ipn/ipnlocal: put DNS suffixes of shared nodes as split DNS routes

Updates #3756
Updates #3767

Co-authored-by: Mihai Parparita <mihai@tailscale.com>
Change-Id: I049ffa7e7dce3d7a7ee4c6aa37f7d4ceefd1ff9d
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

.github/workflows/cross-wasm.yml

@@ -0,0 +1,47 @@
+name: Wasm-Cross
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+    branches:
+      - '*'
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    if: "!contains(github.event.head_commit.message, '[ci skip]')"
+
+    steps:
+
+    - name: Set up Go
+      uses: actions/setup-go@v3
+      with:
+        go-version: 1.18
+      id: go
+
+    - name: Check out code into the Go module directory
+      uses: actions/checkout@v3
+
+    - name: Wasm build CLI and client modules
+      env:
+        GOOS: js
+        GOARCH: wasm
+      run: go build ./cmd/tailscale/cli ./ipn/... ./net/... ./safesocket ./types/... ./wgengine/...
+
+    - uses: k0kubun/action-slack@v2.0.0
+      with:
+        payload: |
+          {
+            "attachments": [{
+              "text": "${{ job.status }}: ${{ github.workflow }} <https://github.com/${{ github.repository }}/commit/${{ github.sha }}/checks|${{ env.COMMIT_DATE }} #${{ env.COMMIT_NUMBER_OF_DAY }}> " +
+                      "(<https://github.com/${{ github.repository }}/commit/${{ github.sha }}|" + "${{ github.sha }}".substring(0, 10) + ">) " +
+                      "of ${{ github.repository }}@" + "${{ github.ref }}".split('/').reverse()[0] + " by ${{ github.event.head_commit.committer.name }}",
+              "color": "danger"
+            }]
+          }
+      env:
+        SLACK_WEBHOOK_URL: ${{ secrets.SLACK_WEBHOOK_URL }}
+      if: failure() && github.event_name == 'push'

.github/workflows/windows-race.yml

@@ -43,6 +43,17 @@ jobs:
         # TODO(raggi): add a go version here.
         key: ${{ runner.os }}-go-2-race-${{ hashFiles('**/go.sum') }}
 
+    - name: Print toolchain details
+      run: gcc -v
+
+    # There is currently an issue in the race detector in Go on Windows when
+    # used with a newer version of GCC.
+    # See https://github.com/tailscale/tailscale/issues/4926.
+    - name: Downgrade MinGW
+      shell: bash
+      run: |
+        choco install mingw --version 10.2.0 --allow-downgrade
+
     - name: Test with -race flag
       # Don't use -bench=. -benchtime=1x.
       # Somewhere in the layers (powershell?)

ALPINE.txt

@@ -0,0 +1 @@
+3.16

Dockerfile

@@ -39,6 +39,18 @@ WORKDIR /go/src/tailscale
 COPY go.mod go.sum ./
 RUN go mod download
 
+# Pre-build some stuff before the following COPY line invalidates the Docker cache.
+RUN go install \
+    github.com/aws/aws-sdk-go-v2/aws \
+    github.com/aws/aws-sdk-go-v2/config \
+    gvisor.dev/gvisor/pkg/tcpip/adapters/gonet \
+    gvisor.dev/gvisor/pkg/tcpip/stack \
+    golang.org/x/crypto/ssh \
+    golang.org/x/crypto/acme \
+    nhooyr.io/websocket \
+    github.com/mdlayher/netlink \
+    golang.zx2c4.com/wireguard/device
+
 COPY . .
 
 # see build_docker.sh
@@ -56,5 +68,7 @@ RUN GOARCH=$TARGETARCH go install -ldflags="\
       -X tailscale.com/version.GitCommit=$VERSION_GIT_HASH" \
       -v ./cmd/tailscale ./cmd/tailscaled
 
-FROM ghcr.io/tailscale/alpine-base:3.14
+FROM alpine:3.16
+RUN apk add --no-cache ca-certificates iptables iproute2 ip6tables
+
 COPY --from=build-env /go/bin/* /usr/local/bin/

Dockerfile.base

@@ -2,5 +2,5 @@
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-FROM alpine:3.15
+FROM alpine:3.16
 RUN apk add --no-cache ca-certificates iptables iproute2 ip6tables

VERSION.txt

@@ -1 +1 @@
-1.23.0
+1.27.0

api.md

@@ -22,9 +22,9 @@ Currently based on {some authentication method}. Visit the [admin panel](https:/
 * **[Tailnets](#tailnet)**
   - ACLs
     - [GET tailnet ACL](#tailnet-acl-get)
-    - [POST tailnet ACL](#tailnet-acl-post): set ACL for a tailnet
-    - [POST tailnet ACL preview](#tailnet-acl-preview-post): preview rule matches on an ACL for a resource
-	- [POST tailnet ACL validate](#tailnet-acl-validate-post): run validation tests against the tailnet's existing ACL
+    - [POST tailnet ACL](#tailnet-acl-post)
+    - [POST tailnet ACL preview](#tailnet-acl-preview-post)
+	- [POST tailnet ACL validate](#tailnet-acl-validate-post)
   - [Devices](#tailnet-devices)
     - [GET tailnet devices](#tailnet-devices-get)
   - [Keys](#tailnet-keys)
@@ -42,12 +42,12 @@ Currently based on {some authentication method}. Visit the [admin panel](https:/
 
 ## Device
 <!-- TODO: description about what devices are -->
-Each Tailscale-connected device has a globally-unique identifier number which we refer as the "deviceID" or sometimes, just "id". 
+Each Tailscale-connected device has a globally-unique identifier number which we refer as the "deviceID" or sometimes, just "id".
 You can use the deviceID to specify operations on a specific device, like retrieving its subnet routes.
 
-To find the deviceID of a particular device, you can use the ["GET /devices"](#getdevices) API call and generate a list of devices on your network. 
+To find the deviceID of a particular device, you can use the ["GET /devices"](#getdevices) API call and generate a list of devices on your network.
 Find the device you're looking for and get the "id" field.
-This is your deviceID. 
+This is your deviceID.
 
 <a name=device-get></a>
 
@@ -60,7 +60,7 @@ Use the `fields` query parameter to explicitly indicate which fields are returne
 ##### Parameters
 ##### Query Parameters
 `fields` - Controls which fields will be included in the returned response.
-Currently, supported options are: 
+Currently, supported options are:
 * `all`: returns all fields in the response.
 * `default`: return all fields except:
   * `enabledRoutes`
@@ -72,7 +72,7 @@ If more than one option is indicated, then the union is used.
 For example, for `fields=default,all`, all fields are returned.
 If the `fields` parameter is not provided, then the default option is used.
 
-##### Example 
+##### Example
 ```
 GET /api/v2/device/12345
 curl 'https://api.tailscale.com/api/v2/device/12345?fields=all' \
@@ -102,10 +102,10 @@ Response
   "nodeKey":"nodekey:user1-node-key",
   "blocksIncomingConnections":false,
   "enabledRoutes":[
-    
+
   ],
   "advertisedRoutes":[
-    
+
   ],
   "clientConnectivity": {
     "endpoints":[
@@ -141,7 +141,7 @@ Response
 <a name=device-delete></a>
 
 #### `DELETE /api/v2/device/:deviceID` - deletes the device from its tailnet
-Deletes the provided device from its tailnet. 
+Deletes the provided device from its tailnet.
 The device must belong to the user's tailnet.
 Deleting shared/external devices is not supported.
 Supply the device of interest in the path using its ID.
@@ -159,7 +159,7 @@ curl -X DELETE 'https://api.tailscale.com/api/v2/device/12345' \
 
 Response
 
-If successful, the response should be empty: 
+If successful, the response should be empty:
 ```
 < HTTP/1.1 200 OK
 ...
@@ -167,7 +167,7 @@ If successful, the response should be empty:
 * Closing connection 0
 ```
 
-If the device is not owned by your tailnet: 
+If the device is not owned by your tailnet:
 ```
 < HTTP/1.1 501 Not Implemented
 ...
@@ -317,14 +317,9 @@ Allows for updating properties on the device key.
 - Provide `false` to enable the device's key expiry. Sets the key to expire at the original expiry time prior to disabling. The key may already have expired. In that case, the device must be re-authenticated.
 - Empty value will not change the key expiry.
 
-`preauthorized`
-
-- If `true`, don't require machine authorization (if enabled on the tailnet)
-
 ```
 {
-  "keyExpiryDisabled": true,
-  "preauthorized": true
+  "keyExpiryDisabled": true
 }
 ```
 
@@ -339,8 +334,8 @@ curl 'https://api.tailscale.com/api/v2/device/11055/key' \
 The response is 2xx on success. The response body is currently an empty JSON
 object.
 
-## Tailnet 
-A tailnet is the name of your Tailscale network. 
+## Tailnet
+A tailnet is the name of your Tailscale network.
 You can find it in the top left corner of the [Admin Panel](https://login.tailscale.com/admin) beside the Tailscale logo.
 
 
@@ -620,7 +615,12 @@ Response:
 
 #### `POST /api/v2/tailnet/:tailnet/acl/validate` - run validation tests against the tailnet's active ACL
 
-Runs the provided ACL tests against the tailnet's existing ACL. This endpoint does not modify the ACL in any way.
+This endpoint works in one of two modes:
+
+1. with a request body that's a JSON array, the body is interpreted as ACL tests to run against the domain's current ACLs.
+2. with a request body that's a JSON object, the body is interpreted as a hypothetical new JSON (HuJSON) body with new ACLs, including any tests.
+
+In either case, this endpoint does not modify the ACL in any way.
 
 ##### Parameters
 
@@ -630,7 +630,7 @@ The POST body should be a JSON formatted array of ACL Tests.
 
 See https://tailscale.com/kb/1018/acls for more information on the format of ACL tests.
 
-##### Example
+##### Example with tests
 ```
 POST /api/v2/tailnet/example.com/acl/validate
 curl 'https://api.tailscale.com/api/v2/tailnet/example.com/acl/validate' \
@@ -641,11 +641,28 @@ curl 'https://api.tailscale.com/api/v2/tailnet/example.com/acl/validate' \
   ]'
 ```
 
-Response:
-If all the tests pass, the response will be empty, with an http status code of 200.
+##### Example with an ACL body
+```
+POST /api/v2/tailnet/example.com/acl/validate
+curl 'https://api.tailscale.com/api/v2/tailnet/example.com/acl/validate' \
+  -u "tskey-yourapikey123:" \
+  --data-binary '
+  {
+    "ACLs": [
+     { "Action": "accept", "src": ["100.105.106.107"], "dst": ["1.2.3.4:*"] },
+    ],
+    "Tests", [
+      {"src": "100.105.106.107", "allow": ["1.2.3.4:80"]}
+    ],
+  }'
+```
+
+Response:
+
+The HTTP status code will be 200 if the request was well formed and there were no server errors, even in the case of failing tests or an invalid ACL. Look at the response body to determine whether there was a problem within your ACL or tests.
+
+If there's a problem, the response body will be a JSON object with a non-empty `message` property and optionally additional details in `data`:
 
-Failed test error response:
-A 400 http status code and the errors in the response body.  
 ```
 {
   "message":"test(s) failed",
@@ -658,6 +675,8 @@ A 400 http status code and the errors in the response body.
 }
 ```
 
+An empty body or a JSON object with no `message` is returned on success.
+
 <a name=tailnet-devices></a>
 
 ### Devices
@@ -665,7 +684,7 @@ A 400 http status code and the errors in the response body.
 <a name=tailnet-devices-get></a>
 
 #### <a name="getdevices"></a> `GET /api/v2/tailnet/:tailnet/devices` - list the devices for a tailnet
-Lists the devices in a tailnet. 
+Lists the devices in a tailnet.
 Supply the tailnet of interest in the path.
 Use the `fields` query parameter to explicitly indicate which fields are returned.
 
@@ -674,7 +693,7 @@ Use the `fields` query parameter to explicitly indicate which fields are returne
 
 ###### Query Parameters
 `fields` - Controls which fields will be included in the returned response.
-Currently, supported options are: 
+Currently, supported options are:
 * `all`: Returns all fields in the response.
 * `default`: return all fields except:
   * `enabledRoutes`
@@ -694,7 +713,7 @@ curl 'https://api.tailscale.com/api/v2/tailnet/example.com/devices' \
   -u "tskey-yourapikey123:"
 ```
 
-Response 
+Response
 ```
 {
   "devices":[
@@ -796,11 +815,15 @@ Supply the tailnet in the path.
 `capabilities` - A mapping of resources to permissible actions.
 ```
 {
-	"capabilities": {
+  "capabilities": {
     "devices": {
       "create": {
         "reusable": false,
-        "ephemeral": false
+        "ephemeral": false,
+        "preauthorized": false,
+        "tags": [
+          "tag:example"
+        ]
       }
     }
   }
@@ -820,11 +843,13 @@ The full key can no longer be retrieved by the server.
 
 ```
 echo '{
-	"capabilities": {
+  "capabilities": {
     "devices": {
       "create": {
         "reusable": false,
-        "ephemeral": false
+        "ephemeral": false,
+        "preauthorized": false,
+        "tags": [ "tag:example" ]
       }
     }
   }
@@ -840,7 +865,7 @@ Response:
 	"key":          "tskey-k123456CNTRL-abcdefghijklmnopqrstuvwxyz",
 	"created":      "2021-12-09T23:22:39Z",
 	"expires":      "2022-03-09T23:22:39Z",
-	"capabilities": {"devices": {"create": {"reusable": false, "ephemeral": false}}}
+	"capabilities": {"devices": {"create": {"reusable": false, "ephemeral": false, "preauthorized": false, "tags": [ "tag:example" ]}}}
 }
 ```
 
@@ -870,10 +895,22 @@ curl 'https://api.tailscale.com/api/v2/tailnet/example.com/keys/k123456CNTRL' \
 Response:
 ```
 {
-	"id":           "k123456CNTRL",
-	"created":      "2021-12-09T22:13:53Z",
-	"expires":      "2022-03-09T22:13:53Z",
-	"capabilities": {"devices": {"create": {"reusable": false, "ephemeral": false}}}
+  "id": "k123456CNTRL",
+  "created": "2022-05-05T18:55:44Z",
+  "expires": "2022-08-03T18:55:44Z",
+  "capabilities": {
+    "devices": {
+      "create": {
+        "reusable": false,
+        "ephemeral": true,
+        "preauthorized": false,
+        "tags": [
+          "tag:bar",
+          "tag:foo"
+        ]
+      }
+    }
+  }
 }
 ```
 
@@ -904,13 +941,13 @@ curl -X DELETE 'https://api.tailscale.com/api/v2/tailnet/example.com/keys/k12345
 <a name=tailnet-dns-nameservers-get></a>
 
 #### `GET /api/v2/tailnet/:tailnet/dns/nameservers` - list the DNS nameservers for a tailnet
-Lists the DNS nameservers for a tailnet. 
+Lists the DNS nameservers for a tailnet.
 Supply the tailnet of interest in the path.
 
 ##### Parameters
 No parameters.
 
-##### Example 
+##### Example
 
 ```
 GET /api/v2/tailnet/example.com/dns/nameservers
@@ -918,7 +955,7 @@ curl 'https://api.tailscale.com/api/v2/tailnet/example.com/dns/nameservers' \
   -u "tskey-yourapikey123:"
 ```
 
-Response 
+Response
 ```
 {
   "dns": ["8.8.8.8"],
@@ -928,7 +965,7 @@ Response
 <a name=tailnet-dns-nameservers-post></a>
 
 #### `POST /api/v2/tailnet/:tailnet/dns/nameservers` - replaces the list of DNS nameservers for a tailnet
-Replaces the list of DNS nameservers for the given tailnet with the list supplied by the user. 
+Replaces the list of DNS nameservers for the given tailnet with the list supplied by the user.
 Supply the tailnet of interest in the path.
 Note that changing the list of DNS nameservers may also affect the status of MagicDNS (if MagicDNS is on).
 
@@ -942,7 +979,7 @@ Note that changing the list of DNS nameservers may also affect the status of Mag
 ```
 
 ##### Returns
-Returns the new list of nameservers and the status of MagicDNS. 
+Returns the new list of nameservers and the status of MagicDNS.
 
 If all nameservers have been removed, MagicDNS will be automatically disabled (until explicitly turned back on by the user).
 
@@ -986,31 +1023,31 @@ Retrieves the DNS preferences that are currently set for the given tailnet.
 Supply the tailnet of interest in the path.
 
 ##### Parameters
-No parameters. 
+No parameters.
 
 ##### Example
 ```
 GET /api/v2/tailnet/example.com/dns/preferences
 curl 'https://api.tailscale.com/api/v2/tailnet/example.com/dns/preferences' \
-  -u "tskey-yourapikey123:" 
+  -u "tskey-yourapikey123:"
 ```
 
 Response:
 ```
 {
-  "magicDNS":false, 
+  "magicDNS":false,
 }
 ```
 
 <a name=tailnet-dns-preferences-post></a>
 
-#### `POST /api/v2/tailnet/:tailnet/dns/preferences` - replaces the DNS preferences for a tailnet 
+#### `POST /api/v2/tailnet/:tailnet/dns/preferences` - replaces the DNS preferences for a tailnet
 Replaces the DNS preferences for a tailnet, specifically, the MagicDNS setting.
-Note that MagicDNS is dependent on DNS servers. 
+Note that MagicDNS is dependent on DNS servers.
 
-If there is at least one DNS server, then MagicDNS can be enabled. 
+If there is at least one DNS server, then MagicDNS can be enabled.
 Otherwise, it returns an error.
-Note that removing all nameservers will turn off MagicDNS. 
+Note that removing all nameservers will turn off MagicDNS.
 To reenable it, nameservers must be added back, and MagicDNS must be explicitly turned on.
 
 ##### Parameters
@@ -1041,7 +1078,7 @@ If there are no DNS servers, it returns an error message:
 }
 ```
 
-If there are DNS servers: 
+If there are DNS servers:
 ```
 {
   "magicDNS":true,
@@ -1050,8 +1087,8 @@ If there are DNS servers:
 
 <a name=tailnet-dns-searchpaths-get></a>
 
-#### `GET /api/v2/tailnet/:tailnet/dns/searchpaths` - retrieves the search paths for a tailnet 
-Retrieves the list of search paths that is currently set for the given tailnet. 
+#### `GET /api/v2/tailnet/:tailnet/dns/searchpaths` - retrieves the search paths for a tailnet
+Retrieves the list of search paths that is currently set for the given tailnet.
 Supply the tailnet of interest in the path.
 
 
@@ -1062,7 +1099,7 @@ No parameters.
 ```
 GET /api/v2/tailnet/example.com/dns/searchpaths
 curl 'https://api.tailscale.com/api/v2/tailnet/example.com/dns/searchpaths' \
-  -u "tskey-yourapikey123:" 
+  -u "tskey-yourapikey123:"
 ```
 
 Response:
@@ -1074,7 +1111,7 @@ Response:
 
 <a name=tailnet-dns-searchpaths-post></a>
 
-#### `POST /api/v2/tailnet/:tailnet/dns/searchpaths` - replaces the search paths for a tailnet 
+#### `POST /api/v2/tailnet/:tailnet/dns/searchpaths` - replaces the search paths for a tailnet
 Replaces the list of searchpaths with the list supplied by the user and returns an error otherwise.
 
 ##### Parameters

build_docker.sh

@@ -25,14 +25,14 @@ export PATH=$PWD/tool:$PATH
 eval $(./build_dist.sh shellvars)
 DEFAULT_TAGS="v${VERSION_SHORT},v${VERSION_MINOR}"
 DEFAULT_REPOS="tailscale/tailscale,ghcr.io/tailscale/tailscale"
-DEFAULT_BASE="ghcr.io/tailscale/alpine-base:3.14"
+DEFAULT_BASE="ghcr.io/tailscale/alpine-base:3.16"
 
 PUSH="${PUSH:-false}"
 REPOS="${REPOS:-${DEFAULT_REPOS}}"
 TAGS="${TAGS:-${DEFAULT_TAGS}}"
 BASE="${BASE:-${DEFAULT_BASE}}"
 
-go run github.com/tailscale/mkctr@latest \
+go run github.com/tailscale/mkctr \
   --gopaths="\
     tailscale.com/cmd/tailscale:/usr/local/bin/tailscale, \
     tailscale.com/cmd/tailscaled:/usr/local/bin/tailscaled" \
@@ -40,7 +40,9 @@ go run github.com/tailscale/mkctr@latest \
     -X tailscale.com/version.Long=${VERSION_LONG} \
     -X tailscale.com/version.Short=${VERSION_SHORT} \
     -X tailscale.com/version.GitCommit=${VERSION_GIT_HASH}" \
+  --files="docs/k8s/run.sh:/tailscale/run.sh" \
   --base="${BASE}" \
   --tags="${TAGS}" \
   --repos="${REPOS}" \
-  --push="${PUSH}"
+  --push="${PUSH}" \
+  /bin/sh /tailscale/run.sh

client/tailscale/acl.go

@@ -0,0 +1,478 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build go1.18
+// +build go1.18
+
+package tailscale
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"inet.af/netaddr"
+)
+
+// ACLRow defines a rule that grants access by a set of users or groups to a set
+// of servers and ports.
+// Only one of Src/Dst or Users/Ports may be specified.
+type ACLRow struct {
+	Action string   `json:"action,omitempty"` // valid values: "accept"
+	Users  []string `json:"users,omitempty"`  // old name for src
+	Ports  []string `json:"ports,omitempty"`  // old name for dst
+	Src    []string `json:"src,omitempty"`
+	Dst    []string `json:"dst,omitempty"`
+}
+
+// ACLTest defines a test for your ACLs to prevent accidental exposure or
+// revoking of access to key servers and ports. Only one of Src or User may be
+// specified, and only one of Allow/Accept may be specified.
+type ACLTest struct {
+	Src    string   `json:"src,omitempty"`    // source
+	User   string   `json:"user,omitempty"`   // old name for source
+	Accept []string `json:"accept,omitempty"` // expected destination ip:port that user can access
+	Deny   []string `json:"deny,omitempty"`   // expected destination ip:port that user cannot access
+
+	Allow []string `json:"allow,omitempty"` // old name for accept
+}
+
+// ACLDetails contains all the details for an ACL.
+type ACLDetails struct {
+	Tests     []ACLTest           `json:"tests,omitempty"`
+	ACLs      []ACLRow            `json:"acls,omitempty"`
+	Groups    map[string][]string `json:"groups,omitempty"`
+	TagOwners map[string][]string `json:"tagowners,omitempty"`
+	Hosts     map[string]string   `json:"hosts,omitempty"`
+}
+
+// ACL contains an ACLDetails and metadata.
+type ACL struct {
+	ACL  ACLDetails
+	ETag string // to check with version on server
+}
+
+// ACLHuJSON contains the HuJSON string of the ACL and metadata.
+type ACLHuJSON struct {
+	ACL      string
+	Warnings []string
+	ETag     string // to check with version on server
+}
+
+// ACL makes a call to the Tailscale server to get a JSON-parsed version of the ACL.
+// The JSON-parsed version of the ACL contains no comments as proper JSON does not support
+// comments.
+func (c *Client) ACL(ctx context.Context) (acl *ACL, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.ACL: %w", err)
+		}
+	}()
+
+	path := fmt.Sprintf("%s/api/v2/tailnet/%s/acl", c.baseURL(), c.tailnet)
+	req, err := http.NewRequestWithContext(ctx, "GET", path, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Accept", "application/json")
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return nil, err
+	}
+
+	// If status code was not successful, return the error.
+	// TODO: Change the check for the StatusCode to include other 2XX success codes.
+	if resp.StatusCode != http.StatusOK {
+		return nil, handleErrorResponse(b, resp)
+	}
+
+	// Otherwise, try to decode the response.
+	var aclDetails ACLDetails
+	if err = json.Unmarshal(b, &aclDetails); err != nil {
+		return nil, err
+	}
+	acl = &ACL{
+		ACL:  aclDetails,
+		ETag: resp.Header.Get("ETag"),
+	}
+	return acl, nil
+}
+
+// ACLHuJSON makes a call to the Tailscale server to get the ACL HuJSON and returns
+// it as a string.
+// HuJSON is JSON with a few modifications to make it more human-friendly. The primary
+// changes are allowing comments and trailing comments. See the following links for more info:
+// https://tailscale.com/kb/1018/acls?q=acl#tailscale-acl-policy-format
+// https://github.com/tailscale/hujson
+func (c *Client) ACLHuJSON(ctx context.Context) (acl *ACLHuJSON, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.ACLHuJSON: %w", err)
+		}
+	}()
+
+	path := fmt.Sprintf("%s/api/v2/tailnet/%s/acl?details=1", c.baseURL(), c.tailnet)
+	req, err := http.NewRequestWithContext(ctx, "GET", path, nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header.Set("Accept", "application/hujson")
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, handleErrorResponse(b, resp)
+	}
+
+	data := struct {
+		ACL      []byte   `json:"acl"`
+		Warnings []string `json:"warnings"`
+	}{}
+	if err := json.Unmarshal(b, &data); err != nil {
+		return nil, err
+	}
+
+	acl = &ACLHuJSON{
+		ACL:      string(data.ACL),
+		Warnings: data.Warnings,
+		ETag:     resp.Header.Get("ETag"),
+	}
+	return acl, nil
+}
+
+// ACLTestFailureSummary specifies a user for which ACL tests
+// failed and the related user-friendly error messages.
+//
+// ACLTestFailureSummary specifies the JSON format sent to the
+// JavaScript client to be rendered in the HTML.
+type ACLTestFailureSummary struct {
+	User   string   `json:"user"`
+	Errors []string `json:"errors"`
+}
+
+// ACLTestError is ErrResponse but with an extra field to account for ACLTestFailureSummary.
+type ACLTestError struct {
+	ErrResponse
+	Data []ACLTestFailureSummary `json:"data"`
+}
+
+func (e ACLTestError) Error() string {
+	return fmt.Sprintf("%s, Data: %+v", e.ErrResponse.Error(), e.Data)
+}
+
+func (c *Client) aclPOSTRequest(ctx context.Context, body []byte, avoidCollisions bool, etag, acceptHeader string) ([]byte, string, error) {
+	path := fmt.Sprintf("%s/api/v2/tailnet/%s/acl", c.baseURL(), c.tailnet)
+	req, err := http.NewRequestWithContext(ctx, "POST", path, bytes.NewBuffer(body))
+	if err != nil {
+		return nil, "", err
+	}
+
+	if avoidCollisions {
+		req.Header.Set("If-Match", etag)
+	}
+	req.Header.Set("Accept", acceptHeader)
+	req.Header.Set("Content-Type", "application/hujson")
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return nil, "", err
+	}
+
+	// If status code was not successful, return the error.
+	// TODO: Change the check for the StatusCode to include other 2XX success codes.
+	if resp.StatusCode != http.StatusOK {
+		// check if test error
+		var ate ACLTestError
+		if err := json.Unmarshal(b, &ate); err != nil {
+			return nil, "", err
+		}
+		ate.Status = resp.StatusCode
+		return nil, "", ate
+	}
+	return b, resp.Header.Get("ETag"), nil
+}
+
+// SetACL sends a POST request to update the ACL according to the provided ACL object. If
+// `avoidCollisions` is true, it will use the ETag obtained in the GET request in an If-Match
+// header to check if the previously obtained ACL was the latest version and that no updates
+// were missed.
+//
+// Returns error with status code 412 if mistmached ETag and avoidCollisions is set to true.
+// Returns error if ACL has tests that fail.
+// Returns error if there are other errors with the ACL.
+func (c *Client) SetACL(ctx context.Context, acl ACL, avoidCollisions bool) (res *ACL, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.SetACL: %w", err)
+		}
+	}()
+	postData, err := json.Marshal(acl.ACL)
+	if err != nil {
+		return nil, err
+	}
+	b, etag, err := c.aclPOSTRequest(ctx, postData, avoidCollisions, acl.ETag, "application/json")
+	if err != nil {
+		return nil, err
+	}
+
+	// Otherwise, try to decode the response.
+	var aclDetails ACLDetails
+	if err = json.Unmarshal(b, &aclDetails); err != nil {
+		return nil, err
+	}
+	res = &ACL{
+		ACL:  aclDetails,
+		ETag: etag,
+	}
+	return res, nil
+}
+
+// SetACLHuJSON sends a POST request to update the ACL according to the provided ACL object. If
+// `avoidCollisions` is true, it will use the ETag obtained in the GET request in an If-Match
+// header to check if the previously obtained ACL was the latest version and that no updates
+// were missed.
+//
+// Returns error with status code 412 if mistmached ETag and avoidCollisions is set to true.
+// Returns error if the HuJSON is invalid.
+// Returns error if ACL has tests that fail.
+// Returns error if there are other errors with the ACL.
+func (c *Client) SetACLHuJSON(ctx context.Context, acl ACLHuJSON, avoidCollisions bool) (res *ACLHuJSON, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.SetACLHuJSON: %w", err)
+		}
+	}()
+
+	postData := []byte(acl.ACL)
+	b, etag, err := c.aclPOSTRequest(ctx, postData, avoidCollisions, acl.ETag, "application/hujson")
+	if err != nil {
+		return nil, err
+	}
+
+	res = &ACLHuJSON{
+		ACL:  string(b),
+		ETag: etag,
+	}
+	return res, nil
+}
+
+// UserRuleMatch specifies the source users/groups/hosts that a rule targets
+// and the destination ports that they can access.
+// LineNumber is only useful for requests provided in HuJSON form.
+// While JSON requests will have LineNumber, the value is not useful.
+type UserRuleMatch struct {
+	Users      []string `json:"users"`
+	Ports      []string `json:"ports"`
+	LineNumber int      `json:"lineNumber"`
+}
+
+// ACLPreviewResponse is the response type of previewACLPostRequest
+type ACLPreviewResponse struct {
+	Matches    []UserRuleMatch `json:"matches"`    // ACL rules that match the specified user or ipport.
+	Type       string          `json:"type"`       // The request type: currently only "user" or "ipport".
+	PreviewFor string          `json:"previewFor"` // A specific user or ipport.
+}
+
+// ACLPreview is the response type of PreviewACLForUser, PreviewACLForIPPort, PreviewACLHuJSONForUser, and PreviewACLHuJSONForIPPort
+type ACLPreview struct {
+	Matches []UserRuleMatch `json:"matches"`
+	User    string          `json:"user,omitempty"`   // Filled if response of PreviewACLForUser or PreviewACLHuJSONForUser
+	IPPort  string          `json:"ipport,omitempty"` // Filled if response of PreviewACLForIPPort or PreviewACLHuJSONForIPPort
+}
+
+func (c *Client) previewACLPostRequest(ctx context.Context, body []byte, previewType string, previewFor string) (res *ACLPreviewResponse, err error) {
+	path := fmt.Sprintf("%s/api/v2/tailnet/%s/acl/preview", c.baseURL(), c.tailnet)
+	req, err := http.NewRequestWithContext(ctx, "POST", path, bytes.NewBuffer(body))
+	if err != nil {
+		return nil, err
+	}
+
+	q := req.URL.Query()
+	q.Add("type", previewType)
+	q.Add("previewFor", previewFor)
+	req.URL.RawQuery = q.Encode()
+
+	req.Header.Set("Content-Type", "application/hujson")
+	c.setAuth(req)
+
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return nil, err
+	}
+
+	// If status code was not successful, return the error.
+	// TODO: Change the check for the StatusCode to include other 2XX success codes.
+	if resp.StatusCode != http.StatusOK {
+		return nil, handleErrorResponse(b, resp)
+	}
+	if err = json.Unmarshal(b, &res); err != nil {
+		return nil, err
+	}
+
+	return res, nil
+}
+
+// PreviewACLForUser determines what rules match a given ACL for a user.
+// The ACL can be a locally modified or clean ACL obtained from server.
+//
+// Returns ACLPreview on success with matches in a slice. If there are no matches,
+// the call is still successful but Matches will be an empty slice.
+// Returns error if the provided ACL is invalid.
+func (c *Client) PreviewACLForUser(ctx context.Context, acl ACL, user string) (res *ACLPreview, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.PreviewACLForUser: %w", err)
+		}
+	}()
+	postData, err := json.Marshal(acl.ACL)
+	if err != nil {
+		return nil, err
+	}
+	b, err := c.previewACLPostRequest(ctx, postData, "user", user)
+	if err != nil {
+		return nil, err
+	}
+
+	return &ACLPreview{
+		Matches: b.Matches,
+		User:    b.PreviewFor,
+	}, nil
+}
+
+// PreviewACLForIPPort determines what rules match a given ACL for a ipport.
+// The ACL can be a locally modified or clean ACL obtained from server.
+//
+// Returns ACLPreview on success with matches in a slice. If there are no matches,
+// the call is still successful but Matches will be an empty slice.
+// Returns error if the provided ACL is invalid.
+func (c *Client) PreviewACLForIPPort(ctx context.Context, acl ACL, ipport netaddr.IPPort) (res *ACLPreview, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.PreviewACLForIPPort: %w", err)
+		}
+	}()
+	postData, err := json.Marshal(acl.ACL)
+	if err != nil {
+		return nil, err
+	}
+	b, err := c.previewACLPostRequest(ctx, postData, "ipport", ipport.String())
+	if err != nil {
+		return nil, err
+	}
+
+	return &ACLPreview{
+		Matches: b.Matches,
+		IPPort:  b.PreviewFor,
+	}, nil
+}
+
+// PreviewACLHuJSONForUser determines what rules match a given ACL for a user.
+// The ACL can be a locally modified or clean ACL obtained from server.
+//
+// Returns ACLPreview on success with matches in a slice. If there are no matches,
+// the call is still successful but Matches will be an empty slice.
+// Returns error if the provided ACL is invalid.
+func (c *Client) PreviewACLHuJSONForUser(ctx context.Context, acl ACLHuJSON, user string) (res *ACLPreview, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.PreviewACLHuJSONForUser: %w", err)
+		}
+	}()
+	postData := []byte(acl.ACL)
+	b, err := c.previewACLPostRequest(ctx, postData, "user", user)
+	if err != nil {
+		return nil, err
+	}
+
+	return &ACLPreview{
+		Matches: b.Matches,
+		User:    b.PreviewFor,
+	}, nil
+}
+
+// PreviewACLHuJSONForIPPort determines what rules match a given ACL for a ipport.
+// The ACL can be a locally modified or clean ACL obtained from server.
+//
+// Returns ACLPreview on success with matches in a slice. If there are no matches,
+// the call is still successful but Matches will be an empty slice.
+// Returns error if the provided ACL is invalid.
+func (c *Client) PreviewACLHuJSONForIPPort(ctx context.Context, acl ACLHuJSON, ipport string) (res *ACLPreview, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.PreviewACLHuJSONForIPPort: %w", err)
+		}
+	}()
+	postData := []byte(acl.ACL)
+	b, err := c.previewACLPostRequest(ctx, postData, "ipport", ipport)
+	if err != nil {
+		return nil, err
+	}
+
+	return &ACLPreview{
+		Matches: b.Matches,
+		IPPort:  b.PreviewFor,
+	}, nil
+}
+
+// ValidateACLJSON takes in the given source and destination (in this situation,
+// it is assumed that you are checking whether the source can connect to destination)
+// and creates an ACLTest from that. It then sends the ACLTest to the control api acl
+// validate endpoint, where the test is run. It returns a nil ACLTestError pointer if
+// no test errors occur.
+func (c *Client) ValidateACLJSON(ctx context.Context, source, dest string) (testErr *ACLTestError, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.ValidateACLJSON: %w", err)
+		}
+	}()
+
+	tests := []ACLTest{ACLTest{User: source, Allow: []string{dest}}}
+	postData, err := json.Marshal(tests)
+	if err != nil {
+		return nil, err
+	}
+
+	path := fmt.Sprintf("%s/api/v2/tailnet/%s/acl/validate", c.baseURL(), c.tailnet)
+	req, err := http.NewRequestWithContext(ctx, "POST", path, bytes.NewBuffer(postData))
+	if err != nil {
+		return nil, err
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	c.setAuth(req)
+
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return nil, err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("control api responsed with %d status code", resp.StatusCode)
+	}
+
+	// The test ran without fail
+	if len(b) == 0 {
+		return nil, nil
+	}
+
+	var res ACLTestError
+	// The test returned errors.
+	if err = json.Unmarshal(b, &res); err != nil {
+		// failed to unmarshal
+		return nil, err
+	}
+	return &res, nil
+}

client/tailscale/apitype/apitype.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Package apitype contains types for the Tailscale local API.
+// Package apitype contains types for the Tailscale local API and control plane API.
 package apitype
 
 import "tailscale.com/tailcfg"
@@ -11,6 +11,9 @@ import "tailscale.com/tailcfg"
 type WhoIsResponse struct {
 	Node        *tailcfg.Node
 	UserProfile *tailcfg.UserProfile
+
+	// Caps are extra capabilities that the remote Node has to this node.
+	Caps []string `json:",omitempty"`
 }
 
 // FileTarget is a node to which files can be sent, and the PeerAPI

client/tailscale/apitype/controltype.go

@@ -0,0 +1,20 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package apitype
+
+type DNSConfig struct {
+	Resolvers         []DNSResolver            `json:"resolvers"`
+	FallbackResolvers []DNSResolver            `json:"fallbackResolvers"`
+	Routes            map[string][]DNSResolver `json:"routes"`
+	Domains           []string                 `json:"domains"`
+	Nameservers       []string                 `json:"nameservers"`
+	Proxied           bool                     `json:"proxied"`
+	PerDomain         bool                     `json:",omitempty"`
+}
+
+type DNSResolver struct {
+	Addr                string   `json:"addr"`
+	BootstrapResolution []string `json:"bootstrapResolution,omitempty"`
+}

client/tailscale/devices.go

@@ -0,0 +1,262 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build go1.18
+// +build go1.18
+
+package tailscale
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"tailscale.com/types/opt"
+)
+
+type GetDevicesResponse struct {
+	Devices []*Device `json:"devices"`
+}
+
+type DerpRegion struct {
+	Preferred           bool    `json:"preferred,omitempty"`
+	LatencyMilliseconds float64 `json:"latencyMs"`
+}
+
+type ClientConnectivity struct {
+	Endpoints             []string `json:"endpoints"`
+	DERP                  string   `json:"derp"`
+	MappingVariesByDestIP opt.Bool `json:"mappingVariesByDestIP"`
+	// DERPLatency is mapped by region name (e.g. "New York City", "Seattle").
+	DERPLatency    map[string]DerpRegion `json:"latency"`
+	ClientSupports map[string]opt.Bool   `json:"clientSupports"`
+}
+
+type Device struct {
+	// Addresses is a list of the devices's Tailscale IP addresses.
+	// It's currently just 1 element, the 100.x.y.z Tailscale IP.
+	Addresses []string `json:"addresses"`
+	DeviceID  string   `json:"id"`
+	User      string   `json:"user"`
+	Name      string   `json:"name"`
+	Hostname  string   `json:"hostname"`
+
+	ClientVersion     string `json:"clientVersion"`   // Empty for external devices.
+	UpdateAvailable   bool   `json:"updateAvailable"` // Empty for external devices.
+	OS                string `json:"os"`
+	Created           string `json:"created"` // Empty for external devices.
+	LastSeen          string `json:"lastSeen"`
+	KeyExpiryDisabled bool   `json:"keyExpiryDisabled"`
+	Expires           string `json:"expires"`
+	Authorized        bool   `json:"authorized"`
+	IsExternal        bool   `json:"isExternal"`
+	MachineKey        string `json:"machineKey"` // Empty for external devices.
+	NodeKey           string `json:"nodeKey"`
+
+	// BlocksIncomingConnections is configured via the device's
+	// Tailscale client preferences. This field is only reported
+	// to the API starting with Tailscale 1.3.x clients.
+	BlocksIncomingConnections bool `json:"blocksIncomingConnections"`
+
+	// The following fields are not included by default:
+
+	// EnabledRoutes are the previously-approved subnet routes
+	// (e.g. "192.168.4.16/24", "10.5.2.4/32").
+	EnabledRoutes []string `json:"enabledRoutes"` // Empty for external devices.
+	// AdvertisedRoutes are the subnets (both enabled and not enabled)
+	// being requested from the node.
+	AdvertisedRoutes []string `json:"advertisedRoutes"` // Empty for external devices.
+
+	ClientConnectivity *ClientConnectivity `json:"clientConnectivity"`
+}
+
+// DeviceFieldsOpts determines which fields should be returned in the response.
+//
+// Please only use DeviceAllFields and DeviceDefaultFields.
+// Other DeviceFieldsOpts are not supported.
+//
+// TODO: Support other DeviceFieldsOpts.
+// In the future, users should be able to create their own DeviceFieldsOpts
+// as valid arguments by setting the fields they want returned to a "non-nil"
+// value. For example, DeviceFieldsOpts{NodeID: "true"} should only return NodeIDs.
+type DeviceFieldsOpts Device
+
+func (d *DeviceFieldsOpts) addFieldsToQueryParameter() string {
+	if d == DeviceDefaultFields || d == nil {
+		return "default"
+	}
+	if d == DeviceAllFields {
+		return "all"
+	}
+
+	return ""
+}
+
+var (
+	DeviceAllFields = &DeviceFieldsOpts{}
+
+	// DeviceDefaultFields specifies that the following fields are returned:
+	//   Addresses, NodeID, User, Name, Hostname, ClientVersion, UpdateAvailable,
+	//   OS, Created, LastSeen, KeyExpiryDisabled, Expires, Authorized, IsExternal
+	//   MachineKey, NodeKey, BlocksIncomingConnections.
+	DeviceDefaultFields = &DeviceFieldsOpts{}
+)
+
+// Devices retrieves the list of devices for a tailnet.
+//
+// See the Device structure for the list of fields hidden for external devices.
+// The optional fields parameter specifies which fields of the devices to return; currently
+// only DeviceDefaultFields (equivalent to nil) and DeviceAllFields are supported.
+// Other values are currently undefined.
+func (c *Client) Devices(ctx context.Context, fields *DeviceFieldsOpts) (deviceList []*Device, err error) {
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.Devices: %w", err)
+		}
+	}()
+
+	path := fmt.Sprintf("%s/api/v2/tailnet/%s/devices", c.baseURL(), c.tailnet)
+	req, err := http.NewRequestWithContext(ctx, "GET", path, nil)
+	if err != nil {
+		return nil, err
+	}
+	// Add fields.
+	fieldStr := fields.addFieldsToQueryParameter()
+	q := req.URL.Query()
+	q.Add("fields", fieldStr)
+	req.URL.RawQuery = q.Encode()
+
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return nil, err
+	}
+	// If status code was not successful, return the error.
+	// TODO: Change the check for the StatusCode to include other 2XX success codes.
+	if resp.StatusCode != http.StatusOK {
+		return nil, handleErrorResponse(b, resp)
+	}
+
+	var devices GetDevicesResponse
+	err = json.Unmarshal(b, &devices)
+	return devices.Devices, err
+}
+
+// Device retrieved the details for a specific device.
+//
+// See the Device structure for the list of fields hidden for an external device.
+// The optional fields parameter specifies which fields of the devices to return; currently
+// only DeviceDefaultFields (equivalent to nil) and DeviceAllFields are supported.
+// Other values are currently undefined.
+func (c *Client) Device(ctx context.Context, deviceID string, fields *DeviceFieldsOpts) (device *Device, err error) {
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.Device: %w", err)
+		}
+	}()
+	path := fmt.Sprintf("%s/api/v2/device/%s", c.baseURL(), deviceID)
+	req, err := http.NewRequestWithContext(ctx, "GET", path, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	// Add fields.
+	fieldStr := fields.addFieldsToQueryParameter()
+	q := req.URL.Query()
+	q.Add("fields", fieldStr)
+	req.URL.RawQuery = q.Encode()
+
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return nil, err
+	}
+	// If status code was not successful, return the error.
+	// TODO: Change the check for the StatusCode to include other 2XX success codes.
+	if resp.StatusCode != http.StatusOK {
+		return nil, handleErrorResponse(b, resp)
+	}
+
+	err = json.Unmarshal(b, &device)
+	return device, err
+}
+
+// DeleteDevice deletes the specified device from the Client's tailnet.
+// NOTE: Only devices that belong to the Client's tailnet can be deleted.
+// Deleting external devices is not supported.
+func (c *Client) DeleteDevice(ctx context.Context, deviceID string) (err error) {
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.DeleteDevice: %w", err)
+		}
+	}()
+
+	path := fmt.Sprintf("%s/api/v2/device/%s", c.baseURL(), url.PathEscape(deviceID))
+	req, err := http.NewRequestWithContext(ctx, "DELETE", path, nil)
+	if err != nil {
+		return err
+	}
+
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return err
+	}
+	// If status code was not successful, return the error.
+	// TODO: Change the check for the StatusCode to include other 2XX success codes.
+	if resp.StatusCode != http.StatusOK {
+		return handleErrorResponse(b, resp)
+	}
+	return nil
+}
+
+// AuthorizeDevice marks a device as authorized.
+func (c *Client) AuthorizeDevice(ctx context.Context, deviceID string) error {
+	path := fmt.Sprintf("%s/api/v2/device/%s/authorized", c.baseURL(), url.PathEscape(deviceID))
+	req, err := http.NewRequestWithContext(ctx, "POST", path, strings.NewReader(`{"authorized":true}`))
+	if err != nil {
+		return err
+	}
+
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return err
+	}
+	// If status code was not successful, return the error.
+	// TODO: Change the check for the StatusCode to include other 2XX success codes.
+	if resp.StatusCode != http.StatusOK {
+		return handleErrorResponse(b, resp)
+	}
+
+	return nil
+}
+
+// SetTags updates the ACL tags on a device.
+func (c *Client) SetTags(ctx context.Context, deviceID string, tags []string) error {
+	params := &struct {
+		Tags []string `json:"tags"`
+	}{Tags: tags}
+	data, err := json.Marshal(params)
+	if err != nil {
+		return err
+	}
+	path := fmt.Sprintf("%s/api/v2/device/%s/tags", c.baseURL(), url.PathEscape(deviceID))
+	req, err := http.NewRequestWithContext(ctx, "POST", path, bytes.NewBuffer(data))
+	if err != nil {
+		return err
+	}
+
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return err
+	}
+	// If status code was not successful, return the error.
+	// TODO: Change the check for the StatusCode to include other 2XX success codes.
+	if resp.StatusCode != http.StatusOK {
+		return handleErrorResponse(b, resp)
+	}
+
+	return nil
+}

client/tailscale/dns.go

@@ -0,0 +1,235 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build go1.18
+// +build go1.18
+
+package tailscale
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"tailscale.com/client/tailscale/apitype"
+)
+
+// DNSNameServers is returned when retrieving the list of nameservers.
+// It is also the structure provided when setting nameservers.
+type DNSNameServers struct {
+	DNS []string `json:"dns"` // DNS name servers
+}
+
+// DNSNameServersPostResponse is returned when setting the list of DNS nameservers.
+//
+// It includes the MagicDNS status since nameservers changes may affect MagicDNS.
+type DNSNameServersPostResponse struct {
+	DNS      []string `json:"dns"`      // DNS name servers
+	MagicDNS bool     `json:"magicDNS"` // whether MagicDNS is active for this tailnet (enabled + has fallback nameservers)
+}
+
+// DNSSearchpaths is the list of search paths for a given domain.
+type DNSSearchPaths struct {
+	SearchPaths []string `json:"searchPaths"` // DNS search paths
+}
+
+// DNSPreferences is the preferences set for a given tailnet.
+//
+// It includes MagicDNS which can be turned on or off. To enable MagicDNS,
+// there must be at least one nameserver. When all nameservers are removed,
+// MagicDNS is disabled.
+type DNSPreferences struct {
+	MagicDNS bool `json:"magicDNS"` // whether MagicDNS is active for this tailnet (enabled + has fallback nameservers)
+}
+
+func (c *Client) dnsGETRequest(ctx context.Context, endpoint string) ([]byte, error) {
+	path := fmt.Sprintf("%s/api/v2/tailnet/%s/dns/%s", c.baseURL(), c.tailnet, endpoint)
+	req, err := http.NewRequestWithContext(ctx, "GET", path, nil)
+	if err != nil {
+		return nil, err
+	}
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return nil, err
+	}
+
+	// If status code was not successful, return the error.
+	// TODO: Change the check for the StatusCode to include other 2XX success codes.
+	if resp.StatusCode != http.StatusOK {
+		return nil, handleErrorResponse(b, resp)
+	}
+
+	return b, nil
+}
+
+func (c *Client) dnsPOSTRequest(ctx context.Context, endpoint string, postData interface{}) ([]byte, error) {
+	path := fmt.Sprintf("%s/api/v2/tailnet/%s/dns/%s", c.baseURL(), c.tailnet, endpoint)
+	data, err := json.Marshal(&postData)
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequestWithContext(ctx, "POST", path, bytes.NewBuffer(data))
+	req.Header.Set("Content-Type", "application/json")
+	if err != nil {
+		return nil, err
+	}
+
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return nil, err
+	}
+
+	// If status code was not successful, return the error.
+	// TODO: Change the check for the StatusCode to include other 2XX success codes.
+	if resp.StatusCode != http.StatusOK {
+		return nil, handleErrorResponse(b, resp)
+	}
+
+	return b, nil
+}
+
+// DNSConfig retrieves the DNSConfig settings for a domain.
+func (c *Client) DNSConfig(ctx context.Context) (cfg *apitype.DNSConfig, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.DNSConfig: %w", err)
+		}
+	}()
+	b, err := c.dnsGETRequest(ctx, "config")
+	if err != nil {
+		return nil, err
+	}
+	var dnsResp apitype.DNSConfig
+	err = json.Unmarshal(b, &dnsResp)
+	return &dnsResp, err
+}
+
+func (c *Client) SetDNSConfig(ctx context.Context, cfg apitype.DNSConfig) (resp *apitype.DNSConfig, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.SetDNSConfig: %w", err)
+		}
+	}()
+	var dnsResp apitype.DNSConfig
+	b, err := c.dnsPOSTRequest(ctx, "config", cfg)
+	if err != nil {
+		return nil, err
+	}
+	err = json.Unmarshal(b, &dnsResp)
+	return &dnsResp, err
+}
+
+// NameServers retrieves the list of nameservers set for a domain.
+func (c *Client) NameServers(ctx context.Context) (nameservers []string, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.NameServers: %w", err)
+		}
+	}()
+	b, err := c.dnsGETRequest(ctx, "nameservers")
+	if err != nil {
+		return nil, err
+	}
+	var dnsResp DNSNameServers
+	err = json.Unmarshal(b, &dnsResp)
+	return dnsResp.DNS, err
+}
+
+// SetNameServers sets the list of nameservers for a tailnet to the list provided
+// by the user.
+//
+// It returns the new list of nameservers and the MagicDNS status in case it was
+// affected by the change. For example, removing all nameservers will turn off
+// MagicDNS.
+func (c *Client) SetNameServers(ctx context.Context, nameservers []string) (dnsResp *DNSNameServersPostResponse, err error) {
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.SetNameServers: %w", err)
+		}
+	}()
+	dnsReq := DNSNameServers{DNS: nameservers}
+	b, err := c.dnsPOSTRequest(ctx, "nameservers", dnsReq)
+	if err != nil {
+		return nil, err
+	}
+	err = json.Unmarshal(b, &dnsResp)
+	return dnsResp, err
+}
+
+// DNSPreferences retrieves the DNS preferences set for a tailnet.
+//
+// It returns the status of MagicDNS.
+func (c *Client) DNSPreferences(ctx context.Context) (dnsResp *DNSPreferences, err error) {
+	// Format return errors to be descriptive.
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.DNSPreferences: %w", err)
+		}
+	}()
+	b, err := c.dnsGETRequest(ctx, "preferences")
+	if err != nil {
+		return nil, err
+	}
+	err = json.Unmarshal(b, &dnsResp)
+	return dnsResp, err
+}
+
+// SetDNSPreferences sets the DNS preferences for a tailnet.
+//
+// MagicDNS can only be enabled when there is at least one nameserver provided.
+// When all nameservers are removed, MagicDNS is disabled and will stay disabled,
+// unless explicitly enabled by a user again.
+func (c *Client) SetDNSPreferences(ctx context.Context, magicDNS bool) (dnsResp *DNSPreferences, err error) {
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.SetDNSPreferences: %w", err)
+		}
+	}()
+	dnsReq := DNSPreferences{MagicDNS: magicDNS}
+	b, err := c.dnsPOSTRequest(ctx, "preferences", dnsReq)
+	if err != nil {
+		return
+	}
+	err = json.Unmarshal(b, &dnsResp)
+	return dnsResp, err
+}
+
+// SearchPaths retrieves the list of searchpaths set for a tailnet.
+func (c *Client) SearchPaths(ctx context.Context) (searchpaths []string, err error) {
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.SearchPaths: %w", err)
+		}
+	}()
+	b, err := c.dnsGETRequest(ctx, "searchpaths")
+	if err != nil {
+		return nil, err
+	}
+	var dnsResp *DNSSearchPaths
+	err = json.Unmarshal(b, &dnsResp)
+	return dnsResp.SearchPaths, err
+}
+
+// SetSearchPaths sets the list of searchpaths for a tailnet.
+func (c *Client) SetSearchPaths(ctx context.Context, searchpaths []string) (newSearchPaths []string, err error) {
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.SetSearchPaths: %w", err)
+		}
+	}()
+	dnsReq := DNSSearchPaths{SearchPaths: searchpaths}
+	b, err := c.dnsPOSTRequest(ctx, "searchpaths", dnsReq)
+	if err != nil {
+		return nil, err
+	}
+	var dnsResp DNSSearchPaths
+	err = json.Unmarshal(b, &dnsResp)
+	return dnsResp.SearchPaths, err
+}

client/tailscale/localclient.go

@@ -0,0 +1,711 @@
+// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build go1.18
+// +build go1.18
+
+package tailscale
+
+import (
+	"bytes"
+	"context"
+	"crypto/tls"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net"
+	"net/http"
+	"net/http/httptrace"
+	"net/url"
+	"os/exec"
+	"runtime"
+	"strconv"
+	"strings"
+	"sync"
+	"time"
+
+	"go4.org/mem"
+	"inet.af/netaddr"
+	"tailscale.com/client/tailscale/apitype"
+	"tailscale.com/ipn"
+	"tailscale.com/ipn/ipnstate"
+	"tailscale.com/net/netutil"
+	"tailscale.com/paths"
+	"tailscale.com/safesocket"
+	"tailscale.com/tailcfg"
+)
+
+// defaultLocalClient is the default LocalClient when using the legacy
+// package-level functions.
+var defaultLocalClient LocalClient
+
+// LocalClient is a client to Tailscale's "local API", communicating with the
+// Tailscale daemon on the local machine. Its API is not necessarily stable and
+// subject to changes between releases. Some API calls have stricter
+// compatibility guarantees, once they've been widely adopted. See method docs
+// for details.
+//
+// Its zero value is valid to use.
+//
+// Any exported fields should be set before using methods on the type
+// and not changed thereafter.
+type LocalClient struct {
+	// Dial optionally specifies an alternate func that connects to the local
+	// machine's tailscaled or equivalent. If nil, a default is used.
+	Dial func(ctx context.Context, network, addr string) (net.Conn, error)
+
+	// Socket specifies an alternate path to the local Tailscale socket.
+	// If empty, a platform-specific default is used.
+	Socket string
+
+	// UseSocketOnly, if true, tries to only connect to tailscaled via the
+	// Unix socket and not via fallback mechanisms as done on macOS when
+	// connecting to the GUI client variants.
+	UseSocketOnly bool
+
+	// tsClient does HTTP requests to the local Tailscale daemon.
+	// It's lazily initialized on first use.
+	tsClient     *http.Client
+	tsClientOnce sync.Once
+}
+
+func (lc *LocalClient) socket() string {
+	if lc.Socket != "" {
+		return lc.Socket
+	}
+	return paths.DefaultTailscaledSocket()
+}
+
+func (lc *LocalClient) dialer() func(ctx context.Context, network, addr string) (net.Conn, error) {
+	if lc.Dial != nil {
+		return lc.Dial
+	}
+	return lc.defaultDialer
+}
+
+func (lc *LocalClient) defaultDialer(ctx context.Context, network, addr string) (net.Conn, error) {
+	if addr != "local-tailscaled.sock:80" {
+		return nil, fmt.Errorf("unexpected URL address %q", addr)
+	}
+	if !lc.UseSocketOnly {
+		// On macOS, when dialing from non-sandboxed program to sandboxed GUI running
+		// a TCP server on a random port, find the random port. For HTTP connections,
+		// we don't send the token. It gets added in an HTTP Basic-Auth header.
+		if port, _, err := safesocket.LocalTCPPortAndToken(); err == nil {
+			var d net.Dialer
+			return d.DialContext(ctx, "tcp", "localhost:"+strconv.Itoa(port))
+		}
+	}
+	s := safesocket.DefaultConnectionStrategy(lc.socket())
+	// The user provided a non-default tailscaled socket address.
+	// Connect only to exactly what they provided.
+	s.UseFallback(false)
+	return safesocket.Connect(s)
+}
+
+// DoLocalRequest makes an HTTP request to the local machine's Tailscale daemon.
+//
+// URLs are of the form http://local-tailscaled.sock/localapi/v0/whois?ip=1.2.3.4.
+//
+// The hostname must be "local-tailscaled.sock", even though it
+// doesn't actually do any DNS lookup. The actual means of connecting to and
+// authenticating to the local Tailscale daemon vary by platform.
+//
+// DoLocalRequest may mutate the request to add Authorization headers.
+func (lc *LocalClient) DoLocalRequest(req *http.Request) (*http.Response, error) {
+	lc.tsClientOnce.Do(func() {
+		lc.tsClient = &http.Client{
+			Transport: &http.Transport{
+				DialContext: lc.dialer(),
+			},
+		}
+	})
+	if _, token, err := safesocket.LocalTCPPortAndToken(); err == nil {
+		req.SetBasicAuth("", token)
+	}
+	return lc.tsClient.Do(req)
+}
+
+func (lc *LocalClient) doLocalRequestNiceError(req *http.Request) (*http.Response, error) {
+	res, err := lc.DoLocalRequest(req)
+	if err == nil {
+		if server := res.Header.Get("Tailscale-Version"); server != "" && server != ipn.IPCVersion() && onVersionMismatch != nil {
+			onVersionMismatch(ipn.IPCVersion(), server)
+		}
+		if res.StatusCode == 403 {
+			all, _ := ioutil.ReadAll(res.Body)
+			return nil, &AccessDeniedError{errors.New(errorMessageFromBody(all))}
+		}
+		return res, nil
+	}
+	if ue, ok := err.(*url.Error); ok {
+		if oe, ok := ue.Err.(*net.OpError); ok && oe.Op == "dial" {
+			path := req.URL.Path
+			pathPrefix, _, _ := strings.Cut(path, "?")
+			return nil, fmt.Errorf("Failed to connect to local Tailscale daemon for %s; %s Error: %w", pathPrefix, tailscaledConnectHint(), oe)
+		}
+	}
+	return nil, err
+}
+
+type errorJSON struct {
+	Error string
+}
+
+// AccessDeniedError is an error due to permissions.
+type AccessDeniedError struct {
+	err error
+}
+
+func (e *AccessDeniedError) Error() string { return fmt.Sprintf("Access denied: %v", e.err) }
+func (e *AccessDeniedError) Unwrap() error { return e.err }
+
+// IsAccessDeniedError reports whether err is or wraps an AccessDeniedError.
+func IsAccessDeniedError(err error) bool {
+	var ae *AccessDeniedError
+	return errors.As(err, &ae)
+}
+
+// bestError returns either err, or if body contains a valid JSON
+// object of type errorJSON, its non-empty error body.
+func bestError(err error, body []byte) error {
+	var j errorJSON
+	if err := json.Unmarshal(body, &j); err == nil && j.Error != "" {
+		return errors.New(j.Error)
+	}
+	return err
+}
+
+func errorMessageFromBody(body []byte) string {
+	var j errorJSON
+	if err := json.Unmarshal(body, &j); err == nil && j.Error != "" {
+		return j.Error
+	}
+	return strings.TrimSpace(string(body))
+}
+
+var onVersionMismatch func(clientVer, serverVer string)
+
+// SetVersionMismatchHandler sets f as the version mismatch handler
+// to be called when the client (the current process) has a version
+// number that doesn't match the server's declared version.
+func SetVersionMismatchHandler(f func(clientVer, serverVer string)) {
+	onVersionMismatch = f
+}
+
+func (lc *LocalClient) send(ctx context.Context, method, path string, wantStatus int, body io.Reader) ([]byte, error) {
+	req, err := http.NewRequestWithContext(ctx, method, "http://local-tailscaled.sock"+path, body)
+	if err != nil {
+		return nil, err
+	}
+	res, err := lc.doLocalRequestNiceError(req)
+	if err != nil {
+		return nil, err
+	}
+	defer res.Body.Close()
+	slurp, err := ioutil.ReadAll(res.Body)
+	if err != nil {
+		return nil, err
+	}
+	if res.StatusCode != wantStatus {
+		err = fmt.Errorf("%v: %s", res.Status, bytes.TrimSpace(slurp))
+		return nil, bestError(err, slurp)
+	}
+	return slurp, nil
+}
+
+func (lc *LocalClient) get200(ctx context.Context, path string) ([]byte, error) {
+	return lc.send(ctx, "GET", path, 200, nil)
+}
+
+// WhoIs returns the owner of the remoteAddr, which must be an IP or IP:port.
+//
+// Deprecated: use LocalClient.WhoIs.
+func WhoIs(ctx context.Context, remoteAddr string) (*apitype.WhoIsResponse, error) {
+	return defaultLocalClient.WhoIs(ctx, remoteAddr)
+}
+
+// WhoIs returns the owner of the remoteAddr, which must be an IP or IP:port.
+func (lc *LocalClient) WhoIs(ctx context.Context, remoteAddr string) (*apitype.WhoIsResponse, error) {
+	body, err := lc.get200(ctx, "/localapi/v0/whois?addr="+url.QueryEscape(remoteAddr))
+	if err != nil {
+		return nil, err
+	}
+	r := new(apitype.WhoIsResponse)
+	if err := json.Unmarshal(body, r); err != nil {
+		if max := 200; len(body) > max {
+			body = append(body[:max], "..."...)
+		}
+		return nil, fmt.Errorf("failed to parse JSON WhoIsResponse from %q", body)
+	}
+	return r, nil
+}
+
+// Goroutines returns a dump of the Tailscale daemon's current goroutines.
+func (lc *LocalClient) Goroutines(ctx context.Context) ([]byte, error) {
+	return lc.get200(ctx, "/localapi/v0/goroutines")
+}
+
+// DaemonMetrics returns the Tailscale daemon's metrics in
+// the Prometheus text exposition format.
+func (lc *LocalClient) DaemonMetrics(ctx context.Context) ([]byte, error) {
+	return lc.get200(ctx, "/localapi/v0/metrics")
+}
+
+// Profile returns a pprof profile of the Tailscale daemon.
+func (lc *LocalClient) Profile(ctx context.Context, pprofType string, sec int) ([]byte, error) {
+	var secArg string
+	if sec < 0 || sec > 300 {
+		return nil, errors.New("duration out of range")
+	}
+	if sec != 0 || pprofType == "profile" {
+		secArg = fmt.Sprint(sec)
+	}
+	return lc.get200(ctx, fmt.Sprintf("/localapi/v0/profile?name=%s&seconds=%v", url.QueryEscape(pprofType), secArg))
+}
+
+// BugReport logs and returns a log marker that can be shared by the user with support.
+func (lc *LocalClient) BugReport(ctx context.Context, note string) (string, error) {
+	body, err := lc.send(ctx, "POST", "/localapi/v0/bugreport?note="+url.QueryEscape(note), 200, nil)
+	if err != nil {
+		return "", err
+	}
+	return strings.TrimSpace(string(body)), nil
+}
+
+// DebugAction invokes a debug action, such as "rebind" or "restun".
+// These are development tools and subject to change or removal over time.
+func (lc *LocalClient) DebugAction(ctx context.Context, action string) error {
+	body, err := lc.send(ctx, "POST", "/localapi/v0/debug?action="+url.QueryEscape(action), 200, nil)
+	if err != nil {
+		return fmt.Errorf("error %w: %s", err, body)
+	}
+	return nil
+}
+
+// Status returns the Tailscale daemon's status.
+func Status(ctx context.Context) (*ipnstate.Status, error) {
+	return defaultLocalClient.Status(ctx)
+}
+
+// Status returns the Tailscale daemon's status.
+func (lc *LocalClient) Status(ctx context.Context) (*ipnstate.Status, error) {
+	return lc.status(ctx, "")
+}
+
+// StatusWithoutPeers returns the Tailscale daemon's status, without the peer info.
+func StatusWithoutPeers(ctx context.Context) (*ipnstate.Status, error) {
+	return defaultLocalClient.StatusWithoutPeers(ctx)
+}
+
+// StatusWithoutPeers returns the Tailscale daemon's status, without the peer info.
+func (lc *LocalClient) StatusWithoutPeers(ctx context.Context) (*ipnstate.Status, error) {
+	return lc.status(ctx, "?peers=false")
+}
+
+func (lc *LocalClient) status(ctx context.Context, queryString string) (*ipnstate.Status, error) {
+	body, err := lc.get200(ctx, "/localapi/v0/status"+queryString)
+	if err != nil {
+		return nil, err
+	}
+	st := new(ipnstate.Status)
+	if err := json.Unmarshal(body, st); err != nil {
+		return nil, err
+	}
+	return st, nil
+}
+
+// IDToken is a request to get an OIDC ID token for an audience.
+// The token can be presented to any resource provider which offers OIDC
+// Federation.
+func (lc *LocalClient) IDToken(ctx context.Context, aud string) (*tailcfg.TokenResponse, error) {
+	body, err := lc.get200(ctx, "/localapi/v0/id-token?aud="+url.QueryEscape(aud))
+	if err != nil {
+		return nil, err
+	}
+	tr := new(tailcfg.TokenResponse)
+	if err := json.Unmarshal(body, tr); err != nil {
+		return nil, err
+	}
+	return tr, nil
+}
+
+func (lc *LocalClient) WaitingFiles(ctx context.Context) ([]apitype.WaitingFile, error) {
+	body, err := lc.get200(ctx, "/localapi/v0/files/")
+	if err != nil {
+		return nil, err
+	}
+	var wfs []apitype.WaitingFile
+	if err := json.Unmarshal(body, &wfs); err != nil {
+		return nil, err
+	}
+	return wfs, nil
+}
+
+func (lc *LocalClient) DeleteWaitingFile(ctx context.Context, baseName string) error {
+	_, err := lc.send(ctx, "DELETE", "/localapi/v0/files/"+url.PathEscape(baseName), http.StatusNoContent, nil)
+	return err
+}
+
+func (lc *LocalClient) GetWaitingFile(ctx context.Context, baseName string) (rc io.ReadCloser, size int64, err error) {
+	req, err := http.NewRequestWithContext(ctx, "GET", "http://local-tailscaled.sock/localapi/v0/files/"+url.PathEscape(baseName), nil)
+	if err != nil {
+		return nil, 0, err
+	}
+	res, err := lc.doLocalRequestNiceError(req)
+	if err != nil {
+		return nil, 0, err
+	}
+	if res.ContentLength == -1 {
+		res.Body.Close()
+		return nil, 0, fmt.Errorf("unexpected chunking")
+	}
+	if res.StatusCode != 200 {
+		body, _ := ioutil.ReadAll(res.Body)
+		res.Body.Close()
+		return nil, 0, fmt.Errorf("HTTP %s: %s", res.Status, body)
+	}
+	return res.Body, res.ContentLength, nil
+}
+
+func (lc *LocalClient) FileTargets(ctx context.Context) ([]apitype.FileTarget, error) {
+	body, err := lc.get200(ctx, "/localapi/v0/file-targets")
+	if err != nil {
+		return nil, err
+	}
+	var fts []apitype.FileTarget
+	if err := json.Unmarshal(body, &fts); err != nil {
+		return nil, fmt.Errorf("invalid JSON: %w", err)
+	}
+	return fts, nil
+}
+
+// PushFile sends Taildrop file r to target.
+//
+// A size of -1 means unknown.
+// The name parameter is the original filename, not escaped.
+func (lc *LocalClient) PushFile(ctx context.Context, target tailcfg.StableNodeID, size int64, name string, r io.Reader) error {
+	req, err := http.NewRequestWithContext(ctx, "PUT", "http://local-tailscaled.sock/localapi/v0/file-put/"+string(target)+"/"+url.PathEscape(name), r)
+	if err != nil {
+		return err
+	}
+	if size != -1 {
+		req.ContentLength = size
+	}
+	res, err := lc.doLocalRequestNiceError(req)
+	if err != nil {
+		return err
+	}
+	if res.StatusCode == 200 {
+		io.Copy(io.Discard, res.Body)
+		return nil
+	}
+	all, _ := io.ReadAll(res.Body)
+	return bestError(fmt.Errorf("%s: %s", res.Status, all), all)
+}
+
+// CheckIPForwarding asks the local Tailscale daemon whether it looks like the
+// machine is properly configured to forward IP packets as a subnet router
+// or exit node.
+func (lc *LocalClient) CheckIPForwarding(ctx context.Context) error {
+	body, err := lc.get200(ctx, "/localapi/v0/check-ip-forwarding")
+	if err != nil {
+		return err
+	}
+	var jres struct {
+		Warning string
+	}
+	if err := json.Unmarshal(body, &jres); err != nil {
+		return fmt.Errorf("invalid JSON from check-ip-forwarding: %w", err)
+	}
+	if jres.Warning != "" {
+		return errors.New(jres.Warning)
+	}
+	return nil
+}
+
+// CheckPrefs validates the provided preferences, without making any changes.
+//
+// The CLI uses this before a Start call to fail fast if the preferences won't
+// work. Currently (2022-04-18) this only checks for SSH server compatibility.
+// Note that EditPrefs does the same validation as this, so call CheckPrefs before
+// EditPrefs is not necessary.
+func (lc *LocalClient) CheckPrefs(ctx context.Context, p *ipn.Prefs) error {
+	pj, err := json.Marshal(p)
+	if err != nil {
+		return err
+	}
+	_, err = lc.send(ctx, "POST", "/localapi/v0/check-prefs", http.StatusOK, bytes.NewReader(pj))
+	return err
+}
+
+func (lc *LocalClient) GetPrefs(ctx context.Context) (*ipn.Prefs, error) {
+	body, err := lc.get200(ctx, "/localapi/v0/prefs")
+	if err != nil {
+		return nil, err
+	}
+	var p ipn.Prefs
+	if err := json.Unmarshal(body, &p); err != nil {
+		return nil, fmt.Errorf("invalid prefs JSON: %w", err)
+	}
+	return &p, nil
+}
+
+func (lc *LocalClient) EditPrefs(ctx context.Context, mp *ipn.MaskedPrefs) (*ipn.Prefs, error) {
+	mpj, err := json.Marshal(mp)
+	if err != nil {
+		return nil, err
+	}
+	body, err := lc.send(ctx, "PATCH", "/localapi/v0/prefs", http.StatusOK, bytes.NewReader(mpj))
+	if err != nil {
+		return nil, err
+	}
+	var p ipn.Prefs
+	if err := json.Unmarshal(body, &p); err != nil {
+		return nil, fmt.Errorf("invalid prefs JSON: %w", err)
+	}
+	return &p, nil
+}
+
+func (lc *LocalClient) Logout(ctx context.Context) error {
+	_, err := lc.send(ctx, "POST", "/localapi/v0/logout", http.StatusNoContent, nil)
+	return err
+}
+
+// SetDNS adds a DNS TXT record for the given domain name, containing
+// the provided TXT value. The intended use case is answering
+// LetsEncrypt/ACME dns-01 challenges.
+//
+// The control plane will only permit SetDNS requests with very
+// specific names and values. The name should be
+// "_acme-challenge." + your node's MagicDNS name. It's expected that
+// clients cache the certs from LetsEncrypt (or whichever CA is
+// providing them) and only request new ones as needed; the control plane
+// rate limits SetDNS requests.
+//
+// This is a low-level interface; it's expected that most Tailscale
+// users use a higher level interface to getting/using TLS
+// certificates.
+func (lc *LocalClient) SetDNS(ctx context.Context, name, value string) error {
+	v := url.Values{}
+	v.Set("name", name)
+	v.Set("value", value)
+	_, err := lc.send(ctx, "POST", "/localapi/v0/set-dns?"+v.Encode(), 200, nil)
+	return err
+}
+
+// DialTCP connects to the host's port via Tailscale.
+//
+// The host may be a base DNS name (resolved from the netmap inside
+// tailscaled), a FQDN, or an IP address.
+//
+// The ctx is only used for the duration of the call, not the lifetime of the net.Conn.
+func (lc *LocalClient) DialTCP(ctx context.Context, host string, port uint16) (net.Conn, error) {
+	connCh := make(chan net.Conn, 1)
+	trace := httptrace.ClientTrace{
+		GotConn: func(info httptrace.GotConnInfo) {
+			connCh <- info.Conn
+		},
+	}
+	ctx = httptrace.WithClientTrace(ctx, &trace)
+	req, err := http.NewRequestWithContext(ctx, "POST", "http://local-tailscaled.sock/localapi/v0/dial", nil)
+	if err != nil {
+		return nil, err
+	}
+	req.Header = http.Header{
+		"Upgrade":    []string{"ts-dial"},
+		"Connection": []string{"upgrade"},
+		"Dial-Host":  []string{host},
+		"Dial-Port":  []string{fmt.Sprint(port)},
+	}
+	res, err := lc.DoLocalRequest(req)
+	if err != nil {
+		return nil, err
+	}
+	if res.StatusCode != http.StatusSwitchingProtocols {
+		body, _ := io.ReadAll(res.Body)
+		res.Body.Close()
+		return nil, fmt.Errorf("unexpected HTTP response: %s, %s", res.Status, body)
+	}
+	// From here on, the underlying net.Conn is ours to use, but there
+	// is still a read buffer attached to it within resp.Body. So, we
+	// must direct I/O through resp.Body, but we can still use the
+	// underlying net.Conn for stuff like deadlines.
+	var switchedConn net.Conn
+	select {
+	case switchedConn = <-connCh:
+	default:
+	}
+	if switchedConn == nil {
+		res.Body.Close()
+		return nil, fmt.Errorf("httptrace didn't provide a connection")
+	}
+	rwc, ok := res.Body.(io.ReadWriteCloser)
+	if !ok {
+		res.Body.Close()
+		return nil, errors.New("http Transport did not provide a writable body")
+	}
+	return netutil.NewAltReadWriteCloserConn(rwc, switchedConn), nil
+}
+
+// CurrentDERPMap returns the current DERPMap that is being used by the local tailscaled.
+// It is intended to be used with netcheck to see availability of DERPs.
+func (lc *LocalClient) CurrentDERPMap(ctx context.Context) (*tailcfg.DERPMap, error) {
+	var derpMap tailcfg.DERPMap
+	res, err := lc.send(ctx, "GET", "/localapi/v0/derpmap", 200, nil)
+	if err != nil {
+		return nil, err
+	}
+	if err = json.Unmarshal(res, &derpMap); err != nil {
+		return nil, fmt.Errorf("invalid derp map json: %w", err)
+	}
+	return &derpMap, nil
+}
+
+// CertPair returns a cert and private key for the provided DNS domain.
+//
+// It returns a cached certificate from disk if it's still valid.
+//
+// Deprecated: use LocalClient.CertPair.
+func CertPair(ctx context.Context, domain string) (certPEM, keyPEM []byte, err error) {
+	return defaultLocalClient.CertPair(ctx, domain)
+}
+
+// CertPair returns a cert and private key for the provided DNS domain.
+//
+// It returns a cached certificate from disk if it's still valid.
+//
+// API maturity: this is considered a stable API.
+func (lc *LocalClient) CertPair(ctx context.Context, domain string) (certPEM, keyPEM []byte, err error) {
+	res, err := lc.send(ctx, "GET", "/localapi/v0/cert/"+domain+"?type=pair", 200, nil)
+	if err != nil {
+		return nil, nil, err
+	}
+	// with ?type=pair, the response PEM is first the one private
+	// key PEM block, then the cert PEM blocks.
+	i := mem.Index(mem.B(res), mem.S("--\n--"))
+	if i == -1 {
+		return nil, nil, fmt.Errorf("unexpected output: no delimiter")
+	}
+	i += len("--\n")
+	keyPEM, certPEM = res[:i], res[i:]
+	if mem.Contains(mem.B(certPEM), mem.S(" PRIVATE KEY-----")) {
+		return nil, nil, fmt.Errorf("unexpected output: key in cert")
+	}
+	return certPEM, keyPEM, nil
+}
+
+// GetCertificate fetches a TLS certificate for the TLS ClientHello in hi.
+//
+// It returns a cached certificate from disk if it's still valid.
+//
+// It's the right signature to use as the value of
+// tls.Config.GetCertificate.
+//
+// Deprecated: use LocalClient.GetCertificate.
+func GetCertificate(hi *tls.ClientHelloInfo) (*tls.Certificate, error) {
+	return defaultLocalClient.GetCertificate(hi)
+}
+
+// GetCertificate fetches a TLS certificate for the TLS ClientHello in hi.
+//
+// It returns a cached certificate from disk if it's still valid.
+//
+// It's the right signature to use as the value of
+// tls.Config.GetCertificate.
+//
+// API maturity: this is considered a stable API.
+func (lc *LocalClient) GetCertificate(hi *tls.ClientHelloInfo) (*tls.Certificate, error) {
+	if hi == nil || hi.ServerName == "" {
+		return nil, errors.New("no SNI ServerName")
+	}
+	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
+	defer cancel()
+
+	name := hi.ServerName
+	if !strings.Contains(name, ".") {
+		if v, ok := lc.ExpandSNIName(ctx, name); ok {
+			name = v
+		}
+	}
+	certPEM, keyPEM, err := lc.CertPair(ctx, name)
+	if err != nil {
+		return nil, err
+	}
+	cert, err := tls.X509KeyPair(certPEM, keyPEM)
+	if err != nil {
+		return nil, err
+	}
+	return &cert, nil
+}
+
+// ExpandSNIName expands bare label name into the the most likely actual TLS cert name.
+//
+// Deprecated: use LocalClient.ExpandSNIName.
+func ExpandSNIName(ctx context.Context, name string) (fqdn string, ok bool) {
+	return defaultLocalClient.ExpandSNIName(ctx, name)
+}
+
+// ExpandSNIName expands bare label name into the the most likely actual TLS cert name.
+func (lc *LocalClient) ExpandSNIName(ctx context.Context, name string) (fqdn string, ok bool) {
+	st, err := lc.StatusWithoutPeers(ctx)
+	if err != nil {
+		return "", false
+	}
+	for _, d := range st.CertDomains {
+		if len(d) > len(name)+1 && strings.HasPrefix(d, name) && d[len(name)] == '.' {
+			return d, true
+		}
+	}
+	return "", false
+}
+
+// Ping sends a ping of the provided type to the provided IP and waits
+// for its response.
+func (lc *LocalClient) Ping(ctx context.Context, ip netaddr.IP, pingtype tailcfg.PingType) (*ipnstate.PingResult, error) {
+	v := url.Values{}
+	v.Set("ip", ip.String())
+	v.Set("type", string(pingtype))
+	body, err := lc.send(ctx, "POST", "/localapi/v0/ping?"+v.Encode(), 200, nil)
+	if err != nil {
+		return nil, fmt.Errorf("error %w: %s", err, body)
+	}
+	pr := new(ipnstate.PingResult)
+	if err := json.Unmarshal(body, pr); err != nil {
+		return nil, err
+	}
+	return pr, nil
+}
+
+// tailscaledConnectHint gives a little thing about why tailscaled (or
+// platform equivalent) is not answering localapi connections.
+//
+// It ends in a punctuation. See caller.
+func tailscaledConnectHint() string {
+	if runtime.GOOS != "linux" {
+		// TODO(bradfitz): flesh this out
+		return "not running?"
+	}
+	out, err := exec.Command("systemctl", "show", "tailscaled.service", "--no-page", "--property", "LoadState,ActiveState,SubState").Output()
+	if err != nil {
+		return "not running?"
+	}
+	// Parse:
+	// LoadState=loaded
+	// ActiveState=inactive
+	// SubState=dead
+	st := map[string]string{}
+	for _, line := range strings.Split(string(out), "\n") {
+		if k, v, ok := strings.Cut(line, "="); ok {
+			st[k] = strings.TrimSpace(v)
+		}
+	}
+	if st["LoadState"] == "loaded" &&
+		(st["SubState"] != "running" || st["ActiveState"] != "active") {
+		return "systemd tailscaled.service not running."
+	}
+	return "not running?"
+}

client/tailscale/routes.go

@@ -0,0 +1,98 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build go1.18
+// +build go1.18
+
+package tailscale
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"net/http"
+
+	"inet.af/netaddr"
+)
+
+// Routes contains the lists of subnet routes that are currently advertised by a device,
+// as well as the subnets that are enabled to be routed by the device.
+type Routes struct {
+	AdvertisedRoutes []netaddr.IPPrefix `json:"advertisedRoutes"`
+	EnabledRoutes    []netaddr.IPPrefix `json:"enabledRoutes"`
+}
+
+// Routes retrieves the list of subnet routes that have been enabled for a device.
+// The routes that are returned are not necessarily advertised by the device,
+// they have only been preapproved.
+func (c *Client) Routes(ctx context.Context, deviceID string) (routes *Routes, err error) {
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.Routes: %w", err)
+		}
+	}()
+
+	path := fmt.Sprintf("%s/api/v2/device/%s/routes", c.baseURL(), deviceID)
+	req, err := http.NewRequestWithContext(ctx, "GET", path, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return nil, err
+	}
+	// If status code was not successful, return the error.
+	// TODO: Change the check for the StatusCode to include other 2XX success codes.
+	if resp.StatusCode != http.StatusOK {
+		return nil, handleErrorResponse(b, resp)
+	}
+
+	var sr Routes
+	err = json.Unmarshal(b, &sr)
+	return &sr, err
+}
+
+type postRoutesParams struct {
+	Routes []netaddr.IPPrefix `json:"routes"`
+}
+
+// SetRoutes updates the list of subnets that are enabled for a device.
+// Subnets must be parsable by inet.af/netaddr.ParseIPPrefix.
+// Subnets do not have to be currently advertised by a device, they may be pre-enabled.
+// Returns the updated list of enabled and advertised subnet routes in a *Routes object.
+func (c *Client) SetRoutes(ctx context.Context, deviceID string, subnets []netaddr.IPPrefix) (routes *Routes, err error) {
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.SetRoutes: %w", err)
+		}
+	}()
+	params := &postRoutesParams{Routes: subnets}
+	data, err := json.Marshal(params)
+	if err != nil {
+		return nil, err
+	}
+	path := fmt.Sprintf("%s/api/v2/device/%s/routes", c.baseURL(), deviceID)
+	req, err := http.NewRequestWithContext(ctx, "POST", path, bytes.NewBuffer(data))
+	if err != nil {
+		return nil, err
+	}
+
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return nil, err
+	}
+	// If status code was not successful, return the error.
+	// TODO: Change the check for the StatusCode to include other 2XX success codes.
+	if resp.StatusCode != http.StatusOK {
+		return nil, handleErrorResponse(b, resp)
+	}
+
+	var srr *Routes
+	if err := json.Unmarshal(b, &srr); err != nil {
+		return nil, err
+	}
+	return srr, err
+}

client/tailscale/tailnet.go

@@ -0,0 +1,42 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build go1.18
+// +build go1.18
+
+package tailscale
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/url"
+)
+
+// TailnetDeleteRequest handles sending a DELETE request for a tailnet to control.
+func (c *Client) TailnetDeleteRequest(ctx context.Context, tailnetID string) (err error) {
+	defer func() {
+		if err != nil {
+			err = fmt.Errorf("tailscale.DeleteTailnet: %w", err)
+		}
+	}()
+
+	path := fmt.Sprintf("%s/api/v2/tailnet/%s", c.baseURL(), url.PathEscape(string(tailnetID)))
+	req, err := http.NewRequestWithContext(ctx, http.MethodDelete, path, nil)
+	if err != nil {
+		return err
+	}
+
+	c.setAuth(req)
+	b, resp, err := c.sendRequest(req)
+	if err != nil {
+		return err
+	}
+
+	if resp.StatusCode != http.StatusOK {
+		return handleErrorResponse(b, resp)
+	}
+
+	return nil
+}

client/tailscale/tailscale.go

@@ -1,601 +1,160 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
 //go:build go1.18
 // +build go1.18
 
-// Package tailscale contains Tailscale client code.
+// Package tailscale contains Go clients for the Tailscale Local API and
+// Tailscale control plane API.
+//
+// Warning: this package is in development and makes no API compatibility
+// promises as of 2022-04-29. It is subject to change at any time.
 package tailscale
 
 import (
-	"bytes"
-	"context"
-	"crypto/tls"
 	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
 	"io/ioutil"
-	"net"
 	"net/http"
-	"net/http/httptrace"
-	"net/url"
-	"os/exec"
-	"runtime"
-	"strconv"
-	"strings"
-	"sync"
-	"time"
-
-	"go4.org/mem"
-	"tailscale.com/client/tailscale/apitype"
-	"tailscale.com/ipn"
-	"tailscale.com/ipn/ipnstate"
-	"tailscale.com/net/netutil"
-	"tailscale.com/paths"
-	"tailscale.com/safesocket"
-	"tailscale.com/tailcfg"
-	"tailscale.com/version"
 )
 
-var (
-	// TailscaledSocket is the tailscaled Unix socket. It's used by the TailscaledDialer.
-	TailscaledSocket = paths.DefaultTailscaledSocket()
-
-	// TailscaledSocketSetExplicitly reports whether the user explicitly set TailscaledSocket.
-	TailscaledSocketSetExplicitly bool
-
-	// TailscaledDialer is the DialContext func that connects to the local machine's
-	// tailscaled or equivalent.
-	TailscaledDialer = defaultDialer
-)
-
-func defaultDialer(ctx context.Context, network, addr string) (net.Conn, error) {
-	if addr != "local-tailscaled.sock:80" {
-		return nil, fmt.Errorf("unexpected URL address %q", addr)
-	}
-	// TODO: make this part of a safesocket.ConnectionStrategy
-	if !TailscaledSocketSetExplicitly {
-		// On macOS, when dialing from non-sandboxed program to sandboxed GUI running
-		// a TCP server on a random port, find the random port. For HTTP connections,
-		// we don't send the token. It gets added in an HTTP Basic-Auth header.
-		if port, _, err := safesocket.LocalTCPPortAndToken(); err == nil {
-			var d net.Dialer
-			return d.DialContext(ctx, "tcp", "localhost:"+strconv.Itoa(port))
-		}
-	}
-	s := safesocket.DefaultConnectionStrategy(TailscaledSocket)
-	// The user provided a non-default tailscaled socket address.
-	// Connect only to exactly what they provided.
-	s.UseFallback(false)
-	return safesocket.Connect(s)
-}
-
-var (
-	// tsClient does HTTP requests to the local Tailscale daemon.
-	// We lazily initialize the client in case the caller wants to
-	// override TailscaledDialer.
-	tsClient     *http.Client
-	tsClientOnce sync.Once
-)
-
-// DoLocalRequest makes an HTTP request to the local machine's Tailscale daemon.
+// I_Acknowledge_This_API_Is_Unstable must be set true to use this package
+// for now. It was added 2022-04-29 when it was moved to this git repo
+// and will be removed when the public API has settled.
 //
-// URLs are of the form http://local-tailscaled.sock/localapi/v0/whois?ip=1.2.3.4.
+// TODO(bradfitz): remove this after the we're happy with the public API.
+var I_Acknowledge_This_API_Is_Unstable = false
+
+// TODO: use url.PathEscape() for deviceID and tailnets when constructing requests.
+
+const defaultAPIBase = "https://api.tailscale.com"
+
+// maxSize is the maximum read size (10MB) of responses from the server.
+const maxReadSize = 10 << 20
+
+// Client makes API calls to the Tailscale control plane API server.
 //
-// The hostname must be "local-tailscaled.sock", even though it
-// doesn't actually do any DNS lookup. The actual means of connecting to and
-// authenticating to the local Tailscale daemon vary by platform.
+// Use NewClient to instantiate one. Exported fields should be set before
+// the client is used and not changed thereafter.
+type Client struct {
+	// tailnet is the globally unique identifier for a Tailscale network, such
+	// as "example.com" or "user@gmail.com".
+	tailnet string
+	// auth is the authentication method to use for this client.
+	// nil means none, which generally won't work, but won't crash.
+	auth AuthMethod
+
+	// BaseURL optionally specifies an alternate API server to use.
+	// If empty, "https://api.tailscale.com" is used.
+	BaseURL string
+
+	// HTTPClient optionally specifies an alternate HTTP client to use.
+	// If nil, http.DefaultClient is used.
+	HTTPClient *http.Client
+}
+
+func (c *Client) httpClient() *http.Client {
+	if c.HTTPClient != nil {
+		return c.HTTPClient
+	}
+	return http.DefaultClient
+}
+
+func (c *Client) baseURL() string {
+	if c.BaseURL != "" {
+		return c.BaseURL
+	}
+	return defaultAPIBase
+}
+
+// AuthMethod is the interface for API authentication methods.
 //
-// DoLocalRequest may mutate the request to add Authorization headers.
-func DoLocalRequest(req *http.Request) (*http.Response, error) {
-	tsClientOnce.Do(func() {
-		tsClient = &http.Client{
-			Transport: &http.Transport{
-				DialContext: TailscaledDialer,
-			},
-		}
-	})
-	if _, token, err := safesocket.LocalTCPPortAndToken(); err == nil {
-		req.SetBasicAuth("", token)
-	}
-	return tsClient.Do(req)
+// Most users will use AuthKey.
+type AuthMethod interface {
+	modifyRequest(req *http.Request)
 }
 
-func doLocalRequestNiceError(req *http.Request) (*http.Response, error) {
-	res, err := DoLocalRequest(req)
-	if err == nil {
-		if server := res.Header.Get("Tailscale-Version"); server != "" && server != version.Long && onVersionMismatch != nil {
-			onVersionMismatch(version.Long, server)
-		}
-		if res.StatusCode == 403 {
-			all, _ := ioutil.ReadAll(res.Body)
-			return nil, &AccessDeniedError{errors.New(errorMessageFromBody(all))}
-		}
-		return res, nil
-	}
-	if ue, ok := err.(*url.Error); ok {
-		if oe, ok := ue.Err.(*net.OpError); ok && oe.Op == "dial" {
-			path := req.URL.Path
-			pathPrefix, _, _ := strings.Cut(path, "?")
-			return nil, fmt.Errorf("Failed to connect to local Tailscale daemon for %s; %s Error: %w", pathPrefix, tailscaledConnectHint(), oe)
-		}
-	}
-	return nil, err
+// APIKey is an AuthMethod for NewClient that authenticates requests
+// using an authkey.
+type APIKey string
+
+func (ak APIKey) modifyRequest(req *http.Request) {
+	req.SetBasicAuth(string(ak), "")
 }
 
-type errorJSON struct {
-	Error string
+func (c *Client) setAuth(r *http.Request) {
+	if c.auth != nil {
+		c.auth.modifyRequest(r)
+	}
 }
 
-// AccessDeniedError is an error due to permissions.
-type AccessDeniedError struct {
-	err error
-}
-
-func (e *AccessDeniedError) Error() string { return fmt.Sprintf("Access denied: %v", e.err) }
-func (e *AccessDeniedError) Unwrap() error { return e.err }
-
-// IsAccessDeniedError reports whether err is or wraps an AccessDeniedError.
-func IsAccessDeniedError(err error) bool {
-	var ae *AccessDeniedError
-	return errors.As(err, &ae)
-}
-
-// bestError returns either err, or if body contains a valid JSON
-// object of type errorJSON, its non-empty error body.
-func bestError(err error, body []byte) error {
-	var j errorJSON
-	if err := json.Unmarshal(body, &j); err == nil && j.Error != "" {
-		return errors.New(j.Error)
-	}
-	return err
-}
-
-func errorMessageFromBody(body []byte) string {
-	var j errorJSON
-	if err := json.Unmarshal(body, &j); err == nil && j.Error != "" {
-		return j.Error
-	}
-	return strings.TrimSpace(string(body))
-}
-
-var onVersionMismatch func(clientVer, serverVer string)
-
-// SetVersionMismatchHandler sets f as the version mismatch handler
-// to be called when the client (the current process) has a version
-// number that doesn't match the server's declared version.
-func SetVersionMismatchHandler(f func(clientVer, serverVer string)) {
-	onVersionMismatch = f
-}
-
-func send(ctx context.Context, method, path string, wantStatus int, body io.Reader) ([]byte, error) {
-	req, err := http.NewRequestWithContext(ctx, method, "http://local-tailscaled.sock"+path, body)
-	if err != nil {
-		return nil, err
-	}
-	res, err := doLocalRequestNiceError(req)
-	if err != nil {
-		return nil, err
-	}
-	defer res.Body.Close()
-	slurp, err := ioutil.ReadAll(res.Body)
-	if err != nil {
-		return nil, err
-	}
-	if res.StatusCode != wantStatus {
-		err = fmt.Errorf("%v: %s", res.Status, bytes.TrimSpace(slurp))
-		return nil, bestError(err, slurp)
-	}
-	return slurp, nil
-}
-
-func get200(ctx context.Context, path string) ([]byte, error) {
-	return send(ctx, "GET", path, 200, nil)
-}
-
-// WhoIs returns the owner of the remoteAddr, which must be an IP or IP:port.
-func WhoIs(ctx context.Context, remoteAddr string) (*apitype.WhoIsResponse, error) {
-	body, err := get200(ctx, "/localapi/v0/whois?addr="+url.QueryEscape(remoteAddr))
-	if err != nil {
-		return nil, err
-	}
-	r := new(apitype.WhoIsResponse)
-	if err := json.Unmarshal(body, r); err != nil {
-		if max := 200; len(body) > max {
-			body = append(body[:max], "..."...)
-		}
-		return nil, fmt.Errorf("failed to parse JSON WhoIsResponse from %q", body)
-	}
-	return r, nil
-}
-
-// Goroutines returns a dump of the Tailscale daemon's current goroutines.
-func Goroutines(ctx context.Context) ([]byte, error) {
-	return get200(ctx, "/localapi/v0/goroutines")
-}
-
-// DaemonMetrics returns the Tailscale daemon's metrics in
-// the Prometheus text exposition format.
-func DaemonMetrics(ctx context.Context) ([]byte, error) {
-	return get200(ctx, "/localapi/v0/metrics")
-}
-
-// Profile returns a pprof profile of the Tailscale daemon.
-func Profile(ctx context.Context, pprofType string, sec int) ([]byte, error) {
-	var secArg string
-	if sec < 0 || sec > 300 {
-		return nil, errors.New("duration out of range")
-	}
-	if sec != 0 || pprofType == "profile" {
-		secArg = fmt.Sprint(sec)
-	}
-	return get200(ctx, fmt.Sprintf("/localapi/v0/profile?name=%s&seconds=%v", url.QueryEscape(pprofType), secArg))
-}
-
-// BugReport logs and returns a log marker that can be shared by the user with support.
-func BugReport(ctx context.Context, note string) (string, error) {
-	body, err := send(ctx, "POST", "/localapi/v0/bugreport?note="+url.QueryEscape(note), 200, nil)
-	if err != nil {
-		return "", err
-	}
-	return strings.TrimSpace(string(body)), nil
-}
-
-// DebugAction invokes a debug action, such as "rebind" or "restun".
-// These are development tools and subject to change or removal over time.
-func DebugAction(ctx context.Context, action string) error {
-	body, err := send(ctx, "POST", "/localapi/v0/debug?action="+url.QueryEscape(action), 200, nil)
-	if err != nil {
-		return fmt.Errorf("error %w: %s", err, body)
-	}
-	return nil
-}
-
-// Status returns the Tailscale daemon's status.
-func Status(ctx context.Context) (*ipnstate.Status, error) {
-	return status(ctx, "")
-}
-
-// StatusWithoutPeers returns the Tailscale daemon's status, without the peer info.
-func StatusWithoutPeers(ctx context.Context) (*ipnstate.Status, error) {
-	return status(ctx, "?peers=false")
-}
-
-func status(ctx context.Context, queryString string) (*ipnstate.Status, error) {
-	body, err := get200(ctx, "/localapi/v0/status"+queryString)
-	if err != nil {
-		return nil, err
-	}
-	st := new(ipnstate.Status)
-	if err := json.Unmarshal(body, st); err != nil {
-		return nil, err
-	}
-	return st, nil
-}
-
-// IDToken is a request to get an OIDC ID token for an audience.
-// The token can be presented to any resource provider which offers OIDC
-// Federation.
-func IDToken(ctx context.Context, aud string) (*tailcfg.TokenResponse, error) {
-	body, err := get200(ctx, "/localapi/v0/id-token?aud="+url.QueryEscape(aud))
-	if err != nil {
-		return nil, err
-	}
-	tr := new(tailcfg.TokenResponse)
-	if err := json.Unmarshal(body, tr); err != nil {
-		return nil, err
-	}
-	return tr, nil
-}
-
-func WaitingFiles(ctx context.Context) ([]apitype.WaitingFile, error) {
-	body, err := get200(ctx, "/localapi/v0/files/")
-	if err != nil {
-		return nil, err
-	}
-	var wfs []apitype.WaitingFile
-	if err := json.Unmarshal(body, &wfs); err != nil {
-		return nil, err
-	}
-	return wfs, nil
-}
-
-func DeleteWaitingFile(ctx context.Context, baseName string) error {
-	_, err := send(ctx, "DELETE", "/localapi/v0/files/"+url.PathEscape(baseName), http.StatusNoContent, nil)
-	return err
-}
-
-func GetWaitingFile(ctx context.Context, baseName string) (rc io.ReadCloser, size int64, err error) {
-	req, err := http.NewRequestWithContext(ctx, "GET", "http://local-tailscaled.sock/localapi/v0/files/"+url.PathEscape(baseName), nil)
-	if err != nil {
-		return nil, 0, err
-	}
-	res, err := doLocalRequestNiceError(req)
-	if err != nil {
-		return nil, 0, err
-	}
-	if res.ContentLength == -1 {
-		res.Body.Close()
-		return nil, 0, fmt.Errorf("unexpected chunking")
-	}
-	if res.StatusCode != 200 {
-		body, _ := ioutil.ReadAll(res.Body)
-		res.Body.Close()
-		return nil, 0, fmt.Errorf("HTTP %s: %s", res.Status, body)
-	}
-	return res.Body, res.ContentLength, nil
-}
-
-func FileTargets(ctx context.Context) ([]apitype.FileTarget, error) {
-	body, err := get200(ctx, "/localapi/v0/file-targets")
-	if err != nil {
-		return nil, err
-	}
-	var fts []apitype.FileTarget
-	if err := json.Unmarshal(body, &fts); err != nil {
-		return nil, fmt.Errorf("invalid JSON: %w", err)
-	}
-	return fts, nil
-}
-
-// PushFile sends Taildrop file r to target.
+// NewClient is a convenience method for instantiating a new Client.
 //
-// A size of -1 means unknown.
-// The name parameter is the original filename, not escaped.
-func PushFile(ctx context.Context, target tailcfg.StableNodeID, size int64, name string, r io.Reader) error {
-	req, err := http.NewRequestWithContext(ctx, "PUT", "http://local-tailscaled.sock/localapi/v0/file-put/"+string(target)+"/"+url.PathEscape(name), r)
+// tailnet is the globally unique identifier for a Tailscale network, such
+// as "example.com" or "user@gmail.com".
+// If httpClient is nil, then http.DefaultClient is used.
+// "api.tailscale.com" is set as the BaseURL for the returned client
+// and can be changed manually by the user.
+func NewClient(tailnet string, auth AuthMethod) *Client {
+	return &Client{
+		tailnet: tailnet,
+		auth:    auth,
+	}
+}
+
+func (c *Client) Tailnet() string { return c.tailnet }
+
+// Do sends a raw HTTP request, after adding any authentication headers.
+func (c *Client) Do(req *http.Request) (*http.Response, error) {
+	if !I_Acknowledge_This_API_Is_Unstable {
+		return nil, errors.New("use of Client without setting I_Acknowledge_This_API_Is_Unstable")
+	}
+	c.setAuth(req)
+	return c.httpClient().Do(req)
+}
+
+// sendRequest add the authenication key to the request and sends it. It
+// receives the response and reads up to 10MB of it.
+func (c *Client) sendRequest(req *http.Request) ([]byte, *http.Response, error) {
+	if !I_Acknowledge_This_API_Is_Unstable {
+		return nil, nil, errors.New("use of Client without setting I_Acknowledge_This_API_Is_Unstable")
+	}
+	c.setAuth(req)
+	resp, err := c.httpClient().Do(req)
 	if err != nil {
+		return nil, resp, err
+	}
+	defer resp.Body.Close()
+
+	// Read response. Limit the response to 10MB.
+	body := io.LimitReader(resp.Body, maxReadSize+1)
+	b, err := ioutil.ReadAll(body)
+	if len(b) > maxReadSize {
+		err = errors.New("API response too large")
+	}
+	return b, resp, err
+}
+
+// ErrResponse is the HTTP error returned by the Tailscale server.
+type ErrResponse struct {
+	Status  int
+	Message string
+}
+
+func (e ErrResponse) Error() string {
+	return fmt.Sprintf("Status: %d, Message: %q", e.Status, e.Message)
+}
+
+// handleErrorResponse decodes the error message from the server and returns
+// an ErrResponse from it.
+func handleErrorResponse(b []byte, resp *http.Response) error {
+	var errResp ErrResponse
+	if err := json.Unmarshal(b, &errResp); err != nil {
 		return err
 	}
-	if size != -1 {
-		req.ContentLength = size
-	}
-	res, err := doLocalRequestNiceError(req)
-	if err != nil {
-		return err
-	}
-	if res.StatusCode == 200 {
-		io.Copy(io.Discard, res.Body)
-		return nil
-	}
-	all, _ := io.ReadAll(res.Body)
-	return bestError(fmt.Errorf("%s: %s", res.Status, all), all)
-}
-
-func CheckIPForwarding(ctx context.Context) error {
-	body, err := get200(ctx, "/localapi/v0/check-ip-forwarding")
-	if err != nil {
-		return err
-	}
-	var jres struct {
-		Warning string
-	}
-	if err := json.Unmarshal(body, &jres); err != nil {
-		return fmt.Errorf("invalid JSON from check-ip-forwarding: %w", err)
-	}
-	if jres.Warning != "" {
-		return errors.New(jres.Warning)
-	}
-	return nil
-}
-
-func GetPrefs(ctx context.Context) (*ipn.Prefs, error) {
-	body, err := get200(ctx, "/localapi/v0/prefs")
-	if err != nil {
-		return nil, err
-	}
-	var p ipn.Prefs
-	if err := json.Unmarshal(body, &p); err != nil {
-		return nil, fmt.Errorf("invalid prefs JSON: %w", err)
-	}
-	return &p, nil
-}
-
-func EditPrefs(ctx context.Context, mp *ipn.MaskedPrefs) (*ipn.Prefs, error) {
-	mpj, err := json.Marshal(mp)
-	if err != nil {
-		return nil, err
-	}
-	body, err := send(ctx, "PATCH", "/localapi/v0/prefs", http.StatusOK, bytes.NewReader(mpj))
-	if err != nil {
-		return nil, err
-	}
-	var p ipn.Prefs
-	if err := json.Unmarshal(body, &p); err != nil {
-		return nil, fmt.Errorf("invalid prefs JSON: %w", err)
-	}
-	return &p, nil
-}
-
-func Logout(ctx context.Context) error {
-	_, err := send(ctx, "POST", "/localapi/v0/logout", http.StatusNoContent, nil)
-	return err
-}
-
-// SetDNS adds a DNS TXT record for the given domain name, containing
-// the provided TXT value. The intended use case is answering
-// LetsEncrypt/ACME dns-01 challenges.
-//
-// The control plane will only permit SetDNS requests with very
-// specific names and values. The name should be
-// "_acme-challenge." + your node's MagicDNS name. It's expected that
-// clients cache the certs from LetsEncrypt (or whichever CA is
-// providing them) and only request new ones as needed; the control plane
-// rate limits SetDNS requests.
-//
-// This is a low-level interface; it's expected that most Tailscale
-// users use a higher level interface to getting/using TLS
-// certificates.
-func SetDNS(ctx context.Context, name, value string) error {
-	v := url.Values{}
-	v.Set("name", name)
-	v.Set("value", value)
-	_, err := send(ctx, "POST", "/localapi/v0/set-dns?"+v.Encode(), 200, nil)
-	return err
-}
-
-// DialTCP connects to the host's port via Tailscale.
-//
-// The host may be a base DNS name (resolved from the netmap inside
-// tailscaled), a FQDN, or an IP address.
-//
-// The ctx is only used for the duration of the call, not the lifetime of the net.Conn.
-func DialTCP(ctx context.Context, host string, port uint16) (net.Conn, error) {
-	connCh := make(chan net.Conn, 1)
-	trace := httptrace.ClientTrace{
-		GotConn: func(info httptrace.GotConnInfo) {
-			connCh <- info.Conn
-		},
-	}
-	ctx = httptrace.WithClientTrace(ctx, &trace)
-	req, err := http.NewRequestWithContext(ctx, "POST", "http://local-tailscaled.sock/localapi/v0/dial", nil)
-	if err != nil {
-		return nil, err
-	}
-	req.Header = http.Header{
-		"Upgrade":    []string{"ts-dial"},
-		"Connection": []string{"upgrade"},
-		"Dial-Host":  []string{host},
-		"Dial-Port":  []string{fmt.Sprint(port)},
-	}
-	res, err := DoLocalRequest(req)
-	if err != nil {
-		return nil, err
-	}
-	if res.StatusCode != http.StatusSwitchingProtocols {
-		body, _ := io.ReadAll(res.Body)
-		res.Body.Close()
-		return nil, fmt.Errorf("unexpected HTTP response: %s, %s", res.Status, body)
-	}
-	// From here on, the underlying net.Conn is ours to use, but there
-	// is still a read buffer attached to it within resp.Body. So, we
-	// must direct I/O through resp.Body, but we can still use the
-	// underlying net.Conn for stuff like deadlines.
-	var switchedConn net.Conn
-	select {
-	case switchedConn = <-connCh:
-	default:
-	}
-	if switchedConn == nil {
-		res.Body.Close()
-		return nil, fmt.Errorf("httptrace didn't provide a connection")
-	}
-	rwc, ok := res.Body.(io.ReadWriteCloser)
-	if !ok {
-		res.Body.Close()
-		return nil, errors.New("http Transport did not provide a writable body")
-	}
-	return netutil.NewAltReadWriteCloserConn(rwc, switchedConn), nil
-}
-
-// CurrentDERPMap returns the current DERPMap that is being used by the local tailscaled.
-// It is intended to be used with netcheck to see availability of DERPs.
-func CurrentDERPMap(ctx context.Context) (*tailcfg.DERPMap, error) {
-	var derpMap tailcfg.DERPMap
-	res, err := send(ctx, "GET", "/localapi/v0/derpmap", 200, nil)
-	if err != nil {
-		return nil, err
-	}
-	if err = json.Unmarshal(res, &derpMap); err != nil {
-		return nil, fmt.Errorf("invalid derp map json: %w", err)
-	}
-	return &derpMap, nil
-}
-
-// CertPair returns a cert and private key for the provided DNS domain.
-//
-// It returns a cached certificate from disk if it's still valid.
-func CertPair(ctx context.Context, domain string) (certPEM, keyPEM []byte, err error) {
-	res, err := send(ctx, "GET", "/localapi/v0/cert/"+domain+"?type=pair", 200, nil)
-	if err != nil {
-		return nil, nil, err
-	}
-	// with ?type=pair, the response PEM is first the one private
-	// key PEM block, then the cert PEM blocks.
-	i := mem.Index(mem.B(res), mem.S("--\n--"))
-	if i == -1 {
-		return nil, nil, fmt.Errorf("unexpected output: no delimiter")
-	}
-	i += len("--\n")
-	keyPEM, certPEM = res[:i], res[i:]
-	if mem.Contains(mem.B(certPEM), mem.S(" PRIVATE KEY-----")) {
-		return nil, nil, fmt.Errorf("unexpected output: key in cert")
-	}
-	return certPEM, keyPEM, nil
-}
-
-// GetCertificate fetches a TLS certificate for the TLS ClientHello in hi.
-//
-// It returns a cached certificate from disk if it's still valid.
-//
-// It's the right signature to use as the value of
-// tls.Config.GetCertificate.
-func GetCertificate(hi *tls.ClientHelloInfo) (*tls.Certificate, error) {
-	if hi == nil || hi.ServerName == "" {
-		return nil, errors.New("no SNI ServerName")
-	}
-	ctx, cancel := context.WithTimeout(context.Background(), time.Minute)
-	defer cancel()
-
-	name := hi.ServerName
-	if !strings.Contains(name, ".") {
-		if v, ok := ExpandSNIName(ctx, name); ok {
-			name = v
-		}
-	}
-	certPEM, keyPEM, err := CertPair(ctx, name)
-	if err != nil {
-		return nil, err
-	}
-	cert, err := tls.X509KeyPair(certPEM, keyPEM)
-	if err != nil {
-		return nil, err
-	}
-	return &cert, nil
-}
-
-// ExpandSNIName expands bare label name into the the most likely actual TLS cert name.
-func ExpandSNIName(ctx context.Context, name string) (fqdn string, ok bool) {
-	st, err := StatusWithoutPeers(ctx)
-	if err != nil {
-		return "", false
-	}
-	for _, d := range st.CertDomains {
-		if len(d) > len(name)+1 && strings.HasPrefix(d, name) && d[len(name)] == '.' {
-			return d, true
-		}
-	}
-	return "", false
-}
-
-// tailscaledConnectHint gives a little thing about why tailscaled (or
-// platform equivalent) is not answering localapi connections.
-//
-// It ends in a punctuation. See caller.
-func tailscaledConnectHint() string {
-	if runtime.GOOS != "linux" {
-		// TODO(bradfitz): flesh this out
-		return "not running?"
-	}
-	out, err := exec.Command("systemctl", "show", "tailscaled.service", "--no-page", "--property", "LoadState,ActiveState,SubState").Output()
-	if err != nil {
-		return "not running?"
-	}
-	// Parse:
-	// LoadState=loaded
-	// ActiveState=inactive
-	// SubState=dead
-	st := map[string]string{}
-	for _, line := range strings.Split(string(out), "\n") {
-		if k, v, ok := strings.Cut(line, "="); ok {
-			st[k] = strings.TrimSpace(v)
-		}
-	}
-	if st["LoadState"] == "loaded" &&
-		(st["SubState"] != "running" || st["ActiveState"] != "active") {
-		return "systemd tailscaled.service not running."
-	}
-	return "not running?"
+	errResp.Status = resp.StatusCode
+	return errResp
 }

cmd/cloner/cloner.go

@@ -22,13 +22,11 @@ import (
 	"os"
 	"strings"
 
-	"golang.org/x/tools/go/packages"
 	"tailscale.com/util/codegen"
 )
 
 var (
 	flagTypes     = flag.String("type", "", "comma-separated list of types; required")
-	flagOutput    = flag.String("output", "", "output file; required")
 	flagBuildTags = flag.String("tags", "", "compiler build tags to apply")
 	flagCloneFunc = flag.Bool("clonefunc", false, "add a top-level Clone func")
 )
@@ -43,30 +41,18 @@ func main() {
 	}
 	typeNames := strings.Split(*flagTypes, ",")
 
-	cfg := &packages.Config{
-		Mode:  packages.NeedTypes | packages.NeedTypesInfo | packages.NeedSyntax | packages.NeedName,
-		Tests: false,
-	}
-	if *flagBuildTags != "" {
-		cfg.BuildFlags = []string{"-tags=" + *flagBuildTags}
-	}
-	pkgs, err := packages.Load(cfg, ".")
+	pkg, namedTypes, err := codegen.LoadTypes(*flagBuildTags, ".")
 	if err != nil {
 		log.Fatal(err)
 	}
-	if len(pkgs) != 1 {
-		log.Fatalf("wrong number of packages: %d", len(pkgs))
-	}
-	pkg := pkgs[0]
+	it := codegen.NewImportTracker(pkg.Types)
 	buf := new(bytes.Buffer)
-	imports := make(map[string]struct{})
-	namedTypes := codegen.NamedTypes(pkg)
 	for _, typeName := range typeNames {
 		typ, ok := namedTypes[typeName]
 		if !ok {
 			log.Fatalf("could not find type %s", typeName)
 		}
-		gen(buf, imports, typ, pkg.Types)
+		gen(buf, it, typ)
 	}
 
 	w := func(format string, args ...any) {
@@ -93,62 +79,13 @@ func main() {
 		w("	return false")
 		w("}")
 	}
-
-	contents := new(bytes.Buffer)
-	var flagArgs []string
-	if *flagTypes != "" {
-		flagArgs = append(flagArgs, "-type="+*flagTypes)
-	}
-	if *flagOutput != "" {
-		flagArgs = append(flagArgs, "-output="+*flagOutput)
-	}
-	if *flagBuildTags != "" {
-		flagArgs = append(flagArgs, "-tags="+*flagBuildTags)
-	}
-	if *flagCloneFunc {
-		flagArgs = append(flagArgs, "-clonefunc")
-	}
-	fmt.Fprintf(contents, header, strings.Join(flagArgs, " "), pkg.Name)
-	fmt.Fprintf(contents, "import (\n")
-	for s := range imports {
-		fmt.Fprintf(contents, "\t%q\n", s)
-	}
-	fmt.Fprintf(contents, ")\n\n")
-	contents.Write(buf.Bytes())
-
-	output := *flagOutput
-	if output == "" {
-		flag.Usage()
-		os.Exit(2)
-	}
-	if err := codegen.WriteFormatted(contents.Bytes(), output); err != nil {
+	cloneOutput := pkg.Name + "_clone.go"
+	if err := codegen.WritePackageFile("tailscale.com/cmd/cloner", pkg, cloneOutput, it, buf); err != nil {
 		log.Fatal(err)
 	}
 }
 
-const header = `// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Code generated by tailscale.com/cmd/cloner; DO NOT EDIT.
-//` + `go:generate` + ` go run tailscale.com/cmd/cloner %s
-
-package %s
-
-`
-
-func gen(buf *bytes.Buffer, imports map[string]struct{}, typ *types.Named, thisPkg *types.Package) {
-	pkgQual := func(pkg *types.Package) string {
-		if thisPkg == pkg {
-			return ""
-		}
-		imports[pkg.Path()] = struct{}{}
-		return pkg.Name()
-	}
-	importedName := func(t types.Type) string {
-		return types.TypeString(t, pkgQual)
-	}
-
+func gen(buf *bytes.Buffer, it *codegen.ImportTracker, typ *types.Named) {
 	t, ok := typ.Underlying().(*types.Struct)
 	if !ok {
 		return
@@ -169,11 +106,11 @@ func gen(buf *bytes.Buffer, imports map[string]struct{}, typ *types.Named, thisP
 	for i := 0; i < t.NumFields(); i++ {
 		fname := t.Field(i).Name()
 		ft := t.Field(i).Type()
-		if !codegen.ContainsPointers(ft) {
+		if !codegen.ContainsPointers(ft) || codegen.HasNoClone(t.Tag(i)) {
 			continue
 		}
 		if named, _ := ft.(*types.Named); named != nil {
-			if isViewType(ft) {
+			if codegen.IsViewType(ft) {
 				writef("dst.%s = src.%s", fname, fname)
 				continue
 			}
@@ -185,11 +122,16 @@ func gen(buf *bytes.Buffer, imports map[string]struct{}, typ *types.Named, thisP
 		switch ft := ft.Underlying().(type) {
 		case *types.Slice:
 			if codegen.ContainsPointers(ft.Elem()) {
-				n := importedName(ft.Elem())
+				n := it.QualifiedName(ft.Elem())
 				writef("dst.%s = make([]%s, len(src.%s))", fname, n, fname)
 				writef("for i := range dst.%s {", fname)
-				if _, isPtr := ft.Elem().(*types.Pointer); isPtr {
-					writef("\tdst.%s[i] = src.%s[i].Clone()", fname, fname)
+				if ptr, isPtr := ft.Elem().(*types.Pointer); isPtr {
+					if _, isBasic := ptr.Elem().Underlying().(*types.Basic); isBasic {
+						writef("\tx := *src.%s[i]", fname)
+						writef("\tdst.%s[i] = &x", fname)
+					} else {
+						writef("\tdst.%s[i] = src.%s[i].Clone()", fname, fname)
+					}
 				} else {
 					writef("\tdst.%s[i] = *src.%s[i].Clone()", fname, fname)
 				}
@@ -202,7 +144,7 @@ func gen(buf *bytes.Buffer, imports map[string]struct{}, typ *types.Named, thisP
 				writef("dst.%s = src.%s.Clone()", fname, fname)
 				continue
 			}
-			n := importedName(ft.Elem())
+			n := it.QualifiedName(ft.Elem())
 			writef("if dst.%s != nil {", fname)
 			writef("\tdst.%s = new(%s)", fname, n)
 			writef("\t*dst.%s = *src.%s", fname, fname)
@@ -212,9 +154,9 @@ func gen(buf *bytes.Buffer, imports map[string]struct{}, typ *types.Named, thisP
 			writef("}")
 		case *types.Map:
 			writef("if dst.%s != nil {", fname)
-			writef("\tdst.%s = map[%s]%s{}", fname, importedName(ft.Key()), importedName(ft.Elem()))
+			writef("\tdst.%s = map[%s]%s{}", fname, it.QualifiedName(ft.Key()), it.QualifiedName(ft.Elem()))
 			if sliceType, isSlice := ft.Elem().(*types.Slice); isSlice {
-				n := importedName(sliceType.Elem())
+				n := it.QualifiedName(sliceType.Elem())
 				writef("\tfor k := range src.%s {", fname)
 				// use zero-length slice instead of nil to ensure
 				// the key is always copied.
@@ -237,20 +179,10 @@ func gen(buf *bytes.Buffer, imports map[string]struct{}, typ *types.Named, thisP
 	writef("return dst")
 	fmt.Fprintf(buf, "}\n\n")
 
-	buf.Write(codegen.AssertStructUnchanged(t, thisPkg, name, "Clone", imports))
-}
-
-func isViewType(typ types.Type) bool {
-	t, ok := typ.Underlying().(*types.Struct)
-	if !ok {
-		return false
-	}
-	if t.NumFields() != 1 {
-		return false
-	}
-	return t.Field(0).Name() == "ж"
+	buf.Write(codegen.AssertStructUnchanged(t, name, "Clone", it))
 }
 
+// hasBasicUnderlying reports true when typ.Underlying() is a slice or a map.
 func hasBasicUnderlying(typ types.Type) bool {
 	switch typ.Underlying().(type) {
 	case *types.Slice, *types.Map:

cmd/derper/websocket.go

@@ -6,6 +6,7 @@ package main
 
 import (
 	"bufio"
+	"context"
 	"expvar"
 	"log"
 	"net/http"
@@ -13,7 +14,6 @@ import (
 
 	"nhooyr.io/websocket"
 	"tailscale.com/derp"
-	"tailscale.com/derp/wsconn"
 )
 
 var counterWebSocketAccepts = expvar.NewInt("derp_websocket_accepts")
@@ -45,7 +45,7 @@ func addWebSocketSupport(s *derp.Server, base http.Handler) http.Handler {
 			return
 		}
 		counterWebSocketAccepts.Add(1)
-		wc := wsconn.New(c)
+		wc := websocket.NetConn(context.Background(), c, websocket.MessageBinary)
 		brw := bufio.NewReadWriter(bufio.NewReader(wc), bufio.NewWriter(wc))
 		s.Accept(wc, brw, r.RemoteAddr)
 	})

cmd/gitops-pusher/README.md

@@ -0,0 +1,48 @@
+# gitops-pusher
+
+This is a small tool to help people achieve a
+[GitOps](https://about.gitlab.com/topics/gitops/) workflow with Tailscale ACL
+changes. This tool is intended to be used in a CI flow that looks like this:
+
+```yaml
+name: Tailscale ACL syncing
+
+on:
+  push:
+    branches: [ "main" ]
+  pull_request:
+    branches: [ "main" ]
+
+jobs:
+  acls:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+      
+      - name: Setup Go environment
+        uses: actions/setup-go@v3.2.0
+        
+      - name: Install gitops-pusher
+        run: go install tailscale.com/cmd/gitops-pusher@latest
+              
+      - name: Deploy ACL
+        if: github.event_name == 'push'
+        env:
+          TS_API_KEY: ${{ secrets.TS_API_KEY }}
+          TS_TAILNET: ${{ secrets.TS_TAILNET }}
+        run: |
+          ~/go/bin/gitops-pusher --policy-file ./policy.hujson apply
+
+      - name: ACL tests
+        if: github.event_name == 'pull_request'
+        env:
+          TS_API_KEY: ${{ secrets.TS_API_KEY }}
+          TS_TAILNET: ${{ secrets.TS_TAILNET }}
+        run: |
+          ~/go/bin/gitops-pusher --policy-file ./policy.hujson test
+```
+
+Change the value of the `--policy-file` flag to point to the policy file on
+disk. Policy files should be in [HuJSON](https://github.com/tailscale/hujson)
+format.

cmd/gitops-pusher/gitops-pusher.go

@@ -0,0 +1,235 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Command gitops-pusher allows users to use a GitOps flow for managing Tailscale ACLs.
+//
+// See README.md for more details.
+package main
+
+import (
+	"context"
+	"crypto/sha256"
+	"encoding/json"
+	"flag"
+	"fmt"
+	"io"
+	"log"
+	"net/http"
+	"os"
+	"strings"
+	"time"
+)
+
+var (
+	policyFname = flag.String("policy-file", "./policy.hujson", "filename for policy file")
+	timeout     = flag.Duration("timeout", 5*time.Minute, "timeout for the entire CI run")
+)
+
+func main() {
+	flag.Parse()
+	ctx, cancel := context.WithTimeout(context.Background(), *timeout)
+	defer cancel()
+
+	tailnet, ok := os.LookupEnv("TS_TAILNET")
+	if !ok {
+		log.Fatal("set envvar TS_TAILNET to your tailnet's name")
+	}
+	apiKey, ok := os.LookupEnv("TS_API_KEY")
+	if !ok {
+		log.Fatal("set envvar TS_API_KEY to your Tailscale API key")
+	}
+
+	switch flag.Arg(0) {
+	case "apply":
+		controlEtag, err := getACLETag(ctx, tailnet, apiKey)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		localEtag, err := sumFile(*policyFname)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		log.Printf("control: %s", controlEtag)
+		log.Printf("local:   %s", localEtag)
+
+		if controlEtag == localEtag {
+			log.Println("no update needed, doing nothing")
+			os.Exit(0)
+		}
+
+		if err := applyNewACL(ctx, tailnet, apiKey, *policyFname, controlEtag); err != nil {
+			log.Fatal(err)
+		}
+
+	case "test":
+		controlEtag, err := getACLETag(ctx, tailnet, apiKey)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		localEtag, err := sumFile(*policyFname)
+		if err != nil {
+			log.Fatal(err)
+		}
+
+		log.Printf("control: %s", controlEtag)
+		log.Printf("local:   %s", localEtag)
+
+		if controlEtag == localEtag {
+			log.Println("no updates found, doing nothing")
+			os.Exit(0)
+		}
+
+		if err := testNewACLs(ctx, tailnet, apiKey, *policyFname); err != nil {
+			log.Fatal(err)
+		}
+	default:
+		log.Fatalf("usage: %s [options] <test|apply>", os.Args[0])
+	}
+}
+
+func sumFile(fname string) (string, error) {
+	fin, err := os.Open(fname)
+	if err != nil {
+		return "", err
+	}
+	defer fin.Close()
+
+	h := sha256.New()
+	_, err = io.Copy(h, fin)
+	if err != nil {
+		return "", err
+	}
+
+	return fmt.Sprintf("\"%x\"", h.Sum(nil)), nil
+}
+
+func applyNewACL(ctx context.Context, tailnet, apiKey, policyFname, oldEtag string) error {
+	fin, err := os.Open(policyFname)
+	if err != nil {
+		return err
+	}
+	defer fin.Close()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, fmt.Sprintf("https://api.tailscale.com/api/v2/tailnet/%s/acl", tailnet), fin)
+	if err != nil {
+		return err
+	}
+
+	req.SetBasicAuth(apiKey, "")
+	req.Header.Set("Content-Type", "application/hujson")
+	req.Header.Set("If-Match", oldEtag)
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	got := resp.StatusCode
+	want := http.StatusOK
+	if got != want {
+		var ate ACLTestError
+		err := json.NewDecoder(resp.Body).Decode(&ate)
+		if err != nil {
+			return err
+		}
+
+		return ate
+	}
+
+	return nil
+}
+
+func testNewACLs(ctx context.Context, tailnet, apiKey, policyFname string) error {
+	fin, err := os.Open(policyFname)
+	if err != nil {
+		return err
+	}
+	defer fin.Close()
+
+	req, err := http.NewRequestWithContext(ctx, http.MethodPost, fmt.Sprintf("https://api.tailscale.com/api/v2/tailnet/%s/acl/validate", tailnet), fin)
+	if err != nil {
+		return err
+	}
+
+	req.SetBasicAuth(apiKey, "")
+	req.Header.Set("Content-Type", "application/hujson")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return err
+	}
+	defer resp.Body.Close()
+
+	got := resp.StatusCode
+	want := http.StatusOK
+	if got != want {
+		return fmt.Errorf("wanted HTTP status code %d but got %d", want, got)
+	}
+
+	var ate ACLTestError
+	err = json.NewDecoder(resp.Body).Decode(&ate)
+	if err != nil {
+		return err
+	}
+
+	if len(ate.Data) != 0 {
+		return ate
+	}
+
+	return nil
+}
+
+type ACLTestError struct {
+	Message string               `json:"message"`
+	Data    []ACLTestErrorDetail `json:"data"`
+}
+
+func (ate ACLTestError) Error() string {
+	var sb strings.Builder
+
+	fmt.Fprintln(&sb, ate.Message)
+	fmt.Fprintln(&sb)
+
+	for _, data := range ate.Data {
+		fmt.Fprintf(&sb, "For user %s:\n", data.User)
+		for _, err := range data.Errors {
+			fmt.Fprintf(&sb, "- %s\n", err)
+		}
+	}
+
+	return sb.String()
+}
+
+type ACLTestErrorDetail struct {
+	User   string   `json:"user"`
+	Errors []string `json:"errors"`
+}
+
+func getACLETag(ctx context.Context, tailnet, apiKey string) (string, error) {
+	req, err := http.NewRequestWithContext(ctx, http.MethodGet, fmt.Sprintf("https://api.tailscale.com/api/v2/tailnet/%s/acl", tailnet), nil)
+	if err != nil {
+		return "", err
+	}
+
+	req.SetBasicAuth(apiKey, "")
+	req.Header.Set("Accept", "application/hujson")
+
+	resp, err := http.DefaultClient.Do(req)
+	if err != nil {
+		return "", err
+	}
+	defer resp.Body.Close()
+
+	got := resp.StatusCode
+	want := http.StatusOK
+	if got != want {
+		return "", fmt.Errorf("wanted HTTP status code %d but got %d", want, got)
+	}
+
+	return resp.Header.Get("ETag"), nil
+}

cmd/nginx-auth/README.md

@@ -117,10 +117,32 @@ header.
 
 The `Tailscale-Tailnet` header can help you identify which tailnet the session
 is coming from. If you are using node sharing, this can help you make sure that
-you aren't giving administrative access to people outside your tailnet. You will
-need to be sure to check this in your application code. If you use OpenResty,
-you may be able to do more complicated access controls than you can with NGINX
-alone.
+you aren't giving administrative access to people outside your tailnet.
+
+### Allow Requests From Only One Tailnet
+
+If you want to prevent node sharing from allowing users to access a service, add
+the `Expected-Tailnet` header to your auth request:
+
+```nginx
+location /auth {
+  # ...
+  proxy_set_header Expected-Tailnet "tailscale.com";
+}
+```
+
+If a user from a different tailnet tries to use that service, this will return a
+generic "forbidden" error page:
+
+```html
+<html>
+<head><title>403 Forbidden</title></head>
+<body>
+<center><h1>403 Forbidden</h1></center>
+<hr><center>nginx/1.18.0 (Ubuntu)</center>
+</body>
+</html>
+```
 
 ## Building
 

cmd/nginx-auth/deb/postinst.sh

@@ -0,0 +1,14 @@
+if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-deconfigure" ] || [ "$1" = "abort-remove" ] ; then
+	  deb-systemd-helper unmask 'tailscale.nginx-auth.socket' >/dev/null || true
+	  if deb-systemd-helper --quiet was-enabled 'tailscale.nginx-auth.socket'; then
+		    deb-systemd-helper enable 'tailscale.nginx-auth.socket' >/dev/null || true
+	  else
+		    deb-systemd-helper update-state 'tailscale.nginx-auth.socket' >/dev/null || true
+	  fi
+
+    if systemctl is-active tailscale.nginx-auth.socket >/dev/null; then
+        systemctl --system daemon-reload >/dev/null || true
+        deb-systemd-invoke stop 'tailscale.nginx-auth.service' >/dev/null || true
+        deb-systemd-invoke restart 'tailscale.nginx-auth.socket' >/dev/null || true
+    fi
+fi

cmd/nginx-auth/deb/postrm.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+set -e
+if [ -d /run/systemd/system ] ; then
+	  systemctl --system daemon-reload >/dev/null || true
+fi
+
+if [ -x "/usr/bin/deb-systemd-helper" ]; then
+    if [ "$1" = "remove" ]; then
+		    deb-systemd-helper mask 'tailscale.nginx-auth.socket' >/dev/null || true
+		    deb-systemd-helper mask 'tailscale.nginx-auth.service' >/dev/null || true
+	  fi
+
+    if [ "$1" = "purge" ]; then
+		    deb-systemd-helper purge 'tailscale.nginx-auth.socket' >/dev/null || true
+		    deb-systemd-helper unmask 'tailscale.nginx-auth.socket' >/dev/null || true
+		    deb-systemd-helper purge 'tailscale.nginx-auth.service' >/dev/null || true
+		    deb-systemd-helper unmask 'tailscale.nginx-auth.service' >/dev/null || true
+	  fi
+fi

cmd/nginx-auth/deb/prerm.sh

@@ -0,0 +1,8 @@
+#!/bin/sh
+set -e
+if [ "$1" = "remove" ]; then
+	  if [ -d /run/systemd/system ]; then
+		    deb-systemd-invoke stop 'tailscale.nginx-auth.service' >/dev/null || true
+		    deb-systemd-invoke stop 'tailscale.nginx-auth.socket' >/dev/null || true
+	  fi
+fi

cmd/nginx-auth/mkdeb.sh

@@ -4,20 +4,28 @@ set -e
 
 CGO_ENABLED=0 GOARCH=amd64 GOOS=linux go build -o tailscale.nginx-auth .
 
-mkpkg \
-    --out tailscale-nginx-auth-0.1.0-amd64.deb \
-    --name=tailscale-nginx-auth \
-    --version=0.1.0 \
-    --type=deb\
-    --arch=amd64 \
-    --description="Tailscale NGINX authentication protocol handler" \
-    --files=./tailscale.nginx-auth:/usr/sbin/tailscale.nginx-auth,./tailscale.nginx-auth.socket:/lib/systemd/system/tailscale.nginx-auth.socket,./tailscale.nginx-auth.service:/lib/systemd/system/tailscale.nginx-auth.service
+VERSION=0.1.1
 
 mkpkg \
-    --out tailscale-nginx-auth-0.1.0-amd64.rpm \
+    --out=tailscale-nginx-auth-${VERSION}-amd64.deb \
     --name=tailscale-nginx-auth \
-    --version=0.1.0 \
+    --version=${VERSION} \
+    --type=deb \
+    --arch=amd64 \
+    --postinst=deb/postinst.sh \
+    --postrm=deb/postrm.sh \
+    --prerm=deb/prerm.sh \
+    --description="Tailscale NGINX authentication protocol handler" \
+    --files=./tailscale.nginx-auth:/usr/sbin/tailscale.nginx-auth,./tailscale.nginx-auth.socket:/lib/systemd/system/tailscale.nginx-auth.socket,./tailscale.nginx-auth.service:/lib/systemd/system/tailscale.nginx-auth.service,./README.md:/usr/share/tailscale/nginx-auth/README.md
+
+mkpkg \
+    --out=tailscale-nginx-auth-${VERSION}-amd64.rpm \
+    --name=tailscale-nginx-auth \
+    --version=${VERSION} \
     --type=rpm \
     --arch=amd64 \
+    --postinst=rpm/postinst.sh \
+    --postrm=rpm/postrm.sh \
+    --prerm=rpm/prerm.sh \
     --description="Tailscale NGINX authentication protocol handler" \
-    --files=./tailscale.nginx-auth:/usr/sbin/tailscale.nginx-auth,./tailscale.nginx-auth.socket:/lib/systemd/system/tailscale.nginx-auth.socket,./tailscale.nginx-auth.service:/lib/systemd/system/tailscale.nginx-auth.service
+    --files=./tailscale.nginx-auth:/usr/sbin/tailscale.nginx-auth,./tailscale.nginx-auth.socket:/lib/systemd/system/tailscale.nginx-auth.socket,./tailscale.nginx-auth.service:/lib/systemd/system/tailscale.nginx-auth.service,./README.md:/usr/share/tailscale/nginx-auth/README.md

cmd/nginx-auth/nginx-auth.go

@@ -17,6 +17,7 @@ import (
 	"net"
 	"net/http"
 	"net/netip"
+	"net/url"
 	"os"
 	"strings"
 
@@ -75,6 +76,12 @@ func main() {
 			return
 		}
 
+		if expectedTailnet := r.Header.Get("Expected-Tailnet"); expectedTailnet != "" && expectedTailnet != tailnet {
+			w.WriteHeader(http.StatusForbidden)
+			log.Printf("user is part of tailnet %s, wanted: %s", tailnet, url.QueryEscape(expectedTailnet))
+			return
+		}
+
 		h := w.Header()
 		h.Set("Tailscale-Login", strings.Split(info.UserProfile.LoginName, "@")[0])
 		h.Set("Tailscale-User", info.UserProfile.LoginName)

cmd/nginx-auth/rpm/postrm.sh

@@ -0,0 +1,9 @@
+# $1 == 0 for uninstallation.
+# $1 == 1 for removing old package during upgrade.
+
+systemctl daemon-reload >/dev/null 2>&1 || :
+if [ $1 -ge 1 ] ; then
+    # Package upgrade, not uninstall
+    systemctl stop tailscale.nginx-auth.service >/dev/null 2>&1 || :
+    systemctl try-restart tailscale.nginx-auth.socket >/dev/null 2>&1 || :
+fi

cmd/nginx-auth/rpm/prerm.sh

@@ -0,0 +1,9 @@
+# $1 == 0 for uninstallation.
+# $1 == 1 for removing old package during upgrade.
+
+if [ $1 -eq 0 ] ; then
+    # Package removal, not upgrade
+    systemctl --no-reload disable tailscale.nginx-auth.socket > /dev/null 2>&1 || :
+    systemctl stop tailscale.nginx-auth.socket > /dev/null 2>&1 || :
+    systemctl stop tailscale.nginx-auth.service > /dev/null 2>&1 || :
+fi

cmd/printdep/printdep.go

@@ -19,10 +19,15 @@ import (
 var (
 	goToolchain    = flag.Bool("go", false, "print the supported Go toolchain git hash (a github.com/tailscale/go commit)")
 	goToolchainURL = flag.Bool("go-url", false, "print the URL to the tarball of the Tailscale Go toolchain")
+	alpine         = flag.Bool("alpine", false, "print the tag of alpine docker image")
 )
 
 func main() {
 	flag.Parse()
+	if *alpine {
+		fmt.Println(strings.TrimSpace(ts.AlpineDockerTag))
+		return
+	}
 	if *goToolchain {
 		fmt.Println(strings.TrimSpace(ts.GoToolchainRev))
 	}

cmd/proxy-to-grafana/proxy-to-grafana.go

@@ -62,6 +62,12 @@ func main() {
 		Hostname: *hostname,
 	}
 
+	// TODO(bradfitz,maisem): move this to a method on tsnet.Server probably.
+	if err := ts.Start(); err != nil {
+		log.Fatalf("Error starting tsnet.Server: %v", err)
+	}
+	localClient, _ := ts.LocalClient()
+
 	url, err := url.Parse(fmt.Sprintf("http://%s", *backendAddr))
 	if err != nil {
 		log.Fatalf("couldn't parse backend address: %v", err)
@@ -71,26 +77,27 @@ func main() {
 	originalDirector := proxy.Director
 	proxy.Director = func(req *http.Request) {
 		originalDirector(req)
-		modifyRequest(req)
+		modifyRequest(req, localClient)
 	}
 
 	var ln net.Listener
 	if *useHTTPS {
 		ln, err = ts.Listen("tcp", ":443")
 		ln = tls.NewListener(ln, &tls.Config{
-			GetCertificate: tailscale.GetCertificate,
+			GetCertificate: localClient.GetCertificate,
 		})
 
 		go func() {
 			// wait for tailscale to start before trying to fetch cert names
 			for i := 0; i < 60; i++ {
-				st, err := tailscale.Status(context.Background())
+				st, err := localClient.Status(context.Background())
 				if err != nil {
-					log.Fatal(err)
-				}
-				log.Printf("tailscale status: %v", st.BackendState)
-				if st.BackendState == "Running" {
-					break
+					log.Printf("error retrieving tailscale status; retrying: %v", err)
+				} else {
+					log.Printf("tailscale status: %v", st.BackendState)
+					if st.BackendState == "Running" {
+						break
+					}
 				}
 				time.Sleep(time.Second)
 			}
@@ -99,7 +106,7 @@ func main() {
 			if err != nil {
 				log.Fatal(err)
 			}
-			name, ok := tailscale.ExpandSNIName(context.Background(), *hostname)
+			name, ok := localClient.ExpandSNIName(context.Background(), *hostname)
 			if !ok {
 				log.Fatalf("can't get hostname for https redirect")
 			}
@@ -119,14 +126,14 @@ func main() {
 	log.Fatal(http.Serve(ln, proxy))
 }
 
-func modifyRequest(req *http.Request) {
+func modifyRequest(req *http.Request, localClient *tailscale.LocalClient) {
 	// with enable_login_token set to true, we get a cookie that handles
 	// auth for paths that are not /login
 	if req.URL.Path != "/login" {
 		return
 	}
 
-	user, err := getTailscaleUser(req.Context(), req.RemoteAddr)
+	user, err := getTailscaleUser(req.Context(), localClient, req.RemoteAddr)
 	if err != nil {
 		log.Printf("error getting Tailscale user: %v", err)
 		return
@@ -136,8 +143,8 @@ func modifyRequest(req *http.Request) {
 	req.Header.Set("X-Webauth-Name", user.DisplayName)
 }
 
-func getTailscaleUser(ctx context.Context, ipPort string) (*tailcfg.UserProfile, error) {
-	whois, err := tailscale.WhoIs(ctx, ipPort)
+func getTailscaleUser(ctx context.Context, localClient *tailscale.LocalClient, ipPort string) (*tailcfg.UserProfile, error) {
+	whois, err := localClient.WhoIs(ctx, ipPort)
 	if err != nil {
 		return nil, fmt.Errorf("failed to identify remote host: %w", err)
 	}

cmd/tailscale/cli/bugreport.go

@@ -9,7 +9,6 @@ import (
 	"errors"
 
 	"github.com/peterbourgon/ff/v3/ffcli"
-	"tailscale.com/client/tailscale"
 )
 
 var bugReportCmd = &ffcli.Command{
@@ -28,7 +27,7 @@ func runBugReport(ctx context.Context, args []string) error {
 	default:
 		return errors.New("unknown argumets")
 	}
-	logMarker, err := tailscale.BugReport(ctx, note)
+	logMarker, err := localClient.BugReport(ctx, note)
 	if err != nil {
 		return err
 	}

cmd/tailscale/cli/cert.go

@@ -50,7 +50,7 @@ func runCert(ctx context.Context, args []string) error {
 			},
 			Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 				if r.TLS != nil && !strings.Contains(r.Host, ".") && r.Method == "GET" {
-					if v, ok := tailscale.ExpandSNIName(r.Context(), r.Host); ok {
+					if v, ok := localClient.ExpandSNIName(r.Context(), r.Host); ok {
 						http.Redirect(w, r, "https://"+v+r.URL.Path, http.StatusTemporaryRedirect)
 						return
 					}
@@ -64,7 +64,7 @@ func runCert(ctx context.Context, args []string) error {
 
 	if len(args) != 1 {
 		var hint bytes.Buffer
-		if st, err := tailscale.Status(ctx); err == nil {
+		if st, err := localClient.Status(ctx); err == nil {
 			if st.BackendState != ipn.Running.String() {
 				fmt.Fprintf(&hint, "\nTailscale is not running.\n")
 			} else if len(st.CertDomains) == 0 {

cmd/tailscale/cli/cli.go

@@ -125,8 +125,12 @@ func CleanUpArgs(args []string) []string {
 	return out
 }
 
+var localClient tailscale.LocalClient
+
 // Run runs the CLI. The args do not include the binary name.
 func Run(args []string) (err error) {
+	args = CleanUpArgs(args)
+
 	if len(args) == 1 && (args[0] == "-V" || args[0] == "--version") {
 		args = []string{"version"}
 	}
@@ -193,10 +197,10 @@ change in the future.
 		return err
 	}
 
-	tailscale.TailscaledSocket = rootArgs.socket
+	localClient.Socket = rootArgs.socket
 	rootfs.Visit(func(f *flag.Flag) {
 		if f.Name == "socket" {
-			tailscale.TailscaledSocketSetExplicitly = true
+			localClient.UseSocketOnly = true
 		}
 	})
 

cmd/tailscale/cli/cli_test.go

@@ -493,14 +493,16 @@ func TestCheckForAccidentalSettingReverts(t *testing.T) {
 			if err != nil {
 				t.Fatal(err)
 			}
-			applyImplicitPrefs(newPrefs, tt.curPrefs, tt.curUser)
-			var got string
-			if err := checkForAccidentalSettingReverts(newPrefs, tt.curPrefs, upCheckEnv{
+			upEnv := upCheckEnv{
 				goos:          goos,
 				flagSet:       flagSet,
 				curExitNodeIP: tt.curExitNodeIP,
 				distro:        tt.distro,
-			}); err != nil {
+				user:          tt.curUser,
+			}
+			applyImplicitPrefs(newPrefs, tt.curPrefs, upEnv)
+			var got string
+			if err := checkForAccidentalSettingReverts(newPrefs, tt.curPrefs, upEnv); err != nil {
 				got = err.Error()
 			}
 			if strings.TrimSpace(got) != tt.want {
@@ -664,11 +666,11 @@ func TestPrefsFromUpArgs(t *testing.T) {
 			goos: "linux",
 			args: upArgsT{
 				advertiseRoutes: "fd7a:115c:a1e0:b1a::bb:10.0.0.0/112",
-				netfilterMode: "off",
+				netfilterMode:   "off",
 			},
 			want: &ipn.Prefs{
-				WantRunning:   true,
-				NoSNAT:        true,
+				WantRunning: true,
+				NoSNAT:      true,
 				AdvertiseRoutes: []netaddr.IPPrefix{
 					netaddr.MustParseIPPrefix("fd7a:115c:a1e0:b1a::bb:10.0.0.0/112"),
 				},
@@ -679,7 +681,7 @@ func TestPrefsFromUpArgs(t *testing.T) {
 			goos: "linux",
 			args: upArgsT{
 				advertiseRoutes: "fd7a:115c:a1e0:b1a::/64",
-				netfilterMode: "off",
+				netfilterMode:   "off",
 			},
 			wantErr: "fd7a:115c:a1e0:b1a::/64 4-in-6 prefix must be at least a /96",
 		},
@@ -688,7 +690,7 @@ func TestPrefsFromUpArgs(t *testing.T) {
 			goos: "linux",
 			args: upArgsT{
 				advertiseRoutes: "fd7a:115c:a1e0:b1a:1234:5678::/112",
-				netfilterMode: "off",
+				netfilterMode:   "off",
 			},
 			wantErr: "route fd7a:115c:a1e0:b1a:1234:5678::/112 contains invalid site ID 12345678; must be 0xff or less",
 		},
@@ -784,6 +786,10 @@ func TestUpdatePrefs(t *testing.T) {
 		curPrefs *ipn.Prefs
 		env      upCheckEnv // empty goos means "linux"
 
+		// checkUpdatePrefsMutations, if non-nil, is run with the new prefs after
+		// updatePrefs might've mutated them (from applyImplicitPrefs).
+		checkUpdatePrefsMutations func(t *testing.T, newPrefs *ipn.Prefs)
+
 		wantSimpleUp   bool
 		wantJustEditMP *ipn.MaskedPrefs
 		wantErrSubtr   string
@@ -885,6 +891,28 @@ func TestUpdatePrefs(t *testing.T) {
 			},
 			env: upCheckEnv{backendState: "Running"},
 		},
+		{
+			// Issue 3808: explicitly empty --operator= should clear value.
+			name:  "explicit_empty_operator",
+			flags: []string{"--operator="},
+			curPrefs: &ipn.Prefs{
+				ControlURL:       "https://login.tailscale.com",
+				CorpDNS:          true,
+				AllowSingleHosts: true,
+				NetfilterMode:    preftype.NetfilterOn,
+				OperatorUser:     "somebody",
+			},
+			env: upCheckEnv{user: "somebody", backendState: "Running"},
+			wantJustEditMP: &ipn.MaskedPrefs{
+				OperatorUserSet: true,
+				WantRunningSet:  true,
+			},
+			checkUpdatePrefsMutations: func(t *testing.T, prefs *ipn.Prefs) {
+				if prefs.OperatorUser != "" {
+					t.Errorf("operator sent to backend should be empty; got %q", prefs.OperatorUser)
+				}
+			},
+		},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {
@@ -909,6 +937,9 @@ func TestUpdatePrefs(t *testing.T) {
 				}
 				t.Fatal(err)
 			}
+			if tt.checkUpdatePrefsMutations != nil {
+				tt.checkUpdatePrefsMutations(t, newPrefs)
+			}
 			if simpleUp != tt.wantSimpleUp {
 				t.Fatalf("simpleUp=%v, want %v", simpleUp, tt.wantSimpleUp)
 			}

cmd/tailscale/cli/debug.go

@@ -8,12 +8,15 @@ import (
 	"bufio"
 	"bytes"
 	"context"
+	"encoding/binary"
 	"encoding/json"
 	"errors"
 	"flag"
 	"fmt"
 	"io"
 	"log"
+	"net"
+	"net/http"
 	"os"
 	"runtime"
 	"strconv"
@@ -21,11 +24,15 @@ import (
 	"time"
 
 	"github.com/peterbourgon/ff/v3/ffcli"
-	"tailscale.com/client/tailscale"
+	"inet.af/netaddr"
+	"tailscale.com/control/controlhttp"
 	"tailscale.com/hostinfo"
 	"tailscale.com/ipn"
+	"tailscale.com/net/tsaddr"
 	"tailscale.com/paths"
 	"tailscale.com/safesocket"
+	"tailscale.com/tailcfg"
+	"tailscale.com/types/key"
 )
 
 var debugCmd = &ffcli.Command{
@@ -66,6 +73,11 @@ var debugCmd = &ffcli.Command{
 			Exec:      runEnv,
 			ShortHelp: "print cmd/tailscale environment",
 		},
+		{
+			Name:      "stat",
+			Exec:      runStat,
+			ShortHelp: "stat a file",
+		},
 		{
 			Name:      "hostinfo",
 			Exec:      runHostinfo,
@@ -106,6 +118,22 @@ var debugCmd = &ffcli.Command{
 				return fs
 			})(),
 		},
+		{
+			Name:      "via",
+			Exec:      runVia,
+			ShortHelp: "convert between site-specific IPv4 CIDRs and IPv6 'via' routes",
+		},
+		{
+			Name:      "ts2021",
+			Exec:      runTS2021,
+			ShortHelp: "debug ts2021 protocol connectivity",
+			FlagSet: (func() *flag.FlagSet {
+				fs := newFlagSet("ts2021")
+				fs.StringVar(&ts2021Args.host, "host", "controlplane.tailscale.com", "hostname of control plane")
+				fs.IntVar(&ts2021Args.version, "version", int(tailcfg.CurrentCapabilityVersion), "protocol version")
+				return fs
+			})(),
+		},
 	},
 }
 
@@ -142,7 +170,7 @@ func runDebug(ctx context.Context, args []string) error {
 	if out := debugArgs.cpuFile; out != "" {
 		usedFlag = true // TODO(bradfitz): add "profile" subcommand
 		log.Printf("Capturing CPU profile for %v seconds ...", debugArgs.cpuSec)
-		if v, err := tailscale.Profile(ctx, "profile", debugArgs.cpuSec); err != nil {
+		if v, err := localClient.Profile(ctx, "profile", debugArgs.cpuSec); err != nil {
 			return err
 		} else {
 			if err := writeProfile(out, v); err != nil {
@@ -154,7 +182,7 @@ func runDebug(ctx context.Context, args []string) error {
 	if out := debugArgs.memFile; out != "" {
 		usedFlag = true // TODO(bradfitz): add "profile" subcommand
 		log.Printf("Capturing memory profile ...")
-		if v, err := tailscale.Profile(ctx, "heap", 0); err != nil {
+		if v, err := localClient.Profile(ctx, "heap", 0); err != nil {
 			return err
 		} else {
 			if err := writeProfile(out, v); err != nil {
@@ -166,7 +194,7 @@ func runDebug(ctx context.Context, args []string) error {
 	if debugArgs.file != "" {
 		usedFlag = true // TODO(bradfitz): add "file" subcommand
 		if debugArgs.file == "get" {
-			wfs, err := tailscale.WaitingFiles(ctx)
+			wfs, err := localClient.WaitingFiles(ctx)
 			if err != nil {
 				fatalf("%v\n", err)
 			}
@@ -177,9 +205,9 @@ func runDebug(ctx context.Context, args []string) error {
 		}
 		delete := strings.HasPrefix(debugArgs.file, "delete:")
 		if delete {
-			return tailscale.DeleteWaitingFile(ctx, strings.TrimPrefix(debugArgs.file, "delete:"))
+			return localClient.DeleteWaitingFile(ctx, strings.TrimPrefix(debugArgs.file, "delete:"))
 		}
-		rc, size, err := tailscale.GetWaitingFile(ctx, debugArgs.file)
+		rc, size, err := localClient.GetWaitingFile(ctx, debugArgs.file)
 		if err != nil {
 			return err
 		}
@@ -214,7 +242,7 @@ var prefsArgs struct {
 }
 
 func runPrefs(ctx context.Context, args []string) error {
-	prefs, err := tailscale.GetPrefs(ctx)
+	prefs, err := localClient.GetPrefs(ctx)
 	if err != nil {
 		return err
 	}
@@ -248,7 +276,7 @@ func runWatchIPN(ctx context.Context, args []string) error {
 }
 
 func runDERPMap(ctx context.Context, args []string) error {
-	dm, err := tailscale.CurrentDERPMap(ctx)
+	dm, err := localClient.CurrentDERPMap(ctx)
 	if err != nil {
 		return fmt.Errorf(
 			"failed to get local derp map, instead `curl %s/derpmap/default`: %w", ipn.DefaultControlURL, err,
@@ -265,7 +293,7 @@ func localAPIAction(action string) func(context.Context, []string) error {
 		if len(args) > 0 {
 			return errors.New("unexpected arguments")
 		}
-		return tailscale.DebugAction(ctx, action)
+		return localClient.DebugAction(ctx, action)
 	}
 }
 
@@ -276,6 +304,28 @@ func runEnv(ctx context.Context, args []string) error {
 	return nil
 }
 
+func runStat(ctx context.Context, args []string) error {
+	for _, a := range args {
+		fi, err := os.Lstat(a)
+		if err != nil {
+			fmt.Printf("%s: %v\n", a, err)
+			continue
+		}
+		fmt.Printf("%s: %v, %v\n", a, fi.Mode(), fi.Size())
+		if fi.IsDir() {
+			ents, _ := os.ReadDir(a)
+			for i, ent := range ents {
+				if i == 25 {
+					fmt.Printf("  ...\n")
+					break
+				}
+				fmt.Printf("  - %s\n", ent.Name())
+			}
+		}
+	}
+	return nil
+}
+
 func runHostinfo(ctx context.Context, args []string) error {
 	hi := hostinfo.New()
 	j, _ := json.MarshalIndent(hi, "", "  ")
@@ -284,7 +334,7 @@ func runHostinfo(ctx context.Context, args []string) error {
 }
 
 func runDaemonGoroutines(ctx context.Context, args []string) error {
-	goroutines, err := tailscale.Goroutines(ctx)
+	goroutines, err := localClient.Goroutines(ctx)
 	if err != nil {
 		return err
 	}
@@ -299,7 +349,7 @@ var metricsArgs struct {
 func runDaemonMetrics(ctx context.Context, args []string) error {
 	last := map[string]int64{}
 	for {
-		out, err := tailscale.DaemonMetrics(ctx)
+		out, err := localClient.DaemonMetrics(ctx)
 		if err != nil {
 			return err
 		}
@@ -348,3 +398,110 @@ func runDaemonMetrics(ctx context.Context, args []string) error {
 		time.Sleep(time.Second)
 	}
 }
+
+func runVia(ctx context.Context, args []string) error {
+	switch len(args) {
+	default:
+		return errors.New("expect either <site-id> <v4-cidr> or <v6-route>")
+	case 1:
+		ipp, err := netaddr.ParseIPPrefix(args[0])
+		if err != nil {
+			return err
+		}
+		if !ipp.IP().Is6() {
+			return errors.New("with one argument, expect an IPv6 CIDR")
+		}
+		if !tsaddr.TailscaleViaRange().Contains(ipp.IP()) {
+			return errors.New("not a via route")
+		}
+		if ipp.Bits() < 96 {
+			return errors.New("short length, want /96 or more")
+		}
+		v4 := tsaddr.UnmapVia(ipp.IP())
+		a := ipp.IP().As16()
+		siteID := binary.BigEndian.Uint32(a[8:12])
+		fmt.Printf("site %v (0x%x), %v\n", siteID, siteID, netaddr.IPPrefixFrom(v4, ipp.Bits()-96))
+	case 2:
+		siteID, err := strconv.ParseUint(args[0], 0, 32)
+		if err != nil {
+			return fmt.Errorf("invalid site-id %q; must be decimal or hex with 0x prefix", args[0])
+		}
+		if siteID > 0xff {
+			return fmt.Errorf("site-id values over 255 are currently reserved")
+		}
+		ipp, err := netaddr.ParseIPPrefix(args[1])
+		if err != nil {
+			return err
+		}
+		via, err := tsaddr.MapVia(uint32(siteID), ipp)
+		if err != nil {
+			return err
+		}
+		fmt.Println(via)
+	}
+	return nil
+}
+
+var ts2021Args struct {
+	host    string // "controlplane.tailscale.com"
+	version int    // 27 or whatever
+}
+
+func runTS2021(ctx context.Context, args []string) error {
+	log.SetOutput(os.Stdout)
+	log.SetFlags(log.Ltime | log.Lmicroseconds)
+
+	machinePrivate := key.NewMachine()
+	var dialer net.Dialer
+
+	var keys struct {
+		PublicKey key.MachinePublic
+	}
+	keysURL := "https://" + ts2021Args.host + "/key?v=" + strconv.Itoa(ts2021Args.version)
+	log.Printf("Fetching keys from %s ...", keysURL)
+	req, err := http.NewRequestWithContext(ctx, "GET", keysURL, nil)
+	if err != nil {
+		return err
+	}
+	res, err := http.DefaultClient.Do(req)
+	if err != nil {
+		log.Printf("Do: %v", err)
+		return err
+	}
+	if res.StatusCode != 200 {
+		log.Printf("Status: %v", res.Status)
+		return errors.New(res.Status)
+	}
+	if err := json.NewDecoder(res.Body).Decode(&keys); err != nil {
+		log.Printf("JSON: %v", err)
+		return fmt.Errorf("decoding /keys JSON: %w", err)
+	}
+	res.Body.Close()
+
+	dialFunc := func(ctx context.Context, network, address string) (net.Conn, error) {
+		log.Printf("Dial(%q, %q) ...", network, address)
+		c, err := dialer.DialContext(ctx, network, address)
+		if err != nil {
+			log.Printf("Dial(%q, %q) = %v", network, address, err)
+		} else {
+			log.Printf("Dial(%q, %q) = %v / %v", network, address, c.LocalAddr(), c.RemoteAddr())
+		}
+		return c, err
+	}
+
+	conn, err := controlhttp.Dial(ctx, net.JoinHostPort(ts2021Args.host, "80"), machinePrivate, keys.PublicKey, uint16(ts2021Args.version), dialFunc)
+	log.Printf("controlhttp.Dial = %p, %v", conn, err)
+	if err != nil {
+		return err
+	}
+	log.Printf("did noise handshake")
+
+	gotPeer := conn.Peer()
+	if gotPeer != keys.PublicKey {
+		log.Printf("peer = %v, want %v", gotPeer, keys.PublicKey)
+		return errors.New("key mismatch")
+	}
+
+	log.Printf("final underlying conn: %v / %v", conn.LocalAddr(), conn.RemoteAddr())
+	return nil
+}

cmd/tailscale/cli/down.go

@@ -6,10 +6,10 @@ package cli
 
 import (
 	"context"
+	"flag"
 	"fmt"
 
 	"github.com/peterbourgon/ff/v3/ffcli"
-	"tailscale.com/client/tailscale"
 	"tailscale.com/ipn"
 )
 
@@ -18,7 +18,14 @@ var downCmd = &ffcli.Command{
 	ShortUsage: "down",
 	ShortHelp:  "Disconnect from Tailscale",
 
-	Exec: runDown,
+	Exec:    runDown,
+	FlagSet: newDownFlagSet(),
+}
+
+func newDownFlagSet() *flag.FlagSet {
+	downf := newFlagSet("down")
+	registerAcceptRiskFlag(downf)
+	return downf
 }
 
 func runDown(ctx context.Context, args []string) error {
@@ -26,7 +33,13 @@ func runDown(ctx context.Context, args []string) error {
 		return fmt.Errorf("too many non-flag arguments: %q", args)
 	}
 
-	st, err := tailscale.Status(ctx)
+	if isSSHOverTailscale() {
+		if err := presentRiskToUser(riskLoseSSH, `You are connected over Tailscale; this action will disable Tailscale and result in your session disconnecting.`); err != nil {
+			return err
+		}
+	}
+
+	st, err := localClient.Status(ctx)
 	if err != nil {
 		return fmt.Errorf("error fetching current status: %w", err)
 	}
@@ -34,7 +47,7 @@ func runDown(ctx context.Context, args []string) error {
 		fmt.Fprintf(Stderr, "Tailscale was already stopped.\n")
 		return nil
 	}
-	_, err = tailscale.EditPrefs(ctx, &ipn.MaskedPrefs{
+	_, err = localClient.EditPrefs(ctx, &ipn.MaskedPrefs{
 		Prefs: ipn.Prefs{
 			WantRunning: false,
 		},

cmd/tailscale/cli/file.go

@@ -24,7 +24,6 @@ import (
 	"github.com/peterbourgon/ff/v3/ffcli"
 	"golang.org/x/time/rate"
 	"inet.af/netaddr"
-	"tailscale.com/client/tailscale"
 	"tailscale.com/client/tailscale/apitype"
 	"tailscale.com/envknob"
 	"tailscale.com/ipn"
@@ -157,7 +156,7 @@ func runCp(ctx context.Context, args []string) error {
 		if cpArgs.verbose {
 			log.Printf("sending %q to %v/%v/%v ...", name, target, ip, stableID)
 		}
-		err := tailscale.PushFile(ctx, stableID, contentLength, name, fileContents)
+		err := localClient.PushFile(ctx, stableID, contentLength, name, fileContents)
 		if err != nil {
 			return err
 		}
@@ -173,7 +172,7 @@ func getTargetStableID(ctx context.Context, ipStr string) (id tailcfg.StableNode
 	if err != nil {
 		return "", false, err
 	}
-	fts, err := tailscale.FileTargets(ctx)
+	fts, err := localClient.FileTargets(ctx)
 	if err != nil {
 		return "", false, err
 	}
@@ -194,7 +193,7 @@ func getTargetStableID(ctx context.Context, ipStr string) (id tailcfg.StableNode
 // invalid file sharing target.
 func fileTargetErrorDetail(ctx context.Context, ip netaddr.IP) error {
 	found := false
-	if st, err := tailscale.Status(ctx); err == nil && st.Self != nil {
+	if st, err := localClient.Status(ctx); err == nil && st.Self != nil {
 		for _, peer := range st.Peer {
 			for _, pip := range peer.TailscaleIPs {
 				if pip == ip {
@@ -261,7 +260,7 @@ func runCpTargets(ctx context.Context, args []string) error {
 	if len(args) > 0 {
 		return errors.New("invalid arguments with --targets")
 	}
-	fts, err := tailscale.FileTargets(ctx)
+	fts, err := localClient.FileTargets(ctx)
 	if err != nil {
 		return err
 	}
@@ -385,7 +384,7 @@ func openFileOrSubstitute(dir, base string, action onConflict) (*os.File, error)
 }
 
 func receiveFile(ctx context.Context, wf apitype.WaitingFile, dir string) (targetFile string, size int64, err error) {
-	rc, size, err := tailscale.GetWaitingFile(ctx, wf.Name)
+	rc, size, err := localClient.GetWaitingFile(ctx, wf.Name)
 	if err != nil {
 		return "", 0, fmt.Errorf("opening inbox file %q: %w", wf.Name, err)
 	}
@@ -407,7 +406,7 @@ func runFileGetOneBatch(ctx context.Context, dir string) []error {
 	var err error
 	var errs []error
 	for len(errs) == 0 {
-		wfs, err = tailscale.WaitingFiles(ctx)
+		wfs, err = localClient.WaitingFiles(ctx)
 		if err != nil {
 			errs = append(errs, fmt.Errorf("getting WaitingFiles: %w", err))
 			break
@@ -428,7 +427,7 @@ func runFileGetOneBatch(ctx context.Context, dir string) []error {
 		if len(errs) > 100 {
 			// Likely, everything is broken.
 			// Don't try to receive any more files in this batch.
-			errs = append(errs, fmt.Errorf("too many errors in runFileGetOneBatch(). %d files unexamined", len(wfs) - i))
+			errs = append(errs, fmt.Errorf("too many errors in runFileGetOneBatch(). %d files unexamined", len(wfs)-i))
 			break
 		}
 		writtenFile, size, err := receiveFile(ctx, wf, dir)
@@ -439,7 +438,7 @@ func runFileGetOneBatch(ctx context.Context, dir string) []error {
 		if getArgs.verbose {
 			printf("wrote %v as %v (%d bytes)\n", wf.Name, writtenFile, size)
 		}
-		if err = tailscale.DeleteWaitingFile(ctx, wf.Name); err != nil {
+		if err = localClient.DeleteWaitingFile(ctx, wf.Name); err != nil {
 			errs = append(errs, fmt.Errorf("deleting %q from inbox: %v", wf.Name, err))
 			continue
 		}
@@ -503,7 +502,7 @@ func wipeInbox(ctx context.Context) error {
 	if getArgs.wait {
 		return errors.New("can't use --wait with /dev/null target")
 	}
-	wfs, err := tailscale.WaitingFiles(ctx)
+	wfs, err := localClient.WaitingFiles(ctx)
 	if err != nil {
 		return fmt.Errorf("getting WaitingFiles: %w", err)
 	}
@@ -512,7 +511,7 @@ func wipeInbox(ctx context.Context) error {
 		if getArgs.verbose {
 			log.Printf("deleting %v ...", wf.Name)
 		}
-		if err := tailscale.DeleteWaitingFile(ctx, wf.Name); err != nil {
+		if err := localClient.DeleteWaitingFile(ctx, wf.Name); err != nil {
 			return fmt.Errorf("deleting %q: %v", wf.Name, err)
 		}
 		deleted++

cmd/tailscale/cli/id-token.go

@@ -10,7 +10,6 @@ import (
 	"fmt"
 
 	"github.com/peterbourgon/ff/v3/ffcli"
-	"tailscale.com/client/tailscale"
 )
 
 var idTokenCmd = &ffcli.Command{
@@ -25,7 +24,7 @@ func runIDToken(ctx context.Context, args []string) error {
 		return errors.New("usage: id-token <aud>")
 	}
 
-	tr, err := tailscale.IDToken(ctx, args[0])
+	tr, err := localClient.IDToken(ctx, args[0])
 	if err != nil {
 		return err
 	}

cmd/tailscale/cli/ip.go

@@ -12,7 +12,6 @@ import (
 
 	"github.com/peterbourgon/ff/v3/ffcli"
 	"inet.af/netaddr"
-	"tailscale.com/client/tailscale"
 	"tailscale.com/ipn/ipnstate"
 )
 
@@ -59,7 +58,7 @@ func runIP(ctx context.Context, args []string) error {
 	if !v4 && !v6 {
 		v4, v6 = true, true
 	}
-	st, err := tailscale.Status(ctx)
+	st, err := localClient.Status(ctx)
 	if err != nil {
 		return err
 	}

cmd/tailscale/cli/logout.go

@@ -10,7 +10,6 @@ import (
 	"strings"
 
 	"github.com/peterbourgon/ff/v3/ffcli"
-	"tailscale.com/client/tailscale"
 )
 
 var logoutCmd = &ffcli.Command{
@@ -30,5 +29,5 @@ func runLogout(ctx context.Context, args []string) error {
 	if len(args) > 0 {
 		return fmt.Errorf("too many non-flag arguments: %q", args)
 	}
-	return tailscale.Logout(ctx)
+	return localClient.Logout(ctx)
 }

cmd/tailscale/cli/nc.go

@@ -13,7 +13,6 @@ import (
 	"strconv"
 
 	"github.com/peterbourgon/ff/v3/ffcli"
-	"tailscale.com/client/tailscale"
 )
 
 var ncCmd = &ffcli.Command{
@@ -24,7 +23,7 @@ var ncCmd = &ffcli.Command{
 }
 
 func runNC(ctx context.Context, args []string) error {
-	st, err := tailscale.Status(ctx)
+	st, err := localClient.Status(ctx)
 	if err != nil {
 		return fixTailscaledConnectError(err)
 	}
@@ -45,7 +44,7 @@ func runNC(ctx context.Context, args []string) error {
 	}
 
 	// TODO(bradfitz): also add UDP too, via flag?
-	c, err := tailscale.DialTCP(ctx, hostOrIP, uint16(port))
+	c, err := localClient.DialTCP(ctx, hostOrIP, uint16(port))
 	if err != nil {
 		return fmt.Errorf("Dial(%q, %v): %w", hostOrIP, port, err)
 	}

cmd/tailscale/cli/netcheck.go

@@ -18,7 +18,6 @@ import (
 	"time"
 
 	"github.com/peterbourgon/ff/v3/ffcli"
-	"tailscale.com/client/tailscale"
 	"tailscale.com/envknob"
 	"tailscale.com/ipn"
 	"tailscale.com/net/netcheck"
@@ -63,7 +62,7 @@ func runNetcheck(ctx context.Context, args []string) error {
 		fmt.Fprintln(Stderr, "# Warning: this JSON format is not yet considered a stable interface")
 	}
 
-	dm, err := tailscale.CurrentDERPMap(ctx)
+	dm, err := localClient.CurrentDERPMap(ctx)
 	noRegions := dm != nil && len(dm.Regions) == 0
 	if noRegions {
 		log.Printf("No DERP map from tailscaled; using default.")

cmd/tailscale/cli/ping.go

@@ -16,9 +16,9 @@ import (
 	"time"
 
 	"github.com/peterbourgon/ff/v3/ffcli"
-	"tailscale.com/client/tailscale"
-	"tailscale.com/ipn"
+	"inet.af/netaddr"
 	"tailscale.com/ipn/ipnstate"
+	"tailscale.com/tailcfg"
 )
 
 var pingCmd = &ffcli.Command{
@@ -27,7 +27,7 @@ var pingCmd = &ffcli.Command{
 	ShortHelp:  "Ping a host at the Tailscale layer, see how it routed",
 	LongHelp: strings.TrimSpace(`
 
-The 'tailscale ping' command pings a peer node at the Tailscale layer
+The 'tailscale ping' command pings a peer node from the Tailscale layer
 and reports which route it took for each response. The first ping or
 so will likely go over DERP (Tailscale's TCP relay protocol) while NAT
 traversal finds a direct path through.
@@ -49,7 +49,9 @@ relay node.
 		fs := newFlagSet("ping")
 		fs.BoolVar(&pingArgs.verbose, "verbose", false, "verbose output")
 		fs.BoolVar(&pingArgs.untilDirect, "until-direct", true, "stop once a direct path is established")
-		fs.BoolVar(&pingArgs.tsmp, "tsmp", false, "do a TSMP-level ping (through IP + wireguard, but not involving host OS stack)")
+		fs.BoolVar(&pingArgs.tsmp, "tsmp", false, "do a TSMP-level ping (through WireGuard, but not either host OS stack)")
+		fs.BoolVar(&pingArgs.icmp, "icmp", false, "do a ICMP-level ping (through WireGuard, but not the local host OS stack)")
+		fs.BoolVar(&pingArgs.peerAPI, "peerapi", false, "try hitting the peer's peerapi HTTP server")
 		fs.IntVar(&pingArgs.num, "c", 10, "max number of pings to send")
 		fs.DurationVar(&pingArgs.timeout, "timeout", 5*time.Second, "timeout before giving up on a ping")
 		return fs
@@ -61,11 +63,26 @@ var pingArgs struct {
 	untilDirect bool
 	verbose     bool
 	tsmp        bool
+	icmp        bool
+	peerAPI     bool
 	timeout     time.Duration
 }
 
+func pingType() tailcfg.PingType {
+	if pingArgs.tsmp {
+		return tailcfg.PingTSMP
+	}
+	if pingArgs.icmp {
+		return tailcfg.PingICMP
+	}
+	if pingArgs.peerAPI {
+		return tailcfg.PingPeerAPI
+	}
+	return tailcfg.PingDisco
+}
+
 func runPing(ctx context.Context, args []string) error {
-	st, err := tailscale.Status(ctx)
+	st, err := localClient.Status(ctx)
 	if err != nil {
 		return fixTailscaledConnectError(err)
 	}
@@ -75,24 +92,10 @@ func runPing(ctx context.Context, args []string) error {
 		os.Exit(1)
 	}
 
-	c, bc, ctx, cancel := connect(ctx)
-	defer cancel()
-
 	if len(args) != 1 || args[0] == "" {
 		return errors.New("usage: ping <hostname-or-IP>")
 	}
 	var ip string
-	prc := make(chan *ipnstate.PingResult, 1)
-	bc.SetNotifyCallback(func(n ipn.Notify) {
-		if n.ErrMessage != nil {
-			fatalf("Notify.ErrMessage: %v", *n.ErrMessage)
-		}
-		if pr := n.PingResult; pr != nil && pr.IP == ip {
-			prc <- pr
-		}
-	})
-	pumpErr := make(chan error, 1)
-	go func() { pumpErr <- pump(ctx, bc, c) }()
 
 	hostOrIP := args[0]
 	ip, self, err := tailscaleIPFromArg(ctx, hostOrIP)
@@ -112,48 +115,57 @@ func runPing(ctx context.Context, args []string) error {
 	anyPong := false
 	for {
 		n++
-		bc.Ping(ip, pingArgs.tsmp)
-		timer := time.NewTimer(pingArgs.timeout)
-		select {
-		case <-timer.C:
-			printf("timeout waiting for ping reply\n")
-		case err := <-pumpErr:
-			return err
-		case pr := <-prc:
-			timer.Stop()
-			if pr.Err != "" {
-				if pr.IsLocalIP {
-					outln(pr.Err)
+		ctx, cancel := context.WithTimeout(ctx, pingArgs.timeout)
+		pr, err := localClient.Ping(ctx, netaddr.MustParseIP(ip), pingType())
+		cancel()
+		if err != nil {
+			if errors.Is(err, context.DeadlineExceeded) {
+				printf("ping %q timed out\n", ip)
+				if n == pingArgs.num {
+					if !anyPong {
+						return errors.New("no reply")
+					}
 					return nil
 				}
-				return errors.New(pr.Err)
+				continue
 			}
-			latency := time.Duration(pr.LatencySeconds * float64(time.Second)).Round(time.Millisecond)
-			via := pr.Endpoint
-			if pr.DERPRegionID != 0 {
-				via = fmt.Sprintf("DERP(%s)", pr.DERPRegionCode)
-			}
-			if pingArgs.tsmp {
-				// TODO(bradfitz): populate the rest of ipnstate.PingResult for TSMP queries?
-				// For now just say it came via TSMP.
-				via = "TSMP"
-			}
-			anyPong = true
-			extra := ""
-			if pr.PeerAPIPort != 0 {
-				extra = fmt.Sprintf(", %d", pr.PeerAPIPort)
-			}
-			printf("pong from %s (%s%s) via %v in %v\n", pr.NodeName, pr.NodeIP, extra, via, latency)
-			if pingArgs.tsmp {
-				return nil
-			}
-			if pr.Endpoint != "" && pingArgs.untilDirect {
-				return nil
-			}
-			time.Sleep(time.Second)
-		case <-ctx.Done():
-			return ctx.Err()
+			return err
 		}
+		if pr.Err != "" {
+			if pr.IsLocalIP {
+				outln(pr.Err)
+				return nil
+			}
+			return errors.New(pr.Err)
+		}
+		latency := time.Duration(pr.LatencySeconds * float64(time.Second)).Round(time.Millisecond)
+		via := pr.Endpoint
+		if pr.DERPRegionID != 0 {
+			via = fmt.Sprintf("DERP(%s)", pr.DERPRegionCode)
+		}
+		if via == "" {
+			// TODO(bradfitz): populate the rest of ipnstate.PingResult for TSMP queries?
+			// For now just say which protocol it used.
+			via = string(pingType())
+		}
+		if pingArgs.peerAPI {
+			printf("hit peerapi of %s (%s) at %s in %s\n", pr.NodeIP, pr.NodeName, pr.PeerAPIURL, latency)
+			return nil
+		}
+		anyPong = true
+		extra := ""
+		if pr.PeerAPIPort != 0 {
+			extra = fmt.Sprintf(", %d", pr.PeerAPIPort)
+		}
+		printf("pong from %s (%s%s) via %v in %v\n", pr.NodeName, pr.NodeIP, extra, via, latency)
+		if pingArgs.tsmp || pingArgs.icmp {
+			return nil
+		}
+		if pr.Endpoint != "" && pingArgs.untilDirect {
+			return nil
+		}
+		time.Sleep(time.Second)
+
 		if n == pingArgs.num {
 			if !anyPong {
 				return errors.New("no reply")
@@ -173,7 +185,7 @@ func tailscaleIPFromArg(ctx context.Context, hostOrIP string) (ip string, self b
 	}
 
 	// Otherwise, try to resolve it first from the network peer list.
-	st, err := tailscale.Status(ctx)
+	st, err := localClient.Status(ctx)
 	if err != nil {
 		return "", false, err
 	}

cmd/tailscale/cli/risks.go

@@ -0,0 +1,78 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package cli
+
+import (
+	"errors"
+	"flag"
+	"fmt"
+	"os"
+	"os/signal"
+	"strings"
+	"syscall"
+	"time"
+)
+
+var (
+	riskTypes     []string
+	acceptedRisks string
+	riskLoseSSH   = registerRiskType("lose-ssh")
+)
+
+func registerRiskType(riskType string) string {
+	riskTypes = append(riskTypes, riskType)
+	return riskType
+}
+
+// registerAcceptRiskFlag registers the --accept-risk flag. Accepted risks are accounted for
+// in presentRiskToUser.
+func registerAcceptRiskFlag(f *flag.FlagSet) {
+	f.StringVar(&acceptedRisks, "accept-risk", "", "accept risk and skip confirmation for risk types: "+strings.Join(riskTypes, ","))
+}
+
+// riskAccepted reports whether riskType is in acceptedRisks.
+func riskAccepted(riskType string) bool {
+	for _, r := range strings.Split(acceptedRisks, ",") {
+		if r == riskType {
+			return true
+		}
+	}
+	return false
+}
+
+var errAborted = errors.New("aborted, no changes made")
+
+// riskAbortTimeSeconds is the number of seconds to wait after displaying the
+// risk message before continuing with the operation.
+// It is used by the presentRiskToUser function below.
+const riskAbortTimeSeconds = 5
+
+// presentRiskToUser displays the risk message and waits for the user to
+// cancel. It returns errorAborted if the user aborts.
+func presentRiskToUser(riskType, riskMessage string) error {
+	if riskAccepted(riskType) {
+		return nil
+	}
+	fmt.Println(riskMessage)
+	fmt.Printf("To skip this warning, use --accept-risk=%s\n", riskType)
+
+	interrupt := make(chan os.Signal, 1)
+	signal.Notify(interrupt, syscall.SIGINT)
+	var msgLen int
+	for left := riskAbortTimeSeconds; left > 0; left-- {
+		msg := fmt.Sprintf("\rContinuing in %d seconds...", left)
+		msgLen = len(msg)
+		fmt.Print(msg)
+		select {
+		case <-interrupt:
+			fmt.Printf("\r%s\r", strings.Repeat(" ", msgLen+1))
+			return errAborted
+		case <-time.After(time.Second):
+			continue
+		}
+	}
+	fmt.Printf("\r%s\r", strings.Repeat(" ", msgLen))
+	return errAborted
+}

cmd/tailscale/cli/ssh.go

@@ -11,19 +11,17 @@ import (
 	"fmt"
 	"log"
 	"os"
-	"os/exec"
 	"os/user"
 	"path/filepath"
 	"runtime"
 	"strings"
-	"syscall"
 
-	"github.com/alessio/shellescape"
 	"github.com/peterbourgon/ff/v3/ffcli"
 	"inet.af/netaddr"
-	"tailscale.com/client/tailscale"
 	"tailscale.com/envknob"
 	"tailscale.com/ipn/ipnstate"
+	"tailscale.com/net/tsaddr"
+	"tailscale.com/version"
 )
 
 var sshCmd = &ffcli.Command{
@@ -34,6 +32,9 @@ var sshCmd = &ffcli.Command{
 }
 
 func runSSH(ctx context.Context, args []string) error {
+	if runtime.GOOS == "darwin" && version.IsSandboxedMacOS() && !envknob.UseWIPCode() {
+		return errors.New("The 'tailscale ssh' subcommand is not available on sandboxed macOS builds.\nUse the regular 'ssh' client instead.")
+	}
 	if len(args) == 0 {
 		return errors.New("usage: ssh [user@]<host>")
 	}
@@ -48,7 +49,7 @@ func runSSH(ctx context.Context, args []string) error {
 		username = lu.Username
 	}
 
-	st, err := tailscale.Status(ctx)
+	st, err := localClient.Status(ctx)
 	if err != nil {
 		return err
 	}
@@ -61,7 +62,7 @@ func runSSH(ctx context.Context, args []string) error {
 		hostForSSH = v
 	}
 
-	ssh, err := exec.LookPath("ssh")
+	ssh, err := findSSH()
 	if err != nil {
 		// TODO(bradfitz): use Go's crypto/ssh client instead
 		// of failing. But for now:
@@ -76,51 +77,49 @@ func runSSH(ctx context.Context, args []string) error {
 		return err
 	}
 
-	argv := append([]string{
-		ssh,
+	argv := []string{ssh}
 
-		"-o", fmt.Sprintf("UserKnownHostsFile %s",
-			shellescape.Quote(knownHostsFile),
-		),
-		"-o", fmt.Sprintf("ProxyCommand %s --socket=%s nc %%h %%p",
-			shellescape.Quote(tailscaleBin),
-			shellescape.Quote(rootArgs.socket),
-		),
-
-		// Explicitly rebuild the user@host argument rather than
-		// passing it through.  In general, the use of OpenSSH's ssh
-		// binary is a crutch for now.  We don't want to be
-		// Hyrum-locked into passing through all OpenSSH flags to the
-		// OpenSSH client forever. We try to make our flags and args
-		// be compatible, but only a subset. The "tailscale ssh"
-		// command should be a simple and portable one. If they want
-		// to use a different one, we'll later be making stock ssh
-		// work well by default too. (doing things like automatically
-		// setting known_hosts, etc)
-		username + "@" + hostForSSH,
-	}, argRest...)
-
-	if runtime.GOOS == "windows" {
-		// Don't use syscall.Exec on Windows.
-		cmd := exec.Command(ssh, argv[1:]...)
-		cmd.Stderr = os.Stderr
-		cmd.Stdout = os.Stdout
-		cmd.Stderr = os.Stderr
-		var ee *exec.ExitError
-		err := cmd.Run()
-		if errors.As(err, &ee) {
-			os.Exit(ee.ExitCode())
-		}
-		return err
+	if envknob.Bool("TS_DEBUG_SSH_EXEC") {
+		argv = append(argv, "-vvv")
 	}
+	argv = append(argv,
+		// Only trust SSH hosts that we know about.
+		"-o", fmt.Sprintf("UserKnownHostsFile %q", knownHostsFile),
+		"-o", "UpdateHostKeys no",
+		"-o", "StrictHostKeyChecking yes",
+	)
+
+	// TODO(bradfitz): nc is currently broken on macOS:
+	// https://github.com/tailscale/tailscale/issues/4529
+	// So don't use it for now. MagicDNS is usually working on macOS anyway
+	// and they're not in userspace mode, so 'nc' isn't very useful.
+	if runtime.GOOS != "darwin" {
+		argv = append(argv,
+			"-o", fmt.Sprintf("ProxyCommand %q --socket=%q nc %%h %%p",
+				tailscaleBin,
+				rootArgs.socket,
+			))
+	}
+
+	// Explicitly rebuild the user@host argument rather than
+	// passing it through.  In general, the use of OpenSSH's ssh
+	// binary is a crutch for now.  We don't want to be
+	// Hyrum-locked into passing through all OpenSSH flags to the
+	// OpenSSH client forever. We try to make our flags and args
+	// be compatible, but only a subset. The "tailscale ssh"
+	// command should be a simple and portable one. If they want
+	// to use a different one, we'll later be making stock ssh
+	// work well by default too. (doing things like automatically
+	// setting known_hosts, etc)
+	argv = append(argv, username+"@"+hostForSSH)
+
+	argv = append(argv, argRest...)
 
 	if envknob.Bool("TS_DEBUG_SSH_EXEC") {
 		log.Printf("Running: %q, %q ...", ssh, argv)
 	}
-	if err := syscall.Exec(ssh, argv, os.Environ()); err != nil {
-		return err
-	}
-	return errors.New("unreachable")
+
+	return execSSH(ssh, argv)
 }
 
 func writeKnownHosts(st *ipnstate.Status) (knownHostsFile string, err error) {
@@ -184,3 +183,28 @@ func nodeDNSNameFromArg(st *ipnstate.Status, arg string) (dnsName string, ok boo
 	}
 	return "", false
 }
+
+// getSSHClientEnvVar returns the "SSH_CLIENT" environment variable
+// for the current process group, if any.
+var getSSHClientEnvVar = func() string {
+	return ""
+}
+
+// isSSHOverTailscale checks if the invocation is in a SSH session over Tailscale.
+// It is used to detect if the user is about to take an action that might result in them
+// disconnecting from the machine (e.g. disabling SSH)
+func isSSHOverTailscale() bool {
+	sshClient := getSSHClientEnvVar()
+	if sshClient == "" {
+		return false
+	}
+	ipStr, _, ok := strings.Cut(sshClient, " ")
+	if !ok {
+		return false
+	}
+	ip, err := netaddr.ParseIP(ipStr)
+	if err != nil {
+		return false
+	}
+	return tsaddr.IsTailscaleIP(ip)
+}

cmd/tailscale/cli/ssh_exec.go

@@ -0,0 +1,26 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !js && !windows
+// +build !js,!windows
+
+package cli
+
+import (
+	"errors"
+	"os"
+	"os/exec"
+	"syscall"
+)
+
+func findSSH() (string, error) {
+	return exec.LookPath("ssh")
+}
+
+func execSSH(ssh string, argv []string) error {
+	if err := syscall.Exec(ssh, argv, os.Environ()); err != nil {
+		return err
+	}
+	return errors.New("unreachable")
+}

cmd/tailscale/cli/ssh_exec_js.go

@@ -0,0 +1,17 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package cli
+
+import (
+	"errors"
+)
+
+func findSSH() (string, error) {
+	return "", errors.New("Not implemented")
+}
+
+func execSSH(ssh string, argv []string) error {
+	return errors.New("Not implemented")
+}

cmd/tailscale/cli/ssh_exec_windows.go

@@ -0,0 +1,38 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package cli
+
+import (
+	"errors"
+	"os"
+	"os/exec"
+	"path/filepath"
+)
+
+func findSSH() (string, error) {
+	// use C:\Windows\System32\OpenSSH\ssh.exe since unexpected behavior
+	// occured with ssh.exe provided by msys2/cygwin and other environments.
+	if systemRoot := os.Getenv("SystemRoot"); systemRoot != "" {
+		exe := filepath.Join(systemRoot, "System32", "OpenSSH", "ssh.exe")
+		if st, err := os.Stat(exe); err == nil && !st.IsDir() {
+			return exe, nil
+		}
+	}
+	return exec.LookPath("ssh")
+}
+
+func execSSH(ssh string, argv []string) error {
+	// Don't use syscall.Exec on Windows, it's not fully implemented.
+	cmd := exec.Command(ssh, argv[1:]...)
+	cmd.Stdin = os.Stdin
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	var ee *exec.ExitError
+	err := cmd.Run()
+	if errors.As(err, &ee) {
+		os.Exit(ee.ExitCode())
+	}
+	return err
+}

cmd/tailscale/cli/ssh_unix.go

@@ -0,0 +1,51 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build !js && !windows
+// +build !js,!windows
+
+package cli
+
+import (
+	"bytes"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strconv"
+
+	"golang.org/x/sys/unix"
+)
+
+func init() {
+	getSSHClientEnvVar = func() string {
+		if os.Getenv("SUDO_USER") == "" {
+			// No sudo, just check the env.
+			return os.Getenv("SSH_CLIENT")
+		}
+		if runtime.GOOS != "linux" {
+			// TODO(maisem): implement this for other platforms. It's not clear
+			// if there is a way to get the environment for a given process on
+			// darwin and bsd.
+			return ""
+		}
+		// SID is the session ID of the user's login session.
+		// It is also the process ID of the original shell that the user logged in with.
+		// We only need to check the environment of that process.
+		sid, err := unix.Getsid(os.Getpid())
+		if err != nil {
+			return ""
+		}
+		b, err := os.ReadFile(filepath.Join("/proc", strconv.Itoa(sid), "environ"))
+		if err != nil {
+			return ""
+		}
+		prefix := []byte("SSH_CLIENT=")
+		for _, env := range bytes.Split(b, []byte{0}) {
+			if bytes.HasPrefix(env, prefix) {
+				return string(env[len(prefix):])
+			}
+		}
+		return ""
+	}
+}

cmd/tailscale/cli/status.go

@@ -19,7 +19,6 @@ import (
 	"github.com/peterbourgon/ff/v3/ffcli"
 	"github.com/toqueteos/webbrowser"
 	"inet.af/netaddr"
-	"tailscale.com/client/tailscale"
 	"tailscale.com/ipn"
 	"tailscale.com/ipn/ipnstate"
 	"tailscale.com/net/interfaces"
@@ -73,9 +72,9 @@ func runStatus(ctx context.Context, args []string) error {
 	if len(args) > 0 {
 		return errors.New("unexpected non-flag arguments to 'tailscale status'")
 	}
-	getStatus := tailscale.Status
+	getStatus := localClient.Status
 	if !statusArgs.peers {
-		getStatus = tailscale.StatusWithoutPeers
+		getStatus = localClient.StatusWithoutPeers
 	}
 	st, err := getStatus(ctx)
 	if err != nil {
@@ -115,7 +114,7 @@ func runStatus(ctx context.Context, args []string) error {
 				http.NotFound(w, r)
 				return
 			}
-			st, err := tailscale.Status(ctx)
+			st, err := localClient.Status(ctx)
 			if err != nil {
 				http.Error(w, err.Error(), 500)
 				return
@@ -129,12 +128,8 @@ func runStatus(ctx context.Context, args []string) error {
 		return err
 	}
 
-	description, ok := isRunningOrStarting(st)
-	if !ok {
-		outln(description)
-		os.Exit(1)
-	}
-
+	// print health check information prior to checking LocalBackend state as
+	// it may provide an explanation to the user if we choose to exit early
 	if len(st.Health) > 0 {
 		printf("# Health check:\n")
 		for _, m := range st.Health {
@@ -143,6 +138,12 @@ func runStatus(ctx context.Context, args []string) error {
 		outln()
 	}
 
+	description, ok := isRunningOrStarting(st)
+	if !ok {
+		outln(description)
+		os.Exit(1)
+	}
+
 	var buf bytes.Buffer
 	f := func(format string, a ...any) { fmt.Fprintf(&buf, format, a...) }
 	printPS := func(ps *ipnstate.PeerStatus) {

cmd/tailscale/cli/up.go

@@ -19,13 +19,12 @@ import (
 	"sort"
 	"strings"
 	"sync"
+	"time"
 
 	shellquote "github.com/kballard/go-shellquote"
 	"github.com/peterbourgon/ff/v3/ffcli"
 	qrcode "github.com/skip2/go-qrcode"
 	"inet.af/netaddr"
-	"tailscale.com/client/tailscale"
-	"tailscale.com/envknob"
 	"tailscale.com/ipn"
 	"tailscale.com/ipn/ipnstate"
 	"tailscale.com/net/tsaddr"
@@ -53,7 +52,7 @@ down").
 If flags are specified, the flags must be the complete set of desired
 settings. An error is returned if any setting would be changed as a
 result of an unspecified flag's default value, unless the --reset flag
-is also used. (The flags --authkey, --force-reauth, and --qr are not
+is also used. (The flags --auth-key, --force-reauth, and --qr are not
 considered settings that need to be re-specified when modifying
 settings.)
 `),
@@ -100,9 +99,7 @@ func newUpFlagSet(goos string, upArgs *upArgsT) *flag.FlagSet {
 	upf.StringVar(&upArgs.exitNodeIP, "exit-node", "", "Tailscale exit node (IP or base name) for internet traffic, or empty string to not use an exit node")
 	upf.BoolVar(&upArgs.exitNodeAllowLANAccess, "exit-node-allow-lan-access", false, "Allow direct access to the local network when routing traffic via an exit node")
 	upf.BoolVar(&upArgs.shieldsUp, "shields-up", false, "don't allow incoming connections")
-	if envknob.UseWIPCode() || inTest() {
-		upf.BoolVar(&upArgs.runSSH, "ssh", false, "run an SSH server, permitting access per tailnet admin's declared policy")
-	}
+	upf.BoolVar(&upArgs.runSSH, "ssh", false, "run an SSH server, permitting access per tailnet admin's declared policy")
 	upf.StringVar(&upArgs.advertiseTags, "advertise-tags", "", "comma-separated ACL tags to request; each must start with \"tag:\" (e.g. \"tag:eng,tag:montreal,tag:ssh\")")
 	upf.StringVar(&upArgs.authKeyOrFile, "auth-key", "", `node authorization key; if it begins with "file:", then it's a path to a file containing the authkey`)
 	upf.StringVar(&upArgs.hostname, "hostname", "", "hostname to use instead of the one provided by the OS")
@@ -118,6 +115,8 @@ func newUpFlagSet(goos string, upArgs *upArgsT) *flag.FlagSet {
 	case "windows":
 		upf.BoolVar(&upArgs.forceDaemon, "unattended", false, "run in \"Unattended Mode\" where Tailscale keeps running even after the current GUI user logs out (Windows-only)")
 	}
+	upf.DurationVar(&upArgs.timeout, "timeout", 0, "maximum amount of time to wait for tailscaled to enter a Running state; default (0s) blocks forever")
+	registerAcceptRiskFlag(upf)
 	return upf
 }
 
@@ -150,6 +149,7 @@ type upArgsT struct {
 	hostname               string
 	opUser                 string
 	json                   bool
+	timeout                time.Duration
 }
 
 func (a upArgsT) getAuthKey() (string, error) {
@@ -362,7 +362,7 @@ func prefsFromUpArgs(upArgs upArgsT, warnf logger.Logf, st *ipnstate.Status, goo
 // without changing any settings.
 func updatePrefs(prefs, curPrefs *ipn.Prefs, env upCheckEnv) (simpleUp bool, justEditMP *ipn.MaskedPrefs, err error) {
 	if !env.upArgs.reset {
-		applyImplicitPrefs(prefs, curPrefs, env.user)
+		applyImplicitPrefs(prefs, curPrefs, env)
 
 		if err := checkForAccidentalSettingReverts(prefs, curPrefs, env); err != nil {
 			return false, nil, err
@@ -404,12 +404,12 @@ func updatePrefs(prefs, curPrefs *ipn.Prefs, env upCheckEnv) (simpleUp bool, jus
 	return simpleUp, justEditMP, nil
 }
 
-func runUp(ctx context.Context, args []string) error {
+func runUp(ctx context.Context, args []string) (retErr error) {
 	if len(args) > 0 {
 		fatalf("too many non-flag arguments: %q", args)
 	}
 
-	st, err := tailscale.Status(ctx)
+	st, err := localClient.Status(ctx)
 	if err != nil {
 		return fixTailscaledConnectError(err)
 	}
@@ -450,12 +450,12 @@ func runUp(ctx context.Context, args []string) error {
 	}
 
 	if len(prefs.AdvertiseRoutes) > 0 {
-		if err := tailscale.CheckIPForwarding(context.Background()); err != nil {
+		if err := localClient.CheckIPForwarding(context.Background()); err != nil {
 			warnf("%v", err)
 		}
 	}
 
-	curPrefs, err := tailscale.GetPrefs(ctx)
+	curPrefs, err := localClient.GetPrefs(ctx)
 	if err != nil {
 		return err
 	}
@@ -469,12 +469,30 @@ func runUp(ctx context.Context, args []string) error {
 		backendState:  st.BackendState,
 		curExitNodeIP: exitNodeIP(curPrefs, st),
 	}
+
+	if upArgs.runSSH != curPrefs.RunSSH && isSSHOverTailscale() {
+		if upArgs.runSSH {
+			err = presentRiskToUser(riskLoseSSH, `You are connected over Tailscale; this action will reroute SSH traffic to Tailscale SSH and will result in your session disconnecting.`)
+		} else {
+			err = presentRiskToUser(riskLoseSSH, `You are connected using Tailscale SSH; this action will result in your session disconnecting.`)
+		}
+		if err != nil {
+			return err
+		}
+	}
+
+	defer func() {
+		if retErr == nil {
+			checkSSHUpWarnings(ctx)
+		}
+	}()
+
 	simpleUp, justEditMP, err := updatePrefs(prefs, curPrefs, env)
 	if err != nil {
 		fatalf("%s", err)
 	}
 	if justEditMP != nil {
-		_, err := tailscale.EditPrefs(ctx, justEditMP)
+		_, err := localClient.EditPrefs(ctx, justEditMP)
 		return err
 	}
 
@@ -585,7 +603,7 @@ func runUp(ctx context.Context, args []string) error {
 	// Special case: bare "tailscale up" means to just start
 	// running, if there's ever been a login.
 	if simpleUp {
-		_, err := tailscale.EditPrefs(ctx, &ipn.MaskedPrefs{
+		_, err := localClient.EditPrefs(ctx, &ipn.MaskedPrefs{
 			Prefs: ipn.Prefs{
 				WantRunning: true,
 			},
@@ -595,6 +613,10 @@ func runUp(ctx context.Context, args []string) error {
 			return err
 		}
 	} else {
+		if err := localClient.CheckPrefs(ctx, prefs); err != nil {
+			return err
+		}
+
 		authKey, err := upArgs.getAuthKey()
 		if err != nil {
 			return err
@@ -632,6 +654,12 @@ func runUp(ctx context.Context, args []string) error {
 	// need to prioritize reads from 'running' if it's
 	// readable; its send does happen before the pump mechanism
 	// shuts down. (Issue 2333)
+	var timeoutCh <-chan time.Time
+	if upArgs.timeout > 0 {
+		timeoutTimer := time.NewTimer(upArgs.timeout)
+		defer timeoutTimer.Stop()
+		timeoutCh = timeoutTimer.C
+	}
 	select {
 	case <-running:
 		return nil
@@ -649,6 +677,30 @@ func runUp(ctx context.Context, args []string) error {
 		default:
 		}
 		return err
+	case <-timeoutCh:
+		return errors.New(`timeout waiting for Tailscale service to enter a Running state; check health with "tailscale status"`)
+	}
+}
+
+func checkSSHUpWarnings(ctx context.Context) {
+	if !upArgs.runSSH {
+		return
+	}
+	st, err := localClient.Status(ctx)
+	if err != nil {
+		// Ignore. Don't spam more.
+		return
+	}
+	if len(st.Health) == 0 {
+		return
+	}
+	if len(st.Health) == 1 && strings.Contains(st.Health[0], "SSH") {
+		printf("%s\n", st.Health[0])
+		return
+	}
+	printf("# Health check:\n")
+	for _, m := range st.Health {
+		printf("    - %s\n", m)
 	}
 }
 
@@ -705,7 +757,7 @@ func addPrefFlagMapping(flagName string, prefNames ...string) {
 // correspond to an ipn.Pref.
 func preflessFlag(flagName string) bool {
 	switch flagName {
-	case "auth-key", "force-reauth", "reset", "qr", "json":
+	case "auth-key", "force-reauth", "reset", "qr", "json", "timeout", "accept-risk":
 		return true
 	}
 	return false
@@ -829,13 +881,20 @@ func checkForAccidentalSettingReverts(newPrefs, curPrefs *ipn.Prefs, env upCheck
 	return errors.New(sb.String())
 }
 
-// applyImplicitPrefs mutates prefs to add implicit preferences. Currently
-// this is just the operator user, which only needs to be set if it doesn't
+// applyImplicitPrefs mutates prefs to add implicit preferences for the user operator.
+// If the operator flag is passed no action is taken, otherwise this only needs to be set if it doesn't
 // match the current user.
 //
 // curUser is os.Getenv("USER"). It's pulled out for testability.
-func applyImplicitPrefs(prefs, oldPrefs *ipn.Prefs, curUser string) {
-	if prefs.OperatorUser == "" && oldPrefs.OperatorUser == curUser {
+func applyImplicitPrefs(prefs, oldPrefs *ipn.Prefs, env upCheckEnv) {
+	explicitOperator := false
+	env.flagSet.Visit(func(f *flag.Flag) {
+		if f.Name == "operator" {
+			explicitOperator = true
+		}
+	})
+
+	if prefs.OperatorUser == "" && oldPrefs.OperatorUser == env.user && !explicitOperator {
 		prefs.OperatorUser = oldPrefs.OperatorUser
 	}
 }

cmd/tailscale/cli/version.go

@@ -10,7 +10,6 @@ import (
 	"fmt"
 
 	"github.com/peterbourgon/ff/v3/ffcli"
-	"tailscale.com/client/tailscale"
 	"tailscale.com/version"
 )
 
@@ -41,7 +40,7 @@ func runVersion(ctx context.Context, args []string) error {
 
 	printf("Client: %s\n", version.String())
 
-	st, err := tailscale.StatusWithoutPeers(ctx)
+	st, err := localClient.StatusWithoutPeers(ctx)
 	if err != nil {
 		return err
 	}

cmd/tailscale/cli/web.go

@@ -28,7 +28,6 @@ import (
 
 	"github.com/peterbourgon/ff/v3/ffcli"
 	"inet.af/netaddr"
-	"tailscale.com/client/tailscale"
 	"tailscale.com/ipn"
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/preftype"
@@ -318,7 +317,7 @@ func webHandler(w http.ResponseWriter, r *http.Request) {
 			json.NewEncoder(w).Encode(mi{"error": err.Error()})
 			return
 		}
-		prefs, err := tailscale.GetPrefs(r.Context())
+		prefs, err := localClient.GetPrefs(r.Context())
 		if err != nil && !postData.Reauthenticate {
 			w.WriteHeader(http.StatusInternalServerError)
 			json.NewEncoder(w).Encode(mi{"error": err.Error()})
@@ -348,12 +347,12 @@ func webHandler(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	st, err := tailscale.Status(r.Context())
+	st, err := localClient.Status(r.Context())
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
 	}
-	prefs, err := tailscale.GetPrefs(r.Context())
+	prefs, err := localClient.GetPrefs(r.Context())
 	if err != nil {
 		http.Error(w, err.Error(), http.StatusInternalServerError)
 		return
@@ -406,7 +405,7 @@ func tailscaleUp(ctx context.Context, prefs *ipn.Prefs, forceReauth bool) (authU
 		prefs.NetfilterMode = preftype.NetfilterOff
 	}
 
-	st, err := tailscale.Status(ctx)
+	st, err := localClient.Status(ctx)
 	if err != nil {
 		return "", fmt.Errorf("can't fetch status: %v", err)
 	}

cmd/tailscale/depaware.txt

@@ -1,6 +1,5 @@
 tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/depaware)
 
-        github.com/alessio/shellescape                               from tailscale.com/cmd/tailscale/cli
    W 💣 github.com/alexbrainman/sspi                                 from github.com/alexbrainman/sspi/negotiate+
    W    github.com/alexbrainman/sspi/internal/common                 from github.com/alexbrainman/sspi/negotiate
    W 💣 github.com/alexbrainman/sspi/negotiate                       from tailscale.com/net/tshttpproxy
@@ -9,7 +8,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
    L 💣 github.com/jsimonetti/rtnetlink                              from tailscale.com/net/interfaces
    L    github.com/jsimonetti/rtnetlink/internal/unix                from github.com/jsimonetti/rtnetlink
         github.com/kballard/go-shellquote                            from tailscale.com/cmd/tailscale/cli
-   L    github.com/klauspost/compress/flate                          from nhooyr.io/websocket
+        github.com/klauspost/compress/flate                          from nhooyr.io/websocket
    L 💣 github.com/mdlayher/netlink                                  from github.com/jsimonetti/rtnetlink+
    L 💣 github.com/mdlayher/netlink/nlenc                            from github.com/jsimonetti/rtnetlink+
    L 💣 github.com/mdlayher/socket                                   from github.com/mdlayher/netlink
@@ -32,39 +31,41 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         go4.org/unsafe/assume-no-moving-gc                           from go4.org/intern
    W 💣 golang.zx2c4.com/wireguard/windows/tunnel/winipcfg           from tailscale.com/net/interfaces+
         inet.af/netaddr                                              from tailscale.com/cmd/tailscale/cli+
-   L    nhooyr.io/websocket                                          from tailscale.com/derp/derphttp+
-   L    nhooyr.io/websocket/internal/errd                            from nhooyr.io/websocket
-   L    nhooyr.io/websocket/internal/xsync                           from nhooyr.io/websocket
+        nhooyr.io/websocket                                          from tailscale.com/derp/derphttp+
+        nhooyr.io/websocket/internal/errd                            from nhooyr.io/websocket
+        nhooyr.io/websocket/internal/xsync                           from nhooyr.io/websocket
         tailscale.com                                                from tailscale.com/version
         tailscale.com/atomicfile                                     from tailscale.com/ipn+
         tailscale.com/client/tailscale                               from tailscale.com/cmd/tailscale/cli+
         tailscale.com/client/tailscale/apitype                       from tailscale.com/cmd/tailscale/cli+
         tailscale.com/cmd/tailscale/cli                              from tailscale.com/cmd/tailscale
+        tailscale.com/control/controlbase                            from tailscale.com/control/controlhttp
+        tailscale.com/control/controlhttp                            from tailscale.com/cmd/tailscale/cli
         tailscale.com/control/controlknobs                           from tailscale.com/net/portmapper
         tailscale.com/derp                                           from tailscale.com/derp/derphttp
         tailscale.com/derp/derphttp                                  from tailscale.com/net/netcheck
-   L    tailscale.com/derp/wsconn                                    from tailscale.com/derp/derphttp
         tailscale.com/disco                                          from tailscale.com/derp
         tailscale.com/envknob                                        from tailscale.com/cmd/tailscale/cli+
         tailscale.com/hostinfo                                       from tailscale.com/net/interfaces+
         tailscale.com/ipn                                            from tailscale.com/cmd/tailscale/cli+
         tailscale.com/ipn/ipnstate                                   from tailscale.com/cmd/tailscale/cli+
      💣 tailscale.com/metrics                                        from tailscale.com/derp
-        tailscale.com/net/dnscache                                   from tailscale.com/derp/derphttp
+        tailscale.com/net/dnscache                                   from tailscale.com/derp/derphttp+
+        tailscale.com/net/dnsfallback                                from tailscale.com/control/controlhttp
         tailscale.com/net/flowtrack                                  from tailscale.com/wgengine/filter+
      💣 tailscale.com/net/interfaces                                 from tailscale.com/cmd/tailscale/cli+
         tailscale.com/net/netcheck                                   from tailscale.com/cmd/tailscale/cli
         tailscale.com/net/neterror                                   from tailscale.com/net/netcheck+
         tailscale.com/net/netknob                                    from tailscale.com/net/netns
         tailscale.com/net/netns                                      from tailscale.com/derp/derphttp+
-        tailscale.com/net/netutil                                    from tailscale.com/client/tailscale
+        tailscale.com/net/netutil                                    from tailscale.com/client/tailscale+
         tailscale.com/net/packet                                     from tailscale.com/wgengine/filter
         tailscale.com/net/portmapper                                 from tailscale.com/net/netcheck+
         tailscale.com/net/stun                                       from tailscale.com/net/netcheck
-        tailscale.com/net/tlsdial                                    from tailscale.com/derp/derphttp
+        tailscale.com/net/tlsdial                                    from tailscale.com/derp/derphttp+
         tailscale.com/net/tsaddr                                     from tailscale.com/net/interfaces+
      💣 tailscale.com/net/tshttpproxy                                from tailscale.com/derp/derphttp+
-     💣 tailscale.com/paths                                          from tailscale.com/cmd/tailscale/cli+
+        tailscale.com/paths                                          from tailscale.com/cmd/tailscale/cli+
         tailscale.com/safesocket                                     from tailscale.com/cmd/tailscale/cli+
         tailscale.com/syncs                                          from tailscale.com/net/interfaces+
         tailscale.com/tailcfg                                        from tailscale.com/cmd/tailscale/cli+
@@ -84,23 +85,25 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         tailscale.com/types/structs                                  from tailscale.com/ipn+
         tailscale.com/types/views                                    from tailscale.com/tailcfg+
         tailscale.com/util/clientmetric                              from tailscale.com/net/netcheck+
+        tailscale.com/util/cloudenv                                  from tailscale.com/net/dnscache+
    W    tailscale.com/util/cmpver                                    from tailscale.com/net/tshttpproxy
         tailscale.com/util/dnsname                                   from tailscale.com/cmd/tailscale/cli+
    W    tailscale.com/util/endian                                    from tailscale.com/net/netns
         tailscale.com/util/groupmember                               from tailscale.com/cmd/tailscale/cli
         tailscale.com/util/lineread                                  from tailscale.com/net/interfaces+
-   W    tailscale.com/util/winutil                                   from tailscale.com/hostinfo
-   W 💣 tailscale.com/util/winutil/vss                               from tailscale.com/util/winutil
+        tailscale.com/util/singleflight                              from tailscale.com/net/dnscache
+   W 💣 tailscale.com/util/winutil                                   from tailscale.com/hostinfo+
         tailscale.com/version                                        from tailscale.com/cmd/tailscale/cli+
         tailscale.com/version/distro                                 from tailscale.com/cmd/tailscale/cli+
         tailscale.com/wgengine/filter                                from tailscale.com/types/netmap
         golang.org/x/crypto/blake2b                                  from golang.org/x/crypto/nacl/box
+        golang.org/x/crypto/blake2s                                  from tailscale.com/control/controlbase
         golang.org/x/crypto/chacha20                                 from golang.org/x/crypto/chacha20poly1305
-        golang.org/x/crypto/chacha20poly1305                         from crypto/tls
+        golang.org/x/crypto/chacha20poly1305                         from crypto/tls+
         golang.org/x/crypto/cryptobyte                               from crypto/ecdsa+
         golang.org/x/crypto/cryptobyte/asn1                          from crypto/ecdsa+
         golang.org/x/crypto/curve25519                               from crypto/tls+
-        golang.org/x/crypto/hkdf                                     from crypto/tls
+        golang.org/x/crypto/hkdf                                     from crypto/tls+
         golang.org/x/crypto/nacl/box                                 from tailscale.com/types/key
         golang.org/x/crypto/nacl/secretbox                           from golang.org/x/crypto/nacl/box
         golang.org/x/crypto/salsa20/salsa                            from golang.org/x/crypto/nacl/box+
@@ -113,7 +116,6 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         golang.org/x/net/proxy                                       from tailscale.com/net/netns
    D    golang.org/x/net/route                                       from net+
         golang.org/x/sync/errgroup                                   from tailscale.com/derp+
-        golang.org/x/sync/singleflight                               from tailscale.com/net/dnscache
         golang.org/x/sys/cpu                                         from golang.org/x/crypto/blake2b+
   LD    golang.org/x/sys/unix                                        from tailscale.com/net/netns+
    W    golang.org/x/sys/windows                                     from golang.org/x/sys/windows/registry+
@@ -200,7 +202,7 @@ tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/dep
         reflect                                                      from crypto/x509+
         regexp                                                       from github.com/tailscale/goupnp/httpu+
         regexp/syntax                                                from regexp
-        runtime/debug                                                from golang.org/x/sync/singleflight+
+        runtime/debug                                                from tailscale.com/util/singleflight+
         sort                                                         from compress/flate+
         strconv                                                      from compress/flate+
         strings                                                      from bufio+

cmd/tailscale/tailscale.go

@@ -17,7 +17,6 @@ import (
 
 func main() {
 	args := os.Args[1:]
-	args = cli.CleanUpArgs(args)
 	if name, _ := os.Executable(); strings.HasSuffix(filepath.Base(name), ".cgi") {
 		args = []string{"web", "-cgi"}
 	}

cmd/tailscaled/depaware.txt

@@ -76,12 +76,15 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
    L 💣 github.com/jsimonetti/rtnetlink                              from tailscale.com/net/interfaces+
    L    github.com/jsimonetti/rtnetlink/internal/unix                from github.com/jsimonetti/rtnetlink
         github.com/klauspost/compress                                from github.com/klauspost/compress/zstd
-   L    github.com/klauspost/compress/flate                          from nhooyr.io/websocket
+        github.com/klauspost/compress/flate                          from nhooyr.io/websocket
         github.com/klauspost/compress/fse                            from github.com/klauspost/compress/huff0
         github.com/klauspost/compress/huff0                          from github.com/klauspost/compress/zstd
+        github.com/klauspost/compress/internal/cpuinfo               from github.com/klauspost/compress/zstd
         github.com/klauspost/compress/internal/snapref               from github.com/klauspost/compress/zstd
         github.com/klauspost/compress/zstd                           from tailscale.com/smallzstd
         github.com/klauspost/compress/zstd/internal/xxhash           from github.com/klauspost/compress/zstd
+        github.com/kortschak/wol                                     from tailscale.com/ipn/ipnlocal
+  LD    github.com/kr/fs                                             from github.com/pkg/sftp
    L    github.com/mdlayher/genetlink                                from tailscale.com/net/tstun
    L 💣 github.com/mdlayher/netlink                                  from github.com/jsimonetti/rtnetlink+
    L 💣 github.com/mdlayher/netlink/nlenc                            from github.com/jsimonetti/rtnetlink+
@@ -89,6 +92,8 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
    L 💣 github.com/mdlayher/socket                                   from github.com/mdlayher/netlink
      💣 github.com/mitchellh/go-ps                                   from tailscale.com/safesocket
    W    github.com/pkg/errors                                        from github.com/tailscale/certstore
+  LD    github.com/pkg/sftp                                          from tailscale.com/ssh/tailssh
+  LD    github.com/pkg/sftp/internal/encoding/ssh/filexfer           from github.com/pkg/sftp
    W 💣 github.com/tailscale/certstore                               from tailscale.com/control/controlclient
   LD    github.com/tailscale/golang-x-crypto/chacha20                from github.com/tailscale/golang-x-crypto/ssh
   LD 💣 github.com/tailscale/golang-x-crypto/internal/subtle         from github.com/tailscale/golang-x-crypto/chacha20
@@ -109,7 +114,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
    L 💣 github.com/vishvananda/netlink/nl                            from github.com/tailscale/netlink
    L    github.com/vishvananda/netns                                 from github.com/tailscale/netlink+
      💣 go4.org/intern                                               from inet.af/netaddr
-     💣 go4.org/mem                                                  from tailscale.com/client/tailscale+
+     💣 go4.org/mem                                                  from tailscale.com/control/controlbase+
         go4.org/unsafe/assume-no-moving-gc                           from go4.org/intern
    W 💣 golang.zx2c4.com/wintun                                      from golang.zx2c4.com/wireguard/tun
      💣 golang.zx2c4.com/wireguard/conn                              from golang.zx2c4.com/wireguard/device+
@@ -136,9 +141,9 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
      💣 gvisor.dev/gvisor/pkg/state                                  from gvisor.dev/gvisor/pkg/atomicbitops+
         gvisor.dev/gvisor/pkg/state/wire                             from gvisor.dev/gvisor/pkg/state
      💣 gvisor.dev/gvisor/pkg/sync                                   from gvisor.dev/gvisor/pkg/linewriter+
-        gvisor.dev/gvisor/pkg/tcpip                                  from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+
+        gvisor.dev/gvisor/pkg/tcpip                                  from gvisor.dev/gvisor/pkg/tcpip/header+
         gvisor.dev/gvisor/pkg/tcpip/adapters/gonet                   from tailscale.com/wgengine/netstack
-     💣 gvisor.dev/gvisor/pkg/tcpip/buffer                           from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+
+     💣 gvisor.dev/gvisor/pkg/tcpip/buffer                           from gvisor.dev/gvisor/pkg/tcpip/header+
         gvisor.dev/gvisor/pkg/tcpip/hash/jenkins                     from gvisor.dev/gvisor/pkg/tcpip/stack+
         gvisor.dev/gvisor/pkg/tcpip/header                           from gvisor.dev/gvisor/pkg/tcpip/header/parse+
         gvisor.dev/gvisor/pkg/tcpip/header/parse                     from gvisor.dev/gvisor/pkg/tcpip/network/ipv4+
@@ -151,44 +156,43 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         gvisor.dev/gvisor/pkg/tcpip/network/ipv6                     from tailscale.com/wgengine/netstack
         gvisor.dev/gvisor/pkg/tcpip/ports                            from gvisor.dev/gvisor/pkg/tcpip/stack+
         gvisor.dev/gvisor/pkg/tcpip/seqnum                           from gvisor.dev/gvisor/pkg/tcpip/header+
-     💣 gvisor.dev/gvisor/pkg/tcpip/stack                            from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+
-        gvisor.dev/gvisor/pkg/tcpip/transport                        from gvisor.dev/gvisor/pkg/tcpip/transport/icmp+
+     💣 gvisor.dev/gvisor/pkg/tcpip/stack                            from gvisor.dev/gvisor/pkg/tcpip/header/parse+
+        gvisor.dev/gvisor/pkg/tcpip/transport                        from gvisor.dev/gvisor/pkg/tcpip/transport/internal/network+
         gvisor.dev/gvisor/pkg/tcpip/transport/icmp                   from tailscale.com/wgengine/netstack
-        gvisor.dev/gvisor/pkg/tcpip/transport/internal/network       from gvisor.dev/gvisor/pkg/tcpip/transport/icmp+
+        gvisor.dev/gvisor/pkg/tcpip/transport/internal/network       from gvisor.dev/gvisor/pkg/tcpip/transport/raw+
         gvisor.dev/gvisor/pkg/tcpip/transport/internal/noop          from gvisor.dev/gvisor/pkg/tcpip/transport/raw
         gvisor.dev/gvisor/pkg/tcpip/transport/packet                 from gvisor.dev/gvisor/pkg/tcpip/transport/raw
-        gvisor.dev/gvisor/pkg/tcpip/transport/raw                    from gvisor.dev/gvisor/pkg/tcpip/transport/icmp+
+        gvisor.dev/gvisor/pkg/tcpip/transport/raw                    from gvisor.dev/gvisor/pkg/tcpip/transport/udp+
      💣 gvisor.dev/gvisor/pkg/tcpip/transport/tcp                    from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+
         gvisor.dev/gvisor/pkg/tcpip/transport/tcpconntrack           from gvisor.dev/gvisor/pkg/tcpip/stack
-        gvisor.dev/gvisor/pkg/tcpip/transport/udp                    from gvisor.dev/gvisor/pkg/tcpip/adapters/gonet+
+        gvisor.dev/gvisor/pkg/tcpip/transport/udp                    from tailscale.com/net/tstun+
         gvisor.dev/gvisor/pkg/waiter                                 from gvisor.dev/gvisor/pkg/context+
-        inet.af/netaddr                                              from inet.af/wf+
+        inet.af/netaddr                                              from tailscale.com/control/controlclient+
         inet.af/peercred                                             from tailscale.com/ipn/ipnserver
    W 💣 inet.af/wf                                                   from tailscale.com/wf
-   L    nhooyr.io/websocket                                          from tailscale.com/derp/derphttp+
-   L    nhooyr.io/websocket/internal/errd                            from nhooyr.io/websocket
-   L    nhooyr.io/websocket/internal/xsync                           from nhooyr.io/websocket
+        nhooyr.io/websocket                                          from tailscale.com/derp/derphttp+
+        nhooyr.io/websocket/internal/errd                            from nhooyr.io/websocket
+        nhooyr.io/websocket/internal/xsync                           from nhooyr.io/websocket
         tailscale.com                                                from tailscale.com/version
         tailscale.com/atomicfile                                     from tailscale.com/ipn+
   LD    tailscale.com/chirp                                          from tailscale.com/cmd/tailscaled
         tailscale.com/client/tailscale                               from tailscale.com/derp
-        tailscale.com/client/tailscale/apitype                       from tailscale.com/client/tailscale+
-        tailscale.com/cmd/tailscaled/childproc                       from tailscale.com/cmd/tailscaled+
+        tailscale.com/client/tailscale/apitype                       from tailscale.com/ipn/ipnlocal+
+        tailscale.com/cmd/tailscaled/childproc                       from tailscale.com/ssh/tailssh+
         tailscale.com/control/controlbase                            from tailscale.com/control/controlclient+
-        tailscale.com/control/controlclient                          from tailscale.com/cmd/tailscaled+
+        tailscale.com/control/controlclient                          from tailscale.com/ipn/ipnlocal+
         tailscale.com/control/controlhttp                            from tailscale.com/control/controlclient
         tailscale.com/control/controlknobs                           from tailscale.com/control/controlclient+
         tailscale.com/derp                                           from tailscale.com/derp/derphttp+
-        tailscale.com/derp/derphttp                                  from tailscale.com/cmd/tailscaled+
-   L    tailscale.com/derp/wsconn                                    from tailscale.com/derp/derphttp
+        tailscale.com/derp/derphttp                                  from tailscale.com/net/netcheck+
         tailscale.com/disco                                          from tailscale.com/derp+
-        tailscale.com/envknob                                        from tailscale.com/cmd/tailscaled+
+        tailscale.com/envknob                                        from tailscale.com/control/controlclient+
         tailscale.com/health                                         from tailscale.com/control/controlclient+
         tailscale.com/hostinfo                                       from tailscale.com/control/controlclient+
-        tailscale.com/ipn                                            from tailscale.com/client/tailscale+
-        tailscale.com/ipn/ipnlocal                                   from tailscale.com/ipn/ipnserver+
+        tailscale.com/ipn                                            from tailscale.com/ipn/ipnlocal+
+        tailscale.com/ipn/ipnlocal                                   from tailscale.com/ssh/tailssh+
         tailscale.com/ipn/ipnserver                                  from tailscale.com/cmd/tailscaled
-        tailscale.com/ipn/ipnstate                                   from tailscale.com/client/tailscale+
+        tailscale.com/ipn/ipnstate                                   from tailscale.com/control/controlclient+
         tailscale.com/ipn/localapi                                   from tailscale.com/ipn/ipnserver
         tailscale.com/ipn/policy                                     from tailscale.com/ipn/ipnlocal
         tailscale.com/ipn/store                                      from tailscale.com/cmd/tailscaled
@@ -199,41 +203,41 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/log/filelogger                                 from tailscale.com/logpolicy
         tailscale.com/log/logheap                                    from tailscale.com/control/controlclient
         tailscale.com/logpolicy                                      from tailscale.com/cmd/tailscaled+
-        tailscale.com/logtail                                        from tailscale.com/cmd/tailscaled+
-        tailscale.com/logtail/backoff                                from tailscale.com/cmd/tailscaled+
+        tailscale.com/logtail                                        from tailscale.com/control/controlclient+
+        tailscale.com/logtail/backoff                                from tailscale.com/control/controlclient+
         tailscale.com/logtail/filch                                  from tailscale.com/logpolicy
      💣 tailscale.com/metrics                                        from tailscale.com/derp+
-        tailscale.com/net/dns                                        from tailscale.com/cmd/tailscaled+
+        tailscale.com/net/dns                                        from tailscale.com/ipn/ipnlocal+
         tailscale.com/net/dns/publicdns                              from tailscale.com/net/dns/resolver
         tailscale.com/net/dns/resolvconffile                         from tailscale.com/net/dns+
         tailscale.com/net/dns/resolver                               from tailscale.com/ipn/ipnlocal+
         tailscale.com/net/dnscache                                   from tailscale.com/control/controlclient+
         tailscale.com/net/dnsfallback                                from tailscale.com/control/controlclient+
         tailscale.com/net/flowtrack                                  from tailscale.com/net/packet+
-     💣 tailscale.com/net/interfaces                                 from tailscale.com/cmd/tailscaled+
+     💣 tailscale.com/net/interfaces                                 from tailscale.com/control/controlclient+
         tailscale.com/net/netcheck                                   from tailscale.com/wgengine/magicsock
         tailscale.com/net/neterror                                   from tailscale.com/net/dns/resolver+
-        tailscale.com/net/netknob                                    from tailscale.com/logpolicy+
-        tailscale.com/net/netns                                      from tailscale.com/cmd/tailscaled+
+        tailscale.com/net/netknob                                    from tailscale.com/net/netns+
+        tailscale.com/net/netns                                      from tailscale.com/derp/derphttp+
      💣 tailscale.com/net/netstat                                    from tailscale.com/ipn/ipnserver
         tailscale.com/net/netutil                                    from tailscale.com/ipn/ipnlocal+
         tailscale.com/net/packet                                     from tailscale.com/net/tstun+
-        tailscale.com/net/portmapper                                 from tailscale.com/cmd/tailscaled+
+        tailscale.com/net/portmapper                                 from tailscale.com/net/netcheck+
         tailscale.com/net/proxymux                                   from tailscale.com/cmd/tailscaled
         tailscale.com/net/socks5                                     from tailscale.com/cmd/tailscaled
         tailscale.com/net/stun                                       from tailscale.com/net/netcheck+
         tailscale.com/net/tlsdial                                    from tailscale.com/control/controlclient+
         tailscale.com/net/tsaddr                                     from tailscale.com/ipn+
-        tailscale.com/net/tsdial                                     from tailscale.com/cmd/tailscaled+
-     💣 tailscale.com/net/tshttpproxy                                from tailscale.com/cmd/tailscaled+
-        tailscale.com/net/tstun                                      from tailscale.com/cmd/tailscaled+
-     💣 tailscale.com/paths                                          from tailscale.com/client/tailscale+
+        tailscale.com/net/tsdial                                     from tailscale.com/control/controlclient+
+     💣 tailscale.com/net/tshttpproxy                                from tailscale.com/control/controlclient+
+        tailscale.com/net/tstun                                      from tailscale.com/net/dns+
+        tailscale.com/paths                                          from tailscale.com/ipn/ipnlocal+
         tailscale.com/portlist                                       from tailscale.com/ipn/ipnlocal
         tailscale.com/safesocket                                     from tailscale.com/client/tailscale+
         tailscale.com/smallzstd                                      from tailscale.com/ipn/ipnserver+
-  LD 💣 tailscale.com/ssh/tailssh                                    from tailscale.com/wgengine/netstack
+  LD 💣 tailscale.com/ssh/tailssh                                    from tailscale.com/cmd/tailscaled
         tailscale.com/syncs                                          from tailscale.com/control/controlknobs+
-        tailscale.com/tailcfg                                        from tailscale.com/client/tailscale+
+        tailscale.com/tailcfg                                        from tailscale.com/client/tailscale/apitype+
   LD    tailscale.com/tempfork/gliderlabs/ssh                        from tailscale.com/ssh/tailssh
    W    tailscale.com/tsconst                                        from tailscale.com/net/interfaces
         tailscale.com/tstime                                         from tailscale.com/wgengine/magicsock
@@ -244,8 +248,8 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/types/empty                                    from tailscale.com/control/controlclient+
         tailscale.com/types/flagtype                                 from tailscale.com/cmd/tailscaled
         tailscale.com/types/ipproto                                  from tailscale.com/net/flowtrack+
-        tailscale.com/types/key                                      from tailscale.com/cmd/tailscaled+
-        tailscale.com/types/logger                                   from tailscale.com/cmd/tailscaled+
+        tailscale.com/types/key                                      from tailscale.com/control/controlbase+
+        tailscale.com/types/logger                                   from tailscale.com/control/controlclient+
         tailscale.com/types/netmap                                   from tailscale.com/control/controlclient+
         tailscale.com/types/nettype                                  from tailscale.com/wgengine/magicsock
         tailscale.com/types/opt                                      from tailscale.com/control/controlclient+
@@ -254,31 +258,33 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         tailscale.com/types/preftype                                 from tailscale.com/ipn+
         tailscale.com/types/structs                                  from tailscale.com/control/controlclient+
         tailscale.com/types/views                                    from tailscale.com/ipn/ipnlocal+
-        tailscale.com/util/clientmetric                              from tailscale.com/cmd/tailscaled+
+        tailscale.com/util/clientmetric                              from tailscale.com/control/controlclient+
+        tailscale.com/util/cloudenv                                  from tailscale.com/net/dns/resolver+
   LW    tailscale.com/util/cmpver                                    from tailscale.com/net/dns+
      💣 tailscale.com/util/deephash                                  from tailscale.com/ipn/ipnlocal+
         tailscale.com/util/dnsname                                   from tailscale.com/hostinfo+
   LW    tailscale.com/util/endian                                    from tailscale.com/net/dns+
         tailscale.com/util/groupmember                               from tailscale.com/ipn/ipnserver
         tailscale.com/util/lineread                                  from tailscale.com/hostinfo+
-        tailscale.com/util/multierr                                  from tailscale.com/cmd/tailscaled+
+        tailscale.com/util/mak                                       from tailscale.com/control/controlclient+
+        tailscale.com/util/multierr                                  from tailscale.com/control/controlclient+
         tailscale.com/util/netconv                                   from tailscale.com/wgengine/magicsock
-        tailscale.com/util/osshare                                   from tailscale.com/cmd/tailscaled+
+        tailscale.com/util/osshare                                   from tailscale.com/ipn/ipnlocal+
         tailscale.com/util/pidowner                                  from tailscale.com/ipn/ipnserver
         tailscale.com/util/racebuild                                 from tailscale.com/logpolicy
+        tailscale.com/util/singleflight                              from tailscale.com/control/controlclient+
         tailscale.com/util/systemd                                   from tailscale.com/control/controlclient+
         tailscale.com/util/uniq                                      from tailscale.com/wgengine/magicsock
-        tailscale.com/util/winutil                                   from tailscale.com/cmd/tailscaled+
-   W 💣 tailscale.com/util/winutil/vss                               from tailscale.com/util/winutil
-        tailscale.com/version                                        from tailscale.com/client/tailscale+
-        tailscale.com/version/distro                                 from tailscale.com/cmd/tailscaled+
+     💣 tailscale.com/util/winutil                                   from tailscale.com/cmd/tailscaled+
+        tailscale.com/version                                        from tailscale.com/derp+
+        tailscale.com/version/distro                                 from tailscale.com/hostinfo+
    W    tailscale.com/wf                                             from tailscale.com/cmd/tailscaled
-        tailscale.com/wgengine                                       from tailscale.com/cmd/tailscaled+
+        tailscale.com/wgengine                                       from tailscale.com/ipn/ipnlocal+
         tailscale.com/wgengine/filter                                from tailscale.com/control/controlclient+
         tailscale.com/wgengine/magicsock                             from tailscale.com/ipn/ipnlocal+
-        tailscale.com/wgengine/monitor                               from tailscale.com/cmd/tailscaled+
-        tailscale.com/wgengine/netstack                              from tailscale.com/cmd/tailscaled
-        tailscale.com/wgengine/router                                from tailscale.com/cmd/tailscaled+
+        tailscale.com/wgengine/monitor                               from tailscale.com/control/controlclient+
+        tailscale.com/wgengine/netstack                              from tailscale.com/cmd/tailscaled+
+        tailscale.com/wgengine/router                                from tailscale.com/ipn/ipnlocal+
         tailscale.com/wgengine/wgcfg                                 from tailscale.com/ipn/ipnlocal+
         tailscale.com/wgengine/wgcfg/nmcfg                           from tailscale.com/ipn/ipnlocal
         tailscale.com/wgengine/wglog                                 from tailscale.com/wgengine
@@ -298,7 +304,7 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         golang.org/x/crypto/nacl/secretbox                           from golang.org/x/crypto/nacl/box
         golang.org/x/crypto/poly1305                                 from golang.zx2c4.com/wireguard/device+
         golang.org/x/crypto/salsa20/salsa                            from golang.org/x/crypto/nacl/box+
-  LD    golang.org/x/crypto/ssh                                      from tailscale.com/ssh/tailssh
+  LD    golang.org/x/crypto/ssh                                      from tailscale.com/ssh/tailssh+
         golang.org/x/net/bpf                                         from github.com/mdlayher/genetlink+
         golang.org/x/net/dns/dnsmessage                              from net+
         golang.org/x/net/http/httpguts                               from golang.org/x/net/http2+
@@ -312,12 +318,12 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         golang.org/x/net/proxy                                       from tailscale.com/net/netns
    D    golang.org/x/net/route                                       from net+
         golang.org/x/sync/errgroup                                   from github.com/mdlayher/socket+
-        golang.org/x/sync/singleflight                               from tailscale.com/control/controlclient+
         golang.org/x/sys/cpu                                         from golang.org/x/crypto/blake2b+
   LD    golang.org/x/sys/unix                                        from github.com/insomniacslk/dhcp/interfaces+
    W    golang.org/x/sys/windows                                     from github.com/go-ole/go-ole+
-   W    golang.org/x/sys/windows/registry                            from golang.zx2c4.com/wireguard/windows/tunnel/winipcfg+
+   W    golang.org/x/sys/windows/registry                            from golang.org/x/sys/windows/svc/eventlog+
    W    golang.org/x/sys/windows/svc                                 from golang.org/x/sys/windows/svc/mgr+
+   W    golang.org/x/sys/windows/svc/eventlog                        from tailscale.com/cmd/tailscaled
    W    golang.org/x/sys/windows/svc/mgr                             from tailscale.com/cmd/tailscaled
         golang.org/x/term                                            from tailscale.com/logpolicy
         golang.org/x/text/secure/bidirule                            from golang.org/x/net/idna
@@ -349,10 +355,10 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         crypto/sha256                                                from crypto/tls+
         crypto/sha512                                                from crypto/ecdsa+
         crypto/subtle                                                from crypto/aes+
-        crypto/tls                                                   from github.com/aws/aws-sdk-go-v2/aws/transport/http+
+        crypto/tls                                                   from github.com/tcnksm/go-httpstat+
         crypto/x509                                                  from crypto/tls+
         crypto/x509/pkix                                             from crypto/x509+
-        embed                                                        from crypto/elliptic+
+        embed                                                        from tailscale.com+
         encoding                                                     from encoding/json+
         encoding/asn1                                                from crypto/x509+
         encoding/base64                                              from encoding/json+
@@ -360,19 +366,19 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         encoding/hex                                                 from crypto/x509+
         encoding/json                                                from expvar+
         encoding/pem                                                 from crypto/tls+
-        encoding/xml                                                 from github.com/aws/aws-sdk-go-v2/aws/protocol/xml+
+        encoding/xml                                                 from github.com/tailscale/goupnp+
         errors                                                       from bufio+
         expvar                                                       from tailscale.com/derp+
-        flag                                                         from tailscale.com/cmd/tailscaled+
+        flag                                                         from tailscale.com/control/controlclient+
         fmt                                                          from compress/flate+
         hash                                                         from crypto+
         hash/crc32                                                   from compress/gzip+
-        hash/fnv                                                     from gvisor.dev/gvisor/pkg/tcpip/network/ipv6+
+        hash/fnv                                                     from tailscale.com/wgengine/magicsock+
         hash/maphash                                                 from go4.org/mem
-        html                                                         from net/http/pprof+
+        html                                                         from tailscale.com/ipn/ipnlocal+
         io                                                           from bufio+
         io/fs                                                        from crypto/rand+
-        io/ioutil                                                    from github.com/aws/aws-sdk-go-v2/aws/protocol/query+
+        io/ioutil                                                    from github.com/godbus/dbus/v5+
         log                                                          from expvar+
   LD    log/syslog                                                   from tailscale.com/ssh/tailssh
         math                                                         from compress/flate+
@@ -389,19 +395,19 @@ tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/de
         net/http/internal                                            from net/http+
         net/http/pprof                                               from tailscale.com/cmd/tailscaled+
         net/netip                                                    from golang.zx2c4.com/wireguard/conn+
-        net/textproto                                                from github.com/aws/aws-sdk-go-v2/aws/signer/v4+
+        net/textproto                                                from golang.org/x/net/http/httpguts+
         net/url                                                      from crypto/x509+
         os                                                           from crypto/rand+
-        os/exec                                                      from github.com/aws/aws-sdk-go-v2/credentials/processcreds+
+        os/exec                                                      from github.com/coreos/go-iptables/iptables+
         os/signal                                                    from tailscale.com/cmd/tailscaled+
         os/user                                                      from github.com/godbus/dbus/v5+
-        path                                                         from github.com/aws/aws-sdk-go-v2/credentials/ec2rolecreds+
+        path                                                         from github.com/godbus/dbus/v5+
         path/filepath                                                from crypto/x509+
         reflect                                                      from crypto/x509+
-        regexp                                                       from github.com/aws/aws-sdk-go-v2/internal/endpoints/v2+
+        regexp                                                       from github.com/coreos/go-iptables/iptables+
         regexp/syntax                                                from regexp
         runtime/debug                                                from github.com/klauspost/compress/zstd+
-        runtime/pprof                                                from net/http/pprof+
+        runtime/pprof                                                from tailscale.com/log/logheap+
         runtime/trace                                                from net/http/pprof
         sort                                                         from compress/flate+
         strconv                                                      from compress/flate+

cmd/tailscaled/ssh.go

@@ -0,0 +1,11 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+//go:build linux || darwin
+// +build linux darwin
+
+package main
+
+// Force registration of tailssh with LocalBackend.
+import _ "tailscale.com/ssh/tailssh"

cmd/tailscaled/tailscaled.go

@@ -137,7 +137,7 @@ func main() {
 	flag.StringVar(&args.httpProxyAddr, "outbound-http-proxy-listen", "", `optional [ip]:port to run an outbound HTTP proxy (e.g. "localhost:8080")`)
 	flag.StringVar(&args.tunname, "tun", defaultTunName(), `tunnel interface name; use "userspace-networking" (beta) to not use TUN`)
 	flag.Var(flagtype.PortValue(&args.port, 0), "port", "UDP port to listen on for WireGuard and peer-to-peer traffic; 0 means automatically select")
-	flag.StringVar(&args.statepath, "state", paths.DefaultTailscaledStateFile(), "absolute path of state file; use 'kube:<secret-name>' to use Kubernetes secrets or 'arn:aws:ssm:...' to store in AWS SSM; use 'mem:' to not store state and register as an emphemeral node. If empty and --statedir is provided, the default is <statedir>/tailscaled.state")
+	flag.StringVar(&args.statepath, "state", "", "absolute path of state file; use 'kube:<secret-name>' to use Kubernetes secrets or 'arn:aws:ssm:...' to store in AWS SSM; use 'mem:' to not store state and register as an emphemeral node. If empty and --statedir is provided, the default is <statedir>/tailscaled.state. Default: "+paths.DefaultTailscaledStateFile())
 	flag.StringVar(&args.statedir, "statedir", "", "path to directory for storage of config state, TLS certs, temporary incoming Taildrop files, etc. If empty, it's derived from --state when possible.")
 	flag.StringVar(&args.socketpath, "socket", paths.DefaultTailscaledSocket(), "path of the service unix socket")
 	flag.StringVar(&args.birdSocketPath, "bird-socket", "", "path of the bird unix socket")
@@ -158,13 +158,12 @@ func main() {
 		}
 	}
 
-	if beWindowsSubprocess() {
-		return
-	}
-
 	flag.Parse()
 	if flag.NArg() > 0 {
-		log.Fatalf("tailscaled does not take non-flag arguments: %q", flag.Args())
+		// Windows subprocess is spawned with /subprocess, so we need to avoid this check there.
+		if runtime.GOOS != "windows" || (flag.Arg(0) != "/subproc" && flag.Arg(0) != "/firewall") {
+			log.Fatalf("tailscaled does not take non-flag arguments: %q", flag.Args())
+		}
 	}
 
 	if printVersion {
@@ -187,6 +186,16 @@ func main() {
 		log.Fatalf("--bird-socket is not supported on %s", runtime.GOOS)
 	}
 
+	// Only apply a default statepath when neither have been provided, so that a
+	// user may specify only --statedir if they wish.
+	if args.statepath == "" && args.statedir == "" {
+		args.statepath = paths.DefaultTailscaledStateFile()
+	}
+
+	if beWindowsSubprocess() {
+		return
+	}
+
 	err := run()
 
 	// Remove file sharing from Windows shell (noop in non-windows)
@@ -332,6 +341,7 @@ func run() error {
 	socksListener, httpProxyListener := mustStartProxyListeners(args.socksAddr, args.httpProxyAddr)
 
 	dialer := new(tsdial.Dialer) // mutated below (before used)
+	dialer.Logf = logf
 	e, useNetstack, err := createEngine(logf, linkMon, dialer)
 	if err != nil {
 		return fmt.Errorf("createEngine: %w", err)
@@ -341,7 +351,7 @@ func run() error {
 	}
 	if debugMux != nil {
 		if ig, ok := e.(wgengine.InternalsGetter); ok {
-			if _, mc, ok := ig.GetInternals(); ok {
+			if _, mc, _, ok := ig.GetInternals(); ok {
 				debugMux.HandleFunc("/debug/magicsock", mc.ServeHTTPDebug)
 			}
 		}
@@ -394,6 +404,7 @@ func run() error {
 	// want to keep running.
 	signal.Ignore(syscall.SIGPIPE)
 	go func() {
+		defer dialer.Close()
 		select {
 		case s := <-interrupt:
 			logf("tailscaled got signal %v; shutting down", s)
@@ -564,11 +575,11 @@ func runDebugServer(mux *http.ServeMux, addr string) {
 }
 
 func newNetstack(logf logger.Logf, dialer *tsdial.Dialer, e wgengine.Engine) (*netstack.Impl, error) {
-	tunDev, magicConn, ok := e.(wgengine.InternalsGetter).GetInternals()
+	tunDev, magicConn, dns, ok := e.(wgengine.InternalsGetter).GetInternals()
 	if !ok {
 		return nil, fmt.Errorf("%T is not a wgengine.InternalsGetter", e)
 	}
-	return netstack.Create(logf, tunDev, e, magicConn, dialer)
+	return netstack.Create(logf, tunDev, e, magicConn, dialer, dns)
 }
 
 // mustStartProxyListeners creates listeners for local SOCKS and HTTP

cmd/tailscaled/tailscaled_windows.go

@@ -30,6 +30,7 @@ import (
 
 	"golang.org/x/sys/windows"
 	"golang.org/x/sys/windows/svc"
+	"golang.org/x/sys/windows/svc/eventlog"
 	"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
 	"inet.af/netaddr"
 	"tailscale.com/envknob"
@@ -60,12 +61,31 @@ func isWindowsService() bool {
 	return v
 }
 
+// syslogf is a logger function that writes to the Windows event log (ie, the
+// one that you see in the Windows Event Viewer). tailscaled may optionally
+// generate diagnostic messages in the same event timeline as the Windows
+// Service Control Manager to assist with diagnosing issues with tailscaled's
+// lifetime (such as slow shutdowns).
+var syslogf logger.Logf = logger.Discard
+
 // runWindowsService starts running Tailscale under the Windows
 // Service environment.
 //
 // At this point we're still the parent process that
 // Windows started.
 func runWindowsService(pol *logpolicy.Policy) error {
+	if winutil.GetPolicyInteger("LogSCMInteractions", 0) != 0 {
+		syslog, err := eventlog.Open(serviceName)
+		if err == nil {
+			syslogf = func(format string, args ...any) {
+				syslog.Info(0, fmt.Sprintf(format, args...))
+			}
+			defer syslog.Close()
+		}
+	}
+
+	syslogf("Service entering svc.Run")
+	defer syslogf("Service exiting svc.Run")
 	return svc.Run(serviceName, &ipnService{Policy: pol})
 }
 
@@ -75,7 +95,10 @@ type ipnService struct {
 
 // Called by Windows to execute the windows service.
 func (service *ipnService) Execute(args []string, r <-chan svc.ChangeRequest, changes chan<- svc.Status) (bool, uint32) {
+	defer syslogf("SvcStopped notification imminent")
+
 	changes <- svc.Status{State: svc.StartPending}
+	syslogf("Service start pending")
 
 	svcAccepts := svc.AcceptStop
 	if winutil.GetPolicyInteger("FlushDNSOnSessionUnlock", 0) != 0 {
@@ -98,26 +121,29 @@ func (service *ipnService) Execute(args []string, r <-chan svc.ChangeRequest, ch
 	}()
 
 	changes <- svc.Status{State: svc.Running, Accepts: svcAccepts}
+	syslogf("Service running")
 
-	for ctx.Err() == nil {
+	for {
 		select {
 		case <-doneCh:
+			return false, windows.NO_ERROR
 		case cmd := <-r:
 			log.Printf("Got Windows Service event: %v", cmdName(cmd.Cmd))
 			switch cmd.Cmd {
 			case svc.Stop:
-				cancel()
+				changes <- svc.Status{State: svc.StopPending}
+				syslogf("Service stop pending")
+				cancel() // so BabysitProc will kill the child process
 			case svc.Interrogate:
+				syslogf("Service interrogation")
 				changes <- cmd.CurrentStatus
 			case svc.SessionChange:
+				syslogf("Service session change notification")
 				handleSessionChange(cmd)
 				changes <- cmd.CurrentStatus
 			}
 		}
 	}
-
-	changes <- svc.Status{State: svc.StopPending}
-	return false, windows.NO_ERROR
 }
 
 func cmdName(c svc.Cmd) string {
@@ -234,19 +260,19 @@ func startIPNServer(ctx context.Context, logid string) error {
 
 	linkMon, err := monitor.New(logf)
 	if err != nil {
-		return err
+		return fmt.Errorf("monitor: %w", err)
 	}
 	dialer := new(tsdial.Dialer)
 
-	getEngineRaw := func() (wgengine.Engine, error) {
+	getEngineRaw := func() (wgengine.Engine, *netstack.Impl, error) {
 		dev, devName, err := tstun.New(logf, "Tailscale")
 		if err != nil {
-			return nil, fmt.Errorf("TUN: %w", err)
+			return nil, nil, fmt.Errorf("TUN: %w", err)
 		}
 		r, err := router.New(logf, dev, nil)
 		if err != nil {
 			dev.Close()
-			return nil, fmt.Errorf("router: %w", err)
+			return nil, nil, fmt.Errorf("router: %w", err)
 		}
 		if wrapNetstack {
 			r = netstack.NewSubnetRouterWrapper(r)
@@ -255,7 +281,7 @@ func startIPNServer(ctx context.Context, logid string) error {
 		if err != nil {
 			r.Close()
 			dev.Close()
-			return nil, fmt.Errorf("DNS: %w", err)
+			return nil, nil, fmt.Errorf("DNS: %w", err)
 		}
 		eng, err := wgengine.NewUserspaceEngine(logf, wgengine.Config{
 			Tun:         dev,
@@ -268,23 +294,24 @@ func startIPNServer(ctx context.Context, logid string) error {
 		if err != nil {
 			r.Close()
 			dev.Close()
-			return nil, fmt.Errorf("engine: %w", err)
+			return nil, nil, fmt.Errorf("engine: %w", err)
 		}
 		ns, err := newNetstack(logf, dialer, eng)
 		if err != nil {
-			return nil, fmt.Errorf("newNetstack: %w", err)
+			return nil, nil, fmt.Errorf("newNetstack: %w", err)
 		}
 		ns.ProcessLocalIPs = false
 		ns.ProcessSubnets = wrapNetstack
 		if err := ns.Start(); err != nil {
-			return nil, fmt.Errorf("failed to start netstack: %w", err)
+			return nil, nil, fmt.Errorf("failed to start netstack: %w", err)
 		}
-		return wgengine.NewWatchdog(eng), nil
+		return wgengine.NewWatchdog(eng), ns, nil
 	}
 
 	type engineOrError struct {
-		Engine wgengine.Engine
-		Err    error
+		Engine   wgengine.Engine
+		Netstack *netstack.Impl
+		Err      error
 	}
 	engErrc := make(chan engineOrError)
 	t0 := time.Now()
@@ -293,7 +320,7 @@ func startIPNServer(ctx context.Context, logid string) error {
 		for try := 1; ; try++ {
 			logf("tailscaled: getting engine... (try %v)", try)
 			t1 := time.Now()
-			eng, err := getEngineRaw()
+			eng, ns, err := getEngineRaw()
 			d, dt := time.Since(t1).Round(ms), time.Since(t1).Round(ms)
 			if err != nil {
 				logf("tailscaled: engine fetch error (try %v) in %v (total %v, sysUptime %v): %v",
@@ -306,7 +333,7 @@ func startIPNServer(ctx context.Context, logid string) error {
 				}
 			}
 			timer := time.NewTimer(5 * time.Second)
-			engErrc <- engineOrError{eng, err}
+			engErrc <- engineOrError{eng, ns, err}
 			if err == nil {
 				timer.Stop()
 				return
@@ -318,14 +345,14 @@ func startIPNServer(ctx context.Context, logid string) error {
 	// getEngine is called by ipnserver to get the engine. It's
 	// not called concurrently and is not called again once it
 	// successfully returns an engine.
-	getEngine := func() (wgengine.Engine, error) {
+	getEngine := func() (wgengine.Engine, *netstack.Impl, error) {
 		if msg := envknob.String("TS_DEBUG_WIN_FAIL"); msg != "" {
-			return nil, fmt.Errorf("pretending to be a service failure: %v", msg)
+			return nil, nil, fmt.Errorf("pretending to be a service failure: %v", msg)
 		}
 		for {
 			res := <-engErrc
 			if res.Engine != nil {
-				return res.Engine, nil
+				return res.Engine, res.Netstack, nil
 			}
 			if time.Since(t0) < time.Minute || windowsUptime() < 10*time.Minute {
 				// Ignore errors during early boot. Windows 10 auto logs in the GUI
@@ -336,12 +363,12 @@ func startIPNServer(ctx context.Context, logid string) error {
 			}
 			// Return nicer errors to users, annotated with logids, which helps
 			// when they file bugs.
-			return nil, fmt.Errorf("%w\n\nlogid: %v", res.Err, logid)
+			return nil, nil, fmt.Errorf("%w\n\nlogid: %v", res.Err, logid)
 		}
 	}
 	store, err := store.New(logf, statePathOrDefault())
 	if err != nil {
-		return err
+		return fmt.Errorf("store: %w", err)
 	}
 
 	ln, _, err := safesocket.Listen(args.socketpath, safesocket.WindowsLocalPort)

cmd/tsshd/tsshd.go

@@ -2,177 +2,12 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-//go:build !windows
-// +build !windows
+//go:build ignore
+// +build ignore
 
-// The tsshd binary is an SSH server that accepts connections
+// The tsshd binary was an experimental SSH server that accepts connections
 // from anybody on the same Tailscale network.
 //
-// It does not use passwords or SSH public key.
+// Its functionality moved into tailscaled.
 //
-// Any user name is accepted; users are logged in as whoever is
-// running this daemon.
-//
-// Warning: use at your own risk. This code has had very few eyeballs
-// on it.
-package main
-
-import (
-	"flag"
-	"fmt"
-	"io"
-	"io/ioutil"
-	"log"
-	"net"
-	"os"
-	"os/exec"
-	"syscall"
-	"time"
-	"unsafe"
-
-	"github.com/creack/pty"
-	gossh "github.com/tailscale/golang-x-crypto/ssh"
-	"inet.af/netaddr"
-	"tailscale.com/net/interfaces"
-	"tailscale.com/net/tsaddr"
-	"tailscale.com/tempfork/gliderlabs/ssh"
-)
-
-var (
-	port    = flag.Int("port", 2200, "port to listen on")
-	hostKey = flag.String("hostkey", "", "SSH host key")
-)
-
-func main() {
-	flag.Parse()
-	if *hostKey == "" {
-		log.Fatalf("missing required --hostkey")
-	}
-	hostKey, err := ioutil.ReadFile(*hostKey)
-	if err != nil {
-		log.Fatal(err)
-	}
-	signer, err := gossh.ParsePrivateKey(hostKey)
-	if err != nil {
-		log.Printf("failed to parse SSH host key: %v", err)
-		return
-	}
-
-	warned := false
-	for {
-		addrs, iface, err := interfaces.Tailscale()
-		if err != nil {
-			log.Fatalf("listing interfaces: %v", err)
-		}
-		if len(addrs) == 0 {
-			if !warned {
-				log.Printf("no tailscale interface found; polling until one is available")
-				warned = true
-			}
-			// TODO: use netlink or other OS-specific mechanism to efficiently
-			// wait for change in interfaces. Polling every N seconds is good enough
-			// for now.
-			time.Sleep(5 * time.Second)
-			continue
-		}
-		warned = false
-		var addr netaddr.IP
-		for _, a := range addrs {
-			if a.Is4() {
-				addr = a
-				break
-			}
-		}
-		listen := net.JoinHostPort(addr.String(), fmt.Sprint(*port))
-		log.Printf("tailscale ssh server listening on %v, %v", iface.Name, listen)
-		s := &ssh.Server{
-			Addr:    listen,
-			Handler: handleSSH,
-		}
-		s.AddHostKey(signer)
-
-		err = s.ListenAndServe()
-		log.Fatalf("tailscale sshd failed: %v", err)
-	}
-
-}
-
-func handleSSH(s ssh.Session) {
-	user := s.User()
-	addr := s.RemoteAddr()
-	ta, ok := addr.(*net.TCPAddr)
-	if !ok {
-		log.Printf("tsshd: rejecting non-TCP addr %T %v", addr, addr)
-		s.Exit(1)
-		return
-	}
-	tanetaddr, ok := netaddr.FromStdIP(ta.IP)
-	if !ok {
-		log.Printf("tsshd: rejecting unparseable addr %v", ta.IP)
-		s.Exit(1)
-		return
-	}
-	if !tsaddr.IsTailscaleIP(tanetaddr) {
-		log.Printf("tsshd: rejecting non-Tailscale addr %v", ta.IP)
-		s.Exit(1)
-		return
-	}
-
-	log.Printf("new session for %q from %v", user, ta)
-	defer log.Printf("closing session for %q from %v", user, ta)
-	ptyReq, winCh, isPty := s.Pty()
-	if !isPty {
-		fmt.Fprintf(s, "TODO scp etc")
-		s.Exit(1)
-		return
-	}
-
-	userWantsShell := len(s.Command()) == 0
-
-	if userWantsShell {
-		shell, err := shellOfUser(s.User())
-		if err != nil {
-			fmt.Fprintf(s, "failed to find shell: %v\n", err)
-			s.Exit(1)
-			return
-		}
-		cmd := exec.Command(shell)
-		cmd.Env = append(cmd.Env, fmt.Sprintf("TERM=%s", ptyReq.Term))
-		f, err := pty.Start(cmd)
-		if err != nil {
-			log.Printf("running shell: %v", err)
-			s.Exit(1)
-			return
-		}
-		defer f.Close()
-		go func() {
-			for win := range winCh {
-				setWinsize(f, win.Width, win.Height)
-			}
-		}()
-		go func() {
-			io.Copy(f, s) // stdin
-		}()
-		io.Copy(s, f) // stdout
-		cmd.Process.Kill()
-		if err := cmd.Wait(); err != nil {
-			s.Exit(1)
-		} else {
-			s.Exit(0)
-		}
-		return
-	}
-
-	fmt.Fprintf(s, "TODO: args\n")
-	s.Exit(1)
-}
-
-func shellOfUser(user string) (string, error) {
-	// TODO
-	return "/bin/bash", nil
-}
-
-func setWinsize(f *os.File, w, h int) {
-	syscall.Syscall(syscall.SYS_IOCTL, f.Fd(), uintptr(syscall.TIOCSWINSZ),
-		uintptr(unsafe.Pointer(&struct{ h, w, x, y uint16 }{uint16(h), uint16(w), 0, 0})))
-}
+// See https://github.com/tailscale/tailscale/issues/3802

cmd/tsshd/tsshd_windows.go

@@ -1,12 +0,0 @@
-// Copyright (c) 2020 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-//go:build windows
-// +build windows
-
-package main
-
-func main() {
-	panic("tsshd does not work on windows yet")
-}

cmd/viewer/tests/tests.go

@@ -0,0 +1,59 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package tests serves a list of tests for tailscale.com/cmd/viewer.
+package tests
+
+import (
+	"fmt"
+
+	"inet.af/netaddr"
+)
+
+//go:generate go run tailscale.com/cmd/viewer --type=StructWithPtrs,StructWithoutPtrs,Map,StructWithSlices
+
+type StructWithoutPtrs struct {
+	Int int
+	Pfx netaddr.IPPrefix
+}
+
+type Map struct {
+	Int                 map[string]int
+	SliceInt            map[string][]int
+	StructWithPtr       map[string]*StructWithPtrs
+	StructWithoutPtr    map[string]*StructWithoutPtrs
+	SlicesWithPtrs      map[string][]*StructWithPtrs
+	SlicesWithoutPtrs   map[string][]*StructWithoutPtrs
+	StructWithoutPtrKey map[StructWithoutPtrs]int `json:"-"`
+
+	// Unsupported.
+	SliceIntPtr      map[string][]*int
+	PointerKey       map[*string]int        `json:"-"`
+	StructWithPtrKey map[StructWithPtrs]int `json:"-"`
+}
+
+type StructWithPtrs struct {
+	Value *StructWithoutPtrs
+	Int   *int
+
+	NoCloneValue *StructWithoutPtrs `codegen:"noclone"`
+}
+
+func (v *StructWithPtrs) String() string { return fmt.Sprintf("%v", v.Int) }
+
+func (v *StructWithPtrs) Equal(v2 *StructWithPtrs) bool {
+	return v.Value == v2.Value
+}
+
+type StructWithSlices struct {
+	Values         []StructWithoutPtrs
+	ValuePointers  []*StructWithoutPtrs
+	StructPointers []*StructWithPtrs
+	Structs        []StructWithPtrs
+	Ints           []*int
+
+	Slice    []string
+	Prefixes []netaddr.IPPrefix
+	Data     []byte
+}

cmd/viewer/tests/tests_clone.go

@@ -0,0 +1,183 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by tailscale.com/cmd/cloner; DO NOT EDIT.
+
+package tests
+
+import (
+	"inet.af/netaddr"
+)
+
+// Clone makes a deep copy of StructWithPtrs.
+// The result aliases no memory with the original.
+func (src *StructWithPtrs) Clone() *StructWithPtrs {
+	if src == nil {
+		return nil
+	}
+	dst := new(StructWithPtrs)
+	*dst = *src
+	if dst.Value != nil {
+		dst.Value = new(StructWithoutPtrs)
+		*dst.Value = *src.Value
+	}
+	if dst.Int != nil {
+		dst.Int = new(int)
+		*dst.Int = *src.Int
+	}
+	return dst
+}
+
+// A compilation failure here means this code must be regenerated, with the command at the top of this file.
+var _StructWithPtrsCloneNeedsRegeneration = StructWithPtrs(struct {
+	Value        *StructWithoutPtrs
+	Int          *int
+	NoCloneValue *StructWithoutPtrs
+}{})
+
+// Clone makes a deep copy of StructWithoutPtrs.
+// The result aliases no memory with the original.
+func (src *StructWithoutPtrs) Clone() *StructWithoutPtrs {
+	if src == nil {
+		return nil
+	}
+	dst := new(StructWithoutPtrs)
+	*dst = *src
+	return dst
+}
+
+// A compilation failure here means this code must be regenerated, with the command at the top of this file.
+var _StructWithoutPtrsCloneNeedsRegeneration = StructWithoutPtrs(struct {
+	Int int
+	Pfx netaddr.IPPrefix
+}{})
+
+// Clone makes a deep copy of Map.
+// The result aliases no memory with the original.
+func (src *Map) Clone() *Map {
+	if src == nil {
+		return nil
+	}
+	dst := new(Map)
+	*dst = *src
+	if dst.Int != nil {
+		dst.Int = map[string]int{}
+		for k, v := range src.Int {
+			dst.Int[k] = v
+		}
+	}
+	if dst.SliceInt != nil {
+		dst.SliceInt = map[string][]int{}
+		for k := range src.SliceInt {
+			dst.SliceInt[k] = append([]int{}, src.SliceInt[k]...)
+		}
+	}
+	if dst.StructWithPtr != nil {
+		dst.StructWithPtr = map[string]*StructWithPtrs{}
+		for k, v := range src.StructWithPtr {
+			dst.StructWithPtr[k] = v.Clone()
+		}
+	}
+	if dst.StructWithoutPtr != nil {
+		dst.StructWithoutPtr = map[string]*StructWithoutPtrs{}
+		for k, v := range src.StructWithoutPtr {
+			dst.StructWithoutPtr[k] = v.Clone()
+		}
+	}
+	if dst.SlicesWithPtrs != nil {
+		dst.SlicesWithPtrs = map[string][]*StructWithPtrs{}
+		for k := range src.SlicesWithPtrs {
+			dst.SlicesWithPtrs[k] = append([]*StructWithPtrs{}, src.SlicesWithPtrs[k]...)
+		}
+	}
+	if dst.SlicesWithoutPtrs != nil {
+		dst.SlicesWithoutPtrs = map[string][]*StructWithoutPtrs{}
+		for k := range src.SlicesWithoutPtrs {
+			dst.SlicesWithoutPtrs[k] = append([]*StructWithoutPtrs{}, src.SlicesWithoutPtrs[k]...)
+		}
+	}
+	if dst.StructWithoutPtrKey != nil {
+		dst.StructWithoutPtrKey = map[StructWithoutPtrs]int{}
+		for k, v := range src.StructWithoutPtrKey {
+			dst.StructWithoutPtrKey[k] = v
+		}
+	}
+	if dst.SliceIntPtr != nil {
+		dst.SliceIntPtr = map[string][]*int{}
+		for k := range src.SliceIntPtr {
+			dst.SliceIntPtr[k] = append([]*int{}, src.SliceIntPtr[k]...)
+		}
+	}
+	if dst.PointerKey != nil {
+		dst.PointerKey = map[*string]int{}
+		for k, v := range src.PointerKey {
+			dst.PointerKey[k] = v
+		}
+	}
+	if dst.StructWithPtrKey != nil {
+		dst.StructWithPtrKey = map[StructWithPtrs]int{}
+		for k, v := range src.StructWithPtrKey {
+			dst.StructWithPtrKey[k] = v
+		}
+	}
+	return dst
+}
+
+// A compilation failure here means this code must be regenerated, with the command at the top of this file.
+var _MapCloneNeedsRegeneration = Map(struct {
+	Int                 map[string]int
+	SliceInt            map[string][]int
+	StructWithPtr       map[string]*StructWithPtrs
+	StructWithoutPtr    map[string]*StructWithoutPtrs
+	SlicesWithPtrs      map[string][]*StructWithPtrs
+	SlicesWithoutPtrs   map[string][]*StructWithoutPtrs
+	StructWithoutPtrKey map[StructWithoutPtrs]int
+	SliceIntPtr         map[string][]*int
+	PointerKey          map[*string]int
+	StructWithPtrKey    map[StructWithPtrs]int
+}{})
+
+// Clone makes a deep copy of StructWithSlices.
+// The result aliases no memory with the original.
+func (src *StructWithSlices) Clone() *StructWithSlices {
+	if src == nil {
+		return nil
+	}
+	dst := new(StructWithSlices)
+	*dst = *src
+	dst.Values = append(src.Values[:0:0], src.Values...)
+	dst.ValuePointers = make([]*StructWithoutPtrs, len(src.ValuePointers))
+	for i := range dst.ValuePointers {
+		dst.ValuePointers[i] = src.ValuePointers[i].Clone()
+	}
+	dst.StructPointers = make([]*StructWithPtrs, len(src.StructPointers))
+	for i := range dst.StructPointers {
+		dst.StructPointers[i] = src.StructPointers[i].Clone()
+	}
+	dst.Structs = make([]StructWithPtrs, len(src.Structs))
+	for i := range dst.Structs {
+		dst.Structs[i] = *src.Structs[i].Clone()
+	}
+	dst.Ints = make([]*int, len(src.Ints))
+	for i := range dst.Ints {
+		x := *src.Ints[i]
+		dst.Ints[i] = &x
+	}
+	dst.Slice = append(src.Slice[:0:0], src.Slice...)
+	dst.Prefixes = append(src.Prefixes[:0:0], src.Prefixes...)
+	dst.Data = append(src.Data[:0:0], src.Data...)
+	return dst
+}
+
+// A compilation failure here means this code must be regenerated, with the command at the top of this file.
+var _StructWithSlicesCloneNeedsRegeneration = StructWithSlices(struct {
+	Values         []StructWithoutPtrs
+	ValuePointers  []*StructWithoutPtrs
+	StructPointers []*StructWithPtrs
+	Structs        []StructWithPtrs
+	Ints           []*int
+	Slice          []string
+	Prefixes       []netaddr.IPPrefix
+	Data           []byte
+}{})

cmd/viewer/tests/tests_view.go

@@ -0,0 +1,316 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Code generated by tailscale/cmd/viewer; DO NOT EDIT.
+
+package tests
+
+import (
+	"encoding/json"
+	"errors"
+
+	"go4.org/mem"
+	"inet.af/netaddr"
+	"tailscale.com/types/views"
+)
+
+//go:generate go run tailscale.com/cmd/cloner  -clonefunc=false -type=StructWithPtrs,StructWithoutPtrs,Map,StructWithSlices
+
+// View returns a readonly view of StructWithPtrs.
+func (p *StructWithPtrs) View() StructWithPtrsView {
+	return StructWithPtrsView{ж: p}
+}
+
+// StructWithPtrsView provides a read-only view over StructWithPtrs.
+//
+// Its methods should only be called if `Valid()` returns true.
+type StructWithPtrsView struct {
+	// ж is the underlying mutable value, named with a hard-to-type
+	// character that looks pointy like a pointer.
+	// It is named distinctively to make you think of how dangerous it is to escape
+	// to callers. You must not let callers be able to mutate it.
+	ж *StructWithPtrs
+}
+
+// Valid reports whether underlying value is non-nil.
+func (v StructWithPtrsView) Valid() bool { return v.ж != nil }
+
+// AsStruct returns a clone of the underlying value which aliases no memory with
+// the original.
+func (v StructWithPtrsView) AsStruct() *StructWithPtrs {
+	if v.ж == nil {
+		return nil
+	}
+	return v.ж.Clone()
+}
+
+func (v StructWithPtrsView) MarshalJSON() ([]byte, error) { return json.Marshal(v.ж) }
+
+func (v *StructWithPtrsView) UnmarshalJSON(b []byte) error {
+	if v.ж != nil {
+		return errors.New("already initialized")
+	}
+	if len(b) == 0 {
+		return nil
+	}
+	var x StructWithPtrs
+	if err := json.Unmarshal(b, &x); err != nil {
+		return err
+	}
+	v.ж = &x
+	return nil
+}
+
+func (v StructWithPtrsView) Value() *StructWithoutPtrs {
+	if v.ж.Value == nil {
+		return nil
+	}
+	x := *v.ж.Value
+	return &x
+}
+
+func (v StructWithPtrsView) Int() *int {
+	if v.ж.Int == nil {
+		return nil
+	}
+	x := *v.ж.Int
+	return &x
+}
+
+func (v StructWithPtrsView) NoCloneValue() *StructWithoutPtrs { return v.ж.NoCloneValue }
+func (v StructWithPtrsView) String() string                   { return v.ж.String() }
+func (v StructWithPtrsView) Equal(v2 StructWithPtrsView) bool { return v.ж.Equal(v2.ж) }
+
+// A compilation failure here means this code must be regenerated, with the command at the top of this file.
+var _StructWithPtrsViewNeedsRegeneration = StructWithPtrs(struct {
+	Value        *StructWithoutPtrs
+	Int          *int
+	NoCloneValue *StructWithoutPtrs
+}{})
+
+// View returns a readonly view of StructWithoutPtrs.
+func (p *StructWithoutPtrs) View() StructWithoutPtrsView {
+	return StructWithoutPtrsView{ж: p}
+}
+
+// StructWithoutPtrsView provides a read-only view over StructWithoutPtrs.
+//
+// Its methods should only be called if `Valid()` returns true.
+type StructWithoutPtrsView struct {
+	// ж is the underlying mutable value, named with a hard-to-type
+	// character that looks pointy like a pointer.
+	// It is named distinctively to make you think of how dangerous it is to escape
+	// to callers. You must not let callers be able to mutate it.
+	ж *StructWithoutPtrs
+}
+
+// Valid reports whether underlying value is non-nil.
+func (v StructWithoutPtrsView) Valid() bool { return v.ж != nil }
+
+// AsStruct returns a clone of the underlying value which aliases no memory with
+// the original.
+func (v StructWithoutPtrsView) AsStruct() *StructWithoutPtrs {
+	if v.ж == nil {
+		return nil
+	}
+	return v.ж.Clone()
+}
+
+func (v StructWithoutPtrsView) MarshalJSON() ([]byte, error) { return json.Marshal(v.ж) }
+
+func (v *StructWithoutPtrsView) UnmarshalJSON(b []byte) error {
+	if v.ж != nil {
+		return errors.New("already initialized")
+	}
+	if len(b) == 0 {
+		return nil
+	}
+	var x StructWithoutPtrs
+	if err := json.Unmarshal(b, &x); err != nil {
+		return err
+	}
+	v.ж = &x
+	return nil
+}
+
+func (v StructWithoutPtrsView) Int() int              { return v.ж.Int }
+func (v StructWithoutPtrsView) Pfx() netaddr.IPPrefix { return v.ж.Pfx }
+
+// A compilation failure here means this code must be regenerated, with the command at the top of this file.
+var _StructWithoutPtrsViewNeedsRegeneration = StructWithoutPtrs(struct {
+	Int int
+	Pfx netaddr.IPPrefix
+}{})
+
+// View returns a readonly view of Map.
+func (p *Map) View() MapView {
+	return MapView{ж: p}
+}
+
+// MapView provides a read-only view over Map.
+//
+// Its methods should only be called if `Valid()` returns true.
+type MapView struct {
+	// ж is the underlying mutable value, named with a hard-to-type
+	// character that looks pointy like a pointer.
+	// It is named distinctively to make you think of how dangerous it is to escape
+	// to callers. You must not let callers be able to mutate it.
+	ж *Map
+}
+
+// Valid reports whether underlying value is non-nil.
+func (v MapView) Valid() bool { return v.ж != nil }
+
+// AsStruct returns a clone of the underlying value which aliases no memory with
+// the original.
+func (v MapView) AsStruct() *Map {
+	if v.ж == nil {
+		return nil
+	}
+	return v.ж.Clone()
+}
+
+func (v MapView) MarshalJSON() ([]byte, error) { return json.Marshal(v.ж) }
+
+func (v *MapView) UnmarshalJSON(b []byte) error {
+	if v.ж != nil {
+		return errors.New("already initialized")
+	}
+	if len(b) == 0 {
+		return nil
+	}
+	var x Map
+	if err := json.Unmarshal(b, &x); err != nil {
+		return err
+	}
+	v.ж = &x
+	return nil
+}
+
+func (v MapView) Int() views.Map[string, int] { return views.MapOf(v.ж.Int) }
+
+func (v MapView) SliceInt() views.MapFn[string, []int, views.Slice[int]] {
+	return views.MapFnOf(v.ж.SliceInt, func(t []int) views.Slice[int] {
+		return views.SliceOf(t)
+	})
+}
+
+func (v MapView) StructWithPtr() views.MapFn[string, *StructWithPtrs, StructWithPtrsView] {
+	return views.MapFnOf(v.ж.StructWithPtr, func(t *StructWithPtrs) StructWithPtrsView {
+		return t.View()
+	})
+}
+
+func (v MapView) StructWithoutPtr() views.MapFn[string, *StructWithoutPtrs, StructWithoutPtrsView] {
+	return views.MapFnOf(v.ж.StructWithoutPtr, func(t *StructWithoutPtrs) StructWithoutPtrsView {
+		return t.View()
+	})
+}
+
+func (v MapView) SlicesWithPtrs() views.MapFn[string, []*StructWithPtrs, views.SliceView[*StructWithPtrs, StructWithPtrsView]] {
+	return views.MapFnOf(v.ж.SlicesWithPtrs, func(t []*StructWithPtrs) views.SliceView[*StructWithPtrs, StructWithPtrsView] {
+		return views.SliceOfViews[*StructWithPtrs, StructWithPtrsView](t)
+	})
+}
+
+func (v MapView) SlicesWithoutPtrs() views.MapFn[string, []*StructWithoutPtrs, views.SliceView[*StructWithoutPtrs, StructWithoutPtrsView]] {
+	return views.MapFnOf(v.ж.SlicesWithoutPtrs, func(t []*StructWithoutPtrs) views.SliceView[*StructWithoutPtrs, StructWithoutPtrsView] {
+		return views.SliceOfViews[*StructWithoutPtrs, StructWithoutPtrsView](t)
+	})
+}
+
+func (v MapView) StructWithoutPtrKey() views.Map[StructWithoutPtrs, int] {
+	return views.MapOf(v.ж.StructWithoutPtrKey)
+}
+func (v MapView) SliceIntPtr() map[string][]*int           { panic("unsupported") }
+func (v MapView) PointerKey() map[*string]int              { panic("unsupported") }
+func (v MapView) StructWithPtrKey() map[StructWithPtrs]int { panic("unsupported") }
+
+// A compilation failure here means this code must be regenerated, with the command at the top of this file.
+var _MapViewNeedsRegeneration = Map(struct {
+	Int                 map[string]int
+	SliceInt            map[string][]int
+	StructWithPtr       map[string]*StructWithPtrs
+	StructWithoutPtr    map[string]*StructWithoutPtrs
+	SlicesWithPtrs      map[string][]*StructWithPtrs
+	SlicesWithoutPtrs   map[string][]*StructWithoutPtrs
+	StructWithoutPtrKey map[StructWithoutPtrs]int
+	SliceIntPtr         map[string][]*int
+	PointerKey          map[*string]int
+	StructWithPtrKey    map[StructWithPtrs]int
+}{})
+
+// View returns a readonly view of StructWithSlices.
+func (p *StructWithSlices) View() StructWithSlicesView {
+	return StructWithSlicesView{ж: p}
+}
+
+// StructWithSlicesView provides a read-only view over StructWithSlices.
+//
+// Its methods should only be called if `Valid()` returns true.
+type StructWithSlicesView struct {
+	// ж is the underlying mutable value, named with a hard-to-type
+	// character that looks pointy like a pointer.
+	// It is named distinctively to make you think of how dangerous it is to escape
+	// to callers. You must not let callers be able to mutate it.
+	ж *StructWithSlices
+}
+
+// Valid reports whether underlying value is non-nil.
+func (v StructWithSlicesView) Valid() bool { return v.ж != nil }
+
+// AsStruct returns a clone of the underlying value which aliases no memory with
+// the original.
+func (v StructWithSlicesView) AsStruct() *StructWithSlices {
+	if v.ж == nil {
+		return nil
+	}
+	return v.ж.Clone()
+}
+
+func (v StructWithSlicesView) MarshalJSON() ([]byte, error) { return json.Marshal(v.ж) }
+
+func (v *StructWithSlicesView) UnmarshalJSON(b []byte) error {
+	if v.ж != nil {
+		return errors.New("already initialized")
+	}
+	if len(b) == 0 {
+		return nil
+	}
+	var x StructWithSlices
+	if err := json.Unmarshal(b, &x); err != nil {
+		return err
+	}
+	v.ж = &x
+	return nil
+}
+
+func (v StructWithSlicesView) Values() views.Slice[StructWithoutPtrs] {
+	return views.SliceOf(v.ж.Values)
+}
+func (v StructWithSlicesView) ValuePointers() views.SliceView[*StructWithoutPtrs, StructWithoutPtrsView] {
+	return views.SliceOfViews[*StructWithoutPtrs, StructWithoutPtrsView](v.ж.ValuePointers)
+}
+func (v StructWithSlicesView) StructPointers() views.SliceView[*StructWithPtrs, StructWithPtrsView] {
+	return views.SliceOfViews[*StructWithPtrs, StructWithPtrsView](v.ж.StructPointers)
+}
+func (v StructWithSlicesView) Structs() StructWithPtrs    { panic("unsupported") }
+func (v StructWithSlicesView) Ints() *int                 { panic("unsupported") }
+func (v StructWithSlicesView) Slice() views.Slice[string] { return views.SliceOf(v.ж.Slice) }
+func (v StructWithSlicesView) Prefixes() views.IPPrefixSlice {
+	return views.IPPrefixSliceOf(v.ж.Prefixes)
+}
+func (v StructWithSlicesView) Data() mem.RO { return mem.B(v.ж.Data) }
+
+// A compilation failure here means this code must be regenerated, with the command at the top of this file.
+var _StructWithSlicesViewNeedsRegeneration = StructWithSlices(struct {
+	Values         []StructWithoutPtrs
+	ValuePointers  []*StructWithoutPtrs
+	StructPointers []*StructWithPtrs
+	Structs        []StructWithPtrs
+	Ints           []*int
+	Slice          []string
+	Prefixes       []netaddr.IPPrefix
+	Data           []byte
+}{})

cmd/viewer/viewer.go

@@ -0,0 +1,378 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Viewer is a tool to automate the creation of "view" wrapper types that
+// provide read-only accessor methods to underlying fields.
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"go/types"
+	"html/template"
+	"log"
+	"os"
+	"strings"
+
+	"tailscale.com/util/codegen"
+)
+
+const viewTemplateStr = `{{define "common"}}
+// View returns a readonly view of {{.StructName}}.
+func (p *{{.StructName}}) View() {{.ViewName}} {
+	return {{.ViewName}}{ж: p}
+}
+
+// {{.ViewName}} provides a read-only view over {{.StructName}}.
+//
+// Its methods should only be called if ` + "`Valid()`" + ` returns true.
+type {{.ViewName}} struct {
+	// ж is the underlying mutable value, named with a hard-to-type
+	// character that looks pointy like a pointer.
+	// It is named distinctively to make you think of how dangerous it is to escape
+	// to callers. You must not let callers be able to mutate it.
+	ж *{{.StructName}}
+}
+
+// Valid reports whether underlying value is non-nil.
+func (v {{.ViewName}}) Valid() bool { return v.ж != nil }
+
+// AsStruct returns a clone of the underlying value which aliases no memory with
+// the original.
+func (v {{.ViewName}}) AsStruct() *{{.StructName}}{ 
+	if v.ж == nil {
+		return nil
+	}
+	return v.ж.Clone()
+}
+
+func (v {{.ViewName}}) MarshalJSON() ([]byte, error) { return json.Marshal(v.ж) }
+
+func (v *{{.ViewName}}) UnmarshalJSON(b []byte) error {
+	if v.ж != nil {
+		return errors.New("already initialized")
+	}
+	if len(b) == 0 {
+		return nil
+	}
+	var x {{.StructName}}
+	if err := json.Unmarshal(b, &x); err != nil {
+		return err
+	}
+	v.ж=&x
+	return nil
+}
+
+{{end}}
+{{define "valueField"}}func (v {{.ViewName}}) {{.FieldName}}() {{.FieldType}} { return v.ж.{{.FieldName}} }
+{{end}}
+{{define "byteSliceField"}}func (v {{.ViewName}}) {{.FieldName}}() mem.RO { return mem.B(v.ж.{{.FieldName}}) }
+{{end}}
+{{define "ipPrefixSliceField"}}func (v {{.ViewName}}) {{.FieldName}}() views.IPPrefixSlice { return views.IPPrefixSliceOf(v.ж.{{.FieldName}}) }
+{{end}}
+{{define "sliceField"}}func (v {{.ViewName}}) {{.FieldName}}() views.Slice[{{.FieldType}}] { return views.SliceOf(v.ж.{{.FieldName}}) }
+{{end}}
+{{define "viewSliceField"}}func (v {{.ViewName}}) {{.FieldName}}() views.SliceView[{{.FieldType}},{{.FieldViewName}}] { return views.SliceOfViews[{{.FieldType}},{{.FieldViewName}}](v.ж.{{.FieldName}}) }
+{{end}}
+{{define "viewField"}}func (v {{.ViewName}}) {{.FieldName}}() {{.FieldType}}View { return v.ж.{{.FieldName}}.View() }
+{{end}}
+{{define "valuePointerField"}}func (v {{.ViewName}}) {{.FieldName}}() {{.FieldType}} {
+	if v.ж.{{.FieldName}} == nil {
+		return nil
+	}
+	x := *v.ж.{{.FieldName}}
+	return &x
+}
+
+{{end}}
+{{define "mapField"}}
+func(v {{.ViewName}}) {{.FieldName}}() views.Map[{{.MapKeyType}},{{.MapValueType}}] { return views.MapOf(v.ж.{{.FieldName}})}
+{{end}}
+{{define "mapFnField"}}
+func(v {{.ViewName}}) {{.FieldName}}() views.MapFn[{{.MapKeyType}},{{.MapValueType}},{{.MapValueView}}] { return views.MapFnOf(v.ж.{{.FieldName}}, func (t {{.MapValueType}}) {{.MapValueView}} {
+	return {{.MapFn}}
+})}
+{{end}}
+{{define "unsupportedField"}}func(v {{.ViewName}}) {{.FieldName}}() {{.FieldType}} {panic("unsupported")}
+{{end}}
+{{define "stringFunc"}}func(v {{.ViewName}}) String() string { return v.ж.String() }
+{{end}}
+{{define "equalFunc"}}func(v {{.ViewName}}) Equal(v2 {{.ViewName}}) bool { return v.ж.Equal(v2.ж) }
+{{end}}
+`
+
+var viewTemplate *template.Template
+
+func init() {
+	viewTemplate = template.Must(template.New("view").Parse(viewTemplateStr))
+}
+
+func requiresCloning(t types.Type) (shallow, deep bool, base types.Type) {
+	switch v := t.(type) {
+	case *types.Pointer:
+		_, deep, base = requiresCloning(v.Elem())
+		return true, deep, base
+	case *types.Slice:
+		_, deep, base = requiresCloning(v.Elem())
+		return true, deep, base
+	}
+	p := codegen.ContainsPointers(t)
+	return p, p, t
+}
+
+func genView(buf *bytes.Buffer, it *codegen.ImportTracker, typ *types.Named, thisPkg *types.Package) {
+	t, ok := typ.Underlying().(*types.Struct)
+	if !ok || codegen.IsViewType(t) {
+		return
+	}
+	it.Import("encoding/json")
+	it.Import("errors")
+
+	args := struct {
+		StructName    string
+		ViewName      string
+		FieldName     string
+		FieldType     string
+		FieldViewName string
+
+		MapKeyType   string
+		MapValueType string
+		MapValueView string
+		MapFn        string
+	}{
+		StructName: typ.Obj().Name(),
+		ViewName:   typ.Obj().Name() + "View",
+	}
+
+	writeTemplate := func(name string) {
+		if err := viewTemplate.ExecuteTemplate(buf, name, args); err != nil {
+			log.Fatal(err)
+		}
+	}
+	writeTemplate("common")
+	for i := 0; i < t.NumFields(); i++ {
+		f := t.Field(i)
+		fname := f.Name()
+		if !f.Exported() {
+			continue
+		}
+		args.FieldName = fname
+		fieldType := f.Type()
+		if codegen.IsInvalid(fieldType) {
+			continue
+		}
+		if !codegen.ContainsPointers(fieldType) || codegen.IsViewType(fieldType) || codegen.HasNoClone(t.Tag(i)) {
+			args.FieldType = it.QualifiedName(fieldType)
+			writeTemplate("valueField")
+			continue
+		}
+		switch underlying := fieldType.Underlying().(type) {
+		case *types.Slice:
+			slice := underlying
+			elem := slice.Elem()
+			args.FieldType = it.QualifiedName(elem)
+			switch elem.String() {
+			case "byte":
+				it.Import("go4.org/mem")
+				writeTemplate("byteSliceField")
+			case "inet.af/netaddr.IPPrefix":
+				it.Import("tailscale.com/types/views")
+				writeTemplate("ipPrefixSliceField")
+			default:
+				it.Import("tailscale.com/types/views")
+				shallow, deep, base := requiresCloning(elem)
+				if deep {
+					if _, isPtr := elem.(*types.Pointer); isPtr {
+						args.FieldViewName = it.QualifiedName(base) + "View"
+						writeTemplate("viewSliceField")
+					} else {
+						writeTemplate("unsupportedField")
+					}
+					continue
+				} else if shallow {
+					if _, isBasic := base.(*types.Basic); isBasic {
+						writeTemplate("unsupportedField")
+					} else {
+						args.FieldViewName = it.QualifiedName(base) + "View"
+						writeTemplate("viewSliceField")
+					}
+					continue
+				}
+				writeTemplate("sliceField")
+			}
+			continue
+		case *types.Struct, *types.Named:
+			strucT := underlying
+			args.FieldType = it.QualifiedName(fieldType)
+			if codegen.ContainsPointers(strucT) {
+				writeTemplate("viewField")
+				continue
+			}
+			writeTemplate("valueField")
+			continue
+		case *types.Map:
+			m := underlying
+			args.FieldType = it.QualifiedName(fieldType)
+			shallow, deep, key := requiresCloning(m.Key())
+			if shallow || deep {
+				writeTemplate("unsupportedField")
+				continue
+			}
+			args.MapKeyType = it.QualifiedName(key)
+			mElem := m.Elem()
+			var template string
+			switch u := mElem.(type) {
+			case *types.Basic:
+				template = "mapField"
+				args.MapValueType = it.QualifiedName(mElem)
+			case *types.Slice:
+				slice := u
+				sElem := slice.Elem()
+				switch x := sElem.(type) {
+				case *types.Basic:
+					args.MapValueView = fmt.Sprintf("views.Slice[%v]", sElem)
+					args.MapValueType = "[]" + sElem.String()
+					args.MapFn = "views.SliceOf(t)"
+					template = "mapFnField"
+				case *types.Pointer:
+					ptr := x
+					pElem := ptr.Elem()
+					switch pElem.(type) {
+					case *types.Struct, *types.Named:
+						ptrType := it.QualifiedName(ptr)
+						viewType := it.QualifiedName(pElem) + "View"
+						args.MapFn = fmt.Sprintf("views.SliceOfViews[%v,%v](t)", ptrType, viewType)
+						args.MapValueView = fmt.Sprintf("views.SliceView[%v,%v]", ptrType, viewType)
+						args.MapValueType = "[]" + ptrType
+						template = "mapFnField"
+					default:
+						template = "unsupportedField"
+					}
+				default:
+					template = "unsupportedField"
+				}
+			case *types.Pointer:
+				ptr := u
+				pElem := ptr.Elem()
+				switch pElem.(type) {
+				case *types.Struct, *types.Named:
+					args.MapValueType = it.QualifiedName(ptr)
+					args.MapValueView = it.QualifiedName(pElem) + "View"
+					args.MapFn = "t.View()"
+					template = "mapFnField"
+				default:
+					template = "unsupportedField"
+				}
+			default:
+				template = "unsupportedField"
+			}
+			writeTemplate(template)
+			continue
+		case *types.Pointer:
+			ptr := underlying
+			_, deep, base := requiresCloning(ptr)
+			if deep {
+				args.FieldType = it.QualifiedName(base)
+				writeTemplate("viewField")
+			} else {
+				args.FieldType = it.QualifiedName(ptr)
+				writeTemplate("valuePointerField")
+			}
+			continue
+		}
+		writeTemplate("unsupportedField")
+	}
+	for i := 0; i < typ.NumMethods(); i++ {
+		f := typ.Method(i)
+		if !f.Exported() {
+			continue
+		}
+		sig, ok := f.Type().(*types.Signature)
+		if !ok {
+			continue
+		}
+
+		switch f.Name() {
+		case "Clone", "View":
+			continue // "AsStruct"
+		case "String":
+			writeTemplate("stringFunc")
+			continue
+		case "Equal":
+			if sig.Results().Len() == 1 && sig.Results().At(0).Type().String() == "bool" {
+				writeTemplate("equalFunc")
+				continue
+			}
+		}
+	}
+	fmt.Fprintf(buf, "\n")
+	buf.Write(codegen.AssertStructUnchanged(t, args.StructName, "View", it))
+}
+
+var (
+	flagTypes     = flag.String("type", "", "comma-separated list of types; required")
+	flagBuildTags = flag.String("tags", "", "compiler build tags to apply")
+	flagCloneFunc = flag.Bool("clonefunc", false, "add a top-level Clone func")
+)
+
+func main() {
+	log.SetFlags(0)
+	log.SetPrefix("viewer: ")
+	flag.Parse()
+	if len(*flagTypes) == 0 {
+		flag.Usage()
+		os.Exit(2)
+	}
+	typeNames := strings.Split(*flagTypes, ",")
+
+	var flagArgs []string
+	flagArgs = append(flagArgs, fmt.Sprintf("-clonefunc=%v", *flagCloneFunc))
+	if *flagTypes != "" {
+		flagArgs = append(flagArgs, "-type="+*flagTypes)
+	}
+	if *flagBuildTags != "" {
+		flagArgs = append(flagArgs, "-tags="+*flagBuildTags)
+	}
+	pkg, namedTypes, err := codegen.LoadTypes(*flagBuildTags, ".")
+	if err != nil {
+		log.Fatal(err)
+	}
+	it := codegen.NewImportTracker(pkg.Types)
+
+	buf := new(bytes.Buffer)
+	fmt.Fprintf(buf, `//go:generate go run tailscale.com/cmd/cloner  %s`, strings.Join(flagArgs, " "))
+	fmt.Fprintln(buf)
+	runCloner := false
+	for _, typeName := range typeNames {
+		typ, ok := namedTypes[typeName]
+		if !ok {
+			log.Fatalf("could not find type %s", typeName)
+		}
+		var hasClone bool
+		for i, n := 0, typ.NumMethods(); i < n; i++ {
+			if typ.Method(i).Name() == "Clone" {
+				hasClone = true
+				break
+			}
+		}
+		if !hasClone {
+			runCloner = true
+		}
+		genView(buf, it, typ, pkg.Types)
+	}
+	out := pkg.Name + "_view.go"
+	if err := codegen.WritePackageFile("tailscale/cmd/viewer", pkg, out, it, buf); err != nil {
+		log.Fatal(err)
+	}
+	if runCloner {
+		// When a new pacakge is added or when existing generated files have
+		// been deleted, we might run into a case where tailscale.com/cmd/cloner
+		// has not run yet. We detect this by verifying that all the structs we
+		// interacted with have had Clone method already generated. If they
+		// haven't we ask the caller to rerun generation again so that those get
+		// generated.
+		log.Printf("%v requires regeneration. Please run go generate again", pkg.Name+"_clone.go")
+	}
+}

control/controlclient/auto.go

@@ -6,6 +6,7 @@ package controlclient
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"net/http"
 	"sync"
@@ -41,30 +42,31 @@ func (g *LoginGoal) sendLogoutError(err error) {
 	}
 }
 
+var _ Client = (*Auto)(nil)
+
 // Auto connects to a tailcontrol server for a node.
 // It's a concrete implementation of the Client interface.
 type Auto struct {
-	direct   *Direct // our interface to the server APIs
-	timeNow  func() time.Time
-	logf     logger.Logf
-	expiry   *time.Time
-	closed   bool
-	newMapCh chan struct{} // readable when we must restart a map request
+	direct     *Direct // our interface to the server APIs
+	timeNow    func() time.Time
+	logf       logger.Logf
+	expiry     *time.Time
+	closed     bool
+	newMapCh   chan struct{} // readable when we must restart a map request
+	statusFunc func(Status)  // called to update Client status; always non-nil
 
 	unregisterHealthWatch func()
 
-	mu         sync.Mutex   // mutex guards the following fields
-	statusFunc func(Status) // called to update Client status
+	mu sync.Mutex // mutex guards the following fields
 
 	paused          bool // whether we should stop making HTTP requests
 	unpauseWaiters  []chan struct{}
 	loggedIn        bool       // true if currently logged in
 	loginGoal       *LoginGoal // non-nil if some login activity is desired
 	synced          bool       // true if our netmap is up-to-date
-	hostinfo        *tailcfg.Hostinfo
-	inPollNetMap    bool // true if currently running a PollNetMap
-	inLiteMapUpdate bool // true if a lite (non-streaming) map request is outstanding
-	inSendStatus    int  // number of sendStatus calls currently in progress
+	inPollNetMap    bool       // true if currently running a PollNetMap
+	inLiteMapUpdate bool       // true if a lite (non-streaming) map request is outstanding
+	inSendStatus    int        // number of sendStatus calls currently in progress
 	state           State
 
 	authCtx    context.Context // context used for auth requests
@@ -91,6 +93,9 @@ func NewNoStart(opts Options) (*Auto, error) {
 	if err != nil {
 		return nil, err
 	}
+	if opts.Status == nil {
+		return nil, errors.New("missing required Options.Status")
+	}
 	if opts.Logf == nil {
 		opts.Logf = func(fmt string, args ...any) {}
 	}
@@ -98,13 +103,14 @@ func NewNoStart(opts Options) (*Auto, error) {
 		opts.TimeNow = time.Now
 	}
 	c := &Auto{
-		direct:   direct,
-		timeNow:  opts.TimeNow,
-		logf:     opts.Logf,
-		newMapCh: make(chan struct{}, 1),
-		quit:     make(chan struct{}),
-		authDone: make(chan struct{}),
-		mapDone:  make(chan struct{}),
+		direct:     direct,
+		timeNow:    opts.TimeNow,
+		logf:       opts.Logf,
+		newMapCh:   make(chan struct{}, 1),
+		quit:       make(chan struct{}),
+		authDone:   make(chan struct{}),
+		mapDone:    make(chan struct{}),
+		statusFunc: opts.Status,
 	}
 	c.authCtx, c.authCancel = context.WithCancel(context.Background())
 	c.mapCtx, c.mapCancel = context.WithCancel(context.Background())
@@ -290,6 +296,7 @@ func (c *Auto) authRoutine() {
 		}
 
 		if goal == nil {
+			health.SetAuthRoutineInError(nil)
 			// Wait for user to Login or Logout.
 			<-ctx.Done()
 			c.logf("[v1] authRoutine: context done.")
@@ -297,6 +304,7 @@ func (c *Auto) authRoutine() {
 		}
 
 		if !goal.wantLoggedIn {
+			health.SetAuthRoutineInError(nil)
 			err := c.direct.TryLogout(ctx)
 			goal.sendLogoutError(err)
 			if err != nil {
@@ -335,6 +343,7 @@ func (c *Auto) authRoutine() {
 				f = "TryLogin"
 			}
 			if err != nil {
+				health.SetAuthRoutineInError(err)
 				report(err, f)
 				bo.BackOff(ctx, err)
 				continue
@@ -359,6 +368,7 @@ func (c *Auto) authRoutine() {
 			}
 
 			// success
+			health.SetAuthRoutineInError(nil)
 			c.mu.Lock()
 			c.loggedIn = true
 			c.loginGoal = nil
@@ -459,7 +469,7 @@ func (c *Auto) mapRoutine() {
 			c.mu.Unlock()
 			health.SetInPollNetMap(false)
 
-			err := c.direct.PollNetMap(ctx, -1, func(nm *netmap.NetworkMap) {
+			err := c.direct.PollNetMap(ctx, func(nm *netmap.NetworkMap) {
 				health.SetInPollNetMap(true)
 				c.mu.Lock()
 
@@ -528,13 +538,6 @@ func (c *Auto) AuthCantContinue() bool {
 	return !c.loggedIn && (c.loginGoal == nil || c.loginGoal.url != "")
 }
 
-// SetStatusFunc sets fn as the callback to run on any status change.
-func (c *Auto) SetStatusFunc(fn func(Status)) {
-	c.mu.Lock()
-	c.statusFunc = fn
-	c.mu.Unlock()
-}
-
 func (c *Auto) SetHostinfo(hi *tailcfg.Hostinfo) {
 	if hi == nil {
 		panic("nil Hostinfo")
@@ -555,19 +558,20 @@ func (c *Auto) SetNetInfo(ni *tailcfg.NetInfo) {
 	if !c.direct.SetNetInfo(ni) {
 		return
 	}
-	c.logf("NetInfo: %v", ni)
 
-	// Send new Hostinfo (which includes NetInfo) to server
+	// Send new NetInfo to server
 	c.sendNewMapRequest()
 }
 
 func (c *Auto) sendStatus(who string, err error, url string, nm *netmap.NetworkMap) {
 	c.mu.Lock()
+	if c.closed {
+		c.mu.Unlock()
+		return
+	}
 	state := c.state
 	loggedIn := c.loggedIn
 	synced := c.synced
-	statusFunc := c.statusFunc
-	hi := c.hostinfo
 	c.inSendStatus++
 	c.mu.Unlock()
 
@@ -595,13 +599,10 @@ func (c *Auto) sendStatus(who string, err error, url string, nm *netmap.NetworkM
 		URL:            url,
 		Persist:        p,
 		NetMap:         nm,
-		Hostinfo:       hi,
 		State:          state,
 		Err:            err,
 	}
-	if statusFunc != nil {
-		statusFunc(new)
-	}
+	c.statusFunc(new)
 
 	c.mu.Lock()
 	c.inSendStatus--
@@ -666,11 +667,8 @@ func (c *Auto) SetExpirySooner(ctx context.Context, expiry time.Time) error {
 // them to the control server if they've changed.
 //
 // It does not retain the provided slice.
-//
-// The localPort field is unused except for integration tests in
-// another repo.
-func (c *Auto) UpdateEndpoints(localPort uint16, endpoints []tailcfg.Endpoint) {
-	changed := c.direct.SetEndpoints(localPort, endpoints)
+func (c *Auto) UpdateEndpoints(endpoints []tailcfg.Endpoint) {
+	changed := c.direct.SetEndpoints(endpoints)
 	if changed {
 		c.sendNewMapRequest()
 	}
@@ -685,7 +683,6 @@ func (c *Auto) Shutdown() {
 	direct := c.direct
 	if !closed {
 		c.closed = true
-		c.statusFunc = nil
 	}
 	c.mu.Unlock()
 

control/controlclient/client.go

@@ -11,8 +11,6 @@ package controlclient
 
 import (
 	"context"
-	"net/http"
-	"time"
 
 	"tailscale.com/tailcfg"
 )
@@ -29,9 +27,6 @@ const (
 // Currently this is done through a pair of polling https requests in
 // the Auto client, but that might change eventually.
 type Client interface {
-	// SetStatusFunc provides a callback to call when control sends us
-	// a message.
-	SetStatusFunc(func(Status))
 	// Shutdown closes this session, which should not be used any further
 	// afterwards.
 	Shutdown()
@@ -47,9 +42,6 @@ type Client interface {
 	// Logout starts a synchronous logout process. It doesn't return
 	// until the logout operation has been completed.
 	Logout(context.Context) error
-	// SetExpirySooner sets the node's expiry time via the controlclient,
-	// as long as it's shorter than the current expiry time.
-	SetExpirySooner(context.Context, time.Time) error
 	// SetPaused pauses or unpauses the controlclient activity as much
 	// as possible, without losing its internal state, to minimize
 	// unnecessary network activity.
@@ -75,17 +67,10 @@ type Client interface {
 	SetNetInfo(*tailcfg.NetInfo)
 	// UpdateEndpoints changes the Endpoint structure that will be sent
 	// in subsequent node registration requests.
-	// The localPort field is unused except for integration tests in another repo.
 	// TODO: a server-side change would let us simply upload this
 	// in a separate http request. It has nothing to do with the rest of
 	// the state machine.
-	UpdateEndpoints(localPort uint16, endpoints []tailcfg.Endpoint)
-	// SetDNS sends the SetDNSRequest request to the control plane server,
-	// requesting a DNS record be created or updated.
-	SetDNS(context.Context, *tailcfg.SetDNSRequest) error
-	// DoNoiseRequest sends an HTTP request to the control plane
-	// over the Noise transport.
-	DoNoiseRequest(*http.Request) (*http.Response, error)
+	UpdateEndpoints(endpoints []tailcfg.Endpoint)
 }
 
 // UserVisibleError is an error that should be shown to users.

control/controlclient/controlclient_test.go

@@ -22,7 +22,7 @@ func fieldsOf(t reflect.Type) (fields []string) {
 
 func TestStatusEqual(t *testing.T) {
 	// Verify that the Equal method stays in sync with reality
-	equalHandles := []string{"LoginFinished", "LogoutFinished", "Err", "URL", "NetMap", "State", "Persist", "Hostinfo"}
+	equalHandles := []string{"LoginFinished", "LogoutFinished", "Err", "URL", "NetMap", "State", "Persist"}
 	if have := fieldsOf(reflect.TypeOf(Status{})); !reflect.DeepEqual(have, equalHandles) {
 		t.Errorf("Status.Equal check might be out of sync\nfields: %q\nhandled: %q\n",
 			have, equalHandles)

control/controlclient/direct.go

@@ -26,7 +26,6 @@ import (
 	"time"
 
 	"go4.org/mem"
-	"golang.org/x/sync/singleflight"
 	"inet.af/netaddr"
 	"tailscale.com/control/controlknobs"
 	"tailscale.com/envknob"
@@ -34,12 +33,13 @@ import (
 	"tailscale.com/hostinfo"
 	"tailscale.com/ipn/ipnstate"
 	"tailscale.com/log/logheap"
+	"tailscale.com/logtail"
 	"tailscale.com/net/dnscache"
 	"tailscale.com/net/dnsfallback"
 	"tailscale.com/net/interfaces"
-	"tailscale.com/net/netns"
 	"tailscale.com/net/netutil"
 	"tailscale.com/net/tlsdial"
+	"tailscale.com/net/tsdial"
 	"tailscale.com/net/tshttpproxy"
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/key"
@@ -49,6 +49,7 @@ import (
 	"tailscale.com/types/persist"
 	"tailscale.com/util/clientmetric"
 	"tailscale.com/util/multierr"
+	"tailscale.com/util/singleflight"
 	"tailscale.com/util/systemd"
 	"tailscale.com/wgengine/monitor"
 )
@@ -56,7 +57,8 @@ import (
 // Direct is the client that connects to a tailcontrol server for a node.
 type Direct struct {
 	httpc                  *http.Client // HTTP client used to talk to tailcontrol
-	serverURL              string       // URL of the tailcontrol server
+	dialer                 *tsdial.Dialer
+	serverURL              string // URL of the tailcontrol server
 	timeNow                func() time.Time
 	lastPrintMap           time.Time
 	newDecompressor        func() (Decompressor, error)
@@ -75,18 +77,17 @@ type Direct struct {
 	serverKey      key.MachinePublic // original ("legacy") nacl crypto_box-based public key
 	serverNoiseKey key.MachinePublic
 
-	sfGroup     singleflight.Group // protects noiseClient creation.
+	sfGroup     singleflight.Group[struct{}, *noiseClient] // protects noiseClient creation.
 	noiseClient *noiseClient
 
-	persist      persist.Persist
-	authKey      string
-	tryingNewKey key.NodePrivate
-	expiry       *time.Time
-	// hostinfo is mutated in-place while mu is held.
+	persist       persist.Persist
+	authKey       string
+	tryingNewKey  key.NodePrivate
+	expiry        *time.Time
 	hostinfo      *tailcfg.Hostinfo // always non-nil
+	netinfo       *tailcfg.NetInfo
 	endpoints     []tailcfg.Endpoint
 	everEndpoints bool   // whether we've ever had non-empty endpoints
-	localPort     uint16 // or zero to mean auto
 	lastPingURL   string // last PingRequest.URL received, for dup suppression
 }
 
@@ -105,6 +106,10 @@ type Options struct {
 	DebugFlags           []string         // debug settings to send to control
 	LinkMonitor          *monitor.Mon     // optional link monitor
 	PopBrowserURL        func(url string) // optional func to open browser
+	Dialer               *tsdial.Dialer   // non-nil
+
+	// Status is called when there's a change in status.
+	Status func(Status)
 
 	// KeepSharerAndUserSplit controls whether the client
 	// understands Node.Sharer. If false, the Sharer is mapped to the User.
@@ -121,11 +126,10 @@ type Options struct {
 	Pinger Pinger
 }
 
-// Pinger is a subset of the wgengine.Engine interface, containing just the Ping method.
+// Pinger is the LocalBackend.Ping method.
 type Pinger interface {
-	// Ping is a request to start a discovery or TSMP ping with the peer handling
-	// the given IP and then call cb with its ping latency & method.
-	Ping(ip netaddr.IP, useTSMP bool, cb func(*ipnstate.PingResult))
+	// Ping is a request to do a ping with the peer handling the given IP.
+	Ping(ctx context.Context, ip netaddr.IP, pingType tailcfg.PingType) (*ipnstate.PingResult, error)
 }
 
 type Decompressor interface {
@@ -169,13 +173,12 @@ func NewDirect(opts Options) (*Direct, error) {
 			UseLastGood:      true,
 			LookupIPFallback: dnsfallback.Lookup,
 		}
-		dialer := netns.NewDialer(opts.Logf)
 		tr := http.DefaultTransport.(*http.Transport).Clone()
 		tr.Proxy = tshttpproxy.ProxyFromEnvironment
 		tshttpproxy.SetTransportGetProxyConnectHeader(tr)
 		tr.TLSClientConfig = tlsdial.Config(serverURL.Hostname(), tr.TLSClientConfig)
-		tr.DialContext = dnscache.Dialer(dialer.DialContext, dnsCache)
-		tr.DialTLSContext = dnscache.TLSDialer(dialer.DialContext, dnsCache, tr.TLSClientConfig)
+		tr.DialContext = dnscache.Dialer(opts.Dialer.SystemDial, dnsCache)
+		tr.DialTLSContext = dnscache.TLSDialer(opts.Dialer.SystemDial, dnsCache, tr.TLSClientConfig)
 		tr.ForceAttemptHTTP2 = true
 		// Disable implicit gzip compression; the various
 		// handlers (register, map, set-dns, etc) do their own
@@ -201,11 +204,17 @@ func NewDirect(opts Options) (*Direct, error) {
 		skipIPForwardingCheck:  opts.SkipIPForwardingCheck,
 		pinger:                 opts.Pinger,
 		popBrowser:             opts.PopBrowserURL,
+		dialer:                 opts.Dialer,
 	}
 	if opts.Hostinfo == nil {
 		c.SetHostinfo(hostinfo.New())
 	} else {
+		ni := opts.Hostinfo.NetInfo
+		opts.Hostinfo.NetInfo = nil
 		c.SetHostinfo(opts.Hostinfo)
+		if ni != nil {
+			c.SetNetInfo(ni)
+		}
 	}
 	return c, nil
 }
@@ -250,14 +259,11 @@ func (c *Direct) SetNetInfo(ni *tailcfg.NetInfo) bool {
 	c.mu.Lock()
 	defer c.mu.Unlock()
 
-	if c.hostinfo == nil {
-		c.logf("[unexpected] SetNetInfo called with no HostInfo; ignoring NetInfo update: %+v", ni)
+	if reflect.DeepEqual(ni, c.netinfo) {
 		return false
 	}
-	if reflect.DeepEqual(ni, c.hostinfo.NetInfo) {
-		return false
-	}
-	c.hostinfo.NetInfo = ni.Clone()
+	c.netinfo = ni.Clone()
+	c.logf("NetInfo: %v", ni)
 	return true
 }
 
@@ -334,6 +340,14 @@ type httpClient interface {
 	Do(req *http.Request) (*http.Response, error)
 }
 
+// hostInfoLocked returns a Clone of c.hostinfo and c.netinfo.
+// It must only be called with c.mu held.
+func (c *Direct) hostInfoLocked() *tailcfg.Hostinfo {
+	hi := c.hostinfo.Clone()
+	hi.NetInfo = c.netinfo.Clone()
+	return hi
+}
+
 func (c *Direct) doLogin(ctx context.Context, opt loginOpt) (mustRegen bool, newURL string, err error) {
 	c.mu.Lock()
 	persist := c.persist
@@ -341,7 +355,7 @@ func (c *Direct) doLogin(ctx context.Context, opt loginOpt) (mustRegen bool, new
 	serverKey := c.serverKey
 	serverNoiseKey := c.serverNoiseKey
 	authKey := c.authKey
-	hi := c.hostinfo.Clone()
+	hi := c.hostInfoLocked()
 	backendLogID := hi.BackendLogID
 	expired := c.expiry != nil && !c.expiry.IsZero() && c.expiry.Before(c.timeNow())
 	c.mu.Unlock()
@@ -375,7 +389,7 @@ func (c *Direct) doLogin(ctx context.Context, opt loginOpt) (mustRegen bool, new
 		if err != nil {
 			return regen, opt.URL, err
 		}
-		c.logf("control server key %s from %s", serverKey.ShortString(), c.serverURL)
+		c.logf("control server key from %s: ts2021=%s, legacy=%v", c.serverURL, keys.PublicKey.ShortString(), keys.LegacyPublicKey.ShortString())
 
 		c.mu.Lock()
 		c.serverKey = keys.LegacyPublicKey
@@ -574,20 +588,19 @@ func sameEndpoints(a, b []tailcfg.Endpoint) bool {
 // whether they've changed.
 //
 // It does not retain the provided slice.
-func (c *Direct) newEndpoints(localPort uint16, endpoints []tailcfg.Endpoint) (changed bool) {
+func (c *Direct) newEndpoints(endpoints []tailcfg.Endpoint) (changed bool) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
 
 	// Nothing new?
-	if c.localPort == localPort && sameEndpoints(c.endpoints, endpoints) {
+	if sameEndpoints(c.endpoints, endpoints) {
 		return false // unchanged
 	}
 	var epStrs []string
 	for _, ep := range endpoints {
 		epStrs = append(epStrs, ep.Addr.String())
 	}
-	c.logf("[v2] client.newEndpoints(%v, %v)", localPort, epStrs)
-	c.localPort = localPort
+	c.logf("[v2] client.newEndpoints(%v)", epStrs)
 	c.endpoints = append(c.endpoints[:0], endpoints...)
 	if len(endpoints) > 0 {
 		c.everEndpoints = true
@@ -598,28 +611,37 @@ func (c *Direct) newEndpoints(localPort uint16, endpoints []tailcfg.Endpoint) (c
 // SetEndpoints updates the list of locally advertised endpoints.
 // It won't be replicated to the server until a *fresh* call to PollNetMap().
 // You don't need to restart PollNetMap if we return changed==false.
-func (c *Direct) SetEndpoints(localPort uint16, endpoints []tailcfg.Endpoint) (changed bool) {
+func (c *Direct) SetEndpoints(endpoints []tailcfg.Endpoint) (changed bool) {
 	// (no log message on function entry, because it clutters the logs
 	//  if endpoints haven't changed. newEndpoints() will log it.)
-	return c.newEndpoints(localPort, endpoints)
+	return c.newEndpoints(endpoints)
 }
 
 func inTest() bool { return flag.Lookup("test.v") != nil }
 
 // PollNetMap makes a /map request to download the network map, calling cb with
 // each new netmap.
-//
-// maxPolls is how many network maps to download; common values are 1
-// or -1 (to keep a long-poll query open to the server).
-func (c *Direct) PollNetMap(ctx context.Context, maxPolls int, cb func(*netmap.NetworkMap)) error {
-	return c.sendMapRequest(ctx, maxPolls, cb)
+func (c *Direct) PollNetMap(ctx context.Context, cb func(*netmap.NetworkMap)) error {
+	return c.sendMapRequest(ctx, -1, false, cb)
+}
+
+// FetchNetMap fetches the netmap once.
+func (c *Direct) FetchNetMap(ctx context.Context) (*netmap.NetworkMap, error) {
+	var ret *netmap.NetworkMap
+	err := c.sendMapRequest(ctx, 1, false, func(nm *netmap.NetworkMap) {
+		ret = nm
+	})
+	if err == nil && ret == nil {
+		return nil, errors.New("[unexpected] sendMapRequest success without callback")
+	}
+	return ret, err
 }
 
 // SendLiteMapUpdate makes a /map request to update the server of our latest state,
 // but does not fetch anything. It returns an error if the server did not return a
 // successful 200 OK response.
 func (c *Direct) SendLiteMapUpdate(ctx context.Context) error {
-	return c.sendMapRequest(ctx, 1, nil)
+	return c.sendMapRequest(ctx, 1, false, nil)
 }
 
 // If we go more than pollTimeout without hearing from the server,
@@ -628,7 +650,7 @@ func (c *Direct) SendLiteMapUpdate(ctx context.Context) error {
 const pollTimeout = 120 * time.Second
 
 // cb nil means to omit peers.
-func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*netmap.NetworkMap)) error {
+func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, readOnly bool, cb func(*netmap.NetworkMap)) error {
 	metricMapRequests.Add(1)
 	metricMapRequestsActive.Add(1)
 	defer metricMapRequestsActive.Add(-1)
@@ -643,9 +665,8 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*netm
 	serverURL := c.serverURL
 	serverKey := c.serverKey
 	serverNoiseKey := c.serverNoiseKey
-	hi := c.hostinfo.Clone()
+	hi := c.hostInfoLocked()
 	backendLogID := hi.BackendLogID
-	localPort := c.localPort
 	var epStrs []string
 	var epTypes []tailcfg.EndpointType
 	for _, ep := range c.endpoints {
@@ -671,7 +692,7 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*netm
 	}
 
 	allowStream := maxPolls != 1
-	c.logf("[v1] PollNetMap: stream=%v :%v ep=%v", allowStream, localPort, epStrs)
+	c.logf("[v1] PollNetMap: stream=%v ep=%v", allowStream, epStrs)
 
 	vlogf := logger.Discard
 	if Debug.NetMap {
@@ -691,6 +712,16 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*netm
 		Hostinfo:      hi,
 		DebugFlags:    c.debugFlags,
 		OmitPeers:     cb == nil,
+
+		// On initial startup before we know our endpoints, set the ReadOnly flag
+		// to tell the control server not to distribute out our (empty) endpoints to peers.
+		// Presumably we'll learn our endpoints in a half second and do another post
+		// with useful results. The first POST just gets us the DERP map which we
+		// need to do the STUN queries to discover our endpoints.
+		// TODO(bradfitz): we skip this optimization in tests, though,
+		// because the e2e tests are currently hyperspecific about the
+		// ordering of things. The e2e tests need love.
+		ReadOnly: readOnly || (len(epStrs) == 0 && !everEndpoints && !inTest()),
 	}
 	var extraDebugFlags []string
 	if hi != nil && c.linkMon != nil && !c.skipIPForwardingCheck &&
@@ -713,17 +744,6 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*netm
 	if c.newDecompressor != nil {
 		request.Compress = "zstd"
 	}
-	// On initial startup before we know our endpoints, set the ReadOnly flag
-	// to tell the control server not to distribute out our (empty) endpoints to peers.
-	// Presumably we'll learn our endpoints in a half second and do another post
-	// with useful results. The first POST just gets us the DERP map which we
-	// need to do the STUN queries to discover our endpoints.
-	// TODO(bradfitz): we skip this optimization in tests, though,
-	// because the e2e tests are currently hyperspecific about the
-	// ordering of things. The e2e tests need love.
-	if len(epStrs) == 0 && !everEndpoints && !inTest() {
-		request.ReadOnly = true
-	}
 
 	bodyData, err := encode(request, serverKey, serverNoiseKey, machinePrivKey)
 	if err != nil {
@@ -850,7 +870,7 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*netm
 
 		if pr := resp.PingRequest; pr != nil && c.isUniquePingRequest(pr) {
 			metricMapResponsePings.Add(1)
-			go answerPing(c.logf, c.httpc, pr)
+			go answerPing(c.logf, c.httpc, pr, c.pinger)
 		}
 		if u := resp.PopBrowserURL; u != "" && u != sess.lastPopBrowserURL {
 			sess.lastPopBrowserURL = u
@@ -895,6 +915,9 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*netm
 				c.logf("exiting process with status %v per controlplane", *code)
 				os.Exit(*code)
 			}
+			if resp.Debug.DisableLogTail {
+				logtail.Disable()
+			}
 			if resp.Debug.LogHeapPprof {
 				go logheap.LogHeap(resp.Debug.LogHeapURL)
 			}
@@ -925,14 +948,6 @@ func (c *Direct) sendMapRequest(ctx context.Context, maxPolls int, cb func(*netm
 			nm.SelfNode.Capabilities = nil
 		}
 
-		// Get latest localPort. This might've changed if
-		// a lite map update occurred meanwhile. This only affects
-		// the end-to-end test.
-		// TODO(bradfitz): remove the NetworkMap.LocalPort field entirely.
-		c.mu.Lock()
-		nm.LocalPort = c.localPort
-		c.mu.Unlock()
-
 		// Occasionally print the netmap header.
 		// This is handy for debugging, and our logs processing
 		// pipeline depends on it. (TODO: Remove this dependency.)
@@ -1181,29 +1196,44 @@ func (c *Direct) isUniquePingRequest(pr *tailcfg.PingRequest) bool {
 	return true
 }
 
-func answerPing(logf logger.Logf, c *http.Client, pr *tailcfg.PingRequest) {
+func answerPing(logf logger.Logf, c *http.Client, pr *tailcfg.PingRequest, pinger Pinger) {
 	if pr.URL == "" {
 		logf("invalid PingRequest with no URL")
 		return
 	}
+	if pr.Types == "" {
+		answerHeadPing(logf, c, pr)
+		return
+	}
+	for _, t := range strings.Split(pr.Types, ",") {
+		switch pt := tailcfg.PingType(t); pt {
+		case tailcfg.PingTSMP, tailcfg.PingDisco, tailcfg.PingICMP, tailcfg.PingPeerAPI:
+			go doPingerPing(logf, c, pr, pinger, pt)
+		default:
+			logf("unsupported ping request type: %q", t)
+		}
+	}
+}
+
+func answerHeadPing(logf logger.Logf, c *http.Client, pr *tailcfg.PingRequest) {
 	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
 	defer cancel()
 
 	req, err := http.NewRequestWithContext(ctx, "HEAD", pr.URL, nil)
 	if err != nil {
-		logf("http.NewRequestWithContext(%q): %v", pr.URL, err)
+		logf("answerHeadPing: NewRequestWithContext: %v", err)
 		return
 	}
 	if pr.Log {
-		logf("answerPing: sending ping to %v ...", pr.URL)
+		logf("answerHeadPing: sending HEAD ping to %v ...", pr.URL)
 	}
 	t0 := time.Now()
 	_, err = c.Do(req)
 	d := time.Since(t0).Round(time.Millisecond)
 	if err != nil {
-		logf("answerPing error: %v to %v (after %v)", err, pr.URL, d)
+		logf("answerHeadPing error: %v to %v (after %v)", err, pr.URL, d)
 	} else if pr.Log {
-		logf("answerPing complete to %v (after %v)", pr.URL, d)
+		logf("answerHeadPing complete to %v (after %v)", pr.URL, d)
 	}
 }
 
@@ -1250,13 +1280,12 @@ func (c *Direct) getNoiseClient() (*noiseClient, error) {
 	if nc != nil {
 		return nc, nil
 	}
-	np, err, _ := c.sfGroup.Do("noise", func() (any, error) {
+	nc, err, _ := c.sfGroup.Do(struct{}{}, func() (*noiseClient, error) {
 		k, err := c.getMachinePrivKey()
 		if err != nil {
 			return nil, err
 		}
-
-		nc, err = newNoiseClient(k, serverNoiseKey, c.serverURL)
+		nc, err := newNoiseClient(k, serverNoiseKey, c.serverURL, c.dialer)
 		if err != nil {
 			return nil, err
 		}
@@ -1268,7 +1297,7 @@ func (c *Direct) getNoiseClient() (*noiseClient, error) {
 	if err != nil {
 		return nil, err
 	}
-	return np.(*noiseClient), nil
+	return nc, nil
 }
 
 // setDNSNoise sends the SetDNSRequest request to the control plane server over Noise,
@@ -1376,35 +1405,35 @@ func (c *Direct) DoNoiseRequest(req *http.Request) (*http.Response, error) {
 	return nc.Do(req)
 }
 
-// tsmpPing sends a Ping to pr.IP, and sends an http request back to pr.URL
-// with ping response data.
-func tsmpPing(logf logger.Logf, c *http.Client, pr *tailcfg.PingRequest, pinger Pinger) error {
-	var err error
-	if pr.URL == "" {
-		return errors.New("invalid PingRequest with no URL")
-	}
-	if pr.IP.IsZero() {
-		return errors.New("PingRequest without IP")
-	}
-	if !strings.Contains(pr.Types, "TSMP") {
-		return fmt.Errorf("PingRequest with no TSMP in Types, got %q", pr.Types)
+// doPingerPing sends a Ping to pr.IP using pinger, and sends an http request back to
+// pr.URL with ping response data.
+func doPingerPing(logf logger.Logf, c *http.Client, pr *tailcfg.PingRequest, pinger Pinger, pingType tailcfg.PingType) {
+	if pr.URL == "" || pr.IP.IsZero() || pinger == nil {
+		logf("invalid ping request: missing url, ip or pinger")
+		return
 	}
+	start := time.Now()
 
-	now := time.Now()
-	pinger.Ping(pr.IP, true, func(res *ipnstate.PingResult) {
-		// Currently does not check for error since we just return if it fails.
-		err = postPingResult(now, logf, c, pr, res)
-	})
-	return err
+	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
+	defer cancel()
+
+	res, err := pinger.Ping(ctx, pr.IP, pingType)
+	if err != nil {
+		d := time.Since(start).Round(time.Millisecond)
+		logf("doPingerPing: ping error of type %q to %v after %v: %v", pingType, pr.IP, d, err)
+		return
+	}
+	postPingResult(start, logf, c, pr, res.ToPingResponse(pingType))
 }
 
-func postPingResult(now time.Time, logf logger.Logf, c *http.Client, pr *tailcfg.PingRequest, res *ipnstate.PingResult) error {
-	if res.Err != "" {
-		return errors.New(res.Err)
-	}
-	duration := time.Since(now)
+func postPingResult(start time.Time, logf logger.Logf, c *http.Client, pr *tailcfg.PingRequest, res *tailcfg.PingResponse) error {
+	duration := time.Since(start)
 	if pr.Log {
-		logf("TSMP ping to %v completed in %v seconds. pinger.Ping took %v seconds", pr.IP, res.LatencySeconds, duration.Seconds())
+		if res.Err == "" {
+			logf("ping to %v completed in %v. pinger.Ping took %v seconds", pr.IP, res.LatencySeconds, duration)
+		} else {
+			logf("ping to %v failed after %v: %v", pr.IP, duration, res.Err)
+		}
 	}
 	ctx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
 	defer cancel()
@@ -1414,20 +1443,20 @@ func postPingResult(now time.Time, logf logger.Logf, c *http.Client, pr *tailcfg
 		return err
 	}
 	// Send the results of the Ping, back to control URL.
-	req, err := http.NewRequestWithContext(ctx, "POST", pr.URL, bytes.NewBuffer(jsonPingRes))
+	req, err := http.NewRequestWithContext(ctx, "POST", pr.URL, bytes.NewReader(jsonPingRes))
 	if err != nil {
 		return fmt.Errorf("http.NewRequestWithContext(%q): %w", pr.URL, err)
 	}
 	if pr.Log {
-		logf("tsmpPing: sending ping results to %v ...", pr.URL)
+		logf("postPingResult: sending ping results to %v ...", pr.URL)
 	}
 	t0 := time.Now()
 	_, err = c.Do(req)
 	d := time.Since(t0).Round(time.Millisecond)
 	if err != nil {
-		return fmt.Errorf("tsmpPing error: %w to %v (after %v)", err, pr.URL, d)
+		return fmt.Errorf("postPingResult error: %w to %v (after %v)", err, pr.URL, d)
 	} else if pr.Log {
-		logf("tsmpPing complete to %v (after %v)", pr.URL, d)
+		logf("postPingResult complete to %v (after %v)", pr.URL, d)
 	}
 	return nil
 }

control/controlclient/direct_test.go

@@ -14,6 +14,7 @@ import (
 	"inet.af/netaddr"
 	"tailscale.com/hostinfo"
 	"tailscale.com/ipn/ipnstate"
+	"tailscale.com/net/tsdial"
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/key"
 )
@@ -30,6 +31,7 @@ func TestNewDirect(t *testing.T) {
 		GetMachinePrivateKey: func() (key.MachinePrivate, error) {
 			return k, nil
 		},
+		Dialer: new(tsdial.Dialer),
 	}
 	c, err := NewDirect(opts)
 	if err != nil {
@@ -66,22 +68,18 @@ func TestNewDirect(t *testing.T) {
 	}
 
 	endpoints := fakeEndpoints(1, 2, 3)
-	changed = c.newEndpoints(12, endpoints)
+	changed = c.newEndpoints(endpoints)
 	if !changed {
-		t.Errorf("c.newEndpoints(12) want true got %v", changed)
+		t.Errorf("c.newEndpoints want true got %v", changed)
 	}
-	changed = c.newEndpoints(12, endpoints)
+	changed = c.newEndpoints(endpoints)
 	if changed {
-		t.Errorf("c.newEndpoints(12) want false got %v", changed)
-	}
-	changed = c.newEndpoints(13, endpoints)
-	if !changed {
-		t.Errorf("c.newEndpoints(13) want true got %v", changed)
+		t.Errorf("c.newEndpoints want false got %v", changed)
 	}
 	endpoints = fakeEndpoints(4, 5, 6)
-	changed = c.newEndpoints(13, endpoints)
+	changed = c.newEndpoints(endpoints)
 	if !changed {
-		t.Errorf("c.newEndpoints(13) want true got %v", changed)
+		t.Errorf("c.newEndpoints want true got %v", changed)
 	}
 }
 
@@ -106,6 +104,7 @@ func TestTsmpPing(t *testing.T) {
 		GetMachinePrivateKey: func() (key.MachinePrivate, error) {
 			return k, nil
 		},
+		Dialer: new(tsdial.Dialer),
 	}
 
 	c, err := NewDirect(opts)
@@ -113,7 +112,8 @@ func TestTsmpPing(t *testing.T) {
 		t.Fatal(err)
 	}
 
-	pingRes := &ipnstate.PingResult{
+	pingRes := &tailcfg.PingResponse{
+		Type:     "TSMP",
 		IP:       "123.456.7890",
 		Err:      "",
 		NodeName: "testnode",

control/controlclient/noise.go

@@ -18,8 +18,10 @@ import (
 	"golang.org/x/net/http2"
 	"tailscale.com/control/controlbase"
 	"tailscale.com/control/controlhttp"
+	"tailscale.com/net/tsdial"
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/key"
+	"tailscale.com/util/mak"
 	"tailscale.com/util/multierr"
 )
 
@@ -45,6 +47,7 @@ func (c *noiseConn) Close() error {
 // the ts2021 protocol.
 type noiseClient struct {
 	*http.Client // HTTP client used to talk to tailcontrol
+	dialer       *tsdial.Dialer
 	privKey      key.MachinePrivate
 	serverPubKey key.MachinePublic
 	serverHost   string // the host:port part of serverURL
@@ -57,7 +60,7 @@ type noiseClient struct {
 
 // newNoiseClient returns a new noiseClient for the provided server and machine key.
 // serverURL is of the form https://<host>:<port> (no trailing slash).
-func newNoiseClient(priKey key.MachinePrivate, serverPubKey key.MachinePublic, serverURL string) (*noiseClient, error) {
+func newNoiseClient(priKey key.MachinePrivate, serverPubKey key.MachinePublic, serverURL string, dialer *tsdial.Dialer) (*noiseClient, error) {
 	u, err := url.Parse(serverURL)
 	if err != nil {
 		return nil, err
@@ -74,6 +77,7 @@ func newNoiseClient(priKey key.MachinePrivate, serverPubKey key.MachinePublic, s
 		serverPubKey: serverPubKey,
 		privKey:      priKey,
 		serverHost:   host,
+		dialer:       dialer,
 	}
 
 	// Create the HTTP/2 Transport using a net/http.Transport
@@ -137,9 +141,6 @@ func (nc *noiseClient) Close() error {
 func (nc *noiseClient) dial(_, _ string, _ *tls.Config) (net.Conn, error) {
 	nc.mu.Lock()
 	connID := nc.nextID
-	if nc.connPool == nil {
-		nc.connPool = make(map[int]*noiseConn)
-	}
 	nc.nextID++
 	nc.mu.Unlock()
 
@@ -153,7 +154,7 @@ func (nc *noiseClient) dial(_, _ string, _ *tls.Config) (net.Conn, error) {
 		// thousand version numbers before getting to this point.
 		panic("capability version is too high to fit in the wire protocol")
 	}
-	conn, err := controlhttp.Dial(ctx, nc.serverHost, nc.privKey, nc.serverPubKey, uint16(tailcfg.CurrentCapabilityVersion))
+	conn, err := controlhttp.Dial(ctx, nc.serverHost, nc.privKey, nc.serverPubKey, uint16(tailcfg.CurrentCapabilityVersion), nc.dialer.SystemDial)
 	if err != nil {
 		return nil, err
 	}
@@ -161,6 +162,6 @@ func (nc *noiseClient) dial(_, _ string, _ *tls.Config) (net.Conn, error) {
 	nc.mu.Lock()
 	defer nc.mu.Unlock()
 	ncc := &noiseConn{Conn: conn, id: connID, pool: nc}
-	nc.connPool[ncc.id] = ncc
+	mak.Set(&nc.connPool, ncc.id, ncc)
 	return ncc, nil
 }

control/controlclient/status.go

@@ -9,7 +9,6 @@ import (
 	"fmt"
 	"reflect"
 
-	"tailscale.com/tailcfg"
 	"tailscale.com/types/empty"
 	"tailscale.com/types/netmap"
 	"tailscale.com/types/persist"
@@ -75,9 +74,8 @@ type Status struct {
 	// package, but we have some automated tests elsewhere that need to
 	// use them. Please don't use these fields.
 	// TODO(apenwarr): Unexport or remove these.
-	State    State
-	Persist  *persist.Persist  // locally persisted configuration
-	Hostinfo *tailcfg.Hostinfo // current Hostinfo data
+	State   State
+	Persist *persist.Persist // locally persisted configuration
 }
 
 // Equal reports whether s and s2 are equal.
@@ -92,7 +90,6 @@ func (s *Status) Equal(s2 *Status) bool {
 		s.URL == s2.URL &&
 		reflect.DeepEqual(s.Persist, s2.Persist) &&
 		reflect.DeepEqual(s.NetMap, s2.NetMap) &&
-		reflect.DeepEqual(s.Hostinfo, s2.Hostinfo) &&
 		s.State == s2.State
 }
 

control/controlhttp/client.go

@@ -2,6 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build !js
+// +build !js
+
 // Package controlhttp implements the Tailscale 2021 control protocol
 // base transport over HTTP.
 //
@@ -25,37 +28,21 @@ import (
 	"errors"
 	"fmt"
 	"io"
-	"log"
 	"net"
 	"net/http"
 	"net/http/httptrace"
 	"net/url"
+	"time"
 
 	"tailscale.com/control/controlbase"
 	"tailscale.com/net/dnscache"
 	"tailscale.com/net/dnsfallback"
-	"tailscale.com/net/netns"
 	"tailscale.com/net/netutil"
 	"tailscale.com/net/tlsdial"
 	"tailscale.com/net/tshttpproxy"
 	"tailscale.com/types/key"
 )
 
-const (
-	// upgradeHeader is the value of the Upgrade HTTP header used to
-	// indicate the Tailscale control protocol.
-	upgradeHeaderValue = "tailscale-control-protocol"
-
-	// handshakeHeaderName is the HTTP request header that can
-	// optionally contain base64-encoded initial handshake
-	// payload, to save an RTT.
-	handshakeHeaderName = "X-Tailscale-Handshake"
-
-	// serverUpgradePath is where the server-side HTTP handler to
-	// to do the protocol switch is located.
-	serverUpgradePath = "/ts2021"
-)
-
 // Dial connects to the HTTP server at addr, requests to switch to the
 // Tailscale control protocol, and returns an established control
 // protocol connection.
@@ -65,13 +52,12 @@ const (
 //
 // The provided ctx is only used for the initial connection, until
 // Dial returns. It does not affect the connection once established.
-func Dial(ctx context.Context, addr string, machineKey key.MachinePrivate, controlKey key.MachinePublic, protocolVersion uint16) (*controlbase.Conn, error) {
+func Dial(ctx context.Context, addr string, machineKey key.MachinePrivate, controlKey key.MachinePublic, protocolVersion uint16, dialer dnscache.DialContextFunc) (*controlbase.Conn, error) {
 	host, port, err := net.SplitHostPort(addr)
 	if err != nil {
 		return nil, err
 	}
 	a := &dialParams{
-		ctx:        ctx,
 		host:       host,
 		httpPort:   port,
 		httpsPort:  "443",
@@ -79,12 +65,12 @@ func Dial(ctx context.Context, addr string, machineKey key.MachinePrivate, contr
 		controlKey: controlKey,
 		version:    protocolVersion,
 		proxyFunc:  tshttpproxy.ProxyFromEnvironment,
+		dialer:     dialer,
 	}
-	return a.dial()
+	return a.dial(ctx)
 }
 
 type dialParams struct {
-	ctx        context.Context
 	host       string
 	httpPort   string
 	httpsPort  string
@@ -92,65 +78,132 @@ type dialParams struct {
 	controlKey key.MachinePublic
 	version    uint16
 	proxyFunc  func(*http.Request) (*url.URL, error) // or nil
+	dialer     dnscache.DialContextFunc
 
 	// For tests only
-	insecureTLS bool
+	insecureTLS       bool
+	testFallbackDelay time.Duration
 }
 
-func (a *dialParams) dial() (*controlbase.Conn, error) {
-	init, cont, err := controlbase.ClientDeferred(a.machineKey, a.controlKey, a.version)
-	if err != nil {
-		return nil, err
+// httpsFallbackDelay is how long we'll wait for a.httpPort to work before
+// starting to try a.httpsPort.
+func (a *dialParams) httpsFallbackDelay() time.Duration {
+	if v := a.testFallbackDelay; v != 0 {
+		return v
 	}
+	return 500 * time.Millisecond
+}
 
-	u := &url.URL{
+func (a *dialParams) dial(ctx context.Context) (*controlbase.Conn, error) {
+	// Create one shared context used by both port 80 and port 443 dials.
+	// If port 80 is still in flight when 443 returns, this deferred cancel
+	// will stop the port 80 dial.
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+
+	// u80 and u443 are the URLs we'll try to hit over HTTP or HTTPS,
+	// respectively, in order to do the HTTP upgrade to a net.Conn over which
+	// we'll speak Noise.
+	u80 := &url.URL{
 		Scheme: "http",
 		Host:   net.JoinHostPort(a.host, a.httpPort),
 		Path:   serverUpgradePath,
 	}
-	conn, httpErr := a.tryURL(u, init)
-	if httpErr == nil {
-		ret, err := cont(a.ctx, conn)
-		if err != nil {
-			conn.Close()
-			return nil, err
-		}
-		return ret, nil
+	u443 := &url.URL{
+		Scheme: "https",
+		Host:   net.JoinHostPort(a.host, a.httpsPort),
+		Path:   serverUpgradePath,
 	}
 
-	// Connecting over plain HTTP failed, assume it's an HTTP proxy
-	// being difficult and see if we can get through over HTTPS.
-	u.Scheme = "https"
-	u.Host = net.JoinHostPort(a.host, a.httpsPort)
-	init, cont, err = controlbase.ClientDeferred(a.machineKey, a.controlKey, a.version)
+	type tryURLRes struct {
+		u    *url.URL          // input (the URL conn+err are for/from)
+		conn *controlbase.Conn // result (mutually exclusive with err)
+		err  error
+	}
+	ch := make(chan tryURLRes) // must be unbuffered
+	try := func(u *url.URL) {
+		cbConn, err := a.dialURL(ctx, u)
+		select {
+		case ch <- tryURLRes{u, cbConn, err}:
+		case <-ctx.Done():
+			if cbConn != nil {
+				cbConn.Close()
+			}
+		}
+	}
+
+	// Start the plaintext HTTP attempt first.
+	go try(u80)
+
+	// In case outbound port 80 blocked or MITM'ed poorly, start a backup timer
+	// to dial port 443 if port 80 doesn't either succeed or fail quickly.
+	try443Timer := time.AfterFunc(a.httpsFallbackDelay(), func() { try(u443) })
+	defer try443Timer.Stop()
+
+	var err80, err443 error
+	for {
+		select {
+		case <-ctx.Done():
+			return nil, fmt.Errorf("connection attempts aborted by context: %w", ctx.Err())
+		case res := <-ch:
+			if res.err == nil {
+				return res.conn, nil
+			}
+			switch res.u {
+			case u80:
+				// Connecting over plain HTTP failed; assume it's an HTTP proxy
+				// being difficult and see if we can get through over HTTPS.
+				err80 = res.err
+				// Stop the fallback timer and run it immediately. We don't use
+				// Timer.Reset(0) here because on AfterFuncs, that can run it
+				// again.
+				if try443Timer.Stop() {
+					go try(u443)
+				} // else we lost the race and it started already which is what we want
+			case u443:
+				err443 = res.err
+			default:
+				panic("invalid")
+			}
+			if err80 != nil && err443 != nil {
+				return nil, fmt.Errorf("all connection attempts failed (HTTP: %v, HTTPS: %v)", err80, err443)
+			}
+		}
+	}
+}
+
+// dialURL attempts to connect to the given URL.
+func (a *dialParams) dialURL(ctx context.Context, u *url.URL) (*controlbase.Conn, error) {
+	init, cont, err := controlbase.ClientDeferred(a.machineKey, a.controlKey, a.version)
 	if err != nil {
 		return nil, err
 	}
-	conn, tlsErr := a.tryURL(u, init)
-	if tlsErr == nil {
-		ret, err := cont(a.ctx, conn)
-		if err != nil {
-			conn.Close()
-			return nil, err
-		}
-		return ret, nil
+	netConn, err := a.tryURLUpgrade(ctx, u, init)
+	if err != nil {
+		return nil, err
 	}
-
-	return nil, fmt.Errorf("all connection attempts failed (HTTP: %v, HTTPS: %v)", httpErr, tlsErr)
+	cbConn, err := cont(ctx, netConn)
+	if err != nil {
+		netConn.Close()
+		return nil, err
+	}
+	return cbConn, nil
 }
 
-func (a *dialParams) tryURL(u *url.URL, init []byte) (net.Conn, error) {
+// tryURLUpgrade connects to u, and tries to upgrade it to a net.Conn.
+//
+// Only the provided ctx is used, not a.ctx.
+func (a *dialParams) tryURLUpgrade(ctx context.Context, u *url.URL, init []byte) (net.Conn, error) {
 	dns := &dnscache.Resolver{
 		Forward:          dnscache.Get().Forward,
 		LookupIPFallback: dnsfallback.Lookup,
 		UseLastGood:      true,
 	}
-	dialer := netns.NewDialer(log.Printf)
 	tr := http.DefaultTransport.(*http.Transport).Clone()
 	defer tr.CloseIdleConnections()
 	tr.Proxy = a.proxyFunc
 	tshttpproxy.SetTransportGetProxyConnectHeader(tr)
-	tr.DialContext = dnscache.Dialer(dialer.DialContext, dns)
+	tr.DialContext = dnscache.Dialer(a.dialer, dns)
 	// Disable HTTP2, since h2 can't do protocol switching.
 	tr.TLSClientConfig.NextProtos = []string{}
 	tr.TLSNextProto = map[string]func(string, *tls.Conn) http.RoundTripper{}
@@ -159,7 +212,7 @@ func (a *dialParams) tryURL(u *url.URL, init []byte) (net.Conn, error) {
 		tr.TLSClientConfig.InsecureSkipVerify = true
 		tr.TLSClientConfig.VerifyConnection = nil
 	}
-	tr.DialTLSContext = dnscache.TLSDialer(dialer.DialContext, dns, tr.TLSClientConfig)
+	tr.DialTLSContext = dnscache.TLSDialer(a.dialer, dns, tr.TLSClientConfig)
 	tr.DisableCompression = true
 
 	// (mis)use httptrace to extract the underlying net.Conn from the
@@ -189,7 +242,7 @@ func (a *dialParams) tryURL(u *url.URL, init []byte) (net.Conn, error) {
 			connCh <- info.Conn
 		},
 	}
-	ctx := httptrace.WithClientTrace(a.ctx, &trace)
+	ctx = httptrace.WithClientTrace(ctx, &trace)
 	req := &http.Request{
 		Method: "POST",
 		URL:    u,

control/controlhttp/client_js.go

@@ -0,0 +1,61 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package controlhttp
+
+import (
+	"context"
+	"encoding/base64"
+	"net"
+	"net/url"
+
+	"nhooyr.io/websocket"
+	"tailscale.com/control/controlbase"
+	"tailscale.com/net/dnscache"
+	"tailscale.com/types/key"
+)
+
+// Variant of Dial that tunnels the request over WebSockets, since we cannot do
+// bi-directional communication over an HTTP connection when in JS.
+func Dial(ctx context.Context, addr string, machineKey key.MachinePrivate, controlKey key.MachinePublic, protocolVersion uint16, dialer dnscache.DialContextFunc) (*controlbase.Conn, error) {
+	init, cont, err := controlbase.ClientDeferred(machineKey, controlKey, protocolVersion)
+	if err != nil {
+		return nil, err
+	}
+
+	host, _, err := net.SplitHostPort(addr)
+	if err != nil {
+		return nil, err
+	}
+	wsScheme := "wss"
+	wsHost := host
+	if host == "localhost" {
+		wsScheme = "ws"
+		wsHost = addr
+	}
+	wsURL := &url.URL{
+		Scheme: wsScheme,
+		Host:   wsHost,
+		Path:   serverUpgradePath,
+		// Can't set HTTP headers on the websocket request, so we have to to send
+		// the handshake via an HTTP header.
+		RawQuery: url.Values{
+			handshakeHeaderName: []string{base64.StdEncoding.EncodeToString(init)},
+		}.Encode(),
+	}
+	wsConn, _, err := websocket.Dial(ctx, wsURL.String(), &websocket.DialOptions{
+		Subprotocols: []string{upgradeHeaderValue},
+	})
+	if err != nil {
+		return nil, err
+	}
+	netConn := websocket.NetConn(context.Background(), wsConn, websocket.MessageBinary)
+	cbConn, err := cont(ctx, netConn)
+	if err != nil {
+		netConn.Close()
+		return nil, err
+	}
+	return cbConn, nil
+
+}

control/controlhttp/constants.go

@@ -0,0 +1,20 @@
+// Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package controlhttp
+
+const (
+	// upgradeHeader is the value of the Upgrade HTTP header used to
+	// indicate the Tailscale control protocol.
+	upgradeHeaderValue = "tailscale-control-protocol"
+
+	// handshakeHeaderName is the HTTP request header that can
+	// optionally contain base64-encoded initial handshake
+	// payload, to save an RTT.
+	handshakeHeaderName = "X-Tailscale-Handshake"
+
+	// serverUpgradePath is where the server-side HTTP handler to
+	// to do the protocol switch is located.
+	serverUpgradePath = "/ts2021"
+)

control/controlhttp/http_test.go

@@ -17,22 +17,36 @@ import (
 	"strconv"
 	"sync"
 	"testing"
+	"time"
 
 	"tailscale.com/control/controlbase"
 	"tailscale.com/net/socks5"
+	"tailscale.com/net/tsdial"
 	"tailscale.com/types/key"
 )
 
+type httpTestParam struct {
+	name  string
+	proxy proxy
+
+	// makeHTTPHangAfterUpgrade makes the HTTP response hang after sending a
+	// 101 switching protocols.
+	makeHTTPHangAfterUpgrade bool
+}
+
 func TestControlHTTP(t *testing.T) {
-	tests := []struct {
-		name  string
-		proxy proxy
-	}{
+	tests := []httpTestParam{
 		// direct connection
 		{
 			name:  "no_proxy",
 			proxy: nil,
 		},
+		// direct connection but port 80 is MITM'ed and broken
+		{
+			name:                     "port80_broken_mitm",
+			proxy:                    nil,
+			makeHTTPHangAfterUpgrade: true,
+		},
 		// SOCKS5
 		{
 			name:  "socks5",
@@ -96,12 +110,13 @@ func TestControlHTTP(t *testing.T) {
 
 	for _, test := range tests {
 		t.Run(test.name, func(t *testing.T) {
-			testControlHTTP(t, test.proxy)
+			testControlHTTP(t, test)
 		})
 	}
 }
 
-func testControlHTTP(t *testing.T, proxy proxy) {
+func testControlHTTP(t *testing.T, param httpTestParam) {
+	proxy := param.proxy
 	client, server := key.NewMachine(), key.NewMachine()
 
 	const testProtocolVersion = 1
@@ -132,7 +147,11 @@ func testControlHTTP(t *testing.T, proxy proxy) {
 		t.Fatalf("HTTPS listen: %v", err)
 	}
 
-	httpServer := &http.Server{Handler: handler}
+	var httpHandler http.Handler = handler
+	if param.makeHTTPHangAfterUpgrade {
+		httpHandler = http.HandlerFunc(brokenMITMHandler)
+	}
+	httpServer := &http.Server{Handler: httpHandler}
 	go httpServer.Serve(httpLn)
 	defer httpServer.Close()
 
@@ -143,18 +162,24 @@ func testControlHTTP(t *testing.T, proxy proxy) {
 	go httpsServer.ServeTLS(httpsLn, "", "")
 	defer httpsServer.Close()
 
-	//ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
-	//defer cancel()
+	ctx := context.Background()
+	const debugTimeout = false
+	if debugTimeout {
+		var cancel context.CancelFunc
+		ctx, cancel = context.WithTimeout(context.Background(), 5*time.Second)
+		defer cancel()
+	}
 
 	a := dialParams{
-		ctx:         context.Background(), //ctx,
-		host:        "localhost",
-		httpPort:    strconv.Itoa(httpLn.Addr().(*net.TCPAddr).Port),
-		httpsPort:   strconv.Itoa(httpsLn.Addr().(*net.TCPAddr).Port),
-		machineKey:  client,
-		controlKey:  server.Public(),
-		version:     testProtocolVersion,
-		insecureTLS: true,
+		host:              "localhost",
+		httpPort:          strconv.Itoa(httpLn.Addr().(*net.TCPAddr).Port),
+		httpsPort:         strconv.Itoa(httpsLn.Addr().(*net.TCPAddr).Port),
+		machineKey:        client,
+		controlKey:        server.Public(),
+		version:           testProtocolVersion,
+		insecureTLS:       true,
+		dialer:            new(tsdial.Dialer).SystemDial,
+		testFallbackDelay: 50 * time.Millisecond,
 	}
 
 	if proxy != nil {
@@ -173,7 +198,7 @@ func testControlHTTP(t *testing.T, proxy proxy) {
 		}
 	}
 
-	conn, err := a.dial()
+	conn, err := a.dial(ctx)
 	if err != nil {
 		t.Fatalf("dialing controlhttp: %v", err)
 	}
@@ -215,6 +240,7 @@ type proxy interface {
 
 type socksProxy struct {
 	sync.Mutex
+	closed          bool
 	proxy           socks5.Server
 	ln              net.Listener
 	clientConnAddrs map[string]bool // addrs of the local end of outgoing conns from proxy
@@ -230,7 +256,14 @@ func (s *socksProxy) Start(t *testing.T) (url string) {
 	}
 	s.ln = ln
 	s.clientConnAddrs = map[string]bool{}
-	s.proxy.Logf = t.Logf
+	s.proxy.Logf = func(format string, a ...any) {
+		s.Lock()
+		defer s.Unlock()
+		if s.closed {
+			return
+		}
+		t.Logf(format, a...)
+	}
 	s.proxy.Dialer = s.dialAndRecord
 	go s.proxy.Serve(ln)
 	return fmt.Sprintf("socks5://%s", ln.Addr().String())
@@ -239,6 +272,10 @@ func (s *socksProxy) Start(t *testing.T) (url string) {
 func (s *socksProxy) Close() {
 	s.Lock()
 	defer s.Unlock()
+	if s.closed {
+		return
+	}
+	s.closed = true
 	s.ln.Close()
 }
 
@@ -398,3 +435,11 @@ EKTcWGekdmdDPsHloRNtsiCa697B2O9IFA==
 		Certificates: []tls.Certificate{cert},
 	}
 }
+
+func brokenMITMHandler(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Upgrade", upgradeHeaderValue)
+	w.Header().Set("Connection", "upgrade")
+	w.WriteHeader(http.StatusSwitchingProtocols)
+	w.(http.Flusher).Flush()
+	<-r.Context().Done()
+}

control/controlhttp/server.go

@@ -11,6 +11,7 @@ import (
 	"fmt"
 	"net/http"
 
+	"nhooyr.io/websocket"
 	"tailscale.com/control/controlbase"
 	"tailscale.com/net/netutil"
 	"tailscale.com/types/key"
@@ -27,6 +28,9 @@ func AcceptHTTP(ctx context.Context, w http.ResponseWriter, r *http.Request, pri
 		http.Error(w, "missing next protocol", http.StatusBadRequest)
 		return nil, errors.New("no next protocol in HTTP request")
 	}
+	if next == "websocket" {
+		return acceptWebsocket(ctx, w, r, private)
+	}
 	if next != upgradeHeaderValue {
 		http.Error(w, "unknown next protocol", http.StatusBadRequest)
 		return nil, fmt.Errorf("client requested unhandled next protocol %q", next)
@@ -71,3 +75,42 @@ func AcceptHTTP(ctx context.Context, w http.ResponseWriter, r *http.Request, pri
 
 	return nc, nil
 }
+
+// acceptWebsocket upgrades a WebSocket connection (from a client that cannot
+// speak HTTP) to a Tailscale control protocol base transport connection.
+func acceptWebsocket(ctx context.Context, w http.ResponseWriter, r *http.Request, private key.MachinePrivate) (*controlbase.Conn, error) {
+	c, err := websocket.Accept(w, r, &websocket.AcceptOptions{
+		Subprotocols:   []string{upgradeHeaderValue},
+		OriginPatterns: []string{"*"},
+	})
+	if err != nil {
+		return nil, fmt.Errorf("Could not accept WebSocket connection %v", err)
+	}
+	if c.Subprotocol() != upgradeHeaderValue {
+		c.Close(websocket.StatusPolicyViolation, "client must speak the control subprotocol")
+		return nil, fmt.Errorf("Unexpected subprotocol %q", c.Subprotocol())
+	}
+	if err := r.ParseForm(); err != nil {
+		c.Close(websocket.StatusPolicyViolation, "Could not parse parameters")
+		return nil, fmt.Errorf("parse query parameters: %v", err)
+	}
+	initB64 := r.Form.Get(handshakeHeaderName)
+	if initB64 == "" {
+		c.Close(websocket.StatusPolicyViolation, "missing Tailscale handshake parameter")
+		return nil, errors.New("no tailscale handshake parameter in HTTP request")
+	}
+	init, err := base64.StdEncoding.DecodeString(initB64)
+	if err != nil {
+		c.Close(websocket.StatusPolicyViolation, "invalid tailscale handshake parameter")
+		return nil, fmt.Errorf("decoding base64 handshake parameter: %v", err)
+	}
+
+	conn := websocket.NetConn(ctx, c, websocket.MessageBinary)
+	nc, err := controlbase.Server(ctx, conn, private, init)
+	if err != nil {
+		conn.Close()
+		return nil, fmt.Errorf("noise handshake failed: %w", err)
+	}
+
+	return nc, nil
+}

derp/derp_client.go

@@ -485,7 +485,7 @@ func (c *Client) recvTimeout(timeout time.Duration) (m ReceivedMessage, err erro
 			c.peeked = int(n)
 		} else {
 			// But if for some reason we read a large DERP message (which isn't necessarily
-			// a Wireguard packet), then just allocate memory for it.
+			// a WireGuard packet), then just allocate memory for it.
 			// TODO(bradfitz): use a pool if large frames ever happen in practice.
 			b = make([]byte, n)
 			_, err = io.ReadFull(c.br, b)

derp/derphttp/derphttp_client.go

@@ -538,12 +538,17 @@ func (c *Client) tlsClient(nc net.Conn, node *tailcfg.DERPNode) *tls.Conn {
 	return tls.Client(nc, tlsConf)
 }
 
-func (c *Client) DialRegionTLS(ctx context.Context, reg *tailcfg.DERPRegion) (tlsConn *tls.Conn, connClose io.Closer, err error) {
+// DialRegionTLS returns a TLS connection to a DERP node in the given region.
+//
+// DERP nodes for a region are tried in sequence according to their order
+// in the DERP map. TLS is initiated on the first node where a socket is
+// established.
+func (c *Client) DialRegionTLS(ctx context.Context, reg *tailcfg.DERPRegion) (tlsConn *tls.Conn, connClose io.Closer, node *tailcfg.DERPNode, err error) {
 	tcpConn, node, err := c.dialRegion(ctx, reg)
 	if err != nil {
-		return nil, nil, err
+		return nil, nil, nil, err
 	}
-	done := make(chan bool) // unbufferd
+	done := make(chan bool) // unbuffered
 	defer close(done)
 
 	tlsConn = c.tlsClient(tcpConn, node)
@@ -556,13 +561,13 @@ func (c *Client) DialRegionTLS(ctx context.Context, reg *tailcfg.DERPRegion) (tl
 	}()
 	err = tlsConn.Handshake()
 	if err != nil {
-		return nil, nil, err
+		return nil, nil, nil, err
 	}
 	select {
 	case done <- true:
-		return tlsConn, tcpConn, nil
+		return tlsConn, tcpConn, node, nil
 	case <-ctx.Done():
-		return nil, nil, ctx.Err()
+		return nil, nil, nil, ctx.Err()
 	}
 }
 

derp/derphttp/websocket.go

@@ -13,7 +13,6 @@ import (
 	"net"
 
 	"nhooyr.io/websocket"
-	"tailscale.com/derp/wsconn"
 )
 
 func init() {
@@ -29,5 +28,6 @@ func dialWebsocket(ctx context.Context, urlStr string) (net.Conn, error) {
 		return nil, err
 	}
 	log.Printf("websocket: connected to %v", urlStr)
-	return wsconn.New(c), nil
+	netConn := websocket.NetConn(context.Background(), c, websocket.MessageBinary)
+	return netConn, nil
 }

derp/wsconn/wsconn.go

@@ -1,104 +0,0 @@
-// Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// Package wsconn contains an adapter type that turns
-// a websocket connection into a net.Conn.
-package wsconn
-
-import (
-	"context"
-	"net"
-	"sync"
-	"time"
-
-	"nhooyr.io/websocket"
-)
-
-// New returns a net.Conn wrapper around c,
-// using c to send and receive binary messages with
-// chunks of bytes with no defined framing, effectively
-// discarding all WebSocket-level message framing.
-func New(c *websocket.Conn) net.Conn {
-	return &websocketConn{c: c}
-}
-
-// websocketConn implements derp.Conn around a *websocket.Conn,
-// treating a websocket.Conn as a byte stream, ignoring the WebSocket
-// frame/message boundaries.
-type websocketConn struct {
-	c *websocket.Conn
-
-	// rextra are extra bytes owned by the reader.
-	rextra []byte
-
-	mu         sync.Mutex
-	rdeadline  time.Time
-	cancelRead context.CancelFunc
-}
-
-func (wc *websocketConn) LocalAddr() net.Addr  { return addr{} }
-func (wc *websocketConn) RemoteAddr() net.Addr { return addr{} }
-
-type addr struct{}
-
-func (addr) Network() string { return "websocket" }
-func (addr) String() string  { return "websocket" }
-
-func (wc *websocketConn) Read(p []byte) (n int, err error) {
-	// Drain any leftover from previously.
-	n = copy(p, wc.rextra)
-	if n > 0 {
-		wc.rextra = wc.rextra[n:]
-		return n, nil
-	}
-
-	var ctx context.Context
-	var cancel context.CancelFunc
-
-	wc.mu.Lock()
-	if dl := wc.rdeadline; !dl.IsZero() {
-		ctx, cancel = context.WithDeadline(context.Background(), wc.rdeadline)
-	} else {
-		ctx, cancel = context.WithDeadline(context.Background(), time.Now().Add(30*24*time.Hour))
-		wc.rdeadline = time.Time{}
-	}
-	wc.cancelRead = cancel
-	wc.mu.Unlock()
-	defer cancel()
-
-	_, buf, err := wc.c.Read(ctx)
-	n = copy(p, buf)
-	wc.rextra = buf[n:]
-	return n, err
-}
-
-func (wc *websocketConn) Write(p []byte) (n int, err error) {
-	err = wc.c.Write(context.Background(), websocket.MessageBinary, p)
-	if err != nil {
-		return 0, err
-	}
-	return len(p), nil
-}
-
-func (wc *websocketConn) Close() error { return wc.c.Close(websocket.StatusNormalClosure, "close") }
-
-func (wc *websocketConn) SetDeadline(t time.Time) error {
-	wc.SetReadDeadline(t)
-	wc.SetWriteDeadline(t)
-	return nil
-}
-
-func (wc *websocketConn) SetReadDeadline(t time.Time) error {
-	wc.mu.Lock()
-	defer wc.mu.Unlock()
-	if !t.IsZero() && (wc.rdeadline.IsZero() || t.Before(wc.rdeadline)) && wc.cancelRead != nil {
-		wc.cancelRead()
-	}
-	wc.rdeadline = t
-	return nil
-}
-
-func (wc *websocketConn) SetWriteDeadline(t time.Time) error {
-	return nil
-}

docs/k8s/Dockerfile

@@ -1,7 +0,0 @@
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
-# Use of this source code is governed by a BSD-style
-# license that can be found in the LICENSE file.
-
-FROM ghcr.io/tailscale/tailscale:latest
-COPY run.sh /run.sh
-CMD "/run.sh"

docs/k8s/Makefile

@@ -1,38 +1,28 @@
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
-ifndef IMAGE_TAG
-  $(error "IMAGE_TAG is not set")
-endif
-
-ROUTES ?= ""
+TS_ROUTES ?= ""
 SA_NAME ?= tailscale
-KUBE_SECRET ?= tailscale
-
-build:
-	@docker build . -t $(IMAGE_TAG)
-
-push: build
-	@docker push $(IMAGE_TAG)
+TS_KUBE_SECRET ?= tailscale
 
 rbac:
-	@sed -e "s;{{KUBE_SECRET}};$(KUBE_SECRET);g" role.yaml | kubectl apply -f -
+	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" role.yaml | kubectl apply -f -
 	@sed -e "s;{{SA_NAME}};$(SA_NAME);g" rolebinding.yaml | kubectl apply -f -
 	@sed -e "s;{{SA_NAME}};$(SA_NAME);g" sa.yaml | kubectl apply -f -
 
 sidecar:
 	@kubectl delete -f sidecar.yaml --ignore-not-found --grace-period=0
-	@sed -e "s;{{KUBE_SECRET}};$(KUBE_SECRET);g" sidecar.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | sed -e "s;{{IMAGE_TAG}};$(IMAGE_TAG);g" | kubectl create -f-
+	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" sidecar.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | kubectl create -f-
 
 userspace-sidecar:
 	@kubectl delete -f userspace-sidecar.yaml --ignore-not-found --grace-period=0
-	@sed -e "s;{{KUBE_SECRET}};$(KUBE_SECRET);g" userspace-sidecar.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | sed -e "s;{{IMAGE_TAG}};$(IMAGE_TAG);g" | kubectl create -f-
+	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" userspace-sidecar.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | kubectl create -f-
 
 proxy:
-	@kubectl delete -f proxy.yaml --ignore-not-found --grace-period=0
-	@sed -e "s;{{KUBE_SECRET}};$(KUBE_SECRET);g" proxy.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | sed -e "s;{{IMAGE_TAG}};$(IMAGE_TAG);g" | sed -e "s;{{DEST_IP}};$(DEST_IP);g" | kubectl create -f-
+	kubectl delete -f proxy.yaml --ignore-not-found --grace-period=0
+	sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" proxy.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | sed -e "s;{{TS_DEST_IP}};$(TS_DEST_IP);g" | kubectl create -f-
 
 subnet-router:
 	@kubectl delete -f subnet.yaml --ignore-not-found --grace-period=0
-	@sed -e "s;{{KUBE_SECRET}};$(KUBE_SECRET);g" subnet.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | sed -e "s;{{IMAGE_TAG}};$(IMAGE_TAG);g" | sed -e "s;{{ROUTES}};$(ROUTES);g" | kubectl create -f-
+	@sed -e "s;{{TS_KUBE_SECRET}};$(TS_KUBE_SECRET);g" subnet.yaml | sed -e "s;{{SA_NAME}};$(SA_NAME);g" | sed -e "s;{{TS_ROUTES}};$(TS_ROUTES);g" | kubectl create -f-

docs/k8s/README.md

@@ -15,19 +15,12 @@ There are quite a few ways of running Tailscale inside a Kubernetes Cluster, som
      AUTH_KEY: tskey-...
    ```
 
-1. Build and push the container
-
-   ```bash
-   export IMAGE_TAG=tailscale-k8s:latest
-   make push
-   ```
-
 1. Tailscale (v1.16+) supports storing state inside a Kubernetes Secret.
 
    Configure RBAC to allow the Tailscale pod to read/write the `tailscale` secret.
    ```bash
    export SA_NAME=tailscale
-   export KUBE_SECRET=tailscale-auth
+   export TS_KUBE_SECRET=tailscale-auth
    make rbac
    ```
 
@@ -82,11 +75,11 @@ Running a Tailscale proxy allows you to provide inbound connectivity to a Kubern
    ```bash
    kubectl create deployment nginx --image nginx
    kubectl expose deployment nginx --port 80
-   export DEST_IP="$(kubectl get svc nginx -o=jsonpath='{.spec.clusterIP}')"
+   export TS_DEST_IP="$(kubectl get svc nginx -o=jsonpath='{.spec.clusterIP}')"
    ```
    **Using an existing service**
    ```bash
-   export DEST_IP="$(kubectl get svc <SVC_NAME> -o=jsonpath='{.spec.clusterIP}')"
+   export TS_DEST_IP="$(kubectl get svc <SVC_NAME> -o=jsonpath='{.spec.clusterIP}')"
    ```
 
 1. Deploy the proxy pod
@@ -114,12 +107,12 @@ Running a Tailscale proxy allows you to provide inbound connectivity to a Kubern
 Running a Tailscale [subnet router](https://tailscale.com/kb/1019/subnets/) allows you to access
 the entire Kubernetes cluster network (assuming NetworkPolicies allow) over Tailscale.
 
-1. Identify the Pod/Service CIDRs that cover your Kubernetes cluster.  These will vary depending on [which CNI](https://kubernetes.io/docs/concepts/cluster-administration/networking/) you are using and on the Cloud Provider you are using. Add these to the `ROUTES` variable as comma-separated values.
+1. Identify the Pod/Service CIDRs that cover your Kubernetes cluster.  These will vary depending on [which CNI](https://kubernetes.io/docs/concepts/cluster-administration/networking/) you are using and on the Cloud Provider you are using. Add these to the `TS_ROUTES` variable as comma-separated values.
 
    ```bash
    SERVICE_CIDR=10.20.0.0/16
    POD_CIDR=10.42.0.0/15
-   export ROUTES=$SERVICE_CIDR,$POD_CIDR
+   export TS_ROUTES=$SERVICE_CIDR,$POD_CIDR
    ```
 
 1. Deploy the subnet-router pod.

docs/k8s/proxy.yaml

@@ -1,4 +1,4 @@
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 apiVersion: v1
@@ -26,21 +26,21 @@ spec:
   containers:
   - name: tailscale
     imagePullPolicy: Always
-    image: "{{IMAGE_TAG}}"
+    image: "ghcr.io/tailscale/tailscale:latest"
     env:
     # Store the state in a k8s secret
-    - name: KUBE_SECRET
-      value: "{{KUBE_SECRET}}"
-    - name: USERSPACE
+    - name: TS_KUBE_SECRET
+      value: "{{TS_KUBE_SECRET}}"
+    - name: TS_USERSPACE
       value: "false"
-    - name: AUTH_KEY
+    - name: TS_AUTH_KEY
       valueFrom:
         secretKeyRef:
           name: tailscale-auth
           key: AUTH_KEY
           optional: true
-    - name: DEST_IP
-      value: "{{DEST_IP}}"
+    - name: TS_DEST_IP
+      value: "{{TS_DEST_IP}}"
     securityContext:
       capabilities:
         add:

docs/k8s/role.yaml

@@ -1,4 +1,4 @@
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 apiVersion: rbac.authorization.k8s.io/v1
@@ -11,6 +11,6 @@ rules:
   # Create can not be restricted to a resource name.
   verbs: ["create"]
 - apiGroups: [""] # "" indicates the core API group
-  resourceNames: ["{{KUBE_SECRET}}"]
+  resourceNames: ["{{TS_KUBE_SECRET}}"]
   resources: ["secrets"]
   verbs: ["get", "update"]

docs/k8s/run.sh

@@ -1,4 +1,4 @@
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 
@@ -6,19 +6,32 @@
 
 export PATH=$PATH:/tailscale/bin
 
-AUTH_KEY="${AUTH_KEY:-}"
-ROUTES="${ROUTES:-}"
-DEST_IP="${DEST_IP:-}"
-EXTRA_ARGS="${EXTRA_ARGS:-}"
-USERSPACE="${USERSPACE:-true}"
-KUBE_SECRET="${KUBE_SECRET:-tailscale}"
+TS_AUTH_KEY="${TS_AUTH_KEY:-}"
+TS_ROUTES="${TS_ROUTES:-}"
+TS_DEST_IP="${TS_DEST_IP:-}"
+TS_EXTRA_ARGS="${TS_EXTRA_ARGS:-}"
+TS_USERSPACE="${TS_USERSPACE:-true}"
+TS_STATE_DIR="${TS_STATE_DIR:-}"
+TS_ACCEPT_DNS="${TS_ACCEPT_DNS:-false}"
+TS_KUBE_SECRET="${TS_KUBE_SECRET:-tailscale}"
+TS_SOCKS5_SERVER="${TS_SOCKS5_SERVER:-}"
+TS_OUTBOUND_HTTP_PROXY_LISTEN="${TS_OUTBOUND_HTTP_PROXY_LISTEN:-}"
+TS_TAILSCALED_EXTRA_ARGS="${TS_TAILSCALED_EXTRA_ARGS:-}"
 
 set -e
 
-TAILSCALED_ARGS="--state=kube:${KUBE_SECRET} --socket=/tmp/tailscaled.sock"
+TAILSCALED_ARGS="--socket=/tmp/tailscaled.sock"
 
-if [[ "${USERSPACE}" == "true" ]]; then
-  if [[ ! -z "${DEST_IP}" ]]; then
+if [[ ! -z "${KUBERNETES_SERVICE_HOST}" ]]; then
+  TAILSCALED_ARGS="${TAILSCALED_ARGS} --state=kube:${TS_KUBE_SECRET}"
+elif [[ ! -z "${TS_STATE_DIR}" ]]; then
+  TAILSCALED_ARGS="${TAILSCALED_ARGS} --statedir=${TS_STATE_DIR}"
+else
+  TAILSCALED_ARGS="${TAILSCALED_ARGS} --state=mem:"
+fi
+
+if [[ "${TS_USERSPACE}" == "true" ]]; then
+  if [[ ! -z "${TS_DEST_IP}" ]]; then
     echo "IP forwarding is not supported in userspace mode"
     exit 1
   fi
@@ -33,27 +46,39 @@ else
   fi
 fi
 
+if [[ ! -z "${TS_SOCKS5_SERVER}" ]]; then
+  TAILSCALED_ARGS="${TAILSCALED_ARGS} --socks5-server ${TS_SOCKS5_SERVER}"
+fi
+
+if [[ ! -z "${TS_OUTBOUND_HTTP_PROXY_LISTEN}" ]]; then
+  TAILSCALED_ARGS="${TAILSCALED_ARGS} --outbound-http-proxy-listen ${TS_OUTBOUND_HTTP_PROXY_LISTEN}"
+fi
+
+if [[ ! -z "${TS_TAILSCALED_EXTRA_ARGS}" ]]; then
+  TAILSCALED_ARGS="${TAILSCALED_ARGS} ${TS_TAILSCALED_EXTRA_ARGS}"
+fi
+
 echo "Starting tailscaled"
 tailscaled ${TAILSCALED_ARGS} &
 PID=$!
 
-UP_ARGS="--accept-dns=false"
-if [[ ! -z "${ROUTES}" ]]; then
-  UP_ARGS="--advertise-routes=${ROUTES} ${UP_ARGS}"
+UP_ARGS="--accept-dns=${TS_ACCEPT_DNS}"
+if [[ ! -z "${TS_ROUTES}" ]]; then
+  UP_ARGS="--advertise-routes=${TS_ROUTES} ${UP_ARGS}"
 fi
-if [[ ! -z "${AUTH_KEY}" ]]; then
-  UP_ARGS="--authkey=${AUTH_KEY} ${UP_ARGS}"
+if [[ ! -z "${TS_AUTH_KEY}" ]]; then
+  UP_ARGS="--authkey=${TS_AUTH_KEY} ${UP_ARGS}"
 fi
-if [[ ! -z "${EXTRA_ARGS}" ]]; then
-  UP_ARGS="${UP_ARGS} ${EXTRA_ARGS:-}"
+if [[ ! -z "${TS_EXTRA_ARGS}" ]]; then
+  UP_ARGS="${UP_ARGS} ${TS_EXTRA_ARGS:-}"
 fi
 
 echo "Running tailscale up"
 tailscale --socket=/tmp/tailscaled.sock up ${UP_ARGS}
 
-if [[ ! -z "${DEST_IP}" ]]; then
+if [[ ! -z "${TS_DEST_IP}" ]]; then
   echo "Adding iptables rule for DNAT"
-  iptables -t nat -I PREROUTING -d "$(tailscale --socket=/tmp/tailscaled.sock ip -4)" -j DNAT --to-destination "${DEST_IP}"
+  iptables -t nat -I PREROUTING -d "$(tailscale --socket=/tmp/tailscaled.sock ip -4)" -j DNAT --to-destination "${TS_DEST_IP}"
 fi
 
 wait ${PID}

docs/k8s/sa.yaml

@@ -1,4 +1,4 @@
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 apiVersion: v1

docs/k8s/sidecar.yaml

@@ -1,4 +1,4 @@
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 apiVersion: v1
@@ -12,14 +12,14 @@ spec:
     image: nginx
   - name: ts-sidecar
     imagePullPolicy: Always
-    image: "{{IMAGE_TAG}}"
+    image: "ghcr.io/tailscale/tailscale:latest"
     env:
       # Store the state in a k8s secret
-    - name: KUBE_SECRET
-      value: "{{KUBE_SECRET}}"
-    - name: USERSPACE
+    - name: TS_KUBE_SECRET
+      value: "{{TS_KUBE_SECRET}}"
+    - name: TS_USERSPACE
       value: "false"
-    - name: AUTH_KEY
+    - name: TS_AUTH_KEY
       valueFrom:
         secretKeyRef:
           name: tailscale-auth

docs/k8s/subnet.yaml

@@ -1,4 +1,4 @@
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 apiVersion: v1
@@ -12,21 +12,21 @@ spec:
   containers:
   - name: tailscale
     imagePullPolicy: Always
-    image: "{{IMAGE_TAG}}"
+    image: "ghcr.io/tailscale/tailscale:latest"
     env:
     # Store the state in a k8s secret
-    - name: KUBE_SECRET
-      value: "{{KUBE_SECRET}}"
-    - name: USERSPACE
+    - name: TS_KUBE_SECRET
+      value: "{{TS_KUBE_SECRET}}"
+    - name: TS_USERSPACE
       value: "true"
-    - name: AUTH_KEY
+    - name: TS_AUTH_KEY
       valueFrom:
         secretKeyRef:
           name: tailscale-auth
           key: AUTH_KEY
           optional: true
-    - name: ROUTES
-      value: "{{ROUTES}}"
+    - name: TS_ROUTES
+      value: "{{TS_ROUTES}}"
     securityContext:
       runAsUser: 1000
       runAsGroup: 1000

docs/k8s/userspace-sidecar.yaml

@@ -1,4 +1,4 @@
-# Copyright (c) 2021 Tailscale Inc & AUTHORS All rights reserved.
+# Copyright (c) 2022 Tailscale Inc & AUTHORS All rights reserved.
 # Use of this source code is governed by a BSD-style
 # license that can be found in the LICENSE file.
 apiVersion: v1
@@ -12,17 +12,17 @@ spec:
     image: nginx
   - name: ts-sidecar
     imagePullPolicy: Always
-    image: "{{IMAGE_TAG}}"
+    image: "ghcr.io/tailscale/tailscale:latest"
     securityContext:
       runAsUser: 1000
       runAsGroup: 1000
     env:
       # Store the state in a k8s secret
-    - name: KUBE_SECRET
-      value: "{{KUBE_SECRET}}"
-    - name: USERSPACE
+    - name: TS_KUBE_SECRET
+      value: "{{TS_KUBE_SECRET}}"
+    - name: TS_USERSPACE
       value: "true"
-    - name: AUTH_KEY
+    - name: TS_AUTH_KEY
       valueFrom:
         secretKeyRef:
           name: tailscale-auth

envknob/envknob.go

@@ -149,3 +149,9 @@ func UseWIPCode() bool { return Bool("TAILSCALE_USE_WIP_CODE") }
 // if already enabled and any attempt to re-enable it will result in
 // an error.
 func CanSSHD() bool { return !Bool("TS_DISABLE_SSH_SERVER") }
+
+// SSHPolicyFile returns the path, if any, to the SSHPolicy JSON file for development.
+func SSHPolicyFile() string { return String("TS_DEBUG_SSH_POLICY_FILE") }
+
+// SSHIgnoreTailnetPolicy is whether to ignore the Tailnet SSH policy for development.
+func SSHIgnoreTailnetPolicy() bool { return Bool("TS_DEBUG_SSH_IGNORE_TAILNET_POLICY") }

go.mod

@@ -5,7 +5,6 @@ go 1.18
 require (
 	filippo.io/mkcert v1.4.3
 	github.com/akutz/memconn v0.1.0
-	github.com/alessio/shellescape v1.4.1
 	github.com/alexbrainman/sspi v0.0.0-20210105120005-909beea2cc74
 	github.com/anmitsu/go-shlex v0.0.0-20200514113438-38f4b401e2be
 	github.com/aws/aws-sdk-go-v2 v1.11.2
@@ -14,20 +13,22 @@ require (
 	github.com/aws/aws-sdk-go-v2/service/s3 v1.21.0
 	github.com/aws/aws-sdk-go-v2/service/ssm v1.17.1
 	github.com/coreos/go-iptables v0.6.0
+	github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf
 	github.com/creack/pty v1.1.17
 	github.com/dave/jennifer v1.4.1
 	github.com/frankban/quicktest v1.14.0
 	github.com/go-ole/go-ole v1.2.6
 	github.com/godbus/dbus/v5 v5.0.6
 	github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da
-	github.com/google/go-cmp v0.5.7
+	github.com/google/go-cmp v0.5.8
 	github.com/google/uuid v1.3.0
 	github.com/goreleaser/nfpm v1.10.3
 	github.com/iancoleman/strcase v0.2.0
 	github.com/insomniacslk/dhcp v0.0.0-20211209223715-7d93572ebe8e
 	github.com/jsimonetti/rtnetlink v1.1.2-0.20220408201609-d380b505068b
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
-	github.com/klauspost/compress v1.13.6
+	github.com/klauspost/compress v1.15.4
+	github.com/kortschak/wol v0.0.0-20200729010619-da482cc4850a
 	github.com/mdlayher/genetlink v1.2.0
 	github.com/mdlayher/netlink v1.6.0
 	github.com/mdlayher/sdnotify v1.0.0
@@ -39,27 +40,28 @@ require (
 	github.com/tailscale/certstore v0.1.1-0.20220316223106-78d6e1c49d8d
 	github.com/tailscale/depaware v0.0.0-20210622194025-720c4b409502
 	github.com/tailscale/goexpect v0.0.0-20210902213824-6e8c725cea41
-	github.com/tailscale/golang-x-crypto v0.0.0-20220330002111-62119522bbcf
+	github.com/tailscale/golang-x-crypto v0.0.0-20220428210705-0b941c09a5e1
 	github.com/tailscale/goupnp v1.0.1-0.20210804011211-c64d0f06ea05
-	github.com/tailscale/hujson v0.0.0-20211105212140-3a0adc019d83
+	github.com/tailscale/hujson v0.0.0-20220506202205-92b4b88a9e17
+	github.com/tailscale/mkctr v0.0.0-20220601142259-c0b937af2e89
 	github.com/tailscale/netlink v1.1.1-0.20211101221916-cabfb018fe85
 	github.com/tcnksm/go-httpstat v0.2.0
 	github.com/toqueteos/webbrowser v1.2.0
 	github.com/u-root/u-root v0.8.0
 	github.com/vishvananda/netlink v1.1.1-0.20211118161826-650dca95af54
 	go4.org/mem v0.0.0-20210711025021-927187094b94
-	golang.org/x/crypto v0.0.0-20220321153916-2c7772ba3064
-	golang.org/x/net v0.0.0-20220407224826-aac1ed45d8e3
-	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
-	golang.org/x/sys v0.0.0-20220408201424-a24fb2fb8a0f
+	golang.org/x/crypto v0.0.0-20220427172511-eb4f295cb31f
+	golang.org/x/net v0.0.0-20220607020251-c690dde0001d
+	golang.org/x/sync v0.0.0-20220601150217-0de741cfad7f
+	golang.org/x/sys v0.0.0-20220610221304-9f5ed59c137d
 	golang.org/x/term v0.0.0-20210927222741-03fcf44c2211
 	golang.org/x/time v0.0.0-20211116232009-f0f3c7e86c11
-	golang.org/x/tools v0.1.11-0.20220413170336-afc6aad76eb1
-	golang.zx2c4.com/wireguard v0.0.0-20220317000134-95b48cdb3961
+	golang.org/x/tools v0.1.11
+	golang.zx2c4.com/wireguard v0.0.0-20220703234212-c31a7b1ab478
 	golang.zx2c4.com/wireguard/windows v0.4.10
 	gvisor.dev/gvisor v0.0.0-20220407223209-21871174d445
 	honnef.co/go/tools v0.4.0-0.dev.0.20220404092545-59d7a2877f83
-	inet.af/netaddr v0.0.0-20211027220019-c74959edd3b6
+	inet.af/netaddr v0.0.0-20220617031823-097006376321
 	inet.af/peercred v0.0.0-20210906144145-0893ea02156a
 	inet.af/wf v0.0.0-20211204062712-86aaea0a7310
 	nhooyr.io/websocket v1.8.7
@@ -67,6 +69,7 @@ require (
 
 require (
 	4d63.com/gochecknoglobals v0.1.0 // indirect
+	filippo.io/edwards25519 v1.0.0-rc.1 // indirect
 	github.com/Antonboom/errname v0.1.5 // indirect
 	github.com/Antonboom/nilnil v0.1.0 // indirect
 	github.com/BurntSushi/toml v1.1.0 // indirect
@@ -75,7 +78,7 @@ require (
 	github.com/Masterminds/semver v1.5.0 // indirect
 	github.com/Masterminds/semver/v3 v3.1.1 // indirect
 	github.com/Masterminds/sprig v2.22.0+incompatible // indirect
-	github.com/Microsoft/go-winio v0.5.1 // indirect
+	github.com/Microsoft/go-winio v0.5.2 // indirect
 	github.com/OpenPeeDeeP/depguard v1.0.1 // indirect
 	github.com/ProtonMail/go-crypto v0.0.0-20211112122917-428f8eabeeb3 // indirect
 	github.com/acomagu/bufpipe v1.0.3 // indirect
@@ -105,16 +108,21 @@ require (
 	github.com/cespare/xxhash/v2 v2.1.2 // indirect
 	github.com/charithe/durationcheck v0.0.9 // indirect
 	github.com/chavacava/garif v0.0.0-20210405164556-e8a0a408d6af // indirect
-	github.com/coreos/go-systemd v0.0.0-20191104093116-d3cd4ed1dbcf // indirect
+	github.com/containerd/stargz-snapshotter/estargz v0.11.4 // indirect
 	github.com/daixiang0/gci v0.2.9 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/denis-tingajkin/go-header v0.4.2 // indirect
+	github.com/docker/cli v20.10.16+incompatible // indirect
+	github.com/docker/distribution v2.8.1+incompatible // indirect
+	github.com/docker/docker v20.10.16+incompatible // indirect
+	github.com/docker/docker-credential-helpers v0.6.4 // indirect
 	github.com/emirpasic/gods v1.12.0 // indirect
 	github.com/esimonov/ifshort v1.0.3 // indirect
 	github.com/ettle/strcase v0.1.1 // indirect
 	github.com/fatih/color v1.13.0 // indirect
 	github.com/fatih/structtag v1.2.0 // indirect
 	github.com/fsnotify/fsnotify v1.5.1 // indirect
+	github.com/fxamacker/cbor/v2 v2.4.0 // indirect
 	github.com/fzipp/gocyclo v0.3.1 // indirect
 	github.com/gliderlabs/ssh v0.3.3 // indirect
 	github.com/go-critic/go-critic v0.6.1 // indirect
@@ -143,6 +151,7 @@ require (
 	github.com/golangci/revgrep v0.0.0-20210930125155-c22e5001d4f2 // indirect
 	github.com/golangci/unconvert v0.0.0-20180507085042-28b1c447d1f4 // indirect
 	github.com/google/btree v1.0.1 // indirect
+	github.com/google/go-containerregistry v0.9.0 // indirect
 	github.com/google/goterm v0.0.0-20200907032337-555d40f16ae2 // indirect
 	github.com/google/rpmpack v0.0.0-20201206194719-59e495f2b7e1 // indirect
 	github.com/gordonklaus/ineffassign v0.0.0-20210914165742-4cc7213b9bc8 // indirect
@@ -155,6 +164,7 @@ require (
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/hdevalence/ed25519consensus v0.0.0-20220222234857-c00d1f31bab3 // indirect
 	github.com/huandu/xstrings v1.3.2 // indirect
 	github.com/imdario/mergo v0.3.12 // indirect
 	github.com/inconshreveable/mousetrap v1.0.0 // indirect
@@ -198,6 +208,8 @@ require (
 	github.com/nishanths/predeclared v0.2.1 // indirect
 	github.com/olekukonko/tablewriter v0.0.5 // indirect
 	github.com/op/go-logging v0.0.0-20160315200505-970db520ece7 // indirect
+	github.com/opencontainers/go-digest v1.0.0 // indirect
+	github.com/opencontainers/image-spec v1.0.3-0.20220114050600-8b9d41f48198 // indirect
 	github.com/pelletier/go-toml v1.9.4 // indirect
 	github.com/phayes/checkstyle v0.0.0-20170904204023-bfd46e6a821d // indirect
 	github.com/pkg/diff v0.0.0-20210226163009-20ebb0f2a09e // indirect
@@ -225,7 +237,7 @@ require (
 	github.com/sourcegraph/go-diff v0.6.1 // indirect
 	github.com/spf13/afero v1.6.0 // indirect
 	github.com/spf13/cast v1.4.1 // indirect
-	github.com/spf13/cobra v1.2.1 // indirect
+	github.com/spf13/cobra v1.4.0 // indirect
 	github.com/spf13/jwalterweatherman v1.1.0 // indirect
 	github.com/spf13/pflag v1.0.5 // indirect
 	github.com/spf13/viper v1.9.0 // indirect
@@ -244,17 +256,18 @@ require (
 	github.com/ultraware/funlen v0.0.3 // indirect
 	github.com/ultraware/whitespace v0.0.4 // indirect
 	github.com/uudashr/gocognit v1.0.5 // indirect
+	github.com/vbatts/tar-split v0.11.2 // indirect
 	github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74 // indirect
+	github.com/x448/float16 v0.8.4 // indirect
 	github.com/xanzy/ssh-agent v0.3.1 // indirect
 	github.com/yeya24/promlinter v0.1.0 // indirect
 	go4.org/intern v0.0.0-20211027215823-ae77deb06f29 // indirect
-	go4.org/unsafe/assume-no-moving-gc v0.0.0-20211027215541-db492cf91b37 // indirect
+	go4.org/unsafe/assume-no-moving-gc v0.0.0-20220617031537-928513b29760 // indirect
 	golang.org/x/exp/typeparams v0.0.0-20220328175248-053ad81199eb // indirect
-	golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3 // indirect
+	golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 // indirect
 	golang.org/x/text v0.3.7 // indirect
-	golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 // indirect
 	golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224 // indirect
-	google.golang.org/protobuf v1.27.1 // indirect
+	google.golang.org/protobuf v1.28.0 // indirect
 	gopkg.in/ini.v1 v1.66.2 // indirect
 	gopkg.in/warnings.v0 v0.1.2 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect

go.sum

@@ -52,6 +52,8 @@ cloud.google.com/go/storage v1.8.0/go.mod h1:Wv1Oy7z6Yz3DshWRJFhqM/UCfaWIRTdp0RX
 cloud.google.com/go/storage v1.10.0/go.mod h1:FLPqc6j+Ki4BU591ie1oL6qBQGu2Bl/tZ9ullr3+Kg0=
 contrib.go.opencensus.io/exporter/stackdriver v0.13.4/go.mod h1:aXENhDJ1Y4lIg4EUaVTwzvYETVNZk10Pu26tevFKLUc=
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
+filippo.io/edwards25519 v1.0.0-rc.1 h1:m0VOOB23frXZvAOK44usCgLWvtsxIoMCTBGJZlpmGfU=
+filippo.io/edwards25519 v1.0.0-rc.1/go.mod h1:N1IkdkCkiLB6tki+MYJoSx2JTY9NUlxZE7eHn5EwJns=
 filippo.io/mkcert v1.4.3 h1:axpnmtrZMM8u5Hf4N3UXxboGemMOV+Tn+e+pkHM6E3o=
 filippo.io/mkcert v1.4.3/go.mod h1:64ke566uBwAQcdK3vRDABgsgVHqrfORPTw6YytZCTxk=
 github.com/Antonboom/errname v0.1.5 h1:IM+A/gz0pDhKmlt5KSNTVAvfLMb+65RxavBXpRtCUEg=
@@ -83,8 +85,8 @@ github.com/Microsoft/go-winio v0.4.14/go.mod h1:qXqCSQ3Xa7+6tgxaGTIe4Kpcdsi+P8jB
 github.com/Microsoft/go-winio v0.4.15/go.mod h1:tTuCMEN+UleMWgg9dVx4Hu52b1bJo+59jBh3ajtinzw=
 github.com/Microsoft/go-winio v0.4.16/go.mod h1:XB6nPKklQyQ7GC9LdcBEcBl8PF76WugXOPRXwdLnMv0=
 github.com/Microsoft/go-winio v0.5.0/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84=
-github.com/Microsoft/go-winio v0.5.1 h1:aPJp2QD7OOrhO5tQXqQoGSJc+DjDtWTGLOmNyAm6FgY=
-github.com/Microsoft/go-winio v0.5.1/go.mod h1:JPGBdM1cNvN/6ISo+n8V5iA4v8pBzdOpzfwIujj1a84=
+github.com/Microsoft/go-winio v0.5.2 h1:a9IhgEQBCUEk6QCdml9CiJGhAws+YwffDHEMp1VMrpA=
+github.com/Microsoft/go-winio v0.5.2/go.mod h1:WpS1mjBmmwHBEWmogvA2mj8546UReBk4v8QkMxJ6pZY=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/OpenPeeDeeP/depguard v1.0.1 h1:VlW4R6jmBIv3/u1JNlawEvJMM4J+dPORPaZasQee8Us=
 github.com/OpenPeeDeeP/depguard v1.0.1/go.mod h1:xsIw86fROiiwelg+jB2uM9PiKihMMmUx/1V+TNhjQvM=
@@ -104,8 +106,6 @@ github.com/alecthomas/template v0.0.0-20190718012654-fb15b899a751/go.mod h1:LOuy
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190717042225-c3de453c63f4/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
 github.com/alecthomas/units v0.0.0-20190924025748-f65c72e2690d/go.mod h1:rBZYJk541a8SKzHPHnH3zbiI+7dagKZ0cgpgrD7Fyho=
-github.com/alessio/shellescape v1.4.1 h1:V7yhSDDn8LP4lc4jS8pFkt0zCnzVJlG5JXy9BVKJUX0=
-github.com/alessio/shellescape v1.4.1/go.mod h1:PZAiSCk0LJaZkiCSkPv8qIobYglO3FPpyFjDCtHLS30=
 github.com/alexbrainman/sspi v0.0.0-20210105120005-909beea2cc74 h1:Kk6a4nehpJ3UuJRqlA3JxYxBZEqCeOmATOvrbT4p9RA=
 github.com/alexbrainman/sspi v0.0.0-20210105120005-909beea2cc74/go.mod h1:cEWa1LVoE5KvSD9ONXsZrj0z6KqySlCCNKHlLzbqAt4=
 github.com/alexkohler/prealloc v1.0.0 h1:Hbq0/3fJPQhNkN0dR95AVrr6R7tou91y0uHG5pOcUuw=
@@ -212,6 +212,8 @@ github.com/cncf/udpa/go v0.0.0-20200629203442-efcf912fb354/go.mod h1:WmhPx2Nbnht
 github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
 github.com/cncf/xds/go v0.0.0-20210312221358-fbca930ec8ed/go.mod h1:eXthEFrGJvWHgFFCl3hGmgk+/aYT6PnTQLykKQRLhEs=
 github.com/cockroachdb/datadriven v0.0.0-20190809214429-80d97fb3cbaa/go.mod h1:zn76sxSg3SzpJ0PPJaLDCu+Bu0Lg3sKTORVIj19EIF8=
+github.com/containerd/stargz-snapshotter/estargz v0.11.4 h1:LjrYUZpyOhiSaU7hHrdR82/RBoxfGWSaC0VeSSMXqnk=
+github.com/containerd/stargz-snapshotter/estargz v0.11.4/go.mod h1:7vRJIcImfY8bpifnMjt+HTJoQxASq7T28MYbP15/Nf0=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
 github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
 github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
@@ -231,6 +233,7 @@ github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfc
 github.com/cpuguy83/go-md2man v1.0.10/go.mod h1:SmD6nW6nTyfqj6ABTjUi3V3JVMnlJmwcJI5acqYI6dE=
 github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
+github.com/cpuguy83/go-md2man/v2 v2.0.1/go.mod h1:tgQtvFlXSQOSOSIRvRPT7W67SCa46tRHOmNcaadrF8o=
 github.com/creack/pty v1.1.7/go.mod h1:lj5s0c3V2DBrqTV7llrYr5NG6My20zk30Fl46Y7DoTY=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/creack/pty v1.1.17 h1:QeVUsEDNrLBW4tMgZHvxy18sKtr6VI492kBhUfhDJNI=
@@ -239,6 +242,7 @@ github.com/daixiang0/gci v0.2.4/go.mod h1:+AV8KmHTGxxwp/pY84TLQfFKp2vuKXXJVzF3kD
 github.com/daixiang0/gci v0.2.7/go.mod h1:+4dZ7TISfSmqfAGv59ePaHfNzgGtIkHAhhdKggP1JAc=
 github.com/daixiang0/gci v0.2.9 h1:iwJvwQpBZmMg31w+QQ6jsyZ54KEATn6/nfARbBNW294=
 github.com/daixiang0/gci v0.2.9/go.mod h1:+4dZ7TISfSmqfAGv59ePaHfNzgGtIkHAhhdKggP1JAc=
+github.com/danieljoos/wincred v1.1.0/go.mod h1:XYlo+eRTsVA9aHGp7NGjFkPla4m+DCL7hqDjlFjiygg=
 github.com/dave/jennifer v1.4.1 h1:XyqG6cn5RQsTj3qlWQTKlRGAyrTcsk1kUmWdZBzRjDw=
 github.com/dave/jennifer v1.4.1/go.mod h1:7jEdnm+qBcxl8PC0zyp7vxcpSRnzXSt9r39tpTVGlwA=
 github.com/davecgh/go-spew v0.0.0-20161028175848-04cdfd42973b/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -250,6 +254,14 @@ github.com/denis-tingajkin/go-header v0.4.2 h1:jEeSF4sdv8/3cT/WY8AgDHUoItNSoEZ7q
 github.com/denis-tingajkin/go-header v0.4.2/go.mod h1:eLRHAVXzE5atsKAnNRDB90WHCFFnBUn4RN0nRcs1LJA=
 github.com/dgrijalva/jwt-go v3.2.0+incompatible/go.mod h1:E3ru+11k8xSBh+hMPgOLZmtrrCbhqsmaPHjLKYnJCaQ=
 github.com/dgryski/go-sip13 v0.0.0-20181026042036-e10d5fee7954/go.mod h1:vAd38F8PWV+bWy6jNmig1y/TA+kYO4g3RSRF0IAv0no=
+github.com/docker/cli v20.10.16+incompatible h1:aLQ8XowgKpR3/IysPj8qZQJBVQ+Qws61icFuZl6iKYs=
+github.com/docker/cli v20.10.16+incompatible/go.mod h1:JLrzqnKDaYBop7H2jaqPtU4hHvMKP+vjCwu2uszcLI8=
+github.com/docker/distribution v2.8.1+incompatible h1:Q50tZOPR6T/hjNsyc9g8/syEs6bk8XXApsHjKukMl68=
+github.com/docker/distribution v2.8.1+incompatible/go.mod h1:J2gT2udsDAN96Uj4KfcMRqY0/ypR+oyYUYmja8H+y+w=
+github.com/docker/docker v20.10.16+incompatible h1:2Db6ZR/+FUR3hqPMwnogOPHFn405crbpxvWzKovETOQ=
+github.com/docker/docker v20.10.16+incompatible/go.mod h1:eEKB0N0r5NX/I1kEveEz05bcu8tLC/8azJZsviup8Sk=
+github.com/docker/docker-credential-helpers v0.6.4 h1:axCks+yV+2MR3/kZhAmy07yC56WZ2Pwu/fKWtKuZB0o=
+github.com/docker/docker-credential-helpers v0.6.4/go.mod h1:ofX3UI0Gz1TteYBjtgs07O36Pyasyp66D2uKT7H8W1c=
 github.com/dustin/go-humanize v0.0.0-20171111073723-bb3d318650d4/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/dustin/go-humanize v1.0.0/go.mod h1:HtrtbFcZ19U5GC7JDqmcUSB87Iq5E25KnS6fMYU6eOk=
 github.com/dvyukov/go-fuzz v0.0.0-20210103155950-6a8e9d1f2415/go.mod h1:11Gm+ccJnvAhCNLlf5+cS9KjtbaD5I5zaZpFMsTHWTw=
@@ -284,6 +296,8 @@ github.com/fsnotify/fsnotify v1.4.9/go.mod h1:znqG4EE+3YCdAaPaxE2ZRY/06pZUdp0tY4
 github.com/fsnotify/fsnotify v1.5.1 h1:mZcQUHVQUQWoPXXtuf9yuEXKudkV2sx1E06UadKWpgI=
 github.com/fsnotify/fsnotify v1.5.1/go.mod h1:T3375wBYaZdLLcVNkcVbzGHY7f1l/uK5T5Ai1i3InKU=
 github.com/fullstorydev/grpcurl v1.6.0/go.mod h1:ZQ+ayqbKMJNhzLmbpCiurTVlaK2M/3nqZCxaQ2Ze/sM=
+github.com/fxamacker/cbor/v2 v2.4.0 h1:ri0ArlOR+5XunOP8CRUowT0pSJOwhW098ZCUyskZD88=
+github.com/fxamacker/cbor/v2 v2.4.0/go.mod h1:TA1xS00nchWmaBnEIxPSE5oHLuJBAVvqrtAnWBwBCVo=
 github.com/fzipp/gocyclo v0.3.1 h1:A9UeX3HJSXTBzvHzhqoYVuE0eAhe+aM8XBCCwsPMZOc=
 github.com/fzipp/gocyclo v0.3.1/go.mod h1:DJHO6AUmbdqj2ET4Z9iArSuwWgYDRryYt2wASxc7x3E=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
@@ -469,8 +483,11 @@ github.com/google/go-cmp v0.5.3/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/
 github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
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@@ -1026,8 +1054,9 @@ github.com/spf13/cast v1.4.1/go.mod h1:Qx5cxh0v+4UWYiBimWS+eyWzqEqokIECu5etghLkU
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 go4.org/unsafe/assume-no-moving-gc v0.0.0-20201222180813-1025295fd063/go.mod h1:FftLjUGFEDu5k8lt0ddY+HcrH/qU/0qk+H8j9/nTl3E=
-go4.org/unsafe/assume-no-moving-gc v0.0.0-20211027215541-db492cf91b37 h1:Tx9kY6yUkLge/pFG7IEMwDZy6CS2ajFc9TvQdPCW0uA=
 go4.org/unsafe/assume-no-moving-gc v0.0.0-20211027215541-db492cf91b37/go.mod h1:FftLjUGFEDu5k8lt0ddY+HcrH/qU/0qk+H8j9/nTl3E=
+go4.org/unsafe/assume-no-moving-gc v0.0.0-20220617031537-928513b29760 h1:FyBZqvoA/jbNzuAWLQE2kG820zMAkcilx6BMjGbL/E4=
+go4.org/unsafe/assume-no-moving-gc v0.0.0-20220617031537-928513b29760/go.mod h1:FftLjUGFEDu5k8lt0ddY+HcrH/qU/0qk+H8j9/nTl3E=
 golang.org/x/crypto v0.0.0-20180501155221-613d6eafa307/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
 golang.org/x/crypto v0.0.0-20181029021203-45a5f77698d3/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
@@ -1227,8 +1267,8 @@ golang.org/x/crypto v0.0.0-20210711020723-a769d52b0f97/go.mod h1:GvvjBRRGRdwPK5y
 golang.org/x/crypto v0.0.0-20210817164053-32db794688a5/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.0.0-20210921155107-089bfa567519/go.mod h1:GvvjBRRGRdwPK5ydBHafDWAxML/pGHZbMvKqRZ5+Abc=
 golang.org/x/crypto v0.0.0-20211117183948-ae814b36b871/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
-golang.org/x/crypto v0.0.0-20220321153916-2c7772ba3064 h1:S25/rfnfsMVgORT4/J61MJ7rdyseOZOyvLIrZEZ7s6s=
-golang.org/x/crypto v0.0.0-20220321153916-2c7772ba3064/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
+golang.org/x/crypto v0.0.0-20220427172511-eb4f295cb31f h1:OeJjE6G4dgCY4PIXvIRQbE8+RX+uXZyGhUy/ksMGJoc=
+golang.org/x/crypto v0.0.0-20220427172511-eb4f295cb31f/go.mod h1:IxCIyHEi3zRg3s0A5j5BB6A9Jmi73HwBIUl50j+osU4=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/exp v0.0.0-20190306152737-a1d7652674e8/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
@@ -1273,8 +1313,8 @@ golang.org/x/mod v0.4.1/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.4.2/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/mod v0.5.0/go.mod h1:5OXOZSfqPIIbmVBIIKWRFfZjPR0E5r58TLhUjH0a2Ro=
 golang.org/x/mod v0.5.1/go.mod h1:5OXOZSfqPIIbmVBIIKWRFfZjPR0E5r58TLhUjH0a2Ro=
-golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3 h1:kQgndtyPBW/JIYERgdxfwMYh3AVStj88WQTlNDi2a+o=
-golang.org/x/mod v0.6.0-dev.0.20220106191415-9b9b3d81d5e3/go.mod h1:3p9vT2HGsQu2K1YbXdKPJLVgG5VJdoTa1poYQBtP1AY=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4 h1:6zppjxzCulZykYSLyVDYbneBfbaBIQPYMevg0bEwv2s=
+golang.org/x/mod v0.6.0-dev.0.20220419223038-86c51ed26bb4/go.mod h1:jJ57K6gSWd91VN4djpZkiMVwK6gcyfeH4XE8wZrZaV4=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -1338,8 +1378,8 @@ golang.org/x/net v0.0.0-20210928044308-7d9f5e0b762b/go.mod h1:9nx3DQGgdP8bBQD5qx
 golang.org/x/net v0.0.0-20211015210444-4f30a5c0130f/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20211112202133-69e39bad7dc2/go.mod h1:9nx3DQGgdP8bBQD5qxJ1jj9UTztislL4KSBs9R2vV5Y=
 golang.org/x/net v0.0.0-20220127200216-cd36cc0744dd/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
-golang.org/x/net v0.0.0-20220407224826-aac1ed45d8e3 h1:EN5+DfgmRMvRUrMGERW2gQl3Vc+Z7ZMnI/xdEpPSf0c=
-golang.org/x/net v0.0.0-20220407224826-aac1ed45d8e3/go.mod h1:CfG3xpIq0wQ8r1q4Su4UZFWDARRcnwPjda9FqA0JpMk=
+golang.org/x/net v0.0.0-20220607020251-c690dde0001d h1:4SFsTMi4UahlKoloni7L4eYzhFRifURQLw+yv0QDCx8=
+golang.org/x/net v0.0.0-20220607020251-c690dde0001d/go.mod h1:XRhObCWvk6IyKnWLug+ECip1KBveYUHfp+8e9klMJ9c=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20190226205417-e64efc72b421/go.mod h1:gOpvHmFTYa4IltrdGE7lF6nIHvwfUNPOp7c8zoXwtLw=
@@ -1370,8 +1410,9 @@ golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201020160332-67f06af15bc9/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
 golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20220601150217-0de741cfad7f h1:Ax0t5p6N38Ga0dThY21weqDEyz2oklo4IvDkpigvkD8=
+golang.org/x/sync v0.0.0-20220601150217-0de741cfad7f/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180823144017-11551d06cbcc/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -1478,8 +1519,8 @@ golang.org/x/sys v0.0.0-20211102192858-4dd72447c267/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20211105183446-c75c47738b0c/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20211216021012-1d35b9e2eb4e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220128215802-99c3d69c2c27/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20220408201424-a24fb2fb8a0f h1:8w7RhxzTVgUzw/AH/9mUV5q0vMgy40SQRursCcfmkCw=
-golang.org/x/sys v0.0.0-20220408201424-a24fb2fb8a0f/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.0.0-20220610221304-9f5ed59c137d h1:Zu/JngovGLVi6t2J3nmAf3AoTDwuzw85YZ3b9o4yU7s=
+golang.org/x/sys v0.0.0-20220610221304-9f5ed59c137d/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/term v0.0.0-20210927222741-03fcf44c2211 h1:JGgROgKl9N8DuW20oFS5gxc+lE67/N3FcwmBPMe7ArY=
@@ -1612,18 +1653,17 @@ golang.org/x/tools v0.1.5/go.mod h1:o0xws9oXOQQZyjljx8fwUC0k7L1pTE6eaCbjGeHmOkk=
 golang.org/x/tools v0.1.6/go.mod h1:LGqMHiF4EqQNHR1JncWGqT5BVaXmza+X+BDGol+dOxo=
 golang.org/x/tools v0.1.7/go.mod h1:LGqMHiF4EqQNHR1JncWGqT5BVaXmza+X+BDGol+dOxo=
 golang.org/x/tools v0.1.8-0.20211102182255-bb4add04ddef/go.mod h1:nABZi5QlRsZVlzPpHl034qft6wpY4eDcsTt5AaioBiU=
-golang.org/x/tools v0.1.11-0.20220413170336-afc6aad76eb1 h1:Z3vE1sGlC7qiyFJkkDcZms8Y3+yV8+W7HmDSmuf71tM=
-golang.org/x/tools v0.1.11-0.20220413170336-afc6aad76eb1/go.mod h1:Uh6Zz+xoGYZom868N8YTex3t7RhtHDBrE8Gzo9bV56E=
+golang.org/x/tools v0.1.11 h1:loJ25fNOEhSXfHrpoGj91eCUThwdNX6u24rO1xnNteY=
+golang.org/x/tools v0.1.11/go.mod h1:SgwaegtQh8clINPpECJMqnxLv9I09HLqnW3RMqW0CA4=
 golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
 golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224 h1:Ug9qvr1myri/zFN6xL17LSCBGFDnphBBhzmILHsM5TY=
 golang.zx2c4.com/wintun v0.0.0-20211104114900-415007cec224/go.mod h1:deeaetjYA+DHMHg+sMSMI58GrEteJUUzzw7en6TJQcI=
 golang.zx2c4.com/wireguard v0.0.0-20210905140043-2ef39d47540c/go.mod h1:laHzsbfMhGSobUmruXWAyMKKHSqvIcrqZJMyHD+/3O8=
-golang.zx2c4.com/wireguard v0.0.0-20220317000134-95b48cdb3961 h1:oIXcKhP1Ge6cRqdpQuldl0hf4mjIsNaXojabghlHuTs=
-golang.zx2c4.com/wireguard v0.0.0-20220317000134-95b48cdb3961/go.mod h1:bVQfyl2sCM/QIIGHpWbFGfHPuDvqnCNkT6MQLTCjO/U=
+golang.zx2c4.com/wireguard v0.0.0-20220703234212-c31a7b1ab478 h1:vDy//hdR+GnROE3OdYbQKt9rdtNdHkDtONvpRwmls/0=
+golang.zx2c4.com/wireguard v0.0.0-20220703234212-c31a7b1ab478/go.mod h1:bVQfyl2sCM/QIIGHpWbFGfHPuDvqnCNkT6MQLTCjO/U=
 golang.zx2c4.com/wireguard/windows v0.4.10 h1:HmjzJnb+G4NCdX+sfjsQlsxGPuYaThxRbZUZFLyR0/s=
 golang.zx2c4.com/wireguard/windows v0.4.10/go.mod h1:v7w/8FC48tTBm1IzScDVPEEb0/GjLta+T0ybpP9UWRg=
 google.golang.org/api v0.4.0/go.mod h1:8k5glujaEP+g9n7WNsDg8QP6cUVNI86fCNMcbazEtwE=
@@ -1763,8 +1803,9 @@ google.golang.org/protobuf v1.24.0/go.mod h1:r/3tXBNzIEhYS9I1OUVjXDlt8tc493IdKGj
 google.golang.org/protobuf v1.25.0/go.mod h1:9JNX74DMeImyA3h4bdi1ymwjUzf21/xIlbajtzgsN7c=
 google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
 google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.27.1 h1:SnqbnDw1V7RiZcXPx5MEeqPv2s79L9i7BJUlG/+RurQ=
 google.golang.org/protobuf v1.27.1/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
+google.golang.org/protobuf v1.28.0 h1:w43yiav+6bVFTBQFZX0r7ipe9JQ1QsbMgHwbBziscLw=
+google.golang.org/protobuf v1.28.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -1803,6 +1844,7 @@ gopkg.in/yaml.v3 v3.0.0-20200313102051-9f266ea9e77c/go.mod h1:K4uyk7z7BCEPqu6E+C
 gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b h1:h8qDotaEPuJATrMmW04NCwg7v22aHH28wwpauUhK9Oo=
 gopkg.in/yaml.v3 v3.0.0-20210107192922-496545a6307b/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
+gotest.tools/v3 v3.0.3 h1:4AuOwCGf4lLR9u3YOe2awrHygurzhO/HeQ6laiA6Sx0=
 gvisor.dev/gvisor v0.0.0-20220407223209-21871174d445 h1:pLNQCtMzh4O6rdhoUeWHuutt4yMft+B9Cgw/bezWchE=
 gvisor.dev/gvisor v0.0.0-20220407223209-21871174d445/go.mod h1:tWwEcFvJavs154OdjFCw78axNrsDlz4Zh8jvPqwcpGI=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
@@ -1820,8 +1862,8 @@ howett.net/plist v0.0.0-20181124034731-591f970eefbb/go.mod h1:vMygbs4qMhSZSc4lCU
 howett.net/plist v1.0.0 h1:7CrbWYbPPO/PyNy38b2EB/+gYbjCe2DXBxgtOOZbSQM=
 howett.net/plist v1.0.0/go.mod h1:lqaXoTrLY4hg8tnEzNru53gicrbv7rrk+2xJA/7hw9g=
 inet.af/netaddr v0.0.0-20210515010201-ad03edc7c841/go.mod h1:z0nx+Dh+7N7CC8V5ayHtHGpZpxLQZZxkIaaz6HN65Ls=
-inet.af/netaddr v0.0.0-20211027220019-c74959edd3b6 h1:acCzuUSQ79tGsM/O50VRFySfMm19IoMKL+sZztZkCxw=
-inet.af/netaddr v0.0.0-20211027220019-c74959edd3b6/go.mod h1:y3MGhcFMlh0KZPMuXXow8mpjxxAk3yoDNsp4cQz54i8=
+inet.af/netaddr v0.0.0-20220617031823-097006376321 h1:B4dC8ySKTQXasnjDTMsoCMf1sQG4WsMej0WXaHxunmU=
+inet.af/netaddr v0.0.0-20220617031823-097006376321/go.mod h1:OIezDfdzOgFhuw4HuWapWq2e9l0H9tK4F1j+ETRtF3k=
 inet.af/peercred v0.0.0-20210906144145-0893ea02156a h1:qdkS8Q5/i10xU2ArJMKYhVa1DORzBfYS/qA2UK2jheg=
 inet.af/peercred v0.0.0-20210906144145-0893ea02156a/go.mod h1:FjawnflS/udxX+SvpsMgZfdqx2aykOlkISeAsADi5IU=
 inet.af/wf v0.0.0-20211204062712-86aaea0a7310 h1:0jKHTf+W75kYRyg5bto1UT+r18QmAz2u/5pAs/fx4zo=

go.toolchain.rev

@@ -1 +1 @@
-5ce3ec4d89c72f2a2b6f6f5089c950d7a6a33530
+04d67b90d8cfd6f822664220f79e0e69cacb6b5c

health/health.go

@@ -45,6 +45,7 @@ var (
 	anyInterfaceUp          = true // until told otherwise
 	udp4Unbound             bool
 	controlHealth           []string
+	lastLoginErr            error
 )
 
 // Subsystem is the name of a subsystem whose health can be monitored.
@@ -287,6 +288,15 @@ func SetUDP4Unbound(unbound bool) {
 	selfCheckLocked()
 }
 
+// SetAuthRoutineInError records the latest error encountered as a result of a
+// login attempt. Providing a nil error indicates successful login, or that
+// being logged in w/coordination is not currently desired.
+func SetAuthRoutineInError(err error) {
+	mu.Lock()
+	defer mu.Unlock()
+	lastLoginErr = err
+}
+
 func timerSelfCheck() {
 	mu.Lock()
 	defer mu.Unlock()
@@ -321,9 +331,12 @@ func overallErrorLocked() error {
 	if !anyInterfaceUp {
 		return errors.New("network down")
 	}
-	if ipnState != "Running" || !ipnWantRunning {
+	if !ipnWantRunning {
 		return fmt.Errorf("state=%v, wantRunning=%v", ipnState, ipnWantRunning)
 	}
+	if lastLoginErr != nil {
+		return fmt.Errorf("not logged in, last login error=%v", lastLoginErr)
+	}
 	now := time.Now()
 	if !inMapPoll && (lastMapPollEndedAt.IsZero() || now.Sub(lastMapPollEndedAt) > 10*time.Second) {
 		return errors.New("not in map poll")

hostinfo/hostinfo.go

@@ -17,11 +17,15 @@ import (
 
 	"go4.org/mem"
 	"tailscale.com/tailcfg"
+	"tailscale.com/types/opt"
+	"tailscale.com/util/cloudenv"
 	"tailscale.com/util/dnsname"
 	"tailscale.com/util/lineread"
 	"tailscale.com/version"
 )
 
+var started = time.Now()
+
 // New returns a partially populated Hostinfo for the current host.
 func New() *tailcfg.Hostinfo {
 	hostname, _ := os.Hostname()
@@ -31,9 +35,11 @@ func New() *tailcfg.Hostinfo {
 		Hostname:    hostname,
 		OS:          version.OS(),
 		OSVersion:   GetOSVersion(),
+		Desktop:     desktop(),
 		Package:     packageTypeCached(),
 		GoArch:      runtime.GOARCH,
 		DeviceModel: deviceModel(),
+		Cloud:       string(cloudenv.Get()),
 	}
 }
 
@@ -97,6 +103,7 @@ func GetEnvType() EnvType {
 var (
 	deviceModelAtomic atomic.Value // of string
 	osVersionAtomic   atomic.Value // of string
+	desktopAtomic     atomic.Value // of opt.Bool
 	packagingType     atomic.Value // of string
 )
 
@@ -117,6 +124,31 @@ func deviceModel() string {
 	return s
 }
 
+func desktop() (ret opt.Bool) {
+	if runtime.GOOS != "linux" {
+		return opt.Bool("")
+	}
+	if v := desktopAtomic.Load(); v != nil {
+		v, _ := v.(opt.Bool)
+		return v
+	}
+
+	seenDesktop := false
+	lineread.File("/proc/net/unix", func(line []byte) error {
+		seenDesktop = seenDesktop || mem.Contains(mem.B(line), mem.S(" @/tmp/dbus-"))
+		seenDesktop = seenDesktop || mem.Contains(mem.B(line), mem.S(".X11-unix"))
+		seenDesktop = seenDesktop || mem.Contains(mem.B(line), mem.S("/wayland-1"))
+		return nil
+	})
+	ret.Set(seenDesktop)
+
+	// Only cache after a minute - compositors might not have started yet.
+	if time.Since(started) > time.Minute {
+		desktopAtomic.Store(ret)
+	}
+	return ret
+}
+
 func getEnvType() EnvType {
 	if inKnative() {
 		return KNative

hostinfo/hostinfo_freebsd.go

@@ -27,12 +27,7 @@ func osVersionFreebsd() string {
 
 	var attrBuf strings.Builder
 	attrBuf.WriteString("; version=")
-	for _, b := range un.Release {
-		if b == 0 {
-			break
-		}
-		attrBuf.WriteByte(byte(b))
-	}
+	attrBuf.WriteString(unix.ByteSliceToString(un.Release[:]))
 	attr := attrBuf.String()
 
 	version := "FreeBSD"