WIP: playing with using gvisor's netstack for pure userspace TCP/relaying

.github/workflows/depaware.yml

@@ -1,28 +0,0 @@
-name: depaware
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - '*'
-
-jobs:
-  build:
-    runs-on: ubuntu-latest
-
-    steps:
-    - name: Set up Go
-      uses: actions/setup-go@v1
-      with:
-        go-version: 1.15
-
-    - name: Check out code
-      uses: actions/checkout@v1
-
-    - name: depaware tailscaled
-      run: go run github.com/tailscale/depaware --check tailscale.com/cmd/tailscaled
-
-    - name: depaware tailscale
-      run: go run github.com/tailscale/depaware --check tailscale.com/cmd/tailscale

.github/workflows/windows.yml

@@ -1,52 +0,0 @@
-name: Windows
-
-on:
-  push:
-    branches:
-      - main
-  pull_request:
-    branches:
-      - '*'
-
-jobs:
-  test:
-    runs-on: windows-latest
-
-    if: "!contains(github.event.head_commit.message, '[ci skip]')"
-
-    steps:
-
-    - name: Install Go
-      uses: actions/setup-go@v2
-      with:
-        go-version: 1.15.x
-
-    - name: Checkout code
-      uses: actions/checkout@v2
-
-    - name: Restore Cache
-      uses: actions/cache@v2
-      with:
-        path: ~/go/pkg/mod
-        key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
-        restore-keys: |
-          ${{ runner.os }}-go-
-
-    - name: Test
-      run: go test ./...
-
-    - uses: k0kubun/action-slack@v2.0.0
-      with:
-        payload: |
-          {
-            "attachments": [{
-              "text": "${{ 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'
-

Makefile

@@ -4,15 +4,7 @@ usage:
 vet:
 	go vet ./...
 
-updatedeps:
-	go run github.com/tailscale/depaware --update tailscale.com/cmd/tailscaled
-	go run github.com/tailscale/depaware --update tailscale.com/cmd/tailscale
-
-depaware:
-	go run github.com/tailscale/depaware --check tailscale.com/cmd/tailscaled
-	go run github.com/tailscale/depaware --check tailscale.com/cmd/tailscale
-
-check: staticcheck vet depaware
+check: staticcheck vet
 
 staticcheck:
 	go run honnef.co/go/tools/cmd/staticcheck -- $$(go list ./... | grep -v tempfork)

README.md

@@ -30,18 +30,6 @@ wrappers that are not open source.
 go install tailscale.com/cmd/tailscale{,d}
 ```
 
-If you're packaging Tailscale for distribution, use `build_dist.sh`
-instead, to burn commit IDs and version info into the binaries:
-
-```
-./build_dist.sh tailscale.com/cmd/tailscale
-./build_dist.sh tailscale.com/cmd/tailscaled
-```
-
-If your distro has conventions that preclude the use of
-`build_dist.sh`, please do the equivalent of what it does in your
-distro's way, so that bug reports contain useful version information.
-
 We only guarantee to support the latest Go release and any Go beta or
 release candidate builds (currently Go 1.15) in module mode. It might
 work in earlier Go versions or in GOPATH mode, but we're making no

VERSION.txt

@@ -1 +0,0 @@
-1.2.2

build_dist.sh

@@ -1,16 +0,0 @@
-#!/usr/bin/env sh
-#
-# Runs `go build` with flags configured for binary distribution. All
-# it does differently from `go build` is burn git commit and version
-# information into the binaries, so that we can track down user
-# issues.
-#
-# If you're packaging Tailscale for a distro, please consider using
-# this script, or executing equivalent commands in your
-# distro-specific build system.
-
-set -eu
-
-eval $(./version/version.sh)
-
-exec go build -tags xversion -ldflags "-X tailscale.com/version.Long=${VERSION_LONG} -X tailscale.com/version.Short=${VERSION_SHORT} -X tailscale.com/version.GitCommit=${VERSION_GIT_HASH}" "$@"

cmd/cloner/cloner.go

@@ -33,7 +33,6 @@ 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")
 )
 
 func main() {
@@ -87,8 +86,8 @@ func main() {
 					}
 					pkg := typeNameObj.Pkg()
 					gen(buf, imports, typeName, typ, pkg)
-					found = true
 				}
+				found = true
 			}
 		}
 		if !found {
@@ -96,31 +95,6 @@ func main() {
 		}
 	}
 
-	w := func(format string, args ...interface{}) {
-		fmt.Fprintf(buf, format+"\n", args...)
-	}
-	if *flagCloneFunc {
-		w("// Clone duplicates src into dst and reports whether it succeeded.")
-		w("// To succeed, <src, dst> must be of types <*T, *T> or <*T, **T>,")
-		w("// where T is one of %s.", *flagTypes)
-		w("func Clone(dst, src interface{}) bool {")
-		w("	switch src := src.(type) {")
-		for _, typeName := range typeNames {
-			w("	case *%s:", typeName)
-			w("		switch dst := dst.(type) {")
-			w("		case *%s:", typeName)
-			w("			*dst = *src.Clone()")
-			w("			return true")
-			w("		case **%s:", typeName)
-			w("			*dst = src.Clone()")
-			w("			return true")
-			w("		}")
-		}
-		w("	}")
-		w("	return false")
-		w("}")
-	}
-
 	contents := new(bytes.Buffer)
 	fmt.Fprintf(contents, header, *flagTypes, pkg.Name)
 	fmt.Fprintf(contents, "import (\n")
@@ -169,19 +143,7 @@ func gen(buf *bytes.Buffer, imports map[string]struct{}, name string, typ *types
 
 	switch t := typ.Underlying().(type) {
 	case *types.Struct:
-		// We generate two bits of code simultaneously while we walk the struct.
-		// One is the Clone method itself, which we write directly to buf.
-		// The other is a variable assignment that will fail if the struct
-		// changes without the Clone method getting regenerated.
-		// We write that to regenBuf, and then append it to buf at the end.
-		regenBuf := new(bytes.Buffer)
-		writeRegen := func(format string, args ...interface{}) {
-			fmt.Fprintf(regenBuf, format+"\n", args...)
-		}
-		writeRegen("// A compilation failure here means this code must be regenerated, with command:")
-		writeRegen("//   tailscale.com/cmd/cloner -type %s", *flagTypes)
-		writeRegen("var _%sNeedsRegeneration = %s(struct {", name, name)
-
+		_ = t
 		name := typ.Obj().Name()
 		fmt.Fprintf(buf, "// Clone makes a deep copy of %s.\n", name)
 		fmt.Fprintf(buf, "// The result aliases no memory with the original.\n")
@@ -197,9 +159,6 @@ func gen(buf *bytes.Buffer, imports map[string]struct{}, name string, typ *types
 		for i := 0; i < t.NumFields(); i++ {
 			fname := t.Field(i).Name()
 			ft := t.Field(i).Type()
-
-			writeRegen("\t%s %s", fname, importedName(ft))
-
 			if !containsPointers(ft) {
 				continue
 			}
@@ -261,10 +220,6 @@ func gen(buf *bytes.Buffer, imports map[string]struct{}, name string, typ *types
 		}
 		writef("return dst")
 		fmt.Fprintf(buf, "}\n\n")
-
-		writeRegen("}{})\n")
-
-		buf.Write(regenBuf.Bytes())
 	}
 }
 

cmd/derper/derper.go

@@ -13,7 +13,6 @@ import (
 	"expvar"
 	"flag"
 	"fmt"
-	"html"
 	"io"
 	"io/ioutil"
 	"log"
@@ -63,7 +62,7 @@ func loadConfig() config {
 	}
 	b, err := ioutil.ReadFile(*configPath)
 	switch {
-	case errors.Is(err, os.ErrNotExist):
+	case os.IsNotExist(err):
 		return writeNewConfig()
 	case err != nil:
 		log.Fatal(err)
@@ -230,10 +229,10 @@ func debugHandler(s *derp.Server) http.Handler {
 <h1>DERP debug</h1>
 <ul>
 `)
-		f("<li><b>Hostname:</b> %v</li>\n", html.EscapeString(*hostname))
+		f("<li><b>Hostname:</b> %v</li>\n", *hostname)
 		f("<li><b>Uptime:</b> %v</li>\n", tsweb.Uptime())
 		f("<li><b>Mesh Key:</b> %v</li>\n", s.HasMeshKey())
-		f("<li><b>Version:</b> %v</li>\n", html.EscapeString(version.Long))
+		f("<li><b>Version:</b> %v</li>\n", version.LONG)
 
 		f(`<li><a href="/debug/vars">/debug/vars</a> (Go)</li>
    <li><a href="/debug/varz">/debug/varz</a> (Prometheus)</li>

cmd/microproxy/microproxy.go

@@ -34,7 +34,6 @@ var (
 	logCollection = flag.String("logcollection", "", "If non-empty, logtail collection to log to")
 	nodeExporter  = flag.String("node-exporter", "http://localhost:9100", "URL of the local prometheus node exporter")
 	goVarsURL     = flag.String("go-vars-url", "http://localhost:8383/debug/vars", "URL of a local Go server's /debug/vars endpoint")
-	insecure      = flag.Bool("insecure", false, "serve over http, for development")
 )
 
 func main() {
@@ -67,15 +66,12 @@ func main() {
 	httpsrv := &http.Server{
 		Addr:    *addr,
 		Handler: mux,
+		TLSConfig: &tls.Config{
+			GetCertificate: ch.GetCertificate,
+		},
 	}
 
-	if !*insecure {
-		httpsrv.TLSConfig = &tls.Config{GetCertificate: ch.GetCertificate}
-		err = httpsrv.ListenAndServeTLS("", "")
-	} else {
-		err = httpsrv.ListenAndServe()
-	}
-	if err != nil && err != http.ErrServerClosed {
+	if err := httpsrv.ListenAndServeTLS("", ""); err != nil && err != http.ErrServerClosed {
 		log.Fatal(err)
 	}
 }

cmd/tailscale/cli/down.go

@@ -56,6 +56,7 @@ func runDown(ctx context.Context, args []string) error {
 			}
 			return
 		}
+		log.Printf("Notify: %#v", n)
 	})
 
 	bc.RequestStatus()

cmd/tailscale/cli/up.go

@@ -7,7 +7,6 @@ package cli
 import (
 	"bytes"
 	"context"
-	"errors"
 	"flag"
 	"fmt"
 	"log"
@@ -24,10 +23,18 @@ import (
 	"tailscale.com/ipn"
 	"tailscale.com/tailcfg"
 	"tailscale.com/version"
-	"tailscale.com/version/distro"
 	"tailscale.com/wgengine/router"
 )
 
+// globalStateKey is the ipn.StateKey that tailscaled loads on
+// startup.
+//
+// We have to support multiple state keys for other OSes (Windows in
+// particular), but right now Unix daemons run with a single
+// node-global state. To keep open the option of having per-user state
+// later, the global state key doesn't look like a username.
+const globalStateKey = "_daemon"
+
 var upCmd = &ffcli.Command{
 	Name:       "up",
 	ShortUsage: "up [flags]",
@@ -51,25 +58,19 @@ specify any flags, options are reset to their default.
 		upf.StringVar(&upArgs.advertiseTags, "advertise-tags", "", "ACL tags to request (comma-separated, e.g. eng,montreal,ssh)")
 		upf.StringVar(&upArgs.authKey, "authkey", "", "node authorization key")
 		upf.StringVar(&upArgs.hostname, "hostname", "", "hostname to use instead of the one provided by the OS")
+		upf.BoolVar(&upArgs.enableDERP, "enable-derp", true, "enable the use of DERP servers")
 		if runtime.GOOS == "linux" || isBSD(runtime.GOOS) || version.OS() == "macOS" {
 			upf.StringVar(&upArgs.advertiseRoutes, "advertise-routes", "", "routes to advertise to other nodes (comma-separated, e.g. 10.0.0.0/8,192.168.0.0/24)")
 		}
 		if runtime.GOOS == "linux" {
-			upf.BoolVar(&upArgs.snat, "snat-subnet-routes", true, "source NAT traffic to local routes advertised with --advertise-routes")
-			upf.StringVar(&upArgs.netfilterMode, "netfilter-mode", defaultNetfilterMode(), "netfilter mode (one of on, nodivert, off)")
+			upf.BoolVar(&upArgs.snat, "snat-subnet-routes", true, "source NAT traffic to local routes advertised with -advertise-routes")
+			upf.StringVar(&upArgs.netfilterMode, "netfilter-mode", "on", "netfilter mode (one of on, nodivert, off)")
 		}
 		return upf
 	})(),
 	Exec: runUp,
 }
 
-func defaultNetfilterMode() string {
-	if distro.Get() == distro.Synology {
-		return "off"
-	}
-	return "on"
-}
-
 var upArgs struct {
 	server          string
 	acceptRoutes    bool
@@ -79,6 +80,7 @@ var upArgs struct {
 	forceReauth     bool
 	advertiseRoutes string
 	advertiseTags   string
+	enableDERP      bool
 	snat            bool
 	netfilterMode   string
 	authKey         string
@@ -149,19 +151,6 @@ func runUp(ctx context.Context, args []string) error {
 		log.Fatalf("too many non-flag arguments: %q", args)
 	}
 
-	if distro.Get() == distro.Synology {
-		notSupported := "not yet supported on Synology; see https://github.com/tailscale/tailscale/issues/451"
-		if upArgs.advertiseRoutes != "" {
-			return errors.New("--advertise-routes is " + notSupported)
-		}
-		if upArgs.acceptRoutes {
-			return errors.New("--accept-routes is " + notSupported)
-		}
-		if upArgs.netfilterMode != "off" {
-			return errors.New("--netfilter-mode values besides \"off\" " + notSupported)
-		}
-	}
-
 	var routes []wgcfg.CIDR
 	if upArgs.advertiseRoutes != "" {
 		advroutes := strings.Split(upArgs.advertiseRoutes, ",")
@@ -182,19 +171,11 @@ func runUp(ctx context.Context, args []string) error {
 	var tags []string
 	if upArgs.advertiseTags != "" {
 		tags = strings.Split(upArgs.advertiseTags, ",")
-		for i, tag := range tags {
-			if strings.HasPrefix(tag, "tag:") {
-				// Accept fully-qualified tags (starting with
-				// "tag:"), as we do in the ACL file.
-				if err := tailcfg.CheckTag(tag); err != nil {
-					fatalf("tag: %q: %v", tag, err)
-				}
-				continue
+		for _, tag := range tags {
+			err := tailcfg.CheckTag(tag)
+			if err != nil {
+				fatalf("tag: %q: %s", tag, err)
 			}
-			if err := tailcfg.CheckTagSuffix(tag); err != nil {
-				fatalf("tag: %q: %v", tag, err)
-			}
-			tags[i] = "tag:" + tag
 		}
 	}
 
@@ -213,9 +194,8 @@ func runUp(ctx context.Context, args []string) error {
 	prefs.AdvertiseRoutes = routes
 	prefs.AdvertiseTags = tags
 	prefs.NoSNAT = !upArgs.snat
+	prefs.DisableDERP = !upArgs.enableDERP
 	prefs.Hostname = upArgs.hostname
-	prefs.ForceDaemon = (runtime.GOOS == "windows")
-
 	if runtime.GOOS == "linux" {
 		switch upArgs.netfilterMode {
 		case "on":
@@ -239,9 +219,8 @@ func runUp(ctx context.Context, args []string) error {
 	startLoginInteractive := func() { loginOnce.Do(func() { bc.StartLoginInteractive() }) }
 
 	bc.SetPrefs(prefs)
-
 	opts := ipn.Options{
-		StateKey: ipn.GlobalDaemonStateKey,
+		StateKey: globalStateKey,
 		AuthKey:  upArgs.authKey,
 		Notify: func(n ipn.Notify) {
 			if n.ErrMessage != nil {
@@ -269,22 +248,6 @@ func runUp(ctx context.Context, args []string) error {
 			}
 		},
 	}
-
-	// On Windows, we still run in mostly the "legacy" way that
-	// predated the server's StateStore. That is, we send an empty
-	// StateKey and send the prefs directly. Although the Windows
-	// supports server mode, though, the transition to StateStore
-	// is only half complete. Only server mode uses it, and the
-	// Windows service (~tailscaled) is the one that computes the
-	// StateKey based on the connection idenity. So for now, just
-	// do as the Windows GUI's always done:
-	if runtime.GOOS == "windows" {
-		// The Windows service will set this as needed based
-		// on our connection's identity.
-		opts.StateKey = ""
-		opts.Prefs = prefs
-	}
-
 	// We still have to Start right now because it's the only way to
 	// set up notifications and whatnot. This causes a bunch of churn
 	// every time the CLI touches anything.

cmd/tailscale/cli/version.go

@@ -36,11 +36,10 @@ func runVersion(ctx context.Context, args []string) error {
 		log.Fatalf("too many non-flag arguments: %q", args)
 	}
 	if !versionArgs.daemon {
-		fmt.Println(version.String())
+		fmt.Println(version.LONG)
 		return nil
 	}
-
-	fmt.Printf("Client: %s\n", version.String())
+	fmt.Printf("Client: %s\n", version.LONG)
 
 	c, bc, ctx, cancel := connect(ctx)
 	defer cancel()

cmd/tailscale/depaware.txt

@@ -1,210 +0,0 @@
-tailscale.com/cmd/tailscale dependencies: (generated by github.com/tailscale/depaware)
-
-   W 💣 github.com/alexbrainman/sspi                                 from github.com/alexbrainman/sspi/negotiate
-   W 💣 github.com/alexbrainman/sspi/negotiate                       from tailscale.com/net/tshttpproxy
-        github.com/apenwarr/fixconsole                               from tailscale.com/cmd/tailscale
-   W 💣 github.com/apenwarr/w32                                      from github.com/apenwarr/fixconsole
-   L    github.com/coreos/go-iptables/iptables                       from tailscale.com/wgengine/router
-  LW    github.com/go-multierror/multierror                          from tailscale.com/wgengine/router
-   W 💣 github.com/go-ole/go-ole                                     from github.com/go-ole/go-ole/oleutil+
-   W 💣 github.com/go-ole/go-ole/oleutil                             from tailscale.com/wgengine/winnet
-   L 💣 github.com/godbus/dbus/v5                                    from tailscale.com/wgengine/router/dns
-        github.com/golang/groupcache/lru                             from tailscale.com/wgengine/filter+
-   L    github.com/jsimonetti/rtnetlink                              from tailscale.com/wgengine/monitor
-   L    github.com/jsimonetti/rtnetlink/internal/unix                from github.com/jsimonetti/rtnetlink
-   L 💣 github.com/mdlayher/netlink                                  from github.com/jsimonetti/rtnetlink+
-   L 💣 github.com/mdlayher/netlink/nlenc                            from github.com/jsimonetti/rtnetlink+
-        github.com/peterbourgon/ff/v2                                from github.com/peterbourgon/ff/v2/ffcli
-        github.com/peterbourgon/ff/v2/ffcli                          from tailscale.com/cmd/tailscale/cli
-     💣 github.com/tailscale/wireguard-go/conn                       from github.com/tailscale/wireguard-go/device+
-     💣 github.com/tailscale/wireguard-go/device                     from tailscale.com/wgengine+
-        github.com/tailscale/wireguard-go/device/tokenbucket         from github.com/tailscale/wireguard-go/device
-     💣 github.com/tailscale/wireguard-go/ipc                        from github.com/tailscale/wireguard-go/device
-   W 💣 github.com/tailscale/wireguard-go/ipc/winpipe                from github.com/tailscale/wireguard-go/ipc
-        github.com/tailscale/wireguard-go/ratelimiter                from github.com/tailscale/wireguard-go/device
-        github.com/tailscale/wireguard-go/replay                     from github.com/tailscale/wireguard-go/device
-        github.com/tailscale/wireguard-go/rwcancel                   from github.com/tailscale/wireguard-go/device+
-        github.com/tailscale/wireguard-go/tai64n                     from github.com/tailscale/wireguard-go/device
-     💣 github.com/tailscale/wireguard-go/tun                        from github.com/tailscale/wireguard-go/device+
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun                 from github.com/tailscale/wireguard-go/tun
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun/iphlpapi        from github.com/tailscale/wireguard-go/tun/wintun
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun/namespaceapi    from github.com/tailscale/wireguard-go/tun/wintun
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun/nci             from github.com/tailscale/wireguard-go/tun/wintun
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun/registry        from github.com/tailscale/wireguard-go/tun/wintun
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun/setupapi        from github.com/tailscale/wireguard-go/tun/wintun
-        github.com/tailscale/wireguard-go/wgcfg                      from github.com/tailscale/wireguard-go/conn+
-        github.com/tcnksm/go-httpstat                                from tailscale.com/net/netcheck
-        github.com/toqueteos/webbrowser                              from tailscale.com/cmd/tailscale/cli
-     💣 go4.org/mem                                                  from tailscale.com/control/controlclient+
-   W 💣 golang.zx2c4.com/wireguard/windows/tunnel/winipcfg           from tailscale.com/net/interfaces+
-        inet.af/netaddr                                              from tailscale.com/cmd/tailscale/cli+
-        rsc.io/goversion/version                                     from tailscale.com/version
-        tailscale.com/atomicfile                                     from tailscale.com/ipn+
-        tailscale.com/cmd/tailscale/cli                              from tailscale.com/cmd/tailscale
-        tailscale.com/control/controlclient                          from tailscale.com/ipn+
-        tailscale.com/derp                                           from tailscale.com/derp/derphttp+
-        tailscale.com/derp/derphttp                                  from tailscale.com/cmd/tailscale/cli+
-        tailscale.com/derp/derpmap                                   from tailscale.com/cmd/tailscale/cli
-        tailscale.com/disco                                          from tailscale.com/derp+
-        tailscale.com/internal/deepprint                             from tailscale.com/ipn+
-        tailscale.com/ipn                                            from tailscale.com/cmd/tailscale/cli
-        tailscale.com/ipn/ipnstate                                   from tailscale.com/cmd/tailscale/cli+
-        tailscale.com/ipn/policy                                     from tailscale.com/ipn
-        tailscale.com/log/logheap                                    from tailscale.com/control/controlclient
-        tailscale.com/logtail/backoff                                from tailscale.com/control/controlclient+
-        tailscale.com/metrics                                        from tailscale.com/derp
-        tailscale.com/net/dnscache                                   from tailscale.com/cmd/tailscale/cli+
-     💣 tailscale.com/net/interfaces                                 from tailscale.com/cmd/tailscale/cli+
-        tailscale.com/net/netcheck                                   from tailscale.com/cmd/tailscale/cli+
-     💣 tailscale.com/net/netns                                      from tailscale.com/control/controlclient+
-        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/tshttpproxy                                from tailscale.com/cmd/tailscale/cli+
-        tailscale.com/paths                                          from tailscale.com/cmd/tailscale/cli
-        tailscale.com/portlist                                       from tailscale.com/ipn
-        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+
-  DW    tailscale.com/tempfork/osexec                                from tailscale.com/portlist
-   W    tailscale.com/tsconst                                        from tailscale.com/net/interfaces
-        tailscale.com/types/empty                                    from tailscale.com/control/controlclient+
-        tailscale.com/types/key                                      from tailscale.com/cmd/tailscale/cli+
-        tailscale.com/types/logger                                   from tailscale.com/cmd/tailscale/cli+
-        tailscale.com/types/nettype                                  from tailscale.com/wgengine/magicsock
-        tailscale.com/types/opt                                      from tailscale.com/control/controlclient+
-        tailscale.com/types/strbuilder                               from tailscale.com/wgengine/packet
-        tailscale.com/types/structs                                  from tailscale.com/control/controlclient+
-        tailscale.com/util/lineread                                  from tailscale.com/control/controlclient+
-        tailscale.com/version                                        from tailscale.com/cmd/tailscale/cli+
-        tailscale.com/version/distro                                 from tailscale.com/cmd/tailscale/cli+
-        tailscale.com/wgengine                                       from tailscale.com/ipn
-        tailscale.com/wgengine/filter                                from tailscale.com/control/controlclient+
-        tailscale.com/wgengine/magicsock                             from tailscale.com/wgengine
-     💣 tailscale.com/wgengine/monitor                               from tailscale.com/cmd/tailscale/cli+
-        tailscale.com/wgengine/packet                                from tailscale.com/wgengine+
-        tailscale.com/wgengine/router                                from tailscale.com/cmd/tailscale/cli+
-     💣 tailscale.com/wgengine/router/dns                            from tailscale.com/ipn+
-        tailscale.com/wgengine/tsdns                                 from tailscale.com/ipn+
-        tailscale.com/wgengine/tstun                                 from tailscale.com/wgengine
-   W 💣 tailscale.com/wgengine/winnet                                from tailscale.com/wgengine/router
-        golang.org/x/crypto/blake2b                                  from golang.org/x/crypto/nacl/box
-        golang.org/x/crypto/blake2s                                  from github.com/tailscale/wireguard-go/device+
-        golang.org/x/crypto/chacha20                                 from golang.org/x/crypto/chacha20poly1305
-        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/nacl/box                                 from tailscale.com/control/controlclient+
-        golang.org/x/crypto/nacl/secretbox                           from golang.org/x/crypto/nacl/box
-        golang.org/x/crypto/poly1305                                 from github.com/tailscale/wireguard-go/device+
-        golang.org/x/crypto/salsa20/salsa                            from golang.org/x/crypto/nacl/box+
-        golang.org/x/net/bpf                                         from github.com/mdlayher/netlink+
-        golang.org/x/net/context/ctxhttp                             from golang.org/x/oauth2/internal
-        golang.org/x/net/dns/dnsmessage                              from net+
-        golang.org/x/net/http/httpguts                               from net/http
-        golang.org/x/net/http/httpproxy                              from net/http
-        golang.org/x/net/http2/hpack                                 from net/http
-        golang.org/x/net/idna                                        from golang.org/x/net/http/httpguts+
-        golang.org/x/net/ipv4                                        from github.com/tailscale/wireguard-go/device
-        golang.org/x/net/ipv6                                        from github.com/tailscale/wireguard-go/device+
-        golang.org/x/net/proxy                                       from tailscale.com/net/netns
-   D    golang.org/x/net/route                                       from net
-        golang.org/x/oauth2                                          from tailscale.com/control/controlclient+
-        golang.org/x/oauth2/internal                                 from golang.org/x/oauth2
-        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 github.com/jsimonetti/rtnetlink/internal/unix+
-   W    golang.org/x/sys/windows                                     from github.com/apenwarr/fixconsole+
-   W    golang.org/x/sys/windows/registry                            from github.com/tailscale/wireguard-go/tun/wintun+
-        golang.org/x/text/secure/bidirule                            from golang.org/x/net/idna
-        golang.org/x/text/transform                                  from golang.org/x/text/secure/bidirule+
-        golang.org/x/text/unicode/bidi                               from golang.org/x/net/idna+
-        golang.org/x/text/unicode/norm                               from github.com/tailscale/wireguard-go/tun/wintun+
-        golang.org/x/time/rate                                       from tailscale.com/types/logger+
-        bufio                                                        from compress/flate+
-        bytes                                                        from bufio+
-        compress/flate                                               from compress/gzip+
-        compress/gzip                                                from net/http+
-        compress/zlib                                                from debug/elf+
-        container/list                                               from crypto/tls+
-        context                                                      from crypto/tls+
-        crypto                                                       from crypto/ecdsa+
-        crypto/aes                                                   from crypto/ecdsa+
-        crypto/cipher                                                from crypto/aes+
-        crypto/des                                                   from crypto/tls+
-        crypto/dsa                                                   from crypto/x509
-        crypto/ecdsa                                                 from crypto/tls+
-        crypto/ed25519                                               from crypto/tls+
-        crypto/elliptic                                              from crypto/ecdsa+
-        crypto/hmac                                                  from crypto/tls+
-        crypto/md5                                                   from crypto/tls+
-        crypto/rand                                                  from crypto/ed25519+
-        crypto/rc4                                                   from crypto/tls
-        crypto/rsa                                                   from crypto/tls+
-        crypto/sha1                                                  from crypto/tls+
-        crypto/sha256                                                from crypto/tls+
-        crypto/sha512                                                from crypto/ecdsa+
-        crypto/subtle                                                from crypto/aes+
-        crypto/tls                                                   from github.com/tcnksm/go-httpstat+
-        crypto/x509                                                  from crypto/tls+
-        crypto/x509/pkix                                             from crypto/x509+
-        debug/dwarf                                                  from debug/elf+
-        debug/elf                                                    from rsc.io/goversion/version
-        debug/macho                                                  from rsc.io/goversion/version
-        debug/pe                                                     from rsc.io/goversion/version
-        encoding                                                     from encoding/json+
-        encoding/asn1                                                from crypto/x509+
-        encoding/base64                                              from encoding/json+
-        encoding/binary                                              from compress/gzip+
-        encoding/hex                                                 from crypto/x509+
-        encoding/json                                                from expvar+
-        encoding/pem                                                 from crypto/tls+
-        errors                                                       from bufio+
-        expvar                                                       from tailscale.com/derp+
-        flag                                                         from github.com/peterbourgon/ff/v2+
-        fmt                                                          from compress/flate+
-        hash                                                         from compress/zlib+
-        hash/adler32                                                 from compress/zlib
-        hash/crc32                                                   from compress/gzip+
-        hash/fnv                                                     from tailscale.com/wgengine/magicsock
-        html                                                         from tailscale.com/ipn/ipnstate
-        io                                                           from bufio+
-        io/ioutil                                                    from crypto/tls+
-        log                                                          from expvar+
-        math                                                         from compress/flate+
-        math/big                                                     from crypto/dsa+
-        math/bits                                                    from compress/flate+
-        math/rand                                                    from github.com/mdlayher/netlink+
-        mime                                                         from golang.org/x/oauth2/internal+
-        mime/multipart                                               from net/http
-        mime/quotedprintable                                         from mime/multipart
-        net                                                          from crypto/tls+
-        net/http                                                     from expvar+
-        net/http/httptrace                                           from github.com/tcnksm/go-httpstat+
-        net/http/internal                                            from net/http
-        net/textproto                                                from golang.org/x/net/http/httpguts+
-        net/url                                                      from crypto/x509+
-        os                                                           from crypto/rand+
-        os/exec                                                      from github.com/coreos/go-iptables/iptables+
-        os/signal                                                    from tailscale.com/cmd/tailscale/cli
-   L    os/user                                                      from github.com/godbus/dbus/v5
-        path                                                         from debug/dwarf+
-        path/filepath                                                from crypto/x509+
-        reflect                                                      from crypto/x509+
-        regexp                                                       from github.com/coreos/go-iptables/iptables+
-        regexp/syntax                                                from regexp
-        runtime/pprof                                                from tailscale.com/log/logheap+
-        sort                                                         from compress/flate+
-        strconv                                                      from compress/flate+
-        strings                                                      from bufio+
-        sync                                                         from compress/flate+
-        sync/atomic                                                  from context+
-        syscall                                                      from crypto/rand+
-        text/tabwriter                                               from github.com/peterbourgon/ff/v2/ffcli+
-        time                                                         from compress/gzip+
-        unicode                                                      from bytes+
-        unicode/utf16                                                from encoding/asn1+
-        unicode/utf8                                                 from bufio+

cmd/tailscaled/depaware.txt

@@ -1,226 +0,0 @@
-tailscale.com/cmd/tailscaled dependencies: (generated by github.com/tailscale/depaware)
-
-   W 💣 github.com/alexbrainman/sspi                                 from github.com/alexbrainman/sspi/negotiate
-   W 💣 github.com/alexbrainman/sspi/negotiate                       from tailscale.com/net/tshttpproxy
-        github.com/apenwarr/fixconsole                               from tailscale.com/cmd/tailscaled
-   W 💣 github.com/apenwarr/w32                                      from github.com/apenwarr/fixconsole
-   L    github.com/coreos/go-iptables/iptables                       from tailscale.com/wgengine/router
-  LW    github.com/go-multierror/multierror                          from tailscale.com/wgengine/router
-   W 💣 github.com/go-ole/go-ole                                     from github.com/go-ole/go-ole/oleutil+
-   W 💣 github.com/go-ole/go-ole/oleutil                             from tailscale.com/wgengine/winnet
-   L 💣 github.com/godbus/dbus/v5                                    from tailscale.com/wgengine/router/dns
-        github.com/golang/groupcache/lru                             from tailscale.com/wgengine/filter+
-   L    github.com/jsimonetti/rtnetlink                              from tailscale.com/wgengine/monitor
-   L    github.com/jsimonetti/rtnetlink/internal/unix                from github.com/jsimonetti/rtnetlink
-        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/snappy                         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
-   L 💣 github.com/mdlayher/netlink                                  from github.com/jsimonetti/rtnetlink+
-   L 💣 github.com/mdlayher/netlink/nlenc                            from github.com/jsimonetti/rtnetlink+
-     💣 github.com/tailscale/wireguard-go/conn                       from github.com/tailscale/wireguard-go/device+
-     💣 github.com/tailscale/wireguard-go/device                     from tailscale.com/wgengine+
-        github.com/tailscale/wireguard-go/device/tokenbucket         from github.com/tailscale/wireguard-go/device
-     💣 github.com/tailscale/wireguard-go/ipc                        from github.com/tailscale/wireguard-go/device
-   W 💣 github.com/tailscale/wireguard-go/ipc/winpipe                from github.com/tailscale/wireguard-go/ipc
-        github.com/tailscale/wireguard-go/ratelimiter                from github.com/tailscale/wireguard-go/device
-        github.com/tailscale/wireguard-go/replay                     from github.com/tailscale/wireguard-go/device
-        github.com/tailscale/wireguard-go/rwcancel                   from github.com/tailscale/wireguard-go/device+
-        github.com/tailscale/wireguard-go/tai64n                     from github.com/tailscale/wireguard-go/device
-     💣 github.com/tailscale/wireguard-go/tun                        from github.com/tailscale/wireguard-go/device+
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun                 from github.com/tailscale/wireguard-go/tun
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun/iphlpapi        from github.com/tailscale/wireguard-go/tun/wintun
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun/namespaceapi    from github.com/tailscale/wireguard-go/tun/wintun
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun/nci             from github.com/tailscale/wireguard-go/tun/wintun
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun/registry        from github.com/tailscale/wireguard-go/tun/wintun
-   W 💣 github.com/tailscale/wireguard-go/tun/wintun/setupapi        from github.com/tailscale/wireguard-go/tun/wintun
-        github.com/tailscale/wireguard-go/wgcfg                      from github.com/tailscale/wireguard-go/conn+
-        github.com/tcnksm/go-httpstat                                from tailscale.com/net/netcheck
-     💣 go4.org/mem                                                  from tailscale.com/control/controlclient+
-   W 💣 golang.zx2c4.com/wireguard/windows/tunnel/winipcfg           from tailscale.com/net/interfaces+
-        inet.af/netaddr                                              from tailscale.com/control/controlclient+
-        rsc.io/goversion/version                                     from tailscale.com/version
-        tailscale.com/atomicfile                                     from tailscale.com/ipn+
-        tailscale.com/control/controlclient                          from tailscale.com/ipn+
-        tailscale.com/derp                                           from tailscale.com/derp/derphttp+
-        tailscale.com/derp/derphttp                                  from tailscale.com/net/netcheck+
-        tailscale.com/disco                                          from tailscale.com/derp+
-        tailscale.com/internal/deepprint                             from tailscale.com/ipn+
-        tailscale.com/ipn                                            from tailscale.com/ipn/ipnserver
-        tailscale.com/ipn/ipnserver                                  from tailscale.com/cmd/tailscaled
-        tailscale.com/ipn/ipnstate                                   from tailscale.com/ipn+
-        tailscale.com/ipn/policy                                     from tailscale.com/ipn
-        tailscale.com/log/filelogger                                 from tailscale.com/ipn/ipnserver
-        tailscale.com/log/logheap                                    from tailscale.com/control/controlclient
-        tailscale.com/logpolicy                                      from tailscale.com/cmd/tailscaled
-        tailscale.com/logtail                                        from tailscale.com/logpolicy
-        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/dnscache                                   from tailscale.com/derp/derphttp+
-     💣 tailscale.com/net/interfaces                                 from tailscale.com/ipn+
-        tailscale.com/net/netcheck                                   from tailscale.com/wgengine/magicsock
-     💣 tailscale.com/net/netns                                      from tailscale.com/control/controlclient+
-     💣 tailscale.com/net/netstat                                    from tailscale.com/ipn/ipnserver
-        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/tshttpproxy                                from tailscale.com/control/controlclient+
-        tailscale.com/paths                                          from tailscale.com/cmd/tailscaled+
-        tailscale.com/portlist                                       from tailscale.com/ipn
-        tailscale.com/safesocket                                     from tailscale.com/ipn/ipnserver
-        tailscale.com/smallzstd                                      from tailscale.com/ipn/ipnserver+
-     💣 tailscale.com/syncs                                          from tailscale.com/net/interfaces+
-        tailscale.com/tailcfg                                        from tailscale.com/control/controlclient+
-  DW    tailscale.com/tempfork/osexec                                from tailscale.com/portlist
-   W    tailscale.com/tsconst                                        from tailscale.com/net/interfaces
-        tailscale.com/types/empty                                    from tailscale.com/control/controlclient+
-        tailscale.com/types/flagtype                                 from tailscale.com/cmd/tailscaled
-        tailscale.com/types/key                                      from tailscale.com/derp+
-        tailscale.com/types/logger                                   from tailscale.com/cmd/tailscaled+
-        tailscale.com/types/nettype                                  from tailscale.com/wgengine/magicsock
-        tailscale.com/types/opt                                      from tailscale.com/control/controlclient+
-        tailscale.com/types/strbuilder                               from tailscale.com/wgengine/packet
-        tailscale.com/types/structs                                  from tailscale.com/control/controlclient+
-        tailscale.com/util/lineread                                  from tailscale.com/control/controlclient+
-        tailscale.com/util/pidowner                                  from tailscale.com/ipn/ipnserver
-        tailscale.com/version                                        from tailscale.com/cmd/tailscaled+
-        tailscale.com/version/distro                                 from tailscale.com/control/controlclient+
-        tailscale.com/wgengine                                       from tailscale.com/cmd/tailscaled+
-        tailscale.com/wgengine/filter                                from tailscale.com/control/controlclient+
-        tailscale.com/wgengine/magicsock                             from tailscale.com/cmd/tailscaled+
-     💣 tailscale.com/wgengine/monitor                               from tailscale.com/wgengine
-        tailscale.com/wgengine/packet                                from tailscale.com/wgengine+
-        tailscale.com/wgengine/router                                from tailscale.com/cmd/tailscaled+
-     💣 tailscale.com/wgengine/router/dns                            from tailscale.com/ipn+
-        tailscale.com/wgengine/tsdns                                 from tailscale.com/ipn+
-        tailscale.com/wgengine/tstun                                 from tailscale.com/wgengine
-   W 💣 tailscale.com/wgengine/winnet                                from tailscale.com/wgengine/router
-        golang.org/x/crypto/blake2b                                  from golang.org/x/crypto/nacl/box
-        golang.org/x/crypto/blake2s                                  from github.com/tailscale/wireguard-go/device+
-        golang.org/x/crypto/chacha20                                 from golang.org/x/crypto/chacha20poly1305
-        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/nacl/box                                 from tailscale.com/control/controlclient+
-        golang.org/x/crypto/nacl/secretbox                           from golang.org/x/crypto/nacl/box
-        golang.org/x/crypto/poly1305                                 from github.com/tailscale/wireguard-go/device+
-        golang.org/x/crypto/salsa20/salsa                            from golang.org/x/crypto/nacl/box+
-        golang.org/x/crypto/ssh/terminal                             from tailscale.com/logpolicy
-        golang.org/x/net/bpf                                         from github.com/mdlayher/netlink+
-        golang.org/x/net/context/ctxhttp                             from golang.org/x/oauth2/internal
-        golang.org/x/net/dns/dnsmessage                              from net+
-        golang.org/x/net/http/httpguts                               from net/http
-        golang.org/x/net/http/httpproxy                              from net/http
-        golang.org/x/net/http2/hpack                                 from net/http
-        golang.org/x/net/idna                                        from golang.org/x/net/http/httpguts+
-        golang.org/x/net/ipv4                                        from github.com/tailscale/wireguard-go/device
-        golang.org/x/net/ipv6                                        from github.com/tailscale/wireguard-go/device+
-        golang.org/x/net/proxy                                       from tailscale.com/net/netns
-   D    golang.org/x/net/route                                       from net
-        golang.org/x/oauth2                                          from tailscale.com/control/controlclient+
-        golang.org/x/oauth2/internal                                 from golang.org/x/oauth2
-        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 github.com/jsimonetti/rtnetlink/internal/unix+
-   W    golang.org/x/sys/windows                                     from github.com/apenwarr/fixconsole+
-   W    golang.org/x/sys/windows/registry                            from github.com/tailscale/wireguard-go/tun/wintun+
-        golang.org/x/text/secure/bidirule                            from golang.org/x/net/idna
-        golang.org/x/text/transform                                  from golang.org/x/text/secure/bidirule+
-        golang.org/x/text/unicode/bidi                               from golang.org/x/net/idna+
-        golang.org/x/text/unicode/norm                               from github.com/tailscale/wireguard-go/tun/wintun+
-        golang.org/x/time/rate                                       from tailscale.com/types/logger+
-        bufio                                                        from compress/flate+
-        bytes                                                        from bufio+
-        compress/flate                                               from compress/gzip+
-        compress/gzip                                                from internal/profile+
-        compress/zlib                                                from debug/elf+
-        container/list                                               from crypto/tls+
-        context                                                      from crypto/tls+
-        crypto                                                       from crypto/ecdsa+
-        crypto/aes                                                   from crypto/ecdsa+
-        crypto/cipher                                                from crypto/aes+
-        crypto/des                                                   from crypto/tls+
-        crypto/dsa                                                   from crypto/x509
-        crypto/ecdsa                                                 from crypto/tls+
-        crypto/ed25519                                               from crypto/tls+
-        crypto/elliptic                                              from crypto/ecdsa+
-        crypto/hmac                                                  from crypto/tls+
-        crypto/md5                                                   from crypto/tls+
-        crypto/rand                                                  from crypto/ed25519+
-        crypto/rc4                                                   from crypto/tls
-        crypto/rsa                                                   from crypto/tls+
-        crypto/sha1                                                  from crypto/tls+
-        crypto/sha256                                                from crypto/tls+
-        crypto/sha512                                                from crypto/ecdsa+
-        crypto/subtle                                                from crypto/aes+
-        crypto/tls                                                   from github.com/tcnksm/go-httpstat+
-        crypto/x509                                                  from crypto/tls+
-        crypto/x509/pkix                                             from crypto/x509+
-        debug/dwarf                                                  from debug/elf+
-        debug/elf                                                    from rsc.io/goversion/version
-        debug/macho                                                  from rsc.io/goversion/version
-        debug/pe                                                     from rsc.io/goversion/version
-        encoding                                                     from encoding/json+
-        encoding/asn1                                                from crypto/x509+
-        encoding/base64                                              from encoding/json+
-        encoding/binary                                              from compress/gzip+
-        encoding/hex                                                 from crypto/x509+
-        encoding/json                                                from expvar+
-        encoding/pem                                                 from crypto/tls+
-        errors                                                       from bufio+
-        expvar                                                       from tailscale.com/derp+
-        flag                                                         from tailscale.com/cmd/tailscaled+
-        fmt                                                          from compress/flate+
-        hash                                                         from compress/zlib+
-        hash/adler32                                                 from compress/zlib
-        hash/crc32                                                   from compress/gzip+
-        hash/fnv                                                     from tailscale.com/wgengine/magicsock
-        html                                                         from html/template+
-        html/template                                                from net/http/pprof
-        io                                                           from bufio+
-        io/ioutil                                                    from crypto/tls+
-        log                                                          from expvar+
-        math                                                         from compress/flate+
-        math/big                                                     from crypto/dsa+
-        math/bits                                                    from compress/flate+
-        math/rand                                                    from github.com/mdlayher/netlink+
-        mime                                                         from golang.org/x/oauth2/internal+
-        mime/multipart                                               from net/http
-        mime/quotedprintable                                         from mime/multipart
-        net                                                          from crypto/tls+
-        net/http                                                     from expvar+
-        net/http/httptrace                                           from github.com/tcnksm/go-httpstat+
-        net/http/internal                                            from net/http
-        net/http/pprof                                               from tailscale.com/cmd/tailscaled
-        net/textproto                                                from golang.org/x/net/http/httpguts+
-        net/url                                                      from crypto/x509+
-        os                                                           from crypto/rand+
-        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 debug/dwarf+
-        path/filepath                                                from crypto/x509+
-        reflect                                                      from crypto/x509+
-        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/trace                                                from net/http/pprof
-        sort                                                         from compress/flate+
-        strconv                                                      from compress/flate+
-        strings                                                      from bufio+
-        sync                                                         from compress/flate+
-        sync/atomic                                                  from context+
-        syscall                                                      from crypto/rand+
-        text/tabwriter                                               from runtime/pprof
-        text/template                                                from html/template
-        text/template/parse                                          from html/template+
-        time                                                         from compress/gzip+
-        unicode                                                      from bytes+
-        unicode/utf16                                                from encoding/asn1+
-        unicode/utf8                                                 from bufio+

cmd/tailscaled/tailscaled.go

@@ -11,8 +11,6 @@ package main // import "tailscale.com/cmd/tailscaled"
 
 import (
 	"context"
-	"flag"
-	"fmt"
 	"log"
 	"net/http"
 	"net/http/pprof"
@@ -20,19 +18,18 @@ import (
 	"os/signal"
 	"runtime"
 	"runtime/debug"
-	"strconv"
 	"syscall"
 	"time"
 
 	"github.com/apenwarr/fixconsole"
+	"github.com/pborman/getopt/v2"
 	"tailscale.com/ipn/ipnserver"
 	"tailscale.com/logpolicy"
 	"tailscale.com/paths"
-	"tailscale.com/types/flagtype"
 	"tailscale.com/types/logger"
-	"tailscale.com/version"
 	"tailscale.com/wgengine"
 	"tailscale.com/wgengine/magicsock"
+	"tailscale.com/wgengine/netstack"
 	"tailscale.com/wgengine/router"
 )
 
@@ -75,29 +72,28 @@ func main() {
 		debug.SetGCPercent(10)
 	}
 
-	printVersion := false
-	flag.BoolVar(&args.cleanup, "cleanup", false, "clean up system state and exit")
-	flag.BoolVar(&args.fake, "fake", false, "use userspace fake tunnel+routing instead of kernel TUN interface")
-	flag.StringVar(&args.debug, "debug", "", "listen address ([ip]:port) of optional debug server")
-	flag.StringVar(&args.tunname, "tun", defaultTunName(), "tunnel interface name")
-	flag.Var(flagtype.PortValue(&args.port, magicsock.DefaultPort), "port", "UDP port to listen on for WireGuard and peer-to-peer traffic; 0 means automatically select")
-	flag.StringVar(&args.statepath, "state", paths.DefaultTailscaledStateFile(), "path of state file")
-	flag.StringVar(&args.socketpath, "socket", paths.DefaultTailscaledSocket(), "path of the service unix socket")
-	flag.BoolVar(&printVersion, "version", false, "print version information and exit")
+	// Set default values for getopt.
+	args.tunname = defaultTunName()
+	args.port = magicsock.DefaultPort
+	args.statepath = paths.DefaultTailscaledStateFile()
+	args.socketpath = paths.DefaultTailscaledSocket()
+
+	getopt.FlagLong(&args.cleanup, "cleanup", 0, "clean up system state and exit")
+	getopt.FlagLong(&args.fake, "fake", 0, "fake tunnel+routing instead of tuntap")
+	getopt.FlagLong(&args.debug, "debug", 0, "address of debug server")
+	getopt.FlagLong(&args.tunname, "tun", 0, "tunnel interface name")
+	getopt.FlagLong(&args.port, "port", 'p', "WireGuard port (0=autoselect)")
+	getopt.FlagLong(&args.statepath, "state", 0, "path of state file")
+	getopt.FlagLong(&args.socketpath, "socket", 's', "path of the service unix socket")
 
 	err := fixconsole.FixConsoleIfNeeded()
 	if err != nil {
 		log.Fatalf("fixConsoleOutput: %v", err)
 	}
 
-	flag.Parse()
-	if flag.NArg() > 0 {
-		log.Fatalf("tailscaled does not take non-flag arguments: %q", flag.Args())
-	}
-
-	if printVersion {
-		fmt.Println(version.String())
-		os.Exit(0)
+	getopt.Parse()
+	if len(getopt.Args()) > 0 {
+		log.Fatalf("too many non-flag arguments: %#v", getopt.Args()[0])
 	}
 
 	if args.statepath == "" {
@@ -125,10 +121,7 @@ func run() error {
 		pol.Shutdown(ctx)
 	}()
 
-	var logf logger.Logf = log.Printf
-	if v, _ := strconv.ParseBool(os.Getenv("TS_DEBUG_MEMORY")); v {
-		logf = logger.RusagePrefixLog(logf)
-	}
+	logf := wgengine.RusagePrefixLog(log.Printf)
 	logf = logger.RateLimitedFn(logf, 5*time.Second, 5, 100)
 
 	if args.cleanup {
@@ -144,7 +137,11 @@ func run() error {
 
 	var e wgengine.Engine
 	if args.fake {
-		e, err = wgengine.NewFakeUserspaceEngine(logf, args.port)
+		impl := netstack.Impl
+		if args.tunname != "netstack" {
+			impl = nil
+		}
+		e, err = wgengine.NewFakeUserspaceEngine(logf, 0, impl)
 	} else {
 		e, err = wgengine.NewUserspaceEngine(logf, args.tunname, args.port)
 	}

control/controlclient/auto.go

@@ -288,7 +288,7 @@ func (c *Client) authRoutine() {
 			// don't send status updates for context errors,
 			// since context cancelation is always on purpose.
 			if ctx.Err() == nil {
-				c.sendStatus("authRoutine-report", err, "", nil)
+				c.sendStatus("authRoutine1", err, "", nil)
 			}
 		}
 
@@ -353,7 +353,7 @@ func (c *Client) authRoutine() {
 			c.synced = false
 			c.mu.Unlock()
 
-			c.sendStatus("authRoutine-wantout", nil, "", nil)
+			c.sendStatus("authRoutine2", nil, "", nil)
 			bo.BackOff(ctx, nil)
 		} else { // ie. goal.wantLoggedIn
 			c.mu.Lock()
@@ -394,7 +394,7 @@ func (c *Client) authRoutine() {
 				c.synced = false
 				c.mu.Unlock()
 
-				c.sendStatus("authRoutine-url", err, url, nil)
+				c.sendStatus("authRoutine3", err, url, nil)
 				bo.BackOff(ctx, err)
 				continue
 			}
@@ -406,7 +406,7 @@ func (c *Client) authRoutine() {
 			c.state = StateAuthenticated
 			c.mu.Unlock()
 
-			c.sendStatus("authRoutine-success", nil, "", nil)
+			c.sendStatus("authRoutine4", nil, "", nil)
 			c.cancelMapSafely()
 			bo.BackOff(ctx, nil)
 		}
@@ -528,7 +528,7 @@ func (c *Client) mapRoutine() {
 
 				c.logf("mapRoutine: netmap received: %s", state)
 				if stillAuthed {
-					c.sendStatus("mapRoutine-got-netmap", nil, "", nm)
+					c.sendStatus("mapRoutine2", nil, "", nm)
 				}
 			})
 

control/controlclient/direct.go

@@ -13,7 +13,6 @@ import (
 	"encoding/binary"
 	"encoding/json"
 	"errors"
-	"flag"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -21,7 +20,6 @@ import (
 	"net/http"
 	"net/url"
 	"os"
-	"os/exec"
 	"reflect"
 	"runtime"
 	"sort"
@@ -47,19 +45,8 @@ import (
 )
 
 type Persist struct {
-	_ structs.Incomparable
-
-	// LegacyFrontendPrivateMachineKey is here temporarily
-	// (starting 2020-09-28) during migration of Windows users'
-	// machine keys from frontend storage to the backend. On the
-	// first LocalBackend.Start call, the backend will initialize
-	// the real (backend-owned) machine key from the frontend's
-	// provided value (if non-zero), picking a new random one if
-	// needed. This field should be considered read-only from GUI
-	// frontends. The real value should not be written back in
-	// this field, lest the frontend persist it to disk.
-	LegacyFrontendPrivateMachineKey wgcfg.PrivateKey `json:"PrivateMachineKey"`
-
+	_                 structs.Incomparable
+	PrivateMachineKey wgcfg.PrivateKey
 	PrivateNodeKey    wgcfg.PrivateKey
 	OldPrivateNodeKey wgcfg.PrivateKey // needed to request key rotation
 	Provider          string
@@ -74,7 +61,7 @@ func (p *Persist) Equals(p2 *Persist) bool {
 		return false
 	}
 
-	return p.LegacyFrontendPrivateMachineKey.Equal(p2.LegacyFrontendPrivateMachineKey) &&
+	return p.PrivateMachineKey.Equal(p2.PrivateMachineKey) &&
 		p.PrivateNodeKey.Equal(p2.PrivateNodeKey) &&
 		p.OldPrivateNodeKey.Equal(p2.OldPrivateNodeKey) &&
 		p.Provider == p2.Provider &&
@@ -83,8 +70,8 @@ func (p *Persist) Equals(p2 *Persist) bool {
 
 func (p *Persist) Pretty() string {
 	var mk, ok, nk wgcfg.Key
-	if !p.LegacyFrontendPrivateMachineKey.IsZero() {
-		mk = p.LegacyFrontendPrivateMachineKey.Public()
+	if !p.PrivateMachineKey.IsZero() {
+		mk = p.PrivateMachineKey.Public()
 	}
 	if !p.OldPrivateNodeKey.IsZero() {
 		ok = p.OldPrivateNodeKey.Public()
@@ -92,14 +79,9 @@ func (p *Persist) Pretty() string {
 	if !p.PrivateNodeKey.IsZero() {
 		nk = p.PrivateNodeKey.Public()
 	}
-	ss := func(k wgcfg.Key) string {
-		if k.IsZero() {
-			return ""
-		}
-		return k.ShortString()
-	}
-	return fmt.Sprintf("Persist{lm=%v, o=%v, n=%v u=%#v}",
-		ss(mk), ss(ok), ss(nk), p.LoginName)
+	return fmt.Sprintf("Persist{m=%v, o=%v, n=%v u=%#v}",
+		mk.ShortString(), ok.ShortString(), nk.ShortString(),
+		p.LoginName)
 }
 
 // Direct is the client that connects to a tailcontrol server for a node.
@@ -112,8 +94,6 @@ type Direct struct {
 	keepAlive       bool
 	logf            logger.Logf
 	discoPubKey     tailcfg.DiscoKey
-	machinePrivKey  wgcfg.PrivateKey
-	debugFlags      []string
 
 	mu           sync.Mutex // mutex guards the following fields
 	serverKey    wgcfg.Key
@@ -122,25 +102,22 @@ type Direct struct {
 	tryingNewKey wgcfg.PrivateKey
 	expiry       *time.Time
 	// hostinfo is mutated in-place while mu is held.
-	hostinfo      *tailcfg.Hostinfo // always non-nil
-	endpoints     []string
-	everEndpoints bool   // whether we've ever had non-empty endpoints
-	localPort     uint16 // or zero to mean auto
+	hostinfo  *tailcfg.Hostinfo // always non-nil
+	endpoints []string
+	localPort uint16 // or zero to mean auto
 }
 
 type Options struct {
-	Persist           Persist           // initial persistent data
-	MachinePrivateKey wgcfg.PrivateKey  // the machine key to use
-	ServerURL         string            // URL of the tailcontrol server
-	AuthKey           string            // optional node auth key for auto registration
-	TimeNow           func() time.Time  // time.Now implementation used by Client
-	Hostinfo          *tailcfg.Hostinfo // non-nil passes ownership, nil means to use default using os.Hostname, etc
-	DiscoPublicKey    tailcfg.DiscoKey
-	NewDecompressor   func() (Decompressor, error)
-	KeepAlive         bool
-	Logf              logger.Logf
-	HTTPTestClient    *http.Client // optional HTTP client to use (for tests only)
-	DebugFlags        []string     // debug settings to send to control
+	Persist         Persist           // initial persistent data
+	ServerURL       string            // URL of the tailcontrol server
+	AuthKey         string            // optional node auth key for auto registration
+	TimeNow         func() time.Time  // time.Now implementation used by Client
+	Hostinfo        *tailcfg.Hostinfo // non-nil passes ownership, nil means to use default using os.Hostname, etc
+	DiscoPublicKey  tailcfg.DiscoKey
+	NewDecompressor func() (Decompressor, error)
+	KeepAlive       bool
+	Logf            logger.Logf
+	HTTPTestClient  *http.Client // optional HTTP client to use (for tests only)
 }
 
 type Decompressor interface {
@@ -153,9 +130,6 @@ func NewDirect(opts Options) (*Direct, error) {
 	if opts.ServerURL == "" {
 		return nil, errors.New("controlclient.New: no server URL specified")
 	}
-	if opts.MachinePrivateKey.IsZero() {
-		return nil, errors.New("controlclient.New: no MachinePrivateKey specified")
-	}
 	opts.ServerURL = strings.TrimRight(opts.ServerURL, "/")
 	serverURL, err := url.Parse(opts.ServerURL)
 	if err != nil {
@@ -184,7 +158,6 @@ func NewDirect(opts Options) (*Direct, error) {
 
 	c := &Direct{
 		httpc:           httpc,
-		machinePrivKey:  opts.MachinePrivateKey,
 		serverURL:       opts.ServerURL,
 		timeNow:         opts.TimeNow,
 		logf:            opts.Logf,
@@ -193,7 +166,6 @@ func NewDirect(opts Options) (*Direct, error) {
 		persist:         opts.Persist,
 		authKey:         opts.AuthKey,
 		discoPubKey:     opts.DiscoPublicKey,
-		debugFlags:      opts.DebugFlags,
 	}
 	if opts.Hostinfo == nil {
 		c.SetHostinfo(NewHostinfo())
@@ -212,7 +184,7 @@ func NewHostinfo() *tailcfg.Hostinfo {
 		osv = osVersion()
 	}
 	return &tailcfg.Hostinfo{
-		IPNVersion: version.Long,
+		IPNVersion: version.LONG,
 		Hostname:   hostname,
 		OS:         version.OS(),
 		OSVersion:  osv,
@@ -233,8 +205,6 @@ func (c *Direct) SetHostinfo(hi *tailcfg.Hostinfo) bool {
 		return false
 	}
 	c.hostinfo = hi.Clone()
-	j, _ := json.Marshal(c.hostinfo)
-	c.logf("HostInfo: %s", j)
 	return true
 }
 
@@ -279,14 +249,16 @@ func (c *Direct) TryLogout(ctx context.Context) error {
 
 	// TODO(crawshaw): Tell the server. This node key should be
 	// immediately invalidated.
-	//if !c.persist.PrivateNodeKey.IsZero() {
+	//if c.persist.PrivateNodeKey != (wgcfg.PrivateKey{}) {
 	//}
-	c.persist = Persist{}
+	c.persist = Persist{
+		PrivateMachineKey: c.persist.PrivateMachineKey,
+	}
 	return nil
 }
 
 func (c *Direct) TryLogin(ctx context.Context, t *oauth2.Token, flags LoginFlags) (url string, err error) {
-	c.logf("direct.TryLogin(token=%v, flags=%v)", t != nil, flags)
+	c.logf("direct.TryLogin(%v, %v)", t != nil, flags)
 	return c.doLoginOrRegen(ctx, t, flags, false, "")
 }
 
@@ -317,8 +289,13 @@ func (c *Direct) doLogin(ctx context.Context, t *oauth2.Token, flags LoginFlags,
 	expired := c.expiry != nil && !c.expiry.IsZero() && c.expiry.Before(c.timeNow())
 	c.mu.Unlock()
 
-	if c.machinePrivKey.IsZero() {
-		return false, "", errors.New("controlclient.Direct requires a machine private key")
+	if persist.PrivateMachineKey == (wgcfg.PrivateKey{}) {
+		c.logf("Generating a new machinekey.")
+		mkey, err := wgcfg.NewPrivateKey()
+		if err != nil {
+			log.Fatal(err)
+		}
+		persist.PrivateMachineKey = mkey
 	}
 
 	if expired {
@@ -345,7 +322,7 @@ func (c *Direct) doLogin(ctx context.Context, t *oauth2.Token, flags LoginFlags,
 
 	var oldNodeKey wgcfg.Key
 	if url != "" {
-	} else if regen || persist.PrivateNodeKey.IsZero() {
+	} else if regen || persist.PrivateNodeKey == (wgcfg.PrivateKey{}) {
 		c.logf("Generating a new nodekey.")
 		persist.OldPrivateNodeKey = persist.PrivateNodeKey
 		key, err := wgcfg.NewPrivateKey()
@@ -358,11 +335,11 @@ func (c *Direct) doLogin(ctx context.Context, t *oauth2.Token, flags LoginFlags,
 		// Try refreshing the current key first
 		tryingNewKey = persist.PrivateNodeKey
 	}
-	if !persist.OldPrivateNodeKey.IsZero() {
+	if persist.OldPrivateNodeKey != (wgcfg.PrivateKey{}) {
 		oldNodeKey = persist.OldPrivateNodeKey.Public()
 	}
 
-	if tryingNewKey.IsZero() {
+	if tryingNewKey == (wgcfg.PrivateKey{}) {
 		log.Fatalf("tryingNewKey is empty, give up")
 	}
 	if backendLogID == "" {
@@ -383,13 +360,13 @@ func (c *Direct) doLogin(ctx context.Context, t *oauth2.Token, flags LoginFlags,
 	request.Auth.Provider = persist.Provider
 	request.Auth.LoginName = persist.LoginName
 	request.Auth.AuthKey = authKey
-	bodyData, err := encode(request, &serverKey, &c.machinePrivKey)
+	bodyData, err := encode(request, &serverKey, &persist.PrivateMachineKey)
 	if err != nil {
 		return regen, url, err
 	}
 	body := bytes.NewReader(bodyData)
 
-	u := fmt.Sprintf("%s/machine/%s", c.serverURL, c.machinePrivKey.Public().HexString())
+	u := fmt.Sprintf("%s/machine/%s", c.serverURL, persist.PrivateMachineKey.Public().HexString())
 	req, err := http.NewRequest("POST", u, body)
 	if err != nil {
 		return regen, url, err
@@ -400,20 +377,11 @@ func (c *Direct) doLogin(ctx context.Context, t *oauth2.Token, flags LoginFlags,
 	if err != nil {
 		return regen, url, fmt.Errorf("register request: %v", err)
 	}
-	if res.StatusCode != 200 {
-		msg, _ := ioutil.ReadAll(res.Body)
-		res.Body.Close()
-		return regen, url, fmt.Errorf("register request: http %d: %.200s",
-			res.StatusCode, strings.TrimSpace(string(msg)))
-	}
+	c.logf("RegisterReq: returned.")
 	resp := tailcfg.RegisterResponse{}
-	if err := decode(res, &resp, &serverKey, &c.machinePrivKey); err != nil {
-		c.logf("error decoding RegisterResponse with server key %s and machine key %s: %v", serverKey, c.machinePrivKey.Public(), err)
+	if err := decode(res, &resp, &serverKey, &persist.PrivateMachineKey); err != nil {
 		return regen, url, fmt.Errorf("register request: %v", err)
 	}
-	// Log without PII:
-	c.logf("RegisterReq: got response; nodeKeyExpired=%v, machineAuthorized=%v; authURL=%v",
-		resp.NodeKeyExpired, resp.MachineAuthorized, resp.AuthURL != "")
 
 	if resp.NodeKeyExpired {
 		if regen {
@@ -489,9 +457,6 @@ func (c *Direct) newEndpoints(localPort uint16, endpoints []string) (changed boo
 	c.logf("client.newEndpoints(%v, %v)", localPort, endpoints)
 	c.localPort = localPort
 	c.endpoints = append(c.endpoints[:0], endpoints...)
-	if len(endpoints) > 0 {
-		c.everEndpoints = true
-	}
 	return true // changed
 }
 
@@ -504,13 +469,6 @@ func (c *Direct) SetEndpoints(localPort uint16, endpoints []string) (changed boo
 	return c.newEndpoints(localPort, 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(*NetworkMap)) error {
 	c.mu.Lock()
 	persist := c.persist
@@ -520,7 +478,6 @@ func (c *Direct) PollNetMap(ctx context.Context, maxPolls int, cb func(*NetworkM
 	backendLogID := hostinfo.BackendLogID
 	localPort := c.localPort
 	ep := append([]string(nil), c.endpoints...)
-	everEndpoints := c.everEndpoints
 	c.mu.Unlock()
 
 	if backendLogID == "" {
@@ -528,7 +485,7 @@ func (c *Direct) PollNetMap(ctx context.Context, maxPolls int, cb func(*NetworkM
 	}
 
 	allowStream := maxPolls != 1
-	c.logf("PollNetMap: stream=%v :%v ep=%v", allowStream, localPort, ep)
+	c.logf("PollNetMap: stream=%v :%v %v", maxPolls, localPort, ep)
 
 	vlogf := logger.Discard
 	if Debug.NetMap {
@@ -536,51 +493,36 @@ func (c *Direct) PollNetMap(ctx context.Context, maxPolls int, cb func(*NetworkM
 	}
 
 	request := tailcfg.MapRequest{
-		Version:    5,
-		KeepAlive:  c.keepAlive,
-		NodeKey:    tailcfg.NodeKey(persist.PrivateNodeKey.Public()),
-		DiscoKey:   c.discoPubKey,
-		Endpoints:  ep,
-		Stream:     allowStream,
-		Hostinfo:   hostinfo,
-		DebugFlags: c.debugFlags,
-	}
-	if hostinfo != nil && ipForwardingBroken(hostinfo.RoutableIPs) {
-		old := request.DebugFlags
-		request.DebugFlags = append(old[:len(old):len(old)], "warn-ip-forwarding-off")
+		Version:         4,
+		IncludeIPv6:     true,
+		DeltaPeers:      true,
+		KeepAlive:       c.keepAlive,
+		NodeKey:         tailcfg.NodeKey(persist.PrivateNodeKey.Public()),
+		DiscoKey:        c.discoPubKey,
+		Endpoints:       ep,
+		Stream:          allowStream,
+		Hostinfo:        hostinfo,
+		DebugForceDisco: Debug.ForceDisco,
 	}
 	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(ep) == 0 && !everEndpoints && !inTest() {
-		request.ReadOnly = true
-	}
 
-	bodyData, err := encode(request, &serverKey, &c.machinePrivKey)
+	bodyData, err := encode(request, &serverKey, &persist.PrivateMachineKey)
 	if err != nil {
 		vlogf("netmap: encode: %v", err)
 		return err
 	}
 
-	ctx, cancel := context.WithCancel(ctx)
-	defer cancel()
-
-	machinePubKey := tailcfg.MachineKey(c.machinePrivKey.Public())
 	t0 := time.Now()
-	u := fmt.Sprintf("%s/machine/%s/map", serverURL, machinePubKey.HexString())
-
-	req, err := http.NewRequestWithContext(ctx, "POST", u, bytes.NewReader(bodyData))
+	u := fmt.Sprintf("%s/machine/%s/map", serverURL, persist.PrivateMachineKey.Public().HexString())
+	req, err := http.NewRequest("POST", u, bytes.NewReader(bodyData))
 	if err != nil {
 		return err
 	}
+	ctx, cancel := context.WithCancel(ctx)
+	defer cancel()
+	req = req.WithContext(ctx)
 
 	res, err := c.httpc.Do(req)
 	if err != nil {
@@ -591,7 +533,7 @@ func (c *Direct) PollNetMap(ctx context.Context, maxPolls int, cb func(*NetworkM
 	if res.StatusCode != 200 {
 		msg, _ := ioutil.ReadAll(res.Body)
 		res.Body.Close()
-		return fmt.Errorf("initial fetch failed %d: %.200s",
+		return fmt.Errorf("initial fetch failed %d: %s",
 			res.StatusCode, strings.TrimSpace(string(msg)))
 	}
 	defer res.Body.Close()
@@ -630,7 +572,6 @@ func (c *Direct) PollNetMap(ctx context.Context, maxPolls int, cb func(*NetworkM
 	}()
 
 	var lastDERPMap *tailcfg.DERPMap
-	var lastUserProfile = map[tailcfg.UserID]tailcfg.UserProfile{}
 
 	// If allowStream, then the server will use an HTTP long poll to
 	// return incremental results. There is always one response right
@@ -680,9 +621,6 @@ func (c *Direct) PollNetMap(ctx context.Context, maxPolls int, cb func(*NetworkM
 
 		undeltaPeers(&resp, previousPeers)
 		previousPeers = cloneNodes(resp.Peers) // defensive/lazy clone, since this escapes to who knows where
-		for _, up := range resp.UserProfiles {
-			lastUserProfile[up.ID] = up
-		}
 
 		if resp.DERPMap != nil {
 			vlogf("netmap: new map contains DERP map")
@@ -711,7 +649,6 @@ func (c *Direct) PollNetMap(ctx context.Context, maxPolls int, cb func(*NetworkM
 		nm := &NetworkMap{
 			NodeKey:      tailcfg.NodeKey(persist.PrivateNodeKey.Public()),
 			PrivateKey:   persist.PrivateNodeKey,
-			MachineKey:   machinePubKey,
 			Expiry:       resp.Node.KeyExpiry,
 			Name:         resp.Node.Name,
 			Addresses:    resp.Node.Addresses,
@@ -720,24 +657,15 @@ func (c *Direct) PollNetMap(ctx context.Context, maxPolls int, cb func(*NetworkM
 			User:         resp.Node.User,
 			UserProfiles: make(map[tailcfg.UserID]tailcfg.UserProfile),
 			Domain:       resp.Domain,
+			Roles:        resp.Roles,
 			DNS:          resp.DNSConfig,
 			Hostinfo:     resp.Node.Hostinfo,
 			PacketFilter: c.parsePacketFilter(resp.PacketFilter),
 			DERPMap:      lastDERPMap,
 			Debug:        resp.Debug,
 		}
-		addUserProfile := func(userID tailcfg.UserID) {
-			if _, dup := nm.UserProfiles[userID]; dup {
-				// Already populated it from a previous peer.
-				return
-			}
-			if up, ok := lastUserProfile[userID]; ok {
-				nm.UserProfiles[userID] = up
-			}
-		}
-		addUserProfile(nm.User)
-		for _, peer := range resp.Peers {
-			addUserProfile(peer.User)
+		for _, profile := range resp.UserProfiles {
+			nm.UserProfiles[profile.ID] = profile
 		}
 		if resp.Node.MachineAuthorized {
 			nm.MachineStatus = tailcfg.MachineAuthorized
@@ -789,14 +717,13 @@ func decode(res *http.Response, v interface{}, serverKey *wgcfg.Key, mkey *wgcfg
 	return decodeMsg(msg, v, serverKey, mkey)
 }
 
-var debugMap, _ = strconv.ParseBool(os.Getenv("TS_DEBUG_MAP"))
-
 func (c *Direct) decodeMsg(msg []byte, v interface{}) error {
 	c.mu.Lock()
+	mkey := c.persist.PrivateMachineKey
 	serverKey := c.serverKey
 	c.mu.Unlock()
 
-	decrypted, err := decryptMsg(msg, &serverKey, &c.machinePrivKey)
+	decrypted, err := decryptMsg(msg, &serverKey, &mkey)
 	if err != nil {
 		return err
 	}
@@ -814,11 +741,6 @@ func (c *Direct) decodeMsg(msg []byte, v interface{}) error {
 			return err
 		}
 	}
-	if debugMap {
-		var buf bytes.Buffer
-		json.Indent(&buf, b, "", "    ")
-		log.Printf("MapResponse: %s", buf.Bytes())
-	}
 	if err := json.Unmarshal(b, v); err != nil {
 		return fmt.Errorf("response: %v", err)
 	}
@@ -848,7 +770,7 @@ func decryptMsg(msg []byte, serverKey *wgcfg.Key, mkey *wgcfg.PrivateKey) ([]byt
 	pub, pri := (*[32]byte)(serverKey), (*[32]byte)(mkey)
 	decrypted, ok := box.Open(nil, msg, &nonce, pub, pri)
 	if !ok {
-		return nil, fmt.Errorf("cannot decrypt response (len %d + nonce %d = %d)", len(msg), len(nonce), len(msg)+len(nonce))
+		return nil, fmt.Errorf("cannot decrypt response")
 	}
 	return decrypted, nil
 }
@@ -858,7 +780,8 @@ func encode(v interface{}, serverKey *wgcfg.Key, mkey *wgcfg.PrivateKey) ([]byte
 	if err != nil {
 		return nil, err
 	}
-	if debugMap {
+	const debugMapRequests = false
+	if debugMapRequests {
 		if _, ok := v.(tailcfg.MapRequest); ok {
 			log.Printf("MapRequest: %s", b)
 		}
@@ -913,20 +836,25 @@ func wgIPToNetaddr(ips []wgcfg.IP) (ret []netaddr.IP) {
 var Debug = initDebug()
 
 type debug struct {
-	NetMap    bool
-	ProxyDNS  bool
-	OnlyDisco bool
-	Disco     bool
+	NetMap     bool
+	ProxyDNS   bool
+	OnlyDisco  bool
+	Disco      bool
+	ForceDisco bool // ask control server to not filter out our disco key
 }
 
 func initDebug() debug {
-	use := os.Getenv("TS_DEBUG_USE_DISCO")
-	return debug{
-		NetMap:    envBool("TS_DEBUG_NETMAP"),
-		ProxyDNS:  envBool("TS_DEBUG_PROXY_DNS"),
-		OnlyDisco: use == "only",
-		Disco:     use == "only" || use == "" || envBool("TS_DEBUG_USE_DISCO"),
+	d := debug{
+		NetMap:     envBool("TS_DEBUG_NETMAP"),
+		ProxyDNS:   envBool("TS_DEBUG_PROXY_DNS"),
+		OnlyDisco:  os.Getenv("TS_DEBUG_USE_DISCO") == "only",
+		ForceDisco: os.Getenv("TS_DEBUG_USE_DISCO") == "only" || envBool("TS_DEBUG_USE_DISCO"),
 	}
+	if d.ForceDisco || os.Getenv("TS_DEBUG_USE_DISCO") == "" {
+		// This is now defaults to on.
+		d.Disco = true
+	}
+	return d
 }
 
 func envBool(k string) bool {
@@ -1061,34 +989,3 @@ func TrimWGConfig() opt.Bool {
 	v, _ := controlTrimWGConfig.Load().(opt.Bool)
 	return v
 }
-
-// ipForwardingBroken reports whether the system's IP forwarding is disabled
-// and will definitely not work for the routes provided.
-//
-// It should not return false positives.
-func ipForwardingBroken(routes []wgcfg.CIDR) bool {
-	if len(routes) == 0 {
-		// Nothing to route, so no need to warn.
-		return false
-	}
-	if runtime.GOOS != "linux" {
-		// We only do subnet routing on Linux for now.
-		// It might work on darwin/macOS when building from source, so
-		// don't return true for other OSes. We can OS-based warnings
-		// already in the admin panel.
-		return false
-	}
-	out, err := ioutil.ReadFile("/proc/sys/net/ipv4/ip_forward")
-	if err != nil {
-		// Try another way.
-		out, err = exec.Command("sysctl", "-n", "net.ipv4.ip_forward").Output()
-	}
-	if err != nil {
-		// Oh well, we tried. This is just for debugging.
-		// We don't want false positives.
-		// TODO: maybe we want a different warning for inability to check?
-		return false
-	}
-	return strings.TrimSpace(string(out)) == "0"
-	// TODO: also check IPv6 if 'routes' contains any IPv6 routes
-}

control/controlclient/hostinfo_linux.go

@@ -16,7 +16,6 @@ import (
 
 	"go4.org/mem"
 	"tailscale.com/util/lineread"
-	"tailscale.com/version/distro"
 )
 
 func init() {
@@ -24,22 +23,13 @@ func init() {
 }
 
 func osVersionLinux() string {
-	dist := distro.Get()
-	propFile := "/etc/os-release"
-	switch dist {
-	case distro.Synology:
-		propFile = "/etc.defaults/VERSION"
-	case distro.OpenWrt:
-		propFile = "/etc/openwrt_release"
-	}
-
 	m := map[string]string{}
-	lineread.File(propFile, func(line []byte) error {
+	lineread.File("/etc/os-release", func(line []byte) error {
 		eq := bytes.IndexByte(line, '=')
 		if eq == -1 {
 			return nil
 		}
-		k, v := string(line[:eq]), strings.Trim(string(line[eq+1:]), `"'`)
+		k, v := string(line[:eq]), strings.Trim(string(line[eq+1:]), `"`)
 		m[k] = v
 		return nil
 	})
@@ -81,12 +71,6 @@ func osVersionLinux() string {
 			return fmt.Sprintf("%s%s", v, attr)
 		}
 	}
-	switch dist {
-	case distro.Synology:
-		return fmt.Sprintf("Synology %s%s", m["productversion"], attr)
-	case distro.OpenWrt:
-		return fmt.Sprintf("OpenWrt %s%s", m["DISTRIB_RELEASE"], attr)
-	}
 	return fmt.Sprintf("Other%s", attr)
 }
 

control/controlclient/hostinfo_windows.go

@@ -21,10 +21,6 @@ func osVersionWindows() string {
 	s := strings.TrimSpace(string(out))
 	s = strings.TrimPrefix(s, "Microsoft Windows [")
 	s = strings.TrimSuffix(s, "]")
-
-	// "Version 10.x.y.z", with "Version" localized. Keep only stuff after the space.
-	if sp := strings.Index(s, " "); sp != -1 {
-		s = s[sp+1:]
-	}
-	return s // "10.0.19041.388", ideally
+	s = strings.TrimPrefix(s, "Version ") // is this localized? do it last in case.
+	return s                              // "10.0.19041.388", ideally
 }

control/controlclient/netmap.go

@@ -30,7 +30,6 @@ type NetworkMap struct {
 	Addresses     []wgcfg.CIDR
 	LocalPort     uint16 // used for debugging
 	MachineStatus tailcfg.MachineStatus
-	MachineKey    tailcfg.MachineKey
 	Peers         []*tailcfg.Node // sorted by Node.ID
 	DNS           tailcfg.DNSConfig
 	Hostinfo      tailcfg.Hostinfo
@@ -50,6 +49,7 @@ type NetworkMap struct {
 	// TODO(crawshaw): reduce UserProfiles to []tailcfg.UserProfile?
 	// There are lots of ways to slice this data, leave it up to users.
 	UserProfiles map[tailcfg.UserID]tailcfg.UserProfile
+	Roles        []tailcfg.Role
 	// TODO(crawshaw): Groups       []tailcfg.Group
 	// TODO(crawshaw): Capabilities []tailcfg.Capability
 }
@@ -75,15 +75,6 @@ func (nm *NetworkMap) Concise() string {
 func (nm *NetworkMap) printConciseHeader(buf *strings.Builder) {
 	fmt.Fprintf(buf, "netmap: self: %v auth=%v",
 		nm.NodeKey.ShortString(), nm.MachineStatus)
-	login := nm.UserProfiles[nm.User].LoginName
-	if login == "" {
-		if nm.User.IsZero() {
-			login = "?"
-		} else {
-			login = fmt.Sprint(nm.User)
-		}
-	}
-	fmt.Fprintf(buf, " u=%s", login)
 	if nm.LocalPort != 0 {
 		fmt.Fprintf(buf, " port=%v", nm.LocalPort)
 	}
@@ -101,7 +92,6 @@ func (a *NetworkMap) equalConciseHeader(b *NetworkMap) bool {
 	if a.NodeKey != b.NodeKey ||
 		a.MachineStatus != b.MachineStatus ||
 		a.LocalPort != b.LocalPort ||
-		a.User != b.User ||
 		len(a.Addresses) != len(b.Addresses) {
 		return false
 	}
@@ -229,6 +219,7 @@ const (
 	AllowSingleHosts WGConfigFlags = 1 << iota
 	AllowSubnetRoutes
 	AllowDefaultRoute
+	HackDefaultRoute
 )
 
 // EndpointDiscoSuffix is appended to the hex representation of a peer's discovery key
@@ -283,7 +274,11 @@ func (nm *NetworkMap) WGCfg(logf logger.Logf, flags WGConfigFlags) (*wgcfg.Confi
 					logf("wgcfg: %v skipping default route", peer.Key.ShortString())
 					continue
 				}
-			} else if cidrIsSubnet(peer, allowedIP) {
+				if (flags & HackDefaultRoute) != 0 {
+					allowedIP = wgcfg.CIDR{IP: wgcfg.IPv4(10, 0, 0, 0), Mask: 8}
+					logf("wgcfg: %v converting default route => %v", peer.Key.ShortString(), allowedIP.String())
+				}
+			} else if allowedIP.Mask < 32 {
 				if (flags & AllowSubnetRoutes) == 0 {
 					logf("wgcfg: %v skipping subnet route", peer.Key.ShortString())
 					continue
@@ -296,29 +291,6 @@ func (nm *NetworkMap) WGCfg(logf logger.Logf, flags WGConfigFlags) (*wgcfg.Confi
 	return cfg, nil
 }
 
-// cidrIsSubnet reports whether cidr is a non-default-route subnet
-// exported by node that is not one of its own self addresses.
-func cidrIsSubnet(node *tailcfg.Node, cidr wgcfg.CIDR) bool {
-	if cidr.Mask == 0 {
-		return false
-	}
-	if cidr.Mask < 32 {
-		// Fast path for IPv4, to avoid loop below.
-		//
-		// TODO: if cidr.IP is an IPv6 address, we could do "< 128"
-		// to avoid the range over node.Addresses. Or we could
-		// just remove this fast path and unconditionally do the range
-		// loop.
-		return true
-	}
-	for _, selfCIDR := range node.Addresses {
-		if cidr == selfCIDR {
-			return false
-		}
-	}
-	return true
-}
-
 func appendEndpoint(peer *wgcfg.Peer, epStr string) error {
 	if epStr == "" {
 		return nil

control/controlclient/netmap_test.go

@@ -51,7 +51,7 @@ func TestNetworkMapConcise(t *testing.T) {
 					},
 				},
 			},
-			want: "netmap: self: [AQEBA] auth=machine-unknown u=? []\n [AgICA] D2                 :    192.168.0.100:12     192.168.0.100:12354\n [AwMDA] D4                 :       10.2.0.100:12        10.1.0.100:12345\n",
+			want: "netmap: self: [AQEBA] auth=machine-unknown []\n [AgICA] D2                 :    192.168.0.100:12     192.168.0.100:12354\n [AwMDA] D4                 :       10.2.0.100:12        10.1.0.100:12345\n",
 		},
 		{
 			name: "debug_non_nil",
@@ -59,7 +59,7 @@ func TestNetworkMapConcise(t *testing.T) {
 				NodeKey: testNodeKey(1),
 				Debug:   &tailcfg.Debug{},
 			},
-			want: "netmap: self: [AQEBA] auth=machine-unknown u=? debug={} []\n",
+			want: "netmap: self: [AQEBA] auth=machine-unknown debug={} []\n",
 		},
 		{
 			name: "debug_values",
@@ -67,7 +67,7 @@ func TestNetworkMapConcise(t *testing.T) {
 				NodeKey: testNodeKey(1),
 				Debug:   &tailcfg.Debug{LogHeapPprof: true},
 			},
-			want: "netmap: self: [AQEBA] auth=machine-unknown u=? debug={\"LogHeapPprof\":true} []\n",
+			want: "netmap: self: [AQEBA] auth=machine-unknown debug={\"LogHeapPprof\":true} []\n",
 		},
 	} {
 		t.Run(tt.name, func(t *testing.T) {
@@ -135,7 +135,7 @@ func TestConciseDiffFrom(t *testing.T) {
 					},
 				},
 			},
-			want: "-netmap: self: [AQEBA] auth=machine-unknown u=? []\n+netmap: self: [AgICA] auth=machine-unknown u=? []\n",
+			want: "-netmap: self: [AQEBA] auth=machine-unknown []\n+netmap: self: [AgICA] auth=machine-unknown []\n",
 		},
 		{
 			name: "peer_add",

control/controlclient/persist_test.go

@@ -12,7 +12,7 @@ import (
 )
 
 func TestPersistEqual(t *testing.T) {
-	persistHandles := []string{"LegacyFrontendPrivateMachineKey", "PrivateNodeKey", "OldPrivateNodeKey", "Provider", "LoginName"}
+	persistHandles := []string{"PrivateMachineKey", "PrivateNodeKey", "OldPrivateNodeKey", "Provider", "LoginName"}
 	if have := fieldsOf(reflect.TypeOf(Persist{})); !reflect.DeepEqual(have, persistHandles) {
 		t.Errorf("Persist.Equal check might be out of sync\nfields: %q\nhandled: %q\n",
 			have, persistHandles)
@@ -36,13 +36,13 @@ func TestPersistEqual(t *testing.T) {
 		{&Persist{}, &Persist{}, true},
 
 		{
-			&Persist{LegacyFrontendPrivateMachineKey: k1},
-			&Persist{LegacyFrontendPrivateMachineKey: newPrivate()},
+			&Persist{PrivateMachineKey: k1},
+			&Persist{PrivateMachineKey: newPrivate()},
 			false,
 		},
 		{
-			&Persist{LegacyFrontendPrivateMachineKey: k1},
-			&Persist{LegacyFrontendPrivateMachineKey: k1},
+			&Persist{PrivateMachineKey: k1},
+			&Persist{PrivateMachineKey: k1},
 			true,
 		},
 

derp/derp_server.go

@@ -1291,7 +1291,7 @@ func (s *Server) ExpVar() expvar.Var {
 	m.Set("multiforwarder_deleted", &s.multiForwarderDeleted)
 	m.Set("packet_forwarder_delete_other_value", &s.removePktForwardOther)
 	var expvarVersion expvar.String
-	expvarVersion.Set(version.Long)
+	expvarVersion.Set(version.LONG)
 	m.Set("version", &expvarVersion)
 	return m
 }

go.mod

@@ -9,32 +9,31 @@ require (
 	github.com/coreos/go-iptables v0.4.5
 	github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568 // indirect
 	github.com/gliderlabs/ssh v0.2.2
-	github.com/go-multierror/multierror v1.0.2
 	github.com/go-ole/go-ole v1.2.4
 	github.com/godbus/dbus/v5 v5.0.3
 	github.com/golang/groupcache v0.0.0-20200121045136-8c9f03a8e57e
-	github.com/google/go-cmp v0.4.0
+	github.com/google/go-cmp v0.5.0
 	github.com/goreleaser/nfpm v1.1.10
 	github.com/jsimonetti/rtnetlink v0.0.0-20200117123717-f846d4f6c1f4
 	github.com/klauspost/compress v1.10.10
-	github.com/kr/pty v1.1.1
+	github.com/kr/pty v1.1.4-0.20190131011033-7dc38fb350b1
 	github.com/mdlayher/netlink v1.1.0
 	github.com/miekg/dns v1.1.30
 	github.com/pborman/getopt v0.0.0-20190409184431-ee0cd42419d3
 	github.com/peterbourgon/ff/v2 v2.0.0
-	github.com/tailscale/depaware v0.0.0-20201003033024-5d95aab075be
-	github.com/tailscale/wireguard-go v0.0.0-20201021041318-a6168fd06b3f
+	github.com/tailscale/winipcfg-go v0.0.0-20200413171540-609dcf2df55f
+	github.com/tailscale/wireguard-go v0.0.0-20200902185615-1997cf6f9fe4
 	github.com/tcnksm/go-httpstat v0.2.0
 	github.com/toqueteos/webbrowser v1.2.0
 	go4.org/mem v0.0.0-20200706164138-185c595c3ecc
-	golang.org/x/crypto v0.0.0-20200709230013-948cd5f35899
-	golang.org/x/net v0.0.0-20200822124328-c89045814202
+	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
+	golang.org/x/net v0.0.0-20200625001655-4c5254603344
 	golang.org/x/oauth2 v0.0.0-20200107190931-bf48bf16ab8d
 	golang.org/x/sync v0.0.0-20200625203802-6e8e738ad208
 	golang.org/x/sys v0.0.0-20200812155832-6a926be9bd1d
 	golang.org/x/time v0.0.0-20191024005414-555d28b269f0
-	golang.org/x/tools v0.0.0-20201002184944-ecd9fd270d5d
-	golang.zx2c4.com/wireguard/windows v0.1.2-0.20201004085714-dd60d0447f81
+	golang.org/x/tools v0.0.0-20200707200213-416e8f4faf8a
+	gvisor.dev/gvisor v0.0.0-20200903175658-a842a338ecd9
 	honnef.co/go/tools v0.0.1-2020.1.4
 	inet.af/netaddr v0.0.0-20200810144936-56928fe48a98
 	rsc.io/goversion v1.2.0

go.sum

@@ -1,10 +1,29 @@
+bazil.org/fuse v0.0.0-20160811212531-371fbbdaa898/go.mod h1:Xbm+BRKSBEpa4q4hTSxohYNQpsxXPbPry4JJWOB3LB8=
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
 cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.52.1-0.20200122224058-0482b626c726/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/Masterminds/semver/v3 v3.0.3 h1:znjIyLfpXEDQjOIEWh+ehwpTU14UzUPub3c3sm36u14=
 github.com/Masterminds/semver/v3 v3.0.3/go.mod h1:VPu/7SZ7ePZ3QOrcuXROw5FAcLl4a0cBrbBpGY/8hQs=
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internal/tooldeps/tooldeps.go

@@ -1,9 +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.
-
-package tooldeps
-
-import (
-	_ "github.com/tailscale/depaware/depaware"
-)

ipn/backend.go

@@ -21,7 +21,6 @@ type State int
 
 const (
 	NoState = State(iota)
-	InUseOtherUser
 	NeedsLogin
 	NeedsMachineAuth
 	Stopped
@@ -34,14 +33,8 @@ const (
 const GoogleIDTokenType = "ts_android_google_login"
 
 func (s State) String() string {
-	return [...]string{
-		"NoState",
-		"InUseOtherUser",
-		"NeedsLogin",
-		"NeedsMachineAuth",
-		"Stopped",
-		"Starting",
-		"Running"}[s]
+	return [...]string{"NoState", "NeedsLogin", "NeedsMachineAuth",
+		"Stopped", "Starting", "Running"}[s]
 }
 
 // EngineStatus contains WireGuard engine stats.
@@ -60,7 +53,7 @@ type EngineStatus struct {
 type Notify struct {
 	_             structs.Incomparable
 	Version       string                    // version number of IPN backend
-	ErrMessage    *string                   // critical error message, if any; for InUseOtherUser, the details
+	ErrMessage    *string                   // critical error message, if any
 	LoginFinished *empty.Message            // event: non-nil when login process succeeded
 	State         *State                    // current IPN state has changed
 	Prefs         *Prefs                    // preferences were changed
@@ -88,14 +81,14 @@ type Notify struct {
 // shared by several consecutive users. Ideally we would just use the
 // username of the connected frontend as the StateKey.
 //
-// Various platforms currently set StateKey in different ways:
-//
-// * the macOS/iOS GUI apps set it to "ipn-go-bridge"
-// * the Android app sets it to "ipn-android"
-// * on Windows, it's the empty string (in client mode) or, via
-//   LocalBackend.userID, a string like "user-$USER_ID" (used in
-//   server mode).
-// * on Linux/etc, it's always "_daemon" (ipn.GlobalDaemonStateKey)
+// However, on Windows, there seems to be no safe way to figure out
+// the owning user of a process connected over IPC mechanisms
+// (sockets, named pipes). So instead, on Windows, we use a
+// capability-oriented system where the frontend generates a random
+// identifier for itself, and uses that as the StateKey when talking
+// to the backend. That way, while we can't identify an OS user by
+// name, we can tell two different users apart, because they'll have
+// different opaque state keys (and no access to each others's keys).
 type StateKey string
 
 type Options struct {
@@ -104,8 +97,7 @@ type Options struct {
 	// StateKey and Prefs together define the state the backend should
 	// use:
 	//  - StateKey=="" && Prefs!=nil: use Prefs for internal state,
-	//    don't persist changes in the backend, except for the machine key
-	//    for migration purposes.
+	//    don't persist changes in the backend.
 	//  - StateKey!="" && Prefs==nil: load the given backend-side
 	//    state and use/update that.
 	//  - StateKey!="" && Prefs!=nil: like the previous case, but do

ipn/ipnserver/server.go

@@ -7,33 +7,23 @@ package ipnserver
 import (
 	"bufio"
 	"context"
-	"errors"
 	"fmt"
-	"io"
-	"io/ioutil"
 	"log"
 	"net"
 	"net/http"
 	"os"
 	"os/exec"
 	"os/signal"
-	"os/user"
-	"runtime"
-	"strings"
 	"sync"
 	"syscall"
 	"time"
 
-	"inet.af/netaddr"
 	"tailscale.com/control/controlclient"
 	"tailscale.com/ipn"
-	"tailscale.com/log/filelogger"
 	"tailscale.com/logtail/backoff"
-	"tailscale.com/net/netstat"
 	"tailscale.com/safesocket"
 	"tailscale.com/smallzstd"
 	"tailscale.com/types/logger"
-	"tailscale.com/util/pidowner"
 	"tailscale.com/version"
 	"tailscale.com/wgengine"
 )
@@ -71,12 +61,6 @@ type Options struct {
 	// its existing state, and accepts new frontend connections. If
 	// false, the server dumps its state and becomes idle.
 	//
-	// This is effectively whether the platform is in "server
-	// mode" by default. On Linux, it's true; on Windows, it's
-	// false. But on some platforms (currently only Windows), the
-	// "server mode" can be overridden at runtime with a change in
-	// Prefs.ForceDaemon/WantRunning.
-	//
 	// To support CLI connections (notably, "tailscale status"),
 	// the actual definition of "disconnect" is when the
 	// connection count transitions from 1 to 0.
@@ -90,185 +74,21 @@ type Options struct {
 // server is an IPN backend and its set of 0 or more active connections
 // talking to an IPN backend.
 type server struct {
-	b    *ipn.LocalBackend
-	logf logger.Logf
-	// resetOnZero is whether to call bs.Reset on transition from
-	// 1->0 connections.  That is, this is whether the backend is
-	// being run in "client mode" that requires an active GUI
-	// connection (such as on Windows by default).  Even if this
-	// is true, the ForceDaemon pref can override this.
-	resetOnZero bool
+	resetOnZero bool // call bs.Reset on transition from 1->0 connections
 
 	bsMu sync.Mutex // lock order: bsMu, then mu
 	bs   *ipn.BackendServer
 
-	mu             sync.Mutex
-	serverModeUser *user.User                   // or nil if not in server mode
-	lastUserID     string                       // tracks last userid; on change, Reset state for paranoia
-	allClients     map[net.Conn]connIdentity    // HTTP or IPN
-	clients        map[net.Conn]bool            // subset of allClients; only IPN protocol
-	disconnectSub  map[chan<- struct{}]struct{} // keys are subscribers of disconnects
-}
-
-// connIdentity represents the owner of a localhost TCP connection.
-type connIdentity struct {
-	Unknown bool
-	Pid     int
-	UserID  string
-	User    *user.User
-}
-
-// getConnIdentity returns the localhost TCP connection's identity information
-// (pid, userid, user). If it's not Windows (for now), it returns a nil error
-// and a ConnIdentity with Unknown set true. It's only an error if we expected
-// to be able to map it and couldn't.
-func (s *server) getConnIdentity(c net.Conn) (ci connIdentity, err error) {
-	if runtime.GOOS != "windows" { // for now; TODO: expand to other OSes
-		return connIdentity{Unknown: true}, nil
-	}
-	la, err := netaddr.ParseIPPort(c.LocalAddr().String())
-	if err != nil {
-		return ci, fmt.Errorf("parsing local address: %w", err)
-	}
-	ra, err := netaddr.ParseIPPort(c.RemoteAddr().String())
-	if err != nil {
-		return ci, fmt.Errorf("parsing local remote: %w", err)
-	}
-	if !la.IP.IsLoopback() || !ra.IP.IsLoopback() {
-		return ci, errors.New("non-loopback connection")
-	}
-	tab, err := netstat.Get()
-	if err != nil {
-		return ci, fmt.Errorf("failed to get local connection table: %w", err)
-	}
-	pid := peerPid(tab.Entries, la, ra)
-	if pid == 0 {
-		return ci, errors.New("no local process found matching localhost connection")
-	}
-	ci.Pid = pid
-	uid, err := pidowner.OwnerOfPID(pid)
-	if err != nil {
-		var hint string
-		if runtime.GOOS == "windows" {
-			hint = " (WSL?)"
-		}
-		return ci, fmt.Errorf("failed to map connection's pid to a user%s: %w", hint, err)
-	}
-	ci.UserID = uid
-	u, err := s.lookupUserFromID(uid)
-	if err != nil {
-		return ci, fmt.Errorf("failed to look up user from userid: %w", err)
-	}
-	ci.User = u
-	return ci, nil
-}
-
-func (s *server) lookupUserFromID(uid string) (*user.User, error) {
-	u, err := user.LookupId(uid)
-	if err != nil && runtime.GOOS == "windows" && errors.Is(err, syscall.Errno(0x534)) {
-		s.logf("[warning] issue 869: os/user.LookupId failed; ignoring")
-		// Work around https://github.com/tailscale/tailscale/issues/869 for
-		// now. We don't strictly need the username. It's just a nice-to-have.
-		// So make up a *user.User if their machine is broken in this way.
-		return &user.User{
-			Uid:      uid,
-			Username: "unknown-user-" + uid,
-			Name:     "unknown user " + uid,
-		}, nil
-	}
-	return u, err
-}
-
-// blockWhileInUse blocks while until either a Read from conn fails
-// (i.e. it's closed) or until the server is able to accept ci as a
-// user.
-func (s *server) blockWhileInUse(conn io.Reader, ci connIdentity) {
-	s.logf("blocking client while server in use; connIdentity=%v", ci)
-	connDone := make(chan struct{})
-	go func() {
-		io.Copy(ioutil.Discard, conn)
-		close(connDone)
-	}()
-	ch := make(chan struct{}, 1)
-	s.registerDisconnectSub(ch, true)
-	defer s.registerDisconnectSub(ch, false)
-	for {
-		select {
-		case <-connDone:
-			s.logf("blocked client Read completed; connIdentity=%v", ci)
-			return
-		case <-ch:
-			s.mu.Lock()
-			err := s.checkConnIdentityLocked(ci)
-			s.mu.Unlock()
-			if err == nil {
-				s.logf("unblocking client, server is free; connIdentity=%v", ci)
-				// Server is now available again for a new user.
-				// TODO(bradfitz): keep this connection alive. But for
-				// now just return and have our caller close the connection
-				// (which unblocks the io.Copy goroutine we started above)
-				// and then the client (e.g. Windows) will reconnect and
-				// discover that it works.
-				return
-			}
-		}
-	}
+	mu      sync.Mutex
+	clients map[net.Conn]bool
 }
 
 func (s *server) serveConn(ctx context.Context, c net.Conn, logf logger.Logf) {
-	// First see if it's an HTTP request.
-	br := bufio.NewReader(c)
-	c.SetReadDeadline(time.Now().Add(time.Second))
-	peek, _ := br.Peek(4)
-	c.SetReadDeadline(time.Time{})
-	isHTTPReq := string(peek) == "GET "
-
-	ci, err := s.addConn(c, isHTTPReq)
-	if err != nil {
-		if isHTTPReq {
-			fmt.Fprintf(c, "HTTP/1.0 500 Nope\r\nContent-Type: text/plain\r\nX-Content-Type-Options: nosniff\r\n\r\n%s\n", err.Error())
-			c.Close()
-			return
-		}
-		defer c.Close()
-		serverToClient := func(b []byte) { ipn.WriteMsg(c, b) }
-		bs := ipn.NewBackendServer(logf, nil, serverToClient)
-		_, occupied := err.(inUseOtherUserError)
-		if occupied {
-			bs.SendInUseOtherUserErrorMessage(err.Error())
-			s.blockWhileInUse(c, ci)
-		} else {
-			bs.SendErrorMessage(err.Error())
-			time.Sleep(time.Second)
-		}
-		return
-	}
-
-	// Tell the LocalBackend about the identity we're now running as.
-	s.b.SetCurrentUserID(ci.UserID)
-
-	if isHTTPReq {
-		httpServer := http.Server{
-			// Localhost connections are cheap; so only do
-			// keep-alives for a short period of time, as these
-			// active connections lock the server into only serving
-			// that user. If the user has this page open, we don't
-			// want another switching user to be locked out for
-			// minutes. 5 seconds is enough to let browser hit
-			// favicon.ico and such.
-			IdleTimeout: 5 * time.Second,
-			ErrorLog:    logger.StdLogger(logf),
-			Handler:     s.localhostHandler(ci),
-		}
-		httpServer.Serve(&oneConnListener{&protoSwitchConn{s: s, br: br, Conn: c}})
-		return
-	}
-
-	defer s.removeAndCloseConn(c)
+	s.addConn(c)
 	logf("incoming control connection")
-
+	defer s.removeAndCloseConn(c)
 	for ctx.Err() == nil {
-		msg, err := ipn.ReadMsg(br)
+		msg, err := ipn.ReadMsg(c)
 		if err != nil {
 			if ctx.Err() == nil {
 				logf("ReadMsg: %v", err)
@@ -287,126 +107,25 @@ func (s *server) serveConn(ctx context.Context, c net.Conn, logf logger.Logf) {
 	}
 }
 
-// inUseOtherUserError is the error type for when the server is in use
-// by a different local user.
-type inUseOtherUserError struct{ error }
-
-func (e inUseOtherUserError) Unwrap() error { return e.error }
-
-// checkConnIdentityLocked checks whether the provided identity is
-// allowed to connect to the server.
-//
-// The returned error, when non-nil, will be of type inUseOtherUserError.
-//
-// s.mu must be held.
-func (s *server) checkConnIdentityLocked(ci connIdentity) error {
-	// If clients are already connected, verify they're the same user.
-	// This mostly matters on Windows at the moment.
-	if len(s.allClients) > 0 {
-		var active connIdentity
-		for _, active = range s.allClients {
-			break
-		}
-		if ci.UserID != active.UserID {
-			//lint:ignore ST1005 we want to capitalize Tailscale here
-			return inUseOtherUserError{fmt.Errorf("Tailscale already in use by %s, pid %d", active.User.Username, active.Pid)}
-		}
-	}
-	if su := s.serverModeUser; su != nil && ci.UserID != su.Uid {
-		//lint:ignore ST1005 we want to capitalize Tailscale here
-		return inUseOtherUserError{fmt.Errorf("Tailscale already in use by %s", su.Username)}
-	}
-	return nil
-}
-
-// registerDisconnectSub adds ch as a subscribe to connection disconnect
-// events. If add is false, the subscriber is removed.
-func (s *server) registerDisconnectSub(ch chan<- struct{}, add bool) {
+func (s *server) addConn(c net.Conn) {
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	if add {
-		if s.disconnectSub == nil {
-			s.disconnectSub = make(map[chan<- struct{}]struct{})
-		}
-		s.disconnectSub[ch] = struct{}{}
-	} else {
-		delete(s.disconnectSub, ch)
-	}
-
-}
-
-// addConn adds c to the server's list of clients.
-//
-// If the returned error is of type inUseOtherUserError then the
-// returned connIdentity is also valid.
-func (s *server) addConn(c net.Conn, isHTTP bool) (ci connIdentity, err error) {
-	ci, err = s.getConnIdentity(c)
-	if err != nil {
-		return
-	}
-
-	// If the connected user changes, reset the backend server state to make
-	// sure node keys don't leak between users.
-	var doReset bool
-	defer func() {
-		if doReset {
-			s.logf("identity changed; resetting server")
-			s.bsMu.Lock()
-			s.bs.Reset()
-			s.bsMu.Unlock()
-		}
-	}()
-
-	s.mu.Lock()
-	defer s.mu.Unlock()
-
 	if s.clients == nil {
 		s.clients = map[net.Conn]bool{}
 	}
-	if s.allClients == nil {
-		s.allClients = map[net.Conn]connIdentity{}
-	}
-
-	if err := s.checkConnIdentityLocked(ci); err != nil {
-		return ci, err
-	}
-
-	if !isHTTP {
-		s.clients[c] = true
-	}
-	s.allClients[c] = ci
-
-	if s.lastUserID != ci.UserID {
-		if s.lastUserID != "" {
-			doReset = true
-		}
-		s.lastUserID = ci.UserID
-	}
-	return ci, nil
+	s.clients[c] = true
 }
 
 func (s *server) removeAndCloseConn(c net.Conn) {
 	s.mu.Lock()
 	delete(s.clients, c)
-	delete(s.allClients, c)
-	remain := len(s.allClients)
-	for sub := range s.disconnectSub {
-		select {
-		case sub <- struct{}{}:
-		default:
-		}
-	}
+	remain := len(s.clients)
 	s.mu.Unlock()
 
 	if remain == 0 && s.resetOnZero {
-		if s.b.InServerMode() {
-			s.logf("client disconnected; staying alive in server mode")
-		} else {
-			s.logf("client disconnected; stopping server")
-			s.bsMu.Lock()
-			s.bs.Reset()
-			s.bsMu.Unlock()
-		}
+		s.bsMu.Lock()
+		s.bs.Reset()
+		s.bsMu.Unlock()
 	}
 	c.Close()
 }
@@ -421,48 +140,9 @@ func (s *server) stopAll() {
 	s.clients = nil
 }
 
-// setServerModeUserLocked is called when we're in server mode but our s.serverModeUser is nil.
-//
-// s.mu must be held
-func (s *server) setServerModeUserLocked() {
-	var ci connIdentity
-	var ok bool
-	for _, ci = range s.allClients {
-		ok = true
-		break
-	}
-	if !ok {
-		s.logf("ipnserver: [unexpected] now in server mode, but no connected client")
-		return
-	}
-	if ci.Unknown {
-		return
-	}
-	if ci.User != nil {
-		s.logf("ipnserver: now in server mode; user=%v", ci.User.Username)
-		s.serverModeUser = ci.User
-	} else {
-		s.logf("ipnserver: [unexpected] now in server mode, but nil User")
-	}
-}
-
 func (s *server) writeToClients(b []byte) {
-	inServerMode := s.b.InServerMode()
-
 	s.mu.Lock()
 	defer s.mu.Unlock()
-
-	if inServerMode {
-		if s.serverModeUser == nil {
-			s.setServerModeUserLocked()
-		}
-	} else {
-		if s.serverModeUser != nil {
-			s.logf("ipnserver: no longer in server mode")
-			s.serverModeUser = nil
-		}
-	}
-
 	for c := range s.clients {
 		ipn.WriteMsg(c, b)
 	}
@@ -480,7 +160,6 @@ func Run(ctx context.Context, logf logger.Logf, logid string, getEngine func() (
 	}
 
 	server := &server{
-		logf:        logf,
 		resetOnZero: !opts.SurviveDisconnects,
 	}
 
@@ -497,11 +176,12 @@ func Run(ctx context.Context, logf logger.Logf, logid string, getEngine func() (
 	logf("Listening on %v", listen.Addr())
 
 	bo := backoff.NewBackoff("ipnserver", logf, 30*time.Second)
+
 	var unservedConn net.Conn // if non-nil, accepted, but hasn't served yet
 
 	eng, err := getEngine()
 	if err != nil {
-		logf("ipnserver: initial getEngine call: %v", err)
+		logf("Initial getEngine call: %v", err)
 		for i := 1; ctx.Err() == nil; i++ {
 			c, err := listen.Accept()
 			if err != nil {
@@ -509,14 +189,14 @@ func Run(ctx context.Context, logf logger.Logf, logid string, getEngine func() (
 				bo.BackOff(ctx, err)
 				continue
 			}
-			logf("ipnserver: try%d: trying getEngine again...", i)
+			logf("%d: trying getEngine again...", i)
 			eng, err = getEngine()
 			if err == nil {
 				logf("%d: GetEngine worked; exiting failure loop", i)
 				unservedConn = c
 				break
 			}
-			logf("ipnserver%d: getEngine failed again: %v", i, err)
+			logf("%d: getEngine failed again: %v", i, err)
 			errMsg := err.Error()
 			go func() {
 				defer c.Close()
@@ -537,24 +217,6 @@ func Run(ctx context.Context, logf logger.Logf, logid string, getEngine func() (
 		if err != nil {
 			return fmt.Errorf("ipn.NewFileStore(%q): %v", opts.StatePath, err)
 		}
-		if opts.AutostartStateKey == "" {
-			autoStartKey, err := store.ReadState(ipn.ServerModeStartKey)
-			if err != nil && err != ipn.ErrStateNotExist {
-				return fmt.Errorf("calling ReadState on %s: %w", opts.StatePath, err)
-			}
-			key := string(autoStartKey)
-			if strings.HasPrefix(key, "user-") {
-				uid := strings.TrimPrefix(key, "user-")
-				u, err := server.lookupUserFromID(uid)
-				if err != nil {
-					logf("ipnserver: found server mode auto-start key %q; failed to load user: %v", key, err)
-				} else {
-					logf("ipnserver: found server mode auto-start key %q (user %s)", key, u.Username)
-					server.serverModeUser = u
-				}
-				opts.AutostartStateKey = ipn.StateKey(key)
-			}
-		}
 	} else {
 		store = &ipn.MemoryStore{}
 	}
@@ -570,16 +232,18 @@ func Run(ctx context.Context, logf logger.Logf, logid string, getEngine func() (
 
 	if opts.DebugMux != nil {
 		opts.DebugMux.HandleFunc("/debug/ipn", func(w http.ResponseWriter, r *http.Request) {
-			serveHTMLStatus(w, b)
+			w.Header().Set("Content-Type", "text/html; charset=utf-8")
+			st := b.Status()
+			// TODO(bradfitz): add LogID and opts to st?
+			st.WriteHTML(w)
 		})
 	}
 
-	server.b = b
 	server.bs = ipn.NewBackendServer(logf, b, server.writeToClients)
 
 	if opts.AutostartStateKey != "" {
 		server.bs.GotCommand(&ipn.Command{
-			Version: version.Long,
+			Version: version.LONG,
 			Start: &ipn.StartArgs{
 				Opts: ipn.Options{
 					StateKey:         opts.AutostartStateKey,
@@ -610,11 +274,6 @@ func Run(ctx context.Context, logf logger.Logf, logid string, getEngine func() (
 	return ctx.Err()
 }
 
-// BabysitProc runs the current executable as a child process with the
-// provided args, capturing its output, writing it to files, and
-// restarting the process on any crashes.
-//
-// It's only currently (2020-10-29) used on Windows.
 func BabysitProc(ctx context.Context, args []string, logf logger.Logf) {
 
 	executable, err := os.Executable()
@@ -622,14 +281,6 @@ func BabysitProc(ctx context.Context, args []string, logf logger.Logf) {
 		panic("cannot determine executable: " + err.Error())
 	}
 
-	if runtime.GOOS == "windows" {
-		if len(args) != 2 && args[0] != "/subproc" {
-			panic(fmt.Sprintf("unexpected arguments %q", args))
-		}
-		logID := args[1]
-		logf = filelogger.New("tailscale-service", logID, logf)
-	}
-
 	var proc struct {
 		mu sync.Mutex
 		p  *os.Process
@@ -743,69 +394,3 @@ func BabysitProc(ctx context.Context, args []string, logf logger.Logf) {
 func FixedEngine(eng wgengine.Engine) func() (wgengine.Engine, error) {
 	return func() (wgengine.Engine, error) { return eng, nil }
 }
-
-type dummyAddr string
-type oneConnListener struct {
-	conn net.Conn
-}
-
-func (l *oneConnListener) Accept() (c net.Conn, err error) {
-	c = l.conn
-	if c == nil {
-		err = io.EOF
-		return
-	}
-	err = nil
-	l.conn = nil
-	return
-}
-
-func (l *oneConnListener) Close() error { return nil }
-
-func (l *oneConnListener) Addr() net.Addr { return dummyAddr("unused-address") }
-
-func (a dummyAddr) Network() string { return string(a) }
-func (a dummyAddr) String() string  { return string(a) }
-
-// protoSwitchConn is a net.Conn that's we want to speak HTTP to but
-// it's already had a few bytes read from it to determine that it's
-// HTTP. So we Read from its bufio.Reader. On Close, we we tell the
-// server it's closed, so the server can account the who's connected.
-type protoSwitchConn struct {
-	s *server
-	net.Conn
-	br        *bufio.Reader
-	closeOnce sync.Once
-}
-
-func (psc *protoSwitchConn) Read(p []byte) (int, error) { return psc.br.Read(p) }
-func (psc *protoSwitchConn) Close() error {
-	psc.closeOnce.Do(func() { psc.s.removeAndCloseConn(psc.Conn) })
-	return nil
-}
-
-func (s *server) localhostHandler(ci connIdentity) http.Handler {
-	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
-		if ci.Unknown {
-			io.WriteString(w, "<html><title>Tailscale</title><body><h1>Tailscale</h1>This is the local Tailscale daemon.")
-			return
-		}
-		serveHTMLStatus(w, s.b)
-	})
-}
-
-func serveHTMLStatus(w http.ResponseWriter, b *ipn.LocalBackend) {
-	w.Header().Set("Content-Type", "text/html; charset=utf-8")
-	st := b.Status()
-	// TODO(bradfitz): add LogID and opts to st?
-	st.WriteHTML(w)
-}
-
-func peerPid(entries []netstat.Entry, la, ra netaddr.IPPort) int {
-	for _, e := range entries {
-		if e.Local == ra && e.Remote == la {
-			return e.Pid
-		}
-	}
-	return 0
-}

ipn/ipnserver/server_test.go

@@ -7,6 +7,8 @@ package ipnserver_test
 import (
 	"context"
 	"fmt"
+	"io/ioutil"
+	"os"
 	"path/filepath"
 	"strings"
 	"testing"
@@ -23,7 +25,11 @@ func TestRunMultipleAccepts(t *testing.T) {
 	ctx, cancel := context.WithCancel(context.Background())
 	defer cancel()
 
-	td := t.TempDir()
+	td, err := ioutil.TempDir("", "TestRunMultipleAccepts")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(td)
 	socketPath := filepath.Join(td, "tailscale.sock")
 
 	logf := func(format string, args ...interface{}) {

ipn/local.go

@@ -5,12 +5,9 @@
 package ipn
 
 import (
-	"bytes"
 	"context"
 	"errors"
 	"fmt"
-	"os"
-	"runtime"
 	"strings"
 	"sync"
 	"time"
@@ -37,15 +34,6 @@ import (
 	"tailscale.com/wgengine/tsdns"
 )
 
-var controlDebugFlags = getControlDebugFlags()
-
-func getControlDebugFlags() []string {
-	if e := os.Getenv("TS_DEBUG_CONTROL_FLAGS"); e != "" {
-		return strings.Split(e, ",")
-	}
-	return nil
-}
-
 // LocalBackend is the glue between the major pieces of the Tailscale
 // network software: the cloud control plane (via controlclient), the
 // network data plane (via wgengine), and the user-facing UIs and CLIs
@@ -62,39 +50,32 @@ type LocalBackend struct {
 	ctxCancel       context.CancelFunc // cancels ctx
 	logf            logger.Logf        // general logging
 	keyLogf         logger.Logf        // for printing list of peers on change
-	statsLogf       logger.Logf        // for printing peers stats on change
 	e               wgengine.Engine
 	store           StateStore
 	backendLogID    string
 	portpoll        *portlist.Poller // may be nil
-	portpollOnce    sync.Once        // guards starting readPoller
-	gotPortPollRes  chan struct{}    // closed upon first readPoller result
-	serverURL       string           // tailcontrol URL
+	portpollOnce    sync.Once
+	serverURL       string // tailcontrol URL
 	newDecompressor func() (controlclient.Decompressor, error)
 
 	filterHash string
 
 	// The mutex protects the following elements.
-	mu             sync.Mutex
-	notify         func(Notify)
-	c              *controlclient.Client
-	stateKey       StateKey // computed in part from user-provided value
-	userID         string   // current controlling user ID (for Windows, primarily)
-	prefs          *Prefs
-	inServerMode   bool
-	machinePrivKey wgcfg.PrivateKey
-	state          State
+	mu       sync.Mutex
+	notify   func(Notify)
+	c        *controlclient.Client
+	stateKey StateKey
+	prefs    *Prefs
+	state    State
 	// hostinfo is mutated in-place while mu is held.
 	hostinfo *tailcfg.Hostinfo
 	// netMap is not mutated in-place once set.
 	netMap       *controlclient.NetworkMap
-	activeLogin  string // last logged LoginName from netMap
 	engineStatus EngineStatus
 	endpoints    []string
 	blocked      bool
 	authURL      string
-	interact     bool
-	prevIfState  *interfaces.State
+	interact     int
 
 	// statusLock must be held before calling statusChanged.Wait() or
 	// statusChanged.Broadcast().
@@ -119,17 +100,15 @@ func NewLocalBackend(logf logger.Logf, logid string, store StateStore, e wgengin
 	}
 
 	b := &LocalBackend{
-		ctx:            ctx,
-		ctxCancel:      cancel,
-		logf:           logf,
-		keyLogf:        logger.LogOnChange(logf, 5*time.Minute, time.Now),
-		statsLogf:      logger.LogOnChange(logf, 5*time.Minute, time.Now),
-		e:              e,
-		store:          store,
-		backendLogID:   logid,
-		state:          NoState,
-		portpoll:       portpoll,
-		gotPortPollRes: make(chan struct{}),
+		ctx:          ctx,
+		ctxCancel:    cancel,
+		logf:         logf,
+		keyLogf:      logger.LogOnChange(logf, 5*time.Minute, time.Now),
+		e:            e,
+		store:        store,
+		backendLogID: logid,
+		state:        NoState,
+		portpoll:     portpoll,
 	}
 	e.SetLinkChangeCallback(b.linkChange)
 	b.statusChanged = sync.NewCond(&b.statusLock)
@@ -137,31 +116,15 @@ func NewLocalBackend(logf logger.Logf, logid string, store StateStore, e wgengin
 	return b, nil
 }
 
-// linkChange is called (in a new goroutine) by wgengine when its link monitor
-// detects a network change.
 func (b *LocalBackend) linkChange(major bool, ifst *interfaces.State) {
-	b.mu.Lock()
-	defer b.mu.Unlock()
-
-	hadPAC := b.prevIfState.HasPAC()
-	b.prevIfState = ifst
-
-	networkUp := ifst.AnyInterfaceUp()
-	if b.c != nil {
-		go b.c.SetPaused(b.state == Stopped || !networkUp)
-	}
-
-	// If the PAC-ness of the network changed, reconfig wireguard+route to
-	// add/remove subnets.
-	if hadPAC != ifst.HasPAC() {
-		b.logf("linkChange: in state %v; PAC changed from %v->%v", b.state, hadPAC, ifst.HasPAC())
-		switch b.state {
-		case NoState, Stopped:
-			// Do nothing.
-		default:
-			go b.authReconfig()
-		}
-	}
+	// TODO(bradfitz): on a major link change, ask controlclient
+	// whether its host (e.g. login.tailscale.com) is reachable.
+	// If not, down the world and poll for a bit. Windows' WinHTTP
+	// service might be unable to resolve its WPAD PAC URL if we
+	// have DNS/routes configured. So we need to remove that DNS
+	// and those routes to let it figure out its proxy
+	// settings. Once it's back up and happy, then we can resume
+	// and our connection to the control server would work again.
 }
 
 // Shutdown halts the backend and all its sub-components. The backend
@@ -269,14 +232,8 @@ func (b *LocalBackend) setClientStatus(st controlclient.Status) {
 			b.prefs.Persist = st.Persist.Clone()
 		}
 	}
-	if temporarilySetMachineKeyInPersist() && b.prefs.Persist != nil &&
-		b.prefs.Persist.LegacyFrontendPrivateMachineKey.IsZero() {
-		b.prefs.Persist.LegacyFrontendPrivateMachineKey = b.machinePrivKey
-		prefsChanged = true
-	}
 	if st.NetMap != nil {
-		b.setNetMapLocked(st.NetMap)
-
+		b.netMap = st.NetMap
 	}
 	if st.URL != "" {
 		b.authURL = st.URL
@@ -315,16 +272,23 @@ func (b *LocalBackend) setClientStatus(st controlclient.Status) {
 
 		b.updateFilter(st.NetMap, prefs)
 		b.e.SetNetworkMap(st.NetMap)
+
 		if !dnsMapsEqual(st.NetMap, netMap) {
 			b.updateDNSMap(st.NetMap)
 		}
-		b.e.SetDERPMap(st.NetMap.DERPMap)
+
+		disableDERP := prefs != nil && prefs.DisableDERP
+		if disableDERP {
+			b.e.SetDERPMap(nil)
+		} else {
+			b.e.SetDERPMap(st.NetMap.DERPMap)
+		}
 
 		b.send(Notify{NetMap: st.NetMap})
 	}
 	if st.URL != "" {
 		b.logf("Received auth URL: %.20v...", st.URL)
-		if interact {
+		if interact > 0 {
 			b.popBrowserAuthNow()
 		}
 	}
@@ -346,8 +310,9 @@ func (b *LocalBackend) setWgengineStatus(s *wgengine.Status, err error) {
 		return
 	}
 
+	es := b.parseWgStatus(s)
+
 	b.mu.Lock()
-	es := b.parseWgStatusLocked(s)
 	c := b.c
 	b.engineStatus = es
 	b.endpoints = append([]string{}, s.LocalAddrs...)
@@ -415,44 +380,18 @@ func (b *LocalBackend) Start(opts Options) error {
 		return fmt.Errorf("loading requested state: %v", err)
 	}
 
-	b.inServerMode = b.prefs.ForceDaemon
 	b.serverURL = b.prefs.ControlURL
 	hostinfo.RoutableIPs = append(hostinfo.RoutableIPs, b.prefs.AdvertiseRoutes...)
 	hostinfo.RequestTags = append(hostinfo.RequestTags, b.prefs.AdvertiseTags...)
-	if b.inServerMode || runtime.GOOS == "windows" {
-		b.logf("Start: serverMode=%v", b.inServerMode)
-	}
 	applyPrefsToHostinfo(hostinfo, b.prefs)
 
 	b.notify = opts.Notify
-	b.setNetMapLocked(nil)
+	b.netMap = nil
 	persist := b.prefs.Persist
-	machinePrivKey := b.machinePrivKey
 	b.mu.Unlock()
 
 	b.updateFilter(nil, nil)
 
-	if b.portpoll != nil {
-		b.portpollOnce.Do(func() {
-			go b.portpoll.Run(b.ctx)
-			go b.readPoller()
-
-			// Give the poller a second to get results to
-			// prevent it from restarting our map poll
-			// HTTP request (via doSetHostinfoFilterServices >
-			// cli.SetHostinfo). In practice this is very quick.
-			t0 := time.Now()
-			timer := time.NewTimer(time.Second)
-			select {
-			case <-b.gotPortPollRes:
-				b.logf("got initial portlist info in %v", time.Since(t0).Round(time.Millisecond))
-				timer.Stop()
-			case <-timer.C:
-				b.logf("timeout waiting for initial portlist")
-			}
-		})
-	}
-
 	var discoPublic tailcfg.DiscoKey
 	if controlclient.Debug.Disco {
 		discoPublic = b.e.DiscoPublicKey()
@@ -464,22 +403,29 @@ func (b *LocalBackend) Start(opts Options) error {
 		persist = &controlclient.Persist{}
 	}
 	cli, err := controlclient.New(controlclient.Options{
-		MachinePrivateKey: machinePrivKey,
-		Logf:              logger.WithPrefix(b.logf, "control: "),
-		Persist:           *persist,
-		ServerURL:         b.serverURL,
-		AuthKey:           opts.AuthKey,
-		Hostinfo:          hostinfo,
-		KeepAlive:         true,
-		NewDecompressor:   b.newDecompressor,
-		HTTPTestClient:    opts.HTTPTestClient,
-		DiscoPublicKey:    discoPublic,
-		DebugFlags:        controlDebugFlags,
+		Logf:            logger.WithPrefix(b.logf, "control: "),
+		Persist:         *persist,
+		ServerURL:       b.serverURL,
+		AuthKey:         opts.AuthKey,
+		Hostinfo:        hostinfo,
+		KeepAlive:       true,
+		NewDecompressor: b.newDecompressor,
+		HTTPTestClient:  opts.HTTPTestClient,
+		DiscoPublicKey:  discoPublic,
 	})
 	if err != nil {
 		return err
 	}
 
+	// At this point, we have finished using hostinfo without synchronization,
+	// so it is safe to start readPoller which concurrently writes to it.
+	if b.portpoll != nil {
+		b.portpollOnce.Do(func() {
+			go b.portpoll.Run(b.ctx)
+			go b.readPoller()
+		})
+	}
+
 	b.mu.Lock()
 	b.c = cli
 	endpoints := b.endpoints
@@ -495,12 +441,6 @@ func (b *LocalBackend) Start(opts Options) error {
 
 	b.mu.Lock()
 	prefs := b.prefs.Clone()
-
-	if temporarilySetMachineKeyInPersist() && prefs.Persist != nil &&
-		prefs.Persist.LegacyFrontendPrivateMachineKey.IsZero() {
-		prefs.Persist.LegacyFrontendPrivateMachineKey = b.machinePrivKey
-	}
-
 	b.mu.Unlock()
 
 	blid := b.backendLogID
@@ -615,7 +555,7 @@ func (b *LocalBackend) updateDNSMap(netMap *controlclient.NetworkMap) {
 
 	nameToIP := make(map[string]netaddr.IP)
 	set := func(name string, addrs []wgcfg.CIDR) {
-		if len(addrs) == 0 || name == "" {
+		if len(addrs) == 0 {
 			return
 		}
 		nameToIP[name] = netaddr.IPFrom16(addrs[0].IP.Addr)
@@ -634,7 +574,6 @@ func (b *LocalBackend) updateDNSMap(netMap *controlclient.NetworkMap) {
 // readPoller is a goroutine that receives service lists from
 // b.portpoll and propagates them into the controlclient's HostInfo.
 func (b *LocalBackend) readPoller() {
-	n := 0
 	for {
 		ports, ok := <-b.portpoll.C
 		if !ok {
@@ -661,11 +600,6 @@ func (b *LocalBackend) readPoller() {
 		b.mu.Unlock()
 
 		b.doSetHostinfoFilterServices(hi)
-
-		n++
-		if n == 1 {
-			close(b.gotPortPollRes)
-		}
 	}
 }
 
@@ -677,7 +611,7 @@ func (b *LocalBackend) send(n Notify) {
 	b.mu.Unlock()
 
 	if notify != nil {
-		n.Version = version.Long
+		n.Version = version.LONG
 		notify(n)
 	} else {
 		b.logf("nil notify callback; dropping %+v", n)
@@ -689,7 +623,7 @@ func (b *LocalBackend) send(n Notify) {
 func (b *LocalBackend) popBrowserAuthNow() {
 	b.mu.Lock()
 	url := b.authURL
-	b.interact = false
+	b.interact = 0
 	b.authURL = ""
 	b.mu.Unlock()
 
@@ -703,171 +637,48 @@ func (b *LocalBackend) popBrowserAuthNow() {
 	}
 }
 
-// initMachineKeyLocked is called to initialize b.machinePrivKey.
-//
-// b.prefs must already be initialized.
-// b.stateKey should be set too, but just for nicer log messages.
-// b.mu must be held.
-func (b *LocalBackend) initMachineKeyLocked() (err error) {
-	if temporarilySetMachineKeyInPersist() {
-		defer func() {
-			if err != nil {
-				return
-			}
-			if b.prefs != nil && b.prefs.Persist != nil {
-				b.prefs.Persist.LegacyFrontendPrivateMachineKey = b.machinePrivKey
-			}
-		}()
-	}
-
-	if !b.machinePrivKey.IsZero() {
-		// Already set.
-		return nil
-	}
-
-	var legacyMachineKey wgcfg.PrivateKey
-	if b.prefs.Persist != nil {
-		legacyMachineKey = b.prefs.Persist.LegacyFrontendPrivateMachineKey
-	}
-
-	keyText, err := b.store.ReadState(MachineKeyStateKey)
-	if err == nil {
-		if err := b.machinePrivKey.UnmarshalText(keyText); err != nil {
-			return fmt.Errorf("invalid key in %s key of %v: %w", MachineKeyStateKey, b.store, err)
-		}
-		if b.machinePrivKey.IsZero() {
-			return fmt.Errorf("invalid zero key stored in %v key of %v", MachineKeyStateKey, b.store)
-		}
-		if !legacyMachineKey.IsZero() && !bytes.Equal(legacyMachineKey[:], b.machinePrivKey[:]) {
-			b.logf("frontend-provided legacy machine key ignored; used value from server state")
-		}
-		return nil
-	}
-	if err != ErrStateNotExist {
-		return fmt.Errorf("error reading %v key of %v: %w", MachineKeyStateKey, b.store, err)
-	}
-
-	// If we didn't find one already on disk and the prefs already
-	// have a legacy machine key, use that. Otherwise generate a
-	// new one.
-	if !legacyMachineKey.IsZero() {
-		if b.stateKey == "" {
-			b.logf("using frontend-provided legacy machine key")
-		} else {
-			b.logf("using legacy machine key from state key %q", b.stateKey)
-		}
-		b.machinePrivKey = legacyMachineKey
-	} else {
-		b.logf("generating new machine key")
-		var err error
-		b.machinePrivKey, err = wgcfg.NewPrivateKey()
-		if err != nil {
-			return fmt.Errorf("initializing new machine key: %w", err)
-		}
-	}
-
-	keyText, _ = b.machinePrivKey.MarshalText()
-	if err := b.store.WriteState(MachineKeyStateKey, keyText); err != nil {
-		b.logf("error writing machine key to store: %v", err)
-		return err
-	}
-
-	b.logf("machine key written to store")
-	return nil
-}
-
-// writeServerModeStartState stores the ServerModeStartKey value based on the current
-// user and prefs. If userID is blank or prefs is blank, no work is done.
-//
-// b.mu may either be held or not.
-func (b *LocalBackend) writeServerModeStartState(userID string, prefs *Prefs) {
-	if userID == "" || prefs == nil {
-		return
-	}
-
-	if prefs.ForceDaemon {
-		stateKey := StateKey("user-" + userID)
-		if err := b.store.WriteState(ServerModeStartKey, []byte(stateKey)); err != nil {
-			b.logf("WriteState error: %v", err)
-		}
-		// It's important we do this here too, even if it looks
-		// redundant with the one in the 'if stateKey != ""'
-		// check block above. That one won't fire in the case
-		// where the Windows client started up in client mode.
-		// This happens when we transition into server mode:
-		if err := b.store.WriteState(stateKey, prefs.ToBytes()); err != nil {
-			b.logf("WriteState error: %v", err)
-		}
-	} else {
-		if err := b.store.WriteState(ServerModeStartKey, nil); err != nil {
-			b.logf("WriteState error: %v", err)
-		}
-	}
-}
-
 // loadStateLocked sets b.prefs and b.stateKey based on a complex
 // combination of key, prefs, and legacyPath. b.mu must be held when
 // calling.
-func (b *LocalBackend) loadStateLocked(key StateKey, prefs *Prefs, legacyPath string) (err error) {
+func (b *LocalBackend) loadStateLocked(key StateKey, prefs *Prefs, legacyPath string) error {
 	if prefs == nil && key == "" {
 		panic("state key and prefs are both unset")
 	}
 
-	// Optimistically set stateKey (for initMachineKeyLocked's
-	// logging), but revert it if we return an error so a later SetPrefs
-	// call can't pick it up if it's bogus.
-	b.stateKey = key
-	defer func() {
-		if err != nil {
-			b.stateKey = ""
-		}
-	}()
-
 	if key == "" {
-		// Frontend owns the state, we just need to obey it.
-		//
-		// If the frontend (e.g. on Windows) supplied the
-		// optional/legacy machine key then it's used as the
-		// value instead of making up a new one.
-		b.logf("using frontend prefs: %s", prefs.Pretty())
+		// Frontend fully owns the state, we just need to obey it.
+		b.logf("Using frontend prefs")
 		b.prefs = prefs.Clone()
-		if err := b.initMachineKeyLocked(); err != nil {
-			return fmt.Errorf("initMachineKeyLocked: %w", err)
-		}
-		b.writeServerModeStartState(b.userID, b.prefs)
+		b.stateKey = ""
 		return nil
 	}
 
 	if prefs != nil {
 		// Backend owns the state, but frontend is trying to migrate
 		// state into the backend.
-		b.logf("importing frontend prefs into backend store; frontend prefs: %s", prefs.Pretty())
+		b.logf("Importing frontend prefs into backend store")
 		if err := b.store.WriteState(key, prefs.ToBytes()); err != nil {
 			return fmt.Errorf("store.WriteState: %v", err)
 		}
 	}
 
-	b.logf("using backend prefs")
+	b.logf("Using backend prefs")
 	bs, err := b.store.ReadState(key)
 	if err != nil {
 		if errors.Is(err, ErrStateNotExist) {
 			if legacyPath != "" {
 				b.prefs, err = LoadPrefs(legacyPath)
 				if err != nil {
-					if !errors.Is(err, os.ErrNotExist) {
-						b.logf("failed to load legacy prefs: %v", err)
-					}
+					b.logf("Failed to load legacy prefs: %v", err)
 					b.prefs = NewPrefs()
 				} else {
-					b.logf("imported prefs from relaynode for %q: %v", key, b.prefs.Pretty())
+					b.logf("Imported state from relaynode for %q", key)
 				}
 			} else {
 				b.prefs = NewPrefs()
-				b.logf("created empty state for %q: %s", key, b.prefs.Pretty())
-			}
-			if err := b.initMachineKeyLocked(); err != nil {
-				return fmt.Errorf("initMachineKeyLocked: %w", err)
+				b.logf("Created empty state for %q", key)
 			}
+			b.stateKey = key
 			return nil
 		}
 		return fmt.Errorf("store.ReadState(%q): %v", key, err)
@@ -876,10 +687,7 @@ func (b *LocalBackend) loadStateLocked(key StateKey, prefs *Prefs, legacyPath st
 	if err != nil {
 		return fmt.Errorf("PrefsFromBytes: %v", err)
 	}
-	b.logf("backend prefs for %q: %s", key, b.prefs.Pretty())
-	if err := b.initMachineKeyLocked(); err != nil {
-		return fmt.Errorf("initMachineKeyLocked: %w", err)
-	}
+	b.stateKey = key
 	return nil
 }
 
@@ -891,12 +699,6 @@ func (b *LocalBackend) State() State {
 	return b.state
 }
 
-func (b *LocalBackend) InServerMode() bool {
-	b.mu.Lock()
-	defer b.mu.Unlock()
-	return b.inServerMode
-}
-
 // getEngineStatus returns a copy of b.engineStatus.
 //
 // TODO(bradfitz): remove this and use Status() throughout.
@@ -924,7 +726,7 @@ func (b *LocalBackend) Login(token *oauth2.Token) {
 func (b *LocalBackend) StartLoginInteractive() {
 	b.mu.Lock()
 	b.assertClientLocked()
-	b.interact = true
+	b.interact++
 	url := b.authURL
 	c := b.c
 	b.mu.Unlock()
@@ -955,7 +757,7 @@ func (b *LocalBackend) FakeExpireAfter(x time.Duration) {
 	if e.IsZero() || time.Until(e) > x {
 		mapCopy.Expiry = time.Now().Add(x)
 	}
-	b.setNetMapLocked(&mapCopy)
+	b.netMap = &mapCopy
 	b.send(Notify{NetMap: b.netMap})
 }
 
@@ -970,33 +772,30 @@ func (b *LocalBackend) Ping(ipStr string) {
 	})
 }
 
-// parseWgStatusLocked returns an EngineStatus based on s.
-//
-// b.mu must be held; mostly because the caller is about to anyway, and doing so
-// gives us slightly better guarantees about the two peers stats lines not
-// being intermixed if there are concurrent calls to our caller.
-func (b *LocalBackend) parseWgStatusLocked(s *wgengine.Status) (ret EngineStatus) {
-	var peerStats, peerKeys strings.Builder
+func (b *LocalBackend) parseWgStatus(s *wgengine.Status) (ret EngineStatus) {
+	var (
+		peerStats []string
+		peerKeys  []string
+	)
 
 	ret.LiveDERPs = s.DERPs
 	ret.LivePeers = map[tailcfg.NodeKey]wgengine.PeerStatus{}
 	for _, p := range s.Peers {
 		if !p.LastHandshake.IsZero() {
-			fmt.Fprintf(&peerStats, "%d/%d ", p.RxBytes, p.TxBytes)
-			fmt.Fprintf(&peerKeys, "%s ", p.NodeKey.ShortString())
-
+			peerStats = append(peerStats, fmt.Sprintf("%d/%d", p.RxBytes, p.TxBytes))
 			ret.NumLive++
 			ret.LivePeers[p.NodeKey] = p
 
+			peerKeys = append(peerKeys, p.NodeKey.ShortString())
 		}
 		ret.RBytes += p.RxBytes
 		ret.WBytes += p.TxBytes
 	}
-
-	// [GRINDER STATS LINES] - please don't remove (used for log parsing)
-	if peerStats.Len() > 0 {
-		b.keyLogf("peer keys: %s", strings.TrimSpace(peerKeys.String()))
-		b.statsLogf("v%v peers: %v", version.Long, strings.TrimSpace(peerStats.String()))
+	if len(peerStats) > 0 {
+		// [GRINDER STATS LINE] - please don't remove (used for log parsing)
+		b.keyLogf("peer keys: %s", strings.Join(peerKeys, " "))
+		// [GRINDER STATS LINE] - please don't remove (used for log parsing)
+		b.logf("v%v peers: %v", version.LONG, strings.Join(peerStats, " "))
 	}
 	return ret
 }
@@ -1013,12 +812,6 @@ func (b *LocalBackend) shieldsAreUp() bool {
 	return b.prefs.ShieldsUp
 }
 
-func (b *LocalBackend) SetCurrentUserID(uid string) {
-	b.mu.Lock()
-	b.userID = uid
-	b.mu.Unlock()
-}
-
 func (b *LocalBackend) SetWantRunning(wantRunning bool) {
 	b.mu.Lock()
 	new := b.prefs.Clone()
@@ -1033,8 +826,8 @@ func (b *LocalBackend) SetWantRunning(wantRunning bool) {
 
 // SetPrefs saves new user preferences and propagates them throughout
 // the system. Implements Backend.
-func (b *LocalBackend) SetPrefs(newp *Prefs) {
-	if newp == nil {
+func (b *LocalBackend) SetPrefs(new *Prefs) {
+	if new == nil {
 		panic("SetPrefs got nil prefs")
 	}
 
@@ -1043,64 +836,51 @@ func (b *LocalBackend) SetPrefs(newp *Prefs) {
 	netMap := b.netMap
 	stateKey := b.stateKey
 
-	oldp := b.prefs
-	newp.Persist = oldp.Persist // caller isn't allowed to override this
-	b.prefs = newp
-	b.inServerMode = newp.ForceDaemon
+	old := b.prefs
+	new.Persist = old.Persist // caller isn't allowed to override this
+	b.prefs = new
 	// We do this to avoid holding the lock while doing everything else.
-	newp = b.prefs.Clone()
+	new = b.prefs.Clone()
 
 	oldHi := b.hostinfo
 	newHi := oldHi.Clone()
 	newHi.RoutableIPs = append([]wgcfg.CIDR(nil), b.prefs.AdvertiseRoutes...)
-	applyPrefsToHostinfo(newHi, newp)
+	applyPrefsToHostinfo(newHi, new)
 	b.hostinfo = newHi
 	hostInfoChanged := !oldHi.Equal(newHi)
-	userID := b.userID
 
 	b.mu.Unlock()
 
 	if stateKey != "" {
-		if err := b.store.WriteState(stateKey, newp.ToBytes()); err != nil {
+		if err := b.store.WriteState(stateKey, new.ToBytes()); err != nil {
 			b.logf("Failed to save new controlclient state: %v", err)
 		}
 	}
-	b.writeServerModeStartState(userID, newp)
 
 	// [GRINDER STATS LINE] - please don't remove (used for log parsing)
-	b.logf("SetPrefs: %v", newp.Pretty())
-	if netMap != nil {
-		if login := netMap.UserProfiles[netMap.User].LoginName; login != "" {
-			if newp.Persist == nil {
-				b.logf("active login: %s", login)
-			} else if newp.Persist.LoginName != login {
-				// Corp issue 461: sometimes the wrong prefs are
-				// logged; the frontend isn't always getting
-				// notified (to update its prefs/persist) on
-				// account switch.  Log this while we figure it
-				// out.
-				b.logf("active login: %s ([unexpected] corp#461, not %s)", newp.Persist.LoginName)
-			}
-		}
-	}
+	b.logf("SetPrefs: %v", new.Pretty())
 
-	if oldp.ShieldsUp != newp.ShieldsUp || hostInfoChanged {
+	if old.ShieldsUp != new.ShieldsUp || hostInfoChanged {
 		b.doSetHostinfoFilterServices(newHi)
 	}
 
-	b.updateFilter(netMap, newp)
+	b.updateFilter(netMap, new)
 
-	if netMap != nil {
+	turnDERPOff := new.DisableDERP && !old.DisableDERP
+	turnDERPOn := !new.DisableDERP && old.DisableDERP
+	if turnDERPOff {
+		b.e.SetDERPMap(nil)
+	} else if turnDERPOn && netMap != nil {
 		b.e.SetDERPMap(netMap.DERPMap)
 	}
 
-	if oldp.WantRunning != newp.WantRunning {
+	if old.WantRunning != new.WantRunning {
 		b.stateMachine()
 	} else {
 		b.authReconfig()
 	}
 
-	b.send(Notify{Prefs: newp})
+	b.send(Notify{Prefs: new})
 }
 
 // doSetHostinfoFilterServices calls SetHostinfo on the controlclient,
@@ -1153,7 +933,6 @@ func (b *LocalBackend) authReconfig() {
 	blocked := b.blocked
 	uc := b.prefs
 	nm := b.netMap
-	hasPAC := b.prevIfState.HasPAC()
 	b.mu.Unlock()
 
 	if blocked {
@@ -1174,22 +953,16 @@ func (b *LocalBackend) authReconfig() {
 		flags |= controlclient.AllowDefaultRoute
 		// TODO(apenwarr): Make subnet routes a different pref?
 		flags |= controlclient.AllowSubnetRoutes
+		// TODO(apenwarr): Remove this once we sort out subnet routes.
+		//  Right now default routes are broken in Windows, but
+		//  controlclient doesn't properly send subnet routes. So
+		//  let's convert a default route into a subnet route in order
+		//  to allow experimentation.
+		flags |= controlclient.HackDefaultRoute
 	}
 	if uc.AllowSingleHosts {
 		flags |= controlclient.AllowSingleHosts
 	}
-	if hasPAC {
-		// TODO(bradfitz): make this policy configurable per
-		// domain, flesh out all the edge cases where subnet
-		// routes might shadow corp HTTP proxies, DNS servers,
-		// domain controllers, etc. For now we just want
-		// Tailscale to stay enabled while laptops roam
-		// between corp & non-corp networks.
-		if flags&controlclient.AllowSubnetRoutes != 0 {
-			b.logf("authReconfig: have PAC; disabling subnet routes")
-			flags &^= controlclient.AllowSubnetRoutes
-		}
-	}
 
 	cfg, err := nm.WGCfg(b.logf, flags)
 	if err != nil {
@@ -1339,7 +1112,6 @@ func (b *LocalBackend) enterState(newState State) {
 	prefs := b.prefs
 	notify := b.notify
 	bc := b.c
-	networkUp := b.prevIfState.AnyInterfaceUp()
 	b.mu.Unlock()
 
 	if state == newState {
@@ -1352,7 +1124,7 @@ func (b *LocalBackend) enterState(newState State) {
 	}
 
 	if bc != nil {
-		bc.SetPaused(newState == Stopped || !networkUp)
+		bc.SetPaused(newState == Stopped)
 	}
 
 	switch newState {
@@ -1479,25 +1251,15 @@ func (b *LocalBackend) requestEngineStatusAndWait() {
 //  rebooting will fix it.
 func (b *LocalBackend) Logout() {
 	b.mu.Lock()
+	b.assertClientLocked()
 	c := b.c
-	b.setNetMapLocked(nil)
+	b.netMap = nil
 	b.mu.Unlock()
 
-	if c == nil {
-		// Double Logout can happen via repeated IPN
-		// connections to ipnserver making it repeatedly
-		// transition from 1->0 total connections, which on
-		// Windows by default ("client mode") causes a Logout
-		// on the transition to zero.
-		// Previously this crashed when we asserted that c was non-nil
-		// here.
-		return
-	}
-
 	c.Logout()
 
 	b.mu.Lock()
-	b.setNetMapLocked(nil)
+	b.netMap = nil
 	b.mu.Unlock()
 
 	b.stateMachine()
@@ -1526,52 +1288,19 @@ func (b *LocalBackend) setNetInfo(ni *tailcfg.NetInfo) {
 	c.SetNetInfo(ni)
 }
 
-func (b *LocalBackend) setNetMapLocked(nm *controlclient.NetworkMap) {
-	var login string
-	if nm != nil {
-		login = nm.UserProfiles[nm.User].LoginName
-		if login == "" {
-			login = "<missing-profile>"
-		}
-	}
-	b.netMap = nm
-	if login != b.activeLogin {
-		b.logf("active login: %v", login)
-		b.activeLogin = login
-	}
-}
-
 // TestOnlyPublicKeys returns the current machine and node public
 // keys. Used in tests only to facilitate automated node authorization
 // in the test harness.
 func (b *LocalBackend) TestOnlyPublicKeys() (machineKey tailcfg.MachineKey, nodeKey tailcfg.NodeKey) {
 	b.mu.Lock()
 	prefs := b.prefs
-	machinePrivKey := b.machinePrivKey
 	b.mu.Unlock()
 
-	if prefs == nil || machinePrivKey.IsZero() {
+	if prefs == nil {
 		return
 	}
 
-	mk := machinePrivKey.Public()
+	mk := prefs.Persist.PrivateMachineKey.Public()
 	nk := prefs.Persist.PrivateNodeKey.Public()
 	return tailcfg.MachineKey(mk), tailcfg.NodeKey(nk)
 }
-
-// temporarilySetMachineKeyInPersist reports whether we should set
-// the machine key in Prefs.Persist.LegacyFrontendPrivateMachineKey
-// for the frontend to write out to its preferences for use later.
-//
-// TODO: remove this in Tailscale 1.3.x (so it effectively always
-// returns false). It just exists so users can downgrade from 1.2.x to
-// 1.0.x.  But eventually we want to stop sending the machine key to
-// clients. We can't do that until 1.0.x is no longer supported.
-func temporarilySetMachineKeyInPersist() bool {
-	//lint:ignore S1008 for comments
-	if runtime.GOOS == "darwin" || runtime.GOOS == "android" {
-		// iOS, macOS, Android users can't downgrade anyway.
-		return false
-	}
-	return true
-}

ipn/loglines_test.go

@@ -5,7 +5,6 @@
 package ipn
 
 import (
-	"reflect"
 	"testing"
 	"time"
 
@@ -21,7 +20,7 @@ import (
 // being logged by the expected functions. Update these tests if moving log lines between
 // functions.
 func TestLocalLogLines(t *testing.T) {
-	logListen := tstest.NewLogLineTracker(t.Logf, []string{
+	logListen := tstest.ListenFor(t.Logf, []string{
 		"SetPrefs: %v",
 		"peer keys: %s",
 		"v%v peers: %v",
@@ -49,7 +48,6 @@ func TestLocalLogLines(t *testing.T) {
 	if err != nil {
 		t.Fatal(err)
 	}
-	defer lb.Shutdown()
 
 	// custom adjustments for required non-nil fields
 	lb.prefs = NewPrefs()
@@ -57,10 +55,30 @@ func TestLocalLogLines(t *testing.T) {
 	// hacky manual override of the usual log-on-change behaviour of keylogf
 	lb.keyLogf = logListen.Logf
 
-	testWantRemain := func(wantRemain ...string) func(t *testing.T) {
+	// testing infrastructure
+	type linesTest struct {
+		name string
+		want []string
+	}
+
+	tests := []linesTest{
+		{
+			name: "after prefs",
+			want: []string{
+				"peer keys: %s",
+				"v%v peers: %v",
+			},
+		},
+		{
+			name: "after peers",
+			want: []string{},
+		},
+	}
+
+	testLogs := func(want linesTest) func(t *testing.T) {
 		return func(t *testing.T) {
-			if remain := logListen.Check(); !reflect.DeepEqual(remain, wantRemain) {
-				t.Errorf("remain %q, want %q", remain, wantRemain)
+			if linesLeft := logListen.Check(); len(linesLeft) != len(want.want) {
+				t.Errorf("got %v, expected %v", linesLeft, want)
 			}
 		}
 	}
@@ -71,7 +89,7 @@ func TestLocalLogLines(t *testing.T) {
 	prefs.Persist = persist
 	lb.SetPrefs(prefs)
 
-	t.Run("after_prefs", testWantRemain("peer keys: %s", "v%v peers: %v"))
+	t.Run(tests[0].name, testLogs(tests[0]))
 
 	// log peers, peer keys
 	status := &wgengine.Status{
@@ -83,9 +101,7 @@ func TestLocalLogLines(t *testing.T) {
 		}},
 		LocalAddrs: []string{"idk an address"},
 	}
-	lb.mu.Lock()
-	lb.parseWgStatusLocked(status)
-	lb.mu.Unlock()
+	lb.parseWgStatus(status)
 
-	t.Run("after_peers", testWantRemain())
+	t.Run(tests[1].name, testLogs(tests[1]))
 }

ipn/message.go

@@ -80,7 +80,7 @@ func NewBackendServer(logf logger.Logf, b Backend, sendNotifyMsg func(b []byte))
 }
 
 func (bs *BackendServer) send(n Notify) {
-	n.Version = version.Long
+	n.Version = version.LONG
 	b, err := json.Marshal(n)
 	if err != nil {
 		log.Fatalf("Failed json.Marshal(notify): %v\n%#v", err, n)
@@ -92,17 +92,6 @@ func (bs *BackendServer) SendErrorMessage(msg string) {
 	bs.send(Notify{ErrMessage: &msg})
 }
 
-// SendInUseOtherUserErrorMessage sends a Notify message to the client that
-// both sets the state to 'InUseOtherUser' and sets the associated reason
-// to msg.
-func (bs *BackendServer) SendInUseOtherUserErrorMessage(msg string) {
-	inUse := InUseOtherUser
-	bs.send(Notify{
-		State:      &inUse,
-		ErrMessage: &msg,
-	})
-}
-
 // GotCommandMsg parses the incoming message b as a JSON Command and
 // calls GotCommand with it.
 func (bs *BackendServer) GotCommandMsg(b []byte) error {
@@ -117,14 +106,14 @@ func (bs *BackendServer) GotCommandMsg(b []byte) error {
 }
 
 func (bs *BackendServer) GotFakeCommand(cmd *Command) error {
-	cmd.Version = version.Long
+	cmd.Version = version.LONG
 	return bs.GotCommand(cmd)
 }
 
 func (bs *BackendServer) GotCommand(cmd *Command) error {
-	if cmd.Version != version.Long && !cmd.AllowVersionSkew {
+	if cmd.Version != version.LONG && !cmd.AllowVersionSkew {
 		vs := fmt.Sprintf("GotCommand: Version mismatch! frontend=%#v backend=%#v",
-			cmd.Version, version.Long)
+			cmd.Version, version.LONG)
 		bs.logf("%s", vs)
 		// ignore the command, but send a message back to the
 		// caller so it can realize the version mismatch too.
@@ -208,9 +197,9 @@ func (bc *BackendClient) GotNotifyMsg(b []byte) {
 	if err := json.Unmarshal(b, &n); err != nil {
 		log.Fatalf("BackendClient.Notify: cannot decode message (length=%d)\n%#v", len(b), string(b))
 	}
-	if n.Version != version.Long && !bc.AllowVersionSkew {
+	if n.Version != version.LONG && !bc.AllowVersionSkew {
 		vs := fmt.Sprintf("GotNotify: Version mismatch! frontend=%#v backend=%#v",
-			version.Long, n.Version)
+			version.LONG, n.Version)
 		bc.logf("%s", vs)
 		// delete anything in the notification except the version,
 		// to prevent incorrect operation.
@@ -225,7 +214,7 @@ func (bc *BackendClient) GotNotifyMsg(b []byte) {
 }
 
 func (bc *BackendClient) send(cmd Command) {
-	cmd.Version = version.Long
+	cmd.Version = version.LONG
 	b, err := json.Marshal(cmd)
 	if err != nil {
 		log.Fatalf("Failed json.Marshal(cmd): %v\n%#v\n", err, cmd)

ipn/prefs.go

@@ -11,8 +11,6 @@ import (
 	"log"
 	"os"
 	"path/filepath"
-	"runtime"
-	"strings"
 
 	"github.com/tailscale/wireguard-go/wgcfg"
 	"tailscale.com/atomicfile"
@@ -20,57 +18,44 @@ import (
 	"tailscale.com/wgengine/router"
 )
 
-//go:generate go run tailscale.com/cmd/cloner -type=Prefs -output=prefs_clone.go
-
 // Prefs are the user modifiable settings of the Tailscale node agent.
 type Prefs struct {
 	// ControlURL is the URL of the control server to use.
 	ControlURL string
-
 	// RouteAll specifies whether to accept subnet and default routes
 	// advertised by other nodes on the Tailscale network.
 	RouteAll bool
-
 	// AllowSingleHosts specifies whether to install routes for each
 	// node IP on the tailscale network, in addition to a route for
 	// the whole network.
-	// This corresponds to the "tailscale up --host-routes" value,
-	// which defaults to true.
 	//
 	// TODO(danderson): why do we have this? It dumps a lot of stuff
 	// into the routing table, and a single network route _should_ be
 	// all that we need. But when I turn this off in my tailscaled,
 	// packets stop flowing. What's up with that?
 	AllowSingleHosts bool
-
 	// CorpDNS specifies whether to install the Tailscale network's
 	// DNS configuration, if it exists.
 	CorpDNS bool
-
 	// WantRunning indicates whether networking should be active on
 	// this node.
 	WantRunning bool
-
 	// ShieldsUp indicates whether to block all incoming connections,
 	// regardless of the control-provided packet filter. If false, we
 	// use the packet filter as provided. If true, we block incoming
 	// connections.
 	ShieldsUp bool
-
 	// AdvertiseTags specifies groups that this node wants to join, for
 	// purposes of ACL enforcement. These can be referenced from the ACL
 	// security policy. Note that advertising a tag doesn't guarantee that
 	// the control server will allow you to take on the rights for that
 	// tag.
 	AdvertiseTags []string
-
 	// Hostname is the hostname to use for identifying the node. If
 	// not set, os.Hostname is used.
 	Hostname string
-
 	// OSVersion overrides tailcfg.Hostinfo's OSVersion.
 	OSVersion string
-
 	// DeviceModel overrides tailcfg.Hostinfo's DeviceModel.
 	DeviceModel string
 
@@ -82,17 +67,8 @@ type Prefs struct {
 	// users narrow it down a bit.
 	NotepadURLs bool
 
-	// ForceDaemon specifies whether a platform that normally
-	// operates in "client mode" (that is, requires an active user
-	// logged in with the GUI app running) should keep running after the
-	// GUI ends and/or the user logs out.
-	//
-	// The only current applicable platform is Windows. This
-	// forced Windows to go into "server mode" where Tailscale is
-	// running even with no users logged in. This might also be
-	// used for macOS in the future. This setting has no effect
-	// for Linux/etc, which always operate in daemon mode.
-	ForceDaemon bool `json:"ForceDaemon,omitempty"`
+	// DisableDERP prevents DERP from being used.
+	DisableDERP bool
 
 	// The following block of options only have an effect on Linux.
 
@@ -100,7 +76,6 @@ type Prefs struct {
 	// Tailscale network as reachable through the current
 	// node.
 	AdvertiseRoutes []wgcfg.CIDR
-
 	// NoSNAT specifies whether to source NAT traffic going to
 	// destinations in AdvertiseRoutes. The default is to apply source
 	// NAT, which makes the traffic appear to come from the router
@@ -112,7 +87,6 @@ type Prefs struct {
 	//
 	// Linux-only.
 	NoSNAT bool
-
 	// NetfilterMode specifies how much to manage netfilter rules for
 	// Tailscale, if at all.
 	NetfilterMode router.NetfilterMode
@@ -128,46 +102,16 @@ type Prefs struct {
 // IsEmpty reports whether p is nil or pointing to a Prefs zero value.
 func (p *Prefs) IsEmpty() bool { return p == nil || p.Equals(&Prefs{}) }
 
-func (p *Prefs) Pretty() string { return p.pretty(runtime.GOOS) }
-func (p *Prefs) pretty(goos string) string {
-	var sb strings.Builder
-	sb.WriteString("Prefs{")
-	fmt.Fprintf(&sb, "ra=%v ", p.RouteAll)
-	if !p.AllowSingleHosts {
-		sb.WriteString("mesh=false ")
-	}
-	fmt.Fprintf(&sb, "dns=%v want=%v ", p.CorpDNS, p.WantRunning)
-	if p.ForceDaemon {
-		sb.WriteString("server=true ")
-	}
-	if p.NotepadURLs {
-		sb.WriteString("notepad=true ")
-	}
-	if p.ShieldsUp {
-		sb.WriteString("shields=true ")
-	}
-	if len(p.AdvertiseRoutes) > 0 || goos == "linux" {
-		fmt.Fprintf(&sb, "routes=%v ", p.AdvertiseRoutes)
-	}
-	if len(p.AdvertiseRoutes) > 0 || p.NoSNAT {
-		fmt.Fprintf(&sb, "snat=%v ", !p.NoSNAT)
-	}
-	if len(p.AdvertiseTags) > 0 {
-		fmt.Fprintf(&sb, "tags=%s ", strings.Join(p.AdvertiseTags, ","))
-	}
-	if goos == "linux" {
-		fmt.Fprintf(&sb, "nf=%v ", p.NetfilterMode)
-	}
-	if p.ControlURL != "" && p.ControlURL != "https://login.tailscale.com" {
-		fmt.Fprintf(&sb, "url=%q ", p.ControlURL)
-	}
+func (p *Prefs) Pretty() string {
+	var pp string
 	if p.Persist != nil {
-		sb.WriteString(p.Persist.Pretty())
+		pp = p.Persist.Pretty()
 	} else {
-		sb.WriteString("Persist=nil")
+		pp = "Persist=nil"
 	}
-	sb.WriteString("}")
-	return sb.String()
+	return fmt.Sprintf("Prefs{ra=%v mesh=%v dns=%v want=%v notepad=%v derp=%v shields=%v routes=%v snat=%v nf=%v %v}",
+		p.RouteAll, p.AllowSingleHosts, p.CorpDNS, p.WantRunning,
+		p.NotepadURLs, !p.DisableDERP, p.ShieldsUp, p.AdvertiseRoutes, !p.NoSNAT, p.NetfilterMode, pp)
 }
 
 func (p *Prefs) ToBytes() []byte {
@@ -193,13 +137,13 @@ func (p *Prefs) Equals(p2 *Prefs) bool {
 		p.CorpDNS == p2.CorpDNS &&
 		p.WantRunning == p2.WantRunning &&
 		p.NotepadURLs == p2.NotepadURLs &&
+		p.DisableDERP == p2.DisableDERP &&
 		p.ShieldsUp == p2.ShieldsUp &&
 		p.NoSNAT == p2.NoSNAT &&
 		p.NetfilterMode == p2.NetfilterMode &&
 		p.Hostname == p2.Hostname &&
 		p.OSVersion == p2.OSVersion &&
 		p.DeviceModel == p2.DeviceModel &&
-		p.ForceDaemon == p2.ForceDaemon &&
 		compareIPNets(p.AdvertiseRoutes, p2.AdvertiseRoutes) &&
 		compareStrings(p.AdvertiseTags, p2.AdvertiseTags) &&
 		p.Persist.Equals(p2.Persist)
@@ -269,16 +213,26 @@ func PrefsFromBytes(b []byte, enforceDefaults bool) (*Prefs, error) {
 	return p, err
 }
 
+// Clone returns a deep copy of p.
+func (p *Prefs) Clone() *Prefs {
+	// TODO: write a faster/non-Fatal-y Clone implementation?
+	p2, err := PrefsFromBytes(p.ToBytes(), false)
+	if err != nil {
+		log.Fatalf("Prefs was uncopyable: %v\n", err)
+	}
+	return p2
+}
+
 // LoadPrefs loads a legacy relaynode config file into Prefs
 // with sensible migration defaults set.
 func LoadPrefs(filename string) (*Prefs, error) {
 	data, err := ioutil.ReadFile(filename)
 	if err != nil {
-		return nil, fmt.Errorf("LoadPrefs open: %w", err) // err includes path
+		return nil, fmt.Errorf("loading prefs from %q: %v", filename, err)
 	}
 	p, err := PrefsFromBytes(data, false)
 	if err != nil {
-		return nil, fmt.Errorf("LoadPrefs(%q) decode: %w", filename, err)
+		return nil, fmt.Errorf("decoding prefs in %q: %v", filename, err)
 	}
 	return p, nil
 }

ipn/prefs_clone.go

@@ -1,51 +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.
-
-// Code generated by tailscale.com/cmd/cloner -type Prefs; DO NOT EDIT.
-
-package ipn
-
-import (
-	"github.com/tailscale/wireguard-go/wgcfg"
-	"tailscale.com/control/controlclient"
-	"tailscale.com/wgengine/router"
-)
-
-// Clone makes a deep copy of Prefs.
-// The result aliases no memory with the original.
-func (src *Prefs) Clone() *Prefs {
-	if src == nil {
-		return nil
-	}
-	dst := new(Prefs)
-	*dst = *src
-	dst.AdvertiseTags = append(src.AdvertiseTags[:0:0], src.AdvertiseTags...)
-	dst.AdvertiseRoutes = append(src.AdvertiseRoutes[:0:0], src.AdvertiseRoutes...)
-	if dst.Persist != nil {
-		dst.Persist = new(controlclient.Persist)
-		*dst.Persist = *src.Persist
-	}
-	return dst
-}
-
-// A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type Prefs
-var _PrefsNeedsRegeneration = Prefs(struct {
-	ControlURL       string
-	RouteAll         bool
-	AllowSingleHosts bool
-	CorpDNS          bool
-	WantRunning      bool
-	ShieldsUp        bool
-	AdvertiseTags    []string
-	Hostname         string
-	OSVersion        string
-	DeviceModel      string
-	NotepadURLs      bool
-	ForceDaemon      bool
-	AdvertiseRoutes  []wgcfg.CIDR
-	NoSNAT           bool
-	NetfilterMode    router.NetfilterMode
-	Persist          *controlclient.Persist
-}{})

ipn/prefs_test.go

@@ -5,12 +5,8 @@
 package ipn
 
 import (
-	"errors"
-	"fmt"
-	"os"
 	"reflect"
 	"testing"
-	"time"
 
 	"github.com/tailscale/wireguard-go/wgcfg"
 	"tailscale.com/control/controlclient"
@@ -28,7 +24,7 @@ func fieldsOf(t reflect.Type) (fields []string) {
 func TestPrefsEqual(t *testing.T) {
 	tstest.PanicOnLog()
 
-	prefsHandles := []string{"ControlURL", "RouteAll", "AllowSingleHosts", "CorpDNS", "WantRunning", "ShieldsUp", "AdvertiseTags", "Hostname", "OSVersion", "DeviceModel", "NotepadURLs", "ForceDaemon", "AdvertiseRoutes", "NoSNAT", "NetfilterMode", "Persist"}
+	prefsHandles := []string{"ControlURL", "RouteAll", "AllowSingleHosts", "CorpDNS", "WantRunning", "ShieldsUp", "AdvertiseTags", "Hostname", "OSVersion", "DeviceModel", "NotepadURLs", "DisableDERP", "AdvertiseRoutes", "NoSNAT", "NetfilterMode", "Persist"}
 	if have := fieldsOf(reflect.TypeOf(Prefs{})); !reflect.DeepEqual(have, prefsHandles) {
 		t.Errorf("Prefs.Equal check might be out of sync\nfields: %q\nhandled: %q\n",
 			have, prefsHandles)
@@ -282,92 +278,3 @@ func TestPrefsPersist(t *testing.T) {
 	}
 	checkPrefs(t, p)
 }
-
-func TestPrefsPretty(t *testing.T) {
-	tests := []struct {
-		p    Prefs
-		os   string
-		want string
-	}{
-		{
-			Prefs{},
-			"linux",
-			"Prefs{ra=false mesh=false dns=false want=false routes=[] nf=off Persist=nil}",
-		},
-		{
-			Prefs{},
-			"windows",
-			"Prefs{ra=false mesh=false dns=false want=false Persist=nil}",
-		},
-		{
-			Prefs{ShieldsUp: true},
-			"windows",
-			"Prefs{ra=false mesh=false dns=false want=false shields=true Persist=nil}",
-		},
-		{
-			Prefs{AllowSingleHosts: true},
-			"windows",
-			"Prefs{ra=false dns=false want=false Persist=nil}",
-		},
-		{
-			Prefs{
-				NotepadURLs:      true,
-				AllowSingleHosts: true,
-			},
-			"windows",
-			"Prefs{ra=false dns=false want=false notepad=true Persist=nil}",
-		},
-		{
-			Prefs{
-				AllowSingleHosts: true,
-				WantRunning:      true,
-				ForceDaemon:      true, // server mode
-			},
-			"windows",
-			"Prefs{ra=false dns=false want=true server=true Persist=nil}",
-		},
-		{
-			Prefs{
-				AllowSingleHosts: true,
-				WantRunning:      true,
-				ControlURL:       "http://localhost:1234",
-				AdvertiseTags:    []string{"tag:foo", "tag:bar"},
-			},
-			"darwin",
-			`Prefs{ra=false dns=false want=true tags=tag:foo,tag:bar url="http://localhost:1234" Persist=nil}`,
-		},
-		{
-			Prefs{
-				Persist: &controlclient.Persist{},
-			},
-			"linux",
-			`Prefs{ra=false mesh=false dns=false want=false routes=[] nf=off Persist{lm=, o=, n= u=""}}`,
-		},
-		{
-			Prefs{
-				Persist: &controlclient.Persist{
-					PrivateNodeKey: wgcfg.PrivateKey{1: 1},
-				},
-			},
-			"linux",
-			`Prefs{ra=false mesh=false dns=false want=false routes=[] nf=off Persist{lm=, o=, n=[B1VKl] u=""}}`,
-		},
-	}
-	for i, tt := range tests {
-		got := tt.p.pretty(tt.os)
-		if got != tt.want {
-			t.Errorf("%d. wrong String:\n got: %s\nwant: %s\n", i, got, tt.want)
-		}
-	}
-}
-
-func TestLoadPrefsNotExist(t *testing.T) {
-	bogusFile := fmt.Sprintf("/tmp/not-exist-%d", time.Now().UnixNano())
-
-	p, err := LoadPrefs(bogusFile)
-	if errors.Is(err, os.ErrNotExist) {
-		// expected.
-		return
-	}
-	t.Fatalf("unexpected prefs=%#v, err=%v", p, err)
-}

ipn/store.go

@@ -5,10 +5,8 @@
 package ipn
 
 import (
-	"bytes"
 	"encoding/json"
 	"errors"
-	"fmt"
 	"io/ioutil"
 	"os"
 	"path/filepath"
@@ -21,30 +19,6 @@ import (
 // requested state ID doesn't exist.
 var ErrStateNotExist = errors.New("no state with given ID")
 
-const (
-	// MachineKeyStateKey is the key under which we store the machine key,
-	// in its wgcfg.PrivateKey.MarshalText representation.
-	MachineKeyStateKey = StateKey("_machinekey")
-
-	// GlobalDaemonStateKey is the ipn.StateKey that tailscaled
-	// loads on startup.
-	//
-	// We have to support multiple state keys for other OSes (Windows in
-	// particular), but right now Unix daemons run with a single
-	// node-global state. To keep open the option of having per-user state
-	// later, the global state key doesn't look like a username.
-	GlobalDaemonStateKey = StateKey("_daemon")
-
-	// ServerModeStartKey's value, if non-empty, is the value of a
-	// StateKey containing the prefs to start with which to start the
-	// server.
-	//
-	// For example, the value might be "user-1234", meaning the
-	// the server should start with the Prefs JSON loaded from
-	// StateKey "user-1234".
-	ServerModeStartKey = StateKey("server-mode-start-key")
-)
-
 // StateStore persists state, and produces it back on request.
 type StateStore interface {
 	// ReadState returns the bytes associated with ID. Returns (nil,
@@ -60,8 +34,6 @@ type MemoryStore struct {
 	cache map[StateKey][]byte
 }
 
-func (s *MemoryStore) String() string { return "MemoryStore" }
-
 // ReadState implements the StateStore interface.
 func (s *MemoryStore) ReadState(id StateKey) ([]byte, error) {
 	s.mu.Lock()
@@ -95,8 +67,6 @@ type FileStore struct {
 	cache map[StateKey][]byte
 }
 
-func (s *FileStore) String() string { return fmt.Sprintf("FileStore(%q)", s.path) }
-
 // NewFileStore returns a new file store that persists to path.
 func NewFileStore(path string) (*FileStore, error) {
 	bs, err := ioutil.ReadFile(path)
@@ -142,9 +112,6 @@ func (s *FileStore) ReadState(id StateKey) ([]byte, error) {
 func (s *FileStore) WriteState(id StateKey, bs []byte) error {
 	s.mu.Lock()
 	defer s.mu.Unlock()
-	if bytes.Equal(s.cache[id], bs) {
-		return nil
-	}
 	s.cache[id] = append([]byte(nil), bs...)
 	bs, err := json.MarshalIndent(s.cache, "", "  ")
 	if err != nil {

log/filelogger/log.go

@@ -1,199 +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.
-
-// Package filelogger provides localdisk log writing & rotation, primarily for Windows
-// clients. (We get this for free on other platforms.)
-package filelogger
-
-import (
-	"bytes"
-	"fmt"
-	"io/ioutil"
-	"log"
-	"os"
-	"path/filepath"
-	"runtime"
-	"strings"
-	"sync"
-	"time"
-
-	"tailscale.com/types/logger"
-)
-
-const (
-	maxSize  = 100 << 20
-	maxFiles = 50
-)
-
-// New returns a logf wrapper that appends to local disk log
-// files on Windows, rotating old log files as needed to stay under
-// file count & byte limits.
-func New(fileBasePrefix, logID string, logf logger.Logf) logger.Logf {
-	if runtime.GOOS != "windows" {
-		panic("not yet supported on any platform except Windows")
-	}
-	if logf == nil {
-		panic("nil logf")
-	}
-	dir := filepath.Join(os.Getenv("LocalAppData"), "Tailscale", "Logs")
-
-	if err := os.MkdirAll(dir, 0700); err != nil {
-		log.Printf("failed to create local log directory; not writing logs to disk: %v", err)
-		return logf
-	}
-	logf("local disk logdir: %v", dir)
-	lfw := &logFileWriter{
-		fileBasePrefix: fileBasePrefix,
-		logID:          logID,
-		dir:            dir,
-		wrappedLogf:    logf,
-	}
-	return lfw.Logf
-}
-
-// logFileWriter is the state for the log writer & rotator.
-type logFileWriter struct {
-	dir            string      // e.g. `C:\Users\FooBarUser\AppData\Local\Tailscale\Logs`
-	logID          string      // hex logID
-	fileBasePrefix string      // e.g. "tailscale-service" or "tailscale-gui"
-	wrappedLogf    logger.Logf // underlying logger to send to
-
-	mu   sync.Mutex   // guards following
-	buf  bytes.Buffer // scratch buffer to avoid allocs
-	fday civilDay     // day that f was opened; zero means no file yet open
-	f    *os.File     // file currently opened for append
-}
-
-// civilDay is a year, month, and day in the local timezone.
-// It's a comparable value type.
-type civilDay struct {
-	year  int
-	month time.Month
-	day   int
-}
-
-func dayOf(t time.Time) civilDay {
-	return civilDay{t.Year(), t.Month(), t.Day()}
-}
-
-func (w *logFileWriter) Logf(format string, a ...interface{}) {
-	w.mu.Lock()
-	defer w.mu.Unlock()
-
-	w.buf.Reset()
-	fmt.Fprintf(&w.buf, format, a...)
-	if w.buf.Len() == 0 {
-		return
-	}
-	out := w.buf.Bytes()
-	w.wrappedLogf("%s", out)
-
-	// Make sure there's a final newline before we write to the log file.
-	if out[len(out)-1] != '\n' {
-		w.buf.WriteByte('\n')
-		out = w.buf.Bytes()
-	}
-
-	w.appendToFileLocked(out)
-}
-
-// out should end in a newline.
-// w.mu must be held.
-func (w *logFileWriter) appendToFileLocked(out []byte) {
-	now := time.Now()
-	day := dayOf(now)
-	if w.fday != day {
-		w.startNewFileLocked()
-	}
-	if w.f != nil {
-		// RFC3339Nano but with a fixed number (3) of nanosecond digits:
-		const formatPre = "2006-01-02T15:04:05"
-		const formatPost = "Z07:00"
-		fmt.Fprintf(w.f, "%s.%03d%s: %s",
-			now.Format(formatPre),
-			now.Nanosecond()/int(time.Millisecond/time.Nanosecond),
-			now.Format(formatPost),
-			out)
-	}
-}
-
-// startNewFileLocked opens a new log file for writing
-// and also cleans up any old files.
-//
-// w.mu must be held.
-func (w *logFileWriter) startNewFileLocked() {
-	var oldName string
-	if w.f != nil {
-		oldName = filepath.Base(w.f.Name())
-		w.f.Close()
-		w.f = nil
-		w.fday = civilDay{}
-	}
-	w.cleanLocked()
-
-	now := time.Now()
-	day := dayOf(now)
-	name := filepath.Join(w.dir, fmt.Sprintf("%s-%04d%02d%02dT%02d%02d%02d-%d.txt",
-		w.fileBasePrefix,
-		day.year,
-		day.month,
-		day.day,
-		now.Hour(),
-		now.Minute(),
-		now.Second(),
-		now.Unix()))
-	var err error
-	w.f, err = os.Create(name)
-	if err != nil {
-		w.wrappedLogf("failed to create log file: %v", err)
-		return
-	}
-	if oldName != "" {
-		fmt.Fprintf(w.f, "(logID %q; continued from log file %s)\n", w.logID, oldName)
-	} else {
-		fmt.Fprintf(w.f, "(logID %q)\n", w.logID)
-	}
-	w.fday = day
-}
-
-// cleanLocked cleans up old log files.
-//
-// w.mu must be held.
-func (w *logFileWriter) cleanLocked() {
-	fis, _ := ioutil.ReadDir(w.dir)
-	prefix := w.fileBasePrefix + "-"
-	fileSize := map[string]int64{}
-	var files []string
-	var sumSize int64
-	for _, fi := range fis {
-		baseName := filepath.Base(fi.Name())
-		if !strings.HasPrefix(baseName, prefix) {
-			continue
-		}
-		size := fi.Size()
-		fileSize[baseName] = size
-		sumSize += size
-		files = append(files, baseName)
-	}
-	if sumSize > maxSize {
-		w.wrappedLogf("cleaning log files; sum byte count %d > %d", sumSize, maxSize)
-	}
-	if len(files) > maxFiles {
-		w.wrappedLogf("cleaning log files; number of files %d > %d", len(files), maxFiles)
-	}
-	for (sumSize > maxSize || len(files) > maxFiles) && len(files) > 0 {
-		target := files[0]
-		files = files[1:]
-
-		targetSize := fileSize[target]
-		targetFull := filepath.Join(w.dir, target)
-		err := os.Remove(targetFull)
-		if err != nil {
-			w.wrappedLogf("error cleaning log file: %v", err)
-		} else {
-			sumSize -= targetSize
-			w.wrappedLogf("cleaned log file %s (size %d); new bytes=%v, files=%v", targetFull, targetSize, sumSize, len(files))
-		}
-	}
-}

log/logheap/logheap.go

@@ -15,18 +15,15 @@ import (
 	"time"
 )
 
-// LogHeap uploads a JSON logtail record with the base64 heap pprof by means
-// of an HTTP POST request to the endpoint referred to in postURL.
+// LogHeap writes a JSON logtail record with the base64 heap pprof to
+// os.Stderr.
 func LogHeap(postURL string) {
 	if postURL == "" {
 		return
 	}
 	runtime.GC()
 	buf := new(bytes.Buffer)
-	if err := pprof.WriteHeapProfile(buf); err != nil {
-		log.Printf("LogHeap: %v", err)
-		return
-	}
+	pprof.WriteHeapProfile(buf)
 
 	ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
 	defer cancel()

logpolicy/logpolicy.go

@@ -315,9 +315,6 @@ func New(collection string) *Policy {
 	} else {
 		lflags = log.LstdFlags
 	}
-	if v, _ := strconv.ParseBool(os.Getenv("TS_DEBUG_LOG_TIME")); v {
-		lflags = log.LstdFlags | log.Lmicroseconds
-	}
 	if runningUnderSystemd() {
 		// If journalctl is going to prepend its own timestamp
 		// anyway, no need to add one.
@@ -359,7 +356,7 @@ func New(collection string) *Policy {
 		newc.PrivateID = logtail.PrivateID{}
 		newc.Collection = collection
 	}
-	if newc.PrivateID.IsZero() {
+	if newc.PrivateID == (logtail.PrivateID{}) {
 		newc.PrivateID, err = logtail.NewPrivateID()
 		if err != nil {
 			log.Fatalf("logpolicy: NewPrivateID() should never fail")
@@ -395,7 +392,7 @@ func New(collection string) *Policy {
 	log.SetOutput(lw)
 
 	log.Printf("Program starting: v%v, Go %v: %#v",
-		version.Long,
+		version.LONG,
 		strings.TrimPrefix(runtime.Version(), "go"),
 		os.Args)
 	log.Printf("LogID: %v", newc.PublicID)

logtail/filch/filch_test.go

@@ -8,7 +8,7 @@ import (
 	"fmt"
 	"io/ioutil"
 	"os"
-	"runtime"
+	"path/filepath"
 	"strings"
 	"testing"
 	"unicode"
@@ -56,8 +56,19 @@ func (f *filchTest) close(t *testing.T) {
 	}
 }
 
+func genFilePrefix(t *testing.T) (dir, prefix string) {
+	t.Helper()
+	dir, err := ioutil.TempDir("", "filch")
+	if err != nil {
+		t.Fatal(err)
+	}
+	return dir, filepath.Join(dir, "ringbuffer-")
+}
+
 func TestQueue(t *testing.T) {
-	filePrefix := t.TempDir()
+	td, filePrefix := genFilePrefix(t)
+	defer os.RemoveAll(td)
+
 	f := newFilchTest(t, filePrefix, Options{ReplaceStderr: false})
 
 	f.readEOF(t)
@@ -79,7 +90,8 @@ func TestQueue(t *testing.T) {
 
 func TestRecover(t *testing.T) {
 	t.Run("empty", func(t *testing.T) {
-		filePrefix := t.TempDir()
+		td, filePrefix := genFilePrefix(t)
+		defer os.RemoveAll(td)
 		f := newFilchTest(t, filePrefix, Options{ReplaceStderr: false})
 		f.write(t, "hello")
 		f.read(t, "hello")
@@ -92,7 +104,8 @@ func TestRecover(t *testing.T) {
 	})
 
 	t.Run("cur", func(t *testing.T) {
-		filePrefix := t.TempDir()
+		td, filePrefix := genFilePrefix(t)
+		defer os.RemoveAll(td)
 		f := newFilchTest(t, filePrefix, Options{ReplaceStderr: false})
 		f.write(t, "hello")
 		f.close(t)
@@ -110,7 +123,8 @@ func TestRecover(t *testing.T) {
 		filch_test.go:129: r.ReadLine()="hello", want "world"
 		*/
 
-		filePrefix := t.TempDir()
+		td, filePrefix := genFilePrefix(t)
+		defer os.RemoveAll(td)
 		f := newFilchTest(t, filePrefix, Options{ReplaceStderr: false})
 		f.write(t, "hello")
 		f.read(t, "hello")
@@ -129,14 +143,6 @@ func TestRecover(t *testing.T) {
 }
 
 func TestFilchStderr(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		// TODO(bradfitz): this is broken on Windows but not
-		// fully sure why. Investigate.  But notably, the
-		// stderrFD variable (defined in filch.go) and set
-		// below is only ever read in filch_unix.go. So just
-		// skip this for test for now.
-		t.Skip("test broken on Windows")
-	}
 	pipeR, pipeW, err := os.Pipe()
 	if err != nil {
 		t.Fatal(err)
@@ -149,7 +155,8 @@ func TestFilchStderr(t *testing.T) {
 		stderrFD = 2
 	}()
 
-	filePrefix := t.TempDir()
+	td, filePrefix := genFilePrefix(t)
+	defer os.RemoveAll(td)
 	f := newFilchTest(t, filePrefix, Options{ReplaceStderr: true})
 	f.write(t, "hello")
 	if _, err := fmt.Fprintf(pipeW, "filch\n"); err != nil {

net/interfaces/interfaces.go

@@ -10,7 +10,6 @@ import (
 	"net"
 	"net/http"
 	"reflect"
-	"sort"
 	"strings"
 
 	"inet.af/netaddr"
@@ -161,11 +160,10 @@ type State struct {
 	InterfaceUp  map[string]bool
 
 	// HaveV6Global is whether this machine has an IPv6 global address
-	// on some non-Tailscale interface that's up.
+	// on some interface.
 	HaveV6Global bool
 
-	// HaveV4 is whether the machine has some non-localhost,
-	// non-link-local IPv4 address on a non-Tailscale interface that's up.
+	// HaveV4 is whether the machine has some non-localhost IPv4 address.
 	HaveV4 bool
 
 	// IsExpensive is whether the current network interface is
@@ -175,104 +173,30 @@ type State struct {
 
 	// DefaultRouteInterface is the interface name for the machine's default route.
 	// It is not yet populated on all OSes.
-	// Its exact value should not be assumed to be a map key for
-	// the Interface maps above; it's only used for debugging.
 	DefaultRouteInterface string
 
 	// HTTPProxy is the HTTP proxy to use.
 	HTTPProxy string
-
-	// PAC is the URL to the Proxy Autoconfig URL, if applicable.
-	PAC string
-}
-
-func (s *State) String() string {
-	var sb strings.Builder
-	fmt.Fprintf(&sb, "interfaces.State{defaultRoute=%v ifs={", s.DefaultRouteInterface)
-	ifs := make([]string, 0, len(s.InterfaceUp))
-	for k := range s.InterfaceUp {
-		if allLoopbackIPs(s.InterfaceIPs[k]) {
-			continue
-		}
-		ifs = append(ifs, k)
-	}
-	sort.Slice(ifs, func(i, j int) bool {
-		upi, upj := s.InterfaceUp[ifs[i]], s.InterfaceUp[ifs[j]]
-		if upi != upj {
-			// Up sorts before down.
-			return upi
-		}
-		return ifs[i] < ifs[j]
-	})
-	for i, ifName := range ifs {
-		if i > 0 {
-			sb.WriteString(" ")
-		}
-		if s.InterfaceUp[ifName] {
-			fmt.Fprintf(&sb, "%s:[", ifName)
-			needSpace := false
-			for _, ip := range s.InterfaceIPs[ifName] {
-				if ip.IsLinkLocalUnicast() {
-					continue
-				}
-				if needSpace {
-					sb.WriteString(" ")
-				}
-				fmt.Fprintf(&sb, "%s", ip)
-				needSpace = true
-			}
-			sb.WriteString("]")
-		} else {
-			fmt.Fprintf(&sb, "%s:down", ifName)
-		}
-	}
-	sb.WriteString("}")
-
-	if s.IsExpensive {
-		sb.WriteString(" expensive")
-	}
-	if s.HTTPProxy != "" {
-		fmt.Fprintf(&sb, " httpproxy=%s", s.HTTPProxy)
-	}
-	if s.PAC != "" {
-		fmt.Fprintf(&sb, " pac=%s", s.PAC)
-	}
-	fmt.Fprintf(&sb, " v4=%v v6global=%v}", s.HaveV4, s.HaveV6Global)
-	return sb.String()
 }
 
 func (s *State) Equal(s2 *State) bool {
 	return reflect.DeepEqual(s, s2)
 }
 
-func (s *State) HasPAC() bool { return s != nil && s.PAC != "" }
-
-// AnyInterfaceUp reports whether any interface seems like it has Internet access.
-func (s *State) AnyInterfaceUp() bool {
-	return s != nil && (s.HaveV4 || s.HaveV6Global)
-}
-
 // RemoveTailscaleInterfaces modifes s to remove any interfaces that
 // are owned by this process. (TODO: make this true; currently it
 // makes the Linux-only assumption that the interface is named
 // /^tailscale/)
 func (s *State) RemoveTailscaleInterfaces() {
 	for name := range s.InterfaceIPs {
-		if isTailscaleInterfaceName(name) {
+		if name == "Tailscale" || // as it is on Windows
+			strings.HasPrefix(name, "tailscale") { // TODO: use --tun flag value, etc; see TODO in method doc
 			delete(s.InterfaceIPs, name)
 			delete(s.InterfaceUp, name)
 		}
 	}
 }
 
-func isTailscaleInterfaceName(name string) bool {
-	return name == "Tailscale" || // as it is on Windows
-		strings.HasPrefix(name, "tailscale") // TODO: use --tun flag value, etc; see TODO in method doc
-}
-
-// getPAC, if non-nil, returns the current PAC file URL.
-var getPAC func() string
-
 // GetState returns the state of all the current machine's network interfaces.
 //
 // It does not set the returned State.IsExpensive. The caller can populate that.
@@ -282,29 +206,21 @@ func GetState() (*State, error) {
 		InterfaceUp:  make(map[string]bool),
 	}
 	if err := ForeachInterfaceAddress(func(ni Interface, ip netaddr.IP) {
-		ifUp := ni.IsUp()
 		s.InterfaceIPs[ni.Name] = append(s.InterfaceIPs[ni.Name], ip)
-		s.InterfaceUp[ni.Name] = ifUp
-		if ifUp && !ip.IsLoopback() && !ip.IsLinkLocalUnicast() && !isTailscaleInterfaceName(ni.Name) {
-			s.HaveV6Global = s.HaveV6Global || isGlobalV6(ip)
-			s.HaveV4 = s.HaveV4 || ip.Is4()
-		}
+		s.InterfaceUp[ni.Name] = ni.IsUp()
+		s.HaveV6Global = s.HaveV6Global || isGlobalV6(ip)
+		s.HaveV4 = s.HaveV4 || (ip.Is4() && !ip.IsLoopback())
 	}); err != nil {
 		return nil, err
 	}
 	s.DefaultRouteInterface, _ = DefaultRouteInterface()
 
-	if s.AnyInterfaceUp() {
-		req, err := http.NewRequest("GET", LoginEndpointForProxyDetermination, nil)
-		if err != nil {
-			return nil, err
-		}
-		if u, err := tshttpproxy.ProxyFromEnvironment(req); err == nil && u != nil {
-			s.HTTPProxy = u.String()
-		}
-		if getPAC != nil {
-			s.PAC = getPAC()
-		}
+	req, err := http.NewRequest("GET", LoginEndpointForProxyDetermination, nil)
+	if err != nil {
+		return nil, err
+	}
+	if u, err := tshttpproxy.ProxyFromEnvironment(req); err == nil && u != nil {
+		s.HTTPProxy = u.String()
 	}
 
 	return s, nil
@@ -396,15 +312,3 @@ var (
 	linkLocalIPv4 = mustCIDR("169.254.0.0/16")
 	v6Global1     = mustCIDR("2000::/3")
 )
-
-func allLoopbackIPs(ips []netaddr.IP) bool {
-	if len(ips) == 0 {
-		return false
-	}
-	for _, ip := range ips {
-		if !ip.IsLoopback() {
-			return false
-		}
-	}
-	return true
-}

net/interfaces/interfaces_defaultrouteif_todo.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.
 
-// +build !linux,!windows
+// +build !linux
 
 package interfaces
 

net/interfaces/interfaces_test.go

@@ -35,7 +35,6 @@ func TestGetState(t *testing.T) {
 		t.Fatal(err)
 	}
 	t.Logf("Got: %#v", st)
-	t.Logf("As string: %s", st)
 
 	st2, err := GetState()
 	if err != nil {
@@ -47,9 +46,6 @@ func TestGetState(t *testing.T) {
 		// the two GetState calls.
 		t.Fatal("two States back-to-back were not equal")
 	}
-
-	st.RemoveTailscaleInterfaces()
-	t.Logf("As string without Tailscale:\n\t%s", st)
 }
 
 func TestLikelyHomeRouterIP(t *testing.T) {

net/interfaces/interfaces_windows.go

@@ -5,23 +5,16 @@
 package interfaces
 
 import (
-	"fmt"
-	"log"
 	"os/exec"
 	"syscall"
-	"unsafe"
 
 	"go4.org/mem"
-	"golang.org/x/sys/windows"
-	"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
 	"inet.af/netaddr"
-	"tailscale.com/tsconst"
 	"tailscale.com/util/lineread"
 )
 
 func init() {
 	likelyHomeRouterIP = likelyHomeRouterIPWindows
-	getPAC = getPACWindows
 }
 
 /*
@@ -78,113 +71,3 @@ func likelyHomeRouterIPWindows() (ret netaddr.IP, ok bool) {
 	})
 	return ret, !ret.IsZero()
 }
-
-// NonTailscaleMTUs returns a map of interface LUID to interface MTU,
-// for all interfaces except Tailscale tunnels.
-func NonTailscaleMTUs() (map[winipcfg.LUID]uint32, error) {
-	mtus := map[winipcfg.LUID]uint32{}
-	ifs, err := NonTailscaleInterfaces()
-	for luid, iface := range ifs {
-		mtus[luid] = iface.MTU
-	}
-	return mtus, err
-}
-
-// NonTailscaleInterfaces returns a map of interface LUID to interface
-// for all interfaces except Tailscale tunnels.
-func NonTailscaleInterfaces() (map[winipcfg.LUID]*winipcfg.IPAdapterAddresses, error) {
-	ifs, err := winipcfg.GetAdaptersAddresses(windows.AF_UNSPEC, winipcfg.GAAFlagIncludeAllInterfaces)
-	if err != nil {
-		return nil, err
-	}
-
-	ret := map[winipcfg.LUID]*winipcfg.IPAdapterAddresses{}
-	for _, iface := range ifs {
-		if iface.Description() == tsconst.WintunInterfaceDesc {
-			continue
-		}
-		ret[iface.LUID] = iface
-	}
-
-	return ret, nil
-}
-
-// GetWindowsDefault returns the interface that has the non-Tailscale
-// default route for the given address family.
-//
-// It returns (nil, nil) if no interface is found.
-func GetWindowsDefault(family winipcfg.AddressFamily) (*winipcfg.IPAdapterAddresses, error) {
-	ifs, err := NonTailscaleInterfaces()
-	if err != nil {
-		return nil, err
-	}
-
-	routes, err := winipcfg.GetIPForwardTable2(family)
-	if err != nil {
-		return nil, err
-	}
-
-	bestMetric := ^uint32(0)
-	var bestIface *winipcfg.IPAdapterAddresses
-	for _, route := range routes {
-		iface := ifs[route.InterfaceLUID]
-		if route.DestinationPrefix.PrefixLength != 0 || iface == nil {
-			continue
-		}
-		if iface.OperStatus == winipcfg.IfOperStatusUp && route.Metric < bestMetric {
-			bestMetric = route.Metric
-			bestIface = iface
-		}
-	}
-
-	return bestIface, nil
-}
-
-func DefaultRouteInterface() (string, error) {
-	iface, err := GetWindowsDefault(windows.AF_INET)
-	if err != nil {
-		return "", err
-	}
-	if iface == nil {
-		return "(none)", nil
-	}
-	return fmt.Sprintf("%s (%s)", iface.FriendlyName(), iface.Description()), nil
-}
-
-var (
-	winHTTP                  = windows.NewLazySystemDLL("winhttp.dll")
-	detectAutoProxyConfigURL = winHTTP.NewProc("WinHttpDetectAutoProxyConfigUrl")
-
-	kernel32   = windows.NewLazySystemDLL("kernel32.dll")
-	globalFree = kernel32.NewProc("GlobalFree")
-)
-
-const (
-	winHTTP_AUTO_DETECT_TYPE_DHCP  = 0x00000001
-	winHTTP_AUTO_DETECT_TYPE_DNS_A = 0x00000002
-)
-
-func getPACWindows() string {
-	var res *uint16
-	r, _, e := detectAutoProxyConfigURL.Call(
-		winHTTP_AUTO_DETECT_TYPE_DHCP|winHTTP_AUTO_DETECT_TYPE_DNS_A,
-		uintptr(unsafe.Pointer(&res)),
-	)
-	if r == 1 {
-		if res == nil {
-			log.Printf("getPACWindows: unexpected success with nil result")
-			return ""
-		}
-		defer globalFree.Call(uintptr(unsafe.Pointer(res)))
-		return windows.UTF16PtrToString(res)
-	}
-	const (
-		ERROR_WINHTTP_AUTODETECTION_FAILED = 12180
-	)
-	if e == syscall.Errno(ERROR_WINHTTP_AUTODETECTION_FAILED) {
-		// Common case on networks without advertised PAC.
-		return ""
-	}
-	log.Printf("getPACWindows: %T=%v", e, e) // syscall.Errno=0x....
-	return ""
-}

net/interfaces/interfaces_windows_test.go

@@ -1,17 +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.
-
-package interfaces
-
-import "testing"
-
-func BenchmarkGetPACWindows(b *testing.B) {
-	b.ReportAllocs()
-	for i := 0; i < b.N; i++ {
-		v := getPACWindows()
-		if i == 0 {
-			b.Logf("Got: %q", v)
-		}
-	}
-}

net/netcheck/netcheck.go

@@ -156,15 +156,6 @@ type Client struct {
 	// GetSTUNConn6 is like GetSTUNConn4, but for IPv6.
 	GetSTUNConn6 func() STUNConn
 
-	// SkipExternalNetwork controls whether the client should not try
-	// to reach things other than localhost. This is set to true
-	// in tests to avoid probing the local LAN's router, etc.
-	SkipExternalNetwork bool
-
-	// UDPBindAddr, if non-empty, is the address to listen on for UDP.
-	// It defaults to ":0".
-	UDPBindAddr string
-
 	mu       sync.Mutex            // guards following
 	nextFull bool                  // do a full region scan, even if last != nil
 	prev     map[time.Time]*Report // some previous reports
@@ -245,6 +236,7 @@ func (c *Client) ReceiveSTUNPacket(pkt []byte, src netaddr.IPPort) {
 
 	tx, addr, port, err := stun.ParseResponse(pkt)
 	if err != nil {
+		c.mu.Unlock()
 		if _, err := stun.ParseBindingRequest(pkt); err == nil {
 			// This was probably our own netcheck hairpin
 			// check probe coming in late. Ignore.
@@ -781,13 +773,6 @@ func newReport() *Report {
 	}
 }
 
-func (c *Client) udpBindAddr() string {
-	if v := c.UDPBindAddr; v != "" {
-		return v
-	}
-	return ":0"
-}
-
 // GetReport gets a report.
 //
 // It may not be called concurrently with itself.
@@ -847,10 +832,8 @@ func (c *Client) GetReport(ctx context.Context, dm *tailcfg.DERPMap) (*Report, e
 	}
 	defer rs.pc4Hair.Close()
 
-	if !c.SkipExternalNetwork {
-		rs.waitPortMap.Add(1)
-		go rs.probePortMapServices()
-	}
+	rs.waitPortMap.Add(1)
+	go rs.probePortMapServices()
 
 	// At least the Apple Airport Extreme doesn't allow hairpin
 	// sends from a private socket until it's seen traffic from
@@ -868,7 +851,7 @@ func (c *Client) GetReport(ctx context.Context, dm *tailcfg.DERPMap) (*Report, e
 	if f := c.GetSTUNConn4; f != nil {
 		rs.pc4 = f()
 	} else {
-		u4, err := netns.Listener().ListenPacket(ctx, "udp4", c.udpBindAddr())
+		u4, err := netns.Listener().ListenPacket(ctx, "udp4", ":0")
 		if err != nil {
 			c.logf("udp4: %v", err)
 			return nil, err
@@ -881,7 +864,7 @@ func (c *Client) GetReport(ctx context.Context, dm *tailcfg.DERPMap) (*Report, e
 		if f := c.GetSTUNConn6; f != nil {
 			rs.pc6 = f()
 		} else {
-			u6, err := netns.Listener().ListenPacket(ctx, "udp6", c.udpBindAddr())
+			u6, err := netns.Listener().ListenPacket(ctx, "udp6", ":0")
 			if err != nil {
 				c.logf("udp6: %v", err)
 			} else {
@@ -920,10 +903,8 @@ func (c *Client) GetReport(ctx context.Context, dm *tailcfg.DERPMap) (*Report, e
 
 	rs.waitHairCheck(ctx)
 	c.vlogf("hairCheck done")
-	if !c.SkipExternalNetwork {
-		rs.waitPortMap.Wait()
-		c.vlogf("portMap done")
-	}
+	rs.waitPortMap.Wait()
+	c.vlogf("portMap done")
 	rs.stopTimers()
 
 	// Try HTTPS latency check if all STUN probes failed due to UDP presumably being blocked.

net/netcheck/netcheck_test.go

@@ -50,8 +50,7 @@ func TestBasic(t *testing.T) {
 	defer cleanup()
 
 	c := &Client{
-		Logf:        t.Logf,
-		UDPBindAddr: "127.0.0.1:0",
+		Logf: t.Logf,
 	}
 
 	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)

net/netns/netns_default.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.
 
-// +build !linux,!windows
+// +build !linux
 
 package netns
 

net/netns/netns_windows.go

@@ -1,120 +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.
-
-package netns
-
-import (
-	"encoding/binary"
-	"strings"
-	"syscall"
-	"unsafe"
-
-	"golang.org/x/sys/windows"
-	"golang.zx2c4.com/wireguard/windows/tunnel/winipcfg"
-	"tailscale.com/net/interfaces"
-)
-
-func interfaceIndex(iface *winipcfg.IPAdapterAddresses) uint32 {
-	if iface == nil {
-		// The zero ifidx means "unspecified". If we end up passing zero
-		// to bindSocket*(), it unsets the binding and lets the socket
-		// behave as normal again, which is what we want if there's no
-		// default route we can use.
-		return 0
-	}
-	return iface.IfIndex
-}
-
-// control binds c to the Windows interface that holds a default
-// route, and is not the Tailscale WinTun interface.
-func control(network, address string, c syscall.RawConn) error {
-	if strings.HasPrefix(address, "127.") {
-		// Don't bind to an interface for localhost connections,
-		// otherwise we get:
-		//   connectex: The requested address is not valid in its context
-		// (The derphttp tests were failing)
-		return nil
-	}
-	canV4, canV6 := false, false
-	switch network {
-	case "tcp", "udp":
-		canV4, canV6 = true, true
-	case "tcp4", "udp4":
-		canV4 = true
-	case "tcp6", "udp6":
-		canV6 = true
-	}
-
-	if canV4 {
-		iface, err := interfaces.GetWindowsDefault(windows.AF_INET)
-		if err != nil {
-			return err
-		}
-		if err := bindSocket4(c, interfaceIndex(iface)); err != nil {
-			return err
-		}
-	}
-
-	if canV6 {
-		iface, err := interfaces.GetWindowsDefault(windows.AF_INET6)
-		if err != nil {
-			return err
-		}
-		if err := bindSocket6(c, interfaceIndex(iface)); err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-// sockoptBoundInterface is the value of IP_UNICAST_IF and IPV6_UNICAST_IF.
-//
-// See https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
-// and https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ipv6-socket-options
-const sockoptBoundInterface = 31
-
-// bindSocket4 binds the given RawConn to the network interface with
-// index ifidx, for IPv4 traffic only.
-func bindSocket4(c syscall.RawConn, ifidx uint32) error {
-	// For IPv4 (but NOT IPv6) the interface index must be passed
-	// as a big-endian integer (regardless of platform endianness)
-	// because the underlying sockopt takes either an IPv4 address
-	// or an index shoved into IPv4 address representation (an IP
-	// in 0.0.0.0/8 means it's actually an index).
-	//
-	// See https://docs.microsoft.com/en-us/windows/win32/winsock/ipproto-ip-socket-options
-	// and IP_UNICAST_IF.
-	indexAsAddr := nativeToBigEndian(ifidx)
-	var controlErr error
-	err := c.Control(func(fd uintptr) {
-		controlErr = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IP, sockoptBoundInterface, int(indexAsAddr))
-	})
-	if err != nil {
-		return err
-	}
-	return controlErr
-}
-
-// bindSocket6 binds the given RawConn to the network interface with
-// index ifidx, for IPv6 traffic only.
-func bindSocket6(c syscall.RawConn, ifidx uint32) error {
-	var controlErr error
-	err := c.Control(func(fd uintptr) {
-		controlErr = windows.SetsockoptInt(windows.Handle(fd), windows.IPPROTO_IPV6, sockoptBoundInterface, int(ifidx))
-	})
-	if err != nil {
-		return err
-	}
-	return controlErr
-}
-
-// nativeToBigEndian returns i converted into big-endian
-// representation, suitable for passing to Windows APIs that require a
-// mangled uint32.
-func nativeToBigEndian(i uint32) uint32 {
-	var b [4]byte
-	binary.BigEndian.PutUint32(b[:], i)
-	return *(*uint32)(unsafe.Pointer(&b[0]))
-}

net/netstat/netstat.go

@@ -1,36 +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.
-
-// Package netstat returns the local machine's network connection table.
-package netstat
-
-import (
-	"errors"
-	"runtime"
-
-	"inet.af/netaddr"
-)
-
-var ErrNotImplemented = errors.New("not implemented for GOOS=" + runtime.GOOS)
-
-type Entry struct {
-	Local, Remote netaddr.IPPort
-	Pid           int
-	State         string // TODO: type?
-}
-
-// Table contains local machine's TCP connection entries.
-//
-// Currently only TCP (IPv4 and IPv6) are included.
-type Table struct {
-	Entries []Entry
-}
-
-// Get returns the connection table.
-//
-// It returns ErrNotImplemented if the table is not available for the
-// current operating system.
-func Get() (*Table, error) {
-	return get()
-}

net/netstat/netstat_noimpl.go

@@ -1,11 +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.
-
-// +build !windows
-
-package netstat
-
-func get() (*Table, error) {
-	return nil, ErrNotImplemented
-}

net/netstat/netstat_test.go

@@ -1,22 +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.
-
-package netstat
-
-import (
-	"testing"
-)
-
-func TestGet(t *testing.T) {
-	nt, err := Get()
-	if err == ErrNotImplemented {
-		t.Skip("TODO: not implemented")
-	}
-	if err != nil {
-		t.Fatal(err)
-	}
-	for _, e := range nt.Entries {
-		t.Logf("Entry: %+v", e)
-	}
-}

net/netstat/netstat_windows.go

@@ -1,178 +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.
-
-// Package netstat returns the local machine's network connection table.
-package netstat
-
-import (
-	"encoding/binary"
-	"errors"
-	"fmt"
-	"syscall"
-	"unsafe"
-
-	"golang.org/x/sys/windows"
-	"inet.af/netaddr"
-)
-
-// See https://docs.microsoft.com/en-us/windows/win32/api/iphlpapi/nf-iphlpapi-getextendedtcptable
-
-// TCP_TABLE_OWNER_PID_ALL means to include the PID info. The table type
-// we get back from Windows depends on AF_INET vs AF_INET6:
-// MIB_TCPTABLE_OWNER_PID for v4 or MIB_TCP6TABLE_OWNER_PID for v6.
-const tcpTableOwnerPidAll = 5
-
-var (
-	iphlpapi    = syscall.NewLazyDLL("iphlpapi.dll")
-	getTCPTable = iphlpapi.NewProc("GetExtendedTcpTable")
-	// TODO: GetExtendedUdpTable also? if/when needed.
-)
-
-type _MIB_TCPROW_OWNER_PID struct {
-	state      uint32
-	localAddr  uint32
-	localPort  uint32
-	remoteAddr uint32
-	remotePort uint32
-	pid        uint32
-}
-
-type _MIB_TCP6ROW_OWNER_PID struct {
-	localAddr   [16]byte
-	localScope  uint32
-	localPort   uint32
-	remoteAddr  [16]byte
-	remoteScope uint32
-	remotePort  uint32
-	state       uint32
-	pid         uint32
-}
-
-func get() (*Table, error) {
-	t := new(Table)
-	if err := t.addEntries(windows.AF_INET); err != nil {
-		return nil, fmt.Errorf("failed to get IPv4 entries: %w", err)
-	}
-	if err := t.addEntries(windows.AF_INET6); err != nil {
-		return nil, fmt.Errorf("failed to get IPv6 entries: %w", err)
-	}
-	return t, nil
-}
-
-func (t *Table) addEntries(fam int) error {
-	var size uint32
-	var addr unsafe.Pointer
-	var buf []byte
-	for {
-		err, _, _ := getTCPTable.Call(
-			uintptr(addr),
-			uintptr(unsafe.Pointer(&size)),
-			1, // sorted
-			uintptr(fam),
-			tcpTableOwnerPidAll,
-			0, // reserved; "must be zero"
-		)
-		if err == 0 {
-			break
-		}
-		if err == uintptr(syscall.ERROR_INSUFFICIENT_BUFFER) {
-			const maxSize = 10 << 20
-			if size > maxSize || size < 4 {
-				return fmt.Errorf("unreasonable kernel-reported size %d", size)
-			}
-			buf = make([]byte, size)
-			addr = unsafe.Pointer(&buf[0])
-			continue
-		}
-		return syscall.Errno(err)
-	}
-	if len(buf) < int(size) {
-		return errors.New("unexpected size growth from system call")
-	}
-	buf = buf[:size]
-
-	numEntries := *(*uint32)(unsafe.Pointer(&buf[0]))
-	buf = buf[4:]
-
-	var recSize int
-	switch fam {
-	case windows.AF_INET:
-		recSize = 6 * 4
-	case windows.AF_INET6:
-		recSize = 6*4 + 16*2
-	}
-	dataLen := numEntries * uint32(recSize)
-	if uint32(len(buf)) > dataLen {
-		buf = buf[:dataLen]
-	}
-	for len(buf) >= recSize {
-		switch fam {
-		case windows.AF_INET:
-			row := (*_MIB_TCPROW_OWNER_PID)(unsafe.Pointer(&buf[0]))
-			t.Entries = append(t.Entries, Entry{
-				Local:  ipport4(row.localAddr, port(&row.localPort)),
-				Remote: ipport4(row.remoteAddr, port(&row.remotePort)),
-				Pid:    int(row.pid),
-				State:  state(row.state),
-			})
-		case windows.AF_INET6:
-			row := (*_MIB_TCP6ROW_OWNER_PID)(unsafe.Pointer(&buf[0]))
-			t.Entries = append(t.Entries, Entry{
-				Local:  ipport6(row.localAddr, row.localScope, port(&row.localPort)),
-				Remote: ipport6(row.remoteAddr, row.remoteScope, port(&row.remotePort)),
-				Pid:    int(row.pid),
-				State:  state(row.state),
-			})
-		}
-		buf = buf[recSize:]
-	}
-	return nil
-}
-
-var states = []string{
-	"",
-	"CLOSED",
-	"LISTEN",
-	"SYN-SENT",
-	"SYN-RECEIVED",
-	"ESTABLISHED",
-	"FIN-WAIT-1",
-	"FIN-WAIT-2",
-	"CLOSE-WAIT",
-	"CLOSING",
-	"LAST-ACK",
-	"DELETE-TCB",
-}
-
-func state(v uint32) string {
-	if v < uint32(len(states)) {
-		return states[v]
-	}
-	return fmt.Sprintf("unknown-state-%d", v)
-}
-
-func ipport4(addr uint32, port uint16) netaddr.IPPort {
-	a4 := (*[4]byte)(unsafe.Pointer(&addr))
-	return netaddr.IPPort{
-		IP:   netaddr.IPv4(a4[0], a4[1], a4[2], a4[3]),
-		Port: port,
-	}
-}
-
-func ipport6(addr [16]byte, scope uint32, port uint16) netaddr.IPPort {
-	ip := netaddr.IPFrom16(addr)
-	if scope != 0 {
-		// TODO: something better here?
-		ip = ip.WithZone(fmt.Sprint(scope))
-	}
-	return netaddr.IPPort{
-		IP:   ip,
-		Port: port,
-	}
-}
-
-func port(v *uint32) uint16 {
-	p := (*[4]byte)(unsafe.Pointer(v))
-	return binary.BigEndian.Uint16(p[:2])
-}

net/tsaddr/tsaddr.go

@@ -30,11 +30,7 @@ func CGNATRange() netaddr.IPPrefix {
 	return cgnatRange.v
 }
 
-var (
-	cgnatRange   oncePrefix
-	ulaRange     oncePrefix
-	ula4To6Range oncePrefix
-)
+var cgnatRange oncePrefix
 
 // TailscaleServiceIP returns the listen address of services
 // provided by Tailscale itself such as the Magic DNS proxy.
@@ -48,40 +44,7 @@ var serviceIP onceIP
 // IsTailscaleIP reports whether ip is an IP address in a range that
 // Tailscale assigns from.
 func IsTailscaleIP(ip netaddr.IP) bool {
-	if ip.Is4() {
-		return CGNATRange().Contains(ip) && !ChromeOSVMRange().Contains(ip)
-	}
-	return TailscaleULARange().Contains(ip)
-}
-
-// TailscaleULARange returns the IPv6 Unique Local Address range that
-// is the superset range that Tailscale assigns out of.
-func TailscaleULARange() netaddr.IPPrefix {
-	ulaRange.Do(func() { mustPrefix(&ulaRange.v, "fd7a:115c:a1e0::/48") })
-	return ulaRange.v
-}
-
-// Tailscale4To6Range returns the subset of TailscaleULARange used for
-// auto-translated Tailscale ipv4 addresses.
-func Tailscale4To6Range() netaddr.IPPrefix {
-	// This IP range has no significance, beyond being a subset of
-	// TailscaleULARange. The bits from /48 to /104 were picked at
-	// random.
-	ula4To6Range.Do(func() { mustPrefix(&ula4To6Range.v, "fd7a:115c:a1e0:ab12:4843:cd96:6200::/104") })
-	return ula4To6Range.v
-}
-
-// Tailscale4To6 returns a Tailscale IPv6 address that maps 1:1 to the
-// given Tailscale IPv4 address. Returns a zero IP if ipv4 isn't a
-// Tailscale IPv4 address.
-func Tailscale4To6(ipv4 netaddr.IP) netaddr.IP {
-	if !ipv4.Is4() || !IsTailscaleIP(ipv4) {
-		return netaddr.IP{}
-	}
-	ret := Tailscale4To6Range().IP.As16()
-	v4 := ipv4.As4()
-	copy(ret[13:], v4[1:])
-	return netaddr.IPFrom16(ret)
+	return CGNATRange().Contains(ip) && !ChromeOSVMRange().Contains(ip)
 }
 
 func mustPrefix(v *netaddr.IPPrefix, prefix string) {

net/tshttpproxy/tshttpproxy.go

@@ -10,45 +10,14 @@ import (
 	"net/http"
 	"net/url"
 	"os"
-	"sync"
-	"time"
 )
 
-// InvalidateCache invalidates the package-level cache for ProxyFromEnvironment.
-//
-// It's intended to be called on network link/routing table changes.
-func InvalidateCache() {
-	mu.Lock()
-	defer mu.Unlock()
-	noProxyUntil = time.Time{}
-}
-
-var (
-	mu           sync.Mutex
-	noProxyUntil time.Time // if non-zero, time at which ProxyFromEnvironment should check again
-)
-
-func setNoProxyUntil(d time.Duration) {
-	mu.Lock()
-	defer mu.Unlock()
-	noProxyUntil = time.Now().Add(d)
-}
-
-var _ = setNoProxyUntil // quiet staticcheck; Windows uses the above, more might later
-
 // sysProxyFromEnv, if non-nil, specifies a platform-specific ProxyFromEnvironment
 // func to use if http.ProxyFromEnvironment doesn't return a proxy.
 // For example, WPAD PAC files on Windows.
 var sysProxyFromEnv func(*http.Request) (*url.URL, error)
 
 func ProxyFromEnvironment(req *http.Request) (*url.URL, error) {
-	mu.Lock()
-	noProxyTime := noProxyUntil
-	mu.Unlock()
-	if time.Now().Before(noProxyTime) {
-		return nil, nil
-	}
-
 	u, err := http.ProxyFromEnvironment(req)
 	if u != nil && err == nil {
 		return u, nil

net/tshttpproxy/tshttpproxy_windows.go

@@ -19,7 +19,6 @@ import (
 
 	"github.com/alexbrainman/sspi/negotiate"
 	"golang.org/x/sys/windows"
-	"tailscale.com/types/logger"
 )
 
 var (
@@ -39,13 +38,6 @@ var cachedProxy struct {
 	val *url.URL
 }
 
-// proxyErrorf is a rate-limited logger specifically for errors asking
-// WinHTTP for the proxy information. We don't want to log about
-// errors often, otherwise the log message itself will generate a new
-// HTTP request which ultimately will call back into us to log again,
-// forever. So for errors, we only log a bit.
-var proxyErrorf = logger.RateLimitedFn(log.Printf, 10*time.Minute, 2 /* burst*/, 10 /* maxCache */)
-
 func proxyFromWinHTTPOrCache(req *http.Request) (*url.URL, error) {
 	if req.URL == nil {
 		return nil, nil
@@ -79,31 +71,16 @@ func proxyFromWinHTTPOrCache(req *http.Request) (*url.URL, error) {
 		}
 
 		// See https://docs.microsoft.com/en-us/windows/win32/winhttp/error-messages
-		const (
-			ERROR_WINHTTP_AUTODETECTION_FAILED      = 12180
-			ERROR_WINHTTP_UNABLE_TO_DOWNLOAD_SCRIPT = 12167
-		)
+		const ERROR_WINHTTP_AUTODETECTION_FAILED = 12180
 		if err == syscall.Errno(ERROR_WINHTTP_AUTODETECTION_FAILED) {
-			setNoProxyUntil(10 * time.Second)
-			return nil, nil
-		}
-		if err == windows.ERROR_INVALID_PARAMETER {
-			// Seen on Windows 8.1. (https://github.com/tailscale/tailscale/issues/879)
-			// TODO(bradfitz): figure this out.
-			setNoProxyUntil(time.Hour)
-			proxyErrorf("tshttpproxy: winhttp: GetProxyForURL(%q): ERROR_INVALID_PARAMETER [unexpected]", urlStr)
-			return nil, nil
-		}
-		proxyErrorf("tshttpproxy: winhttp: GetProxyForURL(%q): %v/%#v", urlStr, err, err)
-		if err == syscall.Errno(ERROR_WINHTTP_UNABLE_TO_DOWNLOAD_SCRIPT) {
-			setNoProxyUntil(10 * time.Second)
 			return nil, nil
 		}
+		log.Printf("tshttpproxy: winhttp: GetProxyForURL(%q): %v/%#v", urlStr, err, err)
 		return nil, err
 	case <-ctx.Done():
 		cachedProxy.Lock()
 		defer cachedProxy.Unlock()
-		proxyErrorf("tshttpproxy: winhttp: GetProxyForURL(%q): timeout; using cached proxy %v", urlStr, cachedProxy.val)
+		log.Printf("tshttpproxy: winhttp: GetProxyForURL(%q): timeout; using cached proxy %v", urlStr, cachedProxy.val)
 		return cachedProxy.val, nil
 	}
 }
@@ -111,7 +88,7 @@ func proxyFromWinHTTPOrCache(req *http.Request) (*url.URL, error) {
 func proxyFromWinHTTP(ctx context.Context, urlStr string) (proxy *url.URL, err error) {
 	whi, err := winHTTPOpen()
 	if err != nil {
-		proxyErrorf("winhttp: Open: %v", err)
+		log.Printf("winhttp: Open: %v", err)
 		return nil, err
 	}
 	defer whi.Close()

portlist/portlist_windows.go

@@ -8,7 +8,6 @@ import (
 	"syscall"
 	"time"
 
-	"golang.org/x/sys/windows"
 	exec "tailscale.com/tempfork/osexec"
 )
 
@@ -20,9 +19,6 @@ func listPorts() (List, error) {
 }
 
 func addProcesses(pl []Port) ([]Port, error) {
-	if t := windows.GetCurrentProcessToken(); !t.IsElevated() {
-		return listPortsNetstat("-na")
-	}
 	return listPortsNetstat("-nab")
 }
 

scripts/check_license_headers.sh

@@ -30,7 +30,7 @@ if [ $# != 1 ]; then
 fi
 
 fail=0
-for file in $(find $1 -name '*.go' -not -path '*/.git/*'); do
+for file in $(find $1 -name '*.go'); do
     case $file in
         $1/tempfork/*)
             # Skip, tempfork of third-party code

syncs/locked.go

@@ -1,58 +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.
-
-// +build go1.13,!go1.16
-
-// This file makes assumptions about the inner workings of sync.Mutex and sync.RWMutex.
-// This includes not just their memory layout but their invariants and functionality.
-// To prevent accidents, it is limited to a known good subset of Go versions.
-
-package syncs
-
-import (
-	"sync"
-	"sync/atomic"
-	"unsafe"
-)
-
-const (
-	mutexLocked = 1
-
-	// sync.Mutex field offsets
-	stateOffset = 0
-
-	// sync.RWMutext field offsets
-	mutexOffset       = 0
-	readerCountOffset = 16
-)
-
-// add returns a pointer with value p + off.
-func add(p unsafe.Pointer, off uintptr) unsafe.Pointer {
-	return unsafe.Pointer(uintptr(p) + off)
-}
-
-// AssertLocked panics if m is not locked.
-func AssertLocked(m *sync.Mutex) {
-	p := add(unsafe.Pointer(m), stateOffset)
-	if atomic.LoadInt32((*int32)(p))&mutexLocked == 0 {
-		panic("mutex is not locked")
-	}
-}
-
-// AssertRLocked panics if rw is not locked for reading or writing.
-func AssertRLocked(rw *sync.RWMutex) {
-	p := add(unsafe.Pointer(rw), readerCountOffset)
-	if atomic.LoadInt32((*int32)(p)) != 0 {
-		// There are readers present or writers pending, so someone has a read lock.
-		return
-	}
-	// No readers.
-	AssertWLocked(rw)
-}
-
-// AssertWLocked panics if rw is not locked for writing.
-func AssertWLocked(rw *sync.RWMutex) {
-	m := (*sync.Mutex)(add(unsafe.Pointer(rw), mutexOffset))
-	AssertLocked(m)
-}

syncs/locked_test.go

@@ -1,123 +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.
-
-// +build go1.13,!go1.16
-
-//lint:file-ignore SA2001 the empty critical sections are part of triggering different internal mutex states
-
-package syncs
-
-import (
-	"sync"
-	"testing"
-	"time"
-)
-
-func wantPanic(t *testing.T, fn func()) {
-	t.Helper()
-	defer func() {
-		recover()
-	}()
-	fn()
-	t.Fatal("failed to panic")
-}
-
-func TestAssertLocked(t *testing.T) {
-	m := new(sync.Mutex)
-	wantPanic(t, func() { AssertLocked(m) })
-	m.Lock()
-	AssertLocked(m)
-	m.Unlock()
-	wantPanic(t, func() { AssertLocked(m) })
-	// Test correct handling of mutex with waiter.
-	m.Lock()
-	AssertLocked(m)
-	go func() {
-		m.Lock()
-		m.Unlock()
-	}()
-	// Give the goroutine above a few moments to get started.
-	// The test will pass whether or not we win the race,
-	// but we want to run sometimes, to get the test coverage.
-	time.Sleep(10 * time.Millisecond)
-	AssertLocked(m)
-}
-
-func TestAssertWLocked(t *testing.T) {
-	m := new(sync.RWMutex)
-	wantPanic(t, func() { AssertWLocked(m) })
-	m.Lock()
-	AssertWLocked(m)
-	m.Unlock()
-	wantPanic(t, func() { AssertWLocked(m) })
-	// Test correct handling of mutex with waiter.
-	m.Lock()
-	AssertWLocked(m)
-	go func() {
-		m.Lock()
-		m.Unlock()
-	}()
-	// Give the goroutine above a few moments to get started.
-	// The test will pass whether or not we win the race,
-	// but we want to run sometimes, to get the test coverage.
-	time.Sleep(10 * time.Millisecond)
-	AssertWLocked(m)
-}
-
-func TestAssertRLocked(t *testing.T) {
-	m := new(sync.RWMutex)
-	wantPanic(t, func() { AssertRLocked(m) })
-
-	m.Lock()
-	AssertRLocked(m)
-	m.Unlock()
-
-	m.RLock()
-	AssertRLocked(m)
-	m.RUnlock()
-
-	wantPanic(t, func() { AssertRLocked(m) })
-
-	// Test correct handling of mutex with waiter.
-	m.RLock()
-	AssertRLocked(m)
-	go func() {
-		m.RLock()
-		m.RUnlock()
-	}()
-	// Give the goroutine above a few moments to get started.
-	// The test will pass whether or not we win the race,
-	// but we want to run sometimes, to get the test coverage.
-	time.Sleep(10 * time.Millisecond)
-	AssertRLocked(m)
-	m.RUnlock()
-
-	// Test correct handling of rlock with write waiter.
-	m.RLock()
-	AssertRLocked(m)
-	go func() {
-		m.Lock()
-		m.Unlock()
-	}()
-	// Give the goroutine above a few moments to get started.
-	// The test will pass whether or not we win the race,
-	// but we want to run sometimes, to get the test coverage.
-	time.Sleep(10 * time.Millisecond)
-	AssertRLocked(m)
-	m.RUnlock()
-
-	// Test correct handling of rlock with other rlocks.
-	// This is a bit racy, but losing the race hurts nothing,
-	// and winning the race means correct test coverage.
-	m.RLock()
-	AssertRLocked(m)
-	go func() {
-		m.RLock()
-		time.Sleep(10 * time.Millisecond)
-		m.RUnlock()
-	}()
-	time.Sleep(5 * time.Millisecond)
-	AssertRLocked(m)
-	m.RUnlock()
-}

syncs/syncs.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 syncs contains additional sync types and functionality.
+// Package syncs contains addition sync types.
 package syncs
 
 import "sync/atomic"

syncs/watchdog.go

@@ -1,95 +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.
-
-package syncs
-
-import (
-	"context"
-	"sync"
-	"time"
-)
-
-// Watch monitors mu for contention.
-// On first call, and at every tick, Watch locks and unlocks mu.
-// (Tick should be large to avoid adding contention to mu.)
-// Max is the maximum length of time Watch will wait to acquire the lock.
-// The time required to lock mu is sent on the returned channel.
-// Watch exits when ctx is done, and closes the returned channel.
-func Watch(ctx context.Context, mu sync.Locker, tick, max time.Duration) chan time.Duration {
-	// Set up the return channel.
-	c := make(chan time.Duration)
-	var (
-		closemu sync.Mutex
-		closed  bool
-	)
-	sendc := func(d time.Duration) {
-		closemu.Lock()
-		defer closemu.Unlock()
-		if closed {
-			// Drop values written after c is closed.
-			return
-		}
-		c <- d
-	}
-	closec := func() {
-		closemu.Lock()
-		defer closemu.Unlock()
-		close(c)
-		closed = true
-	}
-
-	// check locks the mutex and writes how long it took to c.
-	// check returns ~immediately.
-	check := func() {
-		// Start a race between two goroutines.
-		// One locks the mutex; the other times out.
-		// Ensure that only one of the two gets to write its result.
-		// Since the common case is that locking the mutex is fast,
-		// let the timeout goroutine exit early when that happens.
-		var sendonce sync.Once
-		done := make(chan bool)
-		go func() {
-			start := time.Now()
-			mu.Lock()
-			mu.Unlock() //lint:ignore SA2001 ignore the empty critical section
-			elapsed := time.Since(start)
-			if elapsed > max {
-				elapsed = max
-			}
-			close(done)
-			sendonce.Do(func() { sendc(elapsed) })
-		}()
-		go func() {
-			select {
-			case <-time.After(max):
-				// the other goroutine may not have sent a value
-				sendonce.Do(func() { sendc(max) })
-			case <-done:
-				// the other goroutine sent a value
-			}
-		}()
-	}
-
-	// Check once at startup.
-	// This is mainly to make testing easier.
-	check()
-
-	// Start the watchdog goroutine.
-	// It checks the mutex every tick, until ctx is done.
-	go func() {
-		ticker := time.NewTicker(tick)
-		for {
-			select {
-			case <-ctx.Done():
-				closec()
-				ticker.Stop()
-				return
-			case <-ticker.C:
-				check()
-			}
-		}
-	}()
-
-	return c
-}

syncs/watchdog_test.go

@@ -1,71 +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.
-
-package syncs
-
-import (
-	"context"
-	"sync"
-	"testing"
-	"time"
-)
-
-// Time-based tests are fundamentally flaky.
-// We use exaggerated durations in the hopes of minimizing such issues.
-
-func TestWatchUncontended(t *testing.T) {
-	mu := new(sync.Mutex)
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-	// Once an hour, and now, check whether we can lock mu in under an hour.
-	tick := time.Hour
-	max := time.Hour
-	c := Watch(ctx, mu, tick, max)
-	d := <-c
-	if d == max {
-		t.Errorf("uncontended mutex did not lock in under %v", max)
-	}
-}
-
-func TestWatchContended(t *testing.T) {
-	mu := new(sync.Mutex)
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel()
-	// Every hour, and now, check whether we can lock mu in under a millisecond,
-	// which is enough time for an uncontended mutex by several orders of magnitude.
-	tick := time.Hour
-	max := time.Millisecond
-	mu.Lock()
-	defer mu.Unlock()
-	c := Watch(ctx, mu, tick, max)
-	d := <-c
-	if d != max {
-		t.Errorf("contended mutex locked in under %v", max)
-	}
-}
-
-func TestWatchMultipleValues(t *testing.T) {
-	mu := new(sync.Mutex)
-	ctx, cancel := context.WithCancel(context.Background())
-	defer cancel() // not necessary, but keep vet happy
-	// Check the mutex every millisecond.
-	// The goal is to see that we get a sufficient number of values out of the channel.
-	tick := time.Millisecond
-	max := time.Millisecond
-	c := Watch(ctx, mu, tick, max)
-	start := time.Now()
-	n := 0
-	for d := range c {
-		n++
-		if d == max {
-			t.Errorf("uncontended mutex did not lock in under %v", max)
-		}
-		if n == 10 {
-			cancel()
-		}
-	}
-	if elapsed := time.Since(start); elapsed > 100*time.Millisecond {
-		t.Errorf("expected 1 event per millisecond, got only %v events in %v", n, elapsed)
-	}
-}

tailcfg/tailcfg.go

@@ -4,7 +4,7 @@
 
 package tailcfg
 
-//go:generate go run tailscale.com/cmd/cloner --type=User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse --clonefunc=true --output=tailcfg_clone.go
+//go:generate go run tailscale.com/cmd/cloner -type=User,Node,Hostinfo,NetInfo,Group,Role,Capability -output=tailcfg_clone.go
 
 import (
 	"bytes"
@@ -13,7 +13,6 @@ import (
 	"reflect"
 	"strings"
 	"time"
-	"unicode/utf8"
 
 	"github.com/tailscale/wireguard-go/wgcfg"
 	"go4.org/mem"
@@ -28,34 +27,14 @@ type ID int64
 
 type UserID ID
 
-func (u UserID) IsZero() bool {
-	return u == 0
-}
-
 type LoginID ID
 
-func (u LoginID) IsZero() bool {
-	return u == 0
-}
-
 type NodeID ID
 
-func (u NodeID) IsZero() bool {
-	return u == 0
-}
-
 type GroupID ID
 
-func (u GroupID) IsZero() bool {
-	return u == 0
-}
-
 type RoleID ID
 
-func (u RoleID) IsZero() bool {
-	return u == 0
-}
-
 type CapabilityID ID
 
 // MachineKey is the curve25519 public key for a machine.
@@ -135,7 +114,7 @@ type UserProfile struct {
 	LoginName     string // "alice@smith.com"; for display purposes only (provider is not listed)
 	DisplayName   string // "Alice Smith"
 	ProfilePicURL string
-	Roles         []RoleID // deprecated; clients should not rely on Roles
+	Roles         []RoleID
 }
 
 type Node struct {
@@ -211,8 +190,13 @@ func (m MachineStatus) String() string {
 	}
 }
 
-func isNum(r rune) bool   { return r >= '0' && r <= '9' }
-func isAlpha(r rune) bool { return (r >= 'A' && r <= 'Z') || (r >= 'a' && r <= 'z') }
+func isNum(b byte) bool {
+	return b >= '0' && b <= '9'
+}
+
+func isAlpha(b byte) bool {
+	return (b >= 'A' && b <= 'Z') || (b >= 'a' && b <= 'z')
+}
 
 // CheckTag valids whether a given string can be used as an ACL tag.
 // For now we allow only ascii alphanumeric tags, and they need to start
@@ -227,34 +211,20 @@ func CheckTag(tag string) error {
 	if !strings.HasPrefix(tag, "tag:") {
 		return errors.New("tags must start with 'tag:'")
 	}
-	suffix := tag[len("tag:"):]
-	if err := CheckTagSuffix(suffix); err != nil {
-		return fmt.Errorf("invalid tag %q: %w", tag, err)
-	}
-	return nil
-}
-
-// CheckTagSuffix checks whether tag is a valid tag suffix (the part
-// appearing after "tag:"). The error message does not reference
-// "tag:", so it's suitable for use by the "tailscale up" CLI tool
-// where the "tag:" isn't required. The returned error also does not
-// reference the tag itself, so the caller can wrap it as needed with
-// either the full or short form.
-func CheckTagSuffix(tag string) error {
+	tag = tag[4:]
 	if tag == "" {
 		return errors.New("tag names must not be empty")
 	}
-	if i := strings.IndexFunc(tag, func(r rune) bool { return r >= utf8.RuneSelf }); i != -1 {
-		return errors.New("tag names must only contain ASCII")
+	if !isAlpha(tag[0]) {
+		return errors.New("tag names must start with a letter, after 'tag:'")
 	}
-	if !isAlpha(rune(tag[0])) {
-		return errors.New("tag name must start with a letter")
-	}
-	for _, r := range tag {
-		if !isNum(r) && !isAlpha(r) && r != '-' {
+
+	for _, b := range []byte(tag) {
+		if !isNum(b) && !isAlpha(b) && b != '-' {
 			return errors.New("tag names can only contain numbers, letters, or dashes")
 		}
 	}
+
 	return nil
 }
 
@@ -269,7 +239,7 @@ type Service struct {
 	_           structs.Incomparable
 	Proto       ServiceProto // TCP or UDP
 	Port        uint16       // port number service is listening on
-	Description string       `json:",omitempty"` // text description of service
+	Description string       // text description of service
 	// TODO(apenwarr): allow advertising services on subnet IPs?
 	// TODO(apenwarr): add "tags" here for each service?
 
@@ -285,13 +255,13 @@ type Hostinfo struct {
 	// TODO(crawshaw): mark all these fields ",omitempty" when all the
 	// iOS apps are updated with the latest swift version of this struct.
 	IPNVersion    string       // version of this code
-	FrontendLogID string       `json:",omitempty"` // logtail ID of frontend instance
-	BackendLogID  string       `json:",omitempty"` // logtail ID of backend instance
+	FrontendLogID string       // logtail ID of frontend instance
+	BackendLogID  string       // logtail ID of backend instance
 	OS            string       // operating system the client runs on (a version.OS value)
-	OSVersion     string       `json:",omitempty"` // operating system version, with optional distro prefix ("Debian 10.4", "Windows 10 Pro 10.0.19041")
-	DeviceModel   string       `json:",omitempty"` // mobile phone model ("Pixel 3a", "iPhone 11 Pro")
+	OSVersion     string       // operating system version, with optional distro prefix ("Debian 10.4", "Windows 10 Pro 10.0.19041")
+	DeviceModel   string       // mobile phone model ("Pixel 3a", "iPhone 11 Pro")
 	Hostname      string       // name of the host the client runs on
-	GoArch        string       `json:",omitempty"` // the host's GOARCH value (of the running binary)
+	GoArch        string       // the host's GOARCH value (of the running binary)
 	RoutableIPs   []wgcfg.CIDR `json:",omitempty"` // set of IP ranges this client can route
 	RequestTags   []string     `json:",omitempty"` // set of ACL tags this node wants to claim
 	Services      []Service    `json:",omitempty"` // services advertised by this machine
@@ -338,7 +308,7 @@ type NetInfo struct {
 	PreferredDERP int
 
 	// LinkType is the current link type, if known.
-	LinkType string `json:",omitempty"` // "wired", "wifi", "mobile" (LTE, 4G, 3G, etc)
+	LinkType string // "wired", "wifi", "mobile" (LTE, 4G, 3G, etc)
 
 	// DERPLatency is the fastest recent time to reach various
 	// DERP STUN servers, in seconds. The map key is the
@@ -471,51 +441,22 @@ type RegisterResponse struct {
 // using the local machine key, and sent to:
 //	https://login.tailscale.com/machine/<mkey hex>/map
 type MapRequest struct {
-	// Version is incremented whenever the client code changes enough that
-	// we want to signal to the control server that we're capable of something
-	// different.
-	//
-	// History of versions:
-	//     3: implicit compression, keep-alives
-	//     4: opt-in keep-alives via KeepAlive field, opt-in compression via Compress
-	//     5: 2020-10-19, implies IncludeIPv6, DeltaPeers/DeltaUserProfiles, supports MagicDNS
-	Version     int
+	Version     int    // current version is 4
 	Compress    string // "zstd" or "" (no compression)
 	KeepAlive   bool   // whether server should send keep-alives back to us
 	NodeKey     NodeKey
 	DiscoKey    DiscoKey
 	Endpoints   []string // caller's endpoints (IPv4 or IPv6)
-	IncludeIPv6 bool     `json:",omitempty"` // include IPv6 endpoints in returned Node Endpoints (for Version 4 clients)
+	IncludeIPv6 bool     // include IPv6 endpoints in returned Node Endpoints
+	DeltaPeers  bool     // whether the 2nd+ network map in response should be deltas, using PeersChanged, PeersRemoved
 	Stream      bool     // if true, multiple MapResponse objects are returned
 	Hostinfo    *Hostinfo
 
-	// ReadOnly is whether the client just wants to fetch the
-	// MapResponse, without updating their Endpoints. The
-	// Endpoints field will be ignored and LastSeen will not be
-	// updated and peers will not be notified of changes.
-	//
-	// The intended use is for clients to discover the DERP map at
-	// start-up before their first real endpoint update.
-	ReadOnly bool `json:",omitempty"`
-
-	// OmitPeers is whether the client is okay with the Peers list
-	// being omitted in the response. (For example, a client on
-	// start up using ReadOnly to get the DERP map.)
-	OmitPeers bool `json:",omitempty"`
-
-	// DebugFlags is a list of strings specifying debugging and
-	// development features to enable in handling this map
-	// request. The values are deliberately unspecified, as they get
-	// added and removed all the time during development, and offer no
-	// compatibility promise. To roll out semantic changes, bump
-	// Version instead.
-	//
-	// Current DebugFlags values are:
-	//     * "warn-ip-forwarding-off": client is trying to be a subnet
-	//       router but their IP forwarding is broken.
-	//     * "v6-overlay": IPv6 development flag to have control send
-	//       v6 node addrs
-	DebugFlags []string `json:",omitempty"`
+	// DebugForceDisco is a temporary flag during the deployment
+	// of magicsock active discovery. It says that that the client
+	// has environment variables explicitly turning discovery on,
+	// so control should not disable it.
+	DebugForceDisco bool `json:"debugForceDisco,omitempty"`
 }
 
 // PortRange represents a range of UDP or TCP port numbers.
@@ -529,23 +470,23 @@ var PortRangeAny = PortRange{0, 65535}
 // NetPortRange represents a single subnet:portrange.
 type NetPortRange struct {
 	_     structs.Incomparable
-	IP    string // "*" means all
-	Bits  *int   // backward compatibility: if missing, means "all" bits
+	IP    string
+	Bits  *int // backward compatibility: if missing, means "all" bits
 	Ports PortRange
 }
 
 // FilterRule represents one rule in a packet filter.
 type FilterRule struct {
-	SrcIPs   []string // "*" means all
+	SrcIPs   []string
 	SrcBits  []int
 	DstPorts []NetPortRange
 }
 
 var FilterAllowAll = []FilterRule{
-	{
+	FilterRule{
 		SrcIPs:  []string{"*"},
 		SrcBits: nil,
-		DstPorts: []NetPortRange{{
+		DstPorts: []NetPortRange{NetPortRange{
 			IP:    "*",
 			Bits:  nil,
 			Ports: PortRange{0, 65535},
@@ -604,8 +545,8 @@ type MapResponse struct {
 	// ACLs
 	Domain       string
 	PacketFilter []FilterRule
-	UserProfiles []UserProfile // as of 1.1.541: may be new or updated user profiles only
-	Roles        []Role        // deprecated; clients should not rely on Roles
+	UserProfiles []UserProfile
+	Roles        []Role
 	// TODO: Groups       []Group
 	// TODO: Capabilities []Capability
 
@@ -645,7 +586,6 @@ type Debug struct {
 
 func (k MachineKey) String() string                   { return fmt.Sprintf("mkey:%x", k[:]) }
 func (k MachineKey) MarshalText() ([]byte, error)     { return keyMarshalText("mkey:", k), nil }
-func (k MachineKey) HexString() string                { return fmt.Sprintf("%x", k[:]) }
 func (k *MachineKey) UnmarshalText(text []byte) error { return keyUnmarshalText(k[:], "mkey:", text) }
 
 func keyMarshalText(prefix string, k [32]byte) []byte {
@@ -675,9 +615,6 @@ func (k *NodeKey) UnmarshalText(text []byte) error { return keyUnmarshalText(k[:
 // IsZero reports whether k is the zero value.
 func (k NodeKey) IsZero() bool { return k == NodeKey{} }
 
-// IsZero reports whether k is the zero value.
-func (k MachineKey) IsZero() bool { return k == MachineKey{} }
-
 func (k DiscoKey) String() string                   { return fmt.Sprintf("discokey:%x", k[:]) }
 func (k DiscoKey) MarshalText() ([]byte, error)     { return keyMarshalText("discokey:", k), nil }
 func (k *DiscoKey) UnmarshalText(text []byte) error { return keyUnmarshalText(k[:], "discokey:", text) }

tailcfg/tailcfg_clone.go

@@ -2,15 +2,11 @@
 // 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 -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse; DO NOT EDIT.
+// Code generated by tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability; DO NOT EDIT.
 
 package tailcfg
 
 import (
-	"github.com/tailscale/wireguard-go/wgcfg"
-	"inet.af/netaddr"
-	"tailscale.com/types/opt"
-	"tailscale.com/types/structs"
 	"time"
 )
 
@@ -27,19 +23,6 @@ func (src *User) Clone() *User {
 	return dst
 }
 
-// A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
-var _UserNeedsRegeneration = User(struct {
-	ID            UserID
-	LoginName     string
-	DisplayName   string
-	ProfilePicURL string
-	Domain        string
-	Logins        []LoginID
-	Roles         []RoleID
-	Created       time.Time
-}{})
-
 // Clone makes a deep copy of Node.
 // The result aliases no memory with the original.
 func (src *Node) Clone() *Node {
@@ -59,27 +42,6 @@ func (src *Node) Clone() *Node {
 	return dst
 }
 
-// A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
-var _NodeNeedsRegeneration = Node(struct {
-	ID                NodeID
-	Name              string
-	User              UserID
-	Key               NodeKey
-	KeyExpiry         time.Time
-	Machine           MachineKey
-	DiscoKey          DiscoKey
-	Addresses         []wgcfg.CIDR
-	AllowedIPs        []wgcfg.CIDR
-	Endpoints         []string
-	DERP              string
-	Hostinfo          Hostinfo
-	Created           time.Time
-	LastSeen          *time.Time
-	KeepAlive         bool
-	MachineAuthorized bool
-}{})
-
 // Clone makes a deep copy of Hostinfo.
 // The result aliases no memory with the original.
 func (src *Hostinfo) Clone() *Hostinfo {
@@ -95,23 +57,6 @@ func (src *Hostinfo) Clone() *Hostinfo {
 	return dst
 }
 
-// A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
-var _HostinfoNeedsRegeneration = Hostinfo(struct {
-	IPNVersion    string
-	FrontendLogID string
-	BackendLogID  string
-	OS            string
-	OSVersion     string
-	DeviceModel   string
-	Hostname      string
-	GoArch        string
-	RoutableIPs   []wgcfg.CIDR
-	RequestTags   []string
-	Services      []Service
-	NetInfo       *NetInfo
-}{})
-
 // Clone makes a deep copy of NetInfo.
 // The result aliases no memory with the original.
 func (src *NetInfo) Clone() *NetInfo {
@@ -129,21 +74,6 @@ func (src *NetInfo) Clone() *NetInfo {
 	return dst
 }
 
-// A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
-var _NetInfoNeedsRegeneration = NetInfo(struct {
-	MappingVariesByDestIP opt.Bool
-	HairPinning           opt.Bool
-	WorkingIPv6           opt.Bool
-	WorkingUDP            opt.Bool
-	UPnP                  opt.Bool
-	PMP                   opt.Bool
-	PCP                   opt.Bool
-	PreferredDERP         int
-	LinkType              string
-	DERPLatency           map[string]float64
-}{})
-
 // Clone makes a deep copy of Group.
 // The result aliases no memory with the original.
 func (src *Group) Clone() *Group {
@@ -156,14 +86,6 @@ func (src *Group) Clone() *Group {
 	return dst
 }
 
-// A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
-var _GroupNeedsRegeneration = Group(struct {
-	ID      GroupID
-	Name    string
-	Members []ID
-}{})
-
 // Clone makes a deep copy of Role.
 // The result aliases no memory with the original.
 func (src *Role) Clone() *Role {
@@ -176,14 +98,6 @@ func (src *Role) Clone() *Role {
 	return dst
 }
 
-// A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
-var _RoleNeedsRegeneration = Role(struct {
-	ID           RoleID
-	Name         string
-	Capabilities []CapabilityID
-}{})
-
 // Clone makes a deep copy of Capability.
 // The result aliases no memory with the original.
 func (src *Capability) Clone() *Capability {
@@ -194,177 +108,3 @@ func (src *Capability) Clone() *Capability {
 	*dst = *src
 	return dst
 }
-
-// A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
-var _CapabilityNeedsRegeneration = Capability(struct {
-	ID   CapabilityID
-	Type CapType
-	Val  ID
-}{})
-
-// Clone makes a deep copy of Login.
-// The result aliases no memory with the original.
-func (src *Login) Clone() *Login {
-	if src == nil {
-		return nil
-	}
-	dst := new(Login)
-	*dst = *src
-	return dst
-}
-
-// A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
-var _LoginNeedsRegeneration = Login(struct {
-	_             structs.Incomparable
-	ID            LoginID
-	Provider      string
-	LoginName     string
-	DisplayName   string
-	ProfilePicURL string
-	Domain        string
-}{})
-
-// Clone makes a deep copy of DNSConfig.
-// The result aliases no memory with the original.
-func (src *DNSConfig) Clone() *DNSConfig {
-	if src == nil {
-		return nil
-	}
-	dst := new(DNSConfig)
-	*dst = *src
-	dst.Nameservers = append(src.Nameservers[:0:0], src.Nameservers...)
-	dst.Domains = append(src.Domains[:0:0], src.Domains...)
-	return dst
-}
-
-// A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
-var _DNSConfigNeedsRegeneration = DNSConfig(struct {
-	Nameservers []netaddr.IP
-	Domains     []string
-	PerDomain   bool
-	Proxied     bool
-}{})
-
-// Clone makes a deep copy of RegisterResponse.
-// The result aliases no memory with the original.
-func (src *RegisterResponse) Clone() *RegisterResponse {
-	if src == nil {
-		return nil
-	}
-	dst := new(RegisterResponse)
-	*dst = *src
-	dst.User = *src.User.Clone()
-	return dst
-}
-
-// A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
-var _RegisterResponseNeedsRegeneration = RegisterResponse(struct {
-	User              User
-	Login             Login
-	NodeKeyExpired    bool
-	MachineAuthorized bool
-	AuthURL           string
-}{})
-
-// Clone duplicates src into dst and reports whether it succeeded.
-// To succeed, <src, dst> must be of types <*T, *T> or <*T, **T>,
-// where T is one of User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse.
-func Clone(dst, src interface{}) bool {
-	switch src := src.(type) {
-	case *User:
-		switch dst := dst.(type) {
-		case *User:
-			*dst = *src.Clone()
-			return true
-		case **User:
-			*dst = src.Clone()
-			return true
-		}
-	case *Node:
-		switch dst := dst.(type) {
-		case *Node:
-			*dst = *src.Clone()
-			return true
-		case **Node:
-			*dst = src.Clone()
-			return true
-		}
-	case *Hostinfo:
-		switch dst := dst.(type) {
-		case *Hostinfo:
-			*dst = *src.Clone()
-			return true
-		case **Hostinfo:
-			*dst = src.Clone()
-			return true
-		}
-	case *NetInfo:
-		switch dst := dst.(type) {
-		case *NetInfo:
-			*dst = *src.Clone()
-			return true
-		case **NetInfo:
-			*dst = src.Clone()
-			return true
-		}
-	case *Group:
-		switch dst := dst.(type) {
-		case *Group:
-			*dst = *src.Clone()
-			return true
-		case **Group:
-			*dst = src.Clone()
-			return true
-		}
-	case *Role:
-		switch dst := dst.(type) {
-		case *Role:
-			*dst = *src.Clone()
-			return true
-		case **Role:
-			*dst = src.Clone()
-			return true
-		}
-	case *Capability:
-		switch dst := dst.(type) {
-		case *Capability:
-			*dst = *src.Clone()
-			return true
-		case **Capability:
-			*dst = src.Clone()
-			return true
-		}
-	case *Login:
-		switch dst := dst.(type) {
-		case *Login:
-			*dst = *src.Clone()
-			return true
-		case **Login:
-			*dst = src.Clone()
-			return true
-		}
-	case *DNSConfig:
-		switch dst := dst.(type) {
-		case *DNSConfig:
-			*dst = *src.Clone()
-			return true
-		case **DNSConfig:
-			*dst = src.Clone()
-			return true
-		}
-	case *RegisterResponse:
-		switch dst := dst.(type) {
-		case *RegisterResponse:
-			*dst = *src.Clone()
-			return true
-		case **RegisterResponse:
-			*dst = src.Clone()
-			return true
-		}
-	}
-	return false
-}

tempfork/osexec/lp_unix_test.go

@@ -7,12 +7,17 @@
 package exec
 
 import (
+	"io/ioutil"
 	"os"
 	"testing"
 )
 
 func TestLookPathUnixEmptyPath(t *testing.T) {
-	tmp := t.TempDir()
+	tmp, err := ioutil.TempDir("", "TestLookPathUnixEmptyPath")
+	if err != nil {
+		t.Fatal("TempDir failed: ", err)
+	}
+	defer os.RemoveAll(tmp)
 	wd, err := os.Getwd()
 	if err != nil {
 		t.Fatal("Getwd failed: ", err)

tsconst/interface.go

@@ -1,11 +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.
-
-// Package tsconst exports some constants used elsewhere in the
-// codebase.
-package tsconst
-
-// WintunInterfaceDesc is the description attached to Tailscale
-// interfaces on Windows. This is set by our modified WinTun driver.
-const WintunInterfaceDesc = "Tailscale Tunnel"

tstest/log.go

@@ -5,8 +5,6 @@
 package tstest
 
 import (
-	"bytes"
-	"fmt"
 	"log"
 	"os"
 	"sync"
@@ -37,16 +35,7 @@ func UnfixLogs(t *testing.T) {
 type panicLogWriter struct{}
 
 func (panicLogWriter) Write(b []byte) (int, error) {
-	// Allow certain phrases for now, in the interest of getting
-	// CI working on Windows and not having to refactor all the
-	// interfaces.GetState & tshttpproxy code to allow pushing
-	// down a Logger yet. TODO(bradfitz): do that refactoring once
-	// 1.2.0 is out.
-	if bytes.Contains(b, []byte("tshttpproxy: ")) {
-		os.Stderr.Write(b)
-		return len(b), nil
-	}
-	panic(fmt.Sprintf("please use tailscale.com/logger.Logf instead of the log package (tried to log: %q)", b))
+	panic("please use tailscale.com/logger.Logf instead of the log package")
 }
 
 // PanicOnLog modifies the standard library log package's default output to
@@ -56,47 +45,46 @@ func PanicOnLog() {
 	log.SetOutput(panicLogWriter{})
 }
 
-// NewLogLineTracker produces a LogLineTracker wrapping a given logf that tracks whether expectedFormatStrings were seen.
-func NewLogLineTracker(logf logger.Logf, expectedFormatStrings []string) *LogLineTracker {
-	ret := &LogLineTracker{
+// ListenFor produces a LogListener wrapping a given logf with the given logStrings
+func ListenFor(logf logger.Logf, logStrings []string) *LogListener {
+	ret := LogListener{
 		logf:      logf,
-		listenFor: expectedFormatStrings,
+		listenFor: logStrings,
 		seen:      make(map[string]bool),
 	}
-	for _, line := range expectedFormatStrings {
+	for _, line := range logStrings {
 		ret.seen[line] = false
 	}
-	return ret
+	return &ret
 }
 
-// LogLineTracker is a logger that tracks which log format patterns it's
-// seen and can report which expected ones were not seen later.
-type LogLineTracker struct {
+// LogListener takes a list of log lines to listen for
+type LogListener struct {
 	logf      logger.Logf
 	listenFor []string
 
 	mu   sync.Mutex
-	seen map[string]bool // format string => false (if not yet seen but wanted) or true (once seen)
+	seen map[string]bool
 }
 
-// Logf logs to its underlying logger and also tracks that the given format pattern has been seen.
-func (lt *LogLineTracker) Logf(format string, args ...interface{}) {
-	lt.mu.Lock()
-	if v, ok := lt.seen[format]; ok && !v {
-		lt.seen[format] = true
+// Logf records and logs a given line
+func (ll *LogListener) Logf(format string, args ...interface{}) {
+	ll.mu.Lock()
+	if _, ok := ll.seen[format]; ok {
+		ll.seen[format] = true
 	}
-	lt.mu.Unlock()
-	lt.logf(format, args...)
+	ll.mu.Unlock()
+	ll.logf(format, args)
 }
 
-// Check returns which format strings haven't been logged yet.
-func (lt *LogLineTracker) Check() []string {
-	lt.mu.Lock()
-	defer lt.mu.Unlock()
+// Check returns which lines haven't been logged yet
+func (ll *LogListener) Check() []string {
+	ll.mu.Lock()
+	defer ll.mu.Unlock()
 	var notSeen []string
-	for _, format := range lt.listenFor {
-		if !lt.seen[format] {
-			notSeen = append(notSeen, format)
+	for _, line := range ll.listenFor {
+		if !ll.seen[line] {
+			notSeen = append(notSeen, line)
 		}
 	}
 	return notSeen

tstest/log_test.go

@@ -4,45 +4,43 @@
 
 package tstest
 
-import (
-	"reflect"
-	"testing"
-)
+import "testing"
 
-func TestLogLineTracker(t *testing.T) {
-	const (
+func TestLogListener(t *testing.T) {
+	var (
 		l1 = "line 1: %s"
 		l2 = "line 2: %s"
 		l3 = "line 3: %s"
+
+		lineList = []string{l1, l2}
 	)
 
-	lt := NewLogLineTracker(t.Logf, []string{l1, l2})
+	ll := ListenFor(t.Logf, lineList)
 
-	if got, want := lt.Check(), []string{l1, l2}; !reflect.DeepEqual(got, want) {
-		t.Errorf("Check = %q; want %q", got, want)
+	if len(ll.Check()) != len(lineList) {
+		t.Errorf("expected %v, got %v", lineList, ll.Check())
 	}
 
-	lt.Logf(l3, "hi")
+	ll.Logf(l3, "hi")
 
-	if got, want := lt.Check(), []string{l1, l2}; !reflect.DeepEqual(got, want) {
-		t.Errorf("Check = %q; want %q", got, want)
+	if len(ll.Check()) != len(lineList) {
+		t.Errorf("expected %v, got %v", lineList, ll.Check())
 	}
 
-	lt.Logf(l1, "hi")
+	ll.Logf(l1, "hi")
 
-	if got, want := lt.Check(), []string{l2}; !reflect.DeepEqual(got, want) {
-		t.Errorf("Check = %q; want %q", got, want)
+	if len(ll.Check()) != len(lineList)-1 {
+		t.Errorf("expected %v, got %v", lineList, ll.Check())
 	}
 
-	lt.Logf(l1, "bye")
+	ll.Logf(l1, "bye")
 
-	if got, want := lt.Check(), []string{l2}; !reflect.DeepEqual(got, want) {
-		t.Errorf("Check = %q; want %q", got, want)
+	if len(ll.Check()) != len(lineList)-1 {
+		t.Errorf("expected %v, got %v", lineList, ll.Check())
 	}
 
-	lt.Logf(l2, "hi")
-
-	if got, want := lt.Check(), []string(nil); !reflect.DeepEqual(got, want) {
-		t.Errorf("Check = %q; want %q", got, want)
+	ll.Logf(l2, "hi")
+	if ll.Check() != nil {
+		t.Errorf("expected empty list, got ll.Check()")
 	}
 }

tstest/resource.go

@@ -39,13 +39,7 @@ func goroutineDump() (int, string) {
 	return p.Count(), b.String()
 }
 
-func (r *ResourceCheck) Assert(t testing.TB) {
-	if t.Failed() {
-		// Something else went wrong.
-		// Assume that that is responsible for the leak
-		// and don't pile on a bunch of extra of output.
-		return
-	}
+func (r *ResourceCheck) Assert(t *testing.T) {
 	t.Helper()
 	want := r.startNumRoutines
 
@@ -74,4 +68,5 @@ func (r *ResourceCheck) Assert(t testing.TB) {
 			}
 		}
 	}
+	t.Logf("ResourceCheck ok: goroutines before=%d after=%d\n", got, want)
 }

tsweb/jsonhandler.go

@@ -6,7 +6,6 @@ package tsweb
 
 import (
 	"encoding/json"
-	"fmt"
 	"net/http"
 )
 
@@ -16,23 +15,23 @@ type response struct {
 	Data   interface{} `json:"data,omitempty"`
 }
 
-// JSONHandlerFunc is an HTTP ReturnHandler that writes JSON responses to the client.
-//
-// Return a HTTPError to show an error message, otherwise JSONHandlerFunc will
-// only report "internal server error" to the user.
+// TODO: Header
+
+// JSONHandlerFunc only take *http.Request as argument to avoid any misuse of http.ResponseWriter.
+// The function's results must be (status int, data interface{}, err error).
+// Return a HTTPError to show an error message, otherwise JSONHandler will only show "internal server error".
 type JSONHandlerFunc func(r *http.Request) (status int, data interface{}, err error)
 
-// ServeHTTPReturn implements the ReturnHandler interface.
+// ServeHTTP calls the JSONHandlerFunc and automatically marshals http responses.
 //
 // Use the following code to unmarshal the request body
-//
 //	body := new(DataType)
 //	if err := json.NewDecoder(r.Body).Decode(body); err != nil {
 //	  return http.StatusBadRequest, nil, err
 //	}
 //
-// See jsonhandler_text.go for examples.
-func (fn JSONHandlerFunc) ServeHTTPReturn(w http.ResponseWriter, r *http.Request) error {
+// Check jsonhandler_text.go for examples
+func (fn JSONHandlerFunc) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	w.Header().Set("Content-Type", "application/json")
 	var resp *response
 	status, data, err := fn(r)
@@ -54,13 +53,6 @@ func (fn JSONHandlerFunc) ServeHTTPReturn(w http.ResponseWriter, r *http.Request
 				Error:  werr.Msg,
 				Data:   data,
 			}
-			// Unwrap the HTTPError here because we are communicating with
-			// the client in this handler. We don't want the wrapping
-			// ReturnHandler to do it too.
-			err = werr.Err
-			if werr.Msg != "" {
-				err = fmt.Errorf("%s: %w", werr.Msg, err)
-			}
 		} else {
 			resp = &response{
 				Status: "error",
@@ -69,17 +61,13 @@ func (fn JSONHandlerFunc) ServeHTTPReturn(w http.ResponseWriter, r *http.Request
 		}
 	}
 
-	b, jerr := json.Marshal(resp)
-	if jerr != nil {
+	b, err := json.Marshal(resp)
+	if err != nil {
 		w.WriteHeader(http.StatusInternalServerError)
 		w.Write([]byte(`{"status":"error","error":"json marshal error"}`))
-		if err != nil {
-			return fmt.Errorf("%w, and then we could not respond: %v", err, jerr)
-		}
-		return jerr
+		return
 	}
 
 	w.WriteHeader(status)
 	w.Write(b)
-	return err
 }

tsweb/jsonhandler_test.go

@@ -61,7 +61,7 @@ func TestNewJSONHandler(t *testing.T) {
 	t.Run("200 simple", func(t *testing.T) {
 		w := httptest.NewRecorder()
 		r := httptest.NewRequest("GET", "/", nil)
-		h21.ServeHTTPReturn(w, r)
+		h21.ServeHTTP(w, r)
 		checkStatus(w, "success", http.StatusOK)
 	})
 
@@ -72,7 +72,7 @@ func TestNewJSONHandler(t *testing.T) {
 
 		w := httptest.NewRecorder()
 		r := httptest.NewRequest("GET", "/", nil)
-		h.ServeHTTPReturn(w, r)
+		h.ServeHTTP(w, r)
 		checkStatus(w, "error", http.StatusForbidden)
 	})
 
@@ -83,7 +83,7 @@ func TestNewJSONHandler(t *testing.T) {
 	t.Run("200 get data", func(t *testing.T) {
 		w := httptest.NewRecorder()
 		r := httptest.NewRequest("GET", "/", nil)
-		h22.ServeHTTPReturn(w, r)
+		h22.ServeHTTP(w, r)
 		checkStatus(w, "success", http.StatusOK)
 	})
 
@@ -102,21 +102,21 @@ func TestNewJSONHandler(t *testing.T) {
 	t.Run("200 post data", func(t *testing.T) {
 		w := httptest.NewRecorder()
 		r := httptest.NewRequest("POST", "/", strings.NewReader(`{"Name": "tailscale"}`))
-		h31.ServeHTTPReturn(w, r)
+		h31.ServeHTTP(w, r)
 		checkStatus(w, "success", http.StatusOK)
 	})
 
 	t.Run("400 bad json", func(t *testing.T) {
 		w := httptest.NewRecorder()
 		r := httptest.NewRequest("POST", "/", strings.NewReader(`{`))
-		h31.ServeHTTPReturn(w, r)
+		h31.ServeHTTP(w, r)
 		checkStatus(w, "error", http.StatusBadRequest)
 	})
 
 	t.Run("400 post data error", func(t *testing.T) {
 		w := httptest.NewRecorder()
 		r := httptest.NewRequest("POST", "/", strings.NewReader(`{}`))
-		h31.ServeHTTPReturn(w, r)
+		h31.ServeHTTP(w, r)
 		resp := checkStatus(w, "error", http.StatusBadRequest)
 		if resp.Error != "name is empty" {
 			t.Fatalf("wrong error")
@@ -141,7 +141,7 @@ func TestNewJSONHandler(t *testing.T) {
 	t.Run("200 post data", func(t *testing.T) {
 		w := httptest.NewRecorder()
 		r := httptest.NewRequest("POST", "/", strings.NewReader(`{"Price": 10}`))
-		h32.ServeHTTPReturn(w, r)
+		h32.ServeHTTP(w, r)
 		resp := checkStatus(w, "success", http.StatusOK)
 		t.Log(resp.Data)
 		if resp.Data.Price != 20 {
@@ -152,7 +152,7 @@ func TestNewJSONHandler(t *testing.T) {
 	t.Run("400 post data error", func(t *testing.T) {
 		w := httptest.NewRecorder()
 		r := httptest.NewRequest("POST", "/", strings.NewReader(`{}`))
-		h32.ServeHTTPReturn(w, r)
+		h32.ServeHTTP(w, r)
 		resp := checkStatus(w, "error", http.StatusBadRequest)
 		if resp.Error != "price is empty" {
 			t.Fatalf("wrong error")
@@ -162,7 +162,7 @@ func TestNewJSONHandler(t *testing.T) {
 	t.Run("500 internal server error", func(t *testing.T) {
 		w := httptest.NewRecorder()
 		r := httptest.NewRequest("POST", "/", strings.NewReader(`{"Name": "root"}`))
-		h32.ServeHTTPReturn(w, r)
+		h32.ServeHTTP(w, r)
 		resp := checkStatus(w, "error", http.StatusInternalServerError)
 		if resp.Error != "internal server error" {
 			t.Fatalf("wrong error")
@@ -174,7 +174,7 @@ func TestNewJSONHandler(t *testing.T) {
 		r := httptest.NewRequest("POST", "/", nil)
 		JSONHandlerFunc(func(r *http.Request) (int, interface{}, error) {
 			return http.StatusOK, make(chan int), nil
-		}).ServeHTTPReturn(w, r)
+		}).ServeHTTP(w, r)
 		resp := checkStatus(w, "error", http.StatusInternalServerError)
 		if resp.Error != "json marshal error" {
 			t.Fatalf("wrong error")
@@ -186,7 +186,7 @@ func TestNewJSONHandler(t *testing.T) {
 		r := httptest.NewRequest("POST", "/", nil)
 		JSONHandlerFunc(func(r *http.Request) (status int, data interface{}, err error) {
 			return
-		}).ServeHTTPReturn(w, r)
+		}).ServeHTTP(w, r)
 		checkStatus(w, "error", http.StatusInternalServerError)
 	})
 }

tsweb/tsweb.go

@@ -157,22 +157,11 @@ type ReturnHandler interface {
 	ServeHTTPReturn(http.ResponseWriter, *http.Request) error
 }
 
-type HandlerOptions struct {
-	Quiet200s bool // if set, do not log successfully handled HTTP requests
-	Logf      logger.Logf
-	Now       func() time.Time // if nil, defaults to time.Now
-
-	// If non-nil, StatusCodeCounters maintains counters
-	// of status codes for handled responses.
-	// The keys are "1xx", "2xx", "3xx", "4xx", and "5xx".
-	StatusCodeCounters *expvar.Map
-}
-
 // StdHandler converts a ReturnHandler into a standard http.Handler.
 // Handled requests are logged using logf, as are any errors. Errors
 // are handled as specified by the Handler interface.
 func StdHandler(h ReturnHandler, logf logger.Logf) http.Handler {
-	return StdHandlerOpts(h, HandlerOptions{Logf: logf, Now: time.Now})
+	return stdHandler(h, logf, time.Now, true)
 }
 
 // ReturnHandlerFunc is an adapter to allow the use of ordinary
@@ -189,32 +178,27 @@ func (f ReturnHandlerFunc) ServeHTTPReturn(w http.ResponseWriter, r *http.Reques
 // StdHandlerNo200s is like StdHandler, but successfully handled HTTP
 // requests don't write an access log entry to logf.
 //
-// TODO(josharian): eliminate this and StdHandler in favor of StdHandlerOpts,
-// rename StdHandlerOpts to StdHandler. Will be a breaking API change.
+// TODO(danderson): quick stopgap, probably want ...Options on StdHandler instead?
 func StdHandlerNo200s(h ReturnHandler, logf logger.Logf) http.Handler {
-	return StdHandlerOpts(h, HandlerOptions{Logf: logf, Now: time.Now, Quiet200s: true})
+	return stdHandler(h, logf, time.Now, false)
 }
 
-// StdHandlerOpts converts a ReturnHandler into a standard http.Handler.
-// Handled requests are logged using opts.Logf, as are any errors.
-// Errors are handled as specified by the Handler interface.
-func StdHandlerOpts(h ReturnHandler, opts HandlerOptions) http.Handler {
-	if opts.Now == nil {
-		opts.Now = time.Now
-	}
-	return retHandler{h, opts}
+func stdHandler(h ReturnHandler, logf logger.Logf, now func() time.Time, log200s bool) http.Handler {
+	return retHandler{h, logf, now, log200s}
 }
 
 // retHandler is an http.Handler that wraps a Handler and handles errors.
 type retHandler struct {
-	rh   ReturnHandler
-	opts HandlerOptions
+	rh      ReturnHandler
+	logf    logger.Logf
+	timeNow func() time.Time
+	log200s bool
 }
 
 // ServeHTTP implements the http.Handler interface.
 func (h retHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	msg := AccessLogRecord{
-		When:       h.opts.Now(),
+		When:       h.timeNow(),
 		RemoteAddr: r.RemoteAddr,
 		Proto:      r.Proto,
 		TLS:        r.TLS != nil,
@@ -225,7 +209,7 @@ func (h retHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		Referer:    r.Referer(),
 	}
 
-	lw := &loggingResponseWriter{ResponseWriter: w, logf: h.opts.Logf}
+	lw := &loggingResponseWriter{ResponseWriter: w, logf: h.logf}
 	err := h.rh.ServeHTTPReturn(lw, r)
 	hErr, hErrOK := err.(HTTPError)
 
@@ -235,7 +219,7 @@ func (h retHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		lw.code = 200
 	}
 
-	msg.Seconds = h.opts.Now().Sub(msg.When).Seconds()
+	msg.Seconds = h.timeNow().Sub(msg.When).Seconds()
 	msg.Code = lw.code
 	msg.Bytes = lw.bytes
 
@@ -252,21 +236,16 @@ func (h retHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 	case hErrOK:
 		// Handler asked us to send an error. Do so, if we haven't
 		// already sent a response.
-		msg.Err = hErr.Msg
 		if hErr.Err != nil {
-			if msg.Err == "" {
-				msg.Err = hErr.Err.Error()
-			} else {
-				msg.Err = msg.Err + ": " + hErr.Err.Error()
-			}
+			msg.Err = hErr.Err.Error()
 		}
 		if lw.code != 0 {
-			h.opts.Logf("[unexpected] handler returned HTTPError %v, but already sent a response with code %d", hErr, lw.code)
+			h.logf("[unexpected] handler returned HTTPError %v, but already sent a response with code %d", hErr, lw.code)
 			break
 		}
 		msg.Code = hErr.Code
 		if msg.Code == 0 {
-			h.opts.Logf("[unexpected] HTTPError %v did not contain an HTTP status code, sending internal server error", hErr)
+			h.logf("[unexpected] HTTPError %v did not contain an HTTP status code, sending internal server error", hErr)
 			msg.Code = http.StatusInternalServerError
 		}
 		http.Error(lw, hErr.Msg, msg.Code)
@@ -280,13 +259,8 @@ func (h retHandler) ServeHTTP(w http.ResponseWriter, r *http.Request) {
 		}
 	}
 
-	if msg.Code != 200 || !h.opts.Quiet200s {
-		h.opts.Logf("%s", msg)
-	}
-
-	if h.opts.StatusCodeCounters != nil {
-		key := fmt.Sprintf("%dxx", msg.Code/100)
-		h.opts.StatusCodeCounters.Add(key, 1)
+	if msg.Code != 200 || h.log200s {
+		h.logf("%s", msg)
 	}
 }
 

tsweb/tsweb_test.go

@@ -122,7 +122,7 @@ func TestStdHandler(t *testing.T) {
 				Host:       "example.com",
 				Method:     "GET",
 				RequestURI: "/foo",
-				Err:        "not found: " + testErr.Error(),
+				Err:        testErr.Error(),
 				Code:       404,
 			},
 		},
@@ -139,7 +139,6 @@ func TestStdHandler(t *testing.T) {
 				Host:       "example.com",
 				Method:     "GET",
 				RequestURI: "/foo",
-				Err:        "not found",
 				Code:       404,
 			},
 		},
@@ -190,7 +189,7 @@ func TestStdHandler(t *testing.T) {
 				Host:       "example.com",
 				Method:     "GET",
 				RequestURI: "/foo",
-				Err:        "not found: " + testErr.Error(),
+				Err:        testErr.Error(),
 				Code:       200,
 			},
 		},
@@ -248,7 +247,7 @@ func TestStdHandler(t *testing.T) {
 			clock.Reset()
 
 			rec := noopHijacker{httptest.NewRecorder(), false}
-			h := StdHandlerOpts(test.rh, HandlerOptions{Logf: logf, Now: clock.Now})
+			h := stdHandler(test.rh, logf, clock.Now, true)
 			h.ServeHTTP(&rec, test.r)
 			res := rec.Result()
 			if res.StatusCode != test.wantCode {

types/flagtype/flagtype.go

@@ -1,46 +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.
-
-// Package flagtype defines flag.Value types.
-package flagtype
-
-import (
-	"errors"
-	"flag"
-	"fmt"
-	"math"
-	"strconv"
-	"strings"
-)
-
-type portValue struct{ n *uint16 }
-
-func PortValue(dst *uint16, defaultPort uint16) flag.Value {
-	*dst = defaultPort
-	return portValue{dst}
-}
-
-func (p portValue) String() string {
-	if p.n == nil {
-		return ""
-	}
-	return fmt.Sprint(*p.n)
-}
-func (p portValue) Set(v string) error {
-	if v == "" {
-		return errors.New("can't be the empty string")
-	}
-	if strings.Contains(v, ":") {
-		return errors.New("expecting just a port number, without a colon")
-	}
-	n, err := strconv.ParseUint(v, 10, 64) // use 64 instead of 16 to return nicer error message
-	if err != nil {
-		return fmt.Errorf("not a valid number")
-	}
-	if n > math.MaxUint16 {
-		return errors.New("out of range for port number")
-	}
-	*p.n = uint16(n)
-	return nil
-}

types/logger/logger.go

@@ -158,10 +158,7 @@ func LogOnChange(logf Logf, maxInterval time.Duration, timeNow func() time.Time)
 		tLastLogged = timeNow()
 		mu.Unlock()
 
-		// Re-stringify it (instead of using "%s", s) so something like "%s"
-		// doesn't end up getting rate-limited. (And can't use 's' as the pattern,
-		// as it might contain formatting directives.)
-		logf(format, args...)
+		logf(s)
 	}
 
 }

util/pidowner/pidowner.go

@@ -1,25 +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.
-
-// Package pidowner handles lookups from process ID to its owning user.
-package pidowner
-
-import (
-	"errors"
-	"runtime"
-)
-
-var ErrNotImplemented = errors.New("not implemented for GOOS=" + runtime.GOOS)
-
-var ErrProcessNotFound = errors.New("process not found")
-
-// OwnerOfPID returns the user ID that owns the given process ID.
-//
-// The returned user ID is suitable to passing to os/user.LookupId.
-//
-// The returned error will be ErrNotImplemented for operating systems where
-// this isn't supported.
-func OwnerOfPID(pid int) (userID string, err error) {
-	return ownerOfPID(pid)
-}

util/pidowner/pidowner_linux.go

@@ -1,37 +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.
-
-package pidowner
-
-import (
-	"fmt"
-	"os"
-	"strings"
-
-	"tailscale.com/util/lineread"
-)
-
-func ownerOfPID(pid int) (userID string, err error) {
-	file := fmt.Sprintf("/proc/%d/status", pid)
-	err = lineread.File(file, func(line []byte) error {
-		if len(line) < 4 || string(line[:4]) != "Uid:" {
-			return nil
-		}
-		f := strings.Fields(string(line))
-		if len(f) >= 2 {
-			userID = f[1] // real userid
-		}
-		return nil
-	})
-	if os.IsNotExist(err) {
-		return "", ErrProcessNotFound
-	}
-	if err != nil {
-		return
-	}
-	if userID == "" {
-		return "", fmt.Errorf("missing Uid line in %s", file)
-	}
-	return userID, nil
-}

util/pidowner/pidowner_noimpl.go

@@ -1,9 +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.
-
-// +build !windows,!linux
-
-package pidowner
-
-func ownerOfPID(pid int) (userID string, err error) { return "", ErrNotImplemented }

util/pidowner/pidowner_test.go

@@ -1,51 +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.
-
-package pidowner
-
-import (
-	"math/rand"
-	"os"
-	"os/user"
-	"testing"
-)
-
-func TestOwnerOfPID(t *testing.T) {
-	id, err := OwnerOfPID(os.Getpid())
-	if err == ErrNotImplemented {
-		t.Skip(err)
-	}
-	if err != nil {
-		t.Fatal(err)
-	}
-	t.Logf("id=%q", id)
-
-	u, err := user.LookupId(id)
-	if err != nil {
-		t.Fatalf("LookupId: %v", err)
-	}
-	t.Logf("Got: %+v", u)
-}
-
-// validate that OS implementation returns ErrProcessNotFound.
-func TestNotFoundError(t *testing.T) {
-	// Try a bunch of times to stumble upon a pid that doesn't exist...
-	const tries = 50
-	for i := 0; i < tries; i++ {
-		_, err := OwnerOfPID(rand.Intn(1e9))
-		if err == ErrNotImplemented {
-			t.Skip(err)
-		}
-		if err == nil {
-			// We got unlucky and this pid existed. Try again.
-			continue
-		}
-		if err == ErrProcessNotFound {
-			// Pass.
-			return
-		}
-		t.Fatalf("Error is not ErrProcessNotFound: %T %v", err, err)
-	}
-	t.Errorf("after %d tries, couldn't find a process that didn't exist", tries)
-}

util/pidowner/pidowner_windows.go

@@ -1,36 +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.
-
-package pidowner
-
-import (
-	"fmt"
-	"syscall"
-
-	"golang.org/x/sys/windows"
-)
-
-func ownerOfPID(pid int) (userID string, err error) {
-	procHnd, err := windows.OpenProcess(windows.PROCESS_QUERY_INFORMATION, false, uint32(pid))
-	if err == syscall.Errno(0x57) { // invalid parameter, for PIDs that don't exist
-		return "", ErrProcessNotFound
-	}
-	if err != nil {
-		return "", fmt.Errorf("OpenProcess: %T %#v", err, err)
-	}
-	defer windows.CloseHandle(procHnd)
-
-	var tok windows.Token
-	if err := windows.OpenProcessToken(procHnd, windows.TOKEN_QUERY, &tok); err != nil {
-		return "", fmt.Errorf("OpenProcessToken: %w", err)
-	}
-
-	tokUser, err := tok.GetTokenUser()
-	if err != nil {
-		return "", fmt.Errorf("GetTokenUser: %w", err)
-	}
-
-	sid := tokUser.User.Sid
-	return sid.String(), nil
-}

util/uniq/slice.go

@@ -1,65 +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.
-
-// Package uniq provides removal of adjacent duplicate elements in slices.
-// It is similar to the unix command uniq.
-package uniq
-
-import (
-	"fmt"
-	"reflect"
-)
-
-type badTypeError struct {
-	typ reflect.Type
-}
-
-func (e badTypeError) Error() string {
-	return fmt.Sprintf("uniq.ModifySlice's first argument must have type *[]T, got %v", e.typ)
-}
-
-// ModifySlice removes adjacent duplicate elements from the slice pointed to by sliceptr.
-// It adjusts the length of the slice appropriately and zeros the tail.
-// eq reports whether (*sliceptr)[i] and (*sliceptr)[j] are equal.
-// ModifySlice does O(len(*sliceptr)) operations.
-func ModifySlice(sliceptr interface{}, eq func(i, j int) bool) {
-	rvp := reflect.ValueOf(sliceptr)
-	if rvp.Type().Kind() != reflect.Ptr {
-		panic(badTypeError{rvp.Type()})
-	}
-	rv := rvp.Elem()
-	if rv.Type().Kind() != reflect.Slice {
-		panic(badTypeError{rvp.Type()})
-	}
-
-	length := rv.Len()
-	dst := 0
-	for i := 1; i < length; i++ {
-		if eq(dst, i) {
-			continue
-		}
-		dst++
-		// slice[dst] = slice[i]
-		rv.Index(dst).Set(rv.Index(i))
-	}
-
-	end := dst + 1
-	var zero reflect.Value
-	if end < length {
-		zero = reflect.Zero(rv.Type().Elem())
-	}
-
-	// for i := range slice[end:] {
-	//   size[i] = 0/nil/{}
-	// }
-	for i := end; i < length; i++ {
-		// slice[i] = 0/nil/{}
-		rv.Index(i).Set(zero)
-	}
-
-	// slice = slice[:end]
-	if end < length {
-		rv.SetLen(end)
-	}
-}

util/uniq/slice_test.go

@@ -1,88 +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.
-
-package uniq_test
-
-import (
-	"reflect"
-	"strconv"
-	"testing"
-
-	"tailscale.com/util/uniq"
-)
-
-func TestModifySlice(t *testing.T) {
-	tests := []struct {
-		in   []int
-		want []int
-	}{
-		{in: []int{0, 1, 2}, want: []int{0, 1, 2}},
-		{in: []int{0, 1, 2, 2}, want: []int{0, 1, 2}},
-		{in: []int{0, 0, 1, 2}, want: []int{0, 1, 2}},
-		{in: []int{0, 1, 0, 2}, want: []int{0, 1, 0, 2}},
-		{in: []int{0}, want: []int{0}},
-		{in: []int{0, 0}, want: []int{0}},
-		{in: []int{}, want: []int{}},
-	}
-
-	for _, test := range tests {
-		in := make([]int, len(test.in))
-		copy(in, test.in)
-		uniq.ModifySlice(&test.in, func(i, j int) bool { return test.in[i] == test.in[j] })
-		if !reflect.DeepEqual(test.in, test.want) {
-			t.Errorf("uniq.Slice(%v) = %v, want %v", in, test.in, test.want)
-		}
-		start := len(test.in)
-		test.in = test.in[:cap(test.in)]
-		for i := start; i < len(in); i++ {
-			if test.in[i] != 0 {
-				t.Errorf("uniq.Slice(%v): non-0 in tail of %v at index %v", in, test.in, i)
-			}
-		}
-	}
-}
-
-func Benchmark(b *testing.B) {
-	benches := []struct {
-		name  string
-		reset func(s []byte)
-	}{
-		{name: "AllDups",
-			reset: func(s []byte) {
-				for i := range s {
-					s[i] = '*'
-				}
-			},
-		},
-		{name: "NoDups",
-			reset: func(s []byte) {
-				for i := range s {
-					s[i] = byte(i)
-				}
-			},
-		},
-	}
-
-	for _, bb := range benches {
-		b.Run(bb.name, func(b *testing.B) {
-			for size := 1; size <= 4096; size *= 16 {
-				b.Run(strconv.Itoa(size), func(b *testing.B) {
-					benchmark(b, 64, bb.reset)
-				})
-			}
-		})
-	}
-}
-
-func benchmark(b *testing.B, size int64, reset func(s []byte)) {
-	b.ReportAllocs()
-	b.SetBytes(size)
-	s := make([]byte, size)
-	b.ResetTimer()
-	for i := 0; i < b.N; i++ {
-		s = s[:size]
-		reset(s)
-		uniq.ModifySlice(&s, func(i, j int) bool { return s[i] == s[j] })
-	}
-}

version/.gitignore

@@ -1,9 +1,6 @@
 describe.txt
 long.txt
 short.txt
-gitcommit.txt
-extragitcommit.txt
-version-info.sh
 version.h
 version.xcconfig
 ver.go

version/describe.txt.do

@@ -0,0 +1,4 @@
+describe=$(cd ../.. && git describe --long --abbrev=9)
+echo "$describe" >$3
+redo-always
+redo-stamp <$3

version/distro/distro.go

@@ -1,44 +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.
-
-// Package distro reports which distro we're running on.
-package distro
-
-import (
-	"os"
-	"runtime"
-)
-
-type Distro string
-
-const (
-	Debian   = Distro("debian")
-	Arch     = Distro("arch")
-	Synology = Distro("synology")
-	OpenWrt  = Distro("openwrt")
-)
-
-// Get returns the current distro, or the empty string if unknown.
-func Get() Distro {
-	if runtime.GOOS == "linux" {
-		return linuxDistro()
-	}
-	return ""
-}
-
-func linuxDistro() Distro {
-	if fi, err := os.Stat("/usr/syno"); err == nil && fi.IsDir() {
-		return Synology
-	}
-	if _, err := os.Stat("/etc/debian_version"); err == nil {
-		return Debian
-	}
-	if _, err := os.Stat("/etc/arch-release"); err == nil {
-		return Arch
-	}
-	if _, err := os.Stat("/etc/openwrt_version"); err == nil {
-		return OpenWrt
-	}
-	return ""
-}

version/long.txt.do

@@ -0,0 +1,4 @@
+redo-ifchange mkversion.sh describe.txt
+read -r describe <describe.txt
+ver=$(./mkversion.sh long "$describe")
+echo "$ver" >$3

version/mkversion.sh

@@ -0,0 +1,111 @@
+#!/bin/sh
+
+set -eu
+
+mode=$1
+describe=$2
+
+# Git describe output overall looks like
+# MAJOR.MINOR.PATCH-NUMCOMMITS-GITHASH. Depending on the tag being
+# described and the state of the repo, ver can be missing PATCH,
+# NUMCOMMITS, or both.
+#
+# Valid values look like: 1.2.3-1234-abcdef, 0.98-1234-abcdef,
+# 1.0.0-abcdef, 0.99-abcdef.
+ver="${describe#v}"
+stem="${ver%%-*}" # Just the semver-ish bit e.g. 1.2.3, 0.98
+suffix="${ver#$stem}" # The rest e.g. -23-abcdef, -abcdef
+
+# Normalize the stem into a full major.minor.patch semver. We might
+# not use all those pieces depending on what kind of version we're
+# making, but it's good to have them all on hand.
+case "$stem" in
+    *.*.*)
+        # Full SemVer, nothing to do
+        stem="$stem"
+        ;;
+    *.*)
+        # Old style major.minor, add a .0
+        stem="${stem}.0"
+        ;;
+    *)
+        echo "Unparseable version $stem" >&2
+        exit 1
+        ;;
+esac
+major=$(echo "$stem" | cut -f1 -d.)
+minor=$(echo "$stem" | cut -f2 -d.)
+patch=$(echo "$stem" | cut -f3 -d.)
+
+# Extract the change count and git ID from the suffix.
+case "$suffix" in
+    -*-*)
+        # Has both a change count and a commit hash.
+        changecount=$(echo "$suffix" | cut -f2 -d-)
+        githash=$(echo "$suffix" | cut -f3 -d-)
+        ;;
+    -*)
+        # Git hash only, change count is zero.
+        changecount="0"
+        githash=$(echo "$suffix" | cut -f2 -d-)
+        ;;
+    *)
+        echo "Unparseable version suffix $suffix" >&2
+        exit 1
+        ;;
+esac
+
+# Validate that the version data makes sense. Rules:
+#  - Odd number minors are unstable. Patch must be 0, and gets
+#    replaced by changecount.
+#  - Even number minors are stable. Changecount must be 0, and
+#    gets removed.
+#
+# After this section, we only use major/minor/patch, which have been
+# tweaked as needed.
+if expr "$minor" : "[0-9]*[13579]$" >/dev/null; then
+    # Unstable
+    if [ "$patch" != "0" ]; then
+        # This is a fatal error, because a non-zero patch number
+        # indicates that we created an unstable git tag in violation
+        # of our versioning policy, and we want to blow up loudly to
+        # get that fixed.
+        echo "Unstable release $describe has a non-zero patch number, which is not allowed" >&2
+        exit 1
+    fi
+    patch="$changecount"
+else
+    # Stable
+    if [ "$changecount" != "0" ]; then
+        # This is a commit that's sitting between two stable
+        # releases. We never want to release such a commit to the
+        # pbulic, but it's useful to be able to build it for
+        # debugging. Just force the version to 0.0.0, so that we're
+        # forced to rely on the git commit hash.
+        major=0
+        minor=0
+        patch=0
+    fi
+fi
+
+case "$1" in
+    long)
+        echo "${major}.${minor}.${patch}-${githash}"
+        ;;
+    short)
+        echo "${major}.${minor}.${patch}"
+        ;;
+    xcode)
+        # CFBundleShortVersionString: the "short name" used in the App
+        # Store.  eg. 0.92.98
+        echo "VERSION_NAME = ${major}.${minor}.${patch}"
+        # CFBundleVersion: the build number. Needs to be 3 numeric
+        # sections that increment for each release according to SemVer
+        # rules.
+        #
+        # We start counting at 100 because we submitted using raw
+        # build numbers before, and Apple doesn't let you start over.
+        # e.g. 0.98.3 -> 100.98.3
+        echo "VERSION_ID = $((major + 100)).${minor}.${patch}"        
+        ;;
+esac

version/mkversion_test.go

@@ -7,96 +7,69 @@ package version
 import (
 	"fmt"
 	"os/exec"
-	"runtime"
-	"strconv"
 	"strings"
 	"testing"
-
-	"github.com/google/go-cmp/cmp"
 )
 
-func mkversion(t *testing.T, gitHash, otherHash string, major, minor, patch, changeCount int) (string, bool) {
+func xcode(short, long string) string {
+	return fmt.Sprintf("VERSION_NAME = %s\nVERSION_ID = %s", short, long)
+}
+
+func mkversion(t *testing.T, mode, in string) (string, bool) {
 	t.Helper()
-	bs, err := exec.Command("./version.sh", gitHash, otherHash, strconv.Itoa(major), strconv.Itoa(minor), strconv.Itoa(patch), strconv.Itoa(changeCount)).CombinedOutput()
-	out := strings.TrimSpace(string(bs))
+	bs, err := exec.Command("./mkversion.sh", mode, in).CombinedOutput()
 	if err != nil {
-		return out, false
+		t.Logf("mkversion.sh output: %s", string(bs))
+		return "", false
 	}
-	return out, true
+	return strings.TrimSpace(string(bs)), true
 }
 
 func TestMkversion(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		t.Skip("skip test on Windows, because there is no shell to execute mkversion.sh.")
-	}
 	tests := []struct {
-		gitHash, otherHash               string
-		major, minor, patch, changeCount int
-		want                             string
+		in    string
+		ok    bool
+		long  string
+		short string
+		xcode string
 	}{
-		{"abcdef", "", 0, 98, 0, 0, `
-           VERSION_SHORT="0.98.0"
-           VERSION_LONG="0.98.0-tabcdef"
-           VERSION_GIT_HASH="abcdef"
-           VERSION_EXTRA_HASH=""
-           VERSION_XCODE="100.98.0"
-           VERSION_WINRES="0,98,0,0"`},
-		{"abcdef", "", 0, 98, 1, 0, `
-           VERSION_SHORT="0.98.1"
-           VERSION_LONG="0.98.1-tabcdef"
-           VERSION_GIT_HASH="abcdef"
-           VERSION_EXTRA_HASH=""
-           VERSION_XCODE="100.98.1"
-           VERSION_WINRES="0,98,1,0"`},
-		{"abcdef", "", 1, 1, 0, 37, `
-           VERSION_SHORT="1.1.1037"
-           VERSION_LONG="1.1.1037-tabcdef"
-           VERSION_GIT_HASH="abcdef"
-           VERSION_EXTRA_HASH=""
-           VERSION_XCODE="101.1.1037"
-           VERSION_WINRES="1,1,1037,0"`},
-		{"abcdef", "", 1, 2, 9, 0, `
-           VERSION_SHORT="1.2.9"
-           VERSION_LONG="1.2.9-tabcdef"
-           VERSION_GIT_HASH="abcdef"
-           VERSION_EXTRA_HASH=""
-           VERSION_XCODE="101.2.9"
-           VERSION_WINRES="1,2,9,0"`},
-		{"abcdef", "", 1, 15, 0, 129, `
-           VERSION_SHORT="1.15.129"
-           VERSION_LONG="1.15.129-tabcdef"
-           VERSION_GIT_HASH="abcdef"
-           VERSION_EXTRA_HASH=""
-           VERSION_XCODE="101.15.129"
-           VERSION_WINRES="1,15,129,0"`},
-		{"abcdef", "", 1, 2, 0, 17, `
-           VERSION_SHORT="0.0.0"
-           VERSION_LONG="0.0.0-tabcdef"
-           VERSION_GIT_HASH="abcdef"
-           VERSION_EXTRA_HASH=""
-           VERSION_XCODE="100.0.0"
-           VERSION_WINRES="0,0,0,0"`},
-		{"abcdef", "defghi", 1, 15, 0, 129, `
-           VERSION_SHORT="1.15.129"
-           VERSION_LONG="1.15.129-tabcdef-gdefghi"
-           VERSION_GIT_HASH="abcdef"
-           VERSION_EXTRA_HASH="defghi"
-           VERSION_XCODE="101.15.129"
-           VERSION_WINRES="1,15,129,0"`},
-		{"abcdef", "", 0, 99, 5, 0, ""},   // unstable, patch number not allowed
-		{"abcdef", "", 0, 99, 5, 123, ""}, // unstable, patch number not allowed
+		{"v0.98-abcdef", true, "0.98.0-abcdef", "0.98.0", xcode("0.98.0", "100.98.0")},
+		{"v0.98.1-abcdef", true, "0.98.1-abcdef", "0.98.1", xcode("0.98.1", "100.98.1")},
+		{"v1.1.0-37-abcdef", true, "1.1.37-abcdef", "1.1.37", xcode("1.1.37", "101.1.37")},
+		{"v1.2.9-abcdef", true, "1.2.9-abcdef", "1.2.9", xcode("1.2.9", "101.2.9")},
+		{"v1.2.9-0-abcdef", true, "1.2.9-abcdef", "1.2.9", xcode("1.2.9", "101.2.9")},
+		{"v1.15.0-129-abcdef", true, "1.15.129-abcdef", "1.15.129", xcode("1.15.129", "101.15.129")},
+
+		{"v0.98-123-abcdef", true, "0.0.0-abcdef", "0.0.0", xcode("0.0.0", "100.0.0")},
+		{"v1.0.0-37-abcdef", true, "0.0.0-abcdef", "0.0.0", xcode("0.0.0", "100.0.0")},
+
+		{"v0.99.5-0-abcdef", false, "", "", ""},   // unstable, patch not allowed
+		{"v0.99.5-123-abcdef", false, "", "", ""}, // unstable, patch not allowed
+		{"v1-abcdef", false, "", "", ""},          // bad semver
+		{"v1.0", false, "", "", ""},               // missing suffix
 	}
 
 	for _, test := range tests {
-		want := strings.ReplaceAll(strings.TrimSpace(test.want), " ", "")
-		got, ok := mkversion(t, test.gitHash, test.otherHash, test.major, test.minor, test.patch, test.changeCount)
-		invoc := fmt.Sprintf("version.sh %s %s %d %d %d %d", test.gitHash, test.otherHash, test.major, test.minor, test.patch, test.changeCount)
-		if want == "" && ok {
-			t.Errorf("%s ok=true, want false", invoc)
-			continue
+		gotlong, longOK := mkversion(t, "long", test.in)
+		if longOK != test.ok {
+			t.Errorf("mkversion.sh long %q ok=%v, want %v", test.in, longOK, test.ok)
 		}
-		if diff := cmp.Diff(got, want); want != "" && diff != "" {
-			t.Errorf("%s wrong output (-got+want):\n%s", invoc, diff)
+		gotshort, shortOK := mkversion(t, "short", test.in)
+		if shortOK != test.ok {
+			t.Errorf("mkversion.sh short %q ok=%v, want %v", test.in, shortOK, test.ok)
+		}
+		gotxcode, xcodeOK := mkversion(t, "xcode", test.in)
+		if xcodeOK != test.ok {
+			t.Errorf("mkversion.sh xcode %q ok=%v, want %v", test.in, xcodeOK, test.ok)
+		}
+		if longOK && gotlong != test.long {
+			t.Errorf("mkversion.sh long %q: got %q, want %q", test.in, gotlong, test.long)
+		}
+		if shortOK && gotshort != test.short {
+			t.Errorf("mkversion.sh short %q: got %q, want %q", test.in, gotshort, test.short)
+		}
+		if xcodeOK && gotxcode != test.xcode {
+			t.Errorf("mkversion.sh xcode %q: got %q, want %q", test.in, gotxcode, test.xcode)
 		}
 	}
 }

version/print.go

@@ -1,25 +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.
-
-package version
-
-import (
-	"fmt"
-	"runtime"
-	"strings"
-)
-
-func String() string {
-	var ret strings.Builder
-	ret.WriteString(Short)
-	ret.WriteByte('\n')
-	if GitCommit != "" {
-		fmt.Fprintf(&ret, "  tailscale commit: %s\n", GitCommit)
-	}
-	if ExtraGitCommit != "" {
-		fmt.Fprintf(&ret, "  other commit: %s\n", ExtraGitCommit)
-	}
-	fmt.Fprintf(&ret, "  go version: %s\n", runtime.Version())
-	return strings.TrimSpace(ret.String())
-}

version/short.txt.do

@@ -0,0 +1,4 @@
+redo-ifchange mkversion.sh describe.txt
+read -r describe <describe.txt
+ver=$(./mkversion.sh short "$describe")
+echo "$ver" >$3

version/ver.go.do

@@ -1,9 +1,8 @@
-redo-ifchange version-info.sh ver.go.in
+redo-ifchange long.txt short.txt ver.go.in
 
-. ./version-info.sh
+read -r LONGVER <long.txt
+read -r SHORTVER <short.txt
 
-sed -e "s/{LONGVER}/$VERSION_LONG/g" \
-    -e "s/{SHORTVER}/$VERSION_SHORT/g" \
-    -e "s/{GITCOMMIT}/$VERSION_GIT_HASH/g" \
-    -e "s/{EXTRAGITCOMMIT}/$VERSION_EXTRA_HASH/g" \
+sed -e "s/{LONGVER}/$LONGVER/g" \
+    -e "s/{SHORTVER}/$SHORTVER/g" \
     <ver.go.in >$3

version/ver.go.in

@@ -6,9 +6,5 @@
 
 package version
 
-const Long = "{LONGVER}"
-const Short = "{SHORTVER}"
-const LONG = Long
-const SHORT = Short
-const GitCommit = "{GITCOMMIT}"
-const ExtraGitCommit = "{EXTRAGITCOMMIT}"
+const LONG = "{LONGVER}"
+const SHORT = "{SHORTVER}"

version/version-info.sh.do

@@ -1,3 +0,0 @@
-./version.sh ../.. >$3
-redo-always
-redo-stamp <$3

version/version.go

@@ -7,35 +7,5 @@
 // Package version provides the version that the binary was built at.
 package version
 
-// Long is a full version number for this build, of the form
-// "x.y.z-commithash", or "date.yyyymmdd" if no actual version was
-// provided.
-const Long = "date.20200921"
-
-// Short is a short version number for this build, of the form
-// "x.y.z", or "date.yyyymmdd" if no actual version was provided.
-const Short = Long
-
-// LONG is a deprecated alias for Long. Don't use it.
-const LONG = Long
-
-// SHORT is a deprecated alias for Short. Don't use it.
-const SHORT = Short
-
-// GitCommit, if non-empty, is the git commit of the
-// github.com/tailscale/tailscale repository at which Tailscale was
-// built. Its format is the one returned by `git describe --always
-// --exclude "*" --dirty --abbrev=200`.
-const GitCommit = ""
-
-// ExtraGitCommit, if non-empty, is the git commit of a "supplemental"
-// repository at which Tailscale was built. Its format is the same as
-// gitCommit.
-//
-// ExtraGitCommit is used to track the source revision when the main
-// Tailscale repository is integrated into and built from another
-// repository (for example, Tailscale's proprietary code, or the
-// Android OSS repository). Together, GitCommit and ExtraGitCommit
-// exactly describe what repositories and commits were used in a
-// build.
-const ExtraGitCommit = ""
+const LONG = "date.20200820"
+const SHORT = LONG

version/version.h.do

@@ -1,9 +1,11 @@
-redo-ifchange version-info.sh
+redo-ifchange long.txt short.txt
+read -r long <long.txt
+read -r short <short.txt
 
-. ./version-info.sh
+# get it into "major.minor.patch" format
+ver=$(echo "$ver" | sed -e 's/-/./')
 
-cat >$3 <<EOF
-#define TAILSCALE_VERSION_LONG "$VERSION_LONG"
-#define TAILSCALE_VERSION_SHORT "$VERSION_SHORT"
-#define TAILSCALE_VERSION_WIN_RES $VERSION_WINRES
-EOF
+(
+	printf '#define TAILSCALE_VERSION_LONG "%s"\n' "$long"
+	printf '#define TAILSCALE_VERSION_SHORT "%s"\n' "$short"
+) >$3

version/version.sh

@@ -1,109 +0,0 @@
-#!/bin/sh
-
-set -eu
-
-case $# in
-    0|1)
-        # extra_hash describes a git repository other than the current
-        # one. It gets embedded as an additional commit hash in built
-        # binaries, to help us locate the exact set of tools and code
-        # that were used.
-        extra_hash="${1:-}"
-        if [ -z "$extra_hash" ]; then
-            # Nothing, empty extra hash is fine.
-            extra_hash=""
-        elif [ -d "$extra_hash/.git" ]; then
-            extra_hash=$(cd "$extra_hash" && git describe --always --dirty --exclude '*' --abbrev=200)
-        elif ! expr "$extra_hash" : "^[0-9a-f]*$"; then
-            echo "Invalid extra hash '$extra_hash', must be a git commit hash or path to a git repo" >&2
-            exit 1
-        fi
-
-        # Load the base version and optional corresponding git hash
-        # from the VERSION file. If there is no git hash in the file,
-        # we use the hash of the last change to the VERSION file.
-        version_file="$(dirname $0)/../VERSION.txt"
-        IFS=".$IFS" read -r major minor patch base_git_hash <"$version_file"
-        if [ -z "$base_git_hash" ]; then
-            base_git_hash=$(git rev-list --max-count=1 HEAD -- $version_file)
-        fi
-
-        # The full git has we're currently building at. --abbrev=200 is an
-        # arbitrary large number larger than all currently-known hashes, so
-        # that git displays the full commit hash.
-        git_hash=$(git describe --always --dirty --exclude '*' --abbrev=200)
-        # The number of extra commits between the release base to git_hash.
-        change_count=$(git rev-list ${base_git_hash}..HEAD | wc -l)
-        ;;
-    6)
-        # Test mode: rather than run git commands and whatnot, take in
-        # all the version pieces as arguments.
-        git_hash=$1
-        extra_hash=$2
-        major=$3
-        minor=$4
-        patch=$5
-        change_count=$6
-        ;;
-    *)
-        echo "Usage: $0 [extra-git-hash-or-checkout]"
-        exit 1
-esac
-
-# Shortened versions of git hashes, so that they fit neatly into an
-# "elongated" but still human-readable version number.
-short_git_hash=$(echo $git_hash | cut -c-9)
-short_extra_hash=$(echo $extra_hash | cut -c-9)
-
-# Convert major/minor/patch/change_count into an adjusted
-# major/minor/patch. This block is where all our policies on
-# versioning are.
-if expr "$minor" : "[0-9]*[13579]$" >/dev/null; then
-    # Odd minor numbers are unstable builds.
-    if [ "$patch" != "0" ]; then
-        # This is a fatal error, because a non-zero patch number
-        # indicates that we created an unstable git tag in violation
-        # of our versioning policy, and we want to blow up loudly to
-        # get that fixed.
-        echo "Unstable release $major.$minor.$patch has a non-zero patch number, which is not allowed" >&2
-        exit 1
-    fi
-    patch="$change_count"
-elif [ "$change_count" != "0" ]; then
-    # Even minor numbers are stable builds, but stable builds are
-    # supposed to have a zero change count. Therefore, we're currently
-    # describing a commit that's on a release branch, but hasn't been
-    # tagged as a patch release yet. We allow these commits to build
-    # for testing purposes, but force their version number to 0.0.0,
-    # to reflect that they're an unreleasable build. The git hashes
-    # still completely describe the build commit, so we can still
-    # figure out what this build is if it escapes into the wild.
-    major="0"
-    minor="0"
-    patch="0"
-fi
-
-# Hack for 1.1: add 1000 to the patch number. We switched from using
-# the proprietary repo's change_count over to using the OSS repo's
-# change_count, and this was necessary to avoid a backwards jump in
-# release numbers.
-if [ "$major.$minor" = "1.1" ]; then
-    patch="$((patch + 1000))"
-fi
-
-# At this point, the version number correctly reflects our
-# policies. All that remains is to output the various vars that other
-# code can use to embed version data.
-if [ -z "$extra_hash" ]; then
-    long_version_suffix="-t$short_git_hash"
-else
-    long_version_suffix="-t${short_git_hash}-g${short_extra_hash}"
-fi
-cat <<EOF
-VERSION_SHORT="${major}.${minor}.${patch}"
-VERSION_LONG="${major}.${minor}.${patch}${long_version_suffix}"
-VERSION_GIT_HASH="${git_hash}"
-VERSION_EXTRA_HASH="${extra_hash}"
-VERSION_XCODE="$((major + 100)).${minor}.${patch}"
-VERSION_WINRES="${major},${minor},${patch},0"
-EOF

version/version.xcconfig.do

@@ -1,14 +1,4 @@
-redo-ifchange version-info.sh
-
-. ./version-info.sh
-
-# CFBundleShortVersionString: the "short name" used in the App Store.
-# eg. 0.92.98
-echo "VERSION_NAME = $VERSION_SHORT"
-# CFBundleVersion: the build number. Needs to be 3 numeric sections
-# that increment for each release according to SemVer rules.
-#
-# We start counting at 100 because we submitted using raw build
-# numbers before, and Apple doesn't let you start over.  e.g. 0.98.3
-# -> 100.98.3
-echo "VERSION_ID = $VERSION_XCODE"
+redo-ifchange mkversion.sh describe.txt
+read -r describe <describe.txt
+ver=$(./mkversion.sh xcode "$describe")
+echo "$ver" >$3

version/xversion.go

@@ -6,12 +6,6 @@
 
 package version
 
-// Replaced at build time with the Go linker flag -X. See
-// ../build_dist.sh for example usage, and version.go for field
-// documentation.
-var Long string = "<not set>"
-var Short string = "<not set>"
-var LONG = Long
-var SHORT = Short
-var GitCommit = ""
-var ExtraGitCommit = ""
+// Replaced at build time with the Go linker flag -X.
+var LONG string = "<not set>"
+var SHORT string = "<not set>"

wgengine/filter/filter.go

@@ -367,15 +367,6 @@ func (f *Filter) pre(q *packet.ParsedPacket, rf RunFlags, dir direction) Respons
 		f.logRateLimit(rf, q, dir, Drop, "ipv6")
 		return Drop
 	}
-	if q.DstIP.IsMulticast() {
-		f.logRateLimit(rf, q, dir, Drop, "multicast")
-		return Drop
-	}
-	if q.DstIP.IsLinkLocalUnicast() {
-		f.logRateLimit(rf, q, dir, Drop, "link-local-unicast")
-		return Drop
-	}
-
 	switch q.IPProto {
 	case packet.Unknown:
 		// Unknown packets are dangerous; always drop them.
@@ -418,9 +409,6 @@ func omitDropLogging(p *packet.ParsedPacket, dir direction) bool {
 			if ipProto == packet.IGMP {
 				return true
 			}
-			if p.DstIP.IsMulticast() || p.DstIP.IsLinkLocalUnicast() {
-				return true
-			}
 		case 6:
 			if len(b) < 40 {
 				return false