ipn: use LogServer pref

Signed-off-by: Christine Dodrill <xe@tailscale.com>

ipn/local.go

@@ -429,6 +429,10 @@ func (b *LocalBackend) Start(opts Options) error {
 		return fmt.Errorf("loading requested state: %v", err)
 	}
 
+	if b.prefs.LogServer == "" {
+		b.prefs.LogServer = "https://log.tailscale.io"
+	}
+	os.Setenv("TAILSCALE_LOG_TARGET", b.prefs.LogServer)
 	b.inServerMode = b.prefs.ForceDaemon
 	b.serverURL = b.prefs.ControlURL
 	hostinfo.RoutableIPs = append(hostinfo.RoutableIPs, b.prefs.AdvertiseRoutes...)

ipn/prefs.go

@@ -124,6 +124,10 @@ type Prefs struct {
 	//  We can maybe do that once we're sure which module should persist
 	//  it (backend or frontend?)
 	Persist *controlclient.Persist `json:"Config"`
+
+	// The target server where logs should be sent. If not set this will
+	// default to https://log.tailscale.io.
+	LogServer string
 }
 
 // IsEmpty reports whether p is nil or pointing to a Prefs zero value.

ipn/prefs_clone.go

@@ -48,4 +48,5 @@ var _PrefsNeedsRegeneration = Prefs(struct {
 	NoSNAT           bool
 	NetfilterMode    router.NetfilterMode
 	Persist          *controlclient.Persist
+	LogServer        string
 }{})

logpolicy/logpolicy.go

@@ -17,6 +17,7 @@ import (
 	"log"
 	"net"
 	"net/http"
+	"net/url"
 	"os"
 	"os/exec"
 	"path/filepath"
@@ -387,6 +388,13 @@ func New(collection string) *Policy {
 		HTTPC: &http.Client{Transport: newLogtailTransport(logtail.DefaultHost)},
 	}
 
+	if val, ok := os.LookupEnv("TAILSCALE_LOG_TARGET"); ok {
+		log.Println("You have enabled a non-default log target. Doing without being told to by Tailscale staff or your network administrator will make getting support difficult.")
+		c.BaseURL = val
+		u, _ := url.Parse(val)
+		c.HTTPC = &http.Client{Transport: newLogtailTransport(u.Host)}
+	}
+
 	filchBuf, filchErr := filch.New(filepath.Join(dir, cmdName), filch.Options{})
 	if filchBuf != nil {
 		c.Buffer = filchBuf