net/netmon: publish events to event bus

Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>

cmd/tailscaled/debug.go

@@ -27,6 +27,7 @@ import (
 	"tailscale.com/net/tshttpproxy"
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/key"
+	"tailscale.com/util/eventbus"
 )
 
 var debugArgs struct {
@@ -72,11 +73,14 @@ func debugMode(args []string) error {
 }
 
 func runMonitor(ctx context.Context, loop bool) error {
+	b := eventbus.New()
+	defer b.Close()
+
 	dump := func(st *netmon.State) {
 		j, _ := json.MarshalIndent(st, "", "    ")
 		os.Stderr.Write(j)
 	}
-	mon, err := netmon.New(log.Printf)
+	mon, err := netmon.New(b, log.Printf)
 	if err != nil {
 		return err
 	}

cmd/tailscaled/tailscaled.go

@@ -391,7 +391,7 @@ func run() (err error) {
 	var netMon *netmon.Monitor
 	isWinSvc := isWindowsService()
 	if !isWinSvc {
-		netMon, err = netmon.New(logf)
+		netMon, err = netmon.New(sys.Bus.Get(), logf)
 		if err != nil {
 			return fmt.Errorf("netmon.New: %w", err)
 		}

cmd/tailscaled/tailscaled_windows.go

@@ -329,7 +329,7 @@ func beWindowsSubprocess() bool {
 	}
 
 	sys := tsd.NewSystem()
-	netMon, err := netmon.New(log.Printf)
+	netMon, err := netmon.New(sys.Bus.Get(), log.Printf)
 	if err != nil {
 		log.Fatalf("Could not create netMon: %v", err)
 	}