cmd/tailscale: add derp and endpoints status (#703)

cmd/tailscale: add local node's information to status output (by default)

RELNOTE=yes

Updates #477

Signed-off-by: Halulu <lzjluzijie@gmail.com>

cmd/tailscale/cli/status.go

@@ -33,6 +33,7 @@ var statusCmd = &ffcli.Command{
 		fs.BoolVar(&statusArgs.json, "json", false, "output in JSON format (WARNING: format subject to change)")
 		fs.BoolVar(&statusArgs.web, "web", false, "run webserver with HTML showing status")
 		fs.BoolVar(&statusArgs.active, "active", false, "filter output to only peers with active sessions (not applicable to web mode)")
+		fs.BoolVar(&statusArgs.self, "self", true, "show status of local machine")
 		fs.StringVar(&statusArgs.listen, "listen", "127.0.0.1:8384", "listen address; use port 0 for automatic")
 		fs.BoolVar(&statusArgs.browser, "browser", true, "Open a browser in web mode")
 		return fs
@@ -45,6 +46,7 @@ var statusArgs struct {
 	listen  string // in web mode, webserver address to listen on, empty means auto
 	browser bool   // in web mode, whether to open browser
 	active  bool   // in CLI mode, filter output to only peers with active sessions
+	self    bool   // in CLI mode, show status of local machine
 }
 
 func runStatus(ctx context.Context, args []string) error {
@@ -127,14 +129,10 @@ func runStatus(ctx context.Context, args []string) error {
 
 	var buf bytes.Buffer
 	f := func(format string, a ...interface{}) { fmt.Fprintf(&buf, format, a...) }
-	for _, peer := range st.Peers() {
-		ps := st.Peer[peer]
+	printPS := func(ps *ipnstate.PeerStatus) {
 		active := peerActive(ps)
-		if statusArgs.active && !active {
-			continue
-		}
 		f("%s %-7s %-15s %-18s tx=%8d rx=%8d ",
-			peer.ShortString(),
+			ps.PublicKey.ShortString(),
 			ps.OS,
 			ps.TailAddr,
 			ps.SimpleHostName(),
@@ -160,6 +158,18 @@ func runStatus(ctx context.Context, args []string) error {
 		}
 		f("\n")
 	}
+
+	if statusArgs.self && st.Self != nil {
+		printPS(st.Self)
+	}
+	for _, peer := range st.Peers() {
+		ps := st.Peer[peer]
+		active := peerActive(ps)
+		if statusArgs.active && !active {
+			continue
+		}
+		printPS(ps)
+	}
 	os.Stdout.Write(buf.Bytes())
 	return nil
 }

ipn/ipnstate/ipnstate.go

@@ -27,6 +27,8 @@ import (
 type Status struct {
 	BackendState string
 	TailscaleIPs []netaddr.IP // Tailscale IP(s) assigned to this node
+	Self         *PeerStatus
+
 	Peer map[key.Public]*PeerStatus
 	User map[tailcfg.UserID]tailcfg.UserProfile
 }
@@ -95,6 +97,13 @@ func (sb *StatusBuilder) Status() *Status {
 	return &sb.st
 }
 
+// SetSelfStatus sets the status of the local machine.
+func (sb *StatusBuilder) SetSelfStatus(ss *PeerStatus) {
+	sb.mu.Lock()
+	defer sb.mu.Unlock()
+	sb.st.Self = ss
+}
+
 // AddUser adds a user profile to the status.
 func (sb *StatusBuilder) AddUser(id tailcfg.UserID, up tailcfg.UserProfile) {
 	sb.mu.Lock()

wgengine/magicsock/magicsock.go

@@ -3034,6 +3034,21 @@ func (c *Conn) UpdateStatus(sb *ipnstate.StatusBuilder) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
 
+	ss := &ipnstate.PeerStatus{
+		PublicKey: c.privateKey.Public(),
+		Addrs:     c.lastEndpoints,
+	}
+	if c.netMap != nil {
+		ss.HostName = c.netMap.Hostinfo.Hostname
+		ss.OS = c.netMap.Hostinfo.OS
+	}
+	if c.derpMap != nil {
+		derpRegion, ok := c.derpMap.Regions[c.myDerp]
+		if ok {
+			ss.Relay = derpRegion.RegionCode
+		}
+	}
+
 	if c.netMap != nil {
 		for _, addr := range c.netMap.Addresses {
 			if (addr.IP.Is4() && addr.Mask != 32) || (addr.IP.Is6() && addr.Mask != 128) {
@@ -3041,9 +3056,11 @@ func (c *Conn) UpdateStatus(sb *ipnstate.StatusBuilder) {
 			}
 			if ip, ok := netaddr.FromStdIP(addr.IP.IP()); ok {
 				sb.AddTailscaleIP(ip)
+				ss.TailAddr = ip.String()
 			}
 		}
 	}
+	sb.SetSelfStatus(ss)
 
 	for dk, n := range c.nodeOfDisco {
 		ps := &ipnstate.PeerStatus{InMagicSock: true}