cmd/tailscale: add tailscale status region name, last write, consistently star

There's a lot of confusion around what tailscale status shows, so make it better:
show region names, last write time, and put stars around DERP too if active.

Now stars are always present if activity, and always somewhere.

cmd/tailscale/status.go

@@ -14,6 +14,7 @@
 	"net"
 	"net/http"
 	"os"
+	"time"
 
 	"github.com/peterbourgon/ff/v2/ffcli"
 	"github.com/toqueteos/webbrowser"
@@ -127,6 +128,15 @@ func runStatus(ctx context.Context, args []string) error {
 			ps.TxBytes,
 			ps.RxBytes,
 		)
+		// TODO: let server report this active bool instead
+		active := !ps.LastWrite.IsZero() && time.Since(ps.LastWrite) < 2*time.Minute
+		relay := ps.Relay
+		if active && relay != "" && ps.CurAddr == "" {
+			relay = "*" + relay + "*"
+		} else {
+			relay = " " + relay
+		}
+		f("%-6s", relay)
 		for i, addr := range ps.Addrs {
 			if i != 0 {
 				f(", ")

ipn/ipnstate/ipnstate.go

@@ -49,10 +49,12 @@ type PeerStatus struct {
 	// Endpoints:
 	Addrs   []string
 	CurAddr string // one of Addrs, or unique if roaming
+	Relay   string // DERP region
 
 	RxBytes       int64
 	TxBytes       int64
 	Created       time.Time // time registered with tailcontrol
+	LastWrite     time.Time // time last packet sent
 	LastSeen      time.Time // last seen to tailcontrol
 	LastHandshake time.Time // with local wireguard
 	KeepAlive     bool
@@ -135,6 +137,9 @@ func (sb *StatusBuilder) AddPeer(peer key.Public, st *PeerStatus) {
 	if v := st.HostName; v != "" {
 		e.HostName = v
 	}
+	if v := st.Relay; v != "" {
+		e.Relay = v
+	}
 	if v := st.UserID; v != 0 {
 		e.UserID = v
 	}
@@ -165,6 +170,9 @@ func (sb *StatusBuilder) AddPeer(peer key.Public, st *PeerStatus) {
 	if v := st.LastSeen; !v.IsZero() {
 		e.LastSeen = v
 	}
+	if v := st.LastWrite; !v.IsZero() {
+		e.LastWrite = v
+	}
 	if st.InNetworkMap {
 		e.InNetworkMap = true
 	}
@@ -211,28 +219,19 @@ func (st *Status) WriteHTML(w io.Writer) {
 	//f("<p><b>opts:</b> <code>%s</code></p>\n", html.EscapeString(fmt.Sprintf("%+v", opts)))
 
 	f("<table>\n<thead>\n")
-	f("<tr><th>Peer</th><th>Node</th><th>Owner</th><th>Rx</th><th>Tx</th><th>Handshake</th><th>Endpoints</th></tr>\n")
+	f("<tr><th>Peer</th><th>Node</th><th>Owner</th><th>Rx</th><th>Tx</th><th>Activity</th><th>Endpoints</th></tr>\n")
 	f("</thead>\n<tbody>\n")
 
 	now := time.Now()
 
-	// The tailcontrol server rounds LastSeen to 10 minutes. So we
-	// declare that a longAgo seen time of 15 minutes means
-	// they're not connected.
-	longAgo := now.Add(-15 * time.Minute)
-
 	for _, peer := range st.Peers() {
 		ps := st.Peer[peer]
-		var hsAgo string
-		if !ps.LastHandshake.IsZero() {
-			hsAgo = now.Sub(ps.LastHandshake).Round(time.Second).String() + " ago"
-		} else {
-			if ps.LastSeen.Before(longAgo) {
-				hsAgo = "<i>offline</i>"
-			} else if !ps.KeepAlive {
-				hsAgo = "on demand"
-			} else {
-				hsAgo = "<b>pending</b>"
+		var actAgo string
+		if !ps.LastWrite.IsZero() {
+			ago := now.Sub(ps.LastWrite)
+			actAgo = ago.Round(time.Second).String() + " ago"
+			if ago < 5*time.Minute {
+				actAgo = "<b>" + actAgo + "</b>"
 			}
 		}
 		var owner string
@@ -250,9 +249,20 @@ func (st *Status) WriteHTML(w io.Writer) {
 			html.EscapeString(owner),
 			ps.RxBytes,
 			ps.TxBytes,
-			hsAgo,
+			actAgo,
 		)
 		f("<td class=\"aright\">")
+		// TODO: let server report this active bool instead
+		active := !ps.LastWrite.IsZero() && time.Since(ps.LastWrite) < 2*time.Minute
+		relay := ps.Relay
+		if relay != "" {
+			if active && ps.CurAddr == "" {
+				f("🔗 <b>derp-%v</b><br>", html.EscapeString(relay))
+			} else {
+				f("derp-%v<br>", html.EscapeString(relay))
+			}
+		}
+
 		match := false
 		for _, addr := range ps.Addrs {
 			if addr == ps.CurAddr {

wgengine/magicsock/magicsock.go

@@ -686,6 +686,8 @@ func (as *AddrSet) appendDests(dsts []netaddr.IPPort, b []byte) (_ []netaddr.IPP
 	as.mu.Lock()
 	defer as.mu.Unlock()
 
+	as.lastSend = now
+
 	// Some internal invariant checks.
 	if len(as.addrs) != len(as.ipPorts) {
 		panic(fmt.Sprintf("lena %d != leni %d", len(as.addrs), len(as.ipPorts)))
@@ -2094,6 +2096,8 @@ type AddrSet struct {
 
 	mu sync.Mutex // guards following fields
 
+	lastSend time.Time
+
 	// roamAddr is non-nil if/when we receive a correctly signed
 	// WireGuard packet from an unexpected address. If so, we
 	// remember it and send responses there in the future, but
@@ -2308,6 +2312,26 @@ func (a *AddrSet) String() string {
 	return buf.String()
 }
 
+func (as *AddrSet) populatePeerStatus(ps *ipnstate.PeerStatus) {
+	as.mu.Lock()
+	defer as.mu.Unlock()
+
+	ps.LastWrite = as.lastSend
+	for i, ua := range as.addrs {
+		if ua.IP.Equal(derpMagicIP) {
+			continue
+		}
+		uaStr := ua.String()
+		ps.Addrs = append(ps.Addrs, uaStr)
+		if as.curAddr == i {
+			ps.CurAddr = uaStr
+		}
+	}
+	if as.roamAddr != nil {
+		ps.CurAddr = udpAddrDebugString(*as.roamAddrStd)
+	}
+}
+
 func (a *AddrSet) Addrs() []wgcfg.Endpoint {
 	var eps []wgcfg.Endpoint
 	for _, addr := range a.addrs {
@@ -2566,6 +2590,28 @@ func sbPrintAddr(sb *strings.Builder, a net.UDPAddr) {
 	fmt.Fprintf(sb, ":%d", a.Port)
 }
 
+func (c *Conn) derpRegionCodeOfAddrLocked(ipPort string) string {
+	_, portStr, err := net.SplitHostPort(ipPort)
+	if err != nil {
+		return ""
+	}
+	regionID, err := strconv.Atoi(portStr)
+	if err != nil {
+		return ""
+	}
+	return c.derpRegionCodeOfIDLocked(regionID)
+}
+
+func (c *Conn) derpRegionCodeOfIDLocked(regionID int) string {
+	if c.derpMap == nil {
+		return ""
+	}
+	if r, ok := c.derpMap.Regions[regionID]; ok {
+		return r.RegionCode
+	}
+	return ""
+}
+
 func (c *Conn) UpdateStatus(sb *ipnstate.StatusBuilder) {
 	c.mu.Lock()
 	defer c.mu.Unlock()
@@ -2574,6 +2620,7 @@ func (c *Conn) UpdateStatus(sb *ipnstate.StatusBuilder) {
 		ps := &ipnstate.PeerStatus{InMagicSock: true}
 		if node, ok := c.nodeOfDisco[dk]; ok {
 			ps.Addrs = append(ps.Addrs, node.Endpoints...)
+			ps.Relay = c.derpRegionCodeOfAddrLocked(node.DERP)
 		}
 		de.populatePeerStatus(ps)
 		sb.AddPeer(de.publicKey, ps)
@@ -2582,17 +2629,9 @@ func (c *Conn) UpdateStatus(sb *ipnstate.StatusBuilder) {
 	for k, as := range c.addrsByKey {
 		ps := &ipnstate.PeerStatus{
 			InMagicSock: true,
+			Relay:       c.derpRegionCodeOfIDLocked(as.derpID()),
 		}
-		for i, ua := range as.addrs {
-			uaStr := udpAddrDebugString(ua)
-			ps.Addrs = append(ps.Addrs, uaStr)
-			if as.curAddr == i {
-				ps.CurAddr = uaStr
-			}
-		}
-		if as.roamAddr != nil {
-			ps.CurAddr = udpAddrDebugString(*as.roamAddrStd)
-		}
+		as.populatePeerStatus(ps)
 		sb.AddPeer(k, ps)
 	}
 
@@ -3078,8 +3117,10 @@ func (de *discoEndpoint) populatePeerStatus(ps *ipnstate.PeerStatus) {
 		return
 	}
 
+	ps.LastWrite = de.lastSend
+
 	now := time.Now()
-	if udpAddr, _ := de.addrForSendLocked(now); !udpAddr.IsZero() {
+	if udpAddr, derpAddr := de.addrForSendLocked(now); !udpAddr.IsZero() && derpAddr.IsZero() {
 		ps.CurAddr = udpAddr.String()
 	}
 }