Audit changes.

peer/app.go

@@ -1,9 +1,12 @@
 package peer
 
 import (
+	"fmt"
+	"log"
 	"net/netip"
 	"os"
 	"os/signal"
+	"strings"
 	"syscall"
 	"time"
 
@@ -82,6 +85,8 @@ func (a *App) Run() error {
 	signal.Notify(sig, syscall.SIGTERM, syscall.SIGINT)
 	defer signal.Stop(sig)
 
+	tickCount := 0
+
 	for {
 		select {
 		case p := <-a.hubAddCh:
@@ -94,6 +99,11 @@ func (a *App) Run() error {
 			a.onMulticastDiscovery(e)
 		case <-ticker.C:
 			a.onTick()
+			tickCount++
+			if tickCount%8 == 0 {
+				a.logNetworkState()
+			}
+
 		case <-sig:
 			return a.onShutdown()
 		}
@@ -103,3 +113,27 @@ func (a *App) Run() error {
 func (a *App) onShutdown() error {
 	return wginterface.Delete(a.dev.Name())
 }
+
+func (a *App) logNetworkState() {
+	var b strings.Builder
+	fmt.Fprintf(&b, "Network state (self: %s public=%v):\n", a.vpnIP, a.isPublic)
+	fmt.Fprintf(&b, "  IPv4: %v\n", a.selfV4)
+	fmt.Fprintf(&b, "  IPv6: %v\n", a.selfV6)
+
+	b.WriteString("Peers:\n")
+
+	for _, p := range a.peersByIP {
+
+		switch p.State {
+		case StateDirect:
+			fmt.Fprintf(&b, "  %24s %s DIRECT  @ %s rtt=%s\n",
+				p.Name, p.VPNIP, p.WGEndpoint(), p.RTT.Round(time.Millisecond))
+		case StateProbing:
+			fmt.Fprintf(&b, "  %24s %s PROBING @ %s\n",
+				p.Name, p.VPNIP, p.PreferredEndpoint())
+		case StateRelayed:
+			fmt.Fprintf(&b, "  %24s %s RELAYED\n", p.Name, p.VPNIP)
+		}
+	}
+	log.Print(b.String())
+}

peer/on_ping.go

@@ -1,6 +1,7 @@
 package peer
 
 import (
+	"log"
 	"net/netip"
 	"time"
 
@@ -37,9 +38,15 @@ func (a *App) onPing(e PingEvent) {
 	if peer.State == StateDirect {
 		if dst := e.ping.Dst; dst.IsValid() {
 			if dst.Addr().Is4() {
-				a.selfV4 = dst
+				if dst != a.selfV4 {
+					log.Printf("Local IPv4 updated: %s -> %s", a.selfV4, dst)
+					a.selfV4 = dst
+				}
 			} else {
-				a.selfV6 = dst
+				if dst != a.selfV6 {
+					log.Printf("Local IPv6 updated: %s -> %s", a.selfV6, dst)
+					a.selfV6 = dst
+				}
 			}
 		}
 		return