fix: obsaddr: do not record observations over relayed conn

p2p/protocol/identify/obsaddr.go

@@ -335,6 +335,11 @@ func (o *ObservedAddrManager) worker() {
 	}
 }
 
+func isRelayedAddress(a ma.Multiaddr) bool {
+	_, err := a.ValueForProtocol(ma.P_CIRCUIT)
+	return err == nil
+}
+
 func (o *ObservedAddrManager) shouldRecordObservation(conn connMultiaddrs, observed ma.Multiaddr) (shouldRecord bool, localTW thinWaist, observedTW thinWaist) {
 	if conn == nil || observed == nil {
 		return false, thinWaist{}, thinWaist{}
@@ -350,6 +355,12 @@ func (o *ObservedAddrManager) shouldRecordObservation(conn connMultiaddrs, obser
 		return false, thinWaist{}, thinWaist{}
 	}
 
+	// Ignore p2p-circuit addresses. These are the observed address of the relay.
+	// Not useful for us.
+	if isRelayedAddress(observed) {
+		return false, thinWaist{}, thinWaist{}
+	}
+
 	// we should only use ObservedAddr when our connection's LocalAddr is one
 	// of our ListenAddrs. If we Dial out using an ephemeral addr, knowing that
 	// address's external mapping is not very useful because the port will not be
@@ -410,7 +421,7 @@ func (o *ObservedAddrManager) maybeRecordObservation(conn connMultiaddrs, observ
 	if !shouldRecord {
 		return
 	}
-	log.Debugw("added own observed listen addr", "observed", observed)
+	log.Debugw("added own observed listen addr", "conn", conn, "observed", observed)
 
 	o.mu.Lock()
 	defer o.mu.Unlock()

p2p/protocol/identify/obsaddr_glass_test.go

@@ -53,6 +53,24 @@ func TestShouldRecordObservationWithWebTransport(t *testing.T) {
 	require.True(t, shouldRecord)
 }
 
+func TestShouldNotRecordObservationWithRelayedAddr(t *testing.T) {
+	listenAddr := ma.StringCast("/ip4/1.2.3.4/udp/8888/quic-v1/p2p-circuit")
+	ifaceAddr := ma.StringCast("/ip4/10.0.0.2/udp/9999/quic-v1")
+	listenAddrs := func() []ma.Multiaddr { return []ma.Multiaddr{listenAddr} }
+	ifaceListenAddrs := func() ([]ma.Multiaddr, error) { return []ma.Multiaddr{ifaceAddr}, nil }
+	addrs := func() []ma.Multiaddr { return []ma.Multiaddr{listenAddr} }
+
+	c := &mockConn{
+		local:  listenAddr,
+		remote: ma.StringCast("/ip4/1.2.3.6/udp/1236/quic-v1/p2p-circuit"),
+	}
+	observedAddr := ma.StringCast("/ip4/1.2.3.4/udp/1231/quic-v1/p2p-circuit")
+	o, err := NewObservedAddrManager(listenAddrs, addrs, ifaceListenAddrs, normalize)
+	require.NoError(t, err)
+	shouldRecord, _, _ := o.shouldRecordObservation(c, observedAddr)
+	require.False(t, shouldRecord)
+}
+
 func TestShouldRecordObservationWithNAT64Addr(t *testing.T) {
 	listenAddr1 := ma.StringCast("/ip4/0.0.0.0/tcp/1234")
 	ifaceAddr1 := ma.StringCast("/ip4/10.0.0.2/tcp/4321")