Add ping support for WireGuard endpoint

transport/wireguard/device_system.go

@@ -28,16 +28,36 @@ type systemDevice struct {
 	batchDevice tun.LinuxTUN
 	events      chan wgTun.Event
 	closeOnce   sync.Once
+	addr4       netip.Addr
+	addr6       netip.Addr
 }
 
 func newSystemDevice(options DeviceOptions) (*systemDevice, error) {
 	if options.Name == "" {
 		options.Name = tun.CalculateInterfaceName("wg")
 	}
+	var inet4Address netip.Addr
+	var inet6Address netip.Addr
+	if len(options.Address) > 0 {
+		if prefix := common.Find(options.Address, func(it netip.Prefix) bool {
+			return it.Addr().Is4()
+		}); prefix.IsValid() {
+			inet4Address = prefix.Addr()
+		}
+	}
+	if len(options.Address) > 0 {
+		if prefix := common.Find(options.Address, func(it netip.Prefix) bool {
+			return it.Addr().Is6()
+		}); prefix.IsValid() {
+			inet6Address = prefix.Addr()
+		}
+	}
 	return &systemDevice{
 		options: options,
 		dialer:  options.CreateDialer(options.Name),
 		events:  make(chan wgTun.Event, 1),
+		addr4:   inet4Address,
+		addr6:   inet6Address,
 	}, nil
 }
 
@@ -49,6 +69,14 @@ func (w *systemDevice) ListenPacket(ctx context.Context, destination M.Socksaddr
 	return w.dialer.ListenPacket(ctx, destination)
 }
 
+func (w *systemDevice) Inet4Address() netip.Addr {
+	return w.addr4
+}
+
+func (w *systemDevice) Inet6Address() netip.Addr {
+	return w.addr6
+}
+
 func (w *systemDevice) SetDevice(device *device.Device) {
 }