Improve local DNS server

experimental/libbox/config.go

@@ -116,6 +116,10 @@ func (s *platformInterfaceStub) FindProcessInfo(ctx context.Context, network str
 	return nil, os.ErrInvalid
 }
 
+func (s *platformInterfaceStub) SendNotification(notification *platform.Notification) error {
+	return nil
+}
+
 type interfaceMonitorStub struct{}
 
 func (s *interfaceMonitorStub) Start() error {
@@ -145,8 +149,11 @@ func (s *interfaceMonitorStub) RegisterCallback(callback tun.DefaultInterfaceUpd
 func (s *interfaceMonitorStub) UnregisterCallback(element *list.Element[tun.DefaultInterfaceUpdateCallback]) {
 }
 
-func (s *platformInterfaceStub) SendNotification(notification *platform.Notification) error {
-	return nil
+func (s *interfaceMonitorStub) RegisterMyInterface(interfaceName string) {
+}
+
+func (s *interfaceMonitorStub) MyInterface() string {
+	return ""
 }
 
 func FormatConfig(configContent string) (*StringBox, error) {

experimental/libbox/monitor.go

@@ -15,9 +15,10 @@ var (
 
 type platformDefaultInterfaceMonitor struct {
 	*platformInterfaceWrapper
-	element   *list.Element[tun.NetworkUpdateCallback]
-	callbacks list.List[tun.DefaultInterfaceUpdateCallback]
-	logger    logger.Logger
+	logger      logger.Logger
+	element     *list.Element[tun.NetworkUpdateCallback]
+	callbacks   list.List[tun.DefaultInterfaceUpdateCallback]
+	myInterface string
 }
 
 func (m *platformDefaultInterfaceMonitor) Start() error {
@@ -102,3 +103,15 @@ func (m *platformDefaultInterfaceMonitor) updateDefaultInterface(interfaceName s
 		callback(newInterface, 0)
 	}
 }
+
+func (m *platformDefaultInterfaceMonitor) RegisterMyInterface(interfaceName string) {
+	m.defaultInterfaceAccess.Lock()
+	defer m.defaultInterfaceAccess.Unlock()
+	m.myInterface = interfaceName
+}
+
+func (m *platformDefaultInterfaceMonitor) MyInterface() string {
+	m.defaultInterfaceAccess.Lock()
+	defer m.defaultInterfaceAccess.Unlock()
+	return m.myInterface
+}

experimental/libbox/service.go

@@ -164,6 +164,7 @@ func (w *platformInterfaceWrapper) OpenTun(options *tun.Options, platformOptions
 	if err != nil {
 		return nil, E.Cause(err, "query tun name")
 	}
+	options.InterfaceMonitor.RegisterMyInterface(options.Name)
 	dupFd, err := dup(int(tunFd))
 	if err != nil {
 		return nil, E.Cause(err, "dup tun file descriptor")