diff --git a/TCPMode/demoWeb.go b/TCPMode/demoWeb.go
index 132fb20..3e99213 100644
--- a/TCPMode/demoWeb.go
+++ b/TCPMode/demoWeb.go
@@ -16,8 +16,7 @@ type demoWeb struct {
 	closingChan chan struct{}
 	closedChan  chan struct{}
 
-	listener Interface
-	server   net.Listener
+	listener Listener
 }
 
 func (s *demoWeb) server_handle(conn net.Conn) {
@@ -49,7 +48,7 @@ func (s *demoWeb) server_main() {
 	defer s.worker.Done()
 
 	for {
-		conn, err := s.server.Accept()
+		conn, err := s.listener.Accept()
 		if err != nil {
 			select {
 			case <-s.closingChan:
@@ -64,7 +63,7 @@ func (s *demoWeb) server_main() {
 }
 
 func NewDemoWeb(rpfc routerPortForward.Config, port int) (Interface, error) {
-	listener, server, err := NewListener(rpfc, port)
+	listener, err := NewListener(rpfc, port)
 	if err != nil {
 		return nil, err
 	}
@@ -77,7 +76,6 @@ func NewDemoWeb(rpfc routerPortForward.Config, port int) (Interface, error) {
 		make(chan struct{}),
 
 		listener,
-		server,
 	}
 
 	go s.server_main()
diff --git a/TCPMode/mode.go b/TCPMode/interface.go
similarity index 100%
rename from TCPMode/mode.go
rename to TCPMode/interface.go
diff --git a/TCPMode/listener.go b/TCPMode/listener.go
index 6f6bd67..9448910 100644
--- a/TCPMode/listener.go
+++ b/TCPMode/listener.go
@@ -9,34 +9,39 @@ import (
 	"github.com/hzyitc/mnh/routerPortForward"
 )
 
+type Listener interface {
+	Interface
+	net.Listener
+}
+
 type listener struct {
 	port int
 
 	closingChan chan struct{}
 	closedChan  chan struct{}
 
-	server net.Listener
-	reuse  Interface
+	net.Listener
+	reuse Interface
 }
 
-func NewListener(rpfc routerPortForward.Config, port int) (Interface, net.Listener, error) {
+func NewListener(rpfc routerPortForward.Config, port int) (Listener, error) {
 	local := "0.0.0.0:" + strconv.Itoa(port)
 	server, err := reuseport.Listen("tcp", local)
 	if err != nil {
-		return nil, nil, err
+		return nil, err
 	}
 
 	addr, err := net.ResolveTCPAddr("tcp", server.Addr().String())
 	if err != nil {
 		server.Close()
-		return nil, nil, err
+		return nil, err
 	}
 	port = addr.Port
 
 	reuse, err := NewReuse(rpfc, port)
 	if err != nil {
 		server.Close()
-		return nil, nil, err
+		return nil, err
 	}
 
 	s := &listener{
@@ -49,7 +54,7 @@ func NewListener(rpfc routerPortForward.Config, port int) (Interface, net.Listen
 		reuse,
 	}
 
-	return s, server, nil
+	return s, nil
 }
 
 func (s *listener) Dial(addr string) (net.Conn, error) {
@@ -70,7 +75,7 @@ func (s *listener) Close() error {
 	close(s.closingChan)
 
 	err := s.reuse.Close()
-	err2 := s.server.Close()
+	err2 := s.Listener.Close()
 
 	close(s.closedChan)
 	if err != nil {
diff --git a/TCPMode/proxy.go b/TCPMode/proxy.go
index 92438c4..d9419d4 100644
--- a/TCPMode/proxy.go
+++ b/TCPMode/proxy.go
@@ -17,8 +17,7 @@ type proxy struct {
 	closingChan chan struct{}
 	closedChan  chan struct{}
 
-	listener Interface
-	server   net.Listener
+	listener Listener
 }
 
 func (s *proxy) server_handle(conn net.Conn) {
@@ -68,7 +67,7 @@ func (s *proxy) server_main() {
 	defer s.worker.Done()
 
 	for {
-		conn, err := s.server.Accept()
+		conn, err := s.listener.Accept()
 		if err != nil {
 			select {
 			case <-s.closingChan:
@@ -88,7 +87,7 @@ func NewProxy(rpfc routerPortForward.Config, port int, service string) (Interfac
 		return nil, err
 	}
 
-	listener, server, err := NewListener(rpfc, port)
+	listener, err := NewListener(rpfc, port)
 	if err != nil {
 		return nil, err
 	}
@@ -102,7 +101,6 @@ func NewProxy(rpfc routerPortForward.Config, port int, service string) (Interfac
 		make(chan struct{}),
 
 		listener,
-		server,
 	}
 
 	go s.server_main()
diff --git a/TCPProtocol/protocol.go b/TCPProtocol/interface.go
similarity index 100%
rename from TCPProtocol/protocol.go
rename to TCPProtocol/interface.go