style: remove unused code and comments

app/tun/handler_tcp.go

@@ -55,19 +55,6 @@ func HandleTCP(handle func(tun_net.TCPConn)) StackOption {
 
 			// TODO: set sockopt
 
-			// tcpHandler := &TCPHandler{
-			// 	ctx:           ctx,
-			// 	dispatcher:    dispatcher,
-			// 	policyManager: policyManager,
-			// 	config:        config,
-			// 	stack:         s,
-			// }
-
-			// if err := tcpHandler.Handle(gonet.NewTCPConn(wg, linkedEndpoint)); err != nil {
-			// 	// TODO: log
-			// 	// return newError("failed to handle tcp connection").Base(err)
-			// }
-
 			tcpConn := &tcpConn{
 				TCPConn: gonet.NewTCPConn(wg, linkedEndpoint),
 				id:      r.ID(),
@@ -103,7 +90,7 @@ func (h *TCPHandler) Handle(conn tun_net.TCPConn) error {
 	dest := net.TCPDestination(tun_net.AddressFromTCPIPAddr(id.LocalAddress), net.Port(id.LocalPort))
 	src := net.TCPDestination(tun_net.AddressFromTCPIPAddr(id.RemoteAddress), net.Port(id.RemotePort))
 	ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
-		From:   src, // Parse IpAddr to Destination
+		From:   src,
 		To:     dest,
 		Status: log.AccessAccepted,
 		Reason: "",

app/tun/handler_udp.go

@@ -75,7 +75,6 @@ func (h *UDPHandler) Handle(conn tun_net.UDPConn) error {
 	defer conn.Close()
 	id := conn.ID()
 	ctx := session.ContextWithInbound(h.ctx, &session.Inbound{Tag: h.config.Tag})
-	packetConn := conn.(net.PacketConn)
 
 	udpDispatcherConstructor := udp.NewSplitDispatcher
 	switch h.config.PacketEncoding {
@@ -90,7 +89,7 @@ func (h *UDPHandler) Handle(conn tun_net.UDPConn) error {
 	src := net.UDPDestination(tun_net.AddressFromTCPIPAddr(id.RemoteAddress), net.Port(id.RemotePort))
 
 	udpServer := udpDispatcherConstructor(h.dispatcher, func(ctx context.Context, packet *udp_proto.Packet) {
-		if _, err := packetConn.WriteTo(packet.Payload.Bytes(), &net.UDPAddr{
+		if _, err := conn.WriteTo(packet.Payload.Bytes(), &net.UDPAddr{
 			IP:   src.Address.IP(),
 			Port: int(src.Port),
 		}); err != nil {
@@ -104,7 +103,7 @@ func (h *UDPHandler) Handle(conn tun_net.UDPConn) error {
 			return nil
 		default:
 			var buffer [2048]byte
-			n, _, err := packetConn.ReadFrom(buffer[:])
+			n, _, err := conn.ReadFrom(buffer[:])
 			if err != nil {
 				return newError("failed to read UDP packet").Base(err)
 			}

app/tun/net/net.go

@@ -15,6 +15,7 @@ type TCPConn interface {
 
 type UDPConn interface {
 	net.Conn
+	net.PacketConn
 
 	ID() *stack.TransportEndpointID
 }