temporary workaround for Tor command in socks.

proxy/socks/protocol.go

@@ -17,6 +17,8 @@ const (
 	cmdTCPConnect    = 0x01
 	cmdTCPBind       = 0x02
 	cmdUDPPort       = 0x03
+	cmdTorResolve    = 0xF0
+	cmdTorResolvePTR = 0xF1
 
 	socks4RequestGranted  = 90
 	socks4RequestRejected = 91
@@ -131,7 +133,8 @@ func (s *ServerSession) Handshake(reader io.Reader, writer io.Writer) (*protocol
 
 		cmd := buffer.Byte(1)
 		switch cmd {
-		case cmdTCPConnect:
+		case cmdTCPConnect, cmdTorResolve, cmdTorResolvePTR:
+			// We don't have a solution for Tor case now. Simply treat it as connect command.
 			request.Command = protocol.RequestCommandTCP
 		case cmdUDPPort:
 			if !s.config.UdpEnabled {