Renci.SshNet.ForwardedPortDynamic.HandleSocks C# (CSharp) Method

        private bool HandleSocks(IChannelDirectTcpip channel, Socket clientSocket, TimeSpan timeout)
        {
            // create eventhandler which is to be invoked to interrupt a blocking receive
            // when we're closing the forwarded port
            EventHandler closeClientSocket = (_, args) => CloseClientSocket(clientSocket);

            Closing += closeClientSocket;

            try
            {
                var version = SocketAbstraction.ReadByte(clientSocket, timeout);
                switch (version)
                {
                    case -1:
                        // SOCKS client closed connection
                        return false;
                    case 4:
                        return HandleSocks4(clientSocket, channel, timeout);
                    case 5:
                        return HandleSocks5(clientSocket, channel, timeout);
                    default:
                        throw new NotSupportedException(string.Format("SOCKS version {0} is not supported.", version));
                }
            }
            catch (SocketException ex)
            {
                // ignore exception thrown by interrupting the blocking receive as part of closing
                // the forwarded port
                if (ex.SocketErrorCode != SocketError.Interrupted)
                {
                    RaiseExceptionEvent(ex);
                }
                return false;
            }
            finally
            {
                // interrupt of blocking receive is now handled by channel (SOCKS4 and SOCKS5)
                // or no longer necessary
                Closing -= closeClientSocket;
            }

        }