private void PipeConnectionReceiveCallback(IAsyncResult ar)
{
if (_closed)
{
return;
}
try
{
if (connection == null)
{
return;
}
int bytesRead = connection.EndReceive(ar);
_totalWrite += bytesRead;
if (bytesRead > 0)
{
int atyp = _connetionRecvBuffer[0];
string dst_addr;
int dst_port;
switch (atyp)
{
case 1: // IPv4 address, 4 bytes
dst_addr = new IPAddress(_connetionRecvBuffer.Skip(1).Take(4).ToArray()).ToString();
dst_port = (_connetionRecvBuffer[5] << 8) + _connetionRecvBuffer[6];
if (_config.isVerboseLogging)
{
Logging.Info($"connect to {dst_addr}:{dst_port}");
}
break;
case 3: // domain name, length + str
int len = _connetionRecvBuffer[1];
dst_addr = System.Text.Encoding.UTF8.GetString(_connetionRecvBuffer, 2, len);
dst_port = (_connetionRecvBuffer[len + 2] << 8) + _connetionRecvBuffer[len + 3];
if (_config.isVerboseLogging)
{
Logging.Info($"connect to {dst_addr}:{dst_port}");
}
break;
case 4: // IPv6 address, 16 bytes
dst_addr = new IPAddress(_connetionRecvBuffer.Skip(1).Take(16).ToArray()).ToString();
dst_port = (_connetionRecvBuffer[17] << 8) + _connetionRecvBuffer[18];
if (_config.isVerboseLogging)
{
Logging.Info($"connect to [{dst_addr}]:{dst_port}");
}
break;
}
int bytesToSend;
lock (_encryptionLock)
{
if (_closed)
{
return;
}
encryptor.Encrypt(_connetionRecvBuffer, bytesRead, _connetionSendBuffer, out bytesToSend);
}
_tcprelay.UpdateOutboundCounter(server, bytesToSend);
_startSendingTime = DateTime.Now;
_bytesToSend = bytesToSend;
remote.BeginSend(_connetionSendBuffer, 0, bytesToSend, SocketFlags.None, new AsyncCallback(PipeRemoteSendCallback), null);
IStrategy strategy = controller.GetCurrentStrategy();
strategy?.UpdateLastWrite(server);
}
else
{
remote.Shutdown(SocketShutdown.Send);
_remoteShutdown = true;
CheckClose();
}
}
catch (Exception e)
{
Logging.LogUsefulException(e);
Close();
}
}
