private void destConnectTimer_Elapsed(object sender, ElapsedEventArgs e)
{
var timer = (ServerTimer)sender;
timer.Elapsed -= destConnectTimer_Elapsed;
timer.Enabled = false;
timer.Dispose();
if (_destConnected || _closed)
{
return;
}
var session = timer.Session;
Server server = timer.Server;
IStrategy strategy = _controller.GetCurrentStrategy();
strategy?.SetFailure(server);
Logging.Info($"{server.FriendlyName()} timed out");
session.Remote.Close();
Close();
}
private async Task StartConnect()
{
SaeaAwaitable serverSaea = null;
try
{
CreateRemote();
_serverSocket = new Socket(SocketType.Stream, ProtocolType.Tcp);
_serverSocket.SetSocketOption(SocketOptionLevel.Tcp, SocketOptionName.NoDelay, true);
_serverSocket.SetTFO();
// encrypt and attach encrypted buffer to ConnectAsync
serverSaea = _argsPool.Rent();
var realSaea = serverSaea.Saea;
var encryptedbufLen = -1;
Logging.Dump("StartConnect(): enc addrBuf", _addrBuf, _addrBufLength);
DoEncrypt(_addrBuf, _addrBufLength, realSaea.Buffer, out encryptedbufLen);
Logging.Debug("StartConnect(): addrBuf enc len " + encryptedbufLen);
if (_remainingBytesLen > 0)
{
Logging.Debug($"StartConnect(): remainingBytesLen: {_remainingBytesLen}");
var encRemainingBufLen = -1;
byte[] tmp = new byte[4096];
Logging.Dump("StartConnect(): enc remaining", _remainingBytes, _remainingBytesLen);
DoEncrypt(_remainingBytes, _remainingBytesLen, tmp, out encRemainingBufLen);
Logging.Debug("StartConnect(): remaining enc len " + encRemainingBufLen);
Buffer.BlockCopy(tmp, 0, realSaea.Buffer, encryptedbufLen, encRemainingBufLen);
encryptedbufLen += encRemainingBufLen;
}
Logging.Debug("actual enc buf len " + encryptedbufLen);
realSaea.RemoteEndPoint = SocketUtil.GetEndPoint(_server.server, _server.server_port);
realSaea.SetBuffer(0, encryptedbufLen);
_startConnectTime = DateTime.Now;
var err = await _serverSocket.ConnectAsync(serverSaea);
if (err != SocketError.Success)
{
Logging.Error($"StartConnect: {err}");
Close();
return;
}
Logging.Debug("remote connected");
if (serverSaea.Saea.BytesTransferred != encryptedbufLen)
{
// not sent all data, it may caused by TFO, disable it
Logging.Info("Disable TCP Fast Open due to initial send failure");
Program.DisableTFO();
Close();
return;
}
_argsPool.Return(serverSaea);
serverSaea = null;
if (_config.isVerboseLogging)
{
Logging.Info($"Socket connected to ss server: {_server.FriendlyName()}");
}
var latency = DateTime.Now - _startConnectTime;
_controller.GetCurrentStrategy()?.UpdateLatency(_server, latency);
_tcprelay.UpdateLatency(_server, latency);
_startReceivingTime = DateTime.Now;
Task.Factory.StartNew(StartPipe, TaskCreationOptions.PreferFairness).Forget();
}
catch (AggregateException agex)
{
foreach (var ex in agex.InnerExceptions)
{
Logging.LogUsefulException(ex);
}
Close();
}
catch (Exception e)
{
Logging.LogUsefulException(e);
Close();
}
finally
{
_argsPool.Return(serverSaea);
serverSaea = null;
}
}