public ClientConnection(HostInfo clientInfo, TcpClient connection, NetworkStream stream, TargetConnection mainTarget, Dictionary <HostInfo, TargetConnection> outputTargets)
{
ClientInfo = clientInfo;
Connection = connection;
Stream = stream;
MainTarget = mainTarget;
OutputTargets = outputTargets;
}
private void OnTcpConnection(IAsyncResult asyncResult)
{
if (!running)
{
return;
}
try
{
// Accept client
TcpClient client = tcpListener.EndAcceptTcpClient(asyncResult);
IPEndPoint clientEndPoint = client.Client.RemoteEndPoint as IPEndPoint;
HostInfo clientInfo = new HostInfo(clientEndPoint.Address.ToString(), (ushort)clientEndPoint.Port);
new Thread(() =>
{
// Connect to main server
HostInfo mainTargetInfo = targetBalancer(clientInfo);
if (mainTargetInfo == null)
{
return;
}
TargetConnection mainTarget;
HostConnected?.Invoke(this, clientInfo);
try
{
TcpClient mainTargetConnection = new TcpClient(mainTargetInfo.Hostname, mainTargetInfo.Port);
mainTarget = new TargetConnection(mainTargetInfo, mainTargetConnection, mainTargetConnection.GetStream());
}
catch (Exception e)
{
logger.Warn($"Could not connect to output {mainTargetInfo.Hostname}:{mainTargetInfo.Port}. Skipping connection. {e}");
HostDisconnected?.Invoke(this, clientInfo);
return;
}
Dictionary <HostInfo, TargetConnection> outputTargets = targetCloner(clientInfo).ToDictionary <HostInfo, HostInfo, TargetConnection>(t => t, t => null);
ClientConnection clientConnection = new ClientConnection(clientInfo, client, client.GetStream(), mainTarget, outputTargets);
activeConnections.Add(clientConnection);
// Connect to output targets
foreach (var outputInfo in clientConnection.OutputTargets.ToArray())
{
try
{
TcpClient outputClient = new TcpClient();
Task connectTask = outputClient.ConnectAsync(outputInfo.Key.Hostname, outputInfo.Key.Port);
if (!connectTask.Wait(Program.Timeout))
{
logger.Warn($"Could not connect to output {outputInfo.Key.Hostname}:{outputInfo.Key.Port} after {Program.Timeout}. Output will be skipped");
continue;
}
TargetConnection outputConnection = new TargetConnection(outputInfo.Key, outputClient, outputClient.GetStream());
clientConnection.OutputTargets[outputInfo.Key] = outputConnection;
}
catch (Exception e)
{
logger.Warn($"Could not connect to output {outputInfo.Key.Hostname}:{outputInfo.Key.Port}. Output will be skipped. {e}");
}
}
// Client > Target
new Thread(() =>
{
Exception exception = null;
try
{
byte[] buffer = new byte[bufferSize];
while (true)
{
int read = clientConnection.Stream.Read(buffer, 0, buffer.Length);
if (read == 0)
{
break;
}
foreach (var targetInfo in outputTargets.ToArray())
{
if (targetInfo.Value == null)
{
continue;
}
ulong totalSize = (ulong)targetInfo.Value.Buffers.Count * bufferSize + bufferSize;
if (totalSize > Program.BufferSize)
{
logger.Warn($"Output target {targetInfo.Key.Hostname}:{targetInfo.Key.Port} has reach its maximum buffer size. Output will be skipped");
outputTargets[targetInfo.Key] = null;
Try(targetInfo.Value.Connection.Close);
continue;
}
targetInfo.Value.Buffers.Enqueue(new ArraySegment <byte>(buffer, 0, read));
}
mainTarget.Stream.Write(buffer, 0, read);
mainTarget.Stream.Flush();
buffer = new byte[bufferSize];
}
}
catch (Exception e)
{
exception = e;
}
finally
{
Try(mainTarget.Connection.Close);
foreach (TargetConnection targetConnection in outputTargets.Values)
{
if (targetConnection != null)
{
Try(targetConnection.Connection.Close);
}
}
lock (activeConnections)
{
if (activeConnections.Remove(clientConnection))
{
if (exception != null)
{
if (!(exception is IOException) || !(exception.InnerException is SocketException))
{
logger.Warn("Exception while reading from client. " + exception);
}
}
HostDisconnected?.Invoke(this, clientConnection.ClientInfo);
}
}
}
}).Start();
// Target > Client
new Thread(() =>
{
Exception exception = null;
try
{
byte[] buffer = new byte[bufferSize];
while (true)
{
int read = mainTarget.Stream.Read(buffer, 0, buffer.Length);
if (read == 0)
{
break;
}
clientConnection.Stream.Write(buffer, 0, read);
clientConnection.Stream.Flush();
}
}
catch (Exception e)
{
exception = e;
}
finally
{
Try(client.Close);
foreach (TargetConnection targetConnection in outputTargets.Values)
{
if (targetConnection != null)
{
Try(targetConnection.Connection.Close);
}
}
lock (activeConnections)
{
if (activeConnections.Remove(clientConnection))
{
if (exception != null)
{
if (!(exception is IOException) || !(exception.InnerException is SocketException))
{
logger.Warn("Exception while reading from target. " + exception);
}
}
HostDisconnected?.Invoke(this, clientConnection.ClientInfo);
}
}
}
}).Start();
// Flush output target connections
byte[] readBuffer = new byte[bufferSize];
while (true)
{
int outputTargetCount = 0;
int dequeuedBuffers = 0;
foreach (var outputInfo in clientConnection.OutputTargets.ToArray())
{
if (outputInfo.Value == null)
{
continue;
}
outputTargetCount++;
try
{
ArraySegment <byte> buffer;
while (outputInfo.Value.Buffers.TryDequeue(out buffer))
{
dequeuedBuffers++;
outputInfo.Value.Stream.Write(buffer.Array, buffer.Offset, buffer.Count);
outputInfo.Value.Stream.Flush();
}
while (outputInfo.Value.Stream.DataAvailable)
{
outputInfo.Value.Stream.Read(readBuffer, 0, readBuffer.Length);
}
}
catch
{
logger.Warn($"Could not send buffer to output target {outputInfo.Key.Hostname}:{outputInfo.Key.Port}. Output will be skipped");
outputTargets[outputInfo.Key] = null;
Try(outputInfo.Value.Connection.Close);
continue;
}
}
if (outputTargetCount == 0)
{
break;
}
if (dequeuedBuffers == 0)
{
Thread.Sleep(10);
}
}
}).Start();
}
catch (Exception e)
{
logger.Warn($"Error while processing TCP client. " + e);
}
tcpListener.BeginAcceptTcpClient(OnTcpConnection, null);
}