private static void Main(string[] args)
{
EnvironmentOptions options = BuildEnvironmentOptions(args);
if (options == null)
{
return;
}
IPAddress ipAddress = IPAddress.Any;
var listeningSocket = new Socket(ipAddress.AddressFamily, SocketType.Stream, ProtocolType.IP);
listeningSocket.Bind(new IPEndPoint(ipAddress, options.ListenOnPort));
listeningSocket.Listen(0);
var logger = BuildLogger(options);
AppDomain.CurrentDomain.ProcessExit += (sender, eventArgs) => logger.ShuttingDown();
while (true)
{
Socket clientSocket = null;
Socket relaySocket = null;
Task<Socket>.Factory.FromAsync(listeningSocket.BeginAccept, listeningSocket.EndAccept, null)
.ContinueWith(task =>
{
clientSocket = task.Result;
return Task<IPHostEntry>.Factory.FromAsync(Dns.BeginGetHostEntry,
Dns.EndGetHostEntry,
options.ForwardToHostAddress,
null);
})
.Unwrap()
.ContinueWith(task =>
{
IPHostEntry relayHostEntry = task.Result;
IPAddress relayHostIpAddress = relayHostEntry.AddressList.First();
relaySocket = new Socket(relayHostIpAddress.AddressFamily,
SocketType.Stream,
ProtocolType.IP);
return Task.Factory.FromAsync(relaySocket.BeginConnect,
relaySocket.EndConnect,
relayHostEntry.AddressList,
options.ForwardToPort,
null);
})
.Unwrap()
.ContinueWith(task =>
{
var exchange = new TcpExchangeHub(logger);
exchange.WireExchange(relaySocket, clientSocket);
})
.Wait();
}
}
public void ClientConnected(TcpExchangeHub hub)
{
Interlocked.Increment(ref this._connectedClients);
}
public void Disconnected(TcpExchangeHub hub, TcpRelayDirection direction)
{
if (direction == TcpRelayDirection.ClientToRelay)
{
Interlocked.Decrement(ref this._connectedClients);
}
}
public void TransmitData(TcpExchangeHub hub, TcpRelayDirection direction, byte[] data, int count)
{
if (!this._transmissionSubject.HasObservers)
{
return;
}
var subject = new TransmissionSummary
{
Hub = hub,
ByteCount = count,
Direction = direction,
};
this._transmissionSubject.OnNext(subject);
}