public void Dispose()
{
if (InternalSocketServer != null && !IsDisposed)
{
IsDisposed = true;
InternalSocketServer.Disconnect(false);
InternalSocketServer.Dispose();
}
}
private void CreateInternalServer()
{
InternalSocketServer = CreateSocketServer();
InternalSocketServer.Bind(new IPEndPoint(IPAddress.Loopback, 0));
InternalSocketPort = ((IPEndPoint)(InternalSocketServer.LocalEndPoint)).Port;
HttpProxyURL = new Uri($"http://127.0.0.1:{InternalSocketPort}");
InternalSocketServer.Listen(512);
InternalSocketServer.BeginAccept(new AsyncCallback(AcceptCallback), null);
}
private async void AcceptCallback(IAsyncResult e)
{
if (IsDisposed)
{
return;
}
Socket Socket = InternalSocketServer.EndAccept(e);
InternalSocketServer.BeginAccept(new AsyncCallback(AcceptCallback), null);
byte[] HeaderBuffer = new byte[8192]; // Default Header size
Socket.Receive(HeaderBuffer, HeaderBuffer.Length, 0);
string Header = Encoding.ASCII.GetString(HeaderBuffer);
string HttpVersion = Header.Split(' ')[2].Split('\r')[0]?.Trim();
string TargetURL = Header.Split(' ')[1]?.Trim();
if (string.IsNullOrEmpty(HttpVersion) || string.IsNullOrEmpty(TargetURL))
{
throw new Exception("Unsupported request.");
}
string UriHostname = string.Empty;
int UriPort = 0;
if (TargetURL.Contains(":") && !TargetURL.Contains("http://"))
{
UriHostname = TargetURL.Split(':')[0];
UriPort = int.Parse(TargetURL.Split(':')[1]);
}
else
{
Uri URL = new Uri(TargetURL);
UriHostname = URL.Host;
UriPort = URL.Port;
}
Socket TargetSocket = CreateSocketServer();
SocketError Connection = await TrySocksConnection(UriHostname, UriPort, TargetSocket);
if (Connection != SocketError.Success)
{
if (Connection == SocketError.HostUnreachable || Connection == SocketError.ConnectionRefused || Connection == SocketError.ConnectionReset)
{
Send(Socket, $"{HttpVersion} 502 Bad Gateway\r\n\r\n");
}
else if (Connection == SocketError.AccessDenied)
{
Send(Socket, $"{HttpVersion} 401 Unauthorized\r\n\r\n");
}
else
{
Send(Socket, $"{HttpVersion} 500 Internal Server Error\r\nX-Proxy-Error-Type: {Connection}\r\n\r\n");
}
Dispose(Socket);
Dispose(TargetSocket);
}
else
{
Send(Socket, $"{HttpVersion} 200 Connection established\r\n\r\n");
Relay(Socket, TargetSocket, false);
}
}
