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using System;
using System.Net.Sockets;
using System.Threading;
namespace PortTransponder
{
  class Program
  {
    static void Main(string[] args)
    {
      TcpListener tl = new TcpListener(80);
//?aà??a??·??éò?±???á??ó2￠?ò?′±???ó?μ????ú
      tl.Start();
      while (true)
//?aà?±?D?ó??-?·￡??éò??óê?2??1ò????í?§
//òò?a?ò·￠??????·t??óDê±ò??????ú2?DD?í??ò??????ú??á?
      {
//????μ?òa???íê?ò?μ?3ìDòê?μ???·￠?íμ?êy?Y°üoóá￠?ì?a2????3ì×??D×a
        try
        {
          TcpClient tc1 = tl.AcceptTcpClient();
//?aà?ê?μè′yêy?Y?ù?′DD??±?￡?2??á100%??ó?cpu
          TcpClient tc2 = new TcpClient("localhost", 3389);
          tc1.SendTimeout = 300000;
//éè?¨3?ê±￡?·??ò???ú??ò??±±???ó?￡??′ê1ê§è￥á??ó
          tc1.ReceiveTimeout = 300000;
          tc2.SendTimeout = 300000;
          tc2.ReceiveTimeout = 300000;
          object obj1 = (object)(new TcpClient[] { tc1, tc2 });
          object obj2 = (object)(new TcpClient[] { tc2, tc1 });
          ThreadPool.QueueUserWorkItem(new WaitCallback(transfer), obj1);
          ThreadPool.QueueUserWorkItem(new WaitCallback(transfer), obj2);
        }
        catch { }
      }
    }
    public static void transfer(object obj)
    {
      TcpClient tc1 = ((TcpClient[])obj)[0];
      TcpClient tc2 = ((TcpClient[])obj)[1];
      NetworkStream ns1 = tc1.GetStream();
      NetworkStream ns2 = tc2.GetStream();
      while (true)
      {
        try
        {
//?aà?±?D?try catch￡?·??òá??óò?μ??D??3ìDò?í±àà￡á?
//òaê?μˉ3?′í?óìáê?è??ú?÷?′?????í??á?
          byte[] bt = new byte[10240];
          int count = ns1.Read(bt, 0, bt.Length);
          ns2.Write(bt, 0, count);
        }
        catch
        {
          ns1.Dispose();
          ns2.Dispose();
          tc1.Close();
          tc2.Close();
          break;
        }
      }
    }
  }
}