下面代码是关于C#开发的简单端口转发程序的代码。
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using System;
using System.Collections.Generic;
using System.Net;
using System.Net.Sockets;
using System.Text;
using System.Threading;
namespace portmap_net
{
sealed internal class state
{
#region Fields (5)
public int _connect_cnt;
public string _point_in;
public string _point_out;
public const string _print_head = "输入IP 输出IP 状态 连接数 接收/发送";
public bool _running;
public long _bytes_send;
public long _bytes_recv;
#endregion Fields
#region Constructors (1)
public state(string point_in, string point_out, bool running, int connect_cnt, int bytes_send, int bytes_recv)
{
_point_in = point_in;
_point_out = point_out;
_running = running;
_connect_cnt = connect_cnt;
_bytes_recv = bytes_recv;
_bytes_send = bytes_send;
}
#endregion Constructors
#region Methods (1)
public override string ToString()
{
return string.Format("{0}{1}{2}{3}{4}", _point_in.PadRight(20, ' '), _point_out.PadRight(20, ' '), (_running ? "运行中 " : "启动失败"), _connect_cnt.ToString().PadRight(10, ' '), Math.Round((double)_bytes_recv / 1024) + "k/" + Math.Round((double)_bytes_send / 1024) + "k");
}
#endregion Methods
}
internal struct work_item
{
#region Data Members (4)
public int _id;
public EndPoint _ip_in;
public string _ip_out_host;
public ushort _ip_out_port;
#endregion Data Members
}
sealed internal class program
{
#region Fields (4)
private static StringBuilder _console_buf = new StringBuilder();
private static readonly Dictionary _state_dic = new Dictionary();
#endregion Fields
#region Methods (8)
private static void Main()
{
List maps_list = new List{
new work_item{_id = 1, _ip_in = new IPEndPoint(IPAddress.Any,2012), _ip_out_host="10.10.1.18", _ip_out_port = 3389 },
new work_item{_id = 2, _ip_in = new IPEndPoint(IPAddress.Any,2013), _ip_out_host="www.beta-1.cn", _ip_out_port = 80 }
};
foreach (var map_item in maps_list)
map_start(map_item);
Console.CursorVisible = false;
while (true)
{
show_state();
Thread.Sleep(2000);
}
}
private static void map_start(work_item work)
{
Socket sock_svr = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
bool start_error = false;
try
{
sock_svr.Listen(10);
}
catch (Exception)
{
start_error = true;
}
finally
{
_state_dic.Add(work._id, new state(work._ip_in.ToString(), work._ip_out_host + ":" + work._ip_out_port, !start_error, 0, 0, 0));
}
}
private static void on_local_connected(IAsyncResult ar)
{
object[] ar_arr = ar.AsyncState as object[];
Socket sock_svr = ar_arr[0] as Socket;
work_item work = (work_item)ar_arr[1];
++_state_dic[work._id]._connect_cnt;
Socket sock_cli = sock_svr.EndAccept(ar);
sock_svr.BeginAccept(on_local_connected, ar.AsyncState);
Socket sock_cli_remote = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
try
{
sock_cli_remote.Connect(work._ip_out_host, work._ip_out_port);
}
catch (Exception)
{
try
{
sock_cli.Shutdown(SocketShutdown.Both);
sock_cli_remote.Shutdown(SocketShutdown.Both);
sock_cli.Close();
sock_cli_remote.Close();
}
catch (Exception)
{ }
--_state_dic[work._id]._connect_cnt;
return;
}
Thread t_send = new Thread(recv_and_send_caller) { IsBackground = true };
Thread t_recv = new Thread(recv_and_send_caller) { IsBackground = true };
t_send.Start(new object[] { sock_cli, sock_cli_remote, work._id, true });
t_recv.Start(new object[] { sock_cli_remote, sock_cli, work._id, false });
t_send.Join();
t_recv.Join();
--_state_dic[work._id]._connect_cnt;
}
private static void recv_and_send(Socket from_sock, Socket to_sock, Action send_complete)
{
byte[] recv_buf = new byte[4096];
int recv_len;
while ((recv_len = from_sock.Receive(recv_buf)) > 0)
{
to_sock.Send(recv_buf, 0, recv_len, SocketFlags.None);
send_complete(recv_len);
}
}
private static void recv_and_send_caller(object thread_param)
{
object[] param_arr = thread_param as object[];
Socket sock1 = param_arr[0] as Socket;
Socket sock2 = param_arr[1] as Socket;
try
{
recv_and_send(sock1, sock2, bytes =>
{
state stat = _state_dic[(int)param_arr[2]];
if ((bool)param_arr[3])
stat._bytes_send += bytes;
else
stat._bytes_recv += bytes;
});
}
catch (Exception)
{
try
{
sock1.Shutdown(SocketShutdown.Both);
sock2.Shutdown(SocketShutdown.Both);
sock1.Close();
sock2.Close();
}
catch (Exception) { }
}
}
private static void show_state()
{
StringBuilder curr_buf = new StringBuilder();
curr_buf.AppendLine(program_ver);
curr_buf.AppendLine(state._print_head);
foreach (KeyValuePair item in _state_dic)
curr_buf.AppendLine(item.Value.ToString());
if (_console_buf.Equals(curr_buf))
return;
Console.Clear();
Console.WriteLine(curr_buf);
_console_buf = curr_buf;
}
#endregion Methods
--------------------------------------------------";
}
} 
