话说上一次做完http代理工具后,没有测试QQ代理,回家试了一下,做了一下简单补充,并测试通过。
上次的文章提到,所有公司的服务器端口都封了,只剩下几个通讯的已经正在便用的。
于是,在本地XP下试了一下端口劫持,也称端口复用。抢占80端口。
关键代码就一句:tcplistener.Server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
在本地实现抢占80端口后,所有的http请求本地iis的,就出现访问不了的情况,所以我又实现了给IIS中转请求
即收到消息后,分析是否IIS请求,如果是,则转发请求到IIS,其它的就转发给相应其它的网站。
由于转发给本机的IIS请求速度过快,这时候需要适当延时,不然问题又出来了。
端口复用在win2003下是不支持的,我也没办法。
但是可通过不同IP监听同一端口如:192.168.1.48 8000 和192.168.1.49 8000(此时需要为主机分配多个IP)
接下来继续上代码,并提供代码下载:
Proxy.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Net.Sockets;
using System.Threading;
namespace TcpProxy
{
    /// <summary>
    /// by 路过秋天
    /// http://www.cnblogs.com/cyq1162
    /// </summary>
    class Program
    {
      
        static void Main(string[] args)
        {
                Listen(80);
        }
        static void Write(string msg)
        {
            Console.WriteLine(msg);
        }
        static void Listen(int port)
        {
            Write("准备监听端口:" + port);
            System.Net.IPAddress[] ips = System.Net.Dns.GetHostAddresses(System.Net.Dns.GetHostName());
            foreach (System.Net.IPAddress ip in ips)
            {
                Write(ip.ToString());
            }
            System.Net.IPAddress ipp = System.Net.IPAddress.Parse("0.0.0.0");
            TcpListener tcplistener = new TcpListener(ipp,port);
            //tcplistener.ExclusiveAddressUse = false;
           tcplistener.Server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
           //tcplistener.Server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.,ProtocolType.IP);
            try
            {
                tcplistener.Start();
            }
            catch(Exception err)
            {
                Write(err.Message);
                Write("该端口已被占用,请更换端口号!!!");
                ReListen(tcplistener);
            }
           
            Write("确认:y/n (yes or no):");
            string isOK = Console.ReadLine();
            if (isOK == "y")
            {
                Write("成功监听端口:" + port);
                //侦听端口号 
                Socket socket;
                while (true)
                {
                    socket = tcplistener.AcceptSocket();
                    //并获取传送和接收数据的Scoket实例 
                    Proxy proxy = new Proxy(socket);
                    //Proxy类实例化 
                    Thread thread = new Thread(new ThreadStart(proxy.Run));
                    //创建线程 
                    thread.Start();
                    System.Threading.Thread.Sleep(200);
                    //启动线程 
                }
            }
            else
            {
                ReListen(tcplistener);
            }
        }
        static void ReListen(TcpListener listener)
        {
            if (listener != null)
            {
                listener.Stop();
                listener = null;
            }
            Write("请输入监听端口号:");
            string newPort = Console.ReadLine();
            int port;
            if (int.TryParse(newPort, out port))
            {
                Listen(port);
            }
            else
            {
                ReListen(listener);
            }
        }
    }
}
Program.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Diagnostics;
using System.Net.Sockets;
using System.Threading;
namespace TcpProxy
{
    /// <summary>
    /// by 路过秋天
    /// http://www.cnblogs.com/cyq1162
    /// </summary>
    class Program
    {
      
        static void Main(string[] args)
        {
                Listen(80);
        }
        static void Write(string msg)
        {
            Console.WriteLine(msg);
        }
        static void Listen(int port)
        {
            Write("准备监听端口:" + port);
            System.Net.IPAddress[] ips = System.Net.Dns.GetHostAddresses(System.Net.Dns.GetHostName());
            foreach (System.Net.IPAddress ip in ips)
            {
                Write(ip.ToString());
            }
            System.Net.IPAddress ipp = System.Net.IPAddress.Parse("0.0.0.0");
            TcpListener tcplistener = new TcpListener(ipp,port);
            //tcplistener.ExclusiveAddressUse = false;
           tcplistener.Server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);
           //tcplistener.Server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.,ProtocolType.IP);
            try
            {
                tcplistener.Start();
            }
            catch(Exception err)
            {
                Write(err.Message);
                Write("该端口已被占用,请更换端口号!!!");
                ReListen(tcplistener);
            }
           
            Write("确认:y/n (yes or no):");
            string isOK = Console.ReadLine();
            if (isOK == "y")
            {
                Write("成功监听端口:" + port);
                //侦听端口号 
                Socket socket;
                while (true)
                {
                    socket = tcplistener.AcceptSocket();
                    //并获取传送和接收数据的Scoket实例 
                    Proxy proxy = new Proxy(socket);
                    //Proxy类实例化 
                    Thread thread = new Thread(new ThreadStart(proxy.Run));
                    //创建线程 
                    thread.Start();
                    System.Threading.Thread.Sleep(200);
                    //启动线程 
                }
            }
            else
            {
                ReListen(tcplistener);
            }
        }
        static void ReListen(TcpListener listener)
        {
            if (listener != null)
            {
                listener.Stop();
                listener = null;
            }
            Write("请输入监听端口号:");
            string newPort = Console.ReadLine();
            int port;
            if (int.TryParse(newPort, out port))
            {
                Listen(port);
            }
            else
            {
                ReListen(listener);
            }
        }
    }
}
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