用UPnP穿透内网

参考了网上的一篇文章，由于时间长了，具体地址不知道了。

引入了一个DLL: Interop.NATUPNPLib.dll，实现穿透局域网，进行Socket通信。

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Net;using System.Net.Sockets;using NATUPNPLib;using System.Threading;using System.Text.RegularExpressions;using System.IO;namespace _22UPnP穿透内网{    class Program    {        static void Main(string[] args)        {            //获取Host Name            string serverName = Dns.GetHostName();            Console.WriteLine("Server名称：" + serverName);            //从当前Host Name解析IP地址，筛选IPv4地址是本机的内网IP地址。            IPAddress internalIP = Dns.GetHostEntry(serverName).AddressList                .Where(i => i.AddressFamily == AddressFamily.InterNetwork)                .FirstOrDefault();            Console.WriteLine("Server内网IP：" + internalIP);            UPnPNAT upnp = new UPnPNAT();            IStaticPortMappingCollection staticPortMappingCollection = upnp.StaticPortMappingCollection;            if (staticPortMappingCollection == null)             {                Console.WriteLine("没有检测到路由器，或者路由器不支持UPnP功能。");                return;            }            int internalPort = 3898;//Server的端口号            int externalPort = 4343;//对应映射的外部端口号            staticPortMappingCollection.Add(                externalPort,//外网端口                "TCP",//协议类型                internalPort,//内网端口                internalIP.ToString(),//内网IP地址                true,//是否开启                "UPNP_Test"//描述                );            Socket serverSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            EndPoint serverEndPoint = new IPEndPoint(internalIP, internalPort);            serverSocket.Bind(serverEndPoint);            serverSocket.Listen(1);            Console.WriteLine("开启服务端监听......\n");            Thread serverThread = new Thread(() => {                Socket socket = null;                while (true)                 {                    if (socket!= null || (socket = serverSocket.Accept()) != null)                    {                        byte[] byteRec = new byte[1024*1024];//设置消息接收缓存区                        int msgLen = socket.Receive(byteRec);                        string msgRec = Encoding.UTF8.GetString(byteRec,0,msgLen);                        Console.WriteLine("来自Client的消息：\n{0}", msgRec);                    }                }            });            serverThread.IsBackground = true;            serverThread.Start();            //外网IP变量            string externalIP;            //正则            var regex = @"\b\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\b";            Console.WriteLine("开始获取外网IP......");            using (var webclient = new WebClient())            {                var rawRes = webclient.DownloadString("http://checkip.dyndns.org/");                externalIP = Regex.Match(rawRes, regex).Value;            }                        Console.WriteLine("获取外网IP成功：" + externalIP);            Thread clientThread = new Thread(() =>            {                ClientConnectToServer(IPAddress.Parse(externalIP), externalPort);            });            clientThread.Start();                        Console.ReadKey();        }        static void ClientConnectToServer(IPAddress remoteIP, int remotePort)         {            Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);            clientSocket.Connect(new IPEndPoint(remoteIP, remotePort));            IPEndPoint remoteEndPoint = clientSocket.RemoteEndPoint as IPEndPoint;            for (int i = 0; i < 3; i++)             {                string msgFromClient = string.Format("Hello, this msg is from Client. \n{2}\n[Remote IP: {0}, Remote Port: {1} ]\n",                    remoteEndPoint.Address, remoteEndPoint.Port, DateTime.Now                );                byte[] bytes = Encoding.UTF8.GetBytes(msgFromClient);                //客户端向服务端发送消息                clientSocket.Send(bytes);                Thread.Sleep(1000);            }        }    }}

附：源码下载地址： http://download.csdn.net/detail/frombegintoend/5688855

附有Interop.NATUPNPLib.dll