p2ptcpnat原理圖+源碼（原創）

2019-11-14 13:50:10

字體：大中小

來源：轉載

供稿：網友

現今網上p2p的 udp nat穿透文章多如牛毛， p2p tcp nat的文章寥寥無幾，up主研究了幾天終于有所收獲，特來向大家分享，請大家多多支持！

1、首先你要有臺外網服務器或者電信的運營商支持轉發的路由器（具體過程不多說，請自行百度）

2、一臺能上網的電腦（內網里面的電腦不然沒有意義）

核心代碼就是：

socket.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);


作用就是讓已經連接的端口可以再次監聽 從而實現tcp nat 的目的

原理圖：

外網服務器端代碼（ps:up主窮買不起服務器只能用公司的路由器轉發，請見諒！）：

using System;using System.Collections.Generic;using System.Linq;using System.Net;using System.Net.Sockets;using System.Text;using System.Threading;namespace TcpNatTestS{    class PRogram    {        public static ipAddress GetLocalIP()        {            try            {                string HostName = Dns.GetHostName(); //得到主機名                IPHostEntry IpEntry = Dns.GetHostEntry(HostName);                for (int i = 0; i < IpEntry.AddressList.Length; i++)                {                    //從IP地址列表中篩選出IPv4類型的IP地址                    //AddressFamily.InterNetwork表示此IP為IPv4,                    //AddressFamily.InterNetworkV6表示此地址為IPv6類型                    if (IpEntry.AddressList[i].AddressFamily == AddressFamily.InterNetwork)                    {                        return IpEntry.AddressList[i];                    }                }                return IPAddress.Any;            }            catch (Exception ex)            {                return IPAddress.Any;            }        }        static void Main(string[] args)        {            TcpListener tcp = new TcpListener(new IPEndPoint(GetLocalIP(), 8085));            tcp.Start();            new Thread(e =>            {                while (true)                {                    var lianjie = tcp.AcceptTcpClient();                    //new TcpClient().Connect((IPEndPoint)lianjie.Client.RemoteEndPoint);                    lianjie.Client.Send(UnicodeEncoding.Unicode.GetBytes("你的外網ip是：" + lianjie.Client.RemoteEndPoint));                    Console.WriteLine("內網服務器： 本地端口：" + lianjie.Client.LocalEndPoint + "遠程端口：" + lianjie.Client.RemoteEndPoint);                }            }).Start();            Console.ReadKey();        }    }}

內網客戶端(你需要自己填寫外網服務器ip):

using System;using System.Collections.Generic;using System.Linq;using System.Net;using System.Net.Sockets;using System.Text;using System.Threading;namespace TcpNatTestA{    class Program    {        public static IPAddress GetLocalIP()        {            try            {                string HostName = Dns.GetHostName(); //得到主機名                IPHostEntry IpEntry = Dns.GetHostEntry(HostName);                for (int i = 0; i < IpEntry.AddressList.Length; i++)                {                    //從IP地址列表中篩選出IPv4類型的IP地址                    //AddressFamily.InterNetwork表示此IP為IPv4,                    //AddressFamily.InterNetworkV6表示此地址為IPv6類型                    if (IpEntry.AddressList[i].AddressFamily == AddressFamily.InterNetwork)                    {                        return IpEntry.AddressList[i];                    }                }                return IPAddress.Any;            }            catch (Exception ex)            {                return IPAddress.Any;            }        }        static void Main(string[] args)        {            new Thread(e =>            {                TcpClient clinet = new TcpClient();                clinet.Client.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);                var bendi = new IPEndPoint(GetLocalIP(), 7896);                clinet.Client.Bind(bendi);                clinet.Connect(new IPEndPoint(IPAddress.Parse("請填寫你的服務器ip"), 8085));                TcpListener tcp = new TcpListener(bendi);                tcp.Server.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true);                tcp.Start();                new Thread(() =>                {                    while (true)                    {                        var jiqi= tcp.AcceptTcpClient();                        Console.WriteLine("內網客戶機： 本地端點：" + bendi + " 遠程端點：" + jiqi.Client.RemoteEndPoint);                    }                }).Start();                clinet.Client.Send(UnicodeEncoding.Unicode.GetBytes("呵呵呵呵"));                byte[] hh = new byte[500];                var weishu = clinet.Client.Receive(hh);                byte[] temp = new byte[weishu];                Array.Copy(hh, temp, weishu);                //Console.WriteLine("遠程端口："+clinet.Client.RemoteEndPoint);                Console.WriteLine(UnicodeEncoding.Unicode.GetString(temp));            }).Start();            Console.ReadKey();        }    }}