关于SOCKS5通信的客户端问题

[weixin_42298060]

我的编译环境是win10+visual studio 2015
客户端是用C#写的控制台程序
我调试的时候是在本机上架设了一个代理服务器，所以代理端地址是192.168.0.109:1002
先上代码

/* ***********************************************
 * Author       :  CYhyq
 * Email        :  [e-mail]
 * DateTime     :  2018-08-21 15:41:52
 * Description  :  核心代码 的摘要说明
 *
 * ***********************************************/
using System;
using System.Text;
using System.Net.Sockets;
using System.Net;

namespace Socks5.proxy
{
    class Program
    {
        static void Main(string[] args)
        {
            Proxy proxy = new Proxy();
            proxy.SendFirstMessage();
            Console.WriteLine("如果要停止服务,请按回车键!!");
            Console.ReadLine();
        }
        public class Proxy
        {
            static string proxyIP = "192.168.0.109";
            static int proxyPort = 1002;
            IPEndPoint proxyEndPoint = new IPEndPoint(IPAddress.Parse(proxyIP), proxyPort);         //代理IP
            Socket s = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            Socket receiveSocket = new Socket(AddressFamily.InterNetwork,SocketType.Stream,ProtocolType.Tcp);
            byte[] request  = new byte[1000];                //请求信息
            byte[] sreceive = new byte[10000];              //返回消息
            string userName = "xxxx";                       //账户
            string password = "xxxx";                       //密码
            byte[] rawBytes = new byte[1024];               //转换容器
            int nIndex      = 0;                            //下标
            string destAddress = "52.235.21.1";             //目的地网址
            static int dest_port = 13307;                   //目的端口
            static byte[] result = new byte[1024];          //结果集
            static int port;                                //转换的端口
            StringBuilder sb = new StringBuilder();       //接收数据的结果
            static string Result;                          //结果--字符串
            public void SendFirstMessage()
            {
                // open a TCP connection to SOCKS server...
                s.Connect(proxyEndPoint);
                //第一次发送信息
                nIndex = 0;
                request[nIndex++] = 0x05; // Version 5.
                request[nIndex++] = 0x01; // METHOD.
                request[nIndex++] = 0x02; // USERNAME/PASSWORD
                s.Send(request, 3, SocketFlags.None);
                int a = s.Receive(sreceive, sreceive.Length, SocketFlags.None);
                //Username / Password Authentication protocol

                //第二次发送验证消息
                byte[] request1 = new byte[userName.Length+ password.Length+3];
                nIndex = 0;
                request1[nIndex++] = 0x01; // Version 5.
                // add user name Length
                request1[nIndex++] = (byte)userName.Length;      
                rawBytes = Encoding.Default.GetBytes(userName);
                // 账户本身
                rawBytes.CopyTo(request1, nIndex);
                nIndex += (ushort)rawBytes.Length;
                // add password Length
                request1[nIndex++] = (byte)password.Length;
                rawBytes = Encoding.Default.GetBytes(password);
                // 密码本身
                rawBytes.CopyTo(request1, nIndex);
                nIndex += (ushort)rawBytes.Length;
                // Send the Username/Password request
                s.Send(request1, request1.Length, SocketFlags.None);
                a = s.Receive(sreceive, sreceive.Length, SocketFlags.None);
                if (sreceive[1] !=0)
                {
                    Console.WriteLine("代理服务器验证失败。");
                }
                else
                {
                    Console.WriteLine("代理服务器验证成功。");
                    //继续发送请求
                    // Send connect request now...
                    nIndex = 0;

                    string [] IP_Array= destAddress.Split('.');
                    request[nIndex++] = 0x05;   // version 5.
                    request[nIndex++] = 0x01;   // 1 = connect. 2 = bind . 3 = UDP
                    request[nIndex++] = 0x00;   // Reserve = must be 0x00 此功能为保留功能
                    //request[nIndex++] = 0x04; // ATYP=IPV6
                    request[nIndex++] = 0x01;   // ATYP=IPV4

                    //服务器IP*
                    request[nIndex++] = Convert.ToByte(IP_Array[0]);   //连接目的地址（服务器）
                    request[nIndex++] = Convert.ToByte(IP_Array[1]);
                    request[nIndex++] = Convert.ToByte(IP_Array[2]);
                    request[nIndex++] = Convert.ToByte(IP_Array[3]);
                    //byte转化为int

                    //服务器端口dest_port
                    int port = Convert.ToInt32(dest_port);
                    string hexOutput = String.Format("{0:X}", port);
                    //Console.WriteLine("Hexadecimal value of {0} is {1}", port, hexOutput);
                    request[nIndex++] = (byte)(dest_port / 256);
                    request[nIndex++] = (byte)(dest_port % 256);
                    s.Send(request, nIndex, SocketFlags.None);

                    a = s.Receive(sreceive, sreceive.Length, SocketFlags.None);
                    Console.WriteLine("返回消息以下:");
                    Console.WriteLine("a   =" + a);                        //返回信息的长度
                    Console.WriteLine("VER =" + sreceive[0]);
                    Console.WriteLine("REP =" + sreceive[1]);
                    Console.WriteLine("RSV =" + sreceive[2]);
                    Console.WriteLine("ATYP=" + sreceive[3]);
                    Console.WriteLine("返回信息IP=" + sreceive[4]);
                    Console.WriteLine("返回信息IP=" + sreceive[5]);
                    Console.WriteLine("返回信息IP=" + sreceive[6]);
                    Console.WriteLine("返回信息IP=" + sreceive[7]);
                    Console.WriteLine("端口信息1=" + sreceive[8]);
                    Console.WriteLine("端口信息2=" + sreceive[9]);
                    Console.WriteLine("");
                    if (sreceive[1]==0)
                    {
                       try
                        {
                            //发送让代理服务器转发的消息
                            string message = "{'head':'login','name':'2535','mm':'123'}";
                            s.Send(Encoding.Default.GetBytes(message));
                            //接收代理服务器返回的消息
                            while ((a = s.Receive(result)) > 0)
                            {
                                sb.Append(Encoding.Default.GetString(result, 0, a));
                            }
                        }
                        catch
                        {
                            //通信过程出问题，异常关闭socket
                            s.Close();
                        }
                        Result = sb.ToString();
                        Console.WriteLine("Result="+ Result);
                        //信息收发完关闭与代理服务器连接
                        s.Close();
                        Console.WriteLine("代理服务结束");
                    }

                }
            }
        }
    }
}

目的IP（destAddress ）和端口 是我后台服务器所在的IP和端口，向后台发送消息后收到的消息无论如何都不该是空，因为后台是会判断消息后返回不会空的消息，但是实际运行后的结果是这样：

Result最后的返回结果应该就是代理服务器访问了destAddress 以后返回回来的信息吧，但是最后结果是空，希望大神能够给个建议，研究了很久没发现是哪里的问题，小弟在此谢过。

[lsgzs2018]

使用驱动拦截网络数据，然后R3用SOCKS5转发到你的代理服务器。
可以达到每个进程不同IP的效果，上个图吧。