/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * 
* the Author: CYhyq 
* E-mail: 421160052 @qq.com 
* a DateTime: the 2018-08-21 15:41:52 
* Description: summary of the core code Description 
* 
* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
using System; 
using System.Text; 
Using System.Net.Sockets; 
Using System.Net; 

The namespace Socks5. Proxy 
{
Class Program 
{
The static void Main (string [] args) 
{
The Proxy Proxy=new Proxy (); 
Proxy. SendFirstMessage (); 
Console. WriteLine (" if you want to stop the service, please press the return key!! "); 
Console.ReadLine(); 
} 
Public class Proxy 
{
The static string proxyIP="192.168.0.109"; 
Static int proxyPort=1002; 
IPEndPoint proxyEndPoint=new IPEndPoint (IPAddress. Parse (proxyIP), proxyPort);//proxy 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].//request information 
Byte [] sreceive=new byte [10000].//return message 
String userName="XXXX";//account 
String password="XXXX";//password 
Byte [] rawBytes=new byte [1024].//conversion container 
Int nIndex=0;//the subscript 
String destAddress="52.235.21.1";//destination url 
Static int dest_port=13307;//destination port 
The static byte [] result=new byte [1024].//the result set 
Static int port;//conversion of port 
StringBuilder sb=new StringBuilder();//the result of the receiving data 
The static string Result;//the result - string 
Public void SendFirstMessage () 
{
//open a TCP connection to the SOCKS server... 
S.C onnect (proxyEndPoint); 
//for the first time send information 
NIndex=0; 
Request [nIndex++]=0 x05;//Version 5. 
Request [nIndex++]=0 x01;//METHOD. 
Request [nIndex++]=0 x02;//USERNAME/PASSWORD 
S.S end (request, 3, SocketFlags. None). 
Int a=s.R eceive (sreceive, sreceive. Length, SocketFlags. None). 
//Username/Password Authentication protocol 

//the second send validation message 
Byte [] request1=new byte [userName + password Length. The Length + 3); 
NIndex=0; 
Request1 [nIndex++]=0 x01;//Version 5. 
//add user name Length 
Request1 [nIndex++]=(byte) userName. Length; 
RawBytes=Encoding. The Default. GetBytes (userName); 
//account itself 
RawBytes. CopyTo (request1 nIndex); 
NIndex +=(ushort) rawBytes. Length; 
//add the password Length 
Request1 [nIndex++]=(byte) password. Length; 
RawBytes=Encoding. The Default. GetBytes (password); 
//the password itself 
RawBytes. CopyTo (request1 nIndex); 
NIndex +=(ushort) rawBytes. Length; 
//Send the Username/Password request 
S.S end (request1, request1. Length, SocketFlags. None). 
A=s.R eceive (sreceive, sreceive. Length, SocketFlags. None). 
If (sreceive [1].=0) 
{
Console. WriteLine (" proxy server validation fails, "); 
} 
The else 
{
Console. WriteLine (" proxy authentication is successful, "); 
//continue to send the request 
//Send the connect request now... 
NIndex=0; 

String [] IP_Array=destAddress. Split ('. '); 
Request [nIndex++]=0 x05;//version 5. 
Request [nIndex++]=0 x01;//1=connect. 2=bind. 3=UDP 
Request [nIndex++]=0 x00;//Reserve=must be 0 x00 the function to retain 
//request/nIndex++=0 x04;//ATYP=IPV6 
Request [nIndex++]=0 x01;//ATYP=IPV4 

//server IP * 
Request [nIndex++]=the Convert. ToByte (IP_Array [0]).//connect the destination address (server) 
Request [nIndex++]=the Convert. ToByte (IP_Array [1]). 
Request [nIndex++]=the Convert. ToByte (IP_Array [2]). 
Request [nIndex++]=the Convert. ToByte (IP_Array [3]). 
//byte into int 

//server port dest_port 
Int port=the Convert. ToInt32 (dest_port); 
String hexOutput=the string. Format ("} {0: X ", the port). 
//the Console. WriteLine (" the Hexadecimal value of {0} is {1} ", port, hexOutput); 
Request [nIndex++]=(byte) (dest_port/256); 
Request [nIndex++]=(byte) (dest_port % 256); 
S.S end (request, nIndex SocketFlags. None). 

A=s.R eceive (sreceive, sreceive. Length, SocketFlags. None). 
Console. WriteLine (" return messages below: "); 
Console. WriteLine (" a="+ a);//returns the length of the information 
Console. WriteLine (" VER="+ sreceive [0]). 
Console. WriteLine (" REP="+ sreceive [1]). 
Console. WriteLine (" RSV="+ sreceive [2]). 
Console. WriteLine (" ATYP="+ sreceive [3]). 
Console. WriteLine (" return information IP="+ sreceive [4]); 
Console. WriteLine (" return information IP="+ sreceive [5]); 
Console. WriteLine (" return information IP="+ sreceive [6]); 
Console. WriteLine (" return information IP="+ sreceive [7]); 
Console. WriteLine (" port information 1="+ sreceive [8]). 
Console. WriteLine (" port information 2="+ sreceive [9]); 
Console. WriteLine (" "); 
If (sreceive [1]==0) 
{
Try 
{
Let the proxy server forwarding messages sent//
String message="{' head ':' login ', 'name', '2535', 'mm' : '123'}"; 
S.S end (Encoding. The Default. GetBytes (the message)); 
//receive the proxy server returned message 
While ((a=s.R eceive (result)) & gt; 0) 
{
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