最简单的端口转发，反向通道

#pragma comment( lib, "ws2_32.lib" )
#include <windows.h>
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <tchar.h>
#include <stdio.h>
#include <winuser.h>

DWORD WINAPI hrcv(LPVOID);
DWORD WINAPI hsnd(LPVOID);

SOCKET sock,new_fd;
SOCKET sock2,new_fd2;
int APIENTRY _tWinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPTSTR lpCmdLine,
                   int nCmdShow)
{
   struct sockaddr_in server,server2;
   DWORD threadid;
   WSADATA ws;
   struct hostent * iipp;
   WSAStartup( MAKEWORD(2, 2),&ws);
   if ((iipp=gethostbyname("xxxxxx.9966.org"))==0)return 0;//////////////////

   sock = socket(AF_INET, SOCK_STREAM,0);
   server.sin_family = AF_INET;
   server.sin_port = htons(3389);
   server.sin_addr.s_addr = inet_addr ("127.0.0.1");
   if ((connect(sock, (struct sockaddr *)&server, sizeof(server)))==SOCKET_ERROR)
   {   int fff=WSAGetLastError();
   char buffer[50];
   _gcvt(fff, 20, buffer );
//   MessageBox(0,buffer,"aa",0);
   }

   sock2 = socket(AF_INET, SOCK_STREAM,0);
   server2.sin_family = AF_INET;
   server2.sin_port = htons(9900);
   server2.sin_addr= *((struct in_addr *)iipp->h_addr);
   if ((connect(sock2, (struct sockaddr *)&server2, sizeof(server2)))==SOCKET_ERROR)
   {   int fff=WSAGetLastError();
   char buffer[50];
   _gcvt(fff, 20, buffer );
//   MessageBox(0,buffer,"bind错误码",0);
   }

   CreateThread(0,0,hrcv,0,0,&threadid);
   CreateThread(0,0,hsnd,0,0,&threadid);

//////////////////////////////////////////////////////////////////////////////////////以下是服务端

#pragma comment( lib, "ws2_32.lib" )
#include <windows.h>
#include <stdlib.h>
#include <malloc.h>
#include <memory.h>
#include <tchar.h>
#include <stdio.h>
#include <winuser.h>

DWORD WINAPI hrcv(LPVOID);
DWORD WINAPI hsnd(LPVOID);

SOCKET sock,new_fd;
SOCKET sock2,new_fd2;
int APIENTRY _tWinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPTSTR lpCmdLine,
                   int nCmdShow)
{
   struct sockaddr_in server,server2;
   DWORD threadid;
   WSADATA ws;

   WSAStartup( MAKEWORD(2, 2),&ws);

   sock = socket(AF_INET, SOCK_STREAM,0);
   server.sin_family = AF_INET;
   server.sin_port = htons(33896);
   server.sin_addr.s_addr = inet_addr ("0.0.0.0");
   if ((bind(sock, (struct sockaddr *)&server, sizeof(server)))==SOCKET_ERROR)
   {   int fff=WSAGetLastError();
   char buffer[50];
   _gcvt(fff, 20, buffer );
   MessageBox(0,buffer,"bind错误码",0);
   }
   listen(sock,10);


   sock2 = socket(AF_INET, SOCK_STREAM,0);
   server2.sin_family = AF_INET;
   server2.sin_port = htons(9900);
   server2.sin_addr.s_addr = inet_addr ("0.0.0.0");
   if ((bind(sock2, (struct sockaddr *)&server2, sizeof(server2)))==SOCKET_ERROR)
   {   int fff=WSAGetLastError();
   char buffer[50];
   _gcvt(fff, 20, buffer );
   MessageBox(0,buffer,"bind错误码",0);
   }



   listen(sock2,10);

   new_fd = accept(sock,0,0);


   new_fd2 = accept(sock2,0,0);


   CreateThread(0,0,hrcv,0,0,&threadid);
   CreateThread(0,0,hsnd,0,0,&threadid);




   while(1)
   {
       Sleep(1000);
   };

};

DWORD WINAPI hrcv(LPVOID lp)
{
   int iResult;
   char strBuffersss[1024];
   while(1)
   {
       iResult = recv(new_fd,strBuffersss,sizeof(strBuffersss),0);
       if(iResult<=0)ExitProcess(0);
       send(new_fd2,strBuffersss,iResult,0);
   };
};

DWORD WINAPI hsnd(LPVOID lp)
{
   int iResult;
   char strBuffersss[1024];
   while(1)
   {
       iResult = recv(new_fd2,strBuffersss,sizeof(strBuffersss),0);
       if(iResult<=0)ExitProcess(0);
       send(new_fd,strBuffersss,iResult,0);
   };
};

来源：CSDN

作者：pjdsydzxw

链接：https://blog.csdn.net/pjdsydzxw/article/details/104050224

标签

socket

端口转发