int iRet,
ret=-1,//select 返回值
iLeft,
idx,
iSTCBCS=0;//STCBCS=SendToClientBuffCurrentSize
char szRecvFromTargetBuff[BuffSize]=,
szSendToClientBuff[BuffSize]=;
fd_set fdread,fdwrite;
while(1)
{
FD_ZERO(&fdread);
FD_ZERO(&fdwrite);
FD_SET(sock[0],&fdwrite);
FD_SET(sock[1],&fdread);
if((ret=select(0,&fdread,&fdwrite,NULL,NULL))==SOCKET_ERROR)
{
printf("\nselect() failed:%d",GetLastError());
break;
}
if(ret>0)
{
//sTarget可读，从target接收数据
if(FD_ISSET(sock[1],&fdread))
{
//接收target返回数据
iRet=recv(sock[1],szRecvFromTargetBuff,BuffSize,0);
if(iRet==SOCKET_ERROR)
{
printf("\nrecv() from target failed:%d",GetLastError());
break;
}
else if(iRet==0)
break;
printf("\nrecv %d bytes from target",iRet);
//把从target接收到的数据添加到发送到client的缓冲区
memcpy(szSendToClientBuff+iSTCBCS,szRecvFromTargetBuff,iRet);
//清空接收target返回数据缓冲区
memset(szRecvFromTargetBuff,0,BuffSize);
//刷新发送到client的数据缓冲区当前大小
iSTCBCS+=iRet;
}
//client可写，发送target返回数据到client
if(FD_ISSET(sock[0],&fdwrite))
{
//发送target返回数据到client
iLeft=iSTCBCS;
idx=0;
while(iLeft>0)
{
iRet=send(sock[0],&szSendToClientBuff[idx],iLeft,0);
if(iRet==SOCKET_ERROR)
{
printf("\nsend() to Client failed:%d",GetLastError());
break;
}
printf("\nsend %d bytes to Client",iRet);
iLeft-=iRet;
idx+=iRet;
}
//清空缓冲区
memset(szSendToClientBuff,0,BuffSize);
iSTCBCS=0;
}
}//end of select ret
Sleep(1);
}//end of while
return 0;
}
利用TCP socket转发和反弹TCP端口进入有防火墙保护的内网
事实上很多内网没有第一部分所说的那么简单啦，我们来看一个有防火墙保护的内网,前提是这个防火墙对反弹TCP端口不做限制，限制了的话，又另当别论了。假 上一页 [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] 下一页 |
