一种新的穿透防火墙的数据传输技术

    }

    //Change there value...
    RecvAddr.sin_family = AF_INET;
    RecvAddr.sin_port = htons(5555);
    RecvAddr.sin_addr.s_addr = inet_addr("127.0.0.1");

    if(SOCKET_ERROR == sendto(sock,
            "test",
            5,
            0,
            (SOCKADDR *) &RecvAddr,
            sizeof(RecvAddr)))
    {
        printf("sendto wrong:%d\n", WSAGetLastError());
    }
    else
    {
        printf("send ok... Have fun, right? ^_^\n");
    }
    
    getchar();

    //WSACleanup();
    return;
}



很早以前我就有这个想法了,只是一直没有去实现.在上面的代码中,
因为要找出DNS进程句柄,而svchost.exe又有多个,所以以用户名来进行判断,本来是用OpenProcessToken,
但是怎么也不行,所以换个方法.用到了wtsapi32库函数.

再用下面的代码测试:


/*++
UdpReceiver
--*/
#include <stdio.h>
#include "winsock2.h"

#pragma comment(lib, "ws2_32")

void main()
{
  WSADATA wsaData;
  SOCKET RecvSocket;
  sockaddr_in RecvAddr;
  int Port = 5555;
  char RecvBuf[1024];
  int  BufLen = 1024;
  sockaddr_in SenderAddr;
  int SenderAddrSize = sizeof(SenderAddr);

  //-----------------------------------------------
  // Initialize Winsock
  WSAStartup(MAKEWORD(2,2), &wsaData);

  //-----------------------------------------------
  // Create a receiver socket to receive datagrams
  RecvSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);

  //-----------------------------------------------
  // Bind the socket to any address and the specified port.
  RecvAddr.sin_family = AF_INET;
  RecvAddr.sin_port = htons(Port);
  RecvAddr.sin_addr.s_addr = htonl(INADDR_ANY);

  bind(RecvSocket, (SOCKADDR *) &RecvAddr, sizeof(RecvAddr));

  //-----------------------------------------------
  // Call the recvfrom function to receive datagrams
  // on the bound socket.
  printf("Receiving datagrams...\n");
  while(1)
  {
    recvfrom(RecvSocket,
        RecvBuf,

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TAG标签:	技术 防火墙 if NULL return printf // the buf 进程