C++实现ping程序实例

  • Z时代
  • 2024-01-10
  • 分类：综合

本文实例讲述了C++实现ping程序的方法。分享给大家供大家参考。具体实现方法如下：

该实例涉及ICMP数据包的发送与回显，PING程序代码如下：

DWORD WINAPI ThreadProc(LPVOID lParam)
{
 CInitSock initSock;
 
 HWND hWnd = (HWND)lParam; //从参数得到句柄
 char szIp[64] ={0}; 
 ::GetDlgItemTextA(hWnd, IDC_IP, szIp, sizeof(szIp)); //从控件得到ip地址
 //1. 创建协议类型为IPPROTO_ICMP的原始套接字，设置套接字属性
 SOCKET sRaw = ::socket(AF_INET, SOCK_RAW, IPPROTO_ICMP);
 SetTimeOut(sRaw, 1000, TRUE);

 //2.创建并初始化ICMP封包

 char buff[sizeof(ICMP_HDR)+32] = {0};

 ICMP_HDR* pIcmp = (ICMP_HDR*)buff;

 pIcmp->icmp_type = 8;

 pIcmp->icmp_code = 0;

 pIcmp->icmp_checksum = 0;

 pIcmp->icmp_id = (USHORT)::GetCurrentProcessId();

 pIcmp->icmp_sequence = 0;

 pIcmp->icmp_timestamp = 0;

 //填充数据

 memset(&buff[sizeof(ICMP_HDR)], 'E', 32);

 //开始发送和接收封包

 USHORT nSeq = 0;

 SOCKADDR_IN dest;

 dest.sin_family = AF_INET;

 dest.sin_port = htons(0);

 dest.sin_addr.S_un.S_addr = inet_addr(szIp); //inet_addr("192.168.19.63"); //inet_addr(szIp);220.181.111.147

 CString strToShow="";

 char* pszRevBuf = new char[1024]; //[1024] = {0};

 memset(pszRevBuf, 0, 1024);

 SOCKADDR_IN from;

 int nFromLen= sizeof(from);

 while (TRUE)

 {

  //3. 调用sendto发送ICMP请求

  static int nCount=0;

  if (nCount++==4)

  {

   break;

  }

  pIcmp->icmp_checksum = checksum((USHORT*)buff, sizeof(ICMP_HDR)+32);

  pIcmp->icmp_sequence = ++nSeq;

  pIcmp->icmp_timestamp = ::GetTickCount();

  int nRet;

  nRet = ::sendto(sRaw, buff, sizeof(ICMP_HDR)+32, 0, (SOCKADDR*)&dest, sizeof(dest));

  if (nRet == SOCKET_ERROR)

  {

   int nError = ::WSAGetLastError();

   strToShow += "sendto error\r\n";

   return -1;

  }

  

  //4. 调用recvfrom接受ICMP响应

  nRet = ::recvfrom(sRaw, pszRevBuf, 1024, 0, (sockaddr*)&from, &nFromLen);

  if (nRet == SOCKET_ERROR)

  {

   if (::WSAGetLastError() == WSAETIMEDOUT)

   {

    strToShow += "timeout\r\n";

    continue;

   }

   strToShow += "recvfrom error\r\n";

   return -1;

  }

  //解析接收到的ICMP包

  int nTick = ::GetTickCount();

  if (nRet < sizeof(ICMP_HDR)+sizeof(IPHeader))

  {

   strToShow += "less byte recved..\r\n";

  }

  ICMP_HDR* pRecvIcmp = (ICMP_HDR*)(pszRevBuf + sizeof(IPHeader));// 跳过IP头

  if (pRecvIcmp->icmp_type != 0)

  {

   strToShow += "不是回显类型";

   return -1;

  }

  if (pRecvIcmp->icmp_id != ::GetCurrentProcessId())

  {

   strToShow += "不是本进程的回显包\r\n";

   return -1;

  }

  CString strTemp;

  strTemp.Format("收到来自于[%s]IP的%04d字节\r\n", inet_ntoa(from.sin_addr), nRet);

  strToShow += strTemp;

  strTemp = "";

  strTemp.Format("序列号:%d\r\n", pRecvIcmp->icmp_sequence);

  strToShow += strTemp;

  strTemp = "";

  strTemp.Format("花费时间:%d\r\n", nTick - pRecvIcmp->icmp_timestamp);

 }

 strToShow += "**********************************";

 ::SetDlgItemTextA(hWnd, IDC_DATA, strToShow);

 return 0;

}

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