解析ICMP的ping命令代码(1)(2)
- ==================ping的实现部分==================
- int doit(int argc, char* argv[])
- {//[bugfree] 建议将这个argc和argv的处理拿到main函数中
- // 检查命令行参数
- if (argc < 2) {
- cerr << "usage: ping <host>" << endl;
- return 1;
- }
- // 装载ICMP.DLL连接库
- HINSTANCE hIcmp = LoadLibrary("ICMP.DLL");
- if (hIcmp == 0) {
- cerr << "Unable to locate ICMP.DLL!" << endl;
- return 2;
- }
- // 查找给定机器的IP地址信息
- struct hostent* phe;
- if ((phe = gethostbyname(argv[1])) == 0) {
- cerr << "Could not find IP address for " << argv[1] << endl;
- return 3;
- }
- // 定义函数三个指针类型
- typedef HANDLE (WINAPI* pfnHV)(VOID);
- typedef BOOL (WINAPI* pfnBH)(HANDLE);
- typedef DWORD (WINAPI* pfnDHDPWPipPDD)(HANDLE, DWORD, LPVOID, WORD,
- PIP_OPTION_INFORMATION, LPVOID, DWORD, DWORD); // evil, no?
- //定义三个指针函数
- pfnHV pIcmpCreateFile;
- pfnBH pIcmpCloseHandle;
- pfnDHDPWPipPDD pIcmpSendEcho;
- //从ICMP.DLL中得到函数入口地址
- pIcmpCreateFile = (pfnHV)GetProcAddress(hIcmp, "IcmpCreateFile");
- pIcmpCloseHandle = (pfnBH)GetProcAddress(hIcmp, "IcmpCloseHandle");
- pIcmpSendEcho = (pfnDHDPWPipPDD)GetProcAddress(hIcmp, "IcmpSendEcho");
- if ((pIcmpCreateFile == 0) || (pIcmpCloseHandle == 0) ||
- (pIcmpSendEcho == 0)) {
- cerr << "Failed to get proc addr for function." << endl;
- return 4;
- }
- // 打开ping服务
- HANDLE hIP = pIcmpCreateFile();
- if (hIP == INVALID_HANDLE_VALUE) {
- cerr << "Unable to open ping service." << endl;
- return 5;
- }
- // 构造ping数据包
- char acPingBuffer[64];
- memset(acPingBuffer, '\xAA', sizeof(acPingBuffer));
- PIP_ECHO_REPLY pIpe = (PIP_ECHO_REPLY)GlobalAlloc( GMEM_FIXED | GMEM_ZEROINIT,
- sizeof(IP_ECHO_REPLY) sizeof(acPingBuffer));
- if (pIpe == 0) {
- cerr << "Failed to allocate global ping packet buffer." << endl;
- return 6;
- }
- pIpe->Data = acPingBuffer;
- pIpe->DataSize = sizeof(acPingBuffer);
- // 发送ping数据包
- DWORD dwStatus = pIcmpSendEcho(hIP, *((DWORD*)phe->h_addr_list[0]),
- acPingBuffer, sizeof(acPingBuffer), NULL, pIpe,
- sizeof(IP_ECHO_REPLY) sizeof(acPingBuffer), 5000);
- if (dwStatus != 0) {
- cout << "Addr: " <<
- int(LOBYTE(LOWORD(pIpe->Address))) << "." <<
- int(HIBYTE(LOWORD(pIpe->Address))) << "." <<
- int(LOBYTE(HIWORD(pIpe->Address))) << "." <<
- int(HIBYTE(HIWORD(pIpe->Address))) << ", " <<
- "RTT: " << int(pIpe->RoundTripTime) << "ms, " <<
- "TTL: " << int(pIpe->Options.Ttl) << endl;
- }
- else {
- cerr << "Error obtaining info from ping packet." << endl;
- }
- // 关闭,回收资源
- GlobalFree(pIpe);
- FreeLibrary(hIcmp);
- return 0;
- }
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