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透析ICMP协议(三): 牛刀初试之一 应用篇ping(ICMP.dll) =============================== 这篇文章出自:http://tangentsoft.net/wskfaq/examples/dllping.html 翻译: bugfree/CSDN, 对原始代码加了些注释 平台: VC6 Windows XP 原理简介: -------- 这个例子演示了应用微软的ICMP.DLL怎样"ping"另一台机器. 这个DLL是没有文档话的发送ICMP回送包API接口, 也称为"pings," 就像潜水员对声纳信号的术语一样. 这段代码出自一个被一个名叫MarkG的家伙的GUI程序, 他的网页已经消失了. ICMP.DLL API 现在在Windows平台上与微软的Winsocks工作的很好, 但是微软说更好的产品一出来他们将替换它. 微软说这个自从Windows 95时代就在用, 这些功能在在Windows 2000上仍然存在. For more information on the ICMP.DLL API, check out sockets.com's ICMP API page. 更详细的ICMP.DLL API的信息到sockets.com的ICMP API网页获取. 具体实现: -------- // Borland C++ 5.0: bcc32.cpp ping.cpp // Visual C++ 5.0: cl ping.cpp wsock32.lib // // This sample program is hereby placed in the public domain. #include <iostream.h> #include <winsock.h> #include <windowsx.h> #include "icmpdefs.h" ==================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; } ==================主函数================== int main(int argc, char* argv[]) { WSAData wsaData; if (WSAStartup(MAKEWORD(1, 1), &wsaData) != 0) { return 255; } int retval = doit(argc, argv); WSACleanup(); return retval; } ==================头文件================== icmpdefs.h //ICMP.DLL 函数中需要的结构 typedef struct { unsigned char Ttl; // Time To Live unsigned char Tos; // Type Of Service unsigned char Flags; // IP header flags unsigned char OptionsSize; // Size in bytes of options data unsigned char *OptionsData; // Pointer to options data } IP_OPTION_INFORMATION, * PIP_OPTION_INFORMATION; typedef struct { DWORD Address; // Replying address unsigned long Status; // Reply status unsigned long RoundTripTime; // RTT in milliseconds unsigned short DataSize; // Echo data size unsigned short Reserved; // Reserved for system use void *Data; // Pointer to the echo data IP_OPTION_INFORMATION Options; // Reply options } IP_ECHO_REPLY, * PIP_ECHO_REPLY; | 