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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, '

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