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发表于:2005-10-19 09:24　　标题：透析ICMP协议之应用篇ping
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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.

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
#include
#include
#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 "
// 查找给定机器的IP地址信息
struct hostent* phe;
if ((phe = gethostbyname(argv[1])) == 0) {
      cerr
// 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
// 打开ping服务
HANDLE hIP = pIcmpCreateFile();
if (hIP == INVALID_HANDLE_VALUE) {
      cerr 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 Address))) Address))) Address))) Address))) RoundTripTime) Options.Ttl)
// 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;