在ICMP的应用中,我们可以使用ping命令来进行操作。本文就是介绍了这部分的应用。介绍了具体实现的代码。希望对大家学习ICMP有所帮助。
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"
#p#
- ==================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;
- }
#p#
- ==================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;