TraceRoute(tracert)源码（基于Window IP帮助函数实现） 佟强 2008.11.4
TraceRoute实现原理 http://blog.csdn.net/microtong/archive/2008/11/04/3220450.aspx
本程序使用Windows IP帮助函数发送ICMP回显请求报文，实现tracert的功能，探测每一跳路由器的IP地址和往返时间。
- //TraceRoute2.cpp
- #include <stdio.h>
- #include <winsock2.h>
- #include <windows.h>
- #include <IPHlpApi.h>
- #include <IcmpAPI.h>
- #pragma comment(lib,"Iphlpapi.lib")
- #pragma comment(lib,"ws2_32.lib")
- int main(int argc,char* argv[]){
- if(argc!=2){
- printf("Usage: %s destIP/n",argv[0]);
- exit(-1);
- }
- WSADATA wsa;
- if(WSAStartup(MAKEWORD(2,2),&wsa)!=0){
- printf("WSAStartup failed./n");
- exit(-1);
- }
- //转换IP地址到整数
- unsigned long ip = inet_addr(argv[1]);
- if(ip==INADDR_NONE){
- //用户可能输入的是域名
- hostent* pHost = gethostbyname(argv[1]);
- //如果域名无法解析
- if(pHost==NULL){
- printf("Invalid IP or domain name: %s/n", argv[1]);
- exit(-1);
- }
- //取域名的第一个IP地址
- ip = *(unsigned long*)pHost->h_addr_list[0];
- printf("trace route to %s(%s)/n/n",argv[1],inet_ntoa(*(in_addr*)&ip));
- }else{
- printf("trace route to %s/n/n",argv[1]);
- }
- //打开ICMP句柄
- HANDLE hIcmp;
- if ((hIcmp = IcmpCreateFile()) == INVALID_HANDLE_VALUE){
- printf("/tUnable to open ICMP file./n");
- exit(-1);
- }
- //设置IP报头的TTL值
- IP_OPTION_INFORMATION IpOption;
- ZeroMemory(&IpOption,sizeof(IP_OPTION_INFORMATION));
- IpOption.Ttl = 1;
- //设置要发送的数据
- char SendData[32];
- memset(SendData,'0',sizeof(SendData));
- //设置接收缓冲区
- char ReplyBuffer[sizeof(ICMP_ECHO_REPLY)+32];
- PICMP_ECHO_REPLY pEchoReply = (PICMP_ECHO_REPLY)ReplyBuffer;
- BOOL bLoop = TRUE;
- int iMaxHop = 30;
- while(bLoop && iMaxHop--){
- printf("%2d: ",IpOption.Ttl);
- //发送ICMP回显请求
- if(IcmpSendEcho(hIcmp,(IPAddr)ip, SendData, sizeof(SendData), &IpOption,
- ReplyBuffer, sizeof(ReplyBuffer), 3000)!=0){
- if(pEchoReply->RoundTripTime==0){
- printf("/t<1ms");
- }else{
- printf("/t%dms",pEchoReply->RoundTripTime);
- }
- printf("/t%s/n",inet_ntoa(*(in_addr*)&(pEchoReply->Address)));
- //判断是否完成路由路径探测
- if((unsigned long)pEchoReply->Address==ip){
- printf("/nTrace complete./n");
- bLoop = FALSE;
- }
- }else{
- printf("/t*/tRequest time out./n");
- }
- IpOption.Ttl++;
- }
- IcmpCloseHandle(hIcmp);
- WSACleanup();
- return 0;
- }