1、RouteTrace.cpp/ RouteTrace.cpp : Defines the class behaviors for the application.#include stdafx.hRouteTrace.hRouteTraceDlg.h#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE = _FILE_;#endif/ CRouteTraceAppBEGIN_MESSAGE_MAP(CRouteTraceApp, CWinApp) /AFX_MSG_MAP(CRouteTraceApp)
2、/ NOTE - the ClassWizard will add and remove mapping macros here. / DO NOT EDIT what you see in these blocks of generated code! /AFX_MSG ON_MAND(ID_HELP, CWinApp:OnHelp)END_MESSAGE_MAP()/ CRouteTraceApp constructionCRouteTraceApp:CRouteTraceApp() / TODO: add construction code here, / Place all signi
3、ficant initialization in InitInstance/ The one and only CRouteTraceApp objectCRouteTraceApp theApp;/ CRouteTraceApp initializationBOOL CRouteTraceApp:InitInstance() AfxEnableControlContainer(); / Standard initialization / If you are not using these features and wish to reduce the size / of your fina
4、l executable, you should remove from the following / the specific initialization routines you do not need.#ifdef _AFXDLL Enable3dControls(); / Call this when using MFC in a shared DLL#else Enable3dControlsStatic(); / Call this when linking to MFC statically CRouteTraceDlg dlg; m_pMainWnd = &dlg; int
5、 nResponse = dlg.DoModal(); if (nResponse = IDOK) / TODO: Place code here to handle when the dialog is / dismissed with OK else if (nResponse = IDCANCEL) / TODO: / dismissed with Cancel / Since the dialog has been closed, return FALSE so that we exit the / application, rather than start the applicat
6、ions message pump. return FALSE;ICMP.cpp / ICMP.cpp: implementation of the CICMP class.ICMP.hws2tcpip.hstatic char THIS_FILE=_FILE_;/ Construction/DestructionCICMP:CICMP() winsock = 0; m_pIp = NULL; m_pIcmp = NULL; m_pIp = (IP_HEAD *)new BYTEMAX_PACKET; m_pIcmp = (ICMP_HEAD *)new BYTEMAX_PACKET;CICM
7、P() delete m_pIp; delete m_pIcmp;BOOL CICMP:Initialize() WSADATA wsadata; if( WSAStartup(MAKEWORD(2, 1),&wsadata) ) AfxMessageBox(WSAStartup初始化失败!); return FALSE; winsock= WSASocket (AF_INET, /建立socket SOCK_RAW, IPPROTO_ICMP, NULL, 0,0); if(!winsock) AfxMessageBox( Socket创立失败! int timeout =5000; set
8、sockopt(winsock,SOL_SOCKET,SO_RCVTIMEO,(char *)&timeout, /设置接收超时 sizeof(timeout); timeout = 5000; setsockopt(winsock,SOL_SOCKET,SO_SNDTIMEO,(char *)&timeout, /设置发送超时 return TRUE;void CICMP:Uninitialize() /释放Socket if(winsock) closesocket(winsock); WSACleanup();USHORT CICMP:CheckSum(USHORT *buffer, i
9、nt size) /计算校验和 unsigned long cksum = 0; while(size 1) cksum+=*buffer+; size -=sizeof(USHORT); if(size ) cksum += *(UCHAR*)buffer; cksum = (cksum 16) + (cksum & 0xffff); cksum += (cksum 16); return (USHORT)(cksum);SendICMPPack(char *pAddr) sockaddr_in sockAddr; memset(void *)&sockAddr,0,sizeof(sockA
10、ddr); sockAddr.sin_family = AF_INET; sockAddr.sin_port = 0; sockAddr.sin_addr.S_un.S_addr=inet_addr(pAddr); return SendICMPPack(&sockAddr);/-设置TTL-int CICMP:SetTTL(int TTL) int nRet=setsockopt(winsock, IPPROTO_IP, IP_TTL,(LPSTR)&TTL,sizeof(int); if(nRet=SOCKET_ERROR) CString ttlerr; ttlerr.Format(设置
11、 TTL 错误! AfxMessageBox(ttlerr); return 0; return 1;/-发送-SendICMPPack(sockaddr_in *pAddr) /填充ICMP数据各项 int state; char *p_data; m_pIcmp-type = ICMP_ECHO;code = 0;ID = (USHORT)GetCurrentProcessId();number = 0;time = GetTickCount();cksum = 0; /填充数据 p_data = (char *)m_pIcmp + sizeof(ICMP_HEAD); memset(ch
12、ar *)p_data,0,DEF_PACKET); /检查和cksum = CheckSum(USHORT *)m_pIcmp, DEF_PACKET+sizeof(ICMP_HEAD); /发送数据 state = sendto(winsock,(char *)m_pIcmp, DEF_PACKET+sizeof(ICMP_HEAD), NULL,(struct sockaddr *)pAddr,sizeof(sockaddr); if(state = SOCKET_ERROR) if(GetLastError()=WSAETIMEDOUT) m_strInfo = 连接超时!(发送);
13、else m_strInfo=出现未知发送错误! if(state DEF_PACKET) m_strInfo = 发送数据错误! memcpy(void *)&m_sockAddr,(void *)pAddr, sizeof(sockaddr_in);/-接收数据-RecvICMPPack() int len = sizeof(sockaddr_in); char * addr; struct hostent *lpHostent = NULL; int Maxfd = 1; / 监视的最大的文件描述符值+1 fd_set readFdSet; / 设置文件描述符 struct timeva
14、l Timeout; addr = inet_ntoa(m_sockAddr.sin_addr); FD_ZERO(&readFdSet); FD_SET(winsock, & Maxfd = max(Maxfd, winsock) + 1; Timeout.tv_sec = 10; / 设置响应时间限制 Timeout.tv_usec = 0; int e = :select(Maxfd, &readFdSet, NULL, NULL, &Timeout); /获取多路复用套接字的响应结果 if(e HeadLen * 4 ; if (state type) case ICMP_ECHORE
15、PLY: /收到正常回显接收到%s %d字节响应数据,响应时间:%dms., inet_ntoa(m_sockAddr.sin_addr),len,GetTickCount()-p_icmprev-time); routeaddr=addr; RouteState=到达目的主机! break; case ICMP_TTLOUT: / TTL超时 routeaddr=inet_ntoa(m_sockAddr.sin_addr); routestate=1; RouteState=测试到路由器! return TRUE; case ICMP_DESUNREACH: /目的不可达 m_strInfo
16、 = 目的不可达! routestate=0;目的不可达 default : routestate=0; routeaddr=* m_strInfo=未知错误! RouteState=不明状态! return TRUE;2、命令行窗口下运行:tracert c:iknowdocsharedatacur_work.sohu.163. 命令,记录运行结果和IP地址。3、用RouteTrace程序执行到2中IP的路由跟踪,记录结果。4、由于该程序在编制过程中没有考虑路由器不返回应答报文这一情况,因此程序在未收到报文的情况下执行处理流程存在显示错误,请找出问题所在的代码将其更正,正确显示为如下的结果:四、实验要求及考前须知代码主要容已经添加了注释,重点理解ICMP.cpp中接收数据局部的代码。充分利用网络搜索,查找相关资料。五、实验总结 此次实验主要是学习分析程序功能构造,在Visual C+6.0 中调试通过,从而熟悉ICMP协议的工作原理和路由跟踪的原理。同时还可以根据实际需要修改程序中的参数,通过这次学习对路由跟踪有了更深刻的认识。
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