实验3 ICMP协议实践ping解析.doc

《实验3 ICMP协议实践ping解析.doc》由会员上传分享，免费在线阅读，更多相关内容在行业资料-天天文库。

1、计算机网络实验上机指导书专业班级学号姓名沈阳工程学院信息工程系实验2ICMP协议实践--ping解析一．实验目的掌握ICMP原理，利用其实现网络主机状态测试。二．实验内容利用ICMP协议原理编程实现PING命令，测试目标主机是否可到达。并了解Ping实现原理。三．实验前的准备l了解ICMP原理及相关概念。l掌握相关软件编程知识。四．实验要求及实验软硬件环境【基本要求】l设计程序完成PING命令。l完成此项实验，完成实验报告。【实验组织方式】l个人实验【实验条件】l局域网环境下微机两台，编程软件。五．实验步骤.了解ICMP

2、原理以及网络编程（1）源程序：Windows////Ping.h//#pragmapack(1)#defineICMP_ECHOREPLY0#defineICMP_ECHOREQ8//IPHeader--RFC791typedefstructtagIPHDR{u_charVIHL;//VersionandIHLu_charTOS;//TypeOfServiceshortTotLen;//TotalLengthshortID;//IdentificationshortFlagOff;//FlagsandFragmentOf

3、fsetu_charTTL;//TimeToLiveu_charProtocol;//Protocolu_shortChecksum;//Checksumstructin_addriaSrc;//InternetAddress-Sourcestructin_addriaDst;//InternetAddress-Destination}IPHDR,*PIPHDR;//ICMPHeader-RFC792typedefstructtagICMPHDR{u_charType;//Typeu_charCode;//Codeu_s

4、hortChecksum;//Checksumu_shortID;//Identificationu_shortSeq;//SequencecharData;//Data}ICMPHDR,*PICMPHDR;#defineREQ_DATASIZE32//EchoRequestDatasize//ICMPEchoRequesttypedefstructtagECHOREQUEST{ICMPHDRicmpHdr;DWORDdwTime;charcData[REQ_DATASIZE];}ECHOREQUEST,*PECHORE

5、QUEST;//ICMPEchoReplytypedefstructtagECHOREPLY{IPHDRipHdr;ECHOREQUESTechoRequest;charcFiller[256];}ECHOREPLY,*PECHOREPLY;#pragmapack()////PING.C--PingprogramusingICMPandRAWSockets//#include#include#include#include"ping.h"//InternalFu

6、nctionsvoidPing(LPCSTRpstrHost);voidReportError(LPCSTRpstrFrom);intWaitForEchoReply(SOCKETs);u_shortin_cksum(u_short*addr,intlen);//ICMPEchoRequest/ReplyfunctionsintSendEchoRequest(SOCKET,LPSOCKADDR_IN);DWORDRecvEchoReply(SOCKET,LPSOCKADDR_IN,u_char*);//main()voi

7、dmain(intargc,char**argv){WSADATAwsaData;WORDwVersionRequested=MAKEWORD(1,1);intnRet;//Checkargumentsif(argc!=2){fprintf(stderr,"Usage:pinghostname");return;}//InitWinSocknRet=WSAStartup(wVersionRequested,&wsaData);if(nRet){fprintf(stderr,"Errorinitializing

8、WinSock");return;}//Checkversionif(wsaData.wVersion!=wVersionRequested){fprintf(stderr,"WinSockversionnotsupported");return;}//GodothepingPing(argv[1]);/