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Linux用ICMP协议实现简单Ping网络监测功能
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From:?http://www.linuxidc.com/Linux/2012-05/61073.htm
ICMP是（Internet Control Message Protocol）Internet控制報文協議。它是TCP/IP協議族的一個子協議，用于在IP主機、路由器之間傳遞控制消息。控制消息是指網絡通不通、主機是否可達、路由是否可用等網絡本身的消息。這些控制消息雖然并不傳輸用戶數據，但是對于用戶數據的傳遞起著重要的作用。
ICMP協議是一種面向無連接的協議，用于傳輸出錯報告控制信息。它是一個非常重要的協議，它對于網絡安全具有極其重要的意義。
折騰半天，原來ICMP也是TCP/IP其中一種協議.那么監測網絡是否ping的通，就跟TCP協議差不多了。
步驟簡單歸納為：1.綁定套接字，2.發送數據包 3.接收數據包 4.解析數據包 #include?<stdio.h>? #include?<sys/socket.h>? #include?<netinet/in.h>? #include?<netinet/ip.h>? #include?<netinet/ip_icmp.h>? #include?<netdb.h> ?
#define?PACKET_SIZE?????4096? #define?ERROR???????????0? #define?SUCCESS?????????1? ?? ?? unsigned?short short int {?? ????int ????int ????unsigned?short ????unsigned?short ?????? ????while ????{?? ????????sum?+=?*w++;?? ????????nleft?-=?2;?? ????}?? ?????? ????if ????{????????? ????????*(unsigned?char char ????????sum?+=?answer;?? ????}?? ?????? ????sum?=?(sum?>>?16)?+?(sum?&?0xffff);?? ????sum?+=?(sum?>>?16);?? ????answer?=?~sum;?? ?????? ????return }?? ?? int char int {???????? ????struct ????int ????fd_set?readfds;???? ?????? ????struct ????struct ?????? ????bzero(&addr,sizeof ????addr.sin_family?=?AF_INET;???? ????addr.sin_addr.s_addr?=?inet_addr(ips);???? ?????? ????int ?????? ????sockfd?=?socket(AF_INET,?SOCK_RAW,?IPPROTO_ICMP);???? ????if ????{???? ????????printf("ip:%s,socket?error\n" ????????return ????}???? ?????? ????struct ?????? ????timeo.tv_sec?=?timeout?/?1000;???? ????timeo.tv_usec?=?timeout?%?1000;???? ?????? ????if sizeof ????{???? ????????printf("ip:%s,setsockopt?error\n" ????????return ????}???? ?????? ????char ????char ?????? ????memset(sendpacket,?0,?sizeof ?????? ????pid_t?pid;???? ?????? ????pid=getpid();???? ?????? ????struct ????struct ?????? ???? ????icmp=(struct ????icmp->icmp_type=ICMP_ECHO;???? ????icmp->icmp_code=0;???? ????icmp->icmp_cksum=0;???? ????icmp->icmp_seq=0;???? ????icmp->icmp_id=pid;??? ????tval=?(struct ????gettimeofday(tval,NULL);???? ????icmp->icmp_cksum=cal_chksum((unsigned?short sizeof struct ?????? ????int ?????? ????n?=?sendto(sockfd,?(char sizeof struct struct sizeof ????if ????{???? ????????printf("ip:%s,sendto?error\n" ????????return ????}???? ?????? ?????? ?????? ????while ????{???? ?????????? ????????FD_ZERO(&readfds);???? ????????FD_SET(sockfd,?&readfds);???? ????????maxfds?=?sockfd?+?1;???? ????????n?=?select(maxfds,?&readfds,?NULL,?NULL,?&timeo);???? ????????if ????????{???? ????????????printf("ip:%s,Time?out?error\n" ????????????close(sockfd);???? ????????????return ????????}???? ?????????? ?????????? ????????memset(recvpacket,?0,?sizeof ????????int sizeof ????????n?=?recvfrom(sockfd,?recvpacket,?sizeof struct ????????if ????????????break ????????}???? ?????????? ??????? ????????char char ?????????????? ????????if ????????{???? ????????????printf("NowPingip:%s?Fromip:%s\nNowPingip?is?not?same?to?Fromip,so?ping?wrong!\n" ????????????return ????????}???? ?????????? ????????iph?=?(struct ?????????? ????????icmp=(struct ?????????? ????????printf("ip:%s\n,icmp->icmp_type:%d\n,icmp->icmp_id:%d\n" ?????????? ????????if ????????{???? ?????????????? ????????????break ????????}???? ????????else ????????{???? ?????????????? ????????????continue ????????}???? ????}???? ?????? ????int {?? ????char ????printf("Please?input?ping?IP:" ????scanf("%s" ?????? ????if ????{?? ????????printf("Ping?succeed!\n" ????}?? ????else ????{?? ????????printf("Ping?wrong!\n" ????}?? ?????? }?? 測試結果：
root@an-virtual-machine:~/wyz/test# ./testping 總結
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