Ping应用程序实现代码.docx

Ping应用程序实现代码#include #include #include #include #include winsock.h #pragma comment(lib,Ws2_32); #define SEND_SIZE 32 #define PACKET_SIZE 4096 #define ICMP_ECHO 8 #define ICMP_ECHOREPLY 0 struct icmp unsigned char icmp_type; unsigned char icmp_code; unsigned short icmp_cksum; unsigned short icmp_id; unsigned short icmp_seq; unsigned long icmp_data; ; struct ip unsigned char ip_hl:4; unsigned char ip_v:4; unsigned char ip_tos; unsigned short ip_len; unsigned short ip_id; unsigned short ip_off; unsigned char ip_ttl; unsigned char ip_p; unsigned short ip_sum; unsigned long ip_src; unsigned long ip_dst; ; unsigned char sendpacketPACKET_SIZE; unsigned char recvpacketPACKET_SIZE; struct sockaddr_in dest_addr; struct sockaddr_in from_addr; int sockfd; int pid; unsigned short cal_chksum(unsigned short *addr,int len); int pack(int pack_no); int unpack(unsigned char *buf,int len); void send_packet(void); void recv_packet(void); void main() int argc;char *argv2; argc = 2; argv0= -t; argv1=192.168.1.2; struct hostent *host; struct protoent *protocol; WSADATA wsaData; int timeout=1000; int SEND_COUNT=4; int i; char *par_host; par_host=argvargc-1; /IP? switch(argc) case 2: break; case 3: if(strcmp(argv1,-t)=0) SEND_COUNT=10000; break; /fall through default: printf(usage: %s -t Host name or IP addressn,argv0); exit(1); if(WSAStartup(0x1010,&wsaData)!=0) printf(wsastartup errorn); exit(1); if( (protocol=getprotobyname(icmp) )=NULL) printf(getprotobyname errorn); exit(1); printf(%sn,protocol-p_name); printf(%sn,protocol-p_aliases); printf(%dn,protocol-p_proto); system(pause); if( (sockfd=socket(AF_INET,SOCK_RAW,protocol-p_proto) )0) printf(socket errorn); exit(1); if(setsockopt(sockfd,SOL_SOCKET,SO_RCVTIMEO,(char*)&timeout,sizeof(timeout)0) fprintf(stderr,failed to set recv timeout: %dn,WSAGetLastError(); if(setsockopt(sockfd,SOL_SOCKET,SO_SNDTIMEO,(char*)&timeout,sizeof(timeout)h_addr,host-h_length); /resolve address to hostname if(host=gethostbyaddr(host-h_addr,4,PF_INET) par_host=host-h_name; printf(%sn,par_host); else if( dest_addr.sin_addr.s_addr=inet_addr(par_host)=INADDR_NONE) printf(Unkown host %sn,par_host); exit(1); pid=getpid(); printf(%dn,pid); system(pause); printf(Pinging %s %s: with %d bytes of data:nn,par_host,inet_ntoa(dest_addr.sin_addr),SEND_SIZE); for(i=0;i1) sum+=*w+; nleft-=2; if( nleft=1) *(unsigned char *)(&answer)=*(unsigned char *)w; sum+=answer; sum=(sum16)+(sum&0xffff); sum+=(sum16); answer=sum; return answer; /? int pack(int pack_no) int packsize; struct icmp *icmp; packsize=8+SEND_SIZE; icmp=(struct icmp*)sendpacket; icmp-icmp_type=ICMP_ECHO; icmp-icmp_code=0; icmp-icmp_cksum=0; icmp-icmp_seq=pack_no; icmp-icmp_id=pid; icmp-icmp_data=GetTickCount(); icmp-icmp_cksum=cal_chksum( (unsigned short *)icmp,packsize); /*?*/ return packsize; /? int unpack(unsigned char *buf,int len) struct ip *ip; struct icmp *icmp; double rtt; int iphdrlen; ip=(struct ip *)buf; iphdrlen=ip-ip_hl*4; icmp=(struct icmp *)(buf+iphdrlen); if( (icmp-icmp_type=ICMP_ECHOREPLY) & (icmp-icmp_id=pid) ) len=len-iphdrlen-8; rtt=GetTickCount()-icmp-icmp_data; printf(Reply from %s: bytes=%d time=%.0fms TTL=%d icmp_seq=%un, inet_ntoa(from_addr.sin_addr), len, rtt, ip-ip_ttl, icmp-icmp_seq); return 1; return 0; /? void send_packet() int packetsize; static int pack_no=0; packetsize=pack(pack_no+); if( sendto(sockfd,(char *)sendpacket,packetsize,0,(st