ping的c實現

       return answer;
}
/*設置ICMP報頭*/
int pack(int pack_no)
{       int i,packsize;
       struct icmp *icmp;
       struct timeval *tval;

       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;
packsize=8+datalen;
       tval= (struct timeval *)icmp->icmp_data;
       gettimeofday(tval,NULL);    /*記錄發送時間*/
       icmp->icmp_cksum=cal_chksum( (unsigned short *)icmp,packsize); /*校驗算法*/
       return packsize;
}

/*發送三個ICMP報文*/

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