Linux下Ping的实现代码(2)

// 接受
        memset(recvpacket, 0, sizeof(recvpacket));
        int fromlen = sizeof(from);
        n = recvfrom(sockfd, recvpacket, sizeof(recvpacket), 0, (struct sockaddr *)&from, &fromlen);
        if (n < 1) {
            break;
        }
       
        // 判断是否是自己Ping的回复
        char *from_ip = (char *)inet_ntoa(from.sin_addr);
        syslog(LOG_INFO,"fomr ip:%s",from_ip);
         if (strcmp(from_ip,ips) != 0)
         {
            syslog(LOG_INFO,"ip:%s,Ip wang",ips);
            break;
         }
       
        iph = (struct ip *)recvpacket;
   
        icmp=(struct icmp *)(recvpacket + (iph->ip_hl<<2));

syslog(LOG_INFO,"ip:%s,icmp->icmp_type:%d,icmp->icmp_id:%d",ips,icmp->icmp_type,icmp->icmp_id);
       // 判断Ping回复包的状态
        if (icmp->icmp_type == ICMP_ECHOREPLY && icmp->icmp_id == pid)
        {
            // 正常就退出循环
            break;
        }
        else
        {
            // 否则继续等
            continue;
        }
    }
   
    // 关闭socket
    close(sockfd);

syslog(LOG_INFO,"ip:%s,Success",ips);
    return SUCCESS;
}