#include?“ping.h“????????????

struct?proto	proto_v4?=?{?proc_v4?send_v4?NULL?NULL?0?IPPROTO_ICMP?};

#ifdef	IPV6
struct?proto	proto_v6?=?{?proc_v6?send_v6?NULL?NULL?0?IPPROTO_ICMPV6?};
#endif

int?datalen?=?56;		/*?data?that?goes?with?ICMP?echo?request?*/
int?pingnum=4;
int?anjing=0;

int?getpostcount=0;
double?rttcount=0;
int?broadcasting=0;
int?setttl=0;
int?ttlnum=64;
void?printhelp（）{
printf（“-h	顯示幫助信息?\n“）;	
printf（“-t??	設置ttl值，只用于IPv4\n“）;	
printf（“-q	安靜模式。不顯示每個收到的包的分析結果，只在結束時，顯示匯總結果?\n“）;	

}
int?main（int?argc?char?**argv）
{
	int				c;
	struct?addrinfo	*ai;

	opterr?=?0;		/*?don‘t?want?getopt（）?writing?to?stderr?*/
	while?（?（c?=?getopt（argc?argv?“vhqbn:t:s:“））?!=?-1）?{
		switch?（c）?{
		case?‘v‘:
			verbose++;
			break;
		case‘h‘:
			printf（“\n“）;	
			printhelp（）;
			exit（0）;
			break;
		case‘q‘:
			anjing=1;
			break;
		case‘b‘:
			broadcasting=1;
			break;
		case‘n‘:
			pingnum=atoi（argv[optind-1]）;
			break;
		case‘s‘:
			datalen=atoi（argv[optind-1]）;
			if（datalen>1024||datalen<0）
				printf（“數據包長度應大于0小于1024\n“）;
			break;
		case‘t‘:
			setttl=1;
			ttlnum?=?atoi（argv[optind-1]）;?
			break;
		case?‘?‘:
			err_quit（“未知的命令?請輸入-h來查看幫助\n“）;
		}
	}

	if?（optind?!=?argc-1）
		err_quit（“usage:?ping?[?-v?]?“）;
	host?=?argv[optind];

	pid?=?getpid（）;
	signal（SIGALRM?sig_alrm）;

	ai?=?host_serv（host?NULL?0?0）;

	printf（“ping?%s?（%s）:?%d?data?bytes\n“?ai->ai_canonname
		???Sock_ntop_host（ai->ai_addr?ai->ai_addrlen）?datalen）;

		/*?4initialize?according?to?protocol?*/
	if?（ai->ai_family?==?AF_INET）?{
		pr?=?&proto_v4;
#ifdef	IPV6
	}?else?if?（ai->ai_family?==?AF_INET6）?{
		pr?=?&proto_v6;
		if?（IN6_IS_ADDR_V4MAPPED（&（（（struct?sockaddr_in6?*）
								?ai->ai_addr）->sin6_addr）））
			err_quit（“cannot?ping?IPv4-mapped?IPv6?address“）;
#endif
	}?else
		err_quit（“unknown?address?family?%d“?ai->ai_family）;

	pr->sasend?=?ai->ai_addr;
	pr->sarecv?=?calloc（1?ai->ai_addrlen）;
	pr->salen?=?ai->ai_addrlen;

	readloop（）;

	exit（0）;
}


void
proc_v4（char?*ptr?ssize_t?len?struct?timeval?*tvrecv）/*輸出結果*/
{
	int				hlen1?icmplen;
	double			rtt;
	struct?ip		*ip;
	struct?icmp		*icmp;
	struct?timeval	*tvsend;

	ip?=?（struct?ip?*）?ptr;		/*?start?of?IP?header?*/
	hlen1?=?ip->ip_hl?<
	icmp?=?（struct?icmp?*）?（ptr?+?hlen1）;	/*?start?of?ICMP?header?*/
	if?（?（icmplen?=?len?-?hlen1）?		err_quit（“icmplen?（%d）?
	if?（icmp->icmp_type?==?ICMP_ECHOREPLY）?{
		if?（icmp->icmp_id?!=?pid）
			return;			/*?not?a?response?to?our?ECHO_REQUEST?*/
		if?（icmplen?			err_quit（“icmplen?（%d）?
		tvsend?=?（struct?timeval?*）?icmp->icmp_data;
		tv_sub（tvrecv?tvsend）;
		rtt?=?tvrecv->tv_sec?*?1000.0?+?tvrecv->tv_usec?/?1000.0;
	
	if（anjing!=1）{
		printf（“%d?bytes?from?%s:?seq=%u?ttl=%d?rtt=%.3f?ms\n“
				icmplen?Sock_ntop_host（pr->sarecv?pr->salen）
				icmp->icmp_seq?ip->ip_ttl?rtt）;
			rttcount+=rtt;
			getpostcount++;
			}else{
			rttcount+=rtt;
			getpostcount++;
			}

	}?else?if?（ver