proc_v6.c

来自「《unix网络编程第二卷》中的源代码」· C语言 代码 · 共 43 行

#include	"ping.h"

void
proc_v6(char *ptr, ssize_t len, struct timeval* tvrecv)
{
#ifdef	IPV6
	int					hlen1, icmp6len;
	double				rtt;
	struct ip6_hdr		*ip6;
	struct icmp6_hdr	*icmp6;
	struct timeval		*tvsend;

	ip6 = (struct ip6_hdr *) ptr;		/* start of IPv6 header */
	hlen1 = sizeof(struct ip6_hdr);
	if (ip6->ip6_nxt != IPPROTO_ICMPV6)
		err_quit("next header not IPPROTO_ICMPV6");

	icmp6 = (struct icmp6_hdr *) (ptr + hlen1);
	if ( (icmp6len = len - hlen1) < 8)
		err_quit("icmp6len (%d) < 8", icmp6len);

	if (icmp6->icmp6_type == ICMP6_ECHO_REPLY) {
		if (icmp6->icmp6_id != pid)
			return;			/* not a response to our ECHO_REQUEST */
		if (icmp6len < 16)
			err_quit("icmp6len (%d) < 16", icmp6len);

		tvsend = (struct timeval *) (icmp6 + 1);
		tv_sub(tvrecv, tvsend);
		rtt = tvrecv->tv_sec * 1000.0 + tvrecv->tv_usec / 1000.0;

		printf("%d bytes from %s: seq=%u, hlim=%d, rtt=%.3f ms\n",
				icmp6len, Sock_ntop_host(pr->sarecv, pr->salen),
				icmp6->icmp6_seq, ip6->ip6_hlim, rtt);

	} else if (verbose) {
		printf("  %d bytes from %s: type = %d, code = %d\n",
				icmp6len, Sock_ntop_host(pr->sarecv, pr->salen),
				icmp6->icmp6_type, icmp6->icmp6_code);
	}
#endif	/* IPV6 */
}