ping6.c

IPv6环境中的ping实现

			    (mtuctl->ip6m_addr.sin6_scope_id &&
			     dst.sin6_scope_id &&
			     mtuctl->ip6m_addr.sin6_scope_id !=
			     dst.sin6_scope_id)) {
				if ((options & F_VERBOSE) != 0) {
					printf("path MTU for %s is notified. "
					       "(ignored)\n",
					   pr_addr((struct sockaddr *)&mtuctl->ip6m_addr,
					   sizeof(mtuctl->ip6m_addr)));
				}
				return(0);
			}

			/*
			 * Ignore an invalid MTU. XXX: can we just believe
			 * the kernel check?
			 */
			if (mtuctl->ip6m_mtu < IPV6_MMTU)
				return(0);

			/* notification for our destination. return the MTU. */
			return((int)mtuctl->ip6m_mtu);
		}
	}
#endif
	return(0);
}

/*
 * tvsub --
 *	Subtract 2 timeval structs:  out = out - in.  Out is assumed to
 * be >= in.
 */
void
tvsub(out, in)
	struct timeval *out, *in;
{
	if ((out->tv_usec -= in->tv_usec) < 0) {
		--out->tv_sec;
		out->tv_usec += 1000000;
	}
	out->tv_sec -= in->tv_sec;
}

/*
 * onint --
 *	SIGINT handler.
 */
/* ARGSUSED */
void
onint(notused)
	int notused;
{
	summary();

	(void)signal(SIGINT, SIG_DFL);
	(void)kill(getpid(), SIGINT);

	/* NOTREACHED */
	exit(1);
}

/*
 * summary --
 *	Print out statistics.
 */
void
summary()
{

	(void)printf("\n--- %s ping6 statistics ---\n", hostname);
	(void)printf("%ld packets transmitted, ", ntransmitted);
	(void)printf("%ld packets received, ", nreceived);
	if (nrepeats)
		(void)printf("+%ld duplicates, ", nrepeats);
	if (ntransmitted) {
		if (nreceived > ntransmitted)
			(void)printf("-- somebody's duplicating packets!");
		else
			(void)printf("%d%% packet loss",
			    (int) (((ntransmitted - nreceived) * 100) /
			    ntransmitted));
	}
	(void)putchar('\n');
	if (nreceived && timing) {
		/* Only display average to microseconds */
		double num = nreceived + nrepeats;
		double avg = tsum / num;
#if defined(__OpenBSD__) || defined(__NetBSD__) || defined(__FreeBSD__)
		double dev = sqrt(tsumsq / num - avg * avg);
		(void)printf(
		    "round-trip min/avg/max/std-dev = %.3f/%.3f/%.3f/%.3f ms\n",
		    tmin, avg, tmax, dev);
#else
		(void)printf(
		    "round-trip min/avg/max = %.3f/%.3f/%.3f ms\n",
		    tmin, avg, tmax);
#endif
		(void)fflush(stdout);
	}
	(void)fflush(stdout);
}

/*subject type*/
static const char *niqcode[] = {
	"IPv6 address",
	"DNS label",	/*or empty*/
	"IPv4 address",
};

/*result code*/
static const char *nircode[] = {
	"Success", "Refused", "Unknown",
};


/*
 * pr_icmph --
 *	Print a descriptive string about an ICMP header.
 */
void
pr_icmph(icp, end)
	struct icmp6_hdr *icp;
	u_char *end;
{
	char ntop_buf[INET6_ADDRSTRLEN];
	struct nd_redirect *red;
	struct icmp6_nodeinfo *ni;
	char dnsname[MAXDNAME + 1];
	const u_char *cp;
	size_t l;

	switch (icp->icmp6_type) {
	case ICMP6_DST_UNREACH:
		switch (icp->icmp6_code) {
		case ICMP6_DST_UNREACH_NOROUTE:
			(void)printf("No Route to Destination\n");
			break;
		case ICMP6_DST_UNREACH_ADMIN:
			(void)printf("Destination Administratively "
			    "Unreachable\n");
			break;
		case ICMP6_DST_UNREACH_BEYONDSCOPE:
			(void)printf("Destination Unreachable Beyond Scope\n");
			break;
		case ICMP6_DST_UNREACH_ADDR:
			(void)printf("Destination Host Unreachable\n");
			break;
		case ICMP6_DST_UNREACH_NOPORT:
			(void)printf("Destination Port Unreachable\n");
			break;
		default:
			(void)printf("Destination Unreachable, Bad Code: %d\n",
			    icp->icmp6_code);
			break;
		}
		/* Print returned IP header information */
		pr_retip((struct ip6_hdr *)(icp + 1), end);
		break;
	case ICMP6_PACKET_TOO_BIG:
		(void)printf("Packet too big mtu = %d\n",
		    (int)ntohl(icp->icmp6_mtu));
		pr_retip((struct ip6_hdr *)(icp + 1), end);
		break;
	case ICMP6_TIME_EXCEEDED:
		switch (icp->icmp6_code) {
		case ICMP6_TIME_EXCEED_TRANSIT:
			(void)printf("Time to live exceeded\n");
			break;
		case ICMP6_TIME_EXCEED_REASSEMBLY:
			(void)printf("Frag reassembly time exceeded\n");
			break;
		default:
			(void)printf("Time exceeded, Bad Code: %d\n",
			    icp->icmp6_code);
			break;
		}
		pr_retip((struct ip6_hdr *)(icp + 1), end);
		break;
	case ICMP6_PARAM_PROB:
		(void)printf("Parameter problem: ");
		switch (icp->icmp6_code) {
		case ICMP6_PARAMPROB_HEADER:
			(void)printf("Erroneous Header ");
			break;
		case ICMP6_PARAMPROB_NEXTHEADER:
			(void)printf("Unknown Nextheader ");
			break;
		case ICMP6_PARAMPROB_OPTION:
			(void)printf("Unrecognized Option ");
			break;
		default:
			(void)printf("Bad code(%d) ", icp->icmp6_code);
			break;
		}
		(void)printf("pointer = 0x%02x\n",
		    (u_int32_t)ntohl(icp->icmp6_pptr));
		pr_retip((struct ip6_hdr *)(icp + 1), end);
		break;
	case ICMP6_ECHO_REQUEST:
		(void)printf("Echo Request");
		/* XXX ID + Seq + Data */
		break;
	case ICMP6_ECHO_REPLY:
		(void)printf("Echo Reply");
		/* XXX ID + Seq + Data */
		break;
	case ICMP6_MEMBERSHIP_QUERY:
		(void)printf("Listener Query");
		break;
	case ICMP6_MEMBERSHIP_REPORT:
		(void)printf("Listener Report");
		break;
	case ICMP6_MEMBERSHIP_REDUCTION:
		(void)printf("Listener Done");
		break;
	case ND_ROUTER_SOLICIT:
		(void)printf("Router Solicitation");
		break;
	case ND_ROUTER_ADVERT:
		(void)printf("Router Advertisement");
		break;
	case ND_NEIGHBOR_SOLICIT:
		(void)printf("Neighbor Solicitation");
		break;
	case ND_NEIGHBOR_ADVERT:
		(void)printf("Neighbor Advertisement");
		break;
	case ND_REDIRECT:
		red = (struct nd_redirect *)icp;
		(void)printf("Redirect\n");
		if (!inet_ntop(AF_INET6, &red->nd_rd_dst, ntop_buf,
		    sizeof(ntop_buf)))
			strncpy(ntop_buf, "?", sizeof(ntop_buf));
		(void)printf("Destination: %s", ntop_buf);
		if (!inet_ntop(AF_INET6, &red->nd_rd_target, ntop_buf,
		    sizeof(ntop_buf)))
			strncpy(ntop_buf, "?", sizeof(ntop_buf));
		(void)printf(" New Target: %s", ntop_buf);
		break;
	case ICMP6_NI_QUERY:
		(void)printf("Node Information Query");
		/* XXX ID + Seq + Data */
		ni = (struct icmp6_nodeinfo *)icp;
		l = end - (u_char *)(ni + 1);
		printf(", ");
		switch (ntohs(ni->ni_qtype)) {
		case NI_QTYPE_NOOP:
			(void)printf("NOOP");
			break;
		case NI_QTYPE_SUPTYPES:
			(void)printf("Supported qtypes");
			break;
		case NI_QTYPE_FQDN:
			(void)printf("DNS name");
			break;
		case NI_QTYPE_NODEADDR:
			(void)printf("nodeaddr");
			break;
		case NI_QTYPE_IPV4ADDR:
			(void)printf("IPv4 nodeaddr");
			break;
		default:
			(void)printf("unknown qtype");
			break;
		}
		if (options & F_VERBOSE) {
			switch (ni->ni_code) {
			case ICMP6_NI_SUBJ_IPV6:
				if (l == sizeof(struct in6_addr) &&
				    inet_ntop(AF_INET6, ni + 1, ntop_buf,
				    sizeof(ntop_buf)) != NULL) {
					(void)printf(", subject=%s(%s)",
					    niqcode[ni->ni_code], ntop_buf);
				} else {
#if 1
					/* backward compat to -W */
					(void)printf(", oldfqdn");
#else
					(void)printf(", invalid");
#endif
				}
				break;
			case ICMP6_NI_SUBJ_FQDN:
				if (end == (u_char *)(ni + 1)) {
					(void)printf(", no subject");
					break;
				}
				printf(", subject=%s", niqcode[ni->ni_code]);
				cp = (const u_char *)(ni + 1);
				if (dnsdecode(&cp, end, NULL, dnsname,
				    sizeof(dnsname)) != NULL)
					printf("(%s)", dnsname);
				else
					printf("(invalid)");
				break;
			case ICMP6_NI_SUBJ_IPV4:
				if (l == sizeof(struct in_addr) &&
				    inet_ntop(AF_INET, ni + 1, ntop_buf,
				    sizeof(ntop_buf)) != NULL) {
					(void)printf(", subject=%s(%s)",
					    niqcode[ni->ni_code], ntop_buf);
				} else
					(void)printf(", invalid");
				break;
			default:
				(void)printf(", invalid");
				break;
			}
		}
		break;
	case ICMP6_NI_REPLY:
		(void)printf("Node Information Reply");
		/* XXX ID + Seq + Data */
		ni = (struct icmp6_nodeinfo *)icp;
		printf(", ");
		switch (ntohs(ni->ni_qtype)) {
		case NI_QTYPE_NOOP:
			(void)printf("NOOP");
			break;
		case NI_QTYPE_SUPTYPES:
			(void)printf("Supported qtypes");
			break;
		case NI_QTYPE_FQDN:
			(void)printf("DNS name");
			break;
		case NI_QTYPE_NODEADDR:
			(void)printf("nodeaddr");
			break;
		case NI_QTYPE_IPV4ADDR:
			(void)printf("IPv4 nodeaddr");
			break;
		default:
			(void)printf("unknown qtype");
			break;
		}
		if (options & F_VERBOSE) {
			if (ni->ni_code > sizeof(nircode) / sizeof(nircode[0]))
				printf(", invalid");
			else
				printf(", %s", nircode[ni->ni_code]);
		}
		break;
	default:
		(void)printf("Bad ICMP type: %d", icp->icmp6_type);
	}
}

/*
 * pr_iph --
 *	Print an IP6 header.
 */
void
pr_iph(ip6)
	struct ip6_hdr *ip6;
{
	u_int32_t flow = ip6->ip6_flow & IPV6_FLOWLABEL_MASK;
	u_int8_t tc;
	char ntop_buf[INET6_ADDRSTRLEN];

	tc = *(&ip6->ip6_vfc + 1); /* XXX */
	tc = (tc >> 4) & 0x0f;
	tc |= (ip6->ip6_vfc << 4);

	printf("Vr TC  Flow Plen Nxt Hlim\n");
	printf(" %1x %02x %05x %04x  %02x   %02x\n",
	    (ip6->ip6_vfc & IPV6_VERSION_MASK) >> 4, tc, (u_int32_t)ntohl(flow),
	    ntohs(ip6->ip6_plen), ip6->ip6_nxt, ip6->ip6_hlim);
	if (!inet_ntop(AF_INET6, &ip6->ip6_src, ntop_buf, sizeof(ntop_buf)))
		strncpy(ntop_buf, "?", sizeof(ntop_buf));
	printf("%s->", ntop_buf);
	if (!inet_ntop(AF_INET6, &ip6->ip6_dst, ntop_buf, sizeof(ntop_buf)))
		strncpy(ntop_buf, "?", sizeof(ntop_buf));
	printf("%s\n", ntop_buf);
}

/*
 * pr_addr --
 *	Return an ascii host address as a dotted quad and optionally with
 * a hostname.
 */
const char *
pr_addr(addr, addrlen)
	struct sockaddr *addr;
	int addrlen;
{
	static char buf[NI_MAXHOST];
	int flag = 0;

	if ((options & F_HOSTNAME) == 0)
		flag |= NI_NUMERICHOST;

	if (getnameinfo(addr, addrlen, buf, sizeof(buf), NULL, 0, flag) == 0)
		return (buf);
	else
		return "?";
}

/*
 * pr_retip --
 *	Dump some info on a returned (via ICMPv6) IPv6 packet.
 */
void
pr_retip(ip6, end)
	struct ip6_hdr *ip6;
	u_char *end;
{
	u_char *cp = (u_char *)ip6, nh;
	int hlen;

	if (end - (u_char *)ip6 < sizeof(*ip6)) {
		printf("IP6");
		goto trunc;
	}
	pr_iph(ip6);
	hlen = sizeof(*ip6);

	nh = ip6->ip6_nxt;
	cp += hlen;
	while (end - cp >= 8) {
		switch (nh) {
		case IPPROTO_HOPOPTS:
			printf("HBH ");
			hlen = (((struct ip6_hbh *)cp)->ip6h_len+1) << 3;
			nh = ((struct ip6_hbh *)cp)->ip6h_nxt;
			break;
		case IPPROTO_DSTOPTS:
			printf("DSTOPT ");
			hlen = (((struct ip6_dest *)cp)->ip6d_len+1) << 3;
			nh = ((struct ip6_dest *)cp)->ip6d_nxt;
			break;
		case IPPROTO_FRAGMENT:
			printf("FRAG ");
			hlen = sizeof(struct ip6_frag);
			nh = ((struct ip6_frag *)cp)->ip6f_nxt;
			break;
		case IPPROTO_ROUTING:
			printf("RTHDR ");
			hlen = (((struct ip6_rthdr *)cp)->ip6r_len+1) << 3;
			nh = ((struct ip6_rthdr *)cp)->ip6r_nxt;
			break;
#ifdef IPSEC
		case IPPROTO_AH:
			printf("AH ");
			hlen = (((struct ah *)cp)->ah_len+2) << 2;
			nh = ((struct ah *)cp)->ah_nxt;
			break;
#endif
		case IPPROTO_ICMPV6:
			printf("ICMP6: type = %d, code = %d\n",
			    *cp, *(cp + 1));
			return;
		case IPPROTO_ESP:
			printf("ESP\n");
			return;
		case IPPROTO_TCP:
			printf("TCP: from port %u, to port %u (decimal)\n",
			    (*cp * 256 + *(cp + 1)),
			    (*(cp + 2) * 256 + *(cp + 3)));
			return;
		case IPPROTO_UDP:
			printf("UDP: from port %u, to port %u (decimal)\n",
			    (*cp * 256 + *(cp + 1)),
			    (*(cp + 2) * 256 + *(cp + 3)));
			return;
		default:
			printf("Unknown Header(%d)\n", nh);
			return;
		}

		if ((cp += hlen) >= end)
			goto trunc;
	}
	if (end - cp < 8)
		goto trunc;

	putchar('\n');
	return;

  trunc:
	printf("...\n");
	return;
}

void
fill(bp, patp)
	char *bp, *patp;
{
	int ii, jj, kk;
	int pat[16];
	char *cp;

	for (cp = patp; *cp; cp++)
		if (!isxdigit(*cp))
			errx(1, "patterns must be specified as hex digits");
	ii = sscanf(patp,
	    "%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x%2x",
	    &pat[0], &pat[1], &pat[2], &pat[3], &pat[4], &pat[5], &pat[6],
	    &pat[7], &pat[8], &pat[9], &pat[10], &pat[11], &pat[12],
	    &pat[13], &pat[14], &pat[15]);

/* xxx */
	if (ii > 0)
		for (kk = 0;
		    kk <= MAXDATALEN - (8 + sizeof(struct tv32) + ii);
		    kk += ii)
			for (jj = 0; jj < ii; ++jj)
				bp[jj + kk] = pat[jj];
	if (!(options & F_QUIET)) {
		(void)printf("PATTERN: 0x");
		for (jj = 0; jj < ii; ++jj)
			(void)printf("%02x", bp[jj] & 0xFF);
		(void)printf("\n");
	}
}

#ifdef IPSEC
#ifdef IPSEC_POLICY_IPSEC
int
setpolicy(so, policy)
	int so;
	char *policy;
{
	char *buf;

	if (policy == NULL)
		re