xref: /openbsd-src/usr.bin/netstat/show.c (revision 25c4e8bd056e974b28f4a0ffd39d76c190a56013) 
1 /*	$OpenBSD: show.c,v 1.59 2022/06/19 13:59:22 claudio Exp $	*/
2 /*	$NetBSD: show.c,v 1.1 1996/11/15 18:01:41 gwr Exp $	*/
3 
4 /*
5  * Copyright (c) 1983, 1988, 1993
6  *	The Regents of the University of California.  All rights reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. Neither the name of the University nor the names of its contributors
17  *    may be used to endorse or promote products derived from this software
18  *    without specific prior written permission.
19  *
20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30  * SUCH DAMAGE.
31  */
32 
33 #include <sys/socket.h>
34 #include <sys/sysctl.h>
35 
36 #include <net/if.h>
37 #include <net/if_dl.h>
38 #include <net/if_types.h>
39 #include <net/route.h>
40 #include <netinet/in.h>
41 #include <netinet/if_ether.h>
42 #include <netmpls/mpls.h>
43 #include <arpa/inet.h>
44 
45 #include <err.h>
46 #include <errno.h>
47 #include <netdb.h>
48 #include <stdio.h>
49 #include <stddef.h>
50 #include <stdlib.h>
51 #include <string.h>
52 #include <unistd.h>
53 #include <limits.h>
54 
55 #include "netstat.h"
56 
57 char	*any_ntoa(const struct sockaddr *);
58 char	*link_print(struct sockaddr *);
59 char	*label_print(struct sockaddr *);
60 
61 #define ROUNDUP(a) \
62 	((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
63 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
64 
65 /*
66  * Definitions for showing gateway flags.
67  */
68 struct bits {
69 	int	b_mask;
70 	char	b_val;
71 };
72 static const struct bits bits[] = {
73 	{ RTF_UP,	'U' },
74 	{ RTF_GATEWAY,	'G' },
75 	{ RTF_HOST,	'H' },
76 	{ RTF_REJECT,	'R' },
77 	{ RTF_DYNAMIC,	'D' },
78 	{ RTF_MODIFIED,	'M' },
79 	{ RTF_CLONING,	'C' },
80 	{ RTF_MULTICAST,'m' },
81 	{ RTF_LLINFO,	'L' },
82 	{ RTF_STATIC,	'S' },
83 	{ RTF_BLACKHOLE,'B' },
84 	{ RTF_PROTO3,	'3' },
85 	{ RTF_PROTO2,	'2' },
86 	{ RTF_PROTO1,	'1' },
87 	{ RTF_CLONED,	'c' },
88 	{ RTF_CACHED,	'h' },
89 	{ RTF_MPATH,	'P' },
90 	{ RTF_MPLS,	'T' },
91 	{ RTF_LOCAL,	'l' },
92 	{ RTF_BFD,	'F' },
93 	{ RTF_BROADCAST,'b' },
94 	{ RTF_CONNECTED,'n' },
95 	{ 0 }
96 };
97 
98 int	 WID_DST(int);
99 void	 p_rtentry(struct rt_msghdr *);
100 void	 pr_family(int);
101 void	 p_sockaddr(struct sockaddr *, struct sockaddr *, int, int);
102 void	 p_sockaddr_mpls(struct sockaddr *, struct sockaddr *, int, int);
103 void	 p_flags(int, char *);
104 char	*routename4(in_addr_t);
105 char	*routename6(struct sockaddr_in6 *);
106 
107 size_t
108 get_sysctl(const int *mib, u_int mcnt, char **buf)
109 {
110 	size_t needed;
111 
112 	while (1) {
113 		if (sysctl(mib, mcnt, NULL, &needed, NULL, 0) == -1)
114 			err(1, "sysctl-estimate");
115 		if (needed == 0)
116 			break;
117 		if ((*buf = realloc(*buf, needed)) == NULL)
118 			err(1, NULL);
119 		if (sysctl(mib, mcnt, *buf, &needed, NULL, 0) == -1) {
120 			if (errno == ENOMEM)
121 				continue;
122 			err(1, "sysctl");
123 		}
124 		break;
125 	}
126 
127 	return needed;
128 }
129 
130 /*
131  * Print routing tables.
132  */
133 void
134 p_rttables(int af, u_int tableid)
135 {
136 	struct rt_msghdr *rtm;
137 	char *buf = NULL, *next, *lim = NULL;
138 	size_t needed;
139 	int mib[7], mcnt;
140 
141 	mib[0] = CTL_NET;
142 	mib[1] = PF_ROUTE;
143 	mib[2] = 0;
144 	mib[3] = af;
145 	mib[4] = NET_RT_DUMP;
146 	mib[5] = 0;
147 	mib[6] = tableid;
148 	mcnt = 7;
149 
150 	needed = get_sysctl(mib, mcnt, &buf);
151 	lim = buf + needed;
152 
153 	printf("Routing tables\n");
154 
155 	if (buf) {
156 		for (next = buf; next < lim; next += rtm->rtm_msglen) {
157 			rtm = (struct rt_msghdr *)next;
158 			if (rtm->rtm_version != RTM_VERSION)
159 				continue;
160 			p_rtentry(rtm);
161 		}
162 	}
163 	free(buf);
164 }
165 
166 /*
167  * column widths; each followed by one space
168  * width of destination/gateway column
169  * strlen("fe80::aaaa:bbbb:cccc:dddd@gif0") == 30, strlen("/128") == 4
170  */
171 #define	WID_GW(af)	((af) == AF_INET6 ? 30 : 18)
172 
173 int
174 WID_DST(int af)
175 {
176 
177 	switch (af) {
178 	case AF_MPLS:
179 		return 9;
180 	case AF_INET6:
181 		return 34;
182 	default:
183 		return 18;
184 	}
185 }
186 
187 /*
188  * Print header for routing table columns.
189  */
190 void
191 pr_rthdr(int af, int Aflag)
192 {
193 	if (Aflag)
194 		printf("%-*.*s ", PLEN, PLEN, "Address");
195 	switch (af) {
196 	case PF_KEY:
197 		printf("%-18s %-5s %-18s %-5s %-5s %-22s\n",
198 		    "Source", "Port", "Destination",
199 		    "Port", "Proto", "SA(Address/Proto/Type/Direction)");
200 		break;
201 	case PF_MPLS:
202 		printf("%-9s %-9s %-6s %-18s %-6.6s %5.5s %8.8s %5.5s  %4.4s %s\n",
203 		    "In label", "Out label", "Op", "Gateway",
204 		    "Flags", "Refs", "Use", "Mtu", "Prio", "Interface");
205 		break;
206 	default:
207 		printf("%-*.*s %-*.*s %-6.6s %5.5s %8.8s %5.5s  %4.4s %s",
208 		    WID_DST(af), WID_DST(af), "Destination",
209 		    WID_GW(af), WID_GW(af), "Gateway",
210 		    "Flags", "Refs", "Use", "Mtu", "Prio", "Iface");
211 		if (vflag && !Aflag)
212 			printf(" %s", "Label");
213 		putchar('\n');
214 		break;
215 	}
216 }
217 
218 static void
219 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
220 {
221 	int	i;
222 
223 	for (i = 0; i < RTAX_MAX; i++) {
224 		if (addrs & (1 << i)) {
225 			rti_info[i] = sa;
226 			sa = (struct sockaddr *)((char *)(sa) +
227 			    ROUNDUP(sa->sa_len));
228 		} else
229 			rti_info[i] = NULL;
230 	}
231 }
232 
233 /*
234  * Print a routing table entry.
235  */
236 void
237 p_rtentry(struct rt_msghdr *rtm)
238 {
239 	static int	 old_af = -1;
240 	struct sockaddr	*sa = (struct sockaddr *)((char *)rtm + rtm->rtm_hdrlen);
241 	struct sockaddr	*mask, *rti_info[RTAX_MAX];
242 	char		 ifbuf[IF_NAMESIZE];
243 
244 	if (sa->sa_family == AF_KEY)
245 		return;
246 
247 	get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
248 
249 	if (Fflag && rti_info[RTAX_GATEWAY]->sa_family != sa->sa_family) {
250 		return;
251 	}
252 	if (old_af != sa->sa_family) {
253 		old_af = sa->sa_family;
254 		pr_family(sa->sa_family);
255 		pr_rthdr(sa->sa_family, 0);
256 	}
257 
258 	mask = rti_info[RTAX_NETMASK];
259 	if ((sa = rti_info[RTAX_DST]) == NULL)
260 		return;
261 
262 	p_sockaddr(sa, mask, rtm->rtm_flags, WID_DST(sa->sa_family));
263 	p_sockaddr_mpls(sa, rti_info[RTAX_SRC], rtm->rtm_mpls,
264 	    WID_DST(sa->sa_family));
265 
266 	p_sockaddr(rti_info[RTAX_GATEWAY], NULL, RTF_HOST,
267 	    WID_GW(sa->sa_family));
268 
269 	p_flags(rtm->rtm_flags, "%-6.6s ");
270 	printf("%5u %8llu ", rtm->rtm_rmx.rmx_refcnt,
271 	    rtm->rtm_rmx.rmx_pksent);
272 	if (rtm->rtm_rmx.rmx_mtu)
273 		printf("%5u ", rtm->rtm_rmx.rmx_mtu);
274 	else
275 		printf("%5s ", "-");
276 	putchar((rtm->rtm_rmx.rmx_locks & RTV_MTU) ? 'L' : ' ');
277 	printf("  %2d %-5.16s", rtm->rtm_priority,
278 	    if_indextoname(rtm->rtm_index, ifbuf));
279 	if (vflag && rti_info[RTAX_LABEL])
280 		printf(" %s", ((struct sockaddr_rtlabel *)
281 		    rti_info[RTAX_LABEL])->sr_label);
282 	putchar('\n');
283 }
284 
285 /*
286  * Print address family header before a section of the routing table.
287  */
288 void
289 pr_family(int af)
290 {
291 	char *afname;
292 
293 	switch (af) {
294 	case AF_INET:
295 		afname = "Internet";
296 		break;
297 	case AF_INET6:
298 		afname = "Internet6";
299 		break;
300 	case PF_KEY:
301 		afname = "Encap";
302 		break;
303 	case AF_MPLS:
304 		afname = "MPLS";
305 		break;
306 	default:
307 		afname = NULL;
308 		break;
309 	}
310 	if (afname)
311 		printf("\n%s:\n", afname);
312 	else
313 		printf("\nProtocol Family %d:\n", af);
314 }
315 
316 void
317 p_addr(struct sockaddr *sa, struct sockaddr *mask, int flags)
318 {
319 	p_sockaddr(sa, mask, flags, WID_DST(sa->sa_family));
320 }
321 
322 void
323 p_gwaddr(struct sockaddr *sa, int af)
324 {
325 	p_sockaddr(sa, 0, RTF_HOST, WID_GW(af));
326 }
327 
328 void
329 p_sockaddr(struct sockaddr *sa, struct sockaddr *mask, int flags, int width)
330 {
331 	char *cp;
332 
333 	switch (sa->sa_family) {
334 	case AF_INET6:
335 	    {
336 		struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
337 #ifdef __KAME__
338 		struct in6_addr *in6 = &sa6->sin6_addr;
339 
340 		/*
341 		 * XXX: This is a special workaround for KAME kernels.
342 		 * sin6_scope_id field of SA should be set in the future.
343 		 */
344 		if ((IN6_IS_ADDR_LINKLOCAL(in6) ||
345 		    IN6_IS_ADDR_MC_LINKLOCAL(in6) ||
346 		    IN6_IS_ADDR_MC_INTFACELOCAL(in6)) &&
347 		    sa6->sin6_scope_id == 0) {
348 			/* XXX: override is ok? */
349 			sa6->sin6_scope_id = (u_int32_t)ntohs(*(u_short *)
350 			    &in6->s6_addr[2]);
351 			*(u_short *)&in6->s6_addr[2] = 0;
352 		}
353 #endif
354 		if (flags & RTF_HOST)
355 			cp = routename((struct sockaddr *)sa6);
356 		else
357 			cp = netname((struct sockaddr *)sa6, mask);
358 		break;
359 	    }
360 	case AF_MPLS:
361 		return;
362 	default:
363 		if ((flags & RTF_HOST) || mask == NULL)
364 			cp = routename(sa);
365 		else
366 			cp = netname(sa, mask);
367 		break;
368 	}
369 	if (width < 0)
370 		printf("%s", cp);
371 	else {
372 		if (nflag)
373 			printf("%-*s ", width, cp);
374 		else
375 			printf("%-*.*s ", width, width, cp);
376 	}
377 }
378 
379 static char line[HOST_NAME_MAX+1];
380 static char domain[HOST_NAME_MAX+1];
381 
382 void
383 p_sockaddr_mpls(struct sockaddr *in, struct sockaddr *out, int flags, int width)
384 {
385 	if (in->sa_family != AF_MPLS)
386 		return;
387 
388 	if (flags & MPLS_OP_POP || flags == MPLS_OP_LOCAL) {
389 		printf("%-*s ", width, label_print(in));
390 		printf("%-*s ", width, label_print(NULL));
391 	} else {
392 		printf("%-*s ", width, label_print(in));
393 		printf("%-*s ", width, label_print(out));
394 	}
395 
396 	printf("%-6s ", mpls_op(flags));
397 }
398 
399 void
400 p_flags(int f, char *format)
401 {
402 	char name[33], *flags;
403 	const struct bits *p = bits;
404 
405 	for (flags = name; p->b_mask && flags < &name[sizeof(name) - 2]; p++)
406 		if (p->b_mask & f)
407 			*flags++ = p->b_val;
408 	*flags = '\0';
409 	printf(format, name);
410 }
411 
412 char *
413 routename(struct sockaddr *sa)
414 {
415 	char *cp = NULL;
416 	static int first = 1;
417 
418 	if (first) {
419 		first = 0;
420 		if (gethostname(domain, sizeof(domain)) == 0 &&
421 		    (cp = strchr(domain, '.')))
422 			(void)strlcpy(domain, cp + 1, sizeof(domain));
423 		else
424 			domain[0] = '\0';
425 		cp = NULL;
426 	}
427 
428 	if (sa->sa_len == 0) {
429 		(void)strlcpy(line, "default", sizeof(line));
430 		return (line);
431 	}
432 
433 	switch (sa->sa_family) {
434 	case AF_INET:
435 		return
436 		    (routename4(((struct sockaddr_in *)sa)->sin_addr.s_addr));
437 
438 	case AF_INET6:
439 	    {
440 		struct sockaddr_in6 sin6;
441 
442 		memset(&sin6, 0, sizeof(sin6));
443 		memcpy(&sin6, sa, sa->sa_len);
444 		sin6.sin6_family = AF_INET6;
445 #ifdef __KAME__
446 		if (sa->sa_len == sizeof(struct sockaddr_in6) &&
447 		    (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
448 		     IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr) ||
449 		     IN6_IS_ADDR_MC_INTFACELOCAL(&sin6.sin6_addr)) &&
450 		    sin6.sin6_scope_id == 0) {
451 			sin6.sin6_scope_id =
452 			    ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
453 			sin6.sin6_addr.s6_addr[2] = 0;
454 			sin6.sin6_addr.s6_addr[3] = 0;
455 		}
456 #endif
457 		return (routename6(&sin6));
458 	    }
459 
460 	case AF_LINK:
461 		return (link_print(sa));
462 	case AF_MPLS:
463 		return (label_print(sa));
464 	case AF_UNSPEC:
465 		if (sa->sa_len == sizeof(struct sockaddr_rtlabel)) {
466 			static char name[RTLABEL_LEN];
467 			struct sockaddr_rtlabel *sr;
468 
469 			sr = (struct sockaddr_rtlabel *)sa;
470 			(void)strlcpy(name, sr->sr_label, sizeof(name));
471 			return (name);
472 		}
473 		/* FALLTHROUGH */
474 	default:
475 		(void)snprintf(line, sizeof(line), "(%d) %s",
476 		    sa->sa_family, any_ntoa(sa));
477 		break;
478 	}
479 	return (line);
480 }
481 
482 char *
483 routename4(in_addr_t in)
484 {
485 	char		*cp = NULL;
486 	struct in_addr	 ina;
487 	struct hostent	*hp;
488 
489 	if (!cp && !nflag) {
490 		if ((hp = gethostbyaddr((char *)&in,
491 		    sizeof(in), AF_INET)) != NULL) {
492 			if ((cp = strchr(hp->h_name, '.')) &&
493 			    !strcmp(cp + 1, domain))
494 				*cp = '\0';
495 			cp = hp->h_name;
496 		}
497 	}
498 	ina.s_addr = in;
499 	strlcpy(line, cp ? cp : inet_ntoa(ina), sizeof(line));
500 
501 	return (line);
502 }
503 
504 char *
505 routename6(struct sockaddr_in6 *sin6)
506 {
507 	int	 niflags = 0;
508 
509 	if (nflag)
510 		niflags |= NI_NUMERICHOST;
511 	else
512 		niflags |= NI_NOFQDN;
513 
514 	if (getnameinfo((struct sockaddr *)sin6, sizeof(*sin6),
515 	    line, sizeof(line), NULL, 0, niflags) != 0)
516 		strncpy(line, "invalid", sizeof(line));
517 
518 	return (line);
519 }
520 
521 /*
522  * Return the name of the network whose address is given.
523  * The address is assumed to be that of a net or subnet, not a host.
524  */
525 char *
526 netname4(in_addr_t in, in_addr_t mask)
527 {
528 	int mbits;
529 
530 	in = ntohl(in);
531 	mask = ntohl(mask);
532 	mbits = mask ? 33 - ffs(mask) : 0;
533 	if (in == INADDR_ANY && mask == INADDR_ANY)
534 		strlcpy(line, "default", sizeof(line));
535 #define C(x)	((x) & 0xff)
536 	else if (mbits < 9)
537 		snprintf(line, sizeof(line), "%u/%d", C(in >> 24), mbits);
538 	else if (mbits < 17)
539 		snprintf(line, sizeof(line), "%u.%u/%d",
540 		    C(in >> 24) , C(in >> 16), mbits);
541 	else if (mbits < 25)
542 		snprintf(line, sizeof(line), "%u.%u.%u/%d",
543 		    C(in >> 24), C(in >> 16), C(in >> 8), mbits);
544 	else
545 		snprintf(line, sizeof(line), "%u.%u.%u.%u/%d", C(in >> 24),
546 		    C(in >> 16), C(in >> 8), C(in), mbits);
547 #undef C
548 	return (line);
549 }
550 
551 char *
552 netname6(struct sockaddr_in6 *sa6, struct sockaddr_in6 *mask)
553 {
554 	struct sockaddr_in6 sin6;
555 	u_char *p;
556 	int masklen, final = 0, illegal = 0;
557 	int i, lim, flag, error;
558 	char hbuf[NI_MAXHOST];
559 
560 	sin6 = *sa6;
561 
562 	flag = 0;
563 	masklen = 0;
564 	if (mask) {
565 		lim = mask->sin6_len - offsetof(struct sockaddr_in6, sin6_addr);
566 		lim = lim < (int)sizeof(struct in6_addr) ?
567 		    lim : (int)sizeof(struct in6_addr);
568 		for (p = (u_char *)&mask->sin6_addr, i = 0; i < lim; p++) {
569 			if (final && *p) {
570 				illegal++;
571 				sin6.sin6_addr.s6_addr[i++] = 0x00;
572 				continue;
573 			}
574 
575 			switch (*p & 0xff) {
576 			case 0xff:
577 				masklen += 8;
578 				break;
579 			case 0xfe:
580 				masklen += 7;
581 				final++;
582 				break;
583 			case 0xfc:
584 				masklen += 6;
585 				final++;
586 				break;
587 			case 0xf8:
588 				masklen += 5;
589 				final++;
590 				break;
591 			case 0xf0:
592 				masklen += 4;
593 				final++;
594 				break;
595 			case 0xe0:
596 				masklen += 3;
597 				final++;
598 				break;
599 			case 0xc0:
600 				masklen += 2;
601 				final++;
602 				break;
603 			case 0x80:
604 				masklen += 1;
605 				final++;
606 				break;
607 			case 0x00:
608 				final++;
609 				break;
610 			default:
611 				final++;
612 				illegal++;
613 				break;
614 			}
615 
616 			if (!illegal)
617 				sin6.sin6_addr.s6_addr[i++] &= *p;
618 			else
619 				sin6.sin6_addr.s6_addr[i++] = 0x00;
620 		}
621 		while (i < (int)sizeof(struct in6_addr))
622 			sin6.sin6_addr.s6_addr[i++] = 0x00;
623 	} else
624 		masklen = 128;
625 
626 	if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr))
627 		return ("default");
628 
629 	if (illegal)
630 		warnx("illegal prefixlen");
631 
632 	if (nflag)
633 		flag |= NI_NUMERICHOST;
634 	error = getnameinfo((struct sockaddr *)&sin6, sizeof(sin6),
635 	    hbuf, sizeof(hbuf), NULL, 0, flag);
636 	if (error)
637 		snprintf(hbuf, sizeof(hbuf), "invalid");
638 
639 	snprintf(line, sizeof(line), "%s/%d", hbuf, masklen);
640 	return (line);
641 }
642 
643 /*
644  * Return the name of the network whose address is given.
645  * The address is assumed to be that of a net or subnet, not a host.
646  */
647 char *
648 netname(struct sockaddr *sa, struct sockaddr *mask)
649 {
650 	switch (sa->sa_family) {
651 	case AF_INET:
652 		return netname4(((struct sockaddr_in *)sa)->sin_addr.s_addr,
653 		    mask->sa_len == 0 ? 0 :
654 		    ((struct sockaddr_in *)mask)->sin_addr.s_addr);
655 	case AF_INET6:
656 		return netname6((struct sockaddr_in6 *)sa,
657 		    (struct sockaddr_in6 *)mask);
658 	case AF_LINK:
659 		return (link_print(sa));
660 	case AF_MPLS:
661 		return (label_print(sa));
662 	default:
663 		snprintf(line, sizeof(line), "af %d: %s",
664 		    sa->sa_family, any_ntoa(sa));
665 		break;
666 	}
667 	return (line);
668 }
669 
670 static const char hexlist[] = "0123456789abcdef";
671 
672 char *
673 any_ntoa(const struct sockaddr *sa)
674 {
675 	static char obuf[240];
676 	const char *in = sa->sa_data;
677 	char *out = obuf;
678 	int len = sa->sa_len - offsetof(struct sockaddr, sa_data);
679 
680 	*out++ = 'Q';
681 	do {
682 		*out++ = hexlist[(*in >> 4) & 15];
683 		*out++ = hexlist[(*in++)    & 15];
684 		*out++ = '.';
685 	} while (--len > 0 && (out + 3) < &obuf[sizeof(obuf) - 1]);
686 	out[-1] = '\0';
687 	return (obuf);
688 }
689 
690 char *
691 link_print(struct sockaddr *sa)
692 {
693 	struct sockaddr_dl	*sdl = (struct sockaddr_dl *)sa;
694 	u_char			*lla = (u_char *)sdl->sdl_data + sdl->sdl_nlen;
695 
696 	if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
697 	    sdl->sdl_slen == 0) {
698 		(void)snprintf(line, sizeof(line), "link#%d", sdl->sdl_index);
699 		return (line);
700 	}
701 	switch (sdl->sdl_type) {
702 	case IFT_ETHER:
703 	case IFT_CARP:
704 		return (ether_ntoa((struct ether_addr *)lla));
705 	default:
706 		return (link_ntoa(sdl));
707 	}
708 }
709 
710 char *
711 mpls_op(u_int32_t type)
712 {
713 	switch (type & (MPLS_OP_PUSH | MPLS_OP_POP | MPLS_OP_SWAP)) {
714 	case MPLS_OP_LOCAL:
715 		return ("LOCAL");
716 	case MPLS_OP_POP:
717 		return ("POP");
718 	case MPLS_OP_SWAP:
719 		return ("SWAP");
720 	case MPLS_OP_PUSH:
721 		return ("PUSH");
722 	default:
723 		return ("?");
724 	}
725 }
726 
727 char *
728 label_print(struct sockaddr *sa)
729 {
730 	struct sockaddr_mpls	*smpls = (struct sockaddr_mpls *)sa;
731 
732 	if (smpls)
733 		(void)snprintf(line, sizeof(line), "%u",
734 		    ntohl(smpls->smpls_label) >> MPLS_LABEL_OFFSET);
735 	else
736 		(void)snprintf(line, sizeof(line), "-");
737 
738 	return (line);
739 }
740