1 /* $OpenBSD: show.c,v 1.122 2023/03/15 08:42:14 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 <net/rtable.h>
41 #include <netinet/in.h>
42 #include <netinet/if_ether.h>
43 #include <netmpls/mpls.h>
44 #include <arpa/inet.h>
45
46 #include <err.h>
47 #include <errno.h>
48 #include <netdb.h>
49 #include <stdio.h>
50 #include <stddef.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54 #include <limits.h>
55
56 #include "show.h"
57
58 char *any_ntoa(const struct sockaddr *);
59 char *link_print(struct sockaddr *);
60 char *label_print(struct sockaddr *);
61
62 #define ROUNDUP(a) \
63 ((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
64 #define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
65
66 /*
67 * Definitions for showing gateway flags.
68 */
69 struct bits {
70 int b_mask;
71 char b_val;
72 };
73 static const struct bits bits[] = {
74 { RTF_UP, 'U' },
75 { RTF_GATEWAY, 'G' },
76 { RTF_HOST, 'H' },
77 { RTF_REJECT, 'R' },
78 { RTF_DYNAMIC, 'D' },
79 { RTF_MODIFIED, 'M' },
80 { RTF_CLONING, 'C' },
81 { RTF_MULTICAST,'m' },
82 { RTF_LLINFO, 'L' },
83 { RTF_STATIC, 'S' },
84 { RTF_BLACKHOLE,'B' },
85 { RTF_PROTO3, '3' },
86 { RTF_PROTO2, '2' },
87 { RTF_PROTO1, '1' },
88 { RTF_CLONED, 'c' },
89 { RTF_CACHED, 'h' },
90 { RTF_MPATH, 'P' },
91 { RTF_MPLS, 'T' },
92 { RTF_LOCAL, 'l' },
93 { RTF_BFD, 'F' },
94 { RTF_BROADCAST,'b' },
95 { RTF_CONNECTED,'n' },
96 { 0 }
97 };
98
99 int WID_DST(int);
100 void pr_rthdr(int);
101 void p_rtentry(struct rt_msghdr *);
102 void pr_family(int);
103 void p_sockaddr_mpls(struct sockaddr *, struct sockaddr *, int, int);
104 void p_flags(int, char *);
105 char *routename4(in_addr_t);
106 char *routename6(struct sockaddr_in6 *);
107 char *netname4(in_addr_t, struct sockaddr_in *);
108 char *netname6(struct sockaddr_in6 *, struct sockaddr_in6 *);
109
110 size_t
get_sysctl(const int * mib,u_int mcnt,char ** buf)111 get_sysctl(const int *mib, u_int mcnt, char **buf)
112 {
113 size_t needed;
114
115 while (1) {
116 if (sysctl(mib, mcnt, NULL, &needed, NULL, 0) == -1)
117 err(1, "sysctl-estimate");
118 if (needed == 0)
119 break;
120 if ((*buf = realloc(*buf, needed)) == NULL)
121 err(1, NULL);
122 if (sysctl(mib, mcnt, *buf, &needed, NULL, 0) == -1) {
123 if (errno == ENOMEM)
124 continue;
125 err(1, "sysctl");
126 }
127 break;
128 }
129
130 return needed;
131 }
132
133 /*
134 * Print preferred source address
135 */
136 void
printsource(int af,u_int tableid)137 printsource(int af, u_int tableid)
138 {
139 struct sockaddr *sa, *sa4 = NULL, *sa6 = NULL;
140 char *buf = NULL, *next, *lim = NULL;
141 size_t needed;
142 int mib[7], mcnt;
143
144 mib[0] = CTL_NET;
145 mib[1] = PF_ROUTE;
146 mib[2] = 0;
147 mib[3] = af;
148 mib[4] = NET_RT_SOURCE;
149 mib[5] = tableid;
150 mcnt = 6;
151
152 needed = get_sysctl(mib, mcnt, &buf);
153 lim = buf + needed;
154
155 if (pledge("stdio", NULL) == -1)
156 err(1, "pledge");
157
158 if (buf) {
159 for (next = buf; next < lim; next += sa->sa_len) {
160 sa = (struct sockaddr *)next;
161 switch (sa->sa_family) {
162 case AF_INET:
163 sa4 = sa;
164 break;
165 case AF_INET6:
166 sa6 = sa;
167 break;
168 }
169 }
170 }
171
172 printf("Preferred source address set for rdomain %d\n", tableid);
173 printf("IPv4: ");
174 if (sa4 != NULL)
175 p_sockaddr(sa4, NULL, RTF_HOST, WID_DST(sa4->sa_family));
176 else
177 printf("default");
178 printf("\n");
179 printf("IPv6: ");
180 if (sa6 != NULL)
181 p_sockaddr(sa6, NULL, RTF_HOST, WID_DST(sa6->sa_family));
182 else
183 printf("default");
184 printf("\n");
185 free(buf);
186
187 exit(0);
188 }
189 /*
190 * Print routing tables.
191 */
192 void
p_rttables(int af,u_int tableid,char prio)193 p_rttables(int af, u_int tableid, char prio)
194 {
195 struct rt_msghdr *rtm;
196 char *buf = NULL, *next, *lim = NULL;
197 size_t needed;
198 int mib[7], mcnt;
199
200 mib[0] = CTL_NET;
201 mib[1] = PF_ROUTE;
202 mib[2] = 0;
203 mib[3] = af;
204 mib[4] = NET_RT_DUMP;
205 mib[5] = prio;
206 mib[6] = tableid;
207 mcnt = 7;
208
209 needed = get_sysctl(mib, mcnt, &buf);
210 lim = buf + needed;
211
212 if (pledge("stdio dns", NULL) == -1)
213 err(1, "pledge");
214
215 printf("Routing tables\n");
216
217 if (buf) {
218 for (next = buf; next < lim; next += rtm->rtm_msglen) {
219 rtm = (struct rt_msghdr *)next;
220 if (rtm->rtm_version != RTM_VERSION)
221 continue;
222 p_rtentry(rtm);
223 }
224 }
225 free(buf);
226 }
227
228 /*
229 * column widths; each followed by one space
230 * width of destination/gateway column
231 * strlen("2001:0db8:3333:4444:5555:6666:7777:8888") == 39
232 */
233 #define WID_GW(af) ((af) == AF_INET6 ? 39 : 18)
234
235 int
WID_DST(int af)236 WID_DST(int af)
237 {
238
239 switch (af) {
240 case AF_MPLS:
241 return 9;
242 case AF_INET6:
243 /* WID_GW() + strlen("/128") == 4 */
244 return 43;
245 default:
246 return 18;
247 }
248 }
249
250 /*
251 * Print header for routing table columns.
252 */
253 void
pr_rthdr(int af)254 pr_rthdr(int af)
255 {
256 switch (af) {
257 case PF_KEY:
258 printf("%-18s %-5s %-18s %-5s %-5s %-22s\n",
259 "Source", "Port", "Destination",
260 "Port", "Proto", "SA(Address/Proto/Type/Direction)");
261 break;
262 case PF_MPLS:
263 printf("%-9s %-9s %-6s %-18s %-6.6s %5.5s %8.8s %5.5s %4.4s %s\n",
264 "In label", "Out label", "Op", "Gateway",
265 "Flags", "Refs", "Use", "Mtu", "Prio", "Interface");
266 break;
267 default:
268 printf("%-*.*s %-*.*s %-6.6s %5.5s %8.8s %5.5s %4.4s %s",
269 WID_DST(af), WID_DST(af), "Destination",
270 WID_GW(af), WID_GW(af), "Gateway",
271 "Flags", "Refs", "Use", "Mtu", "Prio", "Iface");
272 if (verbose)
273 printf(" %s", "Label");
274 putchar('\n');
275 break;
276 }
277 }
278
279 void
get_rtaddrs(int addrs,struct sockaddr * sa,struct sockaddr ** rti_info)280 get_rtaddrs(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
281 {
282 int i;
283
284 for (i = 0; i < RTAX_MAX; i++) {
285 if (addrs & (1 << i)) {
286 rti_info[i] = sa;
287 sa = (struct sockaddr *)((char *)(sa) +
288 ROUNDUP(sa->sa_len));
289 } else
290 rti_info[i] = NULL;
291 }
292 }
293
294 /*
295 * Print a routing table entry.
296 */
297 void
p_rtentry(struct rt_msghdr * rtm)298 p_rtentry(struct rt_msghdr *rtm)
299 {
300 static int old_af = -1;
301 struct sockaddr *sa = (struct sockaddr *)((char *)rtm + rtm->rtm_hdrlen);
302 struct sockaddr *mask, *rti_info[RTAX_MAX];
303 char ifbuf[IF_NAMESIZE];
304 char *label;
305
306 if (sa->sa_family == AF_KEY)
307 return;
308
309 get_rtaddrs(rtm->rtm_addrs, sa, rti_info);
310
311 if (Fflag && rti_info[RTAX_GATEWAY]->sa_family != sa->sa_family) {
312 return;
313 }
314
315 if (strlen(so_label.rtlabel.sr_label)) {
316 if (!rti_info[RTAX_LABEL])
317 return;
318 label = ((struct sockaddr_rtlabel *)rti_info[RTAX_LABEL])->
319 sr_label;
320 if (strcmp(label, so_label.rtlabel.sr_label))
321 return;
322 }
323
324 if (old_af != sa->sa_family) {
325 old_af = sa->sa_family;
326 pr_family(sa->sa_family);
327 pr_rthdr(sa->sa_family);
328 }
329
330 mask = rti_info[RTAX_NETMASK];
331 if ((sa = rti_info[RTAX_DST]) == NULL)
332 return;
333
334 p_sockaddr(sa, mask, rtm->rtm_flags, WID_DST(sa->sa_family));
335 p_sockaddr_mpls(sa, rti_info[RTAX_SRC], rtm->rtm_mpls,
336 WID_DST(sa->sa_family));
337
338 p_sockaddr(rti_info[RTAX_GATEWAY], NULL, RTF_HOST,
339 WID_GW(sa->sa_family));
340
341 p_flags(rtm->rtm_flags, "%-6.6s ");
342 printf("%5u %8llu ", rtm->rtm_rmx.rmx_refcnt,
343 rtm->rtm_rmx.rmx_pksent);
344 if (rtm->rtm_rmx.rmx_mtu)
345 printf("%5u ", rtm->rtm_rmx.rmx_mtu);
346 else
347 printf("%5s ", "-");
348 putchar((rtm->rtm_rmx.rmx_locks & RTV_MTU) ? 'L' : ' ');
349 printf(" %2d %-5.16s", rtm->rtm_priority,
350 if_indextoname(rtm->rtm_index, ifbuf));
351 if (verbose && rti_info[RTAX_LABEL])
352 printf(" %s", routename(rti_info[RTAX_LABEL]));
353 putchar('\n');
354 }
355
356 /*
357 * Print address family header before a section of the routing table.
358 */
359 void
pr_family(int af)360 pr_family(int af)
361 {
362 char *afname;
363
364 switch (af) {
365 case AF_INET:
366 afname = "Internet";
367 break;
368 case AF_INET6:
369 afname = "Internet6";
370 break;
371 case PF_KEY:
372 afname = "Encap";
373 break;
374 case AF_MPLS:
375 afname = "MPLS";
376 break;
377 default:
378 afname = NULL;
379 break;
380 }
381 if (afname)
382 printf("\n%s:\n", afname);
383 else
384 printf("\nProtocol Family %d:\n", af);
385 }
386
387 void
p_sockaddr(struct sockaddr * sa,struct sockaddr * mask,int flags,int width)388 p_sockaddr(struct sockaddr *sa, struct sockaddr *mask, int flags, int width)
389 {
390 char *cp;
391
392 switch (sa->sa_family) {
393 case AF_INET6:
394 {
395 struct sockaddr_in6 *sa6 = (struct sockaddr_in6 *)sa;
396 #ifdef __KAME__
397 struct in6_addr *in6 = &sa6->sin6_addr;
398
399 /*
400 * XXX: This is a special workaround for KAME kernels.
401 * sin6_scope_id field of SA should be set in the future.
402 */
403 if ((IN6_IS_ADDR_LINKLOCAL(in6) ||
404 IN6_IS_ADDR_MC_LINKLOCAL(in6) ||
405 IN6_IS_ADDR_MC_INTFACELOCAL(in6)) &&
406 sa6->sin6_scope_id == 0) {
407 /* XXX: override is ok? */
408 sa6->sin6_scope_id = (u_int32_t)ntohs(*(u_short *)
409 &in6->s6_addr[2]);
410 *(u_short *)&in6->s6_addr[2] = 0;
411 }
412 #endif
413 if (flags & RTF_HOST)
414 cp = routename((struct sockaddr *)sa6);
415 else
416 cp = netname((struct sockaddr *)sa6, mask);
417 break;
418 }
419 case AF_MPLS:
420 return;
421 default:
422 if ((flags & RTF_HOST) || mask == NULL)
423 cp = routename(sa);
424 else
425 cp = netname(sa, mask);
426 break;
427 }
428 if (width < 0)
429 printf("%s", cp);
430 else {
431 if (nflag)
432 printf("%-*s ", width, cp);
433 else
434 printf("%-*.*s ", width, width, cp);
435 }
436 }
437
438 static char line[HOST_NAME_MAX+1];
439 static char domain[HOST_NAME_MAX+1];
440
441 void
p_sockaddr_mpls(struct sockaddr * in,struct sockaddr * out,int flags,int width)442 p_sockaddr_mpls(struct sockaddr *in, struct sockaddr *out, int flags, int width)
443 {
444 if (in->sa_family != AF_MPLS)
445 return;
446
447 if (flags & MPLS_OP_POP || flags == MPLS_OP_LOCAL) {
448 printf("%-*s ", width, label_print(in));
449 printf("%-*s ", width, label_print(NULL));
450 } else {
451 printf("%-*s ", width, label_print(in));
452 printf("%-*s ", width, label_print(out));
453 }
454
455 printf("%-6s ", mpls_op(flags));
456 }
457
458 void
p_flags(int f,char * format)459 p_flags(int f, char *format)
460 {
461 char name[33], *flags;
462 const struct bits *p = bits;
463
464 for (flags = name; p->b_mask && flags < &name[sizeof(name) - 2]; p++)
465 if (p->b_mask & f)
466 *flags++ = p->b_val;
467 *flags = '\0';
468 printf(format, name);
469 }
470
471 char *
routename(struct sockaddr * sa)472 routename(struct sockaddr *sa)
473 {
474 char *cp = NULL;
475 static int first = 1;
476
477 if (first) {
478 first = 0;
479 if (gethostname(domain, sizeof(domain)) == 0 &&
480 (cp = strchr(domain, '.')))
481 (void)strlcpy(domain, cp + 1, sizeof(domain));
482 else
483 domain[0] = '\0';
484 cp = NULL;
485 }
486
487 if (sa->sa_len == 0) {
488 (void)strlcpy(line, "default", sizeof(line));
489 return (line);
490 }
491
492 switch (sa->sa_family) {
493 case AF_INET:
494 return
495 (routename4(((struct sockaddr_in *)sa)->sin_addr.s_addr));
496
497 case AF_INET6:
498 {
499 struct sockaddr_in6 sin6;
500
501 memset(&sin6, 0, sizeof(sin6));
502 memcpy(&sin6, sa, sa->sa_len);
503 sin6.sin6_len = sizeof(struct sockaddr_in6);
504 sin6.sin6_family = AF_INET6;
505 #ifdef __KAME__
506 if (sa->sa_len == sizeof(struct sockaddr_in6) &&
507 (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
508 IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr) ||
509 IN6_IS_ADDR_MC_INTFACELOCAL(&sin6.sin6_addr)) &&
510 sin6.sin6_scope_id == 0) {
511 sin6.sin6_scope_id =
512 ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
513 sin6.sin6_addr.s6_addr[2] = 0;
514 sin6.sin6_addr.s6_addr[3] = 0;
515 }
516 #endif
517 return (routename6(&sin6));
518 }
519
520 case AF_LINK:
521 return (link_print(sa));
522 case AF_MPLS:
523 return (label_print(sa));
524 case AF_UNSPEC:
525 if (sa->sa_len == sizeof(struct sockaddr_rtlabel)) {
526 static char name[RTLABEL_LEN + 2];
527 struct sockaddr_rtlabel *sr;
528
529 sr = (struct sockaddr_rtlabel *)sa;
530 snprintf(name, sizeof(name), "\"%s\"", sr->sr_label);
531 return (name);
532 }
533 /* FALLTHROUGH */
534 default:
535 (void)snprintf(line, sizeof(line), "(%d) %s",
536 sa->sa_family, any_ntoa(sa));
537 break;
538 }
539 return (line);
540 }
541
542 char *
routename4(in_addr_t in)543 routename4(in_addr_t in)
544 {
545 char *cp = NULL;
546 struct in_addr ina;
547 struct hostent *hp;
548
549 if (!cp && !nflag) {
550 if ((hp = gethostbyaddr((char *)&in,
551 sizeof(in), AF_INET)) != NULL) {
552 if ((cp = strchr(hp->h_name, '.')) &&
553 !strcmp(cp + 1, domain))
554 *cp = '\0';
555 cp = hp->h_name;
556 }
557 }
558 ina.s_addr = in;
559 strlcpy(line, cp ? cp : inet_ntoa(ina), sizeof(line));
560
561 return (line);
562 }
563
564 char *
routename6(struct sockaddr_in6 * sin6)565 routename6(struct sockaddr_in6 *sin6)
566 {
567 int niflags = 0;
568
569 if (nflag)
570 niflags |= NI_NUMERICHOST;
571 else
572 niflags |= NI_NOFQDN;
573
574 if (getnameinfo((struct sockaddr *)sin6, sin6->sin6_len,
575 line, sizeof(line), NULL, 0, niflags) != 0)
576 strncpy(line, "invalid", sizeof(line));
577
578 return (line);
579 }
580
581 char *
netname4(in_addr_t in,struct sockaddr_in * maskp)582 netname4(in_addr_t in, struct sockaddr_in *maskp)
583 {
584 char *cp = NULL;
585 struct hostent *hp;
586 in_addr_t mask;
587 int mbits;
588
589 mask = maskp && maskp->sin_len != 0 ? ntohl(maskp->sin_addr.s_addr) : 0;
590 if (!nflag && in != INADDR_ANY) {
591 if ((hp = gethostbyaddr((char *)&in,
592 sizeof(in), AF_INET)) != NULL)
593 cp = hp->h_name;
594 }
595 if (in == INADDR_ANY && mask == INADDR_ANY)
596 cp = "default";
597 mbits = mask ? 33 - ffs(mask) : 0;
598 in = ntohl(in);
599 if (cp)
600 strlcpy(line, cp, sizeof(line));
601 #define C(x) ((x) & 0xff)
602 else if (mbits < 9)
603 snprintf(line, sizeof(line), "%u/%d", C(in >> 24), mbits);
604 else if (mbits < 17)
605 snprintf(line, sizeof(line), "%u.%u/%d",
606 C(in >> 24) , C(in >> 16), mbits);
607 else if (mbits < 25)
608 snprintf(line, sizeof(line), "%u.%u.%u/%d",
609 C(in >> 24), C(in >> 16), C(in >> 8), mbits);
610 else
611 snprintf(line, sizeof(line), "%u.%u.%u.%u/%d", C(in >> 24),
612 C(in >> 16), C(in >> 8), C(in), mbits);
613 #undef C
614 return (line);
615 }
616
617 char *
netname6(struct sockaddr_in6 * sa6,struct sockaddr_in6 * mask)618 netname6(struct sockaddr_in6 *sa6, struct sockaddr_in6 *mask)
619 {
620 struct sockaddr_in6 sin6;
621 u_char *p;
622 int masklen, final = 0, illegal = 0;
623 int i, lim, flag, error;
624 char hbuf[NI_MAXHOST];
625
626 sin6 = *sa6;
627
628 flag = 0;
629 masklen = 0;
630 if (mask) {
631 lim = mask->sin6_len - offsetof(struct sockaddr_in6, sin6_addr);
632 lim = lim < (int)sizeof(struct in6_addr) ?
633 lim : (int)sizeof(struct in6_addr);
634 for (p = (u_char *)&mask->sin6_addr, i = 0; i < lim; p++) {
635 if (final && *p) {
636 illegal++;
637 sin6.sin6_addr.s6_addr[i++] = 0x00;
638 continue;
639 }
640
641 switch (*p & 0xff) {
642 case 0xff:
643 masklen += 8;
644 break;
645 case 0xfe:
646 masklen += 7;
647 final++;
648 break;
649 case 0xfc:
650 masklen += 6;
651 final++;
652 break;
653 case 0xf8:
654 masklen += 5;
655 final++;
656 break;
657 case 0xf0:
658 masklen += 4;
659 final++;
660 break;
661 case 0xe0:
662 masklen += 3;
663 final++;
664 break;
665 case 0xc0:
666 masklen += 2;
667 final++;
668 break;
669 case 0x80:
670 masklen += 1;
671 final++;
672 break;
673 case 0x00:
674 final++;
675 break;
676 default:
677 final++;
678 illegal++;
679 break;
680 }
681
682 if (!illegal)
683 sin6.sin6_addr.s6_addr[i++] &= *p;
684 else
685 sin6.sin6_addr.s6_addr[i++] = 0x00;
686 }
687 while (i < (int)sizeof(struct in6_addr))
688 sin6.sin6_addr.s6_addr[i++] = 0x00;
689 } else
690 masklen = 128;
691
692 if (masklen == 0 && IN6_IS_ADDR_UNSPECIFIED(&sin6.sin6_addr))
693 return ("default");
694
695 if (illegal)
696 warnx("illegal prefixlen");
697
698 if (nflag)
699 flag |= NI_NUMERICHOST;
700 error = getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
701 hbuf, sizeof(hbuf), NULL, 0, flag);
702 if (error)
703 snprintf(hbuf, sizeof(hbuf), "invalid");
704
705 snprintf(line, sizeof(line), "%s/%d", hbuf, masklen);
706 return (line);
707 }
708
709 /*
710 * Return the name of the network whose address is given.
711 * The address is assumed to be that of a net or subnet, not a host.
712 */
713 char *
netname(struct sockaddr * sa,struct sockaddr * mask)714 netname(struct sockaddr *sa, struct sockaddr *mask)
715 {
716 switch (sa->sa_family) {
717 case AF_INET:
718 return netname4(((struct sockaddr_in *)sa)->sin_addr.s_addr,
719 (struct sockaddr_in *)mask);
720 case AF_INET6:
721 return netname6((struct sockaddr_in6 *)sa,
722 (struct sockaddr_in6 *)mask);
723 case AF_LINK:
724 return (link_print(sa));
725 case AF_MPLS:
726 return (label_print(sa));
727 default:
728 snprintf(line, sizeof(line), "af %d: %s",
729 sa->sa_family, any_ntoa(sa));
730 break;
731 }
732 return (line);
733 }
734
735 static const char hexlist[] = "0123456789abcdef";
736
737 char *
any_ntoa(const struct sockaddr * sa)738 any_ntoa(const struct sockaddr *sa)
739 {
740 static char obuf[240];
741 const char *in = sa->sa_data;
742 char *out = obuf;
743 int len = sa->sa_len - offsetof(struct sockaddr, sa_data);
744
745 *out++ = 'Q';
746 do {
747 *out++ = hexlist[(*in >> 4) & 15];
748 *out++ = hexlist[(*in++) & 15];
749 *out++ = '.';
750 } while (--len > 0 && (out + 3) < &obuf[sizeof(obuf) - 1]);
751 out[-1] = '\0';
752 return (obuf);
753 }
754
755 char *
link_print(struct sockaddr * sa)756 link_print(struct sockaddr *sa)
757 {
758 struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
759 u_char *lla = (u_char *)sdl->sdl_data + sdl->sdl_nlen;
760
761 if (sdl->sdl_nlen == 0 && sdl->sdl_alen == 0 &&
762 sdl->sdl_slen == 0) {
763 (void)snprintf(line, sizeof(line), "link#%d", sdl->sdl_index);
764 return (line);
765 }
766 switch (sdl->sdl_type) {
767 case IFT_ETHER:
768 case IFT_CARP:
769 return (ether_ntoa((struct ether_addr *)lla));
770 default:
771 return (link_ntoa(sdl));
772 }
773 }
774
775 char *
mpls_op(u_int32_t type)776 mpls_op(u_int32_t type)
777 {
778 switch (type & (MPLS_OP_PUSH | MPLS_OP_POP | MPLS_OP_SWAP)) {
779 case MPLS_OP_LOCAL:
780 return ("LOCAL");
781 case MPLS_OP_POP:
782 return ("POP");
783 case MPLS_OP_SWAP:
784 return ("SWAP");
785 case MPLS_OP_PUSH:
786 return ("PUSH");
787 default:
788 return ("?");
789 }
790 }
791
792 char *
label_print(struct sockaddr * sa)793 label_print(struct sockaddr *sa)
794 {
795 struct sockaddr_mpls *smpls = (struct sockaddr_mpls *)sa;
796
797 if (smpls)
798 (void)snprintf(line, sizeof(line), "%u",
799 ntohl(smpls->smpls_label) >> MPLS_LABEL_OFFSET);
800 else
801 (void)snprintf(line, sizeof(line), "-");
802
803 return (line);
804 }
805