1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1983, 1989, 1991, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 * may be used to endorse or promote products derived from this software
17 * without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1983, 1989, 1991, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #ifndef lint
39 #if 0
40 static char sccsid[] = "@(#)route.c 8.6 (Berkeley) 4/28/95";
41 #endif
42 #endif /* not lint */
43
44 #include <sys/cdefs.h>
45 #include <sys/param.h>
46 #include <sys/file.h>
47 #include <sys/socket.h>
48 #include <sys/ioctl.h>
49 #ifdef JAIL
50 #include <sys/jail.h>
51 #endif
52 #include <sys/sysctl.h>
53 #include <sys/types.h>
54 #include <sys/queue.h>
55
56 #include <net/if.h>
57 #include <net/route.h>
58 #include <net/if_dl.h>
59 #include <netinet/in.h>
60 #include <netinet/if_ether.h>
61 #include <arpa/inet.h>
62 #include <netdb.h>
63
64 #include <ctype.h>
65 #include <err.h>
66 #include <errno.h>
67 #ifdef JAIL
68 #include <jail.h>
69 #endif
70 #include <paths.h>
71 #include <signal.h>
72 #include <stdbool.h>
73 #include <stdio.h>
74 #include <stdlib.h>
75 #include <string.h>
76 #include <sysexits.h>
77 #include <time.h>
78 #include <unistd.h>
79 #include <ifaddrs.h>
80
81 struct fibl {
82 TAILQ_ENTRY(fibl) fl_next;
83
84 int fl_num;
85 int fl_error;
86 int fl_errno;
87 };
88
89 static struct keytab {
90 const char *kt_cp;
91 int kt_i;
92 } const keywords[] = {
93 #include "keywords.h"
94 {0, 0}
95 };
96
97 int verbose, debugonly;
98 #ifdef JAIL
99 char * jail_name;
100 #endif
101 static struct sockaddr_storage so[RTAX_MAX];
102 static int pid, rtm_addrs;
103 static int nflag, af, aflen, qflag, tflag;
104 static int locking, lockrest;
105 static struct rt_metrics rt_metrics;
106 static u_long rtm_inits;
107 static uid_t uid;
108 static int defaultfib;
109 static int numfibs;
110 static char domain_storage[MAXHOSTNAMELEN + 1];
111 static const char *domain;
112 static char rt_line[NI_MAXHOST];
113 static char net_line[MAXHOSTNAMELEN + 1];
114
115 #ifdef WITHOUT_NETLINK
116 static int s;
117 static int rtm_seq;
118
119 static struct {
120 struct rt_msghdr m_rtm;
121 char m_space[512];
122 } m_rtmsg;
123
124 static int rtmsg_rtsock(int, int, int);
125 static int flushroutes_fib_rtsock(int);
126 static void monitor_rtsock(void);
127 #else
128 int rtmsg_nl(int, int, int, int, struct sockaddr_storage *, struct rt_metrics *);
129 int flushroutes_fib_nl(int, int);
130 void monitor_nl(int);
131 #endif
132
133 static TAILQ_HEAD(fibl_head_t, fibl) fibl_head;
134
135 void printb(int, const char *);
136 static void flushroutes(int argc, char *argv[]);
137 static int flushroutes_fib(int);
138 static int getaddr(int, char *, int);
139 static int keyword(const char *);
140 #ifdef INET
141 static void inet_makemask(struct sockaddr_in *, u_long);
142 #endif
143 #ifdef INET6
144 static int inet6_makenetandmask(struct sockaddr_in6 *, const char *);
145 #endif
146 static void interfaces(void);
147 static void monitor(int, char*[]);
148 const char *netname(struct sockaddr *);
149 static void newroute(int, char **);
150 static int newroute_fib(int, char *, int);
151 static void pmsg_addrs(char *, int, size_t);
152 static void pmsg_common(struct rt_msghdr *, size_t);
153 static int prefixlen(const char *);
154 static void print_getmsg(struct rt_msghdr *, int, int);
155 static void print_rtmsg(struct rt_msghdr *, size_t);
156 const char *routename(struct sockaddr *);
157 static int rtmsg(int, int, int);
158 static void set_metric(char *, int);
159 static int set_sofib(int);
160 static void sockaddr(char *, struct sockaddr *, size_t);
161 static void sodump(struct sockaddr *, const char *);
162 static int fiboptlist_csv(const char *, struct fibl_head_t *);
163 static int fiboptlist_range(const char *, struct fibl_head_t *);
164
165 static void usage(const char *) __dead2;
166
167 #define READ_TIMEOUT 10
168 static volatile sig_atomic_t stop_read;
169
170 static void
stopit(int sig __unused)171 stopit(int sig __unused)
172 {
173
174 stop_read = 1;
175 }
176
177 static void
usage(const char * cp)178 usage(const char *cp)
179 {
180 if (cp != NULL)
181 warnx("bad keyword: %s", cp);
182 errx(EX_USAGE, "usage: route [-j jail] [-46dnqtv] command [[modifiers] args]");
183 /* NOTREACHED */
184 }
185
186 int
main(int argc,char ** argv)187 main(int argc, char **argv)
188 {
189 int ch;
190 #ifdef JAIL
191 int jid;
192 #endif
193 size_t len;
194
195 if (argc < 2)
196 usage(NULL);
197
198 while ((ch = getopt(argc, argv, "46nqdtvj:")) != -1)
199 switch(ch) {
200 case '4':
201 #ifdef INET
202 af = AF_INET;
203 aflen = sizeof(struct sockaddr_in);
204 #else
205 errx(1, "IPv4 support is not compiled in");
206 #endif
207 break;
208 case '6':
209 #ifdef INET6
210 af = AF_INET6;
211 aflen = sizeof(struct sockaddr_in6);
212 #else
213 errx(1, "IPv6 support is not compiled in");
214 #endif
215 break;
216 case 'n':
217 nflag = 1;
218 break;
219 case 'q':
220 qflag = 1;
221 break;
222 case 'v':
223 verbose = 1;
224 break;
225 case 't':
226 tflag = 1;
227 break;
228 case 'd':
229 debugonly = 1;
230 break;
231 case 'j':
232 #ifdef JAIL
233 if (optarg == NULL)
234 usage(NULL);
235 jail_name = optarg;
236 #else
237 errx(1, "Jail support is not compiled in");
238 #endif
239 break;
240 case '?':
241 default:
242 usage(NULL);
243 }
244 argc -= optind;
245 argv += optind;
246
247 pid = getpid();
248 uid = geteuid();
249
250 #ifdef JAIL
251 if (jail_name != NULL) {
252 jid = jail_getid(jail_name);
253 if (jid == -1)
254 errx(1, "Jail not found");
255 if (jail_attach(jid) != 0)
256 errx(1, "Cannot attach to jail");
257 }
258 #endif
259
260 #ifdef WITHOUT_NETLINK
261 if (tflag)
262 s = open(_PATH_DEVNULL, O_WRONLY, 0);
263 else
264 s = socket(PF_ROUTE, SOCK_RAW, 0);
265 if (s < 0)
266 err(EX_OSERR, "socket");
267 #endif
268
269 len = sizeof(numfibs);
270 if (sysctlbyname("net.fibs", (void *)&numfibs, &len, NULL, 0) == -1)
271 numfibs = -1;
272
273 len = sizeof(defaultfib);
274 if (numfibs != -1 &&
275 sysctlbyname("net.my_fibnum", (void *)&defaultfib, &len, NULL,
276 0) == -1)
277 defaultfib = -1;
278
279 if (*argv != NULL)
280 switch (keyword(*argv)) {
281 case K_GET:
282 case K_SHOW:
283 uid = 0;
284 /* FALLTHROUGH */
285
286 case K_CHANGE:
287 case K_ADD:
288 case K_DEL:
289 case K_DELETE:
290 newroute(argc, argv);
291 /* NOTREACHED */
292
293 case K_MONITOR:
294 monitor(argc, argv);
295 /* NOTREACHED */
296
297 case K_FLUSH:
298 flushroutes(argc, argv);
299 exit(0);
300 /* NOTREACHED */
301 }
302 usage(*argv);
303 /* NOTREACHED */
304 }
305
306 static int
set_sofib(int fib)307 set_sofib(int fib)
308 {
309
310 #ifdef WITHOUT_NETLINK
311 if (fib < 0)
312 return (0);
313 return (setsockopt(s, SOL_SOCKET, SO_SETFIB, (void *)&fib,
314 sizeof(fib)));
315 #else
316 return (0);
317 #endif
318 }
319
320 static int
fiboptlist_range(const char * arg,struct fibl_head_t * flh)321 fiboptlist_range(const char *arg, struct fibl_head_t *flh)
322 {
323 struct fibl *fl;
324 char *str0, *str, *token, *endptr;
325 int fib[2], i, error;
326
327 str0 = str = strdup(arg);
328 error = 0;
329 i = 0;
330 while ((token = strsep(&str, "-")) != NULL) {
331 switch (i) {
332 case 0:
333 case 1:
334 errno = 0;
335 fib[i] = strtol(token, &endptr, 0);
336 if (errno == 0) {
337 if (*endptr != '\0' ||
338 fib[i] < 0 ||
339 (numfibs != -1 && fib[i] > numfibs - 1))
340 errno = EINVAL;
341 }
342 if (errno)
343 error = 1;
344 break;
345 default:
346 error = 1;
347 }
348 if (error)
349 goto fiboptlist_range_ret;
350 i++;
351 }
352 if (fib[0] >= fib[1]) {
353 error = 1;
354 goto fiboptlist_range_ret;
355 }
356 for (i = fib[0]; i <= fib[1]; i++) {
357 fl = calloc(1, sizeof(*fl));
358 if (fl == NULL) {
359 error = 1;
360 goto fiboptlist_range_ret;
361 }
362 fl->fl_num = i;
363 TAILQ_INSERT_TAIL(flh, fl, fl_next);
364 }
365 fiboptlist_range_ret:
366 free(str0);
367 return (error);
368 }
369
370 #define ALLSTRLEN 64
371 static int
fiboptlist_csv(const char * arg,struct fibl_head_t * flh)372 fiboptlist_csv(const char *arg, struct fibl_head_t *flh)
373 {
374 struct fibl *fl;
375 char *str0, *str, *token, *endptr;
376 int fib, error;
377
378 str0 = str = NULL;
379 if (strcmp("all", arg) == 0) {
380 str = calloc(1, ALLSTRLEN);
381 if (str == NULL) {
382 error = 1;
383 goto fiboptlist_csv_ret;
384 }
385 if (numfibs > 1)
386 snprintf(str, ALLSTRLEN - 1, "%d-%d", 0, numfibs - 1);
387 else
388 snprintf(str, ALLSTRLEN - 1, "%d", 0);
389 } else if (strcmp("default", arg) == 0) {
390 str0 = str = calloc(1, ALLSTRLEN);
391 if (str == NULL) {
392 error = 1;
393 goto fiboptlist_csv_ret;
394 }
395 snprintf(str, ALLSTRLEN - 1, "%d", defaultfib);
396 } else
397 str0 = str = strdup(arg);
398
399 error = 0;
400 while ((token = strsep(&str, ",")) != NULL) {
401 if (*token != '-' && strchr(token, '-') != NULL) {
402 error = fiboptlist_range(token, flh);
403 if (error)
404 goto fiboptlist_csv_ret;
405 } else {
406 errno = 0;
407 fib = strtol(token, &endptr, 0);
408 if (errno == 0) {
409 if (*endptr != '\0' ||
410 fib < 0 ||
411 (numfibs != -1 && fib > numfibs - 1))
412 errno = EINVAL;
413 }
414 if (errno) {
415 error = 1;
416 goto fiboptlist_csv_ret;
417 }
418 fl = calloc(1, sizeof(*fl));
419 if (fl == NULL) {
420 error = 1;
421 goto fiboptlist_csv_ret;
422 }
423 fl->fl_num = fib;
424 TAILQ_INSERT_TAIL(flh, fl, fl_next);
425 }
426 }
427 fiboptlist_csv_ret:
428 if (str0 != NULL)
429 free(str0);
430 return (error);
431 }
432
433 /*
434 * Purge all entries in the routing tables not
435 * associated with network interfaces.
436 */
437 static void
flushroutes(int argc,char * argv[])438 flushroutes(int argc, char *argv[])
439 {
440 struct fibl *fl;
441 int error;
442
443 if (uid != 0 && !debugonly && !tflag)
444 errx(EX_NOPERM, "must be root to alter routing table");
445 #ifdef WITHOUT_NETLINK
446 shutdown(s, SHUT_RD); /* Don't want to read back our messages */
447 #endif
448
449 TAILQ_INIT(&fibl_head);
450 while (argc > 1) {
451 argc--;
452 argv++;
453 if (**argv != '-')
454 usage(*argv);
455 switch (keyword(*argv + 1)) {
456 #ifdef INET
457 case K_4:
458 case K_INET:
459 af = AF_INET;
460 break;
461 #endif
462 #ifdef INET6
463 case K_6:
464 case K_INET6:
465 af = AF_INET6;
466 break;
467 #endif
468 case K_LINK:
469 af = AF_LINK;
470 break;
471 case K_FIB:
472 if (!--argc)
473 usage(*argv);
474 error = fiboptlist_csv(*++argv, &fibl_head);
475 if (error)
476 errx(EX_USAGE, "invalid fib number: %s", *argv);
477 break;
478 default:
479 usage(*argv);
480 }
481 }
482 if (TAILQ_EMPTY(&fibl_head)) {
483 error = fiboptlist_csv("default", &fibl_head);
484 if (error)
485 errx(EX_OSERR, "fiboptlist_csv failed.");
486 }
487 TAILQ_FOREACH(fl, &fibl_head, fl_next)
488 flushroutes_fib(fl->fl_num);
489 }
490
491 static int
flushroutes_fib(int fib)492 flushroutes_fib(int fib)
493 {
494 #ifdef WITHOUT_NETLINK
495 return (flushroutes_fib_rtsock(fib));
496 #else
497 return (flushroutes_fib_nl(fib, af));
498 #endif
499 }
500
501 #ifdef WITHOUT_NETLINK
502 static int
flushroutes_fib_rtsock(int fib)503 flushroutes_fib_rtsock(int fib)
504 {
505 struct rt_msghdr *rtm;
506 size_t needed;
507 char *buf, *next, *lim;
508 int mib[7], rlen, seqno, count = 0;
509 int error;
510
511 error = set_sofib(fib);
512 if (error) {
513 warn("fib number %d is ignored", fib);
514 return (error);
515 }
516
517 retry:
518 mib[0] = CTL_NET;
519 mib[1] = PF_ROUTE;
520 mib[2] = 0; /* protocol */
521 mib[3] = AF_UNSPEC;
522 mib[4] = NET_RT_DUMP;
523 mib[5] = 0; /* no flags */
524 mib[6] = fib;
525 if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
526 err(EX_OSERR, "route-sysctl-estimate");
527 if ((buf = malloc(needed)) == NULL)
528 errx(EX_OSERR, "malloc failed");
529 if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) {
530 if (errno == ENOMEM && count++ < 10) {
531 warnx("Routing table grew, retrying");
532 sleep(1);
533 free(buf);
534 goto retry;
535 }
536 err(EX_OSERR, "route-sysctl-get");
537 }
538 lim = buf + needed;
539 if (verbose)
540 (void)printf("Examining routing table from sysctl\n");
541 seqno = 0; /* ??? */
542 for (next = buf; next < lim; next += rtm->rtm_msglen) {
543 rtm = (struct rt_msghdr *)(void *)next;
544 if (verbose)
545 print_rtmsg(rtm, rtm->rtm_msglen);
546 if ((rtm->rtm_flags & RTF_GATEWAY) == 0)
547 continue;
548 if (af != 0) {
549 struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
550
551 if (sa->sa_family != af)
552 continue;
553 }
554 if (debugonly)
555 continue;
556 rtm->rtm_type = RTM_DELETE;
557 rtm->rtm_seq = seqno;
558 rlen = write(s, next, rtm->rtm_msglen);
559 if (rlen < 0 && errno == EPERM)
560 err(1, "write to routing socket");
561 if (rlen < (int)rtm->rtm_msglen) {
562 warn("write to routing socket");
563 (void)printf("got only %d for rlen\n", rlen);
564 free(buf);
565 goto retry;
566 break;
567 }
568 seqno++;
569 if (qflag)
570 continue;
571 if (verbose)
572 print_rtmsg(rtm, rlen);
573 else {
574 struct sockaddr *sa = (struct sockaddr *)(rtm + 1);
575
576 printf("%-20.20s ", rtm->rtm_flags & RTF_HOST ?
577 routename(sa) : netname(sa));
578 sa = (struct sockaddr *)(SA_SIZE(sa) + (char *)sa);
579 printf("%-20.20s ", routename(sa));
580 if (fib >= 0)
581 printf("-fib %-3d ", fib);
582 printf("done\n");
583 }
584 }
585 free(buf);
586 return (error);
587 }
588 #endif
589
590 const char *
routename(struct sockaddr * sa)591 routename(struct sockaddr *sa)
592 {
593 struct sockaddr_dl *sdl;
594 const char *cp;
595 int n;
596
597 if (domain == NULL) {
598 if (gethostname(domain_storage,
599 sizeof(domain_storage) - 1) == 0 &&
600 (cp = strchr(domain_storage, '.')) != NULL) {
601 domain_storage[sizeof(domain_storage) - 1] = '\0';
602 domain = cp + 1;
603 } else {
604 domain_storage[0] = '\0';
605 domain = domain_storage;
606 }
607 }
608
609 /* If the address is zero-filled, use "default". */
610 if (sa->sa_len == 0 && nflag == 0)
611 return ("default");
612 #if defined(INET) || defined(INET6)
613 switch (sa->sa_family) {
614 #ifdef INET
615 case AF_INET:
616 /* If the address is zero-filled, use "default". */
617 if (nflag == 0 &&
618 ((struct sockaddr_in *)(void *)sa)->sin_addr.s_addr ==
619 INADDR_ANY)
620 return("default");
621 break;
622 #endif
623 #ifdef INET6
624 case AF_INET6:
625 /* If the address is zero-filled, use "default". */
626 if (nflag == 0 &&
627 IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *)(void *)sa)->sin6_addr))
628 return("default");
629 break;
630 #endif
631 }
632 #endif
633
634 switch (sa->sa_family) {
635 #if defined(INET) || defined(INET6)
636 #ifdef INET
637 case AF_INET:
638 #endif
639 #ifdef INET6
640 case AF_INET6:
641 #endif
642 {
643 struct sockaddr_storage ss;
644 int error;
645 char *p;
646
647 memset(&ss, 0, sizeof(ss));
648 if (sa->sa_len == 0)
649 ss.ss_family = sa->sa_family;
650 else
651 memcpy(&ss, sa, sa->sa_len);
652 /* Expand sa->sa_len because it could be shortened. */
653 if (sa->sa_family == AF_INET)
654 ss.ss_len = sizeof(struct sockaddr_in);
655 else if (sa->sa_family == AF_INET6)
656 ss.ss_len = sizeof(struct sockaddr_in6);
657 error = getnameinfo((struct sockaddr *)&ss, ss.ss_len,
658 rt_line, sizeof(rt_line), NULL, 0,
659 (nflag == 0) ? 0 : NI_NUMERICHOST);
660 if (error) {
661 warnx("getnameinfo(): %s", gai_strerror(error));
662 strncpy(rt_line, "invalid", sizeof(rt_line));
663 }
664
665 /* Remove the domain part if any. */
666 p = strchr(rt_line, '.');
667 if (p != NULL && strcmp(p + 1, domain) == 0)
668 *p = '\0';
669
670 return (rt_line);
671 break;
672 }
673 #endif
674 case AF_LINK:
675 sdl = (struct sockaddr_dl *)(void *)sa;
676
677 if (sdl->sdl_nlen == 0 &&
678 sdl->sdl_alen == 0 &&
679 sdl->sdl_slen == 0) {
680 n = snprintf(rt_line, sizeof(rt_line), "link#%d",
681 sdl->sdl_index);
682 if (n > (int)sizeof(rt_line))
683 rt_line[0] = '\0';
684 return (rt_line);
685 } else
686 return (link_ntoa(sdl));
687 break;
688
689 default:
690 {
691 u_short *sp = (u_short *)(void *)sa;
692 u_short *splim = sp + ((sa->sa_len + 1) >> 1);
693 char *cps = rt_line + sprintf(rt_line, "(%d)", sa->sa_family);
694 char *cpe = rt_line + sizeof(rt_line);
695
696 while (++sp < splim && cps < cpe) /* start with sa->sa_data */
697 if ((n = snprintf(cps, cpe - cps, " %x", *sp)) > 0)
698 cps += n;
699 else
700 *cps = '\0';
701 break;
702 }
703 }
704 return (rt_line);
705 }
706
707 /*
708 * Return the name of the network whose address is given.
709 * The address is assumed to be that of a net, not a host.
710 */
711 const char *
netname(struct sockaddr * sa)712 netname(struct sockaddr *sa)
713 {
714 struct sockaddr_dl *sdl;
715 int n;
716 #ifdef INET
717 struct netent *np = NULL;
718 const char *cp = NULL;
719 u_long i;
720 #endif
721
722 switch (sa->sa_family) {
723 #ifdef INET
724 case AF_INET:
725 {
726 struct in_addr in;
727
728 in = ((struct sockaddr_in *)(void *)sa)->sin_addr;
729 i = in.s_addr = ntohl(in.s_addr);
730 if (in.s_addr == 0)
731 cp = "default";
732 else if (!nflag) {
733 np = getnetbyaddr(i, AF_INET);
734 if (np != NULL)
735 cp = np->n_name;
736 }
737 #define C(x) (unsigned)((x) & 0xff)
738 if (cp != NULL)
739 strncpy(net_line, cp, sizeof(net_line));
740 else if ((in.s_addr & 0xffffff) == 0)
741 (void)sprintf(net_line, "%u", C(in.s_addr >> 24));
742 else if ((in.s_addr & 0xffff) == 0)
743 (void)sprintf(net_line, "%u.%u", C(in.s_addr >> 24),
744 C(in.s_addr >> 16));
745 else if ((in.s_addr & 0xff) == 0)
746 (void)sprintf(net_line, "%u.%u.%u", C(in.s_addr >> 24),
747 C(in.s_addr >> 16), C(in.s_addr >> 8));
748 else
749 (void)sprintf(net_line, "%u.%u.%u.%u", C(in.s_addr >> 24),
750 C(in.s_addr >> 16), C(in.s_addr >> 8),
751 C(in.s_addr));
752 #undef C
753 break;
754 }
755 #endif
756 #ifdef INET6
757 case AF_INET6:
758 {
759 struct sockaddr_in6 sin6;
760 int niflags = 0;
761
762 memset(&sin6, 0, sizeof(sin6));
763 memcpy(&sin6, sa, sa->sa_len);
764 sin6.sin6_len = sizeof(sin6);
765 sin6.sin6_family = AF_INET6;
766 if (nflag)
767 niflags |= NI_NUMERICHOST;
768 if (getnameinfo((struct sockaddr *)&sin6, sin6.sin6_len,
769 net_line, sizeof(net_line), NULL, 0, niflags) != 0)
770 strncpy(net_line, "invalid", sizeof(net_line));
771
772 return(net_line);
773 }
774 #endif
775 case AF_LINK:
776 sdl = (struct sockaddr_dl *)(void *)sa;
777
778 if (sdl->sdl_nlen == 0 &&
779 sdl->sdl_alen == 0 &&
780 sdl->sdl_slen == 0) {
781 n = snprintf(net_line, sizeof(net_line), "link#%d",
782 sdl->sdl_index);
783 if (n > (int)sizeof(net_line))
784 net_line[0] = '\0';
785 return (net_line);
786 } else
787 return (link_ntoa(sdl));
788 break;
789
790 default:
791 {
792 u_short *sp = (u_short *)(void *)sa->sa_data;
793 u_short *splim = sp + ((sa->sa_len + 1)>>1);
794 char *cps = net_line + sprintf(net_line, "af %d:", sa->sa_family);
795 char *cpe = net_line + sizeof(net_line);
796
797 while (sp < splim && cps < cpe)
798 if ((n = snprintf(cps, cpe - cps, " %x", *sp++)) > 0)
799 cps += n;
800 else
801 *cps = '\0';
802 break;
803 }
804 }
805 return (net_line);
806 }
807
808 static void
set_metric(char * value,int key)809 set_metric(char *value, int key)
810 {
811 int flag = 0;
812 char *endptr;
813 u_long noval, *valp = &noval;
814
815 switch (key) {
816 #define caseof(x, y, z) case x: valp = &rt_metrics.z; flag = y; break
817 caseof(K_MTU, RTV_MTU, rmx_mtu);
818 caseof(K_HOPCOUNT, RTV_HOPCOUNT, rmx_hopcount);
819 caseof(K_EXPIRE, RTV_EXPIRE, rmx_expire);
820 caseof(K_RECVPIPE, RTV_RPIPE, rmx_recvpipe);
821 caseof(K_SENDPIPE, RTV_SPIPE, rmx_sendpipe);
822 caseof(K_SSTHRESH, RTV_SSTHRESH, rmx_ssthresh);
823 caseof(K_RTT, RTV_RTT, rmx_rtt);
824 caseof(K_RTTVAR, RTV_RTTVAR, rmx_rttvar);
825 caseof(K_WEIGHT, RTV_WEIGHT, rmx_weight);
826 }
827 rtm_inits |= flag;
828 if (lockrest || locking)
829 rt_metrics.rmx_locks |= flag;
830 if (locking)
831 locking = 0;
832 errno = 0;
833 *valp = strtol(value, &endptr, 0);
834 if (errno == 0 && *endptr != '\0')
835 errno = EINVAL;
836 if (errno)
837 err(EX_USAGE, "%s", value);
838 if (flag & RTV_EXPIRE && (value[0] == '+' || value[0] == '-')) {
839 struct timespec ts;
840
841 clock_gettime(CLOCK_REALTIME_FAST, &ts);
842 *valp += ts.tv_sec;
843 }
844 }
845
846 #define F_ISHOST 0x01
847 #define F_FORCENET 0x02
848 #define F_FORCEHOST 0x04
849 #define F_PROXY 0x08
850 #define F_INTERFACE 0x10
851
852 static void
newroute(int argc,char ** argv)853 newroute(int argc, char **argv)
854 {
855 struct sigaction sa;
856 struct fibl *fl;
857 char *cmd;
858 const char *dest, *gateway, *errmsg;
859 int key, error, flags, nrflags, fibnum;
860
861 if (uid != 0 && !debugonly && !tflag)
862 errx(EX_NOPERM, "must be root to alter routing table");
863 dest = NULL;
864 gateway = NULL;
865 flags = RTF_STATIC;
866 nrflags = 0;
867 TAILQ_INIT(&fibl_head);
868
869 sigemptyset(&sa.sa_mask);
870 sa.sa_flags = 0;
871 sa.sa_handler = stopit;
872 if (sigaction(SIGALRM, &sa, 0) == -1)
873 warn("sigaction SIGALRM");
874
875 cmd = argv[0];
876 #ifdef WITHOUT_NETLINK
877 if (*cmd != 'g' && *cmd != 's')
878 shutdown(s, SHUT_RD); /* Don't want to read back our messages */
879 #endif
880 while (--argc > 0) {
881 if (**(++argv)== '-') {
882 switch (key = keyword(1 + *argv)) {
883 case K_LINK:
884 af = AF_LINK;
885 aflen = sizeof(struct sockaddr_dl);
886 break;
887 #ifdef INET
888 case K_4:
889 case K_INET:
890 af = AF_INET;
891 aflen = sizeof(struct sockaddr_in);
892 break;
893 #endif
894 #ifdef INET6
895 case K_6:
896 case K_INET6:
897 af = AF_INET6;
898 aflen = sizeof(struct sockaddr_in6);
899 break;
900 #endif
901 case K_SA:
902 af = PF_ROUTE;
903 aflen = sizeof(struct sockaddr_storage);
904 break;
905 case K_IFACE:
906 case K_INTERFACE:
907 nrflags |= F_INTERFACE;
908 break;
909 case K_NOSTATIC:
910 flags &= ~RTF_STATIC;
911 break;
912 case K_LOCK:
913 locking = 1;
914 break;
915 case K_LOCKREST:
916 lockrest = 1;
917 break;
918 case K_HOST:
919 nrflags |= F_FORCEHOST;
920 break;
921 case K_REJECT:
922 flags |= RTF_REJECT;
923 break;
924 case K_BLACKHOLE:
925 flags |= RTF_BLACKHOLE;
926 break;
927 case K_PROTO1:
928 flags |= RTF_PROTO1;
929 break;
930 case K_PROTO2:
931 flags |= RTF_PROTO2;
932 break;
933 case K_PROXY:
934 nrflags |= F_PROXY;
935 break;
936 case K_XRESOLVE:
937 flags |= RTF_XRESOLVE;
938 break;
939 case K_STATIC:
940 flags |= RTF_STATIC;
941 break;
942 case K_STICKY:
943 flags |= RTF_STICKY;
944 break;
945 case K_NOSTICK:
946 flags &= ~RTF_STICKY;
947 break;
948 case K_FIB:
949 if (!--argc)
950 usage(NULL);
951 error = fiboptlist_csv(*++argv, &fibl_head);
952 if (error)
953 errx(EX_USAGE,
954 "invalid fib number: %s", *argv);
955 break;
956 case K_IFA:
957 if (!--argc)
958 usage(NULL);
959 getaddr(RTAX_IFA, *++argv, nrflags);
960 break;
961 case K_IFP:
962 if (!--argc)
963 usage(NULL);
964 getaddr(RTAX_IFP, *++argv, nrflags);
965 break;
966 case K_GENMASK:
967 if (!--argc)
968 usage(NULL);
969 getaddr(RTAX_GENMASK, *++argv, nrflags);
970 break;
971 case K_GATEWAY:
972 if (!--argc)
973 usage(NULL);
974 getaddr(RTAX_GATEWAY, *++argv, nrflags);
975 gateway = *argv;
976 break;
977 case K_DST:
978 if (!--argc)
979 usage(NULL);
980 if (getaddr(RTAX_DST, *++argv, nrflags))
981 nrflags |= F_ISHOST;
982 dest = *argv;
983 break;
984 case K_NETMASK:
985 if (!--argc)
986 usage(NULL);
987 getaddr(RTAX_NETMASK, *++argv, nrflags);
988 /* FALLTHROUGH */
989 case K_NET:
990 nrflags |= F_FORCENET;
991 break;
992 case K_PREFIXLEN:
993 if (!--argc)
994 usage(NULL);
995 if (prefixlen(*++argv) == -1) {
996 nrflags &= ~F_FORCENET;
997 nrflags |= F_ISHOST;
998 } else {
999 nrflags |= F_FORCENET;
1000 nrflags &= ~F_ISHOST;
1001 }
1002 break;
1003 case K_MTU:
1004 case K_HOPCOUNT:
1005 case K_EXPIRE:
1006 case K_RECVPIPE:
1007 case K_SENDPIPE:
1008 case K_SSTHRESH:
1009 case K_RTT:
1010 case K_RTTVAR:
1011 case K_WEIGHT:
1012 if (!--argc)
1013 usage(NULL);
1014 set_metric(*++argv, key);
1015 break;
1016 default:
1017 usage(1+*argv);
1018 }
1019 } else {
1020 if ((rtm_addrs & RTA_DST) == 0) {
1021 dest = *argv;
1022 if (getaddr(RTAX_DST, *argv, nrflags))
1023 nrflags |= F_ISHOST;
1024 } else if ((rtm_addrs & RTA_GATEWAY) == 0) {
1025 gateway = *argv;
1026 getaddr(RTAX_GATEWAY, *argv, nrflags);
1027 } else {
1028 getaddr(RTAX_NETMASK, *argv, nrflags);
1029 nrflags |= F_FORCENET;
1030 }
1031 }
1032 }
1033
1034 /* Do some sanity checks on resulting request */
1035 if (so[RTAX_DST].ss_len == 0) {
1036 warnx("destination parameter required");
1037 usage(NULL);
1038 }
1039
1040 if (so[RTAX_NETMASK].ss_len != 0 &&
1041 so[RTAX_DST].ss_family != so[RTAX_NETMASK].ss_family) {
1042 warnx("destination and netmask family need to be the same");
1043 usage(NULL);
1044 }
1045
1046 if (nrflags & F_FORCEHOST) {
1047 nrflags |= F_ISHOST;
1048 #ifdef INET6
1049 if (af == AF_INET6) {
1050 rtm_addrs &= ~RTA_NETMASK;
1051 memset(&so[RTAX_NETMASK], 0, sizeof(so[RTAX_NETMASK]));
1052 }
1053 #endif
1054 }
1055 if (nrflags & F_FORCENET)
1056 nrflags &= ~F_ISHOST;
1057 flags |= RTF_UP;
1058 if (nrflags & F_ISHOST)
1059 flags |= RTF_HOST;
1060 if ((nrflags & F_INTERFACE) == 0)
1061 flags |= RTF_GATEWAY;
1062 if (nrflags & F_PROXY)
1063 flags |= RTF_ANNOUNCE;
1064 if (dest == NULL)
1065 dest = "";
1066 if (gateway == NULL)
1067 gateway = "";
1068
1069 if (TAILQ_EMPTY(&fibl_head)) {
1070 error = fiboptlist_csv("default", &fibl_head);
1071 if (error)
1072 errx(EX_OSERR, "fiboptlist_csv failed.");
1073 }
1074 error = 0;
1075 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1076 fl->fl_error = newroute_fib(fl->fl_num, cmd, flags);
1077 if (fl->fl_error)
1078 fl->fl_errno = errno;
1079 error += fl->fl_error;
1080 }
1081 if (*cmd == 'g' || *cmd == 's')
1082 exit(error);
1083
1084 error = 0;
1085 if (!qflag) {
1086 fibnum = 0;
1087 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1088 if (fl->fl_error == 0)
1089 fibnum++;
1090 }
1091 if (fibnum > 0) {
1092 int firstfib = 1;
1093
1094 printf("%s %s %s", cmd,
1095 (nrflags & F_ISHOST) ? "host" : "net", dest);
1096 if (*gateway)
1097 printf(": gateway %s", gateway);
1098
1099 if (numfibs > 1) {
1100 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1101 if (fl->fl_error == 0
1102 && fl->fl_num >= 0) {
1103 if (firstfib) {
1104 printf(" fib ");
1105 firstfib = 0;
1106 }
1107 printf("%d", fl->fl_num);
1108 if (fibnum-- > 1)
1109 printf(",");
1110 }
1111 }
1112 }
1113 printf("\n");
1114 }
1115 }
1116
1117 fibnum = 0;
1118 TAILQ_FOREACH(fl, &fibl_head, fl_next) {
1119 if (fl->fl_error != 0) {
1120 error = 1;
1121 if (!qflag) {
1122 printf("%s %s %s", cmd, (nrflags & F_ISHOST)
1123 ? "host" : "net", dest);
1124 if (*gateway)
1125 printf(": gateway %s", gateway);
1126
1127 if (fl->fl_num >= 0)
1128 printf(" fib %d", fl->fl_num);
1129
1130 switch (fl->fl_errno) {
1131 case ESRCH:
1132 errmsg = "not in table";
1133 break;
1134 case EBUSY:
1135 errmsg = "entry in use";
1136 break;
1137 case ENOBUFS:
1138 errmsg = "not enough memory";
1139 break;
1140 case EADDRINUSE:
1141 /*
1142 * handle recursion avoidance
1143 * in rt_setgate()
1144 */
1145 errmsg = "gateway uses the same route";
1146 break;
1147 case EEXIST:
1148 errmsg = "route already in table";
1149 break;
1150 default:
1151 errmsg = strerror(fl->fl_errno);
1152 break;
1153 }
1154 printf(": %s\n", errmsg);
1155 }
1156 }
1157 }
1158 exit(error);
1159 }
1160
1161 static int
newroute_fib(int fib,char * cmd,int flags)1162 newroute_fib(int fib, char *cmd, int flags)
1163 {
1164 int error;
1165
1166 error = set_sofib(fib);
1167 if (error) {
1168 warn("fib number %d is ignored", fib);
1169 return (error);
1170 }
1171
1172 error = rtmsg(*cmd, flags, fib);
1173 return (error);
1174 }
1175
1176 #ifdef INET
1177 static void
inet_makemask(struct sockaddr_in * sin_mask,u_long bits)1178 inet_makemask(struct sockaddr_in *sin_mask, u_long bits)
1179 {
1180 u_long mask = 0;
1181
1182 rtm_addrs |= RTA_NETMASK;
1183
1184 if (bits != 0)
1185 mask = 0xffffffff << (32 - bits);
1186
1187 sin_mask->sin_addr.s_addr = htonl(mask);
1188 sin_mask->sin_len = sizeof(struct sockaddr_in);
1189 sin_mask->sin_family = AF_INET;
1190 }
1191 #endif
1192
1193 #ifdef INET6
1194 /*
1195 * XXX the function may need more improvement...
1196 */
1197 static int
inet6_makenetandmask(struct sockaddr_in6 * sin6,const char * plen)1198 inet6_makenetandmask(struct sockaddr_in6 *sin6, const char *plen)
1199 {
1200
1201 if (plen == NULL) {
1202 if (IN6_IS_ADDR_UNSPECIFIED(&sin6->sin6_addr) &&
1203 sin6->sin6_scope_id == 0)
1204 plen = "0";
1205 }
1206
1207 if (plen == NULL || strcmp(plen, "128") == 0)
1208 return (1);
1209 rtm_addrs |= RTA_NETMASK;
1210 prefixlen(plen);
1211 return (0);
1212 }
1213 #endif
1214
1215 /*
1216 * Interpret an argument as a network address of some kind,
1217 * returning 1 if a host address, 0 if a network address.
1218 */
1219 static int
getaddr(int idx,char * str,int nrflags)1220 getaddr(int idx, char *str, int nrflags)
1221 {
1222 struct sockaddr *sa;
1223 #if defined(INET)
1224 struct sockaddr_in *sin;
1225 struct hostent *hp;
1226 char *q;
1227 #elif defined(INET6)
1228 char *q;
1229 #endif
1230
1231 if (idx < 0 || idx >= RTAX_MAX)
1232 usage("internal error");
1233 if (af == 0) {
1234 #if defined(INET)
1235 af = AF_INET;
1236 aflen = sizeof(struct sockaddr_in);
1237 #elif defined(INET6)
1238 af = AF_INET6;
1239 aflen = sizeof(struct sockaddr_in6);
1240 #else
1241 af = AF_LINK;
1242 aflen = sizeof(struct sockaddr_dl);
1243 #endif
1244 }
1245 rtm_addrs |= (1 << idx);
1246 sa = (struct sockaddr *)&so[idx];
1247 sa->sa_family = af;
1248 sa->sa_len = aflen;
1249
1250 switch (idx) {
1251 case RTAX_GATEWAY:
1252 if (nrflags & F_INTERFACE) {
1253 struct ifaddrs *ifap, *ifa;
1254 struct sockaddr_dl *sdl0 = (struct sockaddr_dl *)(void *)sa;
1255 struct sockaddr_dl *sdl = NULL;
1256
1257 if (getifaddrs(&ifap))
1258 err(EX_OSERR, "getifaddrs");
1259
1260 for (ifa = ifap; ifa != NULL; ifa = ifa->ifa_next) {
1261 if (ifa->ifa_addr->sa_family != AF_LINK)
1262 continue;
1263
1264 if (strcmp(str, ifa->ifa_name) != 0)
1265 continue;
1266
1267 sdl = (struct sockaddr_dl *)(void *)ifa->ifa_addr;
1268 }
1269 /* If we found it, then use it */
1270 if (sdl != NULL) {
1271 /*
1272 * Note that we need to copy before calling
1273 * freeifaddrs().
1274 */
1275 memcpy(sdl0, sdl, sdl->sdl_len);
1276 }
1277 freeifaddrs(ifap);
1278 if (sdl != NULL)
1279 return(1);
1280 else
1281 errx(EX_DATAERR,
1282 "interface '%s' does not exist", str);
1283 }
1284 break;
1285 case RTAX_IFP:
1286 sa->sa_family = AF_LINK;
1287 break;
1288 }
1289 if (strcmp(str, "default") == 0) {
1290 /*
1291 * Default is net 0.0.0.0/0
1292 */
1293 switch (idx) {
1294 case RTAX_DST:
1295 nrflags |= F_FORCENET;
1296 getaddr(RTAX_NETMASK, str, nrflags);
1297 break;
1298 }
1299 return (0);
1300 }
1301 switch (sa->sa_family) {
1302 #ifdef INET6
1303 case AF_INET6:
1304 {
1305 struct addrinfo hints, *res;
1306 int ecode;
1307
1308 q = NULL;
1309 if (idx == RTAX_DST && (q = strchr(str, '/')) != NULL)
1310 *q = '\0';
1311 memset(&hints, 0, sizeof(hints));
1312 hints.ai_family = sa->sa_family;
1313 hints.ai_socktype = SOCK_DGRAM;
1314 ecode = getaddrinfo(str, NULL, &hints, &res);
1315 if (ecode != 0 || res->ai_family != AF_INET6 ||
1316 res->ai_addrlen != sizeof(struct sockaddr_in6))
1317 errx(EX_OSERR, "%s: %s", str, gai_strerror(ecode));
1318 memcpy(sa, res->ai_addr, res->ai_addrlen);
1319 freeaddrinfo(res);
1320 if (q != NULL)
1321 *q++ = '/';
1322 if (idx == RTAX_DST)
1323 return (inet6_makenetandmask((struct sockaddr_in6 *)(void *)sa, q));
1324 return (0);
1325 }
1326 #endif /* INET6 */
1327 case AF_LINK:
1328 link_addr(str, (struct sockaddr_dl *)(void *)sa);
1329 return (1);
1330
1331 case PF_ROUTE:
1332 sockaddr(str, sa, sizeof(struct sockaddr_storage));
1333 return (1);
1334 #ifdef INET
1335 case AF_INET:
1336 #endif
1337 default:
1338 break;
1339 }
1340
1341 #ifdef INET
1342 sin = (struct sockaddr_in *)(void *)sa;
1343
1344 q = strchr(str,'/');
1345 if (q != NULL && idx == RTAX_DST) {
1346 /* A.B.C.D/NUM */
1347 struct sockaddr_in *mask;
1348 uint32_t mask_bits;
1349
1350 *q = '\0';
1351 if (inet_aton(str, &sin->sin_addr) == 0)
1352 errx(EX_NOHOST, "bad address: %s", str);
1353
1354 int masklen = strtol(q + 1, NULL, 10);
1355 if (masklen < 0 || masklen > 32)
1356 errx(EX_NOHOST, "bad mask length: %s", q + 1);
1357
1358 inet_makemask((struct sockaddr_in *)&so[RTAX_NETMASK],masklen);
1359
1360 /*
1361 * Check for bogus destination such as "10/8"; heuristic is
1362 * that there are bits set in the host part, and no dot
1363 * is present.
1364 */
1365 mask = ((struct sockaddr_in *) &so[RTAX_NETMASK]);
1366 mask_bits = ntohl(mask->sin_addr.s_addr);
1367 if ((ntohl(sin->sin_addr.s_addr) & ~mask_bits) != 0 &&
1368 strchr(str, '.') == NULL)
1369 errx(EX_NOHOST,
1370 "malformed address, bits set after mask;"
1371 " %s means %s",
1372 str, inet_ntoa(sin->sin_addr));
1373 return (0);
1374 }
1375 if (inet_aton(str, &sin->sin_addr) != 0)
1376 return (1);
1377
1378 hp = gethostbyname(str);
1379 if (hp != NULL) {
1380 sin->sin_family = hp->h_addrtype;
1381 memmove((char *)&sin->sin_addr, hp->h_addr,
1382 MIN((size_t)hp->h_length, sizeof(sin->sin_addr)));
1383 return (1);
1384 }
1385 #endif
1386 errx(EX_NOHOST, "bad address: %s", str);
1387 }
1388
1389 static int
prefixlen(const char * str)1390 prefixlen(const char *str)
1391 {
1392 int len = atoi(str), q, r;
1393 int max;
1394 char *p;
1395
1396 rtm_addrs |= RTA_NETMASK;
1397 switch (af) {
1398 #ifdef INET6
1399 case AF_INET6:
1400 {
1401 struct sockaddr_in6 *sin6 =
1402 (struct sockaddr_in6 *)&so[RTAX_NETMASK];
1403
1404 max = 128;
1405 p = (char *)&sin6->sin6_addr;
1406 sin6->sin6_family = AF_INET6;
1407 sin6->sin6_len = sizeof(*sin6);
1408 break;
1409 }
1410 #endif
1411 #ifdef INET
1412 case AF_INET:
1413 {
1414 struct sockaddr_in *sin =
1415 (struct sockaddr_in *)&so[RTAX_NETMASK];
1416
1417 max = 32;
1418 p = (char *)&sin->sin_addr;
1419 sin->sin_family = AF_INET;
1420 sin->sin_len = sizeof(*sin);
1421 break;
1422 }
1423 #endif
1424 default:
1425 errx(EX_OSERR, "prefixlen not supported in this af");
1426 }
1427
1428 if (len < 0 || max < len)
1429 errx(EX_USAGE, "%s: invalid prefixlen", str);
1430
1431 q = len >> 3;
1432 r = len & 7;
1433 memset((void *)p, 0, max / 8);
1434 if (q > 0)
1435 memset((void *)p, 0xff, q);
1436 if (r > 0)
1437 *((u_char *)p + q) = (0xff00 >> r) & 0xff;
1438 if (len == max)
1439 return (-1);
1440 else
1441 return (len);
1442 }
1443
1444 static void
interfaces(void)1445 interfaces(void)
1446 {
1447 size_t needed;
1448 int mib[6];
1449 char *buf, *lim, *next, count = 0;
1450 struct rt_msghdr *rtm;
1451
1452 retry2:
1453 mib[0] = CTL_NET;
1454 mib[1] = PF_ROUTE;
1455 mib[2] = 0; /* protocol */
1456 mib[3] = AF_UNSPEC;
1457 mib[4] = NET_RT_IFLIST;
1458 mib[5] = 0; /* no flags */
1459 if (sysctl(mib, nitems(mib), NULL, &needed, NULL, 0) < 0)
1460 err(EX_OSERR, "route-sysctl-estimate");
1461 if ((buf = malloc(needed)) == NULL)
1462 errx(EX_OSERR, "malloc failed");
1463 if (sysctl(mib, nitems(mib), buf, &needed, NULL, 0) < 0) {
1464 if (errno == ENOMEM && count++ < 10) {
1465 warnx("Routing table grew, retrying");
1466 sleep(1);
1467 free(buf);
1468 goto retry2;
1469 }
1470 err(EX_OSERR, "actual retrieval of interface table");
1471 }
1472 lim = buf + needed;
1473 for (next = buf; next < lim; next += rtm->rtm_msglen) {
1474 rtm = (struct rt_msghdr *)(void *)next;
1475 print_rtmsg(rtm, rtm->rtm_msglen);
1476 }
1477 free(buf);
1478 }
1479
1480 static void
monitor(int argc,char * argv[])1481 monitor(int argc, char *argv[])
1482 {
1483 int fib, error;
1484 char *endptr;
1485
1486 fib = defaultfib;
1487 while (argc > 1) {
1488 argc--;
1489 argv++;
1490 if (**argv != '-')
1491 usage(*argv);
1492 switch (keyword(*argv + 1)) {
1493 case K_FIB:
1494 if (!--argc)
1495 usage(*argv);
1496 errno = 0;
1497 fib = strtol(*++argv, &endptr, 0);
1498 if (errno == 0) {
1499 if (*endptr != '\0' ||
1500 fib < 0 ||
1501 (numfibs != -1 && fib > numfibs - 1))
1502 errno = EINVAL;
1503 }
1504 if (errno)
1505 errx(EX_USAGE, "invalid fib number: %s", *argv);
1506 break;
1507 default:
1508 usage(*argv);
1509 }
1510 }
1511 error = set_sofib(fib);
1512 if (error)
1513 errx(EX_USAGE, "invalid fib number: %d", fib);
1514
1515 verbose = 1;
1516 if (debugonly) {
1517 interfaces();
1518 exit(0);
1519 }
1520 #ifdef WITHOUT_NETLINK
1521 monitor_rtsock();
1522 #else
1523 monitor_nl(fib);
1524 #endif
1525 }
1526
1527 #ifdef WITHOUT_NETLINK
1528 static void
monitor_rtsock(void)1529 monitor_rtsock(void)
1530 {
1531 char msg[2048];
1532 int n;
1533
1534 #ifdef SO_RERROR
1535 n = 1;
1536 if (setsockopt(s, SOL_SOCKET, SO_RERROR, &n, sizeof(n)) == -1)
1537 warn("SO_RERROR");
1538 #endif
1539
1540 for (;;) {
1541 time_t now;
1542 n = read(s, msg, sizeof(msg));
1543 if (n == -1) {
1544 warn("read");
1545 continue;
1546 }
1547 now = time(NULL);
1548 (void)printf("\ngot message of size %d on %s", n, ctime(&now));
1549 print_rtmsg((struct rt_msghdr *)(void *)msg, n);
1550 }
1551 }
1552 #endif
1553
1554 static int
rtmsg(int cmd,int flags,int fib)1555 rtmsg(int cmd, int flags, int fib)
1556 {
1557 errno = 0;
1558 if (cmd == 'a')
1559 cmd = RTM_ADD;
1560 else if (cmd == 'c')
1561 cmd = RTM_CHANGE;
1562 else if (cmd == 'g' || cmd == 's') {
1563 cmd = RTM_GET;
1564 if (so[RTAX_IFP].ss_family == 0) {
1565 so[RTAX_IFP].ss_family = AF_LINK;
1566 so[RTAX_IFP].ss_len = sizeof(struct sockaddr_dl);
1567 rtm_addrs |= RTA_IFP;
1568 }
1569 } else {
1570 cmd = RTM_DELETE;
1571 flags |= RTF_PINNED;
1572 }
1573 #ifdef WITHOUT_NETLINK
1574 return (rtmsg_rtsock(cmd, flags, fib));
1575 #else
1576 errno = rtmsg_nl(cmd, flags, fib, rtm_addrs, so, &rt_metrics);
1577 return (errno == 0 ? 0 : -1);
1578 #endif
1579 }
1580
1581 #ifdef WITHOUT_NETLINK
1582 static int
rtmsg_rtsock(int cmd,int flags,int fib)1583 rtmsg_rtsock(int cmd, int flags, int fib)
1584 {
1585 int rlen;
1586 char *cp = m_rtmsg.m_space;
1587 int l;
1588
1589 memset(&m_rtmsg, 0, sizeof(m_rtmsg));
1590
1591 #define NEXTADDR(w, u) \
1592 if (rtm_addrs & (w)) { \
1593 l = SA_SIZE(&(u)); \
1594 memmove(cp, (char *)&(u), l); \
1595 cp += l; \
1596 if (verbose) \
1597 sodump((struct sockaddr *)&(u), #w); \
1598 }
1599
1600 #define rtm m_rtmsg.m_rtm
1601 rtm.rtm_type = cmd;
1602 rtm.rtm_flags = flags;
1603 rtm.rtm_version = RTM_VERSION;
1604 rtm.rtm_seq = ++rtm_seq;
1605 rtm.rtm_addrs = rtm_addrs;
1606 rtm.rtm_rmx = rt_metrics;
1607 rtm.rtm_inits = rtm_inits;
1608
1609 NEXTADDR(RTA_DST, so[RTAX_DST]);
1610 NEXTADDR(RTA_GATEWAY, so[RTAX_GATEWAY]);
1611 NEXTADDR(RTA_NETMASK, so[RTAX_NETMASK]);
1612 NEXTADDR(RTA_GENMASK, so[RTAX_GENMASK]);
1613 NEXTADDR(RTA_IFP, so[RTAX_IFP]);
1614 NEXTADDR(RTA_IFA, so[RTAX_IFA]);
1615 rtm.rtm_msglen = l = cp - (char *)&m_rtmsg;
1616 if (verbose)
1617 print_rtmsg(&rtm, l);
1618 if (debugonly)
1619 return (0);
1620 if ((rlen = write(s, (char *)&m_rtmsg, l)) < 0) {
1621 switch (errno) {
1622 case EPERM:
1623 err(1, "writing to routing socket");
1624 break;
1625 case ESRCH:
1626 warnx("route has not been found");
1627 break;
1628 case EEXIST:
1629 /* Handled by newroute() */
1630 break;
1631 default:
1632 warn("writing to routing socket");
1633 }
1634 return (-1);
1635 }
1636 if (cmd == RTM_GET) {
1637 stop_read = 0;
1638 alarm(READ_TIMEOUT);
1639 do {
1640 l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
1641 } while (l > 0 && stop_read == 0 &&
1642 (rtm.rtm_type != RTM_GET || rtm.rtm_seq != rtm_seq ||
1643 rtm.rtm_pid != pid));
1644 if (stop_read != 0) {
1645 warnx("read from routing socket timed out");
1646 return (-1);
1647 } else
1648 alarm(0);
1649 if (l < 0)
1650 warn("read from routing socket");
1651 else
1652 print_getmsg(&rtm, l, fib);
1653 }
1654 #undef rtm
1655 return (0);
1656 }
1657 #endif
1658
1659 static const char *const msgtypes[] = {
1660 "",
1661 "RTM_ADD: Add Route",
1662 "RTM_DELETE: Delete Route",
1663 "RTM_CHANGE: Change Metrics or flags",
1664 "RTM_GET: Report Metrics",
1665 "RTM_LOSING: Kernel Suspects Partitioning",
1666 "RTM_REDIRECT: Told to use different route",
1667 "RTM_MISS: Lookup failed on this address",
1668 "RTM_LOCK: fix specified metrics",
1669 "RTM_OLDADD: caused by SIOCADDRT",
1670 "RTM_OLDDEL: caused by SIOCDELRT",
1671 "RTM_RESOLVE: Route created by cloning",
1672 "RTM_NEWADDR: address being added to iface",
1673 "RTM_DELADDR: address being removed from iface",
1674 "RTM_IFINFO: iface status change",
1675 "RTM_NEWMADDR: new multicast group membership on iface",
1676 "RTM_DELMADDR: multicast group membership removed from iface",
1677 "RTM_IFANNOUNCE: interface arrival/departure",
1678 "RTM_IEEE80211: IEEE 802.11 wireless event",
1679 };
1680
1681 static const char metricnames[] =
1682 "\011weight\010rttvar\7rtt\6ssthresh\5sendpipe\4recvpipe\3expire"
1683 "\1mtu";
1684 const char routeflags[] =
1685 "\1UP\2GATEWAY\3HOST\4REJECT\5DYNAMIC\6MODIFIED\7DONE"
1686 "\012XRESOLVE\013LLINFO\014STATIC\015BLACKHOLE"
1687 "\017PROTO2\020PROTO1\021PRCLONING\022WASCLONED\023PROTO3"
1688 "\024FIXEDMTU\025PINNED\026LOCAL\027BROADCAST\030MULTICAST\035STICKY";
1689 static const char ifnetflags[] =
1690 "\1UP\2BROADCAST\3DEBUG\4LOOPBACK\5PTP\6b6\7RUNNING\010NOARP"
1691 "\011PPROMISC\012ALLMULTI\013OACTIVE\014SIMPLEX\015LINK0\016LINK1"
1692 "\017LINK2\020MULTICAST";
1693 static const char addrnames[] =
1694 "\1DST\2GATEWAY\3NETMASK\4GENMASK\5IFP\6IFA\7AUTHOR\010BRD";
1695
1696 static const char errfmt[] =
1697 "\n%s: truncated route message, only %zu bytes left\n";
1698
1699 static void
print_rtmsg(struct rt_msghdr * rtm,size_t msglen)1700 print_rtmsg(struct rt_msghdr *rtm, size_t msglen)
1701 {
1702 struct if_msghdr *ifm;
1703 struct ifa_msghdr *ifam;
1704 #ifdef RTM_NEWMADDR
1705 struct ifma_msghdr *ifmam;
1706 #endif
1707 struct if_announcemsghdr *ifan;
1708 const char *state;
1709
1710 if (verbose == 0)
1711 return;
1712 if (rtm->rtm_version != RTM_VERSION) {
1713 (void)printf("routing message version %d not understood\n",
1714 rtm->rtm_version);
1715 return;
1716 }
1717 if (rtm->rtm_type < nitems(msgtypes))
1718 (void)printf("%s: ", msgtypes[rtm->rtm_type]);
1719 else
1720 (void)printf("unknown type %d: ", rtm->rtm_type);
1721 (void)printf("len %d, ", rtm->rtm_msglen);
1722
1723 #define REQUIRE(x) do { \
1724 if (msglen < sizeof(x)) \
1725 goto badlen; \
1726 else \
1727 msglen -= sizeof(x); \
1728 } while (0)
1729
1730 switch (rtm->rtm_type) {
1731 case RTM_IFINFO:
1732 REQUIRE(struct if_msghdr);
1733 ifm = (struct if_msghdr *)rtm;
1734 (void)printf("if# %d, ", ifm->ifm_index);
1735 switch (ifm->ifm_data.ifi_link_state) {
1736 case LINK_STATE_DOWN:
1737 state = "down";
1738 break;
1739 case LINK_STATE_UP:
1740 state = "up";
1741 break;
1742 default:
1743 state = "unknown";
1744 break;
1745 }
1746 (void)printf("link: %s, flags:", state);
1747 printb(ifm->ifm_flags, ifnetflags);
1748 pmsg_addrs((char *)(ifm + 1), ifm->ifm_addrs, msglen);
1749 break;
1750 case RTM_NEWADDR:
1751 case RTM_DELADDR:
1752 REQUIRE(struct ifa_msghdr);
1753 ifam = (struct ifa_msghdr *)rtm;
1754 (void)printf("metric %d, flags:", ifam->ifam_metric);
1755 printb(ifam->ifam_flags, routeflags);
1756 pmsg_addrs((char *)(ifam + 1), ifam->ifam_addrs, msglen);
1757 break;
1758 #ifdef RTM_NEWMADDR
1759 case RTM_NEWMADDR:
1760 case RTM_DELMADDR:
1761 REQUIRE(struct ifma_msghdr);
1762 ifmam = (struct ifma_msghdr *)rtm;
1763 pmsg_addrs((char *)(ifmam + 1), ifmam->ifmam_addrs, msglen);
1764 break;
1765 #endif
1766 case RTM_IFANNOUNCE:
1767 REQUIRE(struct if_announcemsghdr);
1768 ifan = (struct if_announcemsghdr *)rtm;
1769 (void)printf("if# %d, what: ", ifan->ifan_index);
1770 switch (ifan->ifan_what) {
1771 case IFAN_ARRIVAL:
1772 (void)printf("arrival");
1773 break;
1774 case IFAN_DEPARTURE:
1775 printf("departure");
1776 break;
1777 default:
1778 printf("#%d", ifan->ifan_what);
1779 break;
1780 }
1781 printf("\n");
1782 fflush(stdout);
1783 break;
1784
1785 default:
1786 if (rtm->rtm_type <= RTM_RESOLVE) {
1787 printf("pid: %ld, seq %d, errno %d, flags:",
1788 (long)rtm->rtm_pid, rtm->rtm_seq, rtm->rtm_errno);
1789 printb(rtm->rtm_flags, routeflags);
1790 pmsg_common(rtm, msglen);
1791 } else
1792 printf("type: %u, len: %zu\n", rtm->rtm_type, msglen);
1793 }
1794
1795 return;
1796
1797 badlen:
1798 (void)printf(errfmt, __func__, msglen);
1799 #undef REQUIRE
1800 }
1801
1802 static void
print_getmsg(struct rt_msghdr * rtm,int msglen,int fib)1803 print_getmsg(struct rt_msghdr *rtm, int msglen, int fib)
1804 {
1805 struct sockaddr *sp[RTAX_MAX];
1806 struct timespec ts;
1807 char *cp;
1808 int i;
1809
1810 memset(sp, 0, sizeof(sp));
1811 (void)printf(" route to: %s\n",
1812 routename((struct sockaddr *)&so[RTAX_DST]));
1813 if (rtm->rtm_version != RTM_VERSION) {
1814 warnx("routing message version %d not understood",
1815 rtm->rtm_version);
1816 return;
1817 }
1818 if (rtm->rtm_msglen > msglen) {
1819 warnx("message length mismatch, in packet %d, returned %d",
1820 rtm->rtm_msglen, msglen);
1821 return;
1822 }
1823 if (rtm->rtm_errno) {
1824 errno = rtm->rtm_errno;
1825 warn("message indicates error %d", errno);
1826 return;
1827 }
1828 cp = ((char *)(rtm + 1));
1829 for (i = 0; i < RTAX_MAX; i++)
1830 if (rtm->rtm_addrs & (1 << i)) {
1831 sp[i] = (struct sockaddr *)cp;
1832 cp += SA_SIZE((struct sockaddr *)cp);
1833 }
1834 if ((rtm->rtm_addrs & RTA_IFP) &&
1835 (sp[RTAX_IFP]->sa_family != AF_LINK ||
1836 ((struct sockaddr_dl *)(void *)sp[RTAX_IFP])->sdl_nlen == 0))
1837 sp[RTAX_IFP] = NULL;
1838 if (sp[RTAX_DST])
1839 (void)printf("destination: %s\n", routename(sp[RTAX_DST]));
1840 if (sp[RTAX_NETMASK])
1841 (void)printf(" mask: %s\n", routename(sp[RTAX_NETMASK]));
1842 if (sp[RTAX_GATEWAY] && (rtm->rtm_flags & RTF_GATEWAY))
1843 (void)printf(" gateway: %s\n", routename(sp[RTAX_GATEWAY]));
1844 if (fib >= 0)
1845 (void)printf(" fib: %u\n", (unsigned int)fib);
1846 if (sp[RTAX_IFP])
1847 (void)printf(" interface: %.*s\n",
1848 ((struct sockaddr_dl *)(void *)sp[RTAX_IFP])->sdl_nlen,
1849 ((struct sockaddr_dl *)(void *)sp[RTAX_IFP])->sdl_data);
1850 (void)printf(" flags: ");
1851 printb(rtm->rtm_flags, routeflags);
1852
1853 #define lock(f) ((rtm->rtm_rmx.rmx_locks & __CONCAT(RTV_,f)) ? 'L' : ' ')
1854 #define msec(u) (((u) + 500) / 1000) /* usec to msec */
1855 printf("\n%9s %9s %9s %9s %9s %10s %9s\n", "recvpipe",
1856 "sendpipe", "ssthresh", "rtt,msec", "mtu ", "weight", "expire");
1857 printf("%8lu%c ", rtm->rtm_rmx.rmx_recvpipe, lock(RPIPE));
1858 printf("%8lu%c ", rtm->rtm_rmx.rmx_sendpipe, lock(SPIPE));
1859 printf("%8lu%c ", rtm->rtm_rmx.rmx_ssthresh, lock(SSTHRESH));
1860 printf("%8lu%c ", msec(rtm->rtm_rmx.rmx_rtt), lock(RTT));
1861 printf("%8lu%c ", rtm->rtm_rmx.rmx_mtu, lock(MTU));
1862 printf("%8lu%c ", rtm->rtm_rmx.rmx_weight, lock(WEIGHT));
1863 if (rtm->rtm_rmx.rmx_expire > 0)
1864 clock_gettime(CLOCK_REALTIME_FAST, &ts);
1865 else
1866 ts.tv_sec = 0;
1867 printf("%8ld%c\n", (long)(rtm->rtm_rmx.rmx_expire - ts.tv_sec),
1868 lock(EXPIRE));
1869 #undef lock
1870 #undef msec
1871 #define RTA_IGN (RTA_DST|RTA_GATEWAY|RTA_NETMASK|RTA_IFP|RTA_IFA|RTA_BRD)
1872 if (verbose)
1873 pmsg_common(rtm, msglen);
1874 else if (rtm->rtm_addrs &~ RTA_IGN) {
1875 (void)printf("sockaddrs: ");
1876 printb(rtm->rtm_addrs, addrnames);
1877 putchar('\n');
1878 }
1879 #undef RTA_IGN
1880 }
1881
1882 static void
pmsg_common(struct rt_msghdr * rtm,size_t msglen)1883 pmsg_common(struct rt_msghdr *rtm, size_t msglen)
1884 {
1885
1886 (void)printf("\nlocks: ");
1887 printb(rtm->rtm_rmx.rmx_locks, metricnames);
1888 (void)printf(" inits: ");
1889 printb(rtm->rtm_inits, metricnames);
1890 if (msglen > sizeof(struct rt_msghdr))
1891 pmsg_addrs(((char *)(rtm + 1)), rtm->rtm_addrs,
1892 msglen - sizeof(struct rt_msghdr));
1893 else
1894 (void)fflush(stdout);
1895 }
1896
1897 static void
pmsg_addrs(char * cp,int addrs,size_t len)1898 pmsg_addrs(char *cp, int addrs, size_t len)
1899 {
1900 struct sockaddr *sa;
1901 int i;
1902
1903 if (addrs == 0) {
1904 (void)putchar('\n');
1905 return;
1906 }
1907 (void)printf("\nsockaddrs: ");
1908 printb(addrs, addrnames);
1909 putchar('\n');
1910 for (i = 0; i < RTAX_MAX; i++)
1911 if (addrs & (1 << i)) {
1912 sa = (struct sockaddr *)cp;
1913 if (len == 0 || len < SA_SIZE(sa)) {
1914 (void)printf(errfmt, __func__, len);
1915 break;
1916 }
1917 (void)printf(" %s", routename(sa));
1918 len -= SA_SIZE(sa);
1919 cp += SA_SIZE(sa);
1920 }
1921 (void)putchar('\n');
1922 (void)fflush(stdout);
1923 }
1924
1925 void
printb(int b,const char * str)1926 printb(int b, const char *str)
1927 {
1928 int i;
1929 int gotsome = 0;
1930
1931 if (b == 0)
1932 return;
1933 while ((i = *str++) != 0) {
1934 if (b & (1 << (i-1))) {
1935 if (gotsome == 0)
1936 i = '<';
1937 else
1938 i = ',';
1939 putchar(i);
1940 gotsome = 1;
1941 for (; (i = *str) > 32; str++)
1942 putchar(i);
1943 } else
1944 while (*str > 32)
1945 str++;
1946 }
1947 if (gotsome)
1948 putchar('>');
1949 }
1950
1951 int
keyword(const char * cp)1952 keyword(const char *cp)
1953 {
1954 const struct keytab *kt = keywords;
1955
1956 while (kt->kt_cp != NULL && strcmp(kt->kt_cp, cp) != 0)
1957 kt++;
1958 return (kt->kt_i);
1959 }
1960
1961 static void
sodump(struct sockaddr * sa,const char * which)1962 sodump(struct sockaddr *sa, const char *which)
1963 {
1964 #ifdef INET6
1965 char nbuf[INET6_ADDRSTRLEN];
1966 #endif
1967
1968 switch (sa->sa_family) {
1969 case AF_LINK:
1970 (void)printf("%s: link %s; ", which,
1971 link_ntoa((struct sockaddr_dl *)(void *)sa));
1972 break;
1973 #ifdef INET
1974 case AF_INET:
1975 (void)printf("%s: inet %s; ", which,
1976 inet_ntoa(((struct sockaddr_in *)(void *)sa)->sin_addr));
1977 break;
1978 #endif
1979 #ifdef INET6
1980 case AF_INET6:
1981 (void)printf("%s: inet6 %s; ", which, inet_ntop(sa->sa_family,
1982 &((struct sockaddr_in6 *)(void *)sa)->sin6_addr, nbuf,
1983 sizeof(nbuf)));
1984 break;
1985 #endif
1986 }
1987 (void)fflush(stdout);
1988 }
1989
1990 /* States*/
1991 #define VIRGIN 0
1992 #define GOTONE 1
1993 #define GOTTWO 2
1994 /* Inputs */
1995 #define DIGIT (4*0)
1996 #define END (4*1)
1997 #define DELIM (4*2)
1998
1999 static void
sockaddr(char * addr,struct sockaddr * sa,size_t size)2000 sockaddr(char *addr, struct sockaddr *sa, size_t size)
2001 {
2002 char *cp = (char *)sa;
2003 char *cplim = cp + size;
2004 int byte = 0, state = VIRGIN, new = 0 /* foil gcc */;
2005
2006 memset(cp, 0, size);
2007 cp++;
2008 do {
2009 if ((*addr >= '0') && (*addr <= '9')) {
2010 new = *addr - '0';
2011 } else if ((*addr >= 'a') && (*addr <= 'f')) {
2012 new = *addr - 'a' + 10;
2013 } else if ((*addr >= 'A') && (*addr <= 'F')) {
2014 new = *addr - 'A' + 10;
2015 } else if (*addr == '\0')
2016 state |= END;
2017 else
2018 state |= DELIM;
2019 addr++;
2020 switch (state /* | INPUT */) {
2021 case GOTTWO | DIGIT:
2022 *cp++ = byte; /*FALLTHROUGH*/
2023 case VIRGIN | DIGIT:
2024 state = GOTONE; byte = new; continue;
2025 case GOTONE | DIGIT:
2026 state = GOTTWO; byte = new + (byte << 4); continue;
2027 default: /* | DELIM */
2028 state = VIRGIN; *cp++ = byte; byte = 0; continue;
2029 case GOTONE | END:
2030 case GOTTWO | END:
2031 *cp++ = byte; /* FALLTHROUGH */
2032 case VIRGIN | END:
2033 break;
2034 }
2035 break;
2036 } while (cp < cplim);
2037 sa->sa_len = cp - (char *)sa;
2038 }
2039