1 /* $NetBSD: main.c,v 1.43 2022/04/07 19:33:37 andvar Exp $ */
2
3 /*
4 * Copyright (c) 1983, 1988, 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. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgment:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include "defs.h"
37 #include "pathnames.h"
38 #if defined(__NetBSD__)
39 #include <util.h>
40 #endif
41 #include <signal.h>
42 #include <fcntl.h>
43 #include <sys/file.h>
44
45 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1993\
46 The Regents of the University of California. All rights reserved.");
47 #ifdef __NetBSD__
48 __RCSID("$NetBSD: main.c,v 1.43 2022/04/07 19:33:37 andvar Exp $");
49 #elif defined(__FreeBSD__)
50 __RCSID("$FreeBSD$");
51 #else
52 __RCSID("Revision: 2.27 ");
53 #ident "Revision: 2.27 "
54 #endif
55
56 pid_t mypid;
57
58 naddr myaddr; /* system address */
59 char myname[MAXHOSTNAMELEN+1];
60
61 int verbose;
62
63 int supplier; /* supply or broadcast updates */
64 int supplier_set;
65 int ipforwarding = 1; /* kernel forwarding on */
66
67 int default_gateway; /* 1=advertise default */
68 int background = 1;
69 int ridhosts; /* 1=reduce host routes */
70 int mhome; /* 1=want multi-homed host route */
71 int advertise_mhome; /* 1=must continue advertising it */
72 int auth_ok = 1; /* 1=ignore auth if we do not care */
73
74 struct timeval epoch; /* when started */
75 struct timeval clk, prev_clk;
76 static int usec_fudge;
77 struct timeval now; /* current idea of time */
78 time_t now_stale;
79 time_t now_expire;
80 time_t now_garbage;
81
82 struct timeval next_bcast; /* next general broadcast */
83 struct timeval no_flash = { /* inhibit flash update */
84 EPOCH+SUPPLY_INTERVAL, 0
85 };
86
87 struct timeval flush_kern_timer;
88
89 fd_set *fdbitsp;
90 int sock_max;
91 int rip_sock = -1; /* RIP socket */
92 struct interface *rip_sock_mcast; /* current multicast interface */
93 int rt_sock; /* routing socket */
94 int rt_sock_seqno;
95
96
97 static int get_rip_sock(naddr, int);
98 static void timevalsub(struct timeval *, struct timeval *, struct timeval *);
99
100 int
main(int argc,char * argv[])101 main(int argc,
102 char *argv[])
103 {
104 int n, mib[4], off;
105 size_t len;
106 char *p, *q;
107 const char *cp;
108 struct timeval wtime, t2;
109 time_t dt;
110 fd_set *ibitsp = NULL;
111 naddr p_net, p_mask;
112 struct interface *ifp;
113 struct parm parm;
114 char *tracename = 0;
115
116
117 /* Some shells are badly broken and send SIGHUP to backgrounded
118 * processes.
119 */
120 signal(SIGHUP, SIG_IGN);
121
122 openlog("routed", LOG_PID, LOG_DAEMON);
123 ftrace = stdout;
124
125 gettimeofday(&clk, 0);
126 prev_clk = clk;
127 epoch = clk;
128 epoch.tv_sec -= EPOCH;
129 now.tv_sec = EPOCH;
130 now_stale = EPOCH - STALE_TIME;
131 now_expire = EPOCH - EXPIRE_TIME;
132 now_garbage = EPOCH - GARBAGE_TIME;
133 wtime.tv_sec = 0;
134
135 (void)gethostname(myname, sizeof(myname) - 1);
136 (void)gethost(myname, &myaddr);
137
138 while ((n = getopt(argc, argv, "sqdghmAtvT:F:P:")) != -1) {
139 switch (n) {
140 case 's':
141 supplier = 1;
142 supplier_set = 1;
143 break;
144
145 case 'q':
146 supplier = 0;
147 supplier_set = 1;
148 break;
149
150 case 'd':
151 background = 0;
152 break;
153
154 case 'g':
155 memset(&parm, 0, sizeof(parm));
156 parm.parm_d_metric = 1;
157 cp = check_parms(&parm);
158 if (cp != 0)
159 msglog("bad -g: %s", cp);
160 else
161 default_gateway = 1;
162 break;
163
164 case 'h': /* suppress extra host routes */
165 ridhosts = 1;
166 break;
167
168 case 'm': /* advertise host route */
169 mhome = 1; /* on multi-homed hosts */
170 break;
171
172 case 'A':
173 /* Ignore authentication if we do not care.
174 * Crazy as it is, that is what RFC 1723 requires.
175 */
176 auth_ok = 0;
177 break;
178
179 case 't':
180 new_tracelevel++;
181 break;
182
183 case 'T':
184 tracename = optarg;
185 break;
186
187 case 'F': /* minimal routes for SLIP */
188 n = FAKE_METRIC;
189 p = strchr(optarg,',');
190 if (p && *p != '\0') {
191 n = (int)strtoul(p+1, &q, 0);
192 if (*q == '\0'
193 && n <= HOPCNT_INFINITY-1
194 && n >= 1)
195 *p = '\0';
196 }
197 if (!getnet(optarg, &p_net, &p_mask)) {
198 msglog("bad network; \"-F %s\"",
199 optarg);
200 break;
201 }
202 memset(&parm, 0, sizeof(parm));
203 parm.parm_net = p_net;
204 parm.parm_mask = p_mask;
205 parm.parm_d_metric = n;
206 cp = check_parms(&parm);
207 if (cp != 0)
208 msglog("bad -F: %s", cp);
209 break;
210
211 case 'P':
212 /* handle arbitrary parameters.
213 */
214 q = strdup(optarg);
215 cp = parse_parms(q, 0);
216 if (cp != 0)
217 msglog("%s in \"-P %s\"", cp, optarg);
218 free(q);
219 break;
220
221 case 'v':
222 /* display version */
223 verbose++;
224 msglog("version 2.32");
225 break;
226
227 default:
228 goto usage;
229 }
230 }
231 argc -= optind;
232 argv += optind;
233
234 if (tracename == 0 && argc >= 1) {
235 tracename = *argv++;
236 argc--;
237 }
238 if (tracename != 0 && tracename[0] == '\0')
239 goto usage;
240 if (argc != 0) {
241 usage:
242 logbad(0, "usage: routed [-sqdghmAtv] [-T tracefile]"
243 " [-F net[/mask[,metric]]] [-P parms]");
244 }
245 if (geteuid() != 0) {
246 if (verbose)
247 exit(0);
248 logbad(0, "requires UID 0");
249 }
250
251 mib[0] = CTL_NET;
252 mib[1] = PF_INET;
253 mib[2] = IPPROTO_IP;
254 mib[3] = IPCTL_FORWARDING;
255 len = sizeof(ipforwarding);
256 if (sysctl(mib, 4, &ipforwarding, &len, 0, 0) < 0)
257 LOGERR("sysctl(IPCTL_FORWARDING)");
258
259 if (!ipforwarding) {
260 if (supplier)
261 msglog("-s incompatible with ipforwarding=0");
262 if (default_gateway) {
263 msglog("-g incompatible with ipforwarding=0");
264 default_gateway = 0;
265 }
266 supplier = 0;
267 supplier_set = 1;
268 }
269 if (default_gateway) {
270 if (supplier_set && !supplier) {
271 msglog("-g and -q incompatible");
272 } else {
273 supplier = 1;
274 supplier_set = 1;
275 }
276 }
277
278
279 signal(SIGALRM, sigalrm);
280 if (!background)
281 signal(SIGHUP, sigterm); /* SIGHUP fatal during debugging */
282 signal(SIGTERM, sigterm);
283 signal(SIGINT, sigterm);
284 signal(SIGUSR1, sigtrace_on);
285 signal(SIGUSR2, sigtrace_off);
286
287 /* get into the background */
288 if (background && daemon(0, 1) < 0)
289 BADERR(0,"daemon()");
290
291 #if defined(__NetBSD__)
292 pidfile(NULL);
293 #endif
294 mypid = getpid();
295
296 /* prepare socket connected to the kernel.
297 */
298 rt_sock = socket(AF_ROUTE, SOCK_RAW, 0);
299 if (rt_sock < 0)
300 BADERR(1,"rt_sock = socket()");
301 if (fcntl(rt_sock, F_SETFL, O_NONBLOCK) == -1)
302 logbad(1, "fcntl(rt_sock) O_NONBLOCK: %s", strerror(errno));
303 off = 0;
304 if (setsockopt(rt_sock, SOL_SOCKET,SO_USELOOPBACK,
305 &off,sizeof(off)) < 0)
306 LOGERR("setsockopt(SO_USELOOPBACK,0)");
307
308 fix_select();
309
310
311 if (tracename != 0) {
312 strlcpy(inittracename, tracename, sizeof(inittracename));
313 set_tracefile(inittracename, "%s", -1);
314 } else {
315 tracelevel_msg("%s", -1); /* turn on tracing to stdio */
316 }
317
318 bufinit();
319
320 /* initialize radix tree */
321 rtinit();
322
323 /* Pick a random part of the second for our output to minimize
324 * collisions.
325 *
326 * Start broadcasting after hearing from other routers, and
327 * at a random time so a bunch of systems do not get synchronized
328 * after a power failure.
329 */
330 intvl_random(&next_bcast, EPOCH+MIN_WAITTIME, EPOCH+SUPPLY_INTERVAL);
331 age_timer.tv_usec = next_bcast.tv_usec;
332 age_timer.tv_sec = EPOCH+MIN_WAITTIME;
333 rdisc_timer = next_bcast;
334 ifinit_timer.tv_usec = next_bcast.tv_usec;
335
336 /* Collect an initial view of the world by checking the interface
337 * configuration and the kludge file.
338 */
339 gwkludge();
340 ifinit();
341
342 /* Ask for routes */
343 rip_query();
344 rdisc_sol();
345
346 /* Now turn off stdio if not tracing */
347 if (new_tracelevel == 0)
348 trace_close(background);
349
350 /* Loop forever, listening and broadcasting.
351 */
352 for (;;) {
353 prev_clk = clk;
354 gettimeofday(&clk, 0);
355 if (prev_clk.tv_sec == clk.tv_sec
356 && prev_clk.tv_usec == clk.tv_usec+usec_fudge) {
357 /* Much of `routed` depends on time always advancing.
358 * On systems that do not guarantee that gettimeofday()
359 * produces unique timestamps even if called within
360 * a single tick, use trickery like that in classic
361 * BSD kernels.
362 */
363 clk.tv_usec += ++usec_fudge;
364
365 } else {
366 usec_fudge = 0;
367
368 timevalsub(&t2, &clk, &prev_clk);
369 if (t2.tv_sec < 0
370 || t2.tv_sec > wtime.tv_sec + 5) {
371 /* Deal with time changes before other
372 * housekeeping to keep everything straight.
373 */
374 dt = t2.tv_sec;
375 if (dt > 0)
376 dt -= wtime.tv_sec;
377 trace_act("time changed by %d sec", (int)dt);
378 epoch.tv_sec += dt;
379 }
380 }
381 timevalsub(&now, &clk, &epoch);
382 now_stale = now.tv_sec - STALE_TIME;
383 now_expire = now.tv_sec - EXPIRE_TIME;
384 now_garbage = now.tv_sec - GARBAGE_TIME;
385
386 /* deal with signals that should affect tracing */
387 set_tracelevel();
388
389 if (stopint != 0) {
390 rip_bcast(0);
391 rdisc_adv();
392 trace_off("exiting with signal %d", stopint);
393 exit(stopint | 128);
394 }
395
396 /* look for new or dead interfaces */
397 timevalsub(&wtime, &ifinit_timer, &now);
398 if (wtime.tv_sec <= 0) {
399 wtime.tv_sec = 0;
400 ifinit();
401 rip_query();
402 continue;
403 }
404
405 /* Check the kernel table occasionally for mysteriously
406 * evaporated routes
407 */
408 timevalsub(&t2, &flush_kern_timer, &now);
409 if (t2.tv_sec <= 0) {
410 flush_kern();
411 flush_kern_timer.tv_sec = (now.tv_sec
412 + CHECK_QUIET_INTERVAL);
413 continue;
414 }
415 if (timercmp(&t2, &wtime, <))
416 wtime = t2;
417
418 /* If it is time, then broadcast our routes.
419 */
420 if (supplier || advertise_mhome) {
421 timevalsub(&t2, &next_bcast, &now);
422 if (t2.tv_sec <= 0) {
423 /* Synchronize the aging and broadcast
424 * timers to minimize awakenings
425 */
426 age(0);
427
428 rip_bcast(0);
429
430 /* It is desirable to send routing updates
431 * regularly. So schedule the next update
432 * 30 seconds after the previous one was
433 * scheduled, instead of 30 seconds after
434 * the previous update was finished.
435 * Even if we just started after discovering
436 * a 2nd interface or were otherwise delayed,
437 * pick a 30-second aniversary of the
438 * original broadcast time.
439 */
440 n = 1 + (0-t2.tv_sec)/SUPPLY_INTERVAL;
441 next_bcast.tv_sec += n*SUPPLY_INTERVAL;
442
443 continue;
444 }
445
446 if (timercmp(&t2, &wtime, <))
447 wtime = t2;
448 }
449
450 /* If we need a flash update, either do it now or
451 * set the delay to end when it is time.
452 *
453 * If we are within MIN_WAITTIME seconds of a full update,
454 * do not bother.
455 */
456 if (need_flash
457 && supplier
458 && no_flash.tv_sec+MIN_WAITTIME < next_bcast.tv_sec) {
459 /* accurate to the millisecond */
460 if (!timercmp(&no_flash, &now, >))
461 rip_bcast(1);
462 timevalsub(&t2, &no_flash, &now);
463 if (timercmp(&t2, &wtime, <))
464 wtime = t2;
465 }
466
467 /* trigger the main aging timer.
468 */
469 timevalsub(&t2, &age_timer, &now);
470 if (t2.tv_sec <= 0) {
471 age(0);
472 continue;
473 }
474 if (timercmp(&t2, &wtime, <))
475 wtime = t2;
476
477 /* update the kernel routing table
478 */
479 timevalsub(&t2, &need_kern, &now);
480 if (t2.tv_sec <= 0) {
481 age(0);
482 continue;
483 }
484 if (timercmp(&t2, &wtime, <))
485 wtime = t2;
486
487 /* take care of router discovery,
488 * but do it in the correct the millisecond
489 */
490 if (!timercmp(&rdisc_timer, &now, >)) {
491 rdisc_age(0);
492 continue;
493 }
494 timevalsub(&t2, &rdisc_timer, &now);
495 if (timercmp(&t2, &wtime, <))
496 wtime = t2;
497
498
499 /* wait for input or a timer to expire.
500 */
501 trace_flush();
502 if (ibitsp)
503 free(ibitsp);
504 ibitsp = (fd_set *)calloc(howmany(sock_max, NFDBITS),
505 sizeof(fd_mask));
506 if (ibitsp == NULL)
507 BADERR(1, "calloc");
508 memcpy(ibitsp, fdbitsp, howmany(sock_max, NFDBITS) *
509 sizeof(fd_mask));
510 n = select(sock_max, ibitsp, 0, 0, &wtime);
511 if (n <= 0) {
512 if (n < 0 && errno != EINTR && errno != EAGAIN)
513 BADERR(1,"select");
514 continue;
515 }
516
517 if (FD_ISSET(rt_sock, ibitsp)) {
518 read_rt();
519 n--;
520 }
521 if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, ibitsp)) {
522 read_d();
523 n--;
524 }
525 if (rip_sock >= 0 && FD_ISSET(rip_sock, ibitsp)) {
526 read_rip(rip_sock, 0);
527 n--;
528 }
529
530 for (ifp = ifnet; n > 0 && 0 != ifp; ifp = ifp->int_next) {
531 if (ifp->int_rip_sock >= 0
532 && FD_ISSET(ifp->int_rip_sock, ibitsp)) {
533 read_rip(ifp->int_rip_sock, ifp);
534 n--;
535 }
536 }
537 }
538 }
539
540
541 /* ARGSUSED */
542 void
sigalrm(int s UNUSED)543 sigalrm(int s UNUSED)
544 {
545 /* Historically, SIGALRM would cause the daemon to check for
546 * new and broken interfaces.
547 */
548 ifinit_timer.tv_sec = now.tv_sec;
549 trace_act("SIGALRM");
550 }
551
552
553 /* watch for fatal signals */
554 void
sigterm(int sig)555 sigterm(int sig)
556 {
557 stopint = sig;
558 (void)signal(sig, SIG_DFL); /* catch it only once */
559 }
560
561
562 void
fix_select(void)563 fix_select(void)
564 {
565 struct interface *ifp;
566
567 sock_max = 0;
568
569 if (sock_max <= rt_sock)
570 sock_max = rt_sock + 1;
571 if (rip_sock >= 0)
572 if (sock_max <= rip_sock)
573 sock_max = rip_sock + 1;
574 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) {
575 if (ifp->int_rip_sock >= 0)
576 if (sock_max <= ifp->int_rip_sock)
577 sock_max = ifp->int_rip_sock + 1;
578 }
579 if (rdisc_sock >= 0)
580 if (sock_max <= rdisc_sock)
581 sock_max = rdisc_sock + 1;
582
583 if (fdbitsp)
584 free(fdbitsp);
585 fdbitsp = (fd_set *)calloc(howmany(sock_max, NFDBITS),
586 sizeof(fd_mask));
587 if (fdbitsp == NULL)
588 BADERR(1, "calloc");
589
590 FD_SET(rt_sock, fdbitsp);
591 if (rip_sock >= 0)
592 FD_SET(rip_sock, fdbitsp);
593 for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) {
594 if (ifp->int_rip_sock >= 0)
595 FD_SET(ifp->int_rip_sock, fdbitsp);
596 }
597 if (rdisc_sock >= 0)
598 FD_SET(rdisc_sock, fdbitsp);
599 }
600
601
602 void
fix_sock(int sock,const char * name)603 fix_sock(int sock,
604 const char *name)
605 {
606 int on;
607 #define MIN_SOCKBUF (4*1024)
608 static int rbuf;
609
610 if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1)
611 logbad(1, "fcntl(%s) O_NONBLOCK: %s",
612 name, strerror(errno));
613 on = 1;
614 if (setsockopt(sock, SOL_SOCKET,SO_BROADCAST, &on,sizeof(on)) < 0)
615 msglog("setsockopt(%s,SO_BROADCAST): %s",
616 name, strerror(errno));
617 #ifdef USE_PASSIFNAME
618 on = 1;
619 if (setsockopt(sock, SOL_SOCKET, SO_PASSIFNAME, &on,sizeof(on)) < 0)
620 msglog("setsockopt(%s,SO_PASSIFNAME): %s",
621 name, strerror(errno));
622 #endif
623
624 if (rbuf >= MIN_SOCKBUF) {
625 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
626 &rbuf, sizeof(rbuf)) < 0)
627 msglog("setsockopt(%s,SO_RCVBUF=%d): %s",
628 name, rbuf, strerror(errno));
629 } else {
630 for (rbuf = 60*1024; ; rbuf -= 4096) {
631 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
632 &rbuf, sizeof(rbuf)) == 0) {
633 trace_act("RCVBUF=%d", rbuf);
634 break;
635 }
636 if (rbuf < MIN_SOCKBUF) {
637 msglog("setsockopt(%s,SO_RCVBUF = %d): %s",
638 name, rbuf, strerror(errno));
639 break;
640 }
641 }
642 }
643 }
644
645
646 /* get a rip socket
647 */
648 static int /* <0 or file descriptor */
get_rip_sock(naddr addr,int serious)649 get_rip_sock(naddr addr,
650 int serious) /* 1=failure to bind is serious */
651 {
652 struct sockaddr_in rsin;
653 unsigned char ttl;
654 int s;
655
656
657 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
658 BADERR(1,"rip_sock = socket()");
659
660 memset(&rsin, 0, sizeof(rsin));
661 #ifdef _HAVE_SIN_LEN
662 rsin.sin_len = sizeof(rsin);
663 #endif
664 rsin.sin_family = AF_INET;
665 rsin.sin_port = htons(RIP_PORT);
666 rsin.sin_addr.s_addr = addr;
667 if (bind(s, (struct sockaddr *)&rsin, sizeof(rsin)) < 0) {
668 if (serious)
669 BADERR(errno != EADDRINUSE, "bind(rip_sock)");
670 return -1;
671 }
672 fix_sock(s,"rip_sock");
673
674 ttl = 1;
675 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL,
676 &ttl, sizeof(ttl)) < 0)
677 DBGERR(1,"rip_sock setsockopt(IP_MULTICAST_TTL)");
678
679 return s;
680 }
681
682
683 /* turn off main RIP socket */
684 void
rip_off(void)685 rip_off(void)
686 {
687 struct interface *ifp;
688 naddr addr;
689
690
691 if (rip_sock >= 0 && !mhome) {
692 trace_act("turn off RIP");
693
694 (void)close(rip_sock);
695 rip_sock = -1;
696
697 /* get non-broadcast sockets to listen to queries.
698 */
699 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) {
700 if (ifp->int_state & IS_REMOTE)
701 continue;
702 if (ifp->int_rip_sock < 0) {
703 addr = ((ifp->int_if_flags & IFF_POINTOPOINT)
704 ? ifp->int_dstaddr
705 : ifp->int_addr);
706 ifp->int_rip_sock = get_rip_sock(addr, 0);
707 }
708 }
709
710 fix_select();
711
712 age(0);
713 }
714 }
715
716
717 /* turn on RIP multicast input via an interface
718 */
719 static void
rip_mcast_on(struct interface * ifp)720 rip_mcast_on(struct interface *ifp)
721 {
722 struct ip_mreq m;
723
724 if (!IS_RIP_IN_OFF(ifp->int_state)
725 && (ifp->int_if_flags & IFF_MULTICAST)
726 #ifdef MCAST_PPP_BUG
727 && !(ifp->int_if_flags & IFF_POINTOPOINT)
728 #endif
729 && !(ifp->int_state & IS_ALIAS)) {
730 m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP);
731 #ifdef MCAST_IFINDEX
732 m.imr_interface.s_addr = htonl(ifp->int_index);
733 #else
734 m.imr_interface.s_addr = ((ifp->int_if_flags & IFF_POINTOPOINT)
735 ? ifp->int_dstaddr
736 : ifp->int_addr);
737 #endif
738 if (setsockopt(rip_sock,IPPROTO_IP, IP_ADD_MEMBERSHIP,
739 &m, sizeof(m)) < 0)
740 LOGERR("setsockopt(IP_ADD_MEMBERSHIP RIP)");
741 }
742 }
743
744
745 /* Prepare socket used for RIP.
746 */
747 void
rip_on(struct interface * ifp)748 rip_on(struct interface *ifp)
749 {
750 /* If the main RIP socket is already alive, only start receiving
751 * multicasts for this interface.
752 */
753 if (rip_sock >= 0) {
754 if (ifp != 0)
755 rip_mcast_on(ifp);
756 return;
757 }
758
759 /* If the main RIP socket is off and it makes sense to turn it on,
760 * then turn it on for all of the interfaces.
761 * It makes sense if either router discovery is off, or if
762 * router discover is on and at most one interface is doing RIP.
763 */
764 if (rip_interfaces > 0 && (!rdisc_ok || rip_interfaces > 1)) {
765 trace_act("turn on RIP");
766
767 /* Close all of the query sockets so that we can open
768 * the main socket. SO_REUSEPORT is not a solution,
769 * since that would let two daemons bind to the broadcast
770 * socket.
771 */
772 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) {
773 if (ifp->int_rip_sock >= 0) {
774 (void)close(ifp->int_rip_sock);
775 ifp->int_rip_sock = -1;
776 }
777 }
778
779 rip_sock = get_rip_sock(INADDR_ANY, 1);
780 rip_sock_mcast = 0;
781
782 /* Do not advertise anything until we have heard something
783 */
784 if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME)
785 next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME;
786
787 for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) {
788 ifp->int_query_time = NEVER;
789 rip_mcast_on(ifp);
790 }
791 ifinit_timer.tv_sec = now.tv_sec;
792
793 } else if (ifp != 0
794 && !(ifp->int_state & IS_REMOTE)
795 && ifp->int_rip_sock < 0) {
796 /* RIP is off, so ensure there are sockets on which
797 * to listen for queries.
798 */
799 ifp->int_rip_sock = get_rip_sock(ifp->int_addr, 0);
800 }
801
802 fix_select();
803 }
804
805
806 /* die if malloc(3) fails
807 */
808 void *
rtmalloc(size_t size,const char * msg)809 rtmalloc(size_t size,
810 const char *msg)
811 {
812 void *p = malloc(size);
813 if (p == 0)
814 logbad(1,"malloc(%lu) failed in %s", (u_long)size, msg);
815 return p;
816 }
817
818
819 /* get a random instant in an interval
820 */
821 void
intvl_random(struct timeval * tp,u_long lo,u_long hi)822 intvl_random(struct timeval *tp, /* put value here */
823 u_long lo, /* value is after this second */
824 u_long hi) /* and before this */
825 {
826 tp->tv_sec = (time_t)(hi == lo
827 ? lo
828 : (lo + arc4random() % ((hi - lo))));
829 tp->tv_usec = arc4random() % 1000000;
830 }
831
832
833 void
timevaladd(struct timeval * t1,struct timeval * t2)834 timevaladd(struct timeval *t1,
835 struct timeval *t2)
836 {
837
838 t1->tv_sec += t2->tv_sec;
839 if ((t1->tv_usec += t2->tv_usec) >= 1000000) {
840 t1->tv_sec++;
841 t1->tv_usec -= 1000000;
842 }
843 }
844
845
846 /* t1 = t2 - t3
847 */
848 static void
timevalsub(struct timeval * t1,struct timeval * t2,struct timeval * t3)849 timevalsub(struct timeval *t1,
850 struct timeval *t2,
851 struct timeval *t3)
852 {
853 t1->tv_sec = t2->tv_sec - t3->tv_sec;
854 if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) {
855 t1->tv_sec--;
856 t1->tv_usec += 1000000;
857 }
858 }
859
860
861 /* put a message into the system log
862 */
863 void
msglog(const char * p,...)864 msglog(const char *p, ...)
865 {
866 va_list args;
867
868 trace_flush();
869
870 va_start(args, p);
871 vsyslog(LOG_ERR, p, args);
872 va_end(args);
873
874 if (ftrace != 0) {
875 if (ftrace == stdout)
876 (void)fputs("routed: ", ftrace);
877 va_start(args, p);
878 (void)vfprintf(ftrace, p, args);
879 va_end(args);
880 (void)fputc('\n', ftrace);
881 }
882 }
883
884
885 /* Put a message about a bad system into the system log if
886 * we have not complained about it recently.
887 *
888 * It is desirable to complain about all bad systems, but not too often.
889 * In the worst case, it is not practical to keep track of all bad systems.
890 * For example, there can be many systems with the wrong password.
891 */
892 void
msglim(struct msg_limit * lim,naddr addr,const char * p,...)893 msglim(struct msg_limit *lim, naddr addr, const char *p, ...)
894 {
895 va_list args;
896 int i;
897 struct msg_sub *ms1, *ms;
898 const char *p1;
899
900 /* look for the oldest slot in the table
901 * or the slot for the bad router.
902 */
903 ms = ms1 = lim->subs;
904 for (i = MSG_SUBJECT_N; ; i--, ms1++) {
905 if (i == 0) {
906 /* Reuse a slot at most once every 10 minutes.
907 */
908 if (lim->reuse > now.tv_sec) {
909 ms = 0;
910 } else {
911 ms = ms1;
912 lim->reuse = now.tv_sec + 10*60;
913 }
914 break;
915 }
916 if (ms->addr == addr) {
917 /* Repeat a complaint about a given system at
918 * most once an hour.
919 */
920 if (ms->until > now.tv_sec)
921 ms = 0;
922 break;
923 }
924 if (ms->until < ms1->until)
925 ms = ms1;
926 }
927 if (ms != 0) {
928 ms->addr = addr;
929 ms->until = now.tv_sec + 60*60; /* 60 minutes */
930
931 trace_flush();
932 for (p1 = p; *p1 == ' '; p1++)
933 continue;
934 va_start(args, p);
935 vsyslog(LOG_ERR, p1, args);
936 va_end(args);
937 }
938
939 /* always display the message if tracing */
940 if (ftrace != 0) {
941 va_start(args, p);
942 (void)vfprintf(ftrace, p, args);
943 (void)fputc('\n', ftrace);
944 va_end(args);
945 }
946 }
947
948
949 void
logbad(int dump,const char * p,...)950 logbad(int dump, const char *p, ...)
951 {
952 va_list args;
953
954 trace_flush();
955
956 va_start(args, p);
957 vsyslog(LOG_ERR, p, args);
958 va_end(args);
959
960 (void)fputs("routed: ", stderr);
961 va_start(args, p);
962 (void)vfprintf(stderr, p, args);
963 va_end(args);
964 (void)fputs("; giving up\n",stderr);
965 (void)fflush(stderr);
966
967 if (dump)
968 abort();
969 exit(1);
970 }
971