1 /*
2 * Copyright (c) 1983, 1988, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 *
29 * $FreeBSD$
30 */
31
32 #include "defs.h"
33 #include "pathnames.h"
34 #ifdef sgi
35 #include "math.h"
36 #endif
37 #include <signal.h>
38 #include <fcntl.h>
39 #include <sys/file.h>
40
41 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1993 "
42 "The Regents of the University of California."
43 " All rights reserved.");
44 #ifdef __NetBSD__
45 __RCSID("$NetBSD$");
46 #include <util.h>
47 #elif defined(__FreeBSD__)
48 __RCSID("$FreeBSD$");
49 #else
50 __RCSID("$Revision: 2.31 $");
51 #ident "$Revision: 2.31 $"
52 #endif
53
54 pid_t mypid;
55
56 naddr myaddr; /* system address */
57 static char myname[MAXHOSTNAMELEN+1];
58
59 static int verbose;
60
61 int supplier; /* supply or broadcast updates */
62 int supplier_set;
63 static int ipforwarding = 1; /* kernel forwarding on */
64
65 static int default_gateway; /* 1=advertise default */
66 static int background = 1;
67 int ridhosts; /* 1=reduce host routes */
68 int mhome; /* 1=want multi-homed host route */
69 int advertise_mhome; /* 1=must continue advertising it */
70 int auth_ok = 1; /* 1=ignore auth if we do not care */
71 int insecure; /* Reply to special queries or not */
72
73 struct timeval epoch; /* when started */
74 struct timeval clk;
75 static struct timeval 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 static struct timeval next_bcast; /* next general broadcast */
83 struct timeval no_flash = { /* inhibit flash update */
84 EPOCH+SUPPLY_INTERVAL, 0
85 };
86
87 static struct timeval flush_kern_timer;
88
89 static fd_set fdbits;
90 static int sock_max;
91 int rip_sock = -1; /* RIP socket */
92 const 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 static void sigalrm(int s UNUSED);
100 static void sigterm(int sig);
101
102 int
main(int argc,char * argv[])103 main(int argc,
104 char *argv[])
105 {
106 int n, mib[4], off;
107 size_t len;
108 char *p, *q;
109 const char *cp;
110 struct timeval wtime, t2;
111 time_t dt;
112 fd_set ibits;
113 naddr p_net, p_mask;
114 struct interface *ifp;
115 struct parm parm;
116 char *tracename = 0;
117
118
119 /* Some shells are badly broken and send SIGHUP to backgrounded
120 * processes.
121 */
122 signal(SIGHUP, SIG_IGN);
123
124 openlog("routed", LOG_PID, LOG_DAEMON);
125 ftrace = stdout;
126
127 gettimeofday(&clk, 0);
128 prev_clk = clk;
129 epoch = clk;
130 epoch.tv_sec -= EPOCH;
131 now.tv_sec = EPOCH;
132 now_stale = EPOCH - STALE_TIME;
133 now_expire = EPOCH - EXPIRE_TIME;
134 now_garbage = EPOCH - GARBAGE_TIME;
135 wtime.tv_sec = 0;
136
137 (void)gethostname(myname, sizeof(myname)-1);
138 (void)gethost(myname, &myaddr);
139
140 while ((n = getopt(argc, argv, "isqdghmAtvT:F:P:")) != -1) {
141 switch (n) {
142 case 'i':
143 insecure++;
144 break;
145 case 's':
146 supplier = 1;
147 supplier_set = 1;
148 break;
149
150 case 'q':
151 supplier = 0;
152 supplier_set = 1;
153 break;
154
155 case 'd':
156 background = 0;
157 break;
158
159 case 'g':
160 memset(&parm, 0, sizeof(parm));
161 parm.parm_d_metric = 1;
162 cp = check_parms(&parm);
163 if (cp != 0)
164 msglog("bad -g: %s", cp);
165 else
166 default_gateway = 1;
167 break;
168
169 case 'h': /* suppress extra host routes */
170 ridhosts = 1;
171 break;
172
173 case 'm': /* advertise host route */
174 mhome = 1; /* on multi-homed hosts */
175 break;
176
177 case 'A':
178 /* Ignore authentication if we do not care.
179 * Crazy as it is, that is what RFC 1723 requires.
180 */
181 auth_ok = 0;
182 break;
183
184 case 't':
185 new_tracelevel++;
186 break;
187
188 case 'T':
189 tracename = optarg;
190 break;
191
192 case 'F': /* minimal routes for SLIP */
193 n = FAKE_METRIC;
194 p = strchr(optarg,',');
195 if (p && *p != '\0') {
196 n = (int)strtoul(p+1, &q, 0);
197 if (*q == '\0'
198 && n <= HOPCNT_INFINITY-1
199 && n >= 1)
200 *p = '\0';
201 }
202 if (!getnet(optarg, &p_net, &p_mask)) {
203 msglog("bad network; \"-F %s\"",
204 optarg);
205 break;
206 }
207 memset(&parm, 0, sizeof(parm));
208 parm.parm_net = p_net;
209 parm.parm_mask = p_mask;
210 parm.parm_d_metric = n;
211 cp = check_parms(&parm);
212 if (cp != 0)
213 msglog("bad -F: %s", cp);
214 break;
215
216 case 'P':
217 /* handle arbitrary parameters.
218 */
219 q = strdup(optarg);
220 cp = parse_parms(q, 0);
221 if (cp != 0)
222 msglog("%s in \"-P %s\"", cp, optarg);
223 free(q);
224 break;
225
226 case 'v':
227 /* display version */
228 verbose++;
229 msglog("version 2.31");
230 break;
231
232 default:
233 goto usage;
234 }
235 }
236 argc -= optind;
237 argv += optind;
238
239 if (tracename == 0 && argc >= 1) {
240 tracename = *argv++;
241 argc--;
242 }
243 if (tracename != 0 && tracename[0] == '\0')
244 goto usage;
245 if (argc != 0) {
246 usage:
247 logbad(0, "usage: routed [-sqdghmAtv] [-T tracefile]"
248 " [-F net[,metric]] [-P parms]");
249 }
250 if (geteuid() != 0) {
251 if (verbose)
252 exit(0);
253 logbad(0, "requires UID 0");
254 }
255
256 mib[0] = CTL_NET;
257 mib[1] = PF_INET;
258 mib[2] = IPPROTO_IP;
259 mib[3] = IPCTL_FORWARDING;
260 len = sizeof(ipforwarding);
261 if (sysctl(mib, 4, &ipforwarding, &len, 0, 0) < 0)
262 LOGERR("sysctl(IPCTL_FORWARDING)");
263
264 if (!ipforwarding) {
265 if (supplier)
266 msglog("-s incompatible with ipforwarding=0");
267 if (default_gateway) {
268 msglog("-g incompatible with ipforwarding=0");
269 default_gateway = 0;
270 }
271 supplier = 0;
272 supplier_set = 1;
273 }
274 if (default_gateway) {
275 if (supplier_set && !supplier) {
276 msglog("-g and -q incompatible");
277 } else {
278 supplier = 1;
279 supplier_set = 1;
280 }
281 }
282
283
284 signal(SIGALRM, sigalrm);
285 if (!background)
286 signal(SIGHUP, sigterm); /* SIGHUP fatal during debugging */
287 signal(SIGTERM, sigterm);
288 signal(SIGINT, sigterm);
289 signal(SIGUSR1, sigtrace_on);
290 signal(SIGUSR2, sigtrace_off);
291
292 /* get into the background */
293 #ifdef sgi
294 if (0 > _daemonize(background ? 0 : (_DF_NOCHDIR|_DF_NOFORK),
295 STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO))
296 BADERR(0, "_daemonize()");
297 #else
298 if (background && daemon(0, 1) < 0)
299 BADERR(0,"daemon()");
300 #endif
301
302 #if defined(__NetBSD__)
303 pidfile(0);
304 #endif
305 mypid = getpid();
306 #ifdef __FreeBSD__
307 srandomdev();
308 #else
309 srandom((int)(clk.tv_sec ^ clk.tv_usec ^ mypid));
310 #endif
311
312 /* prepare socket connected to the kernel.
313 */
314 rt_sock = socket(AF_ROUTE, SOCK_RAW, 0);
315 if (rt_sock < 0)
316 BADERR(1,"rt_sock = socket()");
317 if (fcntl(rt_sock, F_SETFL, O_NONBLOCK) == -1)
318 logbad(1, "fcntl(rt_sock) O_NONBLOCK: %s", strerror(errno));
319 off = 0;
320 if (setsockopt(rt_sock, SOL_SOCKET,SO_USELOOPBACK,
321 &off,sizeof(off)) < 0)
322 LOGERR("setsockopt(SO_USELOOPBACK,0)");
323
324 fix_select();
325
326
327 if (tracename != 0) {
328 strncpy(inittracename, tracename, sizeof(inittracename)-1);
329 set_tracefile(inittracename, "%s", -1);
330 } else {
331 tracelevel_msg("%s", -1); /* turn on tracing to stdio */
332 }
333
334 bufinit();
335
336 /* initialize radix tree */
337 rtinit();
338
339 /* Pick a random part of the second for our output to minimize
340 * collisions.
341 *
342 * Start broadcasting after hearing from other routers, and
343 * at a random time so a bunch of systems do not get synchronized
344 * after a power failure.
345 */
346 intvl_random(&next_bcast, EPOCH+MIN_WAITTIME, EPOCH+SUPPLY_INTERVAL);
347 age_timer.tv_usec = next_bcast.tv_usec;
348 age_timer.tv_sec = EPOCH+MIN_WAITTIME;
349 rdisc_timer = next_bcast;
350 ifinit_timer.tv_usec = next_bcast.tv_usec;
351
352 /* Collect an initial view of the world by checking the interface
353 * configuration and the kludge file.
354 */
355 gwkludge();
356 ifinit();
357
358 /* Ask for routes */
359 rip_query();
360 rdisc_sol();
361
362 /* Now turn off stdio if not tracing */
363 if (new_tracelevel == 0)
364 trace_close(background);
365
366 /* Loop forever, listening and broadcasting.
367 */
368 for (;;) {
369 prev_clk = clk;
370 gettimeofday(&clk, 0);
371 if (prev_clk.tv_sec == clk.tv_sec
372 && prev_clk.tv_usec == clk.tv_usec+usec_fudge) {
373 /* Much of `routed` depends on time always advancing.
374 * On systems that do not guarantee that gettimeofday()
375 * produces unique timestamps even if called within
376 * a single tick, use trickery like that in classic
377 * BSD kernels.
378 */
379 clk.tv_usec += ++usec_fudge;
380
381 } else {
382 usec_fudge = 0;
383
384 timevalsub(&t2, &clk, &prev_clk);
385 if (t2.tv_sec < 0
386 || t2.tv_sec > wtime.tv_sec + 5) {
387 /* Deal with time changes before other
388 * housekeeping to keep everything straight.
389 */
390 dt = t2.tv_sec;
391 if (dt > 0)
392 dt -= wtime.tv_sec;
393 trace_act("time changed by %d sec", (int)dt);
394 epoch.tv_sec += dt;
395 }
396 }
397 timevalsub(&now, &clk, &epoch);
398 now_stale = now.tv_sec - STALE_TIME;
399 now_expire = now.tv_sec - EXPIRE_TIME;
400 now_garbage = now.tv_sec - GARBAGE_TIME;
401
402 /* deal with signals that should affect tracing */
403 set_tracelevel();
404
405 if (stopint != 0) {
406 rip_bcast(0);
407 rdisc_adv();
408 trace_off("exiting with signal %d", stopint);
409 exit(stopint | 128);
410 }
411
412 /* look for new or dead interfaces */
413 timevalsub(&wtime, &ifinit_timer, &now);
414 if (wtime.tv_sec <= 0) {
415 wtime.tv_sec = 0;
416 ifinit();
417 rip_query();
418 continue;
419 }
420
421 /* Check the kernel table occasionally for mysteriously
422 * evaporated routes
423 */
424 timevalsub(&t2, &flush_kern_timer, &now);
425 if (t2.tv_sec <= 0) {
426 flush_kern();
427 flush_kern_timer.tv_sec = (now.tv_sec
428 + CHECK_QUIET_INTERVAL);
429 continue;
430 }
431 if (timercmp(&t2, &wtime, <))
432 wtime = t2;
433
434 /* If it is time, then broadcast our routes.
435 */
436 if (supplier || advertise_mhome) {
437 timevalsub(&t2, &next_bcast, &now);
438 if (t2.tv_sec <= 0) {
439 /* Synchronize the aging and broadcast
440 * timers to minimize awakenings
441 */
442 age(0);
443
444 rip_bcast(0);
445
446 /* It is desirable to send routing updates
447 * regularly. So schedule the next update
448 * 30 seconds after the previous one was
449 * scheduled, instead of 30 seconds after
450 * the previous update was finished.
451 * Even if we just started after discovering
452 * a 2nd interface or were otherwise delayed,
453 * pick a 30-second anniversary of the
454 * original broadcast time.
455 */
456 n = 1 + (0-t2.tv_sec)/SUPPLY_INTERVAL;
457 next_bcast.tv_sec += n*SUPPLY_INTERVAL;
458
459 continue;
460 }
461
462 if (timercmp(&t2, &wtime, <))
463 wtime = t2;
464 }
465
466 /* If we need a flash update, either do it now or
467 * set the delay to end when it is time.
468 *
469 * If we are within MIN_WAITTIME seconds of a full update,
470 * do not bother.
471 */
472 if (need_flash
473 && supplier
474 && no_flash.tv_sec+MIN_WAITTIME < next_bcast.tv_sec) {
475 /* accurate to the millisecond */
476 if (!timercmp(&no_flash, &now, >))
477 rip_bcast(1);
478 timevalsub(&t2, &no_flash, &now);
479 if (timercmp(&t2, &wtime, <))
480 wtime = t2;
481 }
482
483 /* trigger the main aging timer.
484 */
485 timevalsub(&t2, &age_timer, &now);
486 if (t2.tv_sec <= 0) {
487 age(0);
488 continue;
489 }
490 if (timercmp(&t2, &wtime, <))
491 wtime = t2;
492
493 /* update the kernel routing table
494 */
495 timevalsub(&t2, &need_kern, &now);
496 if (t2.tv_sec <= 0) {
497 age(0);
498 continue;
499 }
500 if (timercmp(&t2, &wtime, <))
501 wtime = t2;
502
503 /* take care of router discovery,
504 * but do it in the correct the millisecond
505 */
506 if (!timercmp(&rdisc_timer, &now, >)) {
507 rdisc_age(0);
508 continue;
509 }
510 timevalsub(&t2, &rdisc_timer, &now);
511 if (timercmp(&t2, &wtime, <))
512 wtime = t2;
513
514
515 /* wait for input or a timer to expire.
516 */
517 trace_flush();
518 ibits = fdbits;
519 n = select(sock_max, &ibits, 0, 0, &wtime);
520 if (n <= 0) {
521 if (n < 0 && errno != EINTR && errno != EAGAIN)
522 BADERR(1,"select");
523 continue;
524 }
525
526 if (FD_ISSET(rt_sock, &ibits)) {
527 read_rt();
528 n--;
529 }
530 if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, &ibits)) {
531 read_d();
532 n--;
533 }
534 if (rip_sock >= 0 && FD_ISSET(rip_sock, &ibits)) {
535 read_rip(rip_sock, 0);
536 n--;
537 }
538
539 LIST_FOREACH(ifp, &ifnet, int_list) {
540 if (n <= 0)
541 break;
542 if (ifp->int_rip_sock >= 0
543 && FD_ISSET(ifp->int_rip_sock, &ibits)) {
544 read_rip(ifp->int_rip_sock, ifp);
545 n--;
546 }
547 }
548 }
549 }
550
551
552 /* ARGSUSED */
553 static void
sigalrm(int s UNUSED)554 sigalrm(int s UNUSED)
555 {
556 /* Historically, SIGALRM would cause the daemon to check for
557 * new and broken interfaces.
558 */
559 ifinit_timer.tv_sec = now.tv_sec;
560 trace_act("SIGALRM");
561 }
562
563
564 /* watch for fatal signals */
565 static void
sigterm(int sig)566 sigterm(int sig)
567 {
568 stopint = sig;
569 (void)signal(sig, SIG_DFL); /* catch it only once */
570 }
571
572
573 void
fix_select(void)574 fix_select(void)
575 {
576 struct interface *ifp;
577
578
579 FD_ZERO(&fdbits);
580 sock_max = 0;
581
582 FD_SET(rt_sock, &fdbits);
583 if (sock_max <= rt_sock)
584 sock_max = rt_sock+1;
585 if (rip_sock >= 0) {
586 FD_SET(rip_sock, &fdbits);
587 if (sock_max <= rip_sock)
588 sock_max = rip_sock+1;
589 }
590 LIST_FOREACH(ifp, &ifnet, int_list) {
591 if (ifp->int_rip_sock >= 0) {
592 FD_SET(ifp->int_rip_sock, &fdbits);
593 if (sock_max <= ifp->int_rip_sock)
594 sock_max = ifp->int_rip_sock+1;
595 }
596 }
597 if (rdisc_sock >= 0) {
598 FD_SET(rdisc_sock, &fdbits);
599 if (sock_max <= rdisc_sock)
600 sock_max = rdisc_sock+1;
601 }
602 }
603
604
605 void
fix_sock(int sock,const char * name)606 fix_sock(int sock,
607 const char *name)
608 {
609 int on;
610 #define MIN_SOCKBUF (4*1024)
611 static int rbuf;
612
613 if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1)
614 logbad(1, "fcntl(%s) O_NONBLOCK: %s",
615 name, strerror(errno));
616 on = 1;
617 if (setsockopt(sock, SOL_SOCKET,SO_BROADCAST, &on,sizeof(on)) < 0)
618 msglog("setsockopt(%s,SO_BROADCAST): %s",
619 name, strerror(errno));
620 #ifdef USE_PASSIFNAME
621 on = 1;
622 if (setsockopt(sock, SOL_SOCKET, SO_PASSIFNAME, &on,sizeof(on)) < 0)
623 msglog("setsockopt(%s,SO_PASSIFNAME): %s",
624 name, strerror(errno));
625 #endif
626
627 if (rbuf >= MIN_SOCKBUF) {
628 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
629 &rbuf, sizeof(rbuf)) < 0)
630 msglog("setsockopt(%s,SO_RCVBUF=%d): %s",
631 name, rbuf, strerror(errno));
632 } else {
633 for (rbuf = 60*1024; ; rbuf -= 4096) {
634 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
635 &rbuf, sizeof(rbuf)) == 0) {
636 trace_act("RCVBUF=%d", rbuf);
637 break;
638 }
639 if (rbuf < MIN_SOCKBUF) {
640 msglog("setsockopt(%s,SO_RCVBUF = %d): %s",
641 name, rbuf, strerror(errno));
642 break;
643 }
644 }
645 }
646 }
647
648
649 /* get a rip socket
650 */
651 static int /* <0 or file descriptor */
get_rip_sock(naddr addr,int serious)652 get_rip_sock(naddr addr,
653 int serious) /* 1=failure to bind is serious */
654 {
655 struct sockaddr_in rsin;
656 unsigned char ttl;
657 int s;
658
659
660 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
661 BADERR(1,"rip_sock = socket()");
662
663 memset(&rsin, 0, sizeof(rsin));
664 #ifdef _HAVE_SIN_LEN
665 rsin.sin_len = sizeof(rsin);
666 #endif
667 rsin.sin_family = AF_INET;
668 rsin.sin_port = htons(RIP_PORT);
669 rsin.sin_addr.s_addr = addr;
670 if (bind(s, (struct sockaddr *)&rsin, sizeof(rsin)) < 0) {
671 if (serious)
672 BADERR(errno != EADDRINUSE, "bind(rip_sock)");
673 return -1;
674 }
675 fix_sock(s,"rip_sock");
676
677 ttl = 1;
678 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL,
679 &ttl, sizeof(ttl)) < 0)
680 DBGERR(1,"rip_sock setsockopt(IP_MULTICAST_TTL)");
681
682 return s;
683 }
684
685
686 /* turn off main RIP socket */
687 void
rip_off(void)688 rip_off(void)
689 {
690 struct interface *ifp;
691 naddr addr;
692
693
694 if (rip_sock >= 0 && !mhome) {
695 trace_act("turn off RIP");
696
697 (void)close(rip_sock);
698 rip_sock = -1;
699
700 /* get non-broadcast sockets to listen to queries.
701 */
702 LIST_FOREACH(ifp, &ifnet, int_list) {
703 if (ifp->int_state & IS_REMOTE)
704 continue;
705 if (ifp->int_rip_sock < 0) {
706 addr = ((ifp->int_if_flags & IFF_POINTOPOINT)
707 ? ifp->int_dstaddr
708 : ifp->int_addr);
709 ifp->int_rip_sock = get_rip_sock(addr, 0);
710 }
711 }
712
713 fix_select();
714
715 age(0);
716 }
717 }
718
719
720 /* turn on RIP multicast input via an interface
721 */
722 static void
rip_mcast_on(struct interface * ifp)723 rip_mcast_on(struct interface *ifp)
724 {
725 struct group_req gr;
726 struct sockaddr_in *sin;
727
728 if (!IS_RIP_IN_OFF(ifp->int_state)
729 && (ifp->int_if_flags & IFF_MULTICAST)
730 && !(ifp->int_state & IS_ALIAS)) {
731 memset(&gr, 0, sizeof(gr));
732 gr.gr_interface = ifp->int_index;
733 sin = (struct sockaddr_in *)&gr.gr_group;
734 sin->sin_family = AF_INET;
735 #ifdef _HAVE_SIN_LEN
736 sin->sin_len = sizeof(struct sockaddr_in);
737 #endif
738 sin->sin_addr.s_addr = htonl(INADDR_RIP_GROUP);
739 if (setsockopt(rip_sock, IPPROTO_IP, MCAST_JOIN_GROUP,
740 &gr, sizeof(gr)) < 0)
741 LOGERR("setsockopt(MCAST_JOIN_GROUP RIP)");
742 }
743 }
744
745
746 /* Prepare socket used for RIP.
747 */
748 void
rip_on(struct interface * ifp)749 rip_on(struct interface *ifp)
750 {
751 /* If the main RIP socket is already alive, only start receiving
752 * multicasts for this interface.
753 */
754 if (rip_sock >= 0) {
755 if (ifp != 0)
756 rip_mcast_on(ifp);
757 return;
758 }
759
760 /* If the main RIP socket is off and it makes sense to turn it on,
761 * then turn it on for all of the interfaces.
762 * It makes sense if either router discovery is off, or if
763 * router discover is on and at most one interface is doing RIP.
764 */
765 if (rip_interfaces > 0 && (!rdisc_ok || rip_interfaces > 1)) {
766 trace_act("turn on RIP");
767
768 /* Close all of the query sockets so that we can open
769 * the main socket. SO_REUSEPORT is not a solution,
770 * since that would let two daemons bind to the broadcast
771 * socket.
772 */
773 LIST_FOREACH(ifp, &ifnet, int_list) {
774 if (ifp->int_rip_sock >= 0) {
775 (void)close(ifp->int_rip_sock);
776 ifp->int_rip_sock = -1;
777 }
778 }
779
780 rip_sock = get_rip_sock(INADDR_ANY, 1);
781 rip_sock_mcast = 0;
782
783 /* Do not advertise anything until we have heard something
784 */
785 if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME)
786 next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME;
787
788 LIST_FOREACH(ifp, &ifnet, int_list) {
789 ifp->int_query_time = NEVER;
790 rip_mcast_on(ifp);
791 }
792 ifinit_timer.tv_sec = now.tv_sec;
793
794 } else if (ifp != 0
795 && !(ifp->int_state & IS_REMOTE)
796 && ifp->int_rip_sock < 0) {
797 /* RIP is off, so ensure there are sockets on which
798 * to listen for queries.
799 */
800 ifp->int_rip_sock = get_rip_sock(ifp->int_addr, 0);
801 }
802
803 fix_select();
804 }
805
806
807 /* die if malloc(3) fails
808 */
809 void *
rtmalloc(size_t size,const char * msg)810 rtmalloc(size_t size,
811 const char *msg)
812 {
813 void *p = malloc(size);
814 if (p == 0)
815 logbad(1,"malloc(%lu) failed in %s", (u_long)size, msg);
816 return p;
817 }
818
819
820 /* get a random instant in an interval
821 */
822 void
intvl_random(struct timeval * tp,u_long lo,u_long hi)823 intvl_random(struct timeval *tp, /* put value here */
824 u_long lo, /* value is after this second */
825 u_long hi) /* and before this */
826 {
827 tp->tv_sec = (time_t)(hi == lo
828 ? lo
829 : (lo + random() % ((hi - lo))));
830 tp->tv_usec = random() % 1000000;
831 }
832
833
834 void
timevaladd(struct timeval * t1,struct timeval * t2)835 timevaladd(struct timeval *t1,
836 struct timeval *t2)
837 {
838
839 t1->tv_sec += t2->tv_sec;
840 if ((t1->tv_usec += t2->tv_usec) >= 1000000) {
841 t1->tv_sec++;
842 t1->tv_usec -= 1000000;
843 }
844 }
845
846
847 /* t1 = t2 - t3
848 */
849 static void
timevalsub(struct timeval * t1,struct timeval * t2,struct timeval * t3)850 timevalsub(struct timeval *t1,
851 struct timeval *t2,
852 struct timeval *t3)
853 {
854 t1->tv_sec = t2->tv_sec - t3->tv_sec;
855 if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) {
856 t1->tv_sec--;
857 t1->tv_usec += 1000000;
858 }
859 }
860
861
862 /* put a message into the system log
863 */
864 void
msglog(const char * p,...)865 msglog(const char *p, ...)
866 {
867 va_list args;
868
869 trace_flush();
870
871 va_start(args, p);
872 vsyslog(LOG_ERR, p, args);
873 va_end(args);
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 va_end(args);
944 (void)fputc('\n', ftrace);
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 (void)fputs("routed: ", stderr);
960 va_start(args, p);
961 (void)vfprintf(stderr, p, args);
962 va_end(args);
963 (void)fputs("; giving up\n",stderr);
964 (void)fflush(stderr);
965
966 if (dump)
967 abort();
968 exit(1);
969 }
970