1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
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. 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 * $FreeBSD$
32 */
33
34 #include "defs.h"
35 #include "pathnames.h"
36 #include <signal.h>
37 #include <fcntl.h>
38 #include <sys/file.h>
39
40 __COPYRIGHT("@(#) Copyright (c) 1983, 1988, 1993 "
41 "The Regents of the University of California."
42 " All rights reserved.");
43 __RCSID("$FreeBSD$");
44
45 pid_t mypid;
46
47 naddr myaddr; /* system address */
48 static char myname[MAXHOSTNAMELEN+1];
49
50 static int verbose;
51
52 int supplier; /* supply or broadcast updates */
53 int supplier_set;
54 static int ipforwarding = 1; /* kernel forwarding on */
55
56 static int default_gateway; /* 1=advertise default */
57 static int background = 1;
58 int ridhosts; /* 1=reduce host routes */
59 int mhome; /* 1=want multi-homed host route */
60 int advertise_mhome; /* 1=must continue advertising it */
61 int auth_ok = 1; /* 1=ignore auth if we do not care */
62 int insecure; /* Reply to special queries or not */
63
64 struct timeval epoch; /* when started */
65 struct timeval clk;
66 static struct timeval prev_clk;
67 static int usec_fudge;
68 struct timeval now; /* current idea of time */
69 time_t now_stale;
70 time_t now_expire;
71 time_t now_garbage;
72
73 static struct timeval next_bcast; /* next general broadcast */
74 struct timeval no_flash = { /* inhibit flash update */
75 EPOCH+SUPPLY_INTERVAL, 0
76 };
77
78 static struct timeval flush_kern_timer;
79
80 static fd_set fdbits;
81 static int sock_max;
82 int rip_sock = -1; /* RIP socket */
83 const struct interface *rip_sock_mcast; /* current multicast interface */
84 int rt_sock; /* routing socket */
85 int rt_sock_seqno;
86
87
88 static int get_rip_sock(naddr, int);
89 static void timevalsub(struct timeval *, struct timeval *, struct timeval *);
90 static void sigalrm(int s UNUSED);
91 static void sigterm(int sig);
92
93 int
main(int argc,char * argv[])94 main(int argc,
95 char *argv[])
96 {
97 int n, mib[4], off;
98 size_t len;
99 char *p, *q;
100 const char *cp;
101 struct timeval wtime, t2;
102 time_t dt;
103 fd_set ibits;
104 naddr p_net, p_mask;
105 struct interface *ifp;
106 struct parm parm;
107 char *tracename = 0;
108
109
110 /* Some shells are badly broken and send SIGHUP to backgrounded
111 * processes.
112 */
113 signal(SIGHUP, SIG_IGN);
114
115 openlog("routed", LOG_PID, LOG_DAEMON);
116 ftrace = stdout;
117
118 gettimeofday(&clk, 0);
119 prev_clk = clk;
120 epoch = clk;
121 epoch.tv_sec -= EPOCH;
122 now.tv_sec = EPOCH;
123 now_stale = EPOCH - STALE_TIME;
124 now_expire = EPOCH - EXPIRE_TIME;
125 now_garbage = EPOCH - GARBAGE_TIME;
126 wtime.tv_sec = 0;
127
128 (void)gethostname(myname, sizeof(myname)-1);
129 (void)gethost(myname, &myaddr);
130
131 while ((n = getopt(argc, argv, "isqdghmAtvT:F:P:")) != -1) {
132 switch (n) {
133 case 'i':
134 insecure++;
135 break;
136 case 's':
137 supplier = 1;
138 supplier_set = 1;
139 break;
140
141 case 'q':
142 supplier = 0;
143 supplier_set = 1;
144 break;
145
146 case 'd':
147 background = 0;
148 break;
149
150 case 'g':
151 memset(&parm, 0, sizeof(parm));
152 parm.parm_d_metric = 1;
153 cp = check_parms(&parm);
154 if (cp != 0)
155 msglog("bad -g: %s", cp);
156 else
157 default_gateway = 1;
158 break;
159
160 case 'h': /* suppress extra host routes */
161 ridhosts = 1;
162 break;
163
164 case 'm': /* advertise host route */
165 mhome = 1; /* on multi-homed hosts */
166 break;
167
168 case 'A':
169 /* Ignore authentication if we do not care.
170 * Crazy as it is, that is what RFC 1723 requires.
171 */
172 auth_ok = 0;
173 break;
174
175 case 't':
176 new_tracelevel++;
177 break;
178
179 case 'T':
180 tracename = optarg;
181 break;
182
183 case 'F': /* minimal routes for SLIP */
184 n = FAKE_METRIC;
185 p = strchr(optarg,',');
186 if (p && *p != '\0') {
187 n = (int)strtoul(p+1, &q, 0);
188 if (*q == '\0'
189 && n <= HOPCNT_INFINITY-1
190 && n >= 1)
191 *p = '\0';
192 }
193 if (!getnet(optarg, &p_net, &p_mask)) {
194 msglog("bad network; \"-F %s\"",
195 optarg);
196 break;
197 }
198 memset(&parm, 0, sizeof(parm));
199 parm.parm_net = p_net;
200 parm.parm_mask = p_mask;
201 parm.parm_d_metric = n;
202 cp = check_parms(&parm);
203 if (cp != 0)
204 msglog("bad -F: %s", cp);
205 break;
206
207 case 'P':
208 /* handle arbitrary parameters.
209 */
210 q = strdup(optarg);
211 cp = parse_parms(q, 0);
212 if (cp != 0)
213 msglog("%s in \"-P %s\"", cp, optarg);
214 free(q);
215 break;
216
217 case 'v':
218 /* display version */
219 verbose++;
220 msglog("version 2.31");
221 break;
222
223 default:
224 goto usage;
225 }
226 }
227 argc -= optind;
228 argv += optind;
229
230 if (tracename == 0 && argc >= 1) {
231 tracename = *argv++;
232 argc--;
233 }
234 if (tracename != 0 && tracename[0] == '\0')
235 goto usage;
236 if (argc != 0) {
237 usage:
238 logbad(0, "usage: routed [-sqdghmAtv] [-T tracefile]"
239 " [-F net[,metric]] [-P parms]");
240 }
241 if (geteuid() != 0) {
242 if (verbose)
243 exit(0);
244 logbad(0, "requires UID 0");
245 }
246
247 mib[0] = CTL_NET;
248 mib[1] = PF_INET;
249 mib[2] = IPPROTO_IP;
250 mib[3] = IPCTL_FORWARDING;
251 len = sizeof(ipforwarding);
252 if (sysctl(mib, 4, &ipforwarding, &len, 0, 0) < 0)
253 LOGERR("sysctl(IPCTL_FORWARDING)");
254
255 if (!ipforwarding) {
256 if (supplier)
257 msglog("-s incompatible with ipforwarding=0");
258 if (default_gateway) {
259 msglog("-g incompatible with ipforwarding=0");
260 default_gateway = 0;
261 }
262 supplier = 0;
263 supplier_set = 1;
264 }
265 if (default_gateway) {
266 if (supplier_set && !supplier) {
267 msglog("-g and -q incompatible");
268 } else {
269 supplier = 1;
270 supplier_set = 1;
271 }
272 }
273
274
275 signal(SIGALRM, sigalrm);
276 if (!background)
277 signal(SIGHUP, sigterm); /* SIGHUP fatal during debugging */
278 signal(SIGTERM, sigterm);
279 signal(SIGINT, sigterm);
280 signal(SIGUSR1, sigtrace_on);
281 signal(SIGUSR2, sigtrace_off);
282
283 /* get into the background */
284 if (background && daemon(0, 1) < 0)
285 BADERR(0,"daemon()");
286
287 mypid = getpid();
288
289 /* prepare socket connected to the kernel.
290 */
291 rt_sock = socket(AF_ROUTE, SOCK_RAW, 0);
292 if (rt_sock < 0)
293 BADERR(1,"rt_sock = socket()");
294 if (fcntl(rt_sock, F_SETFL, O_NONBLOCK) == -1)
295 logbad(1, "fcntl(rt_sock) O_NONBLOCK: %s", strerror(errno));
296 off = 0;
297 if (setsockopt(rt_sock, SOL_SOCKET,SO_USELOOPBACK,
298 &off,sizeof(off)) < 0)
299 LOGERR("setsockopt(SO_USELOOPBACK,0)");
300
301 fix_select();
302
303
304 if (tracename != 0) {
305 strncpy(inittracename, tracename, sizeof(inittracename)-1);
306 set_tracefile(inittracename, "%s", -1);
307 } else {
308 tracelevel_msg("%s", -1); /* turn on tracing to stdio */
309 }
310
311 bufinit();
312
313 /* initialize radix tree */
314 rtinit();
315
316 /* Pick a random part of the second for our output to minimize
317 * collisions.
318 *
319 * Start broadcasting after hearing from other routers, and
320 * at a random time so a bunch of systems do not get synchronized
321 * after a power failure.
322 */
323 intvl_random(&next_bcast, EPOCH+MIN_WAITTIME, EPOCH+SUPPLY_INTERVAL);
324 age_timer.tv_usec = next_bcast.tv_usec;
325 age_timer.tv_sec = EPOCH+MIN_WAITTIME;
326 rdisc_timer = next_bcast;
327 ifinit_timer.tv_usec = next_bcast.tv_usec;
328
329 /* Collect an initial view of the world by checking the interface
330 * configuration and the kludge file.
331 */
332 gwkludge();
333 ifinit();
334
335 /* Ask for routes */
336 rip_query();
337 rdisc_sol();
338
339 /* Now turn off stdio if not tracing */
340 if (new_tracelevel == 0)
341 trace_close(background);
342
343 /* Loop forever, listening and broadcasting.
344 */
345 for (;;) {
346 prev_clk = clk;
347 gettimeofday(&clk, 0);
348 if (prev_clk.tv_sec == clk.tv_sec
349 && prev_clk.tv_usec == clk.tv_usec+usec_fudge) {
350 /* Much of `routed` depends on time always advancing.
351 * On systems that do not guarantee that gettimeofday()
352 * produces unique timestamps even if called within
353 * a single tick, use trickery like that in classic
354 * BSD kernels.
355 */
356 clk.tv_usec += ++usec_fudge;
357
358 } else {
359 usec_fudge = 0;
360
361 timevalsub(&t2, &clk, &prev_clk);
362 if (t2.tv_sec < 0
363 || t2.tv_sec > wtime.tv_sec + 5) {
364 /* Deal with time changes before other
365 * housekeeping to keep everything straight.
366 */
367 dt = t2.tv_sec;
368 if (dt > 0)
369 dt -= wtime.tv_sec;
370 trace_act("time changed by %d sec", (int)dt);
371 epoch.tv_sec += dt;
372 }
373 }
374 timevalsub(&now, &clk, &epoch);
375 now_stale = now.tv_sec - STALE_TIME;
376 now_expire = now.tv_sec - EXPIRE_TIME;
377 now_garbage = now.tv_sec - GARBAGE_TIME;
378
379 /* deal with signals that should affect tracing */
380 set_tracelevel();
381
382 if (stopint != 0) {
383 rip_bcast(0);
384 rdisc_adv();
385 trace_off("exiting with signal %d", stopint);
386 exit(stopint | 128);
387 }
388
389 /* look for new or dead interfaces */
390 timevalsub(&wtime, &ifinit_timer, &now);
391 if (wtime.tv_sec <= 0) {
392 wtime.tv_sec = 0;
393 ifinit();
394 rip_query();
395 continue;
396 }
397
398 /* Check the kernel table occasionally for mysteriously
399 * evaporated routes
400 */
401 timevalsub(&t2, &flush_kern_timer, &now);
402 if (t2.tv_sec <= 0) {
403 flush_kern();
404 flush_kern_timer.tv_sec = (now.tv_sec
405 + CHECK_QUIET_INTERVAL);
406 continue;
407 }
408 if (timercmp(&t2, &wtime, <))
409 wtime = t2;
410
411 /* If it is time, then broadcast our routes.
412 */
413 if (supplier || advertise_mhome) {
414 timevalsub(&t2, &next_bcast, &now);
415 if (t2.tv_sec <= 0) {
416 /* Synchronize the aging and broadcast
417 * timers to minimize awakenings
418 */
419 age(0);
420
421 rip_bcast(0);
422
423 /* It is desirable to send routing updates
424 * regularly. So schedule the next update
425 * 30 seconds after the previous one was
426 * scheduled, instead of 30 seconds after
427 * the previous update was finished.
428 * Even if we just started after discovering
429 * a 2nd interface or were otherwise delayed,
430 * pick a 30-second anniversary of the
431 * original broadcast time.
432 */
433 n = 1 + (0-t2.tv_sec)/SUPPLY_INTERVAL;
434 next_bcast.tv_sec += n*SUPPLY_INTERVAL;
435
436 continue;
437 }
438
439 if (timercmp(&t2, &wtime, <))
440 wtime = t2;
441 }
442
443 /* If we need a flash update, either do it now or
444 * set the delay to end when it is time.
445 *
446 * If we are within MIN_WAITTIME seconds of a full update,
447 * do not bother.
448 */
449 if (need_flash
450 && supplier
451 && no_flash.tv_sec+MIN_WAITTIME < next_bcast.tv_sec) {
452 /* accurate to the millisecond */
453 if (!timercmp(&no_flash, &now, >))
454 rip_bcast(1);
455 timevalsub(&t2, &no_flash, &now);
456 if (timercmp(&t2, &wtime, <))
457 wtime = t2;
458 }
459
460 /* trigger the main aging timer.
461 */
462 timevalsub(&t2, &age_timer, &now);
463 if (t2.tv_sec <= 0) {
464 age(0);
465 continue;
466 }
467 if (timercmp(&t2, &wtime, <))
468 wtime = t2;
469
470 /* update the kernel routing table
471 */
472 timevalsub(&t2, &need_kern, &now);
473 if (t2.tv_sec <= 0) {
474 age(0);
475 continue;
476 }
477 if (timercmp(&t2, &wtime, <))
478 wtime = t2;
479
480 /* take care of router discovery,
481 * but do it in the correct the millisecond
482 */
483 if (!timercmp(&rdisc_timer, &now, >)) {
484 rdisc_age(0);
485 continue;
486 }
487 timevalsub(&t2, &rdisc_timer, &now);
488 if (timercmp(&t2, &wtime, <))
489 wtime = t2;
490
491
492 /* wait for input or a timer to expire.
493 */
494 trace_flush();
495 ibits = fdbits;
496 n = select(sock_max, &ibits, 0, 0, &wtime);
497 if (n <= 0) {
498 if (n < 0 && errno != EINTR && errno != EAGAIN)
499 BADERR(1,"select");
500 continue;
501 }
502
503 if (FD_ISSET(rt_sock, &ibits)) {
504 read_rt();
505 n--;
506 }
507 if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, &ibits)) {
508 read_d();
509 n--;
510 }
511 if (rip_sock >= 0 && FD_ISSET(rip_sock, &ibits)) {
512 read_rip(rip_sock, 0);
513 n--;
514 }
515
516 LIST_FOREACH(ifp, &ifnet, int_list) {
517 if (n <= 0)
518 break;
519 if (ifp->int_rip_sock >= 0
520 && FD_ISSET(ifp->int_rip_sock, &ibits)) {
521 read_rip(ifp->int_rip_sock, ifp);
522 n--;
523 }
524 }
525 }
526 }
527
528
529 /* ARGSUSED */
530 static void
sigalrm(int s UNUSED)531 sigalrm(int s UNUSED)
532 {
533 /* Historically, SIGALRM would cause the daemon to check for
534 * new and broken interfaces.
535 */
536 ifinit_timer.tv_sec = now.tv_sec;
537 trace_act("SIGALRM");
538 }
539
540
541 /* watch for fatal signals */
542 static void
sigterm(int sig)543 sigterm(int sig)
544 {
545 stopint = sig;
546 (void)signal(sig, SIG_DFL); /* catch it only once */
547 }
548
549
550 void
fix_select(void)551 fix_select(void)
552 {
553 struct interface *ifp;
554
555
556 FD_ZERO(&fdbits);
557 sock_max = 0;
558
559 FD_SET(rt_sock, &fdbits);
560 if (sock_max <= rt_sock)
561 sock_max = rt_sock+1;
562 if (rip_sock >= 0) {
563 FD_SET(rip_sock, &fdbits);
564 if (sock_max <= rip_sock)
565 sock_max = rip_sock+1;
566 }
567 LIST_FOREACH(ifp, &ifnet, int_list) {
568 if (ifp->int_rip_sock >= 0) {
569 FD_SET(ifp->int_rip_sock, &fdbits);
570 if (sock_max <= ifp->int_rip_sock)
571 sock_max = ifp->int_rip_sock+1;
572 }
573 }
574 if (rdisc_sock >= 0) {
575 FD_SET(rdisc_sock, &fdbits);
576 if (sock_max <= rdisc_sock)
577 sock_max = rdisc_sock+1;
578 }
579 }
580
581
582 void
fix_sock(int sock,const char * name)583 fix_sock(int sock,
584 const char *name)
585 {
586 int on;
587 #define MIN_SOCKBUF (4*1024)
588 static int rbuf;
589
590 if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1)
591 logbad(1, "fcntl(%s) O_NONBLOCK: %s",
592 name, strerror(errno));
593 on = 1;
594 if (setsockopt(sock, SOL_SOCKET,SO_BROADCAST, &on,sizeof(on)) < 0)
595 msglog("setsockopt(%s,SO_BROADCAST): %s",
596 name, strerror(errno));
597 #ifdef USE_PASSIFNAME
598 on = 1;
599 if (setsockopt(sock, SOL_SOCKET, SO_PASSIFNAME, &on,sizeof(on)) < 0)
600 msglog("setsockopt(%s,SO_PASSIFNAME): %s",
601 name, strerror(errno));
602 #endif
603
604 if (rbuf >= MIN_SOCKBUF) {
605 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
606 &rbuf, sizeof(rbuf)) < 0)
607 msglog("setsockopt(%s,SO_RCVBUF=%d): %s",
608 name, rbuf, strerror(errno));
609 } else {
610 for (rbuf = 60*1024; ; rbuf -= 4096) {
611 if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
612 &rbuf, sizeof(rbuf)) == 0) {
613 trace_act("RCVBUF=%d", rbuf);
614 break;
615 }
616 if (rbuf < MIN_SOCKBUF) {
617 msglog("setsockopt(%s,SO_RCVBUF = %d): %s",
618 name, rbuf, strerror(errno));
619 break;
620 }
621 }
622 }
623 }
624
625
626 /* get a rip socket
627 */
628 static int /* <0 or file descriptor */
get_rip_sock(naddr addr,int serious)629 get_rip_sock(naddr addr,
630 int serious) /* 1=failure to bind is serious */
631 {
632 struct sockaddr_in rsin;
633 unsigned char ttl;
634 int s;
635
636
637 if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
638 BADERR(1,"rip_sock = socket()");
639
640 memset(&rsin, 0, sizeof(rsin));
641 #ifdef _HAVE_SIN_LEN
642 rsin.sin_len = sizeof(rsin);
643 #endif
644 rsin.sin_family = AF_INET;
645 rsin.sin_port = htons(RIP_PORT);
646 rsin.sin_addr.s_addr = addr;
647 if (bind(s, (struct sockaddr *)&rsin, sizeof(rsin)) < 0) {
648 if (serious)
649 BADERR(errno != EADDRINUSE, "bind(rip_sock)");
650 close(s);
651 return -1;
652 }
653 fix_sock(s,"rip_sock");
654
655 ttl = 1;
656 if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL,
657 &ttl, sizeof(ttl)) < 0)
658 DBGERR(1,"rip_sock setsockopt(IP_MULTICAST_TTL)");
659
660 return s;
661 }
662
663
664 /* turn off main RIP socket */
665 void
rip_off(void)666 rip_off(void)
667 {
668 struct interface *ifp;
669 naddr addr;
670
671
672 if (rip_sock >= 0 && !mhome) {
673 trace_act("turn off RIP");
674
675 (void)close(rip_sock);
676 rip_sock = -1;
677
678 /* get non-broadcast sockets to listen to queries.
679 */
680 LIST_FOREACH(ifp, &ifnet, int_list) {
681 if (ifp->int_state & IS_REMOTE)
682 continue;
683 if (ifp->int_rip_sock < 0) {
684 addr = ((ifp->int_if_flags & IFF_POINTOPOINT)
685 ? ifp->int_dstaddr
686 : ifp->int_addr);
687 ifp->int_rip_sock = get_rip_sock(addr, 0);
688 }
689 }
690
691 fix_select();
692
693 age(0);
694 }
695 }
696
697
698 /* turn on RIP multicast input via an interface
699 */
700 static void
rip_mcast_on(struct interface * ifp)701 rip_mcast_on(struct interface *ifp)
702 {
703 struct group_req gr;
704 struct sockaddr_in *sin;
705
706 if (!IS_RIP_IN_OFF(ifp->int_state)
707 && (ifp->int_if_flags & IFF_MULTICAST)
708 && !(ifp->int_state & IS_ALIAS)) {
709 memset(&gr, 0, sizeof(gr));
710 gr.gr_interface = ifp->int_index;
711 sin = (struct sockaddr_in *)&gr.gr_group;
712 sin->sin_family = AF_INET;
713 #ifdef _HAVE_SIN_LEN
714 sin->sin_len = sizeof(struct sockaddr_in);
715 #endif
716 sin->sin_addr.s_addr = htonl(INADDR_RIP_GROUP);
717 if (setsockopt(rip_sock, IPPROTO_IP, MCAST_JOIN_GROUP,
718 &gr, sizeof(gr)) < 0)
719 LOGERR("setsockopt(MCAST_JOIN_GROUP RIP)");
720 }
721 }
722
723
724 /* Prepare socket used for RIP.
725 */
726 void
rip_on(struct interface * ifp)727 rip_on(struct interface *ifp)
728 {
729 /* If the main RIP socket is already alive, only start receiving
730 * multicasts for this interface.
731 */
732 if (rip_sock >= 0) {
733 if (ifp != NULL)
734 rip_mcast_on(ifp);
735 return;
736 }
737
738 /* If the main RIP socket is off and it makes sense to turn it on,
739 * then turn it on for all of the interfaces.
740 * It makes sense if either router discovery is off, or if
741 * router discover is on and at most one interface is doing RIP.
742 */
743 if (rip_interfaces > 0 && (!rdisc_ok || rip_interfaces > 1)) {
744 trace_act("turn on RIP");
745
746 /* Close all of the query sockets so that we can open
747 * the main socket. SO_REUSEPORT is not a solution,
748 * since that would let two daemons bind to the broadcast
749 * socket.
750 */
751 LIST_FOREACH(ifp, &ifnet, int_list) {
752 if (ifp->int_rip_sock >= 0) {
753 (void)close(ifp->int_rip_sock);
754 ifp->int_rip_sock = -1;
755 }
756 }
757
758 rip_sock = get_rip_sock(INADDR_ANY, 1);
759 rip_sock_mcast = NULL;
760
761 /* Do not advertise anything until we have heard something
762 */
763 if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME)
764 next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME;
765
766 LIST_FOREACH(ifp, &ifnet, int_list) {
767 ifp->int_query_time = NEVER;
768 rip_mcast_on(ifp);
769 }
770 ifinit_timer.tv_sec = now.tv_sec;
771
772 } else if (ifp != NULL
773 && !(ifp->int_state & IS_REMOTE)
774 && ifp->int_rip_sock < 0) {
775 /* RIP is off, so ensure there are sockets on which
776 * to listen for queries.
777 */
778 ifp->int_rip_sock = get_rip_sock(ifp->int_addr, 0);
779 }
780
781 fix_select();
782 }
783
784
785 /* die if malloc(3) fails
786 */
787 void *
rtmalloc(size_t size,const char * msg)788 rtmalloc(size_t size,
789 const char *msg)
790 {
791 void *p = malloc(size);
792 if (p == NULL)
793 logbad(1,"malloc(%lu) failed in %s", (u_long)size, msg);
794 return p;
795 }
796
797
798 /* get a random instant in an interval
799 */
800 void
intvl_random(struct timeval * tp,u_long lo,u_long hi)801 intvl_random(struct timeval *tp, /* put value here */
802 u_long lo, /* value is after this second */
803 u_long hi) /* and before this */
804 {
805 tp->tv_sec = (time_t)(hi == lo
806 ? lo
807 : (lo + arc4random_uniform(1 + hi - lo)));
808 tp->tv_usec = arc4random_uniform(1000000);
809 }
810
811
812 void
timevaladd(struct timeval * t1,struct timeval * t2)813 timevaladd(struct timeval *t1,
814 struct timeval *t2)
815 {
816
817 t1->tv_sec += t2->tv_sec;
818 if ((t1->tv_usec += t2->tv_usec) >= 1000000) {
819 t1->tv_sec++;
820 t1->tv_usec -= 1000000;
821 }
822 }
823
824
825 /* t1 = t2 - t3
826 */
827 static void
timevalsub(struct timeval * t1,struct timeval * t2,struct timeval * t3)828 timevalsub(struct timeval *t1,
829 struct timeval *t2,
830 struct timeval *t3)
831 {
832 t1->tv_sec = t2->tv_sec - t3->tv_sec;
833 if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) {
834 t1->tv_sec--;
835 t1->tv_usec += 1000000;
836 }
837 }
838
839
840 /* put a message into the system log
841 */
842 void
msglog(const char * p,...)843 msglog(const char *p, ...)
844 {
845 va_list args;
846
847 trace_flush();
848
849 va_start(args, p);
850 vsyslog(LOG_ERR, p, args);
851 va_end(args);
852 if (ftrace != NULL) {
853 if (ftrace == stdout)
854 (void)fputs("routed: ", ftrace);
855 va_start(args, p);
856 (void)vfprintf(ftrace, p, args);
857 va_end(args);
858 (void)fputc('\n', ftrace);
859 }
860 }
861
862
863 /* Put a message about a bad system into the system log if
864 * we have not complained about it recently.
865 *
866 * It is desirable to complain about all bad systems, but not too often.
867 * In the worst case, it is not practical to keep track of all bad systems.
868 * For example, there can be many systems with the wrong password.
869 */
870 void
msglim(struct msg_limit * lim,naddr addr,const char * p,...)871 msglim(struct msg_limit *lim, naddr addr, const char *p, ...)
872 {
873 va_list args;
874 int i;
875 struct msg_sub *ms1, *ms;
876 const char *p1;
877
878 /* look for the oldest slot in the table
879 * or the slot for the bad router.
880 */
881 ms = ms1 = lim->subs;
882 for (i = MSG_SUBJECT_N; ; i--, ms1++) {
883 if (i == 0) {
884 /* Reuse a slot at most once every 10 minutes.
885 */
886 if (lim->reuse > now.tv_sec) {
887 ms = NULL;
888 } else {
889 ms = ms1;
890 lim->reuse = now.tv_sec + 10*60;
891 }
892 break;
893 }
894 if (ms->addr == addr) {
895 /* Repeat a complaint about a given system at
896 * most once an hour.
897 */
898 if (ms->until > now.tv_sec)
899 ms = NULL;
900 break;
901 }
902 if (ms->until < ms1->until)
903 ms = ms1;
904 }
905 if (ms != NULL) {
906 ms->addr = addr;
907 ms->until = now.tv_sec + 60*60; /* 60 minutes */
908
909 trace_flush();
910 for (p1 = p; *p1 == ' '; p1++)
911 continue;
912 va_start(args, p);
913 vsyslog(LOG_ERR, p1, args);
914 va_end(args);
915 }
916
917 /* always display the message if tracing */
918 if (ftrace != NULL) {
919 va_start(args, p);
920 (void)vfprintf(ftrace, p, args);
921 va_end(args);
922 (void)fputc('\n', ftrace);
923 }
924 }
925
926
927 void
logbad(int dump,const char * p,...)928 logbad(int dump, const char *p, ...)
929 {
930 va_list args;
931
932 trace_flush();
933
934 va_start(args, p);
935 vsyslog(LOG_ERR, p, args);
936 va_end(args);
937 (void)fputs("routed: ", stderr);
938 va_start(args, p);
939 (void)vfprintf(stderr, p, args);
940 va_end(args);
941 (void)fputs("; giving up\n",stderr);
942 (void)fflush(stderr);
943
944 if (dump)
945 abort();
946 exit(1);
947 }
948