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