main.c revision 128073 
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: head/sbin/routed/main.c 128073 2004-04-09 19:58:40Z markm $
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\n"
42	    "The Regents of the University of California."
43	    "  All rights reserved.\n");
44#ifdef __NetBSD__
45__RCSID("$NetBSD$");
46#include <util.h>
47#elif defined(__FreeBSD__)
48__RCSID("$FreeBSD: head/sbin/routed/main.c 128073 2004-04-09 19:58:40Z markm $");
49#else
50__RCSID("$Revision: 2.27 $");
51#ident "$Revision: 2.27 $"
52#endif
53#ident "$FreeBSD: head/sbin/routed/main.c 128073 2004-04-09 19:58:40Z markm $"
54
55pid_t	mypid;
56
57naddr	myaddr;				/* system address */
58char	myname[MAXHOSTNAMELEN+1];
59
60int	verbose;
61
62int	supplier;			/* supply or broadcast updates */
63int	supplier_set;
64int	ipforwarding = 1;		/* kernel forwarding on */
65
66int	default_gateway;		/* 1=advertise default */
67int	background = 1;
68int	ridhosts;			/* 1=reduce host routes */
69int	mhome;				/* 1=want multi-homed host route */
70int	advertise_mhome;		/* 1=must continue advertising it */
71int	auth_ok = 1;			/* 1=ignore auth if we do not care */
72
73struct timeval epoch;			/* when started */
74struct timeval clk, prev_clk;
75static int usec_fudge;
76struct timeval now;			/* current idea of time */
77time_t	now_stale;
78time_t	now_expire;
79time_t	now_garbage;
80
81struct timeval next_bcast;		/* next general broadcast */
82struct timeval no_flash = {		/* inhibit flash update */
83	EPOCH+SUPPLY_INTERVAL, 0
84};
85
86struct timeval flush_kern_timer;
87
88fd_set	fdbits;
89int	sock_max;
90int	rip_sock = -1;			/* RIP socket */
91struct interface *rip_sock_mcast;	/* current multicast interface */
92int	rt_sock;			/* routing socket */
93int	rt_sock_seqno;
94
95
96static  int get_rip_sock(naddr, int);
97static void timevalsub(struct timeval *, struct timeval *, struct timeval *);
98
99int
100main(int argc,
101     char *argv[])
102{
103	int n, mib[4], off;
104	size_t len;
105	char *p, *q;
106	const char *cp;
107	struct timeval wtime, t2;
108	time_t dt;
109	fd_set ibits;
110	naddr p_net, p_mask;
111	struct interface *ifp;
112	struct parm parm;
113	char *tracename = 0;
114
115
116	/* Some shells are badly broken and send SIGHUP to backgrounded
117	 * processes.
118	 */
119	signal(SIGHUP, SIG_IGN);
120
121	openlog("routed", LOG_PID, LOG_DAEMON);
122	ftrace = stdout;
123
124	gettimeofday(&clk, 0);
125	prev_clk = clk;
126	epoch = clk;
127	epoch.tv_sec -= EPOCH;
128	now.tv_sec = EPOCH;
129	now_stale = EPOCH - STALE_TIME;
130	now_expire = EPOCH - EXPIRE_TIME;
131	now_garbage = EPOCH - GARBAGE_TIME;
132	wtime.tv_sec = 0;
133
134	(void)gethostname(myname, sizeof(myname)-1);
135	(void)gethost(myname, &myaddr);
136
137	while ((n = getopt(argc, argv, "sqdghmpAtvT:F:P:")) != -1) {
138		switch (n) {
139		case 's':
140			supplier = 1;
141			supplier_set = 1;
142			break;
143
144		case 'q':
145			supplier = 0;
146			supplier_set = 1;
147			break;
148
149		case 'd':
150			background = 0;
151			break;
152
153		case 'g':
154			memset(&parm, 0, sizeof(parm));
155			parm.parm_d_metric = 1;
156			cp = check_parms(&parm);
157			if (cp != 0)
158				msglog("bad -g: %s", cp);
159			else
160				default_gateway = 1;
161			break;
162
163		case 'h':		/* suppress extra host routes */
164			ridhosts = 1;
165			break;
166
167		case 'm':		/* advertise host route */
168			mhome = 1;	/* on multi-homed hosts */
169			break;
170
171		case 'A':
172			/* Ignore authentication if we do not care.
173			 * Crazy as it is, that is what RFC 1723 requires.
174			 */
175			auth_ok = 0;
176			break;
177
178		case 't':
179			new_tracelevel++;
180			break;
181
182		case 'T':
183			tracename = optarg;
184			break;
185
186		case 'F':		/* minimal routes for SLIP */
187			n = FAKE_METRIC;
188			p = strchr(optarg,',');
189			if (p && *p != '\0') {
190				n = (int)strtoul(p+1, &q, 0);
191				if (*q == '\0'
192				    && n <= HOPCNT_INFINITY-1
193				    && n >= 1)
194					*p = '\0';
195			}
196			if (!getnet(optarg, &p_net, &p_mask)) {
197				msglog("bad network; \"-F %s\"",
198				       optarg);
199				break;
200			}
201			memset(&parm, 0, sizeof(parm));
202			parm.parm_net = p_net;
203			parm.parm_mask = p_mask;
204			parm.parm_d_metric = n;
205			cp = check_parms(&parm);
206			if (cp != 0)
207				msglog("bad -F: %s", cp);
208			break;
209
210		case 'P':
211			/* handle arbitrary parameters.
212			 */
213			q = strdup(optarg);
214			cp = parse_parms(q, 0);
215			if (cp != 0)
216				msglog("%s in \"-P %s\"", cp, optarg);
217			free(q);
218			break;
219
220		case 'v':
221			/* display version */
222			verbose++;
223			msglog("version 2.25");
224			break;
225
226		default:
227			goto usage;
228		}
229	}
230	argc -= optind;
231	argv += optind;
232
233	if (tracename == 0 && argc >= 1) {
234		tracename = *argv++;
235		argc--;
236	}
237	if (tracename != 0 && tracename[0] == '\0')
238		goto usage;
239	if (argc != 0) {
240usage:
241		logbad(0, "usage: routed [-sqdghmpAtv] [-T tracefile]"
242		       " [-F net[,metric]] [-P parms]");
243	}
244	if (geteuid() != 0) {
245		if (verbose)
246			exit(0);
247		logbad(0, "requires UID 0");
248	}
249
250	mib[0] = CTL_NET;
251	mib[1] = PF_INET;
252	mib[2] = IPPROTO_IP;
253	mib[3] = IPCTL_FORWARDING;
254	len = sizeof(ipforwarding);
255	if (sysctl(mib, 4, &ipforwarding, &len, 0, 0) < 0)
256		LOGERR("sysctl(IPCTL_FORWARDING)");
257
258	if (!ipforwarding) {
259		if (supplier)
260			msglog("-s incompatible with ipforwarding=0");
261		if (default_gateway) {
262			msglog("-g incompatible with ipforwarding=0");
263			default_gateway = 0;
264		}
265		supplier = 0;
266		supplier_set = 1;
267	}
268	if (default_gateway) {
269		if (supplier_set && !supplier) {
270			msglog("-g and -q incompatible");
271		} else {
272			supplier = 1;
273			supplier_set = 1;
274		}
275	}
276
277
278	signal(SIGALRM, sigalrm);
279	if (!background)
280		signal(SIGHUP, sigterm);    /* SIGHUP fatal during debugging */
281	signal(SIGTERM, sigterm);
282	signal(SIGINT, sigterm);
283	signal(SIGUSR1, sigtrace_on);
284	signal(SIGUSR2, sigtrace_off);
285
286	/* get into the background */
287#ifdef sgi
288	if (0 > _daemonize(background ? 0 : (_DF_NOCHDIR|_DF_NOFORK),
289			   STDIN_FILENO, STDOUT_FILENO, STDERR_FILENO))
290		BADERR(0, "_daemonize()");
291#else
292	if (background && daemon(0, 1) < 0)
293		BADERR(0,"daemon()");
294#endif
295
296#if defined(__NetBSD__)
297	pidfile(0);
298#endif
299	mypid = getpid();
300#ifdef __FreeBSD__
301	srandomdev();
302#else
303	srandom((int)(clk.tv_sec ^ clk.tv_usec ^ mypid));
304#endif
305
306	/* prepare socket connected to the kernel.
307	 */
308	rt_sock = socket(AF_ROUTE, SOCK_RAW, 0);
309	if (rt_sock < 0)
310		BADERR(1,"rt_sock = socket()");
311	if (fcntl(rt_sock, F_SETFL, O_NONBLOCK) == -1)
312		logbad(1, "fcntl(rt_sock) O_NONBLOCK: %s", strerror(errno));
313	off = 0;
314	if (setsockopt(rt_sock, SOL_SOCKET,SO_USELOOPBACK,
315		       &off,sizeof(off)) < 0)
316		LOGERR("setsockopt(SO_USELOOPBACK,0)");
317
318	fix_select();
319
320
321	if (tracename != 0) {
322		strncpy(inittracename, tracename, sizeof(inittracename)-1);
323		set_tracefile(inittracename, "%s", -1);
324	} else {
325		tracelevel_msg("%s", -1);   /* turn on tracing to stdio */
326	}
327
328	bufinit();
329
330	/* initialize radix tree */
331	rtinit();
332
333	/* Pick a random part of the second for our output to minimize
334	 * collisions.
335	 *
336	 * Start broadcasting after hearing from other routers, and
337	 * at a random time so a bunch of systems do not get synchronized
338	 * after a power failure.
339	 */
340	intvl_random(&next_bcast, EPOCH+MIN_WAITTIME, EPOCH+SUPPLY_INTERVAL);
341	age_timer.tv_usec = next_bcast.tv_usec;
342	age_timer.tv_sec = EPOCH+MIN_WAITTIME;
343	rdisc_timer = next_bcast;
344	ifinit_timer.tv_usec = next_bcast.tv_usec;
345
346	/* Collect an initial view of the world by checking the interface
347	 * configuration and the kludge file.
348	 */
349	gwkludge();
350	ifinit();
351
352	/* Ask for routes */
353	rip_query();
354	rdisc_sol();
355
356	/* Now turn off stdio if not tracing */
357	if (new_tracelevel == 0)
358		trace_close(background);
359
360	/* Loop forever, listening and broadcasting.
361	 */
362	for (;;) {
363		prev_clk = clk;
364		gettimeofday(&clk, 0);
365		if (prev_clk.tv_sec == clk.tv_sec
366		    && prev_clk.tv_usec == clk.tv_usec+usec_fudge) {
367			/* Much of `routed` depends on time always advancing.
368			 * On systems that do not guarantee that gettimeofday()
369			 * produces unique timestamps even if called within
370			 * a single tick, use trickery like that in classic
371			 * BSD kernels.
372			 */
373			clk.tv_usec += ++usec_fudge;
374
375		} else {
376			usec_fudge = 0;
377
378			timevalsub(&t2, &clk, &prev_clk);
379			if (t2.tv_sec < 0
380			    || t2.tv_sec > wtime.tv_sec + 5) {
381				/* Deal with time changes before other
382				 * housekeeping to keep everything straight.
383				 */
384				dt = t2.tv_sec;
385				if (dt > 0)
386					dt -= wtime.tv_sec;
387				trace_act("time changed by %d sec", (int)dt);
388				epoch.tv_sec += dt;
389			}
390		}
391		timevalsub(&now, &clk, &epoch);
392		now_stale = now.tv_sec - STALE_TIME;
393		now_expire = now.tv_sec - EXPIRE_TIME;
394		now_garbage = now.tv_sec - GARBAGE_TIME;
395
396		/* deal with signals that should affect tracing */
397		set_tracelevel();
398
399		if (stopint != 0) {
400			rip_bcast(0);
401			rdisc_adv();
402			trace_off("exiting with signal %d", stopint);
403			exit(stopint | 128);
404		}
405
406		/* look for new or dead interfaces */
407		timevalsub(&wtime, &ifinit_timer, &now);
408		if (wtime.tv_sec <= 0) {
409			wtime.tv_sec = 0;
410			ifinit();
411			rip_query();
412			continue;
413		}
414
415		/* Check the kernel table occassionally for mysteriously
416		 * evaporated routes
417		 */
418		timevalsub(&t2, &flush_kern_timer, &now);
419		if (t2.tv_sec <= 0) {
420			flush_kern();
421			flush_kern_timer.tv_sec = (now.tv_sec
422						   + CHECK_QUIET_INTERVAL);
423			continue;
424		}
425		if (timercmp(&t2, &wtime, <))
426			wtime = t2;
427
428		/* If it is time, then broadcast our routes.
429		 */
430		if (supplier || advertise_mhome) {
431			timevalsub(&t2, &next_bcast, &now);
432			if (t2.tv_sec <= 0) {
433				/* Synchronize the aging and broadcast
434				 * timers to minimize awakenings
435				 */
436				age(0);
437
438				rip_bcast(0);
439
440				/* It is desirable to send routing updates
441				 * regularly.  So schedule the next update
442				 * 30 seconds after the previous one was
443				 * scheduled, instead of 30 seconds after
444				 * the previous update was finished.
445				 * Even if we just started after discovering
446				 * a 2nd interface or were otherwise delayed,
447				 * pick a 30-second aniversary of the
448				 * original broadcast time.
449				 */
450				n = 1 + (0-t2.tv_sec)/SUPPLY_INTERVAL;
451				next_bcast.tv_sec += n*SUPPLY_INTERVAL;
452
453				continue;
454			}
455
456			if (timercmp(&t2, &wtime, <))
457				wtime = t2;
458		}
459
460		/* If we need a flash update, either do it now or
461		 * set the delay to end when it is time.
462		 *
463		 * If we are within MIN_WAITTIME seconds of a full update,
464		 * do not bother.
465		 */
466		if (need_flash
467		    && supplier
468		    && no_flash.tv_sec+MIN_WAITTIME < next_bcast.tv_sec) {
469			/* accurate to the millisecond */
470			if (!timercmp(&no_flash, &now, >))
471				rip_bcast(1);
472			timevalsub(&t2, &no_flash, &now);
473			if (timercmp(&t2, &wtime, <))
474				wtime = t2;
475		}
476
477		/* trigger the main aging timer.
478		 */
479		timevalsub(&t2, &age_timer, &now);
480		if (t2.tv_sec <= 0) {
481			age(0);
482			continue;
483		}
484		if (timercmp(&t2, &wtime, <))
485			wtime = t2;
486
487		/* update the kernel routing table
488		 */
489		timevalsub(&t2, &need_kern, &now);
490		if (t2.tv_sec <= 0) {
491			age(0);
492			continue;
493		}
494		if (timercmp(&t2, &wtime, <))
495			wtime = t2;
496
497		/* take care of router discovery,
498		 * but do it in the correct the millisecond
499		 */
500		if (!timercmp(&rdisc_timer, &now, >)) {
501			rdisc_age(0);
502			continue;
503		}
504		timevalsub(&t2, &rdisc_timer, &now);
505		if (timercmp(&t2, &wtime, <))
506			wtime = t2;
507
508
509		/* wait for input or a timer to expire.
510		 */
511		trace_flush();
512		ibits = fdbits;
513		n = select(sock_max, &ibits, 0, 0, &wtime);
514		if (n <= 0) {
515			if (n < 0 && errno != EINTR && errno != EAGAIN)
516				BADERR(1,"select");
517			continue;
518		}
519
520		if (FD_ISSET(rt_sock, &ibits)) {
521			read_rt();
522			n--;
523		}
524		if (rdisc_sock >= 0 && FD_ISSET(rdisc_sock, &ibits)) {
525			read_d();
526			n--;
527		}
528		if (rip_sock >= 0 && FD_ISSET(rip_sock, &ibits)) {
529			read_rip(rip_sock, 0);
530			n--;
531		}
532
533		for (ifp = ifnet; n > 0 && 0 != ifp; ifp = ifp->int_next) {
534			if (ifp->int_rip_sock >= 0
535			    && FD_ISSET(ifp->int_rip_sock, &ibits)) {
536				read_rip(ifp->int_rip_sock, ifp);
537				n--;
538			}
539		}
540	}
541}
542
543
544/* ARGSUSED */
545void
546sigalrm(int s UNUSED)
547{
548	/* Historically, SIGALRM would cause the daemon to check for
549	 * new and broken interfaces.
550	 */
551	ifinit_timer.tv_sec = now.tv_sec;
552	trace_act("SIGALRM");
553}
554
555
556/* watch for fatal signals */
557void
558sigterm(int sig)
559{
560	stopint = sig;
561	(void)signal(sig, SIG_DFL);	/* catch it only once */
562}
563
564
565void
566fix_select(void)
567{
568	struct interface *ifp;
569
570
571	FD_ZERO(&fdbits);
572	sock_max = 0;
573
574	FD_SET(rt_sock, &fdbits);
575	if (sock_max <= rt_sock)
576		sock_max = rt_sock+1;
577	if (rip_sock >= 0) {
578		FD_SET(rip_sock, &fdbits);
579		if (sock_max <= rip_sock)
580			sock_max = rip_sock+1;
581	}
582	for (ifp = ifnet; 0 != ifp; ifp = ifp->int_next) {
583		if (ifp->int_rip_sock >= 0) {
584			FD_SET(ifp->int_rip_sock, &fdbits);
585			if (sock_max <= ifp->int_rip_sock)
586				sock_max = ifp->int_rip_sock+1;
587		}
588	}
589	if (rdisc_sock >= 0) {
590		FD_SET(rdisc_sock, &fdbits);
591		if (sock_max <= rdisc_sock)
592			sock_max = rdisc_sock+1;
593	}
594}
595
596
597void
598fix_sock(int sock,
599	 const char *name)
600{
601	int on;
602#define MIN_SOCKBUF (4*1024)
603	static int rbuf;
604
605	if (fcntl(sock, F_SETFL, O_NONBLOCK) == -1)
606		logbad(1, "fcntl(%s) O_NONBLOCK: %s",
607		       name, strerror(errno));
608	on = 1;
609	if (setsockopt(sock, SOL_SOCKET,SO_BROADCAST, &on,sizeof(on)) < 0)
610		msglog("setsockopt(%s,SO_BROADCAST): %s",
611		       name, strerror(errno));
612#ifdef USE_PASSIFNAME
613	on = 1;
614	if (setsockopt(sock, SOL_SOCKET, SO_PASSIFNAME, &on,sizeof(on)) < 0)
615		msglog("setsockopt(%s,SO_PASSIFNAME): %s",
616		       name, strerror(errno));
617#endif
618
619	if (rbuf >= MIN_SOCKBUF) {
620		if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
621			       &rbuf, sizeof(rbuf)) < 0)
622			msglog("setsockopt(%s,SO_RCVBUF=%d): %s",
623			       name, rbuf, strerror(errno));
624	} else {
625		for (rbuf = 60*1024; ; rbuf -= 4096) {
626			if (setsockopt(sock, SOL_SOCKET, SO_RCVBUF,
627				       &rbuf, sizeof(rbuf)) == 0) {
628				trace_act("RCVBUF=%d", rbuf);
629				break;
630			}
631			if (rbuf < MIN_SOCKBUF) {
632				msglog("setsockopt(%s,SO_RCVBUF = %d): %s",
633				       name, rbuf, strerror(errno));
634				break;
635			}
636		}
637	}
638}
639
640
641/* get a rip socket
642 */
643static int				/* <0 or file descriptor */
644get_rip_sock(naddr addr,
645	     int serious)		/* 1=failure to bind is serious */
646{
647	struct sockaddr_in rsin;
648	unsigned char ttl;
649	int s;
650
651
652	if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0)
653		BADERR(1,"rip_sock = socket()");
654
655	memset(&rsin, 0, sizeof(rsin));
656#ifdef _HAVE_SIN_LEN
657	rsin.sin_len = sizeof(rsin);
658#endif
659	rsin.sin_family = AF_INET;
660	rsin.sin_port = htons(RIP_PORT);
661	rsin.sin_addr.s_addr = addr;
662	if (bind(s, (struct sockaddr *)&rsin, sizeof(rsin)) < 0) {
663		if (serious)
664			BADERR(errno != EADDRINUSE, "bind(rip_sock)");
665		return -1;
666	}
667	fix_sock(s,"rip_sock");
668
669	ttl = 1;
670	if (setsockopt(s, IPPROTO_IP, IP_MULTICAST_TTL,
671		       &ttl, sizeof(ttl)) < 0)
672		DBGERR(1,"rip_sock setsockopt(IP_MULTICAST_TTL)");
673
674	return s;
675}
676
677
678/* turn off main RIP socket */
679void
680rip_off(void)
681{
682	struct interface *ifp;
683	naddr addr;
684
685
686	if (rip_sock >= 0 && !mhome) {
687		trace_act("turn off RIP");
688
689		(void)close(rip_sock);
690		rip_sock = -1;
691
692		/* get non-broadcast sockets to listen to queries.
693		 */
694		for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) {
695			if (ifp->int_state & IS_REMOTE)
696				continue;
697			if (ifp->int_rip_sock < 0) {
698				addr = ((ifp->int_if_flags & IFF_POINTOPOINT)
699					? ifp->int_dstaddr
700					: ifp->int_addr);
701				ifp->int_rip_sock = get_rip_sock(addr, 0);
702			}
703		}
704
705		fix_select();
706
707		age(0);
708	}
709}
710
711
712/* turn on RIP multicast input via an interface
713 */
714static void
715rip_mcast_on(struct interface *ifp)
716{
717	struct ip_mreq m;
718
719	if (!IS_RIP_IN_OFF(ifp->int_state)
720	    && (ifp->int_if_flags & IFF_MULTICAST)
721#ifdef MCAST_PPP_BUG
722	    && !(ifp->int_if_flags & IFF_POINTOPOINT)
723#endif
724	    && !(ifp->int_state & IS_ALIAS)) {
725		m.imr_multiaddr.s_addr = htonl(INADDR_RIP_GROUP);
726#ifdef MCAST_IFINDEX
727		m.imr_interface.s_addr = htonl(ifp->int_index);
728#else
729		m.imr_interface.s_addr = ((ifp->int_if_flags & IFF_POINTOPOINT)
730					  ? ifp->int_dstaddr
731					  : ifp->int_addr);
732#endif
733		if (setsockopt(rip_sock,IPPROTO_IP, IP_ADD_MEMBERSHIP,
734			       &m, sizeof(m)) < 0)
735			LOGERR("setsockopt(IP_ADD_MEMBERSHIP RIP)");
736	}
737}
738
739
740/* Prepare socket used for RIP.
741 */
742void
743rip_on(struct interface *ifp)
744{
745	/* If the main RIP socket is already alive, only start receiving
746	 * multicasts for this interface.
747	 */
748	if (rip_sock >= 0) {
749		if (ifp != 0)
750			rip_mcast_on(ifp);
751		return;
752	}
753
754	/* If the main RIP socket is off and it makes sense to turn it on,
755	 * then turn it on for all of the interfaces.
756	 * It makes sense if either router discovery is off, or if
757	 * router discover is on and at most one interface is doing RIP.
758	 */
759	if (rip_interfaces > 0 && (!rdisc_ok || rip_interfaces > 1)) {
760		trace_act("turn on RIP");
761
762		/* Close all of the query sockets so that we can open
763		 * the main socket.  SO_REUSEPORT is not a solution,
764		 * since that would let two daemons bind to the broadcast
765		 * socket.
766		 */
767		for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) {
768			if (ifp->int_rip_sock >= 0) {
769				(void)close(ifp->int_rip_sock);
770				ifp->int_rip_sock = -1;
771			}
772		}
773
774		rip_sock = get_rip_sock(INADDR_ANY, 1);
775		rip_sock_mcast = 0;
776
777		/* Do not advertise anything until we have heard something
778		 */
779		if (next_bcast.tv_sec < now.tv_sec+MIN_WAITTIME)
780			next_bcast.tv_sec = now.tv_sec+MIN_WAITTIME;
781
782		for (ifp = ifnet; ifp != 0; ifp = ifp->int_next) {
783			ifp->int_query_time = NEVER;
784			rip_mcast_on(ifp);
785		}
786		ifinit_timer.tv_sec = now.tv_sec;
787
788	} else if (ifp != 0
789		   && !(ifp->int_state & IS_REMOTE)
790		   && ifp->int_rip_sock < 0) {
791		/* RIP is off, so ensure there are sockets on which
792		 * to listen for queries.
793		 */
794		ifp->int_rip_sock = get_rip_sock(ifp->int_addr, 0);
795	}
796
797	fix_select();
798}
799
800
801/* die if malloc(3) fails
802 */
803void *
804rtmalloc(size_t size,
805	 const char *msg)
806{
807	void *p = malloc(size);
808	if (p == 0)
809		logbad(1,"malloc(%lu) failed in %s", (u_long)size, msg);
810	return p;
811}
812
813
814/* get a random instant in an interval
815 */
816void
817intvl_random(struct timeval *tp,	/* put value here */
818	     u_long lo,			/* value is after this second */
819	     u_long hi)			/* and before this */
820{
821	tp->tv_sec = (time_t)(hi == lo
822			      ? lo
823			      : (lo + random() % ((hi - lo))));
824	tp->tv_usec = random() % 1000000;
825}
826
827
828void
829timevaladd(struct timeval *t1,
830	   struct timeval *t2)
831{
832
833	t1->tv_sec += t2->tv_sec;
834	if ((t1->tv_usec += t2->tv_usec) >= 1000000) {
835		t1->tv_sec++;
836		t1->tv_usec -= 1000000;
837	}
838}
839
840
841/* t1 = t2 - t3
842 */
843static void
844timevalsub(struct timeval *t1,
845	   struct timeval *t2,
846	   struct timeval *t3)
847{
848	t1->tv_sec = t2->tv_sec - t3->tv_sec;
849	if ((t1->tv_usec = t2->tv_usec - t3->tv_usec) < 0) {
850		t1->tv_sec--;
851		t1->tv_usec += 1000000;
852	}
853}
854
855
856/* put a message into the system log
857 */
858void
859msglog(const char *p, ...)
860{
861	va_list args;
862
863	trace_flush();
864
865	va_start(args, p);
866	vsyslog(LOG_ERR, p, args);
867
868	if (ftrace != 0) {
869		if (ftrace == stdout)
870			(void)fputs("routed: ", ftrace);
871		(void)vfprintf(ftrace, p, args);
872		(void)fputc('\n', ftrace);
873	}
874	va_end(args);
875}
876
877
878/* Put a message about a bad system into the system log if
879 * we have not complained about it recently.
880 *
881 * It is desirable to complain about all bad systems, but not too often.
882 * In the worst case, it is not practical to keep track of all bad systems.
883 * For example, there can be many systems with the wrong password.
884 */
885void
886msglim(struct msg_limit *lim, naddr addr, const char *p, ...)
887{
888	va_list args;
889	int i;
890	struct msg_sub *ms1, *ms;
891	const char *p1;
892
893	va_start(args, p);
894
895	/* look for the oldest slot in the table
896	 * or the slot for the bad router.
897	 */
898	ms = ms1 = lim->subs;
899	for (i = MSG_SUBJECT_N; ; i--, ms1++) {
900		if (i == 0) {
901			/* Reuse a slot at most once every 10 minutes.
902			 */
903			if (lim->reuse > now.tv_sec) {
904				ms = 0;
905			} else {
906				ms = ms1;
907				lim->reuse = now.tv_sec + 10*60;
908			}
909			break;
910		}
911		if (ms->addr == addr) {
912			/* Repeat a complaint about a given system at
913			 * most once an hour.
914			 */
915			if (ms->until > now.tv_sec)
916				ms = 0;
917			break;
918		}
919		if (ms->until < ms1->until)
920			ms = ms1;
921	}
922	if (ms != 0) {
923		ms->addr = addr;
924		ms->until = now.tv_sec + 60*60;	/* 60 minutes */
925
926		trace_flush();
927		for (p1 = p; *p1 == ' '; p1++)
928			continue;
929		vsyslog(LOG_ERR, p1, args);
930	}
931
932	/* always display the message if tracing */
933	if (ftrace != 0) {
934		(void)vfprintf(ftrace, p, args);
935		(void)fputc('\n', ftrace);
936	}
937	va_end(args);
938}
939
940
941void
942logbad(int dump, const char *p, ...)
943{
944	va_list args;
945
946	trace_flush();
947
948	va_start(args, p);
949	vsyslog(LOG_ERR, p, args);
950
951	(void)fputs("routed: ", stderr);
952	(void)vfprintf(stderr, p, args);
953	(void)fputs("; giving up\n",stderr);
954	(void)fflush(stderr);
955	va_end(args);
956
957	if (dump)
958		abort();
959	exit(1);
960}
961