main.c revision 50479 
1/*
2 * Copyright (c) 1985, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Copyright (c) 1995 John Hay.  All rights reserved.
6 *
7 * This file includes significant work done at Cornell University by
8 * Bill Nesheim.  That work included by permission.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. All advertising materials mentioning features or use of this software
19 *    must display the following acknowledgement:
20 *	This product includes software developed by the University of
21 *	California, Berkeley and its contributors.
22 * 4. Neither the name of the University nor the names of its contributors
23 *    may be used to endorse or promote products derived from this software
24 *    without specific prior written permission.
25 *
26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
36 * SUCH DAMAGE.
37 *
38 * $FreeBSD: head/usr.sbin/IPXrouted/main.c 50479 1999-08-28 01:35:59Z peter $
39 */
40
41#ifndef lint
42static char copyright[] =
43"@(#) Copyright (c) 1985, 1993\n\
44	The Regents of the University of California.  All rights reserved.\n";
45#endif /* not lint */
46
47#ifndef lint
48static char sccsid[] = "@(#)main.c	8.1 (Berkeley) 6/5/93";
49#endif /* not lint */
50
51/*
52 * IPX Routing Information Protocol Daemon
53 */
54#include "defs.h"
55#include <sys/time.h>
56
57#include <net/if.h>
58
59#include <errno.h>
60#include <nlist.h>
61#include <signal.h>
62#include <paths.h>
63#include <stdlib.h>
64#include <unistd.h>
65
66#define SAP_PKT		0
67#define RIP_PKT		1
68
69struct	sockaddr_ipx addr;	/* Daemon's Address */
70int	ripsock;		/* RIP Socket to listen on */
71int	sapsock;		/* SAP Socket to listen on */
72int	kmem;
73int	install;		/* if 1 call kernel */
74int	lookforinterfaces;	/* if 1 probe kernel for new up interfaces */
75int	performnlist;		/* if 1 check if /kernel has changed */
76int	externalinterfaces;	/* # of remote and local interfaces */
77int	timeval;		/* local idea of time */
78int	noteremoterequests;	/* squawk on requests from non-local nets */
79int	r;			/* Routing socket to install updates with */
80struct	sockaddr_ipx ipx_netmask;	/* Used in installing routes */
81
82char	packet[MAXRXPACKETSIZE+1];
83
84char	**argv0;
85
86int	supplier = -1;		/* process should supply updates */
87int	dosap = 1;		/* By default do SAP services. */
88int	dobcast = 1;		/* A RIP/SAP broadcast is needed. */
89time_t	lastbcast;		/* Time of last RIP/SAP broadcast */
90
91struct	rip *msg = (struct rip *) &packet[sizeof (struct ipx)];
92struct	sap_packet *sap_msg =
93		(struct sap_packet *) &packet[sizeof (struct ipx)];
94void	hup(), fkexit(), timer();
95void	process(int fd, int pkt_type);
96int	getsocket(int type, int proto, struct sockaddr_ipx *sipx);
97void	getinfo();
98void	catchtimer();
99
100int
101main(argc, argv)
102	int argc;
103	char *argv[];
104{
105	int nfds;
106	fd_set fdvar;
107	time_t ttime;
108	struct itimerval tval;
109
110	argv0 = argv;
111	argv++, argc--;
112	while (argc > 0 && **argv == '-') {
113		if (strcmp(*argv, "-s") == 0) {
114			supplier = 1;
115			argv++, argc--;
116			continue;
117		}
118		if (strcmp(*argv, "-q") == 0) {
119			supplier = 0;
120			argv++, argc--;
121			continue;
122		}
123		if (strcmp(*argv, "-R") == 0) {
124			noteremoterequests++;
125			argv++, argc--;
126			continue;
127		}
128		if (strcmp(*argv, "-S") == 0) {
129			dosap = 0;
130			argv++, argc--;
131			continue;
132		}
133		if (strcmp(*argv, "-t") == 0) {
134			tracepackets++;
135			argv++, argc--;
136			ftrace = stderr;
137			tracing = 1;
138			continue;
139		}
140		if (strcmp(*argv, "-g") == 0) {
141			gateway = 1;
142			argv++, argc--;
143			continue;
144		}
145		if (strcmp(*argv, "-l") == 0) {
146			gateway = -1;
147			argv++, argc--;
148			continue;
149		}
150		if (strcmp(*argv, "-N") == 0) {
151			dognreply = 0;
152			argv++, argc--;
153			continue;
154		}
155		fprintf(stderr,
156			"usage: ipxrouted [ -s ] [ -q ] [ -t ] [ -g ] [ -l ] [ -N ]\n");
157		exit(1);
158	}
159
160
161#ifndef DEBUG
162	if (!tracepackets)
163		daemon(0, 0);
164#endif
165	openlog("IPXrouted", LOG_PID, LOG_DAEMON);
166
167	addr.sipx_family = AF_IPX;
168	addr.sipx_len = sizeof(addr);
169	addr.sipx_port = htons(IPXPORT_RIP);
170	ipx_anynet.s_net[0] = ipx_anynet.s_net[1] = -1;
171	ipx_netmask.sipx_addr.x_net = ipx_anynet;
172	ipx_netmask.sipx_len = 6;
173	ipx_netmask.sipx_family = AF_IPX;
174	r = socket(AF_ROUTE, SOCK_RAW, 0);
175	/* later, get smart about lookingforinterfaces */
176	if (r)
177		shutdown(r, 0); /* for now, don't want reponses */
178	else {
179		fprintf(stderr, "IPXrouted: no routing socket\n");
180		exit(1);
181	}
182	ripsock = getsocket(SOCK_DGRAM, 0, &addr);
183	if (ripsock < 0)
184		exit(1);
185
186	if (dosap) {
187		addr.sipx_port = htons(IPXPORT_SAP);
188		sapsock = getsocket(SOCK_DGRAM, 0, &addr);
189		if (sapsock < 0)
190			exit(1);
191	} else
192		sapsock = -1;
193
194	/*
195	 * Any extra argument is considered
196	 * a tracing log file.
197	 */
198	if (argc > 0)
199		traceon(*argv);
200	/*
201	 * Collect an initial view of the world by
202	 * snooping in the kernel.  Then, send a request packet on all
203	 * directly connected networks to find out what
204	 * everyone else thinks.
205	 */
206	rtinit();
207	sapinit();
208	ifinit();
209	if (supplier < 0)
210		supplier = 0;
211	/* request the state of the world */
212	msg->rip_cmd = htons(RIPCMD_REQUEST);
213	msg->rip_nets[0].rip_dst = ipx_anynet;
214	msg->rip_nets[0].rip_metric =  htons(HOPCNT_INFINITY);
215	msg->rip_nets[0].rip_ticks =  htons(-1);
216	toall(sndmsg, NULL, 0);
217
218	if (dosap) {
219		sap_msg->sap_cmd = htons(SAP_REQ);
220		sap_msg->sap[0].ServType = htons(SAP_WILDCARD);
221		toall(sapsndmsg, NULL, 0);
222	}
223
224	signal(SIGALRM, catchtimer);
225	signal(SIGHUP, hup);
226	signal(SIGINT, hup);
227	signal(SIGEMT, fkexit);
228	signal(SIGINFO, getinfo);
229
230	tval.it_interval.tv_sec = TIMER_RATE;
231	tval.it_interval.tv_usec = 0;
232	tval.it_value.tv_sec = TIMER_RATE;
233	tval.it_value.tv_usec = 0;
234	setitimer(ITIMER_REAL, &tval, NULL);
235
236	nfds = 1 + max(sapsock, ripsock);
237
238	for (;;) {
239		if (dobcast) {
240			dobcast = 0;
241			lastbcast = time(NULL);
242			timer();
243		}
244
245		FD_ZERO(&fdvar);
246		if (dosap) {
247			FD_SET(sapsock, &fdvar);
248		}
249		FD_SET(ripsock, &fdvar);
250
251		if(select(nfds, &fdvar, (fd_set *)NULL, (fd_set *)NULL,
252		   (struct timeval *)NULL) < 0) {
253			if(errno == EINTR)
254				continue;
255			perror("during select");
256			exit(1);
257		}
258
259		if(FD_ISSET(ripsock, &fdvar))
260			process(ripsock, RIP_PKT);
261
262		if(dosap && FD_ISSET(sapsock, &fdvar))
263			process(sapsock, SAP_PKT);
264
265		ttime = time(NULL);
266		if (ttime > (lastbcast + TIMER_RATE + (TIMER_RATE * 2 / 3))) {
267			dobcast = 1;
268			syslog(LOG_ERR, "Missed alarm");
269		}
270	}
271}
272
273void
274process(fd, pkt_type)
275	int fd;
276	int pkt_type;
277{
278	struct sockaddr from;
279	int fromlen = sizeof (from), cc, omask;
280	struct ipx *ipxdp = (struct ipx *)packet;
281
282	cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen);
283	if (cc <= 0) {
284		if (cc < 0 && errno != EINTR)
285			syslog(LOG_ERR, "recvfrom: %m");
286		return;
287	}
288	if (tracepackets > 1 && ftrace) {
289	    fprintf(ftrace,"rcv %d bytes on %s ",
290		    cc, ipxdp_ntoa(&ipxdp->ipx_dna));
291	    fprintf(ftrace," from %s\n", ipxdp_ntoa(&ipxdp->ipx_sna));
292	}
293
294	if (noteremoterequests &&
295	    !ipx_neteqnn(ipxdp->ipx_sna.x_net, ipx_zeronet) &&
296	    !ipx_neteq(ipxdp->ipx_sna, ipxdp->ipx_dna))
297	{
298		syslog(LOG_ERR,
299		       "net of interface (%s) != net on ether (%s)!\n",
300		       ipxdp_nettoa(ipxdp->ipx_dna.x_net),
301		       ipxdp_nettoa(ipxdp->ipx_sna.x_net));
302	}
303
304	/* We get the IPX header in front of the RIF packet*/
305	cc -= sizeof (struct ipx);
306#define	mask(s)	(1<<((s)-1))
307	omask = sigblock(mask(SIGALRM));
308	switch(pkt_type) {
309		case SAP_PKT: sap_input(&from, cc);
310				break;
311		case RIP_PKT: rip_input(&from, cc);
312				break;
313	}
314	sigsetmask(omask);
315}
316
317int
318getsocket(type, proto, sipx)
319	int type, proto;
320	struct sockaddr_ipx *sipx;
321{
322	int domain = sipx->sipx_family;
323	int retry, s, on = 1;
324
325	retry = 1;
326	while ((s = socket(domain, type, proto)) < 0 && retry) {
327		syslog(LOG_ERR, "socket: %m");
328		sleep(5 * retry);
329		retry <<= 1;
330	}
331	if (retry == 0)
332		return (-1);
333	while (bind(s, (struct sockaddr *)sipx, sizeof (*sipx)) < 0 && retry) {
334		syslog(LOG_ERR, "bind: %m");
335		sleep(5 * retry);
336		retry <<= 1;
337	}
338	if (retry == 0)
339		return (-1);
340	if (domain==AF_IPX) {
341		struct ipx ipxdp;
342		if (setsockopt(s, 0, SO_HEADERS_ON_INPUT, &on, sizeof(on))) {
343			syslog(LOG_ERR, "setsockopt SEE HEADERS: %m");
344			exit(1);
345		}
346		if (ntohs(sipx->sipx_addr.x_port) == IPXPORT_RIP)
347			ipxdp.ipx_pt = IPXPROTO_RI;
348		else if (ntohs(sipx->sipx_addr.x_port) == IPXPORT_SAP)
349#ifdef IPXPROTO_SAP
350			ipxdp.ipx_pt = IPXPROTO_SAP;
351#else
352			ipxdp.ipx_pt = IPXPROTO_PXP;
353#endif
354		else {
355			syslog(LOG_ERR, "port should be either RIP or SAP");
356			exit(1);
357		}
358		if (setsockopt(s, 0, SO_DEFAULT_HEADERS, &ipxdp, sizeof(ipxdp))) {
359			syslog(LOG_ERR, "setsockopt SET HEADER: %m");
360			exit(1);
361		}
362	}
363	if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
364		syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
365		exit(1);
366	}
367	return (s);
368}
369
370/*
371 * Fork and exit on EMT-- for profiling.
372 */
373void
374fkexit()
375{
376	if (fork() == 0)
377		exit(0);
378}
379
380void
381catchtimer()
382{
383	dobcast = 1;
384}
385
386void
387getinfo()
388{
389	FILE *fh;
390
391	fh = fopen("/var/log/ipxrouted.dmp", "a");
392	if(fh == NULL)
393		return;
394
395	dumpriptable(fh);
396	dumpsaptable(fh, sap_head);
397
398	fclose(fh);
399}
400
401