main.c revision 27244 
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 *	$Id: main.c,v 1.6 1997/02/22 16:00:57 peter Exp $
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		fprintf(stderr,
151			"usage: ipxrouted [ -s ] [ -q ] [ -t ] [ -g ] [ -l ]\n");
152		exit(1);
153	}
154
155
156#ifndef DEBUG
157	if (!tracepackets)
158		daemon(0, 0);
159#endif
160	openlog("IPXrouted", LOG_PID, LOG_DAEMON);
161
162	addr.sipx_family = AF_IPX;
163	addr.sipx_len = sizeof(addr);
164	addr.sipx_port = htons(IPXPORT_RIP);
165	ipx_anynet.s_net[0] = ipx_anynet.s_net[1] = -1;
166	ipx_netmask.sipx_addr.x_net = ipx_anynet;
167	ipx_netmask.sipx_len = 6;
168	ipx_netmask.sipx_family = AF_IPX;
169	r = socket(AF_ROUTE, SOCK_RAW, 0);
170	/* later, get smart about lookingforinterfaces */
171	if (r)
172		shutdown(r, 0); /* for now, don't want reponses */
173	else {
174		fprintf(stderr, "IPXrouted: no routing socket\n");
175		exit(1);
176	}
177	ripsock = getsocket(SOCK_DGRAM, 0, &addr);
178	if (ripsock < 0)
179		exit(1);
180
181	if (dosap) {
182		addr.sipx_port = htons(IPXPORT_SAP);
183		sapsock = getsocket(SOCK_DGRAM, 0, &addr);
184		if (sapsock < 0)
185			exit(1);
186	} else
187		sapsock = -1;
188
189	/*
190	 * Any extra argument is considered
191	 * a tracing log file.
192	 */
193	if (argc > 0)
194		traceon(*argv);
195	/*
196	 * Collect an initial view of the world by
197	 * snooping in the kernel.  Then, send a request packet on all
198	 * directly connected networks to find out what
199	 * everyone else thinks.
200	 */
201	rtinit();
202	sapinit();
203	ifinit();
204	if (supplier < 0)
205		supplier = 0;
206	/* request the state of the world */
207	msg->rip_cmd = htons(RIPCMD_REQUEST);
208	msg->rip_nets[0].rip_dst = ipx_anynet;
209	msg->rip_nets[0].rip_metric =  htons(HOPCNT_INFINITY);
210	msg->rip_nets[0].rip_ticks =  htons(-1);
211	toall(sndmsg, NULL, 0);
212
213	if (dosap) {
214		sap_msg->sap_cmd = htons(SAP_REQ);
215		sap_msg->sap[0].ServType = htons(SAP_WILDCARD);
216		toall(sapsndmsg, NULL, 0);
217	}
218
219	signal(SIGALRM, catchtimer);
220	signal(SIGHUP, hup);
221	signal(SIGINT, hup);
222	signal(SIGEMT, fkexit);
223	signal(SIGINFO, getinfo);
224
225	tval.it_interval.tv_sec = TIMER_RATE;
226	tval.it_interval.tv_usec = 0;
227	tval.it_value.tv_sec = TIMER_RATE;
228	tval.it_value.tv_usec = 0;
229	setitimer(ITIMER_REAL, &tval, NULL);
230
231	nfds = 1 + max(sapsock, ripsock);
232
233	for (;;) {
234		if (dobcast) {
235			dobcast = 0;
236			lastbcast = time(NULL);
237			timer();
238		}
239
240		FD_ZERO(&fdvar);
241		if (dosap) {
242			FD_SET(sapsock, &fdvar);
243		}
244		FD_SET(ripsock, &fdvar);
245
246		if(select(nfds, &fdvar, (fd_set *)NULL, (fd_set *)NULL,
247		   (struct timeval *)NULL) < 0) {
248			if(errno == EINTR)
249				continue;
250			perror("during select");
251			exit(1);
252		}
253
254		if(FD_ISSET(ripsock, &fdvar))
255			process(ripsock, RIP_PKT);
256
257		if(dosap && FD_ISSET(sapsock, &fdvar))
258			process(sapsock, SAP_PKT);
259
260		ttime = time(NULL);
261		if (ttime > (lastbcast + TIMER_RATE + (TIMER_RATE * 2 / 3))) {
262			dobcast = 1;
263			syslog(LOG_ERR, "Missed alarm");
264		}
265	}
266}
267
268void
269process(fd, pkt_type)
270	int fd;
271	int pkt_type;
272{
273	struct sockaddr from;
274	int fromlen = sizeof (from), cc, omask;
275	struct ipx *ipxdp = (struct ipx *)packet;
276
277	cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen);
278	if (cc <= 0) {
279		if (cc < 0 && errno != EINTR)
280			syslog(LOG_ERR, "recvfrom: %m");
281		return;
282	}
283	if (tracepackets > 1 && ftrace) {
284	    fprintf(ftrace,"rcv %d bytes on %s ",
285		    cc, ipxdp_ntoa(&ipxdp->ipx_dna));
286	    fprintf(ftrace," from %s\n", ipxdp_ntoa(&ipxdp->ipx_sna));
287	}
288
289	if (noteremoterequests &&
290	    !ipx_neteqnn(ipxdp->ipx_sna.x_net, ipx_zeronet) &&
291	    !ipx_neteq(ipxdp->ipx_sna, ipxdp->ipx_dna))
292	{
293		syslog(LOG_ERR,
294		       "net of interface (%s) != net on ether (%s)!\n",
295		       ipxdp_nettoa(ipxdp->ipx_dna.x_net),
296		       ipxdp_nettoa(ipxdp->ipx_sna.x_net));
297	}
298
299	/* We get the IPX header in front of the RIF packet*/
300	cc -= sizeof (struct ipx);
301#define	mask(s)	(1<<((s)-1))
302	omask = sigblock(mask(SIGALRM));
303	switch(pkt_type) {
304		case SAP_PKT: sap_input(&from, cc);
305				break;
306		case RIP_PKT: rip_input(&from, cc);
307				break;
308	}
309	sigsetmask(omask);
310}
311
312int
313getsocket(type, proto, sipx)
314	int type, proto;
315	struct sockaddr_ipx *sipx;
316{
317	int domain = sipx->sipx_family;
318	int retry, s, on = 1;
319
320	retry = 1;
321	while ((s = socket(domain, type, proto)) < 0 && retry) {
322		syslog(LOG_ERR, "socket: %m");
323		sleep(5 * retry);
324		retry <<= 1;
325	}
326	if (retry == 0)
327		return (-1);
328	while (bind(s, (struct sockaddr *)sipx, sizeof (*sipx)) < 0 && retry) {
329		syslog(LOG_ERR, "bind: %m");
330		sleep(5 * retry);
331		retry <<= 1;
332	}
333	if (retry == 0)
334		return (-1);
335	if (domain==AF_IPX) {
336		struct ipx ipxdp;
337		if (setsockopt(s, 0, SO_HEADERS_ON_INPUT, &on, sizeof(on))) {
338			syslog(LOG_ERR, "setsockopt SEE HEADERS: %m");
339			exit(1);
340		}
341		if (ntohs(sipx->sipx_addr.x_port) == IPXPORT_RIP)
342			ipxdp.ipx_pt = IPXPROTO_RI;
343		else if (ntohs(sipx->sipx_addr.x_port) == IPXPORT_SAP)
344#ifdef IPXPROTO_SAP
345			ipxdp.ipx_pt = IPXPROTO_SAP;
346#else
347			ipxdp.ipx_pt = IPXPROTO_PXP;
348#endif
349		else {
350			syslog(LOG_ERR, "port should be either RIP or SAP");
351			exit(1);
352		}
353		if (setsockopt(s, 0, SO_DEFAULT_HEADERS, &ipxdp, sizeof(ipxdp))) {
354			syslog(LOG_ERR, "setsockopt SET HEADER: %m");
355			exit(1);
356		}
357	}
358	if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
359		syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
360		exit(1);
361	}
362	return (s);
363}
364
365/*
366 * Fork and exit on EMT-- for profiling.
367 */
368void
369fkexit()
370{
371	if (fork() == 0)
372		exit(0);
373}
374
375void
376catchtimer()
377{
378	dobcast = 1;
379}
380
381void
382getinfo()
383{
384	FILE *fh;
385
386	fh = fopen("/tmp/ipxrouted.dmp", "a");
387	if(fh == NULL)
388		return;
389
390	dumpriptable(fh);
391	dumpsaptable(fh, sap_head);
392
393	fclose(fh);
394}
395
396