main.c revision 15248 
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 1.3 1995/12/09 09:42:03 julian 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. */
88
89struct	rip *msg = (struct rip *) &packet[sizeof (struct ipx)];
90struct	sap_packet *sap_msg =
91		(struct sap_packet *) &packet[sizeof (struct ipx)];
92void	hup(), fkexit(), timer();
93void	process(int fd, int pkt_type);
94int	getsocket(int type, int proto, struct sockaddr_ipx *sipx);
95void	getinfo();
96
97int
98main(argc, argv)
99	int argc;
100	char *argv[];
101{
102	int nfds;
103	fd_set fdvar;
104
105	argv0 = argv;
106	argv++, argc--;
107	while (argc > 0 && **argv == '-') {
108		if (strcmp(*argv, "-s") == 0) {
109			supplier = 1;
110			argv++, argc--;
111			continue;
112		}
113		if (strcmp(*argv, "-q") == 0) {
114			supplier = 0;
115			argv++, argc--;
116			continue;
117		}
118		if (strcmp(*argv, "-R") == 0) {
119			noteremoterequests++;
120			argv++, argc--;
121			continue;
122		}
123		if (strcmp(*argv, "-S") == 0) {
124			dosap = 0;
125			argv++, argc--;
126			continue;
127		}
128		if (strcmp(*argv, "-t") == 0) {
129			tracepackets++;
130			argv++, argc--;
131			ftrace = stderr;
132			tracing = 1;
133			continue;
134		}
135		if (strcmp(*argv, "-g") == 0) {
136			gateway = 1;
137			argv++, argc--;
138			continue;
139		}
140		if (strcmp(*argv, "-l") == 0) {
141			gateway = -1;
142			argv++, argc--;
143			continue;
144		}
145		fprintf(stderr,
146			"usage: ipxrouted [ -s ] [ -q ] [ -t ] [ -g ] [ -l ]\n");
147		exit(1);
148	}
149
150
151#ifndef DEBUG
152	if (!tracepackets)
153		daemon(0, 0);
154#endif
155	openlog("IPXrouted", LOG_PID, LOG_DAEMON);
156
157	addr.sipx_family = AF_IPX;
158	addr.sipx_len = sizeof(addr);
159	addr.sipx_port = htons(IPXPORT_RIP);
160	ipx_anynet.s_net[0] = ipx_anynet.s_net[1] = -1;
161	ipx_netmask.sipx_addr.x_net = ipx_anynet;
162	ipx_netmask.sipx_len = 6;
163	ipx_netmask.sipx_family = AF_IPX;
164	r = socket(AF_ROUTE, SOCK_RAW, 0);
165	/* later, get smart about lookingforinterfaces */
166	if (r)
167		shutdown(r, 0); /* for now, don't want reponses */
168	else {
169		fprintf(stderr, "IPXrouted: no routing socket\n");
170		exit(1);
171	}
172	ripsock = getsocket(SOCK_DGRAM, 0, &addr);
173	if (ripsock < 0)
174		exit(1);
175
176	if (dosap) {
177		addr.sipx_port = htons(IPXPORT_SAP);
178		sapsock = getsocket(SOCK_DGRAM, 0, &addr);
179		if (sapsock < 0)
180			exit(1);
181	} else
182		sapsock = -1;
183
184	/*
185	 * Any extra argument is considered
186	 * a tracing log file.
187	 */
188	if (argc > 0)
189		traceon(*argv);
190	/*
191	 * Collect an initial view of the world by
192	 * snooping in the kernel.  Then, send a request packet on all
193	 * directly connected networks to find out what
194	 * everyone else thinks.
195	 */
196	rtinit();
197	sapinit();
198	ifinit();
199	if (supplier < 0)
200		supplier = 0;
201	/* request the state of the world */
202	msg->rip_cmd = htons(RIPCMD_REQUEST);
203	msg->rip_nets[0].rip_dst = ipx_anynet;
204	msg->rip_nets[0].rip_metric =  htons(HOPCNT_INFINITY);
205	msg->rip_nets[0].rip_ticks =  htons(-1);
206	toall(sndmsg, NULL);
207
208	if (dosap) {
209		sap_msg->sap_cmd = htons(SAP_REQ);
210		sap_msg->sap[0].ServType = htons(SAP_WILDCARD);
211		toall(sapsndmsg, NULL);
212	}
213
214	signal(SIGALRM, timer);
215	signal(SIGHUP, hup);
216	signal(SIGINT, hup);
217	signal(SIGEMT, fkexit);
218	signal(SIGINFO, getinfo);
219	timer();
220
221	nfds = 1 + max(sapsock, ripsock);
222
223	for (;;) {
224		FD_ZERO(&fdvar);
225		if (dosap) {
226			FD_SET(sapsock, &fdvar);
227		}
228		FD_SET(ripsock, &fdvar);
229
230		if(select(nfds, &fdvar, (fd_set *)NULL, (fd_set *)NULL,
231		   (struct timeval *)NULL) < 0) {
232			if(errno == EINTR)
233				continue;
234			perror("during select");
235			exit(1);
236		}
237
238		if(FD_ISSET(ripsock, &fdvar))
239			process(ripsock, RIP_PKT);
240
241		if(dosap && FD_ISSET(sapsock, &fdvar))
242			process(sapsock, SAP_PKT);
243	}
244}
245
246void
247process(fd, pkt_type)
248	int fd;
249	int pkt_type;
250{
251	struct sockaddr from;
252	int fromlen = sizeof (from), cc, omask;
253	struct ipx *ipxdp = (struct ipx *)packet;
254
255	cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen);
256	if (cc <= 0) {
257		if (cc < 0 && errno != EINTR)
258			syslog(LOG_ERR, "recvfrom: %m");
259		return;
260	}
261	if (tracepackets > 1 && ftrace) {
262	    fprintf(ftrace,"rcv %d bytes on %s ",
263		    cc, ipxdp_ntoa(&ipxdp->ipx_dna));
264	    fprintf(ftrace," from %s\n", ipxdp_ntoa(&ipxdp->ipx_sna));
265	}
266
267	if (noteremoterequests &&
268	    !ipx_neteqnn(ipxdp->ipx_sna.x_net, ipx_zeronet) &&
269	    !ipx_neteq(ipxdp->ipx_sna, ipxdp->ipx_dna))
270	{
271		syslog(LOG_ERR,
272		       "net of interface (%s) != net on ether (%s)!\n",
273		       ipxdp_nettoa(ipxdp->ipx_dna.x_net),
274		       ipxdp_nettoa(ipxdp->ipx_sna.x_net));
275	}
276
277	/* We get the IPX header in front of the RIF packet*/
278	cc -= sizeof (struct ipx);
279#define	mask(s)	(1<<((s)-1))
280	omask = sigblock(mask(SIGALRM));
281	switch(pkt_type) {
282		case SAP_PKT: sap_input(&from, cc);
283				break;
284		case RIP_PKT: rip_input(&from, cc);
285				break;
286	}
287	sigsetmask(omask);
288}
289
290int
291getsocket(type, proto, sipx)
292	int type, proto;
293	struct sockaddr_ipx *sipx;
294{
295	int domain = sipx->sipx_family;
296	int retry, s, on = 1;
297
298	retry = 1;
299	while ((s = socket(domain, type, proto)) < 0 && retry) {
300		syslog(LOG_ERR, "socket: %m");
301		sleep(5 * retry);
302		retry <<= 1;
303	}
304	if (retry == 0)
305		return (-1);
306	while (bind(s, (struct sockaddr *)sipx, sizeof (*sipx)) < 0 && retry) {
307		syslog(LOG_ERR, "bind: %m");
308		sleep(5 * retry);
309		retry <<= 1;
310	}
311	if (retry == 0)
312		return (-1);
313	if (domain==AF_IPX) {
314		struct ipx ipxdp;
315		if (setsockopt(s, 0, SO_HEADERS_ON_INPUT, &on, sizeof(on))) {
316			syslog(LOG_ERR, "setsockopt SEE HEADERS: %m");
317			exit(1);
318		}
319		if (ntohs(sipx->sipx_addr.x_port) == IPXPORT_RIP)
320			ipxdp.ipx_pt = IPXPROTO_RI;
321		else if (ntohs(sipx->sipx_addr.x_port) == IPXPORT_SAP)
322			ipxdp.ipx_pt = IPXPROTO_SAP;
323		else {
324			syslog(LOG_ERR, "port should be either RIP or SAP");
325			exit(1);
326		}
327		if (setsockopt(s, 0, SO_DEFAULT_HEADERS, &ipxdp, sizeof(ipxdp))) {
328			syslog(LOG_ERR, "setsockopt SET HEADER: %m");
329			exit(1);
330		}
331	}
332	if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
333		syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
334		exit(1);
335	}
336	return (s);
337}
338
339/*
340 * Fork and exit on EMT-- for profiling.
341 */
342void
343fkexit()
344{
345	if (fork() == 0)
346		exit(0);
347}
348
349void
350getinfo()
351{
352	FILE *fh;
353
354	fh = fopen("/tmp/ipxrouted.dmp", "a");
355	if(fh == NULL)
356		return;
357
358	dumpriptable(fh);
359	dumpsaptable(fh, sap_head);
360
361	fclose(fh);
362}
363
364