main.c revision 11820 
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 1995/10/11 18:57:21 jhay 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[MAXPACKETSIZE+sizeof(struct ipxdp)+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 ipxdp)];
90struct	sap_packet *sap_msg =
91		(struct sap_packet *) &packet[sizeof (struct ipxdp)];
92void	hup(), fkexit(), timer();
93void	process(int fd, int pkt_type);
94int	getsocket(int type, int proto, struct sockaddr_ipx *sipx);
95
96int
97main(argc, argv)
98	int argc;
99	char *argv[];
100{
101	int nfds;
102	fd_set fdvar;
103
104	argv0 = argv;
105	argv++, argc--;
106	while (argc > 0 && **argv == '-') {
107		if (strcmp(*argv, "-s") == 0) {
108			supplier = 1;
109			argv++, argc--;
110			continue;
111		}
112		if (strcmp(*argv, "-q") == 0) {
113			supplier = 0;
114			argv++, argc--;
115			continue;
116		}
117		if (strcmp(*argv, "-R") == 0) {
118			noteremoterequests++;
119			argv++, argc--;
120			continue;
121		}
122		if (strcmp(*argv, "-S") == 0) {
123			dosap = 0;
124			argv++, argc--;
125			continue;
126		}
127		if (strcmp(*argv, "-t") == 0) {
128			tracepackets++;
129			argv++, argc--;
130			ftrace = stderr;
131			tracing = 1;
132			continue;
133		}
134		if (strcmp(*argv, "-g") == 0) {
135			gateway = 1;
136			argv++, argc--;
137			continue;
138		}
139		if (strcmp(*argv, "-l") == 0) {
140			gateway = -1;
141			argv++, argc--;
142			continue;
143		}
144		fprintf(stderr,
145			"usage: ipxrouted [ -s ] [ -q ] [ -t ] [ -g ] [ -l ]\n");
146		exit(1);
147	}
148
149
150#ifndef DEBUG
151	if (!tracepackets)
152		daemon(0, 0);
153#endif
154	openlog("IPXrouted", LOG_PID, LOG_DAEMON);
155
156	addr.sipx_family = AF_IPX;
157	addr.sipx_len = sizeof(addr);
158	addr.sipx_port = htons(IPXPORT_RIP);
159	ipx_anynet.s_net[0] = ipx_anynet.s_net[1] = -1;
160	ipx_netmask.sipx_addr.x_net = ipx_anynet;
161	ipx_netmask.sipx_len = 6;
162	ipx_netmask.sipx_family = AF_IPX;
163	r = socket(AF_ROUTE, SOCK_RAW, 0);
164	/* later, get smart about lookingforinterfaces */
165	if (r)
166		shutdown(r, 0); /* for now, don't want reponses */
167	else {
168		fprintf(stderr, "IPXrouted: no routing socket\n");
169		exit(1);
170	}
171	ripsock = getsocket(SOCK_DGRAM, 0, &addr);
172	if (ripsock < 0)
173		exit(1);
174
175	if (dosap) {
176		addr.sipx_port = htons(IPXPORT_SAP);
177		sapsock = getsocket(SOCK_DGRAM, 0, &addr);
178		if (sapsock < 0)
179			exit(1);
180	} else
181		sapsock = -1;
182
183	/*
184	 * Any extra argument is considered
185	 * a tracing log file.
186	 */
187	if (argc > 0)
188		traceon(*argv);
189	/*
190	 * Collect an initial view of the world by
191	 * snooping in the kernel.  Then, send a request packet on all
192	 * directly connected networks to find out what
193	 * everyone else thinks.
194	 */
195	rtinit();
196	sapinit();
197	ifinit();
198	if (supplier < 0)
199		supplier = 0;
200	/* request the state of the world */
201	msg->rip_cmd = htons(RIPCMD_REQUEST);
202	msg->rip_nets[0].rip_dst = ipx_anynet;
203	msg->rip_nets[0].rip_metric =  htons(HOPCNT_INFINITY);
204	msg->rip_nets[0].rip_ticks =  htons(-1);
205	toall(sndmsg, NULL);
206
207	if (dosap) {
208		sap_msg->sap_cmd = htons(SAP_REQ);
209		sap_msg->sap[0].ServType = htons(SAP_WILDCARD);
210		toall(sapsndmsg, NULL);
211	}
212
213	signal(SIGALRM, timer);
214	signal(SIGHUP, hup);
215	signal(SIGINT, hup);
216	signal(SIGEMT, fkexit);
217	timer();
218
219	nfds = 1 + max(sapsock, ripsock);
220
221	for (;;) {
222		FD_ZERO(&fdvar);
223		if (dosap) {
224			FD_SET(sapsock, &fdvar);
225		}
226		FD_SET(ripsock, &fdvar);
227
228		if(select(nfds, &fdvar, (fd_set *)NULL, (fd_set *)NULL,
229		   (struct timeval *)NULL) < 0) {
230			if(errno != EINTR) {
231				perror("during select");
232				exit(1);
233			}
234		}
235
236		if(FD_ISSET(ripsock, &fdvar))
237			process(ripsock, RIP_PKT);
238
239		if(dosap && FD_ISSET(sapsock, &fdvar))
240			process(sapsock, SAP_PKT);
241	}
242}
243
244void
245process(fd, pkt_type)
246	int fd;
247	int pkt_type;
248{
249	struct sockaddr from;
250	int fromlen = sizeof (from), cc, omask;
251	struct ipxdp *ipxdp = (struct ipxdp *)packet;
252
253	cc = recvfrom(fd, packet, sizeof (packet), 0, &from, &fromlen);
254	if (cc <= 0) {
255		if (cc < 0 && errno != EINTR)
256			syslog(LOG_ERR, "recvfrom: %m");
257		return;
258	}
259	if (tracepackets > 1 && ftrace) {
260	    fprintf(ftrace,"rcv %d bytes on %s ",
261		    cc, ipxdp_ntoa(&ipxdp->ipxdp_dna));
262	    fprintf(ftrace," from %s\n", ipxdp_ntoa(&ipxdp->ipxdp_sna));
263	}
264
265	if (noteremoterequests &&
266	    !ipx_neteqnn(ipxdp->ipxdp_sna.x_net, ipx_zeronet) &&
267	    !ipx_neteq(ipxdp->ipxdp_sna, ipxdp->ipxdp_dna))
268	{
269		syslog(LOG_ERR,
270		       "net of interface (%s) != net on ether (%s)!\n",
271		       ipxdp_nettoa(ipxdp->ipxdp_dna.x_net),
272		       ipxdp_nettoa(ipxdp->ipxdp_sna.x_net));
273	}
274
275	/* We get the IPX header in front of the RIF packet*/
276	cc -= sizeof (struct ipxdp);
277#define	mask(s)	(1<<((s)-1))
278	omask = sigblock(mask(SIGALRM));
279	switch(pkt_type) {
280		case SAP_PKT: sap_input(&from, cc);
281				break;
282		case RIP_PKT: rip_input(&from, cc);
283				break;
284	}
285	sigsetmask(omask);
286}
287
288int
289getsocket(type, proto, sipx)
290	int type, proto;
291	struct sockaddr_ipx *sipx;
292{
293	int domain = sipx->sipx_family;
294	int retry, s, on = 1;
295
296	retry = 1;
297	while ((s = socket(domain, type, proto)) < 0 && retry) {
298		syslog(LOG_ERR, "socket: %m");
299		sleep(5 * retry);
300		retry <<= 1;
301	}
302	if (retry == 0)
303		return (-1);
304	while (bind(s, (struct sockaddr *)sipx, sizeof (*sipx)) < 0 && retry) {
305		syslog(LOG_ERR, "bind: %m");
306		sleep(5 * retry);
307		retry <<= 1;
308	}
309	if (retry == 0)
310		return (-1);
311	if (domain==AF_IPX) {
312		struct ipxdp ipxdp;
313		if (setsockopt(s, 0, SO_HEADERS_ON_INPUT, &on, sizeof(on))) {
314			syslog(LOG_ERR, "setsockopt SEE HEADERS: %m");
315			exit(1);
316		}
317		if (ntohs(sipx->sipx_addr.x_port) == IPXPORT_RIP)
318			ipxdp.ipxdp_pt = IPXPROTO_RI;
319		else if (ntohs(sipx->sipx_addr.x_port) == IPXPORT_SAP)
320			ipxdp.ipxdp_pt = IPXPROTO_SAP;
321		else {
322			syslog(LOG_ERR, "port should be either RIP or SAP");
323			exit(1);
324		}
325		if (setsockopt(s, 0, SO_DEFAULT_HEADERS, &ipxdp, sizeof(ipxdp))) {
326			syslog(LOG_ERR, "setsockopt SET HEADER: %m");
327			exit(1);
328		}
329	}
330	if (setsockopt(s, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) {
331		syslog(LOG_ERR, "setsockopt SO_BROADCAST: %m");
332		exit(1);
333	}
334	return (s);
335}
336
337/*
338 * Fork and exit on EMT-- for profiling.
339 */
340void
341fkexit()
342{
343	if (fork() == 0)
344		exit(0);
345}
346