yp_main.c revision 20053 
1/*
2 * Copyright (c) 1995
3 *	Bill Paul <wpaul@ctr.columbia.edu>.  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 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by Bill Paul.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 *
32 *	$Id: yp_main.c,v 1.6 1996/05/31 16:01:50 wpaul Exp $
33 */
34
35/*
36 * ypserv startup function.
37 * We need out own main() since we have to do some additional work
38 * that rpcgen won't do for us. Most of this file was generated using
39 * rpcgen.new, and later modified.
40 */
41
42#include "yp.h"
43#include <stdio.h>
44#include <stdlib.h> /* getenv, exit */
45#include <rpc/pmap_clnt.h> /* for pmap_unset */
46#include <string.h> /* strcmp */
47#include <signal.h>
48#include <sys/ttycom.h> /* TIOCNOTTY */
49#ifdef __cplusplus
50#include <sysent.h> /* getdtablesize, open */
51#endif /* __cplusplus */
52#include <memory.h>
53#include <sys/socket.h>
54#include <netinet/in.h>
55#include <syslog.h>
56#include <sys/wait.h>
57#include "yp_extern.h"
58#include <unistd.h>
59#include <rpc/rpc.h>
60#include <errno.h>
61#include <err.h>
62
63#ifndef SIG_PF
64#define	SIG_PF void(*)(int)
65#endif
66
67#define	_RPCSVC_CLOSEDOWN 120
68#ifndef lint
69static const char rcsid[] = "$Id: yp_main.c,v 1.6 1996/05/31 16:01:50 wpaul Exp $";
70#endif /* not lint */
71int _rpcpmstart;		/* Started by a port monitor ? */
72static int _rpcfdtype;
73		 /* Whether Stream or Datagram ? */
74	/* States a server can be in wrt request */
75
76#define	_IDLE 0
77#define	_SERVED 1
78#define	_SERVING 2
79
80extern void ypprog_1 __P((struct svc_req, register SVCXPRT));
81extern void ypprog_2 __P((struct svc_req, register SVCXPRT));
82extern int _rpcsvcstate;	 /* Set when a request is serviced */
83char *progname = "ypserv";
84char *yp_dir = _PATH_YP;
85int debug = 0;
86int do_dns = 0;
87
88static
89void _msgout(char* msg)
90{
91	if (debug) {
92		if (_rpcpmstart)
93			syslog(LOG_ERR, msg);
94		else
95			(void) fprintf(stderr, "%s\n", msg);
96	} else
97		syslog(LOG_ERR, msg);
98}
99
100static void unregister()
101{
102	(void) pmap_unset(YPPROG, YPVERS);
103	(void) pmap_unset(YPPROG, YPOLDVERS);
104}
105
106static void reaper(sig)
107	int sig;
108{
109	int status;
110
111	if (sig == SIGHUP) {
112		load_securenets();
113#ifdef DB_CACHE
114		yp_flush_all();
115#endif
116		return;
117	}
118
119	if (sig == SIGCHLD) {
120		while (wait3(&status, WNOHANG, NULL) > 0)
121			children--;
122	} else {
123		unregister();
124		exit(0);
125	}
126}
127
128static void usage()
129{
130	fprintf(stderr, "Usage: %s [-h] [-d] [-n] [-p path]\n", progname);
131	exit(1);
132}
133
134static void
135closedown(int sig)
136{
137	if (_rpcsvcstate == _IDLE) {
138		extern fd_set svc_fdset;
139		static int size;
140		int i, openfd;
141
142		if (_rpcfdtype == SOCK_DGRAM) {
143			unregister();
144			exit(0);
145		}
146		if (size == 0) {
147			size = getdtablesize();
148		}
149		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
150			if (FD_ISSET(i, &svc_fdset))
151				openfd++;
152		if (openfd <= 1) {
153			unregister();
154			exit(0);
155		}
156	}
157	if (_rpcsvcstate == _SERVED)
158		_rpcsvcstate = _IDLE;
159
160	(void) signal(SIGALRM, (SIG_PF) closedown);
161	(void) alarm(_RPCSVC_CLOSEDOWN/2);
162}
163
164main(argc, argv)
165	int argc;
166	char *argv[];
167{
168	register SVCXPRT *transp = NULL;
169	int sock;
170	int proto = 0;
171	struct sockaddr_in saddr;
172	int asize = sizeof (saddr);
173	int ch;
174
175	while ((ch = getopt(argc, argv, "hdnp:")) != EOF) {
176		switch(ch) {
177		case 'd':
178			debug = ypdb_debug = 1;
179			break;
180		case 'n':
181			do_dns = 1;
182			break;
183		case 'p':
184			yp_dir = optarg;
185			break;
186		case 'h':
187		default:
188			usage();
189		}
190	}
191
192	load_securenets();
193	yp_init_async();
194#ifdef DB_CACHE
195	yp_init_dbs();
196#endif
197	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
198		int ssize = sizeof (int);
199
200		if (saddr.sin_family != AF_INET)
201			exit(1);
202		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
203				(char *)&_rpcfdtype, &ssize) == -1)
204			exit(1);
205		sock = 0;
206		_rpcpmstart = 1;
207		proto = 0;
208		openlog(progname, LOG_PID, LOG_DAEMON);
209	} else {
210		if (!debug) {
211			if (daemon(0,0)) {
212				err(1,"cannot fork");
213			}
214			openlog(progname, LOG_PID, LOG_DAEMON);
215		}
216		sock = RPC_ANYSOCK;
217		(void) pmap_unset(YPPROG, YPVERS);
218		(void) pmap_unset(YPPROG, 1);
219	}
220
221	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
222		transp = svcudp_create(sock);
223		if (transp == NULL) {
224			_msgout("cannot create udp service.");
225			exit(1);
226		}
227		if (!_rpcpmstart)
228			proto = IPPROTO_UDP;
229		if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) {
230			_msgout("unable to register (YPPROG, YPOLDVERS, udp).");
231			exit(1);
232		}
233		if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) {
234			_msgout("unable to register (YPPROG, YPVERS, udp).");
235			exit(1);
236		}
237	}
238
239	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
240		transp = svctcp_create(sock, 0, 0);
241		if (transp == NULL) {
242			_msgout("cannot create tcp service.");
243			exit(1);
244		}
245		if (!_rpcpmstart)
246			proto = IPPROTO_TCP;
247		if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) {
248			_msgout("unable to register (YPPROG, YPOLDVERS, tcp).");
249			exit(1);
250		}
251		if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) {
252			_msgout("unable to register (YPPROG, YPVERS, tcp).");
253			exit(1);
254		}
255	}
256
257	if (transp == (SVCXPRT *)NULL) {
258		_msgout("could not create a handle");
259		exit(1);
260	}
261	if (_rpcpmstart) {
262		(void) signal(SIGALRM, (SIG_PF) closedown);
263		(void) alarm(_RPCSVC_CLOSEDOWN/2);
264	}
265/*
266 * Make sure SIGPIPE doesn't blow us away while servicing TCP
267 * connections.
268 */
269	(void) signal(SIGPIPE, SIG_IGN);
270	(void) signal(SIGCHLD, (SIG_PF) reaper);
271	(void) signal(SIGTERM, (SIG_PF) reaper);
272	(void) signal(SIGINT, (SIG_PF) reaper);
273	(void) signal(SIGHUP, (SIG_PF) reaper);
274	yp_svc_run();
275	_msgout("svc_run returned");
276	exit(1);
277	/* NOTREACHED */
278}
279