yp_main.c revision 50479 
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
33#ifndef lint
34static const char rcsid[] =
35  "$FreeBSD: head/usr.sbin/ypserv/yp_main.c 50479 1999-08-28 01:35:59Z peter $";
36#endif /* not lint */
37
38/*
39 * ypserv startup function.
40 * We need out own main() since we have to do some additional work
41 * that rpcgen won't do for us. Most of this file was generated using
42 * rpcgen.new, and later modified.
43 */
44
45#include "yp.h"
46#include <err.h>
47#include <errno.h>
48#include <memory.h>
49#include <stdio.h>
50#include <signal.h>
51#include <stdlib.h> /* getenv, exit */
52#include <string.h> /* strcmp */
53#include <syslog.h>
54#include <unistd.h>
55#include <rpc/pmap_clnt.h> /* for pmap_unset */
56#include <sys/ttycom.h> /* TIOCNOTTY */
57#ifdef __cplusplus
58#include <sysent.h> /* getdtablesize, open */
59#endif /* __cplusplus */
60#include <sys/socket.h>
61#include <netinet/in.h>
62#include <sys/wait.h>
63#include "yp_extern.h"
64#include <rpc/rpc.h>
65
66#ifndef SIG_PF
67#define	SIG_PF void(*)(int)
68#endif
69
70#define	_RPCSVC_CLOSEDOWN 120
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 _rpc_dtablesize __P((void));
83extern int _rpcsvcstate;	 /* Set when a request is serviced */
84char *progname = "ypserv";
85char *yp_dir = _PATH_YP;
86/*int debug = 0;*/
87int do_dns = 0;
88int resfd;
89
90static
91void _msgout(char* msg)
92{
93	if (debug) {
94		if (_rpcpmstart)
95			syslog(LOG_ERR, msg);
96		else
97			warnx("%s", msg);
98	} else
99		syslog(LOG_ERR, msg);
100}
101
102pid_t	yp_pid;
103
104static void
105yp_svc_run()
106{
107#ifdef FD_SETSIZE
108	fd_set readfds;
109#else
110	int readfds;
111#endif /* def FD_SETSIZE */
112	extern int forked;
113	int fd_setsize = _rpc_dtablesize();
114	struct timeval timeout;
115
116	/* Establish the identity of the parent ypserv process. */
117	yp_pid = getpid();
118
119	for (;;) {
120#ifdef FD_SETSIZE
121		readfds = svc_fdset;
122#else
123		readfds = svc_fds;
124#endif /* def FD_SETSIZE */
125
126		FD_SET(resfd, &readfds);
127
128		timeout.tv_sec = RESOLVER_TIMEOUT;
129		timeout.tv_usec = 0;
130		switch (select(fd_setsize, &readfds, NULL, NULL,
131			       &timeout)) {
132		case -1:
133			if (errno == EINTR) {
134				continue;
135			}
136			warn("svc_run: - select failed");
137			return;
138		case 0:
139			if (getpid() == yp_pid)
140				yp_prune_dnsq();
141			break;
142		default:
143			if (getpid() == yp_pid) {
144				if (FD_ISSET(resfd, &readfds)) {
145					yp_run_dnsq();
146					FD_CLR(resfd, &readfds);
147				}
148				svc_getreqset(&readfds);
149			}
150		}
151		if (yp_pid != getpid())
152			_exit(0);
153	}
154}
155
156static void unregister()
157{
158	(void) pmap_unset(YPPROG, YPVERS);
159	(void) pmap_unset(YPPROG, YPOLDVERS);
160}
161
162static void reaper(sig)
163	int sig;
164{
165	int			status;
166	int			saved_errno;
167
168	saved_errno = errno;
169
170	if (sig == SIGHUP) {
171		load_securenets();
172#ifdef DB_CACHE
173		yp_flush_all();
174#endif
175		errno = saved_errno;
176		return;
177	}
178
179	if (sig == SIGCHLD) {
180		while (wait3(&status, WNOHANG, NULL) > 0)
181			children--;
182	} else {
183		unregister();
184		exit(0);
185	}
186	errno = saved_errno;
187	return;
188}
189
190static void usage()
191{
192	fprintf(stderr, "usage: ypserv [-h] [-d] [-n] [-p path]\n");
193	exit(1);
194}
195
196static void
197closedown(int sig)
198{
199	if (_rpcsvcstate == _IDLE) {
200		extern fd_set svc_fdset;
201		static int size;
202		int i, openfd;
203
204		if (_rpcfdtype == SOCK_DGRAM) {
205			unregister();
206			exit(0);
207		}
208		if (size == 0) {
209			size = getdtablesize();
210		}
211		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
212			if (FD_ISSET(i, &svc_fdset))
213				openfd++;
214		if (openfd <= 1) {
215			unregister();
216			exit(0);
217		}
218	}
219	if (_rpcsvcstate == _SERVED)
220		_rpcsvcstate = _IDLE;
221
222	(void) signal(SIGALRM, (SIG_PF) closedown);
223	(void) alarm(_RPCSVC_CLOSEDOWN/2);
224}
225
226int
227main(argc, argv)
228	int argc;
229	char *argv[];
230{
231	register SVCXPRT *transp = NULL;
232	int sock;
233	int proto = 0;
234	struct sockaddr_in saddr;
235	int asize = sizeof (saddr);
236	int ch;
237
238	while ((ch = getopt(argc, argv, "hdnp:")) != -1) {
239		switch(ch) {
240		case 'd':
241			debug = ypdb_debug = 1;
242			break;
243		case 'n':
244			do_dns = 1;
245			break;
246		case 'p':
247			yp_dir = optarg;
248			break;
249		case 'h':
250		default:
251			usage();
252		}
253	}
254
255	load_securenets();
256	yp_init_resolver();
257#ifdef DB_CACHE
258	yp_init_dbs();
259#endif
260	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
261		int ssize = sizeof (int);
262
263		if (saddr.sin_family != AF_INET)
264			exit(1);
265		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
266				(char *)&_rpcfdtype, &ssize) == -1)
267			exit(1);
268		sock = 0;
269		_rpcpmstart = 1;
270		proto = 0;
271		openlog("ypserv", LOG_PID, LOG_DAEMON);
272	} else {
273		if (!debug) {
274			if (daemon(0,0)) {
275				err(1,"cannot fork");
276			}
277			openlog("ypserv", LOG_PID, LOG_DAEMON);
278		}
279		sock = RPC_ANYSOCK;
280		(void) pmap_unset(YPPROG, YPVERS);
281		(void) pmap_unset(YPPROG, 1);
282	}
283
284	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
285		transp = svcudp_create(sock);
286		if (transp == NULL) {
287			_msgout("cannot create udp service");
288			exit(1);
289		}
290		if (!_rpcpmstart)
291			proto = IPPROTO_UDP;
292		if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) {
293			_msgout("unable to register (YPPROG, YPOLDVERS, udp)");
294			exit(1);
295		}
296		if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) {
297			_msgout("unable to register (YPPROG, YPVERS, udp)");
298			exit(1);
299		}
300	}
301
302	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
303		transp = svctcp_create(sock, 0, 0);
304		if (transp == NULL) {
305			_msgout("cannot create tcp service");
306			exit(1);
307		}
308		if (!_rpcpmstart)
309			proto = IPPROTO_TCP;
310		if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) {
311			_msgout("unable to register (YPPROG, YPOLDVERS, tcp)");
312			exit(1);
313		}
314		if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) {
315			_msgout("unable to register (YPPROG, YPVERS, tcp)");
316			exit(1);
317		}
318	}
319
320	if (transp == (SVCXPRT *)NULL) {
321		_msgout("could not create a handle");
322		exit(1);
323	}
324	if (_rpcpmstart) {
325		(void) signal(SIGALRM, (SIG_PF) closedown);
326		(void) alarm(_RPCSVC_CLOSEDOWN/2);
327	}
328/*
329 * Make sure SIGPIPE doesn't blow us away while servicing TCP
330 * connections.
331 */
332	(void) signal(SIGPIPE, SIG_IGN);
333	(void) signal(SIGCHLD, (SIG_PF) reaper);
334	(void) signal(SIGTERM, (SIG_PF) reaper);
335	(void) signal(SIGINT, (SIG_PF) reaper);
336	(void) signal(SIGHUP, (SIG_PF) reaper);
337	yp_svc_run();
338	_msgout("svc_run returned");
339	exit(1);
340	/* NOTREACHED */
341}
342