yp_main.c revision 20100 
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 _rpc_dtablesize __P((void));
83extern int _rpcsvcstate;	 /* Set when a request is serviced */
84char *progname = "ypserv";
85char *yp_dir = _PATH_YP;
86int debug = 0;
87int do_dns = 0;
88
89static
90void _msgout(char* msg)
91{
92	if (debug) {
93		if (_rpcpmstart)
94			syslog(LOG_ERR, msg);
95		else
96			(void) fprintf(stderr, "%s\n", msg);
97	} else
98		syslog(LOG_ERR, msg);
99}
100
101static void
102yp_svc_run()
103{
104#ifdef FD_SETSIZE
105	fd_set readfds;
106#else
107	int readfds;
108#endif /* def FD_SETSIZE */
109	extern int forked;
110	int pid;
111	int fd_setsize = _rpc_dtablesize();
112
113	/* Establish the identity of the parent ypserv process. */
114	pid = getpid();
115
116	for (;;) {
117#ifdef FD_SETSIZE
118		readfds = svc_fdset;
119#else
120		readfds = svc_fds;
121#endif /* def FD_SETSIZE */
122		switch (select(fd_setsize, &readfds, NULL, NULL,
123			       (struct timeval *)0)) {
124		case -1:
125			if (errno == EINTR) {
126				continue;
127			}
128			perror("svc_run: - select failed");
129			return;
130		case 0:
131			continue;
132		default:
133			svc_getreqset(&readfds);
134			if (forked && pid != getpid())
135				exit(0);
136		}
137	}
138}
139
140static void unregister()
141{
142	(void) pmap_unset(YPPROG, YPVERS);
143	(void) pmap_unset(YPPROG, YPOLDVERS);
144}
145
146static void reaper(sig)
147	int sig;
148{
149	int status;
150
151	if (sig == SIGHUP) {
152		load_securenets();
153#ifdef DB_CACHE
154		yp_flush_all();
155#endif
156		return;
157	}
158
159	if (sig == SIGCHLD) {
160		while (wait3(&status, WNOHANG, NULL) > 0)
161			children--;
162	} else {
163		unregister();
164		exit(0);
165	}
166}
167
168static void usage()
169{
170	fprintf(stderr, "Usage: %s [-h] [-d] [-n] [-p path]\n", progname);
171	exit(1);
172}
173
174static void
175closedown(int sig)
176{
177	if (_rpcsvcstate == _IDLE) {
178		extern fd_set svc_fdset;
179		static int size;
180		int i, openfd;
181
182		if (_rpcfdtype == SOCK_DGRAM) {
183			unregister();
184			exit(0);
185		}
186		if (size == 0) {
187			size = getdtablesize();
188		}
189		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
190			if (FD_ISSET(i, &svc_fdset))
191				openfd++;
192		if (openfd <= 1) {
193			unregister();
194			exit(0);
195		}
196	}
197	if (_rpcsvcstate == _SERVED)
198		_rpcsvcstate = _IDLE;
199
200	(void) signal(SIGALRM, (SIG_PF) closedown);
201	(void) alarm(_RPCSVC_CLOSEDOWN/2);
202}
203
204main(argc, argv)
205	int argc;
206	char *argv[];
207{
208	register SVCXPRT *transp = NULL;
209	int sock;
210	int proto = 0;
211	struct sockaddr_in saddr;
212	int asize = sizeof (saddr);
213	int ch;
214
215	while ((ch = getopt(argc, argv, "hdnp:")) != EOF) {
216		switch(ch) {
217		case 'd':
218			debug = ypdb_debug = 1;
219			break;
220		case 'n':
221			do_dns = 1;
222			break;
223		case 'p':
224			yp_dir = optarg;
225			break;
226		case 'h':
227		default:
228			usage();
229		}
230	}
231
232	load_securenets();
233#ifdef DB_CACHE
234	yp_init_dbs();
235#endif
236	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
237		int ssize = sizeof (int);
238
239		if (saddr.sin_family != AF_INET)
240			exit(1);
241		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
242				(char *)&_rpcfdtype, &ssize) == -1)
243			exit(1);
244		sock = 0;
245		_rpcpmstart = 1;
246		proto = 0;
247		openlog(progname, LOG_PID, LOG_DAEMON);
248	} else {
249		if (!debug) {
250			if (daemon(0,0)) {
251				err(1,"cannot fork");
252			}
253			openlog(progname, LOG_PID, LOG_DAEMON);
254		}
255		sock = RPC_ANYSOCK;
256		(void) pmap_unset(YPPROG, YPVERS);
257		(void) pmap_unset(YPPROG, 1);
258	}
259
260	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
261		transp = svcudp_create(sock);
262		if (transp == NULL) {
263			_msgout("cannot create udp service.");
264			exit(1);
265		}
266		if (!_rpcpmstart)
267			proto = IPPROTO_UDP;
268		if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) {
269			_msgout("unable to register (YPPROG, YPOLDVERS, udp).");
270			exit(1);
271		}
272		if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) {
273			_msgout("unable to register (YPPROG, YPVERS, udp).");
274			exit(1);
275		}
276	}
277
278	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
279		transp = svctcp_create(sock, 0, 0);
280		if (transp == NULL) {
281			_msgout("cannot create tcp service.");
282			exit(1);
283		}
284		if (!_rpcpmstart)
285			proto = IPPROTO_TCP;
286		if (!svc_register(transp, YPPROG, YPOLDVERS, ypprog_1, proto)) {
287			_msgout("unable to register (YPPROG, YPOLDVERS, tcp).");
288			exit(1);
289		}
290		if (!svc_register(transp, YPPROG, YPVERS, ypprog_2, proto)) {
291			_msgout("unable to register (YPPROG, YPVERS, tcp).");
292			exit(1);
293		}
294	}
295
296	if (transp == (SVCXPRT *)NULL) {
297		_msgout("could not create a handle");
298		exit(1);
299	}
300	if (_rpcpmstart) {
301		(void) signal(SIGALRM, (SIG_PF) closedown);
302		(void) alarm(_RPCSVC_CLOSEDOWN/2);
303	}
304/*
305 * Make sure SIGPIPE doesn't blow us away while servicing TCP
306 * connections.
307 */
308	(void) signal(SIGPIPE, SIG_IGN);
309	(void) signal(SIGCHLD, (SIG_PF) reaper);
310	(void) signal(SIGTERM, (SIG_PF) reaper);
311	(void) signal(SIGINT, (SIG_PF) reaper);
312	(void) signal(SIGHUP, (SIG_PF) reaper);
313	yp_svc_run();
314	_msgout("svc_run returned");
315	exit(1);
316	/* NOTREACHED */
317}
318