ypupdated_main.c revision 26236 
1/*
2 * Copyright (c) 1995, 1996
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: ypupdated_main.c,v 1.1 1996/12/25 19:31:28 wpaul Exp wpaul $
33 */
34
35#include "ypupdate_prot.h"
36#include <stdio.h>
37#include <stdlib.h> /* getenv, exit */
38#include <rpc/pmap_clnt.h> /* for pmap_unset */
39#include <string.h> /* strcmp */
40#include <signal.h>
41#include <sys/ttycom.h> /* TIOCNOTTY */
42#ifdef __cplusplus
43#include <sysent.h> /* getdtablesize, open */
44#endif /* __cplusplus */
45#include <memory.h>
46#include <sys/socket.h>
47#include <netinet/in.h>
48#include <syslog.h>
49#include <sys/wait.h>
50#include <errno.h>
51#include <err.h>
52#include <stdlib.h>
53#include <unistd.h>
54#include "ypupdated_extern.h"
55#include "yp_extern.h"
56
57#ifndef SIG_PF
58#define	SIG_PF void(*)(int)
59#endif
60
61#ifdef DEBUG
62#define	RPC_SVC_FG
63#endif
64
65#define	_RPCSVC_CLOSEDOWN 120
66#ifndef lint
67static const char rcsid[] = "$Id: ypupdated_main.c,v 1.1 1996/12/25 19:31:28 wpaul Exp wpaul $";
68#endif /* not lint */
69int _rpcpmstart;		/* Started by a port monitor ? */
70static int _rpcfdtype;
71		 /* Whether Stream or Datagram ? */
72	/* States a server can be in wrt request */
73
74#define	_IDLE 0
75#define	_SERVED 1
76#define	_SERVING 2
77
78extern int _rpcsvcstate;	 /* Set when a request is serviced */
79
80char *progname = "rpc.ypupdated";
81char *yp_dir = "/var/yp/";
82
83static
84void _msgout(char* msg)
85{
86#ifdef RPC_SVC_FG
87	if (_rpcpmstart)
88		syslog(LOG_ERR, msg);
89	else
90		(void) fprintf(stderr, "%s\n", msg);
91#else
92	syslog(LOG_ERR, msg);
93#endif
94}
95
96static void
97closedown(int sig)
98{
99	if (_rpcsvcstate == _IDLE) {
100		extern fd_set svc_fdset;
101		static int size;
102		int i, openfd;
103
104		if (_rpcfdtype == SOCK_DGRAM)
105			exit(0);
106		if (size == 0) {
107			size = getdtablesize();
108		}
109		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
110			if (FD_ISSET(i, &svc_fdset))
111				openfd++;
112		if (openfd <= 1)
113			exit(0);
114	}
115	if (_rpcsvcstate == _SERVED)
116		_rpcsvcstate = _IDLE;
117
118	(void) signal(SIGALRM, (SIG_PF) closedown);
119	(void) alarm(_RPCSVC_CLOSEDOWN/2);
120}
121
122static void
123ypupdated_svc_run()
124{
125#ifdef FD_SETSIZE
126	fd_set readfds;
127#else
128	int readfds;
129#endif /* def FD_SETSIZE */
130	extern int forked;
131	int pid;
132	int fd_setsize = _rpc_dtablesize();
133
134	/* Establish the identity of the parent ypupdated process. */
135	pid = getpid();
136
137	for (;;) {
138#ifdef FD_SETSIZE
139		readfds = svc_fdset;
140#else
141		readfds = svc_fds;
142#endif /* def FD_SETSIZE */
143		switch (select(fd_setsize, &readfds, NULL, NULL,
144			       (struct timeval *)0)) {
145		case -1:
146			if (errno == EINTR) {
147				continue;
148			}
149			perror("svc_run: - select failed");
150			return;
151		case 0:
152			continue;
153		default:
154			svc_getreqset(&readfds);
155			if (forked && pid != getpid())
156				exit(0);
157		}
158	}
159}
160
161static void reaper(sig)
162	int sig;
163{
164	int status;
165
166	if (sig == SIGHUP) {
167#ifdef foo
168		load_securenets();
169#endif
170		return;
171	}
172
173	if (sig == SIGCHLD) {
174		while (wait3(&status, WNOHANG, NULL) > 0)
175			children--;
176	} else {
177		(void) pmap_unset(YPU_PROG, YPU_VERS);
178		exit(0);
179	}
180}
181
182void usage()
183{
184	fprintf(stderr, "%s [-p path]\n", progname);
185	exit(0);
186}
187
188main(argc, argv)
189	int argc;
190	char *argv[];
191{
192	register SVCXPRT *transp = NULL;
193	int sock;
194	int proto = 0;
195	struct sockaddr_in saddr;
196	int asize = sizeof (saddr);
197	int ch;
198
199	while ((ch = getopt(argc, argv, "p:h")) != EOF) {
200		switch(ch) {
201		case 'p':
202			yp_dir = optarg;
203			break;
204		default:
205			usage();
206			break;
207		}
208	}
209#ifdef foo
210	load_securenets();
211#endif
212
213	if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) {
214		yp_error("failed to register AUTH_DES flavor");
215		exit(1);
216	}
217
218	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
219		int ssize = sizeof (int);
220
221		if (saddr.sin_family != AF_INET)
222			exit(1);
223		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
224				(char *)&_rpcfdtype, &ssize) == -1)
225			exit(1);
226		sock = 0;
227		_rpcpmstart = 1;
228		proto = 0;
229		openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON);
230	} else {
231#ifndef RPC_SVC_FG
232		if (daemon(0,0)) {
233			err(1, "cannot fork");
234		}
235		openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON);
236#endif
237		sock = RPC_ANYSOCK;
238		(void) pmap_unset(YPU_PROG, YPU_VERS);
239	}
240
241	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
242		transp = svcudp_create(sock);
243		if (transp == NULL) {
244			_msgout("cannot create udp service.");
245			exit(1);
246		}
247		if (!_rpcpmstart)
248			proto = IPPROTO_UDP;
249		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
250			_msgout("unable to register (YPU_PROG, YPU_VERS, udp).");
251			exit(1);
252		}
253	}
254
255	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
256		transp = svctcp_create(sock, 0, 0);
257		if (transp == NULL) {
258			_msgout("cannot create tcp service.");
259			exit(1);
260		}
261		if (!_rpcpmstart)
262			proto = IPPROTO_TCP;
263		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
264			_msgout("unable to register (YPU_PROG, YPU_VERS, tcp).");
265			exit(1);
266		}
267	}
268
269	if (transp == (SVCXPRT *)NULL) {
270		_msgout("could not create a handle");
271		exit(1);
272	}
273	if (_rpcpmstart) {
274		(void) signal(SIGALRM, (SIG_PF) closedown);
275		(void) alarm(_RPCSVC_CLOSEDOWN/2);
276	}
277
278	(void) signal(SIGPIPE, SIG_IGN);
279	(void) signal(SIGCHLD, (SIG_PF) reaper);
280	(void) signal(SIGTERM, (SIG_PF) reaper);
281	(void) signal(SIGINT, (SIG_PF) reaper);
282	(void) signal(SIGHUP, (SIG_PF) reaper);
283
284	ypupdated_svc_run();
285	_msgout("svc_run returned");
286	exit(1);
287	/* NOTREACHED */
288}
289