ypupdated_main.c revision 50479 
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
33#ifndef lint
34static const char rcsid[] =
35  "$FreeBSD: head/usr.sbin/rpc.ypupdated/ypupdated_main.c 50479 1999-08-28 01:35:59Z peter $";
36#endif /* not lint */
37
38#include "ypupdate_prot.h"
39#include <stdio.h>
40#include <stdlib.h> /* getenv, exit */
41#include <rpc/pmap_clnt.h> /* for pmap_unset */
42#include <string.h> /* strcmp */
43#include <signal.h>
44#include <sys/ttycom.h> /* TIOCNOTTY */
45#ifdef __cplusplus
46#include <sysent.h> /* getdtablesize, open */
47#endif /* __cplusplus */
48#include <memory.h>
49#include <sys/socket.h>
50#include <netinet/in.h>
51#include <syslog.h>
52#include <sys/wait.h>
53#include <errno.h>
54#include <err.h>
55#include <stdlib.h>
56#include <unistd.h>
57#include "ypupdated_extern.h"
58#include "yp_extern.h"
59
60#ifndef SIG_PF
61#define	SIG_PF void(*)(int)
62#endif
63
64#ifdef DEBUG
65#define	RPC_SVC_FG
66#endif
67
68#define	_RPCSVC_CLOSEDOWN 120
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		warnx("%s", 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			warn("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, "rpc.ypupdatedd [-p path]\n");
185	exit(0);
186}
187
188int
189main(argc, argv)
190	int argc;
191	char *argv[];
192{
193	register SVCXPRT *transp = NULL;
194	int sock;
195	int proto = 0;
196	struct sockaddr_in saddr;
197	int asize = sizeof (saddr);
198	int ch;
199
200	while ((ch = getopt(argc, argv, "p:h")) != -1) {
201		switch(ch) {
202		case 'p':
203			yp_dir = optarg;
204			break;
205		default:
206			usage();
207			break;
208		}
209	}
210#ifdef foo
211	load_securenets();
212#endif
213
214	if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) {
215		yp_error("failed to register AUTH_DES flavor");
216		exit(1);
217	}
218
219	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
220		int ssize = sizeof (int);
221
222		if (saddr.sin_family != AF_INET)
223			exit(1);
224		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
225				(char *)&_rpcfdtype, &ssize) == -1)
226			exit(1);
227		sock = 0;
228		_rpcpmstart = 1;
229		proto = 0;
230		openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON);
231	} else {
232#ifndef RPC_SVC_FG
233		if (daemon(0,0)) {
234			err(1, "cannot fork");
235		}
236		openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON);
237#endif
238		sock = RPC_ANYSOCK;
239		(void) pmap_unset(YPU_PROG, YPU_VERS);
240	}
241
242	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
243		transp = svcudp_create(sock);
244		if (transp == NULL) {
245			_msgout("cannot create udp service.");
246			exit(1);
247		}
248		if (!_rpcpmstart)
249			proto = IPPROTO_UDP;
250		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
251			_msgout("unable to register (YPU_PROG, YPU_VERS, udp).");
252			exit(1);
253		}
254	}
255
256	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
257		transp = svctcp_create(sock, 0, 0);
258		if (transp == NULL) {
259			_msgout("cannot create tcp service.");
260			exit(1);
261		}
262		if (!_rpcpmstart)
263			proto = IPPROTO_TCP;
264		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
265			_msgout("unable to register (YPU_PROG, YPU_VERS, tcp).");
266			exit(1);
267		}
268	}
269
270	if (transp == (SVCXPRT *)NULL) {
271		_msgout("could not create a handle");
272		exit(1);
273	}
274	if (_rpcpmstart) {
275		(void) signal(SIGALRM, (SIG_PF) closedown);
276		(void) alarm(_RPCSVC_CLOSEDOWN/2);
277	}
278
279	(void) signal(SIGPIPE, SIG_IGN);
280	(void) signal(SIGCHLD, (SIG_PF) reaper);
281	(void) signal(SIGTERM, (SIG_PF) reaper);
282	(void) signal(SIGINT, (SIG_PF) reaper);
283	(void) signal(SIGHUP, (SIG_PF) reaper);
284
285	ypupdated_svc_run();
286	_msgout("svc_run returned");
287	exit(1);
288	/* NOTREACHED */
289}
290