ypupdated_main.c revision 90297 
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 90297 2002-02-06 13:30:31Z des $";
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#ifdef __cplusplus
45#include <sysent.h> /* getdtablesize, open */
46#endif /* __cplusplus */
47#include <memory.h>
48#include <sys/socket.h>
49#include <netinet/in.h>
50#include <syslog.h>
51#include <sys/wait.h>
52#include <errno.h>
53#include <err.h>
54#include <stdlib.h>
55#include <unistd.h>
56#include "ypupdated_extern.h"
57#include "yp_extern.h"
58
59#ifndef SIG_PF
60#define	SIG_PF void(*)(int)
61#endif
62
63#ifdef DEBUG
64#define	RPC_SVC_FG
65#endif
66
67#define	_RPCSVC_CLOSEDOWN 120
68int _rpcpmstart;		/* Started by a port monitor ? */
69static int _rpcfdtype;
70		 /* Whether Stream or Datagram ? */
71	/* States a server can be in wrt request */
72
73#define	_IDLE 0
74#define	_SERVED 1
75#define	_SERVING 2
76
77extern int _rpcsvcstate;	 /* Set when a request is serviced */
78
79char *progname = "rpc.ypupdated";
80char *yp_dir = "/var/yp/";
81
82static
83void _msgout(char* msg)
84{
85#ifdef RPC_SVC_FG
86	if (_rpcpmstart)
87		syslog(LOG_ERR, "%s", msg);
88	else
89		warnx("%s", msg);
90#else
91	syslog(LOG_ERR, "%s", msg);
92#endif
93}
94
95static void
96closedown(int sig)
97{
98	if (_rpcsvcstate == _IDLE) {
99		extern fd_set svc_fdset;
100		static int size;
101		int i, openfd;
102
103		if (_rpcfdtype == SOCK_DGRAM)
104			exit(0);
105		if (size == 0) {
106			size = getdtablesize();
107		}
108		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
109			if (FD_ISSET(i, &svc_fdset))
110				openfd++;
111		if (openfd <= 1)
112			exit(0);
113	}
114	if (_rpcsvcstate == _SERVED)
115		_rpcsvcstate = _IDLE;
116
117	(void) signal(SIGALRM, (SIG_PF) closedown);
118	(void) alarm(_RPCSVC_CLOSEDOWN/2);
119}
120
121static void
122ypupdated_svc_run()
123{
124#ifdef FD_SETSIZE
125	fd_set readfds;
126#else
127	int readfds;
128#endif /* def FD_SETSIZE */
129	extern int forked;
130	int pid;
131	int fd_setsize = _rpc_dtablesize();
132
133	/* Establish the identity of the parent ypupdated process. */
134	pid = getpid();
135
136	for (;;) {
137#ifdef FD_SETSIZE
138		readfds = svc_fdset;
139#else
140		readfds = svc_fds;
141#endif /* def FD_SETSIZE */
142		switch (select(fd_setsize, &readfds, NULL, NULL,
143			       (struct timeval *)0)) {
144		case -1:
145			if (errno == EINTR) {
146				continue;
147			}
148			warn("svc_run: - select failed");
149			return;
150		case 0:
151			continue;
152		default:
153			svc_getreqset(&readfds);
154			if (forked && pid != getpid())
155				exit(0);
156		}
157	}
158}
159
160static void reaper(sig)
161	int sig;
162{
163	int status;
164
165	if (sig == SIGHUP) {
166#ifdef foo
167		load_securenets();
168#endif
169		return;
170	}
171
172	if (sig == SIGCHLD) {
173		while (wait3(&status, WNOHANG, NULL) > 0)
174			children--;
175	} else {
176		(void) pmap_unset(YPU_PROG, YPU_VERS);
177		exit(0);
178	}
179}
180
181void usage()
182{
183	fprintf(stderr, "rpc.ypupdatedd [-p path]\n");
184	exit(0);
185}
186
187int
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")) != -1) {
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