ypxfrd_main.c revision 24428 
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: ypxfrd_main.c,v 1.4 1997/03/11 15:56:48 peter Exp $
33 */
34
35#include "ypxfrd.h"
36#include <stdio.h>
37#include <stdlib.h> /* getenv, exit */
38#include <unistd.h>
39#include <rpc/pmap_clnt.h> /* for pmap_unset */
40#include <string.h> /* strcmp */
41#include <signal.h>
42#include <sys/ttycom.h> /* TIOCNOTTY */
43#ifdef __cplusplus
44#include <sysent.h> /* getdtablesize, open */
45#endif /* __cplusplus */
46#include <memory.h>
47#include <sys/socket.h>
48#include <netinet/in.h>
49#include <syslog.h>
50#include "ypxfrd_extern.h"
51#include <sys/wait.h>
52#include <errno.h>
53
54#ifndef SIG_PF
55#define	SIG_PF void(*)(int)
56#endif
57
58#ifdef DEBUG
59#define	RPC_SVC_FG
60#endif
61
62#define	_RPCSVC_CLOSEDOWN 120
63#ifndef lint
64static const char rcsid[] = "$Id: ypxfrd_main.c,v 1.4 1997/03/11 15:56:48 peter Exp $";
65#endif /* not lint */
66int _rpcpmstart;		/* Started by a port monitor ? */
67static int _rpcfdtype;
68		 /* Whether Stream or Datagram ? */
69	/* States a server can be in wrt request */
70
71#define	_IDLE 0
72#define	_SERVED 1
73#define	_SERVING 2
74
75extern int _rpcsvcstate;	 /* Set when a request is serviced */
76
77char *progname = "rpc.ypxfrd";
78char *yp_dir = "/var/yp/";
79
80static
81void _msgout(char* msg)
82{
83#ifdef RPC_SVC_FG
84	if (_rpcpmstart)
85		syslog(LOG_ERR, msg);
86	else
87		(void) fprintf(stderr, "%s\n", msg);
88#else
89	syslog(LOG_ERR, msg);
90#endif
91}
92
93static void
94closedown(int sig)
95{
96	if (_rpcsvcstate == _IDLE) {
97		extern fd_set svc_fdset;
98		static int size;
99		int i, openfd;
100
101		if (_rpcfdtype == SOCK_DGRAM)
102			exit(0);
103		if (size == 0) {
104			size = getdtablesize();
105		}
106		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
107			if (FD_ISSET(i, &svc_fdset))
108				openfd++;
109		if (openfd <= 1)
110			exit(0);
111	}
112	if (_rpcsvcstate == _SERVED)
113		_rpcsvcstate = _IDLE;
114
115	(void) signal(SIGALRM, (SIG_PF) closedown);
116	(void) alarm(_RPCSVC_CLOSEDOWN/2);
117}
118
119
120static void
121ypxfrd_svc_run()
122{
123#ifdef FD_SETSIZE
124	fd_set readfds;
125#else
126	int readfds;
127#endif /* def FD_SETSIZE */
128	extern int forked;
129	int pid;
130	int fd_setsize = _rpc_dtablesize();
131
132	/* Establish the identity of the parent ypserv process. */
133	pid = getpid();
134
135	for (;;) {
136#ifdef FD_SETSIZE
137		readfds = svc_fdset;
138#else
139		readfds = svc_fds;
140#endif /* def FD_SETSIZE */
141		switch (select(fd_setsize, &readfds, NULL, NULL,
142			       (struct timeval *)0)) {
143		case -1:
144			if (errno == EINTR) {
145				continue;
146			}
147			perror("svc_run: - select failed");
148			return;
149		case 0:
150			continue;
151		default:
152			svc_getreqset(&readfds);
153			if (forked && pid != getpid())
154				exit(0);
155		}
156	}
157}
158
159static void reaper(sig)
160	int sig;
161{
162	int status;
163
164	if (sig == SIGHUP) {
165		load_securenets();
166		return;
167	}
168
169	if (sig == SIGCHLD) {
170		while (wait3(&status, WNOHANG, NULL) > 0)
171			children--;
172	} else {
173		(void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
174		exit(0);
175	}
176}
177
178void usage()
179{
180	fprintf(stderr, "%s [-p path]\n", progname);
181	exit(0);
182}
183
184main(argc, argv)
185	int argc;
186	char *argv[];
187{
188	register SVCXPRT *transp;
189	int sock;
190	int proto;
191	struct sockaddr_in saddr;
192	int asize = sizeof (saddr);
193	int ch;
194
195	while ((ch = getopt(argc, argv, "p:h")) != -1) {
196		switch(ch) {
197		case 'p':
198			yp_dir = optarg;
199			break;
200		default:
201			usage();
202			break;
203		}
204	}
205
206	load_securenets();
207
208	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
209		int ssize = sizeof (int);
210
211		if (saddr.sin_family != AF_INET)
212			exit(1);
213		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
214				(char *)&_rpcfdtype, &ssize) == -1)
215			exit(1);
216		sock = 0;
217		_rpcpmstart = 1;
218		proto = 0;
219		openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
220	} else {
221#ifndef RPC_SVC_FG
222		int size;
223		int pid, i;
224
225		pid = fork();
226		if (pid < 0) {
227			perror("cannot fork");
228			exit(1);
229		}
230		if (pid)
231			exit(0);
232		size = getdtablesize();
233		for (i = 0; i < size; i++)
234			(void) close(i);
235		i = open("/dev/console", 2);
236		(void) dup2(i, 1);
237		(void) dup2(i, 2);
238		i = open("/dev/tty", 2);
239		if (i >= 0) {
240			(void) ioctl(i, TIOCNOTTY, (char *)NULL);
241			(void) close(i);
242		}
243		openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
244#endif
245		sock = RPC_ANYSOCK;
246		(void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
247	}
248
249	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
250		transp = svcudp_create(sock);
251		if (transp == NULL) {
252			_msgout("cannot create udp service.");
253			exit(1);
254		}
255		if (!_rpcpmstart)
256			proto = IPPROTO_UDP;
257		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
258			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp).");
259			exit(1);
260		}
261	}
262
263	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
264		transp = svctcp_create(sock, 0, 0);
265		if (transp == NULL) {
266			_msgout("cannot create tcp service.");
267			exit(1);
268		}
269		if (!_rpcpmstart)
270			proto = IPPROTO_TCP;
271		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
272			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp).");
273			exit(1);
274		}
275	}
276
277	if (transp == (SVCXPRT *)NULL) {
278		_msgout("could not create a handle");
279		exit(1);
280	}
281	if (_rpcpmstart) {
282		(void) signal(SIGALRM, (SIG_PF) closedown);
283		(void) alarm(_RPCSVC_CLOSEDOWN/2);
284	}
285
286	(void) signal(SIGPIPE, SIG_IGN);
287	(void) signal(SIGCHLD, (SIG_PF) reaper);
288	(void) signal(SIGTERM, (SIG_PF) reaper);
289	(void) signal(SIGINT, (SIG_PF) reaper);
290	(void) signal(SIGHUP, (SIG_PF) reaper);
291
292	ypxfrd_svc_run();
293	_msgout("svc_run returned");
294	exit(1);
295	/* NOTREACHED */
296}
297