ypxfrd_main.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-4-Clause
3 *
4 * Copyright (c) 1995, 1996
5 *	Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by Bill Paul.
18 * 4. Neither the name of the author nor the names of any co-contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD: stable/11/usr.sbin/rpc.ypxfrd/ypxfrd_main.c 330897 2018-03-14 03:19:51Z eadler $");
37
38#include "ypxfrd.h"
39#include <err.h>
40#include <fcntl.h>
41#include <paths.h>
42#include <stdio.h>
43#include <stdlib.h> /* getenv, exit */
44#include <unistd.h>
45#include <rpc/pmap_clnt.h> /* for pmap_unset */
46#include <rpc/rpc_com.h>
47#include <string.h> /* strcmp */
48#include <signal.h>
49#include <sys/ttycom.h> /* TIOCNOTTY */
50#ifdef __cplusplus
51#include <sysent.h> /* getdtablesize, open */
52#endif /* __cplusplus */
53#include <memory.h>
54#include <sys/socket.h>
55#include <netinet/in.h>
56#include <syslog.h>
57#include "ypxfrd_extern.h"
58#include <sys/wait.h>
59#include <errno.h>
60
61#ifndef SIG_PF
62#define	SIG_PF void(*)(int)
63#endif
64
65#ifdef DEBUG
66#define	RPC_SVC_FG
67#endif
68
69#define	_RPCSVC_CLOSEDOWN 120
70int _rpcpmstart;		/* Started by a port monitor ? */
71static int _rpcfdtype;
72		 /* Whether Stream or Datagram ? */
73	/* States a server can be in wrt request */
74
75#define	_IDLE 0
76#define	_SERVED 1
77#define	_SERVING 2
78
79extern int _rpcsvcstate;	 /* Set when a request is serviced */
80
81char *progname = "rpc.ypxfrd";
82char *yp_dir = "/var/yp/";
83
84static void
85_msgout(char *msg)
86{
87#ifdef RPC_SVC_FG
88	if (_rpcpmstart)
89		syslog(LOG_ERR, "%s", msg);
90	else
91		warnx("%s", msg);
92#else
93	syslog(LOG_ERR, "%s", msg);
94#endif
95}
96
97static void
98closedown(int sig)
99{
100	if (_rpcsvcstate == _IDLE) {
101		extern fd_set svc_fdset;
102		static int size;
103		int i, openfd;
104
105		if (_rpcfdtype == SOCK_DGRAM)
106			exit(0);
107		if (size == 0) {
108			size = getdtablesize();
109		}
110		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
111			if (FD_ISSET(i, &svc_fdset))
112				openfd++;
113		if (openfd <= 1)
114			exit(0);
115	}
116	if (_rpcsvcstate == _SERVED)
117		_rpcsvcstate = _IDLE;
118
119	(void) signal(SIGALRM, (SIG_PF) closedown);
120	(void) alarm(_RPCSVC_CLOSEDOWN/2);
121}
122
123
124static void
125ypxfrd_svc_run(void)
126{
127#ifdef FD_SETSIZE
128	fd_set readfds;
129#else
130	int readfds;
131#endif /* def FD_SETSIZE */
132	extern int forked;
133	int pid;
134	int fd_setsize = _rpc_dtablesize();
135
136	/* Establish the identity of the parent ypserv process. */
137	pid = getpid();
138
139	for (;;) {
140#ifdef FD_SETSIZE
141		readfds = svc_fdset;
142#else
143		readfds = svc_fds;
144#endif /* def FD_SETSIZE */
145		switch (select(fd_setsize, &readfds, NULL, NULL,
146			       (struct timeval *)0)) {
147		case -1:
148			if (errno == EINTR) {
149				continue;
150			}
151			warn("svc_run: - select failed");
152			return;
153		case 0:
154			continue;
155		default:
156			svc_getreqset(&readfds);
157			if (forked && pid != getpid())
158				exit(0);
159		}
160	}
161}
162
163static void reaper(int sig)
164{
165	int			status;
166	int			saved_errno;
167
168	saved_errno = errno;
169
170	if (sig == SIGHUP) {
171		load_securenets();
172		errno = saved_errno;
173		return;
174	}
175
176	if (sig == SIGCHLD) {
177		while (wait3(&status, WNOHANG, NULL) > 0)
178			children--;
179	} else {
180		(void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
181		exit(0);
182	}
183
184	errno = saved_errno;
185	return;
186}
187
188void
189usage(void)
190{
191	fprintf(stderr, "usage: rpc.ypxfrd [-p path]\n");
192	exit(0);
193}
194
195int
196main(int argc, char *argv[])
197{
198	register SVCXPRT *transp = NULL;
199	int sock;
200	int proto = 0;
201	struct sockaddr_in saddr;
202	int asize = sizeof (saddr);
203	int ch;
204
205	while ((ch = getopt(argc, argv, "p:h")) != -1) {
206		switch (ch) {
207		case 'p':
208			yp_dir = optarg;
209			break;
210		default:
211			usage();
212			break;
213		}
214	}
215
216	load_securenets();
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.ypxfrd", LOG_PID, LOG_DAEMON);
230	} else {
231#ifndef RPC_SVC_FG
232		int size;
233		int pid, i;
234
235		pid = fork();
236		if (pid < 0)
237			err(1, "fork");
238		if (pid)
239			exit(0);
240		size = getdtablesize();
241		for (i = 0; i < size; i++)
242			(void) close(i);
243		i = open(_PATH_CONSOLE, 2);
244		(void) dup2(i, 1);
245		(void) dup2(i, 2);
246		i = open(_PATH_TTY, 2);
247		if (i >= 0) {
248			(void) ioctl(i, TIOCNOTTY, (char *)NULL);
249			(void) close(i);
250		}
251		openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
252#endif
253		sock = RPC_ANYSOCK;
254		(void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
255	}
256
257	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
258		transp = svcudp_create(sock);
259		if (transp == NULL) {
260			_msgout("cannot create udp service.");
261			exit(1);
262		}
263		if (!_rpcpmstart)
264			proto = IPPROTO_UDP;
265		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
266			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp).");
267			exit(1);
268		}
269	}
270
271	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
272		transp = svctcp_create(sock, 0, 0);
273		if (transp == NULL) {
274			_msgout("cannot create tcp service.");
275			exit(1);
276		}
277		if (!_rpcpmstart)
278			proto = IPPROTO_TCP;
279		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
280			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp).");
281			exit(1);
282		}
283	}
284
285	if (transp == (SVCXPRT *)NULL) {
286		_msgout("could not create a handle");
287		exit(1);
288	}
289	if (_rpcpmstart) {
290		(void) signal(SIGALRM, (SIG_PF) closedown);
291		(void) alarm(_RPCSVC_CLOSEDOWN/2);
292	}
293
294	(void) signal(SIGPIPE, SIG_IGN);
295	(void) signal(SIGCHLD, (SIG_PF) reaper);
296	(void) signal(SIGTERM, (SIG_PF) reaper);
297	(void) signal(SIGINT, (SIG_PF) reaper);
298	(void) signal(SIGHUP, (SIG_PF) reaper);
299
300	ypxfrd_svc_run();
301	_msgout("svc_run returned");
302	exit(1);
303	/* NOTREACHED */
304}
305