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#include "ypxfrd.h"
37#include <err.h>
38#include <fcntl.h>
39#include <paths.h>
40#include <stdio.h>
41#include <stdlib.h> /* getenv, exit */
42#include <unistd.h>
43#include <rpc/pmap_clnt.h> /* for pmap_unset */
44#include <rpc/rpc_com.h>
45#include <string.h> /* strcmp */
46#include <signal.h>
47#include <sys/ttycom.h> /* TIOCNOTTY */
48#ifdef __cplusplus
49#include <sysent.h> /* getdtablesize, open */
50#endif /* __cplusplus */
51#include <memory.h>
52#include <sys/socket.h>
53#include <netinet/in.h>
54#include <syslog.h>
55#include "ypxfrd_extern.h"
56#include <sys/wait.h>
57#include <errno.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
79int debug;
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}
186
187void
188usage(void)
189{
190	fprintf(stderr, "usage: rpc.ypxfrd [-p path]\n");
191	exit(0);
192}
193
194int
195main(int argc, char *argv[])
196{
197	register SVCXPRT *transp = NULL;
198	int sock;
199	int proto = 0;
200	struct sockaddr_in saddr;
201	int asize = sizeof (saddr);
202	int ch;
203
204	while ((ch = getopt(argc, argv, "p:h")) != -1) {
205		switch (ch) {
206		case 'p':
207			yp_dir = optarg;
208			break;
209		default:
210			usage();
211			break;
212		}
213	}
214
215	load_securenets();
216
217	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
218		int ssize = sizeof (int);
219
220		if (saddr.sin_family != AF_INET)
221			exit(1);
222		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
223				(char *)&_rpcfdtype, &ssize) == -1)
224			exit(1);
225		sock = 0;
226		_rpcpmstart = 1;
227		proto = 0;
228		openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
229	} else {
230#ifndef RPC_SVC_FG
231		int size;
232		int pid, i;
233
234		pid = fork();
235		if (pid < 0)
236			err(1, "fork");
237		if (pid)
238			exit(0);
239		size = getdtablesize();
240		for (i = 0; i < size; i++)
241			(void) close(i);
242		i = open(_PATH_CONSOLE, 2);
243		(void) dup2(i, 1);
244		(void) dup2(i, 2);
245		i = open(_PATH_TTY, 2);
246		if (i >= 0) {
247			(void) ioctl(i, TIOCNOTTY, (char *)NULL);
248			(void) close(i);
249		}
250		openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
251#endif
252		sock = RPC_ANYSOCK;
253		(void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
254	}
255
256	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
257		transp = svcudp_create(sock);
258		if (transp == NULL) {
259			_msgout("cannot create udp service.");
260			exit(1);
261		}
262		if (!_rpcpmstart)
263			proto = IPPROTO_UDP;
264		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
265			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp).");
266			exit(1);
267		}
268	}
269
270	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
271		transp = svctcp_create(sock, 0, 0);
272		if (transp == NULL) {
273			_msgout("cannot create tcp service.");
274			exit(1);
275		}
276		if (!_rpcpmstart)
277			proto = IPPROTO_TCP;
278		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
279			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp).");
280			exit(1);
281		}
282	}
283
284	if (transp == (SVCXPRT *)NULL) {
285		_msgout("could not create a handle");
286		exit(1);
287	}
288	if (_rpcpmstart) {
289		(void) signal(SIGALRM, (SIG_PF) closedown);
290		(void) alarm(_RPCSVC_CLOSEDOWN/2);
291	}
292
293	(void) signal(SIGPIPE, SIG_IGN);
294	(void) signal(SIGCHLD, (SIG_PF) reaper);
295	(void) signal(SIGTERM, (SIG_PF) reaper);
296	(void) signal(SIGINT, (SIG_PF) reaper);
297	(void) signal(SIGHUP, (SIG_PF) reaper);
298
299	ypxfrd_svc_run();
300	_msgout("svc_run returned");
301	exit(1);
302	/* NOTREACHED */
303}
304