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("$FreeBSD$");
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
81int debug;
82
83char *progname = "rpc.ypxfrd";
84char *yp_dir = "/var/yp/";
85
86static void
87_msgout(char *msg)
88{
89#ifdef RPC_SVC_FG
90	if (_rpcpmstart)
91		syslog(LOG_ERR, "%s", msg);
92	else
93		warnx("%s", msg);
94#else
95	syslog(LOG_ERR, "%s", msg);
96#endif
97}
98
99static void
100closedown(int sig)
101{
102	if (_rpcsvcstate == _IDLE) {
103		extern fd_set svc_fdset;
104		static int size;
105		int i, openfd;
106
107		if (_rpcfdtype == SOCK_DGRAM)
108			exit(0);
109		if (size == 0) {
110			size = getdtablesize();
111		}
112		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
113			if (FD_ISSET(i, &svc_fdset))
114				openfd++;
115		if (openfd <= 1)
116			exit(0);
117	}
118	if (_rpcsvcstate == _SERVED)
119		_rpcsvcstate = _IDLE;
120
121	(void) signal(SIGALRM, (SIG_PF) closedown);
122	(void) alarm(_RPCSVC_CLOSEDOWN/2);
123}
124
125
126static void
127ypxfrd_svc_run(void)
128{
129#ifdef FD_SETSIZE
130	fd_set readfds;
131#else
132	int readfds;
133#endif /* def FD_SETSIZE */
134	extern int forked;
135	int pid;
136	int fd_setsize = _rpc_dtablesize();
137
138	/* Establish the identity of the parent ypserv process. */
139	pid = getpid();
140
141	for (;;) {
142#ifdef FD_SETSIZE
143		readfds = svc_fdset;
144#else
145		readfds = svc_fds;
146#endif /* def FD_SETSIZE */
147		switch (select(fd_setsize, &readfds, NULL, NULL,
148			       (struct timeval *)0)) {
149		case -1:
150			if (errno == EINTR) {
151				continue;
152			}
153			warn("svc_run: - select failed");
154			return;
155		case 0:
156			continue;
157		default:
158			svc_getreqset(&readfds);
159			if (forked && pid != getpid())
160				exit(0);
161		}
162	}
163}
164
165static void reaper(int sig)
166{
167	int			status;
168	int			saved_errno;
169
170	saved_errno = errno;
171
172	if (sig == SIGHUP) {
173		load_securenets();
174		errno = saved_errno;
175		return;
176	}
177
178	if (sig == SIGCHLD) {
179		while (wait3(&status, WNOHANG, NULL) > 0)
180			children--;
181	} else {
182		(void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
183		exit(0);
184	}
185
186	errno = saved_errno;
187	return;
188}
189
190void
191usage(void)
192{
193	fprintf(stderr, "usage: rpc.ypxfrd [-p path]\n");
194	exit(0);
195}
196
197int
198main(int argc, char *argv[])
199{
200	register SVCXPRT *transp = NULL;
201	int sock;
202	int proto = 0;
203	struct sockaddr_in saddr;
204	int asize = sizeof (saddr);
205	int ch;
206
207	while ((ch = getopt(argc, argv, "p:h")) != -1) {
208		switch (ch) {
209		case 'p':
210			yp_dir = optarg;
211			break;
212		default:
213			usage();
214			break;
215		}
216	}
217
218	load_securenets();
219
220	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
221		int ssize = sizeof (int);
222
223		if (saddr.sin_family != AF_INET)
224			exit(1);
225		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
226				(char *)&_rpcfdtype, &ssize) == -1)
227			exit(1);
228		sock = 0;
229		_rpcpmstart = 1;
230		proto = 0;
231		openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
232	} else {
233#ifndef RPC_SVC_FG
234		int size;
235		int pid, i;
236
237		pid = fork();
238		if (pid < 0)
239			err(1, "fork");
240		if (pid)
241			exit(0);
242		size = getdtablesize();
243		for (i = 0; i < size; i++)
244			(void) close(i);
245		i = open(_PATH_CONSOLE, 2);
246		(void) dup2(i, 1);
247		(void) dup2(i, 2);
248		i = open(_PATH_TTY, 2);
249		if (i >= 0) {
250			(void) ioctl(i, TIOCNOTTY, (char *)NULL);
251			(void) close(i);
252		}
253		openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
254#endif
255		sock = RPC_ANYSOCK;
256		(void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
257	}
258
259	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
260		transp = svcudp_create(sock);
261		if (transp == NULL) {
262			_msgout("cannot create udp service.");
263			exit(1);
264		}
265		if (!_rpcpmstart)
266			proto = IPPROTO_UDP;
267		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
268			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp).");
269			exit(1);
270		}
271	}
272
273	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
274		transp = svctcp_create(sock, 0, 0);
275		if (transp == NULL) {
276			_msgout("cannot create tcp service.");
277			exit(1);
278		}
279		if (!_rpcpmstart)
280			proto = IPPROTO_TCP;
281		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
282			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp).");
283			exit(1);
284		}
285	}
286
287	if (transp == (SVCXPRT *)NULL) {
288		_msgout("could not create a handle");
289		exit(1);
290	}
291	if (_rpcpmstart) {
292		(void) signal(SIGALRM, (SIG_PF) closedown);
293		(void) alarm(_RPCSVC_CLOSEDOWN/2);
294	}
295
296	(void) signal(SIGPIPE, SIG_IGN);
297	(void) signal(SIGCHLD, (SIG_PF) reaper);
298	(void) signal(SIGTERM, (SIG_PF) reaper);
299	(void) signal(SIGINT, (SIG_PF) reaper);
300	(void) signal(SIGHUP, (SIG_PF) reaper);
301
302	ypxfrd_svc_run();
303	_msgout("svc_run returned");
304	exit(1);
305	/* NOTREACHED */
306}
307