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 "ypupdate_prot.h"
39#include <stdio.h>
40#include <stdlib.h> /* getenv, exit */
41#include <rpc/pmap_clnt.h> /* for pmap_unset */
42#include <rpc/rpc_com.h>
43#include <string.h> /* strcmp */
44#include <signal.h>
45#ifdef __cplusplus
46#include <sysent.h> /* getdtablesize, open */
47#endif /* __cplusplus */
48#include <memory.h>
49#include <sys/socket.h>
50#include <netinet/in.h>
51#include <syslog.h>
52#include <sys/wait.h>
53#include <errno.h>
54#include <err.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
79int debug;
80
81char *progname = "rpc.ypupdated";
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
123static void
124ypupdated_svc_run(void)
125{
126#ifdef FD_SETSIZE
127	fd_set readfds;
128#else
129	int readfds;
130#endif /* def FD_SETSIZE */
131	extern int forked;
132	int pid;
133	int fd_setsize = _rpc_dtablesize();
134
135	/* Establish the identity of the parent ypupdated process. */
136	pid = getpid();
137
138	for (;;) {
139#ifdef FD_SETSIZE
140		readfds = svc_fdset;
141#else
142		readfds = svc_fds;
143#endif /* def FD_SETSIZE */
144		switch (select(fd_setsize, &readfds, NULL, NULL,
145			       (struct timeval *)0)) {
146		case -1:
147			if (errno == EINTR) {
148				continue;
149			}
150			warn("svc_run: - select failed");
151			return;
152		case 0:
153			continue;
154		default:
155			svc_getreqset(&readfds);
156			if (forked && pid != getpid())
157				exit(0);
158		}
159	}
160}
161
162static void
163reaper(int sig)
164{
165	int status;
166
167	if (sig == SIGHUP) {
168#ifdef foo
169		load_securenets();
170#endif
171		return;
172	}
173
174	if (sig == SIGCHLD) {
175		while (wait3(&status, WNOHANG, NULL) > 0)
176			children--;
177	} else {
178		(void) pmap_unset(YPU_PROG, YPU_VERS);
179		exit(0);
180	}
181}
182
183void
184usage(void)
185{
186	fprintf(stderr, "rpc.ypupdatedd [-p path]\n");
187	exit(0);
188}
189
190int
191main(int argc, char *argv[])
192{
193	register SVCXPRT *transp = NULL;
194	int sock;
195	int proto = 0;
196	struct sockaddr_in saddr;
197	int asize = sizeof (saddr);
198	int ch;
199
200	while ((ch = getopt(argc, argv, "p:h")) != -1) {
201		switch (ch) {
202		case 'p':
203			yp_dir = optarg;
204			break;
205		default:
206			usage();
207			break;
208		}
209	}
210#ifdef foo
211	load_securenets();
212#endif
213
214	if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) {
215		yp_error("failed to register AUTH_DES flavor");
216		exit(1);
217	}
218
219	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
220		int ssize = sizeof (int);
221
222		if (saddr.sin_family != AF_INET)
223			exit(1);
224		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
225				(char *)&_rpcfdtype, &ssize) == -1)
226			exit(1);
227		sock = 0;
228		_rpcpmstart = 1;
229		proto = 0;
230		openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON);
231	} else {
232#ifndef RPC_SVC_FG
233		if (daemon(0,0)) {
234			err(1, "cannot fork");
235		}
236		openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON);
237#endif
238		sock = RPC_ANYSOCK;
239		(void) pmap_unset(YPU_PROG, YPU_VERS);
240	}
241
242	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
243		transp = svcudp_create(sock);
244		if (transp == NULL) {
245			_msgout("cannot create udp service.");
246			exit(1);
247		}
248		if (!_rpcpmstart)
249			proto = IPPROTO_UDP;
250		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
251			_msgout("unable to register (YPU_PROG, YPU_VERS, udp).");
252			exit(1);
253		}
254	}
255
256	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
257		transp = svctcp_create(sock, 0, 0);
258		if (transp == NULL) {
259			_msgout("cannot create tcp service.");
260			exit(1);
261		}
262		if (!_rpcpmstart)
263			proto = IPPROTO_TCP;
264		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
265			_msgout("unable to register (YPU_PROG, YPU_VERS, tcp).");
266			exit(1);
267		}
268	}
269
270	if (transp == (SVCXPRT *)NULL) {
271		_msgout("could not create a handle");
272		exit(1);
273	}
274	if (_rpcpmstart) {
275		(void) signal(SIGALRM, (SIG_PF) closedown);
276		(void) alarm(_RPCSVC_CLOSEDOWN/2);
277	}
278
279	(void) signal(SIGPIPE, SIG_IGN);
280	(void) signal(SIGCHLD, (SIG_PF) reaper);
281	(void) signal(SIGTERM, (SIG_PF) reaper);
282	(void) signal(SIGINT, (SIG_PF) reaper);
283	(void) signal(SIGHUP, (SIG_PF) reaper);
284
285	ypupdated_svc_run();
286	_msgout("svc_run returned");
287	exit(1);
288	/* NOTREACHED */
289}
290