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 "ypupdate_prot.h"
37#include <stdio.h>
38#include <stdlib.h> /* getenv, exit */
39#include <rpc/pmap_clnt.h> /* for pmap_unset */
40#include <rpc/rpc_com.h>
41#include <string.h> /* strcmp */
42#include <signal.h>
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 <sys/wait.h>
51#include <errno.h>
52#include <err.h>
53#include <unistd.h>
54#include "ypupdated_extern.h"
55#include "yp_extern.h"
56
57#ifndef SIG_PF
58#define	SIG_PF void(*)(int)
59#endif
60
61#ifdef DEBUG
62#define	RPC_SVC_FG
63#endif
64
65#define	_RPCSVC_CLOSEDOWN 120
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
77int debug;
78
79char *progname = "rpc.ypupdated";
80char *yp_dir = "/var/yp/";
81
82static void
83_msgout(char* msg)
84{
85#ifdef RPC_SVC_FG
86	if (_rpcpmstart)
87		syslog(LOG_ERR, "%s", msg);
88	else
89		warnx("%s", msg);
90#else
91	syslog(LOG_ERR, "%s", msg);
92#endif
93}
94
95static void
96closedown(int sig)
97{
98	if (_rpcsvcstate == _IDLE) {
99		extern fd_set svc_fdset;
100		static int size;
101		int i, openfd;
102
103		if (_rpcfdtype == SOCK_DGRAM)
104			exit(0);
105		if (size == 0) {
106			size = getdtablesize();
107		}
108		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
109			if (FD_ISSET(i, &svc_fdset))
110				openfd++;
111		if (openfd <= 1)
112			exit(0);
113	}
114	if (_rpcsvcstate == _SERVED)
115		_rpcsvcstate = _IDLE;
116
117	(void) signal(SIGALRM, (SIG_PF) closedown);
118	(void) alarm(_RPCSVC_CLOSEDOWN/2);
119}
120
121static void
122ypupdated_svc_run(void)
123{
124#ifdef FD_SETSIZE
125	fd_set readfds;
126#else
127	int readfds;
128#endif /* def FD_SETSIZE */
129	extern int forked;
130	int pid;
131	int fd_setsize = _rpc_dtablesize();
132
133	/* Establish the identity of the parent ypupdated process. */
134	pid = getpid();
135
136	for (;;) {
137#ifdef FD_SETSIZE
138		readfds = svc_fdset;
139#else
140		readfds = svc_fds;
141#endif /* def FD_SETSIZE */
142		switch (select(fd_setsize, &readfds, NULL, NULL,
143			       (struct timeval *)0)) {
144		case -1:
145			if (errno == EINTR) {
146				continue;
147			}
148			warn("svc_run: - select failed");
149			return;
150		case 0:
151			continue;
152		default:
153			svc_getreqset(&readfds);
154			if (forked && pid != getpid())
155				exit(0);
156		}
157	}
158}
159
160static void
161reaper(int sig)
162{
163	int status;
164
165	if (sig == SIGHUP) {
166#ifdef foo
167		load_securenets();
168#endif
169		return;
170	}
171
172	if (sig == SIGCHLD) {
173		while (wait3(&status, WNOHANG, NULL) > 0)
174			children--;
175	} else {
176		(void) pmap_unset(YPU_PROG, YPU_VERS);
177		exit(0);
178	}
179}
180
181void
182usage(void)
183{
184	fprintf(stderr, "rpc.ypupdatedd [-p path]\n");
185	exit(0);
186}
187
188int
189main(int argc, char *argv[])
190{
191	register SVCXPRT *transp = NULL;
192	int sock;
193	int proto = 0;
194	struct sockaddr_in saddr;
195	int asize = sizeof (saddr);
196	int ch;
197
198	while ((ch = getopt(argc, argv, "p:h")) != -1) {
199		switch (ch) {
200		case 'p':
201			yp_dir = optarg;
202			break;
203		default:
204			usage();
205			break;
206		}
207	}
208#ifdef foo
209	load_securenets();
210#endif
211
212	if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) {
213		yp_error("failed to register AUTH_DES flavor");
214		exit(1);
215	}
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.ypupdatedd", LOG_PID, LOG_DAEMON);
229	} else {
230#ifndef RPC_SVC_FG
231		if (daemon(0,0)) {
232			err(1, "cannot fork");
233		}
234		openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON);
235#endif
236		sock = RPC_ANYSOCK;
237		(void) pmap_unset(YPU_PROG, YPU_VERS);
238	}
239
240	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
241		transp = svcudp_create(sock);
242		if (transp == NULL) {
243			_msgout("cannot create udp service.");
244			exit(1);
245		}
246		if (!_rpcpmstart)
247			proto = IPPROTO_UDP;
248		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
249			_msgout("unable to register (YPU_PROG, YPU_VERS, udp).");
250			exit(1);
251		}
252	}
253
254	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
255		transp = svctcp_create(sock, 0, 0);
256		if (transp == NULL) {
257			_msgout("cannot create tcp service.");
258			exit(1);
259		}
260		if (!_rpcpmstart)
261			proto = IPPROTO_TCP;
262		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
263			_msgout("unable to register (YPU_PROG, YPU_VERS, tcp).");
264			exit(1);
265		}
266	}
267
268	if (transp == (SVCXPRT *)NULL) {
269		_msgout("could not create a handle");
270		exit(1);
271	}
272	if (_rpcpmstart) {
273		(void) signal(SIGALRM, (SIG_PF) closedown);
274		(void) alarm(_RPCSVC_CLOSEDOWN/2);
275	}
276
277	(void) signal(SIGPIPE, SIG_IGN);
278	(void) signal(SIGCHLD, (SIG_PF) reaper);
279	(void) signal(SIGTERM, (SIG_PF) reaper);
280	(void) signal(SIGINT, (SIG_PF) reaper);
281	(void) signal(SIGHUP, (SIG_PF) reaper);
282
283	ypupdated_svc_run();
284	_msgout("svc_run returned");
285	exit(1);
286	/* NOTREACHED */
287}
288