1/*
2 * Copyright (c) 1995, 1996
3 *	Bill Paul <wpaul@ctr.columbia.edu>.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by Bill Paul.
16 * 4. Neither the name of the author nor the names of any co-contributors
17 *    may be used to endorse or promote products derived from this software
18 *    without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY Bill Paul AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED.  IN NO EVENT SHALL Bill Paul OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33#include <sys/cdefs.h>
34__FBSDID("$FreeBSD$");
35
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
77char *progname = "rpc.ypupdated";
78char *yp_dir = "/var/yp/";
79
80static void
81_msgout(char* msg)
82{
83#ifdef RPC_SVC_FG
84	if (_rpcpmstart)
85		syslog(LOG_ERR, "%s", msg);
86	else
87		warnx("%s", msg);
88#else
89	syslog(LOG_ERR, "%s", msg);
90#endif
91}
92
93static void
94closedown(int sig)
95{
96	if (_rpcsvcstate == _IDLE) {
97		extern fd_set svc_fdset;
98		static int size;
99		int i, openfd;
100
101		if (_rpcfdtype == SOCK_DGRAM)
102			exit(0);
103		if (size == 0) {
104			size = getdtablesize();
105		}
106		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
107			if (FD_ISSET(i, &svc_fdset))
108				openfd++;
109		if (openfd <= 1)
110			exit(0);
111	}
112	if (_rpcsvcstate == _SERVED)
113		_rpcsvcstate = _IDLE;
114
115	(void) signal(SIGALRM, (SIG_PF) closedown);
116	(void) alarm(_RPCSVC_CLOSEDOWN/2);
117}
118
119static void
120ypupdated_svc_run(void)
121{
122#ifdef FD_SETSIZE
123	fd_set readfds;
124#else
125	int readfds;
126#endif /* def FD_SETSIZE */
127	extern int forked;
128	int pid;
129	int fd_setsize = _rpc_dtablesize();
130
131	/* Establish the identity of the parent ypupdated process. */
132	pid = getpid();
133
134	for (;;) {
135#ifdef FD_SETSIZE
136		readfds = svc_fdset;
137#else
138		readfds = svc_fds;
139#endif /* def FD_SETSIZE */
140		switch (select(fd_setsize, &readfds, NULL, NULL,
141			       (struct timeval *)0)) {
142		case -1:
143			if (errno == EINTR) {
144				continue;
145			}
146			warn("svc_run: - select failed");
147			return;
148		case 0:
149			continue;
150		default:
151			svc_getreqset(&readfds);
152			if (forked && pid != getpid())
153				exit(0);
154		}
155	}
156}
157
158static void
159reaper(int sig)
160{
161	int status;
162
163	if (sig == SIGHUP) {
164#ifdef foo
165		load_securenets();
166#endif
167		return;
168	}
169
170	if (sig == SIGCHLD) {
171		while (wait3(&status, WNOHANG, NULL) > 0)
172			children--;
173	} else {
174		(void) pmap_unset(YPU_PROG, YPU_VERS);
175		exit(0);
176	}
177}
178
179void
180usage(void)
181{
182	fprintf(stderr, "rpc.ypupdatedd [-p path]\n");
183	exit(0);
184}
185
186int
187main(int argc, char *argv[])
188{
189	register SVCXPRT *transp = NULL;
190	int sock;
191	int proto = 0;
192	struct sockaddr_in saddr;
193	int asize = sizeof (saddr);
194	int ch;
195
196	while ((ch = getopt(argc, argv, "p:h")) != -1) {
197		switch (ch) {
198		case 'p':
199			yp_dir = optarg;
200			break;
201		default:
202			usage();
203			break;
204		}
205	}
206#ifdef foo
207	load_securenets();
208#endif
209
210	if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) {
211		yp_error("failed to register AUTH_DES flavor");
212		exit(1);
213	}
214
215	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
216		int ssize = sizeof (int);
217
218		if (saddr.sin_family != AF_INET)
219			exit(1);
220		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
221				(char *)&_rpcfdtype, &ssize) == -1)
222			exit(1);
223		sock = 0;
224		_rpcpmstart = 1;
225		proto = 0;
226		openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON);
227	} else {
228#ifndef RPC_SVC_FG
229		if (daemon(0,0)) {
230			err(1, "cannot fork");
231		}
232		openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON);
233#endif
234		sock = RPC_ANYSOCK;
235		(void) pmap_unset(YPU_PROG, YPU_VERS);
236	}
237
238	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
239		transp = svcudp_create(sock);
240		if (transp == NULL) {
241			_msgout("cannot create udp service.");
242			exit(1);
243		}
244		if (!_rpcpmstart)
245			proto = IPPROTO_UDP;
246		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
247			_msgout("unable to register (YPU_PROG, YPU_VERS, udp).");
248			exit(1);
249		}
250	}
251
252	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
253		transp = svctcp_create(sock, 0, 0);
254		if (transp == NULL) {
255			_msgout("cannot create tcp service.");
256			exit(1);
257		}
258		if (!_rpcpmstart)
259			proto = IPPROTO_TCP;
260		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
261			_msgout("unable to register (YPU_PROG, YPU_VERS, tcp).");
262			exit(1);
263		}
264	}
265
266	if (transp == (SVCXPRT *)NULL) {
267		_msgout("could not create a handle");
268		exit(1);
269	}
270	if (_rpcpmstart) {
271		(void) signal(SIGALRM, (SIG_PF) closedown);
272		(void) alarm(_RPCSVC_CLOSEDOWN/2);
273	}
274
275	(void) signal(SIGPIPE, SIG_IGN);
276	(void) signal(SIGCHLD, (SIG_PF) reaper);
277	(void) signal(SIGTERM, (SIG_PF) reaper);
278	(void) signal(SIGINT, (SIG_PF) reaper);
279	(void) signal(SIGHUP, (SIG_PF) reaper);
280
281	ypupdated_svc_run();
282	_msgout("svc_run returned");
283	exit(1);
284	/* NOTREACHED */
285}
286