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 #ifndef lint
34 static const char rcsid[] =
35   "$FreeBSD: src/usr.sbin/rpc.ypupdated/ypupdated_main.c,v 1.4.2.3 2002/02/15 00:46:58 des Exp $";
36 #endif /* not lint */
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 <string.h> /* strcmp */
43 #include <signal.h>
44 #ifdef __cplusplus
45 #include <sysent.h> /* getdtablesize, open */
46 #endif /* __cplusplus */
47 #include <memory.h>
48 #include <sys/socket.h>
49 #include <netinet/in.h>
50 #include <syslog.h>
51 #include <sys/wait.h>
52 #include <errno.h>
53 #include <err.h>
54 #include <stdlib.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
68 int _rpcpmstart;		/* Started by a port monitor ? */
69 static 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 
77 extern int _rpcsvcstate;	 /* Set when a request is serviced */
78 
79 char *progname = "rpc.ypupdated";
80 char *yp_dir = "/var/yp/";
81 
82 static
83 void _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 
95 static void
96 closedown(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 
121 static void
122 ypupdated_svc_run()
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 
160 static void reaper(sig)
161 	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 
181 void usage()
182 {
183 	fprintf(stderr, "rpc.ypupdatedd [-p path]\n");
184 	exit(0);
185 }
186 
187 int
188 main(argc, argv)
189 	int argc;
190 	char *argv[];
191 {
192 	register SVCXPRT *transp = NULL;
193 	int sock;
194 	int proto = 0;
195 	struct sockaddr_in saddr;
196 	int asize = sizeof (saddr);
197 	int ch;
198 
199 	while ((ch = getopt(argc, argv, "p:h")) != -1) {
200 		switch (ch) {
201 		case 'p':
202 			yp_dir = optarg;
203 			break;
204 		default:
205 			usage();
206 			break;
207 		}
208 	}
209 #ifdef foo
210 	load_securenets();
211 #endif
212 
213 	if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) {
214 		yp_error("failed to register AUTH_DES flavor");
215 		exit(1);
216 	}
217 
218 	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
219 		int ssize = sizeof (int);
220 
221 		if (saddr.sin_family != AF_INET)
222 			exit(1);
223 		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
224 				(char *)&_rpcfdtype, &ssize) == -1)
225 			exit(1);
226 		sock = 0;
227 		_rpcpmstart = 1;
228 		proto = 0;
229 		openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON);
230 	} else {
231 #ifndef RPC_SVC_FG
232 		if (daemon(0,0)) {
233 			err(1, "cannot fork");
234 		}
235 		openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON);
236 #endif
237 		sock = RPC_ANYSOCK;
238 		(void) pmap_unset(YPU_PROG, YPU_VERS);
239 	}
240 
241 	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
242 		transp = svcudp_create(sock);
243 		if (transp == NULL) {
244 			_msgout("cannot create udp service.");
245 			exit(1);
246 		}
247 		if (!_rpcpmstart)
248 			proto = IPPROTO_UDP;
249 		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
250 			_msgout("unable to register (YPU_PROG, YPU_VERS, udp).");
251 			exit(1);
252 		}
253 	}
254 
255 	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
256 		transp = svctcp_create(sock, 0, 0);
257 		if (transp == NULL) {
258 			_msgout("cannot create tcp service.");
259 			exit(1);
260 		}
261 		if (!_rpcpmstart)
262 			proto = IPPROTO_TCP;
263 		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
264 			_msgout("unable to register (YPU_PROG, YPU_VERS, tcp).");
265 			exit(1);
266 		}
267 	}
268 
269 	if (transp == (SVCXPRT *)NULL) {
270 		_msgout("could not create a handle");
271 		exit(1);
272 	}
273 	if (_rpcpmstart) {
274 		(void) signal(SIGALRM, (SIG_PF) closedown);
275 		(void) alarm(_RPCSVC_CLOSEDOWN/2);
276 	}
277 
278 	(void) signal(SIGPIPE, SIG_IGN);
279 	(void) signal(SIGCHLD, (SIG_PF) reaper);
280 	(void) signal(SIGTERM, (SIG_PF) reaper);
281 	(void) signal(SIGINT, (SIG_PF) reaper);
282 	(void) signal(SIGHUP, (SIG_PF) reaper);
283 
284 	ypupdated_svc_run();
285 	_msgout("svc_run returned");
286 	exit(1);
287 	/* NOTREACHED */
288 }
289