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
66 int _rpcpmstart;		/* Started by a port monitor ? */
67 static 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 
75 extern int _rpcsvcstate;	 /* Set when a request is serviced */
76 
77 char *progname = "rpc.ypupdated";
78 char *yp_dir = "/var/yp/";
79 
80 static 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 
93 static void
94 closedown(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 
119 static void
120 ypupdated_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 
158 static void
159 reaper(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 
179 void
180 usage(void)
181 {
182 	fprintf(stderr, "rpc.ypupdatedd [-p path]\n");
183 	exit(0);
184 }
185 
186 int
187 main(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