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  * $FreeBSD: src/usr.sbin/rpc.ypupdated/ypupdated_main.c,v 1.10 2004/05/24 12:28:27 stefanf Exp $
33  * $DragonFly: src/usr.sbin/rpc.ypupdated/ypupdated_main.c,v 1.5 2005/11/25 00:32:49 swildner Exp $
34  */
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 <stdlib.h>
54 #include <unistd.h>
55 #include "ypupdated_extern.h"
56 #include "yp_extern.h"
57 
58 #ifndef SIG_PF
59 #define	SIG_PF void(*)(int)
60 #endif
61 
62 #ifdef DEBUG
63 #define	RPC_SVC_FG
64 #endif
65 
66 #define	_RPCSVC_CLOSEDOWN 120
67 int _rpcpmstart;		/* Started by a port monitor ? */
68 static int _rpcfdtype;
69 		 /* Whether Stream or Datagram ? */
70 	/* States a server can be in wrt request */
71 
72 #define	_IDLE 0
73 #define	_SERVED 1
74 #define	_SERVING 2
75 
76 extern int _rpcsvcstate;	 /* Set when a request is serviced */
77 
78 char *progname = "rpc.ypupdated";
79 char *yp_dir = "/var/yp/";
80 
81 static void
82 _msgout(char *msg)
83 {
84 #ifdef RPC_SVC_FG
85 	if (_rpcpmstart)
86 		syslog(LOG_ERR, "%s", msg);
87 	else
88 		warnx("%s", msg);
89 #else
90 	syslog(LOG_ERR, "%s", msg);
91 #endif
92 }
93 
94 static void
95 closedown(int sig)
96 {
97 	if (_rpcsvcstate == _IDLE) {
98 		extern fd_set svc_fdset;
99 		static int size;
100 		int i, openfd;
101 
102 		if (_rpcfdtype == SOCK_DGRAM)
103 			exit(0);
104 		if (size == 0) {
105 			size = getdtablesize();
106 		}
107 		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
108 			if (FD_ISSET(i, &svc_fdset))
109 				openfd++;
110 		if (openfd <= 1)
111 			exit(0);
112 	}
113 	if (_rpcsvcstate == _SERVED)
114 		_rpcsvcstate = _IDLE;
115 
116 	signal(SIGALRM, (SIG_PF) closedown);
117 	alarm(_RPCSVC_CLOSEDOWN/2);
118 }
119 
120 static void
121 ypupdated_svc_run(void)
122 {
123 #ifdef FD_SETSIZE
124 	fd_set readfds;
125 #else
126 	int readfds;
127 #endif /* def FD_SETSIZE */
128 	extern int forked;
129 	int pid;
130 	int fd_setsize = _rpc_dtablesize();
131 
132 	/* Establish the identity of the parent ypupdated process. */
133 	pid = getpid();
134 
135 	for (;;) {
136 #ifdef FD_SETSIZE
137 		readfds = svc_fdset;
138 #else
139 		readfds = svc_fds;
140 #endif /* def FD_SETSIZE */
141 		switch (select(fd_setsize, &readfds, NULL, NULL,
142 			       (struct timeval *)0)) {
143 		case -1:
144 			if (errno == EINTR) {
145 				continue;
146 			}
147 			warn("svc_run: - select failed");
148 			return;
149 		case 0:
150 			continue;
151 		default:
152 			svc_getreqset(&readfds);
153 			if (forked && pid != getpid())
154 				exit(0);
155 		}
156 	}
157 }
158 
159 static void
160 reaper(int sig)
161 {
162 	int status;
163 
164 	if (sig == SIGHUP) {
165 #ifdef foo
166 		load_securenets();
167 #endif
168 		return;
169 	}
170 
171 	if (sig == SIGCHLD) {
172 		while (wait3(&status, WNOHANG, NULL) > 0)
173 			children--;
174 	} else {
175 		pmap_unset(YPU_PROG, YPU_VERS);
176 		exit(0);
177 	}
178 }
179 
180 void
181 usage(void)
182 {
183 	fprintf(stderr, "rpc.ypupdatedd [-p path]\n");
184 	exit(0);
185 }
186 
187 int
188 main(int argc, char *argv[])
189 {
190 	SVCXPRT *transp = NULL;
191 	int sock;
192 	int proto = 0;
193 	struct sockaddr_in saddr;
194 	int asize = sizeof (saddr);
195 	int ch;
196 
197 	while ((ch = getopt(argc, argv, "p:h")) != -1) {
198 		switch (ch) {
199 		case 'p':
200 			yp_dir = optarg;
201 			break;
202 		default:
203 			usage();
204 			break;
205 		}
206 	}
207 #ifdef foo
208 	load_securenets();
209 #endif
210 
211 	if (svc_auth_reg(AUTH_DES, _svcauth_des) == -1) {
212 		yp_error("failed to register AUTH_DES flavor");
213 		exit(1);
214 	}
215 
216 	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
217 		int ssize = sizeof (int);
218 
219 		if (saddr.sin_family != AF_INET)
220 			exit(1);
221 		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
222 				(char *)&_rpcfdtype, &ssize) == -1)
223 			exit(1);
224 		sock = 0;
225 		_rpcpmstart = 1;
226 		proto = 0;
227 		openlog("rpc.ypupdatedd", LOG_PID, LOG_DAEMON);
228 	} else {
229 #ifndef RPC_SVC_FG
230 		if (daemon(0,0)) {
231 			err(1, "cannot fork");
232 		}
233 		openlog("rpc.ypupdated", LOG_PID, LOG_DAEMON);
234 #endif
235 		sock = RPC_ANYSOCK;
236 		pmap_unset(YPU_PROG, YPU_VERS);
237 	}
238 
239 	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
240 		transp = svcudp_create(sock);
241 		if (transp == NULL) {
242 			_msgout("cannot create udp service.");
243 			exit(1);
244 		}
245 		if (!_rpcpmstart)
246 			proto = IPPROTO_UDP;
247 		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
248 			_msgout("unable to register (YPU_PROG, YPU_VERS, udp).");
249 			exit(1);
250 		}
251 	}
252 
253 	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
254 		transp = svctcp_create(sock, 0, 0);
255 		if (transp == NULL) {
256 			_msgout("cannot create tcp service.");
257 			exit(1);
258 		}
259 		if (!_rpcpmstart)
260 			proto = IPPROTO_TCP;
261 		if (!svc_register(transp, YPU_PROG, YPU_VERS, ypu_prog_1, proto)) {
262 			_msgout("unable to register (YPU_PROG, YPU_VERS, tcp).");
263 			exit(1);
264 		}
265 	}
266 
267 	if (transp == (SVCXPRT *)NULL) {
268 		_msgout("could not create a handle");
269 		exit(1);
270 	}
271 	if (_rpcpmstart) {
272 		signal(SIGALRM, (SIG_PF) closedown);
273 		alarm(_RPCSVC_CLOSEDOWN/2);
274 	}
275 
276 	signal(SIGPIPE, SIG_IGN);
277 	signal(SIGCHLD, (SIG_PF) reaper);
278 	signal(SIGTERM, (SIG_PF) reaper);
279 	signal(SIGINT, (SIG_PF) reaper);
280 	signal(SIGHUP, (SIG_PF) reaper);
281 
282 	ypupdated_svc_run();
283 	_msgout("svc_run returned");
284 	exit(1);
285 	/* NOTREACHED */
286 }
287