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.ypxfrd/ypxfrd_main.c,v 1.8.2.3 2002/02/15 00:46:58 des Exp $
33  * $DragonFly: src/usr.sbin/rpc.ypxfrd/ypxfrd_main.c,v 1.5 2005/11/25 00:32:49 swildner Exp $
34  */
35 
36 #include "ypxfrd.h"
37 #include <err.h>
38 #include <fcntl.h>
39 #include <paths.h>
40 #include <stdio.h>
41 #include <stdlib.h> /* getenv, exit */
42 #include <unistd.h>
43 #include <rpc/pmap_clnt.h> /* for pmap_unset */
44 #include <string.h> /* strcmp */
45 #include <signal.h>
46 #include <sys/ttycom.h> /* TIOCNOTTY */
47 #ifdef __cplusplus
48 #include <sysent.h> /* getdtablesize, open */
49 #endif /* __cplusplus */
50 #include <memory.h>
51 #include <sys/socket.h>
52 #include <netinet/in.h>
53 #include <syslog.h>
54 #include "ypxfrd_extern.h"
55 #include <sys/wait.h>
56 #include <errno.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.ypxfrd";
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 
121 static void
122 ypxfrd_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 ypserv 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
161 reaper(int sig)
162 {
163 	int			status;
164 	int			saved_errno;
165 
166 	saved_errno = errno;
167 
168 	if (sig == SIGHUP) {
169 		load_securenets();
170 		errno = saved_errno;
171 		return;
172 	}
173 
174 	if (sig == SIGCHLD) {
175 		while (wait3(&status, WNOHANG, NULL) > 0)
176 			children--;
177 	} else {
178 		pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
179 		exit(0);
180 	}
181 
182 	errno = saved_errno;
183 	return;
184 }
185 
186 void
187 usage(void)
188 {
189 	fprintf(stderr, "usage: rpc.ypxfrd [-p path]\n");
190 	exit(0);
191 }
192 
193 int
194 main(int argc, char *argv[])
195 {
196 	SVCXPRT *transp = NULL;
197 	int sock;
198 	int proto = 0;
199 	struct sockaddr_in saddr;
200 	int asize = sizeof (saddr);
201 	int ch;
202 
203 	while ((ch = getopt(argc, argv, "p:h")) != -1) {
204 		switch (ch) {
205 		case 'p':
206 			yp_dir = optarg;
207 			break;
208 		default:
209 			usage();
210 			break;
211 		}
212 	}
213 
214 	load_securenets();
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.ypxfrd", LOG_PID, LOG_DAEMON);
228 	} else {
229 #ifndef RPC_SVC_FG
230 		int size;
231 		int pid, i;
232 
233 		pid = fork();
234 		if (pid < 0)
235 			err(1, "fork");
236 		if (pid)
237 			exit(0);
238 		size = getdtablesize();
239 		for (i = 0; i < size; i++)
240 			close(i);
241 		i = open(_PATH_CONSOLE, 2);
242 		dup2(i, 1);
243 		dup2(i, 2);
244 		i = open(_PATH_TTY, 2);
245 		if (i >= 0) {
246 			ioctl(i, TIOCNOTTY, (char *)NULL);
247 			close(i);
248 		}
249 		openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
250 #endif
251 		sock = RPC_ANYSOCK;
252 		pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
253 	}
254 
255 	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
256 		transp = svcudp_create(sock);
257 		if (transp == NULL) {
258 			_msgout("cannot create udp service.");
259 			exit(1);
260 		}
261 		if (!_rpcpmstart)
262 			proto = IPPROTO_UDP;
263 		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
264 			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp).");
265 			exit(1);
266 		}
267 	}
268 
269 	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
270 		transp = svctcp_create(sock, 0, 0);
271 		if (transp == NULL) {
272 			_msgout("cannot create tcp service.");
273 			exit(1);
274 		}
275 		if (!_rpcpmstart)
276 			proto = IPPROTO_TCP;
277 		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
278 			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp).");
279 			exit(1);
280 		}
281 	}
282 
283 	if (transp == (SVCXPRT *)NULL) {
284 		_msgout("could not create a handle");
285 		exit(1);
286 	}
287 	if (_rpcpmstart) {
288 		signal(SIGALRM, (SIG_PF) closedown);
289 		alarm(_RPCSVC_CLOSEDOWN/2);
290 	}
291 
292 	signal(SIGPIPE, SIG_IGN);
293 	signal(SIGCHLD, (SIG_PF) reaper);
294 	signal(SIGTERM, (SIG_PF) reaper);
295 	signal(SIGINT, (SIG_PF) reaper);
296 	signal(SIGHUP, (SIG_PF) reaper);
297 
298 	ypxfrd_svc_run();
299 	_msgout("svc_run returned");
300 	exit(1);
301 	/* NOTREACHED */
302 }
303