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  */
34 
35 #include "ypxfrd.h"
36 #include <err.h>
37 #include <fcntl.h>
38 #include <paths.h>
39 #include <stdio.h>
40 #include <stdlib.h> /* getenv, exit */
41 #include <unistd.h>
42 #include <rpc/pmap_clnt.h> /* for pmap_unset */
43 #include <rpc/rpc_com.h>
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 int debug;
79 
80 char *progname = "rpc.ypxfrd";
81 char *yp_dir = "/var/yp/";
82 
83 static void
84 _msgout(char *msg)
85 {
86 #ifdef RPC_SVC_FG
87 	if (_rpcpmstart)
88 		syslog(LOG_ERR, "%s", msg);
89 	else
90 		warnx("%s", msg);
91 #else
92 	syslog(LOG_ERR, "%s", msg);
93 #endif
94 }
95 
96 static void
97 closedown(int sig)
98 {
99 	if (_rpcsvcstate == _IDLE) {
100 		extern fd_set svc_fdset;
101 		static int size;
102 		int i, openfd;
103 
104 		if (_rpcfdtype == SOCK_DGRAM)
105 			exit(0);
106 		if (size == 0) {
107 			size = getdtablesize();
108 		}
109 		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
110 			if (FD_ISSET(i, &svc_fdset))
111 				openfd++;
112 		if (openfd <= 1)
113 			exit(0);
114 	}
115 	if (_rpcsvcstate == _SERVED)
116 		_rpcsvcstate = _IDLE;
117 
118 	signal(SIGALRM, (SIG_PF) closedown);
119 	alarm(_RPCSVC_CLOSEDOWN/2);
120 }
121 
122 
123 static void
124 ypxfrd_svc_run(void)
125 {
126 #ifdef FD_SETSIZE
127 	fd_set readfds;
128 #else
129 	int readfds;
130 #endif /* def FD_SETSIZE */
131 	extern int forked;
132 	int pid;
133 	int fd_setsize = _rpc_dtablesize();
134 
135 	/* Establish the identity of the parent ypserv process. */
136 	pid = getpid();
137 
138 	for (;;) {
139 #ifdef FD_SETSIZE
140 		readfds = svc_fdset;
141 #else
142 		readfds = svc_fds;
143 #endif /* def FD_SETSIZE */
144 		switch (select(fd_setsize, &readfds, NULL, NULL, NULL)) {
145 		case -1:
146 			if (errno == EINTR) {
147 				continue;
148 			}
149 			warn("svc_run: - select failed");
150 			return;
151 		case 0:
152 			continue;
153 		default:
154 			svc_getreqset(&readfds);
155 			if (forked && pid != getpid())
156 				exit(0);
157 		}
158 	}
159 }
160 
161 static void
162 reaper(int sig)
163 {
164 	int			status;
165 	int			saved_errno;
166 
167 	saved_errno = errno;
168 
169 	if (sig == SIGHUP) {
170 		load_securenets();
171 		errno = saved_errno;
172 		return;
173 	}
174 
175 	if (sig == SIGCHLD) {
176 		while (wait3(&status, WNOHANG, NULL) > 0)
177 			children--;
178 	} else {
179 		pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
180 		exit(0);
181 	}
182 
183 	errno = saved_errno;
184 	return;
185 }
186 
187 __dead2 void
188 usage(void)
189 {
190 	fprintf(stderr, "usage: rpc.ypxfrd [-p path]\n");
191 	exit(0);
192 }
193 
194 int
195 main(int argc, char *argv[])
196 {
197 	SVCXPRT *transp = NULL;
198 	int sock;
199 	int proto = 0;
200 	struct sockaddr_in saddr;
201 	int asize = sizeof (saddr);
202 	int ch;
203 
204 	while ((ch = getopt(argc, argv, "p:h")) != -1) {
205 		switch (ch) {
206 		case 'p':
207 			yp_dir = optarg;
208 			break;
209 		default:
210 			usage();
211 			break;
212 		}
213 	}
214 
215 	load_securenets();
216 
217 	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
218 		int ssize = sizeof (int);
219 
220 		if (saddr.sin_family != AF_INET)
221 			exit(1);
222 		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
223 				(char *)&_rpcfdtype, &ssize) == -1)
224 			exit(1);
225 		sock = 0;
226 		_rpcpmstart = 1;
227 		proto = 0;
228 		openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
229 	} else {
230 #ifndef RPC_SVC_FG
231 		int size;
232 		int pid, i;
233 
234 		pid = fork();
235 		if (pid < 0)
236 			err(1, "fork");
237 		if (pid)
238 			exit(0);
239 		size = getdtablesize();
240 		for (i = 0; i < size; i++)
241 			close(i);
242 		i = open(_PATH_CONSOLE, 2);
243 		dup2(i, 1);
244 		dup2(i, 2);
245 		i = open(_PATH_TTY, 2);
246 		if (i >= 0) {
247 			ioctl(i, TIOCNOTTY, NULL);
248 			close(i);
249 		}
250 		openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
251 #endif
252 		sock = RPC_ANYSOCK;
253 		pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
254 	}
255 
256 	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
257 		transp = svcudp_create(sock);
258 		if (transp == NULL) {
259 			_msgout("cannot create udp service.");
260 			exit(1);
261 		}
262 		if (!_rpcpmstart)
263 			proto = IPPROTO_UDP;
264 		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
265 			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp).");
266 			exit(1);
267 		}
268 	}
269 
270 	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
271 		transp = svctcp_create(sock, 0, 0);
272 		if (transp == NULL) {
273 			_msgout("cannot create tcp service.");
274 			exit(1);
275 		}
276 		if (!_rpcpmstart)
277 			proto = IPPROTO_TCP;
278 		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
279 			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp).");
280 			exit(1);
281 		}
282 	}
283 
284 	if (transp == NULL) {
285 		_msgout("could not create a handle");
286 		exit(1);
287 	}
288 	if (_rpcpmstart) {
289 		signal(SIGALRM, (SIG_PF) closedown);
290 		alarm(_RPCSVC_CLOSEDOWN/2);
291 	}
292 
293 	signal(SIGPIPE, SIG_IGN);
294 	signal(SIGCHLD, (SIG_PF) reaper);
295 	signal(SIGTERM, (SIG_PF) reaper);
296 	signal(SIGINT, (SIG_PF) reaper);
297 	signal(SIGHUP, (SIG_PF) reaper);
298 
299 	ypxfrd_svc_run();
300 	_msgout("svc_run returned");
301 	exit(1);
302 	/* NOTREACHED */
303 }
304