ypxfrd_main.c revision 22997 
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 *	$Id$
33 */
34
35#include "ypxfrd.h"
36#include <stdio.h>
37#include <stdlib.h> /* getenv, exit */
38#include <rpc/pmap_clnt.h> /* for pmap_unset */
39#include <string.h> /* strcmp */
40#include <signal.h>
41#include <sys/ttycom.h> /* TIOCNOTTY */
42#ifdef __cplusplus
43#include <sysent.h> /* getdtablesize, open */
44#endif /* __cplusplus */
45#include <memory.h>
46#include <sys/socket.h>
47#include <netinet/in.h>
48#include <syslog.h>
49#include "ypxfrd_extern.h"
50#include <sys/wait.h>
51#include <errno.h>
52
53#ifndef SIG_PF
54#define	SIG_PF void(*)(int)
55#endif
56
57#ifdef DEBUG
58#define	RPC_SVC_FG
59#endif
60
61#define	_RPCSVC_CLOSEDOWN 120
62#ifndef lint
63static const char rcsid[] = "$Id$";
64#endif /* not lint */
65int _rpcpmstart;		/* Started by a port monitor ? */
66static int _rpcfdtype;
67		 /* Whether Stream or Datagram ? */
68	/* States a server can be in wrt request */
69
70#define	_IDLE 0
71#define	_SERVED 1
72#define	_SERVING 2
73
74extern int _rpcsvcstate;	 /* Set when a request is serviced */
75
76char *progname = "rpc.ypxfrd";
77char *yp_dir = "/var/yp/";
78
79static
80void _msgout(char* msg)
81{
82#ifdef RPC_SVC_FG
83	if (_rpcpmstart)
84		syslog(LOG_ERR, msg);
85	else
86		(void) fprintf(stderr, "%s\n", msg);
87#else
88	syslog(LOG_ERR, msg);
89#endif
90}
91
92static void
93closedown(int sig)
94{
95	if (_rpcsvcstate == _IDLE) {
96		extern fd_set svc_fdset;
97		static int size;
98		int i, openfd;
99
100		if (_rpcfdtype == SOCK_DGRAM)
101			exit(0);
102		if (size == 0) {
103			size = getdtablesize();
104		}
105		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
106			if (FD_ISSET(i, &svc_fdset))
107				openfd++;
108		if (openfd <= 1)
109			exit(0);
110	}
111	if (_rpcsvcstate == _SERVED)
112		_rpcsvcstate = _IDLE;
113
114	(void) signal(SIGALRM, (SIG_PF) closedown);
115	(void) alarm(_RPCSVC_CLOSEDOWN/2);
116}
117
118
119static void
120ypxfrd_svc_run()
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 ypserv 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			perror("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
158static void reaper(sig)
159	int sig;
160{
161	int status;
162
163	if (sig == SIGHUP) {
164		load_securenets();
165		return;
166	}
167
168	if (sig == SIGCHLD) {
169		while (wait3(&status, WNOHANG, NULL) > 0)
170			children--;
171	} else {
172		(void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
173		exit(0);
174	}
175}
176
177void usage()
178{
179	fprintf(stderr, "%s [-p path]\n", progname);
180	exit(0);
181}
182
183main(argc, argv)
184	int argc;
185	char *argv[];
186{
187	register SVCXPRT *transp;
188	int sock;
189	int proto;
190	struct sockaddr_in saddr;
191	int asize = sizeof (saddr);
192	int ch;
193
194	while ((ch = getopt(argc, argv, "p:h")) != EOF) {
195		switch(ch) {
196		case 'p':
197			yp_dir = optarg;
198			break;
199		default:
200			usage();
201			break;
202		}
203	}
204
205	load_securenets();
206
207	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
208		int ssize = sizeof (int);
209
210		if (saddr.sin_family != AF_INET)
211			exit(1);
212		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
213				(char *)&_rpcfdtype, &ssize) == -1)
214			exit(1);
215		sock = 0;
216		_rpcpmstart = 1;
217		proto = 0;
218		openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
219	} else {
220#ifndef RPC_SVC_FG
221		int size;
222		int pid, i;
223
224		pid = fork();
225		if (pid < 0) {
226			perror("cannot fork");
227			exit(1);
228		}
229		if (pid)
230			exit(0);
231		size = getdtablesize();
232		for (i = 0; i < size; i++)
233			(void) close(i);
234		i = open("/dev/console", 2);
235		(void) dup2(i, 1);
236		(void) dup2(i, 2);
237		i = open("/dev/tty", 2);
238		if (i >= 0) {
239			(void) ioctl(i, TIOCNOTTY, (char *)NULL);
240			(void) close(i);
241		}
242		openlog("rpc.ypxfrd", LOG_PID, LOG_DAEMON);
243#endif
244		sock = RPC_ANYSOCK;
245		(void) pmap_unset(YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS);
246	}
247
248	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
249		transp = svcudp_create(sock);
250		if (transp == NULL) {
251			_msgout("cannot create udp service.");
252			exit(1);
253		}
254		if (!_rpcpmstart)
255			proto = IPPROTO_UDP;
256		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
257			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, udp).");
258			exit(1);
259		}
260	}
261
262	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
263		transp = svctcp_create(sock, 0, 0);
264		if (transp == NULL) {
265			_msgout("cannot create tcp service.");
266			exit(1);
267		}
268		if (!_rpcpmstart)
269			proto = IPPROTO_TCP;
270		if (!svc_register(transp, YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, ypxfrd_freebsd_prog_1, proto)) {
271			_msgout("unable to register (YPXFRD_FREEBSD_PROG, YPXFRD_FREEBSD_VERS, tcp).");
272			exit(1);
273		}
274	}
275
276	if (transp == (SVCXPRT *)NULL) {
277		_msgout("could not create a handle");
278		exit(1);
279	}
280	if (_rpcpmstart) {
281		(void) signal(SIGALRM, (SIG_PF) closedown);
282		(void) alarm(_RPCSVC_CLOSEDOWN/2);
283	}
284
285	(void) signal(SIGPIPE, SIG_IGN);
286	(void) signal(SIGCHLD, (SIG_PF) reaper);
287	(void) signal(SIGTERM, (SIG_PF) reaper);
288	(void) signal(SIGINT, (SIG_PF) reaper);
289	(void) signal(SIGHUP, (SIG_PF) reaper);
290
291	ypxfrd_svc_run();
292	_msgout("svc_run returned");
293	exit(1);
294	/* NOTREACHED */
295}
296