yppasswdd_main.c revision 19096 
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: yppasswdd_main.c,v 1.4 1996/06/23 22:44:04 wpaul Exp $
33 */
34
35#include "yppasswd.h"
36#include <stdio.h>
37#include <sys/types.h>
38#include <stdlib.h> /* getenv, exit */
39#include <unistd.h>
40#include <string.h>
41#include <sys/param.h>
42#include <rpc/pmap_clnt.h> /* for pmap_unset */
43#include <string.h> /* strcmp */
44#include <signal.h>
45#include <fcntl.h>
46#include <sys/ioctl.h>
47#include <sys/stat.h>
48#include <sys/ttycom.h> /* TIOCNOTTY */
49#ifdef __cplusplus
50#include <sysent.h> /* getdtablesize, open */
51#endif /* __cplusplus */
52#include <memory.h>
53#include <sys/socket.h>
54#include <netinet/in.h>
55#include <syslog.h>
56#include <err.h>
57#include <errno.h>
58#include <rpcsvc/yp.h>
59struct dom_binding {};
60#include <rpcsvc/ypclnt.h>
61#include "yppasswdd_extern.h"
62#include "yppasswd_comm.h"
63#include "ypxfr_extern.h"
64
65#ifndef SIG_PF
66#define	SIG_PF void(*)(int)
67#endif
68
69#ifdef DEBUG
70#define	RPC_SVC_FG
71#endif
72
73#define	_RPCSVC_CLOSEDOWN 120
74#ifndef lint
75static const char rcsid[] = "$Id: yppasswdd_main.c,v 1.4 1996/06/23 22:44:04 wpaul Exp $";
76#endif /* not lint */
77int _rpcpmstart = 0;		/* Started by a port monitor ? */
78static int _rpcfdtype;
79		 /* Whether Stream or Datagram ? */
80	/* States a server can be in wrt request */
81
82#define	_IDLE 0
83#define	_SERVED 1
84#define	_SERVING 2
85
86extern int _rpcsvcstate;	 /* Set when a request is serviced */
87char *progname = "rpc.yppasswdd";
88char *yp_dir = _PATH_YP;
89char *passfile_default = _PATH_YP "master.passwd";
90char *passfile;
91char *yppasswd_domain = NULL;
92int no_chsh = 0;
93int no_chfn = 0;
94int allow_additions = 0;
95int multidomain = 0;
96int verbose = 0;
97int resvport = 1;
98int inplace = 0;
99int yp_sock;
100
101
102static void
103my_svc_run()
104{
105#ifdef FD_SETSIZE
106	fd_set readfds;
107#else
108      int readfds;
109#endif /* def FD_SETSIZE */
110	extern int errno;
111
112	for (;;) {
113
114
115#ifdef FD_SETSIZE
116		readfds = svc_fdset;
117#else
118		readfds = svc_fds;
119#endif /* def FD_SETSIZE */
120		FD_SET(yp_sock, &readfds);
121
122		switch (select(_rpc_dtablesize(), &readfds, (fd_set *)0, (fd_set *)0,
123			       (struct timeval *)0)) {
124		case -1:
125			if (errno == EINTR) {
126				continue;
127			}
128			perror("svc_run: - select failed");
129			return;
130		case 0:
131			continue;
132		default:
133			if (FD_ISSET(yp_sock, &readfds)) {
134				do_master();
135				FD_CLR(yp_sock, &readfds);
136			}
137			svc_getreqset(&readfds);
138		}
139	}
140}
141
142static void terminate(sig)
143	int sig;
144{
145	svc_unregister(YPPASSWDPROG, YPPASSWDVERS);
146	close(yp_sock);
147	unlink(sockname);
148	exit(0);
149}
150
151static void reload(sig)
152	int sig;
153{
154	load_securenets();
155}
156
157static void
158closedown(int sig)
159{
160	if (_rpcsvcstate == _IDLE) {
161		extern fd_set svc_fdset;
162		static int size;
163		int i, openfd;
164
165		if (_rpcfdtype == SOCK_DGRAM) {
166			close(yp_sock);
167			unlink(sockname);
168			exit(0);
169		}
170		if (size == 0) {
171			size = getdtablesize();
172		}
173		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
174			if (FD_ISSET(i, &svc_fdset))
175				openfd++;
176		if (openfd <= 1) {
177			close(yp_sock);
178			unlink(sockname);
179			exit(0);
180		}
181	}
182	if (_rpcsvcstate == _SERVED)
183		_rpcsvcstate = _IDLE;
184
185	(void) signal(SIGALRM, (SIG_PF) closedown);
186	(void) alarm(_RPCSVC_CLOSEDOWN/2);
187}
188
189static void usage()
190{
191	fprintf(stderr, "Usage: %s [-t master.passwd file] [-d domain] \
192[-p path] [-s] [-f] [-m] [-i] [-a] [-v] [-u] [-h]\n",
193		progname);
194	exit(1);
195}
196
197main(argc, argv)
198	int argc;
199	char *argv[];
200{
201	register SVCXPRT *transp = NULL;
202	int sock;
203	int proto = 0;
204	struct sockaddr_in saddr;
205	int asize = sizeof (saddr);
206	int ch;
207	int rval;
208	char *mastername;
209	char myname[MAXHOSTNAMELEN + 2];
210	extern int errno;
211	extern int debug;
212
213	debug = 1;
214
215	while ((ch = getopt(argc, argv, "t:d:p:sfamuivh")) != EOF) {
216		switch(ch) {
217		case 't':
218			passfile_default = optarg;
219			break;
220		case 'd':
221			yppasswd_domain = optarg;
222			break;
223		case 's':
224			no_chsh++;
225			break;
226		case 'f':
227			no_chfn++;
228			break;
229		case 'p':
230			yp_dir = optarg;
231			break;
232		case 'a':
233			allow_additions++;
234			break;
235		case 'm':
236			multidomain++;
237			break;
238		case 'i':
239			inplace++;
240			break;
241		case 'v':
242			verbose++;
243			break;
244		case 'u':
245			resvport = 0;
246			break;
247		default:
248		case 'h':
249			usage();
250			break;
251		}
252	}
253
254	if (yppasswd_domain == NULL) {
255		if (yp_get_default_domain(&yppasswd_domain)) {
256			yp_error("no domain specified and system domain \
257name isn't set -- aborting");
258		usage();
259		}
260	}
261
262	load_securenets();
263
264	if (getrpcport("localhost", YPPROG, YPVERS, IPPROTO_UDP) <= 0) {
265		yp_error("this host is not an NIS server -- aborting");
266		exit(1);
267	}
268
269	if ((mastername = ypxfr_get_master(yppasswd_domain, "passwd.byname",
270						"localhost",0)) == NULL) {
271		yp_error("can't get name of NIS master server");
272		exit(1);
273	}
274
275	if (gethostname((char *)&myname, sizeof(myname)) == -1) {
276		yp_error("can't get local hostname: %s", strerror(errno));
277		exit(1);
278	}
279
280	if (strncmp(mastername, (char *)&myname, sizeof(myname))) {
281		yp_error("this host is not an NIS master server -- aborting");
282		exit(1);
283	}
284
285	debug = 0;
286
287	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
288		int ssize = sizeof (int);
289
290		if (saddr.sin_family != AF_INET)
291			exit(1);
292		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
293				(char *)&_rpcfdtype, &ssize) == -1)
294			exit(1);
295		sock = 0;
296		_rpcpmstart = 1;
297		proto = 0;
298		openlog(progname, LOG_PID, LOG_DAEMON);
299	} else {
300		if (!debug) {
301			if (daemon(0,0)) {
302				err(1,"cannot fork");
303			}
304		}
305		openlog(progname, LOG_PID, LOG_DAEMON);
306		sock = RPC_ANYSOCK;
307		(void) pmap_unset(YPPASSWDPROG, YPPASSWDVERS);
308	}
309
310	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
311		transp = svcudp_create(sock);
312		if (transp == NULL) {
313			yp_error("cannot create udp service.");
314			exit(1);
315		}
316		if (!_rpcpmstart)
317			proto = IPPROTO_UDP;
318		if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswdprog_1, proto)) {
319			yp_error("unable to register (YPPASSWDPROG, YPPASSWDVERS, udp).");
320			exit(1);
321		}
322	}
323
324	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
325		transp = svctcp_create(sock, 0, 0);
326		if (transp == NULL) {
327			yp_error("cannot create tcp service.");
328			exit(1);
329		}
330		if (!_rpcpmstart)
331			proto = IPPROTO_TCP;
332		if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswdprog_1, proto)) {
333			yp_error("unable to register (YPPASSWDPROG, YPPASSWDVERS, tcp).");
334			exit(1);
335		}
336	}
337
338	if (transp == (SVCXPRT *)NULL) {
339		yp_error("could not create a handle");
340		exit(1);
341	}
342	if (_rpcpmstart) {
343		(void) signal(SIGALRM, (SIG_PF) closedown);
344		(void) alarm(_RPCSVC_CLOSEDOWN/2);
345	}
346	/* set up resource limits and block signals */
347	pw_init();
348
349	/* except SIGCHLD, which we need to catch */
350	install_reaper(1);
351	signal(SIGTERM, (SIG_PF) terminate);
352
353	signal(SIGHUP, (SIG_PF) reload);
354
355	unlink(sockname);
356	yp_sock = makeservsock();
357	if (chmod(sockname, 0))
358		err(1, "chmod of %s failed", sockname);
359
360	my_svc_run();
361	yp_error("svc_run returned");
362	exit(1);
363	/* NOTREACHED */
364}
365