yppasswdd_main.c revision 14063 
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 1.8 1996/02/09 04:21:35 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 1.8 1996/02/09 04:21:35 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 *passfile_default = "/var/yp/master.passwd";
89char *passfile;
90char *yppasswd_domain = NULL;
91int no_chsh = 0;
92int no_chfn = 0;
93int allow_additions = 0;
94int multidomain = 0;
95int verbose = 0;
96char *yp_dir = "/var/yp/";
97int yp_sock;
98
99
100static void
101my_svc_run()
102{
103#ifdef FD_SETSIZE
104	fd_set readfds;
105#else
106      int readfds;
107#endif /* def FD_SETSIZE */
108	extern int errno;
109
110	for (;;) {
111
112
113#ifdef FD_SETSIZE
114		readfds = svc_fdset;
115#else
116		readfds = svc_fds;
117#endif /* def FD_SETSIZE */
118		FD_SET(yp_sock, &readfds);
119
120		switch (select(_rpc_dtablesize(), &readfds, (fd_set *)0, (fd_set *)0,
121			       (struct timeval *)0)) {
122		case -1:
123			if (errno == EINTR) {
124				continue;
125			}
126			perror("svc_run: - select failed");
127			return;
128		case 0:
129			continue;
130		default:
131			if (FD_ISSET(yp_sock, &readfds)) {
132				do_master();
133				FD_CLR(yp_sock, &readfds);
134			}
135			svc_getreqset(&readfds);
136		}
137	}
138}
139
140static void terminate(sig)
141	int sig;
142{
143	svc_unregister(YPPASSWDPROG, YPPASSWDVERS);
144	close(yp_sock);
145	unlink(sockname);
146	exit(0);
147}
148
149static void
150closedown(int sig)
151{
152	if (_rpcsvcstate == _IDLE) {
153		extern fd_set svc_fdset;
154		static int size;
155		int i, openfd;
156
157		if (_rpcfdtype == SOCK_DGRAM) {
158			close(yp_sock);
159			unlink(sockname);
160			exit(0);
161		}
162		if (size == 0) {
163			size = getdtablesize();
164		}
165		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
166			if (FD_ISSET(i, &svc_fdset))
167				openfd++;
168		if (openfd <= 1) {
169			close(yp_sock);
170			unlink(sockname);
171			exit(0);
172		}
173	}
174	if (_rpcsvcstate == _SERVED)
175		_rpcsvcstate = _IDLE;
176
177	(void) signal(SIGALRM, (SIG_PF) closedown);
178	(void) alarm(_RPCSVC_CLOSEDOWN/2);
179}
180
181static void usage()
182{
183	fprintf(stderr, "Usage: %s [-t master.passwd file] [-d domain] \
184[-p path] [-s] [-f] [-m] [-a] [-v] [-h]\n",
185		progname);
186	exit(1);
187}
188
189main(argc, argv)
190	int argc;
191	char *argv[];
192{
193	register SVCXPRT *transp = NULL;
194	int sock;
195	int proto = 0;
196	struct sockaddr_in saddr;
197	int asize = sizeof (saddr);
198	int ch;
199	int rval;
200	char *mastername;
201	char myname[MAXHOSTNAMELEN + 2];
202	extern int errno;
203	extern int debug;
204
205	debug = 1;
206
207	while ((ch = getopt(argc, argv, "t:d:p:sfamvh")) != EOF) {
208		switch(ch) {
209		case 't':
210			passfile_default = optarg;
211			break;
212		case 'd':
213			yppasswd_domain = optarg;
214			break;
215		case 's':
216			no_chsh++;
217			break;
218		case 'f':
219			no_chfn++;
220			break;
221		case 'p':
222			yp_dir = optarg;
223			break;
224		case 'a':
225			allow_additions++;
226			break;
227		case 'm':
228			multidomain++;
229			break;
230		case 'v':
231			verbose++;
232			break;
233		default:
234		case 'h':
235			usage();
236			break;
237		}
238	}
239
240	if (yppasswd_domain == NULL) {
241		if (yp_get_default_domain(&yppasswd_domain)) {
242			yp_error("no domain specified and system domain \
243name isn't set -- aborting");
244		usage();
245		}
246	}
247
248	if (getrpcport("localhost", YPPROG, YPVERS, IPPROTO_UDP) <= 0) {
249		yp_error("this host is not an NIS server -- aborting");
250		exit(1);
251	}
252
253	if ((mastername = ypxfr_get_master(yppasswd_domain, "passwd.byname",
254						"localhost",0)) == NULL) {
255		yp_error("can't get name of NIS master server");
256		exit(1);
257	}
258
259	if (gethostname((char *)&myname, sizeof(myname)) == -1) {
260		yp_error("can't get local hostname: %s", strerror(errno));
261		exit(1);
262	}
263
264	if (strncmp(mastername, (char *)&myname, sizeof(myname))) {
265		yp_error("this host is not an NIS master server -- aborting");
266		exit(1);
267	}
268
269	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
270		int ssize = sizeof (int);
271
272		if (saddr.sin_family != AF_INET)
273			exit(1);
274		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
275				(char *)&_rpcfdtype, &ssize) == -1)
276			exit(1);
277		sock = 0;
278		_rpcpmstart = 1;
279		proto = 0;
280		openlog(progname, LOG_PID, LOG_DAEMON);
281	} else {
282#ifndef RPC_SVC_FG
283		int size;
284		int pid, i;
285
286		pid = fork();
287		if (pid < 0) {
288			perror("cannot fork");
289			exit(1);
290		}
291		if (pid)
292			exit(0);
293		size = getdtablesize();
294		for (i = 0; i < size; i++)
295			(void) close(i);
296		i = open("/dev/console", 2);
297		(void) dup2(i, 1);
298		(void) dup2(i, 2);
299		i = open("/dev/tty", 2);
300		if (i >= 0) {
301			(void) ioctl(i, TIOCNOTTY, (char *)NULL);
302			(void) close(i);
303		}
304		openlog(progname, LOG_PID, LOG_DAEMON);
305#endif
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 resporce 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	unlink(sockname);
354	yp_sock = makeservsock();
355	if (chmod(sockname, 0))
356		err(1, "chmod of %s failed", sockname);
357
358	my_svc_run();
359	yp_error("svc_run returned");
360	exit(1);
361	/* NOTREACHED */
362}
363