yppasswdd_main.c revision 27758 
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 1.2 1997/07/28 18:31:11 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_private.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 1.2 1997/07/28 18:31:11 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;
99char *sockname = YP_SOCKNAME;
100
101static void terminate(sig)
102	int sig;
103{
104	svc_unregister(YPPASSWDPROG, YPPASSWDVERS);
105	svc_unregister(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS);
106	unlink(sockname);
107	exit(0);
108}
109
110static void reload(sig)
111	int sig;
112{
113	load_securenets();
114}
115
116static void
117closedown(int sig)
118{
119	if (_rpcsvcstate == _IDLE) {
120		extern fd_set svc_fdset;
121		static int size;
122		int i, openfd;
123
124		if (_rpcfdtype == SOCK_DGRAM) {
125			unlink(sockname);
126			exit(0);
127		}
128		if (size == 0) {
129			size = getdtablesize();
130		}
131		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
132			if (FD_ISSET(i, &svc_fdset))
133				openfd++;
134		if (openfd <= 1) {
135			unlink(sockname);
136			exit(0);
137		}
138	}
139	if (_rpcsvcstate == _SERVED)
140		_rpcsvcstate = _IDLE;
141
142	(void) signal(SIGALRM, (SIG_PF) closedown);
143	(void) alarm(_RPCSVC_CLOSEDOWN/2);
144}
145
146static void usage()
147{
148	fprintf(stderr, "Usage: %s [-t master.passwd file] [-d domain] \
149[-p path] [-s] [-f] [-m] [-i] [-a] [-v] [-u] [-h]\n",
150		progname);
151	exit(1);
152}
153
154int
155main(argc, argv)
156	int argc;
157	char *argv[];
158{
159	register SVCXPRT *transp = NULL;
160	int sock;
161	int proto = 0;
162	struct sockaddr_in saddr;
163	int asize = sizeof (saddr);
164	int ch;
165	char *mastername;
166	char myname[MAXHOSTNAMELEN + 2];
167	extern int errno;
168	extern int debug;
169
170	debug = 1;
171
172	while ((ch = getopt(argc, argv, "t:d:p:sfamuivh")) != -1) {
173		switch(ch) {
174		case 't':
175			passfile_default = optarg;
176			break;
177		case 'd':
178			yppasswd_domain = optarg;
179			break;
180		case 's':
181			no_chsh++;
182			break;
183		case 'f':
184			no_chfn++;
185			break;
186		case 'p':
187			yp_dir = optarg;
188			break;
189		case 'a':
190			allow_additions++;
191			break;
192		case 'm':
193			multidomain++;
194			break;
195		case 'i':
196			inplace++;
197			break;
198		case 'v':
199			verbose++;
200			break;
201		case 'u':
202			resvport = 0;
203			break;
204		default:
205		case 'h':
206			usage();
207			break;
208		}
209	}
210
211	if (yppasswd_domain == NULL) {
212		if (yp_get_default_domain(&yppasswd_domain)) {
213			yp_error("no domain specified and system domain \
214name isn't set -- aborting");
215		usage();
216		}
217	}
218
219	load_securenets();
220
221	if (getrpcport("localhost", YPPROG, YPVERS, IPPROTO_UDP) <= 0) {
222		yp_error("no ypserv processes registered with local portmap");
223		yp_error("this host is not an NIS server -- aborting");
224		exit(1);
225	}
226
227	if ((mastername = ypxfr_get_master(yppasswd_domain, "passwd.byname",
228						"localhost",0)) == NULL) {
229		yp_error("can't get name of NIS master server for domain %s",
230			 				yppasswd_domain);
231		exit(1);
232	}
233
234	if (gethostname((char *)&myname, sizeof(myname)) == -1) {
235		yp_error("can't get local hostname: %s", strerror(errno));
236		exit(1);
237	}
238
239	if (strncmp(mastername, (char *)&myname, sizeof(myname))) {
240		yp_error("master of %s is %s, but we are %s",
241			"passwd.byname", mastername, myname);
242		yp_error("this host is not the NIS master server for \
243the %s domain -- aborting", yppasswd_domain);
244		exit(1);
245	}
246
247	debug = 0;
248
249	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
250		int ssize = sizeof (int);
251
252		if (saddr.sin_family != AF_INET)
253			exit(1);
254		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
255				(char *)&_rpcfdtype, &ssize) == -1)
256			exit(1);
257		sock = 0;
258		_rpcpmstart = 1;
259		proto = 0;
260		openlog(progname, LOG_PID, LOG_DAEMON);
261	} else {
262		if (!debug) {
263			if (daemon(0,0)) {
264				err(1,"cannot fork");
265			}
266		}
267		openlog(progname, LOG_PID, LOG_DAEMON);
268		sock = RPC_ANYSOCK;
269		(void) pmap_unset(YPPASSWDPROG, YPPASSWDVERS);
270		(void) pmap_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS);
271		unlink(sockname);
272	}
273
274	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
275		transp = svcudp_create(sock);
276		if (transp == NULL) {
277			yp_error("cannot create udp service.");
278			exit(1);
279		}
280		if (!_rpcpmstart)
281			proto = IPPROTO_UDP;
282		if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswdprog_1, proto)) {
283			yp_error("unable to register (YPPASSWDPROG, YPPASSWDVERS, udp).");
284			exit(1);
285		}
286	}
287
288	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
289		transp = svctcp_create(sock, 0, 0);
290		if (transp == NULL) {
291			yp_error("cannot create tcp service.");
292			exit(1);
293		}
294		if (!_rpcpmstart)
295			proto = IPPROTO_TCP;
296		if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswdprog_1, proto)) {
297			yp_error("unable to register (YPPASSWDPROG, YPPASSWDVERS, tcp).");
298			exit(1);
299		}
300	}
301
302	unlink(sockname);
303	transp = svcunix_create(sock, 0, 0, sockname);
304	if (transp == NULL) {
305		yp_error("cannot create AF_LOCAL service.");
306		exit(1);
307	}
308	if (!svc_register(transp, MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, master_yppasswdprog_1, 0)) {
309		yp_error("unable to register (MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, unix).");
310		exit(1);
311	}
312	/* Only root may connect() to the AF_UNIX link. */
313	if (chmod(sockname, 0))
314		err(1, "chmod of %s failed", sockname);
315
316	if (transp == (SVCXPRT *)NULL) {
317		yp_error("could not create a handle");
318		exit(1);
319	}
320	if (_rpcpmstart) {
321		(void) signal(SIGALRM, (SIG_PF) closedown);
322		(void) alarm(_RPCSVC_CLOSEDOWN/2);
323	}
324	/* set up resource limits and block signals */
325	pw_init();
326
327	/* except SIGCHLD, which we need to catch */
328	install_reaper(1);
329	signal(SIGTERM, (SIG_PF) terminate);
330
331	signal(SIGHUP, (SIG_PF) reload);
332
333	svc_run();
334	yp_error("svc_run returned");
335	exit(1);
336	/* NOTREACHED */
337}
338