yppasswdd_main.c revision 90297 
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
33#ifndef lint
34static const char rcsid[] =
35  "$FreeBSD: head/usr.sbin/rpc.yppasswdd/yppasswdd_main.c 90297 2002-02-06 13:30:31Z des $";
36#endif /* not lint */
37
38#include "yppasswd.h"
39#include <stdio.h>
40#include <sys/types.h>
41#include <stdlib.h> /* getenv, exit */
42#include <unistd.h>
43#include <string.h>
44#include <sys/param.h>
45#include <rpc/pmap_clnt.h> /* for pmap_unset */
46#include <string.h> /* strcmp */
47#include <signal.h>
48#include <fcntl.h>
49#include <sys/ioctl.h>
50#include <sys/stat.h>
51#ifdef __cplusplus
52#include <sysent.h> /* getdtablesize, open */
53#endif /* __cplusplus */
54#include <memory.h>
55#include <sys/socket.h>
56#include <netinet/in.h>
57#include <syslog.h>
58#include <err.h>
59#include <errno.h>
60#include <rpcsvc/yp.h>
61struct dom_binding {};
62#include <rpcsvc/ypclnt.h>
63#include "yppasswdd_extern.h"
64#include "yppasswd_private.h"
65#include "ypxfr_extern.h"
66
67#ifndef SIG_PF
68#define	SIG_PF void(*)(int)
69#endif
70
71#ifdef DEBUG
72#define	RPC_SVC_FG
73#endif
74
75#define	_RPCSVC_CLOSEDOWN 120
76int _rpcpmstart = 0;		/* Started by a port monitor ? */
77static int _rpcfdtype;
78		 /* Whether Stream or Datagram ? */
79	/* States a server can be in wrt request */
80
81#define	_IDLE 0
82#define	_SERVED 1
83#define	_SERVING 2
84
85extern int _rpcsvcstate;	 /* Set when a request is serviced */
86char *progname = "rpc.yppasswdd";
87char *yp_dir = _PATH_YP;
88char *passfile_default = _PATH_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;
96int resvport = 1;
97int inplace = 0;
98char *sockname = YP_SOCKNAME;
99
100static void terminate(sig)
101	int sig;
102{
103	rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL);
104	rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL);
105	unlink(sockname);
106	exit(0);
107}
108
109static void reload(sig)
110	int sig;
111{
112	load_securenets();
113}
114
115static void
116closedown(int sig)
117{
118	if (_rpcsvcstate == _IDLE) {
119		extern fd_set svc_fdset;
120		static int size;
121		int i, openfd;
122
123		if (_rpcfdtype == SOCK_DGRAM) {
124			unlink(sockname);
125			exit(0);
126		}
127		if (size == 0) {
128			size = getdtablesize();
129		}
130		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
131			if (FD_ISSET(i, &svc_fdset))
132				openfd++;
133		if (openfd <= 1) {
134			unlink(sockname);
135			exit(0);
136		}
137	}
138	if (_rpcsvcstate == _SERVED)
139		_rpcsvcstate = _IDLE;
140
141	(void) signal(SIGALRM, (SIG_PF) closedown);
142	(void) alarm(_RPCSVC_CLOSEDOWN/2);
143}
144
145static void usage()
146{
147	fprintf(stderr, "%s\n%s\n",
148"usage: rpc.yppasswdd [-t master.passwd file] [-d domain] [-p path] [-s]",
149"                     [-f] [-m] [-i] [-a] [-v] [-u] [-h]");
150	exit(1);
151}
152
153int
154main(argc, argv)
155	int argc;
156	char *argv[];
157{
158	register SVCXPRT *transp = NULL;
159	struct sockaddr_in saddr;
160	int asize = sizeof (saddr);
161	struct netconfig *nconf;
162	void *localhandle;
163	int ch;
164	char *mastername;
165	char myname[MAXHOSTNAMELEN + 2];
166
167	extern int debug;
168
169	debug = 1;
170
171	while ((ch = getopt(argc, argv, "t:d:p:sfamuivh")) != -1) {
172		switch (ch) {
173		case 't':
174			passfile_default = optarg;
175			break;
176		case 'd':
177			yppasswd_domain = optarg;
178			break;
179		case 's':
180			no_chsh++;
181			break;
182		case 'f':
183			no_chfn++;
184			break;
185		case 'p':
186			yp_dir = optarg;
187			break;
188		case 'a':
189			allow_additions++;
190			break;
191		case 'm':
192			multidomain++;
193			break;
194		case 'i':
195			inplace++;
196			break;
197		case 'v':
198			verbose++;
199			break;
200		case 'u':
201			resvport = 0;
202			break;
203		default:
204		case 'h':
205			usage();
206			break;
207		}
208	}
209
210	if (yppasswd_domain == NULL) {
211		if (yp_get_default_domain(&yppasswd_domain)) {
212			yp_error("no domain specified and system domain \
213name isn't set -- aborting");
214		usage();
215		}
216	}
217
218	load_securenets();
219
220	if (getrpcport("localhost", YPPROG, YPVERS, IPPROTO_UDP) <= 0) {
221		yp_error("no ypserv processes registered with local portmap");
222		yp_error("this host is not an NIS server -- aborting");
223		exit(1);
224	}
225
226	if ((mastername = ypxfr_get_master(yppasswd_domain, "passwd.byname",
227						"localhost",0)) == NULL) {
228		yp_error("can't get name of NIS master server for domain %s",
229			 				yppasswd_domain);
230		exit(1);
231	}
232
233	if (gethostname((char *)&myname, sizeof(myname)) == -1) {
234		yp_error("can't get local hostname: %s", strerror(errno));
235		exit(1);
236	}
237
238	if (strncasecmp(mastername, (char *)&myname, sizeof(myname))) {
239		yp_error("master of %s is %s, but we are %s",
240			"passwd.byname", mastername, myname);
241		yp_error("this host is not the NIS master server for \
242the %s domain -- aborting", yppasswd_domain);
243		exit(1);
244	}
245
246	debug = 0;
247
248	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
249		int ssize = sizeof (int);
250		if (saddr.sin_family != AF_INET)
251			exit(1);
252		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
253		    (char *)&_rpcfdtype, &ssize) == -1)
254			exit(1);
255		_rpcpmstart = 1;
256	}
257
258	if (!debug && _rpcpmstart == 0) {
259		if (daemon(0,0)) {
260			err(1,"cannot fork");
261		}
262	}
263	openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON);
264
265	rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL);
266	rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL);
267
268	if (svc_create(yppasswdprog_1, YPPASSWDPROG, YPPASSWDVERS, "netpath") == 0) {
269		yp_error("cannot create yppasswd service.");
270		exit(1);
271	}
272	if (svc_create(master_yppasswdprog_1, MASTER_YPPASSWDPROG,
273	    MASTER_YPPASSWDVERS, "netpath") == 0) {
274		yp_error("cannot create master_yppasswd service.");
275		exit(1);
276	}
277
278	nconf = NULL;
279	localhandle = setnetconfig();
280	while ((nconf = getnetconfig(localhandle)) != NULL) {
281		if (nconf->nc_protofmly != NULL &&
282		    strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
283			break;
284	}
285	if (nconf == NULL) {
286		yp_error("getnetconfigent unix: %s", nc_sperror());
287		exit(1);
288	}
289	unlink(sockname);
290	transp = svcunix_create(RPC_ANYSOCK, 0, 0, sockname);
291	if (transp == NULL) {
292		yp_error("cannot create AF_LOCAL service.");
293		exit(1);
294	}
295	if (!svc_reg(transp, MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS,
296	    master_yppasswdprog_1, nconf)) {
297		yp_error("unable to register (MASTER_YPPASSWDPROG,
298		    MASTER_YPPASSWDVERS, unix).");
299		exit(1);
300	}
301	endnetconfig(localhandle);
302
303	/* Only root may connect() to the AF_UNIX link. */
304	if (chmod(sockname, 0))
305		err(1, "chmod of %s failed", sockname);
306
307	if (transp == (SVCXPRT *)NULL) {
308		yp_error("could not create a handle");
309		exit(1);
310	}
311	if (_rpcpmstart) {
312		(void) signal(SIGALRM, (SIG_PF) closedown);
313		(void) alarm(_RPCSVC_CLOSEDOWN/2);
314	}
315	/* set up resource limits and block signals */
316	pw_init();
317
318	/* except SIGCHLD, which we need to catch */
319	install_reaper(1);
320	signal(SIGTERM, (SIG_PF) terminate);
321
322	signal(SIGHUP, (SIG_PF) reload);
323
324	svc_run();
325	yp_error("svc_run returned");
326	exit(1);
327	/* NOTREACHED */
328}
329