yppasswdd_main.c revision 96391 
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 96391 2002-05-11 04:10:49Z alfred $";
36#endif /* not lint */
37
38#include <sys/param.h>
39#include <sys/ioctl.h>
40#include <sys/stat.h>
41#include <sys/socket.h>
42#include <sys/time.h>
43#include <sys/resource.h>
44#include <netinet/in.h>
45
46#include <err.h>
47#include <errno.h>
48#include <fcntl.h>
49#include <memory.h>
50#include <signal.h>
51#include <stdio.h>
52#include <stdlib.h> /* getenv, exit */
53#include <string.h>
54#include <string.h> /* strcmp */
55#include <syslog.h>
56#include <unistd.h>
57
58#include <rpc/rpc.h>
59#include <rpc/pmap_clnt.h> /* for pmap_unset */
60#include <rpcsvc/yp.h>
61struct dom_binding {};
62#include <rpcsvc/ypclnt.h>
63
64#include "yppasswd.h"
65#include "yppasswdd_extern.h"
66#include "yppasswd_private.h"
67#include "ypxfr_extern.h"
68#include "yp_extern.h"
69
70#ifndef SIG_PF
71#define	SIG_PF void(*)(int)
72#endif
73
74#ifdef DEBUG
75#define	RPC_SVC_FG
76#endif
77
78#define	_RPCSVC_CLOSEDOWN 120
79int _rpcpmstart = 0;		/* Started by a port monitor ? */
80static int _rpcfdtype;
81		 /* Whether Stream or Datagram ? */
82	/* States a server can be in wrt request */
83
84#define	_IDLE 0
85#define	_SERVED 1
86#define	_SERVING 2
87
88static char _localhost[] = "localhost";
89static char _passwd_byname[] = "passwd.byname";
90extern int _rpcsvcstate;	 /* Set when a request is serviced */
91static char _progname[] = "rpc.yppasswdd";
92char *progname = _progname;
93static char _yp_dir[] = _PATH_YP;
94char *yp_dir = _yp_dir;
95static char _passfile_default[] = _PATH_YP "master.passwd";
96char *passfile_default = _passfile_default;
97char *passfile;
98char *yppasswd_domain = NULL;
99int no_chsh = 0;
100int no_chfn = 0;
101int allow_additions = 0;
102int multidomain = 0;
103int verbose = 0;
104int resvport = 1;
105int inplace = 0;
106char sockname[] = YP_SOCKNAME;
107
108static void
109terminate(int sig __unused)
110{
111	rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL);
112	rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL);
113	unlink(sockname);
114	exit(0);
115}
116
117static void
118reload(int sig __unused)
119{
120	load_securenets();
121}
122
123static void
124closedown(int sig __unused)
125{
126	if (_rpcsvcstate == _IDLE) {
127		extern fd_set svc_fdset;
128		static int size;
129		int i, openfd;
130
131		if (_rpcfdtype == SOCK_DGRAM) {
132			unlink(sockname);
133			exit(0);
134		}
135		if (size == 0) {
136			size = getdtablesize();
137		}
138		for (i = 0, openfd = 0; i < size && openfd < 2; i++)
139			if (FD_ISSET(i, &svc_fdset))
140				openfd++;
141		if (openfd <= 1) {
142			unlink(sockname);
143			exit(0);
144		}
145	}
146	if (_rpcsvcstate == _SERVED)
147		_rpcsvcstate = _IDLE;
148
149	(void) signal(SIGALRM, (SIG_PF) closedown);
150	(void) alarm(_RPCSVC_CLOSEDOWN/2);
151}
152
153static void
154usage(void)
155{
156	fprintf(stderr, "%s\n%s\n",
157"usage: rpc.yppasswdd [-t master.passwd file] [-d domain] [-p path] [-s]",
158"                     [-f] [-m] [-i] [-a] [-v] [-u] [-h]");
159	exit(1);
160}
161
162int
163main(int argc, char *argv[])
164{
165	struct rlimit rlim;
166	SVCXPRT *transp = NULL;
167	struct sockaddr_in saddr;
168	int asize = sizeof (saddr);
169	struct netconfig *nconf;
170	void *localhandle;
171	int ch;
172	char *mastername;
173	char myname[MAXHOSTNAMELEN + 2];
174
175	extern int debug;
176
177	debug = 1;
178
179	while ((ch = getopt(argc, argv, "t:d:p:sfamuivh")) != -1) {
180		switch (ch) {
181		case 't':
182			passfile_default = optarg;
183			break;
184		case 'd':
185			yppasswd_domain = optarg;
186			break;
187		case 's':
188			no_chsh++;
189			break;
190		case 'f':
191			no_chfn++;
192			break;
193		case 'p':
194			yp_dir = optarg;
195			break;
196		case 'a':
197			allow_additions++;
198			break;
199		case 'm':
200			multidomain++;
201			break;
202		case 'i':
203			inplace++;
204			break;
205		case 'v':
206			verbose++;
207			break;
208		case 'u':
209			resvport = 0;
210			break;
211		default:
212		case 'h':
213			usage();
214			break;
215		}
216	}
217
218	if (yppasswd_domain == NULL) {
219		if (yp_get_default_domain(&yppasswd_domain)) {
220			yp_error("no domain specified and system domain \
221name isn't set -- aborting");
222		usage();
223		}
224	}
225
226	load_securenets();
227
228	if (getrpcport(_localhost, YPPROG, YPVERS, IPPROTO_UDP) <= 0) {
229		yp_error("no ypserv processes registered with local portmap");
230		yp_error("this host is not an NIS server -- aborting");
231		exit(1);
232	}
233
234	if ((mastername = ypxfr_get_master(yppasswd_domain,
235		 _passwd_byname, _localhost, 0)) == NULL) {
236		yp_error("can't get name of NIS master server for domain %s",
237			 				yppasswd_domain);
238		exit(1);
239	}
240
241	if (gethostname((char *)&myname, sizeof(myname)) == -1) {
242		yp_error("can't get local hostname: %s", strerror(errno));
243		exit(1);
244	}
245
246	if (strncasecmp(mastername, (char *)&myname, sizeof(myname))) {
247		yp_error("master of %s is %s, but we are %s",
248			"passwd.byname", mastername, myname);
249		yp_error("this host is not the NIS master server for \
250the %s domain -- aborting", yppasswd_domain);
251		exit(1);
252	}
253
254	debug = 0;
255
256	if (getsockname(0, (struct sockaddr *)&saddr, &asize) == 0) {
257		int ssize = sizeof (int);
258		if (saddr.sin_family != AF_INET)
259			exit(1);
260		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
261		    (char *)&_rpcfdtype, &ssize) == -1)
262			exit(1);
263		_rpcpmstart = 1;
264	}
265
266	if (!debug && _rpcpmstart == 0) {
267		if (daemon(0,0)) {
268			err(1,"cannot fork");
269		}
270	}
271	openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON);
272
273	rpcb_unset(YPPASSWDPROG, YPPASSWDVERS, NULL);
274	rpcb_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, NULL);
275
276	if (svc_create(yppasswdprog_1, YPPASSWDPROG, YPPASSWDVERS, "netpath") == 0) {
277		yp_error("cannot create yppasswd service.");
278		exit(1);
279	}
280	if (svc_create(master_yppasswdprog_1, MASTER_YPPASSWDPROG,
281	    MASTER_YPPASSWDVERS, "netpath") == 0) {
282		yp_error("cannot create master_yppasswd service.");
283		exit(1);
284	}
285
286	nconf = NULL;
287	localhandle = setnetconfig();
288	while ((nconf = getnetconfig(localhandle)) != NULL) {
289		if (nconf->nc_protofmly != NULL &&
290		    strcmp(nconf->nc_protofmly, NC_LOOPBACK) == 0)
291			break;
292	}
293	if (nconf == NULL) {
294		yp_error("getnetconfigent unix: %s", nc_sperror());
295		exit(1);
296	}
297	unlink(sockname);
298	transp = svcunix_create(RPC_ANYSOCK, 0, 0, sockname);
299	if (transp == NULL) {
300		yp_error("cannot create AF_LOCAL service.");
301		exit(1);
302	}
303	if (!svc_reg(transp, MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS,
304	    master_yppasswdprog_1, nconf)) {
305		yp_error("unable to register (MASTER_YPPASSWDPROG, \
306		    MASTER_YPPASSWDVERS, unix).");
307		exit(1);
308	}
309	endnetconfig(localhandle);
310
311	/* Only root may connect() to the AF_UNIX link. */
312	if (chmod(sockname, 0))
313		err(1, "chmod of %s failed", sockname);
314
315	if (transp == (SVCXPRT *)NULL) {
316		yp_error("could not create a handle");
317		exit(1);
318	}
319	if (_rpcpmstart) {
320		(void) signal(SIGALRM, (SIG_PF) closedown);
321		(void) alarm(_RPCSVC_CLOSEDOWN/2);
322	}
323
324	/* Unlimited resource limits. */
325	rlim.rlim_cur = rlim.rlim_max = RLIM_INFINITY;
326	(void)setrlimit(RLIMIT_CPU, &rlim);
327	(void)setrlimit(RLIMIT_FSIZE, &rlim);
328	(void)setrlimit(RLIMIT_STACK, &rlim);
329	(void)setrlimit(RLIMIT_DATA, &rlim);
330	(void)setrlimit(RLIMIT_RSS, &rlim);
331
332	/* Don't drop core (not really necessary, but GP's). */
333	rlim.rlim_cur = rlim.rlim_max = 0;
334	(void)setrlimit(RLIMIT_CORE, &rlim);
335
336	/* Turn off signals. */
337	(void)signal(SIGALRM, SIG_IGN);
338	(void)signal(SIGHUP, (SIG_PF) reload);
339	(void)signal(SIGINT, SIG_IGN);
340	(void)signal(SIGPIPE, SIG_IGN);
341	(void)signal(SIGQUIT, SIG_IGN);
342	(void)signal(SIGTERM, (SIG_PF) terminate);
343
344	svc_run();
345	yp_error("svc_run returned");
346	exit(1);
347	/* NOTREACHED */
348}
349