yppasswdd_main.c revision 59218 
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 59218 2000-04-14 06:49:16Z imp $";
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#include <sys/ttycom.h> /* TIOCNOTTY */
52#ifdef __cplusplus
53#include <sysent.h> /* getdtablesize, open */
54#endif /* __cplusplus */
55#include <memory.h>
56#include <sys/socket.h>
57#include <netinet/in.h>
58#include <syslog.h>
59#include <err.h>
60#include <errno.h>
61#include <rpcsvc/yp.h>
62struct dom_binding {};
63#include <rpcsvc/ypclnt.h>
64#include "yppasswdd_extern.h"
65#include "yppasswd_private.h"
66#include "ypxfr_extern.h"
67
68#ifndef SIG_PF
69#define	SIG_PF void(*)(int)
70#endif
71
72#ifdef DEBUG
73#define	RPC_SVC_FG
74#endif
75
76#define	_RPCSVC_CLOSEDOWN 120
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, "%s\n%s\n",
149"usage: rpc.yppasswdd [-t master.passwd file] [-d domain] [-p path] [-s]",
150"                     [-f] [-m] [-i] [-a] [-v] [-u] [-h]");
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 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
251		if (saddr.sin_family != AF_INET)
252			exit(1);
253		if (getsockopt(0, SOL_SOCKET, SO_TYPE,
254				(char *)&_rpcfdtype, &ssize) == -1)
255			exit(1);
256		sock = 0;
257		_rpcpmstart = 1;
258		proto = 0;
259		openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON);
260	} else {
261		if (!debug) {
262			if (daemon(0,0)) {
263				err(1,"cannot fork");
264			}
265		}
266		openlog("rpc.yppasswdd", LOG_PID, LOG_DAEMON);
267		sock = RPC_ANYSOCK;
268		(void) pmap_unset(YPPASSWDPROG, YPPASSWDVERS);
269		(void) pmap_unset(MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS);
270		unlink(sockname);
271	}
272
273	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_DGRAM)) {
274		transp = svcudp_create(sock);
275		if (transp == NULL) {
276			yp_error("cannot create udp service.");
277			exit(1);
278		}
279		if (!_rpcpmstart)
280			proto = IPPROTO_UDP;
281		if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswdprog_1, proto)) {
282			yp_error("unable to register (YPPASSWDPROG, YPPASSWDVERS, udp).");
283			exit(1);
284		}
285	}
286
287	if ((_rpcfdtype == 0) || (_rpcfdtype == SOCK_STREAM)) {
288		transp = svctcp_create(sock, 0, 0);
289		if (transp == NULL) {
290			yp_error("cannot create tcp service.");
291			exit(1);
292		}
293		if (!_rpcpmstart)
294			proto = IPPROTO_TCP;
295		if (!svc_register(transp, YPPASSWDPROG, YPPASSWDVERS, yppasswdprog_1, proto)) {
296			yp_error("unable to register (YPPASSWDPROG, YPPASSWDVERS, tcp).");
297			exit(1);
298		}
299	}
300
301	unlink(sockname);
302	transp = svcunix_create(sock, 0, 0, sockname);
303	if (transp == NULL) {
304		yp_error("cannot create AF_LOCAL service.");
305		exit(1);
306	}
307	if (!svc_register(transp, MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, master_yppasswdprog_1, 0)) {
308		yp_error("unable to register (MASTER_YPPASSWDPROG, MASTER_YPPASSWDVERS, unix).");
309		exit(1);
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	/* set up resource limits and block signals */
324	pw_init();
325
326	/* except SIGCHLD, which we need to catch */
327	install_reaper(1);
328	signal(SIGTERM, (SIG_PF) terminate);
329
330	signal(SIGHUP, (SIG_PF) reload);
331
332	svc_run();
333	yp_error("svc_run returned");
334	exit(1);
335	/* NOTREACHED */
336}
337