2 * Copyright (c) 1997-1999 Erez Zadok
3 * Copyright (c) 1989 Jan-Simon Pendry
4 * Copyright (c) 1989 Imperial College of Science, Technology & Medicine
5 * Copyright (c) 1989 The Regents of the University of California.
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgment:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
41 * $Id: info_nis.c,v 1.5 1999/08/22 05:12:51 ezk Exp $
46 * Get info from NIS map
51 #endif /* HAVE_CONFIG_H */
57 * NIS+ servers in NIS compat mode don't have yp_order()
59 * has_yp_order = 1 NIS server
63 static int has_yp_order = -1;
65 /* forward declarations */
66 int nis_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *));
67 int nis_search(mnt_map *m, char *map, char *key, char **val, time_t *tp);
68 int nis_init(mnt_map *m, char *map, time_t *tp);
69 int nis_isup(mnt_map *m, char *map);
70 int nis_mtime(mnt_map *m, char *map, time_t *tp);
73 typedef void (*nis_callback_fxn_t)(mnt_map *, char *, char *);
74 #ifndef DEFINED_YPALL_CALLBACK_FXN_T
75 typedef int (*ypall_callback_fxn_t)();
76 #endif /* DEFINED_YPALL_CALLBACK_FXN_T */
78 struct nis_callback_data {
81 nis_callback_fxn_t ncd_fn;
84 /* Map to the right version of yp_all */
85 #ifdef HAVE_BAD_YP_ALL
86 # define yp_all am_yp_all
87 static int am_yp_all(char *indomain, char *inmap, struct ypall_callback *incallback);
88 #endif /* HAVE_BAD_YP_ALL */
92 * Figure out the nis domain name
95 determine_nis_domain(void)
97 static int nis_not_running = 0;
98 char default_domain[YPMAXDOMAIN];
103 if (getdomainname(default_domain, sizeof(default_domain)) < 0) {
105 plog(XLOG_ERROR, "getdomainname: %m");
108 if (!*default_domain) {
111 plog(XLOG_WARNING, "NIS domain name is not set. NIS ignored.");
115 gopt.nis_domain = strdup(default_domain);
122 * Callback from yp_all
125 callback(int status, char *key, int kl, char *val, int vl, char *data)
127 struct nis_callback_data *ncdp = (struct nis_callback_data *) data;
129 if (status == YP_TRUE) {
131 /* add to list of maps */
132 char *kp = strnsave(key, kl);
133 char *vp = strnsave(val, vl);
135 (*ncdp->ncd_fn) (ncdp->ncd_m, kp, vp);
137 /* we want more ... */
142 /* NOMORE means end of map - otherwise log error */
143 if (status != YP_NOMORE) {
144 /* check what went wrong */
145 int e = ypprot_err(status);
148 plog(XLOG_ERROR, "yp enumeration of %s: %s, status=%d, e=%d",
149 ncdp->ncd_map, yperr_string(e), status, e);
150 #else /* not DEBUG */
151 plog(XLOG_ERROR, "yp enumeration of %s: %s", ncdp->ncd_map, yperr_string(e));
152 #endif /* not DEBUG */
160 nis_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *))
163 struct nis_callback_data data;
164 struct ypall_callback cbinfo;
166 if (!gopt.nis_domain) {
167 error = determine_nis_domain();
174 cbinfo.data = (voidp) &data;
175 cbinfo.foreach = (ypall_callback_fxn_t) callback;
178 * If you are using NIS and your yp_all function is "broken", you have to
179 * get it fixed. The bug in yp_all() is that it does not close a TCP
180 * connection to ypserv, and this ypserv runs out of open file descriptors,
181 * getting into an infinite loop, thus all YP clients eventually unbind
184 error = yp_all(gopt.nis_domain, map, &cbinfo);
187 plog(XLOG_ERROR, "error grabbing nis map of %s: %s", map, yperr_string(ypprot_err(error)));
193 * Check if NIS is up, so we can determine if to clear the map or not.
194 * Test it by checking the yp order.
195 * Returns: 0 if NIS is down, 1 if it is up.
198 nis_isup(mnt_map *m, char *map)
200 YP_ORDER_OUTORDER_TYPE order;
203 static int last_status = 1; /* assume up by default */
205 switch (has_yp_order) {
208 * NIS server with yp_order
210 error = yp_order(gopt.nis_domain, map, &order);
213 "nis_isup: error getting the order of map %s: %s",
214 map, yperr_string(ypprot_err(error)));
216 return 0; /* NIS is down */
222 * NIS+ server without yp_order
224 error = yp_master(gopt.nis_domain, map, &master);
227 "nis_isup: error getting the master of map %s: %s",
228 map, yperr_string(ypprot_err(error)));
230 return 0; /* NIS+ is down */
241 if (last_status == 0) { /* reinitialize if was down before */
243 error = nis_init(m, map, &dummy);
245 return 0; /* still down */
246 plog(XLOG_INFO, "nis_isup: NIS came back up for map %s", map);
249 return 1; /* NIS is up */
254 * Try to locate a key using NIS.
257 nis_search(mnt_map *m, char *map, char *key, char **val, time_t *tp)
261 YP_ORDER_OUTORDER_TYPE order;
264 * Make sure domain initialized
266 if (!gopt.nis_domain) {
267 int error = determine_nis_domain();
273 switch (has_yp_order) {
276 * NIS server with yp_order
277 * Check if map has changed
279 if (yp_order(gopt.nis_domain, map, &order))
281 if ((time_t) order > *tp) {
282 *tp = (time_t) order;
289 * NIS+ server without yp_order
290 * Check if timeout has expired to invalidate the cache
293 if ((time_t)order - *tp > gopt.am_timeo) {
303 if (nis_isup(m, map))
311 res = yp_match(gopt.nis_domain, map, key, strlen(key), val, &outlen);
314 * Do something interesting with the return code
324 plog(XLOG_ERROR, "%s: %s", map, yperr_string(res));
331 nis_init(mnt_map *m, char *map, time_t *tp)
333 YP_ORDER_OUTORDER_TYPE order;
337 if (!gopt.nis_domain) {
338 int error = determine_nis_domain();
344 * To see if the map exists, try to find
347 yp_order_result = yp_order(gopt.nis_domain, map, &order);
348 switch (yp_order_result) {
350 /* NIS server found */
352 *tp = (time_t) order;
354 dlog("NIS master for %s@%s has order %lu", map, gopt.nis_domain, (unsigned long) order);
358 /* NIS+ server found ! */
360 /* try yp_master() instead */
361 if (yp_master(gopt.nis_domain, map, &master)) {
365 dlog("NIS master for %s@%s is a NIS+ server", map, gopt.nis_domain);
367 /* Use fake timestamps */
381 nis_mtime(mnt_map *m, char *map, time_t *tp)
383 return nis_init(m, map, tp);
387 #ifdef HAVE_BAD_YP_ALL
389 * If you are using NIS and your yp_all function is "broken", use an
390 * alternate code which avoids a bug in yp_all(). The bug in yp_all() is
391 * that it does not close a TCP connection to ypserv, and this ypserv runs
392 * out of open filedescriptors, getting into an infinite loop, thus all YP
393 * clients eventually unbind and hang too.
395 * Systems known to be plagued with this bug:
397 * all irix systems (at this time, up to 6.4 was checked)
399 * -Erez Zadok <ezk@cs.columbia.edu>
400 * -James Tanis <jtt@cs.columbia.edu> */
402 am_yp_all(char *indomain, char *inmap, struct ypall_callback *incallback)
405 char *outkey, *outval;
406 int outkeylen, outvallen;
410 plog(XLOG_INFO, "NIS map %s reloading using am_yp_all", inmap);
412 i = yp_first(indomain, inmap, &outkey, &outkeylen, &outval, &outvallen);
414 plog(XLOG_ERROR, "yp_first() returned error: %s\n", yperr_string(i));
417 j = (incallback->foreach)(YP_TRUE,
423 if (j != FALSE) /* terminate loop */
427 * We have to manually free all char ** arguments to yp_first/yp_next
428 * outval must be freed *before* calling yp_next again, outkey can be
429 * freed as outkey_old *after* the call (this saves one call to
434 outkeylen_old = outkeylen;
435 i = yp_next(indomain,
447 dlog("yp_next() returned error: %s\n", yperr_string(i));
450 if (i == YPERR_NOMORE)
454 #endif /* HAVE_BAD_YP_ALL */