2 * Copyright (c) 1997-2006 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
40 * File: am-utils/amd/info_nis.c
45 * Get info from NIS map
50 #endif /* HAVE_CONFIG_H */
56 * NIS+ servers in NIS compat mode don't have yp_order()
58 * has_yp_order = 1 NIS server
62 static int has_yp_order = -1;
64 /* forward declarations */
65 int nis_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *));
66 int nis_search(mnt_map *m, char *map, char *key, char **val, time_t *tp);
67 int nis_init(mnt_map *m, char *map, time_t *tp);
68 int nis_isup(mnt_map *m, char *map);
69 int nis_mtime(mnt_map *m, char *map, time_t *tp);
72 typedef void (*nis_callback_fxn_t)(mnt_map *, char *, char *);
73 #ifndef DEFINED_YPALL_CALLBACK_FXN_T
74 typedef int (*ypall_callback_fxn_t)();
75 #endif /* DEFINED_YPALL_CALLBACK_FXN_T */
77 struct nis_callback_data {
80 nis_callback_fxn_t ncd_fn;
83 /* Map to the right version of yp_all */
84 #ifdef HAVE_BAD_YP_ALL
85 # define yp_all am_yp_all
86 static int am_yp_all(char *indomain, char *inmap, struct ypall_callback *incallback);
87 #endif /* HAVE_BAD_YP_ALL */
91 * Figure out the nis domain name
94 determine_nis_domain(void)
96 static int nis_not_running = 0;
97 char default_domain[YPMAXDOMAIN];
102 if (getdomainname(default_domain, sizeof(default_domain)) < 0) {
104 plog(XLOG_ERROR, "getdomainname: %m");
107 if (!*default_domain) {
109 plog(XLOG_WARNING, "NIS domain name is not set. NIS ignored.");
112 gopt.nis_domain = strdup(default_domain);
119 * Callback from yp_all
122 callback(int status, char *key, int kl, char *val, int vl, char *data)
124 struct nis_callback_data *ncdp = (struct nis_callback_data *) data;
126 if (status == YP_TRUE) {
128 /* add to list of maps */
129 char *kp = strnsave(key, kl);
130 char *vp = strnsave(val, vl);
132 (*ncdp->ncd_fn) (ncdp->ncd_m, kp, vp);
134 /* we want more ... */
139 /* NOMORE means end of map - otherwise log error */
140 if (status != YP_NOMORE) {
141 /* check what went wrong */
142 int e = ypprot_err(status);
144 plog(XLOG_ERROR, "yp enumeration of %s: %s, status=%d, e=%d",
145 ncdp->ncd_map, yperr_string(e), status, e);
153 nis_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *))
156 struct nis_callback_data data;
157 struct ypall_callback cbinfo;
159 if (!gopt.nis_domain) {
160 error = determine_nis_domain();
167 cbinfo.data = (voidp) &data;
168 cbinfo.foreach = (ypall_callback_fxn_t) callback;
171 * If you are using NIS and your yp_all function is "broken", you have to
172 * get it fixed. The bug in yp_all() is that it does not close a TCP
173 * connection to ypserv, and this ypserv runs out of open file descriptors,
174 * getting into an infinite loop, thus all YP clients eventually unbind
177 error = yp_all(gopt.nis_domain, map, &cbinfo);
180 plog(XLOG_ERROR, "error grabbing nis map of %s: %s", map, yperr_string(ypprot_err(error)));
186 * Check if NIS is up, so we can determine if to clear the map or not.
187 * Test it by checking the yp order.
188 * Returns: 0 if NIS is down, 1 if it is up.
191 nis_isup(mnt_map *m, char *map)
193 YP_ORDER_OUTORDER_TYPE order;
196 static int last_status = 1; /* assume up by default */
198 switch (has_yp_order) {
201 * NIS server with yp_order
203 error = yp_order(gopt.nis_domain, map, &order);
206 "nis_isup: error getting the order of map %s: %s",
207 map, yperr_string(ypprot_err(error)));
209 return 0; /* NIS is down */
215 * NIS+ server without yp_order
217 error = yp_master(gopt.nis_domain, map, &master);
220 "nis_isup: error getting the master of map %s: %s",
221 map, yperr_string(ypprot_err(error)));
223 return 0; /* NIS+ is down */
234 if (last_status == 0) { /* reinitialize if was down before */
236 error = nis_init(m, map, &dummy);
238 return 0; /* still down */
239 plog(XLOG_INFO, "nis_isup: NIS came back up for map %s", map);
242 return 1; /* NIS is up */
247 * Try to locate a key using NIS.
250 nis_search(mnt_map *m, char *map, char *key, char **val, time_t *tp)
254 YP_ORDER_OUTORDER_TYPE order;
257 * Make sure domain initialized
259 if (!gopt.nis_domain) {
260 int error = determine_nis_domain();
266 switch (has_yp_order) {
269 * NIS server with yp_order
270 * Check if map has changed
272 if (yp_order(gopt.nis_domain, map, &order))
274 if ((time_t) order > *tp) {
275 *tp = (time_t) order;
282 * NIS+ server without yp_order
283 * Check if timeout has expired to invalidate the cache
286 if ((time_t)order - *tp > gopt.am_timeo) {
296 if (nis_isup(m, map))
304 res = yp_match(gopt.nis_domain, map, key, strlen(key), val, &outlen);
307 * Do something interesting with the return code
317 plog(XLOG_ERROR, "nis_search: %s: %s", map, yperr_string(res));
324 nis_init(mnt_map *m, char *map, time_t *tp)
326 YP_ORDER_OUTORDER_TYPE order;
330 if (!gopt.nis_domain) {
331 int error = determine_nis_domain();
337 * To see if the map exists, try to find
340 yp_order_result = yp_order(gopt.nis_domain, map, &order);
341 switch (yp_order_result) {
343 /* NIS server found */
345 *tp = (time_t) order;
346 dlog("NIS master for %s@%s has order %lu", map, gopt.nis_domain, (unsigned long) order);
349 /* NIS+ server found ! */
351 /* try yp_master() instead */
352 if (yp_master(gopt.nis_domain, map, &master)) {
355 dlog("NIS master for %s@%s is a NIS+ server", map, gopt.nis_domain);
356 /* Use fake timestamps */
370 nis_mtime(mnt_map *m, char *map, time_t *tp)
372 return nis_init(m, map, tp);
376 #ifdef HAVE_BAD_YP_ALL
378 * If you are using NIS and your yp_all function is "broken", use an
379 * alternate code which avoids a bug in yp_all(). The bug in yp_all() is
380 * that it does not close a TCP connection to ypserv, and this ypserv runs
381 * out of open filedescriptors, getting into an infinite loop, thus all YP
382 * clients eventually unbind and hang too.
384 * Systems known to be plagued with this bug:
386 * all irix systems (at this time, up to 6.4 was checked)
388 * -Erez Zadok <ezk@cs.columbia.edu>
389 * -James Tanis <jtt@cs.columbia.edu> */
391 am_yp_all(char *indomain, char *inmap, struct ypall_callback *incallback)
394 char *outkey, *outval;
395 int outkeylen, outvallen;
399 plog(XLOG_INFO, "NIS map %s reloading using am_yp_all", inmap);
401 i = yp_first(indomain, inmap, &outkey, &outkeylen, &outval, &outvallen);
403 plog(XLOG_ERROR, "yp_first() returned error: %s\n", yperr_string(i));
406 j = (incallback->foreach)(YP_TRUE,
412 if (j != FALSE) /* terminate loop */
416 * We have to manually free all char ** arguments to yp_first/yp_next
417 * outval must be freed *before* calling yp_next again, outkey can be
418 * freed as outkey_old *after* the call (this saves one call to
423 outkeylen_old = outkeylen;
424 i = yp_next(indomain,
435 dlog("yp_next() returned error: %s\n", yperr_string(i));
437 if (i == YPERR_NOMORE)
441 #endif /* HAVE_BAD_YP_ALL */