4 Copyright (C) Andrew Tridgell 2004
6 ** NOTE! The following LGPL license applies to the ldb
7 ** library. This does NOT imply that all of Samba is released
10 This library is free software; you can redistribute it and/or
11 modify it under the terms of the GNU Lesser General Public
12 License as published by the Free Software Foundation; either
13 version 3 of the License, or (at your option) any later version.
15 This library is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public
21 License along with this library; if not, see <http://www.gnu.org/licenses/>.
27 * Component: ldb tdb cache functions
29 * Description: cache special records in a ldb/tdb
31 * Author: Andrew Tridgell
35 #include "ldb_private.h"
37 #define LTDB_FLAG_CASE_INSENSITIVE (1<<0)
38 #define LTDB_FLAG_INTEGER (1<<1)
39 #define LTDB_FLAG_HIDDEN (1<<2)
41 /* valid attribute flags */
45 } ltdb_valid_attr_flags[] = {
46 { "CASE_INSENSITIVE", LTDB_FLAG_CASE_INSENSITIVE },
47 { "INTEGER", LTDB_FLAG_INTEGER },
48 { "HIDDEN", LTDB_FLAG_HIDDEN },
55 de-register any special handlers for @ATTRIBUTES
57 static void ltdb_attributes_unload(struct ldb_module *module)
59 struct ldb_context *ldb;
60 void *data = ldb_module_get_private(module);
61 struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
62 struct ldb_message *msg;
65 ldb = ldb_module_get_ctx(module);
67 if (ltdb->cache->attributes == NULL) {
68 /* no previously loaded attributes */
72 msg = ltdb->cache->attributes;
73 for (i=0;i<msg->num_elements;i++) {
74 ldb_schema_attribute_remove(ldb, msg->elements[i].name);
77 talloc_free(ltdb->cache->attributes);
78 ltdb->cache->attributes = NULL;
82 add up the attrib flags for a @ATTRIBUTES element
84 static int ltdb_attributes_flags(struct ldb_message_element *el, unsigned *v)
88 for (i=0;i<el->num_values;i++) {
90 for (j=0;ltdb_valid_attr_flags[j].name;j++) {
91 if (strcmp(ltdb_valid_attr_flags[j].name,
92 (char *)el->values[i].data) == 0) {
93 value |= ltdb_valid_attr_flags[j].value;
97 if (ltdb_valid_attr_flags[j].name == NULL) {
106 register any special handlers from @ATTRIBUTES
108 static int ltdb_attributes_load(struct ldb_module *module)
110 struct ldb_context *ldb;
111 void *data = ldb_module_get_private(module);
112 struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
113 struct ldb_message *msg = ltdb->cache->attributes;
118 ldb = ldb_module_get_ctx(module);
120 if (ldb->schema.attribute_handler_override) {
121 /* we skip loading the @ATTRIBUTES record when a module is supplying
122 its own attribute handling */
126 dn = ldb_dn_new(module, ldb, LTDB_ATTRIBUTES);
127 if (dn == NULL) goto failed;
129 r = ltdb_search_dn1(module, dn, msg, 0);
131 if (r != LDB_SUCCESS && r != LDB_ERR_NO_SUCH_OBJECT) {
134 if (r == LDB_ERR_NO_SUCH_OBJECT) {
137 /* mapping these flags onto ldap 'syntaxes' isn't strictly correct,
138 but its close enough for now */
139 for (i=0;i<msg->num_elements;i++) {
142 const struct ldb_schema_syntax *s;
144 if (ltdb_attributes_flags(&msg->elements[i], &flags) != 0) {
145 ldb_debug(ldb, LDB_DEBUG_ERROR, "Invalid @ATTRIBUTES element for '%s'", msg->elements[i].name);
148 switch (flags & ~LTDB_FLAG_HIDDEN) {
150 syntax = LDB_SYNTAX_OCTET_STRING;
152 case LTDB_FLAG_CASE_INSENSITIVE:
153 syntax = LDB_SYNTAX_DIRECTORY_STRING;
155 case LTDB_FLAG_INTEGER:
156 syntax = LDB_SYNTAX_INTEGER;
159 ldb_debug(ldb, LDB_DEBUG_ERROR,
160 "Invalid flag combination 0x%x for '%s' in @ATTRIBUTES",
161 flags, msg->elements[i].name);
165 s = ldb_standard_syntax_by_name(ldb, syntax);
167 ldb_debug(ldb, LDB_DEBUG_ERROR,
168 "Invalid attribute syntax '%s' for '%s' in @ATTRIBUTES",
169 syntax, msg->elements[i].name);
173 flags |= LDB_ATTR_FLAG_ALLOCATED;
174 if (ldb_schema_attribute_add_with_syntax(ldb, msg->elements[i].name, flags, s) != 0) {
186 initialise the baseinfo record
188 static int ltdb_baseinfo_init(struct ldb_module *module)
190 struct ldb_context *ldb;
191 void *data = ldb_module_get_private(module);
192 struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
193 struct ldb_message *msg;
194 struct ldb_message_element el;
197 /* the initial sequence number must be different from the one
198 set in ltdb_cache_free(). Thanks to Jon for pointing this
200 const char *initial_sequence_number = "1";
202 ldb = ldb_module_get_ctx(module);
204 ltdb->sequence_number = atof(initial_sequence_number);
206 msg = ldb_msg_new(ltdb);
211 msg->num_elements = 1;
213 msg->dn = ldb_dn_new(msg, ldb, LTDB_BASEINFO);
217 el.name = talloc_strdup(msg, LTDB_SEQUENCE_NUMBER);
224 val.data = (uint8_t *)talloc_strdup(msg, initial_sequence_number);
230 ret = ltdb_store(module, msg, TDB_INSERT);
239 return LDB_ERR_OPERATIONS_ERROR;
243 free any cache records
245 static void ltdb_cache_free(struct ldb_module *module)
247 void *data = ldb_module_get_private(module);
248 struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
250 ltdb->sequence_number = 0;
251 talloc_free(ltdb->cache);
258 int ltdb_cache_reload(struct ldb_module *module)
260 ltdb_attributes_unload(module);
261 ltdb_cache_free(module);
262 return ltdb_cache_load(module);
266 load the cache records
268 int ltdb_cache_load(struct ldb_module *module)
270 struct ldb_context *ldb;
271 void *data = ldb_module_get_private(module);
272 struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
273 struct ldb_dn *baseinfo_dn = NULL, *options_dn = NULL;
274 struct ldb_dn *indexlist_dn = NULL;
276 struct ldb_message *baseinfo = NULL, *options = NULL;
279 ldb = ldb_module_get_ctx(module);
281 /* a very fast check to avoid extra database reads */
282 if (ltdb->cache != NULL &&
283 tdb_get_seqnum(ltdb->tdb) == ltdb->tdb_seqnum) {
287 if (ltdb->cache == NULL) {
288 ltdb->cache = talloc_zero(ltdb, struct ltdb_cache);
289 if (ltdb->cache == NULL) goto failed;
290 ltdb->cache->indexlist = ldb_msg_new(ltdb->cache);
291 ltdb->cache->attributes = ldb_msg_new(ltdb->cache);
292 if (ltdb->cache->indexlist == NULL ||
293 ltdb->cache->attributes == NULL) {
298 baseinfo = ldb_msg_new(ltdb->cache);
299 if (baseinfo == NULL) goto failed;
301 baseinfo_dn = ldb_dn_new(baseinfo, ldb, LTDB_BASEINFO);
302 if (baseinfo_dn == NULL) goto failed;
304 r= ltdb_search_dn1(module, baseinfo_dn, baseinfo, 0);
305 if (r != LDB_SUCCESS && r != LDB_ERR_NO_SUCH_OBJECT) {
309 /* possibly initialise the baseinfo */
310 if (r == LDB_ERR_NO_SUCH_OBJECT) {
312 if (tdb_transaction_start(ltdb->tdb) != 0) {
316 /* error handling for ltdb_baseinfo_init() is by
317 looking for the record again. */
318 ltdb_baseinfo_init(module);
320 tdb_transaction_commit(ltdb->tdb);
322 if (ltdb_search_dn1(module, baseinfo_dn, baseinfo, 0) != LDB_SUCCESS) {
327 ltdb->tdb_seqnum = tdb_get_seqnum(ltdb->tdb);
329 /* if the current internal sequence number is the same as the one
330 in the database then assume the rest of the cache is OK */
331 seq = ldb_msg_find_attr_as_uint64(baseinfo, LTDB_SEQUENCE_NUMBER, 0);
332 if (seq == ltdb->sequence_number) {
335 ltdb->sequence_number = seq;
337 /* Read an interpret database options */
338 options = ldb_msg_new(ltdb->cache);
339 if (options == NULL) goto failed;
341 options_dn = ldb_dn_new(options, ldb, LTDB_OPTIONS);
342 if (options_dn == NULL) goto failed;
344 r= ltdb_search_dn1(module, options_dn, options, 0);
345 if (r != LDB_SUCCESS && r != LDB_ERR_NO_SUCH_OBJECT) {
349 /* set flags if they do exist */
350 if (r == LDB_SUCCESS) {
351 ltdb->check_base = ldb_msg_find_attr_as_bool(options,
354 ltdb->disallow_dn_filter = ldb_msg_find_attr_as_bool(options,
355 LTDB_DISALLOW_DN_FILTER,
358 ltdb->check_base = false;
359 ltdb->disallow_dn_filter = false;
362 talloc_free(ltdb->cache->indexlist);
363 ltdb_attributes_unload(module); /* calls internally "talloc_free" */
365 ltdb->cache->indexlist = ldb_msg_new(ltdb->cache);
366 ltdb->cache->attributes = ldb_msg_new(ltdb->cache);
367 if (ltdb->cache->indexlist == NULL ||
368 ltdb->cache->attributes == NULL) {
371 ltdb->cache->one_level_indexes = false;
372 ltdb->cache->attribute_indexes = false;
374 indexlist_dn = ldb_dn_new(module, ldb, LTDB_INDEXLIST);
375 if (indexlist_dn == NULL) goto failed;
377 r = ltdb_search_dn1(module, indexlist_dn, ltdb->cache->indexlist, 0);
378 if (r != LDB_SUCCESS && r != LDB_ERR_NO_SUCH_OBJECT) {
382 if (ldb_msg_find_element(ltdb->cache->indexlist, LTDB_IDXONE) != NULL) {
383 ltdb->cache->one_level_indexes = true;
385 if (ldb_msg_find_element(ltdb->cache->indexlist, LTDB_IDXATTR) != NULL) {
386 ltdb->cache->attribute_indexes = true;
389 if (ltdb_attributes_load(module) == -1) {
394 talloc_free(options);
395 talloc_free(baseinfo);
396 talloc_free(indexlist_dn);
400 talloc_free(options);
401 talloc_free(baseinfo);
402 talloc_free(indexlist_dn);
408 increase the sequence number to indicate a database change
410 int ltdb_increase_sequence_number(struct ldb_module *module)
412 struct ldb_context *ldb;
413 void *data = ldb_module_get_private(module);
414 struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
415 struct ldb_message *msg;
416 struct ldb_message_element el[2];
418 struct ldb_val val_time;
419 time_t t = time(NULL);
423 ldb = ldb_module_get_ctx(module);
425 msg = ldb_msg_new(ltdb);
428 return LDB_ERR_OPERATIONS_ERROR;
431 s = talloc_asprintf(msg, "%llu", ltdb->sequence_number+1);
435 return LDB_ERR_OPERATIONS_ERROR;
438 msg->num_elements = ARRAY_SIZE(el);
440 msg->dn = ldb_dn_new(msg, ldb, LTDB_BASEINFO);
441 if (msg->dn == NULL) {
444 return LDB_ERR_OPERATIONS_ERROR;
446 el[0].name = talloc_strdup(msg, LTDB_SEQUENCE_NUMBER);
447 if (el[0].name == NULL) {
450 return LDB_ERR_OPERATIONS_ERROR;
453 el[0].num_values = 1;
454 el[0].flags = LDB_FLAG_MOD_REPLACE;
455 val.data = (uint8_t *)s;
456 val.length = strlen(s);
458 el[1].name = talloc_strdup(msg, LTDB_MOD_TIMESTAMP);
459 if (el[1].name == NULL) {
462 return LDB_ERR_OPERATIONS_ERROR;
464 el[1].values = &val_time;
465 el[1].num_values = 1;
466 el[1].flags = LDB_FLAG_MOD_REPLACE;
468 s = ldb_timestring(msg, t);
471 return LDB_ERR_OPERATIONS_ERROR;
474 val_time.data = (uint8_t *)s;
475 val_time.length = strlen(s);
477 ret = ltdb_modify_internal(module, msg, NULL);
481 if (ret == LDB_SUCCESS) {
482 ltdb->sequence_number += 1;
485 /* updating the tdb_seqnum here avoids us reloading the cache
486 records due to our own modification */
487 ltdb->tdb_seqnum = tdb_get_seqnum(ltdb->tdb);
492 int ltdb_check_at_attributes_values(const struct ldb_val *value)
496 for (i = 0; ltdb_valid_attr_flags[i].name != NULL; i++) {
497 if ((strcmp(ltdb_valid_attr_flags[i].name, (char *)value->data) == 0)) {