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;
117 ldb = ldb_module_get_ctx(module);
119 if (ldb->schema.attribute_handler_override) {
120 /* we skip loading the @ATTRIBUTES record when a module is supplying
121 its own attribute handling */
125 dn = ldb_dn_new(module, ldb, LTDB_ATTRIBUTES);
126 if (dn == NULL) goto failed;
128 r = ltdb_search_dn1(module, dn, msg);
130 if (r != LDB_SUCCESS && r != LDB_ERR_NO_SUCH_OBJECT) {
133 if (r == LDB_ERR_NO_SUCH_OBJECT) {
136 /* mapping these flags onto ldap 'syntaxes' isn't strictly correct,
137 but its close enough for now */
138 for (i=0;i<msg->num_elements;i++) {
141 const struct ldb_schema_syntax *s;
143 if (ltdb_attributes_flags(&msg->elements[i], &flags) != 0) {
144 ldb_debug(ldb, LDB_DEBUG_ERROR, "Invalid @ATTRIBUTES element for '%s'\n", msg->elements[i].name);
147 switch (flags & ~LTDB_FLAG_HIDDEN) {
149 syntax = LDB_SYNTAX_OCTET_STRING;
151 case LTDB_FLAG_CASE_INSENSITIVE:
152 syntax = LDB_SYNTAX_DIRECTORY_STRING;
154 case LTDB_FLAG_INTEGER:
155 syntax = LDB_SYNTAX_INTEGER;
158 ldb_debug(ldb, LDB_DEBUG_ERROR,
159 "Invalid flag combination 0x%x for '%s' in @ATTRIBUTES\n",
160 flags, msg->elements[i].name);
164 s = ldb_standard_syntax_by_name(ldb, syntax);
166 ldb_debug(ldb, LDB_DEBUG_ERROR,
167 "Invalid attribute syntax '%s' for '%s' in @ATTRIBUTES\n",
168 syntax, msg->elements[i].name);
172 flags |= LDB_ATTR_FLAG_ALLOCATED;
173 if (ldb_schema_attribute_add_with_syntax(ldb, msg->elements[i].name, flags, s) != 0) {
185 initialise the baseinfo record
187 static int ltdb_baseinfo_init(struct ldb_module *module)
189 struct ldb_context *ldb;
190 void *data = ldb_module_get_private(module);
191 struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
192 struct ldb_message *msg;
193 struct ldb_message_element el;
196 /* the initial sequence number must be different from the one
197 set in ltdb_cache_free(). Thanks to Jon for pointing this
199 const char *initial_sequence_number = "1";
201 ldb = ldb_module_get_ctx(module);
203 ltdb->sequence_number = atof(initial_sequence_number);
205 msg = talloc(ltdb, struct ldb_message);
210 msg->num_elements = 1;
212 msg->dn = ldb_dn_new(msg, ldb, LTDB_BASEINFO);
216 el.name = talloc_strdup(msg, LTDB_SEQUENCE_NUMBER);
223 val.data = (uint8_t *)talloc_strdup(msg, initial_sequence_number);
229 ret = ltdb_store(module, msg, TDB_INSERT);
238 return LDB_ERR_OPERATIONS_ERROR;
242 free any cache records
244 static void ltdb_cache_free(struct ldb_module *module)
246 void *data = ldb_module_get_private(module);
247 struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
249 ltdb->sequence_number = 0;
250 talloc_free(ltdb->cache);
257 int ltdb_cache_reload(struct ldb_module *module)
259 ltdb_attributes_unload(module);
260 ltdb_cache_free(module);
261 return ltdb_cache_load(module);
265 load the cache records
267 int ltdb_cache_load(struct ldb_module *module)
269 struct ldb_context *ldb;
270 void *data = ldb_module_get_private(module);
271 struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
272 struct ldb_dn *baseinfo_dn = NULL, *options_dn = NULL;
273 struct ldb_dn *indexlist_dn = NULL;
275 struct ldb_message *baseinfo = NULL, *options = NULL;
278 ldb = ldb_module_get_ctx(module);
280 /* a very fast check to avoid extra database reads */
281 if (ltdb->cache != NULL &&
282 tdb_get_seqnum(ltdb->tdb) == ltdb->tdb_seqnum) {
286 if (ltdb->cache == NULL) {
287 ltdb->cache = talloc_zero(ltdb, struct ltdb_cache);
288 if (ltdb->cache == NULL) goto failed;
289 ltdb->cache->indexlist = talloc_zero(ltdb->cache, struct ldb_message);
290 ltdb->cache->attributes = talloc_zero(ltdb->cache, struct ldb_message);
291 if (ltdb->cache->indexlist == NULL ||
292 ltdb->cache->attributes == NULL) {
297 baseinfo = talloc(ltdb->cache, struct ldb_message);
298 if (baseinfo == NULL) goto failed;
300 baseinfo_dn = ldb_dn_new(module, ldb, LTDB_BASEINFO);
301 if (baseinfo_dn == NULL) goto failed;
303 r= ltdb_search_dn1(module, baseinfo_dn, baseinfo);
304 if (r != LDB_SUCCESS && r != LDB_ERR_NO_SUCH_OBJECT) {
308 /* possibly initialise the baseinfo */
309 if (r == LDB_ERR_NO_SUCH_OBJECT) {
310 if (ltdb_baseinfo_init(module) != LDB_SUCCESS) {
313 if (ltdb_search_dn1(module, baseinfo_dn, baseinfo) != LDB_SUCCESS) {
318 ltdb->tdb_seqnum = tdb_get_seqnum(ltdb->tdb);
320 /* if the current internal sequence number is the same as the one
321 in the database then assume the rest of the cache is OK */
322 seq = ldb_msg_find_attr_as_uint64(baseinfo, LTDB_SEQUENCE_NUMBER, 0);
323 if (seq == ltdb->sequence_number) {
326 ltdb->sequence_number = seq;
328 /* Read an interpret database options */
329 options = talloc(ltdb->cache, struct ldb_message);
330 if (options == NULL) goto failed;
332 options_dn = ldb_dn_new(options, ldb, LTDB_OPTIONS);
333 if (options_dn == NULL) goto failed;
335 r= ltdb_search_dn1(module, options_dn, options);
336 if (r != LDB_SUCCESS && r != LDB_ERR_NO_SUCH_OBJECT) {
340 /* set flag for checking base DN on searches */
341 if (r == LDB_SUCCESS) {
342 ltdb->check_base = ldb_msg_find_attr_as_bool(options, LTDB_CHECK_BASE, false);
344 ltdb->check_base = false;
347 talloc_free(ltdb->cache->last_attribute.name);
348 memset(<db->cache->last_attribute, 0, sizeof(ltdb->cache->last_attribute));
350 ltdb_attributes_unload(module);
352 talloc_free(ltdb->cache->indexlist);
354 ltdb->cache->indexlist = talloc_zero(ltdb->cache, struct ldb_message);
355 ltdb->cache->attributes = talloc_zero(ltdb->cache, struct ldb_message);
356 if (ltdb->cache->indexlist == NULL ||
357 ltdb->cache->attributes == NULL) {
361 indexlist_dn = ldb_dn_new(module, ldb, LTDB_INDEXLIST);
362 if (indexlist_dn == NULL) goto failed;
364 r = ltdb_search_dn1(module, indexlist_dn, ltdb->cache->indexlist);
365 if (r != LDB_SUCCESS && r != LDB_ERR_NO_SUCH_OBJECT) {
369 if (ltdb_attributes_load(module) == -1) {
374 talloc_free(options);
375 talloc_free(baseinfo);
376 talloc_free(baseinfo_dn);
377 talloc_free(indexlist_dn);
381 talloc_free(options);
382 talloc_free(baseinfo);
383 talloc_free(baseinfo_dn);
384 talloc_free(indexlist_dn);
390 increase the sequence number to indicate a database change
392 int ltdb_increase_sequence_number(struct ldb_module *module)
394 struct ldb_context *ldb;
395 void *data = ldb_module_get_private(module);
396 struct ltdb_private *ltdb = talloc_get_type(data, struct ltdb_private);
397 struct ldb_message *msg;
398 struct ldb_message_element el[2];
400 struct ldb_val val_time;
401 time_t t = time(NULL);
405 ldb = ldb_module_get_ctx(module);
407 msg = talloc(ltdb, struct ldb_message);
410 return LDB_ERR_OPERATIONS_ERROR;
413 s = talloc_asprintf(msg, "%llu", ltdb->sequence_number+1);
416 return LDB_ERR_OPERATIONS_ERROR;
419 msg->num_elements = ARRAY_SIZE(el);
421 msg->dn = ldb_dn_new(msg, ldb, LTDB_BASEINFO);
422 if (msg->dn == NULL) {
425 return LDB_ERR_OPERATIONS_ERROR;
427 el[0].name = talloc_strdup(msg, LTDB_SEQUENCE_NUMBER);
428 if (el[0].name == NULL) {
431 return LDB_ERR_OPERATIONS_ERROR;
434 el[0].num_values = 1;
435 el[0].flags = LDB_FLAG_MOD_REPLACE;
436 val.data = (uint8_t *)s;
437 val.length = strlen(s);
439 el[1].name = talloc_strdup(msg, LTDB_MOD_TIMESTAMP);
440 if (el[1].name == NULL) {
443 return LDB_ERR_OPERATIONS_ERROR;
445 el[1].values = &val_time;
446 el[1].num_values = 1;
447 el[1].flags = LDB_FLAG_MOD_REPLACE;
449 s = ldb_timestring(msg, t);
451 return LDB_ERR_OPERATIONS_ERROR;
454 val_time.data = (uint8_t *)s;
455 val_time.length = strlen(s);
457 ret = ltdb_modify_internal(module, msg);
461 if (ret == LDB_SUCCESS) {
462 ltdb->sequence_number += 1;
465 /* updating the tdb_seqnum here avoids us reloading the cache
466 records due to our own modification */
467 ltdb->tdb_seqnum = tdb_get_seqnum(ltdb->tdb);
472 int ltdb_check_at_attributes_values(const struct ldb_val *value)
476 for (i = 0; ltdb_valid_attr_flags[i].name != NULL; i++) {
477 if ((strcmp(ltdb_valid_attr_flags[i].name, (char *)value->data) == 0)) {