5 Copyright (C) Simo Sorce 2004
7 ** NOTE! The following LGPL license applies to the ldb
8 ** library. This does NOT imply that all of Samba is released
11 This library is free software; you can redistribute it and/or
12 modify it under the terms of the GNU Lesser General Public
13 License as published by the Free Software Foundation; either
14 version 2 of the License, or (at your option) any later version.
16 This library is distributed in the hope that it will be useful,
17 but WITHOUT ANY WARRANTY; without even the implied warranty of
18 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 Lesser General Public License for more details.
21 You should have received a copy of the GNU Lesser General Public
22 License along with this library; if not, write to the Free Software
23 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
29 * Component: ldb modules core
31 * Description: core modules routines
37 #include "ldb/include/includes.h"
41 #include "dynconfig.h"
44 #define LDB_MODULE_PREFIX "modules:"
45 #define LDB_MODULE_PREFIX_LEN 8
47 static char *talloc_strdup_no_spaces(struct ldb_context *ldb, const char *string)
52 trimmed = talloc_strdup(ldb, string);
54 ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in talloc_strdup_trim_spaces()\n");
58 len = strlen(trimmed);
59 for (i = 0; trimmed[i] != '\0'; i++) {
64 memmove(&trimmed[i], &trimmed[i + 1], len -i -1);
73 /* modules are called in inverse order on the stack.
74 Lets place them as an admin would think the right order is.
75 Modules order is important */
76 static char **ldb_modules_list_from_string(struct ldb_context *ldb, const char *string)
78 char **modules = NULL;
82 /* spaces not admitted */
83 modstr = talloc_strdup_no_spaces(ldb, string);
88 modules = talloc_realloc(ldb, modules, char *, 2);
90 ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in ldb_modules_list_from_string()\n");
94 talloc_steal(modules, modstr);
97 while ((p = strrchr(modstr, ',')) != NULL) {
103 modules = talloc_realloc(ldb, modules, char *, i + 2);
105 ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in ldb_modules_list_from_string()\n");
112 modules[i + 1] = NULL;
117 static struct ops_list_entry {
118 const struct ldb_module_ops *ops;
119 struct ops_list_entry *next;
120 } *registered_modules = NULL;
122 static const struct ldb_module_ops *ldb_find_module_ops(const char *name)
124 struct ops_list_entry *e;
126 for (e = registered_modules; e; e = e->next) {
127 if (strcmp(e->ops->name, name) == 0)
135 #define LDAP_INIT ldb_ldap_init,
141 #define SQLITE3_INIT ldb_sqlite3_init,
146 #ifndef STATIC_ldb_MODULES
147 #define STATIC_ldb_MODULES \
153 ldb_operational_init, \
155 ldb_objectclass_init, \
156 ldb_paged_results_init, \
162 int ldb_global_init(void)
164 static int (*static_init_fns[])(void) = STATIC_ldb_MODULES;
166 static int initialized = 0;
174 for (i = 0; static_init_fns[i]; i++) {
175 if (static_init_fns[i]() == -1)
182 int ldb_register_module(const struct ldb_module_ops *ops)
184 struct ops_list_entry *entry = talloc(talloc_autofree_context(), struct ops_list_entry);
186 if (ldb_find_module_ops(ops->name) != NULL)
193 entry->next = registered_modules;
194 registered_modules = entry;
199 int ldb_try_load_dso(struct ldb_context *ldb, const char *name)
203 int (*init_fn) (void);
207 path = talloc_asprintf(ldb, "%s/ldb/%s.%s", dyn_MODULESDIR, name, dyn_SHLIBEXT);
209 path = talloc_asprintf(ldb, "%s/%s.%s", MODULESDIR, name, SHLIBEXT);
212 ldb_debug(ldb, LDB_DEBUG_TRACE, "trying to load %s from %s\n", name, path);
214 handle = dlopen(path, 0);
215 if (handle == NULL) {
216 ldb_debug(ldb, LDB_DEBUG_WARNING, "unable to load %s from %s: %s\n", name, path, dlerror());
220 init_fn = dlsym(handle, "init_module");
222 if (init_fn == NULL) {
223 ldb_debug(ldb, LDB_DEBUG_ERROR, "no symbol `init_module' found in %s: %s\n", path, dlerror());
231 ldb_debug(ldb, LDB_DEBUG_TRACE, "no dlopen() - not trying to load %s module\n", name);
236 int ldb_load_modules(struct ldb_context *ldb, const char *options[])
238 char **modules = NULL;
239 struct ldb_module *module;
241 /* find out which modules we are requested to activate */
243 /* check if we have a custom module list passd as ldb option */
245 for (i = 0; options[i] != NULL; i++) {
246 if (strncmp(options[i], LDB_MODULE_PREFIX, LDB_MODULE_PREFIX_LEN) == 0) {
247 modules = ldb_modules_list_from_string(ldb, &options[i][LDB_MODULE_PREFIX_LEN]);
252 /* if not overloaded by options and the backend is not ldap try to load the modules list from ldb */
253 if ((modules == NULL) && (strcmp("ldap", ldb->modules->ops->name) != 0)) {
255 const char * const attrs[] = { "@LIST" , NULL};
256 struct ldb_result *res = NULL;
259 mods = ldb_dn_explode(ldb, "@MODULES");
264 ret = ldb_search(ldb, mods, LDB_SCOPE_BASE, "", attrs, &res);
266 if (ret == LDB_SUCCESS && (res->count == 0 || res->msgs[0]->num_elements == 0)) {
267 ldb_debug(ldb, LDB_DEBUG_TRACE, "no modules required by the db\n");
269 if (ret != LDB_SUCCESS) {
270 ldb_debug(ldb, LDB_DEBUG_FATAL, "ldb error (%s) occurred searching for modules, bailing out\n", ldb_errstring(ldb));
273 if (res->count > 1) {
274 ldb_debug(ldb, LDB_DEBUG_FATAL, "Too many records found (%d), bailing out\n", res->count);
279 modules = ldb_modules_list_from_string(ldb,
280 (const char *)res->msgs[0]->elements[0].values[0].data);
287 if (modules != NULL) {
288 for (i = 0; modules[i] != NULL; i++) {
289 struct ldb_module *current;
290 const struct ldb_module_ops *ops;
292 ops = ldb_find_module_ops(modules[i]);
294 if (ldb_try_load_dso(ldb, modules[i]) == 0) {
295 ops = ldb_find_module_ops(modules[i]);
300 ldb_debug(ldb, LDB_DEBUG_WARNING, "WARNING: Module [%s] not found\n",
305 current = talloc_zero(ldb, struct ldb_module);
306 if (current == NULL) {
313 DLIST_ADD(ldb->modules, current);
316 talloc_free(modules);
318 ldb_debug(ldb, LDB_DEBUG_TRACE, "No modules specified for this database\n");
321 module = ldb->modules;
323 while (module && module->ops->init_context == NULL)
324 module = module->next;
326 if (module && module->ops->init_context &&
327 module->ops->init_context(module) != LDB_SUCCESS) {
328 ldb_debug(ldb, LDB_DEBUG_FATAL, "module initialization failed\n");
336 by using this we allow ldb modules to only implement the functions they care about,
337 which makes writing a module simpler, and makes it more likely to keep working
340 #define FIND_OP(module, op) do { \
341 module = module->next; \
342 while (module && module->ops->op == NULL) module = module->next; \
343 if (module == NULL) return LDB_ERR_OPERATIONS_ERROR; \
348 helper functions to call the next module in chain
351 int ldb_next_request(struct ldb_module *module, struct ldb_request *request)
353 switch (request->operation) {
355 FIND_OP(module, search);
356 return module->ops->search(module, request);
358 FIND_OP(module, add);
359 return module->ops->add(module, request);
361 FIND_OP(module, modify);
362 return module->ops->modify(module, request);
364 FIND_OP(module, del);
365 return module->ops->del(module, request);
367 FIND_OP(module, rename);
368 return module->ops->rename(module, request);
370 FIND_OP(module, request);
371 return module->ops->request(module, request);
375 int ldb_next_init(struct ldb_module *module)
377 /* init is different in that it is not an error if modules
378 * do not require initialization */
380 module = module->next;
382 while (module && module->ops->init_context == NULL)
383 module = module->next;
388 return module->ops->init_context(module);
391 int ldb_next_start_trans(struct ldb_module *module)
393 FIND_OP(module, start_transaction);
394 return module->ops->start_transaction(module);
397 int ldb_next_end_trans(struct ldb_module *module)
399 FIND_OP(module, end_transaction);
400 return module->ops->end_transaction(module);
403 int ldb_next_del_trans(struct ldb_module *module)
405 FIND_OP(module, del_transaction);
406 return module->ops->del_transaction(module);