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"
39 #define LDB_MODULE_PREFIX "modules:"
40 #define LDB_MODULE_PREFIX_LEN 8
42 static char *talloc_strdup_no_spaces(struct ldb_context *ldb, const char *string)
47 trimmed = talloc_strdup(ldb, string);
49 ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in talloc_strdup_trim_spaces()\n");
53 len = strlen(trimmed);
54 for (i = 0; trimmed[i] != '\0'; i++) {
59 memmove(&trimmed[i], &trimmed[i + 1], len -i -1);
68 /* modules are called in inverse order on the stack.
69 Lets place them as an admin would think the right order is.
70 Modules order is imprtant */
71 static char **ldb_modules_list_from_string(struct ldb_context *ldb, const char *string)
73 char **modules = NULL;
77 /* spaces not admitted */
78 modstr = talloc_strdup_no_spaces(ldb, string);
83 modules = talloc_realloc(ldb, modules, char *, 2);
85 ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in ldb_modules_list_from_string()\n");
89 talloc_steal(modules, modstr);
92 while ((p = strrchr(modstr, ',')) != NULL) {
98 modules = talloc_realloc(ldb, modules, char *, i + 2);
100 ldb_debug(ldb, LDB_DEBUG_FATAL, "Out of Memory in ldb_modules_list_from_string()\n");
107 modules[i + 1] = NULL;
112 int ldb_load_modules(struct ldb_context *ldb, const char *options[])
114 char **modules = NULL;
118 ldb_module_init_t init;
119 } well_known_modules[] = {
120 { "schema", schema_module_init },
121 { "operational", operational_module_init },
122 { "rdn_name", rdn_name_module_init },
123 { "objectclass", objectclass_module_init },
124 { "paged_results", paged_results_module_init },
125 { "server_sort", server_sort_module_init },
127 { "objectguid", objectguid_module_init },
128 { "samldb", samldb_module_init },
129 { "samba3sam", ldb_samba3sam_module_init },
130 { "proxy", proxy_module_init },
131 { "rootdse", rootdse_module_init },
132 { "extended_dn", extended_dn_module_init },
133 { "password_hash", password_hash_module_init },
134 { "kludge_acl", kludge_acl_module_init },
139 /* find out which modules we are requested to activate */
141 /* check if we have a custom module list passd as ldb option */
143 for (i = 0; options[i] != NULL; i++) {
144 if (strncmp(options[i], LDB_MODULE_PREFIX, LDB_MODULE_PREFIX_LEN) == 0) {
145 modules = ldb_modules_list_from_string(ldb, &options[i][LDB_MODULE_PREFIX_LEN]);
150 /* if not overloaded by options and the backend is not ldap try to load the modules list form ldb */
151 if ((modules == NULL) && (strcmp("ldap", ldb->modules->ops->name) != 0)) {
153 const char * const attrs[] = { "@LIST" , NULL};
154 struct ldb_result *res = NULL;
157 mods = ldb_dn_explode(ldb, "@MODULES");
162 ret = ldb_search(ldb, mods, LDB_SCOPE_BASE, "", attrs, &res);
164 if (ret == LDB_SUCCESS && (res->count == 0 || res->msgs[0]->num_elements == 0)) {
165 ldb_debug(ldb, LDB_DEBUG_TRACE, "no modules required by the db\n");
167 if (ret != LDB_SUCCESS) {
168 ldb_debug(ldb, LDB_DEBUG_FATAL, "ldb error (%s) occurred searching for modules, bailing out\n", ldb_errstring(ldb));
171 if (res->count > 1) {
172 ldb_debug(ldb, LDB_DEBUG_FATAL, "Too many records found (%d), bailing out\n", res->count);
177 modules = ldb_modules_list_from_string(ldb,
178 (const char *)res->msgs[0]->elements[0].values[0].data);
185 if (modules == NULL) {
186 ldb_debug(ldb, LDB_DEBUG_TRACE, "No modules specified for this database\n");
190 for (i = 0; modules[i] != NULL; i++) {
191 struct ldb_module *current;
193 for (m=0;well_known_modules[m].name;m++) {
194 if (strcmp(modules[i], well_known_modules[m].name) == 0) {
195 current = well_known_modules[m].init(ldb, options);
196 if (current == NULL) {
197 ldb_debug(ldb, LDB_DEBUG_FATAL, "function 'init_module' in %s fails\n", modules[i]);
200 DLIST_ADD(ldb->modules, current);
204 if (well_known_modules[m].name == NULL) {
205 ldb_debug(ldb, LDB_DEBUG_WARNING, "WARNING: Module [%s] not found\n",
210 /* second stage init */
211 if (ldb_second_stage_init(ldb) != LDB_SUCCESS) {
212 ldb_debug(ldb, LDB_DEBUG_ERROR, "ERROR: Second stage init failed!\n");
216 talloc_free(modules);
221 by using this we allow ldb modules to only implement the functions they care about,
222 which makes writing a module simpler, and makes it more likely to keep working
225 #define FIND_OP(module, op) do { \
226 module = module->next; \
227 while (module && module->ops->op == NULL) module = module->next; \
228 if (module == NULL) return LDB_ERR_OTHER; \
233 helper functions to call the next module in chain
235 int ldb_next_request(struct ldb_module *module, struct ldb_request *request)
237 FIND_OP(module, request);
238 return module->ops->request(module, request);
241 int ldb_next_second_stage_init(struct ldb_module *module)
243 FIND_OP(module, second_stage_init);
244 return module->ops->second_stage_init(module);
247 int ldb_next_start_trans(struct ldb_module *module)
249 FIND_OP(module, start_transaction);
250 return module->ops->start_transaction(module);
253 int ldb_next_end_trans(struct ldb_module *module)
255 FIND_OP(module, end_transaction);
256 return module->ops->end_transaction(module);
259 int ldb_next_del_trans(struct ldb_module *module)
261 FIND_OP(module, del_transaction);
262 return module->ops->del_transaction(module);
265 void ldb_set_errstring(struct ldb_module *module, char *err_string)
267 if (module->ldb->err_string) {
268 talloc_free(module->ldb->err_string);
271 module->ldb->err_string = talloc_steal(module->ldb, err_string);