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 2 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, write to the Free Software
22 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 * Component: ldb core API
30 * Description: core API routines interfacing to ldb backends
32 * Author: Andrew Tridgell
36 #include "ldb/include/ldb.h"
37 #include "ldb/include/ldb_errors.h"
38 #include "ldb/include/ldb_private.h"
41 initialise a ldb context
42 The mem_ctx is optional
44 struct ldb_context *ldb_init(void *mem_ctx)
46 struct ldb_context *ldb = talloc_zero(mem_ctx, struct ldb_context);
49 ret = ldb_setup_wellknown_attributes(ldb);
59 connect to a database. The URL can either be one of the following forms
63 flags is made up of LDB_FLG_*
65 the options are passed uninterpreted to the backend, and are
68 int ldb_connect(struct ldb_context *ldb, const char *url, unsigned int flags, const char *options[])
72 if (strncmp(url, "tdb:", 4) == 0 ||
73 strchr(url, ':') == NULL) {
74 ret = ltdb_connect(ldb, url, flags, options);
78 else if (strncmp(url, "ldap", 4) == 0) {
79 ret = ildb_connect(ldb, url, flags, options);
82 else if (strncmp(url, "ldap", 4) == 0) {
83 ret = lldb_connect(ldb, url, flags, options);
87 else if (strncmp(url, "sqlite:", 7) == 0) {
88 ret = lsqlite3_connect(ldb, url, flags, options);
92 ldb_debug(ldb, LDB_DEBUG_FATAL, "Unable to find backend for '%s'\n", url);
96 if (ret != LDB_SUCCESS) {
97 ldb_debug(ldb, LDB_DEBUG_ERROR, "Failed to connect to '%s'\n", url);
101 if (ldb_load_modules(ldb, options) != LDB_SUCCESS) {
102 ldb_debug(ldb, LDB_DEBUG_FATAL, "Unable to load modules for '%s'\n", url);
103 return LDB_ERR_OTHER;
109 static void ldb_reset_err_string(struct ldb_context *ldb)
111 if (ldb->err_string) {
112 talloc_free(ldb->err_string);
113 ldb->err_string = NULL;
117 #define FIRST_OP(ldb, op) do { \
118 module = ldb->modules; \
119 while (module && module->ops->op == NULL) module = module->next; \
120 if (module == NULL) return -1; \
126 int ldb_transaction_start(struct ldb_context *ldb)
128 struct ldb_module *module;
129 FIRST_OP(ldb, start_transaction);
131 ldb->transaction_active++;
133 ldb_reset_err_string(ldb);
135 return module->ops->start_transaction(module);
141 int ldb_transaction_commit(struct ldb_context *ldb)
143 struct ldb_module *module;
144 FIRST_OP(ldb, end_transaction);
146 if (ldb->transaction_active > 0) {
147 ldb->transaction_active--;
149 return LDB_ERR_OPERATIONS_ERROR;
152 ldb_reset_err_string(ldb);
154 return module->ops->end_transaction(module);
160 int ldb_transaction_cancel(struct ldb_context *ldb)
162 struct ldb_module *module;
163 FIRST_OP(ldb, del_transaction);
165 if (ldb->transaction_active > 0) {
166 ldb->transaction_active--;
168 return LDB_ERR_OPERATIONS_ERROR;
171 return module->ops->del_transaction(module);
175 check for an error return from an op
176 if an op fails, but has not setup an error string, then setup one now
178 static int ldb_op_finish(struct ldb_context *ldb, int status)
180 if (status == LDB_SUCCESS) {
181 return ldb_transaction_commit(ldb);
183 if (ldb->err_string == NULL) {
184 /* no error string was setup by the backend */
185 ldb_set_errstring(ldb->modules,
186 talloc_asprintf(ldb, "ldb error %d", status));
188 ldb_transaction_cancel(ldb);
194 autostarts a transacion if none active and the operation is not a search
195 returns LDB_ERR_* on errors.
197 int ldb_request(struct ldb_context *ldb, struct ldb_request *request)
199 int status, started_transaction=0;
200 struct ldb_request *r;
202 ldb_reset_err_string(ldb);
204 /* to allow ldb modules to assume they can use the request ptr
205 as a talloc context for the request, we have to copy the
207 r = talloc(ldb, struct ldb_request);
210 return LDB_ERR_OPERATIONS_ERROR;
215 if (r->operation == LDB_REQ_SEARCH) {
216 r->op.search.res = NULL;
219 /* start a transaction if needed */
220 if ((!ldb->transaction_active) &&
221 (request->operation == LDB_REQ_ADD ||
222 request->operation == LDB_REQ_MODIFY ||
223 request->operation == LDB_REQ_DELETE ||
224 request->operation == LDB_REQ_RENAME)) {
225 status = ldb_transaction_start(ldb);
226 if (status != LDB_SUCCESS) {
230 started_transaction = 1;
233 /* call the first module in the chain */
234 status = ldb->modules->ops->request(ldb->modules, r);
236 /* the search call is the only one that returns something
237 other than a status code. We steal the results into
238 the context of the ldb before freeing the request */
239 if (request->operation == LDB_REQ_SEARCH) {
240 request->op.search.res = talloc_steal(ldb, r->op.search.res);
244 if (started_transaction) {
245 return ldb_op_finish(ldb, status);
252 search the database given a LDAP-like search expression
254 return the number of records found, or -1 on error
256 Use talloc_free to free the ldb_message returned in 'res'
259 int ldb_search(struct ldb_context *ldb,
260 const struct ldb_dn *base,
261 enum ldb_scope scope,
262 const char *expression,
263 const char * const *attrs,
264 struct ldb_result **res)
266 struct ldb_request request;
267 struct ldb_parse_tree *tree;
272 tree = ldb_parse_tree(ldb, expression);
274 ldb_set_errstring(ldb->modules, talloc_strdup(ldb, "Unable to parse search expression"));
278 request.operation = LDB_REQ_SEARCH;
279 request.op.search.base = base;
280 request.op.search.scope = scope;
281 request.op.search.tree = tree;
282 request.op.search.attrs = attrs;
284 ret = ldb_request(ldb, &request);
286 (*res) = request.op.search.res;
294 add a record to the database. Will fail if a record with the given class and key
297 int ldb_add(struct ldb_context *ldb,
298 const struct ldb_message *message)
300 struct ldb_request request;
303 status = ldb_msg_sanity_check(message);
304 if (status != LDB_SUCCESS) return status;
306 request.operation = LDB_REQ_ADD;
307 request.op.add.message = message;
309 return ldb_request(ldb, &request);
313 modify the specified attributes of a record
315 int ldb_modify(struct ldb_context *ldb,
316 const struct ldb_message *message)
318 struct ldb_request request;
321 status = ldb_msg_sanity_check(message);
322 if (status != LDB_SUCCESS) return status;
324 request.operation = LDB_REQ_MODIFY;
325 request.op.mod.message = message;
327 return ldb_request(ldb, &request);
332 delete a record from the database
334 int ldb_delete(struct ldb_context *ldb, const struct ldb_dn *dn)
336 struct ldb_request request;
338 request.operation = LDB_REQ_DELETE;
339 request.op.del.dn = dn;
341 return ldb_request(ldb, &request);
345 rename a record in the database
347 int ldb_rename(struct ldb_context *ldb, const struct ldb_dn *olddn, const struct ldb_dn *newdn)
349 struct ldb_request request;
351 request.operation = LDB_REQ_RENAME;
352 request.op.rename.olddn = olddn;
353 request.op.rename.newdn = newdn;
355 return ldb_request(ldb, &request);
361 return extended error information
363 const char *ldb_errstring(struct ldb_context *ldb)
365 if (ldb->err_string) {
366 return ldb->err_string;
374 set backend specific opaque parameters
376 int ldb_set_opaque(struct ldb_context *ldb, const char *name, void *value)
378 struct ldb_opaque *o;
380 /* allow updating an existing value */
381 for (o=ldb->opaque;o;o=o->next) {
382 if (strcmp(o->name, name) == 0) {
388 o = talloc(ldb, struct ldb_opaque);
391 return LDB_ERR_OTHER;
393 o->next = ldb->opaque;
401 get a previously set opaque value
403 void *ldb_get_opaque(struct ldb_context *ldb, const char *name)
405 struct ldb_opaque *o;
406 for (o=ldb->opaque;o;o=o->next) {
407 if (strcmp(o->name, name) == 0) {