2 ldb database library - map backend
4 Copyright (C) Jelmer Vernooij 2005
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
26 #include "lib/ldb/include/ldb.h"
27 #include "lib/ldb/include/ldb_private.h"
28 #include "lib/ldb/ldb_map/ldb_map.h"
31 * - objectclass hint in ldb_map_attribute
32 * for use when multiple remote attributes (independant of each other)
33 * map to one local attribute. E.g.: (uid, gidNumber) -> unixName
37 const struct ldb_map_attribute *attribute_maps;
38 const struct ldb_map_objectclass *objectclass_maps;
39 const char *last_err_string;
42 /* find an attribute by the local name */
43 static const struct ldb_map_attribute *map_find_attr_local(struct ldb_module *module, const char *attr)
45 struct map_private *privdat = module->private_data;
47 for (i = 0; privdat->attribute_maps[i].local_name; i++) {
48 if (!strcmp(privdat->attribute_maps[i].local_name, attr))
49 return &privdat->attribute_maps[i];
55 /* find an attribute by the remote name */
56 static const struct ldb_map_attribute *map_find_attr_remote(struct ldb_module *module, const char *attr)
58 struct map_private *privdat = module->private_data;
60 for (i = 0; privdat->attribute_maps[i].local_name; i++) {
61 if (privdat->attribute_maps[i].type != MAP_RENAME &&
62 privdat->attribute_maps[i].type != MAP_CONVERT)
65 if (!strcmp(privdat->attribute_maps[i].u.rename.remote_name, attr))
66 return &privdat->attribute_maps[i];
72 static struct ldb_parse_tree *ldb_map_parse_tree(struct ldb_module *module, const struct ldb_parse_tree *tree)
75 const struct ldb_map_attribute *attr;
76 struct ldb_parse_tree *new_tree;
81 new_tree = talloc_memdup(module, tree, sizeof(*tree));
83 /* Find attr in question and:
84 * - if it has a convert_operator function, run that
85 * - otherwise, replace attr name with required[0] */
87 if (tree->operation == LDB_OP_AND ||
88 tree->operation == LDB_OP_OR) {
89 for (i = 0; i < tree->u.list.num_elements; i++) {
90 new_tree->u.list.elements[i] = ldb_map_parse_tree(module, tree->u.list.elements[i]);
96 if (tree->operation == LDB_OP_NOT) {
97 new_tree->u.isnot.child = ldb_map_parse_tree(module, tree->u.isnot.child);
101 /* tree->operation is LDB_OP_EQUALITY, LDB_OP_SUBSTRING, LDB_OP_GREATER,
102 * LDB_OP_LESS, LDB_OP_APPROX, LDB_OP_PRESENT or LDB_OP_EXTENDED
104 * (all have attr as the first element)
107 attr = map_find_attr_local(module, tree->u.equality.attr);
110 DEBUG(0, ("Unable to find local attribute '%s', leaving as is\n", tree->u.equality.attr));
114 if (attr->type == MAP_IGNORE)
117 if (attr->convert_operator) {
118 /* Run convert_operator */
119 talloc_free(new_tree);
120 new_tree = attr->convert_operator(module, tree);
122 new_tree->u.equality.attr = talloc_strdup(new_tree, attr->u.rename.remote_name);
128 /* Remote DN -> Local DN */
129 static struct ldb_dn *map_remote_dn(struct ldb_module *module, const struct ldb_dn *dn)
131 struct ldb_dn *newdn;
137 newdn = talloc_memdup(module, dn, sizeof(*dn));
141 newdn->components = talloc_memdup(newdn, dn->components, sizeof(struct ldb_dn_component) * newdn->comp_num);
143 if (!newdn->components)
146 /* For each rdn, map the attribute name and possibly the
149 for (i = 0; i < dn->comp_num; i++) {
150 const struct ldb_map_attribute *attr = map_find_attr_remote(module, dn->components[i].name);
152 /* Unknown attribute - leave this dn as is and hope the best... */
156 if (attr->type == MAP_IGNORE) {
157 DEBUG(0, ("Local MAP_IGNORE attribute '%s' used in DN!", dn->components[i].name));
162 if (attr->type == MAP_GENERATE) {
163 DEBUG(0, ("Local MAP_GENERATE attribute '%s' used in DN!", dn->components[i].name));
169 if (attr->type == MAP_CONVERT) {
170 struct ldb_message_element elm, *newelm;
171 struct ldb_val vals[1] = { dn->components[i].value };
173 elm.name = attr->u.convert.remote_name;
177 newelm = attr->u.convert.convert_remote(module, attr->local_name, &elm);
179 newdn->components[i].name = talloc_strdup(module, newelm->name);
180 newdn->components[i].value = newelm->values[0];
181 } else if (attr->type == MAP_RENAME) {
182 newdn->components[i].name = talloc_strdup(module, attr->local_name);
188 /* Local DN -> Remote DN */
189 static struct ldb_dn *map_local_dn(struct ldb_module *module, const struct ldb_dn *dn)
190 { struct ldb_dn *newdn;
192 struct ldb_parse_tree eqtree, *new_eqtree;
197 newdn = talloc_memdup(module, dn, sizeof(*dn));
201 newdn->components = talloc_memdup(newdn, dn->components, sizeof(struct ldb_dn_component) * newdn->comp_num);
203 if (!newdn->components)
206 /* For each rdn, map the attribute name and possibly the
207 * complete rdn using an equality convert_operator call */
209 for (i = 0; i < dn->comp_num; i++) {
210 const struct ldb_map_attribute *attr = map_find_attr_local(module, dn->components[i].name);
212 /* Unknown attribute - leave this dn as is and hope the best... */
216 if (attr->type == MAP_IGNORE) {
217 DEBUG(0, ("Local MAP_IGNORE attribute '%s' used in DN!", dn->components[i].name));
222 if (attr->type == MAP_GENERATE) {
223 DEBUG(0, ("Local MAP_GENERATE attribute '%s' used in DN!", dn->components[i].name));
229 /* Simple rename/convert only */
230 if (attr->convert_operator) {
232 eqtree.operation = LDB_OP_EQUALITY;
233 eqtree.u.equality.attr = dn->components[i].name;
234 eqtree.u.equality.value = dn->components[i].value;
236 new_eqtree = ldb_map_parse_tree(module, &eqtree);
238 /* Silently continue for now */
240 DEBUG(0, ("Unable to convert RDN for attribute %s\n", dn->components[i].name));
244 newdn->components[i].name = new_eqtree->u.equality.attr;
245 newdn->components[i].value = new_eqtree->u.equality.value;
246 } else if (attr->type == MAP_CONVERT) {
247 struct ldb_message_element elm, *newelm;
248 struct ldb_val vals[1] = { dn->components[i].value };
250 elm.name = attr->local_name;
254 newelm = attr->u.convert.convert_local(module, attr->u.convert.remote_name, &elm);
256 newdn->components[i].name = talloc_strdup(module, newelm->name);
257 newdn->components[i].value = newelm->values[0];
258 } else if (attr->type == MAP_RENAME) {
259 newdn->components[i].name = talloc_strdup(module, attr->u.rename.remote_name);
266 /* Loop over ldb_map_attribute array and add remote_names */
267 static const char **ldb_map_attrs(struct ldb_module *module, const char *const attrs[])
271 int ar_size = 0, last_element = 0;
276 /* Start with good guess of number of elements */
277 for (i = 0; attrs[i]; i++);
279 ret = talloc_array(module, const char *, i);
282 for (i = 0; attrs[i]; i++) {
284 const struct ldb_map_attribute *attr = map_find_attr_local(module, attrs[i]);
287 DEBUG(0, ("Local attribute '%s' does not have a definition!\n", attrs[i]));
293 case MAP_IGNORE: break;
295 if (last_element >= ar_size) {
296 ret = talloc_realloc(module, ret, const char *, ar_size+1);
299 ret[last_element] = attr->local_name;
305 if (last_element >= ar_size) {
306 ret = talloc_realloc(module, ret, const char *, ar_size+1);
309 ret[last_element] = attr->u.rename.remote_name;
314 /* Add remote_names[] for this attribute to the list of
315 * attributes to request from the remote server */
316 for (j = 0; attr->u.generate.remote_names[j]; j++) {
317 if (last_element >= ar_size) {
318 ret = talloc_realloc(module, ret, const char *, ar_size+1);
321 ret[last_element] = attr->u.generate.remote_names[j];
331 static const char **available_local_attributes(struct ldb_module *module, const struct ldb_message *msg)
333 struct map_private *map = module->private_data;
336 const char **ret = talloc_array(module, const char *, 1);
340 for (i = 0; map->attribute_maps[i].local_name; i++) {
342 const struct ldb_map_attribute *attr = &map->attribute_maps[i];
344 /* If all remote attributes for this attribute are present, add the
345 * local one to the list */
347 switch (attr->type) {
348 case MAP_IGNORE: break;
350 avail = (ldb_msg_find_ldb_val(msg, attr->local_name) != NULL);
355 avail = (ldb_msg_find_ldb_val(msg, attr->u.rename.remote_name) != NULL);
360 for (j = 0; attr->u.generate.remote_names[j]; j++) {
361 avail &= (ldb_msg_find_ldb_val(msg, attr->u.generate.remote_names[j]) != NULL);
369 ret = talloc_realloc(module, ret, const char *, count+2);
370 ret[count] = attr->local_name;
378 static struct ldb_message *ldb_map_message_incoming(struct ldb_module *module, const char * const*attrs, const struct ldb_message *mi)
381 struct ldb_message *msg = talloc_zero(module, struct ldb_message);
382 struct ldb_message_element *elm, *oldelm;
383 const char **newattrs = NULL;
385 msg->dn = map_remote_dn(module, mi->dn);
387 /* Loop over attrs, find in ldb_map_attribute array and
391 /* Generate list of the local attributes that /can/ be generated
392 * using the specific remote attributes */
394 attrs = newattrs = available_local_attributes(module, mi);
397 for (i = 0; attrs[i]; i++) {
398 const struct ldb_map_attribute *attr = map_find_attr_local(module, attrs[i]);
401 DEBUG(0, ("Unable to find local attribute '%s' when generating incoming message\n", attrs[i]));
405 switch (attr->type) {
406 case MAP_IGNORE:break;
408 oldelm = ldb_msg_find_element(mi, attr->u.rename.remote_name);
409 elm = talloc_memdup(msg, oldelm, sizeof(*oldelm));
410 elm->name = talloc_strdup(elm, attr->local_name);
412 ldb_msg_add(module->ldb, msg, elm, 0);
416 oldelm = ldb_msg_find_element(mi, attr->u.rename.remote_name);
417 elm = attr->u.convert.convert_local(msg, attr->local_name, oldelm);
419 ldb_msg_add(module->ldb, msg, elm, 0);
423 ldb_msg_add(module->ldb, msg, ldb_msg_find_element(mi, attr->local_name), 0);
427 elm = attr->u.generate.generate_local(msg, attr->local_name, mi);
428 ldb_msg_add(module->ldb, msg, elm, 0);
431 DEBUG(0, ("Unknown attr->type for %s", attr->local_name));
436 talloc_free(newattrs);
441 static struct ldb_message *ldb_map_message_outgoing(struct ldb_module *module, const struct ldb_message *mo)
443 struct ldb_message *msg = talloc_zero(module, struct ldb_message);
444 struct ldb_message_element *elm;
447 msg->private_data = mo->private_data;
449 msg->dn = map_local_dn(module, mo->dn);
451 /* Loop over mi and call generate_remote for each attribute */
452 for (i = 0; i < mo->num_elements; i++) {
453 const struct ldb_map_attribute *attr = map_find_attr_local(module, mo->elements[i].name);
456 DEBUG(0, ("Undefined local attribute '%s', ignoring\n", mo->elements[i].name));
460 switch (attr->type) {
461 case MAP_IGNORE: break;
463 elm = talloc_memdup(msg, &msg->elements[i], sizeof(*elm));
464 elm->name = talloc_strdup(elm, attr->u.rename.remote_name);
466 ldb_msg_add(module->ldb, msg, elm, 0);
470 elm = attr->u.convert.convert_remote(msg, attr->local_name, &msg->elements[i]);
471 ldb_msg_add(module->ldb, msg, elm, 0);
475 ldb_msg_add(module->ldb, msg, &msg->elements[i], 0);
479 attr->u.generate.generate_remote(attr->local_name, mo, msg);
490 static int map_rename(struct ldb_module *module, const struct ldb_dn *olddn, const struct ldb_dn *newdn)
492 struct ldb_dn *n_olddn, *n_newdn;
495 n_olddn = map_local_dn(module, olddn);
496 n_newdn = map_local_dn(module, newdn);
498 ret = ldb_next_rename_record(module, n_olddn, n_newdn);
500 talloc_free(n_olddn);
501 talloc_free(n_newdn);
509 static int map_delete(struct ldb_module *module, const struct ldb_dn *dn)
511 struct ldb_dn *newdn;
514 newdn = map_local_dn(module, dn);
516 ret = ldb_next_delete_record(module, newdn);
524 search for matching records using a ldb_parse_tree
526 static int map_search_bytree(struct ldb_module *module, const struct ldb_dn *base,
527 enum ldb_scope scope, struct ldb_parse_tree *tree,
528 const char * const *attrs, struct ldb_message ***res)
531 const char **newattrs;
532 struct ldb_parse_tree *new_tree;
533 struct ldb_dn *new_base;
534 struct ldb_message **newres;
537 new_tree = ldb_map_parse_tree(module, tree);
538 newattrs = ldb_map_attrs(module, attrs);
539 new_base = map_local_dn(module, base);
541 ret = ldb_next_search_bytree(module, new_base, scope, new_tree, newattrs, &newres);
543 talloc_free(new_base);
544 talloc_free(new_tree);
545 talloc_free(newattrs);
547 *res = talloc_array(module, struct ldb_message *, ret);
549 for (i = 0; i < ret; i++) {
550 (*res)[i] = ldb_map_message_incoming(module, attrs, newres[i]);
551 talloc_free(newres[i]);
557 search for matching records
559 static int map_search(struct ldb_module *module, const struct ldb_dn *base,
560 enum ldb_scope scope, const char *expression,
561 const char * const *attrs, struct ldb_message ***res)
563 struct map_private *map = module->private_data;
564 struct ldb_parse_tree *tree;
567 tree = ldb_parse_tree(NULL, expression);
569 map->last_err_string = "expression parse failed";
573 ret = map_search_bytree(module, base, scope, tree, attrs, res);
581 static int map_add(struct ldb_module *module, const struct ldb_message *msg)
583 struct ldb_message *nmsg = ldb_map_message_outgoing(module, msg);
586 ret = ldb_next_add_record(module, nmsg);
599 static int map_modify(struct ldb_module *module, const struct ldb_message *msg)
601 struct ldb_message *nmsg = ldb_map_message_outgoing(module, msg);
604 ret = ldb_next_modify_record(module, nmsg);
611 static int map_lock(struct ldb_module *module, const char *lockname)
613 return ldb_next_named_lock(module, lockname);
616 static int map_unlock(struct ldb_module *module, const char *lockname)
618 return ldb_next_named_unlock(module, lockname);
622 return extended error information
624 static const char *map_errstring(struct ldb_module *module)
626 struct map_private *map = module->private_data;
628 if (map->last_err_string)
629 return map->last_err_string;
631 return ldb_next_errstring(module);
634 static const struct ldb_module_ops map_ops = {
636 .search = map_search,
637 .search_bytree = map_search_bytree,
638 .add_record = map_add,
639 .modify_record = map_modify,
640 .delete_record = map_delete,
641 .rename_record = map_rename,
642 .named_lock = map_lock,
643 .named_unlock = map_unlock,
644 .errstring = map_errstring
647 /* the init function */
648 struct ldb_module *ldb_map_init(struct ldb_context *ldb, const struct ldb_map_attribute *attrs, const struct ldb_map_objectclass *ocls, const char *options[])
650 struct ldb_module *ctx;
651 struct map_private *data;
653 ctx = talloc(ldb, struct ldb_module);
657 data = talloc(ctx, struct map_private);
663 data->attribute_maps = attrs;
664 data->objectclass_maps = ocls;
665 ctx->private_data = data;
667 ctx->prev = ctx->next = NULL;