4 Copyright (C) Andrew Bartlett <abartlet@samba.org> 2007
5 Copyright (C) Simo Sorce <idra@samba.org> 2008
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
24 * Component: ldb linked_attributes module
26 * Description: Module to ensure linked attribute pairs remain in sync
28 * Author: Andrew Bartlett
32 #include "ldb_module.h"
33 #include "util/dlinklist.h"
34 #include "dsdb/samdb/samdb.h"
35 #include "librpc/gen_ndr/ndr_misc.h"
36 #include "dsdb/samdb/ldb_modules/util.h"
39 struct la_context *la_list;
43 struct la_op_store *next;
44 struct la_op_store *prev;
45 enum la_op {LA_OP_ADD, LA_OP_DEL} op;
51 struct replace_context {
52 struct la_context *ac;
53 unsigned int num_elements;
54 struct ldb_message_element *el;
58 struct la_context *next, *prev;
59 const struct dsdb_schema *schema;
60 struct ldb_module *module;
61 struct ldb_request *req;
62 struct ldb_dn *add_dn;
63 struct ldb_dn *del_dn;
64 struct replace_context *rc;
65 struct la_op_store *ops;
66 struct ldb_extended *op_response;
67 struct ldb_control **op_controls;
70 static struct la_context *linked_attributes_init(struct ldb_module *module,
71 struct ldb_request *req)
73 struct ldb_context *ldb;
74 struct la_context *ac;
76 ldb = ldb_module_get_ctx(module);
78 ac = talloc_zero(req, struct la_context);
84 ac->schema = dsdb_get_schema(ldb, ac);
94 static int la_guid_from_dn(struct la_context *ac, struct ldb_dn *dn, struct GUID *guid)
99 status = dsdb_get_extended_dn_guid(dn, guid, "GUID");
100 if (NT_STATUS_IS_OK(status)) {
103 if (!NT_STATUS_EQUAL(status, NT_STATUS_OBJECT_NAME_NOT_FOUND)) {
104 DEBUG(4,(__location__ ": Unable to parse GUID for dn %s\n",
105 ldb_dn_get_linearized(dn)));
106 return ldb_operr(ldb_module_get_ctx(ac->module));
109 ret = dsdb_find_guid_by_dn(ldb_module_get_ctx(ac->module), dn, guid);
110 if (ret != LDB_SUCCESS) {
111 DEBUG(4,(__location__ ": Failed to find GUID for dn %s\n",
112 ldb_dn_get_linearized(dn)));
119 /* Common routine to handle reading the attributes and creating a
120 * series of modify requests */
121 static int la_store_op(struct la_context *ac,
122 enum la_op op, struct ldb_val *dn,
125 struct ldb_context *ldb;
126 struct la_op_store *os;
127 struct ldb_dn *op_dn;
130 ldb = ldb_module_get_ctx(ac->module);
132 op_dn = ldb_dn_from_ldb_val(ac, ldb, dn);
134 ldb_asprintf_errstring(ldb,
135 "could not parse attribute as a DN");
136 return LDB_ERR_INVALID_DN_SYNTAX;
139 os = talloc_zero(ac, struct la_op_store);
146 ret = la_guid_from_dn(ac, op_dn, &os->guid);
148 if (ret == LDB_ERR_NO_SUCH_OBJECT && ac->req->operation == LDB_DELETE) {
149 /* we are deleting an object, and we've found it has a
150 * forward link to a target that no longer
151 * exists. This is not an error in the delete, and we
152 * should just not do the deferred delete of the
158 if (ret != LDB_SUCCESS) {
162 os->name = talloc_strdup(os, name);
167 /* Do deletes before adds */
168 if (op == LA_OP_ADD) {
169 DLIST_ADD_END(ac->ops, os, struct la_op_store *);
171 /* By adding to the head of the list, we do deletes before
172 * adds when processing a replace */
173 DLIST_ADD(ac->ops, os);
179 static int la_queue_mod_request(struct la_context *ac);
180 static int la_down_req(struct la_context *ac);
185 static int linked_attributes_add(struct ldb_module *module, struct ldb_request *req)
187 struct ldb_context *ldb;
188 const struct dsdb_attribute *target_attr;
189 struct la_context *ac;
190 const char *attr_name;
191 struct ldb_control *ctrl;
195 ldb = ldb_module_get_ctx(module);
197 if (ldb_dn_is_special(req->op.add.message->dn)) {
198 /* do not manipulate our control entries */
199 return ldb_next_request(module, req);
202 if (!(ctrl = ldb_request_get_control(req, DSDB_CONTROL_APPLY_LINKS))) {
203 /* don't do anything special for linked attributes, repl_meta_data has done it */
204 return ldb_next_request(module, req);
206 ctrl->critical = false;
208 ac = linked_attributes_init(module, req);
210 return ldb_operr(ldb);
214 /* without schema, this doesn't make any sense */
216 return ldb_next_request(module, req);
219 /* Need to ensure we only have forward links being specified */
220 for (i=0; i < req->op.add.message->num_elements; i++) {
221 const struct ldb_message_element *el = &req->op.add.message->elements[i];
222 const struct dsdb_attribute *schema_attr
223 = dsdb_attribute_by_lDAPDisplayName(ac->schema, el->name);
225 ldb_asprintf_errstring(ldb,
226 "attribute %s is not a valid attribute in schema", el->name);
227 return LDB_ERR_OBJECT_CLASS_VIOLATION;
229 /* We have a valid attribute, now find out if it is a forward link */
230 if ((schema_attr->linkID == 0)) {
234 if ((schema_attr->linkID & 1) == 1) {
235 unsigned int functional_level;
237 functional_level = dsdb_functional_level(ldb);
238 SMB_ASSERT(functional_level > DS_DOMAIN_FUNCTION_2000);
241 /* Even link IDs are for the originating attribute */
242 target_attr = dsdb_attribute_by_linkID(ac->schema, schema_attr->linkID + 1);
245 * windows 2003 has a broken schema where
246 * the definition of msDS-IsDomainFor
247 * is missing (which is supposed to be
248 * the backlink of the msDS-HasDomainNCs
254 attr_name = target_attr->lDAPDisplayName;
256 for (j = 0; j < el->num_values; j++) {
257 ret = la_store_op(ac, LA_OP_ADD,
260 if (ret != LDB_SUCCESS) {
266 /* if no linked attributes are present continue */
267 if (ac->ops == NULL) {
268 /* nothing to do for this module, proceed */
270 return ldb_next_request(module, req);
273 /* start with the original request */
274 return la_down_req(ac);
277 /* For a delete or rename, we need to find out what linked attributes
278 * are currently on this DN, and then deal with them. This is the
279 * callback to the base search */
281 static int la_mod_search_callback(struct ldb_request *req, struct ldb_reply *ares)
283 struct ldb_context *ldb;
284 const struct dsdb_attribute *schema_attr;
285 const struct dsdb_attribute *target_attr;
286 struct ldb_message_element *search_el;
287 struct replace_context *rc;
288 struct la_context *ac;
289 const char *attr_name;
291 int ret = LDB_SUCCESS;
293 ac = talloc_get_type(req->context, struct la_context);
294 ldb = ldb_module_get_ctx(ac->module);
298 return ldb_module_done(ac->req, NULL, NULL,
299 LDB_ERR_OPERATIONS_ERROR);
301 if (ares->error != LDB_SUCCESS) {
302 return ldb_module_done(ac->req, ares->controls,
303 ares->response, ares->error);
306 /* Only entries are interesting, and we only want the olddn */
307 switch (ares->type) {
308 case LDB_REPLY_ENTRY:
310 if (ldb_dn_compare(ares->message->dn, ac->req->op.mod.message->dn) != 0) {
311 ldb_asprintf_errstring(ldb,
312 "linked_attributes: %s is not the DN we were looking for",
313 ldb_dn_get_linearized(ares->message->dn));
314 /* Guh? We only asked for this DN */
316 return ldb_module_done(ac->req, NULL, NULL,
317 LDB_ERR_OPERATIONS_ERROR);
320 ac->add_dn = ac->del_dn = talloc_steal(ac, ares->message->dn);
322 /* We don't populate 'rc' for ADD - it can't be deleting elements anyway */
323 for (i = 0; rc && i < rc->num_elements; i++) {
325 schema_attr = dsdb_attribute_by_lDAPDisplayName(ac->schema, rc->el[i].name);
327 ldb_asprintf_errstring(ldb,
328 "attribute %s is not a valid attribute in schema",
331 return ldb_module_done(ac->req, NULL, NULL,
332 LDB_ERR_OBJECT_CLASS_VIOLATION);
335 search_el = ldb_msg_find_element(ares->message,
338 /* See if this element already exists */
339 /* otherwise just ignore as
340 * the add has already been scheduled */
345 target_attr = dsdb_attribute_by_linkID(ac->schema, schema_attr->linkID + 1);
348 * windows 2003 has a broken schema where
349 * the definition of msDS-IsDomainFor
350 * is missing (which is supposed to be
351 * the backlink of the msDS-HasDomainNCs
356 attr_name = target_attr->lDAPDisplayName;
358 /* Now we know what was there, we can remove it for the re-add */
359 for (j = 0; j < search_el->num_values; j++) {
360 ret = la_store_op(ac, LA_OP_DEL,
361 &search_el->values[j],
363 if (ret != LDB_SUCCESS) {
365 return ldb_module_done(ac->req,
373 case LDB_REPLY_REFERRAL:
381 if (ac->req->operation == LDB_ADD) {
382 /* Start the modifies to the backlinks */
383 ret = la_queue_mod_request(ac);
385 if (ret != LDB_SUCCESS) {
386 return ldb_module_done(ac->req, NULL, NULL,
390 /* Start with the original request */
391 ret = la_down_req(ac);
392 if (ret != LDB_SUCCESS) {
393 return ldb_module_done(ac->req, NULL, NULL, ret);
405 static int linked_attributes_modify(struct ldb_module *module, struct ldb_request *req)
407 /* Look over list of modifications */
408 /* Find if any are for linked attributes */
409 /* Determine the effect of the modification */
410 /* Apply the modify to the linked entry */
412 struct ldb_context *ldb;
414 struct la_context *ac;
415 struct ldb_request *search_req;
417 struct ldb_control *ctrl;
420 ldb = ldb_module_get_ctx(module);
422 if (ldb_dn_is_special(req->op.mod.message->dn)) {
423 /* do not manipulate our control entries */
424 return ldb_next_request(module, req);
427 if (!(ctrl = ldb_request_get_control(req, DSDB_CONTROL_APPLY_LINKS))) {
428 /* don't do anything special for linked attributes, repl_meta_data has done it */
429 return ldb_next_request(module, req);
431 ctrl->critical = false;
433 ac = linked_attributes_init(module, req);
435 return ldb_operr(ldb);
439 /* without schema, this doesn't make any sense */
440 return ldb_next_request(module, req);
443 ac->rc = talloc_zero(ac, struct replace_context);
448 for (i=0; i < req->op.mod.message->num_elements; i++) {
449 bool store_el = false;
450 const char *attr_name;
451 const struct dsdb_attribute *target_attr;
452 const struct ldb_message_element *el = &req->op.mod.message->elements[i];
453 const struct dsdb_attribute *schema_attr
454 = dsdb_attribute_by_lDAPDisplayName(ac->schema, el->name);
456 ldb_asprintf_errstring(ldb,
457 "attribute %s is not a valid attribute in schema", el->name);
458 return LDB_ERR_OBJECT_CLASS_VIOLATION;
460 /* We have a valid attribute, now find out if it is a forward link
461 (Even link IDs are for the originating attribute) */
462 if (schema_attr->linkID == 0) {
466 if ((schema_attr->linkID & 1) == 1) {
467 unsigned int functional_level;
469 functional_level = dsdb_functional_level(ldb);
470 SMB_ASSERT(functional_level > DS_DOMAIN_FUNCTION_2000);
472 /* Now find the target attribute */
473 target_attr = dsdb_attribute_by_linkID(ac->schema, schema_attr->linkID + 1);
476 * windows 2003 has a broken schema where
477 * the definition of msDS-IsDomainFor
478 * is missing (which is supposed to be
479 * the backlink of the msDS-HasDomainNCs
485 attr_name = target_attr->lDAPDisplayName;
487 switch (el->flags & LDB_FLAG_MOD_MASK) {
488 case LDB_FLAG_MOD_REPLACE:
489 /* treat as just a normal add the delete part is handled by the callback */
492 /* break intentionally missing */
494 case LDB_FLAG_MOD_ADD:
496 /* For each value being added, we need to setup the adds */
497 for (j = 0; j < el->num_values; j++) {
498 ret = la_store_op(ac, LA_OP_ADD,
501 if (ret != LDB_SUCCESS) {
507 case LDB_FLAG_MOD_DELETE:
509 if (el->num_values) {
510 /* For each value being deleted, we need to setup the delete */
511 for (j = 0; j < el->num_values; j++) {
512 ret = la_store_op(ac, LA_OP_DEL,
515 if (ret != LDB_SUCCESS) {
520 /* Flag that there was a DELETE
521 * without a value specified, so we
522 * need to look for the old value */
530 struct ldb_message_element *search_el;
532 search_el = talloc_realloc(ac->rc, ac->rc->el,
533 struct ldb_message_element,
534 ac->rc->num_elements +1);
538 ac->rc->el = search_el;
540 ac->rc->el[ac->rc->num_elements] = *el;
541 ac->rc->num_elements++;
545 if (ac->ops || ac->rc->el) {
546 /* both replace and delete without values are handled in the callback
547 * after the search on the entry to be modified is performed */
549 attrs = talloc_array(ac->rc, const char *, ac->rc->num_elements + 1);
553 for (i = 0; ac->rc && i < ac->rc->num_elements; i++) {
554 attrs[i] = ac->rc->el[i].name;
558 /* The callback does all the hard work here */
559 ret = ldb_build_search_req(&search_req, ldb, ac,
560 req->op.mod.message->dn,
562 "(objectClass=*)", attrs,
564 ac, la_mod_search_callback,
567 /* We need to figure out our own extended DN, to fill in as the backlink target */
568 if (ret == LDB_SUCCESS) {
569 ret = ldb_request_add_control(search_req,
570 LDB_CONTROL_EXTENDED_DN_OID,
573 if (ret == LDB_SUCCESS) {
574 talloc_steal(search_req, attrs);
576 ret = ldb_next_request(module, search_req);
580 /* nothing to do for this module, proceed */
582 ret = ldb_next_request(module, req);
588 static int linked_attributes_fix_links(struct ldb_module *module,
589 struct ldb_dn *old_dn, struct ldb_dn *new_dn,
590 struct ldb_message_element *el, struct dsdb_schema *schema,
591 const struct dsdb_attribute *schema_attr)
594 TALLOC_CTX *tmp_ctx = talloc_new(module);
595 struct ldb_context *ldb = ldb_module_get_ctx(module);
596 const struct dsdb_attribute *target;
597 const char *attrs[2];
600 target = dsdb_attribute_by_linkID(schema, schema_attr->linkID ^ 1);
601 if (target == NULL) {
602 /* there is no counterpart link to change */
606 attrs[0] = target->lDAPDisplayName;
609 for (i=0; i<el->num_values; i++) {
610 struct dsdb_dn *dsdb_dn;
611 struct ldb_result *res;
612 struct ldb_message *msg;
613 struct ldb_message_element *el2;
615 dsdb_dn = dsdb_dn_parse(tmp_ctx, ldb, &el->values[i], schema_attr->syntax->ldap_oid);
616 if (dsdb_dn == NULL) {
617 talloc_free(tmp_ctx);
618 return LDB_ERR_INVALID_DN_SYNTAX;
621 ret = dsdb_module_search_dn(module, tmp_ctx, &res, dsdb_dn->dn,
623 DSDB_FLAG_NEXT_MODULE |
624 DSDB_SEARCH_SHOW_DELETED |
625 DSDB_SEARCH_SHOW_DN_IN_STORAGE_FORMAT |
626 DSDB_SEARCH_REVEAL_INTERNALS);
627 if (ret != LDB_SUCCESS) {
628 ldb_asprintf_errstring(ldb, "Linked attribute %s->%s between %s and %s - remote not found - %s",
629 el->name, target->lDAPDisplayName,
630 ldb_dn_get_linearized(old_dn),
631 ldb_dn_get_linearized(dsdb_dn->dn),
633 talloc_free(tmp_ctx);
638 if (msg->num_elements == 0) {
639 /* Forward link without backlink remaining - nothing to do here */
641 } else if (msg->num_elements != 1) {
642 ldb_asprintf_errstring(ldb, "Bad msg elements - got %u elements, expected one element to be returned in linked_attributes_fix_links for %s",
643 msg->num_elements, ldb_dn_get_linearized(msg->dn));
644 talloc_free(tmp_ctx);
645 return LDB_ERR_OPERATIONS_ERROR;
647 if (ldb_attr_cmp(msg->elements[0].name, target->lDAPDisplayName) != 0) {
648 ldb_asprintf_errstring(ldb, "Bad returned attribute in linked_attributes_fix_links: got %s, expected %s for %s", msg->elements[0].name, target->lDAPDisplayName, ldb_dn_get_linearized(msg->dn));
649 talloc_free(tmp_ctx);
650 return LDB_ERR_OPERATIONS_ERROR;
652 el2 = &msg->elements[0];
654 el2->flags = LDB_FLAG_MOD_REPLACE;
656 /* find our DN in the values */
657 for (j=0; j<el2->num_values; j++) {
658 struct dsdb_dn *dsdb_dn2;
659 dsdb_dn2 = dsdb_dn_parse(msg, ldb, &el2->values[j], target->syntax->ldap_oid);
660 if (dsdb_dn2 == NULL) {
661 talloc_free(tmp_ctx);
662 return LDB_ERR_INVALID_DN_SYNTAX;
664 if (ldb_dn_compare(old_dn, dsdb_dn2->dn) != 0) {
667 ret = ldb_dn_update_components(dsdb_dn2->dn, new_dn);
668 if (ret != LDB_SUCCESS) {
669 talloc_free(tmp_ctx);
673 el2->values[j] = data_blob_string_const(
674 dsdb_dn_get_extended_linearized(el2->values, dsdb_dn2, 1));
677 ret = dsdb_check_single_valued_link(target, el2);
678 if (ret != LDB_SUCCESS) {
679 talloc_free(tmp_ctx);
683 ret = dsdb_module_modify(module, msg, DSDB_FLAG_NEXT_MODULE | DSDB_MODIFY_RELAX);
684 if (ret != LDB_SUCCESS) {
685 ldb_asprintf_errstring(ldb, "Linked attribute %s->%s between %s and %s - update failed - %s",
686 el->name, target->lDAPDisplayName,
687 ldb_dn_get_linearized(old_dn),
688 ldb_dn_get_linearized(dsdb_dn->dn),
690 talloc_free(tmp_ctx);
695 talloc_free(tmp_ctx);
701 static int linked_attributes_rename(struct ldb_module *module, struct ldb_request *req)
703 struct ldb_result *res;
704 struct ldb_message *msg;
706 struct ldb_context *ldb = ldb_module_get_ctx(module);
707 struct dsdb_schema *schema;
710 - load the current msg
711 - find any linked attributes
712 - if its a link then find the target object
713 - modify the target linked attributes with the new DN
715 ret = dsdb_module_search_dn(module, req, &res, req->op.rename.olddn,
717 DSDB_FLAG_NEXT_MODULE |
718 DSDB_SEARCH_SHOW_DELETED);
719 if (ret != LDB_SUCCESS) {
723 schema = dsdb_get_schema(ldb, res);
730 for (i=0; i<msg->num_elements; i++) {
731 struct ldb_message_element *el = &msg->elements[i];
732 const struct dsdb_attribute *schema_attr
733 = dsdb_attribute_by_lDAPDisplayName(schema, el->name);
734 if (!schema_attr || schema_attr->linkID == 0) {
737 ret = linked_attributes_fix_links(module, msg->dn, req->op.rename.newdn, el,
738 schema, schema_attr);
739 if (ret != LDB_SUCCESS) {
747 return ldb_next_request(module, req);
751 /* queue a linked attributes modify request in the la_private
753 static int la_queue_mod_request(struct la_context *ac)
755 struct la_private *la_private =
756 talloc_get_type(ldb_module_get_private(ac->module), struct la_private);
758 if (la_private == NULL) {
759 ldb_debug(ldb_module_get_ctx(ac->module), LDB_DEBUG_ERROR, __location__ ": No la_private transaction setup\n");
760 return ldb_operr(ldb_module_get_ctx(ac->module));
763 talloc_steal(la_private, ac);
764 DLIST_ADD(la_private->la_list, ac);
766 return ldb_module_done(ac->req, ac->op_controls,
767 ac->op_response, LDB_SUCCESS);
770 /* Having done the original operation, then try to fix up all the linked attributes for modify and delete */
771 static int la_mod_del_callback(struct ldb_request *req, struct ldb_reply *ares)
773 struct la_context *ac;
774 struct ldb_context *ldb;
777 ac = talloc_get_type(req->context, struct la_context);
778 ldb = ldb_module_get_ctx(ac->module);
781 return ldb_module_done(ac->req, NULL, NULL,
782 LDB_ERR_OPERATIONS_ERROR);
784 if (ares->error != LDB_SUCCESS) {
785 return ldb_module_done(ac->req, ares->controls,
786 ares->response, ares->error);
789 if (ares->type != LDB_REPLY_DONE) {
790 ldb_set_errstring(ldb,
791 "invalid ldb_reply_type in callback");
793 return ldb_module_done(ac->req, NULL, NULL,
794 LDB_ERR_OPERATIONS_ERROR);
797 ac->op_controls = talloc_steal(ac, ares->controls);
798 ac->op_response = talloc_steal(ac, ares->response);
800 /* If we have modfies to make, this is the time to do them for modify and delete */
801 ret = la_queue_mod_request(ac);
803 if (ret != LDB_SUCCESS) {
804 return ldb_module_done(ac->req, NULL, NULL, ret);
808 /* la_queue_mod_request has already sent the callbacks */
813 /* Having done the original add, then try to fix up all the linked attributes
815 This is done after the add so the links can get the extended DNs correctly.
817 static int la_add_callback(struct ldb_request *req, struct ldb_reply *ares)
819 struct la_context *ac;
820 struct ldb_context *ldb;
823 ac = talloc_get_type(req->context, struct la_context);
824 ldb = ldb_module_get_ctx(ac->module);
827 return ldb_module_done(ac->req, NULL, NULL,
828 LDB_ERR_OPERATIONS_ERROR);
830 if (ares->error != LDB_SUCCESS) {
831 return ldb_module_done(ac->req, ares->controls,
832 ares->response, ares->error);
835 if (ares->type != LDB_REPLY_DONE) {
836 ldb_set_errstring(ldb,
837 "invalid ldb_reply_type in callback");
839 return ldb_module_done(ac->req, NULL, NULL,
840 LDB_ERR_OPERATIONS_ERROR);
844 struct ldb_request *search_req;
845 static const char *attrs[] = { NULL };
847 /* The callback does all the hard work here - we need
848 * the objectGUID and SID of the added record */
849 ret = ldb_build_search_req(&search_req, ldb, ac,
850 ac->req->op.add.message->dn,
852 "(objectClass=*)", attrs,
854 ac, la_mod_search_callback,
857 if (ret == LDB_SUCCESS) {
858 ret = ldb_request_add_control(search_req,
859 LDB_CONTROL_EXTENDED_DN_OID,
862 if (ret != LDB_SUCCESS) {
863 return ldb_module_done(ac->req, NULL, NULL,
867 ac->op_controls = talloc_steal(ac, ares->controls);
868 ac->op_response = talloc_steal(ac, ares->response);
870 return ldb_next_request(ac->module, search_req);
873 return ldb_module_done(ac->req, ares->controls,
874 ares->response, ares->error);
878 /* Reconstruct the original request, but pointing at our local callback to finish things off */
879 static int la_down_req(struct la_context *ac)
881 struct ldb_request *down_req;
882 struct ldb_context *ldb;
885 ldb = ldb_module_get_ctx(ac->module);
887 switch (ac->req->operation) {
889 ret = ldb_build_add_req(&down_req, ldb, ac,
890 ac->req->op.add.message,
896 ret = ldb_build_mod_req(&down_req, ldb, ac,
897 ac->req->op.mod.message,
899 ac, la_mod_del_callback,
903 ret = LDB_ERR_OPERATIONS_ERROR;
905 if (ret != LDB_SUCCESS) {
909 return ldb_next_request(ac->module, down_req);
913 use the GUID part of an extended DN to find the target DN, in case
916 static int la_find_dn_target(struct ldb_module *module, struct la_context *ac,
917 struct GUID *guid, struct ldb_dn **dn)
919 return dsdb_find_dn_by_guid(ldb_module_get_ctx(ac->module), ac, guid, dn);
922 /* apply one la_context op change */
923 static int la_do_op_request(struct ldb_module *module, struct la_context *ac, struct la_op_store *op)
925 struct ldb_message_element *ret_el;
926 struct ldb_message *new_msg;
927 struct ldb_context *ldb;
930 ldb = ldb_module_get_ctx(ac->module);
932 /* Create the modify request */
933 new_msg = ldb_msg_new(ac);
938 ret = la_find_dn_target(module, ac, &op->guid, &new_msg->dn);
939 if (ret != LDB_SUCCESS) {
943 if (op->op == LA_OP_ADD) {
944 ret = ldb_msg_add_empty(new_msg, op->name,
945 LDB_FLAG_MOD_ADD, &ret_el);
947 ret = ldb_msg_add_empty(new_msg, op->name,
948 LDB_FLAG_MOD_DELETE, &ret_el);
950 if (ret != LDB_SUCCESS) {
953 ret_el->values = talloc_array(new_msg, struct ldb_val, 1);
954 if (!ret_el->values) {
957 ret_el->num_values = 1;
958 if (op->op == LA_OP_ADD) {
959 ret_el->values[0] = data_blob_string_const(ldb_dn_get_extended_linearized(new_msg, ac->add_dn, 1));
961 ret_el->values[0] = data_blob_string_const(ldb_dn_get_extended_linearized(new_msg, ac->del_dn, 1));
965 ldb_debug(ldb, LDB_DEBUG_WARNING,
966 "link on %s %s: %s %s\n",
967 ldb_dn_get_linearized(new_msg->dn), ret_el->name,
968 ret_el->values[0].data, ac->ops->op == LA_OP_ADD ? "added" : "deleted");
972 DEBUG(4,("Applying linked attribute change:\n%s\n",
973 ldb_ldif_message_string(ldb, op, LDB_CHANGETYPE_MODIFY, new_msg)));
976 ret = dsdb_module_modify(module, new_msg, DSDB_FLAG_NEXT_MODULE);
977 if (ret != LDB_SUCCESS) {
978 ldb_debug(ldb, LDB_DEBUG_WARNING, "Failed to apply linked attribute change '%s'\n%s\n",
980 ldb_ldif_message_string(ldb, op, LDB_CHANGETYPE_MODIFY, new_msg));
986 /* apply one set of la_context changes */
987 static int la_do_mod_request(struct ldb_module *module, struct la_context *ac)
989 struct la_op_store *op;
991 for (op = ac->ops; op; op=op->next) {
992 int ret = la_do_op_request(module, ac, op);
993 if (ret != LDB_SUCCESS) {
994 if (ret != LDB_ERR_NO_SUCH_OBJECT) {
1005 we hook into the transaction operations to allow us to
1006 perform the linked attribute updates at the end of the whole
1007 transaction. This allows a forward linked attribute to be created
1008 before the target is created, as long as the target is created
1009 in the same transaction
1011 static int linked_attributes_start_transaction(struct ldb_module *module)
1013 /* create our private structure for this transaction */
1014 struct la_private *la_private = talloc_get_type(ldb_module_get_private(module),
1016 talloc_free(la_private);
1017 la_private = talloc(module, struct la_private);
1018 if (la_private == NULL) {
1019 return ldb_oom(ldb_module_get_ctx(module));
1021 la_private->la_list = NULL;
1022 ldb_module_set_private(module, la_private);
1023 return ldb_next_start_trans(module);
1027 on prepare commit we loop over our queued la_context structures
1028 and apply each of them
1030 static int linked_attributes_prepare_commit(struct ldb_module *module)
1032 struct la_private *la_private =
1033 talloc_get_type(ldb_module_get_private(module), struct la_private);
1034 struct la_context *ac;
1037 /* prepare commit without begin_transaction - let someone else return the error, just don't segfault */
1038 return ldb_next_prepare_commit(module);
1040 /* walk the list backwards, to do the first entry first, as we
1041 * added the entries with DLIST_ADD() which puts them at the
1042 * start of the list */
1044 /* Start at the end of the list - so we can start
1045 * there, but ensure we don't create a loop by NULLing
1046 * it out in the first element */
1047 ac = DLIST_TAIL(la_private->la_list);
1049 for (; ac; ac=DLIST_PREV(ac)) {
1052 ret = la_do_mod_request(module, ac);
1053 if (ret != LDB_SUCCESS) {
1054 DEBUG(0,(__location__ ": Failed mod request ret=%d\n", ret));
1055 talloc_free(la_private);
1056 ldb_module_set_private(module, NULL);
1061 talloc_free(la_private);
1062 ldb_module_set_private(module, NULL);
1064 return ldb_next_prepare_commit(module);
1067 static int linked_attributes_del_transaction(struct ldb_module *module)
1069 struct la_private *la_private =
1070 talloc_get_type(ldb_module_get_private(module), struct la_private);
1071 talloc_free(la_private);
1072 ldb_module_set_private(module, NULL);
1073 return ldb_next_del_trans(module);
1077 _PUBLIC_ const struct ldb_module_ops ldb_linked_attributes_module_ops = {
1078 .name = "linked_attributes",
1079 .add = linked_attributes_add,
1080 .modify = linked_attributes_modify,
1081 .rename = linked_attributes_rename,
1082 .start_transaction = linked_attributes_start_transaction,
1083 .prepare_commit = linked_attributes_prepare_commit,
1084 .del_transaction = linked_attributes_del_transaction,