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Copyright (C) Simo Sorce 2005
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** NOTE! The following LGPL license applies to the ldb
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** library. This does NOT imply that all of Samba is released
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 3 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, see <http://www.gnu.org/licenses/>.
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* Component: ldb attribute scoped query control module
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* Description: this module searches all the the objects pointed
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* by the DNs contained in the references attribute
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#include "ldb/include/includes.h"
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enum {ASQ_SEARCH_BASE, ASQ_SEARCH_MULTI} step;
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struct ldb_module *module;
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int (*up_callback)(struct ldb_context *, void *, struct ldb_reply *);
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const char * const *req_attrs;
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ASQ_CTRL_INVALID_ATTRIBUTE_SYNTAX = 21,
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ASQ_CTRL_UNWILLING_TO_PERFORM = 53,
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ASQ_CTRL_AFFECTS_MULTIPLE_DSA = 71
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struct ldb_request *base_req;
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struct ldb_reply *base_res;
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struct ldb_request **reqs;
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struct ldb_control **controls;
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static struct ldb_handle *init_handle(void *mem_ctx, struct ldb_module *module,
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int (*callback)(struct ldb_context *, void *, struct ldb_reply *))
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struct asq_context *ac;
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h = talloc_zero(mem_ctx, struct ldb_handle);
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ldb_set_errstring(module->ldb, "Out of Memory");
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ac = talloc_zero(h, struct asq_context);
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ldb_set_errstring(module->ldb, "Out of Memory");
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h->private_data = (void *)ac;
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h->state = LDB_ASYNC_INIT;
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h->status = LDB_SUCCESS;
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ac->up_context = context;
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ac->up_callback = callback;
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static int asq_terminate(struct ldb_handle *handle)
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struct asq_context *ac;
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struct ldb_reply *ares;
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struct ldb_asq_control *asq;
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ac = talloc_get_type(handle->private_data, struct asq_context);
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return LDB_ERR_OPERATIONS_ERROR;
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handle->status = LDB_SUCCESS;
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handle->state = LDB_ASYNC_DONE;
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ares = talloc_zero(ac, struct ldb_reply);
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return LDB_ERR_OPERATIONS_ERROR;
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ares->type = LDB_REPLY_DONE;
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for (i = 0; ac->controls[i]; i++);
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ares->controls = talloc_move(ares, &ac->controls);
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ares->controls = talloc_realloc(ares, ares->controls, struct ldb_control *, i + 2);
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if (ares->controls == NULL)
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return LDB_ERR_OPERATIONS_ERROR;
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ares->controls[i] = talloc(ares->controls, struct ldb_control);
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if (ares->controls[i] == NULL)
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return LDB_ERR_OPERATIONS_ERROR;
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ares->controls[i]->oid = LDB_CONTROL_ASQ_OID;
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ares->controls[i]->critical = 0;
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asq = talloc_zero(ares->controls[i], struct ldb_asq_control);
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return LDB_ERR_OPERATIONS_ERROR;
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asq->result = ac->asq_ret;
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ares->controls[i]->data = asq;
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ares->controls[i + 1] = NULL;
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ac->up_callback(ac->module->ldb, ac->up_context, ares);
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static int asq_base_callback(struct ldb_context *ldb, void *context, struct ldb_reply *ares)
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struct asq_context *ac;
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if (!context || !ares) {
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ldb_set_errstring(ldb, "NULL Context or Result in callback");
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if (!(ac = talloc_get_type(context, struct asq_context))) {
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/* we are interested only in the single reply (base search) we receive here */
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if (ares->type == LDB_REPLY_ENTRY) {
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ac->base_res = talloc_move(ac, &ares);
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return LDB_ERR_OPERATIONS_ERROR;
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static int asq_reqs_callback(struct ldb_context *ldb, void *context, struct ldb_reply *ares)
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struct asq_context *ac;
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if (!context || !ares) {
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ldb_set_errstring(ldb, "NULL Context or Result in callback");
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if (!(ac = talloc_get_type(context, struct asq_context))) {
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/* we are interested only in the single reply (base search) we receive here */
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if (ares->type == LDB_REPLY_ENTRY) {
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/* pass the message up to the original callback as we
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* do not have to elaborate on it any further */
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return ac->up_callback(ac->module->ldb, ac->up_context, ares);
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} else { /* ignore any REFERRAL or DONE reply */
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return LDB_ERR_OPERATIONS_ERROR;
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static int asq_search(struct ldb_module *module, struct ldb_request *req)
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struct ldb_control *control;
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struct ldb_asq_control *asq_ctrl;
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struct asq_context *ac;
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struct ldb_handle *h;
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/* check if there's a paged request control */
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control = get_control_from_list(req->controls, LDB_CONTROL_ASQ_OID);
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if (control == NULL) {
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/* not found go on */
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return ldb_next_request(module, req);
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if (!req->callback || !req->context) {
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ldb_set_errstring(module->ldb,
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"Async interface called with NULL callback function or NULL context");
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return LDB_ERR_OPERATIONS_ERROR;
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asq_ctrl = talloc_get_type(control->data, struct ldb_asq_control);
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return LDB_ERR_PROTOCOL_ERROR;
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h = init_handle(req, module, req->context, req->callback);
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return LDB_ERR_OPERATIONS_ERROR;
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if (!(ac = talloc_get_type(h->private_data, struct asq_context))) {
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return LDB_ERR_OPERATIONS_ERROR;
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/* check the search is well formed */
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if (req->op.search.scope != LDB_SCOPE_BASE) {
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ac->asq_ret = ASQ_CTRL_UNWILLING_TO_PERFORM;
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return asq_terminate(h);
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ac->req_attrs = req->op.search.attrs;
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ac->req_attribute = talloc_strdup(ac, asq_ctrl->source_attribute);
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if (ac->req_attribute == NULL)
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return LDB_ERR_OPERATIONS_ERROR;
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/* get the object to retrieve the DNs to search */
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ac->base_req = talloc_zero(req, struct ldb_request);
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if (ac->base_req == NULL)
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return LDB_ERR_OPERATIONS_ERROR;
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ac->base_req->operation = req->operation;
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ac->base_req->op.search.base = req->op.search.base;
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ac->base_req->op.search.scope = LDB_SCOPE_BASE;
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ac->base_req->op.search.tree = req->op.search.tree;
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base_attrs = talloc_array(ac->base_req, char *, 2);
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if (base_attrs == NULL)
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return LDB_ERR_OPERATIONS_ERROR;
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base_attrs[0] = talloc_strdup(base_attrs, asq_ctrl->source_attribute);
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if (base_attrs[0] == NULL)
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return LDB_ERR_OPERATIONS_ERROR;
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base_attrs[1] = NULL;
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ac->base_req->op.search.attrs = (const char * const *)base_attrs;
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ac->base_req->context = ac;
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ac->base_req->callback = asq_base_callback;
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ldb_set_timeout_from_prev_req(module->ldb, req, ac->base_req);
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ac->step = ASQ_SEARCH_BASE;
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ret = ldb_request(module->ldb, ac->base_req);
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if (ret != LDB_SUCCESS) {
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static int asq_requests(struct ldb_handle *handle) {
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struct asq_context *ac;
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struct ldb_message_element *el;
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if (!(ac = talloc_get_type(handle->private_data,
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struct asq_context))) {
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return LDB_ERR_OPERATIONS_ERROR;
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/* look up the DNs */
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if (ac->base_res == NULL) {
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return LDB_ERR_NO_SUCH_OBJECT;
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el = ldb_msg_find_element(ac->base_res->message, ac->req_attribute);
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/* no values found */
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ac->asq_ret = ASQ_CTRL_SUCCESS;
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return asq_terminate(handle);
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/* build up the requests call chain */
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ac->num_reqs = el->num_values;
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ac->reqs = talloc_array(ac, struct ldb_request *, ac->num_reqs);
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if (ac->reqs == NULL) {
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return LDB_ERR_OPERATIONS_ERROR;
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for (i = 0; i < el->num_values; i++) {
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ac->reqs[i] = talloc_zero(ac->reqs, struct ldb_request);
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if (ac->reqs[i] == NULL)
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return LDB_ERR_OPERATIONS_ERROR;
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ac->reqs[i]->operation = LDB_SEARCH;
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ac->reqs[i]->op.search.base = ldb_dn_explode(ac->reqs[i], (const char *)el->values[i].data);
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if (ac->reqs[i]->op.search.base == NULL) {
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ac->asq_ret = ASQ_CTRL_INVALID_ATTRIBUTE_SYNTAX;
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return asq_terminate(handle);
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ac->reqs[i]->op.search.scope = LDB_SCOPE_BASE;
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ac->reqs[i]->op.search.tree = ac->base_req->op.search.tree;
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ac->reqs[i]->op.search.attrs = ac->req_attrs;
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ac->reqs[i]->context = ac;
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ac->reqs[i]->callback = asq_reqs_callback;
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ldb_set_timeout_from_prev_req(ac->module->ldb, ac->base_req, ac->reqs[i]);
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ac->step = ASQ_SEARCH_MULTI;
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static int asq_wait_none(struct ldb_handle *handle)
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struct asq_context *ac;
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if (!handle || !handle->private_data) {
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return LDB_ERR_OPERATIONS_ERROR;
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if (handle->state == LDB_ASYNC_DONE) {
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return handle->status;
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handle->state = LDB_ASYNC_PENDING;
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handle->status = LDB_SUCCESS;
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if (!(ac = talloc_get_type(handle->private_data,
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struct asq_context))) {
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return LDB_ERR_OPERATIONS_ERROR;
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case ASQ_SEARCH_BASE:
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ret = ldb_wait(ac->base_req->handle, LDB_WAIT_NONE);
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if (ret != LDB_SUCCESS) {
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handle->status = ret;
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if (ac->base_req->handle->status != LDB_SUCCESS) {
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handle->status = ac->base_req->handle->status;
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if (ac->base_req->handle->state != LDB_ASYNC_DONE) {
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ret = asq_requests(handle);
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/* no break nor return,
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* the set of requests is performed in ASQ_SEARCH_MULTI
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case ASQ_SEARCH_MULTI:
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if (ac->reqs[ac->cur_req]->handle == NULL) {
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ret = ldb_request(ac->module->ldb, ac->reqs[ac->cur_req]);
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if (ret != LDB_SUCCESS) {
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ret = ldb_wait(ac->reqs[ac->cur_req]->handle, LDB_WAIT_NONE);
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if (ret != LDB_SUCCESS) {
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handle->status = ret;
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if (ac->reqs[ac->cur_req]->handle->status != LDB_SUCCESS) {
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handle->status = ac->reqs[ac->cur_req]->handle->status;
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if (ac->reqs[ac->cur_req]->handle->state == LDB_ASYNC_DONE) {
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if (ac->cur_req < ac->num_reqs) {
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return asq_terminate(handle);
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ret = LDB_ERR_OPERATIONS_ERROR;
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handle->state = LDB_ASYNC_DONE;
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static int asq_wait_all(struct ldb_handle *handle)
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while (handle->state != LDB_ASYNC_DONE) {
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ret = asq_wait_none(handle);
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if (ret != LDB_SUCCESS) {
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return handle->status;
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static int asq_wait(struct ldb_handle *handle, enum ldb_wait_type type)
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if (type == LDB_WAIT_ALL) {
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return asq_wait_all(handle);
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return asq_wait_none(handle);
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static int asq_init(struct ldb_module *module)
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struct ldb_request *req;
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req = talloc_zero(module, struct ldb_request);
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ldb_debug(module->ldb, LDB_DEBUG_ERROR, "asq: Out of memory!\n");
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return LDB_ERR_OPERATIONS_ERROR;
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req->operation = LDB_REQ_REGISTER_CONTROL;
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req->op.reg_control.oid = LDB_CONTROL_ASQ_OID;
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ret = ldb_request(module->ldb, req);
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if (ret != LDB_SUCCESS) {
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ldb_debug(module->ldb, LDB_DEBUG_WARNING, "asq: Unable to register control with rootdse!\n");
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return ldb_next_init(module);
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static const struct ldb_module_ops asq_ops = {
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.search = asq_search,
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.init_context = asq_init
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int ldb_asq_init(void)
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return ldb_register_module(&asq_ops);