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Copyright (C) Simo Sorce 2005-2008
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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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* Name: paged_searches
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* Component: ldb paged searches module
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* Description: this module detects if the remote ldap server supports
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* paged results and use them to transparently access all objects
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#include "ldb_module.h"
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#define PS_DEFAULT_PAGE_SIZE 500
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/* 500 objects per query seem to be a decent compromise
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* the default AD limit per request is 1000 entries */
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struct ldb_module *module;
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struct ldb_request *req;
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char **saved_referrals;
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static int check_ps_continuation(struct ldb_request *req, struct ldb_reply *ares)
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struct ps_context *ac;
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struct ldb_paged_control *rep_control, *req_control;
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ac = talloc_get_type(req->context, struct ps_context);
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/* look up our paged control */
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if (!ares->controls || strcmp(LDB_CONTROL_PAGED_RESULTS_OID, ares->controls[0]->oid) != 0) {
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/* something wrong here */
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return LDB_ERR_OPERATIONS_ERROR;
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rep_control = talloc_get_type(ares->controls[0]->data, struct ldb_paged_control);
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if (rep_control->cookie_len == 0) {
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/* more processing required */
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/* let's fill in the request control with the new cookie */
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/* if there's a reply control we must find a request
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* control matching it */
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if (strcmp(LDB_CONTROL_PAGED_RESULTS_OID, req->controls[0]->oid) != 0) {
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/* something wrong here */
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return LDB_ERR_OPERATIONS_ERROR;
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req_control = talloc_get_type(req->controls[0]->data, struct ldb_paged_control);
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if (req_control->cookie) {
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talloc_free(req_control->cookie);
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req_control->cookie = talloc_memdup(req_control,
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rep_control->cookie_len);
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req_control->cookie_len = rep_control->cookie_len;
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static int store_referral(struct ps_context *ac, char *referral)
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ac->saved_referrals = talloc_realloc(ac, ac->saved_referrals, char *, ac->num_referrals + 2);
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if (!ac->saved_referrals) {
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return LDB_ERR_OPERATIONS_ERROR;
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ac->saved_referrals[ac->num_referrals] = talloc_strdup(ac->saved_referrals, referral);
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if (!ac->saved_referrals[ac->num_referrals]) {
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return LDB_ERR_OPERATIONS_ERROR;
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ac->saved_referrals[ac->num_referrals] = NULL;
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static int send_referrals(struct ps_context *ac)
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struct ldb_reply *ares;
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for (i = 0; i < ac->num_referrals; i++) {
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ares = talloc_zero(ac->req, struct ldb_reply);
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return LDB_ERR_OPERATIONS_ERROR;
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ares->type = LDB_REPLY_REFERRAL;
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ares->referral = ac->saved_referrals[i];
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ret = ldb_module_send_referral(ac->req, ares->referral);
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if (ret != LDB_SUCCESS) {
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static int ps_next_request(struct ps_context *ac);
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static int ps_callback(struct ldb_request *req, struct ldb_reply *ares)
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struct ps_context *ac;
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ac = talloc_get_type(req->context, struct ps_context);
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return ldb_module_done(ac->req, NULL, NULL,
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LDB_ERR_OPERATIONS_ERROR);
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if (ares->error != LDB_SUCCESS) {
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return ldb_module_done(ac->req, ares->controls,
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ares->response, ares->error);
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switch (ares->type) {
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case LDB_REPLY_ENTRY:
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ret = ldb_module_send_entry(ac->req, ares->message, ares->controls);
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if (ret != LDB_SUCCESS) {
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return ldb_module_done(ac->req, NULL, NULL, ret);
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case LDB_REPLY_REFERRAL:
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ret = store_referral(ac, ares->referral);
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if (ret != LDB_SUCCESS) {
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return ldb_module_done(ac->req, NULL, NULL, ret);
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ret = check_ps_continuation(req, ares);
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if (ret != LDB_SUCCESS) {
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return ldb_module_done(ac->req, NULL, NULL, ret);
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ret = ps_next_request(ac);
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if (ret != LDB_SUCCESS) {
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return ldb_module_done(ac->req,
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ret = send_referrals(ac);
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if (ret != LDB_SUCCESS) {
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return ldb_module_done(ac->req,
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/* send REPLY_DONE */
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return ldb_module_done(ac->req, ares->controls,
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ares->response, LDB_SUCCESS);
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static int ps_search(struct ldb_module *module, struct ldb_request *req)
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struct ldb_context *ldb;
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struct private_data *private_data;
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struct ps_context *ac;
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private_data = talloc_get_type(ldb_module_get_private(module), struct private_data);
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ldb = ldb_module_get_ctx(module);
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/* check if paging is supported and if there is a any control */
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if (!private_data || !private_data->paged_supported || req->controls) {
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/* do not touch this request paged controls not
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* supported or explicit controls have been set or we
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* are just not setup yet */
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return ldb_next_request(module, req);
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ac = talloc_zero(req, struct ps_context);
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return LDB_ERR_OPERATIONS_ERROR;
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ac->saved_referrals = NULL;
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ac->num_referrals = 0;
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return ps_next_request(ac);
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static int ps_next_request(struct ps_context *ac) {
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struct ldb_context *ldb;
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struct ldb_paged_control *control;
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struct ldb_control **controls;
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struct ldb_request *new_req;
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ldb = ldb_module_get_ctx(ac->module);
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controls = talloc_array(ac, struct ldb_control *, 2);
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return LDB_ERR_OPERATIONS_ERROR;
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controls[0] = talloc(controls, struct ldb_control);
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return LDB_ERR_OPERATIONS_ERROR;
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control = talloc(controls[0], struct ldb_paged_control);
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return LDB_ERR_OPERATIONS_ERROR;
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control->size = PS_DEFAULT_PAGE_SIZE;
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control->cookie = NULL;
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control->cookie_len = 0;
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controls[0]->oid = LDB_CONTROL_PAGED_RESULTS_OID;
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controls[0]->critical = 1;
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controls[0]->data = control;
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ret = ldb_build_search_req_ex(&new_req, ldb, ac,
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ac->req->op.search.base,
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ac->req->op.search.scope,
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ac->req->op.search.tree,
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ac->req->op.search.attrs,
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if (ret != LDB_SUCCESS) {
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talloc_steal(new_req, controls);
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return ldb_next_request(ac->module, new_req);
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static int check_supported_paged(struct ldb_request *req,
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struct ldb_reply *ares)
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struct private_data *data;
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data = talloc_get_type(req->context, struct private_data);
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return ldb_request_done(req, LDB_ERR_OPERATIONS_ERROR);
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if (ares->error != LDB_SUCCESS) {
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return ldb_request_done(req, LDB_ERR_OPERATIONS_ERROR);
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switch (ares->type) {
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case LDB_REPLY_ENTRY:
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if (ldb_msg_check_string_attribute(ares->message,
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LDB_CONTROL_PAGED_RESULTS_OID)) {
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data->paged_supported = true;
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case LDB_REPLY_REFERRAL:
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return ldb_request_done(req, LDB_SUCCESS);
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static int ps_init(struct ldb_module *module)
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struct ldb_context *ldb;
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static const char *attrs[] = { "supportedControl", NULL };
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struct private_data *data;
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struct ldb_request *req;
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ldb = ldb_module_get_ctx(module);
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data = talloc(module, struct private_data);
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return LDB_ERR_OPERATIONS_ERROR;
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data->paged_supported = false;
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ldb_module_set_private(module, data);
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base = ldb_dn_new(module, ldb, "");
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return LDB_ERR_OPERATIONS_ERROR;
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ret = ldb_build_search_req(&req, ldb, module,
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base, LDB_SCOPE_BASE,
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data, check_supported_paged,
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if (ret != LDB_SUCCESS) {
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ret = ldb_next_request(module, req);
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if (ret == LDB_SUCCESS) {
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ret = ldb_wait(req->handle, LDB_WAIT_ALL);
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if (ret != LDB_SUCCESS) {
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return ldb_next_init(module);
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_PUBLIC_ const struct ldb_module_ops ldb_paged_searches_module_ops = {
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.name = "paged_searches",
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.init_context = ps_init