4 Copyright (C) Simo Sorce 2005-2006
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 3 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, see <http://www.gnu.org/licenses/>.
25 * Name: paged_searches
27 * Component: ldb paged searches module
29 * Description: this module detects if the remote ldap server supports
30 * paged results and use them to transparently access all objects
36 #include "ldb_includes.h"
38 #define PS_DEFAULT_PAGE_SIZE 500
39 /* 500 objects per query seem to be a decent compromise
40 * the default AD limit per request is 1000 entries */
48 struct ldb_module *module;
50 int (*up_callback)(struct ldb_context *, void *, struct ldb_reply *);
52 struct ldb_request *orig_req;
54 struct ldb_request *new_req;
58 char **saved_referrals;
62 static struct ldb_handle *init_handle(void *mem_ctx, struct ldb_module *module,
64 int (*callback)(struct ldb_context *, void *, struct ldb_reply *))
66 struct ps_context *ac;
69 h = talloc_zero(mem_ctx, struct ldb_handle);
71 ldb_set_errstring(module->ldb, "Out of Memory");
77 ac = talloc_zero(h, struct ps_context);
79 ldb_set_errstring(module->ldb, "Out of Memory");
84 h->private_data = (void *)ac;
86 h->state = LDB_ASYNC_INIT;
87 h->status = LDB_SUCCESS;
90 ac->up_context = context;
91 ac->up_callback = callback;
94 ac->saved_referrals = NULL;
95 ac->num_referrals = 0;
100 static int check_ps_continuation(struct ldb_reply *ares, struct ps_context *ac)
102 struct ldb_paged_control *rep_control, *req_control;
104 /* look up our paged control */
105 if (!ares->controls || strcmp(LDB_CONTROL_PAGED_RESULTS_OID, ares->controls[0]->oid) != 0) {
106 /* something wrong here */
107 return LDB_ERR_OPERATIONS_ERROR;
110 rep_control = talloc_get_type(ares->controls[0]->data, struct ldb_paged_control);
111 if (rep_control->cookie_len == 0) {
117 /* more processing required */
118 /* let's fill in the request control with the new cookie */
119 /* if there's a reply control we must find a request
120 * control matching it */
122 if (strcmp(LDB_CONTROL_PAGED_RESULTS_OID, ac->new_req->controls[0]->oid) != 0) {
123 /* something wrong here */
124 return LDB_ERR_OPERATIONS_ERROR;
127 req_control = talloc_get_type(ac->new_req->controls[0]->data, struct ldb_paged_control);
129 if (req_control->cookie) {
130 talloc_free(req_control->cookie);
133 req_control->cookie = talloc_memdup(req_control,
135 rep_control->cookie_len);
136 req_control->cookie_len = rep_control->cookie_len;
142 static int store_referral(char *referral, struct ps_context *ac)
144 ac->saved_referrals = talloc_realloc(ac, ac->saved_referrals, char *, ac->num_referrals + 2);
145 if (!ac->saved_referrals) {
146 return LDB_ERR_OPERATIONS_ERROR;
149 ac->saved_referrals[ac->num_referrals] = talloc_strdup(ac->saved_referrals, referral);
150 if (!ac->saved_referrals[ac->num_referrals]) {
151 return LDB_ERR_OPERATIONS_ERROR;
155 ac->saved_referrals[ac->num_referrals] = NULL;
160 static int send_referrals(struct ldb_context *ldb, struct ps_context *ac)
162 struct ldb_reply *ares;
165 for (i = 0; i < ac->num_referrals; i++) {
166 ares = talloc_zero(ac, struct ldb_reply);
168 return LDB_ERR_OPERATIONS_ERROR;
171 ares->type = LDB_REPLY_REFERRAL;
172 ares->referral = ac->saved_referrals[i];
174 ac->up_callback(ldb, ac->up_context, ares);
180 static int ps_callback(struct ldb_context *ldb, void *context, struct ldb_reply *ares)
182 struct ps_context *ac = NULL;
183 int ret = LDB_ERR_OPERATIONS_ERROR;
185 if (!context || !ares) {
186 ldb_set_errstring(ldb, "NULL Context or Result in callback");
190 ac = talloc_get_type(context, struct ps_context);
192 switch (ares->type) {
193 case LDB_REPLY_ENTRY:
194 ac->up_callback(ldb, ac->up_context, ares);
197 case LDB_REPLY_REFERRAL:
198 ret = store_referral(ares->referral, ac);
199 if (ret != LDB_SUCCESS) {
205 ret = check_ps_continuation(ares, ac);
206 if (ret != LDB_SUCCESS) {
211 ret = send_referrals(ldb, ac);
212 if (ret != LDB_SUCCESS) {
216 /* send REPLY_DONE */
217 ac->up_callback(ldb, ac->up_context, ares);
231 static int ps_search(struct ldb_module *module, struct ldb_request *req)
233 struct private_data *private_data;
234 struct ldb_paged_control *control;
235 struct ps_context *ac;
236 struct ldb_handle *h;
238 private_data = talloc_get_type(module->private_data, struct private_data);
240 /* check if paging is supported and if there is a any control */
241 if (!private_data || !private_data->paged_supported || req->controls) {
242 /* do not touch this request paged controls not
243 * supported or explicit controls have been set or we
244 * are just not setup yet */
245 return ldb_next_request(module, req);
248 if (!req->callback || !req->context) {
249 ldb_set_errstring(module->ldb,
250 "Async interface called with NULL callback function or NULL context");
251 return LDB_ERR_OPERATIONS_ERROR;
254 h = init_handle(req, module, req->context, req->callback);
256 return LDB_ERR_OPERATIONS_ERROR;
258 ac = talloc_get_type(h->private_data, struct ps_context);
260 ac->new_req = talloc(ac, struct ldb_request);
261 if (!ac->new_req) return LDB_ERR_OPERATIONS_ERROR;
263 ac->new_req->controls = talloc_array(ac->new_req, struct ldb_control *, 2);
264 if (!ac->new_req->controls) return LDB_ERR_OPERATIONS_ERROR;
266 ac->new_req->controls[0] = talloc(ac->new_req->controls, struct ldb_control);
267 if (!ac->new_req->controls[0]) return LDB_ERR_OPERATIONS_ERROR;
269 control = talloc(ac->new_req->controls[0], struct ldb_paged_control);
270 if (!control) return LDB_ERR_OPERATIONS_ERROR;
272 control->size = PS_DEFAULT_PAGE_SIZE;
273 control->cookie = NULL;
274 control->cookie_len = 0;
276 ac->new_req->controls[0]->oid = LDB_CONTROL_PAGED_RESULTS_OID;
277 ac->new_req->controls[0]->critical = 1;
278 ac->new_req->controls[0]->data = control;
280 ac->new_req->controls[1] = NULL;
282 ac->new_req->operation = req->operation;
283 ac->new_req->op.search.base = req->op.search.base;
284 ac->new_req->op.search.scope = req->op.search.scope;
285 ac->new_req->op.search.tree = req->op.search.tree;
286 ac->new_req->op.search.attrs = req->op.search.attrs;
287 ac->new_req->context = ac;
288 ac->new_req->callback = ps_callback;
289 ldb_set_timeout_from_prev_req(module->ldb, req, ac->new_req);
293 return ldb_next_request(module, ac->new_req);
296 static int ps_continuation(struct ldb_handle *handle)
298 struct ps_context *ac;
300 if (!handle || !handle->private_data) {
301 return LDB_ERR_OPERATIONS_ERROR;
304 ac = talloc_get_type(handle->private_data, struct ps_context);
306 /* reset the requests handle */
307 ac->new_req->handle = NULL;
309 return ldb_next_request(handle->module, ac->new_req);
312 static int ps_wait_none(struct ldb_handle *handle)
314 struct ps_context *ac;
317 if (!handle || !handle->private_data) {
318 return LDB_ERR_OPERATIONS_ERROR;
321 if (handle->state == LDB_ASYNC_DONE) {
322 return handle->status;
325 handle->state = LDB_ASYNC_PENDING;
326 handle->status = LDB_SUCCESS;
328 ac = talloc_get_type(handle->private_data, struct ps_context);
330 ret = ldb_wait(ac->new_req->handle, LDB_WAIT_NONE);
332 if (ret != LDB_SUCCESS) {
333 handle->status = ret;
337 if (ac->new_req->handle->status != LDB_SUCCESS) {
338 handle->status = ac->new_req->handle->status;
342 if (ac->new_req->handle->state != LDB_ASYNC_DONE) {
346 /* see if we need to send another request for the next batch */
348 ret = ps_continuation(handle);
349 if (ret != LDB_SUCCESS) {
350 handle->status = ret;
354 /* continue the search with the next request */
361 handle->state = LDB_ASYNC_DONE;
365 static int ps_wait_all(struct ldb_handle *handle)
369 while (handle->state != LDB_ASYNC_DONE) {
370 ret = ps_wait_none(handle);
371 if (ret != LDB_SUCCESS) {
376 return handle->status;
379 static int ps_wait(struct ldb_handle *handle, enum ldb_wait_type type)
381 if (type == LDB_WAIT_ALL) {
382 return ps_wait_all(handle);
384 return ps_wait_none(handle);
388 static int check_supported_paged(struct ldb_context *ldb, void *context,
389 struct ldb_reply *ares)
391 struct private_data *data;
392 data = talloc_get_type(context,
393 struct private_data);
394 if (ares->type == LDB_REPLY_ENTRY) {
395 if (ldb_msg_check_string_attribute(ares->message,
397 LDB_CONTROL_PAGED_RESULTS_OID)) {
398 data->paged_supported = True;
405 static int ps_init(struct ldb_module *module)
407 static const char *attrs[] = { "supportedControl", NULL };
408 struct private_data *data;
410 struct ldb_request *req;
412 data = talloc(module, struct private_data);
414 ldb_set_errstring(module->ldb, "Out of Memory");
415 return LDB_ERR_OTHER;
417 module->private_data = data;
418 data->paged_supported = False;
420 req = talloc(module, struct ldb_request);
422 ldb_set_errstring(module->ldb, "Out of Memory");
423 return LDB_ERR_OPERATIONS_ERROR;
426 req->operation = LDB_SEARCH;
427 req->op.search.base = ldb_dn_new(req, module->ldb, "");
428 req->op.search.scope = LDB_SCOPE_BASE;
430 req->op.search.tree = ldb_parse_tree(req, "objectClass=*");
431 if (req->op.search.tree == NULL) {
432 ldb_set_errstring(module->ldb, "Unable to parse search expression");
434 return LDB_ERR_OPERATIONS_ERROR;
437 req->op.search.attrs = attrs;
438 req->controls = NULL;
440 req->callback = check_supported_paged;
441 ldb_set_timeout(module->ldb, req, 0); /* use default timeout */
443 ret = ldb_next_request(module, req);
445 if (ret == LDB_SUCCESS) {
446 ret = ldb_wait(req->handle, LDB_WAIT_ALL);
450 if (ret != LDB_SUCCESS) {
454 return ldb_next_init(module);
457 static const struct ldb_module_ops ps_ops = {
458 .name = "paged_searches",
461 .init_context = ps_init
464 int ldb_paged_searches_init(void)
466 return ldb_register_module(&ps_ops);