Line data Source code
1 : /*
2 : ldb database mapping module
3 :
4 : Copyright (C) Jelmer Vernooij 2005
5 : Copyright (C) Martin Kuehl <mkhl@samba.org> 2006
6 : Copyright (C) Andrew Bartlett <abartlet@samba.org> 2006
7 : Copyright (C) Simo Sorce <idra@samba.org> 2008
8 :
9 : ** NOTE! The following LGPL license applies to the ldb
10 : ** library. This does NOT imply that all of Samba is released
11 : ** under the LGPL
12 :
13 : This library is free software; you can redistribute it and/or
14 : modify it under the terms of the GNU Lesser General Public
15 : License as published by the Free Software Foundation; either
16 : version 3 of the License, or (at your option) any later version.
17 :
18 : This library is distributed in the hope that it will be useful,
19 : but WITHOUT ANY WARRANTY; without even the implied warranty of
20 : MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 : Lesser General Public License for more details.
22 :
23 : You should have received a copy of the GNU Lesser General Public
24 : License along with this library; if not, see <http://www.gnu.org/licenses/>.
25 :
26 : */
27 :
28 : #include "replace.h"
29 : #include "system/filesys.h"
30 : #include "system/time.h"
31 : #include "ldb_map.h"
32 : #include "ldb_map_private.h"
33 :
34 :
35 : /* Mapping attributes
36 : * ================== */
37 :
38 : /* Select attributes that stay in the local partition. */
39 0 : static const char **map_attrs_select_local(struct ldb_module *module, void *mem_ctx, const char * const *attrs)
40 : {
41 0 : const struct ldb_map_context *data = map_get_context(module);
42 : const char **result;
43 : unsigned int i, last;
44 :
45 0 : if (attrs == NULL)
46 0 : return NULL;
47 :
48 0 : last = 0;
49 0 : result = talloc_array(mem_ctx, const char *, 1);
50 0 : if (result == NULL) {
51 0 : goto failed;
52 : }
53 0 : result[0] = NULL;
54 :
55 0 : for (i = 0; attrs[i]; i++) {
56 : /* Wildcards and ignored attributes are kept locally */
57 0 : if ((ldb_attr_cmp(attrs[i], "*") == 0) ||
58 0 : (!map_attr_check_remote(data, attrs[i]))) {
59 0 : result = talloc_realloc(mem_ctx, result, const char *, last+2);
60 0 : if (result == NULL) {
61 0 : goto failed;
62 : }
63 :
64 0 : result[last] = talloc_strdup(result, attrs[i]);
65 0 : result[last+1] = NULL;
66 0 : last++;
67 : }
68 : }
69 :
70 0 : return result;
71 :
72 0 : failed:
73 0 : talloc_free(result);
74 0 : map_oom(module);
75 0 : return NULL;
76 : }
77 :
78 : /* Collect attributes that are mapped into the remote partition. */
79 0 : static const char **map_attrs_collect_remote(struct ldb_module *module, void *mem_ctx,
80 : const char * const *attrs)
81 : {
82 0 : const struct ldb_map_context *data = map_get_context(module);
83 : const char **result;
84 : const struct ldb_map_attribute *map;
85 0 : const char *name=NULL;
86 : unsigned int i, j, last;
87 : int ret;
88 :
89 0 : last = 0;
90 0 : result = talloc_array(mem_ctx, const char *, 1);
91 0 : if (result == NULL) {
92 0 : goto failed;
93 : }
94 0 : result[0] = NULL;
95 :
96 0 : for (i = 0; attrs[i]; i++) {
97 : /* Wildcards are kept remotely, too */
98 0 : if (ldb_attr_cmp(attrs[i], "*") == 0) {
99 0 : const char **new_attrs = NULL;
100 0 : ret = map_attrs_merge(module, mem_ctx, &new_attrs, attrs);
101 0 : if (ret != LDB_SUCCESS) {
102 0 : goto failed;
103 : }
104 0 : ret = map_attrs_merge(module, mem_ctx, &new_attrs, data->wildcard_attributes);
105 0 : if (ret != LDB_SUCCESS) {
106 0 : goto failed;
107 : }
108 :
109 0 : attrs = new_attrs;
110 0 : break;
111 : }
112 : }
113 :
114 0 : for (i = 0; attrs[i]; i++) {
115 : /* Wildcards are kept remotely, too */
116 0 : if (ldb_attr_cmp(attrs[i], "*") == 0) {
117 : /* Add all 'include in wildcard' attributes */
118 0 : name = attrs[i];
119 0 : goto named;
120 : }
121 :
122 : /* Add remote names of mapped attrs */
123 0 : map = map_attr_find_local(data, attrs[i]);
124 0 : if (map == NULL) {
125 0 : continue;
126 : }
127 :
128 0 : switch (map->type) {
129 0 : case LDB_MAP_IGNORE:
130 0 : continue;
131 :
132 0 : case LDB_MAP_KEEP:
133 0 : name = attrs[i];
134 0 : goto named;
135 :
136 0 : case LDB_MAP_RENAME:
137 : case LDB_MAP_RENDROP:
138 : case LDB_MAP_CONVERT:
139 0 : name = map->u.rename.remote_name;
140 0 : goto named;
141 :
142 0 : case LDB_MAP_GENERATE:
143 : /* Add all remote names of "generate" attrs */
144 0 : for (j = 0; map->u.generate.remote_names[j]; j++) {
145 0 : result = talloc_realloc(mem_ctx, result, const char *, last+2);
146 0 : if (result == NULL) {
147 0 : goto failed;
148 : }
149 :
150 0 : result[last] = talloc_strdup(result, map->u.generate.remote_names[j]);
151 0 : result[last+1] = NULL;
152 0 : last++;
153 : }
154 0 : continue;
155 : }
156 :
157 0 : named: /* We found a single remote name, add that */
158 0 : result = talloc_realloc(mem_ctx, result, const char *, last+2);
159 0 : if (result == NULL) {
160 0 : goto failed;
161 : }
162 :
163 0 : result[last] = talloc_strdup(result, name);
164 0 : result[last+1] = NULL;
165 0 : last++;
166 : }
167 :
168 0 : return result;
169 :
170 0 : failed:
171 0 : talloc_free(result);
172 0 : map_oom(module);
173 0 : return NULL;
174 : }
175 :
176 : /* Split attributes that stay in the local partition from those that
177 : * are mapped into the remote partition. */
178 0 : static int map_attrs_partition(struct ldb_module *module, void *mem_ctx, const char ***local_attrs, const char ***remote_attrs, const char * const *attrs)
179 : {
180 0 : *local_attrs = map_attrs_select_local(module, mem_ctx, attrs);
181 0 : *remote_attrs = map_attrs_collect_remote(module, mem_ctx, attrs);
182 :
183 0 : return 0;
184 : }
185 :
186 : /* Mapping message elements
187 : * ======================== */
188 :
189 : /* Add an element to a message, overwriting any old identically named elements. */
190 0 : static int ldb_msg_replace(struct ldb_message *msg, const struct ldb_message_element *el)
191 : {
192 : struct ldb_message_element *old;
193 : unsigned j;
194 0 : old = ldb_msg_find_element(msg, el->name);
195 :
196 : /* no local result, add as new element */
197 0 : if (old == NULL) {
198 0 : if (ldb_msg_add_empty(msg, el->name, 0, &old) != 0) {
199 0 : return LDB_ERR_OPERATIONS_ERROR;
200 : }
201 : }
202 : else {
203 0 : talloc_free(old->values);
204 : }
205 :
206 0 : old->values = talloc_array(msg->elements, struct ldb_val, el->num_values);
207 0 : old->num_values = el->num_values;
208 0 : if (old->values == NULL) {
209 0 : return LDB_ERR_OPERATIONS_ERROR;
210 : }
211 : /* copy the values into the element */
212 0 : for (j=0;j<el->num_values;j++) {
213 0 : old->values[j] = ldb_val_dup(old->values, &el->values[j]);
214 0 : if (old->values[j].data == NULL && el->values[j].length != 0) {
215 0 : return LDB_ERR_OPERATIONS_ERROR;
216 : }
217 : }
218 :
219 0 : return 0;
220 : }
221 :
222 : /* Map a message element back into the local partition. */
223 0 : static struct ldb_message_element *ldb_msg_el_map_remote(struct ldb_module *module,
224 : void *mem_ctx,
225 : const struct ldb_map_attribute *map,
226 : const char *attr_name,
227 : const struct ldb_message_element *old)
228 : {
229 0 : const struct ldb_map_context *data = map_get_context(module);
230 0 : const char *local_attr_name = attr_name;
231 : struct ldb_message_element *el;
232 : unsigned int i;
233 :
234 0 : el = talloc_zero(mem_ctx, struct ldb_message_element);
235 0 : if (el == NULL) {
236 0 : map_oom(module);
237 0 : return NULL;
238 : }
239 :
240 0 : el->values = talloc_array(el, struct ldb_val, old->num_values);
241 0 : if (el->values == NULL) {
242 0 : talloc_free(el);
243 0 : map_oom(module);
244 0 : return NULL;
245 : }
246 :
247 0 : for (i = 0; data->attribute_maps[i].local_name; i++) {
248 0 : struct ldb_map_attribute *am = &data->attribute_maps[i];
249 0 : if (((am->type == LDB_MAP_RENAME || am->type == LDB_MAP_RENDROP) &&
250 0 : !strcmp(am->u.rename.remote_name, attr_name))
251 0 : || (am->type == LDB_MAP_CONVERT &&
252 0 : !strcmp(am->u.convert.remote_name, attr_name))) {
253 :
254 0 : local_attr_name = am->local_name;
255 0 : break;
256 : }
257 : }
258 :
259 0 : el->name = talloc_strdup(el, local_attr_name);
260 0 : if (el->name == NULL) {
261 0 : talloc_free(el);
262 0 : map_oom(module);
263 0 : return NULL;
264 : }
265 :
266 0 : for (i = 0; i < old->num_values; i++) {
267 0 : el->values[i] = ldb_val_map_remote(module, el->values, map, &old->values[i]);
268 : /* Conversions might fail, in which case bail */
269 0 : if (!el->values[i].data) {
270 0 : talloc_free(el);
271 0 : return NULL;
272 : }
273 0 : el->num_values++;
274 : }
275 :
276 0 : return el;
277 : }
278 :
279 : /* Merge a remote message element into a local message. */
280 0 : static int ldb_msg_el_merge(struct ldb_module *module, struct ldb_message *local,
281 : struct ldb_message *remote, const char *attr_name)
282 : {
283 0 : const struct ldb_map_context *data = map_get_context(module);
284 : const struct ldb_map_attribute *map;
285 0 : struct ldb_message_element *old, *el=NULL;
286 0 : const char *remote_name = NULL;
287 : struct ldb_context *ldb;
288 :
289 0 : ldb = ldb_module_get_ctx(module);
290 :
291 : /* We handle wildcards in ldb_msg_el_merge_wildcard */
292 0 : if (ldb_attr_cmp(attr_name, "*") == 0) {
293 0 : return LDB_SUCCESS;
294 : }
295 :
296 0 : map = map_attr_find_local(data, attr_name);
297 :
298 : /* Unknown attribute in remote message:
299 : * skip, attribute was probably auto-generated */
300 0 : if (map == NULL) {
301 0 : return LDB_SUCCESS;
302 : }
303 :
304 0 : switch (map->type) {
305 0 : case LDB_MAP_IGNORE:
306 0 : break;
307 0 : case LDB_MAP_CONVERT:
308 0 : remote_name = map->u.convert.remote_name;
309 0 : break;
310 0 : case LDB_MAP_KEEP:
311 0 : remote_name = attr_name;
312 0 : break;
313 0 : case LDB_MAP_RENAME:
314 : case LDB_MAP_RENDROP:
315 0 : remote_name = map->u.rename.remote_name;
316 0 : break;
317 0 : case LDB_MAP_GENERATE:
318 0 : break;
319 : }
320 :
321 0 : switch (map->type) {
322 0 : case LDB_MAP_IGNORE:
323 0 : return LDB_SUCCESS;
324 :
325 0 : case LDB_MAP_CONVERT:
326 0 : if (map->u.convert.convert_remote == NULL) {
327 0 : ldb_debug(ldb, LDB_DEBUG_ERROR, "ldb_map: "
328 : "Skipping attribute '%s': "
329 : "'convert_remote' not set",
330 : attr_name);
331 0 : return LDB_SUCCESS;
332 : }
333 :
334 : FALL_THROUGH;
335 : case LDB_MAP_KEEP:
336 : case LDB_MAP_RENAME:
337 : case LDB_MAP_RENDROP:
338 0 : old = ldb_msg_find_element(remote, remote_name);
339 0 : if (old) {
340 0 : el = ldb_msg_el_map_remote(module, local, map, attr_name, old);
341 : } else {
342 0 : return LDB_ERR_NO_SUCH_ATTRIBUTE;
343 : }
344 0 : break;
345 :
346 0 : case LDB_MAP_GENERATE:
347 0 : if (map->u.generate.generate_local == NULL) {
348 0 : ldb_debug(ldb, LDB_DEBUG_ERROR, "ldb_map: "
349 : "Skipping attribute '%s': "
350 : "'generate_local' not set",
351 : attr_name);
352 0 : return LDB_SUCCESS;
353 : }
354 :
355 0 : el = map->u.generate.generate_local(module, local, attr_name, remote);
356 0 : if (!el) {
357 : /* Generation failure is probably due to lack of source attributes */
358 0 : return LDB_ERR_NO_SUCH_ATTRIBUTE;
359 : }
360 0 : break;
361 : }
362 :
363 0 : if (el == NULL) {
364 0 : return LDB_ERR_NO_SUCH_ATTRIBUTE;
365 : }
366 :
367 0 : return ldb_msg_replace(local, el);
368 : }
369 :
370 : /* Handle wildcard parts of merging a remote message element into a local message. */
371 0 : static int ldb_msg_el_merge_wildcard(struct ldb_module *module, struct ldb_message *local,
372 : struct ldb_message *remote)
373 : {
374 0 : const struct ldb_map_context *data = map_get_context(module);
375 0 : const struct ldb_map_attribute *map = map_attr_find_local(data, "*");
376 0 : struct ldb_message_element *el=NULL;
377 : unsigned int i;
378 : int ret;
379 :
380 : /* Perhaps we have a mapping for "*" */
381 0 : if (map && map->type == LDB_MAP_KEEP) {
382 : /* We copy everything over, and hope that anything with a
383 : more specific rule is overwritten */
384 0 : for (i = 0; i < remote->num_elements; i++) {
385 0 : el = ldb_msg_el_map_remote(module, local, map, remote->elements[i].name,
386 0 : &remote->elements[i]);
387 0 : if (el == NULL) {
388 0 : return LDB_ERR_OPERATIONS_ERROR;
389 : }
390 :
391 0 : ret = ldb_msg_replace(local, el);
392 0 : if (ret) {
393 0 : return ret;
394 : }
395 : }
396 : }
397 :
398 : /* Now walk the list of possible mappings, and apply each */
399 0 : for (i = 0; data->attribute_maps[i].local_name; i++) {
400 0 : ret = ldb_msg_el_merge(module, local, remote,
401 0 : data->attribute_maps[i].local_name);
402 0 : if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
403 0 : continue;
404 0 : } else if (ret) {
405 0 : return ret;
406 : } else {
407 0 : continue;
408 : }
409 : }
410 :
411 0 : return LDB_SUCCESS;
412 : }
413 :
414 : /* Mapping messages
415 : * ================ */
416 :
417 : /* Merge two local messages into a single one. */
418 0 : static int ldb_msg_merge_local(struct ldb_module *module, struct ldb_message *msg1, struct ldb_message *msg2)
419 : {
420 : unsigned int i;
421 : int ret;
422 :
423 0 : for (i = 0; i < msg2->num_elements; i++) {
424 0 : ret = ldb_msg_replace(msg1, &msg2->elements[i]);
425 0 : if (ret) {
426 0 : return ret;
427 : }
428 : }
429 :
430 0 : return LDB_SUCCESS;
431 : }
432 :
433 : /* Merge a local and a remote message into a single local one. */
434 0 : static int ldb_msg_merge_remote(struct map_context *ac, struct ldb_message *local,
435 : struct ldb_message *remote)
436 : {
437 : unsigned int i;
438 : int ret;
439 0 : const char * const *attrs = ac->all_attrs;
440 0 : if (!attrs) {
441 0 : ret = ldb_msg_el_merge_wildcard(ac->module, local, remote);
442 0 : if (ret) {
443 0 : return ret;
444 : }
445 : }
446 :
447 0 : for (i = 0; attrs && attrs[i]; i++) {
448 0 : if (ldb_attr_cmp(attrs[i], "*") == 0) {
449 0 : ret = ldb_msg_el_merge_wildcard(ac->module, local, remote);
450 0 : if (ret) {
451 0 : return ret;
452 : }
453 0 : break;
454 : }
455 : }
456 :
457 : /* Try to map each attribute back;
458 : * Add to local message is possible,
459 : * Overwrite old local attribute if necessary */
460 0 : for (i = 0; attrs && attrs[i]; i++) {
461 0 : ret = ldb_msg_el_merge(ac->module, local, remote,
462 0 : attrs[i]);
463 0 : if (ret == LDB_ERR_NO_SUCH_ATTRIBUTE) {
464 0 : } else if (ret) {
465 0 : return ret;
466 : }
467 : }
468 :
469 0 : return LDB_SUCCESS;
470 : }
471 :
472 : /* Mapping search results
473 : * ====================== */
474 :
475 : /* Map a search result back into the local partition. */
476 0 : static int map_reply_remote(struct map_context *ac, struct ldb_reply *ares)
477 : {
478 : struct ldb_message *msg;
479 : struct ldb_dn *dn;
480 : int ret;
481 :
482 : /* There is no result message, skip */
483 0 : if (ares->type != LDB_REPLY_ENTRY) {
484 0 : return 0;
485 : }
486 :
487 : /* Create a new result message */
488 0 : msg = ldb_msg_new(ares);
489 0 : if (msg == NULL) {
490 0 : map_oom(ac->module);
491 0 : return LDB_ERR_OPERATIONS_ERROR;
492 : }
493 :
494 : /* Merge remote message into new message */
495 0 : ret = ldb_msg_merge_remote(ac, msg, ares->message);
496 0 : if (ret) {
497 0 : talloc_free(msg);
498 0 : return ret;
499 : }
500 :
501 : /* Create corresponding local DN */
502 0 : dn = ldb_dn_map_rebase_remote(ac->module, msg, ares->message->dn);
503 0 : if (dn == NULL) {
504 0 : talloc_free(msg);
505 0 : return LDB_ERR_OPERATIONS_ERROR;
506 : }
507 0 : msg->dn = dn;
508 :
509 : /* Store new message with new DN as the result */
510 0 : talloc_free(ares->message);
511 0 : ares->message = msg;
512 :
513 0 : return 0;
514 : }
515 :
516 : /* Mapping parse trees
517 : * =================== */
518 :
519 : /* Check whether a parse tree can safely be split in two. */
520 0 : static bool ldb_parse_tree_check_splittable(const struct ldb_parse_tree *tree)
521 : {
522 0 : const struct ldb_parse_tree *subtree = tree;
523 0 : bool negate = false;
524 :
525 0 : while (subtree) {
526 0 : switch (subtree->operation) {
527 0 : case LDB_OP_NOT:
528 0 : negate = !negate;
529 0 : subtree = subtree->u.isnot.child;
530 0 : continue;
531 :
532 0 : case LDB_OP_AND:
533 0 : return !negate; /* if negate: False */
534 :
535 0 : case LDB_OP_OR:
536 0 : return negate; /* if negate: True */
537 :
538 0 : default:
539 0 : return true; /* simple parse tree */
540 : }
541 : }
542 :
543 0 : return true; /* no parse tree */
544 : }
545 :
546 : /* Collect a list of attributes required to match a given parse tree. */
547 0 : static int ldb_parse_tree_collect_attrs(struct ldb_module *module, void *mem_ctx, const char ***attrs, const struct ldb_parse_tree *tree)
548 : {
549 : const char **new_attrs;
550 : unsigned int i;
551 : int ret;
552 :
553 0 : if (tree == NULL) {
554 0 : return 0;
555 : }
556 :
557 0 : switch (tree->operation) {
558 0 : case LDB_OP_OR:
559 : case LDB_OP_AND: /* attributes stored in list of subtrees */
560 0 : for (i = 0; i < tree->u.list.num_elements; i++) {
561 0 : ret = ldb_parse_tree_collect_attrs(module, mem_ctx,
562 0 : attrs, tree->u.list.elements[i]);
563 0 : if (ret) {
564 0 : return ret;
565 : }
566 : }
567 0 : return 0;
568 :
569 0 : case LDB_OP_NOT: /* attributes stored in single subtree */
570 0 : return ldb_parse_tree_collect_attrs(module, mem_ctx, attrs, tree->u.isnot.child);
571 :
572 0 : default: /* single attribute in tree */
573 0 : new_attrs = ldb_attr_list_copy_add(mem_ctx, *attrs, tree->u.equality.attr);
574 0 : talloc_free(*attrs);
575 0 : *attrs = new_attrs;
576 0 : return 0;
577 : }
578 : }
579 :
580 : static int map_subtree_select_local(struct ldb_module *module, void *mem_ctx, struct ldb_parse_tree **new, const struct ldb_parse_tree *tree);
581 :
582 : /* Select a negated subtree that queries attributes in the local partition */
583 0 : static int map_subtree_select_local_not(struct ldb_module *module, void *mem_ctx, struct ldb_parse_tree **new, const struct ldb_parse_tree *tree)
584 : {
585 : struct ldb_parse_tree *child;
586 : int ret;
587 :
588 : /* Prepare new tree */
589 0 : *new = talloc_memdup(mem_ctx, tree, sizeof(struct ldb_parse_tree));
590 0 : if (*new == NULL) {
591 0 : map_oom(module);
592 0 : return LDB_ERR_OPERATIONS_ERROR;
593 : }
594 :
595 : /* Generate new subtree */
596 0 : ret = map_subtree_select_local(module, *new, &child, tree->u.isnot.child);
597 0 : if (ret) {
598 0 : talloc_free(*new);
599 0 : return ret;
600 : }
601 :
602 : /* Prune tree without subtree */
603 0 : if (child == NULL) {
604 0 : talloc_free(*new);
605 0 : *new = NULL;
606 0 : return 0;
607 : }
608 :
609 0 : (*new)->u.isnot.child = child;
610 :
611 0 : return ret;
612 : }
613 :
614 : /* Select a list of subtrees that query attributes in the local partition */
615 0 : static int map_subtree_select_local_list(struct ldb_module *module, void *mem_ctx, struct ldb_parse_tree **new, const struct ldb_parse_tree *tree)
616 : {
617 : unsigned int i, j;
618 0 : int ret=0;
619 :
620 : /* Prepare new tree */
621 0 : *new = talloc_memdup(mem_ctx, tree, sizeof(struct ldb_parse_tree));
622 0 : if (*new == NULL) {
623 0 : map_oom(module);
624 0 : return LDB_ERR_OPERATIONS_ERROR;
625 : }
626 :
627 : /* Prepare list of subtrees */
628 0 : (*new)->u.list.num_elements = 0;
629 0 : (*new)->u.list.elements = talloc_array(*new, struct ldb_parse_tree *, tree->u.list.num_elements);
630 0 : if ((*new)->u.list.elements == NULL) {
631 0 : map_oom(module);
632 0 : talloc_free(*new);
633 0 : return LDB_ERR_OPERATIONS_ERROR;
634 : }
635 :
636 : /* Generate new list of subtrees */
637 0 : j = 0;
638 0 : for (i = 0; i < tree->u.list.num_elements; i++) {
639 0 : struct ldb_parse_tree *child = NULL;
640 0 : ret = map_subtree_select_local(module, *new, &child, tree->u.list.elements[i]);
641 0 : if (ret) {
642 0 : talloc_free(*new);
643 0 : return ret;
644 : }
645 :
646 0 : if (child) {
647 0 : (*new)->u.list.elements[j] = child;
648 0 : j++;
649 : }
650 : }
651 :
652 : /* Prune tree without subtrees */
653 0 : if (j == 0) {
654 0 : talloc_free(*new);
655 0 : *new = NULL;
656 0 : return 0;
657 : }
658 :
659 : /* Fix subtree list size */
660 0 : (*new)->u.list.num_elements = j;
661 0 : (*new)->u.list.elements = talloc_realloc(*new, (*new)->u.list.elements, struct ldb_parse_tree *, (*new)->u.list.num_elements);
662 :
663 0 : return ret;
664 : }
665 :
666 : /* Select a simple subtree that queries attributes in the local partition */
667 0 : static int map_subtree_select_local_simple(struct ldb_module *module, void *mem_ctx, struct ldb_parse_tree **new, const struct ldb_parse_tree *tree)
668 : {
669 : /* Prepare new tree */
670 0 : *new = talloc_memdup(mem_ctx, tree, sizeof(struct ldb_parse_tree));
671 0 : if (*new == NULL) {
672 0 : map_oom(module);
673 0 : return LDB_ERR_OPERATIONS_ERROR;
674 : }
675 :
676 0 : return 0;
677 : }
678 :
679 : /* Select subtrees that query attributes in the local partition */
680 0 : static int map_subtree_select_local(struct ldb_module *module, void *mem_ctx, struct ldb_parse_tree **new, const struct ldb_parse_tree *tree)
681 : {
682 0 : const struct ldb_map_context *data = map_get_context(module);
683 :
684 0 : if (tree == NULL) {
685 0 : return 0;
686 : }
687 :
688 0 : if (tree->operation == LDB_OP_NOT) {
689 0 : return map_subtree_select_local_not(module, mem_ctx, new, tree);
690 : }
691 :
692 0 : if (tree->operation == LDB_OP_AND || tree->operation == LDB_OP_OR) {
693 0 : return map_subtree_select_local_list(module, mem_ctx, new, tree);
694 : }
695 :
696 0 : if (map_attr_check_remote(data, tree->u.equality.attr)) {
697 0 : *new = NULL;
698 0 : return 0;
699 : }
700 :
701 0 : return map_subtree_select_local_simple(module, mem_ctx, new, tree);
702 : }
703 :
704 : static int map_subtree_collect_remote(struct ldb_module *module, void *mem_ctx, struct ldb_parse_tree **new, const struct ldb_parse_tree *tree);
705 :
706 : /* Collect a negated subtree that queries attributes in the remote partition */
707 0 : static int map_subtree_collect_remote_not(struct ldb_module *module, void *mem_ctx, struct ldb_parse_tree **new, const struct ldb_parse_tree *tree)
708 : {
709 : struct ldb_parse_tree *child;
710 : int ret;
711 :
712 : /* Prepare new tree */
713 0 : *new = talloc_memdup(mem_ctx, tree, sizeof(struct ldb_parse_tree));
714 0 : if (*new == NULL) {
715 0 : map_oom(module);
716 0 : return LDB_ERR_OPERATIONS_ERROR;
717 : }
718 :
719 : /* Generate new subtree */
720 0 : ret = map_subtree_collect_remote(module, *new, &child, tree->u.isnot.child);
721 0 : if (ret) {
722 0 : talloc_free(*new);
723 0 : return ret;
724 : }
725 :
726 : /* Prune tree without subtree */
727 0 : if (child == NULL) {
728 0 : talloc_free(*new);
729 0 : *new = NULL;
730 0 : return 0;
731 : }
732 :
733 0 : (*new)->u.isnot.child = child;
734 :
735 0 : return ret;
736 : }
737 :
738 : /* Collect a list of subtrees that query attributes in the remote partition */
739 0 : static int map_subtree_collect_remote_list(struct ldb_module *module, void *mem_ctx, struct ldb_parse_tree **new, const struct ldb_parse_tree *tree)
740 : {
741 : unsigned int i, j;
742 0 : int ret=0;
743 :
744 : /* Prepare new tree */
745 0 : *new = talloc_memdup(mem_ctx, tree, sizeof(struct ldb_parse_tree));
746 0 : if (*new == NULL) {
747 0 : map_oom(module);
748 0 : return LDB_ERR_OPERATIONS_ERROR;
749 : }
750 :
751 : /* Prepare list of subtrees */
752 0 : (*new)->u.list.num_elements = 0;
753 0 : (*new)->u.list.elements = talloc_array(*new, struct ldb_parse_tree *, tree->u.list.num_elements);
754 0 : if ((*new)->u.list.elements == NULL) {
755 0 : map_oom(module);
756 0 : talloc_free(*new);
757 0 : return LDB_ERR_OPERATIONS_ERROR;
758 : }
759 :
760 : /* Generate new list of subtrees */
761 0 : j = 0;
762 0 : for (i = 0; i < tree->u.list.num_elements; i++) {
763 : struct ldb_parse_tree *child;
764 0 : ret = map_subtree_collect_remote(module, *new, &child, tree->u.list.elements[i]);
765 0 : if (ret) {
766 0 : talloc_free(*new);
767 0 : return ret;
768 : }
769 :
770 0 : if (child) {
771 0 : (*new)->u.list.elements[j] = child;
772 0 : j++;
773 : }
774 : }
775 :
776 : /* Prune tree without subtrees */
777 0 : if (j == 0) {
778 0 : talloc_free(*new);
779 0 : *new = NULL;
780 0 : return 0;
781 : }
782 :
783 : /* Fix subtree list size */
784 0 : (*new)->u.list.num_elements = j;
785 0 : (*new)->u.list.elements = talloc_realloc(*new, (*new)->u.list.elements, struct ldb_parse_tree *, (*new)->u.list.num_elements);
786 :
787 0 : return ret;
788 : }
789 :
790 : /* Collect a simple subtree that queries attributes in the remote partition */
791 0 : int map_subtree_collect_remote_simple(struct ldb_module *module, void *mem_ctx, struct ldb_parse_tree **new, const struct ldb_parse_tree *tree, const struct ldb_map_attribute *map)
792 : {
793 : const char *attr;
794 :
795 : /* Prepare new tree */
796 0 : *new = talloc(mem_ctx, struct ldb_parse_tree);
797 0 : if (*new == NULL) {
798 0 : map_oom(module);
799 0 : return LDB_ERR_OPERATIONS_ERROR;
800 : }
801 0 : **new = *tree;
802 :
803 0 : if (map->type == LDB_MAP_KEEP) {
804 : /* Nothing to do here */
805 0 : return 0;
806 : }
807 :
808 : /* Store attribute and value in new tree */
809 0 : switch (tree->operation) {
810 0 : case LDB_OP_PRESENT:
811 0 : attr = map_attr_map_local(*new, map, tree->u.present.attr);
812 0 : (*new)->u.present.attr = attr;
813 0 : break;
814 0 : case LDB_OP_SUBSTRING:
815 : {
816 0 : attr = map_attr_map_local(*new, map, tree->u.substring.attr);
817 0 : (*new)->u.substring.attr = attr;
818 0 : break;
819 : }
820 0 : case LDB_OP_EQUALITY:
821 0 : attr = map_attr_map_local(*new, map, tree->u.equality.attr);
822 0 : (*new)->u.equality.attr = attr;
823 0 : break;
824 0 : case LDB_OP_LESS:
825 : case LDB_OP_GREATER:
826 : case LDB_OP_APPROX:
827 0 : attr = map_attr_map_local(*new, map, tree->u.comparison.attr);
828 0 : (*new)->u.comparison.attr = attr;
829 0 : break;
830 0 : case LDB_OP_EXTENDED:
831 0 : attr = map_attr_map_local(*new, map, tree->u.extended.attr);
832 0 : (*new)->u.extended.attr = attr;
833 0 : break;
834 0 : default: /* unknown kind of simple subtree */
835 0 : talloc_free(*new);
836 0 : return LDB_ERR_OPERATIONS_ERROR;
837 : }
838 :
839 0 : if (attr == NULL) {
840 0 : talloc_free(*new);
841 0 : *new = NULL;
842 0 : return 0;
843 : }
844 :
845 0 : if (map->type == LDB_MAP_RENAME || map->type == LDB_MAP_RENDROP) {
846 : /* Nothing more to do here, the attribute has been renamed */
847 0 : return 0;
848 : }
849 :
850 : /* Store attribute and value in new tree */
851 0 : switch (tree->operation) {
852 0 : case LDB_OP_PRESENT:
853 0 : break;
854 0 : case LDB_OP_SUBSTRING:
855 : {
856 : int i;
857 : /* Map value */
858 0 : (*new)->u.substring.chunks = NULL;
859 0 : for (i=0; tree->u.substring.chunks && tree->u.substring.chunks[i]; i++) {
860 0 : (*new)->u.substring.chunks = talloc_realloc(*new, (*new)->u.substring.chunks, struct ldb_val *, i+2);
861 0 : if (!(*new)->u.substring.chunks) {
862 0 : talloc_free(*new);
863 0 : *new = NULL;
864 0 : return 0;
865 : }
866 0 : (*new)->u.substring.chunks[i] = talloc(*new, struct ldb_val);
867 0 : if (!(*new)->u.substring.chunks[i]) {
868 0 : talloc_free(*new);
869 0 : *new = NULL;
870 0 : return 0;
871 : }
872 0 : *(*new)->u.substring.chunks[i] = ldb_val_map_local(module, *new, map, tree->u.substring.chunks[i]);
873 0 : (*new)->u.substring.chunks[i+1] = NULL;
874 : }
875 0 : break;
876 : }
877 0 : case LDB_OP_EQUALITY:
878 0 : (*new)->u.equality.value = ldb_val_map_local(module, *new, map, &tree->u.equality.value);
879 0 : break;
880 0 : case LDB_OP_LESS:
881 : case LDB_OP_GREATER:
882 : case LDB_OP_APPROX:
883 0 : (*new)->u.comparison.value = ldb_val_map_local(module, *new, map, &tree->u.comparison.value);
884 0 : break;
885 0 : case LDB_OP_EXTENDED:
886 0 : (*new)->u.extended.value = ldb_val_map_local(module, *new, map, &tree->u.extended.value);
887 0 : (*new)->u.extended.rule_id = talloc_strdup(*new, tree->u.extended.rule_id);
888 0 : break;
889 0 : default: /* unknown kind of simple subtree */
890 0 : talloc_free(*new);
891 0 : return LDB_ERR_OPERATIONS_ERROR;
892 : }
893 :
894 0 : return 0;
895 : }
896 :
897 : /* Collect subtrees that query attributes in the remote partition */
898 0 : static int map_subtree_collect_remote(struct ldb_module *module, void *mem_ctx, struct ldb_parse_tree **new, const struct ldb_parse_tree *tree)
899 : {
900 0 : const struct ldb_map_context *data = map_get_context(module);
901 : const struct ldb_map_attribute *map;
902 : struct ldb_context *ldb;
903 :
904 0 : ldb = ldb_module_get_ctx(module);
905 :
906 0 : if (tree == NULL) {
907 0 : return 0;
908 : }
909 :
910 0 : if (tree->operation == LDB_OP_NOT) {
911 0 : return map_subtree_collect_remote_not(module, mem_ctx, new, tree);
912 : }
913 :
914 0 : if ((tree->operation == LDB_OP_AND) || (tree->operation == LDB_OP_OR)) {
915 0 : return map_subtree_collect_remote_list(module, mem_ctx, new, tree);
916 : }
917 :
918 0 : if (!map_attr_check_remote(data, tree->u.equality.attr)) {
919 0 : *new = NULL;
920 0 : return 0;
921 : }
922 :
923 0 : map = map_attr_find_local(data, tree->u.equality.attr);
924 0 : if (map == NULL) {
925 0 : return LDB_ERR_OPERATIONS_ERROR;
926 : }
927 0 : if (map->convert_operator) {
928 0 : return map->convert_operator(module, mem_ctx, new, tree);
929 : }
930 :
931 0 : if (map->type == LDB_MAP_GENERATE) {
932 0 : ldb_debug(ldb, LDB_DEBUG_WARNING, "ldb_map: "
933 : "Skipping attribute '%s': "
934 : "'convert_operator' not set",
935 0 : tree->u.equality.attr);
936 0 : *new = NULL;
937 0 : return 0;
938 : }
939 :
940 0 : return map_subtree_collect_remote_simple(module, mem_ctx, new, tree, map);
941 : }
942 :
943 : /* Split subtrees that query attributes in the local partition from
944 : * those that query the remote partition. */
945 0 : static int ldb_parse_tree_partition(struct ldb_module *module,
946 : void *mem_ctx,
947 : struct ldb_parse_tree **local_tree,
948 : struct ldb_parse_tree **remote_tree,
949 : const struct ldb_parse_tree *tree)
950 : {
951 : int ret;
952 :
953 0 : *local_tree = NULL;
954 0 : *remote_tree = NULL;
955 :
956 : /* No original tree */
957 0 : if (tree == NULL) {
958 0 : return 0;
959 : }
960 :
961 : /* Generate local tree */
962 0 : ret = map_subtree_select_local(module, mem_ctx, local_tree, tree);
963 0 : if (ret) {
964 0 : return ret;
965 : }
966 :
967 : /* Generate remote tree */
968 0 : ret = map_subtree_collect_remote(module, mem_ctx, remote_tree, tree);
969 0 : if (ret) {
970 0 : talloc_free(*local_tree);
971 0 : return ret;
972 : }
973 :
974 0 : return 0;
975 : }
976 :
977 : /* Collect a list of attributes required either explicitly from a
978 : * given list or implicitly from a given parse tree; split the
979 : * collected list into local and remote parts. */
980 0 : static int map_attrs_collect_and_partition(struct ldb_module *module, struct map_context *ac,
981 : const char * const *search_attrs,
982 : const struct ldb_parse_tree *tree)
983 : {
984 : void *tmp_ctx;
985 : const char **tree_attrs;
986 : const char **remote_attrs;
987 : const char **local_attrs;
988 : int ret;
989 :
990 : /* There is no tree, just partition the searched attributes */
991 0 : if (tree == NULL) {
992 0 : ret = map_attrs_partition(module, ac,
993 : &local_attrs, &remote_attrs, search_attrs);
994 0 : if (ret == 0) {
995 0 : ac->local_attrs = local_attrs;
996 0 : ac->remote_attrs = remote_attrs;
997 0 : ac->all_attrs = search_attrs;
998 : }
999 0 : return ret;
1000 : }
1001 :
1002 : /* Create context for temporary memory */
1003 0 : tmp_ctx = talloc_new(ac);
1004 0 : if (tmp_ctx == NULL) {
1005 0 : goto oom;
1006 : }
1007 :
1008 : /* Prepare list of attributes from tree */
1009 0 : tree_attrs = talloc_array(tmp_ctx, const char *, 1);
1010 0 : if (tree_attrs == NULL) {
1011 0 : talloc_free(tmp_ctx);
1012 0 : goto oom;
1013 : }
1014 0 : tree_attrs[0] = NULL;
1015 :
1016 : /* Collect attributes from tree */
1017 0 : ret = ldb_parse_tree_collect_attrs(module, tmp_ctx, &tree_attrs, tree);
1018 0 : if (ret) {
1019 0 : goto done;
1020 : }
1021 :
1022 : /* Merge attributes from search operation */
1023 0 : ret = map_attrs_merge(module, tmp_ctx, &tree_attrs, search_attrs);
1024 0 : if (ret) {
1025 0 : goto done;
1026 : }
1027 :
1028 : /* Split local from remote attributes */
1029 0 : ret = map_attrs_partition(module, ac, &local_attrs,
1030 : &remote_attrs, tree_attrs);
1031 :
1032 0 : if (ret == 0) {
1033 0 : ac->local_attrs = local_attrs;
1034 0 : ac->remote_attrs = remote_attrs;
1035 0 : talloc_steal(ac, tree_attrs);
1036 0 : ac->all_attrs = tree_attrs;
1037 : }
1038 0 : done:
1039 : /* Free temporary memory */
1040 0 : talloc_free(tmp_ctx);
1041 0 : return ret;
1042 :
1043 0 : oom:
1044 0 : map_oom(module);
1045 0 : return LDB_ERR_OPERATIONS_ERROR;
1046 : }
1047 :
1048 :
1049 : /* Outbound requests: search
1050 : * ========================= */
1051 :
1052 : static int map_remote_search_callback(struct ldb_request *req,
1053 : struct ldb_reply *ares);
1054 : static int map_local_merge_callback(struct ldb_request *req,
1055 : struct ldb_reply *ares);
1056 : static int map_search_local(struct map_context *ac);
1057 :
1058 0 : static int map_save_entry(struct map_context *ac, struct ldb_reply *ares)
1059 : {
1060 : struct map_reply *mr;
1061 :
1062 0 : mr = talloc_zero(ac, struct map_reply);
1063 0 : if (mr == NULL) {
1064 0 : map_oom(ac->module);
1065 0 : return LDB_ERR_OPERATIONS_ERROR;
1066 : }
1067 0 : mr->remote = talloc_steal(mr, ares);
1068 0 : if (ac->r_current) {
1069 0 : ac->r_current->next = mr;
1070 : } else {
1071 : /* first entry */
1072 0 : ac->r_list = mr;
1073 : }
1074 0 : ac->r_current = mr;
1075 :
1076 0 : return LDB_SUCCESS;
1077 : }
1078 :
1079 : /* Pass a merged search result up the callback chain. */
1080 0 : int map_return_entry(struct map_context *ac, struct ldb_reply *ares)
1081 : {
1082 : struct ldb_message_element *el;
1083 : const char * const *attrs;
1084 : struct ldb_context *ldb;
1085 : unsigned int i;
1086 : int ret;
1087 : bool matched;
1088 :
1089 0 : ldb = ldb_module_get_ctx(ac->module);
1090 :
1091 : /* Merged result doesn't match original query, skip */
1092 0 : ret = ldb_match_msg_error(ldb, ares->message,
1093 0 : ac->req->op.search.tree,
1094 0 : ac->req->op.search.base,
1095 0 : ac->req->op.search.scope,
1096 : &matched);
1097 0 : if (ret != LDB_SUCCESS) return ret;
1098 0 : if (!matched) {
1099 0 : ldb_debug(ldb, LDB_DEBUG_TRACE, "ldb_map: "
1100 : "Skipping record '%s': "
1101 : "doesn't match original search",
1102 0 : ldb_dn_get_linearized(ares->message->dn));
1103 0 : return LDB_SUCCESS;
1104 : }
1105 :
1106 : /* Limit result to requested attrs */
1107 0 : if (ac->req->op.search.attrs &&
1108 0 : (! ldb_attr_in_list(ac->req->op.search.attrs, "*"))) {
1109 :
1110 0 : attrs = ac->req->op.search.attrs;
1111 0 : i = 0;
1112 :
1113 0 : while (i < ares->message->num_elements) {
1114 :
1115 0 : el = &ares->message->elements[i];
1116 0 : if ( ! ldb_attr_in_list(attrs, el->name)) {
1117 0 : ldb_msg_remove_element(ares->message, el);
1118 : } else {
1119 0 : i++;
1120 : }
1121 : }
1122 : }
1123 :
1124 0 : return ldb_module_send_entry(ac->req, ares->message, ares->controls);
1125 : }
1126 :
1127 : /* Search a record. */
1128 0 : int ldb_map_search(struct ldb_module *module, struct ldb_request *req)
1129 : {
1130 : struct ldb_parse_tree *remote_tree;
1131 : struct ldb_parse_tree *local_tree;
1132 : struct ldb_request *remote_req;
1133 : struct ldb_context *ldb;
1134 : struct map_context *ac;
1135 : int ret;
1136 :
1137 0 : const char *wildcard[] = { "*", NULL };
1138 : const char * const *attrs;
1139 :
1140 0 : ldb = ldb_module_get_ctx(module);
1141 :
1142 : /* if we're not yet initialized, go to the next module */
1143 0 : if (!ldb_module_get_private(module))
1144 0 : return ldb_next_request(module, req);
1145 :
1146 : /* Do not manipulate our control entries */
1147 0 : if (ldb_dn_is_special(req->op.search.base)) {
1148 0 : return ldb_next_request(module, req);
1149 : }
1150 :
1151 : /* No mapping requested, skip to next module */
1152 0 : if ((req->op.search.base) && (!ldb_dn_check_local(module, req->op.search.base))) {
1153 0 : return ldb_next_request(module, req);
1154 : }
1155 :
1156 : /* TODO: How can we be sure about which partition we are
1157 : * targetting when there is no search base? */
1158 :
1159 : /* Prepare context and handle */
1160 0 : ac = map_init_context(module, req);
1161 0 : if (ac == NULL) {
1162 0 : return LDB_ERR_OPERATIONS_ERROR;
1163 : }
1164 :
1165 : /* It is easier to deal with the two different ways of
1166 : * expressing the wildcard in the same codepath */
1167 0 : attrs = req->op.search.attrs;
1168 0 : if (attrs == NULL) {
1169 0 : attrs = wildcard;
1170 : }
1171 :
1172 : /* Split local from remote attrs */
1173 0 : ret = map_attrs_collect_and_partition(module, ac,
1174 0 : attrs, req->op.search.tree);
1175 0 : if (ret) {
1176 0 : return LDB_ERR_OPERATIONS_ERROR;
1177 : }
1178 :
1179 : /* Split local from remote tree */
1180 0 : ret = ldb_parse_tree_partition(module, ac,
1181 : &local_tree, &remote_tree,
1182 0 : req->op.search.tree);
1183 0 : if (ret) {
1184 0 : return LDB_ERR_OPERATIONS_ERROR;
1185 : }
1186 :
1187 0 : if (((local_tree != NULL) && (remote_tree != NULL)) &&
1188 0 : (!ldb_parse_tree_check_splittable(req->op.search.tree))) {
1189 : /* The query can't safely be split, enumerate the remote partition */
1190 0 : local_tree = NULL;
1191 0 : remote_tree = NULL;
1192 : }
1193 :
1194 0 : if (local_tree == NULL) {
1195 : /* Construct default local parse tree */
1196 0 : local_tree = talloc_zero(ac, struct ldb_parse_tree);
1197 0 : if (local_tree == NULL) {
1198 0 : map_oom(ac->module);
1199 0 : return LDB_ERR_OPERATIONS_ERROR;
1200 : }
1201 :
1202 0 : local_tree->operation = LDB_OP_PRESENT;
1203 0 : local_tree->u.present.attr = talloc_strdup(local_tree, IS_MAPPED);
1204 : }
1205 0 : if (remote_tree == NULL) {
1206 : /* Construct default remote parse tree */
1207 0 : remote_tree = ldb_parse_tree(ac, NULL);
1208 0 : if (remote_tree == NULL) {
1209 0 : return LDB_ERR_OPERATIONS_ERROR;
1210 : }
1211 : }
1212 :
1213 0 : ac->local_tree = local_tree;
1214 :
1215 : /* Prepare the remote operation */
1216 0 : ret = ldb_build_search_req_ex(&remote_req, ldb, ac,
1217 : req->op.search.base,
1218 : req->op.search.scope,
1219 : remote_tree,
1220 : ac->remote_attrs,
1221 : req->controls,
1222 : ac, map_remote_search_callback,
1223 : req);
1224 0 : LDB_REQ_SET_LOCATION(remote_req);
1225 0 : if (ret != LDB_SUCCESS) {
1226 0 : return LDB_ERR_OPERATIONS_ERROR;
1227 : }
1228 :
1229 0 : return ldb_next_remote_request(module, remote_req);
1230 : }
1231 :
1232 : /* Now, search the local part of a remote search result. */
1233 0 : static int map_remote_search_callback(struct ldb_request *req,
1234 : struct ldb_reply *ares)
1235 : {
1236 : struct map_context *ac;
1237 : int ret;
1238 :
1239 0 : ac = talloc_get_type(req->context, struct map_context);
1240 :
1241 0 : if (!ares) {
1242 0 : return ldb_module_done(ac->req, NULL, NULL,
1243 : LDB_ERR_OPERATIONS_ERROR);
1244 : }
1245 0 : if (ares->error != LDB_SUCCESS) {
1246 0 : return ldb_module_done(ac->req, ares->controls,
1247 : ares->response, ares->error);
1248 : }
1249 :
1250 0 : switch (ares->type) {
1251 0 : case LDB_REPLY_REFERRAL:
1252 :
1253 : /* ignore referrals */
1254 0 : talloc_free(ares);
1255 0 : return LDB_SUCCESS;
1256 :
1257 0 : case LDB_REPLY_ENTRY:
1258 :
1259 : /* Map result record into a local message */
1260 0 : ret = map_reply_remote(ac, ares);
1261 0 : if (ret) {
1262 0 : talloc_free(ares);
1263 0 : return ldb_module_done(ac->req, NULL, NULL,
1264 : LDB_ERR_OPERATIONS_ERROR);
1265 : }
1266 :
1267 : /* if we have no local db, then we can just return the reply to
1268 : * the upper layer, otherwise we must save it and process it
1269 : * when all replies ahve been gathered */
1270 0 : if ( ! map_check_local_db(ac->module)) {
1271 0 : ret = map_return_entry(ac, ares);
1272 : } else {
1273 0 : ret = map_save_entry(ac,ares);
1274 : }
1275 :
1276 0 : if (ret != LDB_SUCCESS) {
1277 0 : talloc_free(ares);
1278 0 : return ldb_module_done(ac->req, NULL, NULL, ret);
1279 : }
1280 0 : break;
1281 :
1282 0 : case LDB_REPLY_DONE:
1283 :
1284 0 : if ( ! map_check_local_db(ac->module)) {
1285 0 : return ldb_module_done(ac->req, ares->controls,
1286 : ares->response, LDB_SUCCESS);
1287 : }
1288 :
1289 : /* reset the pointer to the start of the list */
1290 0 : ac->r_current = ac->r_list;
1291 :
1292 : /* no entry just return */
1293 0 : if (ac->r_current == NULL) {
1294 0 : ret = ldb_module_done(ac->req, ares->controls,
1295 : ares->response, LDB_SUCCESS);
1296 0 : talloc_free(ares);
1297 0 : return ret;
1298 : }
1299 :
1300 0 : ac->remote_done_ares = talloc_steal(ac, ares);
1301 :
1302 0 : ret = map_search_local(ac);
1303 0 : if (ret != LDB_SUCCESS) {
1304 0 : return ldb_module_done(ac->req, NULL, NULL, ret);
1305 : }
1306 : }
1307 :
1308 0 : return LDB_SUCCESS;
1309 : }
1310 :
1311 0 : static int map_search_local(struct map_context *ac)
1312 : {
1313 : struct ldb_request *search_req;
1314 :
1315 0 : if (ac->r_current == NULL || ac->r_current->remote == NULL) {
1316 0 : return LDB_ERR_OPERATIONS_ERROR;
1317 : }
1318 :
1319 : /* Prepare local search request */
1320 : /* TODO: use GUIDs here instead? */
1321 0 : search_req = map_search_base_req(ac,
1322 0 : ac->r_current->remote->message->dn,
1323 : NULL, NULL,
1324 : ac, map_local_merge_callback);
1325 0 : if (search_req == NULL) {
1326 0 : return LDB_ERR_OPERATIONS_ERROR;
1327 : }
1328 :
1329 0 : return ldb_next_request(ac->module, search_req);
1330 : }
1331 :
1332 : /* Merge the remote and local parts of a search result. */
1333 0 : int map_local_merge_callback(struct ldb_request *req, struct ldb_reply *ares)
1334 : {
1335 : struct ldb_context *ldb;
1336 : struct map_context *ac;
1337 : int ret;
1338 :
1339 0 : ac = talloc_get_type(req->context, struct map_context);
1340 0 : ldb = ldb_module_get_ctx(ac->module);
1341 :
1342 0 : if (!ares) {
1343 0 : return ldb_module_done(ac->req, NULL, NULL,
1344 : LDB_ERR_OPERATIONS_ERROR);
1345 : }
1346 0 : if (ares->error != LDB_SUCCESS) {
1347 0 : return ldb_module_done(ac->req, ares->controls,
1348 : ares->response, ares->error);
1349 : }
1350 :
1351 0 : switch (ares->type) {
1352 0 : case LDB_REPLY_ENTRY:
1353 : /* We have already found a local record */
1354 0 : if (ac->r_current->local) {
1355 0 : talloc_free(ares);
1356 0 : ldb_set_errstring(ldb, "ldb_map: Too many results!");
1357 0 : return ldb_module_done(ac->req, NULL, NULL,
1358 : LDB_ERR_OPERATIONS_ERROR);
1359 : }
1360 :
1361 : /* Store local result */
1362 0 : ac->r_current->local = talloc_steal(ac->r_current, ares);
1363 :
1364 0 : break;
1365 :
1366 0 : case LDB_REPLY_REFERRAL:
1367 : /* ignore referrals */
1368 0 : talloc_free(ares);
1369 0 : break;
1370 :
1371 0 : case LDB_REPLY_DONE:
1372 : /* We don't need the local 'ares', but we will use the remote one from below */
1373 0 : talloc_free(ares);
1374 :
1375 : /* No local record found, map and send remote record */
1376 0 : if (ac->r_current->local != NULL) {
1377 : /* Merge remote into local message */
1378 0 : ret = ldb_msg_merge_local(ac->module,
1379 0 : ac->r_current->local->message,
1380 0 : ac->r_current->remote->message);
1381 0 : if (ret == LDB_SUCCESS) {
1382 0 : ret = map_return_entry(ac, ac->r_current->local);
1383 : }
1384 0 : if (ret != LDB_SUCCESS) {
1385 0 : return ldb_module_done(ac->req, NULL, NULL,
1386 : LDB_ERR_OPERATIONS_ERROR);
1387 : }
1388 : } else {
1389 0 : ret = map_return_entry(ac, ac->r_current->remote);
1390 0 : if (ret != LDB_SUCCESS) {
1391 0 : return ldb_module_done(ac->req,
1392 : NULL, NULL, ret);
1393 : }
1394 : }
1395 :
1396 0 : if (ac->r_current->next != NULL) {
1397 0 : ac->r_current = ac->r_current->next;
1398 0 : if (ac->r_current->remote->type == LDB_REPLY_ENTRY) {
1399 0 : ret = map_search_local(ac);
1400 0 : if (ret != LDB_SUCCESS) {
1401 0 : return ldb_module_done(ac->req,
1402 : NULL, NULL, ret);
1403 : }
1404 0 : break;
1405 : }
1406 : }
1407 :
1408 : /* ok we are done with all search, finally it is time to
1409 : * finish operations for this module */
1410 0 : return ldb_module_done(ac->req,
1411 0 : ac->remote_done_ares->controls,
1412 0 : ac->remote_done_ares->response,
1413 0 : ac->remote_done_ares->error);
1414 : }
1415 :
1416 0 : return LDB_SUCCESS;
1417 : }
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