summaryrefslogtreecommitdiff
path: root/source3/lib/ldb/modules/sort.c
blob: 87545e30e4e2ee200b5f8fed2d78f96105e3542a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
/* 
   ldb database library

   Copyright (C) Simo Sorce  2005

     ** NOTE! The following LGPL license applies to the ldb
     ** library. This does NOT imply that all of Samba is released
     ** under the LGPL
   
   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 3 of the License, or (at your option) any later version.

   This library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with this library; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

/*
 *  Name: ldb
 *
 *  Component: ldb server side sort control module
 *
 *  Description: this module sorts the results of a search
 *
 *  Author: Simo Sorce
 */

#include "includes.h"
#include "ldb/include/includes.h"

struct opaque {
	struct ldb_context *ldb;
	const struct ldb_attrib_handler *h;
	const char *attribute;
	int reverse;
	int result;
};

struct sort_context {
	struct ldb_module *module;
	void *up_context;
	int (*up_callback)(struct ldb_context *, void *, struct ldb_reply *);

	char *attributeName;
	char *orderingRule;
	int reverse;

	struct ldb_request *req;
	struct ldb_message **msgs;
	char **referrals;
	struct ldb_control **controls;
	int num_msgs;
	int num_refs;

	const struct ldb_attrib_handler *h;
	int sort_result;
};

static struct ldb_handle *init_handle(void *mem_ctx, struct ldb_module *module,
					    void *context,
					    int (*callback)(struct ldb_context *, void *, struct ldb_reply *))
{
	struct sort_context *ac;
	struct ldb_handle *h;

	h = talloc_zero(mem_ctx, struct ldb_handle);
	if (h == NULL) {
		ldb_set_errstring(module->ldb, "Out of Memory");
		return NULL;
	}

	h->module = module;

	ac = talloc_zero(h, struct sort_context);
	if (ac == NULL) {
		ldb_set_errstring(module->ldb, "Out of Memory");
		talloc_free(h);
		return NULL;
	}

	h->private_data = (void *)ac;

	h->state = LDB_ASYNC_INIT;
	h->status = LDB_SUCCESS;

	ac->module = module;
	ac->up_context = context;
	ac->up_callback = callback;

	return h;
}

static int build_response(void *mem_ctx, struct ldb_control ***ctrls, int result, const char *desc)
{
	struct ldb_control **controls;
	struct ldb_sort_resp_control *resp;
	int i;

	if (*ctrls) {
		controls = *ctrls;
		for (i = 0; controls[i]; i++);
		controls = talloc_realloc(mem_ctx, controls, struct ldb_control *, i + 2);
	} else {
		i = 0;
		controls = talloc_array(mem_ctx, struct ldb_control *, 2);
	}
	if (! controls )
		return LDB_ERR_OPERATIONS_ERROR;

	*ctrls = controls;

	controls[i+1] = NULL;
	controls[i] = talloc(controls, struct ldb_control);
	if (! controls[i] )
		return LDB_ERR_OPERATIONS_ERROR;

	controls[i]->oid = LDB_CONTROL_SORT_RESP_OID;
	controls[i]->critical = 0;

	resp = talloc(controls[i], struct ldb_sort_resp_control);
	if (! resp )
		return LDB_ERR_OPERATIONS_ERROR;

	resp->result = result;
	resp->attr_desc = talloc_strdup(resp, desc);

	if (! resp->attr_desc )
		return LDB_ERR_OPERATIONS_ERROR;
	
	controls[i]->data = resp;

	return LDB_SUCCESS;
}

static int sort_compare(struct ldb_message **msg1, struct ldb_message **msg2, void *opaque)
{
	struct sort_context *ac = talloc_get_type(opaque, struct sort_context);
	struct ldb_message_element *el1, *el2;

	if (ac->sort_result != 0) {
		/* an error occurred previously,
		 * let's exit the sorting by returning always 0 */
		return 0;
	}

	el1 = ldb_msg_find_element(*msg1, ac->attributeName);
	el2 = ldb_msg_find_element(*msg2, ac->attributeName);

	if (!el1 || !el2) {
		/* the attribute was not found return and
		 * set an error */
		ac->sort_result = 53;
		return 0;
	}

	if (ac->reverse)
		return ac->h->comparison_fn(ac->module->ldb, ac, &el2->values[0], &el1->values[0]);

	return ac->h->comparison_fn(ac->module->ldb, ac, &el1->values[0], &el2->values[0]);
}

static int server_sort_search_callback(struct ldb_context *ldb, void *context, struct ldb_reply *ares)
{
	struct sort_context *ac = NULL;
	
 	if (!context || !ares) {
		ldb_set_errstring(ldb, "NULL Context or Result in callback");
		goto error;
	}	

       	ac = talloc_get_type(context, struct sort_context);

	if (ares->type == LDB_REPLY_ENTRY) {
		ac->msgs = talloc_realloc(ac, ac->msgs, struct ldb_message *, ac->num_msgs + 2);
		if (! ac->msgs) {
			goto error;
		}

		ac->msgs[ac->num_msgs + 1] = NULL;

		ac->msgs[ac->num_msgs] = talloc_move(ac->msgs, &ares->message);
		ac->num_msgs++;
	}

	if (ares->type == LDB_REPLY_REFERRAL) {
		ac->referrals = talloc_realloc(ac, ac->referrals, char *, ac->num_refs + 2);
		if (! ac->referrals) {
			goto error;
		}

		ac->referrals[ac->num_refs + 1] = NULL;
		ac->referrals[ac->num_refs] = talloc_move(ac->referrals, &ares->referral);

		ac->num_refs++;
	}

	if (ares->type == LDB_REPLY_DONE) {
		ac->controls = talloc_move(ac, &ares->controls);
	}

	talloc_free(ares);
	return LDB_SUCCESS;

error:
	talloc_free(ares);
	return LDB_ERR_OPERATIONS_ERROR;
}

static int server_sort_search(struct ldb_module *module, struct ldb_request *req)
{
	struct ldb_control *control;
	struct ldb_server_sort_control **sort_ctrls;
	struct ldb_control **saved_controls;
	struct sort_context *ac;
	struct ldb_handle *h;
	int ret;

	/* check if there's a paged request control */
	control = get_control_from_list(req->controls, LDB_CONTROL_SERVER_SORT_OID);
	if (control == NULL) {
		/* not found go on */
		return ldb_next_request(module, req);
	}

	req->handle = NULL;

	if (!req->callback || !req->context) {
		ldb_set_errstring(module->ldb,
				  "Async interface called with NULL callback function or NULL context");
		return LDB_ERR_OPERATIONS_ERROR;
	}
	
	h = init_handle(req, module, req->context, req->callback);
	if (!h) {
		return LDB_ERR_OPERATIONS_ERROR;
	}
	ac = talloc_get_type(h->private_data, struct sort_context);

	sort_ctrls = talloc_get_type(control->data, struct ldb_server_sort_control *);
	if (!sort_ctrls) {
		return LDB_ERR_PROTOCOL_ERROR;
	}

	/* FIXME: we do not support more than one attribute for sorting right now */
	/* FIXME: we need to check if the attribute type exist or return an error */
		
	if (sort_ctrls[1] != NULL) {
		if (control->critical) {
			struct ldb_reply *ares;

			ares = talloc_zero(req, struct ldb_reply);
			if (!ares)
				return LDB_ERR_OPERATIONS_ERROR;

			/* 53 = unwilling to perform */
			ares->type = LDB_REPLY_DONE;
			if ((ret = build_response(ares, &ares->controls, 53, "sort control is not complete yet")) != LDB_SUCCESS) {
				return ret;
			}

			h->status = LDB_ERR_UNSUPPORTED_CRITICAL_EXTENSION;
			h->state = LDB_ASYNC_DONE;
			ret = ac->up_callback(module->ldb, ac->up_context, ares);

			return ret;
		} else {
			/* just pass the call down and don't do any sorting */
			ldb_next_request(module, req);
		}
	}

	ac->attributeName = sort_ctrls[0]->attributeName;
	ac->orderingRule = sort_ctrls[0]->orderingRule;
	ac->reverse = sort_ctrls[0]->reverse;

	ac->req = talloc(req, struct ldb_request);
	if (!ac->req)
		return LDB_ERR_OPERATIONS_ERROR;

	ac->req->operation = req->operation;
	ac->req->op.search.base = req->op.search.base;
	ac->req->op.search.scope = req->op.search.scope;
	ac->req->op.search.tree = req->op.search.tree;
	ac->req->op.search.attrs = req->op.search.attrs;
	ac->req->controls = req->controls;

	/* save it locally and remove it from the list */
	/* we do not need to replace them later as we
	 * are keeping the original req intact */
	if (!save_controls(control, ac->req, &saved_controls)) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ac->req->context = ac;
	ac->req->callback = server_sort_search_callback;
	ldb_set_timeout_from_prev_req(module->ldb, req, ac->req);

	req->handle = h;

	return ldb_next_request(module, ac->req);
}

static int server_sort_results(struct ldb_handle *handle)
{
	struct sort_context *ac;
	struct ldb_reply *ares;
	int i, ret;

	ac = talloc_get_type(handle->private_data, struct sort_context);

	ac->h = ldb_attrib_handler(ac->module->ldb, ac->attributeName);
	ac->sort_result = 0;

	ldb_qsort(ac->msgs, ac->num_msgs,
		  sizeof(struct ldb_message *),
		  ac, (ldb_qsort_cmp_fn_t)sort_compare);

	for (i = 0; i < ac->num_msgs; i++) {
		ares = talloc_zero(ac, struct ldb_reply);
		if (!ares) {
			handle->status = LDB_ERR_OPERATIONS_ERROR;
			return handle->status;
		}

		ares->type = LDB_REPLY_ENTRY;
		ares->message = talloc_move(ares, &ac->msgs[i]);
		
		handle->status = ac->up_callback(ac->module->ldb, ac->up_context, ares);
		if (handle->status != LDB_SUCCESS) {
			return handle->status;
		}
	}

	for (i = 0; i < ac->num_refs; i++) {
		ares = talloc_zero(ac, struct ldb_reply);
		if (!ares) {
			handle->status = LDB_ERR_OPERATIONS_ERROR;
			return handle->status;
		}

		ares->type = LDB_REPLY_REFERRAL;
		ares->referral = talloc_move(ares, &ac->referrals[i]);
		
		handle->status = ac->up_callback(ac->module->ldb, ac->up_context, ares);
		if (handle->status != LDB_SUCCESS) {
			return handle->status;
		}
	}

	ares = talloc_zero(ac, struct ldb_reply);
	if (!ares) {
		handle->status = LDB_ERR_OPERATIONS_ERROR;
		return handle->status;
	}

	ares->type = LDB_REPLY_DONE;
	ares->controls = talloc_move(ares, &ac->controls);
		
	handle->status = ac->up_callback(ac->module->ldb, ac->up_context, ares);
	if (handle->status != LDB_SUCCESS) {
		return handle->status;
	}

	if ((ret = build_response(ac, &ac->controls, ac->sort_result, "sort control is not complete yet")) != LDB_SUCCESS) {
		return ret;
	}

	return LDB_SUCCESS;
}

static int server_sort_wait(struct ldb_handle *handle, enum ldb_wait_type type)
{
	struct sort_context *ac;
	int ret;
    
	if (!handle || !handle->private_data) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ac = talloc_get_type(handle->private_data, struct sort_context);

	ret = ldb_wait(ac->req->handle, type);

	if (ret != LDB_SUCCESS) {
		handle->status = ret;
		return ret;
	}
		
	handle->state = ac->req->handle->state;
	handle->status = ac->req->handle->status;

	if (handle->status != LDB_SUCCESS) {
		return handle->status;
	}

	if (handle->state == LDB_ASYNC_DONE) {
		ret = server_sort_results(handle);
	}

	return ret;
}

static int server_sort_init(struct ldb_module *module)
{
	struct ldb_request *req;
	int ret;

	req = talloc(module, struct ldb_request);
	if (req == NULL) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	req->operation = LDB_REQ_REGISTER_CONTROL;
	req->op.reg_control.oid = LDB_CONTROL_SERVER_SORT_OID;
	req->controls = NULL;

	ret = ldb_request(module->ldb, req);
	if (ret != LDB_SUCCESS) {
		ldb_debug(module->ldb, LDB_DEBUG_WARNING, "server_sort: Unable to register control with rootdse!\n");
	}

	talloc_free(req);
	return ldb_next_init(module);
}

static const struct ldb_module_ops server_sort_ops = {
	.name		   = "server_sort",
	.search            = server_sort_search,
	.wait              = server_sort_wait,
	.init_context	   = server_sort_init
};

int ldb_sort_init(void)
{
	return ldb_register_module(&server_sort_ops);
}