summaryrefslogtreecommitdiff
path: root/source4/lib/ldb/common/ldb.c
blob: 68e3c116fc7b347fb69842d588e3340ec63e490c (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
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
/* 
   ldb database library

   Copyright (C) Andrew Tridgell  2004

     ** 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 2 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 core API
 *
 *  Description: core API routines interfacing to ldb backends
 *
 *  Author: Andrew Tridgell
 */

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

/* 
   initialise a ldb context
   The mem_ctx is optional
*/
struct ldb_context *ldb_init(void *mem_ctx)
{
	struct ldb_context *ldb = talloc_zero(mem_ctx, struct ldb_context);
	int ret;

	ret = ldb_setup_wellknown_attributes(ldb);
	if (ret != 0) {
		talloc_free(ldb);
		return NULL;
	}

	ldb_set_utf8_default(ldb);

	return ldb;
}

static struct ldb_backend {
	const char *name;
	ldb_connect_fn connect_fn;
	struct ldb_backend *prev, *next;
} *ldb_backends = NULL;
/*
 register a new ldb backend
*/
int ldb_register_backend(const char *url_prefix, ldb_connect_fn connectfn)
{
	struct ldb_backend *backend = talloc(talloc_autofree_context(), struct ldb_backend);

	/* Maybe check for duplicity here later on? */

	backend->name = talloc_strdup(backend, url_prefix);
	backend->connect_fn = connectfn;
	DLIST_ADD(ldb_backends, backend);

	return LDB_SUCCESS;
}

static ldb_connect_fn ldb_find_backend(const char *url)
{
	struct ldb_backend *backend;

	for (backend = ldb_backends; backend; backend = backend->next) {
		if (strncmp(backend->name, url, strlen(backend->name)) == 0) {
			return backend->connect_fn;
		}
	}

	return NULL;
}

/* 
 connect to a database. The URL can either be one of the following forms
   ldb://path
   ldapi://path

   flags is made up of LDB_FLG_*

   the options are passed uninterpreted to the backend, and are
   backend specific
*/
int ldb_connect(struct ldb_context *ldb, const char *url, unsigned int flags, const char *options[])
{
	int ret;
	char *backend;
	ldb_connect_fn fn;

	if (strchr(url, ':') != NULL) {
		backend = talloc_strndup(ldb, url, strchr(url, ':')-url);
	} else {
		/* Default to tdb */
		backend = talloc_strdup(ldb, "tdb");
	}

	fn = ldb_find_backend(backend);

	if (fn == NULL) {
		if (ldb_try_load_dso(ldb, backend) == 0) {
			fn = ldb_find_backend(backend);
		}
	}

	talloc_free(backend);

	if (fn == NULL) {
		ldb_debug(ldb, LDB_DEBUG_FATAL, "Unable to find backend for '%s'\n", url);
		return LDB_ERR_OTHER;
	}

	ret = fn(ldb, url, flags, options);

	if (ret != LDB_SUCCESS) {
		ldb_debug(ldb, LDB_DEBUG_ERROR, "Failed to connect to '%s'\n", url);
		return ret;
	}

	if (ldb_load_modules(ldb, options) != LDB_SUCCESS) {
		ldb_debug(ldb, LDB_DEBUG_FATAL, "Unable to load modules for '%s'\n", url);
		return LDB_ERR_OTHER;
	}

	return LDB_SUCCESS;
}

void ldb_set_errstring(struct ldb_context *ldb, char *err_string)
{
	if (ldb->err_string) {
		talloc_free(ldb->err_string);
	}
	ldb->err_string = talloc_steal(ldb, err_string);
}

void ldb_reset_err_string(struct ldb_context *ldb)
{
	if (ldb->err_string) {
		talloc_free(ldb->err_string);
		ldb->err_string = NULL;
	}
}

#define FIRST_OP(ldb, op) do { \
	module = ldb->modules; \
	while (module && module->ops->op == NULL) module = module->next; \
	if (module == NULL) return LDB_ERR_OPERATIONS_ERROR; \
} while (0)

/*
  start a transaction
*/
int ldb_transaction_start(struct ldb_context *ldb)
{
	struct ldb_module *module;
	int status;
	FIRST_OP(ldb, start_transaction);
	
	ldb->transaction_active++;

	ldb_reset_err_string(ldb);

	status = module->ops->start_transaction(module);
	if (status != LDB_SUCCESS) {
		if (ldb->err_string == NULL) {
			/* no error string was setup by the backend */
			ldb_set_errstring(ldb, 
					  talloc_asprintf(ldb, "ldb transaction start error %d", status));
		}
	}
	return status;
}

/*
  commit a transaction
*/
int ldb_transaction_commit(struct ldb_context *ldb)
{
	struct ldb_module *module;
	int status;
	FIRST_OP(ldb, end_transaction);

	if (ldb->transaction_active > 0) {
		ldb->transaction_active--;
	} else {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	ldb_reset_err_string(ldb);

	status = module->ops->end_transaction(module);
	if (status != LDB_SUCCESS) {
		if (ldb->err_string == NULL) {
			/* no error string was setup by the backend */
			ldb_set_errstring(ldb, 
					  talloc_asprintf(ldb, "ldb transaction commit error %d", status));
		}
	}
	return status;
}

/*
  cancel a transaction
*/
int ldb_transaction_cancel(struct ldb_context *ldb)
{
	struct ldb_module *module;
	int status;
	FIRST_OP(ldb, del_transaction);

	if (ldb->transaction_active > 0) {
		ldb->transaction_active--;
	} else {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	status = module->ops->del_transaction(module);
	if (status != LDB_SUCCESS) {
		if (ldb->err_string == NULL) {
			/* no error string was setup by the backend */
			ldb_set_errstring(ldb, 
					  talloc_asprintf(ldb, "ldb transaction cancel error %d", status));
		}
	}
	return status;
}

int ldb_async_wait(struct ldb_async_handle *handle, enum ldb_async_wait_type type)
{
	if (!handle) {
		return LDB_SUCCESS;
	}

	return handle->module->ops->async_wait(handle, type);
}

/*
  check for an error return from an op 
  if an op fails, but has not setup an error string, then setup one now
*/
static int ldb_op_finish(struct ldb_context *ldb, int status)
{
	if (status == LDB_SUCCESS) {
		return ldb_transaction_commit(ldb);
	}
	if (ldb->err_string == NULL) {
		/* no error string was setup by the backend */
		ldb_set_errstring(ldb, 
				  talloc_asprintf(ldb, "ldb error %d", status));
	}
	ldb_transaction_cancel(ldb);
	return status;
}

/*
  start an ldb request
  autostarts a transacion if none active and the operation is not a search
  NOTE: the request must be a talloc context.
  returns LDB_ERR_* on errors.
*/
int ldb_request(struct ldb_context *ldb, struct ldb_request *req)
{
	int status, started_transaction=0;

	ldb_reset_err_string(ldb);

	if (req->operation == LDB_REQ_SEARCH) {
		req->op.search.res = NULL;
	}

	/* start a transaction if needed */
	if ((!ldb->transaction_active) &&
	    (req->operation == LDB_REQ_ADD ||
	     req->operation == LDB_REQ_MODIFY ||
	     req->operation == LDB_REQ_DELETE ||
	     req->operation == LDB_REQ_RENAME)) {
		status = ldb_transaction_start(ldb);
		if (status != LDB_SUCCESS) {
			talloc_free(req);
			return status;
		}
		started_transaction = 1;
	}

	/* call the first module in the chain */
	status = ldb->modules->ops->request(ldb->modules, req);

	if (started_transaction) {
		return ldb_op_finish(ldb, status);
	}

	return status;
}

/*
  search the database given a LDAP-like search expression

  returns an LDB error code

  Use talloc_free to free the ldb_message returned in 'res', if successful

*/
int ldb_search(struct ldb_context *ldb, 
	       const struct ldb_dn *base,
	       enum ldb_scope scope,
	       const char *expression,
	       const char * const *attrs, 
	       struct ldb_result **res)
{
	struct ldb_request *req;
	int ret;

	(*res) = NULL;

	req = talloc(ldb, struct ldb_request);
	if (req == NULL) {
		ldb_set_errstring(ldb, talloc_strdup(ldb, "Out of memory!"));
		return LDB_ERR_OPERATIONS_ERROR;
	}

	req->operation = LDB_REQ_SEARCH;
	req->op.search.base = base;
	req->op.search.scope = scope;

	req->op.search.tree = ldb_parse_tree(req, expression);
	if (req->op.search.tree == NULL) {
		ldb_set_errstring(ldb, talloc_strdup(ldb, "Unable to parse search expression"));
		talloc_free(req);
		return LDB_ERR_OPERATIONS_ERROR;
	}

	req->op.search.attrs = attrs;
	req->controls = NULL;

	ret = ldb_request(ldb, req);
	
	if (ret == LDB_SUCCESS) {
		(*res) = talloc_steal(ldb, req->op.search.res);
	}
	talloc_free(req);
	return ret;
}

/*
  add a record to the database. Will fail if a record with the given class and key
  already exists
*/
int ldb_add(struct ldb_context *ldb, 
	    const struct ldb_message *message)
{
	struct ldb_request *req;
	int ret;

	ret = ldb_msg_sanity_check(message);
	if (ret != LDB_SUCCESS) return ret;

	req = talloc(ldb, struct ldb_request);
	if (req == NULL) {
		ldb_set_errstring(ldb, talloc_strdup(ldb, "Out of memory!"));
		return LDB_ERR_OPERATIONS_ERROR;
	}

	req->operation = LDB_REQ_ADD;
	req->op.add.message = message;
	req->controls = NULL;

	ret = ldb_request(ldb, req);

	talloc_free(req);
	return ret;
}

/*
  modify the specified attributes of a record
*/
int ldb_modify(struct ldb_context *ldb, 
	       const struct ldb_message *message)
{
	struct ldb_request *req;
	int ret;

	ret = ldb_msg_sanity_check(message);
	if (ret != LDB_SUCCESS) return ret;

	req = talloc(ldb, struct ldb_request);
	if (req == NULL) {
		ldb_set_errstring(ldb, talloc_strdup(ldb, "Out of memory!"));
		return LDB_ERR_OPERATIONS_ERROR;
	}

	req->operation = LDB_REQ_MODIFY;
	req->op.add.message = message;
	req->controls = NULL;

	ret = ldb_request(ldb, req);

	talloc_free(req);
	return ret;
}


/*
  delete a record from the database
*/
int ldb_delete(struct ldb_context *ldb, const struct ldb_dn *dn)
{
	struct ldb_request *req;
	int ret;

	req = talloc(ldb, struct ldb_request);
	if (req == NULL) {
		ldb_set_errstring(ldb, talloc_strdup(ldb, "Out of memory!"));
		return LDB_ERR_OPERATIONS_ERROR;
	}

	req->operation = LDB_REQ_DELETE;
	req->op.del.dn = dn;
	req->controls = NULL;

	ret = ldb_request(ldb, req);

	talloc_free(req);
	return ret;
}

/*
  rename a record in the database
*/
int ldb_rename(struct ldb_context *ldb, const struct ldb_dn *olddn, const struct ldb_dn *newdn)
{
	struct ldb_request *req;
	int ret;

	req = talloc(ldb, struct ldb_request);
	if (req == NULL) {
		ldb_set_errstring(ldb, talloc_strdup(ldb, "Out of memory!"));
		return LDB_ERR_OPERATIONS_ERROR;
	}

	req->operation = LDB_REQ_RENAME;
	req->op.rename.olddn = olddn;
	req->op.rename.newdn = newdn;
	req->controls = NULL;

	ret = ldb_request(ldb, req);

	talloc_free(req);
	return ret;
}



/*
  return extended error information 
*/
const char *ldb_errstring(struct ldb_context *ldb)
{
	if (ldb->err_string) {
		return ldb->err_string;
	}

	return NULL;
}

/*
  return a string explaining what a ldb error constant meancs
*/
const char *ldb_strerror(int ldb_err)
{
	switch (ldb_err) {
	case LDB_SUCCESS:
		return "Success";
	case LDB_ERR_OPERATIONS_ERROR:
		return "Operations error";
	case LDB_ERR_PROTOCOL_ERROR:
		return "Protocol error";
	case LDB_ERR_TIME_LIMIT_EXCEEDED:
		return "Time limit exceeded";
	case LDB_ERR_SIZE_LIMIT_EXCEEDED:
		return "Size limit exceeded";
	case LDB_ERR_COMPARE_FALSE:
		return "Compare false";
	case LDB_ERR_COMPARE_TRUE:
		return "Compare true";
	case LDB_ERR_AUTH_METHOD_NOT_SUPPORTED:
		return "Auth method not supported";
	case LDB_ERR_STRONG_AUTH_REQUIRED:
		return "Strong auth required";
/* 9 RESERVED */
	case LDB_ERR_REFERRAL:
		return "Referral error";
	case LDB_ERR_ADMIN_LIMIT_EXCEEDED:
		return "Admin limit exceeded";
	case LDB_ERR_UNSUPPORTED_CRITICAL_EXTENSION:
		return "Unsupported critical extension";
	case LDB_ERR_CONFIDENTIALITY_REQUIRED:
		return "Confidentiality required";
	case LDB_ERR_SASL_BIND_IN_PROGRESS:
		return "SASL bind in progress";
	case LDB_ERR_NO_SUCH_ATTRIBUTE:
		return "No such attribute";
	case LDB_ERR_UNDEFINED_ATTRIBUTE_TYPE:
		return "Undefined attribute type";
	case LDB_ERR_INAPPROPRIATE_MATCHING:
		return "Inappropriate matching";
	case LDB_ERR_CONSTRAINT_VIOLATION:
		return "Constraint violation";
	case LDB_ERR_ATTRIBUTE_OR_VALUE_EXISTS:
		return "Attribute or value exists";
	case LDB_ERR_INVALID_ATTRIBUTE_SYNTAX:
		return "Invalid attribute syntax";
/* 22-31 unused */
	case LDB_ERR_NO_SUCH_OBJECT:
		return "No such object";
	case LDB_ERR_ALIAS_PROBLEM:
		return "Alias problem";
	case LDB_ERR_INVALID_DN_SYNTAX:
		return "Invalid DN syntax";
/* 35 RESERVED */
	case LDB_ERR_ALIAS_DEREFERENCING_PROBLEM:
		return "Alias dereferencing problem";
/* 37-47 unused */
	case LDB_ERR_INAPPROPRIATE_AUTHENTICATION:
		return "Inappropriate authentication";
	case LDB_ERR_INVALID_CREDENTIALS:
		return "Invalid credentials";
	case LDB_ERR_INSUFFICIENT_ACCESS_RIGHTS:
		return "insufficient access rights";
	case LDB_ERR_BUSY:
		return "Busy";
	case LDB_ERR_UNAVAILABLE:
		return "Unavailable";
	case LDB_ERR_UNWILLING_TO_PERFORM:
		return "Unwilling to perform";
	case LDB_ERR_LOOP_DETECT:
		return "Loop detect";
/* 55-63 unused */
	case LDB_ERR_NAMING_VIOLATION:
		return "Naming violation";
	case LDB_ERR_OBJECT_CLASS_VIOLATION:
		return "Object class violation";
	case LDB_ERR_NOT_ALLOWED_ON_NON_LEAF:
		return "Not allowed on non-leaf";
	case LDB_ERR_NOT_ALLOWED_ON_RDN:
		return "Not allowed on RDN";
	case LDB_ERR_ENTRY_ALREADY_EXISTS:
		return "Entry already exists";
	case LDB_ERR_OBJECT_CLASS_MODS_PROHIBITED:
		return "Object class mods prohibited";
/* 70 RESERVED FOR CLDAP */
	case LDB_ERR_AFFECTS_MULTIPLE_DSAS:
		return "Affects multiple DSAs";
/* 72-79 unused */
	case LDB_ERR_OTHER:
		return "Other";
	}

	return "Unknown error";
}

/*
  set backend specific opaque parameters
*/
int ldb_set_opaque(struct ldb_context *ldb, const char *name, void *value)
{
	struct ldb_opaque *o;

	/* allow updating an existing value */
	for (o=ldb->opaque;o;o=o->next) {
		if (strcmp(o->name, name) == 0) {
			o->value = value;
			return LDB_SUCCESS;
		}
	}

	o = talloc(ldb, struct ldb_opaque);
	if (o == NULL) {
		ldb_oom(ldb);
		return LDB_ERR_OTHER;
	}
	o->next = ldb->opaque;
	o->name = name;
	o->value = value;
	ldb->opaque = o;
	return LDB_SUCCESS;
}

/*
  get a previously set opaque value
*/
void *ldb_get_opaque(struct ldb_context *ldb, const char *name)
{
	struct ldb_opaque *o;
	for (o=ldb->opaque;o;o=o->next) {
		if (strcmp(o->name, name) == 0) {
			return o->value;
		}
	}
	return NULL;
}