summaryrefslogtreecommitdiff
path: root/source4/lib/ldb/common/ldb_ldif.c
blob: cde21320a2dd353475ecebf86c2cd652f12ccce1 (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
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
/* 
   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 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, see <http://www.gnu.org/licenses/>.
*/

/*
 *  Name: ldb
 *
 *  Component: ldif routines
 *
 *  Description: ldif pack/unpack routines
 *
 *  Author: Andrew Tridgell
 */

/*
  see RFC2849 for the LDIF format definition
*/

#include "ldb_private.h"
#include "system/locale.h"

/*
  
*/
static int ldb_read_data_file(void *mem_ctx, struct ldb_val *value)
{
	struct stat statbuf;
	char *buf;
	int count, size, bytes;
	int ret;
	int f;
	const char *fname = (const char *)value->data;

	if (strncmp(fname, "file://", 7) != 0) {
		return LDB_ERR_INVALID_ATTRIBUTE_SYNTAX;
	}
	fname += 7;

	f = open(fname, O_RDONLY);
	if (f == -1) {
		return -1;
	}

	if (fstat(f, &statbuf) != 0) {
		ret = -1;
		goto done;
	}

	if (statbuf.st_size == 0) {
		ret = -1;
		goto done;
	}

	value->data = (uint8_t *)talloc_size(mem_ctx, statbuf.st_size + 1);
	if (value->data == NULL) {
		ret = -1;
		goto done;
	}
	value->data[statbuf.st_size] = 0;

	count = 0;
	size = statbuf.st_size;
	buf = (char *)value->data;
	while (count < statbuf.st_size) {
		bytes = read(f, buf, size);
		if (bytes == -1) {
			talloc_free(value->data);
			ret = -1;
			goto done;
		}
		count += bytes;
		buf += bytes;
		size -= bytes;
	}

	value->length = statbuf.st_size;
	ret = statbuf.st_size;

done:
	close(f);
	return ret;
}

/*
  this base64 decoder was taken from jitterbug (written by tridge).
  we might need to replace it with a new version
*/
int ldb_base64_decode(char *s)
{
	const char *b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	int bit_offset=0, byte_offset, idx, i, n;
	uint8_t *d = (uint8_t *)s;
	char *p=NULL;

	n=i=0;

	while (*s && (p=strchr(b64,*s))) {
		idx = (int)(p - b64);
		byte_offset = (i*6)/8;
		bit_offset = (i*6)%8;
		d[byte_offset] &= ~((1<<(8-bit_offset))-1);
		if (bit_offset < 3) {
			d[byte_offset] |= (idx << (2-bit_offset));
			n = byte_offset+1;
		} else {
			d[byte_offset] |= (idx >> (bit_offset-2));
			d[byte_offset+1] = 0;
			d[byte_offset+1] |= (idx << (8-(bit_offset-2))) & 0xFF;
			n = byte_offset+2;
		}
		s++; i++;
	}
	if (bit_offset >= 3) {
		n--;
	}

	if (*s && !p) {
		/* the only termination allowed */
		if (*s != '=') {
			return -1;
		}
	}

	/* null terminate */
	d[n] = 0;
	return n;
}


/*
  encode as base64
  caller frees
*/
char *ldb_base64_encode(void *mem_ctx, const char *buf, int len)
{
	const char *b64 = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
	int bit_offset, byte_offset, idx, i;
	const uint8_t *d = (const uint8_t *)buf;
	int bytes = (len*8 + 5)/6, pad_bytes = (bytes % 4) ? 4 - (bytes % 4) : 0;
	char *out;

	out = talloc_array(mem_ctx, char, bytes+pad_bytes+1);
	if (!out) return NULL;

	for (i=0;i<bytes;i++) {
		byte_offset = (i*6)/8;
		bit_offset = (i*6)%8;
		if (bit_offset < 3) {
			idx = (d[byte_offset] >> (2-bit_offset)) & 0x3F;
		} else {
			idx = (d[byte_offset] << (bit_offset-2)) & 0x3F;
			if (byte_offset+1 < len) {
				idx |= (d[byte_offset+1] >> (8-(bit_offset-2)));
			}
		}
		out[i] = b64[idx];
	}

	for (;i<bytes+pad_bytes;i++)
		out[i] = '=';
	out[i] = 0;

	return out;
}

/*
  see if a buffer should be base64 encoded
*/
int ldb_should_b64_encode(struct ldb_context *ldb, const struct ldb_val *val)
{
	unsigned int i;
	uint8_t *p = val->data;

	if (ldb->flags & LDB_FLG_SHOW_BINARY) {
		return 0;
	}

	if (val->length == 0) {
		return 0;
	}

	if (p[0] == ' ' || p[0] == ':') {
		return 1;
	}

	for (i=0; i<val->length; i++) {
		if (!isprint(p[i]) || p[i] == '\n') {
			return 1;
		}
	}
	return 0;
}

/* this macro is used to handle the return checking on fprintf_fn() */
#define CHECK_RET do { if (ret < 0) return ret; total += ret; } while (0)

/*
  write a line folded string onto a file
*/
static int fold_string(int (*fprintf_fn)(void *, const char *, ...), void *private_data,
			const char *buf, size_t length, int start_pos)
{
	unsigned int i;
	int total=0, ret;

	for (i=0;i<length;i++) {
		ret = fprintf_fn(private_data, "%c", buf[i]);
		CHECK_RET;
		if (i != (length-1) && (i + start_pos) % 77 == 0) {
			ret = fprintf_fn(private_data, "\n ");
			CHECK_RET;
		}
	}

	return total;
}

#undef CHECK_RET

/*
  encode as base64 to a file
*/
static int base64_encode_f(struct ldb_context *ldb,
			   int (*fprintf_fn)(void *, const char *, ...), 
			   void *private_data,
			   const char *buf, int len, int start_pos)
{
	char *b = ldb_base64_encode(ldb, buf, len);
	int ret;

	if (!b) {
		return -1;
	}

	ret = fold_string(fprintf_fn, private_data, b, strlen(b), start_pos);

	talloc_free(b);
	return ret;
}


static const struct {
	const char *name;
	enum ldb_changetype changetype;
} ldb_changetypes[] = {
	{"add",    LDB_CHANGETYPE_ADD},
	{"delete", LDB_CHANGETYPE_DELETE},
	{"modify", LDB_CHANGETYPE_MODIFY},
	{NULL, 0}
};

/* this macro is used to handle the return checking on fprintf_fn() */
#define CHECK_RET do { if (ret < 0) { talloc_free(mem_ctx); return ret; } total += ret; } while (0)

/*
  write to ldif, using a caller supplied write method
*/
int ldb_ldif_write(struct ldb_context *ldb,
		   int (*fprintf_fn)(void *, const char *, ...), 
		   void *private_data,
		   const struct ldb_ldif *ldif)
{
	TALLOC_CTX *mem_ctx;
	unsigned int i, j;
	int total=0, ret;
	char *p;
	const struct ldb_message *msg;

	mem_ctx = talloc_named_const(NULL, 0, "ldb_ldif_write");

	msg = ldif->msg;
	p = ldb_dn_get_extended_linearized(mem_ctx, msg->dn, 1);
	ret = fprintf_fn(private_data, "dn: %s\n", p);
	talloc_free(p);
	CHECK_RET;

	if (ldif->changetype != LDB_CHANGETYPE_NONE) {
		for (i=0;ldb_changetypes[i].name;i++) {
			if (ldb_changetypes[i].changetype == ldif->changetype) {
				break;
			}
		}
		if (!ldb_changetypes[i].name) {
			ldb_debug(ldb, LDB_DEBUG_ERROR, "Error: Invalid ldif changetype %d",
				  ldif->changetype);
			talloc_free(mem_ctx);
			return -1;
		}
		ret = fprintf_fn(private_data, "changetype: %s\n", ldb_changetypes[i].name);
		CHECK_RET;
	}

	for (i=0;i<msg->num_elements;i++) {
		const struct ldb_schema_attribute *a;

		a = ldb_schema_attribute_by_name(ldb, msg->elements[i].name);

		if (ldif->changetype == LDB_CHANGETYPE_MODIFY) {
			switch (msg->elements[i].flags & LDB_FLAG_MOD_MASK) {
			case LDB_FLAG_MOD_ADD:
				fprintf_fn(private_data, "add: %s\n", 
					   msg->elements[i].name);
				break;
			case LDB_FLAG_MOD_DELETE:
				fprintf_fn(private_data, "delete: %s\n", 
					   msg->elements[i].name);
				break;
			case LDB_FLAG_MOD_REPLACE:
				fprintf_fn(private_data, "replace: %s\n", 
					   msg->elements[i].name);
				break;
			}
		}

		for (j=0;j<msg->elements[i].num_values;j++) {
			struct ldb_val v;
			ret = a->syntax->ldif_write_fn(ldb, mem_ctx, &msg->elements[i].values[j], &v);
			if (ret != LDB_SUCCESS) {
				v = msg->elements[i].values[j];
			}
			if (ret != LDB_SUCCESS || ldb_should_b64_encode(ldb, &v)) {
				ret = fprintf_fn(private_data, "%s:: ", 
						 msg->elements[i].name);
				CHECK_RET;
				ret = base64_encode_f(ldb, fprintf_fn, private_data, 
						      (char *)v.data, v.length,
						      strlen(msg->elements[i].name)+3);
				CHECK_RET;
				ret = fprintf_fn(private_data, "\n");
				CHECK_RET;
			} else {
				ret = fprintf_fn(private_data, "%s: ", msg->elements[i].name);
				CHECK_RET;
				if (ldb->flags & LDB_FLG_SHOW_BINARY) {
					ret = fprintf_fn(private_data, "%*.*s", 
							 v.length, v.length, (char *)v.data);
				} else {
					ret = fold_string(fprintf_fn, private_data,
							  (char *)v.data, v.length,
							  strlen(msg->elements[i].name)+2);
				}
				CHECK_RET;
				ret = fprintf_fn(private_data, "\n");
				CHECK_RET;
			}
			if (v.data != msg->elements[i].values[j].data) {
				talloc_free(v.data);
			}
		}
		if (ldif->changetype == LDB_CHANGETYPE_MODIFY) {
			fprintf_fn(private_data, "-\n");
		}
	}
	ret = fprintf_fn(private_data,"\n");
	CHECK_RET;

	return total;
}

#undef CHECK_RET


/*
  pull a ldif chunk, which is defined as a piece of data ending in \n\n or EOF
  this routine removes any RFC2849 continuations and comments

  caller frees
*/
static char *next_chunk(struct ldb_context *ldb, 
			int (*fgetc_fn)(void *), void *private_data)
{
	size_t alloc_size=0, chunk_size = 0;
	char *chunk = NULL;
	int c;
	int in_comment = 0;

	while ((c = fgetc_fn(private_data)) != EOF) {
		if (chunk_size+1 >= alloc_size) {
			char *c2;
			alloc_size += 1024;
			c2 = talloc_realloc(ldb, chunk, char, alloc_size);
			if (!c2) {
				talloc_free(chunk);
				errno = ENOMEM;
				return NULL;
			}
			chunk = c2;
		}

		if (in_comment) {
			if (c == '\n') {
				in_comment = 0;
			}
			continue;			
		}
		
		/* handle continuation lines - see RFC2849 */
		if (c == ' ' && chunk_size > 1 && chunk[chunk_size-1] == '\n') {
			chunk_size--;
			continue;
		}
		
		/* chunks are terminated by a double line-feed */
		if (c == '\n' && chunk_size > 0 && chunk[chunk_size-1] == '\n') {
			chunk[chunk_size-1] = 0;
			return chunk;
		}

		if (c == '#' && (chunk_size == 0 || chunk[chunk_size-1] == '\n')) {
			in_comment = 1;
			continue;
		}

		/* ignore leading blank lines */
		if (chunk_size == 0 && c == '\n') {
			continue;
		}

		chunk[chunk_size++] = c;
	}

	if (chunk) {
		chunk[chunk_size] = 0;
	}

	return chunk;
}


/* simple ldif attribute parser */
static int next_attr(void *mem_ctx, char **s, const char **attr, struct ldb_val *value)
{
	char *p;
	int base64_encoded = 0;
	int binary_file = 0;

	if (strncmp(*s, "-\n", 2) == 0) {
		value->length = 0;
		*attr = "-";
		*s += 2;
		return 0;
	}

	p = strchr(*s, ':');
	if (!p) {
		return -1;
	}

	*p++ = 0;

	if (*p == ':') {
		base64_encoded = 1;
		p++;
	}

	if (*p == '<') {
		binary_file = 1;
		p++;
	}

	*attr = *s;

	while (*p == ' ' || *p == '\t') {
		p++;
	}

	value->data = (uint8_t *)p;

	p = strchr(p, '\n');

	if (!p) {
		value->length = strlen((char *)value->data);
		*s = ((char *)value->data) + value->length;
	} else {
		value->length = p - (char *)value->data;
		*s = p+1;
		*p = 0;
	}

	if (base64_encoded) {
		int len = ldb_base64_decode((char *)value->data);
		if (len == -1) {
			/* it wasn't valid base64 data */
			return -1;
		}
		value->length = len;
	}

	if (binary_file) {
		int len = ldb_read_data_file(mem_ctx, value);
		if (len == -1) {
			/* an error occured hile trying to retrieve the file */
			return -1;
		}
	}

	return 0;
}


/*
  free a message from a ldif_read
*/
void ldb_ldif_read_free(struct ldb_context *ldb, struct ldb_ldif *ldif)
{
	talloc_free(ldif);
}

/*
 read from a LDIF source, creating a ldb_message
*/
struct ldb_ldif *ldb_ldif_read(struct ldb_context *ldb,
			       int (*fgetc_fn)(void *), void *private_data)
{
	struct ldb_ldif *ldif;
	struct ldb_message *msg;
	const char *attr=NULL;
	char *chunk=NULL, *s;
	struct ldb_val value;
	unsigned flags = 0;

	value.data = NULL;

	ldif = talloc(ldb, struct ldb_ldif);
	if (!ldif) return NULL;

	ldif->msg = talloc(ldif, struct ldb_message);
	if (ldif->msg == NULL) {
		talloc_free(ldif);
		return NULL;
	}

	ldif->changetype = LDB_CHANGETYPE_NONE;
	msg = ldif->msg;

	msg->dn = NULL;
	msg->elements = NULL;
	msg->num_elements = 0;

	chunk = next_chunk(ldb, fgetc_fn, private_data);
	if (!chunk) {
		goto failed;
	}
	talloc_steal(ldif, chunk);

	s = chunk;

	if (next_attr(ldif, &s, &attr, &value) != 0) {
		goto failed;
	}
	
	/* first line must be a dn */
	if (ldb_attr_cmp(attr, "dn") != 0) {
		ldb_debug(ldb, LDB_DEBUG_ERROR, "Error: First line of ldif must be a dn not '%s'",
			  attr);
		goto failed;
	}

	msg->dn = ldb_dn_from_ldb_val(msg, ldb, &value);

	if ( ! ldb_dn_validate(msg->dn)) {
		ldb_debug(ldb, LDB_DEBUG_ERROR, "Error: Unable to parse dn '%s'",
			  (char *)value.data);
		goto failed;
	}

	while (next_attr(ldif, &s, &attr, &value) == 0) {
		const struct ldb_schema_attribute *a;
		struct ldb_message_element *el;
		int ret, empty = 0;

		if (ldb_attr_cmp(attr, "changetype") == 0) {
			int i;
			for (i=0;ldb_changetypes[i].name;i++) {
				if (ldb_attr_cmp((char *)value.data, ldb_changetypes[i].name) == 0) {
					ldif->changetype = ldb_changetypes[i].changetype;
					break;
				}
			}
			if (!ldb_changetypes[i].name) {
				ldb_debug(ldb, LDB_DEBUG_ERROR,
					  "Error: Bad ldif changetype '%s'",(char *)value.data);
			}
			flags = 0;
			continue;
		}

		if (ldb_attr_cmp(attr, "add") == 0) {
			flags = LDB_FLAG_MOD_ADD;
			empty = 1;
		}
		if (ldb_attr_cmp(attr, "delete") == 0) {
			flags = LDB_FLAG_MOD_DELETE;
			empty = 1;
		}
		if (ldb_attr_cmp(attr, "replace") == 0) {
			flags = LDB_FLAG_MOD_REPLACE;
			empty = 1;
		}
		if (ldb_attr_cmp(attr, "-") == 0) {
			flags = 0;
			continue;
		}

		if (empty) {
			if (ldb_msg_add_empty(msg, (char *)value.data, flags, NULL) != 0) {
				goto failed;
			}
			continue;
		}
		
		el = &msg->elements[msg->num_elements-1];

		a = ldb_schema_attribute_by_name(ldb, attr);

		if (msg->num_elements > 0 && ldb_attr_cmp(attr, el->name) == 0 &&
		    flags == el->flags) {
			/* its a continuation */
			el->values = 
				talloc_realloc(msg->elements, el->values, 
						 struct ldb_val, el->num_values+1);
			if (!el->values) {
				goto failed;
			}
			ret = a->syntax->ldif_read_fn(ldb, el->values, &value, &el->values[el->num_values]);
			if (ret != 0) {
				goto failed;
			}
			if (value.length == 0) {
				ldb_debug(ldb, LDB_DEBUG_ERROR,
					  "Error: Attribute value cannot be empty for attribute '%s'", el->name);
				goto failed;
			}
			if (value.data != el->values[el->num_values].data) {
				talloc_steal(el->values, el->values[el->num_values].data);
			}
			el->num_values++;
		} else {
			/* its a new attribute */
			msg->elements = talloc_realloc(msg, msg->elements, 
							 struct ldb_message_element, 
							 msg->num_elements+1);
			if (!msg->elements) {
				goto failed;
			}
			el = &msg->elements[msg->num_elements];
			el->flags = flags;
			el->name = talloc_strdup(msg->elements, attr);
			el->values = talloc(msg->elements, struct ldb_val);
			if (!el->values || !el->name) {
				goto failed;
			}
			el->num_values = 1;
			ret = a->syntax->ldif_read_fn(ldb, el->values, &value, &el->values[0]);
			if (ret != 0) {
				goto failed;
			}
			if (value.data != el->values[0].data) {
				talloc_steal(el->values, el->values[0].data);
			}
			msg->num_elements++;
		}
	}

	return ldif;

failed:
	talloc_free(ldif);
	return NULL;
}



/*
  a wrapper around ldif_read() for reading from FILE*
*/
struct ldif_read_file_state {
	FILE *f;
};

static int fgetc_file(void *private_data)
{
	struct ldif_read_file_state *state =
		(struct ldif_read_file_state *)private_data;
	return fgetc(state->f);
}

struct ldb_ldif *ldb_ldif_read_file(struct ldb_context *ldb, FILE *f)
{
	struct ldif_read_file_state state;
	state.f = f;
	return ldb_ldif_read(ldb, fgetc_file, &state);
}


/*
  a wrapper around ldif_read() for reading from const char*
*/
struct ldif_read_string_state {
	const char *s;
};

static int fgetc_string(void *private_data)
{
	struct ldif_read_string_state *state =
		(struct ldif_read_string_state *)private_data;
	if (state->s[0] != 0) {
		return *state->s++;
	}
	return EOF;
}

struct ldb_ldif *ldb_ldif_read_string(struct ldb_context *ldb, const char **s)
{
	struct ldif_read_string_state state;
	struct ldb_ldif *ldif;
	state.s = *s;
	ldif = ldb_ldif_read(ldb, fgetc_string, &state);
	*s = state.s;
	return ldif;
}


/*
  wrapper around ldif_write() for a file
*/
struct ldif_write_file_state {
	FILE *f;
};

static int fprintf_file(void *private_data, const char *fmt, ...) PRINTF_ATTRIBUTE(2, 3);

static int fprintf_file(void *private_data, const char *fmt, ...)
{
	struct ldif_write_file_state *state =
		(struct ldif_write_file_state *)private_data;
	int ret;
	va_list ap;

	va_start(ap, fmt);
	ret = vfprintf(state->f, fmt, ap);
	va_end(ap);
	return ret;
}

int ldb_ldif_write_file(struct ldb_context *ldb, FILE *f, const struct ldb_ldif *ldif)
{
	struct ldif_write_file_state state;
	state.f = f;
	return ldb_ldif_write(ldb, fprintf_file, &state, ldif);
}

/*
  wrapper around ldif_write() for a string
*/
struct ldif_write_string_state {
	char *string;
};

static int ldif_printf_string(void *private_data, const char *fmt, ...) PRINTF_ATTRIBUTE(2, 3);

static int ldif_printf_string(void *private_data, const char *fmt, ...)
{
	struct ldif_write_string_state *state =
		(struct ldif_write_string_state *)private_data;
	va_list ap;
	size_t oldlen = strlen(state->string);
	va_start(ap, fmt);
	
	state->string = talloc_vasprintf_append(state->string, fmt, ap);
	va_end(ap);
	if (!state->string) {
		return -1;
	}
		
	return strlen(state->string) - oldlen;
}

char *ldb_ldif_write_string(struct ldb_context *ldb, TALLOC_CTX *mem_ctx, 
			    const struct ldb_ldif *ldif)
{
	struct ldif_write_string_state state;
	state.string = talloc_strdup(mem_ctx, "");
	if (!state.string) {
		return NULL;
	}
	if (ldb_ldif_write(ldb, ldif_printf_string, &state, ldif) == -1) {
		return NULL;
	}
	return state.string;
}

/*
  convenient function to turn a ldb_message into a string. Useful for
  debugging
 */
char *ldb_ldif_message_string(struct ldb_context *ldb, TALLOC_CTX *mem_ctx, 
			      enum ldb_changetype changetype,
			      const struct ldb_message *msg)
{
	struct ldb_ldif ldif;

	ldif.changetype = changetype;
	ldif.msg = discard_const_p(struct ldb_message, msg);

	return ldb_ldif_write_string(ldb, mem_ctx, &ldif);
}