summaryrefslogtreecommitdiff
path: root/source4/lib/ldb/common/ldb_attributes.c
blob: 79c5dd69de43f0485abaf6e9a1633fbcccb3fb4e (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
/* 
   ldb database library

   Copyright (C) Andrew Tridgell  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, see <http://www.gnu.org/licenses/>.
*/
/*
  register handlers for specific attributes and objectclass relationships

  this allows a backend to store its schema information in any format
  it likes (or to not have any schema information at all) while keeping the 
  message matching logic generic
*/

#include "ldb_private.h"
#include "ldb_handlers.h"

/*
  add a attribute to the ldb_schema

  if flags contains LDB_ATTR_FLAG_ALLOCATED
  the attribute name string will be copied using
  talloc_strdup(), otherwise it needs to be a static const
  string at least with a lifetime longer than the ldb struct!
  
  the ldb_schema_syntax structure should be a pointer
  to a static const struct or at least it needs to be
  a struct with a longer lifetime than the ldb context!

*/
int ldb_schema_attribute_add_with_syntax(struct ldb_context *ldb, 
					 const char *attribute,
					 unsigned flags,
					 const struct ldb_schema_syntax *syntax)
{
	int i, n;
	struct ldb_schema_attribute *a;

	if (!syntax) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	n = ldb->schema.num_attributes + 1;

	a = talloc_realloc(ldb, ldb->schema.attributes,
			   struct ldb_schema_attribute, n);
	if (a == NULL) {
		ldb_oom(ldb);
		return -1;
	}
	ldb->schema.attributes = a;

	for (i = 0; i < ldb->schema.num_attributes; i++) {
		int cmp = ldb_attr_cmp(attribute, a[i].name);
		if (cmp == 0) {
			/* silently ignore attempts to overwrite fixed attributes */
			if (a[i].flags & LDB_ATTR_FLAG_FIXED) {
				return 0;
			}
			if (a[i].flags & LDB_ATTR_FLAG_ALLOCATED) {
				talloc_free(discard_const_p(char, a[i].name));
			}
			/* To cancel out increment below */
			ldb->schema.num_attributes--;
			break;
		} else if (cmp < 0) {
			memmove(a+i+1, a+i, sizeof(*a) * (ldb->schema.num_attributes-i));
			break;
		}
	}
	ldb->schema.num_attributes++;

	a[i].name	= attribute;
	a[i].flags	= flags;
	a[i].syntax	= syntax;

	if (a[i].flags & LDB_ATTR_FLAG_ALLOCATED) {
		a[i].name = talloc_strdup(a, a[i].name);
		if (a[i].name == NULL) {
			ldb_oom(ldb);
			return -1;
		}
	}

	return 0;
}

static const struct ldb_schema_syntax ldb_syntax_default = {
	.name            = LDB_SYNTAX_OCTET_STRING,
	.ldif_read_fn    = ldb_handler_copy,
	.ldif_write_fn   = ldb_handler_copy,
	.canonicalise_fn = ldb_handler_copy,
	.comparison_fn   = ldb_comparison_binary
};

static const struct ldb_schema_attribute ldb_attribute_default = {
	.name	= NULL,
	.flags	= 0,
	.syntax	= &ldb_syntax_default
};

/*
  return the attribute handlers for a given attribute
*/
static const struct ldb_schema_attribute *ldb_schema_attribute_by_name_internal(
	struct ldb_context *ldb,
	const char *name)
{
	int i, e, b = 0, r;
	const struct ldb_schema_attribute *def = &ldb_attribute_default;

	/* as handlers are sorted, '*' must be the first if present */
	if (strcmp(ldb->schema.attributes[0].name, "*") == 0) {
		def = &ldb->schema.attributes[0];
		b = 1;
	}

	/* do a binary search on the array */
	e = ldb->schema.num_attributes - 1;

	while (b <= e) {

		i = (b + e) / 2;

		r = ldb_attr_cmp(name, ldb->schema.attributes[i].name);
		if (r == 0) {
			return &ldb->schema.attributes[i];
		}
		if (r < 0) {
			e = i - 1;
		} else {
			b = i + 1;
		}

	}

	return def;
}

/*
  return the attribute handlers for a given attribute
*/
const struct ldb_schema_attribute *ldb_schema_attribute_by_name(struct ldb_context *ldb,
								const char *name)
{
	if (ldb->schema.attribute_handler_override) {
		const struct ldb_schema_attribute *ret = 
			ldb->schema.attribute_handler_override(ldb, 
							       ldb->schema.attribute_handler_override_private,
							       name);
		if (ret) {
			return ret;
		}
	}

	return ldb_schema_attribute_by_name_internal(ldb, name);
}


/*
  add to the list of ldif handlers for this ldb context
*/
void ldb_schema_attribute_remove(struct ldb_context *ldb, const char *name)
{
	const struct ldb_schema_attribute *a;
	int i;

	a = ldb_schema_attribute_by_name_internal(ldb, name);
	if (a == NULL || a->name == NULL) {
		return;
	}

	/* FIXED attributes are never removed */
	if (a->flags & LDB_ATTR_FLAG_FIXED) {
		return;
	}

	if (a->flags & LDB_ATTR_FLAG_ALLOCATED) {
		talloc_free(discard_const_p(char, a->name));
	}

	i = a - ldb->schema.attributes;
	if (i < ldb->schema.num_attributes - 1) {
		memmove(&ldb->schema.attributes[i], 
			a+1, sizeof(*a) * (ldb->schema.num_attributes-(i+1)));
	}

	ldb->schema.num_attributes--;
}

/*
  setup a attribute handler using a standard syntax
*/
int ldb_schema_attribute_add(struct ldb_context *ldb,
			     const char *attribute,
			     unsigned flags,
			     const char *syntax)
{
	const struct ldb_schema_syntax *s = ldb_standard_syntax_by_name(ldb, syntax);
	return ldb_schema_attribute_add_with_syntax(ldb, attribute, flags, s);
}

/*
  setup the attribute handles for well known attributes
*/
int ldb_setup_wellknown_attributes(struct ldb_context *ldb)
{
	const struct {
		const char *attr;
		const char *syntax;
	} wellknown[] = {
		{ "dn", LDB_SYNTAX_DN },
		{ "distinguishedName", LDB_SYNTAX_DN },
		{ "cn", LDB_SYNTAX_DIRECTORY_STRING },
		{ "dc", LDB_SYNTAX_DIRECTORY_STRING },
		{ "ou", LDB_SYNTAX_DIRECTORY_STRING },
		{ "objectClass", LDB_SYNTAX_OBJECTCLASS }
	};
	int i;
	int ret;

	for (i=0;i<ARRAY_SIZE(wellknown);i++) {
		ret = ldb_schema_attribute_add(ldb, wellknown[i].attr, 0,
					       wellknown[i].syntax);
		if (ret != LDB_SUCCESS) {
			return ret;
		}
	}

	return LDB_SUCCESS;
}


/*
  add a extended dn syntax to the ldb_schema
*/
int ldb_dn_extended_add_syntax(struct ldb_context *ldb, 
			       unsigned flags,
			       const struct ldb_dn_extended_syntax *syntax)
{
	int n;
	struct ldb_dn_extended_syntax *a;

	if (!syntax) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	n = ldb->schema.num_dn_extended_syntax + 1;

	a = talloc_realloc(ldb, ldb->schema.dn_extended_syntax,
			   struct ldb_dn_extended_syntax, n);

	if (!a) {
		return LDB_ERR_OPERATIONS_ERROR;
	}

	a[ldb->schema.num_dn_extended_syntax] = *syntax;
	ldb->schema.dn_extended_syntax = a;

	ldb->schema.num_dn_extended_syntax = n;

	return LDB_SUCCESS;
}

/*
  return the extended dn syntax for a given name
*/
const struct ldb_dn_extended_syntax *ldb_dn_extended_syntax_by_name(struct ldb_context *ldb,
								    const char *name)
{
	int i;
	for (i=0; i < ldb->schema.num_dn_extended_syntax; i++) {
		if (ldb_attr_cmp(ldb->schema.dn_extended_syntax[i].name, name) == 0) {
			return &ldb->schema.dn_extended_syntax[i];
		}
	}
	return NULL;
}

/*
  set an attribute handler override function - used to delegate schema handling
  to external code
 */
void ldb_schema_attribute_set_override_handler(struct ldb_context *ldb,
					       ldb_attribute_handler_override_fn_t override,
					       void *private_data)
{
	ldb->schema.attribute_handler_override_private = private_data;
	ldb->schema.attribute_handler_override = override;
}