4 Copyright (C) Andrew Tridgell 2004
6 ** NOTE! The following LGPL license applies to the ldb
7 ** library. This does NOT imply that all of Samba is released
10 This library is free software; you can redistribute it and/or
11 modify it under the terms of the GNU Lesser General Public
12 License as published by the Free Software Foundation; either
13 version 3 of the License, or (at your option) any later version.
15 This library is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 Lesser General Public License for more details.
20 You should have received a copy of the GNU Lesser General Public
21 License along with this library; if not, see <http://www.gnu.org/licenses/>.
27 * Component: ldb pack/unpack
29 * Description: pack/unpack routines for ldb messages as key/value blobs
31 * Author: Andrew Tridgell
34 #include "ldb_includes.h"
37 /* change this if the data format ever changes */
38 #define LTDB_PACKING_FORMAT 0x26011967
40 /* old packing formats */
41 #define LTDB_PACKING_FORMAT_NODN 0x26011966
43 /* use a portable integer format */
44 static void put_uint32(uint8_t *p, int ofs, unsigned int val)
48 p[1] = (val>>8) & 0xFF;
49 p[2] = (val>>16) & 0xFF;
50 p[3] = (val>>24) & 0xFF;
53 static unsigned int pull_uint32(uint8_t *p, int ofs)
56 return p[0] | (p[1]<<8) | (p[2]<<16) | (p[3]<<24);
59 static int attribute_storable_values(const struct ldb_message_element *el)
61 if (el->num_values == 0) return 0;
63 if (ldb_attr_cmp(el->name, "dn") == 0) return 0;
65 if (ldb_attr_cmp(el->name, "distinguishedName") == 0) return 0;
67 return el->num_values;
71 pack a ldb message into a linear buffer in a TDB_DATA
73 note that this routine avoids saving elements with zero values,
74 as these are equivalent to having no element
76 caller frees the data buffer after use
78 int ltdb_pack_data(struct ldb_module *module,
79 const struct ldb_message *message,
80 struct TDB_DATA *data)
82 struct ldb_context *ldb = module->ldb;
83 unsigned int i, j, real_elements=0;
89 dn = ldb_dn_get_linearized(message->dn);
95 /* work out how big it needs to be */
98 size += 1 + strlen(dn);
100 for (i=0;i<message->num_elements;i++) {
101 if (attribute_storable_values(&message->elements[i]) == 0) {
107 size += 1 + strlen(message->elements[i].name) + 4;
108 for (j=0;j<message->elements[i].num_values;j++) {
109 size += 4 + message->elements[i].values[j].length + 1;
114 data->dptr = talloc_array(ldb, uint8_t, size);
122 put_uint32(p, 0, LTDB_PACKING_FORMAT);
123 put_uint32(p, 4, real_elements);
126 /* the dn needs to be packed so we can be case preserving
127 while hashing on a case folded dn */
129 memcpy(p, dn, len+1);
132 for (i=0;i<message->num_elements;i++) {
133 if (attribute_storable_values(&message->elements[i]) == 0) {
136 len = strlen(message->elements[i].name);
137 memcpy(p, message->elements[i].name, len+1);
139 put_uint32(p, 0, message->elements[i].num_values);
141 for (j=0;j<message->elements[i].num_values;j++) {
142 put_uint32(p, 0, message->elements[i].values[j].length);
143 memcpy(p+4, message->elements[i].values[j].data,
144 message->elements[i].values[j].length);
145 p[4+message->elements[i].values[j].length] = 0;
146 p += 4 + message->elements[i].values[j].length + 1;
154 unpack a ldb message from a linear buffer in TDB_DATA
156 Free with ltdb_unpack_data_free()
158 int ltdb_unpack_data(struct ldb_module *module,
159 const struct TDB_DATA *data,
160 struct ldb_message *message)
162 struct ldb_context *ldb = module->ldb;
164 unsigned int remaining;
169 message->elements = NULL;
172 if (data->dsize < 8) {
177 format = pull_uint32(p, 0);
178 message->num_elements = pull_uint32(p, 4);
181 remaining = data->dsize - 8;
184 case LTDB_PACKING_FORMAT_NODN:
188 case LTDB_PACKING_FORMAT:
189 len = strnlen((char *)p, remaining);
190 if (len == remaining) {
194 message->dn = ldb_dn_new(message, ldb, (char *)p);
195 if (message->dn == NULL) {
199 remaining -= len + 1;
208 if (message->num_elements == 0) {
209 message->elements = NULL;
213 if (message->num_elements > remaining / 6) {
218 message->elements = talloc_array(message, struct ldb_message_element, message->num_elements);
219 if (!message->elements) {
224 memset(message->elements, 0,
225 message->num_elements * sizeof(struct ldb_message_element));
227 for (i=0;i<message->num_elements;i++) {
228 if (remaining < 10) {
232 len = strnlen((char *)p, remaining-6);
233 if (len == remaining-6) {
237 message->elements[i].flags = 0;
238 message->elements[i].name = talloc_strndup(message->elements, (char *)p, len);
239 if (message->elements[i].name == NULL) {
243 remaining -= len + 1;
245 message->elements[i].num_values = pull_uint32(p, 0);
246 message->elements[i].values = NULL;
247 if (message->elements[i].num_values != 0) {
248 message->elements[i].values = talloc_array(message->elements,
250 message->elements[i].num_values);
251 if (!message->elements[i].values) {
258 for (j=0;j<message->elements[i].num_values;j++) {
259 len = pull_uint32(p, 0);
260 if (len > remaining-5) {
265 message->elements[i].values[j].length = len;
266 message->elements[i].values[j].data = talloc_size(message->elements[i].values, len+1);
267 if (message->elements[i].values[j].data == NULL) {
271 memcpy(message->elements[i].values[j].data, p+4, len);
272 message->elements[i].values[j].data[len] = 0;
274 remaining -= len+4+1;
279 if (remaining != 0) {
280 ldb_debug(ldb, LDB_DEBUG_ERROR,
281 "Error: %d bytes unread in ltdb_unpack_data\n", remaining);
287 talloc_free(message->elements);