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 2 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, write to the Free Software
22 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
28 * Component: ldb pack/unpack
30 * Description: pack/unpack routines for ldb messages as key/value blobs
32 * Author: Andrew Tridgell
36 #include "ldb/include/includes.h"
38 #include "ldb/ldb_tdb/ldb_tdb.h"
40 /* change this if the data format ever changes */
41 #define LTDB_PACKING_FORMAT 0x26011967
43 /* old packing formats */
44 #define LTDB_PACKING_FORMAT_NODN 0x26011966
46 /* use a portable integer format */
47 static void put_uint32(uint8_t *p, int ofs, unsigned int val)
51 p[1] = (val>>8) & 0xFF;
52 p[2] = (val>>16) & 0xFF;
53 p[3] = (val>>24) & 0xFF;
56 static unsigned int pull_uint32(uint8_t *p, int ofs)
59 return p[0] | (p[1]<<8) | (p[2]<<16) | (p[3]<<24);
62 static int attribute_storable_values(const struct ldb_message_element *el)
64 if (el->num_values == 0) return 0;
66 if (ldb_attr_cmp(el->name, "dn") == 0) return 0;
68 if (ldb_attr_cmp(el->name, "distinguishedName") == 0) return 0;
70 return el->num_values;
74 pack a ldb message into a linear buffer in a TDB_DATA
76 note that this routine avoids saving elements with zero values,
77 as these are equivalent to having no element
79 caller frees the data buffer after use
81 int ltdb_pack_data(struct ldb_module *module,
82 const struct ldb_message *message,
83 struct TDB_DATA *data)
85 struct ldb_context *ldb = module->ldb;
86 unsigned int i, j, real_elements=0;
92 dn = ldb_dn_get_linearized(message->dn);
98 /* work out how big it needs to be */
101 size += 1 + strlen(dn);
103 for (i=0;i<message->num_elements;i++) {
104 if (attribute_storable_values(&message->elements[i]) == 0) {
110 size += 1 + strlen(message->elements[i].name) + 4;
111 for (j=0;j<message->elements[i].num_values;j++) {
112 size += 4 + message->elements[i].values[j].length + 1;
117 data->dptr = talloc_array(ldb, uint8_t, size);
125 put_uint32(p, 0, LTDB_PACKING_FORMAT);
126 put_uint32(p, 4, real_elements);
129 /* the dn needs to be packed so we can be case preserving
130 while hashing on a case folded dn */
132 memcpy(p, dn, len+1);
135 for (i=0;i<message->num_elements;i++) {
136 if (attribute_storable_values(&message->elements[i]) == 0) {
139 len = strlen(message->elements[i].name);
140 memcpy(p, message->elements[i].name, len+1);
142 put_uint32(p, 0, message->elements[i].num_values);
144 for (j=0;j<message->elements[i].num_values;j++) {
145 put_uint32(p, 0, message->elements[i].values[j].length);
146 memcpy(p+4, message->elements[i].values[j].data,
147 message->elements[i].values[j].length);
148 p[4+message->elements[i].values[j].length] = 0;
149 p += 4 + message->elements[i].values[j].length + 1;
157 unpack a ldb message from a linear buffer in TDB_DATA
159 Free with ltdb_unpack_data_free()
161 int ltdb_unpack_data(struct ldb_module *module,
162 const struct TDB_DATA *data,
163 struct ldb_message *message)
165 struct ldb_context *ldb = module->ldb;
167 unsigned int remaining;
172 message->elements = NULL;
175 if (data->dsize < 8) {
180 format = pull_uint32(p, 0);
181 message->num_elements = pull_uint32(p, 4);
184 remaining = data->dsize - 8;
187 case LTDB_PACKING_FORMAT_NODN:
191 case LTDB_PACKING_FORMAT:
192 len = strnlen((char *)p, remaining);
193 if (len == remaining) {
197 message->dn = ldb_dn_new(message, ldb, (char *)p);
198 if (message->dn == NULL) {
202 remaining -= len + 1;
211 if (message->num_elements == 0) {
212 message->elements = NULL;
216 if (message->num_elements > remaining / 6) {
221 message->elements = talloc_array(message, struct ldb_message_element, message->num_elements);
222 if (!message->elements) {
227 memset(message->elements, 0,
228 message->num_elements * sizeof(struct ldb_message_element));
230 for (i=0;i<message->num_elements;i++) {
231 if (remaining < 10) {
235 len = strnlen((char *)p, remaining-6);
236 if (len == remaining-6) {
240 message->elements[i].flags = 0;
241 message->elements[i].name = talloc_strndup(message->elements, (char *)p, len);
242 if (message->elements[i].name == NULL) {
246 remaining -= len + 1;
248 message->elements[i].num_values = pull_uint32(p, 0);
249 message->elements[i].values = NULL;
250 if (message->elements[i].num_values != 0) {
251 message->elements[i].values = talloc_array(message->elements,
253 message->elements[i].num_values);
254 if (!message->elements[i].values) {
261 for (j=0;j<message->elements[i].num_values;j++) {
262 len = pull_uint32(p, 0);
263 if (len > remaining-5) {
268 message->elements[i].values[j].length = len;
269 message->elements[i].values[j].data = talloc_size(message->elements[i].values, len+1);
270 if (message->elements[i].values[j].data == NULL) {
274 memcpy(message->elements[i].values[j].data, p+4, len);
275 message->elements[i].values[j].data[len] = 0;
277 remaining -= len+4+1;
282 if (remaining != 0) {
283 ldb_debug(ldb, LDB_DEBUG_ERROR,
284 "Error: %d bytes unread in ltdb_unpack_data\n", remaining);
290 talloc_free(message->elements);