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-rw-r--r--lib/ldb/common/ldb_pack.c290
1 files changed, 290 insertions, 0 deletions
diff --git a/lib/ldb/common/ldb_pack.c b/lib/ldb/common/ldb_pack.c
new file mode 100644
index 0000000000..03e0ec1ddf
--- /dev/null
+++ b/lib/ldb/common/ldb_pack.c
@@ -0,0 +1,290 @@
+/*
+ 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: ldb pack/unpack
+ *
+ * Description: pack/unpack routines for ldb messages as key/value blobs
+ *
+ * Author: Andrew Tridgell
+ */
+
+#include "ldb_tdb.h"
+
+/* change this if the data format ever changes */
+#define LTDB_PACKING_FORMAT 0x26011967
+
+/* old packing formats */
+#define LTDB_PACKING_FORMAT_NODN 0x26011966
+
+/* use a portable integer format */
+static void put_uint32(uint8_t *p, int ofs, unsigned int val)
+{
+ p += ofs;
+ p[0] = val&0xFF;
+ p[1] = (val>>8) & 0xFF;
+ p[2] = (val>>16) & 0xFF;
+ p[3] = (val>>24) & 0xFF;
+}
+
+static unsigned int pull_uint32(uint8_t *p, int ofs)
+{
+ p += ofs;
+ return p[0] | (p[1]<<8) | (p[2]<<16) | (p[3]<<24);
+}
+
+static int attribute_storable_values(const struct ldb_message_element *el)
+{
+ if (el->num_values == 0) return 0;
+
+ if (ldb_attr_cmp(el->name, "distinguishedName") == 0) return 0;
+
+ return el->num_values;
+}
+
+/*
+ pack a ldb message into a linear buffer in a TDB_DATA
+
+ note that this routine avoids saving elements with zero values,
+ as these are equivalent to having no element
+
+ caller frees the data buffer after use
+*/
+int ltdb_pack_data(struct ldb_module *module,
+ const struct ldb_message *message,
+ TDB_DATA *data)
+{
+ struct ldb_context *ldb;
+ unsigned int i, j, real_elements=0;
+ size_t size;
+ const char *dn;
+ uint8_t *p;
+ size_t len;
+
+ ldb = ldb_module_get_ctx(module);
+
+ dn = ldb_dn_get_linearized(message->dn);
+ if (dn == NULL) {
+ errno = ENOMEM;
+ return -1;
+ }
+
+ /* work out how big it needs to be */
+ size = 8;
+
+ size += 1 + strlen(dn);
+
+ for (i=0;i<message->num_elements;i++) {
+ if (attribute_storable_values(&message->elements[i]) == 0) {
+ continue;
+ }
+
+ real_elements++;
+
+ size += 1 + strlen(message->elements[i].name) + 4;
+ for (j=0;j<message->elements[i].num_values;j++) {
+ size += 4 + message->elements[i].values[j].length + 1;
+ }
+ }
+
+ /* allocate it */
+ data->dptr = talloc_array(ldb, uint8_t, size);
+ if (!data->dptr) {
+ errno = ENOMEM;
+ return -1;
+ }
+ data->dsize = size;
+
+ p = data->dptr;
+ put_uint32(p, 0, LTDB_PACKING_FORMAT);
+ put_uint32(p, 4, real_elements);
+ p += 8;
+
+ /* the dn needs to be packed so we can be case preserving
+ while hashing on a case folded dn */
+ len = strlen(dn);
+ memcpy(p, dn, len+1);
+ p += len + 1;
+
+ for (i=0;i<message->num_elements;i++) {
+ if (attribute_storable_values(&message->elements[i]) == 0) {
+ continue;
+ }
+ len = strlen(message->elements[i].name);
+ memcpy(p, message->elements[i].name, len+1);
+ p += len + 1;
+ put_uint32(p, 0, message->elements[i].num_values);
+ p += 4;
+ for (j=0;j<message->elements[i].num_values;j++) {
+ put_uint32(p, 0, message->elements[i].values[j].length);
+ memcpy(p+4, message->elements[i].values[j].data,
+ message->elements[i].values[j].length);
+ p[4+message->elements[i].values[j].length] = 0;
+ p += 4 + message->elements[i].values[j].length + 1;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ unpack a ldb message from a linear buffer in TDB_DATA
+
+ Free with ltdb_unpack_data_free()
+*/
+int ltdb_unpack_data(struct ldb_context *ldb,
+ const TDB_DATA *data,
+ struct ldb_message *message)
+{
+ uint8_t *p;
+ unsigned int remaining;
+ unsigned int i, j;
+ unsigned format;
+ size_t len;
+
+ message->elements = NULL;
+
+ p = data->dptr;
+ if (data->dsize < 8) {
+ errno = EIO;
+ goto failed;
+ }
+
+ format = pull_uint32(p, 0);
+ message->num_elements = pull_uint32(p, 4);
+ p += 8;
+
+ remaining = data->dsize - 8;
+
+ switch (format) {
+ case LTDB_PACKING_FORMAT_NODN:
+ message->dn = NULL;
+ break;
+
+ case LTDB_PACKING_FORMAT:
+ len = strnlen((char *)p, remaining);
+ if (len == remaining) {
+ errno = EIO;
+ goto failed;
+ }
+ message->dn = ldb_dn_new(message, ldb, (char *)p);
+ if (message->dn == NULL) {
+ errno = ENOMEM;
+ goto failed;
+ }
+ remaining -= len + 1;
+ p += len + 1;
+ break;
+
+ default:
+ errno = EIO;
+ goto failed;
+ }
+
+ if (message->num_elements == 0) {
+ return 0;
+ }
+
+ if (message->num_elements > remaining / 6) {
+ errno = EIO;
+ goto failed;
+ }
+
+ message->elements = talloc_array(message, struct ldb_message_element, message->num_elements);
+ if (!message->elements) {
+ errno = ENOMEM;
+ goto failed;
+ }
+
+ memset(message->elements, 0,
+ message->num_elements * sizeof(struct ldb_message_element));
+
+ for (i=0;i<message->num_elements;i++) {
+ if (remaining < 10) {
+ errno = EIO;
+ goto failed;
+ }
+ len = strnlen((char *)p, remaining-6);
+ if (len == remaining-6) {
+ errno = EIO;
+ goto failed;
+ }
+ if (len == 0) {
+ errno = EIO;
+ goto failed;
+ }
+ message->elements[i].flags = 0;
+ message->elements[i].name = talloc_strndup(message->elements, (char *)p, len);
+ if (message->elements[i].name == NULL) {
+ errno = ENOMEM;
+ goto failed;
+ }
+ remaining -= len + 1;
+ p += len + 1;
+ message->elements[i].num_values = pull_uint32(p, 0);
+ message->elements[i].values = NULL;
+ if (message->elements[i].num_values != 0) {
+ message->elements[i].values = talloc_array(message->elements,
+ struct ldb_val,
+ message->elements[i].num_values);
+ if (!message->elements[i].values) {
+ errno = ENOMEM;
+ goto failed;
+ }
+ }
+ p += 4;
+ remaining -= 4;
+ for (j=0;j<message->elements[i].num_values;j++) {
+ len = pull_uint32(p, 0);
+ if (len > remaining-5) {
+ errno = EIO;
+ goto failed;
+ }
+
+ message->elements[i].values[j].length = len;
+ message->elements[i].values[j].data = talloc_size(message->elements[i].values, len+1);
+ if (message->elements[i].values[j].data == NULL) {
+ errno = ENOMEM;
+ goto failed;
+ }
+ memcpy(message->elements[i].values[j].data, p+4, len);
+ message->elements[i].values[j].data[len] = 0;
+
+ remaining -= len+4+1;
+ p += len+4+1;
+ }
+ }
+
+ if (remaining != 0) {
+ ldb_debug(ldb, LDB_DEBUG_ERROR,
+ "Error: %d bytes unread in ltdb_unpack_data", remaining);
+ }
+
+ return 0;
+
+failed:
+ talloc_free(message->elements);
+ return -1;
+}
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