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/*
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 2 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, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Name: ldb
*
* Component: ldb pack/unpack
*
* Description: pack/unpack routines for ldb messages as key/value blobs
*
* Author: Andrew Tridgell
*/
#include "includes.h"
#include "ldb_tdb/ldb_tdb.h"
/* change this if the data format ever changes */
#define LTDB_PACKING_FORMAT 0x26011966
/*
pack a ldb message into a linear buffer in a TDB_DATA
caller frees the data buffer after use
*/
int ltdb_pack_data(struct ldb_context *ctx,
const struct ldb_message *message,
struct TDB_DATA *data)
{
int i;
size_t size;
char *p;
/* work out how big it needs to be */
size = 8;
for (i=0;i<message->num_elements;i++) {
size += 1 + strlen(message->elements[i].name);
size += 4 + message->elements[i].value.length + 1;
}
/* allocate it */
data->dptr = malloc(size);
if (!data->dptr) {
errno = ENOMEM;
return -1;
}
data->dsize = size;
p = data->dptr;
SIVAL(p, 0, LTDB_PACKING_FORMAT);
SIVAL(p, 4, message->num_elements);
p += 8;
for (i=0;i<message->num_elements;i++) {
size_t len = strlen(message->elements[i].name);
memcpy(p, message->elements[i].name, len+1);
p += len + 1;
SIVAL(p, 0, message->elements[i].value.length);
memcpy(p+4, message->elements[i].value.data,
message->elements[i].value.length);
p[4+message->elements[i].value.length] = 0;
p += 4 + message->elements[i].value.length + 1;
}
return 0;
}
/*
unpack a ldb message from a linear buffer in TDB_DATA
note that this does not fill in the class and key elements
caller frees. Memory for the elements[] array is malloced,
but the memory for the elements is re-used from the TDB_DATA
data. This means the caller only has to free the elements array
*/
int ltdb_unpack_data(struct ldb_context *ctx,
const struct TDB_DATA *data,
struct ldb_message *message)
{
char *p;
unsigned int remaining;
int i;
message->elements = NULL;
p = data->dptr;
if (data->dsize < 4) {
errno = EIO;
goto failed;
}
if (IVAL(p, 0) != LTDB_PACKING_FORMAT) {
/* this is where we will cope with upgrading the
format if/when the format is ever changed */
errno = EIO;
goto failed;
}
message->num_elements = IVAL(p, 4);
p += 8;
if (message->num_elements == 0) {
message->elements = NULL;
return 0;
}
/* basic sanity check */
remaining = data->dsize - 8;
if (message->num_elements > remaining / 6) {
errno = EIO;
goto failed;
}
message->elements = malloc_array_p(struct ldb_message_element,
message->num_elements);
if (!message->elements) {
errno = ENOMEM;
goto failed;
}
for (i=0;i<message->num_elements;i++) {
size_t len;
if (remaining < 6) {
errno = EIO;
goto failed;
}
len = strnlen(p, remaining-6);
message->elements[i].name = p;
remaining -= len + 1;
p += len + 1;
len = IVAL(p, 0);
if (len > remaining-5) {
errno = EIO;
goto failed;
}
message->elements[i].value.length = len;
message->elements[i].value.data = p+4;
remaining -= len+4+1;
p += len+4+1;
}
return 0;
failed:
if (message->elements) {
free(message->elements);
}
return -1;
}
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