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/*
File: file_bac.c
Copyright (C) 2009 Christophe GRENIER <grenier@cgsecurity.org>
This software is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write the Free Software Foundation, Inc., 51
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "filegen.h"
#include "common.h"
#include "log.h"
#include "memmem.h"
static void register_header_check_bac(file_stat_t *file_stat);
static int header_check_bac(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new);
static int data_check_bac(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery);
const file_hint_t file_hint_bac= {
.extension="bac",
.description="Bacula backup",
.min_header_distance=0,
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_bac
};
static const unsigned char bac_header[8]={ 0, 0, 0, 0, 'B', 'B', '0', '2' };
static void register_header_check_bac(file_stat_t *file_stat)
{
register_header_check(8, bac_header, sizeof(bac_header), &header_check_bac, file_stat);
}
static int header_check_bac(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
{
if(memcmp(&buffer[8], bac_header, sizeof(bac_header))==0)
{
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_bac.extension;
file_recovery_new->data_check=data_check_bac;
file_recovery_new->file_check=&file_check_size;
file_recovery_new->calculated_file_size=0;
return 1;
}
return 0;
}
static int data_check_bac(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + 0x18 < file_recovery->file_size + buffer_size/2)
{
const unsigned int i=file_recovery->calculated_file_size - file_recovery->file_size + buffer_size/2;
const unsigned int block_size=(buffer[i+4]<<24)|(buffer[i+5]<<16)|(buffer[i+6]<<8)|buffer[i+7];
#ifdef DEBUG_BACULA
const unsigned int block_nbr=(buffer[i+8]<<24)|(buffer[i+9]<<16)|(buffer[i+10]<<8)|buffer[i+11];
log_trace("file_bac.c: block %u size %u, calculated_file_size %llu\n",
block_nbr, block_size,
(long long unsigned)file_recovery->calculated_file_size);
#endif
if(memcmp(&buffer[i+12], "BB02", 4)!=0 || block_size<0x18)
{
log_error("file_bac.c: invalid block at %llu\n",
(long long unsigned)file_recovery->calculated_file_size);
return 2;
}
file_recovery->calculated_file_size+=(uint64_t)block_size;
}
#ifdef DEBUG_BACULA
log_trace("file_bac.c: new calculated_file_size %llu\n",
(long long unsigned)file_recovery->calculated_file_size);
#endif
return 1;
}
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