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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.
*/
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_bac)
#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"
/*@
@ requires valid_register_header_check(file_stat);
@*/
static void register_header_check_bac(file_stat_t *file_stat);
const file_hint_t file_hint_bac= {
.extension="bac",
.description="Bacula backup",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_bac
};
struct block_header
{
uint32_t CheckSum; /* Block check sum */
uint32_t BlockSize; /* Block byte size including the header */
uint32_t BlockNumber; /* Block number */
char ID[4]; /* Identification and block level */
uint32_t VolSessionId; /* Session Id for Job */
uint32_t VolSessionTime; /* Session Time for Job */
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires buffer_size >= 2*0x18;
@ requires file_recovery->data_check==&data_check_bac;
@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
@ ensures valid_data_check_result(\result, file_recovery);
@ assigns file_recovery->calculated_file_size;
@*/
static data_check_t data_check_bac(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
/*@ assert buffer_size >= 2*0x18; */
/*@ assert file_recovery->calculated_file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@ assert file_recovery->file_size <= PHOTOREC_MAX_FILE_SIZE; */
/*@
@ loop assigns file_recovery->calculated_file_size;
@ loop variant file_recovery->file_size + buffer_size/2 - (file_recovery->calculated_file_size + 0x18);
@*/
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 + buffer_size/2 - file_recovery->file_size;
/*@ assert 0 <= i < buffer_size - 0x18 ; */
const struct block_header *hdr=(const struct block_header *)&buffer[i];
const unsigned int block_size=be32(hdr->BlockSize);
#ifdef DEBUG_BACULA
const unsigned int block_nbr=be32(hdr->BlockNumber);
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(hdr->ID, "BB02", 4)!=0 || block_size<0x18)
{
#ifndef DISABLED_FOR_FRAMAC
log_error("file_bac.c: invalid block at %llu\n",
(long long unsigned)file_recovery->calculated_file_size);
#endif
return DC_STOP;
}
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 DC_CONTINUE;
}
/*@
@ requires buffer_size >= sizeof(struct block_header);
@ requires separation: \separated(&file_hint_bac, buffer, file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ terminates \true;
@ ensures valid_header_check_result(\result, file_recovery_new);
@ ensures (\result == 1) ==> (file_recovery_new->time == 0);
@ ensures (\result == 1) ==> (file_recovery_new->file_size == 0);
@ ensures (\result == 1) ==> (file_recovery_new->calculated_file_size == 0);
@ ensures (\result == 1) ==> (file_recovery_new->data_check == \null || file_recovery_new->data_check == &data_check_bac);
@ ensures (\result == 1) ==> (file_recovery_new->file_check == \null || file_recovery_new->file_check == &file_check_size);
@ ensures (\result == 1) ==> (file_recovery_new->extension == file_hint_bac.extension);
@ assigns *file_recovery_new;
@*/
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)
{
const struct block_header *hdr=(const struct block_header *)buffer;
if(be32(hdr->BlockSize) < 0x18)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_bac.extension;
file_recovery_new->min_filesize=be32(hdr->BlockSize);
file_recovery_new->calculated_file_size=0;
if(file_recovery_new->blocksize >= 0x18)
{
file_recovery_new->data_check=&data_check_bac;
file_recovery_new->file_check=&file_check_size;
}
return 1;
}
static void register_header_check_bac(file_stat_t *file_stat)
{
static const unsigned char bac_header[8]={ 0, 0, 0, 0, 'B', 'B', '0', '2' };
register_header_check(8, bac_header, sizeof(bac_header), &header_check_bac, file_stat);
}
#endif
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