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/*
File: file_mft.c
Copyright (C) 2012 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_mft)
#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 "ntfs_struct.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_mft(file_stat_t *file_stat);
const file_hint_t file_hint_mft= {
.extension="mft",
.description="NTFS MFT record",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=0,
.enable_by_default=1,
.register_header_check=®ister_header_check_mft
};
/*@
@ requires valid_file_rename_param(file_recovery);
@ ensures valid_file_rename_result(file_recovery);
@*/
static void file_rename_mft(file_recovery_t *file_recovery)
{
unsigned char buffer[512];
char buffer_cluster[32];
FILE *file;
int buffer_size;
const struct ntfs_mft_record *record=(const struct ntfs_mft_record *)&buffer;
if((file=fopen(file_recovery->filename, "rb"))==NULL)
return;
buffer_size=fread(buffer, 1, sizeof(buffer), file);
fclose(file);
if(buffer_size<54)
return;
#if defined(__FRAMAC__)
Frama_C_make_unknown(buffer, sizeof(buffer));
#endif
/*@ assert \initialized(buffer + (0 .. sizeof(buffer)-1)); */
sprintf(buffer_cluster, "record_%u", (unsigned int)le32(record->mft_record_number));
#if defined(DISABLED_FOR_FRAMAC)
buffer_cluster[sizeof(buffer_cluster)-1]='\0';
#endif
file_rename(file_recovery, buffer_cluster, strlen(buffer_cluster), 0, NULL, 1);
}
/*@
@ requires buffer_size >= sizeof(struct ntfs_mft_record);
@ requires separation: \separated(&file_hint_mft, buffer+(..), file_recovery, file_recovery_new);
@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
@ ensures valid_header_check_result(\result, file_recovery_new);
@ assigns *file_recovery_new;
@*/
static int header_check_mft(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 ntfs_mft_record *mft_rec=(const struct ntfs_mft_record *)buffer;
const unsigned int usa_ofs = le16(mft_rec->usa_ofs);
const unsigned int usa_count = le16(mft_rec->usa_count);
const unsigned int attrs_offset = le16(mft_rec->attrs_offset);
const unsigned int bytes_in_use = le32(mft_rec->bytes_in_use);
const unsigned int bytes_allocated = le32(mft_rec->bytes_allocated);
if(!(memcmp(buffer,"FILE",4)==0 &&
usa_ofs+usa_count <= attrs_offset &&
42 <= attrs_offset &&
attrs_offset%8==0 &&
attrs_offset < bytes_in_use &&
bytes_in_use <= bytes_allocated))
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_mft.extension;
file_recovery_new->calculated_file_size=td_max(file_recovery_new->blocksize, bytes_allocated);
file_recovery_new->data_check=&data_check_size;
file_recovery_new->file_check=&file_check_size;
file_recovery_new->file_rename=&file_rename_mft;
return 1;
}
static void register_header_check_mft(file_stat_t *file_stat)
{
register_header_check(0, "FILE", 4, &header_check_mft, file_stat);
}
#endif
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