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/*
File: file_mig.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_mig)
#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"
#ifdef DEBUG_MIG
#include "log.h"
#endif
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_mig(file_stat_t *file_stat);
const file_hint_t file_hint_mig= {
.extension="mig",
.description="Windows Migration Backup",
.max_filesize=PHOTOREC_MAX_FILE_SIZE,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_mig
};
struct MIG_HDR
{
uint32_t magic;
uint32_t fn_size;
uint32_t s_size;
uint32_t unk1;
uint32_t unk2;
uint32_t unk3;
#ifndef DISABLED_FOR_FRAMAC
unsigned char fn[0];
#endif
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires file_recovery->file_check == &file_check_mig;
@ requires \separated(file_recovery, file_recovery->handle, file_recovery->extension, &errno, &Frama_C_entropy_source);
@ requires valid_file_check_param(file_recovery);
@ ensures valid_file_check_result(file_recovery);
@ assigns *file_recovery->handle, errno, file_recovery->file_size;
@ assigns Frama_C_entropy_source;
@*/
static void file_check_mig(file_recovery_t *file_recovery)
{
uint64_t offset=0x34;
file_recovery->file_size=0;
/*@
@ loop assigns *file_recovery->handle, errno, file_recovery->file_size;
@ loop assigns Frama_C_entropy_source;
@ loop assigns offset;
@*/
while(1)
{
char buffer[sizeof(struct MIG_HDR)];
const struct MIG_HDR *h=(const struct MIG_HDR *)&buffer;
size_t res;
if(my_fseek(file_recovery->handle, offset, SEEK_SET) < 0)
{
#ifdef DEBUG_MIG
log_info("0x%lx fseek failed\n", (long unsigned)offset);
#endif
return ;
}
res=fread(&buffer, 1, sizeof(buffer), file_recovery->handle);
if(res < 8)
{
#ifdef DEBUG_MIG
log_info("0x%lx not enough data\n", (long unsigned)offset);
#endif
return ;
}
/* STRM=stream */
if(res < sizeof(buffer) || le32(h->magic)!=0x5354524d || offset >= PHOTOREC_MAX_FILE_SIZE)
{
#ifdef DEBUG_MIG
log_info("0x%lx no magic %x\n", (long unsigned)offset, le32(h->magic));
#endif
file_recovery->file_size=offset+8;
return ;
}
#ifdef DEBUG_MIG
log_info("0x%lx magic s_size=0x%u\n", (long unsigned)offset, le32(h->s_size));
#endif
offset+=sizeof(buffer)+le32(h->s_size);
}
}
/*@
@ requires buffer_size > 0x38;
@ requires separation: \separated(&file_hint_mig, 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_mig(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[0x34], "MRTS", 4)!=0)
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_mig.extension;
file_recovery_new->file_check=&file_check_mig;
return 1;
}
static void register_header_check_mig(file_stat_t *file_stat)
{
static const unsigned char mig_header[8]= {
'1' , 'g' , 'i' , 'M' , 0x02, 0x00, 0x00, 0x00
};
register_header_check(0, mig_header, sizeof(mig_header), &header_check_mig, file_stat);
}
#endif
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