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/*
File: file_fs.c
Copyright (C) 2007 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_fs)
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#include <stdio.h>
#include "types.h"
#include "common.h"
#include "filegen.h"
#include "common.h"
#include "log.h"
/*@ requires valid_register_header_check(file_stat); */
static void register_header_check_fs(file_stat_t *file_stat);
const file_hint_t file_hint_fs= {
.extension="fs",
.description="Zope",
.max_filesize=200*1024*1024,
.recover=1,
.enable_by_default=1,
.register_header_check=®ister_header_check_fs
};
/* See http://www.linkitsolutions.org/uploader/dilu/lib/python2.6/site-packages/ZODB/FileStorage/FileStorage.py for more information */
struct transaction_header
{
uint64_t id;
uint64_t len;
char status;
uint16_t len_username;
uint16_t len_descr;
uint16_t len_ext;
} __attribute__ ((gcc_struct, __packed__));
/*@
@ requires file_recovery->data_check==&data_check_fs;
@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
@ terminates \true;
@ ensures valid_data_check_result(\result, file_recovery);
@ assigns file_recovery->calculated_file_size;
@*/
static data_check_t data_check_fs(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
{
/*@ 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 + 0x11);
@*/
while(file_recovery->calculated_file_size + buffer_size/2 >= file_recovery->file_size &&
file_recovery->calculated_file_size + 0x11 < 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 - 0x11; */
const struct transaction_header *hdr=(const struct transaction_header *)&buffer[i];
const uint64_t len=be64(hdr->len);
if(len < sizeof(struct transaction_header)-8)
return DC_STOP;
if(hdr->status!=' ' && hdr->status!='p' && hdr->status!='c' && hdr->status!='u')
return DC_STOP;
if(len > PHOTOREC_MAX_FILE_SIZE)
return DC_STOP;
#ifdef DEBUG_FS
log_info("0x%08llx len=%llu status=%c\n", (long long unsigned)file_recovery->calculated_file_size, (long long unsigned)len, hdr->status);
#endif
file_recovery->calculated_file_size+=(uint64_t)8+len;
#ifdef DEBUG_FS
log_info("0x%08llx\n", (long long unsigned)file_recovery->calculated_file_size);
#endif
}
return DC_CONTINUE;
}
/*@
@ requires buffer_size >= sizeof(struct transaction_header);
@ requires separation: \separated(&file_hint_fs, 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);
@ assigns *file_recovery_new;
@*/
static int header_check_fs(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 transaction_header *hdr=(const struct transaction_header *)&buffer[4];
const uint64_t len=be64(hdr->len);
if(len < sizeof(struct transaction_header)-8)
return 0;
if(hdr->status!=' ' && hdr->status!='p' && hdr->status!='c' && hdr->status!='u')
return 0;
reset_file_recovery(file_recovery_new);
file_recovery_new->extension=file_hint_fs.extension;
if(file_recovery_new->blocksize < 0x11)
return 1;
file_recovery_new->data_check=&data_check_fs;
file_recovery_new->file_check=&file_check_size;
file_recovery_new->calculated_file_size=4;
return 1;
}
static void register_header_check_fs(file_stat_t *file_stat)
{
static const unsigned char fs_header[4]={ 'F', 'S','2','1' };
register_header_check(0, fs_header,sizeof(fs_header), &header_check_fs, file_stat);
}
#endif
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