121 lines
4.4 KiB
C
121 lines
4.4 KiB
C
/*
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File: file_bkf.c
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Copyright (C) 2006-2007 Christophe GRENIER <grenier@cgsecurity.org>
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This software is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_bkf)
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include <stdio.h>
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#include "types.h"
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#include "filegen.h"
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#include "common.h"
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#include "log.h"
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/*@
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@ requires valid_register_header_check(file_stat);
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@*/
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static void register_header_check_bkf(file_stat_t *file_stat);
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const file_hint_t file_hint_bkf= {
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.extension="bkf",
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.description="MS Backup file",
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.max_filesize=PHOTOREC_MAX_FILE_SIZE,
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.recover=1,
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.enable_by_default=1,
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.register_header_check=®ister_header_check_bkf
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};
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struct mtf_db_hdr
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{
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uint32_t type; /* DBLK type */
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uint32_t attr; /* block attributes */
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uint16_t off; /* offset to first event */
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uint8_t osId; /* OS ID */
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uint8_t osVer; /* OS version */
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uint64_t size; /* displayable size */
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uint64_t fla; /* format logical address */
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uint16_t mbc; /* reserved for MBC */
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uint8_t rsv1[6]; /* reserved for future use */
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uint32_t cbId; /* control block ID */
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uint8_t rsv2[4]; /* reserved for future use */
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uint32_t osData; /* OS-specific data */
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uint8_t strType; /* string type */
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uint8_t rsv3; /* reserved for future use */
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uint16_t check; /* header checksum */
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} __attribute__ ((gcc_struct, __packed__));
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/*@
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@ requires file_recovery->file_check == &file_check_bkf;
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@ requires valid_file_check_param(file_recovery);
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@ ensures valid_file_check_result(file_recovery);
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@ assigns *file_recovery->handle, errno, file_recovery->file_size;
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@ assigns Frama_C_entropy_source;
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@*/
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static void file_check_bkf(file_recovery_t *file_recovery)
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{
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const unsigned char bkf_footer[4]= { 'S', 'F', 'M', 'B'};
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file_search_footer(file_recovery, bkf_footer, sizeof(bkf_footer), 0x400-4);
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}
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/*@
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@ requires buffer_size >= sizeof(struct mtf_db_hdr);
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@ requires separation: \separated(&file_hint_bkf, buffer+(..), file_recovery, file_recovery_new);
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@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
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@ ensures valid_header_check_result(\result, file_recovery_new);
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@ ensures (\result == 1) ==> file_recovery_new->file_size == 0;
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@ ensures (\result == 1) ==> (file_recovery_new->time == 0);
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@ ensures (\result == 1) ==> (file_recovery_new->calculated_file_size == 0);
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@ ensures (\result == 1) ==> (file_recovery_new->min_filesize == 52);
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@ ensures (\result == 1) ==> (file_recovery_new->extension == file_hint_bkf.extension);
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@ ensures (\result == 1) ==> (file_recovery_new->file_check == &file_check_bkf);
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@ assigns *file_recovery_new;
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@*/
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static int header_check_bkf(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)
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{
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const struct mtf_db_hdr *hdr=(const struct mtf_db_hdr *)buffer;
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/* Microsoft Tape Format
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* The DBLK Type field is set to ‘TAPE’.
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* The Format Logical Address field is set to zero.
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* The Control Block ID field is set to zero.
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*/
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if(le64(hdr->fla)!=0 || le32(hdr->cbId)!=0 || hdr->strType>2 ||
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le16(hdr->off)<sizeof(struct mtf_db_hdr))
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return 0;
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#ifdef DEBUG_BKF
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log_info("off=%u\n", le16(hdr->off));
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#endif
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reset_file_recovery(file_recovery_new);
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file_recovery_new->min_filesize=52;
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file_recovery_new->extension=file_hint_bkf.extension;
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file_recovery_new->file_check=&file_check_bkf;
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return 1;
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}
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static void register_header_check_bkf(file_stat_t *file_stat)
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{
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static const unsigned char bkf_header[4]= { 'T','A','P','E'};
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register_header_check(0, bkf_header,sizeof(bkf_header), &header_check_bkf, file_stat);
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}
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#endif
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