116 lines
4.5 KiB
C
116 lines
4.5 KiB
C
/*
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File: file_rar.c
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Copyright (C) 1998-2005,2007 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_rar)
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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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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_rar(file_stat_t *file_stat);
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const file_hint_t file_hint_rar= {
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.extension="rar",
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.description="Rar archive",
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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_rar
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};
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#define MHD_PASSWORD 0x0080U
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/*@
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@ requires file_recovery->file_check == &file_check_rar15fmt;
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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_rar15fmt(file_recovery_t *file_recovery)
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{
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static const unsigned char rar15fmt_footer[7]={0xc4, 0x3d, 0x7b, 0x00, 0x40, 0x07, 0x00 };
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file_search_footer(file_recovery, rar15fmt_footer, sizeof(rar15fmt_footer), 0);
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}
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/*@
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@ requires buffer_size >= 0xb;
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@ requires separation: \separated(&file_hint_rar, 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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@ assigns *file_recovery_new;
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@*/
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static int header_check_rar15fmt(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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reset_file_recovery(file_recovery_new);
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file_recovery_new->min_filesize=70;
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if((buffer[0xa] & MHD_PASSWORD)==0)
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file_recovery_new->file_check=&file_check_rar15fmt;
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file_recovery_new->extension=file_hint_rar.extension;
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return 1;
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}
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/*@
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@ requires file_recovery->file_check == &file_check_rar50fmt;
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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_rar50fmt(file_recovery_t *file_recovery)
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{
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static const unsigned char rar50fmt_footer[8]={0x1d, 0x77, 0x56, 0x51, 0x03, 0x05, 0x04, 0x00 };
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file_search_footer(file_recovery, rar50fmt_footer, sizeof(rar50fmt_footer), 0);
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}
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/*@
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@ requires buffer_size >= 0xb;
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@ requires separation: \separated(&file_hint_rar, 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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@ assigns *file_recovery_new;
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@*/
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static int header_check_rar50fmt(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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reset_file_recovery(file_recovery_new);
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file_recovery_new->min_filesize=60;
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if((buffer[0xa] & MHD_PASSWORD)==0)
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file_recovery_new->file_check=&file_check_rar50fmt;
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file_recovery_new->extension=file_hint_rar.extension;
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return 1;
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}
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static void register_header_check_rar(file_stat_t *file_stat)
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{
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static const unsigned char rar15fmt_header[7]={0x52, 0x61, 0x72, 0x21, 0x1a, 0x07, 0x00 };
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static const unsigned char rar50fmt_header[8]={0x52, 0x61, 0x72, 0x21, 0x1a, 0x07, 0x01, 0x00 };
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register_header_check(0, rar15fmt_header,sizeof(rar15fmt_header), &header_check_rar15fmt, file_stat);
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register_header_check(0, rar50fmt_header,sizeof(rar50fmt_header), &header_check_rar50fmt, file_stat);
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}
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#endif
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