181 lines
6.1 KiB
C
181 lines
6.1 KiB
C
/*
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File: file_arj.c
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Copyright (C) 2008 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_arj)
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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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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_arj(file_stat_t *file_stat);
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const file_hint_t file_hint_arj= {
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.extension="arj",
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.description="ARJ archive",
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.max_filesize=PHOTOREC_MAX_SIZE_32,
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.recover=1,
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.enable_by_default=1,
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.register_header_check=®ister_header_check_arj
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};
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/*
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* 60 ea 24 00 22 0b 01 02 10 00 02 XX XX XX 50 48
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* ID HS FH V V OS FL SV FT R DATE/TIME
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*
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* Extract from "ARJ TECHNICAL INFORMATION April 1993"
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http://datacompression.info/ArchiveFormats/arj.txt
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Structure of main header (low order byte first):
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Bytes Description
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-------------------------------------------------------------------
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2 header id (main and local file) = 0x60 0xEA
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2 basic header size (from 'first_hdr_size' thru 'comment' below)
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= first_hdr_size + strlen(filename) + 1 + strlen(comment) + 1
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= 0 if end of archive
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maximum header size is 2600
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1 first_hdr_size (size up to and including 'extra data')
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1 archiver version number
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1 minimum archiver version to extract
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1 host OS (0 = MSDOS, 1 = PRIMOS, 2 = UNIX, 3 = AMIGA, 4 = MAC-OS)
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(5 = OS/2, 6 = APPLE GS, 7 = ATARI ST, 8 = NEXT)
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(9 = VAX VMS)
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1 arj flags
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(0x01 = NOT USED)
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(0x02 = OLD_SECURED_FLAG)
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(0x04 = VOLUME_FLAG) indicates presence of succeeding
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volume
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(0x08 = NOT USED)
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(0x10 = PATHSYM_FLAG) indicates archive name translated
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("\" changed to "/")
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(0x20 = BACKUP_FLAG) indicates backup type archive
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(0x40 = SECURED_FLAG)
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1 security version (2 = current)
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1 file type (must equal 2)
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1 reserved
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4 date time when original archive was created
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4 date time when archive was last modified
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4 archive size (currently used only for secured archives)
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4 security envelope file position
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2 filespec position in filename
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2 length in bytes of security envelope data
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2 (currently not used)
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? (currently none)
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? filename of archive when created (null-terminated string)
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? archive comment (null-terminated string)
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4 basic header CRC
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2 1st extended header size (0 if none)
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? 1st extended header (currently not used)
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4 1st extended header's CRC (not present when 0 extended header size)
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*/
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struct arj_main_header {
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uint16_t header_id;
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uint16_t basic_header_size;
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uint8_t first_header_size;
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uint8_t archiver_ver;
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uint8_t archiver_ver_min;
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uint8_t host_os;
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uint8_t flags;
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uint8_t security_ver;
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uint8_t file_type;
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uint8_t reserved;
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uint32_t ctime;
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uint32_t mtime;
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uint32_t size;
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uint32_t security_env_pos;
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uint16_t filespec_pos;
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uint16_t security_env_size;
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uint16_t unused;
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char filename;
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} __attribute__ ((gcc_struct, __packed__));
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/*@
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@ requires file_recovery->file_check == &file_check_arj;
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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_arj(file_recovery_t *file_recovery)
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{
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static const unsigned char arj_footer[4]={0x60, 0xEA, 0x00, 0x00 };
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file_search_footer(file_recovery, arj_footer, sizeof(arj_footer), 0);
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}
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/*@
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@ requires buffer_size >= sizeof(struct arj_main_header);
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@ requires separation: \separated(&file_hint_arj, 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_arj(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 arj_main_header *arj=(const struct arj_main_header*)buffer;
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if(le16(arj->basic_header_size) > 0 &&
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le16(arj->basic_header_size) <= 2600 &&
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arj->archiver_ver_min <= arj->archiver_ver &&
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arj->archiver_ver <=12 &&
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(arj->flags&0x01)==0 &&
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arj->file_type==2)
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{
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if((arj->flags&0x040)!=0)
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{
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if(le32(arj->size) < sizeof(struct arj_main_header))
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return 0;
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reset_file_recovery(file_recovery_new);
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file_recovery_new->calculated_file_size=le32(arj->size);
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file_recovery_new->data_check=&data_check_size;
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file_recovery_new->file_check=&file_check_size;
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}
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else
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{
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// if(le32(arj->size)!=0)
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// return 0;
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reset_file_recovery(file_recovery_new);
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file_recovery_new->file_check=&file_check_arj;
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}
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file_recovery_new->extension=file_hint_arj.extension;
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file_recovery_new->time=le32(arj->ctime);
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if(file_recovery_new->time < le32(arj->mtime))
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file_recovery_new->time=le32(arj->mtime);
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return 1;
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}
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return 0;
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}
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static void register_header_check_arj(file_stat_t *file_stat)
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{
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static const unsigned char arj_header[2]={0x60, 0xEA};
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register_header_check(0, arj_header,sizeof(arj_header), &header_check_arj, file_stat);
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}
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#endif
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