105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/*
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File: file_dex.c
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Copyright (C) 2010 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_dex)
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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 <ctype.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_dex(file_stat_t *file_stat);
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const file_hint_t file_hint_dex= {
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.extension="dex",
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.description="Dalvik",
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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_dex
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};
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/* More information can be found at https://source.android.com/devices/tech/dalvik/dex-format.html */
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struct dex_header
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{
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unsigned char magic[8];
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uint32_t checksum;
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unsigned char signature[20];
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uint32_t file_size;
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uint32_t header_size;
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uint32_t endian_tag;
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uint32_t link_size;
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uint32_t link_off;
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uint32_t map_off;
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uint32_t strings_ids_size;
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uint32_t strings_ids_off;
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uint32_t type_ids_size;
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uint32_t type_ids_off;
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uint32_t proto_ids_size;
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uint32_t proto_ids_off;
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uint32_t field_ids_size;
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uint32_t field_ids_off;
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uint32_t method_ids_size;
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uint32_t method_ids_off;
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uint32_t class_def_size;
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uint32_t class_def_off;
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uint32_t data_size;
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uint32_t data_off;
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} __attribute__ ((gcc_struct, __packed__));
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/*@
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@ requires buffer_size >= sizeof(struct dex_header);
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@ requires separation: \separated(&file_hint_dex, 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_dex(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 dex_header *dex=(const struct dex_header*)buffer;
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if(!isdigit(buffer[4]) || !isdigit(buffer[5]) || !isdigit(buffer[6]) || buffer[7]!=0x00)
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return 0;
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if(le32(dex->header_size) < 0x28)
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return 0;
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if(le32(dex->header_size) >= le32(dex->file_size))
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return 0;
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension=file_hint_dex.extension;
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file_recovery_new->calculated_file_size=le32(dex->file_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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return 1;
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}
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static void register_header_check_dex(file_stat_t *file_stat)
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{
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static const unsigned char dex_header[4]= {'d','e','x','\n'};
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register_header_check(0, dex_header,sizeof(dex_header), &header_check_dex, file_stat);
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}
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#endif
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