126 lines
3.9 KiB
C
126 lines
3.9 KiB
C
/*
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File: file_vdi.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_vdi)
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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_vdi(file_stat_t *file_stat);
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const file_hint_t file_hint_vdi = {
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.extension = "vdi",
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.description = "Virtual desktop infrastructure 1.1",
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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_vdi
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};
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/* Image version. */
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#define VDI_VERSION_1_1 0x00010001
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/* Image type. */
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#define VDI_TYPE_DYNAMIC 1
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#define VDI_TYPE_STATIC 2
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typedef unsigned char uuid_t[16];
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typedef struct
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{
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char text[0x40];
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uint32_t signature;
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uint32_t version;
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uint32_t header_size;
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uint32_t image_type;
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uint32_t image_flags;
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char description[256];
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uint32_t offset_bmap;
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uint32_t offset_data;
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uint32_t cylinders; /* disk geometry, unused here */
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uint32_t heads; /* disk geometry, unused here */
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uint32_t sectors; /* disk geometry, unused here */
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uint32_t sector_size;
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uint32_t unused1;
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uint64_t disk_size;
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uint32_t block_size;
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uint32_t block_extra; /* unused here */
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uint32_t blocks_in_image;
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uint32_t blocks_allocated;
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uuid_t uuid_image;
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uuid_t uuid_last_snap;
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uuid_t uuid_link;
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uuid_t uuid_parent;
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uint64_t unused2[7];
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} VdiHeader;
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/*@
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@ requires buffer_size >= sizeof(VdiHeader);
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@ requires separation: \separated(&file_hint_vdi, 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_vdi(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 VdiHeader *header = (const VdiHeader *)buffer;
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uint64_t fs;
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const uint32_t offset_data = le32(header->offset_data);
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if(le32(header->version) != VDI_VERSION_1_1)
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return 0;
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if(offset_data < sizeof(VdiHeader))
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return 0;
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if(le32(header->image_type) != VDI_TYPE_STATIC)
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{
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension = file_hint_vdi.extension;
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file_recovery_new->min_filesize = offset_data;
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return 1;
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}
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fs = (uint64_t)le32(header->blocks_in_image) * le32(header->block_size);
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if(fs > PHOTOREC_MAX_FILE_SIZE)
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return 0;
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fs += offset_data;
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if(fs > PHOTOREC_MAX_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_vdi.extension;
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file_recovery_new->calculated_file_size = fs;
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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_vdi(file_stat_t *file_stat)
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{
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static const unsigned char vdi_header[4] = { 0x7f, 0x10, 0xda, 0xbe };
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register_header_check(0x40, vdi_header, sizeof(vdi_header), &header_check_vdi, file_stat);
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}
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#endif
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