mirror of
https://github.com/aaru-dps/Aaru.git
synced 2025-12-16 19:24:25 +00:00
Natalia Portillo
828c1e3da0
Introduces constant fields for respective debug module names, replacing the hardcoded ones. This is done to standardize the naming convention, reduce redundancy and potentially avoid any typos or name mismatches across the project. This change makes the code more maintainable and easier to update in case module names need to be changed.
587 lines
22 KiB
C#
587 lines
22 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : Read.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Disk image plugins.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Reads Microsoft Hyper-V disk images.
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//
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// --[ License ] --------------------------------------------------------------
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//
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// This library is free software; you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as
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// published by the Free Software Foundation; either version 2.1 of the
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// License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful, but
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// WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2023 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Text;
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using Aaru.CommonTypes;
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using Aaru.CommonTypes.Enums;
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using Aaru.CommonTypes.Interfaces;
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using Aaru.Console;
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using Aaru.Helpers;
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namespace Aaru.DiscImages;
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public sealed partial class Vhdx
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{
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/// <inheritdoc />
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public ErrorNumber Open(IFilter imageFilter)
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{
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Stream stream = imageFilter.GetDataForkStream();
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stream.Seek(0, SeekOrigin.Begin);
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if(stream.Length < 512)
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return ErrorNumber.InvalidArgument;
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byte[] vhdxIdB = new byte[Marshal.SizeOf<Identifier>()];
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stream.EnsureRead(vhdxIdB, 0, Marshal.SizeOf<Identifier>());
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_id = Marshal.ByteArrayToStructureLittleEndian<Identifier>(vhdxIdB);
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if(_id.signature != VHDX_SIGNATURE)
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return ErrorNumber.InvalidArgument;
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_imageInfo.Application = Encoding.Unicode.GetString(_id.creator);
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stream.Seek(64 * 1024, SeekOrigin.Begin);
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byte[] vHdrB = new byte[Marshal.SizeOf<Header>()];
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stream.EnsureRead(vHdrB, 0, Marshal.SizeOf<Header>());
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_vHdr = Marshal.ByteArrayToStructureLittleEndian<Header>(vHdrB);
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if(_vHdr.Signature != VHDX_HEADER_SIG)
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{
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stream.Seek(128 * 1024, SeekOrigin.Begin);
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vHdrB = new byte[Marshal.SizeOf<Header>()];
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stream.EnsureRead(vHdrB, 0, Marshal.SizeOf<Header>());
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_vHdr = Marshal.ByteArrayToStructureLittleEndian<Header>(vHdrB);
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if(_vHdr.Signature != VHDX_HEADER_SIG)
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{
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AaruConsole.ErrorWriteLine(Localization.VHDX_header_not_found);
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return ErrorNumber.InvalidArgument;
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}
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}
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stream.Seek(192 * 1024, SeekOrigin.Begin);
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byte[] vRegTableB = new byte[Marshal.SizeOf<RegionTableHeader>()];
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stream.EnsureRead(vRegTableB, 0, Marshal.SizeOf<RegionTableHeader>());
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_vRegHdr = Marshal.ByteArrayToStructureLittleEndian<RegionTableHeader>(vRegTableB);
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if(_vRegHdr.signature != VHDX_REGION_SIG)
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{
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stream.Seek(256 * 1024, SeekOrigin.Begin);
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vRegTableB = new byte[Marshal.SizeOf<RegionTableHeader>()];
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stream.EnsureRead(vRegTableB, 0, Marshal.SizeOf<RegionTableHeader>());
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_vRegHdr = Marshal.ByteArrayToStructureLittleEndian<RegionTableHeader>(vRegTableB);
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if(_vRegHdr.signature != VHDX_REGION_SIG)
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{
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AaruConsole.ErrorWriteLine(Localization.VHDX_region_table_not_found);
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return ErrorNumber.InvalidArgument;
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}
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}
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_vRegs = new RegionTableEntry[_vRegHdr.entries];
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for(int i = 0; i < _vRegs.Length; i++)
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{
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byte[] vRegB = new byte[System.Runtime.InteropServices.Marshal.SizeOf(_vRegs[i])];
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stream.EnsureRead(vRegB, 0, System.Runtime.InteropServices.Marshal.SizeOf(_vRegs[i]));
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_vRegs[i] = Marshal.ByteArrayToStructureLittleEndian<RegionTableEntry>(vRegB);
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if(_vRegs[i].guid == _batGuid)
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_batOffset = (long)_vRegs[i].offset;
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else if(_vRegs[i].guid == _metadataGuid)
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_metadataOffset = (long)_vRegs[i].offset;
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else if((_vRegs[i].flags & REGION_FLAGS_REQUIRED) == REGION_FLAGS_REQUIRED)
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{
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AaruConsole.
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ErrorWriteLine(string.Format(Localization.Found_unsupported_and_required_region_Guid_0_not_proceeding_with_image,
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_vRegs[i].guid));
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return ErrorNumber.InvalidArgument;
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}
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}
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if(_batOffset == 0)
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{
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AaruConsole.ErrorWriteLine(Localization.BAT_not_found_cannot_continue);
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return ErrorNumber.InvalidArgument;
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}
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if(_metadataOffset == 0)
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{
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AaruConsole.ErrorWriteLine(Localization.Metadata_not_found_cannot_continue);
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return ErrorNumber.InvalidArgument;
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}
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uint fileParamsOff = 0, vdSizeOff = 0, p83Off = 0, logOff = 0, physOff = 0, parentOff = 0;
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stream.Seek(_metadataOffset, SeekOrigin.Begin);
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byte[] metTableB = new byte[Marshal.SizeOf<MetadataTableHeader>()];
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stream.EnsureRead(metTableB, 0, Marshal.SizeOf<MetadataTableHeader>());
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_vMetHdr = Marshal.ByteArrayToStructureLittleEndian<MetadataTableHeader>(metTableB);
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_vMets = new MetadataTableEntry[_vMetHdr.entries];
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for(int i = 0; i < _vMets.Length; i++)
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{
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byte[] vMetB = new byte[System.Runtime.InteropServices.Marshal.SizeOf(_vMets[i])];
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stream.EnsureRead(vMetB, 0, System.Runtime.InteropServices.Marshal.SizeOf(_vMets[i]));
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_vMets[i] = Marshal.ByteArrayToStructureLittleEndian<MetadataTableEntry>(vMetB);
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if(_vMets[i].itemId == _fileParametersGuid)
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fileParamsOff = _vMets[i].offset;
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else if(_vMets[i].itemId == _virtualDiskSizeGuid)
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vdSizeOff = _vMets[i].offset;
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else if(_vMets[i].itemId == _page83DataGuid)
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p83Off = _vMets[i].offset;
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else if(_vMets[i].itemId == _logicalSectorSizeGuid)
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logOff = _vMets[i].offset;
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else if(_vMets[i].itemId == _physicalSectorSizeGuid)
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physOff = _vMets[i].offset;
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else if(_vMets[i].itemId == _parentLocatorGuid)
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parentOff = _vMets[i].offset;
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else if((_vMets[i].flags & METADATA_FLAGS_REQUIRED) == METADATA_FLAGS_REQUIRED)
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{
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AaruConsole.
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ErrorWriteLine(string.Format(Localization.Found_unsupported_and_required_metadata_Guid_0_not_proceeding_with_image,
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_vMets[i].itemId));
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return ErrorNumber.InvalidArgument;
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}
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}
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byte[] tmp;
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if(fileParamsOff != 0)
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{
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stream.Seek(fileParamsOff + _metadataOffset, SeekOrigin.Begin);
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tmp = new byte[8];
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stream.EnsureRead(tmp, 0, 8);
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_vFileParms = new FileParameters
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{
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blockSize = BitConverter.ToUInt32(tmp, 0),
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flags = BitConverter.ToUInt32(tmp, 4)
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};
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}
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else
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{
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AaruConsole.ErrorWriteLine(Localization.File_parameters_not_found);
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return ErrorNumber.InvalidArgument;
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}
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if(vdSizeOff != 0)
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{
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stream.Seek(vdSizeOff + _metadataOffset, SeekOrigin.Begin);
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tmp = new byte[8];
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stream.EnsureRead(tmp, 0, 8);
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_virtualDiskSize = BitConverter.ToUInt64(tmp, 0);
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}
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else
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{
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AaruConsole.ErrorWriteLine(Localization.Virtual_disk_size_not_found);
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return ErrorNumber.InvalidArgument;
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}
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if(p83Off != 0)
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{
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stream.Seek(p83Off + _metadataOffset, SeekOrigin.Begin);
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tmp = new byte[16];
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stream.EnsureRead(tmp, 0, 16);
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_page83Data = new Guid(tmp);
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}
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if(logOff != 0)
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{
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stream.Seek(logOff + _metadataOffset, SeekOrigin.Begin);
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tmp = new byte[4];
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stream.EnsureRead(tmp, 0, 4);
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_logicalSectorSize = BitConverter.ToUInt32(tmp, 0);
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}
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else
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{
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AaruConsole.ErrorWriteLine(Localization.Logical_sector_size_not_found);
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return ErrorNumber.InvalidArgument;
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}
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if(physOff != 0)
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{
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stream.Seek(physOff + _metadataOffset, SeekOrigin.Begin);
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tmp = new byte[4];
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stream.EnsureRead(tmp, 0, 4);
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_physicalSectorSize = BitConverter.ToUInt32(tmp, 0);
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}
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else
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{
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AaruConsole.ErrorWriteLine(Localization.Physical_sector_size_not_found);
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return ErrorNumber.InvalidArgument;
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}
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if(parentOff != 0 &&
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(_vFileParms.flags & FILE_FLAGS_HAS_PARENT) == FILE_FLAGS_HAS_PARENT)
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{
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stream.Seek(parentOff + _metadataOffset, SeekOrigin.Begin);
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byte[] vParHdrB = new byte[Marshal.SizeOf<ParentLocatorHeader>()];
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stream.EnsureRead(vParHdrB, 0, Marshal.SizeOf<ParentLocatorHeader>());
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_vParHdr = Marshal.ByteArrayToStructureLittleEndian<ParentLocatorHeader>(vParHdrB);
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if(_vParHdr.locatorType != _parentTypeVhdxGuid)
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{
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AaruConsole.
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ErrorWriteLine(string.Format(Localization.Found_unsupported_and_required_parent_locator_type_0_not_proceeding_with_image,
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_vParHdr.locatorType));
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return ErrorNumber.NotSupported;
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}
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_vPars = new ParentLocatorEntry[_vParHdr.keyValueCount];
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for(int i = 0; i < _vPars.Length; i++)
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{
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byte[] vParB = new byte[System.Runtime.InteropServices.Marshal.SizeOf(_vPars[i])];
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stream.EnsureRead(vParB, 0, System.Runtime.InteropServices.Marshal.SizeOf(_vPars[i]));
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_vPars[i] = Marshal.ByteArrayToStructureLittleEndian<ParentLocatorEntry>(vParB);
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}
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}
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else if((_vFileParms.flags & FILE_FLAGS_HAS_PARENT) == FILE_FLAGS_HAS_PARENT)
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{
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AaruConsole.ErrorWriteLine(Localization.Parent_locator_not_found);
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return ErrorNumber.NoSuchFile;
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}
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if((_vFileParms.flags & FILE_FLAGS_HAS_PARENT) == FILE_FLAGS_HAS_PARENT &&
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_vParHdr.locatorType == _parentTypeVhdxGuid)
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{
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_parentImage = new Vhdx();
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bool parentWorks = false;
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foreach(ParentLocatorEntry parentEntry in _vPars)
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{
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stream.Seek(parentEntry.keyOffset + _metadataOffset, SeekOrigin.Begin);
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byte[] tmpKey = new byte[parentEntry.keyLength];
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stream.EnsureRead(tmpKey, 0, tmpKey.Length);
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string entryType = Encoding.Unicode.GetString(tmpKey);
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IFilter parentFilter;
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if(string.Compare(entryType, RELATIVE_PATH_KEY, StringComparison.OrdinalIgnoreCase) == 0)
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{
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stream.Seek(parentEntry.valueOffset + _metadataOffset, SeekOrigin.Begin);
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byte[] tmpVal = new byte[parentEntry.valueLength];
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stream.EnsureRead(tmpVal, 0, tmpVal.Length);
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string entryValue = Encoding.Unicode.GetString(tmpVal);
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try
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{
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parentFilter = new FiltersList().GetFilter(Path.Combine(imageFilter.ParentFolder, entryValue));
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if(parentFilter != null &&
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_parentImage.Open(parentFilter) == ErrorNumber.NoError)
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{
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parentWorks = true;
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break;
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}
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}
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catch
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{
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parentWorks = false;
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}
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string relEntry = Path.Combine(Path.GetDirectoryName(imageFilter.Path), entryValue);
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try
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{
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parentFilter = new FiltersList().GetFilter(Path.Combine(imageFilter.ParentFolder, relEntry));
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if(parentFilter == null ||
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_parentImage.Open(parentFilter) != ErrorNumber.NoError)
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continue;
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parentWorks = true;
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break;
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}
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catch
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{
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// ignored
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}
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}
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else if(string.Compare(entryType, VOLUME_PATH_KEY, StringComparison.OrdinalIgnoreCase) == 0 ||
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string.Compare(entryType, ABSOLUTE_WIN32_PATH_KEY, StringComparison.OrdinalIgnoreCase) == 0)
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{
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stream.Seek(parentEntry.valueOffset + _metadataOffset, SeekOrigin.Begin);
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byte[] tmpVal = new byte[parentEntry.valueLength];
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stream.EnsureRead(tmpVal, 0, tmpVal.Length);
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string entryValue = Encoding.Unicode.GetString(tmpVal);
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try
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{
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parentFilter = new FiltersList().GetFilter(Path.Combine(imageFilter.ParentFolder, entryValue));
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if(parentFilter == null ||
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_parentImage.Open(parentFilter) != ErrorNumber.NoError)
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continue;
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parentWorks = true;
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break;
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}
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catch
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{
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// ignored
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}
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}
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}
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if(!parentWorks)
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{
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AaruConsole.ErrorWriteLine(Localization.Image_is_differential_but_parent_cannot_be_opened);
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return ErrorNumber.InOutError;
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}
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_hasParent = true;
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}
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_chunkRatio = (long)(Math.Pow(2, 23) * _logicalSectorSize / _vFileParms.blockSize);
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_dataBlocks = _virtualDiskSize / _vFileParms.blockSize;
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if(_virtualDiskSize % _vFileParms.blockSize > 0)
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_dataBlocks++;
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long batEntries;
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if(_hasParent)
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{
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long sectorBitmapBlocks = (long)_dataBlocks / _chunkRatio;
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if(_dataBlocks % (ulong)_chunkRatio > 0)
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sectorBitmapBlocks++;
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_sectorBitmapPointers = new ulong[sectorBitmapBlocks];
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batEntries = sectorBitmapBlocks * (_chunkRatio - 1);
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}
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else
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batEntries = (long)(_dataBlocks + ((_dataBlocks - 1) / (ulong)_chunkRatio));
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AaruConsole.DebugWriteLine(MODULE_NAME, Localization.Reading_BAT);
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long readChunks = 0;
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_blockAllocationTable = new ulong[_dataBlocks];
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byte[] batB = new byte[batEntries * 8];
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stream.Seek(_batOffset, SeekOrigin.Begin);
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stream.EnsureRead(batB, 0, batB.Length);
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ulong skipSize = 0;
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for(ulong i = 0; i < _dataBlocks; i++)
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if(readChunks == _chunkRatio)
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{
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if(_hasParent)
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_sectorBitmapPointers[skipSize / 8] = BitConverter.ToUInt64(batB, (int)((i * 8) + skipSize));
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readChunks = 0;
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skipSize += 8;
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}
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else
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{
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_blockAllocationTable[i] = BitConverter.ToUInt64(batB, (int)((i * 8) + skipSize));
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readChunks++;
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}
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if(_hasParent)
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{
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AaruConsole.DebugWriteLine(MODULE_NAME, Localization.Reading_Sector_Bitmap);
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var sectorBmpMs = new MemoryStream();
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foreach(ulong pt in _sectorBitmapPointers)
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switch(pt & BAT_FLAGS_MASK)
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{
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case SECTOR_BITMAP_NOT_PRESENT:
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sectorBmpMs.Write(new byte[1048576], 0, 1048576);
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break;
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case SECTOR_BITMAP_PRESENT:
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stream.Seek((long)((pt & BAT_FILE_OFFSET_MASK) * 1048576), SeekOrigin.Begin);
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byte[] bmp = new byte[1048576];
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stream.EnsureRead(bmp, 0, bmp.Length);
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sectorBmpMs.Write(bmp, 0, bmp.Length);
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break;
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default:
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if((pt & BAT_FLAGS_MASK) != 0)
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{
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AaruConsole.
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ErrorWriteLine(string.
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Format(Localization.Unsupported_sector_bitmap_block_flags_0_found_not_proceeding,
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pt & BAT_FLAGS_MASK));
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return ErrorNumber.InvalidArgument;
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}
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break;
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}
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_sectorBitmap = sectorBmpMs.ToArray();
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sectorBmpMs.Close();
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}
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_maxBlockCache = (int)(MAX_CACHE_SIZE / _vFileParms.blockSize);
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_maxSectorCache = (int)(MAX_CACHE_SIZE / _logicalSectorSize);
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_imageStream = stream;
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_sectorCache = new Dictionary<ulong, byte[]>();
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_blockCache = new Dictionary<ulong, byte[]>();
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_imageInfo.CreationTime = imageFilter.CreationTime;
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_imageInfo.LastModificationTime = imageFilter.LastWriteTime;
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_imageInfo.MediaTitle = Path.GetFileNameWithoutExtension(imageFilter.Filename);
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_imageInfo.SectorSize = _logicalSectorSize;
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_imageInfo.MetadataMediaType = MetadataMediaType.BlockMedia;
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_imageInfo.MediaType = MediaType.GENERIC_HDD;
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_imageInfo.ImageSize = _virtualDiskSize;
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_imageInfo.Sectors = _imageInfo.ImageSize / _imageInfo.SectorSize;
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_imageInfo.DriveSerialNumber = _page83Data.ToString();
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// TODO: Separate image application from version, need several samples.
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_imageInfo.Cylinders = (uint)(_imageInfo.Sectors / 16 / 63);
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_imageInfo.Heads = 16;
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_imageInfo.SectorsPerTrack = 63;
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return ErrorNumber.NoError;
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}
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/// <inheritdoc />
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public ErrorNumber ReadSector(ulong sectorAddress, out byte[] buffer)
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{
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buffer = null;
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if(sectorAddress > _imageInfo.Sectors - 1)
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return ErrorNumber.OutOfRange;
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|
|
|
if(_sectorCache.TryGetValue(sectorAddress, out buffer))
|
|
return ErrorNumber.NoError;
|
|
|
|
ulong index = sectorAddress * _logicalSectorSize / _vFileParms.blockSize;
|
|
ulong secOff = sectorAddress * _logicalSectorSize % _vFileParms.blockSize;
|
|
|
|
ulong blkPtr = _blockAllocationTable[index];
|
|
ulong blkFlags = blkPtr & BAT_FLAGS_MASK;
|
|
|
|
if((blkPtr & BAT_RESERVED_MASK) != 0)
|
|
{
|
|
AaruConsole.ErrorWriteLine($"Unknown flags (0x{blkPtr & BAT_RESERVED_MASK:X16}) set in block pointer");
|
|
|
|
return ErrorNumber.InvalidArgument;
|
|
}
|
|
|
|
switch(blkFlags & BAT_FLAGS_MASK)
|
|
{
|
|
case PAYLOAD_BLOCK_NOT_PRESENT:
|
|
if(_hasParent)
|
|
return _parentImage.ReadSector(sectorAddress, out buffer);
|
|
|
|
buffer = new byte[_logicalSectorSize];
|
|
|
|
return ErrorNumber.NoError;
|
|
case PAYLOAD_BLOCK_UNDEFINED:
|
|
case PAYLOAD_BLOCK_ZERO:
|
|
case PAYLOAD_BLOCK_UNMAPPER:
|
|
buffer = new byte[_logicalSectorSize];
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
|
|
bool partialBlock = (blkFlags & BAT_FLAGS_MASK) == PAYLOAD_BLOCK_PARTIALLY_PRESENT;
|
|
|
|
if(partialBlock &&
|
|
_hasParent &&
|
|
!CheckBitmap(sectorAddress))
|
|
return _parentImage.ReadSector(sectorAddress, out buffer);
|
|
|
|
if(!_blockCache.TryGetValue(blkPtr & BAT_FILE_OFFSET_MASK, out byte[] block))
|
|
{
|
|
block = new byte[_vFileParms.blockSize];
|
|
_imageStream.Seek((long)(blkPtr & BAT_FILE_OFFSET_MASK), SeekOrigin.Begin);
|
|
_imageStream.EnsureRead(block, 0, block.Length);
|
|
|
|
if(_blockCache.Count >= _maxBlockCache)
|
|
_blockCache.Clear();
|
|
|
|
_blockCache.Add(blkPtr & BAT_FILE_OFFSET_MASK, block);
|
|
}
|
|
|
|
buffer = new byte[_logicalSectorSize];
|
|
Array.Copy(block, (int)secOff, buffer, 0, buffer.Length);
|
|
|
|
if(_sectorCache.Count >= _maxSectorCache)
|
|
_sectorCache.Clear();
|
|
|
|
_sectorCache.Add(sectorAddress, buffer);
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
|
|
/// <inheritdoc />
|
|
public ErrorNumber ReadSectors(ulong sectorAddress, uint length, out byte[] buffer)
|
|
{
|
|
buffer = null;
|
|
|
|
if(sectorAddress > _imageInfo.Sectors - 1)
|
|
return ErrorNumber.OutOfRange;
|
|
|
|
if(sectorAddress + length > _imageInfo.Sectors)
|
|
return ErrorNumber.OutOfRange;
|
|
|
|
var ms = new MemoryStream();
|
|
|
|
for(uint i = 0; i < length; i++)
|
|
{
|
|
ErrorNumber errno = ReadSector(sectorAddress + i, out byte[] sector);
|
|
|
|
if(errno != ErrorNumber.NoError)
|
|
return errno;
|
|
|
|
ms.Write(sector, 0, sector.Length);
|
|
}
|
|
|
|
buffer = ms.ToArray();
|
|
|
|
return ErrorNumber.NoError;
|
|
}
|
|
} |