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227 lines
8.5 KiB
C#
227 lines
8.5 KiB
C#
// /***************************************************************************
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// Aaru Data Preservation Suite
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// ----------------------------------------------------------------------------
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//
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// Filename : NILFS2.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : NILFS2 filesystem plugin.
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the NILFS2 filesystem and shows information.
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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 © 2011-2022 Natalia Portillo
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// ****************************************************************************/
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// ReSharper disable UnusedMember.Local
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namespace Aaru.Filesystems;
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using System;
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using System.Runtime.InteropServices;
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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.Helpers;
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using Schemas;
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using Marshal = Aaru.Helpers.Marshal;
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/// <inheritdoc />
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/// <summary>Implements detection of the New Implementation of a Log-structured File System v2</summary>
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public sealed class NILFS2 : IFilesystem
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{
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const ushort NILFS2_MAGIC = 0x3434;
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const uint NILFS2_SUPER_OFFSET = 1024;
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/// <inheritdoc />
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public FileSystemType XmlFsType { get; private set; }
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/// <inheritdoc />
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public Encoding Encoding { get; private set; }
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/// <inheritdoc />
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public string Name => "NILFS2 Plugin";
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/// <inheritdoc />
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public Guid Id => new("35224226-C5CC-48B5-8FFD-3781E91E86B6");
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/// <inheritdoc />
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public string Author => "Natalia Portillo";
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/// <inheritdoc />
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public bool Identify(IMediaImage imagePlugin, Partition partition)
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{
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if(imagePlugin.Info.SectorSize < 512)
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return false;
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uint sbAddr = NILFS2_SUPER_OFFSET / imagePlugin.Info.SectorSize;
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if(sbAddr == 0)
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sbAddr = 1;
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var sbSize = (uint)(Marshal.SizeOf<Superblock>() / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf<Superblock>() % imagePlugin.Info.SectorSize != 0)
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sbSize++;
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if(partition.Start + sbAddr + sbSize >= partition.End)
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return false;
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ErrorNumber errno = imagePlugin.ReadSectors(partition.Start + sbAddr, sbSize, out byte[] sector);
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if(errno != ErrorNumber.NoError)
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return false;
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if(sector.Length < Marshal.SizeOf<Superblock>())
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return false;
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Superblock nilfsSb = Marshal.ByteArrayToStructureLittleEndian<Superblock>(sector);
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return nilfsSb.magic == NILFS2_MAGIC;
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}
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/// <inheritdoc />
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public void GetInformation(IMediaImage imagePlugin, Partition partition, out string information, Encoding encoding)
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{
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Encoding = encoding ?? Encoding.UTF8;
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information = "";
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if(imagePlugin.Info.SectorSize < 512)
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return;
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uint sbAddr = NILFS2_SUPER_OFFSET / imagePlugin.Info.SectorSize;
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if(sbAddr == 0)
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sbAddr = 1;
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var sbSize = (uint)(Marshal.SizeOf<Superblock>() / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf<Superblock>() % imagePlugin.Info.SectorSize != 0)
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sbSize++;
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ErrorNumber errno = imagePlugin.ReadSectors(partition.Start + sbAddr, sbSize, out byte[] sector);
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if(errno != ErrorNumber.NoError)
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return;
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if(sector.Length < Marshal.SizeOf<Superblock>())
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return;
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Superblock nilfsSb = Marshal.ByteArrayToStructureLittleEndian<Superblock>(sector);
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if(nilfsSb.magic != NILFS2_MAGIC)
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return;
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var sb = new StringBuilder();
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sb.AppendLine("NILFS2 filesystem");
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sb.AppendFormat("Version {0}.{1}", nilfsSb.rev_level, nilfsSb.minor_rev_level).AppendLine();
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sb.AppendFormat("{0} bytes per block", 1 << (int)(nilfsSb.log_block_size + 10)).AppendLine();
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sb.AppendFormat("{0} bytes in volume", nilfsSb.dev_size).AppendLine();
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sb.AppendFormat("{0} blocks per segment", nilfsSb.blocks_per_segment).AppendLine();
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sb.AppendFormat("{0} segments", nilfsSb.nsegments).AppendLine();
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if(nilfsSb.creator_os == 0)
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sb.AppendLine("Filesystem created on Linux");
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else
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sb.AppendFormat("Creator OS code: {0}", nilfsSb.creator_os).AppendLine();
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sb.AppendFormat("{0} bytes per inode", nilfsSb.inode_size).AppendLine();
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sb.AppendFormat("Volume UUID: {0}", nilfsSb.uuid).AppendLine();
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sb.AppendFormat("Volume name: {0}", StringHandlers.CToString(nilfsSb.volume_name, Encoding)).AppendLine();
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sb.AppendFormat("Volume created on {0}", DateHandlers.UnixUnsignedToDateTime(nilfsSb.ctime)).AppendLine();
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sb.AppendFormat("Volume last mounted on {0}", DateHandlers.UnixUnsignedToDateTime(nilfsSb.mtime)).AppendLine();
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sb.AppendFormat("Volume last written on {0}", DateHandlers.UnixUnsignedToDateTime(nilfsSb.wtime)).AppendLine();
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information = sb.ToString();
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XmlFsType = new FileSystemType
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{
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Type = "NILFS2 filesystem",
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ClusterSize = (uint)(1 << (int)(nilfsSb.log_block_size + 10)),
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VolumeName = StringHandlers.CToString(nilfsSb.volume_name, Encoding),
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VolumeSerial = nilfsSb.uuid.ToString(),
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CreationDate = DateHandlers.UnixUnsignedToDateTime(nilfsSb.ctime),
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CreationDateSpecified = true,
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ModificationDate = DateHandlers.UnixUnsignedToDateTime(nilfsSb.wtime),
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ModificationDateSpecified = true
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};
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if(nilfsSb.creator_os == 0)
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XmlFsType.SystemIdentifier = "Linux";
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XmlFsType.Clusters = nilfsSb.dev_size / XmlFsType.ClusterSize;
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}
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enum State : ushort
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{
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Valid = 0x0001,
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Error = 0x0002,
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Resize = 0x0004
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}
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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readonly struct Superblock
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{
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public readonly uint rev_level;
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public readonly ushort minor_rev_level;
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public readonly ushort magic;
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public readonly ushort bytes;
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public readonly ushort flags;
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public readonly uint crc_seed;
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public readonly uint sum;
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public readonly uint log_block_size;
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public readonly ulong nsegments;
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public readonly ulong dev_size;
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public readonly ulong first_data_block;
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public readonly uint blocks_per_segment;
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public readonly uint r_segments_percentage;
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public readonly ulong last_cno;
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public readonly ulong last_pseg;
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public readonly ulong last_seq;
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public readonly ulong free_blocks_count;
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public readonly ulong ctime;
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public readonly ulong mtime;
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public readonly ulong wtime;
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public readonly ushort mnt_count;
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public readonly ushort max_mnt_count;
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public readonly State state;
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public readonly ushort errors;
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public readonly ulong lastcheck;
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public readonly uint checkinterval;
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public readonly uint creator_os;
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public readonly ushort def_resuid;
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public readonly ushort def_resgid;
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public readonly uint first_ino;
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public readonly ushort inode_size;
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public readonly ushort dat_entry_size;
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public readonly ushort checkpoint_size;
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public readonly ushort segment_usage_size;
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public readonly Guid uuid;
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 80)]
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public readonly byte[] volume_name;
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public readonly uint c_interval;
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public readonly uint c_block_max;
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public readonly ulong feature_compat;
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public readonly ulong feature_compat_ro;
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public readonly ulong feature_incompat;
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}
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} |