// /*************************************************************************** // The Disc Image Chef // ---------------------------------------------------------------------------- // // Filename : Reiser.cs // Author(s) : Natalia Portillo // // Component : Reiser filesystem plugin // // --[ Description ] ---------------------------------------------------------- // // Identifies the Reiser filesystem and shows information. // // --[ License ] -------------------------------------------------------------- // // This library is free software; you can redistribute it and/or modify // it under the terms of the GNU Lesser General Public License as // published by the Free Software Foundation; either version 2.1 of the // License, or (at your option) any later version. // // This library is distributed in the hope that it will be useful, but // WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU // Lesser General Public License for more details. // // You should have received a copy of the GNU Lesser General Public // License along with this library; if not, see . // // ---------------------------------------------------------------------------- // Copyright © 2011-2019 Natalia Portillo // ****************************************************************************/ using System; using System.Linq; using System.Runtime.InteropServices; using System.Text; using DiscImageChef.CommonTypes; using DiscImageChef.CommonTypes.Interfaces; using Schemas; using Marshal = DiscImageChef.Helpers.Marshal; namespace DiscImageChef.Filesystems { public class Reiser : IFilesystem { const uint REISER_SUPER_OFFSET = 0x10000; readonly byte[] reiser35_magic = {0x52, 0x65, 0x49, 0x73, 0x45, 0x72, 0x46, 0x73, 0x00, 0x00}; readonly byte[] reiser36_magic = {0x52, 0x65, 0x49, 0x73, 0x45, 0x72, 0x32, 0x46, 0x73, 0x00}; readonly byte[] reiserJr_magic = {0x52, 0x65, 0x49, 0x73, 0x45, 0x72, 0x33, 0x46, 0x73, 0x00}; public FileSystemType XmlFsType { get; private set; } public Encoding Encoding { get; private set; } public string Name => "Reiser Filesystem Plugin"; public Guid Id => new Guid("1D8CD8B8-27E6-410F-9973-D16409225FBA"); public string Author => "Natalia Portillo"; public bool Identify(IMediaImage imagePlugin, Partition partition) { if(imagePlugin.Info.SectorSize < 512) return false; uint sbAddr = REISER_SUPER_OFFSET / imagePlugin.Info.SectorSize; if(sbAddr == 0) sbAddr = 1; uint sbSize = (uint)(Marshal.SizeOf() / imagePlugin.Info.SectorSize); if(Marshal.SizeOf() % imagePlugin.Info.SectorSize != 0) sbSize++; if(partition.Start + sbAddr + sbSize >= partition.End) return false; byte[] sector = imagePlugin.ReadSectors(partition.Start + sbAddr, sbSize); if(sector.Length < Marshal.SizeOf()) return false; Reiser_Superblock reiserSb = Marshal.ByteArrayToStructureLittleEndian(sector); return reiser35_magic.SequenceEqual(reiserSb.magic) || reiser36_magic.SequenceEqual(reiserSb.magic) || reiserJr_magic.SequenceEqual(reiserSb.magic); } public void GetInformation(IMediaImage imagePlugin, Partition partition, out string information, Encoding encoding) { Encoding = encoding ?? Encoding.GetEncoding("iso-8859-15"); information = ""; if(imagePlugin.Info.SectorSize < 512) return; uint sbAddr = REISER_SUPER_OFFSET / imagePlugin.Info.SectorSize; if(sbAddr == 0) sbAddr = 1; uint sbSize = (uint)(Marshal.SizeOf() / imagePlugin.Info.SectorSize); if(Marshal.SizeOf() % imagePlugin.Info.SectorSize != 0) sbSize++; byte[] sector = imagePlugin.ReadSectors(partition.Start + sbAddr, sbSize); if(sector.Length < Marshal.SizeOf()) return; Reiser_Superblock reiserSb = Marshal.ByteArrayToStructureLittleEndian(sector); if(!reiser35_magic.SequenceEqual(reiserSb.magic) && !reiser36_magic.SequenceEqual(reiserSb.magic) && !reiserJr_magic.SequenceEqual(reiserSb.magic)) return; StringBuilder sb = new StringBuilder(); if(reiser35_magic.SequenceEqual(reiserSb.magic)) sb.AppendLine("Reiser 3.5 filesystem"); else if(reiser36_magic.SequenceEqual(reiserSb.magic)) sb.AppendLine("Reiser 3.6 filesystem"); else if(reiserJr_magic.SequenceEqual(reiserSb.magic)) sb.AppendLine("Reiser Jr. filesystem"); sb.AppendFormat("Volume has {0} blocks with {1} blocks free", reiserSb.block_count, reiserSb.free_blocks) .AppendLine(); sb.AppendFormat("{0} bytes per block", reiserSb.blocksize).AppendLine(); sb.AppendFormat("Root directory resides on block {0}", reiserSb.root_block).AppendLine(); if(reiserSb.umount_state == 2) sb.AppendLine("Volume has not been cleanly umounted"); sb.AppendFormat("Volume last checked on {0}", DateHandlers.UnixUnsignedToDateTime(reiserSb.last_check)) .AppendLine(); if(reiserSb.version >= 2) { sb.AppendFormat("Volume UUID: {0}", reiserSb.uuid).AppendLine(); sb.AppendFormat("Volume name: {0}", Encoding.GetString(reiserSb.label)).AppendLine(); } information = sb.ToString(); XmlFsType = new FileSystemType(); if(reiser35_magic.SequenceEqual(reiserSb.magic)) XmlFsType.Type = "Reiser 3.5 filesystem"; else if(reiser36_magic.SequenceEqual(reiserSb.magic)) XmlFsType.Type = "Reiser 3.6 filesystem"; else if(reiserJr_magic.SequenceEqual(reiserSb.magic)) XmlFsType.Type = "Reiser Jr. filesystem"; XmlFsType.ClusterSize = reiserSb.blocksize; XmlFsType.Clusters = reiserSb.block_count; XmlFsType.FreeClusters = reiserSb.free_blocks; XmlFsType.FreeClustersSpecified = true; XmlFsType.Dirty = reiserSb.umount_state == 2; if(reiserSb.version < 2) return; XmlFsType.VolumeName = Encoding.GetString(reiserSb.label); XmlFsType.VolumeSerial = reiserSb.uuid.ToString(); } [StructLayout(LayoutKind.Sequential, Pack = 1)] struct ReiserJournalParams { public uint journal_1stblock; public uint journal_dev; public uint journal_size; public uint journal_trans_max; public uint journal_magic; public uint journal_max_batch; public uint journal_max_commit_age; public uint journal_max_trans_age; } [StructLayout(LayoutKind.Sequential, Pack = 1)] struct Reiser_Superblock { public uint block_count; public uint free_blocks; public uint root_block; public ReiserJournalParams journal; public ushort blocksize; public ushort oid_maxsize; public ushort oid_cursize; public ushort umount_state; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 10)] public byte[] magic; public ushort fs_state; public uint hash_function_code; public ushort tree_height; public ushort bmap_nr; public ushort version; public ushort reserved_for_journal; public uint inode_generation; public uint flags; public Guid uuid; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)] public byte[] label; public ushort mnt_count; public ushort max_mnt_count; public uint last_check; public uint check_interval; [MarshalAs(UnmanagedType.ByValArray, SizeConst = 76)] public byte[] unused; } } }