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359 lines
20 KiB
C#
359 lines
20 KiB
C#
// /***************************************************************************
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// The Disc Image Chef
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// ----------------------------------------------------------------------------
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//
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// Filename : Locus.cs
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// Author(s) : Natalia Portillo <claunia@claunia.com>
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//
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// Component : Locus filesystem plugin
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//
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// --[ Description ] ----------------------------------------------------------
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//
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// Identifies the Locus 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 aint with this library; if not, see <http://www.gnu.org/licenses/>.
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//
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// ----------------------------------------------------------------------------
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// Copyright © 2011-2018 Natalia Portillo
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// ****************************************************************************/
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using System;
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using System.Diagnostics.CodeAnalysis;
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using System.Runtime.InteropServices;
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using System.Text;
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using DiscImageChef.CommonTypes;
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using DiscImageChef.CommonTypes.Interfaces;
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using DiscImageChef.Console;
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using Schemas;
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// Commit count
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using commitcnt_t = System.Int32;
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// Disk address
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using daddr_t = System.Int32;
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// Fstore
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using fstore_t = System.Int32;
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// Global File System number
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using gfs_t = System.Int32;
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// Inode number
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using ino_t = System.Int32;
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// Filesystem pack number
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using pckno_t = System.Int16;
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// Timestamp
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using time_t = System.Int32;
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namespace DiscImageChef.Filesystems
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{
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public class Locus : IFilesystem
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{
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const int NICINOD = 325;
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const int NICFREE = 600;
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const int OLDNICINOD = 700;
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const int OLDNICFREE = 500;
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const uint LOCUS_MAGIC = 0xFFEEDDCD;
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const uint LOCUS_CIGAM = 0xCDDDEEFF;
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const uint LOCUS_MAGIC_OLD = 0xFFEEDDCC;
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const uint LOCUS_CIGAM_OLD = 0xCCDDEEFF;
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public FileSystemType XmlFsType { get; private set; }
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public Encoding Encoding { get; private set; }
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public string Name => "Locus Filesystem Plugin";
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public Guid Id => new Guid("1A70B30A-437D-479A-88E1-D0C9C1797FF4");
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public string Author => "Natalia Portillo";
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public bool Identify(IMediaImage imagePlugin, Partition partition)
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{
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if(imagePlugin.Info.SectorSize < 512) return false;
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for(ulong location = 0; location <= 8; location++)
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{
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Locus_Superblock locusSb = new Locus_Superblock();
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uint sbSize = (uint)(Marshal.SizeOf(locusSb) / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf(locusSb) % imagePlugin.Info.SectorSize != 0) sbSize++;
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if(partition.Start + location + sbSize >= imagePlugin.Info.Sectors) break;
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byte[] sector = imagePlugin.ReadSectors(partition.Start + location, sbSize);
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if(sector.Length < Marshal.SizeOf(locusSb)) return false;
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IntPtr sbPtr = Marshal.AllocHGlobal(Marshal.SizeOf(locusSb));
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Marshal.Copy(sector, 0, sbPtr, Marshal.SizeOf(locusSb));
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locusSb = (Locus_Superblock)Marshal.PtrToStructure(sbPtr, typeof(Locus_Superblock));
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Marshal.FreeHGlobal(sbPtr);
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DicConsole.DebugWriteLine("Locus plugin", "magic at {1} = 0x{0:X8}", locusSb.s_magic, location);
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if(locusSb.s_magic == LOCUS_MAGIC || locusSb.s_magic == LOCUS_CIGAM ||
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locusSb.s_magic == LOCUS_MAGIC_OLD || locusSb.s_magic == LOCUS_CIGAM_OLD) return true;
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}
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return false;
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}
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public void GetInformation(IMediaImage imagePlugin, Partition partition, out string information,
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Encoding encoding)
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{
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Encoding = encoding ?? Encoding.GetEncoding("iso-8859-15");
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information = "";
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if(imagePlugin.Info.SectorSize < 512) return;
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Locus_Superblock locusSb = new Locus_Superblock();
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byte[] sector = null;
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for(ulong location = 0; location <= 8; location++)
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{
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uint sbSize = (uint)(Marshal.SizeOf(locusSb) / imagePlugin.Info.SectorSize);
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if(Marshal.SizeOf(locusSb) % imagePlugin.Info.SectorSize != 0) sbSize++;
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sector = imagePlugin.ReadSectors(partition.Start + location, sbSize);
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if(sector.Length < Marshal.SizeOf(locusSb)) return;
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IntPtr sbPtr = Marshal.AllocHGlobal(Marshal.SizeOf(locusSb));
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Marshal.Copy(sector, 0, sbPtr, Marshal.SizeOf(locusSb));
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locusSb = (Locus_Superblock)Marshal.PtrToStructure(sbPtr, typeof(Locus_Superblock));
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Marshal.FreeHGlobal(sbPtr);
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if(locusSb.s_magic == LOCUS_MAGIC || locusSb.s_magic == LOCUS_CIGAM ||
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locusSb.s_magic == LOCUS_MAGIC_OLD || locusSb.s_magic == LOCUS_CIGAM_OLD) break;
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}
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// We don't care about old version for information
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if(locusSb.s_magic != LOCUS_MAGIC && locusSb.s_magic != LOCUS_CIGAM && locusSb.s_magic != LOCUS_MAGIC_OLD &&
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locusSb.s_magic != LOCUS_CIGAM_OLD) return;
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// Numerical arrays are not important for information so no need to swap them
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if(locusSb.s_magic == LOCUS_CIGAM || locusSb.s_magic == LOCUS_CIGAM_OLD)
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{
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locusSb = BigEndianMarshal.ByteArrayToStructureBigEndian<Locus_Superblock>(sector);
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locusSb.s_flags = (LocusFlags)Swapping.Swap((ushort)locusSb.s_flags);
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}
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StringBuilder sb = new StringBuilder();
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sb.AppendLine(locusSb.s_magic == LOCUS_MAGIC_OLD ? "Locus filesystem (old)" : "Locus filesystem");
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int blockSize = locusSb.s_version == LocusVersion.SB_SB4096 ? 4096 : 1024;
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string s_fsmnt = StringHandlers.CToString(locusSb.s_fsmnt, Encoding);
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string s_fpack = StringHandlers.CToString(locusSb.s_fpack, Encoding);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_magic = 0x{0:X8}", locusSb.s_magic);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_gfs = {0}", locusSb.s_gfs);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_fsize = {0}", locusSb.s_fsize);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_lwm = {0}", locusSb.s_lwm);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_hwm = {0}", locusSb.s_hwm);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_llst = {0}", locusSb.s_llst);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_fstore = {0}", locusSb.s_fstore);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_time = {0}", locusSb.s_time);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_tfree = {0}", locusSb.s_tfree);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_isize = {0}", locusSb.s_isize);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_nfree = {0}", locusSb.s_nfree);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_flags = {0}", locusSb.s_flags);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_tinode = {0}", locusSb.s_tinode);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_lasti = {0}", locusSb.s_lasti);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_nbehind = {0}", locusSb.s_nbehind);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_gfspack = {0}", locusSb.s_gfspack);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_ninode = {0}", locusSb.s_ninode);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_flock = {0}", locusSb.s_flock);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_ilock = {0}", locusSb.s_ilock);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_fmod = {0}", locusSb.s_fmod);
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DicConsole.DebugWriteLine("Locus plugin", "LocusSb.s_version = {0}", locusSb.s_version);
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sb.AppendFormat("Superblock last modified on {0}", DateHandlers.UnixToDateTime(locusSb.s_time))
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.AppendLine();
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sb.AppendFormat("Volume has {0} blocks of {1} bytes each (total {2} bytes)", locusSb.s_fsize, blockSize,
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locusSb.s_fsize * blockSize).AppendLine();
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sb.AppendFormat("{0} blocks free ({1} bytes)", locusSb.s_tfree, locusSb.s_tfree * blockSize).AppendLine();
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sb.AppendFormat("I-node list uses {0} blocks", locusSb.s_isize).AppendLine();
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sb.AppendFormat("{0} free inodes", locusSb.s_tinode).AppendLine();
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sb.AppendFormat("Next free inode search will start at inode {0}", locusSb.s_lasti).AppendLine();
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sb.AppendFormat("There are an estimate of {0} free inodes before next search start", locusSb.s_nbehind)
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.AppendLine();
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if(locusSb.s_flags.HasFlag(LocusFlags.SB_RDONLY)) sb.AppendLine("Read-only volume");
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if(locusSb.s_flags.HasFlag(LocusFlags.SB_CLEAN)) sb.AppendLine("Clean volume");
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if(locusSb.s_flags.HasFlag(LocusFlags.SB_DIRTY)) sb.AppendLine("Dirty volume");
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if(locusSb.s_flags.HasFlag(LocusFlags.SB_RMV)) sb.AppendLine("Removable volume");
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if(locusSb.s_flags.HasFlag(LocusFlags.SB_PRIMPACK)) sb.AppendLine("This is the primary pack");
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if(locusSb.s_flags.HasFlag(LocusFlags.SB_REPLTYPE)) sb.AppendLine("Replicated volume");
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if(locusSb.s_flags.HasFlag(LocusFlags.SB_USER)) sb.AppendLine("User replicated volume");
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if(locusSb.s_flags.HasFlag(LocusFlags.SB_BACKBONE)) sb.AppendLine("Backbone volume");
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if(locusSb.s_flags.HasFlag(LocusFlags.SB_NFS)) sb.AppendLine("NFS volume");
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if(locusSb.s_flags.HasFlag(LocusFlags.SB_BYHAND)) sb.AppendLine("Volume inhibits automatic fsck");
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if(locusSb.s_flags.HasFlag(LocusFlags.SB_NOSUID)) sb.AppendLine("Set-uid/set-gid is disabled");
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if(locusSb.s_flags.HasFlag(LocusFlags.SB_SYNCW)) sb.AppendLine("Volume uses synchronous writes");
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sb.AppendFormat("Volume label: {0}", s_fsmnt).AppendLine();
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sb.AppendFormat("Physical volume name: {0}", s_fpack).AppendLine();
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sb.AppendFormat("Global File System number: {0}", locusSb.s_gfs).AppendLine();
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sb.AppendFormat("Global File System pack number {0}", locusSb.s_gfspack).AppendLine();
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information = sb.ToString();
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XmlFsType = new FileSystemType
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{
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Type = "Locus filesystem",
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ClusterSize = blockSize,
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Clusters = locusSb.s_fsize,
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// Sometimes it uses one, or the other. Use the bigger
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VolumeName = string.IsNullOrEmpty(s_fsmnt) ? s_fpack : s_fsmnt,
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ModificationDate = DateHandlers.UnixToDateTime(locusSb.s_time),
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ModificationDateSpecified = true,
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Dirty = !locusSb.s_flags.HasFlag(LocusFlags.SB_CLEAN) ||
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locusSb.s_flags.HasFlag(LocusFlags.SB_DIRTY),
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FreeClusters = locusSb.s_tfree,
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FreeClustersSpecified = true
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};
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}
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[SuppressMessage("ReSharper", "InconsistentNaming")]
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[SuppressMessage("ReSharper", "BuiltInTypeReferenceStyle")]
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct Locus_Superblock
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{
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public uint s_magic; /* identifies this as a locus filesystem */
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/* defined as a constant below */
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public gfs_t s_gfs; /* global filesystem number */
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public daddr_t s_fsize; /* size in blocks of entire volume */
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/* several ints for replicated filsystems */
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public commitcnt_t s_lwm; /* all prior commits propagated */
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public commitcnt_t s_hwm; /* highest commit propagated */
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/* oldest committed version in the list.
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* llst mod NCMTLST is the offset of commit #llst in the list,
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* which wraps around from there.
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*/
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public commitcnt_t s_llst;
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public fstore_t s_fstore; /* filesystem storage bit mask; if the
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filsys is replicated and this is not a
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primary or backbone copy, this bit mask
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determines which files are stored */
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public time_t s_time; /* last super block update */
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public daddr_t s_tfree; /* total free blocks*/
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public ino_t s_isize; /* size in blocks of i-list */
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public short s_nfree; /* number of addresses in s_free */
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public LocusFlags s_flags; /* filsys flags, defined below */
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public ino_t s_tinode; /* total free inodes */
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public ino_t s_lasti; /* start place for circular search */
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public ino_t s_nbehind; /* est # free inodes before s_lasti */
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public pckno_t s_gfspack; /* global filesystem pack number */
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public short s_ninode; /* number of i-nodes in s_inode */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
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public short[] s_dinfo; /* interleave stuff */
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//#define s_m s_dinfo[0]
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//#define s_skip s_dinfo[0] /* AIX defines */
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//#define s_n s_dinfo[1]
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//#define s_cyl s_dinfo[1] /* AIX defines */
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public byte s_flock; /* lock during free list manipulation */
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public byte s_ilock; /* lock during i-list manipulation */
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public byte s_fmod; /* super block modified flag */
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public LocusVersion s_version; /* version of the data format in fs. */
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/* defined below. */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
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public byte[] s_fsmnt; /* name of this file system */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
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public byte[] s_fpack; /* name of this physical volume */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = NICINOD)]
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public ino_t[] s_inode; /* free i-node list */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = NICFREE)]
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public daddr_t[] su_free; /* free block list for non-replicated filsys */
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public byte s_byteorder; /* byte order of integers */
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}
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[SuppressMessage("ReSharper", "InconsistentNaming")]
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[SuppressMessage("ReSharper", "BuiltInTypeReferenceStyle")]
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[StructLayout(LayoutKind.Sequential, Pack = 1)]
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struct Locus_OldSuperblock
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{
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public uint s_magic; /* identifies this as a locus filesystem */
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/* defined as a constant below */
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public gfs_t s_gfs; /* global filesystem number */
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public daddr_t s_fsize; /* size in blocks of entire volume */
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/* several ints for replicated filsystems */
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public commitcnt_t s_lwm; /* all prior commits propagated */
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public commitcnt_t s_hwm; /* highest commit propagated */
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/* oldest committed version in the list.
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* llst mod NCMTLST is the offset of commit #llst in the list,
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* which wraps around from there.
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*/
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public commitcnt_t s_llst;
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public fstore_t s_fstore; /* filesystem storage bit mask; if the
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filsys is replicated and this is not a
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primary or backbone copy, this bit mask
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determines which files are stored */
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public time_t s_time; /* last super block update */
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public daddr_t s_tfree; /* total free blocks*/
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public ino_t s_isize; /* size in blocks of i-list */
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public short s_nfree; /* number of addresses in s_free */
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public LocusFlags s_flags; /* filsys flags, defined below */
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public ino_t s_tinode; /* total free inodes */
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public ino_t s_lasti; /* start place for circular search */
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public ino_t s_nbehind; /* est # free inodes before s_lasti */
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public pckno_t s_gfspack; /* global filesystem pack number */
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public short s_ninode; /* number of i-nodes in s_inode */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)]
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public short[] s_dinfo; /* interleave stuff */
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//#define s_m s_dinfo[0]
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//#define s_skip s_dinfo[0] /* AIX defines */
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//#define s_n s_dinfo[1]
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//#define s_cyl s_dinfo[1] /* AIX defines */
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public byte s_flock; /* lock during free list manipulation */
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public byte s_ilock; /* lock during i-list manipulation */
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public byte s_fmod; /* super block modified flag */
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public LocusVersion s_version; /* version of the data format in fs. */
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/* defined below. */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 32)]
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public byte[] s_fsmnt; /* name of this file system */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
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public byte[] s_fpack; /* name of this physical volume */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = OLDNICINOD)]
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public ino_t[] s_inode; /* free i-node list */
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[MarshalAs(UnmanagedType.ByValArray, SizeConst = OLDNICFREE)]
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public daddr_t[] su_free; /* free block list for non-replicated filsys */
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public byte s_byteorder; /* byte order of integers */
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}
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[SuppressMessage("ReSharper", "InconsistentNaming")]
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[SuppressMessage("ReSharper", "BuiltInTypeReferenceStyle")]
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[Flags]
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enum LocusFlags : ushort
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{
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SB_RDONLY = 0x1, /* no writes on filesystem */
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SB_CLEAN = 0x2, /* fs unmounted cleanly (or checks run) */
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SB_DIRTY = 0x4, /* fs mounted without CLEAN bit set */
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SB_RMV = 0x8, /* fs is a removable file system */
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SB_PRIMPACK = 0x10, /* This is the primary pack of the filesystem */
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SB_REPLTYPE = 0x20, /* This is a replicated type filesystem. */
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SB_USER = 0x40, /* This is a "user" replicated filesystem. */
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SB_BACKBONE = 0x80, /* backbone pack ; complete copy of primary pack but not modifiable */
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SB_NFS = 0x100, /* This is a NFS type filesystem */
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SB_BYHAND = 0x200, /* Inhibits automatic fscks on a mangled file system */
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SB_NOSUID = 0x400, /* Set-uid/Set-gid is disabled */
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SB_SYNCW = 0x800 /* Synchronous Write */
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}
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[SuppressMessage("ReSharper", "InconsistentNaming")]
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[SuppressMessage("ReSharper", "BuiltInTypeReferenceStyle")]
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[Flags]
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enum LocusVersion : byte
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{
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SB_SB4096 = 1, /* smallblock filesys with 4096 byte blocks */
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SB_B1024 = 2, /* 1024 byte block filesystem */
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NUMSCANDEV = 5 /* Used by scangfs(), refed in space.h */
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}
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}
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} |