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Aaru/DiscImageChef.Filesystems/Locus.cs

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