mirror of
https://github.com/aaru-dps/Aaru.git
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353 lines
17 KiB
C#
353 lines
17 KiB
C#
/***************************************************************************
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FileSystem identifier and checker
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----------------------------------------------------------------------------
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Filename : ODS.cs
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Version : 1.0
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Author(s) : Natalia Portillo
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Component : Filesystem plugins
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Revision : $Revision$
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Last change by : $Author$
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Date : $Date$
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--[ Description ] ----------------------------------------------------------
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Identifies VMS filesystems and shows information.
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--[ License ] --------------------------------------------------------------
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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----------------------------------------------------------------------------
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Copyright (C) 2011-2014 Claunia.com
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****************************************************************************/
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//$Id$
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using System;
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using System.Text;
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using FileSystemIDandChk;
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// Information from VMS File System Internals by Kirby McCoy
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// ISBN: 1-55558-056-4
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// With some hints from http://www.decuslib.com/DECUS/vmslt97b/gnusoftware/gccaxp/7_1/vms/hm2def.h
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// Expects the home block to be always in sector #1 (does not check deltas)
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// Assumes a sector size of 512 bytes (VMS does on HDDs and optical drives, dunno about M.O.)
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// Book only describes ODS-2. Need to test ODS-1 and ODS-5
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// There is an ODS with signature "DECFILES11A", yet to be seen
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// Time is a 64 bit unsigned integer, tenths of microseconds since 1858/11/17 00:00:00.
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// TODO: Implement checksum
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namespace FileSystemIDandChk.Plugins
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{
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class ODS : Plugin
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{
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public ODS(PluginBase Core)
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{
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Name = "Files-11 On-Disk Structure";
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PluginUUID = new Guid("de20633c-8021-4384-aeb0-83b0df14491f");
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}
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public override bool Identify(ImagePlugins.ImagePlugin imagePlugin, ulong partitionOffset)
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{
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byte[] magic_b = new byte[12];
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string magic;
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byte[] hb_sector = imagePlugin.ReadSector(1 + partitionOffset);
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Array.Copy(hb_sector, 0x1F0, magic_b, 0, 12);
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magic = Encoding.ASCII.GetString(magic_b);
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return magic == "DECFILE11A " || magic == "DECFILE11B ";
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}
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public override void GetInformation(ImagePlugins.ImagePlugin imagePlugin, ulong partitionOffset, out string information)
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{
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information = "";
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StringBuilder sb = new StringBuilder();
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ODSHomeBlock homeblock = new ODSHomeBlock();
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byte[] temp_string = new byte[12];
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homeblock.min_class = new byte[20];
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homeblock.max_class = new byte[20];
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byte[] hb_sector = imagePlugin.ReadSector(1 + partitionOffset);
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homeblock.homelbn = BitConverter.ToUInt32(hb_sector, 0x000);
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homeblock.alhomelbn = BitConverter.ToUInt32(hb_sector, 0x004);
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homeblock.altidxlbn = BitConverter.ToUInt32(hb_sector, 0x008);
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homeblock.struclev = BitConverter.ToUInt16(hb_sector, 0x00C);
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homeblock.cluster = BitConverter.ToUInt16(hb_sector, 0x00E);
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homeblock.homevbn = BitConverter.ToUInt16(hb_sector, 0x010);
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homeblock.alhomevbn = BitConverter.ToUInt16(hb_sector, 0x012);
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homeblock.altidxvbn = BitConverter.ToUInt16(hb_sector, 0x014);
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homeblock.ibmapvbn = BitConverter.ToUInt16(hb_sector, 0x016);
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homeblock.ibmaplbn = BitConverter.ToUInt32(hb_sector, 0x018);
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homeblock.maxfiles = BitConverter.ToUInt32(hb_sector, 0x01C);
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homeblock.ibmapsize = BitConverter.ToUInt16(hb_sector, 0x020);
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homeblock.resfiles = BitConverter.ToUInt16(hb_sector, 0x022);
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homeblock.devtype = BitConverter.ToUInt16(hb_sector, 0x024);
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homeblock.rvn = BitConverter.ToUInt16(hb_sector, 0x026);
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homeblock.setcount = BitConverter.ToUInt16(hb_sector, 0x028);
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homeblock.volchar = BitConverter.ToUInt16(hb_sector, 0x02A);
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homeblock.volowner = BitConverter.ToUInt32(hb_sector, 0x02C);
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homeblock.sec_mask = BitConverter.ToUInt32(hb_sector, 0x030);
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homeblock.protect = BitConverter.ToUInt16(hb_sector, 0x034);
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homeblock.fileprot = BitConverter.ToUInt16(hb_sector, 0x036);
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homeblock.recprot = BitConverter.ToUInt16(hb_sector, 0x038);
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homeblock.checksum1 = BitConverter.ToUInt16(hb_sector, 0x03A);
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homeblock.credate = BitConverter.ToUInt64(hb_sector, 0x03C);
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homeblock.window = hb_sector[0x044];
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homeblock.lru_lim = hb_sector[0x045];
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homeblock.extend = BitConverter.ToUInt16(hb_sector, 0x046);
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homeblock.retainmin = BitConverter.ToUInt64(hb_sector, 0x048);
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homeblock.retainmax = BitConverter.ToUInt64(hb_sector, 0x050);
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homeblock.revdate = BitConverter.ToUInt64(hb_sector, 0x058);
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Array.Copy(hb_sector, 0x060, homeblock.min_class, 0, 20);
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Array.Copy(hb_sector, 0x074, homeblock.max_class, 0, 20);
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homeblock.filetab_fid1 = BitConverter.ToUInt16(hb_sector, 0x088);
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homeblock.filetab_fid2 = BitConverter.ToUInt16(hb_sector, 0x08A);
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homeblock.filetab_fid3 = BitConverter.ToUInt16(hb_sector, 0x08C);
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homeblock.lowstruclev = BitConverter.ToUInt16(hb_sector, 0x08E);
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homeblock.highstruclev = BitConverter.ToUInt16(hb_sector, 0x090);
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homeblock.copydate = BitConverter.ToUInt64(hb_sector, 0x092);
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homeblock.serialnum = BitConverter.ToUInt32(hb_sector, 0x1C8);
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Array.Copy(hb_sector, 0x1CC, temp_string, 0, 12);
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homeblock.strucname = StringHandlers.CToString(temp_string);
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Array.Copy(hb_sector, 0x1D8, temp_string, 0, 12);
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homeblock.volname = StringHandlers.CToString(temp_string);
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Array.Copy(hb_sector, 0x1E4, temp_string, 0, 12);
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homeblock.ownername = StringHandlers.CToString(temp_string);
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Array.Copy(hb_sector, 0x1F0, temp_string, 0, 12);
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homeblock.format = StringHandlers.CToString(temp_string);
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homeblock.checksum2 = BitConverter.ToUInt16(hb_sector, 0x1FE);
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if ((homeblock.struclev & 0xFF00) != 0x0200 || (homeblock.struclev & 0xFF) != 1 || homeblock.format != "DECFILE11B ")
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sb.AppendLine("The following information may be incorrect for this volume.");
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if (homeblock.resfiles < 5 || homeblock.devtype != 0)
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sb.AppendLine("This volume may be corrupted.");
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sb.AppendFormat("Volume format is {0}", homeblock.format).AppendLine();
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sb.AppendFormat("Volume is Level {0} revision {1}", (homeblock.struclev & 0xFF00) >> 8, homeblock.struclev & 0xFF).AppendLine();
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sb.AppendFormat("Lowest structure in the volume is Level {0}, revision {1}", (homeblock.lowstruclev & 0xFF00) >> 8, homeblock.lowstruclev & 0xFF).AppendLine();
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sb.AppendFormat("Highest structure in the volume is Level {0}, revision {1}", (homeblock.highstruclev & 0xFF00) >> 8, homeblock.highstruclev & 0xFF).AppendLine();
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sb.AppendFormat("{0} sectors per cluster ({1} bytes)", homeblock.cluster, homeblock.cluster * 512).AppendLine();
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sb.AppendFormat("This home block is on sector {0} (cluster {1})", homeblock.homelbn, homeblock.homevbn).AppendLine();
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sb.AppendFormat("Secondary home block is on sector {0} (cluster {1})", homeblock.alhomelbn, homeblock.alhomevbn).AppendLine();
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sb.AppendFormat("Volume bitmap starts in sector {0} (cluster {1})", homeblock.ibmaplbn, homeblock.ibmapvbn).AppendLine();
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sb.AppendFormat("Volume bitmap runs for {0} sectors ({1} bytes)", homeblock.ibmapsize, homeblock.ibmapsize * 512).AppendLine();
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sb.AppendFormat("Backup INDEXF.SYS;1 is in sector {0} (cluster {1})", homeblock.altidxlbn, homeblock.altidxvbn).AppendLine();
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sb.AppendFormat("{0} maximum files on the volume", homeblock.maxfiles).AppendLine();
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sb.AppendFormat("{0} reserved files", homeblock.resfiles).AppendLine();
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if (homeblock.rvn > 0 && homeblock.setcount > 0 && homeblock.strucname != " ")
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sb.AppendFormat("Volume is {0} of {1} in set \"{2}\".", homeblock.rvn, homeblock.setcount, homeblock.strucname).AppendLine();
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sb.AppendFormat("Volume owner is \"{0}\" (ID 0x{1:X8})", homeblock.ownername, homeblock.volowner).AppendLine();
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sb.AppendFormat("Volume label: \"{0}\"", homeblock.volname).AppendLine();
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sb.AppendFormat("Drive serial number: 0x{0:X8}", homeblock.serialnum).AppendLine();
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sb.AppendFormat("Volume was created on {0}", DateHandlers.VMSToDateTime(homeblock.credate)).AppendLine();
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if (homeblock.revdate > 0)
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sb.AppendFormat("Volume was last modified on {0}", DateHandlers.VMSToDateTime(homeblock.revdate)).AppendLine();
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if (homeblock.copydate > 0)
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sb.AppendFormat("Volume copied on {0}", DateHandlers.VMSToDateTime(homeblock.copydate)).AppendLine();
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sb.AppendFormat("Checksums: 0x{0:X4} and 0x{1:X4}", homeblock.checksum1, homeblock.checksum2).AppendLine();
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sb.AppendLine("Flags:");
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sb.AppendFormat("Window: {0}", homeblock.window).AppendLine();
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sb.AppendFormat("Cached directores: {0}", homeblock.lru_lim).AppendLine();
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sb.AppendFormat("Default allocation: {0} blocks", homeblock.extend).AppendLine();
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if ((homeblock.volchar & 0x01) == 0x01)
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sb.AppendLine("Readings should be verified");
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if ((homeblock.volchar & 0x02) == 0x02)
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sb.AppendLine("Writings should be verified");
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if ((homeblock.volchar & 0x04) == 0x04)
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sb.AppendLine("Files should be erased or overwritten when deleted");
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if ((homeblock.volchar & 0x08) == 0x08)
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sb.AppendLine("Highwater mark is to be disabled");
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if ((homeblock.volchar & 0x10) == 0x10)
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sb.AppendLine("Classification checks are enabled");
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sb.AppendLine("Volume permissions (r = read, w = write, c = create, d = delete)");
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sb.AppendLine("System, owner, group, world");
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// System
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if ((homeblock.protect & 0x1000) == 0x1000)
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sb.Append("-");
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else
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sb.Append("r");
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if ((homeblock.protect & 0x2000) == 0x2000)
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sb.Append("-");
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else
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sb.Append("w");
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if ((homeblock.protect & 0x4000) == 0x4000)
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sb.Append("-");
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else
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sb.Append("c");
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if ((homeblock.protect & 0x8000) == 0x8000)
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sb.Append("-");
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else
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sb.Append("d");
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// Owner
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if ((homeblock.protect & 0x100) == 0x100)
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sb.Append("-");
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else
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sb.Append("r");
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if ((homeblock.protect & 0x200) == 0x200)
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sb.Append("-");
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else
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sb.Append("w");
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if ((homeblock.protect & 0x400) == 0x400)
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sb.Append("-");
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else
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sb.Append("c");
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if ((homeblock.protect & 0x800) == 0x800)
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sb.Append("-");
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else
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sb.Append("d");
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// Group
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if ((homeblock.protect & 0x10) == 0x10)
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sb.Append("-");
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else
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sb.Append("r");
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if ((homeblock.protect & 0x20) == 0x20)
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sb.Append("-");
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else
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sb.Append("w");
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if ((homeblock.protect & 0x40) == 0x40)
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sb.Append("-");
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else
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sb.Append("c");
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if ((homeblock.protect & 0x80) == 0x80)
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sb.Append("-");
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else
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sb.Append("d");
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// World (other)
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if ((homeblock.protect & 0x1) == 0x1)
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sb.Append("-");
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else
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sb.Append("r");
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if ((homeblock.protect & 0x2) == 0x2)
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sb.Append("-");
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else
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sb.Append("w");
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if ((homeblock.protect & 0x4) == 0x4)
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sb.Append("-");
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else
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sb.Append("c");
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if ((homeblock.protect & 0x8) == 0x8)
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sb.Append("-");
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else
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sb.Append("d");
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sb.AppendLine();
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sb.AppendLine("Unknown structures:");
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sb.AppendFormat("Security mask: 0x{0:X8}", homeblock.sec_mask).AppendLine();
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sb.AppendFormat("File protection: 0x{0:X4}", homeblock.fileprot).AppendLine();
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sb.AppendFormat("Record protection: 0x{0:X4}", homeblock.recprot).AppendLine();
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information = sb.ToString();
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}
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struct ODSHomeBlock
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{
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public UInt32 homelbn;
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// 0x000, LBN of THIS home block
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public UInt32 alhomelbn;
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// 0x004, LBN of the secondary home block
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public UInt32 altidxlbn;
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// 0x008, LBN of backup INDEXF.SYS;1
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public UInt16 struclev;
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// 0x00C, High byte contains filesystem version (1, 2 or 5), low byte contains revision (1)
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public UInt16 cluster;
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// 0x00E, Number of blocks each bit of the volume bitmap represents
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public UInt16 homevbn;
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// 0x010, VBN of THIS home block
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public UInt16 alhomevbn;
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// 0x012, VBN of the secondary home block
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public UInt16 altidxvbn;
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// 0x014, VBN of backup INDEXF.SYS;1
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public UInt16 ibmapvbn;
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// 0x016, VBN of the bitmap
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public UInt32 ibmaplbn;
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// 0x018, LBN of the bitmap
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public UInt32 maxfiles;
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// 0x01C, Max files on volume
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public UInt16 ibmapsize;
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// 0x020, Bitmap size in sectors
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public UInt16 resfiles;
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// 0x022, Reserved files, 5 at minimum
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public UInt16 devtype;
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// 0x024, Device type, ODS-2 defines it as always 0
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public UInt16 rvn;
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// 0x026, Relative volume number (number of the volume in a set)
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public UInt16 setcount;
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// 0x028, Total number of volumes in the set this volume is
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public UInt16 volchar;
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// 0x02A, Flags
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public UInt32 volowner;
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// 0x02C, User ID of the volume owner
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public UInt32 sec_mask;
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// 0x030, Security mask (??)
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public UInt16 protect;
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// 0x034, Volume permissions (system, owner, group and other)
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public UInt16 fileprot;
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// 0x036, Default file protection, unsupported in ODS-2
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public UInt16 recprot;
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// 0x038, Default file record protection
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public UInt16 checksum1;
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// 0x03A, Checksum of all preceding entries
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public UInt64 credate;
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// 0x03C, Creation date
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public byte window;
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// 0x044, Window size (pointers for the window)
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public byte lru_lim;
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// 0x045, Directories to be stored in cache
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public UInt16 extend;
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// 0x046, Default allocation size in blocks
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public UInt64 retainmin;
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// 0x048, Minimum file retention period
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public UInt64 retainmax;
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// 0x050, Maximum file retention period
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public UInt64 revdate;
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// 0x058, Last modification date
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public byte[] min_class;
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// 0x060, Minimum security class, 20 bytes
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public byte[] max_class;
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// 0x074, Maximum security class, 20 bytes
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public UInt16 filetab_fid1;
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// 0x088, File lookup table FID
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public UInt16 filetab_fid2;
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// 0x08A, File lookup table FID
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public UInt16 filetab_fid3;
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// 0x08C, File lookup table FID
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public UInt16 lowstruclev;
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// 0x08E, Lowest structure level on the volume
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public UInt16 highstruclev;
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// 0x090, Highest structure level on the volume
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public UInt64 copydate;
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// 0x092, Volume copy date (??)
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public byte[] reserved1;
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// 0x09A, 302 bytes
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public UInt32 serialnum;
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// 0x1C8, Physical drive serial number
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public string strucname;
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// 0x1CC, Name of the volume set, 12 bytes
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public string volname;
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// 0x1D8, Volume label, 12 bytes
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public string ownername;
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// 0x1E4, Name of the volume owner, 12 bytes
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public string format;
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// 0x1F0, ODS-2 defines it as "DECFILE11B", 12 bytes
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public UInt16 reserved2;
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// 0x1FC, Reserved
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public UInt16 checksum2;
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// 0x1FE, Checksum of preceding 255 words (16 bit units)
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}
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}
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} |