202 lines
9.3 KiB
C
202 lines
9.3 KiB
C
/*
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File: sysv.c
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Copyright (C) 2004-2007 Christophe GRENIER <grenier@cgsecurity.org>
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This software 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 published by
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the Free Software Foundation; either version 2 of the License, or
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(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 along
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with this program; if not, write the Free Software Foundation, Inc., 51
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Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#define SYSV4_SUPERBLOCK_SIZE 512
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#define __packed2__ __attribute__ ((packed, aligned(2)))
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/* inode numbers are 16 bit */
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typedef uint16_t sysv_ino_t;
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/* Block numbers are 24 bit, sometimes stored in 32 bit.
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On Coherent FS, they are always stored in PDP-11 manner: the least
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significant 16 bits come last.
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*/
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typedef uint32_t sysv_zone_t;
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/* Among the blocks ... */
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/* Xenix FS, Coherent FS: block 0 is the boot block, block 1 the super-block.
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SystemV FS: block 0 contains both the boot sector and the super-block. */
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/* The first inode zone is sb->sv_firstinodezone (1 or 2). */
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/* Among the inodes ... */
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/* 0 is non-existent */
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#define SYSV_BADBL_INO 1 /* inode of bad blocks file */
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#define SYSV_ROOT_INO 2 /* inode of root directory */
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/* Xenix super-block data on disk */
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#define XENIX_NICINOD 100 /* number of inode cache entries */
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#define XENIX_NICFREE 100 /* number of free block list chunk entries */
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struct xenix_super_block {
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uint16_t s_isize; /* index of first data zone */
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uint32_t s_fsize __packed2__; /* total number of zones of this fs */
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/* the start of the free block list: */
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uint16_t s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */
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uint32_t s_free[XENIX_NICFREE]; /* first free block list chunk */
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/* the cache of free inodes: */
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uint16_t s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */
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sysv_ino_t s_inode[XENIX_NICINOD]; /* some free inodes */
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/* locks, not used by Linux: */
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char s_flock; /* lock during free block list manipulation */
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char s_ilock; /* lock during inode cache manipulation */
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char s_fmod; /* super-block modified flag */
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char s_ronly; /* flag whether fs is mounted read-only */
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uint32_t s_time __packed2__; /* time of last super block update */
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uint32_t s_tfree __packed2__; /* total number of free zones */
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uint16_t s_tinode; /* total number of free inodes */
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int16_t s_dinfo[4]; /* device information ?? */
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char s_fname[6]; /* file system volume name */
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char s_fpack[6]; /* file system pack name */
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char s_clean; /* set to 0x46 when filesystem is properly unmounted */
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char s_fill[371];
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int32_t s_magic; /* version of file system */
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int32_t s_type; /* type of file system: 1 for 512 byte blocks
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2 for 1024 byte blocks
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3 for 2048 byte blocks */
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};
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/* SystemV FS comes in two variants:
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* sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2).
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* sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4).
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*/
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#define SYSV_NICINOD 100 /* number of inode cache entries */
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#define SYSV_NICFREE 50 /* number of free block list chunk entries */
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/* SystemV4 super-block data on disk */
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struct sysv4_super_block {
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uint16_t s_isize; /* 0x00 index of first data zone */
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uint16_t s_pad0; /* 0x02 */
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uint32_t s_fsize; /* 0x04 total number of zones of this fs */
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/* the start of the free block list: */
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uint16_t s_nfree; /* 0x08 number of free blocks in s_free, <= SYSV_NICFREE */
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uint16_t s_pad1; /* 0x0a */
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uint32_t s_free[SYSV_NICFREE]; /* 0x0c first free block list chunk */
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/* the cache of free inodes: */
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uint16_t s_ninode; /* 0xd4 number of free inodes in s_inode, <= SYSV_NICINOD */
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uint16_t s_pad2; /* 0xd6 */
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sysv_ino_t s_inode[SYSV_NICINOD]; /* 0xd8 some free inodes */
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char s_flock; /* 0x1a0 lock during free block list manipulation */
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char s_ilock; /* 0x1a1 lock during inode cache manipulation */
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char s_fmod; /* 0x1a2 super-block modified flag */
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char s_ronly; /* 0x1a3 flag whether fs is mounted read-only */
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uint32_t s_time; /* 0x1a4 time of last super block update */
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int16_t s_dinfo[4]; /* 0x1a8 device information ?? */
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uint32_t s_tfree; /* 0x1b0 total number of free zones */
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uint16_t s_tinode; /* 0x1b4 total number of free inodes */
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char s_fname[6]; /* 0x1b6 file system volume name */
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char s_fpack[6]; /* 0x1bc file system pack name */
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uint16_t s_pad3; /* 0x1c2 */
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int32_t s_fill[12]; /* 0x1c4 */
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int32_t s_state; /* 0x1f4 file system state: 0x7c269d38-s_time means clean */
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int32_t s_magic; /* 0x1f8 version of file system */
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int32_t s_type; /* 0x1fc type of file system: 1 for 512 byte blocks
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2 for 1024 byte blocks */
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} __attribute__ ((__packed__));
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/* SystemV2 super-block data on disk */
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struct sysv2_super_block {
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uint16_t s_isize; /* 0x00 index of first data zone */
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uint32_t s_fsize __packed2__; /* 0x02 total number of zones of this fs */
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/* the start of the free block list: */
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uint16_t s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */
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uint32_t s_free[SYSV_NICFREE]; /* first free block list chunk */
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/* the cache of free inodes: */
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uint16_t s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */
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sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */
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/* locks, not used by Linux: */
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char s_flock; /* lock during free block list manipulation */
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char s_ilock; /* lock during inode cache manipulation */
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char s_fmod; /* super-block modified flag */
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char s_ronly; /* flag whether fs is mounted read-only */
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uint32_t s_time __packed2__; /* time of last super block update */
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int16_t s_dinfo[4]; /* device information ?? */
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uint32_t s_tfree __packed2__; /* total number of free zones */
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uint16_t s_tinode; /* total number of free inodes */
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char s_fname[6]; /* file system volume name */
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char s_fpack[6]; /* file system pack name */
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int32_t s_fill[14];
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int32_t s_state; /* file system state: 0xcb096f43 means clean */
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int32_t s_magic; /* version of file system */
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int32_t s_type; /* type of file system: 1 for 512 byte blocks
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2 for 1024 byte blocks */
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};
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/* V7 super-block data on disk */
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#define V7_NICINOD 100 /* number of inode cache entries */
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#define V7_NICFREE 50 /* number of free block list chunk entries */
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struct v7_super_block {
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uint16_t s_isize; /* index of first data zone */
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uint32_t s_fsize __packed2__; /* total number of zones of this fs */
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/* the start of the free block list: */
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uint16_t s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */
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uint32_t s_free[V7_NICFREE]; /* first free block list chunk */
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/* the cache of free inodes: */
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uint16_t s_ninode; /* number of free inodes in s_inode, <= V7_NICINOD */
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sysv_ino_t s_inode[V7_NICINOD]; /* some free inodes */
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/* locks, not used by Linux or V7: */
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char s_flock; /* lock during free block list manipulation */
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char s_ilock; /* lock during inode cache manipulation */
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char s_fmod; /* super-block modified flag */
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char s_ronly; /* flag whether fs is mounted read-only */
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uint32_t s_time __packed2__; /* time of last super block update */
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/* the following fields are not maintained by V7: */
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uint32_t s_tfree __packed2__; /* total number of free zones */
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uint16_t s_tinode; /* total number of free inodes */
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uint16_t s_m; /* interleave factor */
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uint16_t s_n; /* interleave factor */
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char s_fname[6]; /* file system name */
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char s_fpack[6]; /* file system pack name */
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};
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/* Coherent super-block data on disk */
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#define COH_NICINOD 100 /* number of inode cache entries */
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#define COH_NICFREE 64 /* number of free block list chunk entries */
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struct coh_super_block {
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uint16_t s_isize; /* index of first data zone */
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uint32_t s_fsize __packed2__; /* total number of zones of this fs */
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/* the start of the free block list: */
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uint16_t s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */
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uint32_t s_free[COH_NICFREE] __packed2__; /* first free block list chunk */
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/* the cache of free inodes: */
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uint16_t s_ninode; /* number of free inodes in s_inode, <= COH_NICINOD */
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sysv_ino_t s_inode[COH_NICINOD]; /* some free inodes */
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/* locks, not used by Linux: */
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char s_flock; /* lock during free block list manipulation */
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char s_ilock; /* lock during inode cache manipulation */
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char s_fmod; /* super-block modified flag */
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char s_ronly; /* flag whether fs is mounted read-only */
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uint32_t s_time __packed2__; /* time of last super block update */
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uint32_t s_tfree __packed2__; /* total number of free zones */
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uint16_t s_tinode; /* total number of free inodes */
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uint16_t s_interleave_m; /* interleave factor */
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uint16_t s_interleave_n;
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char s_fname[6]; /* file system volume name */
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char s_fpack[6]; /* file system pack name */
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uint32_t s_unique; /* zero, not used */
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};
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int check_sysv(disk_t *disk_car,partition_t *partition,const int verbose);
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int recover_sysv(disk_t *disk_car, const struct sysv4_super_block *sbd, partition_t *partition,const int verbose, const int dump_ind);
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