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authorChristophe Grenier <grenier@cgsecurity.org>2007-10-29 22:38:52 +0100
committerChristophe Grenier <grenier@cgsecurity.org>2007-10-29 22:38:52 +0100
commit9928d99936105b4653d2d1b8ca74dc3ffba5c71e (patch)
tree06aa4f5e9f0055027c6fb54dd47a8414cf2fba32 /src/sysv.h
First version in git
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+/*
+
+ File: sysv.c
+
+ Copyright (C) 2004-2007 Christophe GRENIER <grenier@cgsecurity.org>
+
+ This software is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program 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 General Public License for more details.
+
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write the Free Software Foundation, Inc., 51
+ Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+
+ */
+
+#define SYSV4_SUPERBLOCK_SIZE 512
+
+#define __packed2__ __attribute__ ((packed, aligned(2)))
+
+/* inode numbers are 16 bit */
+
+typedef uint16_t sysv_ino_t;
+
+/* Block numbers are 24 bit, sometimes stored in 32 bit.
+ On Coherent FS, they are always stored in PDP-11 manner: the least
+ significant 16 bits come last.
+*/
+
+typedef uint32_t sysv_zone_t;
+
+/* Among the blocks ... */
+/* Xenix FS, Coherent FS: block 0 is the boot block, block 1 the super-block.
+ SystemV FS: block 0 contains both the boot sector and the super-block. */
+/* The first inode zone is sb->sv_firstinodezone (1 or 2). */
+
+/* Among the inodes ... */
+/* 0 is non-existent */
+#define SYSV_BADBL_INO 1 /* inode of bad blocks file */
+#define SYSV_ROOT_INO 2 /* inode of root directory */
+
+
+/* Xenix super-block data on disk */
+#define XENIX_NICINOD 100 /* number of inode cache entries */
+#define XENIX_NICFREE 100 /* number of free block list chunk entries */
+struct xenix_super_block {
+ uint16_t s_isize; /* index of first data zone */
+ uint32_t s_fsize __packed2__; /* total number of zones of this fs */
+ /* the start of the free block list: */
+ uint16_t s_nfree; /* number of free blocks in s_free, <= XENIX_NICFREE */
+ uint32_t s_free[XENIX_NICFREE]; /* first free block list chunk */
+ /* the cache of free inodes: */
+ uint16_t s_ninode; /* number of free inodes in s_inode, <= XENIX_NICINOD */
+ sysv_ino_t s_inode[XENIX_NICINOD]; /* some free inodes */
+ /* locks, not used by Linux: */
+ char s_flock; /* lock during free block list manipulation */
+ char s_ilock; /* lock during inode cache manipulation */
+ char s_fmod; /* super-block modified flag */
+ char s_ronly; /* flag whether fs is mounted read-only */
+ uint32_t s_time __packed2__; /* time of last super block update */
+ uint32_t s_tfree __packed2__; /* total number of free zones */
+ uint16_t s_tinode; /* total number of free inodes */
+ int16_t s_dinfo[4]; /* device information ?? */
+ char s_fname[6]; /* file system volume name */
+ char s_fpack[6]; /* file system pack name */
+ char s_clean; /* set to 0x46 when filesystem is properly unmounted */
+ char s_fill[371];
+ int32_t s_magic; /* version of file system */
+ int32_t s_type; /* type of file system: 1 for 512 byte blocks
+ 2 for 1024 byte blocks
+ 3 for 2048 byte blocks */
+};
+
+/* SystemV FS comes in two variants:
+ * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2).
+ * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4).
+ */
+#define SYSV_NICINOD 100 /* number of inode cache entries */
+#define SYSV_NICFREE 50 /* number of free block list chunk entries */
+
+/* SystemV4 super-block data on disk */
+struct sysv4_super_block {
+ uint16_t s_isize; /* 0x00 index of first data zone */
+ uint16_t s_pad0; /* 0x02 */
+ uint32_t s_fsize; /* 0x04 total number of zones of this fs */
+ /* the start of the free block list: */
+ uint16_t s_nfree; /* 0x08 number of free blocks in s_free, <= SYSV_NICFREE */
+ uint16_t s_pad1; /* 0x0a */
+ uint32_t s_free[SYSV_NICFREE]; /* 0x0c first free block list chunk */
+ /* the cache of free inodes: */
+ uint16_t s_ninode; /* 0xd4 number of free inodes in s_inode, <= SYSV_NICINOD */
+ uint16_t s_pad2; /* 0xd6 */
+ sysv_ino_t s_inode[SYSV_NICINOD]; /* 0xd8 some free inodes */
+ char s_flock; /* 0x1a0 lock during free block list manipulation */
+ char s_ilock; /* 0x1a1 lock during inode cache manipulation */
+ char s_fmod; /* 0x1a2 super-block modified flag */
+ char s_ronly; /* 0x1a3 flag whether fs is mounted read-only */
+ uint32_t s_time; /* 0x1a4 time of last super block update */
+ int16_t s_dinfo[4]; /* 0x1a8 device information ?? */
+ uint32_t s_tfree; /* 0x1b0 total number of free zones */
+ uint16_t s_tinode; /* 0x1b4 total number of free inodes */
+ char s_fname[6]; /* 0x1b6 file system volume name */
+ char s_fpack[6]; /* 0x1bc file system pack name */
+ uint16_t s_pad3; /* 0x1c2 */
+ int32_t s_fill[12]; /* 0x1c4 */
+ int32_t s_state; /* 0x1f4 file system state: 0x7c269d38-s_time means clean */
+ int32_t s_magic; /* 0x1f8 version of file system */
+ int32_t s_type; /* 0x1fc type of file system: 1 for 512 byte blocks
+ 2 for 1024 byte blocks */
+} __attribute__ ((__packed__));
+
+/* SystemV2 super-block data on disk */
+struct sysv2_super_block {
+ uint16_t s_isize; /* 0x00 index of first data zone */
+ uint32_t s_fsize __packed2__; /* 0x02 total number of zones of this fs */
+ /* the start of the free block list: */
+ uint16_t s_nfree; /* number of free blocks in s_free, <= SYSV_NICFREE */
+ uint32_t s_free[SYSV_NICFREE]; /* first free block list chunk */
+ /* the cache of free inodes: */
+ uint16_t s_ninode; /* number of free inodes in s_inode, <= SYSV_NICINOD */
+ sysv_ino_t s_inode[SYSV_NICINOD]; /* some free inodes */
+ /* locks, not used by Linux: */
+ char s_flock; /* lock during free block list manipulation */
+ char s_ilock; /* lock during inode cache manipulation */
+ char s_fmod; /* super-block modified flag */
+ char s_ronly; /* flag whether fs is mounted read-only */
+ uint32_t s_time __packed2__; /* time of last super block update */
+ int16_t s_dinfo[4]; /* device information ?? */
+ uint32_t s_tfree __packed2__; /* total number of free zones */
+ uint16_t s_tinode; /* total number of free inodes */
+ char s_fname[6]; /* file system volume name */
+ char s_fpack[6]; /* file system pack name */
+ int32_t s_fill[14];
+ int32_t s_state; /* file system state: 0xcb096f43 means clean */
+ int32_t s_magic; /* version of file system */
+ int32_t s_type; /* type of file system: 1 for 512 byte blocks
+ 2 for 1024 byte blocks */
+};
+
+/* V7 super-block data on disk */
+#define V7_NICINOD 100 /* number of inode cache entries */
+#define V7_NICFREE 50 /* number of free block list chunk entries */
+struct v7_super_block {
+ uint16_t s_isize; /* index of first data zone */
+ uint32_t s_fsize __packed2__; /* total number of zones of this fs */
+ /* the start of the free block list: */
+ uint16_t s_nfree; /* number of free blocks in s_free, <= V7_NICFREE */
+ uint32_t s_free[V7_NICFREE]; /* first free block list chunk */
+ /* the cache of free inodes: */
+ uint16_t s_ninode; /* number of free inodes in s_inode, <= V7_NICINOD */
+ sysv_ino_t s_inode[V7_NICINOD]; /* some free inodes */
+ /* locks, not used by Linux or V7: */
+ char s_flock; /* lock during free block list manipulation */
+ char s_ilock; /* lock during inode cache manipulation */
+ char s_fmod; /* super-block modified flag */
+ char s_ronly; /* flag whether fs is mounted read-only */
+ uint32_t s_time __packed2__; /* time of last super block update */
+ /* the following fields are not maintained by V7: */
+ uint32_t s_tfree __packed2__; /* total number of free zones */
+ uint16_t s_tinode; /* total number of free inodes */
+ uint16_t s_m; /* interleave factor */
+ uint16_t s_n; /* interleave factor */
+ char s_fname[6]; /* file system name */
+ char s_fpack[6]; /* file system pack name */
+};
+
+/* Coherent super-block data on disk */
+#define COH_NICINOD 100 /* number of inode cache entries */
+#define COH_NICFREE 64 /* number of free block list chunk entries */
+struct coh_super_block {
+ uint16_t s_isize; /* index of first data zone */
+ uint32_t s_fsize __packed2__; /* total number of zones of this fs */
+ /* the start of the free block list: */
+ uint16_t s_nfree; /* number of free blocks in s_free, <= COH_NICFREE */
+ uint32_t s_free[COH_NICFREE] __packed2__; /* first free block list chunk */
+ /* the cache of free inodes: */
+ uint16_t s_ninode; /* number of free inodes in s_inode, <= COH_NICINOD */
+ sysv_ino_t s_inode[COH_NICINOD]; /* some free inodes */
+ /* locks, not used by Linux: */
+ char s_flock; /* lock during free block list manipulation */
+ char s_ilock; /* lock during inode cache manipulation */
+ char s_fmod; /* super-block modified flag */
+ char s_ronly; /* flag whether fs is mounted read-only */
+ uint32_t s_time __packed2__; /* time of last super block update */
+ uint32_t s_tfree __packed2__; /* total number of free zones */
+ uint16_t s_tinode; /* total number of free inodes */
+ uint16_t s_interleave_m; /* interleave factor */
+ uint16_t s_interleave_n;
+ char s_fname[6]; /* file system volume name */
+ char s_fpack[6]; /* file system pack name */
+ uint32_t s_unique; /* zero, not used */
+};
+
+int check_sysv(disk_t *disk_car,partition_t *partition,const int verbose);
+int recover_sysv(disk_t *disk_car, const struct sysv4_super_block *sbd, partition_t *partition,const int verbose, const int dump_ind);
+