172 lines
6.6 KiB
C
172 lines
6.6 KiB
C
/*
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File: file_xfs.c
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Copyright (C) 2015 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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#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_xfs)
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#endif
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#include <stdio.h>
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#include "types.h"
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#include "common.h"
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#include "xfs_struct.h"
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#include "filegen.h"
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/*@ requires valid_register_header_check(file_stat); */
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static void register_header_check_xfs(file_stat_t *file_stat);
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const file_hint_t file_hint_xfs = {
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.extension = "xfs",
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.description = "xfs structure",
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.max_filesize = 0,
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.recover = 1,
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.enable_by_default = 1,
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.register_header_check = ®ister_header_check_xfs
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};
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/*@
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@ requires buffer_size >= sizeof(struct xfs_sb);
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@ requires separation: \separated(&file_hint_xfs, buffer+(..), file_recovery, file_recovery_new);
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@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
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@ ensures valid_header_check_result(\result, file_recovery_new);
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@ assigns *file_recovery_new;
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@*/
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static int header_check_xfs_sb(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
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{
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const struct xfs_sb *sb = (const struct xfs_sb *)buffer;
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const unsigned int sb_blocksize = be32(sb->sb_blocksize);
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if(sb->sb_sectlog >= 16 || sb->sb_inodelog >= 16 || sb->sb_blocklog >= 16)
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return 0;
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if(sb->sb_magicnum != be32(XFS_SB_MAGIC) || be16(sb->sb_sectsize) != (1U << sb->sb_sectlog) || sb_blocksize != (1U << sb->sb_blocklog) || be16(sb->sb_inodesize) != (1U << sb->sb_inodelog))
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return 0;
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension = file_hint_xfs.extension;
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file_recovery_new->calculated_file_size = sb_blocksize;
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file_recovery_new->data_check = &data_check_size;
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file_recovery_new->file_check = &file_check_size;
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return 1;
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}
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/*@
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@ requires valid_data_check_param(buffer, buffer_size, file_recovery);
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@ ensures valid_data_check_result(\result, file_recovery);
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@ assigns \nothing;
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@*/
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static data_check_t data_check_stopasap(const unsigned char *buffer, const unsigned int buffer_size, file_recovery_t *file_recovery)
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{
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return DC_STOP;
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}
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/*@
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@ requires separation: \separated(&file_hint_xfs, buffer+(..), file_recovery, file_recovery_new);
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@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
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@ ensures valid_header_check_result(\result, file_recovery_new);
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@ assigns *file_recovery_new;
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@*/
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static int header_save_xfs(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
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{
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if(safe_header_only > 0)
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return 0;
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension = file_hint_xfs.extension;
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file_recovery_new->data_check = &data_check_stopasap;
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file_recovery_new->min_filesize = 512;
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return 1;
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}
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typedef struct xfs_timestamp
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{
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int32_t t_sec;
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int32_t t_nsec;
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} xfs_timestamp_t;
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typedef int64_t xfs_fsize_t; /* bytes in a file */
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typedef int32_t xfs_extnum_t; /* # of extents in a file */
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typedef int16_t xfs_aextnum_t; /* # extents in an attribute fork */
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typedef struct xfs_dinode_core
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{
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uint16_t di_magic;
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uint16_t di_mode;
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int8_t di_version;
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int8_t di_format;
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uint16_t di_onlink;
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uint32_t di_uid;
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uint32_t di_gid;
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uint32_t di_nlink;
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uint16_t di_projid;
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uint8_t di_pad[8];
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uint16_t di_flushiter;
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xfs_timestamp_t di_atime;
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xfs_timestamp_t di_mtime;
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xfs_timestamp_t di_ctime;
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xfs_fsize_t di_size;
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xfs_drfsbno_t di_nblocks;
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xfs_extlen_t di_extsize;
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xfs_extnum_t di_nextents;
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xfs_aextnum_t di_anextents;
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uint8_t di_forkoff;
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int8_t di_aformat;
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uint32_t di_dmevmask;
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uint16_t di_dmstate;
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uint16_t di_flags;
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uint32_t di_gen;
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} xfs_dinode_core_t;
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/*@
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@ requires buffer_size >= sizeof(xfs_dinode_core_t);
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@ requires separation: \separated(&file_hint_xfs, buffer+(..), file_recovery, file_recovery_new);
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@ requires valid_header_check_param(buffer, buffer_size, safe_header_only, file_recovery, file_recovery_new);
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@ ensures valid_header_check_result(\result, file_recovery_new);
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@ assigns *file_recovery_new;
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@*/
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static int header_check_xfs_inode(const unsigned char *buffer, const unsigned int buffer_size, const unsigned int safe_header_only, const file_recovery_t *file_recovery, file_recovery_t *file_recovery_new)
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{
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const xfs_dinode_core_t *inode = (const xfs_dinode_core_t *)buffer;
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if(safe_header_only > 0)
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return 0;
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if(inode->di_version != 2 || inode->di_pad[0] != 0 || inode->di_pad[1] != 0 || inode->di_pad[2] != 0 || inode->di_pad[3] != 0 || inode->di_pad[4] != 0 || inode->di_pad[5] != 0 || inode->di_pad[6] != 0 || inode->di_pad[7] != 0)
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return 0;
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reset_file_recovery(file_recovery_new);
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file_recovery_new->extension = file_hint_xfs.extension;
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file_recovery_new->data_check = &data_check_stopasap;
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return 1;
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}
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static void register_header_check_xfs(file_stat_t *file_stat)
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{
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static const unsigned char xagf[8] = { 'X', 'A', 'G', 'F', 0, 0, 0, 1 };
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static const unsigned char xagi[8] = { 'X', 'A', 'G', 'I', 0, 0, 0, 1 };
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static const unsigned char abtb[8] = { 'A', 'B', 'T', 'B', 0, 0, 0, 1 };
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static const unsigned char abtc[8] = { 'A', 'B', 'T', 'C', 0, 0, 0, 1 };
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static const unsigned char iabt[8] = { 'I', 'A', 'B', 'T', 0, 0, 0, 1 };
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register_header_check(0, "XFSB", 4, &header_check_xfs_sb, file_stat);
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register_header_check(0, xagf, 8, &header_save_xfs, file_stat);
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register_header_check(0, xagi, 8, &header_save_xfs, file_stat);
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register_header_check(0, abtb, 8, &header_save_xfs, file_stat);
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register_header_check(0, abtc, 8, &header_save_xfs, file_stat);
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register_header_check(0, iabt, 8, &header_save_xfs, file_stat);
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register_header_check(0, "IN", 2, &header_check_xfs_inode, file_stat);
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}
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#endif
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