122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/*
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File: btrfs.c
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Copyright (C) 2011 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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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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#include <stdlib.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 "types.h"
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#include "common.h"
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#include "btrfs.h"
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#include "fnctdsk.h"
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#include "log.h"
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#include "guid_cpy.h"
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static int test_btrfs(const struct btrfs_super_block *sb);
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static void set_btrfs_info(const struct btrfs_super_block *sb, partition_t *partition)
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{
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partition->upart_type=UP_BTRFS;
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partition->blocksize=le32(sb->dev_item.sector_size);
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set_part_name(partition, sb->label, sizeof(sb->label));
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snprintf(partition->info, sizeof(partition->info), "btrfs blocksize=%u", partition->blocksize);
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if(le64(sb->bytenr)!=partition->part_offset + BTRFS_SUPER_INFO_OFFSET)
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{
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strcat(partition->info," Backup superblock");
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}
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/* last mounted => date */
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}
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int check_btrfs(disk_t *disk_car,partition_t *partition)
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{
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unsigned char *buffer=(unsigned char*)MALLOC(BTRFS_SUPER_INFO_SIZE);
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if(disk_car->pread(disk_car, buffer, BTRFS_SUPER_INFO_SIZE, partition->part_offset + BTRFS_SUPER_INFO_OFFSET) != BTRFS_SUPER_INFO_SIZE)
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{
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free(buffer);
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return 1;
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}
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if(test_btrfs((struct btrfs_super_block*)buffer)!=0)
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{
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free(buffer);
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return 1;
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}
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set_btrfs_info((struct btrfs_super_block*)buffer, partition);
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free(buffer);
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return 0;
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}
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/*
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Primary superblock is at 1024 (SUPERBLOCK_OFFSET)
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Group 0 begin at s_first_data_block
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*/
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int recover_btrfs(disk_t *disk, const struct btrfs_super_block *sb, partition_t *partition, const int verbose, const int dump_ind)
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{
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if(test_btrfs(sb)!=0)
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return 1;
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if(dump_ind!=0)
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{
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if(partition!=NULL && disk!=NULL)
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log_info("\nbtrfs magic value at %u/%u/%u\n",
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offset2cylinder(disk,partition->part_offset),
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offset2head(disk,partition->part_offset),
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offset2sector(disk,partition->part_offset));
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dump_log(sb, BTRFS_SUPER_INFO_SIZE);
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}
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if(partition==NULL)
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return 0;
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set_btrfs_info(sb, partition);
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partition->part_type_i386=P_LINUX;
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partition->part_type_mac=PMAC_LINUX;
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partition->part_type_sun=PSUN_LINUX;
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partition->part_type_gpt=GPT_ENT_TYPE_LINUX_DATA;
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partition->part_size=(uint64_t)le64(sb->dev_item.total_bytes);
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guid_cpy(&partition->part_uuid, (const efi_guid_t *)&sb->fsid);
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if(verbose>0)
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{
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log_info("\n");
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}
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partition->sborg_offset=BTRFS_SUPER_INFO_OFFSET;
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partition->sb_size=BTRFS_SUPER_INFO_SIZE;
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if(verbose>0)
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{
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if(disk==NULL)
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log_info("recover_btrfs: part_size %lu\n", (long unsigned)(partition->part_size / le32(sb->dev_item.sector_size)));
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else
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log_info("recover_btrfs: part_size %lu\n", (long unsigned)(partition->part_size / disk->sector_size));
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}
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return 0;
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}
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static int test_btrfs(const struct btrfs_super_block *sb)
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{
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if(memcmp(&sb->magic, BTRFS_MAGIC, 8)!=0)
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return 1;
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if(le32(sb->dev_item.sector_size)==0)
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return 1;
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return 0;
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}
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