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/*
File: ext2_sbn.c
Copyright (C) 1998-2009 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.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#ifdef HAVE_STDLIB_H
#include <stdlib.h>
#endif
#include "types.h"
#include "common.h"
#include "intrf.h"
#include "intrfn.h"
#include "fnctdsk.h"
#include "log.h"
#include "lang.h"
#include "ext2.h"
#include "ext2_sbn.h"
// blocksize=1024, 2048, 4096, 65536
// blocks per blocksgroup=8*blocksize
static const uint64_t group_size[4]={
(EXT2_MIN_BLOCK_SIZE<<0)*8*(EXT2_MIN_BLOCK_SIZE<<0),
(EXT2_MIN_BLOCK_SIZE<<1)*8*(EXT2_MIN_BLOCK_SIZE<<1),
(EXT2_MIN_BLOCK_SIZE<<2)*8*(EXT2_MIN_BLOCK_SIZE<<2),
(uint64_t)(EXT2_MIN_BLOCK_SIZE<<6)*8*(EXT2_MIN_BLOCK_SIZE<<6),
};
static const uint64_t factors[3]={3,5,7};
static uint64_t next_sb(const uint64_t hd_offset_old)
{
uint64_t hd_offset=0;
int j;
for(j=0; j<4; j++)
{
int i;
const uint64_t offset=(j==0?2*512:0);
for(i=0; i<3; i++)
{
uint64_t val;
for(val=1; val * group_size[j] + offset <= hd_offset_old; val*=factors[i])
;
if(hd_offset==0 || val * group_size[j] + offset < hd_offset)
hd_offset=val* group_size[j] + offset;
}
}
if(hd_offset_old < EXT2_MIN_BLOCK_SIZE<<0 && EXT2_MIN_BLOCK_SIZE<<0 < hd_offset)
hd_offset=EXT2_MIN_BLOCK_SIZE<<0;
else if(hd_offset_old < EXT2_MIN_BLOCK_SIZE<<1 && EXT2_MIN_BLOCK_SIZE<<1 < hd_offset)
hd_offset=EXT2_MIN_BLOCK_SIZE<<1;
else if(hd_offset_old < EXT2_MIN_BLOCK_SIZE<<2 && EXT2_MIN_BLOCK_SIZE<<2 < hd_offset)
hd_offset=EXT2_MIN_BLOCK_SIZE<<2;
else if(hd_offset_old < EXT2_MIN_BLOCK_SIZE<<6 && EXT2_MIN_BLOCK_SIZE<<6 < hd_offset)
hd_offset=EXT2_MIN_BLOCK_SIZE<<6;
return hd_offset;
}
list_part_t *search_superblock(disk_t *disk_car, partition_t *partition, const int verbose, const int dump_ind)
{
unsigned char *buffer=(unsigned char *)MALLOC(2*0x200);
uint64_t hd_offset;
int nbr_sb=0;
list_part_t *list_part=NULL;
int ind_stop=0;
#ifdef HAVE_NCURSES
unsigned long int old_percent=0;
#endif
struct ext2_super_block *sb=(struct ext2_super_block *)buffer;
partition_t *new_partition=partition_new(disk_car->arch);
log_trace("search_superblock\n");
#ifdef HAVE_NCURSES
aff_copy(stdscr);
wmove(stdscr,4,0);
wprintw(stdscr,"%s",disk_car->description(disk_car));
mvwaddstr(stdscr,5,0,msg_PART_HEADER_LONG);
wmove(stdscr,6,0);
aff_part(stdscr,AFF_PART_ORDER|AFF_PART_STATUS,disk_car,partition);
wmove(stdscr,22,0);
wattrset(stdscr, A_REVERSE);
waddstr(stdscr," Stop ");
wattroff(stdscr, A_REVERSE);
#endif
for(hd_offset=0;
hd_offset<partition->part_size && nbr_sb<10 && ind_stop==0;
hd_offset=next_sb(hd_offset))
{
#ifdef HAVE_NCURSES
const unsigned long int percent=hd_offset*100/partition->part_size;
if(percent!=old_percent)
{
wmove(stdscr,9,0);
wclrtoeol(stdscr);
wprintw(stdscr, "Search ext2/ext3/ext4 superblock %10lu/%lu %lu%%",
(long unsigned)(hd_offset/disk_car->sector_size),
(long unsigned)(partition->part_size/disk_car->sector_size),
percent);
wrefresh(stdscr);
ind_stop|=check_enter_key_or_s(stdscr);
old_percent=percent;
}
#endif
if(disk_car->pread(disk_car, buffer, 1024, partition->part_offset + hd_offset) == 1024)
{
/* ext2/ext3/ext4 */
if(le16(sb->s_magic)==EXT2_SUPER_MAGIC)
{
dup_partition_t(new_partition,partition);
new_partition->part_offset+=hd_offset;
if(recover_EXT2(disk_car,sb,new_partition,verbose,dump_ind)==0)
{
int insert_error=0;
if(hd_offset<=(EXT2_MIN_BLOCK_SIZE<<2))
new_partition->part_offset-=hd_offset;
if(partition->blocksize==0)
{
partition->sborg_offset=new_partition->sborg_offset;
partition->sb_offset =new_partition->sb_offset;
partition->sb_size =new_partition->sb_size;
partition->blocksize =new_partition->blocksize;
}
log_info("Ext2 superblock found at sector %llu (block=%llu, blocksize=%u)\n",
(long long unsigned) hd_offset/DEFAULT_SECTOR_SIZE,
(long long unsigned) hd_offset>>(EXT2_MIN_BLOCK_LOG_SIZE+le32(sb->s_log_block_size)),
(unsigned int)EXT2_MIN_BLOCK_SIZE<<le32(sb->s_log_block_size));
#ifdef HAVE_NCURSES
wmove(stdscr,10+nbr_sb,0);
wprintw(stdscr,"Ext2 superblock found at sector %llu (block=%llu, blocksize=%u) \n",
(long long unsigned) hd_offset/DEFAULT_SECTOR_SIZE,
(long long unsigned) hd_offset>>(EXT2_MIN_BLOCK_LOG_SIZE+le32(sb->s_log_block_size)),
EXT2_MIN_BLOCK_SIZE<<le32(sb->s_log_block_size));
#endif
list_part=insert_new_partition(list_part, new_partition, 1, &insert_error);
new_partition=partition_new(disk_car->arch);
nbr_sb++;
}
}
}
}
free(new_partition);
free(buffer);
return list_part;
}
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