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/*
File: phbs.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
#ifdef HAVE_STRING_H
#include <string.h>
#endif
#ifdef HAVE_TIME_H
#include <time.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#include "types.h"
#include "common.h"
#include "intrf.h"
#ifdef HAVE_NCURSES
#include "intrfn.h"
#endif
#include "list.h"
#include "filegen.h"
#include "photorec.h"
#include "log.h"
#include "file_tar.h"
#include "pnext.h"
#include "phnc.h"
#include "phbs.h"
#include "file_found.h"
#define READ_SIZE 1024*512
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_tar)
extern const file_hint_t file_hint_tar;
#endif
extern file_check_list_t file_check_list;
extern int need_to_stop;
/*@
@ requires \valid(dst);
@ requires \valid_read(src);
@ requires \separated(src, dst);
@*/
static inline void file_recovery_cpy(file_recovery_t *dst, const file_recovery_t *src)
{
memcpy(dst, src, sizeof(*dst));
dst->location.list.prev=&dst->location.list;
dst->location.list.next=&dst->location.list;
}
pstatus_t photorec_find_blocksize(struct ph_param *params, const struct ph_options *options, alloc_data_t *list_search_space)
{
uint64_t offset=0;
unsigned char *buffer_start;
unsigned char *buffer_olddata;
unsigned char *buffer;
time_t start_time;
time_t previous_time;
unsigned int buffer_size;
const unsigned int blocksize=params->blocksize;
const unsigned int read_size=(blocksize>65536?blocksize:65536);
/*@ assert read_size >= 65536; */
alloc_data_t *current_search_space;
file_recovery_t file_recovery;
#ifndef DISABLED_FOR_FRAMAC
params->file_nbr=0;
reset_file_recovery(&file_recovery);
file_recovery.blocksize=blocksize;
buffer_size=blocksize + READ_SIZE;
buffer_start=(unsigned char *)MALLOC(buffer_size);
buffer_olddata=buffer_start;
buffer=buffer_olddata + blocksize;
start_time=time(NULL);
previous_time=start_time;
memset(buffer_olddata, 0, blocksize);
current_search_space=td_list_first_entry(&list_search_space->list, alloc_data_t, list);
if(current_search_space!=list_search_space)
offset=current_search_space->start;
if(options->verbose>0)
info_list_search_space(list_search_space, current_search_space, params->disk->sector_size, 0, options->verbose);
params->disk->pread(params->disk, buffer, READ_SIZE, offset);
while(current_search_space!=list_search_space)
{
const uint64_t old_offset=offset;
{
file_recovery_t file_recovery_new;
file_recovery_new.blocksize=blocksize;
file_recovery_new.location.start=offset;
#if !defined(SINGLE_FORMAT) || defined(SINGLE_FORMAT_tar)
if(file_recovery.file_stat!=NULL && file_recovery.file_stat->file_hint==&file_hint_tar &&
is_valid_tar_header((const struct tar_posix_header *)(buffer-0x200)))
{ /* Currently saving a tar, do not check the data for know header */
}
else
#endif
{
const struct td_list_head *tmpl;
file_recovery_new.file_stat=NULL;
td_list_for_each(tmpl, &file_check_list.list)
{
const struct td_list_head *tmp;
const file_check_list_t *pos=td_list_entry_const(tmpl, const file_check_list_t, list);
td_list_for_each(tmp, &pos->file_checks[buffer[pos->offset]].list)
{
const file_check_t *file_check=td_list_entry_const(tmp, const file_check_t, list);
/*@ assert valid_file_check_node(file_check); */
if((file_check->length==0 || memcmp(buffer + file_check->offset, file_check->value, file_check->length)==0) &&
file_check->header_check(buffer, read_size, 1, &file_recovery, &file_recovery_new)!=0)
{
file_recovery_new.file_stat=file_check->file_stat;
break;
}
}
if(file_recovery_new.file_stat!=NULL)
break;
}
if(file_recovery_new.file_stat!=NULL && file_recovery_new.file_stat->file_hint!=NULL)
{
/* A new file begins, backup file offset */
current_search_space=file_found(current_search_space, offset, file_recovery_new.file_stat);
params->file_nbr++;
file_recovery_cpy(&file_recovery, &file_recovery_new);
}
}
}
/* Check for data EOF */
if(file_recovery.file_stat!=NULL)
{
data_check_t res=DC_CONTINUE;
if(file_recovery.data_check!=NULL)
res=file_recovery.data_check(buffer_olddata, 2*blocksize, &file_recovery);
file_recovery.file_size+=blocksize;
if(res==DC_STOP || res==DC_ERROR)
{
/* EOF found */
reset_file_recovery(&file_recovery);
}
}
/* Check for maximum filesize */
if(file_recovery.file_stat!=NULL && file_recovery.file_stat->file_hint->max_filesize>0 && file_recovery.file_size>=file_recovery.file_stat->file_hint->max_filesize)
{
reset_file_recovery(&file_recovery);
}
if(params->file_nbr >= 10)
{
current_search_space=list_search_space;
}
else
get_next_sector(list_search_space, ¤t_search_space, &offset, blocksize);
if(current_search_space==list_search_space)
{
/* End of disk found => EOF */
reset_file_recovery(&file_recovery);
}
buffer_olddata+=blocksize;
buffer+=blocksize;
if( old_offset+blocksize!=offset ||
buffer+read_size>buffer_start+buffer_size)
{
memcpy(buffer_start, buffer_olddata, blocksize);
buffer_olddata=buffer_start;
buffer=buffer_olddata+blocksize;
if(options->verbose>1)
{
log_verbose("Reading sector %10llu/%llu\n",
(unsigned long long)((offset - params->partition->part_offset) / params->disk->sector_size),
(unsigned long long)((params->partition->part_size-1) / params->disk->sector_size));
}
if(params->disk->pread(params->disk, buffer, READ_SIZE, offset) != READ_SIZE)
{
#ifdef HAVE_NCURSES
wmove(stdscr,11,0);
wclrtoeol(stdscr);
wprintw(stdscr,"Error reading sector %10lu\n",
(unsigned long)((offset - params->partition->part_offset) / params->disk->sector_size));
#endif
}
#ifdef HAVE_NCURSES
{
time_t current_time;
current_time=time(NULL);
if(current_time>previous_time)
{
previous_time=current_time;
if(photorec_progressbar(stdscr, 0, params, offset, current_time))
{
log_info("PhotoRec has been stopped\n");
current_search_space=list_search_space;
}
}
}
#endif
if(need_to_stop!=0)
{
log_info("PhotoRec has been stopped\n");
current_search_space=list_search_space;
}
}
} /* end while(current_search_space!=list_search_space) */
free(buffer_start);
#endif
return PSTATUS_OK;
}
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