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/*
File: dimage.c
Copyright (C) 2007-2009 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_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#include <sys/stat.h>
#endif
#include <fcntl.h>
#include <assert.h>
#include <string.h>
#include <errno.h>
#if defined(__FRAMAC__)
#include "__fc_builtin.h"
#endif
#include "types.h"
#include "common.h"
#include "intrf.h"
#include "intrfn.h"
#include "log.h"
#include "dimage.h"
#define READ_SIZE 256*512
/* Skip 10Mb when there is a read error */
#define SKIP_SIZE 10*1024*1024
#ifndef O_LARGEFILE
#define O_LARGEFILE 0
#endif
#ifndef O_BINARY
#define O_BINARY 0
#endif
static void disk_image_backward(int disk_dst, disk_t *disk, const uint64_t src_offset_start, const uint64_t src_offset_end, uint64_t dst_offset)
{
uint64_t src_offset;
unsigned char *buffer=(unsigned char *)MALLOC(disk->sector_size);
for(src_offset=src_offset_end-disk->sector_size; src_offset > src_offset_start; src_offset-=disk->sector_size, dst_offset-=disk->sector_size)
{
const ssize_t pread_res=disk->pread(disk, buffer, disk->sector_size, src_offset);
if((unsigned)pread_res != disk->sector_size)
{
free(buffer);
return;
}
#if defined(HAVE_PWRITE)
if(pwrite(disk_dst, buffer, pread_res, src_offset)<0)
{
free(buffer);
return;
}
#else
if(lseek(disk_dst, src_offset, SEEK_SET)<0)
{
free(buffer);
return;
}
if(write(disk_dst, buffer, pread_res) != pread_res)
{
free(buffer);
return;
}
#endif
}
free(buffer);
}
int disk_image(disk_t *disk, const partition_t *partition, const char *image_dd)
{
int ind_stop=0;
uint64_t nbr_read_error=0;
uint64_t src_offset=partition->part_offset;
uint64_t src_offset_old;
uint64_t dst_offset=0;
const uint64_t src_offset_end=partition->part_offset+partition->part_size;
const uint64_t offset_inc=(src_offset_end-src_offset)/10000;
uint64_t src_offset_next=src_offset;
struct stat stat_buf;
unsigned char *buffer=(unsigned char *)MALLOC(READ_SIZE);
unsigned int readsize=READ_SIZE;
int disk_dst;
#ifdef HAVE_PWRITE
int use_pwrite=1;
#endif
#ifdef HAVE_NCURSES
WINDOW *window;
#endif
assert(disk->sector_size > 0);
assert(disk->sector_size <= READ_SIZE);
if((disk_dst=open(image_dd, O_CREAT|O_LARGEFILE|O_RDWR|O_BINARY, 0644)) < 0)
{
log_error("Can't create file %s.\n",image_dd);
display_message("Can't create file!\n");
free(buffer);
return -1;
}
#if !defined(DISABLED_FOR_FRAMAC)
if(fstat(disk_dst, &stat_buf)==0)
{
int res=1;
#ifdef HAVE_NCURSES
if(stat_buf.st_size > 0)
res=ask_confirmation("Append to existing file ? (Y/N)");
#endif
if(res>0)
{
dst_offset=stat_buf.st_size;
src_offset+=dst_offset;
}
}
#endif
src_offset_old=src_offset;
#ifdef HAVE_NCURSES
window=newwin(LINES, COLS, 0, 0); /* full screen */
aff_copy(window);
wmove(window,5,0);
wprintw(window,"%s\n",disk->description_short(disk));
wmove(window,6,0);
aff_part(window,AFF_PART_ORDER|AFF_PART_STATUS,disk,partition);
wmove(window,10,0);
waddstr(window, "Disk images are mainly used ");
wmove(window,11,0);
waddstr(window, "- for forensic purposes");
wmove(window,12,0);
waddstr(window, "- or to deal with media with bad sectors");
#ifdef WIN32
wmove(window,14,0);
waddstr(window, "To use TestDisk or PhotoRec with this disk image, go in command line and run");
wmove(window,15,0);
waddstr(window, " testdisk_win.exe image.dd");
wmove(window,16,0);
waddstr(window, "or photorec_win.exe image.dd");
#else
wmove(window,14,0);
waddstr(window, "To use TestDisk or PhotoRec with this disk image, start a Terminal and run");
wmove(window,15,0);
waddstr(window, " testdisk image.dd");
wmove(window,16,0);
waddstr(window, "or photorec image.dd");
#endif
wmove(window,22,0);
wattrset(window, A_REVERSE);
waddstr(window," Stop ");
wattroff(window, A_REVERSE);
#endif
while(ind_stop==0 && src_offset < src_offset_end)
{
ssize_t pread_res;
int update=0;
if(src_offset_end-src_offset < readsize)
readsize=src_offset_end-src_offset;
pread_res=disk->pread(disk, buffer, readsize, src_offset);
if(pread_res > 0)
{
#if defined(HAVE_PWRITE)
if(use_pwrite>0 && pwrite(disk_dst, buffer, pread_res, dst_offset)<0)
#endif
{
#ifdef HAVE_PWRITE
use_pwrite=0;
#endif
if(lseek(disk_dst, dst_offset, SEEK_SET)<0)
{
ind_stop=2;
log_critical("disk_image lseek() failed: %s\n",strerror(errno));
}
else if(write(disk_dst, buffer, pread_res) != pread_res)
{
log_critical("disk_image write() failed: %s\n",strerror(errno));
ind_stop=2;
}
}
if(src_offset_old + SKIP_SIZE==src_offset)
{
disk_image_backward(disk_dst, disk, src_offset_old, src_offset, dst_offset);
}
}
src_offset_old=src_offset;
if((unsigned)pread_res == readsize)
{
src_offset+=readsize;
dst_offset+=readsize;
readsize=READ_SIZE;
}
else
{
update=1;
nbr_read_error++;
readsize=disk->sector_size;
src_offset+=SKIP_SIZE;
dst_offset+=SKIP_SIZE;
}
if(src_offset>src_offset_next)
{
update=1;
src_offset_next=src_offset+offset_inc;
}
if(update && ind_stop==0)
{
#ifdef HAVE_NCURSES
unsigned int i;
const float percent=(src_offset-partition->part_offset)*100.00/partition->part_size;
wmove(window,7,0);
wprintw(window,"%3.2f %% ", percent);
for(i=0;i<percent*3/5;i++)
wprintw(window,"=");
wprintw(window,">");
wrefresh(window);
ind_stop=check_enter_key_or_s(window);
#endif
}
}
close(disk_dst);
#ifdef HAVE_NCURSES
delwin(window);
(void) clearok(stdscr, TRUE);
#ifdef HAVE_TOUCHWIN
touchwin(stdscr);
#endif
#endif
if(ind_stop==2)
{
display_message("No space left for the file image.\n");
free(buffer);
return -2;
}
if(ind_stop)
{
if(nbr_read_error==0)
display_message("Incomplete image created.\n");
else
display_message("Incomplete image created: read errors have occured.\n");
free(buffer);
return 0;
}
if(nbr_read_error==0)
display_message("Image created successfully.\n");
else
display_message("Image created successfully but read errors have occured.\n");
free(buffer);
return 0;
}
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