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verify.c
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verify.c
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/* $Id: verify.c,v 1.3 2005/05/13 18:52:06 harbourn Exp $
* dcfldd - The Enhanced Forensic DD
* By Nicholas Harbour
*/
/* Copyright (C) 85, 90, 91, 1995-2001, 2005 Free Software Foundation, Inc.
This program 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, 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 to the Free Software Foundation,
Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/* GNU dd originally written by Paul Rubin, David MacKenzie, and Stuart Kemp. */
#include <stdlib.h>
#include <sys/types.h>
#include <string.h>
#include "config.h"
#include "dcfldd.h"
#include "hash.h"
#include "getpagesize.h"
#include "safe-read.h"
#include "sizeprobe.h"
#include "pattern.h"
#include "util.h"
#include "log.h"
static int verify_update(hashlist_t *, void *, void *, size_t, size_t);
static void verify_remainder(hashlist_t *);
/* The name of the verify file, or NULL if none.
* Verify file is used as a secondary input file and the input
* file is compared against it via the use of their hashes. */
char *verify_file = NULL;
int verify_fd;
FILE *verify_log;
/* Skip this many records of `input_blocksize' bytes before reading */
uintmax_t vskip_records = 0;
static int verify_update(hashlist_t *hashl,
void *ibuf, void *vbuf,
size_t ilen, size_t vlen)
{
size_t left_in_window = hash_windowlen - (bytes_in_window);
int cmp = 0;
if (bytes_in_total == 0) {
hashl_init(hashl, TOTAL_CTX);
hashl_init(hashl, VTOTAL_CTX);
}
if (hash_windowlen == 0) {
hash_update_buf(hashl, WINDOW_CTX, TOTAL_CTX, ibuf, ilen);
hash_update_buf(hashl, VWINDOW_CTX, VTOTAL_CTX, vbuf, vlen);
} else {
if (bytes_in_window == 0) {
hashl_init(hashl, WINDOW_CTX);
hashl_init(hashl, VWINDOW_CTX);
}
if (ilen >= left_in_window || vlen >= left_in_window) {
char *ihash, *vhash;
hash_update_buf(hashl, WINDOW_CTX, TOTAL_CTX,
ibuf, min(ilen, left_in_window));
hash_update_buf(hashl, VWINDOW_CTX, VTOTAL_CTX,
vbuf, min(vlen, left_in_window));
/* if verify ever wants to do more than one hash, change this */
hashl_final(hashl, WINDOW_CTX);
ihash = strdup(hashl->hash->hashstr_buf);
hashl_final(hashl, VWINDOW_CTX);
vhash = hashl->hash->hashstr_buf;
cmp = memcmp(ihash, vhash, hashl->hash->hashstr_buf_size);
free(ihash);
if (cmp != 0)
{
log_verifywindow(hashl->hash, window_beginning,
(window_beginning + hash_windowlen), cmp);
return 1;
}
window_beginning += hash_windowlen;
bytes_in_window = 0;
verify_update(hashl, ibuf + left_in_window, vbuf + left_in_window,
ilen - left_in_window, vlen - left_in_window);
} else {
hash_update_buf(hashl, WINDOW_CTX, TOTAL_CTX, ibuf, ilen);
hash_update_buf(hashl, VWINDOW_CTX, VTOTAL_CTX, vbuf, vlen);
}
}
return 0;
}
static void verify_remainder(hashlist_t *hashl)
{
int cmp = 0;
if (hash_windowlen > 0 && bytes_in_window > 0) {
char *ihash, *vhash;
hashl_final(hashl, WINDOW_CTX);
ihash = strdup(hashl->hash->hashstr_buf);
hashl_final(hashl, VWINDOW_CTX);
vhash = hashl->hash->hashstr_buf;
cmp = memcmp(ihash, vhash, hashl->hash->hashstr_buf_size);
free(ihash);
if (cmp != 0)
log_verifywindow(hashl->hash, window_beginning,
(window_beginning + hash_windowlen), cmp);
}
}
/* The main loop when using the verify option. */
int dd_verify(void)
{
unsigned char *ibuf; /* Input buffer. */
unsigned char *vbuf; /* Verify buffer. */
unsigned char *real_ibuf;
unsigned char *real_vbuf;
ssize_t i_nread; /* Bytes read in the current input block. */
ssize_t v_nread; /* Bytes read in the current verify block. */
int exit_status = 0;
int input_from_stream = !!input_file;
int input_from_pattern = !input_from_stream;
size_t page_size = getpagesize();
size_t n_bytes_read;
char *i_hashstr_buf;
char *v_hashstr_buf;
size_t left_in_window;
int mismatch = 0;
int cmp = 0;
real_ibuf = (unsigned char *) malloc(input_blocksize
+ 2 * SWAB_ALIGN_OFFSET
+ 2 * page_size - 1);
ibuf = real_ibuf;
ibuf += SWAB_ALIGN_OFFSET; /* allow space for swab */
ibuf = PTR_ALIGN(ibuf, page_size);
real_vbuf = (unsigned char *) malloc(input_blocksize
+ 2 * SWAB_ALIGN_OFFSET
+ 2 * page_size - 1);
vbuf = real_vbuf;
vbuf += SWAB_ALIGN_OFFSET; /* allow space for swab */
vbuf = PTR_ALIGN(vbuf, page_size);
i_hashstr_buf = malloc(hashstr_buf_size);
v_hashstr_buf = malloc(hashstr_buf_size);
if (!input_from_pattern)
if (skip_records != 0)
skip(STDIN_FILENO, input_file, skip_records, input_blocksize, ibuf);
if (vskip_records != 0)
skip(verify_fd, verify_file, vskip_records, input_blocksize, vbuf);
if (max_records == 0)
quit(exit_status);
if (input_from_pattern) {
replicate_pattern(pattern, ibuf, input_blocksize);
i_nread = input_blocksize;
}
while (1)
{
/* Display an update message */
if (do_status && w_full % update_thresh == 0 && w_full != 0)
{
off_t total_bytes = w_full * input_blocksize;
off_t total_mb = total_bytes / 1048576;
if (probe == PROBE_NONE || probed_size == 0)
fprintf(stderr, "\r%llu blocks (%lluMb) written.",
w_full, total_mb);
else {
time_t curr_time = time(NULL);
int seconds = (int)difftime(curr_time, start_time);
off_t probed_mb = probed_size / 1048576;
float fprcnt = total_bytes / (float)probed_size;
float fprcnt_remaining = 1.0 - fprcnt;
int prcnt = (int)(fprcnt * 100);
int seconds_remaining = (int)(seconds *
(fprcnt_remaining / fprcnt));
char secstr[100];
time_left(secstr, sizeof secstr, seconds_remaining);
fprintf(stderr,
"\r[%d%% of %lluMb] %llu blocks (%lluMb) written. %s",
prcnt, probed_mb, w_full, total_mb, secstr);
}
}
if (r_partial + r_full >= max_records)
break;
v_nread = safe_read(verify_fd, vbuf, input_blocksize);
if (v_nread < 0)
syscall_error(input_file);
/* Zero the buffer before reading, so that if we get a read error,
whatever data we are able to read is followed by zeros.
This minimizes data loss. */
if (input_from_pattern) {
replicate_pattern(pattern, ibuf, v_nread);
i_nread = v_nread;
} else
i_nread = safe_read(STDIN_FILENO, ibuf, input_blocksize);
if (i_nread < 0 && !input_from_pattern)
syscall_error(input_file);
if (i_nread == 0 && v_nread == 0)
break;
left_in_window = hash_windowlen - bytes_in_window;
mismatch = verify_update(ihashlist, ibuf, vbuf, i_nread, v_nread);
if (i_nread != v_nread || (mismatch && i_nread < left_in_window)) {
log_verifywindow(ihashlist->hash, window_beginning,
(window_beginning + bytes_in_window), 1);
mismatch = 1;
}
if (mismatch)
break;
}
free(real_ibuf);
free(real_vbuf);
/* verifying a remainder and total wouldnt make sense if we
* they won't match due to different amounts read.
*/
if (!mismatch) {
char *ihash, *vhash;
verify_remainder(ihashlist);
hashl_final(ihashlist, TOTAL_CTX);
ihash = strdup(ihashlist->hash->hashstr_buf);
hashl_final(ihashlist, VTOTAL_CTX);
vhash = ihashlist->hash->hashstr_buf;
cmp = memcmp(ihash, vhash, ihashlist->hash->hashstr_buf_size);
free(ihash);
if (cmp != 0)
log_verifywindow(ihashlist->hash, window_beginning,
(window_beginning + bytes_in_window), cmp);
log_verifytotal(ihashlist->hash, cmp);
} else
log_verifytotal(ihashlist->hash, 1);
return exit_status;
}