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csum-test.c
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csum-test.c
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/*
* csum-test.c
*
* Test the checksumming code of duperemove. You can compare the
* output of this software with that of 'sha256sum'
*
* Copyright (C) 2014 SUSE. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License version 2 as published by the Free Software Foundation.
*
* 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.
*
* Authors: Mark Fasheh <[email protected]>
*/
/*
* Use this for two tests:
*
* - hash a file so we can compare the result against a 3rd party tool
* using the same hash.
* - test that one-off and running checksum functions return the same
* digest for the same input. For example:
* $ dd if=/dev/urandom of=4kfilerand count=1 bs=4096
* $ ./csum-test -b 1024 4kfilerand
* $ ./csum-test -b 4096 4kfilerand
* both runs of csum-test above should show the same digest.
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include "csum.h"
static unsigned int buf_len = 4096;
static unsigned char *buf = NULL;
static unsigned char digest[DIGEST_LEN_MAX] = { 0, };
static char *user_hash = DEFAULT_HASH_STR;
enum {
HASH_OPTION = CHAR_MAX + 1,
};
static int parse_opts(int argc, char **argv, char **fname)
{
int c;
static struct option long_ops[] = {
{ "hash", 1, 0, HASH_OPTION },
{ 0, 0, 0, 0}
};
if (argc < 2)
return 1;
while ((c = getopt_long(argc, argv, "b:", long_ops, NULL))
!= -1) {
switch (c) {
case 'b':
buf_len = atoi(optarg);
printf("User provided buffer len: %u\n", buf_len);
break;
case HASH_OPTION:
user_hash = optarg;
break;
default:
return 1;
}
}
*fname = argv[optind];
return 0;
}
int main(int argc, char **argv)
{
char *fname = NULL;
int fd, ret;
ssize_t len;
struct stat s;
struct running_checksum *csum;
ret = parse_opts(argc, argv, &fname);
if (ret) {
fprintf(stderr, "Usage: %s [-b buflen] [--hash=hash_type] filename\n", argv[0]);
return 1;
}
ret = init_csum_module(user_hash);
if (ret)
return ret;
buf = malloc(buf_len);
if (buf == NULL)
return ENOMEM;
fd = open(fname, O_RDONLY);
if (fd < 0)
return errno;
/*
* If the test file size is less than BUF_LEN we'll exercise
* the one-shot function. Otherwise, do a running checksum.
*/
ret = fstat(fd, &s);
if (ret)
return errno;
if (s.st_size == 0)
return 0;
if (s.st_size <= buf_len) {
printf("File size is smaller than buffer, using one shot\n");
len = read(fd, buf, buf_len);
if (len < 0)
return errno;
if (len == 0)
return 1;
checksum_block((char *)buf, len, digest);
} else {
printf("File size is larger than buffer, using running "
"checksum\n");
csum = start_running_checksum();
while (1) {
len = read(fd, buf, buf_len);
if (len < 0)
return errno;
if (len) {
add_to_running_checksum(csum, len, buf);
} else
break; /* EOF */
}
finish_running_checksum(csum, digest);
}
debug_print_digest(stdout, digest);
printf(" %s\n", fname);
return 0;
}