96 lines
2.2 KiB
C
96 lines
2.2 KiB
C
/*
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* Copyright (C) 2013 STRATO. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License v2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public
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* License along with this program; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 021110-1307, USA.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "crc32c.h"
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#include "utils.h"
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void print_usage(int status)
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{
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printf("usage: btrfs-crc filename\n");
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printf(" print out the btrfs crc for \"filename\"\n");
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printf("usage: btrfs-crc -c crc [-s seed] [-l length]\n");
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printf(" brute force search for file names with the given crc\n");
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printf(" -s seed the random seed (default: random)\n");
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printf(" -l length the length of the file names (default: 10)\n");
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printf("usage: btrfs-crc -h\n");
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printf(" print this message\n");
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exit(status);
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}
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int main(int argc, char **argv)
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{
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int c;
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unsigned long checksum = 0;
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char *str;
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char *buf;
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int length = 10;
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u64 seed = 0;
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int loop = 0;
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int i;
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while ((c = getopt(argc, argv, "l:c:s:h")) != -1) {
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switch (c) {
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case 'l':
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length = atol(optarg);
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break;
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case 'c':
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sscanf(optarg, "%li", &checksum);
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loop = 1;
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break;
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case 's':
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seed = atoll(optarg);
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break;
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case 'h':
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print_usage(1);
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case '?':
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print_usage(255);
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}
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}
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set_argv0(argv);
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str = argv[optind];
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if (!loop) {
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if (check_argc_exact(argc - optind, 1))
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print_usage(255);
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printf("%12u - %s\n", crc32c(~1, str, strlen(str)), str);
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return 0;
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}
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if (check_argc_exact(argc - optind, 0))
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print_usage(255);
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buf = malloc(length);
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if (!buf)
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return -ENOMEM;
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if (seed)
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init_rand_seed(seed);
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while (1) {
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for (i = 0; i < length; i++)
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buf[i] = rand_range(94) + 33;
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if (crc32c(~1, buf, length) == checksum)
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printf("%12lu - %.*s\n", checksum, length, buf);
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}
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return 0;
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}
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