crypt.c

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/* $Header: /var/cvs/mbdyn/mbdyn/mbdyn-1.0/utils/crypt.c,v 1.18 2017/01/12 15:10:27 masarati Exp $ */
/*
 * MBDyn (C) is a multibody analysis code.
 * http://www.mbdyn.org
 *
 * Copyright (C) 1996-2017
 *
 * Pierangelo Masarati  <masarati@aero.polimi.it>
 *
 * Dipartimento di Ingegneria Aerospaziale - Politecnico di Milano
 * via La Masa, 34 - 20156 Milano, Italy
 * http://www.aero.polimi.it
 *
 * Changing this copyright notice is forbidden.
 *
 * 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 (version 2 of the License).
 *
 *
 * 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
 */

#include "mbconfig.h"           /* This goes first in every *.c,*.cc file */

#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include "ac/getopt.h"

#include <string.h>

#include "crypt.h"

static void
usage(int rc)
{
        fprintf(stderr, "usage: crypt [-f salt] [-h] [-c asserted] cred\n");
        exit(rc);
}

int
main(int argc, char *argv[])
{
#ifndef HAVE_CRYPT
        fprintf(stderr, "no valid crypt available\n");
        exit(EXIT_FAILURE);
#else /* HAVE_CRYPT */

        char    *salt_format = NULL, salt[35];
        char    *asserted_cred = NULL, asserted_cred_buf[35];
        size_t  asserted_cred_len = 0;

        while (1) {
                int     opt = getopt(argc, argv, "c:f:h");

                if (opt == EOF) {
                        break;
                }

                switch (opt) {
                case 'c':
                        asserted_cred = optarg;
                        break;

                case 'f':
                        salt_format = optarg;
                        break;

                case 'h':
                        usage(EXIT_SUCCESS);
                        break;

                default:
                        usage(EXIT_FAILURE);
                }
        }

        if (optind == argc) {
                usage(EXIT_FAILURE);
        }

        (void)mbdyn_make_salt(salt, sizeof(salt), salt_format);
        salt[STRLENOF(salt)] = '\0';

        if (asserted_cred) {
                if (strncmp(asserted_cred, "{CRYPT}", STRLENOF("{CRYPT}")) == 0) {
                        asserted_cred += STRLENOF("{CRYPT}");
                } else {
                        memcpy(asserted_cred_buf, asserted_cred, sizeof(asserted_cred_buf));
                        asserted_cred_buf[STRLENOF(asserted_cred_buf)] = '\0';

                        asserted_cred = crypt(asserted_cred_buf, salt);

                        memcpy(asserted_cred_buf, asserted_cred, sizeof(asserted_cred_buf));
                        asserted_cred[STRLENOF(asserted_cred_buf)] = '\0';
                        asserted_cred = asserted_cred_buf;
                }
                asserted_cred_len = strlen(asserted_cred);
        }

        argv = &argv[optind];
        argc -= optind;

        for (; argc; argc--) {
                char    cred[35];
                char    *c;

                memcpy(cred, argv[0], sizeof(cred));
                cred[STRLENOF(cred)] = '\0';

                if (asserted_cred) {
                        c = crypt(cred, asserted_cred);

                        if (strcmp(c, asserted_cred) == 0) {
                                printf("%s OK\n", c);
                        } else {
                                printf("%s ERR\n", c);
                        }
                } else {
                        c = crypt(cred, salt);
                        printf("%s\n", c);
                }
        }

        return EXIT_SUCCESS;
#endif /* HAVE_CRYPT */ 
}