/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1987, 1993, 1994
 *      The Regents of the University of California.  All rights reserved.
 * Copyright (c) 2002 Networks Associates Technology, Inc.
 * All rights reserved.
 *
 * Portions of this software were developed for the FreeBSD Project by
 * ThinkSec AS and NAI Labs, the Security Research Division of Network
 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
 * ("CBOSS"), as part of the DARPA CHATS research program.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/types.h>
#include <sys/stat.h>

#include <err.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <libutil.h>            /* must be after pwd.h */

static void     usage(void);

int
main(int argc, char *argv[])
{
        const char *passwd_dir = NULL;
        int ch, pfd, tfd;
        char *line;
        size_t len;

        while ((ch = getopt(argc, argv, "d:")) != -1)
                switch (ch) {
                case 'd':
                        passwd_dir = optarg;
                        break;
                case '?':
                default:
                        usage();
                }

        argc -= optind;
        argv += optind;

        if (argc != 0)
                usage();

        if (pw_init(passwd_dir, NULL) == -1)
                err(1, "pw_init()");
        if ((pfd = pw_lock()) == -1) {
                pw_fini();
                err(1, "pw_lock()");
        }
        if ((tfd = pw_tmp(pfd)) == -1) {
                pw_fini();
                err(1, "pw_tmp()");
        }
        (void)close(tfd);
        /* Force umask for partial writes made in the edit phase */
        (void)umask(077);

        for (;;) {
                switch (pw_edit(0)) {
                case -1:
                        pw_fini();
                        err(1, "pw_edit()");
                case 0:
                        pw_fini();
                        errx(0, "no changes made");
                default:
                        break;
                }
                if (pw_mkdb(NULL) == 0) {
                        pw_fini();
                        errx(0, "password list updated");
                }
                printf("re-edit the password file? ");
                fflush(stdout);
                if ((line = fgetln(stdin, &len)) == NULL) {
                        pw_fini();
                        err(1, "fgetln()");
                }
                if (len > 0 && (*line == 'N' || *line == 'n'))
                        break;
        }
        pw_fini();
        exit(0);
}

static void
usage(void)
{

        (void)fprintf(stderr, "usage: vipw [-d directory]\n");
        exit(1);
}