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rcsid[] and sccsid[] and copyright[] are essentially unmaintained (and
unmaintainable).  these days, people use source.  these id's do not provide
any benefit, and do hurt the small install media
(the 33,000 line diff is essentially mechanical)
ok with the idea millert, ok dms

/*	$OpenBSD: passwd.c,v 1.25 2009/10/27 23:59:41 deraadt Exp $	*/

/*
 * Copyright (c) 1988 The Regents of the University of California.
 * All rights reserved.
 *
 * 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 <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <err.h>
#include <rpcsvc/ypclnt.h>

#if defined(KRB5)
#include <sys/stat.h>
#endif

/*
 * Note on configuration:
 *      Generally one would not use both Kerberos and YP
 *      to maintain passwords.
 *
 */

int use_kerberos;
int use_yp;

#ifdef YP
int force_yp;
#endif

extern int local_passwd(char *, int);
extern int yp_passwd(char *);
extern int krb5_passwd(int, char **);
extern int _yp_check(char **);
void usage(int retval);

int
main(int argc, char **argv)
{
	extern int optind;
	char *username;
	int ch;
#ifdef	YP
	int status = 0;
#endif
#if defined(KRB5)
	char *ccfile;
	struct stat sb;

	if (!(ccfile = getenv("KRB5CCNAME")))
		if (asprintf(&ccfile, "/tmp/krb5cc_%u", (unsigned)getuid()) ==
		    -1)
			errx(1, "out of memory");

	if ((stat(ccfile, &sb) == 0) && (sb.st_uid == getuid()))
		use_kerberos = 1;
#endif
#ifdef	YP
	use_yp = _yp_check(NULL);
	if (use_yp) {
		char *dom;

		yp_get_default_domain(&dom);
		yp_unbind(dom);
	}
#endif

	/* Process args and options */
	while ((ch = getopt(argc, argv, "lyK")) != -1)
		switch (ch) {
		case 'l':		/* change local password file */
			use_kerberos = 0;
			use_yp = 0;
			break;
		case 'K':
#if defined(KRB5)
			/* Skip programname and '-K' option */
			argc -= 2;
			argv += 2;
			exit(krb5_passwd(argc, argv));
#else
			errx(1, "KerberosV support not enabled");
			break;
#endif
		case 'y':		/* change YP password */
#ifdef	YP
			if (!use_yp) {
				fprintf(stderr, "passwd: YP not in use.\n");
				exit(1);
			}
			use_kerberos = 0;
			use_yp = 1;
			force_yp = 1;
			break;
#else
			fprintf(stderr, "passwd: YP not compiled in\n");
			exit(1);
#endif
		default:
			usage(1);
		}

	argc -= optind;
	argv += optind;

	username = getlogin();
	if (username == NULL) {
		fprintf(stderr, "passwd: who are you ??\n");
		exit(1);
	}

	switch (argc) {
	case 0:
		break;
	case 1:
		username = argv[0];
		break;
	default:
		usage(1);
	}

#if defined(KRB5)
	if (use_kerberos)
		exit(krb5_passwd(argc, argv));
#endif
#ifdef	YP
	if (force_yp || ((status = local_passwd(username, 0)) && use_yp))
		exit(yp_passwd(username));
	exit(status);
#else
	exit(local_passwd(username, 0));
#endif
}

void
usage(int retval)
{
	fprintf(stderr, "usage: passwd [-K | -l | -y] [user]\n");
	exit(retval);
}