domainname.c revision 331722 
1/*-
2 * Copyright (c) 1988, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#if 0
31#ifndef lint
32static char const copyright[] =
33"@(#) Copyright (c) 1988, 1993\n\
34	The Regents of the University of California.  All rights reserved.\n";
35#endif /* not lint */
36
37#ifndef lint
38static char const sccsid[] = "From: @(#)hostname.c	8.1 (Berkeley) 5/31/93";
39#endif /* not lint */
40#endif
41#include <sys/cdefs.h>
42__FBSDID("$FreeBSD: stable/11/bin/domainname/domainname.c 331722 2018-03-29 02:50:57Z eadler $");
43
44#include <sys/param.h>
45
46#include <err.h>
47#include <stdio.h>
48#include <stdlib.h>
49#include <string.h>
50#include <unistd.h>
51
52static void usage(void);
53
54int
55main(int argc, char *argv[])
56{
57	int ch;
58	char domainname[MAXHOSTNAMELEN];
59
60	while ((ch = getopt(argc, argv, "")) != -1)
61		switch (ch) {
62		case '?':
63			/* fall through */
64		default:
65			usage();
66		}
67	argc -= optind;
68	argv += optind;
69
70	if (argc > 1)
71		usage();
72
73	if (*argv) {
74		if (setdomainname(*argv, (int)strlen(*argv)))
75			err(1, "setdomainname");
76	} else {
77		if (getdomainname(domainname, (int)sizeof(domainname)))
78			err(1, "getdomainname");
79		(void)printf("%s\n", domainname);
80	}
81	exit(0);
82}
83
84static void
85usage(void)
86{
87	(void)fprintf(stderr, "usage: domainname [ypdomain]\n");
88	exit(1);
89}
90