domainname.c revision 1.15 
1/*	$NetBSD: domainname.c,v 1.15 2011/08/29 14:51:18 joerg Exp $	*/
2
3/*
4 * Copyright (c) 1988, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#include <sys/cdefs.h>
33#ifndef lint
34__COPYRIGHT("@(#) Copyright (c) 1988, 1993\
35 The Regents of the University of California.  All rights reserved.");
36#endif /* not lint */
37
38#ifndef lint
39#if 0
40static char sccsid[] = "@(#)hostname.c	8.1 (Berkeley) 5/31/93";
41#else
42__RCSID("$NetBSD: domainname.c,v 1.15 2011/08/29 14:51:18 joerg Exp $");
43#endif
44#endif /* not lint */
45
46#include <sys/param.h>
47
48#include <err.h>
49#include <stdio.h>
50#include <stdlib.h>
51#include <string.h>
52#include <unistd.h>
53
54__dead static void usage(void);
55
56int
57main(int argc, char *argv[])
58{
59	int ch;
60	char domainname[MAXHOSTNAMELEN];
61
62	setprogname(argv[0]);
63
64	while ((ch = getopt(argc, argv, "")) != -1) {
65		switch (ch) {
66		case '?':
67		default:
68			usage();
69			/* NOTREACHED */
70		}
71	}
72	argc -= optind;
73	argv += optind;
74
75	if (argc > 1)
76		usage();
77
78	if (*argv) {
79		if (setdomainname(*argv, strlen(*argv)))
80			err(1, "setdomainname");
81	} else {
82		if (getdomainname(domainname, sizeof(domainname)))
83			err(1, "getdomainname");
84		(void)printf("%s\n", domainname);
85	}
86	exit(EXIT_SUCCESS);
87	/* NOTREACHED */
88}
89
90static void
91usage(void)
92{
93	(void)fprintf(stderr, "usage: %s [name-of-domain]\n", getprogname());
94	exit(EXIT_FAILURE);
95}
96