1*080f3bb5Sgsoares /* $OpenBSD: hostname.c,v 1.10 2016/02/01 22:27:25 gsoares Exp $ */
2df930be7Sderaadt /* $NetBSD: hostname.c,v 1.10 1995/09/07 06:28:40 jtc Exp $ */
3df930be7Sderaadt
4df930be7Sderaadt /*
5df930be7Sderaadt * Copyright (c) 1988, 1993
6df930be7Sderaadt * The Regents of the University of California. All rights reserved.
7df930be7Sderaadt *
8df930be7Sderaadt * Redistribution and use in source and binary forms, with or without
9df930be7Sderaadt * modification, are permitted provided that the following conditions
10df930be7Sderaadt * are met:
11df930be7Sderaadt * 1. Redistributions of source code must retain the above copyright
12df930be7Sderaadt * notice, this list of conditions and the following disclaimer.
13df930be7Sderaadt * 2. Redistributions in binary form must reproduce the above copyright
14df930be7Sderaadt * notice, this list of conditions and the following disclaimer in the
15df930be7Sderaadt * documentation and/or other materials provided with the distribution.
1629295d1cSmillert * 3. Neither the name of the University nor the names of its contributors
17df930be7Sderaadt * may be used to endorse or promote products derived from this software
18df930be7Sderaadt * without specific prior written permission.
19df930be7Sderaadt *
20df930be7Sderaadt * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21df930be7Sderaadt * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22df930be7Sderaadt * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23df930be7Sderaadt * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24df930be7Sderaadt * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25df930be7Sderaadt * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26df930be7Sderaadt * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27df930be7Sderaadt * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28df930be7Sderaadt * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29df930be7Sderaadt * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30df930be7Sderaadt * SUCH DAMAGE.
31df930be7Sderaadt */
32df930be7Sderaadt
33df930be7Sderaadt #include <err.h>
34df930be7Sderaadt #include <stdio.h>
35df930be7Sderaadt #include <stdlib.h>
36df930be7Sderaadt #include <string.h>
37df930be7Sderaadt #include <unistd.h>
38b9fc9a72Sderaadt #include <limits.h>
39df930be7Sderaadt
409517852aSmpech extern char *__progname;
419517852aSmpech
42*080f3bb5Sgsoares static void __dead usage(void);
43df930be7Sderaadt
44df930be7Sderaadt int
main(int argc,char * argv[])45ab83b6d6Sderaadt main(int argc, char *argv[])
46df930be7Sderaadt {
47df930be7Sderaadt int ch, sflag;
48b9fc9a72Sderaadt char *p, hostname[HOST_NAME_MAX+1];
49df930be7Sderaadt
50df930be7Sderaadt sflag = 0;
51df930be7Sderaadt while ((ch = getopt(argc, argv, "s")) != -1)
52df930be7Sderaadt switch (ch) {
53df930be7Sderaadt case 's':
54df930be7Sderaadt sflag = 1;
55df930be7Sderaadt break;
56df930be7Sderaadt default:
57df930be7Sderaadt usage();
58df930be7Sderaadt }
59df930be7Sderaadt argc -= optind;
60df930be7Sderaadt argv += optind;
61df930be7Sderaadt
62df930be7Sderaadt if (argc > 1)
63df930be7Sderaadt usage();
64df930be7Sderaadt
65df930be7Sderaadt if (*argv) {
66df930be7Sderaadt if (sethostname(*argv, strlen(*argv)))
67df930be7Sderaadt err(1, "sethostname");
68df930be7Sderaadt } else {
69df930be7Sderaadt if (gethostname(hostname, sizeof(hostname)))
70df930be7Sderaadt err(1, "gethostname");
71df930be7Sderaadt if (sflag && (p = strchr(hostname, '.')))
72df930be7Sderaadt *p = '\0';
73df930be7Sderaadt (void)printf("%s\n", hostname);
74df930be7Sderaadt }
75*080f3bb5Sgsoares return(0);
76df930be7Sderaadt }
77df930be7Sderaadt
78*080f3bb5Sgsoares static void __dead
usage(void)79ab83b6d6Sderaadt usage(void)
80df930be7Sderaadt {
819517852aSmpech (void)fprintf(stderr, "usage: %s [-s] [name-of-host]\n", __progname);
82df930be7Sderaadt exit(1);
83df930be7Sderaadt }
84