1 /* $OpenBSD: hostname.c,v 1.7 2003/06/02 23:32:08 millert Exp $ */
2 /* $NetBSD: hostname.c,v 1.10 1995/09/07 06:28:40 jtc Exp $ */
3
4 /*
5 * Copyright (c) 1988, 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 static char copyright[] =
35 "@(#) Copyright (c) 1988, 1993\n\
36 The Regents of the University of California. All rights reserved.\n";
37 #endif /* not lint */
38
39 #ifndef lint
40 #if 0
41 static char sccsid[] = "@(#)hostname.c 8.2 (Berkeley) 4/28/95";
42 #else
43 static char rcsid[] = "$OpenBSD: hostname.c,v 1.7 2003/06/02 23:32:08 millert Exp $";
44 #endif
45 #endif /* not lint */
46
47 #include <sys/param.h>
48
49 #include <err.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 #include <unistd.h>
54
55 extern char *__progname;
56
57 void usage(void);
58
59 int
main(int argc,char * argv[])60 main(int argc, char *argv[])
61 {
62 int ch, sflag;
63 char *p, hostname[MAXHOSTNAMELEN];
64
65 sflag = 0;
66 while ((ch = getopt(argc, argv, "s")) != -1)
67 switch (ch) {
68 case 's':
69 sflag = 1;
70 break;
71 default:
72 usage();
73 }
74 argc -= optind;
75 argv += optind;
76
77 if (argc > 1)
78 usage();
79
80 if (*argv) {
81 if (sethostname(*argv, strlen(*argv)))
82 err(1, "sethostname");
83 } else {
84 if (gethostname(hostname, sizeof(hostname)))
85 err(1, "gethostname");
86 if (sflag && (p = strchr(hostname, '.')))
87 *p = '\0';
88 (void)printf("%s\n", hostname);
89 }
90 exit(0);
91 }
92
93 void
usage(void)94 usage(void)
95 {
96 (void)fprintf(stderr, "usage: %s [-s] [name-of-host]\n", __progname);
97 exit(1);
98 }
99