1*0a6a1f1dSLionel Sambuc /* $NetBSD: hostname.c,v 1.21 2014/02/13 12:00:29 elric Exp $ */
291c835edSMorgawr
391c835edSMorgawr /*
491c835edSMorgawr * Copyright (c) 1988, 1993
591c835edSMorgawr * The Regents of the University of California. All rights reserved.
691c835edSMorgawr *
791c835edSMorgawr * Redistribution and use in source and binary forms, with or without
891c835edSMorgawr * modification, are permitted provided that the following conditions
991c835edSMorgawr * are met:
1091c835edSMorgawr * 1. Redistributions of source code must retain the above copyright
1191c835edSMorgawr * notice, this list of conditions and the following disclaimer.
1291c835edSMorgawr * 2. Redistributions in binary form must reproduce the above copyright
1391c835edSMorgawr * notice, this list of conditions and the following disclaimer in the
1491c835edSMorgawr * documentation and/or other materials provided with the distribution.
1591c835edSMorgawr * 3. Neither the name of the University nor the names of its contributors
1691c835edSMorgawr * may be used to endorse or promote products derived from this software
1791c835edSMorgawr * without specific prior written permission.
1891c835edSMorgawr *
1991c835edSMorgawr * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
2091c835edSMorgawr * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
2191c835edSMorgawr * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
2291c835edSMorgawr * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
2391c835edSMorgawr * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
2491c835edSMorgawr * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
2591c835edSMorgawr * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
2691c835edSMorgawr * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
2791c835edSMorgawr * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
2891c835edSMorgawr * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
2991c835edSMorgawr * SUCH DAMAGE.
3091c835edSMorgawr */
3191c835edSMorgawr
3291c835edSMorgawr #include <sys/cdefs.h>
3391c835edSMorgawr #ifndef lint
3491c835edSMorgawr __COPYRIGHT("@(#) Copyright (c) 1988, 1993\
3591c835edSMorgawr The Regents of the University of California. All rights reserved.");
3691c835edSMorgawr #endif /* not lint */
3791c835edSMorgawr
3891c835edSMorgawr #ifndef lint
3991c835edSMorgawr #if 0
4091c835edSMorgawr static char sccsid[] = "@(#)hostname.c 8.2 (Berkeley) 4/28/95";
4191c835edSMorgawr #else
42*0a6a1f1dSLionel Sambuc __RCSID("$NetBSD: hostname.c,v 1.21 2014/02/13 12:00:29 elric Exp $");
4391c835edSMorgawr #endif
4491c835edSMorgawr #endif /* not lint */
4591c835edSMorgawr
4691c835edSMorgawr #include <sys/param.h>
4791c835edSMorgawr
4891c835edSMorgawr #include <err.h>
4991c835edSMorgawr #include <stdio.h>
5091c835edSMorgawr #include <stdlib.h>
5191c835edSMorgawr #include <string.h>
5291c835edSMorgawr #include <unistd.h>
5391c835edSMorgawr
5491c835edSMorgawr __dead static void usage(void);
5591c835edSMorgawr
5691c835edSMorgawr int
main(int argc,char * argv[])5791c835edSMorgawr main(int argc, char *argv[])
5891c835edSMorgawr {
59*0a6a1f1dSLionel Sambuc int ch, sflag;
6091c835edSMorgawr char *p, hostname[MAXHOSTNAMELEN + 1];
6191c835edSMorgawr
6291c835edSMorgawr setprogname(argv[0]);
63*0a6a1f1dSLionel Sambuc sflag = 0;
64*0a6a1f1dSLionel Sambuc while ((ch = getopt(argc, argv, "s")) != -1)
6591c835edSMorgawr switch (ch) {
6691c835edSMorgawr case 's':
6791c835edSMorgawr sflag = 1;
6891c835edSMorgawr break;
6991c835edSMorgawr case '?':
7091c835edSMorgawr default:
7191c835edSMorgawr usage();
7291c835edSMorgawr }
7391c835edSMorgawr argc -= optind;
7491c835edSMorgawr argv += optind;
7591c835edSMorgawr
7691c835edSMorgawr if (argc > 1)
7791c835edSMorgawr usage();
7891c835edSMorgawr
7991c835edSMorgawr if (*argv) {
8091c835edSMorgawr if (sethostname(*argv, strlen(*argv)))
8191c835edSMorgawr err(1, "sethostname");
8291c835edSMorgawr } else {
8391c835edSMorgawr if (gethostname(hostname, sizeof(hostname)))
8491c835edSMorgawr err(1, "gethostname");
8591c835edSMorgawr hostname[sizeof(hostname) - 1] = '\0';
8691c835edSMorgawr if (sflag && (p = strchr(hostname, '.')))
8791c835edSMorgawr *p = '\0';
88*0a6a1f1dSLionel Sambuc (void)printf("%s\n", hostname);
8991c835edSMorgawr }
9091c835edSMorgawr exit(0);
9191c835edSMorgawr /* NOTREACHED */
9291c835edSMorgawr }
9391c835edSMorgawr
9491c835edSMorgawr static void
usage(void)9591c835edSMorgawr usage(void)
9691c835edSMorgawr {
97*0a6a1f1dSLionel Sambuc (void)fprintf(stderr, "usage: %s [-s] [name-of-host]\n",
9891c835edSMorgawr getprogname());
9991c835edSMorgawr exit(1);
10091c835edSMorgawr /* NOTREACHED */
10191c835edSMorgawr }
102