bin/domainname/domainname.c

   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
  40 static 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
  56 int
  57 main(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
  90 static void
  91 usage(void)
  92 {
  93         (void)fprintf(stderr, "usage: %s [name-of-domain]\n", getprogname());
  94         exit(EXIT_FAILURE);
  95 }