usr/src/cmd/hostname/hostname.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * University Copyright- Copyright (c) 1982, 1986, 1988
  24  * The Regents of the University of California
  25  * All Rights Reserved
  26  *
  27  * University Acknowledgment- Portions of this document are derived from
  28  * software developed by the University of California, Berkeley, and its
  29  * contributors.
  30  */
  31
  32 /*
  33  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
  34  * Use is subject to license terms.
  35  */
  36
  37 /* Portions Copyright 2007 Jeremy Teo */
  38 /* Portions Copyright 2006 Stephen P. Potter */
  39
  40 #include <unistd.h>
  41 #include <stdio.h>
  42 #include <string.h>
  43 #include <locale.h>
  44 #include <libgen.h>
  45 #include <stdlib.h>
  46 #include <errno.h>
  47 #include <netdb.h>
  48
  49 #ifndef TEXT_DOMAIN             /* should be defined by cc -D */
  50 #define TEXT_DOMAIN "SYS_TEST"  /* use this only if it wasn't */
  51 #endif
  52
  53 static char *progname;
  54
  55 static void
  56 usage(void)
  57 {
  58         (void) fprintf(stderr, gettext("usage: %s [-s] [system_name]\n"),
  59             basename(progname));
  60         exit(1);
  61 }
  62
  63 int
  64 main(int argc, char *argv[])
  65 {
  66         char    *nodename = NULL;
  67         char    c_hostname[MAXHOSTNAMELEN];
  68         int     optlet;
  69         int     sflag = 0;
  70         char    *optstring = "s";
  71
  72         (void) setlocale(LC_ALL, "");
  73         (void) textdomain(TEXT_DOMAIN);
  74
  75         progname = argv[0];
  76
  77         opterr = 0;
  78         while ((optlet = getopt(argc, argv, optstring)) != -1) {
  79                 switch (optlet) {
  80                 case 's':
  81                         sflag = 1;
  82                         break;
  83                 case '?':
  84                         usage();
  85                         break;
  86                 }
  87         }
  88
  89         /*
  90          * if called with no arguments, just print out the hostname/nodename
  91          */
  92         if (argc <= optind) {
  93                 if (gethostname(c_hostname, sizeof (c_hostname)) < 0) {
  94                         (void) fprintf(stderr,
  95                             gettext("%s: unable to obtain hostname\n"),
  96                             basename(progname));
  97                         exit(1);
  98                 } else {
  99                         if (sflag)
 100                                 c_hostname[strcspn(c_hostname, ".")] = '\0';
 101                         (void) fprintf(stdout, "%s\n", c_hostname);
 102                 }
 103         } else {
 104                 /*
 105                  * if called with an argument,
 106                  * we have to try to set the new hostname/nodename
 107                  */
 108                 if (argc > optind + 1)
 109                         usage();        /* too many arguments */
 110
 111                 nodename = argv[optind];
 112                 if (sethostname(nodename, strlen(nodename)) < 0) {
 113                         int err = errno;
 114                         (void) fprintf(stderr,
 115                             gettext("%s: error in setting name: %s\n"),
 116                             basename(progname), strerror(err));
 117                         exit(1);
 118                 }
 119         }
 120         return (0);
 121 }