1 /* $OpenBSD: domainname.c,v 1.10 2016/02/01 22:26:39 gsoares Exp $ */ 2 /* $NetBSD: domainname.c,v 1.7 1995/03/21 09:04:22 cgd 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 #include <err.h> 34 #include <stdio.h> 35 #include <stdlib.h> 36 #include <string.h> 37 #include <unistd.h> 38 #include <limits.h> 39 40 extern char *__progname; 41 42 static void __dead usage(void); 43 44 int 45 main(int argc, char *argv[]) 46 { 47 int ch; 48 char domainname[HOST_NAME_MAX+1]; 49 50 while ((ch = getopt(argc, argv, "")) != -1) 51 switch (ch) { 52 default: 53 usage(); 54 } 55 argc -= optind; 56 argv += optind; 57 58 if (argc > 1) 59 usage(); 60 61 if (*argv) { 62 if (setdomainname(*argv, strlen(*argv))) 63 err(1, "setdomainname"); 64 } else { 65 if (getdomainname(domainname, sizeof(domainname))) 66 err(1, "getdomainname"); 67 (void)printf("%s\n", domainname); 68 } 69 return(0); 70 } 71 72 static void __dead 73 usage(void) 74 { 75 (void)fprintf(stderr, "usage: %s [name-of-domain]\n", __progname); 76 exit(1); 77 } 78