1 /* 2 * Copyright (c) 1988, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#) Copyright (c) 1988, 1993 The Regents of the University of California. All rights reserved. 30 * @(#)hostname.c 8.1 (Berkeley) 5/31/93 31 * $FreeBSD: src/bin/domainname/domainname.c,v 1.12.2.1 2001/08/01 02:32:16 obrien Exp $ 32 * $DragonFly: src/bin/domainname/domainname.c,v 1.7 2005/03/01 23:12:37 liamfoy Exp $ 33 */ 34 35 #include <sys/param.h> 36 37 #include <err.h> 38 #include <stdio.h> 39 #include <stdlib.h> 40 #include <string.h> 41 #include <unistd.h> 42 43 static void usage(void); 44 45 int 46 main(int argc, char **argv) 47 { 48 int ch; 49 char domainname[MAXHOSTNAMELEN]; 50 51 while ((ch = getopt(argc, argv, "")) != -1) { 52 switch (ch) { 53 default: 54 usage(); 55 } 56 } 57 argc -= optind; 58 argv += optind; 59 60 if (argc > 1) 61 usage(); 62 63 if (argv[0] != NULL) { 64 size_t len = strlen(argv[0]); 65 if (len > MAXHOSTNAMELEN) 66 errx(1, "domain name too long"); 67 68 if (setdomainname(*argv, len)) 69 err(1, "setdomainname"); 70 } else { 71 if (getdomainname(domainname, sizeof(domainname))) 72 err(1, "getdomainname"); 73 domainname[MAXHOSTNAMELEN-1] = '\0'; 74 printf("%s\n", domainname); 75 } 76 exit(0); 77 } 78 79 static void 80 usage(void) 81 { 82 fprintf(stderr, "usage: domainname [ypdomain]\n"); 83 exit(1); 84 } 85