hostname.c revision 250037
1139969Simp/*- 21556Srgrimes * Copyright (c) 1988, 1993 31556Srgrimes * The Regents of the University of California. All rights reserved. 41556Srgrimes * 51556Srgrimes * Redistribution and use in source and binary forms, with or without 61556Srgrimes * modification, are permitted provided that the following conditions 71556Srgrimes * are met: 81556Srgrimes * 1. Redistributions of source code must retain the above copyright 91556Srgrimes * notice, this list of conditions and the following disclaimer. 101556Srgrimes * 2. Redistributions in binary form must reproduce the above copyright 111556Srgrimes * notice, this list of conditions and the following disclaimer in the 121556Srgrimes * documentation and/or other materials provided with the distribution. 131556Srgrimes * 4. Neither the name of the University nor the names of its contributors 141556Srgrimes * may be used to endorse or promote products derived from this software 151556Srgrimes * without specific prior written permission. 161556Srgrimes * 171556Srgrimes * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 181556Srgrimes * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 191556Srgrimes * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 201556Srgrimes * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 211556Srgrimes * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 221556Srgrimes * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 231556Srgrimes * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 241556Srgrimes * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 251556Srgrimes * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 261556Srgrimes * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 271556Srgrimes * SUCH DAMAGE. 281556Srgrimes */ 291556Srgrimes 30114433Sobrien#if 0 311556Srgrimes#ifndef lint 3220415Sstevestatic char const copyright[] = 331556Srgrimes"@(#) Copyright (c) 1988, 1993\n\ 341556Srgrimes The Regents of the University of California. All rights reserved.\n"; 351556Srgrimes#endif /* not lint */ 361556Srgrimes 371556Srgrimes#ifndef lint 3836012Scharnierstatic char sccsid[] = "@(#)hostname.c 8.1 (Berkeley) 5/31/93"; 39114433Sobrien#endif /* not lint */ 4036012Scharnier#endif 4199109Sobrien#include <sys/cdefs.h> 4299109Sobrien__FBSDID("$FreeBSD: head/bin/hostname/hostname.c 250037 2013-04-28 22:52:43Z eadler $"); 431556Srgrimes 441556Srgrimes#include <sys/param.h> 451556Srgrimes 461556Srgrimes#include <err.h> 471556Srgrimes#include <stdio.h> 481556Srgrimes#include <stdlib.h> 491556Srgrimes#include <string.h> 501556Srgrimes#include <unistd.h> 511556Srgrimes 52250037Seadlerstatic void usage(void) __dead2; 5320415Ssteve 541556Srgrimesint 5590110Simpmain(int argc, char *argv[]) 561556Srgrimes{ 571556Srgrimes int ch, sflag; 581556Srgrimes char *p, hostname[MAXHOSTNAMELEN]; 591556Srgrimes 601556Srgrimes sflag = 0; 61165006Skientzle while ((ch = getopt(argc, argv, "fs")) != -1) 621556Srgrimes switch (ch) { 63165004Skientzle case 'f': 64165006Skientzle /* 65165006Skientzle * On Linux, "hostname -f" prints FQDN. 66165006Skientzle * BSD "hostname" always prints FQDN by 67165006Skientzle * default, so we accept but ignore -f. 68165006Skientzle */ 69165004Skientzle break; 701556Srgrimes case 's': 711556Srgrimes sflag = 1; 721556Srgrimes break; 731556Srgrimes case '?': 741556Srgrimes default: 7520415Ssteve usage(); 761556Srgrimes } 771556Srgrimes argc -= optind; 781556Srgrimes argv += optind; 791556Srgrimes 8020415Ssteve if (argc > 1) 8120415Ssteve usage(); 8220415Ssteve 831556Srgrimes if (*argv) { 8476877Skris if (sethostname(*argv, (int)strlen(*argv))) 851556Srgrimes err(1, "sethostname"); 861556Srgrimes } else { 8776877Skris if (gethostname(hostname, (int)sizeof(hostname))) 881556Srgrimes err(1, "gethostname"); 8991084Smarkm if (sflag) { 9091084Smarkm p = strchr(hostname, '.'); 9191084Smarkm if (p != NULL) 9291084Smarkm *p = '\0'; 9391084Smarkm } 941556Srgrimes (void)printf("%s\n", hostname); 951556Srgrimes } 961556Srgrimes exit(0); 971556Srgrimes} 9820415Ssteve 99194795Sdelphijstatic void 10090110Simpusage(void) 10120415Ssteve{ 10220415Ssteve 103165006Skientzle (void)fprintf(stderr, "usage: hostname [-fs] [name-of-host]\n"); 10420415Ssteve exit(1); 10520415Ssteve} 106