3d61b10595
- Switched to getopt argument parsing
- Added -f option to get fully qualified domain name
- Fixed the -s (short) and -d (domain) options, which were not
doing a gethostbyname lookup to get the FQDN before trying to
separate the local and domain portions of the hostname.
- Fixed probem with 'agressive setting' of the hostname...the
previous busybox version would try to set the hostname if called
with a non-option argument, or the -F option, even if another
option (like -i or -s) was given. This behavior does not match
the net-tools hostname, which does not attempt to set anything if
given a 'display' option, regardless of the presence/absence of
the -F option or additional command line arguments.
- When using a file to set the hostname, behavior now matches
net-tools version...previous busybox version did not handle
comments, and simply grabbed the first line from the file.
131 lines
2.9 KiB
C
131 lines
2.9 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* $Id: hostname.c,v 1.32 2001/10/31 09:59:57 andersen Exp $
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* Mini hostname implementation for busybox
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*
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* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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*
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* adjusted by Erik Andersen <andersee@debian.org> to remove
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* use of long options and GNU getopt. Improved the usage info.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*/
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#include <errno.h>
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#include <arpa/inet.h>
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#include <netdb.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include "busybox.h"
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extern char *optarg; /* in unistd.h */
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extern int optind, opterr, optopt; /* in unistd.h */
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static void do_sethostname(char *s, int isfile)
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{
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FILE *f;
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char buf[255];
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if (!s)
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return;
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if (!isfile) {
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if (sethostname(s, strlen(s)) < 0) {
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if (errno == EPERM)
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error_msg_and_die("you must be root to change the hostname");
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else
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perror_msg_and_die("sethostname");
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}
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} else {
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f = xfopen(s, "r");
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while (fgets(buf, 255, f) != NULL) {
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if (buf[0] =='#') {
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continue;
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}
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chomp(buf);
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do_sethostname(buf, 0);
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}
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#ifdef CONFIG_FEATURE_CLEAN_UP
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fclose(f);
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#endif
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}
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}
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int hostname_main(int argc, char **argv)
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{
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int opt;
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int type = 0;
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struct hostent *hp;
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char *filename = NULL;
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char buf[255];
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char *p = NULL;
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if (argc < 1)
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show_usage();
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while ((opt = getopt(argc, argv, "dfisF:")) > 0) {
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switch (opt) {
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case 'd':
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case 'f':
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case 'i':
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case 's':
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type = opt;
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break;
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case 'F':
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filename = optarg;
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break;
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default:
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show_usage();
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}
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}
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/* Output in desired format */
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if (type != 0) {
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gethostname(buf, 255);
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hp = xgethostbyname(buf);
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p = strchr(hp->h_name, '.');
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if (type == 'f') {
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puts(hp->h_name);
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} else if (type == 's') {
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if (p != NULL) {
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*p = 0;
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}
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puts(buf);
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} else if (type == 'd') {
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puts(p ? p + 1 : "");
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} else if (type == 'i') {
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while (hp->h_addr_list[0]) {
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printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++)));
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}
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printf("\n");
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}
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}
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/* Set the hostname */
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else if (filename != NULL) {
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do_sethostname(filename, 1);
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} else if (optind < argc) {
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do_sethostname(argv[optind], 0);
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}
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/* Or if all else fails,
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* just print the current hostname */
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else {
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gethostname(buf, 255);
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puts(buf);
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}
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return(0);
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}
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