139 lines
3.4 KiB
C
139 lines
3.4 KiB
C
/*
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* $Id: hostname.c,v 1.5 1999/12/09 06:11:36 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 "internal.h"
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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 <stdio.h>
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static const char* hostname_usage =
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"hostname [OPTION] {hostname | -F file}\n\n"
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"Get or set the hostname or DNS domain name. If a hostname is given\n"
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"(or a file with the -F parameter), the host name will be set.\n\n"
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"Options:\n"
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"\t-s\t\tShort\n"
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"\t-i\t\tAddresses for the hostname\n"
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"\t-d\t\tDNS domain name\n"
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"\t-F FILE\t\tUse the contents of FILE to specify the hostname\n";
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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) 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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fprintf(stderr, "hostname: you must be root to change the hostname\n");
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else
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perror("sethostname");
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exit(1);
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}
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} else {
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if ((f = fopen(s, "r")) == NULL) {
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perror(s);
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exit(1);
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} else {
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fgets(buf, 255, f);
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fclose(f);
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if (buf[strlen(buf)-1] == '\n') buf[strlen(buf)-1] = 0;
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if (sethostname(buf, strlen(buf)) < 0) {
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perror("sethostname");
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exit(1);
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}
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}
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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_short = 0;
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int opt_domain = 0;
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int opt_ip = 0;
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struct hostent *h;
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char *filename = NULL;
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char buf[255];
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char *s = NULL;
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if (argc < 1) usage(hostname_usage);
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while (--argc > 0 && **(++argv) == '-') {
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while (*(++(*argv))) {
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switch (**argv) {
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case 's':
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opt_short = 1;
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break;
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case 'i':
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opt_ip = 1;
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break;
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case 'd':
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opt_domain = 1;
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break;
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case 'F':
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filename = optarg;
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if (--argc == 0) {
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usage(hostname_usage);
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}
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filename = *(++argv);
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break;
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default:
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usage(hostname_usage);
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}
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if (filename!=NULL)
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break;
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}
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}
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if (argc >= 1) {
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do_sethostname(*argv, 0);
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} else if (filename!=NULL) {
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do_sethostname(filename, 1);
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} else {
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gethostname(buf, 255);
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if (opt_short) {
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s = strchr(buf, '.');
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if (!s) s = buf; *s = 0;
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printf("%s\n", buf);
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} else if (opt_domain) {
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s = strchr(buf, '.');
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printf("%s\n", (s ? s+1 : ""));
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} else if (opt_ip) {
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h = gethostbyname(buf);
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if (!h) {
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printf("Host not found\n");
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exit(1);
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}
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printf("%s\n", inet_ntoa(*(struct in_addr *)(h->h_addr)));
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} else {
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printf("%s\n", buf);
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}
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}
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exit( 0);
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}
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