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/* vi: set sw=4 ts=4: */
/*
* $Id: hostname.c,v 1.26 2001/03/09 21:24:12 andersen Exp $
* Mini hostname implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
*
* adjusted by Erik Andersen <andersee@debian.org> to remove
* use of long options and GNU getopt. Improved the usage info.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "busybox.h"
#include <errno.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>
static void do_sethostname(char *s, int isfile)
{
FILE *f;
char buf[255];
if (!s)
return;
if (!isfile) {
if (sethostname(s, strlen(s)) < 0) {
if (errno == EPERM)
error_msg_and_die("you must be root to change the hostname");
else
perror_msg_and_die("sethostname");
}
} else {
f = xfopen(s, "r");
fgets(buf, 255, f);
fclose(f);
chomp(buf);
if (sethostname(buf, strlen(buf)) < 0)
perror_msg_and_die("sethostname");
}
}
int hostname_main(int argc, char **argv)
{
int opt_short = 0;
int opt_domain = 0;
int opt_ip = 0;
struct hostent *h;
char *filename = NULL;
char buf[255];
char *s = NULL;
if (argc < 1)
show_usage();
while (--argc > 0 && **(++argv) == '-') {
while (*(++(*argv))) {
switch (**argv) {
case 's':
opt_short = 1;
break;
case 'i':
opt_ip = 1;
break;
case 'd':
opt_domain = 1;
break;
case 'F':
if (--argc == 0) {
show_usage();
}
filename = *(++argv);
break;
case '-':
if (strcmp(++(*argv), "file") || --argc ==0 ) {
show_usage();
}
filename = *(++argv);
break;
default:
show_usage();
}
if (filename != NULL)
break;
}
}
if (argc >= 1) {
do_sethostname(*argv, 0);
} else if (filename != NULL) {
do_sethostname(filename, 1);
} else {
gethostname(buf, 255);
if (opt_short) {
s = strchr(buf, '.');
if (!s)
s = buf;
*s = 0;
printf("%s\n", buf);
} else if (opt_domain) {
s = strchr(buf, '.');
printf("%s\n", (s ? s + 1 : ""));
} else if (opt_ip) {
h = gethostbyname(buf);
if (!h) {
printf("Host not found\n");
exit(1);
}
printf("%s\n", inet_ntoa(*(struct in_addr *) (h->h_addr)));
} else {
printf("%s\n", buf);
}
}
return(0);
}
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