128 lines
2.8 KiB
C
128 lines
2.8 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* $Id: hostname.c,v 1.29 2001/06/23 13:49:14 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 <errno.h>
|
|
#include <arpa/inet.h>
|
|
#include <netdb.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include "busybox.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;
|
|
puts(buf);
|
|
} else if (opt_domain) {
|
|
s = strchr(buf, '.');
|
|
puts(s ? s + 1 : "");
|
|
} else if (opt_ip) {
|
|
h = xgethostbyname(buf);
|
|
puts(inet_ntoa(*(struct in_addr *) (h->h_addr)));
|
|
} else {
|
|
puts(buf);
|
|
}
|
|
}
|
|
return(0);
|
|
}
|