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/* vi: set sw=4 ts=4: */
/*
* $Id: hostname.c,v 1.36 2003/07/14 21:21:01 andersen Exp $
* Mini hostname implementation for busybox
*
* Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
*
* adjusted by Erik Andersen <andersen@codepoet.org> to remove
* use of long options and GNU getopt. Improved the usage info.
*
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "busybox.h"
static void do_sethostname(char *s, int isfile)
{
FILE *f;
char buf[256];
if (!s)
return;
if (!isfile) {
if (sethostname(s, strlen(s)) < 0) {
if (errno == EPERM)
bb_error_msg_and_die("you must be root to change the hostname");
else
bb_perror_msg_and_die("sethostname");
}
} else {
f = xfopen(s, "r");
while (fgets(buf, sizeof(buf), f) != NULL) {
if (buf[0] =='#') {
continue;
}
chomp(buf);
do_sethostname(buf, 0);
}
#ifdef CONFIG_FEATURE_CLEAN_UP
fclose(f);
#endif
}
}
int hostname_main(int argc, char **argv)
{
enum {
OPT_d = 0x1,
OPT_f = 0x2,
OPT_i = 0x4,
OPT_s = 0x8,
OPT_dfis = 0xf,
};
char buf[256];
unsigned long opt;
char *hostname_str = NULL;
if (argc < 1)
bb_show_usage();
opt = bb_getopt_ulflags(argc, argv, "dfisF:", &hostname_str);
/* Output in desired format */
if (opt & OPT_dfis) {
struct hostent *hp;
char *p;
gethostname(buf, sizeof(buf));
hp = xgethostbyname(buf);
p = strchr(hp->h_name, '.');
if (opt & OPT_f) {
puts(hp->h_name);
} else if (opt & OPT_s) {
if (p != NULL) {
*p = 0;
}
puts(hp->h_name);
} else if (opt & OPT_d) {
if (p) puts(p + 1);
} else if (opt & OPT_i) {
while (hp->h_addr_list[0]) {
printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++)));
}
puts("");
}
}
/* Set the hostname */
else if (hostname_str != NULL) {
do_sethostname(hostname_str, 1);
} else if (optind < argc) {
do_sethostname(argv[optind], 0);
}
/* Or if all else fails,
* just print the current hostname */
else {
gethostname(buf, sizeof(buf));
puts(buf);
}
return 0;
}
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