103 lines
2.1 KiB
C
103 lines
2.1 KiB
C
/* 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;
|
|
}
|