121 lines
2.4 KiB
C
121 lines
2.4 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* $Id: hostname.c,v 1.36 2003/07/14 21:21:01 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 <andersen@codepoet.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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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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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 <string.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <getopt.h>
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#include "busybox.h"
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extern char *optarg; /* in unistd.h */
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extern int optind, opterr, optopt; /* in unistd.h */
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static 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)
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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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bb_error_msg_and_die("you must be root to change the hostname");
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else
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bb_perror_msg_and_die("sethostname");
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}
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} else {
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f = bb_xfopen(s, "r");
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while (fgets(buf, 255, f) != NULL) {
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if (buf[0] =='#') {
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continue;
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}
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chomp(buf);
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do_sethostname(buf, 0);
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}
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#ifdef CONFIG_FEATURE_CLEAN_UP
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fclose(f);
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#endif
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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;
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int type = 0;
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struct hostent *hp;
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char *filename = NULL;
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char buf[255];
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char *p = NULL;
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if (argc < 1)
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bb_show_usage();
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while ((opt = getopt(argc, argv, "dfisF:")) > 0) {
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switch (opt) {
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case 'd':
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case 'f':
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case 'i':
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case 's':
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type = opt;
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break;
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case 'F':
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filename = optarg;
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break;
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default:
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bb_show_usage();
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}
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}
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/* Output in desired format */
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if (type != 0) {
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gethostname(buf, 255);
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hp = xgethostbyname(buf);
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p = strchr(hp->h_name, '.');
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if (type == 'f') {
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puts(hp->h_name);
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} else if (type == 's') {
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if (p != NULL) {
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*p = 0;
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}
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puts(hp->h_name);
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} else if (type == 'd') {
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if (p) puts(p + 1);
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} else if (type == 'i') {
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while (hp->h_addr_list[0]) {
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printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++)));
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}
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printf("\n");
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}
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}
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/* Set the hostname */
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else if (filename != NULL) {
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do_sethostname(filename, 1);
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} else if (optind < argc) {
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do_sethostname(argv[optind], 0);
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}
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/* Or if all else fails,
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* just print the current hostname */
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else {
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gethostname(buf, 255);
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puts(buf);
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}
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return(0);
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}
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