| /* vi: set sw=4 ts=4: */ |
| /* |
| * $Id: hostname.c,v 1.23 2001/02/01 16:49:29 kraai 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> |
| |
| 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) |
| usage(hostname_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) { |
| usage(hostname_usage); |
| } |
| filename = *(++argv); |
| break; |
| case '-': |
| if (strcmp(++(*argv), "file") || --argc ==0 ) { |
| usage(hostname_usage); |
| } |
| filename = *(++argv); |
| break; |
| default: |
| usage(hostname_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); |
| } |