[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * $Id: hostname.c,v 1.36 2003/07/14 21:21:01 andersen Exp $
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| 4 | * Mini hostname implementation for busybox
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| 5 | *
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| 6 | * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
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| 7 | *
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| 8 | * adjusted by Erik Andersen <andersen@codepoet.org> to remove
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| 9 | * use of long options and GNU getopt. Improved the usage info.
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| 10 | *
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| 11 | * This program is free software; you can redistribute it and/or modify
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| 12 | * it under the terms of the GNU General Public License as published by
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| 13 | * the Free Software Foundation; either version 2 of the License, or
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| 14 | * (at your option) any later version.
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| 15 | *
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| 16 | * This program is distributed in the hope that it will be useful,
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| 17 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 18 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 19 | * General Public License for more details.
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| 20 | *
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| 21 | * You should have received a copy of the GNU General Public License
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| 22 | * along with this program; if not, write to the Free Software
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| 23 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 24 | */
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| 25 |
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| 26 | #include <errno.h>
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| 27 | #include <arpa/inet.h>
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| 28 | #include <netdb.h>
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| 29 | #include <unistd.h>
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| 30 | #include <string.h>
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| 31 | #include <stdio.h>
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| 32 | #include <stdlib.h>
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| 33 | #include <getopt.h>
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| 34 | #include "busybox.h"
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| 35 |
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| 36 | extern char *optarg; /* in unistd.h */
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| 37 | extern int optind, opterr, optopt; /* in unistd.h */
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| 38 |
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| 39 | static void do_sethostname(char *s, int isfile)
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| 40 | {
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| 41 | FILE *f;
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| 42 | char buf[255];
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| 43 |
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| 44 | if (!s)
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| 45 | return;
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| 46 | if (!isfile) {
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| 47 | if (sethostname(s, strlen(s)) < 0) {
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| 48 | if (errno == EPERM)
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| 49 | bb_error_msg_and_die("you must be root to change the hostname");
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| 50 | else
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| 51 | bb_perror_msg_and_die("sethostname");
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| 52 | }
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| 53 | } else {
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| 54 | f = bb_xfopen(s, "r");
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| 55 | while (fgets(buf, 255, f) != NULL) {
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| 56 | if (buf[0] =='#') {
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| 57 | continue;
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| 58 | }
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| 59 | chomp(buf);
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| 60 | do_sethostname(buf, 0);
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| 61 | }
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| 62 | #ifdef CONFIG_FEATURE_CLEAN_UP
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| 63 | fclose(f);
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| 64 | #endif
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| 65 | }
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| 66 | }
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| 67 |
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| 68 | int hostname_main(int argc, char **argv)
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| 69 | {
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| 70 | int opt;
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| 71 | int type = 0;
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| 72 | struct hostent *hp;
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| 73 | char *filename = NULL;
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| 74 | char buf[255];
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| 75 | char *p = NULL;
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| 76 |
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| 77 | if (argc < 1)
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| 78 | bb_show_usage();
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| 79 |
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| 80 | while ((opt = getopt(argc, argv, "dfisF:")) > 0) {
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| 81 | switch (opt) {
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| 82 | case 'd':
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| 83 | case 'f':
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| 84 | case 'i':
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| 85 | case 's':
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| 86 | type = opt;
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| 87 | break;
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| 88 | case 'F':
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| 89 | filename = optarg;
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| 90 | break;
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| 91 | default:
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| 92 | bb_show_usage();
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| 93 | }
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| 94 | }
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| 95 |
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| 96 | /* Output in desired format */
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| 97 | if (type != 0) {
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| 98 | gethostname(buf, 255);
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| 99 | hp = xgethostbyname(buf);
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| 100 | p = strchr(hp->h_name, '.');
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| 101 | if (type == 'f') {
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| 102 | puts(hp->h_name);
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| 103 | } else if (type == 's') {
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| 104 | if (p != NULL) {
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| 105 | *p = 0;
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| 106 | }
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| 107 | puts(hp->h_name);
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| 108 | } else if (type == 'd') {
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| 109 | if (p) puts(p + 1);
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| 110 | } else if (type == 'i') {
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| 111 | while (hp->h_addr_list[0]) {
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| 112 | printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++)));
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| 113 | }
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| 114 | printf("\n");
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| 115 | }
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| 116 | }
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| 117 | /* Set the hostname */
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| 118 | else if (filename != NULL) {
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| 119 | do_sethostname(filename, 1);
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| 120 | } else if (optind < argc) {
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| 121 | do_sethostname(argv[optind], 0);
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| 122 | }
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| 123 | /* Or if all else fails,
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| 124 | * just print the current hostname */
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| 125 | else {
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| 126 | gethostname(buf, 255);
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| 127 | puts(buf);
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| 128 | }
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| 129 | return(0);
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| 130 | }
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