source: trunk/mindi-busybox/networking/hostname.c @ 904

Last change on this file since 904 was 821, checked in by bruno, 13 years ago

Addition of busybox 1.2.1 as a mindi-busybox new package
This should avoid delivering binary files in mindi not built there (Fedora and Debian are quite serious about that)

File size: 2.9 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * $Id: hostname.c,v 1.36 2003/07/14 21:21:01 andersen Exp $
4 * Mini hostname implementation for busybox
5 *
6 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
7 *
8 * adjusted by Erik Andersen <andersen@codepoet.org> to remove
9 * use of long options and GNU getopt.  Improved the usage info.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or
14 * (at your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
19 * General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
24 */
25
26#include <errno.h>
27#include <arpa/inet.h>
28#include <netdb.h>
29#include <unistd.h>
30#include <string.h>
31#include <stdio.h>
32#include <stdlib.h>
33#include <getopt.h>
34#include "busybox.h"
35
36extern char *optarg; /* in unistd.h */
37extern int  optind, opterr, optopt; /* in unistd.h */
38
39static void do_sethostname(char *s, int isfile)
40{
41    FILE *f;
42    char buf[255];
43
44    if (!s)
45        return;
46    if (!isfile) {
47        if (sethostname(s, strlen(s)) < 0) {
48            if (errno == EPERM)
49                bb_error_msg_and_die("you must be root to change the hostname");
50            else
51                bb_perror_msg_and_die("sethostname");
52        }
53    } else {
54        f = bb_xfopen(s, "r");
55        while (fgets(buf, 255, f) != NULL) {
56            if (buf[0] =='#') {
57                continue;
58            }
59            chomp(buf);
60            do_sethostname(buf, 0);
61        }
62#ifdef CONFIG_FEATURE_CLEAN_UP
63        fclose(f);
64#endif
65    }
66}
67
68int hostname_main(int argc, char **argv)
69{
70    int opt;
71    int type = 0;
72    struct hostent *hp;
73    char *filename = NULL;
74    char buf[255];
75    char *p = NULL;
76
77    if (argc < 1)
78        bb_show_usage();
79
80    while ((opt = getopt(argc, argv, "dfisF:")) > 0) {
81        switch (opt) {
82        case 'd':
83        case 'f':
84        case 'i':
85        case 's':
86            type = opt;
87            break;
88        case 'F':
89            filename = optarg;
90            break;
91        default:
92            bb_show_usage();
93        }
94    }
95
96    /* Output in desired format */
97    if (type != 0) {
98        gethostname(buf, 255);
99        hp = xgethostbyname(buf);
100        p = strchr(hp->h_name, '.');
101        if (type == 'f') {
102            puts(hp->h_name);
103        } else if (type == 's') {
104            if (p != NULL) {
105                *p = 0;
106            }
107            puts(hp->h_name);
108        } else if (type == 'd') {
109            if (p) puts(p + 1);
110        } else if (type == 'i') {
111            while (hp->h_addr_list[0]) {
112                printf("%s ", inet_ntoa(*(struct in_addr *) (*hp->h_addr_list++)));
113            }
114            printf("\n");
115        }
116    }
117    /* Set the hostname */
118    else if (filename != NULL) {
119        do_sethostname(filename, 1);
120    } else if (optind < argc) {
121        do_sethostname(argv[optind], 0);
122    }
123    /* Or if all else fails,
124     * just print the current hostname */
125     else {
126        gethostname(buf, 255);
127        puts(buf);
128    }
129    return(0);
130}
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