source: branches/3.2/mindi-busybox/networking/hostname.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 6 years ago
  • Update mindi-busybox to 1.21.1
File size: 5.0 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * Mini hostname implementation for busybox
4 *
5 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
6 *
7 * Adjusted by Erik Andersen <andersen@codepoet.org> to remove
8 * use of long options and GNU getopt.  Improved the usage info.
9 *
10 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 */
12
13//usage:#define hostname_trivial_usage
14//usage:       "[OPTIONS] [HOSTNAME | -F FILE]"
15//usage:#define hostname_full_usage "\n\n"
16//usage:       "Get or set hostname or DNS domain name\n"
17//usage:     "\n    -s  Short"
18//usage:     "\n    -i  Addresses for the hostname"
19//usage:     "\n    -d  DNS domain name"
20//usage:     "\n    -f  Fully qualified domain name"
21//usage:     "\n    -F FILE Use FILE's content as hostname"
22//usage:
23//usage:#define hostname_example_usage
24//usage:       "$ hostname\n"
25//usage:       "sage\n"
26//usage:
27//usage:#define dnsdomainname_trivial_usage NOUSAGE_STR
28//usage:#define dnsdomainname_full_usage ""
29
30#include "libbb.h"
31
32static void do_sethostname(char *s, int isfile)
33{
34//  if (!s)
35//      return;
36    if (isfile) {
37        parser_t *parser = config_open2(s, xfopen_for_read);
38        while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
39            do_sethostname(s, 0);
40        }
41        if (ENABLE_FEATURE_CLEAN_UP)
42            config_close(parser);
43    } else if (sethostname(s, strlen(s))) {
44//      if (errno == EPERM)
45//          bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
46        bb_perror_msg_and_die("sethostname");
47    }
48}
49
50/* Manpage circa 2009:
51 *
52 * hostname [-v] [-a] [--alias] [-d] [--domain] [-f] [--fqdn] [--long]
53 *      [-i] [--ip-address] [-s] [--short] [-y] [--yp] [--nis]
54 *
55 * hostname [-v] [-F filename] [--file filename] / [hostname]
56 *
57 * domainname [-v] [-F filename] [--file filename]  / [name]
58 *  { bbox: not supported }
59 *
60 * nodename [-v] [-F filename] [--file filename] / [name]
61 *  { bbox: not supported }
62 *
63 * dnsdomainname [-v]
64 *  { bbox: supported: Linux kernel build needs this }
65 * nisdomainname [-v]
66 *  { bbox: not supported }
67 * ypdomainname [-v]
68 *  { bbox: not supported }
69 *
70 * -a, --alias
71 *  Display the alias name of the host (if used).
72 *  { bbox: not supported }
73 * -d, --domain
74 *  Display the name of the DNS domain. Don't use the command
75 *  domainname to get the DNS domain name because it will show the
76 *  NIS domain name and not the DNS domain name. Use dnsdomainname
77 *  instead.
78 * -f, --fqdn, --long
79 *  Display the FQDN (Fully Qualified Domain Name). A FQDN consists
80 *  of a short host name and the DNS domain name. Unless you are
81 *  using bind or NIS for host lookups you can change the FQDN and
82 *  the DNS domain name (which is part of the FQDN) in the
83 *  /etc/hosts file.
84 * -i, --ip-address
85 *  Display the IP address(es) of the host.
86 * -s, --short
87 *  Display the short host name. This is the host name cut at the
88 *  first dot.
89 * -v, --verbose
90 *  Be verbose and tell what's going on.
91 *  { bbox: supported but ignored }
92 * -y, --yp, --nis
93 *  Display the NIS domain name. If a parameter is given (or --file
94 *  name ) then root can also set a new NIS domain.
95 *  { bbox: not supported }
96 * -F, --file filename
97 *  Read the host name from the specified file. Comments (lines
98 *  starting with a `#') are ignored.
99 */
100int hostname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
101int hostname_main(int argc UNUSED_PARAM, char **argv)
102{
103    enum {
104        OPT_d = 0x1,
105        OPT_f = 0x2,
106        OPT_i = 0x4,
107        OPT_s = 0x8,
108        OPT_F = 0x10,
109        OPT_dfis = 0xf,
110    };
111
112    unsigned opts;
113    char *buf;
114    char *hostname_str;
115
116#if ENABLE_LONG_OPTS
117    applet_long_options =
118        "domain\0"     No_argument "d"
119        "fqdn\0"       No_argument "f"
120    //Enable if seen in active use in some distro:
121    //  "long\0"       No_argument "f"
122    //  "ip-address\0" No_argument "i"
123    //  "short\0"      No_argument "s"
124    //  "verbose\0"    No_argument "v"
125        "file\0"       No_argument "F"
126        ;
127
128#endif
129    /* dnsdomainname from net-tools 1.60, hostname 1.100 (2001-04-14),
130     * supports hostname's options too (not just -v as manpage says) */
131    opts = getopt32(argv, "dfisF:v", &hostname_str);
132    argv += optind;
133    buf = safe_gethostname();
134    if (applet_name[0] == 'd') /* dnsdomainname? */
135        opts = OPT_d;
136
137    if (opts & OPT_dfis) {
138        /* Cases when we need full hostname (or its part) */
139        struct hostent *hp;
140        char *p;
141
142        hp = xgethostbyname(buf);
143        p = strchrnul(hp->h_name, '.');
144        if (opts & OPT_f) {
145            puts(hp->h_name);
146        } else if (opts & OPT_s) {
147            *p = '\0';
148            puts(hp->h_name);
149        } else if (opts & OPT_d) {
150            if (*p)
151                puts(p + 1);
152        } else /*if (opts & OPT_i)*/ {
153            if (hp->h_length == sizeof(struct in_addr)) {
154                struct in_addr **h_addr_list = (struct in_addr **)hp->h_addr_list;
155                while (*h_addr_list) {
156                    printf(h_addr_list[1] ? "%s " : "%s", inet_ntoa(**h_addr_list));
157                    h_addr_list++;
158                }
159                bb_putchar('\n');
160            }
161        }
162    } else if (opts & OPT_F) {
163        /* Set the hostname */
164        do_sethostname(hostname_str, 1);
165    } else if (argv[0]) {
166        /* Set the hostname */
167        do_sethostname(argv[0], 0);
168    } else {
169        /* Just print the current hostname */
170        puts(buf);
171    }
172
173    if (ENABLE_FEATURE_CLEAN_UP)
174        free(buf);
175    return EXIT_SUCCESS;
176}
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