1 /* vi: set sw=4 ts=4: */
3 * Mini hostname implementation for busybox
5 * Copyright (C) 1999 by Randolph Chung <tausq@debian.org>
7 * Adjusted by Erik Andersen <andersen@codepoet.org> to remove
8 * use of long options and GNU getopt. Improved the usage info.
10 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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"
23 //usage:#define hostname_example_usage
24 //usage: "$ hostname\n"
27 //usage:#define dnsdomainname_trivial_usage NOUSAGE_STR
28 //usage:#define dnsdomainname_full_usage ""
32 static void do_sethostname(char *s, int isfile)
37 parser_t *parser = config_open2(s, xfopen_for_read);
38 while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
41 if (ENABLE_FEATURE_CLEAN_UP)
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");
50 /* Manpage circa 2009:
52 * hostname [-v] [-a] [--alias] [-d] [--domain] [-f] [--fqdn] [--long]
53 * [-i] [--ip-address] [-s] [--short] [-y] [--yp] [--nis]
55 * hostname [-v] [-F filename] [--file filename] / [hostname]
57 * domainname [-v] [-F filename] [--file filename] / [name]
58 * { bbox: not supported }
60 * nodename [-v] [-F filename] [--file filename] / [name]
61 * { bbox: not supported }
64 * { bbox: supported: Linux kernel build needs this }
66 * { bbox: not supported }
68 * { bbox: not supported }
71 * Display the alias name of the host (if used).
72 * { bbox: not supported }
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
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
85 * Display the IP address(es) of the host.
87 * Display the short host name. This is the host name cut at the
90 * Be verbose and tell what's going on.
91 * { bbox: supported but ignored }
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 }
97 * Read the host name from the specified file. Comments (lines
98 * starting with a `#') are ignored.
100 int hostname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
101 int hostname_main(int argc UNUSED_PARAM, char **argv)
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"
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);
133 buf = safe_gethostname();
134 if (applet_name[0] == 'd') /* dnsdomainname? */
137 if (opts & OPT_dfis) {
138 /* Cases when we need full hostname (or its part) */
142 hp = xgethostbyname(buf);
143 p = strchrnul(hp->h_name, '.');
146 } else if (opts & OPT_s) {
149 } else if (opts & OPT_d) {
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("%s ", inet_ntoa(**h_addr_list));
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);
169 /* Just print the current hostname */
173 if (ENABLE_FEATURE_CLEAN_UP)