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 tarball for details.
14 static void do_sethostname(char *s, int isfile)
19 parser_t *parser = config_open2(s, xfopen_for_read);
20 while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) {
23 if (ENABLE_FEATURE_CLEAN_UP)
25 } else if (sethostname(s, strlen(s))) {
26 // if (errno == EPERM)
27 // bb_error_msg_and_die(bb_msg_perm_denied_are_you_root);
28 bb_perror_msg_and_die("sethostname");
32 /* Manpage circa 2009:
34 * hostname [-v] [-a] [--alias] [-d] [--domain] [-f] [--fqdn] [--long]
35 * [-i] [--ip-address] [-s] [--short] [-y] [--yp] [--nis]
37 * hostname [-v] [-F filename] [--file filename] / [hostname]
39 * domainname [-v] [-F filename] [--file filename] / [name]
40 * { bbox: not supported }
42 * nodename [-v] [-F filename] [--file filename] / [name]
43 * { bbox: not supported }
46 * { bbox: supported: Linux kernel build needs this }
48 * { bbox: not supported }
50 * { bbox: not supported }
53 * Display the alias name of the host (if used).
54 * { bbox: not supported }
56 * Display the name of the DNS domain. Don't use the command
57 * domainname to get the DNS domain name because it will show the
58 * NIS domain name and not the DNS domain name. Use dnsdomainname
61 * Display the FQDN (Fully Qualified Domain Name). A FQDN consists
62 * of a short host name and the DNS domain name. Unless you are
63 * using bind or NIS for host lookups you can change the FQDN and
64 * the DNS domain name (which is part of the FQDN) in the
67 * Display the IP address(es) of the host.
69 * Display the short host name. This is the host name cut at the
72 * Be verbose and tell what's going on.
73 * { bbox: supported but ignored }
75 * Display the NIS domain name. If a parameter is given (or --file
76 * name ) then root can also set a new NIS domain.
77 * { bbox: not supported }
79 * Read the host name from the specified file. Comments (lines
80 * starting with a `#') are ignored.
82 int hostname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
83 int hostname_main(int argc UNUSED_PARAM, char **argv)
100 "domain\0" No_argument "d"
101 "fqdn\0" No_argument "f"
102 //Enable if seen in active use in some distro:
103 // "long\0" No_argument "f"
104 // "ip-address\0" No_argument "i"
105 // "short\0" No_argument "s"
106 // "verbose\0" No_argument "v"
107 "file\0" No_argument "F"
111 /* dnsdomainname from net-tools 1.60, hostname 1.100 (2001-04-14),
112 * supports hostname's options too (not just -v as manpage says) */
113 opts = getopt32(argv, "dfisF:v", &hostname_str);
115 buf = safe_gethostname();
116 if (applet_name[0] == 'd') /* dnsdomainname? */
119 if (opts & OPT_dfis) {
120 /* Cases when we need full hostname (or its part) */
124 hp = xgethostbyname(buf);
125 p = strchrnul(hp->h_name, '.');
128 } else if (opts & OPT_s) {
131 } else if (opts & OPT_d) {
134 } else /*if (opts & OPT_i)*/ {
135 if (hp->h_length == sizeof(struct in_addr)) {
136 struct in_addr **h_addr_list = (struct in_addr **)hp->h_addr_list;
137 while (*h_addr_list) {
138 printf("%s ", inet_ntoa(**h_addr_list));
144 } else if (opts & OPT_F) {
145 /* Set the hostname */
146 do_sethostname(hostname_str, 1);
147 } else if (argv[0]) {
148 /* Set the hostname */
149 do_sethostname(argv[0], 0);
151 /* Just print the current hostname */
155 if (ENABLE_FEATURE_CLEAN_UP)