blob: 4da5b402f7fa95b1cfd5f3b57e3ba922139d725d
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 | |
32 | static 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("%s", 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 | */ |
100 | int hostname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
101 | int 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_dfi = 0x7, |
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_dfi) { |
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_s) { |
163 | strchrnul(buf, '.')[0] = '\0'; |
164 | puts(buf); |
165 | } else if (opts & OPT_F) { |
166 | /* Set the hostname */ |
167 | do_sethostname(hostname_str, 1); |
168 | } else if (argv[0]) { |
169 | /* Set the hostname */ |
170 | do_sethostname(argv[0], 0); |
171 | } else { |
172 | /* Just print the current hostname */ |
173 | puts(buf); |
174 | } |
175 | |
176 | if (ENABLE_FEATURE_CLEAN_UP) |
177 | free(buf); |
178 | return EXIT_SUCCESS; |
179 | } |
180 |