blob: 06d91f2d017e8aa9b68a6d95fbdf45b251c27f32
| 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 | //config:config HOSTNAME |
| 14 | //config: bool "hostname" |
| 15 | //config: default y |
| 16 | //config: help |
| 17 | //config: Show or set the system's host name. |
| 18 | //config: |
| 19 | //config:config DNSDOMAINNAME |
| 20 | //config: bool "dnsdomainname" |
| 21 | //config: default y |
| 22 | //config: help |
| 23 | //config: Alias to "hostname -d". |
| 24 | |
| 25 | //applet:IF_DNSDOMAINNAME(APPLET_ODDNAME(dnsdomainname, hostname, BB_DIR_BIN, BB_SUID_DROP, dnsdomainname)) |
| 26 | //applet:IF_HOSTNAME(APPLET(hostname, BB_DIR_BIN, BB_SUID_DROP)) |
| 27 | |
| 28 | //kbuild: lib-$(CONFIG_HOSTNAME) += hostname.o |
| 29 | //kbuild: lib-$(CONFIG_DNSDOMAINNAME) += hostname.o |
| 30 | |
| 31 | //usage:#define hostname_trivial_usage |
| 32 | //usage: "[OPTIONS] [HOSTNAME | -F FILE]" |
| 33 | //usage:#define hostname_full_usage "\n\n" |
| 34 | //usage: "Get or set hostname or DNS domain name\n" |
| 35 | //usage: "\n -s Short" |
| 36 | //usage: "\n -i Addresses for the hostname" |
| 37 | //usage: "\n -d DNS domain name" |
| 38 | //usage: "\n -f Fully qualified domain name" |
| 39 | //usage: "\n -F FILE Use FILE's content as hostname" |
| 40 | //usage: |
| 41 | //usage:#define hostname_example_usage |
| 42 | //usage: "$ hostname\n" |
| 43 | //usage: "sage\n" |
| 44 | //usage: |
| 45 | //usage:#define dnsdomainname_trivial_usage NOUSAGE_STR |
| 46 | //usage:#define dnsdomainname_full_usage "" |
| 47 | |
| 48 | #include "libbb.h" |
| 49 | |
| 50 | static void do_sethostname(char *s, int isfile) |
| 51 | { |
| 52 | // if (!s) |
| 53 | // return; |
| 54 | if (isfile) { |
| 55 | parser_t *parser = config_open2(s, xfopen_for_read); |
| 56 | while (config_read(parser, &s, 1, 1, "# \t", PARSE_NORMAL & ~PARSE_GREEDY)) { |
| 57 | do_sethostname(s, 0); |
| 58 | } |
| 59 | if (ENABLE_FEATURE_CLEAN_UP) |
| 60 | config_close(parser); |
| 61 | } else if (sethostname(s, strlen(s))) { |
| 62 | // if (errno == EPERM) |
| 63 | // bb_error_msg_and_die("%s", bb_msg_perm_denied_are_you_root); |
| 64 | bb_perror_msg_and_die("sethostname"); |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | /* Manpage circa 2009: |
| 69 | * |
| 70 | * hostname [-v] [-a] [--alias] [-d] [--domain] [-f] [--fqdn] [--long] |
| 71 | * [-i] [--ip-address] [-s] [--short] [-y] [--yp] [--nis] |
| 72 | * |
| 73 | * hostname [-v] [-F filename] [--file filename] / [hostname] |
| 74 | * |
| 75 | * domainname [-v] [-F filename] [--file filename] / [name] |
| 76 | * { bbox: not supported } |
| 77 | * |
| 78 | * nodename [-v] [-F filename] [--file filename] / [name] |
| 79 | * { bbox: not supported } |
| 80 | * |
| 81 | * dnsdomainname [-v] |
| 82 | * { bbox: supported: Linux kernel build needs this } |
| 83 | * nisdomainname [-v] |
| 84 | * { bbox: not supported } |
| 85 | * ypdomainname [-v] |
| 86 | * { bbox: not supported } |
| 87 | * |
| 88 | * -a, --alias |
| 89 | * Display the alias name of the host (if used). |
| 90 | * { bbox: not supported } |
| 91 | * -d, --domain |
| 92 | * Display the name of the DNS domain. Don't use the command |
| 93 | * domainname to get the DNS domain name because it will show the |
| 94 | * NIS domain name and not the DNS domain name. Use dnsdomainname |
| 95 | * instead. |
| 96 | * -f, --fqdn, --long |
| 97 | * Display the FQDN (Fully Qualified Domain Name). A FQDN consists |
| 98 | * of a short host name and the DNS domain name. Unless you are |
| 99 | * using bind or NIS for host lookups you can change the FQDN and |
| 100 | * the DNS domain name (which is part of the FQDN) in the |
| 101 | * /etc/hosts file. |
| 102 | * -i, --ip-address |
| 103 | * Display the IP address(es) of the host. |
| 104 | * -s, --short |
| 105 | * Display the short host name. This is the host name cut at the |
| 106 | * first dot. |
| 107 | * -v, --verbose |
| 108 | * Be verbose and tell what's going on. |
| 109 | * { bbox: supported but ignored } |
| 110 | * -y, --yp, --nis |
| 111 | * Display the NIS domain name. If a parameter is given (or --file |
| 112 | * name ) then root can also set a new NIS domain. |
| 113 | * { bbox: not supported } |
| 114 | * -F, --file filename |
| 115 | * Read the host name from the specified file. Comments (lines |
| 116 | * starting with a `#') are ignored. |
| 117 | */ |
| 118 | int hostname_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| 119 | int hostname_main(int argc UNUSED_PARAM, char **argv) |
| 120 | { |
| 121 | enum { |
| 122 | OPT_d = 0x1, |
| 123 | OPT_f = 0x2, |
| 124 | OPT_i = 0x4, |
| 125 | OPT_s = 0x8, |
| 126 | OPT_F = 0x10, |
| 127 | OPT_dfi = 0x7, |
| 128 | }; |
| 129 | |
| 130 | unsigned opts; |
| 131 | char *buf; |
| 132 | char *hostname_str; |
| 133 | |
| 134 | #if ENABLE_LONG_OPTS |
| 135 | applet_long_options = |
| 136 | "domain\0" No_argument "d" |
| 137 | "fqdn\0" No_argument "f" |
| 138 | //Enable if seen in active use in some distro: |
| 139 | // "long\0" No_argument "f" |
| 140 | // "ip-address\0" No_argument "i" |
| 141 | // "short\0" No_argument "s" |
| 142 | // "verbose\0" No_argument "v" |
| 143 | "file\0" No_argument "F" |
| 144 | ; |
| 145 | |
| 146 | #endif |
| 147 | /* dnsdomainname from net-tools 1.60, hostname 1.100 (2001-04-14), |
| 148 | * supports hostname's options too (not just -v as manpage says) */ |
| 149 | opts = getopt32(argv, "dfisF:v", &hostname_str); |
| 150 | argv += optind; |
| 151 | buf = safe_gethostname(); |
| 152 | if (ENABLE_DNSDOMAINNAME) { |
| 153 | if (!ENABLE_HOSTNAME || applet_name[0] == 'd') { |
| 154 | /* dnsdomainname */ |
| 155 | opts = OPT_d; |
| 156 | } |
| 157 | } |
| 158 | |
| 159 | if (opts & OPT_dfi) { |
| 160 | /* Cases when we need full hostname (or its part) */ |
| 161 | struct hostent *hp; |
| 162 | char *p; |
| 163 | |
| 164 | hp = xgethostbyname(buf); |
| 165 | p = strchrnul(hp->h_name, '.'); |
| 166 | if (opts & OPT_f) { |
| 167 | puts(hp->h_name); |
| 168 | } else if (opts & OPT_s) { |
| 169 | *p = '\0'; |
| 170 | puts(hp->h_name); |
| 171 | } else if (opts & OPT_d) { |
| 172 | if (*p) |
| 173 | puts(p + 1); |
| 174 | } else /*if (opts & OPT_i)*/ { |
| 175 | if (hp->h_length == sizeof(struct in_addr)) { |
| 176 | struct in_addr **h_addr_list = (struct in_addr **)hp->h_addr_list; |
| 177 | while (*h_addr_list) { |
| 178 | printf(h_addr_list[1] ? "%s " : "%s", inet_ntoa(**h_addr_list)); |
| 179 | h_addr_list++; |
| 180 | } |
| 181 | bb_putchar('\n'); |
| 182 | } |
| 183 | } |
| 184 | } else if (opts & OPT_s) { |
| 185 | strchrnul(buf, '.')[0] = '\0'; |
| 186 | puts(buf); |
| 187 | } else if (opts & OPT_F) { |
| 188 | /* Set the hostname */ |
| 189 | do_sethostname(hostname_str, 1); |
| 190 | } else if (argv[0]) { |
| 191 | /* Set the hostname */ |
| 192 | do_sethostname(argv[0], 0); |
| 193 | } else { |
| 194 | /* Just print the current hostname */ |
| 195 | puts(buf); |
| 196 | } |
| 197 | |
| 198 | if (ENABLE_FEATURE_CLEAN_UP) |
| 199 | free(buf); |
| 200 | return EXIT_SUCCESS; |
| 201 | } |
| 202 |