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