1 | package Sys::Hostname;
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2 |
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3 | use strict;
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4 |
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5 | use Carp;
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6 |
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7 | require Exporter;
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8 | require AutoLoader;
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9 |
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10 | our @ISA = qw/ Exporter AutoLoader /;
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11 | our @EXPORT = qw/ hostname /;
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12 |
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13 | our $VERSION;
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14 |
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15 | our $host;
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16 |
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17 | BEGIN {
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18 | $VERSION = '1.11';
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19 | {
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20 | local $SIG{__DIE__};
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21 | eval {
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22 | require XSLoader;
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23 | XSLoader::load('Sys::Hostname', $VERSION);
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24 | };
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25 | warn $@ if $@;
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26 | }
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27 | }
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28 |
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29 |
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30 | sub hostname {
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31 |
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32 | # method 1 - we already know it
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33 | return $host if defined $host;
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34 |
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35 | # method 1' - try to ask the system
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36 | $host = ghname() if defined &ghname;
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37 | return $host if defined $host;
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38 |
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39 | if ($^O eq 'VMS') {
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40 |
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41 | # method 2 - no sockets ==> return DECnet node name
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42 | eval { local $SIG{__DIE__}; $host = (gethostbyname('me'))[0] };
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43 | if ($@) { return $host = $ENV{'SYS$NODE'}; }
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44 |
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45 | # method 3 - has someone else done the job already? It's common for the
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46 | # TCP/IP stack to advertise the hostname via a logical name. (Are
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47 | # there any other logicals which TCP/IP stacks use for the host name?)
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48 | $host = $ENV{'ARPANET_HOST_NAME'} || $ENV{'INTERNET_HOST_NAME'} ||
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49 | $ENV{'MULTINET_HOST_NAME'} || $ENV{'UCX$INET_HOST'} ||
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50 | $ENV{'TCPWARE_DOMAINNAME'} || $ENV{'NEWS_ADDRESS'};
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51 | return $host if $host;
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52 |
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53 | # method 4 - does hostname happen to work?
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54 | my($rslt) = `hostname`;
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55 | if ($rslt !~ /IVVERB/) { ($host) = $rslt =~ /^(\S+)/; }
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56 | return $host if $host;
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57 |
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58 | # rats!
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59 | $host = '';
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60 | croak "Cannot get host name of local machine";
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61 |
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62 | }
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63 | elsif ($^O eq 'MSWin32') {
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64 | ($host) = gethostbyname('localhost');
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65 | chomp($host = `hostname 2> NUL`) unless defined $host;
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66 | return $host;
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67 | }
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68 | elsif ($^O eq 'epoc') {
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69 | $host = 'localhost';
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70 | return $host;
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71 | }
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72 | else { # Unix
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73 | # is anyone going to make it here?
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74 |
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75 | local $ENV{PATH} = '/usr/bin:/bin:/usr/sbin:/sbin'; # Paranoia.
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76 |
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77 | # method 2 - syscall is preferred since it avoids tainting problems
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78 | # XXX: is it such a good idea to return hostname untainted?
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79 | eval {
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80 | local $SIG{__DIE__};
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81 | require "syscall.ph";
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82 | $host = "\0" x 65; ## preload scalar
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83 | syscall(&SYS_gethostname, $host, 65) == 0;
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84 | }
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85 |
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86 | # method 2a - syscall using systeminfo instead of gethostname
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87 | # -- needed on systems like Solaris
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88 | || eval {
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89 | local $SIG{__DIE__};
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90 | require "sys/syscall.ph";
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91 | require "sys/systeminfo.ph";
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92 | $host = "\0" x 65; ## preload scalar
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93 | syscall(&SYS_systeminfo, &SI_HOSTNAME, $host, 65) != -1;
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94 | }
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95 |
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96 | # method 3 - trusty old hostname command
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97 | || eval {
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98 | local $SIG{__DIE__};
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99 | local $SIG{CHLD};
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100 | $host = `(hostname) 2>/dev/null`; # bsdish
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101 | }
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102 |
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103 | # method 4 - use POSIX::uname(), which strictly can't be expected to be
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104 | # correct
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105 | || eval {
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106 | local $SIG{__DIE__};
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107 | require POSIX;
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108 | $host = (POSIX::uname())[1];
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109 | }
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110 |
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111 | # method 5 - sysV uname command (may truncate)
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112 | || eval {
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113 | local $SIG{__DIE__};
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114 | $host = `uname -n 2>/dev/null`; ## sysVish
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115 | }
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116 |
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117 | # method 6 - Apollo pre-SR10
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118 | || eval {
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119 | local $SIG{__DIE__};
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120 | my($a,$b,$c,$d);
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121 | ($host,$a,$b,$c,$d)=split(/[:\. ]/,`/com/host`,6);
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122 | }
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123 |
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124 | # bummer
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125 | || croak "Cannot get host name of local machine";
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126 |
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127 | # remove garbage
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128 | $host =~ tr/\0\r\n//d;
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129 | $host;
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130 | }
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131 | }
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132 |
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133 | 1;
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134 |
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135 | __END__
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136 |
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137 | =head1 NAME
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138 |
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139 | Sys::Hostname - Try every conceivable way to get hostname
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140 |
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141 | =head1 SYNOPSIS
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142 |
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143 | use Sys::Hostname;
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144 | $host = hostname;
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145 |
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146 | =head1 DESCRIPTION
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147 |
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148 | Attempts several methods of getting the system hostname and
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149 | then caches the result. It tries the first available of the C
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150 | library's gethostname(), C<`$Config{aphostname}`>, uname(2),
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151 | C<syscall(SYS_gethostname)>, C<`hostname`>, C<`uname -n`>,
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152 | and the file F</com/host>. If all that fails it C<croak>s.
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153 |
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154 | All NULs, returns, and newlines are removed from the result.
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155 |
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156 | =head1 AUTHOR
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157 |
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158 | David Sundstrom E<lt>F<[email protected]>E<gt>
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159 |
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160 | Texas Instruments
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161 |
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162 | XS code added by Greg Bacon E<lt>F<[email protected]>E<gt>
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163 |
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164 | =cut
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165 |
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