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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 /; |
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 | { |
20 | local $SIG{__DIE__}; |
21 | eval { |
22 | require XSLoader; |
23 | XSLoader::load('Sys::Hostname', $VERSION); |
24 | }; |
25 | warn $@ if $@; |
26 | } |
27 | } |
28 | |
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29 | |
30 | sub hostname { |
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31 | |
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32 | # method 1 - we already know it |
33 | return $host if defined $host; |
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 $host; |
38 | |
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39 | if ($^O eq 'VMS') { |
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40 | |
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 | |
45 | # method 3 - has someone else done the job already? It's common for the |
46 | # TCP/IP stack to advertise the hostname via a logical name. (Are |
47 | # there any other logicals which TCP/IP stacks use for the host name?) |
48 | $host = $ENV{'ARPANET_HOST_NAME'} || $ENV{'INTERNET_HOST_NAME'} || |
49 | $ENV{'MULTINET_HOST_NAME'} || $ENV{'UCX$INET_HOST'} || |
50 | $ENV{'TCPWARE_DOMAINNAME'} || $ENV{'NEWS_ADDRESS'}; |
51 | return $host if $host; |
52 | |
53 | # method 4 - does hostname happen to work? |
54 | my($rslt) = `hostname`; |
55 | if ($rslt !~ /IVVERB/) { ($host) = $rslt =~ /^(\S+)/; } |
56 | return $host if $host; |
57 | |
58 | # rats! |
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59 | $host = ''; |
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60 | croak "Cannot get host name of local machine"; |
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61 | |
62 | } |
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63 | elsif ($^O eq 'MSWin32') { |
64 | ($host) = gethostbyname('localhost'); |
65 | chomp($host = `hostname 2> NUL`) unless defined $host; |
66 | return $host; |
67 | } |
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68 | elsif ($^O eq 'epoc') { |
69 | $host = 'localhost'; |
70 | return $host; |
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. |
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 | } |
85 | |
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86 | # method 2a - syscall using systeminfo instead of gethostname |
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87 | # -- needed on systems like Solaris |
88 | || eval { |
89 | local $SIG{__DIE__}; |
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90 | require "sys/syscall.ph"; |
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 | } |
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 | } |
102 | |
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103 | # method 4 - use POSIX::uname(), which strictly can't be expected to be |
104 | # correct |
105 | || eval { |
106 | local $SIG{__DIE__}; |
107 | require POSIX; |
108 | $host = (POSIX::uname())[1]; |
109 | } |
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 | } |
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); |
122 | } |
123 | |
124 | # bummer |
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125 | || croak "Cannot get host name of local machine"; |
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126 | |
127 | # remove garbage |
128 | $host =~ tr/\0\r\n//d; |
129 | $host; |
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130 | } |
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131 | } |
132 | |
133 | 1; |
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134 | |
135 | __END__ |
136 | |
137 | =head1 NAME |
138 | |
139 | Sys::Hostname - Try every conceivable way to get hostname |
140 | |
141 | =head1 SYNOPSIS |
142 | |
143 | use Sys::Hostname; |
144 | $host = hostname; |
145 | |
146 | =head1 DESCRIPTION |
147 | |
148 | Attempts several methods of getting the system hostname and |
149 | then caches the result. It tries the first available of the C |
150 | library's gethostname(), C<`$Config{aphostname}`>, uname(2), |
151 | C<syscall(SYS_gethostname)>, C<`hostname`>, C<`uname -n`>, |
152 | and the file F</com/host>. If all that fails it C<croak>s. |
153 | |
154 | All NULs, returns, and newlines are removed from the result. |
155 | |
156 | =head1 AUTHOR |
157 | |
158 | David Sundstrom E<lt>F<sunds@asictest.sc.ti.com>E<gt> |
159 | |
160 | Texas Instruments |
161 | |
162 | XS code added by Greg Bacon E<lt>F<gbacon@cs.uah.edu>E<gt> |
163 | |
164 | =cut |
165 | |