Commit | Line | Data |
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920dae64 AT |
1 | package Sys::Hostname; |
2 | ||
3 | use strict; | |
4 | ||
5 | use Carp; | |
6 | ||
7 | require Exporter; | |
8 | require AutoLoader; | |
9 | ||
10 | our @ISA = qw/ Exporter AutoLoader /; | |
11 | our @EXPORT = qw/ hostname /; | |
12 | ||
13 | our $VERSION; | |
14 | ||
15 | our $host; | |
16 | ||
17 | BEGIN { | |
18 | $VERSION = '1.11'; | |
19 | { | |
20 | local $SIG{__DIE__}; | |
21 | eval { | |
22 | require XSLoader; | |
23 | XSLoader::load('Sys::Hostname', $VERSION); | |
24 | }; | |
25 | warn $@ if $@; | |
26 | } | |
27 | } | |
28 | ||
29 | ||
30 | sub hostname { | |
31 | ||
32 | # method 1 - we already know it | |
33 | return $host if defined $host; | |
34 | ||
35 | # method 1' - try to ask the system | |
36 | $host = ghname() if defined &ghname; | |
37 | return $host if defined $host; | |
38 | ||
39 | if ($^O eq 'VMS') { | |
40 | ||
41 | # method 2 - no sockets ==> return DECnet node name | |
42 | eval { local $SIG{__DIE__}; $host = (gethostbyname('me'))[0] }; | |
43 | if ($@) { return $host = $ENV{'SYS$NODE'}; } | |
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! | |
59 | $host = ''; | |
60 | croak "Cannot get host name of local machine"; | |
61 | ||
62 | } | |
63 | elsif ($^O eq 'MSWin32') { | |
64 | ($host) = gethostbyname('localhost'); | |
65 | chomp($host = `hostname 2> NUL`) unless defined $host; | |
66 | return $host; | |
67 | } | |
68 | elsif ($^O eq 'epoc') { | |
69 | $host = 'localhost'; | |
70 | return $host; | |
71 | } | |
72 | else { # Unix | |
73 | # is anyone going to make it here? | |
74 | ||
75 | local $ENV{PATH} = '/usr/bin:/bin:/usr/sbin:/sbin'; # Paranoia. | |
76 | ||
77 | # method 2 - syscall is preferred since it avoids tainting problems | |
78 | # XXX: is it such a good idea to return hostname untainted? | |
79 | eval { | |
80 | local $SIG{__DIE__}; | |
81 | require "syscall.ph"; | |
82 | $host = "\0" x 65; ## preload scalar | |
83 | syscall(&SYS_gethostname, $host, 65) == 0; | |
84 | } | |
85 | ||
86 | # method 2a - syscall using systeminfo instead of gethostname | |
87 | # -- needed on systems like Solaris | |
88 | || eval { | |
89 | local $SIG{__DIE__}; | |
90 | require "sys/syscall.ph"; | |
91 | require "sys/systeminfo.ph"; | |
92 | $host = "\0" x 65; ## preload scalar | |
93 | syscall(&SYS_systeminfo, &SI_HOSTNAME, $host, 65) != -1; | |
94 | } | |
95 | ||
96 | # method 3 - trusty old hostname command | |
97 | || eval { | |
98 | local $SIG{__DIE__}; | |
99 | local $SIG{CHLD}; | |
100 | $host = `(hostname) 2>/dev/null`; # bsdish | |
101 | } | |
102 | ||
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 | ||
111 | # method 5 - sysV uname command (may truncate) | |
112 | || eval { | |
113 | local $SIG{__DIE__}; | |
114 | $host = `uname -n 2>/dev/null`; ## sysVish | |
115 | } | |
116 | ||
117 | # method 6 - Apollo pre-SR10 | |
118 | || eval { | |
119 | local $SIG{__DIE__}; | |
120 | my($a,$b,$c,$d); | |
121 | ($host,$a,$b,$c,$d)=split(/[:\. ]/,`/com/host`,6); | |
122 | } | |
123 | ||
124 | # bummer | |
125 | || croak "Cannot get host name of local machine"; | |
126 | ||
127 | # remove garbage | |
128 | $host =~ tr/\0\r\n//d; | |
129 | $host; | |
130 | } | |
131 | } | |
132 | ||
133 | 1; | |
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 |