--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/releasing/cbrtools/perl/Net/Domain.pm Fri Jun 25 18:37:20 2010 +0800
@@ -0,0 +1,342 @@
+# Net::Domain.pm
+#
+# Copyright (c) 1995-1998 Graham Barr <gbarr@pobox.com>. All rights reserved.
+# This program is free software; you can redistribute it and/or
+# modify it under the same terms as Perl itself.
+
+package Net::Domain;
+
+require Exporter;
+
+use Carp;
+use strict;
+use vars qw($VERSION @ISA @EXPORT_OK);
+use Net::Config;
+
+@ISA = qw(Exporter);
+@EXPORT_OK = qw(hostname hostdomain hostfqdn domainname);
+
+$VERSION = "2.19"; # $Id: //depot/libnet/Net/Domain.pm#21 $
+
+my($host,$domain,$fqdn) = (undef,undef,undef);
+
+# Try every conceivable way to get hostname.
+
+sub _hostname {
+
+ # we already know it
+ return $host
+ if(defined $host);
+
+ if ($^O eq 'MSWin32') {
+ require Socket;
+ my ($name,$alias,$type,$len,@addr) = gethostbyname($ENV{'COMPUTERNAME'}||'localhost');
+ while (@addr)
+ {
+ my $a = shift(@addr);
+ $host = gethostbyaddr($a,Socket::AF_INET());
+ last if defined $host;
+ }
+ if (defined($host) && index($host,'.') > 0) {
+ $fqdn = $host;
+ ($host,$domain) = $fqdn =~ /^([^\.]+)\.(.*)$/;
+ }
+ return $host;
+ }
+ elsif ($^O eq 'MacOS') {
+ chomp ($host = `hostname`);
+ }
+ elsif ($^O eq 'VMS') { ## multiple varieties of net s/w makes this hard
+ $host = $ENV{'UCX$INET_HOST'} if defined($ENV{'UCX$INET_HOST'});
+ $host = $ENV{'MULTINET_HOST_NAME'} if defined($ENV{'MULTINET_HOST_NAME'});
+ if (index($host,'.') > 0) {
+ $fqdn = $host;
+ ($host,$domain) = $fqdn =~ /^([^\.]+)\.(.*)$/;
+ }
+ return $host;
+ }
+ else {
+ local $SIG{'__DIE__'};
+
+ # syscall is preferred since it avoids tainting problems
+ eval {
+ my $tmp = "\0" x 256; ## preload scalar
+ eval {
+ package main;
+ require "syscall.ph";
+ defined(&main::SYS_gethostname);
+ }
+ || eval {
+ package main;
+ require "sys/syscall.ph";
+ defined(&main::SYS_gethostname);
+ }
+ and $host = (syscall(&main::SYS_gethostname, $tmp, 256) == 0)
+ ? $tmp
+ : undef;
+ }
+
+ # POSIX
+ || eval {
+ require POSIX;
+ $host = (POSIX::uname())[1];
+ }
+
+ # trusty old hostname command
+ || eval {
+ chop($host = `(hostname) 2>/dev/null`); # BSD'ish
+ }
+
+ # sysV/POSIX uname command (may truncate)
+ || eval {
+ chop($host = `uname -n 2>/dev/null`); ## SYSV'ish && POSIX'ish
+ }
+
+ # Apollo pre-SR10
+ || eval {
+ $host = (split(/[:\. ]/,`/com/host`,6))[0];
+ }
+
+ || eval {
+ $host = "";
+ };
+ }
+
+ # remove garbage
+ $host =~ s/[\0\r\n]+//go;
+ $host =~ s/(\A\.+|\.+\Z)//go;
+ $host =~ s/\.\.+/\./go;
+
+ $host;
+}
+
+sub _hostdomain {
+
+ # we already know it
+ return $domain
+ if(defined $domain);
+
+ local $SIG{'__DIE__'};
+
+ return $domain = $NetConfig{'inet_domain'}
+ if defined $NetConfig{'inet_domain'};
+
+ # try looking in /etc/resolv.conf
+ # putting this here and assuming that it is correct, eliminates
+ # calls to gethostbyname, and therefore DNS lookups. This helps
+ # those on dialup systems.
+
+ local *RES;
+ local($_);
+
+ if(open(RES,"/etc/resolv.conf")) {
+ while(<RES>) {
+ $domain = $1
+ if(/\A\s*(?:domain|search)\s+(\S+)/);
+ }
+ close(RES);
+
+ return $domain
+ if(defined $domain);
+ }
+
+ # just try hostname and system calls
+
+ my $host = _hostname();
+ my(@hosts);
+
+ @hosts = ($host,"localhost");
+
+ unless (defined($host) && $host =~ /\./) {
+ my $dom = undef;
+ eval {
+ my $tmp = "\0" x 256; ## preload scalar
+ eval {
+ package main;
+ require "syscall.ph";
+ }
+ || eval {
+ package main;
+ require "sys/syscall.ph";
+ }
+ and $dom = (syscall(&main::SYS_getdomainname, $tmp, 256) == 0)
+ ? $tmp
+ : undef;
+ };
+
+ if ( $^O eq 'VMS' ) {
+ $dom ||= $ENV{'TCPIP$INET_DOMAIN'}
+ || $ENV{'UCX$INET_DOMAIN'};
+ }
+
+ chop($dom = `domainname 2>/dev/null`)
+ unless(defined $dom || $^O =~ /^(?:cygwin|MSWin32)/);
+
+ if(defined $dom) {
+ my @h = ();
+ $dom =~ s/^\.+//;
+ while(length($dom)) {
+ push(@h, "$host.$dom");
+ $dom =~ s/^[^.]+.+// or last;
+ }
+ unshift(@hosts,@h);
+ }
+ }
+
+ # Attempt to locate FQDN
+
+ foreach (grep {defined $_} @hosts) {
+ my @info = gethostbyname($_);
+
+ next unless @info;
+
+ # look at real name & aliases
+ my $site;
+ foreach $site ($info[0], split(/ /,$info[1])) {
+ if(rindex($site,".") > 0) {
+
+ # Extract domain from FQDN
+
+ ($domain = $site) =~ s/\A[^\.]+\.//;
+ return $domain;
+ }
+ }
+ }
+
+ # Look for environment variable
+
+ $domain ||= $ENV{LOCALDOMAIN} || $ENV{DOMAIN};
+
+ if(defined $domain) {
+ $domain =~ s/[\r\n\0]+//g;
+ $domain =~ s/(\A\.+|\.+\Z)//g;
+ $domain =~ s/\.\.+/\./g;
+ }
+
+ $domain;
+}
+
+sub domainname {
+
+ return $fqdn
+ if(defined $fqdn);
+
+ _hostname();
+ _hostdomain();
+
+ # Assumption: If the host name does not contain a period
+ # and the domain name does, then assume that they are correct
+ # this helps to eliminate calls to gethostbyname, and therefore
+ # eleminate DNS lookups
+
+ return $fqdn = $host . "." . $domain
+ if(defined $host and defined $domain
+ and $host !~ /\./ and $domain =~ /\./);
+
+ # For hosts that have no name, just an IP address
+ return $fqdn = $host if defined $host and $host =~ /^\d+(\.\d+){3}$/;
+
+ my @host = defined $host ? split(/\./, $host) : ('localhost');
+ my @domain = defined $domain ? split(/\./, $domain) : ();
+ my @fqdn = ();
+
+ # Determine from @host & @domain the FQDN
+
+ my @d = @domain;
+
+LOOP:
+ while(1) {
+ my @h = @host;
+ while(@h) {
+ my $tmp = join(".",@h,@d);
+ if((gethostbyname($tmp))[0]) {
+ @fqdn = (@h,@d);
+ $fqdn = $tmp;
+ last LOOP;
+ }
+ pop @h;
+ }
+ last unless shift @d;
+ }
+
+ if(@fqdn) {
+ $host = shift @fqdn;
+ until((gethostbyname($host))[0]) {
+ $host .= "." . shift @fqdn;
+ }
+ $domain = join(".", @fqdn);
+ }
+ else {
+ undef $host;
+ undef $domain;
+ undef $fqdn;
+ }
+
+ $fqdn;
+}
+
+sub hostfqdn { domainname() }
+
+sub hostname {
+ domainname()
+ unless(defined $host);
+ return $host;
+}
+
+sub hostdomain {
+ domainname()
+ unless(defined $domain);
+ return $domain;
+}
+
+1; # Keep require happy
+
+__END__
+
+=head1 NAME
+
+Net::Domain - Attempt to evaluate the current host's internet name and domain
+
+=head1 SYNOPSIS
+
+ use Net::Domain qw(hostname hostfqdn hostdomain);
+
+=head1 DESCRIPTION
+
+Using various methods B<attempt> to find the Fully Qualified Domain Name (FQDN)
+of the current host. From this determine the host-name and the host-domain.
+
+Each of the functions will return I<undef> if the FQDN cannot be determined.
+
+=over 4
+
+=item hostfqdn ()
+
+Identify and return the FQDN of the current host.
+
+=item hostname ()
+
+Returns the smallest part of the FQDN which can be used to identify the host.
+
+=item hostdomain ()
+
+Returns the remainder of the FQDN after the I<hostname> has been removed.
+
+=back
+
+=head1 AUTHOR
+
+Graham Barr <gbarr@pobox.com>.
+Adapted from Sys::Hostname by David Sundstrom <sunds@asictest.sc.ti.com>
+
+=head1 COPYRIGHT
+
+Copyright (c) 1995-1998 Graham Barr. All rights reserved.
+This program is free software; you can redistribute it and/or modify
+it under the same terms as Perl itself.
+
+=for html <hr>
+
+I<$Id: //depot/libnet/Net/Domain.pm#21 $>
+
+=cut