Initial Commit

database/perl/vendor/lib/Net/DNS/Resolver/cygwin.pm

@@ -0,0 +1,179 @@
+package Net::DNS::Resolver::cygwin;
+
+use strict;
+use warnings;
+our $VERSION = (qw$Id: cygwin.pm 1811 2020-10-05 08:24:23Z willem $)[2];
+
+
+=head1 NAME
+
+Net::DNS::Resolver::cygwin - Cygwin resolver class
+
+=cut
+
+
+use base qw(Net::DNS::Resolver::Base);
+use IO::File;
+
+
+sub _getregkey {
+	my @key = @_;
+
+	my $handle = IO::File->new( join( '/', @key ), '<' ) or return '';
+	my $value  = <$handle> || '';
+	close($handle);
+
+	$value =~ s/\0+$//;
+	return $value;
+}
+
+
+sub _init {
+	my $defaults = shift->_defaults;
+
+	my $dirhandle;
+
+	my $root = '/proc/registry/HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Tcpip/Parameters';
+
+	unless ( -d $root ) {
+
+		# Doesn't exist, maybe we are on 95/98/Me?
+		$root = '/proc/registry/HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/VxD/MSTCP';
+		-d $root || Carp::croak "can't read registry: $!";
+	}
+
+	# Best effort to find a useful domain name for the current host
+	# if domain ends up blank, we're probably (?) not connected anywhere
+	# a DNS server is interesting either...
+	my $domain = _getregkey( $root, 'Domain' ) || _getregkey( $root, 'DhcpDomain' );
+
+	# If nothing else, the searchlist should probably contain our own domain
+	# also see below for domain name devolution if so configured
+	# (also remove any duplicates later)
+	my $devolution = _getregkey( $root, 'UseDomainNameDevolution' );
+	my $searchlist = _getregkey( $root, 'SearchList' );
+	my @searchlist = ( $domain, split m/[\s,]+/, $searchlist );
+
+
+	# This is (probably) adequate on NT4
+	my @nt4nameservers;
+	foreach ( grep {length} _getregkey( $root, 'NameServer' ), _getregkey( $root, 'DhcpNameServer' ) ) {
+		push @nt4nameservers, split m/[\s,]+/;
+		last;
+	}
+
+
+	# but on W2K/XP the registry layout is more advanced due to dynamically
+	# appearing connections. So we attempt to handle them, too...
+	# opt to silently fail if something isn't ok (maybe we're on NT4)
+	# If this doesn't fail override any NT4 style result we found, as it
+	# may be there but is not valid.
+	# drop any duplicates later
+	my @nameservers;
+
+	my $dnsadapters = join '/', $root, 'DNSRegisteredAdapters';
+	if ( opendir( $dirhandle, $dnsadapters ) ) {
+		my @adapters = grep { !/^\.\.?$/ } readdir($dirhandle);
+		closedir($dirhandle);
+		foreach my $adapter (@adapters) {
+			my $ns = _getregkey( $dnsadapters, $adapter, 'DNSServerAddresses' );
+			until ( length($ns) < 4 ) {
+				push @nameservers, join '.', unpack( 'C4', $ns );
+				substr( $ns, 0, 4 ) = '';
+			}
+		}
+	}
+
+	my $interfaces = join '/', $root, 'Interfaces';
+	if ( opendir( $dirhandle, $interfaces ) ) {
+		my @ifacelist = grep { !/^\.\.?$/ } readdir($dirhandle);
+		closedir($dirhandle);
+		foreach my $iface (@ifacelist) {
+			my $ip = _getregkey( $interfaces, $iface, 'DhcpIPAddress' )
+					|| _getregkey( $interfaces, $iface, 'IPAddress' );
+			next unless $ip;
+			next if $ip eq '0.0.0.0';
+
+			foreach (
+				grep {length} _getregkey( $interfaces, $iface, 'NameServer' ),
+				_getregkey( $interfaces, $iface, 'DhcpNameServer' )
+				) {
+				push @nameservers, split m/[\s,]+/;
+				last;
+			}
+		}
+	}
+
+	@nameservers = @nt4nameservers unless @nameservers;
+	$defaults->nameservers(@nameservers);
+
+
+	# fix devolution if configured, and simultaneously
+	# eliminate duplicate entries (but keep the order)
+	my @list;
+	my %seen;
+	foreach (@searchlist) {
+		s/\.+$//;
+		push( @list, $_ ) unless $seen{lc $_}++;
+
+		next unless $devolution;
+
+		# while there are more than two labels, cut
+		while (s#^[^.]+\.(.+\..+)$#$1#) {
+			push( @list, $_ ) unless $seen{lc $_}++;
+		}
+	}
+	$defaults->searchlist(@list);
+
+	%$defaults = Net::DNS::Resolver::Base::_untaint(%$defaults);
+
+	$defaults->_read_env;
+	return;
+}
+
+
+1;
+__END__
+
+
+=head1 SYNOPSIS
+
+    use Net::DNS::Resolver;
+
+=head1 DESCRIPTION
+
+This class implements the OS specific portions of C<Net::DNS::Resolver>.
+
+No user serviceable parts inside, see L<Net::DNS::Resolver>
+for all your resolving needs.
+
+=head1 COPYRIGHT
+
+Copyright (c)2003 Sidney Markowitz.
+
+All rights reserved.
+
+=head1 LICENSE
+
+Permission to use, copy, modify, and distribute this software and its
+documentation for any purpose and without fee is hereby granted, provided
+that the above copyright notice appear in all copies and that both that
+copyright notice and this permission notice appear in supporting
+documentation, and that the name of the author not be used in advertising
+or publicity pertaining to distribution of the software without specific
+prior written permission.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
+
+=head1 SEE ALSO
+
+L<perl>, L<Net::DNS>, L<Net::DNS::Resolver>
+
+=cut
+