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package Net::DNS::Resolver::MSWin32; use strict; use warnings; our $VERSION = (qw$Id: MSWin32.pm 1856 2021-12-02 14:36:25Z willem $)[2]; =head1 NAME Net::DNS::Resolver::MSWin32 - MS Windows resolver class =cut use base qw(Net::DNS::Resolver::Base); use Carp; use constant WINHLP => defined eval 'require Win32::IPHelper'; ## no critic use constant WINREG => defined eval 'use Win32::TieRegistry qw(KEY_READ REG_DWORD); 1'; ## no critic our $Registry; sub _init { my $defaults = shift->_defaults; my $debug = 0; my $FIXED_INFO = {}; my $err = Win32::IPHelper::GetNetworkParams($FIXED_INFO); croak "GetNetworkParams() error %u: %s\n", $err, Win32::FormatMessage($err) if $err; if ($debug) { require Data::Dumper; print Data::Dumper::Dumper $FIXED_INFO; } my @nameservers = map { $_->{IpAddress} } @{$FIXED_INFO->{DnsServersList}}; $defaults->nameservers(@nameservers); my $devolution = 0; my $domainname = $FIXED_INFO->{DomainName} || ''; my @searchlist = grep {length} $domainname; if (WINREG) { # The Win32::IPHelper does not return searchlist. # Make best effort attempt to get searchlist from the registry. my @root = qw(HKEY_LOCAL_MACHINE SYSTEM CurrentControlSet Services); my $leaf = join '\\', @root, qw(Tcpip Parameters); my $reg_tcpip = $Registry->Open( $leaf, {Access => KEY_READ} ); unless ( defined $reg_tcpip ) { # Didn't work, Win95/98/Me? $leaf = join '\\', @root, qw(VxD MSTCP); $reg_tcpip = $Registry->Open( $leaf, {Access => KEY_READ} ); } if ( defined $reg_tcpip ) { my $searchlist = $reg_tcpip->GetValue('SearchList') || ''; push @searchlist, split m/[\s,]+/, $searchlist; my ( $value, $type ) = $reg_tcpip->GetValue('UseDomainNameDevolution'); $devolution = defined $value && $type == REG_DWORD ? hex $value : 0; } } # fix devolution if configured, and simultaneously # eliminate duplicate entries (but keep the order) my @list; my %seen; foreach (@searchlist) { s/\.+$//; 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 Chris Reinhardt. Portions Copyright (c)2009 Olaf Kolkman, NLnet Labs 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 original copyright notices appear in all copies and that both 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