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package dnsd; |
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|
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use warnings; |
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use strict; |
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|
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use Net::DNS::Nameserver; |
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use Net::DNS::Resolver; |
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use Data::Dump qw/dump/; |
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|
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use server; |
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our $debug = server::debug; |
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|
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my $res = Net::DNS::Resolver->new( |
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# nameserver => [ '10.60.0.1' ], |
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recurse => 1, |
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debug => $debug, |
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); |
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|
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our $ptr_cache; |
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sub name_ip { |
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my ( $name, $ip ) = @_; |
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$ptr_cache->{ join('.', reverse split(/\./, $ip)) } = $name; |
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return $ip; |
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} |
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|
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sub reply_handler { |
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my ($qname, $qclass, $qtype, $peerhost,$query,$conn) = @_; |
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my ($rcode, @ans, @auth, @add); |
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|
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server->refresh; |
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$debug = server::debug; |
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|
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print "$qname $qclass $qtype $peerhost to ". $conn->{"sockhost"}. "\n"; |
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$query->print if $debug; |
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|
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my $local = $1 if $qname =~ m{^(.+)\.\Q$server::domain_name\E$}; |
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$local = $qname if $qname !~ m{\.}; |
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|
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my $ttl = 3600; |
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|
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if ( $local ) { |
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warn "local[$local] $qname $qtype"; |
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$rcode = "NOERROR"; |
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my $rdata; |
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if ( $qtype eq "A" && $local eq "server" ) { |
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$rdata = name_ip( $local, $server::ip ); |
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} else { |
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$rcode = "NXDOMAIN"; |
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} |
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|
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push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata") if $ttl; |
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|
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} elsif ( $qtype eq 'PTR' && $qname =~ m{^([0-9\.]*)\.in-addr\.arpa$} ) { |
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if ( my $rdata = $ptr_cache->{$1} ) { |
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$rdata .= '.' . $server::domain_name; |
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push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata"); |
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} else { |
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warn "## ",dump( $ptr_cache ); |
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$rcode = "NXDOMAIN"; |
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} |
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} elsif ( my $packet = $res->query( $qname, $qtype ) ) { |
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|
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$packet->print; |
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push @ans, $_ foreach $packet->answer; |
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$rcode = "NOERROR"; |
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|
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} else { |
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# not found |
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$rcode = "NXDOMAIN"; |
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} |
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|
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warn "rcode: $rcode ",dump( @ans ); |
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|
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# mark the answer as authoritive (by setting the 'aa' flag |
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return ($rcode, \@ans, \@auth, \@add, { aa => 1 }); |
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} |
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|
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sub start { |
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my $ns = Net::DNS::Nameserver->new( |
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LocalPort => 53, |
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ReplyHandler => \&reply_handler, |
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Verbose => $debug, |
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) || die "couldn't create nameserver object\n"; |
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|
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warn "DNS $server::domain_name"; |
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|
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$ns->main_loop; |
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} |
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|
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1; |
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