lib/PXElator/dnsd.pm

package dnsd;
 
use warnings;
use strict;

use Net::DNS::Nameserver;
use Net::DNS::Resolver;
use Data::Dump qw/dump/;
use CouchDB;

use server;
our $debug = server::debug;

my $res = Net::DNS::Resolver->new(
#       nameserver => [ '10.60.0.1' ],
        recurse => 1,
        debug => $debug,
);

our $ptr_cache;
sub name_ip {
        my ( $name, $ip ) = @_;
        $ptr_cache->{ join('.', reverse split(/\./, $ip)) } = $name;
        return $ip;
}

sub reply_handler {
        my ($qname, $qclass, $qtype, $peerhost,$query,$conn) = @_;
        my ($rcode, @ans, @auth, @add);

        server->refresh;
        $debug = server::debug;

        CouchDB::audit( 'request', {
                qname => $qname,
                qclass => $qclass,
                qtype => $qtype,
                peerhost =>  $peerhost,
                sockhost => $conn->{"sockhost"}
        });

        $query->print if $debug;

        my $local = $1     if $qname =~ m{^(.+)\.\Q$server::domain_name\E$};
           $local = $qname if $qname !~ m{\.};

        my $ttl = 3600;

        my $audit = { source => 'unknown' };

        if ( $local ) {
                warn "local[$local] $qname $qtype";
                $rcode = "NOERROR";
                my $rdata;
                if ( $qtype eq "A" && $local eq "server" ) {
                        $rdata = name_ip( $local, $server::ip );
                        $audit->{source} = 'local';
                } else {
                        $rcode = "NXDOMAIN";
                }

                push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata") if $ttl;

        } elsif ( $qtype eq 'PTR' && $qname =~ m{^([0-9\.]*)\.in-addr\.arpa$} ) {
                        if ( my $rdata = $ptr_cache->{$1} ) {
                                $rdata .= '.' . $server::domain_name;
                                push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata");
                                $audit->{source} = 'PTR';
                        } else {
warn "## ",dump( $ptr_cache );
                                $rcode = "NXDOMAIN";
                        }
        } elsif ( my $packet = $res->query( $qname, $qtype ) ) {

                $audit->{source} = 'upstream';
                $packet->print;
                push @ans, $_ foreach $packet->answer;
                $rcode = "NOERROR";

        } else {
                # not found
                $rcode = "NXDOMAIN";
        }

        warn "rcode: $rcode ",dump( @ans );

        $audit->{rcode} = $rcode;
        $audit->{ans} = [ map {
                my $data;
                foreach my $n ( keys %$_ ) {
                        $data->{$n} = $_->{$n};
                }
                $data;
        } @ans ];

        CouchDB::audit( 'response', $audit );

        # mark the answer as authoritive (by setting the 'aa' flag
        return ($rcode, \@ans, \@auth, \@add, { aa => 1 });
}

sub start {
        my $ns = Net::DNS::Nameserver->new(
                LocalPort    => 53,
                ReplyHandler => \&reply_handler,
                Verbose      => $debug,
        ) || die "couldn't create nameserver object\n";

        CouchDB::audit('start', { port => 53, domain_name => $server::domain_name });
        warn "DNS $server::domain_name";

        $ns->main_loop;
}

1; 
1	package dnsd;
2
3	use warnings;
4	use strict;
5
6	use Net::DNS::Nameserver;
7	use Net::DNS::Resolver;
8	use Data::Dump qw/dump/;
9	use CouchDB;
10
11	use server;
12	our $debug = server::debug;
13
14	my $res = Net::DNS::Resolver->new(
15	# nameserver => [ '10.60.0.1' ],
16	recurse => 1,
17	debug => $debug,
18	);
19
20	our $ptr_cache;
21	sub name_ip {
22	my ( $name, $ip ) = @_;
23	$ptr_cache->{ join('.', reverse split(/\./, $ip)) } = $name;
24	return $ip;
25	}
26
27	sub reply_handler {
28	my ($qname, $qclass, $qtype, $peerhost,$query,$conn) = @_;
29	my ($rcode, @ans, @auth, @add);
30
31	server->refresh;
32	$debug = server::debug;
33
34	CouchDB::audit( 'request', {
35	qname => $qname,
36	qclass => $qclass,
37	qtype => $qtype,
38	peerhost => $peerhost,
39	sockhost => $conn->{"sockhost"}
40	});
41
42	$query->print if $debug;
43
44	my $local = $1 if $qname =~ m{^(.+)\.\Q$server::domain_name\E$};
45	$local = $qname if $qname !~ m{\.};
46
47	my $ttl = 3600;
48
49	my $audit = { source => 'unknown' };
50
51	if ( $local ) {
52	warn "local[$local] $qname $qtype";
53	$rcode = "NOERROR";
54	my $rdata;
55	if ( $qtype eq "A" && $local eq "server" ) {
56	$rdata = name_ip( $local, $server::ip );
57	$audit->{source} = 'local';
58	} else {
59	$rcode = "NXDOMAIN";
60	}
61
62	push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata") if $ttl;
63
64	} elsif ( $qtype eq 'PTR' && $qname =~ m{^([0-9\.]*)\.in-addr\.arpa$} ) {
65	if ( my $rdata = $ptr_cache->{$1} ) {
66	$rdata .= '.' . $server::domain_name;
67	push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata");
68	$audit->{source} = 'PTR';
69	} else {
70	warn "## ",dump( $ptr_cache );
71	$rcode = "NXDOMAIN";
72	}
73	} elsif ( my $packet = $res->query( $qname, $qtype ) ) {
74
75	$audit->{source} = 'upstream';
76	$packet->print;
77	push @ans, $_ foreach $packet->answer;
78	$rcode = "NOERROR";
79
80	} else {
81	# not found
82	$rcode = "NXDOMAIN";
83	}
84
85	warn "rcode: $rcode ",dump( @ans );
86
87	$audit->{rcode} = $rcode;
88	$audit->{ans} = [ map {
89	my $data;
90	foreach my $n ( keys %$_ ) {
91	$data->{$n} = $_->{$n};
92	}
93	$data;
94	} @ans ];
95
96	CouchDB::audit( 'response', $audit );
97
98	# mark the answer as authoritive (by setting the 'aa' flag
99	return ($rcode, \@ans, \@auth, \@add, { aa => 1 });
100	}
101
102	sub start {
103	my $ns = Net::DNS::Nameserver->new(
104	LocalPort => 53,
105	ReplyHandler => \&reply_handler,
106	Verbose => $debug,
107	) \|\| die "couldn't create nameserver object\n";
108
109	CouchDB::audit('start', { port => 53, domain_name => $server::domain_name });
110	warn "DNS $server::domain_name";
111
112	$ns->main_loop;
113	}
114
115	1;