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);

        $debug = server::debug;

        my $audit = {
                qname => $qname,
                qclass => $qclass,
                qtype => $qtype,
                peerhost =>  $peerhost,
                sockhost => $conn->{"sockhost"},
                source => 'unknown',
        };

        $query->print if $debug;

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

        my $ttl = 3600;

        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 .= '.' . $server::domain;
                                push @ans, Net::DNS::RR->new("$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 => sub {
                        server->refresh;
                        reply_handler(@_);
                },
                Verbose      => $debug,
        ) || die "couldn't create nameserver object\n";

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

        $ns->main_loop;
}

1; 
1	dpavlin	122	package dnsd;
2
3			use warnings;
4			use strict;
5
6			use Net::DNS::Nameserver;
7	dpavlin	125	use Net::DNS::Resolver;
8	dpavlin	122	use Data::Dump qw/dump/;
9	dpavlin	207	use CouchDB;
10	dpavlin	122
11	dpavlin	125	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	dpavlin	150	our $ptr_cache;
21			sub name_ip {
22			my ( $name, $ip ) = @_;
23			$ptr_cache->{ join('.', reverse split(/\./, $ip)) } = $name;
24			return $ip;
25			}
26
27	dpavlin	122	sub reply_handler {
28			my ($qname, $qclass, $qtype, $peerhost,$query,$conn) = @_;
29			my ($rcode, @ans, @auth, @add);
30
31	dpavlin	150	$debug = server::debug;
32	dpavlin	128
33	dpavlin	259	my $audit = {
34	dpavlin	207	qname => $qname,
35			qclass => $qclass,
36			qtype => $qtype,
37			peerhost => $peerhost,
38	dpavlin	259	sockhost => $conn->{"sockhost"},
39			source => 'unknown',
40			};
41	dpavlin	207
42	dpavlin	150	$query->print if $debug;
43	dpavlin	122
44	dpavlin	393	my $local = $1 if $qname =~ m{^(.+)\.\Q$server::domain\E$};
45	dpavlin	150	$local = $qname if $qname !~ m{\.};
46
47			my $ttl = 3600;
48
49			if ( $local ) {
50			warn "local[$local] $qname $qtype";
51			$rcode = "NOERROR";
52			my $rdata;
53			if ( $qtype eq "A" && $local eq "server" ) {
54	dpavlin	152	$rdata = name_ip( $local, $server::ip );
55	dpavlin	211	$audit->{source} = 'local';
56	dpavlin	148	} else {
57			$rcode = "NXDOMAIN";
58			}
59	dpavlin	122
60	dpavlin	150	push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata") if $ttl;
61
62			} elsif ( $qtype eq 'PTR' && $qname =~ m{^([0-9\.]*)\.in-addr\.arpa$} ) {
63			if ( my $rdata = $ptr_cache->{$1} ) {
64	dpavlin	393	$rdata .= '.' . $server::domain;
65	dpavlin	150	push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata");
66	dpavlin	211	$audit->{source} = 'PTR';
67	dpavlin	150	} else {
68			warn "## ",dump( $ptr_cache );
69			$rcode = "NXDOMAIN";
70			}
71	dpavlin	125	} elsif ( my $packet = $res->query( $qname, $qtype ) ) {
72
73	dpavlin	211	$audit->{source} = 'upstream';
74	dpavlin	125	$packet->print;
75			push @ans, $_ foreach $packet->answer;
76			$rcode = "NOERROR";
77
78			} else {
79			# not found
80			$rcode = "NXDOMAIN";
81	dpavlin	122	}
82
83	dpavlin	148	warn "rcode: $rcode ",dump( @ans );
84
85	dpavlin	211	$audit->{rcode} = $rcode;
86	dpavlin	223	$audit->{ans} = [ map {
87			my $data;
88			foreach my $n ( keys %$_ ) {
89			$data->{$n} = $_->{$n};
90			}
91			$data;
92			} @ans ];
93	dpavlin	207
94	dpavlin	211	CouchDB::audit( 'response', $audit );
95
96	dpavlin	122	# mark the answer as authoritive (by setting the 'aa' flag
97			return ($rcode, \@ans, \@auth, \@add, { aa => 1 });
98			}
99
100			sub start {
101			my $ns = Net::DNS::Nameserver->new(
102			LocalPort => 53,
103	dpavlin	259	ReplyHandler => sub {
104			server->refresh;
105			reply_handler(@_);
106			},
107	dpavlin	125	Verbose => $debug,
108	dpavlin	122	) \|\| die "couldn't create nameserver object\n";
109
110	dpavlin	393	CouchDB::audit('start', { port => 53, domain => $server::domain });
111			warn "DNS $server::domain";
112	dpavlin	148
113	dpavlin	122	$ns->main_loop;
114			}
115
116	dpavlin	148	1;