| 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 |
if ( $local ) { |
| 50 |
warn "local[$local] $qname $qtype"; |
| 51 |
$rcode = "NOERROR"; |
| 52 |
my $rdata; |
| 53 |
if ( $qtype eq "A" && $local eq "server" ) { |
| 54 |
$rdata = name_ip( $local, $server::ip ); |
| 55 |
CouchDB::audit('local', $rdata); |
| 56 |
} else { |
| 57 |
$rcode = "NXDOMAIN"; |
| 58 |
} |
| 59 |
|
| 60 |
push @ans, Net::DNS::RR->new("$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 |
$rdata .= '.' . $server::domain_name; |
| 65 |
push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata"); |
| 66 |
CouchDB::audit('ptr', $rdata ); |
| 67 |
} else { |
| 68 |
warn "## ",dump( $ptr_cache ); |
| 69 |
$rcode = "NXDOMAIN"; |
| 70 |
} |
| 71 |
} elsif ( my $packet = $res->query( $qname, $qtype ) ) { |
| 72 |
|
| 73 |
CouchDB::audit( 'upstream', $packet ); |
| 74 |
$packet->print; |
| 75 |
push @ans, $_ foreach $packet->answer; |
| 76 |
$rcode = "NOERROR"; |
| 77 |
|
| 78 |
} else { |
| 79 |
# not found |
| 80 |
$rcode = "NXDOMAIN"; |
| 81 |
} |
| 82 |
|
| 83 |
warn "rcode: $rcode ",dump( @ans ); |
| 84 |
|
| 85 |
CouchDB::audit('response', { rcode => $rcode, ans => [ @ans ], auth => [ @auth ], add => [ @add ] }); |
| 86 |
|
| 87 |
# mark the answer as authoritive (by setting the 'aa' flag |
| 88 |
return ($rcode, \@ans, \@auth, \@add, { aa => 1 }); |
| 89 |
} |
| 90 |
|
| 91 |
sub start { |
| 92 |
my $ns = Net::DNS::Nameserver->new( |
| 93 |
LocalPort => 53, |
| 94 |
ReplyHandler => \&reply_handler, |
| 95 |
Verbose => $debug, |
| 96 |
) || die "couldn't create nameserver object\n"; |
| 97 |
|
| 98 |
CouchDB::audit('start', { listen => { port => 53, domain_name => $server::domain_name } }); |
| 99 |
warn "DNS $server::domain_name"; |
| 100 |
|
| 101 |
$ns->main_loop; |
| 102 |
} |
| 103 |
|
| 104 |
1; |
Parent Directory
| 
Revision Log