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 |
|
|
|
10 |
dpavlin |
125 |
use server; |
11 |
|
|
our $debug = server::debug; |
12 |
|
|
|
13 |
|
|
my $res = Net::DNS::Resolver->new( |
14 |
|
|
# nameserver => [ '10.60.0.1' ], |
15 |
|
|
recurse => 1, |
16 |
|
|
debug => $debug, |
17 |
|
|
); |
18 |
|
|
|
19 |
dpavlin |
150 |
our $ptr_cache; |
20 |
|
|
sub name_ip { |
21 |
|
|
my ( $name, $ip ) = @_; |
22 |
|
|
$ptr_cache->{ join('.', reverse split(/\./, $ip)) } = $name; |
23 |
|
|
return $ip; |
24 |
|
|
} |
25 |
|
|
|
26 |
dpavlin |
122 |
sub reply_handler { |
27 |
|
|
my ($qname, $qclass, $qtype, $peerhost,$query,$conn) = @_; |
28 |
|
|
my ($rcode, @ans, @auth, @add); |
29 |
|
|
|
30 |
dpavlin |
128 |
server->refresh; |
31 |
dpavlin |
150 |
$debug = server::debug; |
32 |
dpavlin |
128 |
|
33 |
dpavlin |
150 |
print "$qname $qclass $qtype $peerhost to ". $conn->{"sockhost"}. "\n"; |
34 |
|
|
$query->print if $debug; |
35 |
dpavlin |
122 |
|
36 |
dpavlin |
150 |
my $local = $1 if $qname =~ m{^(.+)\.\Q$server::domain_name\E$}; |
37 |
|
|
$local = $qname if $qname !~ m{\.}; |
38 |
|
|
|
39 |
|
|
my $ttl = 3600; |
40 |
|
|
|
41 |
|
|
if ( $local ) { |
42 |
|
|
warn "local[$local] $qname $qtype"; |
43 |
|
|
$rcode = "NOERROR"; |
44 |
|
|
my $rdata; |
45 |
|
|
if ( $qtype eq "A" && $local eq "server" ) { |
46 |
dpavlin |
152 |
$rdata = name_ip( $local, $server::ip ); |
47 |
dpavlin |
148 |
} else { |
48 |
|
|
$rcode = "NXDOMAIN"; |
49 |
|
|
} |
50 |
dpavlin |
122 |
|
51 |
dpavlin |
150 |
push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata") if $ttl; |
52 |
|
|
|
53 |
|
|
} elsif ( $qtype eq 'PTR' && $qname =~ m{^([0-9\.]*)\.in-addr\.arpa$} ) { |
54 |
|
|
if ( my $rdata = $ptr_cache->{$1} ) { |
55 |
|
|
$rdata .= '.' . $server::domain_name; |
56 |
|
|
push @ans, Net::DNS::RR->new("$qname $ttl $qclass $qtype $rdata"); |
57 |
|
|
} else { |
58 |
|
|
warn "## ",dump( $ptr_cache ); |
59 |
|
|
$rcode = "NXDOMAIN"; |
60 |
|
|
} |
61 |
dpavlin |
125 |
} elsif ( my $packet = $res->query( $qname, $qtype ) ) { |
62 |
|
|
|
63 |
|
|
$packet->print; |
64 |
|
|
push @ans, $_ foreach $packet->answer; |
65 |
|
|
$rcode = "NOERROR"; |
66 |
|
|
|
67 |
|
|
} else { |
68 |
|
|
# not found |
69 |
|
|
$rcode = "NXDOMAIN"; |
70 |
dpavlin |
122 |
} |
71 |
|
|
|
72 |
dpavlin |
148 |
warn "rcode: $rcode ",dump( @ans ); |
73 |
|
|
|
74 |
dpavlin |
122 |
# mark the answer as authoritive (by setting the 'aa' flag |
75 |
|
|
return ($rcode, \@ans, \@auth, \@add, { aa => 1 }); |
76 |
|
|
} |
77 |
|
|
|
78 |
|
|
sub start { |
79 |
|
|
my $ns = Net::DNS::Nameserver->new( |
80 |
|
|
LocalPort => 53, |
81 |
|
|
ReplyHandler => \&reply_handler, |
82 |
dpavlin |
125 |
Verbose => $debug, |
83 |
dpavlin |
122 |
) || die "couldn't create nameserver object\n"; |
84 |
|
|
|
85 |
dpavlin |
148 |
warn "DNS $server::domain_name"; |
86 |
|
|
|
87 |
dpavlin |
122 |
$ns->main_loop; |
88 |
|
|
} |
89 |
|
|
|
90 |
dpavlin |
148 |
1; |