line |
stmt |
bran |
cond |
sub |
pod |
time |
code |
1
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package ParaDNS::Resolver; |
2
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1
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1
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5
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use base qw(Danga::Socket); |
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1
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2
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1
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1156
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3
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4
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1
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1
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30270
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use fields qw(res dst queries); |
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1
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2
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1
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11
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5
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6
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1
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1
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828
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use Net::DNS; |
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1
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115204
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1
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133
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7
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1
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1
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14
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use Socket; |
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1
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2
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1
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780
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8
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1
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1
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8
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use strict; |
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1
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2
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1
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49
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9
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10
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1
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1
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6
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no warnings 'deprecated'; |
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1
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3
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1
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61
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11
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12
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1
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50
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1
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6
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use constant TRACE_LEVEL => ($ENV{PARADNS_DEBUG} || 0); |
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1
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2
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1
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77
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13
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1
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50
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1
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6
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use constant NO_DNS0x20 => ($ENV{NO_DNS0x20} || 0); |
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1
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2
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1
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2340
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14
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*trace = \&ParaDNS::trace; |
15
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16
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sub new { |
17
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1
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1
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1
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2
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my ParaDNS::Resolver $self = shift; |
18
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1
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4
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my $servers = shift; |
19
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20
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1
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50
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7
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$self = fields::new($self) unless ref $self; |
21
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22
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1
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219
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my $res = Net::DNS::Resolver->new; |
23
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24
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1
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50
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634
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my $sock = IO::Socket::INET->new( |
25
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Proto => 'udp', |
26
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LocalAddr => $res->{'srcaddr'}, |
27
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LocalPort => ($res->{'srcport'} || undef), |
28
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) || die "Cannot create socket: $!"; |
29
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1
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298
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IO::Handle::blocking($sock, 0); |
30
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31
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1
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4
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$self->{dst} = []; |
32
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33
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1
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50
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4
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if ($servers) { |
34
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0
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0
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foreach my $ns (@{$servers}) { |
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0
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0
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35
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0
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0
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my ($s, $p) = split(/:/, $ns); |
36
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0
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0
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0
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$p = 53 if !$p; |
37
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0
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0
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my $dst_sockaddr = sockaddr_in($p, inet_aton($s)); |
38
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0
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0
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push @{$self->{dst}}, $dst_sockaddr; |
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0
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0
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39
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0
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0
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trace(2, "Using override nameserver $s:$p\n"); |
40
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} |
41
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} |
42
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else { |
43
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1
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3
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foreach my $ns (@{ $res->{nameservers} }) { |
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1
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5
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44
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0
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0
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trace(2, "Using nameserver $ns:$res->{port}\n"); |
45
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0
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0
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my $dst_sockaddr = sockaddr_in($res->{'port'}, inet_aton($ns)); |
46
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0
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0
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push @{$self->{dst}}, $dst_sockaddr; |
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0
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0
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47
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} |
48
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} |
49
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50
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1
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3
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$self->{res} = $res; |
51
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52
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# copied from SpamAssassin (I think all are irrelevant, but just in case...) |
53
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1
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16
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$self->{res}->retry(1); # If it fails, it fails |
54
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1
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36
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$self->{res}->retrans(0); # If it fails, it fails |
55
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1
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35
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$self->{res}->dnsrch(0); # ignore domain search-list |
56
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1
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34
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$self->{res}->defnames(0); # don't append stuff to end of query |
57
|
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# I think these values are irrelevant... |
58
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1
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34
|
$self->{res}->tcp_timeout($ParaDNS::TIMEOUT); # timeout |
59
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1
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34
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$self->{res}->udp_timeout($ParaDNS::TIMEOUT); # timeout |
60
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1
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44
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$self->{res}->persistent_tcp(0); # bug 3997 |
61
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1
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35
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$self->{res}->persistent_udp(0); # bug 3997 |
62
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63
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1
|
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26
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$self->{queries} = {}; |
64
|
|
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|
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65
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1
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12
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$self->SUPER::new($sock); |
66
|
|
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67
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1
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0
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102
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Danga::Socket->AddTimer(1, sub { $self->_do_cleanup }); |
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0
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0
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68
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69
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1
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26
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$self->watch_read(1); |
70
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71
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1
|
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28
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return $self; |
72
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} |
73
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74
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|
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sub ns { |
75
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4
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4
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0
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5
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my ParaDNS::Resolver $self = shift; |
76
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4
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5
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my $index = shift; |
77
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4
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50
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|
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5
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return if $index > $#{$self->{dst}}; |
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4
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18
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78
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0
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0
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return $self->{dst}->[$index]; |
79
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} |
80
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81
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|
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sub pending { |
82
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0
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|
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0
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0
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0
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my ParaDNS::Resolver $self = shift; |
83
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|
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84
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0
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0
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return keys(%{$self->{queries}}); |
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0
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0
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85
|
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} |
86
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87
|
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|
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# implements draft-vixie-dnsext-dns0x20-00 |
88
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|
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|
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sub dnsext_dns0x20 { |
89
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4
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4
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0
|
5
|
my ($string) = @_; |
90
|
4
|
|
|
|
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5
|
my $rnd; |
91
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4
|
|
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|
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6
|
my $have_rnd_bits = 0; |
92
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4
|
|
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|
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12
|
my $result = ''; |
93
|
4
|
|
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|
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19
|
for my $ic (unpack("C*",$string)) { |
94
|
57
|
100
|
|
|
|
203
|
if (chr($ic) =~ /^[A-Za-z]\z/) { |
95
|
51
|
100
|
|
|
|
92
|
if ($have_rnd_bits < 1) { |
96
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4
|
|
|
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|
40
|
$rnd = rand(0x7fffffff); $have_rnd_bits = 31; |
|
4
|
|
|
|
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5
|
|
97
|
|
|
|
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|
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} |
98
|
51
|
100
|
|
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|
89
|
$ic ^= 0x20 if $rnd & 1; # flip the 0x20 bit in name if dice says so |
99
|
51
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|
|
|
|
45
|
$rnd = $rnd >> 1; $have_rnd_bits--; |
|
51
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|
|
|
|
48
|
|
100
|
|
|
|
|
|
|
} |
101
|
57
|
|
|
|
|
74
|
$result .= chr($ic); |
102
|
|
|
|
|
|
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} |
103
|
4
|
|
|
|
|
12
|
return $result; |
104
|
|
|
|
|
|
|
} |
105
|
|
|
|
|
|
|
|
106
|
|
|
|
|
|
|
sub _query { |
107
|
4
|
|
|
4
|
|
5
|
my ParaDNS::Resolver $self = shift; |
108
|
4
|
|
|
|
|
8
|
my ($asker, $host, $type, $now) = @_; |
109
|
|
|
|
|
|
|
|
110
|
4
|
|
|
|
|
10
|
$host = dnsext_dns0x20($host) unless NO_DNS0x20; |
111
|
|
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|
|
|
|
|
112
|
4
|
|
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26
|
my $packet = $self->{res}->make_query_packet($host, $type); |
113
|
|
|
|
|
|
|
|
114
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4
|
|
|
|
|
4804
|
my $id = $packet->header->id; |
115
|
4
|
|
|
|
|
66
|
while ($self->{queries}->{$id}) { |
116
|
|
|
|
|
|
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# ID already in use, try again :-( |
117
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0
|
|
|
|
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0
|
trace(2, "Query ID $id already in use. Trying another\n") if TRACE_LEVEL >= 2; |
118
|
0
|
|
|
|
|
0
|
$packet = $self->{res}->make_query_packet($host, $type); |
119
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0
|
|
|
|
|
0
|
$id = $packet->header->id; |
120
|
|
|
|
|
|
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} |
121
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4
|
|
|
|
|
16
|
my $packet_data = $packet->data; |
122
|
|
|
|
|
|
|
|
123
|
4
|
50
|
|
|
|
465
|
my $query = ParaDNS::Resolver::Query->new( |
124
|
|
|
|
|
|
|
$self, $asker, $host, $type, $now, $id, $packet_data, |
125
|
|
|
|
|
|
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) or return; |
126
|
0
|
|
|
|
|
0
|
$self->{queries}->{$id} = $query; |
127
|
|
|
|
|
|
|
|
128
|
0
|
|
|
|
|
0
|
return 1; |
129
|
|
|
|
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|
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} |
130
|
|
|
|
|
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|
|
131
|
|
|
|
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|
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sub query_type { |
132
|
4
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|
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4
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0
|
6
|
my ParaDNS::Resolver $self = shift; |
133
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4
|
|
|
|
|
15
|
my ($asker, $type, @hosts) = @_; |
134
|
|
|
|
|
|
|
|
135
|
4
|
|
|
|
|
11
|
my $now = time(); |
136
|
|
|
|
|
|
|
|
137
|
4
|
|
|
|
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5
|
trace(2, "Trying to resolve $type: @hosts\n") if TRACE_LEVEL >= 2; |
138
|
|
|
|
|
|
|
|
139
|
4
|
|
|
|
|
8
|
foreach my $host (@hosts) { |
140
|
4
|
50
|
|
|
|
13
|
$self->_query($asker, $host, $type, $now) || return; |
141
|
|
|
|
|
|
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} |
142
|
|
|
|
|
|
|
|
143
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0
|
|
|
|
|
0
|
return 1; |
144
|
|
|
|
|
|
|
} |
145
|
|
|
|
|
|
|
|
146
|
|
|
|
|
|
|
sub query_txt { |
147
|
0
|
|
|
0
|
0
|
0
|
my ParaDNS::Resolver $self = shift; |
148
|
0
|
|
|
|
|
0
|
my ($asker, @hosts) = @_; |
149
|
0
|
|
|
|
|
0
|
return $self->query_type($asker, "TXT", @hosts); |
150
|
|
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|
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|
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} |
151
|
|
|
|
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|
|
152
|
|
|
|
|
|
|
sub query_mx { |
153
|
0
|
|
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0
|
0
|
0
|
my ParaDNS::Resolver $self = shift; |
154
|
0
|
|
|
|
|
0
|
my ($asker, @hosts) = @_; |
155
|
0
|
|
|
|
|
0
|
return $self->query_type($asker, "MX", @hosts); |
156
|
|
|
|
|
|
|
} |
157
|
|
|
|
|
|
|
|
158
|
|
|
|
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|
|
sub query { |
159
|
0
|
|
|
0
|
0
|
0
|
my ParaDNS::Resolver $self = shift; |
160
|
0
|
|
|
|
|
0
|
my ($asker, @hosts) = @_; |
161
|
|
|
|
|
|
|
|
162
|
0
|
|
|
|
|
0
|
my $now = time(); |
163
|
|
|
|
|
|
|
|
164
|
0
|
|
|
|
|
0
|
trace(2, "trying to resolve A/PTR: @hosts\n") if TRACE_LEVEL >= 2; |
165
|
|
|
|
|
|
|
|
166
|
0
|
|
|
|
|
0
|
foreach my $host (@hosts) { |
167
|
0
|
0
|
|
|
|
0
|
$self->_query($asker, $host, 'A', $now) || return; |
168
|
|
|
|
|
|
|
} |
169
|
|
|
|
|
|
|
|
170
|
0
|
|
|
|
|
0
|
return 1; |
171
|
|
|
|
|
|
|
} |
172
|
|
|
|
|
|
|
|
173
|
|
|
|
|
|
|
sub _do_cleanup { |
174
|
0
|
|
|
0
|
|
0
|
my ParaDNS::Resolver $self = shift; |
175
|
0
|
|
|
|
|
0
|
my $now = time; |
176
|
|
|
|
|
|
|
|
177
|
0
|
|
|
|
|
0
|
my $idle = $ParaDNS::TIMEOUT; |
178
|
|
|
|
|
|
|
|
179
|
0
|
|
|
|
|
0
|
my $t0 = $now - $idle; |
180
|
|
|
|
|
|
|
|
181
|
0
|
|
|
|
|
0
|
my @to_delete; |
182
|
0
|
|
|
|
|
0
|
keys %{$self->{queries}}; # reset internal iterator |
|
0
|
|
|
|
|
0
|
|
183
|
0
|
|
|
|
|
0
|
while (my ($id, $obj) = each(%{$self->{queries}})) { |
|
0
|
|
|
|
|
0
|
|
184
|
0
|
0
|
|
|
|
0
|
if ($obj->{timeout} < $t0) { |
185
|
0
|
|
|
|
|
0
|
push @to_delete, $id; |
186
|
|
|
|
|
|
|
} |
187
|
|
|
|
|
|
|
} |
188
|
|
|
|
|
|
|
|
189
|
0
|
|
|
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0
|
foreach my $id (@to_delete) { |
190
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0
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|
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|
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0
|
my $query = delete $self->{queries}{$id}; |
191
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0
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0
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0
|
$query->timeout() and next; |
192
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|
|
# add back in if timeout caused us to loop to next server |
193
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0
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0
|
$self->{queries}->{$id} = $query; |
194
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|
} |
195
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|
196
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0
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0
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0
|
$self->AddTimer(1, sub { $self->_do_cleanup } ); |
|
0
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0
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197
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|
} |
198
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|
199
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|
|
# ParaDNS |
200
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0
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|
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0
|
1
|
0
|
sub event_err { shift->close("dns socket error") } |
201
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0
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|
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0
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1
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0
|
sub event_hup { shift->close("dns socket error") } |
202
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|
203
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|
my %type_to_host = ( |
204
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|
PTR => 'ptrdname', |
205
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A => 'address', |
206
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AAAA => 'address', |
207
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|
TXT => 'txtdata', |
208
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NS => 'nsdname', |
209
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|
CNAME => 'cname', |
210
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|
); |
211
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212
|
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|
|
sub event_read { |
213
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0
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0
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1
|
0
|
my ParaDNS::Resolver $self = shift; |
214
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|
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|
215
|
0
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|
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0
|
my $sock = $self->sock; |
216
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0
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0
|
my $res = $self->{res}; |
217
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218
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0
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|
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|
|
0
|
while (my $packet = $res->bgread($sock)) { |
219
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0
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0
|
my $err = $res->errorstring; |
220
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0
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0
|
my $answers = 0; |
221
|
0
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0
|
my $header = $packet->header; |
222
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0
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0
|
my $id = $header->id; |
223
|
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|
224
|
0
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|
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|
|
0
|
my $qobj = delete $self->{queries}->{$id}; |
225
|
0
|
0
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|
|
|
0
|
if (!$qobj) { |
226
|
0
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|
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0
|
trace(1, "No query for id: $id\n") if TRACE_LEVEL; |
227
|
0
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|
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0
|
return; |
228
|
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|
|
} |
229
|
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|
230
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0
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0
|
my $query = $qobj->{host}; |
231
|
|
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232
|
0
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|
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0
|
my ($question) = $packet->question; # only ever send one question |
233
|
0
|
0
|
|
|
|
0
|
if (!$question) { |
234
|
0
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|
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|
|
0
|
trace(1, "No question for id: $id. Should be: $query\n") if TRACE_LEVEL; |
235
|
0
|
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|
|
0
|
return; |
236
|
|
|
|
|
|
|
} |
237
|
|
|
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|
|
|
|
238
|
0
|
0
|
0
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|
|
0
|
if ($question->qtype eq 'A' && $question->qname ne $query) { |
239
|
0
|
|
|
|
|
0
|
trace(1, "Query mismatch for id: $id. $query ne " . $question->qname . "\n") if TRACE_LEVEL; |
240
|
0
|
|
|
|
|
0
|
return; |
241
|
|
|
|
|
|
|
} |
242
|
|
|
|
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|
|
|
243
|
0
|
|
|
|
|
0
|
my $now = time(); |
244
|
0
|
|
|
|
|
0
|
foreach my $rr ($packet->answer) { |
245
|
0
|
0
|
|
|
|
0
|
if (my $host_method = $type_to_host{$rr->type}) { |
|
|
0
|
|
|
|
|
|
246
|
0
|
|
|
|
|
0
|
my $host = $rr->$host_method; |
247
|
0
|
|
|
|
|
0
|
trace(2, "Answer: " . $rr->type . " $host\n") if TRACE_LEVEL; |
248
|
0
|
0
|
0
|
|
|
0
|
if ($rr->type eq 'CNAME' && $qobj->recurse_cname) { |
249
|
|
|
|
|
|
|
# TODO: Should probably loop over the other answers here to check |
250
|
|
|
|
|
|
|
# for an answer to the question we're just about to ask... |
251
|
|
|
|
|
|
|
# (on the other hand, this works) |
252
|
|
|
|
|
|
|
|
253
|
0
|
|
|
|
|
0
|
my $packet = $res->make_query_packet($host, $qobj->type); |
254
|
|
|
|
|
|
|
|
255
|
0
|
|
|
|
|
0
|
my $packet_data = $packet->data; |
256
|
0
|
|
|
|
|
0
|
my $id = $packet->header->id; |
257
|
|
|
|
|
|
|
|
258
|
0
|
0
|
|
|
|
0
|
my $query = ParaDNS::Resolver::Query->new( |
259
|
|
|
|
|
|
|
$self, $qobj->asker, $host, $qobj->type, time, $id, $packet_data, |
260
|
|
|
|
|
|
|
) or next; |
261
|
0
|
|
|
|
|
0
|
$self->{queries}->{$id} = $query; |
262
|
0
|
|
|
|
|
0
|
next; |
263
|
|
|
|
|
|
|
} |
264
|
|
|
|
|
|
|
#my $type = $rr->type; |
265
|
|
|
|
|
|
|
#$type = 'A' if $type eq 'PTR'; |
266
|
|
|
|
|
|
|
# print "DNS Lookup $type $query = $host; TTL = ", $rr->ttl, "\n"; |
267
|
0
|
|
|
|
|
0
|
$qobj->run_callback($host, $rr->ttl); |
268
|
|
|
|
|
|
|
} |
269
|
|
|
|
|
|
|
elsif ($rr->type eq "MX") { |
270
|
0
|
|
|
|
|
0
|
my $host = $rr->exchange; |
271
|
0
|
|
|
|
|
0
|
my $preference = $rr->preference; |
272
|
0
|
|
|
|
|
0
|
$qobj->run_callback([$host, $preference], $rr->ttl); |
273
|
|
|
|
|
|
|
} |
274
|
|
|
|
|
|
|
else { |
275
|
|
|
|
|
|
|
# came back, but not a PTR or A record |
276
|
0
|
|
|
|
|
0
|
$qobj->run_callback("UNKNOWN"); |
277
|
|
|
|
|
|
|
} |
278
|
0
|
|
|
|
|
0
|
$answers++; |
279
|
|
|
|
|
|
|
} |
280
|
0
|
0
|
|
|
|
0
|
if (!$answers) { |
281
|
0
|
0
|
|
|
|
0
|
if ($err eq "NXDOMAIN") { |
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
|
|
0
|
|
|
|
|
|
282
|
|
|
|
|
|
|
# trace("found => NXDOMAIN\n"); |
283
|
0
|
|
|
|
|
0
|
$qobj->run_callback("NXDOMAIN"); |
284
|
|
|
|
|
|
|
} |
285
|
|
|
|
|
|
|
elsif ($err eq "SERVFAIL") { |
286
|
|
|
|
|
|
|
# try again??? |
287
|
|
|
|
|
|
|
# print "SERVFAIL looking for $query\n"; |
288
|
|
|
|
|
|
|
#$self->query($asker, $query); |
289
|
0
|
0
|
|
|
|
0
|
$qobj->error($err) and next; |
290
|
|
|
|
|
|
|
# add back in if error() resulted in query being re-issued |
291
|
0
|
|
|
|
|
0
|
$self->{queries}->{$id} = $qobj; |
292
|
|
|
|
|
|
|
} |
293
|
|
|
|
|
|
|
elsif ($err eq "NOERROR") { |
294
|
0
|
|
|
|
|
0
|
$qobj->run_callback($err); |
295
|
|
|
|
|
|
|
} |
296
|
|
|
|
|
|
|
elsif($err) { |
297
|
|
|
|
|
|
|
#print("Unknown error: $err\n"); |
298
|
0
|
0
|
|
|
|
0
|
$qobj->error($err) and next; |
299
|
0
|
|
|
|
|
0
|
$self->{queries}->{$id} = $qobj; |
300
|
|
|
|
|
|
|
} |
301
|
|
|
|
|
|
|
else { |
302
|
|
|
|
|
|
|
# trace("no answers\n"); |
303
|
0
|
|
|
|
|
0
|
$qobj->run_callback("NOANSWER"); |
304
|
|
|
|
|
|
|
} |
305
|
|
|
|
|
|
|
} |
306
|
|
|
|
|
|
|
} |
307
|
|
|
|
|
|
|
} |
308
|
|
|
|
|
|
|
|
309
|
1
|
|
|
1
|
|
7
|
use Carp qw(confess); |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
104
|
|
310
|
|
|
|
|
|
|
|
311
|
|
|
|
|
|
|
sub close { |
312
|
0
|
|
|
0
|
1
|
0
|
my ParaDNS::Resolver $self = shift; |
313
|
|
|
|
|
|
|
|
314
|
0
|
|
|
|
|
0
|
$self->SUPER::close(shift); |
315
|
|
|
|
|
|
|
# confess "ParaDNS::Resolver socket should never be closed!"; |
316
|
|
|
|
|
|
|
} |
317
|
|
|
|
|
|
|
|
318
|
|
|
|
|
|
|
package ParaDNS::Resolver::Query; |
319
|
|
|
|
|
|
|
|
320
|
1
|
|
|
1
|
|
13
|
use fields qw( resolver asker host type timeout id data repeat ns nqueries ); |
|
1
|
|
|
|
|
1
|
|
|
1
|
|
|
|
|
9
|
|
321
|
|
|
|
|
|
|
|
322
|
1
|
|
|
1
|
|
172
|
use constant MAX_QUERIES => 10; |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
63
|
|
323
|
|
|
|
|
|
|
|
324
|
1
|
|
50
|
1
|
|
6
|
use constant TRACE_LEVEL => ($ENV{PARADNS_DEBUG} || 0); |
|
1
|
|
|
|
|
2
|
|
|
1
|
|
|
|
|
869
|
|
325
|
|
|
|
|
|
|
*trace = \&ParaDNS::trace; |
326
|
|
|
|
|
|
|
|
327
|
|
|
|
|
|
|
sub new { |
328
|
4
|
|
|
4
|
|
7
|
my ParaDNS::Resolver::Query $self = shift; |
329
|
4
|
50
|
|
|
|
19
|
$self = fields::new($self) unless ref $self; |
330
|
|
|
|
|
|
|
|
331
|
4
|
|
|
|
|
341
|
@$self{qw( resolver asker host type timeout id data )} = @_; |
332
|
|
|
|
|
|
|
# repeat is number of retries |
333
|
4
|
|
|
|
|
14
|
@$self{qw( repeat ns nqueries )} = ($ParaDNS::REQUERY,0,0); |
334
|
|
|
|
|
|
|
|
335
|
4
|
|
|
|
|
6
|
trace(2, "NS Query: $self->{host} ($self->{id})\n") if TRACE_LEVEL >= 2; |
336
|
|
|
|
|
|
|
|
337
|
4
|
50
|
|
|
|
12
|
$self->send_query || return; |
338
|
|
|
|
|
|
|
|
339
|
0
|
|
|
|
|
0
|
return $self; |
340
|
|
|
|
|
|
|
} |
341
|
|
|
|
|
|
|
|
342
|
|
|
|
|
|
|
sub type { |
343
|
0
|
|
|
0
|
|
0
|
my ParaDNS::Resolver::Query $self = shift; |
344
|
0
|
|
|
|
|
0
|
$self->{type}; |
345
|
|
|
|
|
|
|
} |
346
|
|
|
|
|
|
|
|
347
|
|
|
|
|
|
|
sub asker { |
348
|
0
|
|
|
0
|
|
0
|
my ParaDNS::Resolver::Query $self = shift; |
349
|
0
|
|
|
|
|
0
|
$self->{asker}; |
350
|
|
|
|
|
|
|
} |
351
|
|
|
|
|
|
|
|
352
|
|
|
|
|
|
|
sub recurse_cname { |
353
|
0
|
|
|
0
|
|
0
|
my ParaDNS::Resolver::Query $self = shift; |
354
|
|
|
|
|
|
|
|
355
|
0
|
0
|
0
|
|
|
0
|
if ($self->{type} eq 'A' || $self->{type} eq 'AAAA') { |
356
|
0
|
0
|
|
|
|
0
|
if ($self->{nqueries} <= MAX_QUERIES) { |
357
|
0
|
|
|
|
|
0
|
return 1; |
358
|
|
|
|
|
|
|
} |
359
|
|
|
|
|
|
|
} |
360
|
|
|
|
|
|
|
|
361
|
0
|
|
|
|
|
0
|
return 0; |
362
|
|
|
|
|
|
|
} |
363
|
|
|
|
|
|
|
|
364
|
|
|
|
|
|
|
#sub DESTROY { |
365
|
|
|
|
|
|
|
# my $self = shift; |
366
|
|
|
|
|
|
|
# trace(2, "DESTROY $self\n"); |
367
|
|
|
|
|
|
|
#} |
368
|
|
|
|
|
|
|
|
369
|
|
|
|
|
|
|
sub timeout { |
370
|
0
|
|
|
0
|
|
0
|
my ParaDNS::Resolver::Query $self = shift; |
371
|
|
|
|
|
|
|
|
372
|
0
|
|
|
|
|
0
|
trace(2, "NS Query timeout. Trying next host\n") if TRACE_LEVEL >= 2; |
373
|
0
|
0
|
|
|
|
0
|
if ($self->send_query) { |
374
|
|
|
|
|
|
|
# had another NS to send to, reset timeout |
375
|
0
|
|
|
|
|
0
|
$self->{timeout} = time(); |
376
|
0
|
|
|
|
|
0
|
return; |
377
|
|
|
|
|
|
|
} |
378
|
|
|
|
|
|
|
|
379
|
|
|
|
|
|
|
# can we loop/repeat? |
380
|
0
|
0
|
0
|
|
|
0
|
if (($self->{nqueries} <= MAX_QUERIES) && |
381
|
|
|
|
|
|
|
($self->{repeat} > 1)) |
382
|
|
|
|
|
|
|
{ |
383
|
0
|
|
|
|
|
0
|
trace(2, "NS Query timeout. Next host failed. Trying loop\n") if TRACE_LEVEL >= 2; |
384
|
0
|
|
|
|
|
0
|
$self->{repeat}--; |
385
|
0
|
|
|
|
|
0
|
$self->{ns} = 0; |
386
|
0
|
|
|
|
|
0
|
return $self->timeout(); |
387
|
|
|
|
|
|
|
} |
388
|
|
|
|
|
|
|
|
389
|
0
|
|
|
|
|
0
|
trace(2, "NS Query timeout. All failed. Running callback(TIMEOUT)\n") if TRACE_LEVEL >= 2; |
390
|
|
|
|
|
|
|
# otherwise we really must timeout. |
391
|
0
|
|
|
|
|
0
|
$self->run_callback("TIMEOUT"); |
392
|
0
|
|
|
|
|
0
|
return 1; |
393
|
|
|
|
|
|
|
} |
394
|
|
|
|
|
|
|
|
395
|
|
|
|
|
|
|
sub error { |
396
|
0
|
|
|
0
|
|
0
|
my ParaDNS::Resolver::Query $self = shift; |
397
|
0
|
|
|
|
|
0
|
my ($error) = @_; |
398
|
|
|
|
|
|
|
|
399
|
0
|
|
|
|
|
0
|
trace(2, "NS Query error. Trying next host\n") if TRACE_LEVEL >= 2; |
400
|
0
|
0
|
|
|
|
0
|
if ($self->send_query) { |
401
|
|
|
|
|
|
|
# had another NS to send to, reset timeout |
402
|
0
|
|
|
|
|
0
|
$self->{timeout} = time(); |
403
|
0
|
|
|
|
|
0
|
return; |
404
|
|
|
|
|
|
|
} |
405
|
|
|
|
|
|
|
|
406
|
|
|
|
|
|
|
# can we loop/repeat? |
407
|
0
|
0
|
0
|
|
|
0
|
if (($self->{nqueries} <= MAX_QUERIES) && |
408
|
|
|
|
|
|
|
($self->{repeat} > 1)) |
409
|
|
|
|
|
|
|
{ |
410
|
0
|
|
|
|
|
0
|
trace(2, "NS Query error. Next host failed. Trying loop\n") if TRACE_LEVEL >= 2; |
411
|
0
|
|
|
|
|
0
|
$self->{repeat}--; |
412
|
0
|
|
|
|
|
0
|
$self->{ns} = 0; |
413
|
0
|
|
|
|
|
0
|
return $self->error($error); |
414
|
|
|
|
|
|
|
} |
415
|
|
|
|
|
|
|
|
416
|
0
|
|
|
|
|
0
|
trace(2, "NS Query error. All failed. Running callback($error)\n") if TRACE_LEVEL >= 2; |
417
|
|
|
|
|
|
|
# otherwise we really must timeout. |
418
|
0
|
|
|
|
|
0
|
$self->run_callback($error); |
419
|
0
|
|
|
|
|
0
|
return 1; |
420
|
|
|
|
|
|
|
} |
421
|
|
|
|
|
|
|
|
422
|
|
|
|
|
|
|
sub run_callback { |
423
|
0
|
|
|
0
|
|
0
|
my ParaDNS::Resolver::Query $self = shift; |
424
|
0
|
|
|
|
|
0
|
trace(2, "NS Query callback($self->{host} = $_[0]\n") if TRACE_LEVEL >= 2; |
425
|
0
|
|
|
|
|
0
|
$self->{asker}->run_callback($_[0], lc($self->{host}), $_[1]); |
426
|
|
|
|
|
|
|
} |
427
|
|
|
|
|
|
|
|
428
|
|
|
|
|
|
|
sub send_query { |
429
|
4
|
|
|
4
|
|
6
|
my ParaDNS::Resolver::Query $self = shift; |
430
|
|
|
|
|
|
|
|
431
|
4
|
|
|
|
|
5
|
my $res = $self->{resolver}; |
432
|
4
|
|
|
|
|
17
|
my $dst = $res->ns($self->{ns}++); |
433
|
4
|
50
|
|
|
|
77
|
return unless defined $dst; |
434
|
0
|
0
|
|
|
|
|
if (!$res->sock->send($self->{data}, 0, $dst)) { |
435
|
0
|
|
|
|
|
|
warn("socket send failed: $!"); |
436
|
0
|
|
|
|
|
|
return; |
437
|
|
|
|
|
|
|
} |
438
|
|
|
|
|
|
|
|
439
|
0
|
|
|
|
|
|
$self->{nqueries}++; |
440
|
0
|
|
|
|
|
|
return 1; |
441
|
|
|
|
|
|
|
} |
442
|
|
|
|
|
|
|
|
443
|
|
|
|
|
|
|
1; |
444
|
|
|
|
|
|
|
|
445
|
|
|
|
|
|
|
=head1 NAME |
446
|
|
|
|
|
|
|
|
447
|
|
|
|
|
|
|
ParaDNS::Resolver - an asynchronous DNS resolver class |
448
|
|
|
|
|
|
|
|
449
|
|
|
|
|
|
|
=head1 SYNOPSIS |
450
|
|
|
|
|
|
|
|
451
|
|
|
|
|
|
|
my $res = ParaDNS::Resolver->new(); |
452
|
|
|
|
|
|
|
|
453
|
|
|
|
|
|
|
$res->query($obj, @hosts); # $obj implements $obj->run_callback() |
454
|
|
|
|
|
|
|
|
455
|
|
|
|
|
|
|
=head1 DESCRIPTION |
456
|
|
|
|
|
|
|
|
457
|
|
|
|
|
|
|
This is a low level DNS resolver class that works within the Danga::Socket |
458
|
|
|
|
|
|
|
asynchronous I/O framework. Do not attempt to use this class standalone - use |
459
|
|
|
|
|
|
|
the C class instead. |
460
|
|
|
|
|
|
|
|
461
|
|
|
|
|
|
|
=cut |