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package POE::Component::Client::NTP; |
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$POE::Component::Client::NTP::VERSION = '0.10'; |
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#ABSTRACT: A POE Component to query NTP servers |
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219376
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use strict; |
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59
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use warnings; |
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use Carp; |
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110
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use Socket qw[:all]; |
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2173
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1169
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use IO::Socket::IP; |
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9252
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2
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1639
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use POE; |
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our %MODE = ( |
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'0' => 'reserved', |
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'1' => 'symmetric active', |
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'2' => 'symmetric passive', |
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'3' => 'client', |
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'4' => 'server', |
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'5' => 'broadcast', |
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'6' => 'reserved for NTP control message', |
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'7' => 'reserved for private use' |
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); |
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our %STRATUM = ( |
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'0' => 'unspecified or unavailable', |
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'1' => 'primary reference (e.g., radio clock)', |
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); |
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for(2 .. 15){ |
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$STRATUM{$_} = 'secondary reference (via NTP or SNTP)'; |
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} |
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for(16 .. 255){ |
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$STRATUM{$_} = 'reserved'; |
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} |
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our %STRATUM_ONE_TEXT = ( |
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'LOCL' => 'uncalibrated local clock used as a primary reference for a subnet without external means of synchronization', |
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'PPS' => 'atomic clock or other pulse-per-second source individually calibrated to national standards', |
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'ACTS' => 'NIST dialup modem service', |
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'USNO' => 'USNO modem service', |
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'PTB' => 'PTB (Germany) modem service', |
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'TDF' => 'Allouis (France) Radio 164 kHz', |
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'DCF' => 'Mainflingen (Germany) Radio 77.5 kHz', |
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'MSF' => 'Rugby (UK) Radio 60 kHz', |
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'WWV' => 'Ft. Collins (US) Radio 2.5, 5, 10, 15, 20 MHz', |
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'WWVB' => 'Boulder (US) Radio 60 kHz', |
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'WWVH' => 'Kaui Hawaii (US) Radio 2.5, 5, 10, 15 MHz', |
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'CHU' => 'Ottawa (Canada) Radio 3330, 7335, 14670 kHz', |
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'LORC' => 'LORAN-C radionavigation system', |
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'OMEG' => 'OMEGA radionavigation system', |
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'GPS' => 'Global Positioning Service', |
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'GOES' => 'Geostationary Orbit Environment Satellite', |
53
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); |
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55
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our %LEAP_INDICATOR = ( |
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'0' => 'no warning', |
57
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'1' => 'last minute has 61 seconds', |
58
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'2' => 'last minute has 59 seconds)', |
59
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'3' => 'alarm condition (clock not synchronized)' |
60
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); |
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62
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{ |
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64
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2
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2
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836
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use constant NTP_ADJ => 2208988800; |
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4
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2
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2296
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65
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66
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my @ntp_packet_fields = |
67
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( |
68
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'Leap Indicator', |
69
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'Version Number', |
70
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'Mode', |
71
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'Stratum', |
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'Poll Interval', |
73
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'Precision', |
74
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'Root Delay', |
75
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'Root Dispersion', |
76
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'Reference Clock Identifier', |
77
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'Reference Timestamp', |
78
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'Originate Timestamp', |
79
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'Receive Timestamp', |
80
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'Transmit Timestamp', |
81
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); |
82
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83
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my $frac2bin = sub { |
84
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my $bin = ''; |
85
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my $frac = shift; |
86
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while ( length($bin) < 32 ) { |
87
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$bin = $bin . int( $frac * 2 ); |
88
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$frac = ( $frac * 2 ) - ( int( $frac * 2 ) ); |
89
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} |
90
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return $bin; |
91
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}; |
92
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93
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my $bin2frac = sub { |
94
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my @bin = split '', shift; |
95
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my $frac = 0; |
96
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while (@bin) { |
97
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$frac = ( $frac + pop @bin ) / 2; |
98
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} |
99
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return $frac; |
100
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}; |
101
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102
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my $percision = sub{ |
103
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my $number = shift; |
104
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if($number > 127){ |
105
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$number -= 255; |
106
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} |
107
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return sprintf("%1.4e", 2**$number); |
108
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}; |
109
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110
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my $unpack_ip = sub { |
111
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my $ip; |
112
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my $stratum = shift; |
113
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my $tmp_ip = shift; |
114
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if($stratum < 2){ |
115
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$ip = unpack("A4", |
116
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pack("H8", $tmp_ip) |
117
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); |
118
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}else{ |
119
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$ip = sprintf("%d.%d.%d.%d", |
120
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unpack("C4", |
121
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pack("H8", $tmp_ip) |
122
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) |
123
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); |
124
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} |
125
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return $ip; |
126
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}; |
127
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128
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sub get_ntp_response { |
129
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2
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2
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1
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457
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my $package = shift; |
130
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2
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9
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my %opts = @_; |
131
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2
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17
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$opts{lc $_} = delete $opts{$_} for keys %opts; |
132
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2
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50
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8
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croak "$package requires an 'event' argument\n" |
133
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unless $opts{event}; |
134
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2
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4
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my $options = delete $opts{options}; |
135
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2
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50
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5
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$opts{host} = 'localhost' unless $opts{host}; |
136
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2
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50
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33
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12
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$opts{port} = 123 unless $opts{port} and $opts{port} =~ /^\d+$/; |
137
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2
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6
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my $self = bless \%opts, $package; |
138
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2
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50
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43
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$self->{session_id} = POE::Session->create( |
139
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object_states => [ |
140
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$self => [qw(_start _socket _dispatch _get_datagram _timeout)], |
141
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], |
142
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heap => $self, |
143
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( ref($options) eq 'HASH' ? ( options => $options ) : () ), |
144
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)->ID(); |
145
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2
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170
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return $self; |
146
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} |
147
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148
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sub _start { |
149
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2
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2
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369
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my ($kernel,$sender,$self) = @_[KERNEL,SENDER,OBJECT]; |
150
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2
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8
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$self->{session_id} = $_[SESSION]->ID(); |
151
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2
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50
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33
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14
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if ( $kernel == $sender and !$self->{session} ) { |
152
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0
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0
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croak "Not called from another POE session and 'session' wasn't set\n"; |
153
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} |
154
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2
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2
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my $sender_id; |
155
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2
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50
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8
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if ( $self->{session} ) { |
156
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0
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0
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0
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if ( my $ref = $kernel->alias_resolve( $self->{session} ) ) { |
157
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0
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0
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$sender_id = $ref->ID(); |
158
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} |
159
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else { |
160
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0
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0
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croak "Could not resolve 'session' to a valid POE session\n"; |
161
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} |
162
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} |
163
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else { |
164
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2
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5
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$sender_id = $sender->ID(); |
165
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} |
166
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2
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12
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$kernel->refcount_increment( $sender_id, __PACKAGE__ ); |
167
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2
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63
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$self->{sender_id} = $sender_id; |
168
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2
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11
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$kernel->detach_myself(); |
169
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2
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208
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$kernel->yield('_socket'); |
170
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2
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145
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return; |
171
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} |
172
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173
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sub _socket { |
174
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2
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2
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581
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my ($kernel,$self) = @_[KERNEL,OBJECT]; |
175
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2
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20
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my $socket = IO::Socket::IP->new( Proto => 'udp' ); |
176
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2
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1212
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my $ai; |
177
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{ |
178
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2
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4
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my %hints = (socktype => SOCK_DGRAM, protocol => IPPROTO_UDP); |
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2
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6
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179
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2
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9281
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my ($err, @res) = getaddrinfo($self->{host}, $self->{port}, \%hints); |
180
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2
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50
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20
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if ( $err ) { |
181
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0
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0
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$self->{error} = $err; |
182
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0
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0
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$kernel->yield('_dispatch'); |
183
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0
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0
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return; |
184
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} |
185
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2
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10
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$ai = shift @res; |
186
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} |
187
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2
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10
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my $client_localtime = time(); |
188
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2
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5
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my $client_adj_localtime = $client_localtime + NTP_ADJ; |
189
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2
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8
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my $client_frac_localtime = $frac2bin->($client_adj_localtime); |
190
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191
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2
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23
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my $ntp_msg = |
192
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pack( "B8 C3 N10 B32", '00011011', (0) x 12, int($client_localtime), |
193
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$client_frac_localtime ); |
194
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195
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2
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17
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$socket->socket( $ai->{family}, $ai->{socktype}, $ai->{protocol} ); |
196
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2
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50
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288
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unless ( send( $socket, $ntp_msg, 0, $ai->{addr} ) == length($ntp_msg) ) { |
197
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0
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0
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$self->{error} = $!; |
198
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0
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0
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$kernel->yield('_dispatch'); |
199
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0
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0
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return; |
200
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|
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} |
201
|
2
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19
|
$kernel->select_read( $socket, '_get_datagram' ); |
202
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2
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|
100
|
|
|
281
|
$kernel->delay( '_timeout', ( $self->{timeout} || 60 ), $socket ); |
203
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2
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217
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return; |
204
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} |
205
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206
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sub _timeout { |
207
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1
|
|
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1
|
|
5005231
|
my ($kernel,$self,$socket) = @_[KERNEL,OBJECT,ARG0]; |
208
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1
|
|
|
|
|
6
|
$kernel->select_read( $socket ); |
209
|
1
|
|
|
|
|
187
|
$self->{error} = 'Socket timeout'; |
210
|
1
|
|
|
|
|
9
|
$kernel->yield('_dispatch'); |
211
|
1
|
|
|
|
|
99
|
return; |
212
|
|
|
|
|
|
|
} |
213
|
|
|
|
|
|
|
|
214
|
|
|
|
|
|
|
sub _get_datagram { |
215
|
1
|
|
|
1
|
|
15071
|
my ($kernel,$self,$socket) = @_[KERNEL,OBJECT,ARG0]; |
216
|
1
|
|
|
|
|
4
|
$kernel->delay( '_timeout' ); |
217
|
1
|
|
|
|
|
92
|
$kernel->select_read( $socket ); |
218
|
1
|
|
|
|
|
113
|
my $remote_address = recv( $socket, my $data = '', 960, 0 ); |
219
|
1
|
50
|
|
|
|
4
|
unless ( defined $remote_address ) { |
220
|
0
|
|
|
|
|
0
|
$self->{error} = $!; |
221
|
0
|
|
|
|
|
0
|
$kernel->yield('_dispatch'); |
222
|
0
|
|
|
|
|
0
|
return; |
223
|
|
|
|
|
|
|
} |
224
|
1
|
|
|
|
|
2
|
my %tmp_pkt; |
225
|
|
|
|
|
|
|
my %packet; |
226
|
1
|
|
|
|
|
3
|
my @ntp_fields = qw/byte1 stratum poll precision/; |
227
|
1
|
|
|
|
|
3
|
push @ntp_fields, qw/delay delay_fb disp disp_fb ident/; |
228
|
1
|
|
|
|
|
2
|
push @ntp_fields, qw/ref_time ref_time_fb/; |
229
|
1
|
|
|
|
|
3
|
push @ntp_fields, qw/org_time org_time_fb/; |
230
|
1
|
|
|
|
|
1
|
push @ntp_fields, qw/recv_time recv_time_fb/; |
231
|
1
|
|
|
|
|
2
|
push @ntp_fields, qw/trans_time trans_time_fb/; |
232
|
|
|
|
|
|
|
|
233
|
1
|
|
|
|
|
19
|
@tmp_pkt{@ntp_fields} = |
234
|
|
|
|
|
|
|
unpack( "a C3 n B16 n B16 H8 N B32 N B32 N B32 N B32", $data ); |
235
|
|
|
|
|
|
|
|
236
|
1
|
|
|
|
|
36
|
@packet{@ntp_packet_fields} = ( |
237
|
|
|
|
|
|
|
(unpack( "C", $tmp_pkt{byte1} & "\xC0" ) >> 6), |
238
|
|
|
|
|
|
|
(unpack( "C", $tmp_pkt{byte1} & "\x38" ) >> 3), |
239
|
|
|
|
|
|
|
(unpack( "C", $tmp_pkt{byte1} & "\x07" )), |
240
|
|
|
|
|
|
|
$tmp_pkt{stratum}, |
241
|
|
|
|
|
|
|
(sprintf("%0.4f", $tmp_pkt{poll})), |
242
|
|
|
|
|
|
|
$tmp_pkt{precision} - 255, |
243
|
|
|
|
|
|
|
($bin2frac->($tmp_pkt{delay_fb})), |
244
|
|
|
|
|
|
|
(sprintf("%0.4f", $tmp_pkt{disp})), |
245
|
|
|
|
|
|
|
$unpack_ip->($tmp_pkt{stratum}, $tmp_pkt{ident}), |
246
|
|
|
|
|
|
|
(($tmp_pkt{ref_time} += $bin2frac->($tmp_pkt{ref_time_fb})) -= NTP_ADJ), |
247
|
|
|
|
|
|
|
(($tmp_pkt{org_time} += $bin2frac->($tmp_pkt{org_time_fb})) ), |
248
|
|
|
|
|
|
|
(($tmp_pkt{recv_time} += $bin2frac->($tmp_pkt{recv_time_fb})) -= NTP_ADJ), |
249
|
|
|
|
|
|
|
(($tmp_pkt{trans_time} += $bin2frac->($tmp_pkt{trans_time_fb})) -= NTP_ADJ) |
250
|
|
|
|
|
|
|
); |
251
|
|
|
|
|
|
|
|
252
|
1
|
|
|
|
|
3
|
$self->{response} = \%packet; |
253
|
1
|
|
|
|
|
5
|
$kernel->yield('_dispatch'); |
254
|
1
|
|
|
|
|
66
|
return; |
255
|
|
|
|
|
|
|
} |
256
|
|
|
|
|
|
|
|
257
|
|
|
|
|
|
|
sub _dispatch { |
258
|
2
|
|
|
2
|
|
385
|
my ($kernel,$self) = @_[KERNEL,OBJECT]; |
259
|
2
|
|
|
|
|
5
|
my $data = { }; |
260
|
2
|
|
|
|
|
5
|
$data->{$_} = $self->{$_} for grep { defined $self->{$_} } qw(response error context host); |
|
8
|
|
|
|
|
37
|
|
261
|
2
|
|
|
|
|
13
|
$kernel->post( $self->{sender_id}, $self->{event}, $data ); |
262
|
2
|
|
|
|
|
188
|
$kernel->refcount_decrement( $self->{sender_id}, __PACKAGE__ ); |
263
|
2
|
|
|
|
|
80
|
return; |
264
|
|
|
|
|
|
|
} |
265
|
|
|
|
|
|
|
|
266
|
|
|
|
|
|
|
} |
267
|
|
|
|
|
|
|
|
268
|
|
|
|
|
|
|
'What is the time, Mr Wolf?'; |
269
|
|
|
|
|
|
|
|
270
|
|
|
|
|
|
|
__END__ |