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package Net::BitTorrent::Protocol::BEP23; |
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use strict; |
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use warnings; |
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use Carp qw[carp]; |
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our $VERSION = "1.5.1"; |
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use vars qw[@EXPORT_OK %EXPORT_TAGS]; |
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use Exporter qw[]; |
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*import = *import = *Exporter::import; |
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@EXPORT_OK = qw[compact_ipv4 uncompact_ipv4]; |
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%EXPORT_TAGS = (all => [@EXPORT_OK], bencode => [@EXPORT_OK]); |
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sub compact_ipv4 { |
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my (@peers) = @_; |
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my $return; |
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my %seen; |
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PEER: for my $peer (@peers) { |
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next if not $peer; |
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my ($ip, $port) = @$peer; |
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next if $seen{$ip . ':' . $port}++; |
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if ($ip |
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!~ m[^(?:(?:(?:25[0-5]|2[0-4][0-9]|[0-1]?[0-9]{1,2})[.]?){4})$]) |
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{ carp 'Invalid IPv4 address: ' . $ip; |
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} |
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elsif ($port > 2**16) { |
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carp 'Port number beyond ephemeral range: ' . $port; |
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} |
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else { |
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$return .= pack 'C4n', |
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($ip =~ m[^([\d]+)\.([\d]+)\.([\d]+)\.([\d]+)$]), |
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int $port; |
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} |
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} |
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return $return; |
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} |
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sub uncompact_ipv4 { |
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return $_[0] ? |
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map { |
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my (@h) = unpack 'C4n', $_; |
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[sprintf('%s.%s.%s.%s', @h), $h[-1]] |
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} $_[0] =~ m[(.{6})]g |
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: (); |
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} |
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1; |
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=pod |
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=head1 NAME |
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Net::BitTorrent::Protocol::BEP23 - Utility functions for BEP23: Tracker Returns Compact Peer Lists |
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=head1 Importing From Net::BitTorrent::Protocol::BEP23 |
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By default, nothing is exported. |
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You may import any of the following or use one or more of these tag: |
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=over |
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=item C<:all> |
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Imports the tracker response-related functions |
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L and |
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L. |
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=back |
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=head1 Functions |
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=over |
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=item C |
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Compacts a list of IPv4:port strings into a single string. |
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A compact peer is 6 bytes; the first four bytes are the host (in network byte |
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order), the last two bytes are the port (again, in network byte order). |
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=item C |
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Inflates a compacted string of peers and returns a list of IPv4:port strings. |
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=back |
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=head1 See Also |
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=over |
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=item BEP 23: Tracker Returns Compact Peer Lists |
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http://bittorrent.org/beps/bep_0023.html |
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=back |
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=head1 Author |
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Sanko Robinson - http://sankorobinson.com/ |
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CPAN ID: SANKO |
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101
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=head1 License and Legal |
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Copyright (C) 2008-2012 by Sanko Robinson |
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This program is free software; you can redistribute it and/or modify it under |
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the terms of |
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L. |
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See the F file included with this distribution or |
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L |
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for clarification. |
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112
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When separated from the distribution, all original POD documentation is |
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covered by the |
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L. |
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See the |
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L. |
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118
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Neither this module nor the L is affiliated with BitTorrent, |
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Inc. |
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121
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=cut |