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package Net::Knuddels; |
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|
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use Net::Knuddels::Dictionary; |
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|
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use strict; |
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use utf8; |
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|
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use Carp; |
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use Math::BigInt; |
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|
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sub hash_pw($$) { |
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my ($challenge, $pw) = @_; |
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|
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my $l1 = length $pw; |
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my $l2 = length $challenge; |
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|
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my $k = chr ($l1 ^ ($l2 << 4)); |
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|
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my $l = $l1 < $l2 ? $l2 : $l1; |
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|
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my $xor = substr +($pw x 100) ^ ($challenge x 100) ^ ($k x 100), 0, $l; |
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|
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my ($i, $j); |
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|
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--$l; |
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|
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if ($l <= 17) { |
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for (0 .. $l) { |
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$i = $i * 3 + ord substr $xor, $l - $_; |
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$j = $j * 5 + ord substr $xor, $_; |
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|
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$i = unpack "l", pack "L", (new Math::BigInt $i) & 0xffffffff; |
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$j = unpack "l", pack "L", (new Math::BigInt $j) & 0xffffffff; |
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} |
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} else { |
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for ($_ = $l; $_ >= 0; $_ -= int $_/19) { |
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$i = $i * 5 + ord substr $xor, $_; |
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$j = $j * 3 + ord substr $xor, $l - $_; |
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|
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$i = unpack "l", pack "L", (new Math::BigInt $i) & 0xffffffff; |
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$j = unpack "l", pack "L", (new Math::BigInt $j) & 0xffffffff; |
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} |
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} |
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|
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$i ^= $j; |
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|
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($i & 0xffffff) ^ ($i >> 24); |
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} |
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|
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package Net::Knuddels::Receiver; |
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|
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sub new { |
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my $class = shift; |
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|
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my %data; |
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|
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my $self = bless { |
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@_ |
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}, $class; |
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|
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$self->register ("(" => sub { |
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$self->{challenge} = $_[1]; |
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$self->{room} = $_[2]; |
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$self->feed_event ("connected"); |
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}); |
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|
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$self; |
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} |
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|
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sub feed_data($$) { |
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my ($self, $data) = @_; |
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|
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# split data stream into packets |
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|
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$data = "$self->{rbuf}$data"; |
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|
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while () { |
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1 <= length $data or last; |
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my $len = ord substr $data, 0, 1; |
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|
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my $skip; |
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if ($len & 0x80) { |
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my $tail = (($len >> 5) & 3) - 1; |
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$len = ($len & 0x1f) + 1; |
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|
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$tail < length $data or last; |
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$len += (ord substr $data, $_ + 1, 1) << ($_ * 8 + 5) |
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for 0 .. $tail; |
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|
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$skip = 2 + $tail; |
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} else { |
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$skip = 1; |
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$len++; |
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} |
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|
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$len + $skip <= length $data or last; |
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substr $data, 0, $skip, ""; |
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my $msg = substr $data, 0, $len, ""; |
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|
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$self->feed_msg ($msg); |
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} |
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|
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$self->{rbuf} = $data; |
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} |
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|
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my $RE_dec = join "|", keys %$Net::Knuddels::Dictionary; |
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|
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sub feed_msg($$) { |
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my ($self, $msg) = @_; |
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|
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my $bin = unpack "b*", $msg; |
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my $res = ""; |
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|
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while ($bin =~ /\G($RE_dec)/cmog) { |
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my $frag = $Net::Knuddels::Dictionary->{$1}; |
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$frag = pack "b*", substr $bin, 0, 16, "" if $frag eq "\\\\\\"; |
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$res .= $frag; |
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} |
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$bin =~ /\G(.*[^0].*)$/ and die "Net::Knuddels::Receiver: undecodable message tail '$1'"; |
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|
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$self->feed_event (split /\0/, $res); |
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} |
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|
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sub feed_event($@) { |
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my ($self, $type, @arg) = @_; |
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|
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for ($type, "ALL") { |
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my $ev = $self->{cb}{$_}; |
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$_->($type, @arg) for values %$ev; |
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} |
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} |
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|
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sub register { |
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my ($self, $type, $cb) = @_; |
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|
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$self->{cb}{$type}{$cb} = $cb; |
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} |
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|
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1; |
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