Net-Knuddels/Net/Knuddels.pm

=head1 NAME

Net::Knuddels - www.knuddels.de protocol implementation.

=head1 SYNOPSIS

 use Net::Knuddels;

=head1 DESCRIPTION

RTSL.

=cut

package Net::Knuddels;

use Net::Knuddels::Dictionary;

use strict;
use utf8;

use Carp;
use Math::BigInt;

sub hash_pw($$) {
   my ($challenge, $pw) = @_;

   my $l1 = length $pw;
   my $l2 = length $challenge;

   my $k = chr ($l1 ^ ($l2 << 4));

   my $l = $l1 < $l2 ? $l2 : $l1;

   my $xor = substr +($pw x 100) ^ ($challenge x 100) ^ ($k x 100), 0, $l;

   my ($i, $j);

   --$l;

   if ($l <= 17) {
      for (0 .. $l) {
         $i = $i * 3 + ord substr $xor, $l - $_;
         $j = $j * 5 + ord substr $xor, $_;

         $i = unpack "l", pack "L", (new Math::BigInt $i) & 0xffffffff;
         $j = unpack "l", pack "L", (new Math::BigInt $j) & 0xffffffff;
      }
   } else {
      for ($_ = $l; $_ >= 0; $_ -= int $_/19) {
         $i = $i * 5 + ord substr $xor, $_;
         $j = $j * 3 + ord substr $xor, $l - $_;

         $i = unpack "l", pack "L", (new Math::BigInt $i) & 0xffffffff;
         $j = unpack "l", pack "L", (new Math::BigInt $j) & 0xffffffff;
      }
   }

   $i ^= $j;

   ($i & 0xffffff) ^ ($i >> 24);
}

=head2 CLASS Net::Knuddels::Protocol

You B<must> call the C<destroy> method of this class when you no longer
use it, as circular references will keep the object alive otherwise.

=over 4

=cut

package Net::Knuddels::Protocol;

=item new

Create a new C<Net::Knuddels::Protocol> object.

=cut

sub new {
   my $class = shift;

   my %data;

   my $self = bless {
      @_
   }, $class;

   $self->register ("(" => sub {
      $self->{login_challenge} = $_[1];
      $self->{login_room}      = $_[2];
      $self->feed_event ("login_info");
   });

   $self;
}

=item $protocol->feed_data ($octets)

Feed raw protocol data into the decoder.

=cut

sub feed_data($$) {
   my ($self, $data) = @_;

   # split data stream into packets

   $data = "$self->{rbuf}$data";

   while () {
      1 <= length $data or last;
      my $len = ord substr $data, 0, 1;

      my $skip;
      if ($len & 0x80) {
         my $tail = (($len >> 5) & 3) - 1;
         $len = ($len & 0x1f) + 1;

         $tail < length $data or last;
         $len += (ord substr $data, $_ + 1, 1) << ($_ * 8 + 5)
            for 0 .. $tail;

         $skip = 2 + $tail;
      } else {
         $skip = 1;
         $len++;
      }

      $len + $skip <= length $data or last;
      substr $data, 0, $skip, "";
      my $msg = substr $data, 0, $len, "";

      $self->feed_msg ($msg);
   }

   $self->{rbuf} = $data;
}

my $RE_dec = join "|", keys %$Net::Knuddels::Dictionary;

sub feed_msg($$) {
   my ($self, $msg) = @_;

   my $bin = unpack "b*", $msg;
   my $res = "";

   while ($bin =~ /\G($RE_dec)/cmog) {
      my $frag = $Net::Knuddels::Dictionary->{$1};
      $frag = pack "b*", $bin =~ /\G.{16}/cmg && $1 if $frag eq "\\\\\\";
      $res .= $frag;
   }
   $bin =~ /\G(.*[^0].*)$/ and die "Net::Knuddels::Receiver: undecodable message tail '$1'";

   $self->feed_event (split /\0/, $res);
}

sub feed_event($@) {
   my ($self, $type, @arg) = @_;

   for ($type, "ALL") {
      my $ev = $self->{cb}{$_};
      $_->($type, @arg) for values %$ev;
   }
}

=item $protocol->register ($type => $callback)

Register a callback for events of type C<$type>, which is either the name
of a low-level event sent by the server (such as "k" for dialog box) or
the name of a generated event, such as C<login_info>.

=cut

sub register {
   my ($self, $type, $cb) = @_;

   $self->{cb}{$type}{$cb} = $cb;
}

=item $protocol->destroy

I<MUST> be called to destroy teh object, otherwise it will leak (no automatic cleanup).

=cut

sub destroy {
   my ($self) = @_;

   delete $self->{cb};
}

=back

=head2 CLASS Net::Knuddels::Client

=over 4

=cut

package Net::Knuddels::Client;

=back

=head1 AUTHOR

 Marc Lehmann <pcg@goof.com>
 http://home.schmorp.de/
  
=cut

1;

Revision:	1.8
Committed:	Wed Jan 12 20:37:07 2005 UTC (21 years, 10 months ago) by root
Branch:	MAIN
Changes since 1.7:	+43 -6 lines
Log Message:	* empty log message *
#	User	Rev	Content
1	root	1.8	=head1 NAME
2
3			Net::Knuddels - www.knuddels.de protocol implementation.
4
5			=head1 SYNOPSIS
6
7			use Net::Knuddels;
8
9			=head1 DESCRIPTION
10
11			RTSL.
12
13			=cut
14
15	root	1.1	package Net::Knuddels;
16
17	root	1.3	use Net::Knuddels::Dictionary;
18
19	root	1.2	use strict;
20			use utf8;
21
22	root	1.4	use Carp;
23			use Math::BigInt;
24
25			sub hash_pw($$) {
26			my ($challenge, $pw) = @_;
27
28			my $l1 = length $pw;
29			my $l2 = length $challenge;
30
31			my $k = chr ($l1 ^ ($l2 << 4));
32
33			my $l = $l1 < $l2 ? $l2 : $l1;
34
35			my $xor = substr +($pw x 100) ^ ($challenge x 100) ^ ($k x 100), 0, $l;
36
37			my ($i, $j);
38
39			--$l;
40
41			if ($l <= 17) {
42			for (0 .. $l) {
43			$i = $i * 3 + ord substr $xor, $l - $_;
44			$j = $j * 5 + ord substr $xor, $_;
45
46			$i = unpack "l", pack "L", (new Math::BigInt $i) & 0xffffffff;
47			$j = unpack "l", pack "L", (new Math::BigInt $j) & 0xffffffff;
48			}
49			} else {
50			for ($_ = $l; $_ >= 0; $_ -= int $_/19) {
51			$i = $i * 5 + ord substr $xor, $_;
52			$j = $j * 3 + ord substr $xor, $l - $_;
53
54			$i = unpack "l", pack "L", (new Math::BigInt $i) & 0xffffffff;
55			$j = unpack "l", pack "L", (new Math::BigInt $j) & 0xffffffff;
56			}
57			}
58
59			$i ^= $j;
60
61			($i & 0xffffff) ^ ($i >> 24);
62			}
63
64	root	1.5	=head2 CLASS Net::Knuddels::Protocol
65
66			You B<must> call the C<destroy> method of this class when you no longer
67			use it, as circular references will keep the object alive otherwise.
68
69	root	1.6	=over 4
70
71	root	1.8	=cut
72
73			package Net::Knuddels::Protocol;
74
75	root	1.6	=item new
76
77			Create a new C<Net::Knuddels::Protocol> object.
78
79	root	1.5	=cut
80	root	1.2
81			sub new {
82			my $class = shift;
83
84	root	1.4	my %data;
85
86			my $self = bless {
87			@_
88			}, $class;
89
90			$self->register ("(" => sub {
91	root	1.8	$self->{login_challenge} = $_[1];
92			$self->{login_room} = $_[2];
93			$self->feed_event ("login_info");
94	root	1.4	});
95
96			$self;
97	root	1.2	}
98
99	root	1.6	=item $protocol->feed_data ($octets)
100
101			Feed raw protocol data into the decoder.
102
103			=cut
104
105	root	1.2	sub feed_data($$) {
106			my ($self, $data) = @_;
107
108			# split data stream into packets
109
110			$data = "$self->{rbuf}$data";
111
112			while () {
113			1 <= length $data or last;
114			my $len = ord substr $data, 0, 1;
115
116			my $skip;
117			if ($len & 0x80) {
118			my $tail = (($len >> 5) & 3) - 1;
119			$len = ($len & 0x1f) + 1;
120
121			$tail < length $data or last;
122			$len += (ord substr $data, $_ + 1, 1) << ($_ * 8 + 5)
123			for 0 .. $tail;
124
125			$skip = 2 + $tail;
126			} else {
127			$skip = 1;
128			$len++;
129			}
130
131			$len + $skip <= length $data or last;
132			substr $data, 0, $skip, "";
133			my $msg = substr $data, 0, $len, "";
134
135			$self->feed_msg ($msg);
136			}
137
138			$self->{rbuf} = $data;
139			}
140
141	root	1.3	my $RE_dec = join "\|", keys %$Net::Knuddels::Dictionary;
142	root	1.1
143	root	1.2	sub feed_msg($$) {
144			my ($self, $msg) = @_;
145	root	1.1
146			my $bin = unpack "b*", $msg;
147			my $res = "";
148
149	root	1.2	while ($bin =~ /\G($RE_dec)/cmog) {
150	root	1.3	my $frag = $Net::Knuddels::Dictionary->{$1};
151	root	1.7	$frag = pack "b*", $bin =~ /\G.{16}/cmg && $1 if $frag eq "\\\\\\";
152	root	1.1	$res .= $frag;
153			}
154	root	1.2	$bin =~ /\G(.[^0].)$/ and die "Net::Knuddels::Receiver: undecodable message tail '$1'";
155
156			$self->feed_event (split /\0/, $res);
157	root	1.1	}
158
159	root	1.2	sub feed_event($@) {
160			my ($self, $type, @arg) = @_;
161	root	1.1
162	root	1.2	for ($type, "ALL") {
163			my $ev = $self->{cb}{$_};
164			$_->($type, @arg) for values %$ev;
165	root	1.1	}
166	root	1.2	}
167	root	1.1
168	root	1.6	=item $protocol->register ($type => $callback)
169
170			Register a callback for events of type C<$type>, which is either the name
171			of a low-level event sent by the server (such as "k" for dialog box) or
172	root	1.8	the name of a generated event, such as C<login_info>.
173	root	1.6
174			=cut
175
176	root	1.2	sub register {
177			my ($self, $type, $cb) = @_;
178	root	1.1
179	root	1.2	$self->{cb}{$type}{$cb} = $cb;
180	root	1.1	}
181
182	root	1.8	=item $protocol->destroy
183
184			I<MUST> be called to destroy teh object, otherwise it will leak (no automatic cleanup).
185
186			=cut
187
188	root	1.5	sub destroy {
189			my ($self) = @_;
190
191			delete $self->{cb};
192			}
193
194	root	1.6	=back
195
196	root	1.8	=head2 CLASS Net::Knuddels::Client
197
198			=over 4
199
200			=cut
201
202			package Net::Knuddels::Client;
203
204			=back
205
206			=head1 AUTHOR
207
208			Marc Lehmann <pcg@goof.com>
209			http://home.schmorp.de/
210
211	root	1.6	=cut
212
213	root	1.2	1;
214