lib/CWMP/Session.pm

# Dobrica Pavlinusic, <dpavlin@rot13.org> 06/18/07 10:19:50 CEST
package CWMP::Server;

use strict;
use warnings;

use base qw/Class::Accessor/;
__PACKAGE__->mk_accessors( qw/
debug
port
sock
state
queue
/ );

use IO::Socket::INET;
use Data::Dump qw/dump/;
use CWMP::Request;
use CWMP::Response;
use Carp qw/confess cluck/;

=head1 NAME

CWMP::Server - implement logic of CWMP protocol

=head1 METHODS

=head2 new

  my $server = CWMP::Server->new({ port => 3333 });

=head2 run

  $server->run();

=cut

sub run {
        my $self = shift;

        my $listen = IO::Socket::INET->new(
                Listen    => 5,
#               LocalAddr => 'localhost',
                LocalPort => $self->port,
                Proto     => 'tcp',
                Blocking  => 1,
                ReuseAddr => 1,
        );

        warn "waiting for request on port ", $self->port, $/;

        while ( my $sock = $listen->accept ) {
                $sock->autoflush(1);

                warn "connection from ", $sock->peerhost, "\n";

                $self->sock( $sock );   # FIXME this will not work for multiple clients
                while ( $self->process_request ) {
                        warn "...another one bites a dust...\n";
                }

                warn "...returning to accepting new connections\n";
        }
}

=head2 process_request

One request from client/response from server cycle. Call multiple times to
facilitate brain-dead concept of adding state to stateless protocol like
HTTP.

=cut

sub process_request {
        my $self = shift;

        my $sock = $self->sock || die "no sock?";

        die "not IO::Socket::INET but ", ref( $sock ) unless ( ref($sock) eq 'IO::Socket::INET' );

        if ( ! $sock->connected ) {
                warn "SOCKET NOT CONNECTED";
                return 0;
        }

        $sock->autoflush( 1 );
        $sock->blocking( 1 );

        ### read the first line of response
        my $line = $sock->getline;
        return $self->error(400, "No Data") unless ( defined $line );

        $line =~ s/[\r\n]+$//;
        if ($line !~ /^ (\w+) \ + (\S+) \ + (HTTP\/1.\d) $ /x) {
                warn "ERROR: $line\n";
                return $self->error(400, "Bad request");
        }
        my ($method, $req, $protocol) = ($1, $2, $3);
        warn "<<<< ", $sock->peerhost, " - - [" . localtime() . "] \"$method $req $protocol\"\n";

        ### read in other headers
        $self->read_headers || return $self->error(400, "Strange headers");

        ### do we support the type
#       if ($method !~ /GET|POST|HEAD/) {
        if ($method !~ /POST/) {
                return $self->error(400, "Unsupported Method");
        }

    my $chunk;
        my $transfer_encoding = $self->header('Transfer-Encoding');

        if ( $transfer_encoding && $transfer_encoding =~ qr/^chunked/i ) {

                my $len = 0;

                do {

                        warn "get chunk len\n" if $self->debug;
                        
                        my $hex;
                        do {
                                $hex = $sock->getline;
                                $hex =~ s/[\n\r]+$//;
                        } until ( $hex ne '' );

                        die "chunk size not valid hex: $hex" unless ( $hex =~ m/^[0-9a-f]+$/i);
                        $len = hex( $hex );

                        warn "getting chunk of $len bytes\n" if $self->debug;

                        $sock->read( my $buff, $len );
                        $chunk .= $buff;

                        warn "--- $len bytes: --=>||$buff||<=--\n";

                } while ( $len > 0 );
                my $sep = $sock->getline;
                die "expected separator, not ", dump( $sep ) if ( $sep !~ m/^[\n\r]+$/ );

        } else {
                die "right now, we support only Transfer-Encoding: chunked";
        }

        my $size = length( $chunk );

        warn "<<< " . $sock->peerhost . " [" . localtime() . "] request $size bytes\n";

        my $state;

        if ( $size > 0 ) {

                die "no SOAPAction header in ",dump($chunk) unless defined ( $self->header('SOAPAction') );


                if ( $chunk ) {
                        warn "## request chunk: ",length($chunk)," bytes\n$chunk\n" if $self->debug;

                        $state = CWMP::Request->parse( $chunk );

                        warn "acquired state = ", dump( $state ), "\n";

                        $self->state( $state );

                } else {
                        warn "empty request\n";
                }

        } else {
                $state = $self->state;
                warn "last request state = ", dump( $state ), "\n";
        }


        $sock->send(join("\r\n",
                'HTTP/1.1 200 OK',
                'Content-Type: text/xml; charset="utf-8"',
                'Server: AcmeCWMP/42',
                'SOAPServer: AcmeCWMP/42'
        ));

        $sock->send( "Set-Cookie: ID=" . $state->{ID} . "; path=/\r\n" ) if ( $state->{ID} );
        
        my $xml = '';

        if ( my $dispatch = $state->{_dispatch} ) {
                $xml = $self->dispatch( $dispatch );
        } elsif ( $dispatch = shift @{ $self->queue } ) {
                $xml = $self->dispatch( $dispatch );
        } elsif ( $size == 0 ) {
                warn ">>> closing connection\n";
                return 0;
        } else {
                warn ">>> empty response\n";
                $state->{NoMoreRequests} = 1;
                $xml = $self->dispatch( 'xml', sub {} );
        }

        $sock->send( "Content-Length: " . length( $xml ) . "\r\n\r\n" );
        $sock->send( $xml ) or die "can't send response";

        warn "### request over";

};

=head2 dispatch

  $xml = $self->dispatch('Inform', $response_arguments );

=cut

sub dispatch {
        my $self = shift;

        my $dispatch = shift || die "no dispatch?";

        my $response = CWMP::Response->new({ debug => $self->debug });

        if ( $response->can( $dispatch ) ) {
                warn ">>> dispatching to $dispatch\n";
                my $xml = $response->$dispatch( $self->state, @_ ) . "\r\n";
                warn "## response payload: ",length($xml)," bytes\n$xml\n";
                return $xml;
        } else {
                confess "can't dispatch to $dispatch";
        }
};

=head2 read_headers

parse headers from request

=cut

sub read_headers {
  my $self = shift;

  $self->{headers} = {};

  while (defined($_ = $self->sock->getline)) {
    s/[\r\n]+$//;
    last unless length $_;
        warn "-- $_\n";
    return 0 if ! /^ ([\w\-]+) :[\ \t]* (.*) $/x;
    $self->{headers}->{$1} = $2;
  }

  return 1;
}

=head2 header

Getter for specific header

  $self->header('Cookies');

=cut

sub header {
        my $self = shift;
        my $header = shift || die "no header?";
        if ( defined( $self->{headers}->{$header} )) {
                return $self->{headers}->{$header};
        } else {
                return;
        }
}

=head2 error

  return $self->error( 501, 'System error' );

=cut

sub error {
  my ($self, $number, $msg) = @_;
  $msg ||= 'ERROR';
  $self->sock->send( "HTTP/1.1 $number $msg\r\n" );
  warn "Error - $number - $msg\n";
  return 0;     # close connection
}

1;
1	dpavlin	30	# Dobrica Pavlinusic, <dpavlin@rot13.org> 06/18/07 10:19:50 CEST
2			package CWMP::Server;
3
4			use strict;
5			use warnings;
6
7	dpavlin	40	use base qw/Class::Accessor/;
8	dpavlin	30	__PACKAGE__->mk_accessors( qw/
9			debug
10	dpavlin	40	port
11	dpavlin	41	sock
12	dpavlin	49	state
13	dpavlin	50	queue
14	dpavlin	30	/ );
15
16	dpavlin	40	use IO::Socket::INET;
17	dpavlin	30	use Data::Dump qw/dump/;
18	dpavlin	35	use CWMP::Request;
19			use CWMP::Response;
20	dpavlin	40	use Carp qw/confess cluck/;
21	dpavlin	30
22	dpavlin	34	=head1 NAME
23
24			CWMP::Server - implement logic of CWMP protocol
25
26			=head1 METHODS
27
28	dpavlin	40	=head2 new
29	dpavlin	34
30	dpavlin	40	my $server = CWMP::Server->new({ port => 3333 });
31	dpavlin	34
32	dpavlin	40	=head2 run
33
34			$server->run();
35
36	dpavlin	34	=cut
37
38	dpavlin	40	sub run {
39			my $self = shift;
40	dpavlin	30
41	dpavlin	40	my $listen = IO::Socket::INET->new(
42			Listen => 5,
43			# LocalAddr => 'localhost',
44			LocalPort => $self->port,
45			Proto => 'tcp',
46			Blocking => 1,
47			ReuseAddr => 1,
48			);
49
50			warn "waiting for request on port ", $self->port, $/;
51
52			while ( my $sock = $listen->accept ) {
53			$sock->autoflush(1);
54
55			warn "connection from ", $sock->peerhost, "\n";
56
57	dpavlin	41	$self->sock( $sock ); # FIXME this will not work for multiple clients
58	dpavlin	42	while ( $self->process_request ) {
59			warn "...another one bites a dust...\n";
60			}
61	dpavlin	40
62	dpavlin	42	warn "...returning to accepting new connections\n";
63	dpavlin	40	}
64			}
65
66	dpavlin	48	=head2 process_request
67
68			One request from client/response from server cycle. Call multiple times to
69			facilitate brain-dead concept of adding state to stateless protocol like
70			HTTP.
71
72			=cut
73
74	dpavlin	40	sub process_request {
75			my $self = shift;
76
77	dpavlin	42	my $sock = $self->sock \|\| die "no sock?";
78	dpavlin	40
79			die "not IO::Socket::INET but ", ref( $sock ) unless ( ref($sock) eq 'IO::Socket::INET' );
80
81	dpavlin	42	if ( ! $sock->connected ) {
82			warn "SOCKET NOT CONNECTED";
83			return 0;
84			}
85
86	dpavlin	40	$sock->autoflush( 1 );
87			$sock->blocking( 1 );
88
89			### read the first line of response
90	dpavlin	49	my $line = $sock->getline;
91			return $self->error(400, "No Data") unless ( defined $line );
92	dpavlin	40
93			$line =~ s/[\r\n]+$//;
94			if ($line !~ /^ (\w+) \ + (\S+) \ + (HTTP\/1.\d) $ /x) {
95	dpavlin	49	warn "ERROR: $line\n";
96	dpavlin	40	return $self->error(400, "Bad request");
97			}
98			my ($method, $req, $protocol) = ($1, $2, $3);
99	dpavlin	49	warn "<<<< ", $sock->peerhost, " - - [" . localtime() . "] \"$method $req $protocol\"\n";
100	dpavlin	40
101			### read in other headers
102	dpavlin	42	$self->read_headers \|\| return $self->error(400, "Strange headers");
103	dpavlin	40
104			### do we support the type
105			# if ($method !~ /GET\|POST\|HEAD/) {
106			if ($method !~ /POST/) {
107			return $self->error(400, "Unsupported Method");
108			}
109
110	dpavlin	30	my $chunk;
111			my $transfer_encoding = $self->header('Transfer-Encoding');
112
113			if ( $transfer_encoding && $transfer_encoding =~ qr/^chunked/i ) {
114
115	dpavlin	31	my $len = 0;
116	dpavlin	40
117	dpavlin	30	do {
118
119	dpavlin	40	warn "get chunk len\n" if $self->debug;
120
121			my $hex;
122			do {
123			$hex = $sock->getline;
124			$hex =~ s/[\n\r]+$//;
125			} until ( $hex ne '' );
126	dpavlin	30
127	dpavlin	40	die "chunk size not valid hex: $hex" unless ( $hex =~ m/^[0-9a-f]+$/i);
128			$len = hex( $hex );
129	dpavlin	30
130	dpavlin	40	warn "getting chunk of $len bytes\n" if $self->debug;
131	dpavlin	30
132	dpavlin	40	$sock->read( my $buff, $len );
133			$chunk .= $buff;
134	dpavlin	30
135	dpavlin	40	warn "--- $len bytes: --=>\|\|$buff\|\|<=--\n";
136	dpavlin	30
137	dpavlin	40	} while ( $len > 0 );
138	dpavlin	49	my $sep = $sock->getline;
139			die "expected separator, not ", dump( $sep ) if ( $sep !~ m/^[\n\r]+$/ );
140	dpavlin	30
141	dpavlin	40	} else {
142			die "right now, we support only Transfer-Encoding: chunked";
143			}
144	dpavlin	34
145	dpavlin	49	my $size = length( $chunk );
146	dpavlin	34
147	dpavlin	49	warn "<<< " . $sock->peerhost . " [" . localtime() . "] request $size bytes\n";
148	dpavlin	34
149	dpavlin	36	my $state;
150
151	dpavlin	49	if ( $size > 0 ) {
152	dpavlin	30
153	dpavlin	49	die "no SOAPAction header in ",dump($chunk) unless defined ( $self->header('SOAPAction') );
154	dpavlin	34
155	dpavlin	49
156			if ( $chunk ) {
157			warn "## request chunk: ",length($chunk)," bytes\n$chunk\n" if $self->debug;
158
159			$state = CWMP::Request->parse( $chunk );
160
161			warn "acquired state = ", dump( $state ), "\n";
162
163			$self->state( $state );
164
165			} else {
166			warn "empty request\n";
167			}
168
169	dpavlin	36	} else {
170	dpavlin	49	$state = $self->state;
171			warn "last request state = ", dump( $state ), "\n";
172	dpavlin	34	}
173
174
175	dpavlin	44	$sock->send(join("\r\n",
176			'HTTP/1.1 200 OK',
177			'Content-Type: text/xml; charset="utf-8"',
178			'Server: AcmeCWMP/42',
179	dpavlin	49	'SOAPServer: AcmeCWMP/42'
180	dpavlin	43	));
181	dpavlin	30
182	dpavlin	43	$sock->send( "Set-Cookie: ID=" . $state->{ID} . "; path=/\r\n" ) if ( $state->{ID} );
183	dpavlin	40
184			my $xml = '';
185
186	dpavlin	36	if ( my $dispatch = $state->{_dispatch} ) {
187	dpavlin	50	$xml = $self->dispatch( $dispatch );
188			} elsif ( $dispatch = shift @{ $self->queue } ) {
189			$xml = $self->dispatch( $dispatch );
190			} elsif ( $size == 0 ) {
191			warn ">>> closing connection\n";
192			return 0;
193	dpavlin	36	} else {
194			warn ">>> empty response\n";
195	dpavlin	50	$state->{NoMoreRequests} = 1;
196			$xml = $self->dispatch( 'xml', sub {} );
197	dpavlin	36	}
198	dpavlin	40
199	dpavlin	43	$sock->send( "Content-Length: " . length( $xml ) . "\r\n\r\n" );
200	dpavlin	44	$sock->send( $xml ) or die "can't send response";
201	dpavlin	40
202			warn "### request over";
203
204	dpavlin	30	};
205
206	dpavlin	50	=head2 dispatch
207
208			$xml = $self->dispatch('Inform', $response_arguments );
209
210			=cut
211
212			sub dispatch {
213			my $self = shift;
214
215			my $dispatch = shift \|\| die "no dispatch?";
216
217			my $response = CWMP::Response->new({ debug => $self->debug });
218
219			if ( $response->can( $dispatch ) ) {
220			warn ">>> dispatching to $dispatch\n";
221			my $xml = $response->$dispatch( $self->state, @_ ) . "\r\n";
222			warn "## response payload: ",length($xml)," bytes\n$xml\n";
223			return $xml;
224			} else {
225			confess "can't dispatch to $dispatch";
226			}
227			};
228
229	dpavlin	48	=head2 read_headers
230	dpavlin	40
231	dpavlin	48	parse headers from request
232
233			=cut
234
235	dpavlin	40	sub read_headers {
236			my $self = shift;
237
238			$self->{headers} = {};
239
240	dpavlin	42	while (defined($_ = $self->sock->getline)) {
241	dpavlin	40	s/[\r\n]+$//;
242			last unless length $_;
243			warn "-- $_\n";
244			return 0 if ! /^ ([\w\-]+) :[\ \t]* (.*) $/x;
245			$self->{headers}->{$1} = $2;
246			}
247
248			return 1;
249			}
250
251	dpavlin	48	=head2 header
252
253			Getter for specific header
254
255			$self->header('Cookies');
256
257			=cut
258
259	dpavlin	40	sub header {
260			my $self = shift;
261			my $header = shift \|\| die "no header?";
262			if ( defined( $self->{headers}->{$header} )) {
263			return $self->{headers}->{$header};
264			} else {
265			return;
266			}
267			}
268
269	dpavlin	48	=head2 error
270
271			return $self->error( 501, 'System error' );
272
273			=cut
274
275	dpavlin	44	sub error {
276	dpavlin	40	my ($self, $number, $msg) = @_;
277	dpavlin	44	$msg \|\|= 'ERROR';
278			$self->sock->send( "HTTP/1.1 $number $msg\r\n" );
279	dpavlin	40	warn "Error - $number - $msg\n";
280	dpavlin	48	return 0; # close connection
281	dpavlin	40	}
282
283	dpavlin	30	1;