lib/CWMP/Session.pm

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

use strict;
use warnings;

use base qw/Class::Accessor/;
__PACKAGE__->mk_accessors( qw/
debug
store_path

sock
state
queue
store
/ );

use IO::Socket::INET;
use Data::Dump qw/dump/;
use Carp qw/confess cluck croak/;

use CWMP::Request;
use CWMP::Response;
use CWMP::Store;

=head1 NAME

CWMP::Session - implement logic of CWMP protocol

=head1 METHODS

=head2 new

  my $server = CWMP::Session->new({
        sock => $io_socket_object,
        store_path => 'state.db',
        queue => [ qw/GetRPCMethods GetParameterNames/ ],
        debug => 1,
  });


=cut

sub new {
        my $class = shift;
        my $self = $class->SUPER::new( @_ );

        confess "need sock" unless $self->sock;

        warn "created ", __PACKAGE__, "(", dump( @_ ), ") for ", $self->sock->peerhost, "\n" if $self->debug;

        $self->store( CWMP::Store->new({
                debug => $self->debug,
                path => $self->store_path,
        }) );

        croak "can't open ", $self->store_path, ": $!" unless $self->store;

        return $self;
}

=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\n";
                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 > 1;
                        
                        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 > 1;

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

                        warn "--- $len bytes: --=>||$buff||<=--\n" if $self->debug > 1;

                } 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 );
                        $self->store->update_state( $state->{ID} => $state );

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

        } else {
                $state = $self->state;
                warn "last request state = ", dump( $state ), "\n" if $self->debug > 1;
        }


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

        $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 ">>>> " . $sock->peerhost . " [" . localtime() . "] sent ", length( $xml )," bytes\n";

        warn "### request over\n" if $self->debug;

        return 1;       # next request
};

=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( $self->state, @_ );
                warn "## response payload: ",length($xml)," bytes\n$xml\n" if $self->debug;
                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" if $self->debug;
    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	dpavlin	82	package CWMP::Session;
3	dpavlin	30
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	77	store_path
11
12	dpavlin	41	sock
13	dpavlin	49	state
14	dpavlin	50	queue
15	dpavlin	77	store
16	dpavlin	30	/ );
17
18	dpavlin	40	use IO::Socket::INET;
19	dpavlin	30	use Data::Dump qw/dump/;
20	dpavlin	77	use Carp qw/confess cluck croak/;
21
22	dpavlin	35	use CWMP::Request;
23			use CWMP::Response;
24	dpavlin	77	use CWMP::Store;
25	dpavlin	30
26	dpavlin	34	=head1 NAME
27
28	dpavlin	82	CWMP::Session - implement logic of CWMP protocol
29	dpavlin	34
30			=head1 METHODS
31
32	dpavlin	40	=head2 new
33	dpavlin	34
34	dpavlin	82	my $server = CWMP::Session->new({
35	dpavlin	83	sock => $io_socket_object,
36	dpavlin	77	store_path => 'state.db',
37	dpavlin	83	queue => [ qw/GetRPCMethods GetParameterNames/ ],
38	dpavlin	77	debug => 1,
39			});
40	dpavlin	34
41	dpavlin	40
42	dpavlin	34	=cut
43
44	dpavlin	83	sub new {
45			my $class = shift;
46			my $self = $class->SUPER::new( @_ );
47	dpavlin	30
48	dpavlin	83	confess "need sock" unless $self->sock;
49	dpavlin	40
50	dpavlin	83	warn "created ", __PACKAGE__, "(", dump( @_ ), ") for ", $self->sock->peerhost, "\n" if $self->debug;
51	dpavlin	40
52	dpavlin	77	$self->store( CWMP::Store->new({
53			debug => $self->debug,
54			path => $self->store_path,
55			}) );
56	dpavlin	83
57	dpavlin	77	croak "can't open ", $self->store_path, ": $!" unless $self->store;
58
59	dpavlin	83	return $self;
60	dpavlin	40	}
61
62	dpavlin	48	=head2 process_request
63
64			One request from client/response from server cycle. Call multiple times to
65			facilitate brain-dead concept of adding state to stateless protocol like
66			HTTP.
67
68			=cut
69
70	dpavlin	40	sub process_request {
71			my $self = shift;
72
73	dpavlin	42	my $sock = $self->sock \|\| die "no sock?";
74	dpavlin	40
75			die "not IO::Socket::INET but ", ref( $sock ) unless ( ref($sock) eq 'IO::Socket::INET' );
76
77	dpavlin	42	if ( ! $sock->connected ) {
78	dpavlin	53	warn "SOCKET NOT CONNECTED\n";
79	dpavlin	42	return 0;
80			}
81
82	dpavlin	40	$sock->autoflush( 1 );
83			$sock->blocking( 1 );
84
85			### read the first line of response
86	dpavlin	49	my $line = $sock->getline;
87			return $self->error(400, "No Data") unless ( defined $line );
88	dpavlin	40
89			$line =~ s/[\r\n]+$//;
90			if ($line !~ /^ (\w+) \ + (\S+) \ + (HTTP\/1.\d) $ /x) {
91	dpavlin	49	warn "ERROR: $line\n";
92	dpavlin	40	return $self->error(400, "Bad request");
93			}
94			my ($method, $req, $protocol) = ($1, $2, $3);
95	dpavlin	49	warn "<<<< ", $sock->peerhost, " - - [" . localtime() . "] \"$method $req $protocol\"\n";
96	dpavlin	40
97			### read in other headers
98	dpavlin	42	$self->read_headers \|\| return $self->error(400, "Strange headers");
99	dpavlin	40
100			### do we support the type
101			# if ($method !~ /GET\|POST\|HEAD/) {
102			if ($method !~ /POST/) {
103			return $self->error(400, "Unsupported Method");
104			}
105
106	dpavlin	30	my $chunk;
107			my $transfer_encoding = $self->header('Transfer-Encoding');
108
109			if ( $transfer_encoding && $transfer_encoding =~ qr/^chunked/i ) {
110
111	dpavlin	31	my $len = 0;
112	dpavlin	40
113	dpavlin	30	do {
114
115	dpavlin	67	warn "get chunk len\n" if $self->debug > 1;
116	dpavlin	40
117			my $hex;
118			do {
119			$hex = $sock->getline;
120			$hex =~ s/[\n\r]+$//;
121			} until ( $hex ne '' );
122	dpavlin	30
123	dpavlin	40	die "chunk size not valid hex: $hex" unless ( $hex =~ m/^[0-9a-f]+$/i);
124			$len = hex( $hex );
125	dpavlin	30
126	dpavlin	67	warn "getting chunk of $len bytes\n" if $self->debug > 1;
127	dpavlin	30
128	dpavlin	40	$sock->read( my $buff, $len );
129			$chunk .= $buff;
130	dpavlin	30
131	dpavlin	67	warn "--- $len bytes: --=>\|\|$buff\|\|<=--\n" if $self->debug > 1;
132	dpavlin	30
133	dpavlin	40	} while ( $len > 0 );
134	dpavlin	49	my $sep = $sock->getline;
135			die "expected separator, not ", dump( $sep ) if ( $sep !~ m/^[\n\r]+$/ );
136	dpavlin	30
137	dpavlin	40	} else {
138			die "right now, we support only Transfer-Encoding: chunked";
139			}
140	dpavlin	34
141	dpavlin	49	my $size = length( $chunk );
142	dpavlin	34
143	dpavlin	72	warn "<<<< " . $sock->peerhost . " [" . localtime() . "] request $size bytes\n";
144	dpavlin	34
145	dpavlin	36	my $state;
146
147	dpavlin	49	if ( $size > 0 ) {
148	dpavlin	30
149	dpavlin	49	die "no SOAPAction header in ",dump($chunk) unless defined ( $self->header('SOAPAction') );
150	dpavlin	34
151	dpavlin	49
152			if ( $chunk ) {
153			warn "## request chunk: ",length($chunk)," bytes\n$chunk\n" if $self->debug;
154
155			$state = CWMP::Request->parse( $chunk );
156
157	dpavlin	70	warn "## acquired state = ", dump( $state ), "\n";
158	dpavlin	49
159			$self->state( $state );
160	dpavlin	79	$self->store->update_state( $state->{ID} => $state );
161	dpavlin	49
162			} else {
163	dpavlin	70	warn "## empty request\n";
164	dpavlin	49	}
165
166	dpavlin	36	} else {
167	dpavlin	49	$state = $self->state;
168	dpavlin	67	warn "last request state = ", dump( $state ), "\n" if $self->debug > 1;
169	dpavlin	34	}
170
171
172	dpavlin	44	$sock->send(join("\r\n",
173			'HTTP/1.1 200 OK',
174			'Content-Type: text/xml; charset="utf-8"',
175			'Server: AcmeCWMP/42',
176	dpavlin	49	'SOAPServer: AcmeCWMP/42'
177	dpavlin	54	)."\r\n");
178	dpavlin	30
179	dpavlin	43	$sock->send( "Set-Cookie: ID=" . $state->{ID} . "; path=/\r\n" ) if ( $state->{ID} );
180	dpavlin	40
181			my $xml = '';
182
183	dpavlin	36	if ( my $dispatch = $state->{_dispatch} ) {
184	dpavlin	50	$xml = $self->dispatch( $dispatch );
185			} elsif ( $dispatch = shift @{ $self->queue } ) {
186			$xml = $self->dispatch( $dispatch );
187			} elsif ( $size == 0 ) {
188			warn ">>> closing connection\n";
189			return 0;
190	dpavlin	36	} else {
191			warn ">>> empty response\n";
192	dpavlin	50	$state->{NoMoreRequests} = 1;
193			$xml = $self->dispatch( 'xml', sub {} );
194	dpavlin	36	}
195	dpavlin	40
196	dpavlin	43	$sock->send( "Content-Length: " . length( $xml ) . "\r\n\r\n" );
197	dpavlin	44	$sock->send( $xml ) or die "can't send response";
198	dpavlin	40
199	dpavlin	72	warn ">>>> " . $sock->peerhost . " [" . localtime() . "] sent ", length( $xml )," bytes\n";
200
201	dpavlin	70	warn "### request over\n" if $self->debug;
202	dpavlin	40
203	dpavlin	72	return 1; # next request
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	dpavlin	72	my $xml = $response->$dispatch( $self->state, @_ );
222	dpavlin	53	warn "## response payload: ",length($xml)," bytes\n$xml\n" if $self->debug;
223	dpavlin	50	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	dpavlin	53	warn "-- $_\n" if $self->debug;
244	dpavlin	40	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;