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
/ );

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");

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

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

        warn "handler got ", length($chunk), " bytes\n" if $self->debug;

        warn "<<< " . localtime() . " " . $sock->peerhost . "\n";

        die "not SOAP request" unless defined ( $self->header('SOAPAction') );

        my $state;

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


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

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

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

        warn "### request over";

};

=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	30	/ );
13
14	dpavlin	40	use IO::Socket::INET;
15	dpavlin	30	use Data::Dump qw/dump/;
16	dpavlin	35	use CWMP::Request;
17			use CWMP::Response;
18	dpavlin	40	use Carp qw/confess cluck/;
19	dpavlin	30
20	dpavlin	34	=head1 NAME
21
22			CWMP::Server - implement logic of CWMP protocol
23
24			=head1 METHODS
25
26	dpavlin	40	=head2 new
27	dpavlin	34
28	dpavlin	40	my $server = CWMP::Server->new({ port => 3333 });
29	dpavlin	34
30	dpavlin	40	=head2 run
31
32			$server->run();
33
34	dpavlin	34	=cut
35
36	dpavlin	40	sub run {
37			my $self = shift;
38	dpavlin	30
39	dpavlin	40	my $listen = IO::Socket::INET->new(
40			Listen => 5,
41			# LocalAddr => 'localhost',
42			LocalPort => $self->port,
43			Proto => 'tcp',
44			Blocking => 1,
45			ReuseAddr => 1,
46			);
47
48			warn "waiting for request on port ", $self->port, $/;
49
50			while ( my $sock = $listen->accept ) {
51			$sock->autoflush(1);
52
53			warn "connection from ", $sock->peerhost, "\n";
54
55	dpavlin	41	$self->sock( $sock ); # FIXME this will not work for multiple clients
56	dpavlin	42	while ( $self->process_request ) {
57			warn "...another one bites a dust...\n";
58			}
59	dpavlin	40
60	dpavlin	42	warn "...returning to accepting new connections\n";
61	dpavlin	40	}
62			}
63
64	dpavlin	48	=head2 process_request
65
66			One request from client/response from server cycle. Call multiple times to
67			facilitate brain-dead concept of adding state to stateless protocol like
68			HTTP.
69
70			=cut
71
72	dpavlin	40	sub process_request {
73			my $self = shift;
74
75	dpavlin	42	my $sock = $self->sock \|\| die "no sock?";
76	dpavlin	40
77			die "not IO::Socket::INET but ", ref( $sock ) unless ( ref($sock) eq 'IO::Socket::INET' );
78
79	dpavlin	42	if ( ! $sock->connected ) {
80			warn "SOCKET NOT CONNECTED";
81			return 0;
82			}
83
84	dpavlin	40	$sock->autoflush( 1 );
85			$sock->blocking( 1 );
86
87			### read the first line of response
88	dpavlin	48	my $line = $sock->getline \|\| return $self->error(400, "No Data");
89	dpavlin	40
90			$line =~ s/[\r\n]+$//;
91			if ($line !~ /^ (\w+) \ + (\S+) \ + (HTTP\/1.\d) $ /x) {
92			return $self->error(400, "Bad request");
93			}
94			my ($method, $req, $protocol) = ($1, $2, $3);
95			warn "<<<< ",join(" ", time, $method, $req)."\n";
96
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	40	warn "get chunk len\n" if $self->debug;
116
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	40	warn "getting chunk of $len bytes\n" if $self->debug;
127	dpavlin	30
128	dpavlin	40	$sock->read( my $buff, $len );
129			$chunk .= $buff;
130	dpavlin	30
131	dpavlin	40	warn "--- $len bytes: --=>\|\|$buff\|\|<=--\n";
132	dpavlin	30
133	dpavlin	40	} while ( $len > 0 );
134	dpavlin	30
135	dpavlin	40	} else {
136			die "right now, we support only Transfer-Encoding: chunked";
137			}
138	dpavlin	34
139	dpavlin	40	warn "handler got ", length($chunk), " bytes\n" if $self->debug;
140	dpavlin	34
141	dpavlin	40	warn "<<< " . localtime() . " " . $sock->peerhost . "\n";
142	dpavlin	34
143	dpavlin	40	die "not SOAP request" unless defined ( $self->header('SOAPAction') );
144	dpavlin	30
145	dpavlin	36	my $state;
146
147	dpavlin	40	if ( $chunk ) {
148			warn "## request chunk: ",length($chunk)," bytes\n$chunk\n" if $self->debug;
149	dpavlin	30
150	dpavlin	40	$state = CWMP::Request->parse( $chunk );
151	dpavlin	34
152	dpavlin	40	warn "acquired state = ", dump( $state ), "\n";
153	dpavlin	34
154	dpavlin	36	} else {
155			warn "empty request\n";
156	dpavlin	34	}
157
158	dpavlin	40
159	dpavlin	35	my $response = CWMP::Response->new({ debug => $self->debug });
160	dpavlin	34
161	dpavlin	44	$sock->send(join("\r\n",
162			'HTTP/1.1 200 OK',
163			'Content-Type: text/xml; charset="utf-8"',
164			'Server: AcmeCWMP/42',
165			'SOAPServer: AcmeCWMP/42',
166	dpavlin	43	));
167	dpavlin	30
168	dpavlin	43	$sock->send( "Set-Cookie: ID=" . $state->{ID} . "; path=/\r\n" ) if ( $state->{ID} );
169	dpavlin	40
170			my $xml = '';
171
172	dpavlin	36	if ( my $dispatch = $state->{_dispatch} ) {
173			if ( $response->can( $dispatch ) ) {
174			warn ">>> dispatching to $dispatch\n";
175	dpavlin	40	$xml = $response->$dispatch( $state ) . "\r\n";
176			warn "## response payload: ",length($xml)," bytes\n$xml\n";
177	dpavlin	36	} else {
178			confess "can't dispatch to $dispatch";
179			}
180			} else {
181			warn ">>> empty response\n";
182			}
183	dpavlin	40
184	dpavlin	43	$sock->send( "Content-Length: " . length( $xml ) . "\r\n\r\n" );
185	dpavlin	44	$sock->send( $xml ) or die "can't send response";
186	dpavlin	40
187			warn "### request over";
188
189	dpavlin	30	};
190
191	dpavlin	48	=head2 read_headers
192	dpavlin	40
193	dpavlin	48	parse headers from request
194
195			=cut
196
197	dpavlin	40	sub read_headers {
198			my $self = shift;
199
200			$self->{headers} = {};
201
202	dpavlin	42	while (defined($_ = $self->sock->getline)) {
203	dpavlin	40	s/[\r\n]+$//;
204			last unless length $_;
205			warn "-- $_\n";
206			return 0 if ! /^ ([\w\-]+) :[\ \t]* (.*) $/x;
207			$self->{headers}->{$1} = $2;
208			}
209
210			return 1;
211			}
212
213	dpavlin	48	=head2 header
214
215			Getter for specific header
216
217			$self->header('Cookies');
218
219			=cut
220
221	dpavlin	40	sub header {
222			my $self = shift;
223			my $header = shift \|\| die "no header?";
224			if ( defined( $self->{headers}->{$header} )) {
225			return $self->{headers}->{$header};
226			} else {
227			return;
228			}
229			}
230
231	dpavlin	48	=head2 error
232
233			return $self->error( 501, 'System error' );
234
235			=cut
236
237	dpavlin	44	sub error {
238	dpavlin	40	my ($self, $number, $msg) = @_;
239	dpavlin	44	$msg \|\|= 'ERROR';
240			$self->sock->send( "HTTP/1.1 $number $msg\r\n" );
241	dpavlin	40	warn "Error - $number - $msg\n";
242	dpavlin	48	return 0; # close connection
243	dpavlin	40	}
244
245	dpavlin	30	1;