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
/ );

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";
        }

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