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=head1 NAME
Net::SIP::Dropper - drops SIP messages based on callback
=head1 SYNOPSIS
use Net::SIP::Dropper::ByIPPort;
my $drop_by_ipport = Net::SIP::Dropper::ByIPPort->new(
database => '/path/to/database.drop',
methods => [ 'REGISTER', '...', '' ],
attempts => 10,
interval => 60,
);
use Net::SIP::Dropper::ByField;
my $drop_by_field = Net::SIP::Dropper::ByField->new(
methods => [ 'REGISTER', '...', '' ],
'From' => qr/sip(?:vicious|sscuser)/,
'User-Agent' => qr/^friendly-scanner$/,
);
my $drop_subscribe = sub {
my ($packet,$leg,$from) = @_;
# drop all subscribe requests and responses
return $packet->method eq 'SUBSCRIBE' ? 1:0;
};
my $dropper = Net::SIP::Dropper->new(
cbs => [ $drop_by_ipport, $drop_by_field, $drop_subscribe ]);
my $chain = Net::SIP::ReceiveChain->new(
[ $dropper, ... ]
);
=head1 DESCRIPTION
Drops messages. This means, does no further processing in the Net::SIP chain
and does not send something back if the incoming message match the
settings.
Some useful droppers are defined in L<Net::SIP::Dropper::ByIpPort> and
L<Net::SIP::Dropper::ByField>.
=head1 CONSTRUCTOR
=over 4
=item new ( ARGS )
ARGS is a hash with key C<cb> I<or> C<cbs>. C<cb> is a single callback to be
processed, C<cbs> is an arrayref with callbacks. If one of the callbacks returns
true the message will be dropped. If all callbacks return false the message will
be forwarded in the chain.
Returns a new dropper object to be used in the chain.
=back
=cut
use strict;
use warnings;
package Net::SIP::Dropper;
use fields qw( cbs );
use Carp 'croak';
use Net::SIP::Util qw( invoke_callback );
################################################################################
# creates new Dropper object
# Args: ($class,%args)
# %args:
# One of cb or cbs must be set.
# cb: A single callback. Will be ignored if cbs is also set.
# cbs: An arrayref with callbacks.
# Returns: Net::SIP::Dropper object
################################################################################
sub new {
my ($class, %args) = @_;
my Net::SIP::Dropper $self = fields::new($class);
croak('argument cb or cbs must exist') unless $args{cb} || $args{cbs};
$self->{cbs} = $args{cbs} || [ $args{cb} ];
return $self;
}
################################################################################
# Drops SIP-messages excluded by the settings
# Args: ($self,$packet,$leg,$from)
# args as usual for sub receive
# Returns: 1 (stop chain) | <undef> (proceed in chain)
################################################################################
sub receive {
my Net::SIP::Dropper $self = shift;
my ($packet, $leg, $from) = @_;
for (@{ $self->{cbs} }) {
return 1 if invoke_callback($_, $packet, $leg, $from);
}
return;
}
1;
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