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|
#!/usr/bin/perl
package POE::Component::ArpWatch;
use strict;
use POE;
use Pcap;
use NetPacket::Ethernet qw( :types );
use NetPacket::ARP qw( :opcodes );
## Map arp opcode #'s to strings
my %arp_opcodes = (
NetPacket::ARP::ARP_OPCODE_REQUEST, 'ARP Request',
NetPacket::ARP::ARP_OPCODE_REPLY, 'ARP Reply',
NetPacket::ARP::RARP_OPCODE_REQUEST, 'RARP Request',
NetPacket::ARP::RARP_OPCODE_REPLY, 'RARP Reply',
);
##
## POE::Component::ArpWatch->spawn(
## [ Alias => 'arp_watch' ],
## [ Device => 'eth0' ],
## [ Dispatch => dispatch_state ],
## [ Session => dispatch_session ],
## )
##
sub spawn {
my $class = shift;
my %args = @_;
$args{ Alias } ||= 'arp_watch';
POE::Session->create(
inline_states => {
_start => \&_start,
# _signal => \&_signal,
_stop => \&_stop,,
_dispatch => \&_dispatch,
set_dispatch => \&set_dispatch,
run => \&run,
pause => \&pause,
shutdown => \&shutdown,
},
args => [
$args{ Alias }, # ARG0
$args{ Device }, # ARG1
$args{ Dispatch },# ARG2
$args{ Session }, # ARG3
],
);
return $args{ Alias };
}
sub _start {
my ($kernel, $heap, $session,
$alias, $device, $target_state, $target_session )
= @_[ KERNEL, HEAP, SESSION, ARG0..ARG3 ];
POE::Component::Pcap->spawn(
Alias => $alias . '_pcap',
Device => $device,
Filter => 'arp',
Dispatch => '_dispatch',
Session => $session,
);
$heap->{'pcap_session'} = $kernel->alias_resolve( $alias . '_pcap' );
## Set alias for ourselves and remember it
$kernel->alias_set( $alias );
$heap->{Alias} = $alias;
## Set dispatch target session and state if it was given
if( defined( $target_session ) ) {
$heap->{'target_session'} = $target_session;
$heap->{'target_state'} = $target_state;
}
}
sub set_dispatch {
my( $heap, $sender, $target ) = @_[ HEAP, SENDER, ARG0 ];
if( defined $target ) {
## Remember whome to forward results to
$heap->{'target_session'} = $sender;
$heap->{'target_state'} = $target;
} else {
## Clear target
delete $heap->{'target_session'};
delete $heap->{'target_state'};
}
}
sub run {
$_[KERNEL]->post( $_[HEAP]->{'pcap_session'} => 'run' );
}
sub pause {
$_[KERNEL]->post( $_[HEAP]->{'pcap_session'} => 'pause' );
}
sub _dispatch {
my( $kernel, $heap, $packets ) =
@_[ KERNEL, HEAP, ARG0 ];
if( exists $heap->{'target_session'} ) {
$kernel->post( $heap->{'target_session'},
$heap->{'target_state'},
_process_packet( @{ $_ } ) ) foreach( @{$packets} );
}
}
sub _signal {
# print "Got signal ", $_[ARG0], "\n";
$_[KERNEL]->post( pcap => 'shutdown' );
return 1
}
sub shutdown {
my ( $kernel, $heap, $session, $sender )
= @_[ KERNEL, HEAP, SESSION, SENDER ];
my $alias = $heap->{Alias};
# print "In shutdown for sid ", $session->ID, ", alias $alias\n";
# print "shutdown by ", $sender->ID, "\n";
$kernel->post( $heap->{'pcap_session'} => 'shutdown' );
$kernel->alias_remove( $alias );
# print "Out shutdown for sid ", $session->ID, ", alias $alias\n";
}
sub _stop {
my ( $kernel, $heap, $session ) = @_[ KERNEL, HEAP, SESSION ];
my $alias = $heap->{Alias};
# print "In state_stop for sid ", $session->ID, ", alias $alias\n";
# print "Out state_stop for sid ", $session->ID, ", alias $alias\n";
}
sub _process_packet {
my( $hdr, $pkt ) = @_;
my $arp =
NetPacket::ARP->decode( NetPacket::Ethernet->decode($pkt)->{data} );
## Return hashref with apropriate fields
return {
type => $arp_opcodes{ $arp->{opcode} },
tv_sec => $hdr->{tv_sec},
tv_usec => $hdr->{tv_usec},
source_haddr => _phys( $arp->{sha} ),
source_ipaddr => _ipaddr( $arp->{spa} ),
target_haddr => _phys( $arp->{tha} ),
target_ipaddr => _ipaddr( $arp->{tpa} ),
}
}
## Pretty printing subs for addresses
sub _ipaddr { join( ".", unpack( "C4", pack( "N", oct( "0x". shift ) ) ) ) }
sub _phys { join( ":", grep {length} split( /(..)/, shift ) ) }
1;
__END__
|
