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#
# $Id: Layer2.pm 1636 2009-06-10 18:38:24Z gomor $
#
package Net::Write::Layer2;
use strict;
use warnings;
require Net::Write::Layer;
our @ISA = qw(Net::Write::Layer);
__PACKAGE__->cgBuildIndices;
no strict 'vars';
use Carp;
use Net::Pcap;
sub new {
my $self = shift->SUPER::new(@_);
croak("@{[(caller(0))[3]]}: you must pass `dev' parameter\n")
unless $self->[$__dev];
$self;
}
sub open {
my $self = shift;
my $err;
my $pd = Net::Pcap::open_live(
$self->[$__dev],
0,
0,
1000,
\$err,
);
unless ($pd) {
croak("@{[(caller(0))[3]]}: Net::Pcap::open_live: @{[$self->dev]}: ".
"$err\n");
}
$self->[$___io] = $pd;
1;
}
sub send {
my $self = shift;
my ($raw) = @_;
while (1) {
if (Net::Pcap::sendpacket($self->[$___io], $raw) < 0) {
if ($!{ENOBUFS}) {
$self->cgDebugPrint(2, "ENOBUFS, sleeping for 1 second");
sleep 1;
next;
}
elsif ($!{EHOSTDOWN}) {
$self->cgDebugPrint(2, "host is down");
last;
}
carp("@{[(caller(0))[3]]}: ".Net::Pcap::geterr($self->[$___io])."\n");
return undef;
}
last;
}
1;
}
sub close {
my $self = shift;
if ($self->[$___io]) {
Net::Pcap::close($self->[$___io]);
$self->[$___io] = undef;
}
}
1;
__END__
=head1 NAME
Net::Write::Layer2 - object for a link layer (layer 2) descriptor
=head1 SYNOPSIS
use Net::Write::Layer2;
my $desc = Net::Write::Layer2->new(
dev => 'eth0',
);
$desc->open;
$desc->send('G'x666);
$desc->close;
=head1 DESCRIPTION
This is the class for creating a layer 2 descriptor.
=head1 ATTRIBUTES
=over 4
=item B<dev>
The string specifying network interface to use.
Under Unix-like systems, this is in this format: \w+\d+ (example: eth0).
Under Windows systems, this is more complex; example:
\Device\NPF_{0749A9BC-C665-4C55-A4A7-34AC2FBAB70F}
=back
=head1 METHODS
=over 4
=item B<new>
Object constructor. You MUST pass a valid B<dev> attribute. There is no default value.
=item B<open>
Open the interface.
=item B<send> (scalar)
Send raw data to the network.
=item B<close>
Close the descriptor.
=back
=head1 CAVEATS
Writing junk to loopback interface on BSD systems will not work.
=head1 SEE ALSO
L<Net::Write::Layer>
=head1 AUTHOR
Patrice E<lt>GomoRE<gt> Auffret
=head1 COPYRIGHT AND LICENSE
Copyright (c) 2006-2009, Patrice E<lt>GomoRE<gt> Auffret
You may distribute this module under the terms of the Artistic license.
See LICENSE.Artistic file in the source distribution archive.
=cut
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