/usr/share/perl5/Net/Write/Layer4.pm is in libnet-write-perl 1.07-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# $Id: Layer4.pm 2000 2012-08-31 14:57:05Z gomor $
#
package Net::Write::Layer4;
use strict;
use warnings;
use Net::Write::Layer qw(:constants);
use base qw(Net::Write::Layer);
__PACKAGE__->cgBuildIndices;
BEGIN {
my $osname = {
cygwin => \&_newWin32,
MSWin32 => \&_newWin32,
};
*new = $osname->{$^O} || \&_newOther;
}
no strict 'vars';
sub _newWin32 {
print STDERR "[-] Not possible to use layer 4 under Windows. Use layer 2 ".
"instead.\n";
return;
}
sub _newOther {
my $self = shift->SUPER::new(
protocol => NW_IPPROTO_TCP,
family => NW_AF_INET,
@_,
) or return;
if (! $self->[$__dst]) {
print STDERR "[-] @{[(caller(0))[3]]}: you must pass `dst' parameter\n";
return;
}
return $self;
}
1;
__END__
=head1 NAME
Net::Write::Layer4 - object for a transport layer (layer 4) descriptor
=head1 SYNOPSIS
use Net::Write::Layer qw(:constants);
use Net::Write::Layer4;
my $desc = Net::Write::Layer4->new(
dst => '192.168.0.1',
protocol => NW_IPPROTO_TCP,
family => NW_AF_INET,
);
$desc->open;
$desc->send('G'x666);
$desc->close;
=head1 DESCRIPTION
This is the class for creating a layer 4 descriptor.
=head1 ATTRIBUTES
=over 4
=item B<dst>
The target IPv4 or IPv6 address we will send frames to.
=item B<family>
Address family, see B<Net::Write::Layer> CONSTANTS section.
=item B<protocol>
Transport layer protocol to use, see B<Net::Write::Layer> CONSTANTS section.
=back
=head1 METHODS
=over 4
=item B<new>
Object constructor. You MUST pass a valid B<dst> attribute. Default values:
protocol: NW_IPPROTO_TCP
family: NW_AF_INET
Returns undef on error.
=item B<open>
Open the interface. Returns undef on error.
=item B<send> (scalar)
Send raw data to the network.
=item B<close>
Close the descriptor.
=back
=head1 CAVEATS
Does not work at all under Win32 systems. They can't send frames at layer 4.
=head1 SEE ALSO
L<Net::Write::Layer>
=head1 AUTHOR
Patrice E<lt>GomoRE<gt> Auffret
=head1 COPYRIGHT AND LICENSE
Copyright (c) 2006-2012, 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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