/usr/lib/perl5/Net/Libdnet/Fw.pm is in libnet-libdnet-perl 0.98-1build1.
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: Fw.pm 57 2012-11-02 16:39:39Z gomor $
#
package Net::Libdnet::Fw;
use strict; use warnings;
use base qw(Class::Gomor::Array);
our @AS = qw(
_handle
);
__PACKAGE__->cgBuildIndices;
__PACKAGE__->cgBuildAccessorsScalar(\@AS);
use Net::Libdnet qw(:fw :consts);
sub new {
my $self = shift->SUPER::new(@_);
my $handle = dnet_fw_open() or die("Fw::new: unable to open");
$self->_handle($handle);
$self;
}
#
# block out eth1 tcp 127.0.0.1:4000-4100 127.0.0.2:4300-4400
# block out eth1 icmp 127.0.0.1:4000-4100 127.0.0.2:4300-4400 0/0
#
sub _to_hash {
my ($rule) = @_;
my @toks = split(/ +/, $rule);
my ($op, $dir, $device, $proto, $src, $dst, $sport, $dport, $type, $code);
my $srcOk;
for (@toks) {
if (/^block$|^allow$/i) { $op = $_ }
elsif (/^in$|^out$/i) { $dir = $_ }
elsif (/^tcp$|^udp$|^icmp$/) { $proto = $_ }
elsif (!$srcOk && /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/) {
my @src = split(/:/);
$src = $src[0] if defined($src[0]);
if (defined($src[1])) {
my @port = split(/-/, $src[1]);
push @$sport, $port[0] if defined($port[0]);
push @$sport, $port[1] if defined($port[1]);
}
$srcOk++;
}
elsif ($srcOk && /^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/) {
my @dst = split(/:/);
$dst = $dst[0] if defined($dst[0]);
if (defined($dst[1])) {
my @port = split(/-/, $dst[1]);
push @$dport, $port[0] if defined($port[0]);
push @$dport, $port[1] if defined($port[1]);
}
}
else {
$device = $_;
}
}
if (defined($op)) {
if ($op =~ /block/i) { $op = DNET_FW_OP_BLOCK }
elsif ($op =~ /allow/i) { $op = DNET_FW_OP_ALLOW }
}
if (defined($dir)) {
if ($dir =~ /in/i) { $dir = DNET_FW_DIR_IN }
elsif ($dir =~ /out/i) { $dir = DNET_FW_DIR_OUT }
}
if (defined($proto)) {
if ($proto =~ /tcp/i) { $proto = 0x06 }
elsif ($proto =~ /udp/i) { $proto = 0x11 }
elsif ($proto =~ /icmp/i) { $proto = 0x01 }
}
my $h = {
fw_device => $device || 'any',
fw_op => $op || DNET_FW_OP_BLOCK,
fw_dir => $dir || DNET_FW_DIR_IN,
fw_proto => $proto || 0,
fw_src => $src || '0.0.0.0/0',
fw_dst => $dst || '0.0.0.0/0',
fw_sport => $sport || [0, 0],
fw_dport => $dport || [0, 0],
};
}
sub add {
my $self = shift;
my ($rule) = @_;
dnet_fw_add($self->_handle, _to_hash($rule));
}
sub delete {
my $self = shift;
my ($rule) = @_;
dnet_fw_delete($self->_handle, _to_hash($rule));
}
sub loop {
my $self = shift;
my ($sub, $data) = @_;
dnet_fw_loop($self->_handle, $sub, $data || \'');
}
sub DESTROY {
my $self = shift;
defined($self->_handle) && dnet_fw_close($self->_handle);
}
1;
__END__
=head1 NAME
Net::Libdnet::Fw - high level API to access libdnet fw_* functions
=head1 SYNOPSIS
XXX
=head1 DESCRIPTION
XXX
=head1 METHODS
=over 4
=item B<new>
=item B<add>
=item B<delete>
=item B<loop>
=back
=head1 AUTHOR
Patrice E<lt>GomoRE<gt> Auffret
=head1 COPYRIGHT AND LICENSE
You may distribute this module under the terms of the BSD license. See LICENSE file in the source distribution archive.
Copyright (c) 2008-2012, Patrice <GomoR> Auffret
=cut
|