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#!/usr/bin/env perl
#
# Generates static mapping commands from the DHCP leases op mode command output
#
# On VyOS and Vyatta, invoke like "run show dhcp server leases | /config/scripts/dhcpremember.pl"
# On EdgeOS, invoke like "run show dhcp leases | /config/scripts/dhcpremember.pl"
#
# Copyright (C) 2014 Daniil Baturin
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
#
use lib "/opt/vyatta/share/perl5/";
use strict;
use warnings;
use Vyatta::Config;
use NetAddr::IP;
my $config = new Vyatta::Config();
while(<>)
{
# skip headers
if( $_ !~ /\d\.?/ )
{
next;
}
# Lease line format: <IPv4> <MAC> <Lease time> <Pool> <Client name>
my @values = split /\s+/, $_;
my $ip = $values[0];
my $mac = $values[1];
my $pool = $values[4];
my $client = undef;
# Client name may not be present
if( defined($values[5]) )
{
$client = $values[5];
}
else
{
$client = $ip;
}
my $subnet = "CHANGME"; # For the case it isn't detected from the config
# Get subnet for the pool
my @subnets = $config->listNodes("service dhcp-server shared-network-name $pool subnet");
my $ip_object = new NetAddr::IP("$ip/32");
foreach my $subnet_str (@subnets)
{
my $subnet_object = new NetAddr::IP($subnet_str);
if( $ip_object->within($subnet_object) )
{
$subnet = $subnet_str;
}
}
$client = $ip unless defined($client);
print "set service dhcp-server shared-network-name $pool subnet $subnet static-mapping $client ip-address $ip\n";
print "set service dhcp-server shared-network-name $pool subnet $subnet static-mapping $client mac-address $mac\n";
}
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