#!/usr/bin/perl
# Module: vyatta-gateway-static_route-check.pl
#
# **** License ****
# 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.
#
# A copy of the GNU General Public License is available as
# `/usr/share/common-licenses/GPL' in the Debian GNU/Linux distribution
# or on the World Wide Web at `http://www.gnu.org/copyleft/gpl.html'.
# You can also obtain it by writing to the Free Software Foundation,
# Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston,
# MA 02110-1301, USA.
#
# This code was originally developed by Vyatta, Inc.
# Portions created by Vyatta are Copyright (C) 2008 Vyatta, Inc.
# All Rights Reserved.
#
# Author: Mohit Mehta
# Date: June 2008
# Description: Script to check if any one of the 'static route' is equivalent to the 'system gateway-address'
#              if yes, then don't remove route from routing table unless both are unset
# **** End License ****

use strict;
use warnings;
use lib "/opt/vyatta/share/perl5/";

use NetAddr::IP;
use Vyatta::Config;

if ( ( $#ARGV == 1 ) && ( $ARGV[0] eq '0.0.0.0/0' ) ) {

    # check when deleting static-route
    my $vcCHECK_GATEWAY = new Vyatta::Config();
    $vcCHECK_GATEWAY->setLevel('system');
    if ( $vcCHECK_GATEWAY->exists('.') ) {
        my $gateway_ip = $vcCHECK_GATEWAY->returnValue('gateway-address');
        if ( defined($gateway_ip) && $gateway_ip eq $ARGV[1] ) {
            exit 1;
        }
    }

}
elsif ( $#ARGV == 0 ) {

    # check when deleting gateway-address
    my $vcCHECK_STATIC_ROUTE = new Vyatta::Config();
    $vcCHECK_STATIC_ROUTE->setLevel('protocols static');
    if ( $vcCHECK_STATIC_ROUTE->exists('.') ) {
        my @routes = $vcCHECK_STATIC_ROUTE->listNodes("route");
        if ( @routes > 0 ) {
            foreach my $route (@routes) {
                if ( $route eq '0.0.0.0/0' ) {
                    my @next_hops =
                      $vcCHECK_STATIC_ROUTE->listNodes("route $route next-hop");
                    foreach my $next_hop (@next_hops) {
                        if ( $next_hop eq $ARGV[0] ) {
                            exit 1;
                        }
                    }
                }
            }
        }
    }
}

exit 0;