VaultPress::check_firewall PHP Method

    function check_firewall()
    {
        global $__vp_validate_error;
        $stored_cidrs = $this->get_option('service_ips_cidr');
        $stored_ext_cidrs = get_option('vaultpress_service_ips_external_cidr');
        $one_day_ago = time() - 86400;
        if (empty($stored_cidrs) || empty($stored_ext_cidrs) || $stored_cidrs['updated'] < $one_day_ago) {
            $cidrs = $this->update_firewall();
        }
        if (empty($cidrs)) {
            $cidrs = array_merge($stored_cidrs['data'], $stored_ext_cidrs['data']);
        }
        if (empty($cidrs)) {
            //	No up-to-date info; fall back on the old methods.
            if ($this->do_c_block_firewall()) {
                return true;
            } else {
                $__vp_validate_error = array('error' => 'empty_vp_ip_cidr_range');
                return false;
            }
        }
        //	Figure out possible remote IPs
        if ($this->get_option('allow_forwarded_for') && !empty($_SERVER['HTTP_X_FORWARDED_FOR'])) {
            $remote_ips = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
        }
        if (!empty($_SERVER['REMOTE_ADDR'])) {
            $remote_ips[] = $_SERVER['REMOTE_ADDR'];
        }
        if (empty($remote_ips)) {
            $__vp_validate_error = array('error' => 'no_remote_addr', 'detail' => (int) $this->get_option('allow_forwarded_for'));
            // shouldn't happen
            return false;
        }
        foreach ($remote_ips as $ip) {
            $ip = preg_replace('#^::(ffff:)?#', '', $ip);
            if ($cidr = $this->ip_in_cidrs($ip, $cidrs)) {
                return true;
            }
        }
        $__vp_validate_error = array('error' => 'remote_addr_fail', 'detail' => $remote_ips);
        return false;
    }