pfSense

function services_dhcrelay6_configure() {

	global $config, $g;

	if ($g['platform'] == 'jail')

		return;

	if(isset($config['system']['developerspew'])) {

		$mt = microtime();

		echo "services_dhcrelay_configure() being called $mt\n";

	}

	/* kill any running dhcrelay */

	killbypid("{$g['varrun_path']}/dhcrelay6.pid");

	$dhcrelaycfg =& $config['dhcrelay6'];

	/* DHCPv6 Relay enabled on any interfaces? */

	if (!isset($dhcrelaycfg['enable']))

		return 0;

	if ($g['booting'])

		echo gettext("Starting DHCPv6 relay service...");

	else

		sleep(1);

	$iflist = get_configured_interface_list();

	$dhcifaces = explode(",", $dhcrelaycfg['interface']);

	foreach ($dhcifaces as $dhcrelayif) {

		if (!isset($iflist[$dhcrelayif]) ||

			link_interface_to_bridge($dhcrelayif))

			continue;

		if (is_ipaddrv6(get_interface_ipv6($dhcrelayif)))

			$dhcrelayifs[] = get_real_interface($dhcrelayif);

	}

	/* 

	 * In order for the relay to work, it needs to be active

	 * on the interface in which the destination server sits.

	 */

	$srvips = explode(",", $dhcrelaycfg['server']);

	foreach ($srvips as $srcidx => $srvip) {

		unset($destif);

		foreach ($iflist as $ifname) {

			$subnet = get_interface_ipv6($ifname);

			if (!is_ipaddrv6($subnet))

				continue;

			$subnet .=  "/" . get_interface_subnetv6($ifname);

			if (ip_in_subnet($srvip, $subnet)) {

				$destif = get_real_interface($ifname);

				break;

			}

		}

		if (!isset($destif)) {

			if (is_array($config['staticroutes']['route'])) {

				foreach ($config['staticroutes']['route'] as $rtent) {

					if (ip_in_subnet($srvip, $rtent['network'])) {

						$a_gateways = return_gateways_array(true);

						$destif = $a_gateways[$rtent['gateway']]['interface'];

						break;

					}

				}

			}

		}

		if (!isset($destif)) {

			/* Create a array from the existing route table */

        		exec("/usr/bin/netstat -rnWf inet6", $route_str);

        		array_shift($route_str);

        		array_shift($route_str);

        		array_shift($route_str);

        		array_shift($route_str);

        		$route_arr = array();

        		foreach($route_str as $routeline) {

                		$items = preg_split("/[ ]+/i", $routeline);

				if (ip_in_subnet($srvip, $items[0])) {

					$destif = trim($items[6]);

					break;

				}

        		}

		}

		if (!isset($destif)) {

			if (is_array($config['gateways']['gateway_item'])) {

				foreach ($config['gateways']['gateway_item'] as $gateway) {

					if (isset($gateway['defaultgw'])) {

						$a_gateways = return_gateways_array(true);

                                        	$destif = $a_gateways[$rtent['gateway']]['interface'];

						break;

					}		

				}

			} else

				$destif = get_real_interface("wan");

		}

		if (!empty($destif))

			$dhcrelayifs[] = $destif;

	}

	$dhcrelayifs = array_unique($dhcrelayifs);

	/* fire up dhcrelay */

	if (empty($dhcrelayifs)) {

		log_error("No suitable interface found for running dhcrelay -6!");

		return; /* XXX */

	}

	$cmd = "/usr/local/sbin/dhcrelay -6 -pf "{$g['varetc_path]}/dhcrelay6.pid" -i " .  implode(" -i ", $dhcrelayifs);

	if (isset($dhcrelaycfg['agentoption']))

		$cmd .=  " -a -m replace";

	$cmd .= " " . implode(" ", $srvips);

	mwexec($cmd);

	return 0;

}