<?php
/*
	services_dhcpv6_relay.php
*/
/* ====================================================================
 *	Copyright (c)  2004-2015  Electric Sheep Fencing, LLC. All rights reserved.
 *  Copyright (c)  2003-2004 Justin Ellison <justin@techadvise.com>
 *  Copyright (c)  2010 	Seth Mos
 *
 *	Redistribution and use in source and binary forms, with or without modification,
 *	are permitted provided that the following conditions are met:
 *
 *	1. Redistributions of source code must retain the above copyright notice,
 *		this list of conditions and the following disclaimer.
 *
 *	2. Redistributions in binary form must reproduce the above copyright
 *		notice, this list of conditions and the following disclaimer in
 *		the documentation and/or other materials provided with the
 *		distribution.
 *
 *	3. All advertising materials mentioning features or use of this software
 *		must display the following acknowledgment:
 *		"This product includes software developed by the pfSense Project
 *		 for use in the pfSense software distribution. (http://www.pfsense.org/).
 *
 *	4. The names "pfSense" and "pfSense Project" must not be used to
 *		 endorse or promote products derived from this software without
 *		 prior written permission. For written permission, please contact
 *		 coreteam@pfsense.org.
 *
 *	5. Products derived from this software may not be called "pfSense"
 *		nor may "pfSense" appear in their names without prior written
 *		permission of the Electric Sheep Fencing, LLC.
 *
 *	6. Redistributions of any form whatsoever must retain the following
 *		acknowledgment:
 *
 *	"This product includes software developed by the pfSense Project
 *	for use in the pfSense software distribution (http://www.pfsense.org/).
 *
 *	THIS SOFTWARE IS PROVIDED BY THE pfSense PROJECT ``AS IS'' AND ANY
 *	EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *	IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 *	PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE pfSense PROJECT OR
 *	ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 *	SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 *	NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *	LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 *	HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 *	STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 *	ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 *	OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *	====================================================================
 *
 */
/*
	pfSense_MODULE:	dhcpv6relay
*/

##|+PRIV
##|*IDENT=page-services-dhcpv6relay
##|*NAME=Services: DHCPv6 Relay page
##|*DESCR=Allow access to the 'Services: DHCPv6 Relay' page.
##|*MATCH=services_dhcpv6_relay.php*
##|-PRIV

require("guiconfig.inc");
require_once('classes/Form.class.php');

function filterDestinationServers(array $destinationServers)
{
	return array_unique(
		array_filter($destinationServers)
	);
}

$pconfig['enable'] = isset($config['dhcrelay6']['enable']);
if (empty($config['dhcrelay6']['interface'])) {
	$pconfig['interface'] = array();
} else {
	$pconfig['interface'] = explode(",", $config['dhcrelay6']['interface']);
}

$pconfig['server'] = filterDestinationServers(
	explode(',', $config['dhcrelay6']['server'])
);

$pconfig['agentoption'] = isset($config['dhcrelay6']['agentoption']);

$iflist = array_intersect_key(
	get_configured_interface_with_descr(),
	array_flip(
		array_filter(
			array_keys(get_configured_interface_with_descr()),
			function($if) {
				return is_ipaddrv6(get_interface_ipv6($if));
			}
		)
	)
);

/*   set the enabled flag which will tell us if DHCP server is enabled
 *   on any interface.   We will use this to disable dhcp-relay since
 *   the two are not compatible with each other.
 */
$dhcpd_enabled = false;
if (is_array($config['dhcpdv6'])) {
	foreach ($config['dhcpdv6'] as $dhcp) {
		if (isset($dhcp['enable']) && isset($config['interfaces'][$dhcpif]['enable'])) {
			$dhcpd_enabled = true;
			break;
		}
	}
}

if ($_POST) {

	unset($input_errors);

	if ($_POST['server'])
		$_POST['server'] = filterDestinationServers($_POST['server']);

	$pconfig = $_POST;

	/* input validation */
	if ($_POST['enable']) {
		$reqdfields = explode(" ", "server interface");
		$reqdfieldsn = array(gettext("Destination Server"), gettext("Interface"));

		do_input_validation($_POST, $reqdfields, $reqdfieldsn, $input_errors);

		if ($_POST['server']) {
			foreach ($_POST['server'] as $srv) {
				if (!is_ipaddrv6($srv))
					$input_errors[] = gettext("A valid Destination Server IPv6 address  must be specified.");
			}
		}
	}

	if (!$input_errors) {
		$config['dhcrelay6']['enable'] = $_POST['enable'] ? true : false;
		$config['dhcrelay6']['interface'] = implode(",", $_POST['interface']);
		$config['dhcrelay6']['agentoption'] = $_POST['agentoption'] ? true : false;
		$config['dhcrelay6']['server'] = $_POST['server'];

		write_config();

		$retval = 0;
		$retval = services_dhcrelay6_configure();
		$savemsg = get_std_save_message($retval);
	}
}

$closehead = false;
$pgtitle = array(gettext("Services"), gettext("DHCPv6 Relay"));
$shortcut_section = "dhcp6";
include("head.inc");

if ($dhcpd_enabled)
{
	echo '<div class="alert alert-danger">DHCPv6 Server is currently enabled. Cannot enable the DHCPv6 Relay service while the DHCPv6 Server is enabled on any interface.</div>';
	include("foot.inc");
	exit;
}

if ($input_errors)
	print_input_errors($input_errors);

if ($savemsg)
	print_info_box($savemsg);

$form = new Form;

$section = new Form_Section('DHCPv6 Relay configuration');

$section->addInput(new Form_Checkbox(
	'enable',
	'Enable',
	'Enable DHCPv6 relay on interface',
	$pconfig['enable']
))->toggles('.form-group:not(:first-child)');

$section->addInput(new Form_Select(
	'interface',
	'Interface(s)',
	$pconfig['interface'],
	$iflist,
	true
))->setHelp('Interfaces without an IPv6 address will not be shown.');


$section->addInput(new Form_Checkbox(
	'agentoption',
	'',
	'Append circuit ID and agent ID to requests',
	'yes',
	$pconfig['agentoption']
))->setHelp(
	'If this is checked, the DHCPv6 relay will append the circuit ID (%s interface number) and the agent ID to the DHCPv6 request.',
	[$g['product_name']]
);

function createDestinationServerInputGroup($value = null)
{
	$group = new Form_Group('Destination server');
	$group->enableDuplication();

	$group->add(new Form_IpAddress(
		'server',
		'Destination server',
		$value
	))->setHelp(
		'This is the IPv6 address of the server to which DHCPv6 requests are relayed.'
	)->setIsRepeated();

	return $group;
}

if (!isset($pconfig['server']) || count($pconfig['server']) < 1)
	$section->add(createDestinationServerInputGroup());
else
	foreach ($pconfig['server'] as $idx => $server)
		$section->add(createDestinationServerInputGroup($server));

$form->add($section);
print $form;

include("foot.inc");