<?php
/* $Id$ */
/*
	interfaces_gif_edit.php

	Copyright (C) 2013-2015 Electric Sheep Fencing, LP
	Copyright (C) 2008 Ermal Luçi
	All rights reserved.

	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.

	THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS 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
	AUTHOR 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: interfaces
*/

##|+PRIV
##|*IDENT=page-interfaces-gif-edit
##|*NAME=Interfaces: GIF: Edit page
##|*DESCR=Allow access to the 'Interfaces: GIF: Edit' page.
##|*MATCH=interfaces_gif_edit.php*
##|-PRIV

require("guiconfig.inc");

if (!is_array($config['gifs']['gif']))
	$config['gifs']['gif'] = array();

$a_gifs = &$config['gifs']['gif'];

if (is_numericint($_GET['id'])) {
	$id = $_GET['id'];
}
if (isset($_POST['id']) && is_numericint($_POST['id'])) {
	$id = $_POST['id'];
}

if (isset($id) && $a_gifs[$id]) {
	$pconfig['if'] = $a_gifs[$id]['if'];
	if (!empty($a_gifs[$id]['ipaddr'])) {
		$pconfig['if'] = $pconfig['if'] . '|' . $a_gifs[$id]['ipaddr'];
	}
	$pconfig['gifif'] = $a_gifs[$id]['gifif'];
	$pconfig['remote-addr'] = $a_gifs[$id]['remote-addr'];
	$pconfig['tunnel-remote-net'] = $a_gifs[$id]['tunnel-remote-net'];
	$pconfig['tunnel-local-addr'] = $a_gifs[$id]['tunnel-local-addr'];
	$pconfig['tunnel-remote-addr'] = $a_gifs[$id]['tunnel-remote-addr'];
	$pconfig['link1'] = isset($a_gifs[$id]['link1']);
	$pconfig['link0'] = isset($a_gifs[$id]['link0']);
	$pconfig['descr'] = $a_gifs[$id]['descr'];
}

if ($_POST) {
	unset($input_errors);
	$pconfig = $_POST;

	/* input validation */
	$reqdfields = explode(" ", "if remote-addr tunnel-local-addr tunnel-remote-addr tunnel-remote-net");
	$reqdfieldsn = array(gettext("Parent interface"), gettext("gif remote address"), gettext("gif tunnel local address"), gettext("gif tunnel remote address"), gettext("gif tunnel remote netmask"));

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

	if ((!is_ipaddr($_POST['tunnel-local-addr'])) ||
	    (!is_ipaddr($_POST['tunnel-remote-addr'])) ||
	    (!is_ipaddr($_POST['remote-addr']))) {
		$input_errors[] = gettext("The tunnel local and tunnel remote fields must have valid IP addresses.");
	}

	$alias = strstr($_POST['if'], '|');
	if ((is_ipaddrv4($alias) && !is_ipaddrv4($_POST['remote-addr'])) ||
	    (is_ipaddrv6($alias) && !is_ipaddrv6($_POST['remote-addr']))) {
		$input_errors[] = gettext("The alias IP address family has to match the family of the remote peer address.");
	}

	foreach ($a_gifs as $gif) {
		if (isset($id) && ($a_gifs[$id]) && ($a_gifs[$id] === $gif)) {
			continue;
		}

		/* FIXME: needs to perform proper subnet checks in the future */
		if (($gif['if'] == $interface) && ($gif['tunnel-remote-addr'] == $_POST['tunnel-remote-addr'])) {
			$input_errors[] = sprintf(gettext("A gif with the network %s is already defined."), $gif['tunnel-remote-addr']);
			break;
		}
	}

	if (!$input_errors) {
		$gif = array();
		list($gif['if'], $gif['ipaddr']) = explode("|", $_POST['if']);
		$gif['tunnel-local-addr'] = $_POST['tunnel-local-addr'];
		$gif['tunnel-remote-addr'] = $_POST['tunnel-remote-addr'];
		$gif['tunnel-remote-net'] = $_POST['tunnel-remote-net'];
		$gif['remote-addr'] = $_POST['remote-addr'];
		$gif['descr'] = $_POST['descr'];
		$gif['link1'] = isset($_POST['link1']);
		$gif['link0'] = isset($_POST['link0']);
		$gif['gifif'] = $_POST['gifif'];
		$gif['gifif'] = interface_gif_configure($gif);

		if ($gif['gifif'] == "" || !stristr($gif['gifif'], "gif"))
			$input_errors[] = gettext("Error occurred creating interface, please retry.");
		else {
			if (isset($id) && $a_gifs[$id])
				$a_gifs[$id] = $gif;
			else
				$a_gifs[] = $gif;

			write_config();

			$confif = convert_real_interface_to_friendly_interface_name($gif['gifif']);

			if ($confif != "")
				interface_configure($confif);

			header("Location: interfaces_gif.php");
			exit;
		}
	}
}

function build_parent_list() {
	$parentlist = array();
	$portlist = get_possible_listen_ips();
	foreach ($portlist as $ifn => $ifinfo)
		$parentlist[$ifn] = $ifinfo;

	return($parentlist);
}

$pgtitle = array(gettext("Interfaces"),gettext("GIF"),gettext("Edit"));
$shortcut_section = "interfaces";
include("head.inc");
require('classes/Form.class.php');

$form = new Form();

$section = new Form_Section('GIF Configuration');

$section->addInput(new Form_Select(
	'if',
	'Parent Interface',
	$pconfig['if'],
	build_parent_list()
))->setHelp('This interface serves as the local address to be used for the GIF tunnel.');

$section->addInput(new Form_IpAddress(
	'remote-addr',
	'GIF Remote Address',
	$pconfig['remote-addr']
))->setHelp('Peer address where encapsulated gif packets will be sent.');

$section->addInput(new Form_IpAddress(
	'tunnel-local-addr',
	'GIF tunnel local address',
	$pconfig['tunnel-local-addr']
))->setHelp('Local gif tunnel endpoint.');

$section->addInput(new Form_IpAddress(
	'tunnel-remote-addr',
	'GIF tunnel remote address',
	$pconfig['tunnel-remote-addr']
))->setHelp('Remote GIF address endpoint.');

$section->addInput(new Form_Select(
	'tunnel-remote-net',
	'GIF tunnel remote subnet',
	$pconfig['tunnel-remote-net'],
	array_combine(range(128, 1, -1), range(128, 1, -1))
))->setHelp('The subnet is used for determining the network that is tunnelled');

$section->addInput(new Form_Checkbox(
	'link0',
	'Route Caching',
	'Specify if route caching can be enabled. (Be careful with these settings on dynamic networks.)',
	$pconfig['link0']
));

$section->addInput(new Form_Checkbox(
	'link1',
	'ECN friendly behavior',
	'ECN friendly behavior violates RFC2893. This should be used in mutual agreement with the peer. ',
	$pconfig['link1']
));

$section->addInput(new Form_Input(
	'descr',
	'Description',
	'text',
	$pconfig['descr']
))->setHelp('You may enter a description here for your reference (not parsed).');

$section->addInput(new Form_Input(
	'gifif',
	null,
	'hidden',
	$pconfig['gifif']
));

if (isset($id) && $a_gifs[$id]) {
	$section->addInput(new Form_Input(
		'id',
		null,
		'hidden',
		$id
	));
}

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

include("foot.inc");