#!/usr/local/bin/php
.
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.
*/
$pgtitle = array("Firewall", "NAT", "Edit");
require("guiconfig.inc");
if (!is_array($config['nat']['rule'])) {
$config['nat']['rule'] = array();
}
nat_rules_sort();
$a_nat = &$config['nat']['rule'];
$id = $_GET['id'];
if (isset($_POST['id']))
$id = $_POST['id'];
if (isset($id) && $a_nat[$id]) {
$pconfig['extaddr'] = $a_nat[$id]['external-address'];
$pconfig['proto'] = $a_nat[$id]['protocol'];
list($pconfig['beginport'],$pconfig['endport']) = explode("-", $a_nat[$id]['external-port']);
$pconfig['localip'] = $a_nat[$id]['target'];
$pconfig['localbeginport'] = $a_nat[$id]['local-port'];
$pconfig['descr'] = $a_nat[$id]['descr'];
$pconfig['interface'] = $a_nat[$id]['interface'];
if (!$pconfig['interface'])
$pconfig['interface'] = "wan";
} else {
$pconfig['interface'] = "wan";
}
if ($_POST) {
if ($_POST['beginport_cust'] && !$_POST['beginport'])
$_POST['beginport'] = $_POST['beginport_cust'];
if ($_POST['endport_cust'] && !$_POST['endport'])
$_POST['endport'] = $_POST['endport_cust'];
if ($_POST['localbeginport_cust'] && !$_POST['localbeginport'])
$_POST['localbeginport'] = $_POST['localbeginport_cust'];
if (!$_POST['endport'])
$_POST['endport'] = $_POST['beginport'];
unset($input_errors);
$pconfig = $_POST;
/* input validation */
$reqdfields = explode(" ", "interface proto beginport localip localbeginport");
$reqdfieldsn = explode(",", "Interface,Protocol,Start port,NAT IP,Local port");
do_input_validation($_POST, $reqdfields, $reqdfieldsn, &$input_errors);
if ($_POST['extaddr'] == 'wan' && $_POST['interface'] == 'wan') {
$input_errors[] = "The interface must not be WAN if the External Address is set to WAN.";
}
if (($_POST['beginport'] && !is_port($_POST['beginport']))) {
$input_errors[] = "The start port must be an integer between 1 and 65535.";
}
if (($_POST['endport'] && !is_port($_POST['endport']))) {
$input_errors[] = "The end port must be an integer between 1 and 65535.";
}
if (($_POST['localbeginport'] && !is_port($_POST['localbeginport']))) {
$input_errors[] = "The local port must be an integer between 1 and 65535.";
}
if (($_POST['localip'] && !is_ipaddroralias($_POST['localip']))) {
$input_errors[] = "A valid NAT IP address or host alias must be specified.";
}
if ($_POST['beginport'] > $_POST['endport']) {
/* swap */
$tmp = $_POST['endport'];
$_POST['endport'] = $_POST['beginport'];
$_POST['beginport'] = $tmp;
}
if (!$input_errors) {
if (($_POST['endport'] - $_POST['beginport'] + $_POST['localbeginport']) > 65535)
$input_errors[] = "The target port range must lie between 1 and 65535.";
}
/* check for overlaps */
foreach ($a_nat as $natent) {
if (isset($id) && ($a_nat[$id]) && ($a_nat[$id] === $natent))
continue;
if ($natent['interface'] != $_POST['interface'])
continue;
if ($natent['external-address'] != $_POST['extaddr'])
continue;
if (($natent['protocol'] != $_POST['proto']) && ($natent['protocol'] != "tcp/udp") && ($_POST['proto'] != "tcp/udp"))
continue;
list($begp,$endp) = explode("-", $natent['external-port']);
if (!$endp)
$endp = $begp;
if (!( (($_POST['beginport'] < $begp) && ($_POST['endport'] < $begp))
|| (($_POST['beginport'] > $endp) && ($_POST['endport'] > $endp)))) {
$input_errors[] = "The external port range overlaps with an existing entry.";
break;
}
}
if (!$input_errors) {
$natent = array();
if ($_POST['extaddr'])
$natent['external-address'] = $_POST['extaddr'];
$natent['protocol'] = $_POST['proto'];
if ($_POST['beginport'] == $_POST['endport'])
$natent['external-port'] = $_POST['beginport'];
else
$natent['external-port'] = $_POST['beginport'] . "-" . $_POST['endport'];
$natent['target'] = $_POST['localip'];
$natent['local-port'] = $_POST['localbeginport'];
$natent['interface'] = $_POST['interface'];
$natent['descr'] = $_POST['descr'];
if (isset($id) && $a_nat[$id])
$a_nat[$id] = $natent;
else
$a_nat[] = $natent;
touch($d_natconfdirty_path);
if ($_POST['autoadd'] && ($_POST['extaddr'] != 'wan')) {
/* auto-generate a matching firewall rule */
$filterent = array();
$filterent['interface'] = $_POST['interface'];
$filterent['protocol'] = $_POST['proto'];
$filterent['source']['any'] = "";
$filterent['destination']['address'] = $_POST['localip'];
$dstpfrom = $_POST['localbeginport'];
$dstpto = $dstpfrom + $_POST['endport'] - $_POST['beginport'];
if ($dstpfrom == $dstpto)
$filterent['destination']['port'] = $dstpfrom;
else
$filterent['destination']['port'] = $dstpfrom . "-" . $dstpto;
$filterent['descr'] = "NAT " . $_POST['descr'];
$config['filter']['rule'][] = $filterent;
touch($d_filterconfdirty_path);
}
write_config();
header("Location: firewall_nat.php");
exit;
}
}
?>