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<?php
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/*
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* prefixes.php
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*
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* part of pfSense (https://www.pfsense.org)
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* Copyright (c) 2004-2013 BSD Perimeter
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* Copyright (c) 2013-2016 Electric Sheep Fencing
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* Copyright (c) 2014-2025 Rubicon Communications, LLC (Netgate)
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* All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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require_once('system.inc');
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require_once('util.inc');
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$leases_file = "/var/dhcpd/var/db/dhcpd6.leases";
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if (!file_exists($leases_file)) {
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exit(1);
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}
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$fd = fopen($leases_file, 'r');
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$duid_arr = array();
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while (( $line = fgets($fd, 4096)) !== false) {
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// echo "$line";
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/* Originally: preg_match("/^(ia-[np][ad])[ ]+\"(.*?)\"/i", $line, $duidmatch)
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That is: \"(.*?)\"
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, which is a non-greedy matching. However that does not go well with the legal
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substring \" in the IAID+DUID lease string format of ISC DHCPDv6,
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because it truncates before we reach the end of the IAID+DUID string!
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Instead we use: \"(.*)\"
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(Might fail if content of the lease file is not well formed.)
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Maybe someone would argue to e.g. use \"(.*?)\"[ \t]*{[ \t]*$
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instead
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(Either we get a valid result or nothing at all.)
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, but I'll leave it to others to decide! */
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if (preg_match("/^(ia-[np][ad])[ ]+\"(.*)\"/i", $line, $duidmatch)) {
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$type = $duidmatch[1];
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$duid = extract_duid($duidmatch[2]);
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continue;
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}
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/* is it active? otherwise just discard */
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if (preg_match("/binding state active/i", $line, $activematch)) {
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$active = true;
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continue;
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}
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if (preg_match("/iaaddr[ ]+([0-9a-f:]+)[ ]+/i", $line, $addressmatch)) {
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$ia_na = $addressmatch[1];
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continue;
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}
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if (preg_match("/iaprefix[ ]+([0-9a-f:\/]+)[ ]+/i", $line, $prefixmatch)) {
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$ia_pd = $prefixmatch[1];
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continue;
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}
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/* closing bracket */
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if (preg_match("/^}/i", $line)) {
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if (isset($duid) && $duid !== false && $active === true) {
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switch ($type) {
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case "ia-na":
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$duid_arr[$duid][$type] = $ia_na;
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break;
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case "ia-pd":
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$duid_arr[$duid][$type] = $ia_pd;
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break;
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default:
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break;
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}
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}
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unset($type);
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unset($duid);
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unset($active);
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unset($ia_na);
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unset($ia_pd);
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continue;
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}
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}
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fclose($fd);
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$routes = array();
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foreach ($duid_arr as $entry) {
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if (!empty($entry['ia-pd'])) {
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$routes[$entry['ia-na']] = $entry['ia-pd'];
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}
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}
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// echo "add routes\n";
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if (count($routes) > 0) {
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foreach ($routes as $address => $prefix) {
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route_add_or_change($prefix, $address);
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}
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}
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/* get log from dhcpd */
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$dhcpdlogfile = "/var/log/dhcpd.log";
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$expires = array();
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if (file_exists($dhcpdlogfile)) {
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$fd = popen(system_log_get_cat() . ' ' . sort_related_log_files($dhcpdlogfile, true, true), 'r');
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while (($line = fgets($fd)) !== false) {
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//echo $line;
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if (preg_match("/releases[ ]+prefix[ ]+([0-9a-f:]+\/[0-9]+)/i", $line, $expire)) {
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if (in_array($expire[1], $routes)) {
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continue;
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}
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if (!in_array($expire[1], $expires)) {
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$expires[] = $expire[1];
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}
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}
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}
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pclose($fd);
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}
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// echo "remove routes\n";
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if (count($expires) > 0) {
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foreach ($expires as $prefix) {
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route_del($prefix);
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}
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}
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/* handle quotify_buf - https://gitlab.isc.org/isc-projects/dhcp/-/blob/master/common/print.c */
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function extract_duid($ia_string) {
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for ($i = 0, $iaid_counter = 0, $len = strlen($ia_string); $i < $len && $iaid_counter < 4; $i++, $iaid_counter++) {
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if ($ia_string[$i] !== '\\') {
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continue;
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}
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else if ($len - $i >= 2) {
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if (($ia_string[$i+1] === '\\') || ($ia_string[$i+1] === '"')) {
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$i += 1;
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continue;
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}
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else if ($len - $i >= 4) {
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if (preg_match('/[0-3][0-7]{2}/', substr($ia_string, $i+1, 3))) {
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$i += 3;
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continue;
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}
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}
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}
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return false;
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}
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/* Return anything after the first 4 octets! */
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if ($iaid_counter === 4) {
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/* substr returns false when $len == $i */
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return substr($ia_string, $i);
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}
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return false;
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}
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?>
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