Add a dhcpleases monitor to the DHCPv6 server which will trigger automatic creation of routes into the routing table so that prefix delegation will just work.

Redmine ticket #2347

1 files changed, 85 insertions, 0 deletions

diff --git a/usr/local/sbin/prefixes.php b/usr/local/sbin/prefixes.php
new file mode 100644
index 0000000..4a1f7e0
--- /dev/null
+++ b/usr/local/sbin/prefixes.php
@@ -0,0 +1,85 @@
+<?php
+
+$leases_file = "/var/dhcpd/var/db/dhcpd6.leases";
+$leasefile = file($leases_file);
+
+foreach($leasefile as $line) {
+	// echo "$line";
+	if(preg_match("/^(ia-[np][ad])[ ]+\"(.*?)\"/i ", $line, $duidmatch)) {
+		$type = $duidmatch[1];
+		$duid = $duidmatch[2];
+		continue;
+	}
+
+	/* is it active? otherwise just discard */
+	if(preg_match("/binding state active/i", $line, $activematch)) {
+		$active = true;
+		continue;
+	}
+
+	if(preg_match("/iaaddr[ ]+([0-9a-f:]+)[ ]+/i", $line, $addressmatch)) {
+		$ia_na = $addressmatch[1];
+		continue;
+	}
+
+	if(preg_match("/iaprefix[ ]+([0-9a-f:\/]+)[ ]+/i", $line, $prefixmatch)) {
+		$ia_pd = $prefixmatch[1];
+		continue;
+	}
+
+	/* closing bracket */
+	if(preg_match("/^}/i ", $line)) {
+		switch($type) {
+			case "ia-na":
+				$duid_arr[$duid][$type] = $ia_na;
+				break;
+			case "ia-pd":
+				$duid_arr[$duid][$type] = $ia_pd;
+				break;
+		}
+		unset($type);
+		unset($duid);
+		unset($active);
+		unset($ia_na);
+		unset($ia_pd);
+		continue;
+	}
+	array_shift($leasefile);
+}
+
+$routes = array();
+foreach ($duid_arr as $entry) {
+	if($entry['ia-pd'] <> "") {
+		$routes[$entry['ia-na']] = $entry['ia-pd'];
+	}
+}
+
+// echo "add routes\n";
+foreach ($routes as $address => $prefix) {
+	echo "/sbin/route change -inet6 {$prefix} {$address}\n";
+}
+
+/* get clog from dhcpd */
+$dhcpdlogfile = "/var/log/dhcpd.log";
+$clog = array();
+exec("clog $dhcpdlogfile", $clog, $ret);
+
+if($ret > 0)
+	$clog = array();
+
+$expires = array();
+foreach($clog as $line) {
+	if(preg_match("/releases[ ]+prefix[ ]+([0-9a-f:]+\/[0-9]+)/i", $line, $expire)) {
+		if(in_array($expire[1], $routes))
+			continue;
+		$expires[$expire[1]] = $expire[1];
+	}
+	array_shift($clog);
+}
+
+// echo "remove routes\n";
+foreach ($expires as $prefix) {
+	echo "/sbin/route delete -inet6 {$prefix['prefix']}\n";
+}
+
+?>