[CORD-2270]
Support head node on Ubuntu 16.04 (Xenial)
Change-Id: Ic13ea784b8fa55a481f08d21f5187fd37d13499c
diff --git a/filter_plugins/unbound_revdns.py b/filter_plugins/unbound_revdns.py
new file mode 100644
index 0000000..a45e08e
--- /dev/null
+++ b/filter_plugins/unbound_revdns.py
@@ -0,0 +1,48 @@
+#!/usr/bin/env python
+
+# Copyright 2017-present Open Networking Foundation
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+# unbound_revdns - ansible filter - ipv4 address or cidr and generates a
+# reverse DNS string suitable for use with unbound, which requires them in a
+# slightly unusual format when a RFC1918 address is used with a local-zone
+# definition:
+# https://www.unbound.net/documentation/unbound.conf.html
+# https://www.claudiokuenzler.com/blog/699/unbound-dns-not-serving-reverse-lookup-for-internal-addresses-rfc1918
+
+import netaddr
+
+
+class FilterModule(object):
+
+ def filters(self):
+ return {
+ 'unbound_revdns': self.unbound_revdns,
+ }
+
+ def unbound_revdns(self, var):
+ (o1, o2, o3, o4) = netaddr.IPNetwork(var).network.words
+
+ revdns = "%d.%d.%d.%d.in-addr.arpa." % (o4, o3, o2, o1)
+
+ if (o2 == 0 or o1 == 10):
+ revdns = "%d.in-addr.arpa." % (o1)
+ elif (o3 == 0
+ or (o1 == 172 and o2 >= 16 and o2 <= 31)
+ or (o1 == 192 and o2 == 168)):
+ revdns = "%d.%d.in-addr.arpa." % (o2, o1)
+ elif(o4 == 0):
+ revdns = "%d.%d.%d.in-addr.arpa." % (o3, o2, o1)
+
+ return revdns