| #!/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 |