Add parameter to control listen-on

... so that both listen-on and listen-on-v6 can be managed by
the native parameters.

Author: kajinamit

manifests/init.pp

@@ -43,6 +43,8 @@
 #   The forward option
 # @param forwarders
 #   The forwarders option
+# @param listen_on
+#   The listen-on option
 # @param listen_on_v6
 #   The listen-on-v6 option
 # @param recursion
@@ -159,6 +161,7 @@
   Variant[Enum['unmanaged'], Stdlib::Absolutepath] $defaultzonepath = $dns::params::defaultzonepath,
   Optional[Enum['only', 'first']] $forward                          = undef,
   Array[Dns::Forwarder] $forwarders                                 = [],
+  Optional[String] $listen_on                                       = undef,
   Variant[String, Boolean] $listen_on_v6                            = 'any',
   Enum['yes', 'no'] $recursion                                      = 'yes',
   Array[String] $allow_recursion                                    = ['localnets', 'localhost'],

spec/classes/dns_init_spec.rb

@@ -250,6 +250,14 @@
         end
       end
 
+      describe 'with ipv4 disabled' do
+        let(:params) { {:listen_on => 'none'} }
+
+        it { verify_concat_fragment_contents(catalogue, 'options.conf+10-main.dns', [
+          'listen-on { none; };',
+        ])}
+      end
+
       describe 'with ipv6 disabled' do
         let(:params) { {:listen_on_v6 => 'none'} }
 

templates/options.conf.erb

@@ -18,6 +18,9 @@ empty-zones-enable <%= scope.lookupvar('::dns::empty_zones_enable') %>;
 <% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('::dns::dns_notify')) -%>
 notify <%= scope.lookupvar('::dns::dns_notify') %>;
 <% end -%>
+<% unless [nil, :undefined, :undef, ''].include?(scope.lookupvar('::dns::listen_on')) -%>
+listen-on { <%= scope.lookupvar('::dns::listen_on') %>; };
+<% end -%>
 <% unless [false, nil, :undefined, :undef, ''].include?(scope.lookupvar('::dns::listen_on_v6')) -%>
 listen-on-v6 { <%= scope.lookupvar('::dns::listen_on_v6') %>; };
 <% end -%>