[dnsmasq] Added listener related configurations

Signed-off-by: Roberto Alfieri <ralfieri@redhat.com>

roles/dnsmasq/defaults/main.yml

@@ -19,3 +19,7 @@
 
 cifmw_dnsmasq_basedir: "/etc/cifmw-dnsmasq.d"
 cifmw_dnsmasq_global_options: {}
+cifmw_dnsmasq_forwarders: []
+cifmw_dnsmasq_interfaces: []
+cifmw_dnsmasq_listen_addresses: []
+cifmw_dnsmasq_enable_dns: false

roles/dnsmasq/tasks/configure.yml

@@ -60,6 +60,9 @@
     src: "cifmw-dnsmasq.conf.j2"
     validate: "/usr/sbin/dnsmasq -C %s --test"
 
+- name: Render listening directives
+  ansible.builtin.include_tasks: listener.yml
+
 - name: Manage and start dnsmasq instance
   become: true
   when:

roles/dnsmasq/tasks/listener.yml

@@ -0,0 +1,34 @@
+---
+# Copyright Red Hat, Inc.
+# All Rights Reserved.
+#
+# 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.
+
+- name: Create listener configuration file
+  become: true
+  when:
+    - _act == 'install'
+  notify: Restart dnsmasq
+  ansible.builtin.template:
+    dest: "{{ cifmw_dnsmasq_basedir }}/listener.conf"
+    mode: "0644"
+    src: "listener.conf.j2"
+    validate: "/usr/sbin/dnsmasq -C %s --test"
+
+- name: Remove listener configuration file
+  become: true
+  when:
+    - _act == 'cleanup'
+  ansible.builtin.file:
+    path: "{{ cifmw_dnsmasq_basedir }}/listener.conf"
+    state: absent

roles/dnsmasq/templates/cifmw-dnsmasq.conf.j2

@@ -1,7 +1,5 @@
-# Disable DNS
-port=0
-# Avoid conflict with other DNS listening on lo
-except-interface=lo
+# Managed by ci-framework/dnsmasq
+
 user=dnsmasq
 group=dnsmasq
 pid-file=/var/run/cifmw-dnsmasq.pid

roles/dnsmasq/templates/listener.conf.j2

@@ -0,0 +1,20 @@
+# Managed by ci-framework/dnsmasq
+
+{% if cifmw_dnsmasq_enable_dns is false                %}
+Port=0 
+{% endif                                               %}
+
+# Avoid conflict with other DNS listening on lo
+except-interface=lo
+
+{% if cifmw_dnsmasq_listen_addresses | length > 0      %}
+listen_address={{ cifmw_dnsmasq_listen_addresses |
+                  reject('equalto', '127.0.0.1') |
+                  join(',') }}
+{% endif                                               %}
+
+{% for interface in cifmw_dnsmasq_interfaces           %}
+{%   if interface != "lo"                              %}
+interface={{ interface }}
+{%   endif                                             %}
+{% endfor                                              %}