Make it possible to control Coturn ports and listen interfaces

Related to #330 (Github Issue).

roles/matrix-coturn/defaults/main.yml

@@ -27,14 +27,32 @@ matrix_coturn_container_additional_volumes: []
 # A list of extra arguments to pass to the container
 matrix_coturn_container_extra_arguments: []
 
-# A shared secret (between Synapse and Coturn) used for authentication.
-# You can put any string here, but generating a strong one is preferred (e.g. `pwgen -s 64 1`).
-matrix_coturn_turn_static_auth_secret: ""
+# Controls whether the Coturn container exposes its plain STUN port (tcp/3478 and udp/3478 in the container).
+#
+# Takes an "<ip>:<port>" or "<port>" value (e.g. "127.0.0.1:3478"), or empty string to not expose.
+matrix_coturn_container_stun_plain_host_bind_port: '3478'
+
+# Controls whether the Coturn container exposes its TLS STUN port (tcp/5349 and udp/5349 in the container).
+#
+# Takes an "<ip>:<port>" or "<port>" value (e.g. "127.0.0.1:5349"), or empty string to not expose.
+matrix_coturn_container_stun_tls_host_bind_port: '5349'
+
+# Controls whether the Coturn container exposes its TURN UDP port range and which interface to do it on.
+#
+# Takes an interface "<ip address>" (e.g. "127.0.0.1"), or empty string to listen on all interfaces.
+# Takes a null/none value (`~`) to prevent listening.
+#
+# The UDP port-range itself is specified using `matrix_coturn_turn_udp_min_port` and `matrix_coturn_turn_udp_max_port`.
+matrix_coturn_container_turn_range_listen_interface: ''
 
 # UDP port-range to use for TURN
 matrix_coturn_turn_udp_min_port: 49152
 matrix_coturn_turn_udp_max_port: 49172
 
+# A shared secret (between Synapse and Coturn) used for authentication.
+# You can put any string here, but generating a strong one is preferred (e.g. `pwgen -s 64 1`).
+matrix_coturn_turn_static_auth_secret: ""
+
 # The external IP address of the machine where Coturn is.
 matrix_coturn_turn_external_ip_address: ''
 

roles/matrix-coturn/templates/systemd/matrix-coturn.service.j2

@@ -19,11 +19,17 @@ ExecStart=/usr/bin/docker run --rm --name matrix-coturn \
 			--read-only \
 			--tmpfs=/var/tmp:rw,noexec,nosuid,size=100m \
 			--network={{ matrix_coturn_docker_network }} \
-			-p 3478:3478 \
-			-p 3478:3478/udp \
-			-p 5349:5349 \
-			-p 5349:5349/udp \
-			-p {{ matrix_coturn_turn_udp_min_port }}-{{ matrix_coturn_turn_udp_max_port }}:{{ matrix_coturn_turn_udp_min_port }}-{{ matrix_coturn_turn_udp_max_port }}/udp \
+			{% if matrix_coturn_container_stun_plain_host_bind_port != '' %}
+			-p {{ matrix_coturn_container_stun_plain_host_bind_port }}:3478 \
+			-p {{ matrix_coturn_container_stun_plain_host_bind_port }}:3478/udp \
+			{% endif %}
+			{% if matrix_coturn_container_stun_tls_host_bind_port != '' %}
+			-p {{ matrix_coturn_container_stun_tls_host_bind_port }}:5349 \
+			-p {{ matrix_coturn_container_stun_tls_host_bind_port }}:5349/udp \
+			{% endif %}
+			{% if matrix_coturn_container_turn_range_listen_interface is not none %}
+			-p {{ matrix_coturn_container_turn_range_listen_interface }}{{ ':' if matrix_coturn_container_turn_range_listen_interface else '' }}{{ matrix_coturn_turn_udp_min_port }}-{{ matrix_coturn_turn_udp_max_port }}:{{ matrix_coturn_turn_udp_min_port }}-{{ matrix_coturn_turn_udp_max_port }}/udp \
+			{% endif %}
 			-v {{ matrix_coturn_config_path }}:/turnserver.conf:ro \
 			{% for volume in matrix_coturn_container_additional_volumes %}
 			-v {{ volume.src }}:{{ volume.dst }}:{{ volume.options }} \