Allow configuring of bind/listen IP

src/config.js

@@ -3,6 +3,7 @@
 const { release } = require('./package.json');
 
 module.exports.RELEASE = release;
+module.exports.LISTEN_IP = process.env.LISTEN_IP || '0.0.0.0';
 module.exports.PORT = process.env.PORT || 51821;
 module.exports.PASSWORD = process.env.PASSWORD;
 module.exports.WG_PATH = process.env.WG_PATH || '/etc/wireguard/';

src/lib/Server.js

@@ -11,6 +11,7 @@ const ServerError = require('./ServerError');
 const WireGuard = require('../services/WireGuard');
 
 const {
+  LISTEN_IP,
   PORT,
   RELEASE,
   PASSWORD,
@@ -135,8 +136,8 @@ module.exports = class Server {
         return WireGuard.updateClientAddress({ clientId, address });
       }))
 
-      .listen(PORT, () => {
-        debug(`Listening on http://0.0.0.0:${PORT}`);
+      .listen(PORT, LISTEN_IP, () => {
+        debug(`Listening on http://${LISTEN_IP}:${PORT}`);
       });
   }