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tor-router


			
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    <h2><a href="index.html">Home</a></h2><h3>Classes</h3><ul><li><a href="ControlServer.html">ControlServer</a><ul class='methods'><li data-type='method'><a href="ControlServer.html#.instance_info">instance_info</a></li><li data-type='method'><a href="ControlServer.html#close">close</a></li><li data-type='method'><a href="ControlServer.html#createDNSServer">createDNSServer</a></li><li data-type='method'><a href="ControlServer.html#createHTTPServer">createHTTPServer</a></li><li data-type='method'><a href="ControlServer.html#createSOCKSServer">createSOCKSServer</a></li><li data-type='method'><a href="ControlServer.html#createTorPool">createTorPool</a></li><li data-type='method'><a href="ControlServer.html#listen">listen</a></li><li data-type='method'><a href="ControlServer.html#listenTcp">listenTcp</a></li><li data-type='method'><a href="ControlServer.html#listenWs">listenWs</a></li></ul></li><li><a href="DNSServer.html">DNSServer</a><ul class='methods'><li data-type='method'><a href="DNSServer.html#listen">listen</a></li></ul></li><li><a href="HTTPServer.html">HTTPServer</a><ul class='methods'><li data-type='method'><a href="HTTPServer.html#listen">listen</a></li></ul></li><li><a href="SOCKSServer.html">SOCKSServer</a><ul class='methods'><li data-type='method'><a href="SOCKSServer.html#listen">listen</a></li></ul></li><li><a href="TorPool.html">TorPool</a><ul class='methods'><li data-type='method'><a href="TorPool.html#add">add</a></li><li data-type='method'><a href="TorPool.html#add_instance_to_group">add_instance_to_group</a></li><li data-type='method'><a href="TorPool.html#add_instance_to_group_at">add_instance_to_group_at</a></li><li data-type='method'><a href="TorPool.html#add_instance_to_group_by_name">add_instance_to_group_by_name</a></li><li data-type='method'><a href="TorPool.html#create">create</a></li><li data-type='method'><a href="TorPool.html#create_instance">create_instance</a></li><li data-type='method'><a href="TorPool.html#exit">exit</a></li><li data-type='method'><a href="TorPool.html#get_config_at">get_config_at</a></li><li data-type='method'><a href="TorPool.html#get_config_by_name">get_config_by_name</a></li><li data-type='method'><a href="TorPool.html#instance_at">instance_at</a></li><li data-type='method'><a href="TorPool.html#instance_by_name">instance_by_name</a></li><li data-type='method'><a href="TorPool.html#instances_by_group">instances_by_group</a></li><li data-type='method'><a href="TorPool.html#new_identites">new_identites</a></li><li data-type='method'><a href="TorPool.html#new_identites_by_group">new_identites_by_group</a></li><li data-type='method'><a href="TorPool.html#new_identity_at">new_identity_at</a></li><li data-type='method'><a href="TorPool.html#new_identity_by_name">new_identity_by_name</a></li><li data-type='method'><a href="TorPool.html#next">next</a></li><li data-type='method'><a href="TorPool.html#next_by_group">next_by_group</a></li><li data-type='method'><a href="TorPool.html#remove">remove</a></li><li data-type='method'><a href="TorPool.html#remove_at">remove_at</a></li><li data-type='method'><a href="TorPool.html#remove_by_name">remove_by_name</a></li><li data-type='method'><a href="TorPool.html#remove_instance_from_group">remove_instance_from_group</a></li><li data-type='method'><a href="TorPool.html#remove_instance_from_group_at">remove_instance_from_group_at</a></li><li data-type='method'><a href="TorPool.html#remove_instance_from_group_by_name">remove_instance_from_group_by_name</a></li><li data-type='method'><a href="TorPool.html#set_config_all">set_config_all</a></li><li data-type='method'><a href="TorPool.html#set_config_at">set_config_at</a></li><li data-type='method'><a href="TorPool.html#set_config_by_group">set_config_by_group</a></li><li data-type='method'><a href="TorPool.html#set_config_by_name">set_config_by_name</a></li><li data-type='method'><a href="TorPool.html#signal_all">signal_all</a></li><li data-type='method'><a href="TorPool.html#signal_at">signal_at</a></li><li data-type='method'><a href="TorPool.html#signal_by_group">signal_by_group</a></li><li data-type='method'><a href="TorPool.html#signal_by_name">signal_by_name</a></li></ul></li><li><a href="TorProcess.html">TorProcess</a><ul class='methods'><li data-type='method'><a href="TorProcess.html#create">create</a></li><li data-type='method'><a href="TorProcess.html#exit">exit</a></li><li data-type='method'><a href="TorProcess.html#get_config">get_config</a></li><li data-type='method'><a href="TorProcess.html#new_identity">new_identity</a></li><li data-type='method'><a href="TorProcess.html#set_config">set_config</a></li><li data-type='method'><a href="TorProcess.html#signal">signal</a></li></ul></li></ul><h3>Modules</h3><ul><li><a href="module-tor-router.html">tor-router</a></li><li><a href="module-tor-router_ControlServer.html">tor-router/ControlServer</a></li><li><a href="module-tor-router_default_config.html">tor-router/default_config</a></li><li><a href="module-tor-router_default_ports.html">tor-router/default_ports</a></li><li><a href="module-tor-router_DNSServer.html">tor-router/DNSServer</a></li><li><a href="module-tor-router_HTTPServer.html">tor-router/HTTPServer</a></li><li><a href="module-tor-router_launch.html">tor-router/launch</a></li><li><a href="module-tor-router_nconf_load_env.html">tor-router/nconf_load_env</a></li><li><a href="module-tor-router_SOCKSServer.html">tor-router/SOCKSServer</a></li><li><a href="module-tor-router_TorPool.html">tor-router/TorPool</a></li><li><a href="module-tor-router_TorProcess.html">tor-router/TorProcess</a></li><li><a href="module-tor-router_winston_silent_logger.html">tor-router/winston_silent_logger</a></li></ul><h3>Events</h3><ul><li><a href="DNSServer.html#event:instance-connection">instance-connection</a></li><li><a href="HTTPServer.html#event:instance-connection">instance-connection</a></li><li><a href="SOCKSServer.html#event:instance-connection">instance-connection</a></li><li><a href="TorPool.html#event:instance_created">instance_created</a></li><li><a href="TorProcess.html#event:control_listen">control_listen</a></li><li><a href="TorProcess.html#event:controller_ready">controller_ready</a></li><li><a href="TorProcess.html#event:dns_listen">dns_listen</a></li><li><a href="TorProcess.html#event:error">error</a></li><li><a href="TorProcess.html#event:process_exit">process_exit</a></li><li><a href="TorProcess.html#event:ready">ready</a></li><li><a href="TorProcess.html#event:socks_listen">socks_listen</a></li></ul><h3>Global</h3><ul><li><a href="global.html#assembleHost">assembleHost</a></li><li><a href="global.html#cleanUp">cleanUp</a></li><li><a href="global.html#env_whitelist">env_whitelist</a></li><li><a href="global.html#logger">logger</a></li><li><a href="global.html#main">main</a></li><li><a href="global.html#nconf">nconf</a></li><li><a href="global.html#REALM">REALM</a></li><li><a href="global.html#setup_nconf_env">setup_nconf_env</a></li><li><a href="global.html#TOR_ROUTER_PROXY_AGENT">TOR_ROUTER_PROXY_AGENT</a></li></ul>
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    <h1 class="page-title">DNSServer.js</h1>
    

    <section>
        <article>
            <pre class="prettyprint source linenums"><code>const dns = require('native-dns');
const { UDPServer, Request } = dns;
const Promise = require('bluebird');

/**
 * A DNS proxy server that will route requests to instances in the TorPool provided.
 * @extends UDPServer
 */
class DNSServer extends UDPServer {
	/**
	 * Binds the server to a port and IP Address.
	 * 
	 * @async
	 * @param {number} port - The port to bind to.
	 * @param {string} [host="::"] - Address to bind to. Will default to :: or 0.0.0.0 if not specified.
	 * @returns {Promise}
	 * 
	*/
	async listen() {
		let args = Array.from(arguments);
		let inner_func = super.serve;

		if (!args[1])
			args[1] = null;

		return await new Promise((resolve, reject) => {
			args.push(() => {
				let args = Array.from(arguments);
				resolve.apply(args);
			});

			try {
				inner_func.apply(this, args);
			} catch (error) {
				reject(error);
			}
		});
	}

	/**
	 * Creates an instance of `DNSServer`.
	 * @param {TorPool} tor_pool - The pool of instances that will be used for requests.
	 * @param {Object} [dns_options] - Options that will be passed to the parent constructor.
	 * @param {number} dns_timeout - How long to wait before each outbound DNS request before timing out.
	 * @param {Logger} [logger] - Winston logger that will be used for logging. If not specified will disable logging.
	 */
	constructor(tor_pool, dns_options, dns_timeout, logger) {
		/**
		 * Handles an incoming DNS request.
		 * 
		 * @function handle_request
		 * @param {Request} req - Incoming DNS request.
		 * @param {Response} res - Outgoing DNS response.
		 * @private
		 */
		const handle_request = (req, res) => {
			let connect = (tor_instance) => {
				for (let question of req.question) {
					let dns_port = (tor_instance.dns_port);
					let outbound_req = Request({
						question,
						server: { address: '127.0.0.1', port: dns_port, type: 'udp' },
						timeout: this.dns_timeout
					});

					outbound_req.on('message', (err, answer) => {
						if (!err &amp;&amp; answer) {
							for (let a of answer.answer){
								res.answer.push(a);
							}
						}
					});	

					outbound_req.on('error', (err) => {
						this.logger.error(`[dns]: an error occured while handling the request: ${err.message}`);
					});


					outbound_req.on('end', () => {
						let source = { hostname: req.address.address, port: req.address.port, proto: 'dns' };
						/**
						 * Fires when the proxy has made a connection through an instance.
						 * 
						 * @event DNSServer#instance-connection
						 * @param {TorProcess} instance - Instance that has been connected to.
						 * @param {InstanceConnectionSource} source - Details on the source of the connection.
						 */
						this.emit('instance_connection', tor_instance, source);
						this.logger.verbose(`[dns]: ${source.hostname}:${source.port} → 127.0.0.1:${dns_port}${tor_instance.definition.Name ? ' ('+tor_instance.definition.Name+')' : '' }`);
						res.send();
					});	

					outbound_req.send();
				};
			};
			if (this.tor_pool.instances.length) {
				connect(this.tor_pool.next());
			}
			else {
				this.logger.debug(`[dns]: a connection has been attempted, but no tor instances are live... waiting for an instance to come online`);
				this.tor_pool.once('instance_created', connect);
			}
		};

		super(dns_options);
		/**
		 * Winston logger
		 * @type {Logger}
		 * @public
		 */
		this.logger = logger || require('./winston_silent_logger');

		/**
		 * The pool of instances that will be used for requests.
		 * @type {TorPool}
		 * @public
		 */
		this.tor_pool = tor_pool;

		/**
		 * Timeout for each outbound DNS request
		 * @type {number}
		 * @public
		 */
		this.dns_timeout = dns_timeout;

		this.on('request', handle_request);
	}
};

/**
 * Module that contains the {@link DNSSErver} class.
 * @module tor-router/DNSServer
 * @see DNSServer
 */
module.exports = DNSServer;</code></pre>
        </article>
    </section>


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