From 898fed76c6ccdc3cd175be96369a6a6126c37c2c Mon Sep 17 00:00:00 2001
From: David White <david@rartm.co.uk>
Date: Thu, 9 Oct 2014 16:46:12 +0100
Subject: [PATCH] Add initial support for identd

---
 config.js     | 29 +++++++++++++++++++
 src/client.js | 17 ++++++++++++
 src/identd.js | 77 +++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 123 insertions(+)
 create mode 100644 src/identd.js

diff --git a/config.js b/config.js
index 4e41abb6..dc3840d7 100644
--- a/config.js
+++ b/config.js
@@ -176,5 +176,34 @@ module.exports = {
 		// @default  ""
 		//
 		certificate: ""
+	},
+
+	//
+	// Allows shout to run as an identd
+	//
+	// @type     object
+	// @default  {}
+	identd: {
+		//
+		// Enable Identd daemon
+		//
+		// @type     boolean
+		// @default  true
+		enable: true,
+
+		//
+		// Port to listen for ident requests
+		//
+		// @type     int
+		// @default  30113
+		port: 30113,
+
+		//
+		// Default user to return on unknown request
+		// if false, will return NOUSER
+		//
+		// @type     string
+		// @default  shout
+		default: "shout"
 	}
 };
diff --git a/src/client.js b/src/client.js
index 55ef0996..a842ac34 100644
--- a/src/client.js
+++ b/src/client.js
@@ -8,6 +8,7 @@ var Network = require("./models/network");
 var slate = require("slate-irc");
 var tls = require("tls");
 var Helper = require("./helper");
+var identd = require("./identd");
 
 module.exports = Client;
 
@@ -137,9 +138,25 @@ Client.prototype.connect = function(args) {
 		});
 	});
 
+
 	var nick = args.nick || "shout-user";
 	var username = args.username || nick;
 	var realname = args.realname || "Shout User";
+	var identdItem = null;
+
+	stream.on("connect", function() {
+		identdItem = {
+			"remoteIp": stream.remoteAddress,
+			"remotePort": stream.remotePort,
+			"localPort": stream.localPort,
+			"username": username
+		};
+		identd.addConnection(identdItem);
+	});
+
+	stream.on("close", function() {
+		identd.addConnection(identdItem);
+	});
 
 	var irc = slate(stream);
 
diff --git a/src/identd.js b/src/identd.js
new file mode 100644
index 00000000..7b5b147e
--- /dev/null
+++ b/src/identd.js
@@ -0,0 +1,77 @@
+var _ = require("lodash");
+var net = require("net");
+var Helper = require("./helper");
+
+function Identd() {
+	// used to store who is connecting...
+	this.connections = [];
+	this.server = null;
+	this.config = {
+		enabled: false,
+		port: 30113,
+		default: "shout"
+	};
+};
+
+Identd.prototype.respond = function(remoteIp, localPort, remotePort) {
+	// Build the first part (always the same)
+	var response = localPort + ", " + remotePort + " : ";
+	var connection = _.where(this.connections, {"remoteIp": remoteIp, "remotePort": remotePort, "localPort": localPort});
+
+	if (connection.length > 0) {
+		// We have some connections, but we only want the first
+		connection = _.first(connection);
+		response += " USERID : UNIX : " + connection.username;
+		// We're done with that connection. Remove it
+		this.removeConnection(connection);
+	} else {
+		response += " ERROR : NOUSER";
+	}
+	// responses must end with CR+LF
+	return response + "\r\n";
+};
+
+Identd.prototype.parse = function(request) {
+	// myPort, theirPort\r\n
+	request = request.split(/,\s*/);
+	if (request.length == 2) {
+		var localPort = parseInt(request[0]),
+			remotePort = parseInt(request[1]);
+	}
+	return [localPort, remotePort];
+};
+
+Identd.prototype.start = function(config) {
+	_.merge(this.config, config.identd);
+
+	if (this.config.enabled) {
+		var self = this;
+
+		// create the server
+		this.server = net.createServer(function(socket) {
+			socket.on('data', function(data) {
+				var parsed = this.parse(data);
+				// parse and generate a response
+				var response = this.respond(socket.remoteAddress, parsed[0], parsed[1]);
+				socket.write(response);
+				socket.end();
+			});
+		});
+		console.log("Starting identd on " + this.config.port);
+		this.server.listen(this.config.port);
+	}
+
+	return self;
+};
+
+Identd.prototype.addConnection = function(connection) {
+	if (this.config.enabled)
+		this.connections.push(connection);
+};
+
+Identd.prototype.removeConnection = function(connection) {
+	if (this.config.enabled)
+		this.connections = _.without(this.connections, connection);
+};
+
+module.exports = new Identd().start(Helper.getConfig());