Code cleanup
Much better organization and ease-of-use now that the proof of concept is established. Still an awful lot to do here, but I'm getting the hang of the whole node.js thing. Also moved the actual test functionality out to a test script so the module itself doesn't execute anything.
This commit is contained in:
Parnic
238
index.js
238
index.js
@ -1,108 +1,186 @@
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var dgram = require('dgram');
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var dgram = require('dgram');
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var net = require('net');
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const SmartBuffer = require('smart-buffer').SmartBuffer;
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const EventEmitter = require('events');
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var server = dgram.createSocket("udp4");
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server.bind( function() {
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server.setBroadcast(true)
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server.setMulticastTTL(128);
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broadcastNew();
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});
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class SLMessage extends SmartBuffer {
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constructor(senderId, messageId) {
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super();
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this.writeUInt16LE(senderId);
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this.writeUInt16LE(messageId);
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server.on('message', function (message, remote) {
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console.log('Got a response.');
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var server = {
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address: remote.address,
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type: message.readInt32LE(0),
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port: message.readInt16LE(8),
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gatewayType: message.readUInt8(10),
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gatewaySubtype: message.readUInt8(11),
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gatewayName: message.toString('utf8', 12, 28)
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};
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console.log(' type: ' + server.type + ', host: ' + server.address + ':' + server.port + ', identified as ' + server.gatewayName);
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if (server.type === 2) {
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connectTo(server);
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this._wroteSize = false;
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}
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});
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function broadcastNew() {
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var message = new Uint8Array(8);
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message[0] = 1;
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server.send(message, 0, message.length, 1444, "255.255.255.255");
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console.log("Looking for ScreenLogic hosts...");
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toBuffer() {
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if (this._wroteSize === false) {
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this.insertInt32LE(this.length - 4, 4);
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this._wroteSize = true;
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} else {
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this.writeInt32LE(this.length - 8, 4);
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}
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return super.toBuffer();
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}
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writeSLString(str) {
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this.writeInt32LE(str.length);
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this.writeString(str);
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this.skip(4 - (str.length % 4));
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}
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writeSLBuffer(buf) {
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this.writeInt32LE(buf.length);
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this.writeBuffer(buf);
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}
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skip(num) {
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if (num > 0) {
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this.writeBuffer(Buffer.alloc(num));
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}
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}
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}
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function connectTo(server) {
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console.log("connecting...");
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var client = new net.Socket();
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client.connect(server.port, server.address, function() {
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class FindUnits extends EventEmitter {
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constructor() {
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super();
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this.finder = dgram.createSocket('udp4');
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var _this = this;
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this.finder.on('message', function (message, remote) {
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_this.foundServer(message, remote);
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}).on('close', function() {
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console.log('finder closed');
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});
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}
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search() {
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var _this = this;
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this.finder.bind(function() {
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_this.finder.setBroadcast(true);
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_this.finder.setMulticastTTL(128);
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_this.sendServerBroadcast();
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});
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}
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foundServer(message, remote) {
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console.log('Found something');
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var server = {
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address: remote.address,
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type: message.readInt32LE(0),
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port: message.readInt16LE(8),
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gatewayType: message.readUInt8(10),
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gatewaySubtype: message.readUInt8(11),
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gatewayName: message.toString('utf8', 12, 28)
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};
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console.log(' type: ' + server.type + ', host: ' + server.address + ':' + server.port + ', identified as ' + server.gatewayName);
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if (server.type === 2) {
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this.emit('serverFound', server);
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}
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}
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sendServerBroadcast() {
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var message = new Uint8Array(8);
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message[0] = 1;
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this.finder.send(message, 0, message.length, 1444, "255.255.255.255");
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console.log("Looking for ScreenLogic hosts...");
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}
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close() {
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this.finder.close();
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}
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}
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class UnitConnection extends EventEmitter {
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constructor(server) {
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super();
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this.server = server;
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this.client = new net.Socket();
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var _this = this;
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this.client.on('data', function(msg) {
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_this.onClientMessage(msg);
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}).on('close', function(had_error) {
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console.log('unit connection closed');
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});
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}
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close() {
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this.client.end();
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}
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connect() {
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console.log("connecting...");
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var _this = this;
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this.client.connect(this.server.port, this.server.address, function() {
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_this.onConnected();
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});
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}
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onConnected() {
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console.log('connected');
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console.log('sending connection string...');
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var buf = Buffer.from('CONNECTSERVERHOST\r\n\r\n');
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client.write(buf);
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console.log('sending init message...');
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this.client.write('CONNECTSERVERHOST\r\n\r\n');
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console.log('sending challenge string...');
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buf = Buffer.alloc(8);
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buf.writeUInt16LE(14, 2);
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client.write(buf);
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console.log('sending challenge message...');
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var buf = new SLMessage(0, 14);
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this.client.write(buf.toBuffer());
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}
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console.log('sending login string...');
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buf = Buffer.alloc(72);
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buf.writeUInt16LE(0);
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buf.writeUInt16LE(27, 2);
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buf.writeInt32LE(64, 4); // length
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buf.writeInt32LE(348, 8); // schema
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buf.writeInt32LE(0, 12); // connection type
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var name = 'ScreenLogicConnect library';
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buf.writeInt32LE(name.length, 16);
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buf.write(name, 20);
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var pos = 20 + name.length;
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for (var i = 0; i < 4 - (name.length % 4); i++) {
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buf.writeUInt8(0, 20 + name.length + i);
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pos = pos + 1;
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}
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buf.writeInt32LE(16, pos);
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pos += 4;
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pos += 16;
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buf.writeInt32LE(2, pos);
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client.write(buf);
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login() {
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console.log('sending login message...');
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var buf = new SLMessage(0, 27);
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buf.writeInt32LE(348); // schema
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buf.writeInt32LE(0); // connection type
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buf.writeSLString('ScreenLogicConnect library'); // version
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buf.writeSLBuffer(Buffer.alloc(16)); // encoded password. empty/unused for local connections
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buf.writeInt32LE(2); // procID
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this.client.write(buf.toBuffer());
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}
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getPoolStatus() {
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console.log('sending pool status query...');
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buf = Buffer.alloc(12);
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buf.writeUInt16LE(12526, 2);
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buf.writeInt32LE(4, 4);
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client.write(buf);
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var buf = new SLMessage(0, 12526);
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buf.writeInt32LE(0);
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this.client.write(buf.toBuffer());
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}
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parsePoolStatus(msg) {
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// todo: actually parse the message
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this.emit('poolStatus', {});
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}
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getControllerConfig() {
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console.log('sending controller config query...');
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buf = Buffer.alloc(16);
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buf.writeUInt16LE(12532, 2);
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buf.writeInt32LE(8, 4);
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client.write(buf);
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var buf = new SLMessage(0, 12532);
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buf.writeInt32LE(0);
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buf.writeInt32LE(0);
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this.client.write(buf.toBuffer());
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}
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setTimeout(function() {
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console.log('destroying');
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client.destroy();
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}, 3000);
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});
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parseControllerConfig(msg) {
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// todo: actually parse the message
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this.emit('controllerConfig', {});
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}
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client.on('close', function() {
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console.log('closed');
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});
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client.on('data', function(msg) {
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onClientMessage(msg) {
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console.log('received message of length ' + msg.length);
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var msgType = msg.readInt16LE(2);
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if (msgType === 15) {
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console.log(" it's a challenge response");
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this.login();
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} else if (msgType === 28) {
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console.log(" it's a login response");
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this.emit('loggedIn');
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} else if (msgType === 12527) {
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console.log(" it's pool status");
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this.parsePoolStatus(msg);
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} else if (msgType === 12533) {
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console.log(" it's controller configuration");
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this.parseControllerConfig(msg);
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}
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});
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}
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}
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/* debug print full buffer contents:
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@ -110,3 +188,9 @@ for (const value of buf.values()) {
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console.log(value.toString(16));
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}
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*/
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module.exports = {
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FindUnits,
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SLMessage,
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UnitConnection
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}
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