311 lines
7.5 KiB
JavaScript
311 lines
7.5 KiB
JavaScript
const EventEmitter = require('events').EventEmitter,
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dns = require('dns'),
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net = require('net'),
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async = require('async'),
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Reader = require('../lib/reader');
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class Core extends EventEmitter {
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constructor() {
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super();
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this.options = {
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tcpTimeout: 1000,
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udpTimeout: 1000
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};
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this.maxAttempts = 1;
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this.attempt = 1;
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this.finished = false;
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this.encoding = 'utf8';
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this.byteorder = 'le';
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this.delimiter = '\0';
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this.globalTimeoutTimer = setTimeout(() => {
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this.fatal('timeout');
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},10000);
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}
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fatal(err,noretry) {
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if(!noretry && this.attempt < this.maxAttempts) {
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this.attempt++;
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this.start();
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return;
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}
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this.done({error: err.toString()});
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}
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initState() {
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return {
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name: '',
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map: '',
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password: false,
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raw: {},
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maxplayers: 0,
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players: [],
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bots: []
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};
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}
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finalizeState(state) {}
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finish(state) {
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this.finalizeState(state);
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this.done(state);
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}
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done(state) {
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if(this.finished) return;
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clearTimeout(this.globalTimeoutTimer);
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if(this.options.notes)
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state.notes = this.options.notes;
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state.query = {};
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if('host' in this.options) state.query.host = this.options.host;
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if('address' in this.options) state.query.address = this.options.address;
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if('port' in this.options) state.query.port = this.options.port;
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if('port_query' in this.options) state.query.port_query = this.options.port_query;
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state.query.type = this.type;
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if('pretty' in this) state.query.pretty = this.pretty;
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this.reset();
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this.finished = true;
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this.emit('finished',state);
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if(this.options.callback) this.options.callback(state);
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}
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reset() {
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if(this.timers) {
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for (const timer of this.timers) {
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clearTimeout(timer);
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}
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}
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this.timers = [];
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if(this.tcpSocket) {
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this.tcpSocket.destroy();
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delete this.tcpSocket;
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}
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this.udpTimeoutTimer = false;
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this.udpCallback = false;
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}
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start() {
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const options = this.options;
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this.reset();
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async.series([
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(c) => {
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// resolve host names
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if(!('host' in options)) return c();
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if(options.host.match(/\d+\.\d+\.\d+\.\d+/)) {
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options.address = options.host;
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c();
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} else {
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this.parseDns(options.host,c);
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}
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},
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(c) => {
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// calculate query port if needed
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if(!('port_query' in options) && 'port' in options) {
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const offset = options.port_query_offset || 0;
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options.port_query = options.port + offset;
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}
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c();
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},
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(c) => {
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// run
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this.run(this.initState());
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}
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]);
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}
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parseDns(host,c) {
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const resolveStandard = (host,c) => {
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dns.lookup(host, (err,address,family) => {
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if(err) return this.fatal(err);
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this.options.address = address;
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c();
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});
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};
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const resolveSrv = (srv,host,c) => {
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dns.resolve(srv+'.'+host, 'SRV', (err,addresses) => {
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if(err) return resolveStandard(host,c);
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if(addresses.length >= 1) {
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const line = addresses[0];
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this.options.port = line.port;
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const srvhost = line.name;
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if(srvhost.match(/\d+\.\d+\.\d+\.\d+/)) {
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this.options.address = srvhost;
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c();
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} else {
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// resolve yet again
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resolveStandard(srvhost,c);
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}
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return;
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}
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return resolveStandard(host,c);
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});
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};
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if(this.srvRecord) resolveSrv(this.srvRecord,host,c);
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else resolveStandard(host,c);
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}
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// utils
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/** @returns {Reader} */
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reader(buffer) {
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return new Reader(this,buffer);
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}
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translate(obj,trans) {
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for(const from of Object.keys(trans)) {
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const to = trans[from];
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if(from in obj) {
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if(to) obj[to] = obj[from];
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delete obj[from];
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}
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}
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}
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setTimeout(c,t) {
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if(this.finished) return 0;
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const id = setTimeout(c,t);
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this.timers.push(id);
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return id;
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}
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trueTest(str) {
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if(typeof str === 'boolean') return str;
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if(typeof str === 'number') return str !== 0;
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if(typeof str === 'string') {
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if(str.toLowerCase() === 'true') return true;
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if(str === 'yes') return true;
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if(str === '1') return true;
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}
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return false;
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}
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debugBuffer(buffer) {
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let out = '';
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let out2 = '';
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for(let i = 0; i < buffer.length; i++) {
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const sliced = buffer.slice(i,i+1);
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out += sliced.toString('hex')+' ';
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let chr = sliced.toString();
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if(chr < ' ' || chr > '~') chr = ' ';
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out2 += chr+' ';
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if(out.length > 60) {
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console.log(out);
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console.log(out2);
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out = out2 = '';
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}
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}
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console.log(out);
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console.log(out2);
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}
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_tcpConnect(c) {
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if(this.tcpSocket) return c(this.tcpSocket);
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let connected = false;
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let received = Buffer.from([]);
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const address = this.options.address;
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const port = this.options.port_query;
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const socket = this.tcpSocket = net.connect(port,address,() => {
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if(this.debug) console.log(address+':'+port+" TCPCONNECTED");
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connected = true;
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c(socket);
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});
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socket.setTimeout(10000);
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socket.setNoDelay(true);
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if(this.debug) console.log(address+':'+port+" TCPCONNECT");
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const writeHook = socket.write;
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socket.write = (...args) => {
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if(this.debug) console.log(address+':'+port+" TCP--> "+args[0].toString('hex'));
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writeHook.apply(socket,args);
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};
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socket.on('error', () => {});
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socket.on('close', () => {
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if(!this.tcpCallback) return;
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if(connected) return this.fatal('Socket closed while waiting on TCP');
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else return this.fatal('TCP Connection Refused');
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});
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socket.on('data', (data) => {
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if(!this.tcpCallback) return;
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if(this.debug) console.log(address+':'+port+" <--TCP "+data.toString('hex'));
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received = Buffer.concat([received,data]);
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if(this.tcpCallback(received)) {
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clearTimeout(this.tcpTimeoutTimer);
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this.tcpCallback = false;
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received = Buffer.from([]);
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}
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});
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}
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tcpSend(buffer,ondata) {
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process.nextTick(() => {
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if(this.tcpCallback) return this.fatal('Attempted to send TCP packet while still waiting on a managed response');
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this._tcpConnect((socket) => {
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socket.write(buffer);
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});
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if(!ondata) return;
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this.tcpTimeoutTimer = this.setTimeout(() => {
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this.tcpCallback = false;
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this.fatal('TCP Watchdog Timeout');
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},this.options.tcpTimeout);
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this.tcpCallback = ondata;
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});
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}
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udpSend(buffer,onpacket,ontimeout) {
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process.nextTick(() => {
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if(this.udpCallback) return this.fatal('Attempted to send UDP packet while still waiting on a managed response');
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this._udpSendNow(buffer);
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if(!onpacket) return;
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this.udpTimeoutTimer = this.setTimeout(() => {
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this.udpCallback = false;
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let timeout = false;
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if(!ontimeout || ontimeout() !== true) timeout = true;
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if(timeout) this.fatal('UDP Watchdog Timeout');
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},this.options.udpTimeout);
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this.udpCallback = onpacket;
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});
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}
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_udpSendNow(buffer) {
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if(!('port_query' in this.options)) return this.fatal('Attempted to send without setting a port');
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if(!('address' in this.options)) return this.fatal('Attempted to send without setting an address');
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if(typeof buffer === 'string') buffer = Buffer.from(buffer,'binary');
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if(this.debug) console.log(this.options.address+':'+this.options.port_query+" UDP--> "+buffer.toString('hex'));
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this.udpSocket.send(buffer,0,buffer.length,this.options.port_query,this.options.address);
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}
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_udpResponse(buffer) {
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if(this.udpCallback) {
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const result = this.udpCallback(buffer);
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if(result === true) {
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// we're done with this udp session
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clearTimeout(this.udpTimeoutTimer);
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this.udpCallback = false;
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}
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} else {
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this.udpResponse(buffer);
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}
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}
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udpResponse() {}
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}
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module.exports = Core;
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