329 lines
10 KiB
JavaScript
329 lines
10 KiB
JavaScript
const async = require('async'),
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Bzip2 = require('compressjs').Bzip2;
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class Valve extends require('./core') {
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constructor() {
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super();
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this.options.port = 27015;
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// legacy goldsrc info response -- basically not used by ANYTHING now,
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// as most (all?) goldsrc servers respond with the source info reponse
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// delete in a few years if nothing ends up using it anymore
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this.goldsrcInfo = false;
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// unfortunately, the split format from goldsrc is still around, but we
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// can detect that during the query
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this.goldsrcSplits = false;
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// some mods require a challenge, but don't provide them in the new format
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// at all, use the old dedicated challenge query if needed
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this.legacyChallenge = false;
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// cs:go provides an annoying additional bot that looks exactly like a player,
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// but is always named "Max Players"
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this.isCsGo = false;
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// 2006 engines don't pass packet switching size in split packet header
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// while all others do, this need is detected automatically
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this._skipSizeInSplitHeader = false;
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this._challenge = '';
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}
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run(state) {
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async.series([
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(c) => { this.queryInfo(state,c); },
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(c) => { this.queryChallenge(state,c); },
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(c) => { this.queryPlayers(state,c); },
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(c) => { this.queryRules(state,c); },
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(c) => { this.finish(state); }
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]);
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}
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queryInfo(state,c) {
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this.sendPacket(
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0x54,false,'Source Engine Query\0',
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this.goldsrcInfo ? 0x6D : 0x49,
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(b) => {
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const reader = this.reader(b);
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if(this.goldsrcInfo) state.raw.address = reader.string();
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else state.raw.protocol = reader.uint(1);
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state.name = reader.string();
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state.map = reader.string();
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state.raw.folder = reader.string();
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state.raw.game = reader.string();
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state.raw.steamappid = reader.uint(2);
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state.raw.numplayers = reader.uint(1);
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state.maxplayers = reader.uint(1);
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if(this.goldsrcInfo) state.raw.protocol = reader.uint(1);
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else state.raw.numbots = reader.uint(1);
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state.raw.listentype = reader.uint(1);
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state.raw.environment = reader.uint(1);
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if(!this.goldsrcInfo) {
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state.raw.listentype = String.fromCharCode(state.raw.listentype);
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state.raw.environment = String.fromCharCode(state.raw.environment);
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}
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state.password = !!reader.uint(1);
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if(this.goldsrcInfo) {
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state.raw.ismod = reader.uint(1);
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if(state.raw.ismod) {
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state.raw.modlink = reader.string();
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state.raw.moddownload = reader.string();
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reader.skip(1);
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state.raw.modversion = reader.uint(4);
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state.raw.modsize = reader.uint(4);
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state.raw.modtype = reader.uint(1);
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state.raw.moddll = reader.uint(1);
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}
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}
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state.raw.secure = reader.uint(1);
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if(this.goldsrcInfo) {
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state.raw.numbots = reader.uint(1);
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} else {
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if(state.raw.folder === 'ship') {
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state.raw.shipmode = reader.uint(1);
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state.raw.shipwitnesses = reader.uint(1);
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state.raw.shipduration = reader.uint(1);
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}
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state.raw.version = reader.string();
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const extraFlag = reader.uint(1);
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if(extraFlag & 0x80) state.raw.port = reader.uint(2);
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if(extraFlag & 0x10) state.raw.steamid = reader.uint(8);
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if(extraFlag & 0x40) {
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state.raw.sourcetvport = reader.uint(2);
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state.raw.sourcetvname = reader.string();
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}
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if(extraFlag & 0x20) state.raw.tags = reader.string();
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if(extraFlag & 0x01) state.raw.gameid = reader.uint(8);
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}
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// from https://developer.valvesoftware.com/wiki/Server_queries
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if(
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state.raw.protocol === 7 && (
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state.raw.steamappid === 215
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|| state.raw.steamappid === 17550
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|| state.raw.steamappid === 17700
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|| state.raw.steamappid === 240
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)
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) {
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this._skipSizeInSplitHeader = true;
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}
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if(this.debug) {
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console.log("STEAM APPID: "+state.raw.steamappid);
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console.log("PROTOCOL: "+state.raw.protocol);
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}
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if(state.raw.protocol === 48) {
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if(this.debug) console.log("GOLDSRC DETECTED - USING MODIFIED SPLIT FORMAT");
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this.goldsrcSplits = true;
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}
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c();
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}
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);
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}
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queryChallenge(state,c) {
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if(this.legacyChallenge) {
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this.sendPacket(0x57,false,false,0x41,(b) => {
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// sendPacket will catch the response packet and
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// save the challenge for us
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c();
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});
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} else {
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c();
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}
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}
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queryPlayers(state,c) {
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this.sendPacket(0x55,true,false,0x44,(b) => {
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const reader = this.reader(b);
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const num = reader.uint(1);
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for(let i = 0; i < num; i++) {
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reader.skip(1);
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const name = reader.string();
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const score = reader.int(4);
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const time = reader.float();
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if(this.debug) console.log("Found player: "+name+" "+score+" "+time);
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// connecting players don't count as players.
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if(!name) continue;
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(time === -1 ? state.bots : state.players).push({
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name:name, score:score, time:time
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});
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}
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if(this.isCsGo && state.players.length === 1 && state.players[0].name === 'Max Players') {
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if(this.debug) console.log("CSGO server using limited player details");
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state.players = [];
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for(let i = 0; i < state.raw.numplayers; i++) {
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state.players.push({});
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}
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}
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// if we didn't find the bots, iterate
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// through and guess which ones they are
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if(!state.bots.length && state.raw.numbots) {
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let maxTime = 0;
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for (const player of state.players) {
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maxTime = Math.max(player.time,maxTime);
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}
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for(let i = 0; i < state.players.length; i++) {
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const player = state.players[i];
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if(state.bots.length >= state.raw.numbots) continue;
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if(player.time !== maxTime) continue;
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state.bots.push(player);
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state.players.splice(i, 1);
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i--;
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}
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}
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c();
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});
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}
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queryRules(state,c) {
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this.sendPacket(0x56,true,false,0x45,(b) => {
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const reader = this.reader(b);
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const num = reader.uint(2);
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state.raw.rules = {};
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for(let i = 0; i < num; i++) {
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const key = reader.string();
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const value = reader.string();
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state.raw.rules[key] = value;
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}
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c();
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}, () => {
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// no rules were returned after timeout --
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// the server probably has them disabled
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// ignore the timeout
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c();
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return true;
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});
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}
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sendPacket(type,sendChallenge,payload,expect,callback,ontimeout) {
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const packetStorage = {};
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const receivedFull = (reader) => {
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const type = reader.uint(1);
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if(type === 0x41) {
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if(this.debug) console.log('Received challenge key');
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if(this._challenge) return this.fatal('Received more than one challenge key');
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this._challenge = reader.uint(4);
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if(sendChallenge) {
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if(this.debug) console.log('Restarting query');
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send();
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return true;
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}
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}
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if(this.debug) console.log("Received "+type.toString(16)+" expected "+expect.toString(16));
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if(type !== expect) return;
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callback(reader.rest());
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return true;
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};
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const receivedOne = (buffer) => {
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const reader = this.reader(buffer);
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const header = reader.int(4);
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if(header === -1) {
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// full package
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if(this.debug) console.log("Received full packet");
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return receivedFull(reader);
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}
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if(header === -2) {
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// partial package
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const uid = reader.uint(4);
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if(!(uid in packetStorage)) packetStorage[uid] = {};
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const packets = packetStorage[uid];
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let bzip = false;
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if(!this.goldsrcSplits && uid & 0x80000000) bzip = true;
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let packetNum,payload,numPackets;
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if(this.goldsrcSplits) {
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packetNum = reader.uint(1);
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numPackets = packetNum & 0x0f;
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packetNum = (packetNum & 0xf0) >> 4;
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payload = reader.rest();
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} else {
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numPackets = reader.uint(1);
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packetNum = reader.uint(1);
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if(!this._skipSizeInSplitHeader) reader.skip(2);
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if(packetNum === 0 && bzip) reader.skip(8);
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payload = reader.rest();
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}
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packets[packetNum] = payload;
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if(this.debug) {
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console.log("Received partial packet uid:"+uid+" num:"+packetNum);
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console.log("Received "+Object.keys(packets).length+'/'+numPackets+" packets for this UID");
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}
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if(Object.keys(packets).length !== numPackets) return;
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// assemble the parts
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const list = [];
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for(let i = 0; i < numPackets; i++) {
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if(!(i in packets)) {
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this.fatal('Missing packet #'+i);
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return true;
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}
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list.push(packets[i]);
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}
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let assembled = Buffer.concat(list);
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if(bzip) {
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if(this.debug) console.log("BZIP DETECTED - Extracing packet...");
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try {
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assembled = Buffer.from(Bzip2.decompressFile(assembled));
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} catch(e) {
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this.fatal('Invalid bzip packet');
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return true;
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}
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}
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const assembledReader = this.reader(assembled);
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assembledReader.skip(4); // header
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return receivedFull(assembledReader);
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}
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};
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const send = (c) => {
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if(typeof payload === 'string') payload = Buffer.from(payload,'binary');
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const challengeLength = sendChallenge ? 4 : 0;
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const payloadLength = payload ? payload.length : 0;
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const b = Buffer.alloc(5 + challengeLength + payloadLength);
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b.writeInt32LE(-1, 0);
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b.writeUInt8(type, 4);
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if(sendChallenge) {
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let challenge = this._challenge;
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if(!challenge) challenge = 0xffffffff;
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if(this.byteorder === 'le') b.writeUInt32LE(challenge, 5);
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else b.writeUInt32BE(challenge, 5);
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}
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if(payloadLength) payload.copy(b, 5+challengeLength);
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this.udpSend(b,receivedOne,ontimeout);
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};
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send();
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}
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}
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module.exports = Valve;
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