404 lines
14 KiB
JavaScript
404 lines
14 KiB
JavaScript
const Bzip2 = require('compressjs').Bzip2,
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Core = require('./core');
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class Valve extends Core {
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constructor() {
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super();
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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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// 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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async run(state) {
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if (!this.options.port) this.options.port = 27015;
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await this.queryInfo(state);
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await this.queryChallenge();
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await this.queryPlayers(state);
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await this.queryRules(state);
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await this.cleanup(state);
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}
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async queryInfo(state) {
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this.debugLog("Requesting info ...");
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const b = await this.sendPacket(
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0x54,
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'Source Engine Query\0',
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this.goldsrcInfo ? 0x6D : 0x49,
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false
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);
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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.gamePort = 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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this.logger.debug("INFO: ", state.raw);
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if(state.raw.protocol === 48) {
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this.logger.debug("GOLDSRC DETECTED - USING MODIFIED SPLIT FORMAT");
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this.goldsrcSplits = true;
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}
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}
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async queryChallenge() {
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if(this.legacyChallenge) {
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// sendPacket will catch the response packet and
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// save the challenge for us
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this.debugLog("Requesting legacy challenge key ...");
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await this.sendPacket(
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0x57,
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null,
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0x41,
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false
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);
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}
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}
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async queryPlayers(state) {
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state.raw.players = [];
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this.debugLog("Requesting player list ...");
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const b = await this.sendPacket(
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0x55,
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null,
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0x44,
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true
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);
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if (b === null) {
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// Player query timed out
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// CSGO doesn't respond to player query if host_players_show is not 2
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// Conan Exiles never responds to player query
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// Just skip it, and we'll fill with dummy objects in cleanup()
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return;
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}
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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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this.debugLog("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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// CSGO sometimes adds a bot named 'Max Players' if host_players_show is not 2
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if (state.raw.steamappid === 730 && name === 'Max Players') continue;
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state.raw.players.push({
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name:name, score:score, time:time
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});
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}
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}
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async queryRules(state) {
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state.raw.rules = {};
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this.debugLog("Requesting rules ...");
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const b = await this.sendPacket(0x56,null,0x45,true);
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if (b === null) return; // timed out - the server probably has rules disabled
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const reader = this.reader(b);
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const num = reader.uint(2);
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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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}
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async cleanup(state) {
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// Battalion 1944 puts its info into rules fields for some reason
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if ('bat_name_s' in state.raw.rules) {
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state.name = state.raw.rules.bat_name_s;
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delete state.raw.rules.bat_name_s;
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if ('bat_player_count_s' in state.raw.rules) {
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state.raw.numplayers = parseInt(state.raw.rules.bat_player_count_s);
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delete state.raw.rules.bat_player_count_s;
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}
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if ('bat_max_players_i' in state.raw.rules) {
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state.maxplayers = parseInt(state.raw.rules.bat_max_players_i);
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delete state.raw.rules.bat_max_players_i;
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}
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if ('bat_has_password_s' in state.raw.rules) {
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state.password = state.raw.rules.bat_has_password_s === 'Y';
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delete state.raw.rules.bat_has_password_s;
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}
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// apparently map is already right, and this var is often wrong
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delete state.raw.rules.bat_map_s;
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}
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// Organize players / hidden players into player / bot arrays
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const botProbability = (p) => {
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if (p.time === -1) return Number.MAX_VALUE;
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return p.time;
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};
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const sortedPlayers = state.raw.players.sort((a,b) => {
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return botProbability(a) - botProbability(b);
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});
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delete state.raw.players;
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const numBots = state.raw.numbots;
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const numPlayers = state.raw.numplayers - numBots;
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while(state.bots.length < numBots) {
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if (sortedPlayers.length) state.bots.push(sortedPlayers.pop());
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else state.bots.push({});
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}
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while(state.players.length < numPlayers || sortedPlayers.length) {
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if (sortedPlayers.length) state.players.push(sortedPlayers.pop());
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else state.players.push({});
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}
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}
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/**
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* Sends a request packet and returns only the response type expected
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* @param {number} type
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* @param {boolean} sendChallenge
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* @param {?string|Buffer} payload
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* @param {number} expect
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* @param {boolean=} allowTimeout
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* @returns Buffer|null
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**/
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async sendPacket(
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type,
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payload,
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expect,
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allowTimeout
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) {
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for (let keyRetry = 0; keyRetry < 3; keyRetry++) {
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let receivedNewChallengeKey = false;
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const response = await this.sendPacketRaw(
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type, payload,
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(payload) => {
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const reader = this.reader(payload);
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const type = reader.uint(1);
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this.debugLog(() => "Received 0x" + type.toString(16) + " expected 0x" + expect.toString(16));
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if (type === 0x41) {
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const key = reader.uint(4);
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if (this._challenge !== key) {
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this.debugLog('Received new challenge key: 0x' + key.toString(16));
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this._challenge = key;
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receivedNewChallengeKey = true;
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}
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}
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if (type === expect) {
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return reader.rest();
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} else if (receivedNewChallengeKey) {
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return null;
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}
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},
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() => {
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if (allowTimeout) return null;
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}
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);
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if (!receivedNewChallengeKey) {
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return response;
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}
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}
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throw new Error('Received too many challenge key responses');
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}
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/**
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* Sends a request packet and assembles partial responses
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* @param {number} type
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* @param {boolean} sendChallenge
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* @param {?string|Buffer} payload
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* @param {function(Buffer)} onResponse
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* @param {function()} onTimeout
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**/
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async sendPacketRaw(
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type,
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payload,
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onResponse,
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onTimeout
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) {
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const challengeAtBeginning = type === 0x55 || type === 0x56;
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const challengeAtEnd = type === 0x54 && !!this._challenge;
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if (typeof payload === 'string') payload = Buffer.from(payload, 'binary');
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const b = Buffer.alloc(5
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+ (challengeAtBeginning ? 4 : 0)
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+ (challengeAtEnd ? 4 : 0)
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+ (payload ? payload.length : 0)
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);
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let offset = 0;
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let challenge = this._challenge;
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if (!challenge) challenge = 0xffffffff;
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b.writeInt32LE(-1, offset);
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offset += 4;
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b.writeUInt8(type, offset);
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offset += 1;
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if (challengeAtBeginning) {
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if (this.byteorder === 'le') b.writeUInt32LE(challenge, offset);
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else b.writeUInt32BE(challenge, offset);
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offset += 4;
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}
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if (payload) {
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payload.copy(b, offset);
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offset += payload.length;
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}
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if (challengeAtEnd) {
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if (this.byteorder === 'le') b.writeUInt32LE(challenge, offset);
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else b.writeUInt32BE(challenge, offset);
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offset += 4;
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}
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const packetStorage = {};
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return await this.udpSend(
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b,
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(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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this.debugLog("Received full packet");
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return onResponse(reader.rest());
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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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this.debugLog(() => "Received partial packet uid: 0x"+uid.toString(16)+" num: "+packetNum);
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this.debugLog(() => "Received "+Object.keys(packets).length+'/'+numPackets+" packets for this UID");
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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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throw new Error('Missing packet #'+i);
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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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this.debugLog("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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throw new Error('Invalid bzip packet');
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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 onResponse(assembledReader.rest());
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}
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},
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onTimeout
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);
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}
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}
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module.exports = Valve;
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