459 lines
14 KiB
JavaScript
459 lines
14 KiB
JavaScript
import Bzip2 from 'seek-bzip'
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import Core from './core.js'
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import { Buffer } from 'node:buffer'
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const AppId = {
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Squad: 393380,
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Bat1944: 489940,
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Ship: 2400,
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Rust: 252490,
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CSGO: 730,
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CS_Source: 240,
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EternalSilence: 17550,
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Insurgency_MIC: 17700,
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Source_SDK_Base_2006: 215
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}
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export default 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 (/** Results */ state) {
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this.logger.debug('Requesting info ...')
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const b = await this.sendPacket(
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this.goldsrcInfo ? undefined : 0x54,
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this.goldsrcInfo ? 'details' : '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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if (!this.goldsrcInfo) state.raw.appId = reader.uint(2)
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state.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 = String.fromCharCode(reader.uint(1))
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state.raw.environment = String.fromCharCode(reader.uint(1))
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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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} else {
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state.raw.secure = reader.uint(1)
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if (state.raw.appId === AppId.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.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).toString()
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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().split(',')
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if (extraFlag & 0x01) {
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const gameId = reader.uint(8)
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const betterAppId = gameId.getLowBitsUnsigned() & 0xffffff
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if (betterAppId) {
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state.raw.appId = betterAppId
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}
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}
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}
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const appId = state.raw.appId
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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.appId === AppId.Source_SDK_Base_2006 ||
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state.raw.appId === AppId.EternalSilence ||
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state.raw.appId === AppId.Insurgency_MIC ||
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state.raw.appId === AppId.CS_Source
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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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if (appId === AppId.Rust) {
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if (state.raw.tags) {
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for (const tag of state.raw.tags) {
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if (tag.startsWith('mp')) {
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const value = parseInt(tag.replace('mp', ''))
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if (!isNaN(value)) {
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state.maxplayers = value
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}
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}
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}
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}
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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.logger.debug('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 (/** Results */ state) {
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state.raw.players = []
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this.logger.debug('Requesting player list ...')
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const b = await this.sendPacket(
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this.goldsrcInfo ? undefined : 0x55,
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this.goldsrcInfo ? 'players' : null,
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0x44,
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true
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)
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if (b === null && !this.options.requestPlayersRequired) {
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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.logger.debug('Found player: ' + name + ' ' + score + ' ' + time)
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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.appId === AppId.CSGO && name === 'Max Players') continue
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state.raw.players.push({
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name, score, time
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})
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}
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}
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async queryRules (/** Results */ state) {
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const appId = state.raw.appId
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if (appId === AppId.Squad ||
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appId === AppId.Bat1944 ||
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this.options.requestRules) {
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// let's get 'em
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} else {
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return
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}
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const rules = {}
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state.raw.rules = rules
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this.logger.debug('Requesting rules ...')
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if (this.goldsrcInfo) {
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const b = await this.udpSend('\xff\xff\xff\xffrules', b => b, () => null)
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if (b === null && !this.options.requestRulesRequired) return // timed out - the server probably has rules disabled
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const reader = this.reader(b)
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while (!reader.done()) {
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const key = reader.string()
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rules[key] = reader.string()
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}
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} else {
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const b = await this.sendPacket(0x56, null, 0x45, true)
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if (b === null && !this.options.requestRulesRequired) 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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rules[key] = reader.string()
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}
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}
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// Battalion 1944 puts its info into rules fields for some reason
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if (appId === AppId.Bat1944) {
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if ('bat_name_s' in rules) {
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state.name = rules.bat_name_s
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delete rules.bat_name_s
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if ('bat_player_count_s' in rules) {
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state.numplayers = parseInt(rules.bat_player_count_s)
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delete rules.bat_player_count_s
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}
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if ('bat_max_players_i' in rules) {
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state.maxplayers = parseInt(rules.bat_max_players_i)
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delete rules.bat_max_players_i
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}
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if ('bat_has_password_s' in rules) {
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state.password = rules.bat_has_password_s === 'Y'
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delete 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 rules.bat_map_s
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}
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}
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// Squad keeps its password in a separate field
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if (appId === AppId.Squad) {
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if (rules.Password_b === 'true') {
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state.password = true
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}
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}
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}
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async cleanup (/** Results */ state) {
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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 rawPlayers = [...state.raw.players]
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const sortedPlayers = rawPlayers.sort((a, b) => {
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return botProbability(a) - botProbability(b)
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})
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const numBots = state.raw.numbots || 0
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while (state.bots.length < numBots && sortedPlayers.length) {
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state.bots.push(sortedPlayers.pop())
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}
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while ((state.players.length < state.numplayers - numBots || sortedPlayers.length) && sortedPlayers.length) {
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state.players.push(sortedPlayers.pop())
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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.logger.debug(() => '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.logger.debug('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(4 +
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(type !== undefined ? 1 : 0) +
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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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if (type !== undefined) {
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b.writeUInt8(type, offset)
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offset += 1
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}
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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.logger.debug('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.logger.debug(() => 'Received partial packet uid: 0x' + uid.toString(16) + ' num: ' + packetNum)
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this.logger.debug(() => '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.logger.debug('BZIP DETECTED - Extracing packet...')
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try {
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assembled = Bzip2.decode(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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