mirror of
https://github.com/WorldEditAxe/eaglerproxy.git
synced 2024-09-19 08:56:00 -07:00
241 lines
10 KiB
TypeScript
241 lines
10 KiB
TypeScript
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import { v3 } from "uuid"
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import WebSocket from "ws"
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import { ProxiedPlayer } from "./classes.js"
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import {
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encodeULEB128 as encodeVarInt,
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decodeULEB128 as decodeVarInt,
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encodeSLEB128 as encodeSVarInt,
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decodeSLEB128 as decodeSVarInt
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} from "@thi.ng/leb128"
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import { DisconnectReason, EaglerPacketId, MAGIC_ENDING_IDENTIFYS_BYTES } from "./eaglerPacketDef.js"
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import { Logger } from "./logger.js"
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import { State } from "./types.js"
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import { toBuffer } from "uuid-buffer"
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import * as mc from "minecraft-protocol"
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import { config } from "./config.js"
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const MAGIC_UUID = "a7e774bc-7ea4-11ed-9a58-1f9e14304a59"
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const logger = new Logger("LoginHandler")
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const USERNAME_REGEX = /[^0-9^a-z^A-Z^_]/gi
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export function genUUID(user: string): string {
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return v3(user, MAGIC_UUID)
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}
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export function bufferizeUUID(uuid: string): Buffer {
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return toBuffer(uuid)
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}
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export function validateUsername(user: string): void | never {
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if (user.length > 20)
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throw new Error("Username is too long!")
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if (!!user.match(USERNAME_REGEX))
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throw new Error("Invalid username. Username can only contain alphanumeric characters, and the underscore (_) character.")
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}
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export function disconnect(player: ProxiedPlayer, message: string, code?: DisconnectReason) {
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if (player.state == State.POST_HANDSHAKE) {
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const messageLen = encodeVarInt(message.length)
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const d = Buffer.alloc(1 + messageLen.length + message.length)
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d.set([0x40, ...messageLen, ...Buffer.from(message)])
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player.ws.send(d)
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player.ws.close()
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} else {
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const messageLen = encodeVarInt(message.length), codeEnc = encodeVarInt(code ?? DisconnectReason.CUSTOM)
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const d = Buffer.alloc(1 + codeEnc.length + messageLen.length + message.length)
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d.set([0xff,...codeEnc, ...messageLen, ...Buffer.from(message)])
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player.ws.send(d)
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player.ws.close()
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}
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}
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export function awaitPacket(ws: WebSocket, id?: EaglerPacketId): Promise<Buffer> {
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return new Promise<Buffer>((res, rej) => {
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let resolved = false
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const msgCb = (msg: any) => {
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if (id != null && msg[0] == id) {
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resolved = true
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ws.removeEventListener('message', msgCb)
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ws.removeEventListener('close', discon)
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ws.setMaxListeners(ws.getMaxListeners() - 2 < 0 ? 5 : ws.getMaxListeners() - 2)
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res(msg)
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} else if (id == null) {
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resolved = true
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ws.removeEventListener('message', msgCb)
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ws.removeEventListener('close', discon)
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ws.setMaxListeners(ws.getMaxListeners() - 2 < 0 ? 5 : ws.getMaxListeners() - 2)
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res(msg)
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}
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}
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const discon = () => {
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resolved = true
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ws.removeEventListener('message', msgCb)
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ws.removeEventListener('close', discon)
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ws.setMaxListeners(ws.getMaxListeners() - 2 < 0 ? 5 : ws.getMaxListeners() - 2)
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rej("Connection closed")
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}
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ws.setMaxListeners(ws.getMaxListeners() + 2)
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ws.on('message', msgCb)
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ws.on('close', discon)
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setTimeout(() => {
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ws.removeEventListener('message', msgCb)
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ws.removeEventListener('close', discon)
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ws.setMaxListeners(ws.getMaxListeners() - 2 < 0 ? 5 : ws.getMaxListeners() - 2)
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rej("Timed out")
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}, 10000)
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})
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}
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export function loginServer(ip: string, port: number, client: ProxiedPlayer) {
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return new Promise<void>((res, rej) => {
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let receivedCompression = false
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const mcClient = mc.createClient({
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host: ip,
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port: port,
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auth: 'offline',
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version: '1.8.8',
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username: client.username
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})
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mcClient.on('error', err => {
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mcClient.end()
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rej(err)
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})
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mcClient.on('end', () => {
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client.ws.close()
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})
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mcClient.on('connect', () => {
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client.remoteConnection = mcClient
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logger.info(`Player ${client.username} has been connected to the server.`)
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res()
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})
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mcClient.on('raw', p => {
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if (p[0] == 0x03 && !receivedCompression) {
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receivedCompression = true
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const compT = {
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id: null,
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thres: null
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}
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const id = decodeVarInt(p)
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compT.id = Number(id[0])
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const thres = decodeSVarInt(p.subarray(id[1]))
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compT.thres = thres[0]
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client.compressionThreshold = compT.thres
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client.ws.send(p)
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} else {
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client.ws.send(p)
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}
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})
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})
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}
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export async function doHandshake(client: ProxiedPlayer, initialPacket: Buffer) {
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client.ws.on('close', () => {
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client.state = State.DISCONNECTED
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if (client.remoteConnection) {
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client.remoteConnection.end()
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}
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PROXY.players.delete(client.username)
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PROXY.playerStats.onlineCount -= 1
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logger.info(`Client [/${client.ip}:${client.remotePort}]${client.username ? ` (${client.username})` : ""} disconnected from the server.`)
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})
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if (PROXY.players.size + 1 > PROXY.playerStats.max) {
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disconnect(client, "The proxy is full!", DisconnectReason.CUSTOM)
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return
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}
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const identifyC = {
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id: null,
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brandingLen: null,
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branding: null,
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verLen: null,
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ver: null
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}
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if (true) {
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// save namespace by nesting func declarations in a if true statement
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const Iid = decodeVarInt(initialPacket)
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identifyC.id = Number(Iid[0])
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const brandingLen = decodeVarInt(initialPacket.subarray(Iid[1] + 2))
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identifyC.brandingLen = Number(brandingLen[0])
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identifyC.branding = initialPacket.subarray(brandingLen[1] + Iid[1] + 2, brandingLen[1] + Iid[1] + Number(brandingLen[0]) + 2).toString()
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const verLen = decodeVarInt(initialPacket.subarray(brandingLen[1] + Iid[1] + Number(brandingLen[0]) + 2))
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identifyC.verLen = Number(verLen[0])
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identifyC.ver = initialPacket.subarray(brandingLen[1] + Number(brandingLen[0]) + Iid[1] + verLen[1] + 2).toString()
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}
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if (true) {
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const brandingLen = encodeVarInt(PROXY.brand.length), brand = PROXY.brand
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const verLen = encodeVarInt(PROXY.version.length), version = PROXY.version
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const buff = Buffer.alloc(2 + MAGIC_ENDING_IDENTIFYS_BYTES.length + brandingLen.length + brand.length + verLen.length + version.length)
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buff.set([EaglerPacketId.IDENTIFY_SERVER, 0x01, ...brandingLen, ...Buffer.from(brand), ...verLen, ...Buffer.from(version), ...Buffer.from(MAGIC_ENDING_IDENTIFYS_BYTES)])
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client.ws.send(buff)
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}
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client.clientBrand = identifyC.branding
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const login = await awaitPacket(client.ws)
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const loginP = {
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id: null,
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usernameLen: null,
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username: null,
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randomStrLen: null,
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randomStr: null,
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nullByte: null
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}
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if (login[0] === EaglerPacketId.LOGIN) {
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const Iid = decodeVarInt(login)
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loginP.id = Number(Iid[0])
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const usernameLen = decodeVarInt(login.subarray(loginP[1]))
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loginP.usernameLen = Number(usernameLen[0])
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loginP.username = login.subarray(Iid[1] + usernameLen[1], Iid[1] + usernameLen[1] + loginP.usernameLen).toString()
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const randomStrLen = decodeVarInt(login.subarray(Iid[1] + usernameLen[1] + loginP.usernameLen))
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loginP.randomStrLen = Number(randomStrLen[0])
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loginP.randomStr = login.subarray(Iid[1] + usernameLen[1] + loginP.usernameLen + randomStrLen[1], Iid[1] + usernameLen[1] + loginP.usernameLen + randomStrLen[1] + loginP.randomStrLen).toString()
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client.username = loginP.username
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client.uuid = genUUID(client.username)
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try { validateUsername(client.username) }
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catch (err) {
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disconnect(client, err.message, DisconnectReason.BAD_USERNAME)
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return
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}
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if (PROXY.players.has(client.username)) {
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disconnect(client, `Duplicate username: ${client.username}. Please connect under a different username.`, DisconnectReason.DUPLICATE_USERNAME)
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return
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}
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PROXY.players.set(client.username, client)
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if (true) {
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const usernameLen = encodeVarInt(client.username.length), username = client.username
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const uuidLen = encodeVarInt(client.uuid.length), uuid = client.uuid
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const buff = Buffer.alloc(1 + usernameLen.length + username.length + uuidLen.length + uuid.length)
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buff.set([EaglerPacketId.LOGIN_ACK, ...usernameLen, ...Buffer.from(username), ...uuidLen, ...Buffer.from(uuid)])
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client.ws.send(buff)
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if (true) {
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const [skin, ready] = await Promise.all([awaitPacket(client.ws, EaglerPacketId.SKIN), awaitPacket(client.ws, EaglerPacketId.C_READY)])
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if (ready[0] != 0x08) {
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logger.error(`Client [/${client.ip}:${client.remotePort}] sent an unexpected packet! Disconnecting.`)
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disconnect(client, "Received bad packet", DisconnectReason.UNEXPECTED_PACKET)
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client.ws.close()
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return
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}
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const buff = Buffer.alloc(1)
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buff.set([EaglerPacketId.COMPLETE_HANDSHAKE])
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client.ws.send(buff)
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client.state = State.POST_HANDSHAKE
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PROXY.playerStats.onlineCount += 1
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logger.info(`Client [/${client.ip}:${client.remotePort}] authenticated as player "${client.username}" and passed handshake. Connecting!`)
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try { await loginServer(config.server.host, config.server.port, client) }
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catch (err) {
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logger.error(`Could not connect to remote server at [/${config.server.host}:${config.server.port}]: ${err}`)
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disconnect(client, "Failed to connect to server. Please try again later.", DisconnectReason.CUSTOM)
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client.state = State.DISCONNECTED
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client.ws.close()
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return
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}
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}
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}
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} else {
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logger.error(`Client [/${client.ip}:${client.remotePort}] sent an unexpected packet! Disconnecting.`)
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disconnect(client, "Received bad packet", DisconnectReason.UNEXPECTED_PACKET)
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client.ws.close()
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}
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}
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