mirror of
https://github.com/WorldEditAxe/eaglerproxy.git
synced 2024-11-08 06:56:03 -08:00
241 lines
10 KiB
TypeScript
241 lines
10 KiB
TypeScript
import { v3 } from "uuid"
|
|
import WebSocket from "ws"
|
|
import { ProxiedPlayer } from "./classes.js"
|
|
import {
|
|
encodeULEB128 as encodeVarInt,
|
|
decodeULEB128 as decodeVarInt,
|
|
encodeSLEB128 as encodeSVarInt,
|
|
decodeSLEB128 as decodeSVarInt
|
|
} from "@thi.ng/leb128"
|
|
import { DisconnectReason, EaglerPacketId, MAGIC_ENDING_IDENTIFYS_BYTES } from "./eaglerPacketDef.js"
|
|
import { Logger } from "./logger.js"
|
|
import { State } from "./types.js"
|
|
import { toBuffer } from "uuid-buffer"
|
|
import * as mc from "minecraft-protocol"
|
|
import { config } from "./config.js"
|
|
|
|
const MAGIC_UUID = "a7e774bc-7ea4-11ed-9a58-1f9e14304a59"
|
|
const logger = new Logger("LoginHandler")
|
|
const USERNAME_REGEX = /[^0-9^a-z^A-Z^_]/gi
|
|
|
|
export function genUUID(user: string): string {
|
|
return v3(user, MAGIC_UUID)
|
|
}
|
|
|
|
export function bufferizeUUID(uuid: string): Buffer {
|
|
return toBuffer(uuid)
|
|
}
|
|
|
|
export function validateUsername(user: string): void | never {
|
|
if (user.length > 20)
|
|
throw new Error("Username is too long!")
|
|
if (!!user.match(USERNAME_REGEX))
|
|
throw new Error("Invalid username. Username can only contain alphanumeric characters, and the underscore (_) character.")
|
|
}
|
|
|
|
export function disconnect(player: ProxiedPlayer, message: string, code?: DisconnectReason) {
|
|
if (player.state == State.POST_HANDSHAKE) {
|
|
const messageLen = encodeVarInt(message.length)
|
|
const d = Buffer.alloc(1 + messageLen.length + message.length)
|
|
d.set([0x40, ...messageLen, ...Buffer.from(message)])
|
|
player.ws.send(d)
|
|
player.ws.close()
|
|
} else {
|
|
const messageLen = encodeVarInt(message.length), codeEnc = encodeVarInt(code ?? DisconnectReason.CUSTOM)
|
|
const d = Buffer.alloc(1 + codeEnc.length + messageLen.length + message.length)
|
|
d.set([0xff,...codeEnc, ...messageLen, ...Buffer.from(message)])
|
|
player.ws.send(d)
|
|
player.ws.close()
|
|
}
|
|
}
|
|
|
|
export function awaitPacket(ws: WebSocket, id?: EaglerPacketId): Promise<Buffer> {
|
|
return new Promise<Buffer>((res, rej) => {
|
|
let resolved = false
|
|
const msgCb = (msg: any) => {
|
|
if (id != null && msg[0] == id) {
|
|
resolved = true
|
|
ws.removeEventListener('message', msgCb)
|
|
ws.removeEventListener('close', discon)
|
|
ws.setMaxListeners(ws.getMaxListeners() - 2 < 0 ? 5 : ws.getMaxListeners() - 2)
|
|
res(msg)
|
|
} else if (id == null) {
|
|
resolved = true
|
|
ws.removeEventListener('message', msgCb)
|
|
ws.removeEventListener('close', discon)
|
|
ws.setMaxListeners(ws.getMaxListeners() - 2 < 0 ? 5 : ws.getMaxListeners() - 2)
|
|
res(msg)
|
|
}
|
|
}
|
|
const discon = () => {
|
|
resolved = true
|
|
ws.removeEventListener('message', msgCb)
|
|
ws.removeEventListener('close', discon)
|
|
ws.setMaxListeners(ws.getMaxListeners() - 2 < 0 ? 5 : ws.getMaxListeners() - 2)
|
|
rej("Connection closed")
|
|
}
|
|
ws.setMaxListeners(ws.getMaxListeners() + 2)
|
|
ws.on('message', msgCb)
|
|
ws.on('close', discon)
|
|
setTimeout(() => {
|
|
ws.removeEventListener('message', msgCb)
|
|
ws.removeEventListener('close', discon)
|
|
ws.setMaxListeners(ws.getMaxListeners() - 2 < 0 ? 5 : ws.getMaxListeners() - 2)
|
|
rej("Timed out")
|
|
}, 10000)
|
|
})
|
|
}
|
|
|
|
export function loginServer(ip: string, port: number, client: ProxiedPlayer) {
|
|
return new Promise<void>((res, rej) => {
|
|
let receivedCompression = false
|
|
const mcClient = mc.createClient({
|
|
host: ip,
|
|
port: port,
|
|
auth: 'offline',
|
|
version: '1.8.8',
|
|
username: client.username
|
|
})
|
|
mcClient.on('error', err => {
|
|
mcClient.end()
|
|
rej(err)
|
|
})
|
|
mcClient.on('end', () => {
|
|
client.ws.close()
|
|
})
|
|
mcClient.on('connect', () => {
|
|
client.remoteConnection = mcClient
|
|
logger.info(`Player ${client.username} has been connected to the server.`)
|
|
res()
|
|
})
|
|
mcClient.on('raw', p => {
|
|
if (p[0] == 0x03 && !receivedCompression) {
|
|
receivedCompression = true
|
|
const compT = {
|
|
id: null,
|
|
thres: null
|
|
}
|
|
const id = decodeVarInt(p)
|
|
compT.id = Number(id[0])
|
|
const thres = decodeSVarInt(p.subarray(id[1]))
|
|
compT.thres = thres[0]
|
|
|
|
client.compressionThreshold = compT.thres
|
|
client.ws.send(p)
|
|
} else {
|
|
client.ws.send(p)
|
|
}
|
|
})
|
|
})
|
|
}
|
|
|
|
export async function doHandshake(client: ProxiedPlayer, initialPacket: Buffer) {
|
|
client.ws.on('close', () => {
|
|
client.state = State.DISCONNECTED
|
|
if (client.remoteConnection) {
|
|
client.remoteConnection.end()
|
|
}
|
|
PROXY.players.delete(client.username)
|
|
PROXY.playerStats.onlineCount -= 1
|
|
logger.info(`Client [/${client.ip}:${client.remotePort}]${client.username ? ` (${client.username})` : ""} disconnected from the server.`)
|
|
})
|
|
if (PROXY.players.size + 1 > PROXY.playerStats.max) {
|
|
disconnect(client, "The proxy is full!", DisconnectReason.CUSTOM)
|
|
return
|
|
}
|
|
const identifyC = {
|
|
id: null,
|
|
brandingLen: null,
|
|
branding: null,
|
|
verLen: null,
|
|
ver: null
|
|
}
|
|
if (true) {
|
|
// save namespace by nesting func declarations in a if true statement
|
|
const Iid = decodeVarInt(initialPacket)
|
|
identifyC.id = Number(Iid[0])
|
|
const brandingLen = decodeVarInt(initialPacket.subarray(Iid[1] + 2))
|
|
identifyC.brandingLen = Number(brandingLen[0])
|
|
identifyC.branding = initialPacket.subarray(brandingLen[1] + Iid[1] + 2, brandingLen[1] + Iid[1] + Number(brandingLen[0]) + 2).toString()
|
|
const verLen = decodeVarInt(initialPacket.subarray(brandingLen[1] + Iid[1] + Number(brandingLen[0]) + 2))
|
|
identifyC.verLen = Number(verLen[0])
|
|
identifyC.ver = initialPacket.subarray(brandingLen[1] + Number(brandingLen[0]) + Iid[1] + verLen[1] + 2).toString()
|
|
}
|
|
if (true) {
|
|
const brandingLen = encodeVarInt(PROXY.brand.length), brand = PROXY.brand
|
|
const verLen = encodeVarInt(PROXY.version.length), version = PROXY.version
|
|
const buff = Buffer.alloc(2 + MAGIC_ENDING_IDENTIFYS_BYTES.length + brandingLen.length + brand.length + verLen.length + version.length)
|
|
buff.set([EaglerPacketId.IDENTIFY_SERVER, 0x01, ...brandingLen, ...Buffer.from(brand), ...verLen, ...Buffer.from(version), ...Buffer.from(MAGIC_ENDING_IDENTIFYS_BYTES)])
|
|
client.ws.send(buff)
|
|
}
|
|
client.clientBrand = identifyC.branding
|
|
const login = await awaitPacket(client.ws)
|
|
const loginP = {
|
|
id: null,
|
|
usernameLen: null,
|
|
username: null,
|
|
randomStrLen: null,
|
|
randomStr: null,
|
|
nullByte: null
|
|
}
|
|
if (login[0] === EaglerPacketId.LOGIN) {
|
|
const Iid = decodeVarInt(login)
|
|
loginP.id = Number(Iid[0])
|
|
const usernameLen = decodeVarInt(login.subarray(loginP[1]))
|
|
loginP.usernameLen = Number(usernameLen[0])
|
|
loginP.username = login.subarray(Iid[1] + usernameLen[1], Iid[1] + usernameLen[1] + loginP.usernameLen).toString()
|
|
const randomStrLen = decodeVarInt(login.subarray(Iid[1] + usernameLen[1] + loginP.usernameLen))
|
|
loginP.randomStrLen = Number(randomStrLen[0])
|
|
loginP.randomStr = login.subarray(Iid[1] + usernameLen[1] + loginP.usernameLen + randomStrLen[1], Iid[1] + usernameLen[1] + loginP.usernameLen + randomStrLen[1] + loginP.randomStrLen).toString()
|
|
client.username = loginP.username
|
|
client.uuid = genUUID(client.username)
|
|
try { validateUsername(client.username) }
|
|
catch (err) {
|
|
disconnect(client, err.message, DisconnectReason.BAD_USERNAME)
|
|
return
|
|
}
|
|
if (PROXY.players.has(client.username)) {
|
|
disconnect(client, `Duplicate username: ${client.username}. Please connect under a different username.`, DisconnectReason.DUPLICATE_USERNAME)
|
|
return
|
|
}
|
|
PROXY.players.set(client.username, client)
|
|
if (true) {
|
|
const usernameLen = encodeVarInt(client.username.length), username = client.username
|
|
const uuidLen = encodeVarInt(client.uuid.length), uuid = client.uuid
|
|
const buff = Buffer.alloc(1 + usernameLen.length + username.length + uuidLen.length + uuid.length)
|
|
buff.set([EaglerPacketId.LOGIN_ACK, ...usernameLen, ...Buffer.from(username), ...uuidLen, ...Buffer.from(uuid)])
|
|
client.ws.send(buff)
|
|
|
|
if (true) {
|
|
const [skin, ready] = await Promise.all([awaitPacket(client.ws, EaglerPacketId.SKIN), awaitPacket(client.ws, EaglerPacketId.C_READY)])
|
|
if (ready[0] != 0x08) {
|
|
logger.error(`Client [/${client.ip}:${client.remotePort}] sent an unexpected packet! Disconnecting.`)
|
|
disconnect(client, "Received bad packet", DisconnectReason.UNEXPECTED_PACKET)
|
|
client.ws.close()
|
|
return
|
|
}
|
|
|
|
const buff = Buffer.alloc(1)
|
|
buff.set([EaglerPacketId.COMPLETE_HANDSHAKE])
|
|
client.ws.send(buff)
|
|
|
|
client.state = State.POST_HANDSHAKE
|
|
PROXY.playerStats.onlineCount += 1
|
|
|
|
logger.info(`Client [/${client.ip}:${client.remotePort}] authenticated as player "${client.username}" and passed handshake. Connecting!`)
|
|
try { await loginServer(config.server.host, config.server.port, client) }
|
|
catch (err) {
|
|
logger.error(`Could not connect to remote server at [/${config.server.host}:${config.server.port}]: ${err}`)
|
|
disconnect(client, "Failed to connect to server. Please try again later.", DisconnectReason.CUSTOM)
|
|
client.state = State.DISCONNECTED
|
|
client.ws.close()
|
|
return
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
logger.error(`Client [/${client.ip}:${client.remotePort}] sent an unexpected packet! Disconnecting.`)
|
|
disconnect(client, "Received bad packet", DisconnectReason.UNEXPECTED_PACKET)
|
|
client.ws.close()
|
|
}
|
|
} |