From 329b222e670d4f80f4d4061caa6590494e80fb23 Mon Sep 17 00:00:00 2001 From: utf-4096 Date: Thu, 23 Mar 2023 00:47:07 +0100 Subject: [PATCH] Initial commit --- .editorconfig | 9 + .gitignore | 2 + .gitmodules | 3 + index.js | 12 + package-lock.json | 932 ++++++++++++++++++++++++++++++++++++++++++++++ package.json | 30 ++ src/Peer.js | 117 ++++++ src/Protocol.js | 38 ++ src/Server.js | 72 ++++ src/protocol | 1 + 10 files changed, 1216 insertions(+) create mode 100644 .editorconfig create mode 100644 .gitignore create mode 100644 .gitmodules create mode 100644 index.js create mode 100644 package-lock.json create mode 100644 package.json create mode 100644 src/Peer.js create mode 100644 src/Protocol.js create mode 100644 src/Server.js create mode 160000 src/protocol diff --git a/.editorconfig b/.editorconfig new file mode 100644 index 0000000..74d81e5 --- /dev/null +++ b/.editorconfig @@ -0,0 +1,9 @@ +root = true + +[*.{js,json}] +indent_style = space +indent_size = 4 +end_of_line = lf +charset = utf-8 +trim_trailing_whitespace = true +insert_final_newline = true diff --git a/.gitignore b/.gitignore new file mode 100644 index 0000000..3ec544c --- /dev/null +++ b/.gitignore @@ -0,0 +1,2 @@ +node_modules/ +.env \ No newline at end of file diff --git a/.gitmodules b/.gitmodules new file mode 100644 index 0000000..8886395 --- /dev/null +++ b/.gitmodules @@ -0,0 +1,3 @@ +[submodule "src/protocol"] + path = src/protocol + url = git@git.sys36.net:windows-96/ppp2/protocol.git diff --git a/index.js b/index.js new file mode 100644 index 0000000..aa0e3ab --- /dev/null +++ b/index.js @@ -0,0 +1,12 @@ +import * as dotenv from 'dotenv' +dotenv.config() + +import { Server } from './src/Server.js' + +const { + PPP2_PORT, + PPP2_SALT +} = process.env + +const server = new Server({ salt: PPP2_SALT }) +server.listen(process.env.PPP2_PORT || 8090) diff --git a/package-lock.json b/package-lock.json new file mode 100644 index 0000000..e26a3fe --- /dev/null +++ b/package-lock.json @@ -0,0 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"utf-8-validate": "^6.0.3" + } +} diff --git a/src/Peer.js b/src/Peer.js new file mode 100644 index 0000000..eb707d4 --- /dev/null +++ b/src/Peer.js @@ -0,0 +1,117 @@ +import { + Container, + AuthenticationRequest, + AuthenticationResponse, + Message +} from './Protocol.js' + +import { EventEmitter } from 'node:events' +import { createHash } from 'node:crypto' + +export class Peer extends EventEmitter { + #id = 0 + #socket = null + #msgMap = null + #salt = null + #address = null + + constructor({ socket, salt }) { + super() + this.#socket = socket + this.#salt = salt + + this.#msgMap = new Map() + this.#msgMap.set('AuthenticationRequest', this.#onauth) + this.#msgMap.set('Message', this.#onmessage) + + this.#setupListeners() + } + + #setupListeners() { + this.#socket.on('message', data => { + let message + + try { + message = Container.decode(data) + } catch(err) { + console.error('(!) malformed message, disconnecting') + this.#socket.close() + return + } + + const container = Container.toObject(message, { + oneofs: true + }) + + const handler = this.#msgMap.get(container.message) + if(handler) { + handler.call(this, container) + } else { + console.error(`(!) unknown handler for ${container.message}`) + } + }) + + this.on('incoming', ({ source, message }) => { + this.#send({ + id: this.#id++, + message: Message.create({ + address: source.address.toString(10), + port: message.Message.port, + data: message.Message.data + }) + }) + }) + } + + #send({ id, message }) { + const container = Container.create({ + id, + [message.constructor.name]: message + }) + + const buf = Container.encode(container).finish() + console.log('sending:', buf) + this.#socket.send(buf) + } + + #onauth(message) { + const { seed } = AuthenticationRequest.toObject(message.AuthenticationRequest, { longs: String }) + if(this.#address !== null) { + this.#send({ + id: message.id, + message: AuthenticationResponse.create({ + status: 1, + address: this.#address + }) + }) + + return + } + + const hash = createHash('sha256').update(this.#salt + seed).digest('hex') + const address = BigInt('0x' + hash.substring(0, 16)) + console.log('assigned address', address.toString(16).match(/.{1,4}/g).join(':')) + this.#address = address + + console.log(address.toString(10)) + this.#send({ + id: message.id, + message: AuthenticationResponse.create({ + status: 0, + address: address.toString(10) + }) + }) + } + + #onmessage(message) { + const { address } = Message.toObject(message.Message, { longs: String }) + this.emit('outgoing', { + destination: BigInt(address), + message + }) + } + + get address() { + return this.#address + } +} diff --git a/src/Protocol.js b/src/Protocol.js new file mode 100644 index 0000000..76d53d6 --- /dev/null +++ b/src/Protocol.js @@ -0,0 +1,38 @@ +import protobuf from 'protobufjs' +import { resolve } from 'path' + +const import_proto = async (path, types) => { + const proto = await protobuf.load(`src/protocol/protobuf/${path}`) + return types.map(type => proto.lookupType(type)) +} + +export const [ + Container +] = await import_proto('2.0/Container.proto', ['Container']) + +export const [ + AuthenticationRequest, + AuthenticationResponse +] = await import_proto('2.0/Authentication.proto', ['AuthenticationRequest', 'AuthenticationResponse']) + +export const [ + Message +] = await import_proto('2.0/Message.proto', ['Message']) + +export const [ + PublishRequest, + PublishResponse, + DiscoverRequest, + DiscoverResponse +] = await import_proto('2.0/PublishDiscover.proto', ['PublishRequest', 'PublishResponse', 'DiscoverRequest', 'DiscoverResponse']) + +export const messages = [ + Container, + AuthenticationRequest, + AuthenticationResponse, + Message, + PublishRequest, + PublishResponse, + DiscoverRequest, + DiscoverResponse +] diff --git a/src/Server.js b/src/Server.js new file mode 100644 index 0000000..4769d9b --- /dev/null +++ b/src/Server.js @@ -0,0 +1,72 @@ +import { WebSocketServer } from 'ws' +import { randomBytes } from 'node:crypto' +import { Peer } from './Peer.js' + +const DEFAULT_OPTIONS = { + zlibDeflateOptions: { + chunkSize: 1024, + memLevel: 7, + level: 3 + }, + zlibInflateOptions: { + chunkSize: 10 * 1024 + }, + clientNoContextTakeover: true, + serverNoContextTakeover: true, + serverMaxWindowBits: 10, + concurrencyLimit: 10, + threshold: 1024 +} + +export class Server { + #salt = null + #wss = null + #options = Object.create(null) + #peers = [] + + constructor({ deflate = false, salt }) { + if(deflate) { + this.#options.perMessageDeflate = DEFAULT_OPTIONS + } + this.#salt = salt + } + + #randomizeAddress() { + let address + + while(!address || this.#peers.find(peer => peer.address.compare(address) === 0)) { + address = randomBytes(8) + } + + return address + } + + listen(port) { + const wss = new WebSocketServer({ + ...this.#options, + port, + }) + + wss.on('connection', socket => { + const peer = new Peer({ + salt: this.#salt, + socket + }) + + peer.on('outgoing', ({ destination, message }) => { + const destPeer = this.#peers.find(p => p.address === destination) + if(destPeer) { + destPeer.emit('incoming', { source: peer, message }) + } + }) + + this.#peers.push(peer) + + socket.on('close', () => { + this.#peers = this.#peers.filter(p => p !== peer) + }) + }) + + this.#wss = wss + } +} diff --git a/src/protocol b/src/protocol new file mode 160000 index 0000000..d0747fa --- /dev/null +++ b/src/protocol @@ -0,0 +1 @@ +Subproject commit d0747faf6860c825e81855e2b58cbc8298084af1