Initial commit

.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

.gitignore

@@ -0,0 +1,2 @@
+node_modules/
+.env

.gitmodules

@@ -0,0 +1,3 @@
+[submodule "src/protocol"]
+	path = src/protocol
+	url = git@git.sys36.net:windows-96/ppp2/protocol.git

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)

package-lock.json

@@ -0,0 +1,932 @@
+{
+  "name": "p3x-server",
+  "version": "1.0.0",
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+      "optional": true,
+      "requires": {
+        "node-gyp-build": "^4.3.0"
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+    "ws": {
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+      "resolved": "https://registry.npmjs.org/ws/-/ws-8.13.0.tgz",
+      "integrity": "sha512-x9vcZYTrFPC7aSIbj7sRCYo7L/Xb8Iy+pW0ng0wt2vCJv7M9HOMy0UoN3rr+IFC7hb7vXoqS+P9ktyLLLhO+LA==",
+      "requires": {}
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+  }
+}

package.json

@@ -0,0 +1,30 @@
+{
+  "type": "module",
+  "name": "p3x-server",
+  "version": "1.0.0",
+  "description": "",
+  "main": "index.js",
+  "scripts": {
+    "start": "NODE_VERSION=19 npm_config_prefix= $HOME/.nvm/nvm-exec .",
+    "dev": "NODE_VERSION=19 npm_config_prefix= $HOME/.nvm/nvm-exec ./node_modules/nodemon/bin/nodemon.js .",
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git@git.sys36.net:windows-96/online-services/p3-relay.git"
+  },
+  "author": "Windows96 Team",
+  "license": "UNLICENSED",
+  "dependencies": {
+    "dotenv": "^16.0.3",
+    "protobufjs": "^7.2.2",
+    "ws": "^8.13.0"
+  },
+  "devDependencies": {
+    "nodemon": "^2.0.21"
+  },
+  "optionalDependencies": {
+    "bufferutil": "^4.0.7",
+    "utf-8-validate": "^6.0.3"
+  }
+}

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
+    }
+}

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
+]

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
+    }
+}