Cloudflare Workers vless // <!--GAMFC-->version base on commit 841ed4e9ff121dde0ed6a56ae800c2e6c4f66056, time is 2024-04-16 18:02:37 UTC<!--GAMFC-END-->. // @ts-ignore import { connect } from 'cloudflare:sockets'; // How to generate your own UUID: // [Windows] Press "Win + R", input cmd and run: Powershell -NoExit -Command "[guid]::NewGuid()" let userID = 'd342d11e-d424-4583-b36e-524ab1f0afa4'; let proxyIP = ''; if (!isValidUUID(userID)) { throw new Error('uuid is not valid'); } export default { /** * @param {import("@cloudflare/workers-types").Request} request * @param {{UUID: string, PROXYIP: string}} env * @param {import("@cloudflare/workers-types").ExecutionContext} ctx * @returns {Promise<Response>} */ async fetch(request, env, ctx) { try { userID = env.UUID || userID; proxyIP = env.PROXYIP || proxyIP; const upgradeHeader = request.headers.get('Upgrade'); if (!upgradeHeader || upgradeHeader !== 'websocket') { const url = new URL(request.url); switch (url.pathname) { case '/': return new Response(JSON.stringify(request.cf), { status: 200 }); case `/${userID}`: { const vlessConfig = getVLESSConfig(userID, request.headers.get('Host')); return new Response(`${vlessConfig}`, { status: 200, headers: { "Content-Type": "text/plain;charset=utf-8", } }); } default: return new Response('Not found', { status: 404 }); } } else { return await vlessOverWSHandler(request); } } catch (err) { /** @type {Error} */ let e = err; return new Response(e.toString()); } }, }; /** * * @param {import("@cloudflare/workers-types").Request} request */ async function vlessOverWSHandler(request) { /** @type {import("@cloudflare/workers-types").WebSocket[]} */ // @ts-ignore const webSocketPair = new WebSocketPair(); const [client, webSocket] = Object.values(webSocketPair); webSocket.accept(); let address = ''; let portWithRandomLog = ''; const log = (/** @type {string} */ info, /** @type {string | undefined} */ event) => { console.log(`[${address}:${portWithRandomLog}] ${info}`, event || ''); }; const earlyDataHeader = request.headers.get('sec-websocket-protocol') || ''; const readableWebSocketStream = makeReadableWebSocketStream(webSocket, earlyDataHeader, log); /** @type {{ value: import("@cloudflare/workers-types").Socket | null}}*/ let remoteSocketWapper = { value: null, }; let udpStreamWrite = null; let isDns = false; // ws --> remote readableWebSocketStream.pipeTo(new WritableStream({ async write(chunk, controller) { if (isDns && udpStreamWrite) { return udpStreamWrite(chunk); } if (remoteSocketWapper.value) { const writer = remoteSocketWapper.value.writable.getWriter() await writer.write(chunk); writer.releaseLock(); return; } const { hasError, message, portRemote = 443, addressRemote = '', rawDataIndex, vlessVersion = new Uint8Array([0, 0]), isUDP, } = processVlessHeader(chunk, userID); address = addressRemote; portWithRandomLog = `${portRemote}--${Math.random()} ${isUDP ? 'udp ' : 'tcp ' } `; if (hasError) { // controller.error(message); throw new Error(message); // cf seems has bug, controller.error will not end stream // webSocket.close(1000, message); return; } // if UDP but port not DNS port, close it if (isUDP) { if (portRemote === 53) { isDns = true; } else { // controller.error('UDP proxy only enable for DNS which is port 53'); throw new Error('UDP proxy only enable for DNS which is port 53'); // cf seems has bug, controller.error will not end stream return; } } // ["version", "附加信息长度 N"] const vlessResponseHeader = new Uint8Array([vlessVersion[0], 0]); const rawClientData = chunk.slice(rawDataIndex); // TODO: support udp here when cf runtime has udp support if (isDns) { const { write } = await handleUDPOutBound(webSocket, vlessResponseHeader, log); udpStreamWrite = write; udpStreamWrite(rawClientData); return; } handleTCPOutBound(remoteSocketWapper, addressRemote, portRemote, rawClientData, webSocket, vlessResponseHeader, log); }, close() { log(`readableWebSocketStream is close`); }, abort(reason) { log(`readableWebSocketStream is abort`, JSON.stringify(reason)); }, })).catch((err) => { log('readableWebSocketStream pipeTo error', err); }); return new Response(null, { status: 101, // @ts-ignore webSocket: client, }); } /** * Handles outbound TCP connections. * * @param {any} remoteSocket * @param {string} addressRemote The remote address to connect to. * @param {number} portRemote The remote port to connect to. * @param {Uint8Array} rawClientData The raw client data to write. * @param {import("@cloudflare/workers-types").WebSocket} webSocket The WebSocket to pass the remote socket to. * @param {Uint8Array} vlessResponseHeader The VLESS response header. * @param {function} log The logging function. * @returns {Promise<void>} The remote socket. */ async function handleTCPOutBound(remoteSocket, addressRemote, portRemote, rawClientData, webSocket, vlessResponseHeader, log,) { async function connectAndWrite(address, port) { /** @type {import("@cloudflare/workers-types").Socket} */ const tcpSocket = connect({ hostname: address, port: port, }); remoteSocket.value = tcpSocket; log(`connected to ${address}:${port}`); const writer = tcpSocket.writable.getWriter(); await writer.write(rawClientData); // first write, nomal is tls client hello writer.releaseLock(); return tcpSocket; } // if the cf connect tcp socket have no incoming data, we retry to redirect ip async function retry() { const tcpSocket = await connectAndWrite(proxyIP || addressRemote, portRemote) // no matter retry success or not, close websocket tcpSocket.closed.catch(error => { console.log('retry tcpSocket closed error', error); }).finally(() => { safeCloseWebSocket(webSocket); }) remoteSocketToWS(tcpSocket, webSocket, vlessResponseHeader, null, log); } const tcpSocket = await connectAndWrite(addressRemote, portRemote); // when remoteSocket is ready, pass to websocket // remote--> ws remoteSocketToWS(tcpSocket, webSocket, vlessResponseHeader, retry, log); } /** * * @param {import("@cloudflare/workers-types").WebSocket} webSocketServer * @param {string} earlyDataHeader for ws 0rtt * @param {(info: string)=> void} log for ws 0rtt */ function makeReadableWebSocketStream(webSocketServer, earlyDataHeader, log) { let readableStreamCancel = false; const stream = new ReadableStream({ start(controller) { webSocketServer.addEventListener('message', (event) => { if (readableStreamCancel) { return; } const message = event.data; controller.enqueue(message); }); // The event means that the client closed the client -> server stream. // However, the server -> client stream is still open until you call close() on the server side. // The WebSocket protocol says that a separate close message must be sent in each direction to fully close the socket. webSocketServer.addEventListener('close', () => { // client send close, need close server // if stream is cancel, skip controller.close safeCloseWebSocket(webSocketServer); if (readableStreamCancel) { return; } controller.close(); } ); webSocketServer.addEventListener('error', (err) => { log('webSocketServer has error'); controller.error(err); } ); // for ws 0rtt const { earlyData, error } = base64ToArrayBuffer(earlyDataHeader); if (error) { controller.error(error); } else if (earlyData) { controller.enqueue(earlyData); } }, pull(controller) { // if ws can stop read if stream is full, we can implement backpressure // https://streams.spec.whatwg.org/#example-rs-push-backpressure }, cancel(reason) { // 1. pipe WritableStream has error, this cancel will called, so ws handle server close into here // 2. if readableStream is cancel, all controller.close/enqueue need skip, // 3. but from testing controller.error still work even if readableStream is cancel if (readableStreamCancel) { return; } log(`ReadableStream was canceled, due to ${reason}`) readableStreamCancel = true; safeCloseWebSocket(webSocketServer); } }); return stream; } // https://xtls.github.io/development/protocols/vless.html // https://github.com/zizifn/excalidraw-backup/blob/main/v2ray-protocol.excalidraw /** * * @param { ArrayBuffer} vlessBuffer * @param {string} userID * @returns */ function processVlessHeader( vlessBuffer, userID ) { if (vlessBuffer.byteLength < 24) { return { hasError: true, message: 'invalid data', }; } const version = new Uint8Array(vlessBuffer.slice(0, 1)); let isValidUser = false; let isUDP = false; if (stringify(new Uint8Array(vlessBuffer.slice(1, 17))) === userID) { isValidUser = true; } if (!isValidUser) { return { hasError: true, message: 'invalid user', }; } const optLength = new Uint8Array(vlessBuffer.slice(17, 18))[0]; //skip opt for now const command = new Uint8Array( vlessBuffer.slice(18 + optLength, 18 + optLength + 1) )[0]; // 0x01 TCP // 0x02 UDP // 0x03 MUX if (command === 1) { } else if (command === 2) { isUDP = true; } else { return { hasError: true, message: `command ${command} is not support, command 01-tcp,02-udp,03-mux`, }; } const portIndex = 18 + optLength + 1; const portBuffer = vlessBuffer.slice(portIndex, portIndex + 2); // port is big-Endian in raw data etc 80 == 0x005d const portRemote = new DataView(portBuffer).getUint16(0); let addressIndex = portIndex + 2; const addressBuffer = new Uint8Array( vlessBuffer.slice(addressIndex, addressIndex + 1) ); // 1--> ipv4 addressLength =4 // 2--> domain name addressLength=addressBuffer[1] // 3--> ipv6 addressLength =16 const addressType = addressBuffer[0]; let addressLength = 0; let addressValueIndex = addressIndex + 1; let addressValue = ''; switch (addressType) { case 1: addressLength = 4; addressValue = new Uint8Array( vlessBuffer.slice(addressValueIndex, addressValueIndex + addressLength) ).join('.'); break; case 2: addressLength = new Uint8Array( vlessBuffer.slice(addressValueIndex, addressValueIndex + 1) )[0]; addressValueIndex += 1; addressValue = new TextDecoder().decode( vlessBuffer.slice(addressValueIndex, addressValueIndex + addressLength) ); break; case 3: addressLength = 16; const dataView = new DataView( vlessBuffer.slice(addressValueIndex, addressValueIndex + addressLength) ); // 2001:0db8:85a3:0000:0000:8a2e:0370:7334 const ipv6 = []; for (let i = 0; i < 8; i++) { ipv6.push(dataView.getUint16(i * 2).toString(16)); } addressValue = ipv6.join(':'); // seems no need add [] for ipv6 break; default: return { hasError: true, message: `invild addressType is ${addressType}`, }; } if (!addressValue) { return { hasError: true, message: `addressValue is empty, addressType is ${addressType}`, }; } return { hasError: false, addressRemote: addressValue, addressType, portRemote, rawDataIndex: addressValueIndex + addressLength, vlessVersion: version, isUDP, }; } /** * * @param {import("@cloudflare/workers-types").Socket} remoteSocket * @param {import("@cloudflare/workers-types").WebSocket} webSocket * @param {ArrayBuffer} vlessResponseHeader * @param {(() => Promise<void>) | null} retry * @param {*} log */ async function remoteSocketToWS(remoteSocket, webSocket, vlessResponseHeader, retry, log) { // remote--> ws let remoteChunkCount = 0; let chunks = []; /** @type {ArrayBuffer | null} */ let vlessHeader = vlessResponseHeader; let hasIncomingData = false; // check if remoteSocket has incoming data await remoteSocket.readable .pipeTo( new WritableStream({ start() { }, /** * * @param {Uint8Array} chunk * @param {*} controller */ async write(chunk, controller) { hasIncomingData = true; // remoteChunkCount++; if (webSocket.readyState !== WS_READY_STATE_OPEN) { controller.error( 'webSocket.readyState is not open, maybe close' ); } if (vlessHeader) { webSocket.send(await new Blob([vlessHeader, chunk]).arrayBuffer()); vlessHeader = null; } else { // seems no need rate limit this, CF seems fix this??.. // if (remoteChunkCount > 20000) { // // cf one package is 4096 byte(4kb), 4096 * 20000 = 80M // await delay(1); // } webSocket.send(chunk); } }, close() { log(`remoteConnection!.readable is close with hasIncomingData is ${hasIncomingData}`); // safeCloseWebSocket(webSocket); // no need server close websocket frist for some case will casue HTTP ERR_CONTENT_LENGTH_MISMATCH issue, client will send close event anyway. }, abort(reason) { console.error(`remoteConnection!.readable abort`, reason); }, }) ) .catch((error) => { console.error( `remoteSocketToWS has exception `, error.stack || error ); safeCloseWebSocket(webSocket); }); // seems is cf connect socket have error, // 1. Socket.closed will have error // 2. Socket.readable will be close without any data coming if (hasIncomingData === false && retry) { log(`retry`) retry(); } } /** * * @param {string} base64Str * @returns */ function base64ToArrayBuffer(base64Str) { if (!base64Str) { return { error: null }; } try { // go use modified Base64 for URL rfc4648 which js atob not support base64Str = base64Str.replace(/-/g, '+').replace(/_/g, '/'); const decode = atob(base64Str); const arryBuffer = Uint8Array.from(decode, (c) => c.charCodeAt(0)); return { earlyData: arryBuffer.buffer, error: null }; } catch (error) { return { error }; } } /** * This is not real UUID validation * @param {string} uuid */ function isValidUUID(uuid) { const uuidRegex = /^[0-9a-f]{8}-[0-9a-f]{4}-[4][0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i; return uuidRegex.test(uuid); } const WS_READY_STATE_OPEN = 1; const WS_READY_STATE_CLOSING = 2; /** * Normally, WebSocket will not has exceptions when close. * @param {import("@cloudflare/workers-types").WebSocket} socket */ function safeCloseWebSocket(socket) { try { if (socket.readyState === WS_READY_STATE_OPEN || socket.readyState === WS_READY_STATE_CLOSING) { socket.close(); } } catch (error) { console.error('safeCloseWebSocket error', error); } } const byteToHex = []; for (let i = 0; i < 256; ++i) { byteToHex.push((i + 256).toString(16).slice(1)); } function unsafeStringify(arr, offset = 0) { return (byteToHex[arr[offset + 0]] + byteToHex[arr[offset + 1]] + byteToHex[arr[offset + 2]] + byteToHex[arr[offset + 3]] + "-" + byteToHex[arr[offset + 4]] + byteToHex[arr[offset + 5]] + "-" + byteToHex[arr[offset + 6]] + byteToHex[arr[offset + 7]] + "-" + byteToHex[arr[offset + 8]] + byteToHex[arr[offset + 9]] + "-" + byteToHex[arr[offset + 10]] + byteToHex[arr[offset + 11]] + byteToHex[arr[offset + 12]] + byteToHex[arr[offset + 13]] + byteToHex[arr[offset + 14]] + byteToHex[arr[offset + 15]]).toLowerCase(); } function stringify(arr, offset = 0) { const uuid = unsafeStringify(arr, offset); if (!isValidUUID(uuid)) { throw TypeError("Stringified UUID is invalid"); } return uuid; } /** * * @param {import("@cloudflare/workers-types").WebSocket} webSocket * @param {ArrayBuffer} vlessResponseHeader * @param {(string)=> void} log */ async function handleUDPOutBound(webSocket, vlessResponseHeader, log) { let isVlessHeaderSent = false; const transformStream = new TransformStream({ start(controller) { }, transform(chunk, controller) { // udp message 2 byte is the the length of udp data // TODO: this should have bug, beacsue maybe udp chunk can be in two websocket message for (let index = 0; index < chunk.byteLength;) { const lengthBuffer = chunk.slice(index, index + 2); const udpPakcetLength = new DataView(lengthBuffer).getUint16(0); const udpData = new Uint8Array( chunk.slice(index + 2, index + 2 + udpPakcetLength) ); index = index + 2 + udpPakcetLength; controller.enqueue(udpData); } }, flush(controller) { } }); // only handle dns udp for now transformStream.readable.pipeTo(new WritableStream({ async write(chunk) { const resp = await fetch('https://1.1.1.1/dns-query', { method: 'POST', headers: { 'content-type': 'application/dns-message', }, body: chunk, }) const dnsQueryResult = await resp.arrayBuffer(); const udpSize = dnsQueryResult.byteLength; // console.log([...new Uint8Array(dnsQueryResult)].map((x) => x.toString(16))); const udpSizeBuffer = new Uint8Array([(udpSize >> 8) & 0xff, udpSize & 0xff]); if (webSocket.readyState === WS_READY_STATE_OPEN) { log(`doh success and dns message length is ${udpSize}`); if (isVlessHeaderSent) { webSocket.send(await new Blob([udpSizeBuffer, dnsQueryResult]).arrayBuffer()); } else { webSocket.send(await new Blob([vlessResponseHeader, udpSizeBuffer, dnsQueryResult]).arrayBuffer()); isVlessHeaderSent = true; } } } })).catch((error) => { log('dns udp has error' + error) }); const writer = transformStream.writable.getWriter(); return { /** * * @param {Uint8Array} chunk */ write(chunk) { writer.write(chunk); } }; } /** * * @param {string} userID * @param {string | null} hostName * @returns {string} */ function getVLESSConfig(userID, hostName) { const vlessMain = `vle124ss://${userID}@${hostName}` return `${hostName}`; }

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