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| // https://raw.githubusercontent.com/zizifn/edgetunnel/main/src/worker-vless.js
// <!--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 ${udpSize}`);
if (isVlessHeaderSent) {
webSocket.send(
await new Blob([
udpSizeBuffer,
dnsQueryResult,
]).arrayBuffer(),
);
} else {
webSocket.send(
await new Blob([
vlessResponseHeader,
udpSizeBuffer,
dnsQueryResult,
]).arrayBuffer(),
);
isVlessHeaderSent = true;
}
}
},
}),
)
.catch((error) => {
log("dns udp has error" + error);
});
const writer = transformStream.writable.getWriter();
return {
/**
*
* @param {Uint8Array} chunk
*/
write(chunk) {
writer.write(chunk);
},
};
}
/**
*
* @param {string} userID
* @param {string | null} hostName
* @returns {string}
*/
function getVLESSConfig(userID, hostName) {
const vlessMain = `vless://${userID}\u0040${hostName}:443?encryption=none&security=tls&sni=${hostName}&fp=randomized&type=ws&host=${hostName}&path=%2F%3Fed%3D2048#${hostName}`;
return `
################################################################
v2ray
---------------------------------------------------------------
${vlessMain}
---------------------------------------------------------------
################################################################
clash-meta
---------------------------------------------------------------
- type: vless
name: ${hostName}
server: ${hostName}
port: 443
uuid: ${userID}
network: ws
tls: true
udp: false
sni: ${hostName}
client-fingerprint: chrome
ws-opts:
path: "/?ed=2048"
headers:
host: ${hostName}
---------------------------------------------------------------
################################################################
`;
}
|