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Add SplitHTTP Browser Dialer support (#3484)
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mmmray
GitHub
parent
308f0c64c3
commit
c8f6ba9ff0
11 changed files with 536 additions and 294 deletions
121
transport/internet/browser_dialer/dialer.go
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121
transport/internet/browser_dialer/dialer.go
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@ -0,0 +1,121 @@
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package browser_dialer
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import (
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"bytes"
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"context"
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_ "embed"
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"encoding/base64"
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"net/http"
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"time"
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"github.com/gorilla/websocket"
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"github.com/xtls/xray-core/common/errors"
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"github.com/xtls/xray-core/common/platform"
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"github.com/xtls/xray-core/common/uuid"
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)
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//go:embed dialer.html
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var webpage []byte
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var conns chan *websocket.Conn
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var upgrader = &websocket.Upgrader{
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ReadBufferSize: 0,
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WriteBufferSize: 0,
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HandshakeTimeout: time.Second * 4,
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CheckOrigin: func(r *http.Request) bool {
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return true
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},
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}
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func init() {
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addr := platform.NewEnvFlag(platform.BrowserDialerAddress).GetValue(func() string { return "" })
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if addr != "" {
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token := uuid.New()
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csrfToken := token.String()
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webpage = bytes.ReplaceAll(webpage, []byte("csrfToken"), []byte(csrfToken))
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conns = make(chan *websocket.Conn, 256)
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go http.ListenAndServe(addr, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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if r.URL.Path == "/websocket" {
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if r.URL.Query().Get("token") == csrfToken {
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if conn, err := upgrader.Upgrade(w, r, nil); err == nil {
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conns <- conn
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} else {
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errors.LogError(context.Background(), "Browser dialer http upgrade unexpected error")
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}
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}
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} else {
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w.Write(webpage)
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}
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}))
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}
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}
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func HasBrowserDialer() bool {
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return conns != nil
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}
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func DialWS(uri string, ed []byte) (*websocket.Conn, error) {
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data := []byte("WS " + uri)
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if ed != nil {
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data = append(data, " "+base64.RawURLEncoding.EncodeToString(ed)...)
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}
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return dialRaw(data)
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}
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func DialGet(uri string) (*websocket.Conn, error) {
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data := []byte("GET " + uri)
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return dialRaw(data)
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}
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func DialPost(uri string, payload []byte) error {
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data := []byte("POST " + uri)
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conn, err := dialRaw(data)
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if err != nil {
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return err
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}
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err = conn.WriteMessage(websocket.BinaryMessage, payload)
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if err != nil {
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return err
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}
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err = CheckOK(conn)
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if err != nil {
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return err
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}
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conn.Close()
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return nil
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}
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func dialRaw(data []byte) (*websocket.Conn, error) {
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var conn *websocket.Conn
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for {
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conn = <-conns
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if conn.WriteMessage(websocket.TextMessage, data) != nil {
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conn.Close()
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} else {
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break
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}
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}
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err := CheckOK(conn)
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if err != nil {
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return nil, err
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}
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return conn, nil
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}
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func CheckOK(conn *websocket.Conn) error {
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if _, p, err := conn.ReadMessage(); err != nil {
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conn.Close()
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return err
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} else if s := string(p); s != "ok" {
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conn.Close()
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return errors.New(s)
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}
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return nil
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}
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136
transport/internet/browser_dialer/dialer.html
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136
transport/internet/browser_dialer/dialer.html
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<!DOCTYPE html>
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<html>
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<head>
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<title>Browser Dialer</title>
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</head>
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<body>
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<script>
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// Copyright (c) 2021 XRAY. Mozilla Public License 2.0.
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var url = "ws://" + window.location.host + "/websocket?token=csrfToken";
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var clientIdleCount = 0;
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var upstreamGetCount = 0;
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var upstreamWsCount = 0;
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var upstreamPostCount = 0;
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setInterval(check, 1000);
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function check() {
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if (clientIdleCount > 0) {
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return;
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}
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clientIdleCount += 1;
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console.log("Prepare", url);
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var ws = new WebSocket(url);
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// arraybuffer is significantly faster in chrome than default
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// blob, tested with chrome 123
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ws.binaryType = "arraybuffer";
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ws.onmessage = function (event) {
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clientIdleCount -= 1;
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let [method, url, protocol] = event.data.split(" ");
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if (method == "WS") {
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upstreamWsCount += 1;
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console.log("Dial WS", url, protocol);
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const wss = new WebSocket(url, protocol);
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wss.binaryType = "arraybuffer";
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var opened = false;
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ws.onmessage = function (event) {
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wss.send(event.data)
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}
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wss.onopen = function (event) {
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opened = true;
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ws.send("ok")
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}
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wss.onmessage = function (event) {
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ws.send(event.data)
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}
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wss.onclose = function (event) {
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upstreamWsCount -= 1;
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console.log("Dial WS DONE, remaining: ", upstreamWsCount);
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ws.close()
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}
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wss.onerror = function (event) {
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!opened && ws.send("fail")
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wss.close()
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}
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ws.onclose = function (event) {
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wss.close()
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}
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} else if (method == "GET") {
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(async () => {
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console.log("Dial GET", url);
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ws.send("ok");
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const controller = new AbortController();
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/*
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Aborting a streaming response in JavaScript
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requires two levers to be pulled:
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First, the streaming read itself has to be cancelled using
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reader.cancel(), only then controller.abort() will actually work.
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If controller.abort() alone is called while a
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reader.read() is ongoing, it will block until the server closes the
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response, the page is refreshed or the network connection is lost.
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*/
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let reader = null;
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ws.onclose = (event) => {
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try {
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reader && reader.cancel();
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} catch(e) {}
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try {
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controller.abort();
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} catch(e) {}
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}
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try {
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upstreamGetCount += 1;
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const response = await fetch(url, {signal: controller.signal});
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const body = await response.body;
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reader = body.getReader();
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while (true) {
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const { done, value } = await reader.read();
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ws.send(value);
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if (done) break;
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}
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} finally {
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upstreamGetCount -= 1;
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console.log("Dial GET DONE, remaining: ", upstreamGetCount);
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ws.close();
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}
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})()
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} else if (method == "POST") {
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upstreamPostCount += 1;
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console.log("Dial POST", url);
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ws.send("ok");
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ws.onmessage = async (event) => {
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try {
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const response = await fetch(
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url,
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{method: "POST", body: event.data}
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);
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if (response.ok) {
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ws.send("ok");
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} else {
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console.error("bad status code");
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ws.send("fail");
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}
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} finally {
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upstreamPostCount -= 1;
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console.log("Dial POST DONE, remaining: ", upstreamPostCount);
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ws.close();
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}
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};
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}
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check()
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}
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ws.onerror = function (event) {
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ws.close()
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}
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}
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</script>
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</body>
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</html>
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