mirror of
https://github.com/XTLS/Xray-core.git
synced 2024-08-24 13:46:25 +00:00
192 lines
4.6 KiB
Go
192 lines
4.6 KiB
Go
package websocket
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import (
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"context"
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_ "embed"
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"encoding/base64"
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"fmt"
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"io"
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"net/http"
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"os"
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"time"
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"github.com/xtls/xray-core/transport/internet/stat"
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"github.com/gorilla/websocket"
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"github.com/xtls/xray-core/common"
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"github.com/xtls/xray-core/common/net"
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"github.com/xtls/xray-core/common/session"
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"github.com/xtls/xray-core/transport/internet"
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"github.com/xtls/xray-core/transport/internet/tls"
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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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func init() {
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if addr := os.Getenv("XRAY_BROWSER_DIALER"); addr != "" {
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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 conn, err := upgrader.Upgrade(w, r, nil); err == nil {
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conns <- conn
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} else {
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fmt.Println("unexpected error")
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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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// Dial dials a WebSocket connection to the given destination.
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func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (stat.Connection, error) {
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newError("creating connection to ", dest).WriteToLog(session.ExportIDToError(ctx))
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var conn net.Conn
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if streamSettings.ProtocolSettings.(*Config).Ed > 0 {
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ctx, cancel := context.WithCancel(ctx)
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conn = &delayDialConn{
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dialed: make(chan bool, 1),
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cancel: cancel,
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ctx: ctx,
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dest: dest,
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streamSettings: streamSettings,
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}
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} else {
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var err error
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if conn, err = dialWebSocket(ctx, dest, streamSettings, nil); err != nil {
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return nil, newError("failed to dial WebSocket").Base(err)
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}
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}
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return stat.Connection(conn), nil
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}
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func init() {
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common.Must(internet.RegisterTransportDialer(protocolName, Dial))
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}
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func dialWebSocket(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig, ed []byte) (net.Conn, error) {
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wsSettings := streamSettings.ProtocolSettings.(*Config)
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dialer := &websocket.Dialer{
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NetDial: func(network, addr string) (net.Conn, error) {
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return internet.DialSystem(ctx, dest, streamSettings.SocketSettings)
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},
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ReadBufferSize: 4 * 1024,
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WriteBufferSize: 4 * 1024,
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HandshakeTimeout: time.Second * 8,
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}
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protocol := "ws"
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if config := tls.ConfigFromStreamSettings(streamSettings); config != nil {
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protocol = "wss"
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dialer.TLSClientConfig = config.GetTLSConfig(tls.WithDestination(dest), tls.WithNextProto("http/1.1"))
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}
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host := dest.NetAddr()
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if (protocol == "ws" && dest.Port == 80) || (protocol == "wss" && dest.Port == 443) {
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host = dest.Address.String()
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}
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uri := protocol + "://" + host + wsSettings.GetNormalizedPath()
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if conns != nil {
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data := []byte(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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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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if _, p, err := conn.ReadMessage(); err != nil {
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conn.Close()
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return nil, err
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} else if s := string(p); s != "ok" {
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conn.Close()
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return nil, newError(s)
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}
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return newConnection(conn, conn.RemoteAddr(), nil), nil
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}
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header := wsSettings.GetRequestHeader()
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if ed != nil {
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header.Set("Sec-WebSocket-Protocol", base64.StdEncoding.EncodeToString(ed))
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}
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conn, resp, err := dialer.Dial(uri, header)
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if err != nil {
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var reason string
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if resp != nil {
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reason = resp.Status
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}
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return nil, newError("failed to dial to (", uri, "): ", reason).Base(err)
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}
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return newConnection(conn, conn.RemoteAddr(), nil), nil
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}
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type delayDialConn struct {
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net.Conn
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closed bool
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dialed chan bool
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cancel context.CancelFunc
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ctx context.Context
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dest net.Destination
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streamSettings *internet.MemoryStreamConfig
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}
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func (d *delayDialConn) Write(b []byte) (int, error) {
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if d.closed {
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return 0, io.ErrClosedPipe
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}
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if d.Conn == nil {
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ed := b
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if len(ed) > int(d.streamSettings.ProtocolSettings.(*Config).Ed) {
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ed = nil
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}
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var err error
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if d.Conn, err = dialWebSocket(d.ctx, d.dest, d.streamSettings, ed); err != nil {
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d.Close()
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return 0, newError("failed to dial WebSocket").Base(err)
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}
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d.dialed <- true
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if ed != nil {
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return len(ed), nil
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}
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}
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return d.Conn.Write(b)
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}
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func (d *delayDialConn) Read(b []byte) (int, error) {
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if d.closed {
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return 0, io.ErrClosedPipe
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}
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if d.Conn == nil {
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select {
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case <-d.ctx.Done():
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return 0, io.ErrUnexpectedEOF
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case <-d.dialed:
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}
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}
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return d.Conn.Read(b)
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}
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func (d *delayDialConn) Close() error {
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d.closed = true
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d.cancel()
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if d.Conn == nil {
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return nil
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}
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return d.Conn.Close()
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}
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