From 0b5391447ed783d5b8d26ec509f476b6091801ef Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E4=B8=96=E7=95=8C?= <i@sekai.icu>
Date: Sat, 29 Aug 2026 15:59:41 +0800
Subject: [PATCH] Fix websocket early data with smux and yamux multiplex

---
 transport/v2raywebsocket/client.go | 21 ++++++---------
 transport/v2raywebsocket/conn.go   | 42 ++++++++++++++----------------
 2 files changed, 28 insertions(+), 35 deletions(-)

diff --git a/transport/v2raywebsocket/client.go b/transport/v2raywebsocket/client.go
index a071e8d1..7a5bb252 100644
--- a/transport/v2raywebsocket/client.go
+++ b/transport/v2raywebsocket/client.go
@@ -73,11 +73,18 @@ func NewClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, opt
 	}, nil
 }
 
-func (c *Client) dialContext(ctx context.Context, requestURL *url.URL, headers http.Header) (*WebsocketConn, error) {
+func (c *Client) DialContext(ctx context.Context) (net.Conn, error) {
 	conn, err := c.dialer.DialContext(ctx, N.NetworkTCP, c.serverAddr)
 	if err != nil {
 		return nil, err
 	}
+	if c.maxEarlyData > 0 {
+		return &EarlyWebsocketConn{Client: c, rawConn: conn, create: make(chan struct{})}, nil
+	}
+	return c.upgrade(conn, &c.requestURL, c.headers)
+}
+
+func (c *Client) upgrade(conn net.Conn, requestURL *url.URL, headers http.Header) (*WebsocketConn, error) {
 	var deadlineConn net.Conn
 	if deadline.NeedAdditionalReadDeadline(conn) {
 		deadlineConn = deadline.NewConn(conn)
@@ -108,18 +115,6 @@ func (c *Client) dialContext(ctx context.Context, requestURL *url.URL, headers h
 	return NewConn(conn, nil, ws.StateClientSide), nil
 }
 
-func (c *Client) DialContext(ctx context.Context) (net.Conn, error) {
-	if c.maxEarlyData <= 0 {
-		conn, err := c.dialContext(ctx, &c.requestURL, c.headers)
-		if err != nil {
-			return nil, err
-		}
-		return conn, nil
-	} else {
-		return &EarlyWebsocketConn{Client: c, ctx: ctx, create: make(chan struct{})}, nil
-	}
-}
-
 func (c *Client) Close() error {
 	return nil
 }
diff --git a/transport/v2raywebsocket/conn.go b/transport/v2raywebsocket/conn.go
index 4939e737..ef277233 100644
--- a/transport/v2raywebsocket/conn.go
+++ b/transport/v2raywebsocket/conn.go
@@ -1,7 +1,6 @@
 package v2raywebsocket
 
 import (
-	"context"
 	"encoding/base64"
 	"errors"
 	"io"
@@ -16,7 +15,6 @@ import (
 	"github.com/sagernet/sing/common/buf"
 	"github.com/sagernet/sing/common/debug"
 	E "github.com/sagernet/sing/common/exceptions"
-	M "github.com/sagernet/sing/common/metadata"
 	"github.com/sagernet/ws"
 	"github.com/sagernet/ws/wsutil"
 )
@@ -135,11 +133,11 @@ func (c *WebsocketConn) Upstream() any {
 
 type EarlyWebsocketConn struct {
 	*Client
-	ctx    context.Context
-	conn   atomic.Pointer[WebsocketConn]
-	access sync.Mutex
-	create chan struct{}
-	err    error
+	rawConn net.Conn
+	conn    atomic.Pointer[WebsocketConn]
+	access  sync.Mutex
+	create  chan struct{}
+	err     error
 }
 
 func (c *EarlyWebsocketConn) Read(b []byte) (n int, err error) {
@@ -172,14 +170,14 @@ func (c *EarlyWebsocketConn) writeRequest(content []byte) error {
 		if c.earlyDataHeaderName == "" {
 			requestURL := c.requestURL
 			requestURL.Path += earlyDataString
-			conn, err = c.dialContext(c.ctx, &requestURL, c.headers)
+			conn, err = c.upgrade(c.rawConn, &requestURL, c.headers)
 		} else {
 			headers := c.headers.Clone()
 			headers.Set(c.earlyDataHeaderName, earlyDataString)
-			conn, err = c.dialContext(c.ctx, &c.requestURL, headers)
+			conn, err = c.upgrade(c.rawConn, &c.requestURL, headers)
 		}
 	} else {
-		conn, err = c.dialContext(c.ctx, &c.requestURL, c.headers)
+		conn, err = c.upgrade(c.rawConn, &c.requestURL, c.headers)
 	}
 	if err != nil {
 		return err
@@ -240,26 +238,26 @@ func (c *EarlyWebsocketConn) WriteBuffer(buffer *buf.Buffer) error {
 
 func (c *EarlyWebsocketConn) Close() error {
 	conn := c.conn.Load()
-	if conn == nil {
+	if conn != nil {
+		return conn.Close()
+	}
+	c.rawConn.Close()
+	c.access.Lock()
+	defer c.access.Unlock()
+	if c.conn.Load() != nil || c.err != nil {
 		return nil
 	}
-	return conn.Close()
+	c.err = net.ErrClosed
+	close(c.create)
+	return nil
 }
 
 func (c *EarlyWebsocketConn) LocalAddr() net.Addr {
-	conn := c.conn.Load()
-	if conn == nil {
-		return M.Socksaddr{}
-	}
-	return conn.LocalAddr()
+	return c.rawConn.LocalAddr()
 }
 
 func (c *EarlyWebsocketConn) RemoteAddr() net.Addr {
-	conn := c.conn.Load()
-	if conn == nil {
-		return M.Socksaddr{}
-	}
-	return conn.RemoteAddr()
+	return c.rawConn.RemoteAddr()
 }
 
 func (c *EarlyWebsocketConn) SetDeadline(t time.Time) error {