Add v2ray WebSocket transport

constant/v2ray.go

@@ -1,5 +1,6 @@
 package constant
 
 const (
-	V2RayTransportTypeGRPC = "grpc"
+	V2RayTransportTypeGRPC      = "grpc"
+	V2RayTransportTypeWebsocket = "ws"
 )

inbound/vmess.go

@@ -63,7 +63,7 @@ func NewVMess(ctx context.Context, router adapter.Router, logger log.ContextLogg
 		}
 	}
 	if options.Transport != nil {
-		inbound.transport, err = v2ray.NewServerTransport(ctx, common.PtrValueOrDefault(options.Transport), inbound.tlsConfig.Config(), adapter.NewUpstreamHandler(adapter.InboundContext{}, inbound.newTransportConnection, nil, nil))
+		inbound.transport, err = v2ray.NewServerTransport(ctx, common.PtrValueOrDefault(options.Transport), inbound.tlsConfig.Config(), adapter.NewUpstreamHandler(adapter.InboundContext{}, inbound.newTransportConnection, nil, nil), inbound)
 		if err != nil {
 			return nil, err
 		}

option/v2ray_transport.go

@@ -6,28 +6,31 @@ import (
 	E "github.com/sagernet/sing/common/exceptions"
 )
 
-type _V2RayInboundTransportOptions struct {
+type _V2RayTransportOptions struct {
-	Type        string           `json:"type,omitempty"`
+	Type             string                `json:"type,omitempty"`
-	GRPCOptions V2RayGRPCOptions `json:"-"`
+	GRPCOptions      V2RayGRPCOptions      `json:"-"`
+	WebsocketOptions V2RayWebsocketOptions `json:"-"`
 }
 
-type V2RayInboundTransportOptions _V2RayOutboundTransportOptions
+type V2RayTransportOptions _V2RayTransportOptions
 
-func (o V2RayInboundTransportOptions) MarshalJSON() ([]byte, error) {
+func (o V2RayTransportOptions) MarshalJSON() ([]byte, error) {
 	var v any
 	switch o.Type {
 	case "":
 		return nil, nil
 	case C.V2RayTransportTypeGRPC:
 		v = o.GRPCOptions
+	case C.V2RayTransportTypeWebsocket:
+		v = o.WebsocketOptions
 	default:
 		return nil, E.New("unknown transport type: " + o.Type)
 	}
-	return MarshallObjects((_V2RayOutboundTransportOptions)(o), v)
+	return MarshallObjects((_V2RayTransportOptions)(o), v)
 }
 
-func (o *V2RayInboundTransportOptions) UnmarshalJSON(bytes []byte) error {
+func (o *V2RayTransportOptions) UnmarshalJSON(bytes []byte) error {
-	err := json.Unmarshal(bytes, (*_V2RayOutboundTransportOptions)(o))
+	err := json.Unmarshal(bytes, (*_V2RayTransportOptions)(o))
 	if err != nil {
 		return err
 	}
@@ -38,16 +41,17 @@ func (o *V2RayInboundTransportOptions) UnmarshalJSON(bytes []byte) error {
 	default:
 		return E.New("unknown transport type: " + o.Type)
 	}
-	err = UnmarshallExcluded(bytes, (*_V2RayOutboundTransportOptions)(o), v)
+	err = UnmarshallExcluded(bytes, (*_V2RayTransportOptions)(o), v)
 	if err != nil {
 		return E.Cause(err, "vmess transport options")
 	}
 	return nil
 }
 
-type _V2RayOutboundTransportOptions struct {
+/*type _V2RayOutboundTransportOptions struct {
-	Type        string           `json:"type,omitempty"`
+	Type             string                `json:"type,omitempty"`
-	GRPCOptions V2RayGRPCOptions `json:"-"`
+	GRPCOptions      V2RayGRPCOptions      `json:"-"`
+	WebsocketOptions V2RayWebsocketOptions `json:"-"`
 }
 
 type V2RayOutboundTransportOptions _V2RayOutboundTransportOptions
@@ -59,6 +63,8 @@ func (o V2RayOutboundTransportOptions) MarshalJSON() ([]byte, error) {
 		return nil, nil
 	case C.V2RayTransportTypeGRPC:
 		v = o.GRPCOptions
+	case C.V2RayTransportTypeWebsocket:
+		v = o.WebsocketOptions
 	default:
 		return nil, E.New("unknown transport type: " + o.Type)
 	}
@@ -74,6 +80,8 @@ func (o *V2RayOutboundTransportOptions) UnmarshalJSON(bytes []byte) error {
 	switch o.Type {
 	case C.V2RayTransportTypeGRPC:
 		v = &o.GRPCOptions
+	case C.V2RayTransportTypeWebsocket:
+		v = &o.WebsocketOptions
 	default:
 		return E.New("unknown transport type: " + o.Type)
 	}
@@ -82,8 +90,15 @@ func (o *V2RayOutboundTransportOptions) UnmarshalJSON(bytes []byte) error {
 		return E.Cause(err, "vmess transport options")
 	}
 	return nil
-}
+}*/
 
 type V2RayGRPCOptions struct {
 	ServiceName string `json:"service_name,omitempty"`
 }
+
+type V2RayWebsocketOptions struct {
+	Path                string            `json:"path,omitempty"`
+	Headers             map[string]string `json:"headers,omitempty"`
+	MaxEarlyData        uint32            `json:"max_early_data,omitempty"`
+	EarlyDataHeaderName string            `json:"early_data_header_name,omitempty"`
+}

option/vmess.go

@@ -2,9 +2,9 @@ package option
 
 type VMessInboundOptions struct {
 	ListenOptions
-	Users     []VMessUser                   `json:"users,omitempty"`
+	Users     []VMessUser            `json:"users,omitempty"`
-	TLS       *InboundTLSOptions            `json:"tls,omitempty"`
+	TLS       *InboundTLSOptions     `json:"tls,omitempty"`
-	Transport *V2RayInboundTransportOptions `json:"transport,omitempty"`
+	Transport *V2RayTransportOptions `json:"transport,omitempty"`
 }
 
 type VMessUser struct {
@@ -16,13 +16,13 @@ type VMessUser struct {
 type VMessOutboundOptions struct {
 	OutboundDialerOptions
 	ServerOptions
-	UUID                string                         `json:"uuid"`
+	UUID                string                 `json:"uuid"`
-	Security            string                         `json:"security"`
+	Security            string                 `json:"security"`
-	AlterId             int                            `json:"alter_id,omitempty"`
+	AlterId             int                    `json:"alter_id,omitempty"`
-	GlobalPadding       bool                           `json:"global_padding,omitempty"`
+	GlobalPadding       bool                   `json:"global_padding,omitempty"`
-	AuthenticatedLength bool                           `json:"authenticated_length,omitempty"`
+	AuthenticatedLength bool                   `json:"authenticated_length,omitempty"`
-	Network             NetworkList                    `json:"network,omitempty"`
+	Network             NetworkList            `json:"network,omitempty"`
-	TLS                 *OutboundTLSOptions            `json:"tls,omitempty"`
+	TLS                 *OutboundTLSOptions    `json:"tls,omitempty"`
-	Multiplex           *MultiplexOptions              `json:"multiplex,omitempty"`
+	Multiplex           *MultiplexOptions      `json:"multiplex,omitempty"`
-	Transport           *V2RayOutboundTransportOptions `json:"transport,omitempty"`
+	Transport           *V2RayTransportOptions `json:"transport,omitempty"`
 }

test/vmess_transport_test.go

@@ -12,6 +12,40 @@ import (
 )
 
 func TestVMessGRPCSelf(t *testing.T) {
+	testVMessWebscoketSelf(t, &option.V2RayTransportOptions{
+		Type: C.V2RayTransportTypeGRPC,
+		GRPCOptions: option.V2RayGRPCOptions{
+			ServiceName: "TunService",
+		},
+	})
+}
+
+func TestVMessWebscoketSelf(t *testing.T) {
+	t.Run("basic", func(t *testing.T) {
+		testVMessWebscoketSelf(t, &option.V2RayTransportOptions{
+			Type: C.V2RayTransportTypeWebsocket,
+		})
+	})
+	t.Run("v2ray early data", func(t *testing.T) {
+		testVMessWebscoketSelf(t, &option.V2RayTransportOptions{
+			Type: C.V2RayTransportTypeWebsocket,
+			WebsocketOptions: option.V2RayWebsocketOptions{
+				MaxEarlyData: 2048,
+			},
+		})
+	})
+	t.Run("xray early data", func(t *testing.T) {
+		testVMessWebscoketSelf(t, &option.V2RayTransportOptions{
+			Type: C.V2RayTransportTypeWebsocket,
+			WebsocketOptions: option.V2RayWebsocketOptions{
+				MaxEarlyData:        2048,
+				EarlyDataHeaderName: "Sec-WebSocket-Protocol",
+			},
+		})
+	})
+}
+
+func testVMessWebscoketSelf(t *testing.T, transport *option.V2RayTransportOptions) {
 	user, err := uuid.DefaultGenerator.NewV4()
 	require.NoError(t, err)
 	_, certPem, keyPem := createSelfSignedCertificate(t, "example.org")
@@ -50,12 +84,7 @@ func TestVMessGRPCSelf(t *testing.T) {
 						CertificatePath: certPem,
 						KeyPath:         keyPem,
 					},
-					Transport: &option.V2RayInboundTransportOptions{
+					Transport: transport,
-						Type: C.V2RayTransportTypeGRPC,
-						GRPCOptions: option.V2RayGRPCOptions{
-							ServiceName: "TunService",
-						},
-					},
 				},
 			},
 		},
@@ -78,12 +107,7 @@ func TestVMessGRPCSelf(t *testing.T) {
 						ServerName:      "example.org",
 						CertificatePath: certPem,
 					},
-					Transport: &option.V2RayOutboundTransportOptions{
+					Transport: transport,
-						Type: C.V2RayTransportTypeGRPC,
-						GRPCOptions: option.V2RayGRPCOptions{
-							ServiceName: "TunService",
-						},
-					},
 				},
 			},
 		},

transport/v2ray/grpc.go

@@ -7,15 +7,16 @@ import (
 	"crypto/tls"
 
 	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing-box/transport/v2raygrpc"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
 )
 
-func NewGRPCServer(ctx context.Context, serviceName string, tlsConfig *tls.Config, handler N.TCPConnectionHandler) (adapter.V2RayServerTransport, error) {
+func NewGRPCServer(ctx context.Context, options option.V2RayGRPCOptions, tlsConfig *tls.Config, handler N.TCPConnectionHandler) (adapter.V2RayServerTransport, error) {
-	return v2raygrpc.NewServer(ctx, serviceName, tlsConfig, handler), nil
+	return v2raygrpc.NewServer(ctx, options, tlsConfig, handler), nil
 }
 
-func NewGRPCClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, serviceName string, tlsConfig *tls.Config) (adapter.V2RayClientTransport, error) {
+func NewGRPCClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, options option.V2RayGRPCOptions, tlsConfig *tls.Config) (adapter.V2RayClientTransport, error) {
-	return v2raygrpc.NewClient(ctx, dialer, serverAddr, serviceName, tlsConfig), nil
+	return v2raygrpc.NewClient(ctx, dialer, serverAddr, options, tlsConfig), nil
 }

transport/v2ray/grpc_stub.go

@@ -7,6 +7,7 @@ import (
 	"crypto/tls"
 
 	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/option"
 	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
@@ -14,10 +15,10 @@ import (
 
 var errGRPCNotIncluded = E.New("gRPC is not included in this build, rebuild with -tags with_grpc")
 
-func NewGRPCServer(ctx context.Context, serviceName string, tlsConfig *tls.Config, handler N.TCPConnectionHandler) (adapter.V2RayServerTransport, error) {
+func NewGRPCServer(ctx context.Context, options option.V2RayGRPCOptions, tlsConfig *tls.Config, handler N.TCPConnectionHandler) (adapter.V2RayServerTransport, error) {
 	return nil, errGRPCNotIncluded
 }
 
-func NewGRPCClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, serviceName string, tlsConfig *tls.Config) (adapter.V2RayClientTransport, error) {
+func NewGRPCClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, options option.V2RayGRPCOptions, tlsConfig *tls.Config) (adapter.V2RayClientTransport, error) {
 	return nil, errGRPCNotIncluded
 }

transport/v2ray/transport.go

@@ -7,30 +7,35 @@ import (
 	"github.com/sagernet/sing-box/adapter"
 	C "github.com/sagernet/sing-box/constant"
 	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing-box/transport/v2raywebsocket"
 	E "github.com/sagernet/sing/common/exceptions"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
 )
 
-func NewServerTransport(ctx context.Context, options option.V2RayInboundTransportOptions, tlsConfig *tls.Config, handler N.TCPConnectionHandler) (adapter.V2RayServerTransport, error) {
+func NewServerTransport(ctx context.Context, options option.V2RayTransportOptions, tlsConfig *tls.Config, handler N.TCPConnectionHandler, errorHandler E.Handler) (adapter.V2RayServerTransport, error) {
 	if options.Type == "" {
 		return nil, nil
 	}
 	switch options.Type {
 	case C.V2RayTransportTypeGRPC:
-		return NewGRPCServer(ctx, options.GRPCOptions.ServiceName, tlsConfig, handler)
+		return NewGRPCServer(ctx, options.GRPCOptions, tlsConfig, handler)
+	case C.V2RayTransportTypeWebsocket:
+		return v2raywebsocket.NewServer(ctx, options.WebsocketOptions, tlsConfig, handler, errorHandler), nil
 	default:
 		return nil, E.New("unknown transport type: " + options.Type)
 	}
 }
 
-func NewClientTransport(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, options option.V2RayOutboundTransportOptions, tlsConfig *tls.Config) (adapter.V2RayClientTransport, error) {
+func NewClientTransport(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, options option.V2RayTransportOptions, tlsConfig *tls.Config) (adapter.V2RayClientTransport, error) {
 	if options.Type == "" {
 		return nil, nil
 	}
 	switch options.Type {
 	case C.V2RayTransportTypeGRPC:
-		return NewGRPCClient(ctx, dialer, serverAddr, options.GRPCOptions.ServiceName, tlsConfig)
+		return NewGRPCClient(ctx, dialer, serverAddr, options.GRPCOptions, tlsConfig)
+	case C.V2RayTransportTypeWebsocket:
+		return v2raywebsocket.NewClient(ctx, dialer, serverAddr, options.WebsocketOptions, tlsConfig), nil
 	default:
 		return nil, E.New("unknown transport type: " + options.Type)
 	}

transport/v2raygrpc/client.go

@@ -8,6 +8,7 @@ import (
 	"time"
 
 	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/option"
 	"github.com/sagernet/sing/common"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
@@ -31,7 +32,7 @@ type Client struct {
 	connAccess  sync.Mutex
 }
 
-func NewClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, serviceName string, tlsConfig *tls.Config) adapter.V2RayClientTransport {
+func NewClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, options option.V2RayGRPCOptions, tlsConfig *tls.Config) adapter.V2RayClientTransport {
 	var dialOptions []grpc.DialOption
 	if tlsConfig != nil {
 		dialOptions = append(dialOptions, grpc.WithTransportCredentials(credentials.NewTLS(tlsConfig)))
@@ -55,7 +56,7 @@ func NewClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, ser
 		ctx:         ctx,
 		dialer:      dialer,
 		serverAddr:  serverAddr.String(),
-		serviceName: serviceName,
+		serviceName: options.ServiceName,
 		dialOptions: dialOptions,
 	}
 }

transport/v2raygrpc/server.go

@@ -6,6 +6,7 @@ import (
 	"net"
 
 	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/option"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
 
@@ -21,14 +22,14 @@ type Server struct {
 	server  *grpc.Server
 }
 
-func NewServer(ctx context.Context, serviceName string, tlsConfig *tls.Config, handler N.TCPConnectionHandler) *Server {
+func NewServer(ctx context.Context, options option.V2RayGRPCOptions, tlsConfig *tls.Config, handler N.TCPConnectionHandler) *Server {
 	var serverOptions []grpc.ServerOption
 	if tlsConfig != nil {
 		tlsConfig.NextProtos = []string{"h2"}
 		serverOptions = append(serverOptions, grpc.Creds(credentials.NewTLS(tlsConfig)))
 	}
 	server := &Server{ctx, handler, grpc.NewServer(serverOptions...)}
-	RegisterGunServiceCustomNameServer(server.server, server, serviceName)
+	RegisterGunServiceCustomNameServer(server.server, server, options.ServiceName)
 	return server
 }
 

transport/v2raywebsocket/client.go

@@ -0,0 +1,82 @@
+package v2raywebsocket
+
+import (
+	"context"
+	"crypto/tls"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/sagernet/sing-box/adapter"
+	"github.com/sagernet/sing-box/option"
+	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+
+	"github.com/gorilla/websocket"
+)
+
+var _ adapter.V2RayClientTransport = (*Client)(nil)
+
+type Client struct {
+	dialer              *websocket.Dialer
+	uri                 string
+	headers             http.Header
+	maxEarlyData        uint32
+	earlyDataHeaderName string
+}
+
+func NewClient(ctx context.Context, dialer N.Dialer, serverAddr M.Socksaddr, options option.V2RayWebsocketOptions, tlsConfig *tls.Config) adapter.V2RayClientTransport {
+	wsDialer := &websocket.Dialer{
+		NetDialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+			return dialer.DialContext(ctx, network, M.ParseSocksaddr(addr))
+		},
+		TLSClientConfig:  tlsConfig,
+		ReadBufferSize:   4 * 1024,
+		WriteBufferSize:  4 * 1024,
+		HandshakeTimeout: time.Second * 8,
+	}
+	var uri url.URL
+	if tlsConfig == nil {
+		uri.Scheme = "ws"
+	} else {
+		uri.Scheme = "wss"
+	}
+	uri.Host = serverAddr.String()
+	uri.Path = options.Path
+	if !strings.HasPrefix(uri.Path, "/") {
+		uri.Path = "/" + uri.Path
+	}
+	headers := make(http.Header)
+	for key, value := range options.Headers {
+		headers.Set(key, value)
+	}
+	return &Client{
+		wsDialer,
+		uri.String(),
+		headers,
+		options.MaxEarlyData,
+		options.EarlyDataHeaderName,
+	}
+}
+
+func (c *Client) DialContext(ctx context.Context) (net.Conn, error) {
+	if c.maxEarlyData <= 0 {
+		conn, response, err := c.dialer.DialContext(ctx, c.uri, c.headers)
+		if err == nil {
+			return &WebsocketConn{Conn: conn}, nil
+		}
+		return nil, wrapDialError(response, err)
+	} else {
+		return &EarlyWebsocketConn{Client: c, create: make(chan struct{})}, nil
+	}
+}
+
+func wrapDialError(response *http.Response, err error) error {
+	if response == nil {
+		return err
+	}
+	return E.Extend(err, "HTTP ", response.StatusCode, " ", response.Status)
+}

transport/v2raywebsocket/conn.go

@@ -0,0 +1,153 @@
+package v2raywebsocket
+
+import (
+	"encoding/base64"
+	"io"
+	"net"
+	"net/http"
+	"os"
+	"time"
+
+	E "github.com/sagernet/sing/common/exceptions"
+
+	"github.com/gorilla/websocket"
+)
+
+type WebsocketConn struct {
+	*websocket.Conn
+	remoteAddr net.Addr
+	reader     io.Reader
+}
+
+func (c *WebsocketConn) Read(b []byte) (n int, err error) {
+	for {
+		if c.reader == nil {
+			_, c.reader, err = c.NextReader()
+			if err != nil {
+				return
+			}
+		}
+		n, err = c.reader.Read(b)
+		if E.IsMulti(err, io.EOF) {
+			c.reader = nil
+			continue
+		}
+		return
+	}
+}
+
+func (c *WebsocketConn) Write(b []byte) (n int, err error) {
+	err = c.WriteMessage(websocket.BinaryMessage, b)
+	if err != nil {
+		return
+	}
+	return len(b), nil
+}
+
+func (c *WebsocketConn) RemoteAddr() net.Addr {
+	if c.remoteAddr != nil {
+		return c.remoteAddr
+	}
+	return c.Conn.RemoteAddr()
+}
+
+func (c *WebsocketConn) SetDeadline(t time.Time) error {
+	return os.ErrInvalid
+}
+
+type EarlyWebsocketConn struct {
+	*Client
+	conn   *WebsocketConn
+	create chan struct{}
+}
+
+func (c *EarlyWebsocketConn) Read(b []byte) (n int, err error) {
+	if c.conn == nil {
+		<-c.create
+	}
+	return c.conn.Read(b)
+}
+
+func (c *EarlyWebsocketConn) Write(b []byte) (n int, err error) {
+	if c.conn != nil {
+		return c.conn.Write(b)
+	}
+	var (
+		earlyData []byte
+		lateData  []byte
+		conn      *websocket.Conn
+		response  *http.Response
+	)
+	if len(earlyData) > int(c.maxEarlyData) {
+		earlyData = earlyData[:c.maxEarlyData]
+		lateData = lateData[c.maxEarlyData:]
+	} else {
+		earlyData = b
+	}
+	if len(earlyData) > 0 {
+		earlyDataString := base64.RawURLEncoding.EncodeToString(earlyData)
+		if c.earlyDataHeaderName == "" {
+			conn, response, err = c.dialer.Dial(c.uri+earlyDataString, c.headers)
+		} else {
+			headers := c.headers.Clone()
+			headers.Set(c.earlyDataHeaderName, earlyDataString)
+			conn, response, err = c.dialer.Dial(c.uri, headers)
+		}
+	} else {
+		conn, response, err = c.dialer.Dial(c.uri, c.headers)
+	}
+	if err != nil {
+		return 0, wrapDialError(response, err)
+	}
+	c.conn = &WebsocketConn{Conn: conn}
+	close(c.create)
+	if len(lateData) > 0 {
+		_, err = c.conn.Write(lateData)
+	}
+	if err != nil {
+		return
+	}
+	return len(b), nil
+}
+
+func (c *EarlyWebsocketConn) Close() error {
+	if c.conn == nil {
+		return nil
+	}
+	return c.conn.Close()
+}
+
+func (c *EarlyWebsocketConn) LocalAddr() net.Addr {
+	if c.conn == nil {
+		return nil
+	}
+	return c.conn.LocalAddr()
+}
+
+func (c *EarlyWebsocketConn) RemoteAddr() net.Addr {
+	if c.conn == nil {
+		return nil
+	}
+	return c.conn.RemoteAddr()
+}
+
+func (c *EarlyWebsocketConn) SetDeadline(t time.Time) error {
+	if c.conn == nil {
+		return os.ErrInvalid
+	}
+	return c.conn.SetDeadline(t)
+}
+
+func (c *EarlyWebsocketConn) SetReadDeadline(t time.Time) error {
+	if c.conn == nil {
+		return os.ErrInvalid
+	}
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *EarlyWebsocketConn) SetWriteDeadline(t time.Time) error {
+	if c.conn == nil {
+		return os.ErrInvalid
+	}
+	return c.conn.SetWriteDeadline(t)
+}

transport/v2raywebsocket/server.go

@@ -0,0 +1,138 @@
+package v2raywebsocket
+
+import (
+	"context"
+	"crypto/tls"
+	"encoding/base64"
+	"net"
+	"net/http"
+	"net/netip"
+	"strings"
+
+	"github.com/sagernet/sing-box/adapter"
+	C "github.com/sagernet/sing-box/constant"
+	"github.com/sagernet/sing-box/option"
+	"github.com/sagernet/sing/common"
+	"github.com/sagernet/sing/common/buf"
+	"github.com/sagernet/sing/common/bufio"
+	E "github.com/sagernet/sing/common/exceptions"
+	M "github.com/sagernet/sing/common/metadata"
+	N "github.com/sagernet/sing/common/network"
+
+	"github.com/gorilla/websocket"
+)
+
+var _ adapter.V2RayServerTransport = (*Server)(nil)
+
+type Server struct {
+	ctx                 context.Context
+	handler             N.TCPConnectionHandler
+	errorHandler        E.Handler
+	httpServer          *http.Server
+	path                string
+	maxEarlyData        uint32
+	earlyDataHeaderName string
+}
+
+func NewServer(ctx context.Context, options option.V2RayWebsocketOptions, tlsConfig *tls.Config, handler N.TCPConnectionHandler, errorHandler E.Handler) *Server {
+	server := &Server{
+		ctx:                 ctx,
+		handler:             handler,
+		errorHandler:        errorHandler,
+		path:                options.Path,
+		maxEarlyData:        options.MaxEarlyData,
+		earlyDataHeaderName: options.EarlyDataHeaderName,
+	}
+	if !strings.HasPrefix(server.path, "/") {
+		server.path = "/" + server.path
+	}
+	server.httpServer = &http.Server{
+		Handler:           server,
+		ReadHeaderTimeout: C.TCPTimeout,
+		MaxHeaderBytes:    http.DefaultMaxHeaderBytes,
+		TLSConfig:         tlsConfig,
+	}
+	return server
+}
+
+var upgrader = websocket.Upgrader{
+	HandshakeTimeout: C.TCPTimeout,
+	CheckOrigin: func(r *http.Request) bool {
+		return true
+	},
+}
+
+func (s *Server) ServeHTTP(writer http.ResponseWriter, request *http.Request) {
+	if s.maxEarlyData == 0 || s.earlyDataHeaderName != "" {
+		if request.URL.Path != s.path {
+			writer.WriteHeader(http.StatusNotFound)
+			s.badRequest(request, E.New("bad path: ", request.URL.Path))
+			return
+		}
+	}
+	var (
+		earlyData []byte
+		err       error
+		conn      net.Conn
+	)
+	if s.earlyDataHeaderName == "" {
+		if strings.HasPrefix(request.URL.RequestURI(), s.path) {
+			earlyDataStr := request.URL.RequestURI()[len(s.path):]
+			earlyData, err = base64.RawURLEncoding.DecodeString(earlyDataStr)
+		} else {
+			writer.WriteHeader(http.StatusNotFound)
+			s.badRequest(request, E.New("bad path: ", request.URL.Path))
+			return
+		}
+	} else {
+		earlyDataStr := request.Header.Get(s.earlyDataHeaderName)
+		if earlyDataStr != "" {
+			earlyData, err = base64.RawURLEncoding.DecodeString(earlyDataStr)
+		}
+	}
+	if err != nil {
+		writer.WriteHeader(http.StatusBadRequest)
+		s.badRequest(request, E.Cause(err, "decode early data"))
+		return
+	}
+	wsConn, err := upgrader.Upgrade(writer, request, nil)
+	if err != nil {
+		s.badRequest(request, E.Cause(err, "upgrade websocket connection"))
+		return
+	}
+	var remoteAddr net.Addr
+	forwardFrom := request.Header.Get("X-Forwarded-For")
+	if forwardFrom != "" {
+		for _, from := range strings.Split(forwardFrom, ",") {
+			originAddr, err := netip.ParseAddr(from)
+			if err == nil {
+				remoteAddr = M.SocksaddrFrom(originAddr, 0).TCPAddr()
+				break
+			}
+		}
+	}
+	conn = &WebsocketConn{
+		Conn:       wsConn,
+		remoteAddr: remoteAddr,
+	}
+	if len(earlyData) > 0 {
+		conn = bufio.NewCachedConn(conn, buf.As(earlyData))
+	}
+	s.handler.NewConnection(request.Context(), conn, M.Metadata{})
+}
+
+func (s *Server) badRequest(request *http.Request, err error) {
+	s.errorHandler.NewError(request.Context(), E.Cause(err, "process connection from ", request.RemoteAddr))
+}
+
+func (s *Server) Serve(listener net.Listener) error {
+	if s.httpServer.TLSConfig == nil {
+		return s.httpServer.Serve(listener)
+	} else {
+		return s.httpServer.ServeTLS(listener, "", "")
+	}
+}
+
+func (s *Server) Close() error {
+	return common.Close(s.httpServer)
+}