Fix udp

app/dispatcher/default.go

@@ -30,10 +30,15 @@ var errSniffingTimeout = newError("timeout on sniffing")
 
 type cachedReader struct {
 	sync.Mutex
-	reader *pipe.Reader
+	reader timeoutReader
 	cache  buf.MultiBuffer
 }
 
+type timeoutReader interface {
+	buf.Reader
+	buf.TimeoutReader
+}
+
 func (r *cachedReader) Cache(b *buf.Buffer) {
 	mb, _ := r.reader.ReadMultiBufferTimeout(time.Millisecond * 100)
 	r.Lock()
@@ -84,7 +89,7 @@ func (r *cachedReader) Interrupt() {
 		r.cache = buf.ReleaseMulti(r.cache)
 	}
 	r.Unlock()
-	r.reader.Interrupt()
+	common.Interrupt(r.reader)
 }
 
 // DefaultDispatcher is a default implementation of Dispatcher.
@@ -345,7 +350,7 @@ func (d *DefaultDispatcher) DispatchLink(ctx context.Context, destination net.De
 		d.routedDispatch(ctx, outbound, destination)
 	} else {
 		cReader := &cachedReader{
-			reader: outbound.Reader.(*pipe.Reader),
+			reader: outbound.Reader.(timeoutReader),
 		}
 		outbound.Reader = cReader
 		result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly, destination.Network)

app/proxyman/config.pb.go

@@ -524,6 +524,7 @@ type SenderConfig struct {
 	StreamSettings    *internet.StreamConfig `protobuf:"bytes,2,opt,name=stream_settings,json=streamSettings,proto3" json:"stream_settings,omitempty"`
 	ProxySettings     *internet.ProxyConfig  `protobuf:"bytes,3,opt,name=proxy_settings,json=proxySettings,proto3" json:"proxy_settings,omitempty"`
 	MultiplexSettings *MultiplexingConfig    `protobuf:"bytes,4,opt,name=multiplex_settings,json=multiplexSettings,proto3" json:"multiplex_settings,omitempty"`
+	SmuxSettings      *SingMultiplexConfig   `protobuf:"bytes,5,opt,name=smux_settings,json=smuxSettings,proto3" json:"smux_settings,omitempty"`
 }
 
 func (x *SenderConfig) Reset() {
@@ -586,6 +587,13 @@ func (x *SenderConfig) GetMultiplexSettings() *MultiplexingConfig {
 	return nil
 }
 
+func (x *SenderConfig) GetSmuxSettings() *SingMultiplexConfig {
+	if x != nil {
+		return x.SmuxSettings
+	}
+	return nil
+}
+
 type MultiplexingConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -661,6 +669,93 @@ func (x *MultiplexingConfig) GetXudpProxyUDP443() string {
 	return ""
 }
 
+type SingMultiplexConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Enabled        bool   `protobuf:"varint,1,opt,name=enabled,proto3" json:"enabled,omitempty"`
+	Protocol       string `protobuf:"bytes,2,opt,name=protocol,proto3" json:"protocol,omitempty"`
+	MaxConnections int32  `protobuf:"varint,3,opt,name=max_connections,json=maxConnections,proto3" json:"max_connections,omitempty"`
+	MinStreams     int32  `protobuf:"varint,4,opt,name=min_streams,json=minStreams,proto3" json:"min_streams,omitempty"`
+	MaxStreams     int32  `protobuf:"varint,5,opt,name=max_streams,json=maxStreams,proto3" json:"max_streams,omitempty"`
+	Padding        bool   `protobuf:"varint,6,opt,name=padding,proto3" json:"padding,omitempty"`
+}
+
+func (x *SingMultiplexConfig) Reset() {
+	*x = SingMultiplexConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_proxyman_config_proto_msgTypes[8]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *SingMultiplexConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*SingMultiplexConfig) ProtoMessage() {}
+
+func (x *SingMultiplexConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_app_proxyman_config_proto_msgTypes[8]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use SingMultiplexConfig.ProtoReflect.Descriptor instead.
+func (*SingMultiplexConfig) Descriptor() ([]byte, []int) {
+	return file_app_proxyman_config_proto_rawDescGZIP(), []int{8}
+}
+
+func (x *SingMultiplexConfig) GetEnabled() bool {
+	if x != nil {
+		return x.Enabled
+	}
+	return false
+}
+
+func (x *SingMultiplexConfig) GetProtocol() string {
+	if x != nil {
+		return x.Protocol
+	}
+	return ""
+}
+
+func (x *SingMultiplexConfig) GetMaxConnections() int32 {
+	if x != nil {
+		return x.MaxConnections
+	}
+	return 0
+}
+
+func (x *SingMultiplexConfig) GetMinStreams() int32 {
+	if x != nil {
+		return x.MinStreams
+	}
+	return 0
+}
+
+func (x *SingMultiplexConfig) GetMaxStreams() int32 {
+	if x != nil {
+		return x.MaxStreams
+	}
+	return 0
+}
+
+func (x *SingMultiplexConfig) GetPadding() bool {
+	if x != nil {
+		return x.Padding
+	}
+	return false
+}
+
 type AllocationStrategy_AllocationStrategyConcurrency struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -672,7 +767,7 @@ type AllocationStrategy_AllocationStrategyConcurrency struct {
 func (x *AllocationStrategy_AllocationStrategyConcurrency) Reset() {
 	*x = AllocationStrategy_AllocationStrategyConcurrency{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_proxyman_config_proto_msgTypes[8]
+		mi := &file_app_proxyman_config_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -685,7 +780,7 @@ func (x *AllocationStrategy_AllocationStrategyConcurrency) String() string {
 func (*AllocationStrategy_AllocationStrategyConcurrency) ProtoMessage() {}
 
 func (x *AllocationStrategy_AllocationStrategyConcurrency) ProtoReflect() protoreflect.Message {
-	mi := &file_app_proxyman_config_proto_msgTypes[8]
+	mi := &file_app_proxyman_config_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -719,7 +814,7 @@ type AllocationStrategy_AllocationStrategyRefresh struct {
 func (x *AllocationStrategy_AllocationStrategyRefresh) Reset() {
 	*x = AllocationStrategy_AllocationStrategyRefresh{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_proxyman_config_proto_msgTypes[9]
+		mi := &file_app_proxyman_config_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -732,7 +827,7 @@ func (x *AllocationStrategy_AllocationStrategyRefresh) String() string {
 func (*AllocationStrategy_AllocationStrategyRefresh) ProtoMessage() {}
 
 func (x *AllocationStrategy_AllocationStrategyRefresh) ProtoReflect() protoreflect.Message {
-	mi := &file_app_proxyman_config_proto_msgTypes[9]
+	mi := &file_app_proxyman_config_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -855,7 +950,7 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
 	0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x73, 0x65, 0x72, 0x69, 0x61, 0x6c, 0x2e, 0x54, 0x79, 0x70, 0x65,
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@@ -874,18 +969,36 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
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@@ -909,7 +1022,7 @@ func file_app_proxyman_config_proto_rawDescGZIP() []byte {
 }
 
 var file_app_proxyman_config_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_app_proxyman_config_proto_msgTypes = make([]protoimpl.MessageInfo, 10)
+var file_app_proxyman_config_proto_msgTypes = make([]protoimpl.MessageInfo, 11)
 var file_app_proxyman_config_proto_goTypes = []interface{}{
 	(KnownProtocols)(0),                                      // 0: xray.app.proxyman.KnownProtocols
 	(AllocationStrategy_Type)(0),                             // 1: xray.app.proxyman.AllocationStrategy.Type
@@ -921,35 +1034,37 @@ var file_app_proxyman_config_proto_goTypes = []interface{}{
 	(*OutboundConfig)(nil),                                   // 7: xray.app.proxyman.OutboundConfig
 	(*SenderConfig)(nil),                                     // 8: xray.app.proxyman.SenderConfig
 	(*MultiplexingConfig)(nil),                               // 9: xray.app.proxyman.MultiplexingConfig
-	(*AllocationStrategy_AllocationStrategyConcurrency)(nil), // 10: xray.app.proxyman.AllocationStrategy.AllocationStrategyConcurrency
-	(*AllocationStrategy_AllocationStrategyRefresh)(nil),     // 11: xray.app.proxyman.AllocationStrategy.AllocationStrategyRefresh
-	(*net.PortList)(nil),                                     // 12: xray.common.net.PortList
-	(*net.IPOrDomain)(nil),                                   // 13: xray.common.net.IPOrDomain
-	(*internet.StreamConfig)(nil),                            // 14: xray.transport.internet.StreamConfig
-	(*serial.TypedMessage)(nil),                              // 15: xray.common.serial.TypedMessage
-	(*internet.ProxyConfig)(nil),                             // 16: xray.transport.internet.ProxyConfig
+	(*SingMultiplexConfig)(nil),                              // 10: xray.app.proxyman.SingMultiplexConfig
+	(*AllocationStrategy_AllocationStrategyConcurrency)(nil), // 11: xray.app.proxyman.AllocationStrategy.AllocationStrategyConcurrency
+	(*AllocationStrategy_AllocationStrategyRefresh)(nil),     // 12: xray.app.proxyman.AllocationStrategy.AllocationStrategyRefresh
+	(*net.PortList)(nil),                                     // 13: xray.common.net.PortList
+	(*net.IPOrDomain)(nil),                                   // 14: xray.common.net.IPOrDomain
+	(*internet.StreamConfig)(nil),                            // 15: xray.transport.internet.StreamConfig
+	(*serial.TypedMessage)(nil),                              // 16: xray.common.serial.TypedMessage
+	(*internet.ProxyConfig)(nil),                             // 17: xray.transport.internet.ProxyConfig
 }
 var file_app_proxyman_config_proto_depIdxs = []int32{
 	1,  // 0: xray.app.proxyman.AllocationStrategy.type:type_name -> xray.app.proxyman.AllocationStrategy.Type
-	10, // 1: xray.app.proxyman.AllocationStrategy.concurrency:type_name -> xray.app.proxyman.AllocationStrategy.AllocationStrategyConcurrency
-	11, // 2: xray.app.proxyman.AllocationStrategy.refresh:type_name -> xray.app.proxyman.AllocationStrategy.AllocationStrategyRefresh
-	12, // 3: xray.app.proxyman.ReceiverConfig.port_list:type_name -> xray.common.net.PortList
-	13, // 4: xray.app.proxyman.ReceiverConfig.listen:type_name -> xray.common.net.IPOrDomain
+	11, // 1: xray.app.proxyman.AllocationStrategy.concurrency:type_name -> xray.app.proxyman.AllocationStrategy.AllocationStrategyConcurrency
+	12, // 2: xray.app.proxyman.AllocationStrategy.refresh:type_name -> xray.app.proxyman.AllocationStrategy.AllocationStrategyRefresh
+	13, // 3: xray.app.proxyman.ReceiverConfig.port_list:type_name -> xray.common.net.PortList
+	14, // 4: xray.app.proxyman.ReceiverConfig.listen:type_name -> xray.common.net.IPOrDomain
 	3,  // 5: xray.app.proxyman.ReceiverConfig.allocation_strategy:type_name -> xray.app.proxyman.AllocationStrategy
-	14, // 6: xray.app.proxyman.ReceiverConfig.stream_settings:type_name -> xray.transport.internet.StreamConfig
+	15, // 6: xray.app.proxyman.ReceiverConfig.stream_settings:type_name -> xray.transport.internet.StreamConfig
 	0,  // 7: xray.app.proxyman.ReceiverConfig.domain_override:type_name -> xray.app.proxyman.KnownProtocols
 	4,  // 8: xray.app.proxyman.ReceiverConfig.sniffing_settings:type_name -> xray.app.proxyman.SniffingConfig
-	15, // 9: xray.app.proxyman.InboundHandlerConfig.receiver_settings:type_name -> xray.common.serial.TypedMessage
-	15, // 10: xray.app.proxyman.InboundHandlerConfig.proxy_settings:type_name -> xray.common.serial.TypedMessage
-	13, // 11: xray.app.proxyman.SenderConfig.via:type_name -> xray.common.net.IPOrDomain
-	14, // 12: xray.app.proxyman.SenderConfig.stream_settings:type_name -> xray.transport.internet.StreamConfig
-	16, // 13: xray.app.proxyman.SenderConfig.proxy_settings:type_name -> xray.transport.internet.ProxyConfig
+	16, // 9: xray.app.proxyman.InboundHandlerConfig.receiver_settings:type_name -> xray.common.serial.TypedMessage
+	16, // 10: xray.app.proxyman.InboundHandlerConfig.proxy_settings:type_name -> xray.common.serial.TypedMessage
+	14, // 11: xray.app.proxyman.SenderConfig.via:type_name -> xray.common.net.IPOrDomain
+	15, // 12: xray.app.proxyman.SenderConfig.stream_settings:type_name -> xray.transport.internet.StreamConfig
+	17, // 13: xray.app.proxyman.SenderConfig.proxy_settings:type_name -> xray.transport.internet.ProxyConfig
 	9,  // 14: xray.app.proxyman.SenderConfig.multiplex_settings:type_name -> xray.app.proxyman.MultiplexingConfig
-	15, // [15:15] is the sub-list for method output_type
-	15, // [15:15] is the sub-list for method input_type
-	15, // [15:15] is the sub-list for extension type_name
-	15, // [15:15] is the sub-list for extension extendee
-	0,  // [0:15] is the sub-list for field type_name
+	10, // 15: xray.app.proxyman.SenderConfig.smux_settings:type_name -> xray.app.proxyman.SingMultiplexConfig
+	16, // [16:16] is the sub-list for method output_type
+	16, // [16:16] is the sub-list for method input_type
+	16, // [16:16] is the sub-list for extension type_name
+	16, // [16:16] is the sub-list for extension extendee
+	0,  // [0:16] is the sub-list for field type_name
 }
 
 func init() { file_app_proxyman_config_proto_init() }
@@ -1055,7 +1170,7 @@ func file_app_proxyman_config_proto_init() {
 			}
 		}
 		file_app_proxyman_config_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*AllocationStrategy_AllocationStrategyConcurrency); i {
+			switch v := v.(*SingMultiplexConfig); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1067,6 +1182,18 @@ func file_app_proxyman_config_proto_init() {
 			}
 		}
 		file_app_proxyman_config_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*AllocationStrategy_AllocationStrategyConcurrency); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_proxyman_config_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*AllocationStrategy_AllocationStrategyRefresh); i {
 			case 0:
 				return &v.state
@@ -1085,7 +1212,7 @@ func file_app_proxyman_config_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_app_proxyman_config_proto_rawDesc,
 			NumEnums:      2,
-			NumMessages:   10,
+			NumMessages:   11,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

app/proxyman/config.proto

@@ -91,6 +91,7 @@ message SenderConfig {
   xray.transport.internet.StreamConfig stream_settings = 2;
   xray.transport.internet.ProxyConfig proxy_settings = 3;
   MultiplexingConfig multiplex_settings = 4;
+  SingMultiplexConfig smux_settings = 5;
 }
 
 message MultiplexingConfig {
@@ -103,3 +104,12 @@ message MultiplexingConfig {
   // "reject" (default), "allow" or "skip".
   string xudpProxyUDP443 = 4;
 }
+
+message SingMultiplexConfig {
+  bool enabled = 1;
+  string protocol = 2;
+  int32 max_connections = 3;
+  int32 min_streams = 4;
+  int32 max_streams = 5;
+  bool padding = 6;
+}

app/proxyman/outbound/handler.go

@@ -6,12 +6,15 @@ import (
 	"io"
 	"os"
 
+	sing_mux "github.com/sagernet/sing-mux"
+	sing_net "github.com/sagernet/sing/common/network"
 	"github.com/xtls/xray-core/app/proxyman"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/mux"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/common/singbridge"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/outbound"
 	"github.com/xtls/xray-core/features/policy"
@@ -58,6 +61,8 @@ type Handler struct {
 	outboundManager outbound.Manager
 	mux             *mux.ClientManager
 	xudp            *mux.ClientManager
+	smux            *sing_mux.Client
+
 	udp443          string
 	uplinkCounter   stats.Counter
 	downlinkCounter stats.Counter
@@ -154,6 +159,21 @@ func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbou
 			h.udp443 = config.XudpProxyUDP443
 		}
 	}
+	if h.senderSettings != nil && h.senderSettings.SmuxSettings != nil {
+		if config := h.senderSettings.SmuxSettings; config.Enabled {
+			h.smux, err = sing_mux.NewClient(sing_mux.Options{
+				Dialer:         singbridge.NewOutboundDialer(proxyHandler, h),
+				Protocol:       config.Protocol,
+				MaxConnections: int(config.MaxConnections),
+				MinStreams:     int(config.MinStreams),
+				MaxStreams:     int(config.MaxStreams),
+				Padding:        config.Padding,
+			})
+			if err != nil {
+				return nil, newError("failed to create sing mux client").Base(err)
+			}
+		}
+	}
 
 	h.proxy = proxyHandler
 	return h, nil
@@ -197,6 +217,34 @@ func (h *Handler) Dispatch(ctx context.Context, link *transport.Link) {
 			return
 		}
 	}
+	if h.smux != nil {
+		test := func(err error) {
+			if err != nil {
+				err := newError("failed to process mux outbound traffic").Base(err)
+				session.SubmitOutboundErrorToOriginator(ctx, err)
+				err.WriteToLog(session.ExportIDToError(ctx))
+				common.Interrupt(link.Writer)
+			}
+		}
+		inbound := session.InboundFromContext(ctx)
+		outbound := session.OutboundFromContext(ctx)
+		if outbound.Target.Network == net.Network_TCP {
+			conn, err := h.smux.DialContext(ctx, sing_net.NetworkTCP, singbridge.ToSocksaddr(outbound.Target))
+			if err != nil {
+				test(err)
+				return
+			}
+			test(singbridge.CopyConn(ctx, inbound.Conn, link, conn))
+		} else {
+			packetConn, err := h.smux.ListenPacket(ctx, singbridge.ToSocksaddr(outbound.Target))
+			if err != nil {
+				test(err)
+				return
+			}
+			test(singbridge.CopyPacketConn(ctx, inbound.Conn, link, outbound.Target, packetConn))
+		}
+		return
+	}
 out:
 	err := h.proxy.Process(ctx, link, h)
 	if err != nil {

common/buf/reader.go

@@ -7,7 +7,7 @@ import (
 	"github.com/xtls/xray-core/common/errors"
 )
 
-func readOneUDP(r io.Reader) (*Buffer, error) {
+func ReadOneUDP(r io.Reader) (*Buffer, error) {
 	b := New()
 	for i := 0; i < 64; i++ {
 		_, err := b.ReadFrom(r)
@@ -166,7 +166,7 @@ type PacketReader struct {
 
 // ReadMultiBuffer implements Reader.
 func (r *PacketReader) ReadMultiBuffer() (MultiBuffer, error) {
-	b, err := readOneUDP(r.Reader)
+	b, err := ReadOneUDP(r.Reader)
 	if err != nil {
 		return nil, err
 	}

common/mux/server.go

@@ -4,13 +4,17 @@ import (
 	"context"
 	"io"
 
+	sing_mux "github.com/sagernet/sing-mux"
+	"github.com/sagernet/sing/common/metadata"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/common/protocol"
 	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/common/singbridge"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/transport"
@@ -38,6 +42,14 @@ func (s *Server) Type() interface{} {
 // Dispatch implements routing.Dispatcher
 func (s *Server) Dispatch(ctx context.Context, dest net.Destination) (*transport.Link, error) {
 	if dest.Address != muxCoolAddress {
+		if dest.Address.Family() == net.AddressFamilyDomain && dest.Address.Domain() == sing_mux.Destination.Fqdn {
+			opts := pipe.OptionsFromContext(ctx)
+			uplinkReader, uplinkWriter := pipe.New(opts...)
+			downlinkReader, downlinkWriter := pipe.New(opts...)
+			conn := cnc.NewConnection(cnc.ConnectionInputMulti(downlinkWriter), cnc.ConnectionOutputMulti(uplinkReader))
+			go sing_mux.HandleConnection(ctx, singbridge.NewDispatcher(s.dispatcher, newError), singbridge.NewLogger(newError), conn, metadata.Metadata{Destination: singbridge.ToSocksaddr(dest)})
+			return &transport.Link{Reader: downlinkReader, Writer: uplinkWriter}, nil
+		}
 		return s.dispatcher.Dispatch(ctx, dest)
 	}
 
@@ -59,6 +71,10 @@ func (s *Server) Dispatch(ctx context.Context, dest net.Destination) (*transport
 // DispatchLink implements routing.Dispatcher
 func (s *Server) DispatchLink(ctx context.Context, dest net.Destination, link *transport.Link) error {
 	if dest.Address != muxCoolAddress {
+		if dest.Address.Family() == net.AddressFamilyDomain && dest.Address.Domain() == sing_mux.Destination.Fqdn {
+			conn := cnc.NewConnection(cnc.ConnectionInputMulti(link.Writer), cnc.ConnectionOutputMulti(link.Reader))
+			return sing_mux.HandleConnection(ctx, singbridge.NewDispatcher(s.dispatcher, newError), singbridge.NewLogger(newError), conn, metadata.Metadata{Destination: singbridge.ToSocksaddr(dest)})
+		}
 		return s.dispatcher.DispatchLink(ctx, dest, link)
 	}
 	_, err := NewServerWorker(ctx, s.dispatcher, link)

common/singbridge/handler.go

@@ -2,11 +2,10 @@ package singbridge
 
 import (
 	"context"
-	"io"
 
+	"github.com/sagernet/sing/common/bufio"
 	M "github.com/sagernet/sing/common/metadata"
 	N "github.com/sagernet/sing/common/network"
-	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/session"
@@ -40,9 +39,10 @@ func (d *Dispatcher) NewConnection(ctx context.Context, conn net.Conn, metadata
 }
 
 func (d *Dispatcher) NewPacketConnection(ctx context.Context, conn N.PacketConn, metadata M.Metadata) error {
+	packetConn := &PacketConn{bufio.NewBindPacketConn(conn.(net.PacketConn), metadata.Destination), ToDestination(metadata.Destination, net.Network_UDP)}
 	return d.upstream.DispatchLink(ctx, ToDestination(metadata.Destination, net.Network_UDP), &transport.Link{
-		Reader: buf.NewPacketReader(conn.(io.Reader)),
-		Writer: buf.NewWriter(conn.(io.Writer)),
+		Reader: packetConn,
+		Writer: packetConn,
 	})
 }
 

common/singbridge/reader.go

@@ -14,6 +14,9 @@ var (
 	_ buf.Reader        = (*Conn)(nil)
 	_ buf.TimeoutReader = (*Conn)(nil)
 	_ buf.Writer        = (*Conn)(nil)
+	_ buf.Reader        = (*PacketConn)(nil)
+	_ buf.TimeoutReader = (*PacketConn)(nil)
+	_ buf.Writer        = (*PacketConn)(nil)
 )
 
 type Conn struct {
@@ -64,3 +67,32 @@ func (c *Conn) WriteMultiBuffer(bufferList buf.MultiBuffer) error {
 	}
 	return nil
 }
+
+type PacketConn struct {
+	net.Conn
+	destination net.Destination
+}
+
+func (c *PacketConn) ReadMultiBuffer() (buf.MultiBuffer, error) {
+	buffer, err := buf.ReadBuffer(c.Conn)
+	if err != nil {
+		return nil, err
+	}
+	buffer.UDP = &c.destination
+	return buf.MultiBuffer{buffer}, nil
+}
+
+func (c *PacketConn) ReadMultiBufferTimeout(duration time.Duration) (buf.MultiBuffer, error) {
+	err := c.SetReadDeadline(time.Now().Add(duration))
+	if err != nil {
+		return nil, err
+	}
+	defer c.SetReadDeadline(time.Time{})
+	return c.ReadMultiBuffer()
+}
+
+func (c *PacketConn) WriteMultiBuffer(mb buf.MultiBuffer) error {
+	mb, err := buf.WriteMultiBuffer(c.Conn, mb)
+	buf.ReleaseMulti(mb)
+	return err
+}

go.mod

@@ -13,7 +13,8 @@ require (
 	github.com/pires/go-proxyproto v0.7.0
 	github.com/quic-go/quic-go v0.34.0
 	github.com/refraction-networking/utls v1.3.2
-	github.com/sagernet/sing v0.2.4
+	github.com/sagernet/sing v0.2.5-0.20230423085534-0902e6216207
+	github.com/sagernet/sing-mux v0.0.0-20230425101127-4e8851eb1a2c
 	github.com/sagernet/sing-shadowsocks v0.2.1
 	github.com/sagernet/wireguard-go v0.0.0-20221116151939-c99467f53f2c
 	github.com/seiflotfy/cuckoofilter v0.0.0-20220411075957-e3b120b3f5fb
@@ -41,6 +42,7 @@ require (
 	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
 	github.com/google/btree v1.1.2 // indirect
 	github.com/google/pprof v0.0.0-20230406165453-00490a63f317 // indirect
+	github.com/hashicorp/yamux v0.1.1 // indirect
 	github.com/klauspost/compress v1.16.5 // indirect
 	github.com/klauspost/cpuid/v2 v2.2.4 // indirect
 	github.com/onsi/ginkgo/v2 v2.9.2 // indirect
@@ -48,6 +50,7 @@ require (
 	github.com/quic-go/qtls-go1-19 v0.3.2 // indirect
 	github.com/quic-go/qtls-go1-20 v0.2.2 // indirect
 	github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 // indirect
+	github.com/sagernet/smux v0.0.0-20230312102458-337ec2a5af37 // indirect
 	go.uber.org/atomic v1.10.0 // indirect
 	golang.org/x/exp v0.0.0-20230321023759-10a507213a29 // indirect
 	golang.org/x/mod v0.10.0 // indirect

go.sum

@@ -89,6 +89,8 @@ github.com/gregjones/httpcache v0.0.0-20180305231024-9cad4c3443a7/go.mod h1:Fecb
 github.com/grpc-ecosystem/grpc-gateway v1.5.0/go.mod h1:RSKVYQBd5MCa4OVpNdGskqpgL2+G+NZTnrVHpWWfpdw=
 github.com/h12w/go-socks5 v0.0.0-20200522160539-76189e178364 h1:5XxdakFhqd9dnXoAZy1Mb2R/DZ6D1e+0bGC/JhucGYI=
 github.com/h12w/go-socks5 v0.0.0-20200522160539-76189e178364/go.mod h1:eDJQioIyy4Yn3MVivT7rv/39gAJTrA7lgmYr8EW950c=
+github.com/hashicorp/yamux v0.1.1 h1:yrQxtgseBDrq9Y652vSRDvsKCJKOUD+GzTS4Y0Y8pvE=
+github.com/hashicorp/yamux v0.1.1/go.mod h1:CtWFDAQgb7dxtzFs4tWbplKIe2jSi3+5vKbgIO0SLnQ=
 github.com/jellevandenhooff/dkim v0.0.0-20150330215556-f50fe3d243e1/go.mod h1:E0B/fFc00Y+Rasa88328GlI/XbtyysCtTHZS8h7IrBU=
 github.com/json-iterator/go v1.1.6/go.mod h1:+SdeFBvtyEkXs7REEP0seUULqWtbJapLOCVDaaPEHmU=
 github.com/jstemmer/go-junit-report v0.0.0-20190106144839-af01ea7f8024/go.mod h1:6v2b51hI/fHJwM22ozAgKL4VKDeJcHhJFhtBdhmNjmU=
@@ -143,12 +145,15 @@ github.com/refraction-networking/utls v1.3.2/go.mod h1:fmoaOww2bxzzEpIKOebIsnBvj
 github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 h1:f/FNXud6gA3MNr8meMVVGxhp+QBTqY91tM8HjEuMjGg=
 github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3/go.mod h1:HgjTstvQsPGkxUsCd2KWxErBblirPizecHcpD3ffK+s=
 github.com/russross/blackfriday v1.5.2/go.mod h1:JO/DiYxRf+HjHt06OyowR9PTA263kcR/rfWxYHBV53g=
-github.com/sagernet/sing v0.2.3 h1:V50MvZ4c3Iij2lYFWPlzL1PyipwSzjGeN9x+Ox89vpk=
-github.com/sagernet/sing v0.2.3/go.mod h1:Ta8nHnDLAwqySzKhGoKk4ZIB+vJ3GTKj7UPrWYvM+4w=
-github.com/sagernet/sing v0.2.4 h1:gC8BR5sglbJZX23RtMyFa8EETP9YEUADhfbEzU1yVbo=
-github.com/sagernet/sing v0.2.4/go.mod h1:Ta8nHnDLAwqySzKhGoKk4ZIB+vJ3GTKj7UPrWYvM+4w=
+github.com/sagernet/sing v0.1.8/go.mod h1:jt1w2u7lJQFFSGLiRrRIs5YWmx4kAPfWuOejuDW9qMk=
+github.com/sagernet/sing v0.2.5-0.20230423085534-0902e6216207 h1:+dDVjW20IT+e8maKryaDeRY2+RFmTFdrQeIzqE2WOss=
+github.com/sagernet/sing v0.2.5-0.20230423085534-0902e6216207/go.mod h1:Ta8nHnDLAwqySzKhGoKk4ZIB+vJ3GTKj7UPrWYvM+4w=
+github.com/sagernet/sing-mux v0.0.0-20230425101127-4e8851eb1a2c h1:56vRmAIFvQZi9V2kNBNM/tOinmLtR9hx1xAWeDbTZb4=
+github.com/sagernet/sing-mux v0.0.0-20230425101127-4e8851eb1a2c/go.mod h1:pF+RnLvCAOhECrvauy6LYOpBakJ/vuaF1Wm4lPsWryI=
 github.com/sagernet/sing-shadowsocks v0.2.1 h1:FvdLQOqpvxHBJUcUe4fvgiYP2XLLwH5i1DtXQviVEPw=
 github.com/sagernet/sing-shadowsocks v0.2.1/go.mod h1:T/OgurSjsAe+Ug3+6PprXjmgHFmJidjOvQcjXGTKb3I=
+github.com/sagernet/smux v0.0.0-20230312102458-337ec2a5af37 h1:HuE6xSwco/Xed8ajZ+coeYLmioq0Qp1/Z2zczFaV8as=
+github.com/sagernet/smux v0.0.0-20230312102458-337ec2a5af37/go.mod h1:3skNSftZDJWTGVtVaM2jfbce8qHnmH/AGDRe62iNOg0=
 github.com/sagernet/wireguard-go v0.0.0-20221116151939-c99467f53f2c h1:vK2wyt9aWYHHvNLWniwijBu/n4pySypiKRhN32u/JGo=
 github.com/sagernet/wireguard-go v0.0.0-20221116151939-c99467f53f2c/go.mod h1:euOmN6O5kk9dQmgSS8Df4psAl3TCjxOz0NW60EWkSaI=
 github.com/seiflotfy/cuckoofilter v0.0.0-20220411075957-e3b120b3f5fb h1:XfLJSPIOUX+osiMraVgIrMR27uMXnRJWGm1+GL8/63U=
@@ -257,6 +262,7 @@ golang.org/x/sys v0.0.0-20210510120138-977fb7262007/go.mod h1:oPkhp1MJrh7nUepCBc
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220704084225-05e143d24a9e/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220715151400-c0bba94af5f8/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
+golang.org/x/sys v0.5.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.7.0 h1:3jlCCIQZPdOYu1h8BkNvLz8Kgwtae2cagcG/VamtZRU=
 golang.org/x/sys v0.7.0/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=

infra/conf/xray.go

@@ -130,6 +130,24 @@ func (m *MuxConfig) Build() (*proxyman.MultiplexingConfig, error) {
 	}, nil
 }
 
+type SingMuxConfig struct {
+	Enabled        bool   `json:"enabled"`
+	Protocol       string `json:"protocol"`
+	MaxConnections int    `json:"max_connections"`
+	MinStreams     int    `json:"min_streams"`
+	MaxStreams     int    `json:"max_streams"`
+}
+
+func (m *SingMuxConfig) Build() (*proxyman.SingMultiplexConfig, error) {
+	return &proxyman.SingMultiplexConfig{
+		Enabled:        m.Enabled,
+		Protocol:       m.Protocol,
+		MaxConnections: int32(m.MaxConnections),
+		MinStreams:     int32(m.MinStreams),
+		MaxStreams:     int32(m.MaxStreams),
+	}, nil
+}
+
 type InboundDetourAllocationConfig struct {
 	Strategy    string  `json:"strategy"`
 	Concurrency *uint32 `json:"concurrency"`
@@ -285,6 +303,7 @@ type OutboundDetourConfig struct {
 	StreamSetting   *StreamConfig    `json:"streamSettings"`
 	ProxySettings   *ProxyConfig     `json:"proxySettings"`
 	MuxSettings     *MuxConfig       `json:"mux"`
+	SingMuxSettings *SingMuxConfig   `json:"smux"`
 }
 
 func (c *OutboundDetourConfig) checkChainProxyConfig() error {
@@ -347,6 +366,13 @@ func (c *OutboundDetourConfig) Build() (*core.OutboundHandlerConfig, error) {
 		}
 		senderSettings.MultiplexSettings = ms
 	}
+	if c.SingMuxSettings != nil {
+		ms, err := c.SingMuxSettings.Build()
+		if err != nil {
+			return nil, newError("failed to build sing-mux config.").Base(err)
+		}
+		senderSettings.SmuxSettings = ms
+	}
 
 	settings := []byte("{}")
 	if c.Settings != nil {

transport/internet/grpc/config_test.go

@@ -1,8 +1,9 @@
 package grpc
 
 import (
-	"github.com/stretchr/testify/assert"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestConfig_GetServiceName(t *testing.T) {