Feat: add PacketAddr support to Trojan server

proxy/trojan/config.pb.go

@@ -1,6 +1,13 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        v3.21.11
+// source: proxy/trojan/config.proto
+
 package trojan
 
 import (
+	packetaddr "github.com/v2fly/v2ray-core/v5/common/net/packetaddr"
 	protocol "github.com/v2fly/v2ray-core/v5/common/protocol"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
@@ -193,8 +200,9 @@ type ServerConfig struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Users     []*protocol.User `protobuf:"bytes,1,rep,name=users,proto3" json:"users,omitempty"`
-	Fallbacks []*Fallback      `protobuf:"bytes,3,rep,name=fallbacks,proto3" json:"fallbacks,omitempty"`
+	Users          []*protocol.User          `protobuf:"bytes,1,rep,name=users,proto3" json:"users,omitempty"`
+	Fallbacks      []*Fallback               `protobuf:"bytes,3,rep,name=fallbacks,proto3" json:"fallbacks,omitempty"`
+	PacketEncoding packetaddr.PacketAddrType `protobuf:"varint,4,opt,name=packet_encoding,json=packetEncoding,proto3,enum=v2ray.core.net.packetaddr.PacketAddrType" json:"packet_encoding,omitempty"`
 }
 
 func (x *ServerConfig) Reset() {
@@ -243,6 +251,13 @@ func (x *ServerConfig) GetFallbacks() []*Fallback {
 	return nil
 }
 
+func (x *ServerConfig) GetPacketEncoding() packetaddr.PacketAddrType {
+	if x != nil {
+		return x.PacketEncoding
+	}
+	return packetaddr.PacketAddrType(0)
+}
+
 var File_proxy_trojan_config_proto protoreflect.FileDescriptor
 
 var file_proxy_trojan_config_proto_rawDesc = []byte{
@@ -253,37 +268,44 @@ var file_proxy_trojan_config_proto_rawDesc = []byte{
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 }
 
 var (
@@ -306,16 +328,18 @@ var file_proxy_trojan_config_proto_goTypes = []interface{}{
 	(*ServerConfig)(nil),            // 3: v2ray.core.proxy.trojan.ServerConfig
 	(*protocol.ServerEndpoint)(nil), // 4: v2ray.core.common.protocol.ServerEndpoint
 	(*protocol.User)(nil),           // 5: v2ray.core.common.protocol.User
+	(packetaddr.PacketAddrType)(0),  // 6: v2ray.core.net.packetaddr.PacketAddrType
 }
 var file_proxy_trojan_config_proto_depIdxs = []int32{
 	4, // 0: v2ray.core.proxy.trojan.ClientConfig.server:type_name -> v2ray.core.common.protocol.ServerEndpoint
 	5, // 1: v2ray.core.proxy.trojan.ServerConfig.users:type_name -> v2ray.core.common.protocol.User
 	1, // 2: v2ray.core.proxy.trojan.ServerConfig.fallbacks:type_name -> v2ray.core.proxy.trojan.Fallback
-	3, // [3:3] is the sub-list for method output_type
-	3, // [3:3] is the sub-list for method input_type
-	3, // [3:3] is the sub-list for extension type_name
-	3, // [3:3] is the sub-list for extension extendee
-	0, // [0:3] is the sub-list for field type_name
+	6, // 3: v2ray.core.proxy.trojan.ServerConfig.packet_encoding:type_name -> v2ray.core.net.packetaddr.PacketAddrType
+	4, // [4:4] is the sub-list for method output_type
+	4, // [4:4] is the sub-list for method input_type
+	4, // [4:4] is the sub-list for extension type_name
+	4, // [4:4] is the sub-list for extension extendee
+	0, // [0:4] is the sub-list for field type_name
 }
 
 func init() { file_proxy_trojan_config_proto_init() }

proxy/trojan/config.proto

@@ -8,6 +8,7 @@ option java_multiple_files = true;
 
 import "common/protocol/user.proto";
 import "common/protocol/server_spec.proto";
+import "common/net/packetaddr/config.proto";
 
 message Account {
   string password = 1;
@@ -28,4 +29,5 @@ message ClientConfig {
 message ServerConfig {
   repeated v2ray.core.common.protocol.User users = 1;
   repeated Fallback fallbacks = 3;
+  v2ray.core.net.packetaddr.PacketAddrType packet_encoding = 4;
 }

proxy/trojan/server.go

@@ -12,6 +12,7 @@ import (
 	"github.com/v2fly/v2ray-core/v5/common/errors"
 	"github.com/v2fly/v2ray-core/v5/common/log"
 	"github.com/v2fly/v2ray-core/v5/common/net"
+	packetaddr "github.com/v2fly/v2ray-core/v5/common/net/packetaddr"
 	"github.com/v2fly/v2ray-core/v5/common/protocol"
 	udp_proto "github.com/v2fly/v2ray-core/v5/common/protocol/udp"
 	"github.com/v2fly/v2ray-core/v5/common/retry"
@@ -33,9 +34,10 @@ func init() {
 
 // Server is an inbound connection handler that handles messages in trojan protocol.
 type Server struct {
-	policyManager policy.Manager
-	validator     *Validator
-	fallbacks     map[string]map[string]*Fallback // or nil
+	policyManager  policy.Manager
+	validator      *Validator
+	fallbacks      map[string]map[string]*Fallback // or nil
+	packetEncoding packetaddr.PacketAddrType
 }
 
 // NewServer creates a new trojan inbound handler.
@@ -54,8 +56,9 @@ func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
 
 	v := core.MustFromContext(ctx)
 	server := &Server{
-		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
-		validator:     validator,
+		policyManager:  v.GetFeature(policy.ManagerType()).(policy.Manager),
+		validator:      validator,
+		packetEncoding: config.PacketEncoding,
 	}
 
 	if config.Fallbacks != nil {
@@ -204,7 +207,16 @@ func (s *Server) Process(ctx context.Context, network net.Network, conn internet
 }
 
 func (s *Server) handleUDPPayload(ctx context.Context, clientReader *PacketReader, clientWriter *PacketWriter, dispatcher routing.Dispatcher) error {
-	udpServer := udp.NewSplitDispatcher(dispatcher, func(ctx context.Context, packet *udp_proto.Packet) {
+	udpDispatcherConstructor := udp.NewSplitDispatcher
+	switch s.packetEncoding {
+	case packetaddr.PacketAddrType_None:
+		break
+	case packetaddr.PacketAddrType_Packet:
+		packetAddrDispatcherFactory := udp.NewPacketAddrDispatcherCreator(ctx)
+		udpDispatcherConstructor = packetAddrDispatcherFactory.NewPacketAddrDispatcher
+	}
+
+	udpServer := udpDispatcherConstructor(dispatcher, func(ctx context.Context, packet *udp_proto.Packet) {
 		if err := clientWriter.WriteMultiBufferWithMetadata(buf.MultiBuffer{packet.Payload}, packet.Source); err != nil {
 			newError("failed to write response").Base(err).AtWarning().WriteToLog(session.ExportIDToError(ctx))
 		}
@@ -225,8 +237,8 @@ func (s *Server) handleUDPPayload(ctx context.Context, clientReader *PacketReade
 				}
 				return nil
 			}
-
-			ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
+			currentPacketCtx := ctx
+			currentPacketCtx = log.ContextWithAccessMessage(currentPacketCtx, &log.AccessMessage{
 				From:   inbound.Source,
 				To:     p.Target,
 				Status: log.AccessAccepted,
@@ -236,7 +248,7 @@ func (s *Server) handleUDPPayload(ctx context.Context, clientReader *PacketReade
 			newError("tunnelling request to ", p.Target).WriteToLog(session.ExportIDToError(ctx))
 
 			for _, b := range p.Buffer {
-				udpServer.Dispatch(ctx, p.Target, b)
+				udpServer.Dispatch(currentPacketCtx, p.Target, b)
 			}
 		}
 	}

proxy/trojan/simplified/config.go

@@ -22,6 +22,7 @@ func init() {
 				}
 				return
 			}(),
+			PacketEncoding: simplifiedServer.PacketEncoding,
 		}
 		return common.CreateObject(ctx, fullServer)
 	}))

proxy/trojan/simplified/config.pb.go

@@ -1,7 +1,14 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        v3.21.11
+// source: proxy/trojan/simplified/config.proto
+
 package simplified
 
 import (
 	net "github.com/v2fly/v2ray-core/v5/common/net"
+	packetaddr "github.com/v2fly/v2ray-core/v5/common/net/packetaddr"
 	_ "github.com/v2fly/v2ray-core/v5/common/protoext"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
@@ -21,7 +28,8 @@ type ServerConfig struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Users []string `protobuf:"bytes,1,rep,name=users,proto3" json:"users,omitempty"`
+	Users          []string                  `protobuf:"bytes,1,rep,name=users,proto3" json:"users,omitempty"`
+	PacketEncoding packetaddr.PacketAddrType `protobuf:"varint,2,opt,name=packet_encoding,json=packetEncoding,proto3,enum=v2ray.core.net.packetaddr.PacketAddrType" json:"packet_encoding,omitempty"`
 }
 
 func (x *ServerConfig) Reset() {
@@ -63,6 +71,13 @@ func (x *ServerConfig) GetUsers() []string {
 	return nil
 }
 
+func (x *ServerConfig) GetPacketEncoding() packetaddr.PacketAddrType {
+	if x != nil {
+		return x.PacketEncoding
+	}
+	return packetaddr.PacketAddrType(0)
+}
+
 type ClientConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -137,30 +152,37 @@ var file_proxy_trojan_simplified_config_proto_rawDesc = []byte{
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 }
 
 var (
@@ -177,17 +199,19 @@ func file_proxy_trojan_simplified_config_proto_rawDescGZIP() []byte {
 
 var file_proxy_trojan_simplified_config_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
 var file_proxy_trojan_simplified_config_proto_goTypes = []interface{}{
-	(*ServerConfig)(nil),   // 0: v2ray.core.proxy.trojan.simplified.ServerConfig
-	(*ClientConfig)(nil),   // 1: v2ray.core.proxy.trojan.simplified.ClientConfig
-	(*net.IPOrDomain)(nil), // 2: v2ray.core.common.net.IPOrDomain
+	(*ServerConfig)(nil),           // 0: v2ray.core.proxy.trojan.simplified.ServerConfig
+	(*ClientConfig)(nil),           // 1: v2ray.core.proxy.trojan.simplified.ClientConfig
+	(packetaddr.PacketAddrType)(0), // 2: v2ray.core.net.packetaddr.PacketAddrType
+	(*net.IPOrDomain)(nil),         // 3: v2ray.core.common.net.IPOrDomain
 }
 var file_proxy_trojan_simplified_config_proto_depIdxs = []int32{
-	2, // 0: v2ray.core.proxy.trojan.simplified.ClientConfig.address:type_name -> v2ray.core.common.net.IPOrDomain
-	1, // [1:1] is the sub-list for method output_type
-	1, // [1:1] is the sub-list for method input_type
-	1, // [1:1] is the sub-list for extension type_name
-	1, // [1:1] is the sub-list for extension extendee
-	0, // [0:1] is the sub-list for field type_name
+	2, // 0: v2ray.core.proxy.trojan.simplified.ServerConfig.packet_encoding:type_name -> v2ray.core.net.packetaddr.PacketAddrType
+	3, // 1: v2ray.core.proxy.trojan.simplified.ClientConfig.address:type_name -> v2ray.core.common.net.IPOrDomain
+	2, // [2:2] is the sub-list for method output_type
+	2, // [2:2] is the sub-list for method input_type
+	2, // [2:2] is the sub-list for extension type_name
+	2, // [2:2] is the sub-list for extension extendee
+	0, // [0:2] is the sub-list for field type_name
 }
 
 func init() { file_proxy_trojan_simplified_config_proto_init() }

proxy/trojan/simplified/config.proto

@@ -8,12 +8,14 @@ option java_multiple_files = true;
 
 import "common/protoext/extensions.proto";
 import "common/net/address.proto";
+import "common/net/packetaddr/config.proto";
 
 message ServerConfig{
   option (v2ray.core.common.protoext.message_opt).type = "inbound";
   option (v2ray.core.common.protoext.message_opt).short_name = "trojan";
 
   repeated string users = 1;
+  v2ray.core.net.packetaddr.PacketAddrType packet_encoding = 2;
 }
 
 message ClientConfig {