Outbound: One endpoint and at most one user only (#5144)

https://github.com/XTLS/Xray-core/pull/5124#issuecomment-3281091009

Fixes https://github.com/XTLS/Xray-core/pull/5124#pullrequestreview-3218097421

proxy/http/client.go

@@ -31,7 +31,7 @@ import (
 )
 
 type Client struct {
-	serverPicker  protocol.ServerPicker
+	server        *protocol.ServerSpec
 	policyManager policy.Manager
 	header        []*Header
 }
@@ -48,21 +48,17 @@ var (
 
 // NewClient create a new http client based on the given config.
 func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
-	serverList := protocol.NewServerList()
-	for _, rec := range config.Server {
-		s, err := protocol.NewServerSpecFromPB(rec)
-		if err != nil {
-			return nil, errors.New("failed to get server spec").Base(err)
-		}
-		serverList.AddServer(s)
+	if config.Server == nil {
+		return nil, errors.New(`no target server found`)
 	}
-	if serverList.Size() == 0 {
-		return nil, errors.New("0 target server")
+	server, err := protocol.NewServerSpecFromPB(config.Server)
+	if err != nil {
+		return nil, errors.New("failed to get server spec").Base(err)
 	}
 
 	v := core.MustFromContext(ctx)
 	return &Client{
-		serverPicker:  protocol.NewRoundRobinServerPicker(serverList),
+		server:        server,
 		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
 		header:        config.Header,
 	}, nil
@@ -84,7 +80,9 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 		return errors.New("UDP is not supported by HTTP outbound")
 	}
 
-	var user *protocol.MemoryUser
+	server := c.server
+	dest := server.Destination
+	user := server.User
 	var conn stat.Connection
 
 	mbuf, _ := link.Reader.ReadMultiBuffer()
@@ -102,10 +100,6 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 	}
 
 	if err := retry.ExponentialBackoff(5, 100).On(func() error {
-		server := c.serverPicker.PickServer()
-		dest := server.Destination()
-		user = server.PickUser()
-
 		netConn, err := setUpHTTPTunnel(ctx, dest, targetAddr, user, dialer, header, firstPayload)
 		if netConn != nil {
 			if _, ok := netConn.(*http2Conn); !ok {

proxy/http/config.pb.go

@@ -196,8 +196,8 @@ type ClientConfig struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Sever is a list of HTTP server addresses.
-	Server []*protocol.ServerEndpoint `protobuf:"bytes,1,rep,name=server,proto3" json:"server,omitempty"`
-	Header []*Header                  `protobuf:"bytes,2,rep,name=header,proto3" json:"header,omitempty"`
+	Server *protocol.ServerEndpoint `protobuf:"bytes,1,opt,name=server,proto3" json:"server,omitempty"`
+	Header []*Header                `protobuf:"bytes,2,rep,name=header,proto3" json:"header,omitempty"`
 }
 
 func (x *ClientConfig) Reset() {
@@ -230,7 +230,7 @@ func (*ClientConfig) Descriptor() ([]byte, []int) {
 	return file_proxy_http_config_proto_rawDescGZIP(), []int{3}
 }
 
-func (x *ClientConfig) GetServer() []*protocol.ServerEndpoint {
+func (x *ClientConfig) GetServer() *protocol.ServerEndpoint {
 	if x != nil {
 		return x.Server
 	}
@@ -275,7 +275,7 @@ var file_proxy_http_config_proto_rawDesc = []byte{
 	0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05,
 	0x76, 0x61, 0x6c, 0x75, 0x65, 0x22, 0x7d, 0x0a, 0x0c, 0x43, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x43,
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+	0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x24, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d,
 	0x6d, 0x6f, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x2e, 0x53, 0x65, 0x72,
 	0x76, 0x65, 0x72, 0x45, 0x6e, 0x64, 0x70, 0x6f, 0x69, 0x6e, 0x74, 0x52, 0x06, 0x73, 0x65, 0x72,
 	0x76, 0x65, 0x72, 0x12, 0x2f, 0x0a, 0x06, 0x68, 0x65, 0x61, 0x64, 0x65, 0x72, 0x18, 0x02, 0x20,

proxy/http/config.proto

@@ -28,6 +28,6 @@ message Header {
 // ClientConfig is the protobuf config for HTTP proxy client.
 message ClientConfig {
   // Sever is a list of HTTP server addresses.
-  repeated xray.common.protocol.ServerEndpoint server = 1;
+  xray.common.protocol.ServerEndpoint server = 1;
   repeated Header header = 2;
 }

proxy/shadowsocks/client.go

@@ -22,27 +22,23 @@ import (
 
 // Client is a inbound handler for Shadowsocks protocol
 type Client struct {
-	serverPicker  protocol.ServerPicker
+	server        *protocol.ServerSpec
 	policyManager policy.Manager
 }
 
 // NewClient create a new Shadowsocks client.
 func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
-	serverList := protocol.NewServerList()
-	for _, rec := range config.Server {
-		s, err := protocol.NewServerSpecFromPB(rec)
-		if err != nil {
-			return nil, errors.New("failed to parse server spec").Base(err)
-		}
-		serverList.AddServer(s)
+	if config.Server == nil {
+		return nil, errors.New(`no target server found`)
 	}
-	if serverList.Size() == 0 {
-		return nil, errors.New("0 server")
+	server, err := protocol.NewServerSpecFromPB(config.Server)
+	if err != nil {
+		return nil, errors.New("failed to get server spec").Base(err)
 	}
 
 	v := core.MustFromContext(ctx)
 	client := &Client{
-		serverPicker:  protocol.NewRoundRobinServerPicker(serverList),
+		server:        server,
 		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
 	}
 	return client, nil
@@ -60,13 +56,12 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 	destination := ob.Target
 	network := destination.Network
 
-	var server *protocol.ServerSpec
+	server := c.server
+	dest := server.Destination
+	dest.Network = network
 	var conn stat.Connection
 
 	err := retry.ExponentialBackoff(5, 100).On(func() error {
-		server = c.serverPicker.PickServer()
-		dest := server.Destination()
-		dest.Network = network
 		rawConn, err := dialer.Dial(ctx, dest)
 		if err != nil {
 			return err
@@ -78,7 +73,7 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 	if err != nil {
 		return errors.New("failed to find an available destination").AtWarning().Base(err)
 	}
-	errors.LogInfo(ctx, "tunneling request to ", destination, " via ", network, ":", server.Destination().NetAddr())
+	errors.LogInfo(ctx, "tunneling request to ", destination, " via ", network, ":", server.Destination.NetAddr())
 
 	defer conn.Close()
 
@@ -93,7 +88,7 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 		request.Command = protocol.RequestCommandUDP
 	}
 
-	user := server.PickUser()
+	user := server.User
 	_, ok := user.Account.(*MemoryAccount)
 	if !ok {
 		return errors.New("user account is not valid")

proxy/shadowsocks/config.pb.go

@@ -199,7 +199,7 @@ type ClientConfig struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Server []*protocol.ServerEndpoint `protobuf:"bytes,1,rep,name=server,proto3" json:"server,omitempty"`
+	Server *protocol.ServerEndpoint `protobuf:"bytes,1,opt,name=server,proto3" json:"server,omitempty"`
 }
 
 func (x *ClientConfig) Reset() {
@@ -232,7 +232,7 @@ func (*ClientConfig) Descriptor() ([]byte, []int) {
 	return file_proxy_shadowsocks_config_proto_rawDescGZIP(), []int{2}
 }
 
-func (x *ClientConfig) GetServer() []*protocol.ServerEndpoint {
+func (x *ClientConfig) GetServer() *protocol.ServerEndpoint {
 	if x != nil {
 		return x.Server
 	}
@@ -268,7 +268,7 @@ var file_proxy_shadowsocks_config_proto_rawDesc = []byte{
 	0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x6e, 0x65, 0x74, 0x2e, 0x4e,
 	0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x52, 0x07, 0x6e, 0x65, 0x74, 0x77, 0x6f, 0x72, 0x6b, 0x22,
 	0x4c, 0x0a, 0x0c, 0x43, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12,
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 	0x70, 0x6f, 0x69, 0x6e, 0x74, 0x52, 0x06, 0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x2a, 0x74, 0x0a,

proxy/shadowsocks/config.proto

@@ -32,5 +32,5 @@ message ServerConfig {
 }
 
 message ClientConfig {
-  repeated xray.common.protocol.ServerEndpoint server = 1;
+  xray.common.protocol.ServerEndpoint server = 1;
 }

proxy/socks/client.go

@@ -22,27 +22,23 @@ import (
 
 // Client is a Socks5 client.
 type Client struct {
-	serverPicker  protocol.ServerPicker
+	server        *protocol.ServerSpec
 	policyManager policy.Manager
 }
 
 // NewClient create a new Socks5 client based on the given config.
 func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
-	serverList := protocol.NewServerList()
-	for _, rec := range config.Server {
-		s, err := protocol.NewServerSpecFromPB(rec)
-		if err != nil {
-			return nil, errors.New("failed to get server spec").Base(err)
-		}
-		serverList.AddServer(s)
+	if config.Server == nil {
+		return nil, errors.New(`no target server found`)
 	}
-	if serverList.Size() == 0 {
-		return nil, errors.New("0 target server")
+	server, err := protocol.NewServerSpecFromPB(config.Server)
+	if err != nil {
+		return nil, errors.New("failed to get server spec").Base(err)
 	}
 
 	v := core.MustFromContext(ctx)
 	c := &Client{
-		serverPicker:  protocol.NewRoundRobinServerPicker(serverList),
+		server:        server,
 		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
 	}
 
@@ -62,15 +58,12 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 	destination := ob.Target
 
 	// Outbound server.
-	var server *protocol.ServerSpec
-	// Outbound server's destination.
-	var dest net.Destination
+	server := c.server
+	dest := server.Destination
 	// Connection to the outbound server.
 	var conn stat.Connection
 
 	if err := retry.ExponentialBackoff(5, 100).On(func() error {
-		server = c.serverPicker.PickServer()
-		dest = server.Destination()
 		rawConn, err := dialer.Dial(ctx, dest)
 		if err != nil {
 			return err
@@ -101,7 +94,7 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 		request.Command = protocol.RequestCommandUDP
 	}
 
-	user := server.PickUser()
+	user := server.User
 	if user != nil {
 		request.User = user
 		p = c.policyManager.ForLevel(user.Level)

proxy/socks/config.pb.go

@@ -210,7 +210,7 @@ type ClientConfig struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Sever is a list of Socks server addresses.
-	Server []*protocol.ServerEndpoint `protobuf:"bytes,1,rep,name=server,proto3" json:"server,omitempty"`
+	Server *protocol.ServerEndpoint `protobuf:"bytes,1,opt,name=server,proto3" json:"server,omitempty"`
 }
 
 func (x *ClientConfig) Reset() {
@@ -243,7 +243,7 @@ func (*ClientConfig) Descriptor() ([]byte, []int) {
 	return file_proxy_socks_config_proto_rawDescGZIP(), []int{2}
 }
 
-func (x *ClientConfig) GetServer() []*protocol.ServerEndpoint {
+func (x *ClientConfig) GetServer() *protocol.ServerEndpoint {
 	if x != nil {
 		return x.Server
 	}
@@ -286,7 +286,7 @@ var file_proxy_socks_config_proto_rawDesc = []byte{
 	0x6c, 0x75, 0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65,
 	0x3a, 0x02, 0x38, 0x01, 0x22, 0x4c, 0x0a, 0x0c, 0x43, 0x6c, 0x69, 0x65, 0x6e, 0x74, 0x43, 0x6f,
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+	0x20, 0x01, 0x28, 0x0b, 0x32, 0x24, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d,
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proxy/socks/config.proto

@@ -35,5 +35,5 @@ message ServerConfig {
 // ClientConfig is the protobuf config for Socks client.
 message ClientConfig {
   // Sever is a list of Socks server addresses.
-  repeated xray.common.protocol.ServerEndpoint server = 1;
+  xray.common.protocol.ServerEndpoint server = 1;
 }

proxy/trojan/client.go

@@ -22,27 +22,23 @@ import (
 
 // Client is a inbound handler for trojan protocol
 type Client struct {
-	serverPicker  protocol.ServerPicker
+	server        *protocol.ServerSpec
 	policyManager policy.Manager
 }
 
 // NewClient create a new trojan client.
 func NewClient(ctx context.Context, config *ClientConfig) (*Client, error) {
-	serverList := protocol.NewServerList()
-	for _, rec := range config.Server {
-		s, err := protocol.NewServerSpecFromPB(rec)
-		if err != nil {
-			return nil, errors.New("failed to parse server spec").Base(err)
-		}
-		serverList.AddServer(s)
+	if config.Server == nil {
+		return nil, errors.New(`no target server found`)
 	}
-	if serverList.Size() == 0 {
-		return nil, errors.New("0 server")
+	server, err := protocol.NewServerSpecFromPB(config.Server)
+	if err != nil {
+		return nil, errors.New("failed to get server spec").Base(err)
 	}
 
 	v := core.MustFromContext(ctx)
 	client := &Client{
-		serverPicker:  protocol.NewRoundRobinServerPicker(serverList),
+		server:        server,
 		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
 	}
 	return client, nil
@@ -60,12 +56,11 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 	destination := ob.Target
 	network := destination.Network
 
-	var server *protocol.ServerSpec
+	server := c.server
 	var conn stat.Connection
 
 	err := retry.ExponentialBackoff(5, 100).On(func() error {
-		server = c.serverPicker.PickServer()
-		rawConn, err := dialer.Dial(ctx, server.Destination())
+		rawConn, err := dialer.Dial(ctx, server.Destination)
 		if err != nil {
 			return err
 		}
@@ -76,11 +71,11 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 	if err != nil {
 		return errors.New("failed to find an available destination").AtWarning().Base(err)
 	}
-	errors.LogInfo(ctx, "tunneling request to ", destination, " via ", server.Destination().NetAddr())
+	errors.LogInfo(ctx, "tunneling request to ", destination, " via ", server.Destination.NetAddr())
 
 	defer conn.Close()
 
-	user := server.PickUser()
+	user := server.User
 	account, ok := user.Account.(*MemoryAccount)
 	if !ok {
 		return errors.New("user account is not valid")

proxy/trojan/config.pb.go

@@ -156,7 +156,7 @@ type ClientConfig struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Server []*protocol.ServerEndpoint `protobuf:"bytes,1,rep,name=server,proto3" json:"server,omitempty"`
+	Server *protocol.ServerEndpoint `protobuf:"bytes,1,opt,name=server,proto3" json:"server,omitempty"`
 }
 
 func (x *ClientConfig) Reset() {
@@ -189,7 +189,7 @@ func (*ClientConfig) Descriptor() ([]byte, []int) {
 	return file_proxy_trojan_config_proto_rawDescGZIP(), []int{2}
 }
 
-func (x *ClientConfig) GetServer() []*protocol.ServerEndpoint {
+func (x *ClientConfig) GetServer() *protocol.ServerEndpoint {
 	if x != nil {
 		return x.Server
 	}
@@ -271,7 +271,7 @@ var file_proxy_trojan_config_proto_rawDesc = []byte{
 	0x04, 0x64, 0x65, 0x73, 0x74, 0x12, 0x12, 0x0a, 0x04, 0x78, 0x76, 0x65, 0x72, 0x18, 0x06, 0x20,
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proxy/trojan/config.proto

@@ -23,7 +23,7 @@ message Fallback {
 }
 
 message ClientConfig {
-  repeated xray.common.protocol.ServerEndpoint server = 1;
+  xray.common.protocol.ServerEndpoint server = 1;
 }
 
 message ServerConfig {

proxy/vless/outbound/config.pb.go

@@ -26,7 +26,7 @@ type Config struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Vnext []*protocol.ServerEndpoint `protobuf:"bytes,1,rep,name=vnext,proto3" json:"vnext,omitempty"`
+	Vnext *protocol.ServerEndpoint `protobuf:"bytes,1,opt,name=vnext,proto3" json:"vnext,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -59,7 +59,7 @@ func (*Config) Descriptor() ([]byte, []int) {
 	return file_proxy_vless_outbound_config_proto_rawDescGZIP(), []int{0}
 }
 
-func (x *Config) GetVnext() []*protocol.ServerEndpoint {
+func (x *Config) GetVnext() *protocol.ServerEndpoint {
 	if x != nil {
 		return x.Vnext
 	}
@@ -76,7 +76,7 @@ var file_proxy_vless_outbound_config_proto_rawDesc = []byte{
 	0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x2f,
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proxy/vless/outbound/config.proto

@@ -9,5 +9,5 @@ option java_multiple_files = true;
 import "common/protocol/server_spec.proto";
 
 message Config {
-  repeated xray.common.protocol.ServerEndpoint vnext = 1;
+  xray.common.protocol.ServerEndpoint vnext = 1;
 }

proxy/vless/outbound/outbound.go

@@ -47,8 +47,7 @@ func init() {
 
 // Handler is an outbound connection handler for VLess protocol.
 type Handler struct {
-	serverList    *protocol.ServerList
-	serverPicker  protocol.ServerPicker
+	server        *protocol.ServerSpec
 	policyManager policy.Manager
 	cone          bool
 	encryption    *encryption.ClientInstance
@@ -57,24 +56,22 @@ type Handler struct {
 
 // New creates a new VLess outbound handler.
 func New(ctx context.Context, config *Config) (*Handler, error) {
-	serverList := protocol.NewServerList()
-	for _, rec := range config.Vnext {
-		s, err := protocol.NewServerSpecFromPB(rec)
-		if err != nil {
-			return nil, errors.New("failed to parse server spec").Base(err).AtError()
-		}
-		serverList.AddServer(s)
+	if config.Vnext == nil {
+		return nil, errors.New(`no vnext found`)
+	}
+	server, err := protocol.NewServerSpecFromPB(config.Vnext)
+	if err != nil {
+		return nil, errors.New("failed to get server spec").Base(err).AtError()
 	}
 
 	v := core.MustFromContext(ctx)
 	handler := &Handler{
-		serverList:    serverList,
-		serverPicker:  protocol.NewRoundRobinServerPicker(serverList),
+		server:        server,
 		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
 		cone:          ctx.Value("cone").(bool),
 	}
 
-	a := handler.serverPicker.PickServer().PickUser().Account.(*vless.MemoryAccount)
+	a := handler.server.User.Account.(*vless.MemoryAccount)
 	if a.Encryption != "" && a.Encryption != "none" {
 		s := strings.Split(a.Encryption, ".")
 		var nfsPKeysBytes [][]byte
@@ -125,12 +122,12 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	}
 	ob.Name = "vless"
 
-	var rec *protocol.ServerSpec
+	rec := h.server
 	var conn stat.Connection
+
 	if err := retry.ExponentialBackoff(5, 200).On(func() error {
-		rec = h.serverPicker.PickServer()
 		var err error
-		conn, err = dialer.Dial(ctx, rec.Destination())
+		conn, err = dialer.Dial(ctx, rec.Destination)
 		if err != nil {
 			return err
 		}
@@ -145,7 +142,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		iConn = statConn.Connection
 	}
 	target := ob.Target
-	errors.LogInfo(ctx, "tunneling request to ", target, " via ", rec.Destination().NetAddr())
+	errors.LogInfo(ctx, "tunneling request to ", target, " via ", rec.Destination.NetAddr())
 
 	if h.encryption != nil {
 		var err error
@@ -172,7 +169,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 
 	request := &protocol.RequestHeader{
 		Version: encoding.Version,
-		User:    rec.PickUser(),
+		User:    rec.User,
 		Command: command,
 		Address: target.Address,
 		Port:    target.Port,

proxy/vmess/encoding/commands.go

@@ -7,10 +7,7 @@ import (
 	"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/net"
 	"github.com/xtls/xray-core/common/protocol"
-	"github.com/xtls/xray-core/common/serial"
-	"github.com/xtls/xray-core/common/uuid"
 )
 
 var (
@@ -29,9 +26,6 @@ func MarshalCommand(command interface{}, writer io.Writer) error {
 	var cmdID byte
 	var factory CommandFactory
 	switch command.(type) {
-	case *protocol.CommandSwitchAccount:
-		factory = new(CommandSwitchAccountFactory)
-		cmdID = 1
 	default:
 		return ErrUnknownCommand
 	}
@@ -67,8 +61,6 @@ func UnmarshalCommand(cmdID byte, data []byte) (protocol.ResponseCommand, error)
 
 	var factory CommandFactory
 	switch cmdID {
-	case 1:
-		factory = new(CommandSwitchAccountFactory)
 	default:
 		return nil, ErrUnknownCommand
 	}
@@ -79,67 +71,3 @@ type CommandFactory interface {
 	Marshal(command interface{}, writer io.Writer) error
 	Unmarshal(data []byte) (interface{}, error)
 }
-
-type CommandSwitchAccountFactory struct{}
-
-func (f *CommandSwitchAccountFactory) Marshal(command interface{}, writer io.Writer) error {
-	cmd, ok := command.(*protocol.CommandSwitchAccount)
-	if !ok {
-		return ErrCommandTypeMismatch
-	}
-
-	hostStr := ""
-	if cmd.Host != nil {
-		hostStr = cmd.Host.String()
-	}
-	common.Must2(writer.Write([]byte{byte(len(hostStr))}))
-
-	if len(hostStr) > 0 {
-		common.Must2(writer.Write([]byte(hostStr)))
-	}
-
-	common.Must2(serial.WriteUint16(writer, cmd.Port.Value()))
-
-	idBytes := cmd.ID.Bytes()
-	common.Must2(writer.Write(idBytes))
-	common.Must2(serial.WriteUint16(writer, 0)) // compatible with legacy alterId
-	common.Must2(writer.Write([]byte{byte(cmd.Level)}))
-
-	common.Must2(writer.Write([]byte{cmd.ValidMin}))
-	return nil
-}
-
-func (f *CommandSwitchAccountFactory) Unmarshal(data []byte) (interface{}, error) {
-	cmd := new(protocol.CommandSwitchAccount)
-	if len(data) == 0 {
-		return nil, ErrInsufficientLength
-	}
-	lenHost := int(data[0])
-	if len(data) < lenHost+1 {
-		return nil, ErrInsufficientLength
-	}
-	if lenHost > 0 {
-		cmd.Host = net.ParseAddress(string(data[1 : 1+lenHost]))
-	}
-	portStart := 1 + lenHost
-	if len(data) < portStart+2 {
-		return nil, ErrInsufficientLength
-	}
-	cmd.Port = net.PortFromBytes(data[portStart : portStart+2])
-	idStart := portStart + 2
-	if len(data) < idStart+16 {
-		return nil, ErrInsufficientLength
-	}
-	cmd.ID, _ = uuid.ParseBytes(data[idStart : idStart+16])
-	levelStart := idStart + 16 + 2
-	if len(data) < levelStart+1 {
-		return nil, ErrInsufficientLength
-	}
-	cmd.Level = uint32(data[levelStart])
-	timeStart := levelStart + 1
-	if len(data) < timeStart+1 {
-		return nil, ErrInsufficientLength
-	}
-	cmd.ValidMin = data[timeStart]
-	return cmd, nil
-}

proxy/vmess/encoding/commands_test.go

@@ -1,55 +0,0 @@
-package encoding_test
-
-import (
-	"testing"
-
-	"github.com/google/go-cmp/cmp"
-	"github.com/stretchr/testify/assert"
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/buf"
-	"github.com/xtls/xray-core/common/protocol"
-	"github.com/xtls/xray-core/common/uuid"
-	. "github.com/xtls/xray-core/proxy/vmess/encoding"
-)
-
-func TestSwitchAccount(t *testing.T) {
-	sa := &protocol.CommandSwitchAccount{
-		Port:     1234,
-		ID:       uuid.New(),
-		Level:    128,
-		ValidMin: 16,
-	}
-
-	buffer := buf.New()
-	common.Must(MarshalCommand(sa, buffer))
-
-	cmd, err := UnmarshalCommand(1, buffer.BytesFrom(2))
-	common.Must(err)
-
-	sa2, ok := cmd.(*protocol.CommandSwitchAccount)
-	if !ok {
-		t.Fatal("failed to convert command to CommandSwitchAccount")
-	}
-	if r := cmp.Diff(sa2, sa); r != "" {
-		t.Error(r)
-	}
-}
-
-func TestSwitchAccountBugOffByOne(t *testing.T) {
-	sa := &protocol.CommandSwitchAccount{
-		Port:     1234,
-		ID:       uuid.New(),
-		Level:    128,
-		ValidMin: 16,
-	}
-
-	buffer := buf.New()
-	csaf := CommandSwitchAccountFactory{}
-	common.Must(csaf.Marshal(sa, buffer))
-
-	Payload := buffer.Bytes()
-
-	cmd, err := csaf.Unmarshal(Payload[:len(Payload)-1])
-	assert.Error(t, err)
-	assert.Nil(t, cmd)
-}

proxy/vmess/inbound/config.pb.go

@@ -118,7 +118,6 @@ type Config struct {
 
 	User    []*protocol.User `protobuf:"bytes,1,rep,name=user,proto3" json:"user,omitempty"`
 	Default *DefaultConfig   `protobuf:"bytes,2,opt,name=default,proto3" json:"default,omitempty"`
-	Detour  *DetourConfig    `protobuf:"bytes,3,opt,name=detour,proto3" json:"detour,omitempty"` // 4 is for legacy setting
 }
 
 func (x *Config) Reset() {
@@ -165,13 +164,6 @@ func (x *Config) GetDefault() *DefaultConfig {
 	return nil
 }
 
-func (x *Config) GetDetour() *DetourConfig {
-	if x != nil {
-		return x.Detour
-	}
-	return nil
-}
-
 var File_proxy_vmess_inbound_config_proto protoreflect.FileDescriptor
 
 var file_proxy_vmess_inbound_config_proto_rawDesc = []byte{
@@ -185,26 +177,21 @@ var file_proxy_vmess_inbound_config_proto_rawDesc = []byte{
 	0x20, 0x01, 0x28, 0x09, 0x52, 0x02, 0x74, 0x6f, 0x22, 0x25, 0x0a, 0x0d, 0x44, 0x65, 0x66, 0x61,
 	0x75, 0x6c, 0x74, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x14, 0x0a, 0x05, 0x6c, 0x65, 0x76,
 	0x65, 0x6c, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x05, 0x6c, 0x65, 0x76, 0x65, 0x6c, 0x22,
-	0xbb, 0x01, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x2e, 0x0a, 0x04, 0x75, 0x73,
-	0x65, 0x72, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x1a, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e,
-	0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x2e,
-	0x55, 0x73, 0x65, 0x72, 0x52, 0x04, 0x75, 0x73, 0x65, 0x72, 0x12, 0x41, 0x0a, 0x07, 0x64, 0x65,
-	0x66, 0x61, 0x75, 0x6c, 0x74, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x27, 0x2e, 0x78, 0x72,
-	0x61, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x76, 0x6d, 0x65, 0x73, 0x73, 0x2e, 0x69,
-	0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64, 0x2e, 0x44, 0x65, 0x66, 0x61, 0x75, 0x6c, 0x74, 0x43, 0x6f,
-	0x6e, 0x66, 0x69, 0x67, 0x52, 0x07, 0x64, 0x65, 0x66, 0x61, 0x75, 0x6c, 0x74, 0x12, 0x3e, 0x0a,
-	0x06, 0x64, 0x65, 0x74, 0x6f, 0x75, 0x72, 0x18, 0x03, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x26, 0x2e,
-	0x78, 0x72, 0x61, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x76, 0x6d, 0x65, 0x73, 0x73,
-	0x2e, 0x69, 0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64, 0x2e, 0x44, 0x65, 0x74, 0x6f, 0x75, 0x72, 0x43,
-	0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x06, 0x64, 0x65, 0x74, 0x6f, 0x75, 0x72, 0x42, 0x6a, 0x0a,
-	0x1c, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e,
-	0x76, 0x6d, 0x65, 0x73, 0x73, 0x2e, 0x69, 0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64, 0x50, 0x01, 0x5a,
-	0x2d, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73,
-	0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x78, 0x79,
-	0x2f, 0x76, 0x6d, 0x65, 0x73, 0x73, 0x2f, 0x69, 0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64, 0xaa, 0x02,
-	0x18, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x56, 0x6d, 0x65, 0x73,
-	0x73, 0x2e, 0x49, 0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
-	0x33,
+	0x7b, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x2e, 0x0a, 0x04, 0x75, 0x73, 0x65,
+	0x72, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x1a, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63,
+	0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x2e, 0x55,
+	0x73, 0x65, 0x72, 0x52, 0x04, 0x75, 0x73, 0x65, 0x72, 0x12, 0x41, 0x0a, 0x07, 0x64, 0x65, 0x66,
+	0x61, 0x75, 0x6c, 0x74, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x27, 0x2e, 0x78, 0x72, 0x61,
+	0x79, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x76, 0x6d, 0x65, 0x73, 0x73, 0x2e, 0x69, 0x6e,
+	0x62, 0x6f, 0x75, 0x6e, 0x64, 0x2e, 0x44, 0x65, 0x66, 0x61, 0x75, 0x6c, 0x74, 0x43, 0x6f, 0x6e,
+	0x66, 0x69, 0x67, 0x52, 0x07, 0x64, 0x65, 0x66, 0x61, 0x75, 0x6c, 0x74, 0x42, 0x6a, 0x0a, 0x1c,
+	0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x76,
+	0x6d, 0x65, 0x73, 0x73, 0x2e, 0x69, 0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64, 0x50, 0x01, 0x5a, 0x2d,
+	0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f,
+	0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x2f,
+	0x76, 0x6d, 0x65, 0x73, 0x73, 0x2f, 0x69, 0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64, 0xaa, 0x02, 0x18,
+	0x58, 0x72, 0x61, 0x79, 0x2e, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x2e, 0x56, 0x6d, 0x65, 0x73, 0x73,
+	0x2e, 0x49, 0x6e, 0x62, 0x6f, 0x75, 0x6e, 0x64, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -229,12 +216,11 @@ var file_proxy_vmess_inbound_config_proto_goTypes = []any{
 var file_proxy_vmess_inbound_config_proto_depIdxs = []int32{
 	3, // 0: xray.proxy.vmess.inbound.Config.user:type_name -> xray.common.protocol.User
 	1, // 1: xray.proxy.vmess.inbound.Config.default:type_name -> xray.proxy.vmess.inbound.DefaultConfig
-	0, // 2: xray.proxy.vmess.inbound.Config.detour:type_name -> xray.proxy.vmess.inbound.DetourConfig
-	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
+	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_vmess_inbound_config_proto_init() }

proxy/vmess/inbound/config.proto

@@ -19,6 +19,4 @@ message DefaultConfig {
 message Config {
   repeated xray.common.protocol.User user = 1;
   DefaultConfig default = 2;
-  DetourConfig detour = 3;
-  // 4 is for legacy setting
 }

proxy/vmess/inbound/inbound.go

@@ -106,7 +106,6 @@ type Handler struct {
 	inboundHandlerManager feature_inbound.Manager
 	clients               *vmess.TimedUserValidator
 	usersByEmail          *userByEmail
-	detours               *DetourConfig
 	sessionHistory        *encoding.SessionHistory
 }
 
@@ -117,7 +116,6 @@ func New(ctx context.Context, config *Config) (*Handler, error) {
 		policyManager:         v.GetFeature(policy.ManagerType()).(policy.Manager),
 		inboundHandlerManager: v.GetFeature(feature_inbound.ManagerType()).(feature_inbound.Manager),
 		clients:               vmess.NewTimedUserValidator(),
-		detours:               config.Detour,
 		usersByEmail:          newUserByEmail(config.GetDefaultValue()),
 		sessionHistory:        encoding.NewSessionHistory(),
 	}
@@ -323,38 +321,8 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection s
 	return nil
 }
 
+// Stub command generator
 func (h *Handler) generateCommand(ctx context.Context, request *protocol.RequestHeader) protocol.ResponseCommand {
-	if h.detours != nil {
-		tag := h.detours.To
-		if h.inboundHandlerManager != nil {
-			handler, err := h.inboundHandlerManager.GetHandler(ctx, tag)
-			if err != nil {
-				errors.LogWarningInner(ctx, err, "failed to get detour handler: ", tag)
-				return nil
-			}
-			proxyHandler, port, availableMin := handler.GetRandomInboundProxy()
-			inboundHandler, ok := proxyHandler.(*Handler)
-			if ok && inboundHandler != nil {
-				if availableMin > 255 {
-					availableMin = 255
-				}
-
-				errors.LogDebug(ctx, "pick detour handler for port ", port, " for ", availableMin, " minutes.")
-				user := inboundHandler.GetOrGenerateUser(request.User.Email)
-				if user == nil {
-					return nil
-				}
-				account := user.Account.(*vmess.MemoryAccount)
-				return &protocol.CommandSwitchAccount{
-					Port:     port,
-					ID:       account.ID.UUID(),
-					Level:    user.Level,
-					ValidMin: byte(availableMin),
-				}
-			}
-		}
-	}
-
 	return nil
 }
 

proxy/vmess/outbound/command.go

@@ -1,41 +1,14 @@
 package outbound
 
 import (
-	"time"
 
-	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/protocol"
-	"github.com/xtls/xray-core/proxy/vmess"
 )
 
-func (h *Handler) handleSwitchAccount(cmd *protocol.CommandSwitchAccount) {
-	rawAccount := &vmess.Account{
-		Id: cmd.ID.String(),
-		SecuritySettings: &protocol.SecurityConfig{
-			Type: protocol.SecurityType_AUTO,
-		},
-	}
-
-	account, err := rawAccount.AsAccount()
-	common.Must(err)
-	user := &protocol.MemoryUser{
-		Email:   "",
-		Level:   cmd.Level,
-		Account: account,
-	}
-	dest := net.TCPDestination(cmd.Host, cmd.Port)
-	until := time.Now().Add(time.Duration(cmd.ValidMin) * time.Minute)
-	h.serverList.AddServer(protocol.NewServerSpec(dest, protocol.BeforeTime(until), user))
-}
-
+// As a stub command consumer.
 func (h *Handler) handleCommand(dest net.Destination, cmd protocol.ResponseCommand) {
-	switch typedCommand := cmd.(type) {
-	case *protocol.CommandSwitchAccount:
-		if typedCommand.Host == nil {
-			typedCommand.Host = dest.Address
-		}
-		h.handleSwitchAccount(typedCommand)
+	switch cmd.(type) {
 	default:
 	}
 }

proxy/vmess/outbound/config.pb.go

@@ -26,7 +26,7 @@ type Config struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Receiver []*protocol.ServerEndpoint `protobuf:"bytes,1,rep,name=Receiver,proto3" json:"Receiver,omitempty"`
+	Receiver *protocol.ServerEndpoint `protobuf:"bytes,1,opt,name=Receiver,proto3" json:"Receiver,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -59,7 +59,7 @@ func (*Config) Descriptor() ([]byte, []int) {
 	return file_proxy_vmess_outbound_config_proto_rawDescGZIP(), []int{0}
 }
 
-func (x *Config) GetReceiver() []*protocol.ServerEndpoint {
+func (x *Config) GetReceiver() *protocol.ServerEndpoint {
 	if x != nil {
 		return x.Receiver
 	}
@@ -76,7 +76,7 @@ var file_proxy_vmess_outbound_config_proto_rawDesc = []byte{
 	0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x2f,
 	0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x5f, 0x73, 0x70, 0x65, 0x63, 0x2e, 0x70, 0x72, 0x6f, 0x74,
 	0x6f, 0x22, 0x4a, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x40, 0x0a, 0x08, 0x52,
-	0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x72, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x24, 0x2e,
+	0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x72, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x24, 0x2e,
 	0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74,
 	0x6f, 0x63, 0x6f, 0x6c, 0x2e, 0x53, 0x65, 0x72, 0x76, 0x65, 0x72, 0x45, 0x6e, 0x64, 0x70, 0x6f,
 	0x69, 0x6e, 0x74, 0x52, 0x08, 0x52, 0x65, 0x63, 0x65, 0x69, 0x76, 0x65, 0x72, 0x42, 0x6d, 0x0a,

proxy/vmess/outbound/config.proto

@@ -9,5 +9,5 @@ option java_multiple_files = true;
 import "common/protocol/server_spec.proto";
 
 message Config {
-  repeated xray.common.protocol.ServerEndpoint Receiver = 1;
+  xray.common.protocol.ServerEndpoint Receiver = 1;
 }

proxy/vmess/outbound/outbound.go

@@ -29,27 +29,24 @@ import (
 
 // Handler is an outbound connection handler for VMess protocol.
 type Handler struct {
-	serverList    *protocol.ServerList
-	serverPicker  protocol.ServerPicker
+	server        *protocol.ServerSpec
 	policyManager policy.Manager
 	cone          bool
 }
 
 // New creates a new VMess outbound handler.
 func New(ctx context.Context, config *Config) (*Handler, error) {
-	serverList := protocol.NewServerList()
-	for _, rec := range config.Receiver {
-		s, err := protocol.NewServerSpecFromPB(rec)
-		if err != nil {
-			return nil, errors.New("failed to parse server spec").Base(err)
-		}
-		serverList.AddServer(s)
+	if config.Receiver == nil {
+		return nil, errors.New(`no vnext found`)
+	}
+	server, err := protocol.NewServerSpecFromPB(config.Receiver)
+	if err != nil {
+		return nil, errors.New("failed to get server spec").Base(err)
 	}
 
 	v := core.MustFromContext(ctx)
 	handler := &Handler{
-		serverList:    serverList,
-		serverPicker:  protocol.NewRoundRobinServerPicker(serverList),
+		server:        server,
 		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
 		cone:          ctx.Value("cone").(bool),
 	}
@@ -67,11 +64,11 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	ob.Name = "vmess"
 	ob.CanSpliceCopy = 3
 
-	var rec *protocol.ServerSpec
+	rec := h.server
 	var conn stat.Connection
+
 	err := retry.ExponentialBackoff(5, 200).On(func() error {
-		rec = h.serverPicker.PickServer()
-		rawConn, err := dialer.Dial(ctx, rec.Destination())
+		rawConn, err := dialer.Dial(ctx, rec.Destination)
 		if err != nil {
 			return err
 		}
@@ -85,7 +82,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	defer conn.Close()
 
 	target := ob.Target
-	errors.LogInfo(ctx, "tunneling request to ", target, " via ", rec.Destination().NetAddr())
+	errors.LogInfo(ctx, "tunneling request to ", target, " via ", rec.Destination.NetAddr())
 
 	command := protocol.RequestCommandTCP
 	if target.Network == net.Network_UDP {
@@ -95,7 +92,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		command = protocol.RequestCommandMux
 	}
 
-	user := rec.PickUser()
+	user := rec.User
 	request := &protocol.RequestHeader{
 		Version: encoding.Version,
 		User:    user,
@@ -202,7 +199,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		if err != nil {
 			return errors.New("failed to read header").Base(err)
 		}
-		h.handleCommand(rec.Destination(), header.Command)
+		h.handleCommand(rec.Destination, header.Command)
 
 		bodyReader, err := session.DecodeResponseBody(request, reader)
 		if err != nil {