v1.2.1

https://github.com/XTLS/Xray-core/issues/129#issuecomment-757355137

十分感谢 @GleenJi 等协助测试

app/commander/outbound.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/common/signal/done"
 	"github.com/xtls/xray-core/transport"
 )
@@ -79,7 +80,7 @@ func (co *Outbound) Dispatch(ctx context.Context, link *transport.Link) {
 	}
 
 	closeSignal := done.New()
-	c := net.NewConnection(net.ConnectionInputMulti(link.Writer), net.ConnectionOutputMulti(link.Reader), net.ConnectionOnClose(closeSignal))
+	c := cnc.NewConnection(cnc.ConnectionInputMulti(link.Writer), cnc.ConnectionOutputMulti(link.Reader), cnc.ConnectionOnClose(closeSignal))
 	co.listener.add(c)
 	co.access.RUnlock()
 	<-closeSignal.Wait()

app/dispatcher/default.go

@@ -263,9 +263,11 @@ func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.
 		skipRoutePick = content.SkipRoutePick
 	}
 
+	var inTag string
 	if d.router != nil && !skipRoutePick {
 		if route, err := d.router.PickRoute(routing_session.AsRoutingContext(ctx)); err == nil {
 			tag := route.GetOutboundTag()
+			inTag = route.GetInboundTag()
 			if h := d.ohm.GetHandler(tag); h != nil {
 				newError("taking detour [", tag, "] for [", destination, "]").WriteToLog(session.ExportIDToError(ctx))
 				handler = h
@@ -290,7 +292,11 @@ func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.
 
 	if accessMessage := log.AccessMessageFromContext(ctx); accessMessage != nil {
 		if tag := handler.Tag(); tag != "" {
-			accessMessage.Detour = tag
+			if inTag != "" {
+				accessMessage.Detour = inTag + " -> " + tag
+			} else {
+				accessMessage.Detour = tag
+			}
 		}
 		log.Record(accessMessage)
 	}

app/dns/dohdns.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/common/protocol/dns"
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/common/signal/pubsub"
@@ -65,9 +66,9 @@ func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, clientIP net.
 			if err != nil {
 				return nil, err
 			}
-			return net.NewConnection(
+			return cnc.NewConnection(
-				net.ConnectionInputMulti(link.Writer),
+				cnc.ConnectionInputMulti(link.Writer),
-				net.ConnectionOutputMulti(link.Reader),
+				cnc.ConnectionOutputMulti(link.Reader),
 			), nil
 		},
 	}

app/proxyman/inbound/always.go

@@ -136,6 +136,7 @@ func NewAlwaysOnInboundHandler(ctx context.Context, tag string, receiverConfig *
 					uplinkCounter:   uplinkCounter,
 					downlinkCounter: downlinkCounter,
 					stream:          mss,
+					ctx:             ctx,
 				}
 				h.workers = append(h.workers, worker)
 			}

app/proxyman/inbound/dynamic.go

@@ -156,6 +156,7 @@ func (h *DynamicInboundHandler) refresh() error {
 				uplinkCounter:   uplinkCounter,
 				downlinkCounter: downlinkCounter,
 				stream:          h.streamSettings,
+				ctx:             h.ctx,
 			}
 			if err := worker.Start(); err != nil {
 				newError("failed to create UDP worker").Base(err).AtWarning().WriteToLog()

app/proxyman/inbound/worker.go

@@ -239,6 +239,9 @@ type udpWorker struct {
 
 	checker    *task.Periodic
 	activeConn map[connID]*udpConn
+
+	ctx  context.Context
+	cone bool
 }
 
 func (w *udpWorker) getConnection(id connID) (*udpConn, bool) {
@@ -279,7 +282,10 @@ func (w *udpWorker) callback(b *buf.Buffer, source net.Destination, originalDest
 		src: source,
 	}
 	if originalDest.IsValid() {
-		id.dest = originalDest
+		if !w.cone {
+			id.dest = originalDest
+		}
+		b.UDP = &originalDest
 	}
 	conn, existing := w.getConnection(id)
 
@@ -336,7 +342,7 @@ func (w *udpWorker) clean() error {
 	}
 
 	for addr, conn := range w.activeConn {
-		if nowSec-atomic.LoadInt64(&conn.lastActivityTime) > 8 { // TODO Timeout too small
+		if nowSec-atomic.LoadInt64(&conn.lastActivityTime) > 300 {
 			delete(w.activeConn, addr)
 			conn.Close()
 		}
@@ -357,8 +363,10 @@ func (w *udpWorker) Start() error {
 		return err
 	}
 
+	w.cone = w.ctx.Value("cone").(bool)
+
 	w.checker = &task.Periodic{
-		Interval: time.Second * 16,
+		Interval: time.Minute,
 		Execute:  w.clean,
 	}
 

app/proxyman/outbound/handler.go

@@ -7,6 +7,7 @@ import (
 	"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/core"
 	"github.com/xtls/xray-core/features/outbound"
@@ -173,7 +174,7 @@ func (h *Handler) Dial(ctx context.Context, dest net.Destination) (internet.Conn
 				downlinkReader, downlinkWriter := pipe.New(opts...)
 
 				go handler.Dispatch(ctx, &transport.Link{Reader: uplinkReader, Writer: downlinkWriter})
-				conn := net.NewConnection(net.ConnectionInputMulti(uplinkWriter), net.ConnectionOutputMulti(downlinkReader))
+				conn := cnc.NewConnection(cnc.ConnectionInputMulti(uplinkWriter), cnc.ConnectionOutputMulti(downlinkReader))
 
 				if config := tls.ConfigFromStreamSettings(h.streamSettings); config != nil {
 					tlsConfig := config.GetTLSConfig(tls.WithDestination(dest))

common/buf/buffer.go

@@ -2,9 +2,9 @@ package buf
 
 import (
 	"io"
-	"net"
 
 	"github.com/xtls/xray-core/common/bytespool"
+	"github.com/xtls/xray-core/common/net"
 )
 
 const (
@@ -21,7 +21,7 @@ type Buffer struct {
 	v     []byte
 	start int32
 	end   int32
-	UDP   *net.UDPAddr
+	UDP   *net.Destination
 }
 
 // New creates a Buffer with 0 length and 2K capacity.
@@ -49,6 +49,7 @@ func (b *Buffer) Release() {
 	b.v = nil
 	b.Clear()
 	pool.Put(p)
+	b.UDP = nil
 }
 
 // Clear clears the content of the buffer, results an empty buffer with

common/net/cnc/connection.go

@@ -1,12 +1,12 @@
-package net
+package cnc
 
 import (
 	"io"
-	"net"
 	"time"
 
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
+	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/signal/done"
 )
 
@@ -88,8 +88,8 @@ type connection struct {
 	writer  buf.Writer
 	done    *done.Instance
 	onClose io.Closer
-	local   Addr
+	local   net.Addr
-	remote  Addr
+	remote  net.Addr
 }
 
 func (c *connection) Read(b []byte) (int, error) {

core/core.go

@@ -18,7 +18,7 @@ import (
 )
 
 var (
-	version  = "1.1.5"
+	version  = "1.2.1"
 	build    = "Custom"
 	codename = "Xray, Penetrates Everything."
 	intro    = "A unified platform for anti-censorship."

core/functions.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/transport/internet/udp"
 )
@@ -53,13 +54,13 @@ func Dial(ctx context.Context, v *Instance, dest net.Destination) (net.Conn, err
 	if err != nil {
 		return nil, err
 	}
-	var readerOpt net.ConnectionOption
+	var readerOpt cnc.ConnectionOption
 	if dest.Network == net.Network_TCP {
-		readerOpt = net.ConnectionOutputMulti(r.Reader)
+		readerOpt = cnc.ConnectionOutputMulti(r.Reader)
 	} else {
-		readerOpt = net.ConnectionOutputMultiUDP(r.Reader)
+		readerOpt = cnc.ConnectionOutputMultiUDP(r.Reader)
 	}
-	return net.NewConnection(net.ConnectionInputMulti(r.Writer), readerOpt), nil
+	return cnc.NewConnection(cnc.ConnectionInputMulti(r.Writer), readerOpt), nil
 }
 
 // DialUDP provides a way to exchange UDP packets through Xray instance to remote servers.

core/xray.go

@@ -3,8 +3,13 @@ package core
 import (
 	"context"
 	"reflect"
+	"runtime/debug"
+	"strings"
 	"sync"
 
+	"github.com/golang/protobuf/proto"
+
+	"github.com/xtls/xray-core/app/proxyman"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/serial"
 	"github.com/xtls/xray-core/features"
@@ -179,6 +184,31 @@ func NewWithContext(ctx context.Context, config *Config) (*Instance, error) {
 }
 
 func initInstanceWithConfig(config *Config, server *Instance) (bool, error) {
+	cone := true
+	v, t := false, false
+	for _, outbound := range config.Outbound {
+		s := strings.ToLower(outbound.ProxySettings.Type)
+		l := len(s)
+		if l >= 16 && s[11:16] == "vless" || l >= 16 && s[11:16] == "vmess" {
+			v = true
+			continue
+		}
+		if l >= 17 && s[11:17] == "trojan" || l >= 22 && s[11:22] == "shadowsocks" {
+			t = true
+			var m proxyman.SenderConfig
+			proto.Unmarshal(outbound.SenderSettings.Value, &m)
+			if m.MultiplexSettings != nil && m.MultiplexSettings.Enabled {
+				cone = false
+				break
+			}
+		}
+	}
+	if v && !t {
+		cone = false
+	}
+	server.ctx = context.WithValue(server.ctx, "cone", cone)
+	defer debug.FreeOSMemory()
+
 	if config.Transport != nil {
 		features.PrintDeprecatedFeatureWarning("global transport settings")
 	}

go.mod

@@ -3,7 +3,6 @@ module github.com/xtls/xray-core
 go 1.15
 
 require (
-	github.com/BurntSushi/toml v0.3.1
 	github.com/ghodss/yaml v1.0.1-0.20190212211648-25d852aebe32
 	github.com/golang/mock v1.4.4
 	github.com/golang/protobuf v1.4.3
@@ -11,6 +10,7 @@ require (
 	github.com/gorilla/websocket v1.4.2
 	github.com/lucas-clemente/quic-go v0.19.3
 	github.com/miekg/dns v1.1.35
+	github.com/pelletier/go-toml v1.8.1
 	github.com/pires/go-proxyproto v0.3.3
 	github.com/seiflotfy/cuckoofilter v0.0.0-20201222105146-bc6005554a0c
 	github.com/stretchr/testify v1.6.1
@@ -19,7 +19,7 @@ require (
 	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
 	golang.org/x/net v0.0.0-20201224014010-6772e930b67b
 	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
-	golang.org/x/sys v0.0.0-20201223074533-0d417f636930
+	golang.org/x/sys v0.0.0-20210110051926-789bb1bd4061
 	google.golang.org/grpc v1.34.0
 	google.golang.org/protobuf v1.25.0
 	h12.io/socks v1.0.2

go.sum

@@ -7,7 +7,6 @@ dmitri.shuralyov.com/html/belt v0.0.0-20180602232347-f7d459c86be0/go.mod h1:JLBr
 dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1:a1inKt/atXimZ4Mv927x+r7UpyzRUf4emIoiiSC2TN4=
 dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU=
 git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
-github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
@@ -124,6 +123,8 @@ github.com/onsi/gomega v1.7.1/go.mod h1:XdKZgCCFLUoM/7CFJVPcG8C1xQ1AJ0vpAezJrB7J
 github.com/onsi/gomega v1.10.1 h1:o0+MgICZLuZ7xjH7Vx6zS/zcu93/BEp1VwkIW1mEXCE=
 github.com/onsi/gomega v1.10.1/go.mod h1:iN09h71vgCQne3DLsj+A5owkum+a2tYe+TOCB1ybHNo=
 github.com/openzipkin/zipkin-go v0.1.1/go.mod h1:NtoC/o8u3JlF1lSlyPNswIbeQH9bJTmOf0Erfk+hxe8=
+github.com/pelletier/go-toml v1.8.1 h1:1Nf83orprkJyknT6h7zbuEGUEjcyVlCxSUGTENmNCRM=
+github.com/pelletier/go-toml v1.8.1/go.mod h1:T2/BmBdy8dvIRq1a/8aqjN41wvWlN4lrapLU/GW4pbc=
 github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2 h1:JhzVVoYvbOACxoUmOs6V/G4D5nPVUW73rKvXxP4XUJc=
 github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2/go.mod h1:iIss55rKnNBTvrwdmkUpLnDpZoAHvWaiq5+iMmen4AE=
 github.com/pires/go-proxyproto v0.3.3 h1:jOXGrsAfSQVFiD1hWg1aiHpLYsd6SJw/8cLN594sB7Q=
@@ -241,8 +242,8 @@ golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200519105757-fe76b779f299/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200803210538-64077c9b5642/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20201223074533-0d417f636930 h1:vRgIt+nup/B/BwIS0g2oC0haq0iqbV3ZA+u6+0TlNCo=
+golang.org/x/sys v0.0.0-20210110051926-789bb1bd4061 h1:DQmQoKxQWtyybCtX/3dIuDBcAhFszqq8YiNeS6sNu1c=
-golang.org/x/sys v0.0.0-20201223074533-0d417f636930/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210110051926-789bb1bd4061/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=

infra/conf/serial/loader.go

@@ -6,8 +6,8 @@ import (
 	"io"
 	"io/ioutil"
 
-	"github.com/BurntSushi/toml"
 	"github.com/ghodss/yaml"
+	"github.com/pelletier/go-toml"
 
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/core"
@@ -86,7 +86,7 @@ func LoadJSONConfig(reader io.Reader) (*core.Config, error) {
 }
 
 // DecodeTOMLConfig reads from reader and decode the config into *conf.Config
-// using github.com/BurntSushi/toml and map to convert toml to json.
+// using github.com/pelletier/go-toml and map to convert toml to json.
 func DecodeTOMLConfig(reader io.Reader) (*conf.Config, error) {
 	tomlFile, err := ioutil.ReadAll(reader)
 	if err != nil {
@@ -94,7 +94,7 @@ func DecodeTOMLConfig(reader io.Reader) (*conf.Config, error) {
 	}
 
 	configMap := make(map[string]interface{})
-	if _, err := toml.Decode(string(tomlFile), &configMap); err != nil {
+	if err := toml.Unmarshal(tomlFile, &configMap); err != nil {
 		return nil, newError("failed to convert toml to map").Base(err)
 	}
 

infra/conf/transport_internet.go

@@ -294,7 +294,7 @@ type TLSConfig struct {
 	Certs                    []*TLSCertConfig `json:"certificates"`
 	ServerName               string           `json:"serverName"`
 	ALPN                     *StringList      `json:"alpn"`
-	DisableSessionResumption bool             `json:"disableSessionResumption"`
+	EnableSessionResumption  bool             `json:"enableSessionResumption"`
 	DisableSystemRoot        bool             `json:"disableSystemRoot"`
 	MinVersion               string           `json:"minVersion"`
 	MaxVersion               string           `json:"maxVersion"`
@@ -321,7 +321,7 @@ func (c *TLSConfig) Build() (proto.Message, error) {
 	if c.ALPN != nil && len(*c.ALPN) > 0 {
 		config.NextProtocol = []string(*c.ALPN)
 	}
-	config.DisableSessionResumption = c.DisableSessionResumption
+	config.EnableSessionResumption = c.EnableSessionResumption
 	config.DisableSystemRoot = c.DisableSystemRoot
 	config.MinVersion = c.MinVersion
 	config.MaxVersion = c.MaxVersion
@@ -378,7 +378,7 @@ type XTLSConfig struct {
 	Certs                    []*XTLSCertConfig `json:"certificates"`
 	ServerName               string            `json:"serverName"`
 	ALPN                     *StringList       `json:"alpn"`
-	DisableSessionResumption bool              `json:"disableSessionResumption"`
+	EnableSessionResumption  bool              `json:"enableSessionResumption"`
 	DisableSystemRoot        bool              `json:"disableSystemRoot"`
 	MinVersion               string            `json:"minVersion"`
 	MaxVersion               string            `json:"maxVersion"`
@@ -405,7 +405,7 @@ func (c *XTLSConfig) Build() (proto.Message, error) {
 	if c.ALPN != nil && len(*c.ALPN) > 0 {
 		config.NextProtocol = []string(*c.ALPN)
 	}
-	config.DisableSessionResumption = c.DisableSessionResumption
+	config.EnableSessionResumption = c.EnableSessionResumption
 	config.DisableSystemRoot = c.DisableSystemRoot
 	config.MinVersion = c.MinVersion
 	config.MaxVersion = c.MaxVersion

main/run.go

@@ -8,6 +8,7 @@ import (
 	"os/signal"
 	"path"
 	"path/filepath"
+	"regexp"
 	"runtime"
 	"runtime/debug"
 	"strings"
@@ -116,7 +117,11 @@ func readConfDir(dirPath string) {
 		log.Fatalln(err)
 	}
 	for _, f := range confs {
-		if strings.HasSuffix(f.Name(), ".json") {
+		matched, err := regexp.MatchString(`^.+\.(json|toml|yaml|yml)$`, f.Name())
+		if err != nil {
+			log.Fatalln(err)
+		}
+		if matched {
 			configFiles.Set(path.Join(dirPath, f.Name()))
 		}
 	}

proxy/dokodemo/dokodemo.go

@@ -163,36 +163,60 @@ func (d *DokodemoDoor) Process(ctx context.Context, network net.Network, conn in
 		if !destinationOverridden {
 			writer = &buf.SequentialWriter{Writer: conn}
 		} else {
-			sockopt := &internet.SocketConfig{
+			back := conn.RemoteAddr().(*net.UDPAddr)
-				Tproxy: internet.SocketConfig_TProxy,
+			if !dest.Address.Family().IsIP() {
+				if len(back.IP) == 4 {
+					dest.Address = net.AnyIP
+				} else {
+					dest.Address = net.AnyIPv6
+				}
 			}
-			if dest.Address.Family().IsIP() {
+			addr := &net.UDPAddr{
-				sockopt.BindAddress = dest.Address.IP()
+				IP:   dest.Address.IP(),
-				sockopt.BindPort = uint32(dest.Port)
+				Port: int(dest.Port),
 			}
+			var mark int
 			if d.sockopt != nil {
-				sockopt.Mark = d.sockopt.Mark
+				mark = int(d.sockopt.Mark)
 			}
-			tConn, err := internet.DialSystem(ctx, net.DestinationFromAddr(conn.RemoteAddr()), sockopt)
+			pConn, err := FakeUDP(addr, mark)
 			if err != nil {
 				return err
 			}
-			defer tConn.Close()
+			writer = NewPacketWriter(pConn, &dest, mark, back)
-
+			defer writer.(*PacketWriter).Close()
-			writer = &buf.SequentialWriter{Writer: tConn}
+			/*
-			tReader := buf.NewPacketReader(tConn)
+				sockopt := &internet.SocketConfig{
-			requestCount++
+					Tproxy: internet.SocketConfig_TProxy,
-			tproxyRequest = func() error {
-				defer func() {
-					if atomic.AddInt32(&requestCount, -1) == 0 {
-						timer.SetTimeout(plcy.Timeouts.DownlinkOnly)
-					}
-				}()
-				if err := buf.Copy(tReader, link.Writer, buf.UpdateActivity(timer)); err != nil {
-					return newError("failed to transport request (TPROXY conn)").Base(err)
 				}
-				return nil
+				if dest.Address.Family().IsIP() {
-			}
+					sockopt.BindAddress = dest.Address.IP()
+					sockopt.BindPort = uint32(dest.Port)
+				}
+				if d.sockopt != nil {
+					sockopt.Mark = d.sockopt.Mark
+				}
+				tConn, err := internet.DialSystem(ctx, net.DestinationFromAddr(conn.RemoteAddr()), sockopt)
+				if err != nil {
+					return err
+				}
+				defer tConn.Close()
+
+				writer = &buf.SequentialWriter{Writer: tConn}
+				tReader := buf.NewPacketReader(tConn)
+				requestCount++
+				tproxyRequest = func() error {
+					defer func() {
+						if atomic.AddInt32(&requestCount, -1) == 0 {
+							timer.SetTimeout(plcy.Timeouts.DownlinkOnly)
+						}
+					}()
+					if err := buf.Copy(tReader, link.Writer, buf.UpdateActivity(timer)); err != nil {
+						return newError("failed to transport request (TPROXY conn)").Base(err)
+					}
+					return nil
+				}
+			*/
 		}
 	}
 
@@ -215,3 +239,74 @@ func (d *DokodemoDoor) Process(ctx context.Context, network net.Network, conn in
 
 	return nil
 }
+
+func NewPacketWriter(conn net.PacketConn, d *net.Destination, mark int, back *net.UDPAddr) buf.Writer {
+	writer := &PacketWriter{
+		conn:  conn,
+		conns: make(map[net.Destination]net.PacketConn),
+		mark:  mark,
+		back:  back,
+	}
+	writer.conns[*d] = conn
+	return writer
+}
+
+type PacketWriter struct {
+	conn  net.PacketConn
+	conns map[net.Destination]net.PacketConn
+	mark  int
+	back  *net.UDPAddr
+}
+
+func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
+	for {
+		mb2, b := buf.SplitFirst(mb)
+		mb = mb2
+		if b == nil {
+			break
+		}
+		var err error
+		if b.UDP != nil && b.UDP.Address.Family().IsIP() {
+			conn := w.conns[*b.UDP]
+			if conn == nil {
+				conn, err = FakeUDP(
+					&net.UDPAddr{
+						IP:   b.UDP.Address.IP(),
+						Port: int(b.UDP.Port),
+					},
+					w.mark,
+				)
+				if err != nil {
+					b.Release()
+					buf.ReleaseMulti(mb)
+					return err
+				}
+				w.conns[*b.UDP] = conn
+			}
+			_, err = conn.WriteTo(b.Bytes(), w.back)
+			if err != nil {
+				conn.Close()
+				w.conns[*b.UDP] = nil
+				newError(err).WriteToLog()
+			}
+			b.Release()
+		} else {
+			_, err = w.conn.WriteTo(b.Bytes(), w.back)
+			b.Release()
+			if err != nil {
+				buf.ReleaseMulti(mb)
+				return err
+			}
+		}
+	}
+	return nil
+}
+
+func (w *PacketWriter) Close() error {
+	for _, conn := range w.conns {
+		if conn != nil {
+			conn.Close()
+		}
+	}
+	return nil
+}

proxy/dokodemo/fakeudp_linux.go

@@ -0,0 +1,72 @@
+// +build linux
+
+package dokodemo
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"syscall"
+)
+
+func FakeUDP(addr *net.UDPAddr, mark int) (net.PacketConn, error) {
+
+	localSocketAddress, af, err := udpAddrToSocketAddr(addr)
+	if err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("build local socket address: %s", err)}
+	}
+
+	fileDescriptor, err := syscall.Socket(af, syscall.SOCK_DGRAM, 0)
+	if err != nil {
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("socket open: %s", err)}
+	}
+
+	if mark != 0 {
+		if err = syscall.SetsockoptInt(fileDescriptor, syscall.SOL_SOCKET, syscall.SO_MARK, mark); err != nil {
+			syscall.Close(fileDescriptor)
+			return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option: SO_MARK: %s", err)}
+		}
+	}
+
+	if err = syscall.SetsockoptInt(fileDescriptor, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
+		syscall.Close(fileDescriptor)
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option: SO_REUSEADDR: %s", err)}
+	}
+
+	if err = syscall.SetsockoptInt(fileDescriptor, syscall.SOL_IP, syscall.IP_TRANSPARENT, 1); err != nil {
+		syscall.Close(fileDescriptor)
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("set socket option: IP_TRANSPARENT: %s", err)}
+	}
+
+	if err = syscall.Bind(fileDescriptor, localSocketAddress); err != nil {
+		syscall.Close(fileDescriptor)
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("socket bind: %s", err)}
+	}
+
+	fdFile := os.NewFile(uintptr(fileDescriptor), fmt.Sprintf("net-udp-fake-%s", addr.String()))
+	defer fdFile.Close()
+
+	packetConn, err := net.FilePacketConn(fdFile)
+	if err != nil {
+		syscall.Close(fileDescriptor)
+		return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("convert file descriptor to connection: %s", err)}
+	}
+
+	return packetConn, nil
+}
+
+func udpAddrToSocketAddr(addr *net.UDPAddr) (syscall.Sockaddr, int, error) {
+	switch {
+	case addr.IP.To4() != nil:
+		ip := [4]byte{}
+		copy(ip[:], addr.IP.To4())
+
+		return &syscall.SockaddrInet4{Addr: ip, Port: addr.Port}, syscall.AF_INET, nil
+
+	default:
+		ip := [16]byte{}
+		copy(ip[:], addr.IP.To16())
+
+		return &syscall.SockaddrInet6{Addr: ip, Port: addr.Port, ZoneId: 0}, syscall.AF_INET6, nil
+	}
+}

proxy/dokodemo/fakeudp_other.go

@@ -0,0 +1,12 @@
+// +build !linux
+
+package dokodemo
+
+import (
+	"fmt"
+	"net"
+)
+
+func FakeUDP(addr *net.UDPAddr, mark int) (net.PacketConn, error) {
+	return nil, &net.OpError{Op: "fake", Err: fmt.Errorf("!linux")}
+}

proxy/freedom/freedom.go

@@ -149,7 +149,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		if destination.Network == net.Network_TCP {
 			writer = buf.NewWriter(conn)
 		} else {
-			writer = NewPacketWriter(conn)
+			writer = NewPacketWriter(conn, h, ctx)
 		}
 
 		if err := buf.Copy(input, writer, buf.UpdateActivity(timer)); err != nil {
@@ -215,14 +215,18 @@ func (r *PacketReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 		return nil, err
 	}
 	b.Resize(0, int32(n))
-	b.UDP = d.(*net.UDPAddr)
+	b.UDP = &net.Destination{
+		Address: net.IPAddress(d.(*net.UDPAddr).IP),
+		Port:    net.Port(d.(*net.UDPAddr).Port),
+		Network: net.Network_UDP,
+	}
 	if r.Counter != nil {
 		r.Counter.Add(int64(n))
 	}
 	return buf.MultiBuffer{b}, nil
 }
 
-func NewPacketWriter(conn net.Conn) buf.Writer {
+func NewPacketWriter(conn net.Conn, h *Handler, ctx context.Context) buf.Writer {
 	iConn := conn
 	statConn, ok := iConn.(*internet.StatCouterConnection)
 	if ok {
@@ -236,6 +240,8 @@ func NewPacketWriter(conn net.Conn) buf.Writer {
 		return &PacketWriter{
 			PacketConnWrapper: c,
 			Counter:           counter,
+			Handler:           h,
+			Context:           ctx,
 		}
 	}
 	return &buf.SequentialWriter{Writer: conn}
@@ -244,6 +250,8 @@ func NewPacketWriter(conn net.Conn) buf.Writer {
 type PacketWriter struct {
 	*internet.PacketConnWrapper
 	stats.Counter
+	*Handler
+	context.Context
 }
 
 func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
@@ -256,7 +264,18 @@ func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 		var n int
 		var err error
 		if b.UDP != nil {
-			n, err = w.PacketConnWrapper.WriteTo(b.Bytes(), b.UDP)
+			if w.Handler.config.useIP() && b.UDP.Address.Family().IsDomain() {
+				ip := w.Handler.resolveIP(w.Context, b.UDP.Address.Domain(), nil)
+				if ip != nil {
+					b.UDP.Address = ip
+				}
+			}
+			destAddr, _ := net.ResolveUDPAddr("udp", b.UDP.NetAddr())
+			if destAddr == nil {
+				b.Release()
+				continue
+			}
+			n, err = w.PacketConnWrapper.WriteTo(b.Bytes(), destAddr)
 		} else {
 			n, err = w.PacketConnWrapper.Write(b.Bytes())
 		}

proxy/shadowsocks/protocol.go

@@ -235,10 +235,8 @@ func (v *UDPReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 		buffer.Release()
 		return nil, err
 	}
-	payload.UDP = &net.UDPAddr{
+	dest := u.Destination()
-		IP:   u.Address.IP(),
+	payload.UDP = &dest
-		Port: int(u.Port),
-	}
 	return buf.MultiBuffer{payload}, nil
 }
 
@@ -254,18 +252,15 @@ func (w *UDPWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 		if b == nil {
 			break
 		}
-		var packet *buf.Buffer
+		request := w.Request
-		var err error
 		if b.UDP != nil {
-			request := &protocol.RequestHeader{
+			request = &protocol.RequestHeader{
 				User:    w.Request.User,
-				Address: net.IPAddress(b.UDP.IP),
+				Address: b.UDP.Address,
-				Port:    net.Port(b.UDP.Port),
+				Port:    b.UDP.Port,
 			}
-			packet, err = EncodeUDPPacket(request, b.Bytes())
-		} else {
-			packet, err = EncodeUDPPacket(w.Request, b.Bytes())
 		}
+		packet, err := EncodeUDPPacket(request, b.Bytes())
 		b.Release()
 		if err != nil {
 			buf.ReleaseMulti(mb)

proxy/shadowsocks/server.go

@@ -24,6 +24,7 @@ type Server struct {
 	config        *ServerConfig
 	user          *protocol.MemoryUser
 	policyManager policy.Manager
+	cone          bool
 }
 
 // NewServer create a new Shadowsocks server.
@@ -42,6 +43,7 @@ func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
 		config:        config,
 		user:          mUser,
 		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
+		cone:          ctx.Value("cone").(bool),
 	}
 
 	return s, nil
@@ -81,8 +83,8 @@ func (s *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection
 		if payload.UDP != nil {
 			request = &protocol.RequestHeader{
 				User:    request.User,
-				Address: net.IPAddress(payload.UDP.IP),
+				Address: payload.UDP.Address,
-				Port:    net.Port(payload.UDP.Port),
+				Port:    payload.UDP.Port,
 			}
 		}
 
@@ -103,7 +105,7 @@ func (s *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection
 	}
 	inbound.User = s.user
 
-	var dest net.Destination
+	var dest *net.Destination
 
 	reader := buf.NewPacketReader(conn)
 	for {
@@ -128,29 +130,28 @@ func (s *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection
 				continue
 			}
 
+			destination := request.Destination()
+
 			currentPacketCtx := ctx
 			if inbound.Source.IsValid() {
 				currentPacketCtx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
 					From:   inbound.Source,
-					To:     request.Destination(),
+					To:     destination,
 					Status: log.AccessAccepted,
 					Reason: "",
 					Email:  request.User.Email,
 				})
 			}
-			newError("tunnelling request to ", request.Destination()).WriteToLog(session.ExportIDToError(currentPacketCtx))
+			newError("tunnelling request to ", destination).WriteToLog(session.ExportIDToError(currentPacketCtx))
 
-			data.UDP = &net.UDPAddr{
+			data.UDP = &destination
-				IP:   request.Address.IP(),
-				Port: int(request.Port),
-			}
 
-			if dest.Network == 0 {
+			if !s.cone || dest == nil {
-				dest = request.Destination() // JUST FOLLOW THE FIREST PACKET
+				dest = &destination
 			}
 
 			currentPacketCtx = protocol.ContextWithRequestHeader(currentPacketCtx, request)
-			udpServer.Dispatch(currentPacketCtx, dest, data)
+			udpServer.Dispatch(currentPacketCtx, *dest, data)
 		}
 	}
 

proxy/socks/client.go

@@ -138,11 +138,12 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 		defer udpConn.Close()
 		requestFunc = func() error {
 			defer timer.SetTimeout(p.Timeouts.DownlinkOnly)
-			return buf.Copy(link.Reader, &buf.SequentialWriter{Writer: NewUDPWriter(request, udpConn)}, buf.UpdateActivity(timer))
+			writer := &UDPWriter{Writer: udpConn, Request: request}
+			return buf.Copy(link.Reader, writer, buf.UpdateActivity(timer))
 		}
 		responseFunc = func() error {
 			defer timer.SetTimeout(p.Timeouts.UplinkOnly)
-			reader := &UDPReader{reader: udpConn}
+			reader := &UDPReader{Reader: udpConn}
 			return buf.Copy(reader, link.Writer, buf.UpdateActivity(timer))
 		}
 	}

proxy/socks/protocol.go

@@ -39,10 +39,10 @@ var addrParser = protocol.NewAddressParser(
 )
 
 type ServerSession struct {
-	config        *ServerConfig
+	config       *ServerConfig
-	address       net.Address
+	address      net.Address
-	port          net.Port
+	port         net.Port
-	clientAddress net.Address
+	localAddress net.Address
 }
 
 func (s *ServerSession) handshake4(cmd byte, reader io.Reader, writer io.Writer) (*protocol.RequestHeader, error) {
@@ -192,14 +192,11 @@ func (s *ServerSession) handshake5(nMethod byte, reader io.Reader, writer io.Wri
 	//nolint:gocritic // Use if else chain for clarity
 	if request.Command == protocol.RequestCommandUDP {
 		if s.config.Address != nil {
-			// Use configured IP as remote address in the response to UdpAssociate
+			// Use configured IP as remote address in the response to UDP Associate
 			responseAddress = s.config.Address.AsAddress()
-		} else if s.clientAddress == net.LocalHostIP || s.clientAddress == net.LocalHostIPv6 {
-			// For localhost clients use loopback IP
-			responseAddress = s.clientAddress
 		} else {
-			// For non-localhost clients use inbound listening address
+			// Use conn.LocalAddr() IP as remote address in the response by default
-			responseAddress = s.address
+			responseAddress = s.localAddress
 		}
 	}
 	if err := writeSocks5Response(writer, statusSuccess, responseAddress, responsePort); err != nil {
@@ -360,47 +357,59 @@ func EncodeUDPPacket(request *protocol.RequestHeader, data []byte) (*buf.Buffer,
 }
 
 type UDPReader struct {
-	reader io.Reader
+	Reader io.Reader
-}
-
-func NewUDPReader(reader io.Reader) *UDPReader {
-	return &UDPReader{reader: reader}
 }
 
 func (r *UDPReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
-	b := buf.New()
+	buffer := buf.New()
-	if _, err := b.ReadFrom(r.reader); err != nil {
+	_, err := buffer.ReadFrom(r.Reader)
+	if err != nil {
+		buffer.Release()
 		return nil, err
 	}
-	if _, err := DecodeUDPPacket(b); err != nil {
+	u, err := DecodeUDPPacket(buffer)
+	if err != nil {
+		buffer.Release()
 		return nil, err
 	}
-	return buf.MultiBuffer{b}, nil
+	dest := u.Destination()
+	buffer.UDP = &dest
+	return buf.MultiBuffer{buffer}, nil
 }
 
 type UDPWriter struct {
-	request *protocol.RequestHeader
+	Writer  io.Writer
-	writer  io.Writer
+	Request *protocol.RequestHeader
 }
 
-func NewUDPWriter(request *protocol.RequestHeader, writer io.Writer) *UDPWriter {
+func (w *UDPWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
-	return &UDPWriter{
+	for {
-		request: request,
+		mb2, b := buf.SplitFirst(mb)
-		writer:  writer,
+		mb = mb2
+		if b == nil {
+			break
+		}
+		request := w.Request
+		if b.UDP != nil {
+			request = &protocol.RequestHeader{
+				Address: b.UDP.Address,
+				Port:    b.UDP.Port,
+			}
+		}
+		packet, err := EncodeUDPPacket(request, b.Bytes())
+		b.Release()
+		if err != nil {
+			buf.ReleaseMulti(mb)
+			return err
+		}
+		_, err = w.Writer.Write(packet.Bytes())
+		packet.Release()
+		if err != nil {
+			buf.ReleaseMulti(mb)
+			return err
+		}
 	}
-}
+	return nil
-
-// Write implements io.Writer.
-func (w *UDPWriter) Write(b []byte) (int, error) {
-	eb, err := EncodeUDPPacket(w.request, b)
-	if err != nil {
-		return 0, err
-	}
-	defer eb.Release()
-	if _, err := w.writer.Write(eb.Bytes()); err != nil {
-		return 0, err
-	}
-	return len(b), nil
 }
 
 func ClientHandshake(request *protocol.RequestHeader, reader io.Reader, writer io.Writer) (*protocol.RequestHeader, error) {

proxy/socks/protocol_test.go

@@ -20,14 +20,14 @@ func TestUDPEncoding(t *testing.T) {
 		Address: net.IPAddress([]byte{1, 2, 3, 4, 5, 6, 7, 8, 9, 0, 1, 2, 3, 4, 5, 6}),
 		Port:    1024,
 	}
-	writer := &buf.SequentialWriter{Writer: NewUDPWriter(request, b)}
+	writer := &UDPWriter{Writer: b, Request: request}
 
 	content := []byte{'a'}
 	payload := buf.New()
 	payload.Write(content)
 	common.Must(writer.WriteMultiBuffer(buf.MultiBuffer{payload}))
 
-	reader := NewUDPReader(b)
+	reader := &UDPReader{Reader: b}
 
 	decodedPayload, err := reader.ReadMultiBuffer()
 	common.Must(err)

proxy/socks/server.go

@@ -26,6 +26,7 @@ import (
 type Server struct {
 	config        *ServerConfig
 	policyManager policy.Manager
+	cone          bool
 }
 
 // NewServer creates a new Server object.
@@ -34,6 +35,7 @@ func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
 	s := &Server{
 		config:        config,
 		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
+		cone:          ctx.Value("cone").(bool),
 	}
 	return s, nil
 }
@@ -89,10 +91,10 @@ func (s *Server) processTCP(ctx context.Context, conn internet.Connection, dispa
 	}
 
 	svrSession := &ServerSession{
-		config:        s.config,
+		config:       s.config,
-		address:       inbound.Gateway.Address,
+		address:      inbound.Gateway.Address,
-		port:          inbound.Gateway.Port,
+		port:         inbound.Gateway.Port,
-		clientAddress: inbound.Source.Address,
+		localAddress: net.IPAddress(conn.LocalAddr().(*net.TCPAddr).IP),
 	}
 
 	reader := &buf.BufferedReader{Reader: buf.NewReader(conn)}
@@ -202,8 +204,8 @@ func (s *Server) handleUDPPayload(ctx context.Context, conn internet.Connection,
 		if payload.UDP != nil {
 			request = &protocol.RequestHeader{
 				User:    request.User,
-				Address: net.IPAddress(payload.UDP.IP),
+				Address: payload.UDP.Address,
-				Port:    net.Port(payload.UDP.Port),
+				Port:    payload.UDP.Port,
 			}
 		}
 
@@ -218,11 +220,12 @@ func (s *Server) handleUDPPayload(ctx context.Context, conn internet.Connection,
 		conn.Write(udpMessage.Bytes())
 	})
 
-	if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Source.IsValid() {
+	inbound := session.InboundFromContext(ctx)
+	if inbound != nil && inbound.Source.IsValid() {
 		newError("client UDP connection from ", inbound.Source).WriteToLog(session.ExportIDToError(ctx))
 	}
 
-	var dest net.Destination
+	var dest *net.Destination
 
 	reader := buf.NewPacketReader(conn)
 	for {
@@ -244,28 +247,28 @@ func (s *Server) handleUDPPayload(ctx context.Context, conn internet.Connection,
 				payload.Release()
 				continue
 			}
+
+			destination := request.Destination()
+
 			currentPacketCtx := ctx
-			newError("send packet to ", request.Destination(), " with ", payload.Len(), " bytes").AtDebug().WriteToLog(session.ExportIDToError(ctx))
+			newError("send packet to ", destination, " with ", payload.Len(), " bytes").AtDebug().WriteToLog(session.ExportIDToError(ctx))
-			if inbound := session.InboundFromContext(ctx); inbound != nil && inbound.Source.IsValid() {
+			if inbound != nil && inbound.Source.IsValid() {
 				currentPacketCtx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
 					From:   inbound.Source,
-					To:     request.Destination(),
+					To:     destination,
 					Status: log.AccessAccepted,
 					Reason: "",
 				})
 			}
 
-			payload.UDP = &net.UDPAddr{
+			payload.UDP = &destination
-				IP:   request.Address.IP(),
-				Port: int(request.Port),
-			}
 
-			if dest.Network == 0 {
+			if !s.cone || dest == nil {
-				dest = request.Destination() // JUST FOLLOW THE FIREST PACKET
+				dest = &destination
 			}
 
 			currentPacketCtx = protocol.ContextWithRequestHeader(currentPacketCtx, request)
-			udpServer.Dispatch(currentPacketCtx, dest, payload)
+			udpServer.Dispatch(currentPacketCtx, *dest, payload)
 		}
 	}
 }

proxy/trojan/client.go

@@ -7,6 +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/platform"
 	"github.com/xtls/xray-core/common/protocol"
@@ -145,12 +146,13 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 	postRequest := func() error {
 		defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
 
-		var bodyWriter buf.Writer
 		bufferWriter := buf.NewBufferedWriter(buf.NewWriter(conn))
+
 		connWriter.Writer = bufferWriter
 		connWriter.Target = destination
 		connWriter.Account = account
 
+		var bodyWriter buf.Writer
 		if destination.Network == net.Network_UDP {
 			bodyWriter = &PacketWriter{Writer: connWriter, Target: destination}
 		} else {
@@ -167,6 +169,11 @@ func (c *Client) Process(ctx context.Context, link *transport.Link, dialer inter
 			return newError("failed to flush payload").Base(err).AtWarning()
 		}
 
+		// Send header if not sent yet
+		if _, err = connWriter.Write([]byte{}); err != nil {
+			return err.(*errors.Error).AtWarning()
+		}
+
 		if err = buf.Copy(link.Reader, bodyWriter, buf.UpdateActivity(timer)); err != nil {
 			return newError("failed to transfer request payload").Base(err).AtInfo()
 		}

proxy/trojan/protocol.go

@@ -134,33 +134,11 @@ func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 		if b == nil {
 			break
 		}
-		target := w.Target
+		target := &w.Target
 		if b.UDP != nil {
-			target.Address = net.IPAddress(b.UDP.IP)
+			target = b.UDP
-			target.Port = net.Port(b.UDP.Port)
 		}
-		if _, err := w.writePacket(b.Bytes(), target); err != nil {
+		if _, err := w.writePacket(b.Bytes(), *target); err != nil {
-			buf.ReleaseMulti(mb)
-			return err
-		}
-	}
-	return nil
-}
-
-// WriteMultiBufferWithMetadata writes udp packet with destination specified
-func (w *PacketWriter) WriteMultiBufferWithMetadata(mb buf.MultiBuffer, dest net.Destination) error {
-	for {
-		mb2, b := buf.SplitFirst(mb)
-		mb = mb2
-		if b == nil {
-			break
-		}
-		source := dest
-		if b.UDP != nil {
-			source.Address = net.IPAddress(b.UDP.IP)
-			source.Port = net.Port(b.UDP.Port)
-		}
-		if _, err := w.writePacket(b.Bytes(), source); err != nil {
 			buf.ReleaseMulti(mb)
 			return err
 		}
@@ -261,12 +239,6 @@ func (c *ConnReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 	return buf.MultiBuffer{b}, err
 }
 
-// PacketPayload combines udp payload and destination
-type PacketPayload struct {
-	Target net.Destination
-	Buffer buf.MultiBuffer
-}
-
 // PacketReader is UDP Connection Reader Wrapper for trojan protocol
 type PacketReader struct {
 	io.Reader
@@ -274,15 +246,6 @@ type PacketReader struct {
 
 // ReadMultiBuffer implements buf.Reader
 func (r *PacketReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
-	p, err := r.ReadMultiBufferWithMetadata()
-	if p != nil {
-		return p.Buffer, err
-	}
-	return nil, err
-}
-
-// ReadMultiBufferWithMetadata reads udp packet with destination
-func (r *PacketReader) ReadMultiBufferWithMetadata() (*PacketPayload, error) {
 	addr, port, err := addrParser.ReadAddressPort(nil, r)
 	if err != nil {
 		return nil, newError("failed to read address and port").Base(err)
@@ -312,10 +275,7 @@ func (r *PacketReader) ReadMultiBufferWithMetadata() (*PacketPayload, error) {
 		}
 
 		b := buf.New()
-		b.UDP = &net.UDPAddr{
+		b.UDP = &dest
-			IP:   addr.IP(),
-			Port: int(port.Value()),
-		}
 		mb = append(mb, b)
 		n, err := b.ReadFullFrom(r, int32(length))
 		if err != nil {
@@ -326,7 +286,7 @@ func (r *PacketReader) ReadMultiBufferWithMetadata() (*PacketPayload, error) {
 		remain -= int(n)
 	}
 
-	return &PacketPayload{Target: dest, Buffer: mb}, nil
+	return mb, nil
 }
 
 func ReadV(reader buf.Reader, writer buf.Writer, timer signal.ActivityUpdater, conn *xtls.Conn, rawConn syscall.RawConn, counter stats.Counter, sctx context.Context) error {

proxy/trojan/protocol_test.go

@@ -71,21 +71,22 @@ func TestUDPRequest(t *testing.T) {
 	common.Must(connReader.ParseHeader())
 
 	packetReader := &PacketReader{Reader: connReader}
-	p, err := packetReader.ReadMultiBufferWithMetadata()
+	mb, err := packetReader.ReadMultiBuffer()
 	common.Must(err)
 
-	if p.Buffer.IsEmpty() {
+	if mb.IsEmpty() {
 		t.Error("no request data")
 	}
 
-	if r := cmp.Diff(p.Target, destination); r != "" {
+	mb2, b := buf.SplitFirst(mb)
+	defer buf.ReleaseMulti(mb2)
+
+	dest := *b.UDP
+	if r := cmp.Diff(dest, destination); r != "" {
 		t.Error("destination: ", r)
 	}
 
-	mb, decoded := buf.SplitFirst(p.Buffer)
+	if r := cmp.Diff(b.Bytes(), payload); r != "" {
-	buf.ReleaseMulti(mb)
-
-	if r := cmp.Diff(decoded.Bytes(), payload); r != "" {
 		t.Error("data: ", r)
 	}
 }

proxy/trojan/server.go

@@ -47,6 +47,7 @@ type Server struct {
 	policyManager policy.Manager
 	validator     *Validator
 	fallbacks     map[string]map[string]*Fallback // or nil
+	cone          bool
 }
 
 // NewServer creates a new trojan inbound handler.
@@ -67,6 +68,7 @@ func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
 	server := &Server{
 		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
 		validator:     validator,
+		cone:          ctx.Value("cone").(bool),
 	}
 
 	if config.Fallbacks != nil {
@@ -250,20 +252,24 @@ 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.NewDispatcher(dispatcher, func(ctx context.Context, packet *udp_proto.Packet) {
-		common.Must(clientWriter.WriteMultiBufferWithMetadata(buf.MultiBuffer{packet.Payload}, packet.Source))
+		udpPayload := packet.Payload
+		if udpPayload.UDP == nil {
+			udpPayload.UDP = &packet.Source
+		}
+		common.Must(clientWriter.WriteMultiBuffer(buf.MultiBuffer{udpPayload}))
 	})
 
 	inbound := session.InboundFromContext(ctx)
 	user := inbound.User
 
-	var dest net.Destination
+	var dest *net.Destination
 
 	for {
 		select {
 		case <-ctx.Done():
 			return nil
 		default:
-			p, err := clientReader.ReadMultiBufferWithMetadata()
+			mb, err := clientReader.ReadMultiBuffer()
 			if err != nil {
 				if errors.Cause(err) != io.EOF {
 					return newError("unexpected EOF").Base(err)
@@ -271,21 +277,31 @@ func (s *Server) handleUDPPayload(ctx context.Context, clientReader *PacketReade
 				return nil
 			}
 
-			ctx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
+			mb2, b := buf.SplitFirst(mb)
-				From:   inbound.Source,
+			if b == nil {
-				To:     p.Target,
+				continue
-				Status: log.AccessAccepted,
+			}
-				Reason: "",
+			destination := *b.UDP
-				Email:  user.Email,
-			})
-			newError("tunnelling request to ", p.Target).WriteToLog(session.ExportIDToError(ctx))
 
-			if dest.Network == 0 {
+			currentPacketCtx := ctx
-				dest = p.Target // JUST FOLLOW THE FIREST PACKET
+			if inbound.Source.IsValid() {
+				currentPacketCtx = log.ContextWithAccessMessage(ctx, &log.AccessMessage{
+					From:   inbound.Source,
+					To:     destination,
+					Status: log.AccessAccepted,
+					Reason: "",
+					Email:  user.Email,
+				})
+			}
+			newError("tunnelling request to ", destination).WriteToLog(session.ExportIDToError(ctx))
+
+			if !s.cone || dest == nil {
+				dest = &destination
 			}
 
-			for _, b := range p.Buffer {
+			udpServer.Dispatch(currentPacketCtx, *dest, b) // first packet
-				udpServer.Dispatch(ctx, dest, b)
+			for _, payload := range mb2 {
+				udpServer.Dispatch(currentPacketCtx, *dest, payload)
 			}
 		}
 	}

transport/internet/http/dialer.go

@@ -10,6 +10,7 @@ import (
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/transport/internet"
 	"github.com/xtls/xray-core/transport/internet/tls"
 	"github.com/xtls/xray-core/transport/pipe"
@@ -124,10 +125,10 @@ func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.Me
 
 	bwriter := buf.NewBufferedWriter(pwriter)
 	common.Must(bwriter.SetBuffered(false))
-	return net.NewConnection(
+	return cnc.NewConnection(
-		net.ConnectionOutput(response.Body),
+		cnc.ConnectionOutput(response.Body),
-		net.ConnectionInput(bwriter),
+		cnc.ConnectionInput(bwriter),
-		net.ConnectionOnClose(common.ChainedClosable{breader, bwriter, response.Body}),
+		cnc.ConnectionOnClose(common.ChainedClosable{breader, bwriter, response.Body}),
 	), nil
 }
 

transport/internet/http/hub.go

@@ -14,6 +14,7 @@ import (
 
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/net/cnc"
 	http_proto "github.com/xtls/xray-core/common/protocol/http"
 	"github.com/xtls/xray-core/common/serial"
 	"github.com/xtls/xray-core/common/session"
@@ -97,12 +98,12 @@ func (l *Listener) ServeHTTP(writer http.ResponseWriter, request *http.Request)
 	}
 
 	done := done.New()
-	conn := net.NewConnection(
+	conn := cnc.NewConnection(
-		net.ConnectionOutput(request.Body),
+		cnc.ConnectionOutput(request.Body),
-		net.ConnectionInput(flushWriter{w: writer, d: done}),
+		cnc.ConnectionInput(flushWriter{w: writer, d: done}),
-		net.ConnectionOnClose(common.ChainedClosable{done, request.Body}),
+		cnc.ConnectionOnClose(common.ChainedClosable{done, request.Body}),
-		net.ConnectionLocalAddr(l.Addr()),
+		cnc.ConnectionLocalAddr(l.Addr()),
-		net.ConnectionRemoteAddr(remoteAddr),
+		cnc.ConnectionRemoteAddr(remoteAddr),
 	)
 	l.handler(conn)
 	<-done.Wait()

transport/internet/tls/config.go

@@ -194,7 +194,7 @@ func (c *Config) GetTLSConfig(opts ...Option) *tls.Config {
 			RootCAs:                root,
 			InsecureSkipVerify:     false,
 			NextProtos:             nil,
-			SessionTicketsDisabled: false,
+			SessionTicketsDisabled: true,
 		}
 	}
 
@@ -203,7 +203,7 @@ func (c *Config) GetTLSConfig(opts ...Option) *tls.Config {
 		RootCAs:                root,
 		InsecureSkipVerify:     c.AllowInsecure,
 		NextProtos:             c.NextProtocol,
-		SessionTicketsDisabled: c.DisableSessionResumption,
+		SessionTicketsDisabled: !c.EnableSessionResumption,
 	}
 
 	for _, opt := range opts {

transport/internet/tls/config.pb.go

@@ -160,8 +160,8 @@ type Config struct {
 	ServerName string `protobuf:"bytes,3,opt,name=server_name,json=serverName,proto3" json:"server_name,omitempty"`
 	// Lists of string as ALPN values.
 	NextProtocol []string `protobuf:"bytes,4,rep,name=next_protocol,json=nextProtocol,proto3" json:"next_protocol,omitempty"`
-	// Whether or not to disable session (ticket) resumption.
+	// Whether or not to enable session (ticket) resumption.
-	DisableSessionResumption bool `protobuf:"varint,5,opt,name=disable_session_resumption,json=disableSessionResumption,proto3" json:"disable_session_resumption,omitempty"`
+	EnableSessionResumption bool `protobuf:"varint,5,opt,name=enable_session_resumption,json=enableSessionResumption,proto3" json:"enable_session_resumption,omitempty"`
 	// If true, root certificates on the system will not be loaded for
 	// verification.
 	DisableSystemRoot bool `protobuf:"varint,6,opt,name=disable_system_root,json=disableSystemRoot,proto3" json:"disable_system_root,omitempty"`
@@ -235,9 +235,9 @@ func (x *Config) GetNextProtocol() []string {
 	return nil
 }
 
-func (x *Config) GetDisableSessionResumption() bool {
+func (x *Config) GetEnableSessionResumption() bool {
 	if x != nil {
-		return x.DisableSessionResumption
+		return x.EnableSessionResumption
 	}
 	return false
 }
@@ -299,7 +299,7 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
 	0x43, 0x49, 0x50, 0x48, 0x45, 0x52, 0x4d, 0x45, 0x4e, 0x54, 0x10, 0x00, 0x12, 0x14, 0x0a, 0x10,
 	0x41, 0x55, 0x54, 0x48, 0x4f, 0x52, 0x49, 0x54, 0x59, 0x5f, 0x56, 0x45, 0x52, 0x49, 0x46, 0x59,
 	0x10, 0x01, 0x12, 0x13, 0x0a, 0x0f, 0x41, 0x55, 0x54, 0x48, 0x4f, 0x52, 0x49, 0x54, 0x59, 0x5f,
-	0x49, 0x53, 0x53, 0x55, 0x45, 0x10, 0x02, 0x22, 0xd5, 0x03, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66,
+	0x49, 0x53, 0x53, 0x55, 0x45, 0x10, 0x02, 0x22, 0xd3, 0x03, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66,
 	0x69, 0x67, 0x12, 0x25, 0x0a, 0x0e, 0x61, 0x6c, 0x6c, 0x6f, 0x77, 0x5f, 0x69, 0x6e, 0x73, 0x65,
 	0x63, 0x75, 0x72, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x08, 0x52, 0x0d, 0x61, 0x6c, 0x6c, 0x6f,
 	0x77, 0x49, 0x6e, 0x73, 0x65, 0x63, 0x75, 0x72, 0x65, 0x12, 0x4a, 0x0a, 0x0b, 0x63, 0x65, 0x72,
@@ -311,32 +311,32 @@ var file_transport_internet_tls_config_proto_rawDesc = []byte{
 	0x6e, 0x61, 0x6d, 0x65, 0x18, 0x03, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0a, 0x73, 0x65, 0x72, 0x76,
 	0x65, 0x72, 0x4e, 0x61, 0x6d, 0x65, 0x12, 0x23, 0x0a, 0x0d, 0x6e, 0x65, 0x78, 0x74, 0x5f, 0x70,
 	0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x18, 0x04, 0x20, 0x03, 0x28, 0x09, 0x52, 0x0c, 0x6e,
-	0x65, 0x78, 0x74, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x12, 0x3c, 0x0a, 0x1a, 0x64,
+	0x65, 0x78, 0x74, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x12, 0x3a, 0x0a, 0x19, 0x65,
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+	0x6e, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x73, 0x65, 0x73, 0x73, 0x69, 0x6f, 0x6e, 0x5f, 0x72, 0x65,
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+	0x73, 0x75, 0x6d, 0x70, 0x74, 0x69, 0x6f, 0x6e, 0x18, 0x05, 0x20, 0x01, 0x28, 0x08, 0x52, 0x17,
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 }
 
 var (

transport/internet/tls/config.proto

@@ -37,8 +37,8 @@ message Config {
   // Lists of string as ALPN values.
   repeated string next_protocol = 4;
 
-  // Whether or not to disable session (ticket) resumption.
+  // Whether or not to enable session (ticket) resumption.
-  bool disable_session_resumption = 5;
+  bool enable_session_resumption = 5;
 
   // If true, root certificates on the system will not be loaded for
   // verification.

transport/internet/udp/dispatcher.go

@@ -66,7 +66,7 @@ func (v *Dispatcher) getInboundRay(ctx context.Context, dest net.Destination) *c
 		cancel()
 		v.RemoveRay(dest)
 	}
-	timer := signal.CancelAfterInactivity(ctx, removeRay, time.Second*4)
+	timer := signal.CancelAfterInactivity(ctx, removeRay, time.Minute)
 	link, _ := v.dispatcher.Dispatch(ctx, dest)
 	entry := &connEntry{
 		link:   link,

transport/internet/xtls/config.go

@@ -185,7 +185,7 @@ func (c *Config) GetXTLSConfig(opts ...Option) *xtls.Config {
 			RootCAs:                root,
 			InsecureSkipVerify:     false,
 			NextProtos:             nil,
-			SessionTicketsDisabled: false,
+			SessionTicketsDisabled: true,
 		}
 	}
 
@@ -194,7 +194,7 @@ func (c *Config) GetXTLSConfig(opts ...Option) *xtls.Config {
 		RootCAs:                root,
 		InsecureSkipVerify:     c.AllowInsecure,
 		NextProtos:             c.NextProtocol,
-		SessionTicketsDisabled: c.DisableSessionResumption,
+		SessionTicketsDisabled: !c.EnableSessionResumption,
 	}
 
 	for _, opt := range opts {

transport/internet/xtls/config.pb.go

@@ -160,8 +160,8 @@ type Config struct {
 	ServerName string `protobuf:"bytes,3,opt,name=server_name,json=serverName,proto3" json:"server_name,omitempty"`
 	// Lists of string as ALPN values.
 	NextProtocol []string `protobuf:"bytes,4,rep,name=next_protocol,json=nextProtocol,proto3" json:"next_protocol,omitempty"`
-	// Whether or not to disable session (ticket) resumption.
+	// Whether or not to enable session (ticket) resumption.
-	DisableSessionResumption bool `protobuf:"varint,5,opt,name=disable_session_resumption,json=disableSessionResumption,proto3" json:"disable_session_resumption,omitempty"`
+	EnableSessionResumption bool `protobuf:"varint,5,opt,name=enable_session_resumption,json=enableSessionResumption,proto3" json:"enable_session_resumption,omitempty"`
 	// If true, root certificates on the system will not be loaded for
 	// verification.
 	DisableSystemRoot bool `protobuf:"varint,6,opt,name=disable_system_root,json=disableSystemRoot,proto3" json:"disable_system_root,omitempty"`
@@ -235,9 +235,9 @@ func (x *Config) GetNextProtocol() []string {
 	return nil
 }
 
-func (x *Config) GetDisableSessionResumption() bool {
+func (x *Config) GetEnableSessionResumption() bool {
 	if x != nil {
-		return x.DisableSessionResumption
+		return x.EnableSessionResumption
 	}
 	return false
 }
@@ -299,7 +299,7 @@ var file_transport_internet_xtls_config_proto_rawDesc = []byte{
 	0x0c, 0x45, 0x4e, 0x43, 0x49, 0x50, 0x48, 0x45, 0x52, 0x4d, 0x45, 0x4e, 0x54, 0x10, 0x00, 0x12,
 	0x14, 0x0a, 0x10, 0x41, 0x55, 0x54, 0x48, 0x4f, 0x52, 0x49, 0x54, 0x59, 0x5f, 0x56, 0x45, 0x52,
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 	0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x25, 0x0a, 0x0e, 0x61, 0x6c, 0x6c, 0x6f, 0x77, 0x5f, 0x69,
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@@ -312,32 +312,32 @@ var file_transport_internet_xtls_config_proto_rawDesc = []byte{
 	0x73, 0x65, 0x72, 0x76, 0x65, 0x72, 0x4e, 0x61, 0x6d, 0x65, 0x12, 0x23, 0x0a, 0x0d, 0x6e, 0x65,
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-	0x74, 0x6f, 0x33,
+	0x33,
 }
 
 var (

transport/internet/xtls/config.proto

@@ -37,8 +37,8 @@ message Config {
   // Lists of string as ALPN values.
   repeated string next_protocol = 4;
 
-  // Whether or not to disable session (ticket) resumption.
+  // Whether or not to enable session (ticket) resumption.
-  bool disable_session_resumption = 5;
+  bool enable_session_resumption = 5;
 
   // If true, root certificates on the system will not be loaded for
   // verification.