Xray-core v26.6.27

Sponsor & Donation & NFTs: https://github.com/XTLS/Xray-core/issues/3668
Project X Channel: https://t.me/projectXtls

Announcement of NFTs by Project X: https://github.com/XTLS/Xray-core/discussions/3633
Project X NFT: https://opensea.io/assets/ethereum/0x5ee362866001613093361eb8569d59c4141b76d1/1

VLESS Post-Quantum Encryption: https://github.com/XTLS/Xray-core/pull/5067
VLESS NFT: https://opensea.io/collection/vless

XHTTP: Beyond REALITY: https://github.com/XTLS/Xray-core/discussions/4113
REALITY NFT: https://opensea.io/assets/ethereum/0x5ee362866001613093361eb8569d59c4141b76d1/2

.github/workflows/docker.yml

@@ -65,7 +65,7 @@ jobs:
           echo "LATEST=$LATEST" >>${GITHUB_ENV}
 
       - name: Checkout code
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v4

.github/workflows/release-win7.yml

@@ -14,13 +14,13 @@ jobs:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
     steps:
       - name: Restore Geodat Cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: resources
           key: xray-geodat-
 
       - name: Restore Wintun Cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: resources
           key: xray-wintun-
@@ -83,7 +83,7 @@ jobs:
       CGO_ENABLED: 0
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Show workflow information
         run: |
@@ -119,13 +119,13 @@ jobs:
           # go build -o build_assets/wxray.exe -trimpath -buildvcs=false -gcflags="all=-l=4" -ldflags="-H windowsgui -X github.com/xtls/xray-core/core.build=${COMMID} -s -w -buildid=" -v ./main
 
       - name: Restore Geodat Cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: resources
           key: xray-geodat-
 
       - name: Restore Wintun Cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: resources
           key: xray-wintun-

.github/workflows/release.yml

@@ -14,13 +14,13 @@ jobs:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
     steps:
       - name: Restore Geodat Cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: resources
           key: xray-geodat-
 
       - name: Restore Wintun Cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: resources
           key: xray-wintun-
@@ -170,7 +170,7 @@ jobs:
       CGO_ENABLED: 0
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
 
       - name: Set up NDK
         if: matrix.goos == 'android'
@@ -225,14 +225,14 @@ jobs:
           fi
 
       - name: Restore Geodat Cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: resources
           key: xray-geodat-
 
       - name: Restore Wintun Cache
         if: matrix.goos == 'windows'
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: resources
           key: xray-wintun-

.github/workflows/scheduled-assets-update.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Restore Geodat Cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: resources
           key: xray-geodat-
@@ -59,7 +59,7 @@ jobs:
             done
 
       - name: Save Geodat Cache
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         if: ${{ steps.update.outputs.unhit }}
         with:
           path: resources
@@ -73,7 +73,7 @@ jobs:
       ASSETHASH: 07c256185d6ee3652e09fa55c0b673e2624b565e02c4b9091c79ca7d2f24ef51
     steps:
       - name: Restore Wintun Cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: resources
           key: xray-wintun-
@@ -129,7 +129,7 @@ jobs:
             fi
 
       - name: Save Wintun Cache
-        uses: actions/cache/save@v5
+        uses: actions/cache/save@v6
         if: ${{ steps.update.outputs.unhit }}
         with:
           path: resources

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
     steps:
       - name: Restore Geodat Cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: resources
           key: xray-geodat-
@@ -40,7 +40,7 @@ jobs:
     if: github.event_name != 'pull_request' || github.event.pull_request.head.repo.full_name != github.event.pull_request.base.repo.full_name
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       - name: Check Proto Version Header
         run: |
           head -n 4 core/config.pb.go > ref.txt
@@ -59,7 +59,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       - name: Set up Go
         uses: actions/setup-go@v6
         with:
@@ -83,14 +83,14 @@ jobs:
         os: [windows-latest, ubuntu-latest, macos-latest]
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v6
+        uses: actions/checkout@v7
       - name: Set up Go
         uses: actions/setup-go@v6
         with:
           go-version-file: go.mod
           check-latest: true
       - name: Restore Geodat Cache
-        uses: actions/cache/restore@v5
+        uses: actions/cache/restore@v6
         with:
           path: resources
           key: xray-geodat-

README.md

@@ -73,6 +73,7 @@
   - [Xray_bash_onekey](https://github.com/hello-yunshu/Xray_bash_onekey), [XTool](https://github.com/LordPenguin666/XTool), [VPainLess](https://github.com/vpainless/vpainless)
   - [v2ray-agent](https://github.com/mack-a/v2ray-agent), [Xray_onekey](https://github.com/wulabing/Xray_onekey), [ProxySU](https://github.com/proxysu/ProxySU)
 - Magisk
+  - [Magic_V2Ray](https://github.com/vincentng295/Magic_V2Ray)
   - [Xray_For_Magisk](https://github.com/E7KMbb/Xray_For_Magisk)
 - Homebrew
   - `brew install xray`

app/dns/dnscommon.go

@@ -198,9 +198,14 @@ func parseResponse(payload []byte) (*IPRecord, error) {
 	ipRecord := &IPRecord{
 		ReqID:     h.ID,
 		RCode:     h.RCode,
-		Expire:    now.Add(time.Second * dns_feature.DefaultTTL),
 		RawHeader: &h,
 	}
+	defer func() {
+		// set to default TTL if no valid TTL is found
+		if ipRecord.Expire.IsZero() {
+			ipRecord.Expire = now.Add(time.Second * dns_feature.DefaultTTL)
+		}
+	}()
 
 L:
 	for {
@@ -217,7 +222,7 @@ L:
 			ttl = 1
 		}
 		expire := now.Add(time.Duration(ttl) * time.Second)
-		if ipRecord.Expire.After(expire) {
+		if ipRecord.Expire.IsZero() || ipRecord.Expire.After(expire) {
 			ipRecord.Expire = expire
 		}
 

app/geodata/download.go

@@ -2,6 +2,7 @@ package geodata
 
 import (
 	"context"
+	"crypto/tls"
 	go_errors "errors"
 	"io"
 	"net/http"
@@ -9,6 +10,7 @@ import (
 	"path/filepath"
 	"time"
 
+	utls "github.com/refraction-networking/utls"
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/platform/filesystem"
@@ -16,6 +18,7 @@ import (
 	"github.com/xtls/xray-core/common/utils"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/transport/internet/tagged"
+	"golang.org/x/net/http2"
 )
 
 const idleTimeout = 30 * time.Second
@@ -26,8 +29,9 @@ type stage struct {
 }
 
 type downloader struct {
-	ctx    context.Context
-	client *http.Client
+	ctx         context.Context
+	httpClient  *http.Client
+	httpsClient *http.Client
 }
 
 type idleConn struct {
@@ -53,52 +57,84 @@ func (c *idleConn) Write(b []byte) (int, error) {
 
 func newDownloader(ctx context.Context, dispatcher routing.Dispatcher, outbound string) *downloader {
 	return &downloader{
-		ctx:    ctx,
-		client: newClient(ctx, dispatcher, outbound),
+		ctx:         ctx,
+		httpClient:  newClient(ctx, dispatcher, outbound, false),
+		httpsClient: newClient(ctx, dispatcher, outbound, true),
 	}
 }
 
-func newClient(baseCtx context.Context, dispatcher routing.Dispatcher, outbound string) *http.Client {
-	return &http.Client{
-		Transport: &http.Transport{
-			Proxy:             nil,
-			DisableKeepAlives: true,
-			DialContext: func(ctx context.Context, network, address string) (net.Conn, error) {
-				var conn net.Conn
-				err := task.Run(ctx, func() error {
-					if tagged.Dialer == nil {
-						return errors.New("tagged dialer is not initialized")
-					}
-					dest, err := net.ParseDestination(network + ":" + address)
-					if err != nil {
-						return errors.New("cannot understand address").Base(err)
-					}
-					c, err := tagged.Dialer(baseCtx, dispatcher, dest, outbound)
-					if err != nil {
-						return errors.New("cannot dial remote address ", dest).Base(err)
-					}
-					conn = c
-					return nil
-				})
-				if err != nil {
-					return nil, errors.New("cannot finish connection").Base(err)
-				}
-				return &idleConn{
-					Conn: conn,
-				}, nil
-			},
-			TLSHandshakeTimeout:   idleTimeout,
-			ResponseHeaderTimeout: idleTimeout,
-		},
-		CheckRedirect: func(req *http.Request, via []*http.Request) error {
-			if req.URL.Scheme != "https" {
-				return errors.New("redirected to non-https URL: ", req.URL.String())
+func newClient(baseCtx context.Context, dispatcher routing.Dispatcher, outbound string, isHTTPS bool) *http.Client {
+	dial := func(ctx context.Context, network, address string) (net.Conn, error) {
+		var conn net.Conn
+		err := task.Run(ctx, func() error {
+			if tagged.Dialer == nil {
+				return errors.New("tagged dialer is not initialized")
 			}
-			if len(via) >= 10 {
-				return errors.New("stopped after 10 redirects")
+			dest, err := net.ParseDestination(network + ":" + address)
+			if err != nil {
+				return errors.New("cannot understand address").Base(err)
 			}
+			c, err := tagged.Dialer(baseCtx, dispatcher, dest, outbound)
+			if err != nil {
+				return errors.New("cannot dial remote address ", dest).Base(err)
+			}
+			conn = c
 			return nil
-		},
+		})
+		if err != nil {
+			return nil, errors.New("cannot finish connection").Base(err)
+		}
+		return &idleConn{
+			Conn: conn,
+		}, nil
+	}
+	if isHTTPS {
+		return &http.Client{
+			Transport: &http2.Transport{
+				DialTLSContext: func(ctx context.Context, network string, address string, cfg *tls.Config) (net.Conn, error) {
+					conn, err := dial(ctx, network, address)
+					if err != nil {
+						return nil, err
+					}
+					host, _, _ := net.SplitHostPort(address)
+					tlsConn := utls.UClient(conn, &utls.Config{ServerName: host}, utls.HelloChrome_Auto)
+					handshakeCtx, cancel := context.WithTimeout(ctx, idleTimeout)
+					defer cancel()
+					if err := tlsConn.HandshakeContext(handshakeCtx); err != nil {
+						conn.Close()
+						return nil, err
+					}
+					return tlsConn, nil
+				},
+			},
+			CheckRedirect: func(req *http.Request, via []*http.Request) error {
+				if req.URL.Scheme != "https" {
+					return errors.New("redirected to non-https URL: ", req.URL.String())
+				}
+				if len(via) >= 10 {
+					return errors.New("stopped after 10 redirects")
+				}
+				return nil
+			},
+		}
+	} else {
+		return &http.Client{
+			Transport: &http.Transport{
+				Proxy:                 nil,
+				DisableKeepAlives:     true,
+				DialContext:           dial,
+				ResponseHeaderTimeout: idleTimeout,
+			},
+			CheckRedirect: func(req *http.Request, via []*http.Request) error {
+				if req.URL.Scheme != "https" {
+					return errors.New("redirected to non-https URL: ", req.URL.String())
+				}
+				if len(via) >= 10 {
+					return errors.New("stopped after 10 redirects")
+				}
+				return nil
+			},
+		}
 	}
 }
 
@@ -160,7 +196,13 @@ func (d *downloader) fetch(rawURL string, writer io.Writer) error {
 	}
 	utils.TryDefaultHeadersWith(req.Header, "nav")
 
-	resp, err := d.client.Do(req)
+	var client *http.Client
+	if req.URL.Scheme == "https" {
+		client = d.httpsClient
+	} else {
+		client = d.httpClient
+	}
+	resp, err := client.Do(req)
 	if err != nil {
 		return err
 	}

app/metrics/metrics.go

@@ -2,15 +2,18 @@ package metrics
 
 import (
 	"context"
+	"encoding/json"
+	stderrors "errors"
 	"expvar"
+	stdnet "net"
 	"net/http"
-	_ "net/http/pprof"
+	"net/http/pprof"
 	"strings"
 
 	"github.com/xtls/xray-core/app/observatory"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
-	"github.com/xtls/xray-core/common/net"
+	xnet "github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/signal/done"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/extension"
@@ -21,15 +24,17 @@ import (
 type MetricsHandler struct {
 	ohm          outbound.Manager
 	statsManager feature_stats.Manager
-	observatory  extension.Observatory
+	ctx          context.Context
 	tag          string
 	listen       string
-	tcpListener  net.Listener
+	tcpListener  xnet.Listener
+	listener     *OutboundListener
 }
 
 // NewMetricsHandler creates a new MetricsHandler based on the given config.
 func NewMetricsHandler(ctx context.Context, config *Config) (*MetricsHandler, error) {
 	c := &MetricsHandler{
+		ctx:    ctx,
 		tag:    config.Tag,
 		listen: config.Listen,
 	}
@@ -37,46 +42,6 @@ func NewMetricsHandler(ctx context.Context, config *Config) (*MetricsHandler, er
 		c.statsManager = sm
 		c.ohm = om
 	}))
-	expvar.Publish("stats", expvar.Func(func() interface{} {
-		resp := map[string]map[string]map[string]int64{
-			"inbound":  {},
-			"outbound": {},
-			"user":     {},
-		}
-		c.statsManager.VisitCounters(func(name string, counter feature_stats.Counter) bool {
-			nameSplit := strings.Split(name, ">>>")
-			typeName, tagOrUser, direction := nameSplit[0], nameSplit[1], nameSplit[3]
-			if item, found := resp[typeName][tagOrUser]; found {
-				item[direction] = counter.Value()
-			} else {
-				resp[typeName][tagOrUser] = map[string]int64{
-					direction: counter.Value(),
-				}
-			}
-			return true
-		})
-		return resp
-	}))
-	expvar.Publish("observatory", expvar.Func(func() interface{} {
-		if c.observatory == nil {
-			common.Must(core.RequireFeatures(ctx, func(observatory extension.Observatory) error {
-				c.observatory = observatory
-				return nil
-			}))
-			if c.observatory == nil {
-				return nil
-			}
-		}
-		resp := map[string]*observatory.OutboundStatus{}
-		if o, err := c.observatory.GetObservation(context.Background()); err != nil {
-			return err
-		} else {
-			for _, x := range o.(*observatory.ObservationResult).GetStatus() {
-				resp[x.OutboundTag] = x
-			}
-		}
-		return resp
-	}))
 	return c, nil
 }
 
@@ -85,45 +50,172 @@ func (p *MetricsHandler) Type() interface{} {
 }
 
 func (p *MetricsHandler) Start() error {
+	handler := p.httpHandler()
+
 	// direct listen a port if listen is set
 	if p.listen != "" {
-		TCPlistener, err := net.Listen("tcp", p.listen)
+		TCPlistener, err := xnet.Listen("tcp", p.listen)
 		if err != nil {
 			return err
 		}
 		p.tcpListener = TCPlistener
 		errors.LogInfo(context.Background(), "Metrics server listening on ", p.listen)
 
-		go func() {
-			if err := http.Serve(TCPlistener, http.DefaultServeMux); err != nil {
-				errors.LogErrorInner(context.Background(), err, "failed to start metrics server")
-			}
-		}()
+		go p.serve(TCPlistener, handler)
+	}
+
+	if p.tag == "" {
+		if p.tcpListener == nil {
+			return errors.New("metrics must have a tag or listen address")
+		}
+		return nil
 	}
 
 	listener := &OutboundListener{
-		buffer: make(chan net.Conn, 4),
+		buffer: make(chan xnet.Conn, 4),
 		done:   done.New(),
 	}
+	p.listener = listener
 
-	go func() {
-		if err := http.Serve(listener, http.DefaultServeMux); err != nil {
-			errors.LogErrorInner(context.Background(), err, "failed to start metrics server")
-		}
-	}()
+	go p.serve(listener, handler)
 
 	if err := p.ohm.RemoveHandler(context.Background(), p.tag); err != nil {
 		errors.LogInfo(context.Background(), "failed to remove existing handler")
 	}
 
-	return p.ohm.AddHandler(context.Background(), &Outbound{
+	if err := p.ohm.AddHandler(context.Background(), &Outbound{
 		tag:      p.tag,
 		listener: listener,
-	})
+	}); err != nil {
+		if closeErr := p.Close(); closeErr != nil {
+			errors.LogErrorInner(context.Background(), closeErr, "failed to close metrics server after start failure")
+		}
+		return err
+	}
+
+	return nil
 }
 
 func (p *MetricsHandler) Close() error {
-	return nil
+	var errs []error
+	if p.tcpListener != nil {
+		errs = append(errs, p.tcpListener.Close())
+		p.tcpListener = nil
+	}
+	if p.listener != nil {
+		errs = append(errs, p.listener.Close())
+		p.listener = nil
+	}
+	if p.ohm != nil && p.tag != "" {
+		if err := p.ohm.RemoveHandler(context.Background(), p.tag); err != nil {
+			errors.LogInfo(context.Background(), "failed to remove metrics handler")
+		}
+	}
+	return errors.Combine(errs...)
+}
+
+func (p *MetricsHandler) serve(listener xnet.Listener, handler http.Handler) {
+	if err := http.Serve(listener, handler); err != nil && !isClosedListenerError(err) {
+		errors.LogErrorInner(context.Background(), err, "failed to start metrics server")
+	}
+}
+
+func isClosedListenerError(err error) bool {
+	if err == nil {
+		return true
+	}
+	if stderrors.Is(err, stdnet.ErrClosed) || stderrors.Is(err, http.ErrServerClosed) {
+		return true
+	}
+	errText := err.Error()
+	return strings.Contains(errText, "listen closed") ||
+		strings.Contains(errText, "use of closed network connection")
+}
+
+func (p *MetricsHandler) httpHandler() http.Handler {
+	mux := http.NewServeMux()
+	mux.HandleFunc("/debug/vars", p.handleDebugVars)
+	mux.HandleFunc("/debug/pprof/", pprof.Index)
+	mux.HandleFunc("/debug/pprof/cmdline", pprof.Cmdline)
+	mux.HandleFunc("/debug/pprof/profile", pprof.Profile)
+	mux.HandleFunc("/debug/pprof/symbol", pprof.Symbol)
+	mux.HandleFunc("/debug/pprof/trace", pprof.Trace)
+	return mux
+}
+
+func (p *MetricsHandler) handleDebugVars(w http.ResponseWriter, r *http.Request) {
+	w.Header().Set("Content-Type", "application/json; charset=utf-8")
+	vars := map[string]json.RawMessage{}
+	expvar.Do(func(kv expvar.KeyValue) {
+		value := json.RawMessage(kv.Value.String())
+		if !json.Valid(value) {
+			value = json.RawMessage("null")
+		}
+		vars[kv.Key] = value
+	})
+	vars["stats"] = marshalJSON(p.stats())
+	vars["observatory"] = marshalJSON(p.observatoryStatus())
+
+	payload, err := json.Marshal(vars)
+	if err != nil {
+		http.Error(w, err.Error(), http.StatusInternalServerError)
+		return
+	}
+	w.Write(payload)
+}
+
+func marshalJSON(value interface{}) json.RawMessage {
+	data, err := json.Marshal(value)
+	if err != nil {
+		return json.RawMessage("null")
+	}
+	return data
+}
+
+func (p *MetricsHandler) stats() map[string]map[string]map[string]int64 {
+	resp := map[string]map[string]map[string]int64{
+		"inbound":  {},
+		"outbound": {},
+		"user":     {},
+	}
+	p.statsManager.VisitCounters(func(name string, counter feature_stats.Counter) bool {
+		nameSplit := strings.Split(name, ">>>")
+		if len(nameSplit) < 4 {
+			return true
+		}
+		typeName, tagOrUser, direction := nameSplit[0], nameSplit[1], nameSplit[3]
+		items, found := resp[typeName]
+		if !found {
+			items = map[string]map[string]int64{}
+			resp[typeName] = items
+		}
+		if item, found := items[tagOrUser]; found {
+			item[direction] = counter.Value()
+		} else {
+			items[tagOrUser] = map[string]int64{
+				direction: counter.Value(),
+			}
+		}
+		return true
+	})
+	return resp
+}
+
+func (p *MetricsHandler) observatoryStatus() interface{} {
+	feature := core.MustFromContext(p.ctx).GetFeature(extension.ObservatoryType())
+	if feature == nil {
+		return nil
+	}
+	observatoryFeature := feature.(extension.Observatory)
+	resp := map[string]*observatory.OutboundStatus{}
+	if o, err := observatoryFeature.GetObservation(context.Background()); err != nil {
+		return err
+	} else {
+		for _, x := range o.(*observatory.ObservationResult).GetStatus() {
+			resp[x.OutboundTag] = x
+		}
+	}
+	return resp
 }
 
 func init() {

app/metrics/metrics_test.go

@@ -0,0 +1,161 @@
+package metrics
+
+import (
+	"context"
+	"encoding/json"
+	stdnet "net"
+	"net/http"
+	"net/http/httptest"
+	"testing"
+
+	"github.com/xtls/xray-core/app/dispatcher"
+	"github.com/xtls/xray-core/app/proxyman"
+	_ "github.com/xtls/xray-core/app/proxyman/inbound"
+	_ "github.com/xtls/xray-core/app/proxyman/outbound"
+	appstats "github.com/xtls/xray-core/app/stats"
+	"github.com/xtls/xray-core/common/serial"
+	"github.com/xtls/xray-core/core"
+	feature_outbound "github.com/xtls/xray-core/features/outbound"
+)
+
+func TestMetricsCanRestartInSameProcess(t *testing.T) {
+	for i := 0; i < 2; i++ {
+		server := startMetricsTestServer(t)
+		readMetricsVars(t, server)
+		readMetricsPprof(t, server)
+		if err := server.Close(); err != nil {
+			t.Fatalf("failed to close metrics server: %v", err)
+		}
+	}
+}
+
+func TestMetricsCanRunMultipleInstancesInSameProcess(t *testing.T) {
+	server1 := startMetricsTestServer(t)
+	t.Cleanup(func() {
+		_ = server1.Close()
+	})
+	server2 := startMetricsTestServer(t)
+	t.Cleanup(func() {
+		_ = server2.Close()
+	})
+
+	readMetricsVars(t, server1)
+	readMetricsVars(t, server2)
+}
+
+func TestMetricsListenOnlyWithoutTagDoesNotRegisterOutbound(t *testing.T) {
+	listen := pickMetricsListenAddress(t)
+	server := startMetricsTestServerWithMetricsConfig(t, &Config{
+		Listen: listen,
+	})
+	t.Cleanup(func() {
+		_ = server.Close()
+	})
+
+	response, err := http.Get("http://" + listen + "/debug/vars")
+	if err != nil {
+		t.Fatalf("failed to read listen-only metrics: %v", err)
+	}
+	defer response.Body.Close()
+	if response.StatusCode != http.StatusOK {
+		t.Fatalf("unexpected listen-only metrics status: %d", response.StatusCode)
+	}
+
+	outboundManager := server.GetFeature(feature_outbound.ManagerType()).(feature_outbound.Manager)
+	if handlers := outboundManager.ListHandlers(context.Background()); len(handlers) != 0 {
+		t.Fatalf("listen-only metrics registered outbound handlers: got %d, want 0", len(handlers))
+	}
+}
+
+func startMetricsTestServer(t *testing.T) *core.Instance {
+	return startMetricsTestServerWithMetricsConfig(t, &Config{
+		Tag: "metrics_out",
+	})
+}
+
+func startMetricsTestServerWithMetricsConfig(t *testing.T, metricsConfig *Config) *core.Instance {
+	t.Helper()
+
+	server, err := core.New(metricsTestConfig(metricsConfig))
+	if err != nil {
+		t.Fatalf("failed to create metrics server: %v", err)
+	}
+	if err := server.Start(); err != nil {
+		_ = server.Close()
+		t.Fatalf("failed to start metrics server: %v", err)
+	}
+	return server
+}
+
+func metricsTestConfig(metricsConfig *Config) *core.Config {
+	return &core.Config{
+		App: []*serial.TypedMessage{
+			serial.ToTypedMessage(&dispatcher.Config{}),
+			serial.ToTypedMessage(&proxyman.InboundConfig{}),
+			serial.ToTypedMessage(&proxyman.OutboundConfig{}),
+			serial.ToTypedMessage(&appstats.Config{}),
+			serial.ToTypedMessage(metricsConfig),
+		},
+	}
+}
+
+func pickMetricsListenAddress(t *testing.T) string {
+	t.Helper()
+
+	listener, err := stdnet.Listen("tcp", "127.0.0.1:0")
+	if err != nil {
+		t.Fatalf("failed to pick metrics listen address: %v", err)
+	}
+	defer listener.Close()
+	return listener.Addr().String()
+}
+
+func readMetricsVars(t *testing.T, server *core.Instance) {
+	t.Helper()
+
+	recorder := httptest.NewRecorder()
+	metricsHandler(t, server).httpHandler().ServeHTTP(
+		recorder,
+		httptest.NewRequest(http.MethodGet, "/debug/vars", nil),
+	)
+
+	if recorder.Code != http.StatusOK {
+		t.Fatalf("unexpected metrics vars status: %d", recorder.Code)
+	}
+
+	var payload map[string]interface{}
+	if err := json.NewDecoder(recorder.Body).Decode(&payload); err != nil {
+		t.Fatalf("failed to decode metrics vars: %v", err)
+	}
+	if _, found := payload["stats"]; !found {
+		t.Fatal("metrics vars missing stats")
+	}
+	if _, found := payload["observatory"]; !found {
+		t.Fatal("metrics vars missing observatory")
+	}
+}
+
+func readMetricsPprof(t *testing.T, server *core.Instance) {
+	t.Helper()
+
+	recorder := httptest.NewRecorder()
+	metricsHandler(t, server).httpHandler().ServeHTTP(
+		recorder,
+		httptest.NewRequest(http.MethodGet, "/debug/pprof/goroutine?debug=1", nil),
+	)
+
+	if recorder.Code != http.StatusOK {
+		t.Fatalf("unexpected metrics pprof status: %d", recorder.Code)
+	}
+}
+
+func metricsHandler(t *testing.T, server *core.Instance) *MetricsHandler {
+	t.Helper()
+
+	feature := server.GetFeature((*MetricsHandler)(nil))
+	handler, ok := feature.(*MetricsHandler)
+	if !ok || handler == nil {
+		t.Fatal("metrics handler not registered")
+	}
+	return handler
+}

common/geodata/domain_matcher.go

@@ -220,7 +220,7 @@ func parseDomain(d *Domain) (strmatcher.Matcher, error) {
 	case Domain_Regex:
 		return strmatcher.Regex.New(d.Value)
 	case Domain_Domain:
-		return strmatcher.Domain.New(d.Value)
+		return strmatcher.Domain.New(strings.ToLower(d.Value))
 	case Domain_Full:
 		return strmatcher.Full.New(strings.ToLower(d.Value))
 	default:

common/geodata/domain_registry.go

@@ -6,12 +6,14 @@ import (
 	"sync/atomic"
 
 	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/utils"
+	"github.com/xtls/xray-core/common/uuid"
 )
 
 type DomainRegistry struct {
 	mu       sync.Mutex
 	factory  DomainMatcherFactory
-	matchers []*DynamicDomainMatcher
+	matchers *utils.WeakCacheMap[uuid.UUID, DynamicDomainMatcher]
 }
 
 func (r *DomainRegistry) BuildDomainMatcher(rules []*DomainRule) (DomainMatcher, error) {
@@ -24,7 +26,7 @@ func (r *DomainRegistry) BuildDomainMatcher(rules []*DomainRule) (DomainMatcher,
 	}
 
 	d := NewDynamicDomainMatcher(rules, m)
-	r.matchers = append(r.matchers, d)
+	r.matchers.Store(uuid.New(), d)
 	return d, nil
 }
 
@@ -32,15 +34,20 @@ func (r *DomainRegistry) Reload() error {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 
-	errors.LogInfo(context.Background(), "reloading GeoSite data for ", len(r.matchers), " domain matcher(s)")
+	var matchers []*DynamicDomainMatcher
+	r.matchers.Range(func(_ uuid.UUID, matcher *DynamicDomainMatcher) bool {
+		matchers = append(matchers, matcher)
+		return true
+	})
+	errors.LogInfo(context.Background(), "reloading GeoSite data for ", len(matchers), " domain matcher(s)")
 
 	factory := newDomainMatcherFactory()
 	type reloadEntry struct {
 		dynamic *DynamicDomainMatcher
 		matcher DomainMatcher
 	}
-	reloaded := make([]reloadEntry, len(r.matchers))
-	for i, d := range r.matchers {
+	reloaded := make([]reloadEntry, len(matchers))
+	for i, d := range matchers {
 		m, err := factory.BuildMatcher(d.rules)
 		if err != nil {
 			errors.LogErrorInner(context.Background(), err, "failed to reload GeoSite data for domain matcher ", i)
@@ -52,13 +59,14 @@ func (r *DomainRegistry) Reload() error {
 		entry.dynamic.Reload(entry.matcher)
 	}
 	r.factory = factory
-	errors.LogInfo(context.Background(), "reloaded GeoSite data for ", len(r.matchers), " domain matcher(s)")
+	errors.LogInfo(context.Background(), "reloaded GeoSite data for ", len(matchers), " domain matcher(s)")
 	return nil
 }
 
 func newDomainRegistry() *DomainRegistry {
 	return &DomainRegistry{
-		factory: newDomainMatcherFactory(),
+		factory:  newDomainMatcherFactory(),
+		matchers: utils.NewWeakCacheMap[uuid.UUID, DynamicDomainMatcher](),
 	}
 }
 

common/geodata/ip_registry.go

@@ -7,25 +7,27 @@ import (
 
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/utils"
+	"github.com/xtls/xray-core/common/uuid"
 )
 
 type IPRegistry struct {
-	mu           sync.Mutex
-	ipsetFactory *IPSetFactory
-	matchers     []*DynamicIPMatcher
+	mu       sync.Mutex
+	factory  *IPSetFactory
+	matchers *utils.WeakCacheMap[uuid.UUID, DynamicIPMatcher]
 }
 
 func (r *IPRegistry) BuildIPMatcher(rules []*IPRule) (IPMatcher, error) {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 
-	m, err := buildOptimizedIPMatcher(r.ipsetFactory, rules)
+	m, err := buildOptimizedIPMatcher(r.factory, rules)
 	if err != nil {
 		return nil, err
 	}
 
 	d := NewDynamicIPMatcher(rules, m)
-	r.matchers = append(r.matchers, d)
+	r.matchers.Store(uuid.New(), d)
 	return d, nil
 }
 
@@ -33,15 +35,20 @@ func (r *IPRegistry) Reload() error {
 	r.mu.Lock()
 	defer r.mu.Unlock()
 
-	errors.LogInfo(context.Background(), "reloading GeoIP data for ", len(r.matchers), " IP matcher(s)")
+	var matchers []*DynamicIPMatcher
+	r.matchers.Range(func(_ uuid.UUID, matcher *DynamicIPMatcher) bool {
+		matchers = append(matchers, matcher)
+		return true
+	})
+	errors.LogInfo(context.Background(), "reloading GeoIP data for ", len(matchers), " IP matcher(s)")
 
 	factory := newIPSetFactory()
 	type reloadEntry struct {
 		dynamic *DynamicIPMatcher
 		matcher IPMatcher
 	}
-	reloaded := make([]reloadEntry, len(r.matchers))
-	for i, d := range r.matchers {
+	reloaded := make([]reloadEntry, len(matchers))
+	for i, d := range matchers {
 		m, err := buildOptimizedIPMatcher(factory, d.rules)
 		if err != nil {
 			errors.LogErrorInner(context.Background(), err, "failed to reload GeoIP data for IP matcher ", i)
@@ -52,14 +59,15 @@ func (r *IPRegistry) Reload() error {
 	for _, entry := range reloaded {
 		entry.dynamic.Reload(entry.matcher)
 	}
-	r.ipsetFactory = factory
-	errors.LogInfo(context.Background(), "reloaded GeoIP data for ", len(r.matchers), " IP matcher(s)")
+	r.factory = factory
+	errors.LogInfo(context.Background(), "reloaded GeoIP data for ", len(matchers), " IP matcher(s)")
 	return nil
 }
 
 func newIPRegistry() *IPRegistry {
 	return &IPRegistry{
-		ipsetFactory: newIPSetFactory(),
+		factory:  newIPSetFactory(),
+		matchers: utils.NewWeakCacheMap[uuid.UUID, DynamicIPMatcher](),
 	}
 }
 

common/geodata/rule_parser.go

@@ -138,7 +138,7 @@ func ParseDomainRule(r string, defaultType Domain_Type) (*DomainRule, error) {
 	}
 
 	prefix := 0
-	for _, ext := range [...]string{"ext:", "ext-domain:"} {
+	for _, ext := range [...]string{"ext:", "ext-domain:", "ext-site:"} {
 		if strings.HasPrefix(r, ext) {
 			prefix = len(ext)
 			break
@@ -167,7 +167,7 @@ func ParseDomainRules(rules []string, defaultType Domain_Type) ([]*DomainRule, e
 		}
 
 		prefix := 0
-		for _, ext := range [...]string{"ext:", "ext-domain:"} {
+		for _, ext := range [...]string{"ext:", "ext-domain:", "ext-site:"} {
 			if strings.HasPrefix(r, ext) {
 				prefix = len(ext)
 				break

common/protocol/http/headers.go

@@ -1,25 +1,41 @@
 package http
 
 import (
+	"context"
 	"net/http"
 	"strconv"
 	"strings"
 
+	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/net"
 )
 
-// ParseXForwardedFor parses X-Forwarded-For header in http headers, and return the IP list in it.
-func ParseXForwardedFor(header http.Header) []net.Address {
-	xff := header.Get("X-Forwarded-For")
-	if xff == "" {
-		return nil
+// ApplyTrustedXForwardedFor returns remoteAddr overridden by X-Forwarded-For only when a configured trusted header is present.
+func ApplyTrustedXForwardedFor(header http.Header, trusted []string, remoteAddr net.Addr) net.Addr {
+	value := header.Get("X-Forwarded-For")
+	if value == "" {
+		return remoteAddr
 	}
-	list := strings.Split(xff, ",")
-	addrs := make([]net.Address, 0, len(list))
-	for _, proxy := range list {
-		addrs = append(addrs, net.ParseAddress(proxy))
+	for _, t := range trusted {
+		if len(header.Values(t)) > 0 {
+			if idx := strings.IndexByte(value, ','); idx >= 0 {
+				value = value[:idx]
+			}
+			if addr := net.ParseAddress(value); addr.Family().IsIP() {
+				return &net.TCPAddr{
+					IP:   addr.IP(),
+					Port: 0,
+				}
+			}
+			return remoteAddr
+		}
 	}
-	return addrs
+	if len(trusted) == 0 {
+		errors.LogWarning(context.Background(), `received "X-Forwarded-For" from `, remoteAddr, ` but "sockopt.trustedXForwardedFor" is not configured; ignoring it and using the real remote address`)
+	} else {
+		errors.LogError(context.Background(), `ignored potentially forged "X-Forwarded-For" from `, remoteAddr, `: `, value)
+	}
+	return remoteAddr
 }
 
 // RemoveHopByHopHeaders removes hop by hop headers in http header list.

common/protocol/http/headers_test.go

@@ -2,23 +2,48 @@ package http_test
 
 import (
 	"bufio"
+	gonet "net"
 	"net/http"
 	"strings"
 	"testing"
 
-	"github.com/google/go-cmp/cmp"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
 	. "github.com/xtls/xray-core/common/protocol/http"
 )
 
-func TestParseXForwardedFor(t *testing.T) {
-	header := http.Header{}
-	header.Add("X-Forwarded-For", "129.78.138.66, 129.78.64.103")
-	addrs := ParseXForwardedFor(header)
-	if r := cmp.Diff(addrs, []net.Address{net.ParseAddress("129.78.138.66"), net.ParseAddress("129.78.64.103")}); r != "" {
-		t.Error(r)
-	}
+func TestApplyTrustedXForwardedFor(t *testing.T) {
+	remoteAddr := &gonet.TCPAddr{IP: gonet.ParseIP("127.0.0.1"), Port: 12345}
+
+	t.Run("ignore X-Forwarded-For without trusted header", func(t *testing.T) {
+		header := http.Header{}
+		header.Add("X-Forwarded-For", "129.78.138.66, 129.78.64.103")
+
+		if addr := ApplyTrustedXForwardedFor(header, nil, remoteAddr); addr != remoteAddr {
+			t.Fatalf("unexpected remote address: %v", addr)
+		}
+	})
+
+	t.Run("trust X-Forwarded-For", func(t *testing.T) {
+		header := http.Header{}
+		header.Add("X-Forwarded-For", "129.78.138.66, 129.78.64.103")
+		header.Add("X-Trusted-CDN", "")
+
+		addr := ApplyTrustedXForwardedFor(header, []string{"X-Trusted-CDN"}, remoteAddr)
+		if addr.String() != "129.78.138.66:0" {
+			t.Fatalf("unexpected remote address: %v", addr)
+		}
+	})
+
+	t.Run("ignore non-IP X-Forwarded-For", func(t *testing.T) {
+		header := http.Header{}
+		header.Add("X-Forwarded-For", "example.com")
+		header.Add("X-Trusted-CDN", "")
+
+		if addr := ApplyTrustedXForwardedFor(header, []string{"X-Trusted-CDN"}, remoteAddr); addr != remoteAddr {
+			t.Fatalf("unexpected remote address: %v", addr)
+		}
+	})
 }
 
 func TestHopByHopHeadersRemoving(t *testing.T) {

common/utils/weak_cache.go

@@ -1,6 +1,7 @@
 package utils
 
 import (
+	"maps"
 	"runtime"
 	"sync"
 	"weak"
@@ -43,3 +44,16 @@ func (c *WeakCacheMap[K, V]) Store(key K, value *V) {
 		}
 	}, struct{}{})
 }
+
+func (c *WeakCacheMap[K, V]) Range(f func(K, *V) bool) {
+	c.mu.Lock()
+	snapshot := maps.Clone(c.m)
+	c.mu.Unlock()
+	for k, v := range snapshot {
+		if value := v.Value(); value != nil {
+			if !f(k, value) {
+				break
+			}
+		}
+	}
+}

core/core.go

@@ -20,7 +20,7 @@ import (
 var (
 	Version_x byte = 26
 	Version_y byte = 6
-	Version_z byte = 1
+	Version_z byte = 27
 )
 
 var (

go.mod

@@ -4,7 +4,7 @@ go 1.26
 
 require (
 	github.com/apernet/quic-go v0.59.1-0.20260425001925-6c6cc9bcb716
-	github.com/cloudflare/circl v1.6.3
+	github.com/cloudflare/circl v1.6.4
 	github.com/ghodss/yaml v1.0.1-0.20220118164431-d8423dcdf344
 	github.com/golang/mock v1.7.0-rc.1
 	github.com/google/go-cmp v0.7.0
@@ -12,7 +12,7 @@ require (
 	github.com/klauspost/cpuid/v2 v2.3.0
 	github.com/miekg/dns v1.1.72
 	github.com/pelletier/go-toml v1.9.5
-	github.com/pion/stun/v3 v3.1.5
+	github.com/pion/stun/v3 v3.1.6
 	github.com/pires/go-proxyproto v0.12.0
 	github.com/refraction-networking/utls v1.8.3-0.20260301010127-aa6edf4b11af
 	github.com/robfig/cron/v3 v3.0.1

go.sum

@@ -4,8 +4,8 @@ github.com/apernet/quic-go v0.59.1-0.20260425001925-6c6cc9bcb716 h1:J1O+xpLuJWkd
 github.com/apernet/quic-go v0.59.1-0.20260425001925-6c6cc9bcb716/go.mod h1:Npbg8qBtAZlsAB3FWmqwlVh5jtVG6a4DlYsOylUpvzA=
 github.com/cespare/xxhash/v2 v2.3.0 h1:UL815xU9SqsFlibzuggzjXhog7bL6oX9BbNZnL2UFvs=
 github.com/cespare/xxhash/v2 v2.3.0/go.mod h1:VGX0DQ3Q6kWi7AoAeZDth3/j3BFtOZR5XLFGgcrjCOs=
-github.com/cloudflare/circl v1.6.3 h1:9GPOhQGF9MCYUeXyMYlqTR6a5gTrgR/fBLXvUgtVcg8=
-github.com/cloudflare/circl v1.6.3/go.mod h1:2eXP6Qfat4O/Yhh8BznvKnJ+uzEoTQ6jVKJRn81BiS4=
+github.com/cloudflare/circl v1.6.4 h1:pOXuDTCEYyzydgUpQ0CQz3LsinKjiSk6nNP5Lt5K64U=
+github.com/cloudflare/circl v1.6.4/go.mod h1:YxarevkLlbaHuWsxG6vmYNWBEsSp4pnp7j+4VljMavY=
 github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
@@ -49,8 +49,8 @@ github.com/pion/dtls/v3 v3.1.4 h1:QhvtMflMfu9Kf0RcDC5BJBle4caPskByrKQR6uuYqpY=
 github.com/pion/dtls/v3 v3.1.4/go.mod h1:cr/qotLISUw/9C1m83ZPNZtj9WnXkYLpfCptPqbkInc=
 github.com/pion/logging v0.2.4 h1:tTew+7cmQ+Mc1pTBLKH2puKsOvhm32dROumOZ655zB8=
 github.com/pion/logging v0.2.4/go.mod h1:DffhXTKYdNZU+KtJ5pyQDjvOAh/GsNSyv1lbkFbe3so=
-github.com/pion/stun/v3 v3.1.5 h1:Y1FHlhaI6+4UoC5i/zQf4F7JvdZtB24/05oyy/GF1x8=
-github.com/pion/stun/v3 v3.1.5/go.mod h1:zRUghXSQU32Lx5orJsz3uYMkIihweXb3mu5gIns02fs=
+github.com/pion/stun/v3 v3.1.6 h1:WnhsD0eHCiwCfKNkVx0VJJwr2Y3eV4Ueih3KJ+dfZy8=
+github.com/pion/stun/v3 v3.1.6/go.mod h1:zRUghXSQU32Lx5orJsz3uYMkIihweXb3mu5gIns02fs=
 github.com/pion/transport/v4 v4.0.2 h1:ifYlPqNwsy6aKQ9y8yzxXlHae5431ZrH2avkD/Rn6Tk=
 github.com/pion/transport/v4 v4.0.2/go.mod h1:06hFI+jCFcok2X2MekVufNZ/uzNZXivGBPfviSVcjgM=
 github.com/pires/go-proxyproto v0.12.0 h1:TTCxD66dU898tahivkqc3hoceZp7P44FnorWyo9d5vM=

infra/conf/hysteria.go

@@ -22,7 +22,6 @@ func (c *HysteriaClientConfig) Build() (proto.Message, error) {
 	}
 
 	config := &hysteria.ClientConfig{}
-	config.Version = c.Version
 	config.Server = &protocol.ServerEndpoint{
 		Address: c.Address.Build(),
 		Port:    uint32(c.Port),
@@ -44,6 +43,10 @@ type HysteriaServerConfig struct {
 }
 
 func (c *HysteriaServerConfig) Build() (proto.Message, error) {
+	if c.Version != 2 {
+		return nil, errors.New("version != 2")
+	}
+
 	config := new(hysteria.ServerConfig)
 
 	if c.Clients != nil {

infra/conf/loopback.go

@@ -1,14 +1,24 @@
 package conf
 
 import (
+	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/proxy/loopback"
 	"google.golang.org/protobuf/proto"
 )
 
 type LoopbackConfig struct {
-	InboundTag string `json:"inboundTag"`
+	InboundTag string          `json:"inboundTag"`
+	Sniffing   *SniffingConfig `json:"sniffing"`
 }
 
 func (l LoopbackConfig) Build() (proto.Message, error) {
-	return &loopback.Config{InboundTag: l.InboundTag}, nil
+	c := &loopback.Config{InboundTag: l.InboundTag}
+	if l.Sniffing != nil {
+		sc, err := l.Sniffing.Build()
+		if err != nil {
+			return nil, errors.New("failed to build sniffing config").Base(err)
+		}
+		c.Sniffing = sc
+	}
+	return c, nil
 }

infra/conf/transport_internet.go

@@ -404,8 +404,8 @@ func (c *SplitHTTPConfig) Build() (proto.Message, error) {
 		return nil, errors.New("maxConnections cannot be specified together with maxConcurrency")
 	}
 	if c.Xmux == (XmuxConfig{}) {
-		c.Xmux.MaxConcurrency.From = 1
-		c.Xmux.MaxConcurrency.To = 1
+		c.Xmux.MaxConnections.From = 6
+		c.Xmux.MaxConnections.To = 6
 		c.Xmux.HMaxRequestTimes.From = 600
 		c.Xmux.HMaxRequestTimes.To = 900
 		c.Xmux.HMaxReusableSecs.From = 1800
@@ -571,7 +571,6 @@ func (c *HysteriaConfig) Build() (proto.Message, error) {
 	}
 
 	config := &hysteria.Config{}
-	config.Version = c.Version
 	config.Auth = c.Auth
 	config.UdpIdleTimeout = c.UdpIdleTimeout
 	config.MasqType = c.Masquerade.Type
@@ -1409,10 +1408,12 @@ func (c *HeaderCustomTCP) Build() (proto.Message, error) {
 }
 
 type FragmentMask struct {
-	Packets  string     `json:"packets"`
-	Length   Int32Range `json:"length"`
-	Delay    Int32Range `json:"delay"`
-	MaxSplit Int32Range `json:"maxSplit"`
+	Packets  string       `json:"packets"`
+	Length   Int32Range   `json:"length"`
+	Delay    Int32Range   `json:"delay"`
+	Lengths  []Int32Range `json:"lengths"`
+	Delays   []Int32Range `json:"delays"`
+	MaxSplit Int32Range   `json:"maxSplit"`
 }
 
 func (c *FragmentMask) Build() (proto.Message, error) {
@@ -1437,14 +1438,29 @@ func (c *FragmentMask) Build() (proto.Message, error) {
 		}
 	}
 
-	config.LengthMin = int64(c.Length.From)
-	config.LengthMax = int64(c.Length.To)
-	if config.LengthMin == 0 {
-		return nil, errors.New("LengthMin can't be 0")
+	if len(c.Lengths) > 0 {
+		for _, r := range c.Lengths {
+			config.LengthsMin = append(config.LengthsMin, int64(r.From))
+			config.LengthsMax = append(config.LengthsMax, int64(r.To))
+		}
+	} else {
+		config.LengthsMin = append(config.LengthsMin, int64(c.Length.From))
+		config.LengthsMax = append(config.LengthsMax, int64(c.Length.To))
 	}
 
-	config.DelayMin = int64(c.Delay.From)
-	config.DelayMax = int64(c.Delay.To)
+	if config.LengthsMin[len(config.LengthsMin)-1] == 0 {
+		return nil, errors.New("last lengths entry min can't be 0")
+	}
+
+	if len(c.Delays) > 0 {
+		for _, r := range c.Delays {
+			config.DelaysMin = append(config.DelaysMin, int64(r.From))
+			config.DelaysMax = append(config.DelaysMax, int64(r.To))
+		}
+	} else {
+		config.DelaysMin = append(config.DelaysMin, int64(c.Delay.From))
+		config.DelaysMax = append(config.DelaysMax, int64(c.Delay.To))
+	}
 
 	config.MaxSplitMin = int64(c.MaxSplit.From)
 	config.MaxSplitMax = int64(c.MaxSplit.To)
@@ -1788,12 +1804,15 @@ func (c *MkcpLegacy) Build() (proto.Message, error) {
 }
 
 type Salamander struct {
-	Password   string      `json:"password"`
-	PacketSize *Int32Range `json:"packetSize"`
+	Password   string     `json:"password"`
+	PacketSize Int32Range `json:"packetSize"`
 }
 
 func (c *Salamander) Build() (proto.Message, error) {
-	if c.PacketSize != nil {
+	if c.PacketSize.To > 0 {
+		if c.PacketSize.From <= 0 || c.PacketSize.To > 2048 {
+			return nil, errors.New("gecko: invalid min/max packet size")
+		}
 		return &salamander.GeckoConfig{
 			Password:      c.Password,
 			MinPacketSize: c.PacketSize.From,

infra/conf/wireguard.go

@@ -7,6 +7,9 @@ import (
 	"strings"
 
 	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/protocol"
+	"github.com/xtls/xray-core/common/serial"
+	"github.com/xtls/xray-core/common/task"
 	"github.com/xtls/xray-core/proxy/wireguard"
 	"google.golang.org/protobuf/proto"
 )
@@ -17,9 +20,12 @@ type WireGuardPeerConfig struct {
 	Endpoint     string   `json:"endpoint"`
 	KeepAlive    uint32   `json:"keepAlive"`
 	AllowedIPs   []string `json:"allowedIPs,omitempty"`
+
+	Level uint32 `json:"level"`
+	Email string `json:"email"`
 }
 
-func (c *WireGuardPeerConfig) Build() (proto.Message, error) {
+func (c *WireGuardPeerConfig) Build() (*wireguard.PeerConfig, error) {
 	var err error
 	config := new(wireguard.PeerConfig)
 
@@ -78,14 +84,32 @@ func (c *WireGuardConfig) Build() (proto.Message, error) {
 		config.Endpoint = c.Address
 	}
 
-	if c.Peers != nil {
+	if c.IsClient {
 		config.Peers = make([]*wireguard.PeerConfig, len(c.Peers))
 		for i, p := range c.Peers {
 			msg, err := p.Build()
 			if err != nil {
 				return nil, err
 			}
-			config.Peers[i] = msg.(*wireguard.PeerConfig)
+			config.Peers[i] = msg
+		}
+	} else {
+		config.Users = make([]*protocol.User, len(c.Peers))
+		processUser := func(idx int) error {
+			p := c.Peers[idx]
+			m, err := p.Build()
+			if err != nil {
+				return err
+			}
+			config.Users[idx] = &protocol.User{
+				Email:   p.Email,
+				Level:   p.Level,
+				Account: serial.ToTypedMessage(m),
+			}
+			return nil
+		}
+		if err := task.ParallelForN(len(c.Peers), processUser); err != nil {
+			return nil, err
 		}
 	}
 

infra/conf/wireguard_test.go

@@ -1,50 +0,0 @@
-package conf_test
-
-import (
-	"testing"
-
-	. "github.com/xtls/xray-core/infra/conf"
-	"github.com/xtls/xray-core/proxy/wireguard"
-)
-
-func TestWireGuardConfig(t *testing.T) {
-	creator := func() Buildable {
-		return new(WireGuardConfig)
-	}
-
-	runMultiTestCase(t, []TestCase{
-		{
-			Input: `{
-				"secretKey": "uJv5tZMDltsiYEn+kUwb0Ll/CXWhMkaSCWWhfPEZM3A=",
-				"address": ["10.1.1.1", "fd59:7153:2388:b5fd:0000:0000:1234:0001"],
-				"peers": [
-					{
-						"publicKey": "6e65ce0be17517110c17d77288ad87e7fd5252dcc7d09b95a39d61db03df832a",
-						"endpoint": "127.0.0.1:1234"
-					}
-				],
-				"mtu": 1300,
-				"workers": 2,
-				"domainStrategy": "ForceIPv6v4",
-				"noKernelTun": false
-			}`,
-			Parser: loadJSON(creator),
-			Output: &wireguard.DeviceConfig{
-				// key converted into hex form
-				SecretKey: "b89bf9b5930396db226049fe914c1bd0b97f0975a13246920965a17cf1193370",
-				Endpoint:  []string{"10.1.1.1", "fd59:7153:2388:b5fd:0000:0000:1234:0001"},
-				Peers: []*wireguard.PeerConfig{
-					{
-						// also can read from hex form directly
-						PublicKey:  "6e65ce0be17517110c17d77288ad87e7fd5252dcc7d09b95a39d61db03df832a",
-						Endpoint:   "127.0.0.1:1234",
-						AllowedIps: []string{"0.0.0.0/0", "::0/0"},
-					},
-				},
-				Mtu:            1300,
-				DomainStrategy: wireguard.DeviceConfig_FORCE_IP64,
-				NoKernelTun:    false,
-			},
-		},
-	})
-}

infra/conf/xray.go

@@ -173,27 +173,6 @@ func (c *InboundDetourConfig) Build() (*core.InboundHandlerConfig, error) {
 			return nil, err
 		}
 		receiverSettings.StreamSettings = ss
-		// TODO: Actually implement this breaking change
-		protocol := ss.GetEffectiveProtocol()
-		if (protocol == "websocket" || protocol == "httpupgrade" || protocol == "splithttp") &&
-			(c.StreamSetting.SocketSettings == nil || len(c.StreamSetting.SocketSettings.TrustedXForwardedFor) == 0) {
-			errors.LogWarning(
-				context.Background(),
-				`====== SECURITY WARNING ======`,
-				"\n",
-				`inbound "`, c.Tag, `" using `, protocol, ` has not configured "sockopt.trustedXForwardedFor".`,
-				"\n",
-				`THIS IS VERY INSECURE!!!`,
-				"\n",
-				`For compatibility, Xray still allows this for now and still trusts X-Forwarded-For implicitly.`,
-				"\n",
-				`Please configure "sockopt.trustedXForwardedFor" immediately.`,
-				"\n",
-				`In future versions, this option must be explicitly set.`,
-				"\n",
-				`====== SECURITY WARNING ======`,
-			)
-		}
 		if strings.Contains(ss.SecurityType, "reality") && (receiverSettings.PortList == nil ||
 			len(receiverSettings.PortList.Ports()) != 1 || receiverSettings.PortList.Ports()[0] != 443) {
 			errors.LogWarning(context.Background(), `REALITY: Listening on non-443 ports may get your IP blocked by the GFW`)

proxy/hysteria/account/config.go

@@ -3,25 +3,32 @@ package account
 import (
 	"sync"
 
-	"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/uuid"
 
 	"google.golang.org/protobuf/proto"
 )
 
 func (a *Account) AsAccount() (protocol.Account, error) {
+	var VR net.Port
+	if id, err := uuid.ParseString(a.Auth); err == nil {
+		VR = net.PortFromBytes(id[6:8])
+	}
 	return &MemoryAccount{
 		Auth: a.Auth,
+		VR:   VR,
 	}, nil
 }
 
 type MemoryAccount struct {
 	Auth string
+	VR   net.Port
 }
 
-func (a *MemoryAccount) Equals(another protocol.Account) bool {
-	if account, ok := another.(*MemoryAccount); ok {
-		return a.Auth == account.Auth
+func (a *MemoryAccount) Equals(other protocol.Account) bool {
+	if b, ok := other.(*MemoryAccount); ok {
+		return a.Auth == b.Auth
 	}
 	return false
 }
@@ -33,97 +40,63 @@ func (a *MemoryAccount) ToProto() proto.Message {
 }
 
 type Validator struct {
-	emails map[string]struct{}
-	users  map[string]*protocol.MemoryUser
-
-	mutex sync.Mutex
+	users sync.Map
 }
 
 func NewValidator() *Validator {
-	return &Validator{
-		emails: make(map[string]struct{}),
-		users:  make(map[string]*protocol.MemoryUser),
-	}
+	return &Validator{}
 }
 
-func (v *Validator) Add(u *protocol.MemoryUser) error {
-	v.mutex.Lock()
-	defer v.mutex.Unlock()
-
-	if u.Email != "" {
-		if _, ok := v.emails[u.Email]; ok {
-			return errors.New("User ", u.Email, " already exists.")
-		}
-		v.emails[u.Email] = struct{}{}
-	}
-	v.users[u.Account.(*MemoryAccount).Auth] = u
-
+func (v *Validator) Add(user *protocol.MemoryUser) error {
+	v.users.Store(user.Account.(*MemoryAccount).Auth, user)
 	return nil
 }
 
-func (v *Validator) Del(email string) error {
-	if email == "" {
-		return errors.New("Email must not be empty.")
+func (v *Validator) DelByEmail(email string) error {
+	if user := v.GetByEmail(email); user != nil {
+		v.users.Delete(user.Account.(*MemoryAccount).Auth)
 	}
-
-	v.mutex.Lock()
-	defer v.mutex.Unlock()
-
-	if _, ok := v.emails[email]; !ok {
-		return errors.New("User ", email, " not found.")
-	}
-	delete(v.emails, email)
-	for key, user := range v.users {
-		if user.Email == email {
-			delete(v.users, key)
-			break
-		}
-	}
-
 	return nil
 }
 
 func (v *Validator) Get(auth string) *protocol.MemoryUser {
-	v.mutex.Lock()
-	defer v.mutex.Unlock()
-
-	return v.users[auth]
-}
-
-func (v *Validator) GetByEmail(email string) *protocol.MemoryUser {
-	if email == "" {
-		return nil
+	if value, ok := v.users.Load(auth); ok {
+		return value.(*protocol.MemoryUser)
 	}
-
-	v.mutex.Lock()
-	defer v.mutex.Unlock()
-
-	if _, ok := v.emails[email]; ok {
-		for _, user := range v.users {
-			if user.Email == email {
-				return user
-			}
-		}
-	}
-
 	return nil
 }
 
-func (v *Validator) GetAll() []*protocol.MemoryUser {
-	v.mutex.Lock()
-	defer v.mutex.Unlock()
-
-	users := make([]*protocol.MemoryUser, 0, len(v.users))
-	for _, user := range v.users {
-		users = append(users, user)
-	}
-
-	return users
+func (v *Validator) GetByEmail(email string) (user *protocol.MemoryUser) {
+	v.users.Range(func(key, value any) bool {
+		if value.(*protocol.MemoryUser).Email == email {
+			user = value.(*protocol.MemoryUser)
+			return false
+		}
+		return true
+	})
+	return
 }
 
-func (v *Validator) GetCount() int64 {
-	v.mutex.Lock()
-	defer v.mutex.Unlock()
-
-	return int64(len(v.users))
+func (v *Validator) GetAll() (users []*protocol.MemoryUser) {
+	v.users.Range(func(key, value any) bool {
+		users = append(users, value.(*protocol.MemoryUser))
+		return true
+	})
+	return
+}
+
+func (v *Validator) GetCount() (count int64) {
+	v.users.Range(func(key, value any) bool {
+		count++
+		return true
+	})
+	return
+}
+
+func (v *Validator) NotEmpty() (not_empty bool) {
+	v.users.Range(func(key, value any) bool {
+		not_empty = true
+		return false
+	})
+	return
 }

proxy/hysteria/config.pb.go

@@ -24,8 +24,7 @@ const (
 
 type ClientConfig struct {
 	state         protoimpl.MessageState   `protogen:"open.v1"`
-	Version       int32                    `protobuf:"varint,1,opt,name=version,proto3" json:"version,omitempty"`
-	Server        *protocol.ServerEndpoint `protobuf:"bytes,2,opt,name=server,proto3" json:"server,omitempty"`
+	Server        *protocol.ServerEndpoint `protobuf:"bytes,1,opt,name=server,proto3" json:"server,omitempty"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
 }
@@ -60,13 +59,6 @@ func (*ClientConfig) Descriptor() ([]byte, []int) {
 	return file_proxy_hysteria_config_proto_rawDescGZIP(), []int{0}
 }
 
-func (x *ClientConfig) GetVersion() int32 {
-	if x != nil {
-		return x.Version
-	}
-	return 0
-}
-
 func (x *ClientConfig) GetServer() *protocol.ServerEndpoint {
 	if x != nil {
 		return x.Server
@@ -122,10 +114,9 @@ var File_proxy_hysteria_config_proto protoreflect.FileDescriptor
 
 const file_proxy_hysteria_config_proto_rawDesc = "" +
 	"\n" +
-	"\x1bproxy/hysteria/config.proto\x12\x13xray.proxy.hysteria\x1a!common/protocol/server_spec.proto\x1a\x1acommon/protocol/user.proto\"f\n" +
-	"\fClientConfig\x12\x18\n" +
-	"\aversion\x18\x01 \x01(\x05R\aversion\x12<\n" +
-	"\x06server\x18\x02 \x01(\v2$.xray.common.protocol.ServerEndpointR\x06server\"@\n" +
+	"\x1bproxy/hysteria/config.proto\x12\x13xray.proxy.hysteria\x1a!common/protocol/server_spec.proto\x1a\x1acommon/protocol/user.proto\"L\n" +
+	"\fClientConfig\x12<\n" +
+	"\x06server\x18\x01 \x01(\v2$.xray.common.protocol.ServerEndpointR\x06server\"@\n" +
 	"\fServerConfig\x120\n" +
 	"\x05users\x18\x01 \x03(\v2\x1a.xray.common.protocol.UserR\x05usersB[\n" +
 	"\x17com.xray.proxy.hysteriaP\x01Z(github.com/xtls/xray-core/proxy/hysteria\xaa\x02\x13Xray.Proxy.Hysteriab\x06proto3"

proxy/hysteria/config.proto

@@ -10,8 +10,7 @@ import "common/protocol/server_spec.proto";
 import "common/protocol/user.proto";
 
 message ClientConfig {
-  int32 version = 1;
-  xray.common.protocol.ServerEndpoint server = 2;
+  xray.common.protocol.ServerEndpoint server = 1;
 }
 
 message ServerConfig {

proxy/hysteria/server.go

@@ -59,12 +59,12 @@ func (s *Server) HysteriaInboundValidator() *account.Validator {
 	return s.validator
 }
 
-func (s *Server) AddUser(ctx context.Context, u *protocol.MemoryUser) error {
-	return s.validator.Add(u)
+func (s *Server) AddUser(ctx context.Context, user *protocol.MemoryUser) error {
+	return s.validator.Add(user)
 }
 
-func (s *Server) RemoveUser(ctx context.Context, e string) error {
-	return s.validator.Del(e)
+func (s *Server) RemoveUser(ctx context.Context, email string) error {
+	return s.validator.DelByEmail(email)
 }
 
 func (s *Server) GetUser(ctx context.Context, email string) *protocol.MemoryUser {
@@ -91,9 +91,12 @@ func (s *Server) Process(ctx context.Context, network net.Network, conn stat.Con
 
 	iConn := stat.TryUnwrapStatsConn(conn)
 
-	type User interface{ User() *protocol.MemoryUser }
-	if v, ok := iConn.(User); ok && v.User() != nil {
-		inbound.User = v.User()
+	if v, ok := iConn.(interface{ User() *protocol.MemoryUser }); ok {
+		user := v.User()
+		if user != nil {
+			inbound.User = user
+			inbound.VlessRoute = user.Account.(*account.MemoryAccount).VR
+		}
 	}
 
 	if _, ok := iConn.(*hysteria.InterConn); ok {

proxy/loopback/config.pb.go

@@ -7,6 +7,7 @@
 package loopback
 
 import (
+	proxyman "github.com/xtls/xray-core/app/proxyman"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -22,8 +23,9 @@ const (
 )
 
 type Config struct {
-	state         protoimpl.MessageState `protogen:"open.v1"`
-	InboundTag    string                 `protobuf:"bytes,1,opt,name=inbound_tag,json=inboundTag,proto3" json:"inbound_tag,omitempty"`
+	state         protoimpl.MessageState   `protogen:"open.v1"`
+	InboundTag    string                   `protobuf:"bytes,1,opt,name=inbound_tag,json=inboundTag,proto3" json:"inbound_tag,omitempty"`
+	Sniffing      *proxyman.SniffingConfig `protobuf:"bytes,2,opt,name=sniffing,proto3" json:"sniffing,omitempty"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
 }
@@ -65,14 +67,22 @@ func (x *Config) GetInboundTag() string {
 	return ""
 }
 
+func (x *Config) GetSniffing() *proxyman.SniffingConfig {
+	if x != nil {
+		return x.Sniffing
+	}
+	return nil
+}
+
 var File_proxy_loopback_config_proto protoreflect.FileDescriptor
 
 const file_proxy_loopback_config_proto_rawDesc = "" +
 	"\n" +
-	"\x1bproxy/loopback/config.proto\x12\x13xray.proxy.loopback\")\n" +
+	"\x1bproxy/loopback/config.proto\x12\x13xray.proxy.loopback\x1a\x19app/proxyman/config.proto\"h\n" +
 	"\x06Config\x12\x1f\n" +
 	"\vinbound_tag\x18\x01 \x01(\tR\n" +
-	"inboundTagB[\n" +
+	"inboundTag\x12=\n" +
+	"\bsniffing\x18\x02 \x01(\v2!.xray.app.proxyman.SniffingConfigR\bsniffingB[\n" +
 	"\x17com.xray.proxy.loopbackP\x01Z(github.com/xtls/xray-core/proxy/loopback\xaa\x02\x13Xray.Proxy.Loopbackb\x06proto3"
 
 var (
@@ -89,14 +99,16 @@ func file_proxy_loopback_config_proto_rawDescGZIP() []byte {
 
 var file_proxy_loopback_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
 var file_proxy_loopback_config_proto_goTypes = []any{
-	(*Config)(nil), // 0: xray.proxy.loopback.Config
+	(*Config)(nil),                  // 0: xray.proxy.loopback.Config
+	(*proxyman.SniffingConfig)(nil), // 1: xray.app.proxyman.SniffingConfig
 }
 var file_proxy_loopback_config_proto_depIdxs = []int32{
-	0, // [0:0] is the sub-list for method output_type
-	0, // [0:0] is the sub-list for method input_type
-	0, // [0:0] is the sub-list for extension type_name
-	0, // [0:0] is the sub-list for extension extendee
-	0, // [0:0] is the sub-list for field type_name
+	1, // 0: xray.proxy.loopback.Config.sniffing:type_name -> xray.app.proxyman.SniffingConfig
+	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
 }
 
 func init() { file_proxy_loopback_config_proto_init() }

proxy/loopback/config.proto

@@ -6,6 +6,9 @@ option go_package = "github.com/xtls/xray-core/proxy/loopback";
 option java_package = "com.xray.proxy.loopback";
 option java_multiple_files = true;
 
+import "app/proxyman/config.proto";
+
 message Config {
   string inbound_tag = 1;
+  xray.app.proxyman.SniffingConfig sniffing = 2;
 }

proxy/loopback/loopback.go

@@ -3,6 +3,7 @@ package loopback
 import (
 	"context"
 
+	proxyman "github.com/xtls/xray-core/app/proxyman"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/session"
@@ -13,7 +14,8 @@ import (
 )
 
 type Loopback struct {
-	config             *Config
+	inboundTag         string
+	sniffingRequest    session.SniffingRequest
 	dispatcherInstance routing.Dispatcher
 }
 
@@ -29,6 +31,7 @@ func (l *Loopback) Process(ctx context.Context, link *transport.Link, _ internet
 	errors.LogInfo(ctx, "opening connection to ", destination)
 	content := new(session.Content)
 	content.SkipDNSResolve = true
+	content.SniffingRequest = l.sniffingRequest
 
 	ctx = session.ContextWithContent(ctx, content)
 	inbound := &session.Inbound{}
@@ -37,20 +40,26 @@ func (l *Loopback) Process(ctx context.Context, link *transport.Link, _ internet
 		// get a shallow copy to avoid modifying the inbound tag in upstream context
 		*inbound = *originInbound
 	}
-	inbound.Tag = l.config.InboundTag
+	inbound.Tag = l.inboundTag
 	ctx = session.ContextWithInbound(ctx, inbound)
 
 	err := l.dispatcherInstance.DispatchLink(ctx, destination, link)
 	if err != nil {
-		errors.New(ctx, "failed to process loopback connection").Base(err)
-		return err
+		return errors.New(ctx, "failed to process loopback connection").Base(err)
 	}
 	return nil
 }
 
 func (l *Loopback) init(config *Config, dispatcherInstance routing.Dispatcher) error {
 	l.dispatcherInstance = dispatcherInstance
-	l.config = config
+	l.inboundTag = config.InboundTag
+	if config.Sniffing.GetEnabled() {
+		request, err := proxyman.BuildSniffingRequest(config.Sniffing)
+		if err != nil {
+			return errors.New("failed to build loopback sniffing request").Base(err).AtError()
+		}
+		l.sniffingRequest = request
+	}
 	return nil
 }
 

proxy/tun/config.go

@@ -3,8 +3,6 @@ package tun
 import (
 	"context"
 	"net"
-	"sort"
-	"strings"
 	"sync"
 
 	"github.com/xtls/xray-core/common/errors"
@@ -31,95 +29,23 @@ func (updater *InterfaceUpdater) Update() {
 	updater.Lock()
 	defer updater.Unlock()
 
-	if updater.iface != nil {
-		iface, err := net.InterfaceByIndex(updater.iface.Index)
-		if err == nil && iface.Name == updater.iface.Name {
-			return
-		}
-	}
-
-	updater.iface = nil
-
-	interfaces, err := net.Interfaces()
+	got, err := findOutboundInterface(updater.tunIndex, updater.fixedName)
 	if err != nil {
 		errors.LogInfoInner(context.Background(), err, "[tun] failed to update interface")
+		updater.iface = nil
 		return
 	}
 
-	var got *net.Interface
-	if updater.fixedName != "" {
-		for _, iface := range interfaces {
-			if iface.Index == updater.tunIndex {
-				continue
-			}
-			if iface.Name == updater.fixedName {
-				got = &iface
-				break
-			}
-		}
-	} else {
-		var ifs []struct {
-			index int
-			score int
-		}
-		for i, iface := range interfaces {
-			if iface.Index == updater.tunIndex {
-				continue
-			}
-			if strings.Contains(iface.Name, "vEthernet") {
-				continue
-			}
-			if iface.Flags&net.FlagUp == 0 {
-				continue
-			}
-			if iface.Flags&net.FlagLoopback != 0 {
-				continue
-			}
-			addrs, err := iface.Addrs()
-			if err != nil || len(addrs) == 0 {
-				continue
-			}
-			ifs = append(ifs, struct {
-				index int
-				score int
-			}{i, score(&iface, addrs)})
-		}
-		sort.Slice(ifs, func(i, j int) bool {
-			if ifs[i].score != ifs[j].score {
-				return ifs[i].score > ifs[j].score
-			}
-
-			return interfaces[ifs[i].index].Name < interfaces[ifs[j].index].Name
-		})
-		if len(ifs) > 0 {
-			iface := interfaces[ifs[0].index]
-			got = &iface
-		}
-	}
-
 	if got == nil {
 		errors.LogInfo(context.Background(), "[tun] failed to update interface > got == nil")
+		updater.iface = nil
+		return
+	}
+
+	if updater.iface != nil && updater.iface.Index == got.Index && updater.iface.Name == got.Name {
 		return
 	}
 
 	updater.iface = got
 	errors.LogInfo(context.Background(), "[tun] update interface ", got.Name, " ", got.Index)
 }
-
-func score(iface *net.Interface, addrs []net.Addr) int {
-	score := 0
-
-	name := strings.ToLower(iface.Name)
-	if strings.Contains(name, "wlan") || strings.Contains(name, "wi-fi") {
-		score += 2
-	}
-
-	for _, addr := range addrs {
-		if strings.HasPrefix(addr.String(), "192.168.") {
-			score += 1
-			break
-		}
-	}
-
-	return score
-}

proxy/tun/handler.go

@@ -17,6 +17,7 @@ import (
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/policy"
 	"github.com/xtls/xray-core/features/routing"
+	"github.com/xtls/xray-core/features/stats"
 	"github.com/xtls/xray-core/transport"
 	"github.com/xtls/xray-core/transport/internet"
 	"github.com/xtls/xray-core/transport/internet/stat"
@@ -32,6 +33,8 @@ type Handler struct {
 	dispatcher      routing.Dispatcher
 	tag             string
 	sniffingRequest session.SniffingRequest
+	uplinkCounter   stats.Counter
+	downlinkCounter stats.Counter
 }
 
 // ConnectionHandler interface with the only method that stack is going to push new connections to
@@ -59,6 +62,23 @@ func (t *Handler) Init(ctx context.Context, pm policy.Manager, dispatcher routin
 	t.policyManager = pm
 	t.dispatcher = dispatcher
 
+	if len(t.tag) > 0 && pm.ForSystem().Stats.InboundUplink {
+		statsManager := core.MustFromContext(ctx).GetFeature(stats.ManagerType()).(stats.Manager)
+		name := "inbound>>>" + t.tag + ">>>traffic>>>uplink"
+		c, _ := stats.GetOrRegisterCounter(statsManager, name)
+		if c != nil {
+			t.uplinkCounter = c
+		}
+	}
+	if len(t.tag) > 0 && pm.ForSystem().Stats.InboundDownlink {
+		statsManager := core.MustFromContext(ctx).GetFeature(stats.ManagerType()).(stats.Manager)
+		name := "inbound>>>" + t.tag + ">>>traffic>>>downlink"
+		c, _ := stats.GetOrRegisterCounter(statsManager, name)
+		if c != nil {
+			t.downlinkCounter = c
+		}
+	}
+
 	return nil
 }
 
@@ -143,7 +163,22 @@ func (t *Handler) HandleConnection(conn net.Conn, destination net.Destination) {
 	defer cancel()
 	ctx = c.ContextWithID(ctx, session.NewID())
 
-	source := net.DestinationFromAddr(conn.RemoteAddr())
+	// if the connection is already closed, conn.RemoteAddr() will be nil
+	// due to gvisor weird behavior
+	remote := conn.RemoteAddr()
+	if remote == nil {
+		errors.LogInfo(t.ctx, "dropped quickly closed connection")
+		return
+	}
+	source := net.DestinationFromAddr(remote)
+	if t.uplinkCounter != nil || t.downlinkCounter != nil {
+		conn = &stat.CounterConnection{
+			Connection:   conn,
+			ReadCounter:  t.uplinkCounter,
+			WriteCounter: t.downlinkCounter,
+		}
+	}
+
 	inbound := session.Inbound{
 		Name:          "tun",
 		Tag:           t.tag,

proxy/tun/handler_test.go

@@ -0,0 +1,133 @@
+package tun
+
+import (
+	"bytes"
+	"context"
+	"net"
+	"sync/atomic"
+	"testing"
+	"time"
+
+	"github.com/xtls/xray-core/common/buf"
+	xnet "github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/features/routing"
+	"github.com/xtls/xray-core/transport"
+)
+
+type testCounter struct {
+	value int64
+}
+
+func (c *testCounter) Value() int64 {
+	return atomic.LoadInt64(&c.value)
+}
+
+func (c *testCounter) Set(value int64) int64 {
+	return atomic.SwapInt64(&c.value, value)
+}
+
+func (c *testCounter) Add(value int64) int64 {
+	return atomic.AddInt64(&c.value, value) - value
+}
+
+type testConn struct {
+	reader *bytes.Reader
+	writer bytes.Buffer
+}
+
+func newTestConn(input []byte) *testConn {
+	return &testConn{reader: bytes.NewReader(input)}
+}
+
+func (c *testConn) Read(payload []byte) (int, error) {
+	return c.reader.Read(payload)
+}
+
+func (c *testConn) Write(payload []byte) (int, error) {
+	return c.writer.Write(payload)
+}
+
+func (c *testConn) Close() error {
+	return nil
+}
+
+func (c *testConn) LocalAddr() net.Addr {
+	return &net.TCPAddr{IP: net.IPv4(10, 0, 0, 1), Port: 1080}
+}
+
+func (c *testConn) RemoteAddr() net.Addr {
+	return &net.TCPAddr{IP: net.IPv4(10, 0, 0, 2), Port: 12345}
+}
+
+func (c *testConn) SetDeadline(time.Time) error {
+	return nil
+}
+
+func (c *testConn) SetReadDeadline(time.Time) error {
+	return nil
+}
+
+func (c *testConn) SetWriteDeadline(time.Time) error {
+	return nil
+}
+
+type testDispatcher struct {
+	writePayload []byte
+	readBytes    int32
+}
+
+func (d *testDispatcher) Type() interface{} {
+	return routing.DispatcherType()
+}
+
+func (d *testDispatcher) Start() error {
+	return nil
+}
+
+func (d *testDispatcher) Close() error {
+	return nil
+}
+
+func (d *testDispatcher) Dispatch(context.Context, xnet.Destination) (*transport.Link, error) {
+	return nil, nil
+}
+
+func (d *testDispatcher) DispatchLink(ctx context.Context, dest xnet.Destination, link *transport.Link) error {
+	mb, err := link.Reader.ReadMultiBuffer()
+	if err != nil {
+		return err
+	}
+	atomic.StoreInt32(&d.readBytes, mb.Len())
+	buf.ReleaseMulti(mb)
+
+	return link.Writer.WriteMultiBuffer(buf.MultiBuffer{buf.FromBytes(d.writePayload)})
+}
+
+func TestHandlerCountsTunConnectionTraffic(t *testing.T) {
+	uplinkCounter := new(testCounter)
+	downlinkCounter := new(testCounter)
+	dispatcher := &testDispatcher{writePayload: []byte("downlink")}
+	conn := newTestConn([]byte("uplink"))
+
+	handler := &Handler{
+		ctx:             context.Background(),
+		config:          &Config{},
+		dispatcher:      dispatcher,
+		uplinkCounter:   uplinkCounter,
+		downlinkCounter: downlinkCounter,
+	}
+	handler.HandleConnection(conn, xnet.TCPDestination(xnet.LocalHostIP, 443))
+
+	if got := uplinkCounter.Value(); got != int64(len("uplink")) {
+		t.Fatalf("unexpected uplink counter: got %d, want %d", got, len("uplink"))
+	}
+	if got := downlinkCounter.Value(); got != int64(len("downlink")) {
+		t.Fatalf("unexpected downlink counter: got %d, want %d", got, len("downlink"))
+	}
+	if got := int(atomic.LoadInt32(&dispatcher.readBytes)); got != len("uplink") {
+		t.Fatalf("dispatcher read unexpected bytes: got %d, want %d", got, len("uplink"))
+	}
+	if got := conn.writer.String(); got != "downlink" {
+		t.Fatalf("connection write mismatch: got %q, want %q", got, "downlink")
+	}
+}

proxy/tun/tun_android.go

@@ -81,3 +81,17 @@ func (t *AndroidTun) newEndpoint() (stack.LinkEndpoint, error) {
 func setinterface(network, address string, fd uintptr, iface *net.Interface) error {
 	return unix.BindToDevice(int(fd), iface.Name)
 }
+
+func findOutboundInterface(tunIndex int, fixedName string) (*net.Interface, error) {
+	if fixedName == "" {
+		return nil, errors.New("automatic outbound interface selection is not supported on this platform")
+	}
+	iface, err := net.InterfaceByName(fixedName)
+	if err != nil {
+		return nil, err
+	}
+	if iface.Index == tunIndex {
+		return nil, errors.New("outbound interface cannot be the TUN interface")
+	}
+	return iface, nil
+}

proxy/tun/tun_darwin.go

@@ -3,16 +3,20 @@
 package tun
 
 import (
+	"context"
 	"errors"
 	"fmt"
 	"net"
 	"net/netip"
 	"os"
 	"strconv"
+	"sync"
 	"unsafe"
 
 	"github.com/xtls/xray-core/common/buf"
+	xerrors "github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/platform"
+	"golang.org/x/net/route"
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/buffer"
 	"gvisor.dev/gvisor/pkg/tcpip"
@@ -42,6 +46,10 @@ type DarwinTun struct {
 	options *Config
 	tunFd   int
 	ownsFd  bool // true for macOS (we created the fd), false for iOS (fd from system)
+
+	routeMonitor     *os.File
+	routeMonitorOnce sync.Once
+	systemRoutes     []netip.Prefix
 }
 
 var (
@@ -92,15 +100,53 @@ func NewTun(options *Config) (Tun, error) {
 }
 
 func (t *DarwinTun) Start() error {
+	if !t.ownsFd {
+		return nil
+	}
+
+	if err := t.setSystemRoutes(); err != nil {
+		return err
+	}
+
+	if updater != nil {
+		fd, err := unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, 0)
+		if err != nil {
+			_ = t.unsetSystemRoutes()
+			return err
+		}
+		t.routeMonitor = os.NewFile(uintptr(fd), "xray-route-monitor")
+		go t.monitorRouteChanges()
+	}
 	return nil
 }
 
 func (t *DarwinTun) Close() error {
+	t.routeMonitorOnce.Do(func() {
+		if t.routeMonitor != nil {
+			_ = t.routeMonitor.Close()
+		}
+	})
+	routeErr := t.unsetSystemRoutes()
 	if t.ownsFd {
-		return t.tunFile.Close()
+		return xerrors.Combine(routeErr, t.tunFile.Close())
 	}
 	// iOS: don't close the fd, it's owned by NetworkExtension
-	return nil
+	return routeErr
+}
+
+func (t *DarwinTun) monitorRouteChanges() {
+	buffer := make([]byte, 64*1024)
+	for {
+		if _, err := t.routeMonitor.Read(buffer); err != nil {
+			if !errors.Is(err, os.ErrClosed) {
+				xerrors.LogInfoInner(context.Background(), err, "[tun] failed to monitor route changes")
+			}
+			return
+		}
+		if updater != nil {
+			updater.Update()
+		}
+	}
 }
 
 func (t *DarwinTun) Name() (string, error) {
@@ -388,3 +434,227 @@ func setinterface(network, address string, fd uintptr, iface *net.Interface) err
 
 	return errors.Join(err1, err2)
 }
+
+func findOutboundInterface(tunIndex int, fixedName string) (*net.Interface, error) {
+	if fixedName != "" {
+		iface, err := net.InterfaceByName(fixedName)
+		if err != nil {
+			return nil, err
+		}
+		if iface.Index == tunIndex {
+			return nil, errors.New("outbound interface cannot be the TUN interface")
+		}
+		return iface, nil
+	}
+
+	rib, err := route.FetchRIB(unix.AF_UNSPEC, route.RIBTypeRoute, 0)
+	if err != nil {
+		return nil, err
+	}
+	messages, err := route.ParseRIB(route.RIBTypeRoute, rib)
+	if err != nil {
+		return nil, err
+	}
+
+	var ipv6Index int
+	for _, message := range messages {
+		routeMessage, ok := message.(*route.RouteMessage)
+		if !ok || routeMessage.Index == tunIndex {
+			continue
+		}
+		if routeMessage.Flags&unix.RTF_UP == 0 || routeMessage.Flags&unix.RTF_GATEWAY == 0 {
+			continue
+		}
+
+		family, ok := defaultRouteFamily(routeMessage)
+		if !ok {
+			continue
+		}
+		if family == unix.AF_INET {
+			return usableDarwinInterface(routeMessage.Index)
+		}
+		if family == unix.AF_INET6 && ipv6Index == 0 {
+			ipv6Index = routeMessage.Index
+		}
+	}
+
+	if ipv6Index != 0 {
+		return usableDarwinInterface(ipv6Index)
+	}
+	return nil, errors.New("default route not found")
+}
+
+func defaultRouteFamily(message *route.RouteMessage) (int, bool) {
+	if len(message.Addrs) <= unix.RTAX_NETMASK {
+		return 0, false
+	}
+
+	switch destination := message.Addrs[unix.RTAX_DST].(type) {
+	case *route.Inet4Addr:
+		mask, ok := message.Addrs[unix.RTAX_NETMASK].(*route.Inet4Addr)
+		if !ok || destination.IP != netip.IPv4Unspecified().As4() {
+			return 0, false
+		}
+		ones, bits := net.IPMask(mask.IP[:]).Size()
+		return unix.AF_INET, ones == 0 && bits == 32
+	case *route.Inet6Addr:
+		mask, ok := message.Addrs[unix.RTAX_NETMASK].(*route.Inet6Addr)
+		if !ok || destination.IP != netip.IPv6Unspecified().As16() {
+			return 0, false
+		}
+		ones, bits := net.IPMask(mask.IP[:]).Size()
+		return unix.AF_INET6, ones == 0 && bits == 128
+	default:
+		return 0, false
+	}
+}
+
+func usableDarwinInterface(index int) (*net.Interface, error) {
+	iface, err := net.InterfaceByIndex(index)
+	if err != nil {
+		return nil, err
+	}
+	if iface.Flags&net.FlagUp == 0 || iface.Flags&net.FlagLoopback != 0 {
+		return nil, errors.New("default route interface is not usable")
+	}
+	return iface, nil
+}
+
+func (t *DarwinTun) setSystemRoutes() error {
+	routes, err := buildDarwinSystemRoutes(t.options.AutoSystemRoutingTable)
+	if err != nil {
+		return err
+	}
+	if len(routes) == 0 {
+		return nil
+	}
+
+	tunIndex, err := t.Index()
+	if err != nil {
+		return err
+	}
+	for _, destination := range routes {
+		if err := execDarwinRoute(unix.RTM_ADD, tunIndex, destination); err != nil {
+			_ = t.unsetSystemRoutes()
+			return xerrors.New("failed to add system route ", destination).Base(err)
+		}
+		t.systemRoutes = append(t.systemRoutes, destination)
+	}
+	return nil
+}
+
+func (t *DarwinTun) unsetSystemRoutes() error {
+	var errs []error
+	tunIndex, indexErr := t.Index()
+	if indexErr != nil && len(t.systemRoutes) > 0 {
+		errs = append(errs, indexErr)
+	}
+	for i := len(t.systemRoutes) - 1; i >= 0; i-- {
+		destination := t.systemRoutes[i]
+		if err := execDarwinRoute(unix.RTM_DELETE, tunIndex, destination); err != nil && !errors.Is(err, unix.ESRCH) {
+			errs = append(errs, xerrors.New("failed to delete system route ", destination).Base(err))
+		}
+	}
+	t.systemRoutes = nil
+	return xerrors.Combine(errs...)
+}
+
+func buildDarwinSystemRoutes(configured []string) ([]netip.Prefix, error) {
+	routes := make([]netip.Prefix, 0, len(configured))
+	seen := make(map[netip.Prefix]struct{})
+
+	appendRoute := func(prefix netip.Prefix) {
+		prefix = prefix.Masked()
+		if _, found := seen[prefix]; found {
+			return
+		}
+		seen[prefix] = struct{}{}
+		routes = append(routes, prefix)
+	}
+
+	for _, value := range configured {
+		prefix, err := netip.ParsePrefix(value)
+		if err != nil {
+			return nil, xerrors.New("invalid system route ", value).Base(err)
+		}
+		prefix = prefix.Masked()
+		if prefix.Bits() == 0 {
+			for _, protected := range darwinProtectedDefaultRoutes(prefix.Addr().Is4()) {
+				appendRoute(protected)
+			}
+			continue
+		}
+		appendRoute(prefix)
+	}
+
+	return routes, nil
+}
+
+func darwinProtectedDefaultRoutes(ipv4 bool) []netip.Prefix {
+	routes := make([]netip.Prefix, 0, 8)
+	for i := 0; i < 8; i++ {
+		if ipv4 {
+			var address [4]byte
+			address[0] = 1 << i
+			routes = append(routes, netip.PrefixFrom(netip.AddrFrom4(address), 8-i))
+		} else {
+			var address [16]byte
+			address[0] = 1 << i
+			routes = append(routes, netip.PrefixFrom(netip.AddrFrom16(address), 8-i))
+		}
+	}
+	return routes
+}
+
+func execDarwinRoute(messageType int, interfaceIndex int, destination netip.Prefix) error {
+	message := route.RouteMessage{
+		Type:    messageType,
+		Version: unix.RTM_VERSION,
+		Flags:   unix.RTF_STATIC | unix.RTF_GATEWAY,
+		Seq:     1,
+	}
+	if messageType == unix.RTM_ADD {
+		message.Flags |= unix.RTF_UP
+	}
+
+	if destination.Addr().Is4() {
+		gatewayPrefix := netip.MustParsePrefix(gateway)
+		message.Addrs = []route.Addr{
+			unix.RTAX_DST:     &route.Inet4Addr{IP: destination.Addr().As4()},
+			unix.RTAX_NETMASK: &route.Inet4Addr{IP: prefixMask4(destination.Bits())},
+			unix.RTAX_GATEWAY: &route.Inet4Addr{IP: gatewayPrefix.Addr().As4()},
+		}
+	} else {
+		message.Flags &^= unix.RTF_GATEWAY
+		message.Index = interfaceIndex
+		message.Addrs = []route.Addr{
+			unix.RTAX_DST:     &route.Inet6Addr{IP: destination.Addr().As16()},
+			unix.RTAX_NETMASK: &route.Inet6Addr{IP: prefixMask6(destination.Bits())},
+			unix.RTAX_GATEWAY: &route.LinkAddr{Index: interfaceIndex},
+		}
+	}
+
+	request, err := message.Marshal()
+	if err != nil {
+		return err
+	}
+	fd, err := unix.Socket(unix.AF_ROUTE, unix.SOCK_RAW, 0)
+	if err != nil {
+		return err
+	}
+	defer unix.Close(fd)
+	_, err = unix.Write(fd, request)
+	return err
+}
+
+func prefixMask4(bits int) [4]byte {
+	var mask [4]byte
+	copy(mask[:], net.CIDRMask(bits, 32))
+	return mask
+}
+
+func prefixMask6(bits int) [16]byte {
+	var mask [16]byte
+	copy(mask[:], net.CIDRMask(bits, 128))
+	return mask
+}

proxy/tun/tun_default.go

@@ -42,3 +42,17 @@ func (t *DefaultTun) newEndpoint() (stack.LinkEndpoint, error) {
 func setinterface(string, string, uintptr, *net.Interface) error {
 	return errors.New("Tun is not supported on your platform")
 }
+
+func findOutboundInterface(tunIndex int, fixedName string) (*net.Interface, error) {
+	if fixedName == "" {
+		return nil, errors.New("automatic outbound interface selection is not supported on this platform")
+	}
+	iface, err := net.InterfaceByName(fixedName)
+	if err != nil {
+		return nil, err
+	}
+	if iface.Index == tunIndex {
+		return nil, errors.New("outbound interface cannot be the TUN interface")
+	}
+	return iface, nil
+}

proxy/tun/tun_freebsd.go

@@ -147,3 +147,17 @@ func (t *FreeBSDTun) newEndpoint() (stack.LinkEndpoint, error) {
 func setinterface(network, address string, fd uintptr, iface *net.Interface) error {
 	return nil
 }
+
+func findOutboundInterface(tunIndex int, fixedName string) (*net.Interface, error) {
+	if fixedName == "" {
+		return nil, errors.New("automatic outbound interface selection is not supported on this platform")
+	}
+	iface, err := net.InterfaceByName(fixedName)
+	if err != nil {
+		return nil, err
+	}
+	if iface.Index == tunIndex {
+		return nil, errors.New("outbound interface cannot be the TUN interface")
+	}
+	return iface, nil
+}

proxy/tun/tun_linux.go

@@ -3,9 +3,15 @@
 package tun
 
 import (
+	"context"
 	"net"
+	"net/netip"
+	"strconv"
+	"sync"
 
 	"github.com/vishvananda/netlink"
+	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/platform"
 	"golang.org/x/sys/unix"
 	"gvisor.dev/gvisor/pkg/tcpip/link/fdbased"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
@@ -18,6 +24,11 @@ type LinuxTun struct {
 	tunFd   int
 	tunLink netlink.Link
 	options *Config
+	ownsTun bool
+
+	systemRoutes     []netlink.Route
+	routeMonitorStop chan struct{}
+	routeMonitorOnce sync.Once
 }
 
 // LinuxTun implements Tun
@@ -25,12 +36,24 @@ var _ Tun = (*LinuxTun)(nil)
 
 // NewTun builds new tun interface handler (linux specific)
 func NewTun(options *Config) (Tun, error) {
-	tunFd, err := open(options.Name)
+	tunFd, tunLink, fdProvided, err := openFromEnv(options.Name)
+	if err != nil {
+		return nil, err
+	}
+	if fdProvided {
+		return &LinuxTun{
+			tunFd:   tunFd,
+			tunLink: tunLink,
+			options: options,
+		}, nil
+	}
+
+	tunFd, err = open(options.Name)
 	if err != nil {
 		return nil, err
 	}
 
-	tunLink, err := setup(options.Name, int(options.MTU))
+	tunLink, err = setup(options.Name, int(options.MTU))
 	if err != nil {
 		_ = unix.Close(tunFd)
 		return nil, err
@@ -40,11 +63,59 @@ func NewTun(options *Config) (Tun, error) {
 		tunFd:   tunFd,
 		tunLink: tunLink,
 		options: options,
+		ownsTun: true,
 	}
 
 	return linuxTun, nil
 }
 
+func openFromEnv(expectedName string) (int, netlink.Link, bool, error) {
+	fdStr := platform.NewEnvFlag(platform.TunFdKey).GetValue(func() string { return "" })
+	if fdStr == "" {
+		return -1, nil, false, nil
+	}
+
+	fd, err := strconv.Atoi(fdStr)
+	if err != nil {
+		return -1, nil, true, errors.New("invalid ", platform.TunFdKey).Base(err)
+	}
+	if fd < 3 {
+		return -1, nil, true, errors.New("invalid ", platform.TunFdKey, ": file descriptor must be >= 3")
+	}
+
+	ifr, err := unix.NewIfreq("")
+	if err != nil {
+		return -1, nil, true, err
+	}
+	if err = unix.IoctlIfreq(fd, unix.TUNGETIFF, ifr); err != nil {
+		return -1, nil, true, err
+	}
+
+	flags := ifr.Uint16()
+	if flags&unix.IFF_TUN == 0 {
+		return -1, nil, true, errors.New("invalid ", platform.TunFdKey, ": file descriptor is not a TUN device")
+	}
+	if flags&unix.IFF_NO_PI == 0 {
+		return -1, nil, true, errors.New("invalid ", platform.TunFdKey, ": TUN device must use IFF_NO_PI")
+	}
+
+	actualName := ifr.Name()
+	if expectedName != "" && actualName != expectedName {
+		return -1, nil, true, errors.New("invalid ", platform.TunFdKey, ": TUN device name ", actualName, " does not match configured name ", expectedName)
+	}
+
+	tunLink, err := netlink.LinkByName(actualName)
+	if err != nil {
+		return -1, nil, true, err
+	}
+
+	if err = unix.SetNonblock(fd, true); err != nil {
+		return -1, nil, true, err
+	}
+
+	return fd, tunLink, true, nil
+}
+
 // open the file that implements tun interface in the OS
 func open(name string) (int, error) {
 	fd, err := unix.Open("/dev/net/tun", unix.O_RDWR, 0)
@@ -93,17 +164,39 @@ func setup(name string, MTU int) (netlink.Link, error) {
 
 // Start is called by handler to bring tun interface to life
 func (t *LinuxTun) Start() error {
-	err := netlink.LinkSetUp(t.tunLink)
-	if err != nil {
+	if !t.ownsTun {
+		return nil
+	}
+
+	if err := netlink.LinkSetUp(t.tunLink); err != nil {
 		return err
 	}
 
+	if err := t.setSystemRoutes(); err != nil {
+		return err
+	}
+
+	if updater != nil {
+		t.routeMonitorStop = make(chan struct{})
+		go t.monitorRouteChanges()
+	}
+
 	return nil
 }
 
 // Close is called to shut down the tun interface
 func (t *LinuxTun) Close() error {
-	_ = netlink.LinkSetDown(t.tunLink)
+	t.routeMonitorOnce.Do(func() {
+		if t.routeMonitorStop != nil {
+			close(t.routeMonitorStop)
+		}
+	})
+
+	_ = t.unsetSystemRoutes()
+
+	if t.ownsTun {
+		_ = netlink.LinkSetDown(t.tunLink)
+	}
 	_ = unix.Close(t.tunFd)
 
 	return nil
@@ -129,3 +222,131 @@ func (t *LinuxTun) newEndpoint() (stack.LinkEndpoint, error) {
 func setinterface(network, address string, fd uintptr, iface *net.Interface) error {
 	return unix.BindToDevice(int(fd), iface.Name)
 }
+
+func (t *LinuxTun) setSystemRoutes() error {
+	if len(t.options.AutoSystemRoutingTable) == 0 {
+		return nil
+	}
+	tunIndex := t.tunLink.Attrs().Index
+	for _, cidr := range t.options.AutoSystemRoutingTable {
+		prefix, err := netip.ParsePrefix(cidr)
+		if err != nil {
+			return errors.New("invalid system route ", cidr).Base(err)
+		}
+		prefix = prefix.Masked()
+		_, ipNet, _ := net.ParseCIDR(prefix.String())
+		route := netlink.Route{
+			LinkIndex: tunIndex,
+			Dst:       ipNet,
+			Priority:  1,
+		}
+		if err := netlink.RouteAdd(&route); err != nil {
+			_ = t.unsetSystemRoutes()
+			return errors.New("failed to add system route ", cidr).Base(err)
+		}
+		t.systemRoutes = append(t.systemRoutes, route)
+	}
+	return nil
+}
+
+func (t *LinuxTun) unsetSystemRoutes() error {
+	var errs []error
+	for i := len(t.systemRoutes) - 1; i >= 0; i-- {
+		route := t.systemRoutes[i]
+		if err := netlink.RouteDel(&route); err != nil {
+			errs = append(errs, errors.New("failed to delete system route").Base(err))
+		}
+	}
+	t.systemRoutes = nil
+	return errors.Combine(errs...)
+}
+
+func (t *LinuxTun) monitorRouteChanges() {
+	routeCh := make(chan netlink.RouteUpdate)
+	if err := netlink.RouteSubscribe(routeCh, t.routeMonitorStop); err != nil {
+		errors.LogInfoInner(context.Background(), err, "[tun] failed to subscribe route changes")
+		return
+	}
+
+	linkCh := make(chan netlink.LinkUpdate)
+	if err := netlink.LinkSubscribe(linkCh, t.routeMonitorStop); err != nil {
+		errors.LogInfoInner(context.Background(), err, "[tun] failed to subscribe link changes")
+		return
+	}
+
+	for {
+		select {
+		case _, ok := <-routeCh:
+			if !ok {
+				return
+			}
+			if updater != nil {
+				updater.Update()
+			}
+		case _, ok := <-linkCh:
+			if !ok {
+				return
+			}
+			if updater != nil {
+				updater.Update()
+			}
+		case <-t.routeMonitorStop:
+			return
+		}
+	}
+}
+
+func findOutboundInterface(tunIndex int, fixedName string) (*net.Interface, error) {
+	if fixedName != "" {
+		iface, err := net.InterfaceByName(fixedName)
+		if err != nil {
+			return nil, err
+		}
+		if iface.Index == tunIndex {
+			return nil, errors.New("outbound interface cannot be the TUN interface")
+		}
+		return iface, nil
+	}
+
+	probeIPs := []net.IP{
+		net.ParseIP("8.8.8.8"),
+		net.ParseIP("2001:4860:4860::8888"),
+	}
+
+	for _, ip := range probeIPs {
+		routes, err := netlink.RouteGet(ip)
+		if err != nil || len(routes) == 0 {
+			continue
+		}
+		route := routes[0]
+		if route.LinkIndex == tunIndex {
+			continue
+		}
+
+		link, err := netlink.LinkByIndex(route.LinkIndex)
+		if err != nil {
+			continue
+		}
+		attrs := link.Attrs()
+
+		if attrs.Flags&net.FlagUp == 0 {
+			continue
+		}
+		operState := attrs.OperState
+		if operState != netlink.OperUp && operState != netlink.OperUnknown {
+			continue
+		}
+
+		if route.Src == nil || route.Src.IsLoopback() || route.Src.IsLinkLocalUnicast() {
+			continue
+		}
+
+		iface, err := net.InterfaceByIndex(route.LinkIndex)
+		if err != nil {
+			continue
+		}
+		return iface, nil
+	}
+
+	return nil, errors.New("no usable outbound interface found")
+}

proxy/tun/tun_windows.go

@@ -8,6 +8,8 @@ import (
 	go_errors "errors"
 	"net"
 	"net/netip"
+	"sort"
+	"strings"
 	"sync"
 	"unsafe"
 
@@ -307,3 +309,77 @@ func setinterface(network, address string, fd uintptr, iface *net.Interface) err
 
 	return errors.Combine(err1, err2, err3, err4)
 }
+
+func findOutboundInterface(tunIndex int, fixedName string) (*net.Interface, error) {
+	interfaces, err := net.Interfaces()
+	if err != nil {
+		return nil, err
+	}
+
+	if fixedName != "" {
+		for _, iface := range interfaces {
+			if iface.Index != tunIndex && iface.Name == fixedName {
+				return &iface, nil
+			}
+		}
+		return nil, nil
+	}
+
+	var candidates []struct {
+		index int
+		score int
+	}
+	for i, iface := range interfaces {
+		if iface.Index == tunIndex {
+			continue
+		}
+		if strings.Contains(iface.Name, "vEthernet") {
+			continue
+		}
+		if iface.Flags&net.FlagUp == 0 {
+			continue
+		}
+		if iface.Flags&net.FlagLoopback != 0 {
+			continue
+		}
+		addrs, err := iface.Addrs()
+		if err != nil || len(addrs) == 0 {
+			continue
+		}
+		candidates = append(candidates, struct {
+			index int
+			score int
+		}{i, scoreWindowsInterface(&iface, addrs)})
+	}
+
+	sort.Slice(candidates, func(i, j int) bool {
+		if candidates[i].score != candidates[j].score {
+			return candidates[i].score > candidates[j].score
+		}
+		return interfaces[candidates[i].index].Name < interfaces[candidates[j].index].Name
+	})
+	if len(candidates) == 0 {
+		return nil, nil
+	}
+
+	iface := interfaces[candidates[0].index]
+	return &iface, nil
+}
+
+func scoreWindowsInterface(iface *net.Interface, addrs []net.Addr) int {
+	score := 0
+
+	name := strings.ToLower(iface.Name)
+	if strings.Contains(name, "wlan") || strings.Contains(name, "wi-fi") {
+		score += 2
+	}
+
+	for _, addr := range addrs {
+		if strings.HasPrefix(addr.String(), "192.168.") {
+			score++
+			break
+		}
+	}
+
+	return score
+}

proxy/wireguard/config.go

@@ -1 +1,60 @@
 package wireguard
+
+import (
+	"encoding/hex"
+	"net/netip"
+
+	"github.com/xtls/xray-core/common/protocol"
+	"google.golang.org/protobuf/proto"
+)
+
+func (p *PeerConfig) AsAccount() (protocol.Account, error) {
+	pub, err := ParseKey(p.PublicKey)
+	if err != nil {
+		return nil, err
+	}
+
+	allowedIPs := make([]netip.Prefix, 0, len(p.AllowedIps))
+	for i := range p.AllowedIps {
+		p, err := netip.ParsePrefix(p.AllowedIps[i])
+		if err != nil {
+			return nil, err
+		}
+		allowedIPs = append(allowedIPs, p)
+	}
+
+	return &MemoryAccount{
+		Pub:          *pub,
+		AllowedIPs:   allowedIPs,
+		PreSharedKey: p.PreSharedKey,
+		KeepAlive:    p.KeepAlive,
+	}, nil
+}
+
+type MemoryAccount struct {
+	Pub          [32]byte
+	AllowedIPs   []netip.Prefix
+	PreSharedKey string
+	KeepAlive    string
+}
+
+func (a *MemoryAccount) Equals(other protocol.Account) bool {
+	if b, ok := other.(*MemoryAccount); ok {
+		return a.Pub == b.Pub
+	}
+	return false
+}
+
+func (a *MemoryAccount) ToProto() proto.Message {
+	allowedIPs := make([]string, 0, len(a.AllowedIPs))
+	for i := range a.AllowedIPs {
+		allowedIPs = append(allowedIPs, a.AllowedIPs[i].String())
+	}
+
+	return &PeerConfig{
+		PublicKey:    hex.EncodeToString(a.Pub[:]),
+		AllowedIps:   allowedIPs,
+		PreSharedKey: a.PreSharedKey,
+		KeepAlive:    a.KeepAlive,
+	}
+}

proxy/wireguard/config.pb.go

@@ -7,6 +7,7 @@
 package wireguard
 
 import (
+	protocol "github.com/xtls/xray-core/common/protocol"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -157,6 +158,7 @@ type DeviceConfig struct {
 	SecretKey      string                      `protobuf:"bytes,1,opt,name=secret_key,json=secretKey,proto3" json:"secret_key,omitempty"`
 	Endpoint       []string                    `protobuf:"bytes,2,rep,name=endpoint,proto3" json:"endpoint,omitempty"`
 	Peers          []*PeerConfig               `protobuf:"bytes,3,rep,name=peers,proto3" json:"peers,omitempty"`
+	Users          []*protocol.User            `protobuf:"bytes,5,rep,name=users,proto3" json:"users,omitempty"`
 	Mtu            int32                       `protobuf:"varint,4,opt,name=mtu,proto3" json:"mtu,omitempty"`
 	Reserved       []byte                      `protobuf:"bytes,6,opt,name=reserved,proto3" json:"reserved,omitempty"`
 	DomainStrategy DeviceConfig_DomainStrategy `protobuf:"varint,7,opt,name=domain_strategy,json=domainStrategy,proto3,enum=xray.proxy.wireguard.DeviceConfig_DomainStrategy" json:"domain_strategy,omitempty"`
@@ -217,6 +219,13 @@ func (x *DeviceConfig) GetPeers() []*PeerConfig {
 	return nil
 }
 
+func (x *DeviceConfig) GetUsers() []*protocol.User {
+	if x != nil {
+		return x.Users
+	}
+	return nil
+}
+
 func (x *DeviceConfig) GetMtu() int32 {
 	if x != nil {
 		return x.Mtu
@@ -256,7 +265,7 @@ var File_proxy_wireguard_config_proto protoreflect.FileDescriptor
 
 const file_proxy_wireguard_config_proto_rawDesc = "" +
 	"\n" +
-	"\x1cproxy/wireguard/config.proto\x12\x14xray.proxy.wireguard\"\xad\x01\n" +
+	"\x1cproxy/wireguard/config.proto\x12\x14xray.proxy.wireguard\x1a\x1acommon/protocol/user.proto\"\xad\x01\n" +
 	"\n" +
 	"PeerConfig\x12\x1d\n" +
 	"\n" +
@@ -266,12 +275,13 @@ const file_proxy_wireguard_config_proto_rawDesc = "" +
 	"\n" +
 	"keep_alive\x18\x04 \x01(\tR\tkeepAlive\x12\x1f\n" +
 	"\vallowed_ips\x18\x05 \x03(\tR\n" +
-	"allowedIps\"\xaa\x03\n" +
+	"allowedIps\"\xdc\x03\n" +
 	"\fDeviceConfig\x12\x1d\n" +
 	"\n" +
 	"secret_key\x18\x01 \x01(\tR\tsecretKey\x12\x1a\n" +
 	"\bendpoint\x18\x02 \x03(\tR\bendpoint\x126\n" +
-	"\x05peers\x18\x03 \x03(\v2 .xray.proxy.wireguard.PeerConfigR\x05peers\x12\x10\n" +
+	"\x05peers\x18\x03 \x03(\v2 .xray.proxy.wireguard.PeerConfigR\x05peers\x120\n" +
+	"\x05users\x18\x05 \x03(\v2\x1a.xray.common.protocol.UserR\x05users\x12\x10\n" +
 	"\x03mtu\x18\x04 \x01(\x05R\x03mtu\x12\x1a\n" +
 	"\breserved\x18\x06 \x01(\fR\breserved\x12Z\n" +
 	"\x0fdomain_strategy\x18\a \x01(\x0e21.xray.proxy.wireguard.DeviceConfig.DomainStrategyR\x0edomainStrategy\x12\x1b\n" +
@@ -305,15 +315,17 @@ var file_proxy_wireguard_config_proto_goTypes = []any{
 	(DeviceConfig_DomainStrategy)(0), // 0: xray.proxy.wireguard.DeviceConfig.DomainStrategy
 	(*PeerConfig)(nil),               // 1: xray.proxy.wireguard.PeerConfig
 	(*DeviceConfig)(nil),             // 2: xray.proxy.wireguard.DeviceConfig
+	(*protocol.User)(nil),            // 3: xray.common.protocol.User
 }
 var file_proxy_wireguard_config_proto_depIdxs = []int32{
 	1, // 0: xray.proxy.wireguard.DeviceConfig.peers:type_name -> xray.proxy.wireguard.PeerConfig
-	0, // 1: xray.proxy.wireguard.DeviceConfig.domain_strategy:type_name -> xray.proxy.wireguard.DeviceConfig.DomainStrategy
-	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
+	3, // 1: xray.proxy.wireguard.DeviceConfig.users:type_name -> xray.common.protocol.User
+	0, // 2: xray.proxy.wireguard.DeviceConfig.domain_strategy:type_name -> xray.proxy.wireguard.DeviceConfig.DomainStrategy
+	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
 }
 
 func init() { file_proxy_wireguard_config_proto_init() }

proxy/wireguard/config.proto

@@ -6,6 +6,8 @@ option go_package = "github.com/xtls/xray-core/proxy/wireguard";
 option java_package = "com.xray.proxy.wireguard";
 option java_multiple_files = true;
 
+import "common/protocol/user.proto";
+
 message PeerConfig {
   string public_key = 1;
   string pre_shared_key = 2;
@@ -25,6 +27,7 @@ message DeviceConfig {
   string secret_key = 1;
   repeated string endpoint = 2;
   repeated PeerConfig peers = 3;
+  repeated xray.common.protocol.User users = 5;
   int32 mtu = 4;
 
   bytes reserved = 6;

proxy/wireguard/server.go

@@ -2,16 +2,20 @@ package wireguard
 
 import (
 	"context"
+	"encoding/hex"
 	"fmt"
 	"net/netip"
+	"reflect"
 	"strings"
 	"sync"
 
+	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	c "github.com/xtls/xray-core/common/ctx"
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/protocol"
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/policy"
@@ -20,6 +24,7 @@ import (
 	"github.com/xtls/xray-core/transport"
 	"github.com/xtls/xray-core/transport/internet"
 	"github.com/xtls/xray-core/transport/internet/stat"
+	"golang.org/x/crypto/curve25519"
 	"golang.zx2c4.com/wireguard/device"
 	"golang.zx2c4.com/wireguard/tun"
 	"gvisor.dev/gvisor/pkg/tcpip/stack"
@@ -42,6 +47,9 @@ type Server struct {
 	stack *stack.Stack
 	dev   *device.Device
 	mu    sync.Mutex
+
+	pub   [32]byte
+	users *sync.Map
 }
 
 func NewServer(ctx context.Context, conf *DeviceConfig) (*Server, error) {
@@ -72,15 +80,6 @@ func NewServer(ctx context.Context, conf *DeviceConfig) (*Server, error) {
 		}
 	}
 
-	if len(conf.Peers) == 0 {
-		return nil, errors.New("empty peers")
-	}
-	for _, peer := range conf.Peers {
-		if peer.PublicKey == "" {
-			return nil, errors.New("peer without publickey")
-		}
-	}
-
 	localAddresses := make([]netip.Addr, 0, len(conf.Endpoint))
 	for _, localaddress := range conf.Endpoint {
 		addr, err := netip.ParseAddr(localaddress)
@@ -101,6 +100,19 @@ func NewServer(ctx context.Context, conf *DeviceConfig) (*Server, error) {
 		return nil, err
 	}
 
+	pri := common.Must2(ParseKey(conf.SecretKey))
+	var pub [32]byte
+	curve25519.ScalarBaseMult(&pub, pri)
+
+	users := &sync.Map{}
+	for _, u := range conf.Users {
+		user, err := u.ToMemoryUser()
+		if err != nil {
+			return nil, err
+		}
+		users.Store(user.Account.(*MemoryAccount).Pub, user)
+	}
+
 	return &Server{
 		conf:          conf,
 		ctx:           core.ToBackgroundDetachedContext(ctx),
@@ -116,9 +128,100 @@ func NewServer(ctx context.Context, conf *DeviceConfig) (*Server, error) {
 
 		tun:   tun,
 		stack: stack,
+
+		pub:   pub,
+		users: users,
 	}, nil
 }
 
+func (s *Server) AddUser(ctx context.Context, user *protocol.MemoryUser) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.dev == nil {
+		return errors.New("too early")
+	}
+	peer := user.Account.(*MemoryAccount)
+	if peer.Pub == s.pub {
+		return errors.New("invalid public key")
+	}
+	var sb strings.Builder
+	sb.WriteString("public_key=" + hex.EncodeToString(peer.Pub[:]) + "\n")
+	sb.WriteString("replace_allowed_ips=true\n")
+	for i := range peer.AllowedIPs {
+		sb.WriteString("allowed_ip=" + peer.AllowedIPs[i].String() + "\n")
+	}
+	if peer.PreSharedKey != "" {
+		sb.WriteString("preshared_key=" + peer.PreSharedKey + "\n")
+	}
+	if peer.KeepAlive != "" {
+		sb.WriteString("persistent_keepalive_interval=" + peer.KeepAlive + "\n")
+	}
+	err := s.dev.IpcSet(sb.String())
+	if err != nil {
+		return err
+	}
+	s.users.Store(peer.Pub, user)
+	return nil
+}
+
+func (s *Server) RemoveUser(ctx context.Context, email string) error {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	if s.dev == nil {
+		return errors.New("too early")
+	}
+	if user := s.GetUser(ctx, email); user != nil {
+		peer := user.Account.(*MemoryAccount)
+		err := s.dev.IpcSet("public_key=" + hex.EncodeToString(peer.Pub[:]) + "\nremove=true\n")
+		if err != nil {
+			return err
+		}
+		s.users.Delete(peer.Pub)
+	}
+	return nil
+}
+
+func (s *Server) GetUser(ctx context.Context, email string) (user *protocol.MemoryUser) {
+	s.users.Range(func(key, value any) bool {
+		if value.(*protocol.MemoryUser).Email == email {
+			user = value.(*protocol.MemoryUser)
+			return false
+		}
+		return true
+	})
+	return
+}
+
+func (s *Server) GetUserByAddr(ctx context.Context, addr netip.Addr) (user *protocol.MemoryUser) {
+	s.users.Range(func(key, value any) bool {
+		peer := value.(*protocol.MemoryUser).Account.(*MemoryAccount)
+		for i := range peer.AllowedIPs {
+			if peer.AllowedIPs[i].Contains(addr) {
+				user = value.(*protocol.MemoryUser)
+				return false
+			}
+		}
+		return true
+	})
+	return
+}
+
+func (s *Server) GetUsers(ctx context.Context) (users []*protocol.MemoryUser) {
+	s.users.Range(func(key, value interface{}) bool {
+		users = append(users, value.(*protocol.MemoryUser))
+		return true
+	})
+	return
+}
+
+func (s *Server) GetUsersCount(context.Context) (count int64) {
+	s.users.Range(func(key, value interface{}) bool {
+		count++
+		return true
+	})
+	return
+}
+
 // Network implements proxy.Inbound.Network.
 func (*Server) Network() []net.Network {
 	return []net.Network{}
@@ -196,18 +299,20 @@ func (s *Server) Start() error {
 	dev := device.NewDevice(s.tun, bind, logger)
 	var cfg strings.Builder
 	cfg.WriteString("private_key=" + s.conf.SecretKey + "\n")
-	for _, peer := range s.conf.Peers {
-		cfg.WriteString("public_key=" + peer.PublicKey + "\n")
+	s.users.Range(func(key, value any) bool {
+		peer := value.(*protocol.MemoryUser).Account.(*MemoryAccount)
+		cfg.WriteString("public_key=" + hex.EncodeToString(peer.Pub[:]) + "\n")
+		for i := range peer.AllowedIPs {
+			cfg.WriteString("allowed_ip=" + peer.AllowedIPs[i].String() + "\n")
+		}
 		if peer.PreSharedKey != "" {
 			cfg.WriteString("preshared_key=" + peer.PreSharedKey + "\n")
 		}
-		for _, ip := range peer.AllowedIps {
-			cfg.WriteString("allowed_ip=" + ip + "\n")
-		}
 		if peer.KeepAlive != "" {
 			cfg.WriteString("persistent_keepalive_interval=" + peer.KeepAlive + "\n")
 		}
-	}
+		return true
+	})
 	err := dev.IpcSet(cfg.String())
 	if err != nil {
 		return err
@@ -227,12 +332,36 @@ func (s *Server) HandleConnection(conn net.Conn, dest net.Destination) {
 	defer cancel()
 	ctx = c.ContextWithID(ctx, session.NewID())
 
-	source := net.DestinationFromAddr(conn.RemoteAddr())
+	remote := conn.RemoteAddr()
+	if remote == nil {
+		errors.LogError(context.Background(), "nil remote")
+		return
+	}
+
+	var addr netip.Addr
+	switch v := remote.(type) {
+	case *net.TCPAddr:
+		addr, _ = netip.AddrFromSlice(v.IP)
+	case *net.UDPAddr:
+		addr, _ = netip.AddrFromSlice(v.IP)
+	default:
+		errors.LogError(context.Background(), "invalid addr type ", reflect.TypeOf(v))
+		return
+	}
+
+	user := s.GetUserByAddr(context.TODO(), addr)
+	if user == nil {
+		errors.LogError(context.Background(), "nil user form ", remote, " to ", dest)
+		return
+	}
+
+	source := net.DestinationFromAddr(remote)
 	inbound := session.Inbound{
 		Name:          "wireguard",
 		Tag:           s.tag,
 		CanSpliceCopy: 3,
 		Source:        source,
+		User:          user,
 	}
 
 	ctx = session.ContextWithInbound(ctx, &inbound)
@@ -257,3 +386,14 @@ func (s *Server) HandleConnection(conn net.Conn, dest net.Destination) {
 		errors.LogError(ctx, errors.New("connection closed").Base(err))
 	}
 }
+
+func ParseKey(str string) (*[32]byte, error) {
+	slice, err := hex.DecodeString(str)
+	if err != nil {
+		return nil, err
+	}
+	if len(slice) != 32 {
+		return nil, errors.New("len(slice) != 32")
+	}
+	return (*[32]byte)(slice), nil
+}

transport/internet/finalmask/finalmask.go

@@ -3,6 +3,7 @@ package finalmask
 import (
 	"context"
 	"net"
+	"slices"
 
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/errors"
@@ -28,7 +29,7 @@ func NewUdpmaskManager(udpmasks []Udpmask) *UdpmaskManager {
 func (m *UdpmaskManager) WrapPacketConnClient(raw net.PacketConn) (net.PacketConn, error) {
 	var sizes []int
 	var conns []net.PacketConn
-	for i, mask := range m.udpmasks {
+	for i, mask := range slices.Backward(m.udpmasks) {
 		if _, ok := mask.(headerConn); ok {
 			conn, err := mask.WrapPacketConnClient(nil, i, len(m.udpmasks)-1)
 			if err != nil {
@@ -61,7 +62,7 @@ func (m *UdpmaskManager) WrapPacketConnClient(raw net.PacketConn) (net.PacketCon
 func (m *UdpmaskManager) WrapPacketConnServer(raw net.PacketConn) (net.PacketConn, error) {
 	var sizes []int
 	var conns []net.PacketConn
-	for i, mask := range m.udpmasks {
+	for i, mask := range slices.Backward(m.udpmasks) {
 		if _, ok := mask.(headerConn); ok {
 			conn, err := mask.WrapPacketConnServer(nil, i, len(m.udpmasks)-1)
 			if err != nil {
@@ -124,7 +125,7 @@ func (c *headerManagerConn) ReadFrom(p []byte) (n int, addr net.Addr, err error)
 		if err != nil {
 			return n, addr, err
 		}
-		b = b[:n]
+		buf := b[:n]
 
 		sum := 0
 		for _, size := range c.sizes {
@@ -132,24 +133,24 @@ func (c *headerManagerConn) ReadFrom(p []byte) (n int, addr net.Addr, err error)
 		}
 
 		if n < sum {
-			errors.LogError(context.Background(), "[mask] drop packet from ", addr, " with size ", len(b))
+			errors.LogError(context.Background(), "[mask] drop packet from ", addr, " with size ", n)
 			continue
 		}
 
 		for i := range c.conns {
-			n, _, err = c.conns[i].ReadFrom(b)
+			n, _, err = c.conns[i].ReadFrom(buf)
 			if err != nil {
-				errors.LogErrorInner(context.Background(), err, "[mask] drop packet from ", addr, " with size ", len(b))
+				errors.LogErrorInner(context.Background(), err, "[mask] drop packet from ", addr, " with size ", n)
 				break
 			}
-			b = b[c.sizes[i] : n+c.sizes[i]]
+			buf = buf[c.sizes[i] : n+c.sizes[i]]
 		}
 
 		if err != nil {
 			continue
 		}
 
-		return copy(p, b), addr, nil
+		return copy(p, buf), addr, nil
 	}
 }
 
@@ -212,7 +213,7 @@ func NewTcpmaskManager(tcpmasks []Tcpmask) *TcpmaskManager {
 
 func (m *TcpmaskManager) WrapConnClient(raw net.Conn) (net.Conn, error) {
 	var err error
-	for _, mask := range m.tcpmasks {
+	for _, mask := range slices.Backward(m.tcpmasks) {
 		raw, err = mask.WrapConnClient(raw)
 		if err != nil {
 			return nil, err
@@ -223,7 +224,7 @@ func (m *TcpmaskManager) WrapConnClient(raw net.Conn) (net.Conn, error) {
 
 func (m *TcpmaskManager) WrapConnServer(raw net.Conn) (net.Conn, error) {
 	var err error
-	for _, mask := range m.tcpmasks {
+	for _, mask := range slices.Backward(m.tcpmasks) {
 		raw, err = mask.WrapConnServer(raw)
 		if err != nil {
 			return nil, err

transport/internet/finalmask/fragment/config.pb.go

@@ -25,12 +25,12 @@ type Config struct {
 	state         protoimpl.MessageState `protogen:"open.v1"`
 	PacketsFrom   int64                  `protobuf:"varint,1,opt,name=packets_from,json=packetsFrom,proto3" json:"packets_from,omitempty"`
 	PacketsTo     int64                  `protobuf:"varint,2,opt,name=packets_to,json=packetsTo,proto3" json:"packets_to,omitempty"`
-	LengthMin     int64                  `protobuf:"varint,3,opt,name=length_min,json=lengthMin,proto3" json:"length_min,omitempty"`
-	LengthMax     int64                  `protobuf:"varint,4,opt,name=length_max,json=lengthMax,proto3" json:"length_max,omitempty"`
-	DelayMin      int64                  `protobuf:"varint,5,opt,name=delay_min,json=delayMin,proto3" json:"delay_min,omitempty"`
-	DelayMax      int64                  `protobuf:"varint,6,opt,name=delay_max,json=delayMax,proto3" json:"delay_max,omitempty"`
 	MaxSplitMin   int64                  `protobuf:"varint,7,opt,name=max_split_min,json=maxSplitMin,proto3" json:"max_split_min,omitempty"`
 	MaxSplitMax   int64                  `protobuf:"varint,8,opt,name=max_split_max,json=maxSplitMax,proto3" json:"max_split_max,omitempty"`
+	LengthsMin    []int64                `protobuf:"varint,9,rep,packed,name=lengths_min,json=lengthsMin,proto3" json:"lengths_min,omitempty"`
+	LengthsMax    []int64                `protobuf:"varint,10,rep,packed,name=lengths_max,json=lengthsMax,proto3" json:"lengths_max,omitempty"`
+	DelaysMin     []int64                `protobuf:"varint,11,rep,packed,name=delays_min,json=delaysMin,proto3" json:"delays_min,omitempty"`
+	DelaysMax     []int64                `protobuf:"varint,12,rep,packed,name=delays_max,json=delaysMax,proto3" json:"delays_max,omitempty"`
 	unknownFields protoimpl.UnknownFields
 	sizeCache     protoimpl.SizeCache
 }
@@ -79,34 +79,6 @@ func (x *Config) GetPacketsTo() int64 {
 	return 0
 }
 
-func (x *Config) GetLengthMin() int64 {
-	if x != nil {
-		return x.LengthMin
-	}
-	return 0
-}
-
-func (x *Config) GetLengthMax() int64 {
-	if x != nil {
-		return x.LengthMax
-	}
-	return 0
-}
-
-func (x *Config) GetDelayMin() int64 {
-	if x != nil {
-		return x.DelayMin
-	}
-	return 0
-}
-
-func (x *Config) GetDelayMax() int64 {
-	if x != nil {
-		return x.DelayMax
-	}
-	return 0
-}
-
 func (x *Config) GetMaxSplitMin() int64 {
 	if x != nil {
 		return x.MaxSplitMin
@@ -121,23 +93,54 @@ func (x *Config) GetMaxSplitMax() int64 {
 	return 0
 }
 
+func (x *Config) GetLengthsMin() []int64 {
+	if x != nil {
+		return x.LengthsMin
+	}
+	return nil
+}
+
+func (x *Config) GetLengthsMax() []int64 {
+	if x != nil {
+		return x.LengthsMax
+	}
+	return nil
+}
+
+func (x *Config) GetDelaysMin() []int64 {
+	if x != nil {
+		return x.DelaysMin
+	}
+	return nil
+}
+
+func (x *Config) GetDelaysMax() []int64 {
+	if x != nil {
+		return x.DelaysMax
+	}
+	return nil
+}
+
 var File_transport_internet_finalmask_fragment_config_proto protoreflect.FileDescriptor
 
 const file_transport_internet_finalmask_fragment_config_proto_rawDesc = "" +
 	"\n" +
-	"2transport/internet/finalmask/fragment/config.proto\x12*xray.transport.internet.finalmask.fragment\"\x8a\x02\n" +
+	"2transport/internet/finalmask/fragment/config.proto\x12*xray.transport.internet.finalmask.fragment\"\x92\x02\n" +
 	"\x06Config\x12!\n" +
 	"\fpackets_from\x18\x01 \x01(\x03R\vpacketsFrom\x12\x1d\n" +
 	"\n" +
-	"packets_to\x18\x02 \x01(\x03R\tpacketsTo\x12\x1d\n" +
-	"\n" +
-	"length_min\x18\x03 \x01(\x03R\tlengthMin\x12\x1d\n" +
-	"\n" +
-	"length_max\x18\x04 \x01(\x03R\tlengthMax\x12\x1b\n" +
-	"\tdelay_min\x18\x05 \x01(\x03R\bdelayMin\x12\x1b\n" +
-	"\tdelay_max\x18\x06 \x01(\x03R\bdelayMax\x12\"\n" +
+	"packets_to\x18\x02 \x01(\x03R\tpacketsTo\x12\"\n" +
 	"\rmax_split_min\x18\a \x01(\x03R\vmaxSplitMin\x12\"\n" +
-	"\rmax_split_max\x18\b \x01(\x03R\vmaxSplitMaxB\xa0\x01\n" +
+	"\rmax_split_max\x18\b \x01(\x03R\vmaxSplitMax\x12\x1f\n" +
+	"\vlengths_min\x18\t \x03(\x03R\n" +
+	"lengthsMin\x12\x1f\n" +
+	"\vlengths_max\x18\n" +
+	" \x03(\x03R\n" +
+	"lengthsMax\x12\x1d\n" +
+	"\n" +
+	"delays_min\x18\v \x03(\x03R\tdelaysMin\x12\x1d\n" +
+	"\n" +
+	"delays_max\x18\f \x03(\x03R\tdelaysMaxB\xa0\x01\n" +
 	".com.xray.transport.internet.finalmask.fragmentP\x01Z?github.com/xtls/xray-core/transport/internet/finalmask/fragment\xaa\x02*Xray.Transport.Internet.Finalmask.Fragmentb\x06proto3"
 
 var (

transport/internet/finalmask/fragment/config.proto

@@ -9,10 +9,10 @@ option java_multiple_files = true;
 message Config {
   int64 packets_from = 1;
   int64 packets_to = 2;
-  int64 length_min = 3;
-  int64 length_max = 4;
-  int64 delay_min = 5;
-  int64 delay_max = 6;
   int64 max_split_min = 7;
   int64 max_split_max = 8;
+  repeated int64 lengths_min = 9;
+  repeated int64 lengths_max = 10;
+  repeated int64 delays_min = 11;
+  repeated int64 delays_max = 12;
 }

transport/internet/finalmask/fragment/conn.go

@@ -43,6 +43,29 @@ func (c *fragmentConn) Splice() bool {
 	return true
 }
 
+// lengthForSegment returns the length range (min, max) for the given segment index (0-based).
+// Clamps to the last entry when the index exceeds the list length.
+func (c *fragmentConn) lengthForSegment(segIdx int) (int64, int64) {
+	if segIdx >= len(c.config.LengthsMin) {
+		segIdx = len(c.config.LengthsMin) - 1
+	}
+	return c.config.LengthsMin[segIdx], c.config.LengthsMax[segIdx]
+}
+
+// delayForSegment returns the delay range (min, max) for the given segment index (0-based).
+// Clamps to the last entry when the index exceeds the list length.
+func (c *fragmentConn) delayForSegment(segIdx int) (int64, int64) {
+	if segIdx >= len(c.config.DelaysMin) {
+		segIdx = len(c.config.DelaysMin) - 1
+	}
+	return c.config.DelaysMin[segIdx], c.config.DelaysMax[segIdx]
+}
+
+// mergeTlsHelloSegments returns true only when delays has exactly one zero entry.
+func (c *fragmentConn) mergeTlsHelloSegments() bool {
+	return len(c.config.DelaysMax) == 1 && c.config.DelaysMax[0] == 0
+}
+
 func (c *fragmentConn) Write(p []byte) (n int, err error) {
 	c.count++
 
@@ -57,12 +80,13 @@ func (c *fragmentConn) Write(p []byte) (n int, err error) {
 		data := p[5:recordLen]
 		buff := make([]byte, 2048)
 		var hello []byte
+		mergeHello := c.mergeTlsHelloSegments()
 		maxSplit := crypto.RandBetween(c.config.MaxSplitMin, c.config.MaxSplitMax)
 		var splitNum int64
 		for from := 0; ; {
-			to := from + int(crypto.RandBetween(c.config.LengthMin, c.config.LengthMax))
-			splitNum++
-			if to > len(data) || (maxSplit > 0 && splitNum >= maxSplit) {
+			lengthMin, lengthMax := c.lengthForSegment(int(splitNum))
+			to := from + int(crypto.RandBetween(lengthMin, lengthMax))
+			if to > len(data) || (maxSplit > 0 && splitNum+1 >= maxSplit) {
 				to = len(data)
 			}
 			l := to - from
@@ -74,15 +98,19 @@ func (c *fragmentConn) Write(p []byte) (n int, err error) {
 			from = to
 			buff[3] = byte(l >> 8)
 			buff[4] = byte(l)
-			if c.config.DelayMax == 0 {
+			if mergeHello {
 				hello = append(hello, buff[:5+l]...)
 			} else {
+				delayMin, delayMax := c.delayForSegment(int(splitNum))
 				_, err := c.Conn.Write(buff[:5+l])
-				time.Sleep(time.Duration(crypto.RandBetween(c.config.DelayMin, c.config.DelayMax)) * time.Millisecond)
+				if delayMax > 0 {
+					time.Sleep(time.Duration(crypto.RandBetween(delayMin, delayMax)) * time.Millisecond)
+				}
 				if err != nil {
 					return 0, err
 				}
 			}
+			splitNum++
 			if from == len(data) {
 				if len(hello) > 0 {
 					_, err := c.Conn.Write(hello)
@@ -107,9 +135,9 @@ func (c *fragmentConn) Write(p []byte) (n int, err error) {
 	maxSplit := crypto.RandBetween(c.config.MaxSplitMin, c.config.MaxSplitMax)
 	var splitNum int64
 	for from := 0; ; {
-		to := from + int(crypto.RandBetween(c.config.LengthMin, c.config.LengthMax))
-		splitNum++
-		if to > len(p) || (maxSplit > 0 && splitNum >= maxSplit) {
+		lengthMin, lengthMax := c.lengthForSegment(int(splitNum))
+		to := from + int(crypto.RandBetween(lengthMin, lengthMax))
+		if to > len(p) || (maxSplit > 0 && splitNum+1 >= maxSplit) {
 			to = len(p)
 		}
 		n, err := c.Conn.Write(p[from:to])
@@ -117,7 +145,11 @@ func (c *fragmentConn) Write(p []byte) (n int, err error) {
 		if err != nil {
 			return from, err
 		}
-		time.Sleep(time.Duration(crypto.RandBetween(c.config.DelayMin, c.config.DelayMax)) * time.Millisecond)
+		delayMin, delayMax := c.delayForSegment(int(splitNum))
+		if delayMax > 0 {
+			time.Sleep(time.Duration(crypto.RandBetween(delayMin, delayMax)) * time.Millisecond)
+		}
+		splitNum++
 		if from >= len(p) {
 			return from, nil
 		}

transport/internet/finalmask/sudoku/sudoku_test.go

@@ -372,7 +372,6 @@ func runHysteria2Case(t *testing.T, bin string, mode trafficMode, payloadSize in
 							{
 								ProtocolName: "hysteria",
 								Settings: serial.ToTypedMessage(&hytransport.Config{
-									Version:        2,
 									Auth:           auth,
 									UdpIdleTimeout: 60,
 								}),
@@ -421,7 +420,6 @@ func runHysteria2Case(t *testing.T, bin string, mode trafficMode, payloadSize in
 		Outbound: []*core.OutboundHandlerConfig{
 			{
 				ProxySettings: serial.ToTypedMessage(&hyproxy.ClientConfig{
-					Version: 2,
 					Server: &protocol.ServerEndpoint{
 						Address: xnet.NewIPOrDomain(xnet.LocalHostIP),
 						Port:    uint32(relayPort),
@@ -437,7 +435,6 @@ func runHysteria2Case(t *testing.T, bin string, mode trafficMode, payloadSize in
 							{
 								ProtocolName: "hysteria",
 								Settings: serial.ToTypedMessage(&hytransport.Config{
-									Version:        2,
 									Auth:           auth,
 									UdpIdleTimeout: 60,
 								}),

transport/internet/grpc/dial.go

@@ -62,7 +62,7 @@ func dialgRPC(ctx context.Context, dest net.Destination, streamSettings *interne
 		if err != nil {
 			return nil, errors.New("Cannot dial gRPC").Base(err)
 		}
-		return encoding.NewMultiHunkConn(grpcService, nil), nil
+		return encoding.NewMultiHunkConn(grpcService, nil, nil), nil
 	}
 
 	errors.LogDebug(ctx, "using gRPC tun mode service name: `"+grpcSettings.getServiceName()+"` stream name: `"+grpcSettings.getTunStreamName()+"`")
@@ -71,7 +71,7 @@ func dialgRPC(ctx context.Context, dest net.Destination, streamSettings *interne
 		return nil, errors.New("Cannot dial gRPC").Base(err)
 	}
 
-	return encoding.NewHunkConn(grpcService, nil), nil
+	return encoding.NewHunkConn(grpcService, nil, nil), nil
 }
 
 func getGrpcClient(ctx context.Context, dest net.Destination, streamSettings *internet.MemoryStreamConfig) (*grpc.ClientConn, error) {

transport/internet/grpc/encoding/hunkconn.go

@@ -9,8 +9,6 @@ import (
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/common/signal/done"
-	"google.golang.org/grpc/metadata"
-	"google.golang.org/grpc/peer"
 )
 
 type HunkConn interface {
@@ -38,31 +36,8 @@ func NewHunkReadWriter(hc HunkConn, cancel context.CancelFunc) *HunkReaderWriter
 	return &HunkReaderWriter{hc, cancel, done.New(), nil, 0}
 }
 
-func NewHunkConn(hc HunkConn, cancel context.CancelFunc) net.Conn {
-	var rAddr net.Addr
-	pr, ok := peer.FromContext(hc.Context())
-	if ok {
-		rAddr = pr.Addr
-	} else {
-		rAddr = &net.TCPAddr{
-			IP:   []byte{0, 0, 0, 0},
-			Port: 0,
-		}
-	}
-
-	md, ok := metadata.FromIncomingContext(hc.Context())
-	if ok {
-		header := md.Get("x-real-ip")
-		if len(header) > 0 {
-			realip := net.ParseAddress(header[0])
-			if realip.Family().IsIP() {
-				rAddr = &net.TCPAddr{
-					IP:   realip.IP(),
-					Port: 0,
-				}
-			}
-		}
-	}
+func NewHunkConn(hc HunkConn, cancel context.CancelFunc, trustedXForwardedFor []string) net.Conn {
+	rAddr := remoteAddrFromContext(hc.Context(), trustedXForwardedFor)
 	wrc := NewHunkReadWriter(hc, cancel)
 	return cnc.NewConnection(
 		cnc.ConnectionInput(wrc),

transport/internet/grpc/encoding/multiconn.go

@@ -3,15 +3,12 @@ package encoding
 import (
 	"context"
 	"io"
-	"net"
 
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/errors"
-	xnet "github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/common/signal/done"
-	"google.golang.org/grpc/metadata"
-	"google.golang.org/grpc/peer"
 )
 
 type MultiHunkConn interface {
@@ -34,31 +31,8 @@ func NewMultiHunkReadWriter(hc MultiHunkConn, cancel context.CancelFunc) *MultiH
 	return &MultiHunkReaderWriter{hc, cancel, done.New(), nil}
 }
 
-func NewMultiHunkConn(hc MultiHunkConn, cancel context.CancelFunc) net.Conn {
-	var rAddr net.Addr
-	pr, ok := peer.FromContext(hc.Context())
-	if ok {
-		rAddr = pr.Addr
-	} else {
-		rAddr = &net.TCPAddr{
-			IP:   []byte{0, 0, 0, 0},
-			Port: 0,
-		}
-	}
-
-	md, ok := metadata.FromIncomingContext(hc.Context())
-	if ok {
-		header := md.Get("x-real-ip")
-		if len(header) > 0 {
-			realip := xnet.ParseAddress(header[0])
-			if realip.Family().IsIP() {
-				rAddr = &net.TCPAddr{
-					IP:   realip.IP(),
-					Port: 0,
-				}
-			}
-		}
-	}
+func NewMultiHunkConn(hc MultiHunkConn, cancel context.CancelFunc, trustedXForwardedFor []string) net.Conn {
+	rAddr := remoteAddrFromContext(hc.Context(), trustedXForwardedFor)
 	wrc := NewMultiHunkReadWriter(hc, cancel)
 	return cnc.NewConnection(
 		cnc.ConnectionInputMulti(wrc),

transport/internet/grpc/encoding/remoteaddr.go

@@ -0,0 +1,58 @@
+package encoding
+
+import (
+	"context"
+	"strings"
+
+	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/net"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/peer"
+)
+
+func remoteAddrFromContext(ctx context.Context, trusted []string) net.Addr {
+	var remoteAddr net.Addr
+	if pr, ok := peer.FromContext(ctx); ok {
+		remoteAddr = pr.Addr
+	} else {
+		remoteAddr = &net.TCPAddr{
+			IP:   []byte{0, 0, 0, 0},
+			Port: 0,
+		}
+	}
+
+	md, ok := metadata.FromIncomingContext(ctx)
+	if !ok {
+		return remoteAddr
+	}
+
+	if forwardedAddr := parseTrustedXForwardedFor(md, trusted, remoteAddr); forwardedAddr != nil && forwardedAddr.Family().IsIP() {
+		remoteAddr = &net.TCPAddr{
+			IP:   forwardedAddr.IP(),
+			Port: 0,
+		}
+	}
+	return remoteAddr
+}
+
+func parseTrustedXForwardedFor(md metadata.MD, trusted []string, remoteAddr net.Addr) net.Address {
+	values := md.Get("X-Forwarded-For")
+	if len(values) == 0 || values[0] == "" {
+		return nil
+	}
+	value := values[0]
+	for _, t := range trusted {
+		if len(md.Get(t)) > 0 {
+			if idx := strings.IndexByte(value, ','); idx >= 0 {
+				value = value[:idx]
+			}
+			return net.ParseAddress(value)
+		}
+	}
+	if len(trusted) == 0 {
+		errors.LogWarning(context.Background(), `received "X-Forwarded-For" from `, remoteAddr, ` but "sockopt.trustedXForwardedFor" is not configured; ignoring it and using the real remote address`)
+	} else {
+		errors.LogError(context.Background(), `ignored potentially forged "X-Forwarded-For" from `, remoteAddr, `: `, value)
+	}
+	return nil
+}

transport/internet/grpc/encoding/remoteaddr_test.go

@@ -0,0 +1,53 @@
+package encoding
+
+import (
+	"context"
+	"net"
+	"testing"
+
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/peer"
+)
+
+func TestRemoteAddrFromContext(t *testing.T) {
+	tests := []struct {
+		name                  string
+		metadata              metadata.MD
+		trustedXForwardedFor  []string
+		expectedRemoteAddress string
+	}{
+		{
+			name:                  "trust X-Forwarded-For when configured",
+			metadata:              metadata.Pairs("X-Forwarded-For", "2.2.2.2, 3.3.3.3"),
+			trustedXForwardedFor:  []string{"X-Forwarded-For"},
+			expectedRemoteAddress: "2.2.2.2:0",
+		},
+		{
+			name:                  "trust X-Forwarded-For with trusted marker",
+			metadata:              metadata.Pairs("X-Forwarded-For", "4.4.4.4", "X-Trusted-CDN", "1"),
+			trustedXForwardedFor:  []string{"X-Trusted-CDN"},
+			expectedRemoteAddress: "4.4.4.4:0",
+		},
+		{
+			name:                  "ignore X-Forwarded-For without trusted marker",
+			metadata:              metadata.Pairs("X-Forwarded-For", "5.5.5.5"),
+			trustedXForwardedFor:  []string{"X-Trusted-CDN"},
+			expectedRemoteAddress: "127.0.0.1:12345",
+		},
+	}
+
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			ctx := peer.NewContext(metadata.NewIncomingContext(context.Background(), test.metadata), &peer.Peer{
+				Addr: &net.TCPAddr{
+					IP:   net.ParseIP("127.0.0.1"),
+					Port: 12345,
+				},
+			})
+			remoteAddr := remoteAddrFromContext(ctx, test.trustedXForwardedFor)
+			if remoteAddr.String() != test.expectedRemoteAddress {
+				t.Fatalf("unexpected remote address: %s", remoteAddr.String())
+			}
+		})
+	}
+}

transport/internet/grpc/hub.go

@@ -19,24 +19,25 @@ import (
 
 type Listener struct {
 	encoding.UnimplementedGRPCServiceServer
-	ctx     context.Context
-	handler internet.ConnHandler
-	local   net.Addr
-	config  *Config
+	ctx                  context.Context
+	handler              internet.ConnHandler
+	local                net.Addr
+	config               *Config
+	trustedXForwardedFor []string
 
 	s *grpc.Server
 }
 
 func (l Listener) Tun(server encoding.GRPCService_TunServer) error {
 	tunCtx, cancel := context.WithCancel(l.ctx)
-	l.handler(encoding.NewHunkConn(server, cancel))
+	l.handler(encoding.NewHunkConn(server, cancel, l.trustedXForwardedFor))
 	<-tunCtx.Done()
 	return nil
 }
 
 func (l Listener) TunMulti(server encoding.GRPCService_TunMultiServer) error {
 	tunCtx, cancel := context.WithCancel(l.ctx)
-	l.handler(encoding.NewMultiHunkConn(server, cancel))
+	l.handler(encoding.NewMultiHunkConn(server, cancel, l.trustedXForwardedFor))
 	<-tunCtx.Done()
 	return nil
 }
@@ -74,6 +75,9 @@ func Listen(ctx context.Context, address net.Address, port net.Port, settings *i
 	}
 
 	listener.ctx = ctx
+	if settings.SocketSettings != nil {
+		listener.trustedXForwardedFor = settings.SocketSettings.TrustedXForwardedFor
+	}
 
 	config := tls.ConfigFromStreamSettings(settings)
 

transport/internet/httpupgrade/httpupgrade_test.go

@@ -138,6 +138,9 @@ func TestDialWithRemoteAddr(t *testing.T) {
 		ProtocolSettings: &Config{
 			Path: "httpupgrade",
 		},
+		SocketSettings: &internet.SocketConfig{
+			TrustedXForwardedFor: []string{"X-Forwarded-For"},
+		},
 	}, func(conn stat.Connection) {
 		go func(c stat.Connection) {
 			defer c.Close()

transport/internet/httpupgrade/hub.go

@@ -80,24 +80,12 @@ func (s *server) upgrade(conn net.Conn) (stat.Connection, error) {
 		return nil, err
 	}
 
-	var forwardedAddrs []net.Address
-	if s.socketSettings != nil && len(s.socketSettings.TrustedXForwardedFor) > 0 {
-		for _, key := range s.socketSettings.TrustedXForwardedFor {
-			if len(req.Header.Values(key)) > 0 {
-				forwardedAddrs = http_proto.ParseXForwardedFor(req.Header)
-				break
-			}
-		}
-	} else {
-		forwardedAddrs = http_proto.ParseXForwardedFor(req.Header)
-	}
 	remoteAddr := conn.RemoteAddr()
-	if len(forwardedAddrs) > 0 && forwardedAddrs[0].Family().IsIP() {
-		remoteAddr = &net.TCPAddr{
-			IP:   forwardedAddrs[0].IP(),
-			Port: int(0),
-		}
+	var trustedXFF []string
+	if s.socketSettings != nil {
+		trustedXFF = s.socketSettings.TrustedXForwardedFor
 	}
+	remoteAddr = http_proto.ApplyTrustedXForwardedFor(req.Header, trustedXFF, remoteAddr)
 
 	return stat.Connection(newConnection(conn, remoteAddr)), nil
 }

transport/internet/hysteria/config.pb.go

@@ -23,7 +23,6 @@ const (
 
 type Config struct {
 	state                protoimpl.MessageState `protogen:"open.v1"`
-	Version              int32                  `protobuf:"varint,1,opt,name=version,proto3" json:"version,omitempty"`
 	Auth                 string                 `protobuf:"bytes,2,opt,name=auth,proto3" json:"auth,omitempty"`
 	UdpIdleTimeout       int64                  `protobuf:"varint,3,opt,name=udp_idle_timeout,json=udpIdleTimeout,proto3" json:"udp_idle_timeout,omitempty"`
 	MasqType             string                 `protobuf:"bytes,4,opt,name=masq_type,json=masqType,proto3" json:"masq_type,omitempty"`
@@ -68,13 +67,6 @@ func (*Config) Descriptor() ([]byte, []int) {
 	return file_transport_internet_hysteria_config_proto_rawDescGZIP(), []int{0}
 }
 
-func (x *Config) GetVersion() int32 {
-	if x != nil {
-		return x.Version
-	}
-	return 0
-}
-
 func (x *Config) GetAuth() string {
 	if x != nil {
 		return x.Auth
@@ -149,9 +141,8 @@ var File_transport_internet_hysteria_config_proto protoreflect.FileDescriptor
 
 const file_transport_internet_hysteria_config_proto_rawDesc = "" +
 	"\n" +
-	"(transport/internet/hysteria/config.proto\x12 xray.transport.internet.hysteria\"\xa3\x04\n" +
-	"\x06Config\x12\x18\n" +
-	"\aversion\x18\x01 \x01(\x05R\aversion\x12\x12\n" +
+	"(transport/internet/hysteria/config.proto\x12 xray.transport.internet.hysteria\"\x8f\x04\n" +
+	"\x06Config\x12\x12\n" +
 	"\x04auth\x18\x02 \x01(\tR\x04auth\x12(\n" +
 	"\x10udp_idle_timeout\x18\x03 \x01(\x03R\x0eudpIdleTimeout\x12\x1b\n" +
 	"\tmasq_type\x18\x04 \x01(\tR\bmasqType\x12\x1b\n" +
@@ -166,7 +157,7 @@ const file_transport_internet_hysteria_config_proto_rawDesc = "" +
 	"\x17masq_string_status_code\x18\v \x01(\x05R\x14masqStringStatusCode\x1aD\n" +
 	"\x16MasqStringHeadersEntry\x12\x10\n" +
 	"\x03key\x18\x01 \x01(\tR\x03key\x12\x14\n" +
-	"\x05value\x18\x02 \x01(\tR\x05value:\x028\x01B\x82\x01\n" +
+	"\x05value\x18\x02 \x01(\tR\x05value:\x028\x01J\x04\b\x01\x10\x02B\x82\x01\n" +
 	"$com.xray.transport.internet.hysteriaP\x01Z5github.com/xtls/xray-core/transport/internet/hysteria\xaa\x02 Xray.Transport.Internet.Hysteriab\x06proto3"
 
 var (

transport/internet/hysteria/config.proto

@@ -7,7 +7,7 @@ option java_package = "com.xray.transport.internet.hysteria";
 option java_multiple_files = true;
 
 message Config {
-  int32 version = 1;
+  reserved 1;
   string auth = 2;
 
   int64 udp_idle_timeout = 3;

transport/internet/hysteria/hub.go

@@ -58,7 +58,7 @@ func (h *httpHandler) AuthHTTP(w http.ResponseWriter, r *http.Request) bool {
 
 		var user *protocol.MemoryUser
 		var ok bool
-		if h.validator != nil && h.validator.GetCount() > 0 {
+		if h.validator != nil && h.validator.NotEmpty() {
 			user = h.validator.Get(auth)
 		} else if h.config.Auth != "" {
 			ok = auth == h.config.Auth

transport/internet/splithttp/client.go

@@ -9,6 +9,7 @@ import (
 	"net/http/httptrace"
 	"sync"
 
+	"github.com/apernet/quic-go/http3"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/errors"
@@ -59,7 +60,11 @@ func (c *DefaultDialerClient) OpenStream(ctx context.Context, url string, sessio
 	if body != nil {
 		method = c.transportConfig.GetNormalizedUplinkHTTPMethod() // stream-up/one
 	}
-	req, _ := http.NewRequestWithContext(context.WithoutCancel(ctx), method, url, body)
+	req, err := http.NewRequestWithContext(context.WithoutCancel(ctx), method, url, body)
+	if err != nil {
+		errors.LogInfoInner(ctx, err, "failed to create HTTP request for "+url)
+		return nil, nil, nil, err
+	}
 	c.transportConfig.FillStreamRequest(req, sessionId, "")
 
 	wrc = &WaitReadCloser{Wait: make(chan struct{})}
@@ -172,6 +177,15 @@ func (c *DefaultDialerClient) PostPacket(ctx context.Context, url string, sessio
 	return nil
 }
 
+// HTTP/1.1 and HTTP/2 will close itself, we only handle HTTP/3 here
+func (c *DefaultDialerClient) Close() error {
+	transport := c.client.Transport
+	if h3Transport, ok := transport.(*http3.Transport); ok {
+		h3Transport.Close()
+	}
+	return nil
+}
+
 type WaitReadCloser struct {
 	Wait chan struct{}
 	io.ReadCloser

transport/internet/splithttp/dialer.go

@@ -259,6 +259,7 @@ func createHTTPClient(dest net.Destination, streamSettings *internet.MemoryStrea
 				if err != nil {
 					return nil, err
 				}
+				context.AfterFunc(conn.Context(), func() { pktConn.Close() })
 
 				switch quicParams.Congestion {
 				case "reno":
@@ -425,10 +426,10 @@ func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.Me
 	}
 
 	if xmuxClient != nil {
-		xmuxClient.OpenUsage.Add(1)
+		xmuxClient.AddRunning()
 	}
 	if xmuxClient2 != nil && xmuxClient2 != xmuxClient {
-		xmuxClient2.OpenUsage.Add(1)
+		xmuxClient2.AddRunning()
 	}
 	var closed atomic.Int32
 
@@ -440,10 +441,10 @@ func Dial(ctx context.Context, dest net.Destination, streamSettings *internet.Me
 				return
 			}
 			if xmuxClient != nil {
-				xmuxClient.OpenUsage.Add(-1)
+				xmuxClient.DoneRunning()
 			}
 			if xmuxClient2 != nil && xmuxClient2 != xmuxClient {
-				xmuxClient2.OpenUsage.Add(-1)
+				xmuxClient2.DoneRunning()
 			}
 		},
 	}

transport/internet/splithttp/hub.go

@@ -146,6 +146,7 @@ func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Req
 		writer.WriteHeader(http.StatusBadRequest)
 		return
 	}
+	obfsPaddingAccepted := h.config.XPaddingObfsMode && paddingValue != ""
 
 	sessionId, seqStr := h.config.ExtractMetaFromRequest(request, h.path)
 
@@ -155,17 +156,6 @@ func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Req
 		return
 	}
 
-	var forwardedAddrs []net.Address
-	if h.socketSettings != nil && len(h.socketSettings.TrustedXForwardedFor) > 0 {
-		for _, key := range h.socketSettings.TrustedXForwardedFor {
-			if len(request.Header.Values(key)) > 0 {
-				forwardedAddrs = http_proto.ParseXForwardedFor(request.Header)
-				break
-			}
-		}
-	} else {
-		forwardedAddrs = http_proto.ParseXForwardedFor(request.Header)
-	}
 	var remoteAddr net.Addr
 	var err error
 	remoteAddr, err = net.ResolveTCPAddr("tcp", request.RemoteAddr)
@@ -181,12 +171,11 @@ func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Req
 			Port: remoteAddr.(*net.TCPAddr).Port,
 		}
 	}
-	if len(forwardedAddrs) > 0 && forwardedAddrs[0].Family().IsIP() {
-		remoteAddr = &net.TCPAddr{
-			IP:   forwardedAddrs[0].IP(),
-			Port: 0,
-		}
+	var trustedXFF []string
+	if h.socketSettings != nil {
+		trustedXFF = h.socketSettings.TrustedXForwardedFor
 	}
+	remoteAddr = http_proto.ApplyTrustedXForwardedFor(request.Header, trustedXFF, remoteAddr)
 
 	var currentSession *httpSession
 	if sessionId != "" {
@@ -227,8 +216,8 @@ func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Req
 				writer.Header().Set("Cache-Control", "no-store")
 				writer.WriteHeader(http.StatusOK)
 				scStreamUpServerSecs := h.config.GetNormalizedScStreamUpServerSecs()
-				referrer := request.Header.Get("Referer")
-				if referrer != "" && scStreamUpServerSecs.To > 0 {
+				hasLegacyRefererCompatMarker := request.Header.Get("Referer") != ""
+				if (hasLegacyRefererCompatMarker || obfsPaddingAccepted) && scStreamUpServerSecs.To > 0 {
 					go func() {
 						for {
 							_, err := httpSC.Write(bytes.Repeat([]byte{'X'}, int(h.config.GetNormalizedXPaddingBytes().rand())))
@@ -595,9 +584,7 @@ func (ln *Listener) Addr() net.Addr {
 // Close implements net.Listener.Close().
 func (ln *Listener) Close() error {
 	if ln.h3server != nil {
-		if err := ln.h3server.Close(); err != nil {
-			return err
-		}
+		return ln.h3server.Close()
 	} else if ln.listener != nil {
 		return ln.listener.Close()
 	}

transport/internet/splithttp/mux.go

@@ -8,6 +8,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
 )
 
@@ -17,10 +18,27 @@ type XmuxConn interface {
 
 type XmuxClient struct {
 	XmuxConn     XmuxConn
-	OpenUsage    atomic.Int32
+	Running      atomic.Int32
 	leftUsage    int32
 	LeftRequests atomic.Int32
 	UnreusableAt time.Time
+	NotUsed      atomic.Bool
+}
+
+func (c *XmuxClient) AddRunning() {
+	c.Running.Add(1)
+}
+
+func (c *XmuxClient) DoneRunning() {
+	c.Running.Add(-1)
+	c.maybeClose()
+}
+
+// close the XmuxConn if it is not used and has no running requests
+func (c *XmuxClient) maybeClose() {
+	if c.NotUsed.Load() && c.Running.Load() <= 0 {
+		common.Close(c.XmuxConn)
+	}
 }
 
 type XmuxManager struct {
@@ -68,10 +86,12 @@ func (m *XmuxManager) GetXmuxClient(ctx context.Context) *XmuxClient { // when l
 			xmuxClient.LeftRequests.Load() <= 0 ||
 			(xmuxClient.UnreusableAt != time.Time{} && time.Now().After(xmuxClient.UnreusableAt)) {
 			errors.LogDebug(ctx, "XMUX: removing xmuxClient, IsClosed() = ", xmuxClient.XmuxConn.IsClosed(),
-				", OpenUsage = ", xmuxClient.OpenUsage.Load(),
+				", Running = ", xmuxClient.Running.Load(),
 				", leftUsage = ", xmuxClient.leftUsage,
 				", LeftRequests = ", xmuxClient.LeftRequests.Load(),
 				", UnreusableAt = ", xmuxClient.UnreusableAt)
+			xmuxClient.NotUsed.Store(true)
+			xmuxClient.maybeClose()
 			m.xmuxClients = append(m.xmuxClients[:i], m.xmuxClients[i+1:]...)
 		} else {
 			i++
@@ -91,7 +111,7 @@ func (m *XmuxManager) GetXmuxClient(ctx context.Context) *XmuxClient { // when l
 	xmuxClients := make([]*XmuxClient, 0)
 	if m.concurrency > 0 {
 		for _, xmuxClient := range m.xmuxClients {
-			if xmuxClient.OpenUsage.Load() < m.concurrency {
+			if xmuxClient.Running.Load() < m.concurrency {
 				xmuxClients = append(xmuxClients, xmuxClient)
 			}
 		}

transport/internet/splithttp/mux_test.go

@@ -63,7 +63,7 @@ func TestMaxConcurrency(t *testing.T) {
 	xmuxClients := make(map[interface{}]struct{})
 	for i := 0; i < 64; i++ {
 		xmuxClient := xmuxManager.GetXmuxClient(context.Background())
-		xmuxClient.OpenUsage.Add(1)
+		xmuxClient.AddRunning()
 		xmuxClients[xmuxClient] = struct{}{}
 	}
 
@@ -82,7 +82,7 @@ func TestDefault(t *testing.T) {
 	xmuxClients := make(map[interface{}]struct{})
 	for i := 0; i < 64; i++ {
 		xmuxClient := xmuxManager.GetXmuxClient(context.Background())
-		xmuxClient.OpenUsage.Add(1)
+		xmuxClient.AddRunning()
 		xmuxClients[xmuxClient] = struct{}{}
 	}
 

transport/internet/splithttp/splithttp_test.go

@@ -88,6 +88,9 @@ func TestDialWithRemoteAddr(t *testing.T) {
 		ProtocolSettings: &Config{
 			Path: "sh",
 		},
+		SocketSettings: &internet.SocketConfig{
+			TrustedXForwardedFor: []string{"X-Forwarded-For"},
+		},
 	}, func(conn stat.Connection) {
 		go func(c stat.Connection) {
 			defer c.Close()

transport/internet/splithttp/upload_queue.go

@@ -6,27 +6,25 @@ package splithttp
 import (
 	"container/heap"
 	"io"
-	"runtime"
-	"sync"
+	"sync/atomic"
 
 	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/signal/done"
 )
 
 type Packet struct {
-	Reader  io.ReadCloser
+	Reader  *httpServerConn
 	Payload []byte
 	Seq     uint64
 }
 
 type uploadQueue struct {
-	reader          io.ReadCloser
-	nomore          bool
-	pushedPackets   chan Packet
-	writeCloseMutex sync.Mutex
-	heap            uploadHeap
-	nextSeq         uint64
-	closed          bool
-	maxPackets      int
+	reader        atomic.Pointer[httpServerConn]
+	pushedPackets chan Packet
+	heap          uploadHeap
+	nextSeq       uint64
+	maxPackets    int
+	closed        *done.Instance
 }
 
 func NewUploadQueue(maxPackets int) *uploadQueue {
@@ -34,73 +32,53 @@ func NewUploadQueue(maxPackets int) *uploadQueue {
 		pushedPackets: make(chan Packet, maxPackets),
 		heap:          uploadHeap{},
 		nextSeq:       0,
-		closed:        false,
+		closed:        done.New(),
 		maxPackets:    maxPackets,
 	}
 }
 
 func (h *uploadQueue) Push(p Packet) error {
-	h.writeCloseMutex.Lock()
-	defer h.writeCloseMutex.Unlock()
-
-	if h.closed {
-		return errors.New("packet queue closed")
-	}
-	if h.nomore {
+	if h.reader.Load() != nil || (p.Reader != nil && !h.reader.CompareAndSwap(nil, p.Reader)) {
 		return errors.New("h.reader already exists")
 	}
-	if p.Reader != nil {
-		h.nomore = true
+	select {
+	case h.pushedPackets <- p: // no panic
+		if h.closed.Done() {
+			return errors.New("packet queue closed")
+		}
+		return nil
+	case <-h.closed.Wait():
+		return errors.New("packet queue closed")
 	}
-	h.pushedPackets <- p
-	return nil
 }
 
 func (h *uploadQueue) Close() error {
-	h.writeCloseMutex.Lock()
-	defer h.writeCloseMutex.Unlock()
-
-	if !h.closed {
-		h.closed = true
-		runtime.Gosched() // hope Read() gets the packet
-	f:
-		for {
-			select {
-			case p := <-h.pushedPackets:
-				if p.Reader != nil {
-					h.reader = p.Reader
-				}
-			default:
-				break f
-			}
-		}
-		close(h.pushedPackets)
-	}
-	if h.reader != nil {
-		return h.reader.Close()
+	h.closed.Close()
+	if reader := h.reader.Load(); reader != nil {
+		return reader.Close()
 	}
 	return nil
 }
 
 func (h *uploadQueue) Read(b []byte) (int, error) {
-	if h.reader != nil {
-		return h.reader.Read(b)
+	if reader := h.reader.Load(); reader != nil {
+		return reader.Read(b)
 	}
 
-	if h.closed {
+	if h.closed.Done() {
 		return 0, io.EOF
 	}
 
 	if len(h.heap) == 0 {
-		packet, more := <-h.pushedPackets
-		if !more {
+		select {
+		case p := <-h.pushedPackets:
+			if p.Reader != nil {
+				return p.Reader.Read(b)
+			}
+			heap.Push(&h.heap, p)
+		case <-h.closed.Wait():
 			return 0, io.EOF
 		}
-		if packet.Reader != nil {
-			h.reader = packet.Reader
-			return h.reader.Read(b)
-		}
-		heap.Push(&h.heap, packet)
 	}
 
 	for len(h.heap) > 0 {
@@ -131,11 +109,12 @@ func (h *uploadQueue) Read(b []byte) (int, error) {
 				return 0, errors.New("packet queue is too large")
 			}
 			heap.Push(&h.heap, packet)
-			packet2, more := <-h.pushedPackets
-			if !more {
+			select {
+			case p := <-h.pushedPackets:
+				heap.Push(&h.heap, p)
+			case <-h.closed.Wait():
 				return 0, io.EOF
 			}
-			heap.Push(&h.heap, packet2)
 		}
 	}
 

transport/internet/websocket/hub.go

@@ -65,24 +65,12 @@ func (h *requestHandler) ServeHTTP(writer http.ResponseWriter, request *http.Req
 		return
 	}
 
-	var forwardedAddrs []net.Address
-	if h.socketSettings != nil && len(h.socketSettings.TrustedXForwardedFor) > 0 {
-		for _, key := range h.socketSettings.TrustedXForwardedFor {
-			if len(request.Header.Values(key)) > 0 {
-				forwardedAddrs = http_proto.ParseXForwardedFor(request.Header)
-				break
-			}
-		}
-	} else {
-		forwardedAddrs = http_proto.ParseXForwardedFor(request.Header)
-	}
 	remoteAddr := conn.RemoteAddr()
-	if len(forwardedAddrs) > 0 && forwardedAddrs[0].Family().IsIP() {
-		remoteAddr = &net.TCPAddr{
-			IP:   forwardedAddrs[0].IP(),
-			Port: int(0),
-		}
+	var trustedXFF []string
+	if h.socketSettings != nil {
+		trustedXFF = h.socketSettings.TrustedXForwardedFor
 	}
+	remoteAddr = http_proto.ApplyTrustedXForwardedFor(request.Header, trustedXFF, remoteAddr)
 
 	h.ln.addConn(NewConnection(conn, remoteAddr, extraReader, h.ln.config.HeartbeatPeriod))
 }

transport/internet/websocket/ws_test.go

@@ -79,6 +79,9 @@ func TestDialWithRemoteAddr(t *testing.T) {
 		ProtocolSettings: &Config{
 			Path: "ws",
 		},
+		SocketSettings: &internet.SocketConfig{
+			TrustedXForwardedFor: []string{"X-Forwarded-For"},
+		},
 	}, func(conn stat.Connection) {
 		go func(c stat.Connection) {
 			defer c.Close()