v1.4.0

Co-authored-by: JimhHan <50871214+JimhHan@users.noreply.github.com>

.github/build/friendly-filenames.json

@@ -0,0 +1,33 @@
+{
+  "android-arm64": { "friendlyName": "android-arm64-v8a" },
+  "darwin-amd64": { "friendlyName": "macos-64" },
+  "darwin-arm64": { "friendlyName": "macos-arm64-v8a" },
+  "dragonfly-amd64": { "friendlyName": "dragonfly-64" },
+  "freebsd-386": { "friendlyName": "freebsd-32" },
+  "freebsd-amd64": { "friendlyName": "freebsd-64" },
+  "freebsd-arm64": { "friendlyName": "freebsd-arm64-v8a" },
+  "freebsd-arm7": { "friendlyName": "freebsd-arm32-v7a" },
+  "linux-386": { "friendlyName": "linux-32" },
+  "linux-amd64": { "friendlyName": "linux-64" },
+  "linux-arm5": { "friendlyName": "linux-arm32-v5" },
+  "linux-arm64": { "friendlyName": "linux-arm64-v8a" },
+  "linux-arm6": { "friendlyName": "linux-arm32-v6" },
+  "linux-arm7": { "friendlyName": "linux-arm32-v7a" },
+  "linux-mips64le": { "friendlyName": "linux-mips64le" },
+  "linux-mips64": { "friendlyName": "linux-mips64" },
+  "linux-mipslesoftfloat": { "friendlyName": "linux-mips32le-softfloat" },
+  "linux-mipsle": { "friendlyName": "linux-mips32le" },
+  "linux-mipssoftfloat": { "friendlyName": "linux-mips32-softfloat" },
+  "linux-mips": { "friendlyName": "linux-mips32" },
+  "linux-ppc64le": { "friendlyName": "linux-ppc64le" },
+  "linux-ppc64": { "friendlyName": "linux-ppc64" },
+  "linux-riscv64": { "friendlyName": "linux-riscv64" },
+  "linux-s390x": { "friendlyName": "linux-s390x" },
+  "openbsd-386": { "friendlyName": "openbsd-32" },
+  "openbsd-amd64": { "friendlyName": "openbsd-64" },
+  "openbsd-arm64": { "friendlyName": "openbsd-arm64-v8a" },
+  "openbsd-arm7": { "friendlyName": "openbsd-arm32-v7a" },
+  "windows-386": { "friendlyName": "windows-32" },
+  "windows-amd64": { "friendlyName": "windows-64" },
+  "windows-arm7": { "friendlyName": "windows-arm32-v7a" }
+}

.github/workflows/release.yml

@@ -0,0 +1,204 @@
+name: Build and Release
+
+on:
+  workflow_dispatch:
+  release:
+    types: [published]
+  push:
+    branches:
+      - main
+    paths:
+      - "**/*.go"
+      - "go.mod"
+      - "go.sum"
+      - ".github/workflows/*.yml"
+  pull_request:
+    types: [opened, synchronize, reopened]
+    paths:
+      - "**/*.go"
+      - "go.mod"
+      - "go.sum"
+      - ".github/workflows/*.yml"
+jobs:
+  build:
+    strategy:
+      matrix:
+        # Include amd64 on all platforms.
+        goos: [windows, freebsd, openbsd, linux, dragonfly, darwin]
+        goarch: [amd64, 386]
+        exclude:
+          # Exclude i386 on darwin and dragonfly.
+          - goarch: 386
+            goos: dragonfly
+          - goarch: 386
+            goos: darwin
+        include:
+          # BEIGIN MacOS ARM64
+          - goos: darwin
+            goarch: arm64
+          # END MacOS ARM64
+          # BEGIN Linux ARM 5 6 7
+          - goos: linux
+            goarch: arm
+            goarm: 7
+          - goos: linux
+            goarch: arm
+            goarm: 6
+          - goos: linux
+            goarch: arm
+            goarm: 5
+          # END Linux ARM 5 6 7
+          # BEGIN Android ARM 8
+          - goos: android
+            goarch: arm64
+          # END Android ARM 8
+          # Windows ARM 7
+          - goos: windows
+            goarch: arm
+            goarm: 7
+          # BEGIN Other architectures
+          # BEGIN riscv64 & ARM64
+          - goos: linux
+            goarch: arm64
+          - goos: linux
+            goarch: riscv64
+          # END riscv64 & ARM64
+          # BEGIN MIPS
+          - goos: linux
+            goarch: mips64
+          - goos: linux
+            goarch: mips64le
+          - goos: linux
+            goarch: mipsle
+          - goos: linux
+            goarch: mips
+          # END MIPS
+          # BEGIN PPC
+          - goos: linux
+            goarch: ppc64
+          - goos: linux
+            goarch: ppc64le
+          # END PPC
+          # BEGIN FreeBSD ARM
+          - goos: freebsd
+            goarch: arm64
+          - goos: freebsd
+            goarch: arm
+            goarm: 7
+          # END FreeBSD ARM
+          # BEGIN S390X
+          - goos: linux
+            goarch: s390x
+          # END S390X
+          # END Other architectures
+          # BEGIN OPENBSD ARM
+          - goos: openbsd
+            goarch: arm64
+          - goos: openbsd
+            goarch: arm
+            goarm: 7
+          # END OPENBSD ARM
+      fail-fast: false
+
+    runs-on: ubuntu-latest
+    env:
+      GOOS: ${{ matrix.goos }}
+      GOARCH: ${{ matrix.goarch }}
+      GOARM: ${{ matrix.goarm }}
+      CGO_ENABLED: 0
+    steps:
+      - name: Checkout codebase
+        uses: actions/checkout@v2
+
+      - name: Show workflow information 
+        id: get_filename
+        run: |
+          export _NAME=$(jq ".[\"$GOOS-$GOARCH$GOARM$GOMIPS\"].friendlyName" -r < .github/build/friendly-filenames.json)
+          echo "GOOS: $GOOS, GOARCH: $GOARCH, GOARM: $GOARM, GOMIPS: $GOMIPS, RELEASE_NAME: $_NAME"
+          echo "::set-output name=ASSET_NAME::$_NAME"
+          echo "ASSET_NAME=$_NAME" >> $GITHUB_ENV
+
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ^1.16
+
+      - name: Get project dependencies
+        run: go mod download
+      
+      - name: Replace Custom to Commit ID
+        if: github.event_name != 'release'
+        run: |
+          ID=$(git rev-parse --short ${{ github.sha }})
+          if [ "${{ github.event_name }}" == 'pull_request' ]
+          then
+            ID=$(git rev-parse --short ${{ github.event.pull_request.head.sha }})
+          fi
+          sed -i '/build/ s/Custom/'$ID'/' ./core/core.go
+ 
+      - name: Build Xray
+        run: |
+          mkdir -p build_assets
+          go build -v -o build_assets/xray -trimpath -ldflags "-s -w -buildid=" ./main
+    
+      - name: Build Mips softfloat Xray
+        if: matrix.goarch == 'mips' || matrix.goarch == 'mipsle'
+        run: |
+          GOMIPS=softfloat go build -v -o build_assets/xray_softfloat -trimpath -ldflags "-s -w -buildid=" ./main
+
+      - name: Rename Windows Xray
+        if: matrix.goos == 'windows'
+        run: |
+          cd ./build_assets || exit 1
+          mv xray xray.exe
+
+      - name: Prepare to release
+        run: |
+          cp ${GITHUB_WORKSPACE}/README.md ./build_assets/README.md
+          cp ${GITHUB_WORKSPACE}/LICENSE ./build_assets/LICENSE
+          LIST=('geoip geoip geoip' 'domain-list-community dlc geosite')
+          for i in "${LIST[@]}"
+          do
+            INFO=($(echo $i | awk 'BEGIN{FS=" ";OFS=" "} {print $1,$2,$3}'))
+            LASTEST_TAG="$(curl -sL "https://api.github.com/repos/v2fly/${INFO[0]}/releases" | jq -r ".[0].tag_name" || echo "latest")"
+            FILE_NAME="${INFO[2]}.dat"
+            echo -e "Downloading ${FILE_NAME}..."
+            curl -L "https://github.com/v2fly/${INFO[0]}/releases/download/${LASTEST_TAG}/${INFO[1]}.dat" -o ./build_assets/${FILE_NAME}
+            echo -e "Verifying HASH key..."
+            HASH="$(curl -sL "https://github.com/v2fly/${INFO[0]}/releases/download/${LASTEST_TAG}/${INFO[1]}.dat.sha256sum" | awk -F ' ' '{print $1}')"
+            [ "$(sha256sum "./build_assets/${FILE_NAME}" | awk -F ' ' '{print $1}')" == "${HASH}" ] || { echo -e "The HASH key of ${FILE_NAME} does not match cloud one."; exit 1; }
+          done
+
+      - name: Create ZIP archive
+        shell: bash
+        run: |
+          pushd build_assets || exit 1
+          touch -mt $(date +%Y01010000) *
+          zip -9vr ../Xray-$ASSET_NAME.zip .
+          popd || exit 1
+          FILE=./Xray-$ASSET_NAME.zip
+          DGST=$FILE.dgst
+          for METHOD in {"md5","sha1","sha256","sha512"}
+          do
+            openssl dgst -$METHOD $FILE | sed 's/([^)]*)//g' >>$DGST
+          done
+
+      - name: Change the name
+        run: |
+          mv build_assets Xray-$ASSET_NAME
+
+      - name: Upload files to Artifacts
+        uses: actions/upload-artifact@v2
+        with:
+          name: Xray-${{ steps.get_filename.outputs.ASSET_NAME }}
+          path: |
+            ./Xray-${{ steps.get_filename.outputs.ASSET_NAME }}/*
+
+      - name: Upload binaries to release
+        uses: svenstaro/upload-release-action@v2
+        if: github.event_name == 'release'
+        with:
+          repo_token: ${{ secrets.GITHUB_TOKEN }}
+          file: ./Xray-${{ steps.get_filename.outputs.ASSET_NAME }}.zip*
+          tag: ${{ github.ref }}
+          file_glob: true

.github/workflows/test.yml

@@ -0,0 +1,48 @@
+name: Test
+
+on:
+  push:
+    branches:
+      - main
+    paths:
+      - "**/*.go"
+      - "go.mod"
+      - "go.sum"
+      - ".github/workflows/*.yml"
+  pull_request:
+    types: [opened, synchronize, reopened]
+    paths:
+      - "**/*.go"
+      - "go.mod"
+      - "go.sum"
+      - ".github/workflows/*.yml"
+
+jobs:
+  test:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      fail-fast: false
+      matrix:
+        os: [windows-latest, ubuntu-latest, macos-latest]
+    steps:
+      - name: Set up Go
+        uses: actions/setup-go@v2
+        with:
+          go-version: ^1.16
+      - name: Checkout codebase
+        uses: actions/checkout@v2
+
+      - name: Prepare geo*dat
+        if: ${{ matrix.os != 'windows-latest' }}
+        run: |
+          mkdir resources
+          wget -O ./resources/geoip.dat https://github.com/v2fly/geoip/releases/latest/download/geoip.dat
+          wget -O ./resources/geosite.dat https://github.com/v2fly/domain-list-community/releases/latest/download/dlc.dat
+      - name: Prepare geo*dat for Windows
+        if: ${{ matrix.os == 'windows-latest' }}
+        run: |
+          mkdir resources
+          Invoke-WebRequest -Uri "https://github.com/v2fly/geoip/releases/latest/download/geoip.dat" -OutFile "./resources/geoip.dat"
+          Invoke-WebRequest -Uri "https://github.com/v2fly/domain-list-community/releases/latest/download/dlc.dat" -OutFile "./resources/geosite.dat"
+      - name: Test
+        run: go test -timeout 1h -v ./...

README.md

@@ -17,6 +17,8 @@
 - One Click
   - [ProxySU](https://github.com/proxysu/ProxySU)
   - [v2ray-agent](https://github.com/mack-a/v2ray-agent)
+  - [Xray-yes](https://github.com/jiuqi9997/Xray-yes)
+  - [Xray_onekey](https://github.com/wulabing/Xray_onekey)
 - Magisk
   - [Xray4Magisk](https://github.com/CerteKim/Xray4Magisk)
   - [Xray_For_Magisk](https://github.com/E7KMbb/Xray_For_Magisk)
@@ -34,9 +36,11 @@
   - [PassWall](https://github.com/xiaorouji/openwrt-passwall)
   - [Hello World](https://github.com/jerrykuku/luci-app-vssr)
   - [ShadowSocksR Plus+](https://github.com/fw876/helloworld)
+  - [luci-app-xray](https://github.com/yichya/luci-app-xray) ([openwrt-xray](https://github.com/yichya/openwrt-xray))
 - Windows
   - [v2rayN](https://github.com/2dust/v2rayN)
   - [Qv2ray](https://github.com/Qv2ray/Qv2ray)
+  - [Netch (NetFilter & TUN/TAP)](https://github.com/NetchX/Netch)
 - Android
   - [v2rayNG](https://github.com/2dust/v2rayNG)
   - [Kitsunebi](https://github.com/rurirei/Kitsunebi/tree/release_xtls)

app/dispatcher/default.go

@@ -15,6 +15,7 @@ import (
 	"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/dns"
 	"github.com/xtls/xray-core/features/outbound"
 	"github.com/xtls/xray-core/features/policy"
 	"github.com/xtls/xray-core/features/routing"
@@ -175,17 +176,28 @@ func (d *DefaultDispatcher) getLink(ctx context.Context) (*transport.Link, *tran
 	return inboundLink, outboundLink
 }
 
-func shouldOverride(result SniffResult, request session.SniffingRequest) bool {
+func shouldOverride(ctx context.Context, result SniffResult, request session.SniffingRequest, destination net.Destination) bool {
 	domain := result.Domain()
 	for _, d := range request.ExcludeForDomain {
 		if domain == d {
 			return false
 		}
 	}
-
-	protocol := result.Protocol()
+	var fakeDNSEngine dns.FakeDNSEngine
+	core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
+		fakeDNSEngine = fdns
+	})
+	protocolString := result.Protocol()
+	if resComp, ok := result.(SnifferResultComposite); ok {
+		protocolString = resComp.ProtocolForDomainResult()
+	}
 	for _, p := range request.OverrideDestinationForProtocol {
-		if strings.HasPrefix(protocol, p) {
+		if strings.HasPrefix(protocolString, p) {
+			return true
+		}
+		if fakeDNSEngine != nil && protocolString != "bittorrent" && p == "fakedns" &&
+			fakeDNSEngine.GetFakeIPRange().Contains(destination.Address.IP()) {
+			newError("Using sniffer ", protocolString, " since the fake DNS missed").WriteToLog(session.ExportIDToError(ctx))
 			return true
 		}
 	}
@@ -210,19 +222,33 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
 		ctx = session.ContextWithContent(ctx, content)
 	}
 	sniffingRequest := content.SniffingRequest
-	if destination.Network != net.Network_TCP || !sniffingRequest.Enabled {
+	switch {
+	case !sniffingRequest.Enabled:
 		go d.routedDispatch(ctx, outbound, destination)
-	} else {
+	case destination.Network != net.Network_TCP:
+		// Only metadata sniff will be used for non tcp connection
+		result, err := sniffer(ctx, nil, true)
+		if err == nil {
+			content.Protocol = result.Protocol()
+			if shouldOverride(ctx, result, sniffingRequest, destination) {
+				domain := result.Domain()
+				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
+				destination.Address = net.ParseAddress(domain)
+				ob.Target = destination
+			}
+		}
+		go d.routedDispatch(ctx, outbound, destination)
+	default:
 		go func() {
 			cReader := &cachedReader{
 				reader: outbound.Reader.(*pipe.Reader),
 			}
 			outbound.Reader = cReader
-			result, err := sniffer(ctx, cReader)
+			result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly)
 			if err == nil {
 				content.Protocol = result.Protocol()
 			}
-			if err == nil && shouldOverride(result, sniffingRequest) {
+			if err == nil && shouldOverride(ctx, result, sniffingRequest, destination) {
 				domain := result.Domain()
 				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
 				destination.Address = net.ParseAddress(domain)
@@ -234,34 +260,50 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
 	return inbound, nil
 }
 
-func sniffer(ctx context.Context, cReader *cachedReader) (SniffResult, error) {
+func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (SniffResult, error) {
 	payload := buf.New()
 	defer payload.Release()
 
-	sniffer := NewSniffer()
-	totalAttempt := 0
-	for {
-		select {
-		case <-ctx.Done():
-			return nil, ctx.Err()
-		default:
-			totalAttempt++
-			if totalAttempt > 2 {
-				return nil, errSniffingTimeout
-			}
+	sniffer := NewSniffer(ctx)
 
-			cReader.Cache(payload)
-			if !payload.IsEmpty() {
-				result, err := sniffer.Sniff(payload.Bytes())
-				if err != common.ErrNoClue {
-					return result, err
+	metaresult, metadataErr := sniffer.SniffMetadata(ctx)
+
+	if metadataOnly {
+		return metaresult, metadataErr
+	}
+
+	contentResult, contentErr := func() (SniffResult, error) {
+		totalAttempt := 0
+		for {
+			select {
+			case <-ctx.Done():
+				return nil, ctx.Err()
+			default:
+				totalAttempt++
+				if totalAttempt > 2 {
+					return nil, errSniffingTimeout
+				}
+
+				cReader.Cache(payload)
+				if !payload.IsEmpty() {
+					result, err := sniffer.Sniff(ctx, payload.Bytes())
+					if err != common.ErrNoClue {
+						return result, err
+					}
+				}
+				if payload.IsFull() {
+					return nil, errUnknownContent
 				}
 			}
-			if payload.IsFull() {
-				return nil, errUnknownContent
-			}
 		}
+	}()
+	if contentErr != nil && metadataErr == nil {
+		return metaresult, nil
 	}
+	if contentErr == nil && metadataErr == nil {
+		return CompositeResult(metaresult, contentResult), nil
+	}
+	return contentResult, contentErr
 }
 
 func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.Link, destination net.Destination) {

app/dispatcher/fakednssniffer.go

@@ -0,0 +1,49 @@
+package dispatcher
+
+import (
+	"context"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features/dns"
+)
+
+// newFakeDNSSniffer Create a Fake DNS metadata sniffer
+func newFakeDNSSniffer(ctx context.Context) (protocolSnifferWithMetadata, error) {
+	var fakeDNSEngine dns.FakeDNSEngine
+	err := core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
+		fakeDNSEngine = fdns
+	})
+	if err != nil {
+		return protocolSnifferWithMetadata{}, err
+	}
+	if fakeDNSEngine == nil {
+		errNotInit := newError("FakeDNSEngine is not initialized, but such a sniffer is used").AtError()
+		return protocolSnifferWithMetadata{}, errNotInit
+	}
+	return protocolSnifferWithMetadata{protocolSniffer: func(ctx context.Context, bytes []byte) (SniffResult, error) {
+		Target := session.OutboundFromContext(ctx).Target
+		if Target.Network == net.Network_TCP || Target.Network == net.Network_UDP {
+			domainFromFakeDNS := fakeDNSEngine.GetDomainFromFakeDNS(Target.Address)
+			if domainFromFakeDNS != "" {
+				newError("fake dns got domain: ", domainFromFakeDNS, " for ip: ", Target.Address.String()).WriteToLog(session.ExportIDToError(ctx))
+				return &fakeDNSSniffResult{domainName: domainFromFakeDNS}, nil
+			}
+		}
+		return nil, common.ErrNoClue
+	}, metadataSniffer: true}, nil
+}
+
+type fakeDNSSniffResult struct {
+	domainName string
+}
+
+func (fakeDNSSniffResult) Protocol() string {
+	return "fakedns"
+}
+
+func (f fakeDNSSniffResult) Domain() string {
+	return f.domainName
+}

app/dispatcher/sniffer.go

@@ -1,6 +1,8 @@
 package dispatcher
 
 import (
+	"context"
+
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/protocol/bittorrent"
 	"github.com/xtls/xray-core/common/protocol/http"
@@ -12,30 +14,46 @@ type SniffResult interface {
 	Domain() string
 }
 
-type protocolSniffer func([]byte) (SniffResult, error)
+type protocolSniffer func(context.Context, []byte) (SniffResult, error)
 
-type Sniffer struct {
-	sniffer []protocolSniffer
+type protocolSnifferWithMetadata struct {
+	protocolSniffer protocolSniffer
+	// A Metadata sniffer will be invoked on connection establishment only, with nil body,
+	// for both TCP and UDP connections
+	// It will not be shown as a traffic type for routing unless there is no other successful sniffing.
+	metadataSniffer bool
 }
 
-func NewSniffer() *Sniffer {
-	return &Sniffer{
-		sniffer: []protocolSniffer{
-			func(b []byte) (SniffResult, error) { return http.SniffHTTP(b) },
-			func(b []byte) (SniffResult, error) { return tls.SniffTLS(b) },
-			func(b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) },
+type Sniffer struct {
+	sniffer []protocolSnifferWithMetadata
+}
+
+func NewSniffer(ctx context.Context) *Sniffer {
+	ret := &Sniffer{
+		sniffer: []protocolSnifferWithMetadata{
+			{func(c context.Context, b []byte) (SniffResult, error) { return http.SniffHTTP(b) }, false},
+			{func(c context.Context, b []byte) (SniffResult, error) { return tls.SniffTLS(b) }, false},
+			{func(c context.Context, b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) }, false},
 		},
 	}
+	if sniffer, err := newFakeDNSSniffer(ctx); err == nil {
+		ret.sniffer = append(ret.sniffer, sniffer)
+	}
+	return ret
 }
 
 var errUnknownContent = newError("unknown content")
 
-func (s *Sniffer) Sniff(payload []byte) (SniffResult, error) {
-	var pendingSniffer []protocolSniffer
-	for _, s := range s.sniffer {
-		result, err := s(payload)
+func (s *Sniffer) Sniff(c context.Context, payload []byte) (SniffResult, error) {
+	var pendingSniffer []protocolSnifferWithMetadata
+	for _, si := range s.sniffer {
+		s := si.protocolSniffer
+		if si.metadataSniffer {
+			continue
+		}
+		result, err := s(c, payload)
 		if err == common.ErrNoClue {
-			pendingSniffer = append(pendingSniffer, s)
+			pendingSniffer = append(pendingSniffer, si)
 			continue
 		}
 
@@ -51,3 +69,55 @@ func (s *Sniffer) Sniff(payload []byte) (SniffResult, error) {
 
 	return nil, errUnknownContent
 }
+
+func (s *Sniffer) SniffMetadata(c context.Context) (SniffResult, error) {
+	var pendingSniffer []protocolSnifferWithMetadata
+	for _, si := range s.sniffer {
+		s := si.protocolSniffer
+		if !si.metadataSniffer {
+			pendingSniffer = append(pendingSniffer, si)
+			continue
+		}
+		result, err := s(c, nil)
+		if err == common.ErrNoClue {
+			pendingSniffer = append(pendingSniffer, si)
+			continue
+		}
+
+		if err == nil && result != nil {
+			return result, nil
+		}
+	}
+
+	if len(pendingSniffer) > 0 {
+		s.sniffer = pendingSniffer
+		return nil, common.ErrNoClue
+	}
+
+	return nil, errUnknownContent
+}
+
+func CompositeResult(domainResult SniffResult, protocolResult SniffResult) SniffResult {
+	return &compositeResult{domainResult: domainResult, protocolResult: protocolResult}
+}
+
+type compositeResult struct {
+	domainResult   SniffResult
+	protocolResult SniffResult
+}
+
+func (c compositeResult) Protocol() string {
+	return c.protocolResult.Protocol()
+}
+
+func (c compositeResult) Domain() string {
+	return c.domainResult.Domain()
+}
+
+func (c compositeResult) ProtocolForDomainResult() string {
+	return c.domainResult.Protocol()
+}
+
+type SnifferResultComposite interface {
+	ProtocolForDomainResult() string
+}

app/dns/config.proto

@@ -68,4 +68,6 @@ message Config {
 
   // Tag is the inbound tag of DNS client.
   string tag = 6;
+
+  reserved 7;
 }

app/dns/dnscommon.go

@@ -2,6 +2,7 @@ package dns
 
 import (
 	"encoding/binary"
+	"strings"
 	"time"
 
 	"github.com/xtls/xray-core/common"
@@ -13,7 +14,7 @@ import (
 
 // Fqdn normalize domain make sure it ends with '.'
 func Fqdn(domain string) string {
-	if len(domain) > 0 && domain[len(domain)-1] == '.' {
+	if len(domain) > 0 && strings.HasSuffix(domain, ".") {
 		return domain
 	}
 	return domain + "."
@@ -112,7 +113,7 @@ func genEDNS0Options(clientIP net.IP) *dnsmessage.Resource {
 	return opt
 }
 
-func buildReqMsgs(domain string, option IPOption, reqIDGen func() uint16, reqOpts *dnsmessage.Resource) []*dnsRequest {
+func buildReqMsgs(domain string, option dns_feature.IPOption, reqIDGen func() uint16, reqOpts *dnsmessage.Resource) []*dnsRequest {
 	qA := dnsmessage.Question{
 		Name:  dnsmessage.MustNewName(domain),
 		Type:  dnsmessage.TypeA,

app/dns/dnscommon_test.go

@@ -9,6 +9,7 @@ import (
 	"github.com/miekg/dns"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
+	dns_feature "github.com/xtls/xray-core/features/dns"
 	"golang.org/x/net/dns/dnsmessage"
 )
 
@@ -92,7 +93,7 @@ func Test_buildReqMsgs(t *testing.T) {
 	}
 	type args struct {
 		domain  string
-		option  IPOption
+		option  dns_feature.IPOption
 		reqOpts *dnsmessage.Resource
 	}
 	tests := []struct {
@@ -100,10 +101,26 @@ func Test_buildReqMsgs(t *testing.T) {
 		args args
 		want int
 	}{
-		{"dual stack", args{"test.com", IPOption{true, true}, nil}, 2},
-		{"ipv4 only", args{"test.com", IPOption{true, false}, nil}, 1},
-		{"ipv6 only", args{"test.com", IPOption{false, true}, nil}, 1},
-		{"none/error", args{"test.com", IPOption{false, false}, nil}, 0},
+		{"dual stack", args{"test.com", dns_feature.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		}, nil}, 2},
+		{"ipv4 only", args{"test.com", dns_feature.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: false,
+			FakeEnable: false,
+		}, nil}, 1},
+		{"ipv6 only", args{"test.com", dns_feature.IPOption{
+			IPv4Enable: false,
+			IPv6Enable: true,
+			FakeEnable: false,
+		}, nil}, 1},
+		{"none/error", args{"test.com", dns_feature.IPOption{
+			IPv4Enable: false,
+			IPv6Enable: false,
+			FakeEnable: false,
+		}, nil}, 0},
 	}
 	for _, tt := range tests {
 		t.Run(tt.name, func(t *testing.T) {

app/dns/dohdns.go

@@ -13,6 +13,7 @@ import (
 	"time"
 
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/common/protocol/dns"
@@ -47,6 +48,56 @@ func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, clientIP net.
 	s := baseDOHNameServer(url, "DOH", clientIP)
 
 	s.dispatcher = dispatcher
+	tr := &http.Transport{
+		MaxIdleConns:        30,
+		IdleConnTimeout:     90 * time.Second,
+		TLSHandshakeTimeout: 30 * time.Second,
+		ForceAttemptHTTP2:   true,
+		DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+			dispatcherCtx := context.Background()
+
+			dest, err := net.ParseDestination(network + ":" + addr)
+			if err != nil {
+				return nil, err
+			}
+
+			dispatcherCtx = session.ContextWithContent(dispatcherCtx, &session.Content{Protocol: "tls"})
+			dispatcherCtx = log.ContextWithAccessMessage(dispatcherCtx, &log.AccessMessage{
+				From:   "DoH",
+				To:     s.dohURL,
+				Status: log.AccessAccepted,
+				Reason: "",
+			})
+
+			link, err := s.dispatcher.Dispatch(dispatcherCtx, dest)
+			select {
+			case <-ctx.Done():
+				return nil, ctx.Err()
+			default:
+
+			}
+			if err != nil {
+				return nil, err
+			}
+
+			cc := common.ChainedClosable{}
+			if cw, ok := link.Writer.(common.Closable); ok {
+				cc = append(cc, cw)
+			}
+			if cr, ok := link.Reader.(common.Closable); ok {
+				cc = append(cc, cr)
+			}
+			return cnc.NewConnection(
+				cnc.ConnectionInputMulti(link.Writer),
+				cnc.ConnectionOutputMulti(link.Reader),
+				cnc.ConnectionOnClose(cc),
+			), nil
+		},
+	}
+	s.httpClient = &http.Client{
+		Timeout:   time.Second * 180,
+		Transport: tr,
+	}
 
 	return s, nil
 }
@@ -64,6 +115,12 @@ func NewDoHLocalNameServer(url *url.URL, clientIP net.IP) *DoHNameServer {
 				return nil, err
 			}
 			conn, err := internet.DialSystem(ctx, dest, nil)
+			log.Record(&log.AccessMessage{
+				From:   "DoH",
+				To:     s.dohURL,
+				Status: log.AccessAccepted,
+				Detour: "local",
+			})
 			if err != nil {
 				return nil, err
 			}
@@ -177,7 +234,7 @@ func (s *DoHNameServer) newReqID() uint16 {
 	return uint16(atomic.AddUint32(&s.reqID, 1))
 }
 
-func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, option IPOption) {
+func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, option dns_feature.IPOption) {
 	newError(s.name, " querying: ", domain).AtInfo().WriteToLog(session.ExportIDToError(ctx))
 
 	if s.name+"." == "DOH//"+domain {
@@ -249,41 +306,6 @@ func (s *DoHNameServer) dohHTTPSContext(ctx context.Context, b []byte) ([]byte,
 
 	hc := s.httpClient
 
-	// Dispatched connection will be closed (interrupted) after each request
-	// This makes DOH inefficient without a keep-alived connection
-	// See: core/app/proxyman/outbound/handler.go:113
-	// Using mux (https request wrapped in a stream layer) improves the situation.
-	// Recommend to use NewDoHLocalNameServer (DOHL:) if xray instance is running on
-	//  a normal network eg. the server side of xray
-
-	if s.dispatcher != nil {
-		tr := &http.Transport{
-			MaxIdleConns:        30,
-			IdleConnTimeout:     90 * time.Second,
-			TLSHandshakeTimeout: 30 * time.Second,
-			ForceAttemptHTTP2:   true,
-			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
-				dest, err := net.ParseDestination(network + ":" + addr)
-				if err != nil {
-					return nil, err
-				}
-
-				link, err := s.dispatcher.Dispatch(ctx, dest)
-				if err != nil {
-					return nil, err
-				}
-				return cnc.NewConnection(
-					cnc.ConnectionInputMulti(link.Writer),
-					cnc.ConnectionOutputMulti(link.Reader),
-				), nil
-			},
-		}
-		hc = &http.Client{
-			Timeout:   time.Second * 180,
-			Transport: tr,
-		}
-	}
-
 	resp, err := hc.Do(req.WithContext(ctx))
 	if err != nil {
 		return nil, err
@@ -298,7 +320,7 @@ func (s *DoHNameServer) dohHTTPSContext(ctx context.Context, b []byte) ([]byte,
 	return ioutil.ReadAll(resp.Body)
 }
 
-func (s *DoHNameServer) findIPsForDomain(domain string, option IPOption) ([]net.IP, error) {
+func (s *DoHNameServer) findIPsForDomain(domain string, option dns_feature.IPOption) ([]net.IP, error) {
 	s.RLock()
 	record, found := s.ips[domain]
 	s.RUnlock()
@@ -341,12 +363,13 @@ func (s *DoHNameServer) findIPsForDomain(domain string, option IPOption) ([]net.
 }
 
 // QueryIP is called from dns.Server->queryIPTimeout
-func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, option IPOption) ([]net.IP, error) {
+func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, option dns_feature.IPOption) ([]net.IP, error) { // nolint: dupl
 	fqdn := Fqdn(domain)
 
 	ips, err := s.findIPsForDomain(fqdn, option)
 	if err != errRecordNotFound {
 		newError(s.name, " cache HIT ", domain, " -> ", ips).Base(err).AtDebug().WriteToLog()
+		log.Record(&log.DNSLog{s.name, domain, ips, log.DNSCacheHit, 0, err})
 		return ips, err
 	}
 
@@ -377,10 +400,12 @@ func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, option IPOpt
 		close(done)
 	}()
 	s.sendQuery(ctx, fqdn, option)
+	start := time.Now()
 
 	for {
 		ips, err := s.findIPsForDomain(fqdn, option)
 		if err != errRecordNotFound {
+			log.Record(&log.DNSLog{s.name, domain, ips, log.DNSQueried, time.Since(start), err})
 			return ips, err
 		}
 

app/dns/fakedns/errors.generated.go

@@ -0,0 +1,9 @@
+package fakedns
+
+import "github.com/xtls/xray-core/common/errors"
+
+type errPathObjHolder struct{}
+
+func newError(values ...interface{}) *errors.Error {
+	return errors.New(values...).WithPathObj(errPathObjHolder{})
+}

app/dns/fakedns/fake.go

@@ -0,0 +1,134 @@
+package fakedns
+
+import (
+	"context"
+	"math"
+	"math/big"
+	gonet "net"
+	"time"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/cache"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/features/dns"
+)
+
+type Holder struct {
+	domainToIP cache.Lru
+	ipRange    *gonet.IPNet
+
+	config *FakeDnsPool
+}
+
+func (*Holder) Type() interface{} {
+	return (*dns.FakeDNSEngine)(nil)
+}
+
+func (fkdns *Holder) Start() error {
+	return fkdns.initializeFromConfig()
+}
+
+func (fkdns *Holder) Close() error {
+	fkdns.domainToIP = nil
+	fkdns.ipRange = nil
+	return nil
+}
+
+func NewFakeDNSHolder() (*Holder, error) {
+	var fkdns *Holder
+	var err error
+
+	if fkdns, err = NewFakeDNSHolderConfigOnly(nil); err != nil {
+		return nil, newError("Unable to create Fake Dns Engine").Base(err).AtError()
+	}
+	err = fkdns.initialize(dns.FakeIPPool, 65535)
+	if err != nil {
+		return nil, err
+	}
+	return fkdns, nil
+}
+
+func NewFakeDNSHolderConfigOnly(conf *FakeDnsPool) (*Holder, error) {
+	return &Holder{nil, nil, conf}, nil
+}
+
+func (fkdns *Holder) initializeFromConfig() error {
+	return fkdns.initialize(fkdns.config.IpPool, int(fkdns.config.LruSize))
+}
+
+func (fkdns *Holder) initialize(ipPoolCidr string, lruSize int) error {
+	var ipRange *gonet.IPNet
+	var err error
+
+	if _, ipRange, err = gonet.ParseCIDR(ipPoolCidr); err != nil {
+		return newError("Unable to parse CIDR for Fake DNS IP assignment").Base(err).AtError()
+	}
+
+	ones, bits := ipRange.Mask.Size()
+	rooms := bits - ones
+	if math.Log2(float64(lruSize)) >= float64(rooms) {
+		return newError("LRU size is bigger than subnet size").AtError()
+	}
+	fkdns.domainToIP = cache.NewLru(lruSize)
+	fkdns.ipRange = ipRange
+	return nil
+}
+
+// GetFakeIPForDomain check and generate a fake IP for a domain name
+func (fkdns *Holder) GetFakeIPForDomain(domain string) []net.Address {
+	if v, ok := fkdns.domainToIP.Get(domain); ok {
+		return []net.Address{v.(net.Address)}
+	}
+	var currentTimeMillis = uint64(time.Now().UnixNano() / 1e6)
+	ones, bits := fkdns.ipRange.Mask.Size()
+	rooms := bits - ones
+	if rooms < 64 {
+		currentTimeMillis %= (uint64(1) << rooms)
+	}
+	var bigIntIP = big.NewInt(0).SetBytes(fkdns.ipRange.IP)
+	bigIntIP = bigIntIP.Add(bigIntIP, new(big.Int).SetUint64(currentTimeMillis))
+	var ip net.Address
+	for {
+		ip = net.IPAddress(bigIntIP.Bytes())
+
+		// if we run for a long time, we may go back to beginning and start seeing the IP in use
+		if _, ok := fkdns.domainToIP.PeekKeyFromValue(ip); !ok {
+			break
+		}
+
+		bigIntIP = bigIntIP.Add(bigIntIP, big.NewInt(1))
+		if !fkdns.ipRange.Contains(bigIntIP.Bytes()) {
+			bigIntIP = big.NewInt(0).SetBytes(fkdns.ipRange.IP)
+		}
+	}
+	fkdns.domainToIP.Put(domain, ip)
+	return []net.Address{ip}
+}
+
+// GetDomainFromFakeDNS check if an IP is a fake IP and have corresponding domain name
+func (fkdns *Holder) GetDomainFromFakeDNS(ip net.Address) string {
+	if !ip.Family().IsIP() || !fkdns.ipRange.Contains(ip.IP()) {
+		return ""
+	}
+	if k, ok := fkdns.domainToIP.GetKeyFromValue(ip); ok {
+		return k.(string)
+	}
+	newError("A fake ip request to ", ip, ", however there is no matching domain name in fake DNS").AtInfo().WriteToLog()
+	return ""
+}
+
+// GetFakeIPRange return fake IP range from configuration
+func (fkdns *Holder) GetFakeIPRange() *gonet.IPNet {
+	return fkdns.ipRange
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*FakeDnsPool)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		var f *Holder
+		var err error
+		if f, err = NewFakeDNSHolderConfigOnly(config.(*FakeDnsPool)); err != nil {
+			return nil, err
+		}
+		return f, nil
+	}))
+}

app/dns/fakedns/fakedns.go

@@ -0,0 +1,3 @@
+package fakedns
+
+//go:generate go run github.com/xtls/xray-core/common/errors/errorgen

app/dns/fakedns/fakedns.pb.go

@@ -0,0 +1,164 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.25.0
+// 	protoc        v3.13.0
+// source: app/dns/fakedns/fakedns.proto
+
+package fakedns
+
+import (
+	proto "github.com/golang/protobuf/proto"
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+// This is a compile-time assertion that a sufficiently up-to-date version
+// of the legacy proto package is being used.
+const _ = proto.ProtoPackageIsVersion4
+
+type FakeDnsPool struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	IpPool  string `protobuf:"bytes,1,opt,name=ip_pool,json=ipPool,proto3" json:"ip_pool,omitempty"` //CIDR of IP pool used as fake DNS IP
+	LruSize int64  `protobuf:"varint,2,opt,name=lruSize,proto3" json:"lruSize,omitempty"`            //Size of Pool for remembering relationship between domain name and IP address
+}
+
+func (x *FakeDnsPool) Reset() {
+	*x = FakeDnsPool{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_dns_fakedns_fakedns_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *FakeDnsPool) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*FakeDnsPool) ProtoMessage() {}
+
+func (x *FakeDnsPool) ProtoReflect() protoreflect.Message {
+	mi := &file_app_dns_fakedns_fakedns_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use FakeDnsPool.ProtoReflect.Descriptor instead.
+func (*FakeDnsPool) Descriptor() ([]byte, []int) {
+	return file_app_dns_fakedns_fakedns_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *FakeDnsPool) GetIpPool() string {
+	if x != nil {
+		return x.IpPool
+	}
+	return ""
+}
+
+func (x *FakeDnsPool) GetLruSize() int64 {
+	if x != nil {
+		return x.LruSize
+	}
+	return 0
+}
+
+var File_app_dns_fakedns_fakedns_proto protoreflect.FileDescriptor
+
+var file_app_dns_fakedns_fakedns_proto_rawDesc = []byte{
+	0x0a, 0x1d, 0x61, 0x70, 0x70, 0x2f, 0x64, 0x6e, 0x73, 0x2f, 0x66, 0x61, 0x6b, 0x65, 0x64, 0x6e,
+	0x73, 0x2f, 0x66, 0x61, 0x6b, 0x65, 0x64, 0x6e, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12,
+	0x1a, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e, 0x61, 0x70, 0x70, 0x2e,
+	0x64, 0x6e, 0x73, 0x2e, 0x66, 0x61, 0x6b, 0x65, 0x64, 0x6e, 0x73, 0x22, 0x40, 0x0a, 0x0b, 0x46,
+	0x61, 0x6b, 0x65, 0x44, 0x6e, 0x73, 0x50, 0x6f, 0x6f, 0x6c, 0x12, 0x17, 0x0a, 0x07, 0x69, 0x70,
+	0x5f, 0x70, 0x6f, 0x6f, 0x6c, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x06, 0x69, 0x70, 0x50,
+	0x6f, 0x6f, 0x6c, 0x12, 0x18, 0x0a, 0x07, 0x6c, 0x72, 0x75, 0x53, 0x69, 0x7a, 0x65, 0x18, 0x02,
+	0x20, 0x01, 0x28, 0x03, 0x52, 0x07, 0x6c, 0x72, 0x75, 0x53, 0x69, 0x7a, 0x65, 0x42, 0x5f, 0x0a,
+	0x1e, 0x63, 0x6f, 0x6d, 0x2e, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e,
+	0x61, 0x70, 0x70, 0x2e, 0x64, 0x6e, 0x73, 0x2e, 0x66, 0x61, 0x6b, 0x65, 0x64, 0x6e, 0x73, 0x50,
+	0x01, 0x5a, 0x1e, 0x76, 0x32, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x63, 0x6f, 0x72,
+	0x65, 0x2f, 0x61, 0x70, 0x70, 0x2f, 0x64, 0x6e, 0x73, 0x2f, 0x66, 0x61, 0x6b, 0x65, 0x64, 0x6e,
+	0x73, 0xaa, 0x02, 0x1a, 0x56, 0x32, 0x52, 0x61, 0x79, 0x2e, 0x43, 0x6f, 0x72, 0x65, 0x2e, 0x41,
+	0x70, 0x70, 0x2e, 0x44, 0x6e, 0x73, 0x2e, 0x46, 0x61, 0x6b, 0x65, 0x64, 0x6e, 0x73, 0x62, 0x06,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_app_dns_fakedns_fakedns_proto_rawDescOnce sync.Once
+	file_app_dns_fakedns_fakedns_proto_rawDescData = file_app_dns_fakedns_fakedns_proto_rawDesc
+)
+
+func file_app_dns_fakedns_fakedns_proto_rawDescGZIP() []byte {
+	file_app_dns_fakedns_fakedns_proto_rawDescOnce.Do(func() {
+		file_app_dns_fakedns_fakedns_proto_rawDescData = protoimpl.X.CompressGZIP(file_app_dns_fakedns_fakedns_proto_rawDescData)
+	})
+	return file_app_dns_fakedns_fakedns_proto_rawDescData
+}
+
+var file_app_dns_fakedns_fakedns_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_app_dns_fakedns_fakedns_proto_goTypes = []interface{}{
+	(*FakeDnsPool)(nil), // 0: xray.app.dns.fakedns.FakeDnsPool
+}
+var file_app_dns_fakedns_fakedns_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
+}
+
+func init() { file_app_dns_fakedns_fakedns_proto_init() }
+func file_app_dns_fakedns_fakedns_proto_init() {
+	if File_app_dns_fakedns_fakedns_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_app_dns_fakedns_fakedns_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*FakeDnsPool); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_app_dns_fakedns_fakedns_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_app_dns_fakedns_fakedns_proto_goTypes,
+		DependencyIndexes: file_app_dns_fakedns_fakedns_proto_depIdxs,
+		MessageInfos:      file_app_dns_fakedns_fakedns_proto_msgTypes,
+	}.Build()
+	File_app_dns_fakedns_fakedns_proto = out.File
+	file_app_dns_fakedns_fakedns_proto_rawDesc = nil
+	file_app_dns_fakedns_fakedns_proto_goTypes = nil
+	file_app_dns_fakedns_fakedns_proto_depIdxs = nil
+}

app/dns/fakedns/fakedns.proto

@@ -0,0 +1,12 @@
+syntax = "proto3";
+
+package xray.app.dns.fakedns;
+option csharp_namespace = "Xray.App.Dns.Fakedns";
+option go_package = "github.com/xtls/xray-core/app/dns/fakedns";
+option java_package = "com.xray.app.dns.fakedns";
+option java_multiple_files = true;
+
+message FakeDnsPool{
+  string ip_pool = 1; //CIDR of IP pool used as fake DNS IP
+  int64  lruSize = 2; //Size of Pool for remembering relationship between domain name and IP address
+}

app/dns/fakedns/fakedns_test.go

@@ -0,0 +1,105 @@
+package fakedns
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/uuid"
+	"github.com/xtls/xray-core/features/dns"
+)
+
+var (
+	ipPrefix = "198.18."
+)
+
+func TestNewFakeDnsHolder(_ *testing.T) {
+	_, err := NewFakeDNSHolder()
+	common.Must(err)
+}
+
+func TestFakeDnsHolderCreateMapping(t *testing.T) {
+	fkdns, err := NewFakeDNSHolder()
+	common.Must(err)
+
+	addr := fkdns.GetFakeIPForDomain("fakednstest.example.com")
+	assert.Equal(t, ipPrefix, addr[0].IP().String()[0:len(ipPrefix)])
+}
+
+func TestFakeDnsHolderCreateMappingMany(t *testing.T) {
+	fkdns, err := NewFakeDNSHolder()
+	common.Must(err)
+
+	addr := fkdns.GetFakeIPForDomain("fakednstest.example.com")
+	assert.Equal(t, ipPrefix, addr[0].IP().String()[0:len(ipPrefix)])
+
+	addr2 := fkdns.GetFakeIPForDomain("fakednstest2.example.com")
+	assert.Equal(t, ipPrefix, addr2[0].IP().String()[0:len(ipPrefix)])
+	assert.NotEqual(t, addr[0].IP().String(), addr2[0].IP().String())
+}
+
+func TestFakeDnsHolderCreateMappingManyAndResolve(t *testing.T) {
+	fkdns, err := NewFakeDNSHolder()
+	common.Must(err)
+
+	addr := fkdns.GetFakeIPForDomain("fakednstest.example.com")
+	addr2 := fkdns.GetFakeIPForDomain("fakednstest2.example.com")
+
+	{
+		result := fkdns.GetDomainFromFakeDNS(addr[0])
+		assert.Equal(t, "fakednstest.example.com", result)
+	}
+
+	{
+		result := fkdns.GetDomainFromFakeDNS(addr2[0])
+		assert.Equal(t, "fakednstest2.example.com", result)
+	}
+}
+
+func TestFakeDnsHolderCreateMappingManySingleDomain(t *testing.T) {
+	fkdns, err := NewFakeDNSHolder()
+	common.Must(err)
+
+	addr := fkdns.GetFakeIPForDomain("fakednstest.example.com")
+	addr2 := fkdns.GetFakeIPForDomain("fakednstest.example.com")
+	assert.Equal(t, addr[0].IP().String(), addr2[0].IP().String())
+}
+
+func TestFakeDnsHolderCreateMappingAndRollOver(t *testing.T) {
+	fkdns, err := NewFakeDNSHolderConfigOnly(&FakeDnsPool{
+		IpPool:  dns.FakeIPPool,
+		LruSize: 256,
+	})
+	common.Must(err)
+
+	err = fkdns.Start()
+
+	common.Must(err)
+
+	addr := fkdns.GetFakeIPForDomain("fakednstest.example.com")
+	addr2 := fkdns.GetFakeIPForDomain("fakednstest2.example.com")
+
+	for i := 0; i <= 8192; i++ {
+		{
+			result := fkdns.GetDomainFromFakeDNS(addr[0])
+			assert.Equal(t, "fakednstest.example.com", result)
+		}
+
+		{
+			result := fkdns.GetDomainFromFakeDNS(addr2[0])
+			assert.Equal(t, "fakednstest2.example.com", result)
+		}
+
+		{
+			uuid := uuid.New()
+			domain := uuid.String() + ".fakednstest.example.com"
+			tempAddr := fkdns.GetFakeIPForDomain(domain)
+			rsaddr := tempAddr[0].IP().String()
+
+			result := fkdns.GetDomainFromFakeDNS(net.ParseAddress(rsaddr))
+			assert.Equal(t, domain, result)
+		}
+	}
+}

app/dns/hosts.go

@@ -5,6 +5,7 @@ import (
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/strmatcher"
 	"github.com/xtls/xray-core/features"
+	"github.com/xtls/xray-core/features/dns"
 )
 
 // StaticHosts represents static domain-ip mapping in DNS server.
@@ -92,7 +93,7 @@ func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDoma
 	return sh, nil
 }
 
-func filterIP(ips []net.Address, option IPOption) []net.Address {
+func filterIP(ips []net.Address, option dns.IPOption) []net.Address {
 	filtered := make([]net.Address, 0, len(ips))
 	for _, ip := range ips {
 		if (ip.Family().IsIPv4() && option.IPv4Enable) || (ip.Family().IsIPv6() && option.IPv6Enable) {
@@ -106,7 +107,7 @@ func filterIP(ips []net.Address, option IPOption) []net.Address {
 }
 
 // LookupIP returns IP address for the given domain, if exists in this StaticHosts.
-func (h *StaticHosts) LookupIP(domain string, option IPOption) []net.Address {
+func (h *StaticHosts) LookupIP(domain string, option dns.IPOption) []net.Address {
 	indices := h.matchers.Match(domain)
 	if len(indices) == 0 {
 		return nil

app/dns/hosts_test.go

@@ -8,6 +8,7 @@ import (
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/features/dns"
 )
 
 func TestStaticHosts(t *testing.T) {
@@ -39,7 +40,7 @@ func TestStaticHosts(t *testing.T) {
 	common.Must(err)
 
 	{
-		ips := hosts.LookupIP("example.com", IPOption{
+		ips := hosts.LookupIP("example.com", dns.IPOption{
 			IPv4Enable: true,
 			IPv6Enable: true,
 		})
@@ -52,7 +53,7 @@ func TestStaticHosts(t *testing.T) {
 	}
 
 	{
-		ips := hosts.LookupIP("www.example.cn", IPOption{
+		ips := hosts.LookupIP("www.example.cn", dns.IPOption{
 			IPv4Enable: true,
 			IPv6Enable: true,
 		})
@@ -65,7 +66,7 @@ func TestStaticHosts(t *testing.T) {
 	}
 
 	{
-		ips := hosts.LookupIP("baidu.com", IPOption{
+		ips := hosts.LookupIP("baidu.com", dns.IPOption{
 			IPv4Enable: false,
 			IPv6Enable: true,
 		})

app/dns/nameserver.go

@@ -4,39 +4,26 @@ import (
 	"context"
 
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/dns/localdns"
 )
 
-// IPOption is an object for IP query options.
-type IPOption struct {
-	IPv4Enable bool
-	IPv6Enable bool
-}
-
 // Client is the interface for DNS client.
 type Client interface {
 	// Name of the Client.
 	Name() string
 
 	// QueryIP sends IP queries to its configured server.
-	QueryIP(ctx context.Context, domain string, option IPOption) ([]net.IP, error)
+	QueryIP(ctx context.Context, domain string, option dns.IPOption) ([]net.IP, error)
 }
 
 type LocalNameServer struct {
 	client *localdns.Client
 }
 
-func (s *LocalNameServer) QueryIP(ctx context.Context, domain string, option IPOption) ([]net.IP, error) {
-	if option.IPv4Enable && option.IPv6Enable {
-		return s.client.LookupIP(domain)
-	}
-
-	if option.IPv4Enable {
-		return s.client.LookupIPv4(domain)
-	}
-
-	if option.IPv6Enable {
-		return s.client.LookupIPv6(domain)
+func (s *LocalNameServer) QueryIP(_ context.Context, domain string, option dns.IPOption) ([]net.IP, error) {
+	if option.IPv4Enable || option.IPv6Enable {
+		return s.client.LookupIP(domain, option)
 	}
 
 	return nil, newError("neither IPv4 nor IPv6 is enabled")

app/dns/nameserver_fakedns.go

@@ -0,0 +1,41 @@
+package dns
+
+import (
+	"context"
+
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features/dns"
+)
+
+type FakeDNSServer struct {
+	fakeDNSEngine dns.FakeDNSEngine
+}
+
+func NewFakeDNSServer() *FakeDNSServer {
+	return &FakeDNSServer{}
+}
+
+func (FakeDNSServer) Name() string {
+	return "FakeDNS"
+}
+
+func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, _ dns.IPOption) ([]net.IP, error) {
+	if f.fakeDNSEngine == nil {
+		if err := core.RequireFeatures(ctx, func(fd dns.FakeDNSEngine) {
+			f.fakeDNSEngine = fd
+		}); err != nil {
+			return nil, newError("Unable to locate a fake DNS Engine").Base(err).AtError()
+		}
+	}
+	ips := f.fakeDNSEngine.GetFakeIPForDomain(domain)
+
+	netIP := toNetIP(ips)
+	if netIP == nil {
+		return nil, newError("Unable to convert IP to net ip").AtError()
+	}
+
+	newError(f.Name(), " got answer: ", domain, " -> ", ips).AtInfo().WriteToLog()
+
+	return netIP, nil
+}

app/dns/nameserver_test.go

@@ -7,14 +7,16 @@ import (
 
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/common"
+	dns_feature "github.com/xtls/xray-core/features/dns"
 )
 
 func TestLocalNameServer(t *testing.T) {
 	s := NewLocalNameServer()
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
-	ips, err := s.QueryIP(ctx, "google.com", IPOption{
+	ips, err := s.QueryIP(ctx, "google.com", dns_feature.IPOption{
 		IPv4Enable: true,
 		IPv6Enable: true,
+		FakeEnable: false,
 	})
 	cancel()
 	common.Must(err)

app/dns/server.go

@@ -22,6 +22,7 @@ import (
 	"github.com/xtls/xray-core/features"
 	"github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/routing"
+	"github.com/xtls/xray-core/transport/internet"
 )
 
 // Server is a DNS rely server.
@@ -29,7 +30,8 @@ type Server struct {
 	sync.Mutex
 	hosts         *StaticHosts
 	clientIP      net.IP
-	clients       []Client             // clientIdx -> Client
+	clients       []Client // clientIdx -> Client
+	ctx           context.Context
 	ipIndexMap    []*MultiGeoIPMatcher // clientIdx -> *MultiGeoIPMatcher
 	domainRules   [][]string           // clientIdx -> domainRuleIdx -> DomainRule
 	domainMatcher strmatcher.IndexMatcher
@@ -74,6 +76,7 @@ func generateRandomTag() string {
 func New(ctx context.Context, config *Config) (*Server, error) {
 	server := &Server{
 		clients: make([]Client, 0, len(config.NameServers)+len(config.NameServer)),
+		ctx:     ctx,
 		tag:     config.Tag,
 	}
 	if server.tag == "" {
@@ -143,6 +146,9 @@ func New(ctx context.Context, config *Config) (*Server, error) {
 				server.clients[idx] = c
 			}))
 
+		case address.Family().IsDomain() && address.Domain() == "fakedns":
+			server.clients = append(server.clients, NewFakeDNSServer())
+
 		default:
 			// UDP classic DNS mode
 			dest := endpoint.AsDestination()
@@ -294,13 +300,14 @@ func (s *Server) Match(idx int, client Client, domain string, ips []net.IP) ([]n
 	return newIps, nil
 }
 
-func (s *Server) queryIPTimeout(idx int, client Client, domain string, option IPOption) ([]net.IP, error) {
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second*4)
+func (s *Server) queryIPTimeout(idx int, client Client, domain string, option dns.IPOption) ([]net.IP, error) {
+	ctx, cancel := context.WithTimeout(s.ctx, time.Second*4)
 	if len(s.tag) > 0 {
 		ctx = session.ContextWithInbound(ctx, &session.Inbound{
 			Tag: s.tag,
 		})
 	}
+	ctx = internet.ContextWithLookupDomain(ctx, domain)
 	ips, err := client.QueryIP(ctx, domain, option)
 	cancel()
 
@@ -312,31 +319,7 @@ func (s *Server) queryIPTimeout(idx int, client Client, domain string, option IP
 	return ips, err
 }
 
-// LookupIP implements dns.Client.
-func (s *Server) LookupIP(domain string) ([]net.IP, error) {
-	return s.lookupIPInternal(domain, IPOption{
-		IPv4Enable: true,
-		IPv6Enable: true,
-	})
-}
-
-// LookupIPv4 implements dns.IPv4Lookup.
-func (s *Server) LookupIPv4(domain string) ([]net.IP, error) {
-	return s.lookupIPInternal(domain, IPOption{
-		IPv4Enable: true,
-		IPv6Enable: false,
-	})
-}
-
-// LookupIPv6 implements dns.IPv6Lookup.
-func (s *Server) LookupIPv6(domain string) ([]net.IP, error) {
-	return s.lookupIPInternal(domain, IPOption{
-		IPv4Enable: false,
-		IPv6Enable: true,
-	})
-}
-
-func (s *Server) lookupStatic(domain string, option IPOption, depth int32) []net.Address {
+func (s *Server) lookupStatic(domain string, option dns.IPOption, depth int32) []net.Address {
 	ips := s.hosts.LookupIP(domain, option)
 	if ips == nil {
 		return nil
@@ -360,14 +343,15 @@ func toNetIP(ips []net.Address) []net.IP {
 	return netips
 }
 
-func (s *Server) lookupIPInternal(domain string, option IPOption) ([]net.IP, error) {
+// LookupIP implements dns.Client.
+func (s *Server) LookupIP(domain string, option dns.IPOption) ([]net.IP, error) {
 	if domain == "" {
 		return nil, newError("empty domain name")
 	}
 	domain = strings.ToLower(domain)
 
 	// normalize the FQDN form query
-	if domain[len(domain)-1] == '.' {
+	if strings.HasSuffix(domain, ".") {
 		domain = domain[:len(domain)-1]
 	}
 
@@ -404,6 +388,10 @@ func (s *Server) lookupIPInternal(domain string, option IPOption) ([]net.IP, err
 		for _, idx := range indices {
 			clientIdx := int(s.matcherInfos[idx].clientIdx)
 			matchedClient = s.clients[clientIdx]
+			if !option.FakeEnable && strings.EqualFold(matchedClient.Name(), "FakeDNS") {
+				newError("skip DNS resolution for domain ", domain, " at server ", matchedClient.Name()).AtDebug().WriteToLog()
+				continue
+			}
 			ips, err := s.queryIPTimeout(clientIdx, matchedClient, domain, option)
 			if len(ips) > 0 {
 				return ips, nil
@@ -423,7 +411,10 @@ func (s *Server) lookupIPInternal(domain string, option IPOption) ([]net.IP, err
 			newError("domain ", domain, " at server ", client.Name(), " idx:", idx, " already lookup failed, just ignore").AtDebug().WriteToLog()
 			continue
 		}
-
+		if !option.FakeEnable && strings.EqualFold(client.Name(), "FakeDNS") {
+			newError("skip DNS resolution for domain ", domain, " at server ", client.Name()).AtDebug().WriteToLog()
+			continue
+		}
 		ips, err := s.queryIPTimeout(idx, client, domain, option)
 		if len(ips) > 0 {
 			return ips, nil

app/dns/server_test.go

@@ -101,8 +101,8 @@ func (*staticHandler) ServeDNS(w dns.ResponseWriter, r *dns.Msg) {
 			rr, _ := dns.NewRR("localhost-b. IN A 127.0.0.4")
 			ans.Answer = append(ans.Answer, rr)
 
-		case q.Name == "Mijia\\ Cloud." && q.Qtype == dns.TypeA:
-			rr, _ := dns.NewRR("Mijia\\ Cloud. IN A 127.0.0.1")
+		case q.Name == "mijia\\ cloud." && q.Qtype == dns.TypeA:
+			rr, _ := dns.NewRR("mijia\\ cloud. IN A 127.0.0.1")
 			ans.Answer = append(ans.Answer, rr)
 		}
 	}
@@ -154,7 +154,11 @@ func TestUDPServerSubnet(t *testing.T) {
 
 	client := v.GetFeature(feature_dns.ClientType()).(feature_dns.Client)
 
-	ips, err := client.LookupIP("google.com")
+	ips, err := client.LookupIP("google.com", feature_dns.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+		FakeEnable: false,
+	})
 	if err != nil {
 		t.Fatal("unexpected error: ", err)
 	}
@@ -209,7 +213,11 @@ func TestUDPServer(t *testing.T) {
 	client := v.GetFeature(feature_dns.ClientType()).(feature_dns.Client)
 
 	{
-		ips, err := client.LookupIP("google.com")
+		ips, err := client.LookupIP("google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -220,7 +228,11 @@ func TestUDPServer(t *testing.T) {
 	}
 
 	{
-		ips, err := client.LookupIP("facebook.com")
+		ips, err := client.LookupIP("facebook.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -231,7 +243,11 @@ func TestUDPServer(t *testing.T) {
 	}
 
 	{
-		_, err := client.LookupIP("notexist.google.com")
+		_, err := client.LookupIP("notexist.google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err == nil {
 			t.Fatal("nil error")
 		}
@@ -241,8 +257,11 @@ func TestUDPServer(t *testing.T) {
 	}
 
 	{
-		clientv6 := client.(feature_dns.IPv6Lookup)
-		ips, err := clientv6.LookupIPv6("ipv4only.google.com")
+		ips, err := client.LookupIP("ipv4only.google.com", feature_dns.IPOption{
+			IPv4Enable: false,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != feature_dns.ErrEmptyResponse {
 			t.Fatal("error: ", err)
 		}
@@ -254,7 +273,11 @@ func TestUDPServer(t *testing.T) {
 	dnsServer.Shutdown()
 
 	{
-		ips, err := client.LookupIP("google.com")
+		ips, err := client.LookupIP("google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -331,7 +354,11 @@ func TestPrioritizedDomain(t *testing.T) {
 	startTime := time.Now()
 
 	{
-		ips, err := client.LookupIP("google.com")
+		ips, err := client.LookupIP("google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -390,10 +417,12 @@ func TestUDPServerIPv6(t *testing.T) {
 	common.Must(err)
 
 	client := v.GetFeature(feature_dns.ClientType()).(feature_dns.Client)
-	client6 := client.(feature_dns.IPv6Lookup)
-
 	{
-		ips, err := client6.LookupIPv6("ipv6.google.com")
+		ips, err := client.LookupIP("ipv6.google.com", feature_dns.IPOption{
+			IPv4Enable: false,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -456,7 +485,11 @@ func TestStaticHostDomain(t *testing.T) {
 	client := v.GetFeature(feature_dns.ClientType()).(feature_dns.Client)
 
 	{
-		ips, err := client.LookupIP("example.com")
+		ips, err := client.LookupIP("example.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -563,7 +596,11 @@ func TestIPMatch(t *testing.T) {
 	startTime := time.Now()
 
 	{
-		ips, err := client.LookupIP("google.com")
+		ips, err := client.LookupIP("google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -682,7 +719,11 @@ func TestLocalDomain(t *testing.T) {
 	startTime := time.Now()
 
 	{ // Will match dotless:
-		ips, err := client.LookupIP("hostname")
+		ips, err := client.LookupIP("hostname", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -693,7 +734,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match domain:local
-		ips, err := client.LookupIP("hostname.local")
+		ips, err := client.LookupIP("hostname.local", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -704,7 +749,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match static ip
-		ips, err := client.LookupIP("hostnamestatic")
+		ips, err := client.LookupIP("hostnamestatic", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -715,7 +764,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match domain replacing
-		ips, err := client.LookupIP("hostnamealias")
+		ips, err := client.LookupIP("hostnamealias", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -726,7 +779,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match dotless:localhost, but not expectIPs: 127.0.0.2, 127.0.0.3, then matches at dotless:
-		ips, err := client.LookupIP("localhost")
+		ips, err := client.LookupIP("localhost", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -737,7 +794,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match dotless:localhost, and expectIPs: 127.0.0.2, 127.0.0.3
-		ips, err := client.LookupIP("localhost-a")
+		ips, err := client.LookupIP("localhost-a", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -748,7 +809,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match dotless:localhost, and expectIPs: 127.0.0.2, 127.0.0.3
-		ips, err := client.LookupIP("localhost-b")
+		ips, err := client.LookupIP("localhost-b", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -759,7 +824,11 @@ func TestLocalDomain(t *testing.T) {
 	}
 
 	{ // Will match dotless:
-		ips, err := client.LookupIP("Mijia Cloud")
+		ips, err := client.LookupIP("Mijia Cloud", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -921,7 +990,11 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
 	startTime := time.Now()
 
 	{ // Will match server 1,2 and server 1 returns expected ip
-		ips, err := client.LookupIP("google.com")
+		ips, err := client.LookupIP("google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -932,8 +1005,11 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
 	}
 
 	{ // Will match server 1,2 and server 1 returns unexpected ip, then server 2 returns expected one
-		clientv4 := client.(feature_dns.IPv4Lookup)
-		ips, err := clientv4.LookupIPv4("ipv6.google.com")
+		ips, err := client.LookupIP("ipv6.google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: false,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -944,7 +1020,11 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
 	}
 
 	{ // Will match server 3,1,2 and server 3 returns expected one
-		ips, err := client.LookupIP("api.google.com")
+		ips, err := client.LookupIP("api.google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}
@@ -955,7 +1035,11 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
 	}
 
 	{ // Will match server 4,3,1,2 and server 4 returns expected one
-		ips, err := client.LookupIP("v2.api.google.com")
+		ips, err := client.LookupIP("v2.api.google.com", feature_dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err != nil {
 			t.Fatal("unexpected error: ", err)
 		}

app/dns/udpns.go

@@ -2,12 +2,14 @@ package dns
 
 import (
 	"context"
+	"github.com/xtls/xray-core/transport/internet"
 	"strings"
 	"sync"
 	"sync/atomic"
 	"time"
 
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/protocol/dns"
 	udp_proto "github.com/xtls/xray-core/common/protocol/udp"
@@ -52,7 +54,7 @@ func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher
 		Execute:  s.Cleanup,
 	}
 	s.udpServer = udp.NewDispatcher(dispatcher, s.HandleResponse)
-	newError("DNS: created udp client inited for ", address.NetAddr()).AtInfo().WriteToLog()
+	newError("DNS: created UDP client initialized for ", address.NetAddr()).AtInfo().WriteToLog()
 	return s
 }
 
@@ -178,7 +180,7 @@ func (s *ClassicNameServer) addPendingRequest(req *dnsRequest) {
 	s.requests[id] = *req
 }
 
-func (s *ClassicNameServer) sendQuery(ctx context.Context, domain string, option IPOption) {
+func (s *ClassicNameServer) sendQuery(ctx context.Context, domain string, option dns_feature.IPOption) {
 	newError(s.name, " querying DNS for: ", domain).AtDebug().WriteToLog(session.ExportIDToError(ctx))
 
 	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(s.clientIP))
@@ -190,14 +192,21 @@ func (s *ClassicNameServer) sendQuery(ctx context.Context, domain string, option
 		if inbound := session.InboundFromContext(ctx); inbound != nil {
 			udpCtx = session.ContextWithInbound(udpCtx, inbound)
 		}
+		udpCtx = internet.ContextWithLookupDomain(udpCtx, internet.LookupDomainFromContext(ctx))
 		udpCtx = session.ContextWithContent(udpCtx, &session.Content{
 			Protocol: "dns",
 		})
+		udpCtx = log.ContextWithAccessMessage(udpCtx, &log.AccessMessage{
+			From:   "DNS",
+			To:     s.address,
+			Status: log.AccessAccepted,
+			Reason: "",
+		})
 		s.udpServer.Dispatch(udpCtx, s.address, b)
 	}
 }
 
-func (s *ClassicNameServer) findIPsForDomain(domain string, option IPOption) ([]net.IP, error) {
+func (s *ClassicNameServer) findIPsForDomain(domain string, option dns_feature.IPOption) ([]net.IP, error) {
 	s.RLock()
 	record, found := s.ips[domain]
 	s.RUnlock()
@@ -235,12 +244,14 @@ func (s *ClassicNameServer) findIPsForDomain(domain string, option IPOption) ([]
 	return nil, dns_feature.ErrEmptyResponse
 }
 
-func (s *ClassicNameServer) QueryIP(ctx context.Context, domain string, option IPOption) ([]net.IP, error) {
+// QueryIP implements Server.
+func (s *ClassicNameServer) QueryIP(ctx context.Context, domain string, option dns_feature.IPOption) ([]net.IP, error) {
 	fqdn := Fqdn(domain)
 
 	ips, err := s.findIPsForDomain(fqdn, option)
 	if err != errRecordNotFound {
 		newError(s.name, " cache HIT ", domain, " -> ", ips).Base(err).AtDebug().WriteToLog()
+		log.Record(&log.DNSLog{s.name, domain, ips, log.DNSCacheHit, 0, err})
 		return ips, err
 	}
 
@@ -271,10 +282,12 @@ func (s *ClassicNameServer) QueryIP(ctx context.Context, domain string, option I
 		close(done)
 	}()
 	s.sendQuery(ctx, fqdn, option)
+	start := time.Now()
 
 	for {
 		ips, err := s.findIPsForDomain(fqdn, option)
 		if err != errRecordNotFound {
+			log.Record(&log.DNSLog{s.name, domain, ips, log.DNSQueried, time.Since(start), err})
 			return ips, err
 		}
 

app/log/config.pb.go

@@ -88,6 +88,7 @@ type Config struct {
 	ErrorLogPath  string       `protobuf:"bytes,3,opt,name=error_log_path,json=errorLogPath,proto3" json:"error_log_path,omitempty"`
 	AccessLogType LogType      `protobuf:"varint,4,opt,name=access_log_type,json=accessLogType,proto3,enum=xray.app.log.LogType" json:"access_log_type,omitempty"`
 	AccessLogPath string       `protobuf:"bytes,5,opt,name=access_log_path,json=accessLogPath,proto3" json:"access_log_path,omitempty"`
+	EnableDnsLog  bool         `protobuf:"varint,6,opt,name=enable_dns_log,json=enableDnsLog,proto3" json:"enable_dns_log,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -157,13 +158,20 @@ func (x *Config) GetAccessLogPath() string {
 	return ""
 }
 
+func (x *Config) GetEnableDnsLog() bool {
+	if x != nil {
+		return x.EnableDnsLog
+	}
+	return false
+}
+
 var File_app_log_config_proto protoreflect.FileDescriptor
 
 var file_app_log_config_proto_rawDesc = []byte{
 	0x0a, 0x14, 0x61, 0x70, 0x70, 0x2f, 0x6c, 0x6f, 0x67, 0x2f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67,
 	0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x0c, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70,
 	0x2e, 0x6c, 0x6f, 0x67, 0x1a, 0x14, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2f, 0x6c, 0x6f, 0x67,
-	0x2f, 0x6c, 0x6f, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0x95, 0x02, 0x0a, 0x06, 0x43,
+	0x2f, 0x6c, 0x6f, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xbb, 0x02, 0x0a, 0x06, 0x43,
 	0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x3b, 0x0a, 0x0e, 0x65, 0x72, 0x72, 0x6f, 0x72, 0x5f, 0x6c,
 	0x6f, 0x67, 0x5f, 0x74, 0x79, 0x70, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0e, 0x32, 0x15, 0x2e,
 	0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x6c, 0x6f, 0x67, 0x2e, 0x4c, 0x6f, 0x67,
@@ -181,15 +189,17 @@ var file_app_log_config_proto_rawDesc = []byte{
 	0x65, 0x73, 0x73, 0x4c, 0x6f, 0x67, 0x54, 0x79, 0x70, 0x65, 0x12, 0x26, 0x0a, 0x0f, 0x61, 0x63,
 	0x63, 0x65, 0x73, 0x73, 0x5f, 0x6c, 0x6f, 0x67, 0x5f, 0x70, 0x61, 0x74, 0x68, 0x18, 0x05, 0x20,
 	0x01, 0x28, 0x09, 0x52, 0x0d, 0x61, 0x63, 0x63, 0x65, 0x73, 0x73, 0x4c, 0x6f, 0x67, 0x50, 0x61,
-	0x74, 0x68, 0x2a, 0x35, 0x0a, 0x07, 0x4c, 0x6f, 0x67, 0x54, 0x79, 0x70, 0x65, 0x12, 0x08, 0x0a,
-	0x04, 0x4e, 0x6f, 0x6e, 0x65, 0x10, 0x00, 0x12, 0x0b, 0x0a, 0x07, 0x43, 0x6f, 0x6e, 0x73, 0x6f,
-	0x6c, 0x65, 0x10, 0x01, 0x12, 0x08, 0x0a, 0x04, 0x46, 0x69, 0x6c, 0x65, 0x10, 0x02, 0x12, 0x09,
-	0x0a, 0x05, 0x45, 0x76, 0x65, 0x6e, 0x74, 0x10, 0x03, 0x42, 0x46, 0x0a, 0x10, 0x63, 0x6f, 0x6d,
-	0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x6c, 0x6f, 0x67, 0x50, 0x01, 0x5a,
-	0x21, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73,
-	0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x61, 0x70, 0x70, 0x2f, 0x6c,
-	0x6f, 0x67, 0xaa, 0x02, 0x0c, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x41, 0x70, 0x70, 0x2e, 0x4c, 0x6f,
-	0x67, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x74, 0x68, 0x12, 0x24, 0x0a, 0x0e, 0x65, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x5f, 0x64, 0x6e, 0x73,
+	0x5f, 0x6c, 0x6f, 0x67, 0x18, 0x06, 0x20, 0x01, 0x28, 0x08, 0x52, 0x0c, 0x65, 0x6e, 0x61, 0x62,
+	0x6c, 0x65, 0x44, 0x6e, 0x73, 0x4c, 0x6f, 0x67, 0x2a, 0x35, 0x0a, 0x07, 0x4c, 0x6f, 0x67, 0x54,
+	0x79, 0x70, 0x65, 0x12, 0x08, 0x0a, 0x04, 0x4e, 0x6f, 0x6e, 0x65, 0x10, 0x00, 0x12, 0x0b, 0x0a,
+	0x07, 0x43, 0x6f, 0x6e, 0x73, 0x6f, 0x6c, 0x65, 0x10, 0x01, 0x12, 0x08, 0x0a, 0x04, 0x46, 0x69,
+	0x6c, 0x65, 0x10, 0x02, 0x12, 0x09, 0x0a, 0x05, 0x45, 0x76, 0x65, 0x6e, 0x74, 0x10, 0x03, 0x42,
+	0x46, 0x0a, 0x10, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e,
+	0x6c, 0x6f, 0x67, 0x50, 0x01, 0x5a, 0x21, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f,
+	0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65,
+	0x2f, 0x61, 0x70, 0x70, 0x2f, 0x6c, 0x6f, 0x67, 0xaa, 0x02, 0x0c, 0x58, 0x72, 0x61, 0x79, 0x2e,
+	0x41, 0x70, 0x70, 0x2e, 0x4c, 0x6f, 0x67, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

app/log/config.proto

@@ -22,4 +22,5 @@ message Config {
 
   LogType access_log_type = 4;
   string access_log_path = 5;
+  bool enable_dns_log = 6;
 }

app/log/log.go

@@ -17,6 +17,7 @@ type Instance struct {
 	accessLogger log.Handler
 	errorLogger  log.Handler
 	active       bool
+	dns          bool
 }
 
 // New creates a new log.Instance based on the given config.
@@ -24,6 +25,7 @@ func New(ctx context.Context, config *Config) (*Instance, error) {
 	g := &Instance{
 		config: config,
 		active: false,
+		dns:    config.EnableDnsLog,
 	}
 	log.RegisterHandler(g)
 
@@ -103,6 +105,10 @@ func (g *Instance) Handle(msg log.Message) {
 		if g.accessLogger != nil {
 			g.accessLogger.Handle(msg)
 		}
+	case *log.DNSLog:
+		if g.dns && g.accessLogger != nil {
+			g.accessLogger.Handle(msg)
+		}
 	case *log.GeneralMessage:
 		if g.errorLogger != nil && msg.Severity <= g.config.ErrorLogLevel {
 			g.errorLogger.Handle(msg)

app/proxyman/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.14.0
+// 	protoc        (unknown)
 // source: app/proxyman/config.proto
 
 package proxyman
@@ -239,9 +239,12 @@ type SniffingConfig struct {
 	// Whether or not to enable content sniffing on an inbound connection.
 	Enabled bool `protobuf:"varint,1,opt,name=enabled,proto3" json:"enabled,omitempty"`
 	// Override target destination if sniff'ed protocol is in the given list.
-	// Supported values are "http", "tls".
+	// Supported values are "http", "tls", "fakedns".
 	DestinationOverride []string `protobuf:"bytes,2,rep,name=destination_override,json=destinationOverride,proto3" json:"destination_override,omitempty"`
 	DomainsExcluded     []string `protobuf:"bytes,3,rep,name=domains_excluded,json=domainsExcluded,proto3" json:"domains_excluded,omitempty"`
+	// Whether should only try to sniff metadata without waiting for client input.
+	// Can be used to support SMTP like protocol where server send the first message.
+	MetadataOnly bool `protobuf:"varint,4,opt,name=metadata_only,json=metadataOnly,proto3" json:"metadata_only,omitempty"`
 }
 
 func (x *SniffingConfig) Reset() {
@@ -297,6 +300,13 @@ func (x *SniffingConfig) GetDomainsExcluded() []string {
 	return nil
 }
 
+func (x *SniffingConfig) GetMetadataOnly() bool {
+	if x != nil {
+		return x.MetadataOnly
+	}
+	return false
+}
+
 type ReceiverConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -764,7 +774,7 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
 	0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x22, 0x2c, 0x0a, 0x04, 0x54, 0x79, 0x70, 0x65, 0x12,
 	0x0a, 0x0a, 0x06, 0x41, 0x6c, 0x77, 0x61, 0x79, 0x73, 0x10, 0x00, 0x12, 0x0a, 0x0a, 0x06, 0x52,
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-	0x6e, 0x61, 0x6c, 0x10, 0x02, 0x22, 0x88, 0x01, 0x0a, 0x0e, 0x53, 0x6e, 0x69, 0x66, 0x66, 0x69,
+	0x6e, 0x61, 0x6c, 0x10, 0x02, 0x22, 0xad, 0x01, 0x0a, 0x0e, 0x53, 0x6e, 0x69, 0x66, 0x66, 0x69,
 	0x6e, 0x67, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x18, 0x0a, 0x07, 0x65, 0x6e, 0x61, 0x62,
 	0x6c, 0x65, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x08, 0x52, 0x07, 0x65, 0x6e, 0x61, 0x62, 0x6c,
 	0x65, 0x64, 0x12, 0x31, 0x0a, 0x14, 0x64, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x61, 0x74, 0x69, 0x6f,
@@ -773,86 +783,88 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
 	0x72, 0x72, 0x69, 0x64, 0x65, 0x12, 0x29, 0x0a, 0x10, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x73,
 	0x5f, 0x65, 0x78, 0x63, 0x6c, 0x75, 0x64, 0x65, 0x64, 0x18, 0x03, 0x20, 0x03, 0x28, 0x09, 0x52,
 	0x0f, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x73, 0x45, 0x78, 0x63, 0x6c, 0x75, 0x64, 0x65, 0x64,
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-	0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1a, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63,
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-	0x32, 0x24, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x74, 0x72, 0x61, 0x6e, 0x73, 0x70, 0x6f, 0x72,
-	0x74, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e, 0x50, 0x72, 0x6f, 0x78, 0x79,
-	0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x0d, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x53, 0x65, 0x74,
-	0x74, 0x69, 0x6e, 0x67, 0x73, 0x12, 0x54, 0x0a, 0x12, 0x6d, 0x75, 0x6c, 0x74, 0x69, 0x70, 0x6c,
-	0x65, 0x78, 0x5f, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x18, 0x04, 0x20, 0x01, 0x28,
-	0x0b, 0x32, 0x25, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x70, 0x72, 0x6f,
-	0x78, 0x79, 0x6d, 0x61, 0x6e, 0x2e, 0x4d, 0x75, 0x6c, 0x74, 0x69, 0x70, 0x6c, 0x65, 0x78, 0x69,
-	0x6e, 0x67, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x11, 0x6d, 0x75, 0x6c, 0x74, 0x69, 0x70,
-	0x6c, 0x65, 0x78, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x22, 0x50, 0x0a, 0x12, 0x4d,
-	0x75, 0x6c, 0x74, 0x69, 0x70, 0x6c, 0x65, 0x78, 0x69, 0x6e, 0x67, 0x43, 0x6f, 0x6e, 0x66, 0x69,
-	0x67, 0x12, 0x18, 0x0a, 0x07, 0x65, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64, 0x18, 0x01, 0x20, 0x01,
-	0x28, 0x08, 0x52, 0x07, 0x65, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64, 0x12, 0x20, 0x0a, 0x0b, 0x63,
-	0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x63, 0x79, 0x18, 0x02, 0x20, 0x01, 0x28, 0x0d,
-	0x52, 0x0b, 0x63, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x63, 0x79, 0x2a, 0x23, 0x0a,
-	0x0e, 0x4b, 0x6e, 0x6f, 0x77, 0x6e, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x73, 0x12,
-	0x08, 0x0a, 0x04, 0x48, 0x54, 0x54, 0x50, 0x10, 0x00, 0x12, 0x07, 0x0a, 0x03, 0x54, 0x4c, 0x53,
-	0x10, 0x01, 0x42, 0x55, 0x0a, 0x15, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61,
-	0x70, 0x70, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e, 0x50, 0x01, 0x5a, 0x26, 0x67,
-	0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78,
-	0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x61, 0x70, 0x70, 0x2f, 0x70, 0x72, 0x6f,
-	0x78, 0x79, 0x6d, 0x61, 0x6e, 0xaa, 0x02, 0x11, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x41, 0x70, 0x70,
-	0x2e, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f,
-	0x33,
+	0x03, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x24, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x74, 0x72, 0x61,
+	0x6e, 0x73, 0x70, 0x6f, 0x72, 0x74, 0x2e, 0x69, 0x6e, 0x74, 0x65, 0x72, 0x6e, 0x65, 0x74, 0x2e,
+	0x50, 0x72, 0x6f, 0x78, 0x79, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x0d, 0x70, 0x72, 0x6f,
+	0x78, 0x79, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x12, 0x54, 0x0a, 0x12, 0x6d, 0x75,
+	0x6c, 0x74, 0x69, 0x70, 0x6c, 0x65, 0x78, 0x5f, 0x73, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73,
+	0x18, 0x04, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x25, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70,
+	0x70, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e, 0x2e, 0x4d, 0x75, 0x6c, 0x74, 0x69,
+	0x70, 0x6c, 0x65, 0x78, 0x69, 0x6e, 0x67, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x11, 0x6d,
+	0x75, 0x6c, 0x74, 0x69, 0x70, 0x6c, 0x65, 0x78, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73,
+	0x22, 0x50, 0x0a, 0x12, 0x4d, 0x75, 0x6c, 0x74, 0x69, 0x70, 0x6c, 0x65, 0x78, 0x69, 0x6e, 0x67,
+	0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x18, 0x0a, 0x07, 0x65, 0x6e, 0x61, 0x62, 0x6c, 0x65,
+	0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x08, 0x52, 0x07, 0x65, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64,
+	0x12, 0x20, 0x0a, 0x0b, 0x63, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x63, 0x79, 0x18,
+	0x02, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x0b, 0x63, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e,
+	0x63, 0x79, 0x2a, 0x23, 0x0a, 0x0e, 0x4b, 0x6e, 0x6f, 0x77, 0x6e, 0x50, 0x72, 0x6f, 0x74, 0x6f,
+	0x63, 0x6f, 0x6c, 0x73, 0x12, 0x08, 0x0a, 0x04, 0x48, 0x54, 0x54, 0x50, 0x10, 0x00, 0x12, 0x07,
+	0x0a, 0x03, 0x54, 0x4c, 0x53, 0x10, 0x01, 0x42, 0x55, 0x0a, 0x15, 0x63, 0x6f, 0x6d, 0x2e, 0x78,
+	0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e,
+	0x50, 0x01, 0x5a, 0x26, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78,
+	0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x61, 0x70,
+	0x70, 0x2f, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e, 0xaa, 0x02, 0x11, 0x58, 0x72, 0x61,
+	0x79, 0x2e, 0x41, 0x70, 0x70, 0x2e, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e, 0x62, 0x06,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

app/proxyman/config.proto

@@ -54,9 +54,13 @@ message SniffingConfig {
   bool enabled = 1;
 
   // Override target destination if sniff'ed protocol is in the given list.
-  // Supported values are "http", "tls".
+  // Supported values are "http", "tls", "fakedns".
   repeated string destination_override = 2;
   repeated string domains_excluded = 3;
+  
+  // Whether should only try to sniff metadata without waiting for client input.
+  // Can be used to support SMTP like protocol where server send the first message.
+  bool metadata_only = 4;
 }
 
 message ReceiverConfig {

app/proxyman/inbound/always.go

@@ -133,6 +133,7 @@ func NewAlwaysOnInboundHandler(ctx context.Context, tag string, receiverConfig *
 					address:         address,
 					port:            net.Port(port),
 					dispatcher:      h.mux,
+					sniffingConfig:  receiverConfig.GetEffectiveSniffingSettings(),
 					uplinkCounter:   uplinkCounter,
 					downlinkCounter: downlinkCounter,
 					stream:          mss,

app/proxyman/inbound/dynamic.go

@@ -153,6 +153,7 @@ func (h *DynamicInboundHandler) refresh() error {
 				address:         address,
 				port:            port,
 				dispatcher:      h.mux,
+				sniffingConfig:  h.receiverConfig.GetEffectiveSniffingSettings(),
 				uplinkCounter:   uplinkCounter,
 				downlinkCounter: downlinkCounter,
 				stream:          h.streamSettings,

app/proxyman/inbound/inbound.go

@@ -42,6 +42,9 @@ func (m *Manager) AddHandler(ctx context.Context, handler inbound.Handler) error
 
 	tag := handler.Tag()
 	if len(tag) > 0 {
+		if _, found := m.taggedHandlers[tag]; found {
+			return newError("existing tag found: " + tag)
+		}
 		m.taggedHandlers[tag] = handler
 	} else {
 		m.untaggedHandler = append(m.untaggedHandler, handler)

app/proxyman/inbound/worker.go

@@ -98,6 +98,7 @@ func (w *tcpWorker) callback(conn internet.Connection) {
 		content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
 		content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
 		content.SniffingRequest.ExcludeForDomain = w.sniffingConfig.DomainsExcluded
+		content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
 	}
 	ctx = session.ContextWithContent(ctx, content)
 
@@ -235,6 +236,7 @@ type udpWorker struct {
 	tag             string
 	stream          *internet.MemoryStreamConfig
 	dispatcher      routing.Dispatcher
+	sniffingConfig  *proxyman.SniffingConfig
 	uplinkCounter   stats.Counter
 	downlinkCounter stats.Counter
 
@@ -297,7 +299,7 @@ func (w *udpWorker) callback(b *buf.Buffer, source net.Destination, originalDest
 		common.Must(w.checker.Start())
 
 		go func() {
-			ctx := context.Background()
+			ctx := w.ctx
 			sid := session.NewID()
 			ctx = session.ContextWithID(ctx, sid)
 
@@ -311,6 +313,13 @@ func (w *udpWorker) callback(b *buf.Buffer, source net.Destination, originalDest
 				Gateway: net.UDPDestination(w.address, w.port),
 				Tag:     w.tag,
 			})
+			content := new(session.Content)
+			if w.sniffingConfig != nil {
+				content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
+				content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
+				content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
+			}
+			ctx = session.ContextWithContent(ctx, content)
 			if err := w.proxy.Process(ctx, net.Network_UDP, conn, w.dispatcher); err != nil {
 				newError("connection ends").Base(err).WriteToLog(session.ExportIDToError(ctx))
 			}
@@ -451,6 +460,7 @@ func (w *dsWorker) callback(conn internet.Connection) {
 		content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
 		content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
 		content.SniffingRequest.ExcludeForDomain = w.sniffingConfig.DomainsExcluded
+		content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
 	}
 	ctx = session.ContextWithContent(ctx, content)
 

app/proxyman/outbound/outbound.go

@@ -109,6 +109,9 @@ func (m *Manager) AddHandler(ctx context.Context, handler outbound.Handler) erro
 
 	tag := handler.Tag()
 	if len(tag) > 0 {
+		if _, found := m.taggedHandler[tag]; found {
+			return newError("existing tag found: " + tag)
+		}
 		m.taggedHandler[tag] = handler
 	} else {
 		m.untaggedHandlers = append(m.untaggedHandlers, handler)

app/reverse/portal.go

@@ -157,6 +157,9 @@ func (p *StaticMuxPicker) PickAvailable() (*mux.ClientWorker, error) {
 		if w.draining {
 			continue
 		}
+		if w.client.Closed() {
+			continue
+		}
 		if w.client.ActiveConnections() < minConn {
 			minConn = w.client.ActiveConnections()
 			minIdx = i

app/router/condition_geoip_test.go

@@ -18,10 +18,10 @@ func init() {
 	common.Must(err)
 
 	if _, err := os.Stat(platform.GetAssetLocation("geoip.dat")); err != nil && os.IsNotExist(err) {
-		common.Must(filesystem.CopyFile(platform.GetAssetLocation("geoip.dat"), filepath.Join(wd, "..", "..", "release", "config", "geoip.dat")))
+		common.Must(filesystem.CopyFile(platform.GetAssetLocation("geoip.dat"), filepath.Join(wd, "..", "..", "resources", "geoip.dat")))
 	}
 	if _, err := os.Stat(platform.GetAssetLocation("geosite.dat")); err != nil && os.IsNotExist(err) {
-		common.Must(filesystem.CopyFile(platform.GetAssetLocation("geosite.dat"), filepath.Join(wd, "..", "..", "release", "config", "geosite.dat")))
+		common.Must(filesystem.CopyFile(platform.GetAssetLocation("geosite.dat"), filepath.Join(wd, "..", "..", "resources", "geosite.dat")))
 	}
 }
 

app/router/router_test.go

@@ -9,6 +9,7 @@ import (
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/outbound"
 	routing_session "github.com/xtls/xray-core/features/routing/session"
 	"github.com/xtls/xray-core/testing/mocks"
@@ -115,7 +116,11 @@ func TestIPOnDemand(t *testing.T) {
 	defer mockCtl.Finish()
 
 	mockDNS := mocks.NewDNSClient(mockCtl)
-	mockDNS.EXPECT().LookupIP(gomock.Eq("example.com")).Return([]net.IP{{192, 168, 0, 1}}, nil).AnyTimes()
+	mockDNS.EXPECT().LookupIP(gomock.Eq("example.com"), dns.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+		FakeEnable: false,
+	}).Return([]net.IP{{192, 168, 0, 1}}, nil).AnyTimes()
 
 	r := new(Router)
 	common.Must(r.Init(config, mockDNS, nil))
@@ -150,7 +155,11 @@ func TestIPIfNonMatchDomain(t *testing.T) {
 	defer mockCtl.Finish()
 
 	mockDNS := mocks.NewDNSClient(mockCtl)
-	mockDNS.EXPECT().LookupIP(gomock.Eq("example.com")).Return([]net.IP{{192, 168, 0, 1}}, nil).AnyTimes()
+	mockDNS.EXPECT().LookupIP(gomock.Eq("example.com"), dns.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+		FakeEnable: false,
+	}).Return([]net.IP{{192, 168, 0, 1}}, nil).AnyTimes()
 
 	r := new(Router)
 	common.Must(r.Init(config, mockDNS, nil))

common/buf/buffer.go

@@ -31,6 +31,22 @@ func New() *Buffer {
 	}
 }
 
+func NewExisted(b []byte) *Buffer {
+	if cap(b) < Size {
+		panic("Invalid buffer")
+	}
+
+	oLen := len(b)
+	if oLen < Size {
+		b = append(b, make([]byte, Size-oLen)...)
+	}
+
+	return &Buffer{
+		v:   b,
+		end: int32(oLen),
+	}
+}
+
 // StackNew creates a new Buffer object on stack.
 // This method is for buffers that is released in the same function.
 func StackNew() Buffer {
@@ -110,6 +126,9 @@ func (b *Buffer) BytesTo(to int32) []byte {
 	if to < 0 {
 		to += b.Len()
 	}
+	if to < 0 {
+		to = 0
+	}
 	return b.v[b.start : b.start+to]
 }
 

common/cache/lru.go

@@ -0,0 +1,85 @@
+package cache
+
+import (
+	"container/list"
+	sync "sync"
+)
+
+// Lru simple, fast lru cache implementation
+type Lru interface {
+	Get(key interface{}) (value interface{}, ok bool)
+	GetKeyFromValue(value interface{}) (key interface{}, ok bool)
+	PeekKeyFromValue(value interface{}) (key interface{}, ok bool) // Peek means check but NOT bring to top
+	Put(key, value interface{})
+}
+
+type lru struct {
+	capacity         int
+	doubleLinkedlist *list.List
+	keyToElement     *sync.Map
+	valueToElement   *sync.Map
+	mu               *sync.Mutex
+}
+
+type lruElement struct {
+	key   interface{}
+	value interface{}
+}
+
+// NewLru init a lru cache
+func NewLru(cap int) Lru {
+	return lru{
+		capacity:         cap,
+		doubleLinkedlist: list.New(),
+		keyToElement:     new(sync.Map),
+		valueToElement:   new(sync.Map),
+		mu:               new(sync.Mutex),
+	}
+}
+
+func (l lru) Get(key interface{}) (value interface{}, ok bool) {
+	if v, ok := l.keyToElement.Load(key); ok {
+		element := v.(*list.Element)
+		l.doubleLinkedlist.MoveBefore(element, l.doubleLinkedlist.Front())
+		return element.Value.(lruElement).value, true
+	}
+	return nil, false
+}
+
+func (l lru) GetKeyFromValue(value interface{}) (key interface{}, ok bool) {
+	if k, ok := l.valueToElement.Load(value); ok {
+		element := k.(*list.Element)
+		l.doubleLinkedlist.MoveBefore(element, l.doubleLinkedlist.Front())
+		return element.Value.(lruElement).key, true
+	}
+	return nil, false
+}
+
+func (l lru) PeekKeyFromValue(value interface{}) (key interface{}, ok bool) {
+	if k, ok := l.valueToElement.Load(value); ok {
+		element := k.(*list.Element)
+		return element.Value.(lruElement).key, true
+	}
+	return nil, false
+}
+
+func (l lru) Put(key, value interface{}) {
+	e := lruElement{key, value}
+	if v, ok := l.keyToElement.Load(key); ok {
+		element := v.(*list.Element)
+		element.Value = e
+		l.doubleLinkedlist.MoveBefore(element, l.doubleLinkedlist.Front())
+	} else {
+		l.mu.Lock()
+		element := l.doubleLinkedlist.PushFront(e)
+		l.keyToElement.Store(key, element)
+		l.valueToElement.Store(value, element)
+		if l.doubleLinkedlist.Len() > l.capacity {
+			toBeRemove := l.doubleLinkedlist.Back()
+			l.doubleLinkedlist.Remove(toBeRemove)
+			l.keyToElement.Delete(toBeRemove.Value.(lruElement).key)
+			l.valueToElement.Delete(toBeRemove.Value.(lruElement).value)
+		}
+		l.mu.Unlock()
+	}
+}

common/cache/lru_test.go

@@ -0,0 +1,86 @@
+package cache_test
+
+import (
+	"testing"
+
+	. "github.com/xtls/xray-core/common/cache"
+)
+
+func TestLruReplaceValue(t *testing.T) {
+	lru := NewLru(2)
+	lru.Put(2, 6)
+	lru.Put(1, 5)
+	lru.Put(1, 2)
+	v, _ := lru.Get(1)
+	if v != 2 {
+		t.Error("should get 2", v)
+	}
+	v, _ = lru.Get(2)
+	if v != 6 {
+		t.Error("should get 6", v)
+	}
+}
+
+func TestLruRemoveOld(t *testing.T) {
+	lru := NewLru(2)
+	v, ok := lru.Get(2)
+	if ok {
+		t.Error("should get nil", v)
+	}
+	lru.Put(1, 1)
+	lru.Put(2, 2)
+	v, _ = lru.Get(1)
+	if v != 1 {
+		t.Error("should get 1", v)
+	}
+	lru.Put(3, 3)
+	v, ok = lru.Get(2)
+	if ok {
+		t.Error("should get nil", v)
+	}
+	lru.Put(4, 4)
+	v, ok = lru.Get(1)
+	if ok {
+		t.Error("should get nil", v)
+	}
+	v, _ = lru.Get(3)
+	if v != 3 {
+		t.Error("should get 3", v)
+	}
+	v, _ = lru.Get(4)
+	if v != 4 {
+		t.Error("should get 4", v)
+	}
+}
+
+func TestGetKeyFromValue(t *testing.T) {
+	lru := NewLru(2)
+	lru.Put(3, 3)
+	lru.Put(2, 2)
+	lru.GetKeyFromValue(3)
+	lru.Put(1, 1)
+	v, ok := lru.GetKeyFromValue(2)
+	if ok {
+		t.Error("should get nil", v)
+	}
+	v, _ = lru.GetKeyFromValue(3)
+	if v != 3 {
+		t.Error("should get 3", v)
+	}
+}
+
+func TestPeekKeyFromValue(t *testing.T) {
+	lru := NewLru(2)
+	lru.Put(3, 3)
+	lru.Put(2, 2)
+	lru.PeekKeyFromValue(3)
+	lru.Put(1, 1)
+	v, ok := lru.PeekKeyFromValue(3)
+	if ok {
+		t.Error("should get nil", v)
+	}
+	v, _ = lru.PeekKeyFromValue(2)
+	if v != 2 {
+		t.Error("should get 2", v)
+	}
+}

common/errors/errors.go

@@ -40,10 +40,8 @@ func (err *Error) pkgPath() string {
 		return ""
 	}
 	path := reflect.TypeOf(err.pathObj).PkgPath()
-	for i := 0; i < len(path); i++ {
-		if path[i] == '/' {
-			return path[trim:]
-		}
+	if len(path) >= trim {
+		return path[trim:]
 	}
 	return path
 }

common/log/dns.go

@@ -0,0 +1,59 @@
+package log
+
+import (
+	"net"
+	"strings"
+	"time"
+)
+
+type DNSLog struct {
+	Server  string
+	Domain  string
+	Result  []net.IP
+	Status  dnsStatus
+	Elapsed time.Duration
+	Error   error
+}
+
+func (l *DNSLog) String() string {
+	builder := &strings.Builder{}
+
+	// Server got answer: domain -> [ip1, ip2] 23ms
+	builder.WriteString(l.Server)
+	builder.WriteString(" ")
+	builder.WriteString(string(l.Status))
+	builder.WriteString(" ")
+	builder.WriteString(l.Domain)
+	builder.WriteString(" -> [")
+	builder.WriteString(joinNetIP(l.Result))
+	builder.WriteString("]")
+
+	if l.Elapsed > 0 {
+		builder.WriteString(" ")
+		builder.WriteString(l.Elapsed.String())
+	}
+	if l.Error != nil {
+		builder.WriteString(" <")
+		builder.WriteString(l.Error.Error())
+		builder.WriteString(">")
+	}
+	return builder.String()
+}
+
+type dnsStatus string
+
+var (
+	DNSQueried  = dnsStatus("got answer:")
+	DNSCacheHit = dnsStatus("cache HIT:")
+)
+
+func joinNetIP(ips []net.IP) string {
+	if len(ips) == 0 {
+		return ""
+	}
+	sips := make([]string, 0, len(ips))
+	for _, ip := range ips {
+		sips = append(sips, ip.String())
+	}
+	return strings.Join(sips, ", ")
+}

common/mux/client.go

@@ -330,7 +330,7 @@ func (m *ClientWorker) handleStatusKeep(meta *FrameMetadata, reader *buf.Buffere
 		return buf.Copy(NewStreamReader(reader), buf.Discard)
 	}
 
-	rr := s.NewReader(reader)
+	rr := s.NewReader(reader, &meta.Target)
 	err := buf.Copy(rr, s.output)
 	if err != nil && buf.IsWriteError(err) {
 		newError("failed to write to downstream. closing session ", s.ID).Base(err).WriteToLog()

common/mux/frame.go

@@ -81,6 +81,9 @@ func (f FrameMetadata) WriteTo(b *buf.Buffer) error {
 		if err := addrParser.WriteAddressPort(b, f.Target.Address, f.Target.Port); err != nil {
 			return err
 		}
+	} else if b.UDP != nil {
+		b.WriteByte(byte(TargetNetworkUDP))
+		addrParser.WriteAddressPort(b, b.UDP.Address, b.UDP.Port)
 	}
 
 	len1 := b.Len()
@@ -119,7 +122,7 @@ func (f *FrameMetadata) UnmarshalFromBuffer(b *buf.Buffer) error {
 	f.Option = bitmask.Byte(b.Byte(3))
 	f.Target.Network = net.Network_Unknown
 
-	if f.SessionStatus == SessionStatusNew {
+	if f.SessionStatus == SessionStatusNew || (f.SessionStatus == SessionStatusKeep && b.Len() != 4) {
 		if b.Len() < 8 {
 			return newError("insufficient buffer: ", b.Len())
 		}

common/mux/reader.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/crypto"
+	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/serial"
 )
 
@@ -12,13 +13,15 @@ import (
 type PacketReader struct {
 	reader io.Reader
 	eof    bool
+	dest   *net.Destination
 }
 
 // NewPacketReader creates a new PacketReader.
-func NewPacketReader(reader io.Reader) *PacketReader {
+func NewPacketReader(reader io.Reader, dest *net.Destination) *PacketReader {
 	return &PacketReader{
 		reader: reader,
 		eof:    false,
+		dest:   dest,
 	}
 }
 
@@ -43,6 +46,9 @@ func (r *PacketReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 		return nil, err
 	}
 	r.eof = true
+	if r.dest != nil && r.dest.Network == net.Network_UDP {
+		b.UDP = r.dest
+	}
 	return buf.MultiBuffer{b}, nil
 }
 

common/mux/server.go

@@ -145,7 +145,7 @@ func (w *ServerWorker) handleStatusNew(ctx context.Context, meta *FrameMetadata,
 		return nil
 	}
 
-	rr := s.NewReader(reader)
+	rr := s.NewReader(reader, &meta.Target)
 	if err := buf.Copy(rr, s.output); err != nil {
 		buf.Copy(rr, buf.Discard)
 		common.Interrupt(s.input)
@@ -168,7 +168,7 @@ func (w *ServerWorker) handleStatusKeep(meta *FrameMetadata, reader *buf.Buffere
 		return buf.Copy(NewStreamReader(reader), buf.Discard)
 	}
 
-	rr := s.NewReader(reader)
+	rr := s.NewReader(reader, &meta.Target)
 	err := buf.Copy(rr, s.output)
 
 	if err != nil && buf.IsWriteError(err) {

common/mux/session.go

@@ -5,6 +5,7 @@ import (
 
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
+	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/protocol"
 )
 
@@ -152,9 +153,9 @@ func (s *Session) Close() error {
 }
 
 // NewReader creates a buf.Reader based on the transfer type of this Session.
-func (s *Session) NewReader(reader *buf.BufferedReader) buf.Reader {
+func (s *Session) NewReader(reader *buf.BufferedReader, dest *net.Destination) buf.Reader {
 	if s.transferType == protocol.TransferTypeStream {
 		return NewStreamReader(reader)
 	}
-	return NewPacketReader(reader)
+	return NewPacketReader(reader, dest)
 }

common/mux/writer.go

@@ -63,6 +63,9 @@ func (w *Writer) writeMetaOnly() error {
 
 func writeMetaWithFrame(writer buf.Writer, meta FrameMetadata, data buf.MultiBuffer) error {
 	frame := buf.New()
+	if len(data) == 1 {
+		frame.UDP = data[0].UDP
+	}
 	if err := meta.WriteTo(frame); err != nil {
 		return err
 	}

common/platform/others.go

@@ -30,6 +30,7 @@ func GetAssetLocation(file string) string {
 		defPath,
 		filepath.Join("/usr/local/share/xray/", file),
 		filepath.Join("/usr/share/xray/", file),
+		filepath.Join("/opt/share/xray/", file),
 	} {
 		if _, err := os.Stat(p); os.IsNotExist(err) {
 			continue

common/protocol/address_test.go

@@ -55,7 +55,7 @@ func TestAddressReading(t *testing.T) {
 		},
 		{
 			Options: []AddressOption{AddressFamilyByte(0x03, net.AddressFamilyDomain)},
-			Input:   []byte{3, 9, 118, 50, 114, 97, 121, 46, 99, 111, 109, 0, 80},
+			Input:   []byte{3, 11, 101, 120, 97, 109, 112, 108, 101, 46, 99, 111, 109, 0, 80},
 			Address: net.DomainAddress("example.com"),
 			Port:    net.Port(80),
 		},
@@ -84,8 +84,9 @@ func TestAddressReading(t *testing.T) {
 	}
 
 	for _, tc := range data {
-		b := buf.New()
 		parser := NewAddressParser(tc.Options...)
+
+		b := buf.New()
 		addr, port, err := parser.ReadAddressPort(b, bytes.NewReader(tc.Input))
 		b.Release()
 		if tc.Error {

common/protocol/headers.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.14.0
+// 	protoc        v3.15.4
 // source: common/protocol/headers.proto
 
 package protocol
@@ -34,6 +34,7 @@ const (
 	SecurityType_AES128_GCM        SecurityType = 3
 	SecurityType_CHACHA20_POLY1305 SecurityType = 4
 	SecurityType_NONE              SecurityType = 5
+	SecurityType_ZERO              SecurityType = 6
 )
 
 // Enum value maps for SecurityType.
@@ -45,6 +46,7 @@ var (
 		3: "AES128_GCM",
 		4: "CHACHA20_POLY1305",
 		5: "NONE",
+		6: "ZERO",
 	}
 	SecurityType_value = map[string]int32{
 		"UNKNOWN":           0,
@@ -53,6 +55,7 @@ var (
 		"AES128_GCM":        3,
 		"CHACHA20_POLY1305": 4,
 		"NONE":              5,
+		"ZERO":              6,
 	}
 )
 
@@ -141,19 +144,20 @@ var file_common_protocol_headers_proto_rawDesc = []byte{
 	0x01, 0x20, 0x01, 0x28, 0x0e, 0x32, 0x22, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d,
 	0x6d, 0x6f, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x2e, 0x53, 0x65, 0x63,
 	0x75, 0x72, 0x69, 0x74, 0x79, 0x54, 0x79, 0x70, 0x65, 0x52, 0x04, 0x74, 0x79, 0x70, 0x65, 0x2a,
-	0x62, 0x0a, 0x0c, 0x53, 0x65, 0x63, 0x75, 0x72, 0x69, 0x74, 0x79, 0x54, 0x79, 0x70, 0x65, 0x12,
+	0x6c, 0x0a, 0x0c, 0x53, 0x65, 0x63, 0x75, 0x72, 0x69, 0x74, 0x79, 0x54, 0x79, 0x70, 0x65, 0x12,
 	0x0b, 0x0a, 0x07, 0x55, 0x4e, 0x4b, 0x4e, 0x4f, 0x57, 0x4e, 0x10, 0x00, 0x12, 0x0a, 0x0a, 0x06,
 	0x4c, 0x45, 0x47, 0x41, 0x43, 0x59, 0x10, 0x01, 0x12, 0x08, 0x0a, 0x04, 0x41, 0x55, 0x54, 0x4f,
 	0x10, 0x02, 0x12, 0x0e, 0x0a, 0x0a, 0x41, 0x45, 0x53, 0x31, 0x32, 0x38, 0x5f, 0x47, 0x43, 0x4d,
 	0x10, 0x03, 0x12, 0x15, 0x0a, 0x11, 0x43, 0x48, 0x41, 0x43, 0x48, 0x41, 0x32, 0x30, 0x5f, 0x50,
 	0x4f, 0x4c, 0x59, 0x31, 0x33, 0x30, 0x35, 0x10, 0x04, 0x12, 0x08, 0x0a, 0x04, 0x4e, 0x4f, 0x4e,
-	0x45, 0x10, 0x05, 0x42, 0x5e, 0x0a, 0x18, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e,
-	0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x50,
-	0x01, 0x5a, 0x29, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74,
-	0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x63, 0x6f, 0x6d,
-	0x6d, 0x6f, 0x6e, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0xaa, 0x02, 0x14, 0x58,
-	0x72, 0x61, 0x79, 0x2e, 0x43, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x50, 0x72, 0x6f, 0x74, 0x6f,
-	0x63, 0x6f, 0x6c, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x45, 0x10, 0x05, 0x12, 0x08, 0x0a, 0x04, 0x5a, 0x45, 0x52, 0x4f, 0x10, 0x06, 0x42, 0x5e, 0x0a,
+	0x18, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e,
+	0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x50, 0x01, 0x5a, 0x29, 0x67, 0x69, 0x74,
+	0x68, 0x75, 0x62, 0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61,
+	0x79, 0x2d, 0x63, 0x6f, 0x72, 0x65, 0x2f, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2f, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0xaa, 0x02, 0x14, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x43, 0x6f,
+	0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x62, 0x06, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (

common/protocol/headers.proto

@@ -13,6 +13,7 @@ enum SecurityType {
   AES128_GCM = 3;
   CHACHA20_POLY1305 = 4;
   NONE = 5;
+  ZERO = 6;
 }
 
 message SecurityConfig {

common/session/session.go

@@ -63,6 +63,7 @@ type SniffingRequest struct {
 	ExcludeForDomain               []string
 	OverrideDestinationForProtocol []string
 	Enabled                        bool
+	MetadataOnly                   bool
 }
 
 // Content is the metadata of the connection content.

common/xudp/xudp.go

@@ -0,0 +1,137 @@
+package xudp
+
+import (
+	"io"
+
+	"github.com/xtls/xray-core/common/buf"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/protocol"
+)
+
+var addrParser = protocol.NewAddressParser(
+	protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv4), net.AddressFamilyIPv4),
+	protocol.AddressFamilyByte(byte(protocol.AddressTypeDomain), net.AddressFamilyDomain),
+	protocol.AddressFamilyByte(byte(protocol.AddressTypeIPv6), net.AddressFamilyIPv6),
+	protocol.PortThenAddress(),
+)
+
+func NewPacketWriter(writer buf.Writer, dest net.Destination) *PacketWriter {
+	return &PacketWriter{
+		Writer: writer,
+		Dest:   dest,
+	}
+}
+
+type PacketWriter struct {
+	Writer buf.Writer
+	Dest   net.Destination
+}
+
+func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
+	defer buf.ReleaseMulti(mb)
+	mb2Write := make(buf.MultiBuffer, 0, len(mb))
+	for _, b := range mb {
+		length := b.Len()
+		if length == 0 || length+666 > buf.Size {
+			continue
+		}
+
+		eb := buf.New()
+		eb.Write([]byte{0, 0, 0, 0})
+		if w.Dest.Network == net.Network_UDP {
+			eb.WriteByte(1) // New
+			eb.WriteByte(1) // Opt
+			eb.WriteByte(2) // UDP
+			addrParser.WriteAddressPort(eb, w.Dest.Address, w.Dest.Port)
+			w.Dest.Network = net.Network_Unknown
+		} else {
+			eb.WriteByte(2) // Keep
+			eb.WriteByte(1)
+			if b.UDP != nil {
+				eb.WriteByte(2)
+				addrParser.WriteAddressPort(eb, b.UDP.Address, b.UDP.Port)
+			}
+		}
+		l := eb.Len() - 2
+		eb.SetByte(0, byte(l>>8))
+		eb.SetByte(1, byte(l))
+		eb.WriteByte(byte(length >> 8))
+		eb.WriteByte(byte(length))
+		eb.Write(b.Bytes())
+
+		mb2Write = append(mb2Write, eb)
+	}
+	if mb2Write.IsEmpty() {
+		return nil
+	}
+	return w.Writer.WriteMultiBuffer(mb2Write)
+}
+
+func NewPacketReader(reader io.Reader) *PacketReader {
+	return &PacketReader{
+		Reader: reader,
+		cache:  make([]byte, 2),
+	}
+}
+
+type PacketReader struct {
+	Reader io.Reader
+	cache  []byte
+}
+
+func (r *PacketReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
+	for {
+		if _, err := io.ReadFull(r.Reader, r.cache); err != nil {
+			return nil, err
+		}
+		l := int32(r.cache[0])<<8 | int32(r.cache[1])
+		if l < 4 {
+			return nil, io.EOF
+		}
+		b := buf.New()
+		if _, err := b.ReadFullFrom(r.Reader, l); err != nil {
+			b.Release()
+			return nil, err
+		}
+		discard := false
+		switch b.Byte(2) {
+		case 2:
+			if l != 4 {
+				b.Advance(5)
+				addr, port, err := addrParser.ReadAddressPort(nil, b)
+				if err != nil {
+					b.Release()
+					return nil, err
+				}
+				b.UDP = &net.Destination{
+					Network: net.Network_UDP,
+					Address: addr,
+					Port:    port,
+				}
+			}
+		case 4:
+			discard = true
+		default:
+			b.Release()
+			return nil, io.EOF
+		}
+		if b.Byte(3) == 1 {
+			if _, err := io.ReadFull(r.Reader, r.cache); err != nil {
+				b.Release()
+				return nil, err
+			}
+			length := int32(r.cache[0])<<8 | int32(r.cache[1])
+			if length > 0 {
+				b.Clear()
+				if _, err := b.ReadFullFrom(r.Reader, length); err != nil {
+					b.Release()
+					return nil, err
+				}
+				if !discard {
+					return buf.MultiBuffer{b}, nil
+				}
+			}
+		}
+		b.Release()
+	}
+}

core/config.go

@@ -22,9 +22,13 @@ type ConfigFormat struct {
 // ConfigLoader is a utility to load Xray config from external source.
 type ConfigLoader func(input interface{}) (*Config, error)
 
+// ConfigBuilder is a builder to build core.Config from filenames and formats
+type ConfigBuilder func(files []string, formats []string) (*Config, error)
+
 var (
-	configLoaderByName = make(map[string]*ConfigFormat)
-	configLoaderByExt  = make(map[string]*ConfigFormat)
+	configLoaderByName    = make(map[string]*ConfigFormat)
+	configLoaderByExt     = make(map[string]*ConfigFormat)
+	ConfigBuilderForFiles ConfigBuilder
 )
 
 // RegisterConfigLoader add a new ConfigLoader.
@@ -46,6 +50,21 @@ func RegisterConfigLoader(format *ConfigFormat) error {
 	return nil
 }
 
+func GetFormatByExtension(ext string) string {
+	switch strings.ToLower(ext) {
+	case "pb", "protobuf":
+		return "protobuf"
+	case "yaml", "yml":
+		return "yaml"
+	case "toml":
+		return "toml"
+	case "json":
+		return "json"
+	default:
+		return ""
+	}
+}
+
 func getExtension(filename string) string {
 	idx := strings.LastIndexByte(filename, '.')
 	if idx == -1 {
@@ -54,23 +73,48 @@ func getExtension(filename string) string {
 	return filename[idx+1:]
 }
 
-// LoadConfig loads config with given format from given source.
-// input accepts 2 different types:
-// * []string slice of multiple filename/url(s) to open to read
-// * io.Reader that reads a config content (the original way)
-func LoadConfig(formatName string, filename string, input interface{}) (*Config, error) {
-	ext := getExtension(filename)
-	if len(ext) > 0 {
-		if f, found := configLoaderByExt[ext]; found {
-			return f.Loader(input)
+func getFormat(filename string) string {
+	return GetFormatByExtension(getExtension(filename))
+}
+
+func LoadConfig(formatName string, input interface{}) (*Config, error) {
+	switch v := input.(type) {
+	case cmdarg.Arg:
+
+		formats := make([]string, len(v))
+		hasProtobuf := false
+		for i, file := range v {
+			f := getFormat(file)
+			if f == "" {
+				f = formatName
+			}
+			if f == "protobuf" {
+				hasProtobuf = true
+			}
+			formats[i] = f
+		}
+
+		// only one protobuf config file is allowed
+		if hasProtobuf {
+			if len(v) == 1 {
+				return configLoaderByName["protobuf"].Loader(v)
+			} else {
+				return nil, newError("Only one protobuf config file is allowed").AtWarning()
+			}
+		}
+
+		// to avoid import cycle
+		return ConfigBuilderForFiles(v, formats)
+
+	case io.Reader:
+		if f, found := configLoaderByName[formatName]; found {
+			return f.Loader(v)
+		} else {
+			return nil, newError("Unable to load config in", formatName).AtWarning()
 		}
 	}
 
-	if f, found := configLoaderByName[formatName]; found {
-		return f.Loader(input)
-	}
-
-	return nil, newError("Unable to load config in ", formatName).AtWarning()
+	return nil, newError("Unable to load config").AtWarning()
 }
 
 func loadProtobufConfig(data []byte) (*Config, error) {

core/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
 // 	protoc-gen-go v1.25.0
-// 	protoc        v3.14.0
+// 	protoc        v3.15.6
 // source: core/config.proto
 
 package core
@@ -9,7 +9,7 @@ package core
 import (
 	proto "github.com/golang/protobuf/proto"
 	serial "github.com/xtls/xray-core/common/serial"
-	transport "github.com/xtls/xray-core/transport"
+	global "github.com/xtls/xray-core/transport/global"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -48,7 +48,7 @@ type Config struct {
 	// config. Date to remove: 2020-01-13
 	//
 	// Deprecated: Do not use.
-	Transport *transport.Config `protobuf:"bytes,5,opt,name=transport,proto3" json:"transport,omitempty"`
+	Transport *global.Config `protobuf:"bytes,5,opt,name=transport,proto3" json:"transport,omitempty"`
 	// Configuration for extensions. The config may not work if corresponding
 	// extension is not loaded into Xray. Xray will ignore such config during
 	// initialization.
@@ -109,7 +109,7 @@ func (x *Config) GetApp() []*serial.TypedMessage {
 }
 
 // Deprecated: Do not use.
-func (x *Config) GetTransport() *transport.Config {
+func (x *Config) GetTransport() *global.Config {
 	if x != nil {
 		return x.Transport
 	}
@@ -283,59 +283,60 @@ var file_core_config_proto_rawDesc = []byte{
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 }
 
 var (
@@ -356,7 +357,7 @@ var file_core_config_proto_goTypes = []interface{}{
 	(*InboundHandlerConfig)(nil),  // 1: xray.core.InboundHandlerConfig
 	(*OutboundHandlerConfig)(nil), // 2: xray.core.OutboundHandlerConfig
 	(*serial.TypedMessage)(nil),   // 3: xray.common.serial.TypedMessage
-	(*transport.Config)(nil),      // 4: xray.transport.Config
+	(*global.Config)(nil),         // 4: xray.transport.Config
 }
 var file_core_config_proto_depIdxs = []int32{
 	1, // 0: xray.core.Config.inbound:type_name -> xray.core.InboundHandlerConfig

core/config.proto

@@ -7,7 +7,7 @@ option java_package = "com.xray.core";
 option java_multiple_files = true;
 
 import "common/serial/typed_message.proto";
-import "transport/config.proto";
+import "transport/global/config.proto";
 
 // Config is the master config of Xray. Xray takes this config as input and
 // functions accordingly.

core/core.go

@@ -18,7 +18,7 @@ import (
 )
 
 var (
-	version  = "1.2.3"
+	version  = "1.4.0"
 	build    = "Custom"
 	codename = "Xray, Penetrates Everything."
 	intro    = "A unified platform for anti-censorship."

core/functions.go

@@ -25,7 +25,7 @@ func CreateObject(v *Instance, config interface{}) (interface{}, error) {
 //
 // xray:api:stable
 func StartInstance(configFormat string, configBytes []byte) (*Instance, error) {
-	config, err := LoadConfig(configFormat, "", bytes.NewReader(configBytes))
+	config, err := LoadConfig(configFormat, bytes.NewReader(configBytes))
 	if err != nil {
 		return nil, err
 	}

core/xray.go

@@ -2,14 +2,10 @@ package core
 
 import (
 	"context"
+	"os"
 	"reflect"
-	"runtime/debug"
-	"strings"
 	"sync"
 
-	"github.com/golang/protobuf/proto"
-
-	"github.com/xtls/xray-core/app/proxyman"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/serial"
 	"github.com/xtls/xray-core/features"
@@ -20,6 +16,7 @@ import (
 	"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/internet"
 )
 
 // Server is an instance of Xray. At any time, there must be at most one Server instance running.
@@ -184,30 +181,7 @@ func NewWithContext(ctx context.Context, config *Config) (*Instance, error) {
 }
 
 func initInstanceWithConfig(config *Config, server *Instance) (bool, error) {
-	cone := true
-	v, t := false, false
-	for _, outbound := range config.Outbound {
-		s := strings.ToLower(outbound.ProxySettings.Type)
-		l := len(s)
-		if l >= 16 && s[11:16] == "vless" || l >= 16 && s[11:16] == "vmess" {
-			v = true
-			continue
-		}
-		if l >= 17 && s[11:17] == "trojan" || l >= 22 && s[11:22] == "shadowsocks" {
-			t = true
-			var m proxyman.SenderConfig
-			proto.Unmarshal(outbound.SenderSettings.Value, &m)
-			if m.MultiplexSettings != nil && m.MultiplexSettings.Enabled {
-				cone = false
-				break
-			}
-		}
-	}
-	if v && !t {
-		cone = false
-	}
-	server.ctx = context.WithValue(server.ctx, "cone", cone)
-	defer debug.FreeOSMemory()
+	server.ctx = context.WithValue(server.ctx, "cone", os.Getenv("XRAY_CONE_DISABLED") != "true")
 
 	if config.Transport != nil {
 		features.PrintDeprecatedFeatureWarning("global transport settings")
@@ -250,6 +224,14 @@ func initInstanceWithConfig(config *Config, server *Instance) (bool, error) {
 		}
 	}
 
+	internet.InitSystemDialer(
+		server.GetFeature(dns.ClientType()).(dns.Client),
+		func() outbound.Manager {
+			obm, _ := server.GetFeature(outbound.ManagerType()).(outbound.Manager)
+			return obm
+		}(),
+	)
+
 	if server.featureResolutions != nil {
 		return true, newError("not all dependency are resolved.")
 	}

features/dns/client.go

@@ -7,6 +7,13 @@ import (
 	"github.com/xtls/xray-core/features"
 )
 
+// IPOption is an object for IP query options.
+type IPOption struct {
+	IPv4Enable bool
+	IPv6Enable bool
+	FakeEnable bool
+}
+
 // Client is a Xray feature for querying DNS information.
 //
 // xray:api:stable
@@ -14,21 +21,7 @@ type Client interface {
 	features.Feature
 
 	// LookupIP returns IP address for the given domain. IPs may contain IPv4 and/or IPv6 addresses.
-	LookupIP(domain string) ([]net.IP, error)
-}
-
-// IPv4Lookup is an optional feature for querying IPv4 addresses only.
-//
-// xray:api:beta
-type IPv4Lookup interface {
-	LookupIPv4(domain string) ([]net.IP, error)
-}
-
-// IPv6Lookup is an optional feature for querying IPv6 addresses only.
-//
-// xray:api:beta
-type IPv6Lookup interface {
-	LookupIPv6(domain string) ([]net.IP, error)
+	LookupIP(domain string, option IPOption) ([]net.IP, error)
 }
 
 // ClientType returns the type of Client interface. Can be used for implementing common.HasType.

features/dns/fakedns.go

@@ -0,0 +1,17 @@
+package dns
+
+import (
+	gonet "net"
+
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/features"
+)
+
+type FakeDNSEngine interface {
+	features.Feature
+	GetFakeIPForDomain(domain string) []net.Address
+	GetDomainFromFakeDNS(ip net.Address) string
+	GetFakeIPRange() *gonet.IPNet
+}
+
+var FakeIPPool = "198.18.0.0/16"

features/dns/localdns/client.go

@@ -20,58 +20,41 @@ func (*Client) Start() error { return nil }
 func (*Client) Close() error { return nil }
 
 // LookupIP implements Client.
-func (*Client) LookupIP(host string) ([]net.IP, error) {
+func (*Client) LookupIP(host string, option dns.IPOption) ([]net.IP, error) {
 	ips, err := net.LookupIP(host)
 	if err != nil {
 		return nil, err
 	}
 	parsedIPs := make([]net.IP, 0, len(ips))
+	ipv4 := make([]net.IP, 0, len(ips))
+	ipv6 := make([]net.IP, 0, len(ips))
 	for _, ip := range ips {
 		parsed := net.IPAddress(ip)
 		if parsed != nil {
 			parsedIPs = append(parsedIPs, parsed.IP())
 		}
-	}
-	if len(parsedIPs) == 0 {
-		return nil, dns.ErrEmptyResponse
-	}
-	return parsedIPs, nil
-}
-
-// LookupIPv4 implements IPv4Lookup.
-func (c *Client) LookupIPv4(host string) ([]net.IP, error) {
-	ips, err := c.LookupIP(host)
-	if err != nil {
-		return nil, err
-	}
-	ipv4 := make([]net.IP, 0, len(ips))
-	for _, ip := range ips {
 		if len(ip) == net.IPv4len {
 			ipv4 = append(ipv4, ip)
 		}
-	}
-	if len(ipv4) == 0 {
-		return nil, dns.ErrEmptyResponse
-	}
-	return ipv4, nil
-}
-
-// LookupIPv6 implements IPv6Lookup.
-func (c *Client) LookupIPv6(host string) ([]net.IP, error) {
-	ips, err := c.LookupIP(host)
-	if err != nil {
-		return nil, err
-	}
-	ipv6 := make([]net.IP, 0, len(ips))
-	for _, ip := range ips {
 		if len(ip) == net.IPv6len {
 			ipv6 = append(ipv6, ip)
 		}
 	}
-	if len(ipv6) == 0 {
-		return nil, dns.ErrEmptyResponse
+	switch {
+	case option.IPv4Enable && option.IPv6Enable:
+		if len(parsedIPs) > 0 {
+			return parsedIPs, nil
+		}
+	case option.IPv4Enable:
+		if len(ipv4) > 0 {
+			return ipv4, nil
+		}
+	case option.IPv6Enable:
+		if len(ipv6) > 0 {
+			return ipv6, nil
+		}
 	}
-	return ipv6, nil
+	return nil, dns.ErrEmptyResponse
 }
 
 // New create a new dns.Client that queries localhost for DNS.

features/dns/localdns/errors.generated.go

@@ -0,0 +1,9 @@
+package localdns
+
+import "github.com/xtls/xray-core/common/errors"
+
+type errPathObjHolder struct{}
+
+func newError(values ...interface{}) *errors.Error {
+	return errors.New(values...).WithPathObj(errPathObjHolder{})
+}

features/routing/dns/context.go

@@ -26,7 +26,11 @@ func (ctx *ResolvableContext) GetTargetIPs() []net.IP {
 	}
 
 	if domain := ctx.GetTargetDomain(); len(domain) != 0 {
-		ips, err := ctx.dnsClient.LookupIP(domain)
+		ips, err := ctx.dnsClient.LookupIP(domain, dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		})
 		if err == nil {
 			ctx.resolvedIPs = ips
 			return ips

go.mod

@@ -1,26 +1,26 @@
 module github.com/xtls/xray-core
 
-go 1.15
+go 1.16
 
 require (
 	github.com/ghodss/yaml v1.0.1-0.20190212211648-25d852aebe32
-	github.com/golang/mock v1.4.4
+	github.com/golang/mock v1.5.0
 	github.com/golang/protobuf v1.4.3
-	github.com/google/go-cmp v0.5.4
+	github.com/google/go-cmp v0.5.5
 	github.com/gorilla/websocket v1.4.2
 	github.com/lucas-clemente/quic-go v0.19.3
-	github.com/miekg/dns v1.1.35
+	github.com/miekg/dns v1.1.40
 	github.com/pelletier/go-toml v1.8.1
-	github.com/pires/go-proxyproto v0.4.1
+	github.com/pires/go-proxyproto v0.5.0
 	github.com/seiflotfy/cuckoofilter v0.0.0-20201222105146-bc6005554a0c
 	github.com/stretchr/testify v1.7.0
 	github.com/xtls/go v0.0.0-20201118062508-3632bf3b7499
-	go.starlark.net v0.0.0-20210121225809-cea917ab6e0f
-	golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad
-	golang.org/x/net v0.0.0-20210119194325-5f4716e94777
-	golang.org/x/sync v0.0.0-20201207232520-09787c993a3a
-	golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4
-	google.golang.org/grpc v1.35.0
+	go.starlark.net v0.0.0-20210312235212-74c10e2c17dc
+	golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83
+	golang.org/x/net v0.0.0-20210226172049-e18ecbb05110
+	golang.org/x/sync v0.0.0-20210220032951-036812b2e83c
+	golang.org/x/sys v0.0.0-20210313202042-bd2e13477e9c
+	google.golang.org/grpc v1.36.0
 	google.golang.org/protobuf v1.25.0
 	h12.io/socks v1.0.2
 )

go.sum

@@ -49,8 +49,9 @@ github.com/golang/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:tluoj9z5200j
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
 github.com/golang/mock v1.4.0/go.mod h1:UOMv5ysSaYNkG+OFQykRIcU/QvvxJf3p21QfJ2Bt3cw=
-github.com/golang/mock v1.4.4 h1:l75CXGRSwbaYNpl/Z2X1XIIAMSCquvXgpVZDhwEIJsc=
 github.com/golang/mock v1.4.4/go.mod h1:l3mdAwkq5BuhzHwde/uurv3sEJeZMXNpwsxVWU71h+4=
+github.com/golang/mock v1.5.0 h1:jlYHihg//f7RRwuPfptm04yp4s7O6Kw8EZiVYIGcH0g=
+github.com/golang/mock v1.5.0/go.mod h1:CWnOUgYIOo4TcNZ0wHX3YZCqsaM1I1Jvs6v3mP3KVu8=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
@@ -69,8 +70,9 @@ github.com/google/go-cmp v0.3.0/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMyw
 github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
 github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
-github.com/google/go-cmp v0.5.4 h1:L8R9j+yAqZuZjsqh/z+F1NCffTKKLShY6zXTItVIZ8M=
-github.com/google/go-cmp v0.5.4/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.1/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
+github.com/google/go-cmp v0.5.5 h1:Khx7svrCpmxxtHBq5j2mp/xVjsi8hQMfNLvJFAlrGgU=
+github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
 github.com/google/go-github v17.0.0+incompatible/go.mod h1:zLgOLi98H3fifZn+44m+umXrS52loVEgC2AApnigrVQ=
 github.com/google/go-querystring v1.0.0/go.mod h1:odCYkC5MyYFN7vkCjXpyrEuKhc/BUO6wN/zVPAxq5ck=
 github.com/google/martian v2.1.0+incompatible/go.mod h1:9I4somxYTbIHy5NJKHRl3wXiIaQGbYVAs8BPL6v8lEs=
@@ -107,8 +109,8 @@ github.com/marten-seemann/qtls-go1-15 v0.1.1 h1:LIH6K34bPVttyXnUWixk0bzH6/N07Vxb
 github.com/marten-seemann/qtls-go1-15 v0.1.1/go.mod h1:GyFwywLKkRt+6mfU99csTEY1joMZz5vmB1WNZH3P81I=
 github.com/matttproud/golang_protobuf_extensions v1.0.1/go.mod h1:D8He9yQNgCq6Z5Ld7szi9bcBfOoFv/3dc6xSMkL2PC0=
 github.com/microcosm-cc/bluemonday v1.0.1/go.mod h1:hsXNsILzKxV+sX77C5b8FSuKF00vh2OMYv+xgHpAMF4=
-github.com/miekg/dns v1.1.35 h1:oTfOaDH+mZkdcgdIjH6yBajRGtIwcwcaR+rt23ZSrJs=
-github.com/miekg/dns v1.1.35/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
+github.com/miekg/dns v1.1.40 h1:pyyPFfGMnciYUk/mXpKkVmeMQjfXqt3FAJ2hy7tPiLA=
+github.com/miekg/dns v1.1.40/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
 github.com/modern-go/concurrent v0.0.0-20180306012644-bacd9c7ef1dd/go.mod h1:6dJC0mAP4ikYIbvyc7fijjWJddQyLn8Ig3JB5CqoB9Q=
 github.com/modern-go/reflect2 v1.0.1/go.mod h1:bx2lNnkwVCuqBIxFjflWJWanXIb3RllmbCylyMrvgv0=
 github.com/neelance/astrewrite v0.0.0-20160511093645-99348263ae86/go.mod h1:kHJEU3ofeGjhHklVoIGuVj85JJwZ6kWPaJwCIxgnFmo=
@@ -127,8 +129,8 @@ github.com/pelletier/go-toml v1.8.1 h1:1Nf83orprkJyknT6h7zbuEGUEjcyVlCxSUGTENmNC
 github.com/pelletier/go-toml v1.8.1/go.mod h1:T2/BmBdy8dvIRq1a/8aqjN41wvWlN4lrapLU/GW4pbc=
 github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2 h1:JhzVVoYvbOACxoUmOs6V/G4D5nPVUW73rKvXxP4XUJc=
 github.com/phayes/freeport v0.0.0-20180830031419-95f893ade6f2/go.mod h1:iIss55rKnNBTvrwdmkUpLnDpZoAHvWaiq5+iMmen4AE=
-github.com/pires/go-proxyproto v0.4.1 h1:30QkyOjKU3FcTLiu1359sSQ7ml56wpM4i/uViqODSsI=
-github.com/pires/go-proxyproto v0.4.1/go.mod h1:Odh9VFOZJCf9G8cLW5o435Xf1J95Jw9Gw5rnCjcwzAY=
+github.com/pires/go-proxyproto v0.5.0 h1:A4Jv4ZCaV3AFJeGh5mGwkz4iuWUYMlQ7IoO/GTuSuLo=
+github.com/pires/go-proxyproto v0.5.0/go.mod h1:Odh9VFOZJCf9G8cLW5o435Xf1J95Jw9Gw5rnCjcwzAY=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
@@ -169,7 +171,6 @@ github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
 github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
-github.com/stretchr/testify v1.6.1 h1:hDPOHmpOpP40lSULcqw7IrRb/u7w6RpDC9399XyoNd0=
 github.com/stretchr/testify v1.6.1/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
 github.com/stretchr/testify v1.7.0 h1:nwc3DEeHmmLAfoZucVR881uASk0Mfjw8xYJ99tb5CcY=
 github.com/stretchr/testify v1.7.0/go.mod h1:6Fq8oRcR53rry900zMqJjRRixrwX3KX962/h/Wwjteg=
@@ -180,8 +181,8 @@ github.com/xtls/go v0.0.0-20201118062508-3632bf3b7499 h1:QHESTXtfgc1ABV+ArlbPVqU
 github.com/xtls/go v0.0.0-20201118062508-3632bf3b7499/go.mod h1:5TB2+k58gx4A4g2Nf5miSHNDF6CuAzHKpWBooLAshTs=
 go.opencensus.io v0.18.0/go.mod h1:vKdFvxhtzZ9onBp9VKHK8z/sRpBMnKAsufL7wlDrCOA=
 go.opencensus.io v0.22.2/go.mod h1:yxeiOL68Rb0Xd1ddK5vPZ/oVn4vY4Ynel7k9FzqtOIw=
-go.starlark.net v0.0.0-20210121225809-cea917ab6e0f h1:MfDkeyR3bphbh1zJ3Z7cTsZ8Ydd4mXQiBEhcZRltwaM=
-go.starlark.net v0.0.0-20210121225809-cea917ab6e0f/go.mod h1:vxxlMsgCAPH7BR2LtxjJC4WhhZhCGd/b01+CIpj8H4k=
+go.starlark.net v0.0.0-20210312235212-74c10e2c17dc h1:pVkptfeOTFfx+zXZo7HEHN3d5LmhatBFvHdm/f2QnpY=
+go.starlark.net v0.0.0-20210312235212-74c10e2c17dc/go.mod h1:t3mmBBPzAVvK0L0n1drDmrQsJ8FoIx4INCqVMTr/Zo0=
 go4.org v0.0.0-20180809161055-417644f6feb5/go.mod h1:MkTOUMDaeVYJUOUsaDXIhWPZYa1yOyC1qaOBpL57BhE=
 golang.org/x/build v0.0.0-20190111050920-041ab4dc3f9d/go.mod h1:OWs+y06UdEOHN4y+MfF/py+xQ/tYqIWW03b70/CG9Rw=
 golang.org/x/crypto v0.0.0-20181030102418-4d3f4d9ffa16/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
@@ -190,14 +191,15 @@ golang.org/x/crypto v0.0.0-20190313024323-a1f597ede03a/go.mod h1:djNgcEr1/C05ACk
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
 golang.org/x/crypto v0.0.0-20200221231518-2aa609cf4a9d/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad h1:DN0cp81fZ3njFcrLCytUHRSUkqBjfTo4Tx9RJTWs0EY=
-golang.org/x/crypto v0.0.0-20201221181555-eec23a3978ad/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
+golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83 h1:/ZScEX8SfEmUGRHs0gxpqteO5nfNW6axyZbBdw9A12g=
+golang.org/x/crypto v0.0.0-20210220033148-5ea612d1eb83/go.mod h1:jdWPYTVW3xRLrWPugEBEK3UY2ZEsg3UU495nc5E+M+I=
 golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
 golang.org/x/lint v0.0.0-20180702182130-06c8688daad7/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20181026193005-c67002cb31c3/go.mod h1:UVdnD1Gm6xHRNCYTkRU2/jEulfH38KcIWyp/GAMgvoE=
 golang.org/x/lint v0.0.0-20190227174305-5b3e6a55c961/go.mod h1:wehouNa3lNwaWXcvxsM5YxQ5yQlVC4a0KAMCusXpPoU=
 golang.org/x/lint v0.0.0-20190313153728-d0100b6bd8b3/go.mod h1:6SW0HCj/g11FgYtHlgUYUwCkIfeOF89ocIRzGO/8vkc=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
+golang.org/x/mod v0.3.0/go.mod h1:s0Qsj1ACt9ePp/hMypM3fl4fZqREWJwdYDEqhRiZZUA=
 golang.org/x/net v0.0.0-20180724234803-3673e40ba225/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
 golang.org/x/net v0.0.0-20180906233101-161cd47e91fd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
@@ -212,8 +214,8 @@ golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLL
 golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
 golang.org/x/net v0.0.0-20200520004742-59133d7f0dd7/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
 golang.org/x/net v0.0.0-20200707034311-ab3426394381/go.mod h1:/O7V0waA8r7cgGh81Ro3o1hOxt32SMVPicZroKQ2sZA=
-golang.org/x/net v0.0.0-20210119194325-5f4716e94777 h1:003p0dJM77cxMSyCPFphvZf/Y5/NXf5fzg6ufd1/Oew=
-golang.org/x/net v0.0.0-20210119194325-5f4716e94777/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110 h1:qWPm9rbaAMKs8Bq/9LRpbMqxWRVUAQwMI9fVrssnTfw=
+golang.org/x/net v0.0.0-20210226172049-e18ecbb05110/go.mod h1:m0MpNAwzfU5UDzcl9v0D8zg8gWTRqZa9RBIspLL5mdg=
 golang.org/x/oauth2 v0.0.0-20180821212333-d2e6202438be/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181017192945-9dcd33a902f4/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
 golang.org/x/oauth2 v0.0.0-20181203162652-d668ce993890/go.mod h1:N/0e6XlmueqKjAGxoOufVs8QHGRruUQn6yWY3a++T0U=
@@ -225,8 +227,8 @@ golang.org/x/sync v0.0.0-20181221193216-37e7f081c4d4/go.mod h1:RxMgew5VJxzue5/jJ
 golang.org/x/sync v0.0.0-20190227155943-e225da77a7e6/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20201207232520-09787c993a3a h1:DcqTD9SDLc+1P/r1EmRBwnVsrOwW+kk2vWf9n+1sGhs=
-golang.org/x/sync v0.0.0-20201207232520-09787c993a3a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c h1:5KslGYwFpkhGh+Q16bwMP3cOontH8FOep7tGV86Y7SQ=
+golang.org/x/sync v0.0.0-20210220032951-036812b2e83c/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20180830151530-49385e6e1522/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20180909124046-d0be0721c37e/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
 golang.org/x/sys v0.0.0-20181029174526-d69651ed3497/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
@@ -242,10 +244,10 @@ golang.org/x/sys v0.0.0-20191120155948-bd437916bb0e/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20200223170610-d5e6a3e2c0ae/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20200519105757-fe76b779f299/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20200803210538-64077c9b5642/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20201119102817-f84b799fce68/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4 h1:myAQVi0cGEoqQVR5POX+8RR2mrocKqNN1hmeMqhX27k=
-golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20210313202042-bd2e13477e9c h1:coiPEfMv+ThsjULRDygLrJVlNE1gDdL2g65s0LhV2os=
+golang.org/x/sys v0.0.0-20210313202042-bd2e13477e9c/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/term v0.0.0-20201117132131-f5c789dd3221/go.mod h1:Nr5EML6q2oocZ2LXRh80K7BxOlk5/8JxuGnuhpl+muw=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=
 golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
@@ -264,10 +266,13 @@ golang.org/x/tools v0.0.0-20190226205152-f727befe758c/go.mod h1:9Yl7xja0Znq3iFh3
 golang.org/x/tools v0.0.0-20190311212946-11955173bddd/go.mod h1:LCzVGOaR6xXOjkQ3onu1FJEFr0SW1gC7cKk1uF8kGRs=
 golang.org/x/tools v0.0.0-20190425150028-36563e24a262/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
 golang.org/x/tools v0.0.0-20190524140312-2c0ae7006135/go.mod h1:RgjU9mgBXZiqYHBnxXauZ1Gv1EHHAz9KjViQ78xBX0Q=
+golang.org/x/tools v0.0.0-20191119224855-298f0cb1881e/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
 golang.org/x/tools v0.0.0-20191216052735-49a3e744a425/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
-golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543 h1:E7g+9GITq07hpfrRu66IVDexMakfv52eLZ2CXBWiKr4=
 golang.org/x/xerrors v0.0.0-20191204190536-9bdfabe68543/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1 h1:go1bK/D/BFZV2I8cIQd1NKEZ+0owSTG1fDTci4IqFcE=
+golang.org/x/xerrors v0.0.0-20200804184101-5ec99f83aff1/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 google.golang.org/api v0.0.0-20180910000450-7ca32eb868bf/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
 google.golang.org/api v0.0.0-20181030000543-1d582fd0359e/go.mod h1:4mhQ8q/RsB7i+udVvVy5NUi08OU8ZlA0gRVgrF7VFY0=
 google.golang.org/api v0.1.0/go.mod h1:UGEZY7KEX120AnNLIHFMKIo4obdJhkp2tPbaPlQx13Y=
@@ -292,8 +297,8 @@ google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiq
 google.golang.org/grpc v1.23.0/go.mod h1:Y5yQAOtifL1yxbo5wqy6BxZv8vAUGQwXBOALyacEbxg=
 google.golang.org/grpc v1.25.1/go.mod h1:c3i+UQWmh7LiEpx4sFZnkU36qjEYZ0imhYfXVyQciAY=
 google.golang.org/grpc v1.27.0/go.mod h1:qbnxyOmOxrQa7FizSgH+ReBfzJrCY1pSN7KXBS8abTk=
-google.golang.org/grpc v1.35.0 h1:TwIQcH3es+MojMVojxxfQ3l3OF2KzlRxML2xZq0kRo8=
-google.golang.org/grpc v1.35.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
+google.golang.org/grpc v1.36.0 h1:o1bcQ6imQMIOpdrO3SWf2z5RV72WbDwdXuK0MDlc8As=
+google.golang.org/grpc v1.36.0/go.mod h1:qjiiYl8FncCW8feJPdyg3v6XW24KsRHe+dy9BAGRRjU=
 google.golang.org/protobuf v0.0.0-20200109180630-ec00e32a8dfd/go.mod h1:DFci5gLYBciE7Vtevhsrf46CRTquxDuWsQurQQe4oz8=
 google.golang.org/protobuf v0.0.0-20200221191635-4d8936d0db64/go.mod h1:kwYJMbMJ01Woi6D6+Kah6886xMZcty6N08ah7+eCXa0=
 google.golang.org/protobuf v0.0.0-20200228230310-ab0ca4ff8a60/go.mod h1:cfTl7dwQJ+fmap5saPgwCLgHXTUD7jkjRqWcaiX5VyM=

infra/conf/dns_test.go

@@ -21,7 +21,7 @@ func init() {
 	common.Must(err)
 
 	if _, err := os.Stat(platform.GetAssetLocation("geoip.dat")); err != nil && os.IsNotExist(err) {
-		common.Must(filesystem.CopyFile(platform.GetAssetLocation("geoip.dat"), filepath.Join(wd, "..", "..", "release", "config", "geoip.dat")))
+		common.Must(filesystem.CopyFile(platform.GetAssetLocation("geoip.dat"), filepath.Join(wd, "..", "..", "resources", "geoip.dat")))
 	}
 
 	geositeFilePath := filepath.Join(wd, "geosite.dat")
@@ -112,6 +112,11 @@ func TestDNSConfigParsing(t *testing.T) {
 						Domain:        "example.com",
 						ProxiedDomain: "google.com",
 					},
+					{
+						Type:   dns.DomainMatchingType_Full,
+						Domain: "example.com",
+						Ip:     [][]byte{{127, 0, 0, 1}},
+					},
 					{
 						Type:   dns.DomainMatchingType_Full,
 						Domain: "example.com",
@@ -127,11 +132,6 @@ func TestDNSConfigParsing(t *testing.T) {
 						Domain: ".*\\.com",
 						Ip:     [][]byte{{8, 8, 4, 4}},
 					},
-					{
-						Type:   dns.DomainMatchingType_Full,
-						Domain: "example.com",
-						Ip:     [][]byte{{127, 0, 0, 1}},
-					},
 				},
 				ClientIp: []byte{10, 0, 0, 1},
 			},

infra/conf/fakedns.go

@@ -0,0 +1,66 @@
+package conf
+
+import (
+	"github.com/golang/protobuf/proto"
+	"github.com/xtls/xray-core/app/dns/fakedns"
+	"github.com/xtls/xray-core/features/dns"
+)
+
+type FakeDNSConfig struct {
+	IPPool  string `json:"ipPool"`
+	LruSize int64  `json:"poolSize"`
+}
+
+func (f FakeDNSConfig) Build() (proto.Message, error) {
+	return &fakedns.FakeDnsPool{
+		IpPool:  f.IPPool,
+		LruSize: f.LruSize,
+	}, nil
+}
+
+type FakeDNSPostProcessingStage struct{}
+
+func (FakeDNSPostProcessingStage) Process(conf *Config) error {
+	var fakeDNSInUse bool
+
+	if conf.DNSConfig != nil {
+		for _, v := range conf.DNSConfig.Servers {
+			if v.Address.Family().IsDomain() {
+				if v.Address.Domain() == "fakedns" {
+					fakeDNSInUse = true
+				}
+			}
+		}
+	}
+
+	if fakeDNSInUse {
+		if conf.FakeDNS == nil {
+			// Add a Fake DNS Config if there is none
+			conf.FakeDNS = &FakeDNSConfig{
+				IPPool:  dns.FakeIPPool,
+				LruSize: 65535,
+			}
+		}
+		found := false
+		// Check if there is a Outbound with necessary sniffer on
+		var inbounds []InboundDetourConfig
+
+		if len(conf.InboundConfigs) > 0 {
+			inbounds = append(inbounds, conf.InboundConfigs...)
+		}
+		for _, v := range inbounds {
+			if v.SniffingConfig != nil && v.SniffingConfig.Enabled && v.SniffingConfig.DestOverride != nil {
+				for _, dov := range *v.SniffingConfig.DestOverride {
+					if dov == "fakedns" {
+						found = true
+					}
+				}
+			}
+		}
+		if !found {
+			newError("Defined Fake DNS but haven't enabled fake dns sniffing at any inbound.").AtWarning().WriteToLog()
+		}
+	}
+
+	return nil
+}

infra/conf/grpc.go

@@ -0,0 +1,16 @@
+package conf
+
+import (
+	"github.com/golang/protobuf/proto"
+
+	"github.com/xtls/xray-core/transport/internet/grpc"
+)
+
+type GRPCConfig struct {
+	ServiceName string `json:"serviceName"`
+	MultiMode   bool   `json:"multiMode"`
+}
+
+func (g GRPCConfig) Build() (proto.Message, error) {
+	return &grpc.Config{ServiceName: g.ServiceName, MultiMode: g.MultiMode}, nil
+}

infra/conf/init.go

@@ -0,0 +1,5 @@
+package conf
+
+func init() {
+	RegisterConfigureFilePostProcessingStage("FakeDNS", &FakeDNSPostProcessingStage{})
+}

infra/conf/lint.go

@@ -0,0 +1,23 @@
+package conf
+
+type ConfigureFilePostProcessingStage interface {
+	Process(conf *Config) error
+}
+
+var configureFilePostProcessingStages map[string]ConfigureFilePostProcessingStage
+
+func RegisterConfigureFilePostProcessingStage(name string, stage ConfigureFilePostProcessingStage) {
+	if configureFilePostProcessingStages == nil {
+		configureFilePostProcessingStages = make(map[string]ConfigureFilePostProcessingStage)
+	}
+	configureFilePostProcessingStages[name] = stage
+}
+
+func PostProcessConfigureFile(conf *Config) error {
+	for k, v := range configureFilePostProcessingStages {
+		if err := v.Process(conf); err != nil {
+			return newError("Rejected by Postprocessing Stage ", k).AtError().Base(err)
+		}
+	}
+	return nil
+}

infra/conf/log.go

@@ -19,6 +19,7 @@ type LogConfig struct {
 	AccessLog string `json:"access"`
 	ErrorLog  string `json:"error"`
 	LogLevel  string `json:"loglevel"`
+	DNSLog    bool   `json:"dnsLog"`
 }
 
 func (v *LogConfig) Build() *log.Config {
@@ -28,6 +29,7 @@ func (v *LogConfig) Build() *log.Config {
 	config := &log.Config{
 		ErrorLogType:  log.LogType_Console,
 		AccessLogType: log.LogType_Console,
+		EnableDnsLog:  v.DNSLog,
 	}
 
 	if v.AccessLog == "none" {

infra/conf/serial/builder.go

@@ -0,0 +1,44 @@
+package serial
+
+import (
+	"github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/infra/conf"
+	"github.com/xtls/xray-core/main/confloader"
+	"io"
+)
+
+func BuildConfig(files []string, formats []string) (*core.Config, error) {
+
+	cf := &conf.Config{}
+	for i, file := range files {
+		newError("Reading config: ", file).AtInfo().WriteToLog()
+		r, err := confloader.LoadConfig(file)
+		if err != nil {
+			return nil, newError("failed to read config: ", file).Base(err)
+		}
+		c, err := ReaderDecoderByFormat[formats[i]](r)
+		if err != nil {
+			return nil, newError("failed to decode config: ", file).Base(err)
+		}
+		if i == 0 {
+			*cf = *c
+			continue
+		}
+		cf.Override(c, file)
+	}
+	return cf.Build()
+}
+
+type readerDecoder func(io.Reader) (*conf.Config, error)
+
+var (
+	ReaderDecoderByFormat = make(map[string]readerDecoder)
+)
+
+func init() {
+	ReaderDecoderByFormat["json"] = DecodeJSONConfig
+	ReaderDecoderByFormat["yaml"] = DecodeYAMLConfig
+	ReaderDecoderByFormat["toml"] = DecodeTOMLConfig
+
+	core.ConfigBuilderForFiles = BuildConfig
+}

infra/conf/transport.go

@@ -2,7 +2,7 @@ package conf
 
 import (
 	"github.com/xtls/xray-core/common/serial"
-	"github.com/xtls/xray-core/transport"
+	"github.com/xtls/xray-core/transport/global"
 	"github.com/xtls/xray-core/transport/internet"
 )
 
@@ -13,11 +13,13 @@ type TransportConfig struct {
 	HTTPConfig *HTTPConfig         `json:"httpSettings"`
 	DSConfig   *DomainSocketConfig `json:"dsSettings"`
 	QUICConfig *QUICConfig         `json:"quicSettings"`
+	GRPCConfig *GRPCConfig         `json:"grpcSettings"`
+	GUNConfig  *GRPCConfig         `json:"gunSettings"`
 }
 
 // Build implements Buildable.
-func (c *TransportConfig) Build() (*transport.Config, error) {
-	config := new(transport.Config)
+func (c *TransportConfig) Build() (*global.Config, error) {
+	config := new(global.Config)
 
 	if c.TCPConfig != nil {
 		ts, err := c.TCPConfig.Build()
@@ -85,5 +87,19 @@ func (c *TransportConfig) Build() (*transport.Config, error) {
 		})
 	}
 
+	if c.GRPCConfig == nil {
+		c.GRPCConfig = c.GUNConfig
+	}
+	if c.GRPCConfig != nil {
+		gs, err := c.GRPCConfig.Build()
+		if err != nil {
+			return nil, newError("Failed to build gRPC config.").Base(err)
+		}
+		config.TransportSettings = append(config.TransportSettings, &internet.TransportConfig{
+			ProtocolName: "grpc",
+			Settings:     serial.ToTypedMessage(gs),
+		})
+	}
+
 	return config, nil
 }

infra/conf/transport_internet.go

@@ -2,6 +2,9 @@ package conf
 
 import (
 	"encoding/json"
+	"math"
+	"net/url"
+	"strconv"
 	"strings"
 
 	"github.com/golang/protobuf/proto"
@@ -154,9 +157,20 @@ func (c *WebSocketConfig) Build() (proto.Message, error) {
 			Value: value,
 		})
 	}
+	var ed uint32
+	if u, err := url.Parse(path); err == nil {
+		if q := u.Query(); q.Get("ed") != "" {
+			Ed, _ := strconv.Atoi(q.Get("ed"))
+			ed = uint32(Ed)
+			q.Del("ed")
+			u.RawQuery = q.Encode()
+			path = u.String()
+		}
+	}
 	config := &websocket.Config{
 		Path:   path,
 		Header: header,
+		Ed:     ed,
 	}
 	if c.AcceptProxyProtocol {
 		config.AcceptProxyProtocol = c.AcceptProxyProtocol
@@ -247,12 +261,13 @@ func readFileOrString(f string, s []string) ([]byte, error) {
 }
 
 type TLSCertConfig struct {
-	CertFile     string   `json:"certificateFile"`
-	CertStr      []string `json:"certificate"`
-	KeyFile      string   `json:"keyFile"`
-	KeyStr       []string `json:"key"`
-	Usage        string   `json:"usage"`
-	OcspStapling int64    `json:"ocspStapling"`
+	CertFile       string   `json:"certificateFile"`
+	CertStr        []string `json:"certificate"`
+	KeyFile        string   `json:"keyFile"`
+	KeyStr         []string `json:"key"`
+	Usage          string   `json:"usage"`
+	OcspStapling   uint64   `json:"ocspStapling"`
+	OneTimeLoading bool     `json:"oneTimeLoading"`
 }
 
 // Build implements Buildable.
@@ -264,6 +279,7 @@ func (c *TLSCertConfig) Build() (*tls.Certificate, error) {
 		return nil, newError("failed to parse certificate").Base(err)
 	}
 	certificate.Certificate = cert
+	certificate.CertificatePath = c.CertFile
 
 	if len(c.KeyFile) > 0 || len(c.KeyStr) > 0 {
 		key, err := readFileOrString(c.KeyFile, c.KeyStr)
@@ -271,6 +287,7 @@ func (c *TLSCertConfig) Build() (*tls.Certificate, error) {
 			return nil, newError("failed to parse key").Base(err)
 		}
 		certificate.Key = key
+		certificate.KeyPath = c.KeyFile
 	}
 
 	switch strings.ToLower(c.Usage) {
@@ -283,7 +300,11 @@ func (c *TLSCertConfig) Build() (*tls.Certificate, error) {
 	default:
 		certificate.Usage = tls.Certificate_ENCIPHERMENT
 	}
-
+	if certificate.KeyPath == "" && certificate.CertificatePath == "" {
+		certificate.OneTimeLoading = true
+	} else {
+		certificate.OneTimeLoading = c.OneTimeLoading
+	}
 	certificate.OcspStapling = c.OcspStapling
 
 	return certificate, nil
@@ -331,23 +352,24 @@ func (c *TLSConfig) Build() (proto.Message, error) {
 }
 
 type XTLSCertConfig struct {
-	CertFile     string   `json:"certificateFile"`
-	CertStr      []string `json:"certificate"`
-	KeyFile      string   `json:"keyFile"`
-	KeyStr       []string `json:"key"`
-	Usage        string   `json:"usage"`
-	OcspStapling int64    `json:"ocspStapling"`
+	CertFile       string   `json:"certificateFile"`
+	CertStr        []string `json:"certificate"`
+	KeyFile        string   `json:"keyFile"`
+	KeyStr         []string `json:"key"`
+	Usage          string   `json:"usage"`
+	OcspStapling   uint64   `json:"ocspStapling"`
+	OneTimeLoading bool     `json:"oneTimeLoading"`
 }
 
 // Build implements Buildable.
 func (c *XTLSCertConfig) Build() (*xtls.Certificate, error) {
 	certificate := new(xtls.Certificate)
-
 	cert, err := readFileOrString(c.CertFile, c.CertStr)
 	if err != nil {
 		return nil, newError("failed to parse certificate").Base(err)
 	}
 	certificate.Certificate = cert
+	certificate.CertificatePath = c.CertFile
 
 	if len(c.KeyFile) > 0 || len(c.KeyStr) > 0 {
 		key, err := readFileOrString(c.KeyFile, c.KeyStr)
@@ -355,6 +377,7 @@ func (c *XTLSCertConfig) Build() (*xtls.Certificate, error) {
 			return nil, newError("failed to parse key").Base(err)
 		}
 		certificate.Key = key
+		certificate.KeyPath = c.KeyFile
 	}
 
 	switch strings.ToLower(c.Usage) {
@@ -367,7 +390,11 @@ func (c *XTLSCertConfig) Build() (*xtls.Certificate, error) {
 	default:
 		certificate.Usage = xtls.Certificate_ENCIPHERMENT
 	}
-
+	if certificate.KeyPath == "" && certificate.CertificatePath == "" {
+		certificate.OneTimeLoading = true
+	} else {
+		certificate.OneTimeLoading = c.OneTimeLoading
+	}
 	certificate.OcspStapling = c.OcspStapling
 
 	return certificate, nil
@@ -431,26 +458,40 @@ func (p TransportProtocol) Build() (string, error) {
 		return "domainsocket", nil
 	case "quic":
 		return "quic", nil
+	case "grpc", "gun":
+		return "grpc", nil
 	default:
 		return "", newError("Config: unknown transport protocol: ", p)
 	}
 }
 
 type SocketConfig struct {
-	Mark                int32  `json:"mark"`
-	TFO                 *bool  `json:"tcpFastOpen"`
-	TProxy              string `json:"tproxy"`
-	AcceptProxyProtocol bool   `json:"acceptProxyProtocol"`
+	Mark                int32       `json:"mark"`
+	TFO                 interface{} `json:"tcpFastOpen"`
+	TProxy              string      `json:"tproxy"`
+	AcceptProxyProtocol bool        `json:"acceptProxyProtocol"`
+	DomainStrategy      string      `json:"domainStrategy"`
+	DialerProxy         string      `json:"dialerProxy"`
 }
 
 // Build implements Buildable.
 func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
-	var tfoSettings internet.SocketConfig_TCPFastOpenState
+	tfo := int32(-1)
 	if c.TFO != nil {
-		if *c.TFO {
-			tfoSettings = internet.SocketConfig_Enable
-		} else {
-			tfoSettings = internet.SocketConfig_Disable
+		switch v := c.TFO.(type) {
+		case bool:
+			if v {
+				tfo = 256
+			} else {
+				tfo = 0
+			}
+		case float64:
+			if v < 0 {
+				return nil, newError("tcpFastOpen: only boolean and non-negative integer value is acceptable")
+			}
+			tfo = int32(math.Min(v, math.MaxInt32))
+		default:
+			return nil, newError("tcpFastOpen: only boolean and non-negative integer value is acceptable")
 		}
 	}
 	var tproxy internet.SocketConfig_TProxyMode
@@ -463,11 +504,23 @@ func (c *SocketConfig) Build() (*internet.SocketConfig, error) {
 		tproxy = internet.SocketConfig_Off
 	}
 
+	var dStrategy = internet.DomainStrategy_AS_IS
+	switch strings.ToLower(c.DomainStrategy) {
+	case "useip", "use_ip":
+		dStrategy = internet.DomainStrategy_USE_IP
+	case "useip4", "useipv4", "use_ipv4", "use_ip_v4", "use_ip4":
+		dStrategy = internet.DomainStrategy_USE_IP4
+	case "useip6", "useipv6", "use_ipv6", "use_ip_v6", "use_ip6":
+		dStrategy = internet.DomainStrategy_USE_IP6
+	}
+
 	return &internet.SocketConfig{
 		Mark:                c.Mark,
-		Tfo:                 tfoSettings,
+		Tfo:                 tfo,
 		Tproxy:              tproxy,
+		DomainStrategy:      dStrategy,
 		AcceptProxyProtocol: c.AcceptProxyProtocol,
+		DialerProxy:         c.DialerProxy,
 	}, nil
 }
 
@@ -483,6 +536,8 @@ type StreamConfig struct {
 	DSSettings     *DomainSocketConfig `json:"dsSettings"`
 	QUICSettings   *QUICConfig         `json:"quicSettings"`
 	SocketSettings *SocketConfig       `json:"sockopt"`
+	GRPCConfig     *GRPCConfig         `json:"grpcSettings"`
+	GUNConfig      *GRPCConfig         `json:"gunSettings"`
 }
 
 // Build implements Buildable.
@@ -592,6 +647,19 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 			Settings:     serial.ToTypedMessage(qs),
 		})
 	}
+	if c.GRPCConfig == nil {
+		c.GRPCConfig = c.GUNConfig
+	}
+	if c.GRPCConfig != nil {
+		gs, err := c.GRPCConfig.Build()
+		if err != nil {
+			return nil, newError("Failed to build gRPC config.").Base(err)
+		}
+		config.TransportSettings = append(config.TransportSettings, &internet.TransportConfig{
+			ProtocolName: "grpc",
+			Settings:     serial.ToTypedMessage(gs),
+		})
+	}
 	if c.SocketSettings != nil {
 		ss, err := c.SocketSettings.Build()
 		if err != nil {
@@ -604,6 +672,9 @@ func (c *StreamConfig) Build() (*internet.StreamConfig, error) {
 
 type ProxyConfig struct {
 	Tag string `json:"tag"`
+
+	// TransportLayerProxy: For compatibility.
+	TransportLayerProxy bool `json:"transportLayer"`
 }
 
 // Build implements Buildable.
@@ -612,6 +683,7 @@ func (v *ProxyConfig) Build() (*internet.ProxyConfig, error) {
 		return nil, newError("Proxy tag is not set.")
 	}
 	return &internet.ProxyConfig{
-		Tag: v.Tag,
+		Tag:                 v.Tag,
+		TransportLayerProxy: v.TransportLayerProxy,
 	}, nil
 }

infra/conf/transport_test.go

@@ -8,8 +8,9 @@ import (
 	"github.com/xtls/xray-core/common/protocol"
 	"github.com/xtls/xray-core/common/serial"
 	. "github.com/xtls/xray-core/infra/conf"
-	"github.com/xtls/xray-core/transport"
+	"github.com/xtls/xray-core/transport/global"
 	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/grpc"
 	"github.com/xtls/xray-core/transport/internet/headers/http"
 	"github.com/xtls/xray-core/transport/internet/headers/noop"
 	"github.com/xtls/xray-core/transport/internet/headers/tls"
@@ -34,12 +35,40 @@ func TestSocketConfig(t *testing.T) {
 		{
 			Input: `{
 				"mark": 1,
-				"tcpFastOpen": true
+				"tcpFastOpen": true,
+				"domainStrategy": "UseIP",
+				"dialerProxy": "tag"
 			}`,
 			Parser: createParser(),
 			Output: &internet.SocketConfig{
-				Mark: 1,
-				Tfo:  internet.SocketConfig_Enable,
+				Mark:           1,
+				Tfo:            256,
+				DomainStrategy: internet.DomainStrategy_USE_IP,
+				DialerProxy:    "tag",
+			},
+		},
+	})
+	runMultiTestCase(t, []TestCase{
+		{
+			Input: `{
+				"tcpFastOpen": false
+			}`,
+			Parser: createParser(),
+			Output: &internet.SocketConfig{
+				Mark: 0,
+				Tfo:  0,
+			},
+		},
+	})
+	runMultiTestCase(t, []TestCase{
+		{
+			Input: `{
+				"tcpFastOpen": 65535
+			}`,
+			Parser: createParser(),
+			Output: &internet.SocketConfig{
+				Mark: 0,
+				Tfo:  65535,
 			},
 		},
 	})
@@ -92,10 +121,14 @@ func TestTransportConfig(t *testing.T) {
 					"header": {
 						"type": "dtls"
 					}
+				},
+				"grpcSettings": {
+					"serviceName": "name",
+					"multiMode": true
 				}
 			}`,
 			Parser: createParser(),
-			Output: &transport.Config{
+			Output: &global.Config{
 				TransportSettings: []*internet.TransportConfig{
 					{
 						ProtocolName: "tcp",
@@ -162,6 +195,31 @@ func TestTransportConfig(t *testing.T) {
 							Header: serial.ToTypedMessage(&tls.PacketConfig{}),
 						}),
 					},
+					{
+						ProtocolName: "grpc",
+						Settings: serial.ToTypedMessage(&grpc.Config{
+							ServiceName: "name",
+							MultiMode:   true,
+						}),
+					},
+				},
+			},
+		},
+		{
+			Input: `{
+				"gunSettings": {
+					"serviceName": "name"
+				}
+			}`,
+			Parser: createParser(),
+			Output: &global.Config{
+				TransportSettings: []*internet.TransportConfig{
+					{
+						ProtocolName: "grpc",
+						Settings: serial.ToTypedMessage(&grpc.Config{
+							ServiceName: "name",
+						}),
+					},
 				},
 			},
 		},

infra/conf/trojan.go

@@ -104,7 +104,7 @@ type TrojanUserConfig struct {
 // TrojanServerConfig is Inbound configuration
 type TrojanServerConfig struct {
 	Clients   []*TrojanUserConfig      `json:"clients"`
-	Fallback  json.RawMessage          `json:"fallback"`
+	Fallback  *TrojanInboundFallback   `json:"fallback"`
 	Fallbacks []*TrojanInboundFallback `json:"fallbacks"`
 }
 

infra/conf/vless.go

@@ -29,7 +29,7 @@ type VLessInboundFallback struct {
 type VLessInboundConfig struct {
 	Clients    []json.RawMessage       `json:"clients"`
 	Decryption string                  `json:"decryption"`
-	Fallback   json.RawMessage         `json:"fallback"`
+	Fallback   *VLessInboundFallback   `json:"fallback"`
 	Fallbacks  []*VLessInboundFallback `json:"fallbacks"`
 }
 

infra/conf/vmess.go

@@ -32,6 +32,8 @@ func (a *VMessAccount) Build() *vmess.Account {
 		st = protocol.SecurityType_AUTO
 	case "none":
 		st = protocol.SecurityType_NONE
+	case "zero":
+		st = protocol.SecurityType_ZERO
 	default:
 		st = protocol.SecurityType_AUTO
 	}

infra/conf/xray.go

@@ -2,6 +2,7 @@ package conf
 
 import (
 	"encoding/json"
+	"github.com/xtls/xray-core/transport/internet"
 	"log"
 	"os"
 	"strings"
@@ -61,6 +62,7 @@ type SniffingConfig struct {
 	Enabled         bool        `json:"enabled"`
 	DestOverride    *StringList `json:"destOverride"`
 	DomainsExcluded *StringList `json:"domainsExcluded"`
+	MetadataOnly    bool        `json:"metadataOnly"`
 }
 
 // Build implements Buildable.
@@ -73,6 +75,8 @@ func (c *SniffingConfig) Build() (*proxyman.SniffingConfig, error) {
 				p = append(p, "http")
 			case "tls", "https", "ssl":
 				p = append(p, "tls")
+			case "fakedns":
+				p = append(p, "fakedns")
 			default:
 				return nil, newError("unknown protocol: ", protocol)
 			}
@@ -90,6 +94,7 @@ func (c *SniffingConfig) Build() (*proxyman.SniffingConfig, error) {
 		Enabled:             c.Enabled,
 		DestinationOverride: p,
 		DomainsExcluded:     d,
+		MetadataOnly:        c.MetadataOnly,
 	}, nil
 }
 
@@ -267,9 +272,22 @@ type OutboundDetourConfig struct {
 	MuxSettings   *MuxConfig       `json:"mux"`
 }
 
+func (c *OutboundDetourConfig) checkChainProxyConfig() error {
+	if c.StreamSetting == nil || c.ProxySettings == nil || c.StreamSetting.SocketSettings == nil {
+		return nil
+	}
+	if len(c.ProxySettings.Tag) > 0 && len(c.StreamSetting.SocketSettings.DialerProxy) > 0 {
+		return newError("proxySettings.tag is conflicted with sockopt.dialerProxy").AtWarning()
+	}
+	return nil
+}
+
 // Build implements Buildable.
 func (c *OutboundDetourConfig) Build() (*core.OutboundHandlerConfig, error) {
 	senderSettings := &proxyman.SenderConfig{}
+	if err := c.checkChainProxyConfig(); err != nil {
+		return nil, err
+	}
 
 	if c.SendThrough != nil {
 		address := c.SendThrough
@@ -295,6 +313,18 @@ func (c *OutboundDetourConfig) Build() (*core.OutboundHandlerConfig, error) {
 		if err != nil {
 			return nil, newError("invalid outbound detour proxy settings.").Base(err)
 		}
+		if ps.TransportLayerProxy {
+			if senderSettings.StreamSettings != nil {
+				if senderSettings.StreamSettings.SocketSettings != nil {
+					senderSettings.StreamSettings.SocketSettings.DialerProxy = ps.Tag
+				} else {
+					senderSettings.StreamSettings.SocketSettings = &internet.SocketConfig{DialerProxy: ps.Tag}
+				}
+			} else {
+				senderSettings.StreamSettings = &internet.StreamConfig{SocketSettings: &internet.SocketConfig{DialerProxy: ps.Tag}}
+			}
+			ps = nil
+		}
 		senderSettings.ProxySettings = ps
 	}
 
@@ -369,6 +399,7 @@ type Config struct {
 	API             *APIConfig             `json:"api"`
 	Stats           *StatsConfig           `json:"stats"`
 	Reverse         *ReverseConfig         `json:"reverse"`
+	FakeDNS         *FakeDNSConfig         `json:"fakeDns"`
 }
 
 func (c *Config) findInboundTag(tag string) int {
@@ -422,6 +453,10 @@ func (c *Config) Override(o *Config, fn string) {
 		c.Reverse = o.Reverse
 	}
 
+	if o.FakeDNS != nil {
+		c.FakeDNS = o.FakeDNS
+	}
+
 	// deprecated attrs... keep them for now
 	if o.InboundConfig != nil {
 		c.InboundConfig = o.InboundConfig
@@ -493,6 +528,10 @@ func applyTransportConfig(s *StreamConfig, t *TransportConfig) {
 
 // Build implements Buildable.
 func (c *Config) Build() (*core.Config, error) {
+	if err := PostProcessConfigureFile(c); err != nil {
+		return nil, err
+	}
+
 	config := &core.Config{
 		App: []*serial.TypedMessage{
 			serial.ToTypedMessage(&dispatcher.Config{}),
@@ -559,6 +598,14 @@ func (c *Config) Build() (*core.Config, error) {
 		config.App = append(config.App, serial.ToTypedMessage(r))
 	}
 
+	if c.FakeDNS != nil {
+		r, err := c.FakeDNS.Build()
+		if err != nil {
+			return nil, err
+		}
+		config.App = append(config.App, serial.ToTypedMessage(r))
+	}
+
 	var inbounds []InboundDetourConfig
 
 	if c.InboundConfig != nil {

main/distro/all/all.go

@@ -16,6 +16,7 @@ import (
 
 	// Other optional features.
 	_ "github.com/xtls/xray-core/app/dns"
+	_ "github.com/xtls/xray-core/app/dns/fakedns"
 	_ "github.com/xtls/xray-core/app/log"
 	_ "github.com/xtls/xray-core/app/policy"
 	_ "github.com/xtls/xray-core/app/reverse"
@@ -39,6 +40,7 @@ import (
 
 	// Transports
 	_ "github.com/xtls/xray-core/transport/internet/domainsocket"
+	_ "github.com/xtls/xray-core/transport/internet/grpc"
 	_ "github.com/xtls/xray-core/transport/internet/http"
 	_ "github.com/xtls/xray-core/transport/internet/kcp"
 	_ "github.com/xtls/xray-core/transport/internet/quic"

main/run.go

@@ -11,13 +11,11 @@ import (
 	"regexp"
 	"runtime"
 	"runtime/debug"
-	"strings"
 	"syscall"
 
 	"github.com/xtls/xray-core/common/cmdarg"
 	"github.com/xtls/xray-core/common/platform"
 	"github.com/xtls/xray-core/core"
-	"github.com/xtls/xray-core/infra/conf"
 	"github.com/xtls/xray-core/main/commands/base"
 )
 
@@ -83,9 +81,11 @@ func executeRun(cmd *base.Command, args []string) {
 	}
 	defer server.Close()
 
-	conf.FileCache = nil
-	conf.IPCache = nil
-	conf.SiteCache = nil
+	/*
+		conf.FileCache = nil
+		conf.IPCache = nil
+		conf.SiteCache = nil
+	*/
 
 	// Explicitly triggering GC to remove garbage from config loading.
 	runtime.GC()
@@ -158,30 +158,25 @@ func getConfigFilePath() cmdarg.Arg {
 }
 
 func getConfigFormat() string {
-	switch strings.ToLower(*format) {
-	case "pb", "protobuf":
-		return "protobuf"
-	case "yaml", "yml":
-		return "yaml"
-	case "toml":
-		return "toml"
-	default:
-		return "json"
+	f := core.GetFormatByExtension(*format)
+	if f == "" {
+		f = "json"
 	}
+	return f
 }
 
 func startXray() (core.Server, error) {
 	configFiles := getConfigFilePath()
 
-	config, err := core.LoadConfig(getConfigFormat(), configFiles[0], configFiles)
+	//config, err := core.LoadConfig(getConfigFormat(), configFiles[0], configFiles)
 
-	//config, err := core.LoadConfigs(getConfigFormat(), configFiles)
+	c, err := core.LoadConfig(getConfigFormat(), configFiles)
 
 	if err != nil {
 		return nil, newError("failed to load config files: [", configFiles.String(), "]").Base(err)
 	}
 
-	server, err := core.New(config)
+	server, err := core.New(c)
 	if err != nil {
 		return nil, newError("failed to create server").Base(err)
 	}

proxy/dns/dns.go

@@ -36,25 +36,13 @@ type ownLinkVerifier interface {
 }
 
 type Handler struct {
-	ipv4Lookup      dns.IPv4Lookup
-	ipv6Lookup      dns.IPv6Lookup
+	client          dns.Client
 	ownLinkVerifier ownLinkVerifier
 	server          net.Destination
 }
 
 func (h *Handler) Init(config *Config, dnsClient dns.Client) error {
-	ipv4lookup, ok := dnsClient.(dns.IPv4Lookup)
-	if !ok {
-		return newError("dns.Client doesn't implement IPv4Lookup")
-	}
-	h.ipv4Lookup = ipv4lookup
-
-	ipv6lookup, ok := dnsClient.(dns.IPv6Lookup)
-	if !ok {
-		return newError("dns.Client doesn't implement IPv6Lookup")
-	}
-	h.ipv6Lookup = ipv6lookup
-
+	h.client = dnsClient
 	if v, ok := dnsClient.(ownLinkVerifier); ok {
 		h.ownLinkVerifier = v
 	}
@@ -209,11 +197,21 @@ func (h *Handler) handleIPQuery(id uint16, qType dnsmessage.Type, domain string,
 	var ips []net.IP
 	var err error
 
+	var ttl uint32 = 600
+
 	switch qType {
 	case dnsmessage.TypeA:
-		ips, err = h.ipv4Lookup.LookupIPv4(domain)
+		ips, err = h.client.LookupIP(domain, dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: false,
+			FakeEnable: true,
+		})
 	case dnsmessage.TypeAAAA:
-		ips, err = h.ipv6Lookup.LookupIPv6(domain)
+		ips, err = h.client.LookupIP(domain, dns.IPOption{
+			IPv4Enable: false,
+			IPv6Enable: true,
+			FakeEnable: true,
+		})
 	}
 
 	rcode := dns.RCodeFromError(err)
@@ -241,7 +239,7 @@ func (h *Handler) handleIPQuery(id uint16, qType dnsmessage.Type, domain string,
 	}))
 	common.Must(builder.StartAnswers())
 
-	rHeader := dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName(domain), Class: dnsmessage.ClassINET, TTL: 600}
+	rHeader := dnsmessage.ResourceHeader{Name: dnsmessage.MustNewName(domain), Class: dnsmessage.ClassINET, TTL: ttl}
 	for _, ip := range ips {
 		if len(ip) == net.IPv4len {
 			var r dnsmessage.AResource

proxy/freedom/freedom.go

@@ -59,19 +59,26 @@ func (h *Handler) policy() policy.Session {
 }
 
 func (h *Handler) resolveIP(ctx context.Context, domain string, localAddr net.Address) net.Address {
-	var lookupFunc func(string) ([]net.IP, error) = h.dns.LookupIP
-
+	var option dns.IPOption = dns.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+		FakeEnable: false,
+	}
 	if h.config.DomainStrategy == Config_USE_IP4 || (localAddr != nil && localAddr.Family().IsIPv4()) {
-		if lookupIPv4, ok := h.dns.(dns.IPv4Lookup); ok {
-			lookupFunc = lookupIPv4.LookupIPv4
+		option = dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: false,
+			FakeEnable: false,
 		}
 	} else if h.config.DomainStrategy == Config_USE_IP6 || (localAddr != nil && localAddr.Family().IsIPv6()) {
-		if lookupIPv6, ok := h.dns.(dns.IPv6Lookup); ok {
-			lookupFunc = lookupIPv6.LookupIPv6
+		option = dns.IPOption{
+			IPv4Enable: false,
+			IPv6Enable: true,
+			FakeEnable: false,
 		}
 	}
 
-	ips, err := lookupFunc(domain)
+	ips, err := h.dns.LookupIP(domain, option)
 	if err != nil {
 		newError("failed to get IP address for domain ", domain).Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
@@ -97,13 +104,16 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		return newError("target not specified.")
 	}
 	destination := outbound.Target
+	UDPOverride := net.UDPDestination(nil, 0)
 	if h.config.DestinationOverride != nil {
 		server := h.config.DestinationOverride.Server
 		if isValidAddress(server.Address) {
 			destination.Address = server.Address.AsAddress()
+			UDPOverride.Address = destination.Address
 		}
 		if server.Port != 0 {
 			destination.Port = net.Port(server.Port)
+			UDPOverride.Port = destination.Port
 		}
 	}
 	newError("opening connection to ", destination).WriteToLog(session.ExportIDToError(ctx))
@@ -122,7 +132,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 					Address: ip,
 					Port:    dialDest.Port,
 				}
-				newError("dialing to to ", dialDest).WriteToLog(session.ExportIDToError(ctx))
+				newError("dialing to ", dialDest).WriteToLog(session.ExportIDToError(ctx))
 			}
 		}
 
@@ -149,7 +159,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		if destination.Network == net.Network_TCP {
 			writer = buf.NewWriter(conn)
 		} else {
-			writer = NewPacketWriter(conn, h, ctx)
+			writer = NewPacketWriter(conn, h, ctx, UDPOverride)
 		}
 
 		if err := buf.Copy(input, writer, buf.UpdateActivity(timer)); err != nil {
@@ -166,7 +176,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		if destination.Network == net.Network_TCP {
 			reader = buf.NewReader(conn)
 		} else {
-			reader = NewPacketReader(conn)
+			reader = NewPacketReader(conn, UDPOverride)
 		}
 		if err := buf.Copy(reader, output, buf.UpdateActivity(timer)); err != nil {
 			return newError("failed to process response").Base(err)
@@ -182,7 +192,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	return nil
 }
 
-func NewPacketReader(conn net.Conn) buf.Reader {
+func NewPacketReader(conn net.Conn, UDPOverride net.Destination) buf.Reader {
 	iConn := conn
 	statConn, ok := iConn.(*internet.StatCouterConnection)
 	if ok {
@@ -192,7 +202,7 @@ func NewPacketReader(conn net.Conn) buf.Reader {
 	if statConn != nil {
 		counter = statConn.ReadCounter
 	}
-	if c, ok := iConn.(*internet.PacketConnWrapper); ok {
+	if c, ok := iConn.(*internet.PacketConnWrapper); ok && UDPOverride.Address == nil && UDPOverride.Port == 0 {
 		return &PacketReader{
 			PacketConnWrapper: c,
 			Counter:           counter,
@@ -226,7 +236,7 @@ func (r *PacketReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 	return buf.MultiBuffer{b}, nil
 }
 
-func NewPacketWriter(conn net.Conn, h *Handler, ctx context.Context) buf.Writer {
+func NewPacketWriter(conn net.Conn, h *Handler, ctx context.Context, UDPOverride net.Destination) buf.Writer {
 	iConn := conn
 	statConn, ok := iConn.(*internet.StatCouterConnection)
 	if ok {
@@ -242,6 +252,7 @@ func NewPacketWriter(conn net.Conn, h *Handler, ctx context.Context) buf.Writer
 			Counter:           counter,
 			Handler:           h,
 			Context:           ctx,
+			UDPOverride:       UDPOverride,
 		}
 	}
 	return &buf.SequentialWriter{Writer: conn}
@@ -252,6 +263,7 @@ type PacketWriter struct {
 	stats.Counter
 	*Handler
 	context.Context
+	UDPOverride net.Destination
 }
 
 func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
@@ -264,6 +276,12 @@ func (w *PacketWriter) WriteMultiBuffer(mb buf.MultiBuffer) error {
 		var n int
 		var err error
 		if b.UDP != nil {
+			if w.UDPOverride.Address != nil {
+				b.UDP.Address = w.UDPOverride.Address
+			}
+			if w.UDPOverride.Port != 0 {
+				b.UDP.Port = w.UDPOverride.Port
+			}
 			if w.Handler.config.useIP() && b.UDP.Address.Family().IsDomain() {
 				ip := w.Handler.resolveIP(w.Context, b.UDP.Address.Domain(), nil)
 				if ip != nil {

proxy/shadowsocks/config.go

@@ -7,6 +7,8 @@ import (
 	"crypto/md5"
 	"crypto/sha1"
 	"io"
+	"reflect"
+	"strconv"
 
 	"golang.org/x/crypto/chacha20poly1305"
 	"golang.org/x/crypto/hkdf"
@@ -31,6 +33,31 @@ func (a *MemoryAccount) Equals(another protocol.Account) bool {
 	return false
 }
 
+func (a *MemoryAccount) GetCipherName() string {
+	switch a.Cipher.(type) {
+	case *AesCfb:
+		keyBytes := a.Cipher.(*AesCfb).KeyBytes
+		return "AES_" + strconv.FormatInt(int64(keyBytes*8), 10) + "_CFB"
+	case *ChaCha20:
+		if a.Cipher.(*ChaCha20).IVBytes == 8 {
+			return "CHACHA20"
+		}
+		return "CHACHA20_IETF"
+	case *AEADCipher:
+		switch reflect.ValueOf(a.Cipher.(*AEADCipher).AEADAuthCreator).Pointer() {
+		case reflect.ValueOf(createAesGcm).Pointer():
+			keyBytes := a.Cipher.(*AEADCipher).KeyBytes
+			return "AES_" + strconv.FormatInt(int64(keyBytes*8), 10) + "_GCM"
+		case reflect.ValueOf(createChacha20Poly1305).Pointer():
+			return "CHACHA20_POLY1305"
+		}
+	case *NoneCipher:
+		return "NONE"
+	}
+
+	return ""
+}
+
 func createAesGcm(key []byte) cipher.AEAD {
 	block, err := aes.NewCipher(key)
 	common.Must(err)

proxy/shadowsocks/protocol.go

@@ -54,12 +54,9 @@ func (r *FullReader) Read(p []byte) (n int, err error) {
 }
 
 // ReadTCPSession reads a Shadowsocks TCP session from the given reader, returns its header and remaining parts.
-func ReadTCPSession(users []*protocol.MemoryUser, reader io.Reader) (*protocol.RequestHeader, buf.Reader, error) {
-	user := users[0]
-	account := user.Account.(*MemoryAccount)
+func ReadTCPSession(validator *Validator, reader io.Reader) (*protocol.RequestHeader, buf.Reader, error) {
 
 	hashkdf := hmac.New(sha256.New, []byte("SSBSKDF"))
-	hashkdf.Write(account.Key)
 
 	behaviorSeed := crc32.ChecksumIEEE(hashkdf.Sum(nil))
 
@@ -71,10 +68,20 @@ func ReadTCPSession(users []*protocol.MemoryUser, reader io.Reader) (*protocol.R
 	readSizeRemain := DrainSize
 
 	var r2 buf.Reader
+	buffer := buf.New()
+	defer buffer.Release()
 
-	if len(users) > 1 {
-		buffer := buf.New()
-		defer buffer.Release()
+	var user *protocol.MemoryUser
+	var ivLen int32
+	var err error
+
+	count := validator.Count()
+	if count == 0 {
+		readSizeRemain -= int(buffer.Len())
+		DrainConnN(reader, readSizeRemain)
+		return nil, nil, newError("invalid user")
+	} else if count > 1 {
+		var aead cipher.AEAD
 
 		if _, err := buffer.ReadFullFrom(reader, 50); err != nil {
 			readSizeRemain -= int(buffer.Len())
@@ -83,45 +90,26 @@ func ReadTCPSession(users []*protocol.MemoryUser, reader io.Reader) (*protocol.R
 		}
 
 		bs := buffer.Bytes()
+		user, aead, _, ivLen, err = validator.Get(bs, protocol.RequestCommandTCP)
 
-		var aeadCipher *AEADCipher
-		var ivLen int32
-		subkey := make([]byte, 32)
-		length := make([]byte, 16)
-		var aead cipher.AEAD
-		var err error
-		for _, user = range users {
-			account = user.Account.(*MemoryAccount)
-			aeadCipher = account.Cipher.(*AEADCipher)
-			ivLen = aeadCipher.IVSize()
-			subkey = subkey[:aeadCipher.KeyBytes]
-			hkdfSHA1(account.Key, bs[:ivLen], subkey)
-			aead = aeadCipher.AEADAuthCreator(subkey)
-			_, err = aead.Open(length[:0], length[4:16], bs[ivLen:ivLen+18], nil)
-			if err == nil {
-				reader = &FullReader{reader, bs[ivLen:]}
-				auth := &crypto.AEADAuthenticator{
-					AEAD:           aead,
-					NonceGenerator: crypto.GenerateInitialAEADNonce(),
-				}
-				r2 = crypto.NewAuthenticationReader(auth, &crypto.AEADChunkSizeParser{
-					Auth: auth,
-				}, reader, protocol.TransferTypeStream, nil)
-				break
+		if user != nil {
+			reader = &FullReader{reader, bs[ivLen:]}
+			auth := &crypto.AEADAuthenticator{
+				AEAD:           aead,
+				NonceGenerator: crypto.GenerateInitialAEADNonce(),
 			}
-		}
-		if err != nil {
+			r2 = crypto.NewAuthenticationReader(auth, &crypto.AEADChunkSizeParser{
+				Auth: auth,
+			}, reader, protocol.TransferTypeStream, nil)
+		} else {
 			readSizeRemain -= int(buffer.Len())
 			DrainConnN(reader, readSizeRemain)
 			return nil, nil, newError("failed to match an user").Base(err)
 		}
-	}
-
-	buffer := buf.New()
-	defer buffer.Release()
-
-	if r2 == nil {
-		ivLen := account.Cipher.IVSize()
+	} else {
+		user, ivLen = validator.GetOnlyUser()
+		account := user.Account.(*MemoryAccount)
+		hashkdf.Write(account.Key)
 		var iv []byte
 		if ivLen > 0 {
 			if _, err := buffer.ReadFullFrom(reader, ivLen); err != nil {
@@ -261,40 +249,31 @@ func EncodeUDPPacket(request *protocol.RequestHeader, payload []byte) (*buf.Buff
 	return buffer, nil
 }
 
-func DecodeUDPPacket(users []*protocol.MemoryUser, payload *buf.Buffer) (*protocol.RequestHeader, *buf.Buffer, error) {
+func DecodeUDPPacket(validator *Validator, payload *buf.Buffer) (*protocol.RequestHeader, *buf.Buffer, error) {
+	bs := payload.Bytes()
+	if len(bs) <= 32 {
+		return nil, nil, newError("len(bs) <= 32")
+	}
+
 	var user *protocol.MemoryUser
-	var account *MemoryAccount
 	var err error
 
-	if len(users) > 1 {
-		bs := payload.Bytes()
-		if len(bs) <= 32 {
-			return nil, nil, newError("len(bs) <= 32")
-		}
-
-		var aeadCipher *AEADCipher
-		var ivLen int32
-		subkey := make([]byte, 32)
-		data := make([]byte, 8192)
-		var aead cipher.AEAD
+	count := validator.Count()
+	if count == 0 {
+		return nil, nil, newError("invalid user")
+	} else if count > 1 {
 		var d []byte
-		for _, user = range users {
-			account = user.Account.(*MemoryAccount)
-			aeadCipher = account.Cipher.(*AEADCipher)
-			ivLen = aeadCipher.IVSize()
-			subkey = subkey[:aeadCipher.KeyBytes]
-			hkdfSHA1(account.Key, bs[:ivLen], subkey)
-			aead = aeadCipher.AEADAuthCreator(subkey)
-			d, err = aead.Open(data[:0], data[8180:8192], bs[ivLen:], nil)
-			if err == nil {
-				payload.Clear()
-				payload.Write(d)
-				break
-			}
+		user, _, d, _, err = validator.Get(bs, protocol.RequestCommandUDP)
+
+		if user != nil {
+			payload.Clear()
+			payload.Write(d)
+		} else {
+			return nil, nil, newError("failed to decrypt UDP payload").Base(err)
 		}
 	} else {
-		user = users[0]
-		account = user.Account.(*MemoryAccount)
+		user, _ = validator.GetOnlyUser()
+		account := user.Account.(*MemoryAccount)
 
 		var iv []byte
 		if !account.Cipher.IsAEAD() && account.Cipher.IVSize() > 0 {
@@ -302,12 +281,9 @@ func DecodeUDPPacket(users []*protocol.MemoryUser, payload *buf.Buffer) (*protoc
 			iv = make([]byte, account.Cipher.IVSize())
 			copy(iv, payload.BytesTo(account.Cipher.IVSize()))
 		}
-
-		err = account.Cipher.DecodePacket(account.Key, payload)
-	}
-
-	if err != nil {
-		return nil, nil, newError("failed to decrypt UDP payload").Base(err)
+		if err = account.Cipher.DecodePacket(account.Key, payload); err != nil {
+			return nil, nil, newError("failed to decrypt UDP payload").Base(err)
+		}
 	}
 
 	request := &protocol.RequestHeader{
@@ -341,7 +317,10 @@ func (v *UDPReader) ReadMultiBuffer() (buf.MultiBuffer, error) {
 		buffer.Release()
 		return nil, err
 	}
-	u, payload, err := DecodeUDPPacket([]*protocol.MemoryUser{v.User}, buffer)
+	validator := new(Validator)
+	validator.Add(v.User)
+
+	u, payload, err := DecodeUDPPacket(validator, buffer)
 	if err != nil {
 		buffer.Release()
 		return nil, err

proxy/shadowsocks/protocol_test.go

@@ -38,14 +38,16 @@ func TestUDPEncoding(t *testing.T) {
 	encodedData, err := EncodeUDPPacket(request, data.Bytes())
 	common.Must(err)
 
-	decodedRequest, decodedData, err := DecodeUDPPacket([]*protocol.MemoryUser{request.User}, encodedData)
+	validator := new(Validator)
+	validator.Add(request.User)
+	decodedRequest, decodedData, err := DecodeUDPPacket(validator, encodedData)
 	common.Must(err)
 
 	if r := cmp.Diff(decodedData.Bytes(), data.Bytes()); r != "" {
 		t.Error("data: ", r)
 	}
 
-	if r := cmp.Diff(decodedRequest, request); r != "" {
+	if r := cmp.Diff(decodedRequest, request, cmp.Comparer(func(a1, a2 protocol.Account) bool { return a1.Equals(a2) })); r != "" {
 		t.Error("request: ", r)
 	}
 }
@@ -117,9 +119,11 @@ func TestTCPRequest(t *testing.T) {
 
 		common.Must(writer.WriteMultiBuffer(buf.MultiBuffer{data}))
 
-		decodedRequest, reader, err := ReadTCPSession([]*protocol.MemoryUser{request.User}, cache)
+		validator := new(Validator)
+		validator.Add(request.User)
+		decodedRequest, reader, err := ReadTCPSession(validator, cache)
 		common.Must(err)
-		if r := cmp.Diff(decodedRequest, request); r != "" {
+		if r := cmp.Diff(decodedRequest, request, cmp.Comparer(func(a1, a2 protocol.Account) bool { return a1.Equals(a2) })); r != "" {
 			t.Error("request: ", r)
 		}
 

proxy/shadowsocks/server.go

@@ -22,35 +22,46 @@ import (
 
 type Server struct {
 	config        *ServerConfig
-	users         []*protocol.MemoryUser
+	validator     *Validator
 	policyManager policy.Manager
 	cone          bool
 }
 
 // NewServer create a new Shadowsocks server.
 func NewServer(ctx context.Context, config *ServerConfig) (*Server, error) {
-	if config.Users == nil {
-		return nil, newError("empty users")
+	validator := new(Validator)
+	for _, user := range config.Users {
+		u, err := user.ToMemoryUser()
+		if err != nil {
+			return nil, newError("failed to get shadowsocks user").Base(err).AtError()
+		}
+
+		if err := validator.Add(u); err != nil {
+			return nil, newError("failed to add user").Base(err).AtError()
+		}
 	}
 
 	v := core.MustFromContext(ctx)
 	s := &Server{
 		config:        config,
+		validator:     validator,
 		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
 		cone:          ctx.Value("cone").(bool),
 	}
 
-	for _, user := range config.Users {
-		u, err := user.ToMemoryUser()
-		if err != nil {
-			return nil, newError("failed to parse user account").Base(err)
-		}
-		s.users = append(s.users, u)
-	}
-
 	return s, nil
 }
 
+// AddUser implements proxy.UserManager.AddUser().
+func (s *Server) AddUser(ctx context.Context, u *protocol.MemoryUser) error {
+	return s.validator.Add(u)
+}
+
+// RemoveUser implements proxy.UserManager.RemoveUser().
+func (s *Server) RemoveUser(ctx context.Context, e string) error {
+	return s.validator.Del(e)
+}
+
 func (s *Server) Network() []net.Network {
 	list := s.config.Network
 	if len(list) == 0 {
@@ -64,13 +75,13 @@ func (s *Server) Process(ctx context.Context, network net.Network, conn internet
 	case net.Network_TCP:
 		return s.handleConnection(ctx, conn, dispatcher)
 	case net.Network_UDP:
-		return s.handlerUDPPayload(ctx, conn, dispatcher)
+		return s.handleUDPPayload(ctx, conn, dispatcher)
 	default:
 		return newError("unknown network: ", network)
 	}
 }
 
-func (s *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection, dispatcher routing.Dispatcher) error {
+func (s *Server) handleUDPPayload(ctx context.Context, conn internet.Connection, dispatcher routing.Dispatcher) error {
 	udpServer := udp.NewDispatcher(dispatcher, func(ctx context.Context, packet *udp_proto.Packet) {
 		request := protocol.RequestHeaderFromContext(ctx)
 		if request == nil {
@@ -102,8 +113,9 @@ func (s *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection
 	if inbound == nil {
 		panic("no inbound metadata")
 	}
-	if len(s.users) == 1 {
-		inbound.User = s.users[0]
+
+	if s.validator.Count() == 1 {
+		inbound.User, _ = s.validator.GetOnlyUser()
 	}
 
 	var dest *net.Destination
@@ -121,9 +133,11 @@ func (s *Server) handlerUDPPayload(ctx context.Context, conn internet.Connection
 			var err error
 
 			if inbound.User != nil {
-				request, data, err = DecodeUDPPacket([]*protocol.MemoryUser{inbound.User}, payload)
+				validator := new(Validator)
+				validator.Add(inbound.User)
+				request, data, err = DecodeUDPPacket(validator, payload)
 			} else {
-				request, data, err = DecodeUDPPacket(s.users, payload)
+				request, data, err = DecodeUDPPacket(s.validator, payload)
 				if err == nil {
 					inbound.User = request.User
 				}
@@ -178,7 +192,7 @@ func (s *Server) handleConnection(ctx context.Context, conn internet.Connection,
 	}
 
 	bufferedReader := buf.BufferedReader{Reader: buf.NewReader(conn)}
-	request, bodyReader, err := ReadTCPSession(s.users, &bufferedReader)
+	request, bodyReader, err := ReadTCPSession(s.validator, &bufferedReader)
 	if err != nil {
 		log.Record(&log.AccessMessage{
 			From:   conn.RemoteAddr(),

proxy/shadowsocks/validator.go

@@ -0,0 +1,113 @@
+package shadowsocks
+
+import (
+	"crypto/cipher"
+	"strings"
+	"sync"
+
+	"github.com/xtls/xray-core/common/protocol"
+)
+
+// Validator stores valid Shadowsocks users.
+type Validator struct {
+	// Considering email's usage here, map + sync.Mutex/RWMutex may have better performance.
+	email sync.Map
+	users sync.Map
+}
+
+// Add a Shadowsocks user, Email must be empty or unique.
+func (v *Validator) Add(u *protocol.MemoryUser) error {
+	account := u.Account.(*MemoryAccount)
+
+	if !account.Cipher.IsAEAD() && v.Count() > 0 {
+		return newError("The cipher do not support Single-port Multi-user")
+	}
+
+	if u.Email != "" {
+		_, loaded := v.email.LoadOrStore(strings.ToLower(u.Email), u)
+		if loaded {
+			return newError("User ", u.Email, " already exists.")
+		}
+	}
+
+	v.users.Store(string(account.Key)+"&"+account.GetCipherName(), u)
+	return nil
+}
+
+// Del a Shadowsocks user with a non-empty Email.
+func (v *Validator) Del(e string) error {
+	if e == "" {
+		return newError("Email must not be empty.")
+	}
+	le := strings.ToLower(e)
+	u, _ := v.email.Load(le)
+	if u == nil {
+		return newError("User ", e, " not found.")
+	}
+	account := u.(*protocol.MemoryUser).Account.(*MemoryAccount)
+	v.email.Delete(le)
+	v.users.Delete(string(account.Key) + "&" + account.GetCipherName())
+	return nil
+}
+
+// Count the number of Shadowsocks users
+func (v *Validator) Count() int {
+	length := 0
+	v.users.Range(func(_, _ interface{}) bool {
+		length++
+
+		return true
+	})
+	return length
+}
+
+// Get a Shadowsocks user and the user's cipher.
+func (v *Validator) Get(bs []byte, command protocol.RequestCommand) (u *protocol.MemoryUser, aead cipher.AEAD, ret []byte, ivLen int32, err error) {
+	var dataSize int
+
+	switch command {
+	case protocol.RequestCommandTCP:
+		dataSize = 16
+	case protocol.RequestCommandUDP:
+		dataSize = 8192
+	}
+
+	var aeadCipher *AEADCipher
+	subkey := make([]byte, 32)
+	data := make([]byte, dataSize)
+
+	v.users.Range(func(key, user interface{}) bool {
+		account := user.(*protocol.MemoryUser).Account.(*MemoryAccount)
+		aeadCipher = account.Cipher.(*AEADCipher)
+		ivLen = aeadCipher.IVSize()
+		subkey = subkey[:aeadCipher.KeyBytes]
+		hkdfSHA1(account.Key, bs[:ivLen], subkey)
+		aead = aeadCipher.AEADAuthCreator(subkey)
+
+		switch command {
+		case protocol.RequestCommandTCP:
+			ret, err = aead.Open(data[:0], data[4:16], bs[ivLen:ivLen+18], nil)
+		case protocol.RequestCommandUDP:
+			ret, err = aead.Open(data[:0], data[8180:8192], bs[ivLen:], nil)
+		}
+
+		if err == nil {
+			u = user.(*protocol.MemoryUser)
+			return false
+		}
+		return true
+	})
+
+	return
+}
+
+// Get the only user without authentication
+func (v *Validator) GetOnlyUser() (u *protocol.MemoryUser, ivLen int32) {
+	v.users.Range(func(_, user interface{}) bool {
+		u = user.(*protocol.MemoryUser)
+		return false
+	})
+	ivLen = u.Account.(*MemoryAccount).Cipher.IVSize()
+
+	return
+}

proxy/socks/protocol.go

@@ -422,16 +422,6 @@ func ClientHandshake(request *protocol.RequestHeader, reader io.Reader, writer i
 	defer b.Release()
 
 	common.Must2(b.Write([]byte{socks5Version, 0x01, authByte}))
-	if authByte == authPassword {
-		account := request.User.Account.(*Account)
-
-		common.Must(b.WriteByte(0x01))
-		common.Must(b.WriteByte(byte(len(account.Username))))
-		common.Must2(b.WriteString(account.Username))
-		common.Must(b.WriteByte(byte(len(account.Password))))
-		common.Must2(b.WriteString(account.Password))
-	}
-
 	if err := buf.WriteAllBytes(writer, b.Bytes()); err != nil {
 		return nil, err
 	}
@@ -449,6 +439,17 @@ func ClientHandshake(request *protocol.RequestHeader, reader io.Reader, writer i
 	}
 
 	if authByte == authPassword {
+		b.Clear()
+		account := request.User.Account.(*Account)
+		common.Must(b.WriteByte(0x01))
+		common.Must(b.WriteByte(byte(len(account.Username))))
+		common.Must2(b.WriteString(account.Username))
+		common.Must(b.WriteByte(byte(len(account.Password))))
+		common.Must2(b.WriteString(account.Password))
+		if err := buf.WriteAllBytes(writer, b.Bytes()); err != nil {
+			return nil, err
+		}
+
 		b.Clear()
 		if _, err := b.ReadFullFrom(reader, 2); err != nil {
 			return nil, err
@@ -465,8 +466,12 @@ func ClientHandshake(request *protocol.RequestHeader, reader io.Reader, writer i
 		command = byte(cmdUDPAssociate)
 	}
 	common.Must2(b.Write([]byte{socks5Version, command, 0x00 /* reserved */}))
-	if err := addrParser.WriteAddressPort(b, request.Address, request.Port); err != nil {
-		return nil, err
+	if request.Command == protocol.RequestCommandUDP {
+		common.Must2(b.Write([]byte{1, 0, 0, 0, 0, 0, 0 /* RFC 1928 */}))
+	} else {
+		if err := addrParser.WriteAddressPort(b, request.Address, request.Port); err != nil {
+			return nil, err
+		}
 	}
 
 	if err := buf.WriteAllBytes(writer, b.Bytes()); err != nil {

proxy/trojan/server.go

@@ -458,7 +458,7 @@ func (s *Server) fallback(ctx context.Context, sid errors.ExportOption, err erro
 						if k == '\r' || k == '\n' { // avoid logging \r or \n
 							break
 						}
-						if k == ' ' {
+						if k == '?' || k == ' ' {
 							path = string(firstBytes[i:j])
 							newError("realPath = " + path).AtInfo().WriteToLog(sid)
 							if pfb[path] == nil {
@@ -500,19 +500,16 @@ func (s *Server) fallback(ctx context.Context, sid errors.ExportOption, err erro
 	postRequest := func() error {
 		defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
 		if fb.Xver != 0 {
-			var remoteAddr, remotePort, localAddr, localPort string
-			ipType, network := 0, connection.RemoteAddr().Network()
-			if len(network) >= 3 && network[:3] == "tcp" {
-				var err error
-				remoteAddr, remotePort, err = net.SplitHostPort(connection.RemoteAddr().String())
-				if err != nil {
-					return err
-				}
-				localAddr, localPort, err = net.SplitHostPort(connection.LocalAddr().String())
-				if err != nil {
-					return err
-				}
-				ipType = 4
+			ipType := 4
+			remoteAddr, remotePort, err := net.SplitHostPort(connection.RemoteAddr().String())
+			if err != nil {
+				ipType = 0
+			}
+			localAddr, localPort, err := net.SplitHostPort(connection.LocalAddr().String())
+			if err != nil {
+				ipType = 0
+			}
+			if ipType == 4 {
 				for i := 0; i < len(remoteAddr); i++ {
 					if remoteAddr[i] == ':' {
 						ipType = 6

proxy/vless/inbound/inbound.go

@@ -293,7 +293,7 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection i
 								if k == '\r' || k == '\n' { // avoid logging \r or \n
 									break
 								}
-								if k == ' ' {
+								if k == '?' || k == ' ' {
 									path = string(firstBytes[i:j])
 									newError("realPath = " + path).AtInfo().WriteToLog(sid)
 									if pfb[path] == nil {
@@ -335,19 +335,16 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection i
 			postRequest := func() error {
 				defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
 				if fb.Xver != 0 {
-					var remoteAddr, remotePort, localAddr, localPort string
-					ipType, network := 0, connection.RemoteAddr().Network()
-					if len(network) >= 3 && network[:3] == "tcp" {
-						var err error
-						remoteAddr, remotePort, err = net.SplitHostPort(connection.RemoteAddr().String())
-						if err != nil {
-							return err
-						}
-						localAddr, localPort, err = net.SplitHostPort(connection.LocalAddr().String())
-						if err != nil {
-							return err
-						}
-						ipType = 4
+					ipType := 4
+					remoteAddr, remotePort, err := net.SplitHostPort(connection.RemoteAddr().String())
+					if err != nil {
+						ipType = 0
+					}
+					localAddr, localPort, err := net.SplitHostPort(connection.LocalAddr().String())
+					if err != nil {
+						ipType = 0
+					}
+					if ipType == 4 {
 						for i := 0; i < len(remoteAddr); i++ {
 							if remoteAddr[i] == ':' {
 								ipType = 6

proxy/vless/outbound/outbound.go

@@ -16,6 +16,7 @@ import (
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/common/signal"
 	"github.com/xtls/xray-core/common/task"
+	"github.com/xtls/xray-core/common/xudp"
 	core "github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/policy"
 	"github.com/xtls/xray-core/features/stats"
@@ -48,6 +49,7 @@ type Handler struct {
 	serverList    *protocol.ServerList
 	serverPicker  protocol.ServerPicker
 	policyManager policy.Manager
+	cone          bool
 }
 
 // New creates a new VLess outbound handler.
@@ -66,6 +68,7 @@ func New(ctx context.Context, config *Config) (*Handler, error) {
 		serverList:    serverList,
 		serverPicker:  protocol.NewRoundRobinServerPicker(serverList),
 		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
+		cone:          ctx.Value("cone").(bool),
 	}
 
 	return handler, nil
@@ -175,6 +178,12 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	clientReader := link.Reader // .(*pipe.Reader)
 	clientWriter := link.Writer // .(*pipe.Writer)
 
+	if request.Command == protocol.RequestCommandUDP && h.cone && request.Port != 53 && request.Port != 443 {
+		request.Command = protocol.RequestCommandMux
+		request.Address = net.DomainAddress("v1.mux.cool")
+		request.Port = net.Port(666)
+	}
+
 	postRequest := func() error {
 		defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
 
@@ -185,6 +194,9 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 
 		// default: serverWriter := bufferWriter
 		serverWriter := encoding.EncodeBodyAddons(bufferWriter, request, requestAddons)
+		if request.Command == protocol.RequestCommandMux && request.Port == 666 {
+			serverWriter = xudp.NewPacketWriter(serverWriter, target)
+		}
 		if err := buf.CopyOnceTimeout(clientReader, serverWriter, time.Millisecond*100); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout {
 			return err // ...
 		}
@@ -216,6 +228,9 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 
 		// default: serverReader := buf.NewReader(conn)
 		serverReader := encoding.DecodeBodyAddons(conn, request, responseAddons)
+		if request.Command == protocol.RequestCommandMux && request.Port == 666 {
+			serverReader = xudp.NewPacketReader(conn)
+		}
 
 		if rawConn != nil {
 			var counter stats.Counter

proxy/vmess/aead/kdf.go

@@ -6,11 +6,20 @@ import (
 	"hash"
 )
 
+type hash2 struct {
+	hash.Hash
+}
+
 func KDF(key []byte, path ...string) []byte {
 	hmacf := hmac.New(sha256.New, []byte(KDFSaltConstVMessAEADKDF))
 
 	for _, v := range path {
+		first := true
 		hmacf = hmac.New(func() hash.Hash {
+			if first {
+				first = false
+				return hash2{hmacf}
+			}
 			return hmacf
 		}, []byte(v))
 	}

proxy/vmess/encoding/server.go

@@ -118,6 +118,11 @@ func NewServerSession(validator *vmess.TimedUserValidator, sessionHistory *Sessi
 	}
 }
 
+// SetAEADForced sets isAEADForced for a ServerSession.
+func (s *ServerSession) SetAEADForced(isAEADForced bool) {
+	s.isAEADForced = isAEADForced
+}
+
 func parseSecurityType(b byte) protocol.SecurityType {
 	if _, f := protocol.SecurityType_name[int32(b)]; f {
 		st := protocol.SecurityType(b)

proxy/vmess/inbound/inbound.go

@@ -14,6 +14,7 @@ import (
 	"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/platform"
 	"github.com/xtls/xray-core/common/protocol"
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/common/signal"
@@ -28,6 +29,10 @@ import (
 	"github.com/xtls/xray-core/transport/internet"
 )
 
+var (
+	aeadForced = false
+)
+
 type userByEmail struct {
 	sync.Mutex
 	cache           map[string]*protocol.MemoryUser
@@ -231,6 +236,7 @@ func (h *Handler) Process(ctx context.Context, network net.Network, connection i
 
 	reader := &buf.BufferedReader{Reader: buf.NewReader(connection)}
 	svrSession := encoding.NewServerSession(h.clients, h.sessionHistory)
+	svrSession.SetAEADForced(aeadForced)
 	request, err := svrSession.DecodeRequestHeader(reader, isDrain)
 	if err != nil {
 		if errors.Cause(err) != io.EOF {
@@ -361,4 +367,9 @@ func init() {
 	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
 		return New(ctx, config.(*Config))
 	}))
+
+	const defaultFlagValue = "NOT_DEFINED_AT_ALL"
+
+	isAeadForced := platform.NewEnvFlag("xray.vmess.aead.forced").GetValue(func() string { return defaultFlagValue })
+	aeadForced = (isAeadForced == "true")
 }

proxy/vmess/outbound/outbound.go

@@ -15,6 +15,7 @@ import (
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/common/signal"
 	"github.com/xtls/xray-core/common/task"
+	"github.com/xtls/xray-core/common/xudp"
 	core "github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/policy"
 	"github.com/xtls/xray-core/proxy/vmess"
@@ -28,6 +29,7 @@ type Handler struct {
 	serverList    *protocol.ServerList
 	serverPicker  protocol.ServerPicker
 	policyManager policy.Manager
+	cone          bool
 }
 
 // New creates a new VMess outbound handler.
@@ -46,6 +48,7 @@ func New(ctx context.Context, config *Config) (*Handler, error) {
 		serverList:    serverList,
 		serverPicker:  protocol.NewRoundRobinServerPicker(serverList),
 		policyManager: v.GetFeature(policy.ManagerType()).(policy.Manager),
+		cone:          ctx.Value("cone").(bool),
 	}
 
 	return handler, nil
@@ -108,6 +111,12 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		request.Option.Set(protocol.RequestOptionGlobalPadding)
 	}
 
+	if request.Security == protocol.SecurityType_ZERO {
+		request.Security = protocol.SecurityType_NONE
+		request.Option.Clear(protocol.RequestOptionChunkStream)
+		request.Option.Clear(protocol.RequestOptionChunkMasking)
+	}
+
 	input := link.Reader
 	output := link.Writer
 
@@ -122,6 +131,12 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 	ctx, cancel := context.WithCancel(ctx)
 	timer := signal.CancelAfterInactivity(ctx, cancel, sessionPolicy.Timeouts.ConnectionIdle)
 
+	if request.Command == protocol.RequestCommandUDP && h.cone && request.Port != 53 && request.Port != 443 {
+		request.Command = protocol.RequestCommandMux
+		request.Address = net.DomainAddress("v1.mux.cool")
+		request.Port = net.Port(666)
+	}
+
 	requestDone := func() error {
 		defer timer.SetTimeout(sessionPolicy.Timeouts.DownlinkOnly)
 
@@ -131,6 +146,10 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		}
 
 		bodyWriter := session.EncodeRequestBody(request, writer)
+		bodyWriter2 := bodyWriter
+		if request.Command == protocol.RequestCommandMux && request.Port == 666 {
+			bodyWriter = xudp.NewPacketWriter(bodyWriter, target)
+		}
 		if err := buf.CopyOnceTimeout(input, bodyWriter, time.Millisecond*100); err != nil && err != buf.ErrNotTimeoutReader && err != buf.ErrReadTimeout {
 			return newError("failed to write first payload").Base(err)
 		}
@@ -144,7 +163,7 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		}
 
 		if request.Option.Has(protocol.RequestOptionChunkStream) {
-			if err := bodyWriter.WriteMultiBuffer(buf.MultiBuffer{}); err != nil {
+			if err := bodyWriter2.WriteMultiBuffer(buf.MultiBuffer{}); err != nil {
 				return err
 			}
 		}
@@ -163,6 +182,9 @@ func (h *Handler) Process(ctx context.Context, link *transport.Link, dialer inte
 		h.handleCommand(rec.Destination(), header.Command)
 
 		bodyReader := session.DecodeResponseBody(request, reader)
+		if request.Command == protocol.RequestCommandMux && request.Port == 666 {
+			bodyReader = xudp.NewPacketReader(&buf.BufferedReader{Reader: bodyReader})
+		}
 
 		return buf.Copy(bodyReader, output, buf.UpdateActivity(timer))
 	}

testing/mocks/dns.go

@@ -6,6 +6,7 @@ package mocks
 
 import (
 	gomock "github.com/golang/mock/gomock"
+	dns "github.com/xtls/xray-core/features/dns"
 	net "net"
 	reflect "reflect"
 )
@@ -48,18 +49,18 @@ func (mr *DNSClientMockRecorder) Close() *gomock.Call {
 }
 
 // LookupIP mocks base method
-func (m *DNSClient) LookupIP(arg0 string) ([]net.IP, error) {
+func (m *DNSClient) LookupIP(arg0 string, arg1 dns.IPOption) ([]net.IP, error) {
 	m.ctrl.T.Helper()
-	ret := m.ctrl.Call(m, "LookupIP", arg0)
+	ret := m.ctrl.Call(m, "LookupIP", arg0, arg1)
 	ret0, _ := ret[0].([]net.IP)
 	ret1, _ := ret[1].(error)
 	return ret0, ret1
 }
 
 // LookupIP indicates an expected call of LookupIP
-func (mr *DNSClientMockRecorder) LookupIP(arg0 interface{}) *gomock.Call {
+func (mr *DNSClientMockRecorder) LookupIP(arg0, arg1 interface{}) *gomock.Call {
 	mr.mock.ctrl.T.Helper()
-	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LookupIP", reflect.TypeOf((*DNSClient)(nil).LookupIP), arg0)
+	return mr.mock.ctrl.RecordCallWithMethodType(mr.mock, "LookupIP", reflect.TypeOf((*DNSClient)(nil).LookupIP), arg0, arg1)
 }
 
 // Start mocks base method