Refine PrioritizedDomain, should fix https://github.com/XTLS/Xray-core/issues/638

Merge branch 'dns' into dns-geo

.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

@@ -17,12 +17,15 @@
 - 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)
 - Homebrew
-  - [Repository 0](https://github.com/N4FA/homebrew-xray)
-  - [Repository 1](https://github.com/xiruizhao/homebrew-xray)
+  - `brew install xray`
+  - [(Tap) Repository 0](https://github.com/N4FA/homebrew-xray)
+  - [(Tap) Repository 1](https://github.com/xiruizhao/homebrew-xray)
 
 ## Usage
 
@@ -38,6 +41,7 @@
 - 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 {
+	if request.ExcludedDomainMatcher != nil {
+		if request.ExcludedDomainMatcher.ApplyDomain(domain) {
 			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" &&
+			destination.Address.Family().IsIP() && fakeDNSEngine.GetFakeIPRange().Contains(destination.Address.IP()) {
+			newError("Using sniffer ", protocolString, " since the fake DNS missed").WriteToLog(session.ExportIDToError(ctx))
 			return true
 		}
 	}
@@ -193,6 +205,16 @@ func shouldOverride(result SniffResult, request session.SniffingRequest) bool {
 	return false
 }
 
+func canSniff(ctx context.Context, req session.SniffingRequest, destination net.Destination) bool {
+	if destination.Address.Family().IsIP() && req.ExcludedIPMatcher != nil {
+		if req.ExcludedIPMatcher.MatchIP(destination.Address.IP()) {
+			return false
+		}
+	}
+
+	return true
+}
+
 // Dispatch implements routing.Dispatcher.
 func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destination) (*transport.Link, error) {
 	if !destination.IsValid() {
@@ -210,19 +232,39 @@ 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 {
+
+	if !canSniff(ctx, sniffingRequest, destination) {
+		newError("skip sniffing for ip ", destination.Address.String()).AtDebug().WriteToLog()
+		sniffingRequest.Enabled = false
+	}
+
+	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)
@@ -234,48 +276,59 @@ 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) {
 	var handler outbound.Handler
 
-	skipRoutePick := false
-	if content := session.ContentFromContext(ctx); content != nil {
-		skipRoutePick = content.SkipRoutePick
-	}
-
 	routingLink := routing_session.AsRoutingContext(ctx)
 	inTag := routingLink.GetInboundTag()
 	isPickRoute := false
-	if d.router != nil && !skipRoutePick {
+	if d.router != nil {
 		if route, err := d.router.PickRoute(routingLink); err == nil {
 			outTag := route.GetOutboundTag()
 			isPickRoute = true

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.go

@@ -0,0 +1,64 @@
+package dns
+
+import (
+	dm "github.com/xtls/xray-core/common/matcher/domain"
+	"github.com/xtls/xray-core/common/matcher/str"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/uuid"
+)
+
+var typeMap = map[dm.MatchingType]str.Type{
+	dm.MatchingType_Keyword:   str.Substr,
+	dm.MatchingType_Regex:     str.Regex,
+	dm.MatchingType_Subdomain: str.Domain,
+	dm.MatchingType_Full:      str.Full,
+}
+
+// References:
+// https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml
+// https://unix.stackexchange.com/questions/92441/whats-the-difference-between-local-home-and-lan
+var localTLDsAndDotlessDomains = []*dm.Domain{
+	{Type: dm.MatchingType_Regex, Value: "^[^.]+$"}, // This will only match domains without any dot
+	{Type: dm.MatchingType_Subdomain, Value: "local"},
+	{Type: dm.MatchingType_Subdomain, Value: "localdomain"},
+	{Type: dm.MatchingType_Subdomain, Value: "localhost"},
+	{Type: dm.MatchingType_Subdomain, Value: "lan"},
+	{Type: dm.MatchingType_Subdomain, Value: "home.arpa"},
+	{Type: dm.MatchingType_Subdomain, Value: "example"},
+	{Type: dm.MatchingType_Subdomain, Value: "invalid"},
+	{Type: dm.MatchingType_Subdomain, Value: "test"},
+}
+
+var localTLDsAndDotlessDomainsRule = &NameServer_OriginalRule{
+	Rule: "geosite:private",
+	Size: uint32(len(localTLDsAndDotlessDomains)),
+}
+
+func toStrMatcher(t dm.MatchingType, domain string) (str.Matcher, error) {
+	strMType, f := typeMap[t]
+	if !f {
+		return nil, newError("unknown mapping type", t).AtWarning()
+	}
+	matcher, err := strMType.New(domain)
+	if err != nil {
+		return nil, newError("failed to create str matcher").Base(err)
+	}
+	return matcher, nil
+}
+
+func toNetIP(addrs []net.Address) ([]net.IP, error) {
+	ips := make([]net.IP, 0, len(addrs))
+	for _, addr := range addrs {
+		if addr.Family().IsIP() {
+			ips = append(ips, addr.IP())
+		} else {
+			return nil, newError("Failed to convert address", addr, "to Net IP.").AtWarning()
+		}
+	}
+	return ips, nil
+}
+
+func generateRandomTag() string {
+	id := uuid.New()
+	return "xray.system." + id.String()
+}

app/dns/config.pb.go

@@ -1,14 +1,14 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.25.0
-// 	protoc        v3.14.0
+// 	protoc-gen-go v1.26.0
+// 	protoc        v3.15.8
 // source: app/dns/config.proto
 
 package dns
 
 import (
-	proto "github.com/golang/protobuf/proto"
-	router "github.com/xtls/xray-core/app/router"
+	domain "github.com/xtls/xray-core/common/matcher/domain"
+	geoip "github.com/xtls/xray-core/common/matcher/geoip"
 	net "github.com/xtls/xray-core/common/net"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
@@ -23,71 +23,115 @@ const (
 	_ = 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 DomainMatchingType int32
+type QueryStrategy int32
 
 const (
-	DomainMatchingType_Full      DomainMatchingType = 0
-	DomainMatchingType_Subdomain DomainMatchingType = 1
-	DomainMatchingType_Keyword   DomainMatchingType = 2
-	DomainMatchingType_Regex     DomainMatchingType = 3
+	QueryStrategy_USE_IP  QueryStrategy = 0
+	QueryStrategy_USE_IP4 QueryStrategy = 1
+	QueryStrategy_USE_IP6 QueryStrategy = 2
 )
 
-// Enum value maps for DomainMatchingType.
+// Enum value maps for QueryStrategy.
 var (
-	DomainMatchingType_name = map[int32]string{
-		0: "Full",
-		1: "Subdomain",
-		2: "Keyword",
-		3: "Regex",
+	QueryStrategy_name = map[int32]string{
+		0: "USE_IP",
+		1: "USE_IP4",
+		2: "USE_IP6",
 	}
-	DomainMatchingType_value = map[string]int32{
-		"Full":      0,
-		"Subdomain": 1,
-		"Keyword":   2,
-		"Regex":     3,
+	QueryStrategy_value = map[string]int32{
+		"USE_IP":  0,
+		"USE_IP4": 1,
+		"USE_IP6": 2,
 	}
 )
 
-func (x DomainMatchingType) Enum() *DomainMatchingType {
-	p := new(DomainMatchingType)
+func (x QueryStrategy) Enum() *QueryStrategy {
+	p := new(QueryStrategy)
 	*p = x
 	return p
 }
 
-func (x DomainMatchingType) String() string {
+func (x QueryStrategy) String() string {
 	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
 }
 
-func (DomainMatchingType) Descriptor() protoreflect.EnumDescriptor {
+func (QueryStrategy) Descriptor() protoreflect.EnumDescriptor {
 	return file_app_dns_config_proto_enumTypes[0].Descriptor()
 }
 
-func (DomainMatchingType) Type() protoreflect.EnumType {
+func (QueryStrategy) Type() protoreflect.EnumType {
 	return &file_app_dns_config_proto_enumTypes[0]
 }
 
-func (x DomainMatchingType) Number() protoreflect.EnumNumber {
+func (x QueryStrategy) Number() protoreflect.EnumNumber {
 	return protoreflect.EnumNumber(x)
 }
 
-// Deprecated: Use DomainMatchingType.Descriptor instead.
-func (DomainMatchingType) EnumDescriptor() ([]byte, []int) {
+// Deprecated: Use QueryStrategy.Descriptor instead.
+func (QueryStrategy) EnumDescriptor() ([]byte, []int) {
 	return file_app_dns_config_proto_rawDescGZIP(), []int{0}
 }
 
+type CacheStrategy int32
+
+const (
+	CacheStrategy_Cache_ALL     CacheStrategy = 0
+	CacheStrategy_Cache_NOERROR CacheStrategy = 1
+	CacheStrategy_Cache_DISABLE CacheStrategy = 2
+)
+
+// Enum value maps for CacheStrategy.
+var (
+	CacheStrategy_name = map[int32]string{
+		0: "Cache_ALL",
+		1: "Cache_NOERROR",
+		2: "Cache_DISABLE",
+	}
+	CacheStrategy_value = map[string]int32{
+		"Cache_ALL":     0,
+		"Cache_NOERROR": 1,
+		"Cache_DISABLE": 2,
+	}
+)
+
+func (x CacheStrategy) Enum() *CacheStrategy {
+	p := new(CacheStrategy)
+	*p = x
+	return p
+}
+
+func (x CacheStrategy) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (CacheStrategy) Descriptor() protoreflect.EnumDescriptor {
+	return file_app_dns_config_proto_enumTypes[1].Descriptor()
+}
+
+func (CacheStrategy) Type() protoreflect.EnumType {
+	return &file_app_dns_config_proto_enumTypes[1]
+}
+
+func (x CacheStrategy) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use CacheStrategy.Descriptor instead.
+func (CacheStrategy) EnumDescriptor() ([]byte, []int) {
+	return file_app_dns_config_proto_rawDescGZIP(), []int{1}
+}
+
 type NameServer struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Address           *net.Endpoint                `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
-	PrioritizedDomain []*NameServer_PriorityDomain `protobuf:"bytes,2,rep,name=prioritized_domain,json=prioritizedDomain,proto3" json:"prioritized_domain,omitempty"`
-	Geoip             []*router.GeoIP              `protobuf:"bytes,3,rep,name=geoip,proto3" json:"geoip,omitempty"`
-	OriginalRules     []*NameServer_OriginalRule   `protobuf:"bytes,4,rep,name=original_rules,json=originalRules,proto3" json:"original_rules,omitempty"`
+	Address           *net.Endpoint              `protobuf:"bytes,1,opt,name=address,proto3" json:"address,omitempty"`
+	ClientIp          []byte                     `protobuf:"bytes,5,opt,name=client_ip,json=clientIp,proto3" json:"client_ip,omitempty"`
+	SkipFallback      bool                       `protobuf:"varint,6,opt,name=skipFallback,proto3" json:"skipFallback,omitempty"`
+	PrioritizedDomain []*domain.Domain           `protobuf:"bytes,2,rep,name=prioritized_domain,json=prioritizedDomain,proto3" json:"prioritized_domain,omitempty"`
+	Geoip             []*geoip.GeoIP             `protobuf:"bytes,3,rep,name=geoip,proto3" json:"geoip,omitempty"`
+	OriginalRules     []*NameServer_OriginalRule `protobuf:"bytes,4,rep,name=original_rules,json=originalRules,proto3" json:"original_rules,omitempty"`
 }
 
 func (x *NameServer) Reset() {
@@ -129,14 +173,28 @@ func (x *NameServer) GetAddress() *net.Endpoint {
 	return nil
 }
 
-func (x *NameServer) GetPrioritizedDomain() []*NameServer_PriorityDomain {
+func (x *NameServer) GetClientIp() []byte {
+	if x != nil {
+		return x.ClientIp
+	}
+	return nil
+}
+
+func (x *NameServer) GetSkipFallback() bool {
+	if x != nil {
+		return x.SkipFallback
+	}
+	return false
+}
+
+func (x *NameServer) GetPrioritizedDomain() []*domain.Domain {
 	if x != nil {
 		return x.PrioritizedDomain
 	}
 	return nil
 }
 
-func (x *NameServer) GetGeoip() []*router.GeoIP {
+func (x *NameServer) GetGeoip() []*geoip.GeoIP {
 	if x != nil {
 		return x.Geoip
 	}
@@ -174,6 +232,10 @@ type Config struct {
 	StaticHosts []*Config_HostMapping `protobuf:"bytes,4,rep,name=static_hosts,json=staticHosts,proto3" json:"static_hosts,omitempty"`
 	// Tag is the inbound tag of DNS client.
 	Tag string `protobuf:"bytes,6,opt,name=tag,proto3" json:"tag,omitempty"`
+	// DisableCache disables DNS cache
+	CacheStrategy   CacheStrategy `protobuf:"varint,8,opt,name=cache_strategy,json=cacheStrategy,proto3,enum=xray.app.dns.CacheStrategy" json:"cache_strategy,omitempty"`
+	QueryStrategy   QueryStrategy `protobuf:"varint,9,opt,name=query_strategy,json=queryStrategy,proto3,enum=xray.app.dns.QueryStrategy" json:"query_strategy,omitempty"`
+	DisableFallback bool          `protobuf:"varint,10,opt,name=disableFallback,proto3" json:"disableFallback,omitempty"`
 }
 
 func (x *Config) Reset() {
@@ -252,59 +314,25 @@ func (x *Config) GetTag() string {
 	return ""
 }
 
-type NameServer_PriorityDomain struct {
-	state         protoimpl.MessageState
-	sizeCache     protoimpl.SizeCache
-	unknownFields protoimpl.UnknownFields
-
-	Type   DomainMatchingType `protobuf:"varint,1,opt,name=type,proto3,enum=xray.app.dns.DomainMatchingType" json:"type,omitempty"`
-	Domain string             `protobuf:"bytes,2,opt,name=domain,proto3" json:"domain,omitempty"`
-}
-
-func (x *NameServer_PriorityDomain) Reset() {
-	*x = NameServer_PriorityDomain{}
-	if protoimpl.UnsafeEnabled {
-		mi := &file_app_dns_config_proto_msgTypes[2]
-		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
-		ms.StoreMessageInfo(mi)
-	}
-}
-
-func (x *NameServer_PriorityDomain) String() string {
-	return protoimpl.X.MessageStringOf(x)
-}
-
-func (*NameServer_PriorityDomain) ProtoMessage() {}
-
-func (x *NameServer_PriorityDomain) ProtoReflect() protoreflect.Message {
-	mi := &file_app_dns_config_proto_msgTypes[2]
-	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 NameServer_PriorityDomain.ProtoReflect.Descriptor instead.
-func (*NameServer_PriorityDomain) Descriptor() ([]byte, []int) {
-	return file_app_dns_config_proto_rawDescGZIP(), []int{0, 0}
-}
-
-func (x *NameServer_PriorityDomain) GetType() DomainMatchingType {
+func (x *Config) GetCacheStrategy() CacheStrategy {
 	if x != nil {
-		return x.Type
+		return x.CacheStrategy
 	}
-	return DomainMatchingType_Full
+	return CacheStrategy_Cache_ALL
 }
 
-func (x *NameServer_PriorityDomain) GetDomain() string {
+func (x *Config) GetQueryStrategy() QueryStrategy {
 	if x != nil {
-		return x.Domain
+		return x.QueryStrategy
 	}
-	return ""
+	return QueryStrategy_USE_IP
+}
+
+func (x *Config) GetDisableFallback() bool {
+	if x != nil {
+		return x.DisableFallback
+	}
+	return false
 }
 
 type NameServer_OriginalRule struct {
@@ -319,7 +347,7 @@ type NameServer_OriginalRule struct {
 func (x *NameServer_OriginalRule) Reset() {
 	*x = NameServer_OriginalRule{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_dns_config_proto_msgTypes[3]
+		mi := &file_app_dns_config_proto_msgTypes[2]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -332,7 +360,7 @@ func (x *NameServer_OriginalRule) String() string {
 func (*NameServer_OriginalRule) ProtoMessage() {}
 
 func (x *NameServer_OriginalRule) ProtoReflect() protoreflect.Message {
-	mi := &file_app_dns_config_proto_msgTypes[3]
+	mi := &file_app_dns_config_proto_msgTypes[2]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -345,7 +373,7 @@ func (x *NameServer_OriginalRule) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use NameServer_OriginalRule.ProtoReflect.Descriptor instead.
 func (*NameServer_OriginalRule) Descriptor() ([]byte, []int) {
-	return file_app_dns_config_proto_rawDescGZIP(), []int{0, 1}
+	return file_app_dns_config_proto_rawDescGZIP(), []int{0, 0}
 }
 
 func (x *NameServer_OriginalRule) GetRule() string {
@@ -367,19 +395,18 @@ type Config_HostMapping struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Type   DomainMatchingType `protobuf:"varint,1,opt,name=type,proto3,enum=xray.app.dns.DomainMatchingType" json:"type,omitempty"`
-	Domain string             `protobuf:"bytes,2,opt,name=domain,proto3" json:"domain,omitempty"`
-	Ip     [][]byte           `protobuf:"bytes,3,rep,name=ip,proto3" json:"ip,omitempty"`
+	Type   domain.MatchingType `protobuf:"varint,1,opt,name=type,proto3,enum=xray.common.matcher.domain.MatchingType" json:"type,omitempty"`
+	Domain string              `protobuf:"bytes,2,opt,name=domain,proto3" json:"domain,omitempty"`
+	Ip     [][]byte            `protobuf:"bytes,3,rep,name=ip,proto3" json:"ip,omitempty"`
 	// ProxiedDomain indicates the mapped domain has the same IP address on this
-	// domain. Xray will use this domain for IP queries. This field is only
-	// effective if ip is empty.
+	// domain. Xray will use this domain for IP queries.
 	ProxiedDomain string `protobuf:"bytes,4,opt,name=proxied_domain,json=proxiedDomain,proto3" json:"proxied_domain,omitempty"`
 }
 
 func (x *Config_HostMapping) Reset() {
 	*x = Config_HostMapping{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_dns_config_proto_msgTypes[5]
+		mi := &file_app_dns_config_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -392,7 +419,7 @@ func (x *Config_HostMapping) String() string {
 func (*Config_HostMapping) ProtoMessage() {}
 
 func (x *Config_HostMapping) ProtoReflect() protoreflect.Message {
-	mi := &file_app_dns_config_proto_msgTypes[5]
+	mi := &file_app_dns_config_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -408,11 +435,11 @@ func (*Config_HostMapping) Descriptor() ([]byte, []int) {
 	return file_app_dns_config_proto_rawDescGZIP(), []int{1, 1}
 }
 
-func (x *Config_HostMapping) GetType() DomainMatchingType {
+func (x *Config_HostMapping) GetType() domain.MatchingType {
 	if x != nil {
 		return x.Type
 	}
-	return DomainMatchingType_Full
+	return domain.MatchingType_Full
 }
 
 func (x *Config_HostMapping) GetDomain() string {
@@ -444,79 +471,96 @@ var file_app_dns_config_proto_rawDesc = []byte{
 	0x2e, 0x64, 0x6e, 0x73, 0x1a, 0x18, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2f, 0x6e, 0x65, 0x74,
 	0x2f, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x1c,
 	0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2f, 0x6e, 0x65, 0x74, 0x2f, 0x64, 0x65, 0x73, 0x74, 0x69,
-	0x6e, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x1a, 0x17, 0x61, 0x70,
-	0x70, 0x2f, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x2f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2e,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xad, 0x03, 0x0a, 0x0a, 0x4e, 0x61, 0x6d, 0x65, 0x53, 0x65,
-	0x72, 0x76, 0x65, 0x72, 0x12, 0x33, 0x0a, 0x07, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x18,
-	0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x19, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d,
-	0x6d, 0x6f, 0x6e, 0x2e, 0x6e, 0x65, 0x74, 0x2e, 0x45, 0x6e, 0x64, 0x70, 0x6f, 0x69, 0x6e, 0x74,
-	0x52, 0x07, 0x61, 0x64, 0x64, 0x72, 0x65, 0x73, 0x73, 0x12, 0x56, 0x0a, 0x12, 0x70, 0x72, 0x69,
-	0x6f, 0x72, 0x69, 0x74, 0x69, 0x7a, 0x65, 0x64, 0x5f, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x18,
-	0x02, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x27, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70,
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-	0x32, 0x16, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x72, 0x6f, 0x75, 0x74,
-	0x65, 0x72, 0x2e, 0x47, 0x65, 0x6f, 0x49, 0x50, 0x52, 0x05, 0x67, 0x65, 0x6f, 0x69, 0x70, 0x12,
-	0x4c, 0x0a, 0x0e, 0x6f, 0x72, 0x69, 0x67, 0x69, 0x6e, 0x61, 0x6c, 0x5f, 0x72, 0x75, 0x6c, 0x65,
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-	0x44, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x4d, 0x61, 0x74, 0x63, 0x68, 0x69, 0x6e, 0x67, 0x54, 0x79,
-	0x70, 0x65, 0x52, 0x04, 0x74, 0x79, 0x70, 0x65, 0x12, 0x16, 0x0a, 0x06, 0x64, 0x6f, 0x6d, 0x61,
-	0x69, 0x6e, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x06, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e,
-	0x12, 0x0e, 0x0a, 0x02, 0x69, 0x70, 0x18, 0x03, 0x20, 0x03, 0x28, 0x0c, 0x52, 0x02, 0x69, 0x70,
-	0x12, 0x25, 0x0a, 0x0e, 0x70, 0x72, 0x6f, 0x78, 0x69, 0x65, 0x64, 0x5f, 0x64, 0x6f, 0x6d, 0x61,
-	0x69, 0x6e, 0x18, 0x04, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0d, 0x70, 0x72, 0x6f, 0x78, 0x69, 0x65,
-	0x64, 0x44, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x2a, 0x45, 0x0a, 0x12, 0x44, 0x6f, 0x6d, 0x61, 0x69,
-	0x6e, 0x4d, 0x61, 0x74, 0x63, 0x68, 0x69, 0x6e, 0x67, 0x54, 0x79, 0x70, 0x65, 0x12, 0x08, 0x0a,
-	0x04, 0x46, 0x75, 0x6c, 0x6c, 0x10, 0x00, 0x12, 0x0d, 0x0a, 0x09, 0x53, 0x75, 0x62, 0x64, 0x6f,
-	0x6d, 0x61, 0x69, 0x6e, 0x10, 0x01, 0x12, 0x0b, 0x0a, 0x07, 0x4b, 0x65, 0x79, 0x77, 0x6f, 0x72,
-	0x64, 0x10, 0x02, 0x12, 0x09, 0x0a, 0x05, 0x52, 0x65, 0x67, 0x65, 0x78, 0x10, 0x03, 0x42, 0x46,
-	0x0a, 0x10, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x64,
-	0x6e, 0x73, 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, 0x64, 0x6e, 0x73, 0xaa, 0x02, 0x0c, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x41,
-	0x70, 0x70, 0x2e, 0x44, 0x6e, 0x73, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x06, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x12, 0x0e, 0x0a,
+	0x02, 0x69, 0x70, 0x18, 0x03, 0x20, 0x03, 0x28, 0x0c, 0x52, 0x02, 0x69, 0x70, 0x12, 0x25, 0x0a,
+	0x0e, 0x70, 0x72, 0x6f, 0x78, 0x69, 0x65, 0x64, 0x5f, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x18,
+	0x04, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0d, 0x70, 0x72, 0x6f, 0x78, 0x69, 0x65, 0x64, 0x44, 0x6f,
+	0x6d, 0x61, 0x69, 0x6e, 0x4a, 0x04, 0x08, 0x07, 0x10, 0x08, 0x2a, 0x35, 0x0a, 0x0d, 0x51, 0x75,
+	0x65, 0x72, 0x79, 0x53, 0x74, 0x72, 0x61, 0x74, 0x65, 0x67, 0x79, 0x12, 0x0a, 0x0a, 0x06, 0x55,
+	0x53, 0x45, 0x5f, 0x49, 0x50, 0x10, 0x00, 0x12, 0x0b, 0x0a, 0x07, 0x55, 0x53, 0x45, 0x5f, 0x49,
+	0x50, 0x34, 0x10, 0x01, 0x12, 0x0b, 0x0a, 0x07, 0x55, 0x53, 0x45, 0x5f, 0x49, 0x50, 0x36, 0x10,
+	0x02, 0x2a, 0x44, 0x0a, 0x0d, 0x43, 0x61, 0x63, 0x68, 0x65, 0x53, 0x74, 0x72, 0x61, 0x74, 0x65,
+	0x67, 0x79, 0x12, 0x0d, 0x0a, 0x09, 0x43, 0x61, 0x63, 0x68, 0x65, 0x5f, 0x41, 0x4c, 0x4c, 0x10,
+	0x00, 0x12, 0x11, 0x0a, 0x0d, 0x43, 0x61, 0x63, 0x68, 0x65, 0x5f, 0x4e, 0x4f, 0x45, 0x52, 0x52,
+	0x4f, 0x52, 0x10, 0x01, 0x12, 0x11, 0x0a, 0x0d, 0x43, 0x61, 0x63, 0x68, 0x65, 0x5f, 0x44, 0x49,
+	0x53, 0x41, 0x42, 0x4c, 0x45, 0x10, 0x02, 0x42, 0x46, 0x0a, 0x10, 0x63, 0x6f, 0x6d, 0x2e, 0x78,
+	0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x64, 0x6e, 0x73, 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, 0x64, 0x6e, 0x73,
+	0xaa, 0x02, 0x0c, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x41, 0x70, 0x70, 0x2e, 0x44, 0x6e, 0x73, 0x62,
+	0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -531,37 +575,40 @@ func file_app_dns_config_proto_rawDescGZIP() []byte {
 	return file_app_dns_config_proto_rawDescData
 }
 
-var file_app_dns_config_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
-var file_app_dns_config_proto_msgTypes = make([]protoimpl.MessageInfo, 6)
+var file_app_dns_config_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
+var file_app_dns_config_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
 var file_app_dns_config_proto_goTypes = []interface{}{
-	(DomainMatchingType)(0),           // 0: xray.app.dns.DomainMatchingType
-	(*NameServer)(nil),                // 1: xray.app.dns.NameServer
-	(*Config)(nil),                    // 2: xray.app.dns.Config
-	(*NameServer_PriorityDomain)(nil), // 3: xray.app.dns.NameServer.PriorityDomain
-	(*NameServer_OriginalRule)(nil),   // 4: xray.app.dns.NameServer.OriginalRule
-	nil,                               // 5: xray.app.dns.Config.HostsEntry
-	(*Config_HostMapping)(nil),        // 6: xray.app.dns.Config.HostMapping
-	(*net.Endpoint)(nil),              // 7: xray.common.net.Endpoint
-	(*router.GeoIP)(nil),              // 8: xray.app.router.GeoIP
-	(*net.IPOrDomain)(nil),            // 9: xray.common.net.IPOrDomain
+	(QueryStrategy)(0),              // 0: xray.app.dns.QueryStrategy
+	(CacheStrategy)(0),              // 1: xray.app.dns.CacheStrategy
+	(*NameServer)(nil),              // 2: xray.app.dns.NameServer
+	(*Config)(nil),                  // 3: xray.app.dns.Config
+	(*NameServer_OriginalRule)(nil), // 4: xray.app.dns.NameServer.OriginalRule
+	nil,                             // 5: xray.app.dns.Config.HostsEntry
+	(*Config_HostMapping)(nil),      // 6: xray.app.dns.Config.HostMapping
+	(*net.Endpoint)(nil),            // 7: xray.common.net.Endpoint
+	(*domain.Domain)(nil),           // 8: xray.common.matcher.domain.Domain
+	(*geoip.GeoIP)(nil),             // 9: xray.common.matcher.geoip.GeoIP
+	(*net.IPOrDomain)(nil),          // 10: xray.common.net.IPOrDomain
+	(domain.MatchingType)(0),        // 11: xray.common.matcher.domain.MatchingType
 }
 var file_app_dns_config_proto_depIdxs = []int32{
 	7,  // 0: xray.app.dns.NameServer.address:type_name -> xray.common.net.Endpoint
-	3,  // 1: xray.app.dns.NameServer.prioritized_domain:type_name -> xray.app.dns.NameServer.PriorityDomain
-	8,  // 2: xray.app.dns.NameServer.geoip:type_name -> xray.app.router.GeoIP
+	8,  // 1: xray.app.dns.NameServer.prioritized_domain:type_name -> xray.common.matcher.domain.Domain
+	9,  // 2: xray.app.dns.NameServer.geoip:type_name -> xray.common.matcher.geoip.GeoIP
 	4,  // 3: xray.app.dns.NameServer.original_rules:type_name -> xray.app.dns.NameServer.OriginalRule
 	7,  // 4: xray.app.dns.Config.NameServers:type_name -> xray.common.net.Endpoint
-	1,  // 5: xray.app.dns.Config.name_server:type_name -> xray.app.dns.NameServer
+	2,  // 5: xray.app.dns.Config.name_server:type_name -> xray.app.dns.NameServer
 	5,  // 6: xray.app.dns.Config.Hosts:type_name -> xray.app.dns.Config.HostsEntry
 	6,  // 7: xray.app.dns.Config.static_hosts:type_name -> xray.app.dns.Config.HostMapping
-	0,  // 8: xray.app.dns.NameServer.PriorityDomain.type:type_name -> xray.app.dns.DomainMatchingType
-	9,  // 9: xray.app.dns.Config.HostsEntry.value:type_name -> xray.common.net.IPOrDomain
-	0,  // 10: xray.app.dns.Config.HostMapping.type:type_name -> xray.app.dns.DomainMatchingType
-	11, // [11:11] is the sub-list for method output_type
-	11, // [11:11] is the sub-list for method input_type
-	11, // [11:11] is the sub-list for extension type_name
-	11, // [11:11] is the sub-list for extension extendee
-	0,  // [0:11] is the sub-list for field type_name
+	1,  // 8: xray.app.dns.Config.cache_strategy:type_name -> xray.app.dns.CacheStrategy
+	0,  // 9: xray.app.dns.Config.query_strategy:type_name -> xray.app.dns.QueryStrategy
+	10, // 10: xray.app.dns.Config.HostsEntry.value:type_name -> xray.common.net.IPOrDomain
+	11, // 11: xray.app.dns.Config.HostMapping.type:type_name -> xray.common.matcher.domain.MatchingType
+	12, // [12:12] is the sub-list for method output_type
+	12, // [12:12] is the sub-list for method input_type
+	12, // [12:12] is the sub-list for extension type_name
+	12, // [12:12] is the sub-list for extension extendee
+	0,  // [0:12] is the sub-list for field type_name
 }
 
 func init() { file_app_dns_config_proto_init() }
@@ -595,18 +642,6 @@ func file_app_dns_config_proto_init() {
 			}
 		}
 		file_app_dns_config_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*NameServer_PriorityDomain); i {
-			case 0:
-				return &v.state
-			case 1:
-				return &v.sizeCache
-			case 2:
-				return &v.unknownFields
-			default:
-				return nil
-			}
-		}
-		file_app_dns_config_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*NameServer_OriginalRule); i {
 			case 0:
 				return &v.state
@@ -618,7 +653,7 @@ func file_app_dns_config_proto_init() {
 				return nil
 			}
 		}
-		file_app_dns_config_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
+		file_app_dns_config_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Config_HostMapping); i {
 			case 0:
 				return &v.state
@@ -636,8 +671,8 @@ func file_app_dns_config_proto_init() {
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_app_dns_config_proto_rawDesc,
-			NumEnums:      1,
-			NumMessages:   6,
+			NumEnums:      2,
+			NumMessages:   5,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

app/dns/config.proto

@@ -8,31 +8,34 @@ option java_multiple_files = true;
 
 import "common/net/address.proto";
 import "common/net/destination.proto";
-import "app/router/config.proto";
+import "common/matcher/domain/domain.proto";
+import "common/matcher/geoip/geoip.proto";
 
 message NameServer {
   xray.common.net.Endpoint address = 1;
-
-  message PriorityDomain {
-    DomainMatchingType type = 1;
-    string domain = 2;
-  }
+  bytes client_ip = 5;
+  bool skipFallback = 6;
 
   message OriginalRule {
     string rule = 1;
     uint32 size = 2;
   }
 
-  repeated PriorityDomain prioritized_domain = 2;
-  repeated xray.app.router.GeoIP geoip = 3;
+  repeated xray.common.matcher.domain.Domain prioritized_domain = 2;
+  repeated xray.common.matcher.geoip.GeoIP geoip = 3;
   repeated OriginalRule original_rules = 4;
 }
 
-enum DomainMatchingType {
-  Full = 0;
-  Subdomain = 1;
-  Keyword = 2;
-  Regex = 3;
+enum QueryStrategy {
+  USE_IP = 0;
+  USE_IP4 = 1;
+  USE_IP6 = 2;
+}
+
+enum CacheStrategy {
+  Cache_ALL = 0;
+  Cache_NOERROR = 1;
+  Cache_DISABLE = 2;
 }
 
 message Config {
@@ -53,14 +56,13 @@ message Config {
   bytes client_ip = 3;
 
   message HostMapping {
-    DomainMatchingType type = 1;
+    xray.common.matcher.domain.MatchingType type = 1;
     string domain = 2;
 
     repeated bytes ip = 3;
 
     // ProxiedDomain indicates the mapped domain has the same IP address on this
-    // domain. Xray will use this domain for IP queries. This field is only
-    // effective if ip is empty.
+    // domain. Xray will use this domain for IP queries.
     string proxied_domain = 4;
   }
 
@@ -68,4 +70,13 @@ message Config {
 
   // Tag is the inbound tag of DNS client.
   string tag = 6;
+
+  reserved 7;
+
+  // DisableCache disables DNS cache
+  CacheStrategy cache_strategy = 8;
+
+  QueryStrategy query_strategy = 9;
+
+  bool disableFallback = 10;
 }

app/dns/dns.go

@@ -2,3 +2,296 @@
 package dns
 
 //go:generate go run github.com/xtls/xray-core/common/errors/errorgen
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"sync"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/matcher/geoip"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/features"
+	"github.com/xtls/xray-core/features/dns"
+)
+
+// DNS is a DNS rely server.
+type DNS struct {
+	sync.Mutex
+	tag             string
+	cacheStrategy   CacheStrategy
+	disableFallback bool
+	ipOption        *dns.IPOption
+	hosts           *StaticHosts
+	clients         []*Client
+	ctx             context.Context
+}
+
+// DomainMatcherInfo contains information attached to index returned by Server.domainMatcher
+type DomainMatcherInfo struct {
+	clientIdx     uint16
+	domainRuleIdx uint16
+}
+
+// New creates a new DNS server with given configuration.
+func New(ctx context.Context, config *Config) (*DNS, error) {
+	var tag string
+	if len(config.Tag) > 0 {
+		tag = config.Tag
+	} else {
+		tag = generateRandomTag()
+	}
+
+	var clientIP net.IP
+	switch len(config.ClientIp) {
+	case 0, net.IPv4len, net.IPv6len:
+		clientIP = net.IP(config.ClientIp)
+	default:
+		return nil, newError("unexpected client IP length ", len(config.ClientIp))
+	}
+
+	var ipOption *dns.IPOption
+	switch config.QueryStrategy {
+	case QueryStrategy_USE_IP:
+		ipOption = &dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: true,
+			FakeEnable: false,
+		}
+	case QueryStrategy_USE_IP4:
+		ipOption = &dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: false,
+			FakeEnable: false,
+		}
+	case QueryStrategy_USE_IP6:
+		ipOption = &dns.IPOption{
+			IPv4Enable: false,
+			IPv6Enable: true,
+			FakeEnable: false,
+		}
+	}
+
+	hosts, err := NewStaticHosts(config.StaticHosts, config.Hosts)
+	if err != nil {
+		return nil, newError("failed to create hosts").Base(err)
+	}
+
+	clients := []*Client{}
+	domainRuleCount := 0
+	for _, ns := range config.NameServer {
+		domainRuleCount += len(ns.PrioritizedDomain)
+	}
+
+	geoipContainer := geoip.GeoIPMatcherContainer{}
+
+	for _, endpoint := range config.NameServers {
+		features.PrintDeprecatedFeatureWarning("simple DNS server")
+		client, err := NewSimpleClient(ctx, endpoint, clientIP)
+		if err != nil {
+			return nil, newError("failed to create client").Base(err)
+		}
+		clients = append(clients, client)
+	}
+
+	for _, ns := range config.NameServer {
+
+		myClientIP := clientIP
+		switch len(ns.ClientIp) {
+		case net.IPv4len, net.IPv6len:
+			myClientIP = ns.ClientIp
+		}
+		client, err := NewClient(ctx, ns, myClientIP, geoipContainer)
+		if err != nil {
+			return nil, newError("failed to create client").Base(err)
+		}
+		clients = append(clients, client)
+	}
+
+	// If there is no DNS client in config, add a `localhost` DNS client
+	if len(clients) == 0 {
+		clients = append(clients, NewLocalDNSClient())
+	}
+
+	return &DNS{
+		tag:             tag,
+		hosts:           hosts,
+		ipOption:        ipOption,
+		clients:         clients,
+		ctx:             ctx,
+		cacheStrategy:   config.CacheStrategy,
+		disableFallback: config.DisableFallback,
+	}, nil
+}
+
+// Type implements common.HasType.
+func (*DNS) Type() interface{} {
+	return dns.ClientType()
+}
+
+// Start implements common.Runnable.
+func (s *DNS) Start() error {
+	return nil
+}
+
+// Close implements common.Closable.
+func (s *DNS) Close() error {
+	return nil
+}
+
+// IsOwnLink implements proxy.dns.ownLinkVerifier
+func (s *DNS) IsOwnLink(ctx context.Context) bool {
+	inbound := session.InboundFromContext(ctx)
+	return inbound != nil && inbound.Tag == s.tag
+}
+
+// LookupIP implements dns.Client.
+func (s *DNS) LookupIP(domain string) ([]net.IP, error) {
+	return s.lookupIPInternal(domain, s.ipOption.Copy())
+}
+
+// LookupOptions implements dns.Client.
+func (s *DNS) LookupOptions(domain string, opts ...dns.Option) ([]net.IP, error) {
+	opt := s.ipOption.Copy()
+	for _, o := range opts {
+		if o != nil {
+			o(opt)
+		}
+	}
+
+	return s.lookupIPInternal(domain, opt)
+}
+
+// LookupIPv4 implements dns.IPv4Lookup.
+func (s *DNS) LookupIPv4(domain string) ([]net.IP, error) {
+	return s.lookupIPInternal(domain, &dns.IPOption{
+		IPv4Enable: true,
+	})
+}
+
+// LookupIPv6 implements dns.IPv6Lookup.
+func (s *DNS) LookupIPv6(domain string) ([]net.IP, error) {
+	return s.lookupIPInternal(domain, &dns.IPOption{
+		IPv6Enable: true,
+	})
+}
+
+func (s *DNS) lookupIPInternal(domain string, option *dns.IPOption) ([]net.IP, error) {
+	if domain == "" {
+		return nil, newError("empty domain name")
+	}
+	if isQuery(option) {
+		return nil, newError("empty option: Impossible.").AtWarning()
+	}
+
+	// Normalize the FQDN form query
+	if strings.HasSuffix(domain, ".") {
+		domain = domain[:len(domain)-1]
+	}
+
+	// Static host lookup
+	switch addrs := s.hosts.Lookup(domain, option); {
+	case addrs == nil: // Domain not recorded in static host
+		break
+	case len(addrs) == 0: // Domain recorded, but no valid IP returned (e.g. IPv4 address with only IPv6 enabled)
+		return nil, dns.ErrEmptyResponse
+	case len(addrs) == 1 && addrs[0].Family().IsDomain(): // Domain replacement
+		newError("domain replaced: ", domain, " -> ", addrs[0].Domain()).WriteToLog()
+		domain = addrs[0].Domain()
+	default:
+		// Successfully found ip records in static host.
+		// Skip hosts mapping result in FakeDNS query.
+		if isIPQuery(option) {
+			newError("returning ", len(addrs), " IP(s) for domain ", domain, " -> ", addrs).WriteToLog()
+			return toNetIP(addrs)
+		}
+	}
+
+	// Name servers lookup
+	errs := []error{}
+	ctx := session.ContextWithInbound(s.ctx, &session.Inbound{Tag: s.tag})
+	for _, client := range s.sortClients(domain, option) {
+		ips, err := client.QueryIP(ctx, domain, *option, s.cacheStrategy)
+		if len(ips) > 0 {
+			return ips, nil
+		}
+		if err != nil {
+			newError("failed to lookup ip for domain ", domain, " at server ", client.Name()).Base(err).WriteToLog()
+			errs = append(errs, err)
+		}
+		if err != context.Canceled && err != context.DeadlineExceeded && err != errExpectedIPNonMatch {
+			return nil, err
+		}
+	}
+
+	return nil, newError("returning nil for domain ", domain).Base(errors.Combine(errs...))
+}
+
+func (s *DNS) sortClients(domain string, option *dns.IPOption) []*Client {
+	clients := make([]*Client, 0, len(s.clients))
+	clientUsed := make([]bool, len(s.clients))
+	clientNames := make([]string, 0, len(s.clients))
+	domainRules := []string{}
+
+	defer func() {
+		if len(domainRules) > 0 {
+			newError("domain ", domain, " matches following rules: ", domainRules).AtDebug().WriteToLog()
+		}
+		if len(clientNames) > 0 {
+			newError("domain ", domain, " will use DNS in order: ", clientNames).AtDebug().WriteToLog()
+		}
+		if len(clients) == 0 {
+			clients = append(clients, s.clients[0])
+			clientNames = append(clientNames, s.clients[0].Name())
+			newError("domain ", domain, " will use the first DNS: ", clientNames).AtDebug().WriteToLog()
+		}
+	}()
+
+	// Priority domain matching
+	for clientIdx, client := range s.clients {
+		if ids := client.domainMatcher.Match(domain); len(ids) > 0 {
+			if !canQueryOnClient(option, client) {
+				newError("skipping the client " + client.Name()).AtDebug().WriteToLog()
+				continue
+			}
+			for _, id := range ids {
+				rule := client.findRule(id)
+				domainRules = append(domainRules, fmt.Sprintf("%s(DNS idx:%d)", rule, clientIdx))
+			}
+			if clientUsed[clientIdx] {
+				continue
+			}
+			clients = append(clients, client)
+			clientNames = append(clientNames, client.Name())
+		}
+	}
+
+	if !s.disableFallback {
+		// Default round-robin query
+		for idx, client := range s.clients {
+			if clientUsed[idx] || client.skipFallback {
+				continue
+			}
+
+			if !canQueryOnClient(option, client) {
+				newError("skipping the client " + client.Name()).AtDebug().WriteToLog()
+				continue
+			}
+
+			clientUsed[idx] = true
+			clients = append(clients, client)
+			clientNames = append(clientNames, client.Name())
+		}
+	}
+
+	return clients
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		return New(ctx, config.(*Config))
+	}))
+}

app/dns/dns_test.go

@@ -12,8 +12,9 @@ import (
 	"github.com/xtls/xray-core/app/policy"
 	"github.com/xtls/xray-core/app/proxyman"
 	_ "github.com/xtls/xray-core/app/proxyman/outbound"
-	"github.com/xtls/xray-core/app/router"
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/matcher/domain"
+	"github.com/xtls/xray-core/common/matcher/geoip"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/serial"
 	"github.com/xtls/xray-core/core"
@@ -303,10 +304,10 @@ func TestPrioritizedDomain(t *testing.T) {
 							},
 							Port: uint32(port),
 						},
-						PrioritizedDomain: []*NameServer_PriorityDomain{
+						PrioritizedDomain: []*domain.Domain{
 							{
-								Type:   DomainMatchingType_Full,
-								Domain: "google.com",
+								Type:  domain.MatchingType_Full,
+								Value: "google.com",
 							},
 						},
 					},
@@ -391,7 +392,6 @@ func TestUDPServerIPv6(t *testing.T) {
 
 	client := v.GetFeature(feature_dns.ClientType()).(feature_dns.Client)
 	client6 := client.(feature_dns.IPv6Lookup)
-
 	{
 		ips, err := client6.LookupIPv6("ipv6.google.com")
 		if err != nil {
@@ -433,7 +433,7 @@ func TestStaticHostDomain(t *testing.T) {
 				},
 				StaticHosts: []*Config_HostMapping{
 					{
-						Type:          DomainMatchingType_Full,
+						Type:          domain.MatchingType_Full,
 						Domain:        "example.com",
 						ProxiedDomain: "google.com",
 					},
@@ -497,10 +497,10 @@ func TestIPMatch(t *testing.T) {
 							},
 							Port: uint32(port),
 						},
-						Geoip: []*router.GeoIP{
+						Geoip: []*geoip.GeoIP{
 							{
 								CountryCode: "local",
-								Cidr: []*router.CIDR{
+								Cidr: []*geoip.CIDR{
 									{
 										// inner ip, will not match
 										Ip:     []byte{192, 168, 11, 1},
@@ -521,10 +521,10 @@ func TestIPMatch(t *testing.T) {
 							},
 							Port: uint32(port),
 						},
-						Geoip: []*router.GeoIP{
+						Geoip: []*geoip.GeoIP{
 							{
 								CountryCode: "test",
-								Cidr: []*router.CIDR{
+								Cidr: []*geoip.CIDR{
 									{
 										Ip:     []byte{8, 8, 8, 8},
 										Prefix: 32,
@@ -533,7 +533,7 @@ func TestIPMatch(t *testing.T) {
 							},
 							{
 								CountryCode: "test",
-								Cidr: []*router.CIDR{
+								Cidr: []*geoip.CIDR{
 									{
 										Ip:     []byte{8, 8, 8, 4},
 										Prefix: 32,
@@ -617,14 +617,14 @@ func TestLocalDomain(t *testing.T) {
 							},
 							Port: uint32(port),
 						},
-						PrioritizedDomain: []*NameServer_PriorityDomain{
+						PrioritizedDomain: []*domain.Domain{
 							// Equivalent of dotless:localhost
-							{Type: DomainMatchingType_Regex, Domain: "^[^.]*localhost[^.]*$"},
+							{Type: domain.MatchingType_Regex, Value: "^[^.]*localhost[^.]*$"},
 						},
-						Geoip: []*router.GeoIP{
+						Geoip: []*geoip.GeoIP{
 							{ // Will match localhost, localhost-a and localhost-b,
 								CountryCode: "local",
-								Cidr: []*router.CIDR{
+								Cidr: []*geoip.CIDR{
 									{Ip: []byte{127, 0, 0, 2}, Prefix: 32},
 									{Ip: []byte{127, 0, 0, 3}, Prefix: 32},
 									{Ip: []byte{127, 0, 0, 4}, Prefix: 32},
@@ -642,22 +642,22 @@ func TestLocalDomain(t *testing.T) {
 							},
 							Port: uint32(port),
 						},
-						PrioritizedDomain: []*NameServer_PriorityDomain{
+						PrioritizedDomain: []*domain.Domain{
 							// Equivalent of dotless: and domain:local
-							{Type: DomainMatchingType_Regex, Domain: "^[^.]*$"},
-							{Type: DomainMatchingType_Subdomain, Domain: "local"},
-							{Type: DomainMatchingType_Subdomain, Domain: "localdomain"},
+							{Type: domain.MatchingType_Regex, Value: "^[^.]*$"},
+							{Type: domain.MatchingType_Subdomain, Value: "local"},
+							{Type: domain.MatchingType_Subdomain, Value: "localdomain"},
 						},
 					},
 				},
 				StaticHosts: []*Config_HostMapping{
 					{
-						Type:   DomainMatchingType_Full,
+						Type:   domain.MatchingType_Full,
 						Domain: "hostnamestatic",
 						Ip:     [][]byte{{127, 0, 0, 53}},
 					},
 					{
-						Type:          DomainMatchingType_Full,
+						Type:          domain.MatchingType_Full,
 						Domain:        "hostnamealias",
 						ProxiedDomain: "hostname.localdomain",
 					},
@@ -813,15 +813,15 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
 							},
 							Port: uint32(port),
 						},
-						PrioritizedDomain: []*NameServer_PriorityDomain{
+						PrioritizedDomain: []*domain.Domain{
 							{
-								Type:   DomainMatchingType_Subdomain,
-								Domain: "google.com",
+								Type:  domain.MatchingType_Subdomain,
+								Value: "google.com",
 							},
 						},
-						Geoip: []*router.GeoIP{
+						Geoip: []*geoip.GeoIP{
 							{ // Will only match 8.8.8.8 and 8.8.4.4
-								Cidr: []*router.CIDR{
+								Cidr: []*geoip.CIDR{
 									{Ip: []byte{8, 8, 8, 8}, Prefix: 32},
 									{Ip: []byte{8, 8, 4, 4}, Prefix: 32},
 								},
@@ -838,15 +838,15 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
 							},
 							Port: uint32(port),
 						},
-						PrioritizedDomain: []*NameServer_PriorityDomain{
+						PrioritizedDomain: []*domain.Domain{
 							{
-								Type:   DomainMatchingType_Subdomain,
-								Domain: "google.com",
+								Type:  domain.MatchingType_Subdomain,
+								Value: "google.com",
 							},
 						},
-						Geoip: []*router.GeoIP{
+						Geoip: []*geoip.GeoIP{
 							{ // Will match 8.8.8.8 and 8.8.8.7, etc
-								Cidr: []*router.CIDR{
+								Cidr: []*geoip.CIDR{
 									{Ip: []byte{8, 8, 8, 7}, Prefix: 24},
 								},
 							},
@@ -862,15 +862,15 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
 							},
 							Port: uint32(port),
 						},
-						PrioritizedDomain: []*NameServer_PriorityDomain{
+						PrioritizedDomain: []*domain.Domain{
 							{
-								Type:   DomainMatchingType_Subdomain,
-								Domain: "api.google.com",
+								Type:  domain.MatchingType_Subdomain,
+								Value: "api.google.com",
 							},
 						},
-						Geoip: []*router.GeoIP{
+						Geoip: []*geoip.GeoIP{
 							{ // Will only match 8.8.7.7 (api.google.com)
-								Cidr: []*router.CIDR{
+								Cidr: []*geoip.CIDR{
 									{Ip: []byte{8, 8, 7, 7}, Prefix: 32},
 								},
 							},
@@ -886,15 +886,15 @@ func TestMultiMatchPrioritizedDomain(t *testing.T) {
 							},
 							Port: uint32(port),
 						},
-						PrioritizedDomain: []*NameServer_PriorityDomain{
+						PrioritizedDomain: []*domain.Domain{
 							{
-								Type:   DomainMatchingType_Full,
-								Domain: "v2.api.google.com",
+								Type:  domain.MatchingType_Full,
+								Value: "v2.api.google.com",
 							},
 						},
-						Geoip: []*router.GeoIP{
+						Geoip: []*geoip.GeoIP{
 							{ // Will only match 8.8.7.8 (v2.api.google.com)
-								Cidr: []*router.CIDR{
+								Cidr: []*geoip.CIDR{
 									{Ip: []byte{8, 8, 7, 8}, Prefix: 32},
 								},
 							},

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/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

@@ -2,39 +2,21 @@ package dns
 
 import (
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/matcher/str"
 	"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.
 type StaticHosts struct {
 	ips      [][]net.Address
-	matchers *strmatcher.MatcherGroup
-}
-
-var typeMap = map[DomainMatchingType]strmatcher.Type{
-	DomainMatchingType_Full:      strmatcher.Full,
-	DomainMatchingType_Subdomain: strmatcher.Domain,
-	DomainMatchingType_Keyword:   strmatcher.Substr,
-	DomainMatchingType_Regex:     strmatcher.Regex,
-}
-
-func toStrMatcher(t DomainMatchingType, domain string) (strmatcher.Matcher, error) {
-	strMType, f := typeMap[t]
-	if !f {
-		return nil, newError("unknown mapping type", t).AtWarning()
-	}
-	matcher, err := strMType.New(domain)
-	if err != nil {
-		return nil, newError("failed to create str matcher").Base(err)
-	}
-	return matcher, nil
+	matchers *str.MatcherGroup
 }
 
 // NewStaticHosts creates a new StaticHosts instance.
 func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDomain) (*StaticHosts, error) {
-	g := new(strmatcher.MatcherGroup)
+	g := new(str.MatcherGroup)
 	sh := &StaticHosts{
 		ips:      make([][]net.Address, len(hosts)+len(legacy)+16),
 		matchers: g,
@@ -44,7 +26,7 @@ func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDoma
 		features.PrintDeprecatedFeatureWarning("simple host mapping")
 
 		for domain, ip := range legacy {
-			matcher, err := strmatcher.Full.New(domain)
+			matcher, err := str.Full.New(domain)
 			common.Must(err)
 			id := g.Add(matcher)
 
@@ -65,6 +47,9 @@ func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDoma
 		id := g.Add(matcher)
 		ips := make([]net.Address, 0, len(mapping.Ip)+1)
 		switch {
+		case len(mapping.ProxiedDomain) > 0:
+			ips = append(ips, net.DomainAddress(mapping.ProxiedDomain))
+
 		case len(mapping.Ip) > 0:
 			for _, ip := range mapping.Ip {
 				addr := net.IPAddress(ip)
@@ -74,49 +59,56 @@ func NewStaticHosts(hosts []*Config_HostMapping, legacy map[string]*net.IPOrDoma
 				ips = append(ips, addr)
 			}
 
-		case len(mapping.ProxiedDomain) > 0:
-			ips = append(ips, net.DomainAddress(mapping.ProxiedDomain))
-
 		default:
 			return nil, newError("neither IP address nor proxied domain specified for domain: ", mapping.Domain).AtWarning()
 		}
 
-		// Special handling for localhost IPv6. This is a dirty workaround as JSON config supports only single IP mapping.
-		if len(ips) == 1 && ips[0] == net.LocalHostIP {
-			ips = append(ips, net.LocalHostIPv6)
-		}
-
 		sh.ips[id] = ips
 	}
 
 	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) {
 			filtered = append(filtered, ip)
 		}
 	}
-	if len(filtered) == 0 {
-		return nil
-	}
 	return filtered
 }
 
-// LookupIP returns IP address for the given domain, if exists in this StaticHosts.
-func (h *StaticHosts) LookupIP(domain string, option IPOption) []net.Address {
-	indices := h.matchers.Match(domain)
-	if len(indices) == 0 {
-		return nil
-	}
-	ips := []net.Address{}
-	for _, id := range indices {
+func (h *StaticHosts) lookupInternal(domain string) []net.Address {
+	var ips []net.Address
+	for _, id := range h.matchers.Match(domain) {
 		ips = append(ips, h.ips[id]...)
 	}
 	if len(ips) == 1 && ips[0].Family().IsDomain() {
 		return ips
 	}
-	return filterIP(ips, option)
+	return ips
+}
+
+func (h *StaticHosts) lookup(domain string, option *dns.IPOption, maxDepth int) []net.Address {
+	switch addrs := h.lookupInternal(domain); {
+	case len(addrs) == 0: // Not recorded in static hosts, return nil
+		return nil
+	case len(addrs) == 1 && addrs[0].Family().IsDomain(): // Try to unwrap domain
+		newError("found replaced domain: ", domain, " -> ", addrs[0].Domain(), ". Try to unwrap it").AtDebug().WriteToLog()
+		if maxDepth > 0 {
+			unwrapped := h.lookup(addrs[0].Domain(), option, maxDepth-1)
+			if unwrapped != nil {
+				return unwrapped
+			}
+		}
+		return addrs
+	default: // IP record found, return a non-nil IP array
+		return filterIP(addrs, option)
+	}
+}
+
+// Lookup returns IP addresses or proxied domain for the given domain, if exists in this StaticHosts.
+func (h *StaticHosts) Lookup(domain string, option *dns.IPOption) []net.Address {
+	return h.lookup(domain, option, 5)
 }

app/dns/hosts_test.go

@@ -7,30 +7,47 @@ import (
 
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/matcher/domain"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/features/dns"
 )
 
 func TestStaticHosts(t *testing.T) {
 	pb := []*Config_HostMapping{
 		{
-			Type:   DomainMatchingType_Full,
+			Type:   domain.MatchingType_Full,
 			Domain: "example.com",
 			Ip: [][]byte{
 				{1, 1, 1, 1},
 			},
 		},
 		{
-			Type:   DomainMatchingType_Subdomain,
+			Type:   domain.MatchingType_Full,
+			Domain: "proxy.example.com",
+			Ip: [][]byte{
+				{1, 2, 3, 4},
+				{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
+			},
+			ProxiedDomain: "another-proxy.example.com",
+		},
+		{
+			Type:          domain.MatchingType_Full,
+			Domain:        "proxy2.example.com",
+			ProxiedDomain: "proxy.example.com",
+		},
+		{
+			Type:   domain.MatchingType_Subdomain,
 			Domain: "example.cn",
 			Ip: [][]byte{
 				{2, 2, 2, 2},
 			},
 		},
 		{
-			Type:   DomainMatchingType_Subdomain,
+			Type:   domain.MatchingType_Subdomain,
 			Domain: "baidu.com",
 			Ip: [][]byte{
 				{127, 0, 0, 1},
+				{0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1},
 			},
 		},
 	}
@@ -39,7 +56,7 @@ func TestStaticHosts(t *testing.T) {
 	common.Must(err)
 
 	{
-		ips := hosts.LookupIP("example.com", IPOption{
+		ips := hosts.Lookup("example.com", &dns.IPOption{
 			IPv4Enable: true,
 			IPv6Enable: true,
 		})
@@ -52,7 +69,33 @@ func TestStaticHosts(t *testing.T) {
 	}
 
 	{
-		ips := hosts.LookupIP("www.example.cn", IPOption{
+		domain := hosts.Lookup("proxy.example.com", &dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: false,
+		})
+		if len(domain) != 1 {
+			t.Error("expect 1 domain, but got ", len(domain))
+		}
+		if diff := cmp.Diff(domain[0].Domain(), "another-proxy.example.com"); diff != "" {
+			t.Error(diff)
+		}
+	}
+
+	{
+		domain := hosts.Lookup("proxy2.example.com", &dns.IPOption{
+			IPv4Enable: true,
+			IPv6Enable: false,
+		})
+		if len(domain) != 1 {
+			t.Error("expect 1 domain, but got ", len(domain))
+		}
+		if diff := cmp.Diff(domain[0].Domain(), "another-proxy.example.com"); diff != "" {
+			t.Error(diff)
+		}
+	}
+
+	{
+		ips := hosts.Lookup("www.example.cn", &dns.IPOption{
 			IPv4Enable: true,
 			IPv6Enable: true,
 		})
@@ -65,7 +108,7 @@ func TestStaticHosts(t *testing.T) {
 	}
 
 	{
-		ips := hosts.LookupIP("baidu.com", IPOption{
+		ips := hosts.Lookup("baidu.com", &dns.IPOption{
 			IPv4Enable: false,
 			IPv6Enable: true,
 		})

app/dns/nameserver.go

@@ -2,53 +2,207 @@ package dns
 
 import (
 	"context"
+	"net/url"
+	"strings"
+	"time"
 
+	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/matcher/geoip"
+	"github.com/xtls/xray-core/common/matcher/str"
 	"github.com/xtls/xray-core/common/net"
-	"github.com/xtls/xray-core/features/dns/localdns"
+	core "github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features/dns"
+	"github.com/xtls/xray-core/features/routing"
 )
 
-// IPOption is an object for IP query options.
-type IPOption struct {
-	IPv4Enable bool
-	IPv6Enable bool
+// Server is the interface for Name Server.
+type Server interface {
+	// Name of the Client.
+	Name() string
+	// QueryIP sends IP queries to its configured server.
+	QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns.IPOption, cs CacheStrategy) ([]net.IP, error)
 }
 
 // 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)
+type Client struct {
+	server        Server
+	clientIP      net.IP
+	skipFallback  bool
+	expectIPs     []*geoip.GeoIPMatcher
+	domainMatcher str.MatcherGroup
+	originRules   []*NameServer_OriginalRule
 }
 
-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)
+func (c Client) findRule(idx uint32) string {
+	for _, r := range c.originRules {
+		if idx <= r.Size {
+			return r.Rule
+		}
+		idx -= r.Size
 	}
 
-	if option.IPv4Enable {
-		return s.client.LookupIPv4(domain)
-	}
-
-	if option.IPv6Enable {
-		return s.client.LookupIPv6(domain)
-	}
-
-	return nil, newError("neither IPv4 nor IPv6 is enabled")
+	return "unknown rule"
 }
 
-func (s *LocalNameServer) Name() string {
-	return "localhost"
+var errExpectedIPNonMatch = errors.New("expectIPs not match")
+
+// NewServer creates a name server object according to the network destination url.
+func NewServer(dest net.Destination, dispatcher routing.Dispatcher) (Server, error) {
+	if address := dest.Address; address.Family().IsDomain() {
+		u, err := url.Parse(address.Domain())
+		if err != nil {
+			return nil, err
+		}
+		switch {
+		case strings.EqualFold(u.String(), "localhost"):
+			return NewLocalNameServer(), nil
+		case strings.EqualFold(u.Scheme, "https"): // DOH Remote mode
+			return NewDoHNameServer(u, dispatcher)
+		case strings.EqualFold(u.Scheme, "https+local"): // DOH Local mode
+			return NewDoHLocalNameServer(u), nil
+		case strings.EqualFold(u.Scheme, "quic+local"): // DNS-over-QUIC Local mode
+			return NewQUICNameServer(u)
+		case strings.EqualFold(u.String(), "fakedns"):
+			return NewFakeDNSServer(), nil
+		}
+	}
+	if dest.Network == net.Network_Unknown {
+		dest.Network = net.Network_UDP
+	}
+	if dest.Network == net.Network_UDP { // UDP classic DNS mode
+		return NewClassicNameServer(dest, dispatcher), nil
+	}
+	return nil, newError("No available name server could be created from ", dest).AtWarning()
 }
 
-func NewLocalNameServer() *LocalNameServer {
-	newError("DNS: created localhost client").AtInfo().WriteToLog()
-	return &LocalNameServer{
-		client: localdns.New(),
-	}
+// NewClient creates a DNS client managing a name server with client IP, domain rules and expected IPs.
+func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container geoip.GeoIPMatcherContainer) (*Client, error) {
+	client := &Client{}
+
+	err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error {
+		// Create a new server for each client for now
+		server, err := NewServer(ns.Address.AsDestination(), dispatcher)
+		if err != nil {
+			return newError("failed to create nameserver").Base(err).AtWarning()
+		}
+
+		// Priotize local domains with specific TLDs or without any dot to local DNS
+		if _, isLocalDNS := server.(*LocalNameServer); isLocalDNS {
+			ns.PrioritizedDomain = append(ns.PrioritizedDomain, localTLDsAndDotlessDomains...)
+			ns.OriginalRules = append(ns.OriginalRules, localTLDsAndDotlessDomainsRule)
+			// The following lines is a solution to avoid core panics（rule index out of range） when setting `localhost` DNS client in config.
+			// Because the `localhost` DNS client will append len(localTLDsAndDotlessDomains) rules into matcherInfos to match `geosite:private` default rule.
+			// But `matcherInfos` has no enough length to add rules, which leads to core panics (rule index out of range).
+			// To avoid this, the length of `matcherInfos` must be equal to the expected, so manually append it with Golang default zero value first for later modification.
+			// ;)
+			/*
+				for i := 0; i < len(localTLDsAndDotlessDomains); i++ {
+					*matcherInfos = append(*matcherInfos, DomainMatcherInfo{
+						clientIdx:     uint16(0),
+						domainRuleIdx: uint16(0),
+					})
+				}
+			*/
+		}
+
+		// Establish domain rules
+		var domainMatcher = str.MatcherGroup{}
+		for _, domain := range ns.PrioritizedDomain {
+			domainRule, err := toStrMatcher(domain.Type, domain.Value)
+			if err != nil {
+				return newError("failed to create prioritized domain").Base(err).AtWarning()
+			}
+			domainMatcher.Add(domainRule)
+		}
+
+		// Establish expected IPs
+		var ipMatchers []*geoip.GeoIPMatcher
+		for _, geoip := range ns.Geoip {
+			matcher, err := container.Add(geoip)
+			if err != nil {
+				return newError("failed to create ip matcher").Base(err).AtWarning()
+			}
+			ipMatchers = append(ipMatchers, matcher)
+		}
+
+		if len(clientIP) > 0 {
+			switch ns.Address.Address.GetAddress().(type) {
+			case *net.IPOrDomain_Domain:
+				newError("DNS: client ", ns.Address.Address.GetDomain(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
+			case *net.IPOrDomain_Ip:
+				newError("DNS: client ", ns.Address.Address.GetIp(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
+			}
+		}
+
+		client.server = server
+		client.clientIP = clientIP
+		client.expectIPs = ipMatchers
+		client.originRules = ns.OriginalRules
+		client.domainMatcher = domainMatcher
+		return nil
+	})
+	return client, err
+}
+
+// NewSimpleClient creates a DNS client with a simple destination.
+func NewSimpleClient(ctx context.Context, endpoint *net.Endpoint, clientIP net.IP) (*Client, error) {
+	client := &Client{}
+	err := core.RequireFeatures(ctx, func(dispatcher routing.Dispatcher) error {
+		server, err := NewServer(endpoint.AsDestination(), dispatcher)
+		if err != nil {
+			return newError("failed to create nameserver").Base(err).AtWarning()
+		}
+		client.server = server
+		client.clientIP = clientIP
+		return nil
+	})
+
+	if len(clientIP) > 0 {
+		switch endpoint.Address.GetAddress().(type) {
+		case *net.IPOrDomain_Domain:
+			newError("DNS: client ", endpoint.Address.GetDomain(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
+		case *net.IPOrDomain_Ip:
+			newError("DNS: client ", endpoint.Address.GetIp(), " uses clientIP ", clientIP.String()).AtInfo().WriteToLog()
+		}
+	}
+
+	return client, err
+}
+
+// Name returns the server name the client manages.
+func (c *Client) Name() string {
+	return c.server.Name()
+}
+
+// QueryIP send DNS query to the name server with the client's IP.
+func (c *Client) QueryIP(ctx context.Context, domain string, option dns.IPOption, cs CacheStrategy) ([]net.IP, error) {
+	ctx, cancel := context.WithTimeout(ctx, 4*time.Second)
+	ips, err := c.server.QueryIP(ctx, domain, c.clientIP, option, cs)
+	cancel()
+
+	if err != nil {
+		return ips, err
+	}
+	return c.MatchExpectedIPs(domain, ips)
+}
+
+// MatchExpectedIPs matches queried domain IPs with expected IPs and returns matched ones.
+func (c *Client) MatchExpectedIPs(domain string, ips []net.IP) ([]net.IP, error) {
+	if len(c.expectIPs) == 0 {
+		return ips, nil
+	}
+	newIps := []net.IP{}
+	for _, ip := range ips {
+		for _, matcher := range c.expectIPs {
+			if matcher.Match(ip) {
+				newIps = append(newIps, ip)
+				break
+			}
+		}
+	}
+	if len(newIps) == 0 {
+		return nil, errExpectedIPNonMatch
+	}
+	newError("domain ", domain, " expectIPs ", newIps, " matched at server ", c.Name()).AtDebug().WriteToLog()
+	return newIps, nil
 }

app/dns/nameserver_doh.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"
@@ -41,20 +42,77 @@ type DoHNameServer struct {
 	name       string
 }
 
-// NewDoHNameServer creates DOH client object for remote resolving
-func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, clientIP net.IP) (*DoHNameServer, error) {
+// NewDoHNameServer creates DOH server object for remote resolving
+func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher) (*DoHNameServer, error) {
 	newError("DNS: created Remote DOH client for ", url.String()).AtInfo().WriteToLog()
-	s := baseDOHNameServer(url, "DOH", clientIP)
+	s := baseDOHNameServer(url, "DOH")
 
 	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.ContentFromContext(ctx))
+			dispatcherCtx = session.ContextWithInbound(dispatcherCtx, session.InboundFromContext(ctx))
+			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
+			}
+			log.Record(&log.AccessMessage{
+				From:   "DoH",
+				To:     s.dohURL,
+				Status: log.AccessAccepted,
+				Detour: "local",
+			})
+
+			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
 }
 
 // NewDoHLocalNameServer creates DOH client object for local resolving
-func NewDoHLocalNameServer(url *url.URL, clientIP net.IP) *DoHNameServer {
+func NewDoHLocalNameServer(url *url.URL) *DoHNameServer {
 	url.Scheme = "https"
-	s := baseDOHNameServer(url, "DOHL", clientIP)
+	s := baseDOHNameServer(url, "DOHL")
 	tr := &http.Transport{
 		IdleConnTimeout:   90 * time.Second,
 		ForceAttemptHTTP2: true,
@@ -64,6 +122,12 @@ 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
 			}
@@ -78,13 +142,12 @@ func NewDoHLocalNameServer(url *url.URL, clientIP net.IP) *DoHNameServer {
 	return s
 }
 
-func baseDOHNameServer(url *url.URL, prefix string, clientIP net.IP) *DoHNameServer {
+func baseDOHNameServer(url *url.URL, prefix string) *DoHNameServer {
 	s := &DoHNameServer{
-		ips:      make(map[string]record),
-		clientIP: clientIP,
-		pub:      pubsub.NewService(),
-		name:     prefix + "//" + url.Host,
-		dohURL:   url.String(),
+		ips:    make(map[string]record),
+		pub:    pubsub.NewService(),
+		name:   prefix + "//" + url.Host,
+		dohURL: url.String(),
 	}
 	s.cleanup = &task.Periodic{
 		Interval: time.Minute,
@@ -94,7 +157,7 @@ func baseDOHNameServer(url *url.URL, prefix string, clientIP net.IP) *DoHNameSer
 	return s
 }
 
-// Name returns client name
+// Name implements Server.
 func (s *DoHNameServer) Name() string {
 	return s.name
 }
@@ -177,7 +240,7 @@ 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, clientIP net.IP, option dns_feature.IPOption) {
 	newError(s.name, " querying: ", domain).AtInfo().WriteToLog(session.ExportIDToError(ctx))
 
 	if s.name+"." == "DOH//"+domain {
@@ -185,7 +248,7 @@ func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, option IPO
 		return
 	}
 
-	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(s.clientIP))
+	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(clientIP))
 
 	var deadline time.Time
 	if d, ok := ctx.Deadline(); ok {
@@ -206,8 +269,8 @@ func (s *DoHNameServer) sendQuery(ctx context.Context, domain string, option IPO
 			}
 
 			dnsCtx = session.ContextWithContent(dnsCtx, &session.Content{
-				Protocol: "https",
-				//SkipRoutePick: true,
+				Protocol:       "https",
+				SkipDNSResolve: true,
 			})
 
 			// forced to use mux for DOH
@@ -249,41 +312,6 @@ 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 +326,7 @@ 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()
@@ -326,7 +354,7 @@ func (s *DoHNameServer) findIPsForDomain(domain string, option IPOption) ([]net.
 	}
 
 	if len(ips) > 0 {
-		return toNetIP(ips), nil
+		return toNetIP(ips)
 	}
 
 	if lastErr != nil {
@@ -340,14 +368,21 @@ func (s *DoHNameServer) findIPsForDomain(domain string, option IPOption) ([]net.
 	return nil, errRecordNotFound
 }
 
-// QueryIP is called from dns.Server->queryIPTimeout
-func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, option IPOption) ([]net.IP, error) {
+// QueryIP implements Server.
+func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption, cs CacheStrategy) ([]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()
-		return ips, err
+	if cs == CacheStrategy_Cache_DISABLE {
+		newError("DNS cache is disabled. Querying IP for ", domain, " at ", s.name).AtDebug().WriteToLog()
+	} else {
+		ips, err := s.findIPsForDomain(fqdn, option)
+		if err != errRecordNotFound {
+			if cs == CacheStrategy_Cache_NOERROR && err == nil {
+				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
+			}
+		}
 	}
 
 	// ipv4 and ipv6 belong to different subscription groups
@@ -376,11 +411,13 @@ func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, option IPOpt
 		}
 		close(done)
 	}()
-	s.sendQuery(ctx, fqdn, option)
+	s.sendQuery(ctx, fqdn, clientIP, 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/nameserver_doh_test.go

@@ -0,0 +1,60 @@
+package dns_test
+
+import (
+	"context"
+	"net/url"
+	"testing"
+	"time"
+
+	"github.com/google/go-cmp/cmp"
+
+	. "github.com/xtls/xray-core/app/dns"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	dns_feature "github.com/xtls/xray-core/features/dns"
+)
+
+func TestDOHNameServer(t *testing.T) {
+	url, err := url.Parse("https+local://1.1.1.1/dns-query")
+	common.Must(err)
+
+	s := NewDoHLocalNameServer(url)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+	}, CacheStrategy_Cache_ALL)
+	cancel()
+	common.Must(err)
+	if len(ips) == 0 {
+		t.Error("expect some ips, but got 0")
+	}
+}
+
+func TestDOHNameServerWithCache(t *testing.T) {
+	url, err := url.Parse("https+local://1.1.1.1/dns-query")
+	common.Must(err)
+
+	s := NewDoHLocalNameServer(url)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+	}, CacheStrategy_Cache_ALL)
+	cancel()
+	common.Must(err)
+	if len(ips) == 0 {
+		t.Error("expect some ips, but got 0")
+	}
+
+	ctx2, cancel := context.WithTimeout(context.Background(), time.Second*2)
+	ips2, err := s.QueryIP(ctx2, "google.com", net.IP(nil), dns_feature.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+	}, CacheStrategy_Cache_ALL)
+	cancel()
+	common.Must(err)
+	if r := cmp.Diff(ips2, ips); r != "" {
+		t.Fatal(r)
+	}
+}

app/dns/nameserver_fakedns.go

@@ -0,0 +1,43 @@
+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{}
+}
+
+const FakeDNSName = "FakeDNS"
+
+func (FakeDNSServer) Name() string {
+	return FakeDNSName
+}
+
+func (f *FakeDNSServer) QueryIP(ctx context.Context, domain string, _ net.IP, _ dns.IPOption, _ CacheStrategy) ([]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, err := toNetIP(ips)
+	if err != nil {
+		return nil, newError("Unable to convert IP to net ip").Base(err).AtError()
+	}
+
+	newError(f.Name(), " got answer: ", domain, " -> ", ips).AtInfo().WriteToLog()
+
+	return netIP, nil
+}

app/dns/nameserver_local.go

@@ -0,0 +1,53 @@
+package dns
+
+import (
+	"context"
+
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/features/dns"
+	"github.com/xtls/xray-core/features/dns/localdns"
+)
+
+// LocalNameServer is an wrapper over local DNS feature.
+type LocalNameServer struct {
+	client *localdns.Client
+}
+
+// QueryIP implements Server.
+func (s *LocalNameServer) QueryIP(_ context.Context, domain string, _ net.IP, option dns.IPOption, _ CacheStrategy) ([]net.IP, error) {
+	var ips []net.IP
+	var err error
+
+	switch {
+	case option.IPv4Enable && option.IPv6Enable:
+		ips, err = s.client.LookupIP(domain)
+	case option.IPv4Enable:
+		ips, err = s.client.LookupIPv4(domain)
+	case option.IPv6Enable:
+		ips, err = s.client.LookupIPv6(domain)
+	}
+
+	if len(ips) > 0 {
+		newError("Localhost got answer: ", domain, " -> ", ips).AtInfo().WriteToLog()
+	}
+
+	return ips, err
+}
+
+// Name implements Server.
+func (s *LocalNameServer) Name() string {
+	return "localhost"
+}
+
+// NewLocalNameServer creates localdns server object for directly lookup in system DNS.
+func NewLocalNameServer() *LocalNameServer {
+	newError("DNS: created localhost client").AtInfo().WriteToLog()
+	return &LocalNameServer{
+		client: localdns.New(),
+	}
+}
+
+// NewLocalDNSClient creates localdns client object for directly lookup in system DNS.
+func NewLocalDNSClient() *Client {
+	return &Client{server: NewLocalNameServer()}
+}

app/dns/nameserver_local_test.go

@@ -7,15 +7,17 @@ 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 TestLocalNameServer(t *testing.T) {
 	s := NewLocalNameServer()
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
-	ips, err := s.QueryIP(ctx, "google.com", IPOption{
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+	ips, err := s.QueryIP(ctx, "google.com", net.IP{}, dns.IPOption{
 		IPv4Enable: true,
 		IPv6Enable: true,
-	})
+	}, CacheStrategy_Cache_ALL)
 	cancel()
 	common.Must(err)
 	if len(ips) == 0 {

app/dns/nameserver_quic.go

@@ -0,0 +1,394 @@
+package dns
+
+import (
+	"context"
+	"net/url"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/lucas-clemente/quic-go"
+	"golang.org/x/net/dns/dnsmessage"
+	"golang.org/x/net/http2"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/buf"
+	"github.com/xtls/xray-core/common/log"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/protocol/dns"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/common/signal/pubsub"
+	"github.com/xtls/xray-core/common/task"
+	dns_feature "github.com/xtls/xray-core/features/dns"
+	"github.com/xtls/xray-core/transport/internet/tls"
+)
+
+// NextProtoDQ - During connection establishment, DNS/QUIC support is indicated
+// by selecting the ALPN token "dq" in the crypto handshake.
+const NextProtoDQ = "doq-i00"
+
+// QUICNameServer implemented DNS over QUIC
+type QUICNameServer struct {
+	sync.RWMutex
+	ips         map[string]record
+	pub         *pubsub.Service
+	cleanup     *task.Periodic
+	reqID       uint32
+	name        string
+	destination net.Destination
+	session     quic.Session
+}
+
+// NewQUICNameServer creates DNS-over-QUIC client object for local resolving
+func NewQUICNameServer(url *url.URL) (*QUICNameServer, error) {
+	newError("DNS: created Local DNS-over-QUIC client for ", url.String()).AtInfo().WriteToLog()
+
+	var err error
+	port := net.Port(784)
+	if url.Port() != "" {
+		port, err = net.PortFromString(url.Port())
+		if err != nil {
+			return nil, err
+		}
+	}
+	dest := net.UDPDestination(net.DomainAddress(url.Hostname()), port)
+
+	s := &QUICNameServer{
+		ips:         make(map[string]record),
+		pub:         pubsub.NewService(),
+		name:        url.String(),
+		destination: dest,
+	}
+	s.cleanup = &task.Periodic{
+		Interval: time.Minute,
+		Execute:  s.Cleanup,
+	}
+
+	return s, nil
+}
+
+// Name returns client name
+func (s *QUICNameServer) Name() string {
+	return s.name
+}
+
+// Cleanup clears expired items from cache
+func (s *QUICNameServer) Cleanup() error {
+	now := time.Now()
+	s.Lock()
+	defer s.Unlock()
+
+	if len(s.ips) == 0 {
+		return newError("nothing to do. stopping...")
+	}
+
+	for domain, record := range s.ips {
+		if record.A != nil && record.A.Expire.Before(now) {
+			record.A = nil
+		}
+		if record.AAAA != nil && record.AAAA.Expire.Before(now) {
+			record.AAAA = nil
+		}
+
+		if record.A == nil && record.AAAA == nil {
+			newError(s.name, " cleanup ", domain).AtDebug().WriteToLog()
+			delete(s.ips, domain)
+		} else {
+			s.ips[domain] = record
+		}
+	}
+
+	if len(s.ips) == 0 {
+		s.ips = make(map[string]record)
+	}
+
+	return nil
+}
+
+func (s *QUICNameServer) updateIP(req *dnsRequest, ipRec *IPRecord) {
+	elapsed := time.Since(req.start)
+
+	s.Lock()
+	rec := s.ips[req.domain]
+	updated := false
+
+	switch req.reqType {
+	case dnsmessage.TypeA:
+		if isNewer(rec.A, ipRec) {
+			rec.A = ipRec
+			updated = true
+		}
+	case dnsmessage.TypeAAAA:
+		addr := make([]net.Address, 0)
+		for _, ip := range ipRec.IP {
+			if len(ip.IP()) == net.IPv6len {
+				addr = append(addr, ip)
+			}
+		}
+		ipRec.IP = addr
+		if isNewer(rec.AAAA, ipRec) {
+			rec.AAAA = ipRec
+			updated = true
+		}
+	}
+	newError(s.name, " got answer: ", req.domain, " ", req.reqType, " -> ", ipRec.IP, " ", elapsed).AtInfo().WriteToLog()
+
+	if updated {
+		s.ips[req.domain] = rec
+	}
+	switch req.reqType {
+	case dnsmessage.TypeA:
+		s.pub.Publish(req.domain+"4", nil)
+	case dnsmessage.TypeAAAA:
+		s.pub.Publish(req.domain+"6", nil)
+	}
+	s.Unlock()
+	common.Must(s.cleanup.Start())
+}
+
+func (s *QUICNameServer) newReqID() uint16 {
+	return uint16(atomic.AddUint32(&s.reqID, 1))
+}
+
+func (s *QUICNameServer) sendQuery(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption) {
+	newError(s.name, " querying: ", domain).AtInfo().WriteToLog(session.ExportIDToError(ctx))
+
+	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(clientIP))
+
+	var deadline time.Time
+	if d, ok := ctx.Deadline(); ok {
+		deadline = d
+	} else {
+		deadline = time.Now().Add(time.Second * 5)
+	}
+
+	for _, req := range reqs {
+		go func(r *dnsRequest) {
+			// generate new context for each req, using same context
+			// may cause reqs all aborted if any one encounter an error
+			dnsCtx := context.Background()
+
+			// reserve internal dns server requested Inbound
+			if inbound := session.InboundFromContext(ctx); inbound != nil {
+				dnsCtx = session.ContextWithInbound(dnsCtx, inbound)
+			}
+			dnsCtx = session.ContextWithContent(dnsCtx, &session.Content{
+				Protocol:       "quic",
+				SkipDNSResolve: true,
+			})
+			dnsCtx = log.ContextWithAccessMessage(dnsCtx, &log.AccessMessage{
+				From:   "DoQ",
+				To:     s.name,
+				Status: log.AccessAccepted,
+				Reason: "",
+			})
+
+			var cancel context.CancelFunc
+			dnsCtx, cancel = context.WithDeadline(dnsCtx, deadline)
+			defer cancel()
+
+			b, err := dns.PackMessage(r.msg)
+			if err != nil {
+				newError("failed to pack dns query").Base(err).AtError().WriteToLog()
+				return
+			}
+
+			conn, err := s.openStream(dnsCtx)
+			if err != nil {
+				newError("failed to open quic session").Base(err).AtError().WriteToLog()
+				return
+			}
+
+			_, err = conn.Write(b.Bytes())
+			if err != nil {
+				newError("failed to send query").Base(err).AtError().WriteToLog()
+				return
+			}
+
+			_ = conn.Close()
+
+			respBuf := buf.New()
+			defer respBuf.Release()
+			n, err := respBuf.ReadFrom(conn)
+			if err != nil && n == 0 {
+				newError("failed to read response").Base(err).AtError().WriteToLog()
+				return
+			}
+
+			rec, err := parseResponse(respBuf.Bytes())
+			if err != nil {
+				newError("failed to handle response").Base(err).AtError().WriteToLog()
+				return
+			}
+			s.updateIP(r, rec)
+		}(req)
+	}
+}
+
+func (s *QUICNameServer) findIPsForDomain(domain string, option dns_feature.IPOption) ([]net.IP, error) {
+	s.RLock()
+	record, found := s.ips[domain]
+	s.RUnlock()
+
+	if !found {
+		return nil, errRecordNotFound
+	}
+
+	var ips []net.Address
+	var lastErr error
+	if option.IPv6Enable && record.AAAA != nil && record.AAAA.RCode == dnsmessage.RCodeSuccess {
+		aaaa, err := record.AAAA.getIPs()
+		if err != nil {
+			lastErr = err
+		}
+		ips = append(ips, aaaa...)
+	}
+
+	if option.IPv4Enable && record.A != nil && record.A.RCode == dnsmessage.RCodeSuccess {
+		a, err := record.A.getIPs()
+		if err != nil {
+			lastErr = err
+		}
+		ips = append(ips, a...)
+	}
+
+	if len(ips) > 0 {
+		return toNetIP(ips)
+	}
+
+	if lastErr != nil {
+		return nil, lastErr
+	}
+
+	if (option.IPv4Enable && record.A != nil) || (option.IPv6Enable && record.AAAA != nil) {
+		return nil, dns_feature.ErrEmptyResponse
+	}
+
+	return nil, errRecordNotFound
+}
+
+// QueryIP is called from dns.Server->queryIPTimeout
+func (s *QUICNameServer) QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption, cs CacheStrategy) ([]net.IP, error) {
+	fqdn := Fqdn(domain)
+
+	if cs == CacheStrategy_Cache_DISABLE {
+		newError("DNS cache is disabled. Querying IP for ", domain, " at ", s.name).AtDebug().WriteToLog()
+	} else {
+		ips, err := s.findIPsForDomain(fqdn, option)
+		if err != errRecordNotFound {
+			if cs == CacheStrategy_Cache_NOERROR && err == nil {
+				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
+			}
+		}
+	}
+
+	// ipv4 and ipv6 belong to different subscription groups
+	var sub4, sub6 *pubsub.Subscriber
+	if option.IPv4Enable {
+		sub4 = s.pub.Subscribe(fqdn + "4")
+		defer sub4.Close()
+	}
+	if option.IPv6Enable {
+		sub6 = s.pub.Subscribe(fqdn + "6")
+		defer sub6.Close()
+	}
+	done := make(chan interface{})
+	go func() {
+		if sub4 != nil {
+			select {
+			case <-sub4.Wait():
+			case <-ctx.Done():
+			}
+		}
+		if sub6 != nil {
+			select {
+			case <-sub6.Wait():
+			case <-ctx.Done():
+			}
+		}
+		close(done)
+	}()
+	s.sendQuery(ctx, fqdn, clientIP, 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
+		}
+
+		select {
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		case <-done:
+		}
+	}
+}
+
+func isActive(s quic.Session) bool {
+	select {
+	case <-s.Context().Done():
+		return false
+	default:
+		return true
+	}
+}
+
+func (s *QUICNameServer) getSession() (quic.Session, error) {
+	var session quic.Session
+	s.RLock()
+	session = s.session
+	if session != nil && isActive(session) {
+		s.RUnlock()
+		return session, nil
+	}
+	if session != nil {
+		// we're recreating the session, let's create a new one
+		_ = session.CloseWithError(0, "")
+	}
+	s.RUnlock()
+
+	s.Lock()
+	defer s.Unlock()
+
+	var err error
+	session, err = s.openSession()
+	if err != nil {
+		// This does not look too nice, but QUIC (or maybe quic-go)
+		// doesn't seem stable enough.
+		// Maybe retransmissions aren't fully implemented in quic-go?
+		// Anyways, the simple solution is to make a second try when
+		// it fails to open the QUIC session.
+		session, err = s.openSession()
+		if err != nil {
+			return nil, err
+		}
+	}
+	s.session = session
+	return session, nil
+}
+
+func (s *QUICNameServer) openSession() (quic.Session, error) {
+	tlsConfig := tls.Config{}
+	quicConfig := &quic.Config{}
+
+	session, err := quic.DialAddrContext(context.Background(), s.destination.NetAddr(), tlsConfig.GetTLSConfig(tls.WithNextProto("http/1.1", http2.NextProtoTLS, NextProtoDQ)), quicConfig)
+	if err != nil {
+		return nil, err
+	}
+
+	return session, nil
+}
+
+func (s *QUICNameServer) openStream(ctx context.Context) (quic.Stream, error) {
+	session, err := s.getSession()
+	if err != nil {
+		return nil, err
+	}
+
+	// open a new stream
+	return session.OpenStreamSync(ctx)
+}

app/dns/nameserver_quic_test.go

@@ -0,0 +1,60 @@
+package dns_test
+
+import (
+	"context"
+	"net/url"
+	"testing"
+	"time"
+
+	"github.com/google/go-cmp/cmp"
+
+	. "github.com/xtls/xray-core/app/dns"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	dns_feature "github.com/xtls/xray-core/features/dns"
+)
+
+func TestQUICNameServer(t *testing.T) {
+	url, err := url.Parse("quic://dns.adguard.com")
+	common.Must(err)
+	s, err := NewQUICNameServer(url)
+	common.Must(err)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+	}, CacheStrategy_Cache_ALL)
+	cancel()
+	common.Must(err)
+	if len(ips) == 0 {
+		t.Error("expect some ips, but got 0")
+	}
+}
+
+func TestQUICNameServerWithCache(t *testing.T) {
+	url, err := url.Parse("quic://dns.adguard.com")
+	common.Must(err)
+	s, err := NewQUICNameServer(url)
+	common.Must(err)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
+	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+	}, CacheStrategy_Cache_ALL)
+	cancel()
+	common.Must(err)
+	if len(ips) == 0 {
+		t.Error("expect some ips, but got 0")
+	}
+
+	ctx2, cancel := context.WithTimeout(context.Background(), time.Second*5)
+	ips2, err := s.QueryIP(ctx2, "google.com", net.IP(nil), dns_feature.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+	}, CacheStrategy_Cache_ALL)
+	cancel()
+	common.Must(err)
+	if r := cmp.Diff(ips2, ips); r != "" {
+		t.Fatal(r)
+	}
+}

app/dns/nameserver_udp.go

@@ -8,6 +8,7 @@ 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/protocol/dns"
 	udp_proto "github.com/xtls/xray-core/common/protocol/udp"
@@ -30,10 +31,10 @@ type ClassicNameServer struct {
 	udpServer *udp.Dispatcher
 	cleanup   *task.Periodic
 	reqID     uint32
-	clientIP  net.IP
 }
 
-func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher, clientIP net.IP) *ClassicNameServer {
+// NewClassicNameServer creates udp server object for remote resolving.
+func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher) *ClassicNameServer {
 	// default to 53 if unspecific
 	if address.Port == 0 {
 		address.Port = net.Port(53)
@@ -43,7 +44,6 @@ func NewClassicNameServer(address net.Destination, dispatcher routing.Dispatcher
 		address:  address,
 		ips:      make(map[string]record),
 		requests: make(map[uint16]dnsRequest),
-		clientIP: clientIP,
 		pub:      pubsub.NewService(),
 		name:     strings.ToUpper(address.String()),
 	}
@@ -52,14 +52,16 @@ 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
 }
 
+// Name implements Server.
 func (s *ClassicNameServer) Name() string {
 	return s.name
 }
 
+// Cleanup clears expired items from cache
 func (s *ClassicNameServer) Cleanup() error {
 	now := time.Now()
 	s.Lock()
@@ -101,6 +103,7 @@ func (s *ClassicNameServer) Cleanup() error {
 	return nil
 }
 
+// HandleResponse handles udp response packet from remote DNS server.
 func (s *ClassicNameServer) HandleResponse(ctx context.Context, packet *udp_proto.Packet) {
 	ipRec, err := parseResponse(packet.Payload.Bytes())
 	if err != nil {
@@ -178,10 +181,10 @@ 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, clientIP net.IP, 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))
+	reqs := buildReqMsgs(domain, option, s.newReqID, genEDNS0Options(clientIP))
 
 	for _, req := range reqs {
 		s.addPendingRequest(req)
@@ -193,11 +196,17 @@ func (s *ClassicNameServer) sendQuery(ctx context.Context, domain string, option
 		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()
@@ -225,7 +234,7 @@ func (s *ClassicNameServer) findIPsForDomain(domain string, option IPOption) ([]
 	}
 
 	if len(ips) > 0 {
-		return toNetIP(ips), nil
+		return toNetIP(ips)
 	}
 
 	if lastErr != nil {
@@ -235,13 +244,21 @@ 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, clientIP net.IP, option dns_feature.IPOption, cs CacheStrategy) ([]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()
-		return ips, err
+	if cs == CacheStrategy_Cache_DISABLE {
+		newError("DNS cache is disabled. Querying IP for ", domain, " at ", s.name).AtDebug().WriteToLog()
+	} else {
+		ips, err := s.findIPsForDomain(fqdn, option)
+		if err != errRecordNotFound {
+			if cs == CacheStrategy_Cache_NOERROR && err == nil {
+				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
+			}
+		}
 	}
 
 	// ipv4 and ipv6 belong to different subscription groups
@@ -270,11 +287,13 @@ func (s *ClassicNameServer) QueryIP(ctx context.Context, domain string, option I
 		}
 		close(done)
 	}()
-	s.sendQuery(ctx, fqdn, option)
+	s.sendQuery(ctx, fqdn, clientIP, 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/options.go

@@ -0,0 +1,16 @@
+package dns
+
+import "github.com/xtls/xray-core/features/dns"
+
+func isIPQuery(o *dns.IPOption) bool {
+	return o.IPv4Enable || o.IPv6Enable
+}
+
+func canQueryOnClient(o *dns.IPOption, c *Client) bool {
+	isIPClient := !(c.Name() == FakeDNSName)
+	return isIPClient && isIPQuery(o)
+}
+
+func isQuery(o *dns.IPOption) bool {
+	return !(o.IPv4Enable || o.IPv6Enable || o.FakeEnable)
+}

app/dns/server.go

@@ -1,448 +0,0 @@
-package dns
-
-//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
-
-import (
-	"context"
-	"fmt"
-	"log"
-	"net/url"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/xtls/xray-core/app/router"
-	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/errors"
-	"github.com/xtls/xray-core/common/net"
-	"github.com/xtls/xray-core/common/session"
-	"github.com/xtls/xray-core/common/strmatcher"
-	"github.com/xtls/xray-core/common/uuid"
-	core "github.com/xtls/xray-core/core"
-	"github.com/xtls/xray-core/features"
-	"github.com/xtls/xray-core/features/dns"
-	"github.com/xtls/xray-core/features/routing"
-)
-
-// Server is a DNS rely server.
-type Server struct {
-	sync.Mutex
-	hosts         *StaticHosts
-	clientIP      net.IP
-	clients       []Client             // clientIdx -> Client
-	ipIndexMap    []*MultiGeoIPMatcher // clientIdx -> *MultiGeoIPMatcher
-	domainRules   [][]string           // clientIdx -> domainRuleIdx -> DomainRule
-	domainMatcher strmatcher.IndexMatcher
-	matcherInfos  []DomainMatcherInfo // matcherIdx -> DomainMatcherInfo
-	tag           string
-}
-
-// DomainMatcherInfo contains information attached to index returned by Server.domainMatcher
-type DomainMatcherInfo struct {
-	clientIdx     uint16
-	domainRuleIdx uint16
-}
-
-// MultiGeoIPMatcher for match
-type MultiGeoIPMatcher struct {
-	matchers []*router.GeoIPMatcher
-}
-
-var errExpectedIPNonMatch = errors.New("expectIPs not match")
-
-// Match check ip match
-func (c *MultiGeoIPMatcher) Match(ip net.IP) bool {
-	for _, matcher := range c.matchers {
-		if matcher.Match(ip) {
-			return true
-		}
-	}
-	return false
-}
-
-// HasMatcher check has matcher
-func (c *MultiGeoIPMatcher) HasMatcher() bool {
-	return len(c.matchers) > 0
-}
-
-func generateRandomTag() string {
-	id := uuid.New()
-	return "xray.system." + id.String()
-}
-
-// New creates a new DNS server with given configuration.
-func New(ctx context.Context, config *Config) (*Server, error) {
-	server := &Server{
-		clients: make([]Client, 0, len(config.NameServers)+len(config.NameServer)),
-		tag:     config.Tag,
-	}
-	if server.tag == "" {
-		server.tag = generateRandomTag()
-	}
-	if len(config.ClientIp) > 0 {
-		if len(config.ClientIp) != net.IPv4len && len(config.ClientIp) != net.IPv6len {
-			return nil, newError("unexpected IP length", len(config.ClientIp))
-		}
-		server.clientIP = net.IP(config.ClientIp)
-	}
-
-	hosts, err := NewStaticHosts(config.StaticHosts, config.Hosts)
-	if err != nil {
-		return nil, newError("failed to create hosts").Base(err)
-	}
-	server.hosts = hosts
-
-	addNameServer := func(ns *NameServer) int {
-		endpoint := ns.Address
-		address := endpoint.Address.AsAddress()
-
-		switch {
-		case address.Family().IsDomain() && address.Domain() == "localhost":
-			server.clients = append(server.clients, NewLocalNameServer())
-			// Priotize local domains with specific TLDs or without any dot to local DNS
-			// References:
-			// https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml
-			// https://unix.stackexchange.com/questions/92441/whats-the-difference-between-local-home-and-lan
-			localTLDsAndDotlessDomains := []*NameServer_PriorityDomain{
-				{Type: DomainMatchingType_Regex, Domain: "^[^.]+$"}, // This will only match domains without any dot
-				{Type: DomainMatchingType_Subdomain, Domain: "local"},
-				{Type: DomainMatchingType_Subdomain, Domain: "localdomain"},
-				{Type: DomainMatchingType_Subdomain, Domain: "localhost"},
-				{Type: DomainMatchingType_Subdomain, Domain: "lan"},
-				{Type: DomainMatchingType_Subdomain, Domain: "home.arpa"},
-				{Type: DomainMatchingType_Subdomain, Domain: "example"},
-				{Type: DomainMatchingType_Subdomain, Domain: "invalid"},
-				{Type: DomainMatchingType_Subdomain, Domain: "test"},
-			}
-			ns.PrioritizedDomain = append(ns.PrioritizedDomain, localTLDsAndDotlessDomains...)
-
-		case address.Family().IsDomain() && strings.HasPrefix(address.Domain(), "https+local://"):
-			// URI schemed string treated as domain
-			// DOH Local mode
-			u, err := url.Parse(address.Domain())
-			if err != nil {
-				log.Fatalln(newError("DNS config error").Base(err))
-			}
-			server.clients = append(server.clients, NewDoHLocalNameServer(u, server.clientIP))
-
-		case address.Family().IsDomain() && strings.HasPrefix(address.Domain(), "https://"):
-			// DOH Remote mode
-			u, err := url.Parse(address.Domain())
-			if err != nil {
-				log.Fatalln(newError("DNS config error").Base(err))
-			}
-			idx := len(server.clients)
-			server.clients = append(server.clients, nil)
-
-			// need the core dispatcher, register DOHClient at callback
-			common.Must(core.RequireFeatures(ctx, func(d routing.Dispatcher) {
-				c, err := NewDoHNameServer(u, d, server.clientIP)
-				if err != nil {
-					log.Fatalln(newError("DNS config error").Base(err))
-				}
-				server.clients[idx] = c
-			}))
-
-		default:
-			// UDP classic DNS mode
-			dest := endpoint.AsDestination()
-			if dest.Network == net.Network_Unknown {
-				dest.Network = net.Network_UDP
-			}
-			if dest.Network == net.Network_UDP {
-				idx := len(server.clients)
-				server.clients = append(server.clients, nil)
-
-				common.Must(core.RequireFeatures(ctx, func(d routing.Dispatcher) {
-					server.clients[idx] = NewClassicNameServer(dest, d, server.clientIP)
-				}))
-			}
-		}
-		server.ipIndexMap = append(server.ipIndexMap, nil)
-		return len(server.clients) - 1
-	}
-
-	if len(config.NameServers) > 0 {
-		features.PrintDeprecatedFeatureWarning("simple DNS server")
-		for _, destPB := range config.NameServers {
-			addNameServer(&NameServer{Address: destPB})
-		}
-	}
-
-	if len(config.NameServer) > 0 {
-		clientIndices := []int{}
-		domainRuleCount := 0
-		for _, ns := range config.NameServer {
-			idx := addNameServer(ns)
-			clientIndices = append(clientIndices, idx)
-			domainRuleCount += len(ns.PrioritizedDomain)
-		}
-
-		domainRules := make([][]string, len(server.clients))
-		domainMatcher := &strmatcher.MatcherGroup{}
-		matcherInfos := make([]DomainMatcherInfo, domainRuleCount+1) // matcher index starts from 1
-		var geoIPMatcherContainer router.GeoIPMatcherContainer
-		for nidx, ns := range config.NameServer {
-			idx := clientIndices[nidx]
-
-			// Establish domain rule matcher
-			rules := []string{}
-			ruleCurr := 0
-			ruleIter := 0
-			for _, domain := range ns.PrioritizedDomain {
-				matcher, err := toStrMatcher(domain.Type, domain.Domain)
-				if err != nil {
-					return nil, newError("failed to create prioritized domain").Base(err).AtWarning()
-				}
-				midx := domainMatcher.Add(matcher)
-				if midx >= uint32(len(matcherInfos)) { // This rarely happens according to current matcher's implementation
-					newError("expanding domain matcher info array to size ", midx, " when adding ", matcher).AtDebug().WriteToLog()
-					matcherInfos = append(matcherInfos, make([]DomainMatcherInfo, midx-uint32(len(matcherInfos))+1)...)
-				}
-				info := &matcherInfos[midx]
-				info.clientIdx = uint16(idx)
-				if ruleCurr < len(ns.OriginalRules) {
-					info.domainRuleIdx = uint16(ruleCurr)
-					rule := ns.OriginalRules[ruleCurr]
-					if ruleCurr >= len(rules) {
-						rules = append(rules, rule.Rule)
-					}
-					ruleIter++
-					if ruleIter >= int(rule.Size) {
-						ruleIter = 0
-						ruleCurr++
-					}
-				} else { // No original rule, generate one according to current domain matcher (majorly for compatibility with tests)
-					info.domainRuleIdx = uint16(len(rules))
-					rules = append(rules, matcher.String())
-				}
-			}
-			domainRules[idx] = rules
-
-			// only add to ipIndexMap if GeoIP is configured
-			if len(ns.Geoip) > 0 {
-				var matchers []*router.GeoIPMatcher
-				for _, geoip := range ns.Geoip {
-					matcher, err := geoIPMatcherContainer.Add(geoip)
-					if err != nil {
-						return nil, newError("failed to create ip matcher").Base(err).AtWarning()
-					}
-					matchers = append(matchers, matcher)
-				}
-				matcher := &MultiGeoIPMatcher{matchers: matchers}
-				server.ipIndexMap[idx] = matcher
-			}
-		}
-		server.domainRules = domainRules
-		server.domainMatcher = domainMatcher
-		server.matcherInfos = matcherInfos
-	}
-
-	if len(server.clients) == 0 {
-		server.clients = append(server.clients, NewLocalNameServer())
-		server.ipIndexMap = append(server.ipIndexMap, nil)
-	}
-
-	return server, nil
-}
-
-// Type implements common.HasType.
-func (*Server) Type() interface{} {
-	return dns.ClientType()
-}
-
-// Start implements common.Runnable.
-func (s *Server) Start() error {
-	return nil
-}
-
-// Close implements common.Closable.
-func (s *Server) Close() error {
-	return nil
-}
-
-func (s *Server) IsOwnLink(ctx context.Context) bool {
-	inbound := session.InboundFromContext(ctx)
-	return inbound != nil && inbound.Tag == s.tag
-}
-
-// Match check dns ip match geoip
-func (s *Server) Match(idx int, client Client, domain string, ips []net.IP) ([]net.IP, error) {
-	var matcher *MultiGeoIPMatcher
-	if idx < len(s.ipIndexMap) {
-		matcher = s.ipIndexMap[idx]
-	}
-	if matcher == nil {
-		return ips, nil
-	}
-
-	if !matcher.HasMatcher() {
-		newError("domain ", domain, " server has no valid matcher: ", client.Name(), " idx:", idx).AtDebug().WriteToLog()
-		return ips, nil
-	}
-
-	newIps := []net.IP{}
-	for _, ip := range ips {
-		if matcher.Match(ip) {
-			newIps = append(newIps, ip)
-		}
-	}
-	if len(newIps) == 0 {
-		return nil, errExpectedIPNonMatch
-	}
-	newError("domain ", domain, " expectIPs ", newIps, " matched at server ", client.Name(), " idx:", idx).AtDebug().WriteToLog()
-	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)
-	if len(s.tag) > 0 {
-		ctx = session.ContextWithInbound(ctx, &session.Inbound{
-			Tag: s.tag,
-		})
-	}
-	ips, err := client.QueryIP(ctx, domain, option)
-	cancel()
-
-	if err != nil {
-		return ips, err
-	}
-
-	ips, err = s.Match(idx, client, domain, ips)
-	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 {
-	ips := s.hosts.LookupIP(domain, option)
-	if ips == nil {
-		return nil
-	}
-	if ips[0].Family().IsDomain() && depth < 5 {
-		if newIPs := s.lookupStatic(ips[0].Domain(), option, depth+1); newIPs != nil {
-			return newIPs
-		}
-	}
-	return ips
-}
-
-func toNetIP(ips []net.Address) []net.IP {
-	if len(ips) == 0 {
-		return nil
-	}
-	netips := make([]net.IP, 0, len(ips))
-	for _, ip := range ips {
-		netips = append(netips, ip.IP())
-	}
-	return netips
-}
-
-func (s *Server) lookupIPInternal(domain string, option 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] == '.' {
-		domain = domain[:len(domain)-1]
-	}
-
-	ips := s.lookupStatic(domain, option, 0)
-	if ips != nil && ips[0].Family().IsIP() {
-		newError("returning ", len(ips), " IPs for domain ", domain).WriteToLog()
-		return toNetIP(ips), nil
-	}
-
-	if ips != nil && ips[0].Family().IsDomain() {
-		newdomain := ips[0].Domain()
-		newError("domain replaced: ", domain, " -> ", newdomain).WriteToLog()
-		domain = newdomain
-	}
-
-	var lastErr error
-	var matchedClient Client
-	if s.domainMatcher != nil {
-		indices := s.domainMatcher.Match(domain)
-		domainRules := []string{}
-		matchingDNS := []string{}
-		for _, idx := range indices {
-			info := s.matcherInfos[idx]
-			rule := s.domainRules[info.clientIdx][info.domainRuleIdx]
-			domainRules = append(domainRules, fmt.Sprintf("%s(DNS idx:%d)", rule, info.clientIdx))
-			matchingDNS = append(matchingDNS, s.clients[info.clientIdx].Name())
-		}
-		if len(domainRules) > 0 {
-			newError("domain ", domain, " matches following rules: ", domainRules).AtDebug().WriteToLog()
-		}
-		if len(matchingDNS) > 0 {
-			newError("domain ", domain, " uses following DNS first: ", matchingDNS).AtDebug().WriteToLog()
-		}
-		for _, idx := range indices {
-			clientIdx := int(s.matcherInfos[idx].clientIdx)
-			matchedClient = s.clients[clientIdx]
-			ips, err := s.queryIPTimeout(clientIdx, matchedClient, domain, option)
-			if len(ips) > 0 {
-				return ips, nil
-			}
-			if err == dns.ErrEmptyResponse {
-				return nil, err
-			}
-			if err != nil {
-				newError("failed to lookup ip for domain ", domain, " at server ", matchedClient.Name()).Base(err).WriteToLog()
-				lastErr = err
-			}
-		}
-	}
-
-	for idx, client := range s.clients {
-		if client == matchedClient {
-			newError("domain ", domain, " at server ", client.Name(), " idx:", idx, " already lookup failed, just ignore").AtDebug().WriteToLog()
-			continue
-		}
-
-		ips, err := s.queryIPTimeout(idx, client, domain, option)
-		if len(ips) > 0 {
-			return ips, nil
-		}
-
-		if err != nil {
-			newError("failed to lookup ip for domain ", domain, " at server ", client.Name()).Base(err).WriteToLog()
-			lastErr = err
-		}
-		if err != context.Canceled && err != context.DeadlineExceeded && err != errExpectedIPNonMatch {
-			return nil, err
-		}
-	}
-
-	return nil, newError("returning nil for domain ", domain).Base(lastErr)
-}
-
-func init() {
-	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
-		return New(ctx, config.(*Config))
-	}))
-}

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.go

@@ -1,5 +1,12 @@
 package proxyman
 
+import (
+	"github.com/xtls/xray-core/common/matcher/domain"
+	"github.com/xtls/xray-core/common/matcher/geoip"
+)
+
+//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
+
 func (s *AllocationStrategy) GetConcurrencyValue() uint32 {
 	if s == nil || s.Concurrency == nil {
 		return 3
@@ -37,3 +44,32 @@ func (c *ReceiverConfig) GetEffectiveSniffingSettings() *SniffingConfig {
 
 	return nil
 }
+
+type SniffingMatcher struct {
+	ExDomain *domain.DomainMatcher
+	ExIP     *geoip.MultiGeoIPMatcher
+}
+
+func NewSniffingMatcher(sc *SniffingConfig) (*SniffingMatcher, error) {
+	m := new(SniffingMatcher)
+
+	if sc == nil {
+		return m, nil
+	}
+
+	if sc.DomainsExcluded != nil {
+		exDomain, err := domain.NewDomainMatcher(sc.DomainsExcluded)
+		if err != nil {
+			return nil, newError("failed to parse domain").Base(err)
+		}
+		m.ExDomain = exDomain
+	}
+	if sc.IpsExcluded != nil {
+		exIP, err := geoip.NewMultiGeoIPMatcher(sc.IpsExcluded, true)
+		if err != nil {
+			return nil, newError("failed to parse ip").Base(err)
+		}
+		m.ExIP = exIP
+	}
+	return m, nil
+}

app/proxyman/config.pb.go

@@ -1,13 +1,15 @@
 // 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: app/proxyman/config.proto
 
 package proxyman
 
 import (
 	proto "github.com/golang/protobuf/proto"
+	domain "github.com/xtls/xray-core/common/matcher/domain"
+	geoip "github.com/xtls/xray-core/common/matcher/geoip"
 	net "github.com/xtls/xray-core/common/net"
 	serial "github.com/xtls/xray-core/common/serial"
 	internet "github.com/xtls/xray-core/transport/internet"
@@ -239,9 +241,13 @@ 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".
-	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"`
+	// Supported values are "http", "tls", "fakedns".
+	DestinationOverride []string         `protobuf:"bytes,2,rep,name=destination_override,json=destinationOverride,proto3" json:"destination_override,omitempty"`
+	DomainsExcluded     []*domain.Domain `protobuf:"bytes,3,rep,name=domains_excluded,json=domainsExcluded,proto3" json:"domains_excluded,omitempty"`
+	IpsExcluded         []*geoip.GeoIP   `protobuf:"bytes,5,rep,name=ips_excluded,json=ipsExcluded,proto3" json:"ips_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() {
@@ -290,13 +296,27 @@ func (x *SniffingConfig) GetDestinationOverride() []string {
 	return nil
 }
 
-func (x *SniffingConfig) GetDomainsExcluded() []string {
+func (x *SniffingConfig) GetDomainsExcluded() []*domain.Domain {
 	if x != nil {
 		return x.DomainsExcluded
 	}
 	return nil
 }
 
+func (x *SniffingConfig) GetIpsExcluded() []*geoip.GeoIP {
+	if x != nil {
+		return x.IpsExcluded
+	}
+	return nil
+}
+
+func (x *SniffingConfig) GetMetadataOnly() bool {
+	if x != nil {
+		return x.MetadataOnly
+	}
+	return false
+}
+
 type ReceiverConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -728,131 +748,144 @@ var File_app_proxyman_config_proto protoreflect.FileDescriptor
 var file_app_proxyman_config_proto_rawDesc = []byte{
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+	0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -882,33 +915,37 @@ var file_app_proxyman_config_proto_goTypes = []interface{}{
 	(*MultiplexingConfig)(nil),                               // 9: xray.app.proxyman.MultiplexingConfig
 	(*AllocationStrategy_AllocationStrategyConcurrency)(nil), // 10: xray.app.proxyman.AllocationStrategy.AllocationStrategyConcurrency
 	(*AllocationStrategy_AllocationStrategyRefresh)(nil),     // 11: xray.app.proxyman.AllocationStrategy.AllocationStrategyRefresh
-	(*net.PortRange)(nil),                                    // 12: xray.common.net.PortRange
-	(*net.IPOrDomain)(nil),                                   // 13: xray.common.net.IPOrDomain
-	(*internet.StreamConfig)(nil),                            // 14: xray.transport.internet.StreamConfig
-	(*serial.TypedMessage)(nil),                              // 15: xray.common.serial.TypedMessage
-	(*internet.ProxyConfig)(nil),                             // 16: xray.transport.internet.ProxyConfig
+	(*domain.Domain)(nil),                                    // 12: xray.common.matcher.domain.Domain
+	(*geoip.GeoIP)(nil),                                      // 13: xray.common.matcher.geoip.GeoIP
+	(*net.PortRange)(nil),                                    // 14: xray.common.net.PortRange
+	(*net.IPOrDomain)(nil),                                   // 15: xray.common.net.IPOrDomain
+	(*internet.StreamConfig)(nil),                            // 16: xray.transport.internet.StreamConfig
+	(*serial.TypedMessage)(nil),                              // 17: xray.common.serial.TypedMessage
+	(*internet.ProxyConfig)(nil),                             // 18: xray.transport.internet.ProxyConfig
 }
 var file_app_proxyman_config_proto_depIdxs = []int32{
 	1,  // 0: xray.app.proxyman.AllocationStrategy.type:type_name -> xray.app.proxyman.AllocationStrategy.Type
 	10, // 1: xray.app.proxyman.AllocationStrategy.concurrency:type_name -> xray.app.proxyman.AllocationStrategy.AllocationStrategyConcurrency
 	11, // 2: xray.app.proxyman.AllocationStrategy.refresh:type_name -> xray.app.proxyman.AllocationStrategy.AllocationStrategyRefresh
-	12, // 3: xray.app.proxyman.ReceiverConfig.port_range:type_name -> xray.common.net.PortRange
-	13, // 4: xray.app.proxyman.ReceiverConfig.listen:type_name -> xray.common.net.IPOrDomain
-	3,  // 5: xray.app.proxyman.ReceiverConfig.allocation_strategy:type_name -> xray.app.proxyman.AllocationStrategy
-	14, // 6: xray.app.proxyman.ReceiverConfig.stream_settings:type_name -> xray.transport.internet.StreamConfig
-	0,  // 7: xray.app.proxyman.ReceiverConfig.domain_override:type_name -> xray.app.proxyman.KnownProtocols
-	4,  // 8: xray.app.proxyman.ReceiverConfig.sniffing_settings:type_name -> xray.app.proxyman.SniffingConfig
-	15, // 9: xray.app.proxyman.InboundHandlerConfig.receiver_settings:type_name -> xray.common.serial.TypedMessage
-	15, // 10: xray.app.proxyman.InboundHandlerConfig.proxy_settings:type_name -> xray.common.serial.TypedMessage
-	13, // 11: xray.app.proxyman.SenderConfig.via:type_name -> xray.common.net.IPOrDomain
-	14, // 12: xray.app.proxyman.SenderConfig.stream_settings:type_name -> xray.transport.internet.StreamConfig
-	16, // 13: xray.app.proxyman.SenderConfig.proxy_settings:type_name -> xray.transport.internet.ProxyConfig
-	9,  // 14: xray.app.proxyman.SenderConfig.multiplex_settings:type_name -> xray.app.proxyman.MultiplexingConfig
-	15, // [15:15] is the sub-list for method output_type
-	15, // [15:15] is the sub-list for method input_type
-	15, // [15:15] is the sub-list for extension type_name
-	15, // [15:15] is the sub-list for extension extendee
-	0,  // [0:15] is the sub-list for field type_name
+	12, // 3: xray.app.proxyman.SniffingConfig.domains_excluded:type_name -> xray.common.matcher.domain.Domain
+	13, // 4: xray.app.proxyman.SniffingConfig.ips_excluded:type_name -> xray.common.matcher.geoip.GeoIP
+	14, // 5: xray.app.proxyman.ReceiverConfig.port_range:type_name -> xray.common.net.PortRange
+	15, // 6: xray.app.proxyman.ReceiverConfig.listen:type_name -> xray.common.net.IPOrDomain
+	3,  // 7: xray.app.proxyman.ReceiverConfig.allocation_strategy:type_name -> xray.app.proxyman.AllocationStrategy
+	16, // 8: xray.app.proxyman.ReceiverConfig.stream_settings:type_name -> xray.transport.internet.StreamConfig
+	0,  // 9: xray.app.proxyman.ReceiverConfig.domain_override:type_name -> xray.app.proxyman.KnownProtocols
+	4,  // 10: xray.app.proxyman.ReceiverConfig.sniffing_settings:type_name -> xray.app.proxyman.SniffingConfig
+	17, // 11: xray.app.proxyman.InboundHandlerConfig.receiver_settings:type_name -> xray.common.serial.TypedMessage
+	17, // 12: xray.app.proxyman.InboundHandlerConfig.proxy_settings:type_name -> xray.common.serial.TypedMessage
+	15, // 13: xray.app.proxyman.SenderConfig.via:type_name -> xray.common.net.IPOrDomain
+	16, // 14: xray.app.proxyman.SenderConfig.stream_settings:type_name -> xray.transport.internet.StreamConfig
+	18, // 15: xray.app.proxyman.SenderConfig.proxy_settings:type_name -> xray.transport.internet.ProxyConfig
+	9,  // 16: xray.app.proxyman.SenderConfig.multiplex_settings:type_name -> xray.app.proxyman.MultiplexingConfig
+	17, // [17:17] is the sub-list for method output_type
+	17, // [17:17] is the sub-list for method input_type
+	17, // [17:17] is the sub-list for extension type_name
+	17, // [17:17] is the sub-list for extension extendee
+	0,  // [0:17] is the sub-list for field type_name
 }
 
 func init() { file_app_proxyman_config_proto_init() }

app/proxyman/config.proto

@@ -6,6 +6,8 @@ option go_package = "github.com/xtls/xray-core/app/proxyman";
 option java_package = "com.xray.app.proxyman";
 option java_multiple_files = true;
 
+import "common/matcher/domain/domain.proto";
+import "common/matcher/geoip/geoip.proto";
 import "common/net/address.proto";
 import "common/net/port.proto";
 import "transport/internet/config.proto";
@@ -54,9 +56,15 @@ 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;
+
+  repeated xray.common.matcher.domain.Domain domains_excluded = 3;
+  repeated xray.common.matcher.geoip.GeoIP ips_excluded = 5;
+  
+  // 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/errors.generated.go

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

app/proxyman/inbound/always.go

@@ -91,13 +91,20 @@ func NewAlwaysOnInboundHandler(ctx context.Context, tag string, receiverConfig *
 		if net.HasNetwork(nl, net.Network_UNIX) {
 			newError("creating unix domain socket worker on ", address).AtDebug().WriteToLog()
 
+			sc := receiverConfig.GetEffectiveSniffingSettings()
+			sm, err := proxyman.NewSniffingMatcher(sc)
+			if err != nil {
+				return nil, err
+			}
+
 			worker := &dsWorker{
 				address:         address,
 				proxy:           p,
 				stream:          mss,
 				tag:             tag,
 				dispatcher:      h.mux,
-				sniffingConfig:  receiverConfig.GetEffectiveSniffingSettings(),
+				sniffingConfig:  sc,
+				sniffingMatcher: sm,
 				uplinkCounter:   uplinkCounter,
 				downlinkCounter: downlinkCounter,
 				ctx:             ctx,
@@ -110,6 +117,12 @@ func NewAlwaysOnInboundHandler(ctx context.Context, tag string, receiverConfig *
 			if net.HasNetwork(nl, net.Network_TCP) {
 				newError("creating stream worker on ", address, ":", port).AtDebug().WriteToLog()
 
+				sc := receiverConfig.GetEffectiveSniffingSettings()
+				sm, err := proxyman.NewSniffingMatcher(sc)
+				if err != nil {
+					return nil, err
+				}
+
 				worker := &tcpWorker{
 					address:         address,
 					port:            net.Port(port),
@@ -118,7 +131,8 @@ func NewAlwaysOnInboundHandler(ctx context.Context, tag string, receiverConfig *
 					recvOrigDest:    receiverConfig.ReceiveOriginalDestination,
 					tag:             tag,
 					dispatcher:      h.mux,
-					sniffingConfig:  receiverConfig.GetEffectiveSniffingSettings(),
+					sniffingConfig:  sc,
+					sniffingMatcher: sm,
 					uplinkCounter:   uplinkCounter,
 					downlinkCounter: downlinkCounter,
 					ctx:             ctx,
@@ -133,6 +147,7 @@ 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

@@ -39,6 +39,7 @@ type tcpWorker struct {
 	tag             string
 	dispatcher      routing.Dispatcher
 	sniffingConfig  *proxyman.SniffingConfig
+	sniffingMatcher *proxyman.SniffingMatcher
 	uplinkCounter   stats.Counter
 	downlinkCounter stats.Counter
 
@@ -97,7 +98,9 @@ func (w *tcpWorker) callback(conn internet.Connection) {
 	if w.sniffingConfig != nil {
 		content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
 		content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
-		content.SniffingRequest.ExcludeForDomain = w.sniffingConfig.DomainsExcluded
+		content.SniffingRequest.ExcludedDomainMatcher = w.sniffingMatcher.ExDomain
+		content.SniffingRequest.ExcludedIPMatcher = w.sniffingMatcher.ExIP
+		content.SniffingRequest.MetadataOnly = w.sniffingConfig.MetadataOnly
 	}
 	ctx = session.ContextWithContent(ctx, content)
 
@@ -235,6 +238,7 @@ type udpWorker struct {
 	tag             string
 	stream          *internet.MemoryStreamConfig
 	dispatcher      routing.Dispatcher
+	sniffingConfig  *proxyman.SniffingConfig
 	uplinkCounter   stats.Counter
 	downlinkCounter stats.Counter
 
@@ -297,7 +301,7 @@ 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 +315,13 @@ 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))
 			}
@@ -419,6 +430,7 @@ type dsWorker struct {
 	tag             string
 	dispatcher      routing.Dispatcher
 	sniffingConfig  *proxyman.SniffingConfig
+	sniffingMatcher *proxyman.SniffingMatcher
 	uplinkCounter   stats.Counter
 	downlinkCounter stats.Counter
 
@@ -450,7 +462,9 @@ func (w *dsWorker) callback(conn internet.Connection) {
 	if w.sniffingConfig != nil {
 		content.SniffingRequest.Enabled = w.sniffingConfig.Enabled
 		content.SniffingRequest.OverrideDestinationForProtocol = w.sniffingConfig.DestinationOverride
-		content.SniffingRequest.ExcludeForDomain = w.sniffingConfig.DomainsExcluded
+		content.SniffingRequest.ExcludedDomainMatcher = w.sniffingMatcher.ExDomain
+		content.SniffingRequest.ExcludedIPMatcher = w.sniffingMatcher.ExIP
+		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/command/command_test.go

@@ -12,6 +12,8 @@ import (
 	. "github.com/xtls/xray-core/app/router/command"
 	"github.com/xtls/xray-core/app/stats"
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/matcher/domain"
+	"github.com/xtls/xray-core/common/matcher/geoip"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/testing/mocks"
@@ -231,11 +233,11 @@ func TestSerivceTestRoute(t *testing.T) {
 				TargetTag:      &router.RoutingRule_Tag{Tag: "out"},
 			},
 			{
-				Domain:    []*router.Domain{{Type: router.Domain_Domain, Value: "com"}},
+				Domain:    []*domain.Domain{{Type: domain.MatchingType_Subdomain, Value: "com"}},
 				TargetTag: &router.RoutingRule_Tag{Tag: "out"},
 			},
 			{
-				SourceGeoip: []*router.GeoIP{{CountryCode: "private", Cidr: []*router.CIDR{{Ip: []byte{127, 0, 0, 0}, Prefix: 8}}}},
+				SourceGeoip: []*geoip.GeoIP{{CountryCode: "private", Cidr: []*geoip.CIDR{{Ip: []byte{127, 0, 0, 0}, Prefix: 8}}}},
 				TargetTag:   &router.RoutingRule_Tag{Tag: "out"},
 			},
 			{

app/router/command/config.go

@@ -28,6 +28,12 @@ func (c routingContext) GetTargetPort() net.Port {
 	return net.Port(c.RoutingContext.GetTargetPort())
 }
 
+// GetSkipDNSResolve is a mock implementation here to match the interface,
+// SkipDNSResolve is set from dns module, no use if coming from a protobuf object?
+func (c routingContext) GetSkipDNSResolve() bool {
+	return false
+}
+
 // AsRoutingContext converts a protobuf RoutingContext into an implementation of routing.Context.
 func AsRoutingContext(r *RoutingContext) routing.Context {
 	return routingContext{r}

app/router/condition.go

@@ -7,7 +7,6 @@ import (
 	"go.starlark.net/syntax"
 
 	"github.com/xtls/xray-core/common/net"
-	"github.com/xtls/xray-core/common/strmatcher"
 	"github.com/xtls/xray-core/features/routing"
 )
 
@@ -41,100 +40,6 @@ func (v *ConditionChan) Len() int {
 	return len(*v)
 }
 
-var matcherTypeMap = map[Domain_Type]strmatcher.Type{
-	Domain_Plain:  strmatcher.Substr,
-	Domain_Regex:  strmatcher.Regex,
-	Domain_Domain: strmatcher.Domain,
-	Domain_Full:   strmatcher.Full,
-}
-
-func domainToMatcher(domain *Domain) (strmatcher.Matcher, error) {
-	matcherType, f := matcherTypeMap[domain.Type]
-	if !f {
-		return nil, newError("unsupported domain type", domain.Type)
-	}
-
-	matcher, err := matcherType.New(domain.Value)
-	if err != nil {
-		return nil, newError("failed to create domain matcher").Base(err)
-	}
-
-	return matcher, nil
-}
-
-type DomainMatcher struct {
-	matchers strmatcher.IndexMatcher
-}
-
-func NewDomainMatcher(domains []*Domain) (*DomainMatcher, error) {
-	g := new(strmatcher.MatcherGroup)
-	for _, d := range domains {
-		m, err := domainToMatcher(d)
-		if err != nil {
-			return nil, err
-		}
-		g.Add(m)
-	}
-
-	return &DomainMatcher{
-		matchers: g,
-	}, nil
-}
-
-func (m *DomainMatcher) ApplyDomain(domain string) bool {
-	return len(m.matchers.Match(domain)) > 0
-}
-
-// Apply implements Condition.
-func (m *DomainMatcher) Apply(ctx routing.Context) bool {
-	domain := ctx.GetTargetDomain()
-	if len(domain) == 0 {
-		return false
-	}
-	return m.ApplyDomain(strings.ToLower(domain))
-}
-
-type MultiGeoIPMatcher struct {
-	matchers []*GeoIPMatcher
-	onSource bool
-}
-
-func NewMultiGeoIPMatcher(geoips []*GeoIP, onSource bool) (*MultiGeoIPMatcher, error) {
-	var matchers []*GeoIPMatcher
-	for _, geoip := range geoips {
-		matcher, err := globalGeoIPContainer.Add(geoip)
-		if err != nil {
-			return nil, err
-		}
-		matchers = append(matchers, matcher)
-	}
-
-	matcher := &MultiGeoIPMatcher{
-		matchers: matchers,
-		onSource: onSource,
-	}
-
-	return matcher, nil
-}
-
-// Apply implements Condition.
-func (m *MultiGeoIPMatcher) Apply(ctx routing.Context) bool {
-	var ips []net.IP
-	if m.onSource {
-		ips = ctx.GetSourceIPs()
-	} else {
-		ips = ctx.GetTargetIPs()
-	}
-	for _, ip := range ips {
-		for _, matcher := range m.matchers {
-			if matcher.Match(ip) {
-				return true
-			}
-		}
-	}
-	return false
-}
-
 type PortMatcher struct {
 	port     net.MemoryPortList
 	onSource bool

app/router/condition_test.go

@@ -11,6 +11,9 @@ import (
 	. "github.com/xtls/xray-core/app/router"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/matcher/domain"
+	"github.com/xtls/xray-core/common/matcher/geoip"
+	"github.com/xtls/xray-core/common/matcher/geosite"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/platform"
 	"github.com/xtls/xray-core/common/platform/filesystem"
@@ -26,10 +29,10 @@ 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")))
 	}
 }
 
@@ -61,18 +64,18 @@ func TestRoutingRule(t *testing.T) {
 	}{
 		{
 			rule: &RoutingRule{
-				Domain: []*Domain{
+				Domain: []*domain.Domain{
 					{
 						Value: "example.com",
-						Type:  Domain_Plain,
+						Type:  domain.MatchingType_Keyword,
 					},
 					{
 						Value: "google.com",
-						Type:  Domain_Domain,
+						Type:  domain.MatchingType_Subdomain,
 					},
 					{
 						Value: "^facebook\\.com$",
-						Type:  Domain_Regex,
+						Type:  domain.MatchingType_Regex,
 					},
 				},
 			},
@@ -109,7 +112,7 @@ func TestRoutingRule(t *testing.T) {
 		},
 		{
 			rule: &RoutingRule{
-				Cidr: []*CIDR{
+				Cidr: []*geoip.CIDR{
 					{
 						Ip:     []byte{8, 8, 8, 8},
 						Prefix: 32,
@@ -145,9 +148,9 @@ func TestRoutingRule(t *testing.T) {
 		},
 		{
 			rule: &RoutingRule{
-				Geoip: []*GeoIP{
+				Geoip: []*geoip.GeoIP{
 					{
-						Cidr: []*CIDR{
+						Cidr: []*geoip.CIDR{
 							{
 								Ip:     []byte{8, 8, 8, 8},
 								Prefix: 32,
@@ -185,7 +188,7 @@ func TestRoutingRule(t *testing.T) {
 		},
 		{
 			rule: &RoutingRule{
-				SourceCidr: []*CIDR{
+				SourceCidr: []*geoip.CIDR{
 					{
 						Ip:     []byte{192, 168, 0, 0},
 						Prefix: 16,
@@ -333,19 +336,19 @@ func TestRoutingRule(t *testing.T) {
 	}
 }
 
-func loadGeoSite(country string) ([]*Domain, error) {
+func loadGeoSite(country string) ([]*domain.Domain, error) {
 	geositeBytes, err := filesystem.ReadAsset("geosite.dat")
 	if err != nil {
 		return nil, err
 	}
-	var geositeList GeoSiteList
+	var geositeList geosite.GeoSiteList
 	if err := proto.Unmarshal(geositeBytes, &geositeList); err != nil {
 		return nil, err
 	}
 
 	for _, site := range geositeList.Entry {
 		if site.CountryCode == country {
-			return site.Domain, nil
+			return geosite.ToDomains(site.Domain), nil
 		}
 	}
 
@@ -356,7 +359,10 @@ func TestChinaSites(t *testing.T) {
 	domains, err := loadGeoSite("CN")
 	common.Must(err)
 
-	matcher, err := NewDomainMatcher(domains)
+	matcher, err := domain.NewDomainMatcher(domains)
+	common.Must(err)
+
+	acMatcher, err := domain.NewMphMatcherGroup(domains)
 	common.Must(err)
 
 	type TestCase struct {
@@ -387,20 +393,126 @@ func TestChinaSites(t *testing.T) {
 	}
 
 	for _, testCase := range testCases {
-		r := matcher.ApplyDomain(testCase.Domain)
-		if r != testCase.Output {
-			t.Error("expected output ", testCase.Output, " for domain ", testCase.Domain, " but got ", r)
+		r1 := matcher.ApplyDomain(testCase.Domain)
+		r2 := acMatcher.ApplyDomain(testCase.Domain)
+		if r1 != testCase.Output {
+			t.Error("DomainMatcher expected output ", testCase.Output, " for domain ", testCase.Domain, " but got ", r1)
+		} else if r2 != testCase.Output {
+			t.Error("ACDomainMatcher expected output ", testCase.Output, " for domain ", testCase.Domain, " but got ", r2)
 		}
 	}
 }
 
+func BenchmarkMphDomainMatcher(b *testing.B) {
+	domains, err := loadGeoSite("CN")
+	common.Must(err)
+
+	matcher, err := domain.NewMphMatcherGroup(domains)
+	common.Must(err)
+
+	type TestCase struct {
+		Domain string
+		Output bool
+	}
+	testCases := []TestCase{
+		{
+			Domain: "163.com",
+			Output: true,
+		},
+		{
+			Domain: "163.com",
+			Output: true,
+		},
+		{
+			Domain: "164.com",
+			Output: false,
+		},
+		{
+			Domain: "164.com",
+			Output: false,
+		},
+	}
+
+	for i := 0; i < 1024; i++ {
+		testCases = append(testCases, TestCase{Domain: strconv.Itoa(i) + ".not-exists.com", Output: false})
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		for _, testCase := range testCases {
+			_ = matcher.ApplyDomain(testCase.Domain)
+		}
+	}
+}
+
+func BenchmarkDomainMatcher(b *testing.B) {
+	domains, err := loadGeoSite("CN")
+	common.Must(err)
+
+	matcher, err := domain.NewDomainMatcher(domains)
+	common.Must(err)
+
+	type TestCase struct {
+		Domain string
+		Output bool
+	}
+	testCases := []TestCase{
+		{
+			Domain: "163.com",
+			Output: true,
+		},
+		{
+			Domain: "163.com",
+			Output: true,
+		},
+		{
+			Domain: "164.com",
+			Output: false,
+		},
+		{
+			Domain: "164.com",
+			Output: false,
+		},
+	}
+
+	for i := 0; i < 1024; i++ {
+		testCases = append(testCases, TestCase{Domain: strconv.Itoa(i) + ".not-exists.com", Output: false})
+	}
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		for _, testCase := range testCases {
+			_ = matcher.ApplyDomain(testCase.Domain)
+		}
+	}
+}
+
+func loadGeoIP(country string) ([]*geoip.CIDR, error) {
+	geoipBytes, err := filesystem.ReadAsset("dat")
+	if err != nil {
+		return nil, err
+	}
+	var geoipList geoip.GeoIPList
+	if err := proto.Unmarshal(geoipBytes, &geoipList); err != nil {
+		return nil, err
+	}
+
+	for _, geoip := range geoipList.Entry {
+		if geoip.CountryCode == country {
+			return geoip.Cidr, nil
+		}
+	}
+
+	panic("country not found: " + country)
+}
+
 func BenchmarkMultiGeoIPMatcher(b *testing.B) {
-	var geoips []*GeoIP
+	var geoips []*geoip.GeoIP
 
 	{
 		ips, err := loadGeoIP("CN")
 		common.Must(err)
-		geoips = append(geoips, &GeoIP{
+		geoips = append(geoips, &geoip.GeoIP{
 			CountryCode: "CN",
 			Cidr:        ips,
 		})
@@ -409,7 +521,7 @@ func BenchmarkMultiGeoIPMatcher(b *testing.B) {
 	{
 		ips, err := loadGeoIP("JP")
 		common.Must(err)
-		geoips = append(geoips, &GeoIP{
+		geoips = append(geoips, &geoip.GeoIP{
 			CountryCode: "JP",
 			Cidr:        ips,
 		})
@@ -418,7 +530,7 @@ func BenchmarkMultiGeoIPMatcher(b *testing.B) {
 	{
 		ips, err := loadGeoIP("CA")
 		common.Must(err)
-		geoips = append(geoips, &GeoIP{
+		geoips = append(geoips, &geoip.GeoIP{
 			CountryCode: "CA",
 			Cidr:        ips,
 		})
@@ -427,13 +539,13 @@ func BenchmarkMultiGeoIPMatcher(b *testing.B) {
 	{
 		ips, err := loadGeoIP("US")
 		common.Must(err)
-		geoips = append(geoips, &GeoIP{
+		geoips = append(geoips, &geoip.GeoIP{
 			CountryCode: "US",
 			Cidr:        ips,
 		})
 	}
 
-	matcher, err := NewMultiGeoIPMatcher(geoips, false)
+	matcher, err := geoip.NewMultiGeoIPMatcher(geoips, false)
 	common.Must(err)
 
 	ctx := withOutbound(&session.Outbound{Target: net.TCPDestination(net.ParseAddress("8.8.8.8"), 80)})

app/router/config.go

@@ -1,50 +1,13 @@
 package router
 
 import (
+	dm "github.com/xtls/xray-core/common/matcher/domain"
+	"github.com/xtls/xray-core/common/matcher/geoip"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/features/outbound"
 	"github.com/xtls/xray-core/features/routing"
 )
 
-// CIDRList is an alias of []*CIDR to provide sort.Interface.
-type CIDRList []*CIDR
-
-// Len implements sort.Interface.
-func (l *CIDRList) Len() int {
-	return len(*l)
-}
-
-// Less implements sort.Interface.
-func (l *CIDRList) Less(i int, j int) bool {
-	ci := (*l)[i]
-	cj := (*l)[j]
-
-	if len(ci.Ip) < len(cj.Ip) {
-		return true
-	}
-
-	if len(ci.Ip) > len(cj.Ip) {
-		return false
-	}
-
-	for k := 0; k < len(ci.Ip); k++ {
-		if ci.Ip[k] < cj.Ip[k] {
-			return true
-		}
-
-		if ci.Ip[k] > cj.Ip[k] {
-			return false
-		}
-	}
-
-	return ci.Prefix < cj.Prefix
-}
-
-// Swap implements sort.Interface.
-func (l *CIDRList) Swap(i int, j int) {
-	(*l)[i], (*l)[j] = (*l)[j], (*l)[i]
-}
-
 type Rule struct {
 	Tag       string
 	Balancer  *Balancer
@@ -67,11 +30,24 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 	conds := NewConditionChan()
 
 	if len(rr.Domain) > 0 {
-		matcher, err := NewDomainMatcher(rr.Domain)
-		if err != nil {
-			return nil, newError("failed to build domain condition").Base(err)
+		switch rr.DomainMatcher {
+		case "linear":
+			matcher, err := dm.NewDomainMatcher(rr.Domain)
+			if err != nil {
+				return nil, newError("failed to build domain condition").Base(err)
+			}
+			conds.Add(matcher)
+		case "mph", "hybrid":
+			fallthrough
+		default:
+			matcher, err := dm.NewMphMatcherGroup(rr.Domain)
+			if err != nil {
+				return nil, newError("failed to build domain condition with MphDomainMatcher").Base(err)
+			}
+			newError("MphDomainMatcher is enabled for ", len(rr.Domain), " domain rule(s)").AtDebug().WriteToLog()
+			conds.Add(matcher)
 		}
-		conds.Add(matcher)
+
 	}
 
 	if len(rr.UserEmail) > 0 {
@@ -99,13 +75,13 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 	}
 
 	if len(rr.Geoip) > 0 {
-		cond, err := NewMultiGeoIPMatcher(rr.Geoip, false)
+		cond, err := geoip.NewMultiGeoIPMatcher(rr.Geoip, false)
 		if err != nil {
 			return nil, err
 		}
 		conds.Add(cond)
 	} else if len(rr.Cidr) > 0 {
-		cond, err := NewMultiGeoIPMatcher([]*GeoIP{{Cidr: rr.Cidr}}, false)
+		cond, err := geoip.NewMultiGeoIPMatcher([]*geoip.GeoIP{{Cidr: rr.Cidr}}, false)
 		if err != nil {
 			return nil, err
 		}
@@ -113,13 +89,13 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 	}
 
 	if len(rr.SourceGeoip) > 0 {
-		cond, err := NewMultiGeoIPMatcher(rr.SourceGeoip, true)
+		cond, err := geoip.NewMultiGeoIPMatcher(rr.SourceGeoip, true)
 		if err != nil {
 			return nil, err
 		}
 		conds.Add(cond)
 	} else if len(rr.SourceCidr) > 0 {
-		cond, err := NewMultiGeoIPMatcher([]*GeoIP{{Cidr: rr.SourceCidr}}, true)
+		cond, err := geoip.NewMultiGeoIPMatcher([]*geoip.GeoIP{{Cidr: rr.SourceCidr}}, true)
 		if err != nil {
 			return nil, err
 		}

app/router/config.proto

@@ -8,66 +8,8 @@ option java_multiple_files = true;
 
 import "common/net/port.proto";
 import "common/net/network.proto";
-
-// Domain for routing decision.
-message Domain {
-  // Type of domain value.
-  enum Type {
-    // The value is used as is.
-    Plain = 0;
-    // The value is used as a regular expression.
-    Regex = 1;
-    // The value is a root domain.
-    Domain = 2;
-    // The value is a domain.
-    Full = 3;
-  }
-
-  // Domain matching type.
-  Type type = 1;
-
-  // Domain value.
-  string value = 2;
-
-  message Attribute {
-    string key = 1;
-
-    oneof typed_value {
-      bool bool_value = 2;
-      int64 int_value = 3;
-    }
-  }
-
-  // Attributes of this domain. May be used for filtering.
-  repeated Attribute attribute = 3;
-}
-
-// IP for routing decision, in CIDR form.
-message CIDR {
-  // IP address, should be either 4 or 16 bytes.
-  bytes ip = 1;
-
-  // Number of leading ones in the network mask.
-  uint32 prefix = 2;
-}
-
-message GeoIP {
-  string country_code = 1;
-  repeated CIDR cidr = 2;
-}
-
-message GeoIPList {
-  repeated GeoIP entry = 1;
-}
-
-message GeoSite {
-  string country_code = 1;
-  repeated Domain domain = 2;
-}
-
-message GeoSiteList {
-  repeated GeoSite entry = 1;
-}
+import "common/matcher/domain/domain.proto";
+import "common/matcher/geoip/geoip.proto";
 
 message RoutingRule {
   oneof target_tag {
@@ -79,17 +21,17 @@ message RoutingRule {
   }
 
   // List of domains for target domain matching.
-  repeated Domain domain = 2;
+  repeated xray.common.matcher.domain.Domain domain = 2;
 
   // List of CIDRs for target IP address matching.
   // Deprecated. Use geoip below.
-  repeated CIDR cidr = 3 [deprecated = true];
+  repeated xray.common.matcher.geoip.CIDR cidr = 3 [deprecated = true];
 
   // List of GeoIPs for target IP address matching. If this entry exists, the
   // cidr above will have no effect. GeoIP fields with the same country code are
   // supposed to contain exactly same content. They will be merged during
   // runtime. For customized GeoIPs, please leave country code empty.
-  repeated GeoIP geoip = 10;
+  repeated xray.common.matcher.geoip.GeoIP geoip = 10;
 
   // A range of port [from, to]. If the destination port is in this range, this
   // rule takes effect. Deprecated. Use port_list.
@@ -105,11 +47,11 @@ message RoutingRule {
   repeated xray.common.net.Network networks = 13;
 
   // List of CIDRs for source IP address matching.
-  repeated CIDR source_cidr = 6 [deprecated = true];
+  repeated xray.common.matcher.geoip.CIDR source_cidr = 6 [deprecated = true];
 
   // List of GeoIPs for source IP address matching. If this entry exists, the
   // source_cidr above will have no effect.
-  repeated GeoIP source_geoip = 11;
+  repeated xray.common.matcher.geoip.GeoIP source_geoip = 11;
 
   // List of ports for source port matching.
   xray.common.net.PortList source_port_list = 16;
@@ -119,6 +61,8 @@ message RoutingRule {
   repeated string protocol = 9;
 
   string attributes = 15;
+
+  string domain_matcher = 17;
 }
 
 message BalancingRule {

app/router/router.go

@@ -80,7 +80,13 @@ func (r *Router) PickRoute(ctx routing.Context) (routing.Route, error) {
 }
 
 func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context, error) {
-	if r.domainStrategy == Config_IpOnDemand {
+
+	// SkipDNSResolve is set from DNS module.
+	// the DOH remote server maybe a domain name,
+	// this prevents cycle resolving dead loop
+	skipDNSResolve := ctx.GetSkipDNSResolve()
+
+	if r.domainStrategy == Config_IpOnDemand && !skipDNSResolve {
 		ctx = routing_dns.ContextWithDNSClient(ctx, r.dns)
 	}
 
@@ -90,7 +96,7 @@ func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context,
 		}
 	}
 
-	if r.domainStrategy != Config_IpIfNonMatch || len(ctx.GetTargetDomain()) == 0 {
+	if r.domainStrategy != Config_IpIfNonMatch || len(ctx.GetTargetDomain()) == 0 || skipDNSResolve {
 		return nil, ctx, common.ErrNoClue
 	}
 

app/router/router_test.go

@@ -7,6 +7,7 @@ import (
 	"github.com/golang/mock/gomock"
 	. "github.com/xtls/xray-core/app/router"
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/matcher/geoip"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/features/outbound"
@@ -101,7 +102,7 @@ func TestIPOnDemand(t *testing.T) {
 				TargetTag: &RoutingRule_Tag{
 					Tag: "test",
 				},
-				Cidr: []*CIDR{
+				Cidr: []*geoip.CIDR{
 					{
 						Ip:     []byte{192, 168, 0, 0},
 						Prefix: 16,
@@ -136,7 +137,7 @@ func TestIPIfNonMatchDomain(t *testing.T) {
 				TargetTag: &RoutingRule_Tag{
 					Tag: "test",
 				},
-				Cidr: []*CIDR{
+				Cidr: []*geoip.CIDR{
 					{
 						Ip:     []byte{192, 168, 0, 0},
 						Prefix: 16,
@@ -171,7 +172,7 @@ func TestIPIfNonMatchIP(t *testing.T) {
 				TargetTag: &RoutingRule_Tag{
 					Tag: "test",
 				},
-				Cidr: []*CIDR{
+				Cidr: []*geoip.CIDR{
 					{
 						Ip:     []byte{127, 0, 0, 0},
 						Prefix: 8,

app/stats/command/command.go

@@ -11,7 +11,7 @@ import (
 
 	"github.com/xtls/xray-core/app/stats"
 	"github.com/xtls/xray-core/common"
-	"github.com/xtls/xray-core/common/strmatcher"
+	"github.com/xtls/xray-core/common/matcher/str"
 	"github.com/xtls/xray-core/core"
 	feature_stats "github.com/xtls/xray-core/features/stats"
 )
@@ -49,7 +49,7 @@ func (s *statsServer) GetStats(ctx context.Context, request *GetStatsRequest) (*
 }
 
 func (s *statsServer) QueryStats(ctx context.Context, request *QueryStatsRequest) (*QueryStatsResponse, error) {
-	matcher, err := strmatcher.Substr.New(request.Pattern)
+	matcher, err := str.Substr.New(request.Pattern)
 	if err != nil {
 		return nil, err
 	}

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 = b[:Size]
+	}
+
+	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 {

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/matcher/domain/conf/conf.go

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

common/matcher/domain/conf/domain.go

@@ -0,0 +1,94 @@
+package conf
+
+import (
+	"strings"
+
+	dm "github.com/xtls/xray-core/common/matcher/domain"
+	"github.com/xtls/xray-core/common/matcher/geosite"
+)
+
+func ParseDomainRule(domain string) ([]*dm.Domain, error) {
+	if strings.HasPrefix(domain, "geosite:") {
+		country := strings.ToUpper(domain[8:])
+		domains, err := geosite.LoadGeositeWithAttr("geosite.dat", country)
+		if err != nil {
+			return nil, newError("failed to load geosite: ", country).Base(err)
+		}
+		return domains, nil
+	}
+	var isExtDatFile = 0
+	{
+		const prefix = "ext:"
+		if strings.HasPrefix(domain, prefix) {
+			isExtDatFile = len(prefix)
+		}
+		const prefixQualified = "ext-domain:"
+		if strings.HasPrefix(domain, prefixQualified) {
+			isExtDatFile = len(prefixQualified)
+		}
+	}
+	if isExtDatFile != 0 {
+		kv := strings.Split(domain[isExtDatFile:], ":")
+		if len(kv) != 2 {
+			return nil, newError("invalid external resource: ", domain)
+		}
+		filename := kv[0]
+		country := kv[1]
+		domains, err := geosite.LoadGeositeWithAttr(filename, country)
+		if err != nil {
+			return nil, newError("failed to load external sites: ", country, " from ", filename).Base(err)
+		}
+		return domains, nil
+	}
+
+	domainRule := new(dm.Domain)
+	switch {
+	case strings.HasPrefix(domain, "regexp:"):
+		regexpVal := domain[7:]
+		if len(regexpVal) == 0 {
+			return nil, newError("empty regexp type of rule: ", domain)
+		}
+		domainRule.Type = dm.MatchingType_Regex
+		domainRule.Value = regexpVal
+
+	case strings.HasPrefix(domain, "domain:"):
+		domainName := domain[7:]
+		if len(domainName) == 0 {
+			return nil, newError("empty domain type of rule: ", domain)
+		}
+		domainRule.Type = dm.MatchingType_Subdomain
+		domainRule.Value = domainName
+
+	case strings.HasPrefix(domain, "full:"):
+		fullVal := domain[5:]
+		if len(fullVal) == 0 {
+			return nil, newError("empty full domain type of rule: ", domain)
+		}
+		domainRule.Type = dm.MatchingType_Full
+		domainRule.Value = fullVal
+
+	case strings.HasPrefix(domain, "keyword:"):
+		keywordVal := domain[8:]
+		if len(keywordVal) == 0 {
+			return nil, newError("empty keyword type of rule: ", domain)
+		}
+		domainRule.Type = dm.MatchingType_Keyword
+		domainRule.Value = keywordVal
+
+	case strings.HasPrefix(domain, "dotless:"):
+		domainRule.Type = dm.MatchingType_Regex
+		switch substr := domain[8:]; {
+		case substr == "":
+			domainRule.Value = "^[^.]*$"
+		case !strings.Contains(substr, "."):
+			domainRule.Value = "^[^.]*" + substr + "[^.]*$"
+		default:
+			return nil, newError("substr in dotless rule should not contain a dot: ", substr)
+		}
+
+	default:
+		domainRule.Type = dm.MatchingType_Keyword
+		domainRule.Value = domain
+	}
+	return []*dm.Domain{domainRule}, nil
+}

common/matcher/domain/conf/errors.generated.go

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

common/matcher/domain/domain.go

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

common/matcher/domain/domain.pb.go

@@ -0,0 +1,229 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.25.0
+// 	protoc        v3.15.6
+// source: common/matcher/domain/domain.proto
+
+package domain
+
+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 MatchingType int32
+
+const (
+	MatchingType_Full      MatchingType = 0
+	MatchingType_Subdomain MatchingType = 1
+	MatchingType_Keyword   MatchingType = 2
+	MatchingType_Regex     MatchingType = 3
+)
+
+// Enum value maps for MatchingType.
+var (
+	MatchingType_name = map[int32]string{
+		0: "Full",
+		1: "Subdomain",
+		2: "Keyword",
+		3: "Regex",
+	}
+	MatchingType_value = map[string]int32{
+		"Full":      0,
+		"Subdomain": 1,
+		"Keyword":   2,
+		"Regex":     3,
+	}
+)
+
+func (x MatchingType) Enum() *MatchingType {
+	p := new(MatchingType)
+	*p = x
+	return p
+}
+
+func (x MatchingType) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (MatchingType) Descriptor() protoreflect.EnumDescriptor {
+	return file_common_matcher_domain_domain_proto_enumTypes[0].Descriptor()
+}
+
+func (MatchingType) Type() protoreflect.EnumType {
+	return &file_common_matcher_domain_domain_proto_enumTypes[0]
+}
+
+func (x MatchingType) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use MatchingType.Descriptor instead.
+func (MatchingType) EnumDescriptor() ([]byte, []int) {
+	return file_common_matcher_domain_domain_proto_rawDescGZIP(), []int{0}
+}
+
+type Domain struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Domain matching type.
+	Type MatchingType `protobuf:"varint,1,opt,name=type,proto3,enum=xray.common.matcher.domain.MatchingType" json:"type,omitempty"`
+	// Domain value.
+	Value string `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
+}
+
+func (x *Domain) Reset() {
+	*x = Domain{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_common_matcher_domain_domain_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Domain) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Domain) ProtoMessage() {}
+
+func (x *Domain) ProtoReflect() protoreflect.Message {
+	mi := &file_common_matcher_domain_domain_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 Domain.ProtoReflect.Descriptor instead.
+func (*Domain) Descriptor() ([]byte, []int) {
+	return file_common_matcher_domain_domain_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Domain) GetType() MatchingType {
+	if x != nil {
+		return x.Type
+	}
+	return MatchingType_Full
+}
+
+func (x *Domain) GetValue() string {
+	if x != nil {
+		return x.Value
+	}
+	return ""
+}
+
+var File_common_matcher_domain_domain_proto protoreflect.FileDescriptor
+
+var file_common_matcher_domain_domain_proto_rawDesc = []byte{
+	0x0a, 0x22, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2f, 0x6d, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72,
+	0x2f, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x2f, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x2e, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x12, 0x1a, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f,
+	0x6e, 0x2e, 0x6d, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x2e, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e,
+	0x22, 0x5c, 0x0a, 0x06, 0x44, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x12, 0x3c, 0x0a, 0x04, 0x74, 0x79,
+	0x70, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0e, 0x32, 0x28, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e,
+	0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x6d, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x2e, 0x64,
+	0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x2e, 0x4d, 0x61, 0x74, 0x63, 0x68, 0x69, 0x6e, 0x67, 0x54, 0x79,
+	0x70, 0x65, 0x52, 0x04, 0x74, 0x79, 0x70, 0x65, 0x12, 0x14, 0x0a, 0x05, 0x76, 0x61, 0x6c, 0x75,
+	0x65, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x2a, 0x3f,
+	0x0a, 0x0c, 0x4d, 0x61, 0x74, 0x63, 0x68, 0x69, 0x6e, 0x67, 0x54, 0x79, 0x70, 0x65, 0x12, 0x08,
+	0x0a, 0x04, 0x46, 0x75, 0x6c, 0x6c, 0x10, 0x00, 0x12, 0x0d, 0x0a, 0x09, 0x53, 0x75, 0x62, 0x64,
+	0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x10, 0x01, 0x12, 0x0b, 0x0a, 0x07, 0x4b, 0x65, 0x79, 0x77, 0x6f,
+	0x72, 0x64, 0x10, 0x02, 0x12, 0x09, 0x0a, 0x05, 0x52, 0x65, 0x67, 0x65, 0x78, 0x10, 0x03, 0x42,
+	0x70, 0x0a, 0x1e, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d,
+	0x6f, 0x6e, 0x2e, 0x6d, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x2e, 0x64, 0x6f, 0x6d, 0x61, 0x69,
+	0x6e, 0x50, 0x01, 0x5a, 0x2f, 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, 0x6d, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x2f, 0x64, 0x6f,
+	0x6d, 0x61, 0x69, 0x6e, 0xaa, 0x02, 0x1a, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x43, 0x6f, 0x6d, 0x6d,
+	0x6f, 0x6e, 0x2e, 0x4d, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x2e, 0x44, 0x6f, 0x6d, 0x61, 0x69,
+	0x6e, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_common_matcher_domain_domain_proto_rawDescOnce sync.Once
+	file_common_matcher_domain_domain_proto_rawDescData = file_common_matcher_domain_domain_proto_rawDesc
+)
+
+func file_common_matcher_domain_domain_proto_rawDescGZIP() []byte {
+	file_common_matcher_domain_domain_proto_rawDescOnce.Do(func() {
+		file_common_matcher_domain_domain_proto_rawDescData = protoimpl.X.CompressGZIP(file_common_matcher_domain_domain_proto_rawDescData)
+	})
+	return file_common_matcher_domain_domain_proto_rawDescData
+}
+
+var file_common_matcher_domain_domain_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_common_matcher_domain_domain_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_common_matcher_domain_domain_proto_goTypes = []interface{}{
+	(MatchingType)(0), // 0: xray.common.matcher.domain.MatchingType
+	(*Domain)(nil),    // 1: xray.common.matcher.domain.Domain
+}
+var file_common_matcher_domain_domain_proto_depIdxs = []int32{
+	0, // 0: xray.common.matcher.domain.Domain.type:type_name -> xray.common.matcher.domain.MatchingType
+	1, // [1:1] is the sub-list for method output_type
+	1, // [1:1] is the sub-list for method input_type
+	1, // [1:1] is the sub-list for extension type_name
+	1, // [1:1] is the sub-list for extension extendee
+	0, // [0:1] is the sub-list for field type_name
+}
+
+func init() { file_common_matcher_domain_domain_proto_init() }
+func file_common_matcher_domain_domain_proto_init() {
+	if File_common_matcher_domain_domain_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_common_matcher_domain_domain_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Domain); 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_common_matcher_domain_domain_proto_rawDesc,
+			NumEnums:      1,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_common_matcher_domain_domain_proto_goTypes,
+		DependencyIndexes: file_common_matcher_domain_domain_proto_depIdxs,
+		EnumInfos:         file_common_matcher_domain_domain_proto_enumTypes,
+		MessageInfos:      file_common_matcher_domain_domain_proto_msgTypes,
+	}.Build()
+	File_common_matcher_domain_domain_proto = out.File
+	file_common_matcher_domain_domain_proto_rawDesc = nil
+	file_common_matcher_domain_domain_proto_goTypes = nil
+	file_common_matcher_domain_domain_proto_depIdxs = nil
+}

common/matcher/domain/domain.proto

@@ -0,0 +1,39 @@
+syntax = "proto3";
+
+package xray.common.matcher.domain;
+option csharp_namespace = "Xray.Common.Matcher.Domain";
+option go_package = "github.com/xtls/xray-core/common/matcher/domain";
+option java_package = "com.xray.common.matcher.domain";
+option java_multiple_files = true;
+
+enum MatchingType {
+  Full = 0;
+  Subdomain = 1;
+  Keyword = 2;
+  Regex = 3;
+}
+
+message Domain {
+  // Domain matching type.
+  MatchingType type = 1;
+
+  // Domain value.
+  string value = 2;
+}
+
+/*
+func toDomainMatchingType(t router.Domain_Type) dns.DomainMatchingType {
+	switch t {
+	case router.Domain_Domain:
+		return dns.DomainMatchingType_Subdomain
+	case router.Domain_Full:
+		return dns.DomainMatchingType_Full
+	case router.Domain_Plain:
+		return dns.DomainMatchingType_Keyword
+	case router.Domain_Regex:
+		return dns.DomainMatchingType_Regex
+	default:
+		panic("unknown domain type")
+	}
+}
+ */

common/matcher/domain/errors.generated.go

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

common/matcher/domain/matcher.go

@@ -0,0 +1,79 @@
+package domain
+
+import (
+	"strings"
+
+	"github.com/xtls/xray-core/common/matcher/str"
+	"github.com/xtls/xray-core/features/routing"
+)
+
+var matcherTypeMap = map[MatchingType]str.Type{
+	MatchingType_Keyword:   str.Substr,
+	MatchingType_Regex:     str.Regex,
+	MatchingType_Subdomain: str.Domain,
+	MatchingType_Full:      str.Full,
+}
+
+func domainToMatcher(domain *Domain) (str.Matcher, error) {
+	matcherType, f := matcherTypeMap[domain.Type]
+	if !f {
+		return nil, newError("unsupported domain type", domain.Type)
+	}
+
+	matcher, err := matcherType.New(domain.Value)
+	if err != nil {
+		return nil, newError("failed to create domain matcher").Base(err)
+	}
+
+	return matcher, nil
+}
+
+type DomainMatcher struct {
+	matchers str.IndexMatcher
+}
+
+func NewMphMatcherGroup(domains []*Domain) (*DomainMatcher, error) {
+	g := str.NewMphMatcherGroup()
+	for _, d := range domains {
+		matcherType, f := matcherTypeMap[d.Type]
+		if !f {
+			return nil, newError("unsupported domain type", d.Type)
+		}
+		_, err := g.AddPattern(d.Value, matcherType)
+		if err != nil {
+			return nil, err
+		}
+	}
+	g.Build()
+	return &DomainMatcher{
+		matchers: g,
+	}, nil
+}
+
+func NewDomainMatcher(domains []*Domain) (*DomainMatcher, error) {
+	g := new(str.MatcherGroup)
+	for _, d := range domains {
+		m, err := domainToMatcher(d)
+		if err != nil {
+			return nil, err
+		}
+		g.Add(m)
+	}
+
+	return &DomainMatcher{
+		matchers: g,
+	}, nil
+}
+
+func (m *DomainMatcher) ApplyDomain(domain string) bool {
+	return len(m.matchers.Match(strings.ToLower(domain))) > 0
+}
+
+// Apply implements Condition.
+func (m *DomainMatcher) Apply(ctx routing.Context) bool {
+	domain := ctx.GetTargetDomain()
+	if len(domain) == 0 {
+		return false
+	}
+	return m.ApplyDomain(domain)
+}

common/matcher/geoip/conf.go

@@ -0,0 +1,224 @@
+package geoip
+
+import (
+	"runtime"
+	"strconv"
+	"strings"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/platform/filesystem"
+)
+
+var (
+	FileCache = make(map[string][]byte)
+	IPCache   = make(map[string]*GeoIP)
+)
+
+func LoadGeoIP(code string) ([]*CIDR, error) {
+	return LoadIPFile("geoip.dat", code)
+}
+
+func LoadIPFile(file, code string) ([]*CIDR, error) {
+	index := file + ":" + code
+	if IPCache[index] == nil {
+		bs, err := loadFile(file)
+		if err != nil {
+			return nil, newError("failed to load file: ", file).Base(err)
+		}
+		bs = find(bs, []byte(code))
+		if bs == nil {
+			return nil, newError("code not found in ", file, ": ", code)
+		}
+		var geoipdat GeoIP
+		if err := proto.Unmarshal(bs, &geoipdat); err != nil {
+			return nil, newError("error unmarshal IP in ", file, ": ", code).Base(err)
+		}
+		defer runtime.GC()        // or debug.FreeOSMemory()
+		return geoipdat.Cidr, nil // do not cache geoip
+		// IPCache[index] = &geoipdat
+	}
+	return IPCache[index].Cidr, nil
+}
+
+func loadFile(file string) ([]byte, error) {
+	if FileCache[file] == nil {
+		bs, err := filesystem.ReadAsset(file)
+		if err != nil {
+			return nil, newError("failed to open file: ", file).Base(err)
+		}
+		if len(bs) == 0 {
+			return nil, newError("empty file: ", file)
+		}
+		// Do not cache file, may save RAM when there
+		// are many files, but consume CPU each time.
+		return bs, nil
+		// FileCache[file] = bs
+	}
+	return FileCache[file], nil
+}
+
+func find(data, code []byte) []byte {
+	codeL := len(code)
+	if codeL == 0 {
+		return nil
+	}
+	for {
+		dataL := len(data)
+		if dataL < 2 {
+			return nil
+		}
+		x, y := proto.DecodeVarint(data[1:])
+		if x == 0 && y == 0 {
+			return nil
+		}
+		headL, bodyL := 1+y, int(x)
+		dataL -= headL
+		if dataL < bodyL {
+			return nil
+		}
+		data = data[headL:]
+		if int(data[1]) == codeL {
+			for i := 0; i < codeL && data[2+i] == code[i]; i++ {
+				if i+1 == codeL {
+					return data[:bodyL]
+				}
+			}
+		}
+		if dataL == bodyL {
+			return nil
+		}
+		data = data[bodyL:]
+	}
+}
+
+func ParseIPList(ips []string) ([]*GeoIP, error) {
+	var geoipList []*GeoIP
+	var customCidrs []*CIDR
+
+	for _, ip := range ips {
+		if strings.HasPrefix(ip, "geoip:") {
+			country := ip[6:]
+			isReverseMatch := false
+			if strings.HasPrefix(country, "!") {
+				country = country[1:]
+				isReverseMatch = true
+			}
+
+			geoipc, err := LoadGeoIP(strings.ToUpper(country))
+			if err != nil {
+				return nil, newError("failed to load GeoIP: ", country).Base(err)
+			}
+
+			geoipList = append(geoipList, &GeoIP{
+				CountryCode:  strings.ToUpper(country),
+				Cidr:         geoipc,
+				ReverseMatch: isReverseMatch,
+			})
+			continue
+		}
+		var isExtDatFile = 0
+		{
+			const prefix = "ext:"
+			if strings.HasPrefix(ip, prefix) {
+				isExtDatFile = len(prefix)
+			}
+			const prefixQualified = "ext-ip:"
+			if strings.HasPrefix(ip, prefixQualified) {
+				isExtDatFile = len(prefixQualified)
+			}
+		}
+		if isExtDatFile != 0 {
+			kv := strings.Split(ip[isExtDatFile:], ":")
+			if len(kv) != 2 {
+				return nil, newError("invalid external resource: ", ip)
+			}
+
+			filename := kv[0]
+			country := kv[1]
+			if len(filename) == 0 || len(country) == 0 {
+				return nil, newError("empty filename or empty country in rule")
+			}
+
+			isReverseMatch := false
+			if strings.HasPrefix(country, "!") {
+				country = country[1:]
+				isReverseMatch = true
+			}
+			geoipc, err := LoadIPFile(filename, strings.ToUpper(country))
+			if err != nil {
+				return nil, newError("failed to load IPs: ", country, " from ", filename).Base(err)
+			}
+
+			geoipList = append(geoipList, &GeoIP{
+				CountryCode:  strings.ToUpper(filename + "_" + country),
+				Cidr:         geoipc,
+				ReverseMatch: isReverseMatch,
+			})
+
+			continue
+		}
+
+		ipRule, err := ParseIP(ip)
+		if err != nil {
+			return nil, newError("invalid IP: ", ip).Base(err)
+		}
+		customCidrs = append(customCidrs, ipRule)
+	}
+
+	if len(customCidrs) > 0 {
+		geoipList = append(geoipList, &GeoIP{
+			Cidr: customCidrs,
+		})
+	}
+
+	return geoipList, nil
+}
+
+func ParseIP(s string) (*CIDR, error) {
+	var addr, mask string
+	i := strings.Index(s, "/")
+	if i < 0 {
+		addr = s
+	} else {
+		addr = s[:i]
+		mask = s[i+1:]
+	}
+	ip := net.ParseAddress(addr)
+	switch ip.Family() {
+	case net.AddressFamilyIPv4:
+		bits := uint32(32)
+		if len(mask) > 0 {
+			bits64, err := strconv.ParseUint(mask, 10, 32)
+			if err != nil {
+				return nil, newError("invalid network mask for router: ", mask).Base(err)
+			}
+			bits = uint32(bits64)
+		}
+		if bits > 32 {
+			return nil, newError("invalid network mask for router: ", bits)
+		}
+		return &CIDR{
+			Ip:     ip.IP(),
+			Prefix: bits,
+		}, nil
+	case net.AddressFamilyIPv6:
+		bits := uint32(128)
+		if len(mask) > 0 {
+			bits64, err := strconv.ParseUint(mask, 10, 32)
+			if err != nil {
+				return nil, newError("invalid network mask for router: ", mask).Base(err)
+			}
+			bits = uint32(bits64)
+		}
+		if bits > 128 {
+			return nil, newError("invalid network mask for router: ", bits)
+		}
+		return &CIDR{
+			Ip:     ip.IP(),
+			Prefix: bits,
+		}, nil
+	default:
+		return nil, newError("unsupported address for router: ", s)
+	}
+}

common/matcher/geoip/crid.go

@@ -0,0 +1,40 @@
+package geoip
+
+// CIDRList is an alias of []*CIDR to provide sort.Interface.
+type CIDRList []*CIDR
+
+// Len implements sort.Interface.
+func (l *CIDRList) Len() int {
+	return len(*l)
+}
+
+// Less implements sort.Interface.
+func (l *CIDRList) Less(i int, j int) bool {
+	ci := (*l)[i]
+	cj := (*l)[j]
+
+	if len(ci.Ip) < len(cj.Ip) {
+		return true
+	}
+
+	if len(ci.Ip) > len(cj.Ip) {
+		return false
+	}
+
+	for k := 0; k < len(ci.Ip); k++ {
+		if ci.Ip[k] < cj.Ip[k] {
+			return true
+		}
+
+		if ci.Ip[k] > cj.Ip[k] {
+			return false
+		}
+	}
+
+	return ci.Prefix < cj.Prefix
+}
+
+// Swap implements sort.Interface.
+func (l *CIDRList) Swap(i int, j int) {
+	(*l)[i], (*l)[j] = (*l)[j], (*l)[i]
+}

common/matcher/geoip/errors.generated.go

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

common/matcher/geoip/geoip.go

@@ -1,4 +1,4 @@
-package router
+package geoip
 
 import (
 	"encoding/binary"
@@ -7,17 +7,24 @@ import (
 	"github.com/xtls/xray-core/common/net"
 )
 
+//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
+
 type ipv6 struct {
 	a uint64
 	b uint64
 }
 
 type GeoIPMatcher struct {
-	countryCode string
-	ip4         []uint32
-	prefix4     []uint8
-	ip6         []ipv6
-	prefix6     []uint8
+	countryCode  string
+	reverseMatch bool
+	ip4          []uint32
+	prefix4      []uint8
+	ip6          []ipv6
+	prefix6      []uint8
+}
+
+func (m *GeoIPMatcher) SetReverseMatch(isReverseMatch bool) {
+	m.reverseMatch = isReverseMatch
 }
 
 func normalize4(ip uint32, prefix uint8) uint32 {
@@ -147,8 +154,17 @@ func (m *GeoIPMatcher) match6(ip ipv6) bool {
 func (m *GeoIPMatcher) Match(ip net.IP) bool {
 	switch len(ip) {
 	case 4:
+		if m.reverseMatch {
+			return !m.match4(binary.BigEndian.Uint32(ip))
+		}
 		return m.match4(binary.BigEndian.Uint32(ip))
 	case 16:
+		if m.reverseMatch {
+			return !m.match6(ipv6{
+				a: binary.BigEndian.Uint64(ip[0:8]),
+				b: binary.BigEndian.Uint64(ip[8:16]),
+			})
+		}
 		return m.match6(ipv6{
 			a: binary.BigEndian.Uint64(ip[0:8]),
 			b: binary.BigEndian.Uint64(ip[8:16]),
@@ -168,14 +184,15 @@ type GeoIPMatcherContainer struct {
 func (c *GeoIPMatcherContainer) Add(geoip *GeoIP) (*GeoIPMatcher, error) {
 	if len(geoip.CountryCode) > 0 {
 		for _, m := range c.matchers {
-			if m.countryCode == geoip.CountryCode {
+			if m.countryCode == geoip.CountryCode && m.reverseMatch == geoip.ReverseMatch {
 				return m, nil
 			}
 		}
 	}
 
 	m := &GeoIPMatcher{
-		countryCode: geoip.CountryCode,
+		countryCode:  geoip.CountryCode,
+		reverseMatch: geoip.ReverseMatch,
 	}
 	if err := m.Init(geoip.Cidr); err != nil {
 		return nil, err
@@ -187,5 +204,5 @@ func (c *GeoIPMatcherContainer) Add(geoip *GeoIP) (*GeoIPMatcher, error) {
 }
 
 var (
-	globalGeoIPContainer GeoIPMatcherContainer
+	GlobalGeoIPContainer GeoIPMatcherContainer
 )

common/matcher/geoip/geoip.pb.go

@@ -0,0 +1,317 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.25.0
+// 	protoc        v3.15.7
+// source: common/matcher/geoip/geoip.proto
+
+package geoip
+
+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
+
+// IP for routing decision, in CIDR form.
+type CIDR struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// IP address, should be either 4 or 16 bytes.
+	Ip []byte `protobuf:"bytes,1,opt,name=ip,proto3" json:"ip,omitempty"`
+	// Number of leading ones in the network mask.
+	Prefix uint32 `protobuf:"varint,2,opt,name=prefix,proto3" json:"prefix,omitempty"`
+}
+
+func (x *CIDR) Reset() {
+	*x = CIDR{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_common_matcher_geoip_geoip_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *CIDR) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*CIDR) ProtoMessage() {}
+
+func (x *CIDR) ProtoReflect() protoreflect.Message {
+	mi := &file_common_matcher_geoip_geoip_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 CIDR.ProtoReflect.Descriptor instead.
+func (*CIDR) Descriptor() ([]byte, []int) {
+	return file_common_matcher_geoip_geoip_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *CIDR) GetIp() []byte {
+	if x != nil {
+		return x.Ip
+	}
+	return nil
+}
+
+func (x *CIDR) GetPrefix() uint32 {
+	if x != nil {
+		return x.Prefix
+	}
+	return 0
+}
+
+type GeoIP struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	CountryCode  string  `protobuf:"bytes,1,opt,name=country_code,json=countryCode,proto3" json:"country_code,omitempty"`
+	Cidr         []*CIDR `protobuf:"bytes,2,rep,name=cidr,proto3" json:"cidr,omitempty"`
+	ReverseMatch bool    `protobuf:"varint,3,opt,name=reverse_match,json=reverseMatch,proto3" json:"reverse_match,omitempty"`
+}
+
+func (x *GeoIP) Reset() {
+	*x = GeoIP{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_common_matcher_geoip_geoip_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GeoIP) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GeoIP) ProtoMessage() {}
+
+func (x *GeoIP) ProtoReflect() protoreflect.Message {
+	mi := &file_common_matcher_geoip_geoip_proto_msgTypes[1]
+	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 GeoIP.ProtoReflect.Descriptor instead.
+func (*GeoIP) Descriptor() ([]byte, []int) {
+	return file_common_matcher_geoip_geoip_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *GeoIP) GetCountryCode() string {
+	if x != nil {
+		return x.CountryCode
+	}
+	return ""
+}
+
+func (x *GeoIP) GetCidr() []*CIDR {
+	if x != nil {
+		return x.Cidr
+	}
+	return nil
+}
+
+func (x *GeoIP) GetReverseMatch() bool {
+	if x != nil {
+		return x.ReverseMatch
+	}
+	return false
+}
+
+type GeoIPList struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Entry []*GeoIP `protobuf:"bytes,1,rep,name=entry,proto3" json:"entry,omitempty"`
+}
+
+func (x *GeoIPList) Reset() {
+	*x = GeoIPList{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_common_matcher_geoip_geoip_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GeoIPList) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GeoIPList) ProtoMessage() {}
+
+func (x *GeoIPList) ProtoReflect() protoreflect.Message {
+	mi := &file_common_matcher_geoip_geoip_proto_msgTypes[2]
+	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 GeoIPList.ProtoReflect.Descriptor instead.
+func (*GeoIPList) Descriptor() ([]byte, []int) {
+	return file_common_matcher_geoip_geoip_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *GeoIPList) GetEntry() []*GeoIP {
+	if x != nil {
+		return x.Entry
+	}
+	return nil
+}
+
+var File_common_matcher_geoip_geoip_proto protoreflect.FileDescriptor
+
+var file_common_matcher_geoip_geoip_proto_rawDesc = []byte{
+	0x0a, 0x20, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2f, 0x6d, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72,
+	0x2f, 0x67, 0x65, 0x6f, 0x69, 0x70, 0x2f, 0x67, 0x65, 0x6f, 0x69, 0x70, 0x2e, 0x70, 0x72, 0x6f,
+	0x74, 0x6f, 0x12, 0x19, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e,
+	0x6d, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x2e, 0x67, 0x65, 0x6f, 0x69, 0x70, 0x22, 0x2e, 0x0a,
+	0x04, 0x43, 0x49, 0x44, 0x52, 0x12, 0x0e, 0x0a, 0x02, 0x69, 0x70, 0x18, 0x01, 0x20, 0x01, 0x28,
+	0x0c, 0x52, 0x02, 0x69, 0x70, 0x12, 0x16, 0x0a, 0x06, 0x70, 0x72, 0x65, 0x66, 0x69, 0x78, 0x18,
+	0x02, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x06, 0x70, 0x72, 0x65, 0x66, 0x69, 0x78, 0x22, 0x84, 0x01,
+	0x0a, 0x05, 0x47, 0x65, 0x6f, 0x49, 0x50, 0x12, 0x21, 0x0a, 0x0c, 0x63, 0x6f, 0x75, 0x6e, 0x74,
+	0x72, 0x79, 0x5f, 0x63, 0x6f, 0x64, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0b, 0x63,
+	0x6f, 0x75, 0x6e, 0x74, 0x72, 0x79, 0x43, 0x6f, 0x64, 0x65, 0x12, 0x33, 0x0a, 0x04, 0x63, 0x69,
+	0x64, 0x72, 0x18, 0x02, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x1f, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e,
+	0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x6d, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x2e, 0x67,
+	0x65, 0x6f, 0x69, 0x70, 0x2e, 0x43, 0x49, 0x44, 0x52, 0x52, 0x04, 0x63, 0x69, 0x64, 0x72, 0x12,
+	0x23, 0x0a, 0x0d, 0x72, 0x65, 0x76, 0x65, 0x72, 0x73, 0x65, 0x5f, 0x6d, 0x61, 0x74, 0x63, 0x68,
+	0x18, 0x03, 0x20, 0x01, 0x28, 0x08, 0x52, 0x0c, 0x72, 0x65, 0x76, 0x65, 0x72, 0x73, 0x65, 0x4d,
+	0x61, 0x74, 0x63, 0x68, 0x22, 0x43, 0x0a, 0x09, 0x47, 0x65, 0x6f, 0x49, 0x50, 0x4c, 0x69, 0x73,
+	0x74, 0x12, 0x36, 0x0a, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b,
+	0x32, 0x20, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x6d,
+	0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x2e, 0x67, 0x65, 0x6f, 0x69, 0x70, 0x2e, 0x47, 0x65, 0x6f,
+	0x49, 0x50, 0x52, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79, 0x42, 0x6d, 0x0a, 0x1d, 0x63, 0x6f, 0x6d,
+	0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x6d, 0x61, 0x74,
+	0x63, 0x68, 0x65, 0x72, 0x2e, 0x67, 0x65, 0x6f, 0x69, 0x70, 0x50, 0x01, 0x5a, 0x2e, 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, 0x6d,
+	0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x2f, 0x67, 0x65, 0x6f, 0x69, 0x70, 0xaa, 0x02, 0x19, 0x58,
+	0x72, 0x61, 0x79, 0x2e, 0x43, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x4d, 0x61, 0x74, 0x63, 0x68,
+	0x65, 0x72, 0x2e, 0x47, 0x65, 0x6f, 0x49, 0x50, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_common_matcher_geoip_geoip_proto_rawDescOnce sync.Once
+	file_common_matcher_geoip_geoip_proto_rawDescData = file_common_matcher_geoip_geoip_proto_rawDesc
+)
+
+func file_common_matcher_geoip_geoip_proto_rawDescGZIP() []byte {
+	file_common_matcher_geoip_geoip_proto_rawDescOnce.Do(func() {
+		file_common_matcher_geoip_geoip_proto_rawDescData = protoimpl.X.CompressGZIP(file_common_matcher_geoip_geoip_proto_rawDescData)
+	})
+	return file_common_matcher_geoip_geoip_proto_rawDescData
+}
+
+var file_common_matcher_geoip_geoip_proto_msgTypes = make([]protoimpl.MessageInfo, 3)
+var file_common_matcher_geoip_geoip_proto_goTypes = []interface{}{
+	(*CIDR)(nil),      // 0: xray.common.matcher.geoip.CIDR
+	(*GeoIP)(nil),     // 1: xray.common.matcher.geoip.GeoIP
+	(*GeoIPList)(nil), // 2: xray.common.matcher.geoip.GeoIPList
+}
+var file_common_matcher_geoip_geoip_proto_depIdxs = []int32{
+	0, // 0: xray.common.matcher.geoip.GeoIP.cidr:type_name -> xray.common.matcher.geoip.CIDR
+	1, // 1: xray.common.matcher.geoip.GeoIPList.entry:type_name -> xray.common.matcher.geoip.GeoIP
+	2, // [2:2] is the sub-list for method output_type
+	2, // [2:2] is the sub-list for method input_type
+	2, // [2:2] is the sub-list for extension type_name
+	2, // [2:2] is the sub-list for extension extendee
+	0, // [0:2] is the sub-list for field type_name
+}
+
+func init() { file_common_matcher_geoip_geoip_proto_init() }
+func file_common_matcher_geoip_geoip_proto_init() {
+	if File_common_matcher_geoip_geoip_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_common_matcher_geoip_geoip_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*CIDR); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_common_matcher_geoip_geoip_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GeoIP); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_common_matcher_geoip_geoip_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GeoIPList); 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_common_matcher_geoip_geoip_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   3,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_common_matcher_geoip_geoip_proto_goTypes,
+		DependencyIndexes: file_common_matcher_geoip_geoip_proto_depIdxs,
+		MessageInfos:      file_common_matcher_geoip_geoip_proto_msgTypes,
+	}.Build()
+	File_common_matcher_geoip_geoip_proto = out.File
+	file_common_matcher_geoip_geoip_proto_rawDesc = nil
+	file_common_matcher_geoip_geoip_proto_goTypes = nil
+	file_common_matcher_geoip_geoip_proto_depIdxs = nil
+}

common/matcher/geoip/geoip.proto

@@ -0,0 +1,26 @@
+syntax = "proto3";
+
+package xray.common.matcher.geoip;
+option csharp_namespace = "Xray.Common.Matcher.GeoIP";
+option go_package = "github.com/xtls/xray-core/common/matcher/geoip";
+option java_package = "com.xray.common.matcher.geoip";
+option java_multiple_files = true;
+
+// IP for routing decision, in CIDR form.
+message CIDR {
+  // IP address, should be either 4 or 16 bytes.
+  bytes ip = 1;
+
+  // Number of leading ones in the network mask.
+  uint32 prefix = 2;
+}
+
+message GeoIP {
+  string country_code = 1;
+  repeated CIDR cidr = 2;
+  bool reverse_match =3;
+}
+
+message GeoIPList {
+  repeated GeoIP entry = 1;
+}

common/matcher/geoip/geoip_test.go

@@ -1,16 +1,16 @@
-package router_test
+package geoip_test
 
 import (
 	"os"
 	"path/filepath"
 	"testing"
 
-	"github.com/golang/protobuf/proto"
-	"github.com/xtls/xray-core/app/router"
 	"github.com/xtls/xray-core/common"
+	. "github.com/xtls/xray-core/common/matcher/geoip"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/platform"
 	"github.com/xtls/xray-core/common/platform/filesystem"
+	"google.golang.org/protobuf/proto"
 )
 
 func init() {
@@ -18,27 +18,47 @@ 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, "..", "..", "resources", "geoip.dat")))
+		common.Must(filesystem.CopyFile(platform.GetAssetLocation("geoip.dat"), filepath.Join(wd, "..", "..", "..", "resources", "geoip.dat")))
+	}
+	if _, err := os.Stat(platform.GetAssetLocation("geoiptestrouter.dat")); err != nil && os.IsNotExist(err) {
+		common.Must(filesystem.CopyFile(platform.GetAssetLocation("geoiptestrouter.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, "..", "..", "resources", "geosite.dat")))
+		common.Must(filesystem.CopyFile(platform.GetAssetLocation("geosite.dat"), filepath.Join(wd, "..", "..", "..", "resources", "geosite.dat")))
+	}
+}
+
+func TestParseIPList(t *testing.T) {
+	ips := []string{
+		"geoip:us",
+		"geoip:cn",
+		"geoip:!cn",
+		"ext:geoiptestrouter.dat:!cn",
+		"ext:geoiptestrouter.dat:ca",
+		"ext-ip:geoiptestrouter.dat:!cn",
+		"ext-ip:geoiptestrouter.dat:!ca",
+	}
+
+	_, err := ParseIPList(ips)
+	if err != nil {
+		t.Fatalf("Failed to parse geoip list, got %s", err)
 	}
 }
 
 func TestGeoIPMatcherContainer(t *testing.T) {
-	container := &router.GeoIPMatcherContainer{}
+	container := &GeoIPMatcherContainer{}
 
-	m1, err := container.Add(&router.GeoIP{
+	m1, err := container.Add(&GeoIP{
 		CountryCode: "CN",
 	})
 	common.Must(err)
 
-	m2, err := container.Add(&router.GeoIP{
+	m2, err := container.Add(&GeoIP{
 		CountryCode: "US",
 	})
 	common.Must(err)
 
-	m3, err := container.Add(&router.GeoIP{
+	m3, err := container.Add(&GeoIP{
 		CountryCode: "CN",
 	})
 	common.Must(err)
@@ -53,7 +73,7 @@ func TestGeoIPMatcherContainer(t *testing.T) {
 }
 
 func TestGeoIPMatcher(t *testing.T) {
-	cidrList := router.CIDRList{
+	cidrList := CIDRList{
 		{Ip: []byte{0, 0, 0, 0}, Prefix: 8},
 		{Ip: []byte{10, 0, 0, 0}, Prefix: 8},
 		{Ip: []byte{100, 64, 0, 0}, Prefix: 10},
@@ -70,7 +90,7 @@ func TestGeoIPMatcher(t *testing.T) {
 		{Ip: []byte{91, 108, 4, 0}, Prefix: 16},
 	}
 
-	matcher := &router.GeoIPMatcher{}
+	matcher := &GeoIPMatcher{}
 	common.Must(matcher.Init(cidrList))
 
 	testCases := []struct {
@@ -123,11 +143,47 @@ func TestGeoIPMatcher(t *testing.T) {
 	}
 }
 
+func TestGeoIPReverseMatcher(t *testing.T) {
+	cidrList := CIDRList{
+		{Ip: []byte{8, 8, 8, 8}, Prefix: 32},
+		{Ip: []byte{91, 108, 4, 0}, Prefix: 16},
+	}
+	matcher := &GeoIPMatcher{}
+	matcher.SetReverseMatch(true) // Reverse match
+	common.Must(matcher.Init(cidrList))
+
+	testCases := []struct {
+		Input  string
+		Output bool
+	}{
+		{
+			Input:  "8.8.8.8",
+			Output: false,
+		},
+		{
+			Input:  "2001:cdba::3257:9652",
+			Output: true,
+		},
+		{
+			Input:  "91.108.255.254",
+			Output: false,
+		},
+	}
+
+	for _, testCase := range testCases {
+		ip := net.ParseAddress(testCase.Input).IP()
+		actual := matcher.Match(ip)
+		if actual != testCase.Output {
+			t.Error("expect input", testCase.Input, "to be", testCase.Output, ", but actually", actual)
+		}
+	}
+}
+
 func TestGeoIPMatcher4CN(t *testing.T) {
 	ips, err := loadGeoIP("CN")
 	common.Must(err)
 
-	matcher := &router.GeoIPMatcher{}
+	matcher := &GeoIPMatcher{}
 	common.Must(matcher.Init(ips))
 
 	if matcher.Match([]byte{8, 8, 8, 8}) {
@@ -139,7 +195,7 @@ func TestGeoIPMatcher6US(t *testing.T) {
 	ips, err := loadGeoIP("US")
 	common.Must(err)
 
-	matcher := &router.GeoIPMatcher{}
+	matcher := &GeoIPMatcher{}
 	common.Must(matcher.Init(ips))
 
 	if !matcher.Match(net.ParseAddress("2001:4860:4860::8888").IP()) {
@@ -147,12 +203,12 @@ func TestGeoIPMatcher6US(t *testing.T) {
 	}
 }
 
-func loadGeoIP(country string) ([]*router.CIDR, error) {
+func loadGeoIP(country string) ([]*CIDR, error) {
 	geoipBytes, err := filesystem.ReadAsset("geoip.dat")
 	if err != nil {
 		return nil, err
 	}
-	var geoipList router.GeoIPList
+	var geoipList GeoIPList
 	if err := proto.Unmarshal(geoipBytes, &geoipList); err != nil {
 		return nil, err
 	}
@@ -170,7 +226,7 @@ func BenchmarkGeoIPMatcher4CN(b *testing.B) {
 	ips, err := loadGeoIP("CN")
 	common.Must(err)
 
-	matcher := &router.GeoIPMatcher{}
+	matcher := &GeoIPMatcher{}
 	common.Must(matcher.Init(ips))
 
 	b.ResetTimer()
@@ -184,7 +240,7 @@ func BenchmarkGeoIPMatcher6US(b *testing.B) {
 	ips, err := loadGeoIP("US")
 	common.Must(err)
 
-	matcher := &router.GeoIPMatcher{}
+	matcher := &GeoIPMatcher{}
 	common.Must(matcher.Init(ips))
 
 	b.ResetTimer()

common/matcher/geoip/matcher.go

@@ -0,0 +1,57 @@
+package geoip
+
+import (
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/features/routing"
+)
+
+type MultiGeoIPMatcher struct {
+	matchers []*GeoIPMatcher
+	onSource bool
+}
+
+func NewMultiGeoIPMatcher(geoips []*GeoIP, onSource bool) (*MultiGeoIPMatcher, error) {
+	var matchers []*GeoIPMatcher
+	for _, geoip := range geoips {
+		matcher, err := GlobalGeoIPContainer.Add(geoip)
+		if err != nil {
+			return nil, err
+		}
+		matchers = append(matchers, matcher)
+	}
+
+	matcher := &MultiGeoIPMatcher{
+		matchers: matchers,
+		onSource: onSource,
+	}
+
+	return matcher, nil
+}
+
+// Apply implements Condition.
+func (m *MultiGeoIPMatcher) Apply(ctx routing.Context) bool {
+	var ips []net.IP
+	if m.onSource {
+		ips = ctx.GetSourceIPs()
+	} else {
+		ips = ctx.GetTargetIPs()
+	}
+	for _, ip := range ips {
+		for _, matcher := range m.matchers {
+			if matcher.Match(ip) {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+// MatchIP match given ip.
+func (m *MultiGeoIPMatcher) MatchIP(ip net.IP) bool {
+	for _, matcher := range m.matchers {
+		if matcher.Match(ip) {
+			return true
+		}
+	}
+	return false
+}

common/matcher/geosite/attribute.go

@@ -0,0 +1,35 @@
+package geosite
+
+import "strings"
+
+type AttributeList struct {
+	matcher []AttributeMatcher
+}
+
+func (al *AttributeList) Match(domain *Domain) bool {
+	for _, matcher := range al.matcher {
+		if !matcher.Match(domain) {
+			return false
+		}
+	}
+	return true
+}
+
+func (al *AttributeList) IsEmpty() bool {
+	return len(al.matcher) == 0
+}
+
+type AttributeMatcher interface {
+	Match(*Domain) bool
+}
+
+type BooleanMatcher string
+
+func (m BooleanMatcher) Match(domain *Domain) bool {
+	for _, attr := range domain.Attribute {
+		if strings.EqualFold(attr.GetKey(), string(m)) {
+			return true
+		}
+	}
+	return false
+}

common/matcher/geosite/conf.go

@@ -0,0 +1,42 @@
+package geosite
+
+import (
+	"strings"
+
+	dm "github.com/xtls/xray-core/common/matcher/domain"
+)
+
+func LoadGeositeWithAttr(file string, siteWithAttr string) ([]*dm.Domain, error) {
+	parts := strings.Split(siteWithAttr, "@")
+	if len(parts) == 0 {
+		return nil, newError("empty site")
+	}
+	country := strings.ToUpper(parts[0])
+	attrs := parseAttrs(parts[1:])
+	domains, err := loadSite(file, country)
+	if err != nil {
+		return nil, err
+	}
+
+	if attrs.IsEmpty() {
+		return ToDomains(domains), nil
+	}
+
+	filteredDomains := make([]*dm.Domain, 0, len(domains))
+	for _, domain := range domains {
+		if attrs.Match(domain) {
+			filteredDomains = append(filteredDomains, domain.ToDomain())
+		}
+	}
+
+	return filteredDomains, nil
+}
+
+func parseAttrs(attrs []string) *AttributeList {
+	al := new(AttributeList)
+	for _, attr := range attrs {
+		lc := strings.ToLower(attr)
+		al.matcher = append(al.matcher, BooleanMatcher(lc))
+	}
+	return al
+}

common/matcher/geosite/errors.generated.go

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

common/matcher/geosite/file.go

@@ -0,0 +1,86 @@
+package geosite
+
+import (
+	"runtime"
+
+	"github.com/golang/protobuf/proto"
+	"github.com/xtls/xray-core/common/platform/filesystem"
+)
+
+var (
+	SiteCache = make(map[string]*GeoSite)
+	FileCache = make(map[string][]byte)
+)
+
+func loadFile(file string) ([]byte, error) {
+	if FileCache[file] == nil {
+		bs, err := filesystem.ReadAsset(file)
+		if err != nil {
+			return nil, newError("failed to open file: ", file).Base(err)
+		}
+		if len(bs) == 0 {
+			return nil, newError("empty file: ", file)
+		}
+		// Do not cache file, may save RAM when there
+		// are many files, but consume CPU each time.
+		return bs, nil
+		FileCache[file] = bs
+	}
+	return FileCache[file], nil
+}
+
+func loadSite(file, code string) ([]*Domain, error) {
+	index := file + ":" + code
+	if SiteCache[index] == nil {
+		bs, err := loadFile(file)
+		if err != nil {
+			return nil, newError("failed to load file: ", file).Base(err)
+		}
+		bs = find(bs, []byte(code))
+		if bs == nil {
+			return nil, newError("list not found in ", file, ": ", code)
+		}
+		var ges GeoSite
+		if err := proto.Unmarshal(bs, &ges); err != nil {
+			return nil, newError("error unmarshal Site in ", file, ": ", code).Base(err)
+		}
+		defer runtime.GC()     // or debug.FreeOSMemory()
+		return ges.Domain, nil // do not cache geosite
+		SiteCache[index] = &ges
+	}
+	return SiteCache[index].Domain, nil
+}
+
+func find(data, code []byte) []byte {
+	codeL := len(code)
+	if codeL == 0 {
+		return nil
+	}
+	for {
+		dataL := len(data)
+		if dataL < 2 {
+			return nil
+		}
+		x, y := proto.DecodeVarint(data[1:])
+		if x == 0 && y == 0 {
+			return nil
+		}
+		headL, bodyL := 1+y, int(x)
+		dataL -= headL
+		if dataL < bodyL {
+			return nil
+		}
+		data = data[headL:]
+		if int(data[1]) == codeL {
+			for i := 0; i < codeL && data[2+i] == code[i]; i++ {
+				if i+1 == codeL {
+					return data[:bodyL]
+				}
+			}
+		}
+		if dataL == bodyL {
+			return nil
+		}
+		data = data[bodyL:]
+	}
+}

common/matcher/geosite/geosite.go

@@ -0,0 +1,33 @@
+package geosite
+
+import "github.com/xtls/xray-core/common/matcher/domain"
+
+//go:generate go run github.com/xtls/xray-core/common/errors/errorgen
+
+func ToDomains(dms []*Domain) []*domain.Domain {
+	dm := make([]*domain.Domain, len(dms))
+
+	for idx, entry := range dms {
+		dm[idx] = entry.ToDomain()
+	}
+
+	return dm
+}
+
+func (d *Domain) ToDomain() *domain.Domain {
+	return &domain.Domain{Type: d.Type.ToMatchingType(), Value: d.Value}
+}
+
+func (t Domain_Type) ToMatchingType() domain.MatchingType {
+	switch t {
+	case Domain_Plain:
+		return domain.MatchingType_Keyword
+	case Domain_Regex:
+		return domain.MatchingType_Regex
+	case Domain_Domain:
+		return domain.MatchingType_Subdomain
+	case Domain_Full:
+		return domain.MatchingType_Full
+	}
+	panic("impossible")
+}

common/matcher/geosite/geosite.pb.go

@@ -0,0 +1,501 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.25.0
+// 	protoc        v3.15.6
+// source: common/matcher/geosite/geosite.proto
+
+package geosite
+
+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 Domain_Type int32
+
+const (
+	// The value is used as is.
+	Domain_Plain Domain_Type = 0
+	// The value is used as a regular expression.
+	Domain_Regex Domain_Type = 1
+	// The value is a root domain.
+	Domain_Domain Domain_Type = 2
+	// The value is a domain.
+	Domain_Full Domain_Type = 3
+)
+
+// Enum value maps for Domain_Type.
+var (
+	Domain_Type_name = map[int32]string{
+		0: "Plain",
+		1: "Regex",
+		2: "Domain",
+		3: "Full",
+	}
+	Domain_Type_value = map[string]int32{
+		"Plain":  0,
+		"Regex":  1,
+		"Domain": 2,
+		"Full":   3,
+	}
+)
+
+func (x Domain_Type) Enum() *Domain_Type {
+	p := new(Domain_Type)
+	*p = x
+	return p
+}
+
+func (x Domain_Type) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (Domain_Type) Descriptor() protoreflect.EnumDescriptor {
+	return file_common_matcher_geosite_geosite_proto_enumTypes[0].Descriptor()
+}
+
+func (Domain_Type) Type() protoreflect.EnumType {
+	return &file_common_matcher_geosite_geosite_proto_enumTypes[0]
+}
+
+func (x Domain_Type) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Use Domain_Type.Descriptor instead.
+func (Domain_Type) EnumDescriptor() ([]byte, []int) {
+	return file_common_matcher_geosite_geosite_proto_rawDescGZIP(), []int{0, 0}
+}
+
+type Domain struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Domain matching type.
+	Type Domain_Type `protobuf:"varint,1,opt,name=type,proto3,enum=xray.common.matcher.geosite.Domain_Type" json:"type,omitempty"`
+	// Domain value.
+	Value string `protobuf:"bytes,2,opt,name=value,proto3" json:"value,omitempty"`
+	// Attributes of this domain. May be used for filtering.
+	Attribute []*Domain_Attribute `protobuf:"bytes,3,rep,name=attribute,proto3" json:"attribute,omitempty"`
+}
+
+func (x *Domain) Reset() {
+	*x = Domain{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_common_matcher_geosite_geosite_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Domain) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Domain) ProtoMessage() {}
+
+func (x *Domain) ProtoReflect() protoreflect.Message {
+	mi := &file_common_matcher_geosite_geosite_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 Domain.ProtoReflect.Descriptor instead.
+func (*Domain) Descriptor() ([]byte, []int) {
+	return file_common_matcher_geosite_geosite_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Domain) GetType() Domain_Type {
+	if x != nil {
+		return x.Type
+	}
+	return Domain_Plain
+}
+
+func (x *Domain) GetValue() string {
+	if x != nil {
+		return x.Value
+	}
+	return ""
+}
+
+func (x *Domain) GetAttribute() []*Domain_Attribute {
+	if x != nil {
+		return x.Attribute
+	}
+	return nil
+}
+
+type GeoSite struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	CountryCode string    `protobuf:"bytes,1,opt,name=country_code,json=countryCode,proto3" json:"country_code,omitempty"`
+	Domain      []*Domain `protobuf:"bytes,2,rep,name=domain,proto3" json:"domain,omitempty"`
+}
+
+func (x *GeoSite) Reset() {
+	*x = GeoSite{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_common_matcher_geosite_geosite_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GeoSite) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GeoSite) ProtoMessage() {}
+
+func (x *GeoSite) ProtoReflect() protoreflect.Message {
+	mi := &file_common_matcher_geosite_geosite_proto_msgTypes[1]
+	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 GeoSite.ProtoReflect.Descriptor instead.
+func (*GeoSite) Descriptor() ([]byte, []int) {
+	return file_common_matcher_geosite_geosite_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *GeoSite) GetCountryCode() string {
+	if x != nil {
+		return x.CountryCode
+	}
+	return ""
+}
+
+func (x *GeoSite) GetDomain() []*Domain {
+	if x != nil {
+		return x.Domain
+	}
+	return nil
+}
+
+type GeoSiteList struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Entry []*GeoSite `protobuf:"bytes,1,rep,name=entry,proto3" json:"entry,omitempty"`
+}
+
+func (x *GeoSiteList) Reset() {
+	*x = GeoSiteList{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_common_matcher_geosite_geosite_proto_msgTypes[2]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GeoSiteList) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GeoSiteList) ProtoMessage() {}
+
+func (x *GeoSiteList) ProtoReflect() protoreflect.Message {
+	mi := &file_common_matcher_geosite_geosite_proto_msgTypes[2]
+	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 GeoSiteList.ProtoReflect.Descriptor instead.
+func (*GeoSiteList) Descriptor() ([]byte, []int) {
+	return file_common_matcher_geosite_geosite_proto_rawDescGZIP(), []int{2}
+}
+
+func (x *GeoSiteList) GetEntry() []*GeoSite {
+	if x != nil {
+		return x.Entry
+	}
+	return nil
+}
+
+type Domain_Attribute struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Key string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
+	// Types that are assignable to TypedValue:
+	//	*Domain_Attribute_BoolValue
+	//	*Domain_Attribute_IntValue
+	TypedValue isDomain_Attribute_TypedValue `protobuf_oneof:"typed_value"`
+}
+
+func (x *Domain_Attribute) Reset() {
+	*x = Domain_Attribute{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_common_matcher_geosite_geosite_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Domain_Attribute) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Domain_Attribute) ProtoMessage() {}
+
+func (x *Domain_Attribute) ProtoReflect() protoreflect.Message {
+	mi := &file_common_matcher_geosite_geosite_proto_msgTypes[3]
+	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 Domain_Attribute.ProtoReflect.Descriptor instead.
+func (*Domain_Attribute) Descriptor() ([]byte, []int) {
+	return file_common_matcher_geosite_geosite_proto_rawDescGZIP(), []int{0, 0}
+}
+
+func (x *Domain_Attribute) GetKey() string {
+	if x != nil {
+		return x.Key
+	}
+	return ""
+}
+
+func (m *Domain_Attribute) GetTypedValue() isDomain_Attribute_TypedValue {
+	if m != nil {
+		return m.TypedValue
+	}
+	return nil
+}
+
+func (x *Domain_Attribute) GetBoolValue() bool {
+	if x, ok := x.GetTypedValue().(*Domain_Attribute_BoolValue); ok {
+		return x.BoolValue
+	}
+	return false
+}
+
+func (x *Domain_Attribute) GetIntValue() int64 {
+	if x, ok := x.GetTypedValue().(*Domain_Attribute_IntValue); ok {
+		return x.IntValue
+	}
+	return 0
+}
+
+type isDomain_Attribute_TypedValue interface {
+	isDomain_Attribute_TypedValue()
+}
+
+type Domain_Attribute_BoolValue struct {
+	BoolValue bool `protobuf:"varint,2,opt,name=bool_value,json=boolValue,proto3,oneof"`
+}
+
+type Domain_Attribute_IntValue struct {
+	IntValue int64 `protobuf:"varint,3,opt,name=int_value,json=intValue,proto3,oneof"`
+}
+
+func (*Domain_Attribute_BoolValue) isDomain_Attribute_TypedValue() {}
+
+func (*Domain_Attribute_IntValue) isDomain_Attribute_TypedValue() {}
+
+var File_common_matcher_geosite_geosite_proto protoreflect.FileDescriptor
+
+var file_common_matcher_geosite_geosite_proto_rawDesc = []byte{
+	0x0a, 0x24, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2f, 0x6d, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72,
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+	0x03, 0x22, 0x69, 0x0a, 0x07, 0x47, 0x65, 0x6f, 0x53, 0x69, 0x74, 0x65, 0x12, 0x21, 0x0a, 0x0c,
+	0x63, 0x6f, 0x75, 0x6e, 0x74, 0x72, 0x79, 0x5f, 0x63, 0x6f, 0x64, 0x65, 0x18, 0x01, 0x20, 0x01,
+	0x28, 0x09, 0x52, 0x0b, 0x63, 0x6f, 0x75, 0x6e, 0x74, 0x72, 0x79, 0x43, 0x6f, 0x64, 0x65, 0x12,
+	0x3b, 0x0a, 0x06, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x18, 0x02, 0x20, 0x03, 0x28, 0x0b, 0x32,
+	0x23, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x6d, 0x61,
+	0x74, 0x63, 0x68, 0x65, 0x72, 0x2e, 0x67, 0x65, 0x6f, 0x73, 0x69, 0x74, 0x65, 0x2e, 0x44, 0x6f,
+	0x6d, 0x61, 0x69, 0x6e, 0x52, 0x06, 0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x22, 0x49, 0x0a, 0x0b,
+	0x47, 0x65, 0x6f, 0x53, 0x69, 0x74, 0x65, 0x4c, 0x69, 0x73, 0x74, 0x12, 0x3a, 0x0a, 0x05, 0x65,
+	0x6e, 0x74, 0x72, 0x79, 0x18, 0x01, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x24, 0x2e, 0x78, 0x72, 0x61,
+	0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x6d, 0x61, 0x74, 0x63, 0x68, 0x65, 0x72,
+	0x2e, 0x67, 0x65, 0x6f, 0x73, 0x69, 0x74, 0x65, 0x2e, 0x47, 0x65, 0x6f, 0x53, 0x69, 0x74, 0x65,
+	0x52, 0x05, 0x65, 0x6e, 0x74, 0x72, 0x79, 0x42, 0x73, 0x0a, 0x1f, 0x63, 0x6f, 0x6d, 0x2e, 0x78,
+	0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x6d, 0x61, 0x74, 0x63, 0x68,
+	0x65, 0x72, 0x2e, 0x67, 0x65, 0x6f, 0x73, 0x69, 0x74, 0x65, 0x50, 0x01, 0x5a, 0x30, 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, 0x6d,
+	0x61, 0x74, 0x63, 0x68, 0x65, 0x72, 0x2f, 0x67, 0x65, 0x6f, 0x73, 0x69, 0x74, 0x65, 0xaa, 0x02,
+	0x1b, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x43, 0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x4d, 0x61, 0x74,
+	0x63, 0x68, 0x65, 0x72, 0x2e, 0x47, 0x65, 0x6f, 0x53, 0x69, 0x74, 0x65, 0x62, 0x06, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_common_matcher_geosite_geosite_proto_rawDescOnce sync.Once
+	file_common_matcher_geosite_geosite_proto_rawDescData = file_common_matcher_geosite_geosite_proto_rawDesc
+)
+
+func file_common_matcher_geosite_geosite_proto_rawDescGZIP() []byte {
+	file_common_matcher_geosite_geosite_proto_rawDescOnce.Do(func() {
+		file_common_matcher_geosite_geosite_proto_rawDescData = protoimpl.X.CompressGZIP(file_common_matcher_geosite_geosite_proto_rawDescData)
+	})
+	return file_common_matcher_geosite_geosite_proto_rawDescData
+}
+
+var file_common_matcher_geosite_geosite_proto_enumTypes = make([]protoimpl.EnumInfo, 1)
+var file_common_matcher_geosite_geosite_proto_msgTypes = make([]protoimpl.MessageInfo, 4)
+var file_common_matcher_geosite_geosite_proto_goTypes = []interface{}{
+	(Domain_Type)(0),         // 0: xray.common.matcher.geosite.Domain.Type
+	(*Domain)(nil),           // 1: xray.common.matcher.geosite.Domain
+	(*GeoSite)(nil),          // 2: xray.common.matcher.geosite.GeoSite
+	(*GeoSiteList)(nil),      // 3: xray.common.matcher.geosite.GeoSiteList
+	(*Domain_Attribute)(nil), // 4: xray.common.matcher.geosite.Domain.Attribute
+}
+var file_common_matcher_geosite_geosite_proto_depIdxs = []int32{
+	0, // 0: xray.common.matcher.geosite.Domain.type:type_name -> xray.common.matcher.geosite.Domain.Type
+	4, // 1: xray.common.matcher.geosite.Domain.attribute:type_name -> xray.common.matcher.geosite.Domain.Attribute
+	1, // 2: xray.common.matcher.geosite.GeoSite.domain:type_name -> xray.common.matcher.geosite.Domain
+	2, // 3: xray.common.matcher.geosite.GeoSiteList.entry:type_name -> xray.common.matcher.geosite.GeoSite
+	4, // [4:4] is the sub-list for method output_type
+	4, // [4:4] is the sub-list for method input_type
+	4, // [4:4] is the sub-list for extension type_name
+	4, // [4:4] is the sub-list for extension extendee
+	0, // [0:4] is the sub-list for field type_name
+}
+
+func init() { file_common_matcher_geosite_geosite_proto_init() }
+func file_common_matcher_geosite_geosite_proto_init() {
+	if File_common_matcher_geosite_geosite_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_common_matcher_geosite_geosite_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Domain); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_common_matcher_geosite_geosite_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GeoSite); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_common_matcher_geosite_geosite_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GeoSiteList); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_common_matcher_geosite_geosite_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Domain_Attribute); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	file_common_matcher_geosite_geosite_proto_msgTypes[3].OneofWrappers = []interface{}{
+		(*Domain_Attribute_BoolValue)(nil),
+		(*Domain_Attribute_IntValue)(nil),
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_common_matcher_geosite_geosite_proto_rawDesc,
+			NumEnums:      1,
+			NumMessages:   4,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_common_matcher_geosite_geosite_proto_goTypes,
+		DependencyIndexes: file_common_matcher_geosite_geosite_proto_depIdxs,
+		EnumInfos:         file_common_matcher_geosite_geosite_proto_enumTypes,
+		MessageInfos:      file_common_matcher_geosite_geosite_proto_msgTypes,
+	}.Build()
+	File_common_matcher_geosite_geosite_proto = out.File
+	file_common_matcher_geosite_geosite_proto_rawDesc = nil
+	file_common_matcher_geosite_geosite_proto_goTypes = nil
+	file_common_matcher_geosite_geosite_proto_depIdxs = nil
+}

common/matcher/geosite/geosite.proto

@@ -0,0 +1,46 @@
+syntax = "proto3";
+
+package xray.common.matcher.geosite;
+option csharp_namespace = "Xray.Common.Matcher.GeoSite";
+option go_package = "github.com/xtls/xray-core/common/matcher/geosite";
+option java_package = "com.xray.common.matcher.geosite";
+option java_multiple_files = true;
+
+message Domain {
+  enum Type {
+    // The value is used as is.
+    Plain = 0;
+    // The value is used as a regular expression.
+    Regex = 1;
+    // The value is a root domain.
+    Domain = 2;
+    // The value is a domain.
+    Full = 3;
+  }
+  // Domain matching type.
+  Type type = 1;
+
+  // Domain value.
+  string value = 2;
+
+  message Attribute {
+    string key = 1;
+
+    oneof typed_value {
+      bool bool_value = 2;
+      int64 int_value = 3;
+    }
+  }
+
+  // Attributes of this domain. May be used for filtering.
+  repeated Attribute attribute = 3;
+}
+
+message GeoSite {
+  string country_code = 1;
+  repeated Domain domain = 2;
+}
+
+message GeoSiteList {
+  repeated GeoSite entry = 1;
+}

common/matcher/str/ac_automaton_matcher.go

@@ -0,0 +1,243 @@
+package str
+
+import (
+	"container/list"
+)
+
+const validCharCount = 53
+
+type MatchType struct {
+	matchType Type
+	exist     bool
+}
+
+const (
+	TrieEdge bool = true
+	FailEdge bool = false
+)
+
+type Edge struct {
+	edgeType bool
+	nextNode int
+}
+
+type ACAutomaton struct {
+	trie   [][validCharCount]Edge
+	fail   []int
+	exists []MatchType
+	count  int
+}
+
+func newNode() [validCharCount]Edge {
+	var s [validCharCount]Edge
+	for i := range s {
+		s[i] = Edge{
+			edgeType: FailEdge,
+			nextNode: 0,
+		}
+	}
+	return s
+}
+
+var char2Index = []int{
+	'A':  0,
+	'a':  0,
+	'B':  1,
+	'b':  1,
+	'C':  2,
+	'c':  2,
+	'D':  3,
+	'd':  3,
+	'E':  4,
+	'e':  4,
+	'F':  5,
+	'f':  5,
+	'G':  6,
+	'g':  6,
+	'H':  7,
+	'h':  7,
+	'I':  8,
+	'i':  8,
+	'J':  9,
+	'j':  9,
+	'K':  10,
+	'k':  10,
+	'L':  11,
+	'l':  11,
+	'M':  12,
+	'm':  12,
+	'N':  13,
+	'n':  13,
+	'O':  14,
+	'o':  14,
+	'P':  15,
+	'p':  15,
+	'Q':  16,
+	'q':  16,
+	'R':  17,
+	'r':  17,
+	'S':  18,
+	's':  18,
+	'T':  19,
+	't':  19,
+	'U':  20,
+	'u':  20,
+	'V':  21,
+	'v':  21,
+	'W':  22,
+	'w':  22,
+	'X':  23,
+	'x':  23,
+	'Y':  24,
+	'y':  24,
+	'Z':  25,
+	'z':  25,
+	'!':  26,
+	'$':  27,
+	'&':  28,
+	'\'': 29,
+	'(':  30,
+	')':  31,
+	'*':  32,
+	'+':  33,
+	',':  34,
+	';':  35,
+	'=':  36,
+	':':  37,
+	'%':  38,
+	'-':  39,
+	'.':  40,
+	'_':  41,
+	'~':  42,
+	'0':  43,
+	'1':  44,
+	'2':  45,
+	'3':  46,
+	'4':  47,
+	'5':  48,
+	'6':  49,
+	'7':  50,
+	'8':  51,
+	'9':  52,
+}
+
+func NewACAutomaton() *ACAutomaton {
+	var ac = new(ACAutomaton)
+	ac.trie = append(ac.trie, newNode())
+	ac.fail = append(ac.fail, 0)
+	ac.exists = append(ac.exists, MatchType{
+		matchType: Full,
+		exist:     false,
+	})
+	return ac
+}
+
+func (ac *ACAutomaton) Add(domain string, t Type) {
+	var node = 0
+	for i := len(domain) - 1; i >= 0; i-- {
+		var idx = char2Index[domain[i]]
+		if ac.trie[node][idx].nextNode == 0 {
+			ac.count++
+			if len(ac.trie) < ac.count+1 {
+				ac.trie = append(ac.trie, newNode())
+				ac.fail = append(ac.fail, 0)
+				ac.exists = append(ac.exists, MatchType{
+					matchType: Full,
+					exist:     false,
+				})
+			}
+			ac.trie[node][idx] = Edge{
+				edgeType: TrieEdge,
+				nextNode: ac.count,
+			}
+		}
+		node = ac.trie[node][idx].nextNode
+	}
+	ac.exists[node] = MatchType{
+		matchType: t,
+		exist:     true,
+	}
+	switch t {
+	case Domain:
+		ac.exists[node] = MatchType{
+			matchType: Full,
+			exist:     true,
+		}
+		var idx = char2Index['.']
+		if ac.trie[node][idx].nextNode == 0 {
+			ac.count++
+			if len(ac.trie) < ac.count+1 {
+				ac.trie = append(ac.trie, newNode())
+				ac.fail = append(ac.fail, 0)
+				ac.exists = append(ac.exists, MatchType{
+					matchType: Full,
+					exist:     false,
+				})
+			}
+			ac.trie[node][idx] = Edge{
+				edgeType: TrieEdge,
+				nextNode: ac.count,
+			}
+		}
+		node = ac.trie[node][idx].nextNode
+		ac.exists[node] = MatchType{
+			matchType: t,
+			exist:     true,
+		}
+	default:
+		break
+	}
+}
+
+func (ac *ACAutomaton) Build() {
+	var queue = list.New()
+	for i := 0; i < validCharCount; i++ {
+		if ac.trie[0][i].nextNode != 0 {
+			queue.PushBack(ac.trie[0][i])
+		}
+	}
+	for {
+		var front = queue.Front()
+		if front == nil {
+			break
+		} else {
+			var node = front.Value.(Edge).nextNode
+			queue.Remove(front)
+			for i := 0; i < validCharCount; i++ {
+				if ac.trie[node][i].nextNode != 0 {
+					ac.fail[ac.trie[node][i].nextNode] = ac.trie[ac.fail[node]][i].nextNode
+					queue.PushBack(ac.trie[node][i])
+				} else {
+					ac.trie[node][i] = Edge{
+						edgeType: FailEdge,
+						nextNode: ac.trie[ac.fail[node]][i].nextNode,
+					}
+				}
+			}
+		}
+	}
+}
+
+func (ac *ACAutomaton) Match(s string) bool {
+	var node = 0
+	var fullMatch = true
+	// 1. the match string is all through trie edge. FULL MATCH or DOMAIN
+	// 2. the match string is through a fail edge. NOT FULL MATCH
+	// 2.1 Through a fail edge, but there exists a valid node. SUBSTR
+	for i := len(s) - 1; i >= 0; i-- {
+		var idx = char2Index[s[i]]
+		fullMatch = fullMatch && ac.trie[node][idx].edgeType
+		node = ac.trie[node][idx].nextNode
+		switch ac.exists[node].matchType {
+		case Substr:
+			return true
+		case Domain:
+			if fullMatch {
+				return true
+			}
+		default:
+			break
+		}
+	}
+	return fullMatch && ac.exists[node].exist
+}

common/matcher/str/benchmark_test.go

@@ -1,13 +1,26 @@
-package strmatcher_test
+package str_test
 
 import (
 	"strconv"
 	"testing"
 
 	"github.com/xtls/xray-core/common"
-	. "github.com/xtls/xray-core/common/strmatcher"
+	. "github.com/xtls/xray-core/common/matcher/str"
 )
 
+func BenchmarkACAutomaton(b *testing.B) {
+	ac := NewACAutomaton()
+	for i := 1; i <= 1024; i++ {
+		ac.Add(strconv.Itoa(i)+".xray.com", Domain)
+	}
+	ac.Build()
+
+	b.ResetTimer()
+	for i := 0; i < b.N; i++ {
+		_ = ac.Match("0.xray.com")
+	}
+}
+
 func BenchmarkDomainMatcherGroup(b *testing.B) {
 	g := new(DomainMatcherGroup)
 

common/matcher/str/domain_matcher.go

@@ -1,4 +1,4 @@
-package strmatcher
+package str
 
 import "strings"
 

common/matcher/str/domain_matcher_test.go

@@ -1,10 +1,10 @@
-package strmatcher_test
+package str_test
 
 import (
 	"reflect"
 	"testing"
 
-	. "github.com/xtls/xray-core/common/strmatcher"
+	. "github.com/xtls/xray-core/common/matcher/str"
 )
 
 func TestDomainMatcherGroup(t *testing.T) {

common/matcher/str/full_matcher.go

@@ -1,4 +1,4 @@
-package strmatcher
+package str
 
 type FullMatcherGroup struct {
 	matchers map[string][]uint32

common/matcher/str/full_matcher_test.go

@@ -1,10 +1,10 @@
-package strmatcher_test
+package str_test
 
 import (
 	"reflect"
 	"testing"
 
-	. "github.com/xtls/xray-core/common/strmatcher"
+	. "github.com/xtls/xray-core/common/matcher/str"
 )
 
 func TestFullMatcherGroup(t *testing.T) {

common/matcher/str/matchers.go

@@ -1,4 +1,4 @@
-package strmatcher
+package str
 
 import (
 	"regexp"

common/matcher/str/matchers_test.go

@@ -1,10 +1,10 @@
-package strmatcher_test
+package str_test
 
 import (
 	"testing"
 
 	"github.com/xtls/xray-core/common"
-	. "github.com/xtls/xray-core/common/strmatcher"
+	. "github.com/xtls/xray-core/common/matcher/str"
 )
 
 func TestMatcher(t *testing.T) {

common/matcher/str/mph_matcher.go

@@ -0,0 +1,301 @@
+package str
+
+import (
+	"math/bits"
+	"regexp"
+	"sort"
+	"strings"
+	"unsafe"
+)
+
+// PrimeRK is the prime base used in Rabin-Karp algorithm.
+const PrimeRK = 16777619
+
+// calculate the rolling murmurHash of given string
+func RollingHash(s string) uint32 {
+	h := uint32(0)
+	for i := len(s) - 1; i >= 0; i-- {
+		h = h*PrimeRK + uint32(s[i])
+	}
+	return h
+}
+
+// A MphMatcherGroup is divided into three parts:
+// 1. `full` and `domain` patterns are matched by Rabin-Karp algorithm and minimal perfect hash table;
+// 2. `substr` patterns are matched by ac automaton;
+// 3. `regex` patterns are matched with the regex library.
+type MphMatcherGroup struct {
+	ac            *ACAutomaton
+	otherMatchers []matcherEntry
+	rules         []string
+	level0        []uint32
+	level0Mask    int
+	level1        []uint32
+	level1Mask    int
+	count         uint32
+	ruleMap       *map[string]uint32
+}
+
+func (g *MphMatcherGroup) AddFullOrDomainPattern(pattern string, t Type) {
+	h := RollingHash(pattern)
+	switch t {
+	case Domain:
+		(*g.ruleMap)["."+pattern] = h*PrimeRK + uint32('.')
+		fallthrough
+	case Full:
+		(*g.ruleMap)[pattern] = h
+	default:
+	}
+}
+
+func NewMphMatcherGroup() *MphMatcherGroup {
+	return &MphMatcherGroup{
+		ac:            nil,
+		otherMatchers: nil,
+		rules:         nil,
+		level0:        nil,
+		level0Mask:    0,
+		level1:        nil,
+		level1Mask:    0,
+		count:         1,
+		ruleMap:       &map[string]uint32{},
+	}
+}
+
+// AddPattern adds a pattern to MphMatcherGroup
+func (g *MphMatcherGroup) AddPattern(pattern string, t Type) (uint32, error) {
+	switch t {
+	case Substr:
+		if g.ac == nil {
+			g.ac = NewACAutomaton()
+		}
+		g.ac.Add(pattern, t)
+	case Full, Domain:
+		pattern = strings.ToLower(pattern)
+		g.AddFullOrDomainPattern(pattern, t)
+	case Regex:
+		r, err := regexp.Compile(pattern)
+		if err != nil {
+			return 0, err
+		}
+		g.otherMatchers = append(g.otherMatchers, matcherEntry{
+			m:  &regexMatcher{pattern: r},
+			id: g.count,
+		})
+	default:
+		panic("Unknown type")
+	}
+	return g.count, nil
+}
+
+// Build builds a minimal perfect hash table and ac automaton from insert rules
+func (g *MphMatcherGroup) Build() {
+	if g.ac != nil {
+		g.ac.Build()
+	}
+	keyLen := len(*g.ruleMap)
+	if keyLen == 0 {
+		keyLen = 1
+		(*g.ruleMap)["empty___"] = RollingHash("empty___")
+	}
+	g.level0 = make([]uint32, nextPow2(keyLen/4))
+	g.level0Mask = len(g.level0) - 1
+	g.level1 = make([]uint32, nextPow2(keyLen))
+	g.level1Mask = len(g.level1) - 1
+	var sparseBuckets = make([][]int, len(g.level0))
+	var ruleIdx int
+	for rule, hash := range *g.ruleMap {
+		n := int(hash) & g.level0Mask
+		g.rules = append(g.rules, rule)
+		sparseBuckets[n] = append(sparseBuckets[n], ruleIdx)
+		ruleIdx++
+	}
+	g.ruleMap = nil
+	var buckets []indexBucket
+	for n, vals := range sparseBuckets {
+		if len(vals) > 0 {
+			buckets = append(buckets, indexBucket{n, vals})
+		}
+	}
+	sort.Sort(bySize(buckets))
+
+	occ := make([]bool, len(g.level1))
+	var tmpOcc []int
+	for _, bucket := range buckets {
+		var seed = uint32(0)
+		for {
+			findSeed := true
+			tmpOcc = tmpOcc[:0]
+			for _, i := range bucket.vals {
+				n := int(strhashFallback(unsafe.Pointer(&g.rules[i]), uintptr(seed))) & g.level1Mask
+				if occ[n] {
+					for _, n := range tmpOcc {
+						occ[n] = false
+					}
+					seed++
+					findSeed = false
+					break
+				}
+				occ[n] = true
+				tmpOcc = append(tmpOcc, n)
+				g.level1[n] = uint32(i)
+			}
+			if findSeed {
+				g.level0[bucket.n] = seed
+				break
+			}
+		}
+	}
+}
+
+func nextPow2(v int) int {
+	if v <= 1 {
+		return 1
+	}
+	const MaxUInt = ^uint(0)
+	n := (MaxUInt >> bits.LeadingZeros(uint(v))) + 1
+	return int(n)
+}
+
+// Lookup searches for s in t and returns its index and whether it was found.
+func (g *MphMatcherGroup) Lookup(h uint32, s string) bool {
+	i0 := int(h) & g.level0Mask
+	seed := g.level0[i0]
+	i1 := int(strhashFallback(unsafe.Pointer(&s), uintptr(seed))) & g.level1Mask
+	n := g.level1[i1]
+	return s == g.rules[int(n)]
+}
+
+// Match implements IndexMatcher.Match.
+func (g *MphMatcherGroup) Match(pattern string) []uint32 {
+	result := []uint32{}
+	hash := uint32(0)
+	for i := len(pattern) - 1; i >= 0; i-- {
+		hash = hash*PrimeRK + uint32(pattern[i])
+		if pattern[i] == '.' {
+			if g.Lookup(hash, pattern[i:]) {
+				result = append(result, 1)
+				return result
+			}
+		}
+	}
+	if g.Lookup(hash, pattern) {
+		result = append(result, 1)
+		return result
+	}
+	if g.ac != nil && g.ac.Match(pattern) {
+		result = append(result, 1)
+		return result
+	}
+	for _, e := range g.otherMatchers {
+		if e.m.Match(pattern) {
+			result = append(result, e.id)
+			return result
+		}
+	}
+	return nil
+}
+
+type indexBucket struct {
+	n    int
+	vals []int
+}
+
+type bySize []indexBucket
+
+func (s bySize) Len() int           { return len(s) }
+func (s bySize) Less(i, j int) bool { return len(s[i].vals) > len(s[j].vals) }
+func (s bySize) Swap(i, j int)      { s[i], s[j] = s[j], s[i] }
+
+type stringStruct struct {
+	str unsafe.Pointer
+	len int
+}
+
+func strhashFallback(a unsafe.Pointer, h uintptr) uintptr {
+	x := (*stringStruct)(a)
+	return memhashFallback(x.str, h, uintptr(x.len))
+}
+
+const (
+	// Constants for multiplication: four random odd 64-bit numbers.
+	m1 = 16877499708836156737
+	m2 = 2820277070424839065
+	m3 = 9497967016996688599
+	m4 = 15839092249703872147
+)
+
+var hashkey = [4]uintptr{1, 1, 1, 1}
+
+func memhashFallback(p unsafe.Pointer, seed, s uintptr) uintptr {
+	h := uint64(seed + s*hashkey[0])
+tail:
+	switch {
+	case s == 0:
+	case s < 4:
+		h ^= uint64(*(*byte)(p))
+		h ^= uint64(*(*byte)(add(p, s>>1))) << 8
+		h ^= uint64(*(*byte)(add(p, s-1))) << 16
+		h = rotl31(h*m1) * m2
+	case s <= 8:
+		h ^= uint64(readUnaligned32(p))
+		h ^= uint64(readUnaligned32(add(p, s-4))) << 32
+		h = rotl31(h*m1) * m2
+	case s <= 16:
+		h ^= readUnaligned64(p)
+		h = rotl31(h*m1) * m2
+		h ^= readUnaligned64(add(p, s-8))
+		h = rotl31(h*m1) * m2
+	case s <= 32:
+		h ^= readUnaligned64(p)
+		h = rotl31(h*m1) * m2
+		h ^= readUnaligned64(add(p, 8))
+		h = rotl31(h*m1) * m2
+		h ^= readUnaligned64(add(p, s-16))
+		h = rotl31(h*m1) * m2
+		h ^= readUnaligned64(add(p, s-8))
+		h = rotl31(h*m1) * m2
+	default:
+		v1 := h
+		v2 := uint64(seed * hashkey[1])
+		v3 := uint64(seed * hashkey[2])
+		v4 := uint64(seed * hashkey[3])
+		for s >= 32 {
+			v1 ^= readUnaligned64(p)
+			v1 = rotl31(v1*m1) * m2
+			p = add(p, 8)
+			v2 ^= readUnaligned64(p)
+			v2 = rotl31(v2*m2) * m3
+			p = add(p, 8)
+			v3 ^= readUnaligned64(p)
+			v3 = rotl31(v3*m3) * m4
+			p = add(p, 8)
+			v4 ^= readUnaligned64(p)
+			v4 = rotl31(v4*m4) * m1
+			p = add(p, 8)
+			s -= 32
+		}
+		h = v1 ^ v2 ^ v3 ^ v4
+		goto tail
+	}
+
+	h ^= h >> 29
+	h *= m3
+	h ^= h >> 32
+	return uintptr(h)
+}
+func add(p unsafe.Pointer, x uintptr) unsafe.Pointer {
+	return unsafe.Pointer(uintptr(p) + x)
+}
+func readUnaligned32(p unsafe.Pointer) uint32 {
+	q := (*[4]byte)(p)
+	return uint32(q[0]) | uint32(q[1])<<8 | uint32(q[2])<<16 | uint32(q[3])<<24
+}
+
+func rotl31(x uint64) uint64 {
+	return (x << 31) | (x >> (64 - 31))
+}
+func readUnaligned64(p unsafe.Pointer) uint64 {
+	q := (*[8]byte)(p)
+	return uint64(q[0]) | uint64(q[1])<<8 | uint64(q[2])<<16 | uint64(q[3])<<24 | uint64(q[4])<<32 | uint64(q[5])<<40 | uint64(q[6])<<48 | uint64(q[7])<<56
+}

common/matcher/str/strmatcher.go

@@ -1,4 +1,4 @@
-package strmatcher
+package str
 
 import (
 	"regexp"
@@ -27,6 +27,7 @@ const (
 
 // New creates a new Matcher based on the given pattern.
 func (t Type) New(pattern string) (Matcher, error) {
+	// 1. regex matching is case-sensitive
 	switch t {
 	case Full:
 		return fullMatcher(pattern), nil

common/matcher/str/strmatcher_test.go

@@ -0,0 +1,262 @@
+package str_test
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/xtls/xray-core/common"
+	. "github.com/xtls/xray-core/common/matcher/str"
+)
+
+func TestMatcherGroup(t *testing.T) {
+	rules := []struct {
+		Type   Type
+		Domain string
+	}{
+		{
+			Type:   Regex,
+			Domain: "apis\\.us$",
+		},
+		{
+			Type:   Substr,
+			Domain: "apis",
+		},
+		{
+			Type:   Domain,
+			Domain: "googleapis.com",
+		},
+		{
+			Type:   Domain,
+			Domain: "com",
+		},
+		{
+			Type:   Full,
+			Domain: "www.baidu.com",
+		},
+		{
+			Type:   Substr,
+			Domain: "apis",
+		},
+		{
+			Type:   Domain,
+			Domain: "googleapis.com",
+		},
+		{
+			Type:   Full,
+			Domain: "fonts.googleapis.com",
+		},
+		{
+			Type:   Full,
+			Domain: "www.baidu.com",
+		},
+		{
+			Type:   Domain,
+			Domain: "example.com",
+		},
+	}
+	cases := []struct {
+		Input  string
+		Output []uint32
+	}{
+		{
+			Input:  "www.baidu.com",
+			Output: []uint32{5, 9, 4},
+		},
+		{
+			Input:  "fonts.googleapis.com",
+			Output: []uint32{8, 3, 7, 4, 2, 6},
+		},
+		{
+			Input:  "example.googleapis.com",
+			Output: []uint32{3, 7, 4, 2, 6},
+		},
+		{
+			Input:  "testapis.us",
+			Output: []uint32{1, 2, 6},
+		},
+		{
+			Input:  "example.com",
+			Output: []uint32{10, 4},
+		},
+	}
+	matcherGroup := &MatcherGroup{}
+	for _, rule := range rules {
+		matcher, err := rule.Type.New(rule.Domain)
+		common.Must(err)
+		matcherGroup.Add(matcher)
+	}
+	for _, test := range cases {
+		if m := matcherGroup.Match(test.Input); !reflect.DeepEqual(m, test.Output) {
+			t.Error("unexpected output: ", m, " for test case ", test)
+		}
+	}
+}
+
+func TestACAutomaton(t *testing.T) {
+	cases1 := []struct {
+		pattern string
+		mType   Type
+		input   string
+		output  bool
+	}{
+		{
+			pattern: "xtls.github.io",
+			mType:   Domain,
+			input:   "www.xtls.github.io",
+			output:  true,
+		},
+		{
+			pattern: "xtls.github.io",
+			mType:   Domain,
+			input:   "xtls.github.io",
+			output:  true,
+		},
+		{
+			pattern: "xtls.github.io",
+			mType:   Domain,
+			input:   "www.xtis.github.io",
+			output:  false,
+		},
+		{
+			pattern: "xtls.github.io",
+			mType:   Domain,
+			input:   "tls.github.io",
+			output:  false,
+		},
+		{
+			pattern: "xtls.github.io",
+			mType:   Domain,
+			input:   "xxtls.github.io",
+			output:  false,
+		},
+		{
+			pattern: "xtls.github.io",
+			mType:   Full,
+			input:   "xtls.github.io",
+			output:  true,
+		},
+		{
+			pattern: "xtls.github.io",
+			mType:   Full,
+			input:   "xxtls.github.io",
+			output:  false,
+		},
+	}
+	for _, test := range cases1 {
+		var ac = NewACAutomaton()
+		ac.Add(test.pattern, test.mType)
+		ac.Build()
+		if m := ac.Match(test.input); m != test.output {
+			t.Error("unexpected output: ", m, " for test case ", test)
+		}
+	}
+	{
+		cases2Input := []struct {
+			pattern string
+			mType   Type
+		}{
+			{
+				pattern: "163.com",
+				mType:   Domain,
+			},
+			{
+				pattern: "m.126.com",
+				mType:   Full,
+			},
+			{
+				pattern: "3.com",
+				mType:   Full,
+			},
+			{
+				pattern: "google.com",
+				mType:   Substr,
+			},
+			{
+				pattern: "vgoogle.com",
+				mType:   Substr,
+			},
+		}
+		var ac = NewACAutomaton()
+		for _, test := range cases2Input {
+			ac.Add(test.pattern, test.mType)
+		}
+		ac.Build()
+		cases2Output := []struct {
+			pattern string
+			res     bool
+		}{
+			{
+				pattern: "126.com",
+				res:     false,
+			},
+			{
+				pattern: "m.163.com",
+				res:     true,
+			},
+			{
+				pattern: "mm163.com",
+				res:     false,
+			},
+			{
+				pattern: "m.126.com",
+				res:     true,
+			},
+			{
+				pattern: "163.com",
+				res:     true,
+			},
+			{
+				pattern: "63.com",
+				res:     false,
+			},
+			{
+				pattern: "oogle.com",
+				res:     false,
+			},
+			{
+				pattern: "vvgoogle.com",
+				res:     true,
+			},
+		}
+		for _, test := range cases2Output {
+			if m := ac.Match(test.pattern); m != test.res {
+				t.Error("unexpected output: ", m, " for test case ", test)
+			}
+		}
+	}
+
+	{
+		cases3Input := []struct {
+			pattern string
+			mType   Type
+		}{
+			{
+				pattern: "video.google.com",
+				mType:   Domain,
+			},
+			{
+				pattern: "gle.com",
+				mType:   Domain,
+			},
+		}
+		var ac = NewACAutomaton()
+		for _, test := range cases3Input {
+			ac.Add(test.pattern, test.mType)
+		}
+		ac.Build()
+		cases3Output := []struct {
+			pattern string
+			res     bool
+		}{
+			{
+				pattern: "google.com",
+				res:     false,
+			},
+		}
+		for _, test := range cases3Output {
+			if m := ac.Match(test.pattern); m != test.res {
+				t.Error("unexpected output: ", m, " for test case ", test)
+			}
+		}
+	}
+}

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)
 }