Update 1.8.9 and dependencies

Bumps [github.com/sagernet/sing](https://github.com/sagernet/sing) from 0.3.5 to 0.3.6.
- [Commits](https://github.com/sagernet/sing/compare/v0.3.5...v0.3.6)

---
updated-dependencies:
- dependency-name: github.com/sagernet/sing
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/build/friendly-filenames.json

@@ -2,7 +2,6 @@
   "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" },

.github/workflows/docker.yml

@@ -11,10 +11,10 @@ jobs:
     permissions:
       packages: write
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - name: Docker metadata
         id: meta
-        uses: docker/metadata-action@v4
+        uses: docker/metadata-action@v5
         with:
           images: ghcr.io/${{ github.repository_owner }}/xray-core
           flavor: latest=true
@@ -23,7 +23,7 @@ jobs:
             type=ref,event=pr
             type=semver,pattern={{version}}
       - name: Login to GitHub Container Registry
-        uses: docker/login-action@v2
+        uses: docker/login-action@v3
         with:
           registry: ghcr.io
           username: ${{ github.repository_owner }}
@@ -31,11 +31,11 @@ jobs:
       - # Add support for more platforms with QEMU (optional)
         # https://github.com/docker/setup-qemu-action
         name: Set up QEMU
-        uses: docker/setup-qemu-action@v2
+        uses: docker/setup-qemu-action@v3
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
       - name: Build and push
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v5
         with:
           context: .
           platforms: linux/amd64,linux/arm64

.github/workflows/release.yml

@@ -24,14 +24,14 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Restore Cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: resources
           key: xray-geodat-
 
       - name: Update Geodat
         id: update
-        uses: nick-fields/retry@v2
+        uses: nick-fields/retry@v3
         with:
           timeout_minutes: 60
           retry_wait_seconds: 60
@@ -57,7 +57,7 @@ jobs:
             done
 
       - name: Save Cache
-        uses: actions/cache/save@v3
+        uses: actions/cache/save@v4
         if: ${{ steps.update.outputs.unhit }}
         with:
           path: resources
@@ -70,12 +70,10 @@ jobs:
     strategy:
       matrix:
         # Include amd64 on all platforms.
-        goos: [windows, freebsd, openbsd, linux, dragonfly, darwin]
+        goos: [windows, freebsd, openbsd, linux, darwin]
         goarch: [amd64, 386]
         exclude:
-          # Exclude i386 on darwin and dragonfly.
-          - goarch: 386
-            goos: dragonfly
+          # Exclude i386 on darwin
           - goarch: 386
             goos: darwin
         include:
@@ -158,7 +156,7 @@ jobs:
       CGO_ENABLED: 0
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Show workflow information 
         run: |
@@ -167,47 +165,22 @@ jobs:
           echo "ASSET_NAME=$_NAME" >> $GITHUB_ENV
 
       - name: Set up Go
-        uses: actions/setup-go@v4
+        uses: actions/setup-go@v5
         with:
-          go-version: '1.21'
+          go-version-file: go.mod
           check-latest: true
 
       - 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 background Xray on Windows 
-        if: matrix.goos == 'windows'
-        run: |
-          go build -v -o build_assets/wxray.exe -trimpath -ldflags "-s -w -H windowsgui -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
+          make
+          find . -maxdepth 1 -type f -regex '.*\(wxray\|xray\|xray_softfloat\)\(\|.exe\)' -exec mv {} ./build_assets/ \;
 
       - name: Restore Cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: resources
           key: xray-geodat-
@@ -237,7 +210,7 @@ jobs:
           mv build_assets Xray-${{ env.ASSET_NAME }}
 
       - name: Upload files to Artifacts
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: Xray-${{ env.ASSET_NAME }}
           path: |

.github/workflows/test.yml

@@ -27,15 +27,15 @@ jobs:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
     steps:
-      - name: Set up Go
-        uses: actions/setup-go@v4
-        with:
-          go-version: '1.21'
-          check-latest: true
       - name: Checkout codebase
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
+      - name: Set up Go
+        uses: actions/setup-go@v5
+        with:
+          go-version-file: go.mod
+          check-latest: true
       - name: Restore Cache
-        uses: actions/cache/restore@v3
+        uses: actions/cache/restore@v4
         with:
           path: resources
           key: xray-geodat-

.gitignore

@@ -19,6 +19,7 @@
 *.zip
 *.tar.gz
 xray
+xray_softfloat
 mockgen
 vprotogen
 !infra/vprotogen/
@@ -26,3 +27,4 @@ errorgen
 !common/errors/errorgen/
 *.dat
 .vscode
+/build_assets

Makefile

@@ -0,0 +1,29 @@
+NAME = xray
+
+VERSION=$(shell git describe --always --dirty)
+
+LDFLAGS = -X github.com/xtls/xray-core/core.build=$(VERSION) -s -w -buildid=
+PARAMS = -trimpath -ldflags "$(LDFLAGS)" -v
+MAIN = ./main
+PREFIX ?= $(shell go env GOPATH)
+ifeq ($(GOOS),windows)
+OUTPUT = $(NAME).exe
+ADDITION = go build -o w$(NAME).exe -trimpath -ldflags "-H windowsgui $(LDFLAGS)" -v $(MAIN)
+else
+OUTPUT = $(NAME)
+endif
+ifeq ($(shell echo "$(GOARCH)" | grep -Pq "(mips|mipsle)" && echo true),true) # 
+ADDITION = GOMIPS=softfloat go build -o $(NAME)_softfloat -trimpath -ldflags "$(LDFLAGS)" -v $(MAIN)
+endif
+.PHONY: clean
+
+build:
+	go build -o $(OUTPUT) $(PARAMS) $(MAIN)
+	$(ADDITION)
+
+install:
+	go build -o $(PREFIX)/bin/$(OUTPUT) $(PARAMS) $(MAIN)
+
+clean:
+	go clean -v -i $(PWD)
+	rm -f xray xray.exe wxray.exe xray_softfloat

README.md

@@ -22,18 +22,20 @@
 
 - Linux Script
   - [XTLS/Xray-install](https://github.com/XTLS/Xray-install)
+  - [team-cloudchaser/tempest](https://github.com/team-cloudchaser/tempest) (supports [`systemd`](https://systemd.io) and [OpenRC](https://github.com/OpenRC/openrc); Linux-only)
 - Docker
+  - Official: [ghcr.io/xtls/xray-core](https://ghcr.io/xtls/xray-core) 
   - [iamybj/docker-xray](https://hub.docker.com/r/iamybj/docker-xray)
   - [teddysun/xray](https://hub.docker.com/r/teddysun/xray)
 - Web Panel
-  - [X-UI](https://github.com/FranzKafkaYu/x-ui), [X-UI-English](https://github.com/NidukaAkalanka/x-ui-english), [3X-UI](https://github.com/MHSanaei/3x-ui), [X-UI](https://github.com/alireza0/x-ui), [X-UI](https://github.com/diditra/x-ui)
+  - [X-UI-English](https://github.com/NidukaAkalanka/x-ui-english), [3X-UI](https://github.com/MHSanaei/3x-ui), [X-UI](https://github.com/alireza0/x-ui), [X-UI](https://github.com/diditra/x-ui)
   - [Xray-UI](https://github.com/qist/xray-ui), [X-UI](https://github.com/sing-web/x-ui)
   - [Hiddify](https://github.com/hiddify/hiddify-config)
   - [Marzban](https://github.com/Gozargah/Marzban)
   - [Libertea](https://github.com/VZiChoushaDui/Libertea)
 - One Click
   - [Xray-REALITY](https://github.com/zxcvos/Xray-script), [xray-reality](https://github.com/sajjaddg/xray-reality), [reality-ezpz](https://github.com/aleskxyz/reality-ezpz)
-  - [Xray-script](https://github.com/kirin10000/Xray-script), [Xray_bash_onekey](https://github.com/hello-yunshu/Xray_bash_onekey), [XTool](https://github.com/LordPenguin666/XTool)
+  - [Xray_bash_onekey](https://github.com/hello-yunshu/Xray_bash_onekey), [XTool](https://github.com/LordPenguin666/XTool)
   - [v2ray-agent](https://github.com/mack-a/v2ray-agent), [Xray_onekey](https://github.com/wulabing/Xray_onekey), [ProxySU](https://github.com/proxysu/ProxySU)
 - Magisk
   - [Xray4Magisk](https://github.com/Asterisk4Magisk/Xray4Magisk)
@@ -56,6 +58,7 @@
   - [REALITY (English)](https://cscot.pages.dev/2023/03/02/Xray-REALITY-tutorial/)
   - [XTLS-Iran-Reality (English)](https://github.com/SasukeFreestyle/XTLS-Iran-Reality)
   - [Xray REALITY with 'steal oneself' (English)](https://computerscot.github.io/vless-xtls-utls-reality-steal-oneself.html)
+  - [Xray with WireGuard inbound (English)](https://g800.pages.dev/wireguard)
 
 ## GUI Clients
 
@@ -76,6 +79,7 @@
 - iOS & macOS arm64
   - [Mango](https://github.com/arror/Mango)
   - [FoXray](https://apps.apple.com/app/foxray/id6448898396)
+  - [Streisand](https://apps.apple.com/app/streisand/id6450534064)
 - macOS arm64 & x64
   - [V2rayU](https://github.com/yanue/V2rayU)
   - [V2RayXS](https://github.com/tzmax/V2RayXS)
@@ -90,12 +94,15 @@
 
 - iOS & macOS arm64
   - [Shadowrocket](https://apps.apple.com/app/shadowrocket/id932747118)
+- Xray Tools
+  - [xray-knife](https://github.com/lilendian0x00/xray-knife)
 - Xray Wrapper
   - [XTLS/libXray](https://github.com/XTLS/libXray)
   - [xtlsapi](https://github.com/hiddify/xtlsapi)
   - [AndroidLibXrayLite](https://github.com/2dust/AndroidLibXrayLite)
   - [XrayKit](https://github.com/arror/XrayKit)
   - [Xray-core-python](https://github.com/LorenEteval/Xray-core-python)
+  - [xray-api](https://github.com/XVGuardian/xray-api)
 - [XrayR](https://github.com/XrayR-project/XrayR)
   - [XrayR-release](https://github.com/XrayR-project/XrayR-release)
   - [XrayR-V2Board](https://github.com/missuo/XrayR-V2Board)
@@ -120,16 +127,23 @@
 
 ## Compilation
 
-### Windows
+### Windows (PowerShell)
 
-```bash
+```powershell
+$env:CGO_ENABLED=0
 go build -o xray.exe -trimpath -ldflags "-s -w -buildid=" ./main
 ```
 
 ### Linux / macOS
 
 ```bash
-go build -o xray -trimpath -ldflags "-s -w -buildid=" ./main
+CGO_ENABLED=0 go build -o xray -trimpath -ldflags "-s -w -buildid=" ./main
+```
+
+### Reproducible Releases
+
+```bash
+make
 ```
 
 ## Stargazers over time

app/commander/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/commander/config.proto
 

app/dispatcher/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/dispatcher/config.proto
 

app/dispatcher/default.go

@@ -195,11 +195,11 @@ func (d *DefaultDispatcher) shouldOverride(ctx context.Context, result SniffResu
 		protocolString = resComp.ProtocolForDomainResult()
 	}
 	for _, p := range request.OverrideDestinationForProtocol {
-		if strings.HasPrefix(protocolString, p) || strings.HasPrefix(protocolString, p) {
+		if strings.HasPrefix(protocolString, p) || strings.HasPrefix(p, protocolString) {
 			return true
 		}
 		if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok && protocolString != "bittorrent" && p == "fakedns" &&
-			destination.Address.Family().IsIP() && fkr0.IsIPInIPPool(destination.Address) {
+			fkr0.IsIPInIPPool(destination.Address) {
 			newError("Using sniffer ", protocolString, " since the fake DNS missed").WriteToLog(session.ExportIDToError(ctx))
 			return true
 		}
@@ -218,16 +218,19 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
 	if !destination.IsValid() {
 		panic("Dispatcher: Invalid destination.")
 	}
-	ob := &session.Outbound{
-		OriginalTarget: destination,
-		Target:         destination,
+	ob := session.OutboundFromContext(ctx)
+	if ob == nil {
+		ob = &session.Outbound{}
+		ctx = session.ContextWithOutbound(ctx, ob)
 	}
-	ctx = session.ContextWithOutbound(ctx, ob)
+	ob.OriginalTarget = destination
+	ob.Target = destination
 	content := session.ContentFromContext(ctx)
 	if content == nil {
 		content = new(session.Content)
 		ctx = session.ContextWithContent(ctx, content)
 	}
+
 	sniffingRequest := content.SniffingRequest
 	inbound, outbound := d.getLink(ctx)
 	if !sniffingRequest.Enabled {
@@ -251,7 +254,7 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
 					protocol = resComp.ProtocolForDomainResult()
 				}
 				isFakeIP := false
-				if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok && ob.Target.Address.Family().IsIP() && fkr0.IsIPInIPPool(ob.Target.Address) {
+				if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok && fkr0.IsIPInIPPool(ob.Target.Address) {
 					isFakeIP = true
 				}
 				if sniffingRequest.RouteOnly && protocol != "fakedns" && protocol != "fakedns+others" && !isFakeIP {
@@ -271,11 +274,13 @@ func (d *DefaultDispatcher) DispatchLink(ctx context.Context, destination net.De
 	if !destination.IsValid() {
 		return newError("Dispatcher: Invalid destination.")
 	}
-	ob := &session.Outbound{
-		OriginalTarget: destination,
-		Target:         destination,
+	ob := session.OutboundFromContext(ctx)
+	if ob == nil {
+		ob = &session.Outbound{}
+		ctx = session.ContextWithOutbound(ctx, ob)
 	}
-	ctx = session.ContextWithOutbound(ctx, ob)
+	ob.OriginalTarget = destination
+	ob.Target = destination
 	content := session.ContentFromContext(ctx)
 	if content == nil {
 		content = new(session.Content)
@@ -302,7 +307,7 @@ func (d *DefaultDispatcher) DispatchLink(ctx context.Context, destination net.De
 				protocol = resComp.ProtocolForDomainResult()
 			}
 			isFakeIP := false
-			if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok && ob.Target.Address.Family().IsIP() && fkr0.IsIPInIPPool(ob.Target.Address) {
+			if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok && fkr0.IsIPInIPPool(ob.Target.Address) {
 				isFakeIP = true
 			}
 			if sniffingRequest.RouteOnly && protocol != "fakedns" && protocol != "fakedns+others" && !isFakeIP {
@@ -362,7 +367,6 @@ func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool, netw
 	}
 	return contentResult, contentErr
 }
-
 func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.Link, destination net.Destination) {
 	ob := session.OutboundFromContext(ctx)
 	if hosts, ok := d.dns.(dns.HostsLookup); ok && destination.Address.Family().IsDomain() {

app/dns/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/dns/config.proto
 
@@ -134,6 +134,7 @@ type NameServer struct {
 	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"`
+	QueryStrategy     QueryStrategy                `protobuf:"varint,7,opt,name=query_strategy,json=queryStrategy,proto3,enum=xray.app.dns.QueryStrategy" json:"query_strategy,omitempty"`
 }
 
 func (x *NameServer) Reset() {
@@ -210,6 +211,13 @@ func (x *NameServer) GetOriginalRules() []*NameServer_OriginalRule {
 	return nil
 }
 
+func (x *NameServer) GetQueryStrategy() QueryStrategy {
+	if x != nil {
+		return x.QueryStrategy
+	}
+	return QueryStrategy_USE_IP
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -538,7 +546,7 @@ var file_app_dns_config_proto_rawDesc = []byte{
 	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, 0xee, 0x03, 0x0a, 0x0a, 0x4e, 0x61, 0x6d, 0x65, 0x53, 0x65,
+	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x22, 0xb2, 0x04, 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,
@@ -559,77 +567,81 @@ var file_app_dns_config_proto_rawDesc = []byte{
 	0x65, 0x73, 0x18, 0x04, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x25, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e,
 	0x61, 0x70, 0x70, 0x2e, 0x64, 0x6e, 0x73, 0x2e, 0x4e, 0x61, 0x6d, 0x65, 0x53, 0x65, 0x72, 0x76,
 	0x65, 0x72, 0x2e, 0x4f, 0x72, 0x69, 0x67, 0x69, 0x6e, 0x61, 0x6c, 0x52, 0x75, 0x6c, 0x65, 0x52,
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-	0x0a, 0x0e, 0x50, 0x72, 0x69, 0x6f, 0x72, 0x69, 0x74, 0x79, 0x44, 0x6f, 0x6d, 0x61, 0x69, 0x6e,
-	0x12, 0x34, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0e, 0x32, 0x20,
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+	0x44, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x52, 0x05, 0x76, 0x61, 0x6c, 0x75, 0x65, 0x3a, 0x02, 0x38,
+	0x01, 0x1a, 0x92, 0x01, 0x0a, 0x0b, 0x48, 0x6f, 0x73, 0x74, 0x4d, 0x61, 0x70, 0x70, 0x69, 0x6e,
+	0x67, 0x12, 0x34, 0x0a, 0x04, 0x74, 0x79, 0x70, 0x65, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0e, 0x32,
+	0x20, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x64, 0x6e, 0x73, 0x2e, 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, 0x4a, 0x04, 0x08, 0x07, 0x10, 0x08, 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, 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, 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 (
@@ -664,19 +676,20 @@ var file_app_dns_config_proto_depIdxs = []int32{
 	4,  // 1: xray.app.dns.NameServer.prioritized_domain:type_name -> xray.app.dns.NameServer.PriorityDomain
 	9,  // 2: xray.app.dns.NameServer.geoip:type_name -> xray.app.router.GeoIP
 	5,  // 3: xray.app.dns.NameServer.original_rules:type_name -> xray.app.dns.NameServer.OriginalRule
-	8,  // 4: xray.app.dns.Config.NameServers:type_name -> xray.common.net.Endpoint
-	2,  // 5: xray.app.dns.Config.name_server:type_name -> xray.app.dns.NameServer
-	6,  // 6: xray.app.dns.Config.Hosts:type_name -> xray.app.dns.Config.HostsEntry
-	7,  // 7: xray.app.dns.Config.static_hosts:type_name -> xray.app.dns.Config.HostMapping
-	1,  // 8: xray.app.dns.Config.query_strategy:type_name -> xray.app.dns.QueryStrategy
-	0,  // 9: xray.app.dns.NameServer.PriorityDomain.type:type_name -> xray.app.dns.DomainMatchingType
-	10, // 10: xray.app.dns.Config.HostsEntry.value:type_name -> xray.common.net.IPOrDomain
-	0,  // 11: xray.app.dns.Config.HostMapping.type:type_name -> xray.app.dns.DomainMatchingType
-	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
+	1,  // 4: xray.app.dns.NameServer.query_strategy:type_name -> xray.app.dns.QueryStrategy
+	8,  // 5: xray.app.dns.Config.NameServers:type_name -> xray.common.net.Endpoint
+	2,  // 6: xray.app.dns.Config.name_server:type_name -> xray.app.dns.NameServer
+	6,  // 7: xray.app.dns.Config.Hosts:type_name -> xray.app.dns.Config.HostsEntry
+	7,  // 8: xray.app.dns.Config.static_hosts:type_name -> xray.app.dns.Config.HostMapping
+	1,  // 9: xray.app.dns.Config.query_strategy:type_name -> xray.app.dns.QueryStrategy
+	0,  // 10: xray.app.dns.NameServer.PriorityDomain.type:type_name -> xray.app.dns.DomainMatchingType
+	10, // 11: xray.app.dns.Config.HostsEntry.value:type_name -> xray.common.net.IPOrDomain
+	0,  // 12: xray.app.dns.Config.HostMapping.type:type_name -> xray.app.dns.DomainMatchingType
+	13, // [13:13] is the sub-list for method output_type
+	13, // [13:13] is the sub-list for method input_type
+	13, // [13:13] is the sub-list for extension type_name
+	13, // [13:13] is the sub-list for extension extendee
+	0,  // [0:13] is the sub-list for field type_name
 }
 
 func init() { file_app_dns_config_proto_init() }

app/dns/config.proto

@@ -28,6 +28,7 @@ message NameServer {
   repeated PriorityDomain prioritized_domain = 2;
   repeated xray.app.router.GeoIP geoip = 3;
   repeated OriginalRule original_rules = 4;
+  QueryStrategy query_strategy = 7;
 }
 
 enum DomainMatchingType {

app/dns/dns.go

@@ -181,9 +181,7 @@ func (s *DNS) LookupIP(domain string, option dns.IPOption) ([]net.IP, error) {
 	}
 
 	// Normalize the FQDN form query
-	if strings.HasSuffix(domain, ".") {
-		domain = domain[:len(domain)-1]
-	}
+	domain = strings.TrimSuffix(domain, ".")
 
 	// Static host lookup
 	switch addrs := s.hosts.Lookup(domain, option); {
@@ -215,7 +213,8 @@ func (s *DNS) LookupIP(domain string, option dns.IPOption) ([]net.IP, error) {
 			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 && err != dns.ErrEmptyResponse {
+		// 5 for RcodeRefused in miekg/dns, hardcode to reduce binary size
+		if err != context.Canceled && err != context.DeadlineExceeded && err != errExpectedIPNonMatch && err != dns.ErrEmptyResponse && dns.RCodeFromError(err) != 5 {
 			return nil, err
 		}
 	}

app/dns/fakedns/fakedns.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/dns/fakedns/fakedns.proto
 

app/dns/nameserver.go

@@ -35,7 +35,7 @@ type Client struct {
 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) {
+func NewServer(dest net.Destination, dispatcher routing.Dispatcher, queryStrategy QueryStrategy) (Server, error) {
 	if address := dest.Address; address.Family().IsDomain() {
 		u, err := url.Parse(address.Domain())
 		if err != nil {
@@ -45,15 +45,15 @@ func NewServer(dest net.Destination, dispatcher routing.Dispatcher) (Server, err
 		case strings.EqualFold(u.String(), "localhost"):
 			return NewLocalNameServer(), nil
 		case strings.EqualFold(u.Scheme, "https"): // DOH Remote mode
-			return NewDoHNameServer(u, dispatcher)
+			return NewDoHNameServer(u, dispatcher, queryStrategy)
 		case strings.EqualFold(u.Scheme, "https+local"): // DOH Local mode
-			return NewDoHLocalNameServer(u), nil
+			return NewDoHLocalNameServer(u, queryStrategy), nil
 		case strings.EqualFold(u.Scheme, "quic+local"): // DNS-over-QUIC Local mode
-			return NewQUICNameServer(u)
+			return NewQUICNameServer(u, queryStrategy)
 		case strings.EqualFold(u.Scheme, "tcp"): // DNS-over-TCP Remote mode
-			return NewTCPNameServer(u, dispatcher)
+			return NewTCPNameServer(u, dispatcher, queryStrategy)
 		case strings.EqualFold(u.Scheme, "tcp+local"): // DNS-over-TCP Local mode
-			return NewTCPLocalNameServer(u)
+			return NewTCPLocalNameServer(u, queryStrategy)
 		case strings.EqualFold(u.String(), "fakedns"):
 			return NewFakeDNSServer(), nil
 		}
@@ -68,12 +68,19 @@ func NewServer(dest net.Destination, dispatcher routing.Dispatcher) (Server, err
 }
 
 // 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 router.GeoIPMatcherContainer, matcherInfos *[]*DomainMatcherInfo, updateDomainRule func(strmatcher.Matcher, int, []*DomainMatcherInfo) error) (*Client, error) {
+func NewClient(
+	ctx context.Context,
+	ns *NameServer,
+	clientIP net.IP,
+	container router.GeoIPMatcherContainer,
+	matcherInfos *[]*DomainMatcherInfo,
+	updateDomainRule func(strmatcher.Matcher, int, []*DomainMatcherInfo) error,
+) (*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)
+		server, err := NewServer(ns.Address.AsDestination(), dispatcher, ns.GetQueryStrategy())
 		if err != nil {
 			return newError("failed to create nameserver").Base(err).AtWarning()
 		}
@@ -160,7 +167,7 @@ func NewClient(ctx context.Context, ns *NameServer, clientIP net.IP, container r
 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)
+		server, err := NewServer(endpoint.AsDestination(), dispatcher, QueryStrategy_USE_IP)
 		if err != nil {
 			return newError("failed to create nameserver").Base(err).AtWarning()
 		}
@@ -218,3 +225,24 @@ func (c *Client) MatchExpectedIPs(domain string, ips []net.IP) ([]net.IP, error)
 	newError("domain ", domain, " expectIPs ", newIps, " matched at server ", c.Name()).AtDebug().WriteToLog()
 	return newIps, nil
 }
+
+func ResolveIpOptionOverride(queryStrategy QueryStrategy, ipOption dns.IPOption) dns.IPOption {
+	switch queryStrategy {
+	case QueryStrategy_USE_IP:
+		return ipOption
+	case QueryStrategy_USE_IP4:
+		return dns.IPOption{
+			IPv4Enable: ipOption.IPv4Enable,
+			IPv6Enable: false,
+			FakeEnable: false,
+		}
+	case QueryStrategy_USE_IP6:
+		return dns.IPOption{
+			IPv4Enable: false,
+			IPv6Enable: ipOption.IPv6Enable,
+			FakeEnable: false,
+		}
+	default:
+		return ipOption
+	}
+}

app/dns/nameserver_doh.go

@@ -31,19 +31,20 @@ import (
 type DoHNameServer struct {
 	dispatcher routing.Dispatcher
 	sync.RWMutex
-	ips        map[string]*record
-	pub        *pubsub.Service
-	cleanup    *task.Periodic
-	reqID      uint32
-	httpClient *http.Client
-	dohURL     string
-	name       string
+	ips           map[string]*record
+	pub           *pubsub.Service
+	cleanup       *task.Periodic
+	reqID         uint32
+	httpClient    *http.Client
+	dohURL        string
+	name          string
+	queryStrategy QueryStrategy
 }
 
 // NewDoHNameServer creates DOH server object for remote resolving.
-func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher) (*DoHNameServer, error) {
+func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher, queryStrategy QueryStrategy) (*DoHNameServer, error) {
 	newError("DNS: created Remote DOH client for ", url.String()).AtInfo().WriteToLog()
-	s := baseDOHNameServer(url, "DOH")
+	s := baseDOHNameServer(url, "DOH", queryStrategy)
 
 	s.dispatcher = dispatcher
 	tr := &http.Transport{
@@ -90,9 +91,9 @@ func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher) (*DoHNameServ
 }
 
 // NewDoHLocalNameServer creates DOH client object for local resolving
-func NewDoHLocalNameServer(url *url.URL) *DoHNameServer {
+func NewDoHLocalNameServer(url *url.URL, queryStrategy QueryStrategy) *DoHNameServer {
 	url.Scheme = "https"
-	s := baseDOHNameServer(url, "DOHL")
+	s := baseDOHNameServer(url, "DOHL", queryStrategy)
 	tr := &http.Transport{
 		IdleConnTimeout:   90 * time.Second,
 		ForceAttemptHTTP2: true,
@@ -122,12 +123,13 @@ func NewDoHLocalNameServer(url *url.URL) *DoHNameServer {
 	return s
 }
 
-func baseDOHNameServer(url *url.URL, prefix string) *DoHNameServer {
+func baseDOHNameServer(url *url.URL, prefix string, queryStrategy QueryStrategy) *DoHNameServer {
 	s := &DoHNameServer{
-		ips:    make(map[string]*record),
-		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(),
+		queryStrategy: queryStrategy,
 	}
 	s.cleanup = &task.Periodic{
 		Interval: time.Minute,
@@ -353,6 +355,10 @@ func (s *DoHNameServer) findIPsForDomain(domain string, option dns_feature.IPOpt
 // QueryIP implements Server.
 func (s *DoHNameServer) QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption, disableCache bool) ([]net.IP, error) { // nolint: dupl
 	fqdn := Fqdn(domain)
+	option = ResolveIpOptionOverride(s.queryStrategy, option)
+	if !option.IPv4Enable && !option.IPv6Enable {
+		return nil, dns_feature.ErrEmptyResponse
+	}
 
 	if disableCache {
 		newError("DNS cache is disabled. Querying IP for ", domain, " at ", s.name).AtDebug().WriteToLog()

app/dns/nameserver_doh_test.go

@@ -17,7 +17,7 @@ func TestDOHNameServer(t *testing.T) {
 	url, err := url.Parse("https+local://1.1.1.1/dns-query")
 	common.Must(err)
 
-	s := NewDoHLocalNameServer(url)
+	s := NewDoHLocalNameServer(url, QueryStrategy_USE_IP)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
 		IPv4Enable: true,
@@ -34,7 +34,7 @@ func TestDOHNameServerWithCache(t *testing.T) {
 	url, err := url.Parse("https+local://1.1.1.1/dns-query")
 	common.Must(err)
 
-	s := NewDoHLocalNameServer(url)
+	s := NewDoHLocalNameServer(url, QueryStrategy_USE_IP)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*5)
 	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns_feature.IPOption{
 		IPv4Enable: true,
@@ -57,3 +57,49 @@ func TestDOHNameServerWithCache(t *testing.T) {
 		t.Fatal(r)
 	}
 }
+
+func TestDOHNameServerWithIPv4Override(t *testing.T) {
+	url, err := url.Parse("https+local://1.1.1.1/dns-query")
+	common.Must(err)
+
+	s := NewDoHLocalNameServer(url, QueryStrategy_USE_IP4)
+	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,
+	}, false)
+	cancel()
+	common.Must(err)
+	if len(ips) == 0 {
+		t.Error("expect some ips, but got 0")
+	}
+
+	for _, ip := range ips {
+		if len(ip) != net.IPv4len {
+			t.Error("expect only IPv4 response from DNS query")
+		}
+	}
+}
+
+func TestDOHNameServerWithIPv6Override(t *testing.T) {
+	url, err := url.Parse("https+local://1.1.1.1/dns-query")
+	common.Must(err)
+
+	s := NewDoHLocalNameServer(url, QueryStrategy_USE_IP6)
+	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,
+	}, false)
+	cancel()
+	common.Must(err)
+	if len(ips) == 0 {
+		t.Error("expect some ips, but got 0")
+	}
+
+	for _, ip := range ips {
+		if len(ip) != net.IPv6len {
+			t.Error("expect only IPv6 response from DNS query")
+		}
+	}
+}

app/dns/nameserver_quic.go

@@ -1,7 +1,9 @@
 package dns
 
 import (
+	"bytes"
 	"context"
+	"encoding/binary"
 	"net/url"
 	"sync"
 	"sync/atomic"
@@ -24,24 +26,25 @@ import (
 
 // NextProtoDQ - During connection establishment, DNS/QUIC support is indicated
 // by selecting the ALPN token "dq" in the crypto handshake.
-const NextProtoDQ = "doq-i00"
+const NextProtoDQ = "doq"
 
 const handshakeTimeout = time.Second * 8
 
 // 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
-	connection  quic.Connection
+	ips           map[string]*record
+	pub           *pubsub.Service
+	cleanup       *task.Periodic
+	reqID         uint32
+	name          string
+	destination   *net.Destination
+	connection    quic.Connection
+	queryStrategy QueryStrategy
 }
 
 // NewQUICNameServer creates DNS-over-QUIC client object for local resolving
-func NewQUICNameServer(url *url.URL) (*QUICNameServer, error) {
+func NewQUICNameServer(url *url.URL, queryStrategy QueryStrategy) (*QUICNameServer, error) {
 	newError("DNS: created Local DNS-over-QUIC client for ", url.String()).AtInfo().WriteToLog()
 
 	var err error
@@ -55,10 +58,11 @@ func NewQUICNameServer(url *url.URL) (*QUICNameServer, error) {
 	dest := net.UDPDestination(net.ParseAddress(url.Hostname()), port)
 
 	s := &QUICNameServer{
-		ips:         make(map[string]*record),
-		pub:         pubsub.NewService(),
-		name:        url.String(),
-		destination: &dest,
+		ips:           make(map[string]*record),
+		pub:           pubsub.NewService(),
+		name:          url.String(),
+		destination:   &dest,
+		queryStrategy: queryStrategy,
 	}
 	s.cleanup = &task.Periodic{
 		Interval: time.Minute,
@@ -192,13 +196,18 @@ func (s *QUICNameServer) sendQuery(ctx context.Context, domain string, clientIP
 				return
 			}
 
+			dnsReqBuf := buf.New()
+			binary.Write(dnsReqBuf, binary.BigEndian, uint16(b.Len()))
+			dnsReqBuf.Write(b.Bytes())
+			b.Release()
+
 			conn, err := s.openStream(dnsCtx)
 			if err != nil {
 				newError("failed to open quic connection").Base(err).AtError().WriteToLog()
 				return
 			}
 
-			_, err = conn.Write(b.Bytes())
+			_, err = conn.Write(dnsReqBuf.Bytes())
 			if err != nil {
 				newError("failed to send query").Base(err).AtError().WriteToLog()
 				return
@@ -208,9 +217,21 @@ func (s *QUICNameServer) sendQuery(ctx context.Context, domain string, clientIP
 
 			respBuf := buf.New()
 			defer respBuf.Release()
-			n, err := respBuf.ReadFrom(conn)
+			n, err := respBuf.ReadFullFrom(conn, 2)
 			if err != nil && n == 0 {
-				newError("failed to read response").Base(err).AtError().WriteToLog()
+				newError("failed to read response length").Base(err).AtError().WriteToLog()
+				return
+			}
+			var length int16
+			err = binary.Read(bytes.NewReader(respBuf.Bytes()), binary.BigEndian, &length)
+			if err != nil {
+				newError("failed to parse response length").Base(err).AtError().WriteToLog()
+				return
+			}
+			respBuf.Clear()
+			n, err = respBuf.ReadFullFrom(conn, int32(length))
+			if err != nil && n == 0 {
+				newError("failed to read response length").Base(err).AtError().WriteToLog()
 				return
 			}
 
@@ -269,6 +290,10 @@ func (s *QUICNameServer) findIPsForDomain(domain string, option dns_feature.IPOp
 // QueryIP is called from dns.Server->queryIPTimeout
 func (s *QUICNameServer) QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption, disableCache bool) ([]net.IP, error) {
 	fqdn := Fqdn(domain)
+	option = ResolveIpOptionOverride(s.queryStrategy, option)
+	if !option.IPv4Enable && !option.IPv6Enable {
+		return nil, dns_feature.ErrEmptyResponse
+	}
 
 	if disableCache {
 		newError("DNS cache is disabled. Querying IP for ", domain, " at ", s.name).AtDebug().WriteToLog()

app/dns/nameserver_quic_test.go

@@ -16,7 +16,7 @@ import (
 func TestQUICNameServer(t *testing.T) {
 	url, err := url.Parse("quic://dns.adguard.com")
 	common.Must(err)
-	s, err := NewQUICNameServer(url)
+	s, err := NewQUICNameServer(url, QueryStrategy_USE_IP)
 	common.Must(err)
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
 	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns.IPOption{
@@ -40,3 +40,49 @@ func TestQUICNameServer(t *testing.T) {
 		t.Fatal(r)
 	}
 }
+
+func TestQUICNameServerWithIPv4Override(t *testing.T) {
+	url, err := url.Parse("quic://dns.adguard.com")
+	common.Must(err)
+	s, err := NewQUICNameServer(url, QueryStrategy_USE_IP4)
+	common.Must(err)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
+	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+	}, false)
+	cancel()
+	common.Must(err)
+	if len(ips) == 0 {
+		t.Error("expect some ips, but got 0")
+	}
+
+	for _, ip := range ips {
+		if len(ip) != net.IPv4len {
+			t.Error("expect only IPv4 response from DNS query")
+		}
+	}
+}
+
+func TestQUICNameServerWithIPv6Override(t *testing.T) {
+	url, err := url.Parse("quic://dns.adguard.com")
+	common.Must(err)
+	s, err := NewQUICNameServer(url, QueryStrategy_USE_IP6)
+	common.Must(err)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*2)
+	ips, err := s.QueryIP(ctx, "google.com", net.IP(nil), dns.IPOption{
+		IPv4Enable: true,
+		IPv6Enable: true,
+	}, false)
+	cancel()
+	common.Must(err)
+	if len(ips) == 0 {
+		t.Error("expect some ips, but got 0")
+	}
+
+	for _, ip := range ips {
+		if len(ip) != net.IPv6len {
+			t.Error("expect only IPv6 response from DNS query")
+		}
+	}
+}

app/dns/nameserver_tcp.go

@@ -27,18 +27,23 @@ import (
 // TCPNameServer implemented DNS over TCP (RFC7766).
 type TCPNameServer struct {
 	sync.RWMutex
-	name        string
-	destination *net.Destination
-	ips         map[string]*record
-	pub         *pubsub.Service
-	cleanup     *task.Periodic
-	reqID       uint32
-	dial        func(context.Context) (net.Conn, error)
+	name          string
+	destination   *net.Destination
+	ips           map[string]*record
+	pub           *pubsub.Service
+	cleanup       *task.Periodic
+	reqID         uint32
+	dial          func(context.Context) (net.Conn, error)
+	queryStrategy QueryStrategy
 }
 
 // NewTCPNameServer creates DNS over TCP server object for remote resolving.
-func NewTCPNameServer(url *url.URL, dispatcher routing.Dispatcher) (*TCPNameServer, error) {
-	s, err := baseTCPNameServer(url, "TCP")
+func NewTCPNameServer(
+	url *url.URL,
+	dispatcher routing.Dispatcher,
+	queryStrategy QueryStrategy,
+) (*TCPNameServer, error) {
+	s, err := baseTCPNameServer(url, "TCP", queryStrategy)
 	if err != nil {
 		return nil, err
 	}
@@ -59,8 +64,8 @@ func NewTCPNameServer(url *url.URL, dispatcher routing.Dispatcher) (*TCPNameServ
 }
 
 // NewTCPLocalNameServer creates DNS over TCP client object for local resolving
-func NewTCPLocalNameServer(url *url.URL) (*TCPNameServer, error) {
-	s, err := baseTCPNameServer(url, "TCPL")
+func NewTCPLocalNameServer(url *url.URL, queryStrategy QueryStrategy) (*TCPNameServer, error) {
+	s, err := baseTCPNameServer(url, "TCPL", queryStrategy)
 	if err != nil {
 		return nil, err
 	}
@@ -72,22 +77,22 @@ func NewTCPLocalNameServer(url *url.URL) (*TCPNameServer, error) {
 	return s, nil
 }
 
-func baseTCPNameServer(url *url.URL, prefix string) (*TCPNameServer, error) {
-	var err error
+func baseTCPNameServer(url *url.URL, prefix string, queryStrategy QueryStrategy) (*TCPNameServer, error) {
 	port := net.Port(53)
 	if url.Port() != "" {
-		port, err = net.PortFromString(url.Port())
-		if err != nil {
+		var err error
+		if port, err = net.PortFromString(url.Port()); err != nil {
 			return nil, err
 		}
 	}
 	dest := net.TCPDestination(net.ParseAddress(url.Hostname()), port)
 
 	s := &TCPNameServer{
-		destination: &dest,
-		ips:         make(map[string]*record),
-		pub:         pubsub.NewService(),
-		name:        prefix + "//" + dest.NetAddr(),
+		destination:   &dest,
+		ips:           make(map[string]*record),
+		pub:           pubsub.NewService(),
+		name:          prefix + "//" + dest.NetAddr(),
+		queryStrategy: queryStrategy,
 	}
 	s.cleanup = &task.Periodic{
 		Interval: time.Minute,
@@ -308,6 +313,10 @@ func (s *TCPNameServer) findIPsForDomain(domain string, option dns_feature.IPOpt
 // QueryIP implements Server.
 func (s *TCPNameServer) QueryIP(ctx context.Context, domain string, clientIP net.IP, option dns_feature.IPOption, disableCache bool) ([]net.IP, error) {
 	fqdn := Fqdn(domain)
+	option = ResolveIpOptionOverride(s.queryStrategy, option)
+	if !option.IPv4Enable && !option.IPv6Enable {
+		return nil, dns_feature.ErrEmptyResponse
+	}
 
 	if disableCache {
 		newError("DNS cache is disabled. Querying IP for ", domain, " at ", s.name).AtDebug().WriteToLog()

app/dns/nameserver_tcp_test.go

@@ -16,7 +16,7 @@ import (
 func TestTCPLocalNameServer(t *testing.T) {
 	url, err := url.Parse("tcp+local://8.8.8.8")
 	common.Must(err)
-	s, err := NewTCPLocalNameServer(url)
+	s, err := NewTCPLocalNameServer(url, QueryStrategy_USE_IP)
 	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{
@@ -33,7 +33,7 @@ func TestTCPLocalNameServer(t *testing.T) {
 func TestTCPLocalNameServerWithCache(t *testing.T) {
 	url, err := url.Parse("tcp+local://8.8.8.8")
 	common.Must(err)
-	s, err := NewTCPLocalNameServer(url)
+	s, err := NewTCPLocalNameServer(url, QueryStrategy_USE_IP)
 	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{
@@ -57,3 +57,51 @@ func TestTCPLocalNameServerWithCache(t *testing.T) {
 		t.Fatal(r)
 	}
 }
+
+func TestTCPLocalNameServerWithIPv4Override(t *testing.T) {
+	url, err := url.Parse("tcp+local://8.8.8.8")
+	common.Must(err)
+	s, err := NewTCPLocalNameServer(url, QueryStrategy_USE_IP4)
+	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,
+	}, false)
+	cancel()
+	common.Must(err)
+
+	if len(ips) == 0 {
+		t.Error("expect some ips, but got 0")
+	}
+
+	for _, ip := range ips {
+		if len(ip) != net.IPv4len {
+			t.Error("expect only IPv4 response from DNS query")
+		}
+	}
+}
+
+func TestTCPLocalNameServerWithIPv6Override(t *testing.T) {
+	url, err := url.Parse("tcp+local://8.8.8.8")
+	common.Must(err)
+	s, err := NewTCPLocalNameServer(url, QueryStrategy_USE_IP6)
+	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,
+	}, false)
+	cancel()
+	common.Must(err)
+
+	if len(ips) == 0 {
+		t.Error("expect some ips, but got 0")
+	}
+
+	for _, ip := range ips {
+		if len(ip) != net.IPv6len {
+			t.Error("expect only IPv6 response from DNS query")
+		}
+	}
+}

app/log/command/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/log/command/config.proto
 

app/log/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/log/config.proto
 

app/metrics/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/metrics/config.proto
 

app/observatory/burst/burst.go

@@ -0,0 +1,14 @@
+package burst
+
+import (
+	"math"
+	"time"
+)
+
+//go:generate go run github.com/v2fly/v2ray-core/v4/common/errors/errorgen
+
+const (
+	rttFailed = time.Duration(math.MaxInt64 - iota)
+	rttUntested
+	rttUnqualified
+)

app/observatory/burst/burstobserver.go

@@ -0,0 +1,108 @@
+package burst
+
+import (
+	"context"
+	
+	"github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/app/observatory"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/signal/done"
+	"github.com/xtls/xray-core/features/extension"
+	"github.com/xtls/xray-core/features/outbound"
+	"google.golang.org/protobuf/proto"
+	"sync"
+)
+
+type Observer struct {
+	config *Config
+	ctx    context.Context
+
+	statusLock sync.Mutex
+	hp         *HealthPing
+
+	finished *done.Instance
+
+	ohm outbound.Manager
+}
+
+func (o *Observer) GetObservation(ctx context.Context) (proto.Message, error) {
+	return &observatory.ObservationResult{Status: o.createResult()}, nil
+}
+
+func (o *Observer) createResult() []*observatory.OutboundStatus {
+	var result []*observatory.OutboundStatus
+	o.hp.access.Lock()
+	defer o.hp.access.Unlock()
+	for name, value := range o.hp.Results {
+		status := observatory.OutboundStatus{
+			Alive:           value.getStatistics().All != value.getStatistics().Fail,
+			Delay:           value.getStatistics().Average.Milliseconds(),
+			LastErrorReason: "",
+			OutboundTag:     name,
+			LastSeenTime:    0,
+			LastTryTime:     0,
+			HealthPing: &observatory.HealthPingMeasurementResult{
+				All:       int64(value.getStatistics().All),
+				Fail:      int64(value.getStatistics().Fail),
+				Deviation: int64(value.getStatistics().Deviation),
+				Average:   int64(value.getStatistics().Average),
+				Max:       int64(value.getStatistics().Max),
+				Min:       int64(value.getStatistics().Min),
+			},
+		}
+		result = append(result, &status)
+	}
+	return result
+}
+
+func (o *Observer) Type() interface{} {
+	return extension.ObservatoryType()
+}
+
+func (o *Observer) Start() error {
+	if o.config != nil && len(o.config.SubjectSelector) != 0 {
+		o.finished = done.New()
+		o.hp.StartScheduler(func() ([]string, error) {
+			hs, ok := o.ohm.(outbound.HandlerSelector)
+			if !ok {
+
+				return nil, newError("outbound.Manager is not a HandlerSelector")
+			}
+
+			outbounds := hs.Select(o.config.SubjectSelector)
+			return outbounds, nil
+		})
+	}
+	return nil
+}
+
+func (o *Observer) Close() error {
+	if o.finished != nil {
+		o.hp.StopScheduler()
+		return o.finished.Close()
+	}
+	return nil
+}
+
+func New(ctx context.Context, config *Config) (*Observer, error) {
+	var outboundManager outbound.Manager
+	err := core.RequireFeatures(ctx, func(om outbound.Manager) {
+		outboundManager = om
+	})
+	if err != nil {
+		return nil, newError("Cannot get depended features").Base(err)
+	}
+	hp := NewHealthPing(ctx, config.PingConfig)
+	return &Observer{
+		config: config,
+		ctx:    ctx,
+		ohm:    outboundManager,
+		hp:     hp,
+	}, nil
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
+		return New(ctx, config.(*Config))
+	}))
+}

app/observatory/burst/config.pb.go

@@ -0,0 +1,276 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.32.0
+// 	protoc        v4.23.1
+// source: app/observatory/burst/config.proto
+
+package burst
+
+import (
+	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)
+)
+
+type Config struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// @Document The selectors for outbound under observation
+	SubjectSelector []string          `protobuf:"bytes,2,rep,name=subject_selector,json=subjectSelector,proto3" json:"subject_selector,omitempty"`
+	PingConfig      *HealthPingConfig `protobuf:"bytes,3,opt,name=ping_config,json=pingConfig,proto3" json:"ping_config,omitempty"`
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_observatory_burst_config_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Config) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Config) ProtoMessage() {}
+
+func (x *Config) ProtoReflect() protoreflect.Message {
+	mi := &file_app_observatory_burst_config_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 Config.ProtoReflect.Descriptor instead.
+func (*Config) Descriptor() ([]byte, []int) {
+	return file_app_observatory_burst_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Config) GetSubjectSelector() []string {
+	if x != nil {
+		return x.SubjectSelector
+	}
+	return nil
+}
+
+func (x *Config) GetPingConfig() *HealthPingConfig {
+	if x != nil {
+		return x.PingConfig
+	}
+	return nil
+}
+
+type HealthPingConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// destination url, need 204 for success return
+	// default https://connectivitycheck.gstatic.com/generate_204
+	Destination string `protobuf:"bytes,1,opt,name=destination,proto3" json:"destination,omitempty"`
+	// connectivity check url
+	Connectivity string `protobuf:"bytes,2,opt,name=connectivity,proto3" json:"connectivity,omitempty"`
+	// health check interval, int64 values of time.Duration
+	Interval int64 `protobuf:"varint,3,opt,name=interval,proto3" json:"interval,omitempty"`
+	// sampling count is the amount of recent ping results which are kept for calculation
+	SamplingCount int32 `protobuf:"varint,4,opt,name=samplingCount,proto3" json:"samplingCount,omitempty"`
+	// ping timeout, int64 values of time.Duration
+	Timeout int64 `protobuf:"varint,5,opt,name=timeout,proto3" json:"timeout,omitempty"`
+}
+
+func (x *HealthPingConfig) Reset() {
+	*x = HealthPingConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_observatory_burst_config_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *HealthPingConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*HealthPingConfig) ProtoMessage() {}
+
+func (x *HealthPingConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_app_observatory_burst_config_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 HealthPingConfig.ProtoReflect.Descriptor instead.
+func (*HealthPingConfig) Descriptor() ([]byte, []int) {
+	return file_app_observatory_burst_config_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *HealthPingConfig) GetDestination() string {
+	if x != nil {
+		return x.Destination
+	}
+	return ""
+}
+
+func (x *HealthPingConfig) GetConnectivity() string {
+	if x != nil {
+		return x.Connectivity
+	}
+	return ""
+}
+
+func (x *HealthPingConfig) GetInterval() int64 {
+	if x != nil {
+		return x.Interval
+	}
+	return 0
+}
+
+func (x *HealthPingConfig) GetSamplingCount() int32 {
+	if x != nil {
+		return x.SamplingCount
+	}
+	return 0
+}
+
+func (x *HealthPingConfig) GetTimeout() int64 {
+	if x != nil {
+		return x.Timeout
+	}
+	return 0
+}
+
+var File_app_observatory_burst_config_proto protoreflect.FileDescriptor
+
+var file_app_observatory_burst_config_proto_rawDesc = []byte{
+	0x0a, 0x22, 0x61, 0x70, 0x70, 0x2f, 0x6f, 0x62, 0x73, 0x65, 0x72, 0x76, 0x61, 0x74, 0x6f, 0x72,
+	0x79, 0x2f, 0x62, 0x75, 0x72, 0x73, 0x74, 0x2f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2e, 0x70,
+	0x72, 0x6f, 0x74, 0x6f, 0x12, 0x1f, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e,
+	0x61, 0x70, 0x70, 0x2e, 0x6f, 0x62, 0x73, 0x65, 0x72, 0x76, 0x61, 0x74, 0x6f, 0x72, 0x79, 0x2e,
+	0x62, 0x75, 0x72, 0x73, 0x74, 0x22, 0x87, 0x01, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67,
+	0x12, 0x29, 0x0a, 0x10, 0x73, 0x75, 0x62, 0x6a, 0x65, 0x63, 0x74, 0x5f, 0x73, 0x65, 0x6c, 0x65,
+	0x63, 0x74, 0x6f, 0x72, 0x18, 0x02, 0x20, 0x03, 0x28, 0x09, 0x52, 0x0f, 0x73, 0x75, 0x62, 0x6a,
+	0x65, 0x63, 0x74, 0x53, 0x65, 0x6c, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x12, 0x52, 0x0a, 0x0b, 0x70,
+	0x69, 0x6e, 0x67, 0x5f, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x18, 0x03, 0x20, 0x01, 0x28, 0x0b,
+	0x32, 0x31, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e, 0x61, 0x70, 0x70,
+	0x2e, 0x6f, 0x62, 0x73, 0x65, 0x72, 0x76, 0x61, 0x74, 0x6f, 0x72, 0x79, 0x2e, 0x62, 0x75, 0x72,
+	0x73, 0x74, 0x2e, 0x48, 0x65, 0x61, 0x6c, 0x74, 0x68, 0x50, 0x69, 0x6e, 0x67, 0x43, 0x6f, 0x6e,
+	0x66, 0x69, 0x67, 0x52, 0x0a, 0x70, 0x69, 0x6e, 0x67, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x22,
+	0xb4, 0x01, 0x0a, 0x10, 0x48, 0x65, 0x61, 0x6c, 0x74, 0x68, 0x50, 0x69, 0x6e, 0x67, 0x43, 0x6f,
+	0x6e, 0x66, 0x69, 0x67, 0x12, 0x20, 0x0a, 0x0b, 0x64, 0x65, 0x73, 0x74, 0x69, 0x6e, 0x61, 0x74,
+	0x69, 0x6f, 0x6e, 0x18, 0x01, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0b, 0x64, 0x65, 0x73, 0x74, 0x69,
+	0x6e, 0x61, 0x74, 0x69, 0x6f, 0x6e, 0x12, 0x22, 0x0a, 0x0c, 0x63, 0x6f, 0x6e, 0x6e, 0x65, 0x63,
+	0x74, 0x69, 0x76, 0x69, 0x74, 0x79, 0x18, 0x02, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0c, 0x63, 0x6f,
+	0x6e, 0x6e, 0x65, 0x63, 0x74, 0x69, 0x76, 0x69, 0x74, 0x79, 0x12, 0x1a, 0x0a, 0x08, 0x69, 0x6e,
+	0x74, 0x65, 0x72, 0x76, 0x61, 0x6c, 0x18, 0x03, 0x20, 0x01, 0x28, 0x03, 0x52, 0x08, 0x69, 0x6e,
+	0x74, 0x65, 0x72, 0x76, 0x61, 0x6c, 0x12, 0x24, 0x0a, 0x0d, 0x73, 0x61, 0x6d, 0x70, 0x6c, 0x69,
+	0x6e, 0x67, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x18, 0x04, 0x20, 0x01, 0x28, 0x05, 0x52, 0x0d, 0x73,
+	0x61, 0x6d, 0x70, 0x6c, 0x69, 0x6e, 0x67, 0x43, 0x6f, 0x75, 0x6e, 0x74, 0x12, 0x18, 0x0a, 0x07,
+	0x74, 0x69, 0x6d, 0x65, 0x6f, 0x75, 0x74, 0x18, 0x05, 0x20, 0x01, 0x28, 0x03, 0x52, 0x07, 0x74,
+	0x69, 0x6d, 0x65, 0x6f, 0x75, 0x74, 0x42, 0x70, 0x0a, 0x1e, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72,
+	0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x6f, 0x62, 0x73, 0x65, 0x72, 0x76, 0x61, 0x74, 0x6f,
+	0x72, 0x79, 0x2e, 0x62, 0x75, 0x72, 0x73, 0x74, 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, 0x61, 0x70, 0x70, 0x2f, 0x6f, 0x62, 0x73, 0x65, 0x72, 0x76,
+	0x61, 0x74, 0x6f, 0x72, 0x79, 0x2f, 0x62, 0x75, 0x72, 0x73, 0x74, 0xaa, 0x02, 0x1a, 0x58, 0x72,
+	0x61, 0x79, 0x2e, 0x41, 0x70, 0x70, 0x2e, 0x4f, 0x62, 0x73, 0x65, 0x72, 0x76, 0x61, 0x74, 0x6f,
+	0x72, 0x79, 0x2e, 0x42, 0x75, 0x72, 0x73, 0x74, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_app_observatory_burst_config_proto_rawDescOnce sync.Once
+	file_app_observatory_burst_config_proto_rawDescData = file_app_observatory_burst_config_proto_rawDesc
+)
+
+func file_app_observatory_burst_config_proto_rawDescGZIP() []byte {
+	file_app_observatory_burst_config_proto_rawDescOnce.Do(func() {
+		file_app_observatory_burst_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_app_observatory_burst_config_proto_rawDescData)
+	})
+	return file_app_observatory_burst_config_proto_rawDescData
+}
+
+var file_app_observatory_burst_config_proto_msgTypes = make([]protoimpl.MessageInfo, 2)
+var file_app_observatory_burst_config_proto_goTypes = []interface{}{
+	(*Config)(nil),           // 0: xray.core.app.observatory.burst.Config
+	(*HealthPingConfig)(nil), // 1: xray.core.app.observatory.burst.HealthPingConfig
+}
+var file_app_observatory_burst_config_proto_depIdxs = []int32{
+	1, // 0: xray.core.app.observatory.burst.Config.ping_config:type_name -> xray.core.app.observatory.burst.HealthPingConfig
+	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_app_observatory_burst_config_proto_init() }
+func file_app_observatory_burst_config_proto_init() {
+	if File_app_observatory_burst_config_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_app_observatory_burst_config_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Config); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_observatory_burst_config_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*HealthPingConfig); 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_observatory_burst_config_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   2,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_app_observatory_burst_config_proto_goTypes,
+		DependencyIndexes: file_app_observatory_burst_config_proto_depIdxs,
+		MessageInfos:      file_app_observatory_burst_config_proto_msgTypes,
+	}.Build()
+	File_app_observatory_burst_config_proto = out.File
+	file_app_observatory_burst_config_proto_rawDesc = nil
+	file_app_observatory_burst_config_proto_goTypes = nil
+	file_app_observatory_burst_config_proto_depIdxs = nil
+}

app/observatory/burst/config.proto

@@ -0,0 +1,29 @@
+syntax = "proto3";
+
+package xray.core.app.observatory.burst;
+option csharp_namespace = "Xray.App.Observatory.Burst";
+option go_package = "github.com/xtls/xray-core/app/observatory/burst";
+option java_package = "com.xray.app.observatory.burst";
+option java_multiple_files = true;
+
+message Config {
+  /* @Document The selectors for outbound under observation
+  */
+  repeated string subject_selector = 2;
+
+  HealthPingConfig ping_config = 3;
+}
+
+message HealthPingConfig {
+  // destination url, need 204 for success return
+  // default https://connectivitycheck.gstatic.com/generate_204
+  string destination = 1;
+  // connectivity check url
+  string connectivity = 2;
+  // health check interval, int64 values of time.Duration
+  int64 interval = 3;
+  // sampling count is the amount of recent ping results which are kept for calculation
+  int32 samplingCount = 4;
+  // ping timeout, int64 values of time.Duration
+  int64 timeout = 5;
+}

app/observatory/burst/errors.generated.go

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

app/observatory/burst/healthping.go

@@ -0,0 +1,253 @@
+package burst
+
+import (
+	"context"
+	"fmt"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/xtls/xray-core/common/dice"
+)
+
+// HealthPingSettings holds settings for health Checker
+type HealthPingSettings struct {
+	Destination   string        `json:"destination"`
+	Connectivity  string        `json:"connectivity"`
+	Interval      time.Duration `json:"interval"`
+	SamplingCount int           `json:"sampling"`
+	Timeout       time.Duration `json:"timeout"`
+}
+
+// HealthPing is the health checker for balancers
+type HealthPing struct {
+	ctx         context.Context
+	access      sync.Mutex
+	ticker      *time.Ticker
+	tickerClose chan struct{}
+
+	Settings *HealthPingSettings
+	Results  map[string]*HealthPingRTTS
+}
+
+// NewHealthPing creates a new HealthPing with settings
+func NewHealthPing(ctx context.Context, config *HealthPingConfig) *HealthPing {
+	settings := &HealthPingSettings{}
+	if config != nil {
+		settings = &HealthPingSettings{
+			Connectivity:  strings.TrimSpace(config.Connectivity),
+			Destination:   strings.TrimSpace(config.Destination),
+			Interval:      time.Duration(config.Interval),
+			SamplingCount: int(config.SamplingCount),
+			Timeout:       time.Duration(config.Timeout),
+		}
+	}
+	if settings.Destination == "" {
+		// Destination URL, need 204 for success return default to chromium
+		// https://github.com/chromium/chromium/blob/main/components/safety_check/url_constants.cc#L10
+		// https://chromium.googlesource.com/chromium/src/+/refs/heads/main/components/safety_check/url_constants.cc#10
+		settings.Destination = "https://connectivitycheck.gstatic.com/generate_204"
+	}
+	if settings.Interval == 0 {
+		settings.Interval = time.Duration(1) * time.Minute
+	} else if settings.Interval < 10 {
+		newError("health check interval is too small, 10s is applied").AtWarning().WriteToLog()
+		settings.Interval = time.Duration(10) * time.Second
+	}
+	if settings.SamplingCount <= 0 {
+		settings.SamplingCount = 10
+	}
+	if settings.Timeout <= 0 {
+		// results are saved after all health pings finish,
+		// a larger timeout could possibly makes checks run longer
+		settings.Timeout = time.Duration(5) * time.Second
+	}
+	return &HealthPing{
+		ctx:      ctx,
+		Settings: settings,
+		Results:  nil,
+	}
+}
+
+// StartScheduler implements the HealthChecker
+func (h *HealthPing) StartScheduler(selector func() ([]string, error)) {
+	if h.ticker != nil {
+		return
+	}
+	interval := h.Settings.Interval * time.Duration(h.Settings.SamplingCount)
+	ticker := time.NewTicker(interval)
+	tickerClose := make(chan struct{})
+	h.ticker = ticker
+	h.tickerClose = tickerClose
+	go func() {
+		tags, err := selector()
+		if err != nil {
+			newError("error select outbounds for initial health check: ", err).AtWarning().WriteToLog()
+			return
+		}
+		h.Check(tags)
+	}()
+
+	go func() {
+		for {
+			go func() {
+				tags, err := selector()
+				if err != nil {
+					newError("error select outbounds for scheduled health check: ", err).AtWarning().WriteToLog()
+					return
+				}
+				h.doCheck(tags, interval, h.Settings.SamplingCount)
+				h.Cleanup(tags)
+			}()
+			select {
+			case <-ticker.C:
+				continue
+			case <-tickerClose:
+				return
+			}
+		}
+	}()
+}
+
+// StopScheduler implements the HealthChecker
+func (h *HealthPing) StopScheduler() {
+	if h.ticker == nil {
+		return
+	}
+	h.ticker.Stop()
+	h.ticker = nil
+	close(h.tickerClose)
+	h.tickerClose = nil
+}
+
+// Check implements the HealthChecker
+func (h *HealthPing) Check(tags []string) error {
+	if len(tags) == 0 {
+		return nil
+	}
+	newError("perform one-time health check for tags ", tags).AtInfo().WriteToLog()
+	h.doCheck(tags, 0, 1)
+	return nil
+}
+
+type rtt struct {
+	handler string
+	value   time.Duration
+}
+
+// doCheck performs the 'rounds' amount checks in given 'duration'. You should make
+// sure all tags are valid for current balancer
+func (h *HealthPing) doCheck(tags []string, duration time.Duration, rounds int) {
+	count := len(tags) * rounds
+	if count == 0 {
+		return
+	}
+	ch := make(chan *rtt, count)
+
+	for _, tag := range tags {
+		handler := tag
+		client := newPingClient(
+			h.ctx,
+			h.Settings.Destination,
+			h.Settings.Timeout,
+			handler,
+		)
+		for i := 0; i < rounds; i++ {
+			delay := time.Duration(0)
+			if duration > 0 {
+				delay = time.Duration(dice.Roll(int(duration)))
+			}
+			time.AfterFunc(delay, func() {
+				newError("checking ", handler).AtDebug().WriteToLog()
+				delay, err := client.MeasureDelay()
+				if err == nil {
+					ch <- &rtt{
+						handler: handler,
+						value:   delay,
+					}
+					return
+				}
+				if !h.checkConnectivity() {
+					newError("network is down").AtWarning().WriteToLog()
+					ch <- &rtt{
+						handler: handler,
+						value:   0,
+					}
+					return
+				}
+				newError(fmt.Sprintf(
+					"error ping %s with %s: %s",
+					h.Settings.Destination,
+					handler,
+					err,
+				)).AtWarning().WriteToLog()
+				ch <- &rtt{
+					handler: handler,
+					value:   rttFailed,
+				}
+			})
+		}
+	}
+	for i := 0; i < count; i++ {
+		rtt := <-ch
+		if rtt.value > 0 {
+			// should not put results when network is down
+			h.PutResult(rtt.handler, rtt.value)
+		}
+	}
+}
+
+// PutResult put a ping rtt to results
+func (h *HealthPing) PutResult(tag string, rtt time.Duration) {
+	h.access.Lock()
+	defer h.access.Unlock()
+	if h.Results == nil {
+		h.Results = make(map[string]*HealthPingRTTS)
+	}
+	r, ok := h.Results[tag]
+	if !ok {
+		// validity is 2 times to sampling period, since the check are
+		// distributed in the time line randomly, in extreme cases,
+		// previous checks are distributed on the left, and latters
+		// on the right
+		validity := h.Settings.Interval * time.Duration(h.Settings.SamplingCount) * 2
+		r = NewHealthPingResult(h.Settings.SamplingCount, validity)
+		h.Results[tag] = r
+	}
+	r.Put(rtt)
+}
+
+// Cleanup removes results of removed handlers,
+// tags should be all valid tags of the Balancer now
+func (h *HealthPing) Cleanup(tags []string) {
+	h.access.Lock()
+	defer h.access.Unlock()
+	for tag := range h.Results {
+		found := false
+		for _, v := range tags {
+			if tag == v {
+				found = true
+				break
+			}
+		}
+		if !found {
+			delete(h.Results, tag)
+		}
+	}
+}
+
+// checkConnectivity checks the network connectivity, it returns
+// true if network is good or "connectivity check url" not set
+func (h *HealthPing) checkConnectivity() bool {
+	if h.Settings.Connectivity == "" {
+		return true
+	}
+	tester := newDirectPingClient(
+		h.Settings.Connectivity,
+		h.Settings.Timeout,
+	)
+	if _, err := tester.MeasureDelay(); err != nil {
+		return false
+	}
+	return true
+}

app/observatory/burst/healthping_result.go

@@ -0,0 +1,143 @@
+package burst
+
+import (
+	"math"
+	"time"
+)
+
+// HealthPingStats is the statistics of HealthPingRTTS
+type HealthPingStats struct {
+	All       int
+	Fail      int
+	Deviation time.Duration
+	Average   time.Duration
+	Max       time.Duration
+	Min       time.Duration
+}
+
+// HealthPingRTTS holds ping rtts for health Checker
+type HealthPingRTTS struct {
+	idx      int
+	cap      int
+	validity time.Duration
+	rtts     []*pingRTT
+
+	lastUpdateAt time.Time
+	stats        *HealthPingStats
+}
+
+type pingRTT struct {
+	time  time.Time
+	value time.Duration
+}
+
+// NewHealthPingResult returns a *HealthPingResult with specified capacity
+func NewHealthPingResult(cap int, validity time.Duration) *HealthPingRTTS {
+	return &HealthPingRTTS{cap: cap, validity: validity}
+}
+
+// Get gets statistics of the HealthPingRTTS
+func (h *HealthPingRTTS) Get() *HealthPingStats {
+	return h.getStatistics()
+}
+
+// GetWithCache get statistics and write cache for next call
+// Make sure use Mutex.Lock() before calling it, RWMutex.RLock()
+// is not an option since it writes cache
+func (h *HealthPingRTTS) GetWithCache() *HealthPingStats {
+	lastPutAt := h.rtts[h.idx].time
+	now := time.Now()
+	if h.stats == nil || h.lastUpdateAt.Before(lastPutAt) || h.findOutdated(now) >= 0 {
+		h.stats = h.getStatistics()
+		h.lastUpdateAt = now
+	}
+	return h.stats
+}
+
+// Put puts a new rtt to the HealthPingResult
+func (h *HealthPingRTTS) Put(d time.Duration) {
+	if h.rtts == nil {
+		h.rtts = make([]*pingRTT, h.cap)
+		for i := 0; i < h.cap; i++ {
+			h.rtts[i] = &pingRTT{}
+		}
+		h.idx = -1
+	}
+	h.idx = h.calcIndex(1)
+	now := time.Now()
+	h.rtts[h.idx].time = now
+	h.rtts[h.idx].value = d
+}
+
+func (h *HealthPingRTTS) calcIndex(step int) int {
+	idx := h.idx
+	idx += step
+	if idx >= h.cap {
+		idx %= h.cap
+	}
+	return idx
+}
+
+func (h *HealthPingRTTS) getStatistics() *HealthPingStats {
+	stats := &HealthPingStats{}
+	stats.Fail = 0
+	stats.Max = 0
+	stats.Min = rttFailed
+	sum := time.Duration(0)
+	cnt := 0
+	validRTTs := make([]time.Duration, 0)
+	for _, rtt := range h.rtts {
+		switch {
+		case rtt.value == 0 || time.Since(rtt.time) > h.validity:
+			continue
+		case rtt.value == rttFailed:
+			stats.Fail++
+			continue
+		}
+		cnt++
+		sum += rtt.value
+		validRTTs = append(validRTTs, rtt.value)
+		if stats.Max < rtt.value {
+			stats.Max = rtt.value
+		}
+		if stats.Min > rtt.value {
+			stats.Min = rtt.value
+		}
+	}
+	stats.All = cnt + stats.Fail
+	if cnt == 0 {
+		stats.Min = 0
+		return stats
+	}
+	stats.Average = time.Duration(int(sum) / cnt)
+	var std float64
+	if cnt < 2 {
+		// no enough data for standard deviation, we assume it's half of the average rtt
+		// if we don't do this, standard deviation of 1 round tested nodes is 0, will always
+		// selected before 2 or more rounds tested nodes
+		std = float64(stats.Average / 2)
+	} else {
+		variance := float64(0)
+		for _, rtt := range validRTTs {
+			variance += math.Pow(float64(rtt-stats.Average), 2)
+		}
+		std = math.Sqrt(variance / float64(cnt))
+	}
+	stats.Deviation = time.Duration(std)
+	return stats
+}
+
+func (h *HealthPingRTTS) findOutdated(now time.Time) int {
+	for i := h.cap - 1; i < 2*h.cap; i++ {
+		// from oldest to latest
+		idx := h.calcIndex(i)
+		validity := h.rtts[idx].time.Add(h.validity)
+		if h.lastUpdateAt.After(validity) {
+			return idx
+		}
+		if validity.Before(now) {
+			return idx
+		}
+	}
+	return -1
+}

app/observatory/burst/healthping_result_test.go

@@ -0,0 +1,106 @@
+package burst_test
+
+import (
+	"math"
+	reflect "reflect"
+	"testing"
+	"time"
+
+	"github.com/xtls/xray-core/app/observatory/burst"
+)
+
+func TestHealthPingResults(t *testing.T) {
+	rtts := []int64{60, 140, 60, 140, 60, 60, 140, 60, 140}
+	hr := burst.NewHealthPingResult(4, time.Hour)
+	for _, rtt := range rtts {
+		hr.Put(time.Duration(rtt))
+	}
+	rttFailed := time.Duration(math.MaxInt64)
+	expected := &burst.HealthPingStats{
+		All:       4,
+		Fail:      0,
+		Deviation: 40,
+		Average:   100,
+		Max:       140,
+		Min:       60,
+	}
+	actual := hr.Get()
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("expected: %v, actual: %v", expected, actual)
+	}
+	hr.Put(rttFailed)
+	hr.Put(rttFailed)
+	expected.Fail = 2
+	actual = hr.Get()
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("failed half-failures test, expected: %v, actual: %v", expected, actual)
+	}
+	hr.Put(rttFailed)
+	hr.Put(rttFailed)
+	expected = &burst.HealthPingStats{
+		All:       4,
+		Fail:      4,
+		Deviation: 0,
+		Average:   0,
+		Max:       0,
+		Min:       0,
+	}
+	actual = hr.Get()
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("failed all-failures test, expected: %v, actual: %v", expected, actual)
+	}
+}
+
+func TestHealthPingResultsIgnoreOutdated(t *testing.T) {
+	rtts := []int64{60, 140, 60, 140}
+	hr := burst.NewHealthPingResult(4, time.Duration(10)*time.Millisecond)
+	for i, rtt := range rtts {
+		if i == 2 {
+			// wait for previous 2 outdated
+			time.Sleep(time.Duration(10) * time.Millisecond)
+		}
+		hr.Put(time.Duration(rtt))
+	}
+	hr.Get()
+	expected := &burst.HealthPingStats{
+		All:       2,
+		Fail:      0,
+		Deviation: 40,
+		Average:   100,
+		Max:       140,
+		Min:       60,
+	}
+	actual := hr.Get()
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("failed 'half-outdated' test, expected: %v, actual: %v", expected, actual)
+	}
+	// wait for all outdated
+	time.Sleep(time.Duration(10) * time.Millisecond)
+	expected = &burst.HealthPingStats{
+		All:       0,
+		Fail:      0,
+		Deviation: 0,
+		Average:   0,
+		Max:       0,
+		Min:       0,
+	}
+	actual = hr.Get()
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("failed 'outdated / not-tested' test, expected: %v, actual: %v", expected, actual)
+	}
+
+	hr.Put(time.Duration(60))
+	expected = &burst.HealthPingStats{
+		All:  1,
+		Fail: 0,
+		// 1 sample, std=0.5rtt
+		Deviation: 30,
+		Average:   60,
+		Max:       60,
+		Min:       60,
+	}
+	actual = hr.Get()
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("expected: %v, actual: %v", expected, actual)
+	}
+}

app/observatory/burst/ping.go

@@ -0,0 +1,69 @@
+package burst
+
+import (
+	"context"
+	"net/http"
+	"time"
+
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/transport/internet/tagged"
+)
+
+type pingClient struct {
+	destination string
+	httpClient  *http.Client
+}
+
+func newPingClient(ctx context.Context, destination string, timeout time.Duration, handler string) *pingClient {
+	return &pingClient{
+		destination: destination,
+		httpClient:  newHTTPClient(ctx, handler, timeout),
+	}
+}
+
+func newDirectPingClient(destination string, timeout time.Duration) *pingClient {
+	return &pingClient{
+		destination: destination,
+		httpClient:  &http.Client{Timeout: timeout},
+	}
+}
+
+func newHTTPClient(ctxv context.Context, handler string, timeout time.Duration) *http.Client {
+	tr := &http.Transport{
+		DisableKeepAlives: true,
+		DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+			dest, err := net.ParseDestination(network + ":" + addr)
+			if err != nil {
+				return nil, err
+			}
+			return tagged.Dialer(ctxv, dest, handler)
+		},
+	}
+	return &http.Client{
+		Transport: tr,
+		Timeout:   timeout,
+		// don't follow redirect
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+	}
+}
+
+// MeasureDelay returns the delay time of the request to dest
+func (s *pingClient) MeasureDelay() (time.Duration, error) {
+	if s.httpClient == nil {
+		panic("pingClient no initialized")
+	}
+	req, err := http.NewRequest(http.MethodHead, s.destination, nil)
+	if err != nil {
+		return rttFailed, err
+	}
+	start := time.Now()
+	resp, err := s.httpClient.Do(req)
+	if err != nil {
+		return rttFailed, err
+	}
+	// don't wait for body
+	resp.Body.Close()
+	return time.Since(start), nil
+}

app/observatory/command/command.go

@@ -1,6 +1,3 @@
-//go:build !confonly
-// +build !confonly
-
 package command
 
 import (

app/observatory/command/command.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/observatory/command/command.proto
 

app/observatory/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/observatory/config.proto
 
@@ -67,6 +67,93 @@ func (x *ObservationResult) GetStatus() []*OutboundStatus {
 	return nil
 }
 
+type HealthPingMeasurementResult struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	All       int64 `protobuf:"varint,1,opt,name=all,proto3" json:"all,omitempty"`
+	Fail      int64 `protobuf:"varint,2,opt,name=fail,proto3" json:"fail,omitempty"`
+	Deviation int64 `protobuf:"varint,3,opt,name=deviation,proto3" json:"deviation,omitempty"`
+	Average   int64 `protobuf:"varint,4,opt,name=average,proto3" json:"average,omitempty"`
+	Max       int64 `protobuf:"varint,5,opt,name=max,proto3" json:"max,omitempty"`
+	Min       int64 `protobuf:"varint,6,opt,name=min,proto3" json:"min,omitempty"`
+}
+
+func (x *HealthPingMeasurementResult) Reset() {
+	*x = HealthPingMeasurementResult{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_observatory_config_proto_msgTypes[1]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *HealthPingMeasurementResult) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*HealthPingMeasurementResult) ProtoMessage() {}
+
+func (x *HealthPingMeasurementResult) ProtoReflect() protoreflect.Message {
+	mi := &file_app_observatory_config_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 HealthPingMeasurementResult.ProtoReflect.Descriptor instead.
+func (*HealthPingMeasurementResult) Descriptor() ([]byte, []int) {
+	return file_app_observatory_config_proto_rawDescGZIP(), []int{1}
+}
+
+func (x *HealthPingMeasurementResult) GetAll() int64 {
+	if x != nil {
+		return x.All
+	}
+	return 0
+}
+
+func (x *HealthPingMeasurementResult) GetFail() int64 {
+	if x != nil {
+		return x.Fail
+	}
+	return 0
+}
+
+func (x *HealthPingMeasurementResult) GetDeviation() int64 {
+	if x != nil {
+		return x.Deviation
+	}
+	return 0
+}
+
+func (x *HealthPingMeasurementResult) GetAverage() int64 {
+	if x != nil {
+		return x.Average
+	}
+	return 0
+}
+
+func (x *HealthPingMeasurementResult) GetMax() int64 {
+	if x != nil {
+		return x.Max
+	}
+	return 0
+}
+
+func (x *HealthPingMeasurementResult) GetMin() int64 {
+	if x != nil {
+		return x.Min
+	}
+	return 0
+}
+
 type OutboundStatus struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -90,13 +177,14 @@ type OutboundStatus struct {
 	LastSeenTime int64 `protobuf:"varint,5,opt,name=last_seen_time,json=lastSeenTime,proto3" json:"last_seen_time,omitempty"`
 	// @Document The time this outbound is tried
 	// @Type id.outboundTag
-	LastTryTime int64 `protobuf:"varint,6,opt,name=last_try_time,json=lastTryTime,proto3" json:"last_try_time,omitempty"`
+	LastTryTime int64                        `protobuf:"varint,6,opt,name=last_try_time,json=lastTryTime,proto3" json:"last_try_time,omitempty"`
+	HealthPing  *HealthPingMeasurementResult `protobuf:"bytes,7,opt,name=health_ping,json=healthPing,proto3" json:"health_ping,omitempty"`
 }
 
 func (x *OutboundStatus) Reset() {
 	*x = OutboundStatus{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_observatory_config_proto_msgTypes[1]
+		mi := &file_app_observatory_config_proto_msgTypes[2]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -109,7 +197,7 @@ func (x *OutboundStatus) String() string {
 func (*OutboundStatus) ProtoMessage() {}
 
 func (x *OutboundStatus) ProtoReflect() protoreflect.Message {
-	mi := &file_app_observatory_config_proto_msgTypes[1]
+	mi := &file_app_observatory_config_proto_msgTypes[2]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -122,7 +210,7 @@ func (x *OutboundStatus) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use OutboundStatus.ProtoReflect.Descriptor instead.
 func (*OutboundStatus) Descriptor() ([]byte, []int) {
-	return file_app_observatory_config_proto_rawDescGZIP(), []int{1}
+	return file_app_observatory_config_proto_rawDescGZIP(), []int{2}
 }
 
 func (x *OutboundStatus) GetAlive() bool {
@@ -167,6 +255,13 @@ func (x *OutboundStatus) GetLastTryTime() int64 {
 	return 0
 }
 
+func (x *OutboundStatus) GetHealthPing() *HealthPingMeasurementResult {
+	if x != nil {
+		return x.HealthPing
+	}
+	return nil
+}
+
 type ProbeResult struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -187,7 +282,7 @@ type ProbeResult struct {
 func (x *ProbeResult) Reset() {
 	*x = ProbeResult{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_observatory_config_proto_msgTypes[2]
+		mi := &file_app_observatory_config_proto_msgTypes[3]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -200,7 +295,7 @@ func (x *ProbeResult) String() string {
 func (*ProbeResult) ProtoMessage() {}
 
 func (x *ProbeResult) ProtoReflect() protoreflect.Message {
-	mi := &file_app_observatory_config_proto_msgTypes[2]
+	mi := &file_app_observatory_config_proto_msgTypes[3]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -213,7 +308,7 @@ func (x *ProbeResult) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use ProbeResult.ProtoReflect.Descriptor instead.
 func (*ProbeResult) Descriptor() ([]byte, []int) {
-	return file_app_observatory_config_proto_rawDescGZIP(), []int{2}
+	return file_app_observatory_config_proto_rawDescGZIP(), []int{3}
 }
 
 func (x *ProbeResult) GetAlive() bool {
@@ -250,7 +345,7 @@ type Intensity struct {
 func (x *Intensity) Reset() {
 	*x = Intensity{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_observatory_config_proto_msgTypes[3]
+		mi := &file_app_observatory_config_proto_msgTypes[4]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -263,7 +358,7 @@ func (x *Intensity) String() string {
 func (*Intensity) ProtoMessage() {}
 
 func (x *Intensity) ProtoReflect() protoreflect.Message {
-	mi := &file_app_observatory_config_proto_msgTypes[3]
+	mi := &file_app_observatory_config_proto_msgTypes[4]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -276,7 +371,7 @@ func (x *Intensity) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Intensity.ProtoReflect.Descriptor instead.
 func (*Intensity) Descriptor() ([]byte, []int) {
-	return file_app_observatory_config_proto_rawDescGZIP(), []int{3}
+	return file_app_observatory_config_proto_rawDescGZIP(), []int{4}
 }
 
 func (x *Intensity) GetProbeInterval() uint32 {
@@ -301,7 +396,7 @@ type Config struct {
 func (x *Config) Reset() {
 	*x = Config{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_observatory_config_proto_msgTypes[4]
+		mi := &file_app_observatory_config_proto_msgTypes[5]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -314,7 +409,7 @@ func (x *Config) String() string {
 func (*Config) ProtoMessage() {}
 
 func (x *Config) ProtoReflect() protoreflect.Message {
-	mi := &file_app_observatory_config_proto_msgTypes[4]
+	mi := &file_app_observatory_config_proto_msgTypes[5]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -327,7 +422,7 @@ func (x *Config) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Config.ProtoReflect.Descriptor instead.
 func (*Config) Descriptor() ([]byte, []int) {
-	return file_app_observatory_config_proto_rawDescGZIP(), []int{4}
+	return file_app_observatory_config_proto_rawDescGZIP(), []int{5}
 }
 
 func (x *Config) GetSubjectSelector() []string {
@@ -370,47 +465,62 @@ var file_app_observatory_config_proto_rawDesc = []byte{
 	0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63, 0x6f, 0x72, 0x65, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x6f,
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 	0x75, 0x6e, 0x64, 0x53, 0x74, 0x61, 0x74, 0x75, 0x73, 0x52, 0x06, 0x73, 0x74, 0x61, 0x74, 0x75,
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+	0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x6f, 0x62, 0x73, 0x65, 0x72, 0x76, 0x61,
+	0x74, 0x6f, 0x72, 0x79, 0x50, 0x01, 0x5a, 0x29, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63,
+	0x6f, 0x6d, 0x2f, 0x78, 0x74, 0x6c, 0x73, 0x2f, 0x78, 0x72, 0x61, 0x79, 0x2d, 0x63, 0x6f, 0x72,
+	0x65, 0x2f, 0x61, 0x70, 0x70, 0x2f, 0x6f, 0x62, 0x73, 0x65, 0x72, 0x76, 0x61, 0x74, 0x6f, 0x72,
+	0x79, 0xaa, 0x02, 0x14, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x41, 0x70, 0x70, 0x2e, 0x4f, 0x62, 0x73,
+	0x65, 0x72, 0x76, 0x61, 0x74, 0x6f, 0x72, 0x79, 0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -425,21 +535,23 @@ func file_app_observatory_config_proto_rawDescGZIP() []byte {
 	return file_app_observatory_config_proto_rawDescData
 }
 
-var file_app_observatory_config_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
+var file_app_observatory_config_proto_msgTypes = make([]protoimpl.MessageInfo, 6)
 var file_app_observatory_config_proto_goTypes = []interface{}{
-	(*ObservationResult)(nil), // 0: xray.core.app.observatory.ObservationResult
-	(*OutboundStatus)(nil),    // 1: xray.core.app.observatory.OutboundStatus
-	(*ProbeResult)(nil),       // 2: xray.core.app.observatory.ProbeResult
-	(*Intensity)(nil),         // 3: xray.core.app.observatory.Intensity
-	(*Config)(nil),            // 4: xray.core.app.observatory.Config
+	(*ObservationResult)(nil),           // 0: xray.core.app.observatory.ObservationResult
+	(*HealthPingMeasurementResult)(nil), // 1: xray.core.app.observatory.HealthPingMeasurementResult
+	(*OutboundStatus)(nil),              // 2: xray.core.app.observatory.OutboundStatus
+	(*ProbeResult)(nil),                 // 3: xray.core.app.observatory.ProbeResult
+	(*Intensity)(nil),                   // 4: xray.core.app.observatory.Intensity
+	(*Config)(nil),                      // 5: xray.core.app.observatory.Config
 }
 var file_app_observatory_config_proto_depIdxs = []int32{
-	1, // 0: xray.core.app.observatory.ObservationResult.status:type_name -> xray.core.app.observatory.OutboundStatus
-	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
+	2, // 0: xray.core.app.observatory.ObservationResult.status:type_name -> xray.core.app.observatory.OutboundStatus
+	1, // 1: xray.core.app.observatory.OutboundStatus.health_ping:type_name -> xray.core.app.observatory.HealthPingMeasurementResult
+	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_app_observatory_config_proto_init() }
@@ -461,7 +573,7 @@ func file_app_observatory_config_proto_init() {
 			}
 		}
 		file_app_observatory_config_proto_msgTypes[1].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*OutboundStatus); i {
+			switch v := v.(*HealthPingMeasurementResult); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -473,7 +585,7 @@ func file_app_observatory_config_proto_init() {
 			}
 		}
 		file_app_observatory_config_proto_msgTypes[2].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ProbeResult); i {
+			switch v := v.(*OutboundStatus); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -485,7 +597,7 @@ func file_app_observatory_config_proto_init() {
 			}
 		}
 		file_app_observatory_config_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Intensity); i {
+			switch v := v.(*ProbeResult); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -497,6 +609,18 @@ func file_app_observatory_config_proto_init() {
 			}
 		}
 		file_app_observatory_config_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Intensity); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_observatory_config_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Config); i {
 			case 0:
 				return &v.state
@@ -515,7 +639,7 @@ func file_app_observatory_config_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_app_observatory_config_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   5,
+			NumMessages:   6,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

app/observatory/config.proto

@@ -10,6 +10,15 @@ message ObservationResult {
   repeated OutboundStatus status = 1;
 }
 
+message HealthPingMeasurementResult {
+  int64 all = 1;
+  int64 fail = 2;
+  int64 deviation = 3;
+  int64 average = 4;
+  int64 max = 5;
+  int64 min = 6;
+}
+
 message OutboundStatus{
   /* @Document Whether this outbound is usable
      @Restriction ReadOnlyForUser
@@ -36,6 +45,8 @@ message OutboundStatus{
    @Type id.outboundTag
 */
   int64 last_try_time = 6;
+
+  HealthPingMeasurementResult health_ping = 7;
 }
 
 message ProbeResult{

app/policy/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/policy/config.proto
 

app/proxyman/command/command.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/proxyman/command/command.proto
 

app/proxyman/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/proxyman/config.proto
 

app/proxyman/inbound/worker.go

@@ -60,6 +60,7 @@ func (w *tcpWorker) callback(conn stat.Connection) {
 	sid := session.NewID()
 	ctx = session.ContextWithID(ctx, sid)
 
+	var outbound = &session.Outbound{}
 	if w.recvOrigDest {
 		var dest net.Destination
 		switch getTProxyType(w.stream) {
@@ -74,11 +75,10 @@ func (w *tcpWorker) callback(conn stat.Connection) {
 			dest = net.DestinationFromAddr(conn.LocalAddr())
 		}
 		if dest.IsValid() {
-			ctx = session.ContextWithOutbound(ctx, &session.Outbound{
-				Target: dest,
-			})
+			outbound.Target = dest
 		}
 	}
+	ctx = session.ContextWithOutbound(ctx, outbound)
 
 	if w.uplinkCounter != nil || w.downlinkCounter != nil {
 		conn = &stat.CounterConnection{

app/proxyman/outbound/handler.go

@@ -229,6 +229,10 @@ func (h *Handler) Address() net.Address {
 	return h.senderSettings.Via.AsAddress()
 }
 
+func (h *Handler) DestIpAddress() net.IP {
+	return internet.DestIpAddress()
+}
+
 // Dial implements internet.Dialer.
 func (h *Handler) Dial(ctx context.Context, dest net.Destination) (stat.Connection, error) {
 	if h.senderSettings != nil {
@@ -274,7 +278,12 @@ func (h *Handler) Dial(ctx context.Context, dest net.Destination) (stat.Connecti
 	}
 
 	conn, err := internet.Dial(ctx, dest, h.streamSettings)
-	return h.getStatCouterConnection(conn), err
+	conn = h.getStatCouterConnection(conn)
+	outbound := session.OutboundFromContext(ctx)
+	if outbound != nil {
+		outbound.Conn = conn
+	}
+	return conn, err
 }
 
 func (h *Handler) getStatCouterConnection(conn stat.Connection) stat.Connection {

app/proxyman/outbound/handler_test.go

@@ -2,9 +2,14 @@ package outbound_test
 
 import (
 	"context"
+	"fmt"
+	"sync"
+	"sync/atomic"
 	"testing"
+	"time"
 
 	"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/stats"
 	"github.com/xtls/xray-core/common/net"
@@ -78,3 +83,91 @@ func TestOutboundWithStatCounter(t *testing.T) {
 		t.Errorf("Expected conn to be CounterConnection")
 	}
 }
+
+func TestTagsCache(t *testing.T) {
+
+	test_duration := 10 * time.Second
+	threads_num := 50
+	delay := 10 * time.Millisecond
+	tags_prefix := "node"
+
+	tags := sync.Map{}
+	counter := atomic.Uint64{}
+
+	ohm, err := New(context.Background(), &proxyman.OutboundConfig{})
+	if err != nil {
+		t.Error("failed to create outbound handler manager")
+	}
+	config := &core.Config{
+		App: []*serial.TypedMessage{},
+	}
+	v, _ := core.New(config)
+	v.AddFeature(ohm)
+	ctx := context.WithValue(context.Background(), xrayKey, v)
+
+	stop_add_rm := false
+	wg_add_rm := sync.WaitGroup{}
+	addHandlers := func() {
+		defer wg_add_rm.Done()
+		for !stop_add_rm {
+			time.Sleep(delay)
+			idx := counter.Add(1)
+			tag := fmt.Sprintf("%s%d", tags_prefix, idx)
+			cfg := &core.OutboundHandlerConfig{
+				Tag:           tag,
+				ProxySettings: serial.ToTypedMessage(&freedom.Config{}),
+			}
+			if h, err := NewHandler(ctx, cfg); err == nil {
+				if err := ohm.AddHandler(ctx, h); err == nil {
+					// t.Log("add handler:", tag)
+					tags.Store(tag, nil)
+				} else {
+					t.Error("failed to add handler:", tag)
+				}
+			} else {
+				t.Error("failed to create handler:", tag)
+			}
+		}
+	}
+
+	rmHandlers := func() {
+		defer wg_add_rm.Done()
+		for !stop_add_rm {
+			time.Sleep(delay)
+			tags.Range(func(key interface{}, value interface{}) bool {
+				if _, ok := tags.LoadAndDelete(key); ok {
+					// t.Log("remove handler:", key)
+					ohm.RemoveHandler(ctx, key.(string))
+					return false
+				}
+				return true
+			})
+		}
+	}
+
+	selectors := []string{tags_prefix}
+	wg_get := sync.WaitGroup{}
+	stop_get := false
+	getTags := func() {
+		defer wg_get.Done()
+		for !stop_get {
+			time.Sleep(delay)
+			_ = ohm.Select(selectors)
+			// t.Logf("get tags: %v", tag)
+		}
+	}
+
+	for i := 0; i < threads_num; i++ {
+		wg_add_rm.Add(2)
+		go rmHandlers()
+		go addHandlers()
+		wg_get.Add(1)
+		go getTags()
+	}
+
+	time.Sleep(test_duration)
+	stop_add_rm = true
+	wg_add_rm.Wait()
+	stop_get = true
+	wg_get.Wait()
+}

app/proxyman/outbound/outbound.go

@@ -4,6 +4,7 @@ package outbound
 
 import (
 	"context"
+	"sort"
 	"strings"
 	"sync"
 
@@ -21,12 +22,14 @@ type Manager struct {
 	taggedHandler    map[string]outbound.Handler
 	untaggedHandlers []outbound.Handler
 	running          bool
+	tagsCache        *sync.Map
 }
 
 // New creates a new Manager.
 func New(ctx context.Context, config *proxyman.OutboundConfig) (*Manager, error) {
 	m := &Manager{
 		taggedHandler: make(map[string]outbound.Handler),
+		tagsCache:     &sync.Map{},
 	}
 	return m, nil
 }
@@ -103,6 +106,8 @@ func (m *Manager) AddHandler(ctx context.Context, handler outbound.Handler) erro
 	m.access.Lock()
 	defer m.access.Unlock()
 
+	m.tagsCache = &sync.Map{}
+
 	if m.defaultHandler == nil {
 		m.defaultHandler = handler
 	}
@@ -132,6 +137,8 @@ func (m *Manager) RemoveHandler(ctx context.Context, tag string) error {
 	m.access.Lock()
 	defer m.access.Unlock()
 
+	m.tagsCache = &sync.Map{}
+
 	delete(m.taggedHandler, tag)
 	if m.defaultHandler != nil && m.defaultHandler.Tag() == tag {
 		m.defaultHandler = nil
@@ -142,24 +149,29 @@ func (m *Manager) RemoveHandler(ctx context.Context, tag string) error {
 
 // Select implements outbound.HandlerSelector.
 func (m *Manager) Select(selectors []string) []string {
+
+	key := strings.Join(selectors, ",")
+	if cache, ok := m.tagsCache.Load(key); ok {
+		return cache.([]string)
+	}
+
 	m.access.RLock()
 	defer m.access.RUnlock()
 
 	tags := make([]string, 0, len(selectors))
 
 	for tag := range m.taggedHandler {
-		match := false
 		for _, selector := range selectors {
 			if strings.HasPrefix(tag, selector) {
-				match = true
+				tags = append(tags, tag)
 				break
 			}
 		}
-		if match {
-			tags = append(tags, tag)
-		}
 	}
 
+	sort.Strings(tags)
+	m.tagsCache.Store(key, tags)
+
 	return tags
 }
 

app/reverse/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/reverse/config.proto
 

app/router/balancing.go

@@ -2,8 +2,8 @@ package router
 
 import (
 	"context"
+	sync "sync"
 
-	"github.com/xtls/xray-core/common/dice"
 	"github.com/xtls/xray-core/features/extension"
 	"github.com/xtls/xray-core/features/outbound"
 )
@@ -12,34 +12,59 @@ type BalancingStrategy interface {
 	PickOutbound([]string) string
 }
 
-type RandomStrategy struct{}
+type BalancingPrincipleTarget interface {
+	GetPrincipleTarget([]string) []string
+}
 
-func (s *RandomStrategy) PickOutbound(tags []string) string {
+type RoundRobinStrategy struct {
+	mu    sync.Mutex
+	index int
+}
+
+func (s *RoundRobinStrategy) PickOutbound(tags []string) string {
 	n := len(tags)
 	if n == 0 {
 		panic("0 tags")
 	}
 
-	return tags[dice.Roll(n)]
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	tag := tags[s.index%n]
+	s.index = (s.index + 1) % n
+	return tag
 }
 
 type Balancer struct {
-	selectors []string
-	strategy  BalancingStrategy
-	ohm       outbound.Manager
+	selectors   []string
+	strategy    BalancingStrategy
+	ohm         outbound.Manager
+	fallbackTag string
+
+	override override
 }
 
+// PickOutbound picks the tag of a outbound
 func (b *Balancer) PickOutbound() (string, error) {
-	hs, ok := b.ohm.(outbound.HandlerSelector)
-	if !ok {
-		return "", newError("outbound.Manager is not a HandlerSelector")
+	candidates, err := b.SelectOutbounds()
+	if err != nil {
+		if b.fallbackTag != "" {
+			newError("fallback to [", b.fallbackTag, "], due to error: ", err).AtInfo().WriteToLog()
+			return b.fallbackTag, nil
+		}
+		return "", err
 	}
-	tags := hs.Select(b.selectors)
-	if len(tags) == 0 {
-		return "", newError("no available outbounds selected")
+	var tag string
+	if o := b.override.Get(); o != "" {
+		tag = o
+	} else {
+		tag = b.strategy.PickOutbound(candidates)
 	}
-	tag := b.strategy.PickOutbound(tags)
 	if tag == "" {
+		if b.fallbackTag != "" {
+			newError("fallback to [", b.fallbackTag, "], due to empty tag returned").AtInfo().WriteToLog()
+			return b.fallbackTag, nil
+		}
+		// will use default handler
 		return "", newError("balancing strategy returns empty tag")
 	}
 	return tag, nil
@@ -50,3 +75,45 @@ func (b *Balancer) InjectContext(ctx context.Context) {
 		contextReceiver.InjectContext(ctx)
 	}
 }
+
+// SelectOutbounds select outbounds with selectors of the Balancer
+func (b *Balancer) SelectOutbounds() ([]string, error) {
+	hs, ok := b.ohm.(outbound.HandlerSelector)
+	if !ok {
+		return nil, newError("outbound.Manager is not a HandlerSelector")
+	}
+	tags := hs.Select(b.selectors)
+	return tags, nil
+}
+
+// GetPrincipleTarget implements routing.BalancerPrincipleTarget
+func (r *Router) GetPrincipleTarget(tag string) ([]string, error) {
+	if b, ok := r.balancers[tag]; ok {
+		if s, ok := b.strategy.(BalancingPrincipleTarget); ok {
+			candidates, err := b.SelectOutbounds()
+			if err != nil {
+				return nil, newError("unable to select outbounds").Base(err)
+			}
+			return s.GetPrincipleTarget(candidates), nil
+		}
+		return nil, newError("unsupported GetPrincipleTarget")
+	}
+	return nil, newError("cannot find tag")
+}
+
+// SetOverrideTarget implements routing.BalancerOverrider
+func (r *Router) SetOverrideTarget(tag, target string) error {
+	if b, ok := r.balancers[tag]; ok {
+		b.override.Put(target)
+		return nil
+	}
+	return newError("cannot find tag")
+}
+
+// GetOverrideTarget implements routing.BalancerOverrider
+func (r *Router) GetOverrideTarget(tag string) (string, error) {
+	if b, ok := r.balancers[tag]; ok {
+		return b.override.Get(), nil
+	}
+	return "", newError("cannot find tag")
+}

app/router/balancing_override.go

@@ -0,0 +1,50 @@
+package router
+
+import (
+	sync "sync"
+)
+
+func (r *Router) OverrideBalancer(balancer string, target string) error {
+	var b *Balancer
+	for tag, bl := range r.balancers {
+		if tag == balancer {
+			b = bl
+			break
+		}
+	}
+	if b == nil {
+		return newError("balancer '", balancer, "' not found")
+	}
+	b.override.Put(target)
+	return nil
+}
+
+type overrideSettings struct {
+	target string
+}
+
+type override struct {
+	access   sync.RWMutex
+	settings overrideSettings
+}
+
+// Get gets the override settings
+func (o *override) Get() string {
+	o.access.RLock()
+	defer o.access.RUnlock()
+	return o.settings.target
+}
+
+// Put updates the override settings
+func (o *override) Put(target string) {
+	o.access.Lock()
+	defer o.access.Unlock()
+	o.settings.target = target
+}
+
+// Clear clears the override settings
+func (o *override) Clear() {
+	o.access.Lock()
+	defer o.access.Unlock()
+	o.settings.target = ""
+}

app/router/command/command.go

@@ -19,6 +19,41 @@ type routingServer struct {
 	routingStats stats.Channel
 }
 
+func (s *routingServer) GetBalancerInfo(ctx context.Context, request *GetBalancerInfoRequest) (*GetBalancerInfoResponse, error) {
+	var ret GetBalancerInfoResponse
+	ret.Balancer = &BalancerMsg{}
+	if bo, ok := s.router.(routing.BalancerOverrider); ok {
+		{
+			res, err := bo.GetOverrideTarget(request.GetTag())
+			if err != nil {
+				return nil, err
+			}
+			ret.Balancer.Override = &OverrideInfo{
+				Target: res,
+			}
+		}
+	}
+
+	if pt, ok := s.router.(routing.BalancerPrincipleTarget); ok {
+		{
+			res, err := pt.GetPrincipleTarget(request.GetTag())
+			if err != nil {
+				newError("unable to obtain principle target").Base(err).AtInfo().WriteToLog()
+			} else {
+				ret.Balancer.PrincipleTarget = &PrincipleTargetInfo{Tag: res}
+			}
+		}
+	}
+	return &ret, nil
+}
+
+func (s *routingServer) OverrideBalancerTarget(ctx context.Context, request *OverrideBalancerTargetRequest) (*OverrideBalancerTargetResponse, error) {
+	if bo, ok := s.router.(routing.BalancerOverrider); ok {
+		return &OverrideBalancerTargetResponse{}, bo.SetOverrideTarget(request.BalancerTag, request.Target)
+	}
+	return nil, newError("unsupported router implementation")
+}
+
 // NewRoutingServer creates a statistics service with statistics manager.
 func NewRoutingServer(router routing.Router, routingStats stats.Channel) RoutingServiceServer {
 	return &routingServer{

app/router/command/command.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/router/command/command.proto
 
@@ -294,6 +294,342 @@ func (x *TestRouteRequest) GetPublishResult() bool {
 	return false
 }
 
+type PrincipleTargetInfo struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Tag []string `protobuf:"bytes,1,rep,name=tag,proto3" json:"tag,omitempty"`
+}
+
+func (x *PrincipleTargetInfo) Reset() {
+	*x = PrincipleTargetInfo{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_router_command_command_proto_msgTypes[3]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PrincipleTargetInfo) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PrincipleTargetInfo) ProtoMessage() {}
+
+func (x *PrincipleTargetInfo) ProtoReflect() protoreflect.Message {
+	mi := &file_app_router_command_command_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 PrincipleTargetInfo.ProtoReflect.Descriptor instead.
+func (*PrincipleTargetInfo) Descriptor() ([]byte, []int) {
+	return file_app_router_command_command_proto_rawDescGZIP(), []int{3}
+}
+
+func (x *PrincipleTargetInfo) GetTag() []string {
+	if x != nil {
+		return x.Tag
+	}
+	return nil
+}
+
+type OverrideInfo struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Target string `protobuf:"bytes,2,opt,name=target,proto3" json:"target,omitempty"`
+}
+
+func (x *OverrideInfo) Reset() {
+	*x = OverrideInfo{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_router_command_command_proto_msgTypes[4]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *OverrideInfo) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*OverrideInfo) ProtoMessage() {}
+
+func (x *OverrideInfo) ProtoReflect() protoreflect.Message {
+	mi := &file_app_router_command_command_proto_msgTypes[4]
+	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 OverrideInfo.ProtoReflect.Descriptor instead.
+func (*OverrideInfo) Descriptor() ([]byte, []int) {
+	return file_app_router_command_command_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *OverrideInfo) GetTarget() string {
+	if x != nil {
+		return x.Target
+	}
+	return ""
+}
+
+type BalancerMsg struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Override        *OverrideInfo        `protobuf:"bytes,5,opt,name=override,proto3" json:"override,omitempty"`
+	PrincipleTarget *PrincipleTargetInfo `protobuf:"bytes,6,opt,name=principle_target,json=principleTarget,proto3" json:"principle_target,omitempty"`
+}
+
+func (x *BalancerMsg) Reset() {
+	*x = BalancerMsg{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_router_command_command_proto_msgTypes[5]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *BalancerMsg) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*BalancerMsg) ProtoMessage() {}
+
+func (x *BalancerMsg) ProtoReflect() protoreflect.Message {
+	mi := &file_app_router_command_command_proto_msgTypes[5]
+	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 BalancerMsg.ProtoReflect.Descriptor instead.
+func (*BalancerMsg) Descriptor() ([]byte, []int) {
+	return file_app_router_command_command_proto_rawDescGZIP(), []int{5}
+}
+
+func (x *BalancerMsg) GetOverride() *OverrideInfo {
+	if x != nil {
+		return x.Override
+	}
+	return nil
+}
+
+func (x *BalancerMsg) GetPrincipleTarget() *PrincipleTargetInfo {
+	if x != nil {
+		return x.PrincipleTarget
+	}
+	return nil
+}
+
+type GetBalancerInfoRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Tag string `protobuf:"bytes,1,opt,name=tag,proto3" json:"tag,omitempty"`
+}
+
+func (x *GetBalancerInfoRequest) Reset() {
+	*x = GetBalancerInfoRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_router_command_command_proto_msgTypes[6]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetBalancerInfoRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetBalancerInfoRequest) ProtoMessage() {}
+
+func (x *GetBalancerInfoRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_app_router_command_command_proto_msgTypes[6]
+	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 GetBalancerInfoRequest.ProtoReflect.Descriptor instead.
+func (*GetBalancerInfoRequest) Descriptor() ([]byte, []int) {
+	return file_app_router_command_command_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *GetBalancerInfoRequest) GetTag() string {
+	if x != nil {
+		return x.Tag
+	}
+	return ""
+}
+
+type GetBalancerInfoResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Balancer *BalancerMsg `protobuf:"bytes,1,opt,name=balancer,proto3" json:"balancer,omitempty"`
+}
+
+func (x *GetBalancerInfoResponse) Reset() {
+	*x = GetBalancerInfoResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_router_command_command_proto_msgTypes[7]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *GetBalancerInfoResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*GetBalancerInfoResponse) ProtoMessage() {}
+
+func (x *GetBalancerInfoResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_app_router_command_command_proto_msgTypes[7]
+	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 GetBalancerInfoResponse.ProtoReflect.Descriptor instead.
+func (*GetBalancerInfoResponse) Descriptor() ([]byte, []int) {
+	return file_app_router_command_command_proto_rawDescGZIP(), []int{7}
+}
+
+func (x *GetBalancerInfoResponse) GetBalancer() *BalancerMsg {
+	if x != nil {
+		return x.Balancer
+	}
+	return nil
+}
+
+type OverrideBalancerTargetRequest struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	BalancerTag string `protobuf:"bytes,1,opt,name=balancerTag,proto3" json:"balancerTag,omitempty"`
+	Target      string `protobuf:"bytes,2,opt,name=target,proto3" json:"target,omitempty"`
+}
+
+func (x *OverrideBalancerTargetRequest) Reset() {
+	*x = OverrideBalancerTargetRequest{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_router_command_command_proto_msgTypes[8]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *OverrideBalancerTargetRequest) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*OverrideBalancerTargetRequest) ProtoMessage() {}
+
+func (x *OverrideBalancerTargetRequest) ProtoReflect() protoreflect.Message {
+	mi := &file_app_router_command_command_proto_msgTypes[8]
+	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 OverrideBalancerTargetRequest.ProtoReflect.Descriptor instead.
+func (*OverrideBalancerTargetRequest) Descriptor() ([]byte, []int) {
+	return file_app_router_command_command_proto_rawDescGZIP(), []int{8}
+}
+
+func (x *OverrideBalancerTargetRequest) GetBalancerTag() string {
+	if x != nil {
+		return x.BalancerTag
+	}
+	return ""
+}
+
+func (x *OverrideBalancerTargetRequest) GetTarget() string {
+	if x != nil {
+		return x.Target
+	}
+	return ""
+}
+
+type OverrideBalancerTargetResponse struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+}
+
+func (x *OverrideBalancerTargetResponse) Reset() {
+	*x = OverrideBalancerTargetResponse{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_router_command_command_proto_msgTypes[9]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *OverrideBalancerTargetResponse) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*OverrideBalancerTargetResponse) ProtoMessage() {}
+
+func (x *OverrideBalancerTargetResponse) ProtoReflect() protoreflect.Message {
+	mi := &file_app_router_command_command_proto_msgTypes[9]
+	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 OverrideBalancerTargetResponse.ProtoReflect.Descriptor instead.
+func (*OverrideBalancerTargetResponse) Descriptor() ([]byte, []int) {
+	return file_app_router_command_command_proto_rawDescGZIP(), []int{9}
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -303,7 +639,7 @@ type Config struct {
 func (x *Config) Reset() {
 	*x = Config{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_router_command_command_proto_msgTypes[3]
+		mi := &file_app_router_command_command_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -316,7 +652,7 @@ func (x *Config) String() string {
 func (*Config) ProtoMessage() {}
 
 func (x *Config) ProtoReflect() protoreflect.Message {
-	mi := &file_app_router_command_command_proto_msgTypes[3]
+	mi := &file_app_router_command_command_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -329,7 +665,7 @@ func (x *Config) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Config.ProtoReflect.Descriptor instead.
 func (*Config) Descriptor() ([]byte, []int) {
-	return file_app_router_command_command_proto_rawDescGZIP(), []int{3}
+	return file_app_router_command_command_proto_rawDescGZIP(), []int{10}
 }
 
 var File_app_router_command_command_proto protoreflect.FileDescriptor
@@ -390,29 +726,78 @@ var file_app_router_command_command_proto_rawDesc = []byte{
 	0x64, 0x53, 0x65, 0x6c, 0x65, 0x63, 0x74, 0x6f, 0x72, 0x73, 0x12, 0x24, 0x0a, 0x0d, 0x50, 0x75,
 	0x62, 0x6c, 0x69, 0x73, 0x68, 0x52, 0x65, 0x73, 0x75, 0x6c, 0x74, 0x18, 0x03, 0x20, 0x01, 0x28,
 	0x08, 0x52, 0x0d, 0x50, 0x75, 0x62, 0x6c, 0x69, 0x73, 0x68, 0x52, 0x65, 0x73, 0x75, 0x6c, 0x74,
-	0x22, 0x08, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x32, 0xf0, 0x01, 0x0a, 0x0e, 0x52,
-	0x6f, 0x75, 0x74, 0x69, 0x6e, 0x67, 0x53, 0x65, 0x72, 0x76, 0x69, 0x63, 0x65, 0x12, 0x7b, 0x0a,
-	0x15, 0x53, 0x75, 0x62, 0x73, 0x63, 0x72, 0x69, 0x62, 0x65, 0x52, 0x6f, 0x75, 0x74, 0x69, 0x6e,
-	0x67, 0x53, 0x74, 0x61, 0x74, 0x73, 0x12, 0x35, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70,
+	0x22, 0x27, 0x0a, 0x13, 0x50, 0x72, 0x69, 0x6e, 0x63, 0x69, 0x70, 0x6c, 0x65, 0x54, 0x61, 0x72,
+	0x67, 0x65, 0x74, 0x49, 0x6e, 0x66, 0x6f, 0x12, 0x10, 0x0a, 0x03, 0x74, 0x61, 0x67, 0x18, 0x01,
+	0x20, 0x03, 0x28, 0x09, 0x52, 0x03, 0x74, 0x61, 0x67, 0x22, 0x26, 0x0a, 0x0c, 0x4f, 0x76, 0x65,
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 }
 
 var (
@@ -427,28 +812,42 @@ func file_app_router_command_command_proto_rawDescGZIP() []byte {
 	return file_app_router_command_command_proto_rawDescData
 }
 
-var file_app_router_command_command_proto_msgTypes = make([]protoimpl.MessageInfo, 5)
+var file_app_router_command_command_proto_msgTypes = make([]protoimpl.MessageInfo, 12)
 var file_app_router_command_command_proto_goTypes = []interface{}{
-	(*RoutingContext)(nil),               // 0: xray.app.router.command.RoutingContext
-	(*SubscribeRoutingStatsRequest)(nil), // 1: xray.app.router.command.SubscribeRoutingStatsRequest
-	(*TestRouteRequest)(nil),             // 2: xray.app.router.command.TestRouteRequest
-	(*Config)(nil),                       // 3: xray.app.router.command.Config
-	nil,                                  // 4: xray.app.router.command.RoutingContext.AttributesEntry
-	(net.Network)(0),                     // 5: xray.common.net.Network
+	(*RoutingContext)(nil),                 // 0: xray.app.router.command.RoutingContext
+	(*SubscribeRoutingStatsRequest)(nil),   // 1: xray.app.router.command.SubscribeRoutingStatsRequest
+	(*TestRouteRequest)(nil),               // 2: xray.app.router.command.TestRouteRequest
+	(*PrincipleTargetInfo)(nil),            // 3: xray.app.router.command.PrincipleTargetInfo
+	(*OverrideInfo)(nil),                   // 4: xray.app.router.command.OverrideInfo
+	(*BalancerMsg)(nil),                    // 5: xray.app.router.command.BalancerMsg
+	(*GetBalancerInfoRequest)(nil),         // 6: xray.app.router.command.GetBalancerInfoRequest
+	(*GetBalancerInfoResponse)(nil),        // 7: xray.app.router.command.GetBalancerInfoResponse
+	(*OverrideBalancerTargetRequest)(nil),  // 8: xray.app.router.command.OverrideBalancerTargetRequest
+	(*OverrideBalancerTargetResponse)(nil), // 9: xray.app.router.command.OverrideBalancerTargetResponse
+	(*Config)(nil),                         // 10: xray.app.router.command.Config
+	nil,                                    // 11: xray.app.router.command.RoutingContext.AttributesEntry
+	(net.Network)(0),                       // 12: xray.common.net.Network
 }
 var file_app_router_command_command_proto_depIdxs = []int32{
-	5, // 0: xray.app.router.command.RoutingContext.Network:type_name -> xray.common.net.Network
-	4, // 1: xray.app.router.command.RoutingContext.Attributes:type_name -> xray.app.router.command.RoutingContext.AttributesEntry
-	0, // 2: xray.app.router.command.TestRouteRequest.RoutingContext:type_name -> xray.app.router.command.RoutingContext
-	1, // 3: xray.app.router.command.RoutingService.SubscribeRoutingStats:input_type -> xray.app.router.command.SubscribeRoutingStatsRequest
-	2, // 4: xray.app.router.command.RoutingService.TestRoute:input_type -> xray.app.router.command.TestRouteRequest
-	0, // 5: xray.app.router.command.RoutingService.SubscribeRoutingStats:output_type -> xray.app.router.command.RoutingContext
-	0, // 6: xray.app.router.command.RoutingService.TestRoute:output_type -> xray.app.router.command.RoutingContext
-	5, // [5:7] is the sub-list for method output_type
-	3, // [3:5] is the sub-list for method input_type
-	3, // [3:3] is the sub-list for extension type_name
-	3, // [3:3] is the sub-list for extension extendee
-	0, // [0:3] is the sub-list for field type_name
+	12, // 0: xray.app.router.command.RoutingContext.Network:type_name -> xray.common.net.Network
+	11, // 1: xray.app.router.command.RoutingContext.Attributes:type_name -> xray.app.router.command.RoutingContext.AttributesEntry
+	0,  // 2: xray.app.router.command.TestRouteRequest.RoutingContext:type_name -> xray.app.router.command.RoutingContext
+	4,  // 3: xray.app.router.command.BalancerMsg.override:type_name -> xray.app.router.command.OverrideInfo
+	3,  // 4: xray.app.router.command.BalancerMsg.principle_target:type_name -> xray.app.router.command.PrincipleTargetInfo
+	5,  // 5: xray.app.router.command.GetBalancerInfoResponse.balancer:type_name -> xray.app.router.command.BalancerMsg
+	1,  // 6: xray.app.router.command.RoutingService.SubscribeRoutingStats:input_type -> xray.app.router.command.SubscribeRoutingStatsRequest
+	2,  // 7: xray.app.router.command.RoutingService.TestRoute:input_type -> xray.app.router.command.TestRouteRequest
+	6,  // 8: xray.app.router.command.RoutingService.GetBalancerInfo:input_type -> xray.app.router.command.GetBalancerInfoRequest
+	8,  // 9: xray.app.router.command.RoutingService.OverrideBalancerTarget:input_type -> xray.app.router.command.OverrideBalancerTargetRequest
+	0,  // 10: xray.app.router.command.RoutingService.SubscribeRoutingStats:output_type -> xray.app.router.command.RoutingContext
+	0,  // 11: xray.app.router.command.RoutingService.TestRoute:output_type -> xray.app.router.command.RoutingContext
+	7,  // 12: xray.app.router.command.RoutingService.GetBalancerInfo:output_type -> xray.app.router.command.GetBalancerInfoResponse
+	9,  // 13: xray.app.router.command.RoutingService.OverrideBalancerTarget:output_type -> xray.app.router.command.OverrideBalancerTargetResponse
+	10, // [10:14] is the sub-list for method output_type
+	6,  // [6:10] is the sub-list for method input_type
+	6,  // [6:6] is the sub-list for extension type_name
+	6,  // [6:6] is the sub-list for extension extendee
+	0,  // [0:6] is the sub-list for field type_name
 }
 
 func init() { file_app_router_command_command_proto_init() }
@@ -494,6 +893,90 @@ func file_app_router_command_command_proto_init() {
 			}
 		}
 		file_app_router_command_command_proto_msgTypes[3].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*PrincipleTargetInfo); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_router_command_command_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*OverrideInfo); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_router_command_command_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*BalancerMsg); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_router_command_command_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetBalancerInfoRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_router_command_command_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*GetBalancerInfoResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_router_command_command_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*OverrideBalancerTargetRequest); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_router_command_command_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*OverrideBalancerTargetResponse); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_router_command_command_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Config); i {
 			case 0:
 				return &v.state
@@ -512,7 +995,7 @@ func file_app_router_command_command_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_app_router_command_command_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   5,
+			NumMessages:   12,
 			NumExtensions: 0,
 			NumServices:   1,
 		},

app/router/command/command.proto

@@ -60,10 +60,41 @@ message TestRouteRequest {
   bool PublishResult = 3;
 }
 
+message PrincipleTargetInfo {
+  repeated string tag = 1;
+}
+
+message OverrideInfo {
+  string target = 2;
+}
+
+message BalancerMsg {
+  OverrideInfo override = 5;
+  PrincipleTargetInfo principle_target = 6;
+}
+
+message GetBalancerInfoRequest {
+  string tag = 1;
+}
+
+message GetBalancerInfoResponse {
+  BalancerMsg balancer = 1;
+}
+
+message OverrideBalancerTargetRequest {
+  string balancerTag = 1;
+  string target = 2;
+}
+
+message OverrideBalancerTargetResponse {}
+
 service RoutingService {
   rpc SubscribeRoutingStats(SubscribeRoutingStatsRequest)
       returns (stream RoutingContext) {}
   rpc TestRoute(TestRouteRequest) returns (RoutingContext) {}
+
+  rpc GetBalancerInfo(GetBalancerInfoRequest) returns (GetBalancerInfoResponse){}
+  rpc OverrideBalancerTarget(OverrideBalancerTargetRequest) returns (OverrideBalancerTargetResponse) {}
 }
 
 message Config {}

app/router/command/command_grpc.pb.go

@@ -19,8 +19,10 @@ import (
 const _ = grpc.SupportPackageIsVersion7
 
 const (
-	RoutingService_SubscribeRoutingStats_FullMethodName = "/xray.app.router.command.RoutingService/SubscribeRoutingStats"
-	RoutingService_TestRoute_FullMethodName             = "/xray.app.router.command.RoutingService/TestRoute"
+	RoutingService_SubscribeRoutingStats_FullMethodName  = "/xray.app.router.command.RoutingService/SubscribeRoutingStats"
+	RoutingService_TestRoute_FullMethodName              = "/xray.app.router.command.RoutingService/TestRoute"
+	RoutingService_GetBalancerInfo_FullMethodName        = "/xray.app.router.command.RoutingService/GetBalancerInfo"
+	RoutingService_OverrideBalancerTarget_FullMethodName = "/xray.app.router.command.RoutingService/OverrideBalancerTarget"
 )
 
 // RoutingServiceClient is the client API for RoutingService service.
@@ -29,6 +31,8 @@ const (
 type RoutingServiceClient interface {
 	SubscribeRoutingStats(ctx context.Context, in *SubscribeRoutingStatsRequest, opts ...grpc.CallOption) (RoutingService_SubscribeRoutingStatsClient, error)
 	TestRoute(ctx context.Context, in *TestRouteRequest, opts ...grpc.CallOption) (*RoutingContext, error)
+	GetBalancerInfo(ctx context.Context, in *GetBalancerInfoRequest, opts ...grpc.CallOption) (*GetBalancerInfoResponse, error)
+	OverrideBalancerTarget(ctx context.Context, in *OverrideBalancerTargetRequest, opts ...grpc.CallOption) (*OverrideBalancerTargetResponse, error)
 }
 
 type routingServiceClient struct {
@@ -80,12 +84,32 @@ func (c *routingServiceClient) TestRoute(ctx context.Context, in *TestRouteReque
 	return out, nil
 }
 
+func (c *routingServiceClient) GetBalancerInfo(ctx context.Context, in *GetBalancerInfoRequest, opts ...grpc.CallOption) (*GetBalancerInfoResponse, error) {
+	out := new(GetBalancerInfoResponse)
+	err := c.cc.Invoke(ctx, RoutingService_GetBalancerInfo_FullMethodName, in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *routingServiceClient) OverrideBalancerTarget(ctx context.Context, in *OverrideBalancerTargetRequest, opts ...grpc.CallOption) (*OverrideBalancerTargetResponse, error) {
+	out := new(OverrideBalancerTargetResponse)
+	err := c.cc.Invoke(ctx, RoutingService_OverrideBalancerTarget_FullMethodName, in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
 // RoutingServiceServer is the server API for RoutingService service.
 // All implementations must embed UnimplementedRoutingServiceServer
 // for forward compatibility
 type RoutingServiceServer interface {
 	SubscribeRoutingStats(*SubscribeRoutingStatsRequest, RoutingService_SubscribeRoutingStatsServer) error
 	TestRoute(context.Context, *TestRouteRequest) (*RoutingContext, error)
+	GetBalancerInfo(context.Context, *GetBalancerInfoRequest) (*GetBalancerInfoResponse, error)
+	OverrideBalancerTarget(context.Context, *OverrideBalancerTargetRequest) (*OverrideBalancerTargetResponse, error)
 	mustEmbedUnimplementedRoutingServiceServer()
 }
 
@@ -99,6 +123,12 @@ func (UnimplementedRoutingServiceServer) SubscribeRoutingStats(*SubscribeRouting
 func (UnimplementedRoutingServiceServer) TestRoute(context.Context, *TestRouteRequest) (*RoutingContext, error) {
 	return nil, status.Errorf(codes.Unimplemented, "method TestRoute not implemented")
 }
+func (UnimplementedRoutingServiceServer) GetBalancerInfo(context.Context, *GetBalancerInfoRequest) (*GetBalancerInfoResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method GetBalancerInfo not implemented")
+}
+func (UnimplementedRoutingServiceServer) OverrideBalancerTarget(context.Context, *OverrideBalancerTargetRequest) (*OverrideBalancerTargetResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method OverrideBalancerTarget not implemented")
+}
 func (UnimplementedRoutingServiceServer) mustEmbedUnimplementedRoutingServiceServer() {}
 
 // UnsafeRoutingServiceServer may be embedded to opt out of forward compatibility for this service.
@@ -151,6 +181,42 @@ func _RoutingService_TestRoute_Handler(srv interface{}, ctx context.Context, dec
 	return interceptor(ctx, in, info, handler)
 }
 
+func _RoutingService_GetBalancerInfo_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(GetBalancerInfoRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RoutingServiceServer).GetBalancerInfo(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: RoutingService_GetBalancerInfo_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RoutingServiceServer).GetBalancerInfo(ctx, req.(*GetBalancerInfoRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _RoutingService_OverrideBalancerTarget_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(OverrideBalancerTargetRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RoutingServiceServer).OverrideBalancerTarget(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: RoutingService_OverrideBalancerTarget_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RoutingServiceServer).OverrideBalancerTarget(ctx, req.(*OverrideBalancerTargetRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
 // RoutingService_ServiceDesc is the grpc.ServiceDesc for RoutingService service.
 // It's only intended for direct use with grpc.RegisterService,
 // and not to be introspected or modified (even as a copy)
@@ -162,6 +228,14 @@ var RoutingService_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "TestRoute",
 			Handler:    _RoutingService_TestRoute_Handler,
 		},
+		{
+			MethodName: "GetBalancerInfo",
+			Handler:    _RoutingService_GetBalancerInfo_Handler,
+		},
+		{
+			MethodName: "OverrideBalancerTarget",
+			Handler:    _RoutingService_OverrideBalancerTarget_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{

app/router/command/command_test.go

@@ -16,6 +16,7 @@ import (
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/testing/mocks"
 	"google.golang.org/grpc"
+	"google.golang.org/grpc/credentials/insecure"
 	"google.golang.org/grpc/test/bufconn"
 )
 
@@ -80,7 +81,7 @@ func TestServiceSubscribeRoutingStats(t *testing.T) {
 	// Client goroutine
 	go func() {
 		defer lis.Close()
-		conn, err := grpc.DialContext(context.Background(), "bufnet", grpc.WithContextDialer(bufDialer), grpc.WithInsecure())
+		conn, err := grpc.DialContext(context.Background(), "bufnet", grpc.WithContextDialer(bufDialer), grpc.WithTransportCredentials(insecure.NewCredentials()))
 		if err != nil {
 			errCh <- err
 			return
@@ -214,7 +215,7 @@ func TestServiceSubscribeSubsetOfFields(t *testing.T) {
 	// Client goroutine
 	go func() {
 		defer lis.Close()
-		conn, err := grpc.DialContext(context.Background(), "bufnet", grpc.WithContextDialer(bufDialer), grpc.WithInsecure())
+		conn, err := grpc.DialContext(context.Background(), "bufnet", grpc.WithContextDialer(bufDialer), grpc.WithTransportCredentials(insecure.NewCredentials()))
 		if err != nil {
 			errCh <- err
 			return
@@ -318,7 +319,7 @@ func TestSerivceTestRoute(t *testing.T) {
 				TargetTag: &router.RoutingRule_Tag{Tag: "out"},
 			},
 		},
-	}, mocks.NewDNSClient(mockCtl), mocks.NewOutboundManager(mockCtl)))
+	}, mocks.NewDNSClient(mockCtl), mocks.NewOutboundManager(mockCtl), nil))
 
 	lis := bufconn.Listen(1024 * 1024)
 	bufDialer := func(context.Context, string) (net.Conn, error) {
@@ -337,7 +338,7 @@ func TestSerivceTestRoute(t *testing.T) {
 	// Client goroutine
 	go func() {
 		defer lis.Close()
-		conn, err := grpc.DialContext(context.Background(), "bufnet", grpc.WithContextDialer(bufDialer), grpc.WithInsecure())
+		conn, err := grpc.DialContext(context.Background(), "bufnet", grpc.WithContextDialer(bufDialer), grpc.WithTransportCredentials(insecure.NewCredentials()))
 		if err != nil {
 			errCh <- err
 		}

app/router/config.go

@@ -121,22 +121,45 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 	return conds, nil
 }
 
-func (br *BalancingRule) Build(ohm outbound.Manager) (*Balancer, error) {
-	switch br.Strategy {
-	case "leastPing":
+// Build builds the balancing rule
+func (br *BalancingRule) Build(ohm outbound.Manager, dispatcher routing.Dispatcher) (*Balancer, error) {
+	switch strings.ToLower(br.Strategy) {
+	case "leastping":
 		return &Balancer{
 			selectors: br.OutboundSelector,
 			strategy:  &LeastPingStrategy{},
 			ohm:       ohm,
 		}, nil
-	case "random":
-		fallthrough
-	default:
+	case "roundrobin":
 		return &Balancer{
 			selectors: br.OutboundSelector,
-			strategy:  &RandomStrategy{},
+			strategy:  &RoundRobinStrategy{},
 			ohm:       ohm,
 		}, nil
-
+	case "leastload":
+		i, err := br.StrategySettings.GetInstance()
+		if err != nil {
+			return nil, err
+		}
+		s, ok := i.(*StrategyLeastLoadConfig)
+		if !ok {
+			return nil, newError("not a StrategyLeastLoadConfig").AtError()
+		}
+		leastLoadStrategy := NewLeastLoadStrategy(s)
+		return &Balancer{
+			selectors: br.OutboundSelector,
+			ohm:       ohm, fallbackTag: br.FallbackTag,
+			strategy: leastLoadStrategy,
+		}, nil
+	case "random":
+		fallthrough
+	case "":
+		return &Balancer{
+			selectors: br.OutboundSelector,
+			ohm:       ohm, fallbackTag: br.FallbackTag,
+			strategy: &RandomStrategy{},
+		}, nil
+	default:
+		return nil, newError("unrecognized balancer type")
 	}
 }

app/router/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/router/config.proto
 
@@ -8,6 +8,7 @@ package router
 
 import (
 	net "github.com/xtls/xray-core/common/net"
+	serial "github.com/xtls/xray-core/common/serial"
 	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
 	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
 	reflect "reflect"
@@ -131,7 +132,7 @@ func (x Config_DomainStrategy) Number() protoreflect.EnumNumber {
 
 // Deprecated: Use Config_DomainStrategy.Descriptor instead.
 func (Config_DomainStrategy) EnumDescriptor() ([]byte, []int) {
-	return file_app_router_config_proto_rawDescGZIP(), []int{8, 0}
+	return file_app_router_config_proto_rawDescGZIP(), []int{10, 0}
 }
 
 // Domain for routing decision.
@@ -707,9 +708,11 @@ type BalancingRule struct {
 	sizeCache     protoimpl.SizeCache
 	unknownFields protoimpl.UnknownFields
 
-	Tag              string   `protobuf:"bytes,1,opt,name=tag,proto3" json:"tag,omitempty"`
-	OutboundSelector []string `protobuf:"bytes,2,rep,name=outbound_selector,json=outboundSelector,proto3" json:"outbound_selector,omitempty"`
-	Strategy         string   `protobuf:"bytes,3,opt,name=strategy,proto3" json:"strategy,omitempty"`
+	Tag              string               `protobuf:"bytes,1,opt,name=tag,proto3" json:"tag,omitempty"`
+	OutboundSelector []string             `protobuf:"bytes,2,rep,name=outbound_selector,json=outboundSelector,proto3" json:"outbound_selector,omitempty"`
+	Strategy         string               `protobuf:"bytes,3,opt,name=strategy,proto3" json:"strategy,omitempty"`
+	StrategySettings *serial.TypedMessage `protobuf:"bytes,4,opt,name=strategy_settings,json=strategySettings,proto3" json:"strategy_settings,omitempty"`
+	FallbackTag      string               `protobuf:"bytes,5,opt,name=fallback_tag,json=fallbackTag,proto3" json:"fallback_tag,omitempty"`
 }
 
 func (x *BalancingRule) Reset() {
@@ -765,6 +768,167 @@ func (x *BalancingRule) GetStrategy() string {
 	return ""
 }
 
+func (x *BalancingRule) GetStrategySettings() *serial.TypedMessage {
+	if x != nil {
+		return x.StrategySettings
+	}
+	return nil
+}
+
+func (x *BalancingRule) GetFallbackTag() string {
+	if x != nil {
+		return x.FallbackTag
+	}
+	return ""
+}
+
+type StrategyWeight struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Regexp bool    `protobuf:"varint,1,opt,name=regexp,proto3" json:"regexp,omitempty"`
+	Match  string  `protobuf:"bytes,2,opt,name=match,proto3" json:"match,omitempty"`
+	Value  float32 `protobuf:"fixed32,3,opt,name=value,proto3" json:"value,omitempty"`
+}
+
+func (x *StrategyWeight) Reset() {
+	*x = StrategyWeight{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_router_config_proto_msgTypes[8]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *StrategyWeight) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*StrategyWeight) ProtoMessage() {}
+
+func (x *StrategyWeight) ProtoReflect() protoreflect.Message {
+	mi := &file_app_router_config_proto_msgTypes[8]
+	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 StrategyWeight.ProtoReflect.Descriptor instead.
+func (*StrategyWeight) Descriptor() ([]byte, []int) {
+	return file_app_router_config_proto_rawDescGZIP(), []int{8}
+}
+
+func (x *StrategyWeight) GetRegexp() bool {
+	if x != nil {
+		return x.Regexp
+	}
+	return false
+}
+
+func (x *StrategyWeight) GetMatch() string {
+	if x != nil {
+		return x.Match
+	}
+	return ""
+}
+
+func (x *StrategyWeight) GetValue() float32 {
+	if x != nil {
+		return x.Value
+	}
+	return 0
+}
+
+type StrategyLeastLoadConfig struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// weight settings
+	Costs []*StrategyWeight `protobuf:"bytes,2,rep,name=costs,proto3" json:"costs,omitempty"`
+	// RTT baselines for selecting, int64 values of time.Duration
+	Baselines []int64 `protobuf:"varint,3,rep,packed,name=baselines,proto3" json:"baselines,omitempty"`
+	// expected nodes count to select
+	Expected int32 `protobuf:"varint,4,opt,name=expected,proto3" json:"expected,omitempty"`
+	// max acceptable rtt, filter away high delay nodes. defalut 0
+	MaxRTT int64 `protobuf:"varint,5,opt,name=maxRTT,proto3" json:"maxRTT,omitempty"`
+	// acceptable failure rate
+	Tolerance float32 `protobuf:"fixed32,6,opt,name=tolerance,proto3" json:"tolerance,omitempty"`
+}
+
+func (x *StrategyLeastLoadConfig) Reset() {
+	*x = StrategyLeastLoadConfig{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_router_config_proto_msgTypes[9]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *StrategyLeastLoadConfig) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*StrategyLeastLoadConfig) ProtoMessage() {}
+
+func (x *StrategyLeastLoadConfig) ProtoReflect() protoreflect.Message {
+	mi := &file_app_router_config_proto_msgTypes[9]
+	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 StrategyLeastLoadConfig.ProtoReflect.Descriptor instead.
+func (*StrategyLeastLoadConfig) Descriptor() ([]byte, []int) {
+	return file_app_router_config_proto_rawDescGZIP(), []int{9}
+}
+
+func (x *StrategyLeastLoadConfig) GetCosts() []*StrategyWeight {
+	if x != nil {
+		return x.Costs
+	}
+	return nil
+}
+
+func (x *StrategyLeastLoadConfig) GetBaselines() []int64 {
+	if x != nil {
+		return x.Baselines
+	}
+	return nil
+}
+
+func (x *StrategyLeastLoadConfig) GetExpected() int32 {
+	if x != nil {
+		return x.Expected
+	}
+	return 0
+}
+
+func (x *StrategyLeastLoadConfig) GetMaxRTT() int64 {
+	if x != nil {
+		return x.MaxRTT
+	}
+	return 0
+}
+
+func (x *StrategyLeastLoadConfig) GetTolerance() float32 {
+	if x != nil {
+		return x.Tolerance
+	}
+	return 0
+}
+
 type Config struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -778,7 +942,7 @@ type Config struct {
 func (x *Config) Reset() {
 	*x = Config{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_router_config_proto_msgTypes[8]
+		mi := &file_app_router_config_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -791,7 +955,7 @@ func (x *Config) String() string {
 func (*Config) ProtoMessage() {}
 
 func (x *Config) ProtoReflect() protoreflect.Message {
-	mi := &file_app_router_config_proto_msgTypes[8]
+	mi := &file_app_router_config_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -804,7 +968,7 @@ func (x *Config) ProtoReflect() protoreflect.Message {
 
 // Deprecated: Use Config.ProtoReflect.Descriptor instead.
 func (*Config) Descriptor() ([]byte, []int) {
-	return file_app_router_config_proto_rawDescGZIP(), []int{8}
+	return file_app_router_config_proto_rawDescGZIP(), []int{10}
 }
 
 func (x *Config) GetDomainStrategy() Config_DomainStrategy {
@@ -844,7 +1008,7 @@ type Domain_Attribute struct {
 func (x *Domain_Attribute) Reset() {
 	*x = Domain_Attribute{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_app_router_config_proto_msgTypes[9]
+		mi := &file_app_router_config_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -857,7 +1021,7 @@ func (x *Domain_Attribute) String() string {
 func (*Domain_Attribute) ProtoMessage() {}
 
 func (x *Domain_Attribute) ProtoReflect() protoreflect.Message {
-	mi := &file_app_router_config_proto_msgTypes[9]
+	mi := &file_app_router_config_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -922,142 +1086,169 @@ var File_app_router_config_proto protoreflect.FileDescriptor
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 }
 
 var (
@@ -1073,29 +1264,32 @@ func file_app_router_config_proto_rawDescGZIP() []byte {
 }
 
 var file_app_router_config_proto_enumTypes = make([]protoimpl.EnumInfo, 2)
-var file_app_router_config_proto_msgTypes = make([]protoimpl.MessageInfo, 11)
+var file_app_router_config_proto_msgTypes = make([]protoimpl.MessageInfo, 13)
 var file_app_router_config_proto_goTypes = []interface{}{
-	(Domain_Type)(0),           // 0: xray.app.router.Domain.Type
-	(Config_DomainStrategy)(0), // 1: xray.app.router.Config.DomainStrategy
-	(*Domain)(nil),             // 2: xray.app.router.Domain
-	(*CIDR)(nil),               // 3: xray.app.router.CIDR
-	(*GeoIP)(nil),              // 4: xray.app.router.GeoIP
-	(*GeoIPList)(nil),          // 5: xray.app.router.GeoIPList
-	(*GeoSite)(nil),            // 6: xray.app.router.GeoSite
-	(*GeoSiteList)(nil),        // 7: xray.app.router.GeoSiteList
-	(*RoutingRule)(nil),        // 8: xray.app.router.RoutingRule
-	(*BalancingRule)(nil),      // 9: xray.app.router.BalancingRule
-	(*Config)(nil),             // 10: xray.app.router.Config
-	(*Domain_Attribute)(nil),   // 11: xray.app.router.Domain.Attribute
-	nil,                        // 12: xray.app.router.RoutingRule.AttributesEntry
-	(*net.PortRange)(nil),      // 13: xray.common.net.PortRange
-	(*net.PortList)(nil),       // 14: xray.common.net.PortList
-	(*net.NetworkList)(nil),    // 15: xray.common.net.NetworkList
-	(net.Network)(0),           // 16: xray.common.net.Network
+	(Domain_Type)(0),                // 0: xray.app.router.Domain.Type
+	(Config_DomainStrategy)(0),      // 1: xray.app.router.Config.DomainStrategy
+	(*Domain)(nil),                  // 2: xray.app.router.Domain
+	(*CIDR)(nil),                    // 3: xray.app.router.CIDR
+	(*GeoIP)(nil),                   // 4: xray.app.router.GeoIP
+	(*GeoIPList)(nil),               // 5: xray.app.router.GeoIPList
+	(*GeoSite)(nil),                 // 6: xray.app.router.GeoSite
+	(*GeoSiteList)(nil),             // 7: xray.app.router.GeoSiteList
+	(*RoutingRule)(nil),             // 8: xray.app.router.RoutingRule
+	(*BalancingRule)(nil),           // 9: xray.app.router.BalancingRule
+	(*StrategyWeight)(nil),          // 10: xray.app.router.StrategyWeight
+	(*StrategyLeastLoadConfig)(nil), // 11: xray.app.router.StrategyLeastLoadConfig
+	(*Config)(nil),                  // 12: xray.app.router.Config
+	(*Domain_Attribute)(nil),        // 13: xray.app.router.Domain.Attribute
+	nil,                             // 14: xray.app.router.RoutingRule.AttributesEntry
+	(*net.PortRange)(nil),           // 15: xray.common.net.PortRange
+	(*net.PortList)(nil),            // 16: xray.common.net.PortList
+	(*net.NetworkList)(nil),         // 17: xray.common.net.NetworkList
+	(net.Network)(0),                // 18: xray.common.net.Network
+	(*serial.TypedMessage)(nil),     // 19: xray.common.serial.TypedMessage
 }
 var file_app_router_config_proto_depIdxs = []int32{
 	0,  // 0: xray.app.router.Domain.type:type_name -> xray.app.router.Domain.Type
-	11, // 1: xray.app.router.Domain.attribute:type_name -> xray.app.router.Domain.Attribute
+	13, // 1: xray.app.router.Domain.attribute:type_name -> xray.app.router.Domain.Attribute
 	3,  // 2: xray.app.router.GeoIP.cidr:type_name -> xray.app.router.CIDR
 	4,  // 3: xray.app.router.GeoIPList.entry:type_name -> xray.app.router.GeoIP
 	2,  // 4: xray.app.router.GeoSite.domain:type_name -> xray.app.router.Domain
@@ -1103,22 +1297,24 @@ var file_app_router_config_proto_depIdxs = []int32{
 	2,  // 6: xray.app.router.RoutingRule.domain:type_name -> xray.app.router.Domain
 	3,  // 7: xray.app.router.RoutingRule.cidr:type_name -> xray.app.router.CIDR
 	4,  // 8: xray.app.router.RoutingRule.geoip:type_name -> xray.app.router.GeoIP
-	13, // 9: xray.app.router.RoutingRule.port_range:type_name -> xray.common.net.PortRange
-	14, // 10: xray.app.router.RoutingRule.port_list:type_name -> xray.common.net.PortList
-	15, // 11: xray.app.router.RoutingRule.network_list:type_name -> xray.common.net.NetworkList
-	16, // 12: xray.app.router.RoutingRule.networks:type_name -> xray.common.net.Network
+	15, // 9: xray.app.router.RoutingRule.port_range:type_name -> xray.common.net.PortRange
+	16, // 10: xray.app.router.RoutingRule.port_list:type_name -> xray.common.net.PortList
+	17, // 11: xray.app.router.RoutingRule.network_list:type_name -> xray.common.net.NetworkList
+	18, // 12: xray.app.router.RoutingRule.networks:type_name -> xray.common.net.Network
 	3,  // 13: xray.app.router.RoutingRule.source_cidr:type_name -> xray.app.router.CIDR
 	4,  // 14: xray.app.router.RoutingRule.source_geoip:type_name -> xray.app.router.GeoIP
-	14, // 15: xray.app.router.RoutingRule.source_port_list:type_name -> xray.common.net.PortList
-	12, // 16: xray.app.router.RoutingRule.attributes:type_name -> xray.app.router.RoutingRule.AttributesEntry
-	1,  // 17: xray.app.router.Config.domain_strategy:type_name -> xray.app.router.Config.DomainStrategy
-	8,  // 18: xray.app.router.Config.rule:type_name -> xray.app.router.RoutingRule
-	9,  // 19: xray.app.router.Config.balancing_rule:type_name -> xray.app.router.BalancingRule
-	20, // [20:20] is the sub-list for method output_type
-	20, // [20:20] is the sub-list for method input_type
-	20, // [20:20] is the sub-list for extension type_name
-	20, // [20:20] is the sub-list for extension extendee
-	0,  // [0:20] is the sub-list for field type_name
+	16, // 15: xray.app.router.RoutingRule.source_port_list:type_name -> xray.common.net.PortList
+	14, // 16: xray.app.router.RoutingRule.attributes:type_name -> xray.app.router.RoutingRule.AttributesEntry
+	19, // 17: xray.app.router.BalancingRule.strategy_settings:type_name -> xray.common.serial.TypedMessage
+	10, // 18: xray.app.router.StrategyLeastLoadConfig.costs:type_name -> xray.app.router.StrategyWeight
+	1,  // 19: xray.app.router.Config.domain_strategy:type_name -> xray.app.router.Config.DomainStrategy
+	8,  // 20: xray.app.router.Config.rule:type_name -> xray.app.router.RoutingRule
+	9,  // 21: xray.app.router.Config.balancing_rule:type_name -> xray.app.router.BalancingRule
+	22, // [22:22] is the sub-list for method output_type
+	22, // [22:22] is the sub-list for method input_type
+	22, // [22:22] is the sub-list for extension type_name
+	22, // [22:22] is the sub-list for extension extendee
+	0,  // [0:22] is the sub-list for field type_name
 }
 
 func init() { file_app_router_config_proto_init() }
@@ -1224,7 +1420,7 @@ func file_app_router_config_proto_init() {
 			}
 		}
 		file_app_router_config_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*Config); i {
+			switch v := v.(*StrategyWeight); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -1236,6 +1432,30 @@ func file_app_router_config_proto_init() {
 			}
 		}
 		file_app_router_config_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*StrategyLeastLoadConfig); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_router_config_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Config); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_app_router_config_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*Domain_Attribute); i {
 			case 0:
 				return &v.state
@@ -1252,7 +1472,7 @@ func file_app_router_config_proto_init() {
 		(*RoutingRule_Tag)(nil),
 		(*RoutingRule_BalancingTag)(nil),
 	}
-	file_app_router_config_proto_msgTypes[9].OneofWrappers = []interface{}{
+	file_app_router_config_proto_msgTypes[11].OneofWrappers = []interface{}{
 		(*Domain_Attribute_BoolValue)(nil),
 		(*Domain_Attribute_IntValue)(nil),
 	}
@@ -1262,7 +1482,7 @@ func file_app_router_config_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_app_router_config_proto_rawDesc,
 			NumEnums:      2,
-			NumMessages:   11,
+			NumMessages:   13,
 			NumExtensions: 0,
 			NumServices:   0,
 		},

app/router/config.proto

@@ -6,6 +6,7 @@ option go_package = "github.com/xtls/xray-core/app/router";
 option java_package = "com.xray.app.router";
 option java_multiple_files = true;
 
+import "common/serial/typed_message.proto";
 import "common/net/port.proto";
 import "common/net/network.proto";
 
@@ -128,6 +129,27 @@ message BalancingRule {
   string tag = 1;
   repeated string outbound_selector = 2;
   string strategy = 3;
+  xray.common.serial.TypedMessage strategy_settings = 4;
+  string fallback_tag = 5;
+}
+
+message StrategyWeight {
+  bool regexp = 1;
+  string match = 2;
+  float value =3;
+}
+
+message StrategyLeastLoadConfig {
+  // weight settings
+  repeated StrategyWeight costs = 2;
+  // RTT baselines for selecting, int64 values of time.Duration
+  repeated int64 baselines = 3;
+  // expected nodes count to select
+  int32 expected = 4;
+  // max acceptable rtt, filter away high delay nodes. defalut 0
+  int64 maxRTT = 5;
+  // acceptable failure rate
+  float tolerance = 6;
 }
 
 message Config {

app/router/router.go

@@ -29,13 +29,13 @@ type Route struct {
 }
 
 // Init initializes the Router.
-func (r *Router) Init(ctx context.Context, config *Config, d dns.Client, ohm outbound.Manager) error {
+func (r *Router) Init(ctx context.Context, config *Config, d dns.Client, ohm outbound.Manager, dispatcher routing.Dispatcher) error {
 	r.domainStrategy = config.DomainStrategy
 	r.dns = d
 
 	r.balancers = make(map[string]*Balancer, len(config.BalancingRule))
 	for _, rule := range config.BalancingRule {
-		balancer, err := rule.Build(ohm)
+		balancer, err := rule.Build(ohm, dispatcher)
 		if err != nil {
 			return err
 		}
@@ -113,12 +113,12 @@ func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context,
 }
 
 // Start implements common.Runnable.
-func (*Router) Start() error {
+func (r *Router) Start() error {
 	return nil
 }
 
 // Close implements common.Closable.
-func (*Router) Close() error {
+func (r *Router) Close() error {
 	return nil
 }
 
@@ -140,8 +140,8 @@ func (r *Route) GetOutboundTag() string {
 func init() {
 	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
 		r := new(Router)
-		if err := core.RequireFeatures(ctx, func(d dns.Client, ohm outbound.Manager) error {
-			return r.Init(ctx, config.(*Config), d, ohm)
+		if err := core.RequireFeatures(ctx, func(d dns.Client, ohm outbound.Manager, dispatcher routing.Dispatcher) error {
+			return r.Init(ctx, config.(*Config), d, ohm, dispatcher)
 		}); err != nil {
 			return nil, err
 		}

app/router/router_test.go

@@ -43,7 +43,7 @@ func TestSimpleRouter(t *testing.T) {
 	common.Must(r.Init(context.TODO(), config, mockDNS, &mockOutboundManager{
 		Manager:         mockOhm,
 		HandlerSelector: mockHs,
-	}))
+	}, nil))
 
 	ctx := session.ContextWithOutbound(context.Background(), &session.Outbound{Target: net.TCPDestination(net.DomainAddress("example.com"), 80)})
 	route, err := r.PickRoute(routing_session.AsRoutingContext(ctx))
@@ -84,7 +84,7 @@ func TestSimpleBalancer(t *testing.T) {
 	common.Must(r.Init(context.TODO(), config, mockDNS, &mockOutboundManager{
 		Manager:         mockOhm,
 		HandlerSelector: mockHs,
-	}))
+	}, nil))
 
 	ctx := session.ContextWithOutbound(context.Background(), &session.Outbound{Target: net.TCPDestination(net.DomainAddress("example.com"), 80)})
 	route, err := r.PickRoute(routing_session.AsRoutingContext(ctx))
@@ -94,6 +94,55 @@ func TestSimpleBalancer(t *testing.T) {
 	}
 }
 
+/*
+
+Do not work right now: need a full client setup
+
+func TestLeastLoadBalancer(t *testing.T) {
+	config := &Config{
+		Rule: []*RoutingRule{
+			{
+				TargetTag: &RoutingRule_BalancingTag{
+					BalancingTag: "balance",
+				},
+				Networks: []net.Network{net.Network_TCP},
+			},
+		},
+		BalancingRule: []*BalancingRule{
+			{
+				Tag:              "balance",
+				OutboundSelector: []string{"test-"},
+				Strategy:         "leastLoad",
+				StrategySettings: serial.ToTypedMessage(&StrategyLeastLoadConfig{
+					Baselines:   nil,
+					Expected:    1,
+				}),
+			},
+		},
+	}
+
+	mockCtl := gomock.NewController(t)
+	defer mockCtl.Finish()
+
+	mockDNS := mocks.NewDNSClient(mockCtl)
+	mockOhm := mocks.NewOutboundManager(mockCtl)
+	mockHs := mocks.NewOutboundHandlerSelector(mockCtl)
+
+	mockHs.EXPECT().Select(gomock.Eq([]string{"test-"})).Return([]string{"test1"})
+
+	r := new(Router)
+	common.Must(r.Init(context.TODO(), config, mockDNS, &mockOutboundManager{
+		Manager:         mockOhm,
+		HandlerSelector: mockHs,
+	}, nil))
+	ctx := session.ContextWithOutbound(context.Background(), &session.Outbound{Target: net.TCPDestination(net.DomainAddress("v2ray.com"), 80)})
+	route, err := r.PickRoute(routing_session.AsRoutingContext(ctx))
+	common.Must(err)
+	if tag := route.GetOutboundTag(); tag != "test1" {
+		t.Error("expect tag 'test1', bug actually ", tag)
+	}
+}*/
+
 func TestIPOnDemand(t *testing.T) {
 	config := &Config{
 		DomainStrategy: Config_IpOnDemand,
@@ -123,7 +172,7 @@ func TestIPOnDemand(t *testing.T) {
 	}).Return([]net.IP{{192, 168, 0, 1}}, nil).AnyTimes()
 
 	r := new(Router)
-	common.Must(r.Init(context.TODO(), config, mockDNS, nil))
+	common.Must(r.Init(context.TODO(), config, mockDNS, nil, nil))
 
 	ctx := session.ContextWithOutbound(context.Background(), &session.Outbound{Target: net.TCPDestination(net.DomainAddress("example.com"), 80)})
 	route, err := r.PickRoute(routing_session.AsRoutingContext(ctx))
@@ -162,7 +211,7 @@ func TestIPIfNonMatchDomain(t *testing.T) {
 	}).Return([]net.IP{{192, 168, 0, 1}}, nil).AnyTimes()
 
 	r := new(Router)
-	common.Must(r.Init(context.TODO(), config, mockDNS, nil))
+	common.Must(r.Init(context.TODO(), config, mockDNS, nil, nil))
 
 	ctx := session.ContextWithOutbound(context.Background(), &session.Outbound{Target: net.TCPDestination(net.DomainAddress("example.com"), 80)})
 	route, err := r.PickRoute(routing_session.AsRoutingContext(ctx))
@@ -196,7 +245,7 @@ func TestIPIfNonMatchIP(t *testing.T) {
 	mockDNS := mocks.NewDNSClient(mockCtl)
 
 	r := new(Router)
-	common.Must(r.Init(context.TODO(), config, mockDNS, nil))
+	common.Must(r.Init(context.TODO(), config, mockDNS, nil, nil))
 
 	ctx := session.ContextWithOutbound(context.Background(), &session.Outbound{Target: net.TCPDestination(net.LocalHostIP, 80)})
 	route, err := r.PickRoute(routing_session.AsRoutingContext(ctx))

app/router/strategy_leastload.go

@@ -0,0 +1,200 @@
+package router
+
+import (
+	"context"
+	"math"
+	"sort"
+	"time"
+
+	"github.com/xtls/xray-core/app/observatory"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/dice"
+	"github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features/extension"
+)
+
+// LeastLoadStrategy represents a least load balancing strategy
+type LeastLoadStrategy struct {
+	settings *StrategyLeastLoadConfig
+	costs    *WeightManager
+
+	observer extension.Observatory
+
+	ctx context.Context
+}
+
+func (l *LeastLoadStrategy) GetPrincipleTarget(strings []string) []string {
+	var ret []string
+	nodes := l.pickOutbounds(strings)
+	for _, v := range nodes {
+		ret = append(ret, v.Tag)
+	}
+	return ret
+}
+
+// NewLeastLoadStrategy creates a new LeastLoadStrategy with settings
+func NewLeastLoadStrategy(settings *StrategyLeastLoadConfig) *LeastLoadStrategy {
+	return &LeastLoadStrategy{
+		settings: settings,
+		costs: NewWeightManager(
+			settings.Costs, 1,
+			func(value, cost float64) float64 {
+				return value * math.Pow(cost, 0.5)
+			},
+		),
+	}
+}
+
+// node is a minimal copy of HealthCheckResult
+// we don't use HealthCheckResult directly because
+// it may change by health checker during routing
+type node struct {
+	Tag              string
+	CountAll         int
+	CountFail        int
+	RTTAverage       time.Duration
+	RTTDeviation     time.Duration
+	RTTDeviationCost time.Duration
+}
+
+func (l *LeastLoadStrategy) InjectContext(ctx context.Context) {
+	l.ctx = ctx
+}
+
+func (s *LeastLoadStrategy) PickOutbound(candidates []string) string {
+	selects := s.pickOutbounds(candidates)
+	count := len(selects)
+	if count == 0 {
+		// goes to fallbackTag
+		return ""
+	}
+	return selects[dice.Roll(count)].Tag
+}
+
+func (s *LeastLoadStrategy) pickOutbounds(candidates []string) []*node {
+	qualified := s.getNodes(candidates, time.Duration(s.settings.MaxRTT))
+	selects := s.selectLeastLoad(qualified)
+	return selects
+}
+
+// selectLeastLoad selects nodes according to Baselines and Expected Count.
+//
+// The strategy always improves network response speed, not matter which mode below is configured.
+// But they can still have different priorities.
+//
+// 1. Bandwidth priority: no Baseline + Expected Count > 0.: selects `Expected Count` of nodes.
+// (one if Expected Count <= 0)
+//
+// 2. Bandwidth priority advanced: Baselines + Expected Count > 0.
+// Select `Expected Count` amount of nodes, and also those near them according to baselines.
+// In other words, it selects according to different Baselines, until one of them matches
+// the Expected Count, if no Baseline matches, Expected Count applied.
+//
+// 3. Speed priority: Baselines + `Expected Count <= 0`.
+// go through all baselines until find selects, if not, select none. Used in combination
+// with 'balancer.fallbackTag', it means: selects qualified nodes or use the fallback.
+func (s *LeastLoadStrategy) selectLeastLoad(nodes []*node) []*node {
+	if len(nodes) == 0 {
+		newError("least load: no qualified outbound").AtInfo().WriteToLog()
+		return nil
+	}
+	expected := int(s.settings.Expected)
+	availableCount := len(nodes)
+	if expected > availableCount {
+		return nodes
+	}
+
+	if expected <= 0 {
+		expected = 1
+	}
+	if len(s.settings.Baselines) == 0 {
+		return nodes[:expected]
+	}
+
+	count := 0
+	// go through all base line until find expected selects
+	for _, b := range s.settings.Baselines {
+		baseline := time.Duration(b)
+		for i := count; i < availableCount; i++ {
+			if nodes[i].RTTDeviationCost >= baseline {
+				break
+			}
+			count = i + 1
+		}
+		// don't continue if find expected selects
+		if count >= expected {
+			newError("applied baseline: ", baseline).AtDebug().WriteToLog()
+			break
+		}
+	}
+	if s.settings.Expected > 0 && count < expected {
+		count = expected
+	}
+	return nodes[:count]
+}
+
+func (s *LeastLoadStrategy) getNodes(candidates []string, maxRTT time.Duration) []*node {
+	if s.observer == nil {
+		common.Must(core.RequireFeatures(s.ctx, func(observatory extension.Observatory) error {
+			s.observer = observatory
+			return nil
+		}))
+	}
+	observeResult, err := s.observer.GetObservation(s.ctx)
+	if err != nil {
+		newError("cannot get observation").Base(err).WriteToLog()
+		return make([]*node, 0)
+	}
+
+	results := observeResult.(*observatory.ObservationResult)
+
+	outboundlist := outboundList(candidates)
+
+	var ret []*node
+
+	for _, v := range results.Status {
+		if v.Alive && (v.Delay < maxRTT.Milliseconds() || maxRTT == 0) && outboundlist.contains(v.OutboundTag) {
+			record := &node{
+				Tag:              v.OutboundTag,
+				CountAll:         1,
+				CountFail:        1,
+				RTTAverage:       time.Duration(v.Delay) * time.Millisecond,
+				RTTDeviation:     time.Duration(v.Delay) * time.Millisecond,
+				RTTDeviationCost: time.Duration(s.costs.Apply(v.OutboundTag, float64(time.Duration(v.Delay)*time.Millisecond))),
+			}
+
+			if v.HealthPing != nil {
+				record.RTTAverage = time.Duration(v.HealthPing.Average)
+				record.RTTDeviation = time.Duration(v.HealthPing.Deviation)
+				record.RTTDeviationCost = time.Duration(s.costs.Apply(v.OutboundTag, float64(v.HealthPing.Deviation)))
+				record.CountAll = int(v.HealthPing.All)
+				record.CountFail = int(v.HealthPing.Fail)
+
+			}
+			ret = append(ret, record)
+		}
+	}
+
+	leastloadSort(ret)
+	return ret
+}
+
+func leastloadSort(nodes []*node) {
+	sort.Slice(nodes, func(i, j int) bool {
+		left := nodes[i]
+		right := nodes[j]
+		if left.RTTDeviationCost != right.RTTDeviationCost {
+			return left.RTTDeviationCost < right.RTTDeviationCost
+		}
+		if left.RTTAverage != right.RTTAverage {
+			return left.RTTAverage < right.RTTAverage
+		}
+		if left.CountFail != right.CountFail {
+			return left.CountFail < right.CountFail
+		}
+		if left.CountAll != right.CountAll {
+			return left.CountAll > right.CountAll
+		}
+		return left.Tag < right.Tag
+	})
+}

app/router/strategy_leastload_test.go

@@ -0,0 +1,179 @@
+package router
+
+import (
+	"testing"
+)
+
+/*
+Split into multiple package, need to be tested separately
+
+func TestSelectLeastLoad(t *testing.T) {
+	settings := &StrategyLeastLoadConfig{
+		HealthCheck: &HealthPingConfig{
+			SamplingCount: 10,
+		},
+		Expected: 1,
+		MaxRTT:   int64(time.Millisecond * time.Duration(800)),
+	}
+	strategy := NewLeastLoadStrategy(settings)
+	// std 40
+	strategy.PutResult("a", time.Millisecond*time.Duration(60))
+	strategy.PutResult("a", time.Millisecond*time.Duration(140))
+	strategy.PutResult("a", time.Millisecond*time.Duration(60))
+	strategy.PutResult("a", time.Millisecond*time.Duration(140))
+	// std 60
+	strategy.PutResult("b", time.Millisecond*time.Duration(40))
+	strategy.PutResult("b", time.Millisecond*time.Duration(160))
+	strategy.PutResult("b", time.Millisecond*time.Duration(40))
+	strategy.PutResult("b", time.Millisecond*time.Duration(160))
+	// std 0, but >MaxRTT
+	strategy.PutResult("c", time.Millisecond*time.Duration(1000))
+	strategy.PutResult("c", time.Millisecond*time.Duration(1000))
+	strategy.PutResult("c", time.Millisecond*time.Duration(1000))
+	strategy.PutResult("c", time.Millisecond*time.Duration(1000))
+	expected := "a"
+	actual := strategy.SelectAndPick([]string{"a", "b", "c", "untested"})
+	if actual != expected {
+		t.Errorf("expected: %v, actual: %v", expected, actual)
+	}
+}
+
+func TestSelectLeastLoadWithCost(t *testing.T) {
+	settings := &StrategyLeastLoadConfig{
+		HealthCheck: &HealthPingConfig{
+			SamplingCount: 10,
+		},
+		Costs: []*StrategyWeight{
+			{Match: "a", Value: 9},
+		},
+		Expected: 1,
+	}
+	strategy := NewLeastLoadStrategy(settings, nil)
+	// std 40, std+c 120
+	strategy.PutResult("a", time.Millisecond*time.Duration(60))
+	strategy.PutResult("a", time.Millisecond*time.Duration(140))
+	strategy.PutResult("a", time.Millisecond*time.Duration(60))
+	strategy.PutResult("a", time.Millisecond*time.Duration(140))
+	// std 60
+	strategy.PutResult("b", time.Millisecond*time.Duration(40))
+	strategy.PutResult("b", time.Millisecond*time.Duration(160))
+	strategy.PutResult("b", time.Millisecond*time.Duration(40))
+	strategy.PutResult("b", time.Millisecond*time.Duration(160))
+	expected := "b"
+	actual := strategy.SelectAndPick([]string{"a", "b", "untested"})
+	if actual != expected {
+		t.Errorf("expected: %v, actual: %v", expected, actual)
+	}
+}
+*/
+func TestSelectLeastExpected(t *testing.T) {
+	strategy := &LeastLoadStrategy{
+		settings: &StrategyLeastLoadConfig{
+			Baselines: nil,
+			Expected:  3,
+		},
+	}
+	nodes := []*node{
+		{Tag: "a", RTTDeviationCost: 100},
+		{Tag: "b", RTTDeviationCost: 200},
+		{Tag: "c", RTTDeviationCost: 300},
+		{Tag: "d", RTTDeviationCost: 350},
+	}
+	expected := 3
+	ns := strategy.selectLeastLoad(nodes)
+	if len(ns) != expected {
+		t.Errorf("expected: %v, actual: %v", expected, len(ns))
+	}
+}
+func TestSelectLeastExpected2(t *testing.T) {
+	strategy := &LeastLoadStrategy{
+		settings: &StrategyLeastLoadConfig{
+			Baselines: nil,
+			Expected:  3,
+		},
+	}
+	nodes := []*node{
+		{Tag: "a", RTTDeviationCost: 100},
+		{Tag: "b", RTTDeviationCost: 200},
+	}
+	expected := 2
+	ns := strategy.selectLeastLoad(nodes)
+	if len(ns) != expected {
+		t.Errorf("expected: %v, actual: %v", expected, len(ns))
+	}
+}
+func TestSelectLeastExpectedAndBaselines(t *testing.T) {
+	strategy := &LeastLoadStrategy{
+		settings: &StrategyLeastLoadConfig{
+			Baselines: []int64{200, 300, 400},
+			Expected:  3,
+		},
+	}
+	nodes := []*node{
+		{Tag: "a", RTTDeviationCost: 100},
+		{Tag: "b", RTTDeviationCost: 200},
+		{Tag: "c", RTTDeviationCost: 250},
+		{Tag: "d", RTTDeviationCost: 300},
+		{Tag: "e", RTTDeviationCost: 310},
+	}
+	expected := 3
+	ns := strategy.selectLeastLoad(nodes)
+	if len(ns) != expected {
+		t.Errorf("expected: %v, actual: %v", expected, len(ns))
+	}
+}
+func TestSelectLeastExpectedAndBaselines2(t *testing.T) {
+	strategy := &LeastLoadStrategy{
+		settings: &StrategyLeastLoadConfig{
+			Baselines: []int64{200, 300, 400},
+			Expected:  3,
+		},
+	}
+	nodes := []*node{
+		{Tag: "a", RTTDeviationCost: 500},
+		{Tag: "b", RTTDeviationCost: 600},
+		{Tag: "c", RTTDeviationCost: 700},
+		{Tag: "d", RTTDeviationCost: 800},
+		{Tag: "e", RTTDeviationCost: 900},
+	}
+	expected := 3
+	ns := strategy.selectLeastLoad(nodes)
+	if len(ns) != expected {
+		t.Errorf("expected: %v, actual: %v", expected, len(ns))
+	}
+}
+func TestSelectLeastLoadBaselines(t *testing.T) {
+	strategy := &LeastLoadStrategy{
+		settings: &StrategyLeastLoadConfig{
+			Baselines: []int64{200, 400, 600},
+			Expected:  0,
+		},
+	}
+	nodes := []*node{
+		{Tag: "a", RTTDeviationCost: 100},
+		{Tag: "b", RTTDeviationCost: 200},
+		{Tag: "c", RTTDeviationCost: 300},
+	}
+	expected := 1
+	ns := strategy.selectLeastLoad(nodes)
+	if len(ns) != expected {
+		t.Errorf("expected: %v, actual: %v", expected, len(ns))
+	}
+}
+func TestSelectLeastLoadBaselinesNoQualified(t *testing.T) {
+	strategy := &LeastLoadStrategy{
+		settings: &StrategyLeastLoadConfig{
+			Baselines: []int64{200, 400, 600},
+			Expected:  0,
+		},
+	}
+	nodes := []*node{
+		{Tag: "a", RTTDeviationCost: 800},
+		{Tag: "b", RTTDeviationCost: 1000},
+	}
+	expected := 0
+	ns := strategy.selectLeastLoad(nodes)
+	if len(ns) != expected {
+		t.Errorf("expected: %v, actual: %v", expected, len(ns))
+	}
+}

app/router/strategy_leastping.go

@@ -14,6 +14,10 @@ type LeastPingStrategy struct {
 	observatory extension.Observatory
 }
 
+func (l *LeastPingStrategy) GetPrincipleTarget(strings []string) []string {
+	return []string{l.PickOutbound(strings)}
+}
+
 func (l *LeastPingStrategy) InjectContext(ctx context.Context) {
 	l.ctx = ctx
 }

app/router/strategy_random.go

@@ -0,0 +1,21 @@
+package router
+
+import (
+	"github.com/xtls/xray-core/common/dice"
+)
+
+// RandomStrategy represents a random balancing strategy
+type RandomStrategy struct{}
+
+func (s *RandomStrategy) GetPrincipleTarget(strings []string) []string {
+	return strings
+}
+
+func (s *RandomStrategy) PickOutbound(candidates []string) string {
+	count := len(candidates)
+	if count == 0 {
+		// goes to fallbackTag
+		return ""
+	}
+	return candidates[dice.Roll(count)]
+}

app/router/weight.go

@@ -0,0 +1,89 @@
+package router
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+	"sync"
+)
+
+type weightScaler func(value, weight float64) float64
+
+var numberFinder = regexp.MustCompile(`\d+(\.\d+)?`)
+
+// NewWeightManager creates a new WeightManager with settings
+func NewWeightManager(s []*StrategyWeight, defaultWeight float64, scaler weightScaler) *WeightManager {
+	return &WeightManager{
+		settings:      s,
+		cache:         make(map[string]float64),
+		scaler:        scaler,
+		defaultWeight: defaultWeight,
+	}
+}
+
+// WeightManager manages weights for specific settings
+type WeightManager struct {
+	settings      []*StrategyWeight
+	cache         map[string]float64
+	scaler        weightScaler
+	defaultWeight float64
+	mu            sync.Mutex
+}
+
+// Get get the weight of specified tag
+func (s *WeightManager) Get(tag string) float64 {
+	s.mu.Lock()
+	defer s.mu.Unlock()
+	weight, ok := s.cache[tag]
+	if ok {
+		return weight
+	}
+	weight = s.findValue(tag)
+	s.cache[tag] = weight
+	return weight
+}
+
+// Apply applies weight to the value
+func (s *WeightManager) Apply(tag string, value float64) float64 {
+	return s.scaler(value, s.Get(tag))
+}
+
+func (s *WeightManager) findValue(tag string) float64 {
+	for _, w := range s.settings {
+		matched := s.getMatch(tag, w.Match, w.Regexp)
+		if matched == "" {
+			continue
+		}
+		if w.Value > 0 {
+			return float64(w.Value)
+		}
+		// auto weight from matched
+		numStr := numberFinder.FindString(matched)
+		if numStr == "" {
+			return s.defaultWeight
+		}
+		weight, err := strconv.ParseFloat(numStr, 64)
+		if err != nil {
+			newError("unexpected error from ParseFloat: ", err).AtError().WriteToLog()
+			return s.defaultWeight
+		}
+		return weight
+	}
+	return s.defaultWeight
+}
+
+func (s *WeightManager) getMatch(tag, find string, isRegexp bool) string {
+	if !isRegexp {
+		idx := strings.Index(tag, find)
+		if idx < 0 {
+			return ""
+		}
+		return find
+	}
+	r, err := regexp.Compile(find)
+	if err != nil {
+		newError("invalid regexp: ", find, "err: ", err).AtError().WriteToLog()
+		return ""
+	}
+	return r.FindString(tag)
+}

app/router/weight_test.go

@@ -0,0 +1,60 @@
+package router_test
+
+import (
+	"reflect"
+	"testing"
+
+	"github.com/xtls/xray-core/app/router"
+)
+
+func TestWeight(t *testing.T) {
+	manager := router.NewWeightManager(
+		[]*router.StrategyWeight{
+			{
+				Match: "x5",
+				Value: 100,
+			},
+			{
+				Match: "x8",
+			},
+			{
+				Regexp: true,
+				Match:  `\bx0+(\.\d+)?\b`,
+				Value:  1,
+			},
+			{
+				Regexp: true,
+				Match:  `\bx\d+(\.\d+)?\b`,
+			},
+		},
+		1, func(v, w float64) float64 {
+			return v * w
+		},
+	)
+	tags := []string{
+		"node name, x5, and more",
+		"node name, x8",
+		"node name, x15",
+		"node name, x0100, and more",
+		"node name, x10.1",
+		"node name, x00.1, and more",
+	}
+	// test weight
+	expected := []float64{100, 8, 15, 100, 10.1, 1}
+	actual := make([]float64, 0)
+	for _, tag := range tags {
+		actual = append(actual, manager.Get(tag))
+	}
+	if !reflect.DeepEqual(expected, actual) {
+		t.Errorf("expected: %v, actual: %v", expected, actual)
+	}
+	// test scale
+	expected2 := []float64{1000, 80, 150, 1000, 101, 10}
+	actual2 := make([]float64, 0)
+	for _, tag := range tags {
+		actual2 = append(actual2, manager.Apply(tag, 10))
+	}
+	if !reflect.DeepEqual(expected2, actual2) {
+		t.Errorf("expected2: %v, actual2: %v", expected2, actual2)
+	}
+}

app/stats/command/command.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/stats/command/command.proto
 

app/stats/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: app/stats/config.proto
 

common/buf/copy.go

@@ -6,6 +6,7 @@ import (
 
 	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/signal"
+	"github.com/xtls/xray-core/features/stats"
 )
 
 type dataHandler func(MultiBuffer)
@@ -40,6 +41,17 @@ func CountSize(sc *SizeCounter) CopyOption {
 	}
 }
 
+// AddToStatCounter a CopyOption add to stat counter
+func AddToStatCounter(sc stats.Counter) CopyOption {
+	return func(handler *copyHandler) {
+		handler.onData = append(handler.onData, func(b MultiBuffer) {
+			if sc != nil {
+				sc.Add(int64(b.Len()))
+			}
+		})
+	}
+}
+
 type readError struct {
 	error
 }

common/buf/readv_reader.go

@@ -147,7 +147,7 @@ var useReadv bool
 
 func init() {
 	const defaultFlagValue = "NOT_DEFINED_AT_ALL"
-	value := platform.NewEnvFlag("xray.buf.readv").GetValue(func() string { return defaultFlagValue })
+	value := platform.NewEnvFlag(platform.UseReadV).GetValue(func() string { return defaultFlagValue })
 	switch value {
 	case defaultFlagValue, "auto", "enable":
 		useReadv = true

common/crypto/auth.go

@@ -178,7 +178,7 @@ func (r *AuthenticationReader) readInternal(soft bool, mb *buf.MultiBuffer) erro
 	if size <= buf.Size {
 		b, err := r.readBuffer(int32(size), int32(padding))
 		if err != nil {
-			return nil
+			return err
 		}
 		*mb = append(*mb, b)
 		return nil

common/dice/dice.go

@@ -4,7 +4,6 @@ package dice // import "github.com/xtls/xray-core/common/dice"
 
 import (
 	"math/rand"
-	"time"
 )
 
 // Roll returns a non-negative number between 0 (inclusive) and n (exclusive).
@@ -46,7 +45,3 @@ func (dd *DeterministicDice) Roll(n int) int {
 	}
 	return dd.Intn(n)
 }
-
-func init() {
-	rand.Seed(time.Now().Unix())
-}

common/drain/drainer.go

@@ -2,7 +2,6 @@ package drain
 
 import (
 	"io"
-	"io/ioutil"
 
 	"github.com/xtls/xray-core/common/dice"
 )
@@ -36,7 +35,7 @@ func (d *BehaviorSeedLimitedDrainer) Drain(reader io.Reader) error {
 }
 
 func drainReadN(reader io.Reader, n int) error {
-	_, err := io.CopyN(ioutil.Discard, reader, int64(n))
+	_, err := io.CopyN(io.Discard, reader, int64(n))
 	return err
 }
 

common/log/log.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: common/log/log.proto
 

common/log/logger.go

@@ -27,6 +27,11 @@ type generalLogger struct {
 	done    *done.Instance
 }
 
+type serverityLogger struct {
+	inner    *generalLogger
+	logLevel Severity
+}
+
 // NewLogger returns a generic log handler that can handle all type of messages.
 func NewLogger(logWriterCreator WriterCreator) Handler {
 	return &generalLogger{
@@ -37,6 +42,32 @@ func NewLogger(logWriterCreator WriterCreator) Handler {
 	}
 }
 
+func ReplaceWithSeverityLogger(serverity Severity) {
+	w := CreateStdoutLogWriter()
+	g := &generalLogger{
+		creator: w,
+		buffer:  make(chan Message, 16),
+		access:  semaphore.New(1),
+		done:    done.New(),
+	}
+	s := &serverityLogger{
+		inner:    g,
+		logLevel: serverity,
+	}
+	RegisterHandler(s)
+}
+
+func (l *serverityLogger) Handle(msg Message) {
+	switch msg := msg.(type) {
+	case *GeneralMessage:
+		if msg.Severity <= l.logLevel {
+			l.inner.Handle(msg)
+		}
+	default:
+		l.inner.Handle(msg)
+	}
+}
+
 func (l *generalLogger) run() {
 	defer l.access.Signal()
 
@@ -67,6 +98,7 @@ func (l *generalLogger) run() {
 }
 
 func (l *generalLogger) Handle(msg Message) {
+
 	select {
 	case l.buffer <- msg:
 	default:

common/net/address.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: common/net/address.proto
 

common/net/destination.go

@@ -97,6 +97,35 @@ func (d Destination) NetAddr() string {
 	return addr
 }
 
+// RawNetAddr converts a net.Addr from its Destination presentation.
+func (d Destination) RawNetAddr() net.Addr {
+	var addr net.Addr
+	switch d.Network {
+	case Network_TCP:
+		if d.Address.Family().IsIP() {
+			addr = &net.TCPAddr{
+				IP:   d.Address.IP(),
+				Port: int(d.Port),
+			}
+		}
+	case Network_UDP:
+		if d.Address.Family().IsIP() {
+			addr = &net.UDPAddr{
+				IP:   d.Address.IP(),
+				Port: int(d.Port),
+			}
+		}
+	case Network_UNIX:
+		if d.Address.Family().IsDomain() {
+			addr = &net.UnixAddr{
+				Name: d.Address.String(),
+				Net:  d.Network.SystemString(),
+			}
+		}
+	}
+	return addr
+}
+
 // String returns the strings form of this Destination.
 func (d Destination) String() string {
 	prefix := "unknown:"

common/net/destination.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: common/net/destination.proto
 

common/net/network.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: common/net/network.proto
 

common/net/port.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: common/net/port.proto
 

common/ocsp/ocsp.go

@@ -28,6 +28,9 @@ func GetOCSPStapling(cert [][]byte, path string) ([]byte, error) {
 	ocspData, err := GetOCSPForFile(path)
 	if err != nil {
 		ocspData, err = GetOCSPForCert(cert)
+		if err != nil {
+			return nil, err
+		}
 		if !CheckOCSPFileIsNotExist(path) {
 			err = os.Remove(path)
 			if err != nil {

common/platform/others.go

@@ -17,15 +17,13 @@ func LineSeparator() string {
 }
 
 func GetToolLocation(file string) string {
-	const name = "xray.location.tool"
-	toolPath := EnvFlag{Name: name, AltName: NormalizeEnvName(name)}.GetValue(getExecutableDir)
+	toolPath := NewEnvFlag(ToolLocation).GetValue(getExecutableDir)
 	return filepath.Join(toolPath, file)
 }
 
 // GetAssetLocation searches for `file` in certain locations
 func GetAssetLocation(file string) string {
-	const name = "xray.location.asset"
-	assetPath := NewEnvFlag(name).GetValue(getExecutableDir)
+	assetPath := NewEnvFlag(AssetLocation).GetValue(getExecutableDir)
 	defPath := filepath.Join(assetPath, file)
 	for _, p := range []string{
 		defPath,

common/platform/platform.go

@@ -7,6 +7,24 @@ import (
 	"strings"
 )
 
+const (
+	PluginLocation  = "xray.location.plugin"
+	ConfigLocation  = "xray.location.config"
+	ConfdirLocation = "xray.location.confdir"
+	ToolLocation    = "xray.location.tool"
+	AssetLocation   = "xray.location.asset"
+
+	UseReadV         = "xray.buf.readv"
+	UseFreedomSplice = "xray.buf.splice"
+	UseVmessPadding  = "xray.vmess.padding"
+	UseCone          = "xray.cone.disabled"
+
+	BufferSize           = "xray.ray.buffer.size"
+	BrowserDialerAddress = "xray.browser.dialer"
+	XUDPLog              = "xray.xudp.show"
+	XUDPBaseKey          = "xray.xudp.basekey"
+)
+
 type EnvFlag struct {
 	Name    string
 	AltName string
@@ -67,20 +85,17 @@ func getExecutableSubDir(dir string) func() string {
 }
 
 func GetPluginDirectory() string {
-	const name = "xray.location.plugin"
-	pluginDir := NewEnvFlag(name).GetValue(getExecutableSubDir("plugins"))
+	pluginDir := NewEnvFlag(PluginLocation).GetValue(getExecutableSubDir("plugins"))
 	return pluginDir
 }
 
 func GetConfigurationPath() string {
-	const name = "xray.location.config"
-	configPath := NewEnvFlag(name).GetValue(getExecutableDir)
+	configPath := NewEnvFlag(ConfigLocation).GetValue(getExecutableDir)
 	return filepath.Join(configPath, "config.json")
 }
 
 // GetConfDirPath reads "xray.location.confdir"
 func GetConfDirPath() string {
-	const name = "xray.location.confdir"
-	configPath := NewEnvFlag(name).GetValue(func() string { return "" })
+	configPath := NewEnvFlag(ConfdirLocation).GetValue(func() string { return "" })
 	return configPath
 }

common/platform/windows.go

@@ -15,14 +15,12 @@ func LineSeparator() string {
 }
 
 func GetToolLocation(file string) string {
-	const name = "xray.location.tool"
-	toolPath := EnvFlag{Name: name, AltName: NormalizeEnvName(name)}.GetValue(getExecutableDir)
+	toolPath := NewEnvFlag(ToolLocation).GetValue(getExecutableDir)
 	return filepath.Join(toolPath, file+".exe")
 }
 
 // GetAssetLocation searches for `file` in the excutable dir
 func GetAssetLocation(file string) string {
-	const name = "xray.location.asset"
-	assetPath := NewEnvFlag(name).GetValue(getExecutableDir)
+	assetPath := NewEnvFlag(AssetLocation).GetValue(getExecutableDir)
 	return filepath.Join(assetPath, file)
 }

common/protocol/headers.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: common/protocol/headers.proto
 

common/protocol/server_spec.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: common/protocol/server_spec.proto
 

common/protocol/user.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: common/protocol/user.proto
 

common/reflect/marshal.go

@@ -0,0 +1,176 @@
+package reflect
+
+import (
+	"encoding/json"
+	"reflect"
+
+	cserial "github.com/xtls/xray-core/common/serial"
+)
+
+func MarshalToJson(v interface{}) (string, bool) {
+	if itf := marshalInterface(v, true); itf != nil {
+		if b, err := json.MarshalIndent(itf, "", "  "); err == nil {
+			return string(b[:]), true
+		}
+	}
+	return "", false
+}
+
+func marshalTypedMessage(v *cserial.TypedMessage, ignoreNullValue bool) interface{} {
+	if v == nil {
+		return nil
+	}
+	tmsg, err := v.GetInstance()
+	if err != nil {
+		return nil
+	}
+	r := marshalInterface(tmsg, ignoreNullValue)
+	if msg, ok := r.(map[string]interface{}); ok {
+		msg["_TypedMessage_"] = v.Type
+	}
+	return r
+}
+
+func marshalSlice(v reflect.Value, ignoreNullValue bool) interface{} {
+	r := make([]interface{}, 0)
+	for i := 0; i < v.Len(); i++ {
+		rv := v.Index(i)
+		if rv.CanInterface() {
+			value := rv.Interface()
+			r = append(r, marshalInterface(value, ignoreNullValue))
+		}
+	}
+	return r
+}
+
+func marshalStruct(v reflect.Value, ignoreNullValue bool) interface{} {
+	r := make(map[string]interface{})
+	t := v.Type()
+	for i := 0; i < v.NumField(); i++ {
+		rv := v.Field(i)
+		if rv.CanInterface() {
+			ft := t.Field(i)
+			name := ft.Name
+			value := rv.Interface()
+			tv := marshalInterface(value, ignoreNullValue)
+			if tv != nil || !ignoreNullValue {
+				r[name] = tv
+			}
+		}
+	}
+	return r
+}
+
+func marshalMap(v reflect.Value, ignoreNullValue bool) interface{} {
+	// policy.level is map[uint32] *struct
+	kt := v.Type().Key()
+	vt := reflect.TypeOf((*interface{})(nil))
+	mt := reflect.MapOf(kt, vt)
+	r := reflect.MakeMap(mt)
+	for _, key := range v.MapKeys() {
+		rv := v.MapIndex(key)
+		if rv.CanInterface() {
+			iv := rv.Interface()
+			tv := marshalInterface(iv, ignoreNullValue)
+			if tv != nil || !ignoreNullValue {
+				r.SetMapIndex(key, reflect.ValueOf(&tv))
+			}
+		}
+	}
+	return r.Interface()
+}
+
+func marshalIString(v interface{}) (r string, ok bool) {
+	defer func() {
+		if err := recover(); err != nil {
+			r = ""
+			ok = false
+		}
+	}()
+
+	if iStringFn, ok := v.(interface{ String() string }); ok {
+		return iStringFn.String(), true
+	}
+	return "", false
+}
+
+func marshalKnownType(v interface{}, ignoreNullValue bool) (interface{}, bool) {
+	switch ty := v.(type) {
+	case cserial.TypedMessage:
+		return marshalTypedMessage(&ty, ignoreNullValue), true
+	case *cserial.TypedMessage:
+		return marshalTypedMessage(ty, ignoreNullValue), true
+	case map[string]json.RawMessage:
+		return ty, true
+	case []json.RawMessage:
+		return ty, true
+	case *json.RawMessage:
+		return ty, true
+	case json.RawMessage:
+		return ty, true
+	default:
+		return nil, false
+	}
+}
+
+func isValueKind(kind reflect.Kind) bool {
+	switch kind {
+	case reflect.Bool,
+		reflect.Int,
+		reflect.Int8,
+		reflect.Int16,
+		reflect.Int32,
+		reflect.Int64,
+		reflect.Uint,
+		reflect.Uint8,
+		reflect.Uint16,
+		reflect.Uint32,
+		reflect.Uint64,
+		reflect.Uintptr,
+		reflect.Float32,
+		reflect.Float64,
+		reflect.Complex64,
+		reflect.Complex128,
+		reflect.String:
+		return true
+	default:
+		return false
+	}
+}
+
+func marshalInterface(v interface{}, ignoreNullValue bool) interface{} {
+
+	if r, ok := marshalKnownType(v, ignoreNullValue); ok {
+		return r
+	}
+
+	rv := reflect.ValueOf(v)
+	if rv.Kind() == reflect.Ptr {
+		rv = rv.Elem()
+	}
+	k := rv.Kind()
+	if k == reflect.Invalid {
+		return nil
+	}
+	if isValueKind(k) {
+		return v
+	}
+
+	switch k {
+	case reflect.Struct:
+		return marshalStruct(rv, ignoreNullValue)
+	case reflect.Slice:
+		return marshalSlice(rv, ignoreNullValue)
+	case reflect.Array:
+		return marshalSlice(rv, ignoreNullValue)
+	case reflect.Map:
+		return marshalMap(rv, ignoreNullValue)
+	default:
+		break
+	}
+
+	if str, ok := marshalIString(v); ok {
+		return str
+	}
+	return nil
+}

common/reflect/marshal_test.go

@@ -0,0 +1,187 @@
+package reflect_test
+
+import (
+	"bytes"
+	"encoding/json"
+	"strings"
+	"testing"
+
+	. "github.com/xtls/xray-core/common/reflect"
+	cserial "github.com/xtls/xray-core/common/serial"
+	iserial "github.com/xtls/xray-core/infra/conf/serial"
+)
+
+func TestMashalStruct(t *testing.T) {
+	type Foo = struct {
+		N   int                             `json:"n"`
+		Np  *int                            `json:"np"`
+		S   string                          `json:"s"`
+		Arr *[]map[string]map[string]string `json:"arr"`
+	}
+
+	n := 1
+	np := &n
+	arr := make([]map[string]map[string]string, 0)
+	m1 := make(map[string]map[string]string, 0)
+	m2 := make(map[string]string, 0)
+	m2["hello"] = "world"
+	m1["foo"] = m2
+
+	arr = append(arr, m1)
+
+	f1 := Foo{
+		N:   n,
+		Np:  np,
+		S:   "hello",
+		Arr: &arr,
+	}
+
+	s, ok1 := MarshalToJson(f1)
+	sp, ok2 := MarshalToJson(&f1)
+
+	if !ok1 || !ok2 || s != sp {
+		t.Error("marshal failed")
+	}
+
+	f2 := Foo{}
+	if json.Unmarshal([]byte(s), &f2) != nil {
+		t.Error("json unmarshal failed")
+	}
+
+	v := (*f2.Arr)[0]["foo"]["hello"]
+
+	if f1.N != f2.N || *(f1.Np) != *(f2.Np) || f1.S != f2.S || v != "world" {
+		t.Error("f1 not equal to f2")
+	}
+}
+
+func TestMarshalConfigJson(t *testing.T) {
+
+	buf := bytes.NewBufferString(getConfig())
+	config, err := iserial.DecodeJSONConfig(buf)
+	if err != nil {
+		t.Error("decode JSON config failed")
+	}
+
+	bc, err := config.Build()
+	if err != nil {
+		t.Error("build core config failed")
+	}
+
+	tmsg := cserial.ToTypedMessage(bc)
+	tc, ok := MarshalToJson(tmsg)
+	if !ok {
+		t.Error("marshal config failed")
+	}
+
+	// t.Log(tc)
+
+	keywords := []string{
+		"4784f9b8-a879-4fec-9718-ebddefa47750",
+		"bing.com",
+		"DomainStrategy",
+		"InboundTag",
+		"Level",
+		"Stats",
+		"UserDownlink",
+		"UserUplink",
+		"System",
+		"InboundDownlink",
+		"OutboundUplink",
+	}
+	for _, kw := range keywords {
+		if !strings.Contains(tc, kw) {
+			t.Error("marshaled config error")
+		}
+	}
+}
+
+func getConfig() string {
+	return `{
+		"log": {
+		  "loglevel": "debug"
+		},
+		"stats": {},
+		"policy": {
+		  "levels": {
+			"0": {
+			  "statsUserUplink": true,
+			  "statsUserDownlink": true
+			}
+		  },
+		  "system": {
+			"statsInboundUplink": true,
+			"statsInboundDownlink": true,
+			"statsOutboundUplink": true,
+			"statsOutboundDownlink": true
+		  }
+		},
+		"inbounds": [
+		  {
+			"tag": "agentin",
+			"protocol": "http",
+			"port": 8080,
+			"listen": "127.0.0.1",
+			"settings": {}
+		  },
+		  {
+			"listen": "127.0.0.1",
+			"port": 10085,
+			"protocol": "dokodemo-door",
+			"settings": {
+			  "address": "127.0.0.1"
+			},
+			"tag": "api-in"
+		  }
+		],
+		"api": {
+		  "tag": "api",
+		  "services": [
+			"HandlerService",
+			"StatsService"
+		  ]
+		},
+		"routing": {
+		  "rules": [
+			{
+			  "inboundTag": [
+				"api-in"
+			  ],
+			  "outboundTag": "api",
+			  "type": "field"
+			}
+		  ],
+		  "domainStrategy": "AsIs"
+		},
+		"outbounds": [
+		  {
+			"protocol": "vless",
+			"settings": {
+			  "vnext": [
+				{
+				  "address": "1.2.3.4",
+				  "port": 1234,
+				  "users": [
+					{
+					  "id": "4784f9b8-a879-4fec-9718-ebddefa47750",
+					  "encryption": "none"
+					}
+				  ]
+				}
+			  ]
+			},
+			"tag": "agentout",
+			"streamSettings": {
+			  "network": "ws",
+			  "security": "none",
+			  "wsSettings": {
+				"path": "/?ed=2048",
+				"headers": {
+				  "Host": "bing.com"
+				}
+			  }
+			}
+		  }
+		]
+	  }`
+}

common/serial/typed_message.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: common/serial/typed_message.proto
 

common/session/context.go

@@ -24,6 +24,7 @@ const (
 	dispatcherKey
 	timeoutOnlyKey
 	allowedNetworkKey
+	handlerSessionKey
 )
 
 // ContextWithID returns a new context with the given ID.

common/session/session.go

@@ -50,6 +50,16 @@ type Inbound struct {
 	Conn net.Conn
 	// Timer of the inbound buf copier. May be nil.
 	Timer *signal.ActivityTimer
+	// CanSpliceCopy is a property for this connection, set by both inbound and outbound
+	// 1 = can, 2 = after processing protocol info should be able to, 3 = cannot
+	CanSpliceCopy int
+}
+
+func(i *Inbound) SetCanSpliceCopy(canSpliceCopy int) int {
+	if canSpliceCopy > i.CanSpliceCopy {
+		i.CanSpliceCopy = canSpliceCopy
+	}
+	return i.CanSpliceCopy
 }
 
 // Outbound is the metadata of an outbound connection.
@@ -60,6 +70,10 @@ type Outbound struct {
 	RouteTarget    net.Destination
 	// Gateway address
 	Gateway net.Address
+	// Name of the outbound proxy that handles the connection.
+	Name string
+	// Conn is actually internet.Connection. May be nil. It is currently nil for outbound with proxySettings 
+	Conn net.Conn
 }
 
 // SniffingRequest controls the behavior of content sniffing.

common/singbridge/dialer.go

@@ -43,7 +43,7 @@ func NewOutboundDialer(outbound proxy.Outbound, dialer internet.Dialer) *XrayOut
 }
 
 func (d *XrayOutboundDialer) DialContext(ctx context.Context, network string, destination M.Socksaddr) (net.Conn, error) {
-	ctx = session.ContextWithOutbound(context.Background(), &session.Outbound{
+	ctx = session.ContextWithOutbound(ctx, &session.Outbound{
 		Target: ToDestination(destination, ToNetwork(network)),
 	})
 	opts := []pipe.Option{pipe.WithSizeLimit(64 * 1024)}

common/xudp/errors.generated.go

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

common/xudp/xudp.go

@@ -6,11 +6,13 @@ import (
 	"encoding/base64"
 	"fmt"
 	"io"
-	"os"
+	"strconv"
 	"strings"
+	"time"
 
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/platform"
 	"github.com/xtls/xray-core/common/protocol"
 	"github.com/xtls/xray-core/common/session"
 	"lukechampine.com/blake3"
@@ -28,22 +30,20 @@ var (
 	BaseKey []byte
 )
 
-const (
-	EnvShow    = "XRAY_XUDP_SHOW"
-	EnvBaseKey = "XRAY_XUDP_BASEKEY"
-)
-
 func init() {
-	if strings.ToLower(os.Getenv(EnvShow)) == "true" {
+	if strings.ToLower(platform.NewEnvFlag(platform.XUDPLog).GetValue(func() string { return "" })) == "true" {
 		Show = true
 	}
-	if raw, found := os.LookupEnv(EnvBaseKey); found {
-		if BaseKey, _ = base64.RawURLEncoding.DecodeString(raw); len(BaseKey) == 32 {
-			return
-		}
-		panic(EnvBaseKey + ": invalid value: " + raw)
-	}
 	rand.Read(BaseKey)
+	go func() {
+		time.Sleep(100 * time.Millisecond) // this is not nice, but need to give some time for Android to setup ENV 
+		if raw := platform.NewEnvFlag(platform.XUDPBaseKey).GetValue(func() string { return "" }); raw != "" {
+			if BaseKey, _ = base64.RawURLEncoding.DecodeString(raw); len(BaseKey) == 32 {
+				return
+			}
+			panic(platform.XUDPBaseKey + ": invalid value (BaseKey must be 32 bytes): " + raw + " len " + strconv.Itoa(len(BaseKey)))
+		}
+	}()
 }
 
 func GetGlobalID(ctx context.Context) (globalID [8]byte) {
@@ -56,7 +56,7 @@ func GetGlobalID(ctx context.Context) (globalID [8]byte) {
 		h.Write([]byte(inbound.Source.String()))
 		copy(globalID[:], h.Sum(nil))
 		if Show {
-			fmt.Printf("XUDP inbound.Source.String(): %v\tglobalID: %v\n", inbound.Source.String(), globalID)
+			newError(fmt.Sprintf("XUDP inbound.Source.String(): %v\tglobalID: %v\n", inbound.Source.String(), globalID)).WriteToLog(session.ExportIDToError(ctx))
 		}
 	}
 	return

core/config.go

@@ -24,10 +24,14 @@ type ConfigLoader func(input interface{}) (*Config, error)
 // ConfigBuilder is a builder to build core.Config from filenames and formats
 type ConfigBuilder func(files []string, formats []string) (*Config, error)
 
+// ConfigMerger merge multiple json configs into on config
+type ConfigsMerger func(files []string, formats []string) (string, error)
+
 var (
 	configLoaderByName    = make(map[string]*ConfigFormat)
 	configLoaderByExt     = make(map[string]*ConfigFormat)
 	ConfigBuilderForFiles ConfigBuilder
+	ConfigMergedFormFiles ConfigsMerger
 )
 
 // RegisterConfigLoader add a new ConfigLoader.
@@ -49,6 +53,23 @@ func RegisterConfigLoader(format *ConfigFormat) error {
 	return nil
 }
 
+func GetMergedConfig(args cmdarg.Arg) (string, error) {
+	files := make([]string, 0)
+	formats := make([]string, 0)
+	supported := []string{"json", "yaml", "toml"}
+	for _, file := range args {
+		format := getFormat(file)
+		for _, s := range supported {
+			if s == format {
+				files = append(files, file)
+				formats = append(formats, format)
+				break
+			}
+		}
+	}
+	return ConfigMergedFormFiles(files, formats)
+}
+
 func GetFormatByExtension(ext string) string {
 	switch strings.ToLower(ext) {
 	case "pb", "protobuf":

core/config.pb.go

@@ -1,6 +1,6 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.30.0
+// 	protoc-gen-go v1.32.0
 // 	protoc        v4.23.1
 // source: core/config.proto
 

core/core.go

@@ -21,7 +21,7 @@ import (
 var (
 	Version_x byte = 1
 	Version_y byte = 8
-	Version_z byte = 4
+	Version_z byte = 9
 )
 
 var (

core/xray.go

@@ -2,11 +2,11 @@ package core
 
 import (
 	"context"
-	"os"
 	"reflect"
 	"sync"
 
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/platform"
 	"github.com/xtls/xray-core/common/serial"
 	"github.com/xtls/xray-core/features"
 	"github.com/xtls/xray-core/features/dns"
@@ -181,7 +181,8 @@ func NewWithContext(ctx context.Context, config *Config) (*Instance, error) {
 }
 
 func initInstanceWithConfig(config *Config, server *Instance) (bool, error) {
-	server.ctx = context.WithValue(server.ctx, "cone", os.Getenv("XRAY_CONE_DISABLED") != "true")
+	server.ctx = context.WithValue(server.ctx, "cone", 
+		platform.NewEnvFlag(platform.UseCone).GetValue(func() string { return "" }) != "true")
 
 	if config.Transport != nil {
 		features.PrintDeprecatedFeatureWarning("global transport settings")

features/policy/policy.go

@@ -83,12 +83,8 @@ func ManagerType() interface{} {
 var defaultBufferSize int32
 
 func init() {
-	const key = "xray.ray.buffer.size"
 	const defaultValue = -17
-	size := platform.EnvFlag{
-		Name:    key,
-		AltName: platform.NormalizeEnvName(key),
-	}.GetValueAsInt(defaultValue)
+	size := platform.NewEnvFlag(platform.BufferSize).GetValueAsInt(defaultValue)
 
 	switch size {
 	case 0:

features/routing/balancer.go

@@ -0,0 +1,10 @@
+package routing
+
+type BalancerOverrider interface {
+	SetOverrideTarget(tag, target string) error
+	GetOverrideTarget(tag string) (string, error)
+}
+
+type BalancerPrincipleTarget interface {
+	GetPrincipleTarget(tag string) ([]string, error)
+}

go.mod

@@ -1,59 +1,61 @@
 module github.com/xtls/xray-core
 
-go 1.21
+go 1.22
 
 require (
 	github.com/ghodss/yaml v1.0.1-0.20220118164431-d8423dcdf344
-	github.com/golang/mock v1.6.0
-	github.com/google/go-cmp v0.5.9
-	github.com/gorilla/websocket v1.5.0
-	github.com/miekg/dns v1.1.55
+	github.com/golang/mock v1.7.0-rc.1
+	github.com/google/go-cmp v0.6.0
+	github.com/gorilla/websocket v1.5.1
+	github.com/miekg/dns v1.1.58
 	github.com/pelletier/go-toml v1.9.5
 	github.com/pires/go-proxyproto v0.7.0
-	github.com/quic-go/quic-go v0.38.1
-	github.com/refraction-networking/utls v1.4.3
-	github.com/sagernet/sing v0.2.9
-	github.com/sagernet/sing-shadowsocks v0.2.4
-	github.com/sagernet/wireguard-go v0.0.0-20221116151939-c99467f53f2c
+	github.com/quic-go/quic-go v0.41.0
+	github.com/refraction-networking/utls v1.6.3
+	github.com/sagernet/sing v0.3.6
+	github.com/sagernet/sing-shadowsocks v0.2.6
 	github.com/seiflotfy/cuckoofilter v0.0.0-20220411075957-e3b120b3f5fb
-	github.com/stretchr/testify v1.8.4
+	github.com/stretchr/testify v1.9.0
 	github.com/v2fly/ss-bloomring v0.0.0-20210312155135-28617310f63e
-	github.com/xtls/reality v0.0.0-20230828171259-e426190d57f6
-	go4.org/netipx v0.0.0-20230824141953-6213f710f925
-	golang.org/x/crypto v0.12.0
-	golang.org/x/net v0.14.0
-	golang.org/x/sync v0.3.0
-	golang.org/x/sys v0.11.0
-	google.golang.org/grpc v1.57.0
-	google.golang.org/protobuf v1.31.0
-	gvisor.dev/gvisor v0.0.0-20230822212503-5bf4e5f98744
+	github.com/vishvananda/netlink v1.2.1-beta.2.0.20230316163032-ced5aaba43e3
+	github.com/xtls/reality v0.0.0-20231112171332-de1173cf2b19
+	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba
+	golang.org/x/crypto v0.21.0
+	golang.org/x/net v0.22.0
+	golang.org/x/sync v0.6.0
+	golang.org/x/sys v0.18.0
+	golang.zx2c4.com/wireguard v0.0.0-20231211153847-12269c276173
+	google.golang.org/grpc v1.62.1
+	google.golang.org/protobuf v1.33.0
+	gvisor.dev/gvisor v0.0.0-20231104011432-48a6d7d5bd0b
 	h12.io/socks v1.0.3
 	lukechampine.com/blake3 v1.2.1
 )
 
 require (
-	github.com/andybalholm/brotli v1.0.5 // indirect
+	github.com/andybalholm/brotli v1.1.0 // indirect
+	github.com/cloudflare/circl v1.3.7 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect
 	github.com/dgryski/go-metro v0.0.0-20211217172704-adc40b04c140 // indirect
 	github.com/francoispqt/gojay v1.2.13 // indirect
-	github.com/gaukas/godicttls v0.0.4 // indirect
 	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
-	github.com/golang/protobuf v1.5.3 // indirect
+	github.com/golang/protobuf v1.5.4 // indirect
 	github.com/google/btree v1.1.2 // indirect
-	github.com/google/pprof v0.0.0-20230821062121-407c9e7a662f // indirect
-	github.com/klauspost/compress v1.16.7 // indirect
-	github.com/klauspost/cpuid/v2 v2.2.5 // indirect
-	github.com/onsi/ginkgo/v2 v2.12.0 // indirect
+	github.com/google/pprof v0.0.0-20240227163752-401108e1b7e7 // indirect
+	github.com/klauspost/compress v1.17.7 // indirect
+	github.com/klauspost/cpuid/v2 v2.2.7 // indirect
+	github.com/onsi/ginkgo/v2 v2.16.0 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/quic-go/qtls-go1-20 v0.3.3 // indirect
 	github.com/riobard/go-bloom v0.0.0-20200614022211-cdc8013cb5b3 // indirect
-	go.uber.org/atomic v1.11.0 // indirect
-	golang.org/x/exp v0.0.0-20230725093048-515e97ebf090 // indirect
-	golang.org/x/mod v0.12.0 // indirect
-	golang.org/x/text v0.12.0 // indirect
-	golang.org/x/time v0.3.0 // indirect
-	golang.org/x/tools v0.12.0 // indirect
-	google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d // indirect
+	github.com/vishvananda/netns v0.0.4 // indirect
+	go.uber.org/mock v0.4.0 // indirect
+	golang.org/x/exp v0.0.0-20240222234643-814bf88cf225 // indirect
+	golang.org/x/mod v0.16.0 // indirect
+	golang.org/x/text v0.14.0 // indirect
+	golang.org/x/time v0.5.0 // indirect
+	golang.org/x/tools v0.19.0 // indirect
+	golang.zx2c4.com/wintun v0.0.0-20230126152724-0fa3db229ce2 // indirect
+	google.golang.org/genproto/googleapis/rpc v0.0.0-20240308144416-29370a3891b7 // indirect
 	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -8,13 +8,15 @@ dmitri.shuralyov.com/service/change v0.0.0-20181023043359-a85b471d5412/go.mod h1
 dmitri.shuralyov.com/state v0.0.0-20180228185332-28bcc343414c/go.mod h1:0PRwlb0D6DFvNNtx+9ybjezNCa8XF0xaYcETyp6rHWU=
 git.apache.org/thrift.git v0.0.0-20180902110319-2566ecd5d999/go.mod h1:fPE2ZNJGynbRyZ4dJvy6G277gSllfV2HJqblrnkyeyg=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
-github.com/andybalholm/brotli v1.0.5 h1:8uQZIdzKmjc/iuPu7O2ioW48L81FgatrcpfFmiq/cCs=
-github.com/andybalholm/brotli v1.0.5/go.mod h1:fO7iG3H7G2nSZ7m0zPUDn85XEX2GTukHGRSepvi9Eig=
+github.com/andybalholm/brotli v1.1.0 h1:eLKJA0d02Lf0mVpIDgYnqXcUn0GqVmEFny3VuID1U3M=
+github.com/andybalholm/brotli v1.1.0/go.mod h1:sms7XGricyQI9K10gOSf56VKKWS4oLer58Q+mhRPtnY=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239/go.mod h1:2FmKhYUyUczH0OGQWaF5ceTx0UBShxjsH6f8oGKYe2c=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/bradfitz/go-smtpd v0.0.0-20170404230938-deb6d6237625/go.mod h1:HYsPBTaaSFSlLx/70C2HPIMNZpVV8+vt/A+FMnYP11g=
 github.com/buger/jsonparser v0.0.0-20181115193947-bf1c66bbce23/go.mod h1:bbYlZJ7hK1yFx9hf58LP0zeX7UjIGs20ufpu3evjr+s=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
+github.com/cloudflare/circl v1.3.7 h1:qlCDlTPz2n9fu58M0Nh1J/JzcFpfgkFHHX3O35r5vcU=
+github.com/cloudflare/circl v1.3.7/go.mod h1:sRTcRWXGLrKw6yIGJ+l7amYJFfAXbZG0kBSc8r4zxgA=
 github.com/coreos/go-systemd v0.0.0-20181012123002-c6f51f82210d/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
@@ -27,15 +29,13 @@ github.com/flynn/go-shlex v0.0.0-20150515145356-3f9db97f8568/go.mod h1:xEzjJPgXI
 github.com/francoispqt/gojay v1.2.13 h1:d2m3sFjloqoIUQU3TsHBgj6qg/BVGlTBeHDUmyJnXKk=
 github.com/francoispqt/gojay v1.2.13/go.mod h1:ehT5mTG4ua4581f1++1WLG0vPdaA9HaiDsoyrBGkyDY=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
-github.com/gaukas/godicttls v0.0.4 h1:NlRaXb3J6hAnTmWdsEKb9bcSBD6BvcIjdGdeb0zfXbk=
-github.com/gaukas/godicttls v0.0.4/go.mod h1:l6EenT4TLWgTdwslVb4sEMOCf7Bv0JAK67deKr9/NCI=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
 github.com/ghodss/yaml v1.0.1-0.20220118164431-d8423dcdf344 h1:Arcl6UOIS/kgO2nW3A65HN+7CMjSDP/gofXL4CZt1V4=
 github.com/ghodss/yaml v1.0.1-0.20220118164431-d8423dcdf344/go.mod h1:GIjDIg/heH5DOkXY3YJ/wNhfHsQHoXGjl8G8amsYQ1I=
 github.com/gliderlabs/ssh v0.1.1/go.mod h1:U7qILu1NlMHj9FlMhZLlkCdDnU1DBEAqr0aevW3Awn0=
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@@ -43,31 +43,29 @@ github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfU
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@@ -76,10 +74,10 @@ github.com/jellevandenhooff/dkim v0.0.0-20150330215556-f50fe3d243e1/go.mod h1:E0
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@@ -90,16 +88,16 @@ github.com/lunixbochs/vtclean v1.0.0/go.mod h1:pHhQNgMf3btfWnGBVipUOjRYhoOsdGqdm
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@@ -114,21 +112,17 @@ github.com/prometheus/client_golang v0.8.0/go.mod h1:7SWBe2y4D6OKWSNQJUaRYU/AaXP
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@@ -159,38 +153,43 @@ github.com/sourcegraph/syntaxhighlight v0.0.0-20170531221838-bd320f5d308e/go.mod
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@@ -264,18 +269,16 @@ google.golang.org/genproto v0.0.0-20180831171423-11092d34479b/go.mod h1:JiN7NxoA
 google.golang.org/genproto v0.0.0-20181029155118-b69ba1387ce2/go.mod h1:JiN7NxoALGmiZfu7CAH4rXhgtRTLTxftemlI0sWmxmc=
 google.golang.org/genproto v0.0.0-20181202183823-bd91e49a0898/go.mod h1:7Ep/1NZk928CDR8SjdVbjWNpdIf6nzjE3BTgJDr2Atg=
 google.golang.org/genproto v0.0.0-20190306203927-b5d61aea6440/go.mod h1:VzzqZJRnGkLBvHegQrXjBqPurQTc5/KpmUdxsrq26oE=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d h1:uvYuEyMHKNt+lT4K3bN6fGswmK8qSvcreM3BwjDh+y4=
-google.golang.org/genproto/googleapis/rpc v0.0.0-20230822172742-b8732ec3820d/go.mod h1:+Bk1OCOj40wS2hwAMA+aCW9ypzm63QTBBHp6lQ3p+9M=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240308144416-29370a3891b7 h1:em/y72n4XlYRtayY/cVj6pnVzHa//BDA1BdoO+z9mdE=
+google.golang.org/genproto/googleapis/rpc v0.0.0-20240308144416-29370a3891b7/go.mod h1:UCOku4NytXMJuLQE5VuqA5lX3PcHCBo8pxNyvkf4xBs=
 google.golang.org/grpc v1.14.0/go.mod h1:yo6s7OP7yaDglbqo1J04qKzAhqBH6lvTonzMVmEdcZw=
 google.golang.org/grpc v1.16.0/go.mod h1:0JHn/cJsOMiMfNA9+DeHDlAU7KAAB5GDlYFpa9MZMio=
 google.golang.org/grpc v1.17.0/go.mod h1:6QZJwpn2B+Zp71q/5VxRsJ6NXXVCE5NRUHRo+f3cWCs=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.57.0 h1:kfzNeI/klCGD2YPMUlaGNT3pxvYfga7smW3Vth8Zsiw=
-google.golang.org/grpc v1.57.0/go.mod h1:Sd+9RMTACXwmub0zcNY2c4arhtrbBYD1AUHI/dt16Mo=
-google.golang.org/protobuf v1.26.0-rc.1/go.mod h1:jlhhOSvTdKEhbULTjvd4ARK9grFBp09yW+WbY/TyQbw=
-google.golang.org/protobuf v1.26.0/go.mod h1:9q0QmTI4eRPtz6boOQmLYwt+qCgq0jsYwAQnmE0givc=
-google.golang.org/protobuf v1.31.0 h1:g0LDEJHgrBl9N9r17Ru3sqWhkIx2NB67okBHPwC7hs8=
-google.golang.org/protobuf v1.31.0/go.mod h1:HV8QOd/L58Z+nl8r43ehVNZIU/HEI6OcFqwMG9pJV4I=
+google.golang.org/grpc v1.62.1 h1:B4n+nfKzOICUXMgyrNd19h/I9oH0L1pizfk1d4zSgTk=
+google.golang.org/grpc v1.62.1/go.mod h1:IWTG0VlJLCh1SkC58F7np9ka9mx/WNkjl4PGJaiq+QE=
+google.golang.org/protobuf v1.33.0 h1:uNO2rsAINq/JlFpSdYEKIZ0uKD/R9cpdv0T+yoGwGmI=
+google.golang.org/protobuf v1.33.0/go.mod h1:c6P6GXX6sHbq/GpV6MGZEdwhWPcYBgnhAHhKbcUYpos=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
@@ -289,8 +292,8 @@ gopkg.in/yaml.v3 v3.0.0-20200605160147-a5ece683394c/go.mod h1:K4uyk7z7BCEPqu6E+C
 gopkg.in/yaml.v3 v3.0.1 h1:fxVm/GzAzEWqLHuvctI91KS9hhNmmWOoWu0XTYJS7CA=
 gopkg.in/yaml.v3 v3.0.1/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 grpc.go4.org v0.0.0-20170609214715-11d0a25b4919/go.mod h1:77eQGdRu53HpSqPFJFmuJdjuHRquDANNeA4x7B8WQ9o=
-gvisor.dev/gvisor v0.0.0-20230822212503-5bf4e5f98744 h1:tE44CyJgxEGzoPtHs9GI7ddKdgEGCREQBP54AmaVM+I=
-gvisor.dev/gvisor v0.0.0-20230822212503-5bf4e5f98744/go.mod h1:lYEMhXbxgudVhALYsMQrBaUAjM3NMinh8mKL1CJv7rc=
+gvisor.dev/gvisor v0.0.0-20231104011432-48a6d7d5bd0b h1:yqkg3pTifuKukuWanp8spDsL4irJkHF5WI0J47hU87o=
+gvisor.dev/gvisor v0.0.0-20231104011432-48a6d7d5bd0b/go.mod h1:10sU+Uh5KKNv1+2x2A0Gvzt8FjD3ASIhorV3YsauXhk=
 h12.io/socks v1.0.3 h1:Ka3qaQewws4j4/eDQnOdpr4wXsC//dXtWvftlIcCQUo=
 h12.io/socks v1.0.3/go.mod h1:AIhxy1jOId/XCz9BO+EIgNL2rQiPTBNnOfnVnQ+3Eck=
 honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=