v1.8.10

* add RuleTag to routing rules

* add router pb commands

* add and remove routing rules api

* cleanup

* fix

* improve error msg

* add append flag
apply balancer config

.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" },
@@ -22,6 +21,7 @@
   "linux-ppc64le": { "friendlyName": "linux-ppc64le" },
   "linux-ppc64": { "friendlyName": "linux-ppc64" },
   "linux-riscv64": { "friendlyName": "linux-riscv64" },
+  "linux-loong64": { "friendlyName": "linux-loong64" },
   "linux-s390x": { "friendlyName": "linux-s390x" },
   "openbsd-386": { "friendlyName": "openbsd-32" },
   "openbsd-amd64": { "friendlyName": "openbsd-64" },

.github/docker/Dockerfile

@@ -0,0 +1,22 @@
+# syntax=docker/dockerfile:1
+FROM --platform=$BUILDPLATFORM golang:alpine AS build
+WORKDIR /src
+COPY . .
+ARG TARGETOS TARGETARCH
+RUN GOOS=$TARGETOS GOARCH=$TARGETARCH CGO_ENABLED=0 go build -o xray -trimpath -ldflags "-s -w -buildid=" ./main
+
+FROM --platform=${TARGETPLATFORM} alpine:latest
+WORKDIR /root
+COPY .github/docker/files/config.json /etc/xray/config.json
+COPY --from=build /src/xray /usr/bin/xray
+RUN set -ex \
+	&& apk add --no-cache tzdata ca-certificates \
+	&& mkdir -p /var/log/xray /usr/share/xray \
+    && chmod +x /usr/bin/xray \
+	&& wget -O /usr/share/xray/geosite.dat https://github.com/Loyalsoldier/v2ray-rules-dat/releases/latest/download/geosite.dat \
+	&& wget -O /usr/share/xray/geoip.dat https://github.com/Loyalsoldier/v2ray-rules-dat/releases/latest/download/geoip.dat
+
+VOLUME /etc/xray
+ENV TZ=Asia/Shanghai
+ENTRYPOINT [ "/usr/bin/xray" ]
+CMD [ "-config", "/etc/xray/config.json" ]

.github/docker/files/config.json

@@ -0,0 +1,18 @@
+{
+  "inbounds": [{
+    "port": 9000,
+    "protocol": "vmess",
+    "settings": {
+      "clients": [
+        {
+          "id": "1eb6e917-774b-4a84-aff6-b058577c60a5",
+          "level": 1
+        }
+      ]
+    }
+  }],
+  "outbounds": [{
+    "protocol": "freedom",
+    "settings": {}
+  }]
+}

.github/workflows/docker.yml

@@ -0,0 +1,45 @@
+name: Build docker image
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build-image:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      - uses: actions/checkout@v4
+      - name: Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: ghcr.io/${{ github.repository_owner }}/xray-core
+          flavor: latest=true
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+      - name: Login to GitHub Container Registry
+        uses: docker/login-action@v3
+        with:
+          registry: ghcr.io
+          username: ${{ github.repository_owner }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+      - # Add support for more platforms with QEMU (optional)
+        # https://github.com/docker/setup-qemu-action
+        name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm64
+          file: .github/docker/Dockerfile
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.github/workflows/release.yml

@@ -20,18 +20,60 @@ on:
       - "go.sum"
       - ".github/workflows/*.yml"
 jobs:
+  prepare:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Restore Cache
+        uses: actions/cache/restore@v4
+        with:
+          path: resources
+          key: xray-geodat-
+
+      - name: Update Geodat
+        id: update
+        uses: nick-fields/retry@v3
+        with:
+          timeout_minutes: 60
+          retry_wait_seconds: 60
+          max_attempts: 60
+          command: |
+            [ -d 'resources' ] || mkdir resources
+            LIST=('geoip geoip geoip' 'domain-list-community dlc geosite')
+            for i in "${LIST[@]}"
+            do
+              INFO=($(echo $i | awk 'BEGIN{FS=" ";OFS=" "} {print $1,$2,$3}'))
+              FILE_NAME="${INFO[2]}.dat"
+              echo -e "Verifying HASH key..."
+              HASH="$(curl -sL "https://raw.githubusercontent.com/v2fly/${INFO[0]}/release/${INFO[1]}.dat.sha256sum" | awk -F ' ' '{print $1}')"
+              if [ -s "./resources/${FILE_NAME}" ] && [ "$(sha256sum "./resources/${FILE_NAME}" | awk -F ' ' '{print $1}')" == "${HASH}" ]; then
+                  continue
+              else
+                  echo -e "Downloading https://raw.githubusercontent.com/v2fly/${INFO[0]}/release/${INFO[1]}.dat..."
+                  curl -L "https://raw.githubusercontent.com/v2fly/${INFO[0]}/release/${INFO[1]}.dat" -o ./resources/${FILE_NAME}
+                  echo -e "Verifying HASH key..."
+                  [ "$(sha256sum "./resources/${FILE_NAME}" | awk -F ' ' '{print $1}')" == "${HASH}" ] || { echo -e "The HASH key of ${FILE_NAME} does not match cloud one."; exit 1; }
+                  echo "unhit=true" >> $GITHUB_OUTPUT
+              fi
+            done
+
+      - name: Save Cache
+        uses: actions/cache/save@v4
+        if: ${{ steps.update.outputs.unhit }}
+        with:
+          path: resources
+          key: xray-geodat-${{ github.sha }}-${{ github.run_number }}
+
   build:
+    needs: prepare
     permissions:
       contents: write
     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:
@@ -61,12 +103,14 @@ jobs:
             goarch: arm
             goarm: 7
           # BEGIN Other architectures
-          # BEGIN riscv64 & ARM64
+          # BEGIN riscv64 & ARM64 & LOONG64
           - goos: linux
             goarch: arm64
           - goos: linux
             goarch: riscv64
-          # END riscv64 & ARM64
+          - goos: linux
+            goarch: loong64
+          # END riscv64 & ARM64 & LOONG64
           # BEGIN MIPS
           - goos: linux
             goarch: mips64
@@ -112,81 +156,49 @@ jobs:
       CGO_ENABLED: 0
     steps:
       - name: Checkout codebase
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Show workflow information 
-        id: get_filename
         run: |
           export _NAME=$(jq ".[\"$GOOS-$GOARCH$GOARM$GOMIPS\"].friendlyName" -r < .github/build/friendly-filenames.json)
           echo "GOOS: $GOOS, GOARCH: $GOARCH, GOARM: $GOARM, GOMIPS: $GOMIPS, RELEASE_NAME: $_NAME"
-          echo "::set-output name=ASSET_NAME::$_NAME"
           echo "ASSET_NAME=$_NAME" >> $GITHUB_ENV
 
       - name: Set up Go
-        uses: actions/setup-go@v2
+        uses: actions/setup-go@v5
         with:
-          go-version: ^1.17.7
+          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
+          make
+          find . -maxdepth 1 -type f -regex '.*\(wxray\|xray\|xray_softfloat\)\(\|.exe\)' -exec mv {} ./build_assets/ \;
 
-      - 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: Restore Cache
+        uses: actions/cache/restore@v4
+        with:
+          path: resources
+          key: xray-geodat-
 
-      - name: Build Mips softfloat Xray
-        if: matrix.goarch == 'mips' || matrix.goarch == 'mipsle'
-        run: |
-          GOMIPS=softfloat go build -v -o build_assets/xray_softfloat -trimpath -ldflags "-s -w -buildid=" ./main
-
-      - name: Rename Windows Xray
-        if: matrix.goos == 'windows'
-        run: |
-          cd ./build_assets || exit 1
-          mv xray xray.exe
-
-      - name: Prepare to release
+      - name: Copy README.md & LICENSE
         run: |
+          mv -f resources/* build_assets
           cp ${GITHUB_WORKSPACE}/README.md ./build_assets/README.md
           cp ${GITHUB_WORKSPACE}/LICENSE ./build_assets/LICENSE
-          LIST=('geoip geoip geoip' 'domain-list-community dlc geosite')
-          for i in "${LIST[@]}"
-          do
-            INFO=($(echo $i | awk 'BEGIN{FS=" ";OFS=" "} {print $1,$2,$3}'))
-            LASTEST_TAG="$(curl -sL "https://api.github.com/repos/v2fly/${INFO[0]}/releases" | jq -r ".[0].tag_name" || echo "latest")"
-            FILE_NAME="${INFO[2]}.dat"
-            echo -e "Downloading ${FILE_NAME}..."
-            curl -L "https://github.com/v2fly/${INFO[0]}/releases/download/${LASTEST_TAG}/${INFO[1]}.dat" -o ./build_assets/${FILE_NAME}
-            echo -e "Verifying HASH key..."
-            HASH="$(curl -sL "https://github.com/v2fly/${INFO[0]}/releases/download/${LASTEST_TAG}/${INFO[1]}.dat.sha256sum" | awk -F ' ' '{print $1}')"
-            [ "$(sha256sum "./build_assets/${FILE_NAME}" | awk -F ' ' '{print $1}')" == "${HASH}" ] || { echo -e "The HASH key of ${FILE_NAME} does not match cloud one."; exit 1; }
-          done
 
       - name: Create ZIP archive
         shell: bash
         run: |
           pushd build_assets || exit 1
           touch -mt $(date +%Y01010000) *
-          zip -9vr ../Xray-$ASSET_NAME.zip .
+          zip -9vr ../Xray-${{ env.ASSET_NAME }}.zip .
           popd || exit 1
-          FILE=./Xray-$ASSET_NAME.zip
+          FILE=./Xray-${{ env.ASSET_NAME }}.zip
           DGST=$FILE.dgst
           for METHOD in {"md5","sha1","sha256","sha512"}
           do
@@ -195,20 +207,20 @@ jobs:
 
       - name: Change the name
         run: |
-          mv build_assets Xray-$ASSET_NAME
+          mv build_assets Xray-${{ env.ASSET_NAME }}
 
       - name: Upload files to Artifacts
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
-          name: Xray-${{ steps.get_filename.outputs.ASSET_NAME }}
+          name: Xray-${{ env.ASSET_NAME }}
           path: |
-            ./Xray-${{ steps.get_filename.outputs.ASSET_NAME }}/*
+            ./Xray-${{ env.ASSET_NAME }}/*
 
       - name: Upload binaries to release
         uses: svenstaro/upload-release-action@v2
         if: github.event_name == 'release'
         with:
           repo_token: ${{ secrets.GITHUB_TOKEN }}
-          file: ./Xray-${{ steps.get_filename.outputs.ASSET_NAME }}.zip*
+          file: ./Xray-${{ env.ASSET_NAME }}.zip*
           tag: ${{ github.ref }}
           file_glob: true

.github/workflows/test.yml

@@ -27,25 +27,18 @@ jobs:
       matrix:
         os: [windows-latest, ubuntu-latest, macos-latest]
     steps:
-      - name: Set up Go
-        uses: actions/setup-go@v2
-        with:
-          go-version: ^1.17.7
-          check-latest: true
       - name: Checkout codebase
-        uses: actions/checkout@v3
-
-      - name: Prepare geo*dat
-        if: ${{ matrix.os != 'windows-latest' }}
-        run: |
-          mkdir resources
-          wget -O ./resources/geoip.dat https://github.com/v2fly/geoip/releases/latest/download/geoip.dat
-          wget -O ./resources/geosite.dat https://github.com/v2fly/domain-list-community/releases/latest/download/dlc.dat
-      - name: Prepare geo*dat for Windows
-        if: ${{ matrix.os == 'windows-latest' }}
-        run: |
-          mkdir resources
-          Invoke-WebRequest -Uri "https://github.com/v2fly/geoip/releases/latest/download/geoip.dat" -OutFile "./resources/geoip.dat"
-          Invoke-WebRequest -Uri "https://github.com/v2fly/domain-list-community/releases/latest/download/dlc.dat" -OutFile "./resources/geosite.dat"
+        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@v4
+        with:
+          path: resources
+          key: xray-geodat-
+          enableCrossOsArchive: true
       - name: Test
         run: go test -timeout 1h -v ./...

.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

@@ -1,88 +1,16 @@
 # Project X
 
-[Project X](https://github.com/XTLS) originates from XTLS protocol, provides a set of network tools such as [Xray-core](https://github.com/XTLS/Xray-core) and [Xray-flutter](https://github.com/XTLS/Xray-flutter).
+[Project X](https://github.com/XTLS) originates from XTLS protocol, providing a set of network tools such as [Xray-core](https://github.com/XTLS/Xray-core) and [REALITY](https://github.com/XTLS/REALITY).
+
+[README](https://github.com/XTLS/Xray-core#readme) is open, so feel free to submit your project [here](https://github.com/XTLS/Xray-core/pulls).
 
 ## License
 
 [Mozilla Public License Version 2.0](https://github.com/XTLS/Xray-core/blob/main/LICENSE)
 
-## Installation
+## Documentation
 
-- Linux Script
-  - [Xray-install](https://github.com/XTLS/Xray-install)
-  - [Xray-script](https://github.com/kirin10000/Xray-script)
-- Docker
-  - [teddysun/xray](https://hub.docker.com/r/teddysun/xray)
-  - Xray-docker
-- One Click
-  - [ProxySU](https://github.com/proxysu/ProxySU)
-  - [v2ray-agent](https://github.com/mack-a/v2ray-agent)
-  - [Xray-yes](https://github.com/jiuqi9997/Xray-yes)
-  - [Xray_onekey](https://github.com/wulabing/Xray_onekey)
-- Magisk
-  - [Xray4Magisk](https://github.com/CerteKim/Xray4Magisk)
-  - [Xray_For_Magisk](https://github.com/E7KMbb/Xray_For_Magisk)
-- Homebrew
-  - `brew install xray`
-  - [(Tap) Repository 0](https://github.com/N4FA/homebrew-xray)
-  - [(Tap) Repository 1](https://github.com/xiruizhao/homebrew-xray)
-
-## Contributing
-[Code Of Conduct](https://github.com/XTLS/Xray-core/blob/main/CODE_OF_CONDUCT.md)
-
-## Usage
-
-[Xray-examples](https://github.com/XTLS/Xray-examples) / [VLESS-TCP-XTLS-WHATEVER](https://github.com/XTLS/Xray-examples/tree/main/VLESS-TCP-XTLS-WHATEVER)
-
-## GUI Clients
-
-- OpenWrt
-  - [PassWall](https://github.com/xiaorouji/openwrt-passwall)
-  - [Hello World](https://github.com/jerrykuku/luci-app-vssr)
-  - [ShadowSocksR Plus+](https://github.com/fw876/helloworld)
-  - [luci-app-xray](https://github.com/yichya/luci-app-xray) ([openwrt-xray](https://github.com/yichya/openwrt-xray))
-- Windows
-  - [v2rayN](https://github.com/2dust/v2rayN)
-  - [Qv2ray](https://github.com/Qv2ray/Qv2ray)  (This project had been archived and currently inactive)
-  - [Netch (NetFilter & TUN/TAP)](https://github.com/NetchX/Netch)
-- Android
-  - [v2rayNG](https://github.com/2dust/v2rayNG)
-  - [AnXray](https://github.com/XTLS/AnXray)
-  - [Kitsunebi](https://github.com/rurirei/Kitsunebi/tree/release_xtls)
-- iOS & macOS (with M1 chip)
-  - [Shadowrocket](https://apps.apple.com/app/shadowrocket/id932747118)
-- macOS (Intel chip & M1 chip)
-  - [Qv2ray](https://github.com/Qv2ray/Qv2ray) (This project had been archived and currently inactive)
-
-## Credits
-
-This repo relies on the following third-party projects:
-
-- Special thanks:
-  - [v2fly/v2ray-core](https://github.com/v2fly/v2ray-core)
-- In production:
-  - [gorilla/websocket](https://github.com/gorilla/websocket)
-  - [lucas-clemente/quic-go](https://github.com/lucas-clemente/quic-go)
-  - [pires/go-proxyproto](https://github.com/pires/go-proxyproto)
-  - [seiflotfy/cuckoofilter](https://github.com/seiflotfy/cuckoofilter)
-  - [google/starlark-go](https://github.com/google/starlark-go)
-- For testing only:
-  - [miekg/dns](https://github.com/miekg/dns)
-  - [h12w/socks](https://github.com/h12w/socks)
-
-## Compilation
-
-### Windows
-
-```bash
-go build -o xray.exe -trimpath -ldflags "-s -w -buildid=" ./main
-```
-
-### Linux / macOS
-
-```bash
-go build -o xray -trimpath -ldflags "-s -w -buildid=" ./main
-```
+[Project X Official Website](https://xtls.github.io)
 
 ## Telegram
 
@@ -90,6 +18,133 @@ go build -o xray -trimpath -ldflags "-s -w -buildid=" ./main
 
 [Project X Channel](https://t.me/projectXtls)
 
+## Installation
+
+- 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-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_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)
+  - [Xray_For_Magisk](https://github.com/E7KMbb/Xray_For_Magisk)
+- Homebrew
+  - `brew install xray`
+
+## Usage
+
+- Example
+  - [VLESS-XTLS-uTLS-REALITY](https://github.com/XTLS/REALITY#readme)
+  - [VLESS-TCP-XTLS-Vision](https://github.com/XTLS/Xray-examples/tree/main/VLESS-TCP-XTLS-Vision)
+  - [All-in-One-fallbacks-Nginx](https://github.com/XTLS/Xray-examples/tree/main/All-in-One-fallbacks-Nginx)
+- Xray-examples
+  - [XTLS/Xray-examples](https://github.com/XTLS/Xray-examples)
+  - [chika0801/Xray-examples](https://github.com/chika0801/Xray-examples)
+  - [lxhao61/integrated-examples](https://github.com/lxhao61/integrated-examples)
+- Tutorial
+  - [XTLS Vision](https://github.com/chika0801/Xray-install)
+  - [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
+
+- OpenWrt
+  - [PassWall](https://github.com/xiaorouji/openwrt-passwall), [PassWall 2](https://github.com/xiaorouji/openwrt-passwall2)
+  - [ShadowSocksR Plus+](https://github.com/fw876/helloworld)
+  - [luci-app-xray](https://github.com/yichya/luci-app-xray) ([openwrt-xray](https://github.com/yichya/openwrt-xray))
+- Windows
+  - [v2rayN](https://github.com/2dust/v2rayN)
+  - [NekoRay](https://github.com/Matsuridayo/nekoray)
+  - [Furious](https://github.com/LorenEteval/Furious)
+  - [HiddifyN](https://github.com/hiddify/HiddifyN)
+  - [Invisible Man - Xray](https://github.com/InvisibleManVPN/InvisibleMan-XRayClient)
+- Android
+  - [v2rayNG](https://github.com/2dust/v2rayNG)
+  - [HiddifyNG](https://github.com/hiddify/HiddifyNG)
+  - [X-flutter](https://github.com/XTLS/X-flutter)
+- iOS & macOS arm64
+  - [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)
+  - [Furious](https://github.com/LorenEteval/Furious)
+  - [FoXray](https://apps.apple.com/app/foxray/id6448898396)
+- Linux
+  - [v2rayA](https://github.com/v2rayA/v2rayA)
+  - [NekoRay](https://github.com/Matsuridayo/nekoray)
+  - [Furious](https://github.com/LorenEteval/Furious)
+
+## Others that support VLESS, XTLS, REALITY, XUDP, PLUX...
+
+- 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)
+- [Clash.Meta](https://github.com/MetaCubeX/Clash.Meta)
+  - [Clash Verge](https://github.com/zzzgydi/clash-verge)
+  - [clashN](https://github.com/2dust/clashN)
+  - [Clash Meta for Android](https://github.com/MetaCubeX/ClashMetaForAndroid)
+  - [meta_for_ios](https://t.me/meta_for_ios)
+- [sing-box](https://github.com/SagerNet/sing-box)
+  - [installReality](https://github.com/BoxXt/installReality)
+  - [sbox-reality](https://github.com/Misaka-blog/sbox-reality)
+  - [sing-box-for-ios](https://github.com/SagerNet/sing-box-for-ios)
+
+## Contributing
+
+[Code of Conduct](https://github.com/XTLS/Xray-core/blob/main/CODE_OF_CONDUCT.md)
+
+## Credits
+
+- [Xray-core v1.0.0](https://github.com/XTLS/Xray-core/releases/tag/v1.0.0) was forked from [v2fly-core 9a03cc5](https://github.com/v2fly/v2ray-core/commit/9a03cc5c98d04cc28320fcee26dbc236b3291256), and we have made & accumulated a huge number of enhancements over time, check [the release notes for each version](https://github.com/XTLS/Xray-core/releases).
+- For third-party projects used in [Xray-core](https://github.com/XTLS/Xray-core), check your local or [the latest go.mod](https://github.com/XTLS/Xray-core/blob/main/go.mod).
+
+## Compilation
+
+### Windows (PowerShell)
+
+```powershell
+$env:CGO_ENABLED=0
+go build -o xray.exe -trimpath -ldflags "-s -w -buildid=" ./main
+```
+
+### Linux / macOS
+
+```bash
+CGO_ENABLED=0 go build -o xray -trimpath -ldflags "-s -w -buildid=" ./main
+```
+
+### Reproducible Releases
+
+```bash
+make
+```
+
 ## Stargazers over time
 
 [![Stargazers over time](https://starchart.cc/XTLS/Xray-core.svg)](https://starchart.cc/XTLS/Xray-core)

app/commander/commander.go

@@ -7,12 +7,11 @@ import (
 	"net"
 	"sync"
 
-	"google.golang.org/grpc"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/signal/done"
 	core "github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/outbound"
+	"google.golang.org/grpc"
 )
 
 // Commander is a Xray feature that provides gRPC methods to external clients.

app/commander/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/commander/config.proto
 
 package commander

app/commander/service.go

@@ -3,10 +3,9 @@ package commander
 import (
 	"context"
 
+	"github.com/xtls/xray-core/common"
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/reflection"
-
-	"github.com/xtls/xray-core/common"
 )
 
 // Service is a Commander service.

app/dispatcher/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/dispatcher/config.proto
 
 package dispatcher

app/dispatcher/default.go

@@ -92,13 +92,17 @@ type DefaultDispatcher struct {
 	router routing.Router
 	policy policy.Manager
 	stats  stats.Manager
-	hosts  dns.HostsLookup
+	dns    dns.Client
+	fdns   dns.FakeDNSEngine
 }
 
 func init() {
 	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, config interface{}) (interface{}, error) {
 		d := new(DefaultDispatcher)
 		if err := core.RequireFeatures(ctx, func(om outbound.Manager, router routing.Router, pm policy.Manager, sm stats.Manager, dc dns.Client) error {
+			core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
+				d.fdns = fdns
+			})
 			return d.Init(config.(*Config), om, router, pm, sm, dc)
 		}); err != nil {
 			return nil, err
@@ -108,14 +112,12 @@ func init() {
 }
 
 // Init initializes DefaultDispatcher.
-func (d *DefaultDispatcher) Init(config *Config, om outbound.Manager, router routing.Router, pm policy.Manager, sm stats.Manager, dc dns.Client) error {
+func (d *DefaultDispatcher) Init(config *Config, om outbound.Manager, router routing.Router, pm policy.Manager, sm stats.Manager, dns dns.Client) error {
 	d.ohm = om
 	d.router = router
 	d.policy = pm
 	d.stats = sm
-	if hosts, ok := dc.(dns.HostsLookup); ok {
-		d.hosts = hosts
-	}
+	d.dns = dns
 	return nil
 }
 
@@ -178,27 +180,26 @@ func (d *DefaultDispatcher) getLink(ctx context.Context) (*transport.Link, *tran
 	return inboundLink, outboundLink
 }
 
-func shouldOverride(ctx context.Context, result SniffResult, request session.SniffingRequest, destination net.Destination) bool {
+func (d *DefaultDispatcher) shouldOverride(ctx context.Context, result SniffResult, request session.SniffingRequest, destination net.Destination) bool {
 	domain := result.Domain()
+	if domain == "" {
+		return false
+	}
 	for _, d := range request.ExcludeForDomain {
 		if strings.ToLower(domain) == d {
 			return false
 		}
 	}
-	var fakeDNSEngine dns.FakeDNSEngine
-	core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
-		fakeDNSEngine = fdns
-	})
 	protocolString := result.Protocol()
 	if resComp, ok := result.(SnifferResultComposite); ok {
 		protocolString = resComp.ProtocolForDomainResult()
 	}
 	for _, p := range request.OverrideDestinationForProtocol {
-		if strings.HasPrefix(protocolString, p) {
+		if strings.HasPrefix(protocolString, p) || strings.HasPrefix(p, protocolString) {
 			return true
 		}
-		if fkr0, ok := fakeDNSEngine.(dns.FakeDNSEngineRev0); ok && protocolString != "bittorrent" && p == "fakedns" &&
-			destination.Address.Family().IsIP() && fkr0.IsIPInIPPool(destination.Address) {
+		if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok && protocolString != "bittorrent" && p == "fakedns" &&
+			fkr0.IsIPInIPPool(destination.Address) {
 			newError("Using sniffer ", protocolString, " since the fake DNS missed").WriteToLog(session.ExportIDToError(ctx))
 			return true
 		}
@@ -217,53 +218,46 @@ func (d *DefaultDispatcher) Dispatch(ctx context.Context, destination net.Destin
 	if !destination.IsValid() {
 		panic("Dispatcher: Invalid destination.")
 	}
-	ob := &session.Outbound{
-		Target: destination,
-	}
+	ob := session.OutboundFromContext(ctx)
+	if ob == nil {
+		ob = &session.Outbound{}
 		ctx = session.ContextWithOutbound(ctx, ob)
-
-	inbound, outbound := d.getLink(ctx)
+	}
+	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
-	switch {
-	case !sniffingRequest.Enabled:
+	inbound, outbound := d.getLink(ctx)
+	if !sniffingRequest.Enabled {
 		go d.routedDispatch(ctx, outbound, destination)
-	case destination.Network != net.Network_TCP:
-		// Only metadata sniff will be used for non tcp connection
-		result, err := sniffer(ctx, nil, true)
-		if err == nil {
-			content.Protocol = result.Protocol()
-			if shouldOverride(ctx, result, sniffingRequest, destination) {
-				domain := result.Domain()
-				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
-				destination.Address = net.ParseAddress(domain)
-				if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
-					ob.RouteTarget = destination
 	} else {
-					ob.Target = destination
-				}
-			}
-		}
-		go d.routedDispatch(ctx, outbound, destination)
-	default:
 		go func() {
 			cReader := &cachedReader{
 				reader: outbound.Reader.(*pipe.Reader),
 			}
 			outbound.Reader = cReader
-			result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly)
+			result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly, destination.Network)
 			if err == nil {
 				content.Protocol = result.Protocol()
 			}
-			if err == nil && shouldOverride(ctx, result, sniffingRequest, destination) {
+			if err == nil && d.shouldOverride(ctx, result, sniffingRequest, destination) {
 				domain := result.Domain()
 				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
 				destination.Address = net.ParseAddress(domain)
-				if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
+				protocol := result.Protocol()
+				if resComp, ok := result.(SnifferResultComposite); ok {
+					protocol = resComp.ProtocolForDomainResult()
+				}
+				isFakeIP := false
+				if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok && fkr0.IsIPInIPPool(ob.Target.Address) {
+					isFakeIP = true
+				}
+				if sniffingRequest.RouteOnly && protocol != "fakedns" && protocol != "fakedns+others" && !isFakeIP {
 					ob.RouteTarget = destination
 				} else {
 					ob.Target = destination
@@ -280,63 +274,55 @@ func (d *DefaultDispatcher) DispatchLink(ctx context.Context, destination net.De
 	if !destination.IsValid() {
 		return newError("Dispatcher: Invalid destination.")
 	}
-	ob := &session.Outbound{
-		Target: destination,
-	}
+	ob := session.OutboundFromContext(ctx)
+	if ob == nil {
+		ob = &session.Outbound{}
 		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
-	switch {
-	case !sniffingRequest.Enabled:
-		go d.routedDispatch(ctx, outbound, destination)
-	case destination.Network != net.Network_TCP:
-		// Only metadata sniff will be used for non tcp connection
-		result, err := sniffer(ctx, nil, true)
-		if err == nil {
-			content.Protocol = result.Protocol()
-			if shouldOverride(ctx, result, sniffingRequest, destination) {
-				domain := result.Domain()
-				newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
-				destination.Address = net.ParseAddress(domain)
-				if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
-					ob.RouteTarget = destination
+	if !sniffingRequest.Enabled {
+		d.routedDispatch(ctx, outbound, destination)
 	} else {
-					ob.Target = destination
-				}
-			}
-		}
-		go d.routedDispatch(ctx, outbound, destination)
-	default:
-		go func() {
 		cReader := &cachedReader{
 			reader: outbound.Reader.(*pipe.Reader),
 		}
 		outbound.Reader = cReader
-			result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly)
+		result, err := sniffer(ctx, cReader, sniffingRequest.MetadataOnly, destination.Network)
 		if err == nil {
 			content.Protocol = result.Protocol()
 		}
-			if err == nil && shouldOverride(ctx, result, sniffingRequest, destination) {
+		if err == nil && d.shouldOverride(ctx, result, sniffingRequest, destination) {
 			domain := result.Domain()
 			newError("sniffed domain: ", domain).WriteToLog(session.ExportIDToError(ctx))
 			destination.Address = net.ParseAddress(domain)
-				if sniffingRequest.RouteOnly && result.Protocol() != "fakedns" {
+			protocol := result.Protocol()
+			if resComp, ok := result.(SnifferResultComposite); ok {
+				protocol = resComp.ProtocolForDomainResult()
+			}
+			isFakeIP := false
+			if fkr0, ok := d.fdns.(dns.FakeDNSEngineRev0); ok && fkr0.IsIPInIPPool(ob.Target.Address) {
+				isFakeIP = true
+			}
+			if sniffingRequest.RouteOnly && protocol != "fakedns" && protocol != "fakedns+others" && !isFakeIP {
 				ob.RouteTarget = destination
 			} else {
 				ob.Target = destination
 			}
 		}
 		d.routedDispatch(ctx, outbound, destination)
-		}()
 	}
+
 	return nil
 }
 
-func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (SniffResult, error) {
+func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool, network net.Network) (SniffResult, error) {
 	payload := buf.New()
 	defer payload.Release()
 
@@ -362,7 +348,7 @@ func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (Sni
 
 				cReader.Cache(payload)
 				if !payload.IsEmpty() {
-					result, err := sniffer.Sniff(ctx, payload.Bytes())
+					result, err := sniffer.Sniff(ctx, payload.Bytes(), network)
 					if err != common.ErrNoClue {
 						return result, err
 					}
@@ -381,11 +367,10 @@ func sniffer(ctx context.Context, cReader *cachedReader, metadataOnly bool) (Sni
 	}
 	return contentResult, contentErr
 }
-
 func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.Link, destination net.Destination) {
 	ob := session.OutboundFromContext(ctx)
-	if d.hosts != nil && destination.Address.Family().IsDomain() {
-		proxied := d.hosts.LookupHosts(ob.Target.String())
+	if hosts, ok := d.dns.(dns.HostsLookup); ok && destination.Address.Family().IsDomain() {
+		proxied := hosts.LookupHosts(ob.Target.String())
 		if proxied != nil {
 			ro := ob.RouteTarget == destination
 			destination.Address = *proxied
@@ -399,9 +384,13 @@ func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.
 
 	var handler outbound.Handler
 
+	routingLink := routing_session.AsRoutingContext(ctx)
+	inTag := routingLink.GetInboundTag()
+	isPickRoute := 0
 	if forcedOutboundTag := session.GetForcedOutboundTagFromContext(ctx); forcedOutboundTag != "" {
 		ctx = session.SetForcedOutboundTagToContext(ctx, "")
 		if h := d.ohm.GetHandler(forcedOutboundTag); h != nil {
+			isPickRoute = 1
 			newError("taking platform initialized detour [", forcedOutboundTag, "] for [", destination, "]").WriteToLog(session.ExportIDToError(ctx))
 			handler = h
 		} else {
@@ -411,13 +400,14 @@ func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.
 			return
 		}
 	} else if d.router != nil {
-		if route, err := d.router.PickRoute(routing_session.AsRoutingContext(ctx)); err == nil {
-			tag := route.GetOutboundTag()
-			if h := d.ohm.GetHandler(tag); h != nil {
-				newError("taking detour [", tag, "] for [", destination, "]").WriteToLog(session.ExportIDToError(ctx))
+		if route, err := d.router.PickRoute(routingLink); err == nil {
+			outTag := route.GetOutboundTag()
+			if h := d.ohm.GetHandler(outTag); h != nil {
+				isPickRoute = 2
+				newError("taking detour [", outTag, "] for [", destination, "]").WriteToLog(session.ExportIDToError(ctx))
 				handler = h
 			} else {
-				newError("non existing outTag: ", tag).AtWarning().WriteToLog(session.ExportIDToError(ctx))
+				newError("non existing outTag: ", outTag).AtWarning().WriteToLog(session.ExportIDToError(ctx))
 			}
 		} else {
 			newError("default route for ", destination).WriteToLog(session.ExportIDToError(ctx))
@@ -437,7 +427,15 @@ func (d *DefaultDispatcher) routedDispatch(ctx context.Context, link *transport.
 
 	if accessMessage := log.AccessMessageFromContext(ctx); accessMessage != nil {
 		if tag := handler.Tag(); tag != "" {
+			if inTag == "" {
 				accessMessage.Detour = tag
+			} else if isPickRoute == 1 {
+				accessMessage.Detour = inTag + " ==> " + tag
+			} else if isPickRoute == 2 {
+				accessMessage.Detour = inTag + " -> " + tag
+			} else {
+				accessMessage.Detour = inTag + " >> " + tag
+			}
 		}
 		log.Record(accessMessage)
 	}

app/dispatcher/fakednssniffer.go

@@ -14,12 +14,13 @@ import (
 // newFakeDNSSniffer Creates a Fake DNS metadata sniffer
 func newFakeDNSSniffer(ctx context.Context) (protocolSnifferWithMetadata, error) {
 	var fakeDNSEngine dns.FakeDNSEngine
-	err := core.RequireFeatures(ctx, func(fdns dns.FakeDNSEngine) {
-		fakeDNSEngine = fdns
-	})
-	if err != nil {
-		return protocolSnifferWithMetadata{}, err
+	{
+		fakeDNSEngineFeat := core.MustFromContext(ctx).GetFeature((*dns.FakeDNSEngine)(nil))
+		if fakeDNSEngineFeat != nil {
+			fakeDNSEngine = fakeDNSEngineFeat.(dns.FakeDNSEngine)
 		}
+	}
+
 	if fakeDNSEngine == nil {
 		errNotInit := newError("FakeDNSEngine is not initialized, but such a sniffer is used").AtError()
 		return protocolSnifferWithMetadata{}, errNotInit
@@ -84,7 +85,8 @@ func (f DNSThenOthersSniffResult) Domain() string {
 }
 
 func newFakeDNSThenOthers(ctx context.Context, fakeDNSSniffer protocolSnifferWithMetadata, others []protocolSnifferWithMetadata) (
-	protocolSnifferWithMetadata, error) { // nolint: unparam
+	protocolSnifferWithMetadata, error,
+) { // nolint: unparam
 	// ctx may be used in the future
 	_ = ctx
 	return protocolSnifferWithMetadata{

app/dispatcher/sniffer.go

@@ -4,8 +4,10 @@ import (
 	"context"
 
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/protocol/bittorrent"
 	"github.com/xtls/xray-core/common/protocol/http"
+	"github.com/xtls/xray-core/common/protocol/quic"
 	"github.com/xtls/xray-core/common/protocol/tls"
 )
 
@@ -22,6 +24,7 @@ type protocolSnifferWithMetadata struct {
 	// for both TCP and UDP connections
 	// It will not be shown as a traffic type for routing unless there is no other successful sniffing.
 	metadataSniffer bool
+	network         net.Network
 }
 
 type Sniffer struct {
@@ -31,9 +34,11 @@ type Sniffer struct {
 func NewSniffer(ctx context.Context) *Sniffer {
 	ret := &Sniffer{
 		sniffer: []protocolSnifferWithMetadata{
-			{func(c context.Context, b []byte) (SniffResult, error) { return http.SniffHTTP(b) }, false},
-			{func(c context.Context, b []byte) (SniffResult, error) { return tls.SniffTLS(b) }, false},
-			{func(c context.Context, b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) }, false},
+			{func(c context.Context, b []byte) (SniffResult, error) { return http.SniffHTTP(b) }, false, net.Network_TCP},
+			{func(c context.Context, b []byte) (SniffResult, error) { return tls.SniffTLS(b) }, false, net.Network_TCP},
+			{func(c context.Context, b []byte) (SniffResult, error) { return bittorrent.SniffBittorrent(b) }, false, net.Network_TCP},
+			{func(c context.Context, b []byte) (SniffResult, error) { return quic.SniffQUIC(b) }, false, net.Network_UDP},
+			{func(c context.Context, b []byte) (SniffResult, error) { return bittorrent.SniffUTP(b) }, false, net.Network_UDP},
 		},
 	}
 	if sniffer, err := newFakeDNSSniffer(ctx); err == nil {
@@ -49,11 +54,11 @@ func NewSniffer(ctx context.Context) *Sniffer {
 
 var errUnknownContent = newError("unknown content")
 
-func (s *Sniffer) Sniff(c context.Context, payload []byte) (SniffResult, error) {
+func (s *Sniffer) Sniff(c context.Context, payload []byte, network net.Network) (SniffResult, error) {
 	var pendingSniffer []protocolSnifferWithMetadata
 	for _, si := range s.sniffer {
 		s := si.protocolSniffer
-		if si.metadataSniffer {
+		if si.metadataSniffer || si.network != network {
 			continue
 		}
 		result, err := s(c, payload)

app/dns/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/dns/config.proto
 
 package dns
@@ -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
@@ -219,14 +227,14 @@ type Config struct {
 	// the moment. A special value 'localhost' as a domain address can be set to
 	// use DNS on local system.
 	//
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in app/dns/config.proto.
 	NameServers []*net.Endpoint `protobuf:"bytes,1,rep,name=NameServers,proto3" json:"NameServers,omitempty"`
 	// NameServer list used by this DNS client.
 	NameServer []*NameServer `protobuf:"bytes,5,rep,name=name_server,json=nameServer,proto3" json:"name_server,omitempty"`
 	// Static hosts. Domain to IP.
 	// Deprecated. Use static_hosts.
 	//
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in app/dns/config.proto.
 	Hosts map[string]*net.IPOrDomain `protobuf:"bytes,2,rep,name=Hosts,proto3" json:"Hosts,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	// Client IP for EDNS client subnet. Must be 4 bytes (IPv4) or 16 bytes
 	// (IPv6).
@@ -273,7 +281,7 @@ func (*Config) Descriptor() ([]byte, []int) {
 	return file_app_dns_config_proto_rawDescGZIP(), []int{1}
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in app/dns/config.proto.
 func (x *Config) GetNameServers() []*net.Endpoint {
 	if x != nil {
 		return x.NameServers
@@ -288,7 +296,7 @@ func (x *Config) GetNameServer() []*NameServer {
 	return nil
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in app/dns/config.proto.
 func (x *Config) GetHosts() map[string]*net.IPOrDomain {
 	if x != nil {
 		return x.Hosts
@@ -538,7 +546,7 @@ var file_app_dns_config_proto_rawDesc = []byte{
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+	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 {
+		// 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/dns_test.go

@@ -6,7 +6,6 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/miekg/dns"
-
 	"github.com/xtls/xray-core/app/dispatcher"
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/app/policy"
@@ -14,6 +13,7 @@ import (
 	_ "github.com/xtls/xray-core/app/proxyman/outbound"
 	"github.com/xtls/xray-core/app/router"
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/errors"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/serial"
 	"github.com/xtls/xray-core/core"
@@ -261,7 +261,7 @@ func TestUDPServer(t *testing.T) {
 			IPv6Enable: true,
 			FakeEnable: false,
 		})
-		if err != feature_dns.ErrEmptyResponse {
+		if !errors.AllEqual(feature_dns.ErrEmptyResponse, errors.Cause(err)) {
 			t.Fatal("error: ", err)
 		}
 		if len(ips) != 0 {

app/dns/dnscommon.go

@@ -1,16 +1,19 @@
 package dns
 
 import (
+	"context"
 	"encoding/binary"
 	"strings"
 	"time"
 
-	"golang.org/x/net/dns/dnsmessage"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
+	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/session"
+	"github.com/xtls/xray-core/core"
 	dns_feature "github.com/xtls/xray-core/features/dns"
+	"golang.org/x/net/dns/dnsmessage"
 )
 
 // Fqdn normalizes domain make sure it ends with '.'
@@ -226,3 +229,19 @@ L:
 
 	return ipRecord, nil
 }
+
+// toDnsContext create a new background context with parent inbound, session and dns log
+func toDnsContext(ctx context.Context, addr string) context.Context {
+	dnsCtx := core.ToBackgroundDetachedContext(ctx)
+	if inbound := session.InboundFromContext(ctx); inbound != nil {
+		dnsCtx = session.ContextWithInbound(dnsCtx, inbound)
+	}
+	dnsCtx = session.ContextWithContent(dnsCtx, session.ContentFromContext(ctx))
+	dnsCtx = log.ContextWithAccessMessage(dnsCtx, &log.AccessMessage{
+		From:   "DNS",
+		To:     addr,
+		Status: log.AccessAccepted,
+		Reason: "",
+	})
+	return dnsCtx
+}

app/dns/dnscommon_test.go

@@ -7,11 +7,10 @@ import (
 
 	"github.com/google/go-cmp/cmp"
 	"github.com/miekg/dns"
-	"golang.org/x/net/dns/dnsmessage"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
 	dns_feature "github.com/xtls/xray-core/features/dns"
+	"golang.org/x/net/dns/dnsmessage"
 )
 
 func Test_parseResponse(t *testing.T) {

app/dns/fakedns/fakedns.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/dns/fakedns/fakedns.proto
 
 package fakedns

app/dns/fakedns/fakedns_test.go

@@ -6,13 +6,11 @@ import (
 	"testing"
 
 	"github.com/stretchr/testify/assert"
-
-	"golang.org/x/sync/errgroup"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/uuid"
 	"github.com/xtls/xray-core/features/dns"
+	"golang.org/x/sync/errgroup"
 )
 
 var ipPrefix = "198.1"

app/dns/hosts_test.go

@@ -4,7 +4,6 @@ import (
 	"testing"
 
 	"github.com/google/go-cmp/cmp"
-
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"

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

@@ -11,8 +11,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"golang.org/x/net/dns/dnsmessage"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
@@ -24,6 +22,7 @@ import (
 	dns_feature "github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/transport/internet"
+	"golang.org/x/net/dns/dnsmessage"
 )
 
 // DoHNameServer implemented DNS over HTTPS (RFC8484) Wire Format,
@@ -39,12 +38,13 @@ type DoHNameServer struct {
 	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{
@@ -53,23 +53,11 @@ func NewDoHNameServer(url *url.URL, dispatcher routing.Dispatcher) (*DoHNameServ
 		TLSHandshakeTimeout: 30 * time.Second,
 		ForceAttemptHTTP2:   true,
 		DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
-			dispatcherCtx := context.Background()
-
 			dest, err := net.ParseDestination(network + ":" + addr)
 			if err != nil {
 				return nil, err
 			}
-
-			dispatcherCtx = session.ContextWithContent(dispatcherCtx, session.ContentFromContext(ctx))
-			dispatcherCtx = session.ContextWithInbound(dispatcherCtx, session.InboundFromContext(ctx))
-			dispatcherCtx = log.ContextWithAccessMessage(dispatcherCtx, &log.AccessMessage{
-				From:   "DoH",
-				To:     s.dohURL,
-				Status: log.AccessAccepted,
-				Reason: "",
-			})
-
-			link, err := s.dispatcher.Dispatch(dispatcherCtx, dest)
+			link, err := s.dispatcher.Dispatch(toDnsContext(ctx, s.dohURL), dest)
 			select {
 			case <-ctx.Done():
 				return nil, ctx.Err()
@@ -103,9 +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,
@@ -116,7 +104,7 @@ func NewDoHLocalNameServer(url *url.URL) *DoHNameServer {
 			}
 			conn, err := internet.DialSystem(ctx, dest, nil)
 			log.Record(&log.AccessMessage{
-				From:   "DoH",
+				From:   "DNS",
 				To:     s.dohURL,
 				Status: log.AccessAccepted,
 				Detour: "local",
@@ -135,12 +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(),
+		queryStrategy: queryStrategy,
 	}
 	s.cleanup = &task.Periodic{
 		Interval: time.Minute,
@@ -366,6 +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

@@ -7,7 +7,6 @@ import (
 	"time"
 
 	"github.com/google/go-cmp/cmp"
-
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
@@ -18,7 +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,
@@ -35,7 +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,
@@ -58,3 +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_local.go

@@ -3,7 +3,9 @@ package dns
 import (
 	"context"
 	"strings"
+	"time"
 
+	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/dns/localdns"
@@ -18,6 +20,7 @@ const errEmptyResponse = "No address associated with hostname"
 
 // QueryIP implements Server.
 func (s *LocalNameServer) QueryIP(_ context.Context, domain string, _ net.IP, option dns.IPOption, _ bool) (ips []net.IP, err error) {
+	start := time.Now()
 	ips, err = s.client.LookupIP(domain, option)
 
 	if err != nil && strings.HasSuffix(err.Error(), errEmptyResponse) {
@@ -26,6 +29,7 @@ func (s *LocalNameServer) QueryIP(_ context.Context, domain string, _ net.IP, op
 
 	if len(ips) > 0 {
 		newError("Localhost got answer: ", domain, " -> ", ips).AtInfo().WriteToLog()
+		log.Record(&log.DNSLog{Server: s.Name(), Domain: domain, Result: ips, Status: log.DNSQueried, Elapsed: time.Since(start), Error: err})
 	}
 
 	return

app/dns/nameserver_quic.go

@@ -1,18 +1,18 @@
 package dns
 
 import (
+	"bytes"
 	"context"
+	"encoding/binary"
 	"net/url"
 	"sync"
 	"sync/atomic"
 	"time"
 
-	"github.com/lucas-clemente/quic-go"
-	"golang.org/x/net/dns/dnsmessage"
-	"golang.org/x/net/http2"
-
+	"github.com/quic-go/quic-go"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
+	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/protocol/dns"
 	"github.com/xtls/xray-core/common/session"
@@ -20,11 +20,13 @@ import (
 	"github.com/xtls/xray-core/common/task"
 	dns_feature "github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/transport/internet/tls"
+	"golang.org/x/net/dns/dnsmessage"
+	"golang.org/x/net/http2"
 )
 
 // 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
 
@@ -37,15 +39,16 @@ type QUICNameServer struct {
 	reqID         uint32
 	name          string
 	destination   *net.Destination
-	session     quic.Session
+	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
-	port := net.Port(784)
+	port := net.Port(853)
 	if url.Port() != "" {
 		port, err = net.PortFromString(url.Port())
 		if err != nil {
@@ -59,6 +62,7 @@ func NewQUICNameServer(url *url.URL) (*QUICNameServer, error) {
 		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 session").Base(err).AtError().WriteToLog()
+				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()
@@ -276,6 +301,7 @@ func (s *QUICNameServer) QueryIP(ctx context.Context, domain string, clientIP ne
 		ips, err := s.findIPsForDomain(fqdn, option)
 		if err != errRecordNotFound {
 			newError(s.name, " cache HIT ", domain, " -> ", ips).Base(err).AtDebug().WriteToLog()
+			log.Record(&log.DNSLog{Server: s.name, Domain: domain, Result: ips, Status: log.DNSCacheHit, Elapsed: 0, Error: err})
 			return ips, err
 		}
 	}
@@ -307,10 +333,12 @@ func (s *QUICNameServer) QueryIP(ctx context.Context, domain string, clientIP ne
 		close(done)
 	}()
 	s.sendQuery(ctx, fqdn, clientIP, option)
+	start := time.Now()
 
 	for {
 		ips, err := s.findIPsForDomain(fqdn, option)
 		if err != errRecordNotFound {
+			log.Record(&log.DNSLog{Server: s.name, Domain: domain, Result: ips, Status: log.DNSQueried, Elapsed: time.Since(start), Error: err})
 			return ips, err
 		}
 
@@ -322,7 +350,7 @@ func (s *QUICNameServer) QueryIP(ctx context.Context, domain string, clientIP ne
 	}
 }
 
-func isActive(s quic.Session) bool {
+func isActive(s quic.Connection) bool {
 	select {
 	case <-s.Context().Done():
 		return false
@@ -331,17 +359,17 @@ func isActive(s quic.Session) bool {
 	}
 }
 
-func (s *QUICNameServer) getSession() (quic.Session, error) {
-	var session quic.Session
+func (s *QUICNameServer) getConnection() (quic.Connection, error) {
+	var conn quic.Connection
 	s.RLock()
-	session = s.session
-	if session != nil && isActive(session) {
+	conn = s.connection
+	if conn != nil && isActive(conn) {
 		s.RUnlock()
-		return session, nil
+		return conn, nil
 	}
-	if session != nil {
-		// we're recreating the session, let's create a new one
-		_ = session.CloseWithError(0, "")
+	if conn != nil {
+		// we're recreating the connection, let's create a new one
+		_ = conn.CloseWithError(0, "")
 	}
 	s.RUnlock()
 
@@ -349,42 +377,48 @@ func (s *QUICNameServer) getSession() (quic.Session, error) {
 	defer s.Unlock()
 
 	var err error
-	session, err = s.openSession()
+	conn, err = s.openConnection()
 	if err != nil {
 		// This does not look too nice, but QUIC (or maybe quic-go)
 		// doesn't seem stable enough.
 		// Maybe retransmissions aren't fully implemented in quic-go?
 		// Anyways, the simple solution is to make a second try when
-		// it fails to open the QUIC session.
-		session, err = s.openSession()
+		// it fails to open the QUIC connection.
+		conn, err = s.openConnection()
 		if err != nil {
 			return nil, err
 		}
 	}
-	s.session = session
-	return session, nil
+	s.connection = conn
+	return conn, nil
 }
 
-func (s *QUICNameServer) openSession() (quic.Session, error) {
+func (s *QUICNameServer) openConnection() (quic.Connection, error) {
 	tlsConfig := tls.Config{}
 	quicConfig := &quic.Config{
 		HandshakeIdleTimeout: handshakeTimeout,
 	}
-
-	session, err := quic.DialAddrContext(context.Background(), s.destination.NetAddr(), tlsConfig.GetTLSConfig(tls.WithNextProto("http/1.1", http2.NextProtoTLS, NextProtoDQ)), quicConfig)
+	tlsConfig.ServerName = s.destination.Address.String()
+	conn, err := quic.DialAddr(context.Background(), s.destination.NetAddr(), tlsConfig.GetTLSConfig(tls.WithNextProto("http/1.1", http2.NextProtoTLS, NextProtoDQ)), quicConfig)
+	log.Record(&log.AccessMessage{
+		From:   "DNS",
+		To:     s.destination,
+		Status: log.AccessAccepted,
+		Detour: "local",
+	})
 	if err != nil {
 		return nil, err
 	}
 
-	return session, nil
+	return conn, nil
 }
 
 func (s *QUICNameServer) openStream(ctx context.Context) (quic.Stream, error) {
-	session, err := s.getSession()
+	conn, err := s.getConnection()
 	if err != nil {
 		return nil, err
 	}
 
 	// open a new stream
-	return session.OpenStreamSync(ctx)
+	return conn.OpenStreamSync(ctx)
 }

app/dns/nameserver_quic_test.go

@@ -7,7 +7,6 @@ import (
 	"time"
 
 	"github.com/google/go-cmp/cmp"
-
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
@@ -17,7 +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{
@@ -41,3 +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

@@ -9,10 +9,9 @@ import (
 	"sync/atomic"
 	"time"
 
-	"golang.org/x/net/dns/dnsmessage"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
+	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/net/cnc"
 	"github.com/xtls/xray-core/common/protocol/dns"
@@ -22,6 +21,7 @@ import (
 	dns_feature "github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/transport/internet"
+	"golang.org/x/net/dns/dnsmessage"
 )
 
 // TCPNameServer implemented DNS over TCP (RFC7766).
@@ -34,17 +34,22 @@ type TCPNameServer struct {
 	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
 	}
 
 	s.dial = func(ctx context.Context) (net.Conn, error) {
-		link, err := dispatcher.Dispatch(ctx, *s.destination)
+		link, err := dispatcher.Dispatch(toDnsContext(ctx, s.destination.String()), *s.destination)
 		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
 	}
@@ -72,12 +77,11 @@ 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
 		}
 	}
@@ -88,6 +92,7 @@ func baseTCPNameServer(url *url.URL, prefix string) (*TCPNameServer, error) {
 		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()
@@ -315,6 +324,7 @@ func (s *TCPNameServer) QueryIP(ctx context.Context, domain string, clientIP net
 		ips, err := s.findIPsForDomain(fqdn, option)
 		if err != errRecordNotFound {
 			newError(s.name, " cache HIT ", domain, " -> ", ips).Base(err).AtDebug().WriteToLog()
+			log.Record(&log.DNSLog{Server: s.name, Domain: domain, Result: ips, Status: log.DNSCacheHit, Elapsed: 0, Error: err})
 			return ips, err
 		}
 	}
@@ -346,10 +356,12 @@ func (s *TCPNameServer) QueryIP(ctx context.Context, domain string, clientIP net
 		close(done)
 	}()
 	s.sendQuery(ctx, fqdn, clientIP, option)
+	start := time.Now()
 
 	for {
 		ips, err := s.findIPsForDomain(fqdn, option)
 		if err != errRecordNotFound {
+			log.Record(&log.DNSLog{Server: s.name, Domain: domain, Result: ips, Status: log.DNSQueried, Elapsed: time.Since(start), Error: err})
 			return ips, err
 		}
 

app/dns/nameserver_tcp_test.go

@@ -7,7 +7,6 @@ import (
 	"time"
 
 	"github.com/google/go-cmp/cmp"
-
 	. "github.com/xtls/xray-core/app/dns"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
@@ -17,7 +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{
@@ -34,7 +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{
@@ -58,3 +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/dns/nameserver_udp.go

@@ -7,8 +7,6 @@ import (
 	"sync/atomic"
 	"time"
 
-	"golang.org/x/net/dns/dnsmessage"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/log"
 	"github.com/xtls/xray-core/common/net"
@@ -17,10 +15,10 @@ import (
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/common/signal/pubsub"
 	"github.com/xtls/xray-core/common/task"
-	"github.com/xtls/xray-core/core"
 	dns_feature "github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/transport/internet/udp"
+	"golang.org/x/net/dns/dnsmessage"
 )
 
 // ClassicNameServer implemented traditional UDP DNS.
@@ -196,21 +194,7 @@ func (s *ClassicNameServer) sendQuery(ctx context.Context, domain string, client
 	for _, req := range reqs {
 		s.addPendingRequest(req)
 		b, _ := dns.PackMessage(req.msg)
-		udpCtx := core.ToBackgroundDetachedContext(ctx)
-		if inbound := session.InboundFromContext(ctx); inbound != nil {
-			udpCtx = session.ContextWithInbound(udpCtx, inbound)
-		}
-
-		udpCtx = session.ContextWithContent(udpCtx, &session.Content{
-			Protocol: "dns",
-		})
-		udpCtx = log.ContextWithAccessMessage(udpCtx, &log.AccessMessage{
-			From:   "DNS",
-			To:     s.address,
-			Status: log.AccessAccepted,
-			Reason: "",
-		})
-		s.udpServer.Dispatch(udpCtx, *s.address, b)
+		s.udpServer.Dispatch(toDnsContext(ctx, s.address.String()), *s.address, b)
 	}
 }
 

app/log/command/command.go

@@ -5,11 +5,10 @@ package command
 import (
 	"context"
 
-	grpc "google.golang.org/grpc"
-
 	"github.com/xtls/xray-core/app/log"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/core"
+	grpc "google.golang.org/grpc"
 )
 
 type LoggerServer struct {

app/log/command/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/log/command/config.proto
 
 package command

app/log/command/config_grpc.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
-// - protoc-gen-go-grpc v1.2.0
-// - protoc             v3.18.0
+// - protoc-gen-go-grpc v1.3.0
+// - protoc             v4.23.1
 // source: app/log/command/config.proto
 
 package command
@@ -18,6 +18,10 @@ import (
 // Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
+const (
+	LoggerService_RestartLogger_FullMethodName = "/xray.app.log.command.LoggerService/RestartLogger"
+)
+
 // LoggerServiceClient is the client API for LoggerService service.
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
@@ -35,7 +39,7 @@ func NewLoggerServiceClient(cc grpc.ClientConnInterface) LoggerServiceClient {
 
 func (c *loggerServiceClient) RestartLogger(ctx context.Context, in *RestartLoggerRequest, opts ...grpc.CallOption) (*RestartLoggerResponse, error) {
 	out := new(RestartLoggerResponse)
-	err := c.cc.Invoke(ctx, "/xray.app.log.command.LoggerService/RestartLogger", in, out, opts...)
+	err := c.cc.Invoke(ctx, LoggerService_RestartLogger_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -80,7 +84,7 @@ func _LoggerService_RestartLogger_Handler(srv interface{}, ctx context.Context,
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/xray.app.log.command.LoggerService/RestartLogger",
+		FullMethod: LoggerService_RestartLogger_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(LoggerServiceServer).RestartLogger(ctx, req.(*RestartLoggerRequest))

app/log/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/log/config.proto
 
 package log

app/log/log_test.go

@@ -5,7 +5,6 @@ import (
 	"testing"
 
 	"github.com/golang/mock/gomock"
-
 	"github.com/xtls/xray-core/app/log"
 	"github.com/xtls/xray-core/common"
 	clog "github.com/xtls/xray-core/common/log"

app/metrics/config.pb.go

@@ -0,0 +1,149 @@
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
+// source: app/metrics/config.proto
+
+package metrics
+
+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)
+)
+
+// Config is the settings for metrics.
+type Config struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// Tag of the outbound handler that handles metrics http connections.
+	Tag string `protobuf:"bytes,1,opt,name=tag,proto3" json:"tag,omitempty"`
+}
+
+func (x *Config) Reset() {
+	*x = Config{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_app_metrics_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_metrics_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_metrics_config_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Config) GetTag() string {
+	if x != nil {
+		return x.Tag
+	}
+	return ""
+}
+
+var File_app_metrics_config_proto protoreflect.FileDescriptor
+
+var file_app_metrics_config_proto_rawDesc = []byte{
+	0x0a, 0x18, 0x61, 0x70, 0x70, 0x2f, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x2f, 0x63, 0x6f,
+	0x6e, 0x66, 0x69, 0x67, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x10, 0x78, 0x72, 0x61, 0x79,
+	0x2e, 0x61, 0x70, 0x70, 0x2e, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x22, 0x1a, 0x0a, 0x06,
+	0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x10, 0x0a, 0x03, 0x74, 0x61, 0x67, 0x18, 0x01, 0x20,
+	0x01, 0x28, 0x09, 0x52, 0x03, 0x74, 0x61, 0x67, 0x42, 0x52, 0x0a, 0x14, 0x63, 0x6f, 0x6d, 0x2e,
+	0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73,
+	0x50, 0x01, 0x5a, 0x25, 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, 0x6d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0xaa, 0x02, 0x10, 0x58, 0x72, 0x61, 0x79,
+	0x2e, 0x41, 0x70, 0x70, 0x2e, 0x4d, 0x65, 0x74, 0x72, 0x69, 0x63, 0x73, 0x62, 0x06, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_app_metrics_config_proto_rawDescOnce sync.Once
+	file_app_metrics_config_proto_rawDescData = file_app_metrics_config_proto_rawDesc
+)
+
+func file_app_metrics_config_proto_rawDescGZIP() []byte {
+	file_app_metrics_config_proto_rawDescOnce.Do(func() {
+		file_app_metrics_config_proto_rawDescData = protoimpl.X.CompressGZIP(file_app_metrics_config_proto_rawDescData)
+	})
+	return file_app_metrics_config_proto_rawDescData
+}
+
+var file_app_metrics_config_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_app_metrics_config_proto_goTypes = []interface{}{
+	(*Config)(nil), // 0: xray.app.metrics.Config
+}
+var file_app_metrics_config_proto_depIdxs = []int32{
+	0, // [0:0] is the sub-list for method output_type
+	0, // [0:0] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_app_metrics_config_proto_init() }
+func file_app_metrics_config_proto_init() {
+	if File_app_metrics_config_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_app_metrics_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
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_app_metrics_config_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   0,
+		},
+		GoTypes:           file_app_metrics_config_proto_goTypes,
+		DependencyIndexes: file_app_metrics_config_proto_depIdxs,
+		MessageInfos:      file_app_metrics_config_proto_msgTypes,
+	}.Build()
+	File_app_metrics_config_proto = out.File
+	file_app_metrics_config_proto_rawDesc = nil
+	file_app_metrics_config_proto_goTypes = nil
+	file_app_metrics_config_proto_depIdxs = nil
+}

app/metrics/config.proto

@@ -0,0 +1,13 @@
+syntax = "proto3";
+
+package xray.app.metrics;
+option csharp_namespace = "Xray.App.Metrics";
+option go_package = "github.com/xtls/xray-core/app/metrics";
+option java_package = "com.xray.app.metrics";
+option java_multiple_files = true;
+
+// Config is the settings for metrics.
+message Config {
+  // Tag of the outbound handler that handles metrics http connections.
+  string tag = 1;
+}

app/metrics/errors.generated.go

@@ -1,4 +1,4 @@
-package mtproto
+package metrics
 
 import "github.com/xtls/xray-core/common/errors"
 

app/metrics/metrics.go

@@ -0,0 +1,118 @@
+package metrics
+
+import (
+	"context"
+	"expvar"
+	"net/http"
+	_ "net/http/pprof"
+	"strings"
+
+	"github.com/xtls/xray-core/app/observatory"
+	"github.com/xtls/xray-core/app/stats"
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/signal/done"
+	"github.com/xtls/xray-core/core"
+	"github.com/xtls/xray-core/features/extension"
+	"github.com/xtls/xray-core/features/outbound"
+	feature_stats "github.com/xtls/xray-core/features/stats"
+)
+
+type MetricsHandler struct {
+	ohm          outbound.Manager
+	statsManager feature_stats.Manager
+	observatory  extension.Observatory
+	tag          string
+}
+
+// NewMetricsHandler creates a new MetricsHandler based on the given config.
+func NewMetricsHandler(ctx context.Context, config *Config) (*MetricsHandler, error) {
+	c := &MetricsHandler{
+		tag: config.Tag,
+	}
+	common.Must(core.RequireFeatures(ctx, func(om outbound.Manager, sm feature_stats.Manager) {
+		c.statsManager = sm
+		c.ohm = om
+	}))
+	expvar.Publish("stats", expvar.Func(func() interface{} {
+		manager, ok := c.statsManager.(*stats.Manager)
+		if !ok {
+			return nil
+		}
+		resp := map[string]map[string]map[string]int64{
+			"inbound":  {},
+			"outbound": {},
+			"user":     {},
+		}
+		manager.VisitCounters(func(name string, counter feature_stats.Counter) bool {
+			nameSplit := strings.Split(name, ">>>")
+			typeName, tagOrUser, direction := nameSplit[0], nameSplit[1], nameSplit[3]
+			if item, found := resp[typeName][tagOrUser]; found {
+				item[direction] = counter.Value()
+			} else {
+				resp[typeName][tagOrUser] = map[string]int64{
+					direction: counter.Value(),
+				}
+			}
+			return true
+		})
+		return resp
+	}))
+	expvar.Publish("observatory", expvar.Func(func() interface{} {
+		if c.observatory == nil {
+			common.Must(core.RequireFeatures(ctx, func(observatory extension.Observatory) error {
+				c.observatory = observatory
+				return nil
+			}))
+			if c.observatory == nil {
+				return nil
+			}
+		}
+		resp := map[string]*observatory.OutboundStatus{}
+		if o, err := c.observatory.GetObservation(context.Background()); err != nil {
+			return err
+		} else {
+			for _, x := range o.(*observatory.ObservationResult).GetStatus() {
+				resp[x.OutboundTag] = x
+			}
+		}
+		return resp
+	}))
+	return c, nil
+}
+
+func (p *MetricsHandler) Type() interface{} {
+	return (*MetricsHandler)(nil)
+}
+
+func (p *MetricsHandler) Start() error {
+	listener := &OutboundListener{
+		buffer: make(chan net.Conn, 4),
+		done:   done.New(),
+	}
+
+	go func() {
+		if err := http.Serve(listener, http.DefaultServeMux); err != nil {
+			newError("failed to start metrics server").Base(err).AtError().WriteToLog()
+		}
+	}()
+
+	if err := p.ohm.RemoveHandler(context.Background(), p.tag); err != nil {
+		newError("failed to remove existing handler").WriteToLog()
+	}
+
+	return p.ohm.AddHandler(context.Background(), &Outbound{
+		tag:      p.tag,
+		listener: listener,
+	})
+}
+
+func (p *MetricsHandler) Close() error {
+	return nil
+}
+
+func init() {
+	common.Must(common.RegisterConfig((*Config)(nil), func(ctx context.Context, cfg interface{}) (interface{}, error) {
+		return NewMetricsHandler(ctx, cfg.(*Config))
+	}))
+}

app/metrics/outbound.go

@@ -0,0 +1,109 @@
+package metrics
+
+import (
+	"context"
+	"sync"
+
+	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/common/net/cnc"
+	"github.com/xtls/xray-core/common/signal/done"
+	"github.com/xtls/xray-core/transport"
+)
+
+// OutboundListener is a net.Listener for listening metrics http connections.
+type OutboundListener struct {
+	buffer chan net.Conn
+	done   *done.Instance
+}
+
+func (l *OutboundListener) add(conn net.Conn) {
+	select {
+	case l.buffer <- conn:
+	case <-l.done.Wait():
+		conn.Close()
+	default:
+		conn.Close()
+	}
+}
+
+// Accept implements net.Listener.
+func (l *OutboundListener) Accept() (net.Conn, error) {
+	select {
+	case <-l.done.Wait():
+		return nil, newError("listen closed")
+	case c := <-l.buffer:
+		return c, nil
+	}
+}
+
+// Close implement net.Listener.
+func (l *OutboundListener) Close() error {
+	common.Must(l.done.Close())
+L:
+	for {
+		select {
+		case c := <-l.buffer:
+			c.Close()
+		default:
+			break L
+		}
+	}
+	return nil
+}
+
+// Addr implements net.Listener.
+func (l *OutboundListener) Addr() net.Addr {
+	return &net.TCPAddr{
+		IP:   net.IP{0, 0, 0, 0},
+		Port: 0,
+	}
+}
+
+// Outbound is an outbound.Handler that handles metrics http connections.
+type Outbound struct {
+	tag      string
+	listener *OutboundListener
+	access   sync.RWMutex
+	closed   bool
+}
+
+// Dispatch implements outbound.Handler.
+func (co *Outbound) Dispatch(ctx context.Context, link *transport.Link) {
+	co.access.RLock()
+
+	if co.closed {
+		common.Interrupt(link.Reader)
+		common.Interrupt(link.Writer)
+		co.access.RUnlock()
+		return
+	}
+
+	closeSignal := done.New()
+	c := cnc.NewConnection(cnc.ConnectionInputMulti(link.Writer), cnc.ConnectionOutputMulti(link.Reader), cnc.ConnectionOnClose(closeSignal))
+	co.listener.add(c)
+	co.access.RUnlock()
+	<-closeSignal.Wait()
+}
+
+// Tag implements outbound.Handler.
+func (co *Outbound) Tag() string {
+	return co.tag
+}
+
+// Start implements common.Runnable.
+func (co *Outbound) Start() error {
+	co.access.Lock()
+	co.closed = false
+	co.access.Unlock()
+	return nil
+}
+
+// Close implements common.Closable.
+func (co *Outbound) Close() error {
+	co.access.Lock()
+	defer co.access.Unlock()
+
+	co.closed = true
+	return co.listener.Close()
+}

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 v1.33.0
+// 	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,
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+	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

@@ -1,17 +1,13 @@
-//go:build !confonly
-// +build !confonly
-
 package command
 
 import (
 	"context"
 
-	"google.golang.org/grpc"
-
 	"github.com/xtls/xray-core/app/observatory"
 	"github.com/xtls/xray-core/common"
 	core "github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/extension"
+	"google.golang.org/grpc"
 )
 
 type service struct {

app/observatory/command/command.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/observatory/command/command.proto
 
 package command

app/observatory/command/command_grpc.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
-// - protoc-gen-go-grpc v1.2.0
-// - protoc             v3.18.0
+// - protoc-gen-go-grpc v1.3.0
+// - protoc             v4.23.1
 // source: app/observatory/command/command.proto
 
 package command
@@ -18,6 +18,10 @@ import (
 // Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
+const (
+	ObservatoryService_GetOutboundStatus_FullMethodName = "/xray.core.app.observatory.command.ObservatoryService/GetOutboundStatus"
+)
+
 // ObservatoryServiceClient is the client API for ObservatoryService service.
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
@@ -35,7 +39,7 @@ func NewObservatoryServiceClient(cc grpc.ClientConnInterface) ObservatoryService
 
 func (c *observatoryServiceClient) GetOutboundStatus(ctx context.Context, in *GetOutboundStatusRequest, opts ...grpc.CallOption) (*GetOutboundStatusResponse, error) {
 	out := new(GetOutboundStatusResponse)
-	err := c.cc.Invoke(ctx, "/xray.core.app.observatory.command.ObservatoryService/GetOutboundStatus", in, out, opts...)
+	err := c.cc.Invoke(ctx, ObservatoryService_GetOutboundStatus_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -80,7 +84,7 @@ func _ObservatoryService_GetOutboundStatus_Handler(srv interface{}, ctx context.
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/xray.core.app.observatory.command.ObservatoryService/GetOutboundStatus",
+		FullMethod: ObservatoryService_GetOutboundStatus_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(ObservatoryServiceServer).GetOutboundStatus(ctx, req.(*GetOutboundStatusRequest))

app/observatory/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/observatory/config.proto
 
 package observatory
@@ -67,36 +67,124 @@ 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
 	unknownFields protoimpl.UnknownFields
 
 	// @Document Whether this outbound is usable
-	//@Restriction ReadOnlyForUser
+	// @Restriction ReadOnlyForUser
 	Alive bool `protobuf:"varint,1,opt,name=alive,proto3" json:"alive,omitempty"`
 	// @Document The time for probe request to finish.
-	//@Type time.ms
-	//@Restriction ReadOnlyForUser
+	// @Type time.ms
+	// @Restriction ReadOnlyForUser
 	Delay int64 `protobuf:"varint,2,opt,name=delay,proto3" json:"delay,omitempty"`
 	// @Document The last error caused this outbound failed to relay probe request
-	//@Restriction NotMachineReadable
+	// @Restriction NotMachineReadable
 	LastErrorReason string `protobuf:"bytes,3,opt,name=last_error_reason,json=lastErrorReason,proto3" json:"last_error_reason,omitempty"`
 	// @Document The outbound tag for this Server
-	//@Type id.outboundTag
+	// @Type id.outboundTag
 	OutboundTag string `protobuf:"bytes,4,opt,name=outbound_tag,json=outboundTag,proto3" json:"outbound_tag,omitempty"`
 	// @Document The time this outbound is known to be alive
-	//@Type id.outboundTag
+	// @Type id.outboundTag
 	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
+	// @Type id.outboundTag
 	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 {
@@ -167,27 +255,34 @@ 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
 	unknownFields protoimpl.UnknownFields
 
 	// @Document Whether this outbound is usable
-	//@Restriction ReadOnlyForUser
+	// @Restriction ReadOnlyForUser
 	Alive bool `protobuf:"varint,1,opt,name=alive,proto3" json:"alive,omitempty"`
 	// @Document The time for probe request to finish.
-	//@Type time.ms
-	//@Restriction ReadOnlyForUser
+	// @Type time.ms
+	// @Restriction ReadOnlyForUser
 	Delay int64 `protobuf:"varint,2,opt,name=delay,proto3" json:"delay,omitempty"`
 	// @Document The error caused this outbound failed to relay probe request
-	//@Restriction NotMachineReadable
+	// @Restriction NotMachineReadable
 	LastErrorReason string `protobuf:"bytes,3,opt,name=last_error_reason,json=lastErrorReason,proto3" json:"last_error_reason,omitempty"`
 }
 
 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 {
@@ -243,14 +338,14 @@ type Intensity struct {
 	unknownFields protoimpl.UnknownFields
 
 	// @Document The time interval for a probe request in ms.
-	//@Type time.ms
+	// @Type time.ms
 	ProbeInterval uint32 `protobuf:"varint,1,opt,name=probe_interval,json=probeInterval,proto3" json:"probe_interval,omitempty"`
 }
 
 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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+	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
+	(*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/observatory/observer.go

@@ -9,8 +9,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/golang/protobuf/proto"
-
 	"github.com/xtls/xray-core/common"
 	v2net "github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/session"
@@ -20,6 +18,7 @@ import (
 	"github.com/xtls/xray-core/features/extension"
 	"github.com/xtls/xray-core/features/outbound"
 	"github.com/xtls/xray-core/transport/internet/tagged"
+	"google.golang.org/protobuf/proto"
 )
 
 type Observer struct {

app/policy/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/policy/config.proto
 
 package policy

app/proxyman/command/command.go

@@ -3,13 +3,12 @@ package command
 import (
 	"context"
 
-	grpc "google.golang.org/grpc"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/inbound"
 	"github.com/xtls/xray-core/features/outbound"
 	"github.com/xtls/xray-core/proxy"
+	grpc "google.golang.org/grpc"
 )
 
 // InboundOperation is the interface for operations that applies to inbound handlers.

app/proxyman/command/command.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/proxyman/command/command.proto
 
 package command

app/proxyman/command/command_grpc.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
-// - protoc-gen-go-grpc v1.2.0
-// - protoc             v3.18.0
+// - protoc-gen-go-grpc v1.3.0
+// - protoc             v4.23.1
 // source: app/proxyman/command/command.proto
 
 package command
@@ -18,6 +18,15 @@ import (
 // Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
+const (
+	HandlerService_AddInbound_FullMethodName     = "/xray.app.proxyman.command.HandlerService/AddInbound"
+	HandlerService_RemoveInbound_FullMethodName  = "/xray.app.proxyman.command.HandlerService/RemoveInbound"
+	HandlerService_AlterInbound_FullMethodName   = "/xray.app.proxyman.command.HandlerService/AlterInbound"
+	HandlerService_AddOutbound_FullMethodName    = "/xray.app.proxyman.command.HandlerService/AddOutbound"
+	HandlerService_RemoveOutbound_FullMethodName = "/xray.app.proxyman.command.HandlerService/RemoveOutbound"
+	HandlerService_AlterOutbound_FullMethodName  = "/xray.app.proxyman.command.HandlerService/AlterOutbound"
+)
+
 // HandlerServiceClient is the client API for HandlerService service.
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
@@ -40,7 +49,7 @@ func NewHandlerServiceClient(cc grpc.ClientConnInterface) HandlerServiceClient {
 
 func (c *handlerServiceClient) AddInbound(ctx context.Context, in *AddInboundRequest, opts ...grpc.CallOption) (*AddInboundResponse, error) {
 	out := new(AddInboundResponse)
-	err := c.cc.Invoke(ctx, "/xray.app.proxyman.command.HandlerService/AddInbound", in, out, opts...)
+	err := c.cc.Invoke(ctx, HandlerService_AddInbound_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -49,7 +58,7 @@ func (c *handlerServiceClient) AddInbound(ctx context.Context, in *AddInboundReq
 
 func (c *handlerServiceClient) RemoveInbound(ctx context.Context, in *RemoveInboundRequest, opts ...grpc.CallOption) (*RemoveInboundResponse, error) {
 	out := new(RemoveInboundResponse)
-	err := c.cc.Invoke(ctx, "/xray.app.proxyman.command.HandlerService/RemoveInbound", in, out, opts...)
+	err := c.cc.Invoke(ctx, HandlerService_RemoveInbound_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -58,7 +67,7 @@ func (c *handlerServiceClient) RemoveInbound(ctx context.Context, in *RemoveInbo
 
 func (c *handlerServiceClient) AlterInbound(ctx context.Context, in *AlterInboundRequest, opts ...grpc.CallOption) (*AlterInboundResponse, error) {
 	out := new(AlterInboundResponse)
-	err := c.cc.Invoke(ctx, "/xray.app.proxyman.command.HandlerService/AlterInbound", in, out, opts...)
+	err := c.cc.Invoke(ctx, HandlerService_AlterInbound_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -67,7 +76,7 @@ func (c *handlerServiceClient) AlterInbound(ctx context.Context, in *AlterInboun
 
 func (c *handlerServiceClient) AddOutbound(ctx context.Context, in *AddOutboundRequest, opts ...grpc.CallOption) (*AddOutboundResponse, error) {
 	out := new(AddOutboundResponse)
-	err := c.cc.Invoke(ctx, "/xray.app.proxyman.command.HandlerService/AddOutbound", in, out, opts...)
+	err := c.cc.Invoke(ctx, HandlerService_AddOutbound_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -76,7 +85,7 @@ func (c *handlerServiceClient) AddOutbound(ctx context.Context, in *AddOutboundR
 
 func (c *handlerServiceClient) RemoveOutbound(ctx context.Context, in *RemoveOutboundRequest, opts ...grpc.CallOption) (*RemoveOutboundResponse, error) {
 	out := new(RemoveOutboundResponse)
-	err := c.cc.Invoke(ctx, "/xray.app.proxyman.command.HandlerService/RemoveOutbound", in, out, opts...)
+	err := c.cc.Invoke(ctx, HandlerService_RemoveOutbound_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -85,7 +94,7 @@ func (c *handlerServiceClient) RemoveOutbound(ctx context.Context, in *RemoveOut
 
 func (c *handlerServiceClient) AlterOutbound(ctx context.Context, in *AlterOutboundRequest, opts ...grpc.CallOption) (*AlterOutboundResponse, error) {
 	out := new(AlterOutboundResponse)
-	err := c.cc.Invoke(ctx, "/xray.app.proxyman.command.HandlerService/AlterOutbound", in, out, opts...)
+	err := c.cc.Invoke(ctx, HandlerService_AlterOutbound_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -150,7 +159,7 @@ func _HandlerService_AddInbound_Handler(srv interface{}, ctx context.Context, de
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/xray.app.proxyman.command.HandlerService/AddInbound",
+		FullMethod: HandlerService_AddInbound_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(HandlerServiceServer).AddInbound(ctx, req.(*AddInboundRequest))
@@ -168,7 +177,7 @@ func _HandlerService_RemoveInbound_Handler(srv interface{}, ctx context.Context,
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/xray.app.proxyman.command.HandlerService/RemoveInbound",
+		FullMethod: HandlerService_RemoveInbound_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(HandlerServiceServer).RemoveInbound(ctx, req.(*RemoveInboundRequest))
@@ -186,7 +195,7 @@ func _HandlerService_AlterInbound_Handler(srv interface{}, ctx context.Context,
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/xray.app.proxyman.command.HandlerService/AlterInbound",
+		FullMethod: HandlerService_AlterInbound_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(HandlerServiceServer).AlterInbound(ctx, req.(*AlterInboundRequest))
@@ -204,7 +213,7 @@ func _HandlerService_AddOutbound_Handler(srv interface{}, ctx context.Context, d
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/xray.app.proxyman.command.HandlerService/AddOutbound",
+		FullMethod: HandlerService_AddOutbound_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(HandlerServiceServer).AddOutbound(ctx, req.(*AddOutboundRequest))
@@ -222,7 +231,7 @@ func _HandlerService_RemoveOutbound_Handler(srv interface{}, ctx context.Context
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/xray.app.proxyman.command.HandlerService/RemoveOutbound",
+		FullMethod: HandlerService_RemoveOutbound_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(HandlerServiceServer).RemoveOutbound(ctx, req.(*RemoveOutboundRequest))
@@ -240,7 +249,7 @@ func _HandlerService_AlterOutbound_Handler(srv interface{}, ctx context.Context,
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/xray.app.proxyman.command.HandlerService/AlterOutbound",
+		FullMethod: HandlerService_AlterOutbound_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(HandlerServiceServer).AlterOutbound(ctx, req.(*AlterOutboundRequest))

app/proxyman/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/proxyman/config.proto
 
 package proxyman
@@ -326,7 +326,7 @@ type ReceiverConfig struct {
 	// Override domains for the given protocol.
 	// Deprecated. Use sniffing_settings.
 	//
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in app/proxyman/config.proto.
 	DomainOverride   []KnownProtocols `protobuf:"varint,7,rep,packed,name=domain_override,json=domainOverride,proto3,enum=xray.app.proxyman.KnownProtocols" json:"domain_override,omitempty"`
 	SniffingSettings *SniffingConfig  `protobuf:"bytes,8,opt,name=sniffing_settings,json=sniffingSettings,proto3" json:"sniffing_settings,omitempty"`
 }
@@ -398,7 +398,7 @@ func (x *ReceiverConfig) GetReceiveOriginalDestination() bool {
 	return false
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in app/proxyman/config.proto.
 func (x *ReceiverConfig) GetDomainOverride() []KnownProtocols {
 	if x != nil {
 		return x.DomainOverride
@@ -524,6 +524,7 @@ type SenderConfig struct {
 	StreamSettings    *internet.StreamConfig `protobuf:"bytes,2,opt,name=stream_settings,json=streamSettings,proto3" json:"stream_settings,omitempty"`
 	ProxySettings     *internet.ProxyConfig  `protobuf:"bytes,3,opt,name=proxy_settings,json=proxySettings,proto3" json:"proxy_settings,omitempty"`
 	MultiplexSettings *MultiplexingConfig    `protobuf:"bytes,4,opt,name=multiplex_settings,json=multiplexSettings,proto3" json:"multiplex_settings,omitempty"`
+	ViaCidr           string                 `protobuf:"bytes,5,opt,name=via_cidr,json=viaCidr,proto3" json:"via_cidr,omitempty"`
 }
 
 func (x *SenderConfig) Reset() {
@@ -586,6 +587,13 @@ func (x *SenderConfig) GetMultiplexSettings() *MultiplexingConfig {
 	return nil
 }
 
+func (x *SenderConfig) GetViaCidr() string {
+	if x != nil {
+		return x.ViaCidr
+	}
+	return ""
+}
+
 type MultiplexingConfig struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -594,7 +602,11 @@ type MultiplexingConfig struct {
 	// Whether or not Mux is enabled.
 	Enabled bool `protobuf:"varint,1,opt,name=enabled,proto3" json:"enabled,omitempty"`
 	// Max number of concurrent connections that one Mux connection can handle.
-	Concurrency uint32 `protobuf:"varint,2,opt,name=concurrency,proto3" json:"concurrency,omitempty"`
+	Concurrency int32 `protobuf:"varint,2,opt,name=concurrency,proto3" json:"concurrency,omitempty"`
+	// Transport XUDP in another Mux.
+	XudpConcurrency int32 `protobuf:"varint,3,opt,name=xudpConcurrency,proto3" json:"xudpConcurrency,omitempty"`
+	// "reject" (default), "allow" or "skip".
+	XudpProxyUDP443 string `protobuf:"bytes,4,opt,name=xudpProxyUDP443,proto3" json:"xudpProxyUDP443,omitempty"`
 }
 
 func (x *MultiplexingConfig) Reset() {
@@ -636,13 +648,27 @@ func (x *MultiplexingConfig) GetEnabled() bool {
 	return false
 }
 
-func (x *MultiplexingConfig) GetConcurrency() uint32 {
+func (x *MultiplexingConfig) GetConcurrency() int32 {
 	if x != nil {
 		return x.Concurrency
 	}
 	return 0
 }
 
+func (x *MultiplexingConfig) GetXudpConcurrency() int32 {
+	if x != nil {
+		return x.XudpConcurrency
+	}
+	return 0
+}
+
+func (x *MultiplexingConfig) GetXudpProxyUDP443() string {
+	if x != nil {
+		return x.XudpProxyUDP443
+	}
+	return ""
+}
+
 type AllocationStrategy_AllocationStrategyConcurrency struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -837,7 +863,7 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
 	0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x73, 0x65, 0x72, 0x69, 0x61, 0x6c, 0x2e, 0x54, 0x79, 0x70, 0x65,
 	0x64, 0x4d, 0x65, 0x73, 0x73, 0x61, 0x67, 0x65, 0x52, 0x0d, 0x70, 0x72, 0x6f, 0x78, 0x79, 0x53,
 	0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x22, 0x10, 0x0a, 0x0e, 0x4f, 0x75, 0x74, 0x62, 0x6f,
-	0x75, 0x6e, 0x64, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x22, 0xb0, 0x02, 0x0a, 0x0c, 0x53, 0x65,
+	0x75, 0x6e, 0x64, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x22, 0xcb, 0x02, 0x0a, 0x0c, 0x53, 0x65,
 	0x6e, 0x64, 0x65, 0x72, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x2d, 0x0a, 0x03, 0x76, 0x69,
 	0x61, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0b, 0x32, 0x1b, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x63,
 	0x6f, 0x6d, 0x6d, 0x6f, 0x6e, 0x2e, 0x6e, 0x65, 0x74, 0x2e, 0x49, 0x50, 0x4f, 0x72, 0x44, 0x6f,
@@ -856,12 +882,19 @@ var file_app_proxyman_config_proto_rawDesc = []byte{
 	0x28, 0x0b, 0x32, 0x25, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x70, 0x72,
 	0x6f, 0x78, 0x79, 0x6d, 0x61, 0x6e, 0x2e, 0x4d, 0x75, 0x6c, 0x74, 0x69, 0x70, 0x6c, 0x65, 0x78,
 	0x69, 0x6e, 0x67, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x52, 0x11, 0x6d, 0x75, 0x6c, 0x74, 0x69,
-	0x70, 0x6c, 0x65, 0x78, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x22, 0x50, 0x0a, 0x12,
-	0x4d, 0x75, 0x6c, 0x74, 0x69, 0x70, 0x6c, 0x65, 0x78, 0x69, 0x6e, 0x67, 0x43, 0x6f, 0x6e, 0x66,
-	0x69, 0x67, 0x12, 0x18, 0x0a, 0x07, 0x65, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64, 0x18, 0x01, 0x20,
-	0x01, 0x28, 0x08, 0x52, 0x07, 0x65, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64, 0x12, 0x20, 0x0a, 0x0b,
-	0x63, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x63, 0x79, 0x18, 0x02, 0x20, 0x01, 0x28,
-	0x0d, 0x52, 0x0b, 0x63, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x63, 0x79, 0x2a, 0x23,
+	0x70, 0x6c, 0x65, 0x78, 0x53, 0x65, 0x74, 0x74, 0x69, 0x6e, 0x67, 0x73, 0x12, 0x19, 0x0a, 0x08,
+	0x76, 0x69, 0x61, 0x5f, 0x63, 0x69, 0x64, 0x72, 0x18, 0x05, 0x20, 0x01, 0x28, 0x09, 0x52, 0x07,
+	0x76, 0x69, 0x61, 0x43, 0x69, 0x64, 0x72, 0x22, 0xa4, 0x01, 0x0a, 0x12, 0x4d, 0x75, 0x6c, 0x74,
+	0x69, 0x70, 0x6c, 0x65, 0x78, 0x69, 0x6e, 0x67, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x18,
+	0x0a, 0x07, 0x65, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64, 0x18, 0x01, 0x20, 0x01, 0x28, 0x08, 0x52,
+	0x07, 0x65, 0x6e, 0x61, 0x62, 0x6c, 0x65, 0x64, 0x12, 0x20, 0x0a, 0x0b, 0x63, 0x6f, 0x6e, 0x63,
+	0x75, 0x72, 0x72, 0x65, 0x6e, 0x63, 0x79, 0x18, 0x02, 0x20, 0x01, 0x28, 0x05, 0x52, 0x0b, 0x63,
+	0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x63, 0x79, 0x12, 0x28, 0x0a, 0x0f, 0x78, 0x75,
+	0x64, 0x70, 0x43, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72, 0x65, 0x6e, 0x63, 0x79, 0x18, 0x03, 0x20,
+	0x01, 0x28, 0x05, 0x52, 0x0f, 0x78, 0x75, 0x64, 0x70, 0x43, 0x6f, 0x6e, 0x63, 0x75, 0x72, 0x72,
+	0x65, 0x6e, 0x63, 0x79, 0x12, 0x28, 0x0a, 0x0f, 0x78, 0x75, 0x64, 0x70, 0x50, 0x72, 0x6f, 0x78,
+	0x79, 0x55, 0x44, 0x50, 0x34, 0x34, 0x33, 0x18, 0x04, 0x20, 0x01, 0x28, 0x09, 0x52, 0x0f, 0x78,
+	0x75, 0x64, 0x70, 0x50, 0x72, 0x6f, 0x78, 0x79, 0x55, 0x44, 0x50, 0x34, 0x34, 0x33, 0x2a, 0x23,
 	0x0a, 0x0e, 0x4b, 0x6e, 0x6f, 0x77, 0x6e, 0x50, 0x72, 0x6f, 0x74, 0x6f, 0x63, 0x6f, 0x6c, 0x73,
 	0x12, 0x08, 0x0a, 0x04, 0x48, 0x54, 0x54, 0x50, 0x10, 0x00, 0x12, 0x07, 0x0a, 0x03, 0x54, 0x4c,
 	0x53, 0x10, 0x01, 0x42, 0x55, 0x0a, 0x15, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e,

app/proxyman/config.proto

@@ -91,11 +91,16 @@ message SenderConfig {
   xray.transport.internet.StreamConfig stream_settings = 2;
   xray.transport.internet.ProxyConfig proxy_settings = 3;
   MultiplexingConfig multiplex_settings = 4;
+  string via_cidr = 5;
 }
 
 message MultiplexingConfig {
   // Whether or not Mux is enabled.
   bool enabled = 1;
   // Max number of concurrent connections that one Mux connection can handle.
-  uint32 concurrency = 2;
+  int32 concurrency = 2;
+  // Transport XUDP in another Mux.
+  int32 xudpConcurrency = 3;
+  // "reject" (default), "allow" or "skip".
+  string xudpProxyUDP443 = 4;
 }

app/proxyman/inbound/always.go

@@ -144,7 +144,6 @@ func NewAlwaysOnInboundHandler(ctx context.Context, tag string, receiverConfig *
 				}
 			}
 		}
-
 	}
 
 	return h, nil

app/proxyman/inbound/dynamic.go

@@ -87,7 +87,6 @@ func (h *DynamicInboundHandler) allocatePort() net.Port {
 			return port
 		}
 	}
-
 }
 
 func (h *DynamicInboundHandler) closeWorkers(workers []worker) {

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{
@@ -108,9 +108,7 @@ func (w *tcpWorker) callback(conn stat.Connection) {
 		newError("connection ends").Base(err).WriteToLog(session.ExportIDToError(ctx))
 	}
 	cancel()
-	if err := conn.Close(); err != nil {
-		newError("failed to close connection").Base(err).WriteToLog(session.ExportIDToError(ctx))
-	}
+	conn.Close()
 }
 
 func (w *tcpWorker) Proxy() proxy.Inbound {
@@ -364,7 +362,7 @@ func (w *udpWorker) clean() error {
 	}
 
 	for addr, conn := range w.activeConn {
-		if nowSec-atomic.LoadInt64(&conn.lastActivityTime) > 5*60 { // TODO Timeout too small
+		if nowSec-atomic.LoadInt64(&conn.lastActivityTime) > 2*60 {
 			if !conn.inactive {
 				conn.setInactive()
 				delete(w.activeConn, addr)

app/proxyman/outbound/handler.go

@@ -2,9 +2,15 @@ package outbound
 
 import (
 	"context"
+	"errors"
+	"io"
+	"math/rand"
+	gonet "net"
+	"os"
 
 	"github.com/xtls/xray-core/app/proxyman"
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/mux"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/net/cnc"
@@ -54,6 +60,8 @@ type Handler struct {
 	proxy           proxy.Outbound
 	outboundManager outbound.Manager
 	mux             *mux.ClientManager
+	xudp            *mux.ClientManager
+	udp443          string
 	uplinkCounter   stats.Counter
 	downlinkCounter stats.Counter
 }
@@ -103,24 +111,52 @@ func NewHandler(ctx context.Context, config *core.OutboundHandlerConfig) (outbou
 	}
 
 	if h.senderSettings != nil && h.senderSettings.MultiplexSettings != nil {
-		config := h.senderSettings.MultiplexSettings
-		if config.Concurrency < 1 || config.Concurrency > 1024 {
-			return nil, newError("invalid mux concurrency: ", config.Concurrency).AtWarning()
+		if config := h.senderSettings.MultiplexSettings; config.Enabled {
+			if config.Concurrency < 0 {
+				h.mux = &mux.ClientManager{Enabled: false}
 			}
+			if config.Concurrency == 0 {
+				config.Concurrency = 8 // same as before
+			}
+			if config.Concurrency > 0 {
 				h.mux = &mux.ClientManager{
-			Enabled: h.senderSettings.MultiplexSettings.Enabled,
+					Enabled: true,
 					Picker: &mux.IncrementalWorkerPicker{
 						Factory: &mux.DialingWorkerFactory{
 							Proxy:  proxyHandler,
 							Dialer: h,
 							Strategy: mux.ClientStrategy{
-						MaxConcurrency: config.Concurrency,
+								MaxConcurrency: uint32(config.Concurrency),
 								MaxConnection:  128,
 							},
 						},
 					},
 				}
 			}
+			if config.XudpConcurrency < 0 {
+				h.xudp = &mux.ClientManager{Enabled: false}
+			}
+			if config.XudpConcurrency == 0 {
+				h.xudp = nil // same as before
+			}
+			if config.XudpConcurrency > 0 {
+				h.xudp = &mux.ClientManager{
+					Enabled: true,
+					Picker: &mux.IncrementalWorkerPicker{
+						Factory: &mux.DialingWorkerFactory{
+							Proxy:  proxyHandler,
+							Dialer: h,
+							Strategy: mux.ClientStrategy{
+								MaxConcurrency: uint32(config.XudpConcurrency),
+								MaxConnection:  128,
+							},
+						},
+					},
+				}
+			}
+			h.udp443 = config.XudpProxyUDP443
+		}
+	}
 
 	h.proxy = proxyHandler
 	return h, nil
@@ -133,25 +169,58 @@ func (h *Handler) Tag() string {
 
 // Dispatch implements proxy.Outbound.Dispatch.
 func (h *Handler) Dispatch(ctx context.Context, link *transport.Link) {
-	if h.mux != nil && (h.mux.Enabled || session.MuxPreferedFromContext(ctx)) {
-		if err := h.mux.Dispatch(ctx, link); err != nil {
+	outbound := session.OutboundFromContext(ctx)
+	if outbound.Target.Network == net.Network_UDP && outbound.OriginalTarget.Address != nil && outbound.OriginalTarget.Address != outbound.Target.Address {
+		link.Reader = &buf.EndpointOverrideReader{Reader: link.Reader, Dest: outbound.Target.Address, OriginalDest: outbound.OriginalTarget.Address}
+		link.Writer = &buf.EndpointOverrideWriter{Writer: link.Writer, Dest: outbound.Target.Address, OriginalDest: outbound.OriginalTarget.Address}
+	}
+	if h.mux != nil {
+		test := func(err error) {
+			if err != nil {
 				err := newError("failed to process mux outbound traffic").Base(err)
 				session.SubmitOutboundErrorToOriginator(ctx, err)
 				err.WriteToLog(session.ExportIDToError(ctx))
 				common.Interrupt(link.Writer)
 			}
-	} else {
-		if err := h.proxy.Process(ctx, link, h); err != nil {
+		}
+		if outbound.Target.Network == net.Network_UDP && outbound.Target.Port == 443 {
+			switch h.udp443 {
+			case "reject":
+				test(newError("XUDP rejected UDP/443 traffic").AtInfo())
+				return
+			case "skip":
+				goto out
+			}
+		}
+		if h.xudp != nil && outbound.Target.Network == net.Network_UDP {
+			if !h.xudp.Enabled {
+				goto out
+			}
+			test(h.xudp.Dispatch(ctx, link))
+			return
+		}
+		if h.mux.Enabled {
+			test(h.mux.Dispatch(ctx, link))
+			return
+		}
+	}
+out:
+	err := h.proxy.Process(ctx, link, h)
+	if err != nil {
+		if errors.Is(err, io.EOF) || errors.Is(err, io.ErrClosedPipe) || errors.Is(err, context.Canceled) {
+			err = nil
+		}
+	}
+	if err != nil {
 		// Ensure outbound ray is properly closed.
 		err := newError("failed to process outbound traffic").Base(err)
 		session.SubmitOutboundErrorToOriginator(ctx, err)
 		err.WriteToLog(session.ExportIDToError(ctx))
 		common.Interrupt(link.Writer)
 	} else {
-			common.Must(common.Close(link.Writer))
+		common.Close(link.Writer)
 	}
 	common.Interrupt(link.Reader)
-	}
 }
 
 // Address implements internet.Dialer.
@@ -162,6 +231,10 @@ 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 {
@@ -198,12 +271,25 @@ func (h *Handler) Dial(ctx context.Context, dest net.Destination) (stat.Connecti
 				outbound = new(session.Outbound)
 				ctx = session.ContextWithOutbound(ctx, outbound)
 			}
+			if h.senderSettings.ViaCidr == "" {
 				outbound.Gateway = h.senderSettings.Via.AsAddress()
+			} else { //Get a random address.
+				outbound.Gateway = ParseRandomIPv6(h.senderSettings.Via.AsAddress(), h.senderSettings.ViaCidr)
+			}
 		}
 	}
 
+	if conn, err := h.getUoTConnection(ctx, dest); err != os.ErrInvalid {
+		return conn, err
+	}
+
 	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 {
@@ -232,3 +318,17 @@ func (h *Handler) Close() error {
 	common.Close(h.mux)
 	return nil
 }
+
+// Return random IPv6 in a CIDR block
+func ParseRandomIPv6(address net.Address, prefix string) net.Address {
+	addr := address.IP().String()
+	_, network, _ := gonet.ParseCIDR(addr + "/" + prefix)
+
+	ipv6 := network.IP.To16()
+	prefixLen, _ := network.Mask.Size()
+	for i := prefixLen / 8; i < 16; i++ {
+		ipv6[i] = byte(rand.Intn(256))
+	}
+
+	return net.ParseAddress(gonet.IP(ipv6).String())
+}

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/proxyman/outbound/uot.go

@@ -0,0 +1,34 @@
+package outbound
+
+import (
+	"context"
+	"os"
+
+	"github.com/sagernet/sing/common/uot"
+	"github.com/xtls/xray-core/common/net"
+	"github.com/xtls/xray-core/transport/internet"
+	"github.com/xtls/xray-core/transport/internet/stat"
+)
+
+func (h *Handler) getUoTConnection(ctx context.Context, dest net.Destination) (stat.Connection, error) {
+	if dest.Address == nil {
+		return nil, newError("nil destination address")
+	}
+	if !dest.Address.Family().IsDomain() {
+		return nil, os.ErrInvalid
+	}
+	var uotVersion int
+	if dest.Address.Domain() == uot.MagicAddress {
+		uotVersion = uot.Version
+	} else if dest.Address.Domain() == uot.LegacyMagicAddress {
+		uotVersion = uot.LegacyVersion
+	} else {
+		return nil, os.ErrInvalid
+	}
+	packetConn, err := internet.ListenSystemPacket(ctx, &net.UDPAddr{IP: net.AnyIP.IP(), Port: 0}, h.streamSettings.SocketSettings)
+	if err != nil {
+		return nil, newError("unable to listen socket").Base(err)
+	}
+	conn := uot.NewServerConn(packetConn, uotVersion)
+	return h.getStatCouterConnection(conn), nil
+}

app/reverse/bridge.go

@@ -4,8 +4,6 @@ import (
 	"context"
 	"time"
 
-	"github.com/golang/protobuf/proto"
-
 	"github.com/xtls/xray-core/common/mux"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/session"
@@ -13,6 +11,7 @@ import (
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/transport"
 	"github.com/xtls/xray-core/transport/pipe"
+	"google.golang.org/protobuf/proto"
 )
 
 // Bridge is a component in reverse proxy, that relays connections from Portal to local address.

app/reverse/config.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/reverse/config.proto
 
 package reverse

app/reverse/portal.go

@@ -5,8 +5,6 @@ import (
 	"sync"
 	"time"
 
-	"github.com/golang/protobuf/proto"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/buf"
 	"github.com/xtls/xray-core/common/mux"
@@ -16,6 +14,7 @@ import (
 	"github.com/xtls/xray-core/features/outbound"
 	"github.com/xtls/xray-core/transport"
 	"github.com/xtls/xray-core/transport/pipe"
+	"google.golang.org/protobuf/proto"
 )
 
 type Portal struct {

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"
 )
@@ -12,40 +12,108 @@ 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
+	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
 		}
-	tags := hs.Select(b.selectors)
-	if len(tags) == 0 {
-		return "", newError("no available outbounds selected")
+		return "", err
+	}
+	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
 }
+
 func (b *Balancer) InjectContext(ctx context.Context) {
 	if contextReceiver, ok := b.strategy.(extension.ContextReceiver); ok {
 		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

@@ -6,12 +6,11 @@ import (
 	"context"
 	"time"
 
-	"google.golang.org/grpc"
-
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/routing"
 	"github.com/xtls/xray-core/features/stats"
+	"google.golang.org/grpc"
 )
 
 // routingServer is an implementation of RoutingService.
@@ -20,6 +19,55 @@ 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")
+}
+
+func (s *routingServer) AddRule(ctx context.Context, request *AddRuleRequest) (*AddRuleResponse, error) {
+	if bo, ok := s.router.(routing.Router); ok {
+		return &AddRuleResponse{}, bo.AddRule(request.Config, request.ShouldAppend)
+	}
+	return nil, newError("unsupported router implementation")
+
+}
+func (s *routingServer) RemoveRule(ctx context.Context, request *RemoveRuleRequest) (*RemoveRuleResponse, error) {
+	if bo, ok := s.router.(routing.Router); ok {
+		return &RemoveRuleResponse{}, bo.RemoveRule(request.RuleTag)
+	}
+	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.proto

@@ -7,6 +7,7 @@ option java_package = "com.xray.app.router.command";
 option java_multiple_files = true;
 
 import "common/net/network.proto";
+import "common/serial/typed_message.proto";
 
 // RoutingContext is the context with information relative to routing process.
 // It conforms to the structure of xray.features.routing.Context and
@@ -60,10 +61,56 @@ 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 {}
+
+message AddRuleRequest {
+  xray.common.serial.TypedMessage config = 1;
+  bool shouldAppend = 2;
+}
+message AddRuleResponse {}
+
+message RemoveRuleRequest {
+  string ruleTag = 1;
+}
+
+message RemoveRuleResponse {}
+
 service RoutingService {
   rpc SubscribeRoutingStats(SubscribeRoutingStatsRequest)
       returns (stream RoutingContext) {}
   rpc TestRoute(TestRouteRequest) returns (RoutingContext) {}
+
+  rpc GetBalancerInfo(GetBalancerInfoRequest) returns (GetBalancerInfoResponse){}
+  rpc OverrideBalancerTarget(OverrideBalancerTargetRequest) returns (OverrideBalancerTargetResponse) {}
+  
+  rpc AddRule(AddRuleRequest) returns (AddRuleResponse) {}
+  rpc RemoveRule(RemoveRuleRequest) returns (RemoveRuleResponse) {}
 }
 
 message Config {}

app/router/command/command_grpc.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
-// - protoc-gen-go-grpc v1.2.0
-// - protoc             v3.18.0
+// - protoc-gen-go-grpc v1.3.0
+// - protoc             v4.23.1
 // source: app/router/command/command.proto
 
 package command
@@ -18,12 +18,25 @@ import (
 // Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
+const (
+	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"
+	RoutingService_AddRule_FullMethodName                = "/xray.app.router.command.RoutingService/AddRule"
+	RoutingService_RemoveRule_FullMethodName             = "/xray.app.router.command.RoutingService/RemoveRule"
+)
+
 // RoutingServiceClient is the client API for RoutingService service.
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
 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)
+	AddRule(ctx context.Context, in *AddRuleRequest, opts ...grpc.CallOption) (*AddRuleResponse, error)
+	RemoveRule(ctx context.Context, in *RemoveRuleRequest, opts ...grpc.CallOption) (*RemoveRuleResponse, error)
 }
 
 type routingServiceClient struct {
@@ -35,7 +48,7 @@ func NewRoutingServiceClient(cc grpc.ClientConnInterface) RoutingServiceClient {
 }
 
 func (c *routingServiceClient) SubscribeRoutingStats(ctx context.Context, in *SubscribeRoutingStatsRequest, opts ...grpc.CallOption) (RoutingService_SubscribeRoutingStatsClient, error) {
-	stream, err := c.cc.NewStream(ctx, &RoutingService_ServiceDesc.Streams[0], "/xray.app.router.command.RoutingService/SubscribeRoutingStats", opts...)
+	stream, err := c.cc.NewStream(ctx, &RoutingService_ServiceDesc.Streams[0], RoutingService_SubscribeRoutingStats_FullMethodName, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -68,7 +81,43 @@ func (x *routingServiceSubscribeRoutingStatsClient) Recv() (*RoutingContext, err
 
 func (c *routingServiceClient) TestRoute(ctx context.Context, in *TestRouteRequest, opts ...grpc.CallOption) (*RoutingContext, error) {
 	out := new(RoutingContext)
-	err := c.cc.Invoke(ctx, "/xray.app.router.command.RoutingService/TestRoute", in, out, opts...)
+	err := c.cc.Invoke(ctx, RoutingService_TestRoute_FullMethodName, in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	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
+}
+
+func (c *routingServiceClient) AddRule(ctx context.Context, in *AddRuleRequest, opts ...grpc.CallOption) (*AddRuleResponse, error) {
+	out := new(AddRuleResponse)
+	err := c.cc.Invoke(ctx, RoutingService_AddRule_FullMethodName, in, out, opts...)
+	if err != nil {
+		return nil, err
+	}
+	return out, nil
+}
+
+func (c *routingServiceClient) RemoveRule(ctx context.Context, in *RemoveRuleRequest, opts ...grpc.CallOption) (*RemoveRuleResponse, error) {
+	out := new(RemoveRuleResponse)
+	err := c.cc.Invoke(ctx, RoutingService_RemoveRule_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -81,6 +130,10 @@ func (c *routingServiceClient) TestRoute(ctx context.Context, in *TestRouteReque
 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)
+	AddRule(context.Context, *AddRuleRequest) (*AddRuleResponse, error)
+	RemoveRule(context.Context, *RemoveRuleRequest) (*RemoveRuleResponse, error)
 	mustEmbedUnimplementedRoutingServiceServer()
 }
 
@@ -94,6 +147,18 @@ 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) AddRule(context.Context, *AddRuleRequest) (*AddRuleResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method AddRule not implemented")
+}
+func (UnimplementedRoutingServiceServer) RemoveRule(context.Context, *RemoveRuleRequest) (*RemoveRuleResponse, error) {
+	return nil, status.Errorf(codes.Unimplemented, "method RemoveRule not implemented")
+}
 func (UnimplementedRoutingServiceServer) mustEmbedUnimplementedRoutingServiceServer() {}
 
 // UnsafeRoutingServiceServer may be embedded to opt out of forward compatibility for this service.
@@ -138,7 +203,7 @@ func _RoutingService_TestRoute_Handler(srv interface{}, ctx context.Context, dec
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/xray.app.router.command.RoutingService/TestRoute",
+		FullMethod: RoutingService_TestRoute_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(RoutingServiceServer).TestRoute(ctx, req.(*TestRouteRequest))
@@ -146,6 +211,78 @@ 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)
+}
+
+func _RoutingService_AddRule_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(AddRuleRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RoutingServiceServer).AddRule(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: RoutingService_AddRule_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RoutingServiceServer).AddRule(ctx, req.(*AddRuleRequest))
+	}
+	return interceptor(ctx, in, info, handler)
+}
+
+func _RoutingService_RemoveRule_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
+	in := new(RemoveRuleRequest)
+	if err := dec(in); err != nil {
+		return nil, err
+	}
+	if interceptor == nil {
+		return srv.(RoutingServiceServer).RemoveRule(ctx, in)
+	}
+	info := &grpc.UnaryServerInfo{
+		Server:     srv,
+		FullMethod: RoutingService_RemoveRule_FullMethodName,
+	}
+	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
+		return srv.(RoutingServiceServer).RemoveRule(ctx, req.(*RemoveRuleRequest))
+	}
+	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)
@@ -157,6 +294,22 @@ var RoutingService_ServiceDesc = grpc.ServiceDesc{
 			MethodName: "TestRoute",
 			Handler:    _RoutingService_TestRoute_Handler,
 		},
+		{
+			MethodName: "GetBalancerInfo",
+			Handler:    _RoutingService_GetBalancerInfo_Handler,
+		},
+		{
+			MethodName: "OverrideBalancerTarget",
+			Handler:    _RoutingService_OverrideBalancerTarget_Handler,
+		},
+		{
+			MethodName: "AddRule",
+			Handler:    _RoutingService_AddRule_Handler,
+		},
+		{
+			MethodName: "RemoveRule",
+			Handler:    _RoutingService_RemoveRule_Handler,
+		},
 	},
 	Streams: []grpc.StreamDesc{
 		{

app/router/command/command_test.go

@@ -8,9 +8,6 @@ import (
 	"github.com/golang/mock/gomock"
 	"github.com/google/go-cmp/cmp"
 	"github.com/google/go-cmp/cmp/cmpopts"
-	"google.golang.org/grpc"
-	"google.golang.org/grpc/test/bufconn"
-
 	"github.com/xtls/xray-core/app/router"
 	. "github.com/xtls/xray-core/app/router/command"
 	"github.com/xtls/xray-core/app/stats"
@@ -18,6 +15,9 @@ import (
 	"github.com/xtls/xray-core/common/net"
 	"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"
 )
 
 func TestServiceSubscribeRoutingStats(t *testing.T) {
@@ -81,7 +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
@@ -215,7 +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
@@ -319,7 +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) {
@@ -338,7 +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/condition.go

@@ -1,11 +1,9 @@
 package router
 
 import (
+	"regexp"
 	"strings"
 
-	"go.starlark.net/starlark"
-	"go.starlark.net/syntax"
-
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/strmatcher"
 	"github.com/xtls/xray-core/features/routing"
@@ -285,44 +283,22 @@ func (m *ProtocolMatcher) Apply(ctx routing.Context) bool {
 }
 
 type AttributeMatcher struct {
-	program *starlark.Program
-}
-
-func NewAttributeMatcher(code string) (*AttributeMatcher, error) {
-	starFile, err := syntax.Parse("attr.star", "satisfied=("+code+")", 0)
-	if err != nil {
-		return nil, newError("attr rule").Base(err)
-	}
-	p, err := starlark.FileProgram(starFile, func(name string) bool {
-		return name == "attrs"
-	})
-	if err != nil {
-		return nil, err
-	}
-	return &AttributeMatcher{
-		program: p,
-	}, nil
+	configuredKeys map[string]*regexp.Regexp
 }
 
 // Match implements attributes matching.
 func (m *AttributeMatcher) Match(attrs map[string]string) bool {
-	attrsDict := new(starlark.Dict)
+	// header keys are case insensitive most likely. So we do a convert
+	httpHeaders := make(map[string]string)
 	for key, value := range attrs {
-		attrsDict.SetKey(starlark.String(key), starlark.String(value))
+		httpHeaders[strings.ToLower(key)] = value
 	}
-
-	predefined := make(starlark.StringDict)
-	predefined["attrs"] = attrsDict
-
-	thread := &starlark.Thread{
-		Name: "matcher",
+	for key, regex := range m.configuredKeys {
+		if a, ok := httpHeaders[key]; !ok || !regex.MatchString(a) {
+			return false
 		}
-	results, err := m.program.Init(thread, predefined)
-	if err != nil {
-		newError("attr matcher").Base(err).WriteToLog()
 	}
-	satisfied := results["satisfied"]
-	return satisfied != nil && bool(satisfied.Truth())
+	return true
 }
 
 // Apply implements Condition.

app/router/condition_geoip.go

@@ -1,81 +1,49 @@
 package router
 
 import (
-	"encoding/binary"
-	"sort"
+	"net/netip"
+	"strconv"
 
 	"github.com/xtls/xray-core/common/net"
+	"go4.org/netipx"
 )
 
-type ipv6 struct {
-	a uint64
-	b uint64
-}
-
 type GeoIPMatcher struct {
 	countryCode  string
 	reverseMatch bool
-	ip4          []uint32
-	prefix4      []uint8
-	ip6          []ipv6
-	prefix6      []uint8
-}
-
-func normalize4(ip uint32, prefix uint8) uint32 {
-	return (ip >> (32 - prefix)) << (32 - prefix)
-}
-
-func normalize6(ip ipv6, prefix uint8) ipv6 {
-	if prefix <= 64 {
-		ip.a = (ip.a >> (64 - prefix)) << (64 - prefix)
-		ip.b = 0
-	} else {
-		ip.b = (ip.b >> (128 - prefix)) << (128 - prefix)
-	}
-	return ip
+	ip4          *netipx.IPSet
+	ip6          *netipx.IPSet
 }
 
 func (m *GeoIPMatcher) Init(cidrs []*CIDR) error {
-	ip4Count := 0
-	ip6Count := 0
+	var builder4, builder6 netipx.IPSetBuilder
 
 	for _, cidr := range cidrs {
-		ip := cidr.Ip
+		ip := net.IP(cidr.GetIp())
+		ipPrefixString := ip.String() + "/" + strconv.Itoa(int(cidr.GetPrefix()))
+		ipPrefix, err := netip.ParsePrefix(ipPrefixString)
+		if err != nil {
+			return err
+		}
+
 		switch len(ip) {
-		case 4:
-			ip4Count++
-		case 16:
-			ip6Count++
-		default:
-			return newError("unexpect ip length: ", len(ip))
+		case net.IPv4len:
+			builder4.AddPrefix(ipPrefix)
+		case net.IPv6len:
+			builder6.AddPrefix(ipPrefix)
 		}
 	}
 
-	cidrList := CIDRList(cidrs)
-	sort.Sort(&cidrList)
-
-	m.ip4 = make([]uint32, 0, ip4Count)
-	m.prefix4 = make([]uint8, 0, ip4Count)
-	m.ip6 = make([]ipv6, 0, ip6Count)
-	m.prefix6 = make([]uint8, 0, ip6Count)
-
-	for _, cidr := range cidrList {
-		ip := cidr.Ip
-		prefix := uint8(cidr.Prefix)
-		switch len(ip) {
-		case 4:
-			m.ip4 = append(m.ip4, normalize4(binary.BigEndian.Uint32(ip), prefix))
-			m.prefix4 = append(m.prefix4, prefix)
-		case 16:
-			ip6 := ipv6{
-				a: binary.BigEndian.Uint64(ip[0:8]),
-				b: binary.BigEndian.Uint64(ip[8:16]),
+	if ip4, err := builder4.IPSet(); err != nil {
+		return err
+	} else {
+		m.ip4 = ip4
 	}
-			ip6 = normalize6(ip6, prefix)
 
-			m.ip6 = append(m.ip6, ip6)
-			m.prefix6 = append(m.prefix6, prefix)
-		}
+	if ip6, err := builder6.IPSet(); err != nil {
+		return err
+	} else {
+		m.ip6 = ip6
 	}
 
 	return nil
@@ -85,91 +53,37 @@ func (m *GeoIPMatcher) SetReverseMatch(isReverseMatch bool) {
 	m.reverseMatch = isReverseMatch
 }
 
-func (m *GeoIPMatcher) match4(ip uint32) bool {
-	if len(m.ip4) == 0 {
+func (m *GeoIPMatcher) match4(ip net.IP) bool {
+	nip, ok := netipx.FromStdIP(ip)
+	if !ok {
 		return false
 	}
 
-	if ip < m.ip4[0] {
-		return false
-	}
-
-	size := uint32(len(m.ip4))
-	l := uint32(0)
-	r := size
-	for l < r {
-		x := ((l + r) >> 1)
-		if ip < m.ip4[x] {
-			r = x
-			continue
-		}
-
-		nip := normalize4(ip, m.prefix4[x])
-		if nip == m.ip4[x] {
-			return true
-		}
-
-		l = x + 1
-	}
-
-	return l > 0 && normalize4(ip, m.prefix4[l-1]) == m.ip4[l-1]
+	return m.ip4.Contains(nip)
 }
 
-func less6(a ipv6, b ipv6) bool {
-	return a.a < b.a || (a.a == b.a && a.b < b.b)
-}
-
-func (m *GeoIPMatcher) match6(ip ipv6) bool {
-	if len(m.ip6) == 0 {
+func (m *GeoIPMatcher) match6(ip net.IP) bool {
+	nip, ok := netipx.FromStdIP(ip)
+	if !ok {
 		return false
 	}
 
-	if less6(ip, m.ip6[0]) {
-		return false
-	}
-
-	size := uint32(len(m.ip6))
-	l := uint32(0)
-	r := size
-	for l < r {
-		x := (l + r) / 2
-		if less6(ip, m.ip6[x]) {
-			r = x
-			continue
-		}
-
-		if normalize6(ip, m.prefix6[x]) == m.ip6[x] {
-			return true
-		}
-
-		l = x + 1
-	}
-
-	return l > 0 && normalize6(ip, m.prefix6[l-1]) == m.ip6[l-1]
+	return m.ip6.Contains(nip)
 }
 
 // Match returns true if the given ip is included by the GeoIP.
 func (m *GeoIPMatcher) Match(ip net.IP) bool {
+	isMatched := false
 	switch len(ip) {
-	case 4:
+	case net.IPv4len:
+		isMatched = m.match4(ip)
+	case net.IPv6len:
+		isMatched = m.match6(ip)
+	}
 	if m.reverseMatch {
-			return !m.match4(binary.BigEndian.Uint32(ip))
-		}
-		return m.match4(binary.BigEndian.Uint32(ip))
-	case 16:
-		if m.reverseMatch {
-			return !m.match6(ipv6{
-				a: binary.BigEndian.Uint64(ip[0:8]),
-				b: binary.BigEndian.Uint64(ip[8:16]),
-			})
-		}
-		return m.match6(ipv6{
-			a: binary.BigEndian.Uint64(ip[0:8]),
-			b: binary.BigEndian.Uint64(ip[8:16]),
-		})
-	default:
-		return false
+		return !isMatched
 	}
+	return isMatched
 }
 
 // GeoIPMatcherContainer is a container for GeoIPMatchers. It keeps unique copies of GeoIPMatcher by country code.

app/router/condition_geoip_test.go

@@ -5,13 +5,12 @@ import (
 	"path/filepath"
 	"testing"
 
-	"github.com/golang/protobuf/proto"
-
 	"github.com/xtls/xray-core/app/router"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/common/platform"
 	"github.com/xtls/xray-core/common/platform/filesystem"
+	"google.golang.org/protobuf/proto"
 )
 
 func init() {
@@ -54,7 +53,7 @@ func TestGeoIPMatcherContainer(t *testing.T) {
 }
 
 func TestGeoIPMatcher(t *testing.T) {
-	cidrList := router.CIDRList{
+	cidrList := []*router.CIDR{
 		{Ip: []byte{0, 0, 0, 0}, Prefix: 8},
 		{Ip: []byte{10, 0, 0, 0}, Prefix: 8},
 		{Ip: []byte{100, 64, 0, 0}, Prefix: 10},
@@ -125,8 +124,40 @@ func TestGeoIPMatcher(t *testing.T) {
 	}
 }
 
+func TestGeoIPMatcherRegression(t *testing.T) {
+	cidrList := []*router.CIDR{
+		{Ip: []byte{98, 108, 20, 0}, Prefix: 22},
+		{Ip: []byte{98, 108, 20, 0}, Prefix: 23},
+	}
+
+	matcher := &router.GeoIPMatcher{}
+	common.Must(matcher.Init(cidrList))
+
+	testCases := []struct {
+		Input  string
+		Output bool
+	}{
+		{
+			Input:  "98.108.22.11",
+			Output: true,
+		},
+		{
+			Input:  "98.108.25.0",
+			Output: false,
+		},
+	}
+
+	for _, testCase := range testCases {
+		ip := net.ParseAddress(testCase.Input).IP()
+		actual := matcher.Match(ip)
+		if actual != testCase.Output {
+			t.Error("expect input", testCase.Input, "to be", testCase.Output, ", but actually", actual)
+		}
+	}
+}
+
 func TestGeoIPReverseMatcher(t *testing.T) {
-	cidrList := router.CIDRList{
+	cidrList := []*router.CIDR{
 		{Ip: []byte{8, 8, 8, 8}, Prefix: 32},
 		{Ip: []byte{91, 108, 4, 0}, Prefix: 16},
 	}

app/router/condition_test.go

@@ -6,8 +6,6 @@ import (
 	"strconv"
 	"testing"
 
-	"github.com/golang/protobuf/proto"
-
 	. "github.com/xtls/xray-core/app/router"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/errors"
@@ -19,6 +17,7 @@ import (
 	"github.com/xtls/xray-core/common/session"
 	"github.com/xtls/xray-core/features/routing"
 	routing_session "github.com/xtls/xray-core/features/routing/session"
+	"google.golang.org/protobuf/proto"
 )
 
 func init() {
@@ -309,7 +308,9 @@ func TestRoutingRule(t *testing.T) {
 		{
 			rule: &RoutingRule{
 				Protocol: []string{"http"},
-				Attributes: "attrs[':path'].startswith('/test')",
+				Attributes: map[string]string{
+					":path": "/test",
+				},
 			},
 			test: []ruleTest{
 				{
@@ -318,6 +319,19 @@ func TestRoutingRule(t *testing.T) {
 				},
 			},
 		},
+		{
+			rule: &RoutingRule{
+				Attributes: map[string]string{
+					"Custom": "p([a-z]+)ch",
+				},
+			},
+			test: []ruleTest{
+				{
+					input:  withContent(&session.Content{Attributes: map[string]string{"custom": "peach"}}),
+					output: true,
+				},
+			},
+		},
 	}
 
 	for _, test := range cases {

app/router/config.go

@@ -1,52 +1,17 @@
 package router
 
 import (
+	"regexp"
+	"strings"
+
 	"github.com/xtls/xray-core/common/net"
 	"github.com/xtls/xray-core/features/outbound"
 	"github.com/xtls/xray-core/features/routing"
 )
 
-// CIDRList is an alias of []*CIDR to provide sort.Interface.
-type CIDRList []*CIDR
-
-// Len implements sort.Interface.
-func (l *CIDRList) Len() int {
-	return len(*l)
-}
-
-// Less implements sort.Interface.
-func (l *CIDRList) Less(i int, j int) bool {
-	ci := (*l)[i]
-	cj := (*l)[j]
-
-	if len(ci.Ip) < len(cj.Ip) {
-		return true
-	}
-
-	if len(ci.Ip) > len(cj.Ip) {
-		return false
-	}
-
-	for k := 0; k < len(ci.Ip); k++ {
-		if ci.Ip[k] < cj.Ip[k] {
-			return true
-		}
-
-		if ci.Ip[k] > cj.Ip[k] {
-			return false
-		}
-	}
-
-	return ci.Prefix < cj.Prefix
-}
-
-// Swap implements sort.Interface.
-func (l *CIDRList) Swap(i int, j int) {
-	(*l)[i], (*l)[j] = (*l)[j], (*l)[i]
-}
-
 type Rule struct {
 	Tag       string
+	RuleTag   string
 	Balancer  *Balancer
 	Condition Condition
 }
@@ -143,11 +108,11 @@ func (rr *RoutingRule) BuildCondition() (Condition, error) {
 	}
 
 	if len(rr.Attributes) > 0 {
-		cond, err := NewAttributeMatcher(rr.Attributes)
-		if err != nil {
-			return nil, err
+		configuredKeys := make(map[string]*regexp.Regexp)
+		for key, value := range rr.Attributes {
+			configuredKeys[strings.ToLower(key)] = regexp.MustCompile(value)
 		}
-		conds.Add(cond)
+		conds.Add(&AttributeMatcher{configuredKeys})
 	}
 
 	if conds.Len() == 0 {
@@ -157,22 +122,49 @@ 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{},
+			fallbackTag: br.FallbackTag,
 			ohm:         ohm,
 		}, nil
+	case "roundrobin":
+		return &Balancer{
+			selectors:   br.OutboundSelector,
+			strategy:    &RoundRobinStrategy{},
+			fallbackTag: br.FallbackTag,
+			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
-	default:
+	case "":
 		return &Balancer{
 			selectors:   br.OutboundSelector,
-			strategy:  &RandomStrategy{},
 			ohm:         ohm,
+			fallbackTag: br.FallbackTag,
+			strategy:    &RandomStrategy{},
 		}, nil
-
+	default:
+		return nil, newError("unrecognized balancer type")
 	}
 }

app/router/config.pb.go

@@ -1,13 +1,14 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/router/config.proto
 
 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.
@@ -477,15 +478,17 @@ type RoutingRule struct {
 	unknownFields protoimpl.UnknownFields
 
 	// Types that are assignable to TargetTag:
+	//
 	//	*RoutingRule_Tag
 	//	*RoutingRule_BalancingTag
 	TargetTag isRoutingRule_TargetTag `protobuf_oneof:"target_tag"`
+	RuleTag   string                  `protobuf:"bytes,18,opt,name=rule_tag,json=ruleTag,proto3" json:"rule_tag,omitempty"`
 	// List of domains for target domain matching.
 	Domain []*Domain `protobuf:"bytes,2,rep,name=domain,proto3" json:"domain,omitempty"`
 	// List of CIDRs for target IP address matching.
 	// Deprecated. Use geoip below.
 	//
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in app/router/config.proto.
 	Cidr []*CIDR `protobuf:"bytes,3,rep,name=cidr,proto3" json:"cidr,omitempty"`
 	// List of GeoIPs for target IP address matching. If this entry exists, the
 	// cidr above will have no effect. GeoIP fields with the same country code are
@@ -495,19 +498,19 @@ type RoutingRule struct {
 	// A range of port [from, to]. If the destination port is in this range, this
 	// rule takes effect. Deprecated. Use port_list.
 	//
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in app/router/config.proto.
 	PortRange *net.PortRange `protobuf:"bytes,4,opt,name=port_range,json=portRange,proto3" json:"port_range,omitempty"`
 	// List of ports.
 	PortList *net.PortList `protobuf:"bytes,14,opt,name=port_list,json=portList,proto3" json:"port_list,omitempty"`
 	// List of networks. Deprecated. Use networks.
 	//
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in app/router/config.proto.
 	NetworkList *net.NetworkList `protobuf:"bytes,5,opt,name=network_list,json=networkList,proto3" json:"network_list,omitempty"`
 	// List of networks for matching.
 	Networks []net.Network `protobuf:"varint,13,rep,packed,name=networks,proto3,enum=xray.common.net.Network" json:"networks,omitempty"`
 	// List of CIDRs for source IP address matching.
 	//
-	// Deprecated: Do not use.
+	// Deprecated: Marked as deprecated in app/router/config.proto.
 	SourceCidr []*CIDR `protobuf:"bytes,6,rep,name=source_cidr,json=sourceCidr,proto3" json:"source_cidr,omitempty"`
 	// List of GeoIPs for source IP address matching. If this entry exists, the
 	// source_cidr above will have no effect.
@@ -517,7 +520,7 @@ type RoutingRule struct {
 	UserEmail      []string          `protobuf:"bytes,7,rep,name=user_email,json=userEmail,proto3" json:"user_email,omitempty"`
 	InboundTag     []string          `protobuf:"bytes,8,rep,name=inbound_tag,json=inboundTag,proto3" json:"inbound_tag,omitempty"`
 	Protocol       []string          `protobuf:"bytes,9,rep,name=protocol,proto3" json:"protocol,omitempty"`
-	Attributes     string        `protobuf:"bytes,15,opt,name=attributes,proto3" json:"attributes,omitempty"`
+	Attributes     map[string]string `protobuf:"bytes,15,rep,name=attributes,proto3" json:"attributes,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 	DomainMatcher  string            `protobuf:"bytes,17,opt,name=domain_matcher,json=domainMatcher,proto3" json:"domain_matcher,omitempty"`
 }
 
@@ -574,6 +577,13 @@ func (x *RoutingRule) GetBalancingTag() string {
 	return ""
 }
 
+func (x *RoutingRule) GetRuleTag() string {
+	if x != nil {
+		return x.RuleTag
+	}
+	return ""
+}
+
 func (x *RoutingRule) GetDomain() []*Domain {
 	if x != nil {
 		return x.Domain
@@ -581,7 +591,7 @@ func (x *RoutingRule) GetDomain() []*Domain {
 	return nil
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in app/router/config.proto.
 func (x *RoutingRule) GetCidr() []*CIDR {
 	if x != nil {
 		return x.Cidr
@@ -596,7 +606,7 @@ func (x *RoutingRule) GetGeoip() []*GeoIP {
 	return nil
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in app/router/config.proto.
 func (x *RoutingRule) GetPortRange() *net.PortRange {
 	if x != nil {
 		return x.PortRange
@@ -611,7 +621,7 @@ func (x *RoutingRule) GetPortList() *net.PortList {
 	return nil
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in app/router/config.proto.
 func (x *RoutingRule) GetNetworkList() *net.NetworkList {
 	if x != nil {
 		return x.NetworkList
@@ -626,7 +636,7 @@ func (x *RoutingRule) GetNetworks() []net.Network {
 	return nil
 }
 
-// Deprecated: Do not use.
+// Deprecated: Marked as deprecated in app/router/config.proto.
 func (x *RoutingRule) GetSourceCidr() []*CIDR {
 	if x != nil {
 		return x.SourceCidr
@@ -669,11 +679,11 @@ func (x *RoutingRule) GetProtocol() []string {
 	return nil
 }
 
-func (x *RoutingRule) GetAttributes() string {
+func (x *RoutingRule) GetAttributes() map[string]string {
 	if x != nil {
 		return x.Attributes
 	}
-	return ""
+	return nil
 }
 
 func (x *RoutingRule) GetDomainMatcher() string {
@@ -709,6 +719,8 @@ type BalancingRule struct {
 	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() {
@@ -764,6 +776,167 @@ 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
@@ -777,7 +950,7 @@ 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)
 	}
@@ -790,7 +963,7 @@ 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 {
@@ -803,7 +976,7 @@ 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 {
@@ -834,6 +1007,7 @@ type Domain_Attribute struct {
 
 	Key string `protobuf:"bytes,1,opt,name=key,proto3" json:"key,omitempty"`
 	// Types that are assignable to TypedValue:
+	//
 	//	*Domain_Attribute_BoolValue
 	//	*Domain_Attribute_IntValue
 	TypedValue isDomain_Attribute_TypedValue `protobuf_oneof:"typed_value"`
@@ -842,7 +1016,7 @@ 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)
 	}
@@ -855,7 +1029,7 @@ 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 {
@@ -920,136 +1094,171 @@ var File_app_router_config_proto protoreflect.FileDescriptor
 var file_app_router_config_proto_rawDesc = []byte{
 	0x0a, 0x17, 0x61, 0x70, 0x70, 0x2f, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x2f, 0x63, 0x6f, 0x6e,
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+	0x61, 0x78, 0x52, 0x54, 0x54, 0x18, 0x05, 0x20, 0x01, 0x28, 0x03, 0x52, 0x06, 0x6d, 0x61, 0x78,
+	0x52, 0x54, 0x54, 0x12, 0x1c, 0x0a, 0x09, 0x74, 0x6f, 0x6c, 0x65, 0x72, 0x61, 0x6e, 0x63, 0x65,
+	0x18, 0x06, 0x20, 0x01, 0x28, 0x02, 0x52, 0x09, 0x74, 0x6f, 0x6c, 0x65, 0x72, 0x61, 0x6e, 0x63,
+	0x65, 0x22, 0x9b, 0x02, 0x0a, 0x06, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x12, 0x4f, 0x0a, 0x0f,
+	0x64, 0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x5f, 0x73, 0x74, 0x72, 0x61, 0x74, 0x65, 0x67, 0x79, 0x18,
+	0x01, 0x20, 0x01, 0x28, 0x0e, 0x32, 0x26, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70,
+	0x2e, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x2e, 0x43, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2e, 0x44,
+	0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x53, 0x74, 0x72, 0x61, 0x74, 0x65, 0x67, 0x79, 0x52, 0x0e, 0x64,
+	0x6f, 0x6d, 0x61, 0x69, 0x6e, 0x53, 0x74, 0x72, 0x61, 0x74, 0x65, 0x67, 0x79, 0x12, 0x30, 0x0a,
+	0x04, 0x72, 0x75, 0x6c, 0x65, 0x18, 0x02, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x1c, 0x2e, 0x78, 0x72,
+	0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x2e, 0x52, 0x6f,
+	0x75, 0x74, 0x69, 0x6e, 0x67, 0x52, 0x75, 0x6c, 0x65, 0x52, 0x04, 0x72, 0x75, 0x6c, 0x65, 0x12,
+	0x45, 0x0a, 0x0e, 0x62, 0x61, 0x6c, 0x61, 0x6e, 0x63, 0x69, 0x6e, 0x67, 0x5f, 0x72, 0x75, 0x6c,
+	0x65, 0x18, 0x03, 0x20, 0x03, 0x28, 0x0b, 0x32, 0x1e, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61,
+	0x70, 0x70, 0x2e, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x2e, 0x42, 0x61, 0x6c, 0x61, 0x6e, 0x63,
+	0x69, 0x6e, 0x67, 0x52, 0x75, 0x6c, 0x65, 0x52, 0x0d, 0x62, 0x61, 0x6c, 0x61, 0x6e, 0x63, 0x69,
+	0x6e, 0x67, 0x52, 0x75, 0x6c, 0x65, 0x22, 0x47, 0x0a, 0x0e, 0x44, 0x6f, 0x6d, 0x61, 0x69, 0x6e,
+	0x53, 0x74, 0x72, 0x61, 0x74, 0x65, 0x67, 0x79, 0x12, 0x08, 0x0a, 0x04, 0x41, 0x73, 0x49, 0x73,
+	0x10, 0x00, 0x12, 0x09, 0x0a, 0x05, 0x55, 0x73, 0x65, 0x49, 0x70, 0x10, 0x01, 0x12, 0x10, 0x0a,
+	0x0c, 0x49, 0x70, 0x49, 0x66, 0x4e, 0x6f, 0x6e, 0x4d, 0x61, 0x74, 0x63, 0x68, 0x10, 0x02, 0x12,
+	0x0e, 0x0a, 0x0a, 0x49, 0x70, 0x4f, 0x6e, 0x44, 0x65, 0x6d, 0x61, 0x6e, 0x64, 0x10, 0x03, 0x42,
+	0x4f, 0x0a, 0x13, 0x63, 0x6f, 0x6d, 0x2e, 0x78, 0x72, 0x61, 0x79, 0x2e, 0x61, 0x70, 0x70, 0x2e,
+	0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0x50, 0x01, 0x5a, 0x24, 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, 0x72, 0x6f, 0x75, 0x74, 0x65, 0x72, 0xaa, 0x02,
+	0x0f, 0x58, 0x72, 0x61, 0x79, 0x2e, 0x41, 0x70, 0x70, 0x2e, 0x52, 0x6f, 0x75, 0x74, 0x65, 0x72,
+	0x62, 0x06, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
@@ -1065,7 +1274,7 @@ 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, 10)
+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
@@ -1077,16 +1286,20 @@ var file_app_router_config_proto_goTypes = []interface{}{
 	(*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
-	(*net.PortRange)(nil),      // 12: xray.common.net.PortRange
-	(*net.PortList)(nil),       // 13: xray.common.net.PortList
-	(*net.NetworkList)(nil),    // 14: xray.common.net.NetworkList
-	(net.Network)(0),           // 15: xray.common.net.Network
+	(*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
@@ -1094,21 +1307,24 @@ 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
-	12, // 9: xray.app.router.RoutingRule.port_range:type_name -> xray.common.net.PortRange
-	13, // 10: xray.app.router.RoutingRule.port_list:type_name -> xray.common.net.PortList
-	14, // 11: xray.app.router.RoutingRule.network_list:type_name -> xray.common.net.NetworkList
-	15, // 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
-	13, // 15: xray.app.router.RoutingRule.source_port_list:type_name -> xray.common.net.PortList
-	1,  // 16: xray.app.router.Config.domain_strategy:type_name -> xray.app.router.Config.DomainStrategy
-	8,  // 17: xray.app.router.Config.rule:type_name -> xray.app.router.RoutingRule
-	9,  // 18: xray.app.router.Config.balancing_rule:type_name -> xray.app.router.BalancingRule
-	19, // [19:19] is the sub-list for method output_type
-	19, // [19:19] is the sub-list for method input_type
-	19, // [19:19] is the sub-list for extension type_name
-	19, // [19:19] is the sub-list for extension extendee
-	0,  // [0:19] 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() }
@@ -1214,7 +1430,7 @@ 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:
@@ -1226,6 +1442,30 @@ 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
@@ -1242,7 +1482,7 @@ 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),
 	}
@@ -1252,7 +1492,7 @@ func file_app_router_config_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_app_router_config_proto_rawDesc,
 			NumEnums:      2,
-			NumMessages:   10,
+			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";
 
@@ -78,6 +79,7 @@ message RoutingRule {
     // Tag of routing balancer.
     string balancing_tag = 12;
   }
+    string rule_tag = 18;
 
   // List of domains for target domain matching.
   repeated Domain domain = 2;
@@ -119,7 +121,7 @@ message RoutingRule {
   repeated string inbound_tag = 8;
   repeated string protocol = 9;
 
-  string attributes = 15;
+  map<string, string> attributes = 15;
 
   string domain_matcher = 17;
 }
@@ -128,6 +130,27 @@ 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

@@ -4,8 +4,10 @@ package router
 
 import (
 	"context"
+	sync "sync"
 
 	"github.com/xtls/xray-core/common"
+	"github.com/xtls/xray-core/common/serial"
 	"github.com/xtls/xray-core/core"
 	"github.com/xtls/xray-core/features/dns"
 	"github.com/xtls/xray-core/features/outbound"
@@ -19,6 +21,11 @@ type Router struct {
 	rules          []*Rule
 	balancers      map[string]*Balancer
 	dns            dns.Client
+
+	ctx        context.Context
+	ohm        outbound.Manager
+	dispatcher routing.Dispatcher
+	mu         sync.Mutex
 }
 
 // Route is an implementation of routing.Route.
@@ -29,13 +36,16 @@ 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.ctx = ctx
+	r.ohm = ohm
+	r.dispatcher = dispatcher
 
 	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
 		}
@@ -52,6 +62,7 @@ func (r *Router) Init(ctx context.Context, config *Config, d dns.Client, ohm out
 		rr := &Rule{
 			Condition: cond,
 			Tag:       rule.GetTag(),
+			RuleTag:   rule.GetRuleTag(),
 		}
 		btag := rule.GetBalancingTag()
 		if len(btag) > 0 {
@@ -80,6 +91,96 @@ func (r *Router) PickRoute(ctx routing.Context) (routing.Route, error) {
 	return &Route{Context: ctx, outboundTag: tag}, nil
 }
 
+// AddRule implements routing.Router.
+func (r *Router) AddRule(config *serial.TypedMessage, shouldAppend bool) error {
+
+	inst, err := config.GetInstance()
+	if err != nil {
+		return err
+	}
+	if c, ok := inst.(*Config); ok {
+		return r.ReloadRules(c, shouldAppend)
+	}
+	return newError("AddRule: config type error")
+}
+
+func (r *Router) ReloadRules(config *Config, shouldAppend bool) error {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	if !shouldAppend {
+		r.balancers = make(map[string]*Balancer, len(config.BalancingRule))
+		r.rules = make([]*Rule, 0, len(config.Rule))
+	}
+	for _, rule := range config.BalancingRule {
+		_, found := r.balancers[rule.Tag]
+		if found {
+			return newError("duplicate balancer tag")
+		}
+		balancer, err := rule.Build(r.ohm, r.dispatcher)
+		if err != nil {
+			return err
+		}
+		balancer.InjectContext(r.ctx)
+		r.balancers[rule.Tag] = balancer
+	}
+
+	for _, rule := range config.Rule {
+		if r.RuleExists(rule.GetRuleTag()) {
+			return newError("duplicate ruleTag ", rule.GetRuleTag())
+		}
+		cond, err := rule.BuildCondition()
+		if err != nil {
+			return err
+		}
+		rr := &Rule{
+			Condition: cond,
+			Tag:       rule.GetTag(),
+			RuleTag:   rule.GetRuleTag(),
+		}
+		btag := rule.GetBalancingTag()
+		if len(btag) > 0 {
+			brule, found := r.balancers[btag]
+			if !found {
+				return newError("balancer ", btag, " not found")
+			}
+			rr.Balancer = brule
+		}
+		r.rules = append(r.rules, rr)
+	}
+
+	return nil
+}
+
+func (r *Router) RuleExists(tag string) bool {
+	if tag != "" {
+		for _, rule := range r.rules {
+			if rule.RuleTag == tag {
+				return true
+			}
+		}
+	}
+	return false
+}
+
+// RemoveRule implements routing.Router.
+func (r *Router) RemoveRule(tag string) error {
+	r.mu.Lock()
+	defer r.mu.Unlock()
+
+	newRules := []*Rule{}
+	if tag != "" {
+		for _, rule := range r.rules {
+			if rule.RuleTag != tag {
+				newRules = append(newRules, rule)
+			}
+		}
+		r.rules = newRules
+		return nil
+	}
+	return newError("empty tag name!")
+
+}
 func (r *Router) pickRouteInternal(ctx routing.Context) (*Rule, routing.Context, error) {
 	// SkipDNSResolve is set from DNS module.
 	// the DOH remote server maybe a domain name,
@@ -113,12 +214,12 @@ 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 +241,8 @@ 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

@@ -5,7 +5,6 @@ import (
 	"testing"
 
 	"github.com/golang/mock/gomock"
-
 	. "github.com/xtls/xray-core/app/router"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/net"
@@ -44,7 +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))
@@ -85,7 +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))
@@ -95,6 +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,
@@ -124,7 +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))
@@ -163,7 +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))
@@ -197,7 +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
 }
@@ -45,7 +49,7 @@ func (l *LeastPingStrategy) PickOutbound(strings []string) string {
 		return selectedOutboundName
 	}
 
-	//No way to understand observeReport
+	// No way to understand observeReport
 	return ""
 }
 

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.go

@@ -7,13 +7,12 @@ import (
 	"runtime"
 	"time"
 
-	grpc "google.golang.org/grpc"
-
 	"github.com/xtls/xray-core/app/stats"
 	"github.com/xtls/xray-core/common"
 	"github.com/xtls/xray-core/common/strmatcher"
 	"github.com/xtls/xray-core/core"
 	feature_stats "github.com/xtls/xray-core/features/stats"
+	grpc "google.golang.org/grpc"
 )
 
 // statsServer is an implementation of StatsService.

app/stats/command/command.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go. DO NOT EDIT.
 // versions:
-// 	protoc-gen-go v1.27.1
-// 	protoc        v3.18.0
+// 	protoc-gen-go v1.33.0
+// 	protoc        v4.23.1
 // source: app/stats/command/command.proto
 
 package command

app/stats/command/command_grpc.pb.go

@@ -1,7 +1,7 @@
 // Code generated by protoc-gen-go-grpc. DO NOT EDIT.
 // versions:
-// - protoc-gen-go-grpc v1.2.0
-// - protoc             v3.18.0
+// - protoc-gen-go-grpc v1.3.0
+// - protoc             v4.23.1
 // source: app/stats/command/command.proto
 
 package command
@@ -18,6 +18,12 @@ import (
 // Requires gRPC-Go v1.32.0 or later.
 const _ = grpc.SupportPackageIsVersion7
 
+const (
+	StatsService_GetStats_FullMethodName    = "/xray.app.stats.command.StatsService/GetStats"
+	StatsService_QueryStats_FullMethodName  = "/xray.app.stats.command.StatsService/QueryStats"
+	StatsService_GetSysStats_FullMethodName = "/xray.app.stats.command.StatsService/GetSysStats"
+)
+
 // StatsServiceClient is the client API for StatsService service.
 //
 // For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
@@ -37,7 +43,7 @@ func NewStatsServiceClient(cc grpc.ClientConnInterface) StatsServiceClient {
 
 func (c *statsServiceClient) GetStats(ctx context.Context, in *GetStatsRequest, opts ...grpc.CallOption) (*GetStatsResponse, error) {
 	out := new(GetStatsResponse)
-	err := c.cc.Invoke(ctx, "/xray.app.stats.command.StatsService/GetStats", in, out, opts...)
+	err := c.cc.Invoke(ctx, StatsService_GetStats_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -46,7 +52,7 @@ func (c *statsServiceClient) GetStats(ctx context.Context, in *GetStatsRequest,
 
 func (c *statsServiceClient) QueryStats(ctx context.Context, in *QueryStatsRequest, opts ...grpc.CallOption) (*QueryStatsResponse, error) {
 	out := new(QueryStatsResponse)
-	err := c.cc.Invoke(ctx, "/xray.app.stats.command.StatsService/QueryStats", in, out, opts...)
+	err := c.cc.Invoke(ctx, StatsService_QueryStats_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -55,7 +61,7 @@ func (c *statsServiceClient) QueryStats(ctx context.Context, in *QueryStatsReque
 
 func (c *statsServiceClient) GetSysStats(ctx context.Context, in *SysStatsRequest, opts ...grpc.CallOption) (*SysStatsResponse, error) {
 	out := new(SysStatsResponse)
-	err := c.cc.Invoke(ctx, "/xray.app.stats.command.StatsService/GetSysStats", in, out, opts...)
+	err := c.cc.Invoke(ctx, StatsService_GetSysStats_FullMethodName, in, out, opts...)
 	if err != nil {
 		return nil, err
 	}
@@ -108,7 +114,7 @@ func _StatsService_GetStats_Handler(srv interface{}, ctx context.Context, dec fu
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/xray.app.stats.command.StatsService/GetStats",
+		FullMethod: StatsService_GetStats_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(StatsServiceServer).GetStats(ctx, req.(*GetStatsRequest))
@@ -126,7 +132,7 @@ func _StatsService_QueryStats_Handler(srv interface{}, ctx context.Context, dec
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/xray.app.stats.command.StatsService/QueryStats",
+		FullMethod: StatsService_QueryStats_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(StatsServiceServer).QueryStats(ctx, req.(*QueryStatsRequest))
@@ -144,7 +150,7 @@ func _StatsService_GetSysStats_Handler(srv interface{}, ctx context.Context, dec
 	}
 	info := &grpc.UnaryServerInfo{
 		Server:     srv,
-		FullMethod: "/xray.app.stats.command.StatsService/GetSysStats",
+		FullMethod: StatsService_GetSysStats_FullMethodName,
 	}
 	handler := func(ctx context.Context, req interface{}) (interface{}, error) {
 		return srv.(StatsServiceServer).GetSysStats(ctx, req.(*SysStatsRequest))