Merge pull request #1332 from apernet/add-license

chore: add LICENSE to packages

.github/FUNDING.yml

@@ -0,0 +1 @@
+custom: [ 'https://v2.hysteria.network/docs/Donation/' ]

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,26 @@
+---
+name: Bug report
+about: Report anything you think is a bug and needs to be fixed.
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**Describe the bug**
+A clear and concise description of what the bug is.
+
+**To Reproduce**
+Steps to reproduce the behavior.
+
+**Expected behavior**
+A clear and concise description of what you expected to happen.
+
+**Logs**
+Attach logs from the client/server when the error occurs.
+
+**Device and Operating System**
+What are you using it on.
+
+**Additional context**
+Add any other context about the problem here.

.github/ISSUE_TEMPLATE/bug_report.zh.md

@@ -0,0 +1,26 @@
+---
+name: Bug 反馈
+about: 反馈任何你认为是 bug 需要修复的问题。
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+**描述问题**
+请尽量清晰精准地描述你遇到的问题。
+
+**如何复现**
+复现问题的步骤。
+
+**预期行为**
+你认为修复后的行为应该是怎样的。
+
+**日志**
+附上客户端/服务器端在错误发生前后的日志。
+
+**设备和操作系统**
+你在用什么设备和操作系统。
+
+**额外信息**
+其他你认为有助于解决问题的信息。

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,20 @@
+---
+name: Feature request
+about: Suggest an idea for this project.
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/feature_request.zh.md

@@ -0,0 +1,20 @@
+---
+name: 功能请求
+about: 为这个项目提出改进意见。
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**你的功能请求是否与某个问题有关？**
+请尽量清晰精准地描述你遇到的问题。例如：我家运营商限制 UDP 协议速度，导致 Hysteria 很慢，希望增加 FakeTCP 支持。
+
+**描述你希望的解决方案**
+请尽量清晰精准地描述你希望的解决方案。
+
+**有没有其他替代方案**
+请尽量清晰精准地描述你认为可能的替代方案。
+
+**额外信息**
+其他你认为有助于开发者了解你需求的信息。

.github/dependabot.yml

@@ -0,0 +1,10 @@
+version: 2
+updates:
+  - package-ecosystem: "gomod"
+    directory: "/"
+    schedule:
+      interval: "daily"
+  - package-ecosystem: "github-actions"
+    directory: "/"
+    schedule:
+      interval: "daily"

.github/workflows/autotag.yaml

@@ -0,0 +1,104 @@
+name: "Create release tags for nested modules"
+
+on:
+  push:
+    tags:
+      - app/v*.*.*
+
+permissions:
+  contents: write
+
+jobs:
+  tag:
+    name: "Create tags"
+    runs-on: ubuntu-latest
+    steps:
+      - name: "Extract tagbase"
+        id: extract_tagbase
+        uses: actions/github-script@v7
+        with:
+          script: |
+            const ref = context.ref;
+            core.info(`context.ref: ${ref}`);
+            const refPrefix = 'refs/tags/app/';
+            if (!ref.startsWith(refPrefix)) {
+              core.setFailed(`context.ref does not start with ${refPrefix}: ${ref}`);
+              return;
+            }
+            const tagbase = ref.slice(refPrefix.length);
+            core.info(`tagbase: ${tagbase}`);
+            core.setOutput('tagbase', tagbase);
+
+      - name: "Tagging core/*"
+        uses: actions/github-script@v7
+        env:
+          INPUT_TAGPREFIX: "core/"
+          INPUT_TAGBASE: ${{ steps.extract_tagbase.outputs.tagbase }}
+        with:
+          script: |
+            const tagbase = core.getInput('tagbase', { required: true });
+            const tagprefix = core.getInput('tagprefix', { required: true });
+            const refname = `tags/${tagprefix}${tagbase}`;
+            core.info(`creating ref ${refname}`);
+            try {
+              await github.rest.git.createRef({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                ref: `refs/${refname}`,
+                sha: context.sha
+              });
+              core.info(`created ref ${refname}`);
+              return;
+            } catch (error) {
+              core.info(`failed to create ref ${refname}: ${error}`);
+            }
+            core.info(`updating ref ${refname}`)
+            try {
+              await github.rest.git.updateRef({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                ref: refname,
+                sha: context.sha
+              });
+              core.info(`updated ref ${refname}`);
+              return;
+            } catch (error) {
+              core.setFailed(`failed to update ref ${refname}: ${error}`);
+            }
+
+      - name: "Tagging extras/*"
+        uses: actions/github-script@v7
+        env:
+          INPUT_TAGPREFIX: "extras/"
+          INPUT_TAGBASE: ${{ steps.extract_tagbase.outputs.tagbase }}
+        with:
+          script: |
+            const tagbase = core.getInput('tagbase', { required: true });
+            const tagprefix = core.getInput('tagprefix', { required: true });
+            const refname = `tags/${tagprefix}${tagbase}`;
+            core.info(`creating ref ${refname}`);
+            try {
+              await github.rest.git.createRef({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                ref: `refs/${refname}`,
+                sha: context.sha
+              });
+              core.info(`created ref ${refname}`);
+              return;
+            } catch (error) {
+              core.info(`failed to create ref ${refname}: ${error}`);
+            }
+            core.info(`updating ref ${refname}`)
+            try {
+              await github.rest.git.updateRef({
+                owner: context.repo.owner,
+                repo: context.repo.repo,
+                ref: refname,
+                sha: context.sha
+              });
+              core.info(`updated ref ${refname}`);
+              return;
+            } catch (error) {
+              core.setFailed(`failed to update ref ${refname}: ${error}`);
+            }

.github/workflows/docker.yml

@@ -0,0 +1,44 @@
+name: "Build Docker Image"
+
+on:
+  push:
+    tags:
+      - app/v*.*.*
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    env:
+      ACTIONS_ALLOW_UNSECURE_COMMANDS: true
+
+    steps:
+      - name: Check out
+        uses: actions/checkout@v4
+
+      - name: Get version
+        id: get_version
+        run: echo "version=$(git describe --tags --always --match 'app/v*' | sed -n 's|app/\([^/-]*\)\(-.*\)\{0,1\}|\1|p')" >> $GITHUB_OUTPUT
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to DockerHub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+
+      - name: Build and push
+        id: docker_build
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          push: true
+          platforms: linux/amd64,linux/arm64
+          tags: tobyxdd/hysteria:latest,tobyxdd/hysteria:v2,tobyxdd/hysteria:${{ steps.get_version.outputs.version }}
+
+      - name: Image digest
+        run: echo ${{ steps.docker_build.outputs.digest }}

.github/workflows/master.yml

@@ -0,0 +1,52 @@
+name: "Build master branch"
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    env:
+      ACTIONS_ALLOW_UNSECURE_COMMANDS: true
+
+    steps:
+      - name: Check out
+        uses: actions/checkout@v4
+
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.23"
+
+      - name: Setup Python # This is for the build script
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
+
+      - uses: nttld/setup-ndk@v1
+        id: setup-ndk
+        with:
+          ndk-version: r26b
+          add-to-path: false
+
+      - name: Run build script
+        env:
+          ANDROID_NDK_HOME: ${{ steps.setup-ndk.outputs.ndk-path }}
+        run: |
+          export HY_APP_PLATFORMS=$(sed 's/\r$//' platforms.txt | awk '!/^#/ && !/^$/' | paste -sd ",")
+          python hyperbole.py build -r
+
+      - name: Generate hashes
+        run: |
+          for file in build/*; do
+            sha256sum $file >> build/hashes.txt
+          done
+
+      - name: Archive
+        uses: actions/upload-artifact@v4
+        with:
+          name: hysteria-master-${{ github.sha }}
+          path: build

.github/workflows/release.yml

@@ -1,61 +1,71 @@
-name: Build and release
+name: "Build release"
 
 on:
   push:
     tags:
-      - 'v*'
+      - app/v*.*.*
 
 jobs:
-
   build:
-    name: Build and release
+    name: Build
     runs-on: ubuntu-latest
+    env:
+      ACTIONS_ALLOW_UNSECURE_COMMANDS: true
+
     steps:
-
-      - name: Set up Go 1.14
-        uses: actions/setup-go@v1
-        with:
-          go-version: 1.14
-        id: go
-
       - name: Check out
-        uses: actions/checkout@v2
+        uses: actions/checkout@v4
 
-      - name: Get dependencies
-        run: |
-          go get -v -t -d ./...
-          if [ -f Gopkg.toml ]; then
-              curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh
-              dep ensure
-          fi
+      - name: Get version
+        id: get_version
+        run: echo "version=$(git describe --tags --always --match 'app/v*' | sed -n 's|app/\([^/-]*\)\(-.*\)\{0,1\}|\1|p')" >> $GITHUB_OUTPUT
 
-      - name: Get tag
-        uses: olegtarasov/get-tag@v2
-        id: tagName
+      - name: Setup Go
+        uses: actions/setup-go@v5
+        with:
+          go-version: "1.23"
 
-      - name: Get time
-        uses: gerred/actions/current-time@master
-        id: current-time
+      - name: Setup Python # This is for the build script
+        uses: actions/setup-python@v5
+        with:
+          python-version: "3.11"
 
-      - name: Build
-        uses: izumin5210/action-go-crossbuild@v1.0.0
+      - uses: nttld/setup-ndk@v1
+        id: setup-ndk
+        with:
+          ndk-version: r26b
+          add-to-path: false
+
+      - name: Run build script
         env:
-          TIME: "${{ steps.current-time.outputs.time }}"
-        with:
-          name: hysteria
-          arch: amd64
-          dest: ./dist/
-          ldflags: -w -s -X main.appVersion=${{ env.GIT_TAG_NAME }} -X main.appCommit=${{ github.sha }} -X main.appDate=${{ env.TIME }}
-          os: windows,linux,darwin
-          package: ./cmd
+          ANDROID_NDK_HOME: ${{ steps.setup-ndk.outputs.ndk-path }}
+        run: |
+          export HY_APP_PLATFORMS=$(sed 's/\r$//' platforms.txt | awk '!/^#/ && !/^$/' | paste -sd ",")
+          python hyperbole.py build -r
 
-      - name: Upload
-        uses: meeDamian/github-release@2.0
+      - name: Generate hashes
+        run: |
+          for file in build/*; do
+            sha256sum $file >> build/hashes.txt
+          done
+
+      - name: Upload GitHub
+        uses: softprops/action-gh-release@v2
         with:
-          token: ${{ secrets.GITHUB_TOKEN }}
-          gzip: false
-          allow_override: true
-          files: >
-            ./dist/hysteria_windows_amd64.zip
-            ./dist/hysteria_linux_amd64.tar.gz
-            ./dist/hysteria_darwin_amd64.zip
+          files: build/*
+
+      - name: Upload CF bucket
+        uses: shallwefootball/upload-s3-action@v1.3.3
+        with:
+          aws_key_id: ${{ secrets.CF_KEY_ID }}
+          aws_secret_access_key: ${{ secrets.CF_KEY }}
+          aws_bucket: "hydownload"
+          endpoint: "https://bea223c61d5a41250d127bd67f51dfec.r2.cloudflarestorage.com/"
+          source_dir: "build"
+          destination_dir: "app/${{ steps.get_version.outputs.version }}"
+
+      - name: Publish to API
+        run: |
+          export HY_API_POST_KEY=${{ secrets.HY2_API_POST_KEY }}
+          pip install requests
+          python hyperbole.py publish

.github/workflows/scripts.yml

@@ -0,0 +1,29 @@
+name: "Publish scripts"
+
+on:
+  push:
+    branches:
+      - master
+    paths:
+      - scripts/**
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      deployments: write
+    name: Publish scripts to Cloudflare Pages
+    steps:
+      - name: Check out
+        uses: actions/checkout@v4
+
+      - name: Publish to Cloudflare Pages
+        uses: cloudflare/pages-action@v1
+        with:
+          apiToken: ${{ secrets.CLOUDFLARE_API_TOKEN }}
+          accountId: ${{ secrets.CLOUDFLARE_ACCOUNT_ID }}
+          projectName: hy2scripts
+          directory: scripts
+          gitHubToken: ${{ secrets.GITHUB_TOKEN }}
+          branch: main

.gitignore

@@ -1,7 +1,10 @@
-# Created by https://www.gitignore.io/api/go,linux,macos,windows,intellij+all
-# Edit at https://www.gitignore.io/?templates=go,linux,macos,windows,intellij+all
+# Created by https://www.toptal.com/developers/gitignore/api/goland+all,intellij+all,go,windows,linux,macos,python,pycharm+all
+# Edit at https://www.toptal.com/developers/gitignore?templates=goland+all,intellij+all,go,windows,linux,macos,python,pycharm+all
 
 ### Go ###
+# If you prefer the allow list template instead of the deny list, see community template:
+# https://github.com/github/gitignore/blob/main/community/Golang/Go.AllowList.gitignore
+#
 # Binaries for programs and plugins
 *.exe
 *.exe~
@@ -18,12 +21,11 @@
 # Dependency directories (remove the comment below to include it)
 # vendor/
 
-### Go Patch ###
-/vendor/
-/Godeps/
+# Go workspace file
+go.work
 
-### Intellij+all ###
-# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio and WebStorm
+### GoLand+all ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
 # Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
 
 # User-specific stuff
@@ -33,6 +35,9 @@
 .idea/**/dictionaries
 .idea/**/shelf
 
+# AWS User-specific
+.idea/**/aws.xml
+
 # Generated files
 .idea/**/contentModel.xml
 
@@ -53,6 +58,9 @@
 # When using Gradle or Maven with auto-import, you should exclude module files,
 # since they will be recreated, and may cause churn.  Uncomment if using
 # auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
 # .idea/modules.xml
 # .idea/*.iml
 # .idea/modules
@@ -80,6 +88,9 @@ atlassian-ide-plugin.xml
 # Cursive Clojure plugin
 .idea/replstate.xml
 
+# SonarLint plugin
+.idea/sonarlint/
+
 # Crashlytics plugin (for Android Studio and IntelliJ)
 com_crashlytics_export_strings.xml
 crashlytics.properties
@@ -92,21 +103,69 @@ fabric.properties
 # Android studio 3.1+ serialized cache file
 .idea/caches/build_file_checksums.ser
 
+### GoLand+all Patch ###
+# Ignore everything but code style settings and run configurations
+# that are supposed to be shared within teams.
+
+.idea/*
+
+!.idea/codeStyles
+!.idea/runConfigurations
+
+### Intellij+all ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+
+# AWS User-specific
+
+# Generated files
+
+# Sensitive or high-churn files
+
+# Gradle
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+
+# Mongo Explorer plugin
+
+# File-based project format
+
+# IntelliJ
+
+# mpeltonen/sbt-idea plugin
+
+# JIRA plugin
+
+# Cursive Clojure plugin
+
+# SonarLint plugin
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+
+# Editor-based Rest Client
+
+# Android studio 3.1+ serialized cache file
+
 ### Intellij+all Patch ###
-# Ignores the whole .idea folder and all .iml files
-# See https://github.com/joeblau/gitignore.io/issues/186 and https://github.com/joeblau/gitignore.io/issues/360
+# Ignore everything but code style settings and run configurations
+# that are supposed to be shared within teams.
 
-.idea/
 
-# Reason: https://github.com/joeblau/gitignore.io/issues/186#issuecomment-249601023
-
-*.iml
-modules.xml
-.idea/misc.xml
-*.ipr
-
-# Sonarlint plugin
-.idea/sonarlint
 
 ### Linux ###
 *~
@@ -132,6 +191,7 @@ modules.xml
 # Icon must end with two \r
 Icon
 
+
 # Thumbnails
 ._*
 
@@ -151,6 +211,236 @@ Network Trash Folder
 Temporary Items
 .apdisk
 
+### macOS Patch ###
+# iCloud generated files
+*.icloud
+
+### PyCharm+all ###
+# Covers JetBrains IDEs: IntelliJ, RubyMine, PhpStorm, AppCode, PyCharm, CLion, Android Studio, WebStorm and Rider
+# Reference: https://intellij-support.jetbrains.com/hc/en-us/articles/206544839
+
+# User-specific stuff
+
+# AWS User-specific
+
+# Generated files
+
+# Sensitive or high-churn files
+
+# Gradle
+
+# Gradle and Maven with auto-import
+# When using Gradle or Maven with auto-import, you should exclude module files,
+# since they will be recreated, and may cause churn.  Uncomment if using
+# auto-import.
+# .idea/artifacts
+# .idea/compiler.xml
+# .idea/jarRepositories.xml
+# .idea/modules.xml
+# .idea/*.iml
+# .idea/modules
+# *.iml
+# *.ipr
+
+# CMake
+
+# Mongo Explorer plugin
+
+# File-based project format
+
+# IntelliJ
+
+# mpeltonen/sbt-idea plugin
+
+# JIRA plugin
+
+# Cursive Clojure plugin
+
+# SonarLint plugin
+
+# Crashlytics plugin (for Android Studio and IntelliJ)
+
+# Editor-based Rest Client
+
+# Android studio 3.1+ serialized cache file
+
+### PyCharm+all Patch ###
+# Ignore everything but code style settings and run configurations
+# that are supposed to be shared within teams.
+
+
+
+### Python ###
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+cover/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+.pybuilder/
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+#   For a library or package, you might want to ignore these files since the code is
+#   intended to run in multiple environments; otherwise, check them in:
+# .python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# poetry
+#   Similar to Pipfile.lock, it is generally recommended to include poetry.lock in version control.
+#   This is especially recommended for binary packages to ensure reproducibility, and is more
+#   commonly ignored for libraries.
+#   https://python-poetry.org/docs/basic-usage/#commit-your-poetrylock-file-to-version-control
+#poetry.lock
+
+# pdm
+#   Similar to Pipfile.lock, it is generally recommended to include pdm.lock in version control.
+#pdm.lock
+#   pdm stores project-wide configurations in .pdm.toml, but it is recommended to not include it
+#   in version control.
+#   https://pdm.fming.dev/#use-with-ide
+.pdm.toml
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow and github.com/pdm-project/pdm
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# pytype static type analyzer
+.pytype/
+
+# Cython debug symbols
+cython_debug/
+
+# PyCharm
+#  JetBrains specific template is maintained in a separate JetBrains.gitignore that can
+#  be found at https://github.com/github/gitignore/blob/main/Global/JetBrains.gitignore
+#  and can be added to the global gitignore or merged into this file.  For a more nuclear
+#  option (not recommended) you can uncomment the following to ignore the entire idea folder.
+#.idea/
+
+### Python Patch ###
+# Poetry local configuration file - https://python-poetry.org/docs/configuration/#local-configuration
+poetry.toml
+
+# ruff
+.ruff_cache/
+
+# LSP config files
+pyrightconfig.json
+
 ### Windows ###
 # Windows thumbnail cache files
 Thumbs.db
@@ -177,6 +467,4 @@ $RECYCLE.BIN/
 # Windows shortcuts
 *.lnk
 
-# End of https://www.gitignore.io/api/go,linux,macos,windows,intellij+all
-
-cmd/relay/*.json
+# End of https://www.toptal.com/developers/gitignore/api/goland+all,intellij+all,go,windows,linux,macos,python,pycharm+all

CHANGELOG.md

@@ -0,0 +1,3 @@
+# Changelog
+
+https://v2.hysteria.network/docs/Changelog/

Dockerfile

@@ -0,0 +1,39 @@
+FROM golang:1-alpine AS builder
+
+# GOPROXY is disabled by default, use:
+# docker build --build-arg GOPROXY="https://goproxy.io" ...
+# to enable GOPROXY.
+ARG GOPROXY=""
+
+ENV GOPROXY ${GOPROXY}
+
+COPY . /go/src/github.com/apernet/hysteria
+
+WORKDIR /go/src/github.com/apernet/hysteria
+
+RUN set -ex \
+    && apk add git build-base bash python3 \
+    && python hyperbole.py build -r \
+    && mv ./build/hysteria-* /go/bin/hysteria
+
+# multi-stage builds to create the final image
+FROM alpine AS dist
+
+# set up nsswitch.conf for Go's "netgo" implementation
+# - https://github.com/golang/go/blob/go1.9.1/src/net/conf.go#L194-L275
+# - docker run --rm debian:stretch grep '^hosts:' /etc/nsswitch.conf
+RUN if [ ! -e /etc/nsswitch.conf ]; then echo 'hosts: files dns' > /etc/nsswitch.conf; fi
+
+# bash is used for debugging, tzdata is used to add timezone information.
+# Install ca-certificates to ensure no CA certificate errors.
+#
+# Do not try to add the "--no-cache" option when there are multiple "apk"
+# commands, this will cause the build process to become very slow.
+RUN set -ex \
+    && apk upgrade \
+    && apk add bash tzdata ca-certificates \
+    && rm -rf /var/cache/apk/*
+
+COPY --from=builder /go/bin/hysteria /usr/local/bin/hysteria
+
+ENTRYPOINT ["hysteria"]

LICENSE.md

@@ -1,21 +1,7 @@
-The MIT License (MIT)
+Copyright 2023 Toby
 
-Copyright (c) 2020 Toby
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
-
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

PROTOCOL.md

@@ -0,0 +1,153 @@
+# Hysteria 2 Protocol Specification
+
+Hysteria is a TCP & UDP proxy based on QUIC, designed for speed, security and censorship resistance. This document describes the protocol used by Hysteria starting with version 2.0.0, sometimes internally referred to as the "v4" protocol. From here on, we will call it "the protocol" or "the Hysteria protocol".
+
+## Requirements Language
+
+The keywords "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in [RFC 2119](https://tools.ietf.org/html/rfc2119).
+
+## Underlying Protocol & Wire Format
+
+The Hysteria protocol MUST be implemented on top of the standard QUIC transport protocol [RFC 9000](https://datatracker.ietf.org/doc/html/rfc9000) with [Unreliable Datagram Extension](https://datatracker.ietf.org/doc/rfc9221/).
+
+All multibyte numbers use Big Endian format.
+
+All variable-length integers ("varints") are encoded/decoded as defined in QUIC (RFC 9000).
+
+## Authentication & HTTP/3 masquerading
+
+One of the key features of the Hysteria protocol is that to a third party without proper authentication credentials (whether it's a middleman or an active prober), a Hysteria proxy server behaves just like a standard HTTP/3 web server. Additionally, the encrypted traffic between the client and the server appears indistinguishable from normal HTTP/3 traffic.
+
+Therefore, a Hysteria server MUST implement an HTTP/3 server (as defined by [RFC 9114](https://datatracker.ietf.org/doc/rfc9114/)) and handle HTTP requests as any standard web server would. To prevent active probers from detecting common response patterns in Hysteria servers, implementations SHOULD advise users to either host actual content or set it up as a reverse proxy for other sites.
+
+An actual Hysteria client, upon connection, MUST send the following HTTP/3 request to the server:
+
+```
+:method: POST
+:path: /auth
+:host: hysteria
+Hysteria-Auth: [string]
+Hysteria-CC-RX: [uint]
+Hysteria-Padding: [string]
+```
+
+`Hysteria-Auth`: Authentication credentials.
+
+`Hysteria-CC-RX`: Client's maximum receive rate in bytes per second. A value of 0 indicates unknown.
+
+`Hysteria-Padding`: A random padding string of variable length.
+
+The Hysteria server MUST identify this special request, and, instead of attempting to serve content or forwarding it to an upstream site, it MUST authenticate the client using the provided information. If authentication is successful, the server MUST send the following response (HTTP status code 233):
+
+```
+:status: 233 HyOK
+Hysteria-UDP: [true/false]
+Hysteria-CC-RX: [uint/"auto"]
+Hysteria-Padding: [string]
+```
+
+`Hysteria-UDP`: Whether the server supports UDP relay.
+
+`Hysteria-CC-RX`: Server's maximum receive rate in bytes per second. A value of 0 indicates unlimited; "auto" indicates the server refuses to provide a value and ask the client to use congestion control to determine the rate on its own.
+
+`Hysteria-Padding`: A random padding string of variable length.
+
+See the Congestion Control section for more information on how to use the `Hysteria-CC-RX` values.
+
+`Hysteria-Padding` is optional and is only intended to obfuscate the request/response pattern. It SHOULD be ignored by both sides.
+
+If authentication fails, the server MUST either act like a standard web server that does not understand the request, or in the case of being a reverse proxy, forward the request to the upstream site and return the response to the client.
+
+The client MUST check the status code to determine if the authentication was successful. If the status code is anything other than 233, the client MUST consider authentication to have failed and disconnect from the server.
+
+After (and only after) a client passes authentication, the server MUST consider this QUIC connection to be a Hysteria proxy connection. It MUST then start processing proxy requests from the client as described in the next section.
+
+## Proxy Requests
+
+### TCP
+
+For each TCP connection, the client MUST create a new QUIC bidirectional stream and send the following TCPRequest message:
+
+```
+[varint] 0x401 (TCPRequest ID)
+[varint] Address length
+[bytes] Address string (host:port)
+[varint] Padding length
+[bytes] Random padding
+```
+
+The server MUST respond with a TCPResponse message:
+
+```
+[uint8] Status (0x00 = OK, 0x01 = Error)
+[varint] Message length
+[bytes] Message string
+[varint] Padding length
+[bytes] Random padding
+```
+
+If the status is OK, the server MUST then begin forwarding data between the client and the specified TCP address until either side closes the connection. If the status is Error, the server MUST close the QUIC stream.
+
+### UDP
+
+UDP packets MUST be encapsulated in the following UDPMessage format and sent over QUIC's unreliable datagram (for both client-to-server and server-to-client):
+
+```
+[uint32] Session ID
+[uint16] Packet ID
+[uint8] Fragment ID
+[uint8] Fragment count
+[varint] Address length
+[bytes] Address string (host:port)
+[bytes] Payload
+```
+
+The client MUST use a unique Session ID for each UDP session. The server SHOULD assign a unique UDP port to each Session ID, unless it has another mechanism to differentiate packets from different sessions (e.g., symmetric NAT, varying outbound IP addresses, etc.).
+
+The protocol does not provide an explicit way to close a UDP session. While a client can retain and reuse a Session ID indefinitely, the server SHOULD release and reassign the port associated with the Session ID after a period of inactivity or some other criteria. If the client sends a UDP packet to a Session ID that is no longer recognized by the server, the server MUST treat it as a new session and assign a new port.
+
+If a server does not support UDP relay, it SHOULD silently discard all UDP messages received from the client.
+
+#### Fragmentation
+
+Due to the limit imposed by QUIC's unreliable datagram channel, any UDP packet that exceeds QUIC's maximum datagram size MUST either be fragmented or discarded.
+
+For fragmented packets, each fragment MUST carry the same unique Packet ID. The Fragment ID, starting from 0, indicates the index out of the total Fragment Count. Both the server and client MUST wait for all fragments of a fragmented packet to arrive before processing them. If one or more fragments of a packet are lost, the entire packet MUST be discarded.
+
+For packets that are not fragmented, the Fragment Count MUST be set to 1. In this case, the values of Packet ID and Fragment ID are irrelevant.
+
+## Congestion Control
+
+A unique feature of Hysteria is the ability to set the tx/rx (upload/download) rate on the client side. During authentication, the client sends its rx rate to the server via the `Hysteria-CC-RX` header. The server can use this to determine its transmission rate to the client, and vice versa by returning its rx rate to the client through the same header.
+
+Three special cases are:
+
+- If the client sends 0, it doesn't know its own rx rate. The server MUST use a congestion control algorithm (e.g., BBR, Cubic) to adjust its transmission rate.
+- If the server responds with 0, it has no bandwidth limit. The client MAY transmit at any rate it wants.
+- If the server responds with "auto", it chooses not to specify a rate. The client MUST use a congestion control algorithm to adjust its transmission rate.
+
+## "Salamander" Obfuscation
+
+The Hysteria protocol supports an optional obfuscation layer codenamed "Salamander".
+
+"Salamander" encapsulates all QUIC packets in the following format:
+
+```
+[8 bytes] Salt
+[bytes] Payload
+```
+
+For each QUIC packet, the obfuscator MUST calculate the BLAKE2b-256 hash of a randomly generated 8-byte salt appended to a user-provided pre-shared key.
+
+```
+hash = BLAKE2b-256(key + salt)
+```
+
+The hash is then used to obfuscate the payload using the following algorithm:
+
+```
+for i in range(0, len(payload)):
+    payload[i] ^= hash[i % 32]
+```
+
+The deobfuscator MUST use the same algorithms to calculate the salted hash and deobfuscate the payload. Any invalid packet MUST be discarded.

README.md

@@ -1,8 +1,60 @@
-![Logo](docs/logos/readme.png)
+# ![Hysteria 2](logo.svg)
 
-[![License][1]][2] [![Telegram][3]][4]
+[![License][1]][2] [![Release][3]][4] [![Telegram][5]][6] [![Discussions][7]][8]
 
-[1]: https://img.shields.io/github/license/tobyxdd/hysteria?style=flat-square&
+[1]: https://img.shields.io/badge/license-MIT-blue
 [2]: LICENSE.md
-[3]: https://patrolavia.github.io/telegram-badge/chat.png
-[4]: https://t.me/hysteria_github
+[3]: https://img.shields.io/github/v/release/apernet/hysteria?style=flat-square
+[4]: https://github.com/apernet/hysteria/releases
+[5]: https://img.shields.io/badge/chat-Telegram-blue?style=flat-square
+[6]: https://t.me/hysteria_github
+[7]: https://img.shields.io/github/discussions/apernet/hysteria?style=flat-square
+[8]: https://github.com/apernet/hysteria/discussions
+
+<h2 style="text-align: center;">Hysteria is a powerful, lightning fast and censorship resistant proxy.</h2>
+
+### [Get Started](https://v2.hysteria.network/)
+
+### [中文文档](https://v2.hysteria.network/zh/)
+
+### [Hysteria 1.x (legacy)](https://v1.hysteria.network/)
+
+---
+
+<div class="feature-grid">
+  <div>
+    <h3>🛠️ Jack of all trades</h3>
+    <p>Wide range of modes including SOCKS5, HTTP Proxy, TCP/UDP Forwarding, Linux TProxy, TUN - with more features being added constantly.</p>
+  </div>
+
+  <div>
+    <h3>⚡ Blazing fast</h3>
+    <p>Powered by a customized QUIC protocol, Hysteria is designed to deliver unparalleled performance over unreliable and lossy networks.</p>
+  </div>
+
+  <div>
+    <h3>✊ Censorship resistant</h3>
+    <p>The protocol masquerades as standard HTTP/3 traffic, making it very difficult for censors to detect and block without widespread collateral damage.</p>
+  </div>
+  
+  <div>
+    <h3>💻 Cross-platform</h3>
+    <p>We have builds for every major platform and architecture. Deploy anywhere & use everywhere. Not to mention the long list of 3rd party apps.</p>
+  </div>
+
+  <div>
+    <h3>🔗 Easy integration</h3>
+    <p>With built-in support for custom authentication, traffic statistics & access control, Hysteria is easy to integrate into your infrastructure.</p>
+  </div>
+  
+  <div>
+    <h3>🤗 Chill and supportive</h3>
+    <p>We have well-documented specifications and code for developers to contribute and/or build their own apps. And a helpful community, too.</p>
+  </div>
+</div>
+
+---
+
+**If you find Hysteria useful, consider giving it a ⭐️!**
+
+[![Star History Chart](https://api.star-history.com/svg?repos=apernet/hysteria&type=Date)](https://star-history.com/#apernet/hysteria&Date)

app/LICENSE.md

@@ -0,0 +1,7 @@
+Copyright 2023 Toby
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

app/cmd/client_test.go

@@ -0,0 +1,204 @@
+package cmd
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/spf13/viper"
+)
+
+// TestClientConfig tests the parsing of the client config
+func TestClientConfig(t *testing.T) {
+	viper.SetConfigFile("client_test.yaml")
+	err := viper.ReadInConfig()
+	assert.NoError(t, err)
+	var config clientConfig
+	err = viper.Unmarshal(&config)
+	assert.NoError(t, err)
+	assert.Equal(t, config, clientConfig{
+		Server: "example.com",
+		Auth:   "weak_ahh_password",
+		Transport: clientConfigTransport{
+			Type: "udp",
+			UDP: clientConfigTransportUDP{
+				HopInterval: 30 * time.Second,
+			},
+		},
+		Obfs: clientConfigObfs{
+			Type: "salamander",
+			Salamander: clientConfigObfsSalamander{
+				Password: "cry_me_a_r1ver",
+			},
+		},
+		TLS: clientConfigTLS{
+			SNI:       "another.example.com",
+			Insecure:  true,
+			PinSHA256: "114515DEADBEEF",
+			CA:        "custom_ca.crt",
+		},
+		QUIC: clientConfigQUIC{
+			InitStreamReceiveWindow:     1145141,
+			MaxStreamReceiveWindow:      1145142,
+			InitConnectionReceiveWindow: 1145143,
+			MaxConnectionReceiveWindow:  1145144,
+			MaxIdleTimeout:              10 * time.Second,
+			KeepAlivePeriod:             4 * time.Second,
+			DisablePathMTUDiscovery:     true,
+			Sockopts: clientConfigQUICSockopts{
+				BindInterface:       stringRef("eth0"),
+				FirewallMark:        uint32Ref(1234),
+				FdControlUnixSocket: stringRef("test.sock"),
+			},
+		},
+		Bandwidth: clientConfigBandwidth{
+			Up:   "200 mbps",
+			Down: "1 gbps",
+		},
+		FastOpen: true,
+		Lazy:     true,
+		SOCKS5: &socks5Config{
+			Listen:     "127.0.0.1:1080",
+			Username:   "anon",
+			Password:   "bro",
+			DisableUDP: true,
+		},
+		HTTP: &httpConfig{
+			Listen:   "127.0.0.1:8080",
+			Username: "qqq",
+			Password: "bruh",
+			Realm:    "martian",
+		},
+		TCPForwarding: []tcpForwardingEntry{
+			{
+				Listen: "127.0.0.1:8088",
+				Remote: "internal.example.com:80",
+			},
+		},
+		UDPForwarding: []udpForwardingEntry{
+			{
+				Listen:  "127.0.0.1:5353",
+				Remote:  "internal.example.com:53",
+				Timeout: 50 * time.Second,
+			},
+		},
+		TCPTProxy: &tcpTProxyConfig{
+			Listen: "127.0.0.1:2500",
+		},
+		UDPTProxy: &udpTProxyConfig{
+			Listen:  "127.0.0.1:2501",
+			Timeout: 20 * time.Second,
+		},
+		TCPRedirect: &tcpRedirectConfig{
+			Listen: "127.0.0.1:3500",
+		},
+		TUN: &tunConfig{
+			Name:    "hytun",
+			MTU:     1500,
+			Timeout: 60 * time.Second,
+			Address: struct {
+				IPv4 string `mapstructure:"ipv4"`
+				IPv6 string `mapstructure:"ipv6"`
+			}{IPv4: "100.100.100.101/30", IPv6: "2001::ffff:ffff:ffff:fff1/126"},
+			Route: &struct {
+				Strict      bool     `mapstructure:"strict"`
+				IPv4        []string `mapstructure:"ipv4"`
+				IPv6        []string `mapstructure:"ipv6"`
+				IPv4Exclude []string `mapstructure:"ipv4Exclude"`
+				IPv6Exclude []string `mapstructure:"ipv6Exclude"`
+			}{
+				Strict:      true,
+				IPv4:        []string{"0.0.0.0/0"},
+				IPv6:        []string{"2000::/3"},
+				IPv4Exclude: []string{"192.0.2.1/32"},
+				IPv6Exclude: []string{"2001:db8::1/128"},
+			},
+		},
+	})
+}
+
+// TestClientConfigURI tests URI-related functions of clientConfig
+func TestClientConfigURI(t *testing.T) {
+	tests := []struct {
+		uri    string
+		uriOK  bool
+		config *clientConfig
+	}{
+		{
+			uri:   "hysteria2://god@zilla.jp/",
+			uriOK: true,
+			config: &clientConfig{
+				Server: "zilla.jp",
+				Auth:   "god",
+			},
+		},
+		{
+			uri:   "hysteria2://john:wick@continental.org:4443/",
+			uriOK: true,
+			config: &clientConfig{
+				Server: "continental.org:4443",
+				Auth:   "john:wick",
+			},
+		},
+		{
+			uri:   "hysteria2://saul@better.call:7000-10000,20000/",
+			uriOK: true,
+			config: &clientConfig{
+				Server: "better.call:7000-10000,20000",
+				Auth:   "saul",
+			},
+		},
+		{
+			uri:   "hysteria2://noauth.com/?insecure=1&obfs=salamander&obfs-password=66ccff&pinSHA256=deadbeef&sni=crap.cc",
+			uriOK: true,
+			config: &clientConfig{
+				Server: "noauth.com",
+				Auth:   "",
+				Obfs: clientConfigObfs{
+					Type: "salamander",
+					Salamander: clientConfigObfsSalamander{
+						Password: "66ccff",
+					},
+				},
+				TLS: clientConfigTLS{
+					SNI:       "crap.cc",
+					Insecure:  true,
+					PinSHA256: "deadbeef",
+				},
+			},
+		},
+		{
+			uri:    "invalid.bs",
+			uriOK:  false,
+			config: nil,
+		},
+		{
+			uri:    "https://www.google.com/search?q=test",
+			uriOK:  false,
+			config: nil,
+		},
+	}
+	for _, test := range tests {
+		t.Run(test.uri, func(t *testing.T) {
+			// Test parseURI
+			nc := &clientConfig{Server: test.uri}
+			assert.Equal(t, nc.parseURI(), test.uriOK)
+			if test.uriOK {
+				assert.Equal(t, nc, test.config)
+			}
+			// Test URI generation
+			if test.config != nil {
+				assert.Equal(t, test.config.URI(), test.uri)
+			}
+		})
+	}
+}
+
+func stringRef(s string) *string {
+	return &s
+}
+
+func uint32Ref(i uint32) *uint32 {
+	return &i
+}

app/cmd/client_test.yaml

@@ -0,0 +1,85 @@
+server: example.com
+
+auth: weak_ahh_password
+
+transport:
+  type: udp
+  udp:
+    hopInterval: 30s
+
+obfs:
+  type: salamander
+  salamander:
+    password: cry_me_a_r1ver
+
+tls:
+  sni: another.example.com
+  insecure: true
+  pinSHA256: 114515DEADBEEF
+  ca: custom_ca.crt
+
+quic:
+  initStreamReceiveWindow: 1145141
+  maxStreamReceiveWindow: 1145142
+  initConnReceiveWindow: 1145143
+  maxConnReceiveWindow: 1145144
+  maxIdleTimeout: 10s
+  keepAlivePeriod: 4s
+  disablePathMTUDiscovery: true
+  sockopts:
+    bindInterface: eth0
+    fwmark: 1234
+    fdControlUnixSocket: test.sock
+
+bandwidth:
+  up: 200 mbps
+  down: 1 gbps
+
+fastOpen: true
+
+lazy: true
+
+socks5:
+  listen: 127.0.0.1:1080
+  username: anon
+  password: bro
+  disableUDP: true
+
+http:
+  listen: 127.0.0.1:8080
+  username: qqq
+  password: bruh
+  realm: martian
+
+tcpForwarding:
+  - listen: 127.0.0.1:8088
+    remote: internal.example.com:80
+
+udpForwarding:
+  - listen: 127.0.0.1:5353
+    remote: internal.example.com:53
+    timeout: 50s
+
+tcpTProxy:
+  listen: 127.0.0.1:2500
+
+udpTProxy:
+  listen: 127.0.0.1:2501
+  timeout: 20s
+
+tcpRedirect:
+  listen: 127.0.0.1:3500
+
+tun:
+  name: "hytun"
+  mtu: 1500
+  timeout: 1m
+  address:
+    ipv4: 100.100.100.101/30
+    ipv6: 2001::ffff:ffff:ffff:fff1/126
+  route:
+    strict: true
+    ipv4: [ 0.0.0.0/0 ]
+    ipv6: [ "2000::/3" ]
+    ipv4Exclude: [ 192.0.2.1/32 ]
+    ipv6Exclude: [ "2001:db8::1/128" ]

app/cmd/errors.go

@@ -0,0 +1,18 @@
+package cmd
+
+import (
+	"fmt"
+)
+
+type configError struct {
+	Field string
+	Err   error
+}
+
+func (e configError) Error() string {
+	return fmt.Sprintf("invalid config: %s: %s", e.Field, e.Err)
+}
+
+func (e configError) Unwrap() error {
+	return e.Err
+}

app/cmd/ping.go

@@ -0,0 +1,63 @@
+package cmd
+
+import (
+	"time"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"go.uber.org/zap"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+// pingCmd represents the ping command
+var pingCmd = &cobra.Command{
+	Use:   "ping address",
+	Short: "Ping mode",
+	Long:  "Perform a TCP ping to a specified remote address through the proxy server. Can be used as a simple connectivity test.",
+	Run:   runPing,
+}
+
+func init() {
+	rootCmd.AddCommand(pingCmd)
+}
+
+func runPing(cmd *cobra.Command, args []string) {
+	logger.Info("ping mode")
+
+	if len(args) != 1 {
+		logger.Fatal("must specify one and only one address")
+	}
+	addr := args[0]
+
+	if err := viper.ReadInConfig(); err != nil {
+		logger.Fatal("failed to read client config", zap.Error(err))
+	}
+	var config clientConfig
+	if err := viper.Unmarshal(&config); err != nil {
+		logger.Fatal("failed to parse client config", zap.Error(err))
+	}
+	hyConfig, err := config.Config()
+	if err != nil {
+		logger.Fatal("failed to load client config", zap.Error(err))
+	}
+
+	c, info, err := client.NewClient(hyConfig)
+	if err != nil {
+		logger.Fatal("failed to initialize client", zap.Error(err))
+	}
+	defer c.Close()
+	logger.Info("connected to server",
+		zap.Bool("udpEnabled", info.UDPEnabled),
+		zap.Uint64("tx", info.Tx))
+
+	logger.Info("connecting", zap.String("addr", addr))
+	start := time.Now()
+	conn, err := c.TCP(addr)
+	if err != nil {
+		logger.Fatal("failed to connect", zap.Error(err), zap.String("time", time.Since(start).String()))
+	}
+	defer conn.Close()
+
+	logger.Info("connected", zap.String("time", time.Since(start).String()))
+}

app/cmd/root.go

@@ -0,0 +1,176 @@
+package cmd
+
+import (
+	"fmt"
+	"os"
+	"strconv"
+	"strings"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"go.uber.org/zap"
+	"go.uber.org/zap/zapcore"
+)
+
+const (
+	appLogo = `
+░█░█░█░█░█▀▀░▀█▀░█▀▀░█▀▄░▀█▀░█▀█░░░▀▀▄
+░█▀█░░█░░▀▀█░░█░░█▀▀░█▀▄░░█░░█▀█░░░▄▀░
+░▀░▀░░▀░░▀▀▀░░▀░░▀▀▀░▀░▀░▀▀▀░▀░▀░░░▀▀▀
+`
+	appDesc    = "a powerful, lightning fast and censorship resistant proxy"
+	appAuthors = "Aperture Internet Laboratory <https://github.com/apernet>"
+
+	appLogLevelEnv           = "HYSTERIA_LOG_LEVEL"
+	appLogFormatEnv          = "HYSTERIA_LOG_FORMAT"
+	appDisableUpdateCheckEnv = "HYSTERIA_DISABLE_UPDATE_CHECK"
+	appACMEDirEnv            = "HYSTERIA_ACME_DIR"
+)
+
+var (
+	// These values will be injected by the build system
+	appVersion   = "Unknown"
+	appDate      = "Unknown"
+	appType      = "Unknown" // aka channel
+	appToolchain = "Unknown"
+	appCommit    = "Unknown"
+	appPlatform  = "Unknown"
+	appArch      = "Unknown"
+	libVersion   = "Unknown"
+
+	appVersionLong = fmt.Sprintf("Version:\t%s\n"+
+		"BuildDate:\t%s\n"+
+		"BuildType:\t%s\n"+
+		"Toolchain:\t%s\n"+
+		"CommitHash:\t%s\n"+
+		"Platform:\t%s\n"+
+		"Architecture:\t%s\n"+
+		"Libraries:\tquic-go=%s",
+		appVersion, appDate, appType, appToolchain, appCommit, appPlatform, appArch, libVersion)
+
+	appAboutLong = fmt.Sprintf("%s\n%s\n%s\n\n%s", appLogo, appDesc, appAuthors, appVersionLong)
+)
+
+var logger *zap.Logger
+
+// Flags
+var (
+	cfgFile            string
+	logLevel           string
+	logFormat          string
+	disableUpdateCheck bool
+)
+
+var rootCmd = &cobra.Command{
+	Use:   "hysteria",
+	Short: appDesc,
+	Long:  appAboutLong,
+	Run:   runClient, // Default to client mode
+}
+
+var logLevelMap = map[string]zapcore.Level{
+	"debug": zapcore.DebugLevel,
+	"info":  zapcore.InfoLevel,
+	"warn":  zapcore.WarnLevel,
+	"error": zapcore.ErrorLevel,
+}
+
+var logFormatMap = map[string]zapcore.EncoderConfig{
+	"console": {
+		TimeKey:        "time",
+		LevelKey:       "level",
+		NameKey:        "logger",
+		MessageKey:     "msg",
+		LineEnding:     zapcore.DefaultLineEnding,
+		EncodeLevel:    zapcore.CapitalColorLevelEncoder,
+		EncodeTime:     zapcore.RFC3339TimeEncoder,
+		EncodeDuration: zapcore.SecondsDurationEncoder,
+	},
+	"json": {
+		TimeKey:        "time",
+		LevelKey:       "level",
+		NameKey:        "logger",
+		MessageKey:     "msg",
+		LineEnding:     zapcore.DefaultLineEnding,
+		EncodeLevel:    zapcore.LowercaseLevelEncoder,
+		EncodeTime:     zapcore.EpochMillisTimeEncoder,
+		EncodeDuration: zapcore.SecondsDurationEncoder,
+	},
+}
+
+func Execute() {
+	err := rootCmd.Execute()
+	if err != nil {
+		os.Exit(1)
+	}
+}
+
+func init() {
+	initFlags()
+	cobra.MousetrapHelpText = "" // Disable the mousetrap so Windows users can run the exe directly by double-clicking
+	cobra.OnInitialize(initConfig)
+	cobra.OnInitialize(initLogger) // initLogger must come after initConfig as it depends on config
+}
+
+func initFlags() {
+	rootCmd.PersistentFlags().StringVarP(&cfgFile, "config", "c", "", "config file")
+	rootCmd.PersistentFlags().StringVarP(&logLevel, "log-level", "l", envOrDefaultString(appLogLevelEnv, "info"), "log level")
+	rootCmd.PersistentFlags().StringVarP(&logFormat, "log-format", "f", envOrDefaultString(appLogFormatEnv, "console"), "log format")
+	rootCmd.PersistentFlags().BoolVar(&disableUpdateCheck, "disable-update-check", envOrDefaultBool(appDisableUpdateCheckEnv, false), "disable update check")
+}
+
+func initConfig() {
+	if cfgFile != "" {
+		viper.SetConfigFile(cfgFile)
+	} else {
+		viper.SetConfigName("config")
+		viper.SetConfigType("yaml")
+		viper.SupportedExts = append([]string{"yaml", "yml"}, viper.SupportedExts...)
+		viper.AddConfigPath(".")
+		viper.AddConfigPath("$HOME/.hysteria")
+		viper.AddConfigPath("/etc/hysteria/")
+	}
+}
+
+func initLogger() {
+	level, ok := logLevelMap[strings.ToLower(logLevel)]
+	if !ok {
+		fmt.Printf("unsupported log level: %s\n", logLevel)
+		os.Exit(1)
+	}
+	enc, ok := logFormatMap[strings.ToLower(logFormat)]
+	if !ok {
+		fmt.Printf("unsupported log format: %s\n", logFormat)
+		os.Exit(1)
+	}
+	c := zap.Config{
+		Level:             zap.NewAtomicLevelAt(level),
+		DisableCaller:     true,
+		DisableStacktrace: true,
+		Encoding:          strings.ToLower(logFormat),
+		EncoderConfig:     enc,
+		OutputPaths:       []string{"stderr"},
+		ErrorOutputPaths:  []string{"stderr"},
+	}
+	var err error
+	logger, err = c.Build()
+	if err != nil {
+		fmt.Printf("failed to initialize logger: %s\n", err)
+		os.Exit(1)
+	}
+}
+
+func envOrDefaultString(key, def string) string {
+	if v := os.Getenv(key); v != "" {
+		return v
+	}
+	return def
+}
+
+func envOrDefaultBool(key string, def bool) bool {
+	if v := os.Getenv(key); v != "" {
+		b, _ := strconv.ParseBool(v)
+		return b
+	}
+	return def
+}

app/cmd/server_test.go

@@ -0,0 +1,189 @@
+package cmd
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/spf13/viper"
+)
+
+// TestServerConfig tests the parsing of the server config
+func TestServerConfig(t *testing.T) {
+	viper.SetConfigFile("server_test.yaml")
+	err := viper.ReadInConfig()
+	assert.NoError(t, err)
+	var config serverConfig
+	err = viper.Unmarshal(&config)
+	assert.NoError(t, err)
+	assert.Equal(t, config, serverConfig{
+		Listen: ":8443",
+		Obfs: serverConfigObfs{
+			Type: "salamander",
+			Salamander: serverConfigObfsSalamander{
+				Password: "cry_me_a_r1ver",
+			},
+		},
+		TLS: &serverConfigTLS{
+			Cert:     "some.crt",
+			Key:      "some.key",
+			SNIGuard: "strict",
+		},
+		ACME: &serverConfigACME{
+			Domains: []string{
+				"sub1.example.com",
+				"sub2.example.com",
+			},
+			Email:      "haha@cringe.net",
+			CA:         "zero",
+			ListenHost: "127.0.0.9",
+			Dir:        "random_dir",
+			Type:       "dns",
+			HTTP: serverConfigACMEHTTP{
+				AltPort: 8888,
+			},
+			TLS: serverConfigACMETLS{
+				AltPort: 44333,
+			},
+			DNS: serverConfigACMEDNS{
+				Name: "gomommy",
+				Config: map[string]string{
+					"key1": "value1",
+					"key2": "value2",
+				},
+			},
+			DisableHTTP:    true,
+			DisableTLSALPN: true,
+			AltHTTPPort:    8080,
+			AltTLSALPNPort: 4433,
+		},
+		QUIC: serverConfigQUIC{
+			InitStreamReceiveWindow:     77881,
+			MaxStreamReceiveWindow:      77882,
+			InitConnectionReceiveWindow: 77883,
+			MaxConnectionReceiveWindow:  77884,
+			MaxIdleTimeout:              999 * time.Second,
+			MaxIncomingStreams:          256,
+			DisablePathMTUDiscovery:     true,
+		},
+		Bandwidth: serverConfigBandwidth{
+			Up:   "500 mbps",
+			Down: "100 mbps",
+		},
+		IgnoreClientBandwidth: true,
+		SpeedTest:             true,
+		DisableUDP:            true,
+		UDPIdleTimeout:        120 * time.Second,
+		Auth: serverConfigAuth{
+			Type:     "password",
+			Password: "goofy_ahh_password",
+			UserPass: map[string]string{
+				"yolo": "swag",
+				"lol":  "kek",
+				"foo":  "bar",
+			},
+			HTTP: serverConfigAuthHTTP{
+				URL:      "http://127.0.0.1:5000/auth",
+				Insecure: true,
+			},
+			Command: "/etc/some_command",
+		},
+		Resolver: serverConfigResolver{
+			Type: "udp",
+			TCP: serverConfigResolverTCP{
+				Addr:    "123.123.123.123:5353",
+				Timeout: 4 * time.Second,
+			},
+			UDP: serverConfigResolverUDP{
+				Addr:    "4.6.8.0:53",
+				Timeout: 2 * time.Second,
+			},
+			TLS: serverConfigResolverTLS{
+				Addr:     "dot.yolo.com:8853",
+				Timeout:  10 * time.Second,
+				SNI:      "server1.yolo.net",
+				Insecure: true,
+			},
+			HTTPS: serverConfigResolverHTTPS{
+				Addr:     "cringe.ahh.cc",
+				Timeout:  5 * time.Second,
+				SNI:      "real.stuff.net",
+				Insecure: true,
+			},
+		},
+		Sniff: serverConfigSniff{
+			Enable:        true,
+			Timeout:       1 * time.Second,
+			RewriteDomain: true,
+			TCPPorts:      "80,443,1000-2000",
+			UDPPorts:      "443",
+		},
+		ACL: serverConfigACL{
+			File: "chnroute.txt",
+			Inline: []string{
+				"lmao(ok)",
+				"kek(cringe,boba,tea)",
+			},
+			GeoIP:             "some.dat",
+			GeoSite:           "some_site.dat",
+			GeoUpdateInterval: 168 * time.Hour,
+		},
+		Outbounds: []serverConfigOutboundEntry{
+			{
+				Name: "goodstuff",
+				Type: "direct",
+				Direct: serverConfigOutboundDirect{
+					Mode:       "64",
+					BindIPv4:   "2.4.6.8",
+					BindIPv6:   "0:0:0:0:0:ffff:0204:0608",
+					BindDevice: "eth233",
+					FastOpen:   true,
+				},
+			},
+			{
+				Name: "badstuff",
+				Type: "socks5",
+				SOCKS5: serverConfigOutboundSOCKS5{
+					Addr:     "shady.proxy.ru:1080",
+					Username: "hackerman",
+					Password: "Elliot Alderson",
+				},
+			},
+			{
+				Name: "weirdstuff",
+				Type: "http",
+				HTTP: serverConfigOutboundHTTP{
+					URL:      "https://eyy.lmao:4443/goofy",
+					Insecure: true,
+				},
+			},
+		},
+		TrafficStats: serverConfigTrafficStats{
+			Listen: ":9999",
+			Secret: "its_me_mario",
+		},
+		Masquerade: serverConfigMasquerade{
+			Type: "proxy",
+			File: serverConfigMasqueradeFile{
+				Dir: "/www/masq",
+			},
+			Proxy: serverConfigMasqueradeProxy{
+				URL:         "https://some.site.net",
+				RewriteHost: true,
+				Insecure:    true,
+			},
+			String: serverConfigMasqueradeString{
+				Content: "aint nothin here",
+				Headers: map[string]string{
+					"content-type": "text/plain",
+					"custom-haha":  "lol",
+				},
+				StatusCode: 418,
+			},
+			ListenHTTP:  ":80",
+			ListenHTTPS: ":443",
+			ForceHTTPS:  true,
+		},
+	})
+}

app/cmd/server_test.yaml

@@ -0,0 +1,144 @@
+listen: :8443
+
+obfs:
+  type: salamander
+  salamander:
+    password: cry_me_a_r1ver
+
+tls:
+  cert: some.crt
+  key: some.key
+  sniGuard: strict
+
+acme:
+  domains:
+    - sub1.example.com
+    - sub2.example.com
+  email: haha@cringe.net
+  ca: zero
+  listenHost: 127.0.0.9
+  dir: random_dir
+  type: dns
+  http:
+    altPort: 8888
+  tls:
+    altPort: 44333
+  dns:
+    name: gomommy
+    config:
+      key1: value1
+      key2: value2
+  disableHTTP: true
+  disableTLSALPN: true
+  altHTTPPort: 8080
+  altTLSALPNPort: 4433
+
+quic:
+  initStreamReceiveWindow: 77881
+  maxStreamReceiveWindow: 77882
+  initConnReceiveWindow: 77883
+  maxConnReceiveWindow: 77884
+  maxIdleTimeout: 999s
+  maxIncomingStreams: 256
+  disablePathMTUDiscovery: true
+
+bandwidth:
+  up: 500 mbps
+  down: 100 mbps
+
+ignoreClientBandwidth: true
+
+speedTest: true
+
+disableUDP: true
+udpIdleTimeout: 120s
+
+auth:
+  type: password
+  password: goofy_ahh_password
+  userpass:
+    yolo: swag
+    lol: kek
+    foo: bar
+  http:
+    url: http://127.0.0.1:5000/auth
+    insecure: true
+  command: /etc/some_command
+
+resolver:
+  type: udp
+  tcp:
+    addr: 123.123.123.123:5353
+    timeout: 4s
+  udp:
+    addr: 4.6.8.0:53
+    timeout: 2s
+  tls:
+    addr: dot.yolo.com:8853
+    timeout: 10s
+    sni: server1.yolo.net
+    insecure: true
+  https:
+    addr: cringe.ahh.cc
+    timeout: 5s
+    sni: real.stuff.net
+    insecure: true
+
+sniff:
+  enable: true
+  timeout: 1s
+  rewriteDomain: true
+  tcpPorts: 80,443,1000-2000
+  udpPorts: 443
+
+acl:
+  file: chnroute.txt
+  inline:
+    - lmao(ok)
+    - kek(cringe,boba,tea)
+  geoip: some.dat
+  geosite: some_site.dat
+  geoUpdateInterval: 168h
+
+outbounds:
+  - name: goodstuff
+    type: direct
+    direct:
+      mode: 64
+      bindIPv4: 2.4.6.8
+      bindIPv6: 0:0:0:0:0:ffff:0204:0608
+      bindDevice: eth233
+      fastOpen: true
+  - name: badstuff
+    type: socks5
+    socks5:
+      addr: shady.proxy.ru:1080
+      username: hackerman
+      password: Elliot Alderson
+  - name: weirdstuff
+    type: http
+    http:
+      url: https://eyy.lmao:4443/goofy
+      insecure: true
+
+trafficStats:
+  listen: :9999
+  secret: its_me_mario
+
+masquerade:
+  type: proxy
+  file:
+    dir: /www/masq
+  proxy:
+    url: https://some.site.net
+    rewriteHost: true
+    insecure: true
+  string:
+    content: aint nothin here
+    headers:
+      content-type: text/plain
+      custom-haha: lol
+    statusCode: 418
+  listenHTTP: :80
+  listenHTTPS: :443
+  forceHTTPS: true

app/cmd/share.go

@@ -0,0 +1,55 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/apernet/hysteria/app/v2/internal/utils"
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"go.uber.org/zap"
+)
+
+var (
+	noText bool
+	withQR bool
+)
+
+// shareCmd represents the share command
+var shareCmd = &cobra.Command{
+	Use:   "share",
+	Short: "Generate share URI",
+	Long:  "Generate a hysteria2:// URI from a client config for sharing",
+	Run:   runShare,
+}
+
+func init() {
+	initShareFlags()
+	rootCmd.AddCommand(shareCmd)
+}
+
+func initShareFlags() {
+	shareCmd.Flags().BoolVar(&noText, "notext", false, "do not show URI as text")
+	shareCmd.Flags().BoolVar(&withQR, "qr", false, "show URI as QR code")
+}
+
+func runShare(cmd *cobra.Command, args []string) {
+	if err := viper.ReadInConfig(); err != nil {
+		logger.Fatal("failed to read client config", zap.Error(err))
+	}
+	var config clientConfig
+	if err := viper.Unmarshal(&config); err != nil {
+		logger.Fatal("failed to parse client config", zap.Error(err))
+	}
+	if _, err := config.Config(); err != nil {
+		logger.Fatal("failed to load client config", zap.Error(err))
+	}
+
+	u := config.URI()
+
+	if !noText {
+		fmt.Println(u)
+	}
+	if withQR {
+		utils.PrintQR(u)
+	}
+}

app/cmd/speedtest.go

@@ -0,0 +1,178 @@
+package cmd
+
+import (
+	"errors"
+	"fmt"
+	"os"
+	"os/signal"
+	"syscall"
+	"time"
+
+	"github.com/spf13/cobra"
+	"github.com/spf13/viper"
+	"go.uber.org/zap"
+
+	"github.com/apernet/hysteria/core/v2/client"
+	hyErrors "github.com/apernet/hysteria/core/v2/errors"
+	"github.com/apernet/hysteria/extras/v2/outbounds"
+	"github.com/apernet/hysteria/extras/v2/outbounds/speedtest"
+)
+
+var (
+	skipDownload bool
+	skipUpload   bool
+	dataSize     uint32
+	useBytes     bool
+
+	speedtestAddr = fmt.Sprintf("%s:%d", outbounds.SpeedtestDest, 0)
+)
+
+// speedtestCmd represents the speedtest command
+var speedtestCmd = &cobra.Command{
+	Use:   "speedtest",
+	Short: "Speed test mode",
+	Long:  "Perform a speed test through the proxy server. The server must have speed test support enabled.",
+	Run:   runSpeedtest,
+}
+
+func init() {
+	initSpeedtestFlags()
+	rootCmd.AddCommand(speedtestCmd)
+}
+
+func initSpeedtestFlags() {
+	speedtestCmd.Flags().BoolVar(&skipDownload, "skip-download", false, "Skip download test")
+	speedtestCmd.Flags().BoolVar(&skipUpload, "skip-upload", false, "Skip upload test")
+	speedtestCmd.Flags().Uint32Var(&dataSize, "data-size", 1024*1024*100, "Data size for download and upload tests")
+	speedtestCmd.Flags().BoolVar(&useBytes, "use-bytes", false, "Use bytes per second instead of bits per second")
+}
+
+func runSpeedtest(cmd *cobra.Command, args []string) {
+	logger.Info("speed test mode")
+
+	if err := viper.ReadInConfig(); err != nil {
+		logger.Fatal("failed to read client config", zap.Error(err))
+	}
+	var config clientConfig
+	if err := viper.Unmarshal(&config); err != nil {
+		logger.Fatal("failed to parse client config", zap.Error(err))
+	}
+	hyConfig, err := config.Config()
+	if err != nil {
+		logger.Fatal("failed to load client config", zap.Error(err))
+	}
+
+	c, info, err := client.NewClient(hyConfig)
+	if err != nil {
+		logger.Fatal("failed to initialize client", zap.Error(err))
+	}
+	defer c.Close()
+	logger.Info("connected to server",
+		zap.Bool("udpEnabled", info.UDPEnabled),
+		zap.Uint64("tx", info.Tx))
+
+	signalChan := make(chan os.Signal, 1)
+	signal.Notify(signalChan, os.Interrupt, syscall.SIGTERM)
+	defer signal.Stop(signalChan)
+
+	runChan := make(chan struct{}, 1)
+	go func() {
+		if !skipDownload {
+			runDownloadTest(c)
+		}
+		if !skipUpload {
+			runUploadTest(c)
+		}
+		runChan <- struct{}{}
+	}()
+
+	select {
+	case <-signalChan:
+		logger.Info("received signal, shutting down gracefully")
+	case <-runChan:
+		logger.Info("speed test complete")
+	}
+}
+
+func runDownloadTest(c client.Client) {
+	logger.Info("performing download test")
+	downConn, err := c.TCP(speedtestAddr)
+	if err != nil {
+		if errors.As(err, &hyErrors.DialError{}) {
+			logger.Fatal("failed to connect (server may not support speed test)", zap.Error(err))
+		} else {
+			logger.Fatal("failed to connect", zap.Error(err))
+		}
+	}
+	defer downConn.Close()
+
+	downClient := &speedtest.Client{Conn: downConn}
+	currentTotal := uint32(0)
+	err = downClient.Download(dataSize, func(d time.Duration, b uint32, done bool) {
+		if !done {
+			currentTotal += b
+			logger.Info("downloading",
+				zap.Uint32("bytes", b),
+				zap.String("progress", fmt.Sprintf("%.2f%%", float64(currentTotal)/float64(dataSize)*100)),
+				zap.String("speed", formatSpeed(b, d, useBytes)))
+		} else {
+			logger.Info("download complete",
+				zap.Uint32("bytes", b),
+				zap.String("speed", formatSpeed(b, d, useBytes)))
+		}
+	})
+	if err != nil {
+		logger.Fatal("download test failed", zap.Error(err))
+	}
+	logger.Info("download test complete")
+}
+
+func runUploadTest(c client.Client) {
+	logger.Info("performing upload test")
+	upConn, err := c.TCP(speedtestAddr)
+	if err != nil {
+		if errors.As(err, &hyErrors.DialError{}) {
+			logger.Fatal("failed to connect (server may not support speed test)", zap.Error(err))
+		} else {
+			logger.Fatal("failed to connect", zap.Error(err))
+		}
+	}
+	defer upConn.Close()
+
+	upClient := &speedtest.Client{Conn: upConn}
+	currentTotal := uint32(0)
+	err = upClient.Upload(dataSize, func(d time.Duration, b uint32, done bool) {
+		if !done {
+			currentTotal += b
+			logger.Info("uploading",
+				zap.Uint32("bytes", b),
+				zap.String("progress", fmt.Sprintf("%.2f%%", float64(currentTotal)/float64(dataSize)*100)),
+				zap.String("speed", formatSpeed(b, d, useBytes)))
+		} else {
+			logger.Info("upload complete",
+				zap.Uint32("bytes", b),
+				zap.String("speed", formatSpeed(b, d, useBytes)))
+		}
+	})
+	if err != nil {
+		logger.Fatal("upload test failed", zap.Error(err))
+	}
+	logger.Info("upload test complete")
+}
+
+func formatSpeed(bytes uint32, duration time.Duration, useBytes bool) string {
+	speed := float64(bytes) / duration.Seconds()
+	var units []string
+	if useBytes {
+		units = []string{"B/s", "KB/s", "MB/s", "GB/s"}
+	} else {
+		units = []string{"bps", "Kbps", "Mbps", "Gbps"}
+		speed *= 8
+	}
+	unitIndex := 0
+	for speed > 1000 && unitIndex < len(units)-1 {
+		speed /= 1000
+		unitIndex++
+	}
+	return fmt.Sprintf("%.2f %s", speed, units[unitIndex])
+}

app/cmd/update.go

@@ -0,0 +1,88 @@
+package cmd
+
+import (
+	"time"
+
+	"github.com/spf13/cobra"
+	"go.uber.org/zap"
+
+	"github.com/apernet/hysteria/app/v2/internal/utils"
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+const (
+	updateCheckInterval = 24 * time.Hour
+)
+
+// checkUpdateCmd represents the checkUpdate command
+var checkUpdateCmd = &cobra.Command{
+	Use:   "check-update",
+	Short: "Check for updates",
+	Long:  "Check for updates.",
+	Run:   runCheckUpdate,
+}
+
+func init() {
+	rootCmd.AddCommand(checkUpdateCmd)
+}
+
+func runCheckUpdate(cmd *cobra.Command, args []string) {
+	logger.Info("checking for updates",
+		zap.String("version", appVersion),
+		zap.String("platform", appPlatform),
+		zap.String("arch", appArch),
+		zap.String("channel", appType),
+	)
+
+	checker := utils.NewServerUpdateChecker(appVersion, appPlatform, appArch, appType)
+	resp, err := checker.Check()
+	if err != nil {
+		logger.Fatal("failed to check for updates", zap.Error(err))
+	}
+	if resp.HasUpdate {
+		logger.Info("update available",
+			zap.String("version", resp.LatestVersion),
+			zap.String("url", resp.URL),
+			zap.Bool("urgent", resp.Urgent),
+		)
+	} else {
+		logger.Info("no update available")
+	}
+}
+
+// runCheckUpdateServer is the background update checking routine for server mode
+func runCheckUpdateServer() {
+	checker := utils.NewServerUpdateChecker(appVersion, appPlatform, appArch, appType)
+	checkUpdateRoutine(checker)
+}
+
+// runCheckUpdateClient is the background update checking routine for client mode
+func runCheckUpdateClient(hyClient client.Client) {
+	checker := utils.NewClientUpdateChecker(appVersion, appPlatform, appArch, appType, hyClient)
+	checkUpdateRoutine(checker)
+}
+
+func checkUpdateRoutine(checker *utils.UpdateChecker) {
+	ticker := time.NewTicker(updateCheckInterval)
+	for {
+		logger.Debug("checking for updates",
+			zap.String("version", appVersion),
+			zap.String("platform", appPlatform),
+			zap.String("arch", appArch),
+			zap.String("channel", appType),
+		)
+		resp, err := checker.Check()
+		if err != nil {
+			logger.Debug("failed to check for updates", zap.Error(err))
+		} else if resp.HasUpdate {
+			logger.Info("update available",
+				zap.String("version", resp.LatestVersion),
+				zap.String("url", resp.URL),
+				zap.Bool("urgent", resp.Urgent),
+			)
+		} else {
+			logger.Debug("no update available")
+		}
+		<-ticker.C
+	}
+}

app/cmd/version.go

@@ -0,0 +1,23 @@
+package cmd
+
+import (
+	"fmt"
+
+	"github.com/spf13/cobra"
+)
+
+// versionCmd represents the version command
+var versionCmd = &cobra.Command{
+	Use:   "version",
+	Short: "Show version",
+	Long:  "Show version.",
+	Run:   runVersion,
+}
+
+func init() {
+	rootCmd.AddCommand(versionCmd)
+}
+
+func runVersion(cmd *cobra.Command, args []string) {
+	fmt.Println(appAboutLong)
+}

app/go.mod

@@ -0,0 +1,92 @@
+module github.com/apernet/hysteria/app/v2
+
+go 1.22
+
+toolchain go1.23.2
+
+require (
+	github.com/apernet/go-tproxy v0.0.0-20230809025308-8f4723fd742f
+	github.com/apernet/hysteria/core/v2 v2.0.0-00010101000000-000000000000
+	github.com/apernet/hysteria/extras/v2 v2.0.0-00010101000000-000000000000
+	github.com/apernet/sing-tun v0.2.6-0.20240323130332-b9f6511036ad
+	github.com/caddyserver/certmagic v0.17.2
+	github.com/libdns/cloudflare v0.1.1
+	github.com/libdns/duckdns v0.2.0
+	github.com/libdns/gandi v1.0.3
+	github.com/libdns/godaddy v1.0.3
+	github.com/libdns/namedotcom v0.3.3
+	github.com/libdns/vultr v1.0.0
+	github.com/mdp/qrterminal/v3 v3.1.1
+	github.com/mholt/acmez v1.0.4
+	github.com/sagernet/sing v0.3.2
+	github.com/spf13/cobra v1.7.0
+	github.com/spf13/viper v1.15.0
+	github.com/stretchr/testify v1.9.0
+	github.com/txthinking/socks5 v0.0.0-20230325130024-4230056ae301
+	go.uber.org/zap v1.24.0
+	golang.org/x/exp v0.0.0-20240506185415-9bf2ced13842
+	golang.org/x/sys v0.25.0
+)
+
+require (
+	github.com/andybalholm/brotli v1.1.0 // indirect
+	github.com/apernet/quic-go v0.49.1-0.20250204013113-43c72b1281a0 // indirect
+	github.com/babolivier/go-doh-client v0.0.0-20201028162107-a76cff4cb8b6 // indirect
+	github.com/cloudflare/circl v1.3.9 // indirect
+	github.com/database64128/netx-go v0.0.0-20240905055117-62795b8b054a // indirect
+	github.com/database64128/tfo-go/v2 v2.2.2 // indirect
+	github.com/davecgh/go-spew v1.1.1 // indirect
+	github.com/fsnotify/fsnotify v1.7.0 // indirect
+	github.com/go-ole/go-ole v1.3.0 // indirect
+	github.com/go-task/slim-sprig v0.0.0-20230315185526-52ccab3ef572 // indirect
+	github.com/google/go-querystring v1.1.0 // indirect
+	github.com/google/pprof v0.0.0-20210407192527-94a9f03dee38 // indirect
+	github.com/hashicorp/go-cleanhttp v0.5.2 // indirect
+	github.com/hashicorp/go-retryablehttp v0.7.6 // indirect
+	github.com/hashicorp/golang-lru/v2 v2.0.5 // indirect
+	github.com/hashicorp/hcl v1.0.0 // indirect
+	github.com/inconshreveable/mousetrap v1.1.0 // indirect
+	github.com/klauspost/compress v1.17.9 // indirect
+	github.com/klauspost/cpuid/v2 v2.1.1 // indirect
+	github.com/libdns/libdns v0.2.2 // indirect
+	github.com/magiconair/properties v1.8.7 // indirect
+	github.com/miekg/dns v1.1.59 // indirect
+	github.com/mitchellh/mapstructure v1.5.0 // indirect
+	github.com/onsi/ginkgo/v2 v2.9.5 // indirect
+	github.com/patrickmn/go-cache v2.1.0+incompatible // indirect
+	github.com/pelletier/go-toml/v2 v2.0.6 // indirect
+	github.com/pkg/errors v0.9.1 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/quic-go/qpack v0.5.1 // indirect
+	github.com/refraction-networking/utls v1.6.6 // indirect
+	github.com/sagernet/netlink v0.0.0-20220905062125-8043b4a9aa97 // indirect
+	github.com/scjalliance/comshim v0.0.0-20230315213746-5e51f40bd3b9 // indirect
+	github.com/spf13/afero v1.9.3 // indirect
+	github.com/spf13/cast v1.5.0 // indirect
+	github.com/spf13/jwalterweatherman v1.1.0 // indirect
+	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/stretchr/objx v0.5.2 // indirect
+	github.com/subosito/gotenv v1.4.2 // indirect
+	github.com/txthinking/runnergroup v0.0.0-20210608031112-152c7c4432bf // indirect
+	github.com/vishvananda/netns v0.0.0-20211101163701-50045581ed74 // indirect
+	github.com/vultr/govultr/v3 v3.6.4 // indirect
+	go.uber.org/atomic v1.11.0 // indirect
+	go.uber.org/mock v0.5.0 // indirect
+	go.uber.org/multierr v1.11.0 // indirect
+	go4.org/netipx v0.0.0-20231129151722-fdeea329fbba // indirect
+	golang.org/x/crypto v0.26.0 // indirect
+	golang.org/x/mod v0.18.0 // indirect
+	golang.org/x/net v0.28.0 // indirect
+	golang.org/x/oauth2 v0.20.0 // indirect
+	golang.org/x/sync v0.8.0 // indirect
+	golang.org/x/text v0.17.0 // indirect
+	golang.org/x/tools v0.22.0 // indirect
+	google.golang.org/protobuf v1.34.1 // indirect
+	gopkg.in/ini.v1 v1.67.0 // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
+	rsc.io/qr v0.2.0 // indirect
+)
+
+replace github.com/apernet/hysteria/core/v2 => ../core
+
+replace github.com/apernet/hysteria/extras/v2 => ../extras

app/go.sum

@@ -0,0 +1,661 @@
+cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.44.3/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go v0.50.0/go.mod h1:r9sluTvynVuxRIOHXQEHMFffphuXHOMZMycpNR5e6To=
+cloud.google.com/go v0.52.0/go.mod h1:pXajvRH/6o3+F9jDHZWQ5PbGhn+o8w9qiu/CffaVdO4=
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+cloud.google.com/go/bigquery v1.5.0/go.mod h1:snEHRnqQbz117VIFhE8bmtwIDY80NLUZUMb4Nv6dBIg=
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+cloud.google.com/go/bigquery v1.8.0/go.mod h1:J5hqkt3O0uAFnINi6JXValWIb1v0goeZM77hZzJN/fQ=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/datastore v1.1.0/go.mod h1:umbIZjpQpHh4hmRpGhH4tLFup+FVzqBi1b3c64qFpCk=
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+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
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+github.com/benbjohnson/clock v1.1.0/go.mod h1:J11/hYXuz8f4ySSvYwY0FKfm+ezbsZBKZxNJlLklBHA=
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app/internal/forwarding/tcp.go

@@ -0,0 +1,62 @@
+package forwarding
+
+import (
+	"io"
+	"net"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+type TCPTunnel struct {
+	HyClient    client.Client
+	Remote      string
+	EventLogger TCPEventLogger
+}
+
+type TCPEventLogger interface {
+	Connect(addr net.Addr)
+	Error(addr net.Addr, err error)
+}
+
+func (t *TCPTunnel) Serve(listener net.Listener) error {
+	for {
+		conn, err := listener.Accept()
+		if err != nil {
+			return err
+		}
+		go t.handle(conn)
+	}
+}
+
+func (t *TCPTunnel) handle(conn net.Conn) {
+	defer conn.Close()
+
+	if t.EventLogger != nil {
+		t.EventLogger.Connect(conn.RemoteAddr())
+	}
+	var closeErr error
+	defer func() {
+		if t.EventLogger != nil {
+			t.EventLogger.Error(conn.RemoteAddr(), closeErr)
+		}
+	}()
+
+	rc, err := t.HyClient.TCP(t.Remote)
+	if err != nil {
+		closeErr = err
+		return
+	}
+	defer rc.Close()
+
+	// Start forwarding
+	copyErrChan := make(chan error, 2)
+	go func() {
+		_, copyErr := io.Copy(rc, conn)
+		copyErrChan <- copyErr
+	}()
+	go func() {
+		_, copyErr := io.Copy(conn, rc)
+		copyErrChan <- copyErr
+	}()
+	closeErr = <-copyErrChan
+}

app/internal/forwarding/tcp_test.go

@@ -0,0 +1,39 @@
+package forwarding
+
+import (
+	"crypto/rand"
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/apernet/hysteria/app/v2/internal/utils_test"
+)
+
+func TestTCPTunnel(t *testing.T) {
+	// Start the tunnel
+	l, err := net.Listen("tcp", "127.0.0.1:34567")
+	assert.NoError(t, err)
+	defer l.Close()
+	tunnel := &TCPTunnel{
+		HyClient: &utils_test.MockEchoHyClient{},
+	}
+	go tunnel.Serve(l)
+
+	for i := 0; i < 10; i++ {
+		conn, err := net.Dial("tcp", "127.0.0.1:34567")
+		assert.NoError(t, err)
+
+		data := make([]byte, 1024)
+		_, _ = rand.Read(data)
+		_, err = conn.Write(data)
+		assert.NoError(t, err)
+
+		recv := make([]byte, 1024)
+		_, err = conn.Read(recv)
+		assert.NoError(t, err)
+
+		assert.Equal(t, data, recv)
+		_ = conn.Close()
+	}
+}

app/internal/forwarding/udp.go

@@ -0,0 +1,180 @@
+package forwarding
+
+import (
+	"net"
+	"sync"
+	"sync/atomic"
+	"time"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+const (
+	udpBufferSize = 4096
+
+	defaultTimeout      = 60 * time.Second
+	idleCleanupInterval = 1 * time.Second
+)
+
+type atomicTime struct {
+	v atomic.Value
+}
+
+func newAtomicTime(t time.Time) *atomicTime {
+	a := &atomicTime{}
+	a.Set(t)
+	return a
+}
+
+func (t *atomicTime) Set(new time.Time) {
+	t.v.Store(new)
+}
+
+func (t *atomicTime) Get() time.Time {
+	return t.v.Load().(time.Time)
+}
+
+type sessionEntry struct {
+	HyConn  client.HyUDPConn
+	Last    *atomicTime
+	Timeout bool // true if the session is closed due to timeout
+}
+
+func (e *sessionEntry) Feed(data []byte, addr string) error {
+	e.Last.Set(time.Now())
+	return e.HyConn.Send(data, addr)
+}
+
+func (e *sessionEntry) ReceiveLoop(pc net.PacketConn, addr net.Addr) error {
+	for {
+		data, _, err := e.HyConn.Receive()
+		if err != nil {
+			return err
+		}
+		_, err = pc.WriteTo(data, addr)
+		if err != nil {
+			return err
+		}
+		e.Last.Set(time.Now())
+	}
+}
+
+type UDPTunnel struct {
+	HyClient    client.Client
+	Remote      string
+	Timeout     time.Duration
+	EventLogger UDPEventLogger
+
+	m     map[string]*sessionEntry // addr -> HyConn
+	mutex sync.RWMutex
+}
+
+type UDPEventLogger interface {
+	Connect(addr net.Addr)
+	Error(addr net.Addr, err error)
+}
+
+func (t *UDPTunnel) Serve(pc net.PacketConn) error {
+	t.m = make(map[string]*sessionEntry)
+
+	stopCh := make(chan struct{})
+	go t.idleCleanupLoop(stopCh)
+	defer close(stopCh)
+	defer t.cleanup(false)
+
+	buf := make([]byte, udpBufferSize)
+	for {
+		n, addr, err := pc.ReadFrom(buf)
+		if err != nil {
+			return err
+		}
+		t.feed(pc, addr, buf[:n])
+	}
+}
+
+func (t *UDPTunnel) idleCleanupLoop(stopCh <-chan struct{}) {
+	ticker := time.NewTicker(idleCleanupInterval)
+	defer ticker.Stop()
+	for {
+		select {
+		case <-ticker.C:
+			t.cleanup(true)
+		case <-stopCh:
+			return
+		}
+	}
+}
+
+func (t *UDPTunnel) cleanup(idleOnly bool) {
+	// We use RLock here as we are only scanning the map, not deleting from it.
+	t.mutex.RLock()
+	defer t.mutex.RUnlock()
+
+	timeout := t.Timeout
+	if timeout == 0 {
+		timeout = defaultTimeout
+	}
+
+	now := time.Now()
+	for _, entry := range t.m {
+		if !idleOnly || now.Sub(entry.Last.Get()) > timeout {
+			entry.Timeout = true
+			_ = entry.HyConn.Close()
+			// Closing the connection here will cause the ReceiveLoop to exit,
+			// and the session will be removed from the map there.
+		}
+	}
+}
+
+func (t *UDPTunnel) feed(pc net.PacketConn, addr net.Addr, data []byte) {
+	t.mutex.RLock()
+	entry := t.m[addr.String()]
+	t.mutex.RUnlock()
+
+	// Create a new session if not exists
+	if entry == nil {
+		if t.EventLogger != nil {
+			t.EventLogger.Connect(addr)
+		}
+		hyConn, err := t.HyClient.UDP()
+		if err != nil {
+			if t.EventLogger != nil {
+				t.EventLogger.Error(addr, err)
+			}
+			return
+		}
+		entry = &sessionEntry{
+			HyConn: hyConn,
+			Last:   newAtomicTime(time.Now()),
+		}
+		// Start the receive loop for this session
+		// Local <- Remote
+		go func() {
+			err := entry.ReceiveLoop(pc, addr)
+			if !entry.Timeout {
+				_ = hyConn.Close()
+				if t.EventLogger != nil {
+					t.EventLogger.Error(addr, err)
+				}
+			} else {
+				// Connection already closed by timeout cleanup,
+				// no need to close again here.
+				// Use nil error to indicate timeout.
+				if t.EventLogger != nil {
+					t.EventLogger.Error(addr, nil)
+				}
+			}
+			// Remove the session from the map
+			t.mutex.Lock()
+			delete(t.m, addr.String())
+			t.mutex.Unlock()
+		}()
+		// Insert the session into the map
+		t.mutex.Lock()
+		t.m[addr.String()] = entry
+		t.mutex.Unlock()
+	}
+
+	// Feed the message to the session
+	_ = entry.Feed(data, t.Remote)
+}

app/internal/forwarding/udp_test.go

@@ -0,0 +1,39 @@
+package forwarding
+
+import (
+	"crypto/rand"
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/apernet/hysteria/app/v2/internal/utils_test"
+)
+
+func TestUDPTunnel(t *testing.T) {
+	// Start the tunnel
+	l, err := net.ListenPacket("udp", "127.0.0.1:34567")
+	assert.NoError(t, err)
+	defer l.Close()
+	tunnel := &UDPTunnel{
+		HyClient: &utils_test.MockEchoHyClient{},
+	}
+	go tunnel.Serve(l)
+
+	for i := 0; i < 10; i++ {
+		conn, err := net.Dial("udp", "127.0.0.1:34567")
+		assert.NoError(t, err)
+
+		data := make([]byte, 1024)
+		_, _ = rand.Read(data)
+		_, err = conn.Write(data)
+		assert.NoError(t, err)
+
+		recv := make([]byte, 1024)
+		_, err = conn.Read(recv)
+		assert.NoError(t, err)
+
+		assert.Equal(t, data, recv)
+		_ = conn.Close()
+	}
+}

app/internal/http/server.go

@@ -0,0 +1,301 @@
+package http
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"strings"
+	"time"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+const (
+	httpClientTimeout = 10 * time.Second
+)
+
+// Server is an HTTP server using a Hysteria client as outbound.
+type Server struct {
+	HyClient    client.Client
+	AuthFunc    func(username, password string) bool // nil = no authentication
+	AuthRealm   string
+	EventLogger EventLogger
+
+	httpClient *http.Client
+}
+
+type EventLogger interface {
+	ConnectRequest(addr net.Addr, reqAddr string)
+	ConnectError(addr net.Addr, reqAddr string, err error)
+	HTTPRequest(addr net.Addr, reqURL string)
+	HTTPError(addr net.Addr, reqURL string, err error)
+}
+
+func (s *Server) Serve(listener net.Listener) error {
+	for {
+		conn, err := listener.Accept()
+		if err != nil {
+			return err
+		}
+		go s.dispatch(conn)
+	}
+}
+
+func (s *Server) dispatch(conn net.Conn) {
+	bufReader := bufio.NewReader(conn)
+	for {
+		req, err := http.ReadRequest(bufReader)
+		if err != nil {
+			// Connection error or invalid request
+			_ = conn.Close()
+			return
+		}
+		if s.AuthFunc != nil {
+			authOK := false
+			// Check the Proxy-Authorization header
+			pAuth := req.Header.Get("Proxy-Authorization")
+			if strings.HasPrefix(pAuth, "Basic ") {
+				userPass, err := base64.URLEncoding.DecodeString(pAuth[6:])
+				if err == nil {
+					userPassParts := strings.SplitN(string(userPass), ":", 2)
+					if len(userPassParts) == 2 {
+						authOK = s.AuthFunc(userPassParts[0], userPassParts[1])
+					}
+				}
+			}
+			if !authOK {
+				// Proxy authentication required
+				_ = sendProxyAuthRequired(conn, req, s.AuthRealm)
+				_ = conn.Close()
+				return
+			}
+		}
+		if req.Method == http.MethodConnect {
+			if bufReader.Buffered() > 0 {
+				// There is still data in the buffered reader.
+				// We need to get it out and put it into a cachedConn,
+				// so that handleConnect can read it.
+				data := make([]byte, bufReader.Buffered())
+				_, err := io.ReadFull(bufReader, data)
+				if err != nil {
+					// Read from buffer failed, is this possible?
+					_ = conn.Close()
+					return
+				}
+				cachedConn := &cachedConn{
+					Conn:   conn,
+					Buffer: *bytes.NewBuffer(data),
+				}
+				s.handleConnect(cachedConn, req)
+			} else {
+				// No data in the buffered reader, we can just pass the original connection.
+				s.handleConnect(conn, req)
+			}
+			// handleConnect will take over the connection,
+			// i.e. it will not return until the connection is closed.
+			// When it returns, there will be no more requests from this connection,
+			// so we simply exit the loop.
+			return
+		} else {
+			// handleRequest on the other hand handles one request at a time,
+			// and returns when the request is done. It returns a bool indicating
+			// whether the connection should be kept alive, but itself never closes
+			// the connection.
+			keepAlive := s.handleRequest(conn, req)
+			if !keepAlive {
+				_ = conn.Close()
+				return
+			}
+		}
+	}
+}
+
+// cachedConn is a net.Conn wrapper that first Read()s from a buffer,
+// and then from the underlying net.Conn when the buffer is drained.
+type cachedConn struct {
+	net.Conn
+	Buffer bytes.Buffer
+}
+
+func (c *cachedConn) Read(b []byte) (int, error) {
+	if c.Buffer.Len() > 0 {
+		n, err := c.Buffer.Read(b)
+		if err == io.EOF {
+			// Buffer is drained, hide it from the caller
+			err = nil
+		}
+		return n, err
+	}
+	return c.Conn.Read(b)
+}
+
+func (s *Server) handleConnect(conn net.Conn, req *http.Request) {
+	defer conn.Close()
+
+	port := req.URL.Port()
+	if port == "" {
+		// HTTP defaults to port 80
+		port = "80"
+	}
+	reqAddr := net.JoinHostPort(req.URL.Hostname(), port)
+
+	// Connect request & error log
+	if s.EventLogger != nil {
+		s.EventLogger.ConnectRequest(conn.RemoteAddr(), reqAddr)
+	}
+	var closeErr error
+	defer func() {
+		if s.EventLogger != nil {
+			s.EventLogger.ConnectError(conn.RemoteAddr(), reqAddr, closeErr)
+		}
+	}()
+
+	// Dial
+	rConn, err := s.HyClient.TCP(reqAddr)
+	if err != nil {
+		_ = sendSimpleResponse(conn, req, http.StatusBadGateway)
+		closeErr = err
+		return
+	}
+	defer rConn.Close()
+
+	// Send 200 OK response and start relaying
+	_ = sendSimpleResponse(conn, req, http.StatusOK)
+	copyErrChan := make(chan error, 2)
+	go func() {
+		_, err := io.Copy(rConn, conn)
+		copyErrChan <- err
+	}()
+	go func() {
+		_, err := io.Copy(conn, rConn)
+		copyErrChan <- err
+	}()
+	closeErr = <-copyErrChan
+}
+
+func (s *Server) handleRequest(conn net.Conn, req *http.Request) bool {
+	// Some clients use Connection, some use Proxy-Connection
+	// https://www.oreilly.com/library/view/http-the-definitive/1565925092/re40.html
+	keepAlive := req.ProtoAtLeast(1, 1) &&
+		(strings.ToLower(req.Header.Get("Proxy-Connection")) == "keep-alive" ||
+			strings.ToLower(req.Header.Get("Connection")) == "keep-alive")
+	req.RequestURI = "" // Outgoing request should not have RequestURI
+
+	removeHopByHopHeaders(req.Header)
+	removeExtraHTTPHostPort(req)
+
+	if req.URL.Scheme == "" || req.URL.Host == "" {
+		_ = sendSimpleResponse(conn, req, http.StatusBadRequest)
+		return false
+	}
+
+	// Request & error log
+	if s.EventLogger != nil {
+		s.EventLogger.HTTPRequest(conn.RemoteAddr(), req.URL.String())
+	}
+	var closeErr error
+	defer func() {
+		if s.EventLogger != nil {
+			s.EventLogger.HTTPError(conn.RemoteAddr(), req.URL.String(), closeErr)
+		}
+	}()
+
+	if s.httpClient == nil {
+		s.initHTTPClient()
+	}
+
+	// Do the request and send the response back
+	resp, err := s.httpClient.Do(req)
+	if err != nil {
+		closeErr = err
+		_ = sendSimpleResponse(conn, req, http.StatusBadGateway)
+		return false
+	}
+
+	removeHopByHopHeaders(resp.Header)
+	if keepAlive {
+		resp.Header.Set("Connection", "keep-alive")
+		resp.Header.Set("Proxy-Connection", "keep-alive")
+		resp.Header.Set("Keep-Alive", "timeout=60")
+	}
+
+	closeErr = resp.Write(conn)
+	return closeErr == nil && keepAlive
+}
+
+func (s *Server) initHTTPClient() {
+	s.httpClient = &http.Client{
+		Transport: &http.Transport{
+			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+				// HyClient doesn't support context for now
+				return s.HyClient.TCP(addr)
+			},
+		},
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+		Timeout: httpClientTimeout,
+	}
+}
+
+func removeHopByHopHeaders(header http.Header) {
+	header.Del("Proxy-Connection") // Not in RFC but common
+	// https://www.ietf.org/rfc/rfc2616.txt
+	header.Del("Connection")
+	header.Del("Keep-Alive")
+	header.Del("Proxy-Authenticate")
+	header.Del("Proxy-Authorization")
+	header.Del("TE")
+	header.Del("Trailers")
+	header.Del("Transfer-Encoding")
+	header.Del("Upgrade")
+}
+
+func removeExtraHTTPHostPort(req *http.Request) {
+	host := req.Host
+	if host == "" {
+		host = req.URL.Host
+	}
+	if pHost, port, err := net.SplitHostPort(host); err == nil && port == "80" {
+		host = pHost
+	}
+	req.Host = host
+	req.URL.Host = host
+}
+
+// sendSimpleResponse sends a simple HTTP response with the given status code.
+func sendSimpleResponse(conn net.Conn, req *http.Request, statusCode int) error {
+	resp := &http.Response{
+		StatusCode: statusCode,
+		Status:     http.StatusText(statusCode),
+		Proto:      req.Proto,
+		ProtoMajor: req.ProtoMajor,
+		ProtoMinor: req.ProtoMinor,
+		Header:     http.Header{},
+	}
+	// Remove the "Content-Length: 0" header, some clients (e.g. ffmpeg) may not like it.
+	resp.ContentLength = -1
+	// Also, prevent the "Connection: close" header.
+	resp.Close = false
+	resp.Uncompressed = true
+	return resp.Write(conn)
+}
+
+// sendProxyAuthRequired sends a 407 Proxy Authentication Required response.
+func sendProxyAuthRequired(conn net.Conn, req *http.Request, realm string) error {
+	resp := &http.Response{
+		StatusCode: http.StatusProxyAuthRequired,
+		Status:     http.StatusText(http.StatusProxyAuthRequired),
+		Proto:      req.Proto,
+		ProtoMajor: req.ProtoMajor,
+		ProtoMinor: req.ProtoMinor,
+		Header:     http.Header{},
+	}
+	resp.Header.Set("Proxy-Authenticate", fmt.Sprintf("Basic realm=%q", realm))
+	return resp.Write(conn)
+}

app/internal/http/server_test.go

@@ -0,0 +1,59 @@
+package http
+
+import (
+	"errors"
+	"net"
+	"net/http"
+	"os/exec"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+const (
+	testCertFile = "test.crt"
+	testKeyFile  = "test.key"
+)
+
+type mockHyClient struct{}
+
+func (c *mockHyClient) TCP(addr string) (net.Conn, error) {
+	return net.Dial("tcp", addr)
+}
+
+func (c *mockHyClient) UDP() (client.HyUDPConn, error) {
+	return nil, errors.New("not implemented")
+}
+
+func (c *mockHyClient) Close() error {
+	return nil
+}
+
+func TestServer(t *testing.T) {
+	// Start the server
+	l, err := net.Listen("tcp", "127.0.0.1:18080")
+	assert.NoError(t, err)
+	defer l.Close()
+	s := &Server{
+		HyClient: &mockHyClient{},
+	}
+	go s.Serve(l)
+
+	// Start a test HTTP & HTTPS server
+	http.HandleFunc("/", func(w http.ResponseWriter, r *http.Request) {
+		w.Write([]byte("control is an illusion"))
+	})
+	go http.ListenAndServe("127.0.0.1:18081", nil)
+	go http.ListenAndServeTLS("127.0.0.1:18082", testCertFile, testKeyFile, nil)
+
+	// Run the Python test script
+	cmd := exec.Command("python", "server_test.py")
+	// Suppress HTTPS warning text from Python
+	cmd.Env = append(cmd.Env, "PYTHONWARNINGS=ignore:Unverified HTTPS request")
+	out, err := cmd.CombinedOutput()
+	assert.NoError(t, err)
+	assert.Equal(t, "OK", strings.TrimSpace(string(out)))
+}

app/internal/http/server_test.py

@@ -0,0 +1,24 @@
+import requests
+
+proxies = {
+    "http": "http://127.0.0.1:18080",
+    "https": "http://127.0.0.1:18080",
+}
+
+
+def test_http(it):
+    for i in range(it):
+        r = requests.get("http://127.0.0.1:18081", proxies=proxies)
+        assert r.status_code == 200 and r.text == "control is an illusion"
+
+
+def test_https(it):
+    for i in range(it):
+        r = requests.get("https://127.0.0.1:18082", proxies=proxies, verify=False)
+        assert r.status_code == 200 and r.text == "control is an illusion"
+
+
+if __name__ == "__main__":
+    test_http(10)
+    test_https(10)
+    print("OK")

app/internal/http/test.crt

@@ -0,0 +1,23 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----

app/internal/http/test.key

@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+T3lUEjECgYEA84mrs4TLuPfklsQM4WPBdN/2Ud1r0Zn/W8icHcVc/DCFXbcV4aPA
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+o/Hp1ANSILecknQXeE1qDlHVeGAq2k3vAQH2J0m7lMfar7QCBTMTMHcCgYEA8PkO
+Uj9+/LoHod2eb4raH29wntis31X5FX/C/8HlmFmQplxfMxpRckzDYQELdHvDggNY
+ZQo6pdE22MjCu2bk9AHa2ukMyieWm/mPe46Upr1YV2o5cWnfFFNa/LP2Ii/dWY5V
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+uhyq0oGE0pnlMOLFMyceQXTmb9wqYIchgVHmDBvbZgfWafEBXt1/vYB0v0ltpzw+
+menJAoGBAI0hx3+mrFgA+xJBEk4oexAlro1qbNWoR7BCmLQtd49jG3eZQu4JxWH2
+kh58AIXzLl0X9t4pfMYasYL6jBGvw+AqNdo2krpiL7MWEE8w8FP/wibzqmuloziB
+T7BZuCZjpcAM0IxLmQeeUK0LF0mihcqvssxveaet46mj7QoA7bGQ
+-----END RSA PRIVATE KEY-----

app/internal/proxymux/.mockery.yaml

@@ -0,0 +1,12 @@
+with-expecter: true
+dir: internal/mocks
+outpkg: mocks
+packages:
+  net:
+    interfaces:
+      Listener:
+        config:
+          mockname: MockListener
+      Conn:
+        config:
+          mockname: MockConn

app/internal/proxymux/internal/mocks/mock_Conn.go

@@ -0,0 +1,427 @@
+// Code generated by mockery v2.43.0. DO NOT EDIT.
+
+package mocks
+
+import (
+	net "net"
+
+	mock "github.com/stretchr/testify/mock"
+
+	time "time"
+)
+
+// MockConn is an autogenerated mock type for the Conn type
+type MockConn struct {
+	mock.Mock
+}
+
+type MockConn_Expecter struct {
+	mock *mock.Mock
+}
+
+func (_m *MockConn) EXPECT() *MockConn_Expecter {
+	return &MockConn_Expecter{mock: &_m.Mock}
+}
+
+// Close provides a mock function with given fields:
+func (_m *MockConn) Close() error {
+	ret := _m.Called()
+
+	if len(ret) == 0 {
+		panic("no return value specified for Close")
+	}
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func() error); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// MockConn_Close_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'Close'
+type MockConn_Close_Call struct {
+	*mock.Call
+}
+
+// Close is a helper method to define mock.On call
+func (_e *MockConn_Expecter) Close() *MockConn_Close_Call {
+	return &MockConn_Close_Call{Call: _e.mock.On("Close")}
+}
+
+func (_c *MockConn_Close_Call) Run(run func()) *MockConn_Close_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run()
+	})
+	return _c
+}
+
+func (_c *MockConn_Close_Call) Return(_a0 error) *MockConn_Close_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+func (_c *MockConn_Close_Call) RunAndReturn(run func() error) *MockConn_Close_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
+// LocalAddr provides a mock function with given fields:
+func (_m *MockConn) LocalAddr() net.Addr {
+	ret := _m.Called()
+
+	if len(ret) == 0 {
+		panic("no return value specified for LocalAddr")
+	}
+
+	var r0 net.Addr
+	if rf, ok := ret.Get(0).(func() net.Addr); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(net.Addr)
+		}
+	}
+
+	return r0
+}
+
+// MockConn_LocalAddr_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'LocalAddr'
+type MockConn_LocalAddr_Call struct {
+	*mock.Call
+}
+
+// LocalAddr is a helper method to define mock.On call
+func (_e *MockConn_Expecter) LocalAddr() *MockConn_LocalAddr_Call {
+	return &MockConn_LocalAddr_Call{Call: _e.mock.On("LocalAddr")}
+}
+
+func (_c *MockConn_LocalAddr_Call) Run(run func()) *MockConn_LocalAddr_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run()
+	})
+	return _c
+}
+
+func (_c *MockConn_LocalAddr_Call) Return(_a0 net.Addr) *MockConn_LocalAddr_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+func (_c *MockConn_LocalAddr_Call) RunAndReturn(run func() net.Addr) *MockConn_LocalAddr_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
+// Read provides a mock function with given fields: b
+func (_m *MockConn) Read(b []byte) (int, error) {
+	ret := _m.Called(b)
+
+	if len(ret) == 0 {
+		panic("no return value specified for Read")
+	}
+
+	var r0 int
+	var r1 error
+	if rf, ok := ret.Get(0).(func([]byte) (int, error)); ok {
+		return rf(b)
+	}
+	if rf, ok := ret.Get(0).(func([]byte) int); ok {
+		r0 = rf(b)
+	} else {
+		r0 = ret.Get(0).(int)
+	}
+
+	if rf, ok := ret.Get(1).(func([]byte) error); ok {
+		r1 = rf(b)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// MockConn_Read_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'Read'
+type MockConn_Read_Call struct {
+	*mock.Call
+}
+
+// Read is a helper method to define mock.On call
+//   - b []byte
+func (_e *MockConn_Expecter) Read(b interface{}) *MockConn_Read_Call {
+	return &MockConn_Read_Call{Call: _e.mock.On("Read", b)}
+}
+
+func (_c *MockConn_Read_Call) Run(run func(b []byte)) *MockConn_Read_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].([]byte))
+	})
+	return _c
+}
+
+func (_c *MockConn_Read_Call) Return(n int, err error) *MockConn_Read_Call {
+	_c.Call.Return(n, err)
+	return _c
+}
+
+func (_c *MockConn_Read_Call) RunAndReturn(run func([]byte) (int, error)) *MockConn_Read_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
+// RemoteAddr provides a mock function with given fields:
+func (_m *MockConn) RemoteAddr() net.Addr {
+	ret := _m.Called()
+
+	if len(ret) == 0 {
+		panic("no return value specified for RemoteAddr")
+	}
+
+	var r0 net.Addr
+	if rf, ok := ret.Get(0).(func() net.Addr); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(net.Addr)
+		}
+	}
+
+	return r0
+}
+
+// MockConn_RemoteAddr_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'RemoteAddr'
+type MockConn_RemoteAddr_Call struct {
+	*mock.Call
+}
+
+// RemoteAddr is a helper method to define mock.On call
+func (_e *MockConn_Expecter) RemoteAddr() *MockConn_RemoteAddr_Call {
+	return &MockConn_RemoteAddr_Call{Call: _e.mock.On("RemoteAddr")}
+}
+
+func (_c *MockConn_RemoteAddr_Call) Run(run func()) *MockConn_RemoteAddr_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run()
+	})
+	return _c
+}
+
+func (_c *MockConn_RemoteAddr_Call) Return(_a0 net.Addr) *MockConn_RemoteAddr_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+func (_c *MockConn_RemoteAddr_Call) RunAndReturn(run func() net.Addr) *MockConn_RemoteAddr_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
+// SetDeadline provides a mock function with given fields: t
+func (_m *MockConn) SetDeadline(t time.Time) error {
+	ret := _m.Called(t)
+
+	if len(ret) == 0 {
+		panic("no return value specified for SetDeadline")
+	}
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(time.Time) error); ok {
+		r0 = rf(t)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// MockConn_SetDeadline_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'SetDeadline'
+type MockConn_SetDeadline_Call struct {
+	*mock.Call
+}
+
+// SetDeadline is a helper method to define mock.On call
+//   - t time.Time
+func (_e *MockConn_Expecter) SetDeadline(t interface{}) *MockConn_SetDeadline_Call {
+	return &MockConn_SetDeadline_Call{Call: _e.mock.On("SetDeadline", t)}
+}
+
+func (_c *MockConn_SetDeadline_Call) Run(run func(t time.Time)) *MockConn_SetDeadline_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(time.Time))
+	})
+	return _c
+}
+
+func (_c *MockConn_SetDeadline_Call) Return(_a0 error) *MockConn_SetDeadline_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+func (_c *MockConn_SetDeadline_Call) RunAndReturn(run func(time.Time) error) *MockConn_SetDeadline_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
+// SetReadDeadline provides a mock function with given fields: t
+func (_m *MockConn) SetReadDeadline(t time.Time) error {
+	ret := _m.Called(t)
+
+	if len(ret) == 0 {
+		panic("no return value specified for SetReadDeadline")
+	}
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(time.Time) error); ok {
+		r0 = rf(t)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// MockConn_SetReadDeadline_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'SetReadDeadline'
+type MockConn_SetReadDeadline_Call struct {
+	*mock.Call
+}
+
+// SetReadDeadline is a helper method to define mock.On call
+//   - t time.Time
+func (_e *MockConn_Expecter) SetReadDeadline(t interface{}) *MockConn_SetReadDeadline_Call {
+	return &MockConn_SetReadDeadline_Call{Call: _e.mock.On("SetReadDeadline", t)}
+}
+
+func (_c *MockConn_SetReadDeadline_Call) Run(run func(t time.Time)) *MockConn_SetReadDeadline_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(time.Time))
+	})
+	return _c
+}
+
+func (_c *MockConn_SetReadDeadline_Call) Return(_a0 error) *MockConn_SetReadDeadline_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+func (_c *MockConn_SetReadDeadline_Call) RunAndReturn(run func(time.Time) error) *MockConn_SetReadDeadline_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
+// SetWriteDeadline provides a mock function with given fields: t
+func (_m *MockConn) SetWriteDeadline(t time.Time) error {
+	ret := _m.Called(t)
+
+	if len(ret) == 0 {
+		panic("no return value specified for SetWriteDeadline")
+	}
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func(time.Time) error); ok {
+		r0 = rf(t)
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// MockConn_SetWriteDeadline_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'SetWriteDeadline'
+type MockConn_SetWriteDeadline_Call struct {
+	*mock.Call
+}
+
+// SetWriteDeadline is a helper method to define mock.On call
+//   - t time.Time
+func (_e *MockConn_Expecter) SetWriteDeadline(t interface{}) *MockConn_SetWriteDeadline_Call {
+	return &MockConn_SetWriteDeadline_Call{Call: _e.mock.On("SetWriteDeadline", t)}
+}
+
+func (_c *MockConn_SetWriteDeadline_Call) Run(run func(t time.Time)) *MockConn_SetWriteDeadline_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].(time.Time))
+	})
+	return _c
+}
+
+func (_c *MockConn_SetWriteDeadline_Call) Return(_a0 error) *MockConn_SetWriteDeadline_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+func (_c *MockConn_SetWriteDeadline_Call) RunAndReturn(run func(time.Time) error) *MockConn_SetWriteDeadline_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
+// Write provides a mock function with given fields: b
+func (_m *MockConn) Write(b []byte) (int, error) {
+	ret := _m.Called(b)
+
+	if len(ret) == 0 {
+		panic("no return value specified for Write")
+	}
+
+	var r0 int
+	var r1 error
+	if rf, ok := ret.Get(0).(func([]byte) (int, error)); ok {
+		return rf(b)
+	}
+	if rf, ok := ret.Get(0).(func([]byte) int); ok {
+		r0 = rf(b)
+	} else {
+		r0 = ret.Get(0).(int)
+	}
+
+	if rf, ok := ret.Get(1).(func([]byte) error); ok {
+		r1 = rf(b)
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// MockConn_Write_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'Write'
+type MockConn_Write_Call struct {
+	*mock.Call
+}
+
+// Write is a helper method to define mock.On call
+//   - b []byte
+func (_e *MockConn_Expecter) Write(b interface{}) *MockConn_Write_Call {
+	return &MockConn_Write_Call{Call: _e.mock.On("Write", b)}
+}
+
+func (_c *MockConn_Write_Call) Run(run func(b []byte)) *MockConn_Write_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run(args[0].([]byte))
+	})
+	return _c
+}
+
+func (_c *MockConn_Write_Call) Return(n int, err error) *MockConn_Write_Call {
+	_c.Call.Return(n, err)
+	return _c
+}
+
+func (_c *MockConn_Write_Call) RunAndReturn(run func([]byte) (int, error)) *MockConn_Write_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
+// NewMockConn creates a new instance of MockConn. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
+// The first argument is typically a *testing.T value.
+func NewMockConn(t interface {
+	mock.TestingT
+	Cleanup(func())
+}) *MockConn {
+	mock := &MockConn{}
+	mock.Mock.Test(t)
+
+	t.Cleanup(func() { mock.AssertExpectations(t) })
+
+	return mock
+}

app/internal/proxymux/internal/mocks/mock_Listener.go

@@ -0,0 +1,185 @@
+// Code generated by mockery v2.43.0. DO NOT EDIT.
+
+package mocks
+
+import (
+	net "net"
+
+	mock "github.com/stretchr/testify/mock"
+)
+
+// MockListener is an autogenerated mock type for the Listener type
+type MockListener struct {
+	mock.Mock
+}
+
+type MockListener_Expecter struct {
+	mock *mock.Mock
+}
+
+func (_m *MockListener) EXPECT() *MockListener_Expecter {
+	return &MockListener_Expecter{mock: &_m.Mock}
+}
+
+// Accept provides a mock function with given fields:
+func (_m *MockListener) Accept() (net.Conn, error) {
+	ret := _m.Called()
+
+	if len(ret) == 0 {
+		panic("no return value specified for Accept")
+	}
+
+	var r0 net.Conn
+	var r1 error
+	if rf, ok := ret.Get(0).(func() (net.Conn, error)); ok {
+		return rf()
+	}
+	if rf, ok := ret.Get(0).(func() net.Conn); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(net.Conn)
+		}
+	}
+
+	if rf, ok := ret.Get(1).(func() error); ok {
+		r1 = rf()
+	} else {
+		r1 = ret.Error(1)
+	}
+
+	return r0, r1
+}
+
+// MockListener_Accept_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'Accept'
+type MockListener_Accept_Call struct {
+	*mock.Call
+}
+
+// Accept is a helper method to define mock.On call
+func (_e *MockListener_Expecter) Accept() *MockListener_Accept_Call {
+	return &MockListener_Accept_Call{Call: _e.mock.On("Accept")}
+}
+
+func (_c *MockListener_Accept_Call) Run(run func()) *MockListener_Accept_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run()
+	})
+	return _c
+}
+
+func (_c *MockListener_Accept_Call) Return(_a0 net.Conn, _a1 error) *MockListener_Accept_Call {
+	_c.Call.Return(_a0, _a1)
+	return _c
+}
+
+func (_c *MockListener_Accept_Call) RunAndReturn(run func() (net.Conn, error)) *MockListener_Accept_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
+// Addr provides a mock function with given fields:
+func (_m *MockListener) Addr() net.Addr {
+	ret := _m.Called()
+
+	if len(ret) == 0 {
+		panic("no return value specified for Addr")
+	}
+
+	var r0 net.Addr
+	if rf, ok := ret.Get(0).(func() net.Addr); ok {
+		r0 = rf()
+	} else {
+		if ret.Get(0) != nil {
+			r0 = ret.Get(0).(net.Addr)
+		}
+	}
+
+	return r0
+}
+
+// MockListener_Addr_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'Addr'
+type MockListener_Addr_Call struct {
+	*mock.Call
+}
+
+// Addr is a helper method to define mock.On call
+func (_e *MockListener_Expecter) Addr() *MockListener_Addr_Call {
+	return &MockListener_Addr_Call{Call: _e.mock.On("Addr")}
+}
+
+func (_c *MockListener_Addr_Call) Run(run func()) *MockListener_Addr_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run()
+	})
+	return _c
+}
+
+func (_c *MockListener_Addr_Call) Return(_a0 net.Addr) *MockListener_Addr_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+func (_c *MockListener_Addr_Call) RunAndReturn(run func() net.Addr) *MockListener_Addr_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
+// Close provides a mock function with given fields:
+func (_m *MockListener) Close() error {
+	ret := _m.Called()
+
+	if len(ret) == 0 {
+		panic("no return value specified for Close")
+	}
+
+	var r0 error
+	if rf, ok := ret.Get(0).(func() error); ok {
+		r0 = rf()
+	} else {
+		r0 = ret.Error(0)
+	}
+
+	return r0
+}
+
+// MockListener_Close_Call is a *mock.Call that shadows Run/Return methods with type explicit version for method 'Close'
+type MockListener_Close_Call struct {
+	*mock.Call
+}
+
+// Close is a helper method to define mock.On call
+func (_e *MockListener_Expecter) Close() *MockListener_Close_Call {
+	return &MockListener_Close_Call{Call: _e.mock.On("Close")}
+}
+
+func (_c *MockListener_Close_Call) Run(run func()) *MockListener_Close_Call {
+	_c.Call.Run(func(args mock.Arguments) {
+		run()
+	})
+	return _c
+}
+
+func (_c *MockListener_Close_Call) Return(_a0 error) *MockListener_Close_Call {
+	_c.Call.Return(_a0)
+	return _c
+}
+
+func (_c *MockListener_Close_Call) RunAndReturn(run func() error) *MockListener_Close_Call {
+	_c.Call.Return(run)
+	return _c
+}
+
+// NewMockListener creates a new instance of MockListener. It also registers a testing interface on the mock and a cleanup function to assert the mocks expectations.
+// The first argument is typically a *testing.T value.
+func NewMockListener(t interface {
+	mock.TestingT
+	Cleanup(func())
+}) *MockListener {
+	mock := &MockListener{}
+	mock.Mock.Test(t)
+
+	t.Cleanup(func() { mock.AssertExpectations(t) })
+
+	return mock
+}

app/internal/proxymux/manager.go

@@ -0,0 +1,72 @@
+package proxymux
+
+import (
+	"net"
+	"sync"
+
+	"github.com/apernet/hysteria/extras/v2/correctnet"
+)
+
+type muxManager struct {
+	listeners map[string]*muxListener
+	lock      sync.Mutex
+}
+
+var globalMuxManager *muxManager
+
+func init() {
+	globalMuxManager = &muxManager{
+		listeners: make(map[string]*muxListener),
+	}
+}
+
+func (m *muxManager) GetOrCreate(address string) (*muxListener, error) {
+	key, err := m.canonicalizeAddrPort(address)
+	if err != nil {
+		return nil, err
+	}
+
+	m.lock.Lock()
+	defer m.lock.Unlock()
+
+	if ml, ok := m.listeners[key]; ok {
+		return ml, nil
+	}
+
+	listener, err := correctnet.Listen("tcp", key)
+	if err != nil {
+		return nil, err
+	}
+
+	ml := newMuxListener(listener, func() {
+		m.lock.Lock()
+		defer m.lock.Unlock()
+		delete(m.listeners, key)
+	})
+	m.listeners[key] = ml
+	return ml, nil
+}
+
+func (m *muxManager) canonicalizeAddrPort(address string) (string, error) {
+	taddr, err := net.ResolveTCPAddr("tcp", address)
+	if err != nil {
+		return "", err
+	}
+	return taddr.String(), nil
+}
+
+func ListenHTTP(address string) (net.Listener, error) {
+	ml, err := globalMuxManager.GetOrCreate(address)
+	if err != nil {
+		return nil, err
+	}
+	return ml.ListenHTTP()
+}
+
+func ListenSOCKS(address string) (net.Listener, error) {
+	ml, err := globalMuxManager.GetOrCreate(address)
+	if err != nil {
+		return nil, err
+	}
+	return ml.ListenSOCKS()
+}

app/internal/proxymux/manager_test.go

@@ -0,0 +1,110 @@
+package proxymux
+
+import (
+	"net"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestListenSOCKS(t *testing.T) {
+	address := "127.2.39.129:11081"
+
+	sl, err := ListenSOCKS(address)
+	if !assert.NoError(t, err) {
+		return
+	}
+	defer func() {
+		sl.Close()
+	}()
+
+	hl, err := ListenHTTP(address)
+	if !assert.NoError(t, err) {
+		return
+	}
+	defer hl.Close()
+
+	_, err = ListenSOCKS(address)
+	if !assert.ErrorIs(t, err, ErrProtocolInUse) {
+		return
+	}
+	sl.Close()
+
+	sl, err = ListenSOCKS(address)
+	if !assert.NoError(t, err) {
+		return
+	}
+}
+
+func TestListenHTTP(t *testing.T) {
+	address := "127.2.39.129:11082"
+
+	hl, err := ListenHTTP(address)
+	if !assert.NoError(t, err) {
+		return
+	}
+	defer func() {
+		hl.Close()
+	}()
+
+	sl, err := ListenSOCKS(address)
+	if !assert.NoError(t, err) {
+		return
+	}
+	defer sl.Close()
+
+	_, err = ListenHTTP(address)
+	if !assert.ErrorIs(t, err, ErrProtocolInUse) {
+		return
+	}
+	hl.Close()
+
+	hl, err = ListenHTTP(address)
+	if !assert.NoError(t, err) {
+		return
+	}
+}
+
+func TestRelease(t *testing.T) {
+	address := "127.2.39.129:11083"
+
+	hl, err := ListenHTTP(address)
+	if !assert.NoError(t, err) {
+		return
+	}
+	sl, err := ListenSOCKS(address)
+	if !assert.NoError(t, err) {
+		return
+	}
+
+	if !assert.True(t, globalMuxManager.testAddressExists(address)) {
+		return
+	}
+	_, err = net.Listen("tcp", address)
+	if !assert.Error(t, err) {
+		return
+	}
+
+	hl.Close()
+	sl.Close()
+
+	// Wait for muxListener released
+	time.Sleep(time.Second)
+	if !assert.False(t, globalMuxManager.testAddressExists(address)) {
+		return
+	}
+	lis, err := net.Listen("tcp", address)
+	if !assert.NoError(t, err) {
+		return
+	}
+	defer lis.Close()
+}
+
+func (m *muxManager) testAddressExists(address string) bool {
+	m.lock.Lock()
+	defer m.lock.Unlock()
+
+	_, ok := m.listeners[address]
+	return ok
+}

app/internal/proxymux/mux.go

@@ -0,0 +1,320 @@
+package proxymux
+
+import (
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"sync"
+)
+
+func newMuxListener(listener net.Listener, deleteFunc func()) *muxListener {
+	l := &muxListener{
+		base:       listener,
+		acceptChan: make(chan net.Conn),
+		closeChan:  make(chan struct{}),
+		deleteFunc: deleteFunc,
+	}
+	go l.acceptLoop()
+	go l.mainLoop()
+	return l
+}
+
+type muxListener struct {
+	lock      sync.Mutex
+	base      net.Listener
+	acceptErr error
+
+	acceptChan chan net.Conn
+	closeChan  chan struct{}
+
+	socksListener *subListener
+	httpListener  *subListener
+
+	deleteFunc func()
+}
+
+func (l *muxListener) acceptLoop() {
+	defer close(l.acceptChan)
+
+	for {
+		conn, err := l.base.Accept()
+		if err != nil {
+			l.lock.Lock()
+			l.acceptErr = err
+			l.lock.Unlock()
+			return
+		}
+		select {
+		case <-l.closeChan:
+			return
+		case l.acceptChan <- conn:
+		}
+	}
+}
+
+func (l *muxListener) mainLoop() {
+	defer func() {
+		l.deleteFunc()
+		l.base.Close()
+
+		close(l.closeChan)
+
+		l.lock.Lock()
+		defer l.lock.Unlock()
+
+		if sl := l.httpListener; sl != nil {
+			close(sl.acceptChan)
+			l.httpListener = nil
+		}
+		if sl := l.socksListener; sl != nil {
+			close(sl.acceptChan)
+			l.socksListener = nil
+		}
+	}()
+
+	for {
+		var socksCloseChan, httpCloseChan chan struct{}
+		if l.httpListener != nil {
+			httpCloseChan = l.httpListener.closeChan
+		}
+		if l.socksListener != nil {
+			socksCloseChan = l.socksListener.closeChan
+		}
+		select {
+		case <-l.closeChan:
+			return
+		case conn, ok := <-l.acceptChan:
+			if !ok {
+				return
+			}
+			go l.dispatch(conn)
+		case <-socksCloseChan:
+			l.lock.Lock()
+			if socksCloseChan == l.socksListener.closeChan {
+				// not replaced by another ListenSOCKS()
+				l.socksListener = nil
+			}
+			l.lock.Unlock()
+			if l.checkIdle() {
+				return
+			}
+		case <-httpCloseChan:
+			l.lock.Lock()
+			if httpCloseChan == l.httpListener.closeChan {
+				// not replaced by another ListenHTTP()
+				l.httpListener = nil
+			}
+			l.lock.Unlock()
+			if l.checkIdle() {
+				return
+			}
+		}
+	}
+}
+
+func (l *muxListener) dispatch(conn net.Conn) {
+	var b [1]byte
+	if _, err := io.ReadFull(conn, b[:]); err != nil {
+		conn.Close()
+		return
+	}
+
+	l.lock.Lock()
+	var target *subListener
+	if b[0] == 5 {
+		target = l.socksListener
+	} else {
+		target = l.httpListener
+	}
+	l.lock.Unlock()
+
+	if target == nil {
+		conn.Close()
+		return
+	}
+
+	wconn := &connWithOneByte{Conn: conn, b: b[0]}
+
+	select {
+	case <-target.closeChan:
+	case target.acceptChan <- wconn:
+	}
+}
+
+func (l *muxListener) checkIdle() bool {
+	l.lock.Lock()
+	defer l.lock.Unlock()
+
+	return l.httpListener == nil && l.socksListener == nil
+}
+
+func (l *muxListener) getAndClearAcceptError() error {
+	l.lock.Lock()
+	defer l.lock.Unlock()
+
+	if l.acceptErr == nil {
+		return nil
+	}
+	err := l.acceptErr
+	l.acceptErr = nil
+	return err
+}
+
+func (l *muxListener) ListenHTTP() (net.Listener, error) {
+	l.lock.Lock()
+	defer l.lock.Unlock()
+
+	if l.httpListener != nil {
+		subListenerPendingClosed := false
+		select {
+		case <-l.httpListener.closeChan:
+			subListenerPendingClosed = true
+		default:
+		}
+		if !subListenerPendingClosed {
+			return nil, OpErr{
+				Addr:     l.base.Addr(),
+				Protocol: "http",
+				Op:       "bind-protocol",
+				Err:      ErrProtocolInUse,
+			}
+		}
+		l.httpListener = nil
+	}
+
+	select {
+	case <-l.closeChan:
+		return nil, net.ErrClosed
+	default:
+	}
+
+	sl := newSubListener(l.getAndClearAcceptError, l.base.Addr)
+	l.httpListener = sl
+	return sl, nil
+}
+
+func (l *muxListener) ListenSOCKS() (net.Listener, error) {
+	l.lock.Lock()
+	defer l.lock.Unlock()
+
+	if l.socksListener != nil {
+		subListenerPendingClosed := false
+		select {
+		case <-l.socksListener.closeChan:
+			subListenerPendingClosed = true
+		default:
+		}
+		if !subListenerPendingClosed {
+			return nil, OpErr{
+				Addr:     l.base.Addr(),
+				Protocol: "socks",
+				Op:       "bind-protocol",
+				Err:      ErrProtocolInUse,
+			}
+		}
+		l.socksListener = nil
+	}
+
+	select {
+	case <-l.closeChan:
+		return nil, net.ErrClosed
+	default:
+	}
+
+	sl := newSubListener(l.getAndClearAcceptError, l.base.Addr)
+	l.socksListener = sl
+	return sl, nil
+}
+
+func newSubListener(acceptErrorFunc func() error, addrFunc func() net.Addr) *subListener {
+	return &subListener{
+		acceptChan:      make(chan net.Conn),
+		acceptErrorFunc: acceptErrorFunc,
+		closeChan:       make(chan struct{}),
+		addrFunc:        addrFunc,
+	}
+}
+
+type subListener struct {
+	// receive connections or closure from upstream
+	acceptChan chan net.Conn
+	// get an error of Accept() from upstream
+	acceptErrorFunc func() error
+	// notify upstream that we are closed
+	closeChan chan struct{}
+
+	// Listener.Addr() implementation of base listener
+	addrFunc func() net.Addr
+}
+
+func (l *subListener) Accept() (net.Conn, error) {
+	select {
+	case <-l.closeChan:
+		// closed by ourselves
+		return nil, net.ErrClosed
+	case conn, ok := <-l.acceptChan:
+		if !ok {
+			// closed by upstream
+			if acceptErr := l.acceptErrorFunc(); acceptErr != nil {
+				return nil, acceptErr
+			}
+			return nil, net.ErrClosed
+		}
+		return conn, nil
+	}
+}
+
+func (l *subListener) Addr() net.Addr {
+	return l.addrFunc()
+}
+
+// Close implements net.Listener.Close.
+// Upstream should use close(l.acceptChan) instead.
+func (l *subListener) Close() error {
+	select {
+	case <-l.closeChan:
+		return nil
+	default:
+	}
+	close(l.closeChan)
+	return nil
+}
+
+// connWithOneByte is a net.Conn that returns b for the first read
+// request, then forwards everything else to Conn.
+type connWithOneByte struct {
+	net.Conn
+
+	b     byte
+	bRead bool
+}
+
+func (c *connWithOneByte) Read(bs []byte) (int, error) {
+	if c.bRead {
+		return c.Conn.Read(bs)
+	}
+	if len(bs) == 0 {
+		return 0, nil
+	}
+	c.bRead = true
+	bs[0] = c.b
+	return 1, nil
+}
+
+type OpErr struct {
+	Addr     net.Addr
+	Protocol string
+	Op       string
+	Err      error
+}
+
+func (m OpErr) Error() string {
+	return fmt.Sprintf("mux-listen: %s[%s]: %s: %v", m.Addr, m.Protocol, m.Op, m.Err)
+}
+
+func (m OpErr) Unwrap() error {
+	return m.Err
+}
+
+var ErrProtocolInUse = errors.New("protocol already in use")

app/internal/proxymux/mux_test.go

@@ -0,0 +1,154 @@
+package proxymux
+
+import (
+	"bytes"
+	"net"
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/apernet/hysteria/app/v2/internal/proxymux/internal/mocks"
+
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/mock"
+)
+
+//go:generate mockery
+
+func testMockListener(t *testing.T, connChan <-chan net.Conn) net.Listener {
+	closedChan := make(chan struct{})
+	mockListener := mocks.NewMockListener(t)
+	mockListener.EXPECT().Accept().RunAndReturn(func() (net.Conn, error) {
+		select {
+		case <-closedChan:
+			return nil, net.ErrClosed
+		case conn, ok := <-connChan:
+			if !ok {
+				panic("unexpected closed channel (connChan)")
+			}
+			return conn, nil
+		}
+	})
+	mockListener.EXPECT().Close().RunAndReturn(func() error {
+		select {
+		case <-closedChan:
+		default:
+			close(closedChan)
+		}
+		return nil
+	})
+	return mockListener
+}
+
+func testMockConn(t *testing.T, b []byte) net.Conn {
+	buf := bytes.NewReader(b)
+	isClosed := false
+	mockConn := mocks.NewMockConn(t)
+	mockConn.EXPECT().Read(mock.Anything).RunAndReturn(func(b []byte) (int, error) {
+		if isClosed {
+			return 0, net.ErrClosed
+		}
+		return buf.Read(b)
+	})
+	mockConn.EXPECT().Close().RunAndReturn(func() error {
+		isClosed = true
+		return nil
+	})
+	return mockConn
+}
+
+func TestMuxHTTP(t *testing.T) {
+	connChan := make(chan net.Conn)
+	mockListener := testMockListener(t, connChan)
+	mockConn := testMockConn(t, []byte("CONNECT example.com:443 HTTP/1.1\r\n\r\n"))
+
+	mux := newMuxListener(mockListener, func() {})
+	hl, err := mux.ListenHTTP()
+	if !assert.NoError(t, err) {
+		return
+	}
+	sl, err := mux.ListenSOCKS()
+	if !assert.NoError(t, err) {
+		return
+	}
+
+	connChan <- mockConn
+
+	var socksConn, httpConn net.Conn
+	var socksErr, httpErr error
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+	go func() {
+		socksConn, socksErr = sl.Accept()
+		wg.Done()
+	}()
+	go func() {
+		httpConn, httpErr = hl.Accept()
+		wg.Done()
+	}()
+
+	time.Sleep(time.Second)
+
+	sl.Close()
+	hl.Close()
+
+	wg.Wait()
+
+	assert.Nil(t, socksConn)
+	assert.ErrorIs(t, socksErr, net.ErrClosed)
+	assert.NotNil(t, httpConn)
+	httpConn.Close()
+	assert.NoError(t, httpErr)
+
+	// Wait for muxListener released
+	<-mux.acceptChan
+}
+
+func TestMuxSOCKS(t *testing.T) {
+	connChan := make(chan net.Conn)
+	mockListener := testMockListener(t, connChan)
+	mockConn := testMockConn(t, []byte{0x05, 0x02, 0x00, 0x01}) // SOCKS5 Connect Request: NOAUTH+GSSAPI
+
+	mux := newMuxListener(mockListener, func() {})
+	hl, err := mux.ListenHTTP()
+	if !assert.NoError(t, err) {
+		return
+	}
+	sl, err := mux.ListenSOCKS()
+	if !assert.NoError(t, err) {
+		return
+	}
+
+	connChan <- mockConn
+
+	var socksConn, httpConn net.Conn
+	var socksErr, httpErr error
+
+	var wg sync.WaitGroup
+	wg.Add(2)
+	go func() {
+		socksConn, socksErr = sl.Accept()
+		wg.Done()
+	}()
+	go func() {
+		httpConn, httpErr = hl.Accept()
+		wg.Done()
+	}()
+
+	time.Sleep(time.Second)
+
+	sl.Close()
+	hl.Close()
+
+	wg.Wait()
+
+	assert.NotNil(t, socksConn)
+	socksConn.Close()
+	assert.NoError(t, socksErr)
+	assert.Nil(t, httpConn)
+	assert.ErrorIs(t, httpErr, net.ErrClosed)
+
+	// Wait for muxListener released
+	<-mux.acceptChan
+}

app/internal/redirect/getsockopt_linux.go

@@ -0,0 +1,17 @@
+//go:build !386
+// +build !386
+
+package redirect
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+func getsockopt(s, level, name uintptr, val unsafe.Pointer, vallen *uint32) (err error) {
+	_, _, e := syscall.Syscall6(syscall.SYS_GETSOCKOPT, s, level, name, uintptr(val), uintptr(unsafe.Pointer(vallen)), 0)
+	if e != 0 {
+		err = e
+	}
+	return
+}

app/internal/redirect/getsockopt_linux_386.go

@@ -0,0 +1,23 @@
+package redirect
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+const (
+	sysGetsockopt = 15
+)
+
+// On 386 we cannot call socketcall with syscall.Syscall6, as it always fails with EFAULT.
+// Use our own syscall.socketcall hack instead.
+
+func syscall_socketcall(call int, a0, a1, a2, a3, a4, a5 uintptr) (n int, err syscall.Errno)
+
+func getsockopt(s, level, name uintptr, val unsafe.Pointer, vallen *uint32) (err error) {
+	_, e := syscall_socketcall(sysGetsockopt, s, level, name, uintptr(val), uintptr(unsafe.Pointer(vallen)), 0)
+	if e != 0 {
+		err = e
+	}
+	return
+}

app/internal/redirect/syscall_socketcall_linux_386.s

@@ -0,0 +1,7 @@
+//go:build gc
+// +build gc
+
+#include "textflag.h"
+
+TEXT ·syscall_socketcall(SB),NOSPLIT,$0-36
+	JMP	syscall·socketcall(SB)

app/internal/redirect/tcp_linux.go

@@ -0,0 +1,126 @@
+package redirect
+
+import (
+	"encoding/binary"
+	"errors"
+	"io"
+	"net"
+	"syscall"
+	"unsafe"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+const (
+	soOriginalDst   = 80
+	soOriginalDstV6 = 80
+)
+
+type TCPRedirect struct {
+	HyClient    client.Client
+	EventLogger TCPEventLogger
+}
+
+type TCPEventLogger interface {
+	Connect(addr, reqAddr net.Addr)
+	Error(addr, reqAddr net.Addr, err error)
+}
+
+func (r *TCPRedirect) ListenAndServe(laddr *net.TCPAddr) error {
+	listener, err := net.ListenTCP("tcp", laddr)
+	if err != nil {
+		return err
+	}
+	defer listener.Close()
+	for {
+		c, err := listener.AcceptTCP()
+		if err != nil {
+			return err
+		}
+		go r.handle(c)
+	}
+}
+
+func (r *TCPRedirect) handle(conn *net.TCPConn) {
+	defer conn.Close()
+	dstAddr, err := getDstAddr(conn)
+	if err != nil {
+		// Fail silently if we can't get the original destination.
+		// Maybe we should print something to the log?
+		return
+	}
+	if r.EventLogger != nil {
+		r.EventLogger.Connect(conn.RemoteAddr(), dstAddr)
+	}
+	var closeErr error
+	defer func() {
+		if r.EventLogger != nil {
+			r.EventLogger.Error(conn.RemoteAddr(), dstAddr, closeErr)
+		}
+	}()
+
+	rc, err := r.HyClient.TCP(dstAddr.String())
+	if err != nil {
+		closeErr = err
+		return
+	}
+	defer rc.Close()
+
+	// Start forwarding
+	copyErrChan := make(chan error, 2)
+	go func() {
+		_, copyErr := io.Copy(rc, conn)
+		copyErrChan <- copyErr
+	}()
+	go func() {
+		_, copyErr := io.Copy(conn, rc)
+		copyErrChan <- copyErr
+	}()
+	closeErr = <-copyErrChan
+}
+
+type sockAddr struct {
+	family uint16
+	port   [2]byte  // always big endian regardless of platform
+	data   [24]byte // sockaddr_in or sockaddr_in6
+}
+
+func getOriginalDst(fd uintptr) (*sockAddr, error) {
+	var addr sockAddr
+	addrSize := uint32(unsafe.Sizeof(addr))
+	// Try IPv6 first
+	err := getsockopt(fd, syscall.SOL_IPV6, soOriginalDstV6, unsafe.Pointer(&addr), &addrSize)
+	if err == nil {
+		return &addr, nil
+	}
+	// Then IPv4
+	err = getsockopt(fd, syscall.SOL_IP, soOriginalDst, unsafe.Pointer(&addr), &addrSize)
+	return &addr, err
+}
+
+// getDstAddr returns the original destination of a redirected TCP connection.
+func getDstAddr(conn *net.TCPConn) (*net.TCPAddr, error) {
+	rc, err := conn.SyscallConn()
+	if err != nil {
+		return nil, err
+	}
+	var addr *sockAddr
+	var err2 error
+	err = rc.Control(func(fd uintptr) {
+		addr, err2 = getOriginalDst(fd)
+	})
+	if err != nil {
+		return nil, err
+	}
+	if err2 != nil {
+		return nil, err2
+	}
+	switch addr.family {
+	case syscall.AF_INET:
+		return &net.TCPAddr{IP: addr.data[:4], Port: int(binary.BigEndian.Uint16(addr.port[:]))}, nil
+	case syscall.AF_INET6:
+		return &net.TCPAddr{IP: addr.data[4:20], Port: int(binary.BigEndian.Uint16(addr.port[:]))}, nil
+	default:
+		return nil, errors.New("address family not IPv4 or IPv6")
+	}
+}

app/internal/redirect/tcp_others.go

@@ -0,0 +1,24 @@
+//go:build !linux
+
+package redirect
+
+import (
+	"errors"
+	"net"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+type TCPRedirect struct {
+	HyClient    client.Client
+	EventLogger TCPEventLogger
+}
+
+type TCPEventLogger interface {
+	Connect(addr, reqAddr net.Addr)
+	Error(addr, reqAddr net.Addr, err error)
+}
+
+func (r *TCPRedirect) ListenAndServe(laddr *net.TCPAddr) error {
+	return errors.New("not supported on this platform")
+}

app/internal/sockopts/fd_control_unix_socket_test.py

@@ -0,0 +1,65 @@
+import socket
+import array
+import os
+import struct
+import sys
+
+
+def serve(path):
+    try:
+        os.unlink(path)
+    except OSError:
+        if os.path.exists(path):
+            raise
+
+    server = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+    server.bind(path)
+    server.listen()
+    print(f"Listening on {path}")
+
+    try:
+        while True:
+            connection, client_address = server.accept()
+            print(f"Client connected")
+
+            try:
+                # Receiving fd from client
+                fds = array.array("i")
+                msg, ancdata, flags, addr = connection.recvmsg(1, socket.CMSG_LEN(struct.calcsize('i')))
+                for cmsg_level, cmsg_type, cmsg_data in ancdata:
+                    if cmsg_level == socket.SOL_SOCKET and cmsg_type == socket.SCM_RIGHTS:
+                        fds.frombytes(cmsg_data[:len(cmsg_data) - (len(cmsg_data) % fds.itemsize)])
+
+                fd = fds[0]
+
+                # We make a call to setsockopt(2) here, so client can verify we have received the fd
+                # In the real scenario, the server would set things like SO_MARK,
+                # we use SO_RCVBUF as it doesn't require any special capabilities.
+                nbytes = struct.pack("i", 2500)
+                fdsocket = fd_to_socket(fd)
+                fdsocket.setsockopt(socket.SOL_SOCKET, socket.SO_RCVBUF, nbytes)
+                fdsocket.close()
+
+                # The only protocol-like thing specified in the client implementation.
+                connection.send(b'\x01')
+            finally:
+                connection.close()
+                print("Connection closed")
+
+    except KeyboardInterrupt:
+        print("Exit")
+
+    finally:
+        server.close()
+        os.unlink(path)
+
+
+def fd_to_socket(fd):
+    return socket.fromfd(fd, socket.AF_UNIX, socket.SOCK_STREAM)
+
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        raise ValueError("unix socket path is required")
+
+    serve(sys.argv[1])

app/internal/sockopts/sockopts.go

@@ -0,0 +1,76 @@
+package sockopts
+
+import (
+	"fmt"
+	"net"
+)
+
+type SocketOptions struct {
+	BindInterface       *string
+	FirewallMark        *uint32
+	FdControlUnixSocket *string
+}
+
+// implemented in platform-specific files
+var (
+	bindInterfaceFunc       func(c *net.UDPConn, device string) error
+	firewallMarkFunc        func(c *net.UDPConn, fwmark uint32) error
+	fdControlUnixSocketFunc func(c *net.UDPConn, path string) error
+)
+
+func (o *SocketOptions) CheckSupported() (err error) {
+	if o.BindInterface != nil && bindInterfaceFunc == nil {
+		return &UnsupportedError{"bindInterface"}
+	}
+	if o.FirewallMark != nil && firewallMarkFunc == nil {
+		return &UnsupportedError{"fwmark"}
+	}
+	if o.FdControlUnixSocket != nil && fdControlUnixSocketFunc == nil {
+		return &UnsupportedError{"fdControlUnixSocket"}
+	}
+	return nil
+}
+
+type UnsupportedError struct {
+	Field string
+}
+
+func (e *UnsupportedError) Error() string {
+	return fmt.Sprintf("%s is not supported on this platform", e.Field)
+}
+
+func (o *SocketOptions) ListenUDP() (uconn net.PacketConn, err error) {
+	uconn, err = net.ListenUDP("udp", nil)
+	if err != nil {
+		return
+	}
+	err = o.applyToUDPConn(uconn.(*net.UDPConn))
+	if err != nil {
+		uconn.Close()
+		uconn = nil
+		return
+	}
+	return
+}
+
+func (o *SocketOptions) applyToUDPConn(c *net.UDPConn) error {
+	if o.BindInterface != nil && bindInterfaceFunc != nil {
+		err := bindInterfaceFunc(c, *o.BindInterface)
+		if err != nil {
+			return fmt.Errorf("failed to bind to interface: %w", err)
+		}
+	}
+	if o.FirewallMark != nil && firewallMarkFunc != nil {
+		err := firewallMarkFunc(c, *o.FirewallMark)
+		if err != nil {
+			return fmt.Errorf("failed to set fwmark: %w", err)
+		}
+	}
+	if o.FdControlUnixSocket != nil && fdControlUnixSocketFunc != nil {
+		err := fdControlUnixSocketFunc(c, *o.FdControlUnixSocket)
+		if err != nil {
+			return fmt.Errorf("failed to send fd to control unix socket: %w", err)
+		}
+	}
+	return nil
+}

app/internal/sockopts/sockopts_linux.go

@@ -0,0 +1,96 @@
+//go:build linux
+
+package sockopts
+
+import (
+	"fmt"
+	"net"
+	"time"
+
+	"golang.org/x/exp/constraints"
+	"golang.org/x/sys/unix"
+)
+
+const (
+	fdControlUnixTimeout = 3 * time.Second
+)
+
+func init() {
+	bindInterfaceFunc = bindInterfaceImpl
+	firewallMarkFunc = firewallMarkImpl
+	fdControlUnixSocketFunc = fdControlUnixSocketImpl
+}
+
+func controlUDPConn(c *net.UDPConn, cb func(fd int) error) (err error) {
+	rconn, err := c.SyscallConn()
+	if err != nil {
+		return
+	}
+	cerr := rconn.Control(func(fd uintptr) {
+		err = cb(int(fd))
+	})
+	if err != nil {
+		return
+	}
+	if cerr != nil {
+		err = fmt.Errorf("failed to control fd: %w", cerr)
+		return
+	}
+	return
+}
+
+func bindInterfaceImpl(c *net.UDPConn, device string) error {
+	return controlUDPConn(c, func(fd int) error {
+		return unix.BindToDevice(fd, device)
+	})
+}
+
+func firewallMarkImpl(c *net.UDPConn, fwmark uint32) error {
+	return controlUDPConn(c, func(fd int) error {
+		return unix.SetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_MARK, int(fwmark))
+	})
+}
+
+func fdControlUnixSocketImpl(c *net.UDPConn, path string) error {
+	return controlUDPConn(c, func(fd int) error {
+		socketFd, err := unix.Socket(unix.AF_UNIX, unix.SOCK_STREAM, 0)
+		if err != nil {
+			return fmt.Errorf("failed to create unix socket: %w", err)
+		}
+		defer unix.Close(socketFd)
+
+		var timeout unix.Timeval
+		timeUsec := fdControlUnixTimeout.Microseconds()
+		castAssignInteger(timeUsec/1e6, &timeout.Sec)
+		// Specifying the type explicitly is not necessary here, but it makes GoLand happy.
+		castAssignInteger[int64](timeUsec%1e6, &timeout.Usec)
+
+		_ = unix.SetsockoptTimeval(socketFd, unix.SOL_SOCKET, unix.SO_RCVTIMEO, &timeout)
+		_ = unix.SetsockoptTimeval(socketFd, unix.SOL_SOCKET, unix.SO_SNDTIMEO, &timeout)
+
+		err = unix.Connect(socketFd, &unix.SockaddrUnix{Name: path})
+		if err != nil {
+			return fmt.Errorf("failed to connect: %w", err)
+		}
+
+		err = unix.Sendmsg(socketFd, nil, unix.UnixRights(fd), nil, 0)
+		if err != nil {
+			return fmt.Errorf("failed to send: %w", err)
+		}
+
+		dummy := []byte{1}
+		n, err := unix.Read(socketFd, dummy)
+		if err != nil {
+			return fmt.Errorf("failed to receive: %w", err)
+		}
+		if n != 1 {
+			return fmt.Errorf("socket closed unexpectedly")
+		}
+
+		return nil
+	})
+}
+
+func castAssignInteger[F, T constraints.Integer](from F, to *T) {
+	*to = T(from)
+}

app/internal/sockopts/sockopts_linux_test.go

@@ -0,0 +1,53 @@
+//go:build linux
+
+package sockopts
+
+import (
+	"net"
+	"os"
+	"os/exec"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+	"golang.org/x/sys/unix"
+)
+
+func Test_fdControlUnixSocketImpl(t *testing.T) {
+	sockPath := "./fd_control_unix_socket_test.sock"
+	defer os.Remove(sockPath)
+
+	// Run test server
+	cmd := exec.Command("python", "fd_control_unix_socket_test.py", sockPath)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	err := cmd.Start()
+	if !assert.NoError(t, err) {
+		return
+	}
+	defer cmd.Process.Kill()
+
+	// Wait for the server to start
+	time.Sleep(1 * time.Second)
+
+	so := SocketOptions{
+		FdControlUnixSocket: &sockPath,
+	}
+	conn, err := so.ListenUDP()
+	if !assert.NoError(t, err) {
+		return
+	}
+	defer conn.Close()
+
+	err = controlUDPConn(conn.(*net.UDPConn), func(fd int) (err error) {
+		rcvbuf, err := unix.GetsockoptInt(fd, unix.SOL_SOCKET, unix.SO_RCVBUF)
+		if err != nil {
+			return
+		}
+		// The test server called setsockopt(fd, SOL_SOCKET, SO_RCVBUF, 2500),
+		// and kernel will double this value for getsockopt().
+		assert.Equal(t, 5000, rcvbuf)
+		return
+	})
+	assert.NoError(t, err)
+}

app/internal/socks5/server.go

@@ -0,0 +1,300 @@
+package socks5
+
+import (
+	"encoding/binary"
+	"io"
+	"net"
+
+	"github.com/txthinking/socks5"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+const udpBufferSize = 4096
+
+// Server is a SOCKS5 server using a Hysteria client as outbound.
+type Server struct {
+	HyClient    client.Client
+	AuthFunc    func(username, password string) bool // nil = no authentication
+	DisableUDP  bool
+	EventLogger EventLogger
+}
+
+type EventLogger interface {
+	TCPRequest(addr net.Addr, reqAddr string)
+	TCPError(addr net.Addr, reqAddr string, err error)
+	UDPRequest(addr net.Addr)
+	UDPError(addr net.Addr, err error)
+}
+
+func (s *Server) Serve(listener net.Listener) error {
+	for {
+		conn, err := listener.Accept()
+		if err != nil {
+			return err
+		}
+		go s.dispatch(conn)
+	}
+}
+
+func (s *Server) dispatch(conn net.Conn) {
+	ok, _ := s.negotiate(conn)
+	if !ok {
+		_ = conn.Close()
+		return
+	}
+	// Negotiation ok, get and handle the request
+	req, err := socks5.NewRequestFrom(conn)
+	if err != nil {
+		_ = conn.Close()
+		return
+	}
+	switch req.Cmd {
+	case socks5.CmdConnect: // TCP
+		s.handleTCP(conn, req)
+	case socks5.CmdUDP: // UDP
+		if s.DisableUDP {
+			_ = sendSimpleReply(conn, socks5.RepCommandNotSupported)
+			_ = conn.Close()
+			return
+		}
+		s.handleUDP(conn, req)
+	default:
+		_ = sendSimpleReply(conn, socks5.RepCommandNotSupported)
+		_ = conn.Close()
+	}
+}
+
+func (s *Server) negotiate(conn net.Conn) (bool, error) {
+	req, err := socks5.NewNegotiationRequestFrom(conn)
+	if err != nil {
+		return false, err
+	}
+	var serverMethod byte
+	if s.AuthFunc != nil {
+		serverMethod = socks5.MethodUsernamePassword
+	} else {
+		serverMethod = socks5.MethodNone
+	}
+	// Look for the supported method in the client request
+	supported := false
+	for _, m := range req.Methods {
+		if m == serverMethod {
+			supported = true
+			break
+		}
+	}
+	if !supported {
+		// No supported method found, reject the client
+		rep := socks5.NewNegotiationReply(socks5.MethodUnsupportAll)
+		_, err := rep.WriteTo(conn)
+		return false, err
+	}
+	// OK, send the method we chose
+	rep := socks5.NewNegotiationReply(serverMethod)
+	_, err = rep.WriteTo(conn)
+	if err != nil {
+		return false, err
+	}
+	// If we chose the username/password method, authenticate the client
+	if serverMethod == socks5.MethodUsernamePassword {
+		req, err := socks5.NewUserPassNegotiationRequestFrom(conn)
+		if err != nil {
+			return false, err
+		}
+		ok := s.AuthFunc(string(req.Uname), string(req.Passwd))
+		if ok {
+			rep := socks5.NewUserPassNegotiationReply(socks5.UserPassStatusSuccess)
+			_, err := rep.WriteTo(conn)
+			if err != nil {
+				return false, err
+			}
+		} else {
+			rep := socks5.NewUserPassNegotiationReply(socks5.UserPassStatusFailure)
+			_, err := rep.WriteTo(conn)
+			return false, err
+		}
+	}
+	return true, nil
+}
+
+func (s *Server) handleTCP(conn net.Conn, req *socks5.Request) {
+	defer conn.Close()
+
+	addr := req.Address()
+
+	// TCP request & error log
+	if s.EventLogger != nil {
+		s.EventLogger.TCPRequest(conn.RemoteAddr(), addr)
+	}
+	var closeErr error
+	defer func() {
+		if s.EventLogger != nil {
+			s.EventLogger.TCPError(conn.RemoteAddr(), addr, closeErr)
+		}
+	}()
+
+	// Dial
+	rConn, err := s.HyClient.TCP(addr)
+	if err != nil {
+		_ = sendSimpleReply(conn, socks5.RepHostUnreachable)
+		closeErr = err
+		return
+	}
+	defer rConn.Close()
+
+	// Send reply and start relaying
+	_ = sendSimpleReply(conn, socks5.RepSuccess)
+	copyErrChan := make(chan error, 2)
+	go func() {
+		_, err := io.Copy(rConn, conn)
+		copyErrChan <- err
+	}()
+	go func() {
+		_, err := io.Copy(conn, rConn)
+		copyErrChan <- err
+	}()
+	closeErr = <-copyErrChan
+}
+
+func (s *Server) handleUDP(conn net.Conn, req *socks5.Request) {
+	defer conn.Close()
+
+	// UDP request & error log
+	if s.EventLogger != nil {
+		s.EventLogger.UDPRequest(conn.RemoteAddr())
+	}
+	var closeErr error
+	defer func() {
+		if s.EventLogger != nil {
+			s.EventLogger.UDPError(conn.RemoteAddr(), closeErr)
+		}
+	}()
+
+	// Start UDP relay server
+	// SOCKS5 UDP requires the server to return the UDP bind address and port in the reply.
+	// We bind to the same address that our TCP server listens on (but a different port).
+	host, _, err := net.SplitHostPort(conn.LocalAddr().String())
+	if err != nil {
+		// Is this even possible?
+		_ = sendSimpleReply(conn, socks5.RepServerFailure)
+		closeErr = err
+		return
+	}
+	udpAddr, err := net.ResolveUDPAddr("udp", net.JoinHostPort(host, "0"))
+	if err != nil {
+		_ = sendSimpleReply(conn, socks5.RepServerFailure)
+		closeErr = err
+		return
+	}
+	udpConn, err := net.ListenUDP("udp", udpAddr)
+	if err != nil {
+		_ = sendSimpleReply(conn, socks5.RepServerFailure)
+		closeErr = err
+		return
+	}
+	defer udpConn.Close()
+
+	// HyClient UDP session
+	hyUDP, err := s.HyClient.UDP()
+	if err != nil {
+		_ = sendSimpleReply(conn, socks5.RepServerFailure)
+		closeErr = err
+		return
+	}
+	defer hyUDP.Close()
+
+	// Send reply
+	_ = sendUDPReply(conn, udpConn.LocalAddr().(*net.UDPAddr))
+
+	// UDP relay & SOCKS5 connection holder
+	errChan := make(chan error, 2)
+	go func() {
+		err := s.udpServer(udpConn, hyUDP)
+		errChan <- err
+	}()
+	go func() {
+		_, err := io.Copy(io.Discard, conn)
+		errChan <- err
+	}()
+	closeErr = <-errChan
+}
+
+func (s *Server) udpServer(udpConn *net.UDPConn, hyUDP client.HyUDPConn) error {
+	var clientAddr *net.UDPAddr
+	buf := make([]byte, udpBufferSize)
+	// local -> remote
+	for {
+		n, cAddr, err := udpConn.ReadFromUDP(buf)
+		if err != nil {
+			return err
+		}
+		d, err := socks5.NewDatagramFromBytes(buf[:n])
+		if err != nil || d.Frag != 0 {
+			// Ignore bad packets
+			// Also we don't support SOCKS5 UDP fragmentation for now
+			continue
+		}
+		if clientAddr == nil {
+			// Before the first packet, we don't know what IP the client will use to send us packets,
+			// so we don't know what IP to return packets to.
+			// We treat whoever sends us the first packet as our client.
+			clientAddr = cAddr
+			// Now that we know the client's address, we can start the
+			// remote -> local direction.
+			go func() {
+				for {
+					bs, from, err := hyUDP.Receive()
+					if err != nil {
+						// Close the UDP conn so that the local -> remote direction will exit
+						_ = udpConn.Close()
+						return
+					}
+					atyp, addr, port, err := socks5.ParseAddress(from)
+					if err != nil {
+						continue
+					}
+					if atyp == socks5.ATYPDomain {
+						// socks5.ParseAddress adds a leading byte for domains,
+						// but socks5.NewDatagram will add it again as it expects a raw domain.
+						// So we must remove it here.
+						addr = addr[1:]
+					}
+					d := socks5.NewDatagram(atyp, addr, port, bs)
+					_, _ = udpConn.WriteToUDP(d.Bytes(), clientAddr)
+				}
+			}()
+		} else if !clientAddr.IP.Equal(cAddr.IP) || clientAddr.Port != cAddr.Port {
+			// Not our client, ignore
+			continue
+		}
+		// Send to remote
+		_ = hyUDP.Send(d.Data, d.Address())
+	}
+}
+
+// sendSimpleReply sends a SOCKS5 reply with the given reply code.
+// It does not contain bind address or port, so it's not suitable for successful UDP requests.
+func sendSimpleReply(conn net.Conn, rep byte) error {
+	p := socks5.NewReply(rep, socks5.ATYPIPv4, []byte{0x00, 0x00, 0x00, 0x00}, []byte{0x00, 0x00})
+	_, err := p.WriteTo(conn)
+	return err
+}
+
+// sendUDPReply sends a SOCKS5 reply with the given reply code and bind address/port.
+func sendUDPReply(conn net.Conn, addr *net.UDPAddr) error {
+	var atyp byte
+	var bndAddr, bndPort []byte
+	if ip4 := addr.IP.To4(); ip4 != nil {
+		atyp = socks5.ATYPIPv4
+		bndAddr = ip4
+	} else {
+		atyp = socks5.ATYPIPv6
+		bndAddr = addr.IP
+	}
+	bndPort = make([]byte, 2)
+	binary.BigEndian.PutUint16(bndPort, uint16(addr.Port))
+	p := socks5.NewReply(socks5.RepSuccess, atyp, bndAddr, bndPort)
+	_, err := p.WriteTo(conn)
+	return err
+}

app/internal/socks5/server_test.go

@@ -0,0 +1,29 @@
+package socks5
+
+import (
+	"net"
+	"os/exec"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+
+	"github.com/apernet/hysteria/app/v2/internal/utils_test"
+)
+
+func TestServer(t *testing.T) {
+	// Start the server
+	l, err := net.Listen("tcp", "127.0.0.1:11080")
+	assert.NoError(t, err)
+	defer l.Close()
+	s := &Server{
+		HyClient: &utils_test.MockEchoHyClient{},
+	}
+	go s.Serve(l)
+
+	// Run the Python test script
+	cmd := exec.Command("python", "server_test.py")
+	out, err := cmd.CombinedOutput()
+	assert.NoError(t, err)
+	assert.Equal(t, "OK", strings.TrimSpace(string(out)))
+}

app/internal/socks5/server_test.py

@@ -0,0 +1,57 @@
+import socket
+import socks
+import os
+
+ADDR = "127.0.0.1"
+PORT = 11080
+
+
+def test_tcp(size, count, it, domain=False):
+    for i in range(it):
+        s = socks.socksocket(socket.AF_INET, socket.SOCK_STREAM)
+        s.set_proxy(socks.SOCKS5, ADDR, PORT)
+
+        if domain:
+            s.connect(("test.tcp.com", 12345))
+        else:
+            s.connect(("1.2.3.4", 12345))
+
+        for j in range(count):
+            payload = os.urandom(size)
+            s.send(payload)
+            rsp = s.recv(size)
+            assert rsp == payload
+
+        s.close()
+
+
+def test_udp(size, count, it, domain=False):
+    for i in range(it):
+        s = socks.socksocket(socket.AF_INET, socket.SOCK_DGRAM)
+        s.set_proxy(socks.SOCKS5, ADDR, PORT)
+
+        for j in range(count):
+            payload = os.urandom(size)
+
+            if domain:
+                s.sendto(payload, ("test.udp.com", 12345))
+            else:
+                s.sendto(payload, ("1.2.3.4", 12345))
+
+            rsp, addr = s.recvfrom(size)
+            assert rsp == payload
+
+            if domain:
+                assert addr == (b"test.udp.com", 12345)
+            else:
+                assert addr == ("1.2.3.4", 12345)
+
+        s.close()
+
+
+if __name__ == "__main__":
+    test_tcp(1024, 1024, 10, domain=False)
+    test_tcp(1024, 1024, 10, domain=True)
+    test_udp(1024, 1024, 10, domain=False)
+    test_udp(1024, 1024, 10, domain=True)
+    print("OK")

app/internal/tproxy/tcp_linux.go

@@ -0,0 +1,69 @@
+package tproxy
+
+import (
+	"io"
+	"net"
+
+	"github.com/apernet/go-tproxy"
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+type TCPTProxy struct {
+	HyClient    client.Client
+	EventLogger TCPEventLogger
+}
+
+type TCPEventLogger interface {
+	Connect(addr, reqAddr net.Addr)
+	Error(addr, reqAddr net.Addr, err error)
+}
+
+func (r *TCPTProxy) ListenAndServe(laddr *net.TCPAddr) error {
+	listener, err := tproxy.ListenTCP("tcp", laddr)
+	if err != nil {
+		return err
+	}
+	defer listener.Close()
+	for {
+		c, err := listener.Accept()
+		if err != nil {
+			return err
+		}
+		go r.handle(c)
+	}
+}
+
+func (r *TCPTProxy) handle(conn net.Conn) {
+	defer conn.Close()
+	// In TProxy mode, we are masquerading as the remote server.
+	// So LocalAddr is actually the target the user is trying to connect to,
+	// and RemoteAddr is the local address.
+	if r.EventLogger != nil {
+		r.EventLogger.Connect(conn.RemoteAddr(), conn.LocalAddr())
+	}
+	var closeErr error
+	defer func() {
+		if r.EventLogger != nil {
+			r.EventLogger.Error(conn.RemoteAddr(), conn.LocalAddr(), closeErr)
+		}
+	}()
+
+	rc, err := r.HyClient.TCP(conn.LocalAddr().String())
+	if err != nil {
+		closeErr = err
+		return
+	}
+	defer rc.Close()
+
+	// Start forwarding
+	copyErrChan := make(chan error, 2)
+	go func() {
+		_, copyErr := io.Copy(rc, conn)
+		copyErrChan <- copyErr
+	}()
+	go func() {
+		_, copyErr := io.Copy(conn, rc)
+		copyErrChan <- copyErr
+	}()
+	closeErr = <-copyErrChan
+}

app/internal/tproxy/tcp_others.go

@@ -0,0 +1,24 @@
+//go:build !linux
+
+package tproxy
+
+import (
+	"errors"
+	"net"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+type TCPTProxy struct {
+	HyClient    client.Client
+	EventLogger TCPEventLogger
+}
+
+type TCPEventLogger interface {
+	Connect(addr, reqAddr net.Addr)
+	Error(addr, reqAddr net.Addr, err error)
+}
+
+func (r *TCPTProxy) ListenAndServe(laddr *net.TCPAddr) error {
+	return errors.New("not supported on this platform")
+}

app/internal/tproxy/udp_linux.go

@@ -0,0 +1,140 @@
+package tproxy
+
+import (
+	"errors"
+	"net"
+	"time"
+
+	"github.com/apernet/go-tproxy"
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+const (
+	udpBufferSize  = 4096
+	defaultTimeout = 60 * time.Second
+)
+
+type UDPTProxy struct {
+	HyClient    client.Client
+	Timeout     time.Duration
+	EventLogger UDPEventLogger
+}
+
+type UDPEventLogger interface {
+	Connect(addr, reqAddr net.Addr)
+	Error(addr, reqAddr net.Addr, err error)
+}
+
+func (r *UDPTProxy) ListenAndServe(laddr *net.UDPAddr) error {
+	conn, err := tproxy.ListenUDP("udp", laddr)
+	if err != nil {
+		return err
+	}
+	defer conn.Close()
+	buf := make([]byte, udpBufferSize)
+	for {
+		// We will only get the first packet of each src/dst pair here,
+		// because newPair will create a TProxy connection and take over
+		// the src/dst pair. Later packets will be sent there instead of here.
+		n, srcAddr, dstAddr, err := tproxy.ReadFromUDP(conn, buf)
+		if err != nil {
+			return err
+		}
+		r.newPair(srcAddr, dstAddr, buf[:n])
+	}
+}
+
+func (r *UDPTProxy) newPair(srcAddr, dstAddr *net.UDPAddr, initPkt []byte) {
+	if r.EventLogger != nil {
+		r.EventLogger.Connect(srcAddr, dstAddr)
+	}
+	var closeErr error
+	defer func() {
+		// If closeErr is nil, it means we at least successfully sent the first packet
+		// and started forwarding, in which case we don't call the error logger.
+		if r.EventLogger != nil && closeErr != nil {
+			r.EventLogger.Error(srcAddr, dstAddr, closeErr)
+		}
+	}()
+	conn, err := tproxy.DialUDP("udp", dstAddr, srcAddr)
+	if err != nil {
+		closeErr = err
+		return
+	}
+	hyConn, err := r.HyClient.UDP()
+	if err != nil {
+		_ = conn.Close()
+		closeErr = err
+		return
+	}
+	// Send the first packet
+	err = hyConn.Send(initPkt, dstAddr.String())
+	if err != nil {
+		_ = conn.Close()
+		_ = hyConn.Close()
+		closeErr = err
+		return
+	}
+	// Start forwarding
+	go func() {
+		err := r.forwarding(conn, hyConn, dstAddr.String())
+		_ = conn.Close()
+		_ = hyConn.Close()
+		if r.EventLogger != nil {
+			var netErr net.Error
+			if errors.As(err, &netErr) && netErr.Timeout() {
+				// We don't consider deadline exceeded (timeout) an error
+				err = nil
+			}
+			r.EventLogger.Error(srcAddr, dstAddr, err)
+		}
+	}()
+}
+
+func (r *UDPTProxy) forwarding(conn *net.UDPConn, hyConn client.HyUDPConn, dst string) error {
+	errChan := make(chan error, 2)
+	// Local <- Remote
+	go func() {
+		for {
+			bs, _, err := hyConn.Receive()
+			if err != nil {
+				errChan <- err
+				return
+			}
+			_, err = conn.Write(bs)
+			if err != nil {
+				errChan <- err
+				return
+			}
+			_ = r.updateConnDeadline(conn)
+		}
+	}()
+	// Local -> Remote
+	go func() {
+		buf := make([]byte, udpBufferSize)
+		for {
+			_ = r.updateConnDeadline(conn)
+			n, err := conn.Read(buf)
+			if n > 0 {
+				err := hyConn.Send(buf[:n], dst)
+				if err != nil {
+					errChan <- err
+					return
+				}
+			}
+			if err != nil {
+				errChan <- err
+				return
+			}
+		}
+	}()
+	return <-errChan
+}
+
+func (r *UDPTProxy) updateConnDeadline(conn *net.UDPConn) error {
+	if r.Timeout == 0 {
+		return conn.SetReadDeadline(time.Now().Add(defaultTimeout))
+	} else {
+		return conn.SetReadDeadline(time.Now().Add(r.Timeout))
+	}
+}

app/internal/tproxy/udp_others.go

@@ -0,0 +1,26 @@
+//go:build !linux
+
+package tproxy
+
+import (
+	"errors"
+	"net"
+	"time"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+type UDPTProxy struct {
+	HyClient    client.Client
+	Timeout     time.Duration
+	EventLogger UDPEventLogger
+}
+
+type UDPEventLogger interface {
+	Connect(addr, reqAddr net.Addr)
+	Error(addr, reqAddr net.Addr, err error)
+}
+
+func (r *UDPTProxy) ListenAndServe(laddr *net.UDPAddr) error {
+	return errors.New("not supported on this platform")
+}

app/internal/tun/check_ipv6_others.go

@@ -0,0 +1,14 @@
+//go:build !unix && !windows
+
+package tun
+
+import "net"
+
+func isIPv6Supported() bool {
+	lis, err := net.ListenPacket("udp6", "[::1]:0")
+	if err != nil {
+		return false
+	}
+	_ = lis.Close()
+	return true
+}

app/internal/tun/check_ipv6_unix.go

@@ -0,0 +1,16 @@
+//go:build unix
+
+package tun
+
+import (
+	"golang.org/x/sys/unix"
+)
+
+func isIPv6Supported() bool {
+	sock, err := unix.Socket(unix.AF_INET6, unix.SOCK_DGRAM, unix.IPPROTO_UDP)
+	if err != nil {
+		return false
+	}
+	_ = unix.Close(sock)
+	return true
+}

app/internal/tun/check_ipv6_windows.go

@@ -0,0 +1,24 @@
+//go:build windows
+
+package tun
+
+import (
+	"golang.org/x/sys/windows"
+)
+
+func isIPv6Supported() bool {
+	var wsaData windows.WSAData
+	err := windows.WSAStartup(uint32(0x202), &wsaData)
+	if err != nil {
+		// Failing silently: it is not our duty to report such errors
+		return true
+	}
+	defer windows.WSACleanup()
+
+	sock, err := windows.Socket(windows.AF_INET6, windows.SOCK_DGRAM, windows.IPPROTO_UDP)
+	if err != nil {
+		return false
+	}
+	_ = windows.Closesocket(sock)
+	return true
+}

app/internal/tun/log.go

@@ -0,0 +1,77 @@
+package tun
+
+import (
+	"github.com/sagernet/sing/common/logger"
+	"go.uber.org/zap"
+)
+
+var _ logger.Logger = (*singLogger)(nil)
+
+type singLogger struct {
+	tag       string
+	zapLogger *zap.Logger
+}
+
+func extractSingExceptions(args []any) {
+	for i, arg := range args {
+		if err, ok := arg.(error); ok {
+			args[i] = err.Error()
+		}
+	}
+}
+
+func (l *singLogger) Trace(args ...any) {
+	if l.zapLogger == nil {
+		return
+	}
+	extractSingExceptions(args)
+	l.zapLogger.Debug(l.tag, zap.Any("args", args))
+}
+
+func (l *singLogger) Debug(args ...any) {
+	if l.zapLogger == nil {
+		return
+	}
+	extractSingExceptions(args)
+	l.zapLogger.Debug(l.tag, zap.Any("args", args))
+}
+
+func (l *singLogger) Info(args ...any) {
+	if l.zapLogger == nil {
+		return
+	}
+	extractSingExceptions(args)
+	l.zapLogger.Info(l.tag, zap.Any("args", args))
+}
+
+func (l *singLogger) Warn(args ...any) {
+	if l.zapLogger == nil {
+		return
+	}
+	extractSingExceptions(args)
+	l.zapLogger.Warn(l.tag, zap.Any("args", args))
+}
+
+func (l *singLogger) Error(args ...any) {
+	if l.zapLogger == nil {
+		return
+	}
+	extractSingExceptions(args)
+	l.zapLogger.Error(l.tag, zap.Any("args", args))
+}
+
+func (l *singLogger) Fatal(args ...any) {
+	if l.zapLogger == nil {
+		return
+	}
+	extractSingExceptions(args)
+	l.zapLogger.Fatal(l.tag, zap.Any("args", args))
+}
+
+func (l *singLogger) Panic(args ...any) {
+	if l.zapLogger == nil {
+		return
+	}
+	extractSingExceptions(args)
+	l.zapLogger.Panic(l.tag, zap.Any("args", args))
+}

app/internal/tun/server.go

@@ -0,0 +1,234 @@
+package tun
+
+import (
+	"context"
+	"fmt"
+	"io"
+	"net"
+	"net/netip"
+
+	tun "github.com/apernet/sing-tun"
+	"github.com/sagernet/sing/common/buf"
+	"github.com/sagernet/sing/common/control"
+	"github.com/sagernet/sing/common/metadata"
+	"github.com/sagernet/sing/common/network"
+	"go.uber.org/zap"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+type Server struct {
+	HyClient    client.Client
+	EventLogger EventLogger
+
+	// for debugging
+	Logger *zap.Logger
+
+	IfName  string
+	MTU     uint32
+	Timeout int64 // in seconds, also applied to TCP in system stack
+
+	// required by system stack
+	Inet4Address []netip.Prefix
+	Inet6Address []netip.Prefix
+
+	// auto route
+	AutoRoute                bool
+	StructRoute              bool
+	Inet4RouteAddress        []netip.Prefix
+	Inet6RouteAddress        []netip.Prefix
+	Inet4RouteExcludeAddress []netip.Prefix
+	Inet6RouteExcludeAddress []netip.Prefix
+}
+
+type EventLogger interface {
+	TCPRequest(addr, reqAddr string)
+	TCPError(addr, reqAddr string, err error)
+	UDPRequest(addr string)
+	UDPError(addr string, err error)
+}
+
+func (s *Server) Serve() error {
+	if !isIPv6Supported() {
+		s.Logger.Warn("tun-pre-check", zap.String("msg", "IPv6 is not supported or enabled on this system, TUN device is created without IPv6 support."))
+		s.Inet6Address = nil
+	}
+	tunOpts := tun.Options{
+		Name:                     s.IfName,
+		Inet4Address:             s.Inet4Address,
+		Inet6Address:             s.Inet6Address,
+		MTU:                      s.MTU,
+		GSO:                      true,
+		AutoRoute:                s.AutoRoute,
+		StrictRoute:              s.StructRoute,
+		Inet4RouteAddress:        s.Inet4RouteAddress,
+		Inet6RouteAddress:        s.Inet6RouteAddress,
+		Inet4RouteExcludeAddress: s.Inet4RouteExcludeAddress,
+		Inet6RouteExcludeAddress: s.Inet6RouteExcludeAddress,
+		Logger: &singLogger{
+			tag:       "tun",
+			zapLogger: s.Logger,
+		},
+	}
+	tunIf, err := tun.New(tunOpts)
+	if err != nil {
+		return fmt.Errorf("failed to create tun interface: %w", err)
+	}
+	defer tunIf.Close()
+
+	tunStack, err := tun.NewSystem(tun.StackOptions{
+		Context:    context.Background(),
+		Tun:        tunIf,
+		TunOptions: tunOpts,
+		UDPTimeout: s.Timeout,
+		Handler:    &tunHandler{s},
+		Logger: &singLogger{
+			tag:       "tun-stack",
+			zapLogger: s.Logger,
+		},
+		ForwarderBindInterface: true,
+		InterfaceFinder:        &interfaceFinder{},
+	})
+	if err != nil {
+		return fmt.Errorf("failed to create tun stack: %w", err)
+	}
+	defer tunStack.Close()
+	return tunStack.(tun.StackRunner).Run()
+}
+
+type tunHandler struct {
+	*Server
+}
+
+var _ tun.Handler = (*tunHandler)(nil)
+
+func (t *tunHandler) NewConnection(ctx context.Context, conn net.Conn, m metadata.Metadata) error {
+	addr := m.Source.String()
+	reqAddr := m.Destination.String()
+	if t.EventLogger != nil {
+		t.EventLogger.TCPRequest(addr, reqAddr)
+	}
+	var closeErr error
+	defer func() {
+		if t.EventLogger != nil {
+			t.EventLogger.TCPError(addr, reqAddr, closeErr)
+		}
+	}()
+	rc, err := t.HyClient.TCP(reqAddr)
+	if err != nil {
+		closeErr = err
+		// the returned err is ignored by caller
+		return nil
+	}
+	defer rc.Close()
+
+	// start forwarding
+	copyErrChan := make(chan error, 3)
+	go func() {
+		<-ctx.Done()
+		copyErrChan <- ctx.Err()
+	}()
+	go func() {
+		_, copyErr := io.Copy(rc, conn)
+		copyErrChan <- copyErr
+	}()
+	go func() {
+		_, copyErr := io.Copy(conn, rc)
+		copyErrChan <- copyErr
+	}()
+	closeErr = <-copyErrChan
+	return nil
+}
+
+func (t *tunHandler) NewPacketConnection(ctx context.Context, conn network.PacketConn, m metadata.Metadata) error {
+	addr := m.Source.String()
+	if t.EventLogger != nil {
+		t.EventLogger.UDPRequest(addr)
+	}
+	var closeErr error
+	defer func() {
+		if t.EventLogger != nil {
+			t.EventLogger.UDPError(addr, closeErr)
+		}
+	}()
+	rc, err := t.HyClient.UDP()
+	if err != nil {
+		closeErr = err
+		// the returned err is simply called into NewError again
+		return nil
+	}
+	defer rc.Close()
+
+	// start forwarding
+	copyErrChan := make(chan error, 3)
+	go func() {
+		<-ctx.Done()
+		copyErrChan <- ctx.Err()
+	}()
+	// local <- remote
+	go func() {
+		for {
+			bs, from, err := rc.Receive()
+			if err != nil {
+				copyErrChan <- err
+				return
+			}
+			var fromAddr metadata.Socksaddr
+			if ap, perr := netip.ParseAddrPort(from); perr == nil {
+				fromAddr = metadata.SocksaddrFromNetIP(ap)
+			} else {
+				fromAddr.Fqdn = from
+			}
+			err = conn.WritePacket(buf.As(bs), fromAddr)
+			if err != nil {
+				copyErrChan <- err
+				return
+			}
+		}
+	}()
+	// local -> remote
+	go func() {
+		buffer := buf.NewPacket()
+		defer buffer.Release()
+
+		for {
+			buffer.Reset()
+			addr, err := conn.ReadPacket(buffer)
+			if err != nil {
+				copyErrChan <- err
+				return
+			}
+			err = rc.Send(buffer.Bytes(), addr.String())
+			if err != nil {
+				copyErrChan <- err
+				return
+			}
+		}
+	}()
+	closeErr = <-copyErrChan
+	return nil
+}
+
+func (t *tunHandler) NewError(ctx context.Context, err error) {
+	// unused
+}
+
+type interfaceFinder struct{}
+
+var _ control.InterfaceFinder = (*interfaceFinder)(nil)
+
+func (f *interfaceFinder) InterfaceIndexByName(name string) (int, error) {
+	ifce, err := net.InterfaceByName(name)
+	if err != nil {
+		return -1, err
+	}
+	return ifce.Index, nil
+}
+
+func (f *interfaceFinder) InterfaceNameByIndex(index int) (string, error) {
+	ifce, err := net.InterfaceByIndex(index)
+	if err != nil {
+		return "", err
+	}
+	return ifce.Name, nil
+}

app/internal/url/url_test.go

@@ -0,0 +1,91 @@
+package url
+
+import (
+	"reflect"
+	"testing"
+)
+
+func TestParse(t *testing.T) {
+	type args struct {
+		rawURL string
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    *URL
+		wantErr bool
+	}{
+		{
+			name: "no port",
+			args: args{
+				rawURL: "hysteria2://ganggang@icecreamsogood/",
+			},
+			want: &URL{
+				Scheme: "hysteria2",
+				User:   User("ganggang"),
+				Host:   "icecreamsogood",
+				Path:   "/",
+			},
+		},
+		{
+			name: "single port",
+			args: args{
+				rawURL: "hysteria2://yesyes@icecreamsogood:8888/",
+			},
+			want: &URL{
+				Scheme: "hysteria2",
+				User:   User("yesyes"),
+				Host:   "icecreamsogood:8888",
+				Path:   "/",
+			},
+		},
+		{
+			name: "multi port",
+			args: args{
+				rawURL: "hysteria2://darkness@laplus.org:8888,9999,11111/",
+			},
+			want: &URL{
+				Scheme: "hysteria2",
+				User:   User("darkness"),
+				Host:   "laplus.org:8888,9999,11111",
+				Path:   "/",
+			},
+		},
+		{
+			name: "range port",
+			args: args{
+				rawURL: "hysteria2://darkness@laplus.org:8888-9999/",
+			},
+			want: &URL{
+				Scheme: "hysteria2",
+				User:   User("darkness"),
+				Host:   "laplus.org:8888-9999",
+				Path:   "/",
+			},
+		},
+		{
+			name: "both",
+			args: args{
+				rawURL: "hysteria2://gawr:gura@atlantis.moe:443,7788-8899,10010/",
+			},
+			want: &URL{
+				Scheme: "hysteria2",
+				User:   UserPassword("gawr", "gura"),
+				Host:   "atlantis.moe:443,7788-8899,10010",
+				Path:   "/",
+			},
+		},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := Parse(tt.args.rawURL)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("Parse() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if !reflect.DeepEqual(got, tt.want) {
+				t.Errorf("Parse() got = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

app/internal/utils/bpsconv.go

@@ -0,0 +1,68 @@
+package utils
+
+import (
+	"errors"
+	"fmt"
+	"strconv"
+	"strings"
+)
+
+const (
+	Byte     = 1
+	Kilobyte = Byte * 1000
+	Megabyte = Kilobyte * 1000
+	Gigabyte = Megabyte * 1000
+	Terabyte = Gigabyte * 1000
+)
+
+// StringToBps converts a string to a bandwidth value in bytes per second.
+// E.g. "100 Mbps", "512 kbps", "1g" are all valid.
+func StringToBps(s string) (uint64, error) {
+	s = strings.ToLower(strings.TrimSpace(s))
+	spl := 0
+	for i, c := range s {
+		if c < '0' || c > '9' {
+			spl = i
+			break
+		}
+	}
+	if spl == 0 {
+		// No unit or no value
+		return 0, errors.New("invalid format")
+	}
+	v, err := strconv.ParseUint(s[:spl], 10, 64)
+	if err != nil {
+		return 0, err
+	}
+	unit := strings.TrimSpace(s[spl:])
+
+	switch strings.ToLower(unit) {
+	case "b", "bps":
+		return v * Byte / 8, nil
+	case "k", "kb", "kbps":
+		return v * Kilobyte / 8, nil
+	case "m", "mb", "mbps":
+		return v * Megabyte / 8, nil
+	case "g", "gb", "gbps":
+		return v * Gigabyte / 8, nil
+	case "t", "tb", "tbps":
+		return v * Terabyte / 8, nil
+	default:
+		return 0, errors.New("unsupported unit")
+	}
+}
+
+// ConvBandwidth handles both string and int types for bandwidth.
+// When using string, it will be parsed as a bandwidth string with units.
+// When using int, it will be parsed as a raw bandwidth in bytes per second.
+// It does NOT support float types.
+func ConvBandwidth(bw interface{}) (uint64, error) {
+	switch bwT := bw.(type) {
+	case string:
+		return StringToBps(bwT)
+	case int:
+		return uint64(bwT), nil
+	default:
+		return 0, fmt.Errorf("invalid type %T for bandwidth", bwT)
+	}
+}

app/internal/utils/bpsconv_test.go

@@ -0,0 +1,40 @@
+package utils
+
+import "testing"
+
+func TestStringToBps(t *testing.T) {
+	type args struct {
+		s string
+	}
+	tests := []struct {
+		name    string
+		args    args
+		want    uint64
+		wantErr bool
+	}{
+		{"bps", args{"800 bps"}, 100, false},
+		{"kbps", args{"800 kbps"}, 100_000, false},
+		{"mbps", args{"800 mbps"}, 100_000_000, false},
+		{"gbps", args{"800 gbps"}, 100_000_000_000, false},
+		{"tbps", args{"800 tbps"}, 100_000_000_000_000, false},
+		{"mbps simp", args{"100m"}, 12_500_000, false},
+		{"gbps simp upper", args{"2G"}, 250_000_000, false},
+		{"invalid 1", args{"damn"}, 0, true},
+		{"invalid 2", args{"6444"}, 0, true},
+		{"invalid 3", args{"5.4 mbps"}, 0, true},
+		{"invalid 4", args{"kbps"}, 0, true},
+		{"invalid 5", args{"1234 5678 gbps"}, 0, true},
+	}
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			got, err := StringToBps(tt.args.s)
+			if (err != nil) != tt.wantErr {
+				t.Errorf("StringToBps() error = %v, wantErr %v", err, tt.wantErr)
+				return
+			}
+			if got != tt.want {
+				t.Errorf("StringToBps() got = %v, want %v", got, tt.want)
+			}
+		})
+	}
+}

app/internal/utils/certloader.go

@@ -0,0 +1,198 @@
+package utils
+
+import (
+	"crypto/tls"
+	"crypto/x509"
+	"fmt"
+	"net"
+	"os"
+	"strings"
+	"sync"
+	"sync/atomic"
+	"time"
+)
+
+type LocalCertificateLoader struct {
+	CertFile string
+	KeyFile  string
+	SNIGuard SNIGuardFunc
+
+	lock  sync.Mutex
+	cache atomic.Pointer[localCertificateCache]
+}
+
+type SNIGuardFunc func(info *tls.ClientHelloInfo, cert *tls.Certificate) error
+
+// localCertificateCache holds the certificate and its mod times.
+// this struct is designed to be read-only.
+//
+// to update the cache, use LocalCertificateLoader.makeCache and
+// update the LocalCertificateLoader.cache field.
+type localCertificateCache struct {
+	certificate *tls.Certificate
+	certModTime time.Time
+	keyModTime  time.Time
+}
+
+func (l *LocalCertificateLoader) InitializeCache() error {
+	l.lock.Lock()
+	defer l.lock.Unlock()
+
+	cache, err := l.makeCache()
+	if err != nil {
+		return err
+	}
+
+	l.cache.Store(cache)
+	return nil
+}
+
+func (l *LocalCertificateLoader) GetCertificate(info *tls.ClientHelloInfo) (*tls.Certificate, error) {
+	cert, err := l.getCertificateWithCache()
+	if err != nil {
+		return nil, err
+	}
+
+	if l.SNIGuard == nil {
+		return cert, nil
+	}
+	err = l.SNIGuard(info, cert)
+	if err != nil {
+		return nil, err
+	}
+
+	return cert, nil
+}
+
+func (l *LocalCertificateLoader) checkModTime() (certModTime, keyModTime time.Time, err error) {
+	fi, err := os.Stat(l.CertFile)
+	if err != nil {
+		err = fmt.Errorf("failed to stat certificate file: %w", err)
+		return
+	}
+	certModTime = fi.ModTime()
+
+	fi, err = os.Stat(l.KeyFile)
+	if err != nil {
+		err = fmt.Errorf("failed to stat key file: %w", err)
+		return
+	}
+	keyModTime = fi.ModTime()
+	return
+}
+
+func (l *LocalCertificateLoader) makeCache() (cache *localCertificateCache, err error) {
+	c := &localCertificateCache{}
+
+	c.certModTime, c.keyModTime, err = l.checkModTime()
+	if err != nil {
+		return
+	}
+
+	cert, err := tls.LoadX509KeyPair(l.CertFile, l.KeyFile)
+	if err != nil {
+		return
+	}
+	c.certificate = &cert
+	if c.certificate.Leaf == nil {
+		// certificate.Leaf was left nil by tls.LoadX509KeyPair before Go 1.23
+		c.certificate.Leaf, err = x509.ParseCertificate(cert.Certificate[0])
+		if err != nil {
+			return
+		}
+	}
+
+	cache = c
+	return
+}
+
+func (l *LocalCertificateLoader) getCertificateWithCache() (*tls.Certificate, error) {
+	cache := l.cache.Load()
+
+	certModTime, keyModTime, terr := l.checkModTime()
+	if terr != nil {
+		if cache != nil {
+			// use cache when file is temporarily unavailable
+			return cache.certificate, nil
+		}
+		return nil, terr
+	}
+
+	if cache != nil && cache.certModTime.Equal(certModTime) && cache.keyModTime.Equal(keyModTime) {
+		// cache is up-to-date
+		return cache.certificate, nil
+	}
+
+	if cache != nil {
+		if !l.lock.TryLock() {
+			// another goroutine is updating the cache
+			return cache.certificate, nil
+		}
+	} else {
+		l.lock.Lock()
+	}
+	defer l.lock.Unlock()
+
+	if l.cache.Load() != cache {
+		// another goroutine updated the cache
+		return l.cache.Load().certificate, nil
+	}
+
+	newCache, err := l.makeCache()
+	if err != nil {
+		if cache != nil {
+			// use cache when loading failed
+			return cache.certificate, nil
+		}
+		return nil, err
+	}
+
+	l.cache.Store(newCache)
+	return newCache.certificate, nil
+}
+
+// getNameFromClientHello returns a normalized form of hello.ServerName.
+// If hello.ServerName is empty (i.e. client did not use SNI), then the
+// associated connection's local address is used to extract an IP address.
+//
+// ref: https://github.com/caddyserver/certmagic/blob/3bad5b6bb595b09c14bd86ff0b365d302faaf5e2/handshake.go#L838
+func getNameFromClientHello(hello *tls.ClientHelloInfo) string {
+	normalizedName := func(serverName string) string {
+		return strings.ToLower(strings.TrimSpace(serverName))
+	}
+	localIPFromConn := func(c net.Conn) string {
+		if c == nil {
+			return ""
+		}
+		localAddr := c.LocalAddr().String()
+		ip, _, err := net.SplitHostPort(localAddr)
+		if err != nil {
+			ip = localAddr
+		}
+		if scopeIDStart := strings.Index(ip, "%"); scopeIDStart > -1 {
+			ip = ip[:scopeIDStart]
+		}
+		return ip
+	}
+
+	if name := normalizedName(hello.ServerName); name != "" {
+		return name
+	}
+	return localIPFromConn(hello.Conn)
+}
+
+func SNIGuardDNSSAN(info *tls.ClientHelloInfo, cert *tls.Certificate) error {
+	if len(cert.Leaf.DNSNames) == 0 {
+		return nil
+	}
+	return SNIGuardStrict(info, cert)
+}
+
+func SNIGuardStrict(info *tls.ClientHelloInfo, cert *tls.Certificate) error {
+	hostname := getNameFromClientHello(info)
+	err := cert.Leaf.VerifyHostname(hostname)
+	if err != nil {
+		return fmt.Errorf("sni guard: %w", err)
+	}
+	return nil
+}

app/internal/utils/certloader_test.go

@@ -0,0 +1,139 @@
+package utils
+
+import (
+	"crypto/tls"
+	"log"
+	"net/http"
+	"os"
+	"os/exec"
+	"strings"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+const (
+	testListen   = "127.82.39.147:12947"
+	testCAFile   = "./testcerts/ca"
+	testCertFile = "./testcerts/cert"
+	testKeyFile  = "./testcerts/key"
+)
+
+func TestCertificateLoaderPathError(t *testing.T) {
+	assert.NoError(t, os.RemoveAll(testCertFile))
+	assert.NoError(t, os.RemoveAll(testKeyFile))
+	loader := LocalCertificateLoader{
+		CertFile: testCertFile,
+		KeyFile:  testKeyFile,
+		SNIGuard: SNIGuardStrict,
+	}
+	err := loader.InitializeCache()
+	var pathErr *os.PathError
+	assert.ErrorAs(t, err, &pathErr)
+}
+
+func TestCertificateLoaderFullChain(t *testing.T) {
+	assert.NoError(t, generateTestCertificate([]string{"example.com"}, "fullchain"))
+
+	loader := LocalCertificateLoader{
+		CertFile: testCertFile,
+		KeyFile:  testKeyFile,
+		SNIGuard: SNIGuardStrict,
+	}
+	assert.NoError(t, loader.InitializeCache())
+
+	lis, err := tls.Listen("tcp", testListen, &tls.Config{
+		GetCertificate: loader.GetCertificate,
+	})
+	assert.NoError(t, err)
+	defer lis.Close()
+	go http.Serve(lis, nil)
+
+	assert.Error(t, runTestTLSClient("unmatched-sni.example.com"))
+	assert.Error(t, runTestTLSClient(""))
+	assert.NoError(t, runTestTLSClient("example.com"))
+}
+
+func TestCertificateLoaderNoSAN(t *testing.T) {
+	assert.NoError(t, generateTestCertificate(nil, "selfsign"))
+
+	loader := LocalCertificateLoader{
+		CertFile: testCertFile,
+		KeyFile:  testKeyFile,
+		SNIGuard: SNIGuardDNSSAN,
+	}
+	assert.NoError(t, loader.InitializeCache())
+
+	lis, err := tls.Listen("tcp", testListen, &tls.Config{
+		GetCertificate: loader.GetCertificate,
+	})
+	assert.NoError(t, err)
+	defer lis.Close()
+	go http.Serve(lis, nil)
+
+	assert.NoError(t, runTestTLSClient(""))
+}
+
+func TestCertificateLoaderReplaceCertificate(t *testing.T) {
+	assert.NoError(t, generateTestCertificate([]string{"example.com"}, "fullchain"))
+
+	loader := LocalCertificateLoader{
+		CertFile: testCertFile,
+		KeyFile:  testKeyFile,
+		SNIGuard: SNIGuardStrict,
+	}
+	assert.NoError(t, loader.InitializeCache())
+
+	lis, err := tls.Listen("tcp", testListen, &tls.Config{
+		GetCertificate: loader.GetCertificate,
+	})
+	assert.NoError(t, err)
+	defer lis.Close()
+	go http.Serve(lis, nil)
+
+	assert.NoError(t, runTestTLSClient("example.com"))
+	assert.Error(t, runTestTLSClient("2.example.com"))
+
+	assert.NoError(t, generateTestCertificate([]string{"2.example.com"}, "fullchain"))
+
+	assert.Error(t, runTestTLSClient("example.com"))
+	assert.NoError(t, runTestTLSClient("2.example.com"))
+}
+
+func generateTestCertificate(dnssan []string, certType string) error {
+	args := []string{
+		"certloader_test_gencert.py",
+		"--ca", testCAFile,
+		"--cert", testCertFile,
+		"--key", testKeyFile,
+		"--type", certType,
+	}
+	if len(dnssan) > 0 {
+		args = append(args, "--dnssan", strings.Join(dnssan, ","))
+	}
+	cmd := exec.Command("python", args...)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		log.Printf("Failed to generate test certificate: %s", out)
+		return err
+	}
+	return nil
+}
+
+func runTestTLSClient(sni string) error {
+	args := []string{
+		"certloader_test_tlsclient.py",
+		"--server", testListen,
+		"--ca", testCAFile,
+	}
+	if sni != "" {
+		args = append(args, "--sni", sni)
+	}
+	cmd := exec.Command("python", args...)
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		log.Printf("Failed to run test TLS client: %s", out)
+		return err
+	}
+	return nil
+}

app/internal/utils/certloader_test_gencert.py

@@ -0,0 +1,134 @@
+import argparse
+import datetime
+from cryptography import x509
+from cryptography.x509.oid import NameOID
+from cryptography.hazmat.primitives import hashes
+from cryptography.hazmat.primitives.asymmetric import ec
+from cryptography.hazmat.primitives.serialization import Encoding, PrivateFormat, NoEncryption
+
+
+def create_key():
+    return ec.generate_private_key(ec.SECP256R1())
+
+
+def create_certificate(cert_type, subject, issuer, private_key, public_key, dns_san=None):
+    serial_number = x509.random_serial_number()
+    not_valid_before = datetime.datetime.now(datetime.UTC)
+    not_valid_after = not_valid_before + datetime.timedelta(days=365)
+
+    subject_name = x509.Name([
+        x509.NameAttribute(NameOID.COUNTRY_NAME, subject.get('C', 'ZZ')),
+        x509.NameAttribute(NameOID.ORGANIZATION_NAME, subject.get('O', 'No Organization')),
+        x509.NameAttribute(NameOID.COMMON_NAME, subject.get('CN', 'No CommonName')),
+    ])
+    issuer_name = x509.Name([
+        x509.NameAttribute(NameOID.COUNTRY_NAME, issuer.get('C', 'ZZ')),
+        x509.NameAttribute(NameOID.ORGANIZATION_NAME, issuer.get('O', 'No Organization')),
+        x509.NameAttribute(NameOID.COMMON_NAME, issuer.get('CN', 'No CommonName')),
+    ])
+    builder = x509.CertificateBuilder()
+    builder = builder.subject_name(subject_name)
+    builder = builder.issuer_name(issuer_name)
+    builder = builder.public_key(public_key)
+    builder = builder.serial_number(serial_number)
+    builder = builder.not_valid_before(not_valid_before)
+    builder = builder.not_valid_after(not_valid_after)
+    if cert_type == 'root':
+        builder = builder.add_extension(
+            x509.BasicConstraints(ca=True, path_length=None), critical=True
+        )
+    elif cert_type == 'intermediate':
+        builder = builder.add_extension(
+            x509.BasicConstraints(ca=True, path_length=0), critical=True
+        )
+    elif cert_type == 'leaf':
+        builder = builder.add_extension(
+            x509.BasicConstraints(ca=False, path_length=None), critical=True
+        )
+    else:
+        raise ValueError(f'Invalid cert_type: {cert_type}')
+    if dns_san:
+        builder = builder.add_extension(
+            x509.SubjectAlternativeName([x509.DNSName(d) for d in dns_san.split(',')]),
+            critical=False
+        )
+    return builder.sign(private_key=private_key, algorithm=hashes.SHA256())
+
+
+def main():
+    parser = argparse.ArgumentParser(description='Generate HTTPS server certificate.')
+    parser.add_argument('--ca', required=True,
+                        help='Path to write the X509 CA certificate in PEM format')
+    parser.add_argument('--cert', required=True,
+                        help='Path to write the X509 certificate in PEM format')
+    parser.add_argument('--key', required=True,
+                        help='Path to write the private key in PEM format')
+    parser.add_argument('--dnssan', required=False, default=None,
+                        help='Comma-separated list of DNS SANs')
+    parser.add_argument('--type', required=True, choices=['selfsign', 'fullchain'],
+                        help='Type of certificate to generate')
+
+    args = parser.parse_args()
+
+    key = create_key()
+    public_key = key.public_key()
+
+    if args.type == 'selfsign':
+        subject = {"C": "ZZ", "O": "Certificate", "CN": "Certificate"}
+        cert = create_certificate(
+            cert_type='root',
+            subject=subject,
+            issuer=subject,
+            private_key=key,
+            public_key=public_key,
+            dns_san=args.dnssan)
+        with open(args.ca, 'wb') as f:
+            f.write(cert.public_bytes(Encoding.PEM))
+        with open(args.cert, 'wb') as f:
+            f.write(cert.public_bytes(Encoding.PEM))
+        with open(args.key, 'wb') as f:
+            f.write(
+                key.private_bytes(Encoding.PEM, PrivateFormat.TraditionalOpenSSL, NoEncryption()))
+
+    elif args.type == 'fullchain':
+        ca_key = create_key()
+        ca_public_key = ca_key.public_key()
+        ca_subject = {"C": "ZZ", "O": "Root CA", "CN": "Root CA"}
+        ca_cert = create_certificate(
+            cert_type='root',
+            subject=ca_subject,
+            issuer=ca_subject,
+            private_key=ca_key,
+            public_key=ca_public_key)
+
+        intermediate_key = create_key()
+        intermediate_public_key = intermediate_key.public_key()
+        intermediate_subject = {"C": "ZZ", "O": "Intermediate CA", "CN": "Intermediate CA"}
+        intermediate_cert = create_certificate(
+            cert_type='intermediate',
+            subject=intermediate_subject,
+            issuer=ca_subject,
+            private_key=ca_key,
+            public_key=intermediate_public_key)
+
+        leaf_subject = {"C": "ZZ", "O": "Leaf Certificate", "CN": "Leaf Certificate"}
+        cert = create_certificate(
+            cert_type='leaf',
+            subject=leaf_subject,
+            issuer=intermediate_subject,
+            private_key=intermediate_key,
+            public_key=public_key,
+            dns_san=args.dnssan)
+
+        with open(args.ca, 'wb') as f:
+            f.write(ca_cert.public_bytes(Encoding.PEM))
+        with open(args.cert, 'wb') as f:
+            f.write(cert.public_bytes(Encoding.PEM))
+            f.write(intermediate_cert.public_bytes(Encoding.PEM))
+        with open(args.key, 'wb') as f:
+            f.write(
+                key.private_bytes(Encoding.PEM, PrivateFormat.TraditionalOpenSSL, NoEncryption()))
+
+
+if __name__ == "__main__":
+    main()

app/internal/utils/certloader_test_tlsclient.py

@@ -0,0 +1,60 @@
+import argparse
+import ssl
+import socket
+import sys
+
+
+def check_tls(server, ca_cert, sni, alpn):
+    try:
+        host, port = server.split(":")
+        port = int(port)
+
+        if ca_cert:
+            context = ssl.create_default_context(ssl.Purpose.SERVER_AUTH, cafile=ca_cert)
+            context.check_hostname = sni is not None
+            context.verify_mode = ssl.CERT_REQUIRED
+        else:
+            context = ssl.create_default_context()
+            context.check_hostname = False
+            context.verify_mode = ssl.CERT_NONE
+
+        if alpn:
+            context.set_alpn_protocols([p for p in alpn.split(",")])
+
+        with socket.create_connection((host, port)) as sock:
+            with context.wrap_socket(sock, server_hostname=sni) as ssock:
+                # Verify handshake and certificate
+                print(f'Connected to {ssock.version()} using {ssock.cipher()}')
+                print(f'Server certificate validated and details: {ssock.getpeercert()}')
+                print("OK")
+                return 0
+    except Exception as e:
+        print(f"Error: {e}")
+        return 1
+
+
+def main():
+    parser = argparse.ArgumentParser(description="Test TLS Server")
+    parser.add_argument("--server", required=True,
+                        help="Server address to test (e.g., 127.1.2.3:8443)")
+    parser.add_argument("--ca", required=False, default=None,
+                        help="CA certificate file used to validate the server certificate"
+                        "Omit to use insecure connection")
+    parser.add_argument("--sni", required=False, default=None,
+                        help="SNI to send in ClientHello")
+    parser.add_argument("--alpn", required=False, default='h2',
+                        help="ALPN to send in ClientHello")
+
+    args = parser.parse_args()
+
+    exit_status = check_tls(
+        server=args.server,
+        ca_cert=args.ca,
+        sni=args.sni,
+        alpn=args.alpn)
+
+    sys.exit(exit_status)
+
+
+if __name__ == "__main__":
+    main()

app/internal/utils/geoloader.go

@@ -0,0 +1,172 @@
+package utils
+
+import (
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"time"
+
+	"github.com/apernet/hysteria/extras/v2/outbounds/acl"
+	"github.com/apernet/hysteria/extras/v2/outbounds/acl/v2geo"
+)
+
+const (
+	geoipFilename   = "geoip.dat"
+	geoipURL        = "https://cdn.jsdelivr.net/gh/Loyalsoldier/v2ray-rules-dat@release/geoip.dat"
+	geositeFilename = "geosite.dat"
+	geositeURL      = "https://cdn.jsdelivr.net/gh/Loyalsoldier/v2ray-rules-dat@release/geosite.dat"
+	geoDlTmpPattern = ".hysteria-geoloader.dlpart.*"
+
+	geoDefaultUpdateInterval = 7 * 24 * time.Hour // 7 days
+)
+
+var _ acl.GeoLoader = (*GeoLoader)(nil)
+
+// GeoLoader provides the on-demand GeoIP/GeoSite database
+// loading functionality required by the ACL engine.
+// Empty filenames = automatic download from built-in URLs.
+type GeoLoader struct {
+	GeoIPFilename   string
+	GeoSiteFilename string
+	UpdateInterval  time.Duration
+
+	DownloadFunc    func(filename, url string)
+	DownloadErrFunc func(err error)
+
+	geoipMap   map[string]*v2geo.GeoIP
+	geositeMap map[string]*v2geo.GeoSite
+}
+
+func (l *GeoLoader) shouldDownload(filename string) bool {
+	info, err := os.Stat(filename)
+	if os.IsNotExist(err) {
+		return true
+	}
+	if info.Size() == 0 {
+		// empty files are loadable by v2geo, but we consider it broken
+		return true
+	}
+	dt := time.Now().Sub(info.ModTime())
+	if l.UpdateInterval == 0 {
+		return dt > geoDefaultUpdateInterval
+	} else {
+		return dt > l.UpdateInterval
+	}
+}
+
+func (l *GeoLoader) downloadAndCheck(filename, url string, checkFunc func(filename string) error) error {
+	l.DownloadFunc(filename, url)
+
+	resp, err := http.Get(url)
+	if err != nil {
+		l.DownloadErrFunc(err)
+		return err
+	}
+	defer resp.Body.Close()
+
+	f, err := os.CreateTemp(".", geoDlTmpPattern)
+	if err != nil {
+		l.DownloadErrFunc(err)
+		return err
+	}
+	defer os.Remove(f.Name())
+
+	_, err = io.Copy(f, resp.Body)
+	if err != nil {
+		f.Close()
+		l.DownloadErrFunc(err)
+		return err
+	}
+	f.Close()
+
+	err = checkFunc(f.Name())
+	if err != nil {
+		l.DownloadErrFunc(fmt.Errorf("integrity check failed: %w", err))
+		return err
+	}
+
+	err = os.Rename(f.Name(), filename)
+	if err != nil {
+		l.DownloadErrFunc(fmt.Errorf("rename failed: %w", err))
+		return err
+	}
+
+	return nil
+}
+
+func (l *GeoLoader) LoadGeoIP() (map[string]*v2geo.GeoIP, error) {
+	if l.geoipMap != nil {
+		return l.geoipMap, nil
+	}
+	autoDL := false
+	filename := l.GeoIPFilename
+	if filename == "" {
+		autoDL = true
+		filename = geoipFilename
+	}
+	if autoDL {
+		if !l.shouldDownload(filename) {
+			m, err := v2geo.LoadGeoIP(filename)
+			if err == nil {
+				l.geoipMap = m
+				return m, nil
+			}
+			// file is broken, download it again
+		}
+		err := l.downloadAndCheck(filename, geoipURL, func(filename string) error {
+			_, err := v2geo.LoadGeoIP(filename)
+			return err
+		})
+		if err != nil {
+			// as long as the previous download exists, fallback to it
+			if _, serr := os.Stat(filename); os.IsNotExist(serr) {
+				return nil, err
+			}
+		}
+	}
+	m, err := v2geo.LoadGeoIP(filename)
+	if err != nil {
+		return nil, err
+	}
+	l.geoipMap = m
+	return m, nil
+}
+
+func (l *GeoLoader) LoadGeoSite() (map[string]*v2geo.GeoSite, error) {
+	if l.geositeMap != nil {
+		return l.geositeMap, nil
+	}
+	autoDL := false
+	filename := l.GeoSiteFilename
+	if filename == "" {
+		autoDL = true
+		filename = geositeFilename
+	}
+	if autoDL {
+		if !l.shouldDownload(filename) {
+			m, err := v2geo.LoadGeoSite(filename)
+			if err == nil {
+				l.geositeMap = m
+				return m, nil
+			}
+			// file is broken, download it again
+		}
+		err := l.downloadAndCheck(filename, geositeURL, func(filename string) error {
+			_, err := v2geo.LoadGeoSite(filename)
+			return err
+		})
+		if err != nil {
+			// as long as the previous download exists, fallback to it
+			if _, serr := os.Stat(filename); os.IsNotExist(serr) {
+				return nil, err
+			}
+		}
+	}
+	m, err := v2geo.LoadGeoSite(filename)
+	if err != nil {
+		return nil, err
+	}
+	l.geositeMap = m
+	return m, nil
+}

app/internal/utils/qr.go

@@ -0,0 +1,16 @@
+package utils
+
+import (
+	"os"
+
+	"github.com/mdp/qrterminal/v3"
+)
+
+func PrintQR(str string) {
+	qrterminal.GenerateWithConfig(str, qrterminal.Config{
+		Level:     qrterminal.L,
+		Writer:    os.Stdout,
+		BlackChar: qrterminal.BLACK,
+		WhiteChar: qrterminal.WHITE,
+	})
+}

app/internal/utils/testcerts/.gitignore

@@ -0,0 +1,3 @@
+# This directory is used for certificate generation in certloader_test.go
+/*
+!/.gitignore

app/internal/utils/update.go

@@ -0,0 +1,96 @@
+package utils
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+const (
+	updateCheckEndpoint = "https://api.hy2.io/v1/update"
+	updateCheckTimeout  = 10 * time.Second
+)
+
+type UpdateChecker struct {
+	CurrentVersion string
+	Platform       string
+	Architecture   string
+	Channel        string
+	Side           string
+	Client         *http.Client
+}
+
+func NewServerUpdateChecker(currentVersion, platform, architecture, channel string) *UpdateChecker {
+	return &UpdateChecker{
+		CurrentVersion: currentVersion,
+		Platform:       platform,
+		Architecture:   architecture,
+		Channel:        channel,
+		Side:           "server",
+		Client: &http.Client{
+			Timeout: updateCheckTimeout,
+		},
+	}
+}
+
+// NewClientUpdateChecker ensures that update checks are routed through a HyClient,
+// not being sent directly. This safeguard is CRITICAL, especially in scenarios where
+// users use Hysteria to bypass censorship. Making direct HTTPS requests to the API
+// endpoint could be easily spotted by censors (through SNI, for example), and could
+// serve as a signal to identify and penalize Hysteria users.
+func NewClientUpdateChecker(currentVersion, platform, architecture, channel string, hyClient client.Client) *UpdateChecker {
+	return &UpdateChecker{
+		CurrentVersion: currentVersion,
+		Platform:       platform,
+		Architecture:   architecture,
+		Channel:        channel,
+		Side:           "client",
+		Client: &http.Client{
+			Timeout: updateCheckTimeout,
+			Transport: &http.Transport{
+				DialContext: func(_ context.Context, network, addr string) (net.Conn, error) {
+					// Unfortunately HyClient doesn't support context for now
+					return hyClient.TCP(addr)
+				},
+			},
+		},
+	}
+}
+
+type UpdateResponse struct {
+	HasUpdate     bool   `json:"update"`
+	LatestVersion string `json:"lver"`
+	URL           string `json:"url"`
+	Urgent        bool   `json:"urgent"`
+}
+
+func (uc *UpdateChecker) Check() (*UpdateResponse, error) {
+	url := fmt.Sprintf("%s?cver=%s&plat=%s&arch=%s&chan=%s&side=%s",
+		updateCheckEndpoint,
+		uc.CurrentVersion,
+		uc.Platform,
+		uc.Architecture,
+		uc.Channel,
+		uc.Side,
+	)
+	resp, err := uc.Client.Get(url)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	if resp.StatusCode != http.StatusOK {
+		return nil, fmt.Errorf("unexpected status code: %d", resp.StatusCode)
+	}
+	var uResp UpdateResponse
+	decoder := json.NewDecoder(resp.Body)
+	if err := decoder.Decode(&uResp); err != nil {
+		return nil, err
+	}
+	return &uResp, nil
+}

app/internal/utils_test/mock.go

@@ -0,0 +1,106 @@
+package utils_test
+
+import (
+	"io"
+	"net"
+	"time"
+
+	"github.com/apernet/hysteria/core/v2/client"
+)
+
+type MockEchoHyClient struct{}
+
+func (c *MockEchoHyClient) TCP(addr string) (net.Conn, error) {
+	return &mockEchoTCPConn{
+		BufChan: make(chan []byte, 10),
+	}, nil
+}
+
+func (c *MockEchoHyClient) UDP() (client.HyUDPConn, error) {
+	return &mockEchoUDPConn{
+		BufChan: make(chan mockEchoUDPPacket, 10),
+	}, nil
+}
+
+func (c *MockEchoHyClient) Close() error {
+	return nil
+}
+
+type mockEchoTCPConn struct {
+	BufChan chan []byte
+}
+
+func (c *mockEchoTCPConn) Read(b []byte) (n int, err error) {
+	buf := <-c.BufChan
+	if buf == nil {
+		// EOF
+		return 0, io.EOF
+	}
+	return copy(b, buf), nil
+}
+
+func (c *mockEchoTCPConn) Write(b []byte) (n int, err error) {
+	c.BufChan <- b
+	return len(b), nil
+}
+
+func (c *mockEchoTCPConn) Close() error {
+	close(c.BufChan)
+	return nil
+}
+
+func (c *mockEchoTCPConn) LocalAddr() net.Addr {
+	// Not implemented
+	return nil
+}
+
+func (c *mockEchoTCPConn) RemoteAddr() net.Addr {
+	// Not implemented
+	return nil
+}
+
+func (c *mockEchoTCPConn) SetDeadline(t time.Time) error {
+	// Not implemented
+	return nil
+}
+
+func (c *mockEchoTCPConn) SetReadDeadline(t time.Time) error {
+	// Not implemented
+	return nil
+}
+
+func (c *mockEchoTCPConn) SetWriteDeadline(t time.Time) error {
+	// Not implemented
+	return nil
+}
+
+type mockEchoUDPPacket struct {
+	Data []byte
+	Addr string
+}
+
+type mockEchoUDPConn struct {
+	BufChan chan mockEchoUDPPacket
+}
+
+func (c *mockEchoUDPConn) Receive() ([]byte, string, error) {
+	p := <-c.BufChan
+	if p.Data == nil {
+		// EOF
+		return nil, "", io.EOF
+	}
+	return p.Data, p.Addr, nil
+}
+
+func (c *mockEchoUDPConn) Send(bytes []byte, s string) error {
+	c.BufChan <- mockEchoUDPPacket{
+		Data: bytes,
+		Addr: s,
+	}
+	return nil
+}
+
+func (c *mockEchoUDPConn) Close() error {
+	close(c.BufChan)
+	return nil
+}

app/main.go

@@ -0,0 +1,7 @@
+package main
+
+import "github.com/apernet/hysteria/app/v2/cmd"
+
+func main() {
+	cmd.Execute()
+}

app/misc/socks5_test.py

@@ -0,0 +1,50 @@
+import socket
+import socks
+import time
+
+TARGET = "1.1.1.1"
+
+
+def test_tcp() -> None:
+    s = socks.socksocket(socket.AF_INET, socket.SOCK_STREAM)
+    s.set_proxy(socks.SOCKS5, "127.0.0.1", 1080)
+
+    print(f"TCP - Sending HTTP request to {TARGET}")
+    start = time.time()
+    s.connect((TARGET, 80))
+    s.send(b"GET / HTTP/1.1\r\nHost: " + TARGET.encode() + b"\r\n\r\n")
+    data = s.recv(1024)
+    if not data:
+        print("No data received")
+    elif not data.startswith(b"HTTP/1.1 "):
+        print("Invalid response received")
+    else:
+        print("TCP test passed")
+    end = time.time()
+    s.close()
+
+    print(f"Time: {round((end - start) * 1000, 2)} ms")
+
+
+def test_udp() -> None:
+    s = socks.socksocket(socket.AF_INET, socket.SOCK_DGRAM)
+    s.set_proxy(socks.SOCKS5, "127.0.0.1", 1080)
+
+    req = b"\x12\x34\x01\x00\x00\x01\x00\x00\x00\x00\x00\x00\x05\x62\x61\x69\x64\x75\x03\x63\x6f\x6d\x00\x00\x01\x00\x01"
+    print(f"UDP - Sending DNS request to {TARGET}")
+    start = time.time()
+    s.sendto(req, (TARGET, 53))
+    (rsp, address) = s.recvfrom(4096)
+    if address[0] == TARGET and address[1] == 53 and rsp[0] == req[0] and rsp[1] == req[1]:
+        print("UDP test passed")
+    else:
+        print("Invalid response received")
+    end = time.time()
+    s.close()
+
+    print(f"Time: {round((end - start) * 1000, 2)} ms")
+
+
+if __name__ == "__main__":
+    test_tcp()
+    test_udp()

app/pprof.go

@@ -0,0 +1,22 @@
+//go:build pprof
+
+package main
+
+import (
+	"fmt"
+	"net/http"
+	_ "net/http/pprof"
+)
+
+const (
+	pprofListenAddr = ":6060"
+)
+
+func init() {
+	fmt.Printf("!!! pprof enabled, listening on %s\n", pprofListenAddr)
+	go func() {
+		if err := http.ListenAndServe(pprofListenAddr, nil); err != nil {
+			panic(err)
+		}
+	}()
+}

cmd/client.json

@@ -1,8 +0,0 @@
-{
-  "listen": "localhost:1080",
-  "server": "toby.moe:36712",
-  "name": "",
-  "insecure": false,
-  "up_mbps": 50,
-  "down_mbps": 80
-}

cmd/config.go

@@ -1,84 +0,0 @@
-package main
-
-import (
-	"encoding/json"
-	"flag"
-	"io/ioutil"
-	"os"
-	"reflect"
-	"strings"
-)
-
-const (
-	mbpsToBps = 125000
-
-	DefaultMaxReceiveStreamFlowControlWindow     = 33554432
-	DefaultMaxReceiveConnectionFlowControlWindow = 67108864
-	DefaultMaxIncomingStreams                    = 200
-)
-
-func loadConfig(cfg interface{}, args []string) error {
-	cfgVal := reflect.ValueOf(cfg).Elem()
-	fs := flag.NewFlagSet("", flag.ContinueOnError)
-	fsValMap := make(map[reflect.Value]interface{}, cfgVal.NumField())
-	for i := 0; i < cfgVal.NumField(); i++ {
-		structField := cfgVal.Type().Field(i)
-		tag := structField.Tag
-		switch structField.Type.Kind() {
-		case reflect.String:
-			fsValMap[cfgVal.Field(i)] =
-				fs.String(jsonTagToFlagName(tag.Get("json")), "", tag.Get("desc"))
-		case reflect.Int:
-			fsValMap[cfgVal.Field(i)] =
-				fs.Int(jsonTagToFlagName(tag.Get("json")), 0, tag.Get("desc"))
-		case reflect.Uint64:
-			fsValMap[cfgVal.Field(i)] =
-				fs.Uint64(jsonTagToFlagName(tag.Get("json")), 0, tag.Get("desc"))
-		case reflect.Bool:
-			var bf optionalBoolFlag
-			fs.Var(&bf, jsonTagToFlagName(tag.Get("json")), tag.Get("desc"))
-			fsValMap[cfgVal.Field(i)] = &bf
-		}
-	}
-	configFile := fs.String("config", "", "Configuration file")
-	// Parse
-	if err := fs.Parse(args); err != nil {
-		os.Exit(1)
-	}
-	// Put together the config
-	if len(*configFile) > 0 {
-		cb, err := ioutil.ReadFile(*configFile)
-		if err != nil {
-			return err
-		}
-		if err := json.Unmarshal(cb, cfg); err != nil {
-			return err
-		}
-	}
-	// Flags override config from file
-	for field, val := range fsValMap {
-		switch v := val.(type) {
-		case *string:
-			if len(*v) > 0 {
-				field.SetString(*v)
-			}
-		case *int:
-			if *v != 0 {
-				field.SetInt(int64(*v))
-			}
-		case *uint64:
-			if *v != 0 {
-				field.SetUint(*v)
-			}
-		case *optionalBoolFlag:
-			if v.Exists {
-				field.SetBool(v.Value)
-			}
-		}
-	}
-	return nil
-}
-
-func jsonTagToFlagName(tag string) string {
-	return strings.ReplaceAll(tag, "_", "-")
-}

cmd/main.go

@@ -1,54 +0,0 @@
-package main
-
-import (
-	"fmt"
-	"os"
-	"strings"
-)
-
-// Injected when compiling
-var (
-	appVersion = "Unknown"
-	appCommit  = "Unknown"
-	appDate    = "Unknown"
-)
-
-var modeMap = map[string]func(args []string){
-	"relay server": relayServer,
-	"relay client": relayClient,
-	"proxy server": proxyServer,
-	"proxy client": proxyClient,
-}
-
-func main() {
-	if len(os.Args) == 2 && strings.ToLower(strings.TrimSpace(os.Args[1])) == "version" {
-		// Print version and quit
-		fmt.Printf("%-10s%s\n", "Version:", appVersion)
-		fmt.Printf("%-10s%s\n", "Commit:", appCommit)
-		fmt.Printf("%-10s%s\n", "Date:", appDate)
-		return
-	}
-	if len(os.Args) < 3 {
-		fmt.Println()
-		fmt.Printf("Usage: %s MODE SUBMODE [OPTIONS]\n\n"+
-			"Available mode/submode combinations: "+getModes()+"\n"+
-			"Use -h to see the available options for a mode.\n\n", os.Args[0])
-		return
-	}
-	modeStr := fmt.Sprintf("%s %s", strings.ToLower(strings.TrimSpace(os.Args[1])),
-		strings.ToLower(strings.TrimSpace(os.Args[2])))
-	f := modeMap[modeStr]
-	if f != nil {
-		f(os.Args[3:])
-	} else {
-		fmt.Println("Invalid mode:", modeStr)
-	}
-}
-
-func getModes() string {
-	modes := make([]string, 0, len(modeMap))
-	for mode := range modeMap {
-		modes = append(modes, mode)
-	}
-	return strings.Join(modes, ", ")
-}

cmd/proxy_client.go

@@ -1,81 +0,0 @@
-package main
-
-import (
-	"crypto/tls"
-	"crypto/x509"
-	"github.com/lucas-clemente/quic-go"
-	"github.com/lucas-clemente/quic-go/congestion"
-	hyCongestion "github.com/tobyxdd/hysteria/pkg/congestion"
-	"github.com/tobyxdd/hysteria/pkg/core"
-	"github.com/tobyxdd/hysteria/pkg/socks5"
-	"io/ioutil"
-	"log"
-)
-
-func proxyClient(args []string) {
-	var config proxyClientConfig
-	err := loadConfig(&config, args)
-	if err != nil {
-		log.Fatalln("Unable to load configuration:", err)
-	}
-	if err := config.Check(); err != nil {
-		log.Fatalln("Configuration error:", err)
-	}
-	log.Printf("Configuration loaded: %+v\n", config)
-
-	tlsConfig := &tls.Config{
-		NextProtos: []string{proxyTLSProtocol},
-		MinVersion: tls.VersionTLS13,
-	}
-	// Load CA
-	if len(config.CustomCAFile) > 0 {
-		bs, err := ioutil.ReadFile(config.CustomCAFile)
-		if err != nil {
-			log.Fatalln("Unable to load CA file:", err)
-		}
-		cp := x509.NewCertPool()
-		if !cp.AppendCertsFromPEM(bs) {
-			log.Fatalln("Unable to parse CA file", config.CustomCAFile)
-		}
-		tlsConfig.RootCAs = cp
-	}
-
-	quicConfig := &quic.Config{
-		MaxReceiveStreamFlowControlWindow:     config.ReceiveWindowConn,
-		MaxReceiveConnectionFlowControlWindow: config.ReceiveWindow,
-		KeepAlive:                             true,
-	}
-	if quicConfig.MaxReceiveStreamFlowControlWindow == 0 {
-		quicConfig.MaxReceiveStreamFlowControlWindow = DefaultMaxReceiveStreamFlowControlWindow
-	}
-	if quicConfig.MaxReceiveConnectionFlowControlWindow == 0 {
-		quicConfig.MaxReceiveConnectionFlowControlWindow = DefaultMaxReceiveConnectionFlowControlWindow
-	}
-
-	client, err := core.NewClient(config.ServerAddr, config.Username, config.Password, tlsConfig, quicConfig,
-		uint64(config.UpMbps)*mbpsToBps, uint64(config.DownMbps)*mbpsToBps,
-		func(refBPS uint64) congestion.SendAlgorithmWithDebugInfos {
-			return hyCongestion.NewBrutalSender(congestion.ByteCount(refBPS))
-		})
-	if err != nil {
-		log.Fatalln("Client initialization failed:", err)
-	}
-	defer client.Close()
-	log.Println("Connected to", config.ServerAddr)
-
-	socks5server, err := socks5.NewServer(config.SOCKS5Addr, "", nil, config.SOCKS5Timeout, 0, 0)
-	if err != nil {
-		log.Fatalln("SOCKS5 server initialization failed:", err)
-	}
-	log.Println("SOCKS5 server up and running on", config.SOCKS5Addr)
-
-	log.Fatalln(socks5server.ListenAndServe(&socks5.HyHandler{
-		Client: client,
-		NewTCPRequestFunc: func(addr, reqAddr string) {
-			log.Printf("[TCP] %s <-> %s\n", addr, reqAddr)
-		},
-		TCPRequestClosedFunc: func(addr, reqAddr string, err error) {
-			log.Printf("Closed [TCP] %s <-> %s: %s\n", addr, reqAddr, err.Error())
-		},
-	}))
-}

cmd/proxy_config.go

@@ -1,71 +0,0 @@
-package main
-
-import "errors"
-
-const proxyTLSProtocol = "hysteria-proxy"
-
-type proxyClientConfig struct {
-	SOCKS5Addr        string `json:"socks5_addr" desc:"SOCKS5 listen address"`
-	SOCKS5Timeout     int    `json:"socks5_timeout" desc:"SOCKS5 connection timeout in seconds"`
-	ServerAddr        string `json:"server" desc:"Server address"`
-	Username          string `json:"username" desc:"Authentication username"`
-	Password          string `json:"password" desc:"Authentication password"`
-	Insecure          bool   `json:"insecure" desc:"Ignore TLS certificate errors"`
-	CustomCAFile      string `json:"ca" desc:"Specify a trusted CA file"`
-	UpMbps            int    `json:"up_mbps" desc:"Upload speed in Mbps"`
-	DownMbps          int    `json:"down_mbps" desc:"Download speed in Mbps"`
-	ReceiveWindowConn uint64 `json:"recv_window_conn" desc:"Max receive window size per connection"`
-	ReceiveWindow     uint64 `json:"recv_window" desc:"Max receive window size"`
-}
-
-func (c *proxyClientConfig) Check() error {
-	if len(c.SOCKS5Addr) == 0 {
-		return errors.New("no SOCKS5 listen address")
-	}
-	if c.SOCKS5Timeout != 0 && c.SOCKS5Timeout <= 4 {
-		return errors.New("invalid SOCKS5 timeout")
-	}
-	if len(c.ServerAddr) == 0 {
-		return errors.New("no server address")
-	}
-	if c.UpMbps <= 0 || c.DownMbps <= 0 {
-		return errors.New("invalid speed")
-	}
-	if (c.ReceiveWindowConn != 0 && c.ReceiveWindowConn < 65536) ||
-		(c.ReceiveWindow != 0 && c.ReceiveWindow < 65536) {
-		return errors.New("invalid receive window size")
-	}
-	return nil
-}
-
-type proxyServerConfig struct {
-	ListenAddr          string `json:"listen" desc:"Server listen address"`
-	CertFile            string `json:"cert" desc:"TLS certificate file"`
-	KeyFile             string `json:"key" desc:"TLS key file"`
-	AuthFile            string `json:"auth" desc:"Authentication file"`
-	UpMbps              int    `json:"up_mbps" desc:"Max upload speed per client in Mbps"`
-	DownMbps            int    `json:"down_mbps" desc:"Max download speed per client in Mbps"`
-	ReceiveWindowConn   uint64 `json:"recv_window_conn" desc:"Max receive window size per connection"`
-	ReceiveWindowClient uint64 `json:"recv_window_client" desc:"Max receive window size per client"`
-	MaxConnClient       int    `json:"max_conn_client" desc:"Max simultaneous connections allowed per client"`
-}
-
-func (c *proxyServerConfig) Check() error {
-	if len(c.ListenAddr) == 0 {
-		return errors.New("no listen address")
-	}
-	if len(c.CertFile) == 0 || len(c.KeyFile) == 0 {
-		return errors.New("TLS cert or key not provided")
-	}
-	if c.UpMbps < 0 || c.DownMbps < 0 {
-		return errors.New("invalid speed")
-	}
-	if (c.ReceiveWindowConn != 0 && c.ReceiveWindowConn < 65536) ||
-		(c.ReceiveWindowClient != 0 && c.ReceiveWindowClient < 65536) {
-		return errors.New("invalid receive window size")
-	}
-	if c.MaxConnClient < 0 {
-		return errors.New("invalid max connections per client")
-	}
-	return nil
-}

cmd/proxy_server.go

@@ -1,144 +0,0 @@
-package main
-
-import (
-	"bufio"
-	"crypto/tls"
-	"github.com/lucas-clemente/quic-go"
-	"github.com/lucas-clemente/quic-go/congestion"
-	hyCongestion "github.com/tobyxdd/hysteria/pkg/congestion"
-	"github.com/tobyxdd/hysteria/pkg/core"
-	"io"
-	"log"
-	"net"
-	"os"
-	"strings"
-)
-
-func proxyServer(args []string) {
-	var config proxyServerConfig
-	err := loadConfig(&config, args)
-	if err != nil {
-		log.Fatalln("Unable to load configuration:", err)
-	}
-	if err := config.Check(); err != nil {
-		log.Fatalln("Configuration error:", err.Error())
-	}
-	log.Printf("Configuration loaded: %+v\n", config)
-	// Load cert
-	cert, err := tls.LoadX509KeyPair(config.CertFile, config.KeyFile)
-	if err != nil {
-		log.Fatalln("Unable to load the certificate:", err)
-	}
-	tlsConfig := &tls.Config{
-		Certificates: []tls.Certificate{cert},
-		NextProtos:   []string{proxyTLSProtocol},
-		MinVersion:   tls.VersionTLS13,
-	}
-
-	quicConfig := &quic.Config{
-		MaxReceiveStreamFlowControlWindow:     config.ReceiveWindowConn,
-		MaxReceiveConnectionFlowControlWindow: config.ReceiveWindowClient,
-		MaxIncomingStreams:                    config.MaxConnClient,
-		KeepAlive:                             true,
-	}
-	if quicConfig.MaxReceiveStreamFlowControlWindow == 0 {
-		quicConfig.MaxReceiveStreamFlowControlWindow = DefaultMaxReceiveStreamFlowControlWindow
-	}
-	if quicConfig.MaxReceiveConnectionFlowControlWindow == 0 {
-		quicConfig.MaxReceiveConnectionFlowControlWindow = DefaultMaxReceiveConnectionFlowControlWindow
-	}
-	if quicConfig.MaxIncomingStreams == 0 {
-		quicConfig.MaxIncomingStreams = DefaultMaxIncomingStreams
-	}
-
-	if len(config.AuthFile) == 0 {
-		log.Println("WARNING: No authentication configured. This server can be used by anyone!")
-	}
-
-	server, err := core.NewServer(config.ListenAddr, tlsConfig, quicConfig,
-		uint64(config.UpMbps)*mbpsToBps, uint64(config.DownMbps)*mbpsToBps,
-		func(refBPS uint64) congestion.SendAlgorithmWithDebugInfos {
-			return hyCongestion.NewBrutalSender(congestion.ByteCount(refBPS))
-		},
-		func(addr net.Addr, username string, password string, sSend uint64, sRecv uint64) (core.AuthResult, string) {
-			if len(config.AuthFile) == 0 {
-				log.Printf("%s (%s) connected, negotiated speed (Mbps): Up %d / Down %d\n",
-					addr.String(), username, sSend/mbpsToBps, sRecv/mbpsToBps)
-				return core.AuthSuccess, ""
-			} else {
-				// Need auth
-				ok, err := checkAuth(config.AuthFile, username, password)
-				if err != nil {
-					log.Printf("%s (%s) auth error: %s\n", addr.String(), username, err.Error())
-					return core.AuthInternalError, "Server auth error"
-				}
-				if ok {
-					log.Printf("%s (%s) authenticated, negotiated speed (Mbps): Up %d / Down %d\n",
-						addr.String(), username, sSend/mbpsToBps, sRecv/mbpsToBps)
-					return core.AuthSuccess, ""
-				} else {
-					log.Printf("%s (%s) auth failed (invalid credential)\n", addr.String(), username)
-					return core.AuthInvalidCred, "Invalid credential"
-				}
-			}
-		},
-		func(addr net.Addr, username string, err error) {
-			log.Printf("%s (%s) disconnected: %s\n", addr.String(), username, err.Error())
-		},
-		func(addr net.Addr, username string, id int, packet bool, reqAddr string) (core.ConnectResult, string, io.ReadWriteCloser) {
-			if !packet {
-				// TCP
-				log.Printf("%s (%s): [TCP] %s\n", addr.String(), username, reqAddr)
-				conn, err := net.Dial("tcp", reqAddr)
-				if err != nil {
-					log.Printf("TCP error %s: %s\n", reqAddr, err.Error())
-					return core.ConnFailed, err.Error(), nil
-				}
-				return core.ConnSuccess, "", conn
-			} else {
-				// UDP
-				log.Printf("%s (%s): [UDP] %s\n", addr.String(), username, reqAddr)
-				conn, err := net.Dial("udp", reqAddr)
-				if err != nil {
-					log.Printf("UDP error %s: %s\n", reqAddr, err.Error())
-					return core.ConnFailed, err.Error(), nil
-				}
-				return core.ConnSuccess, "", conn
-			}
-		},
-		func(addr net.Addr, username string, id int, packet bool, reqAddr string, err error) {
-			if !packet {
-				log.Printf("%s (%s): closed [TCP] %s: %s\n", addr.String(), username, reqAddr, err.Error())
-			} else {
-				log.Printf("%s (%s): closed [UDP] %s: %s\n", addr.String(), username, reqAddr, err.Error())
-			}
-		},
-	)
-	if err != nil {
-		log.Fatalln("Server initialization failed:", err)
-	}
-	defer server.Close()
-	log.Println("Up and running on", config.ListenAddr)
-
-	log.Fatalln(server.Serve())
-}
-
-func checkAuth(authFile, username, password string) (bool, error) {
-	f, err := os.Open(authFile)
-	if err != nil {
-		return false, err
-	}
-	defer f.Close()
-	scanner := bufio.NewScanner(f)
-	for scanner.Scan() {
-		pair := strings.Fields(scanner.Text())
-		if len(pair) != 2 {
-			// Invalid format
-			continue
-		}
-		if username == pair[0] && password == pair[1] {
-			return true, nil
-		}
-	}
-	return false, nil
-}

cmd/relay_client.go

@@ -1,104 +0,0 @@
-package main
-
-import (
-	"crypto/tls"
-	"crypto/x509"
-	"github.com/lucas-clemente/quic-go"
-	"github.com/lucas-clemente/quic-go/congestion"
-	"github.com/tobyxdd/hysteria/internal/utils"
-	hyCongestion "github.com/tobyxdd/hysteria/pkg/congestion"
-	"github.com/tobyxdd/hysteria/pkg/core"
-	"io/ioutil"
-	"log"
-	"net"
-	"os/user"
-)
-
-func relayClient(args []string) {
-	var config relayClientConfig
-	err := loadConfig(&config, args)
-	if err != nil {
-		log.Fatalln("Unable to load configuration:", err)
-	}
-	if err := config.Check(); err != nil {
-		log.Fatalln("Configuration error:", err)
-	}
-	if len(config.Name) == 0 {
-		usr, err := user.Current()
-		if err == nil {
-			config.Name = usr.Name
-		}
-	}
-	log.Printf("Configuration loaded: %+v\n", config)
-
-	tlsConfig := &tls.Config{
-		NextProtos: []string{relayTLSProtocol},
-		MinVersion: tls.VersionTLS13,
-	}
-	// Load CA
-	if len(config.CustomCAFile) > 0 {
-		bs, err := ioutil.ReadFile(config.CustomCAFile)
-		if err != nil {
-			log.Fatalln("Unable to load CA file:", err)
-		}
-		cp := x509.NewCertPool()
-		if !cp.AppendCertsFromPEM(bs) {
-			log.Fatalln("Unable to parse CA file", config.CustomCAFile)
-		}
-		tlsConfig.RootCAs = cp
-	}
-
-	quicConfig := &quic.Config{
-		MaxReceiveStreamFlowControlWindow:     config.ReceiveWindowConn,
-		MaxReceiveConnectionFlowControlWindow: config.ReceiveWindow,
-		KeepAlive:                             true,
-	}
-	if quicConfig.MaxReceiveStreamFlowControlWindow == 0 {
-		quicConfig.MaxReceiveStreamFlowControlWindow = DefaultMaxReceiveStreamFlowControlWindow
-	}
-	if quicConfig.MaxReceiveConnectionFlowControlWindow == 0 {
-		quicConfig.MaxReceiveConnectionFlowControlWindow = DefaultMaxReceiveConnectionFlowControlWindow
-	}
-
-	client, err := core.NewClient(config.ServerAddr, config.Name, "", tlsConfig, quicConfig,
-		uint64(config.UpMbps)*mbpsToBps, uint64(config.DownMbps)*mbpsToBps,
-		func(refBPS uint64) congestion.SendAlgorithmWithDebugInfos {
-			return hyCongestion.NewBrutalSender(congestion.ByteCount(refBPS))
-		})
-	if err != nil {
-		log.Fatalln("Client initialization failed:", err)
-	}
-	defer client.Close()
-	log.Println("Connected to", config.ServerAddr)
-
-	listener, err := net.Listen("tcp", config.ListenAddr)
-	if err != nil {
-		log.Fatalln("TCP listen failed:", err)
-	}
-	defer listener.Close()
-	log.Println("TCP listening on", listener.Addr().String())
-
-	for {
-		conn, err := listener.Accept()
-		if err != nil {
-			log.Fatalln("TCP accept failed:", err)
-		}
-		go relayClientHandleConn(conn, client)
-	}
-}
-
-func relayClientHandleConn(conn net.Conn, client core.Client) {
-	log.Println("New connection", conn.RemoteAddr().String())
-	var closeErr error
-	defer func() {
-		_ = conn.Close()
-		log.Println("Connection", conn.RemoteAddr().String(), "closed", closeErr)
-	}()
-	rwc, err := client.Dial(false, "")
-	if err != nil {
-		closeErr = err
-		return
-	}
-	defer rwc.Close()
-	closeErr = utils.PipePair(conn, rwc, nil, nil)
-}

cmd/relay_config.go

@@ -1,69 +0,0 @@
-package main
-
-import "errors"
-
-const relayTLSProtocol = "hysteria-relay"
-
-type relayClientConfig struct {
-	ListenAddr        string `json:"listen" desc:"TCP listen address"`
-	ServerAddr        string `json:"server" desc:"Server address"`
-	Name              string `json:"name" desc:"Client name presented to the server"`
-	Insecure          bool   `json:"insecure" desc:"Ignore TLS certificate errors"`
-	CustomCAFile      string `json:"ca" desc:"Specify a trusted CA file"`
-	UpMbps            int    `json:"up_mbps" desc:"Upload speed in Mbps"`
-	DownMbps          int    `json:"down_mbps" desc:"Download speed in Mbps"`
-	ReceiveWindowConn uint64 `json:"recv_window_conn" desc:"Max receive window size per connection"`
-	ReceiveWindow     uint64 `json:"recv_window" desc:"Max receive window size"`
-}
-
-func (c *relayClientConfig) Check() error {
-	if len(c.ListenAddr) == 0 {
-		return errors.New("no listen address")
-	}
-	if len(c.ServerAddr) == 0 {
-		return errors.New("no server address")
-	}
-	if c.UpMbps <= 0 || c.DownMbps <= 0 {
-		return errors.New("invalid speed")
-	}
-	if (c.ReceiveWindowConn != 0 && c.ReceiveWindowConn < 65536) ||
-		(c.ReceiveWindow != 0 && c.ReceiveWindow < 65536) {
-		return errors.New("invalid receive window size")
-	}
-	return nil
-}
-
-type relayServerConfig struct {
-	ListenAddr          string `json:"listen" desc:"Server listen address"`
-	RemoteAddr          string `json:"remote" desc:"Remote relay address"`
-	CertFile            string `json:"cert" desc:"TLS certificate file"`
-	KeyFile             string `json:"key" desc:"TLS key file"`
-	UpMbps              int    `json:"up_mbps" desc:"Max upload speed per client in Mbps"`
-	DownMbps            int    `json:"down_mbps" desc:"Max download speed per client in Mbps"`
-	ReceiveWindowConn   uint64 `json:"recv_window_conn" desc:"Max receive window size per connection"`
-	ReceiveWindowClient uint64 `json:"recv_window_client" desc:"Max receive window size per client"`
-	MaxConnClient       int    `json:"max_conn_client" desc:"Max simultaneous connections allowed per client"`
-}
-
-func (c *relayServerConfig) Check() error {
-	if len(c.ListenAddr) == 0 {
-		return errors.New("no listen address")
-	}
-	if len(c.RemoteAddr) == 0 {
-		return errors.New("no remote address")
-	}
-	if len(c.CertFile) == 0 || len(c.KeyFile) == 0 {
-		return errors.New("TLS cert or key not provided")
-	}
-	if c.UpMbps < 0 || c.DownMbps < 0 {
-		return errors.New("invalid speed")
-	}
-	if (c.ReceiveWindowConn != 0 && c.ReceiveWindowConn < 65536) ||
-		(c.ReceiveWindowClient != 0 && c.ReceiveWindowClient < 65536) {
-		return errors.New("invalid receive window size")
-	}
-	if c.MaxConnClient < 0 {
-		return errors.New("invalid max connections per client")
-	}
-	return nil
-}

cmd/relay_server.go

@@ -1,88 +0,0 @@
-package main
-
-import (
-	"crypto/tls"
-	"github.com/lucas-clemente/quic-go"
-	"github.com/lucas-clemente/quic-go/congestion"
-	hyCongestion "github.com/tobyxdd/hysteria/pkg/congestion"
-	"github.com/tobyxdd/hysteria/pkg/core"
-	"io"
-	"log"
-	"net"
-)
-
-func relayServer(args []string) {
-	var config relayServerConfig
-	err := loadConfig(&config, args)
-	if err != nil {
-		log.Fatalln("Unable to load configuration:", err)
-	}
-	if err := config.Check(); err != nil {
-		log.Fatalln("Configuration error:", err.Error())
-	}
-	log.Printf("Configuration loaded: %+v\n", config)
-	// Load cert
-	cert, err := tls.LoadX509KeyPair(config.CertFile, config.KeyFile)
-	if err != nil {
-		log.Fatalln("Unable to load the certificate:", err)
-	}
-	tlsConfig := &tls.Config{
-		Certificates: []tls.Certificate{cert},
-		NextProtos:   []string{relayTLSProtocol},
-		MinVersion:   tls.VersionTLS13,
-	}
-
-	quicConfig := &quic.Config{
-		MaxReceiveStreamFlowControlWindow:     config.ReceiveWindowConn,
-		MaxReceiveConnectionFlowControlWindow: config.ReceiveWindowClient,
-		MaxIncomingStreams:                    config.MaxConnClient,
-		KeepAlive:                             true,
-	}
-	if quicConfig.MaxReceiveStreamFlowControlWindow == 0 {
-		quicConfig.MaxReceiveStreamFlowControlWindow = DefaultMaxReceiveStreamFlowControlWindow
-	}
-	if quicConfig.MaxReceiveConnectionFlowControlWindow == 0 {
-		quicConfig.MaxReceiveConnectionFlowControlWindow = DefaultMaxReceiveConnectionFlowControlWindow
-	}
-	if quicConfig.MaxIncomingStreams == 0 {
-		quicConfig.MaxIncomingStreams = DefaultMaxIncomingStreams
-	}
-
-	server, err := core.NewServer(config.ListenAddr, tlsConfig, quicConfig,
-		uint64(config.UpMbps)*mbpsToBps, uint64(config.DownMbps)*mbpsToBps,
-		func(refBPS uint64) congestion.SendAlgorithmWithDebugInfos {
-			return hyCongestion.NewBrutalSender(congestion.ByteCount(refBPS))
-		},
-		func(addr net.Addr, username string, password string, sSend uint64, sRecv uint64) (core.AuthResult, string) {
-			// No authentication logic in relay, just log username and speed
-			log.Printf("%s (%s) connected, negotiated speed (Mbps): Up %d / Down %d\n",
-				addr.String(), username, sSend/mbpsToBps, sRecv/mbpsToBps)
-			return core.AuthSuccess, ""
-		},
-		func(addr net.Addr, username string, err error) {
-			log.Printf("%s (%s) disconnected: %s\n", addr.String(), username, err.Error())
-		},
-		func(addr net.Addr, username string, id int, packet bool, reqAddr string) (core.ConnectResult, string, io.ReadWriteCloser) {
-			log.Printf("%s (%s): new stream ID %d\n", addr.String(), username, id)
-			if packet {
-				return core.ConnBlocked, "unsupported", nil
-			}
-			conn, err := net.Dial("tcp", config.RemoteAddr)
-			if err != nil {
-				log.Printf("TCP error %s: %s\n", config.RemoteAddr, err.Error())
-				return core.ConnFailed, err.Error(), nil
-			}
-			return core.ConnSuccess, "", conn
-		},
-		func(addr net.Addr, username string, id int, packet bool, reqAddr string, err error) {
-			log.Printf("%s (%s): closed stream ID %d: %s\n", addr.String(), username, id, err.Error())
-		},
-	)
-	if err != nil {
-		log.Fatalln("Server initialization failed:", err)
-	}
-	defer server.Close()
-	log.Println("Up and running on", config.ListenAddr)
-
-	log.Fatalln(server.Serve())
-}

cmd/server.json

@@ -1,9 +0,0 @@
-{
-  "listen": ":36712",
-  "remote": "localhost:1080",
-  "cert": "/home/ubuntu/.caddy/acme/acme-v02.api.letsencrypt.org/sites/toby.moe/toby.moe.crt",
-  "key": "/home/ubuntu/.caddy/acme/acme-v02.api.letsencrypt.org/sites/toby.moe/toby.moe.key",
-  "up_mbps": 100,
-  "down_mbps": 100,
-  "max_conn_client": 200
-}

cmd/utils.go

@@ -1,28 +0,0 @@
-package main
-
-import (
-	"strconv"
-)
-
-type optionalBoolFlag struct {
-	Exists bool
-	Value  bool
-}
-
-func (flag *optionalBoolFlag) String() string {
-	return strconv.FormatBool(flag.Value)
-}
-
-func (flag *optionalBoolFlag) Set(s string) error {
-	v, err := strconv.ParseBool(s)
-	if err != nil {
-		return err
-	}
-	flag.Exists = true
-	flag.Value = v
-	return nil
-}
-
-func (flag *optionalBoolFlag) IsBoolFlag() bool {
-	return true
-}

core/LICENSE.md

@@ -0,0 +1,7 @@
+Copyright 2023 Toby
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

core/client/.mockery.yaml

@@ -0,0 +1,9 @@
+with-expecter: true
+inpackage: true
+dir: .
+packages:
+  github.com/apernet/hysteria/core/v2/client:
+    interfaces:
+      udpIO:
+        config:
+          mockname: mockUDPIO

core/client/client.go

@@ -0,0 +1,315 @@
+package client
+
+import (
+	"context"
+	"crypto/tls"
+	"net"
+	"net/http"
+	"net/url"
+	"time"
+
+	coreErrs "github.com/apernet/hysteria/core/v2/errors"
+	"github.com/apernet/hysteria/core/v2/internal/congestion"
+	"github.com/apernet/hysteria/core/v2/internal/protocol"
+	"github.com/apernet/hysteria/core/v2/internal/utils"
+
+	"github.com/apernet/quic-go"
+	"github.com/apernet/quic-go/http3"
+)
+
+const (
+	closeErrCodeOK            = 0x100 // HTTP3 ErrCodeNoError
+	closeErrCodeProtocolError = 0x101 // HTTP3 ErrCodeGeneralProtocolError
+)
+
+type Client interface {
+	TCP(addr string) (net.Conn, error)
+	UDP() (HyUDPConn, error)
+	Close() error
+}
+
+type HyUDPConn interface {
+	Receive() ([]byte, string, error)
+	Send([]byte, string) error
+	Close() error
+}
+
+type HandshakeInfo struct {
+	UDPEnabled bool
+	Tx         uint64 // 0 if using BBR
+}
+
+func NewClient(config *Config) (Client, *HandshakeInfo, error) {
+	if err := config.verifyAndFill(); err != nil {
+		return nil, nil, err
+	}
+	c := &clientImpl{
+		config: config,
+	}
+	info, err := c.connect()
+	if err != nil {
+		return nil, nil, err
+	}
+	return c, info, nil
+}
+
+type clientImpl struct {
+	config *Config
+
+	pktConn net.PacketConn
+	conn    quic.Connection
+
+	udpSM *udpSessionManager
+}
+
+func (c *clientImpl) connect() (*HandshakeInfo, error) {
+	pktConn, err := c.config.ConnFactory.New(c.config.ServerAddr)
+	if err != nil {
+		return nil, err
+	}
+	// Convert config to TLS config & QUIC config
+	tlsConfig := &tls.Config{
+		ServerName:            c.config.TLSConfig.ServerName,
+		InsecureSkipVerify:    c.config.TLSConfig.InsecureSkipVerify,
+		VerifyPeerCertificate: c.config.TLSConfig.VerifyPeerCertificate,
+		RootCAs:               c.config.TLSConfig.RootCAs,
+	}
+	quicConfig := &quic.Config{
+		InitialStreamReceiveWindow:     c.config.QUICConfig.InitialStreamReceiveWindow,
+		MaxStreamReceiveWindow:         c.config.QUICConfig.MaxStreamReceiveWindow,
+		InitialConnectionReceiveWindow: c.config.QUICConfig.InitialConnectionReceiveWindow,
+		MaxConnectionReceiveWindow:     c.config.QUICConfig.MaxConnectionReceiveWindow,
+		MaxIdleTimeout:                 c.config.QUICConfig.MaxIdleTimeout,
+		KeepAlivePeriod:                c.config.QUICConfig.KeepAlivePeriod,
+		DisablePathMTUDiscovery:        c.config.QUICConfig.DisablePathMTUDiscovery,
+		EnableDatagrams:                true,
+	}
+	// Prepare RoundTripper
+	var conn quic.EarlyConnection
+	rt := &http3.RoundTripper{
+		TLSClientConfig: tlsConfig,
+		QUICConfig:      quicConfig,
+		Dial: func(ctx context.Context, _ string, tlsCfg *tls.Config, cfg *quic.Config) (quic.EarlyConnection, error) {
+			qc, err := quic.DialEarly(ctx, pktConn, c.config.ServerAddr, tlsCfg, cfg)
+			if err != nil {
+				return nil, err
+			}
+			conn = qc
+			return qc, nil
+		},
+	}
+	// Send auth HTTP request
+	req := &http.Request{
+		Method: http.MethodPost,
+		URL: &url.URL{
+			Scheme: "https",
+			Host:   protocol.URLHost,
+			Path:   protocol.URLPath,
+		},
+		Header: make(http.Header),
+	}
+	protocol.AuthRequestToHeader(req.Header, protocol.AuthRequest{
+		Auth: c.config.Auth,
+		Rx:   c.config.BandwidthConfig.MaxRx,
+	})
+	resp, err := rt.RoundTrip(req)
+	if err != nil {
+		if conn != nil {
+			_ = conn.CloseWithError(closeErrCodeProtocolError, "")
+		}
+		_ = pktConn.Close()
+		return nil, coreErrs.ConnectError{Err: err}
+	}
+	if resp.StatusCode != protocol.StatusAuthOK {
+		_ = conn.CloseWithError(closeErrCodeProtocolError, "")
+		_ = pktConn.Close()
+		return nil, coreErrs.AuthError{StatusCode: resp.StatusCode}
+	}
+	// Auth OK
+	authResp := protocol.AuthResponseFromHeader(resp.Header)
+	var actualTx uint64
+	if authResp.RxAuto {
+		// Server asks client to use bandwidth detection,
+		// ignore local bandwidth config and use BBR
+		congestion.UseBBR(conn)
+	} else {
+		// actualTx = min(serverRx, clientTx)
+		actualTx = authResp.Rx
+		if actualTx == 0 || actualTx > c.config.BandwidthConfig.MaxTx {
+			// Server doesn't have a limit, or our clientTx is smaller than serverRx
+			actualTx = c.config.BandwidthConfig.MaxTx
+		}
+		if actualTx > 0 {
+			congestion.UseBrutal(conn, actualTx)
+		} else {
+			// We don't know our own bandwidth either, use BBR
+			congestion.UseBBR(conn)
+		}
+	}
+	_ = resp.Body.Close()
+
+	c.pktConn = pktConn
+	c.conn = conn
+	if authResp.UDPEnabled {
+		c.udpSM = newUDPSessionManager(&udpIOImpl{Conn: conn})
+	}
+	return &HandshakeInfo{
+		UDPEnabled: authResp.UDPEnabled,
+		Tx:         actualTx,
+	}, nil
+}
+
+// openStream wraps the stream with QStream, which handles Close() properly
+func (c *clientImpl) openStream() (quic.Stream, error) {
+	stream, err := c.conn.OpenStream()
+	if err != nil {
+		return nil, err
+	}
+	return &utils.QStream{Stream: stream}, nil
+}
+
+func (c *clientImpl) TCP(addr string) (net.Conn, error) {
+	stream, err := c.openStream()
+	if err != nil {
+		return nil, wrapIfConnectionClosed(err)
+	}
+	// Send request
+	err = protocol.WriteTCPRequest(stream, addr)
+	if err != nil {
+		_ = stream.Close()
+		return nil, wrapIfConnectionClosed(err)
+	}
+	if c.config.FastOpen {
+		// Don't wait for the response when fast open is enabled.
+		// Return the connection immediately, defer the response handling
+		// to the first Read() call.
+		return &tcpConn{
+			Orig:             stream,
+			PseudoLocalAddr:  c.conn.LocalAddr(),
+			PseudoRemoteAddr: c.conn.RemoteAddr(),
+			Established:      false,
+		}, nil
+	}
+	// Read response
+	ok, msg, err := protocol.ReadTCPResponse(stream)
+	if err != nil {
+		_ = stream.Close()
+		return nil, wrapIfConnectionClosed(err)
+	}
+	if !ok {
+		_ = stream.Close()
+		return nil, coreErrs.DialError{Message: msg}
+	}
+	return &tcpConn{
+		Orig:             stream,
+		PseudoLocalAddr:  c.conn.LocalAddr(),
+		PseudoRemoteAddr: c.conn.RemoteAddr(),
+		Established:      true,
+	}, nil
+}
+
+func (c *clientImpl) UDP() (HyUDPConn, error) {
+	if c.udpSM == nil {
+		return nil, coreErrs.DialError{Message: "UDP not enabled"}
+	}
+	return c.udpSM.NewUDP()
+}
+
+func (c *clientImpl) Close() error {
+	_ = c.conn.CloseWithError(closeErrCodeOK, "")
+	_ = c.pktConn.Close()
+	return nil
+}
+
+// wrapIfConnectionClosed checks if the error returned by quic-go
+// indicates that the QUIC connection has been permanently closed,
+// and if so, wraps the error with coreErrs.ClosedError.
+// PITFALL: sometimes quic-go has "internal errors" that are not net.Error,
+// but we still need to treat them as ClosedError.
+func wrapIfConnectionClosed(err error) error {
+	netErr, ok := err.(net.Error)
+	if !ok || !netErr.Temporary() {
+		return coreErrs.ClosedError{Err: err}
+	} else {
+		return err
+	}
+}
+
+type tcpConn struct {
+	Orig             quic.Stream
+	PseudoLocalAddr  net.Addr
+	PseudoRemoteAddr net.Addr
+	Established      bool
+}
+
+func (c *tcpConn) Read(b []byte) (n int, err error) {
+	if !c.Established {
+		// Read response
+		ok, msg, err := protocol.ReadTCPResponse(c.Orig)
+		if err != nil {
+			return 0, err
+		}
+		if !ok {
+			return 0, coreErrs.DialError{Message: msg}
+		}
+		c.Established = true
+	}
+	return c.Orig.Read(b)
+}
+
+func (c *tcpConn) Write(b []byte) (n int, err error) {
+	return c.Orig.Write(b)
+}
+
+func (c *tcpConn) Close() error {
+	return c.Orig.Close()
+}
+
+func (c *tcpConn) LocalAddr() net.Addr {
+	return c.PseudoLocalAddr
+}
+
+func (c *tcpConn) RemoteAddr() net.Addr {
+	return c.PseudoRemoteAddr
+}
+
+func (c *tcpConn) SetDeadline(t time.Time) error {
+	return c.Orig.SetDeadline(t)
+}
+
+func (c *tcpConn) SetReadDeadline(t time.Time) error {
+	return c.Orig.SetReadDeadline(t)
+}
+
+func (c *tcpConn) SetWriteDeadline(t time.Time) error {
+	return c.Orig.SetWriteDeadline(t)
+}
+
+type udpIOImpl struct {
+	Conn quic.Connection
+}
+
+func (io *udpIOImpl) ReceiveMessage() (*protocol.UDPMessage, error) {
+	for {
+		msg, err := io.Conn.ReceiveDatagram(context.Background())
+		if err != nil {
+			// Connection error, this will stop the session manager
+			return nil, err
+		}
+		udpMsg, err := protocol.ParseUDPMessage(msg)
+		if err != nil {
+			// Invalid message, this is fine - just wait for the next
+			continue
+		}
+		return udpMsg, nil
+	}
+}
+
+func (io *udpIOImpl) SendMessage(buf []byte, msg *protocol.UDPMessage) error {
+	msgN := msg.Serialize(buf)
+	if msgN < 0 {
+		// Message larger than buffer, silent drop
+		return nil
+	}
+	return io.Conn.SendDatagram(buf[:msgN])
+}