Chore: update dependencies

Co-authored-by: goomada <madao@DESKTOP-IOEBS0C.localdomain>

.github/ISSUE_TEMPLATE/bug_report.md

@@ -7,48 +7,54 @@ assignees: ''
 
 ---
 
-<!-- The English version is available. -->
+<!--
 感谢你向 Clash Core 提交 issue！
 在提交之前，请确认：
 
-- [ ] 我已经在 [Issue Tracker](……/) 中找过我要提出的问题
-- [ ] 这是 Clash 核心的问题，并非我所使用的 Clash 衍生版本（如 Openclash、Koolclash 等）的特定问题
-- [ ] 我已经使用 Clash core 的 dev 分支版本测试过，问题依旧存在
 - [ ] 如果你可以自己 debug 并解决的话，提交 PR 吧！
+- [ ] 我已经在 [Issue Tracker](……/) 中找过我要提出的问题
+- [ ] 我已经使用 dev 分支版本测试过，问题依旧存在
+- [ ] 我已经仔细看过 [Documentation](https://github.com/Dreamacro/clash/wiki/) 并无法自行解决问题
+- [ ] 这是 Clash 核心的问题，并非我所使用的 Clash 衍生版本（如 OpenClash、KoolClash 等）的特定问题
 
 请注意，如果你并没有遵照这个 issue template 填写内容，我们将直接关闭这个 issue。
 
-<!--
-Thanks for submitting an issue towards the Clash core!
+Thanks for opening an issue towards the Clash core!
 But before so, please do the following checklist:
 
 - [ ] Is this something you can **debug and fix**? Send a pull request! Bug fixes and documentation fixes are welcome.
-- [ ] Your issue may already be reported! Please search on the [issue tracker](……/) before creating one.
+- [ ] I have searched on the [issue tracker](……/) for a related issue.
 - [ ] I have tested using the dev branch, and the issue still exists.
-- [ ] This is an issue related to the Clash core, not to the derivatives of Clash, like Openclash or Koolclash
+- [ ] I have read the [documentation](https://github.com/Dreamacro/clash/wiki/) and was unable to solve the issue
+- [ ] This is an issue of the Clash core *per se*, not to the derivatives of Clash, like OpenClash or KoolClash
 
-Please understand that we close issues that fail to follow the issue template.
+Please understand that we close issues that fail to follow this issue template.
 -->
 
-我都确认过了，我要继续提交。
-<!-- None of the above, create a bug report -->
 ------------------------------------------------------------------
 
+<!-- 
 请附上任何可以帮助我们解决这个问题的信息，如果我们收到的信息不足，我们将对这个 issue 加上 *Needs more information* 标记并在收到更多资讯之前关闭 issue。
-<!-- Make sure to add **all the information needed to understand the bug** so that someone can help. If the info is missing we'll add the 'Needs more information' label and close the issue until there is enough information. -->
+Make sure to add **all the information needed to understand the bug** so that someone can help. If the info is missing we'll add the 'Needs more information' label and close the issue until there is enough information.
+-->
 
-### clash core config
+### Clash config
 <!--
 在下方附上 Clash core 脱敏后配置文件的内容
 Paste the Clash core configuration below.
 -->
-```
+<details>
+  <summary>config.yaml</summary>
+
+```yaml
 ……
 ```
 
+</details>
+
 ### Clash log
 <!--
-在下方附上 Clash Core 的日志，log level 最好使用 DEBUG
+在下方附上 Clash Core 的日志，log level 使用 DEBUG
 Paste the Clash core log below with the log level set to `DEBUG`.
 -->
 ```
@@ -57,9 +63,7 @@ Paste the Clash core log below with the log level set to `DEBUG`.
 
 ### 环境 Environment
 
-* Clash Core 的操作系统 (the OS that the Clash core is running on)
-……
-* 使用者的操作系统 (the OS running on the client)
+* 操作系统 (the OS that the Clash core is running on)
 ……
 * 网路环境或拓扑 (network conditions/topology)
 ……
@@ -67,7 +71,7 @@ Paste the Clash core log below with the log level set to `DEBUG`.
 ……
 * ISP 有没有进行 DNS 污染 (is your ISP performing DNS pollution?)
 ……
-* 其他
+* 其他 (any other information that would be useful)
 ……
 
 ### 说明 Description
@@ -85,7 +89,7 @@ Paste the Clash core log below with the log level set to `DEBUG`.
 **我预期会发生……？**
 <!-- **Expected behavior:** [What you expected to happen] -->
 
-**实际上发生了什麽？**
+**实际上发生了什么？**
 <!-- **Actual behavior:** [What actually happened] -->
 
 ### 可能的解决方案 Possible Solution

.github/workflows/docker.yml

@@ -17,37 +17,60 @@ jobs:
         with:
           fetch-depth: 0
 
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v1
+        with:
+          platforms: all
+
       - name: Set up docker buildx
         id: buildx
-        uses: crazy-max/ghaction-docker-buildx@v2
+        uses: docker/setup-buildx-action@v1
         with:
-          buildx-version: latest
-          skip-cache: false
-          qemu-version: latest
+          version: latest
 
-      - name: Docker login
-        env:
-          DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
-          DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
-        run: |
-          echo "${DOCKER_PASSWORD}" | docker login --username "${DOCKER_USERNAME}" --password-stdin
+      - name: Login to DockerHub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
       
-      - name: Docker buildx image and push on dev branch
+      - name: Login to Github Package
+        uses: docker/login-action@v1
+        with:
+          registry: ghcr.io
+          username: Dreamacro
+          password: ${{ secrets.PACKAGE_TOKEN }}
+
+      - name: Build dev branch and push
         if: github.ref == 'refs/heads/dev'
-        run: |
-          docker buildx build --output "type=image,push=true" --platform=linux/amd64,linux/arm/v7,linux/arm64 --tag dreamacro/clash:dev .
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
+          push: true
+          tags: 'dreamacro/clash:dev,ghcr.io/dreamacro/clash:dev'
 
-      - name: Replace tag without `v`
+      - name: Get all docker tags
         if: startsWith(github.ref, 'refs/tags/')
-        uses: actions/github-script@v1
-        id: version
+        uses: actions/github-script@v3
+        id: tags
         with:
           script: |
-            return context.payload.ref.replace(/\/?refs\/tags\/v/, '')
+            const ref = `${context.payload.ref.replace(/\/?refs\/tags\//, '')}`
+            const tags = [
+              'dreamacro/clash:latest',
+              `dreamacro/clash:${ref}`,
+              'ghcr.io/dreamacro/clash:latest',
+              `ghcr.io/dreamacro/clash:${ref}`
+            ]
+            return tags.join(',')
           result-encoding: string
 
-      - name: Docker buildx image and push on release
+      - name: Build release and push
         if: startsWith(github.ref, 'refs/tags/')
-        run: |
-          docker buildx build --output "type=image,push=true" --platform=linux/amd64,linux/arm/v7,linux/arm64 --tag dreamacro/clash:${{steps.version.outputs.result}} .
-          docker buildx build --output "type=image,push=true" --platform=linux/amd64,linux/arm/v7,linux/arm64 --tag dreamacro/clash:latest .
+        uses: docker/build-push-action@v2
+        with:
+          context: .
+          platforms: linux/amd64,linux/arm/v7,linux/arm64
+          push: true
+          tags: ${{steps.tags.outputs.result}}

.github/workflows/go.yml

@@ -9,7 +9,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v2
         with:
-          go-version: 1.14.x
+          go-version: 1.16
 
       - name: Check out code into the Go module directory
         uses: actions/checkout@v2
@@ -22,9 +22,12 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-go-
 
-      - name: Get dependencies and run test
+      - name: Get dependencies, run test and static check
         run: |
           go test ./...
+          go vet ./...
+          go get -u honnef.co/go/tools/cmd/staticcheck
+          staticcheck -- $(go list ./...)
 
       - name: Build
         if: startsWith(github.ref, 'refs/tags/')

.github/workflows/stale.yml

@@ -0,0 +1,19 @@
+  
+name: Mark stale issues and pull requests
+
+on:
+  schedule:
+    - cron: "30 1 * * *"
+
+jobs:
+  stale:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/stale@v3
+        with:
+          repo-token: ${{ secrets.GITHUB_TOKEN }}
+          stale-issue-message: 'This issue is stale because it has been open 60 days with no activity. Remove stale label or comment or this will be closed in 5 days'
+          days-before-stale: 60
+          days-before-close: 5

Dockerfile

@@ -10,6 +10,7 @@ RUN go mod download && \
     mv ./bin/clash-docker /clash
 
 FROM alpine:latest
+LABEL org.opencontainers.image.source="https://github.com/Dreamacro/clash"
 
 RUN apk add --no-cache ca-certificates
 COPY --from=builder /Country.mmdb /root/.config/clash/

Makefile

@@ -4,10 +4,11 @@ VERSION=$(shell git describe --tags || echo "unknown version")
 BUILDTIME=$(shell date -u)
 GOBUILD=CGO_ENABLED=0 go build -trimpath -ldflags '-X "github.com/Dreamacro/clash/constant.Version=$(VERSION)" \
 		-X "github.com/Dreamacro/clash/constant.BuildTime=$(BUILDTIME)" \
-		-w -s'
+		-w -s -buildid='
 
 PLATFORM_LIST = \
 	darwin-amd64 \
+	darwin-arm64 \
 	linux-386 \
 	linux-amd64 \
 	linux-armv5 \
@@ -25,7 +26,8 @@ PLATFORM_LIST = \
 
 WINDOWS_ARCH_LIST = \
 	windows-386 \
-	windows-amd64
+	windows-amd64 \
+	windows-arm32v7
 
 all: linux-amd64 darwin-amd64 windows-amd64 # Most used
 
@@ -35,6 +37,9 @@ docker:
 darwin-amd64:
 	GOARCH=amd64 GOOS=darwin $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
 
+darwin-arm64:
+	GOARCH=arm64 GOOS=darwin $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
 linux-386:
 	GOARCH=386 GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
 
@@ -83,6 +88,9 @@ windows-386:
 windows-amd64:
 	GOARCH=amd64 GOOS=windows $(GOBUILD) -o $(BINDIR)/$(NAME)-$@.exe
 	
+windows-arm32v7:
+	GOARCH=arm GOOS=windows GOARM=7 $(GOBUILD) -o $(BINDIR)/$(NAME)-$@.exe
+
 gz_releases=$(addsuffix .gz, $(PLATFORM_LIST))
 zip_releases=$(addsuffix .zip, $(WINDOWS_ARCH_LIST))
 

README.md

@@ -19,372 +19,36 @@
 
 ## Features
 
-- Local HTTP/HTTPS/SOCKS server with/without authentication
-- VMess, Shadowsocks, Trojan (experimental), Snell protocol support for remote connections. UDP is supported.
-- Built-in DNS server that aims to minimize DNS pollution attacks, supports DoH/DoT upstream. Fake IP is also supported.
+- Local HTTP/HTTPS/SOCKS server with authentication support
+- VMess, Shadowsocks, Trojan, Snell protocol support for remote connections
+- Built-in DNS server that aims to minimize DNS pollution attack impact, supports DoH/DoT upstream and fake IP.
 - Rules based off domains, GEOIP, IP CIDR or ports to forward packets to different nodes
 - Remote groups allow users to implement powerful rules. Supports automatic fallback, load balancing or auto select node based off latency
 - Remote providers, allowing users to get node lists remotely instead of hardcoding in config
-- Netfilter TCP redirecting. You can deploy Clash on your Internet gateway with `iptables`.
-- Comprehensive HTTP API controller
+- Netfilter TCP redirecting. Deploy Clash on your Internet gateway with `iptables`.
+- Comprehensive HTTP RESTful API controller
 
-## Install
+## Premium Features
 
-Clash requires Go >= 1.13. You can build it from source:
+- TUN mode on macOS, Linux and Windows. [Doc](https://github.com/Dreamacro/clash/wiki/premium-core-features#tun-device)
+- Match your tunnel by [Script](https://github.com/Dreamacro/clash/wiki/premium-core-features#script)
+- [Rule Provider](https://github.com/Dreamacro/clash/wiki/premium-core-features#rule-providers)
 
-```sh
-$ go get -u -v github.com/Dreamacro/clash
-```
+## Getting Started
+Documentations are now moved to [GitHub Wiki](https://github.com/Dreamacro/clash/wiki).
 
-Pre-built binaries are available here: [release](https://github.com/Dreamacro/clash/releases)  
-Pre-built Premium binaries are available here: [premium release](https://github.com/Dreamacro/clash/releases/tag/premium). Source is not currently available.
-
-Check Clash version with:
-
-```sh
-$ clash -v
-```
-
-## Daemonize Clash
-
-We recommend using third-party daemon management tools like PM2, Supervisor or the like to keep Clash running as a service. ([Wiki](https://github.com/Dreamacro/clash/wiki/Clash-as-a-daemon))
-
-In the case of [pm2](https://github.com/Unitech/pm2), start the daemon this way:
-
-```sh
-$ pm2 start clash
-```
-
-If you have Docker installed, it's recommended to deploy Clash directly using `docker-compose`: [run Clash in Docker](https://github.com/Dreamacro/clash/wiki/Run-clash-in-docker)
-
-## Config
-
-The default configuration directory is `$HOME/.config/clash`.
-
-The name of the configuration file is `config.yaml`.
-
-If you want to use another directory, use `-d` to control the configuration directory.
-
-For example, you can use the current directory as the configuration directory:
-
-```sh
-$ clash -d .
-```
-
-<details>
-  <summary>This is an example configuration file (click to expand)</summary>
-
-```yml
-# port of HTTP
-port: 7890
-
-# port of SOCKS5
-socks-port: 7891
-
-# (HTTP and SOCKS5 in one port)
-# mixed-port: 7890
-
-# redir port for Linux and macOS
-# redir-port: 7892
-
-allow-lan: false
-
-# Only applicable when setting allow-lan to true
-# "*": bind all IP addresses
-# 192.168.122.11: bind a single IPv4 address
-# "[aaaa::a8aa:ff:fe09:57d8]": bind a single IPv6 address
-# bind-address: "*"
-
-# ipv6: false # when ipv6 is false, each clash dial with ipv6, but it's not affect the response of the dns server, default is false
-
-# rule / global / direct (default is rule)
-mode: rule
-
-# set log level to stdout (default is info)
-# info / warning / error / debug / silent
-log-level: info
-
-# RESTful API for clash
-external-controller: 127.0.0.1:9090
-
-# you can put the static web resource (such as clash-dashboard) to a directory, and clash would serve in `${API}/ui`
-# input is a relative path to the configuration directory or an absolute path
-# external-ui: folder
-
-# Secret for RESTful API (Optional)
-# secret: ""
-
-# interface-name: en0 # outbound interface name
-
-# authentication of local SOCKS5/HTTP(S) server
-# authentication:
-#  - "user1:pass1"
-#  - "user2:pass2"
-
-# # hosts, support wildcard (e.g. *.clash.dev Even *.foo.*.example.com)
-# # static domain has a higher priority than wildcard domain (foo.example.com > *.example.com > .example.com)
-# # +.foo.com equal .foo.com and foo.com
-# hosts:
-#   '*.clash.dev': 127.0.0.1
-#   '.dev': 127.0.0.1
-#   'alpha.clash.dev': '::1'
-#   '+.foo.dev': 127.0.0.1
-
-# dns:
-  # enable: true # set true to enable dns (default is false)
-  # ipv6: false # it only affect the dns server response, default is false
-  # listen: 0.0.0.0:53
-  # # default-nameserver: # resolve dns nameserver host, should fill pure IP
-  # #   - 114.114.114.114
-  # #   - 8.8.8.8
-  # enhanced-mode: redir-host # or fake-ip
-  # # fake-ip-range: 198.18.0.1/16 # if you don't know what it is, don't change it
-  # fake-ip-filter: # fake ip white domain list
-  #   - '*.lan'
-  #   - localhost.ptlogin2.qq.com
-  # nameserver:
-  #   - 114.114.114.114
-  #   - tls://dns.rubyfish.cn:853 # dns over tls
-  #   - https://1.1.1.1/dns-query # dns over https
-  # fallback: # concurrent request with nameserver, fallback used when GEOIP country isn't CN
-  #   - tcp://1.1.1.1
-  # fallback-filter:
-  #   geoip: true # default
-  #   ipcidr: # ips in these subnets will be considered polluted
-  #     - 240.0.0.0/4
-
-proxies:
-  # shadowsocks
-  # The supported ciphers(encrypt methods):
-  #   aes-128-gcm aes-192-gcm aes-256-gcm
-  #   aes-128-cfb aes-192-cfb aes-256-cfb
-  #   aes-128-ctr aes-192-ctr aes-256-ctr
-  #   rc4-md5 chacha20-ietf xchacha20
-  #   chacha20-ietf-poly1305 xchacha20-ietf-poly1305
-  - name: "ss1"
-    type: ss
-    server: server
-    port: 443
-    cipher: chacha20-ietf-poly1305
-    password: "password"
-    # udp: true
-
-  - name: "ss2"
-    type: ss
-    server: server
-    port: 443
-    cipher: chacha20-ietf-poly1305
-    password: "password"
-    plugin: obfs
-    plugin-opts:
-      mode: tls # or http
-      # host: bing.com
-
-  - name: "ss3"
-    type: ss
-    server: server
-    port: 443
-    cipher: chacha20-ietf-poly1305
-    password: "password"
-    plugin: v2ray-plugin
-    plugin-opts:
-      mode: websocket # no QUIC now
-      # tls: true # wss
-      # skip-cert-verify: true
-      # host: bing.com
-      # path: "/"
-      # mux: true
-      # headers:
-      #   custom: value
-
-  # vmess
-  # cipher support auto/aes-128-gcm/chacha20-poly1305/none
-  - name: "vmess"
-    type: vmess
-    server: server
-    port: 443
-    uuid: uuid
-    alterId: 32
-    cipher: auto
-    # udp: true
-    # tls: true
-    # skip-cert-verify: true
-    # servername: example.com # priority over wss host
-    # network: ws
-    # ws-path: /path
-    # ws-headers:
-    #   Host: v2ray.com
-  
-  - name: "vmess-http"
-    type: vmess
-    server: server
-    port: 443
-    uuid: uuid
-    alterId: 32
-    cipher: auto
-    # udp: true
-    # network: http
-    # http-opts:
-    #   # method: "GET"
-    #   # path:
-    #   #   - '/'
-    #   #   - '/video'
-    #   # headers:
-    #   #   Connection:
-    #   #     - keep-alive
-
-  # socks5
-  - name: "socks"
-    type: socks5
-    server: server
-    port: 443
-    # username: username
-    # password: password
-    # tls: true
-    # skip-cert-verify: true
-    # udp: true
-
-  # http
-  - name: "http"
-    type: http
-    server: server
-    port: 443
-    # username: username
-    # password: password
-    # tls: true # https
-    # skip-cert-verify: true
-
-  # snell
-  - name: "snell"
-    type: snell
-    server: server
-    port: 44046
-    psk: yourpsk
-    # obfs-opts:
-      # mode: http # or tls
-      # host: bing.com
-
-  # trojan
-  - name: "trojan"
-    type: trojan
-    server: server
-    port: 443
-    password: yourpsk
-    # udp: true
-    # sni: example.com # aka server name
-    # alpn:
-    #   - h2
-    #   - http/1.1
-    # skip-cert-verify: true
-
-proxy-groups:
-  # relay chains the proxies. proxies shall not contain a relay. No UDP support.
-  # Traffic: clash <-> http <-> vmess <-> ss1 <-> ss2 <-> Internet
-  - name: "relay"
-    type: relay
-    proxies:
-      - http
-      - vmess
-      - ss1
-      - ss2
-
-  # url-test select which proxy will be used by benchmarking speed to a URL.
-  - name: "auto"
-    type: url-test
-    proxies:
-      - ss1
-      - ss2
-      - vmess1
-    # tolerance: 150
-    url: 'http://www.gstatic.com/generate_204'
-    interval: 300
-
-  # fallback select an available policy by priority. The availability is tested by accessing an URL, just like an auto url-test group.
-  - name: "fallback-auto"
-    type: fallback
-    proxies:
-      - ss1
-      - ss2
-      - vmess1
-    url: 'http://www.gstatic.com/generate_204'
-    interval: 300
-
-  # load-balance: The request of the same eTLD will be dial on the same proxy.
-  - name: "load-balance"
-    type: load-balance
-    proxies:
-      - ss1
-      - ss2
-      - vmess1
-    url: 'http://www.gstatic.com/generate_204'
-    interval: 300
-
-  # select is used for selecting proxy or proxy group
-  # you can use RESTful API to switch proxy, is recommended for use in GUI.
-  - name: Proxy
-    type: select
-    proxies:
-      - ss1
-      - ss2
-      - vmess1
-      - auto
-  
-  - name: UseProvider
-    type: select
-    use:
-      - provider1
-    proxies:
-      - Proxy
-      - DIRECT
-
-proxy-providers:
-  provider1:
-    type: http
-    url: "url"
-    interval: 3600
-    path: ./hk.yaml
-    health-check:
-      enable: true
-      interval: 600
-      url: http://www.gstatic.com/generate_204
-  test:
-    type: file
-    path: /test.yaml
-    health-check:
-      enable: true
-      interval: 36000
-      url: http://www.gstatic.com/generate_204
-
-rules:
-  - DOMAIN-SUFFIX,google.com,auto
-  - DOMAIN-KEYWORD,google,auto
-  - DOMAIN,google.com,auto
-  - DOMAIN-SUFFIX,ad.com,REJECT
-  # rename SOURCE-IP-CIDR and would remove after prerelease
-  - SRC-IP-CIDR,192.168.1.201/32,DIRECT
-  # optional param "no-resolve" for IP rules (GEOIP IP-CIDR)
-  - IP-CIDR,127.0.0.0/8,DIRECT
-  - GEOIP,CN,DIRECT
-  - DST-PORT,80,DIRECT
-  - SRC-PORT,7777,DIRECT
-  - MATCH,auto
-```
-</details>
-
-## Advanced
-[Provider](https://github.com/Dreamacro/clash/wiki/Provider)
-
-## Documentations
-https://clash.gitbook.io/
+## Premium Release
+[Release](https://github.com/Dreamacro/clash/releases/tag/premium)
 
 ## Credits
 
-[riobard/go-shadowsocks2](https://github.com/riobard/go-shadowsocks2)
-
-[v2ray/v2ray-core](https://github.com/v2ray/v2ray-core)
+* [riobard/go-shadowsocks2](https://github.com/riobard/go-shadowsocks2)
+* [v2ray/v2ray-core](https://github.com/v2ray/v2ray-core)
 
 ## License
 
+This software is released under the GPL-3.0 license.
+
 [![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2FDreamacro%2Fclash.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2FDreamacro%2Fclash?ref=badge_large)
 
 ## TODO
@@ -393,4 +57,4 @@ https://clash.gitbook.io/
 - [x] Redir proxy
 - [x] UDP support
 - [x] Connection manager
-- ~~[ ] Event API~~
+- [ ] ~~Event API~~

adapters/inbound/http.go

@@ -6,33 +6,18 @@ import (
 	"strings"
 
 	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/context"
 )
 
-// HTTPAdapter is a adapter for HTTP connection
-type HTTPAdapter struct {
-	net.Conn
-	metadata *C.Metadata
-	R        *http.Request
-}
-
-// Metadata return destination metadata
-func (h *HTTPAdapter) Metadata() *C.Metadata {
-	return h.metadata
-}
-
-// NewHTTP is HTTPAdapter generator
-func NewHTTP(request *http.Request, conn net.Conn) *HTTPAdapter {
+// NewHTTP recieve normal http request and return HTTPContext
+func NewHTTP(request *http.Request, conn net.Conn) *context.HTTPContext {
 	metadata := parseHTTPAddr(request)
 	metadata.Type = C.HTTP
 	if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {
 		metadata.SrcIP = ip
 		metadata.SrcPort = port
 	}
-	return &HTTPAdapter{
-		metadata: metadata,
-		R:        request,
-		Conn:     conn,
-	}
+	return context.NewHTTPContext(conn, request, metadata)
 }
 
 // RemoveHopByHopHeaders remove hop-by-hop header

adapters/inbound/https.go

@@ -5,18 +5,16 @@ import (
 	"net/http"
 
 	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/context"
 )
 
-// NewHTTPS is HTTPAdapter generator
-func NewHTTPS(request *http.Request, conn net.Conn) *SocketAdapter {
+// NewHTTPS recieve CONNECT request and return ConnContext
+func NewHTTPS(request *http.Request, conn net.Conn) *context.ConnContext {
 	metadata := parseHTTPAddr(request)
 	metadata.Type = C.HTTPCONNECT
 	if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {
 		metadata.SrcIP = ip
 		metadata.SrcPort = port
 	}
-	return &SocketAdapter{
-		metadata: metadata,
-		Conn:     conn,
-	}
+	return context.NewConnContext(conn, metadata)
 }

adapters/inbound/socket.go

@@ -5,21 +5,11 @@ import (
 
 	"github.com/Dreamacro/clash/component/socks5"
 	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/context"
 )
 
-// SocketAdapter is a adapter for socks and redir connection
-type SocketAdapter struct {
-	net.Conn
-	metadata *C.Metadata
-}
-
-// Metadata return destination metadata
-func (s *SocketAdapter) Metadata() *C.Metadata {
-	return s.metadata
-}
-
-// NewSocket is SocketAdapter generator
-func NewSocket(target socks5.Addr, conn net.Conn, source C.Type) *SocketAdapter {
+// NewSocket recieve TCP inbound and return ConnContext
+func NewSocket(target socks5.Addr, conn net.Conn, source C.Type) *context.ConnContext {
 	metadata := parseSocksAddr(target)
 	metadata.NetWork = C.TCP
 	metadata.Type = source
@@ -28,8 +18,5 @@ func NewSocket(target socks5.Addr, conn net.Conn, source C.Type) *SocketAdapter
 		metadata.SrcPort = port
 	}
 
-	return &SocketAdapter{
-		Conn:     conn,
-		metadata: metadata,
-	}
+	return context.NewConnContext(conn, metadata)
 }

adapters/outbound/base.go

@@ -10,10 +10,8 @@ import (
 
 	"github.com/Dreamacro/clash/common/queue"
 	C "github.com/Dreamacro/clash/constant"
-)
 
-var (
-	defaultURLTestTimeout = time.Second * 5
+	"go.uber.org/atomic"
 )
 
 type Base struct {
@@ -98,11 +96,11 @@ func newPacketConn(pc net.PacketConn, a C.ProxyAdapter) C.PacketConn {
 type Proxy struct {
 	C.ProxyAdapter
 	history *queue.Queue
-	alive   bool
+	alive   *atomic.Bool
 }
 
 func (p *Proxy) Alive() bool {
-	return p.alive
+	return p.alive.Load()
 }
 
 func (p *Proxy) Dial(metadata *C.Metadata) (C.Conn, error) {
@@ -114,7 +112,7 @@ func (p *Proxy) Dial(metadata *C.Metadata) (C.Conn, error) {
 func (p *Proxy) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
 	conn, err := p.ProxyAdapter.DialContext(ctx, metadata)
 	if err != nil {
-		p.alive = false
+		p.alive.Store(false)
 	}
 	return conn, err
 }
@@ -131,7 +129,7 @@ func (p *Proxy) DelayHistory() []C.DelayHistory {
 // LastDelay return last history record. if proxy is not alive, return the max value of uint16.
 func (p *Proxy) LastDelay() (delay uint16) {
 	var max uint16 = 0xffff
-	if !p.alive {
+	if !p.alive.Load() {
 		return max
 	}
 
@@ -162,7 +160,7 @@ func (p *Proxy) MarshalJSON() ([]byte, error) {
 // URLTest get the delay for the specified URL
 func (p *Proxy) URLTest(ctx context.Context, url string) (t uint16, err error) {
 	defer func() {
-		p.alive = err == nil
+		p.alive.Store(err == nil)
 		record := C.DelayHistory{Time: time.Now()}
 		if err == nil {
 			record.Delay = t
@@ -218,5 +216,5 @@ func (p *Proxy) URLTest(ctx context.Context, url string) (t uint16, err error) {
 }
 
 func NewProxy(adapter C.ProxyAdapter) *Proxy {
-	return &Proxy{adapter, queue.New(10), true}
+	return &Proxy{adapter, queue.New(10), atomic.NewBool(true)}
 }

adapters/outbound/http.go

@@ -31,6 +31,7 @@ type HttpOption struct {
 	UserName       string `proxy:"username,omitempty"`
 	Password       string `proxy:"password,omitempty"`
 	TLS            bool   `proxy:"tls,omitempty"`
+	SNI            string `proxy:"sni,omitempty"`
 	SkipCertVerify bool   `proxy:"skip-cert-verify,omitempty"`
 }
 
@@ -114,10 +115,14 @@ func (h *Http) shakeHand(metadata *C.Metadata, rw io.ReadWriter) error {
 func NewHttp(option HttpOption) *Http {
 	var tlsConfig *tls.Config
 	if option.TLS {
+		sni := option.Server
+		if option.SNI != "" {
+			sni = option.SNI
+		}
 		tlsConfig = &tls.Config{
 			InsecureSkipVerify: option.SkipCertVerify,
 			ClientSessionCache: getClientSessionCache(),
-			ServerName:         option.Server,
+			ServerName:         sni,
 		}
 	}
 

adapters/outbound/parser.go

@@ -11,11 +11,13 @@ func ParseProxy(mapping map[string]interface{}) (C.Proxy, error) {
 	decoder := structure.NewDecoder(structure.Option{TagName: "proxy", WeaklyTypedInput: true})
 	proxyType, existType := mapping["type"].(string)
 	if !existType {
-		return nil, fmt.Errorf("Missing type")
+		return nil, fmt.Errorf("missing type")
 	}
 
-	var proxy C.ProxyAdapter
-	err := fmt.Errorf("Cannot parse")
+	var (
+		proxy C.ProxyAdapter
+		err   error
+	)
 	switch proxyType {
 	case "ss":
 		ssOption := &ShadowSocksOption{}
@@ -24,6 +26,13 @@ func ParseProxy(mapping map[string]interface{}) (C.Proxy, error) {
 			break
 		}
 		proxy, err = NewShadowSocks(*ssOption)
+	case "ssr":
+		ssrOption := &ShadowSocksROption{}
+		err = decoder.Decode(mapping, ssrOption)
+		if err != nil {
+			break
+		}
+		proxy, err = NewShadowSocksR(*ssrOption)
 	case "socks5":
 		socksOption := &Socks5Option{}
 		err = decoder.Decode(mapping, socksOption)
@@ -65,7 +74,7 @@ func ParseProxy(mapping map[string]interface{}) (C.Proxy, error) {
 		}
 		proxy, err = NewTrojan(*trojanOption)
 	default:
-		return nil, fmt.Errorf("Unsupport proxy type: %s", proxyType)
+		return nil, fmt.Errorf("unsupport proxy type: %s", proxyType)
 	}
 
 	if err != nil {

adapters/outbound/shadowsocks.go

@@ -40,7 +40,7 @@ type ShadowSocksOption struct {
 }
 
 type simpleObfsOption struct {
-	Mode string `obfs:"mode"`
+	Mode string `obfs:"mode,omitempty"`
 	Host string `obfs:"host,omitempty"`
 }
 

adapters/outbound/shadowsocksr.go

@@ -0,0 +1,148 @@
+package outbound
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net"
+	"strconv"
+
+	"github.com/Dreamacro/clash/component/dialer"
+	"github.com/Dreamacro/clash/component/ssr/obfs"
+	"github.com/Dreamacro/clash/component/ssr/protocol"
+	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/go-shadowsocks2/core"
+	"github.com/Dreamacro/go-shadowsocks2/shadowaead"
+	"github.com/Dreamacro/go-shadowsocks2/shadowstream"
+)
+
+type ShadowSocksR struct {
+	*Base
+	cipher   core.Cipher
+	obfs     obfs.Obfs
+	protocol protocol.Protocol
+}
+
+type ShadowSocksROption struct {
+	Name          string `proxy:"name"`
+	Server        string `proxy:"server"`
+	Port          int    `proxy:"port"`
+	Password      string `proxy:"password"`
+	Cipher        string `proxy:"cipher"`
+	Obfs          string `proxy:"obfs"`
+	ObfsParam     string `proxy:"obfs-param,omitempty"`
+	Protocol      string `proxy:"protocol"`
+	ProtocolParam string `proxy:"protocol-param,omitempty"`
+	UDP           bool   `proxy:"udp,omitempty"`
+}
+
+func (ssr *ShadowSocksR) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
+	c = ssr.obfs.StreamConn(c)
+	c = ssr.cipher.StreamConn(c)
+	var (
+		iv  []byte
+		err error
+	)
+	switch conn := c.(type) {
+	case *shadowstream.Conn:
+		iv, err = conn.ObtainWriteIV()
+		if err != nil {
+			return nil, err
+		}
+	case *shadowaead.Conn:
+		return nil, fmt.Errorf("invalid connection type")
+	}
+	c = ssr.protocol.StreamConn(c, iv)
+	_, err = c.Write(serializesSocksAddr(metadata))
+	return c, err
+}
+
+func (ssr *ShadowSocksR) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	c, err := dialer.DialContext(ctx, "tcp", ssr.addr)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", ssr.addr, err)
+	}
+	tcpKeepAlive(c)
+
+	c, err = ssr.StreamConn(c, metadata)
+	return NewConn(c, ssr), err
+}
+
+func (ssr *ShadowSocksR) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	pc, err := dialer.ListenPacket("udp", "")
+	if err != nil {
+		return nil, err
+	}
+
+	addr, err := resolveUDPAddr("udp", ssr.addr)
+	if err != nil {
+		return nil, err
+	}
+
+	pc = ssr.cipher.PacketConn(pc)
+	pc = ssr.protocol.PacketConn(pc)
+	return newPacketConn(&ssPacketConn{PacketConn: pc, rAddr: addr}, ssr), nil
+}
+
+func (ssr *ShadowSocksR) MarshalJSON() ([]byte, error) {
+	return json.Marshal(map[string]string{
+		"type": ssr.Type().String(),
+	})
+}
+
+func NewShadowSocksR(option ShadowSocksROption) (*ShadowSocksR, error) {
+	addr := net.JoinHostPort(option.Server, strconv.Itoa(option.Port))
+	cipher := option.Cipher
+	password := option.Password
+	coreCiph, err := core.PickCipher(cipher, nil, password)
+	if err != nil {
+		return nil, fmt.Errorf("ssr %s initialize error: %w", addr, err)
+	}
+	var (
+		ivSize int
+		key    []byte
+	)
+	if option.Cipher == "dummy" {
+		ivSize = 0
+		key = core.Kdf(option.Password, 16)
+	} else {
+		ciph, ok := coreCiph.(*core.StreamCipher)
+		if !ok {
+			return nil, fmt.Errorf("%s is not dummy or a supported stream cipher in ssr", cipher)
+		}
+		ivSize = ciph.IVSize()
+		key = ciph.Key
+	}
+
+	obfs, obfsOverhead, err := obfs.PickObfs(option.Obfs, &obfs.Base{
+		Host:   option.Server,
+		Port:   option.Port,
+		Key:    key,
+		IVSize: ivSize,
+		Param:  option.ObfsParam,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("ssr %s initialize obfs error: %w", addr, err)
+	}
+
+	protocol, err := protocol.PickProtocol(option.Protocol, &protocol.Base{
+		Key:      key,
+		Overhead: obfsOverhead,
+		Param:    option.ProtocolParam,
+	})
+	if err != nil {
+		return nil, fmt.Errorf("ssr %s initialize protocol error: %w", addr, err)
+	}
+
+	return &ShadowSocksR{
+		Base: &Base{
+			name: option.Name,
+			addr: addr,
+			tp:   C.ShadowsocksR,
+			udp:  option.UDP,
+		},
+		cipher:   coreCiph,
+		obfs:     obfs,
+		protocol: protocol,
+	}, nil
+}

adapters/outbound/snell.go

@@ -16,7 +16,9 @@ import (
 type Snell struct {
 	*Base
 	psk        []byte
+	pool       *snell.Pool
 	obfsOption *simpleObfsOption
+	version    int
 }
 
 type SnellOption struct {
@@ -24,24 +26,47 @@ type SnellOption struct {
 	Server   string                 `proxy:"server"`
 	Port     int                    `proxy:"port"`
 	Psk      string                 `proxy:"psk"`
+	Version  int                    `proxy:"version,omitempty"`
 	ObfsOpts map[string]interface{} `proxy:"obfs-opts,omitempty"`
 }
 
-func (s *Snell) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
-	switch s.obfsOption.Mode {
+type streamOption struct {
+	psk        []byte
+	version    int
+	addr       string
+	obfsOption *simpleObfsOption
+}
+
+func streamConn(c net.Conn, option streamOption) *snell.Snell {
+	switch option.obfsOption.Mode {
 	case "tls":
-		c = obfs.NewTLSObfs(c, s.obfsOption.Host)
+		c = obfs.NewTLSObfs(c, option.obfsOption.Host)
 	case "http":
-		_, port, _ := net.SplitHostPort(s.addr)
-		c = obfs.NewHTTPObfs(c, s.obfsOption.Host, port)
+		_, port, _ := net.SplitHostPort(option.addr)
+		c = obfs.NewHTTPObfs(c, option.obfsOption.Host, port)
 	}
-	c = snell.StreamConn(c, s.psk)
+	return snell.StreamConn(c, option.psk, option.version)
+}
+
+func (s *Snell) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
+	c = streamConn(c, streamOption{s.psk, s.version, s.addr, s.obfsOption})
 	port, _ := strconv.Atoi(metadata.DstPort)
-	err := snell.WriteHeader(c, metadata.String(), uint(port))
+	err := snell.WriteHeader(c, metadata.String(), uint(port), s.version)
 	return c, err
 }
 
 func (s *Snell) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	if s.version == snell.Version2 {
+		c, err := s.pool.Get()
+		if err != nil {
+			return nil, err
+		}
+
+		port, _ := strconv.Atoi(metadata.DstPort)
+		err = snell.WriteHeader(c, metadata.String(), uint(port), s.version)
+		return NewConn(c, s), err
+	}
+
 	c, err := dialer.DialContext(ctx, "tcp", s.addr)
 	if err != nil {
 		return nil, fmt.Errorf("%s connect error: %w", s.addr, err)
@@ -62,11 +87,22 @@ func NewSnell(option SnellOption) (*Snell, error) {
 		return nil, fmt.Errorf("snell %s initialize obfs error: %w", addr, err)
 	}
 
-	if obfsOption.Mode != "tls" && obfsOption.Mode != "http" {
+	switch obfsOption.Mode {
+	case "tls", "http", "":
+		break
+	default:
 		return nil, fmt.Errorf("snell %s obfs mode error: %s", addr, obfsOption.Mode)
 	}
 
-	return &Snell{
+	// backward compatible
+	if option.Version == 0 {
+		option.Version = snell.DefaultSnellVersion
+	}
+	if option.Version != snell.Version1 && option.Version != snell.Version2 {
+		return nil, fmt.Errorf("snell version error: %d", option.Version)
+	}
+
+	s := &Snell{
 		Base: &Base{
 			name: option.Name,
 			addr: addr,
@@ -74,5 +110,19 @@ func NewSnell(option SnellOption) (*Snell, error) {
 		},
 		psk:        psk,
 		obfsOption: obfsOption,
-	}, nil
+		version:    option.Version,
+	}
+
+	if option.Version == snell.Version2 {
+		s.pool = snell.NewPool(func(ctx context.Context) (*snell.Snell, error) {
+			c, err := dialer.DialContext(ctx, "tcp", addr)
+			if err != nil {
+				return nil, err
+			}
+
+			tcpKeepAlive(c)
+			return streamConn(c, streamOption{psk, option.Version, addr, obfsOption}), nil
+		})
+	}
+	return s, nil
 }

adapters/outbound/socks5.go

@@ -122,7 +122,21 @@ func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, err error) {
 		pc.Close()
 	}()
 
-	return newPacketConn(&socksPacketConn{PacketConn: pc, rAddr: bindAddr.UDPAddr(), tcpConn: c}, ss), nil
+	// Support unspecified UDP bind address.
+	bindUDPAddr := bindAddr.UDPAddr()
+	if bindUDPAddr == nil {
+		err = errors.New("invalid UDP bind address")
+		return
+	} else if bindUDPAddr.IP.IsUnspecified() {
+		serverAddr, err := resolveUDPAddr("udp", ss.Addr())
+		if err != nil {
+			return nil, err
+		}
+
+		bindUDPAddr.IP = serverAddr.IP
+	}
+
+	return newPacketConn(&socksPacketConn{PacketConn: pc, rAddr: bindUDPAddr, tcpConn: c}, ss), nil
 }
 
 func NewSocks5(option Socks5Option) *Socks5 {

adapters/outbound/vmess.go

@@ -32,6 +32,7 @@ type VmessOption struct {
 	UDP            bool              `proxy:"udp,omitempty"`
 	Network        string            `proxy:"network,omitempty"`
 	HTTPOpts       HTTPOptions       `proxy:"http-opts,omitempty"`
+	HTTP2Opts      HTTP2Options      `proxy:"h2-opts,omitempty"`
 	WSPath         string            `proxy:"ws-path,omitempty"`
 	WSHeaders      map[string]string `proxy:"ws-headers,omitempty"`
 	SkipCertVerify bool              `proxy:"skip-cert-verify,omitempty"`
@@ -44,6 +45,11 @@ type HTTPOptions struct {
 	Headers map[string][]string `proxy:"headers,omitempty"`
 }
 
+type HTTP2Options struct {
+	Host []string `proxy:"host,omitempty"`
+	Path string   `proxy:"path,omitempty"`
+}
+
 func (v *Vmess) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
 	var err error
 	switch v.option.Network {
@@ -71,6 +77,25 @@ func (v *Vmess) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
 		}
 		c, err = vmess.StreamWebsocketConn(c, wsOpts)
 	case "http":
+		// readability first, so just copy default TLS logic
+		if v.option.TLS {
+			host, _, _ := net.SplitHostPort(v.addr)
+			tlsOpts := &vmess.TLSConfig{
+				Host:           host,
+				SkipCertVerify: v.option.SkipCertVerify,
+				SessionCache:   getClientSessionCache(),
+			}
+
+			if v.option.ServerName != "" {
+				tlsOpts.Host = v.option.ServerName
+			}
+
+			c, err = vmess.StreamTLSConn(c, tlsOpts)
+			if err != nil {
+				return nil, err
+			}
+		}
+
 		host, _, _ := net.SplitHostPort(v.addr)
 		httpOpts := &vmess.HTTPConfig{
 			Host:    host,
@@ -80,6 +105,30 @@ func (v *Vmess) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
 		}
 
 		c = vmess.StreamHTTPConn(c, httpOpts)
+	case "h2":
+		host, _, _ := net.SplitHostPort(v.addr)
+		tlsOpts := vmess.TLSConfig{
+			Host:           host,
+			SkipCertVerify: v.option.SkipCertVerify,
+			SessionCache:   getClientSessionCache(),
+			NextProtos:     []string{"h2"},
+		}
+
+		if v.option.ServerName != "" {
+			tlsOpts.Host = v.option.ServerName
+		}
+
+		c, err = vmess.StreamTLSConn(c, &tlsOpts)
+		if err != nil {
+			return nil, err
+		}
+
+		h2Opts := &vmess.H2Config{
+			Hosts: v.option.HTTP2Opts.Host,
+			Path:  v.option.HTTP2Opts.Path,
+		}
+
+		c, err = vmess.StreamH2Conn(c, h2Opts)
 	default:
 		// handle TLS
 		if v.option.TLS {
@@ -152,13 +201,16 @@ func NewVmess(option VmessOption) (*Vmess, error) {
 	if err != nil {
 		return nil, err
 	}
+	if option.Network == "h2" && !option.TLS {
+		return nil, fmt.Errorf("TLS must be true with h2 network")
+	}
 
 	return &Vmess{
 		Base: &Base{
 			name: option.Name,
 			addr: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 			tp:   C.Vmess,
-			udp:  true,
+			udp:  option.UDP,
 		},
 		client: client,
 		option: &option,

adapters/outboundgroup/common.go

@@ -11,10 +11,14 @@ const (
 	defaultGetProxiesDuration = time.Second * 5
 )
 
-func getProvidersProxies(providers []provider.ProxyProvider) []C.Proxy {
+func getProvidersProxies(providers []provider.ProxyProvider, touch bool) []C.Proxy {
 	proxies := []C.Proxy{}
 	for _, provider := range providers {
-		proxies = append(proxies, provider.Proxies()...)
+		if touch {
+			proxies = append(proxies, provider.ProxiesWithTouch()...)
+		} else {
+			proxies = append(proxies, provider.Proxies()...)
+		}
 	}
 	return proxies
 }

adapters/outboundgroup/fallback.go

@@ -12,17 +12,18 @@ import (
 
 type Fallback struct {
 	*outbound.Base
-	single    *singledo.Single
-	providers []provider.ProxyProvider
+	disableUDP bool
+	single     *singledo.Single
+	providers  []provider.ProxyProvider
 }
 
 func (f *Fallback) Now() string {
-	proxy := f.findAliveProxy()
+	proxy := f.findAliveProxy(false)
 	return proxy.Name()
 }
 
 func (f *Fallback) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	proxy := f.findAliveProxy()
+	proxy := f.findAliveProxy(true)
 	c, err := proxy.DialContext(ctx, metadata)
 	if err == nil {
 		c.AppendToChains(f)
@@ -31,7 +32,7 @@ func (f *Fallback) DialContext(ctx context.Context, metadata *C.Metadata) (C.Con
 }
 
 func (f *Fallback) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
-	proxy := f.findAliveProxy()
+	proxy := f.findAliveProxy(true)
 	pc, err := proxy.DialUDP(metadata)
 	if err == nil {
 		pc.AppendToChains(f)
@@ -40,13 +41,17 @@ func (f *Fallback) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
 }
 
 func (f *Fallback) SupportUDP() bool {
-	proxy := f.findAliveProxy()
+	if f.disableUDP {
+		return false
+	}
+
+	proxy := f.findAliveProxy(false)
 	return proxy.SupportUDP()
 }
 
 func (f *Fallback) MarshalJSON() ([]byte, error) {
 	var all []string
-	for _, proxy := range f.proxies() {
+	for _, proxy := range f.proxies(false) {
 		all = append(all, proxy.Name())
 	}
 	return json.Marshal(map[string]interface{}{
@@ -57,33 +62,34 @@ func (f *Fallback) MarshalJSON() ([]byte, error) {
 }
 
 func (f *Fallback) Unwrap(metadata *C.Metadata) C.Proxy {
-	proxy := f.findAliveProxy()
+	proxy := f.findAliveProxy(true)
 	return proxy
 }
 
-func (f *Fallback) proxies() []C.Proxy {
+func (f *Fallback) proxies(touch bool) []C.Proxy {
 	elm, _, _ := f.single.Do(func() (interface{}, error) {
-		return getProvidersProxies(f.providers), nil
+		return getProvidersProxies(f.providers, touch), nil
 	})
 
 	return elm.([]C.Proxy)
 }
 
-func (f *Fallback) findAliveProxy() C.Proxy {
-	proxies := f.proxies()
+func (f *Fallback) findAliveProxy(touch bool) C.Proxy {
+	proxies := f.proxies(touch)
 	for _, proxy := range proxies {
 		if proxy.Alive() {
 			return proxy
 		}
 	}
 
-	return f.proxies()[0]
+	return proxies[0]
 }
 
-func NewFallback(name string, providers []provider.ProxyProvider) *Fallback {
+func NewFallback(options *GroupCommonOption, providers []provider.ProxyProvider) *Fallback {
 	return &Fallback{
-		Base:      outbound.NewBase(name, "", C.Fallback, false),
-		single:    singledo.NewSingle(defaultGetProxiesDuration),
-		providers: providers,
+		Base:       outbound.NewBase(options.Name, "", C.Fallback, false),
+		single:     singledo.NewSingle(defaultGetProxiesDuration),
+		providers:  providers,
+		disableUDP: options.DisableUDP,
 	}
 }

adapters/outboundgroup/loadbalance.go

@@ -3,6 +3,8 @@ package outboundgroup
 import (
 	"context"
 	"encoding/json"
+	"errors"
+	"fmt"
 	"net"
 
 	"github.com/Dreamacro/clash/adapters/outbound"
@@ -14,11 +16,25 @@ import (
 	"golang.org/x/net/publicsuffix"
 )
 
+type strategyFn = func(proxies []C.Proxy, metadata *C.Metadata) C.Proxy
+
 type LoadBalance struct {
 	*outbound.Base
-	single    *singledo.Single
-	maxRetry  int
-	providers []provider.ProxyProvider
+	disableUDP bool
+	single     *singledo.Single
+	providers  []provider.ProxyProvider
+	strategyFn strategyFn
+}
+
+var errStrategy = errors.New("unsupported strategy")
+
+func parseStrategy(config map[string]interface{}) string {
+	if elm, ok := config["strategy"]; ok {
+		if strategy, ok := elm.(string); ok {
+			return strategy
+		}
+	}
+	return "consistent-hashing"
 }
 
 func getKey(metadata *C.Metadata) string {
@@ -78,27 +94,50 @@ func (lb *LoadBalance) DialUDP(metadata *C.Metadata) (pc C.PacketConn, err error
 }
 
 func (lb *LoadBalance) SupportUDP() bool {
-	return true
+	return !lb.disableUDP
+}
+
+func strategyRoundRobin() strategyFn {
+	idx := 0
+	return func(proxies []C.Proxy, metadata *C.Metadata) C.Proxy {
+		length := len(proxies)
+		for i := 0; i < length; i++ {
+			idx = (idx + 1) % length
+			proxy := proxies[idx]
+			if proxy.Alive() {
+				return proxy
+			}
+		}
+
+		return proxies[0]
+	}
+}
+
+func strategyConsistentHashing() strategyFn {
+	maxRetry := 5
+	return func(proxies []C.Proxy, metadata *C.Metadata) C.Proxy {
+		key := uint64(murmur3.Sum32([]byte(getKey(metadata))))
+		buckets := int32(len(proxies))
+		for i := 0; i < maxRetry; i, key = i+1, key+1 {
+			idx := jumpHash(key, buckets)
+			proxy := proxies[idx]
+			if proxy.Alive() {
+				return proxy
+			}
+		}
+
+		return proxies[0]
+	}
 }
 
 func (lb *LoadBalance) Unwrap(metadata *C.Metadata) C.Proxy {
-	key := uint64(murmur3.Sum32([]byte(getKey(metadata))))
-	proxies := lb.proxies()
-	buckets := int32(len(proxies))
-	for i := 0; i < lb.maxRetry; i, key = i+1, key+1 {
-		idx := jumpHash(key, buckets)
-		proxy := proxies[idx]
-		if proxy.Alive() {
-			return proxy
-		}
-	}
-
-	return proxies[0]
+	proxies := lb.proxies(true)
+	return lb.strategyFn(proxies, metadata)
 }
 
-func (lb *LoadBalance) proxies() []C.Proxy {
+func (lb *LoadBalance) proxies(touch bool) []C.Proxy {
 	elm, _, _ := lb.single.Do(func() (interface{}, error) {
-		return getProvidersProxies(lb.providers), nil
+		return getProvidersProxies(lb.providers, touch), nil
 	})
 
 	return elm.([]C.Proxy)
@@ -106,7 +145,7 @@ func (lb *LoadBalance) proxies() []C.Proxy {
 
 func (lb *LoadBalance) MarshalJSON() ([]byte, error) {
 	var all []string
-	for _, proxy := range lb.proxies() {
+	for _, proxy := range lb.proxies(false) {
 		all = append(all, proxy.Name())
 	}
 	return json.Marshal(map[string]interface{}{
@@ -115,11 +154,21 @@ func (lb *LoadBalance) MarshalJSON() ([]byte, error) {
 	})
 }
 
-func NewLoadBalance(name string, providers []provider.ProxyProvider) *LoadBalance {
-	return &LoadBalance{
-		Base:      outbound.NewBase(name, "", C.LoadBalance, false),
-		single:    singledo.NewSingle(defaultGetProxiesDuration),
-		maxRetry:  3,
-		providers: providers,
+func NewLoadBalance(options *GroupCommonOption, providers []provider.ProxyProvider, strategy string) (lb *LoadBalance, err error) {
+	var strategyFn strategyFn
+	switch strategy {
+	case "consistent-hashing":
+		strategyFn = strategyConsistentHashing()
+	case "round-robin":
+		strategyFn = strategyRoundRobin()
+	default:
+		return nil, fmt.Errorf("%w: %s", errStrategy, strategy)
 	}
+	return &LoadBalance{
+		Base:       outbound.NewBase(options.Name, "", C.LoadBalance, false),
+		single:     singledo.NewSingle(defaultGetProxiesDuration),
+		providers:  providers,
+		strategyFn: strategyFn,
+		disableUDP: options.DisableUDP,
+	}, nil
 }

adapters/outboundgroup/parser.go

@@ -12,25 +12,28 @@ import (
 var (
 	errFormat            = errors.New("format error")
 	errType              = errors.New("unsupport type")
-	errMissUse           = errors.New("`use` field should not be empty")
 	errMissProxy         = errors.New("`use` or `proxies` missing")
 	errMissHealthCheck   = errors.New("`url` or `interval` missing")
 	errDuplicateProvider = errors.New("`duplicate provider name")
 )
 
 type GroupCommonOption struct {
-	Name     string   `group:"name"`
-	Type     string   `group:"type"`
-	Proxies  []string `group:"proxies,omitempty"`
-	Use      []string `group:"use,omitempty"`
-	URL      string   `group:"url,omitempty"`
-	Interval int      `group:"interval,omitempty"`
+	Name       string   `group:"name"`
+	Type       string   `group:"type"`
+	Proxies    []string `group:"proxies,omitempty"`
+	Use        []string `group:"use,omitempty"`
+	URL        string   `group:"url,omitempty"`
+	Interval   int      `group:"interval,omitempty"`
+	Lazy       bool     `group:"lazy,omitempty"`
+	DisableUDP bool     `group:"disable-udp,omitempty"`
 }
 
 func ParseProxyGroup(config map[string]interface{}, proxyMap map[string]C.Proxy, providersMap map[string]provider.ProxyProvider) (C.ProxyAdapter, error) {
 	decoder := structure.NewDecoder(structure.Option{TagName: "group", WeaklyTypedInput: true})
 
-	groupOption := &GroupCommonOption{}
+	groupOption := &GroupCommonOption{
+		Lazy: true,
+	}
 	if err := decoder.Decode(config, groupOption); err != nil {
 		return nil, errFormat
 	}
@@ -55,7 +58,7 @@ func ParseProxyGroup(config map[string]interface{}, proxyMap map[string]C.Proxy,
 
 		// if Use not empty, drop health check options
 		if len(groupOption.Use) != 0 {
-			hc := provider.NewHealthCheck(ps, "", 0)
+			hc := provider.NewHealthCheck(ps, "", 0, true)
 			pd, err := provider.NewCompatibleProvider(groupName, ps, hc)
 			if err != nil {
 				return nil, err
@@ -63,9 +66,13 @@ func ParseProxyGroup(config map[string]interface{}, proxyMap map[string]C.Proxy,
 
 			providers = append(providers, pd)
 		} else {
+			if _, ok := providersMap[groupName]; ok {
+				return nil, errDuplicateProvider
+			}
+
 			// select don't need health check
 			if groupOption.Type == "select" || groupOption.Type == "relay" {
-				hc := provider.NewHealthCheck(ps, "", 0)
+				hc := provider.NewHealthCheck(ps, "", 0, true)
 				pd, err := provider.NewCompatibleProvider(groupName, ps, hc)
 				if err != nil {
 					return nil, err
@@ -78,7 +85,7 @@ func ParseProxyGroup(config map[string]interface{}, proxyMap map[string]C.Proxy,
 					return nil, errMissHealthCheck
 				}
 
-				hc := provider.NewHealthCheck(ps, groupOption.URL, uint(groupOption.Interval))
+				hc := provider.NewHealthCheck(ps, groupOption.URL, uint(groupOption.Interval), groupOption.Lazy)
 				pd, err := provider.NewCompatibleProvider(groupName, ps, hc)
 				if err != nil {
 					return nil, err
@@ -102,15 +109,16 @@ func ParseProxyGroup(config map[string]interface{}, proxyMap map[string]C.Proxy,
 	switch groupOption.Type {
 	case "url-test":
 		opts := parseURLTestOption(config)
-		group = NewURLTest(groupName, providers, opts...)
+		group = NewURLTest(groupOption, providers, opts...)
 	case "select":
-		group = NewSelector(groupName, providers)
+		group = NewSelector(groupOption, providers)
 	case "fallback":
-		group = NewFallback(groupName, providers)
+		group = NewFallback(groupOption, providers)
 	case "load-balance":
-		group = NewLoadBalance(groupName, providers)
+		strategy := parseStrategy(config)
+		return NewLoadBalance(groupOption, providers, strategy)
 	case "relay":
-		group = NewRelay(groupName, providers)
+		group = NewRelay(groupOption, providers)
 	default:
 		return nil, fmt.Errorf("%w: %s", errType, groupOption.Type)
 	}

adapters/outboundgroup/relay.go

@@ -20,9 +20,9 @@ type Relay struct {
 }
 
 func (r *Relay) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	proxies := r.proxies(metadata)
+	proxies := r.proxies(metadata, true)
 	if len(proxies) == 0 {
-		return nil, errors.New("Proxy does not exist")
+		return nil, errors.New("proxy does not exist")
 	}
 	first := proxies[0]
 	last := proxies[len(proxies)-1]
@@ -58,7 +58,7 @@ func (r *Relay) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn,
 
 func (r *Relay) MarshalJSON() ([]byte, error) {
 	var all []string
-	for _, proxy := range r.rawProxies() {
+	for _, proxy := range r.rawProxies(false) {
 		all = append(all, proxy.Name())
 	}
 	return json.Marshal(map[string]interface{}{
@@ -67,16 +67,16 @@ func (r *Relay) MarshalJSON() ([]byte, error) {
 	})
 }
 
-func (r *Relay) rawProxies() []C.Proxy {
+func (r *Relay) rawProxies(touch bool) []C.Proxy {
 	elm, _, _ := r.single.Do(func() (interface{}, error) {
-		return getProvidersProxies(r.providers), nil
+		return getProvidersProxies(r.providers, touch), nil
 	})
 
 	return elm.([]C.Proxy)
 }
 
-func (r *Relay) proxies(metadata *C.Metadata) []C.Proxy {
-	proxies := r.rawProxies()
+func (r *Relay) proxies(metadata *C.Metadata, touch bool) []C.Proxy {
+	proxies := r.rawProxies(touch)
 
 	for n, proxy := range proxies {
 		subproxy := proxy.Unwrap(metadata)
@@ -89,9 +89,9 @@ func (r *Relay) proxies(metadata *C.Metadata) []C.Proxy {
 	return proxies
 }
 
-func NewRelay(name string, providers []provider.ProxyProvider) *Relay {
+func NewRelay(options *GroupCommonOption, providers []provider.ProxyProvider) *Relay {
 	return &Relay{
-		Base:      outbound.NewBase(name, "", C.Relay, false),
+		Base:      outbound.NewBase(options.Name, "", C.Relay, false),
 		single:    singledo.NewSingle(defaultGetProxiesDuration),
 		providers: providers,
 	}

adapters/outboundgroup/selector.go

@@ -13,13 +13,14 @@ import (
 
 type Selector struct {
 	*outbound.Base
-	single    *singledo.Single
-	selected  string
-	providers []provider.ProxyProvider
+	disableUDP bool
+	single     *singledo.Single
+	selected   string
+	providers  []provider.ProxyProvider
 }
 
 func (s *Selector) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := s.selectedProxy().DialContext(ctx, metadata)
+	c, err := s.selectedProxy(true).DialContext(ctx, metadata)
 	if err == nil {
 		c.AppendToChains(s)
 	}
@@ -27,7 +28,7 @@ func (s *Selector) DialContext(ctx context.Context, metadata *C.Metadata) (C.Con
 }
 
 func (s *Selector) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
-	pc, err := s.selectedProxy().DialUDP(metadata)
+	pc, err := s.selectedProxy(true).DialUDP(metadata)
 	if err == nil {
 		pc.AppendToChains(s)
 	}
@@ -35,12 +36,16 @@ func (s *Selector) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
 }
 
 func (s *Selector) SupportUDP() bool {
-	return s.selectedProxy().SupportUDP()
+	if s.disableUDP {
+		return false
+	}
+
+	return s.selectedProxy(false).SupportUDP()
 }
 
 func (s *Selector) MarshalJSON() ([]byte, error) {
 	var all []string
-	for _, proxy := range getProvidersProxies(s.providers) {
+	for _, proxy := range getProvidersProxies(s.providers, false) {
 		all = append(all, proxy.Name())
 	}
 
@@ -52,11 +57,11 @@ func (s *Selector) MarshalJSON() ([]byte, error) {
 }
 
 func (s *Selector) Now() string {
-	return s.selectedProxy().Name()
+	return s.selectedProxy(false).Name()
 }
 
 func (s *Selector) Set(name string) error {
-	for _, proxy := range getProvidersProxies(s.providers) {
+	for _, proxy := range getProvidersProxies(s.providers, false) {
 		if proxy.Name() == name {
 			s.selected = name
 			s.single.Reset()
@@ -64,16 +69,16 @@ func (s *Selector) Set(name string) error {
 		}
 	}
 
-	return errors.New("Proxy does not exist")
+	return errors.New("proxy not exist")
 }
 
 func (s *Selector) Unwrap(metadata *C.Metadata) C.Proxy {
-	return s.selectedProxy()
+	return s.selectedProxy(true)
 }
 
-func (s *Selector) selectedProxy() C.Proxy {
+func (s *Selector) selectedProxy(touch bool) C.Proxy {
 	elm, _, _ := s.single.Do(func() (interface{}, error) {
-		proxies := getProvidersProxies(s.providers)
+		proxies := getProvidersProxies(s.providers, touch)
 		for _, proxy := range proxies {
 			if proxy.Name() == s.selected {
 				return proxy, nil
@@ -86,12 +91,13 @@ func (s *Selector) selectedProxy() C.Proxy {
 	return elm.(C.Proxy)
 }
 
-func NewSelector(name string, providers []provider.ProxyProvider) *Selector {
+func NewSelector(options *GroupCommonOption, providers []provider.ProxyProvider) *Selector {
 	selected := providers[0].Proxies()[0].Name()
 	return &Selector{
-		Base:      outbound.NewBase(name, "", C.Selector, false),
-		single:    singledo.NewSingle(defaultGetProxiesDuration),
-		providers: providers,
-		selected:  selected,
+		Base:       outbound.NewBase(options.Name, "", C.Selector, false),
+		single:     singledo.NewSingle(defaultGetProxiesDuration),
+		providers:  providers,
+		selected:   selected,
+		disableUDP: options.DisableUDP,
 	}
 }

adapters/outboundgroup/urltest.go

@@ -22,7 +22,7 @@ func urlTestWithTolerance(tolerance uint16) urlTestOption {
 type URLTest struct {
 	*outbound.Base
 	tolerance  uint16
-	lastDelay  uint16
+	disableUDP bool
 	fastNode   C.Proxy
 	single     *singledo.Single
 	fastSingle *singledo.Single
@@ -30,11 +30,11 @@ type URLTest struct {
 }
 
 func (u *URLTest) Now() string {
-	return u.fast().Name()
+	return u.fast(false).Name()
 }
 
 func (u *URLTest) DialContext(ctx context.Context, metadata *C.Metadata) (c C.Conn, err error) {
-	c, err = u.fast().DialContext(ctx, metadata)
+	c, err = u.fast(true).DialContext(ctx, metadata)
 	if err == nil {
 		c.AppendToChains(u)
 	}
@@ -42,7 +42,7 @@ func (u *URLTest) DialContext(ctx context.Context, metadata *C.Metadata) (c C.Co
 }
 
 func (u *URLTest) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
-	pc, err := u.fast().DialUDP(metadata)
+	pc, err := u.fast(true).DialUDP(metadata)
 	if err == nil {
 		pc.AppendToChains(u)
 	}
@@ -50,27 +50,20 @@ func (u *URLTest) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
 }
 
 func (u *URLTest) Unwrap(metadata *C.Metadata) C.Proxy {
-	return u.fast()
+	return u.fast(true)
 }
 
-func (u *URLTest) proxies() []C.Proxy {
+func (u *URLTest) proxies(touch bool) []C.Proxy {
 	elm, _, _ := u.single.Do(func() (interface{}, error) {
-		return getProvidersProxies(u.providers), nil
+		return getProvidersProxies(u.providers, touch), nil
 	})
 
 	return elm.([]C.Proxy)
 }
 
-func (u *URLTest) fast() C.Proxy {
+func (u *URLTest) fast(touch bool) C.Proxy {
 	elm, _, _ := u.fastSingle.Do(func() (interface{}, error) {
-		// tolerance
-		if u.tolerance != 0 && u.fastNode != nil {
-			if u.fastNode.LastDelay() < u.lastDelay+u.tolerance {
-				return u.fastNode, nil
-			}
-		}
-
-		proxies := u.proxies()
+		proxies := u.proxies(touch)
 		fast := proxies[0]
 		min := fast.LastDelay()
 		for _, proxy := range proxies[1:] {
@@ -85,21 +78,28 @@ func (u *URLTest) fast() C.Proxy {
 			}
 		}
 
-		u.fastNode = fast
-		u.lastDelay = fast.LastDelay()
-		return fast, nil
+		// tolerance
+		if u.fastNode == nil || u.fastNode.LastDelay() > fast.LastDelay()+u.tolerance {
+			u.fastNode = fast
+		}
+
+		return u.fastNode, nil
 	})
 
 	return elm.(C.Proxy)
 }
 
 func (u *URLTest) SupportUDP() bool {
-	return u.fast().SupportUDP()
+	if u.disableUDP {
+		return false
+	}
+
+	return u.fast(false).SupportUDP()
 }
 
 func (u *URLTest) MarshalJSON() ([]byte, error) {
 	var all []string
-	for _, proxy := range u.proxies() {
+	for _, proxy := range u.proxies(false) {
 		all = append(all, proxy.Name())
 	}
 	return json.Marshal(map[string]interface{}{
@@ -122,12 +122,13 @@ func parseURLTestOption(config map[string]interface{}) []urlTestOption {
 	return opts
 }
 
-func NewURLTest(name string, providers []provider.ProxyProvider, options ...urlTestOption) *URLTest {
+func NewURLTest(commonOptions *GroupCommonOption, providers []provider.ProxyProvider, options ...urlTestOption) *URLTest {
 	urlTest := &URLTest{
-		Base:       outbound.NewBase(name, "", C.URLTest, false),
+		Base:       outbound.NewBase(commonOptions.Name, "", C.URLTest, false),
 		single:     singledo.NewSingle(defaultGetProxiesDuration),
 		fastSingle: singledo.NewSingle(time.Second * 10),
 		providers:  providers,
+		disableUDP: commonOptions.DisableUDP,
 	}
 
 	for _, option := range options {

adapters/provider/fetcher.go

@@ -23,6 +23,7 @@ type fetcher struct {
 	vehicle   Vehicle
 	updatedAt *time.Time
 	ticker    *time.Ticker
+	done      chan struct{}
 	hash      [16]byte
 	parser    parser
 	onUpdate  func(interface{})
@@ -73,8 +74,10 @@ func (f *fetcher) Initial() (interface{}, error) {
 		}
 	}
 
-	if err := safeWrite(f.vehicle.Path(), buf); err != nil {
-		return nil, err
+	if f.vehicle.Type() != File && !isLocal {
+		if err := safeWrite(f.vehicle.Path(), buf); err != nil {
+			return nil, err
+		}
 	}
 
 	f.hash = md5.Sum(buf)
@@ -105,8 +108,10 @@ func (f *fetcher) Update() (interface{}, bool, error) {
 		return nil, false, err
 	}
 
-	if err := safeWrite(f.vehicle.Path(), buf); err != nil {
-		return nil, false, err
+	if f.vehicle.Type() != File {
+		if err := safeWrite(f.vehicle.Path(), buf); err != nil {
+			return nil, false, err
+		}
 	}
 
 	f.updatedAt = &now
@@ -117,27 +122,33 @@ func (f *fetcher) Update() (interface{}, bool, error) {
 
 func (f *fetcher) Destroy() error {
 	if f.ticker != nil {
-		f.ticker.Stop()
+		f.done <- struct{}{}
 	}
 	return nil
 }
 
 func (f *fetcher) pullLoop() {
-	for range f.ticker.C {
-		elm, same, err := f.Update()
-		if err != nil {
-			log.Warnln("[Provider] %s pull error: %s", f.Name(), err.Error())
-			continue
-		}
+	for {
+		select {
+		case <-f.ticker.C:
+			elm, same, err := f.Update()
+			if err != nil {
+				log.Warnln("[Provider] %s pull error: %s", f.Name(), err.Error())
+				continue
+			}
 
-		if same {
-			log.Debugln("[Provider] %s's proxies doesn't change", f.Name())
-			continue
-		}
+			if same {
+				log.Debugln("[Provider] %s's proxies doesn't change", f.Name())
+				continue
+			}
 
-		log.Infoln("[Provider] %s's proxies update", f.Name())
-		if f.onUpdate != nil {
-			f.onUpdate(elm)
+			log.Infoln("[Provider] %s's proxies update", f.Name())
+			if f.onUpdate != nil {
+				f.onUpdate(elm)
+			}
+		case <-f.done:
+			f.ticker.Stop()
+			return
 		}
 	}
 }
@@ -165,6 +176,7 @@ func newFetcher(name string, interval time.Duration, vehicle Vehicle, parser par
 		ticker:   ticker,
 		vehicle:  vehicle,
 		parser:   parser,
+		done:     make(chan struct{}, 1),
 		onUpdate: onUpdate,
 	}
 }

adapters/provider/healthcheck.go

@@ -2,9 +2,12 @@ package provider
 
 import (
 	"context"
+	"sync"
 	"time"
 
 	C "github.com/Dreamacro/clash/constant"
+
+	"go.uber.org/atomic"
 )
 
 const (
@@ -17,10 +20,12 @@ type HealthCheckOption struct {
 }
 
 type HealthCheck struct {
-	url      string
-	proxies  []C.Proxy
-	interval uint
-	done     chan struct{}
+	url       string
+	proxies   []C.Proxy
+	interval  uint
+	lazy      bool
+	lastTouch *atomic.Int64
+	done      chan struct{}
 }
 
 func (hc *HealthCheck) process() {
@@ -30,7 +35,10 @@ func (hc *HealthCheck) process() {
 	for {
 		select {
 		case <-ticker.C:
-			hc.check()
+			now := time.Now().Unix()
+			if !hc.lazy || now-hc.lastTouch.Load() < int64(hc.interval) {
+				hc.check()
+			}
 		case <-hc.done:
 			ticker.Stop()
 			return
@@ -46,13 +54,24 @@ func (hc *HealthCheck) auto() bool {
 	return hc.interval != 0
 }
 
+func (hc *HealthCheck) touch() {
+	hc.lastTouch.Store(time.Now().Unix())
+}
+
 func (hc *HealthCheck) check() {
 	ctx, cancel := context.WithTimeout(context.Background(), defaultURLTestTimeout)
+	wg := &sync.WaitGroup{}
+
 	for _, proxy := range hc.proxies {
-		go proxy.URLTest(ctx, hc.url)
+		wg.Add(1)
+
+		go func(p C.Proxy) {
+			p.URLTest(ctx, hc.url)
+			wg.Done()
+		}(proxy)
 	}
 
-	<-ctx.Done()
+	wg.Wait()
 	cancel()
 }
 
@@ -60,11 +79,13 @@ func (hc *HealthCheck) close() {
 	hc.done <- struct{}{}
 }
 
-func NewHealthCheck(proxies []C.Proxy, url string, interval uint) *HealthCheck {
+func NewHealthCheck(proxies []C.Proxy, url string, interval uint, lazy bool) *HealthCheck {
 	return &HealthCheck{
-		proxies:  proxies,
-		url:      url,
-		interval: interval,
-		done:     make(chan struct{}, 1),
+		proxies:   proxies,
+		url:       url,
+		interval:  interval,
+		lazy:      lazy,
+		lastTouch: atomic.NewInt64(0),
+		done:      make(chan struct{}, 1),
 	}
 }

adapters/provider/parser.go

@@ -17,6 +17,7 @@ type healthCheckSchema struct {
 	Enable   bool   `provider:"enable"`
 	URL      string `provider:"url"`
 	Interval int    `provider:"interval"`
+	Lazy     bool   `provider:"lazy,omitempty"`
 }
 
 type proxyProviderSchema struct {
@@ -30,7 +31,11 @@ type proxyProviderSchema struct {
 func ParseProxyProvider(name string, mapping map[string]interface{}) (ProxyProvider, error) {
 	decoder := structure.NewDecoder(structure.Option{TagName: "provider", WeaklyTypedInput: true})
 
-	schema := &proxyProviderSchema{}
+	schema := &proxyProviderSchema{
+		HealthCheck: healthCheckSchema{
+			Lazy: true,
+		},
+	}
 	if err := decoder.Decode(mapping, schema); err != nil {
 		return nil, err
 	}
@@ -39,7 +44,7 @@ func ParseProxyProvider(name string, mapping map[string]interface{}) (ProxyProvi
 	if schema.HealthCheck.Enable {
 		hcInterval = uint(schema.HealthCheck.Interval)
 	}
-	hc := NewHealthCheck([]C.Proxy{}, schema.HealthCheck.URL, hcInterval)
+	hc := NewHealthCheck([]C.Proxy{}, schema.HealthCheck.URL, hcInterval, schema.HealthCheck.Lazy)
 
 	path := C.Path.Resolve(schema.Path)
 

adapters/provider/provider.go

@@ -50,6 +50,9 @@ type Provider interface {
 type ProxyProvider interface {
 	Provider
 	Proxies() []C.Proxy
+	// ProxiesWithTouch is used to inform the provider that the proxy is actually being used while getting the list of proxies.
+	// Commonly used in Dial and DialUDP
+	ProxiesWithTouch() []C.Proxy
 	HealthCheck()
 }
 
@@ -112,6 +115,11 @@ func (pp *proxySetProvider) Proxies() []C.Proxy {
 	return pp.proxies
 }
 
+func (pp *proxySetProvider) ProxiesWithTouch() []C.Proxy {
+	pp.healthCheck.touch()
+	return pp.Proxies()
+}
+
 func proxiesParse(buf []byte) (interface{}, error) {
 	schema := &ProxySchema{}
 
@@ -120,20 +128,20 @@ func proxiesParse(buf []byte) (interface{}, error) {
 	}
 
 	if schema.Proxies == nil {
-		return nil, errors.New("File must have a `proxies` field")
+		return nil, errors.New("file must have a `proxies` field")
 	}
 
 	proxies := []C.Proxy{}
 	for idx, mapping := range schema.Proxies {
 		proxy, err := outbound.ParseProxy(mapping)
 		if err != nil {
-			return nil, fmt.Errorf("Proxy %d error: %w", idx, err)
+			return nil, fmt.Errorf("proxy %d error: %w", idx, err)
 		}
 		proxies = append(proxies, proxy)
 	}
 
 	if len(proxies) == 0 {
-		return nil, errors.New("File doesn't have any valid proxy")
+		return nil, errors.New("file doesn't have any valid proxy")
 	}
 
 	return proxies, nil
@@ -223,6 +231,11 @@ func (cp *compatibleProvider) Proxies() []C.Proxy {
 	return cp.proxies
 }
 
+func (cp *compatibleProvider) ProxiesWithTouch() []C.Proxy {
+	cp.healthCheck.touch()
+	return cp.Proxies()
+}
+
 func stopCompatibleProvider(pd *CompatibleProvider) {
 	pd.healthCheck.close()
 }

adapters/provider/vehicle.go

@@ -107,6 +107,7 @@ func (h *HTTPVehicle) Read() ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
+	defer resp.Body.Close()
 
 	buf, err := ioutil.ReadAll(resp.Body)
 	if err != nil {

common/cache/lrucache.go

@@ -121,7 +121,7 @@ func (c *LruCache) Set(key interface{}, value interface{}) {
 	c.SetWithExpire(key, value, time.Unix(expires, 0))
 }
 
-// SetWithExpire stores the interface{} representation of a response for a given key and given exires.
+// SetWithExpire stores the interface{} representation of a response for a given key and given expires.
 // The expires time will round to second.
 func (c *LruCache) SetWithExpire(key interface{}, value interface{}, expires time.Time) {
 	c.mu.Lock()
@@ -146,6 +146,23 @@ func (c *LruCache) SetWithExpire(key interface{}, value interface{}, expires tim
 	c.maybeDeleteOldest()
 }
 
+// CloneTo clone and overwrite elements to another LruCache
+func (c *LruCache) CloneTo(n *LruCache) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	n.mu.Lock()
+	defer n.mu.Unlock()
+
+	n.lru = list.New()
+	n.cache = make(map[interface{}]*list.Element)
+
+	for e := c.lru.Front(); e != nil; e = e.Next() {
+		elm := e.Value.(*entry)
+		n.cache[elm.key] = n.lru.PushBack(elm)
+	}
+}
+
 func (c *LruCache) get(key interface{}) *entry {
 	c.mu.Lock()
 	defer c.mu.Unlock()
@@ -171,7 +188,7 @@ func (c *LruCache) get(key interface{}) *entry {
 }
 
 // Delete removes the value associated with a key.
-func (c *LruCache) Delete(key string) {
+func (c *LruCache) Delete(key interface{}) {
 	c.mu.Lock()
 
 	if le, ok := c.cache[key]; ok {

common/cache/lrucache_test.go

@@ -164,3 +164,21 @@ func TestStale(t *testing.T) {
 	assert.Equal(t, tenSecBefore, expires)
 	assert.Equal(t, true, exist)
 }
+
+func TestCloneTo(t *testing.T) {
+	o := NewLRUCache(WithSize(10))
+	o.Set("1", 1)
+	o.Set("2", 2)
+
+	n := NewLRUCache(WithSize(2))
+	n.Set("3", 3)
+	n.Set("4", 4)
+
+	o.CloneTo(n)
+
+	assert.False(t, n.Exist("3"))
+	assert.True(t, n.Exist("1"))
+
+	n.Set("5", 5)
+	assert.False(t, n.Exist("1"))
+}

common/net/io.go

@@ -0,0 +1,11 @@
+package net
+
+import "io"
+
+type ReadOnlyReader struct {
+	io.Reader
+}
+
+type WriteOnlyWriter struct {
+	io.Writer
+}

common/observable/observable_test.go

@@ -1,12 +1,12 @@
 package observable
 
 import (
-	"runtime"
 	"sync"
 	"testing"
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"go.uber.org/atomic"
 )
 
 func iterator(item []interface{}) chan interface{} {
@@ -33,25 +33,25 @@ func TestObservable(t *testing.T) {
 	assert.Equal(t, count, 5)
 }
 
-func TestObservable_MutilSubscribe(t *testing.T) {
+func TestObservable_MultiSubscribe(t *testing.T) {
 	iter := iterator([]interface{}{1, 2, 3, 4, 5})
 	src := NewObservable(iter)
 	ch1, _ := src.Subscribe()
 	ch2, _ := src.Subscribe()
-	count := 0
+	var count = atomic.NewInt32(0)
 
 	var wg sync.WaitGroup
 	wg.Add(2)
 	waitCh := func(ch <-chan interface{}) {
 		for range ch {
-			count++
+			count.Inc()
 		}
 		wg.Done()
 	}
 	go waitCh(ch1)
 	go waitCh(ch2)
 	wg.Wait()
-	assert.Equal(t, count, 10)
+	assert.Equal(t, int32(10), count.Load())
 }
 
 func TestObservable_UnSubscribe(t *testing.T) {
@@ -82,9 +82,6 @@ func TestObservable_UnSubscribeWithNotExistSubscription(t *testing.T) {
 }
 
 func TestObservable_SubscribeGoroutineLeak(t *testing.T) {
-	// waiting for other goroutine recycle
-	time.Sleep(120 * time.Millisecond)
-	init := runtime.NumGoroutine()
 	iter := iterator([]interface{}{1, 2, 3, 4, 5})
 	src := NewObservable(iter)
 	max := 100
@@ -107,6 +104,43 @@ func TestObservable_SubscribeGoroutineLeak(t *testing.T) {
 		go waitCh(ch)
 	}
 	wg.Wait()
-	now := runtime.NumGoroutine()
-	assert.Equal(t, init, now)
+
+	for _, sub := range list {
+		_, more := <-sub
+		assert.False(t, more)
+	}
+
+	_, more := <-list[0]
+	assert.False(t, more)
+}
+
+func Benchmark_Observable_1000(b *testing.B) {
+	ch := make(chan interface{})
+	o := NewObservable(ch)
+	num := 1000
+
+	subs := []Subscription{}
+	for i := 0; i < num; i++ {
+		sub, _ := o.Subscribe()
+		subs = append(subs, sub)
+	}
+
+	wg := sync.WaitGroup{}
+	wg.Add(num)
+
+	b.ResetTimer()
+	for _, sub := range subs {
+		go func(s Subscription) {
+			for range s {
+			}
+			wg.Done()
+		}(sub)
+	}
+
+	for i := 0; i < b.N; i++ {
+		ch <- i
+	}
+
+	close(ch)
+	wg.Wait()
 }

common/observable/subscriber.go

@@ -2,34 +2,32 @@ package observable
 
 import (
 	"sync"
-
-	"gopkg.in/eapache/channels.v1"
 )
 
 type Subscription <-chan interface{}
 
 type Subscriber struct {
-	buffer *channels.InfiniteChannel
+	buffer chan interface{}
 	once   sync.Once
 }
 
 func (s *Subscriber) Emit(item interface{}) {
-	s.buffer.In() <- item
+	s.buffer <- item
 }
 
 func (s *Subscriber) Out() Subscription {
-	return s.buffer.Out()
+	return s.buffer
 }
 
 func (s *Subscriber) Close() {
 	s.once.Do(func() {
-		s.buffer.Close()
+		close(s.buffer)
 	})
 }
 
 func newSubscriber() *Subscriber {
 	sub := &Subscriber{
-		buffer: channels.NewInfiniteChannel(),
+		buffer: make(chan interface{}, 200),
 	}
 	return sub
 }

common/pool/alloc.go

@@ -55,11 +55,13 @@ func (alloc *Allocator) Put(buf []byte) error {
 	if cap(buf) == 0 || cap(buf) > 65536 || cap(buf) != 1<<bits {
 		return errors.New("allocator Put() incorrect buffer size")
 	}
+
+	//lint:ignore SA6002 ignore temporarily
 	alloc.buffers[bits].Put(buf)
 	return nil
 }
 
-// msb return the pos of most significiant bit
+// msb return the pos of most significant bit
 func msb(size int) uint16 {
 	return uint16(bits.Len32(uint32(size)) - 1)
 }

common/pool/alloc_test.go

@@ -25,11 +25,11 @@ func TestAllocGet(t *testing.T) {
 func TestAllocPut(t *testing.T) {
 	alloc := NewAllocator()
 	assert.NotNil(t, alloc.Put(nil), "put nil misbehavior")
-	assert.NotNil(t, alloc.Put(make([]byte, 3, 3)), "put elem:3 []bytes misbehavior")
-	assert.Nil(t, alloc.Put(make([]byte, 4, 4)), "put elem:4 []bytes misbehavior")
+	assert.NotNil(t, alloc.Put(make([]byte, 3)), "put elem:3 []bytes misbehavior")
+	assert.Nil(t, alloc.Put(make([]byte, 4)), "put elem:4 []bytes misbehavior")
 	assert.Nil(t, alloc.Put(make([]byte, 1023, 1024)), "put elem:1024 []bytes misbehavior")
-	assert.Nil(t, alloc.Put(make([]byte, 65536, 65536)), "put elem:65536 []bytes misbehavior")
-	assert.NotNil(t, alloc.Put(make([]byte, 65537, 65537)), "put elem:65537 []bytes misbehavior")
+	assert.Nil(t, alloc.Put(make([]byte, 65536)), "put elem:65536 []bytes misbehavior")
+	assert.NotNil(t, alloc.Put(make([]byte, 65537)), "put elem:65537 []bytes misbehavior")
 }
 
 func TestAllocPutThenGet(t *testing.T) {

common/singledo/singledo.go

@@ -24,6 +24,8 @@ type Result struct {
 	Err error
 }
 
+// Do single.Do likes sync.singleFlight
+//lint:ignore ST1008 it likes sync.singleFlight
 func (s *Single) Do(fn func() (interface{}, error)) (v interface{}, err error, shared bool) {
 	s.mux.Lock()
 	now := time.Now()
@@ -44,9 +46,12 @@ func (s *Single) Do(fn func() (interface{}, error)) (v interface{}, err error, s
 	s.mux.Unlock()
 	call.val, call.err = fn()
 	call.wg.Done()
+
+	s.mux.Lock()
 	s.call = nil
 	s.result = &Result{call.val, call.err}
 	s.last = now
+	s.mux.Unlock()
 	return call.val, call.err, false
 }
 

common/singledo/singledo_test.go

@@ -6,12 +6,13 @@ import (
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"go.uber.org/atomic"
 )
 
 func TestBasic(t *testing.T) {
 	single := NewSingle(time.Millisecond * 30)
 	foo := 0
-	shardCount := 0
+	var shardCount = atomic.NewInt32(0)
 	call := func() (interface{}, error) {
 		foo++
 		time.Sleep(time.Millisecond * 5)
@@ -25,7 +26,7 @@ func TestBasic(t *testing.T) {
 		go func() {
 			_, _, shard := single.Do(call)
 			if shard {
-				shardCount++
+				shardCount.Inc()
 			}
 			wg.Done()
 		}()
@@ -33,7 +34,7 @@ func TestBasic(t *testing.T) {
 
 	wg.Wait()
 	assert.Equal(t, 1, foo)
-	assert.Equal(t, 4, shardCount)
+	assert.Equal(t, int32(4), shardCount.Load())
 }
 
 func TestTimer(t *testing.T) {

component/dialer/bind.go

@@ -0,0 +1,118 @@
+package dialer
+
+import (
+	"errors"
+	"net"
+	"time"
+
+	"github.com/Dreamacro/clash/common/singledo"
+)
+
+// In some OS, such as Windows, it takes a little longer to get interface information
+var ifaceSingle = singledo.NewSingle(time.Second * 20)
+
+var (
+	errPlatformNotSupport = errors.New("unsupport platform")
+)
+
+func lookupTCPAddr(ip net.IP, addrs []net.Addr) (*net.TCPAddr, error) {
+	ipv4 := ip.To4() != nil
+
+	for _, elm := range addrs {
+		addr, ok := elm.(*net.IPNet)
+		if !ok {
+			continue
+		}
+
+		addrV4 := addr.IP.To4() != nil
+
+		if addrV4 && ipv4 {
+			return &net.TCPAddr{IP: addr.IP, Port: 0}, nil
+		} else if !addrV4 && !ipv4 {
+			return &net.TCPAddr{IP: addr.IP, Port: 0}, nil
+		}
+	}
+
+	return nil, ErrAddrNotFound
+}
+
+func lookupUDPAddr(ip net.IP, addrs []net.Addr) (*net.UDPAddr, error) {
+	ipv4 := ip.To4() != nil
+
+	for _, elm := range addrs {
+		addr, ok := elm.(*net.IPNet)
+		if !ok {
+			continue
+		}
+
+		addrV4 := addr.IP.To4() != nil
+
+		if addrV4 && ipv4 {
+			return &net.UDPAddr{IP: addr.IP, Port: 0}, nil
+		} else if !addrV4 && !ipv4 {
+			return &net.UDPAddr{IP: addr.IP, Port: 0}, nil
+		}
+	}
+
+	return nil, ErrAddrNotFound
+}
+
+func fallbackBindToDialer(dialer *net.Dialer, network string, ip net.IP, name string) error {
+	if !ip.IsGlobalUnicast() {
+		return nil
+	}
+
+	iface, err, _ := ifaceSingle.Do(func() (interface{}, error) {
+		return net.InterfaceByName(name)
+	})
+	if err != nil {
+		return err
+	}
+
+	addrs, err := iface.(*net.Interface).Addrs()
+	if err != nil {
+		return err
+	}
+
+	switch network {
+	case "tcp", "tcp4", "tcp6":
+		if addr, err := lookupTCPAddr(ip, addrs); err == nil {
+			dialer.LocalAddr = addr
+		} else {
+			return err
+		}
+	case "udp", "udp4", "udp6":
+		if addr, err := lookupUDPAddr(ip, addrs); err == nil {
+			dialer.LocalAddr = addr
+		} else {
+			return err
+		}
+	}
+
+	return nil
+}
+
+func fallbackBindToListenConfig(name string) (string, error) {
+	iface, err, _ := ifaceSingle.Do(func() (interface{}, error) {
+		return net.InterfaceByName(name)
+	})
+	if err != nil {
+		return "", err
+	}
+
+	addrs, err := iface.(*net.Interface).Addrs()
+	if err != nil {
+		return "", err
+	}
+
+	for _, elm := range addrs {
+		addr, ok := elm.(*net.IPNet)
+		if !ok || addr.IP.To4() == nil {
+			continue
+		}
+
+		return net.JoinHostPort(addr.IP.String(), "0"), nil
+	}
+
+	return "", ErrAddrNotFound
+}

component/dialer/bind_darwin.go

@@ -0,0 +1,53 @@
+package dialer
+
+import (
+	"net"
+	"syscall"
+)
+
+type controlFn = func(network, address string, c syscall.RawConn) error
+
+func bindControl(ifaceIdx int) controlFn {
+	return func(network, address string, c syscall.RawConn) error {
+		ipStr, _, err := net.SplitHostPort(address)
+		if err == nil {
+			ip := net.ParseIP(ipStr)
+			if ip != nil && !ip.IsGlobalUnicast() {
+				return nil
+			}
+		}
+
+		return c.Control(func(fd uintptr) {
+			switch network {
+			case "tcp4", "udp4":
+				syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IP, syscall.IP_BOUND_IF, ifaceIdx)
+			case "tcp6", "udp6":
+				syscall.SetsockoptInt(int(fd), syscall.IPPROTO_IPV6, syscall.IPV6_BOUND_IF, ifaceIdx)
+			}
+		})
+	}
+}
+
+func bindIfaceToDialer(dialer *net.Dialer, ifaceName string) error {
+	iface, err, _ := ifaceSingle.Do(func() (interface{}, error) {
+		return net.InterfaceByName(ifaceName)
+	})
+	if err != nil {
+		return err
+	}
+
+	dialer.Control = bindControl(iface.(*net.Interface).Index)
+	return nil
+}
+
+func bindIfaceToListenConfig(lc *net.ListenConfig, ifaceName string) error {
+	iface, err, _ := ifaceSingle.Do(func() (interface{}, error) {
+		return net.InterfaceByName(ifaceName)
+	})
+	if err != nil {
+		return err
+	}
+
+	lc.Control = bindControl(iface.(*net.Interface).Index)
+	return nil
+}

component/dialer/bind_linux.go

@@ -0,0 +1,36 @@
+package dialer
+
+import (
+	"net"
+	"syscall"
+)
+
+type controlFn = func(network, address string, c syscall.RawConn) error
+
+func bindControl(ifaceName string) controlFn {
+	return func(network, address string, c syscall.RawConn) error {
+		ipStr, _, err := net.SplitHostPort(address)
+		if err == nil {
+			ip := net.ParseIP(ipStr)
+			if ip != nil && !ip.IsGlobalUnicast() {
+				return nil
+			}
+		}
+
+		return c.Control(func(fd uintptr) {
+			syscall.BindToDevice(int(fd), ifaceName)
+		})
+	}
+}
+
+func bindIfaceToDialer(dialer *net.Dialer, ifaceName string) error {
+	dialer.Control = bindControl(ifaceName)
+
+	return nil
+}
+
+func bindIfaceToListenConfig(lc *net.ListenConfig, ifaceName string) error {
+	lc.Control = bindControl(ifaceName)
+
+	return nil
+}

component/dialer/bind_others.go

@@ -0,0 +1,13 @@
+// +build !linux,!darwin
+
+package dialer
+
+import "net"
+
+func bindIfaceToDialer(dialer *net.Dialer, ifaceName string) error {
+	return errPlatformNotSupport
+}
+
+func bindIfaceToListenConfig(lc *net.ListenConfig, ifaceName string) error {
+	return errPlatformNotSupport
+}

component/dialer/dialer.go

@@ -19,17 +19,6 @@ func Dialer() (*net.Dialer, error) {
 	return dialer, nil
 }
 
-func ListenConfig() (*net.ListenConfig, error) {
-	cfg := &net.ListenConfig{}
-	if ListenConfigHook != nil {
-		if err := ListenConfigHook(cfg); err != nil {
-			return nil, err
-		}
-	}
-
-	return cfg, nil
-}
-
 func Dial(network, address string) (net.Conn, error) {
 	return DialContext(context.Background(), network, address)
 }
@@ -66,29 +55,26 @@ func DialContext(ctx context.Context, network, address string) (net.Conn, error)
 		}
 		return dialer.DialContext(ctx, network, net.JoinHostPort(ip.String(), port))
 	case "tcp", "udp":
-		return dualStackDailContext(ctx, network, address)
+		return dualStackDialContext(ctx, network, address)
 	default:
 		return nil, errors.New("network invalid")
 	}
 }
 
 func ListenPacket(network, address string) (net.PacketConn, error) {
-	lc, err := ListenConfig()
-	if err != nil {
-		return nil, err
-	}
-
-	if ListenPacketHook != nil && address == "" {
-		ip, err := ListenPacketHook()
+	cfg := &net.ListenConfig{}
+	if ListenPacketHook != nil {
+		var err error
+		address, err = ListenPacketHook(cfg, address)
 		if err != nil {
 			return nil, err
 		}
-		address = net.JoinHostPort(ip.String(), "0")
 	}
-	return lc.ListenPacket(context.Background(), network, address)
+
+	return cfg.ListenPacket(context.Background(), network, address)
 }
 
-func dualStackDailContext(ctx context.Context, network, address string) (net.Conn, error) {
+func dualStackDialContext(ctx context.Context, network, address string) (net.Conn, error) {
 	host, port, err := net.SplitHostPort(address)
 	if err != nil {
 		return nil, err
@@ -147,28 +133,27 @@ func dualStackDailContext(ctx context.Context, network, address string) (net.Con
 	go startRacer(ctx, network+"4", host, false)
 	go startRacer(ctx, network+"6", host, true)
 
-	for {
-		select {
-		case res := <-results:
-			if res.error == nil {
-				return res.Conn, nil
-			}
+	for res := range results {
+		if res.error == nil {
+			return res.Conn, nil
+		}
 
-			if !res.ipv6 {
-				primary = res
+		if !res.ipv6 {
+			primary = res
+		} else {
+			fallback = res
+		}
+
+		if primary.done && fallback.done {
+			if primary.resolved {
+				return nil, primary.error
+			} else if fallback.resolved {
+				return nil, fallback.error
 			} else {
-				fallback = res
-			}
-
-			if primary.done && fallback.done {
-				if primary.resolved {
-					return nil, primary.error
-				} else if fallback.resolved {
-					return nil, fallback.error
-				} else {
-					return nil, primary.error
-				}
+				return nil, primary.error
 			}
 		}
 	}
+
+	return nil, errors.New("never touched")
 }

component/dialer/hook.go

@@ -3,20 +3,15 @@ package dialer
 import (
 	"errors"
 	"net"
-	"time"
-
-	"github.com/Dreamacro/clash/common/singledo"
 )
 
 type DialerHookFunc = func(dialer *net.Dialer) error
 type DialHookFunc = func(dialer *net.Dialer, network string, ip net.IP) error
-type ListenConfigHookFunc = func(*net.ListenConfig) error
-type ListenPacketHookFunc = func() (net.IP, error)
+type ListenPacketHookFunc = func(lc *net.ListenConfig, address string) (string, error)
 
 var (
 	DialerHook       DialerHookFunc
 	DialHook         DialHookFunc
-	ListenConfigHook ListenConfigHookFunc
 	ListenPacketHook ListenPacketHookFunc
 )
 
@@ -25,124 +20,24 @@ var (
 	ErrNetworkNotSupport = errors.New("network not support")
 )
 
-func lookupTCPAddr(ip net.IP, addrs []net.Addr) (*net.TCPAddr, error) {
-	ipv4 := ip.To4() != nil
-
-	for _, elm := range addrs {
-		addr, ok := elm.(*net.IPNet)
-		if !ok {
-			continue
-		}
-
-		addrV4 := addr.IP.To4() != nil
-
-		if addrV4 && ipv4 {
-			return &net.TCPAddr{IP: addr.IP, Port: 0}, nil
-		} else if !addrV4 && !ipv4 {
-			return &net.TCPAddr{IP: addr.IP, Port: 0}, nil
-		}
-	}
-
-	return nil, ErrAddrNotFound
-}
-
-func lookupUDPAddr(ip net.IP, addrs []net.Addr) (*net.UDPAddr, error) {
-	ipv4 := ip.To4() != nil
-
-	for _, elm := range addrs {
-		addr, ok := elm.(*net.IPNet)
-		if !ok {
-			continue
-		}
-
-		addrV4 := addr.IP.To4() != nil
-
-		if addrV4 && ipv4 {
-			return &net.UDPAddr{IP: addr.IP, Port: 0}, nil
-		} else if !addrV4 && !ipv4 {
-			return &net.UDPAddr{IP: addr.IP, Port: 0}, nil
-		}
-	}
-
-	return nil, ErrAddrNotFound
-}
-
 func ListenPacketWithInterface(name string) ListenPacketHookFunc {
-	single := singledo.NewSingle(5 * time.Second)
-
-	return func() (net.IP, error) {
-		elm, err, _ := single.Do(func() (interface{}, error) {
-			iface, err := net.InterfaceByName(name)
-			if err != nil {
-				return nil, err
-			}
-
-			addrs, err := iface.Addrs()
-			if err != nil {
-				return nil, err
-			}
-
-			return addrs, nil
-		})
-
-		if err != nil {
-			return nil, err
+	return func(lc *net.ListenConfig, address string) (string, error) {
+		err := bindIfaceToListenConfig(lc, name)
+		if err == errPlatformNotSupport {
+			address, err = fallbackBindToListenConfig(name)
 		}
 
-		addrs := elm.([]net.Addr)
-
-		for _, elm := range addrs {
-			addr, ok := elm.(*net.IPNet)
-			if !ok || addr.IP.To4() == nil {
-				continue
-			}
-
-			return addr.IP, nil
-		}
-
-		return nil, ErrAddrNotFound
+		return address, err
 	}
 }
 
 func DialerWithInterface(name string) DialHookFunc {
-	single := singledo.NewSingle(5 * time.Second)
-
 	return func(dialer *net.Dialer, network string, ip net.IP) error {
-		elm, err, _ := single.Do(func() (interface{}, error) {
-			iface, err := net.InterfaceByName(name)
-			if err != nil {
-				return nil, err
-			}
-
-			addrs, err := iface.Addrs()
-			if err != nil {
-				return nil, err
-			}
-
-			return addrs, nil
-		})
-
-		if err != nil {
-			return err
+		err := bindIfaceToDialer(dialer, name)
+		if err == errPlatformNotSupport {
+			err = fallbackBindToDialer(dialer, network, ip, name)
 		}
 
-		addrs := elm.([]net.Addr)
-
-		switch network {
-		case "tcp", "tcp4", "tcp6":
-			if addr, err := lookupTCPAddr(ip, addrs); err == nil {
-				dialer.LocalAddr = addr
-			} else {
-				return err
-			}
-		case "udp", "udp4", "udp6":
-			if addr, err := lookupUDPAddr(ip, addrs); err == nil {
-				dialer.LocalAddr = addr
-			} else {
-				return err
-			}
-		}
-
-		return nil
+		return err
 	}
 }

component/fakeip/pool.go

@@ -17,6 +17,7 @@ type Pool struct {
 	offset  uint32
 	mux     sync.Mutex
 	host    *trie.DomainTrie
+	ipnet   *net.IPNet
 	cache   *cache.LruCache
 }
 
@@ -89,6 +90,16 @@ func (p *Pool) Gateway() net.IP {
 	return uintToIP(p.gateway)
 }
 
+// IPNet return raw ipnet
+func (p *Pool) IPNet() *net.IPNet {
+	return p.ipnet
+}
+
+// PatchFrom clone cache from old pool
+func (p *Pool) PatchFrom(o *Pool) {
+	o.cache.CloneTo(p.cache)
+}
+
 func (p *Pool) get(host string) net.IP {
 	current := p.offset
 	for {
@@ -116,7 +127,7 @@ func ipToUint(ip net.IP) uint32 {
 }
 
 func uintToIP(v uint32) net.IP {
-	return net.IPv4(byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
+	return net.IP{byte(v >> 24), byte(v >> 16), byte(v >> 8), byte(v)}
 }
 
 // New return Pool instance
@@ -136,6 +147,7 @@ func New(ipnet *net.IPNet, size int, host *trie.DomainTrie) (*Pool, error) {
 		max:     max,
 		gateway: min - 1,
 		host:    host,
+		ipnet:   ipnet,
 		cache:   cache.NewLRUCache(cache.WithSize(size * 2)),
 	}, nil
 }

component/nat/table.go

@@ -22,9 +22,9 @@ func (t *Table) Get(key string) C.PacketConn {
 	return item.(C.PacketConn)
 }
 
-func (t *Table) GetOrCreateLock(key string) (*sync.WaitGroup, bool) {
-	item, loaded := t.mapping.LoadOrStore(key, &sync.WaitGroup{})
-	return item.(*sync.WaitGroup), loaded
+func (t *Table) GetOrCreateLock(key string) (*sync.Cond, bool) {
+	item, loaded := t.mapping.LoadOrStore(key, sync.NewCond(&sync.Mutex{}))
+	return item.(*sync.Cond), loaded
 }
 
 func (t *Table) Delete(key string) {

component/pool/pool.go

@@ -0,0 +1,114 @@
+package pool
+
+import (
+	"context"
+	"runtime"
+	"time"
+)
+
+type Factory = func(context.Context) (interface{}, error)
+
+type entry struct {
+	elm  interface{}
+	time time.Time
+}
+
+type Option func(*pool)
+
+// WithEvict set the evict callback
+func WithEvict(cb func(interface{})) Option {
+	return func(p *pool) {
+		p.evict = cb
+	}
+}
+
+// WithAge defined element max age (millisecond)
+func WithAge(maxAge int64) Option {
+	return func(p *pool) {
+		p.maxAge = maxAge
+	}
+}
+
+// WithSize defined max size of Pool
+func WithSize(maxSize int) Option {
+	return func(p *pool) {
+		p.ch = make(chan interface{}, maxSize)
+	}
+}
+
+// Pool is for GC, see New for detail
+type Pool struct {
+	*pool
+}
+
+type pool struct {
+	ch      chan interface{}
+	factory Factory
+	evict   func(interface{})
+	maxAge  int64
+}
+
+func (p *pool) GetContext(ctx context.Context) (interface{}, error) {
+	now := time.Now()
+	for {
+		select {
+		case item := <-p.ch:
+			elm := item.(*entry)
+			if p.maxAge != 0 && now.Sub(item.(*entry).time).Milliseconds() > p.maxAge {
+				if p.evict != nil {
+					p.evict(elm.elm)
+				}
+				continue
+			}
+
+			return elm.elm, nil
+		default:
+			return p.factory(ctx)
+		}
+	}
+}
+
+func (p *pool) Get() (interface{}, error) {
+	return p.GetContext(context.Background())
+}
+
+func (p *pool) Put(item interface{}) {
+	e := &entry{
+		elm:  item,
+		time: time.Now(),
+	}
+
+	select {
+	case p.ch <- e:
+		return
+	default:
+		// pool is full
+		if p.evict != nil {
+			p.evict(item)
+		}
+		return
+	}
+}
+
+func recycle(p *Pool) {
+	for item := range p.pool.ch {
+		if p.pool.evict != nil {
+			p.pool.evict(item.(*entry).elm)
+		}
+	}
+}
+
+func New(factory Factory, options ...Option) *Pool {
+	p := &pool{
+		ch:      make(chan interface{}, 10),
+		factory: factory,
+	}
+
+	for _, option := range options {
+		option(p)
+	}
+
+	P := &Pool{p}
+	runtime.SetFinalizer(P, recycle)
+	return P
+}

component/pool/pool_test.go

@@ -0,0 +1,73 @@
+package pool
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func lg() Factory {
+	initial := -1
+	return func(context.Context) (interface{}, error) {
+		initial++
+		return initial, nil
+	}
+}
+
+func TestPool_Basic(t *testing.T) {
+	g := lg()
+	pool := New(g)
+
+	elm, _ := pool.Get()
+	assert.Equal(t, 0, elm.(int))
+	pool.Put(elm)
+	elm, _ = pool.Get()
+	assert.Equal(t, 0, elm.(int))
+	elm, _ = pool.Get()
+	assert.Equal(t, 1, elm.(int))
+}
+
+func TestPool_MaxSize(t *testing.T) {
+	g := lg()
+	size := 5
+	pool := New(g, WithSize(size))
+
+	items := []interface{}{}
+
+	for i := 0; i < size; i++ {
+		item, _ := pool.Get()
+		items = append(items, item)
+	}
+
+	extra, _ := pool.Get()
+	assert.Equal(t, size, extra.(int))
+
+	for _, item := range items {
+		pool.Put(item)
+	}
+
+	pool.Put(extra)
+
+	for _, item := range items {
+		elm, _ := pool.Get()
+		assert.Equal(t, item.(int), elm.(int))
+	}
+}
+
+func TestPool_MaxAge(t *testing.T) {
+	g := lg()
+	pool := New(g, WithAge(20))
+
+	elm, _ := pool.Get()
+	pool.Put(elm)
+
+	elm, _ = pool.Get()
+	assert.Equal(t, 0, elm.(int))
+	pool.Put(elm)
+
+	time.Sleep(time.Millisecond * 22)
+	elm, _ = pool.Get()
+	assert.Equal(t, 1, elm.(int))
+}

component/process/process.go

@@ -0,0 +1,21 @@
+package process
+
+import (
+	"errors"
+	"net"
+)
+
+var (
+	ErrInvalidNetwork     = errors.New("invalid network")
+	ErrPlatformNotSupport = errors.New("not support on this platform")
+	ErrNotFound           = errors.New("process not found")
+)
+
+const (
+	TCP = "tcp"
+	UDP = "udp"
+)
+
+func FindProcessName(network string, srcIP net.IP, srcPort int) (string, error) {
+	return findProcessName(network, srcIP, srcPort)
+}

component/process/process_darwin.go

@@ -0,0 +1,107 @@
+package process
+
+import (
+	"bytes"
+	"encoding/binary"
+	"net"
+	"path/filepath"
+	"syscall"
+	"unsafe"
+)
+
+const (
+	procpidpathinfo     = 0xb
+	procpidpathinfosize = 1024
+	proccallnumpidinfo  = 0x2
+)
+
+func findProcessName(network string, ip net.IP, port int) (string, error) {
+	var spath string
+	switch network {
+	case TCP:
+		spath = "net.inet.tcp.pcblist_n"
+	case UDP:
+		spath = "net.inet.udp.pcblist_n"
+	default:
+		return "", ErrInvalidNetwork
+	}
+
+	isIPv4 := ip.To4() != nil
+
+	value, err := syscall.Sysctl(spath)
+	if err != nil {
+		return "", err
+	}
+
+	buf := []byte(value)
+
+	// from darwin-xnu/bsd/netinet/in_pcblist.c:get_pcblist_n
+	// size/offset are round up (aligned) to 8 bytes in darwin
+	// rup8(sizeof(xinpcb_n)) + rup8(sizeof(xsocket_n)) +
+	// 2 * rup8(sizeof(xsockbuf_n)) + rup8(sizeof(xsockstat_n))
+	itemSize := 384
+	if network == TCP {
+		// rup8(sizeof(xtcpcb_n))
+		itemSize += 208
+	}
+	// skip the first xinpgen(24 bytes) block
+	for i := 24; i+itemSize <= len(buf); i += itemSize {
+		// offset of xinpcb_n and xsocket_n
+		inp, so := i, i+104
+
+		srcPort := binary.BigEndian.Uint16(buf[inp+18 : inp+20])
+		if uint16(port) != srcPort {
+			continue
+		}
+
+		// xinpcb_n.inp_vflag
+		flag := buf[inp+44]
+
+		var srcIP net.IP
+		switch {
+		case flag&0x1 > 0 && isIPv4:
+			// ipv4
+			srcIP = net.IP(buf[inp+76 : inp+80])
+		case flag&0x2 > 0 && !isIPv4:
+			// ipv6
+			srcIP = net.IP(buf[inp+64 : inp+80])
+		default:
+			continue
+		}
+
+		if !ip.Equal(srcIP) {
+			continue
+		}
+
+		// xsocket_n.so_last_pid
+		pid := readNativeUint32(buf[so+68 : so+72])
+		return getExecPathFromPID(pid)
+	}
+
+	return "", ErrNotFound
+}
+
+func getExecPathFromPID(pid uint32) (string, error) {
+	buf := make([]byte, procpidpathinfosize)
+	_, _, errno := syscall.Syscall6(
+		syscall.SYS_PROC_INFO,
+		proccallnumpidinfo,
+		uintptr(pid),
+		procpidpathinfo,
+		0,
+		uintptr(unsafe.Pointer(&buf[0])),
+		procpidpathinfosize)
+	if errno != 0 {
+		return "", errno
+	}
+	firstZero := bytes.IndexByte(buf, 0)
+	if firstZero <= 0 {
+		return "", nil
+	}
+
+	return filepath.Base(string(buf[:firstZero])), nil
+}
+
+func readNativeUint32(b []byte) uint32 {
+	return *(*uint32)(unsafe.Pointer(&b[0]))
+}

component/process/process_freebsd_amd64.go

@@ -0,0 +1,228 @@
+package process
+
+import (
+	"encoding/binary"
+	"fmt"
+	"net"
+	"path/filepath"
+	"strconv"
+	"strings"
+	"sync"
+	"syscall"
+	"unsafe"
+
+	"github.com/Dreamacro/clash/log"
+)
+
+// store process name for when dealing with multiple PROCESS-NAME rules
+var (
+	defaultSearcher *searcher
+
+	once sync.Once
+)
+
+func findProcessName(network string, ip net.IP, srcPort int) (string, error) {
+	once.Do(func() {
+		if err := initSearcher(); err != nil {
+			log.Errorln("Initialize PROCESS-NAME failed: %s", err.Error())
+			log.Warnln("All PROCESS-NAME rules will be skipped")
+			return
+		}
+	})
+
+	var spath string
+	isTCP := network == TCP
+	switch network {
+	case TCP:
+		spath = "net.inet.tcp.pcblist"
+	case UDP:
+		spath = "net.inet.udp.pcblist"
+	default:
+		return "", ErrInvalidNetwork
+	}
+
+	value, err := syscall.Sysctl(spath)
+	if err != nil {
+		return "", err
+	}
+
+	buf := []byte(value)
+	pid, err := defaultSearcher.Search(buf, ip, uint16(srcPort), isTCP)
+	if err != nil {
+		return "", err
+	}
+
+	return getExecPathFromPID(pid)
+}
+
+func getExecPathFromPID(pid uint32) (string, error) {
+	buf := make([]byte, 2048)
+	size := uint64(len(buf))
+	// CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, pid
+	mib := [4]uint32{1, 14, 12, pid}
+
+	_, _, errno := syscall.Syscall6(
+		syscall.SYS___SYSCTL,
+		uintptr(unsafe.Pointer(&mib[0])),
+		uintptr(len(mib)),
+		uintptr(unsafe.Pointer(&buf[0])),
+		uintptr(unsafe.Pointer(&size)),
+		0,
+		0)
+	if errno != 0 || size == 0 {
+		return "", errno
+	}
+
+	return filepath.Base(string(buf[:size-1])), nil
+}
+
+func readNativeUint32(b []byte) uint32 {
+	return *(*uint32)(unsafe.Pointer(&b[0]))
+}
+
+type searcher struct {
+	// sizeof(struct xinpgen)
+	headSize int
+	// sizeof(struct xtcpcb)
+	tcpItemSize int
+	// sizeof(struct xinpcb)
+	udpItemSize  int
+	udpInpOffset int
+	port         int
+	ip           int
+	vflag        int
+	socket       int
+
+	// sizeof(struct xfile)
+	fileItemSize int
+	data         int
+	pid          int
+}
+
+func (s *searcher) Search(buf []byte, ip net.IP, port uint16, isTCP bool) (uint32, error) {
+	var itemSize int
+	var inpOffset int
+
+	if isTCP {
+		// struct xtcpcb
+		itemSize = s.tcpItemSize
+		inpOffset = 8
+	} else {
+		// struct xinpcb
+		itemSize = s.udpItemSize
+		inpOffset = s.udpInpOffset
+	}
+
+	isIPv4 := ip.To4() != nil
+	// skip the first xinpgen block
+	for i := s.headSize; i+itemSize <= len(buf); i += itemSize {
+		inp := i + inpOffset
+
+		srcPort := binary.BigEndian.Uint16(buf[inp+s.port : inp+s.port+2])
+
+		if port != srcPort {
+			continue
+		}
+
+		// xinpcb.inp_vflag
+		flag := buf[inp+s.vflag]
+
+		var srcIP net.IP
+		switch {
+		case flag&0x1 > 0 && isIPv4:
+			// ipv4
+			srcIP = net.IP(buf[inp+s.ip : inp+s.ip+4])
+		case flag&0x2 > 0 && !isIPv4:
+			// ipv6
+			srcIP = net.IP(buf[inp+s.ip-12 : inp+s.ip+4])
+		default:
+			continue
+		}
+
+		if !ip.Equal(srcIP) {
+			continue
+		}
+
+		// xsocket.xso_so, interpreted as big endian anyway since it's only used for comparison
+		socket := binary.BigEndian.Uint64(buf[inp+s.socket : inp+s.socket+8])
+		return s.searchSocketPid(socket)
+	}
+	return 0, ErrNotFound
+}
+
+func (s *searcher) searchSocketPid(socket uint64) (uint32, error) {
+	value, err := syscall.Sysctl("kern.file")
+	if err != nil {
+		return 0, err
+	}
+
+	buf := []byte(value)
+
+	// struct xfile
+	itemSize := s.fileItemSize
+	for i := 0; i+itemSize <= len(buf); i += itemSize {
+		// xfile.xf_data
+		data := binary.BigEndian.Uint64(buf[i+s.data : i+s.data+8])
+		if data == socket {
+			// xfile.xf_pid
+			pid := readNativeUint32(buf[i+s.pid : i+s.pid+4])
+			return pid, nil
+		}
+	}
+	return 0, ErrNotFound
+}
+
+func newSearcher(major int) *searcher {
+	var s *searcher = nil
+	switch major {
+	case 11:
+		s = &searcher{
+			headSize:     32,
+			tcpItemSize:  1304,
+			udpItemSize:  632,
+			port:         198,
+			ip:           228,
+			vflag:        116,
+			socket:       88,
+			fileItemSize: 80,
+			data:         56,
+			pid:          8,
+			udpInpOffset: 8,
+		}
+	case 12:
+		s = &searcher{
+			headSize:     64,
+			tcpItemSize:  744,
+			udpItemSize:  400,
+			port:         254,
+			ip:           284,
+			vflag:        392,
+			socket:       16,
+			fileItemSize: 128,
+			data:         56,
+			pid:          8,
+		}
+	}
+	return s
+}
+
+func initSearcher() error {
+	osRelease, err := syscall.Sysctl("kern.osrelease")
+	if err != nil {
+		return err
+	}
+
+	dot := strings.Index(osRelease, ".")
+	if dot != -1 {
+		osRelease = osRelease[:dot]
+	}
+	major, err := strconv.Atoi(osRelease)
+	if err != nil {
+		return err
+	}
+	defaultSearcher = newSearcher(major)
+	if defaultSearcher == nil {
+		return fmt.Errorf("unsupported freebsd version %d", major)
+	}
+	return nil
+}

component/process/process_linux.go

@@ -0,0 +1,238 @@
+package process
+
+import (
+	"bytes"
+	"encoding/binary"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net"
+	"path"
+	"path/filepath"
+	"syscall"
+	"unsafe"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+// from https://github.com/vishvananda/netlink/blob/bca67dfc8220b44ef582c9da4e9172bf1c9ec973/nl/nl_linux.go#L52-L62
+func init() {
+	var x uint32 = 0x01020304
+	if *(*byte)(unsafe.Pointer(&x)) == 0x01 {
+		nativeEndian = binary.BigEndian
+	} else {
+		nativeEndian = binary.LittleEndian
+	}
+}
+
+type SocketResolver func(network string, ip net.IP, srcPort int) (inode, uid int, err error)
+type ProcessNameResolver func(inode, uid int) (name string, err error)
+
+// export for android
+var (
+	DefaultSocketResolver      SocketResolver      = resolveSocketByNetlink
+	DefaultProcessNameResolver ProcessNameResolver = resolveProcessNameByProcSearch
+)
+
+const (
+	sizeOfSocketDiagRequest = syscall.SizeofNlMsghdr + 8 + 48
+	socketDiagByFamily      = 20
+	pathProc                = "/proc"
+)
+
+var nativeEndian binary.ByteOrder = binary.LittleEndian
+
+func findProcessName(network string, ip net.IP, srcPort int) (string, error) {
+	inode, uid, err := DefaultSocketResolver(network, ip, srcPort)
+	if err != nil {
+		return "", err
+	}
+
+	return DefaultProcessNameResolver(inode, uid)
+}
+
+func resolveSocketByNetlink(network string, ip net.IP, srcPort int) (int, int, error) {
+	var family byte
+	var protocol byte
+
+	switch network {
+	case TCP:
+		protocol = syscall.IPPROTO_TCP
+	case UDP:
+		protocol = syscall.IPPROTO_UDP
+	default:
+		return 0, 0, ErrInvalidNetwork
+	}
+
+	if ip.To4() != nil {
+		family = syscall.AF_INET
+	} else {
+		family = syscall.AF_INET6
+	}
+
+	req := packSocketDiagRequest(family, protocol, ip, uint16(srcPort))
+
+	socket, err := syscall.Socket(syscall.AF_NETLINK, syscall.SOCK_DGRAM, syscall.NETLINK_INET_DIAG)
+	if err != nil {
+		return 0, 0, err
+	}
+	defer syscall.Close(socket)
+
+	syscall.SetNonblock(socket, true)
+	syscall.SetsockoptTimeval(socket, syscall.SOL_SOCKET, syscall.SO_SNDTIMEO, &syscall.Timeval{Usec: 50})
+	syscall.SetsockoptTimeval(socket, syscall.SOL_SOCKET, syscall.SO_RCVTIMEO, &syscall.Timeval{Usec: 50})
+
+	if err := syscall.Connect(socket, &syscall.SockaddrNetlink{
+		Family: syscall.AF_NETLINK,
+		Pad:    0,
+		Pid:    0,
+		Groups: 0,
+	}); err != nil {
+		return 0, 0, err
+	}
+
+	if _, err := syscall.Write(socket, req); err != nil {
+		return 0, 0, err
+	}
+
+	rb := pool.Get(pool.RelayBufferSize)
+	defer pool.Put(rb)
+
+	n, err := syscall.Read(socket, rb)
+	if err != nil {
+		return 0, 0, err
+	}
+
+	messages, err := syscall.ParseNetlinkMessage(rb[:n])
+	if err != nil {
+		return 0, 0, err
+	} else if len(messages) == 0 {
+		return 0, 0, io.ErrUnexpectedEOF
+	}
+
+	message := messages[0]
+	if message.Header.Type&syscall.NLMSG_ERROR != 0 {
+		return 0, 0, syscall.ESRCH
+	}
+
+	uid, inode := unpackSocketDiagResponse(&messages[0])
+
+	return int(uid), int(inode), nil
+}
+
+func packSocketDiagRequest(family, protocol byte, source net.IP, sourcePort uint16) []byte {
+	s := make([]byte, 16)
+
+	if v4 := source.To4(); v4 != nil {
+		copy(s, v4)
+	} else {
+		copy(s, source)
+	}
+
+	buf := make([]byte, sizeOfSocketDiagRequest)
+
+	nativeEndian.PutUint32(buf[0:4], sizeOfSocketDiagRequest)
+	nativeEndian.PutUint16(buf[4:6], socketDiagByFamily)
+	nativeEndian.PutUint16(buf[6:8], syscall.NLM_F_REQUEST|syscall.NLM_F_DUMP)
+	nativeEndian.PutUint32(buf[8:12], 0)
+	nativeEndian.PutUint32(buf[12:16], 0)
+
+	buf[16] = family
+	buf[17] = protocol
+	buf[18] = 0
+	buf[19] = 0
+	nativeEndian.PutUint32(buf[20:24], 0xFFFFFFFF)
+
+	binary.BigEndian.PutUint16(buf[24:26], sourcePort)
+	binary.BigEndian.PutUint16(buf[26:28], 0)
+
+	copy(buf[28:44], s)
+	copy(buf[44:60], net.IPv6zero)
+
+	nativeEndian.PutUint32(buf[60:64], 0)
+	nativeEndian.PutUint64(buf[64:72], 0xFFFFFFFFFFFFFFFF)
+
+	return buf
+}
+
+func unpackSocketDiagResponse(msg *syscall.NetlinkMessage) (inode, uid uint32) {
+	if len(msg.Data) < 72 {
+		return 0, 0
+	}
+
+	data := msg.Data
+
+	uid = nativeEndian.Uint32(data[64:68])
+	inode = nativeEndian.Uint32(data[68:72])
+
+	return
+}
+
+func resolveProcessNameByProcSearch(inode, uid int) (string, error) {
+	files, err := ioutil.ReadDir(pathProc)
+	if err != nil {
+		return "", err
+	}
+
+	buffer := make([]byte, syscall.PathMax)
+	socket := []byte(fmt.Sprintf("socket:[%d]", inode))
+
+	for _, f := range files {
+		if !f.IsDir() || !isPid(f.Name()) {
+			continue
+		}
+
+		if f.Sys().(*syscall.Stat_t).Uid != uint32(uid) {
+			continue
+		}
+
+		processPath := path.Join(pathProc, f.Name())
+		fdPath := path.Join(processPath, "fd")
+
+		fds, err := ioutil.ReadDir(fdPath)
+		if err != nil {
+			continue
+		}
+
+		for _, fd := range fds {
+			n, err := syscall.Readlink(path.Join(fdPath, fd.Name()), buffer)
+			if err != nil {
+				continue
+			}
+
+			if bytes.Equal(buffer[:n], socket) {
+				cmdline, err := ioutil.ReadFile(path.Join(processPath, "cmdline"))
+				if err != nil {
+					return "", err
+				}
+
+				return splitCmdline(cmdline), nil
+			}
+		}
+	}
+
+	return "", syscall.ESRCH
+}
+
+func splitCmdline(cmdline []byte) string {
+	indexOfEndOfString := len(cmdline)
+
+	for i, c := range cmdline {
+		if c == 0 {
+			indexOfEndOfString = i
+			break
+		}
+	}
+
+	return filepath.Base(string(cmdline[:indexOfEndOfString]))
+}
+
+func isPid(s string) bool {
+	for _, s := range s {
+		if s < '0' || s > '9' {
+			return false
+		}
+	}
+
+	return true
+}

component/process/process_other.go

@@ -0,0 +1,10 @@
+// +build !darwin,!linux,!windows
+// +build !freebsd !amd64
+
+package process
+
+import "net"
+
+func findProcessName(network string, ip net.IP, srcPort int) (string, error) {
+	return "", ErrPlatformNotSupport
+}

component/process/process_windows.go

@@ -0,0 +1,224 @@
+package process
+
+import (
+	"fmt"
+	"net"
+	"path/filepath"
+	"sync"
+	"syscall"
+	"unsafe"
+
+	"github.com/Dreamacro/clash/log"
+
+	"golang.org/x/sys/windows"
+)
+
+const (
+	tcpTableFunc      = "GetExtendedTcpTable"
+	tcpTablePidConn   = 4
+	udpTableFunc      = "GetExtendedUdpTable"
+	udpTablePid       = 1
+	queryProcNameFunc = "QueryFullProcessImageNameW"
+)
+
+var (
+	getExTcpTable uintptr
+	getExUdpTable uintptr
+	queryProcName uintptr
+
+	once sync.Once
+)
+
+func initWin32API() error {
+	h, err := windows.LoadLibrary("iphlpapi.dll")
+	if err != nil {
+		return fmt.Errorf("LoadLibrary iphlpapi.dll failed: %s", err.Error())
+	}
+
+	getExTcpTable, err = windows.GetProcAddress(h, tcpTableFunc)
+	if err != nil {
+		return fmt.Errorf("GetProcAddress of %s failed: %s", tcpTableFunc, err.Error())
+	}
+
+	getExUdpTable, err = windows.GetProcAddress(h, udpTableFunc)
+	if err != nil {
+		return fmt.Errorf("GetProcAddress of %s failed: %s", udpTableFunc, err.Error())
+	}
+
+	h, err = windows.LoadLibrary("kernel32.dll")
+	if err != nil {
+		return fmt.Errorf("LoadLibrary kernel32.dll failed: %s", err.Error())
+	}
+
+	queryProcName, err = windows.GetProcAddress(h, queryProcNameFunc)
+	if err != nil {
+		return fmt.Errorf("GetProcAddress of %s failed: %s", queryProcNameFunc, err.Error())
+	}
+
+	return nil
+}
+
+func findProcessName(network string, ip net.IP, srcPort int) (string, error) {
+	once.Do(func() {
+		err := initWin32API()
+		if err != nil {
+			log.Errorln("Initialize PROCESS-NAME failed: %s", err.Error())
+			log.Warnln("All PROCESS-NAMES rules will be skiped")
+			return
+		}
+	})
+	family := windows.AF_INET
+	if ip.To4() == nil {
+		family = windows.AF_INET6
+	}
+
+	var class int
+	var fn uintptr
+	switch network {
+	case TCP:
+		fn = getExTcpTable
+		class = tcpTablePidConn
+	case UDP:
+		fn = getExUdpTable
+		class = udpTablePid
+	default:
+		return "", ErrInvalidNetwork
+	}
+
+	buf, err := getTransportTable(fn, family, class)
+	if err != nil {
+		return "", err
+	}
+
+	s := newSearcher(family == windows.AF_INET, network == TCP)
+
+	pid, err := s.Search(buf, ip, uint16(srcPort))
+	if err != nil {
+		return "", err
+	}
+	return getExecPathFromPID(pid)
+}
+
+type searcher struct {
+	itemSize int
+	port     int
+	ip       int
+	ipSize   int
+	pid      int
+	tcpState int
+}
+
+func (s *searcher) Search(b []byte, ip net.IP, port uint16) (uint32, error) {
+	n := int(readNativeUint32(b[:4]))
+	itemSize := s.itemSize
+	for i := 0; i < n; i++ {
+		row := b[4+itemSize*i : 4+itemSize*(i+1)]
+
+		if s.tcpState >= 0 {
+			tcpState := readNativeUint32(row[s.tcpState : s.tcpState+4])
+			// MIB_TCP_STATE_ESTAB, only check established connections for TCP
+			if tcpState != 5 {
+				continue
+			}
+		}
+
+		// according to MSDN, only the lower 16 bits of dwLocalPort are used and the port number is in network endian.
+		// this field can be illustrated as follows depends on different machine endianess:
+		//     little endian: [ MSB LSB  0   0  ]   interpret as native uint32 is ((LSB<<8)|MSB)
+		//       big  endian: [  0   0  MSB LSB ]   interpret as native uint32 is ((MSB<<8)|LSB)
+		// so we need an syscall.Ntohs on the lower 16 bits after read the port as native uint32
+		srcPort := syscall.Ntohs(uint16(readNativeUint32(row[s.port : s.port+4])))
+		if srcPort != port {
+			continue
+		}
+
+		srcIP := net.IP(row[s.ip : s.ip+s.ipSize])
+		// windows binds an unbound udp socket to 0.0.0.0/[::] while first sendto
+		if !ip.Equal(srcIP) && (!srcIP.IsUnspecified() || s.tcpState != -1) {
+			continue
+		}
+
+		pid := readNativeUint32(row[s.pid : s.pid+4])
+		return pid, nil
+	}
+	return 0, ErrNotFound
+}
+
+func newSearcher(isV4, isTCP bool) *searcher {
+	var itemSize, port, ip, ipSize, pid int
+	tcpState := -1
+	switch {
+	case isV4 && isTCP:
+		// struct MIB_TCPROW_OWNER_PID
+		itemSize, port, ip, ipSize, pid, tcpState = 24, 8, 4, 4, 20, 0
+	case isV4 && !isTCP:
+		// struct MIB_UDPROW_OWNER_PID
+		itemSize, port, ip, ipSize, pid = 12, 4, 0, 4, 8
+	case !isV4 && isTCP:
+		// struct MIB_TCP6ROW_OWNER_PID
+		itemSize, port, ip, ipSize, pid, tcpState = 56, 20, 0, 16, 52, 48
+	case !isV4 && !isTCP:
+		// struct MIB_UDP6ROW_OWNER_PID
+		itemSize, port, ip, ipSize, pid = 28, 20, 0, 16, 24
+	}
+
+	return &searcher{
+		itemSize: itemSize,
+		port:     port,
+		ip:       ip,
+		ipSize:   ipSize,
+		pid:      pid,
+		tcpState: tcpState,
+	}
+}
+
+func getTransportTable(fn uintptr, family int, class int) ([]byte, error) {
+	for size, buf := uint32(8), make([]byte, 8); ; {
+		ptr := unsafe.Pointer(&buf[0])
+		err, _, _ := syscall.Syscall6(fn, 6, uintptr(ptr), uintptr(unsafe.Pointer(&size)), 0, uintptr(family), uintptr(class), 0)
+
+		switch err {
+		case 0:
+			return buf, nil
+		case uintptr(syscall.ERROR_INSUFFICIENT_BUFFER):
+			buf = make([]byte, size)
+		default:
+			return nil, fmt.Errorf("syscall error: %d", err)
+		}
+	}
+}
+
+func readNativeUint32(b []byte) uint32 {
+	return *(*uint32)(unsafe.Pointer(&b[0]))
+}
+
+func getExecPathFromPID(pid uint32) (string, error) {
+	// kernel process starts with a colon in order to distinguish with normal processes
+	switch pid {
+	case 0:
+		// reserved pid for system idle process
+		return ":System Idle Process", nil
+	case 4:
+		// reserved pid for windows kernel image
+		return ":System", nil
+	}
+	h, err := windows.OpenProcess(windows.PROCESS_QUERY_LIMITED_INFORMATION, false, pid)
+	if err != nil {
+		return "", err
+	}
+	defer windows.CloseHandle(h)
+
+	buf := make([]uint16, syscall.MAX_LONG_PATH)
+	size := uint32(len(buf))
+	r1, _, err := syscall.Syscall6(
+		queryProcName, 4,
+		uintptr(h),
+		uintptr(1),
+		uintptr(unsafe.Pointer(&buf[0])),
+		uintptr(unsafe.Pointer(&size)),
+		0, 0)
+	if r1 == 0 {
+		return "", err
+	}
+	return filepath.Base(syscall.UTF16ToString(buf[:size])), nil
+}

component/profile/cachefile/cache.go

@@ -0,0 +1,115 @@
+package cachefile
+
+import (
+	"bytes"
+	"encoding/gob"
+	"io/ioutil"
+	"os"
+	"sync"
+
+	"github.com/Dreamacro/clash/component/profile"
+	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/log"
+)
+
+var (
+	initOnce     sync.Once
+	fileMode     os.FileMode = 0666
+	defaultCache *CacheFile
+)
+
+type cache struct {
+	Selected map[string]string
+}
+
+// CacheFile store and update the cache file
+type CacheFile struct {
+	path  string
+	model *cache
+	enc   *gob.Encoder
+	buf   *bytes.Buffer
+	mux   sync.Mutex
+}
+
+func (c *CacheFile) SetSelected(group, selected string) {
+	if !profile.StoreSelected.Load() {
+		return
+	}
+
+	c.mux.Lock()
+	defer c.mux.Unlock()
+
+	model, err := c.element()
+	if err != nil {
+		log.Warnln("[CacheFile] read cache %s failed: %s", c.path, err.Error())
+		return
+	}
+
+	model.Selected[group] = selected
+	c.buf.Reset()
+	if err := c.enc.Encode(model); err != nil {
+		log.Warnln("[CacheFile] encode gob failed: %s", err.Error())
+		return
+	}
+
+	if err := ioutil.WriteFile(c.path, c.buf.Bytes(), fileMode); err != nil {
+		log.Warnln("[CacheFile] write cache to %s failed: %s", c.path, err.Error())
+		return
+	}
+}
+
+func (c *CacheFile) SelectedMap() map[string]string {
+	if !profile.StoreSelected.Load() {
+		return nil
+	}
+
+	c.mux.Lock()
+	defer c.mux.Unlock()
+
+	model, err := c.element()
+	if err != nil {
+		log.Warnln("[CacheFile] read cache %s failed: %s", c.path, err.Error())
+		return nil
+	}
+
+	mapping := map[string]string{}
+	for k, v := range model.Selected {
+		mapping[k] = v
+	}
+	return mapping
+}
+
+func (c *CacheFile) element() (*cache, error) {
+	if c.model != nil {
+		return c.model, nil
+	}
+
+	model := &cache{
+		Selected: map[string]string{},
+	}
+
+	if buf, err := ioutil.ReadFile(c.path); err == nil {
+		bufReader := bytes.NewBuffer(buf)
+		dec := gob.NewDecoder(bufReader)
+		if err := dec.Decode(model); err != nil {
+			return nil, err
+		}
+	}
+
+	c.model = model
+	return c.model, nil
+}
+
+// Cache return singleton of CacheFile
+func Cache() *CacheFile {
+	initOnce.Do(func() {
+		buf := &bytes.Buffer{}
+		defaultCache = &CacheFile{
+			path: C.Path.Cache(),
+			buf:  buf,
+			enc:  gob.NewEncoder(buf),
+		}
+	})
+
+	return defaultCache
+}

component/profile/profile.go

@@ -0,0 +1,10 @@
+package profile
+
+import (
+	"go.uber.org/atomic"
+)
+
+var (
+	// StoreSelected is a global switch for storing selected proxy to cache
+	StoreSelected = atomic.NewBool(true)
+)

component/resolver/enhancer.go

@@ -0,0 +1,55 @@
+package resolver
+
+import (
+	"net"
+)
+
+var DefaultHostMapper Enhancer
+
+type Enhancer interface {
+	FakeIPEnabled() bool
+	MappingEnabled() bool
+	IsFakeIP(net.IP) bool
+	IsExistFakeIP(net.IP) bool
+	FindHostByIP(net.IP) (string, bool)
+}
+
+func FakeIPEnabled() bool {
+	if mapper := DefaultHostMapper; mapper != nil {
+		return mapper.FakeIPEnabled()
+	}
+
+	return false
+}
+
+func MappingEnabled() bool {
+	if mapper := DefaultHostMapper; mapper != nil {
+		return mapper.MappingEnabled()
+	}
+
+	return false
+}
+
+func IsFakeIP(ip net.IP) bool {
+	if mapper := DefaultHostMapper; mapper != nil {
+		return mapper.IsFakeIP(ip)
+	}
+
+	return false
+}
+
+func IsExistFakeIP(ip net.IP) bool {
+	if mapper := DefaultHostMapper; mapper != nil {
+		return mapper.IsExistFakeIP(ip)
+	}
+
+	return false
+}
+
+func FindHostByIP(ip net.IP) (string, bool) {
+	if mapper := DefaultHostMapper; mapper != nil {
+		return mapper.FindHostByIP(ip)
+	}
+
+	return "", false
+}

component/simple-obfs/http.go

@@ -28,6 +28,7 @@ func (ho *HTTPObfs) Read(b []byte) (int, error) {
 		n := copy(b, ho.buf[ho.offset:])
 		ho.offset += n
 		if ho.offset == len(ho.buf) {
+			pool.Put(ho.buf)
 			ho.buf = nil
 		}
 		return n, nil
@@ -67,7 +68,10 @@ func (ho *HTTPObfs) Write(b []byte) (int, error) {
 		req.Header.Set("User-Agent", fmt.Sprintf("curl/7.%d.%d", rand.Int()%54, rand.Int()%2))
 		req.Header.Set("Upgrade", "websocket")
 		req.Header.Set("Connection", "Upgrade")
-		req.Host = fmt.Sprintf("%s:%s", ho.host, ho.port)
+		req.Host = ho.host
+		if ho.port != "80" {
+			req.Host = fmt.Sprintf("%s:%s", ho.host, ho.port)
+		}
 		req.Header.Set("Sec-WebSocket-Key", base64.URLEncoding.EncodeToString(randBytes))
 		req.ContentLength = int64(len(b))
 		err := req.Write(ho.Conn)

component/snell/cipher.go

@@ -1,21 +1,54 @@
 package snell
 
 import (
+	"crypto/aes"
 	"crypto/cipher"
 
+	"github.com/Dreamacro/go-shadowsocks2/shadowaead"
 	"golang.org/x/crypto/argon2"
+	"golang.org/x/crypto/chacha20poly1305"
 )
 
 type snellCipher struct {
 	psk      []byte
+	keySize  int
 	makeAEAD func(key []byte) (cipher.AEAD, error)
 }
 
-func (sc *snellCipher) KeySize() int  { return 32 }
+func (sc *snellCipher) KeySize() int  { return sc.keySize }
 func (sc *snellCipher) SaltSize() int { return 16 }
 func (sc *snellCipher) Encrypter(salt []byte) (cipher.AEAD, error) {
-	return sc.makeAEAD(argon2.IDKey(sc.psk, salt, 3, 8, 1, uint32(sc.KeySize())))
+	return sc.makeAEAD(snellKDF(sc.psk, salt, sc.KeySize()))
 }
 func (sc *snellCipher) Decrypter(salt []byte) (cipher.AEAD, error) {
-	return sc.makeAEAD(argon2.IDKey(sc.psk, salt, 3, 8, 1, uint32(sc.KeySize())))
+	return sc.makeAEAD(snellKDF(sc.psk, salt, sc.KeySize()))
+}
+
+func snellKDF(psk, salt []byte, keySize int) []byte {
+	// snell use a special kdf function
+	return argon2.IDKey(psk, salt, 3, 8, 1, 32)[:keySize]
+}
+
+func aesGCM(key []byte) (cipher.AEAD, error) {
+	blk, err := aes.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	return cipher.NewGCM(blk)
+}
+
+func NewAES128GCM(psk []byte) shadowaead.Cipher {
+	return &snellCipher{
+		psk:      psk,
+		keySize:  16,
+		makeAEAD: aesGCM,
+	}
+}
+
+func NewChacha20Poly1305(psk []byte) shadowaead.Cipher {
+	return &snellCipher{
+		psk:      psk,
+		keySize:  32,
+		makeAEAD: chacha20poly1305.New,
+	}
 }

component/snell/pool.go

@@ -0,0 +1,80 @@
+package snell
+
+import (
+	"context"
+	"net"
+
+	"github.com/Dreamacro/clash/component/pool"
+	"github.com/Dreamacro/go-shadowsocks2/shadowaead"
+)
+
+type Pool struct {
+	pool *pool.Pool
+}
+
+func (p *Pool) Get() (net.Conn, error) {
+	return p.GetContext(context.Background())
+}
+
+func (p *Pool) GetContext(ctx context.Context) (net.Conn, error) {
+	elm, err := p.pool.GetContext(ctx)
+	if err != nil {
+		return nil, err
+	}
+
+	return &PoolConn{elm.(*Snell), p}, nil
+}
+
+func (p *Pool) Put(conn net.Conn) {
+	if err := HalfClose(conn); err != nil {
+		conn.Close()
+		return
+	}
+
+	p.pool.Put(conn)
+}
+
+type PoolConn struct {
+	*Snell
+	pool *Pool
+}
+
+func (pc *PoolConn) Read(b []byte) (int, error) {
+	// save old status of reply (it mutable by Read)
+	reply := pc.Snell.reply
+
+	n, err := pc.Snell.Read(b)
+	if err == shadowaead.ErrZeroChunk {
+		// if reply is false, it should be client halfclose.
+		// ignore error and read data again.
+		if !reply {
+			pc.Snell.reply = false
+			return pc.Snell.Read(b)
+		}
+	}
+	return n, err
+}
+
+func (pc *PoolConn) Write(b []byte) (int, error) {
+	return pc.Snell.Write(b)
+}
+
+func (pc *PoolConn) Close() error {
+	pc.pool.Put(pc.Snell)
+	return nil
+}
+
+func NewPool(factory func(context.Context) (*Snell, error)) *Pool {
+	p := pool.New(
+		func(ctx context.Context) (interface{}, error) {
+			return factory(ctx)
+		},
+		pool.WithAge(15000),
+		pool.WithSize(10),
+		pool.WithEvict(func(item interface{}) {
+			item.(*Snell).Close()
+		}),
+	)
+
+	return &Pool{p}
+}

component/snell/snell.go

@@ -4,19 +4,27 @@ import (
 	"bytes"
 	"encoding/binary"
 	"errors"
+	"fmt"
 	"io"
 	"net"
 	"sync"
 
 	"github.com/Dreamacro/go-shadowsocks2/shadowaead"
-	"golang.org/x/crypto/chacha20poly1305"
 )
 
 const (
-	CommandPing    byte = 0
-	CommandConnect byte = 1
+	Version1            = 1
+	Version2            = 2
+	DefaultSnellVersion = Version1
+)
+
+const (
+	CommandPing      byte = 0
+	CommandConnect   byte = 1
+	CommandConnectV2 byte = 5
 
 	CommandTunnel byte = 0
+	CommandPong   byte = 1
 	CommandError  byte = 2
 
 	Version byte = 1
@@ -24,6 +32,7 @@ const (
 
 var (
 	bufferPool = sync.Pool{New: func() interface{} { return &bytes.Buffer{} }}
+	endSignal  = []byte{}
 )
 
 type Snell struct {
@@ -45,14 +54,20 @@ func (s *Snell) Read(b []byte) (int, error) {
 	if s.buffer[0] == CommandTunnel {
 		return s.Conn.Read(b)
 	} else if s.buffer[0] != CommandError {
-		return 0, errors.New("Command not support")
+		return 0, errors.New("command not support")
 	}
 
 	// CommandError
+	// 1 byte error code
 	if _, err := io.ReadFull(s.Conn, s.buffer[:]); err != nil {
 		return 0, err
 	}
+	errcode := int(s.buffer[0])
 
+	// 1 byte error message length
+	if _, err := io.ReadFull(s.Conn, s.buffer[:]); err != nil {
+		return 0, err
+	}
 	length := int(s.buffer[0])
 	msg := make([]byte, length)
 
@@ -60,15 +75,19 @@ func (s *Snell) Read(b []byte) (int, error) {
 		return 0, err
 	}
 
-	return 0, errors.New(string(msg))
+	return 0, fmt.Errorf("server reported code: %d, message: %s", errcode, string(msg))
 }
 
-func WriteHeader(conn net.Conn, host string, port uint) error {
+func WriteHeader(conn net.Conn, host string, port uint, version int) error {
 	buf := bufferPool.Get().(*bytes.Buffer)
 	buf.Reset()
 	defer bufferPool.Put(buf)
 	buf.WriteByte(Version)
-	buf.WriteByte(CommandConnect)
+	if version == Version2 {
+		buf.WriteByte(CommandConnectV2)
+	} else {
+		buf.WriteByte(CommandConnect)
+	}
 
 	// clientID length & id
 	buf.WriteByte(0)
@@ -85,7 +104,24 @@ func WriteHeader(conn net.Conn, host string, port uint) error {
 	return nil
 }
 
-func StreamConn(conn net.Conn, psk []byte) net.Conn {
-	cipher := &snellCipher{psk, chacha20poly1305.New}
+// HalfClose works only on version2
+func HalfClose(conn net.Conn) error {
+	if _, err := conn.Write(endSignal); err != nil {
+		return err
+	}
+
+	if s, ok := conn.(*Snell); ok {
+		s.reply = false
+	}
+	return nil
+}
+
+func StreamConn(conn net.Conn, psk []byte, version int) *Snell {
+	var cipher shadowaead.Cipher
+	if version == Version2 {
+		cipher = NewAES128GCM(psk)
+	} else {
+		cipher = NewChacha20Poly1305(psk)
+	}
 	return &Snell{Conn: shadowaead.NewConn(conn, cipher)}
 }

component/ssr/obfs/base.go

@@ -0,0 +1,9 @@
+package obfs
+
+type Base struct {
+	Host   string
+	Port   int
+	Key    []byte
+	IVSize int
+	Param  string
+}

component/ssr/obfs/http_post.go

@@ -0,0 +1,9 @@
+package obfs
+
+func init() {
+	register("http_post", newHTTPPost, 0)
+}
+
+func newHTTPPost(b *Base) Obfs {
+	return &httpObfs{Base: b, post: true}
+}

component/ssr/obfs/http_simple.go

@@ -0,0 +1,407 @@
+package obfs
+
+import (
+	"bytes"
+	"encoding/hex"
+	"io"
+	"math/rand"
+	"net"
+	"strconv"
+	"strings"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/component/ssr/tools"
+)
+
+func init() {
+	register("http_simple", newHTTPSimple, 0)
+}
+
+type httpObfs struct {
+	*Base
+	post bool
+}
+
+func newHTTPSimple(b *Base) Obfs {
+	return &httpObfs{Base: b}
+}
+
+type httpConn struct {
+	net.Conn
+	*httpObfs
+	hasSentHeader bool
+	hasRecvHeader bool
+	buf           []byte
+}
+
+func (h *httpObfs) StreamConn(c net.Conn) net.Conn {
+	return &httpConn{Conn: c, httpObfs: h}
+}
+
+func (c *httpConn) Read(b []byte) (int, error) {
+	if c.buf != nil {
+		n := copy(b, c.buf)
+		if n == len(c.buf) {
+			c.buf = nil
+		} else {
+			c.buf = c.buf[n:]
+		}
+		return n, nil
+	}
+
+	if c.hasRecvHeader {
+		return c.Conn.Read(b)
+	}
+
+	buf := pool.Get(pool.RelayBufferSize)
+	defer pool.Put(buf)
+	n, err := c.Conn.Read(buf)
+	if err != nil {
+		return 0, err
+	}
+	pos := bytes.Index(buf[:n], []byte("\r\n\r\n"))
+	if pos == -1 {
+		return 0, io.EOF
+	}
+	c.hasRecvHeader = true
+	dataLength := n - pos - 4
+	n = copy(b, buf[4+pos:n])
+	if dataLength > n {
+		c.buf = append(c.buf, buf[4+pos+n:4+pos+dataLength]...)
+	}
+	return n, nil
+}
+
+func (c *httpConn) Write(b []byte) (int, error) {
+	if c.hasSentHeader {
+		return c.Conn.Write(b)
+	}
+	// 30: head length
+	headLength := c.IVSize + 30
+
+	bLength := len(b)
+	headDataLength := bLength
+	if bLength-headLength > 64 {
+		headDataLength = headLength + rand.Intn(65)
+	}
+	headData := b[:headDataLength]
+	b = b[headDataLength:]
+
+	var body string
+	host := c.Host
+	if len(c.Param) > 0 {
+		pos := strings.Index(c.Param, "#")
+		if pos != -1 {
+			body = strings.ReplaceAll(c.Param[pos+1:], "\n", "\r\n")
+			body = strings.ReplaceAll(body, "\\n", "\r\n")
+			host = c.Param[:pos]
+		} else {
+			host = c.Param
+		}
+	}
+	hosts := strings.Split(host, ",")
+	host = hosts[rand.Intn(len(hosts))]
+
+	buf := tools.BufPool.Get().(*bytes.Buffer)
+	defer tools.BufPool.Put(buf)
+	defer buf.Reset()
+	if c.post {
+		buf.WriteString("POST /")
+	} else {
+		buf.WriteString("GET /")
+	}
+	packURLEncodedHeadData(buf, headData)
+	buf.WriteString(" HTTP/1.1\r\nHost: " + host)
+	if c.Port != 80 {
+		buf.WriteString(":" + strconv.Itoa(c.Port))
+	}
+	buf.WriteString("\r\n")
+	if len(body) > 0 {
+		buf.WriteString(body + "\r\n\r\n")
+	} else {
+		buf.WriteString("User-Agent: ")
+		buf.WriteString(userAgent[rand.Intn(len(userAgent))])
+		buf.WriteString("\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8\r\nAccept-Language: en-US,en;q=0.8\r\nAccept-Encoding: gzip, deflate\r\n")
+		if c.post {
+			packBoundary(buf)
+		}
+		buf.WriteString("DNT: 1\r\nConnection: keep-alive\r\n\r\n")
+	}
+	buf.Write(b)
+	_, err := c.Conn.Write(buf.Bytes())
+	if err != nil {
+		return 0, nil
+	}
+	c.hasSentHeader = true
+	return bLength, nil
+}
+
+func packURLEncodedHeadData(buf *bytes.Buffer, data []byte) {
+	dataLength := len(data)
+	for i := 0; i < dataLength; i++ {
+		buf.WriteRune('%')
+		buf.WriteString(hex.EncodeToString(data[i : i+1]))
+	}
+}
+
+func packBoundary(buf *bytes.Buffer) {
+	buf.WriteString("Content-Type: multipart/form-data; boundary=")
+	set := "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"
+	for i := 0; i < 32; i++ {
+		buf.WriteByte(set[rand.Intn(62)])
+	}
+	buf.WriteString("\r\n")
+}
+
+var userAgent = []string{
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.162 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.85 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 7.0; Moto C Build/NRD90M.059) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 6.0.1; SM-G532M Build/MMB29T; wv) AppleWebKit/537.36 (KHTML, like Gecko) Version/4.0 Chrome/55.0.2883.91 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.2; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.111 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.94 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 5.1.1; SM-J120M Build/LMY47X) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 7.0; Moto G (5) Build/NPPS25.137-93-14) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 7.0; SM-G570M) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.80 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 5.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 6.0; CAM-L03 Build/HUAWEICAM-L03) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.76 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36",
+	"Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.63 Safari/534.3",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/47.0.2526.106 Safari/537.36",
+	"Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.7 (KHTML, like Gecko) Chrome/7.0.517.44 Safari/534.7",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.75 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36",
+	"Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.3 (KHTML, like Gecko) Chrome/6.0.472.63 Safari/534.3",
+	"Mozilla/5.0 (Linux; Android 8.0.0; FIG-LX3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.80 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/40.0.2214.115 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36",
+	"Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.10 (KHTML, like Gecko) Chrome/8.0.552.237 Safari/534.10",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36",
+	"Mozilla/5.0 (X11; U; Linux x86_64; en-US) AppleWebKit/533.2 (KHTML, like Gecko) Chrome/5.0.342.1 Safari/533.2",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.110 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.89 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.81 Safari/537.36",
+	"Mozilla/5.0 (X11; Datanyze; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.132 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.71 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/35.0.1916.153 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 5.1.1; SM-J111M Build/LMY47V) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/37.0.2062.120 Safari/537.36",
+	"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/32.0.1700.107 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 6.0.1; SM-J700M Build/MMB29K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.63 Safari/537.36",
+	"Mozilla/5.0 (X11; Linux i686) AppleWebKit/534.30 (KHTML, like Gecko) Slackware/Chrome/12.0.742.100 Safari/534.30",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.86 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.167 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.116 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.143 Safari/537.36",
+	"Mozilla/5.0 (X11; Linux i686) AppleWebKit/534.30 (KHTML, like Gecko) Chrome/12.0.742.100 Safari/534.30",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 8.0.0; WAS-LX3 Build/HUAWEIWAS-LX3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/54.0.2840.99 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.87 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.102 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36",
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+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.90 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.31 (KHTML, like Gecko) Chrome/26.0.1410.64 Safari/537.31",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.84 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/57.0.2987.133 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/55.0.2883.87 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/36.0.1985.143 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/49.0.2623.112 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/65.0.3325.181 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.181 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.99 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/52.0.2743.116 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.106 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.3; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/69.0.3497.100 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 6.0.1; SM-G532G Build/MMB29T) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/63.0.3239.83 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/48.0.2564.109 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.117 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/34.0.1847.131 Safari/537.36",
+	"Mozilla/5.0 (Linux; Android 6.0; vivo 1713 Build/MRA58K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.124 Mobile Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/62.0.3202.89 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/41.0.2272.101 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.67 Safari/537.36",
+	"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36",
+}

component/ssr/obfs/obfs.go

@@ -0,0 +1,42 @@
+package obfs
+
+import (
+	"errors"
+	"fmt"
+	"net"
+)
+
+var (
+	errTLS12TicketAuthIncorrectMagicNumber = errors.New("tls1.2_ticket_auth incorrect magic number")
+	errTLS12TicketAuthTooShortData         = errors.New("tls1.2_ticket_auth too short data")
+	errTLS12TicketAuthHMACError            = errors.New("tls1.2_ticket_auth hmac verifying failed")
+)
+
+type authData struct {
+	clientID [32]byte
+}
+
+type Obfs interface {
+	StreamConn(net.Conn) net.Conn
+}
+
+type obfsCreator func(b *Base) Obfs
+
+var obfsList = make(map[string]struct {
+	overhead int
+	new      obfsCreator
+})
+
+func register(name string, c obfsCreator, o int) {
+	obfsList[name] = struct {
+		overhead int
+		new      obfsCreator
+	}{overhead: o, new: c}
+}
+
+func PickObfs(name string, b *Base) (Obfs, int, error) {
+	if choice, ok := obfsList[name]; ok {
+		return choice.new(b), choice.overhead, nil
+	}
+	return nil, 0, fmt.Errorf("Obfs %s not supported", name)
+}

component/ssr/obfs/plain.go

@@ -0,0 +1,15 @@
+package obfs
+
+import "net"
+
+type plain struct{}
+
+func init() {
+	register("plain", newPlain, 0)
+}
+
+func newPlain(b *Base) Obfs {
+	return &plain{}
+}
+
+func (p *plain) StreamConn(c net.Conn) net.Conn { return c }

component/ssr/obfs/random_head.go

@@ -0,0 +1,71 @@
+package obfs
+
+import (
+	"encoding/binary"
+	"hash/crc32"
+	"math/rand"
+	"net"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+func init() {
+	register("random_head", newRandomHead, 0)
+}
+
+type randomHead struct {
+	*Base
+}
+
+func newRandomHead(b *Base) Obfs {
+	return &randomHead{Base: b}
+}
+
+type randomHeadConn struct {
+	net.Conn
+	*randomHead
+	hasSentHeader bool
+	rawTransSent  bool
+	rawTransRecv  bool
+	buf           []byte
+}
+
+func (r *randomHead) StreamConn(c net.Conn) net.Conn {
+	return &randomHeadConn{Conn: c, randomHead: r}
+}
+
+func (c *randomHeadConn) Read(b []byte) (int, error) {
+	if c.rawTransRecv {
+		return c.Conn.Read(b)
+	}
+	buf := pool.Get(pool.RelayBufferSize)
+	defer pool.Put(buf)
+	c.Conn.Read(buf)
+	c.rawTransRecv = true
+	c.Write(nil)
+	return 0, nil
+}
+
+func (c *randomHeadConn) Write(b []byte) (int, error) {
+	if c.rawTransSent {
+		return c.Conn.Write(b)
+	}
+	c.buf = append(c.buf, b...)
+	if !c.hasSentHeader {
+		c.hasSentHeader = true
+		dataLength := rand.Intn(96) + 4
+		buf := pool.Get(dataLength + 4)
+		defer pool.Put(buf)
+		rand.Read(buf[:dataLength])
+		binary.LittleEndian.PutUint32(buf[dataLength:], 0xffffffff-crc32.ChecksumIEEE(buf[:dataLength]))
+		_, err := c.Conn.Write(buf)
+		return len(b), err
+	}
+	if c.rawTransRecv {
+		_, err := c.Conn.Write(c.buf)
+		c.buf = nil
+		c.rawTransSent = true
+		return len(b), err
+	}
+	return len(b), nil
+}

component/ssr/obfs/tls1.2_ticket_auth.go

@@ -0,0 +1,231 @@
+package obfs
+
+import (
+	"bytes"
+	"crypto/hmac"
+	"encoding/binary"
+	"math/rand"
+	"net"
+	"strings"
+	"time"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/component/ssr/tools"
+)
+
+func init() {
+	register("tls1.2_ticket_auth", newTLS12Ticket, 5)
+	register("tls1.2_ticket_fastauth", newTLS12Ticket, 5)
+}
+
+type tls12Ticket struct {
+	*Base
+	*authData
+}
+
+func newTLS12Ticket(b *Base) Obfs {
+	r := &tls12Ticket{Base: b, authData: &authData{}}
+	rand.Read(r.clientID[:])
+	return r
+}
+
+type tls12TicketConn struct {
+	net.Conn
+	*tls12Ticket
+	handshakeStatus int
+	decoded         bytes.Buffer
+	underDecoded    bytes.Buffer
+	sendBuf         bytes.Buffer
+}
+
+func (t *tls12Ticket) StreamConn(c net.Conn) net.Conn {
+	return &tls12TicketConn{Conn: c, tls12Ticket: t}
+}
+
+func (c *tls12TicketConn) Read(b []byte) (int, error) {
+	if c.decoded.Len() > 0 {
+		return c.decoded.Read(b)
+	}
+
+	buf := pool.Get(pool.RelayBufferSize)
+	defer pool.Put(buf)
+	n, err := c.Conn.Read(buf)
+	if err != nil {
+		return 0, err
+	}
+
+	if c.handshakeStatus == 8 {
+		c.underDecoded.Write(buf[:n])
+		for c.underDecoded.Len() > 5 {
+			if !bytes.Equal(c.underDecoded.Bytes()[:3], []byte{0x17, 3, 3}) {
+				c.underDecoded.Reset()
+				return 0, errTLS12TicketAuthIncorrectMagicNumber
+			}
+			size := int(binary.BigEndian.Uint16(c.underDecoded.Bytes()[3:5]))
+			if c.underDecoded.Len() < 5+size {
+				break
+			}
+			c.underDecoded.Next(5)
+			c.decoded.Write(c.underDecoded.Next(size))
+		}
+		n, _ = c.decoded.Read(b)
+		return n, nil
+	}
+
+	if n < 11+32+1+32 {
+		return 0, errTLS12TicketAuthTooShortData
+	}
+
+	if !hmac.Equal(buf[33:43], c.hmacSHA1(buf[11:33])[:10]) || !hmac.Equal(buf[n-10:n], c.hmacSHA1(buf[:n-10])[:10]) {
+		return 0, errTLS12TicketAuthHMACError
+	}
+
+	c.Write(nil)
+	return 0, nil
+}
+
+func (c *tls12TicketConn) Write(b []byte) (int, error) {
+	length := len(b)
+	if c.handshakeStatus == 8 {
+		buf := tools.BufPool.Get().(*bytes.Buffer)
+		defer tools.BufPool.Put(buf)
+		defer buf.Reset()
+		for len(b) > 2048 {
+			size := rand.Intn(4096) + 100
+			if len(b) < size {
+				size = len(b)
+			}
+			packData(buf, b[:size])
+			b = b[size:]
+		}
+		if len(b) > 0 {
+			packData(buf, b)
+		}
+		_, err := c.Conn.Write(buf.Bytes())
+		if err != nil {
+			return 0, err
+		}
+		return length, nil
+	}
+
+	if len(b) > 0 {
+		packData(&c.sendBuf, b)
+	}
+
+	if c.handshakeStatus == 0 {
+		c.handshakeStatus = 1
+
+		data := tools.BufPool.Get().(*bytes.Buffer)
+		defer tools.BufPool.Put(data)
+		defer data.Reset()
+
+		data.Write([]byte{3, 3})
+		c.packAuthData(data)
+		data.WriteByte(0x20)
+		data.Write(c.clientID[:])
+		data.Write([]byte{0x00, 0x1c, 0xc0, 0x2b, 0xc0, 0x2f, 0xcc, 0xa9, 0xcc, 0xa8, 0xcc, 0x14, 0xcc, 0x13, 0xc0, 0x0a, 0xc0, 0x14, 0xc0, 0x09, 0xc0, 0x13, 0x00, 0x9c, 0x00, 0x35, 0x00, 0x2f, 0x00, 0x0a})
+		data.Write([]byte{0x1, 0x0})
+
+		ext := tools.BufPool.Get().(*bytes.Buffer)
+		defer tools.BufPool.Put(ext)
+		defer ext.Reset()
+
+		host := c.getHost()
+		ext.Write([]byte{0xff, 0x01, 0x00, 0x01, 0x00})
+		packSNIData(ext, host)
+		ext.Write([]byte{0, 0x17, 0, 0})
+		c.packTicketBuf(ext, host)
+		ext.Write([]byte{0x00, 0x0d, 0x00, 0x16, 0x00, 0x14, 0x06, 0x01, 0x06, 0x03, 0x05, 0x01, 0x05, 0x03, 0x04, 0x01, 0x04, 0x03, 0x03, 0x01, 0x03, 0x03, 0x02, 0x01, 0x02, 0x03})
+		ext.Write([]byte{0x00, 0x05, 0x00, 0x05, 0x01, 0x00, 0x00, 0x00, 0x00})
+		ext.Write([]byte{0x00, 0x12, 0x00, 0x00})
+		ext.Write([]byte{0x75, 0x50, 0x00, 0x00})
+		ext.Write([]byte{0x00, 0x0b, 0x00, 0x02, 0x01, 0x00})
+		ext.Write([]byte{0x00, 0x0a, 0x00, 0x06, 0x00, 0x04, 0x00, 0x17, 0x00, 0x18})
+
+		binary.Write(data, binary.BigEndian, uint16(ext.Len()))
+		data.ReadFrom(ext)
+
+		ret := tools.BufPool.Get().(*bytes.Buffer)
+		defer tools.BufPool.Put(ret)
+		defer ret.Reset()
+
+		ret.Write([]byte{0x16, 3, 1})
+		binary.Write(ret, binary.BigEndian, uint16(data.Len()+4))
+		ret.Write([]byte{1, 0})
+		binary.Write(ret, binary.BigEndian, uint16(data.Len()))
+		ret.ReadFrom(data)
+
+		_, err := c.Conn.Write(ret.Bytes())
+		if err != nil {
+			return 0, err
+		}
+		return length, nil
+	} else if c.handshakeStatus == 1 && len(b) == 0 {
+		buf := tools.BufPool.Get().(*bytes.Buffer)
+		defer tools.BufPool.Put(buf)
+		defer buf.Reset()
+
+		buf.Write([]byte{0x14, 3, 3, 0, 1, 1, 0x16, 3, 3, 0, 0x20})
+		tools.AppendRandBytes(buf, 22)
+		buf.Write(c.hmacSHA1(buf.Bytes())[:10])
+		buf.ReadFrom(&c.sendBuf)
+
+		c.handshakeStatus = 8
+
+		_, err := c.Conn.Write(buf.Bytes())
+		return 0, err
+	}
+	return length, nil
+}
+
+func packData(buf *bytes.Buffer, data []byte) {
+	buf.Write([]byte{0x17, 3, 3})
+	binary.Write(buf, binary.BigEndian, uint16(len(data)))
+	buf.Write(data)
+}
+
+func (t *tls12Ticket) packAuthData(buf *bytes.Buffer) {
+	binary.Write(buf, binary.BigEndian, uint32(time.Now().Unix()))
+	tools.AppendRandBytes(buf, 18)
+	buf.Write(t.hmacSHA1(buf.Bytes()[buf.Len()-22:])[:10])
+}
+
+func packSNIData(buf *bytes.Buffer, u string) {
+	len := uint16(len(u))
+	buf.Write([]byte{0, 0})
+	binary.Write(buf, binary.BigEndian, len+5)
+	binary.Write(buf, binary.BigEndian, len+3)
+	buf.WriteByte(0)
+	binary.Write(buf, binary.BigEndian, len)
+	buf.WriteString(u)
+}
+
+func (c *tls12TicketConn) packTicketBuf(buf *bytes.Buffer, u string) {
+	length := 16 * (rand.Intn(17) + 8)
+	buf.Write([]byte{0, 0x23})
+	binary.Write(buf, binary.BigEndian, uint16(length))
+	tools.AppendRandBytes(buf, length)
+}
+
+func (t *tls12Ticket) hmacSHA1(data []byte) []byte {
+	key := pool.Get(len(t.Key) + 32)
+	defer pool.Put(key)
+	copy(key, t.Key)
+	copy(key[len(t.Key):], t.clientID[:])
+
+	sha1Data := tools.HmacSHA1(key, data)
+	return sha1Data[:10]
+}
+
+func (t *tls12Ticket) getHost() string {
+	host := t.Param
+	if len(host) == 0 {
+		host = t.Host
+	}
+	if len(host) > 0 && host[len(host)-1] >= '0' && host[len(host)-1] <= '9' {
+		host = ""
+	}
+	hosts := strings.Split(host, ",")
+	host = hosts[rand.Intn(len(hosts))]
+	return host
+}

component/ssr/protocol/auth_aes128_md5.go

@@ -0,0 +1,18 @@
+package protocol
+
+import "github.com/Dreamacro/clash/component/ssr/tools"
+
+func init() {
+	register("auth_aes128_md5", newAuthAES128MD5, 9)
+}
+
+func newAuthAES128MD5(b *Base) Protocol {
+	a := &authAES128{
+		Base:               b,
+		authData:           &authData{},
+		authAES128Function: &authAES128Function{salt: "auth_aes128_md5", hmac: tools.HmacMD5, hashDigest: tools.MD5Sum},
+		userData:           &userData{},
+	}
+	a.initUserData()
+	return a
+}

component/ssr/protocol/auth_aes128_sha1.go

@@ -0,0 +1,275 @@
+package protocol
+
+import (
+	"bytes"
+	"encoding/binary"
+	"math"
+	"math/rand"
+	"net"
+	"strconv"
+	"strings"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/component/ssr/tools"
+	"github.com/Dreamacro/clash/log"
+)
+
+type hmacMethod func(key, data []byte) []byte
+type hashDigestMethod func([]byte) []byte
+
+func init() {
+	register("auth_aes128_sha1", newAuthAES128SHA1, 9)
+}
+
+type authAES128Function struct {
+	salt       string
+	hmac       hmacMethod
+	hashDigest hashDigestMethod
+}
+
+type authAES128 struct {
+	*Base
+	*authData
+	*authAES128Function
+	*userData
+	iv            []byte
+	hasSentHeader bool
+	rawTrans      bool
+	packID        uint32
+	recvID        uint32
+}
+
+func newAuthAES128SHA1(b *Base) Protocol {
+	a := &authAES128{
+		Base:               b,
+		authData:           &authData{},
+		authAES128Function: &authAES128Function{salt: "auth_aes128_sha1", hmac: tools.HmacSHA1, hashDigest: tools.SHA1Sum},
+		userData:           &userData{},
+	}
+	a.initUserData()
+	return a
+}
+
+func (a *authAES128) initUserData() {
+	params := strings.Split(a.Param, ":")
+	if len(params) > 1 {
+		if userID, err := strconv.ParseUint(params[0], 10, 32); err == nil {
+			binary.LittleEndian.PutUint32(a.userID[:], uint32(userID))
+			a.userKey = a.hashDigest([]byte(params[1]))
+		} else {
+			log.Warnln("Wrong protocol-param for %s, only digits are expected before ':'", a.salt)
+		}
+	}
+	if len(a.userKey) == 0 {
+		a.userKey = a.Key
+		rand.Read(a.userID[:])
+	}
+}
+
+func (a *authAES128) StreamConn(c net.Conn, iv []byte) net.Conn {
+	p := &authAES128{
+		Base:               a.Base,
+		authData:           a.next(),
+		authAES128Function: a.authAES128Function,
+		userData:           a.userData,
+		packID:             1,
+		recvID:             1,
+	}
+	p.iv = iv
+	return &Conn{Conn: c, Protocol: p}
+}
+
+func (a *authAES128) PacketConn(c net.PacketConn) net.PacketConn {
+	p := &authAES128{
+		Base:               a.Base,
+		authAES128Function: a.authAES128Function,
+		userData:           a.userData,
+	}
+	return &PacketConn{PacketConn: c, Protocol: p}
+}
+
+func (a *authAES128) Decode(dst, src *bytes.Buffer) error {
+	if a.rawTrans {
+		dst.ReadFrom(src)
+		return nil
+	}
+	for src.Len() > 4 {
+		macKey := pool.Get(len(a.userKey) + 4)
+		defer pool.Put(macKey)
+		copy(macKey, a.userKey)
+		binary.LittleEndian.PutUint32(macKey[len(a.userKey):], a.recvID)
+		if !bytes.Equal(a.hmac(macKey, src.Bytes()[:2])[:2], src.Bytes()[2:4]) {
+			src.Reset()
+			return errAuthAES128MACError
+		}
+
+		length := int(binary.LittleEndian.Uint16(src.Bytes()[:2]))
+		if length >= 8192 || length < 7 {
+			a.rawTrans = true
+			src.Reset()
+			return errAuthAES128LengthError
+		}
+		if length > src.Len() {
+			break
+		}
+
+		if !bytes.Equal(a.hmac(macKey, src.Bytes()[:length-4])[:4], src.Bytes()[length-4:length]) {
+			a.rawTrans = true
+			src.Reset()
+			return errAuthAES128ChksumError
+		}
+
+		a.recvID++
+
+		pos := int(src.Bytes()[4])
+		if pos < 255 {
+			pos += 4
+		} else {
+			pos = int(binary.LittleEndian.Uint16(src.Bytes()[5:7])) + 4
+		}
+		dst.Write(src.Bytes()[pos : length-4])
+		src.Next(length)
+	}
+	return nil
+}
+
+func (a *authAES128) Encode(buf *bytes.Buffer, b []byte) error {
+	fullDataLength := len(b)
+	if !a.hasSentHeader {
+		dataLength := getDataLength(b)
+		a.packAuthData(buf, b[:dataLength])
+		b = b[dataLength:]
+		a.hasSentHeader = true
+	}
+	for len(b) > 8100 {
+		a.packData(buf, b[:8100], fullDataLength)
+		b = b[8100:]
+	}
+	if len(b) > 0 {
+		a.packData(buf, b, fullDataLength)
+	}
+	return nil
+}
+
+func (a *authAES128) DecodePacket(b []byte) ([]byte, error) {
+	if !bytes.Equal(a.hmac(a.Key, b[:len(b)-4])[:4], b[len(b)-4:]) {
+		return nil, errAuthAES128ChksumError
+	}
+	return b[:len(b)-4], nil
+}
+
+func (a *authAES128) EncodePacket(buf *bytes.Buffer, b []byte) error {
+	buf.Write(b)
+	buf.Write(a.userID[:])
+	buf.Write(a.hmac(a.userKey, buf.Bytes())[:4])
+	return nil
+}
+
+func (a *authAES128) packData(poolBuf *bytes.Buffer, data []byte, fullDataLength int) {
+	dataLength := len(data)
+	randDataLength := a.getRandDataLengthForPackData(dataLength, fullDataLength)
+	/*
+		2:	uint16 LittleEndian packedDataLength
+		2:	hmac of packedDataLength
+		3:	maxRandDataLengthPrefix (min:1)
+		4:	hmac of packedData except the last 4 bytes
+	*/
+	packedDataLength := 2 + 2 + 3 + randDataLength + dataLength + 4
+	if randDataLength < 128 {
+		packedDataLength -= 2
+	}
+
+	macKey := pool.Get(len(a.userKey) + 4)
+	defer pool.Put(macKey)
+	copy(macKey, a.userKey)
+	binary.LittleEndian.PutUint32(macKey[len(a.userKey):], a.packID)
+	a.packID++
+
+	binary.Write(poolBuf, binary.LittleEndian, uint16(packedDataLength))
+	poolBuf.Write(a.hmac(macKey, poolBuf.Bytes()[poolBuf.Len()-2:])[:2])
+	a.packRandData(poolBuf, randDataLength)
+	poolBuf.Write(data)
+	poolBuf.Write(a.hmac(macKey, poolBuf.Bytes()[poolBuf.Len()-packedDataLength+4:])[:4])
+}
+
+func trapezoidRandom(max int, d float64) int {
+	base := rand.Float64()
+	if d-0 > 1e-6 {
+		a := 1 - d
+		base = (math.Sqrt(a*a+4*d*base) - a) / (2 * d)
+	}
+	return int(base * float64(max))
+}
+
+func (a *authAES128) getRandDataLengthForPackData(dataLength, fullDataLength int) int {
+	if fullDataLength >= 32*1024-a.Overhead {
+		return 0
+	}
+	// 1460: tcp_mss
+	revLength := 1460 - dataLength - 9
+	if revLength == 0 {
+		return 0
+	}
+	if revLength < 0 {
+		if revLength > -1460 {
+			return trapezoidRandom(revLength+1460, -0.3)
+		}
+		return rand.Intn(32)
+	}
+	if dataLength > 900 {
+		return rand.Intn(revLength)
+	}
+	return trapezoidRandom(revLength, -0.3)
+}
+
+func (a *authAES128) packAuthData(poolBuf *bytes.Buffer, data []byte) {
+	if len(data) == 0 {
+		return
+	}
+	dataLength := len(data)
+	randDataLength := a.getRandDataLengthForPackAuthData(dataLength)
+	/*
+		7:	checkHead(1) and hmac of checkHead(6)
+		4:	userID
+		16:	encrypted data of authdata(12), uint16 BigEndian packedDataLength(2) and uint16 BigEndian randDataLength(2)
+		4:	hmac of userID and encrypted data
+		4:	hmac of packedAuthData except the last 4 bytes
+	*/
+	packedAuthDataLength := 7 + 4 + 16 + 4 + randDataLength + dataLength + 4
+
+	macKey := pool.Get(len(a.iv) + len(a.Key))
+	defer pool.Put(macKey)
+	copy(macKey, a.iv)
+	copy(macKey[len(a.iv):], a.Key)
+
+	poolBuf.WriteByte(byte(rand.Intn(256)))
+	poolBuf.Write(a.hmac(macKey, poolBuf.Bytes())[:6])
+	poolBuf.Write(a.userID[:])
+	err := a.authData.putEncryptedData(poolBuf, a.userKey, [2]int{packedAuthDataLength, randDataLength}, a.salt)
+	if err != nil {
+		poolBuf.Reset()
+		return
+	}
+	poolBuf.Write(a.hmac(macKey, poolBuf.Bytes()[7:])[:4])
+	tools.AppendRandBytes(poolBuf, randDataLength)
+	poolBuf.Write(data)
+	poolBuf.Write(a.hmac(a.userKey, poolBuf.Bytes())[:4])
+}
+
+func (a *authAES128) getRandDataLengthForPackAuthData(size int) int {
+	if size > 400 {
+		return rand.Intn(512)
+	}
+	return rand.Intn(1024)
+}
+
+func (a *authAES128) packRandData(poolBuf *bytes.Buffer, size int) {
+	if size < 128 {
+		poolBuf.WriteByte(byte(size + 1))
+		tools.AppendRandBytes(poolBuf, size)
+		return
+	}
+	poolBuf.WriteByte(255)
+	binary.Write(poolBuf, binary.LittleEndian, uint16(size+3))
+	tools.AppendRandBytes(poolBuf, size)
+}

component/ssr/protocol/auth_chain_a.go

@@ -0,0 +1,309 @@
+package protocol
+
+import (
+	"bytes"
+	"crypto/cipher"
+	"crypto/rand"
+	"crypto/rc4"
+	"encoding/base64"
+	"encoding/binary"
+	"net"
+	"strconv"
+	"strings"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/component/ssr/tools"
+	"github.com/Dreamacro/clash/log"
+	"github.com/Dreamacro/go-shadowsocks2/core"
+)
+
+func init() {
+	register("auth_chain_a", newAuthChainA, 4)
+}
+
+type randDataLengthMethod func(int, []byte, *tools.XorShift128Plus) int
+
+type authChainA struct {
+	*Base
+	*authData
+	*userData
+	iv             []byte
+	salt           string
+	hasSentHeader  bool
+	rawTrans       bool
+	lastClientHash []byte
+	lastServerHash []byte
+	encrypter      cipher.Stream
+	decrypter      cipher.Stream
+	randomClient   tools.XorShift128Plus
+	randomServer   tools.XorShift128Plus
+	randDataLength randDataLengthMethod
+	packID         uint32
+	recvID         uint32
+}
+
+func newAuthChainA(b *Base) Protocol {
+	a := &authChainA{
+		Base:     b,
+		authData: &authData{},
+		userData: &userData{},
+		salt:     "auth_chain_a",
+	}
+	a.initUserData()
+	return a
+}
+
+func (a *authChainA) initUserData() {
+	params := strings.Split(a.Param, ":")
+	if len(params) > 1 {
+		if userID, err := strconv.ParseUint(params[0], 10, 32); err == nil {
+			binary.LittleEndian.PutUint32(a.userID[:], uint32(userID))
+			a.userKey = []byte(params[1])
+		} else {
+			log.Warnln("Wrong protocol-param for %s, only digits are expected before ':'", a.salt)
+		}
+	}
+	if len(a.userKey) == 0 {
+		a.userKey = a.Key
+		rand.Read(a.userID[:])
+	}
+}
+
+func (a *authChainA) StreamConn(c net.Conn, iv []byte) net.Conn {
+	p := &authChainA{
+		Base:     a.Base,
+		authData: a.next(),
+		userData: a.userData,
+		salt:     a.salt,
+		packID:   1,
+		recvID:   1,
+	}
+	p.iv = iv
+	p.randDataLength = p.getRandLength
+	return &Conn{Conn: c, Protocol: p}
+}
+
+func (a *authChainA) PacketConn(c net.PacketConn) net.PacketConn {
+	p := &authChainA{
+		Base:     a.Base,
+		salt:     a.salt,
+		userData: a.userData,
+	}
+	return &PacketConn{PacketConn: c, Protocol: p}
+}
+
+func (a *authChainA) Decode(dst, src *bytes.Buffer) error {
+	if a.rawTrans {
+		dst.ReadFrom(src)
+		return nil
+	}
+	for src.Len() > 4 {
+		macKey := pool.Get(len(a.userKey) + 4)
+		defer pool.Put(macKey)
+		copy(macKey, a.userKey)
+		binary.LittleEndian.PutUint32(macKey[len(a.userKey):], a.recvID)
+
+		dataLength := int(binary.LittleEndian.Uint16(src.Bytes()[:2]) ^ binary.LittleEndian.Uint16(a.lastServerHash[14:16]))
+		randDataLength := a.randDataLength(dataLength, a.lastServerHash, &a.randomServer)
+		length := dataLength + randDataLength
+
+		if length >= 4096 {
+			a.rawTrans = true
+			src.Reset()
+			return errAuthChainLengthError
+		}
+
+		if 4+length > src.Len() {
+			break
+		}
+
+		serverHash := tools.HmacMD5(macKey, src.Bytes()[:length+2])
+		if !bytes.Equal(serverHash[:2], src.Bytes()[length+2:length+4]) {
+			a.rawTrans = true
+			src.Reset()
+			return errAuthChainChksumError
+		}
+		a.lastServerHash = serverHash
+
+		pos := 2
+		if dataLength > 0 && randDataLength > 0 {
+			pos += getRandStartPos(randDataLength, &a.randomServer)
+		}
+		wantedData := src.Bytes()[pos : pos+dataLength]
+		a.decrypter.XORKeyStream(wantedData, wantedData)
+		if a.recvID == 1 {
+			dst.Write(wantedData[2:])
+		} else {
+			dst.Write(wantedData)
+		}
+		a.recvID++
+		src.Next(length + 4)
+	}
+	return nil
+}
+
+func (a *authChainA) Encode(buf *bytes.Buffer, b []byte) error {
+	if !a.hasSentHeader {
+		dataLength := getDataLength(b)
+		a.packAuthData(buf, b[:dataLength])
+		b = b[dataLength:]
+		a.hasSentHeader = true
+	}
+	for len(b) > 2800 {
+		a.packData(buf, b[:2800])
+		b = b[2800:]
+	}
+	if len(b) > 0 {
+		a.packData(buf, b)
+	}
+	return nil
+}
+
+func (a *authChainA) DecodePacket(b []byte) ([]byte, error) {
+	if len(b) < 9 {
+		return nil, errAuthChainLengthError
+	}
+	if !bytes.Equal(tools.HmacMD5(a.userKey, b[:len(b)-1])[:1], b[len(b)-1:]) {
+		return nil, errAuthChainChksumError
+	}
+	md5Data := tools.HmacMD5(a.Key, b[len(b)-8:len(b)-1])
+
+	randDataLength := udpGetRandLength(md5Data, &a.randomServer)
+
+	key := core.Kdf(base64.StdEncoding.EncodeToString(a.userKey)+base64.StdEncoding.EncodeToString(md5Data), 16)
+	rc4Cipher, err := rc4.NewCipher(key)
+	if err != nil {
+		return nil, err
+	}
+	wantedData := b[:len(b)-8-randDataLength]
+	rc4Cipher.XORKeyStream(wantedData, wantedData)
+	return wantedData, nil
+}
+
+func (a *authChainA) EncodePacket(buf *bytes.Buffer, b []byte) error {
+	authData := pool.Get(3)
+	defer pool.Put(authData)
+	rand.Read(authData)
+
+	md5Data := tools.HmacMD5(a.Key, authData)
+
+	randDataLength := udpGetRandLength(md5Data, &a.randomClient)
+
+	key := core.Kdf(base64.StdEncoding.EncodeToString(a.userKey)+base64.StdEncoding.EncodeToString(md5Data), 16)
+	rc4Cipher, err := rc4.NewCipher(key)
+	if err != nil {
+		return err
+	}
+	rc4Cipher.XORKeyStream(b, b)
+
+	buf.Write(b)
+	tools.AppendRandBytes(buf, randDataLength)
+	buf.Write(authData)
+	binary.Write(buf, binary.LittleEndian, binary.LittleEndian.Uint32(a.userID[:])^binary.LittleEndian.Uint32(md5Data[:4]))
+	buf.Write(tools.HmacMD5(a.userKey, buf.Bytes())[:1])
+	return nil
+}
+
+func (a *authChainA) packAuthData(poolBuf *bytes.Buffer, data []byte) {
+	/*
+		dataLength := len(data)
+		12:	checkHead(4) and hmac of checkHead(8)
+		4:	uint32 LittleEndian uid (uid = userID ^ last client hash)
+		16:	encrypted data of authdata(12), uint16 LittleEndian overhead(2) and uint16 LittleEndian number zero(2)
+		4:	last server hash(4)
+		packedAuthDataLength := 12 + 4 + 16 + 4 + dataLength
+	*/
+
+	macKey := pool.Get(len(a.iv) + len(a.Key))
+	defer pool.Put(macKey)
+	copy(macKey, a.iv)
+	copy(macKey[len(a.iv):], a.Key)
+
+	// check head
+	tools.AppendRandBytes(poolBuf, 4)
+	a.lastClientHash = tools.HmacMD5(macKey, poolBuf.Bytes())
+	a.initRC4Cipher()
+	poolBuf.Write(a.lastClientHash[:8])
+	// uid
+	binary.Write(poolBuf, binary.LittleEndian, binary.LittleEndian.Uint32(a.userID[:])^binary.LittleEndian.Uint32(a.lastClientHash[8:12]))
+	// encrypted data
+	err := a.putEncryptedData(poolBuf, a.userKey, [2]int{a.Overhead, 0}, a.salt)
+	if err != nil {
+		poolBuf.Reset()
+		return
+	}
+	// last server hash
+	a.lastServerHash = tools.HmacMD5(a.userKey, poolBuf.Bytes()[12:])
+	poolBuf.Write(a.lastServerHash[:4])
+	// packed data
+	a.packData(poolBuf, data)
+}
+
+func (a *authChainA) packData(poolBuf *bytes.Buffer, data []byte) {
+	a.encrypter.XORKeyStream(data, data)
+
+	macKey := pool.Get(len(a.userKey) + 4)
+	defer pool.Put(macKey)
+	copy(macKey, a.userKey)
+	binary.LittleEndian.PutUint32(macKey[len(a.userKey):], a.packID)
+	a.packID++
+
+	length := uint16(len(data)) ^ binary.LittleEndian.Uint16(a.lastClientHash[14:16])
+
+	originalLength := poolBuf.Len()
+	binary.Write(poolBuf, binary.LittleEndian, length)
+	a.putMixedRandDataAndData(poolBuf, data)
+	a.lastClientHash = tools.HmacMD5(macKey, poolBuf.Bytes()[originalLength:])
+	poolBuf.Write(a.lastClientHash[:2])
+}
+
+func (a *authChainA) putMixedRandDataAndData(poolBuf *bytes.Buffer, data []byte) {
+	randDataLength := a.randDataLength(len(data), a.lastClientHash, &a.randomClient)
+	if len(data) == 0 {
+		tools.AppendRandBytes(poolBuf, randDataLength)
+		return
+	}
+	if randDataLength > 0 {
+		startPos := getRandStartPos(randDataLength, &a.randomClient)
+		tools.AppendRandBytes(poolBuf, startPos)
+		poolBuf.Write(data)
+		tools.AppendRandBytes(poolBuf, randDataLength-startPos)
+		return
+	}
+	poolBuf.Write(data)
+}
+
+func getRandStartPos(length int, random *tools.XorShift128Plus) int {
+	if length == 0 {
+		return 0
+	}
+	return int(random.Next()%8589934609) % length
+}
+
+func (a *authChainA) getRandLength(length int, lastHash []byte, random *tools.XorShift128Plus) int {
+	if length > 1440 {
+		return 0
+	}
+	random.InitFromBinAndLength(lastHash, length)
+	if length > 1300 {
+		return int(random.Next() % 31)
+	}
+	if length > 900 {
+		return int(random.Next() % 127)
+	}
+	if length > 400 {
+		return int(random.Next() % 521)
+	}
+	return int(random.Next() % 1021)
+}
+
+func (a *authChainA) initRC4Cipher() {
+	key := core.Kdf(base64.StdEncoding.EncodeToString(a.userKey)+base64.StdEncoding.EncodeToString(a.lastClientHash), 16)
+	a.encrypter, _ = rc4.NewCipher(key)
+	a.decrypter, _ = rc4.NewCipher(key)
+}
+
+func udpGetRandLength(lastHash []byte, random *tools.XorShift128Plus) int {
+	random.InitFromBin(lastHash)
+	return int(random.Next() % 127)
+}

component/ssr/protocol/auth_chain_b.go

@@ -0,0 +1,97 @@
+package protocol
+
+import (
+	"net"
+	"sort"
+
+	"github.com/Dreamacro/clash/component/ssr/tools"
+)
+
+func init() {
+	register("auth_chain_b", newAuthChainB, 4)
+}
+
+type authChainB struct {
+	*authChainA
+	dataSizeList  []int
+	dataSizeList2 []int
+}
+
+func newAuthChainB(b *Base) Protocol {
+	a := &authChainB{
+		authChainA: &authChainA{
+			Base:     b,
+			authData: &authData{},
+			userData: &userData{},
+			salt:     "auth_chain_b",
+		},
+	}
+	a.initUserData()
+	return a
+}
+
+func (a *authChainB) StreamConn(c net.Conn, iv []byte) net.Conn {
+	p := &authChainB{
+		authChainA: &authChainA{
+			Base:     a.Base,
+			authData: a.next(),
+			userData: a.userData,
+			salt:     a.salt,
+			packID:   1,
+			recvID:   1,
+		},
+	}
+	p.iv = iv
+	p.randDataLength = p.getRandLength
+	p.initDataSize()
+	return &Conn{Conn: c, Protocol: p}
+}
+
+func (a *authChainB) initDataSize() {
+	a.dataSizeList = a.dataSizeList[:0]
+	a.dataSizeList2 = a.dataSizeList2[:0]
+
+	a.randomServer.InitFromBin(a.Key)
+	length := a.randomServer.Next()%8 + 4
+	for ; length > 0; length-- {
+		a.dataSizeList = append(a.dataSizeList, int(a.randomServer.Next()%2340%2040%1440))
+	}
+	sort.Ints(a.dataSizeList)
+
+	length = a.randomServer.Next()%16 + 8
+	for ; length > 0; length-- {
+		a.dataSizeList2 = append(a.dataSizeList2, int(a.randomServer.Next()%2340%2040%1440))
+	}
+	sort.Ints(a.dataSizeList2)
+}
+
+func (a *authChainB) getRandLength(length int, lashHash []byte, random *tools.XorShift128Plus) int {
+	if length >= 1440 {
+		return 0
+	}
+	random.InitFromBinAndLength(lashHash, length)
+	pos := sort.Search(len(a.dataSizeList), func(i int) bool { return a.dataSizeList[i] >= length+a.Overhead })
+	finalPos := pos + int(random.Next()%uint64(len(a.dataSizeList)))
+	if finalPos < len(a.dataSizeList) {
+		return a.dataSizeList[finalPos] - length - a.Overhead
+	}
+
+	pos = sort.Search(len(a.dataSizeList2), func(i int) bool { return a.dataSizeList2[i] >= length+a.Overhead })
+	finalPos = pos + int(random.Next()%uint64(len(a.dataSizeList2)))
+	if finalPos < len(a.dataSizeList2) {
+		return a.dataSizeList2[finalPos] - length - a.Overhead
+	}
+	if finalPos < pos+len(a.dataSizeList2)-1 {
+		return 0
+	}
+	if length > 1300 {
+		return int(random.Next() % 31)
+	}
+	if length > 900 {
+		return int(random.Next() % 127)
+	}
+	if length > 400 {
+		return int(random.Next() % 521)
+	}
+	return int(random.Next() % 1021)
+}

component/ssr/protocol/auth_sha1_v4.go

@@ -0,0 +1,182 @@
+package protocol
+
+import (
+	"bytes"
+	"encoding/binary"
+	"hash/adler32"
+	"hash/crc32"
+	"math/rand"
+	"net"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/component/ssr/tools"
+)
+
+func init() {
+	register("auth_sha1_v4", newAuthSHA1V4, 7)
+}
+
+type authSHA1V4 struct {
+	*Base
+	*authData
+	iv            []byte
+	hasSentHeader bool
+	rawTrans      bool
+}
+
+func newAuthSHA1V4(b *Base) Protocol {
+	return &authSHA1V4{Base: b, authData: &authData{}}
+}
+
+func (a *authSHA1V4) StreamConn(c net.Conn, iv []byte) net.Conn {
+	p := &authSHA1V4{Base: a.Base, authData: a.next()}
+	p.iv = iv
+	return &Conn{Conn: c, Protocol: p}
+}
+
+func (a *authSHA1V4) PacketConn(c net.PacketConn) net.PacketConn {
+	return c
+}
+
+func (a *authSHA1V4) Decode(dst, src *bytes.Buffer) error {
+	if a.rawTrans {
+		dst.ReadFrom(src)
+		return nil
+	}
+	for src.Len() > 4 {
+		if uint16(crc32.ChecksumIEEE(src.Bytes()[:2])&0xffff) != binary.LittleEndian.Uint16(src.Bytes()[2:4]) {
+			src.Reset()
+			return errAuthSHA1V4CRC32Error
+		}
+
+		length := int(binary.BigEndian.Uint16(src.Bytes()[:2]))
+		if length >= 8192 || length < 7 {
+			a.rawTrans = true
+			src.Reset()
+			return errAuthSHA1V4LengthError
+		}
+		if length > src.Len() {
+			break
+		}
+
+		if adler32.Checksum(src.Bytes()[:length-4]) != binary.LittleEndian.Uint32(src.Bytes()[length-4:length]) {
+			a.rawTrans = true
+			src.Reset()
+			return errAuthSHA1V4Adler32Error
+		}
+
+		pos := int(src.Bytes()[4])
+		if pos < 255 {
+			pos += 4
+		} else {
+			pos = int(binary.BigEndian.Uint16(src.Bytes()[5:7])) + 4
+		}
+		dst.Write(src.Bytes()[pos : length-4])
+		src.Next(length)
+	}
+	return nil
+}
+
+func (a *authSHA1V4) Encode(buf *bytes.Buffer, b []byte) error {
+	if !a.hasSentHeader {
+		dataLength := getDataLength(b)
+
+		a.packAuthData(buf, b[:dataLength])
+		b = b[dataLength:]
+
+		a.hasSentHeader = true
+	}
+	for len(b) > 8100 {
+		a.packData(buf, b[:8100])
+		b = b[8100:]
+	}
+	if len(b) > 0 {
+		a.packData(buf, b)
+	}
+
+	return nil
+}
+
+func (a *authSHA1V4) DecodePacket(b []byte) ([]byte, error) { return b, nil }
+
+func (a *authSHA1V4) EncodePacket(buf *bytes.Buffer, b []byte) error {
+	buf.Write(b)
+	return nil
+}
+
+func (a *authSHA1V4) packData(poolBuf *bytes.Buffer, data []byte) {
+	dataLength := len(data)
+	randDataLength := a.getRandDataLength(dataLength)
+	/*
+		2:	uint16 BigEndian packedDataLength
+		2:	uint16 LittleEndian crc32Data & 0xffff
+		3:	maxRandDataLengthPrefix (min:1)
+		4:	adler32Data
+	*/
+	packedDataLength := 2 + 2 + 3 + randDataLength + dataLength + 4
+	if randDataLength < 128 {
+		packedDataLength -= 2
+	}
+
+	binary.Write(poolBuf, binary.BigEndian, uint16(packedDataLength))
+	binary.Write(poolBuf, binary.LittleEndian, uint16(crc32.ChecksumIEEE(poolBuf.Bytes()[poolBuf.Len()-2:])&0xffff))
+	a.packRandData(poolBuf, randDataLength)
+	poolBuf.Write(data)
+	binary.Write(poolBuf, binary.LittleEndian, adler32.Checksum(poolBuf.Bytes()[poolBuf.Len()-packedDataLength+4:]))
+}
+
+func (a *authSHA1V4) packAuthData(poolBuf *bytes.Buffer, data []byte) {
+	dataLength := len(data)
+	randDataLength := a.getRandDataLength(12 + dataLength)
+	/*
+		2:	uint16 BigEndian packedAuthDataLength
+		4:	uint32 LittleEndian crc32Data
+		3:	maxRandDataLengthPrefix (min: 1)
+		12:	authDataLength
+		10:	hmacSHA1DataLength
+	*/
+	packedAuthDataLength := 2 + 4 + 3 + randDataLength + 12 + dataLength + 10
+	if randDataLength < 128 {
+		packedAuthDataLength -= 2
+	}
+
+	salt := []byte("auth_sha1_v4")
+	crcData := pool.Get(len(salt) + len(a.Key) + 2)
+	defer pool.Put(crcData)
+	binary.BigEndian.PutUint16(crcData, uint16(packedAuthDataLength))
+	copy(crcData[2:], salt)
+	copy(crcData[2+len(salt):], a.Key)
+
+	key := pool.Get(len(a.iv) + len(a.Key))
+	defer pool.Put(key)
+	copy(key, a.iv)
+	copy(key[len(a.iv):], a.Key)
+
+	poolBuf.Write(crcData[:2])
+	binary.Write(poolBuf, binary.LittleEndian, crc32.ChecksumIEEE(crcData))
+	a.packRandData(poolBuf, randDataLength)
+	a.putAuthData(poolBuf)
+	poolBuf.Write(data)
+	poolBuf.Write(tools.HmacSHA1(key, poolBuf.Bytes()[poolBuf.Len()-packedAuthDataLength+10:])[:10])
+}
+
+func (a *authSHA1V4) packRandData(poolBuf *bytes.Buffer, size int) {
+	if size < 128 {
+		poolBuf.WriteByte(byte(size + 1))
+		tools.AppendRandBytes(poolBuf, size)
+		return
+	}
+	poolBuf.WriteByte(255)
+	binary.Write(poolBuf, binary.BigEndian, uint16(size+3))
+	tools.AppendRandBytes(poolBuf, size)
+}
+
+func (a *authSHA1V4) getRandDataLength(size int) int {
+	if size > 1200 {
+		return 0
+	}
+	if size > 400 {
+		return rand.Intn(256)
+	}
+	return rand.Intn(512)
+}

component/ssr/protocol/base.go

@@ -0,0 +1,77 @@
+package protocol
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"encoding/base64"
+	"encoding/binary"
+	"math/rand"
+	"sync"
+	"time"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/log"
+	"github.com/Dreamacro/go-shadowsocks2/core"
+)
+
+type Base struct {
+	Key      []byte
+	Overhead int
+	Param    string
+}
+
+type userData struct {
+	userKey []byte
+	userID  [4]byte
+}
+
+type authData struct {
+	clientID     [4]byte
+	connectionID uint32
+	mutex        sync.Mutex
+}
+
+func (a *authData) next() *authData {
+	r := &authData{}
+	a.mutex.Lock()
+	defer a.mutex.Unlock()
+	if a.connectionID > 0xff000000 || a.connectionID == 0 {
+		rand.Read(a.clientID[:])
+		a.connectionID = rand.Uint32() & 0xffffff
+	}
+	a.connectionID++
+	copy(r.clientID[:], a.clientID[:])
+	r.connectionID = a.connectionID
+	return r
+}
+
+func (a *authData) putAuthData(buf *bytes.Buffer) {
+	binary.Write(buf, binary.LittleEndian, uint32(time.Now().Unix()))
+	buf.Write(a.clientID[:])
+	binary.Write(buf, binary.LittleEndian, a.connectionID)
+}
+
+func (a *authData) putEncryptedData(b *bytes.Buffer, userKey []byte, paddings [2]int, salt string) error {
+	encrypt := pool.Get(16)
+	defer pool.Put(encrypt)
+	binary.LittleEndian.PutUint32(encrypt, uint32(time.Now().Unix()))
+	copy(encrypt[4:], a.clientID[:])
+	binary.LittleEndian.PutUint32(encrypt[8:], a.connectionID)
+	binary.LittleEndian.PutUint16(encrypt[12:], uint16(paddings[0]))
+	binary.LittleEndian.PutUint16(encrypt[14:], uint16(paddings[1]))
+
+	cipherKey := core.Kdf(base64.StdEncoding.EncodeToString(userKey)+salt, 16)
+	block, err := aes.NewCipher(cipherKey)
+	if err != nil {
+		log.Warnln("New cipher error: %s", err.Error())
+		return err
+	}
+	iv := bytes.Repeat([]byte{0}, 16)
+	cbcCipher := cipher.NewCBCEncrypter(block, iv)
+
+	cbcCipher.CryptBlocks(encrypt, encrypt)
+
+	b.Write(encrypt)
+	return nil
+}

component/ssr/protocol/origin.go

@@ -0,0 +1,33 @@
+package protocol
+
+import (
+	"bytes"
+	"net"
+)
+
+type origin struct{}
+
+func init() { register("origin", newOrigin, 0) }
+
+func newOrigin(b *Base) Protocol { return &origin{} }
+
+func (o *origin) StreamConn(c net.Conn, iv []byte) net.Conn { return c }
+
+func (o *origin) PacketConn(c net.PacketConn) net.PacketConn { return c }
+
+func (o *origin) Decode(dst, src *bytes.Buffer) error {
+	dst.ReadFrom(src)
+	return nil
+}
+
+func (o *origin) Encode(buf *bytes.Buffer, b []byte) error {
+	buf.Write(b)
+	return nil
+}
+
+func (o *origin) DecodePacket(b []byte) ([]byte, error) { return b, nil }
+
+func (o *origin) EncodePacket(buf *bytes.Buffer, b []byte) error {
+	buf.Write(b)
+	return nil
+}

component/ssr/protocol/packet.go

@@ -0,0 +1,38 @@
+package protocol
+
+import (
+	"bytes"
+	"net"
+
+	"github.com/Dreamacro/clash/component/ssr/tools"
+)
+
+type PacketConn struct {
+	net.PacketConn
+	Protocol
+}
+
+func (c *PacketConn) WriteTo(b []byte, addr net.Addr) (int, error) {
+	buf := tools.BufPool.Get().(*bytes.Buffer)
+	defer tools.BufPool.Put(buf)
+	defer buf.Reset()
+	err := c.EncodePacket(buf, b)
+	if err != nil {
+		return 0, err
+	}
+	_, err = c.PacketConn.WriteTo(buf.Bytes(), addr)
+	return len(b), err
+}
+
+func (c *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, addr, err := c.PacketConn.ReadFrom(b)
+	if err != nil {
+		return n, addr, err
+	}
+	decoded, err := c.DecodePacket(b[:n])
+	if err != nil {
+		return n, addr, err
+	}
+	copy(b, decoded)
+	return len(decoded), addr, nil
+}

component/ssr/protocol/protocol.go

@@ -0,0 +1,76 @@
+package protocol
+
+import (
+	"bytes"
+	"errors"
+	"fmt"
+	"math/rand"
+	"net"
+)
+
+var (
+	errAuthSHA1V4CRC32Error   = errors.New("auth_sha1_v4 decode data wrong crc32")
+	errAuthSHA1V4LengthError  = errors.New("auth_sha1_v4 decode data wrong length")
+	errAuthSHA1V4Adler32Error = errors.New("auth_sha1_v4 decode data wrong adler32")
+	errAuthAES128MACError     = errors.New("auth_aes128 decode data wrong mac")
+	errAuthAES128LengthError  = errors.New("auth_aes128 decode data wrong length")
+	errAuthAES128ChksumError  = errors.New("auth_aes128 decode data wrong checksum")
+	errAuthChainLengthError   = errors.New("auth_chain decode data wrong length")
+	errAuthChainChksumError   = errors.New("auth_chain decode data wrong checksum")
+)
+
+type Protocol interface {
+	StreamConn(net.Conn, []byte) net.Conn
+	PacketConn(net.PacketConn) net.PacketConn
+	Decode(dst, src *bytes.Buffer) error
+	Encode(buf *bytes.Buffer, b []byte) error
+	DecodePacket([]byte) ([]byte, error)
+	EncodePacket(buf *bytes.Buffer, b []byte) error
+}
+
+type protocolCreator func(b *Base) Protocol
+
+var protocolList = make(map[string]struct {
+	overhead int
+	new      protocolCreator
+})
+
+func register(name string, c protocolCreator, o int) {
+	protocolList[name] = struct {
+		overhead int
+		new      protocolCreator
+	}{overhead: o, new: c}
+}
+
+func PickProtocol(name string, b *Base) (Protocol, error) {
+	if choice, ok := protocolList[name]; ok {
+		b.Overhead += choice.overhead
+		return choice.new(b), nil
+	}
+	return nil, fmt.Errorf("protocol %s not supported", name)
+}
+
+func getHeadSize(b []byte, defaultValue int) int {
+	if len(b) < 2 {
+		return defaultValue
+	}
+	headType := b[0] & 7
+	switch headType {
+	case 1:
+		return 7
+	case 4:
+		return 19
+	case 3:
+		return 4 + int(b[1])
+	}
+	return defaultValue
+}
+
+func getDataLength(b []byte) int {
+	bLength := len(b)
+	dataLength := getHeadSize(b, 30) + rand.Intn(32)
+	if bLength < dataLength {
+		return bLength
+	}
+	return dataLength
+}

component/ssr/protocol/stream.go

@@ -0,0 +1,52 @@
+package protocol
+
+import (
+	"bytes"
+	"net"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/component/ssr/tools"
+)
+
+type Conn struct {
+	net.Conn
+	Protocol
+	decoded      bytes.Buffer
+	underDecoded bytes.Buffer
+}
+
+func (c *Conn) Read(b []byte) (int, error) {
+	if c.decoded.Len() > 0 {
+		return c.decoded.Read(b)
+	}
+
+	buf := pool.Get(pool.RelayBufferSize)
+	defer pool.Put(buf)
+	n, err := c.Conn.Read(buf)
+	if err != nil {
+		return 0, err
+	}
+	c.underDecoded.Write(buf[:n])
+	err = c.Decode(&c.decoded, &c.underDecoded)
+	if err != nil {
+		return 0, err
+	}
+	n, _ = c.decoded.Read(b)
+	return n, nil
+}
+
+func (c *Conn) Write(b []byte) (int, error) {
+	bLength := len(b)
+	buf := tools.BufPool.Get().(*bytes.Buffer)
+	defer tools.BufPool.Put(buf)
+	defer buf.Reset()
+	err := c.Encode(buf, b)
+	if err != nil {
+		return 0, err
+	}
+	_, err = c.Conn.Write(buf.Bytes())
+	if err != nil {
+		return 0, err
+	}
+	return bLength, nil
+}

component/ssr/tools/bufPool.go

@@ -0,0 +1,18 @@
+package tools
+
+import (
+	"bytes"
+	"math/rand"
+	"sync"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+var BufPool = sync.Pool{New: func() interface{} { return &bytes.Buffer{} }}
+
+func AppendRandBytes(b *bytes.Buffer, length int) {
+	randBytes := pool.Get(length)
+	defer pool.Put(randBytes)
+	rand.Read(randBytes)
+	b.Write(randBytes)
+}

component/ssr/tools/crypto.go

@@ -0,0 +1,33 @@
+package tools
+
+import (
+	"crypto/hmac"
+	"crypto/md5"
+	"crypto/sha1"
+)
+
+const HmacSHA1Len = 10
+
+func HmacMD5(key, data []byte) []byte {
+	hmacMD5 := hmac.New(md5.New, key)
+	hmacMD5.Write(data)
+	return hmacMD5.Sum(nil)
+}
+
+func HmacSHA1(key, data []byte) []byte {
+	hmacSHA1 := hmac.New(sha1.New, key)
+	hmacSHA1.Write(data)
+	return hmacSHA1.Sum(nil)
+}
+
+func MD5Sum(b []byte) []byte {
+	h := md5.New()
+	h.Write(b)
+	return h.Sum(nil)
+}
+
+func SHA1Sum(b []byte) []byte {
+	h := sha1.New()
+	h.Write(b)
+	return h.Sum(nil)
+}

component/ssr/tools/random.go

@@ -0,0 +1,57 @@
+package tools
+
+import (
+	"encoding/binary"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+// XorShift128Plus - a pseudorandom number generator
+type XorShift128Plus struct {
+	s [2]uint64
+}
+
+func (r *XorShift128Plus) Next() uint64 {
+	x := r.s[0]
+	y := r.s[1]
+	r.s[0] = y
+	x ^= x << 23
+	x ^= y ^ (x >> 17) ^ (y >> 26)
+	r.s[1] = x
+	return x + y
+}
+
+func (r *XorShift128Plus) InitFromBin(bin []byte) {
+	var full []byte
+	if len(bin) < 16 {
+		full := pool.Get(16)[:0]
+		defer pool.Put(full)
+		full = append(full, bin...)
+		for len(full) < 16 {
+			full = append(full, 0)
+		}
+	} else {
+		full = bin
+	}
+	r.s[0] = binary.LittleEndian.Uint64(full[:8])
+	r.s[1] = binary.LittleEndian.Uint64(full[8:16])
+}
+
+func (r *XorShift128Plus) InitFromBinAndLength(bin []byte, length int) {
+	var full []byte
+	if len(bin) < 16 {
+		full := pool.Get(16)[:0]
+		defer pool.Put(full)
+		full = append(full, bin...)
+		for len(full) < 16 {
+			full = append(full, 0)
+		}
+	}
+	full = bin
+	binary.LittleEndian.PutUint16(full, uint16(length))
+	r.s[0] = binary.LittleEndian.Uint64(full[:8])
+	r.s[1] = binary.LittleEndian.Uint64(full[8:16])
+	for i := 0; i < 4; i++ {
+		r.Next()
+	}
+}

component/vmess/aead.go

@@ -86,7 +86,7 @@ func (r *aeadReader) Read(b []byte) (int, error) {
 
 	size := int(binary.BigEndian.Uint16(r.sizeBuf))
 	if size > maxSize {
-		return 0, errors.New("Buffer is larger than standard")
+		return 0, errors.New("buffer is larger than standard")
 	}
 
 	buf := pool.Get(size)

component/vmess/chunk.go

@@ -47,7 +47,7 @@ func (cr *chunkReader) Read(b []byte) (int, error) {
 
 	size := int(binary.BigEndian.Uint16(cr.sizeBuf))
 	if size > maxSize {
-		return 0, errors.New("Buffer is larger than standard")
+		return 0, errors.New("buffer is larger than standard")
 	}
 
 	if len(b) >= size {

component/vmess/h2.go

@@ -0,0 +1,112 @@
+package vmess
+
+import (
+	"io"
+	"math/rand"
+	"net"
+	"net/http"
+	"net/url"
+
+	"golang.org/x/net/http2"
+)
+
+type h2Conn struct {
+	net.Conn
+	*http2.ClientConn
+	pwriter *io.PipeWriter
+	res     *http.Response
+	cfg     *H2Config
+}
+
+type H2Config struct {
+	Hosts []string
+	Path  string
+}
+
+func (hc *h2Conn) establishConn() error {
+	preader, pwriter := io.Pipe()
+
+	host := hc.cfg.Hosts[rand.Intn(len(hc.cfg.Hosts))]
+	path := hc.cfg.Path
+	// TODO: connect use VMess Host instead of H2 Host
+	req := http.Request{
+		Method: "PUT",
+		Host:   host,
+		URL: &url.URL{
+			Scheme: "https",
+			Host:   host,
+			Path:   path,
+		},
+		Proto:      "HTTP/2",
+		ProtoMajor: 2,
+		ProtoMinor: 0,
+		Body:       preader,
+		Header: map[string][]string{
+			"Accept-Encoding": {"identity"},
+		},
+	}
+
+	// it will be close at :  `func (hc *h2Conn) Close() error`
+	res, err := hc.ClientConn.RoundTrip(&req)
+	if err != nil {
+		return err
+	}
+
+	hc.pwriter = pwriter
+	hc.res = res
+
+	return nil
+}
+
+// Read implements net.Conn.Read()
+func (hc *h2Conn) Read(b []byte) (int, error) {
+	if hc.res != nil && !hc.res.Close {
+		n, err := hc.res.Body.Read(b)
+		return n, err
+	}
+
+	if err := hc.establishConn(); err != nil {
+		return 0, err
+	}
+	return hc.res.Body.Read(b)
+}
+
+// Write implements io.Writer.
+func (hc *h2Conn) Write(b []byte) (int, error) {
+	if hc.pwriter != nil {
+		return hc.pwriter.Write(b)
+	}
+
+	if err := hc.establishConn(); err != nil {
+		return 0, err
+	}
+	return hc.pwriter.Write(b)
+}
+
+func (hc *h2Conn) Close() error {
+	if err := hc.pwriter.Close(); err != nil {
+		return err
+	}
+	if err := hc.ClientConn.Shutdown(hc.res.Request.Context()); err != nil {
+		return err
+	}
+	if err := hc.Conn.Close(); err != nil {
+		return err
+	}
+	return nil
+}
+
+func StreamH2Conn(conn net.Conn, cfg *H2Config) (net.Conn, error) {
+	transport := &http2.Transport{}
+
+	cconn, err := transport.NewClientConn(conn)
+	if err != nil {
+		return nil, err
+	}
+
+	return &h2Conn{
+		Conn:       conn,
+		ClientConn: cconn,
+		cfg:        cfg,
+	}, nil
+}

component/vmess/tls.go

@@ -9,6 +9,7 @@ type TLSConfig struct {
 	Host           string
 	SkipCertVerify bool
 	SessionCache   tls.ClientSessionCache
+	NextProtos     []string
 }
 
 func StreamTLSConn(conn net.Conn, cfg *TLSConfig) (net.Conn, error) {
@@ -16,6 +17,7 @@ func StreamTLSConn(conn net.Conn, cfg *TLSConfig) (net.Conn, error) {
 		ServerName:         cfg.Host,
 		InsecureSkipVerify: cfg.SkipCertVerify,
 		ClientSessionCache: cfg.SessionCache,
+		NextProtos:         cfg.NextProtos,
 	}
 
 	tlsConn := tls.Client(conn, tlsConfig)

component/vmess/vmess.go

@@ -1,12 +1,10 @@
 package vmess
 
 import (
-	"crypto/tls"
 	"fmt"
 	"math/rand"
 	"net"
 	"runtime"
-	"sync"
 
 	"github.com/gofrs/uuid"
 )
@@ -37,11 +35,6 @@ var CipherMapping = map[string]byte{
 	"chacha20-poly1305": SecurityCHACHA20POLY1305,
 }
 
-var (
-	clientSessionCache tls.ClientSessionCache
-	once               sync.Once
-)
-
 // Command types
 const (
 	CommandTCP byte = 1
@@ -106,7 +99,7 @@ func NewClient(config Config) (*Client, error) {
 			security = SecurityAES128GCM
 		}
 	default:
-		return nil, fmt.Errorf("Unknown security type: %s", config.Security)
+		return nil, fmt.Errorf("unknown security type: %s", config.Security)
 	}
 
 	return &Client{

component/vmess/websocket.go

@@ -73,7 +73,7 @@ func (wsc *websocketConn) Close() error {
 		errors = append(errors, err.Error())
 	}
 	if len(errors) > 0 {
-		return fmt.Errorf("Failed to close connection: %s", strings.Join(errors, ","))
+		return fmt.Errorf("failed to close connection: %s", strings.Join(errors, ","))
 	}
 	return nil
 }
@@ -159,7 +159,7 @@ func StreamWebsocketConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
 		if resp != nil {
 			reason = resp.Status
 		}
-		return nil, fmt.Errorf("Dial %s error: %s", uri.Host, reason)
+		return nil, fmt.Errorf("dial %s error: %s", uri.Host, reason)
 	}
 
 	return &websocketConn{

config/config.go

@@ -30,7 +30,7 @@ type General struct {
 	Mode      T.TunnelMode `json:"mode"`
 	LogLevel  log.LogLevel `json:"log-level"`
 	IPv6      bool         `json:"ipv6"`
-	Interface string       `json:"interface-name"`
+	Interface string       `json:"-"`
 }
 
 // Inbound
@@ -38,6 +38,7 @@ type Inbound struct {
 	Port           int      `json:"port"`
 	SocksPort      int      `json:"socks-port"`
 	RedirPort      int      `json:"redir-port"`
+	TProxyPort     int      `json:"tproxy-port"`
 	MixedPort      int      `json:"mixed-port"`
 	Authentication []string `json:"authentication"`
 	AllowLan       bool     `json:"allow-lan"`
@@ -62,12 +63,19 @@ type DNS struct {
 	EnhancedMode      dns.EnhancedMode `yaml:"enhanced-mode"`
 	DefaultNameserver []dns.NameServer `yaml:"default-nameserver"`
 	FakeIPRange       *fakeip.Pool
+	Hosts             *trie.DomainTrie
 }
 
 // FallbackFilter config
 type FallbackFilter struct {
 	GeoIP  bool         `yaml:"geoip"`
 	IPCIDR []*net.IPNet `yaml:"ipcidr"`
+	Domain []string     `yaml:"domain"`
+}
+
+// Profile config
+type Profile struct {
+	StoreSelected bool `yaml:"store-selected"`
 }
 
 // Experimental config
@@ -79,6 +87,7 @@ type Config struct {
 	DNS          *DNS
 	Experimental *Experimental
 	Hosts        *trie.DomainTrie
+	Profile      *Profile
 	Rules        []C.Rule
 	Users        []auth.AuthUser
 	Proxies      map[string]C.Proxy
@@ -88,6 +97,7 @@ type Config struct {
 type RawDNS struct {
 	Enable            bool              `yaml:"enable"`
 	IPv6              bool              `yaml:"ipv6"`
+	UseHosts          bool              `yaml:"use-hosts"`
 	NameServer        []string          `yaml:"nameserver"`
 	Fallback          []string          `yaml:"fallback"`
 	FallbackFilter    RawFallbackFilter `yaml:"fallback-filter"`
@@ -101,12 +111,14 @@ type RawDNS struct {
 type RawFallbackFilter struct {
 	GeoIP  bool     `yaml:"geoip"`
 	IPCIDR []string `yaml:"ipcidr"`
+	Domain []string `yaml:"domain"`
 }
 
 type RawConfig struct {
 	Port               int          `yaml:"port"`
 	SocksPort          int          `yaml:"socks-port"`
 	RedirPort          int          `yaml:"redir-port"`
+	TProxyPort         int          `yaml:"tproxy-port"`
 	MixedPort          int          `yaml:"mixed-port"`
 	Authentication     []string     `yaml:"authentication"`
 	AllowLan           bool         `yaml:"allow-lan"`
@@ -123,6 +135,7 @@ type RawConfig struct {
 	Hosts         map[string]string                 `yaml:"hosts"`
 	DNS           RawDNS                            `yaml:"dns"`
 	Experimental  Experimental                      `yaml:"experimental"`
+	Profile       Profile                           `yaml:"profile"`
 	Proxy         []map[string]interface{}          `yaml:"proxies"`
 	ProxyGroup    []map[string]interface{}          `yaml:"proxy-groups"`
 	Rule          []string                          `yaml:"rules"`
@@ -139,7 +152,7 @@ func Parse(buf []byte) (*Config, error) {
 }
 
 func UnmarshalRawConfig(buf []byte) (*RawConfig, error) {
-	// config with some default value
+	// config with default value
 	rawCfg := &RawConfig{
 		AllowLan:       false,
 		BindAddress:    "*",
@@ -152,6 +165,7 @@ func UnmarshalRawConfig(buf []byte) (*RawConfig, error) {
 		ProxyGroup:     []map[string]interface{}{},
 		DNS: RawDNS{
 			Enable:      false,
+			UseHosts:    true,
 			FakeIPRange: "198.18.0.1/16",
 			FallbackFilter: RawFallbackFilter{
 				GeoIP:  true,
@@ -162,6 +176,9 @@ func UnmarshalRawConfig(buf []byte) (*RawConfig, error) {
 				"8.8.8.8",
 			},
 		},
+		Profile: Profile{
+			StoreSelected: true,
+		},
 	}
 
 	if err := yaml.Unmarshal(buf, &rawCfg); err != nil {
@@ -175,6 +192,7 @@ func ParseRawConfig(rawCfg *RawConfig) (*Config, error) {
 	config := &Config{}
 
 	config.Experimental = &rawCfg.Experimental
+	config.Profile = &rawCfg.Profile
 
 	general, err := parseGeneral(rawCfg)
 	if err != nil {
@@ -195,18 +213,18 @@ func ParseRawConfig(rawCfg *RawConfig) (*Config, error) {
 	}
 	config.Rules = rules
 
-	dnsCfg, err := parseDNS(rawCfg.DNS)
-	if err != nil {
-		return nil, err
-	}
-	config.DNS = dnsCfg
-
 	hosts, err := parseHosts(rawCfg)
 	if err != nil {
 		return nil, err
 	}
 	config.Hosts = hosts
 
+	dnsCfg, err := parseDNS(rawCfg.DNS, hosts)
+	if err != nil {
+		return nil, err
+	}
+	config.DNS = dnsCfg
+
 	config.Users = parseAuthentication(rawCfg.Authentication)
 
 	return config, nil
@@ -229,6 +247,7 @@ func parseGeneral(cfg *RawConfig) (*General, error) {
 			Port:        cfg.Port,
 			SocksPort:   cfg.SocksPort,
 			RedirPort:   cfg.RedirPort,
+			TProxyPort:  cfg.TProxyPort,
 			MixedPort:   cfg.MixedPort,
 			AllowLan:    cfg.AllowLan,
 			BindAddress: cfg.BindAddress,
@@ -261,11 +280,11 @@ func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[
 	for idx, mapping := range proxiesConfig {
 		proxy, err := outbound.ParseProxy(mapping)
 		if err != nil {
-			return nil, nil, fmt.Errorf("Proxy %d: %w", idx, err)
+			return nil, nil, fmt.Errorf("proxy %d: %w", idx, err)
 		}
 
 		if _, exist := proxies[proxy.Name()]; exist {
-			return nil, nil, fmt.Errorf("Proxy %s is the duplicate name", proxy.Name())
+			return nil, nil, fmt.Errorf("proxy %s is the duplicate name", proxy.Name())
 		}
 		proxies[proxy.Name()] = proxy
 		proxyList = append(proxyList, proxy.Name())
@@ -275,7 +294,7 @@ func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[
 	for idx, mapping := range groupsConfig {
 		groupName, existName := mapping["name"].(string)
 		if !existName {
-			return nil, nil, fmt.Errorf("ProxyGroup %d: missing name", idx)
+			return nil, nil, fmt.Errorf("proxy group %d: missing name", idx)
 		}
 		proxyList = append(proxyList, groupName)
 	}
@@ -310,12 +329,12 @@ func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[
 	for idx, mapping := range groupsConfig {
 		group, err := outboundgroup.ParseProxyGroup(mapping, proxies, providersMap)
 		if err != nil {
-			return nil, nil, fmt.Errorf("ProxyGroup[%d]: %w", idx, err)
+			return nil, nil, fmt.Errorf("proxy group[%d]: %w", idx, err)
 		}
 
 		groupName := group.Name()
 		if _, exist := proxies[groupName]; exist {
-			return nil, nil, fmt.Errorf("ProxyGroup %s: the duplicate name", groupName)
+			return nil, nil, fmt.Errorf("proxy group %s: the duplicate name", groupName)
 		}
 
 		proxies[groupName] = outbound.NewProxy(group)
@@ -337,11 +356,16 @@ func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[
 	for _, v := range proxyList {
 		ps = append(ps, proxies[v])
 	}
-	hc := provider.NewHealthCheck(ps, "", 0)
+	hc := provider.NewHealthCheck(ps, "", 0, true)
 	pd, _ := provider.NewCompatibleProvider(provider.ReservedName, ps, hc)
 	providersMap[provider.ReservedName] = pd
 
-	global := outboundgroup.NewSelector("GLOBAL", []provider.ProxyProvider{pd})
+	global := outboundgroup.NewSelector(
+		&outboundgroup.GroupCommonOption{
+			Name: "GLOBAL",
+		},
+		[]provider.ProxyProvider{pd},
+	)
 	proxies["GLOBAL"] = outbound.NewProxy(global)
 	return proxies, providersMap, nil
 }
@@ -370,11 +394,11 @@ func parseRules(cfg *RawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
 			target = rule[2]
 			params = rule[3:]
 		default:
-			return nil, fmt.Errorf("Rules[%d] [%s] error: format invalid", idx, line)
+			return nil, fmt.Errorf("rules[%d] [%s] error: format invalid", idx, line)
 		}
 
 		if _, ok := proxies[target]; !ok {
-			return nil, fmt.Errorf("Rules[%d] [%s] error: proxy [%s] not found", idx, line, target)
+			return nil, fmt.Errorf("rules[%d] [%s] error: proxy [%s] not found", idx, line, target)
 		}
 
 		rule = trimArr(rule)
@@ -382,7 +406,7 @@ func parseRules(cfg *RawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
 
 		parsed, parseErr := R.ParseRule(rule[0], payload, target, params)
 		if parseErr != nil {
-			return nil, fmt.Errorf("Rules[%d] [%s] error: %s", idx, line, parseErr.Error())
+			return nil, fmt.Errorf("rules[%d] [%s] error: %s", idx, line, parseErr.Error())
 		}
 
 		rules = append(rules, parsed)
@@ -396,7 +420,7 @@ func parseHosts(cfg *RawConfig) (*trie.DomainTrie, error) {
 
 	// add default hosts
 	if err := tree.Insert("localhost", net.IP{127, 0, 0, 1}); err != nil {
-		println(err.Error())
+		log.Errorln("insert localhost to host error: %s", err.Error())
 	}
 
 	if len(cfg.Hosts) != 0 {
@@ -490,9 +514,9 @@ func parseFallbackIPCIDR(ips []string) ([]*net.IPNet, error) {
 	return ipNets, nil
 }
 
-func parseDNS(cfg RawDNS) (*DNS, error) {
+func parseDNS(cfg RawDNS, hosts *trie.DomainTrie) (*DNS, error) {
 	if cfg.Enable && len(cfg.NameServer) == 0 {
-		return nil, fmt.Errorf("If DNS configuration is turned on, NameServer cannot be empty")
+		return nil, fmt.Errorf("if DNS configuration is turned on, NameServer cannot be empty")
 	}
 
 	dnsCfg := &DNS{
@@ -554,6 +578,11 @@ func parseDNS(cfg RawDNS) (*DNS, error) {
 	if fallbackip, err := parseFallbackIPCIDR(cfg.FallbackFilter.IPCIDR); err == nil {
 		dnsCfg.FallbackFilter.IPCIDR = fallbackip
 	}
+	dnsCfg.FallbackFilter.Domain = cfg.FallbackFilter.Domain
+
+	if cfg.UseHosts {
+		dnsCfg.Hosts = hosts
+	}
 
 	return dnsCfg, nil
 }

config/initial.go

@@ -12,7 +12,7 @@ import (
 )
 
 func downloadMMDB(path string) (err error) {
-	resp, err := http.Get("https://github.com/Dreamacro/maxmind-geoip/releases/latest/download/Country.mmdb")
+	resp, err := http.Get("https://cdn.jsdelivr.net/gh/Dreamacro/maxmind-geoip@release/Country.mmdb")
 	if err != nil {
 		return
 	}
@@ -32,18 +32,18 @@ func initMMDB() error {
 	if _, err := os.Stat(C.Path.MMDB()); os.IsNotExist(err) {
 		log.Infoln("Can't find MMDB, start download")
 		if err := downloadMMDB(C.Path.MMDB()); err != nil {
-			return fmt.Errorf("Can't download MMDB: %s", err.Error())
+			return fmt.Errorf("can't download MMDB: %s", err.Error())
 		}
 	}
 
 	if !mmdb.Verify() {
 		log.Warnln("MMDB invalid, remove and download")
 		if err := os.Remove(C.Path.MMDB()); err != nil {
-			return fmt.Errorf("Can't remove invalid MMDB: %s", err.Error())
+			return fmt.Errorf("can't remove invalid MMDB: %s", err.Error())
 		}
 
 		if err := downloadMMDB(C.Path.MMDB()); err != nil {
-			return fmt.Errorf("Can't download MMDB: %s", err.Error())
+			return fmt.Errorf("can't download MMDB: %s", err.Error())
 		}
 	}
 
@@ -55,7 +55,7 @@ func Init(dir string) error {
 	// initial homedir
 	if _, err := os.Stat(dir); os.IsNotExist(err) {
 		if err := os.MkdirAll(dir, 0777); err != nil {
-			return fmt.Errorf("Can't create config directory %s: %s", dir, err.Error())
+			return fmt.Errorf("can't create config directory %s: %s", dir, err.Error())
 		}
 	}
 
@@ -64,7 +64,7 @@ func Init(dir string) error {
 		log.Infoln("Can't find config, create a initial config file")
 		f, err := os.OpenFile(C.Path.Config(), os.O_CREATE|os.O_WRONLY, 0644)
 		if err != nil {
-			return fmt.Errorf("Can't create file %s: %s", C.Path.Config(), err.Error())
+			return fmt.Errorf("can't create file %s: %s", C.Path.Config(), err.Error())
 		}
 		f.Write([]byte(`port: 7890`))
 		f.Close()
@@ -72,7 +72,7 @@ func Init(dir string) error {
 
 	// initial mmdb
 	if err := initMMDB(); err != nil {
-		return fmt.Errorf("Can't initial MMDB: %w", err)
+		return fmt.Errorf("can't initial MMDB: %w", err)
 	}
 	return nil
 }

config/utils.go

@@ -15,15 +15,6 @@ func trimArr(arr []string) (r []string) {
 	return
 }
 
-func or(pointers ...*int) *int {
-	for _, p := range pointers {
-		if p != nil {
-			return p
-		}
-	}
-	return pointers[len(pointers)-1]
-}
-
 // Check if ProxyGroups form DAG(Directed Acyclic Graph), and sort all ProxyGroups by dependency order.
 // Meanwhile, record the original index in the config file.
 // If loop is detected, return an error with location of loop.
@@ -32,7 +23,7 @@ func proxyGroupsDagSort(groupsConfig []map[string]interface{}) error {
 		indegree int
 		// topological order
 		topo int
-		// the origional data in `groupsConfig`
+		// the original data in `groupsConfig`
 		data map[string]interface{}
 		// `outdegree` and `from` are used in loop locating
 		outdegree int
@@ -74,7 +65,7 @@ func proxyGroupsDagSort(groupsConfig []map[string]interface{}) error {
 	index := 0
 	queue := make([]string, 0)
 	for name, node := range graph {
-		// in the begning, put nodes that have `node.indegree == 0` into queue.
+		// in the beginning, put nodes that have `node.indegree == 0` into queue.
 		if node.indegree == 0 {
 			queue = append(queue, name)
 		}
@@ -153,5 +144,5 @@ func proxyGroupsDagSort(groupsConfig []map[string]interface{}) error {
 		loopElements = append(loopElements, name)
 		delete(graph, name)
 	}
-	return fmt.Errorf("Loop is detected in ProxyGroup, please check following ProxyGroups: %v", loopElements)
+	return fmt.Errorf("loop is detected in ProxyGroup, please check following ProxyGroups: %v", loopElements)
 }

constant/adapters.go

@@ -13,6 +13,7 @@ const (
 	Reject
 
 	Shadowsocks
+	ShadowsocksR
 	Snell
 	Socks5
 	Http
@@ -26,11 +27,6 @@ const (
 	LoadBalance
 )
 
-type ServerAdapter interface {
-	net.Conn
-	Metadata() *Metadata
-}
-
 type Connection interface {
 	Chains() Chain
 	AppendToChains(adapter ProxyAdapter)
@@ -49,6 +45,15 @@ func (c Chain) String() string {
 	}
 }
 
+func (c Chain) Last() string {
+	switch len(c) {
+	case 0:
+		return ""
+	default:
+		return c[0]
+	}
+}
+
 type Conn interface {
 	net.Conn
 	Connection
@@ -100,6 +105,8 @@ func (at AdapterType) String() string {
 
 	case Shadowsocks:
 		return "Shadowsocks"
+	case ShadowsocksR:
+		return "ShadowsocksR"
 	case Snell:
 		return "Snell"
 	case Socks5:
@@ -134,7 +141,7 @@ type UDPPacket interface {
 
 	// WriteBack writes the payload with source IP/Port equals addr
 	// - variable source IP/Port is important to STUN
-	// - if addr is not provided, WriteBack will wirte out UDP packet with SourceIP/Prot equals to origional Target,
+	// - if addr is not provided, WriteBack will write out UDP packet with SourceIP/Port equals to original Target,
 	//   this is important when using Fake-IP.
 	WriteBack(b []byte, addr net.Addr) (n int, err error)
 

constant/context.go

@@ -0,0 +1,23 @@
+package constant
+
+import (
+	"net"
+
+	"github.com/gofrs/uuid"
+)
+
+type PlainContext interface {
+	ID() uuid.UUID
+}
+
+type ConnContext interface {
+	PlainContext
+	Metadata() *Metadata
+	Conn() net.Conn
+}
+
+type PacketConnContext interface {
+	PlainContext
+	Metadata() *Metadata
+	PacketConn() net.PacketConn
+}

constant/metadata.go

@@ -19,6 +19,7 @@ const (
 	HTTPCONNECT
 	SOCKS
 	REDIR
+	TPROXY
 )
 
 type NetWork int
@@ -46,6 +47,8 @@ func (t Type) String() string {
 		return "Socks5"
 	case REDIR:
 		return "Redir"
+	case TPROXY:
+		return "TProxy"
 	default:
 		return "Unknown"
 	}

constant/path.go

@@ -56,3 +56,7 @@ func (p *path) Resolve(path string) string {
 func (p *path) MMDB() string {
 	return P.Join(p.homeDir, "Country.mmdb")
 }
+
+func (p *path) Cache() string {
+	return P.Join(p.homeDir, ".cache")
+}

constant/rule.go

@@ -10,6 +10,7 @@ const (
 	SrcIPCIDR
 	SrcPort
 	DstPort
+	Process
 	MATCH
 )
 
@@ -33,6 +34,8 @@ func (rt RuleType) String() string {
 		return "SrcPort"
 	case DstPort:
 		return "DstPort"
+	case Process:
+		return "Process"
 	case MATCH:
 		return "Match"
 	default:
@@ -45,5 +48,5 @@ type Rule interface {
 	Match(metadata *Metadata) bool
 	Adapter() string
 	Payload() string
-	NoResolveIP() bool
+	ShouldResolveIP() bool
 }

context/conn.go

@@ -0,0 +1,39 @@
+package context
+
+import (
+	"net"
+
+	C "github.com/Dreamacro/clash/constant"
+
+	"github.com/gofrs/uuid"
+)
+
+type ConnContext struct {
+	id       uuid.UUID
+	metadata *C.Metadata
+	conn     net.Conn
+}
+
+func NewConnContext(conn net.Conn, metadata *C.Metadata) *ConnContext {
+	id, _ := uuid.NewV4()
+	return &ConnContext{
+		id:       id,
+		metadata: metadata,
+		conn:     conn,
+	}
+}
+
+// ID implement C.ConnContext ID
+func (c *ConnContext) ID() uuid.UUID {
+	return c.id
+}
+
+// Metadata implement C.ConnContext Metadata
+func (c *ConnContext) Metadata() *C.Metadata {
+	return c.metadata
+}
+
+// Conn implement C.ConnContext Conn
+func (c *ConnContext) Conn() net.Conn {
+	return c.conn
+}

context/dns.go

@@ -0,0 +1,41 @@
+package context
+
+import (
+	"github.com/gofrs/uuid"
+	"github.com/miekg/dns"
+)
+
+const (
+	DNSTypeHost   = "host"
+	DNSTypeFakeIP = "fakeip"
+	DNSTypeRaw    = "raw"
+)
+
+type DNSContext struct {
+	id  uuid.UUID
+	msg *dns.Msg
+	tp  string
+}
+
+func NewDNSContext(msg *dns.Msg) *DNSContext {
+	id, _ := uuid.NewV4()
+	return &DNSContext{
+		id:  id,
+		msg: msg,
+	}
+}
+
+// ID implement C.PlainContext ID
+func (c *DNSContext) ID() uuid.UUID {
+	return c.id
+}
+
+// SetType set type of response
+func (c *DNSContext) SetType(tp string) {
+	c.tp = tp
+}
+
+// Type return type of response
+func (c *DNSContext) Type() string {
+	return c.tp
+}

context/http.go

@@ -0,0 +1,47 @@
+package context
+
+import (
+	"net"
+	"net/http"
+
+	C "github.com/Dreamacro/clash/constant"
+
+	"github.com/gofrs/uuid"
+)
+
+type HTTPContext struct {
+	id       uuid.UUID
+	metadata *C.Metadata
+	conn     net.Conn
+	req      *http.Request
+}
+
+func NewHTTPContext(conn net.Conn, req *http.Request, metadata *C.Metadata) *HTTPContext {
+	id, _ := uuid.NewV4()
+	return &HTTPContext{
+		id:       id,
+		metadata: metadata,
+		conn:     conn,
+		req:      req,
+	}
+}
+
+// ID implement C.ConnContext ID
+func (hc *HTTPContext) ID() uuid.UUID {
+	return hc.id
+}
+
+// Metadata implement C.ConnContext Metadata
+func (hc *HTTPContext) Metadata() *C.Metadata {
+	return hc.metadata
+}
+
+// Conn implement C.ConnContext Conn
+func (hc *HTTPContext) Conn() net.Conn {
+	return hc.conn
+}
+
+// Request return the http request struct
+func (hc *HTTPContext) Request() *http.Request {
+	return hc.req
+}

context/packetconn.go

@@ -0,0 +1,43 @@
+package context
+
+import (
+	"net"
+
+	C "github.com/Dreamacro/clash/constant"
+
+	"github.com/gofrs/uuid"
+)
+
+type PacketConnContext struct {
+	id         uuid.UUID
+	metadata   *C.Metadata
+	packetConn net.PacketConn
+}
+
+func NewPacketConnContext(metadata *C.Metadata) *PacketConnContext {
+	id, _ := uuid.NewV4()
+	return &PacketConnContext{
+		id:       id,
+		metadata: metadata,
+	}
+}
+
+// ID implement C.PacketConnContext ID
+func (pc *PacketConnContext) ID() uuid.UUID {
+	return pc.id
+}
+
+// Metadata implement C.PacketConnContext Metadata
+func (pc *PacketConnContext) Metadata() *C.Metadata {
+	return pc.metadata
+}
+
+// PacketConn implement C.PacketConnContext PacketConn
+func (pc *PacketConnContext) PacketConn() net.PacketConn {
+	return pc.packetConn
+}
+
+// InjectPacketConn injectPacketConn manually
+func (pc *PacketConnContext) InjectPacketConn(pconn C.PacketConn) {
+	pc.packetConn = pconn
+}