Chore: update dependencies and README.md

add command-line options to override `external-controller`, `secret` and `external-ui` (#531)

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,96 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: "[Bug]"
+labels: ''
+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！
+
+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!
+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 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
+
+Please understand that we close issues that fail to follow the 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. -->
+
+### clash core config
+<!--
+在下方附上 Clash core 脱敏后配置文件的内容
+Paste the Clash core configuration below.
+-->
+```
+……
+```
+
+### Clash log
+<!--
+在下方附上 Clash Core 的日志，log level 最好使用 DEBUG
+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)
+……
+* 网路环境或拓扑 (network conditions/topology)
+……
+* iptables，如果适用 (if applicable)
+……
+* ISP 有没有进行 DNS 污染 (is your ISP performing DNS pollution?)
+……
+* 其他
+……
+
+### 说明 Description
+
+<!--
+请详细、清晰地表达你要提出的论述，例如这个问题如何影响到你？你想实现什么功能？
+-->
+
+### 重现问题的具体布骤 Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. ……
+
+**我预期会发生……？**
+<!-- **Expected behavior:** [What you expected to happen] -->
+
+**实际上发生了什麽？**
+<!-- **Actual behavior:** [What actually happened] -->
+
+### 可能的解决方案 Possible Solution
+<!-- 此项非必须，但是如果你有想法的话欢迎提出。 -->
+<!-- Not obligatory, but suggest a fix/reason for the bug, -->
+<!-- or ideas how to implement the addition or change -->
+
+### 更多信息 More Information

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,78 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[Feature]"
+labels: ''
+assignees: ''
+
+---
+
+<!-- The English version is available. -->
+感谢你向 Clash Core 提交 Feature Request！
+在提交之前，请确认：
+
+- [ ] 我已经在 [Issue Tracker](……/) 中找过我要提出的请求
+
+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 a feature request towards the Clash core!
+But before so, please do the following checklist:
+
+- [ ] I have searched on the [issue tracker](……/) before creating the issue.
+
+Please understand that we close issues that fail to follow the issue template.
+-->
+
+我都确认过了，我要继续提交。
+<!-- None of the above, create a feature request -->
+------------------------------------------------------------------
+
+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. -->
+
+### Clash core config
+<!--
+在下方附上 Clash Core 脱敏后的配置内容
+Paste the Clash core configuration below.
+-->
+```
+……
+```
+
+### Clash log
+<!--
+在下方附上 Clash Core 的日志，log level 请使用 DEBUG
+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)
+……
+* 网路环境或拓扑 (network conditions/topology)
+……
+* iptables，如果适用 (if applicable)
+……
+* ISP 有没有进行 DNS 污染 (is your ISP performing DNS pollution?)
+……
+* 其他
+……
+
+### 说明 Description
+
+<!--
+请详细、清晰地表达你要提出的论述，例如这个问题如何影响到你？你想实现什么功能？目前 Clash Core 的行为是什麽？
+-->
+
+### 可能的解决方案 Possible Solution
+<!-- 此项非必须，但是如果你有想法的话欢迎提出。 -->
+<!-- Not obligatory, but suggest a fix/reason for the bug, -->
+<!-- or ideas how to implement the addition or change -->
+
+### 更多信息 More Information

.github/workflows/go.yml

@@ -6,16 +6,39 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-
-      - name: Set up Go 1.13
+      - name: Setup Go
         uses: actions/setup-go@v1
         with:
-          go-version: 1.13
-        id: go
+          go-version: 1.14.x
 
       - name: Check out code into the Go module directory
         uses: actions/checkout@v1
+      
+      - name: Cache go module
+        uses: actions/cache@v1
+        with:
+          path: ~/go/pkg/mod
+          key: ${{ runner.os }}-go-${{ hashFiles('**/go.sum') }}
+          restore-keys: |
+            ${{ runner.os }}-go-
 
-      - name: Get dependencies
+      - name: Get dependencies and run test
         run: |
           go test ./...
+
+      - name: Build
+        if: startsWith(github.ref, 'refs/tags/')
+        env:
+          NAME: clash
+          BINDIR: bin
+        run: make -j releases
+
+      - name: Upload Release
+        uses: softprops/action-gh-release@v1
+        if: startsWith(github.ref, 'refs/tags/')
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          files: bin/*
+          draft: true
+          prerelease: true

.travis.yml

@@ -1,26 +0,0 @@
-language: go
-sudo: false
-go:
-  - '1.13'
-install:
-  - "go mod download"
-env:
-  global:
-    - NAME=clash
-    - BINDIR=bin
-    - GO111MODULE=on
-script:
-  - go test ./...
-before_deploy: make -j releases
-deploy:
-  provider: releases
-  prerelease: true
-  skip_cleanup: true
-  api_key:
-    secure: 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
-  file: bin/*
-  file_glob: true
-  on:
-    repo: Dreamacro/clash
-    branch: master
-    tags: true

Dockerfile

@@ -1,9 +1,7 @@
 FROM golang:alpine as builder
 
 RUN apk add --no-cache make git && \
-    wget http://geolite.maxmind.com/download/geoip/database/GeoLite2-Country.tar.gz -O /tmp/GeoLite2-Country.tar.gz && \
-    tar zxvf /tmp/GeoLite2-Country.tar.gz -C /tmp && \
-    mv /tmp/GeoLite2-Country_*/GeoLite2-Country.mmdb /Country.mmdb
+    wget -O /Country.mmdb https://github.com/Dreamacro/maxmind-geoip/releases/latest/download/Country.mmdb
 WORKDIR /clash-src
 COPY . /clash-src
 RUN go mod download && \

Dockerfile.arm32v7

@@ -0,0 +1,20 @@
+FROM golang:alpine as builder
+
+RUN apk add --no-cache make git && \
+    wget -O /Country.mmdb https://github.com/Dreamacro/maxmind-geoip/releases/latest/download/Country.mmdb && \
+    wget -O /qemu-arm-static https://github.com/multiarch/qemu-user-static/releases/latest/download/qemu-arm-static && \
+    chmod +x /qemu-arm-static
+
+WORKDIR /clash-src
+COPY . /clash-src
+RUN go mod download && \
+    make linux-armv7 && \
+    mv ./bin/clash-linux-armv7 /clash
+
+FROM arm32v7/alpine:latest
+
+COPY --from=builder /qemu-arm-static /usr/bin/
+COPY --from=builder /Country.mmdb /root/.config/clash/
+COPY --from=builder /clash /
+RUN apk add --no-cache ca-certificates
+ENTRYPOINT ["/clash"]

Dockerfile.arm64v8

@@ -0,0 +1,20 @@
+FROM golang:alpine as builder
+
+RUN apk add --no-cache make git && \
+    wget -O /Country.mmdb https://github.com/Dreamacro/maxmind-geoip/releases/latest/download/Country.mmdb && \
+    wget -O /qemu-aarch64-static https://github.com/multiarch/qemu-user-static/releases/latest/download/qemu-aarch64-static && \
+    chmod +x /qemu-aarch64-static
+
+WORKDIR /clash-src
+COPY . /clash-src
+RUN go mod download && \
+    make linux-armv8 && \
+    mv ./bin/clash-linux-armv8 /clash
+
+FROM arm64v8/alpine:latest
+
+COPY --from=builder /qemu-aarch64-static /usr/bin/
+COPY --from=builder /Country.mmdb /root/.config/clash/
+COPY --from=builder /clash /
+RUN apk add --no-cache ca-certificates
+ENTRYPOINT ["/clash"]

LICENSE

@@ -1,21 +1,674 @@
-MIT License
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
 
-Copyright (c) 2018 Dreamacro
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
 
-Permission is hereby granted, free of charge, to any person obtaining a copy
-of this software and associated documentation files (the "Software"), to deal
-in the Software without restriction, including without limitation the rights
-to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-copies of the Software, and to permit persons to whom the Software is
-furnished to do so, subject to the following conditions:
+                            Preamble
 
-The above copyright notice and this permission notice shall be included in all
-copies or substantial portions of the Software.
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
 
-THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
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README.md

@@ -6,9 +6,8 @@
 <h4 align="center">A rule-based tunnel in Go.</h4>
 
 <p align="center">
-  <a href="https://travis-ci.org/Dreamacro/clash">
-    <img src="https://img.shields.io/travis/Dreamacro/clash.svg?style=flat-square"
-         alt="Travis-CI">
+  <a href="https://github.com/Dreamacro/clash/actions">
+    <img src="https://img.shields.io/github/workflow/status/Dreamacro/clash/Go?style=flat-square" alt="Github Actions">
   </a>
   <a href="https://goreportcard.com/report/github.com/Dreamacro/clash">
     <img src="https://goreportcard.com/badge/github.com/Dreamacro/clash?style=flat-square">
@@ -20,22 +19,25 @@
 
 ## Features
 
-- Local HTTP/HTTPS/SOCKS server
-- Surge-like configuration format
-- GeoIP rule support
-- Supports Vmess, Shadowsocks, Snell and SOCKS5 protocol
-- Supports Netfilter TCP redirecting
-- Comprehensive HTTP API
+- 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.
+- 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
 
 ## Install
 
-Clash Requires Go >= 1.13. You can build it from source:
+Clash requires Go >= 1.13. You can build it from source:
 
 ```sh
 $ go get -u -v github.com/Dreamacro/clash
 ```
 
-Pre-built binaries are available here: [release](https://github.com/Dreamacro/clash/releases)
+Pre-built binaries are available here: [release](https://github.com/Dreamacro/clash/releases)  
+Pre-built TUN mode binaries are available here: [TUN release](https://github.com/Dreamacro/clash/releases/tag/TUN). Source is not currently available.
 
 Check Clash version with:
 
@@ -43,21 +45,17 @@ Check Clash version with:
 $ clash -v
 ```
 
-## Daemon
+## Daemonize Clash
 
-Unfortunately, there is no native and elegant way to implement daemons on Golang.
+Unfortunately, there is no native or elegant way to implement daemons on Golang. We recommend using third-party daemon management tools like PM2, Supervisor or the like to keep Clash running as a service.
 
-So we can use third-party daemon tools like PM2, Supervisor or the like.
-
-In the case of [pm2](https://github.com/Unitech/pm2), we can start the daemon this way:
+In the case of [pm2](https://github.com/Unitech/pm2), start the daemon this way:
 
 ```sh
 $ pm2 start clash
 ```
 
-If you have Docker installed, you can run clash directly using `docker-compose`.
-
-[Run clash in docker](https://github.com/Dreamacro/clash/wiki/Run-clash-in-docker)
+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
 
@@ -74,7 +72,7 @@ $ clash -d .
 ```
 
 <details>
-  <summary>This is an example configuration file</summary>
+  <summary>This is an example configuration file (click to expand)</summary>
 
 ```yml
 # port of HTTP
@@ -94,7 +92,7 @@ allow-lan: false
 # "[aaaa::a8aa:ff:fe09:57d8]": bind a single IPv6 address
 # bind-address: "*"
 
-# Rule / Global/ Direct (default is Rule)
+# Rule / Global / Direct (default is Rule)
 mode: Rule
 
 # set log level to stdout (default is info)
@@ -114,6 +112,7 @@ external-controller: 127.0.0.1:9090
 # experimental feature
 experimental:
   ignore-resolve-fail: true # ignore dns resolve fail, default value is true
+  # interface-name: en0 # outbound interface name
 
 # authentication of local SOCKS5/HTTP(S) server
 # authentication:
@@ -121,17 +120,24 @@ experimental:
 #  - "user2:pass2"
 
 # # experimental 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)
+# # static domain has a higher priority than wildcard domain (foo.example.com > *.example.com > .example.com)
 # hosts:
 #   '*.clash.dev': 127.0.0.1
+#   '.dev': 127.0.0.1
 #   'alpha.clash.dev': '::1'
 
 # dns:
   # enable: true # set true to enable dns (default is false)
   # ipv6: false # 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
@@ -143,162 +149,232 @@ experimental:
   #   ipcidr: # ips in these subnets will be considered polluted
   #     - 240.0.0.0/4
 
-Proxy:
+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
 
-# 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 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
+  # old obfs configuration format remove after prerelease
+  - 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
 
-# old obfs configuration format remove after prerelease
-- 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
 
-- 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
+  # 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
-    # host: bing.com
-    # path: "/"
-    # mux: true
-    # headers:
-    #   custom: value
+    # 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
 
-# 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
-  # network: ws
-  # ws-path: /path
-  # ws-headers:
-  #   Host: v2ray.com
+  # socks5
+  - name: "socks"
+    type: socks5
+    server: server
+    port: 443
+    # username: username
+    # password: password
+    # tls: true
+    # skip-cert-verify: true
+    # udp: true
 
-# 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
 
-# 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
 
-# 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 Group:
-# url-test select which proxy will be used by benchmarking speed to a URL.
-- name: "auto"
-  type: url-test
-  proxies:
-    - ss1
-    - ss2
-    - vmess1
-  url: 'http://www.gstatic.com/generate_204'
-  interval: 300
+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
 
-# 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
+  # url-test select which proxy will be used by benchmarking speed to a URL.
+  - name: "auto"
+    type: url-test
+    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
+  # 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
 
-# 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
+  # 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
 
-Rule:
-- DOMAIN-SUFFIX,google.com,auto
-- DOMAIN-KEYWORD,google,auto
-- DOMAIN,google.com,auto
-- DOMAIN-SUFFIX,ad.com,REJECT
-- IP-CIDR,127.0.0.0/8,DIRECT
-# rename SOURCE-IP-CIDR and would remove after prerelease
-- SRC-IP-CIDR,192.168.1.201/32,DIRECT
-- GEOIP,CN,DIRECT
-- DST-PORT,80,DIRECT
-- SRC-PORT,7777,DIRECT
-# FINAL would remove after prerelease
-# you also can use `FINAL,Proxy` or `FINAL,,Proxy` now
-- MATCH,auto
+  # 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
+  # FINAL would remove after prerelease
+  # you also can use `FINAL,Proxy` or `FINAL,,Proxy` now
+  - MATCH,auto
 ```
 </details>
 
+## Advanced
+[Provider](https://github.com/Dreamacro/clash/wiki/Provider)
+
 ## Documentations
 https://clash.gitbook.io/
 
-## Thanks
+## Credits
 
 [riobard/go-shadowsocks2](https://github.com/riobard/go-shadowsocks2)
 
@@ -313,4 +389,5 @@ https://clash.gitbook.io/
 - [x] Complementing the necessary rule operators
 - [x] Redir proxy
 - [x] UDP support
-- [ ] Connection manager
+- [x] Connection manager
+- [ ] Event API

adapters/inbound/http.go

@@ -1,4 +1,4 @@
-package adapters
+package inbound
 
 import (
 	"net"
@@ -23,6 +23,7 @@ func (h *HTTPAdapter) Metadata() *C.Metadata {
 // NewHTTP is HTTPAdapter generator
 func NewHTTP(request *http.Request, conn net.Conn) *HTTPAdapter {
 	metadata := parseHTTPAddr(request)
+	metadata.Type = C.HTTP
 	if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {
 		metadata.SrcIP = ip
 		metadata.SrcPort = port

adapters/inbound/https.go

@@ -1,13 +1,16 @@
-package adapters
+package inbound
 
 import (
 	"net"
 	"net/http"
+
+	C "github.com/Dreamacro/clash/constant"
 )
 
 // NewHTTPS is HTTPAdapter generator
 func NewHTTPS(request *http.Request, conn net.Conn) *SocketAdapter {
 	metadata := parseHTTPAddr(request)
+	metadata.Type = C.HTTPCONNECT
 	if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {
 		metadata.SrcIP = ip
 		metadata.SrcPort = port

adapters/inbound/packet.go

@@ -0,0 +1,33 @@
+package inbound
+
+import (
+	"github.com/Dreamacro/clash/component/socks5"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+// PacketAdapter is a UDP Packet adapter for socks/redir/tun
+type PacketAdapter struct {
+	C.UDPPacket
+	metadata *C.Metadata
+}
+
+// Metadata returns destination metadata
+func (s *PacketAdapter) Metadata() *C.Metadata {
+	return s.metadata
+}
+
+// NewPacket is PacketAdapter generator
+func NewPacket(target socks5.Addr, packet C.UDPPacket, source C.Type) *PacketAdapter {
+	metadata := parseSocksAddr(target)
+	metadata.NetWork = C.UDP
+	metadata.Type = source
+	if ip, port, err := parseAddr(packet.LocalAddr().String()); err == nil {
+		metadata.SrcIP = ip
+		metadata.SrcPort = port
+	}
+
+	return &PacketAdapter{
+		UDPPacket: packet,
+		metadata:  metadata,
+	}
+}

adapters/inbound/socket.go

@@ -1,4 +1,4 @@
-package adapters
+package inbound
 
 import (
 	"net"
@@ -19,9 +19,9 @@ func (s *SocketAdapter) Metadata() *C.Metadata {
 }
 
 // NewSocket is SocketAdapter generator
-func NewSocket(target socks5.Addr, conn net.Conn, source C.Type, netType C.NetWork) *SocketAdapter {
+func NewSocket(target socks5.Addr, conn net.Conn, source C.Type) *SocketAdapter {
 	metadata := parseSocksAddr(target)
-	metadata.NetWork = netType
+	metadata.NetWork = C.TCP
 	metadata.Type = source
 	if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {
 		metadata.SrcIP = ip

adapters/inbound/util.go

@@ -1,4 +1,4 @@
-package adapters
+package inbound
 
 import (
 	"net"
@@ -20,11 +20,11 @@ func parseSocksAddr(target socks5.Addr) *C.Metadata {
 		metadata.DstPort = strconv.Itoa((int(target[2+target[1]]) << 8) | int(target[2+target[1]+1]))
 	case socks5.AtypIPv4:
 		ip := net.IP(target[1 : 1+net.IPv4len])
-		metadata.DstIP = &ip
+		metadata.DstIP = ip
 		metadata.DstPort = strconv.Itoa((int(target[1+net.IPv4len]) << 8) | int(target[1+net.IPv4len+1]))
 	case socks5.AtypIPv6:
 		ip := net.IP(target[1 : 1+net.IPv6len])
-		metadata.DstIP = &ip
+		metadata.DstIP = ip
 		metadata.DstPort = strconv.Itoa((int(target[1+net.IPv6len]) << 8) | int(target[1+net.IPv6len+1]))
 	}
 
@@ -40,7 +40,6 @@ func parseHTTPAddr(request *http.Request) *C.Metadata {
 
 	metadata := &C.Metadata{
 		NetWork:  C.TCP,
-		Type:     C.HTTP,
 		AddrType: C.AtypDomainName,
 		Host:     host,
 		DstIP:    nil,
@@ -55,18 +54,18 @@ func parseHTTPAddr(request *http.Request) *C.Metadata {
 		default:
 			metadata.AddrType = C.AtypIPv4
 		}
-		metadata.DstIP = &ip
+		metadata.DstIP = ip
 	}
 
 	return metadata
 }
 
-func parseAddr(addr string) (*net.IP, string, error) {
+func parseAddr(addr string) (net.IP, string, error) {
 	host, port, err := net.SplitHostPort(addr)
 	if err != nil {
 		return nil, "", err
 	}
 
 	ip := net.ParseIP(host)
-	return &ip, port, nil
+	return ip, port, nil
 }

adapters/outbound/base.go

@@ -1,4 +1,4 @@
-package adapters
+package outbound
 
 import (
 	"context"
@@ -18,6 +18,7 @@ var (
 
 type Base struct {
 	name string
+	addr string
 	tp   C.AdapterType
 	udp  bool
 }
@@ -30,22 +31,36 @@ func (b *Base) Type() C.AdapterType {
 	return b.tp
 }
 
-func (b *Base) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	return nil, nil, errors.New("no support")
+func (b *Base) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
+	return c, errors.New("no support")
+}
+
+func (b *Base) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	return nil, errors.New("no support")
 }
 
 func (b *Base) SupportUDP() bool {
 	return b.udp
 }
 
-func (b *Base) Destroy() {}
-
 func (b *Base) MarshalJSON() ([]byte, error) {
 	return json.Marshal(map[string]string{
 		"type": b.Type().String(),
 	})
 }
 
+func (b *Base) Addr() string {
+	return b.addr
+}
+
+func (b *Base) Unwrap(metadata *C.Metadata) C.Proxy {
+	return nil
+}
+
+func NewBase(name string, addr string, tp C.AdapterType, udp bool) *Base {
+	return &Base{name, addr, tp, udp}
+}
+
 type conn struct {
 	net.Conn
 	chain C.Chain
@@ -59,12 +74,17 @@ func (c *conn) AppendToChains(a C.ProxyAdapter) {
 	c.chain = append(c.chain, a.Name())
 }
 
-func newConn(c net.Conn, a C.ProxyAdapter) C.Conn {
+func NewConn(c net.Conn, a C.ProxyAdapter) C.Conn {
 	return &conn{c, []string{a.Name()}}
 }
 
-type packetConn struct {
+type PacketConn interface {
 	net.PacketConn
+	WriteWithMetadata(p []byte, metadata *C.Metadata) (n int, err error)
+}
+
+type packetConn struct {
+	PacketConn
 	chain C.Chain
 }
 
@@ -76,8 +96,8 @@ func (c *packetConn) AppendToChains(a C.ProxyAdapter) {
 	c.chain = append(c.chain, a.Name())
 }
 
-func newPacketConn(c net.PacketConn, a C.ProxyAdapter) C.PacketConn {
-	return &packetConn{c, []string{a.Name()}}
+func newPacketConn(pc PacketConn, a C.ProxyAdapter) C.PacketConn {
+	return &packetConn{pc, []string{a.Name()}}
 }
 
 type Proxy struct {
@@ -140,6 +160,7 @@ func (p *Proxy) MarshalJSON() ([]byte, error) {
 	mapping := map[string]interface{}{}
 	json.Unmarshal(inner, &mapping)
 	mapping["history"] = p.DelayHistory()
+	mapping["name"] = p.Name()
 	return json.Marshal(mapping)
 }
 
@@ -186,7 +207,12 @@ func (p *Proxy) URLTest(ctx context.Context, url string) (t uint16, err error) {
 		ExpectContinueTimeout: 1 * time.Second,
 	}
 
-	client := http.Client{Transport: transport}
+	client := http.Client{
+		Transport: transport,
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+	}
 	resp, err := client.Do(req)
 	if err != nil {
 		return
@@ -199,9 +225,3 @@ 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}
 }
-
-// ProxyGroupOption contain the common options for all kind of ProxyGroup
-type ProxyGroupOption struct {
-	Name    string   `proxy:"name"`
-	Proxies []string `proxy:"proxies"`
-}

adapters/outbound/direct.go

@@ -1,9 +1,11 @@
-package adapters
+package outbound
 
 import (
 	"context"
 	"net"
 
+	"github.com/Dreamacro/clash/component/dialer"
+	"github.com/Dreamacro/clash/component/resolver"
 	C "github.com/Dreamacro/clash/constant"
 )
 
@@ -12,30 +14,37 @@ type Direct struct {
 }
 
 func (d *Direct) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	address := net.JoinHostPort(metadata.Host, metadata.DstPort)
-	if metadata.DstIP != nil {
-		address = net.JoinHostPort(metadata.DstIP.String(), metadata.DstPort)
-	}
+	address := net.JoinHostPort(metadata.String(), metadata.DstPort)
 
-	c, err := dialContext(ctx, "tcp", address)
+	c, err := dialer.DialContext(ctx, "tcp", address)
 	if err != nil {
 		return nil, err
 	}
 	tcpKeepAlive(c)
-	return newConn(c, d), nil
+	return NewConn(c, d), nil
 }
 
-func (d *Direct) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	pc, err := net.ListenPacket("udp", "")
+func (d *Direct) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	pc, err := dialer.ListenPacket("udp", "")
 	if err != nil {
-		return nil, nil, err
+		return nil, err
 	}
+	return newPacketConn(&directPacketConn{pc}, d), nil
+}
 
-	addr, err := resolveUDPAddr("udp", metadata.RemoteAddress())
-	if err != nil {
-		return nil, nil, err
+type directPacketConn struct {
+	net.PacketConn
+}
+
+func (dp *directPacketConn) WriteWithMetadata(p []byte, metadata *C.Metadata) (n int, err error) {
+	if !metadata.Resolved() {
+		ip, err := resolver.ResolveIP(metadata.Host)
+		if err != nil {
+			return 0, err
+		}
+		metadata.DstIP = ip
 	}
-	return newPacketConn(pc, d), addr, nil
+	return dp.WriteTo(p, metadata.UDPAddr())
 }
 
 func NewDirect() *Direct {

adapters/outbound/fallback.go

@@ -1,134 +0,0 @@
-package adapters
-
-import (
-	"context"
-	"encoding/json"
-	"errors"
-	"net"
-	"sync"
-	"time"
-
-	C "github.com/Dreamacro/clash/constant"
-)
-
-type Fallback struct {
-	*Base
-	proxies  []C.Proxy
-	rawURL   string
-	interval time.Duration
-	done     chan struct{}
-}
-
-type FallbackOption struct {
-	Name     string   `proxy:"name"`
-	Proxies  []string `proxy:"proxies"`
-	URL      string   `proxy:"url"`
-	Interval int      `proxy:"interval"`
-}
-
-func (f *Fallback) Now() string {
-	proxy := f.findAliveProxy()
-	return proxy.Name()
-}
-
-func (f *Fallback) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	proxy := f.findAliveProxy()
-	c, err := proxy.DialContext(ctx, metadata)
-	if err == nil {
-		c.AppendToChains(f)
-	}
-	return c, err
-}
-
-func (f *Fallback) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	proxy := f.findAliveProxy()
-	pc, addr, err := proxy.DialUDP(metadata)
-	if err == nil {
-		pc.AppendToChains(f)
-	}
-	return pc, addr, err
-}
-
-func (f *Fallback) SupportUDP() bool {
-	proxy := f.findAliveProxy()
-	return proxy.SupportUDP()
-}
-
-func (f *Fallback) MarshalJSON() ([]byte, error) {
-	var all []string
-	for _, proxy := range f.proxies {
-		all = append(all, proxy.Name())
-	}
-	return json.Marshal(map[string]interface{}{
-		"type": f.Type().String(),
-		"now":  f.Now(),
-		"all":  all,
-	})
-}
-
-func (f *Fallback) Destroy() {
-	f.done <- struct{}{}
-}
-
-func (f *Fallback) loop() {
-	tick := time.NewTicker(f.interval)
-	go f.validTest()
-Loop:
-	for {
-		select {
-		case <-tick.C:
-			go f.validTest()
-		case <-f.done:
-			break Loop
-		}
-	}
-}
-
-func (f *Fallback) findAliveProxy() C.Proxy {
-	for _, proxy := range f.proxies {
-		if proxy.Alive() {
-			return proxy
-		}
-	}
-	return f.proxies[0]
-}
-
-func (f *Fallback) validTest() {
-	wg := sync.WaitGroup{}
-	wg.Add(len(f.proxies))
-
-	for _, p := range f.proxies {
-		go func(p C.Proxy) {
-			p.URLTest(context.Background(), f.rawURL)
-			wg.Done()
-		}(p)
-	}
-
-	wg.Wait()
-}
-
-func NewFallback(option FallbackOption, proxies []C.Proxy) (*Fallback, error) {
-	_, err := urlToMetadata(option.URL)
-	if err != nil {
-		return nil, err
-	}
-
-	if len(proxies) < 1 {
-		return nil, errors.New("The number of proxies cannot be 0")
-	}
-
-	interval := time.Duration(option.Interval) * time.Second
-
-	Fallback := &Fallback{
-		Base: &Base{
-			name: option.Name,
-			tp:   C.Fallback,
-		},
-		proxies:  proxies,
-		rawURL:   option.URL,
-		interval: interval,
-		done:     make(chan struct{}),
-	}
-	go Fallback.loop()
-	return Fallback, nil
-}

adapters/outbound/http.go

@@ -1,8 +1,7 @@
-package adapters
+package outbound
 
 import (
 	"bufio"
-	"bytes"
 	"context"
 	"crypto/tls"
 	"encoding/base64"
@@ -11,19 +10,18 @@ import (
 	"io"
 	"net"
 	"net/http"
+	"net/url"
 	"strconv"
 
+	"github.com/Dreamacro/clash/component/dialer"
 	C "github.com/Dreamacro/clash/constant"
 )
 
 type Http struct {
 	*Base
-	addr           string
-	user           string
-	pass           string
-	tls            bool
-	skipCertVerify bool
-	tlsConfig      *tls.Config
+	user      string
+	pass      string
+	tlsConfig *tls.Config
 }
 
 type HttpOption struct {
@@ -36,48 +34,60 @@ type HttpOption struct {
 	SkipCertVerify bool   `proxy:"skip-cert-verify,omitempty"`
 }
 
-func (h *Http) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := dialContext(ctx, "tcp", h.addr)
-	if err == nil && h.tls {
+func (h *Http) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
+	if h.tlsConfig != nil {
 		cc := tls.Client(c, h.tlsConfig)
-		err = cc.Handshake()
+		err := cc.Handshake()
 		c = cc
+		if err != nil {
+			return nil, fmt.Errorf("%s connect error: %w", h.addr, err)
+		}
 	}
 
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error", h.addr)
-	}
-	tcpKeepAlive(c)
 	if err := h.shakeHand(metadata, c); err != nil {
 		return nil, err
 	}
+	return c, nil
+}
 
-	return newConn(c, h), nil
+func (h *Http) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	c, err := dialer.DialContext(ctx, "tcp", h.addr)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", h.addr, err)
+	}
+	tcpKeepAlive(c)
+
+	c, err = h.StreamConn(c, metadata)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewConn(c, h), nil
 }
 
 func (h *Http) shakeHand(metadata *C.Metadata, rw io.ReadWriter) error {
-	var buf bytes.Buffer
-	var err error
-
 	addr := metadata.RemoteAddress()
-	buf.WriteString("CONNECT " + addr + " HTTP/1.1\r\n")
-	buf.WriteString("Host: " + metadata.String() + "\r\n")
-	buf.WriteString("Proxy-Connection: Keep-Alive\r\n")
+	req := &http.Request{
+		Method: http.MethodConnect,
+		URL: &url.URL{
+			Host: addr,
+		},
+		Host: addr,
+		Header: http.Header{
+			"Proxy-Connection": []string{"Keep-Alive"},
+		},
+	}
 
 	if h.user != "" && h.pass != "" {
 		auth := h.user + ":" + h.pass
-		buf.WriteString("Proxy-Authorization: Basic " + base64.StdEncoding.EncodeToString([]byte(auth)) + "\r\n")
+		req.Header.Add("Proxy-Authorization", "Basic "+base64.StdEncoding.EncodeToString([]byte(auth)))
 	}
-	// header ended
-	buf.WriteString("\r\n")
 
-	_, err = rw.Write(buf.Bytes())
-	if err != nil {
+	if err := req.Write(rw); err != nil {
 		return err
 	}
 
-	var req http.Request
-	resp, err := http.ReadResponse(bufio.NewReader(rw), &req)
+	resp, err := http.ReadResponse(bufio.NewReader(rw), req)
 	if err != nil {
 		return err
 	}
@@ -97,6 +107,7 @@ func (h *Http) shakeHand(metadata *C.Metadata, rw io.ReadWriter) error {
 	if resp.StatusCode >= http.StatusInternalServerError {
 		return errors.New(resp.Status)
 	}
+
 	return fmt.Errorf("can not connect remote err code: %d", resp.StatusCode)
 }
 
@@ -113,13 +124,11 @@ func NewHttp(option HttpOption) *Http {
 	return &Http{
 		Base: &Base{
 			name: option.Name,
+			addr: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 			tp:   C.Http,
 		},
-		addr:           net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
-		user:           option.UserName,
-		pass:           option.Password,
-		tls:            option.TLS,
-		skipCertVerify: option.SkipCertVerify,
-		tlsConfig:      tlsConfig,
+		user:      option.UserName,
+		pass:      option.Password,
+		tlsConfig: tlsConfig,
 	}
 }

adapters/outbound/loadbalance.go

@@ -1,172 +0,0 @@
-package adapters
-
-import (
-	"context"
-	"encoding/json"
-	"errors"
-	"net"
-	"sync"
-	"time"
-
-	"github.com/Dreamacro/clash/common/murmur3"
-	C "github.com/Dreamacro/clash/constant"
-
-	"golang.org/x/net/publicsuffix"
-)
-
-type LoadBalance struct {
-	*Base
-	proxies  []C.Proxy
-	maxRetry int
-	rawURL   string
-	interval time.Duration
-	done     chan struct{}
-}
-
-func getKey(metadata *C.Metadata) string {
-	if metadata.Host != "" {
-		// ip host
-		if ip := net.ParseIP(metadata.Host); ip != nil {
-			return metadata.Host
-		}
-
-		if etld, err := publicsuffix.EffectiveTLDPlusOne(metadata.Host); err == nil {
-			return etld
-		}
-	}
-
-	if metadata.DstIP == nil {
-		return ""
-	}
-
-	return metadata.DstIP.String()
-}
-
-func jumpHash(key uint64, buckets int32) int32 {
-	var b, j int64
-
-	for j < int64(buckets) {
-		b = j
-		key = key*2862933555777941757 + 1
-		j = int64(float64(b+1) * (float64(int64(1)<<31) / float64((key>>33)+1)))
-	}
-
-	return int32(b)
-}
-
-func (lb *LoadBalance) DialContext(ctx context.Context, metadata *C.Metadata) (c C.Conn, err error) {
-	defer func() {
-		if err == nil {
-			c.AppendToChains(lb)
-		}
-	}()
-
-	key := uint64(murmur3.Sum32([]byte(getKey(metadata))))
-	buckets := int32(len(lb.proxies))
-	for i := 0; i < lb.maxRetry; i, key = i+1, key+1 {
-		idx := jumpHash(key, buckets)
-		proxy := lb.proxies[idx]
-		if proxy.Alive() {
-			c, err = proxy.DialContext(ctx, metadata)
-			return
-		}
-	}
-	c, err = lb.proxies[0].DialContext(ctx, metadata)
-	return
-}
-
-func (lb *LoadBalance) DialUDP(metadata *C.Metadata) (pc C.PacketConn, addr net.Addr, err error) {
-	defer func() {
-		if err == nil {
-			pc.AppendToChains(lb)
-		}
-	}()
-
-	key := uint64(murmur3.Sum32([]byte(getKey(metadata))))
-	buckets := int32(len(lb.proxies))
-	for i := 0; i < lb.maxRetry; i, key = i+1, key+1 {
-		idx := jumpHash(key, buckets)
-		proxy := lb.proxies[idx]
-		if proxy.Alive() {
-			return proxy.DialUDP(metadata)
-		}
-	}
-
-	return lb.proxies[0].DialUDP(metadata)
-}
-
-func (lb *LoadBalance) SupportUDP() bool {
-	return true
-}
-
-func (lb *LoadBalance) Destroy() {
-	lb.done <- struct{}{}
-}
-
-func (lb *LoadBalance) validTest() {
-	wg := sync.WaitGroup{}
-	wg.Add(len(lb.proxies))
-
-	for _, p := range lb.proxies {
-		go func(p C.Proxy) {
-			p.URLTest(context.Background(), lb.rawURL)
-			wg.Done()
-		}(p)
-	}
-
-	wg.Wait()
-}
-
-func (lb *LoadBalance) loop() {
-	tick := time.NewTicker(lb.interval)
-	go lb.validTest()
-Loop:
-	for {
-		select {
-		case <-tick.C:
-			go lb.validTest()
-		case <-lb.done:
-			break Loop
-		}
-	}
-}
-
-func (lb *LoadBalance) MarshalJSON() ([]byte, error) {
-	var all []string
-	for _, proxy := range lb.proxies {
-		all = append(all, proxy.Name())
-	}
-	return json.Marshal(map[string]interface{}{
-		"type": lb.Type().String(),
-		"all":  all,
-	})
-}
-
-type LoadBalanceOption struct {
-	Name     string   `proxy:"name"`
-	Proxies  []string `proxy:"proxies"`
-	URL      string   `proxy:"url"`
-	Interval int      `proxy:"interval"`
-}
-
-func NewLoadBalance(option LoadBalanceOption, proxies []C.Proxy) (*LoadBalance, error) {
-	if len(proxies) == 0 {
-		return nil, errors.New("Provide at least one proxy")
-	}
-
-	interval := time.Duration(option.Interval) * time.Second
-
-	lb := &LoadBalance{
-		Base: &Base{
-			name: option.Name,
-			tp:   C.LoadBalance,
-		},
-		proxies:  proxies,
-		maxRetry: 3,
-		rawURL:   option.URL,
-		interval: interval,
-		done:     make(chan struct{}),
-	}
-	go lb.loop()
-	return lb, nil
-}

adapters/outbound/parser.go

@@ -0,0 +1,76 @@
+package outbound
+
+import (
+	"fmt"
+
+	"github.com/Dreamacro/clash/common/structure"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+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")
+	}
+
+	var proxy C.ProxyAdapter
+	err := fmt.Errorf("Cannot parse")
+	switch proxyType {
+	case "ss":
+		ssOption := &ShadowSocksOption{}
+		err = decoder.Decode(mapping, ssOption)
+		if err != nil {
+			break
+		}
+		proxy, err = NewShadowSocks(*ssOption)
+	case "socks5":
+		socksOption := &Socks5Option{}
+		err = decoder.Decode(mapping, socksOption)
+		if err != nil {
+			break
+		}
+		proxy = NewSocks5(*socksOption)
+	case "http":
+		httpOption := &HttpOption{}
+		err = decoder.Decode(mapping, httpOption)
+		if err != nil {
+			break
+		}
+		proxy = NewHttp(*httpOption)
+	case "vmess":
+		vmessOption := &VmessOption{
+			HTTPOpts: HTTPOptions{
+				Method: "GET",
+				Path:   []string{"/"},
+			},
+		}
+		err = decoder.Decode(mapping, vmessOption)
+		if err != nil {
+			break
+		}
+		proxy, err = NewVmess(*vmessOption)
+	case "snell":
+		snellOption := &SnellOption{}
+		err = decoder.Decode(mapping, snellOption)
+		if err != nil {
+			break
+		}
+		proxy, err = NewSnell(*snellOption)
+	case "trojan":
+		trojanOption := &TrojanOption{}
+		err = decoder.Decode(mapping, trojanOption)
+		if err != nil {
+			break
+		}
+		proxy, err = NewTrojan(*trojanOption)
+	default:
+		return nil, fmt.Errorf("Unsupport proxy type: %s", proxyType)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	return NewProxy(proxy), nil
+}

adapters/outbound/reject.go

@@ -1,7 +1,8 @@
-package adapters
+package outbound
 
 import (
 	"context"
+	"errors"
 	"io"
 	"net"
 	"time"
@@ -14,7 +15,11 @@ type Reject struct {
 }
 
 func (r *Reject) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	return newConn(&NopConn{}, r), nil
+	return NewConn(&NopConn{}, r), nil
+}
+
+func (r *Reject) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	return nil, errors.New("match reject rule")
 }
 
 func NewReject() *Reject {
@@ -22,6 +27,7 @@ func NewReject() *Reject {
 		Base: &Base{
 			name: "REJECT",
 			tp:   C.Reject,
+			udp:  true,
 		},
 	}
 }

adapters/outbound/selector.go

@@ -1,87 +0,0 @@
-package adapters
-
-import (
-	"context"
-	"encoding/json"
-	"errors"
-	"net"
-
-	C "github.com/Dreamacro/clash/constant"
-)
-
-type Selector struct {
-	*Base
-	selected  C.Proxy
-	proxies   map[string]C.Proxy
-	proxyList []string
-}
-
-type SelectorOption struct {
-	Name    string   `proxy:"name"`
-	Proxies []string `proxy:"proxies"`
-}
-
-func (s *Selector) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := s.selected.DialContext(ctx, metadata)
-	if err == nil {
-		c.AppendToChains(s)
-	}
-	return c, err
-}
-
-func (s *Selector) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	pc, addr, err := s.selected.DialUDP(metadata)
-	if err == nil {
-		pc.AppendToChains(s)
-	}
-	return pc, addr, err
-}
-
-func (s *Selector) SupportUDP() bool {
-	return s.selected.SupportUDP()
-}
-
-func (s *Selector) MarshalJSON() ([]byte, error) {
-	return json.Marshal(map[string]interface{}{
-		"type": s.Type().String(),
-		"now":  s.Now(),
-		"all":  s.proxyList,
-	})
-}
-
-func (s *Selector) Now() string {
-	return s.selected.Name()
-}
-
-func (s *Selector) Set(name string) error {
-	proxy, exist := s.proxies[name]
-	if !exist {
-		return errors.New("Proxy does not exist")
-	}
-	s.selected = proxy
-	return nil
-}
-
-func NewSelector(name string, proxies []C.Proxy) (*Selector, error) {
-	if len(proxies) == 0 {
-		return nil, errors.New("Provide at least one proxy")
-	}
-
-	mapping := make(map[string]C.Proxy)
-	proxyList := make([]string, len(proxies))
-	for idx, proxy := range proxies {
-		mapping[proxy.Name()] = proxy
-		proxyList[idx] = proxy.Name()
-	}
-
-	s := &Selector{
-		Base: &Base{
-			name: name,
-			tp:   C.Selector,
-		},
-		proxies:   mapping,
-		selected:  proxies[0],
-		proxyList: proxyList,
-	}
-	return s, nil
-}

adapters/outbound/shadowsocks.go

@@ -1,14 +1,15 @@
-package adapters
+package outbound
 
 import (
 	"context"
-	"crypto/tls"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net"
 	"strconv"
 
 	"github.com/Dreamacro/clash/common/structure"
+	"github.com/Dreamacro/clash/component/dialer"
 	obfs "github.com/Dreamacro/clash/component/simple-obfs"
 	"github.com/Dreamacro/clash/component/socks5"
 	v2rayObfs "github.com/Dreamacro/clash/component/v2ray-plugin"
@@ -19,7 +20,6 @@ import (
 
 type ShadowSocks struct {
 	*Base
-	server string
 	cipher core.Cipher
 
 	// obfs
@@ -58,48 +58,49 @@ type v2rayObfsOption struct {
 	Mux            bool              `obfs:"mux,omitempty"`
 }
 
-func (ss *ShadowSocks) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := dialContext(ctx, "tcp", ss.server)
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error: %s", ss.server, err.Error())
-	}
-	tcpKeepAlive(c)
+func (ss *ShadowSocks) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
 	switch ss.obfsMode {
 	case "tls":
 		c = obfs.NewTLSObfs(c, ss.obfsOption.Host)
 	case "http":
-		_, port, _ := net.SplitHostPort(ss.server)
+		_, port, _ := net.SplitHostPort(ss.addr)
 		c = obfs.NewHTTPObfs(c, ss.obfsOption.Host, port)
 	case "websocket":
 		var err error
 		c, err = v2rayObfs.NewV2rayObfs(c, ss.v2rayOption)
 		if err != nil {
-			return nil, fmt.Errorf("%s connect error: %s", ss.server, err.Error())
+			return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
 		}
 	}
 	c = ss.cipher.StreamConn(c)
-	_, err = c.Write(serializesSocksAddr(metadata))
-	return newConn(c, ss), err
+	_, err := c.Write(serializesSocksAddr(metadata))
+	return c, err
 }
 
-func (ss *ShadowSocks) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	pc, err := net.ListenPacket("udp", "")
+func (ss *ShadowSocks) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	c, err := dialer.DialContext(ctx, "tcp", ss.addr)
 	if err != nil {
-		return nil, nil, err
+		return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
+	}
+	tcpKeepAlive(c)
+
+	c, err = ss.StreamConn(c, metadata)
+	return NewConn(c, ss), err
+}
+
+func (ss *ShadowSocks) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	pc, err := dialer.ListenPacket("udp", "")
+	if err != nil {
+		return nil, err
 	}
 
-	addr, err := resolveUDPAddr("udp", ss.server)
+	addr, err := resolveUDPAddr("udp", ss.addr)
 	if err != nil {
-		return nil, nil, err
-	}
-
-	targetAddr := socks5.ParseAddr(metadata.RemoteAddress())
-	if targetAddr == nil {
-		return nil, nil, fmt.Errorf("parse address error: %v:%v", metadata.String(), metadata.DstPort)
+		return nil, err
 	}
 
 	pc = ss.cipher.PacketConn(pc)
-	return newPacketConn(&ssUDPConn{PacketConn: pc, rAddr: targetAddr}, ss), addr, nil
+	return newPacketConn(&ssPacketConn{PacketConn: pc, rAddr: addr}, ss), nil
 }
 
 func (ss *ShadowSocks) MarshalJSON() ([]byte, error) {
@@ -109,12 +110,12 @@ func (ss *ShadowSocks) MarshalJSON() ([]byte, error) {
 }
 
 func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
-	server := net.JoinHostPort(option.Server, strconv.Itoa(option.Port))
+	addr := net.JoinHostPort(option.Server, strconv.Itoa(option.Port))
 	cipher := option.Cipher
 	password := option.Password
 	ciph, err := core.PickCipher(cipher, nil, password)
 	if err != nil {
-		return nil, fmt.Errorf("ss %s initialize error: %s", server, err.Error())
+		return nil, fmt.Errorf("ss %s initialize error: %w", addr, err)
 	}
 
 	var v2rayOption *v2rayObfs.Option
@@ -136,49 +137,45 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
 	if option.Plugin == "obfs" {
 		opts := simpleObfsOption{Host: "bing.com"}
 		if err := decoder.Decode(option.PluginOpts, &opts); err != nil {
-			return nil, fmt.Errorf("ss %s initialize obfs error: %s", server, err.Error())
+			return nil, fmt.Errorf("ss %s initialize obfs error: %w", addr, err)
 		}
 
 		if opts.Mode != "tls" && opts.Mode != "http" {
-			return nil, fmt.Errorf("ss %s obfs mode error: %s", server, opts.Mode)
+			return nil, fmt.Errorf("ss %s obfs mode error: %s", addr, opts.Mode)
 		}
 		obfsMode = opts.Mode
 		obfsOption = &opts
 	} else if option.Plugin == "v2ray-plugin" {
 		opts := v2rayObfsOption{Host: "bing.com", Mux: true}
 		if err := decoder.Decode(option.PluginOpts, &opts); err != nil {
-			return nil, fmt.Errorf("ss %s initialize v2ray-plugin error: %s", server, err.Error())
+			return nil, fmt.Errorf("ss %s initialize v2ray-plugin error: %w", addr, err)
 		}
 
 		if opts.Mode != "websocket" {
-			return nil, fmt.Errorf("ss %s obfs mode error: %s", server, opts.Mode)
+			return nil, fmt.Errorf("ss %s obfs mode error: %s", addr, opts.Mode)
 		}
 		obfsMode = opts.Mode
-
-		var tlsConfig *tls.Config
-		if opts.TLS {
-			tlsConfig = &tls.Config{
-				ServerName:         opts.Host,
-				InsecureSkipVerify: opts.SkipCertVerify,
-				ClientSessionCache: getClientSessionCache(),
-			}
-		}
 		v2rayOption = &v2rayObfs.Option{
-			Host:      opts.Host,
-			Path:      opts.Path,
-			Headers:   opts.Headers,
-			TLSConfig: tlsConfig,
-			Mux:       opts.Mux,
+			Host:    opts.Host,
+			Path:    opts.Path,
+			Headers: opts.Headers,
+			Mux:     opts.Mux,
+		}
+
+		if opts.TLS {
+			v2rayOption.TLS = true
+			v2rayOption.SkipCertVerify = opts.SkipCertVerify
+			v2rayOption.SessionCache = getClientSessionCache()
 		}
 	}
 
 	return &ShadowSocks{
 		Base: &Base{
 			name: option.Name,
+			addr: addr,
 			tp:   C.Shadowsocks,
 			udp:  option.UDP,
 		},
-		server: server,
 		cipher: ciph,
 
 		obfsMode:    obfsMode,
@@ -187,22 +184,43 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
 	}, nil
 }
 
-type ssUDPConn struct {
+type ssPacketConn struct {
 	net.PacketConn
-	rAddr socks5.Addr
+	rAddr net.Addr
 }
 
-func (uc *ssUDPConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
-	packet, err := socks5.EncodeUDPPacket(uc.rAddr, b)
+func (spc *ssPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
 	if err != nil {
 		return
 	}
-	return uc.PacketConn.WriteTo(packet[3:], addr)
+	return spc.PacketConn.WriteTo(packet[3:], spc.rAddr)
 }
 
-func (uc *ssUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
-	n, a, e := uc.PacketConn.ReadFrom(b)
-	addr := socks5.SplitAddr(b[:n])
-	copy(b, b[len(addr):])
-	return n - len(addr), a, e
+func (spc *ssPacketConn) WriteWithMetadata(p []byte, metadata *C.Metadata) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(socks5.ParseAddr(metadata.RemoteAddress()), p)
+	if err != nil {
+		return
+	}
+	return spc.PacketConn.WriteTo(packet[3:], spc.rAddr)
+}
+
+func (spc *ssPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, _, e := spc.PacketConn.ReadFrom(b)
+	if e != nil {
+		return 0, nil, e
+	}
+
+	addr := socks5.SplitAddr(b[:n])
+	if addr == nil {
+		return 0, nil, errors.New("parse addr error")
+	}
+
+	udpAddr := addr.UDPAddr()
+	if udpAddr == nil {
+		return 0, nil, errors.New("parse addr error")
+	}
+
+	copy(b, b[len(addr):])
+	return n - len(addr), udpAddr, e
 }

adapters/outbound/snell.go

@@ -1,4 +1,4 @@
-package adapters
+package outbound
 
 import (
 	"context"
@@ -7,6 +7,7 @@ import (
 	"strconv"
 
 	"github.com/Dreamacro/clash/common/structure"
+	"github.com/Dreamacro/clash/component/dialer"
 	obfs "github.com/Dreamacro/clash/component/simple-obfs"
 	"github.com/Dreamacro/clash/component/snell"
 	C "github.com/Dreamacro/clash/constant"
@@ -14,7 +15,6 @@ import (
 
 type Snell struct {
 	*Base
-	server     string
 	psk        []byte
 	obfsOption *simpleObfsOption
 }
@@ -27,45 +27,51 @@ type SnellOption struct {
 	ObfsOpts map[string]interface{} `proxy:"obfs-opts,omitempty"`
 }
 
-func (s *Snell) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := dialContext(ctx, "tcp", s.server)
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error: %s", s.server, err.Error())
-	}
-	tcpKeepAlive(c)
+func (s *Snell) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
 	switch s.obfsOption.Mode {
 	case "tls":
 		c = obfs.NewTLSObfs(c, s.obfsOption.Host)
 	case "http":
-		_, port, _ := net.SplitHostPort(s.server)
+		_, port, _ := net.SplitHostPort(s.addr)
 		c = obfs.NewHTTPObfs(c, s.obfsOption.Host, port)
 	}
 	c = snell.StreamConn(c, s.psk)
 	port, _ := strconv.Atoi(metadata.DstPort)
-	err = snell.WriteHeader(c, metadata.String(), uint(port))
-	return newConn(c, s), err
+	err := snell.WriteHeader(c, metadata.String(), uint(port))
+	return c, err
+}
+
+func (s *Snell) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	c, err := dialer.DialContext(ctx, "tcp", s.addr)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", s.addr, err)
+	}
+	tcpKeepAlive(c)
+
+	c, err = s.StreamConn(c, metadata)
+	return NewConn(c, s), err
 }
 
 func NewSnell(option SnellOption) (*Snell, error) {
-	server := net.JoinHostPort(option.Server, strconv.Itoa(option.Port))
+	addr := net.JoinHostPort(option.Server, strconv.Itoa(option.Port))
 	psk := []byte(option.Psk)
 
 	decoder := structure.NewDecoder(structure.Option{TagName: "obfs", WeaklyTypedInput: true})
 	obfsOption := &simpleObfsOption{Host: "bing.com"}
 	if err := decoder.Decode(option.ObfsOpts, obfsOption); err != nil {
-		return nil, fmt.Errorf("snell %s initialize obfs error: %s", server, err.Error())
+		return nil, fmt.Errorf("snell %s initialize obfs error: %w", addr, err)
 	}
 
 	if obfsOption.Mode != "tls" && obfsOption.Mode != "http" {
-		return nil, fmt.Errorf("snell %s obfs mode error: %s", server, obfsOption.Mode)
+		return nil, fmt.Errorf("snell %s obfs mode error: %s", addr, obfsOption.Mode)
 	}
 
 	return &Snell{
 		Base: &Base{
 			name: option.Name,
+			addr: addr,
 			tp:   C.Snell,
 		},
-		server:     server,
 		psk:        psk,
 		obfsOption: obfsOption,
 	}, nil

adapters/outbound/socks5.go

@@ -1,21 +1,22 @@
-package adapters
+package outbound
 
 import (
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"io"
 	"io/ioutil"
 	"net"
 	"strconv"
 
+	"github.com/Dreamacro/clash/component/dialer"
 	"github.com/Dreamacro/clash/component/socks5"
 	C "github.com/Dreamacro/clash/constant"
 )
 
 type Socks5 struct {
 	*Base
-	addr           string
 	user           string
 	pass           string
 	tls            bool
@@ -34,19 +35,16 @@ type Socks5Option struct {
 	SkipCertVerify bool   `proxy:"skip-cert-verify,omitempty"`
 }
 
-func (ss *Socks5) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := dialContext(ctx, "tcp", ss.addr)
-
-	if err == nil && ss.tls {
+func (ss *Socks5) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
+	if ss.tls {
 		cc := tls.Client(c, ss.tlsConfig)
-		err = cc.Handshake()
+		err := cc.Handshake()
 		c = cc
+		if err != nil {
+			return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
+		}
 	}
 
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error", ss.addr)
-	}
-	tcpKeepAlive(c)
 	var user *socks5.User
 	if ss.user != "" {
 		user = &socks5.User{
@@ -57,15 +55,30 @@ func (ss *Socks5) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn
 	if _, err := socks5.ClientHandshake(c, serializesSocksAddr(metadata), socks5.CmdConnect, user); err != nil {
 		return nil, err
 	}
-	return newConn(c, ss), nil
+	return c, nil
 }
 
-func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, _ net.Addr, err error) {
+func (ss *Socks5) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	c, err := dialer.DialContext(ctx, "tcp", ss.addr)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
+	}
+	tcpKeepAlive(c)
+
+	c, err = ss.StreamConn(c, metadata)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewConn(c, ss), nil
+}
+
+func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, err error) {
 	ctx, cancel := context.WithTimeout(context.Background(), tcpTimeout)
 	defer cancel()
-	c, err := dialContext(ctx, "tcp", ss.addr)
+	c, err := dialer.DialContext(ctx, "tcp", ss.addr)
 	if err != nil {
-		err = fmt.Errorf("%s connect error", ss.addr)
+		err = fmt.Errorf("%s connect error: %w", ss.addr, err)
 		return
 	}
 
@@ -92,21 +105,11 @@ func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, _ net.Addr, err
 
 	bindAddr, err := socks5.ClientHandshake(c, serializesSocksAddr(metadata), socks5.CmdUDPAssociate, user)
 	if err != nil {
-		err = fmt.Errorf("%v client hanshake error", err)
+		err = fmt.Errorf("client hanshake error: %w", err)
 		return
 	}
 
-	addr, err := net.ResolveUDPAddr("udp", bindAddr.String())
-	if err != nil {
-		return
-	}
-
-	targetAddr := socks5.ParseAddr(metadata.RemoteAddress())
-	if targetAddr == nil {
-		return nil, nil, fmt.Errorf("parse address error: %v:%v", metadata.String(), metadata.DstPort)
-	}
-
-	pc, err := net.ListenPacket("udp", "")
+	pc, err := dialer.ListenPacket("udp", "")
 	if err != nil {
 		return
 	}
@@ -119,7 +122,7 @@ func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, _ net.Addr, err
 		pc.Close()
 	}()
 
-	return newPacketConn(&socksUDPConn{PacketConn: pc, rAddr: targetAddr, tcpConn: c}, ss), addr, nil
+	return newPacketConn(&socksPacketConn{PacketConn: pc, rAddr: bindAddr.UDPAddr(), tcpConn: c}, ss), nil
 }
 
 func NewSocks5(option Socks5Option) *Socks5 {
@@ -135,10 +138,10 @@ func NewSocks5(option Socks5Option) *Socks5 {
 	return &Socks5{
 		Base: &Base{
 			name: option.Name,
+			addr: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 			tp:   C.Socks5,
 			udp:  option.UDP,
 		},
-		addr:           net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 		user:           option.UserName,
 		pass:           option.Password,
 		tls:            option.TLS,
@@ -147,22 +150,30 @@ func NewSocks5(option Socks5Option) *Socks5 {
 	}
 }
 
-type socksUDPConn struct {
+type socksPacketConn struct {
 	net.PacketConn
-	rAddr   socks5.Addr
+	rAddr   net.Addr
 	tcpConn net.Conn
 }
 
-func (uc *socksUDPConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
-	packet, err := socks5.EncodeUDPPacket(uc.rAddr, b)
+func (uc *socksPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
 	if err != nil {
 		return
 	}
-	return uc.PacketConn.WriteTo(packet, addr)
+	return uc.PacketConn.WriteTo(packet, uc.rAddr)
 }
 
-func (uc *socksUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
-	n, a, e := uc.PacketConn.ReadFrom(b)
+func (uc *socksPacketConn) WriteWithMetadata(p []byte, metadata *C.Metadata) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(socks5.ParseAddr(metadata.RemoteAddress()), p)
+	if err != nil {
+		return
+	}
+	return uc.PacketConn.WriteTo(packet, uc.rAddr)
+}
+
+func (uc *socksPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, _, e := uc.PacketConn.ReadFrom(b)
 	if e != nil {
 		return 0, nil, e
 	}
@@ -170,13 +181,18 @@ func (uc *socksUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
 	if err != nil {
 		return 0, nil, err
 	}
+
+	udpAddr := addr.UDPAddr()
+	if udpAddr == nil {
+		return 0, nil, errors.New("parse udp addr error")
+	}
+
 	// due to DecodeUDPPacket is mutable, record addr length
-	addrLength := len(addr)
 	copy(b, payload)
-	return n - addrLength - 3, a, nil
+	return n - len(addr) - 3, udpAddr, nil
 }
 
-func (uc *socksUDPConn) Close() error {
+func (uc *socksPacketConn) Close() error {
 	uc.tcpConn.Close()
 	return uc.PacketConn.Close()
 }

adapters/outbound/trojan.go

@@ -0,0 +1,116 @@
+package outbound
+
+import (
+	"context"
+	"encoding/json"
+	"fmt"
+	"net"
+	"strconv"
+
+	"github.com/Dreamacro/clash/component/dialer"
+	"github.com/Dreamacro/clash/component/trojan"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Trojan struct {
+	*Base
+	instance *trojan.Trojan
+}
+
+type TrojanOption struct {
+	Name           string   `proxy:"name"`
+	Server         string   `proxy:"server"`
+	Port           int      `proxy:"port"`
+	Password       string   `proxy:"password"`
+	ALPN           []string `proxy:"alpn,omitempty"`
+	SNI            string   `proxy:"sni,omitempty"`
+	SkipCertVerify bool     `proxy:"skip-cert-verify,omitempty"`
+	UDP            bool     `proxy:"udp,omitempty"`
+}
+
+func (t *Trojan) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
+	c, err := t.instance.StreamConn(c)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", t.addr, err)
+	}
+
+	err = t.instance.WriteHeader(c, trojan.CommandTCP, serializesSocksAddr(metadata))
+	return c, err
+}
+
+func (t *Trojan) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	c, err := dialer.DialContext(ctx, "tcp", t.addr)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", t.addr, err)
+	}
+	tcpKeepAlive(c)
+	c, err = t.StreamConn(c, metadata)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewConn(c, t), err
+}
+
+func (t *Trojan) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), tcpTimeout)
+	defer cancel()
+	c, err := dialer.DialContext(ctx, "tcp", t.addr)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", t.addr, err)
+	}
+	tcpKeepAlive(c)
+	c, err = t.instance.StreamConn(c)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", t.addr, err)
+	}
+
+	err = t.instance.WriteHeader(c, trojan.CommandUDP, serializesSocksAddr(metadata))
+	if err != nil {
+		return nil, err
+	}
+
+	pc := t.instance.PacketConn(c)
+	return newPacketConn(&trojanPacketConn{pc, c}, t), err
+}
+
+func (t *Trojan) MarshalJSON() ([]byte, error) {
+	return json.Marshal(map[string]string{
+		"type": t.Type().String(),
+	})
+}
+
+func NewTrojan(option TrojanOption) (*Trojan, error) {
+	addr := net.JoinHostPort(option.Server, strconv.Itoa(option.Port))
+
+	tOption := &trojan.Option{
+		Password:           option.Password,
+		ALPN:               option.ALPN,
+		ServerName:         option.Server,
+		SkipCertVerify:     option.SkipCertVerify,
+		ClientSessionCache: getClientSessionCache(),
+	}
+
+	if option.SNI != "" {
+		tOption.ServerName = option.SNI
+	}
+
+	return &Trojan{
+		Base: &Base{
+			name: option.Name,
+			addr: addr,
+			tp:   C.Trojan,
+			udp:  option.UDP,
+		},
+		instance: trojan.New(tOption),
+	}, nil
+}
+
+type trojanPacketConn struct {
+	net.PacketConn
+	conn net.Conn
+}
+
+func (tpc *trojanPacketConn) WriteWithMetadata(p []byte, metadata *C.Metadata) (n int, err error) {
+	return trojan.WritePacket(tpc.conn, serializesSocksAddr(metadata), p)
+}

adapters/outbound/urltest.go

@@ -1,159 +0,0 @@
-package adapters
-
-import (
-	"context"
-	"encoding/json"
-	"errors"
-	"net"
-	"sync/atomic"
-	"time"
-
-	"github.com/Dreamacro/clash/common/picker"
-	C "github.com/Dreamacro/clash/constant"
-)
-
-type URLTest struct {
-	*Base
-	proxies  []C.Proxy
-	rawURL   string
-	fast     C.Proxy
-	interval time.Duration
-	done     chan struct{}
-	once     int32
-}
-
-type URLTestOption struct {
-	Name     string   `proxy:"name"`
-	Proxies  []string `proxy:"proxies"`
-	URL      string   `proxy:"url"`
-	Interval int      `proxy:"interval"`
-}
-
-func (u *URLTest) Now() string {
-	return u.fast.Name()
-}
-
-func (u *URLTest) DialContext(ctx context.Context, metadata *C.Metadata) (c C.Conn, err error) {
-	for i := 0; i < 3; i++ {
-		c, err = u.fast.DialContext(ctx, metadata)
-		if err == nil {
-			c.AppendToChains(u)
-			return
-		}
-		u.fallback()
-	}
-	return
-}
-
-func (u *URLTest) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	pc, addr, err := u.fast.DialUDP(metadata)
-	if err == nil {
-		pc.AppendToChains(u)
-	}
-	return pc, addr, err
-}
-
-func (u *URLTest) SupportUDP() bool {
-	return u.fast.SupportUDP()
-}
-
-func (u *URLTest) MarshalJSON() ([]byte, error) {
-	var all []string
-	for _, proxy := range u.proxies {
-		all = append(all, proxy.Name())
-	}
-	return json.Marshal(map[string]interface{}{
-		"type": u.Type().String(),
-		"now":  u.Now(),
-		"all":  all,
-	})
-}
-
-func (u *URLTest) Destroy() {
-	u.done <- struct{}{}
-}
-
-func (u *URLTest) loop() {
-	tick := time.NewTicker(u.interval)
-	go u.speedTest()
-Loop:
-	for {
-		select {
-		case <-tick.C:
-			go u.speedTest()
-		case <-u.done:
-			break Loop
-		}
-	}
-}
-
-func (u *URLTest) fallback() {
-	fast := u.proxies[0]
-	min := fast.LastDelay()
-	for _, proxy := range u.proxies[1:] {
-		if !proxy.Alive() {
-			continue
-		}
-
-		delay := proxy.LastDelay()
-		if delay < min {
-			fast = proxy
-			min = delay
-		}
-	}
-	u.fast = fast
-}
-
-func (u *URLTest) speedTest() {
-	if !atomic.CompareAndSwapInt32(&u.once, 0, 1) {
-		return
-	}
-	defer atomic.StoreInt32(&u.once, 0)
-
-	ctx, cancel := context.WithTimeout(context.Background(), defaultURLTestTimeout)
-	defer cancel()
-	picker := picker.WithoutAutoCancel(ctx)
-	for _, p := range u.proxies {
-		proxy := p
-		picker.Go(func() (interface{}, error) {
-			_, err := proxy.URLTest(ctx, u.rawURL)
-			if err != nil {
-				return nil, err
-			}
-			return proxy, nil
-		})
-	}
-
-	fast := picker.WaitWithoutCancel()
-	if fast != nil {
-		u.fast = fast.(C.Proxy)
-	}
-
-	picker.Wait()
-}
-
-func NewURLTest(option URLTestOption, proxies []C.Proxy) (*URLTest, error) {
-	_, err := urlToMetadata(option.URL)
-	if err != nil {
-		return nil, err
-	}
-	if len(proxies) < 1 {
-		return nil, errors.New("The number of proxies cannot be 0")
-	}
-
-	interval := time.Duration(option.Interval) * time.Second
-	urlTest := &URLTest{
-		Base: &Base{
-			name: option.Name,
-			tp:   C.URLTest,
-		},
-		proxies:  proxies[:],
-		rawURL:   option.URL,
-		fast:     proxies[0],
-		interval: interval,
-		done:     make(chan struct{}),
-		once:     0,
-	}
-	go urlTest.loop()
-	return urlTest, nil
-}

adapters/outbound/util.go

@@ -1,8 +1,7 @@
-package adapters
+package outbound
 
 import (
 	"bytes"
-	"context"
 	"crypto/tls"
 	"fmt"
 	"net"
@@ -11,9 +10,9 @@ import (
 	"sync"
 	"time"
 
+	"github.com/Dreamacro/clash/component/resolver"
 	"github.com/Dreamacro/clash/component/socks5"
 	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/clash/dns"
 )
 
 const (
@@ -33,11 +32,12 @@ func urlToMetadata(rawURL string) (addr C.Metadata, err error) {
 
 	port := u.Port()
 	if port == "" {
-		if u.Scheme == "https" {
+		switch u.Scheme {
+		case "https":
 			port = "443"
-		} else if u.Scheme == "http" {
+		case "http":
 			port = "80"
-		} else {
+		default:
 			err = fmt.Errorf("%s scheme not Support", rawURL)
 			return
 		}
@@ -86,93 +86,13 @@ func serializesSocksAddr(metadata *C.Metadata) []byte {
 	return bytes.Join(buf, nil)
 }
 
-func dialContext(ctx context.Context, network, address string) (net.Conn, error) {
-	host, port, err := net.SplitHostPort(address)
-	if err != nil {
-		return nil, err
-	}
-
-	dialer := net.Dialer{}
-
-	returned := make(chan struct{})
-	defer close(returned)
-
-	type dialResult struct {
-		net.Conn
-		error
-		resolved bool
-		ipv6     bool
-		done     bool
-	}
-	results := make(chan dialResult)
-	var primary, fallback dialResult
-
-	startRacer := func(ctx context.Context, host string, ipv6 bool) {
-		result := dialResult{ipv6: ipv6, done: true}
-		defer func() {
-			select {
-			case results <- result:
-			case <-returned:
-				if result.Conn != nil {
-					result.Conn.Close()
-				}
-			}
-		}()
-
-		var ip net.IP
-		if ipv6 {
-			ip, result.error = dns.ResolveIPv6(host)
-		} else {
-			ip, result.error = dns.ResolveIPv4(host)
-		}
-		if result.error != nil {
-			return
-		}
-		result.resolved = true
-
-		if ipv6 {
-			result.Conn, result.error = dialer.DialContext(ctx, "tcp6", net.JoinHostPort(ip.String(), port))
-		} else {
-			result.Conn, result.error = dialer.DialContext(ctx, "tcp4", net.JoinHostPort(ip.String(), port))
-		}
-	}
-
-	go startRacer(ctx, host, false)
-	go startRacer(ctx, host, true)
-
-	for {
-		select {
-		case res := <-results:
-			if res.error == nil {
-				return res.Conn, nil
-			}
-
-			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 {
-					return nil, primary.error
-				}
-			}
-		}
-	}
-}
-
 func resolveUDPAddr(network, address string) (*net.UDPAddr, error) {
 	host, port, err := net.SplitHostPort(address)
 	if err != nil {
 		return nil, err
 	}
 
-	ip, err := dns.ResolveIP(host)
+	ip, err := resolver.ResolveIP(host)
 	if err != nil {
 		return nil, err
 	}

adapters/outbound/vmess.go

@@ -1,20 +1,24 @@
-package adapters
+package outbound
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"net"
+	"net/http"
 	"strconv"
 	"strings"
 
+	"github.com/Dreamacro/clash/component/dialer"
+	"github.com/Dreamacro/clash/component/resolver"
 	"github.com/Dreamacro/clash/component/vmess"
 	C "github.com/Dreamacro/clash/constant"
 )
 
 type Vmess struct {
 	*Base
-	server string
 	client *vmess.Client
+	option *VmessOption
 }
 
 type VmessOption struct {
@@ -27,50 +31,116 @@ type VmessOption struct {
 	TLS            bool              `proxy:"tls,omitempty"`
 	UDP            bool              `proxy:"udp,omitempty"`
 	Network        string            `proxy:"network,omitempty"`
+	HTTPOpts       HTTPOptions       `proxy:"http-opts,omitempty"`
 	WSPath         string            `proxy:"ws-path,omitempty"`
 	WSHeaders      map[string]string `proxy:"ws-headers,omitempty"`
 	SkipCertVerify bool              `proxy:"skip-cert-verify,omitempty"`
 }
 
-func (v *Vmess) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := dialContext(ctx, "tcp", v.server)
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error", v.server)
-	}
-	tcpKeepAlive(c)
-	c, err = v.client.New(c, parseVmessAddr(metadata))
-	return newConn(c, v), err
+type HTTPOptions struct {
+	Method  string              `proxy:"method,omitempty"`
+	Path    []string            `proxy:"path,omitempty"`
+	Headers map[string][]string `proxy:"headers,omitempty"`
 }
 
-func (v *Vmess) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	ctx, cancel := context.WithTimeout(context.Background(), tcpTimeout)
-	defer cancel()
-	c, err := dialContext(ctx, "tcp", v.server)
+func (v *Vmess) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
+	var err error
+	switch v.option.Network {
+	case "ws":
+		host, port, _ := net.SplitHostPort(v.addr)
+		wsOpts := &vmess.WebsocketConfig{
+			Host: host,
+			Port: port,
+			Path: v.option.WSPath,
+		}
+
+		if len(v.option.WSHeaders) != 0 {
+			header := http.Header{}
+			for key, value := range v.option.WSHeaders {
+				header.Add(key, value)
+			}
+			wsOpts.Headers = header
+		}
+
+		if v.option.TLS {
+			wsOpts.TLS = true
+			wsOpts.SessionCache = getClientSessionCache()
+			wsOpts.SkipCertVerify = v.option.SkipCertVerify
+		}
+		c, err = vmess.StreamWebsocketConn(c, wsOpts)
+	case "http":
+		host, _, _ := net.SplitHostPort(v.addr)
+		httpOpts := &vmess.HTTPConfig{
+			Host:    host,
+			Method:  v.option.HTTPOpts.Method,
+			Path:    v.option.HTTPOpts.Path,
+			Headers: v.option.HTTPOpts.Headers,
+		}
+
+		c = vmess.StreamHTTPConn(c, httpOpts)
+	default:
+		// handle TLS
+		if v.option.TLS {
+			host, _, _ := net.SplitHostPort(v.addr)
+			tlsOpts := &vmess.TLSConfig{
+				Host:           host,
+				SkipCertVerify: v.option.SkipCertVerify,
+				SessionCache:   getClientSessionCache(),
+			}
+			c, err = vmess.StreamTLSConn(c, tlsOpts)
+		}
+	}
+
 	if err != nil {
-		return nil, nil, fmt.Errorf("%s connect error", v.server)
+		return nil, err
+	}
+
+	return v.client.StreamConn(c, parseVmessAddr(metadata))
+}
+
+func (v *Vmess) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	c, err := dialer.DialContext(ctx, "tcp", v.addr)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error", v.addr)
 	}
 	tcpKeepAlive(c)
-	c, err = v.client.New(c, parseVmessAddr(metadata))
-	if err != nil {
-		return nil, nil, fmt.Errorf("new vmess client error: %v", err)
+
+	c, err = v.StreamConn(c, metadata)
+	return NewConn(c, v), err
+}
+
+func (v *Vmess) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	// vmess use stream-oriented udp, so clash needs a net.UDPAddr
+	if !metadata.Resolved() {
+		ip, err := resolver.ResolveIP(metadata.Host)
+		if err != nil {
+			return nil, errors.New("can't resolve ip")
+		}
+		metadata.DstIP = ip
 	}
-	return newPacketConn(&vmessUDPConn{Conn: c}, v), c.RemoteAddr(), nil
+
+	ctx, cancel := context.WithTimeout(context.Background(), tcpTimeout)
+	defer cancel()
+	c, err := dialer.DialContext(ctx, "tcp", v.addr)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error", v.addr)
+	}
+	tcpKeepAlive(c)
+	c, err = v.StreamConn(c, metadata)
+	if err != nil {
+		return nil, fmt.Errorf("new vmess client error: %v", err)
+	}
+	return newPacketConn(&vmessPacketConn{Conn: c, rAddr: metadata.UDPAddr()}, v), nil
 }
 
 func NewVmess(option VmessOption) (*Vmess, error) {
 	security := strings.ToLower(option.Cipher)
 	client, err := vmess.NewClient(vmess.Config{
-		UUID:             option.UUID,
-		AlterID:          uint16(option.AlterID),
-		Security:         security,
-		TLS:              option.TLS,
-		HostName:         option.Server,
-		Port:             strconv.Itoa(option.Port),
-		NetWork:          option.Network,
-		WebSocketPath:    option.WSPath,
-		WebSocketHeaders: option.WSHeaders,
-		SkipCertVerify:   option.SkipCertVerify,
-		SessionCache:     getClientSessionCache(),
+		UUID:     option.UUID,
+		AlterID:  uint16(option.AlterID),
+		Security: security,
+		HostName: option.Server,
+		Port:     strconv.Itoa(option.Port),
 	})
 	if err != nil {
 		return nil, err
@@ -79,11 +149,12 @@ func NewVmess(option VmessOption) (*Vmess, error) {
 	return &Vmess{
 		Base: &Base{
 			name: option.Name,
+			addr: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 			tp:   C.Vmess,
 			udp:  true,
 		},
-		server: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 		client: client,
+		option: &option,
 	}, nil
 }
 
@@ -115,15 +186,20 @@ func parseVmessAddr(metadata *C.Metadata) *vmess.DstAddr {
 	}
 }
 
-type vmessUDPConn struct {
+type vmessPacketConn struct {
 	net.Conn
+	rAddr net.Addr
 }
 
-func (uc *vmessUDPConn) WriteTo(b []byte, addr net.Addr) (int, error) {
+func (uc *vmessPacketConn) WriteTo(b []byte, addr net.Addr) (int, error) {
 	return uc.Conn.Write(b)
 }
 
-func (uc *vmessUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
-	n, err := uc.Conn.Read(b)
-	return n, uc.RemoteAddr(), err
+func (uc *vmessPacketConn) WriteWithMetadata(p []byte, metadata *C.Metadata) (n int, err error) {
+	return uc.Conn.Write(p)
+}
+
+func (uc *vmessPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, err := uc.Conn.Read(b)
+	return n, uc.rAddr, err
 }

adapters/outboundgroup/common.go

@@ -0,0 +1,20 @@
+package outboundgroup
+
+import (
+	"time"
+
+	"github.com/Dreamacro/clash/adapters/provider"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+const (
+	defaultGetProxiesDuration = time.Second * 5
+)
+
+func getProvidersProxies(providers []provider.ProxyProvider) []C.Proxy {
+	proxies := []C.Proxy{}
+	for _, provider := range providers {
+		proxies = append(proxies, provider.Proxies()...)
+	}
+	return proxies
+}

adapters/outboundgroup/fallback.go

@@ -0,0 +1,89 @@
+package outboundgroup
+
+import (
+	"context"
+	"encoding/json"
+
+	"github.com/Dreamacro/clash/adapters/outbound"
+	"github.com/Dreamacro/clash/adapters/provider"
+	"github.com/Dreamacro/clash/common/singledo"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Fallback struct {
+	*outbound.Base
+	single    *singledo.Single
+	providers []provider.ProxyProvider
+}
+
+func (f *Fallback) Now() string {
+	proxy := f.findAliveProxy()
+	return proxy.Name()
+}
+
+func (f *Fallback) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	proxy := f.findAliveProxy()
+	c, err := proxy.DialContext(ctx, metadata)
+	if err == nil {
+		c.AppendToChains(f)
+	}
+	return c, err
+}
+
+func (f *Fallback) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	proxy := f.findAliveProxy()
+	pc, err := proxy.DialUDP(metadata)
+	if err == nil {
+		pc.AppendToChains(f)
+	}
+	return pc, err
+}
+
+func (f *Fallback) SupportUDP() bool {
+	proxy := f.findAliveProxy()
+	return proxy.SupportUDP()
+}
+
+func (f *Fallback) MarshalJSON() ([]byte, error) {
+	var all []string
+	for _, proxy := range f.proxies() {
+		all = append(all, proxy.Name())
+	}
+	return json.Marshal(map[string]interface{}{
+		"type": f.Type().String(),
+		"now":  f.Now(),
+		"all":  all,
+	})
+}
+
+func (f *Fallback) Unwrap(metadata *C.Metadata) C.Proxy {
+	proxy := f.findAliveProxy()
+	return proxy
+}
+
+func (f *Fallback) proxies() []C.Proxy {
+	elm, _, _ := f.single.Do(func() (interface{}, error) {
+		return getProvidersProxies(f.providers), nil
+	})
+
+	return elm.([]C.Proxy)
+}
+
+func (f *Fallback) findAliveProxy() C.Proxy {
+	proxies := f.proxies()
+	for _, proxy := range proxies {
+		if proxy.Alive() {
+			return proxy
+		}
+	}
+
+	return f.proxies()[0]
+}
+
+func NewFallback(name string, providers []provider.ProxyProvider) *Fallback {
+	return &Fallback{
+		Base:      outbound.NewBase(name, "", C.Fallback, false),
+		single:    singledo.NewSingle(defaultGetProxiesDuration),
+		providers: providers,
+	}
+}

adapters/outboundgroup/loadbalance.go

@@ -0,0 +1,125 @@
+package outboundgroup
+
+import (
+	"context"
+	"encoding/json"
+	"net"
+
+	"github.com/Dreamacro/clash/adapters/outbound"
+	"github.com/Dreamacro/clash/adapters/provider"
+	"github.com/Dreamacro/clash/common/murmur3"
+	"github.com/Dreamacro/clash/common/singledo"
+	C "github.com/Dreamacro/clash/constant"
+
+	"golang.org/x/net/publicsuffix"
+)
+
+type LoadBalance struct {
+	*outbound.Base
+	single    *singledo.Single
+	maxRetry  int
+	providers []provider.ProxyProvider
+}
+
+func getKey(metadata *C.Metadata) string {
+	if metadata.Host != "" {
+		// ip host
+		if ip := net.ParseIP(metadata.Host); ip != nil {
+			return metadata.Host
+		}
+
+		if etld, err := publicsuffix.EffectiveTLDPlusOne(metadata.Host); err == nil {
+			return etld
+		}
+	}
+
+	if metadata.DstIP == nil {
+		return ""
+	}
+
+	return metadata.DstIP.String()
+}
+
+func jumpHash(key uint64, buckets int32) int32 {
+	var b, j int64
+
+	for j < int64(buckets) {
+		b = j
+		key = key*2862933555777941757 + 1
+		j = int64(float64(b+1) * (float64(int64(1)<<31) / float64((key>>33)+1)))
+	}
+
+	return int32(b)
+}
+
+func (lb *LoadBalance) DialContext(ctx context.Context, metadata *C.Metadata) (c C.Conn, err error) {
+	defer func() {
+		if err == nil {
+			c.AppendToChains(lb)
+		}
+	}()
+
+	proxy := lb.Unwrap(metadata)
+
+	c, err = proxy.DialContext(ctx, metadata)
+	return
+}
+
+func (lb *LoadBalance) DialUDP(metadata *C.Metadata) (pc C.PacketConn, err error) {
+	defer func() {
+		if err == nil {
+			pc.AppendToChains(lb)
+		}
+	}()
+
+	proxy := lb.Unwrap(metadata)
+
+	return proxy.DialUDP(metadata)
+}
+
+func (lb *LoadBalance) SupportUDP() bool {
+	return true
+}
+
+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]
+}
+
+func (lb *LoadBalance) proxies() []C.Proxy {
+	elm, _, _ := lb.single.Do(func() (interface{}, error) {
+		return getProvidersProxies(lb.providers), nil
+	})
+
+	return elm.([]C.Proxy)
+}
+
+func (lb *LoadBalance) MarshalJSON() ([]byte, error) {
+	var all []string
+	for _, proxy := range lb.proxies() {
+		all = append(all, proxy.Name())
+	}
+	return json.Marshal(map[string]interface{}{
+		"type": lb.Type().String(),
+		"all":  all,
+	})
+}
+
+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,
+	}
+}

adapters/outboundgroup/parser.go

@@ -0,0 +1,146 @@
+package outboundgroup
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/Dreamacro/clash/adapters/provider"
+	"github.com/Dreamacro/clash/common/structure"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+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"`
+}
+
+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{}
+	if err := decoder.Decode(config, groupOption); err != nil {
+		return nil, errFormat
+	}
+
+	if groupOption.Type == "" || groupOption.Name == "" {
+		return nil, errFormat
+	}
+
+	groupName := groupOption.Name
+
+	providers := []provider.ProxyProvider{}
+
+	if len(groupOption.Proxies) == 0 && len(groupOption.Use) == 0 {
+		return nil, errMissProxy
+	}
+
+	if len(groupOption.Proxies) != 0 {
+		ps, err := getProxies(proxyMap, groupOption.Proxies)
+		if err != nil {
+			return nil, err
+		}
+
+		// if Use not empty, drop health check options
+		if len(groupOption.Use) != 0 {
+			hc := provider.NewHealthCheck(ps, "", 0)
+			pd, err := provider.NewCompatibleProvider(groupName, ps, hc)
+			if err != nil {
+				return nil, err
+			}
+
+			providers = append(providers, pd)
+		} else {
+			// select don't need health check
+			if groupOption.Type == "select" || groupOption.Type == "relay" {
+				hc := provider.NewHealthCheck(ps, "", 0)
+				pd, err := provider.NewCompatibleProvider(groupName, ps, hc)
+				if err != nil {
+					return nil, err
+				}
+
+				providers = append(providers, pd)
+				providersMap[groupName] = pd
+			} else {
+				if groupOption.URL == "" || groupOption.Interval == 0 {
+					return nil, errMissHealthCheck
+				}
+
+				hc := provider.NewHealthCheck(ps, groupOption.URL, uint(groupOption.Interval))
+				pd, err := provider.NewCompatibleProvider(groupName, ps, hc)
+				if err != nil {
+					return nil, err
+				}
+
+				providers = append(providers, pd)
+				providersMap[groupName] = pd
+			}
+		}
+	}
+
+	if len(groupOption.Use) != 0 {
+		list, err := getProviders(providersMap, groupOption.Use)
+		if err != nil {
+			return nil, err
+		}
+		providers = append(providers, list...)
+	}
+
+	var group C.ProxyAdapter
+	switch groupOption.Type {
+	case "url-test":
+		group = NewURLTest(groupName, providers)
+	case "select":
+		group = NewSelector(groupName, providers)
+	case "fallback":
+		group = NewFallback(groupName, providers)
+	case "load-balance":
+		group = NewLoadBalance(groupName, providers)
+	case "relay":
+		group = NewRelay(groupName, providers)
+	default:
+		return nil, fmt.Errorf("%w: %s", errType, groupOption.Type)
+	}
+
+	return group, nil
+}
+
+func getProxies(mapping map[string]C.Proxy, list []string) ([]C.Proxy, error) {
+	var ps []C.Proxy
+	for _, name := range list {
+		p, ok := mapping[name]
+		if !ok {
+			return nil, fmt.Errorf("'%s' not found", name)
+		}
+		ps = append(ps, p)
+	}
+	return ps, nil
+}
+
+func getProviders(mapping map[string]provider.ProxyProvider, list []string) ([]provider.ProxyProvider, error) {
+	var ps []provider.ProxyProvider
+	for _, name := range list {
+		p, ok := mapping[name]
+		if !ok {
+			return nil, fmt.Errorf("'%s' not found", name)
+		}
+
+		if p.VehicleType() == provider.Compatible {
+			return nil, fmt.Errorf("proxy group %s can't contains in `use`", name)
+		}
+		ps = append(ps, p)
+	}
+	return ps, nil
+}

adapters/outboundgroup/relay.go

@@ -0,0 +1,98 @@
+package outboundgroup
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"fmt"
+
+	"github.com/Dreamacro/clash/adapters/outbound"
+	"github.com/Dreamacro/clash/adapters/provider"
+	"github.com/Dreamacro/clash/common/singledo"
+	"github.com/Dreamacro/clash/component/dialer"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Relay struct {
+	*outbound.Base
+	single    *singledo.Single
+	providers []provider.ProxyProvider
+}
+
+func (r *Relay) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	proxies := r.proxies(metadata)
+	if len(proxies) == 0 {
+		return nil, errors.New("Proxy does not exist")
+	}
+	first := proxies[0]
+	last := proxies[len(proxies)-1]
+
+	c, err := dialer.DialContext(ctx, "tcp", first.Addr())
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", first.Addr(), err)
+	}
+	tcpKeepAlive(c)
+
+	var currentMeta *C.Metadata
+	for _, proxy := range proxies[1:] {
+		currentMeta, err = addrToMetadata(proxy.Addr())
+		if err != nil {
+			return nil, err
+		}
+
+		c, err = first.StreamConn(c, currentMeta)
+		if err != nil {
+			return nil, fmt.Errorf("%s connect error: %w", first.Addr(), err)
+		}
+
+		first = proxy
+	}
+
+	c, err = last.StreamConn(c, metadata)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", last.Addr(), err)
+	}
+
+	return outbound.NewConn(c, r), nil
+}
+
+func (r *Relay) MarshalJSON() ([]byte, error) {
+	var all []string
+	for _, proxy := range r.rawProxies() {
+		all = append(all, proxy.Name())
+	}
+	return json.Marshal(map[string]interface{}{
+		"type": r.Type().String(),
+		"all":  all,
+	})
+}
+
+func (r *Relay) rawProxies() []C.Proxy {
+	elm, _, _ := r.single.Do(func() (interface{}, error) {
+		return getProvidersProxies(r.providers), nil
+	})
+
+	return elm.([]C.Proxy)
+}
+
+func (r *Relay) proxies(metadata *C.Metadata) []C.Proxy {
+	proxies := r.rawProxies()
+
+	for n, proxy := range proxies {
+		subproxy := proxy.Unwrap(metadata)
+		for subproxy != nil {
+			proxies[n] = subproxy
+			subproxy = subproxy.Unwrap(metadata)
+		}
+	}
+
+	return proxies
+}
+
+func NewRelay(name string, providers []provider.ProxyProvider) *Relay {
+	return &Relay{
+		Base:      outbound.NewBase(name, "", C.Relay, false),
+		single:    singledo.NewSingle(defaultGetProxiesDuration),
+		providers: providers,
+	}
+}

adapters/outboundgroup/selector.go

@@ -0,0 +1,97 @@
+package outboundgroup
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+
+	"github.com/Dreamacro/clash/adapters/outbound"
+	"github.com/Dreamacro/clash/adapters/provider"
+	"github.com/Dreamacro/clash/common/singledo"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Selector struct {
+	*outbound.Base
+	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)
+	if err == nil {
+		c.AppendToChains(s)
+	}
+	return c, err
+}
+
+func (s *Selector) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	pc, err := s.selectedProxy().DialUDP(metadata)
+	if err == nil {
+		pc.AppendToChains(s)
+	}
+	return pc, err
+}
+
+func (s *Selector) SupportUDP() bool {
+	return s.selectedProxy().SupportUDP()
+}
+
+func (s *Selector) MarshalJSON() ([]byte, error) {
+	var all []string
+	for _, proxy := range getProvidersProxies(s.providers) {
+		all = append(all, proxy.Name())
+	}
+
+	return json.Marshal(map[string]interface{}{
+		"type": s.Type().String(),
+		"now":  s.Now(),
+		"all":  all,
+	})
+}
+
+func (s *Selector) Now() string {
+	return s.selectedProxy().Name()
+}
+
+func (s *Selector) Set(name string) error {
+	for _, proxy := range getProvidersProxies(s.providers) {
+		if proxy.Name() == name {
+			s.selected = name
+			s.single.Reset()
+			return nil
+		}
+	}
+
+	return errors.New("Proxy does not exist")
+}
+
+func (s *Selector) Unwrap(metadata *C.Metadata) C.Proxy {
+	return s.selectedProxy()
+}
+
+func (s *Selector) selectedProxy() C.Proxy {
+	elm, _, _ := s.single.Do(func() (interface{}, error) {
+		proxies := getProvidersProxies(s.providers)
+		for _, proxy := range proxies {
+			if proxy.Name() == s.selected {
+				return proxy, nil
+			}
+		}
+
+		return proxies[0], nil
+	})
+
+	return elm.(C.Proxy)
+}
+
+func NewSelector(name string, 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,
+	}
+}

adapters/outboundgroup/urltest.go

@@ -0,0 +1,98 @@
+package outboundgroup
+
+import (
+	"context"
+	"encoding/json"
+	"time"
+
+	"github.com/Dreamacro/clash/adapters/outbound"
+	"github.com/Dreamacro/clash/adapters/provider"
+	"github.com/Dreamacro/clash/common/singledo"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type URLTest struct {
+	*outbound.Base
+	single     *singledo.Single
+	fastSingle *singledo.Single
+	providers  []provider.ProxyProvider
+}
+
+func (u *URLTest) Now() string {
+	return u.fast().Name()
+}
+
+func (u *URLTest) DialContext(ctx context.Context, metadata *C.Metadata) (c C.Conn, err error) {
+	c, err = u.fast().DialContext(ctx, metadata)
+	if err == nil {
+		c.AppendToChains(u)
+	}
+	return c, err
+}
+
+func (u *URLTest) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	pc, err := u.fast().DialUDP(metadata)
+	if err == nil {
+		pc.AppendToChains(u)
+	}
+	return pc, err
+}
+
+func (u *URLTest) Unwrap(metadata *C.Metadata) C.Proxy {
+	return u.fast()
+}
+
+func (u *URLTest) proxies() []C.Proxy {
+	elm, _, _ := u.single.Do(func() (interface{}, error) {
+		return getProvidersProxies(u.providers), nil
+	})
+
+	return elm.([]C.Proxy)
+}
+
+func (u *URLTest) fast() C.Proxy {
+	elm, _, _ := u.fastSingle.Do(func() (interface{}, error) {
+		proxies := u.proxies()
+		fast := proxies[0]
+		min := fast.LastDelay()
+		for _, proxy := range proxies[1:] {
+			if !proxy.Alive() {
+				continue
+			}
+
+			delay := proxy.LastDelay()
+			if delay < min {
+				fast = proxy
+				min = delay
+			}
+		}
+		return fast, nil
+	})
+
+	return elm.(C.Proxy)
+}
+
+func (u *URLTest) SupportUDP() bool {
+	return u.fast().SupportUDP()
+}
+
+func (u *URLTest) MarshalJSON() ([]byte, error) {
+	var all []string
+	for _, proxy := range u.proxies() {
+		all = append(all, proxy.Name())
+	}
+	return json.Marshal(map[string]interface{}{
+		"type": u.Type().String(),
+		"now":  u.Now(),
+		"all":  all,
+	})
+}
+
+func NewURLTest(name string, providers []provider.ProxyProvider) *URLTest {
+	return &URLTest{
+		Base:       outbound.NewBase(name, "", C.URLTest, false),
+		single:     singledo.NewSingle(defaultGetProxiesDuration),
+		fastSingle: singledo.NewSingle(time.Second * 10),
+		providers:  providers,
+	}
+}

adapters/outboundgroup/util.go

@@ -0,0 +1,53 @@
+package outboundgroup
+
+import (
+	"fmt"
+	"net"
+	"time"
+
+	C "github.com/Dreamacro/clash/constant"
+)
+
+func addrToMetadata(rawAddress string) (addr *C.Metadata, err error) {
+	host, port, err := net.SplitHostPort(rawAddress)
+	if err != nil {
+		err = fmt.Errorf("addrToMetadata failed: %w", err)
+		return
+	}
+
+	ip := net.ParseIP(host)
+	if ip != nil {
+		if ip.To4() != nil {
+			addr = &C.Metadata{
+				AddrType: C.AtypIPv4,
+				Host:     "",
+				DstIP:    ip,
+				DstPort:  port,
+			}
+			return
+		} else {
+			addr = &C.Metadata{
+				AddrType: C.AtypIPv6,
+				Host:     "",
+				DstIP:    ip,
+				DstPort:  port,
+			}
+			return
+		}
+	} else {
+		addr = &C.Metadata{
+			AddrType: C.AtypDomainName,
+			Host:     host,
+			DstIP:    nil,
+			DstPort:  port,
+		}
+		return
+	}
+}
+
+func tcpKeepAlive(c net.Conn) {
+	if tcp, ok := c.(*net.TCPConn); ok {
+		tcp.SetKeepAlive(true)
+		tcp.SetKeepAlivePeriod(30 * time.Second)
+	}
+}

adapters/provider/fetcher.go

@@ -0,0 +1,154 @@
+package provider
+
+import (
+	"bytes"
+	"crypto/md5"
+	"io/ioutil"
+	"os"
+	"time"
+
+	"github.com/Dreamacro/clash/log"
+)
+
+var (
+	fileMode os.FileMode = 0666
+)
+
+type parser = func([]byte) (interface{}, error)
+
+type fetcher struct {
+	name      string
+	vehicle   Vehicle
+	updatedAt *time.Time
+	ticker    *time.Ticker
+	hash      [16]byte
+	parser    parser
+	onUpdate  func(interface{})
+}
+
+func (f *fetcher) Name() string {
+	return f.name
+}
+
+func (f *fetcher) VehicleType() VehicleType {
+	return f.vehicle.Type()
+}
+
+func (f *fetcher) Initial() (interface{}, error) {
+	var buf []byte
+	var err error
+	var isLocal bool
+	if stat, err := os.Stat(f.vehicle.Path()); err == nil {
+		buf, err = ioutil.ReadFile(f.vehicle.Path())
+		modTime := stat.ModTime()
+		f.updatedAt = &modTime
+		isLocal = true
+	} else {
+		buf, err = f.vehicle.Read()
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	proxies, err := f.parser(buf)
+	if err != nil {
+		if !isLocal {
+			return nil, err
+		}
+
+		// parse local file error, fallback to remote
+		buf, err = f.vehicle.Read()
+		if err != nil {
+			return nil, err
+		}
+
+		proxies, err = f.parser(buf)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if err := ioutil.WriteFile(f.vehicle.Path(), buf, fileMode); err != nil {
+		return nil, err
+	}
+
+	f.hash = md5.Sum(buf)
+
+	// pull proxies automatically
+	if f.ticker != nil {
+		go f.pullLoop()
+	}
+
+	return proxies, nil
+}
+
+func (f *fetcher) Update() (interface{}, bool, error) {
+	buf, err := f.vehicle.Read()
+	if err != nil {
+		return nil, false, err
+	}
+
+	now := time.Now()
+	hash := md5.Sum(buf)
+	if bytes.Equal(f.hash[:], hash[:]) {
+		f.updatedAt = &now
+		return nil, true, nil
+	}
+
+	proxies, err := f.parser(buf)
+	if err != nil {
+		return nil, false, err
+	}
+
+	if err := ioutil.WriteFile(f.vehicle.Path(), buf, fileMode); err != nil {
+		return nil, false, err
+	}
+
+	f.updatedAt = &now
+	f.hash = hash
+
+	return proxies, false, nil
+}
+
+func (f *fetcher) Destroy() error {
+	if f.ticker != nil {
+		f.ticker.Stop()
+	}
+	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
+		}
+
+		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)
+		}
+	}
+}
+
+func newFetcher(name string, interval time.Duration, vehicle Vehicle, parser parser, onUpdate func(interface{})) *fetcher {
+	var ticker *time.Ticker
+	if interval != 0 {
+		ticker = time.NewTicker(interval)
+	}
+
+	return &fetcher{
+		name:     name,
+		ticker:   ticker,
+		vehicle:  vehicle,
+		parser:   parser,
+		onUpdate: onUpdate,
+	}
+}

adapters/provider/healthcheck.go

@@ -0,0 +1,70 @@
+package provider
+
+import (
+	"context"
+	"time"
+
+	C "github.com/Dreamacro/clash/constant"
+)
+
+const (
+	defaultURLTestTimeout = time.Second * 5
+)
+
+type HealthCheckOption struct {
+	URL      string
+	Interval uint
+}
+
+type HealthCheck struct {
+	url      string
+	proxies  []C.Proxy
+	interval uint
+	done     chan struct{}
+}
+
+func (hc *HealthCheck) process() {
+	ticker := time.NewTicker(time.Duration(hc.interval) * time.Second)
+
+	go hc.check()
+	for {
+		select {
+		case <-ticker.C:
+			hc.check()
+		case <-hc.done:
+			ticker.Stop()
+			return
+		}
+	}
+}
+
+func (hc *HealthCheck) setProxy(proxies []C.Proxy) {
+	hc.proxies = proxies
+}
+
+func (hc *HealthCheck) auto() bool {
+	return hc.interval != 0
+}
+
+func (hc *HealthCheck) check() {
+	ctx, cancel := context.WithTimeout(context.Background(), defaultURLTestTimeout)
+	for _, proxy := range hc.proxies {
+		go proxy.URLTest(ctx, hc.url)
+	}
+
+	<-ctx.Done()
+	cancel()
+}
+
+func (hc *HealthCheck) close() {
+	hc.done <- struct{}{}
+}
+
+func NewHealthCheck(proxies []C.Proxy, url string, interval uint) *HealthCheck {
+	return &HealthCheck{
+		proxies:  proxies,
+		url:      url,
+		interval: interval,
+		done:     make(chan struct{}, 1),
+	}
+}

adapters/provider/parser.go

@@ -0,0 +1,58 @@
+package provider
+
+import (
+	"errors"
+	"fmt"
+	"time"
+
+	"github.com/Dreamacro/clash/common/structure"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+var (
+	errVehicleType = errors.New("unsupport vehicle type")
+)
+
+type healthCheckSchema struct {
+	Enable   bool   `provider:"enable"`
+	URL      string `provider:"url"`
+	Interval int    `provider:"interval"`
+}
+
+type proxyProviderSchema struct {
+	Type        string            `provider:"type"`
+	Path        string            `provider:"path"`
+	URL         string            `provider:"url,omitempty"`
+	Interval    int               `provider:"interval,omitempty"`
+	HealthCheck healthCheckSchema `provider:"health-check,omitempty"`
+}
+
+func ParseProxyProvider(name string, mapping map[string]interface{}) (ProxyProvider, error) {
+	decoder := structure.NewDecoder(structure.Option{TagName: "provider", WeaklyTypedInput: true})
+
+	schema := &proxyProviderSchema{}
+	if err := decoder.Decode(mapping, schema); err != nil {
+		return nil, err
+	}
+
+	var hcInterval uint = 0
+	if schema.HealthCheck.Enable {
+		hcInterval = uint(schema.HealthCheck.Interval)
+	}
+	hc := NewHealthCheck([]C.Proxy{}, schema.HealthCheck.URL, hcInterval)
+
+	path := C.Path.Resolve(schema.Path)
+
+	var vehicle Vehicle
+	switch schema.Type {
+	case "file":
+		vehicle = NewFileVehicle(path)
+	case "http":
+		vehicle = NewHTTPVehicle(schema.URL, path)
+	default:
+		return nil, fmt.Errorf("%w: %s", errVehicleType, schema.Type)
+	}
+
+	interval := time.Duration(uint(schema.Interval)) * time.Second
+	return NewProxySetProvider(name, interval, vehicle, hc), nil
+}

adapters/provider/provider.go

@@ -0,0 +1,246 @@
+package provider
+
+import (
+	"encoding/json"
+	"errors"
+	"fmt"
+	"runtime"
+	"time"
+
+	"github.com/Dreamacro/clash/adapters/outbound"
+	C "github.com/Dreamacro/clash/constant"
+
+	"gopkg.in/yaml.v2"
+)
+
+const (
+	ReservedName = "default"
+)
+
+// Provider Type
+const (
+	Proxy ProviderType = iota
+	Rule
+)
+
+// ProviderType defined
+type ProviderType int
+
+func (pt ProviderType) String() string {
+	switch pt {
+	case Proxy:
+		return "Proxy"
+	case Rule:
+		return "Rule"
+	default:
+		return "Unknown"
+	}
+}
+
+// Provider interface
+type Provider interface {
+	Name() string
+	VehicleType() VehicleType
+	Type() ProviderType
+	Initial() error
+	Update() error
+}
+
+// ProxyProvider interface
+type ProxyProvider interface {
+	Provider
+	Proxies() []C.Proxy
+	HealthCheck()
+}
+
+type ProxySchema struct {
+	Proxies []map[string]interface{} `yaml:"proxies"`
+}
+
+// for auto gc
+type ProxySetProvider struct {
+	*proxySetProvider
+}
+
+type proxySetProvider struct {
+	*fetcher
+	proxies     []C.Proxy
+	healthCheck *HealthCheck
+}
+
+func (pp *proxySetProvider) MarshalJSON() ([]byte, error) {
+	return json.Marshal(map[string]interface{}{
+		"name":        pp.Name(),
+		"type":        pp.Type().String(),
+		"vehicleType": pp.VehicleType().String(),
+		"proxies":     pp.Proxies(),
+		"updatedAt":   pp.updatedAt,
+	})
+}
+
+func (pp *proxySetProvider) Name() string {
+	return pp.name
+}
+
+func (pp *proxySetProvider) HealthCheck() {
+	pp.healthCheck.check()
+}
+
+func (pp *proxySetProvider) Update() error {
+	elm, same, err := pp.fetcher.Update()
+	if err == nil && !same {
+		pp.onUpdate(elm)
+	}
+	return err
+}
+
+func (pp *proxySetProvider) Initial() error {
+	elm, err := pp.fetcher.Initial()
+	if err != nil {
+		return err
+	}
+
+	pp.onUpdate(elm)
+	return nil
+}
+
+func (pp *proxySetProvider) Type() ProviderType {
+	return Proxy
+}
+
+func (pp *proxySetProvider) Proxies() []C.Proxy {
+	return pp.proxies
+}
+
+func proxiesParse(buf []byte) (interface{}, error) {
+	schema := &ProxySchema{}
+
+	if err := yaml.Unmarshal(buf, schema); err != nil {
+		return nil, err
+	}
+
+	if schema.Proxies == nil {
+		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)
+		}
+		proxies = append(proxies, proxy)
+	}
+
+	if len(proxies) == 0 {
+		return nil, errors.New("File doesn't have any valid proxy")
+	}
+
+	return proxies, nil
+}
+
+func (pp *proxySetProvider) setProxies(proxies []C.Proxy) {
+	pp.proxies = proxies
+	pp.healthCheck.setProxy(proxies)
+	go pp.healthCheck.check()
+}
+
+func stopProxyProvider(pd *ProxySetProvider) {
+	pd.healthCheck.close()
+	pd.fetcher.Destroy()
+}
+
+func NewProxySetProvider(name string, interval time.Duration, vehicle Vehicle, hc *HealthCheck) *ProxySetProvider {
+	if hc.auto() {
+		go hc.process()
+	}
+
+	pd := &proxySetProvider{
+		proxies:     []C.Proxy{},
+		healthCheck: hc,
+	}
+
+	onUpdate := func(elm interface{}) {
+		ret := elm.([]C.Proxy)
+		pd.setProxies(ret)
+	}
+
+	fetcher := newFetcher(name, interval, vehicle, proxiesParse, onUpdate)
+	pd.fetcher = fetcher
+
+	wrapper := &ProxySetProvider{pd}
+	runtime.SetFinalizer(wrapper, stopProxyProvider)
+	return wrapper
+}
+
+// for auto gc
+type CompatibleProvider struct {
+	*compatibleProvider
+}
+
+type compatibleProvider struct {
+	name        string
+	healthCheck *HealthCheck
+	proxies     []C.Proxy
+}
+
+func (cp *compatibleProvider) MarshalJSON() ([]byte, error) {
+	return json.Marshal(map[string]interface{}{
+		"name":        cp.Name(),
+		"type":        cp.Type().String(),
+		"vehicleType": cp.VehicleType().String(),
+		"proxies":     cp.Proxies(),
+	})
+}
+
+func (cp *compatibleProvider) Name() string {
+	return cp.name
+}
+
+func (cp *compatibleProvider) HealthCheck() {
+	cp.healthCheck.check()
+}
+
+func (cp *compatibleProvider) Update() error {
+	return nil
+}
+
+func (cp *compatibleProvider) Initial() error {
+	return nil
+}
+
+func (cp *compatibleProvider) VehicleType() VehicleType {
+	return Compatible
+}
+
+func (cp *compatibleProvider) Type() ProviderType {
+	return Proxy
+}
+
+func (cp *compatibleProvider) Proxies() []C.Proxy {
+	return cp.proxies
+}
+
+func stopCompatibleProvider(pd *CompatibleProvider) {
+	pd.healthCheck.close()
+}
+
+func NewCompatibleProvider(name string, proxies []C.Proxy, hc *HealthCheck) (*CompatibleProvider, error) {
+	if len(proxies) == 0 {
+		return nil, errors.New("Provider need one proxy at least")
+	}
+
+	if hc.auto() {
+		go hc.process()
+	}
+
+	pd := &compatibleProvider{
+		name:        name,
+		proxies:     proxies,
+		healthCheck: hc,
+	}
+
+	wrapper := &CompatibleProvider{pd}
+	runtime.SetFinalizer(wrapper, stopCompatibleProvider)
+	return wrapper, nil
+}

adapters/provider/vehicle.go

@@ -0,0 +1,121 @@
+package provider
+
+import (
+	"context"
+	"io/ioutil"
+	"net/http"
+	"net/url"
+	"time"
+
+	"github.com/Dreamacro/clash/component/dialer"
+)
+
+// Vehicle Type
+const (
+	File VehicleType = iota
+	HTTP
+	Compatible
+)
+
+// VehicleType defined
+type VehicleType int
+
+func (v VehicleType) String() string {
+	switch v {
+	case File:
+		return "File"
+	case HTTP:
+		return "HTTP"
+	case Compatible:
+		return "Compatible"
+	default:
+		return "Unknown"
+	}
+}
+
+type Vehicle interface {
+	Read() ([]byte, error)
+	Path() string
+	Type() VehicleType
+}
+
+type FileVehicle struct {
+	path string
+}
+
+func (f *FileVehicle) Type() VehicleType {
+	return File
+}
+
+func (f *FileVehicle) Path() string {
+	return f.path
+}
+
+func (f *FileVehicle) Read() ([]byte, error) {
+	return ioutil.ReadFile(f.path)
+}
+
+func NewFileVehicle(path string) *FileVehicle {
+	return &FileVehicle{path: path}
+}
+
+type HTTPVehicle struct {
+	url  string
+	path string
+}
+
+func (h *HTTPVehicle) Type() VehicleType {
+	return HTTP
+}
+
+func (h *HTTPVehicle) Path() string {
+	return h.path
+}
+
+func (h *HTTPVehicle) Read() ([]byte, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*20)
+	defer cancel()
+
+	uri, err := url.Parse(h.url)
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequest(http.MethodGet, uri.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	if user := uri.User; user != nil {
+		password, _ := user.Password()
+		req.SetBasicAuth(user.Username(), password)
+	}
+
+	req = req.WithContext(ctx)
+
+	transport := &http.Transport{
+		// from http.DefaultTransport
+		MaxIdleConns:          100,
+		IdleConnTimeout:       90 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 1 * time.Second,
+		DialContext:           dialer.DialContext,
+	}
+
+	client := http.Client{Transport: transport}
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+
+	buf, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+
+	return buf, nil
+}
+
+func NewHTTPVehicle(url string, path string) *HTTPVehicle {
+	return &HTTPVehicle{url, path}
+}

common/cache/lrucache.go

@@ -11,6 +11,16 @@ import (
 // Option is part of Functional Options Pattern
 type Option func(*LruCache)
 
+// EvictCallback is used to get a callback when a cache entry is evicted
+type EvictCallback = func(key interface{}, value interface{})
+
+// WithEvict set the evict callback
+func WithEvict(cb EvictCallback) Option {
+	return func(l *LruCache) {
+		l.onEvict = cb
+	}
+}
+
 // WithUpdateAgeOnGet update expires when Get element
 func WithUpdateAgeOnGet() Option {
 	return func(l *LruCache) {
@@ -32,6 +42,14 @@ func WithSize(maxSize int) Option {
 	}
 }
 
+// WithStale decide whether Stale return is enabled.
+// If this feature is enabled, element will not get Evicted according to `WithAge`.
+func WithStale(stale bool) Option {
+	return func(l *LruCache) {
+		l.staleReturn = stale
+	}
+}
+
 // LruCache is a thread-safe, in-memory lru-cache that evicts the
 // least recently used entries from memory when (if set) the entries are
 // older than maxAge (in seconds).  Use the New constructor to create one.
@@ -42,6 +60,8 @@ type LruCache struct {
 	cache          map[interface{}]*list.Element
 	lru            *list.List // Front is least-recent
 	updateAgeOnGet bool
+	staleReturn    bool
+	onEvict        EvictCallback
 }
 
 // NewLRUCache creates an LruCache
@@ -61,31 +81,28 @@ func NewLRUCache(options ...Option) *LruCache {
 // Get returns the interface{} representation of a cached response and a bool
 // set to true if the key was found.
 func (c *LruCache) Get(key interface{}) (interface{}, bool) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
-	le, ok := c.cache[key]
-	if !ok {
+	entry := c.get(key)
+	if entry == nil {
 		return nil, false
 	}
-
-	if c.maxAge > 0 && le.Value.(*entry).expires <= time.Now().Unix() {
-		c.deleteElement(le)
-		c.maybeDeleteOldest()
-
-		return nil, false
-	}
-
-	c.lru.MoveToBack(le)
-	entry := le.Value.(*entry)
-	if c.maxAge > 0 && c.updateAgeOnGet {
-		entry.expires = time.Now().Unix() + c.maxAge
-	}
 	value := entry.value
 
 	return value, true
 }
 
+// GetWithExpire returns the interface{} representation of a cached response,
+// a time.Time Give expected expires,
+// and a bool set to true if the key was found.
+// This method will NOT check the maxAge of element and will NOT update the expires.
+func (c *LruCache) GetWithExpire(key interface{}) (interface{}, time.Time, bool) {
+	entry := c.get(key)
+	if entry == nil {
+		return nil, time.Time{}, false
+	}
+
+	return entry.value, time.Unix(entry.expires, 0), true
+}
+
 // Exist returns if key exist in cache but not put item to the head of linked list
 func (c *LruCache) Exist(key interface{}) bool {
 	c.mu.Lock()
@@ -97,21 +114,26 @@ func (c *LruCache) Exist(key interface{}) bool {
 
 // Set stores the interface{} representation of a response for a given key.
 func (c *LruCache) Set(key interface{}, value interface{}) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
 	expires := int64(0)
 	if c.maxAge > 0 {
 		expires = time.Now().Unix() + c.maxAge
 	}
+	c.SetWithExpire(key, value, time.Unix(expires, 0))
+}
+
+// SetWithExpire stores the interface{} representation of a response for a given key and given exires.
+// The expires time will round to second.
+func (c *LruCache) SetWithExpire(key interface{}, value interface{}, expires time.Time) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
 
 	if le, ok := c.cache[key]; ok {
 		c.lru.MoveToBack(le)
 		e := le.Value.(*entry)
 		e.value = value
-		e.expires = expires
+		e.expires = expires.Unix()
 	} else {
-		e := &entry{key: key, value: value, expires: expires}
+		e := &entry{key: key, value: value, expires: expires.Unix()}
 		c.cache[key] = c.lru.PushBack(e)
 
 		if c.maxSize > 0 {
@@ -124,6 +146,30 @@ func (c *LruCache) Set(key interface{}, value interface{}) {
 	c.maybeDeleteOldest()
 }
 
+func (c *LruCache) get(key interface{}) *entry {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	le, ok := c.cache[key]
+	if !ok {
+		return nil
+	}
+
+	if !c.staleReturn && c.maxAge > 0 && le.Value.(*entry).expires <= time.Now().Unix() {
+		c.deleteElement(le)
+		c.maybeDeleteOldest()
+
+		return nil
+	}
+
+	c.lru.MoveToBack(le)
+	entry := le.Value.(*entry)
+	if c.maxAge > 0 && c.updateAgeOnGet {
+		entry.expires = time.Now().Unix() + c.maxAge
+	}
+	return entry
+}
+
 // Delete removes the value associated with a key.
 func (c *LruCache) Delete(key string) {
 	c.mu.Lock()
@@ -136,7 +182,7 @@ func (c *LruCache) Delete(key string) {
 }
 
 func (c *LruCache) maybeDeleteOldest() {
-	if c.maxAge > 0 {
+	if !c.staleReturn && c.maxAge > 0 {
 		now := time.Now().Unix()
 		for le := c.lru.Front(); le != nil && le.Value.(*entry).expires <= now; le = c.lru.Front() {
 			c.deleteElement(le)
@@ -148,6 +194,9 @@ func (c *LruCache) deleteElement(le *list.Element) {
 	c.lru.Remove(le)
 	e := le.Value.(*entry)
 	delete(c.cache, e.key)
+	if c.onEvict != nil {
+		c.onEvict(e.key, e.value)
+	}
 }
 
 type entry struct {

common/cache/lrucache_test.go

@@ -115,3 +115,52 @@ func TestMaxSize(t *testing.T) {
 	_, ok = c.Get("foo")
 	assert.False(t, ok)
 }
+
+func TestExist(t *testing.T) {
+	c := NewLRUCache(WithSize(1))
+	c.Set(1, 2)
+	assert.True(t, c.Exist(1))
+	c.Set(2, 3)
+	assert.False(t, c.Exist(1))
+}
+
+func TestEvict(t *testing.T) {
+	temp := 0
+	evict := func(key interface{}, value interface{}) {
+		temp = key.(int) + value.(int)
+	}
+
+	c := NewLRUCache(WithEvict(evict), WithSize(1))
+	c.Set(1, 2)
+	c.Set(2, 3)
+
+	assert.Equal(t, temp, 3)
+}
+
+func TestSetWithExpire(t *testing.T) {
+	c := NewLRUCache(WithAge(1))
+	now := time.Now().Unix()
+
+	tenSecBefore := time.Unix(now-10, 0)
+	c.SetWithExpire(1, 2, tenSecBefore)
+
+	// res is expected not to exist, and expires should be empty time.Time
+	res, expires, exist := c.GetWithExpire(1)
+	assert.Equal(t, nil, res)
+	assert.Equal(t, time.Time{}, expires)
+	assert.Equal(t, false, exist)
+
+}
+
+func TestStale(t *testing.T) {
+	c := NewLRUCache(WithAge(1), WithStale(true))
+	now := time.Now().Unix()
+
+	tenSecBefore := time.Unix(now-10, 0)
+	c.SetWithExpire(1, 2, tenSecBefore)
+
+	res, expires, exist := c.GetWithExpire(1)
+	assert.Equal(t, 2, res)
+	assert.Equal(t, tenSecBefore, expires)
+	assert.Equal(t, true, exist)
+}

common/observable/observable.go

@@ -7,60 +7,58 @@ import (
 
 type Observable struct {
 	iterable Iterable
-	listener *sync.Map
+	listener map[Subscription]*Subscriber
+	mux      sync.Mutex
 	done     bool
-	doneLock sync.RWMutex
 }
 
 func (o *Observable) process() {
 	for item := range o.iterable {
-		o.listener.Range(func(key, value interface{}) bool {
-			elm := value.(*Subscriber)
-			elm.Emit(item)
-			return true
-		})
+		o.mux.Lock()
+		for _, sub := range o.listener {
+			sub.Emit(item)
+		}
+		o.mux.Unlock()
 	}
 	o.close()
 }
 
 func (o *Observable) close() {
-	o.doneLock.Lock()
-	o.done = true
-	o.doneLock.Unlock()
+	o.mux.Lock()
+	defer o.mux.Unlock()
 
-	o.listener.Range(func(key, value interface{}) bool {
-		elm := value.(*Subscriber)
-		elm.Close()
-		return true
-	})
+	o.done = true
+	for _, sub := range o.listener {
+		sub.Close()
+	}
 }
 
 func (o *Observable) Subscribe() (Subscription, error) {
-	o.doneLock.RLock()
-	done := o.done
-	o.doneLock.RUnlock()
-	if done == true {
+	o.mux.Lock()
+	defer o.mux.Unlock()
+	if o.done {
 		return nil, errors.New("Observable is closed")
 	}
 	subscriber := newSubscriber()
-	o.listener.Store(subscriber.Out(), subscriber)
+	o.listener[subscriber.Out()] = subscriber
 	return subscriber.Out(), nil
 }
 
 func (o *Observable) UnSubscribe(sub Subscription) {
-	elm, exist := o.listener.Load(sub)
+	o.mux.Lock()
+	defer o.mux.Unlock()
+	subscriber, exist := o.listener[sub]
 	if !exist {
 		return
 	}
-	subscriber := elm.(*Subscriber)
-	o.listener.Delete(subscriber.Out())
+	delete(o.listener, sub)
 	subscriber.Close()
 }
 
 func NewObservable(any Iterable) *Observable {
 	observable := &Observable{
 		iterable: any,
-		listener: &sync.Map{},
+		listener: map[Subscription]*Subscriber{},
 	}
 	go observable.process()
 	return observable

common/observable/observable_test.go

@@ -5,6 +5,8 @@ import (
 	"sync"
 	"testing"
 	"time"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func iterator(item []interface{}) chan interface{} {
@@ -23,16 +25,12 @@ func TestObservable(t *testing.T) {
 	iter := iterator([]interface{}{1, 2, 3, 4, 5})
 	src := NewObservable(iter)
 	data, err := src.Subscribe()
-	if err != nil {
-		t.Error(err)
-	}
+	assert.Nil(t, err)
 	count := 0
 	for range data {
-		count = count + 1
-	}
-	if count != 5 {
-		t.Error("Revc number error")
+		count++
 	}
+	assert.Equal(t, count, 5)
 }
 
 func TestObservable_MutilSubscribe(t *testing.T) {
@@ -46,30 +44,24 @@ func TestObservable_MutilSubscribe(t *testing.T) {
 	wg.Add(2)
 	waitCh := func(ch <-chan interface{}) {
 		for range ch {
-			count = count + 1
+			count++
 		}
 		wg.Done()
 	}
 	go waitCh(ch1)
 	go waitCh(ch2)
 	wg.Wait()
-	if count != 10 {
-		t.Error("Revc number error")
-	}
+	assert.Equal(t, count, 10)
 }
 
 func TestObservable_UnSubscribe(t *testing.T) {
 	iter := iterator([]interface{}{1, 2, 3, 4, 5})
 	src := NewObservable(iter)
 	data, err := src.Subscribe()
-	if err != nil {
-		t.Error(err)
-	}
+	assert.Nil(t, err)
 	src.UnSubscribe(data)
 	_, open := <-data
-	if open {
-		t.Error("Revc number error")
-	}
+	assert.False(t, open)
 }
 
 func TestObservable_SubscribeClosedSource(t *testing.T) {
@@ -79,9 +71,7 @@ func TestObservable_SubscribeClosedSource(t *testing.T) {
 	<-data
 
 	_, closed := src.Subscribe()
-	if closed == nil {
-		t.Error("Observable should be closed")
-	}
+	assert.NotNil(t, closed)
 }
 
 func TestObservable_UnSubscribeWithNotExistSubscription(t *testing.T) {
@@ -118,7 +108,5 @@ func TestObservable_SubscribeGoroutineLeak(t *testing.T) {
 	}
 	wg.Wait()
 	now := runtime.NumGoroutine()
-	if init != now {
-		t.Errorf("Goroutine Leak: init %d now %d", init, now)
-	}
+	assert.Equal(t, init, now)
 }

common/picker/picker.go

@@ -15,17 +15,16 @@ type Picker struct {
 
 	wg sync.WaitGroup
 
-	once   sync.Once
-	result interface{}
-
-	firstDone chan struct{}
+	once    sync.Once
+	errOnce sync.Once
+	result  interface{}
+	err     error
 }
 
 func newPicker(ctx context.Context, cancel func()) *Picker {
 	return &Picker{
-		ctx:       ctx,
-		cancel:    cancel,
-		firstDone: make(chan struct{}, 1),
+		ctx:    ctx,
+		cancel: cancel,
 	}
 }
 
@@ -42,12 +41,6 @@ func WithTimeout(ctx context.Context, timeout time.Duration) (*Picker, context.C
 	return newPicker(ctx, cancel), ctx
 }
 
-// WithoutAutoCancel returns a new Picker and an associated Context derived from ctx,
-// but it wouldn't cancel context when the first element return.
-func WithoutAutoCancel(ctx context.Context) *Picker {
-	return newPicker(ctx, nil)
-}
-
 // Wait blocks until all function calls from the Go method have returned,
 // then returns the first nil error result (if any) from them.
 func (p *Picker) Wait() interface{} {
@@ -58,14 +51,9 @@ func (p *Picker) Wait() interface{} {
 	return p.result
 }
 
-// WaitWithoutCancel blocks until the first result return, if timeout will return nil.
-func (p *Picker) WaitWithoutCancel() interface{} {
-	select {
-	case <-p.firstDone:
-		return p.result
-	case <-p.ctx.Done():
-		return p.result
-	}
+// Error return the first error (if all success return nil)
+func (p *Picker) Error() error {
+	return p.err
 }
 
 // Go calls the given function in a new goroutine.
@@ -79,11 +67,14 @@ func (p *Picker) Go(f func() (interface{}, error)) {
 		if ret, err := f(); err == nil {
 			p.once.Do(func() {
 				p.result = ret
-				p.firstDone <- struct{}{}
 				if p.cancel != nil {
 					p.cancel()
 				}
 			})
+		} else {
+			p.errOnce.Do(func() {
+				p.err = err
+			})
 		}
 	}()
 }

common/picker/picker_test.go

@@ -36,31 +36,5 @@ func TestPicker_Timeout(t *testing.T) {
 
 	number := picker.Wait()
 	assert.Nil(t, number)
-}
-
-func TestPicker_WaitWithoutAutoCancel(t *testing.T) {
-	ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond*60)
-	defer cancel()
-	picker := WithoutAutoCancel(ctx)
-
-	trigger := false
-	picker.Go(sleepAndSend(ctx, 10, 1))
-	picker.Go(func() (interface{}, error) {
-		timer := time.NewTimer(time.Millisecond * time.Duration(30))
-		select {
-		case <-timer.C:
-			trigger = true
-			return 2, nil
-		case <-ctx.Done():
-			return nil, ctx.Err()
-		}
-	})
-	elm := picker.WaitWithoutCancel()
-
-	assert.NotNil(t, elm)
-	assert.Equal(t, elm.(int), 1)
-
-	elm = picker.Wait()
-	assert.True(t, trigger)
-	assert.Equal(t, elm.(int), 1)
+	assert.NotNil(t, picker.Error())
 }

common/pool/alloc.go

@@ -0,0 +1,65 @@
+package pool
+
+// Inspired by https://github.com/xtaci/smux/blob/master/alloc.go
+
+import (
+	"errors"
+	"math/bits"
+	"sync"
+)
+
+var defaultAllocator *Allocator
+
+func init() {
+	defaultAllocator = NewAllocator()
+}
+
+// Allocator for incoming frames, optimized to prevent overwriting after zeroing
+type Allocator struct {
+	buffers []sync.Pool
+}
+
+// NewAllocator initiates a []byte allocator for frames less than 65536 bytes,
+// the waste(memory fragmentation) of space allocation is guaranteed to be
+// no more than 50%.
+func NewAllocator() *Allocator {
+	alloc := new(Allocator)
+	alloc.buffers = make([]sync.Pool, 17) // 1B -> 64K
+	for k := range alloc.buffers {
+		i := k
+		alloc.buffers[k].New = func() interface{} {
+			return make([]byte, 1<<uint32(i))
+		}
+	}
+	return alloc
+}
+
+// Get a []byte from pool with most appropriate cap
+func (alloc *Allocator) Get(size int) []byte {
+	if size <= 0 || size > 65536 {
+		return nil
+	}
+
+	bits := msb(size)
+	if size == 1<<bits {
+		return alloc.buffers[bits].Get().([]byte)[:size]
+	}
+
+	return alloc.buffers[bits+1].Get().([]byte)[:size]
+}
+
+// Put returns a []byte to pool for future use,
+// which the cap must be exactly 2^n
+func (alloc *Allocator) Put(buf []byte) error {
+	bits := msb(cap(buf))
+	if cap(buf) == 0 || cap(buf) > 65536 || cap(buf) != 1<<bits {
+		return errors.New("allocator Put() incorrect buffer size")
+	}
+	alloc.buffers[bits].Put(buf)
+	return nil
+}
+
+// msb return the pos of most significiant bit
+func msb(size int) uint16 {
+	return uint16(bits.Len32(uint32(size)) - 1)
+}

common/pool/alloc_test.go

@@ -0,0 +1,48 @@
+package pool
+
+import (
+	"math/rand"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestAllocGet(t *testing.T) {
+	alloc := NewAllocator()
+	assert.Nil(t, alloc.Get(0))
+	assert.Equal(t, 1, len(alloc.Get(1)))
+	assert.Equal(t, 2, len(alloc.Get(2)))
+	assert.Equal(t, 3, len(alloc.Get(3)))
+	assert.Equal(t, 4, cap(alloc.Get(3)))
+	assert.Equal(t, 4, cap(alloc.Get(4)))
+	assert.Equal(t, 1023, len(alloc.Get(1023)))
+	assert.Equal(t, 1024, cap(alloc.Get(1023)))
+	assert.Equal(t, 1024, len(alloc.Get(1024)))
+	assert.Equal(t, 65536, len(alloc.Get(65536)))
+	assert.Nil(t, alloc.Get(65537))
+}
+
+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.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")
+}
+
+func TestAllocPutThenGet(t *testing.T) {
+	alloc := NewAllocator()
+	data := alloc.Get(4)
+	alloc.Put(data)
+	newData := alloc.Get(4)
+
+	assert.Equal(t, cap(data), cap(newData), "different cap while alloc.Get()")
+}
+
+func BenchmarkMSB(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		msb(rand.Int())
+	}
+}

common/pool/pool.go

@@ -1,15 +1,16 @@
 package pool
 
-import (
-	"sync"
-)
-
 const (
 	// io.Copy default buffer size is 32 KiB
 	// but the maximum packet size of vmess/shadowsocks is about 16 KiB
 	// so define a buffer of 20 KiB to reduce the memory of each TCP relay
-	bufferSize = 20 * 1024
+	RelayBufferSize = 20 * 1024
 )
 
-// BufPool provide buffer for relay
-var BufPool = sync.Pool{New: func() interface{} { return make([]byte, bufferSize) }}
+func Get(size int) []byte {
+	return defaultAllocator.Get(size)
+}
+
+func Put(buf []byte) error {
+	return defaultAllocator.Put(buf)
+}

common/singledo/singledo.go

@@ -0,0 +1,59 @@
+package singledo
+
+import (
+	"sync"
+	"time"
+)
+
+type call struct {
+	wg  sync.WaitGroup
+	val interface{}
+	err error
+}
+
+type Single struct {
+	mux    sync.Mutex
+	last   time.Time
+	wait   time.Duration
+	call   *call
+	result *Result
+}
+
+type Result struct {
+	Val interface{}
+	Err error
+}
+
+func (s *Single) Do(fn func() (interface{}, error)) (v interface{}, err error, shared bool) {
+	s.mux.Lock()
+	now := time.Now()
+	if now.Before(s.last.Add(s.wait)) {
+		s.mux.Unlock()
+		return s.result.Val, s.result.Err, true
+	}
+
+	if call := s.call; call != nil {
+		s.mux.Unlock()
+		call.wg.Wait()
+		return call.val, call.err, true
+	}
+
+	call := &call{}
+	call.wg.Add(1)
+	s.call = call
+	s.mux.Unlock()
+	call.val, call.err = fn()
+	call.wg.Done()
+	s.call = nil
+	s.result = &Result{call.val, call.err}
+	s.last = now
+	return call.val, call.err, false
+}
+
+func (s *Single) Reset() {
+	s.last = time.Time{}
+}
+
+func NewSingle(wait time.Duration) *Single {
+	return &Single{wait: wait}
+}

common/singledo/singledo_test.go

@@ -0,0 +1,68 @@
+package singledo
+
+import (
+	"sync"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestBasic(t *testing.T) {
+	single := NewSingle(time.Millisecond * 30)
+	foo := 0
+	shardCount := 0
+	call := func() (interface{}, error) {
+		foo++
+		time.Sleep(time.Millisecond * 5)
+		return nil, nil
+	}
+
+	var wg sync.WaitGroup
+	const n = 5
+	wg.Add(n)
+	for i := 0; i < n; i++ {
+		go func() {
+			_, _, shard := single.Do(call)
+			if shard {
+				shardCount++
+			}
+			wg.Done()
+		}()
+	}
+
+	wg.Wait()
+	assert.Equal(t, 1, foo)
+	assert.Equal(t, 4, shardCount)
+}
+
+func TestTimer(t *testing.T) {
+	single := NewSingle(time.Millisecond * 30)
+	foo := 0
+	call := func() (interface{}, error) {
+		foo++
+		return nil, nil
+	}
+
+	single.Do(call)
+	time.Sleep(10 * time.Millisecond)
+	_, _, shard := single.Do(call)
+
+	assert.Equal(t, 1, foo)
+	assert.True(t, shard)
+}
+
+func TestReset(t *testing.T) {
+	single := NewSingle(time.Millisecond * 30)
+	foo := 0
+	call := func() (interface{}, error) {
+		foo++
+		return nil, nil
+	}
+
+	single.Do(call)
+	single.Reset()
+	single.Do(call)
+
+	assert.Equal(t, 2, foo)
+}

common/sockopt/reuseaddr_linux.go

@@ -0,0 +1,19 @@
+package sockopt
+
+import (
+	"net"
+	"syscall"
+)
+
+func UDPReuseaddr(c *net.UDPConn) (err error) {
+	rc, err := c.SyscallConn()
+	if err != nil {
+		return
+	}
+
+	rc.Control(func(fd uintptr) {
+		err = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
+	})
+
+	return
+}

common/sockopt/reuseaddr_other.go

@@ -0,0 +1,11 @@
+// +build !linux
+
+package sockopt
+
+import (
+	"net"
+)
+
+func UDPReuseaddr(c *net.UDPConn) (err error) {
+	return
+}

common/structure/structure.go

@@ -76,6 +76,8 @@ func (d *Decoder) decode(name string, data interface{}, val reflect.Value) error
 		return d.decodeMap(name, data, val)
 	case reflect.Interface:
 		return d.setInterface(name, data, val)
+	case reflect.Struct:
+		return d.decodeStruct(name, data, val)
 	default:
 		return fmt.Errorf("type %s not support", val.Kind().String())
 	}
@@ -214,6 +216,11 @@ func (d *Decoder) decodeMapFromMap(name string, dataVal reflect.Value, val refle
 		}
 
 		v := dataVal.MapIndex(k).Interface()
+		if v == nil {
+			errors = append(errors, fmt.Sprintf("filed %s invalid", fieldName))
+			continue
+		}
+
 		currentVal := reflect.Indirect(reflect.New(valElemType))
 		if err := d.decode(fieldName, v, currentVal); err != nil {
 			errors = append(errors, err.Error())
@@ -232,6 +239,159 @@ func (d *Decoder) decodeMapFromMap(name string, dataVal reflect.Value, val refle
 	return nil
 }
 
+func (d *Decoder) decodeStruct(name string, data interface{}, val reflect.Value) error {
+	dataVal := reflect.Indirect(reflect.ValueOf(data))
+
+	// If the type of the value to write to and the data match directly,
+	// then we just set it directly instead of recursing into the structure.
+	if dataVal.Type() == val.Type() {
+		val.Set(dataVal)
+		return nil
+	}
+
+	dataValKind := dataVal.Kind()
+	switch dataValKind {
+	case reflect.Map:
+		return d.decodeStructFromMap(name, dataVal, val)
+	default:
+		return fmt.Errorf("'%s' expected a map, got '%s'", name, dataVal.Kind())
+	}
+}
+
+func (d *Decoder) decodeStructFromMap(name string, dataVal, val reflect.Value) error {
+	dataValType := dataVal.Type()
+	if kind := dataValType.Key().Kind(); kind != reflect.String && kind != reflect.Interface {
+		return fmt.Errorf(
+			"'%s' needs a map with string keys, has '%s' keys",
+			name, dataValType.Key().Kind())
+	}
+
+	dataValKeys := make(map[reflect.Value]struct{})
+	dataValKeysUnused := make(map[interface{}]struct{})
+	for _, dataValKey := range dataVal.MapKeys() {
+		dataValKeys[dataValKey] = struct{}{}
+		dataValKeysUnused[dataValKey.Interface()] = struct{}{}
+	}
+
+	errors := make([]string, 0)
+
+	// This slice will keep track of all the structs we'll be decoding.
+	// There can be more than one struct if there are embedded structs
+	// that are squashed.
+	structs := make([]reflect.Value, 1, 5)
+	structs[0] = val
+
+	// Compile the list of all the fields that we're going to be decoding
+	// from all the structs.
+	type field struct {
+		field reflect.StructField
+		val   reflect.Value
+	}
+	fields := []field{}
+	for len(structs) > 0 {
+		structVal := structs[0]
+		structs = structs[1:]
+
+		structType := structVal.Type()
+
+		for i := 0; i < structType.NumField(); i++ {
+			fieldType := structType.Field(i)
+			fieldKind := fieldType.Type.Kind()
+
+			// If "squash" is specified in the tag, we squash the field down.
+			squash := false
+			tagParts := strings.Split(fieldType.Tag.Get(d.option.TagName), ",")
+			for _, tag := range tagParts[1:] {
+				if tag == "squash" {
+					squash = true
+					break
+				}
+			}
+
+			if squash {
+				if fieldKind != reflect.Struct {
+					errors = append(errors,
+						fmt.Errorf("%s: unsupported type for squash: %s", fieldType.Name, fieldKind).Error())
+				} else {
+					structs = append(structs, structVal.FieldByName(fieldType.Name))
+				}
+				continue
+			}
+
+			// Normal struct field, store it away
+			fields = append(fields, field{fieldType, structVal.Field(i)})
+		}
+	}
+
+	// for fieldType, field := range fields {
+	for _, f := range fields {
+		field, fieldValue := f.field, f.val
+		fieldName := field.Name
+
+		tagValue := field.Tag.Get(d.option.TagName)
+		tagValue = strings.SplitN(tagValue, ",", 2)[0]
+		if tagValue != "" {
+			fieldName = tagValue
+		}
+
+		rawMapKey := reflect.ValueOf(fieldName)
+		rawMapVal := dataVal.MapIndex(rawMapKey)
+		if !rawMapVal.IsValid() {
+			// Do a slower search by iterating over each key and
+			// doing case-insensitive search.
+			for dataValKey := range dataValKeys {
+				mK, ok := dataValKey.Interface().(string)
+				if !ok {
+					// Not a string key
+					continue
+				}
+
+				if strings.EqualFold(mK, fieldName) {
+					rawMapKey = dataValKey
+					rawMapVal = dataVal.MapIndex(dataValKey)
+					break
+				}
+			}
+
+			if !rawMapVal.IsValid() {
+				// There was no matching key in the map for the value in
+				// the struct. Just ignore.
+				continue
+			}
+		}
+
+		// Delete the key we're using from the unused map so we stop tracking
+		delete(dataValKeysUnused, rawMapKey.Interface())
+
+		if !fieldValue.IsValid() {
+			// This should never happen
+			panic("field is not valid")
+		}
+
+		// If we can't set the field, then it is unexported or something,
+		// and we just continue onwards.
+		if !fieldValue.CanSet() {
+			continue
+		}
+
+		// If the name is empty string, then we're at the root, and we
+		// don't dot-join the fields.
+		if name != "" {
+			fieldName = fmt.Sprintf("%s.%s", name, fieldName)
+		}
+
+		if err := d.decode(fieldName, rawMapVal.Interface(), fieldValue); err != nil {
+			errors = append(errors, err.Error())
+		}
+	}
+
+	if len(errors) > 0 {
+		return fmt.Errorf(strings.Join(errors, ","))
+	}
+
+	return nil
+}
+
 func (d *Decoder) setInterface(name string, data interface{}, val reflect.Value) (err error) {
 	dataVal := reflect.ValueOf(data)
 	val.Set(dataVal)

component/dialer/dialer.go

@@ -0,0 +1,174 @@
+package dialer
+
+import (
+	"context"
+	"errors"
+	"net"
+
+	"github.com/Dreamacro/clash/component/resolver"
+)
+
+func Dialer() (*net.Dialer, error) {
+	dialer := &net.Dialer{}
+	if DialerHook != nil {
+		if err := DialerHook(dialer); err != nil {
+			return nil, err
+		}
+	}
+
+	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)
+}
+
+func DialContext(ctx context.Context, network, address string) (net.Conn, error) {
+	switch network {
+	case "tcp4", "tcp6", "udp4", "udp6":
+		host, port, err := net.SplitHostPort(address)
+		if err != nil {
+			return nil, err
+		}
+
+		dialer, err := Dialer()
+		if err != nil {
+			return nil, err
+		}
+
+		var ip net.IP
+		switch network {
+		case "tcp4", "udp4":
+			ip, err = resolver.ResolveIPv4(host)
+		default:
+			ip, err = resolver.ResolveIPv6(host)
+		}
+
+		if err != nil {
+			return nil, err
+		}
+
+		if DialHook != nil {
+			if err := DialHook(dialer, network, ip); err != nil {
+				return nil, err
+			}
+		}
+		return dialer.DialContext(ctx, network, net.JoinHostPort(ip.String(), port))
+	case "tcp", "udp":
+		return dualStackDailContext(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()
+		if err != nil {
+			return nil, err
+		}
+		address = net.JoinHostPort(ip.String(), "0")
+	}
+	return lc.ListenPacket(context.Background(), network, address)
+}
+
+func dualStackDailContext(ctx context.Context, network, address string) (net.Conn, error) {
+	host, port, err := net.SplitHostPort(address)
+	if err != nil {
+		return nil, err
+	}
+
+	returned := make(chan struct{})
+	defer close(returned)
+
+	type dialResult struct {
+		net.Conn
+		error
+		resolved bool
+		ipv6     bool
+		done     bool
+	}
+	results := make(chan dialResult)
+	var primary, fallback dialResult
+
+	startRacer := func(ctx context.Context, network, host string, ipv6 bool) {
+		result := dialResult{ipv6: ipv6, done: true}
+		defer func() {
+			select {
+			case results <- result:
+			case <-returned:
+				if result.Conn != nil {
+					result.Conn.Close()
+				}
+			}
+		}()
+
+		dialer, err := Dialer()
+		if err != nil {
+			result.error = err
+			return
+		}
+
+		var ip net.IP
+		if ipv6 {
+			ip, result.error = resolver.ResolveIPv6(host)
+		} else {
+			ip, result.error = resolver.ResolveIPv4(host)
+		}
+		if result.error != nil {
+			return
+		}
+		result.resolved = true
+
+		if DialHook != nil {
+			if result.error = DialHook(dialer, network, ip); result.error != nil {
+				return
+			}
+		}
+		result.Conn, result.error = dialer.DialContext(ctx, network, net.JoinHostPort(ip.String(), port))
+	}
+
+	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
+			}
+
+			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 {
+					return nil, primary.error
+				}
+			}
+		}
+	}
+}

component/dialer/hook.go

@@ -0,0 +1,148 @@
+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)
+
+var (
+	DialerHook       DialerHookFunc
+	DialHook         DialHookFunc
+	ListenConfigHook ListenConfigHookFunc
+	ListenPacketHook ListenPacketHookFunc
+)
+
+var (
+	ErrAddrNotFound      = errors.New("addr not found")
+	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
+		}
+
+		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
+	}
+}
+
+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
+		}
+
+		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
+	}
+}

component/domain-trie/tire.go

@@ -6,8 +6,9 @@ import (
 )
 
 const (
-	wildcard   = "*"
-	domainStep = "."
+	wildcard    = "*"
+	dotWildcard = ""
+	domainStep  = "."
 )
 
 var (
@@ -21,8 +22,23 @@ type Trie struct {
 	root *Node
 }
 
-func isValidDomain(domain string) bool {
-	return domain != "" && domain[0] != '.' && domain[len(domain)-1] != '.'
+func validAndSplitDomain(domain string) ([]string, bool) {
+	if domain != "" && domain[len(domain)-1] == '.' {
+		return nil, false
+	}
+
+	parts := strings.Split(domain, domainStep)
+	if len(parts) == 1 {
+		return nil, false
+	}
+
+	for _, part := range parts[1:] {
+		if part == "" {
+			return nil, false
+		}
+	}
+
+	return parts, true
 }
 
 // Insert adds a node to the trie.
@@ -30,12 +46,13 @@ func isValidDomain(domain string) bool {
 // 1. www.example.com
 // 2. *.example.com
 // 3. subdomain.*.example.com
+// 4. .example.com
 func (t *Trie) Insert(domain string, data interface{}) error {
-	if !isValidDomain(domain) {
+	parts, valid := validAndSplitDomain(domain)
+	if !valid {
 		return ErrInvalidDomain
 	}
 
-	parts := strings.Split(domain, domainStep)
 	node := t.root
 	// reverse storage domain part to save space
 	for i := len(parts) - 1; i >= 0; i-- {
@@ -55,28 +72,45 @@ func (t *Trie) Insert(domain string, data interface{}) error {
 // Priority as:
 // 1. static part
 // 2. wildcard domain
+// 2. dot wildcard domain
 func (t *Trie) Search(domain string) *Node {
-	if !isValidDomain(domain) {
+	parts, valid := validAndSplitDomain(domain)
+	if !valid || parts[0] == "" {
 		return nil
 	}
-	parts := strings.Split(domain, domainStep)
 
 	n := t.root
+	var dotWildcardNode *Node
+	var wildcardNode *Node
 	for i := len(parts) - 1; i >= 0; i-- {
 		part := parts[i]
 
-		var child *Node
-		if !n.hasChild(part) {
-			if !n.hasChild(wildcard) {
-				return nil
-			}
-
-			child = n.getChild(wildcard)
-		} else {
-			child = n.getChild(part)
+		if node := n.getChild(dotWildcard); node != nil {
+			dotWildcardNode = node
 		}
 
+		child := n.getChild(part)
+		if child == nil && wildcardNode != nil {
+			child = wildcardNode.getChild(part)
+		}
+		wildcardNode = n.getChild(wildcard)
+
 		n = child
+		if n == nil {
+			n = wildcardNode
+			wildcardNode = nil
+		}
+
+		if n == nil {
+			break
+		}
+	}
+
+	if n == nil {
+		if dotWildcardNode != nil {
+			return dotWildcardNode
+		}
+		return nil
 	}
 
 	if n.Data == nil {

component/domain-trie/trie_test.go

@@ -3,6 +3,8 @@ package trie
 import (
 	"net"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 var localIP = net.IP{127, 0, 0, 1}
@@ -19,17 +21,9 @@ func TestTrie_Basic(t *testing.T) {
 	}
 
 	node := tree.Search("example.com")
-	if node == nil {
-		t.Error("should not recv nil")
-	}
-
-	if !node.Data.(net.IP).Equal(localIP) {
-		t.Error("should equal 127.0.0.1")
-	}
-
-	if tree.Insert("", localIP) == nil {
-		t.Error("should return error")
-	}
+	assert.NotNil(t, node)
+	assert.True(t, node.Data.(net.IP).Equal(localIP))
+	assert.NotNil(t, tree.Insert("", localIP))
 }
 
 func TestTrie_Wildcard(t *testing.T) {
@@ -38,50 +32,56 @@ func TestTrie_Wildcard(t *testing.T) {
 		"*.example.com",
 		"sub.*.example.com",
 		"*.dev",
+		".org",
+		".example.net",
+		".apple.*",
 	}
 
 	for _, domain := range domains {
 		tree.Insert(domain, localIP)
 	}
 
-	if tree.Search("sub.example.com") == nil {
-		t.Error("should not recv nil")
+	assert.NotNil(t, tree.Search("sub.example.com"))
+	assert.NotNil(t, tree.Search("sub.foo.example.com"))
+	assert.NotNil(t, tree.Search("test.org"))
+	assert.NotNil(t, tree.Search("test.example.net"))
+	assert.NotNil(t, tree.Search("test.apple.com"))
+	assert.Nil(t, tree.Search("foo.sub.example.com"))
+	assert.Nil(t, tree.Search("foo.example.dev"))
+	assert.Nil(t, tree.Search("example.com"))
+}
+
+func TestTrie_Priority(t *testing.T) {
+	tree := New()
+	domains := []string{
+		".dev",
+		"example.dev",
+		"*.example.dev",
+		"test.example.dev",
 	}
 
-	if tree.Search("sub.foo.example.com") == nil {
-		t.Error("should not recv nil")
+	assertFn := func(domain string, data int) {
+		node := tree.Search(domain)
+		assert.NotNil(t, node)
+		assert.Equal(t, data, node.Data)
 	}
 
-	if tree.Search("foo.sub.example.com") != nil {
-		t.Error("should recv nil")
+	for idx, domain := range domains {
+		tree.Insert(domain, idx)
 	}
 
-	if tree.Search("foo.example.dev") != nil {
-		t.Error("should recv nil")
-	}
-
-	if tree.Search("example.com") != nil {
-		t.Error("should recv nil")
-	}
+	assertFn("test.dev", 0)
+	assertFn("foo.bar.dev", 0)
+	assertFn("example.dev", 1)
+	assertFn("foo.example.dev", 2)
+	assertFn("test.example.dev", 3)
 }
 
 func TestTrie_Boundary(t *testing.T) {
 	tree := New()
 	tree.Insert("*.dev", localIP)
 
-	if err := tree.Insert(".", localIP); err == nil {
-		t.Error("should recv err")
-	}
-
-	if err := tree.Insert(".com", localIP); err == nil {
-		t.Error("should recv err")
-	}
-
-	if tree.Search("dev") != nil {
-		t.Error("should recv nil")
-	}
-
-	if tree.Search(".dev") != nil {
-		t.Error("should recv nil")
-	}
+	assert.NotNil(t, tree.Insert(".", localIP))
+	assert.NotNil(t, tree.Insert("..dev", localIP))
+	assert.Nil(t, tree.Search("dev"))
 }

component/fakeip/pool.go

@@ -6,6 +6,7 @@ import (
 	"sync"
 
 	"github.com/Dreamacro/clash/common/cache"
+	trie "github.com/Dreamacro/clash/component/domain-trie"
 )
 
 // Pool is a implementation about fake ip generator without storage
@@ -14,7 +15,8 @@ type Pool struct {
 	min     uint32
 	gateway uint32
 	offset  uint32
-	mux     *sync.Mutex
+	mux     sync.Mutex
+	host    *trie.Trie
 	cache   *cache.LruCache
 }
 
@@ -60,6 +62,28 @@ func (p *Pool) LookBack(ip net.IP) (string, bool) {
 	return "", false
 }
 
+// LookupHost return if domain in host
+func (p *Pool) LookupHost(domain string) bool {
+	if p.host == nil {
+		return false
+	}
+	return p.host.Search(domain) != nil
+}
+
+// Exist returns if given ip exists in fake-ip pool
+func (p *Pool) Exist(ip net.IP) bool {
+	p.mux.Lock()
+	defer p.mux.Unlock()
+
+	if ip = ip.To4(); ip == nil {
+		return false
+	}
+
+	n := ipToUint(ip.To4())
+	offset := n - p.min + 1
+	return p.cache.Exist(offset)
+}
+
 // Gateway return gateway ip
 func (p *Pool) Gateway() net.IP {
 	return uintToIP(p.gateway)
@@ -96,7 +120,7 @@ func uintToIP(v uint32) net.IP {
 }
 
 // New return Pool instance
-func New(ipnet *net.IPNet, size int) (*Pool, error) {
+func New(ipnet *net.IPNet, size int, host *trie.Trie) (*Pool, error) {
 	min := ipToUint(ipnet.IP) + 2
 
 	ones, bits := ipnet.Mask.Size()
@@ -111,7 +135,7 @@ func New(ipnet *net.IPNet, size int) (*Pool, error) {
 		min:     min,
 		max:     max,
 		gateway: min - 1,
-		mux:     &sync.Mutex{},
+		host:    host,
 		cache:   cache.NewLRUCache(cache.WithSize(size * 2)),
 	}, nil
 }

component/fakeip/pool_test.go

@@ -9,7 +9,7 @@ import (
 
 func TestPool_Basic(t *testing.T) {
 	_, ipnet, _ := net.ParseCIDR("192.168.0.1/29")
-	pool, _ := New(ipnet, 10)
+	pool, _ := New(ipnet, 10, nil)
 
 	first := pool.Lookup("foo.com")
 	last := pool.Lookup("bar.com")
@@ -23,7 +23,7 @@ func TestPool_Basic(t *testing.T) {
 
 func TestPool_Cycle(t *testing.T) {
 	_, ipnet, _ := net.ParseCIDR("192.168.0.1/30")
-	pool, _ := New(ipnet, 10)
+	pool, _ := New(ipnet, 10, nil)
 
 	first := pool.Lookup("foo.com")
 	same := pool.Lookup("baz.com")
@@ -33,7 +33,7 @@ func TestPool_Cycle(t *testing.T) {
 
 func TestPool_MaxCacheSize(t *testing.T) {
 	_, ipnet, _ := net.ParseCIDR("192.168.0.1/24")
-	pool, _ := New(ipnet, 2)
+	pool, _ := New(ipnet, 2, nil)
 
 	first := pool.Lookup("foo.com")
 	pool.Lookup("bar.com")
@@ -45,7 +45,7 @@ func TestPool_MaxCacheSize(t *testing.T) {
 
 func TestPool_DoubleMapping(t *testing.T) {
 	_, ipnet, _ := net.ParseCIDR("192.168.0.1/24")
-	pool, _ := New(ipnet, 2)
+	pool, _ := New(ipnet, 2, nil)
 
 	// fill cache
 	fooIP := pool.Lookup("foo.com")
@@ -72,7 +72,7 @@ func TestPool_DoubleMapping(t *testing.T) {
 
 func TestPool_Error(t *testing.T) {
 	_, ipnet, _ := net.ParseCIDR("192.168.0.1/31")
-	_, err := New(ipnet, 10)
+	_, err := New(ipnet, 10, nil)
 
 	assert.Error(t, err)
 }

component/mmdb/mmdb.go

@@ -0,0 +1,43 @@
+package mmdb
+
+import (
+	"sync"
+
+	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/log"
+
+	"github.com/oschwald/geoip2-golang"
+)
+
+var mmdb *geoip2.Reader
+var once sync.Once
+
+func LoadFromBytes(buffer []byte) {
+	once.Do(func() {
+		var err error
+		mmdb, err = geoip2.FromBytes(buffer)
+		if err != nil {
+			log.Fatalln("Can't load mmdb: %s", err.Error())
+		}
+	})
+}
+
+func Verify() bool {
+	instance, err := geoip2.Open(C.Path.MMDB())
+	if err == nil {
+		instance.Close()
+	}
+	return err == nil
+}
+
+func Instance() *geoip2.Reader {
+	once.Do(func() {
+		var err error
+		mmdb, err = geoip2.Open(C.Path.MMDB())
+		if err != nil {
+			log.Fatalln("Can't load mmdb: %s", err.Error())
+		}
+	})
+
+	return mmdb
+}

component/nat/table.go

@@ -1,34 +1,25 @@
 package nat
 
 import (
-	"net"
 	"sync"
+
+	C "github.com/Dreamacro/clash/constant"
 )
 
 type Table struct {
 	mapping sync.Map
 }
 
-type element struct {
-	RemoteAddr net.Addr
-	RemoteConn net.PacketConn
+func (t *Table) Set(key string, pc C.PacketConn) {
+	t.mapping.Store(key, pc)
 }
 
-func (t *Table) Set(key string, pc net.PacketConn, addr net.Addr) {
-	// set conn read timeout
-	t.mapping.Store(key, &element{
-		RemoteConn: pc,
-		RemoteAddr: addr,
-	})
-}
-
-func (t *Table) Get(key string) (net.PacketConn, net.Addr) {
+func (t *Table) Get(key string) C.PacketConn {
 	item, exist := t.mapping.Load(key)
 	if !exist {
-		return nil, nil
+		return nil
 	}
-	elm := item.(*element)
-	return elm.RemoteConn, elm.RemoteAddr
+	return item.(C.PacketConn)
 }
 
 func (t *Table) GetOrCreateLock(key string) (*sync.WaitGroup, bool) {

component/resolver/resolver.go

@@ -1,16 +1,32 @@
-package dns
+package resolver
 
 import (
 	"errors"
 	"net"
 	"strings"
+
+	trie "github.com/Dreamacro/clash/component/domain-trie"
 )
 
 var (
-	errIPNotFound = errors.New("cannot found ip")
-	errIPVersion  = errors.New("ip version error")
+	// DefaultResolver aim to resolve ip
+	DefaultResolver Resolver
+
+	// DefaultHosts aim to resolve hosts
+	DefaultHosts = trie.New()
 )
 
+var (
+	ErrIPNotFound = errors.New("couldn't find ip")
+	ErrIPVersion  = errors.New("ip version error")
+)
+
+type Resolver interface {
+	ResolveIP(host string) (ip net.IP, err error)
+	ResolveIPv4(host string) (ip net.IP, err error)
+	ResolveIPv6(host string) (ip net.IP, err error)
+}
+
 // ResolveIPv4 with a host, return ipv4
 func ResolveIPv4(host string) (net.IP, error) {
 	if node := DefaultHosts.Search(host); node != nil {
@@ -24,7 +40,7 @@ func ResolveIPv4(host string) (net.IP, error) {
 		if !strings.Contains(host, ":") {
 			return ip, nil
 		}
-		return nil, errIPVersion
+		return nil, ErrIPVersion
 	}
 
 	if DefaultResolver != nil {
@@ -42,7 +58,7 @@ func ResolveIPv4(host string) (net.IP, error) {
 		}
 	}
 
-	return nil, errIPNotFound
+	return nil, ErrIPNotFound
 }
 
 // ResolveIPv6 with a host, return ipv6
@@ -58,7 +74,7 @@ func ResolveIPv6(host string) (net.IP, error) {
 		if strings.Contains(host, ":") {
 			return ip, nil
 		}
-		return nil, errIPVersion
+		return nil, ErrIPVersion
 	}
 
 	if DefaultResolver != nil {
@@ -76,7 +92,7 @@ func ResolveIPv6(host string) (net.IP, error) {
 		}
 	}
 
-	return nil, errIPNotFound
+	return nil, ErrIPNotFound
 }
 
 // ResolveIP with a host, return ip
@@ -86,10 +102,7 @@ func ResolveIP(host string) (net.IP, error) {
 	}
 
 	if DefaultResolver != nil {
-		if DefaultResolver.ipv6 {
-			return DefaultResolver.ResolveIP(host)
-		}
-		return DefaultResolver.ResolveIPv4(host)
+		return DefaultResolver.ResolveIP(host)
 	}
 
 	ip := net.ParseIP(host)

component/simple-obfs/http.go

@@ -34,15 +34,15 @@ func (ho *HTTPObfs) Read(b []byte) (int, error) {
 	}
 
 	if ho.firstResponse {
-		buf := pool.BufPool.Get().([]byte)
+		buf := pool.Get(pool.RelayBufferSize)
 		n, err := ho.Conn.Read(buf)
 		if err != nil {
-			pool.BufPool.Put(buf[:cap(buf)])
+			pool.Put(buf)
 			return 0, err
 		}
 		idx := bytes.Index(buf[:n], []byte("\r\n\r\n"))
 		if idx == -1 {
-			pool.BufPool.Put(buf[:cap(buf)])
+			pool.Put(buf)
 			return 0, io.EOF
 		}
 		ho.firstResponse = false
@@ -52,7 +52,7 @@ func (ho *HTTPObfs) Read(b []byte) (int, error) {
 			ho.buf = buf[:idx+4+length]
 			ho.offset = idx + 4 + n
 		} else {
-			pool.BufPool.Put(buf[:cap(buf)])
+			pool.Put(buf)
 		}
 		return n, nil
 	}

component/simple-obfs/tls.go

@@ -29,12 +29,12 @@ type TLSObfs struct {
 }
 
 func (to *TLSObfs) read(b []byte, discardN int) (int, error) {
-	buf := pool.BufPool.Get().([]byte)
-	_, err := io.ReadFull(to.Conn, buf[:discardN])
+	buf := pool.Get(discardN)
+	_, err := io.ReadFull(to.Conn, buf)
 	if err != nil {
 		return 0, err
 	}
-	pool.BufPool.Put(buf[:cap(buf)])
+	pool.Put(buf)
 
 	sizeBuf := make([]byte, 2)
 	_, err = io.ReadFull(to.Conn, sizeBuf)
@@ -102,15 +102,11 @@ func (to *TLSObfs) write(b []byte) (int, error) {
 		return len(b), err
 	}
 
-	size := pool.BufPool.Get().([]byte)
-	binary.BigEndian.PutUint16(size[:2], uint16(len(b)))
-
 	buf := &bytes.Buffer{}
 	buf.Write([]byte{0x17, 0x03, 0x03})
-	buf.Write(size[:2])
+	binary.Write(buf, binary.BigEndian, uint16(len(b)))
 	buf.Write(b)
 	_, err := to.Conn.Write(buf.Bytes())
-	pool.BufPool.Put(size[:cap(size)])
 	return len(b), err
 }
 

component/socks5/socks5.go

@@ -2,6 +2,7 @@ package socks5
 
 import (
 	"bytes"
+	"encoding/binary"
 	"errors"
 	"io"
 	"net"
@@ -62,6 +63,25 @@ func (a Addr) String() string {
 	return net.JoinHostPort(host, port)
 }
 
+// UDPAddr converts a socks5.Addr to *net.UDPAddr
+func (a Addr) UDPAddr() *net.UDPAddr {
+	if len(a) == 0 {
+		return nil
+	}
+	switch a[0] {
+	case AtypIPv4:
+		var ip [net.IPv4len]byte
+		copy(ip[0:], a[1:1+net.IPv4len])
+		return &net.UDPAddr{IP: net.IP(ip[:]), Port: int(binary.BigEndian.Uint16(a[1+net.IPv4len : 1+net.IPv4len+2]))}
+	case AtypIPv6:
+		var ip [net.IPv6len]byte
+		copy(ip[0:], a[1:1+net.IPv6len])
+		return &net.UDPAddr{IP: net.IP(ip[:]), Port: int(binary.BigEndian.Uint16(a[1+net.IPv6len : 1+net.IPv6len+2]))}
+	}
+	// Other Atyp
+	return nil
+}
+
 // SOCKS errors as defined in RFC 1928 section 6.
 const (
 	ErrGeneralFailure       = Error(1)
@@ -158,7 +178,7 @@ func ServerHandshake(rw net.Conn, authenticator auth.Authenticator) (addr Addr,
 	}
 
 	command = buf[1]
-	addr, err = readAddr(rw, buf)
+	addr, err = ReadAddr(rw, buf)
 	if err != nil {
 		return
 	}
@@ -240,10 +260,10 @@ func ClientHandshake(rw io.ReadWriter, addr Addr, command Command, user *User) (
 		return nil, err
 	}
 
-	return readAddr(rw, buf)
+	return ReadAddr(rw, buf)
 }
 
-func readAddr(r io.Reader, b []byte) (Addr, error) {
+func ReadAddr(r io.Reader, b []byte) (Addr, error) {
 	if len(b) < MaxAddrLen {
 		return nil, io.ErrShortBuffer
 	}
@@ -338,6 +358,40 @@ func ParseAddr(s string) Addr {
 	return addr
 }
 
+// ParseAddrToSocksAddr parse a socks addr from net.addr
+// This is a fast path of ParseAddr(addr.String())
+func ParseAddrToSocksAddr(addr net.Addr) Addr {
+	var hostip net.IP
+	var port int
+	if udpaddr, ok := addr.(*net.UDPAddr); ok {
+		hostip = udpaddr.IP
+		port = udpaddr.Port
+	} else if tcpaddr, ok := addr.(*net.TCPAddr); ok {
+		hostip = tcpaddr.IP
+		port = tcpaddr.Port
+	}
+
+	// fallback parse
+	if hostip == nil {
+		return ParseAddr(addr.String())
+	}
+
+	var parsed Addr
+	if ip4 := hostip.To4(); ip4.DefaultMask() != nil {
+		parsed = make([]byte, 1+net.IPv4len+2)
+		parsed[0] = AtypIPv4
+		copy(parsed[1:], ip4)
+		binary.BigEndian.PutUint16(parsed[1+net.IPv4len:], uint16(port))
+
+	} else {
+		parsed = make([]byte, 1+net.IPv6len+2)
+		parsed[0] = AtypIPv6
+		copy(parsed[1:], hostip)
+		binary.BigEndian.PutUint16(parsed[1+net.IPv6len:], uint16(port))
+	}
+	return parsed
+}
+
 // DecodeUDPPacket split `packet` to addr payload, and this function is mutable with `packet`
 func DecodeUDPPacket(packet []byte) (addr Addr, payload []byte, err error) {
 	if len(packet) < 5 {

component/trojan/trojan.go

@@ -0,0 +1,223 @@
+package trojan
+
+import (
+	"bytes"
+	"crypto/sha256"
+	"crypto/tls"
+	"encoding/binary"
+	"encoding/hex"
+	"errors"
+	"io"
+	"net"
+	"sync"
+
+	"github.com/Dreamacro/clash/component/socks5"
+)
+
+const (
+	// max packet length
+	maxLength = 8192
+)
+
+var (
+	defaultALPN = []string{"h2", "http/1.1"}
+	crlf        = []byte{'\r', '\n'}
+
+	bufPool = sync.Pool{New: func() interface{} { return &bytes.Buffer{} }}
+)
+
+type Command = byte
+
+var (
+	CommandTCP byte = 1
+	CommandUDP byte = 3
+)
+
+type Option struct {
+	Password           string
+	ALPN               []string
+	ServerName         string
+	SkipCertVerify     bool
+	ClientSessionCache tls.ClientSessionCache
+}
+
+type Trojan struct {
+	option      *Option
+	hexPassword []byte
+}
+
+func (t *Trojan) StreamConn(conn net.Conn) (net.Conn, error) {
+	alpn := defaultALPN
+	if len(t.option.ALPN) != 0 {
+		alpn = t.option.ALPN
+	}
+
+	tlsConfig := &tls.Config{
+		NextProtos:         alpn,
+		MinVersion:         tls.VersionTLS12,
+		InsecureSkipVerify: t.option.SkipCertVerify,
+		ServerName:         t.option.ServerName,
+		ClientSessionCache: t.option.ClientSessionCache,
+	}
+
+	tlsConn := tls.Client(conn, tlsConfig)
+	if err := tlsConn.Handshake(); err != nil {
+		return nil, err
+	}
+
+	return tlsConn, nil
+}
+
+func (t *Trojan) WriteHeader(w io.Writer, command Command, socks5Addr []byte) error {
+	buf := bufPool.Get().(*bytes.Buffer)
+	defer buf.Reset()
+	defer bufPool.Put(buf)
+
+	buf.Write(t.hexPassword)
+	buf.Write(crlf)
+
+	buf.WriteByte(command)
+	buf.Write(socks5Addr)
+	buf.Write(crlf)
+
+	_, err := w.Write(buf.Bytes())
+	return err
+}
+
+func (t *Trojan) PacketConn(conn net.Conn) net.PacketConn {
+	return &PacketConn{
+		Conn: conn,
+	}
+}
+
+func writePacket(w io.Writer, socks5Addr, payload []byte) (int, error) {
+	buf := bufPool.Get().(*bytes.Buffer)
+	defer buf.Reset()
+	defer bufPool.Put(buf)
+
+	buf.Write(socks5Addr)
+	binary.Write(buf, binary.BigEndian, uint16(len(payload)))
+	buf.Write(crlf)
+	buf.Write(payload)
+
+	return w.Write(buf.Bytes())
+}
+
+func WritePacket(w io.Writer, socks5Addr, payload []byte) (int, error) {
+	if len(payload) <= maxLength {
+		return writePacket(w, socks5Addr, payload)
+	}
+
+	offset := 0
+	total := len(payload)
+	for {
+		cursor := offset + maxLength
+		if cursor > total {
+			cursor = total
+		}
+
+		n, err := writePacket(w, socks5Addr, payload[offset:cursor])
+		if err != nil {
+			return offset + n, err
+		}
+
+		offset = cursor
+		if offset == total {
+			break
+		}
+	}
+
+	return total, nil
+}
+
+func ReadPacket(r io.Reader, payload []byte) (net.Addr, int, int, error) {
+	addr, err := socks5.ReadAddr(r, payload)
+	if err != nil {
+		return nil, 0, 0, errors.New("read addr error")
+	}
+	uAddr := addr.UDPAddr()
+
+	if _, err = io.ReadFull(r, payload[:2]); err != nil {
+		return nil, 0, 0, errors.New("read length error")
+	}
+
+	total := int(binary.BigEndian.Uint16(payload[:2]))
+	if total > maxLength {
+		return nil, 0, 0, errors.New("packet invalid")
+	}
+
+	// read crlf
+	if _, err = io.ReadFull(r, payload[:2]); err != nil {
+		return nil, 0, 0, errors.New("read crlf error")
+	}
+
+	length := len(payload)
+	if total < length {
+		length = total
+	}
+
+	if _, err = io.ReadFull(r, payload[:length]); err != nil {
+		return nil, 0, 0, errors.New("read packet error")
+	}
+
+	return uAddr, length, total - length, nil
+}
+
+func New(option *Option) *Trojan {
+	return &Trojan{option, hexSha224([]byte(option.Password))}
+}
+
+type PacketConn struct {
+	net.Conn
+	remain int
+	rAddr  net.Addr
+	mux    sync.Mutex
+}
+
+func (pc *PacketConn) WriteTo(b []byte, addr net.Addr) (int, error) {
+	return WritePacket(pc, socks5.ParseAddr(addr.String()), b)
+}
+
+func (pc *PacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	pc.mux.Lock()
+	defer pc.mux.Unlock()
+	if pc.remain != 0 {
+		length := len(b)
+		if pc.remain < length {
+			length = pc.remain
+		}
+
+		n, err := pc.Conn.Read(b[:length])
+		if err != nil {
+			return 0, nil, err
+		}
+
+		pc.remain -= n
+		addr := pc.rAddr
+		if pc.remain == 0 {
+			pc.rAddr = nil
+		}
+
+		return n, addr, nil
+	}
+
+	addr, n, remain, err := ReadPacket(pc.Conn, b)
+	if err != nil {
+		return 0, nil, err
+	}
+
+	if remain != 0 {
+		pc.remain = remain
+		pc.rAddr = addr
+	}
+
+	return n, addr, nil
+}
+
+func hexSha224(data []byte) []byte {
+	buf := make([]byte, 56)
+	hash := sha256.New224()
+	hash.Write(data)
+	hex.Encode(buf, hash.Sum(nil))
+	return buf
+}

component/v2ray-plugin/mux.go

@@ -52,7 +52,7 @@ func (m *Mux) Read(b []byte) (int, error) {
 		if err != nil {
 			return 0, err
 		}
-		m.remain = m.remain - n
+		m.remain -= n
 		return n, nil
 	}
 

component/v2ray-plugin/websocket.go

@@ -10,11 +10,14 @@ import (
 
 // Option is options of websocket obfs
 type Option struct {
-	Host      string
-	Path      string
-	Headers   map[string]string
-	TLSConfig *tls.Config
-	Mux       bool
+	Host           string
+	Port           string
+	Path           string
+	Headers        map[string]string
+	TLS            bool
+	SkipCertVerify bool
+	SessionCache   tls.ClientSessionCache
+	Mux            bool
 }
 
 // NewV2rayObfs return a HTTPObfs
@@ -25,15 +28,17 @@ func NewV2rayObfs(conn net.Conn, option *Option) (net.Conn, error) {
 	}
 
 	config := &vmess.WebsocketConfig{
-		Host:      option.Host,
-		Path:      option.Path,
-		TLS:       option.TLSConfig != nil,
-		Headers:   header,
-		TLSConfig: option.TLSConfig,
+		Host:           option.Host,
+		Port:           option.Port,
+		Path:           option.Path,
+		TLS:            option.TLS,
+		Headers:        header,
+		SkipCertVerify: option.SkipCertVerify,
+		SessionCache:   option.SessionCache,
 	}
 
 	var err error
-	conn, err = vmess.NewWebsocketConn(conn, config)
+	conn, err = vmess.StreamWebsocketConn(conn, config)
 	if err != nil {
 		return nil, err
 	}

component/vmess/aead.go

@@ -22,8 +22,8 @@ func newAEADWriter(w io.Writer, aead cipher.AEAD, iv []byte) *aeadWriter {
 }
 
 func (w *aeadWriter) Write(b []byte) (n int, err error) {
-	buf := pool.BufPool.Get().([]byte)
-	defer pool.BufPool.Put(buf[:cap(buf)])
+	buf := pool.Get(pool.RelayBufferSize)
+	defer pool.Put(buf)
 	length := len(b)
 	for {
 		if length == 0 {
@@ -73,7 +73,7 @@ func (r *aeadReader) Read(b []byte) (int, error) {
 		n := copy(b, r.buf[r.offset:])
 		r.offset += n
 		if r.offset == len(r.buf) {
-			pool.BufPool.Put(r.buf[:cap(r.buf)])
+			pool.Put(r.buf)
 			r.buf = nil
 		}
 		return n, nil
@@ -89,10 +89,10 @@ func (r *aeadReader) Read(b []byte) (int, error) {
 		return 0, errors.New("Buffer is larger than standard")
 	}
 
-	buf := pool.BufPool.Get().([]byte)
+	buf := pool.Get(size)
 	_, err = io.ReadFull(r.Reader, buf[:size])
 	if err != nil {
-		pool.BufPool.Put(buf[:cap(buf)])
+		pool.Put(buf)
 		return 0, err
 	}
 
@@ -107,7 +107,7 @@ func (r *aeadReader) Read(b []byte) (int, error) {
 	realLen := size - r.Overhead()
 	n := copy(b, buf[:realLen])
 	if len(b) >= realLen {
-		pool.BufPool.Put(buf[:cap(buf)])
+		pool.Put(buf)
 		return n, nil
 	}
 

component/vmess/chunk.go

@@ -34,7 +34,7 @@ func (cr *chunkReader) Read(b []byte) (int, error) {
 		n := copy(b, cr.buf[cr.offset:])
 		cr.offset += n
 		if cr.offset == len(cr.buf) {
-			pool.BufPool.Put(cr.buf[:cap(cr.buf)])
+			pool.Put(cr.buf)
 			cr.buf = nil
 		}
 		return n, nil
@@ -59,15 +59,15 @@ func (cr *chunkReader) Read(b []byte) (int, error) {
 		return size, nil
 	}
 
-	buf := pool.BufPool.Get().([]byte)
-	_, err = io.ReadFull(cr.Reader, buf[:size])
+	buf := pool.Get(size)
+	_, err = io.ReadFull(cr.Reader, buf)
 	if err != nil {
-		pool.BufPool.Put(buf[:cap(buf)])
+		pool.Put(buf)
 		return 0, err
 	}
-	n := copy(b, cr.buf[:])
+	n := copy(b, buf)
 	cr.offset = n
-	cr.buf = buf[:size]
+	cr.buf = buf
 	return n, nil
 }
 
@@ -76,8 +76,8 @@ type chunkWriter struct {
 }
 
 func (cw *chunkWriter) Write(b []byte) (n int, err error) {
-	buf := pool.BufPool.Get().([]byte)
-	defer pool.BufPool.Put(buf[:cap(buf)])
+	buf := pool.Get(pool.RelayBufferSize)
+	defer pool.Put(buf)
 	length := len(b)
 	for {
 		if length == 0 {

component/vmess/http.go

@@ -0,0 +1,76 @@
+package vmess
+
+import (
+	"bytes"
+	"fmt"
+	"math/rand"
+	"net"
+	"net/http"
+	"net/textproto"
+)
+
+type httpConn struct {
+	net.Conn
+	cfg        *HTTPConfig
+	rhandshake bool
+	whandshake bool
+}
+
+type HTTPConfig struct {
+	Method  string
+	Host    string
+	Path    []string
+	Headers map[string][]string
+}
+
+// Read implements net.Conn.Read()
+func (hc *httpConn) Read(b []byte) (int, error) {
+	if hc.rhandshake {
+		n, err := hc.Conn.Read(b)
+		return n, err
+	}
+
+	reader := textproto.NewConn(hc.Conn)
+	// First line: GET /index.html HTTP/1.0
+	if _, err := reader.ReadLine(); err != nil {
+		return 0, err
+	}
+
+	if _, err := reader.ReadMIMEHeader(); err != nil {
+		return 0, err
+	}
+
+	hc.rhandshake = true
+	return hc.Conn.Read(b)
+}
+
+// Write implements io.Writer.
+func (hc *httpConn) Write(b []byte) (int, error) {
+	if hc.whandshake {
+		return hc.Conn.Write(b)
+	}
+
+	path := hc.cfg.Path[rand.Intn(len(hc.cfg.Path))]
+	u := fmt.Sprintf("http://%s%s", hc.cfg.Host, path)
+	req, _ := http.NewRequest("GET", u, bytes.NewBuffer(b))
+	for key, list := range hc.cfg.Headers {
+		req.Header.Set(key, list[rand.Intn(len(list))])
+	}
+	req.ContentLength = int64(len(b))
+	if err := req.Write(hc.Conn); err != nil {
+		return 0, err
+	}
+	hc.whandshake = true
+	return len(b), nil
+}
+
+func (hc *httpConn) Close() error {
+	return hc.Conn.Close()
+}
+
+func StreamHTTPConn(conn net.Conn, cfg *HTTPConfig) net.Conn {
+	return &httpConn{
+		Conn: conn,
+		cfg:  cfg,
+	}
+}

component/vmess/tls.go

@@ -0,0 +1,24 @@
+package vmess
+
+import (
+	"crypto/tls"
+	"net"
+)
+
+type TLSConfig struct {
+	Host           string
+	SkipCertVerify bool
+	SessionCache   tls.ClientSessionCache
+}
+
+func StreamTLSConn(conn net.Conn, cfg *TLSConfig) (net.Conn, error) {
+	tlsConfig := &tls.Config{
+		ServerName:         cfg.Host,
+		InsecureSkipVerify: cfg.SkipCertVerify,
+		ClientSessionCache: cfg.SessionCache,
+	}
+
+	tlsConn := tls.Client(conn, tlsConfig)
+	err := tlsConn.Handshake()
+	return tlsConn, err
+}

component/vmess/vmess.go

@@ -5,7 +5,6 @@ import (
 	"fmt"
 	"math/rand"
 	"net"
-	"net/http"
 	"runtime"
 	"sync"
 
@@ -66,42 +65,23 @@ type DstAddr struct {
 
 // Client is vmess connection generator
 type Client struct {
-	user      []*ID
-	uuid      *uuid.UUID
-	security  Security
-	tls       bool
-	host      string
-	wsConfig  *WebsocketConfig
-	tlsConfig *tls.Config
+	user     []*ID
+	uuid     *uuid.UUID
+	security Security
 }
 
 // Config of vmess
 type Config struct {
-	UUID             string
-	AlterID          uint16
-	Security         string
-	TLS              bool
-	HostName         string
-	Port             string
-	NetWork          string
-	WebSocketPath    string
-	WebSocketHeaders map[string]string
-	SkipCertVerify   bool
-	SessionCache     tls.ClientSessionCache
+	UUID     string
+	AlterID  uint16
+	Security string
+	Port     string
+	HostName string
 }
 
-// New return a Conn with net.Conn and DstAddr
-func (c *Client) New(conn net.Conn, dst *DstAddr) (net.Conn, error) {
-	var err error
+// StreamConn return a Conn with net.Conn and DstAddr
+func (c *Client) StreamConn(conn net.Conn, dst *DstAddr) (net.Conn, error) {
 	r := rand.Intn(len(c.user))
-	if c.wsConfig != nil {
-		conn, err = NewWebsocketConn(conn, c.wsConfig)
-		if err != nil {
-			return nil, err
-		}
-	} else if c.tls {
-		conn = tls.Client(conn, c.tlsConfig)
-	}
 	return newConn(conn, c.user[r], dst, c.security)
 }
 
@@ -129,57 +109,9 @@ func NewClient(config Config) (*Client, error) {
 		return nil, fmt.Errorf("Unknown security type: %s", config.Security)
 	}
 
-	if config.NetWork != "" && config.NetWork != "ws" {
-		return nil, fmt.Errorf("Unknown network type: %s", config.NetWork)
-	}
-
-	header := http.Header{}
-	for k, v := range config.WebSocketHeaders {
-		header.Add(k, v)
-	}
-
-	host := net.JoinHostPort(config.HostName, config.Port)
-
-	var tlsConfig *tls.Config
-	if config.TLS {
-		tlsConfig = &tls.Config{
-			ServerName:         config.HostName,
-			InsecureSkipVerify: config.SkipCertVerify,
-			ClientSessionCache: config.SessionCache,
-		}
-		if tlsConfig.ClientSessionCache == nil {
-			tlsConfig.ClientSessionCache = getClientSessionCache()
-		}
-		if host := header.Get("Host"); host != "" {
-			tlsConfig.ServerName = host
-		}
-	}
-
-	var wsConfig *WebsocketConfig
-	if config.NetWork == "ws" {
-		wsConfig = &WebsocketConfig{
-			Host:      host,
-			Path:      config.WebSocketPath,
-			Headers:   header,
-			TLS:       config.TLS,
-			TLSConfig: tlsConfig,
-		}
-	}
-
 	return &Client{
-		user:      newAlterIDs(newID(&uid), config.AlterID),
-		uuid:      &uid,
-		security:  security,
-		tls:       config.TLS,
-		host:      host,
-		wsConfig:  wsConfig,
-		tlsConfig: tlsConfig,
+		user:     newAlterIDs(newID(&uid), config.AlterID),
+		uuid:     &uid,
+		security: security,
 	}, nil
 }
-
-func getClientSessionCache() tls.ClientSessionCache {
-	once.Do(func() {
-		clientSessionCache = tls.NewLRUClientSessionCache(128)
-	})
-	return clientSessionCache
-}

component/vmess/websocket.go

@@ -8,6 +8,7 @@ import (
 	"net/http"
 	"net/url"
 	"strings"
+	"sync"
 	"time"
 
 	"github.com/gorilla/websocket"
@@ -17,18 +18,26 @@ type websocketConn struct {
 	conn       *websocket.Conn
 	reader     io.Reader
 	remoteAddr net.Addr
+
+	// https://godoc.org/github.com/gorilla/websocket#hdr-Concurrency
+	rMux sync.Mutex
+	wMux sync.Mutex
 }
 
 type WebsocketConfig struct {
-	Host      string
-	Path      string
-	Headers   http.Header
-	TLS       bool
-	TLSConfig *tls.Config
+	Host           string
+	Port           string
+	Path           string
+	Headers        http.Header
+	TLS            bool
+	SkipCertVerify bool
+	SessionCache   tls.ClientSessionCache
 }
 
 // Read implements net.Conn.Read()
 func (wsc *websocketConn) Read(b []byte) (int, error) {
+	wsc.rMux.Lock()
+	defer wsc.rMux.Unlock()
 	for {
 		reader, err := wsc.getReader()
 		if err != nil {
@@ -46,6 +55,8 @@ func (wsc *websocketConn) Read(b []byte) (int, error) {
 
 // Write implements io.Writer.
 func (wsc *websocketConn) Write(b []byte) (int, error) {
+	wsc.wMux.Lock()
+	defer wsc.wMux.Unlock()
 	if err := wsc.conn.WriteMessage(websocket.BinaryMessage, b); err != nil {
 		return 0, err
 	}
@@ -102,7 +113,7 @@ func (wsc *websocketConn) SetWriteDeadline(t time.Time) error {
 	return wsc.conn.SetWriteDeadline(t)
 }
 
-func NewWebsocketConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
+func StreamWebsocketConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
 	dialer := &websocket.Dialer{
 		NetDial: func(network, addr string) (net.Conn, error) {
 			return conn, nil
@@ -115,17 +126,20 @@ func NewWebsocketConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
 	scheme := "ws"
 	if c.TLS {
 		scheme = "wss"
-		dialer.TLSClientConfig = c.TLSConfig
-	}
+		dialer.TLSClientConfig = &tls.Config{
+			ServerName:         c.Host,
+			InsecureSkipVerify: c.SkipCertVerify,
+			ClientSessionCache: c.SessionCache,
+		}
 
-	host, port, _ := net.SplitHostPort(c.Host)
-	if (scheme == "ws" && port != "80") || (scheme == "wss" && port != "443") {
-		host = c.Host
+		if host := c.Headers.Get("Host"); host != "" {
+			dialer.TLSClientConfig.ServerName = host
+		}
 	}
 
 	uri := url.URL{
 		Scheme: scheme,
-		Host:   host,
+		Host:   net.JoinHostPort(c.Host, c.Port),
 		Path:   c.Path,
 	}
 
@@ -142,7 +156,7 @@ func NewWebsocketConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
 		if resp != nil {
 			reason = resp.Status
 		}
-		return nil, fmt.Errorf("Dial %s error: %s", host, reason)
+		return nil, fmt.Errorf("Dial %s error: %s", uri.Host, reason)
 	}
 
 	return &websocketConn{

config/config.go

@@ -1,16 +1,16 @@
 package config
 
 import (
+	"errors"
 	"fmt"
-	"io/ioutil"
 	"net"
 	"net/url"
 	"os"
-	"path/filepath"
 	"strings"
 
-	adapters "github.com/Dreamacro/clash/adapters/outbound"
-	"github.com/Dreamacro/clash/common/structure"
+	"github.com/Dreamacro/clash/adapters/outbound"
+	"github.com/Dreamacro/clash/adapters/outboundgroup"
+	"github.com/Dreamacro/clash/adapters/provider"
 	"github.com/Dreamacro/clash/component/auth"
 	trie "github.com/Dreamacro/clash/component/domain-trie"
 	"github.com/Dreamacro/clash/component/fakeip"
@@ -31,7 +31,7 @@ type General struct {
 	Authentication     []string     `json:"authentication"`
 	AllowLan           bool         `json:"allow-lan"`
 	BindAddress        string       `json:"bind-address"`
-	Mode               T.Mode       `json:"mode"`
+	Mode               T.TunnelMode `json:"mode"`
 	LogLevel           log.LogLevel `json:"log-level"`
 	ExternalController string       `json:"-"`
 	ExternalUI         string       `json:"-"`
@@ -40,14 +40,15 @@ type General struct {
 
 // DNS config
 type DNS struct {
-	Enable         bool             `yaml:"enable"`
-	IPv6           bool             `yaml:"ipv6"`
-	NameServer     []dns.NameServer `yaml:"nameserver"`
-	Fallback       []dns.NameServer `yaml:"fallback"`
-	FallbackFilter FallbackFilter   `yaml:"fallback-filter"`
-	Listen         string           `yaml:"listen"`
-	EnhancedMode   dns.EnhancedMode `yaml:"enhanced-mode"`
-	FakeIPRange    *fakeip.Pool
+	Enable            bool             `yaml:"enable"`
+	IPv6              bool             `yaml:"ipv6"`
+	NameServer        []dns.NameServer `yaml:"nameserver"`
+	Fallback          []dns.NameServer `yaml:"fallback"`
+	FallbackFilter    FallbackFilter   `yaml:"fallback-filter"`
+	Listen            string           `yaml:"listen"`
+	EnhancedMode      dns.EnhancedMode `yaml:"enhanced-mode"`
+	DefaultNameserver []dns.NameServer `yaml:"default-nameserver"`
+	FakeIPRange       *fakeip.Pool
 }
 
 // FallbackFilter config
@@ -58,7 +59,8 @@ type FallbackFilter struct {
 
 // Experimental config
 type Experimental struct {
-	IgnoreResolveFail bool `yaml:"ignore-resolve-fail"`
+	IgnoreResolveFail bool   `yaml:"ignore-resolve-fail"`
+	Interface         string `yaml:"interface-name"`
 }
 
 // Config is clash config manager
@@ -70,79 +72,68 @@ type Config struct {
 	Rules        []C.Rule
 	Users        []auth.AuthUser
 	Proxies      map[string]C.Proxy
+	Providers    map[string]provider.ProxyProvider
 }
 
-type rawDNS struct {
-	Enable         bool              `yaml:"enable"`
-	IPv6           bool              `yaml:"ipv6"`
-	NameServer     []string          `yaml:"nameserver"`
-	Fallback       []string          `yaml:"fallback"`
-	FallbackFilter rawFallbackFilter `yaml:"fallback-filter"`
-	Listen         string            `yaml:"listen"`
-	EnhancedMode   dns.EnhancedMode  `yaml:"enhanced-mode"`
-	FakeIPRange    string            `yaml:"fake-ip-range"`
+type RawDNS struct {
+	Enable            bool              `yaml:"enable"`
+	IPv6              bool              `yaml:"ipv6"`
+	NameServer        []string          `yaml:"nameserver"`
+	Fallback          []string          `yaml:"fallback"`
+	FallbackFilter    RawFallbackFilter `yaml:"fallback-filter"`
+	Listen            string            `yaml:"listen"`
+	EnhancedMode      dns.EnhancedMode  `yaml:"enhanced-mode"`
+	FakeIPRange       string            `yaml:"fake-ip-range"`
+	FakeIPFilter      []string          `yaml:"fake-ip-filter"`
+	DefaultNameserver []string          `yaml:"default-nameserver"`
 }
 
-type rawFallbackFilter struct {
+type RawFallbackFilter struct {
 	GeoIP  bool     `yaml:"geoip"`
 	IPCIDR []string `yaml:"ipcidr"`
 }
 
-type rawConfig struct {
+type RawConfig struct {
 	Port               int          `yaml:"port"`
 	SocksPort          int          `yaml:"socks-port"`
 	RedirPort          int          `yaml:"redir-port"`
 	Authentication     []string     `yaml:"authentication"`
 	AllowLan           bool         `yaml:"allow-lan"`
 	BindAddress        string       `yaml:"bind-address"`
-	Mode               T.Mode       `yaml:"mode"`
+	Mode               T.TunnelMode `yaml:"mode"`
 	LogLevel           log.LogLevel `yaml:"log-level"`
 	ExternalController string       `yaml:"external-controller"`
 	ExternalUI         string       `yaml:"external-ui"`
 	Secret             string       `yaml:"secret"`
 
-	Hosts        map[string]string        `yaml:"hosts"`
-	DNS          rawDNS                   `yaml:"dns"`
-	Experimental Experimental             `yaml:"experimental"`
-	Proxy        []map[string]interface{} `yaml:"Proxy"`
-	ProxyGroup   []map[string]interface{} `yaml:"Proxy Group"`
-	Rule         []string                 `yaml:"Rule"`
+	ProxyProvider map[string]map[string]interface{} `yaml:"proxy-providers"`
+	Hosts         map[string]string                 `yaml:"hosts"`
+	DNS           RawDNS                            `yaml:"dns"`
+	Experimental  Experimental                      `yaml:"experimental"`
+	Proxy         []map[string]interface{}          `yaml:"proxies"`
+	ProxyGroup    []map[string]interface{}          `yaml:"proxy-groups"`
+	Rule          []string                          `yaml:"rules"`
+
+	// remove after 1.0
+	ProxyProviderOld map[string]map[string]interface{} `yaml:"proxy-provider"`
+	ProxyOld         []map[string]interface{}          `yaml:"Proxy"`
+	ProxyGroupOld    []map[string]interface{}          `yaml:"Proxy Group"`
+	RuleOld          []string                          `yaml:"Rule"`
 }
 
-// forward compatibility before 1.0
-func readRawConfig(path string) ([]byte, error) {
-	data, err := ioutil.ReadFile(path)
-	if err == nil && len(data) != 0 {
-		return data, nil
-	}
-
-	if filepath.Ext(path) != ".yaml" {
-		return nil, err
-	}
-
-	path = path[:len(path)-5] + ".yml"
-	if _, err = os.Stat(path); err == nil {
-		return ioutil.ReadFile(path)
-	}
-
-	return data, nil
-}
-
-func readConfig(path string) (*rawConfig, error) {
-	if _, err := os.Stat(path); os.IsNotExist(err) {
-		return nil, err
-	}
-	data, err := readRawConfig(path)
+// Parse config
+func Parse(buf []byte) (*Config, error) {
+	rawCfg, err := UnmarshalRawConfig(buf)
 	if err != nil {
 		return nil, err
 	}
 
-	if len(data) == 0 {
-		return nil, fmt.Errorf("Configuration file %s is empty", path)
-	}
+	return ParseRawConfig(rawCfg)
+}
 
+func UnmarshalRawConfig(buf []byte) (*RawConfig, error) {
 	// config with some default value
-	rawConfig := &rawConfig{
+	rawCfg := &RawConfig{
 		AllowLan:       false,
 		BindAddress:    "*",
 		Mode:           T.Rule,
@@ -155,27 +146,35 @@ func readConfig(path string) (*rawConfig, error) {
 		Experimental: Experimental{
 			IgnoreResolveFail: true,
 		},
-		DNS: rawDNS{
+		DNS: RawDNS{
 			Enable:      false,
 			FakeIPRange: "198.18.0.1/16",
-			FallbackFilter: rawFallbackFilter{
+			FallbackFilter: RawFallbackFilter{
 				GeoIP:  true,
 				IPCIDR: []string{},
 			},
+			DefaultNameserver: []string{
+				"114.114.114.114",
+				"8.8.8.8",
+			},
 		},
+
+		// remove after 1.0
+		RuleOld:       []string{},
+		ProxyOld:      []map[string]interface{}{},
+		ProxyGroupOld: []map[string]interface{}{},
 	}
-	err = yaml.Unmarshal([]byte(data), &rawConfig)
-	return rawConfig, err
-}
 
-// Parse config
-func Parse(path string) (*Config, error) {
-	config := &Config{}
-
-	rawCfg, err := readConfig(path)
-	if err != nil {
+	if err := yaml.Unmarshal(buf, &rawCfg); err != nil {
 		return nil, err
 	}
+
+	return rawCfg, nil
+}
+
+func ParseRawConfig(rawCfg *RawConfig) (*Config, error) {
+	config := &Config{}
+
 	config.Experimental = &rawCfg.Experimental
 
 	general, err := parseGeneral(rawCfg)
@@ -184,11 +183,12 @@ func Parse(path string) (*Config, error) {
 	}
 	config.General = general
 
-	proxies, err := parseProxies(rawCfg)
+	proxies, providers, err := parseProxies(rawCfg)
 	if err != nil {
 		return nil, err
 	}
 	config.Proxies = proxies
+	config.Providers = providers
 
 	rules, err := parseRules(rawCfg, proxies)
 	if err != nil {
@@ -213,7 +213,7 @@ func Parse(path string) (*Config, error) {
 	return config, nil
 }
 
-func parseGeneral(cfg *rawConfig) (*General, error) {
+func parseGeneral(cfg *RawConfig) (*General, error) {
 	port := cfg.Port
 	socksPort := cfg.SocksPort
 	redirPort := cfg.RedirPort
@@ -226,9 +226,7 @@ func parseGeneral(cfg *rawConfig) (*General, error) {
 	logLevel := cfg.LogLevel
 
 	if externalUI != "" {
-		if !filepath.IsAbs(externalUI) {
-			externalUI = filepath.Join(C.Path.HomeDir(), externalUI)
-		}
+		externalUI = C.Path.Resolve(externalUI)
 
 		if _, err := os.Stat(externalUI); os.IsNotExist(err) {
 			return nil, fmt.Errorf("external-ui: %s not exist", externalUI)
@@ -250,191 +248,148 @@ func parseGeneral(cfg *rawConfig) (*General, error) {
 	return general, nil
 }
 
-func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
-	proxies := make(map[string]C.Proxy)
+func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[string]provider.ProxyProvider, err error) {
+	proxies = make(map[string]C.Proxy)
+	providersMap = make(map[string]provider.ProxyProvider)
 	proxyList := []string{}
 	proxiesConfig := cfg.Proxy
 	groupsConfig := cfg.ProxyGroup
+	providersConfig := cfg.ProxyProvider
 
-	decoder := structure.NewDecoder(structure.Option{TagName: "proxy", WeaklyTypedInput: true})
+	if len(proxiesConfig) == 0 {
+		proxiesConfig = cfg.ProxyOld
+	}
 
-	proxies["DIRECT"] = adapters.NewProxy(adapters.NewDirect())
-	proxies["REJECT"] = adapters.NewProxy(adapters.NewReject())
+	if len(groupsConfig) == 0 {
+		groupsConfig = cfg.ProxyGroupOld
+	}
+
+	if len(providersConfig) == 0 {
+		providersConfig = cfg.ProxyProviderOld
+	}
+
+	proxies["DIRECT"] = outbound.NewProxy(outbound.NewDirect())
+	proxies["REJECT"] = outbound.NewProxy(outbound.NewReject())
 	proxyList = append(proxyList, "DIRECT", "REJECT")
 
 	// parse proxy
 	for idx, mapping := range proxiesConfig {
-		proxyType, existType := mapping["type"].(string)
-		if !existType {
-			return nil, fmt.Errorf("Proxy %d missing type", idx)
-		}
-
-		var proxy C.ProxyAdapter
-		err := fmt.Errorf("cannot parse")
-		switch proxyType {
-		case "ss":
-			ssOption := &adapters.ShadowSocksOption{}
-			err = decoder.Decode(mapping, ssOption)
-			if err != nil {
-				break
-			}
-			proxy, err = adapters.NewShadowSocks(*ssOption)
-		case "socks5":
-			socksOption := &adapters.Socks5Option{}
-			err = decoder.Decode(mapping, socksOption)
-			if err != nil {
-				break
-			}
-			proxy = adapters.NewSocks5(*socksOption)
-		case "http":
-			httpOption := &adapters.HttpOption{}
-			err = decoder.Decode(mapping, httpOption)
-			if err != nil {
-				break
-			}
-			proxy = adapters.NewHttp(*httpOption)
-		case "vmess":
-			vmessOption := &adapters.VmessOption{}
-			err = decoder.Decode(mapping, vmessOption)
-			if err != nil {
-				break
-			}
-			proxy, err = adapters.NewVmess(*vmessOption)
-		case "snell":
-			snellOption := &adapters.SnellOption{}
-			err = decoder.Decode(mapping, snellOption)
-			if err != nil {
-				break
-			}
-			proxy, err = adapters.NewSnell(*snellOption)
-		default:
-			return nil, fmt.Errorf("Unsupport proxy type: %s", proxyType)
-		}
-
+		proxy, err := outbound.ParseProxy(mapping)
 		if err != nil {
-			return nil, fmt.Errorf("Proxy [%d]: %s", idx, err.Error())
+			return nil, nil, fmt.Errorf("Proxy %d: %w", idx, err)
 		}
 
 		if _, exist := proxies[proxy.Name()]; exist {
-			return 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()] = adapters.NewProxy(proxy)
+		proxies[proxy.Name()] = proxy
 		proxyList = append(proxyList, proxy.Name())
 	}
 
-	// keep the origional order of ProxyGroups in config file
+	// keep the original order of ProxyGroups in config file
 	for idx, mapping := range groupsConfig {
 		groupName, existName := mapping["name"].(string)
 		if !existName {
-			return nil, fmt.Errorf("ProxyGroup %d: missing name", idx)
+			return nil, nil, fmt.Errorf("ProxyGroup %d: missing name", idx)
 		}
 		proxyList = append(proxyList, groupName)
 	}
 
 	// check if any loop exists and sort the ProxyGroups
-	if err := proxyGroupsDagSort(groupsConfig, decoder); err != nil {
-		return nil, err
+	if err := proxyGroupsDagSort(groupsConfig); err != nil {
+		return nil, nil, err
+	}
+
+	// parse and initial providers
+	for name, mapping := range providersConfig {
+		if name == provider.ReservedName {
+			return nil, nil, fmt.Errorf("can not defined a provider called `%s`", provider.ReservedName)
+		}
+
+		pd, err := provider.ParseProxyProvider(name, mapping)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		providersMap[name] = pd
+	}
+
+	for _, provider := range providersMap {
+		log.Infoln("Start initial provider %s", provider.Name())
+		if err := provider.Initial(); err != nil {
+			return nil, nil, err
+		}
 	}
 
 	// parse proxy group
-	for _, mapping := range groupsConfig {
-		groupType, existType := mapping["type"].(string)
-		groupName, _ := mapping["name"].(string)
-		if !existType {
-			return nil, fmt.Errorf("ProxyGroup %s: missing type", groupName)
-		}
-
-		if _, exist := proxies[groupName]; exist {
-			return nil, fmt.Errorf("ProxyGroup %s: the duplicate name", groupName)
-		}
-		var group C.ProxyAdapter
-		ps := []C.Proxy{}
-
-		err := fmt.Errorf("cannot parse")
-		switch groupType {
-		case "url-test":
-			urlTestOption := &adapters.URLTestOption{}
-			err = decoder.Decode(mapping, urlTestOption)
-			if err != nil {
-				break
-			}
-
-			ps, err = getProxies(proxies, urlTestOption.Proxies)
-			if err != nil {
-				return nil, fmt.Errorf("ProxyGroup %s: %s", groupName, err.Error())
-			}
-			group, err = adapters.NewURLTest(*urlTestOption, ps)
-		case "select":
-			selectorOption := &adapters.SelectorOption{}
-			err = decoder.Decode(mapping, selectorOption)
-			if err != nil {
-				break
-			}
-
-			ps, err = getProxies(proxies, selectorOption.Proxies)
-			if err != nil {
-				return nil, fmt.Errorf("ProxyGroup %s: %s", groupName, err.Error())
-			}
-			group, err = adapters.NewSelector(selectorOption.Name, ps)
-		case "fallback":
-			fallbackOption := &adapters.FallbackOption{}
-			err = decoder.Decode(mapping, fallbackOption)
-			if err != nil {
-				break
-			}
-
-			ps, err = getProxies(proxies, fallbackOption.Proxies)
-			if err != nil {
-				return nil, fmt.Errorf("ProxyGroup %s: %s", groupName, err.Error())
-			}
-			group, err = adapters.NewFallback(*fallbackOption, ps)
-		case "load-balance":
-			loadBalanceOption := &adapters.LoadBalanceOption{}
-			err = decoder.Decode(mapping, loadBalanceOption)
-			if err != nil {
-				break
-			}
-
-			ps, err = getProxies(proxies, loadBalanceOption.Proxies)
-			if err != nil {
-				return nil, fmt.Errorf("ProxyGroup %s: %s", groupName, err.Error())
-			}
-			group, err = adapters.NewLoadBalance(*loadBalanceOption, ps)
-		}
+	for idx, mapping := range groupsConfig {
+		group, err := outboundgroup.ParseProxyGroup(mapping, proxies, providersMap)
 		if err != nil {
-			return nil, fmt.Errorf("Proxy %s: %s", groupName, err.Error())
+			return nil, nil, fmt.Errorf("ProxyGroup[%d]: %w", idx, err)
+		}
+
+		groupName := group.Name()
+		if _, exist := proxies[groupName]; exist {
+			return nil, nil, fmt.Errorf("ProxyGroup %s: the duplicate name", groupName)
+		}
+
+		proxies[groupName] = outbound.NewProxy(group)
+	}
+
+	// initial compatible provider
+	for _, pd := range providersMap {
+		if pd.VehicleType() != provider.Compatible {
+			continue
+		}
+
+		log.Infoln("Start initial compatible provider %s", pd.Name())
+		if err := pd.Initial(); err != nil {
+			return nil, nil, err
 		}
-		proxies[groupName] = adapters.NewProxy(group)
 	}
 
 	ps := []C.Proxy{}
 	for _, v := range proxyList {
 		ps = append(ps, proxies[v])
 	}
+	hc := provider.NewHealthCheck(ps, "", 0)
+	pd, _ := provider.NewCompatibleProvider(provider.ReservedName, ps, hc)
+	providersMap[provider.ReservedName] = pd
 
-	global, _ := adapters.NewSelector("GLOBAL", ps)
-	proxies["GLOBAL"] = adapters.NewProxy(global)
-	return proxies, nil
+	global := outboundgroup.NewSelector("GLOBAL", []provider.ProxyProvider{pd})
+	proxies["GLOBAL"] = outbound.NewProxy(global)
+	return proxies, providersMap, nil
 }
 
-func parseRules(cfg *rawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
+func parseRules(cfg *RawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
 	rules := []C.Rule{}
 
 	rulesConfig := cfg.Rule
+
+	// remove after 1.0
+	if len(rulesConfig) == 0 {
+		rulesConfig = cfg.RuleOld
+	}
+
 	// parse rules
 	for idx, line := range rulesConfig {
 		rule := trimArr(strings.Split(line, ","))
 		var (
 			payload string
 			target  string
+			params  = []string{}
 		)
 
-		switch len(rule) {
-		case 2:
+		switch l := len(rule); {
+		case l == 2:
 			target = rule[1]
-		case 3:
+		case l == 3:
 			payload = rule[1]
 			target = rule[2]
+		case l >= 4:
+			payload = rule[1]
+			target = rule[2]
+			params = rule[3:]
 		default:
 			return nil, fmt.Errorf("Rules[%d] [%s] error: format invalid", idx, line)
 		}
@@ -444,7 +399,12 @@ func parseRules(cfg *rawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
 		}
 
 		rule = trimArr(rule)
-		var parsed C.Rule
+		params = trimArr(params)
+		var (
+			parseErr error
+			parsed   C.Rule
+		)
+
 		switch rule[0] {
 		case "DOMAIN":
 			parsed = R.NewDomain(payload, target)
@@ -453,35 +413,31 @@ func parseRules(cfg *rawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
 		case "DOMAIN-KEYWORD":
 			parsed = R.NewDomainKeyword(payload, target)
 		case "GEOIP":
-			parsed = R.NewGEOIP(payload, target)
+			noResolve := R.HasNoResolve(params)
+			parsed = R.NewGEOIP(payload, target, noResolve)
 		case "IP-CIDR", "IP-CIDR6":
-			if rule := R.NewIPCIDR(payload, target, false); rule != nil {
-				parsed = rule
-			}
+			noResolve := R.HasNoResolve(params)
+			parsed, parseErr = R.NewIPCIDR(payload, target, R.WithIPCIDRNoResolve(noResolve))
 		// deprecated when bump to 1.0
 		case "SOURCE-IP-CIDR":
 			fallthrough
 		case "SRC-IP-CIDR":
-			if rule := R.NewIPCIDR(payload, target, true); rule != nil {
-				parsed = rule
-			}
+			parsed, parseErr = R.NewIPCIDR(payload, target, R.WithIPCIDRSourceIP(true), R.WithIPCIDRNoResolve(true))
 		case "SRC-PORT":
-			if rule := R.NewPort(payload, target, true); rule != nil {
-				parsed = rule
-			}
+			parsed, parseErr = R.NewPort(payload, target, true)
 		case "DST-PORT":
-			if rule := R.NewPort(payload, target, false); rule != nil {
-				parsed = rule
-			}
+			parsed, parseErr = R.NewPort(payload, target, false)
 		case "MATCH":
 			fallthrough
 		// deprecated when bump to 1.0
 		case "FINAL":
 			parsed = R.NewMatch(target)
+		default:
+			parseErr = fmt.Errorf("unsupported rule type %s", rule[0])
 		}
 
-		if parsed == nil {
-			return nil, fmt.Errorf("Rules[%d] [%s] error: payload invalid", idx, line)
+		if parseErr != nil {
+			return nil, fmt.Errorf("Rules[%d] [%s] error: %s", idx, line, parseErr.Error())
 		}
 
 		rules = append(rules, parsed)
@@ -490,7 +446,7 @@ func parseRules(cfg *rawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
 	return rules, nil
 }
 
-func parseHosts(cfg *rawConfig) (*trie.Trie, error) {
+func parseHosts(cfg *RawConfig) (*trie.Trie, error) {
 	tree := trie.New()
 	if len(cfg.Hosts) != 0 {
 		for domain, ipStr := range cfg.Hosts {
@@ -535,20 +491,20 @@ func parseNameServer(servers []string) ([]dns.NameServer, error) {
 			return nil, fmt.Errorf("DNS NameServer[%d] format error: %s", idx, err.Error())
 		}
 
-		var host, dnsNetType string
+		var addr, dnsNetType string
 		switch u.Scheme {
 		case "udp":
-			host, err = hostWithDefaultPort(u.Host, "53")
+			addr, err = hostWithDefaultPort(u.Host, "53")
 			dnsNetType = "" // UDP
 		case "tcp":
-			host, err = hostWithDefaultPort(u.Host, "53")
+			addr, err = hostWithDefaultPort(u.Host, "53")
 			dnsNetType = "tcp" // TCP
 		case "tls":
-			host, err = hostWithDefaultPort(u.Host, "853")
+			addr, err = hostWithDefaultPort(u.Host, "853")
 			dnsNetType = "tcp-tls" // DNS over TLS
 		case "https":
 			clearURL := url.URL{Scheme: "https", Host: u.Host, Path: u.Path}
-			host = clearURL.String()
+			addr = clearURL.String()
 			dnsNetType = "https" // DNS over HTTPS
 		default:
 			return nil, fmt.Errorf("DNS NameServer[%d] unsupport scheme: %s", idx, u.Scheme)
@@ -562,7 +518,7 @@ func parseNameServer(servers []string) ([]dns.NameServer, error) {
 			nameservers,
 			dns.NameServer{
 				Net:  dnsNetType,
-				Addr: host,
+				Addr: addr,
 			},
 		)
 	}
@@ -583,7 +539,7 @@ func parseFallbackIPCIDR(ips []string) ([]*net.IPNet, error) {
 	return ipNets, nil
 }
 
-func parseDNS(cfg rawDNS) (*DNS, error) {
+func parseDNS(cfg RawDNS) (*DNS, error) {
 	if cfg.Enable && len(cfg.NameServer) == 0 {
 		return nil, fmt.Errorf("If DNS configuration is turned on, NameServer cannot be empty")
 	}
@@ -606,12 +562,36 @@ func parseDNS(cfg rawDNS) (*DNS, error) {
 		return nil, err
 	}
 
+	if len(cfg.DefaultNameserver) == 0 {
+		return nil, errors.New("default nameserver should have at least one nameserver")
+	}
+	if dnsCfg.DefaultNameserver, err = parseNameServer(cfg.DefaultNameserver); err != nil {
+		return nil, err
+	}
+	// check default nameserver is pure ip addr
+	for _, ns := range dnsCfg.DefaultNameserver {
+		host, _, err := net.SplitHostPort(ns.Addr)
+		if err != nil || net.ParseIP(host) == nil {
+			return nil, errors.New("default nameserver should be pure IP")
+		}
+	}
+
 	if cfg.EnhancedMode == dns.FAKEIP {
 		_, ipnet, err := net.ParseCIDR(cfg.FakeIPRange)
 		if err != nil {
 			return nil, err
 		}
-		pool, err := fakeip.New(ipnet, 1000)
+
+		var host *trie.Trie
+		// fake ip skip host filter
+		if len(cfg.FakeIPFilter) != 0 {
+			host = trie.New()
+			for _, domain := range cfg.FakeIPFilter {
+				host.Insert(domain, true)
+			}
+		}
+
+		pool, err := fakeip.New(ipnet, 1000, host)
 		if err != nil {
 			return nil, err
 		}

config/initial.go

@@ -1,53 +1,49 @@
 package config
 
 import (
-	"archive/tar"
-	"compress/gzip"
 	"fmt"
 	"io"
 	"net/http"
 	"os"
-	"strings"
 
+	"github.com/Dreamacro/clash/component/mmdb"
 	C "github.com/Dreamacro/clash/constant"
-
-	log "github.com/sirupsen/logrus"
+	"github.com/Dreamacro/clash/log"
 )
 
 func downloadMMDB(path string) (err error) {
-	resp, err := http.Get("http://geolite.maxmind.com/download/geoip/database/GeoLite2-Country.tar.gz")
+	resp, err := http.Get("https://github.com/Dreamacro/maxmind-geoip/releases/latest/download/Country.mmdb")
 	if err != nil {
 		return
 	}
 	defer resp.Body.Close()
 
-	gr, err := gzip.NewReader(resp.Body)
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0644)
 	if err != nil {
-		return
+		return err
 	}
-	defer gr.Close()
+	defer f.Close()
+	_, err = io.Copy(f, resp.Body)
 
-	tr := tar.NewReader(gr)
-	for {
-		h, err := tr.Next()
-		if err == io.EOF {
-			break
-		} else if err != nil {
-			return err
+	return err
+}
+
+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())
+		}
+	}
+
+	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())
 		}
 
-		if !strings.HasSuffix(h.Name, "GeoLite2-Country.mmdb") {
-			continue
-		}
-
-		f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0644)
-		if err != nil {
-			return err
-		}
-		defer f.Close()
-		_, err = io.Copy(f, tr)
-		if err != nil {
-			return err
+		if err := downloadMMDB(C.Path.MMDB()); err != nil {
+			return fmt.Errorf("Can't download MMDB: %s", err.Error())
 		}
 	}
 
@@ -65,17 +61,18 @@ func Init(dir string) error {
 
 	// initial config.yaml
 	if _, err := os.Stat(C.Path.Config()); os.IsNotExist(err) {
-		log.Info("Can't find config, create an empty file")
-		os.OpenFile(C.Path.Config(), os.O_CREATE|os.O_WRONLY, 0644)
+		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())
+		}
+		f.Write([]byte(`port: 7890`))
+		f.Close()
 	}
 
 	// initial mmdb
-	if _, err := os.Stat(C.Path.MMDB()); os.IsNotExist(err) {
-		log.Info("Can't find MMDB, start download")
-		err := downloadMMDB(C.Path.MMDB())
-		if err != nil {
-			return fmt.Errorf("Can't download MMDB: %s", err.Error())
-		}
+	if err := initMMDB(); err != nil {
+		return fmt.Errorf("Can't initial MMDB: %w", err)
 	}
 	return nil
 }

config/utils.go

@@ -4,9 +4,8 @@ import (
 	"fmt"
 	"strings"
 
-	adapters "github.com/Dreamacro/clash/adapters/outbound"
+	"github.com/Dreamacro/clash/adapters/outboundgroup"
 	"github.com/Dreamacro/clash/common/structure"
-	C "github.com/Dreamacro/clash/constant"
 )
 
 func trimArr(arr []string) (r []string) {
@@ -16,18 +15,6 @@ func trimArr(arr []string) (r []string) {
 	return
 }
 
-func getProxies(mapping map[string]C.Proxy, list []string) ([]C.Proxy, error) {
-	var ps []C.Proxy
-	for _, name := range list {
-		p, ok := mapping[name]
-		if !ok {
-			return nil, fmt.Errorf("'%s' not found", name)
-		}
-		ps = append(ps, p)
-	}
-	return ps, nil
-}
-
 func or(pointers ...*int) *int {
 	for _, p := range pointers {
 		if p != nil {
@@ -40,8 +27,7 @@ func or(pointers ...*int) *int {
 // 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.
-func proxyGroupsDagSort(groupsConfig []map[string]interface{}, decoder *structure.Decoder) error {
-
+func proxyGroupsDagSort(groupsConfig []map[string]interface{}) error {
 	type graphNode struct {
 		indegree int
 		// topological order
@@ -50,34 +36,36 @@ func proxyGroupsDagSort(groupsConfig []map[string]interface{}, decoder *structur
 		data map[string]interface{}
 		// `outdegree` and `from` are used in loop locating
 		outdegree int
+		option    *outboundgroup.GroupCommonOption
 		from      []string
 	}
 
+	decoder := structure.NewDecoder(structure.Option{TagName: "group", WeaklyTypedInput: true})
 	graph := make(map[string]*graphNode)
 
 	// Step 1.1 build dependency graph
 	for _, mapping := range groupsConfig {
-		option := &adapters.ProxyGroupOption{}
-		err := decoder.Decode(mapping, option)
-		groupName := option.Name
-		if err != nil {
-			return fmt.Errorf("ProxyGroup %s: %s", groupName, err.Error())
+		option := &outboundgroup.GroupCommonOption{}
+		if err := decoder.Decode(mapping, option); err != nil {
+			return fmt.Errorf("ProxyGroup %s: %s", option.Name, err.Error())
 		}
 
+		groupName := option.Name
 		if node, ok := graph[groupName]; ok {
 			if node.data != nil {
 				return fmt.Errorf("ProxyGroup %s: duplicate group name", groupName)
 			}
 			node.data = mapping
+			node.option = option
 		} else {
-			graph[groupName] = &graphNode{0, -1, mapping, 0, nil}
+			graph[groupName] = &graphNode{0, -1, mapping, 0, option, nil}
 		}
 
 		for _, proxy := range option.Proxies {
 			if node, ex := graph[proxy]; ex {
 				node.indegree++
 			} else {
-				graph[proxy] = &graphNode{1, -1, nil, 0, nil}
+				graph[proxy] = &graphNode{1, -1, nil, 0, nil, nil}
 			}
 		}
 	}
@@ -95,14 +83,19 @@ func proxyGroupsDagSort(groupsConfig []map[string]interface{}, decoder *structur
 	for ; len(queue) > 0; queue = queue[1:] {
 		name := queue[0]
 		node := graph[name]
-		if node.data != nil {
+		if node.option != nil {
 			index++
 			groupsConfig[len(groupsConfig)-index] = node.data
-			for _, proxy := range node.data["proxies"].([]interface{}) {
-				child := graph[proxy.(string)]
+			if len(node.option.Proxies) == 0 {
+				delete(graph, name)
+				continue
+			}
+
+			for _, proxy := range node.option.Proxies {
+				child := graph[proxy]
 				child.indegree--
 				if child.indegree == 0 {
-					queue = append(queue, proxy.(string))
+					queue = append(queue, proxy)
 				}
 			}
 		}
@@ -117,12 +110,17 @@ func proxyGroupsDagSort(groupsConfig []map[string]interface{}, decoder *structur
 	// if loop is detected, locate the loop and throw an error
 	// Step 2.1 rebuild the graph, fill `outdegree` and `from` filed
 	for name, node := range graph {
-		if node.data == nil {
+		if node.option == nil {
 			continue
 		}
-		for _, proxy := range node.data["proxies"].([]interface{}) {
+
+		if len(node.option.Proxies) == 0 {
+			continue
+		}
+
+		for _, proxy := range node.option.Proxies {
 			node.outdegree++
-			child := graph[proxy.(string)]
+			child := graph[proxy]
 			if child.from == nil {
 				child.from = make([]string, 0, child.indegree)
 			}

constant/adapters.go

@@ -10,15 +10,19 @@ import (
 // Adapter Type
 const (
 	Direct AdapterType = iota
-	Fallback
 	Reject
-	Selector
+
 	Shadowsocks
 	Snell
 	Socks5
 	Http
-	URLTest
 	Vmess
+	Trojan
+
+	Relay
+	Selector
+	Fallback
+	URLTest
 	LoadBalance
 )
 
@@ -53,16 +57,20 @@ type Conn interface {
 type PacketConn interface {
 	net.PacketConn
 	Connection
+	WriteWithMetadata(p []byte, metadata *Metadata) (n int, err error)
 }
 
 type ProxyAdapter interface {
 	Name() string
 	Type() AdapterType
+	StreamConn(c net.Conn, metadata *Metadata) (net.Conn, error)
 	DialContext(ctx context.Context, metadata *Metadata) (Conn, error)
-	DialUDP(metadata *Metadata) (PacketConn, net.Addr, error)
+	DialUDP(metadata *Metadata) (PacketConn, error)
 	SupportUDP() bool
-	Destroy()
 	MarshalJSON() ([]byte, error)
+	Addr() string
+	// Unwrap extracts the proxy from a proxy-group. It returns nil when nothing to extract.
+	Unwrap(metadata *Metadata) Proxy
 }
 
 type DelayHistory struct {
@@ -86,12 +94,9 @@ func (at AdapterType) String() string {
 	switch at {
 	case Direct:
 		return "Direct"
-	case Fallback:
-		return "Fallback"
 	case Reject:
 		return "Reject"
-	case Selector:
-		return "Selector"
+
 	case Shadowsocks:
 		return "Shadowsocks"
 	case Snell:
@@ -100,13 +105,41 @@ func (at AdapterType) String() string {
 		return "Socks5"
 	case Http:
 		return "Http"
-	case URLTest:
-		return "URLTest"
 	case Vmess:
 		return "Vmess"
+	case Trojan:
+		return "Trojan"
+
+	case Relay:
+		return "Relay"
+	case Selector:
+		return "Selector"
+	case Fallback:
+		return "Fallback"
+	case URLTest:
+		return "URLTest"
 	case LoadBalance:
 		return "LoadBalance"
+
 	default:
 		return "Unknown"
 	}
 }
+
+// UDPPacket contains the data of UDP packet, and offers control/info of UDP packet's source
+type UDPPacket interface {
+	// Data get the payload of UDP Packet
+	Data() []byte
+
+	// 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,
+	//   this is important when using Fake-IP.
+	WriteBack(b []byte, addr net.Addr) (n int, err error)
+
+	// Drop call after packet is used, could recycle buffer in this function.
+	Drop()
+
+	// LocalAddr returns the source IP/Port of packet
+	LocalAddr() net.Addr
+}

constant/metadata.go

@@ -1,7 +1,9 @@
 package constant
 
 import (
+	"encoding/json"
 	"net"
+	"strconv"
 )
 
 // Socks addr type
@@ -14,6 +16,7 @@ const (
 	UDP
 
 	HTTP Type = iota
+	HTTPCONNECT
 	SOCKS
 	REDIR
 )
@@ -27,24 +30,66 @@ func (n *NetWork) String() string {
 	return "udp"
 }
 
+func (n NetWork) MarshalJSON() ([]byte, error) {
+	return json.Marshal(n.String())
+}
+
 type Type int
 
+func (t Type) String() string {
+	switch t {
+	case HTTP:
+		return "HTTP"
+	case HTTPCONNECT:
+		return "HTTP Connect"
+	case SOCKS:
+		return "Socks5"
+	case REDIR:
+		return "Redir"
+	default:
+		return "Unknown"
+	}
+}
+
+func (t Type) MarshalJSON() ([]byte, error) {
+	return json.Marshal(t.String())
+}
+
 // Metadata is used to store connection address
 type Metadata struct {
-	NetWork  NetWork
-	Type     Type
-	SrcIP    *net.IP
-	DstIP    *net.IP
-	SrcPort  string
-	DstPort  string
-	AddrType int
-	Host     string
+	NetWork  NetWork `json:"network"`
+	Type     Type    `json:"type"`
+	SrcIP    net.IP  `json:"sourceIP"`
+	DstIP    net.IP  `json:"destinationIP"`
+	SrcPort  string  `json:"sourcePort"`
+	DstPort  string  `json:"destinationPort"`
+	AddrType int     `json:"-"`
+	Host     string  `json:"host"`
 }
 
 func (m *Metadata) RemoteAddress() string {
 	return net.JoinHostPort(m.String(), m.DstPort)
 }
 
+func (m *Metadata) SourceAddress() string {
+	return net.JoinHostPort(m.SrcIP.String(), m.SrcPort)
+}
+
+func (m *Metadata) Resolved() bool {
+	return m.DstIP != nil
+}
+
+func (m *Metadata) UDPAddr() *net.UDPAddr {
+	if m.NetWork != UDP || m.DstIP == nil {
+		return nil
+	}
+	port, _ := strconv.Atoi(m.DstPort)
+	return &net.UDPAddr{
+		IP:   m.DstIP,
+		Port: port,
+	}
+}
+
 func (m *Metadata) String() string {
 	if m.Host != "" {
 		return m.Host

constant/path.go

@@ -3,6 +3,7 @@ package constant
 import (
 	"os"
 	P "path"
+	"path/filepath"
 )
 
 const Name = "clash"
@@ -11,32 +12,47 @@ const Name = "clash"
 var Path *path
 
 type path struct {
-	homedir string
+	homeDir    string
+	configFile string
 }
 
 func init() {
-	homedir, err := os.UserHomeDir()
+	homeDir, err := os.UserHomeDir()
 	if err != nil {
-		homedir, _ = os.Getwd()
+		homeDir, _ = os.Getwd()
 	}
 
-	homedir = P.Join(homedir, ".config", Name)
-	Path = &path{homedir: homedir}
+	homeDir = P.Join(homeDir, ".config", Name)
+	Path = &path{homeDir: homeDir, configFile: "config.yaml"}
 }
 
 // SetHomeDir is used to set the configuration path
 func SetHomeDir(root string) {
-	Path = &path{homedir: root}
+	Path.homeDir = root
+}
+
+// SetConfig is used to set the configuration file
+func SetConfig(file string) {
+	Path.configFile = file
 }
 
 func (p *path) HomeDir() string {
-	return p.homedir
+	return p.homeDir
 }
 
 func (p *path) Config() string {
-	return P.Join(p.homedir, "config.yaml")
+	return p.configFile
+}
+
+// Resolve return a absolute path or a relative path with homedir
+func (p *path) Resolve(path string) string {
+	if !filepath.IsAbs(path) {
+		return filepath.Join(p.HomeDir(), path)
+	}
+
+	return path
 }
 
 func (p *path) MMDB() string {
-	return P.Join(p.homedir, "Country.mmdb")
+	return P.Join(p.homeDir, "Country.mmdb")
 }

constant/rule.go

@@ -24,7 +24,7 @@ func (rt RuleType) String() string {
 	case DomainKeyword:
 		return "DomainKeyword"
 	case GEOIP:
-		return "GEOIP"
+		return "GeoIP"
 	case IPCIDR:
 		return "IPCIDR"
 	case SrcIPCIDR:
@@ -34,7 +34,7 @@ func (rt RuleType) String() string {
 	case DstPort:
 		return "DstPort"
 	case MATCH:
-		return "MATCH"
+		return "Match"
 	default:
 		return "Unknown"
 	}
@@ -42,7 +42,8 @@ func (rt RuleType) String() string {
 
 type Rule interface {
 	RuleType() RuleType
-	IsMatch(metadata *Metadata) bool
+	Match(metadata *Metadata) bool
 	Adapter() string
 	Payload() string
+	NoResolveIP() bool
 }

constant/traffic.go

@@ -1,55 +0,0 @@
-package constant
-
-import (
-	"time"
-)
-
-type Traffic struct {
-	up        chan int64
-	down      chan int64
-	upCount   int64
-	downCount int64
-	upTotal   int64
-	downTotal int64
-	interval  time.Duration
-}
-
-func (t *Traffic) Up() chan<- int64 {
-	return t.up
-}
-
-func (t *Traffic) Down() chan<- int64 {
-	return t.down
-}
-
-func (t *Traffic) Now() (up int64, down int64) {
-	return t.upTotal, t.downTotal
-}
-
-func (t *Traffic) handle() {
-	go t.handleCh(t.up, &t.upCount, &t.upTotal)
-	go t.handleCh(t.down, &t.downCount, &t.downTotal)
-}
-
-func (t *Traffic) handleCh(ch <-chan int64, count *int64, total *int64) {
-	ticker := time.NewTicker(t.interval)
-	for {
-		select {
-		case n := <-ch:
-			*count += n
-		case <-ticker.C:
-			*total = *count
-			*count = 0
-		}
-	}
-}
-
-func NewTraffic(interval time.Duration) *Traffic {
-	t := &Traffic{
-		up:       make(chan int64),
-		down:     make(chan int64),
-		interval: interval,
-	}
-	go t.handle()
-	return t
-}

dns/client.go

@@ -2,13 +2,20 @@ package dns
 
 import (
 	"context"
+	"fmt"
+	"net"
+	"strings"
+
+	"github.com/Dreamacro/clash/component/dialer"
 
 	D "github.com/miekg/dns"
 )
 
 type client struct {
 	*D.Client
-	Address string
+	r    *Resolver
+	port string
+	host string
 }
 
 func (c *client) Exchange(m *D.Msg) (msg *D.Msg, err error) {
@@ -16,6 +23,50 @@ func (c *client) Exchange(m *D.Msg) (msg *D.Msg, err error) {
 }
 
 func (c *client) ExchangeContext(ctx context.Context, m *D.Msg) (msg *D.Msg, err error) {
-	msg, _, err = c.Client.ExchangeContext(ctx, m, c.Address)
-	return
+	var ip net.IP
+	if c.r == nil {
+		// a default ip dns
+		ip = net.ParseIP(c.host)
+	} else {
+		var err error
+		if ip, err = c.r.ResolveIP(c.host); err != nil {
+			return nil, fmt.Errorf("use default dns resolve failed: %w", err)
+		}
+	}
+
+	d, err := dialer.Dialer()
+	if err != nil {
+		return nil, err
+	}
+
+	if dialer.DialHook != nil {
+		network := "udp"
+		if strings.HasPrefix(c.Client.Net, "tcp") {
+			network = "tcp"
+		}
+		if err := dialer.DialHook(d, network, ip); err != nil {
+			return nil, err
+		}
+	}
+
+	c.Client.Dialer = d
+
+	// miekg/dns ExchangeContext doesn't respond to context cancel.
+	// this is a workaround
+	type result struct {
+		msg *D.Msg
+		err error
+	}
+	ch := make(chan result, 1)
+	go func() {
+		msg, _, err := c.Client.Exchange(m, net.JoinHostPort(ip.String(), c.port))
+		ch <- result{msg, err}
+	}()
+
+	select {
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	case ret := <-ch:
+		return ret.msg, ret.err
+	}
 }

dns/doh.go

@@ -5,25 +5,22 @@ import (
 	"context"
 	"crypto/tls"
 	"io/ioutil"
+	"net"
 	"net/http"
 
+	"github.com/Dreamacro/clash/component/dialer"
+
 	D "github.com/miekg/dns"
 )
 
 const (
 	// dotMimeType is the DoH mimetype that should be used.
 	dotMimeType = "application/dns-message"
-
-	// dotPath is the URL path that should be used.
-	dotPath = "/dns-query"
 )
 
-var dohTransport = &http.Transport{
-	TLSClientConfig: &tls.Config{ClientSessionCache: globalSessionCache},
-}
-
 type dohClient struct {
-	url string
+	url       string
+	transport *http.Transport
 }
 
 func (dc *dohClient) Exchange(m *D.Msg) (msg *D.Msg, err error) {
@@ -58,7 +55,7 @@ func (dc *dohClient) newRequest(m *D.Msg) (*http.Request, error) {
 }
 
 func (dc *dohClient) doRequest(req *http.Request) (msg *D.Msg, err error) {
-	client := &http.Client{Transport: dohTransport}
+	client := &http.Client{Transport: dc.transport}
 	resp, err := client.Do(req)
 	if err != nil {
 		return nil, err
@@ -73,3 +70,25 @@ func (dc *dohClient) doRequest(req *http.Request) (msg *D.Msg, err error) {
 	err = msg.Unpack(buf)
 	return msg, err
 }
+
+func newDoHClient(url string, r *Resolver) *dohClient {
+	return &dohClient{
+		url: url,
+		transport: &http.Transport{
+			TLSClientConfig: &tls.Config{ClientSessionCache: globalSessionCache},
+			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+				host, port, err := net.SplitHostPort(addr)
+				if err != nil {
+					return nil, err
+				}
+
+				ip, err := r.ResolveIPv4(host)
+				if err != nil {
+					return nil, err
+				}
+
+				return dialer.DialContext(ctx, "tcp4", net.JoinHostPort(ip.String(), port))
+			},
+		},
+	}
+}

dns/filters.go

@@ -1,6 +1,10 @@
 package dns
 
-import "net"
+import (
+	"net"
+
+	"github.com/Dreamacro/clash/component/mmdb"
+)
 
 type fallbackFilter interface {
 	Match(net.IP) bool
@@ -9,12 +13,8 @@ type fallbackFilter interface {
 type geoipFilter struct{}
 
 func (gf *geoipFilter) Match(ip net.IP) bool {
-	if mmdb == nil {
-		return false
-	}
-
-	record, _ := mmdb.Country(ip)
-	return record.Country.IsoCode == "CN" || record.Country.IsoCode == ""
+	record, _ := mmdb.Instance().Country(ip)
+	return record.Country.IsoCode != "CN" && record.Country.IsoCode != ""
 }
 
 type ipnetFilter struct {

dns/middleware.go

@@ -18,7 +18,14 @@ func withFakeIP(fakePool *fakeip.Pool) middleware {
 			q := r.Question[0]
 
 			if q.Qtype == D.TypeAAAA {
-				D.HandleFailed(w, r)
+				msg := &D.Msg{}
+				msg.Answer = []D.RR{}
+
+				msg.SetRcode(r, D.RcodeSuccess)
+				msg.Authoritative = true
+				msg.RecursionAvailable = true
+
+				w.WriteMsg(msg)
 				return
 			} else if q.Qtype != D.TypeA {
 				next(w, r)
@@ -26,6 +33,10 @@ func withFakeIP(fakePool *fakeip.Pool) middleware {
 			}
 
 			host := strings.TrimRight(q.Name, ".")
+			if fakePool.LookupHost(host) {
+				next(w, r)
+				return
+			}
 
 			rr := &D.A{}
 			rr.Hdr = D.RR_Header{Name: q.Name, Rrtype: D.TypeA, Class: D.ClassINET, Ttl: dnsDefaultTTL}
@@ -35,7 +46,10 @@ func withFakeIP(fakePool *fakeip.Pool) middleware {
 			msg.Answer = []D.RR{rr}
 
 			setMsgTTL(msg, 1)
-			msg.SetReply(r)
+			msg.SetRcode(r, D.RcodeSuccess)
+			msg.Authoritative = true
+			msg.RecursionAvailable = true
+
 			w.WriteMsg(msg)
 			return
 		}
@@ -51,7 +65,8 @@ func withResolver(resolver *Resolver) handler {
 			D.HandleFailed(w, r)
 			return
 		}
-		msg.SetReply(r)
+		msg.SetRcode(r, msg.Rcode)
+		msg.Authoritative = true
 		w.WriteMsg(msg)
 		return
 	}
@@ -71,7 +86,7 @@ func compose(middlewares []middleware, endpoint handler) handler {
 func newHandler(resolver *Resolver) handler {
 	middlewares := []middleware{}
 
-	if resolver.IsFakeIP() {
+	if resolver.FakeIPEnabled() {
 		middlewares = append(middlewares, withFakeIP(resolver.pool))
 	}
 

dns/resolver.go

@@ -4,38 +4,26 @@ import (
 	"context"
 	"crypto/tls"
 	"errors"
+	"fmt"
+	"math/rand"
 	"net"
 	"strings"
-	"sync"
 	"time"
 
 	"github.com/Dreamacro/clash/common/cache"
 	"github.com/Dreamacro/clash/common/picker"
-	trie "github.com/Dreamacro/clash/component/domain-trie"
 	"github.com/Dreamacro/clash/component/fakeip"
-	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/component/resolver"
 
 	D "github.com/miekg/dns"
-	geoip2 "github.com/oschwald/geoip2-golang"
 	"golang.org/x/sync/singleflight"
 )
 
-var (
-	// DefaultResolver aim to resolve ip
-	DefaultResolver *Resolver
-
-	// DefaultHosts aim to resolve hosts
-	DefaultHosts = trie.New()
-)
-
 var (
 	globalSessionCache = tls.NewLRUClientSessionCache(64)
-
-	mmdb *geoip2.Reader
-	once sync.Once
 )
 
-type resolver interface {
+type dnsClient interface {
 	Exchange(m *D.Msg) (msg *D.Msg, err error)
 	ExchangeContext(ctx context.Context, m *D.Msg) (msg *D.Msg, err error)
 }
@@ -50,36 +38,33 @@ type Resolver struct {
 	mapping         bool
 	fakeip          bool
 	pool            *fakeip.Pool
-	main            []resolver
-	fallback        []resolver
+	main            []dnsClient
+	fallback        []dnsClient
 	fallbackFilters []fallbackFilter
 	group           singleflight.Group
-	cache           *cache.Cache
+	lruCache        *cache.LruCache
 }
 
-// ResolveIP request with TypeA and TypeAAAA, priority return TypeAAAA
+// ResolveIP request with TypeA and TypeAAAA, priority return TypeA
 func (r *Resolver) ResolveIP(host string) (ip net.IP, err error) {
-	ch := make(chan net.IP)
+	ch := make(chan net.IP, 1)
 	go func() {
 		defer close(ch)
-		ip, err := r.resolveIP(host, D.TypeA)
+		ip, err := r.resolveIP(host, D.TypeAAAA)
 		if err != nil {
 			return
 		}
 		ch <- ip
 	}()
 
-	ip, err = r.resolveIP(host, D.TypeAAAA)
+	ip, err = r.resolveIP(host, D.TypeA)
 	if err == nil {
-		go func() {
-			<-ch
-		}()
 		return
 	}
 
 	ip, open := <-ch
 	if !open {
-		return nil, errIPNotFound
+		return nil, resolver.ErrIPNotFound
 	}
 
 	return ip, nil
@@ -111,31 +96,43 @@ func (r *Resolver) Exchange(m *D.Msg) (msg *D.Msg, err error) {
 	}
 
 	q := m.Question[0]
-	cache, expireTime := r.cache.GetWithExpire(q.String())
-	if cache != nil {
+	cache, expireTime, hit := r.lruCache.GetWithExpire(q.String())
+	if hit {
+		now := time.Now()
 		msg = cache.(*D.Msg).Copy()
-		setMsgTTL(msg, uint32(expireTime.Sub(time.Now()).Seconds()))
+		if expireTime.Before(now) {
+			setMsgTTL(msg, uint32(1)) // Continue fetch
+			go r.exchangeWithoutCache(m)
+		} else {
+			setMsgTTL(msg, uint32(expireTime.Sub(time.Now()).Seconds()))
+		}
 		return
 	}
+	return r.exchangeWithoutCache(m)
+}
+
+// ExchangeWithoutCache a batch of dns request, and it do NOT GET from cache
+func (r *Resolver) exchangeWithoutCache(m *D.Msg) (msg *D.Msg, err error) {
+	q := m.Question[0]
+
 	defer func() {
 		if msg == nil {
 			return
 		}
 
-		putMsgToCache(r.cache, q.String(), msg)
+		putMsgToCache(r.lruCache, q.String(), msg)
 		if r.mapping {
 			ips := r.msgToIP(msg)
 			for _, ip := range ips {
-				putMsgToCache(r.cache, ip.String(), msg)
+				putMsgToCache(r.lruCache, ip.String(), msg)
 			}
 		}
 	}()
 
-	ret, err, _ := r.group.Do(q.String(), func() (interface{}, error) {
+	ret, err, shared := r.group.Do(q.String(), func() (interface{}, error) {
 		isIPReq := isIPRequest(q)
 		if isIPReq {
-			msg, err := r.fallbackExchange(m)
-			return msg, err
+			return r.fallbackExchange(m)
 		}
 
 		return r.batchExchange(r.main, m)
@@ -143,6 +140,9 @@ func (r *Resolver) Exchange(m *D.Msg) (msg *D.Msg, err error) {
 
 	if err == nil {
 		msg = ret.(*D.Msg)
+		if shared {
+			msg = msg.Copy()
+		}
 	}
 
 	return
@@ -154,7 +154,7 @@ func (r *Resolver) IPToHost(ip net.IP) (string, bool) {
 		return r.pool.LookBack(ip)
 	}
 
-	cache := r.cache.Get(ip.String())
+	cache, _ := r.lruCache.Get(ip.String())
 	if cache == nil {
 		return "", false
 	}
@@ -166,26 +166,41 @@ func (r *Resolver) IsMapping() bool {
 	return r.mapping
 }
 
-func (r *Resolver) IsFakeIP() bool {
+// FakeIPEnabled returns if fake-ip is enabled
+func (r *Resolver) FakeIPEnabled() bool {
 	return r.fakeip
 }
 
-func (r *Resolver) batchExchange(clients []resolver, m *D.Msg) (msg *D.Msg, err error) {
-	fast, ctx := picker.WithTimeout(context.Background(), time.Second)
+// IsFakeIP determine if given ip is a fake-ip
+func (r *Resolver) IsFakeIP(ip net.IP) bool {
+	if r.FakeIPEnabled() {
+		return r.pool.Exist(ip)
+	}
+	return false
+}
+
+func (r *Resolver) batchExchange(clients []dnsClient, m *D.Msg) (msg *D.Msg, err error) {
+	fast, ctx := picker.WithTimeout(context.Background(), time.Second*5)
 	for _, client := range clients {
 		r := client
 		fast.Go(func() (interface{}, error) {
-			msg, err := r.ExchangeContext(ctx, m)
-			if err != nil || msg.Rcode != D.RcodeSuccess {
-				return nil, errors.New("resolve error")
+			m, err := r.ExchangeContext(ctx, m)
+			if err != nil {
+				return nil, err
+			} else if m.Rcode == D.RcodeServerFailure || m.Rcode == D.RcodeRefused {
+				return nil, errors.New("server failure")
 			}
-			return msg, nil
+			return m, nil
 		})
 	}
 
 	elm := fast.Wait()
 	if elm == nil {
-		return nil, errors.New("All DNS requests failed")
+		err := errors.New("All DNS requests failed")
+		if fErr := fast.Error(); fErr != nil {
+			err = fmt.Errorf("%w, first error: %s", err, fErr.Error())
+		}
+		return nil, err
 	}
 
 	msg = elm.(*D.Msg)
@@ -203,9 +218,9 @@ func (r *Resolver) fallbackExchange(m *D.Msg) (msg *D.Msg, err error) {
 	res := <-msgCh
 	if res.Error == nil {
 		if ips := r.msgToIP(res.Msg); len(ips) != 0 {
-			if r.shouldFallback(ips[0]) {
-				go func() { <-fallbackMsg }()
+			if !r.shouldFallback(ips[0]) {
 				msg = res.Msg
+				err = res.Error
 				return msg, err
 			}
 		}
@@ -224,6 +239,8 @@ func (r *Resolver) resolveIP(host string, dnsType uint16) (ip net.IP, err error)
 			return ip, nil
 		} else if dnsType == D.TypeA && isIPv4 {
 			return ip, nil
+		} else {
+			return nil, resolver.ErrIPVersion
 		}
 	}
 
@@ -236,11 +253,12 @@ func (r *Resolver) resolveIP(host string, dnsType uint16) (ip net.IP, err error)
 	}
 
 	ips := r.msgToIP(msg)
-	if len(ips) == 0 {
-		return nil, errIPNotFound
+	ipLength := len(ips)
+	if ipLength == 0 {
+		return nil, resolver.ErrIPNotFound
 	}
 
-	ip = ips[0]
+	ip = ips[rand.Intn(ipLength)]
 	return
 }
 
@@ -259,8 +277,8 @@ func (r *Resolver) msgToIP(msg *D.Msg) []net.IP {
 	return ips
 }
 
-func (r *Resolver) asyncExchange(client []resolver, msg *D.Msg) <-chan *result {
-	ch := make(chan *result)
+func (r *Resolver) asyncExchange(client []dnsClient, msg *D.Msg) <-chan *result {
+	ch := make(chan *result, 1)
 	go func() {
 		res, err := r.batchExchange(client, msg)
 		ch <- &result{Msg: res, Error: err}
@@ -280,6 +298,7 @@ type FallbackFilter struct {
 
 type Config struct {
 	Main, Fallback []NameServer
+	Default        []NameServer
 	IPv6           bool
 	EnhancedMode   EnhancedMode
 	FallbackFilter FallbackFilter
@@ -287,25 +306,26 @@ type Config struct {
 }
 
 func New(config Config) *Resolver {
+	defaultResolver := &Resolver{
+		main:     transform(config.Default, nil),
+		lruCache: cache.NewLRUCache(cache.WithSize(4096), cache.WithStale(true)),
+	}
+
 	r := &Resolver{
-		ipv6:    config.IPv6,
-		main:    transform(config.Main),
-		cache:   cache.New(time.Second * 60),
-		mapping: config.EnhancedMode == MAPPING,
-		fakeip:  config.EnhancedMode == FAKEIP,
-		pool:    config.Pool,
+		ipv6:     config.IPv6,
+		main:     transform(config.Main, defaultResolver),
+		lruCache: cache.NewLRUCache(cache.WithSize(4096), cache.WithStale(true)),
+		mapping:  config.EnhancedMode == MAPPING,
+		fakeip:   config.EnhancedMode == FAKEIP,
+		pool:     config.Pool,
 	}
 
 	if len(config.Fallback) != 0 {
-		r.fallback = transform(config.Fallback)
+		r.fallback = transform(config.Fallback, defaultResolver)
 	}
 
 	fallbackFilters := []fallbackFilter{}
 	if config.FallbackFilter.GeoIP {
-		once.Do(func() {
-			mmdb, _ = geoip2.Open(C.Path.MMDB())
-		})
-
 		fallbackFilters = append(fallbackFilters, &geoipFilter{})
 	}
 	for _, ipnet := range config.FallbackFilter.IPCIDR {

dns/server.go

@@ -3,6 +3,8 @@ package dns
 import (
 	"net"
 
+	"github.com/Dreamacro/clash/common/sockopt"
+
 	D "github.com/miekg/dns"
 )
 
@@ -58,6 +60,11 @@ func ReCreateServer(addr string, resolver *Resolver) error {
 		return err
 	}
 
+	err = sockopt.UDPReuseaddr(p)
+	if err != nil {
+		return err
+	}
+
 	address = addr
 	handler := newHandler(resolver)
 	server = &Server{handler: handler}

dns/util.go

@@ -4,11 +4,11 @@ import (
 	"crypto/tls"
 	"encoding/json"
 	"errors"
+	"net"
 	"time"
 
 	"github.com/Dreamacro/clash/common/cache"
 	"github.com/Dreamacro/clash/log"
-	yaml "gopkg.in/yaml.v2"
 
 	D "github.com/miekg/dns"
 )
@@ -45,8 +45,8 @@ func (e *EnhancedMode) UnmarshalYAML(unmarshal func(interface{}) error) error {
 }
 
 // MarshalYAML serialize EnhancedMode with yaml
-func (e EnhancedMode) MarshalYAML() ([]byte, error) {
-	return yaml.Marshal(e.String())
+func (e EnhancedMode) MarshalYAML() (interface{}, error) {
+	return e.String(), nil
 }
 
 // UnmarshalJSON unserialize EnhancedMode with json
@@ -79,20 +79,21 @@ func (e EnhancedMode) String() string {
 	}
 }
 
-func putMsgToCache(c *cache.Cache, key string, msg *D.Msg) {
-	var ttl time.Duration
-	if len(msg.Answer) != 0 {
-		ttl = time.Duration(msg.Answer[0].Header().Ttl) * time.Second
-	} else if len(msg.Ns) != 0 {
-		ttl = time.Duration(msg.Ns[0].Header().Ttl) * time.Second
-	} else if len(msg.Extra) != 0 {
-		ttl = time.Duration(msg.Extra[0].Header().Ttl) * time.Second
-	} else {
+func putMsgToCache(c *cache.LruCache, key string, msg *D.Msg) {
+	var ttl uint32
+	switch {
+	case len(msg.Answer) != 0:
+		ttl = msg.Answer[0].Header().Ttl
+	case len(msg.Ns) != 0:
+		ttl = msg.Ns[0].Header().Ttl
+	case len(msg.Extra) != 0:
+		ttl = msg.Extra[0].Header().Ttl
+	default:
 		log.Debugln("[DNS] response msg error: %#v", msg)
 		return
 	}
 
-	c.Put(key, msg.Copy(), ttl)
+	c.SetWithExpire(key, msg.Copy(), time.Now().Add(time.Second*time.Duration(ttl)))
 }
 
 func setMsgTTL(msg *D.Msg, ttl uint32) {
@@ -116,14 +117,15 @@ func isIPRequest(q D.Question) bool {
 	return false
 }
 
-func transform(servers []NameServer) []resolver {
-	ret := []resolver{}
+func transform(servers []NameServer, resolver *Resolver) []dnsClient {
+	ret := []dnsClient{}
 	for _, s := range servers {
 		if s.Net == "https" {
-			ret = append(ret, &dohClient{url: s.Addr})
+			ret = append(ret, newDoHClient(s.Addr, resolver))
 			continue
 		}
 
+		host, port, _ := net.SplitHostPort(s.Addr)
 		ret = append(ret, &client{
 			Client: &D.Client{
 				Net: s.Net,
@@ -131,10 +133,14 @@ func transform(servers []NameServer) []resolver {
 					ClientSessionCache: globalSessionCache,
 					// alpn identifier, see https://tools.ietf.org/html/draft-hoffman-dprive-dns-tls-alpn-00#page-6
 					NextProtos: []string{"dns"},
+					ServerName: host,
 				},
 				UDPSize: 4096,
+				Timeout: 5 * time.Second,
 			},
-			Address: s.Addr,
+			port: port,
+			host: host,
+			r:    resolver,
 		})
 	}
 	return ret

go.mod

@@ -1,23 +1,22 @@
 module github.com/Dreamacro/clash
 
-go 1.13
+go 1.14
 
 require (
-	github.com/Dreamacro/go-shadowsocks2 v0.1.5-0.20191012162057-46254afc8b68
+	github.com/Dreamacro/go-shadowsocks2 v0.1.5
 	github.com/eapache/queue v1.1.0 // indirect
-	github.com/go-chi/chi v4.0.2+incompatible
-	github.com/go-chi/cors v1.0.0
+	github.com/go-chi/chi v4.1.1+incompatible
+	github.com/go-chi/cors v1.1.1
 	github.com/go-chi/render v1.0.1
-	github.com/gofrs/uuid v3.2.0+incompatible
-	github.com/gorilla/websocket v1.4.1
-	github.com/miekg/dns v1.1.22
-	github.com/oschwald/geoip2-golang v1.3.0
-	github.com/oschwald/maxminddb-golang v1.5.0 // indirect
-	github.com/sirupsen/logrus v1.4.2
-	github.com/stretchr/testify v1.4.0
-	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
-	golang.org/x/net v0.0.0-20191011234655-491137f69257
-	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
+	github.com/gofrs/uuid v3.3.0+incompatible
+	github.com/gorilla/websocket v1.4.2
+	github.com/miekg/dns v1.1.29
+	github.com/oschwald/geoip2-golang v1.4.0
+	github.com/sirupsen/logrus v1.6.0
+	github.com/stretchr/testify v1.5.1
+	golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79
+	golang.org/x/net v0.0.0-20200506145744-7e3656a0809f
+	golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a
 	gopkg.in/eapache/channels.v1 v1.1.0
-	gopkg.in/yaml.v2 v2.2.2
+	gopkg.in/yaml.v2 v2.2.8
 )

go.sum

@@ -1,73 +1,65 @@
-github.com/Dreamacro/go-shadowsocks2 v0.1.5-0.20191012162057-46254afc8b68 h1:UBDLpj1IGVkUcUBuZWE6DmZApPTZcnmcV6AfyDN/yhg=
-github.com/Dreamacro/go-shadowsocks2 v0.1.5-0.20191012162057-46254afc8b68/go.mod h1:Y8obOtHDOqxMGHjPglfCiXZBKExOA9VL6I6sJagOwYM=
-github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da h1:KjTM2ks9d14ZYCvmHS9iAKVt9AyzRSqNU1qabPih5BY=
-github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da/go.mod h1:eHEWzANqSiWQsof+nXEI9bUVUyV6F53Fp89EuCh2EAA=
+github.com/Dreamacro/go-shadowsocks2 v0.1.5 h1:BizWSjmwzAyQoslz6YhJYMiAGT99j9cnm9zlxVr+kyI=
+github.com/Dreamacro/go-shadowsocks2 v0.1.5/go.mod h1:LSXCjyHesPY3pLjhwff1mQX72ItcBT/N2xNC685cYeU=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/eapache/queue v1.1.0 h1:YOEu7KNc61ntiQlcEeUIoDTJ2o8mQznoNvUhiigpIqc=
 github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
-github.com/go-chi/chi v4.0.2+incompatible h1:maB6vn6FqCxrpz4FqWdh4+lwpyZIQS7YEAUcHlgXVRs=
-github.com/go-chi/chi v4.0.2+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
-github.com/go-chi/cors v1.0.0 h1:e6x8k7uWbUwYs+aXDoiUzeQFT6l0cygBYyNhD7/1Tg0=
-github.com/go-chi/cors v1.0.0/go.mod h1:K2Yje0VW/SJzxiyMYu6iPQYa7hMjQX2i/F491VChg1I=
+github.com/go-chi/chi v4.1.1+incompatible h1:MmTgB0R8Bt/jccxp+t6S/1VGIKdJw5J74CK/c9tTfA4=
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+github.com/go-chi/cors v1.1.1 h1:eHuqxsIw89iXcWnWUN8R72JMibABJTN/4IOYI5WERvw=
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 github.com/go-chi/render v1.0.1 h1:4/5tis2cKaNdnv9zFLfXzcquC9HbeZgCnxGnKrltBS8=
 github.com/go-chi/render v1.0.1/go.mod h1:pq4Rr7HbnsdaeHagklXub+p6Wd16Af5l9koip1OvJns=
-github.com/gofrs/uuid v3.2.0+incompatible h1:y12jRkkFxsd7GpqdSZ+/KCs/fJbqpEXSGd4+jfEaewE=
-github.com/gofrs/uuid v3.2.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
-github.com/gorilla/websocket v1.4.1 h1:q7AeDBpnBk8AogcD4DSag/Ukw/KV+YhzLj2bP5HvKCM=
-github.com/gorilla/websocket v1.4.1/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
-github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
-github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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-github.com/oschwald/geoip2-golang v1.3.0 h1:D+Hsdos1NARPbzZ2aInUHZL+dApIzo8E0ErJVsWcku8=
-github.com/oschwald/geoip2-golang v1.3.0/go.mod h1:0LTTzix/Ao1uMvOhAV4iLU0Lz7eCrP94qZWBTDKf0iE=
-github.com/oschwald/maxminddb-golang v1.5.0 h1:rmyoIV6z2/s9TCJedUuDiKht2RN12LWJ1L7iRGtWY64=
-github.com/oschwald/maxminddb-golang v1.5.0/go.mod h1:3jhIUymTJ5VREKyIhWm66LJiQt04F0UCDdodShpjWsY=
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 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
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-github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
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 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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 golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
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 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
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 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
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 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190922100055-0a153f010e69/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe h1:6fAMxZRR6sl1Uq8U61gxU+kPTs2tR8uOySCbBP7BN/M=
 golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20191224085550-c709ea063b76/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd h1:xhmwyvizuTgC2qz7ZlMluP20uW+C3Rm0FD/WLDX8884=
+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
-golang.org/x/text v0.3.2/go.mod h1:bEr9sfX3Q8Zfm5fL9x+3itogRgK3+ptLWKqgva+5dAk=
-golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
-golang.org/x/tools v0.0.0-20190907020128-2ca718005c18/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo=
-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/tools v0.0.0-20191216052735-49a3e744a425/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/eapache/channels.v1 v1.1.0 h1:5bGAyKKvyCTWjSj7mhefG6Lc68VyN4MH1v8/7OoeeB4=
 gopkg.in/eapache/channels.v1 v1.1.0/go.mod h1:BHIBujSvu9yMTrTYbTCjDD43gUhtmaOtTWDe7sTv1js=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

hooks/pre_build

@@ -0,0 +1,4 @@
+#!/bin/bash
+# Register qemu-*-static for all supported processors except the
+# current one, but also remove all registered binfmt_misc before
+docker run --rm --privileged multiarch/qemu-user-static:register --reset --credential yes

hub/executor/executor.go

@@ -1,17 +1,60 @@
 package executor
 
 import (
+	"fmt"
+	"io/ioutil"
+	"os"
+	"path/filepath"
+
+	"github.com/Dreamacro/clash/adapters/provider"
 	"github.com/Dreamacro/clash/component/auth"
+	"github.com/Dreamacro/clash/component/dialer"
 	trie "github.com/Dreamacro/clash/component/domain-trie"
+	"github.com/Dreamacro/clash/component/resolver"
 	"github.com/Dreamacro/clash/config"
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/dns"
 	"github.com/Dreamacro/clash/log"
 	P "github.com/Dreamacro/clash/proxy"
 	authStore "github.com/Dreamacro/clash/proxy/auth"
-	T "github.com/Dreamacro/clash/tunnel"
+	"github.com/Dreamacro/clash/tunnel"
 )
 
+// forward compatibility before 1.0
+func readRawConfig(path string) ([]byte, error) {
+	data, err := ioutil.ReadFile(path)
+	if err == nil && len(data) != 0 {
+		return data, nil
+	}
+
+	if filepath.Ext(path) != ".yaml" {
+		return nil, err
+	}
+
+	path = path[:len(path)-5] + ".yml"
+	if _, fallbackErr := os.Stat(path); fallbackErr == nil {
+		return ioutil.ReadFile(path)
+	}
+
+	return data, err
+}
+
+func readConfig(path string) ([]byte, error) {
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return nil, err
+	}
+	data, err := readRawConfig(path)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(data) == 0 {
+		return nil, fmt.Errorf("Configuration file %s is empty", path)
+	}
+
+	return data, err
+}
+
 // Parse config with default config path
 func Parse() (*config.Config, error) {
 	return ParseWithPath(C.Path.Config())
@@ -19,7 +62,17 @@ func Parse() (*config.Config, error) {
 
 // ParseWithPath parse config with custom config path
 func ParseWithPath(path string) (*config.Config, error) {
-	return config.Parse(path)
+	buf, err := readConfig(path)
+	if err != nil {
+		return nil, err
+	}
+
+	return ParseWithBytes(buf)
+}
+
+// ParseWithBytes config with buffer
+func ParseWithBytes(buf []byte) (*config.Config, error) {
+	return config.Parse(buf)
 }
 
 // ApplyConfig dispatch configure to all parts
@@ -28,11 +81,11 @@ func ApplyConfig(cfg *config.Config, force bool) {
 	if force {
 		updateGeneral(cfg.General)
 	}
-	updateProxies(cfg.Proxies)
+	updateProxies(cfg.Proxies, cfg.Providers)
 	updateRules(cfg.Rules)
 	updateDNS(cfg.DNS)
 	updateHosts(cfg.Hosts)
-	updateExperimental(cfg.Experimental)
+	updateExperimental(cfg)
 }
 
 func GetGeneral() *config.General {
@@ -49,20 +102,30 @@ func GetGeneral() *config.General {
 		Authentication: authenticator,
 		AllowLan:       P.AllowLan(),
 		BindAddress:    P.BindAddress(),
-		Mode:           T.Instance().Mode(),
+		Mode:           tunnel.Mode(),
 		LogLevel:       log.Level(),
 	}
 
 	return general
 }
 
-func updateExperimental(c *config.Experimental) {
-	T.Instance().UpdateExperimental(c.IgnoreResolveFail)
+func updateExperimental(c *config.Config) {
+	cfg := c.Experimental
+
+	tunnel.UpdateExperimental(cfg.IgnoreResolveFail)
+	if cfg.Interface != "" && c.DNS.Enable {
+		dialer.DialHook = dialer.DialerWithInterface(cfg.Interface)
+		dialer.ListenPacketHook = dialer.ListenPacketWithInterface(cfg.Interface)
+	} else {
+		dialer.DialHook = nil
+		dialer.ListenPacketHook = nil
+	}
 }
 
 func updateDNS(c *config.DNS) {
 	if c.Enable == false {
-		dns.DefaultResolver = nil
+		resolver.DefaultResolver = nil
+		tunnel.SetResolver(nil)
 		dns.ReCreateServer("", nil)
 		return
 	}
@@ -76,8 +139,10 @@ func updateDNS(c *config.DNS) {
 			GeoIP:  c.FallbackFilter.GeoIP,
 			IPCIDR: c.FallbackFilter.IPCIDR,
 		},
+		Default: c.DefaultNameserver,
 	})
-	dns.DefaultResolver = r
+	resolver.DefaultResolver = r
+	tunnel.SetResolver(r)
 	if err := dns.ReCreateServer(c.Listen, r); err != nil {
 		log.Errorln("Start DNS server error: %s", err.Error())
 		return
@@ -89,28 +154,20 @@ func updateDNS(c *config.DNS) {
 }
 
 func updateHosts(tree *trie.Trie) {
-	dns.DefaultHosts = tree
+	resolver.DefaultHosts = tree
 }
 
-func updateProxies(proxies map[string]C.Proxy) {
-	tunnel := T.Instance()
-	oldProxies := tunnel.Proxies()
-
-	// close proxy group goroutine
-	for _, proxy := range oldProxies {
-		proxy.Destroy()
-	}
-
-	tunnel.UpdateProxies(proxies)
+func updateProxies(proxies map[string]C.Proxy, providers map[string]provider.ProxyProvider) {
+	tunnel.UpdateProxies(proxies, providers)
 }
 
 func updateRules(rules []C.Rule) {
-	T.Instance().UpdateRules(rules)
+	tunnel.UpdateRules(rules)
 }
 
 func updateGeneral(general *config.General) {
 	log.SetLevel(general.LogLevel)
-	T.Instance().SetMode(general.Mode)
+	tunnel.SetMode(general.Mode)
 
 	allowLan := general.AllowLan
 	P.SetAllowLan(allowLan)

hub/hub.go

@@ -3,15 +3,40 @@ package hub
 import (
 	"github.com/Dreamacro/clash/hub/executor"
 	"github.com/Dreamacro/clash/hub/route"
+	"github.com/Dreamacro/clash/config"
 )
 
+type Option func(*config.Config)
+
+func WithExternalUI(externalUI string) Option {
+	return func(cfg *config.Config) {
+		cfg.General.ExternalUI = externalUI
+	}
+}
+
+func WithExternalController(externalController string) Option {
+	return func(cfg *config.Config) {
+		cfg.General.ExternalController = externalController
+	}
+}
+
+func WithSecret(secret string) Option {
+	return func(cfg *config.Config) {
+		cfg.General.Secret = secret
+	}
+}
+
 // Parse call at the beginning of clash
-func Parse() error {
+func Parse(options ...Option) error {
 	cfg, err := executor.Parse()
 	if err != nil {
 		return err
 	}
 
+	for _, option := range options {
+		option(cfg)
+	}
+
 	if cfg.General.ExternalUI != "" {
 		route.SetUIPath(cfg.General.ExternalUI)
 	}

hub/route/common.go

@@ -0,0 +1,17 @@
+package route
+
+import (
+	"net/http"
+	"net/url"
+
+	"github.com/go-chi/chi"
+)
+
+// When name is composed of a partial escape string, Golang does not unescape it
+func getEscapeParam(r *http.Request, paramName string) string {
+	param := chi.URLParam(r, paramName)
+	if newParam, err := url.PathUnescape(param); err == nil {
+		param = newParam
+	}
+	return param
+}

hub/route/configs.go

@@ -4,10 +4,11 @@ import (
 	"net/http"
 	"path/filepath"
 
+	"github.com/Dreamacro/clash/config"
 	"github.com/Dreamacro/clash/hub/executor"
 	"github.com/Dreamacro/clash/log"
 	P "github.com/Dreamacro/clash/proxy"
-	T "github.com/Dreamacro/clash/tunnel"
+	"github.com/Dreamacro/clash/tunnel"
 
 	"github.com/go-chi/chi"
 	"github.com/go-chi/render"
@@ -22,13 +23,13 @@ func configRouter() http.Handler {
 }
 
 type configSchema struct {
-	Port        *int          `json:"port"`
-	SocksPort   *int          `json:"socks-port"`
-	RedirPort   *int          `json:"redir-port"`
-	AllowLan    *bool         `json:"allow-lan"`
-	BindAddress *string       `json:"bind-address"`
-	Mode        *T.Mode       `json:"mode"`
-	LogLevel    *log.LogLevel `json:"log-level"`
+	Port        *int               `json:"port"`
+	SocksPort   *int               `json:"socks-port"`
+	RedirPort   *int               `json:"redir-port"`
+	AllowLan    *bool              `json:"allow-lan"`
+	BindAddress *string            `json:"bind-address"`
+	Mode        *tunnel.TunnelMode `json:"mode"`
+	LogLevel    *log.LogLevel      `json:"log-level"`
 }
 
 func getConfigs(w http.ResponseWriter, r *http.Request) {
@@ -66,7 +67,7 @@ func patchConfigs(w http.ResponseWriter, r *http.Request) {
 	P.ReCreateRedir(pointerOrDefault(general.RedirPort, ports.RedirPort))
 
 	if general.Mode != nil {
-		T.Instance().SetMode(*general.Mode)
+		tunnel.SetMode(*general.Mode)
 	}
 
 	if general.LogLevel != nil {
@@ -77,7 +78,8 @@ func patchConfigs(w http.ResponseWriter, r *http.Request) {
 }
 
 type updateConfigRequest struct {
-	Path string `json:"path"`
+	Path    string `json:"path"`
+	Payload string `json:"payload"`
 }
 
 func updateConfigs(w http.ResponseWriter, r *http.Request) {
@@ -88,18 +90,30 @@ func updateConfigs(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	if !filepath.IsAbs(req.Path) {
-		render.Status(r, http.StatusBadRequest)
-		render.JSON(w, r, newError("path is not a absoluted path"))
-		return
-	}
-
 	force := r.URL.Query().Get("force") == "true"
-	cfg, err := executor.ParseWithPath(req.Path)
-	if err != nil {
-		render.Status(r, http.StatusBadRequest)
-		render.JSON(w, r, newError(err.Error()))
-		return
+	var cfg *config.Config
+	var err error
+
+	if req.Payload != "" {
+		cfg, err = executor.ParseWithBytes([]byte(req.Payload))
+		if err != nil {
+			render.Status(r, http.StatusBadRequest)
+			render.JSON(w, r, newError(err.Error()))
+			return
+		}
+	} else {
+		if !filepath.IsAbs(req.Path) {
+			render.Status(r, http.StatusBadRequest)
+			render.JSON(w, r, newError("path is not a absoluted path"))
+			return
+		}
+
+		cfg, err = executor.ParseWithPath(req.Path)
+		if err != nil {
+			render.Status(r, http.StatusBadRequest)
+			render.JSON(w, r, newError(err.Error()))
+			return
+		}
 	}
 
 	executor.ApplyConfig(cfg, force)

hub/route/connections.go

@@ -0,0 +1,91 @@
+package route
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"strconv"
+	"time"
+
+	T "github.com/Dreamacro/clash/tunnel"
+	"github.com/gorilla/websocket"
+
+	"github.com/go-chi/chi"
+	"github.com/go-chi/render"
+)
+
+func connectionRouter() http.Handler {
+	r := chi.NewRouter()
+	r.Get("/", getConnections)
+	r.Delete("/", closeAllConnections)
+	r.Delete("/{id}", closeConnection)
+	return r
+}
+
+func getConnections(w http.ResponseWriter, r *http.Request) {
+	if !websocket.IsWebSocketUpgrade(r) {
+		snapshot := T.DefaultManager.Snapshot()
+		render.JSON(w, r, snapshot)
+		return
+	}
+
+	conn, err := upgrader.Upgrade(w, r, nil)
+	if err != nil {
+		return
+	}
+
+	intervalStr := r.URL.Query().Get("interval")
+	interval := 1000
+	if intervalStr != "" {
+		t, err := strconv.Atoi(intervalStr)
+		if err != nil {
+			render.Status(r, http.StatusBadRequest)
+			render.JSON(w, r, ErrBadRequest)
+			return
+		}
+
+		interval = t
+	}
+
+	buf := &bytes.Buffer{}
+	sendSnapshot := func() error {
+		buf.Reset()
+		snapshot := T.DefaultManager.Snapshot()
+		if err := json.NewEncoder(buf).Encode(snapshot); err != nil {
+			return err
+		}
+
+		return conn.WriteMessage(websocket.TextMessage, buf.Bytes())
+	}
+
+	if err := sendSnapshot(); err != nil {
+		return
+	}
+
+	tick := time.NewTicker(time.Millisecond * time.Duration(interval))
+	for range tick.C {
+		if err := sendSnapshot(); err != nil {
+			break
+		}
+	}
+}
+
+func closeConnection(w http.ResponseWriter, r *http.Request) {
+	id := chi.URLParam(r, "id")
+	snapshot := T.DefaultManager.Snapshot()
+	for _, c := range snapshot.Connections {
+		if id == c.ID() {
+			c.Close()
+			break
+		}
+	}
+	render.NoContent(w, r)
+}
+
+func closeAllConnections(w http.ResponseWriter, r *http.Request) {
+	snapshot := T.DefaultManager.Snapshot()
+	for _, c := range snapshot.Connections {
+		c.Close()
+	}
+	render.NoContent(w, r)
+}