Improve: UDP relay refactor (#441)

Co-authored-by: Dreamacro <Dreamacro@vip.qq.com>

.github/workflows/go.yml

@@ -0,0 +1,44 @@
+name: Go
+on: [push, pull_request]
+jobs:
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+      - name: Setup Go
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.13.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 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

.gitignore

@@ -4,6 +4,7 @@
 *.dll
 *.so
 *.dylib
+bin/*
 
 # Test binary, build with `go test -c`
 *.test
@@ -13,3 +14,9 @@
 
 # dep
 vendor
+
+# GoLand
+.idea/*
+
+# macOS file
+.DS_Store

.travis.yml

@@ -1,27 +0,0 @@
-language: go
-sudo: false
-go:
-  - "1.11"
-before_install:
-  - go get -u github.com/golang/dep/cmd/dep
-install:
-  - "$GOPATH/bin/dep ensure"
-env:
-  global:
-    - NAME=clash
-    - BINDIR=bin
-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

@@ -1,19 +1,18 @@
-FROM golang:latest as builder
-RUN wget http://geolite.maxmind.com/download/geoip/database/GeoLite2-Country.tar.gz -O /tmp/GeoLite2-Country.tar.gz && \
+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 && \
-    cp /tmp/GeoLite2-Country_*/GeoLite2-Country.mmdb /Country.mmdb
-RUN curl https://raw.githubusercontent.com/golang/dep/master/install.sh | sh && \
-    mkdir -p /go/src/github.com/Dreamacro/clash
-WORKDIR /go/src/github.com/Dreamacro/clash
-COPY . /go/src/github.com/Dreamacro/clash
-RUN dep ensure && \
-    GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -ldflags '-w -s' -o /clash && \
-    chmod +x /clash
+    mv /tmp/GeoLite2-Country_*/GeoLite2-Country.mmdb /Country.mmdb
+WORKDIR /clash-src
+COPY . /clash-src
+RUN go mod download && \
+    make linux-amd64 && \
+    mv ./bin/clash-linux-amd64 /clash
 
 FROM alpine:latest
-RUN apk --no-cache add ca-certificates && \
-    mkdir -p /root/.config/clash
+
+RUN apk add --no-cache ca-certificates
 COPY --from=builder /Country.mmdb /root/.config/clash/
-COPY --from=builder /clash .
-EXPOSE 7890 7891
+COPY --from=builder /clash /
 ENTRYPOINT ["/clash"]

Gopkg.lock

@@ -1,149 +0,0 @@
-# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
-
-
-[[projects]]
-  digest = "1:d21e998147c1c8cd727bd34148f373d3faa46fd8669c389b53c4eaabbe4eb2b3"
-  name = "github.com/Dreamacro/go-shadowsocks2"
-  packages = [
-    "core",
-    "shadowaead",
-    "shadowstream",
-    "socks",
-  ]
-  pruneopts = "UT"
-  revision = "1c1fd6c192eb76261ea3ccd80e3b141b25f20db4"
-  version = "v0.1.1"
-
-[[projects]]
-  branch = "master"
-  digest = "1:8fa55a6e302771a90a86ceae1ca3c0df4ef15d21092198e8313f61dde9eea963"
-  name = "github.com/Yawning/chacha20"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "e3b1f968fc6397b51d963fee8ec8711a47bc0ce8"
-
-[[projects]]
-  digest = "1:444b82bfe35c83bbcaf84e310fb81a1f9ece03edfed586483c869e2c046aef69"
-  name = "github.com/eapache/queue"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "44cc805cf13205b55f69e14bcb69867d1ae92f98"
-  version = "v1.1.0"
-
-[[projects]]
-  digest = "1:b9914f85d95a0968bafd1be1908ba29e2eafafd88d6fd13696be42bf5368c380"
-  name = "github.com/go-chi/chi"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "b5294d10673813fac8558e7f47242bc9e61b4c25"
-  version = "v3.3.3"
-
-[[projects]]
-  digest = "1:dfa416a1bb8139f30832543340f972f65c0db9932034cb6a1b42c5ac615a3fb8"
-  name = "github.com/go-chi/cors"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "dba6525398619dead495962a916728e7ee2ca322"
-  version = "v1.0.0"
-
-[[projects]]
-  digest = "1:54d7b4b9ab2bb2bae35b55eea900bc8fe15cba05a95fc78bf7fd7b82a9a07afa"
-  name = "github.com/go-chi/render"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "3215478343fbc559bd3fc08f7031bb134d6bdad5"
-  version = "v1.0.1"
-
-[[projects]]
-  digest = "1:ce579162ae1341f3e5ab30c0dce767f28b1eb6a81359aad01723f1ba6b4becdf"
-  name = "github.com/gofrs/uuid"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "370558f003bfe29580cd0f698d8640daccdcc45c"
-  version = "v3.1.1"
-
-[[projects]]
-  digest = "1:2e8bdbc8a11d716dab1bf66d326285d7e5c92fa4c996c1574ba1153e57534b85"
-  name = "github.com/oschwald/geoip2-golang"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "7118115686e16b77967cdbf55d1b944fe14ad312"
-  version = "v1.2.1"
-
-[[projects]]
-  digest = "1:07e8589503b7ec22430dae6eed6f2c17e4249ab245574f4fd0ba8fc9c597d138"
-  name = "github.com/oschwald/maxminddb-golang"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "c5bec84d1963260297932a1b7a1753c8420717a7"
-  version = "v1.3.0"
-
-[[projects]]
-  digest = "1:d867dfa6751c8d7a435821ad3b736310c2ed68945d05b50fb9d23aee0540c8cc"
-  name = "github.com/sirupsen/logrus"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "3e01752db0189b9157070a0e1668a620f9a85da2"
-  version = "v1.0.6"
-
-[[projects]]
-  branch = "master"
-  digest = "1:d33888518d56c3f0cc9009594f56be4faf33ffff358fe10ff8e7e8cccf0e6617"
-  name = "golang.org/x/crypto"
-  packages = [
-    "chacha20poly1305",
-    "hkdf",
-    "internal/chacha20",
-    "internal/subtle",
-    "poly1305",
-    "ssh/terminal",
-  ]
-  pruneopts = "UT"
-  revision = "0e37d006457bf46f9e6692014ba72ef82c33022c"
-
-[[projects]]
-  branch = "master"
-  digest = "1:ddbafa32d1899456edbf7a64aec7afe5aa287b840e6a12b996f8a8425c1d9a6a"
-  name = "golang.org/x/sys"
-  packages = [
-    "cpu",
-    "unix",
-    "windows",
-  ]
-  pruneopts = "UT"
-  revision = "d641721ec2dead6fe5ca284096fe4b1fcd49e427"
-
-[[projects]]
-  digest = "1:975a4480c40f2d0b95e1f83d3ec1aa29a2774e80179e08a9a4ba2aab86721b23"
-  name = "gopkg.in/eapache/channels.v1"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "47238d5aae8c0fefd518ef2bee46290909cf8263"
-  version = "v1.1.0"
-
-[[projects]]
-  digest = "1:5abd6a22805b1919f6a6bca0ae58b13cef1f3412812f38569978f43ef02743d4"
-  name = "gopkg.in/ini.v1"
-  packages = ["."]
-  pruneopts = "UT"
-  revision = "5cf292cae48347c2490ac1a58fe36735fb78df7e"
-  version = "v1.38.2"
-
-[solve-meta]
-  analyzer-name = "dep"
-  analyzer-version = 1
-  input-imports = [
-    "github.com/Dreamacro/go-shadowsocks2/core",
-    "github.com/Dreamacro/go-shadowsocks2/socks",
-    "github.com/go-chi/chi",
-    "github.com/go-chi/cors",
-    "github.com/go-chi/render",
-    "github.com/gofrs/uuid",
-    "github.com/oschwald/geoip2-golang",
-    "github.com/sirupsen/logrus",
-    "golang.org/x/crypto/chacha20poly1305",
-    "gopkg.in/eapache/channels.v1",
-    "gopkg.in/ini.v1",
-  ]
-  solver-name = "gps-cdcl"
-  solver-version = 1

Gopkg.toml

@@ -1,70 +0,0 @@
-# Gopkg.toml example
-#
-# Refer to https://golang.github.io/dep/docs/Gopkg.toml.html
-# for detailed Gopkg.toml documentation.
-#
-# required = ["github.com/user/thing/cmd/thing"]
-# ignored = ["github.com/user/project/pkgX", "bitbucket.org/user/project/pkgA/pkgY"]
-#
-# [[constraint]]
-#   name = "github.com/user/project"
-#   version = "1.0.0"
-#
-# [[constraint]]
-#   name = "github.com/user/project2"
-#   branch = "dev"
-#   source = "github.com/myfork/project2"
-#
-# [[override]]
-#   name = "github.com/x/y"
-#   version = "2.4.0"
-#
-# [prune]
-#   non-go = false
-#   go-tests = true
-#   unused-packages = true
-
-
-[[constraint]]
-  name = "github.com/Dreamacro/go-shadowsocks2"
-  version = "0.1.1"
-
-[[constraint]]
-  name = "github.com/go-chi/chi"
-  version = "3.3.3"
-
-[[constraint]]
-  name = "github.com/go-chi/cors"
-  version = "1.0.0"
-
-[[constraint]]
-  name = "github.com/go-chi/render"
-  version = "1.0.1"
-
-[[constraint]]
-  name = "github.com/gofrs/uuid"
-  version = "3.1.1"
-
-[[constraint]]
-  name = "github.com/oschwald/geoip2-golang"
-  version = "1.2.1"
-
-[[constraint]]
-  name = "github.com/sirupsen/logrus"
-  version = "1.0.6"
-
-[[constraint]]
-  branch = "master"
-  name = "golang.org/x/crypto"
-
-[[constraint]]
-  name = "gopkg.in/eapache/channels.v1"
-  version = "1.1.0"
-
-[[constraint]]
-  name = "gopkg.in/ini.v1"
-  version = "1.38.2"
-
-[prune]
-  go-tests = true
-  unused-packages = true

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
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
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+
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+<https://www.gnu.org/licenses/why-not-lgpl.html>.

Makefile

@@ -1,23 +1,97 @@
 NAME=clash
 BINDIR=bin
-GOBUILD=CGO_ENABLED=0 go build -ldflags '-w -s'
+VERSION=$(shell git describe --tags || echo "unknown version")
+BUILDTIME=$(shell date -u)
+GOBUILD=CGO_ENABLED=0 go build -ldflags '-X "github.com/Dreamacro/clash/constant.Version=$(VERSION)" \
+		-X "github.com/Dreamacro/clash/constant.BuildTime=$(BUILDTIME)" \
+		-w -s'
 
-all: linux macos win64
+PLATFORM_LIST = \
+	darwin-amd64 \
+	linux-386 \
+	linux-amd64 \
+	linux-armv5 \
+	linux-armv6 \
+	linux-armv7 \
+	linux-armv8 \
+	linux-mips-softfloat \
+	linux-mips-hardfloat \
+	linux-mipsle-softfloat \
+	linux-mipsle-hardfloat \
+	linux-mips64 \
+	linux-mips64le \
+	freebsd-386 \
+	freebsd-amd64
 
-linux:
-	GOARCH=amd64 GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+WINDOWS_ARCH_LIST = \
+	windows-386 \
+	windows-amd64
 
-macos:
+all: linux-amd64 darwin-amd64 windows-amd64 # Most used
+
+darwin-amd64:
 	GOARCH=amd64 GOOS=darwin $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
 
-win64:
+linux-386:
+	GOARCH=386 GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+linux-amd64:
+	GOARCH=amd64 GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+linux-armv5:
+	GOARCH=arm GOOS=linux GOARM=5 $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+linux-armv6:
+	GOARCH=arm GOOS=linux GOARM=6 $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+linux-armv7:
+	GOARCH=arm GOOS=linux GOARM=7 $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+linux-armv8:
+	GOARCH=arm64 GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+linux-mips-softfloat:
+	GOARCH=mips GOMIPS=softfloat GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+linux-mips-hardfloat:
+	GOARCH=mips GOMIPS=hardfloat GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+linux-mipsle-softfloat:
+	GOARCH=mipsle GOMIPS=softfloat GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+linux-mipsle-hardfloat:
+	GOARCH=mipsle GOMIPS=hardfloat GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+linux-mips64:
+	GOARCH=mips64 GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+linux-mips64le:
+	GOARCH=mips64le GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+freebsd-386:
+	GOARCH=386 GOOS=freebsd $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+freebsd-amd64:
+	GOARCH=amd64 GOOS=freebsd $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+
+windows-386:
+	GOARCH=386 GOOS=windows $(GOBUILD) -o $(BINDIR)/$(NAME)-$@.exe
+
+windows-amd64:
 	GOARCH=amd64 GOOS=windows $(GOBUILD) -o $(BINDIR)/$(NAME)-$@.exe
 
-releases: linux macos win64
-	chmod +x $(BINDIR)/$(NAME)-*
-	gzip $(BINDIR)/$(NAME)-linux
-	gzip $(BINDIR)/$(NAME)-macos
-	zip -m -j $(BINDIR)/$(NAME)-win64.zip $(BINDIR)/$(NAME)-win64.exe
+gz_releases=$(addsuffix .gz, $(PLATFORM_LIST))
+zip_releases=$(addsuffix .zip, $(WINDOWS_ARCH_LIST))
 
+$(gz_releases): %.gz : %
+	chmod +x $(BINDIR)/$(NAME)-$(basename $@)
+	gzip -f -S -$(VERSION).gz $(BINDIR)/$(NAME)-$(basename $@)
+
+$(zip_releases): %.zip : %
+	zip -m -j $(BINDIR)/$(NAME)-$(basename $@)-$(VERSION).zip $(BINDIR)/$(NAME)-$(basename $@).exe
+
+all-arch: $(PLATFORM_LIST) $(WINDOWS_ARCH_LIST)
+
+releases: $(gz_releases) $(zip_releases)
 clean:
 	rm $(BINDIR)/*

README.md

@@ -1,19 +1,16 @@
 <h1 align="center">
   <img src="https://github.com/Dreamacro/clash/raw/master/docs/logo.png" alt="Clash" width="200">
-  <br>
-  Clash
-  <br>
+  <br>Clash<br>
 </h1>
 
-<h4 align="center">A rule based proxy in Go.</h4>
+<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">
+    <img src="https://goreportcard.com/badge/github.com/Dreamacro/clash?style=flat-square">
   </a>
   <a href="https://github.com/Dreamacro/clash/releases">
     <img src="https://img.shields.io/github/release/Dreamacro/clash/all.svg?style=flat-square">
@@ -22,38 +19,38 @@
 
 ## Features
 
-- HTTP/HTTPS and SOCKS proxy
-- Surge like configuration
+- Local HTTP/HTTPS/SOCKS server
 - GeoIP rule support
-- Support Vmess/Shadowsocks/Socks5
-- Support for Netfilter TCP redirect
-
-## Discussion
-
-[Telegram Group](https://t.me/clash_discuss)
+- Supports Vmess, Shadowsocks, Snell and SOCKS5 protocol
+- Supports Netfilter TCP redirecting
+- Comprehensive HTTP API
 
 ## Install
 
-You can build from source:
+Clash Requires Go >= 1.13. You can build it from source:
 
 ```sh
-go get -u -v github.com/Dreamacro/clash
+$ go get -u -v github.com/Dreamacro/clash
 ```
 
-Pre-built binaries are available: [release](https://github.com/Dreamacro/clash/releases)
+Pre-built binaries are available here: [release](https://github.com/Dreamacro/clash/releases)
 
-Requires Go >= 1.10.
+Check Clash version with:
+
+```sh
+$ clash -v
+```
 
 ## Daemon
 
-Unfortunately, there is no native elegant way to implement golang's daemon.
+Unfortunately, there is no native and elegant way to implement daemons on Golang.
 
-So we can use third-party daemon tools like pm2, supervisor, and so on.
+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:
 
 ```sh
-pm2 start clash
+$ pm2 start clash
 ```
 
 If you have Docker installed, you can run clash directly using `docker-compose`.
@@ -62,53 +59,249 @@ If you have Docker installed, you can run clash directly using `docker-compose`.
 
 ## Config
 
-Configuration file at `$HOME/.config/clash/config.ini`
+The default configuration directory is `$HOME/.config/clash`.
 
-Below is a simple demo configuration file:
+The name of the configuration file is `config.yaml`.
 
-```ini
-[General]
-port = 7890
-socks-port = 7891
+If you want to use another directory, use `-d` to control the configuration directory.
 
-# redir proxy for Linux and macOS
-redir-port = 7892
+For example, you can use the current directory as the configuration directory:
 
-# A RESTful API for clash
-external-controller = 127.0.0.1:8080
-
-[Proxy]
-# name = ss, server, port, cipher, password(, obfs=tls/http, obfs-host=bing.com)
-# The types of cipher are consistent with go-shadowsocks2
-# support AEAD_AES_128_GCM AEAD_AES_192_GCM AEAD_AES_256_GCM AEAD_CHACHA20_POLY1305 AES-128-CTR AES-192-CTR AES-256-CTR AES-128-CFB AES-192-CFB AES-256-CFB CHACHA20-IETF XCHACHA20
-ss1 = ss, server1, port, AEAD_CHACHA20_POLY1305, password
-ss2 = ss, server2, port, AEAD_CHACHA20_POLY1305, password
-
-# name = vmess, server, port, uuid, alterId, cipher(, tls=true)
-# cipher support auto/aes-128-gcm/chacha20-poly1305/none
-vmess1 = vmess, server, port, uuid, 32, auto, tls=true
-
-# name = socks5, server, port
-socks = socks5, server, port
-
-[Proxy Group]
-# url-test select which proxy will be used by benchmarking speed to a URL.
-# name = url-test, [proxies], url, interval(second)
-auto = url-test, ss1, ss2, http://www.google.com/generate_204, 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 = select, [proxies]
-Proxy = select, ss1, ss2, auto
-
-[Rule]
-DOMAIN-SUFFIX,google.com,Proxy
-DOMAIN-KEYWORD,google,Proxy
-DOMAIN-SUFFIX,ad.com,REJECT
-GEOIP,CN,DIRECT
-FINAL,,Proxy # note: there is two ","
+```sh
+$ clash -d .
 ```
 
+<details>
+  <summary>This is an example configuration file (click to expand)</summary>
+
+```yml
+# port of HTTP
+port: 7890
+
+# port of SOCKS5
+socks-port: 7891
+
+# redir port for Linux and macOS
+# redir-port: 7892
+
+allow-lan: false
+
+# Only applicable when setting allow-lan to true
+# "*": bind all IP addresses
+# 192.168.122.11: bind a single IPv4 address
+# "[aaaa::a8aa:ff:fe09:57d8]": bind a single IPv6 address
+# bind-address: "*"
+
+# Rule / Global/ Direct (default is Rule)
+mode: Rule
+
+# set log level to stdout (default is info)
+# info / warning / error / debug / silent
+log-level: info
+
+# RESTful API for clash
+external-controller: 127.0.0.1:9090
+
+# you can put the static web resource (such as clash-dashboard) to a directory, and clash would serve in `${API}/ui`
+# input is a relative path to the configuration directory or an absolute path
+# external-ui: folder
+
+# Secret for RESTful API (Optional)
+# secret: ""
+
+# experimental feature
+experimental:
+  ignore-resolve-fail: true # ignore dns resolve fail, default value is true
+
+# authentication of local SOCKS5/HTTP(S) server
+# authentication:
+#  - "user1:pass1"
+#  - "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)
+# hosts:
+#   '*.clash.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
+  # enhanced-mode: redir-host # or fake-ip
+  # # fake-ip-range: 198.18.0.1/16 # if you don't know what it is, don't change it
+  # fake-ip-filter: # fake ip white domain list
+  #   - *.lan
+  #   - localhost.ptlogin2.qq.com
+  # nameserver:
+  #   - 114.114.114.114
+  #   - tls://dns.rubyfish.cn:853 # dns over tls
+  #   - https://1.1.1.1/dns-query # dns over https
+  # fallback: # concurrent request with nameserver, fallback used when GEOIP country isn't CN
+  #   - tcp://1.1.1.1
+  # fallback-filter:
+  #   geoip: true # default
+  #   ipcidr: # ips in these subnets will be considered polluted
+  #     - 240.0.0.0/4
+
+Proxy:
+  # 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
+
+  # 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
+
+  # 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
+
+  # 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
+
+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
+
+  # fallback select an available policy by priority. The availability is tested by accessing an URL, just like an auto url-test group.
+  - name: "fallback-auto"
+    type: fallback
+    proxies:
+      - ss1
+      - ss2
+      - vmess1
+    url: 'http://www.gstatic.com/generate_204'
+    interval: 300
+
+  # load-balance: The request of the same eTLD will be dial on the same proxy.
+  - name: "load-balance"
+    type: load-balance
+    proxies:
+      - ss1
+      - ss2
+      - vmess1
+    url: 'http://www.gstatic.com/generate_204'
+    interval: 300
+
+  # select is used for selecting proxy or proxy group
+  # you can use RESTful API to switch proxy, is recommended for use in GUI.
+  - name: Proxy
+    type: select
+    proxies:
+      - ss1
+      - ss2
+      - vmess1
+      - auto
+
+Rule:
+  - 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
 
 [riobard/go-shadowsocks2](https://github.com/riobard/go-shadowsocks2)
@@ -123,5 +316,6 @@ FINAL,,Proxy # note: there is two ","
 
 - [x] Complementing the necessary rule operators
 - [x] Redir proxy
-- [ ] UDP support
-- [ ] Connection manager
+- [x] UDP support
+- [x] Connection manager
+- [ ] Event API

adapters/inbound/http.go

@@ -1,4 +1,4 @@
-package adapters
+package inbound
 
 import (
 	"net"
@@ -10,32 +10,28 @@ import (
 
 // HTTPAdapter is a adapter for HTTP connection
 type HTTPAdapter struct {
-	addr *C.Addr
-	conn net.Conn
-	R    *http.Request
+	net.Conn
+	metadata *C.Metadata
+	R        *http.Request
 }
 
-// Close HTTP connection
-func (h *HTTPAdapter) Close() {
-	h.conn.Close()
-}
-
-// Addr return destination address
-func (h *HTTPAdapter) Addr() *C.Addr {
-	return h.addr
-}
-
-// Conn return raw net.Conn of HTTP
-func (h *HTTPAdapter) Conn() net.Conn {
-	return h.conn
+// Metadata return destination metadata
+func (h *HTTPAdapter) Metadata() *C.Metadata {
+	return h.metadata
 }
 
 // NewHTTP is HTTPAdapter generator
 func NewHTTP(request *http.Request, conn net.Conn) *HTTPAdapter {
+	metadata := parseHTTPAddr(request)
+	metadata.Type = C.HTTP
+	if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {
+		metadata.SrcIP = ip
+		metadata.SrcPort = port
+	}
 	return &HTTPAdapter{
-		addr: parseHTTPAddr(request),
-		R:    request,
-		conn: conn,
+		metadata: metadata,
+		R:        request,
+		Conn:     conn,
 	}
 }
 

adapters/inbound/https.go

@@ -0,0 +1,22 @@
+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
+	}
+	return &SocketAdapter{
+		metadata: metadata,
+		Conn:     conn,
+	}
+}

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, netType C.NetWork) *PacketAdapter {
+	metadata := parseSocksAddr(target)
+	metadata.NetWork = netType
+	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

@@ -0,0 +1,35 @@
+package inbound
+
+import (
+	"net"
+
+	"github.com/Dreamacro/clash/component/socks5"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+// SocketAdapter is a adapter for socks and redir connection
+type SocketAdapter struct {
+	net.Conn
+	metadata *C.Metadata
+}
+
+// Metadata return destination metadata
+func (s *SocketAdapter) Metadata() *C.Metadata {
+	return s.metadata
+}
+
+// NewSocket is SocketAdapter generator
+func NewSocket(target socks5.Addr, conn net.Conn, source C.Type, netType C.NetWork) *SocketAdapter {
+	metadata := parseSocksAddr(target)
+	metadata.NetWork = netType
+	metadata.Type = source
+	if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {
+		metadata.SrcIP = ip
+		metadata.SrcPort = port
+	}
+
+	return &SocketAdapter{
+		Conn:     conn,
+		metadata: metadata,
+	}
+}

adapters/inbound/util.go

@@ -0,0 +1,71 @@
+package inbound
+
+import (
+	"net"
+	"net/http"
+	"strconv"
+
+	"github.com/Dreamacro/clash/component/socks5"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+func parseSocksAddr(target socks5.Addr) *C.Metadata {
+	metadata := &C.Metadata{
+		AddrType: int(target[0]),
+	}
+
+	switch target[0] {
+	case socks5.AtypDomainName:
+		metadata.Host = string(target[2 : 2+target[1]])
+		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.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.DstPort = strconv.Itoa((int(target[1+net.IPv6len]) << 8) | int(target[1+net.IPv6len+1]))
+	}
+
+	return metadata
+}
+
+func parseHTTPAddr(request *http.Request) *C.Metadata {
+	host := request.URL.Hostname()
+	port := request.URL.Port()
+	if port == "" {
+		port = "80"
+	}
+
+	metadata := &C.Metadata{
+		NetWork:  C.TCP,
+		AddrType: C.AtypDomainName,
+		Host:     host,
+		DstIP:    nil,
+		DstPort:  port,
+	}
+
+	ip := net.ParseIP(host)
+	if ip != nil {
+		switch {
+		case ip.To4() == nil:
+			metadata.AddrType = C.AtypIPv6
+		default:
+			metadata.AddrType = C.AtypIPv4
+		}
+		metadata.DstIP = ip
+	}
+
+	return metadata
+}
+
+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
+}

adapters/local/https.go

@@ -1,14 +0,0 @@
-package adapters
-
-import (
-	"net"
-	"net/http"
-)
-
-// NewHTTPS is HTTPAdapter generator
-func NewHTTPS(request *http.Request, conn net.Conn) *SocketAdapter {
-	return &SocketAdapter{
-		addr: parseHTTPAddr(request),
-		conn: conn,
-	}
-}

adapters/local/socket.go

@@ -1,37 +0,0 @@
-package adapters
-
-import (
-	"net"
-
-	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/go-shadowsocks2/socks"
-)
-
-// SocketAdapter is a adapter for socks and redir connection
-type SocketAdapter struct {
-	conn net.Conn
-	addr *C.Addr
-}
-
-// Close socks and redir connection
-func (s *SocketAdapter) Close() {
-	s.conn.Close()
-}
-
-// Addr return destination address
-func (s *SocketAdapter) Addr() *C.Addr {
-	return s.addr
-}
-
-// Conn return raw net.Conn
-func (s *SocketAdapter) Conn() net.Conn {
-	return s.conn
-}
-
-// NewSocket is SocketAdapter generator
-func NewSocket(target socks.Addr, conn net.Conn) *SocketAdapter {
-	return &SocketAdapter{
-		conn: conn,
-		addr: parseSocksAddr(target),
-	}
-}

adapters/local/util.go

@@ -1,71 +0,0 @@
-package adapters
-
-import (
-	"net"
-	"net/http"
-	"strconv"
-
-	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/go-shadowsocks2/socks"
-)
-
-func parseSocksAddr(target socks.Addr) *C.Addr {
-	var host, port string
-	var ip net.IP
-
-	switch target[0] {
-	case socks.AtypDomainName:
-		host = string(target[2 : 2+target[1]])
-		port = strconv.Itoa((int(target[2+target[1]]) << 8) | int(target[2+target[1]+1]))
-		ipAddr, err := net.ResolveIPAddr("ip", host)
-		if err == nil {
-			ip = ipAddr.IP
-		}
-	case socks.AtypIPv4:
-		ip = net.IP(target[1 : 1+net.IPv4len])
-		port = strconv.Itoa((int(target[1+net.IPv4len]) << 8) | int(target[1+net.IPv4len+1]))
-	case socks.AtypIPv6:
-		ip = net.IP(target[1 : 1+net.IPv6len])
-		port = strconv.Itoa((int(target[1+net.IPv6len]) << 8) | int(target[1+net.IPv6len+1]))
-	}
-
-	return &C.Addr{
-		NetWork:  C.TCP,
-		AddrType: int(target[0]),
-		Host:     host,
-		IP:       &ip,
-		Port:     port,
-	}
-}
-
-func parseHTTPAddr(request *http.Request) *C.Addr {
-	host := request.URL.Hostname()
-	port := request.URL.Port()
-	if port == "" {
-		port = "80"
-	}
-	ipAddr, err := net.ResolveIPAddr("ip", host)
-	var resolveIP *net.IP
-	if err == nil {
-		resolveIP = &ipAddr.IP
-	}
-
-	var addType int
-	ip := net.ParseIP(host)
-	switch {
-	case ip == nil:
-		addType = socks.AtypDomainName
-	case ip.To4() == nil:
-		addType = socks.AtypIPv6
-	default:
-		addType = socks.AtypIPv4
-	}
-
-	return &C.Addr{
-		NetWork:  C.TCP,
-		AddrType: addType,
-		Host:     host,
-		IP:       resolveIP,
-		Port:     port,
-	}
-}

adapters/outbound/base.go

@@ -0,0 +1,204 @@
+package outbound
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net"
+	"net/http"
+	"time"
+
+	"github.com/Dreamacro/clash/common/queue"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+var (
+	defaultURLTestTimeout = time.Second * 5
+)
+
+type Base struct {
+	name string
+	tp   C.AdapterType
+	udp  bool
+}
+
+func (b *Base) Name() string {
+	return b.name
+}
+
+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) SupportUDP() bool {
+	return b.udp
+}
+
+func (b *Base) MarshalJSON() ([]byte, error) {
+	return json.Marshal(map[string]string{
+		"type": b.Type().String(),
+	})
+}
+
+func NewBase(name string, tp C.AdapterType, udp bool) *Base {
+	return &Base{name, tp, udp}
+}
+
+type conn struct {
+	net.Conn
+	chain C.Chain
+}
+
+func (c *conn) Chains() C.Chain {
+	return c.chain
+}
+
+func (c *conn) AppendToChains(a C.ProxyAdapter) {
+	c.chain = append(c.chain, a.Name())
+}
+
+func newConn(c net.Conn, a C.ProxyAdapter) C.Conn {
+	return &conn{c, []string{a.Name()}}
+}
+
+type packetConn struct {
+	net.PacketConn
+	chain C.Chain
+}
+
+func (c *packetConn) Chains() C.Chain {
+	return c.chain
+}
+
+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()}}
+}
+
+type Proxy struct {
+	C.ProxyAdapter
+	history *queue.Queue
+	alive   bool
+}
+
+func (p *Proxy) Alive() bool {
+	return p.alive
+}
+
+func (p *Proxy) Dial(metadata *C.Metadata) (C.Conn, error) {
+	ctx, cancel := context.WithTimeout(context.Background(), tcpTimeout)
+	defer cancel()
+	return p.DialContext(ctx, metadata)
+}
+
+func (p *Proxy) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	conn, err := p.ProxyAdapter.DialContext(ctx, metadata)
+	if err != nil {
+		p.alive = false
+	}
+	return conn, err
+}
+
+func (p *Proxy) DelayHistory() []C.DelayHistory {
+	queue := p.history.Copy()
+	histories := []C.DelayHistory{}
+	for _, item := range queue {
+		histories = append(histories, item.(C.DelayHistory))
+	}
+	return histories
+}
+
+// LastDelay return last history record. if proxy is not alive, return the max value of uint16.
+func (p *Proxy) LastDelay() (delay uint16) {
+	var max uint16 = 0xffff
+	if !p.alive {
+		return max
+	}
+
+	last := p.history.Last()
+	if last == nil {
+		return max
+	}
+	history := last.(C.DelayHistory)
+	if history.Delay == 0 {
+		return max
+	}
+	return history.Delay
+}
+
+func (p *Proxy) MarshalJSON() ([]byte, error) {
+	inner, err := p.ProxyAdapter.MarshalJSON()
+	if err != nil {
+		return inner, err
+	}
+
+	mapping := map[string]interface{}{}
+	json.Unmarshal(inner, &mapping)
+	mapping["history"] = p.DelayHistory()
+	mapping["name"] = p.Name()
+	return json.Marshal(mapping)
+}
+
+// URLTest get the delay for the specified URL
+func (p *Proxy) URLTest(ctx context.Context, url string) (t uint16, err error) {
+	defer func() {
+		p.alive = err == nil
+		record := C.DelayHistory{Time: time.Now()}
+		if err == nil {
+			record.Delay = t
+		}
+		p.history.Put(record)
+		if p.history.Len() > 10 {
+			p.history.Pop()
+		}
+	}()
+
+	addr, err := urlToMetadata(url)
+	if err != nil {
+		return
+	}
+
+	start := time.Now()
+	instance, err := p.DialContext(ctx, &addr)
+	if err != nil {
+		return
+	}
+	defer instance.Close()
+
+	req, err := http.NewRequest(http.MethodHead, url, nil)
+	if err != nil {
+		return
+	}
+	req = req.WithContext(ctx)
+
+	transport := &http.Transport{
+		Dial: func(string, string) (net.Conn, error) {
+			return instance, nil
+		},
+		// from http.DefaultTransport
+		MaxIdleConns:          100,
+		IdleConnTimeout:       90 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 1 * time.Second,
+	}
+
+	client := http.Client{Transport: transport}
+	resp, err := client.Do(req)
+	if err != nil {
+		return
+	}
+	resp.Body.Close()
+	t = uint16(time.Since(start) / time.Millisecond)
+	return
+}
+
+func NewProxy(adapter C.ProxyAdapter) *Proxy {
+	return &Proxy{adapter, queue.New(10), true}
+}

adapters/outbound/direct.go

@@ -0,0 +1,49 @@
+package outbound
+
+import (
+	"context"
+	"net"
+
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Direct struct {
+	*Base
+}
+
+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)
+	}
+
+	c, err := dialContext(ctx, "tcp", address)
+	if err != nil {
+		return nil, err
+	}
+	tcpKeepAlive(c)
+	return newConn(c, d), nil
+}
+
+func (d *Direct) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
+	pc, err := net.ListenPacket("udp", "")
+	if err != nil {
+		return nil, nil, err
+	}
+
+	addr, err := resolveUDPAddr("udp", metadata.RemoteAddress())
+	if err != nil {
+		return nil, nil, err
+	}
+	return newPacketConn(pc, d), addr, nil
+}
+
+func NewDirect() *Direct {
+	return &Direct{
+		Base: &Base{
+			name: "DIRECT",
+			tp:   C.Direct,
+			udp:  true,
+		},
+	}
+}

adapters/outbound/http.go

@@ -0,0 +1,122 @@
+package outbound
+
+import (
+	"bufio"
+	"context"
+	"crypto/tls"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"strconv"
+
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Http struct {
+	*Base
+	addr      string
+	user      string
+	pass      string
+	tlsConfig *tls.Config
+}
+
+type HttpOption struct {
+	Name           string `proxy:"name"`
+	Server         string `proxy:"server"`
+	Port           int    `proxy:"port"`
+	UserName       string `proxy:"username,omitempty"`
+	Password       string `proxy:"password,omitempty"`
+	TLS            bool   `proxy:"tls,omitempty"`
+	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.tlsConfig != nil {
+		cc := tls.Client(c, h.tlsConfig)
+		err = cc.Handshake()
+		c = cc
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", h.addr, err)
+	}
+	tcpKeepAlive(c)
+	if err := h.shakeHand(metadata, c); err != nil {
+		return nil, err
+	}
+
+	return newConn(c, h), nil
+}
+
+func (h *Http) shakeHand(metadata *C.Metadata, rw io.ReadWriter) error {
+	addr := metadata.RemoteAddress()
+	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
+		req.Header.Add("Proxy-Authorization", "Basic "+base64.StdEncoding.EncodeToString([]byte(auth)))
+	}
+
+	if err := req.Write(rw); err != nil {
+		return err
+	}
+
+	resp, err := http.ReadResponse(bufio.NewReader(rw), req)
+	if err != nil {
+		return err
+	}
+
+	if resp.StatusCode == http.StatusOK {
+		return nil
+	}
+
+	if resp.StatusCode == http.StatusProxyAuthRequired {
+		return errors.New("HTTP need auth")
+	}
+
+	if resp.StatusCode == http.StatusMethodNotAllowed {
+		return errors.New("CONNECT method not allowed by proxy")
+	}
+
+	if resp.StatusCode >= http.StatusInternalServerError {
+		return errors.New(resp.Status)
+	}
+
+	return fmt.Errorf("can not connect remote err code: %d", resp.StatusCode)
+}
+
+func NewHttp(option HttpOption) *Http {
+	var tlsConfig *tls.Config
+	if option.TLS {
+		tlsConfig = &tls.Config{
+			InsecureSkipVerify: option.SkipCertVerify,
+			ClientSessionCache: getClientSessionCache(),
+			ServerName:         option.Server,
+		}
+	}
+
+	return &Http{
+		Base: &Base{
+			name: option.Name,
+			tp:   C.Http,
+		},
+		addr:      net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
+		user:      option.UserName,
+		pass:      option.Password,
+		tlsConfig: tlsConfig,
+	}
+}

adapters/outbound/parser.go

@@ -0,0 +1,64 @@
+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{}
+		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)
+	default:
+		return nil, fmt.Errorf("Unsupport proxy type: %s", proxyType)
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	return NewProxy(proxy), nil
+}

adapters/outbound/reject.go

@@ -1,6 +1,7 @@
-package adapters
+package outbound
 
 import (
+	"context"
 	"io"
 	"net"
 	"time"
@@ -8,42 +9,27 @@ import (
 	C "github.com/Dreamacro/clash/constant"
 )
 
-// RejectAdapter is a reject connected adapter
-type RejectAdapter struct {
-	conn net.Conn
-}
-
-// Close is used to close connection
-func (r *RejectAdapter) Close() {}
-
-// Conn is used to http request
-func (r *RejectAdapter) Conn() net.Conn {
-	return r.conn
-}
-
 type Reject struct {
+	*Base
 }
 
-func (r *Reject) Name() string {
-	return "Reject"
-}
-
-func (r *Reject) Type() C.AdapterType {
-	return C.Reject
-}
-
-func (r *Reject) Generator(addr *C.Addr) (adapter C.ProxyAdapter, err error) {
-	return &RejectAdapter{conn: &NopConn{}}, nil
+func (r *Reject) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	return newConn(&NopConn{}, r), nil
 }
 
 func NewReject() *Reject {
-	return &Reject{}
+	return &Reject{
+		Base: &Base{
+			name: "REJECT",
+			tp:   C.Reject,
+		},
+	}
 }
 
 type NopConn struct{}
 
 func (rw *NopConn) Read(b []byte) (int, error) {
-	return len(b), nil
+	return 0, io.EOF
 }
 
 func (rw *NopConn) Write(b []byte) (int, error) {

adapters/outbound/shadowsocks.go

@@ -0,0 +1,213 @@
+package outbound
+
+import (
+	"context"
+	"crypto/tls"
+	"encoding/json"
+	"fmt"
+	"net"
+	"strconv"
+
+	"github.com/Dreamacro/clash/common/structure"
+	obfs "github.com/Dreamacro/clash/component/simple-obfs"
+	"github.com/Dreamacro/clash/component/socks5"
+	v2rayObfs "github.com/Dreamacro/clash/component/v2ray-plugin"
+	C "github.com/Dreamacro/clash/constant"
+
+	"github.com/Dreamacro/go-shadowsocks2/core"
+)
+
+type ShadowSocks struct {
+	*Base
+	server string
+	cipher core.Cipher
+
+	// obfs
+	obfsMode    string
+	obfsOption  *simpleObfsOption
+	v2rayOption *v2rayObfs.Option
+}
+
+type ShadowSocksOption struct {
+	Name       string                 `proxy:"name"`
+	Server     string                 `proxy:"server"`
+	Port       int                    `proxy:"port"`
+	Password   string                 `proxy:"password"`
+	Cipher     string                 `proxy:"cipher"`
+	UDP        bool                   `proxy:"udp,omitempty"`
+	Plugin     string                 `proxy:"plugin,omitempty"`
+	PluginOpts map[string]interface{} `proxy:"plugin-opts,omitempty"`
+
+	// deprecated when bump to 1.0
+	Obfs     string `proxy:"obfs,omitempty"`
+	ObfsHost string `proxy:"obfs-host,omitempty"`
+}
+
+type simpleObfsOption struct {
+	Mode string `obfs:"mode"`
+	Host string `obfs:"host,omitempty"`
+}
+
+type v2rayObfsOption struct {
+	Mode           string            `obfs:"mode"`
+	Host           string            `obfs:"host,omitempty"`
+	Path           string            `obfs:"path,omitempty"`
+	TLS            bool              `obfs:"tls,omitempty"`
+	Headers        map[string]string `obfs:"headers,omitempty"`
+	SkipCertVerify bool              `obfs:"skip-cert-verify,omitempty"`
+	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: %w", ss.server, err)
+	}
+	tcpKeepAlive(c)
+	switch ss.obfsMode {
+	case "tls":
+		c = obfs.NewTLSObfs(c, ss.obfsOption.Host)
+	case "http":
+		_, port, _ := net.SplitHostPort(ss.server)
+		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: %w", ss.server, err)
+		}
+	}
+	c = ss.cipher.StreamConn(c)
+	_, err = c.Write(serializesSocksAddr(metadata))
+	return newConn(c, ss), err
+}
+
+func (ss *ShadowSocks) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
+	pc, err := net.ListenPacket("udp", "")
+	if err != nil {
+		return nil, nil, err
+	}
+
+	addr, err := resolveUDPAddr("udp", ss.server)
+	if err != nil {
+		return nil, nil, err
+	}
+
+	targetAddr := socks5.ParseAddr(metadata.RemoteAddress())
+	if targetAddr == nil {
+		return nil, nil, fmt.Errorf("parse address %s error: %s", metadata.String(), metadata.DstPort)
+	}
+
+	pc = ss.cipher.PacketConn(pc)
+	return newPacketConn(&ssUDPConn{PacketConn: pc, rAddr: targetAddr}, ss), addr, nil
+}
+
+func (ss *ShadowSocks) MarshalJSON() ([]byte, error) {
+	return json.Marshal(map[string]string{
+		"type": ss.Type().String(),
+	})
+}
+
+func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
+	server := 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: %w", server, err)
+	}
+
+	var v2rayOption *v2rayObfs.Option
+	var obfsOption *simpleObfsOption
+	obfsMode := ""
+
+	// forward compatibility before 1.0
+	if option.Obfs != "" {
+		obfsMode = option.Obfs
+		obfsOption = &simpleObfsOption{
+			Host: "bing.com",
+		}
+		if option.ObfsHost != "" {
+			obfsOption.Host = option.ObfsHost
+		}
+	}
+
+	decoder := structure.NewDecoder(structure.Option{TagName: "obfs", WeaklyTypedInput: true})
+	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: %w", server, err)
+		}
+
+		if opts.Mode != "tls" && opts.Mode != "http" {
+			return nil, fmt.Errorf("ss %s obfs mode error: %s", server, 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: %w", server, err)
+		}
+
+		if opts.Mode != "websocket" {
+			return nil, fmt.Errorf("ss %s obfs mode error: %s", server, 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,
+		}
+	}
+
+	return &ShadowSocks{
+		Base: &Base{
+			name: option.Name,
+			tp:   C.Shadowsocks,
+			udp:  option.UDP,
+		},
+		server: server,
+		cipher: ciph,
+
+		obfsMode:    obfsMode,
+		v2rayOption: v2rayOption,
+		obfsOption:  obfsOption,
+	}, nil
+}
+
+type ssUDPConn struct {
+	net.PacketConn
+	rAddr socks5.Addr
+}
+
+func (uc *ssUDPConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(uc.rAddr, b)
+	if err != nil {
+		return
+	}
+	return uc.PacketConn.WriteTo(packet[3:], addr)
+}
+
+func (uc *ssUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, _, e := uc.PacketConn.ReadFrom(b)
+	addr := socks5.SplitAddr(b[:n])
+	var from net.Addr
+	if e == nil {
+		// Get the source IP/Port of packet.
+		from = addr.UDPAddr()
+	}
+	copy(b, b[len(addr):])
+	return n - len(addr), from, e
+}

adapters/outbound/snell.go

@@ -0,0 +1,72 @@
+package outbound
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"strconv"
+
+	"github.com/Dreamacro/clash/common/structure"
+	obfs "github.com/Dreamacro/clash/component/simple-obfs"
+	"github.com/Dreamacro/clash/component/snell"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Snell struct {
+	*Base
+	server     string
+	psk        []byte
+	obfsOption *simpleObfsOption
+}
+
+type SnellOption struct {
+	Name     string                 `proxy:"name"`
+	Server   string                 `proxy:"server"`
+	Port     int                    `proxy:"port"`
+	Psk      string                 `proxy:"psk"`
+	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: %w", s.server, err)
+	}
+	tcpKeepAlive(c)
+	switch s.obfsOption.Mode {
+	case "tls":
+		c = obfs.NewTLSObfs(c, s.obfsOption.Host)
+	case "http":
+		_, port, _ := net.SplitHostPort(s.server)
+		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
+}
+
+func NewSnell(option SnellOption) (*Snell, error) {
+	server := 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: %w", server, err)
+	}
+
+	if obfsOption.Mode != "tls" && obfsOption.Mode != "http" {
+		return nil, fmt.Errorf("snell %s obfs mode error: %s", server, obfsOption.Mode)
+	}
+
+	return &Snell{
+		Base: &Base{
+			name: option.Name,
+			tp:   C.Snell,
+		},
+		server:     server,
+		psk:        psk,
+		obfsOption: obfsOption,
+	}, nil
+}

adapters/outbound/socks5.go

@@ -0,0 +1,182 @@
+package outbound
+
+import (
+	"context"
+	"crypto/tls"
+	"fmt"
+	"io"
+	"io/ioutil"
+	"net"
+	"strconv"
+
+	"github.com/Dreamacro/clash/component/socks5"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Socks5 struct {
+	*Base
+	addr           string
+	user           string
+	pass           string
+	tls            bool
+	skipCertVerify bool
+	tlsConfig      *tls.Config
+}
+
+type Socks5Option struct {
+	Name           string `proxy:"name"`
+	Server         string `proxy:"server"`
+	Port           int    `proxy:"port"`
+	UserName       string `proxy:"username,omitempty"`
+	Password       string `proxy:"password,omitempty"`
+	TLS            bool   `proxy:"tls,omitempty"`
+	UDP            bool   `proxy:"udp,omitempty"`
+	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 {
+		cc := tls.Client(c, ss.tlsConfig)
+		err = cc.Handshake()
+		c = cc
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
+	}
+	tcpKeepAlive(c)
+	var user *socks5.User
+	if ss.user != "" {
+		user = &socks5.User{
+			Username: ss.user,
+			Password: ss.pass,
+		}
+	}
+	if _, err := socks5.ClientHandshake(c, serializesSocksAddr(metadata), socks5.CmdConnect, user); err != nil {
+		return nil, err
+	}
+	return newConn(c, ss), nil
+}
+
+func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, _ net.Addr, err error) {
+	ctx, cancel := context.WithTimeout(context.Background(), tcpTimeout)
+	defer cancel()
+	c, err := dialContext(ctx, "tcp", ss.addr)
+	if err != nil {
+		err = fmt.Errorf("%s connect error: %w", ss.addr, err)
+		return
+	}
+
+	if ss.tls {
+		cc := tls.Client(c, ss.tlsConfig)
+		err = cc.Handshake()
+		c = cc
+	}
+
+	defer func() {
+		if err != nil {
+			c.Close()
+		}
+	}()
+
+	tcpKeepAlive(c)
+	var user *socks5.User
+	if ss.user != "" {
+		user = &socks5.User{
+			Username: ss.user,
+			Password: ss.pass,
+		}
+	}
+
+	bindAddr, err := socks5.ClientHandshake(c, serializesSocksAddr(metadata), socks5.CmdUDPAssociate, user)
+	if err != nil {
+		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 %s error: %s", metadata.String(), metadata.DstPort)
+	}
+
+	pc, err := net.ListenPacket("udp", "")
+	if err != nil {
+		return
+	}
+
+	go func() {
+		io.Copy(ioutil.Discard, c)
+		c.Close()
+		// A UDP association terminates when the TCP connection that the UDP
+		// ASSOCIATE request arrived on terminates. RFC1928
+		pc.Close()
+	}()
+
+	return newPacketConn(&socksUDPConn{PacketConn: pc, rAddr: targetAddr, tcpConn: c}, ss), addr, nil
+}
+
+func NewSocks5(option Socks5Option) *Socks5 {
+	var tlsConfig *tls.Config
+	if option.TLS {
+		tlsConfig = &tls.Config{
+			InsecureSkipVerify: option.SkipCertVerify,
+			ClientSessionCache: getClientSessionCache(),
+			ServerName:         option.Server,
+		}
+	}
+
+	return &Socks5{
+		Base: &Base{
+			name: option.Name,
+			tp:   C.Socks5,
+			udp:  option.UDP,
+		},
+		addr:           net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
+		user:           option.UserName,
+		pass:           option.Password,
+		tls:            option.TLS,
+		skipCertVerify: option.SkipCertVerify,
+		tlsConfig:      tlsConfig,
+	}
+}
+
+type socksUDPConn struct {
+	net.PacketConn
+	rAddr   socks5.Addr
+	tcpConn net.Conn
+}
+
+func (uc *socksUDPConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(uc.rAddr, b)
+	if err != nil {
+		return
+	}
+	return uc.PacketConn.WriteTo(packet, addr)
+}
+
+func (uc *socksUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, a, e := uc.PacketConn.ReadFrom(b)
+	if e != nil {
+		return 0, nil, e
+	}
+	addr, payload, err := socks5.DecodeUDPPacket(b)
+	if err != nil {
+		return 0, nil, err
+	}
+	// due to DecodeUDPPacket is mutable, record addr length
+	addrLength := len(addr)
+	copy(b, payload)
+	return n - addrLength - 3, a, nil
+}
+
+func (uc *socksUDPConn) Close() error {
+	uc.tcpConn.Close()
+	return uc.PacketConn.Close()
+}

adapters/outbound/util.go

@@ -0,0 +1,180 @@
+package outbound
+
+import (
+	"bytes"
+	"context"
+	"crypto/tls"
+	"fmt"
+	"net"
+	"net/url"
+	"strconv"
+	"sync"
+	"time"
+
+	"github.com/Dreamacro/clash/component/socks5"
+	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/dns"
+)
+
+const (
+	tcpTimeout = 5 * time.Second
+)
+
+var (
+	globalClientSessionCache tls.ClientSessionCache
+	once                     sync.Once
+)
+
+func urlToMetadata(rawURL string) (addr C.Metadata, err error) {
+	u, err := url.Parse(rawURL)
+	if err != nil {
+		return
+	}
+
+	port := u.Port()
+	if port == "" {
+		switch u.Scheme {
+		case "https":
+			port = "443"
+		case "http":
+			port = "80"
+		default:
+			err = fmt.Errorf("%s scheme not Support", rawURL)
+			return
+		}
+	}
+
+	addr = C.Metadata{
+		AddrType: C.AtypDomainName,
+		Host:     u.Hostname(),
+		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)
+	}
+}
+
+func getClientSessionCache() tls.ClientSessionCache {
+	once.Do(func() {
+		globalClientSessionCache = tls.NewLRUClientSessionCache(128)
+	})
+	return globalClientSessionCache
+}
+
+func serializesSocksAddr(metadata *C.Metadata) []byte {
+	var buf [][]byte
+	aType := uint8(metadata.AddrType)
+	p, _ := strconv.Atoi(metadata.DstPort)
+	port := []byte{uint8(p >> 8), uint8(p & 0xff)}
+	switch metadata.AddrType {
+	case socks5.AtypDomainName:
+		len := uint8(len(metadata.Host))
+		host := []byte(metadata.Host)
+		buf = [][]byte{{aType, len}, host, port}
+	case socks5.AtypIPv4:
+		host := metadata.DstIP.To4()
+		buf = [][]byte{{aType}, host, port}
+	case socks5.AtypIPv6:
+		host := metadata.DstIP.To16()
+		buf = [][]byte{{aType}, host, port}
+	}
+	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
+	}
+
+	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) {
+		dialer := net.Dialer{}
+		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)
+	if err != nil {
+		return nil, err
+	}
+	return net.ResolveUDPAddr(network, net.JoinHostPort(ip.String(), port))
+}

adapters/outbound/vmess.go

@@ -0,0 +1,129 @@
+package outbound
+
+import (
+	"context"
+	"fmt"
+	"net"
+	"strconv"
+	"strings"
+
+	"github.com/Dreamacro/clash/component/vmess"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Vmess struct {
+	*Base
+	server string
+	client *vmess.Client
+}
+
+type VmessOption struct {
+	Name           string            `proxy:"name"`
+	Server         string            `proxy:"server"`
+	Port           int               `proxy:"port"`
+	UUID           string            `proxy:"uuid"`
+	AlterID        int               `proxy:"alterId"`
+	Cipher         string            `proxy:"cipher"`
+	TLS            bool              `proxy:"tls,omitempty"`
+	UDP            bool              `proxy:"udp,omitempty"`
+	Network        string            `proxy:"network,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
+}
+
+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)
+	if err != nil {
+		return nil, nil, fmt.Errorf("%s connect error", v.server)
+	}
+	tcpKeepAlive(c)
+	c, err = v.client.New(c, parseVmessAddr(metadata))
+	if err != nil {
+		return nil, nil, fmt.Errorf("new vmess client error: %v", err)
+	}
+	return newPacketConn(&vmessUDPConn{Conn: c}, v), c.RemoteAddr(), 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(),
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	return &Vmess{
+		Base: &Base{
+			name: option.Name,
+			tp:   C.Vmess,
+			udp:  true,
+		},
+		server: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
+		client: client,
+	}, nil
+}
+
+func parseVmessAddr(metadata *C.Metadata) *vmess.DstAddr {
+	var addrType byte
+	var addr []byte
+	switch metadata.AddrType {
+	case C.AtypIPv4:
+		addrType = byte(vmess.AtypIPv4)
+		addr = make([]byte, net.IPv4len)
+		copy(addr[:], metadata.DstIP.To4())
+	case C.AtypIPv6:
+		addrType = byte(vmess.AtypIPv6)
+		addr = make([]byte, net.IPv6len)
+		copy(addr[:], metadata.DstIP.To16())
+	case C.AtypDomainName:
+		addrType = byte(vmess.AtypDomainName)
+		addr = make([]byte, len(metadata.Host)+1)
+		addr[0] = byte(len(metadata.Host))
+		copy(addr[1:], []byte(metadata.Host))
+	}
+
+	port, _ := strconv.Atoi(metadata.DstPort)
+	return &vmess.DstAddr{
+		UDP:      metadata.NetWork == C.UDP,
+		AddrType: addrType,
+		Addr:     addr,
+		Port:     uint(port),
+	}
+}
+
+type vmessUDPConn struct {
+	net.Conn
+}
+
+func (uc *vmessUDPConn) 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
+}

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 +1,85 @@
+package outboundgroup
+
+import (
+	"context"
+	"encoding/json"
+	"net"
+
+	"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, 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) 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 +1,128 @@
+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)
+		}
+	}()
+
+	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() {
+			c, err = proxy.DialContext(ctx, metadata)
+			return
+		}
+	}
+	c, err = 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))))
+	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.DialUDP(metadata)
+		}
+	}
+
+	return proxies[0].DialUDP(metadata)
+}
+
+func (lb *LoadBalance) SupportUDP() bool {
+	return true
+}
+
+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 +1,144 @@
+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.NewCompatibleProvier(groupName, ps, hc)
+			if err != nil {
+				return nil, err
+			}
+
+			providers = append(providers, pd)
+		} else {
+			// select don't need health check
+			if groupOption.Type == "select" {
+				hc := provider.NewHealthCheck(ps, "", 0)
+				pd, err := provider.NewCompatibleProvier(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.NewCompatibleProvier(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)
+	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/selector.go

@@ -0,0 +1,86 @@
+package outboundgroup
+
+import (
+	"context"
+	"encoding/json"
+	"errors"
+	"net"
+
+	"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  C.Proxy
+	providers []provider.ProxyProvider
+}
+
+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) {
+	var all []string
+	for _, proxy := range s.proxies() {
+		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.selected.Name()
+}
+
+func (s *Selector) Set(name string) error {
+	for _, proxy := range s.proxies() {
+		if proxy.Name() == name {
+			s.selected = proxy
+			return nil
+		}
+	}
+
+	return errors.New("Proxy does not exist")
+}
+
+func (s *Selector) proxies() []C.Proxy {
+	elm, _, _ := s.single.Do(func() (interface{}, error) {
+		return getProvidersProxies(s.providers), nil
+	})
+
+	return elm.([]C.Proxy)
+}
+
+func NewSelector(name string, providers []provider.ProxyProvider) *Selector {
+	selected := providers[0].Proxies()[0]
+	return &Selector{
+		Base:      outbound.NewBase(name, C.Selector, false),
+		single:    singledo.NewSingle(defaultGetProxiesDuration),
+		providers: providers,
+		selected:  selected,
+	}
+}

adapters/outboundgroup/urltest.go

@@ -0,0 +1,95 @@
+package outboundgroup
+
+import (
+	"context"
+	"encoding/json"
+	"net"
+	"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, net.Addr, error) {
+	pc, addr, err := u.fast().DialUDP(metadata)
+	if err == nil {
+		pc.AppendToChains(u)
+	}
+	return pc, addr, err
+}
+
+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/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.Reslove(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 +1,318 @@
+package provider
+
+import (
+	"bytes"
+	"crypto/md5"
+	"encoding/json"
+	"errors"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"time"
+
+	"github.com/Dreamacro/clash/adapters/outbound"
+	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/log"
+
+	"gopkg.in/yaml.v2"
+)
+
+const (
+	ReservedName = "default"
+
+	fileMode = 0666
+)
+
+// 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
+	Reload() error
+	Destroy() error
+}
+
+// ProxyProvider interface
+type ProxyProvider interface {
+	Provider
+	Proxies() []C.Proxy
+	HealthCheck()
+	Update() error
+}
+
+type ProxySchema struct {
+	Proxies []map[string]interface{} `yaml:"proxies"`
+}
+
+type ProxySetProvider struct {
+	name        string
+	vehicle     Vehicle
+	hash        [16]byte
+	proxies     []C.Proxy
+	healthCheck *HealthCheck
+	ticker      *time.Ticker
+	updatedAt   *time.Time
+}
+
+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) Reload() error {
+	return nil
+}
+
+func (pp *ProxySetProvider) HealthCheck() {
+	pp.healthCheck.check()
+}
+
+func (pp *ProxySetProvider) Update() error {
+	return pp.pull()
+}
+
+func (pp *ProxySetProvider) Destroy() error {
+	pp.healthCheck.close()
+
+	if pp.ticker != nil {
+		pp.ticker.Stop()
+	}
+
+	return nil
+}
+
+func (pp *ProxySetProvider) Initial() error {
+	var buf []byte
+	var err error
+	if stat, err := os.Stat(pp.vehicle.Path()); err == nil {
+		buf, err = ioutil.ReadFile(pp.vehicle.Path())
+		modTime := stat.ModTime()
+		pp.updatedAt = &modTime
+	} else {
+		buf, err = pp.vehicle.Read()
+	}
+
+	if err != nil {
+		return err
+	}
+
+	proxies, err := pp.parse(buf)
+	if err != nil {
+		return err
+	}
+
+	if err := ioutil.WriteFile(pp.vehicle.Path(), buf, fileMode); err != nil {
+		return err
+	}
+
+	pp.hash = md5.Sum(buf)
+	pp.setProxies(proxies)
+
+	// pull proxies automatically
+	if pp.ticker != nil {
+		go pp.pullLoop()
+	}
+
+	return nil
+}
+
+func (pp *ProxySetProvider) VehicleType() VehicleType {
+	return pp.vehicle.Type()
+}
+
+func (pp *ProxySetProvider) Type() ProviderType {
+	return Proxy
+}
+
+func (pp *ProxySetProvider) Proxies() []C.Proxy {
+	return pp.proxies
+}
+
+func (pp *ProxySetProvider) pullLoop() {
+	for range pp.ticker.C {
+		if err := pp.pull(); err != nil {
+			log.Warnln("[Provider] %s pull error: %s", pp.Name(), err.Error())
+		}
+	}
+}
+
+func (pp *ProxySetProvider) pull() error {
+	buf, err := pp.vehicle.Read()
+	if err != nil {
+		return err
+	}
+
+	now := time.Now()
+	hash := md5.Sum(buf)
+	if bytes.Equal(pp.hash[:], hash[:]) {
+		log.Debugln("[Provider] %s's proxies doesn't change", pp.Name())
+		pp.updatedAt = &now
+		return nil
+	}
+
+	proxies, err := pp.parse(buf)
+	if err != nil {
+		return err
+	}
+	log.Infoln("[Provider] %s's proxies update", pp.Name())
+
+	if err := ioutil.WriteFile(pp.vehicle.Path(), buf, fileMode); err != nil {
+		return err
+	}
+
+	pp.updatedAt = &now
+	pp.hash = hash
+	pp.setProxies(proxies)
+
+	return nil
+}
+
+func (pp *ProxySetProvider) parse(buf []byte) ([]C.Proxy, 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 NewProxySetProvider(name string, interval time.Duration, vehicle Vehicle, hc *HealthCheck) *ProxySetProvider {
+	var ticker *time.Ticker
+	if interval != 0 {
+		ticker = time.NewTicker(interval)
+	}
+
+	if hc.auto() {
+		go hc.process()
+	}
+
+	return &ProxySetProvider{
+		name:        name,
+		vehicle:     vehicle,
+		proxies:     []C.Proxy{},
+		healthCheck: hc,
+		ticker:      ticker,
+	}
+}
+
+type CompatibleProvier struct {
+	name        string
+	healthCheck *HealthCheck
+	proxies     []C.Proxy
+}
+
+func (cp *CompatibleProvier) 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 *CompatibleProvier) Name() string {
+	return cp.name
+}
+
+func (cp *CompatibleProvier) Reload() error {
+	return nil
+}
+
+func (cp *CompatibleProvier) Destroy() error {
+	cp.healthCheck.close()
+	return nil
+}
+
+func (cp *CompatibleProvier) HealthCheck() {
+	cp.healthCheck.check()
+}
+
+func (cp *CompatibleProvier) Update() error {
+	return nil
+}
+
+func (cp *CompatibleProvier) Initial() error {
+	return nil
+}
+
+func (cp *CompatibleProvier) VehicleType() VehicleType {
+	return Compatible
+}
+
+func (cp *CompatibleProvier) Type() ProviderType {
+	return Proxy
+}
+
+func (cp *CompatibleProvier) Proxies() []C.Proxy {
+	return cp.proxies
+}
+
+func NewCompatibleProvier(name string, proxies []C.Proxy, hc *HealthCheck) (*CompatibleProvier, error) {
+	if len(proxies) == 0 {
+		return nil, errors.New("Provider need one proxy at least")
+	}
+
+	if hc.auto() {
+		go hc.process()
+	}
+
+	return &CompatibleProvier{
+		name:        name,
+		proxies:     proxies,
+		healthCheck: hc,
+	}, nil
+}

adapters/provider/vehicle.go

@@ -0,0 +1,109 @@
+package provider
+
+import (
+	"context"
+	"io/ioutil"
+	"net/http"
+	"time"
+)
+
+// 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()
+
+	req, err := http.NewRequest(http.MethodGet, h.url, nil)
+	if err != nil {
+		return nil, err
+	}
+	req = req.WithContext(ctx)
+
+	transport := &http.Transport{
+		// from http.DefaultTransport
+		MaxIdleConns:          100,
+		IdleConnTimeout:       90 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 1 * time.Second,
+	}
+
+	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
+	}
+
+	if err := ioutil.WriteFile(h.path, buf, fileMode); err != nil {
+		return nil, err
+	}
+
+	return buf, nil
+}
+
+func NewHTTPVehicle(url string, path string) *HTTPVehicle {
+	return &HTTPVehicle{url, path}
+}

adapters/remote/direct.go

@@ -1,45 +0,0 @@
-package adapters
-
-import (
-	"net"
-
-	C "github.com/Dreamacro/clash/constant"
-)
-
-// DirectAdapter is a directly connected adapter
-type DirectAdapter struct {
-	conn net.Conn
-}
-
-// Close is used to close connection
-func (d *DirectAdapter) Close() {
-	d.conn.Close()
-}
-
-// Conn is used to http request
-func (d *DirectAdapter) Conn() net.Conn {
-	return d.conn
-}
-
-type Direct struct{}
-
-func (d *Direct) Name() string {
-	return "Direct"
-}
-
-func (d *Direct) Type() C.AdapterType {
-	return C.Direct
-}
-
-func (d *Direct) Generator(addr *C.Addr) (adapter C.ProxyAdapter, err error) {
-	c, err := net.Dial("tcp", net.JoinHostPort(addr.String(), addr.Port))
-	if err != nil {
-		return
-	}
-	tcpKeepAlive(c)
-	return &DirectAdapter{conn: c}, nil
-}
-
-func NewDirect() *Direct {
-	return &Direct{}
-}

adapters/remote/selector.go

@@ -1,67 +0,0 @@
-package adapters
-
-import (
-	"errors"
-	"sort"
-
-	C "github.com/Dreamacro/clash/constant"
-)
-
-type Selector struct {
-	name     string
-	selected C.Proxy
-	proxies  map[string]C.Proxy
-}
-
-func (s *Selector) Name() string {
-	return s.name
-}
-
-func (s *Selector) Type() C.AdapterType {
-	return C.Selector
-}
-
-func (s *Selector) Generator(addr *C.Addr) (adapter C.ProxyAdapter, err error) {
-	return s.selected.Generator(addr)
-}
-
-func (s *Selector) Now() string {
-	return s.selected.Name()
-}
-
-func (s *Selector) All() []string {
-	var all []string
-	for k := range s.proxies {
-		all = append(all, k)
-	}
-	sort.Strings(all)
-	return all
-}
-
-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 map[string]C.Proxy) (*Selector, error) {
-	if len(proxies) == 0 {
-		return nil, errors.New("Provide at least one proxy")
-	}
-
-	mapping := make(map[string]C.Proxy)
-	var init string
-	for k, v := range proxies {
-		mapping[k] = v
-		init = k
-	}
-	s := &Selector{
-		name:     name,
-		proxies:  mapping,
-		selected: proxies[init],
-	}
-	return s, nil
-}

adapters/remote/shadowsocks.go

@@ -1,123 +0,0 @@
-package adapters
-
-import (
-	"bytes"
-	"fmt"
-	"net"
-	"net/url"
-	"strconv"
-
-	"github.com/Dreamacro/clash/common/simple-obfs"
-	C "github.com/Dreamacro/clash/constant"
-
-	"github.com/Dreamacro/go-shadowsocks2/core"
-	"github.com/Dreamacro/go-shadowsocks2/socks"
-)
-
-// ShadowsocksAdapter is a shadowsocks adapter
-type ShadowsocksAdapter struct {
-	conn net.Conn
-}
-
-// Close is used to close connection
-func (ss *ShadowsocksAdapter) Close() {
-	ss.conn.Close()
-}
-
-func (ss *ShadowsocksAdapter) Conn() net.Conn {
-	return ss.conn
-}
-
-type ShadowSocks struct {
-	server   string
-	name     string
-	obfs     string
-	obfsHost string
-	cipher   core.Cipher
-}
-
-func (ss *ShadowSocks) Name() string {
-	return ss.name
-}
-
-func (ss *ShadowSocks) Type() C.AdapterType {
-	return C.Shadowsocks
-}
-
-func (ss *ShadowSocks) Generator(addr *C.Addr) (adapter C.ProxyAdapter, err error) {
-	c, err := net.Dial("tcp", ss.server)
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error", ss.server)
-	}
-	tcpKeepAlive(c)
-	switch ss.obfs {
-	case "tls":
-		c = obfs.NewTLSObfs(c, ss.obfsHost)
-	case "http":
-		_, port, _ := net.SplitHostPort(ss.server)
-		c = obfs.NewHTTPObfs(c, ss.obfsHost, port)
-	}
-	c = ss.cipher.StreamConn(c)
-	_, err = c.Write(serializesSocksAddr(addr))
-	return &ShadowsocksAdapter{conn: c}, err
-}
-
-func NewShadowSocks(name string, ssURL string, option map[string]string) (*ShadowSocks, error) {
-	server, cipher, password, _ := parseURL(ssURL)
-	ciph, err := core.PickCipher(cipher, nil, password)
-	if err != nil {
-		return nil, fmt.Errorf("ss %s initialize error: %s", server, err.Error())
-	}
-
-	obfs := ""
-	obfsHost := "bing.com"
-	if value, ok := option["obfs"]; ok {
-		obfs = value
-	}
-
-	if value, ok := option["obfs-host"]; ok {
-		obfsHost = value
-	}
-
-	return &ShadowSocks{
-		server:   server,
-		name:     name,
-		cipher:   ciph,
-		obfs:     obfs,
-		obfsHost: obfsHost,
-	}, nil
-}
-
-func parseURL(s string) (addr, cipher, password string, err error) {
-	u, err := url.Parse(s)
-	if err != nil {
-		return
-	}
-
-	addr = u.Host
-	if u.User != nil {
-		cipher = u.User.Username()
-		password, _ = u.User.Password()
-	}
-	return
-}
-
-func serializesSocksAddr(addr *C.Addr) []byte {
-	var buf [][]byte
-	aType := uint8(addr.AddrType)
-	p, _ := strconv.Atoi(addr.Port)
-	port := []byte{uint8(p >> 8), uint8(p & 0xff)}
-	switch addr.AddrType {
-	case socks.AtypDomainName:
-		len := uint8(len(addr.Host))
-		host := []byte(addr.Host)
-		buf = [][]byte{{aType, len}, host, port}
-	case socks.AtypIPv4:
-		host := addr.IP.To4()
-		buf = [][]byte{{aType}, host, port}
-	case socks.AtypIPv6:
-		host := addr.IP.To16()
-		buf = [][]byte{{aType}, host, port}
-	}
-	return bytes.Join(buf, nil)
-}

adapters/remote/socks5.go

@@ -1,90 +0,0 @@
-package adapters
-
-import (
-	"bytes"
-	"errors"
-	"fmt"
-	"io"
-	"net"
-
-	C "github.com/Dreamacro/clash/constant"
-
-	"github.com/Dreamacro/go-shadowsocks2/socks"
-)
-
-// Socks5Adapter is a shadowsocks adapter
-type Socks5Adapter struct {
-	conn net.Conn
-}
-
-// Close is used to close connection
-func (ss *Socks5Adapter) Close() {
-	ss.conn.Close()
-}
-
-func (ss *Socks5Adapter) Conn() net.Conn {
-	return ss.conn
-}
-
-type Socks5 struct {
-	addr string
-	name string
-}
-
-func (ss *Socks5) Name() string {
-	return ss.name
-}
-
-func (ss *Socks5) Type() C.AdapterType {
-	return C.Socks5
-}
-
-func (ss *Socks5) Generator(addr *C.Addr) (adapter C.ProxyAdapter, err error) {
-	c, err := net.Dial("tcp", ss.addr)
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error", ss.addr)
-	}
-	tcpKeepAlive(c)
-	if err := ss.shakeHand(addr, c); err != nil {
-		return nil, err
-	}
-	return &Socks5Adapter{conn: c}, nil
-}
-
-func (ss *Socks5) shakeHand(addr *C.Addr, rw io.ReadWriter) error {
-	buf := make([]byte, socks.MaxAddrLen)
-
-	// VER, CMD, RSV
-	_, err := rw.Write([]byte{5, 1, 0})
-	if err != nil {
-		return err
-	}
-
-	if _, err := io.ReadFull(rw, buf[:2]); err != nil {
-		return err
-	}
-
-	if buf[0] != 5 {
-		return errors.New("SOCKS version error")
-	} else if buf[1] != 0 {
-		return errors.New("SOCKS need auth")
-	}
-
-	// VER, CMD, RSV, ADDR
-	if _, err := rw.Write(bytes.Join([][]byte{{5, 1, 0}, serializesSocksAddr(addr)}, []byte(""))); err != nil {
-		return err
-	}
-
-	if _, err := io.ReadFull(rw, buf[:10]); err != nil {
-		return err
-	}
-
-	return nil
-}
-
-func NewSocks5(name, addr string) *Socks5 {
-	return &Socks5{
-		addr: addr,
-		name: name,
-	}
-}

adapters/remote/urltest.go

@@ -1,102 +0,0 @@
-package adapters
-
-import (
-	"sync"
-	"time"
-
-	C "github.com/Dreamacro/clash/constant"
-)
-
-type URLTest struct {
-	name    string
-	proxies []C.Proxy
-	rawURL  string
-	fast    C.Proxy
-	delay   time.Duration
-	done    chan struct{}
-}
-
-func (u *URLTest) Name() string {
-	return u.name
-}
-
-func (u *URLTest) Type() C.AdapterType {
-	return C.URLTest
-}
-
-func (u *URLTest) Now() string {
-	return u.fast.Name()
-}
-
-func (u *URLTest) Generator(addr *C.Addr) (adapter C.ProxyAdapter, err error) {
-	return u.fast.Generator(addr)
-}
-
-func (u *URLTest) Close() {
-	u.done <- struct{}{}
-}
-
-func (u *URLTest) loop() {
-	tick := time.NewTicker(u.delay)
-	go u.speedTest()
-Loop:
-	for {
-		select {
-		case <-tick.C:
-			go u.speedTest()
-		case <-u.done:
-			break Loop
-		}
-	}
-}
-
-func (u *URLTest) speedTest() {
-	wg := sync.WaitGroup{}
-	wg.Add(len(u.proxies))
-	c := make(chan interface{})
-	fast := selectFast(c)
-	timer := time.NewTimer(u.delay)
-
-	for _, p := range u.proxies {
-		go func(p C.Proxy) {
-			_, err := DelayTest(p, u.rawURL)
-			if err == nil {
-				c <- p
-			}
-			wg.Done()
-		}(p)
-	}
-
-	go func() {
-		wg.Wait()
-		close(c)
-	}()
-
-	select {
-	case <-timer.C:
-		// Wait for fast to return or close.
-		<-fast
-	case p, open := <-fast:
-		if open {
-			u.fast = p.(C.Proxy)
-		}
-	}
-}
-
-func NewURLTest(name string, proxies []C.Proxy, rawURL string, delay time.Duration) (*URLTest, error) {
-	_, err := urlToAddr(rawURL)
-	if err != nil {
-		return nil, err
-	}
-
-	urlTest := &URLTest{
-		name:    name,
-		proxies: proxies[:],
-		rawURL:  rawURL,
-		fast:    proxies[0],
-		delay:   delay,
-		done:    make(chan struct{}),
-	}
-	go urlTest.loop()
-	return urlTest, nil
-}

adapters/remote/util.go

@@ -1,93 +0,0 @@
-package adapters
-
-import (
-	"fmt"
-	"net"
-	"net/http"
-	"net/url"
-	"time"
-
-	C "github.com/Dreamacro/clash/constant"
-)
-
-// DelayTest get the delay for the specified URL
-func DelayTest(proxy C.Proxy, url string) (t int16, err error) {
-	addr, err := urlToAddr(url)
-	if err != nil {
-		return
-	}
-
-	start := time.Now()
-	instance, err := proxy.Generator(&addr)
-	if err != nil {
-		return
-	}
-	defer instance.Close()
-	transport := &http.Transport{
-		Dial: func(string, string) (net.Conn, error) {
-			return instance.Conn(), nil
-		},
-		// from http.DefaultTransport
-		MaxIdleConns:          100,
-		IdleConnTimeout:       90 * time.Second,
-		TLSHandshakeTimeout:   10 * time.Second,
-		ExpectContinueTimeout: 1 * time.Second,
-	}
-	client := http.Client{Transport: transport}
-	req, err := client.Get(url)
-	if err != nil {
-		return
-	}
-	req.Body.Close()
-	t = int16(time.Since(start) / time.Millisecond)
-	return
-}
-
-func urlToAddr(rawURL string) (addr C.Addr, err error) {
-	u, err := url.Parse(rawURL)
-	if err != nil {
-		return
-	}
-
-	port := u.Port()
-	if port == "" {
-		if u.Scheme == "https" {
-			port = "443"
-		} else if u.Scheme == "http" {
-			port = "80"
-		} else {
-			err = fmt.Errorf("%s scheme not Support", rawURL)
-			return
-		}
-	}
-
-	addr = C.Addr{
-		AddrType: C.AtypDomainName,
-		Host:     u.Hostname(),
-		IP:       nil,
-		Port:     port,
-	}
-	return
-}
-
-func selectFast(in chan interface{}) chan interface{} {
-	out := make(chan interface{})
-	go func() {
-		p, open := <-in
-		if open {
-			out <- p
-		}
-		close(out)
-		for range in {
-		}
-	}()
-
-	return out
-}
-
-func tcpKeepAlive(c net.Conn) {
-	if tcp, ok := c.(*net.TCPConn); ok {
-		tcp.SetKeepAlive(true)
-		tcp.SetKeepAlivePeriod(3 * time.Minute)
-	}
-}

adapters/remote/vmess.go

@@ -1,95 +0,0 @@
-package adapters
-
-import (
-	"fmt"
-	"net"
-	"strconv"
-	"strings"
-
-	"github.com/Dreamacro/clash/common/vmess"
-	C "github.com/Dreamacro/clash/constant"
-)
-
-// VmessAdapter is a vmess adapter
-type VmessAdapter struct {
-	conn net.Conn
-}
-
-// Close is used to close connection
-func (v *VmessAdapter) Close() {
-	v.conn.Close()
-}
-
-func (v *VmessAdapter) Conn() net.Conn {
-	return v.conn
-}
-
-type Vmess struct {
-	name   string
-	server string
-	client *vmess.Client
-}
-
-func (ss *Vmess) Name() string {
-	return ss.name
-}
-
-func (ss *Vmess) Type() C.AdapterType {
-	return C.Vmess
-}
-
-func (ss *Vmess) Generator(addr *C.Addr) (adapter C.ProxyAdapter, err error) {
-	c, err := net.Dial("tcp", ss.server)
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error", ss.server)
-	}
-	tcpKeepAlive(c)
-	c = ss.client.New(c, parseVmessAddr(addr))
-	return &VmessAdapter{conn: c}, err
-}
-
-func NewVmess(name string, server string, uuid string, alterID uint16, security string, option map[string]string) (*Vmess, error) {
-	security = strings.ToLower(security)
-	client, err := vmess.NewClient(vmess.Config{
-		UUID:     uuid,
-		AlterID:  alterID,
-		Security: security,
-		TLS:      option["tls"] == "true",
-	})
-	if err != nil {
-		return nil, err
-	}
-
-	return &Vmess{
-		name:   name,
-		server: server,
-		client: client,
-	}, nil
-}
-
-func parseVmessAddr(info *C.Addr) *vmess.DstAddr {
-	var addrType byte
-	var addr []byte
-	switch info.AddrType {
-	case C.AtypIPv4:
-		addrType = byte(vmess.AtypIPv4)
-		addr = make([]byte, net.IPv4len)
-		copy(addr[:], info.IP.To4())
-	case C.AtypIPv6:
-		addrType = byte(vmess.AtypIPv6)
-		addr = make([]byte, net.IPv6len)
-		copy(addr[:], info.IP.To16())
-	case C.AtypDomainName:
-		addrType = byte(vmess.AtypDomainName)
-		addr = make([]byte, len(info.Host)+1)
-		addr[0] = byte(len(info.Host))
-		copy(addr[1:], []byte(info.Host))
-	}
-
-	port, _ := strconv.Atoi(info.Port)
-	return &vmess.DstAddr{
-		AddrType: addrType,
-		Addr:     addr,
-		Port:     uint(port),
-	}
-}

common/cache/cache.go

@@ -0,0 +1,106 @@
+package cache
+
+import (
+	"runtime"
+	"sync"
+	"time"
+)
+
+// Cache store element with a expired time
+type Cache struct {
+	*cache
+}
+
+type cache struct {
+	mapping sync.Map
+	janitor *janitor
+}
+
+type element struct {
+	Expired time.Time
+	Payload interface{}
+}
+
+// Put element in Cache with its ttl
+func (c *cache) Put(key interface{}, payload interface{}, ttl time.Duration) {
+	c.mapping.Store(key, &element{
+		Payload: payload,
+		Expired: time.Now().Add(ttl),
+	})
+}
+
+// Get element in Cache, and drop when it expired
+func (c *cache) Get(key interface{}) interface{} {
+	item, exist := c.mapping.Load(key)
+	if !exist {
+		return nil
+	}
+	elm := item.(*element)
+	// expired
+	if time.Since(elm.Expired) > 0 {
+		c.mapping.Delete(key)
+		return nil
+	}
+	return elm.Payload
+}
+
+// GetWithExpire element in Cache with Expire Time
+func (c *cache) GetWithExpire(key interface{}) (payload interface{}, expired time.Time) {
+	item, exist := c.mapping.Load(key)
+	if !exist {
+		return
+	}
+	elm := item.(*element)
+	// expired
+	if time.Since(elm.Expired) > 0 {
+		c.mapping.Delete(key)
+		return
+	}
+	return elm.Payload, elm.Expired
+}
+
+func (c *cache) cleanup() {
+	c.mapping.Range(func(k, v interface{}) bool {
+		key := k.(string)
+		elm := v.(*element)
+		if time.Since(elm.Expired) > 0 {
+			c.mapping.Delete(key)
+		}
+		return true
+	})
+}
+
+type janitor struct {
+	interval time.Duration
+	stop     chan struct{}
+}
+
+func (j *janitor) process(c *cache) {
+	ticker := time.NewTicker(j.interval)
+	for {
+		select {
+		case <-ticker.C:
+			c.cleanup()
+		case <-j.stop:
+			ticker.Stop()
+			return
+		}
+	}
+}
+
+func stopJanitor(c *Cache) {
+	c.janitor.stop <- struct{}{}
+}
+
+// New return *Cache
+func New(interval time.Duration) *Cache {
+	j := &janitor{
+		interval: interval,
+		stop:     make(chan struct{}),
+	}
+	c := &cache{janitor: j}
+	go j.process(c)
+	C := &Cache{c}
+	runtime.SetFinalizer(C, stopJanitor)
+	return C
+}

common/cache/cache_test.go

@@ -0,0 +1,70 @@
+package cache
+
+import (
+	"runtime"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestCache_Basic(t *testing.T) {
+	interval := 200 * time.Millisecond
+	ttl := 20 * time.Millisecond
+	c := New(interval)
+	c.Put("int", 1, ttl)
+	c.Put("string", "a", ttl)
+
+	i := c.Get("int")
+	assert.Equal(t, i.(int), 1, "should recv 1")
+
+	s := c.Get("string")
+	assert.Equal(t, s.(string), "a", "should recv 'a'")
+}
+
+func TestCache_TTL(t *testing.T) {
+	interval := 200 * time.Millisecond
+	ttl := 20 * time.Millisecond
+	now := time.Now()
+	c := New(interval)
+	c.Put("int", 1, ttl)
+	c.Put("int2", 2, ttl)
+
+	i := c.Get("int")
+	_, expired := c.GetWithExpire("int2")
+	assert.Equal(t, i.(int), 1, "should recv 1")
+	assert.True(t, now.Before(expired))
+
+	time.Sleep(ttl * 2)
+	i = c.Get("int")
+	j, _ := c.GetWithExpire("int2")
+	assert.Nil(t, i, "should recv nil")
+	assert.Nil(t, j, "should recv nil")
+}
+
+func TestCache_AutoCleanup(t *testing.T) {
+	interval := 10 * time.Millisecond
+	ttl := 15 * time.Millisecond
+	c := New(interval)
+	c.Put("int", 1, ttl)
+
+	time.Sleep(ttl * 2)
+	i := c.Get("int")
+	j, _ := c.GetWithExpire("int")
+	assert.Nil(t, i, "should recv nil")
+	assert.Nil(t, j, "should recv nil")
+}
+
+func TestCache_AutoGC(t *testing.T) {
+	sign := make(chan struct{})
+	go func() {
+		interval := 10 * time.Millisecond
+		ttl := 15 * time.Millisecond
+		c := New(interval)
+		c.Put("int", 1, ttl)
+		sign <- struct{}{}
+	}()
+
+	<-sign
+	runtime.GC()
+}

common/cache/lrucache.go

@@ -0,0 +1,171 @@
+package cache
+
+// Modified by https://github.com/die-net/lrucache
+
+import (
+	"container/list"
+	"sync"
+	"time"
+)
+
+// 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) {
+		l.updateAgeOnGet = true
+	}
+}
+
+// WithAge defined element max age (second)
+func WithAge(maxAge int64) Option {
+	return func(l *LruCache) {
+		l.maxAge = maxAge
+	}
+}
+
+// WithSize defined max length of LruCache
+func WithSize(maxSize int) Option {
+	return func(l *LruCache) {
+		l.maxSize = maxSize
+	}
+}
+
+// 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.
+type LruCache struct {
+	maxAge         int64
+	maxSize        int
+	mu             sync.Mutex
+	cache          map[interface{}]*list.Element
+	lru            *list.List // Front is least-recent
+	updateAgeOnGet bool
+	onEvict        EvictCallback
+}
+
+// NewLRUCache creates an LruCache
+func NewLRUCache(options ...Option) *LruCache {
+	lc := &LruCache{
+		lru:   list.New(),
+		cache: make(map[interface{}]*list.Element),
+	}
+
+	for _, option := range options {
+		option(lc)
+	}
+
+	return lc
+}
+
+// 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 {
+		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
+}
+
+// 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()
+	defer c.mu.Unlock()
+
+	_, ok := c.cache[key]
+	return ok
+}
+
+// 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
+	}
+
+	if le, ok := c.cache[key]; ok {
+		c.lru.MoveToBack(le)
+		e := le.Value.(*entry)
+		e.value = value
+		e.expires = expires
+	} else {
+		e := &entry{key: key, value: value, expires: expires}
+		c.cache[key] = c.lru.PushBack(e)
+
+		if c.maxSize > 0 {
+			if len := c.lru.Len(); len > c.maxSize {
+				c.deleteElement(c.lru.Front())
+			}
+		}
+	}
+
+	c.maybeDeleteOldest()
+}
+
+// Delete removes the value associated with a key.
+func (c *LruCache) Delete(key string) {
+	c.mu.Lock()
+
+	if le, ok := c.cache[key]; ok {
+		c.deleteElement(le)
+	}
+
+	c.mu.Unlock()
+}
+
+func (c *LruCache) maybeDeleteOldest() {
+	if 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)
+		}
+	}
+}
+
+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 {
+	key     interface{}
+	value   interface{}
+	expires int64
+}

common/cache/lrucache_test.go

@@ -0,0 +1,138 @@
+package cache
+
+import (
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var entries = []struct {
+	key   string
+	value string
+}{
+	{"1", "one"},
+	{"2", "two"},
+	{"3", "three"},
+	{"4", "four"},
+	{"5", "five"},
+}
+
+func TestLRUCache(t *testing.T) {
+	c := NewLRUCache()
+
+	for _, e := range entries {
+		c.Set(e.key, e.value)
+	}
+
+	c.Delete("missing")
+	_, ok := c.Get("missing")
+	assert.False(t, ok)
+
+	for _, e := range entries {
+		value, ok := c.Get(e.key)
+		if assert.True(t, ok) {
+			assert.Equal(t, e.value, value.(string))
+		}
+	}
+
+	for _, e := range entries {
+		c.Delete(e.key)
+
+		_, ok := c.Get(e.key)
+		assert.False(t, ok)
+	}
+}
+
+func TestLRUMaxAge(t *testing.T) {
+	c := NewLRUCache(WithAge(86400))
+
+	now := time.Now().Unix()
+	expected := now + 86400
+
+	// Add one expired entry
+	c.Set("foo", "bar")
+	c.lru.Back().Value.(*entry).expires = now
+
+	// Reset
+	c.Set("foo", "bar")
+	e := c.lru.Back().Value.(*entry)
+	assert.True(t, e.expires >= now)
+	c.lru.Back().Value.(*entry).expires = now
+
+	// Set a few and verify expiration times
+	for _, s := range entries {
+		c.Set(s.key, s.value)
+		e := c.lru.Back().Value.(*entry)
+		assert.True(t, e.expires >= expected && e.expires <= expected+10)
+	}
+
+	// Make sure we can get them all
+	for _, s := range entries {
+		_, ok := c.Get(s.key)
+		assert.True(t, ok)
+	}
+
+	// Expire all entries
+	for _, s := range entries {
+		le, ok := c.cache[s.key]
+		if assert.True(t, ok) {
+			le.Value.(*entry).expires = now
+		}
+	}
+
+	// Get one expired entry, which should clear all expired entries
+	_, ok := c.Get("3")
+	assert.False(t, ok)
+	assert.Equal(t, c.lru.Len(), 0)
+}
+
+func TestLRUpdateOnGet(t *testing.T) {
+	c := NewLRUCache(WithAge(86400), WithUpdateAgeOnGet())
+
+	now := time.Now().Unix()
+	expires := now + 86400/2
+
+	// Add one expired entry
+	c.Set("foo", "bar")
+	c.lru.Back().Value.(*entry).expires = expires
+
+	_, ok := c.Get("foo")
+	assert.True(t, ok)
+	assert.True(t, c.lru.Back().Value.(*entry).expires > expires)
+}
+
+func TestMaxSize(t *testing.T) {
+	c := NewLRUCache(WithSize(2))
+	// Add one expired entry
+	c.Set("foo", "bar")
+	_, ok := c.Get("foo")
+	assert.True(t, ok)
+
+	c.Set("bar", "foo")
+	c.Set("baz", "foo")
+
+	_, 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)
+}

common/murmur3/murmur.go

@@ -0,0 +1,50 @@
+package murmur3
+
+type bmixer interface {
+	bmix(p []byte) (tail []byte)
+	Size() (n int)
+	reset()
+}
+
+type digest struct {
+	clen int      // Digested input cumulative length.
+	tail []byte   // 0 to Size()-1 bytes view of `buf'.
+	buf  [16]byte // Expected (but not required) to be Size() large.
+	seed uint32   // Seed for initializing the hash.
+	bmixer
+}
+
+func (d *digest) BlockSize() int { return 1 }
+
+func (d *digest) Write(p []byte) (n int, err error) {
+	n = len(p)
+	d.clen += n
+
+	if len(d.tail) > 0 {
+		// Stick back pending bytes.
+		nfree := d.Size() - len(d.tail) // nfree ∈ [1, d.Size()-1].
+		if nfree < len(p) {
+			// One full block can be formed.
+			block := append(d.tail, p[:nfree]...)
+			p = p[nfree:]
+			_ = d.bmix(block) // No tail.
+		} else {
+			// Tail's buf is large enough to prevent reallocs.
+			p = append(d.tail, p...)
+		}
+	}
+
+	d.tail = d.bmix(p)
+
+	// Keep own copy of the 0 to Size()-1 pending bytes.
+	nn := copy(d.buf[:], d.tail)
+	d.tail = d.buf[:nn]
+
+	return n, nil
+}
+
+func (d *digest) Reset() {
+	d.clen = 0
+	d.tail = nil
+	d.bmixer.reset()
+}

common/murmur3/murmur32.go

@@ -0,0 +1,145 @@
+package murmur3
+
+// https://github.com/spaolacci/murmur3/blob/master/murmur32.go
+
+import (
+	"hash"
+	"math/bits"
+	"unsafe"
+)
+
+// Make sure interfaces are correctly implemented.
+var (
+	_ hash.Hash32 = new(digest32)
+	_ bmixer      = new(digest32)
+)
+
+const (
+	c1_32 uint32 = 0xcc9e2d51
+	c2_32 uint32 = 0x1b873593
+)
+
+// digest32 represents a partial evaluation of a 32 bites hash.
+type digest32 struct {
+	digest
+	h1 uint32 // Unfinalized running hash.
+}
+
+// New32 returns new 32-bit hasher
+func New32() hash.Hash32 { return New32WithSeed(0) }
+
+// New32WithSeed returns new 32-bit hasher set with explicit seed value
+func New32WithSeed(seed uint32) hash.Hash32 {
+	d := new(digest32)
+	d.seed = seed
+	d.bmixer = d
+	d.Reset()
+	return d
+}
+
+func (d *digest32) Size() int { return 4 }
+
+func (d *digest32) reset() { d.h1 = d.seed }
+
+func (d *digest32) Sum(b []byte) []byte {
+	h := d.Sum32()
+	return append(b, byte(h>>24), byte(h>>16), byte(h>>8), byte(h))
+}
+
+// Digest as many blocks as possible.
+func (d *digest32) bmix(p []byte) (tail []byte) {
+	h1 := d.h1
+
+	nblocks := len(p) / 4
+	for i := 0; i < nblocks; i++ {
+		k1 := *(*uint32)(unsafe.Pointer(&p[i*4]))
+
+		k1 *= c1_32
+		k1 = bits.RotateLeft32(k1, 15)
+		k1 *= c2_32
+
+		h1 ^= k1
+		h1 = bits.RotateLeft32(h1, 13)
+		h1 = h1*4 + h1 + 0xe6546b64
+	}
+	d.h1 = h1
+	return p[nblocks*d.Size():]
+}
+
+func (d *digest32) Sum32() (h1 uint32) {
+
+	h1 = d.h1
+
+	var k1 uint32
+	switch len(d.tail) & 3 {
+	case 3:
+		k1 ^= uint32(d.tail[2]) << 16
+		fallthrough
+	case 2:
+		k1 ^= uint32(d.tail[1]) << 8
+		fallthrough
+	case 1:
+		k1 ^= uint32(d.tail[0])
+		k1 *= c1_32
+		k1 = bits.RotateLeft32(k1, 15)
+		k1 *= c2_32
+		h1 ^= k1
+	}
+
+	h1 ^= uint32(d.clen)
+
+	h1 ^= h1 >> 16
+	h1 *= 0x85ebca6b
+	h1 ^= h1 >> 13
+	h1 *= 0xc2b2ae35
+	h1 ^= h1 >> 16
+
+	return h1
+}
+
+func Sum32(data []byte) uint32 { return Sum32WithSeed(data, 0) }
+
+func Sum32WithSeed(data []byte, seed uint32) uint32 {
+	h1 := seed
+
+	nblocks := len(data) / 4
+	for i := 0; i < nblocks; i++ {
+		k1 := *(*uint32)(unsafe.Pointer(&data[i*4]))
+
+		k1 *= c1_32
+		k1 = bits.RotateLeft32(k1, 15)
+		k1 *= c2_32
+
+		h1 ^= k1
+		h1 = bits.RotateLeft32(h1, 13)
+		h1 = h1*4 + h1 + 0xe6546b64
+	}
+
+	tail := data[nblocks*4:]
+
+	var k1 uint32
+	switch len(tail) & 3 {
+	case 3:
+		k1 ^= uint32(tail[2]) << 16
+		fallthrough
+	case 2:
+		k1 ^= uint32(tail[1]) << 8
+		fallthrough
+	case 1:
+		k1 ^= uint32(tail[0])
+		k1 *= c1_32
+		k1 = bits.RotateLeft32(k1, 15)
+		k1 *= c2_32
+		h1 ^= k1
+	}
+
+	h1 ^= uint32(len(data))
+
+	h1 ^= h1 >> 16
+	h1 *= 0x85ebca6b
+	h1 ^= h1 >> 13
+	h1 *= 0xc2b2ae35
+	h1 ^= h1 >> 16
+
+	return h1
+}

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

@@ -0,0 +1,89 @@
+package picker
+
+import (
+	"context"
+	"sync"
+	"time"
+)
+
+// Picker provides synchronization, and Context cancelation
+// for groups of goroutines working on subtasks of a common task.
+// Inspired by errGroup
+type Picker struct {
+	ctx    context.Context
+	cancel func()
+
+	wg sync.WaitGroup
+
+	once   sync.Once
+	result interface{}
+
+	firstDone chan struct{}
+}
+
+func newPicker(ctx context.Context, cancel func()) *Picker {
+	return &Picker{
+		ctx:       ctx,
+		cancel:    cancel,
+		firstDone: make(chan struct{}, 1),
+	}
+}
+
+// WithContext returns a new Picker and an associated Context derived from ctx.
+// and cancel when first element return.
+func WithContext(ctx context.Context) (*Picker, context.Context) {
+	ctx, cancel := context.WithCancel(ctx)
+	return newPicker(ctx, cancel), ctx
+}
+
+// WithTimeout returns a new Picker and an associated Context derived from ctx with timeout.
+func WithTimeout(ctx context.Context, timeout time.Duration) (*Picker, context.Context) {
+	ctx, cancel := context.WithTimeout(ctx, timeout)
+	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{} {
+	p.wg.Wait()
+	if p.cancel != nil {
+		p.cancel()
+	}
+	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
+	}
+}
+
+// Go calls the given function in a new goroutine.
+// The first call to return a nil error cancels the group; its result will be returned by Wait.
+func (p *Picker) Go(f func() (interface{}, error)) {
+	p.wg.Add(1)
+
+	go func() {
+		defer p.wg.Done()
+
+		if ret, err := f(); err == nil {
+			p.once.Do(func() {
+				p.result = ret
+				p.firstDone <- struct{}{}
+				if p.cancel != nil {
+					p.cancel()
+				}
+			})
+		}
+	}()
+}

common/picker/picker_test.go

@@ -0,0 +1,66 @@
+package picker
+
+import (
+	"context"
+	"testing"
+	"time"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func sleepAndSend(ctx context.Context, delay int, input interface{}) func() (interface{}, error) {
+	return func() (interface{}, error) {
+		timer := time.NewTimer(time.Millisecond * time.Duration(delay))
+		select {
+		case <-timer.C:
+			return input, nil
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		}
+	}
+}
+
+func TestPicker_Basic(t *testing.T) {
+	picker, ctx := WithContext(context.Background())
+	picker.Go(sleepAndSend(ctx, 30, 2))
+	picker.Go(sleepAndSend(ctx, 20, 1))
+
+	number := picker.Wait()
+	assert.NotNil(t, number)
+	assert.Equal(t, number.(int), 1)
+}
+
+func TestPicker_Timeout(t *testing.T) {
+	picker, ctx := WithTimeout(context.Background(), time.Millisecond*5)
+	picker.Go(sleepAndSend(ctx, 20, 1))
+
+	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)
+}

common/pool/pool.go

@@ -0,0 +1,15 @@
+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
+)
+
+// BufPool provide buffer for relay
+var BufPool = sync.Pool{New: func() interface{} { return make([]byte, bufferSize) }}

common/queue/queue.go

@@ -0,0 +1,71 @@
+package queue
+
+import (
+	"sync"
+)
+
+// Queue is a simple concurrent safe queue
+type Queue struct {
+	items []interface{}
+	lock  sync.RWMutex
+}
+
+// Put add the item to the queue.
+func (q *Queue) Put(items ...interface{}) {
+	if len(items) == 0 {
+		return
+	}
+
+	q.lock.Lock()
+	q.items = append(q.items, items...)
+	q.lock.Unlock()
+}
+
+// Pop returns the head of items.
+func (q *Queue) Pop() interface{} {
+	if len(q.items) == 0 {
+		return nil
+	}
+
+	q.lock.Lock()
+	head := q.items[0]
+	q.items = q.items[1:]
+	q.lock.Unlock()
+	return head
+}
+
+// Last returns the last of item.
+func (q *Queue) Last() interface{} {
+	if len(q.items) == 0 {
+		return nil
+	}
+
+	q.lock.RLock()
+	last := q.items[len(q.items)-1]
+	q.lock.RUnlock()
+	return last
+}
+
+// Copy get the copy of queue.
+func (q *Queue) Copy() []interface{} {
+	items := []interface{}{}
+	q.lock.RLock()
+	items = append(items, q.items...)
+	q.lock.RUnlock()
+	return items
+}
+
+// Len returns the number of items in this queue.
+func (q *Queue) Len() int64 {
+	q.lock.Lock()
+	defer q.lock.Unlock()
+
+	return int64(len(q.items))
+}
+
+// New is a constructor for a new concurrent safe queue.
+func New(hint int64) *Queue {
+	return &Queue{
+		items: make([]interface{}, 0, hint),
+	}
+}

common/singledo/singledo.go

@@ -0,0 +1,55 @@
+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 NewSingle(wait time.Duration) *Single {
+	return &Single{wait: wait}
+}

common/singledo/singledo_test.go

@@ -0,0 +1,53 @@
+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 = 10
+	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, 9, 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)
+}

common/structure/structure.go

@@ -0,0 +1,394 @@
+package structure
+
+// references: https://github.com/mitchellh/mapstructure
+
+import (
+	"fmt"
+	"reflect"
+	"strconv"
+	"strings"
+)
+
+// Option is the configuration that is used to create a new decoder
+type Option struct {
+	TagName          string
+	WeaklyTypedInput bool
+}
+
+// Decoder is the core of structure
+type Decoder struct {
+	option *Option
+}
+
+// NewDecoder return a Decoder by Option
+func NewDecoder(option Option) *Decoder {
+	if option.TagName == "" {
+		option.TagName = "structure"
+	}
+	return &Decoder{option: &option}
+}
+
+// Decode transform a map[string]interface{} to a struct
+func (d *Decoder) Decode(src map[string]interface{}, dst interface{}) error {
+	if reflect.TypeOf(dst).Kind() != reflect.Ptr {
+		return fmt.Errorf("Decode must recive a ptr struct")
+	}
+	t := reflect.TypeOf(dst).Elem()
+	v := reflect.ValueOf(dst).Elem()
+	for idx := 0; idx < v.NumField(); idx++ {
+		field := t.Field(idx)
+
+		tag := field.Tag.Get(d.option.TagName)
+		str := strings.SplitN(tag, ",", 2)
+		key := str[0]
+		omitempty := false
+		if len(str) > 1 {
+			omitempty = str[1] == "omitempty"
+		}
+
+		value, ok := src[key]
+		if !ok || value == nil {
+			if omitempty {
+				continue
+			}
+			return fmt.Errorf("key '%s' missing", key)
+		}
+
+		err := d.decode(key, value, v.Field(idx))
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (d *Decoder) decode(name string, data interface{}, val reflect.Value) error {
+	switch val.Kind() {
+	case reflect.Int:
+		return d.decodeInt(name, data, val)
+	case reflect.String:
+		return d.decodeString(name, data, val)
+	case reflect.Bool:
+		return d.decodeBool(name, data, val)
+	case reflect.Slice:
+		return d.decodeSlice(name, data, val)
+	case reflect.Map:
+		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())
+	}
+}
+
+func (d *Decoder) decodeInt(name string, data interface{}, val reflect.Value) (err error) {
+	dataVal := reflect.ValueOf(data)
+	kind := dataVal.Kind()
+	switch {
+	case kind == reflect.Int:
+		val.SetInt(dataVal.Int())
+	case kind == reflect.String && d.option.WeaklyTypedInput:
+		var i int64
+		i, err = strconv.ParseInt(dataVal.String(), 0, val.Type().Bits())
+		if err == nil {
+			val.SetInt(i)
+		} else {
+			err = fmt.Errorf("cannot parse '%s' as int: %s", name, err)
+		}
+	default:
+		err = fmt.Errorf(
+			"'%s' expected type '%s', got unconvertible type '%s'",
+			name, val.Type(), dataVal.Type(),
+		)
+	}
+	return err
+}
+
+func (d *Decoder) decodeString(name string, data interface{}, val reflect.Value) (err error) {
+	dataVal := reflect.ValueOf(data)
+	kind := dataVal.Kind()
+	switch {
+	case kind == reflect.String:
+		val.SetString(dataVal.String())
+	case kind == reflect.Int && d.option.WeaklyTypedInput:
+		val.SetString(strconv.FormatInt(dataVal.Int(), 10))
+	default:
+		err = fmt.Errorf(
+			"'%s' expected type '%s', got unconvertible type '%s'",
+			name, val.Type(), dataVal.Type(),
+		)
+	}
+	return err
+}
+
+func (d *Decoder) decodeBool(name string, data interface{}, val reflect.Value) (err error) {
+	dataVal := reflect.ValueOf(data)
+	kind := dataVal.Kind()
+	switch {
+	case kind == reflect.Bool:
+		val.SetBool(dataVal.Bool())
+	case kind == reflect.Int && d.option.WeaklyTypedInput:
+		val.SetBool(dataVal.Int() != 0)
+	default:
+		err = fmt.Errorf(
+			"'%s' expected type '%s', got unconvertible type '%s'",
+			name, val.Type(), dataVal.Type(),
+		)
+	}
+	return err
+}
+
+func (d *Decoder) decodeSlice(name string, data interface{}, val reflect.Value) error {
+	dataVal := reflect.Indirect(reflect.ValueOf(data))
+	valType := val.Type()
+	valElemType := valType.Elem()
+
+	if dataVal.Kind() != reflect.Slice {
+		return fmt.Errorf("'%s' is not a slice", name)
+	}
+
+	valSlice := val
+	for i := 0; i < dataVal.Len(); i++ {
+		currentData := dataVal.Index(i).Interface()
+		for valSlice.Len() <= i {
+			valSlice = reflect.Append(valSlice, reflect.Zero(valElemType))
+		}
+		currentField := valSlice.Index(i)
+
+		fieldName := fmt.Sprintf("%s[%d]", name, i)
+		if err := d.decode(fieldName, currentData, currentField); err != nil {
+			return err
+		}
+	}
+
+	val.Set(valSlice)
+	return nil
+}
+
+func (d *Decoder) decodeMap(name string, data interface{}, val reflect.Value) error {
+	valType := val.Type()
+	valKeyType := valType.Key()
+	valElemType := valType.Elem()
+
+	valMap := val
+
+	if valMap.IsNil() {
+		mapType := reflect.MapOf(valKeyType, valElemType)
+		valMap = reflect.MakeMap(mapType)
+	}
+
+	dataVal := reflect.Indirect(reflect.ValueOf(data))
+	if dataVal.Kind() != reflect.Map {
+		return fmt.Errorf("'%s' expected a map, got '%s'", name, dataVal.Kind())
+	}
+
+	return d.decodeMapFromMap(name, dataVal, val, valMap)
+}
+
+func (d *Decoder) decodeMapFromMap(name string, dataVal reflect.Value, val reflect.Value, valMap reflect.Value) error {
+	valType := val.Type()
+	valKeyType := valType.Key()
+	valElemType := valType.Elem()
+
+	errors := make([]string, 0)
+
+	if dataVal.Len() == 0 {
+		if dataVal.IsNil() {
+			if !val.IsNil() {
+				val.Set(dataVal)
+			}
+		} else {
+			val.Set(valMap)
+		}
+
+		return nil
+	}
+
+	for _, k := range dataVal.MapKeys() {
+		fieldName := fmt.Sprintf("%s[%s]", name, k)
+
+		currentKey := reflect.Indirect(reflect.New(valKeyType))
+		if err := d.decode(fieldName, k.Interface(), currentKey); err != nil {
+			errors = append(errors, err.Error())
+			continue
+		}
+
+		v := dataVal.MapIndex(k).Interface()
+		currentVal := reflect.Indirect(reflect.New(valElemType))
+		if err := d.decode(fieldName, v, currentVal); err != nil {
+			errors = append(errors, err.Error())
+			continue
+		}
+
+		valMap.SetMapIndex(currentKey, currentVal)
+	}
+
+	val.Set(valMap)
+
+	if len(errors) > 0 {
+		return fmt.Errorf(strings.Join(errors, ","))
+	}
+
+	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)
+	return nil
+}

common/structure/structure_test.go

@@ -0,0 +1,141 @@
+package structure
+
+import (
+	"reflect"
+	"testing"
+)
+
+var decoder = NewDecoder(Option{TagName: "test"})
+var weakTypeDecoder = NewDecoder(Option{TagName: "test", WeaklyTypedInput: true})
+
+type Baz struct {
+	Foo int    `test:"foo"`
+	Bar string `test:"bar"`
+}
+
+type BazSlice struct {
+	Foo int      `test:"foo"`
+	Bar []string `test:"bar"`
+}
+
+type BazOptional struct {
+	Foo int    `test:"foo,omitempty"`
+	Bar string `test:"bar,omitempty"`
+}
+
+func TestStructure_Basic(t *testing.T) {
+	rawMap := map[string]interface{}{
+		"foo":   1,
+		"bar":   "test",
+		"extra": false,
+	}
+
+	goal := &Baz{
+		Foo: 1,
+		Bar: "test",
+	}
+
+	s := &Baz{}
+	err := decoder.Decode(rawMap, s)
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if !reflect.DeepEqual(s, goal) {
+		t.Fatalf("bad: %#v", s)
+	}
+}
+
+func TestStructure_Slice(t *testing.T) {
+	rawMap := map[string]interface{}{
+		"foo": 1,
+		"bar": []string{"one", "two"},
+	}
+
+	goal := &BazSlice{
+		Foo: 1,
+		Bar: []string{"one", "two"},
+	}
+
+	s := &BazSlice{}
+	err := decoder.Decode(rawMap, s)
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if !reflect.DeepEqual(s, goal) {
+		t.Fatalf("bad: %#v", s)
+	}
+}
+
+func TestStructure_Optional(t *testing.T) {
+	rawMap := map[string]interface{}{
+		"foo": 1,
+	}
+
+	goal := &BazOptional{
+		Foo: 1,
+	}
+
+	s := &BazOptional{}
+	err := decoder.Decode(rawMap, s)
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if !reflect.DeepEqual(s, goal) {
+		t.Fatalf("bad: %#v", s)
+	}
+}
+
+func TestStructure_MissingKey(t *testing.T) {
+	rawMap := map[string]interface{}{
+		"foo": 1,
+	}
+
+	s := &Baz{}
+	err := decoder.Decode(rawMap, s)
+	if err == nil {
+		t.Fatalf("should throw error: %#v", s)
+	}
+}
+
+func TestStructure_ParamError(t *testing.T) {
+	rawMap := map[string]interface{}{}
+	s := Baz{}
+	err := decoder.Decode(rawMap, s)
+	if err == nil {
+		t.Fatalf("should throw error: %#v", s)
+	}
+}
+
+func TestStructure_SliceTypeError(t *testing.T) {
+	rawMap := map[string]interface{}{
+		"foo": 1,
+		"bar": []int{1, 2},
+	}
+
+	s := &BazSlice{}
+	err := decoder.Decode(rawMap, s)
+	if err == nil {
+		t.Fatalf("should throw error: %#v", s)
+	}
+}
+
+func TestStructure_WeakType(t *testing.T) {
+	rawMap := map[string]interface{}{
+		"foo": "1",
+		"bar": []int{1},
+	}
+
+	goal := &BazSlice{
+		Foo: 1,
+		Bar: []string{"1"},
+	}
+
+	s := &BazSlice{}
+	err := weakTypeDecoder.Decode(rawMap, s)
+	if err != nil {
+		t.Fatal(err.Error())
+	}
+	if !reflect.DeepEqual(s, goal) {
+		t.Fatalf("bad: %#v", s)
+	}
+}

common/vmess/vmess.go

@@ -1,117 +0,0 @@
-package vmess
-
-import (
-	"crypto/tls"
-	"fmt"
-	"math/rand"
-	"net"
-	"runtime"
-
-	"github.com/gofrs/uuid"
-)
-
-// Version of vmess
-const Version byte = 1
-
-// Request Options
-const (
-	OptionChunkStream  byte = 1
-	OptionChunkMasking byte = 4
-)
-
-// Security type vmess
-type Security = byte
-
-// Cipher types
-const (
-	SecurityAES128GCM        Security = 3
-	SecurityCHACHA20POLY1305 Security = 4
-	SecurityNone             Security = 5
-)
-
-// CipherMapping return
-var CipherMapping = map[string]byte{
-	"none":              SecurityNone,
-	"aes-128-gcm":       SecurityAES128GCM,
-	"chacha20-poly1305": SecurityCHACHA20POLY1305,
-}
-
-var tlsConfig = &tls.Config{
-	InsecureSkipVerify: true,
-}
-
-// Command types
-const (
-	CommandTCP byte = 1
-	CommandUDP byte = 2
-)
-
-// Addr types
-const (
-	AtypIPv4       byte = 1
-	AtypDomainName byte = 2
-	AtypIPv6       byte = 3
-)
-
-// DstAddr store destination address
-type DstAddr struct {
-	AddrType byte
-	Addr     []byte
-	Port     uint
-}
-
-// Client is vmess connection generator
-type Client struct {
-	user     []*ID
-	uuid     *uuid.UUID
-	security Security
-	tls      bool
-}
-
-// Config of vmess
-type Config struct {
-	UUID     string
-	AlterID  uint16
-	Security string
-	TLS      bool
-}
-
-// New return a Conn with net.Conn and DstAddr
-func (c *Client) New(conn net.Conn, dst *DstAddr) net.Conn {
-	r := rand.Intn(len(c.user))
-	if c.tls {
-		conn = tls.Client(conn, tlsConfig)
-	}
-	return newConn(conn, c.user[r], dst, c.security)
-}
-
-// NewClient return Client instance
-func NewClient(config Config) (*Client, error) {
-	uid, err := uuid.FromString(config.UUID)
-	if err != nil {
-		return nil, err
-	}
-
-	var security Security
-	switch config.Security {
-	case "aes-128-gcm":
-		security = SecurityAES128GCM
-	case "chacha20-poly1305":
-		security = SecurityCHACHA20POLY1305
-	case "none":
-		security = SecurityNone
-	case "auto":
-		security = SecurityCHACHA20POLY1305
-		if runtime.GOARCH == "amd64" || runtime.GOARCH == "s390x" || runtime.GOARCH == "arm64" {
-			security = SecurityAES128GCM
-		}
-	default:
-		return nil, fmt.Errorf("Unknown security type: %s", config.Security)
-	}
-	return &Client{
-		user:     newAlterIDs(newID(&uid), config.AlterID),
-		uuid:     &uid,
-		security: security,
-		tls:      config.TLS,
-	}, nil
-}

component/auth/auth.go

@@ -0,0 +1,46 @@
+package auth
+
+import (
+	"sync"
+)
+
+type Authenticator interface {
+	Verify(user string, pass string) bool
+	Users() []string
+}
+
+type AuthUser struct {
+	User string
+	Pass string
+}
+
+type inMemoryAuthenticator struct {
+	storage   *sync.Map
+	usernames []string
+}
+
+func (au *inMemoryAuthenticator) Verify(user string, pass string) bool {
+	realPass, ok := au.storage.Load(user)
+	return ok && realPass == pass
+}
+
+func (au *inMemoryAuthenticator) Users() []string { return au.usernames }
+
+func NewAuthenticator(users []AuthUser) Authenticator {
+	if len(users) == 0 {
+		return nil
+	}
+
+	au := &inMemoryAuthenticator{storage: &sync.Map{}}
+	for _, user := range users {
+		au.storage.Store(user.User, user.Pass)
+	}
+	usernames := make([]string, 0, len(users))
+	au.storage.Range(func(key, value interface{}) bool {
+		usernames = append(usernames, key.(string))
+		return true
+	})
+	au.usernames = usernames
+
+	return au
+}

component/domain-trie/node.go

@@ -0,0 +1,26 @@
+package trie
+
+// Node is the trie's node
+type Node struct {
+	Data     interface{}
+	children map[string]*Node
+}
+
+func (n *Node) getChild(s string) *Node {
+	return n.children[s]
+}
+
+func (n *Node) hasChild(s string) bool {
+	return n.getChild(s) != nil
+}
+
+func (n *Node) addChild(s string, child *Node) {
+	n.children[s] = child
+}
+
+func newNode(data interface{}) *Node {
+	return &Node{
+		Data:     data,
+		children: map[string]*Node{},
+	}
+}

component/domain-trie/tire.go

@@ -0,0 +1,92 @@
+package trie
+
+import (
+	"errors"
+	"strings"
+)
+
+const (
+	wildcard   = "*"
+	domainStep = "."
+)
+
+var (
+	// ErrInvalidDomain means insert domain is invalid
+	ErrInvalidDomain = errors.New("invalid domain")
+)
+
+// Trie contains the main logic for adding and searching nodes for domain segments.
+// support wildcard domain (e.g *.google.com)
+type Trie struct {
+	root *Node
+}
+
+func isValidDomain(domain string) bool {
+	return domain != "" && domain[0] != '.' && domain[len(domain)-1] != '.'
+}
+
+// Insert adds a node to the trie.
+// Support
+// 1. www.example.com
+// 2. *.example.com
+// 3. subdomain.*.example.com
+func (t *Trie) Insert(domain string, data interface{}) error {
+	if !isValidDomain(domain) {
+		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-- {
+		part := parts[i]
+		if !node.hasChild(part) {
+			node.addChild(part, newNode(nil))
+		}
+
+		node = node.getChild(part)
+	}
+
+	node.Data = data
+	return nil
+}
+
+// Search is the most important part of the Trie.
+// Priority as:
+// 1. static part
+// 2. wildcard domain
+func (t *Trie) Search(domain string) *Node {
+	if !isValidDomain(domain) {
+		return nil
+	}
+	parts := strings.Split(domain, domainStep)
+
+	n := t.root
+	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)
+		}
+
+		n = child
+	}
+
+	if n.Data == nil {
+		return nil
+	}
+
+	return n
+}
+
+// New returns a new, empty Trie.
+func New() *Trie {
+	return &Trie{root: newNode(nil)}
+}

component/domain-trie/trie_test.go

@@ -0,0 +1,87 @@
+package trie
+
+import (
+	"net"
+	"testing"
+)
+
+var localIP = net.IP{127, 0, 0, 1}
+
+func TestTrie_Basic(t *testing.T) {
+	tree := New()
+	domains := []string{
+		"example.com",
+		"google.com",
+	}
+
+	for _, domain := range domains {
+		tree.Insert(domain, localIP)
+	}
+
+	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")
+	}
+}
+
+func TestTrie_Wildcard(t *testing.T) {
+	tree := New()
+	domains := []string{
+		"*.example.com",
+		"sub.*.example.com",
+		"*.dev",
+	}
+
+	for _, domain := range domains {
+		tree.Insert(domain, localIP)
+	}
+
+	if tree.Search("sub.example.com") == nil {
+		t.Error("should not recv nil")
+	}
+
+	if tree.Search("sub.foo.example.com") == nil {
+		t.Error("should not recv nil")
+	}
+
+	if tree.Search("foo.sub.example.com") != nil {
+		t.Error("should recv nil")
+	}
+
+	if tree.Search("foo.example.dev") != nil {
+		t.Error("should recv nil")
+	}
+
+	if tree.Search("example.com") != nil {
+		t.Error("should recv nil")
+	}
+}
+
+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")
+	}
+}

component/fakeip/pool.go

@@ -0,0 +1,141 @@
+package fakeip
+
+import (
+	"errors"
+	"net"
+	"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
+type Pool struct {
+	max     uint32
+	min     uint32
+	gateway uint32
+	offset  uint32
+	mux     sync.Mutex
+	host    *trie.Trie
+	cache   *cache.LruCache
+}
+
+// Lookup return a fake ip with host
+func (p *Pool) Lookup(host string) net.IP {
+	p.mux.Lock()
+	defer p.mux.Unlock()
+	if elm, exist := p.cache.Get(host); exist {
+		ip := elm.(net.IP)
+
+		// ensure ip --> host on head of linked list
+		n := ipToUint(ip.To4())
+		offset := n - p.min + 1
+		p.cache.Get(offset)
+		return ip
+	}
+
+	ip := p.get(host)
+	p.cache.Set(host, ip)
+	return ip
+}
+
+// LookBack return host with the fake ip
+func (p *Pool) LookBack(ip net.IP) (string, 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
+
+	if elm, exist := p.cache.Get(offset); exist {
+		host := elm.(string)
+
+		// ensure host --> ip on head of linked list
+		p.cache.Get(host)
+		return host, true
+	}
+
+	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)
+}
+
+func (p *Pool) get(host string) net.IP {
+	current := p.offset
+	for {
+		p.offset = (p.offset + 1) % (p.max - p.min)
+		// Avoid infinite loops
+		if p.offset == current {
+			break
+		}
+
+		if !p.cache.Exist(p.offset) {
+			break
+		}
+	}
+	ip := uintToIP(p.min + p.offset - 1)
+	p.cache.Set(p.offset, host)
+	return ip
+}
+
+func ipToUint(ip net.IP) uint32 {
+	v := uint32(ip[0]) << 24
+	v += uint32(ip[1]) << 16
+	v += uint32(ip[2]) << 8
+	v += uint32(ip[3])
+	return v
+}
+
+func uintToIP(v uint32) net.IP {
+	return net.IPv4(byte(v>>24), byte(v>>16), byte(v>>8), byte(v))
+}
+
+// New return Pool instance
+func New(ipnet *net.IPNet, size int, host *trie.Trie) (*Pool, error) {
+	min := ipToUint(ipnet.IP) + 2
+
+	ones, bits := ipnet.Mask.Size()
+	total := 1<<uint(bits-ones) - 2
+
+	if total <= 0 {
+		return nil, errors.New("ipnet don't have valid ip")
+	}
+
+	max := min + uint32(total) - 1
+	return &Pool{
+		min:     min,
+		max:     max,
+		gateway: min - 1,
+		host:    host,
+		cache:   cache.NewLRUCache(cache.WithSize(size * 2)),
+	}, nil
+}

component/fakeip/pool_test.go

@@ -0,0 +1,78 @@
+package fakeip
+
+import (
+	"net"
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestPool_Basic(t *testing.T) {
+	_, ipnet, _ := net.ParseCIDR("192.168.0.1/29")
+	pool, _ := New(ipnet, 10, nil)
+
+	first := pool.Lookup("foo.com")
+	last := pool.Lookup("bar.com")
+	bar, exist := pool.LookBack(last)
+
+	assert.True(t, first.Equal(net.IP{192, 168, 0, 2}))
+	assert.True(t, last.Equal(net.IP{192, 168, 0, 3}))
+	assert.True(t, exist)
+	assert.Equal(t, bar, "bar.com")
+}
+
+func TestPool_Cycle(t *testing.T) {
+	_, ipnet, _ := net.ParseCIDR("192.168.0.1/30")
+	pool, _ := New(ipnet, 10, nil)
+
+	first := pool.Lookup("foo.com")
+	same := pool.Lookup("baz.com")
+
+	assert.True(t, first.Equal(same))
+}
+
+func TestPool_MaxCacheSize(t *testing.T) {
+	_, ipnet, _ := net.ParseCIDR("192.168.0.1/24")
+	pool, _ := New(ipnet, 2, nil)
+
+	first := pool.Lookup("foo.com")
+	pool.Lookup("bar.com")
+	pool.Lookup("baz.com")
+	next := pool.Lookup("foo.com")
+
+	assert.False(t, first.Equal(next))
+}
+
+func TestPool_DoubleMapping(t *testing.T) {
+	_, ipnet, _ := net.ParseCIDR("192.168.0.1/24")
+	pool, _ := New(ipnet, 2, nil)
+
+	// fill cache
+	fooIP := pool.Lookup("foo.com")
+	bazIP := pool.Lookup("baz.com")
+
+	// make foo.com hot
+	pool.Lookup("foo.com")
+
+	// should drop baz.com
+	barIP := pool.Lookup("bar.com")
+
+	_, fooExist := pool.LookBack(fooIP)
+	_, bazExist := pool.LookBack(bazIP)
+	_, barExist := pool.LookBack(barIP)
+
+	newBazIP := pool.Lookup("baz.com")
+
+	assert.True(t, fooExist)
+	assert.False(t, bazExist)
+	assert.True(t, barExist)
+
+	assert.False(t, bazIP.Equal(newBazIP))
+}
+
+func TestPool_Error(t *testing.T) {
+	_, ipnet, _ := net.ParseCIDR("192.168.0.1/31")
+	_, err := New(ipnet, 10, nil)
+
+	assert.Error(t, err)
+}

component/nat/table.go

@@ -0,0 +1,46 @@
+package nat
+
+import (
+	"net"
+	"sync"
+)
+
+type Table struct {
+	mapping sync.Map
+}
+
+type element struct {
+	RemoteAddr net.Addr
+	RemoteConn net.PacketConn
+}
+
+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) {
+	item, exist := t.mapping.Load(key)
+	if !exist {
+		return nil, nil
+	}
+	elm := item.(*element)
+	return elm.RemoteConn, elm.RemoteAddr
+}
+
+func (t *Table) GetOrCreateLock(key string) (*sync.WaitGroup, bool) {
+	item, loaded := t.mapping.LoadOrStore(key, &sync.WaitGroup{})
+	return item.(*sync.WaitGroup), loaded
+}
+
+func (t *Table) Delete(key string) {
+	t.mapping.Delete(key)
+}
+
+// New return *Cache
+func New() *Table {
+	return &Table{}
+}

component/simple-obfs/http.go

@@ -8,6 +8,8 @@ import (
 	"math/rand"
 	"net"
 	"net/http"
+
+	"github.com/Dreamacro/clash/common/pool"
 )
 
 // HTTPObfs is shadowsocks http simple-obfs implementation
@@ -32,15 +34,15 @@ func (ho *HTTPObfs) Read(b []byte) (int, error) {
 	}
 
 	if ho.firstResponse {
-		buf := bufPool.Get().([]byte)
+		buf := pool.BufPool.Get().([]byte)
 		n, err := ho.Conn.Read(buf)
 		if err != nil {
-			bufPool.Put(buf[:cap(buf)])
+			pool.BufPool.Put(buf[:cap(buf)])
 			return 0, err
 		}
 		idx := bytes.Index(buf[:n], []byte("\r\n\r\n"))
 		if idx == -1 {
-			bufPool.Put(buf[:cap(buf)])
+			pool.BufPool.Put(buf[:cap(buf)])
 			return 0, io.EOF
 		}
 		ho.firstResponse = false
@@ -50,7 +52,7 @@ func (ho *HTTPObfs) Read(b []byte) (int, error) {
 			ho.buf = buf[:idx+4+length]
 			ho.offset = idx + 4 + n
 		} else {
-			bufPool.Put(buf[:cap(buf)])
+			pool.BufPool.Put(buf[:cap(buf)])
 		}
 		return n, nil
 	}

component/simple-obfs/tls.go

@@ -6,15 +6,18 @@ import (
 	"io"
 	"math/rand"
 	"net"
-	"sync"
 	"time"
+
+	"github.com/Dreamacro/clash/common/pool"
 )
 
 func init() {
 	rand.Seed(time.Now().Unix())
 }
 
-var bufPool = sync.Pool{New: func() interface{} { return make([]byte, 2048) }}
+const (
+	chunkSize = 1 << 14 // 2 ** 14 == 16 * 1024
+)
 
 // TLSObfs is shadowsocks tls simple-obfs implementation
 type TLSObfs struct {
@@ -26,12 +29,12 @@ type TLSObfs struct {
 }
 
 func (to *TLSObfs) read(b []byte, discardN int) (int, error) {
-	buf := bufPool.Get().([]byte)
+	buf := pool.BufPool.Get().([]byte)
 	_, err := io.ReadFull(to.Conn, buf[:discardN])
 	if err != nil {
 		return 0, err
 	}
-	bufPool.Put(buf[:cap(buf)])
+	pool.BufPool.Put(buf[:cap(buf)])
 
 	sizeBuf := make([]byte, 2)
 	_, err = io.ReadFull(to.Conn, sizeBuf)
@@ -75,8 +78,23 @@ func (to *TLSObfs) Read(b []byte) (int, error) {
 	// type + ver = 3
 	return to.read(b, 3)
 }
-
 func (to *TLSObfs) Write(b []byte) (int, error) {
+	length := len(b)
+	for i := 0; i < length; i += chunkSize {
+		end := i + chunkSize
+		if end > length {
+			end = length
+		}
+
+		n, err := to.write(b[i:end])
+		if err != nil {
+			return n, err
+		}
+	}
+	return length, nil
+}
+
+func (to *TLSObfs) write(b []byte) (int, error) {
 	if to.firstRequest {
 		helloMsg := makeClientHelloMsg(b, to.server)
 		_, err := to.Conn.Write(helloMsg)
@@ -84,7 +102,7 @@ func (to *TLSObfs) Write(b []byte) (int, error) {
 		return len(b), err
 	}
 
-	size := bufPool.Get().([]byte)
+	size := pool.BufPool.Get().([]byte)
 	binary.BigEndian.PutUint16(size[:2], uint16(len(b)))
 
 	buf := &bytes.Buffer{}
@@ -92,7 +110,7 @@ func (to *TLSObfs) Write(b []byte) (int, error) {
 	buf.Write(size[:2])
 	buf.Write(b)
 	_, err := to.Conn.Write(buf.Bytes())
-	bufPool.Put(size[:cap(size)])
+	pool.BufPool.Put(size[:cap(size)])
 	return len(b), err
 }
 
@@ -107,9 +125,8 @@ func NewTLSObfs(conn net.Conn, server string) net.Conn {
 }
 
 func makeClientHelloMsg(data []byte, server string) []byte {
-	random := make([]byte, 32)
+	random := make([]byte, 28)
 	sessionID := make([]byte, 32)
-	size := make([]byte, 2)
 	rand.Read(random)
 	rand.Read(sessionID)
 
@@ -124,12 +141,12 @@ func makeClientHelloMsg(data []byte, server string) []byte {
 
 	// clientHello, length, TLS 1.2 version
 	buf.WriteByte(1)
-	binary.BigEndian.PutUint16(size, uint16(208+len(data)+len(server)))
 	buf.WriteByte(0)
-	buf.Write(size)
+	binary.Write(buf, binary.BigEndian, uint16(208+len(data)+len(server)))
 	buf.Write([]byte{0x03, 0x03})
 
-	// random, sid len, sid
+	// random with timestamp, sid len, sid
+	binary.Write(buf, binary.BigEndian, uint32(time.Now().Unix()))
 	buf.Write(random)
 	buf.WriteByte(32)
 	buf.Write(sessionID)
@@ -147,24 +164,19 @@ func makeClientHelloMsg(data []byte, server string) []byte {
 	buf.Write([]byte{0x01, 0x00})
 
 	// extension length
-	binary.BigEndian.PutUint16(size, uint16(79+len(data)+len(server)))
-	buf.Write(size)
+	binary.Write(buf, binary.BigEndian, uint16(79+len(data)+len(server)))
 
 	// session ticket
 	buf.Write([]byte{0x00, 0x23})
-	binary.BigEndian.PutUint16(size, uint16(len(data)))
-	buf.Write(size)
+	binary.Write(buf, binary.BigEndian, uint16(len(data)))
 	buf.Write(data)
 
 	// server name
 	buf.Write([]byte{0x00, 0x00})
-	binary.BigEndian.PutUint16(size, uint16(len(server)+5))
-	buf.Write(size)
-	binary.BigEndian.PutUint16(size, uint16(len(server)+3))
-	buf.Write(size)
+	binary.Write(buf, binary.BigEndian, uint16(len(server)+5))
+	binary.Write(buf, binary.BigEndian, uint16(len(server)+3))
 	buf.WriteByte(0)
-	binary.BigEndian.PutUint16(size, uint16(len(server)))
-	buf.Write(size)
+	binary.Write(buf, binary.BigEndian, uint16(len(server)))
 	buf.Write([]byte(server))
 
 	// ec_point

component/snell/cipher.go

@@ -0,0 +1,21 @@
+package snell
+
+import (
+	"crypto/cipher"
+
+	"golang.org/x/crypto/argon2"
+)
+
+type snellCipher struct {
+	psk      []byte
+	makeAEAD func(key []byte) (cipher.AEAD, error)
+}
+
+func (sc *snellCipher) KeySize() int  { return 32 }
+func (sc *snellCipher) SaltSize() int { return 16 }
+func (sc *snellCipher) Encrypter(salt []byte) (cipher.AEAD, error) {
+	return sc.makeAEAD(argon2.IDKey(sc.psk, salt, 3, 8, 1, uint32(sc.KeySize())))
+}
+func (sc *snellCipher) Decrypter(salt []byte) (cipher.AEAD, error) {
+	return sc.makeAEAD(argon2.IDKey(sc.psk, salt, 3, 8, 1, uint32(sc.KeySize())))
+}

component/snell/snell.go

@@ -0,0 +1,91 @@
+package snell
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"io"
+	"net"
+	"sync"
+
+	"github.com/Dreamacro/go-shadowsocks2/shadowaead"
+	"golang.org/x/crypto/chacha20poly1305"
+)
+
+const (
+	CommandPing    byte = 0
+	CommandConnect byte = 1
+
+	CommandTunnel byte = 0
+	CommandError  byte = 2
+
+	Version byte = 1
+)
+
+var (
+	bufferPool = sync.Pool{New: func() interface{} { return &bytes.Buffer{} }}
+)
+
+type Snell struct {
+	net.Conn
+	buffer [1]byte
+	reply  bool
+}
+
+func (s *Snell) Read(b []byte) (int, error) {
+	if s.reply {
+		return s.Conn.Read(b)
+	}
+
+	s.reply = true
+	if _, err := io.ReadFull(s.Conn, s.buffer[:]); err != nil {
+		return 0, err
+	}
+
+	if s.buffer[0] == CommandTunnel {
+		return s.Conn.Read(b)
+	} else if s.buffer[0] != CommandError {
+		return 0, errors.New("Command not support")
+	}
+
+	// CommandError
+	if _, err := io.ReadFull(s.Conn, s.buffer[:]); err != nil {
+		return 0, err
+	}
+
+	length := int(s.buffer[0])
+	msg := make([]byte, length)
+
+	if _, err := io.ReadFull(s.Conn, msg); err != nil {
+		return 0, err
+	}
+
+	return 0, errors.New(string(msg))
+}
+
+func WriteHeader(conn net.Conn, host string, port uint) error {
+	buf := bufferPool.Get().(*bytes.Buffer)
+	buf.Reset()
+	defer bufferPool.Put(buf)
+	buf.WriteByte(Version)
+	buf.WriteByte(CommandConnect)
+
+	// clientID length & id
+	buf.WriteByte(0)
+
+	// host & port
+	buf.WriteByte(uint8(len(host)))
+	buf.WriteString(host)
+	binary.Write(buf, binary.BigEndian, uint16(port))
+
+	if _, err := conn.Write(buf.Bytes()); err != nil {
+		return err
+	}
+
+	return nil
+}
+
+func StreamConn(conn net.Conn, psk []byte) net.Conn {
+	cipher := &snellCipher{psk, chacha20poly1305.New}
+	return &Snell{Conn: shadowaead.NewConn(conn, cipher)}
+}

component/socks5/socks5.go

@@ -0,0 +1,429 @@
+package socks5
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"io"
+	"net"
+	"strconv"
+
+	"github.com/Dreamacro/clash/component/auth"
+)
+
+// Error represents a SOCKS error
+type Error byte
+
+func (err Error) Error() string {
+	return "SOCKS error: " + strconv.Itoa(int(err))
+}
+
+// Command is request commands as defined in RFC 1928 section 4.
+type Command = uint8
+
+// SOCKS request commands as defined in RFC 1928 section 4.
+const (
+	CmdConnect      Command = 1
+	CmdBind         Command = 2
+	CmdUDPAssociate Command = 3
+)
+
+// SOCKS address types as defined in RFC 1928 section 5.
+const (
+	AtypIPv4       = 1
+	AtypDomainName = 3
+	AtypIPv6       = 4
+)
+
+// MaxAddrLen is the maximum size of SOCKS address in bytes.
+const MaxAddrLen = 1 + 1 + 255 + 2
+
+// MaxAuthLen is the maximum size of user/password field in SOCKS5 Auth
+const MaxAuthLen = 255
+
+// Addr represents a SOCKS address as defined in RFC 1928 section 5.
+type Addr []byte
+
+func (a Addr) String() string {
+	var host, port string
+
+	switch a[0] {
+	case AtypDomainName:
+		hostLen := uint16(a[1])
+		host = string(a[2 : 2+hostLen])
+		port = strconv.Itoa((int(a[2+hostLen]) << 8) | int(a[2+hostLen+1]))
+	case AtypIPv4:
+		host = net.IP(a[1 : 1+net.IPv4len]).String()
+		port = strconv.Itoa((int(a[1+net.IPv4len]) << 8) | int(a[1+net.IPv4len+1]))
+	case AtypIPv6:
+		host = net.IP(a[1 : 1+net.IPv6len]).String()
+		port = strconv.Itoa((int(a[1+net.IPv6len]) << 8) | int(a[1+net.IPv6len+1]))
+	}
+
+	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)
+	ErrConnectionNotAllowed = Error(2)
+	ErrNetworkUnreachable   = Error(3)
+	ErrHostUnreachable      = Error(4)
+	ErrConnectionRefused    = Error(5)
+	ErrTTLExpired           = Error(6)
+	ErrCommandNotSupported  = Error(7)
+	ErrAddressNotSupported  = Error(8)
+)
+
+// Auth errors used to return a specific "Auth failed" error
+var ErrAuth = errors.New("auth failed")
+
+type User struct {
+	Username string
+	Password string
+}
+
+// ServerHandshake fast-tracks SOCKS initialization to get target address to connect on server side.
+func ServerHandshake(rw net.Conn, authenticator auth.Authenticator) (addr Addr, command Command, err error) {
+	// Read RFC 1928 for request and reply structure and sizes.
+	buf := make([]byte, MaxAddrLen)
+	// read VER, NMETHODS, METHODS
+	if _, err = io.ReadFull(rw, buf[:2]); err != nil {
+		return
+	}
+	nmethods := buf[1]
+	if _, err = io.ReadFull(rw, buf[:nmethods]); err != nil {
+		return
+	}
+
+	// write VER METHOD
+	if authenticator != nil {
+		if _, err = rw.Write([]byte{5, 2}); err != nil {
+			return
+		}
+
+		// Get header
+		header := make([]byte, 2)
+		if _, err = io.ReadFull(rw, header); err != nil {
+			return
+		}
+
+		authBuf := make([]byte, MaxAuthLen)
+		// Get username
+		userLen := int(header[1])
+		if userLen <= 0 {
+			rw.Write([]byte{1, 1})
+			err = ErrAuth
+			return
+		}
+		if _, err = io.ReadFull(rw, authBuf[:userLen]); err != nil {
+			return
+		}
+		user := string(authBuf[:userLen])
+
+		// Get password
+		if _, err = rw.Read(header[:1]); err != nil {
+			return
+		}
+		passLen := int(header[0])
+		if passLen <= 0 {
+			rw.Write([]byte{1, 1})
+			err = ErrAuth
+			return
+		}
+		if _, err = io.ReadFull(rw, authBuf[:passLen]); err != nil {
+			return
+		}
+		pass := string(authBuf[:passLen])
+
+		// Verify
+		if ok := authenticator.Verify(string(user), string(pass)); !ok {
+			rw.Write([]byte{1, 1})
+			err = ErrAuth
+			return
+		}
+
+		// Response auth state
+		if _, err = rw.Write([]byte{1, 0}); err != nil {
+			return
+		}
+	} else {
+		if _, err = rw.Write([]byte{5, 0}); err != nil {
+			return
+		}
+	}
+
+	// read VER CMD RSV ATYP DST.ADDR DST.PORT
+	if _, err = io.ReadFull(rw, buf[:3]); err != nil {
+		return
+	}
+
+	command = buf[1]
+	addr, err = readAddr(rw, buf)
+	if err != nil {
+		return
+	}
+
+	switch command {
+	case CmdConnect, CmdUDPAssociate:
+		// Acquire server listened address info
+		localAddr := ParseAddr(rw.LocalAddr().String())
+		if localAddr == nil {
+			err = ErrAddressNotSupported
+		} else {
+			// write VER REP RSV ATYP BND.ADDR BND.PORT
+			_, err = rw.Write(bytes.Join([][]byte{{5, 0, 0}, localAddr}, []byte{}))
+		}
+	case CmdBind:
+		fallthrough
+	default:
+		err = ErrCommandNotSupported
+	}
+
+	return
+}
+
+// ClientHandshake fast-tracks SOCKS initialization to get target address to connect on client side.
+func ClientHandshake(rw io.ReadWriter, addr Addr, command Command, user *User) (Addr, error) {
+	buf := make([]byte, MaxAddrLen)
+	var err error
+
+	// VER, NMETHODS, METHODS
+	if user != nil {
+		_, err = rw.Write([]byte{5, 1, 2})
+	} else {
+		_, err = rw.Write([]byte{5, 1, 0})
+	}
+	if err != nil {
+		return nil, err
+	}
+
+	// VER, METHOD
+	if _, err := io.ReadFull(rw, buf[:2]); err != nil {
+		return nil, err
+	}
+
+	if buf[0] != 5 {
+		return nil, errors.New("SOCKS version error")
+	}
+
+	if buf[1] == 2 {
+		// password protocol version
+		authMsg := &bytes.Buffer{}
+		authMsg.WriteByte(1)
+		authMsg.WriteByte(uint8(len(user.Username)))
+		authMsg.WriteString(user.Username)
+		authMsg.WriteByte(uint8(len(user.Password)))
+		authMsg.WriteString(user.Password)
+
+		if _, err := rw.Write(authMsg.Bytes()); err != nil {
+			return nil, err
+		}
+
+		if _, err := io.ReadFull(rw, buf[:2]); err != nil {
+			return nil, err
+		}
+
+		if buf[1] != 0 {
+			return nil, errors.New("rejected username/password")
+		}
+	} else if buf[1] != 0 {
+		return nil, errors.New("SOCKS need auth")
+	}
+
+	// VER, CMD, RSV, ADDR
+	if _, err := rw.Write(bytes.Join([][]byte{{5, command, 0}, addr}, []byte{})); err != nil {
+		return nil, err
+	}
+
+	// VER, REP, RSV
+	if _, err := io.ReadFull(rw, buf[:3]); err != nil {
+		return nil, err
+	}
+
+	return readAddr(rw, buf)
+}
+
+func readAddr(r io.Reader, b []byte) (Addr, error) {
+	if len(b) < MaxAddrLen {
+		return nil, io.ErrShortBuffer
+	}
+	_, err := io.ReadFull(r, b[:1]) // read 1st byte for address type
+	if err != nil {
+		return nil, err
+	}
+
+	switch b[0] {
+	case AtypDomainName:
+		_, err = io.ReadFull(r, b[1:2]) // read 2nd byte for domain length
+		if err != nil {
+			return nil, err
+		}
+		domainLength := uint16(b[1])
+		_, err = io.ReadFull(r, b[2:2+domainLength+2])
+		return b[:1+1+domainLength+2], err
+	case AtypIPv4:
+		_, err = io.ReadFull(r, b[1:1+net.IPv4len+2])
+		return b[:1+net.IPv4len+2], err
+	case AtypIPv6:
+		_, err = io.ReadFull(r, b[1:1+net.IPv6len+2])
+		return b[:1+net.IPv6len+2], err
+	}
+
+	return nil, ErrAddressNotSupported
+}
+
+// SplitAddr slices a SOCKS address from beginning of b. Returns nil if failed.
+func SplitAddr(b []byte) Addr {
+	addrLen := 1
+	if len(b) < addrLen {
+		return nil
+	}
+
+	switch b[0] {
+	case AtypDomainName:
+		if len(b) < 2 {
+			return nil
+		}
+		addrLen = 1 + 1 + int(b[1]) + 2
+	case AtypIPv4:
+		addrLen = 1 + net.IPv4len + 2
+	case AtypIPv6:
+		addrLen = 1 + net.IPv6len + 2
+	default:
+		return nil
+
+	}
+
+	if len(b) < addrLen {
+		return nil
+	}
+
+	return b[:addrLen]
+}
+
+// ParseAddr parses the address in string s. Returns nil if failed.
+func ParseAddr(s string) Addr {
+	var addr Addr
+	host, port, err := net.SplitHostPort(s)
+	if err != nil {
+		return nil
+	}
+	if ip := net.ParseIP(host); ip != nil {
+		if ip4 := ip.To4(); ip4 != nil {
+			addr = make([]byte, 1+net.IPv4len+2)
+			addr[0] = AtypIPv4
+			copy(addr[1:], ip4)
+		} else {
+			addr = make([]byte, 1+net.IPv6len+2)
+			addr[0] = AtypIPv6
+			copy(addr[1:], ip)
+		}
+	} else {
+		if len(host) > 255 {
+			return nil
+		}
+		addr = make([]byte, 1+1+len(host)+2)
+		addr[0] = AtypDomainName
+		addr[1] = byte(len(host))
+		copy(addr[2:], host)
+	}
+
+	portnum, err := strconv.ParseUint(port, 10, 16)
+	if err != nil {
+		return nil
+	}
+
+	addr[len(addr)-2], addr[len(addr)-1] = byte(portnum>>8), byte(portnum)
+
+	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 {
+		err = errors.New("insufficient length of packet")
+		return
+	}
+
+	// packet[0] and packet[1] are reserved
+	if !bytes.Equal(packet[:2], []byte{0, 0}) {
+		err = errors.New("reserved fields should be zero")
+		return
+	}
+
+	if packet[2] != 0 /* fragments */ {
+		err = errors.New("discarding fragmented payload")
+		return
+	}
+
+	addr = SplitAddr(packet[3:])
+	if addr == nil {
+		err = errors.New("failed to read UDP header")
+	}
+
+	payload = packet[3+len(addr):]
+	return
+}
+
+func EncodeUDPPacket(addr Addr, payload []byte) (packet []byte, err error) {
+	if addr == nil {
+		err = errors.New("address is invalid")
+		return
+	}
+	packet = bytes.Join([][]byte{{0, 0, 0}, addr, payload}, []byte{})
+	return
+}

component/v2ray-plugin/mux.go

@@ -0,0 +1,173 @@
+package obfs
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"io"
+	"net"
+)
+
+type SessionStatus = byte
+
+const (
+	SessionStatusNew       SessionStatus = 0x01
+	SessionStatusKeep      SessionStatus = 0x02
+	SessionStatusEnd       SessionStatus = 0x03
+	SessionStatusKeepAlive SessionStatus = 0x04
+)
+
+const (
+	OptionNone  = byte(0x00)
+	OptionData  = byte(0x01)
+	OptionError = byte(0x02)
+)
+
+type MuxOption struct {
+	ID   [2]byte
+	Port uint16
+	Host string
+	Type string
+}
+
+// Mux is an mux-compatible client for v2ray-plugin, not a complete implementation
+type Mux struct {
+	net.Conn
+	buf    bytes.Buffer
+	id     [2]byte
+	length [2]byte
+	status [2]byte
+	otb    []byte
+	remain int
+}
+
+func (m *Mux) Read(b []byte) (int, error) {
+	if m.remain != 0 {
+		length := m.remain
+		if len(b) < m.remain {
+			length = len(b)
+		}
+
+		n, err := m.Conn.Read(b[:length])
+		if err != nil {
+			return 0, err
+		}
+		m.remain -= n
+		return n, nil
+	}
+
+	for {
+		_, err := io.ReadFull(m.Conn, m.length[:])
+		if err != nil {
+			return 0, err
+		}
+		length := binary.BigEndian.Uint16(m.length[:])
+		if length > 512 {
+			return 0, errors.New("invalid metalen")
+		}
+
+		_, err = io.ReadFull(m.Conn, m.id[:])
+		if err != nil {
+			return 0, err
+		}
+
+		_, err = m.Conn.Read(m.status[:])
+		if err != nil {
+			return 0, err
+		}
+
+		opcode := m.status[0]
+		if opcode == SessionStatusKeepAlive {
+			continue
+		}
+
+		opts := m.status[1]
+
+		if opts != OptionData {
+			continue
+		}
+
+		_, err = io.ReadFull(m.Conn, m.length[:])
+		if err != nil {
+			return 0, err
+		}
+		dataLen := int(binary.BigEndian.Uint16(m.length[:]))
+		m.remain = dataLen
+		if dataLen > len(b) {
+			dataLen = len(b)
+		}
+
+		n, err := m.Conn.Read(b[:dataLen])
+		m.remain -= n
+		return n, err
+	}
+}
+
+func (m *Mux) Write(b []byte) (int, error) {
+	if m.otb != nil {
+		// create a sub connection
+		if _, err := m.Conn.Write(m.otb); err != nil {
+			return 0, err
+		}
+		m.otb = nil
+	}
+	m.buf.Reset()
+	binary.Write(&m.buf, binary.BigEndian, uint16(4))
+	m.buf.Write(m.id[:])
+	m.buf.WriteByte(SessionStatusKeep)
+	m.buf.WriteByte(OptionData)
+	binary.Write(&m.buf, binary.BigEndian, uint16(len(b)))
+	m.buf.Write(b)
+
+	return m.Conn.Write(m.buf.Bytes())
+}
+
+func (m *Mux) Close() error {
+	_, err := m.Conn.Write([]byte{0x0, 0x4, m.id[0], m.id[1], SessionStatusEnd, OptionNone})
+	if err != nil {
+		return err
+	}
+	return m.Conn.Close()
+}
+
+func NewMux(conn net.Conn, option MuxOption) *Mux {
+	buf := &bytes.Buffer{}
+
+	// fill empty length
+	buf.Write([]byte{0x0, 0x0})
+	buf.Write(option.ID[:])
+	buf.WriteByte(SessionStatusNew)
+	buf.WriteByte(OptionNone)
+
+	// tcp
+	netType := byte(0x1)
+	if option.Type == "udp" {
+		netType = byte(0x2)
+	}
+	buf.WriteByte(netType)
+
+	// port
+	binary.Write(buf, binary.BigEndian, option.Port)
+
+	// address
+	ip := net.ParseIP(option.Host)
+	if ip == nil {
+		buf.WriteByte(0x2)
+		buf.WriteString(option.Host)
+	} else if ipv4 := ip.To4(); ipv4 != nil {
+		buf.WriteByte(0x1)
+		buf.Write(ipv4)
+	} else {
+		buf.WriteByte(0x3)
+		buf.Write(ip.To16())
+	}
+
+	metadata := buf.Bytes()
+	binary.BigEndian.PutUint16(metadata[:2], uint16(len(metadata)-2))
+
+	return &Mux{
+		Conn: conn,
+		id:   option.ID,
+		otb:  metadata,
+	}
+}

component/v2ray-plugin/websocket.go

@@ -0,0 +1,49 @@
+package obfs
+
+import (
+	"crypto/tls"
+	"net"
+	"net/http"
+
+	"github.com/Dreamacro/clash/component/vmess"
+)
+
+// Option is options of websocket obfs
+type Option struct {
+	Host      string
+	Path      string
+	Headers   map[string]string
+	TLSConfig *tls.Config
+	Mux       bool
+}
+
+// NewV2rayObfs return a HTTPObfs
+func NewV2rayObfs(conn net.Conn, option *Option) (net.Conn, error) {
+	header := http.Header{}
+	for k, v := range option.Headers {
+		header.Add(k, v)
+	}
+
+	config := &vmess.WebsocketConfig{
+		Host:      option.Host,
+		Path:      option.Path,
+		TLS:       option.TLSConfig != nil,
+		Headers:   header,
+		TLSConfig: option.TLSConfig,
+	}
+
+	var err error
+	conn, err = vmess.NewWebsocketConn(conn, config)
+	if err != nil {
+		return nil, err
+	}
+
+	if option.Mux {
+		conn = NewMux(conn, MuxOption{
+			ID:   [2]byte{0, 0},
+			Host: "127.0.0.1",
+			Port: 0,
+		})
+	}
+	return conn, nil
+}

component/vmess/aead.go

@@ -5,6 +5,8 @@ import (
 	"encoding/binary"
 	"errors"
 	"io"
+
+	"github.com/Dreamacro/clash/common/pool"
 )
 
 type aeadWriter struct {
@@ -20,8 +22,8 @@ func newAEADWriter(w io.Writer, aead cipher.AEAD, iv []byte) *aeadWriter {
 }
 
 func (w *aeadWriter) Write(b []byte) (n int, err error) {
-	buf := bufPool.Get().([]byte)
-	defer bufPool.Put(buf[:cap(buf)])
+	buf := pool.BufPool.Get().([]byte)
+	defer pool.BufPool.Put(buf[:cap(buf)])
 	length := len(b)
 	for {
 		if length == 0 {
@@ -71,7 +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) {
-			bufPool.Put(r.buf[:cap(r.buf)])
+			pool.BufPool.Put(r.buf[:cap(r.buf)])
 			r.buf = nil
 		}
 		return n, nil
@@ -87,10 +89,10 @@ func (r *aeadReader) Read(b []byte) (int, error) {
 		return 0, errors.New("Buffer is larger than standard")
 	}
 
-	buf := bufPool.Get().([]byte)
+	buf := pool.BufPool.Get().([]byte)
 	_, err = io.ReadFull(r.Reader, buf[:size])
 	if err != nil {
-		bufPool.Put(buf[:cap(buf)])
+		pool.BufPool.Put(buf[:cap(buf)])
 		return 0, err
 	}
 
@@ -105,7 +107,7 @@ func (r *aeadReader) Read(b []byte) (int, error) {
 	realLen := size - r.Overhead()
 	n := copy(b, buf[:realLen])
 	if len(b) >= realLen {
-		bufPool.Put(buf[:cap(buf)])
+		pool.BufPool.Put(buf[:cap(buf)])
 		return n, nil
 	}
 

component/vmess/chunk.go

@@ -4,7 +4,8 @@ import (
 	"encoding/binary"
 	"errors"
 	"io"
-	"sync"
+
+	"github.com/Dreamacro/clash/common/pool"
 )
 
 const (
@@ -13,8 +14,6 @@ const (
 	maxSize   = 17 * 1024 // 2 + chunkSize + aead.Overhead()
 )
 
-var bufPool = sync.Pool{New: func() interface{} { return make([]byte, maxSize) }}
-
 type chunkReader struct {
 	io.Reader
 	buf     []byte
@@ -35,7 +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) {
-			bufPool.Put(cr.buf[:cap(cr.buf)])
+			pool.BufPool.Put(cr.buf[:cap(cr.buf)])
 			cr.buf = nil
 		}
 		return n, nil
@@ -60,10 +59,10 @@ func (cr *chunkReader) Read(b []byte) (int, error) {
 		return size, nil
 	}
 
-	buf := bufPool.Get().([]byte)
+	buf := pool.BufPool.Get().([]byte)
 	_, err = io.ReadFull(cr.Reader, buf[:size])
 	if err != nil {
-		bufPool.Put(buf[:cap(buf)])
+		pool.BufPool.Put(buf[:cap(buf)])
 		return 0, err
 	}
 	n := copy(b, cr.buf[:])
@@ -77,8 +76,8 @@ type chunkWriter struct {
 }
 
 func (cw *chunkWriter) Write(b []byte) (n int, err error) {
-	buf := bufPool.Get().([]byte)
-	defer bufPool.Put(buf[:cap(buf)])
+	buf := pool.BufPool.Get().([]byte)
+	defer pool.BufPool.Put(buf[:cap(buf)])
 	length := len(b)
 	for {
 		if length == 0 {

component/vmess/conn.go

@@ -35,20 +35,10 @@ type Conn struct {
 	respV       byte
 	security    byte
 
-	sent     bool
 	received bool
 }
 
 func (vc *Conn) Write(b []byte) (int, error) {
-	if vc.sent {
-		return vc.writer.Write(b)
-	}
-
-	if err := vc.sendRequest(); err != nil {
-		return 0, err
-	}
-
-	vc.sent = true
 	return vc.writer.Write(b)
 }
 
@@ -65,11 +55,10 @@ func (vc *Conn) Read(b []byte) (int, error) {
 }
 
 func (vc *Conn) sendRequest() error {
-	timestamp := make([]byte, 8)
-	binary.BigEndian.PutUint64(timestamp, uint64(time.Now().UTC().Unix()))
+	timestamp := time.Now()
 
 	h := hmac.New(md5.New, vc.id.UUID.Bytes())
-	h.Write(timestamp)
+	binary.Write(h, binary.BigEndian, uint64(timestamp.Unix()))
 	_, err := vc.Conn.Write(h.Sum(nil))
 	if err != nil {
 		return err
@@ -88,7 +77,11 @@ func (vc *Conn) sendRequest() error {
 	// P Sec Reserve Cmd
 	buf.WriteByte(byte(p<<4) | byte(vc.security))
 	buf.WriteByte(0)
-	buf.WriteByte(CommandTCP)
+	if vc.dst.UDP {
+		buf.WriteByte(CommandUDP)
+	} else {
+		buf.WriteByte(CommandTCP)
+	}
 
 	// Port AddrType Addr
 	binary.Write(buf, binary.BigEndian, uint16(vc.dst.Port))
@@ -111,7 +104,7 @@ func (vc *Conn) sendRequest() error {
 		return err
 	}
 
-	stream := cipher.NewCFBEncrypter(block, hashTimestamp(time.Now().UTC()))
+	stream := cipher.NewCFBEncrypter(block, hashTimestamp(timestamp))
 	stream.XORKeyStream(buf.Bytes(), buf.Bytes())
 	_, err = vc.Conn.Write(buf.Bytes())
 	return err
@@ -145,7 +138,7 @@ func (vc *Conn) recvResponse() error {
 func hashTimestamp(t time.Time) []byte {
 	md5hash := md5.New()
 	ts := make([]byte, 8)
-	binary.BigEndian.PutUint64(ts, uint64(t.UTC().Unix()))
+	binary.BigEndian.PutUint64(ts, uint64(t.Unix()))
 	md5hash.Write(ts)
 	md5hash.Write(ts)
 	md5hash.Write(ts)
@@ -154,7 +147,7 @@ func hashTimestamp(t time.Time) []byte {
 }
 
 // newConn return a Conn instance
-func newConn(conn net.Conn, id *ID, dst *DstAddr, security Security) *Conn {
+func newConn(conn net.Conn, id *ID, dst *DstAddr, security Security) (*Conn, error) {
 	randBytes := make([]byte, 33)
 	rand.Read(randBytes)
 	reqBodyIV := make([]byte, 16)
@@ -197,7 +190,7 @@ func newConn(conn net.Conn, id *ID, dst *DstAddr, security Security) *Conn {
 		reader = newAEADReader(conn, aead, respBodyIV[:])
 	}
 
-	return &Conn{
+	c := &Conn{
 		Conn:        conn,
 		id:          id,
 		dst:         dst,
@@ -210,4 +203,8 @@ func newConn(conn net.Conn, id *ID, dst *DstAddr, security Security) *Conn {
 		writer:      writer,
 		security:    security,
 	}
+	if err := c.sendRequest(); err != nil {
+		return nil, err
+	}
+	return c, nil
 }

component/vmess/user.go

@@ -50,5 +50,6 @@ func newAlterIDs(primary *ID, alterIDCount uint16) []*ID {
 		alterIDs[idx] = &ID{UUID: newid, CmdKey: primary.CmdKey[:]}
 		prevID = newid
 	}
+	alterIDs = append(alterIDs, primary)
 	return alterIDs
 }

component/vmess/vmess.go

@@ -0,0 +1,185 @@
+package vmess
+
+import (
+	"crypto/tls"
+	"fmt"
+	"math/rand"
+	"net"
+	"net/http"
+	"runtime"
+	"sync"
+
+	"github.com/gofrs/uuid"
+)
+
+// Version of vmess
+const Version byte = 1
+
+// Request Options
+const (
+	OptionChunkStream  byte = 1
+	OptionChunkMasking byte = 4
+)
+
+// Security type vmess
+type Security = byte
+
+// Cipher types
+const (
+	SecurityAES128GCM        Security = 3
+	SecurityCHACHA20POLY1305 Security = 4
+	SecurityNone             Security = 5
+)
+
+// CipherMapping return
+var CipherMapping = map[string]byte{
+	"none":              SecurityNone,
+	"aes-128-gcm":       SecurityAES128GCM,
+	"chacha20-poly1305": SecurityCHACHA20POLY1305,
+}
+
+var (
+	clientSessionCache tls.ClientSessionCache
+	once               sync.Once
+)
+
+// Command types
+const (
+	CommandTCP byte = 1
+	CommandUDP byte = 2
+)
+
+// Addr types
+const (
+	AtypIPv4       byte = 1
+	AtypDomainName byte = 2
+	AtypIPv6       byte = 3
+)
+
+// DstAddr store destination address
+type DstAddr struct {
+	UDP      bool
+	AddrType byte
+	Addr     []byte
+	Port     uint
+}
+
+// Client is vmess connection generator
+type Client struct {
+	user      []*ID
+	uuid      *uuid.UUID
+	security  Security
+	tls       bool
+	host      string
+	wsConfig  *WebsocketConfig
+	tlsConfig *tls.Config
+}
+
+// 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
+}
+
+// New return a Conn with net.Conn and DstAddr
+func (c *Client) New(conn net.Conn, dst *DstAddr) (net.Conn, error) {
+	var err 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)
+}
+
+// NewClient return Client instance
+func NewClient(config Config) (*Client, error) {
+	uid, err := uuid.FromString(config.UUID)
+	if err != nil {
+		return nil, err
+	}
+
+	var security Security
+	switch config.Security {
+	case "aes-128-gcm":
+		security = SecurityAES128GCM
+	case "chacha20-poly1305":
+		security = SecurityCHACHA20POLY1305
+	case "none":
+		security = SecurityNone
+	case "auto":
+		security = SecurityCHACHA20POLY1305
+		if runtime.GOARCH == "amd64" || runtime.GOARCH == "s390x" || runtime.GOARCH == "arm64" {
+			security = SecurityAES128GCM
+		}
+	default:
+		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,
+	}, nil
+}
+
+func getClientSessionCache() tls.ClientSessionCache {
+	once.Do(func() {
+		clientSessionCache = tls.NewLRUClientSessionCache(128)
+	})
+	return clientSessionCache
+}

component/vmess/websocket.go

@@ -0,0 +1,161 @@
+package vmess
+
+import (
+	"crypto/tls"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/gorilla/websocket"
+)
+
+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
+}
+
+// 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 {
+			return 0, err
+		}
+
+		nBytes, err := reader.Read(b)
+		if err == io.EOF {
+			wsc.reader = nil
+			continue
+		}
+		return nBytes, err
+	}
+}
+
+// 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
+	}
+	return len(b), nil
+}
+
+func (wsc *websocketConn) Close() error {
+	var errors []string
+	if err := wsc.conn.WriteControl(websocket.CloseMessage, websocket.FormatCloseMessage(websocket.CloseNormalClosure, ""), time.Now().Add(time.Second*5)); err != nil {
+		errors = append(errors, err.Error())
+	}
+	if err := wsc.conn.Close(); err != nil {
+		errors = append(errors, err.Error())
+	}
+	if len(errors) > 0 {
+		return fmt.Errorf("Failed to close connection: %s", strings.Join(errors, ","))
+	}
+	return nil
+}
+
+func (wsc *websocketConn) getReader() (io.Reader, error) {
+	if wsc.reader != nil {
+		return wsc.reader, nil
+	}
+
+	_, reader, err := wsc.conn.NextReader()
+	if err != nil {
+		return nil, err
+	}
+	wsc.reader = reader
+	return reader, nil
+}
+
+func (wsc *websocketConn) LocalAddr() net.Addr {
+	return wsc.conn.LocalAddr()
+}
+
+func (wsc *websocketConn) RemoteAddr() net.Addr {
+	return wsc.remoteAddr
+}
+
+func (wsc *websocketConn) SetDeadline(t time.Time) error {
+	if err := wsc.SetReadDeadline(t); err != nil {
+		return err
+	}
+	return wsc.SetWriteDeadline(t)
+}
+
+func (wsc *websocketConn) SetReadDeadline(t time.Time) error {
+	return wsc.conn.SetReadDeadline(t)
+}
+
+func (wsc *websocketConn) SetWriteDeadline(t time.Time) error {
+	return wsc.conn.SetWriteDeadline(t)
+}
+
+func NewWebsocketConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
+	dialer := &websocket.Dialer{
+		NetDial: func(network, addr string) (net.Conn, error) {
+			return conn, nil
+		},
+		ReadBufferSize:   4 * 1024,
+		WriteBufferSize:  4 * 1024,
+		HandshakeTimeout: time.Second * 8,
+	}
+
+	scheme := "ws"
+	if c.TLS {
+		scheme = "wss"
+		dialer.TLSClientConfig = c.TLSConfig
+	}
+
+	host, port, _ := net.SplitHostPort(c.Host)
+	if (scheme == "ws" && port != "80") || (scheme == "wss" && port != "443") {
+		host = c.Host
+	}
+
+	uri := url.URL{
+		Scheme: scheme,
+		Host:   host,
+		Path:   c.Path,
+	}
+
+	headers := http.Header{}
+	if c.Headers != nil {
+		for k := range c.Headers {
+			headers.Add(k, c.Headers.Get(k))
+		}
+	}
+
+	wsConn, resp, err := dialer.Dial(uri.String(), headers)
+	if err != nil {
+		reason := err.Error()
+		if resp != nil {
+			reason = resp.Status
+		}
+		return nil, fmt.Errorf("Dial %s error: %s", host, reason)
+	}
+
+	return &websocketConn{
+		conn:       wsConn,
+		remoteAddr: conn.RemoteAddr(),
+	}, nil
+}

config/config.go

@@ -1,407 +1,562 @@
 package config
 
 import (
-	"bufio"
 	"fmt"
+	"net"
 	"net/url"
 	"os"
-	"strconv"
 	"strings"
-	"sync"
-	"time"
 
-	"github.com/Dreamacro/clash/adapters/remote"
+	"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"
 	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/clash/observable"
+	"github.com/Dreamacro/clash/dns"
+	"github.com/Dreamacro/clash/log"
 	R "github.com/Dreamacro/clash/rules"
+	T "github.com/Dreamacro/clash/tunnel"
 
-	log "github.com/sirupsen/logrus"
-	"gopkg.in/ini.v1"
-)
-
-var (
-	config *Config
-	once   sync.Once
+	yaml "gopkg.in/yaml.v2"
 )
 
 // General config
 type General struct {
-	Port      int
-	SocksPort int
-	RedirPort int
-	AllowLan  bool
-	Mode      Mode
-	LogLevel  C.LogLevel
+	Port               int          `json:"port"`
+	SocksPort          int          `json:"socks-port"`
+	RedirPort          int          `json:"redir-port"`
+	Authentication     []string     `json:"authentication"`
+	AllowLan           bool         `json:"allow-lan"`
+	BindAddress        string       `json:"bind-address"`
+	Mode               T.Mode       `json:"mode"`
+	LogLevel           log.LogLevel `json:"log-level"`
+	ExternalController string       `json:"-"`
+	ExternalUI         string       `json:"-"`
+	Secret             string       `json:"-"`
 }
 
-// ProxyConfig is update proxy schema
-type ProxyConfig struct {
-	Port      *int
-	SocksPort *int
-	RedirPort *int
-	AllowLan  *bool
+// 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
+}
+
+// FallbackFilter config
+type FallbackFilter struct {
+	GeoIP  bool         `yaml:"geoip"`
+	IPCIDR []*net.IPNet `yaml:"ipcidr"`
+}
+
+// Experimental config
+type Experimental struct {
+	IgnoreResolveFail bool `yaml:"ignore-resolve-fail"`
 }
 
 // Config is clash config manager
 type Config struct {
-	general    *General
-	rules      []C.Rule
-	proxies    map[string]C.Proxy
-	lastUpdate time.Time
-
-	event      chan<- interface{}
-	reportCh   chan interface{}
-	observable *observable.Observable
+	General      *General
+	DNS          *DNS
+	Experimental *Experimental
+	Hosts        *trie.Trie
+	Rules        []C.Rule
+	Users        []auth.AuthUser
+	Proxies      map[string]C.Proxy
+	Providers    map[string]provider.ProxyProvider
 }
 
-// Event is event of clash config
-type Event struct {
-	Type    string
-	Payload interface{}
+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"`
 }
 
-// Subscribe config stream
-func (c *Config) Subscribe() observable.Subscription {
-	sub, _ := c.observable.Subscribe()
-	return sub
+type rawFallbackFilter struct {
+	GeoIP  bool     `yaml:"geoip"`
+	IPCIDR []string `yaml:"ipcidr"`
 }
 
-// Report return a channel for collecting report message
-func (c *Config) Report() chan<- interface{} {
-	return c.reportCh
-}
+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"`
+	LogLevel           log.LogLevel `yaml:"log-level"`
+	ExternalController string       `yaml:"external-controller"`
+	ExternalUI         string       `yaml:"external-ui"`
+	Secret             string       `yaml:"secret"`
 
-func (c *Config) readConfig() (*ini.File, error) {
-	if _, err := os.Stat(C.ConfigPath); os.IsNotExist(err) {
-		return nil, err
-	}
-	return ini.LoadSources(
-		ini.LoadOptions{
-			AllowBooleanKeys:    true,
-			UnparseableSections: []string{"Rule"},
-		},
-		C.ConfigPath,
-	)
+	ProxyProvider map[string]map[string]interface{} `yaml:"proxy-provider"`
+	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"`
 }
 
 // Parse config
-func (c *Config) Parse() error {
-	cfg, err := c.readConfig()
+func Parse(buf []byte) (*Config, error) {
+	config := &Config{}
+
+	// config with some default value
+	rawCfg := &rawConfig{
+		AllowLan:       false,
+		BindAddress:    "*",
+		Mode:           T.Rule,
+		Authentication: []string{},
+		LogLevel:       log.INFO,
+		Hosts:          map[string]string{},
+		Rule:           []string{},
+		Proxy:          []map[string]interface{}{},
+		ProxyGroup:     []map[string]interface{}{},
+		Experimental: Experimental{
+			IgnoreResolveFail: true,
+		},
+		DNS: rawDNS{
+			Enable:      false,
+			FakeIPRange: "198.18.0.1/16",
+			FallbackFilter: rawFallbackFilter{
+				GeoIP:  true,
+				IPCIDR: []string{},
+			},
+		},
+	}
+	if err := yaml.Unmarshal(buf, &rawCfg); err != nil {
+		return nil, err
+	}
+
+	config.Experimental = &rawCfg.Experimental
+
+	general, err := parseGeneral(rawCfg)
 	if err != nil {
-		return err
+		return nil, err
 	}
+	config.General = general
 
-	if err := c.parseGeneral(cfg); err != nil {
-		return err
-	}
-
-	if err := c.parseProxies(cfg); err != nil {
-		return err
-	}
-
-	return c.parseRules(cfg)
-}
-
-// Proxies return proxies of clash
-func (c *Config) Proxies() map[string]C.Proxy {
-	return c.proxies
-}
-
-// Rules return rules of clash
-func (c *Config) Rules() []C.Rule {
-	return c.rules
-}
-
-// SetMode change mode of clash
-func (c *Config) SetMode(mode Mode) {
-	c.general.Mode = mode
-	c.event <- &Event{Type: "mode", Payload: mode}
-}
-
-// SetLogLevel change log level of clash
-func (c *Config) SetLogLevel(level C.LogLevel) {
-	c.general.LogLevel = level
-	c.event <- &Event{Type: "log-level", Payload: level}
-}
-
-// General return clash general config
-func (c *Config) General() General {
-	return *c.general
-}
-
-// UpdateRules is a function for hot reload rules
-func (c *Config) UpdateRules() error {
-	cfg, err := c.readConfig()
+	proxies, providers, err := parseProxies(rawCfg)
 	if err != nil {
-		return err
+		return nil, err
 	}
+	config.Proxies = proxies
+	config.Providers = providers
 
-	return c.parseRules(cfg)
+	rules, err := parseRules(rawCfg, proxies)
+	if err != nil {
+		return nil, err
+	}
+	config.Rules = rules
+
+	dnsCfg, err := parseDNS(rawCfg.DNS)
+	if err != nil {
+		return nil, err
+	}
+	config.DNS = dnsCfg
+
+	hosts, err := parseHosts(rawCfg)
+	if err != nil {
+		return nil, err
+	}
+	config.Hosts = hosts
+
+	config.Users = parseAuthentication(rawCfg.Authentication)
+	return config, nil
 }
 
-func (c *Config) parseGeneral(cfg *ini.File) error {
-	general := cfg.Section("General")
+func parseGeneral(cfg *rawConfig) (*General, error) {
+	port := cfg.Port
+	socksPort := cfg.SocksPort
+	redirPort := cfg.RedirPort
+	allowLan := cfg.AllowLan
+	bindAddress := cfg.BindAddress
+	externalController := cfg.ExternalController
+	externalUI := cfg.ExternalUI
+	secret := cfg.Secret
+	mode := cfg.Mode
+	logLevel := cfg.LogLevel
 
-	port := general.Key("port").RangeInt(0, 1, 65535)
-	socksPort := general.Key("socks-port").RangeInt(0, 1, 65535)
-	redirPort := general.Key("redir-port").RangeInt(0, 1, 65535)
-	allowLan := general.Key("allow-lan").MustBool()
-	logLevelString := general.Key("log-level").MustString(C.INFO.String())
-	modeString := general.Key("mode").MustString(Rule.String())
+	if externalUI != "" {
+		externalUI = C.Path.Reslove(externalUI)
 
-	mode, exist := ModeMapping[modeString]
-	if !exist {
-		return fmt.Errorf("General.mode value invalid")
+		if _, err := os.Stat(externalUI); os.IsNotExist(err) {
+			return nil, fmt.Errorf("external-ui: %s not exist", externalUI)
+		}
 	}
 
-	logLevel, exist := C.LogLevelMapping[logLevelString]
-	if !exist {
-		return fmt.Errorf("General.log-level value invalid")
+	general := &General{
+		Port:               port,
+		SocksPort:          socksPort,
+		RedirPort:          redirPort,
+		AllowLan:           allowLan,
+		BindAddress:        bindAddress,
+		Mode:               mode,
+		LogLevel:           logLevel,
+		ExternalController: externalController,
+		ExternalUI:         externalUI,
+		Secret:             secret,
 	}
-
-	c.general = &General{
-		Port:      port,
-		SocksPort: socksPort,
-		RedirPort: redirPort,
-		AllowLan:  allowLan,
-		Mode:      mode,
-		LogLevel:  logLevel,
-	}
-
-	if restAddr := general.Key("external-controller").String(); restAddr != "" {
-		c.event <- &Event{Type: "external-controller", Payload: restAddr}
-	}
-
-	c.UpdateGeneral(*c.general)
-	return nil
+	return general, nil
 }
 
-// UpdateGeneral dispatch update event
-func (c *Config) UpdateGeneral(general General) {
-	c.UpdateProxy(ProxyConfig{
-		Port:      &general.Port,
-		SocksPort: &general.SocksPort,
-		RedirPort: &general.RedirPort,
-		AllowLan:  &general.AllowLan,
-	})
-	c.event <- &Event{Type: "mode", Payload: general.Mode}
-	c.event <- &Event{Type: "log-level", Payload: general.LogLevel}
-}
+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
 
-// UpdateProxy dispatch update proxy event
-func (c *Config) UpdateProxy(pc ProxyConfig) {
-	if pc.AllowLan != nil {
-		c.general.AllowLan = *pc.AllowLan
-	}
+	defer func() {
+		// Destroy already created provider when err != nil
+		if err != nil {
+			for _, provider := range providersMap {
+				provider.Destroy()
+			}
+		}
+	}()
 
-	c.general.Port = *or(pc.Port, &c.general.Port)
-	if c.general.Port != 0 && (pc.AllowLan != nil || pc.Port != nil) {
-		c.event <- &Event{Type: "http-addr", Payload: genAddr(c.general.Port, c.general.AllowLan)}
-	}
-
-	c.general.SocksPort = *or(pc.SocksPort, &c.general.SocksPort)
-	if c.general.SocksPort != 0 && (pc.AllowLan != nil || pc.SocksPort != nil) {
-		c.event <- &Event{Type: "socks-addr", Payload: genAddr(c.general.SocksPort, c.general.AllowLan)}
-	}
-
-	c.general.RedirPort = *or(pc.RedirPort, &c.general.RedirPort)
-	if c.general.RedirPort != 0 && (pc.AllowLan != nil || pc.RedirPort != nil) {
-		c.event <- &Event{Type: "redir-addr", Payload: genAddr(c.general.RedirPort, c.general.AllowLan)}
-	}
-}
-
-func (c *Config) parseProxies(cfg *ini.File) error {
-	proxies := make(map[string]C.Proxy)
-	proxiesConfig := cfg.Section("Proxy")
-	groupsConfig := cfg.Section("Proxy Group")
+	proxies["DIRECT"] = outbound.NewProxy(outbound.NewDirect())
+	proxies["REJECT"] = outbound.NewProxy(outbound.NewReject())
+	proxyList = append(proxyList, "DIRECT", "REJECT")
 
 	// parse proxy
-	for _, key := range proxiesConfig.Keys() {
-		proxy := key.Strings(",")
-		if len(proxy) == 0 {
-			continue
+	for idx, mapping := range proxiesConfig {
+		proxy, err := outbound.ParseProxy(mapping)
+		if err != nil {
+			return nil, nil, fmt.Errorf("Proxy %d: %w", idx, err)
 		}
-		switch proxy[0] {
-		// ss, server, port, cipter, password
-		case "ss":
-			if len(proxy) < 5 {
-				continue
-			}
-			ssURL := url.URL{
-				Scheme: "ss",
-				User:   url.UserPassword(proxy[3], proxy[4]),
-				Host:   fmt.Sprintf("%s:%s", proxy[1], proxy[2]),
-			}
-			option := parseOptions(5, proxy...)
-			ss, err := adapters.NewShadowSocks(key.Name(), ssURL.String(), option)
-			if err != nil {
-				return err
-			}
-			proxies[key.Name()] = ss
-		// socks5, server, port
-		case "socks5":
-			if len(proxy) < 3 {
-				continue
-			}
-			addr := fmt.Sprintf("%s:%s", proxy[1], proxy[2])
-			socks5 := adapters.NewSocks5(key.Name(), addr)
-			proxies[key.Name()] = socks5
-		// vmess, server, port, uuid, alterId, security
-		case "vmess":
-			if len(proxy) < 6 {
-				continue
-			}
-			addr := fmt.Sprintf("%s:%s", proxy[1], proxy[2])
-			alterID, err := strconv.Atoi(proxy[4])
-			if err != nil {
-				return err
-			}
-			option := parseOptions(6, proxy...)
-			vmess, err := adapters.NewVmess(key.Name(), addr, proxy[3], uint16(alterID), proxy[5], option)
-			if err != nil {
-				return err
-			}
-			proxies[key.Name()] = vmess
+
+		if _, exist := proxies[proxy.Name()]; exist {
+			return nil, nil, fmt.Errorf("Proxy %s is the duplicate name", proxy.Name())
+		}
+		proxies[proxy.Name()] = proxy
+		proxyList = append(proxyList, proxy.Name())
+	}
+
+	// keep the origional order of ProxyGroups in config file
+	for idx, mapping := range groupsConfig {
+		groupName, existName := mapping["name"].(string)
+		if !existName {
+			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); 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 _, key := range groupsConfig.Keys() {
-		rule := strings.Split(key.Value(), ",")
-		rule = trimArr(rule)
-		switch rule[0] {
-		case "url-test":
-			if len(rule) < 4 {
-				return fmt.Errorf("URLTest need more than 4 param")
-			}
-			proxyNames := rule[1 : len(rule)-2]
-			delay, _ := strconv.Atoi(rule[len(rule)-1])
-			url := rule[len(rule)-2]
-			var ps []C.Proxy
-			for _, name := range proxyNames {
-				if p, ok := proxies[name]; ok {
-					ps = append(ps, p)
-				}
-			}
-
-			adapter, err := adapters.NewURLTest(key.Name(), ps, url, time.Duration(delay)*time.Second)
-			if err != nil {
-				return fmt.Errorf("Config error: %s", err.Error())
-			}
-			proxies[key.Name()] = adapter
-		case "select":
-			if len(rule) < 2 {
-				return fmt.Errorf("Selector need more than 2 param")
-			}
-			proxyNames := rule[1:]
-			selectProxy := make(map[string]C.Proxy)
-			for _, name := range proxyNames {
-				proxy, exist := proxies[name]
-				if !exist {
-					return fmt.Errorf("Proxy %s not exist", name)
-				}
-				selectProxy[name] = proxy
-			}
-			selector, err := adapters.NewSelector(key.Name(), selectProxy)
-			if err != nil {
-				return fmt.Errorf("Selector create error: %s", err.Error())
-			}
-			proxies[key.Name()] = selector
+	for idx, mapping := range groupsConfig {
+		group, err := outboundgroup.ParseProxyGroup(mapping, proxies, providersMap)
+		if err != nil {
+			return nil, nil, fmt.Errorf("ProxyGroup[%d]: %w", idx, err)
 		}
+
+		groupName := group.Name()
+		if _, exist := proxies[groupName]; exist {
+			return nil, nil, fmt.Errorf("ProxyGroup %s: the duplicate name", groupName)
+		}
+
+		proxies[groupName] = outbound.NewProxy(group)
 	}
 
-	// init proxy
-	proxies["GLOBAL"], _ = adapters.NewSelector("GLOBAL", proxies)
-	proxies["DIRECT"] = adapters.NewDirect()
-	proxies["REJECT"] = adapters.NewReject()
-
-	c.proxies = proxies
-	c.event <- &Event{Type: "proxies", Payload: proxies}
-	return nil
-}
-
-func (c *Config) parseRules(cfg *ini.File) error {
-	rules := []C.Rule{}
-
-	rulesConfig := cfg.Section("Rule")
-	// parse rules
-	reader := bufio.NewReader(strings.NewReader(rulesConfig.Body()))
-	for {
-		line, _, err := reader.ReadLine()
-		if err != nil {
-			break
-		}
-
-		rule := strings.Split(string(line), ",")
-		if len(rule) < 3 {
+	// initial compatible provier
+	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
+		}
+	}
+
+	ps := []C.Proxy{}
+	for _, v := range proxyList {
+		ps = append(ps, proxies[v])
+	}
+	hc := provider.NewHealthCheck(ps, "", 0)
+	pd, _ := provider.NewCompatibleProvier(provider.ReservedName, ps, hc)
+	providersMap[provider.ReservedName] = pd
+
+	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) {
+	rules := []C.Rule{}
+
+	rulesConfig := cfg.Rule
+	// parse rules
+	for idx, line := range rulesConfig {
+		rule := trimArr(strings.Split(line, ","))
+		var (
+			payload string
+			target  string
+			params  = []string{}
+		)
+
+		switch l := len(rule); {
+		case l == 2:
+			target = rule[1]
+		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)
+		}
+
+		if _, ok := proxies[target]; !ok {
+			return nil, fmt.Errorf("Rules[%d] [%s] error: proxy [%s] not found", idx, line, target)
+		}
+
 		rule = trimArr(rule)
+		params = trimArr(params)
+		var (
+			parseErr error
+			parsed   C.Rule
+		)
+
 		switch rule[0] {
 		case "DOMAIN":
-			rules = append(rules, R.NewDomain(rule[1], rule[2]))
+			parsed = R.NewDomain(payload, target)
 		case "DOMAIN-SUFFIX":
-			rules = append(rules, R.NewDomainSuffix(rule[1], rule[2]))
+			parsed = R.NewDomainSuffix(payload, target)
 		case "DOMAIN-KEYWORD":
-			rules = append(rules, R.NewDomainKeyword(rule[1], rule[2]))
+			parsed = R.NewDomainKeyword(payload, target)
 		case "GEOIP":
-			rules = append(rules, R.NewGEOIP(rule[1], rule[2]))
+			noResolve := R.HasNoResolve(params)
+			parsed = R.NewGEOIP(payload, target, noResolve)
 		case "IP-CIDR", "IP-CIDR6":
-			rules = append(rules, R.NewIPCIDR(rule[1], rule[2]))
+			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":
+			parsed, parseErr = R.NewIPCIDR(payload, target, R.WithIPCIDRSourceIP(true), R.WithIPCIDRNoResolve(true))
+		case "SRC-PORT":
+			parsed, parseErr = R.NewPort(payload, target, true)
+		case "DST-PORT":
+			parsed, parseErr = R.NewPort(payload, target, false)
+		case "MATCH":
+			fallthrough
+		// deprecated when bump to 1.0
 		case "FINAL":
-			rules = append(rules, R.NewFinal(rule[2]))
+			parsed = R.NewMatch(target)
+		default:
+			parseErr = fmt.Errorf("unsupported rule type %s", rule[0])
+		}
+
+		if parseErr != nil {
+			return nil, fmt.Errorf("Rules[%d] [%s] error: %s", idx, line, parseErr.Error())
+		}
+
+		rules = append(rules, parsed)
+	}
+
+	return rules, nil
+}
+
+func parseHosts(cfg *rawConfig) (*trie.Trie, error) {
+	tree := trie.New()
+	if len(cfg.Hosts) != 0 {
+		for domain, ipStr := range cfg.Hosts {
+			ip := net.ParseIP(ipStr)
+			if ip == nil {
+				return nil, fmt.Errorf("%s is not a valid IP", ipStr)
+			}
+			tree.Insert(domain, ip)
 		}
 	}
 
-	c.rules = rules
-	c.event <- &Event{Type: "rules", Payload: rules}
-	return nil
+	return tree, nil
 }
 
-func (c *Config) handleResponseMessage() {
-	for elm := range c.reportCh {
-		event := elm.(*Event)
-		switch event.Type {
-		case "http-addr":
-			if event.Payload.(bool) == false {
-				log.Errorf("Listening HTTP proxy at %d error", c.general.Port)
-				c.general.Port = 0
-			}
-		case "socks-addr":
-			if event.Payload.(bool) == false {
-				log.Errorf("Listening SOCKS proxy at %d error", c.general.SocksPort)
-				c.general.SocksPort = 0
-			}
-		case "redir-addr":
-			if event.Payload.(bool) == false {
-				log.Errorf("Listening Redir proxy at %d error", c.general.RedirPort)
-				c.general.RedirPort = 0
+func hostWithDefaultPort(host string, defPort string) (string, error) {
+	if !strings.Contains(host, ":") {
+		host += ":"
+	}
+
+	hostname, port, err := net.SplitHostPort(host)
+	if err != nil {
+		return "", err
+	}
+
+	if port == "" {
+		port = defPort
+	}
+
+	return net.JoinHostPort(hostname, port), nil
+}
+
+func parseNameServer(servers []string) ([]dns.NameServer, error) {
+	nameservers := []dns.NameServer{}
+
+	for idx, server := range servers {
+		// parse without scheme .e.g 8.8.8.8:53
+		if !strings.Contains(server, "://") {
+			server = "udp://" + server
+		}
+		u, err := url.Parse(server)
+		if err != nil {
+			return nil, fmt.Errorf("DNS NameServer[%d] format error: %s", idx, err.Error())
+		}
+
+		var host, dnsNetType string
+		switch u.Scheme {
+		case "udp":
+			host, err = hostWithDefaultPort(u.Host, "53")
+			dnsNetType = "" // UDP
+		case "tcp":
+			host, err = hostWithDefaultPort(u.Host, "53")
+			dnsNetType = "tcp" // TCP
+		case "tls":
+			host, 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()
+			dnsNetType = "https" // DNS over HTTPS
+		default:
+			return nil, fmt.Errorf("DNS NameServer[%d] unsupport scheme: %s", idx, u.Scheme)
+		}
+
+		if err != nil {
+			return nil, fmt.Errorf("DNS NameServer[%d] format error: %s", idx, err.Error())
+		}
+
+		nameservers = append(
+			nameservers,
+			dns.NameServer{
+				Net:  dnsNetType,
+				Addr: host,
+			},
+		)
+	}
+	return nameservers, nil
+}
+
+func parseFallbackIPCIDR(ips []string) ([]*net.IPNet, error) {
+	ipNets := []*net.IPNet{}
+
+	for idx, ip := range ips {
+		_, ipnet, err := net.ParseCIDR(ip)
+		if err != nil {
+			return nil, fmt.Errorf("DNS FallbackIP[%d] format error: %s", idx, err.Error())
+		}
+		ipNets = append(ipNets, ipnet)
+	}
+
+	return ipNets, nil
+}
+
+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")
+	}
+
+	dnsCfg := &DNS{
+		Enable:       cfg.Enable,
+		Listen:       cfg.Listen,
+		IPv6:         cfg.IPv6,
+		EnhancedMode: cfg.EnhancedMode,
+		FallbackFilter: FallbackFilter{
+			IPCIDR: []*net.IPNet{},
+		},
+	}
+	var err error
+	if dnsCfg.NameServer, err = parseNameServer(cfg.NameServer); err != nil {
+		return nil, err
+	}
+
+	if dnsCfg.Fallback, err = parseNameServer(cfg.Fallback); err != nil {
+		return nil, err
+	}
+
+	if cfg.EnhancedMode == dns.FAKEIP {
+		_, ipnet, err := net.ParseCIDR(cfg.FakeIPRange)
+		if err != nil {
+			return nil, err
+		}
+
+		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
+		}
+
+		dnsCfg.FakeIPRange = pool
 	}
-}
 
-func newConfig() *Config {
-	event := make(chan interface{})
-	reportCh := make(chan interface{})
-	config := &Config{
-		general:    &General{},
-		proxies:    make(map[string]C.Proxy),
-		rules:      []C.Rule{},
-		lastUpdate: time.Now(),
-
-		event:      event,
-		reportCh:   reportCh,
-		observable: observable.NewObservable(event),
+	dnsCfg.FallbackFilter.GeoIP = cfg.FallbackFilter.GeoIP
+	if fallbackip, err := parseFallbackIPCIDR(cfg.FallbackFilter.IPCIDR); err == nil {
+		dnsCfg.FallbackFilter.IPCIDR = fallbackip
 	}
-	go config.handleResponseMessage()
-	return config
+
+	return dnsCfg, nil
 }
 
-// Instance return singleton instance of Config
-func Instance() *Config {
-	once.Do(func() {
-		config = newConfig()
-	})
-	return config
+func parseAuthentication(rawRecords []string) []auth.AuthUser {
+	users := make([]auth.AuthUser, 0)
+	for _, line := range rawRecords {
+		userData := strings.SplitN(line, ":", 2)
+		if len(userData) == 2 {
+			users = append(users, auth.AuthUser{User: userData[0], Pass: userData[1]})
+		}
+	}
+	return users
 }

config/initial.go

@@ -3,14 +3,14 @@ package config
 import (
 	"archive/tar"
 	"compress/gzip"
+	"fmt"
 	"io"
 	"net/http"
 	"os"
 	"strings"
 
 	C "github.com/Dreamacro/clash/constant"
-
-	log "github.com/sirupsen/logrus"
+	"github.com/Dreamacro/clash/log"
 )
 
 func downloadMMDB(path string) (err error) {
@@ -54,19 +54,27 @@ func downloadMMDB(path string) (err error) {
 }
 
 // Init prepare necessary files
-func Init() {
-	// initial config.ini
-	if _, err := os.Stat(C.ConfigPath); os.IsNotExist(err) {
-		log.Info("Can't find config, create a empty file")
-		os.OpenFile(C.ConfigPath, os.O_CREATE|os.O_WRONLY, 0644)
+func Init(dir string) error {
+	// initial homedir
+	if _, err := os.Stat(dir); os.IsNotExist(err) {
+		if err := os.MkdirAll(dir, 0777); err != nil {
+			return fmt.Errorf("Can't create config directory %s: %s", dir, err.Error())
+		}
+	}
+
+	// initial config.yaml
+	if _, err := os.Stat(C.Path.Config()); os.IsNotExist(err) {
+		log.Infoln("Can't find config, create an empty file")
+		os.OpenFile(C.Path.Config(), os.O_CREATE|os.O_WRONLY, 0644)
 	}
 
 	// initial mmdb
-	if _, err := os.Stat(C.MMDBPath); os.IsNotExist(err) {
-		log.Info("Can't find MMDB, start download")
-		err := downloadMMDB(C.MMDBPath)
+	if _, err := os.Stat(C.Path.MMDB()); os.IsNotExist(err) {
+		log.Infoln("Can't find MMDB, start download")
+		err := downloadMMDB(C.Path.MMDB())
 		if err != nil {
-			log.Fatalf("Can't download MMDB: %s", err.Error())
+			return fmt.Errorf("Can't download MMDB: %s", err.Error())
 		}
 	}
+	return nil
 }

config/mode.go

@@ -1,31 +0,0 @@
-package config
-
-type Mode int
-
-var (
-	// ModeMapping is a mapping for Mode enum
-	ModeMapping = map[string]Mode{
-		"Global": Global,
-		"Rule":   Rule,
-		"Direct": Direct,
-	}
-)
-
-const (
-	Global Mode = iota
-	Rule
-	Direct
-)
-
-func (m Mode) String() string {
-	switch m {
-	case Global:
-		return "Global"
-	case Rule:
-		return "Rule"
-	case Direct:
-		return "Direct"
-	default:
-		return "Unknow"
-	}
-}

config/utils.go

@@ -3,6 +3,9 @@ package config
 import (
 	"fmt"
 	"strings"
+
+	"github.com/Dreamacro/clash/adapters/outboundgroup"
+	"github.com/Dreamacro/clash/common/structure"
 )
 
 func trimArr(arr []string) (r []string) {
@@ -12,13 +15,6 @@ func trimArr(arr []string) (r []string) {
 	return
 }
 
-func genAddr(port int, allowLan bool) string {
-	if allowLan {
-		return fmt.Sprintf(":%d", port)
-	}
-	return fmt.Sprintf("127.0.0.1:%d", port)
-}
-
 func or(pointers ...*int) *int {
 	for _, p := range pointers {
 		if p != nil {
@@ -28,19 +24,134 @@ func or(pointers ...*int) *int {
 	return pointers[len(pointers)-1]
 }
 
-func parseOptions(startIdx int, params ...string) map[string]string {
-	mapping := make(map[string]string)
-	if len(params) <= startIdx {
-		return mapping
+// 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{}) error {
+	type graphNode struct {
+		indegree int
+		// topological order
+		topo int
+		// the origional data in `groupsConfig`
+		data map[string]interface{}
+		// `outdegree` and `from` are used in loop locating
+		outdegree int
+		option    *outboundgroup.GroupCommonOption
+		from      []string
 	}
 
-	for _, option := range params[startIdx:] {
-		pair := strings.SplitN(option, "=", 2)
-		if len(pair) != 2 {
+	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 := &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, option, nil}
+		}
+
+		for _, proxy := range option.Proxies {
+			if node, ex := graph[proxy]; ex {
+				node.indegree++
+			} else {
+				graph[proxy] = &graphNode{1, -1, nil, 0, nil, nil}
+			}
+		}
+	}
+	// Step 1.2 Topological Sort
+	// topological index of **ProxyGroup**
+	index := 0
+	queue := make([]string, 0)
+	for name, node := range graph {
+		// in the begning, put nodes that have `node.indegree == 0` into queue.
+		if node.indegree == 0 {
+			queue = append(queue, name)
+		}
+	}
+	// every element in queue have indegree == 0
+	for ; len(queue) > 0; queue = queue[1:] {
+		name := queue[0]
+		node := graph[name]
+		if node.option != nil {
+			index++
+			groupsConfig[len(groupsConfig)-index] = node.data
+			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)
+				}
+			}
+		}
+		delete(graph, name)
+	}
+
+	// no loop is detected, return sorted ProxyGroup
+	if len(graph) == 0 {
+		return nil
+	}
+
+	// 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.option == nil {
 			continue
 		}
 
-		mapping[strings.Trim(pair[0], " ")] = strings.Trim(pair[1], " ")
+		if len(node.option.Proxies) == 0 {
+			continue
+		}
+
+		for _, proxy := range node.option.Proxies {
+			node.outdegree++
+			child := graph[proxy]
+			if child.from == nil {
+				child.from = make([]string, 0, child.indegree)
+			}
+			child.from = append(child.from, name)
+		}
 	}
-	return mapping
+	// Step 2.2 remove nodes outside the loop. so that we have only the loops remain in `graph`
+	queue = make([]string, 0)
+	// initialize queue with node have outdegree == 0
+	for name, node := range graph {
+		if node.outdegree == 0 {
+			queue = append(queue, name)
+		}
+	}
+	// every element in queue have outdegree == 0
+	for ; len(queue) > 0; queue = queue[1:] {
+		name := queue[0]
+		node := graph[name]
+		for _, f := range node.from {
+			graph[f].outdegree--
+			if graph[f].outdegree == 0 {
+				queue = append(queue, f)
+			}
+		}
+		delete(graph, name)
+	}
+	// Step 2.3 report the elements in loop
+	loopElements := make([]string, 0, len(graph))
+	for name := range graph {
+		loopElements = append(loopElements, name)
+		delete(graph, name)
+	}
+	return fmt.Errorf("Loop is detected in ProxyGroup, please check following ProxyGroups: %v", loopElements)
 }

constant/adapters.go

@@ -1,34 +1,81 @@
 package constant
 
 import (
+	"context"
+	"fmt"
 	"net"
+	"time"
 )
 
 // Adapter Type
 const (
 	Direct AdapterType = iota
+	Fallback
 	Reject
 	Selector
 	Shadowsocks
+	Snell
 	Socks5
+	Http
 	URLTest
 	Vmess
+	LoadBalance
 )
 
-type ProxyAdapter interface {
-	Conn() net.Conn
-	Close()
+type ServerAdapter interface {
+	net.Conn
+	Metadata() *Metadata
 }
 
-type ServerAdapter interface {
-	Addr() *Addr
-	Close()
+type Connection interface {
+	Chains() Chain
+	AppendToChains(adapter ProxyAdapter)
+}
+
+type Chain []string
+
+func (c Chain) String() string {
+	switch len(c) {
+	case 0:
+		return ""
+	case 1:
+		return c[0]
+	default:
+		return fmt.Sprintf("%s[%s]", c[len(c)-1], c[0])
+	}
+}
+
+type Conn interface {
+	net.Conn
+	Connection
+}
+
+type PacketConn interface {
+	net.PacketConn
+	Connection
+}
+
+type ProxyAdapter interface {
+	Name() string
+	Type() AdapterType
+	DialContext(ctx context.Context, metadata *Metadata) (Conn, error)
+	DialUDP(metadata *Metadata) (PacketConn, net.Addr, error)
+	SupportUDP() bool
+	MarshalJSON() ([]byte, error)
+}
+
+type DelayHistory struct {
+	Time  time.Time `json:"time"`
+	Delay uint16    `json:"delay"`
 }
 
 type Proxy interface {
-	Name() string
-	Type() AdapterType
-	Generator(addr *Addr) (ProxyAdapter, error)
+	ProxyAdapter
+	Alive() bool
+	DelayHistory() []DelayHistory
+	Dial(metadata *Metadata) (Conn, error)
+	LastDelay() uint16
+	URLTest(ctx context.Context, url string) (uint16, error)
 }
 
 // AdapterType is enum of adapter type
@@ -38,19 +85,45 @@ 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:
+		return "Snell"
 	case Socks5:
 		return "Socks5"
+	case Http:
+		return "Http"
 	case URLTest:
 		return "URLTest"
 	case Vmess:
 		return "Vmess"
+	case LoadBalance:
+		return "LoadBalance"
 	default:
-		return "Unknow"
+		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)
+
+	// Close closes the underlaying connection.
+	Close() error
+
+	// LocalAddr returns the source IP/Port of packet
+	LocalAddr() net.Addr
+}

constant/addr.go

@@ -1,46 +0,0 @@
-package constant
-
-import (
-	"net"
-)
-
-// Socks addr type
-const (
-	AtypIPv4       = 1
-	AtypDomainName = 3
-	AtypIPv6       = 4
-
-	TCP NetWork = iota
-	UDP
-
-	HTTP SourceType = iota
-	SOCKS
-)
-
-type NetWork int
-
-func (n *NetWork) String() string {
-	if *n == TCP {
-		return "tcp"
-	}
-	return "udp"
-}
-
-type SourceType int
-
-// Addr is used to store connection address
-type Addr struct {
-	NetWork  NetWork
-	Source   SourceType
-	AddrType int
-	Host     string
-	IP       *net.IP
-	Port     string
-}
-
-func (addr *Addr) String() string {
-	if addr.Host == "" {
-		return addr.IP.String()
-	}
-	return addr.Host
-}

constant/config.go

@@ -1,51 +0,0 @@
-package constant
-
-import (
-	"os"
-	"os/user"
-	"path"
-
-	log "github.com/sirupsen/logrus"
-)
-
-const (
-	Name = "clash"
-)
-
-var (
-	HomeDir    string
-	ConfigPath string
-	MMDBPath   string
-)
-
-type General struct {
-	Mode      *string `json:"mode,omitempty"`
-	AllowLan  *bool   `json:"allow-lan,omitempty"`
-	Port      *int    `json:"port,omitempty"`
-	SocksPort *int    `json:"socks-port,omitempty"`
-	RedirPort *int    `json:"redir-port,omitempty"`
-	LogLevel  *string `json:"log-level,omitempty"`
-}
-
-func init() {
-	currentUser, err := user.Current()
-	if err != nil {
-		dir := os.Getenv("HOME")
-		if dir == "" {
-			log.Fatalf("Can't get current user: %s", err.Error())
-		}
-		HomeDir = dir
-	} else {
-		HomeDir = currentUser.HomeDir
-	}
-
-	dirPath := path.Join(HomeDir, ".config", Name)
-	if _, err := os.Stat(dirPath); os.IsNotExist(err) {
-		if err := os.MkdirAll(dirPath, 0777); err != nil {
-			log.Fatalf("Can't create config directory %s: %s", dirPath, err.Error())
-		}
-	}
-
-	ConfigPath = path.Join(dirPath, "config.ini")
-	MMDBPath = path.Join(dirPath, "Country.mmdb")
-}

constant/log.go

@@ -1,35 +0,0 @@
-package constant
-
-var (
-	// LogLevelMapping is a mapping for LogLevel enum
-	LogLevelMapping = map[string]LogLevel{
-		"error":   ERROR,
-		"warning": WARNING,
-		"info":    INFO,
-		"debug":   DEBUG,
-	}
-)
-
-const (
-	ERROR LogLevel = iota
-	WARNING
-	INFO
-	DEBUG
-)
-
-type LogLevel int
-
-func (l LogLevel) String() string {
-	switch l {
-	case INFO:
-		return "info"
-	case WARNING:
-		return "warning"
-	case ERROR:
-		return "error"
-	case DEBUG:
-		return "debug"
-	default:
-		return "unknow"
-	}
-}

constant/metadata.go

@@ -0,0 +1,85 @@
+package constant
+
+import (
+	"encoding/json"
+	"net"
+)
+
+// Socks addr type
+const (
+	AtypIPv4       = 1
+	AtypDomainName = 3
+	AtypIPv6       = 4
+
+	TCP NetWork = iota
+	UDP
+
+	HTTP Type = iota
+	HTTPCONNECT
+	SOCKS
+	REDIR
+)
+
+type NetWork int
+
+func (n *NetWork) String() string {
+	if *n == TCP {
+		return "tcp"
+	}
+	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 `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) String() string {
+	if m.Host != "" {
+		return m.Host
+	} else if m.DstIP != nil {
+		return m.DstIP.String()
+	} else {
+		return "<nil>"
+	}
+}
+
+func (m *Metadata) Valid() bool {
+	return m.Host != "" || m.DstIP != nil
+}

constant/path.go

@@ -0,0 +1,58 @@
+package constant
+
+import (
+	"os"
+	P "path"
+	"path/filepath"
+)
+
+const Name = "clash"
+
+// Path is used to get the configuration path
+var Path *path
+
+type path struct {
+	homeDir    string
+	configFile string
+}
+
+func init() {
+	homeDir, err := os.UserHomeDir()
+	if err != nil {
+		homeDir, _ = os.Getwd()
+	}
+
+	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.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
+}
+
+func (p *path) Config() string {
+	return p.configFile
+}
+
+// Reslove return a absolute path or a relative path with homedir
+func (p *path) Reslove(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")
+}

constant/proxy.go

@@ -1,7 +0,0 @@
-package constant
-
-// ProxySignal is used to handle graceful shutdown of proxy
-type ProxySignal struct {
-	Done   chan<- struct{}
-	Closed <-chan struct{}
-}

constant/rule.go

@@ -7,7 +7,10 @@ const (
 	DomainKeyword
 	GEOIP
 	IPCIDR
-	FINAL
+	SrcIPCIDR
+	SrcPort
+	DstPort
+	MATCH
 )
 
 type RuleType int
@@ -21,19 +24,26 @@ func (rt RuleType) String() string {
 	case DomainKeyword:
 		return "DomainKeyword"
 	case GEOIP:
-		return "GEOIP"
+		return "GeoIP"
 	case IPCIDR:
 		return "IPCIDR"
-	case FINAL:
-		return "FINAL"
+	case SrcIPCIDR:
+		return "SrcIPCIDR"
+	case SrcPort:
+		return "SrcPort"
+	case DstPort:
+		return "DstPort"
+	case MATCH:
+		return "Match"
 	default:
-		return "Unknow"
+		return "Unknown"
 	}
 }
 
 type Rule interface {
 	RuleType() RuleType
-	IsMatch(addr *Addr) 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
-}

constant/version.go

@@ -0,0 +1,6 @@
+package constant
+
+var (
+	Version   = "unknown version"
+	BuildTime = "unknown time"
+)

dns/client.go

@@ -0,0 +1,21 @@
+package dns
+
+import (
+	"context"
+
+	D "github.com/miekg/dns"
+)
+
+type client struct {
+	*D.Client
+	Address string
+}
+
+func (c *client) Exchange(m *D.Msg) (msg *D.Msg, err error) {
+	return c.ExchangeContext(context.Background(), m)
+}
+
+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
+}

dns/doh.go

@@ -0,0 +1,72 @@
+package dns
+
+import (
+	"bytes"
+	"context"
+	"crypto/tls"
+	"io/ioutil"
+	"net/http"
+
+	D "github.com/miekg/dns"
+)
+
+const (
+	// dotMimeType is the DoH mimetype that should be used.
+	dotMimeType = "application/dns-message"
+)
+
+var dohTransport = &http.Transport{
+	TLSClientConfig: &tls.Config{ClientSessionCache: globalSessionCache},
+}
+
+type dohClient struct {
+	url string
+}
+
+func (dc *dohClient) Exchange(m *D.Msg) (msg *D.Msg, err error) {
+	return dc.ExchangeContext(context.Background(), m)
+}
+
+func (dc *dohClient) ExchangeContext(ctx context.Context, m *D.Msg) (msg *D.Msg, err error) {
+	req, err := dc.newRequest(m)
+	if err != nil {
+		return nil, err
+	}
+
+	req = req.WithContext(ctx)
+	return dc.doRequest(req)
+}
+
+// newRequest returns a new DoH request given a dns.Msg.
+func (dc *dohClient) newRequest(m *D.Msg) (*http.Request, error) {
+	buf, err := m.Pack()
+	if err != nil {
+		return nil, err
+	}
+
+	req, err := http.NewRequest(http.MethodPost, dc.url+"?bla=foo:443", bytes.NewReader(buf))
+	if err != nil {
+		return req, err
+	}
+
+	req.Header.Set("content-type", dotMimeType)
+	req.Header.Set("accept", dotMimeType)
+	return req, nil
+}
+
+func (dc *dohClient) doRequest(req *http.Request) (msg *D.Msg, err error) {
+	client := &http.Client{Transport: dohTransport}
+	resp, err := client.Do(req)
+	if err != nil {
+		return nil, err
+	}
+	defer resp.Body.Close()
+
+	buf, err := ioutil.ReadAll(resp.Body)
+	if err != nil {
+		return nil, err
+	}
+	msg = &D.Msg{}
+	err = msg.Unpack(buf)
+	return msg, err
+}

dns/filters.go

@@ -0,0 +1,26 @@
+package dns
+
+import "net"
+
+type fallbackFilter interface {
+	Match(net.IP) bool
+}
+
+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 == ""
+}
+
+type ipnetFilter struct {
+	ipnet *net.IPNet
+}
+
+func (inf *ipnetFilter) Match(ip net.IP) bool {
+	return inf.ipnet.Contains(ip)
+}