Chore: update dependencies

* Fix: HTTP Status Code `100 Continue` support

* Style: code style adjustment

.github/workflows/go.yml

@@ -0,0 +1,21 @@
+name: Go
+on: [push, pull_request]
+jobs:
+
+  build:
+    name: Build
+    runs-on: ubuntu-latest
+    steps:
+
+      - name: Set up Go 1.13
+        uses: actions/setup-go@v1
+        with:
+          go-version: 1.13
+        id: go
+
+      - name: Check out code into the Go module directory
+        uses: actions/checkout@v1
+
+      - name: Get dependencies
+        run: |
+          go test ./...

.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

@@ -1,17 +1,16 @@
 language: go
 sudo: false
 go:
-  - "1.10"
-before_install:
-  - go get -u github.com/golang/dep/cmd/dep
+  - '1.13'
 install:
-  - "$GOPATH/bin/dep ensure"
+  - "go mod download"
 env:
   global:
     - NAME=clash
     - BINDIR=bin
+    - GO111MODULE=on
 script:
-  - go test
+  - go test ./...
 before_deploy: make -j releases
 deploy:
   provider: releases

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
-COPY --from=builder /clash .
+
+RUN apk add --no-cache ca-certificates
 COPY --from=builder /Country.mmdb /root/.config/clash/
-EXPOSE 7890 7891
+COPY --from=builder /clash /
 ENTRYPOINT ["/clash"]

Gopkg.lock

@@ -1,85 +0,0 @@
-# This file is autogenerated, do not edit; changes may be undone by the next 'dep ensure'.
-
-
-[[projects]]
-  branch = "master"
-  name = "github.com/Yawning/chacha20"
-  packages = ["."]
-  revision = "e3b1f968fc6397b51d963fee8ec8711a47bc0ce8"
-
-[[projects]]
-  name = "github.com/eapache/queue"
-  packages = ["."]
-  revision = "44cc805cf13205b55f69e14bcb69867d1ae92f98"
-  version = "v1.1.0"
-
-[[projects]]
-  name = "github.com/oschwald/geoip2-golang"
-  packages = ["."]
-  revision = "7118115686e16b77967cdbf55d1b944fe14ad312"
-  version = "v1.2.1"
-
-[[projects]]
-  name = "github.com/oschwald/maxminddb-golang"
-  packages = ["."]
-  revision = "c5bec84d1963260297932a1b7a1753c8420717a7"
-  version = "v1.3.0"
-
-[[projects]]
-  name = "github.com/riobard/go-shadowsocks2"
-  packages = [
-    "core",
-    "shadowaead",
-    "shadowstream",
-    "socks"
-  ]
-  revision = "8346403248229fc7e10d7a259de8e9352a9d8830"
-  version = "v0.1.0"
-
-[[projects]]
-  name = "github.com/sirupsen/logrus"
-  packages = ["."]
-  revision = "c155da19408a8799da419ed3eeb0cb5db0ad5dbc"
-  version = "v1.0.5"
-
-[[projects]]
-  branch = "master"
-  name = "golang.org/x/crypto"
-  packages = [
-    "chacha20poly1305",
-    "hkdf",
-    "internal/chacha20",
-    "internal/subtle",
-    "poly1305",
-    "ssh/terminal"
-  ]
-  revision = "a8fb68e7206f8c78be19b432c58eb52a6aa34462"
-
-[[projects]]
-  branch = "master"
-  name = "golang.org/x/sys"
-  packages = [
-    "cpu",
-    "unix",
-    "windows"
-  ]
-  revision = "6c888cc515d3ed83fc103cf1d84468aad274b0a7"
-
-[[projects]]
-  name = "gopkg.in/eapache/channels.v1"
-  packages = ["."]
-  revision = "47238d5aae8c0fefd518ef2bee46290909cf8263"
-  version = "v1.1.0"
-
-[[projects]]
-  name = "gopkg.in/ini.v1"
-  packages = ["."]
-  revision = "06f5f3d67269ccec1fe5fe4134ba6e982984f7f5"
-  version = "v1.37.0"
-
-[solve-meta]
-  analyzer-name = "dep"
-  analyzer-version = 1
-  inputs-digest = "4297c505508c6cdd8c94fd4ef29bc6940c65fea81e125fcf871a316b6e671a71"
-  solver-name = "gps-cdcl"
-  solver-version = 1

Gopkg.toml

@@ -1,50 +0,0 @@
-# Gopkg.toml example
-#
-# Refer to https://github.com/golang/dep/blob/master/docs/Gopkg.toml.md
-# 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/oschwald/geoip2-golang"
-  version = "1.2.1"
-
-[[constraint]]
-  name = "github.com/riobard/go-shadowsocks2"
-  version = "0.1.0"
-
-[[constraint]]
-  name = "github.com/sirupsen/logrus"
-  version = "1.0.5"
-
-[[constraint]]
-  name = "gopkg.in/eapache/channels.v1"
-  version = "1.1.0"
-
-[[constraint]]
-  name = "gopkg.in/ini.v1"
-  version = "1.37.0"
-
-[prune]
-  go-tests = true
-  unused-packages = true

Makefile

@@ -1,19 +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
+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)-$@
 
-releases: linux macos
-	chmod +x $(BINDIR)/$(NAME)-*
-	gzip $(BINDIR)/$(NAME)-linux
-	gzip $(BINDIR)/$(NAME)-macos
+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)-$@.exe
+
+gz_releases=$(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

@@ -1,37 +1,58 @@
-# Clash
+<h1 align="center">
+  <img src="https://github.com/Dreamacro/clash/raw/master/docs/logo.png" alt="Clash" width="200">
+  <br>Clash<br>
+</h1>
 
-[![TravisCI](https://img.shields.io/travis/Dreamacro/clash.svg?style=flat-square)](https://travis-ci.org/Dreamacro/clash)
+<h4 align="center">A rule-based tunnel in Go.</h4>
 
-A rule based proxy in Go.
+<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>
+  <a href="https://goreportcard.com/report/github.com/Dreamacro/clash">
+    <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">
+  </a>
+</p>
 
 ## Features
 
-- HTTP/HTTPS and SOCKS proxy
-- Surge like configuration
+- Local HTTP/HTTPS/SOCKS server
+- Surge-like configuration format
 - GeoIP rule support
+- Supports Vmess, Shadowsocks, Snell and SOCKS5 protocol
+- Supports Netfilter TCP redirecting
+- Comprehensive HTTP API
 
 ## 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`.
@@ -40,38 +61,256 @@ 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.
 
-# A RESTful API for clash
-external-controller = 127.0.0.1:8080
+For example, you can use the current directory as the configuration directory:
 
-[Proxy]
-# name = ss, server, port, cipher, password
-# 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
-Proxy1 = ss, server1, port, AEAD_CHACHA20_POLY1305, password
-Proxy2 = ss, server2, port, AEAD_CHACHA20_POLY1305, password
-
-[Proxy Group]
-# url-test select which proxy will be used by benchmarking speed to a URL.
-# name = url-test, [proxys], url, interval(second)
-Proxy = url-test, Proxy1, Proxy2, http://www.google.com/generate_204, 300
-
-[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</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
+  # 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 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
+- IP-CIDR,127.0.0.0/8,DIRECT
+# rename SOURCE-IP-CIDR and would remove after prerelease
+- SRC-IP-CIDR,192.168.1.201/32,DIRECT
+- GEOIP,CN,DIRECT
+- DST-PORT,80,DIRECT
+- SRC-PORT,7777,DIRECT
+# FINAL would remove after prerelease
+# you also can use `FINAL,Proxy` or `FINAL,,Proxy` now
+- MATCH,auto
+```
+</details>
+
+## Documentations
+https://clash.gitbook.io/
+
+## Thanks
+
+[riobard/go-shadowsocks2](https://github.com/riobard/go-shadowsocks2)
+
+[v2ray/v2ray-core](https://github.com/v2ray/v2ray-core)
+
+## License
+
+[![FOSSA Status](https://app.fossa.io/api/projects/git%2Bgithub.com%2FDreamacro%2Fclash.svg?type=large)](https://app.fossa.io/projects/git%2Bgithub.com%2FDreamacro%2Fclash?ref=badge_large)
+
 ## TODO
 
-- [ ] Complementing the necessary rule operators
+- [x] Complementing the necessary rule operators
+- [x] Redir proxy
+- [x] UDP support
+- [ ] Connection manager

adapters/direct.go

@@ -1,49 +0,0 @@
-package adapters
-
-import (
-	"io"
-	"net"
-
-	C "github.com/Dreamacro/clash/constant"
-)
-
-// DirectAdapter is a directly connected adapter
-type DirectAdapter struct {
-	conn net.Conn
-}
-
-// ReadWriter is used to handle network traffic
-func (d *DirectAdapter) ReadWriter() io.ReadWriter {
-	return d.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 {
-	traffic *C.Traffic
-}
-
-func (d *Direct) Name() string {
-	return "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
-	}
-	c.(*net.TCPConn).SetKeepAlive(true)
-	return &DirectAdapter{conn: NewTrafficTrack(c, d.traffic)}, nil
-}
-
-func NewDirect(traffic *C.Traffic) *Direct {
-	return &Direct{traffic: traffic}
-}

adapters/inbound/http.go

@@ -0,0 +1,59 @@
+package adapters
+
+import (
+	"net"
+	"net/http"
+	"strings"
+
+	C "github.com/Dreamacro/clash/constant"
+)
+
+// HTTPAdapter is a adapter for HTTP connection
+type HTTPAdapter struct {
+	net.Conn
+	metadata *C.Metadata
+	R        *http.Request
+}
+
+// Metadata return destination metadata
+func (h *HTTPAdapter) Metadata() *C.Metadata {
+	return h.metadata
+}
+
+// NewHTTP is HTTPAdapter generator
+func NewHTTP(request *http.Request, conn net.Conn) *HTTPAdapter {
+	metadata := parseHTTPAddr(request)
+	if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {
+		metadata.SrcIP = ip
+		metadata.SrcPort = port
+	}
+	return &HTTPAdapter{
+		metadata: metadata,
+		R:        request,
+		Conn:     conn,
+	}
+}
+
+// RemoveHopByHopHeaders remove hop-by-hop header
+func RemoveHopByHopHeaders(header http.Header) {
+	// Strip hop-by-hop header based on RFC:
+	// http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.5.1
+	// https://www.mnot.net/blog/2011/07/11/what_proxies_must_do
+
+	header.Del("Proxy-Connection")
+	header.Del("Proxy-Authenticate")
+	header.Del("Proxy-Authorization")
+	header.Del("TE")
+	header.Del("Trailers")
+	header.Del("Transfer-Encoding")
+	header.Del("Upgrade")
+
+	connections := header.Get("Connection")
+	header.Del("Connection")
+	if len(connections) == 0 {
+		return
+	}
+	for _, h := range strings.Split(connections, ",") {
+		header.Del(strings.TrimSpace(h))
+	}
+}

adapters/inbound/https.go

@@ -0,0 +1,19 @@
+package adapters
+
+import (
+	"net"
+	"net/http"
+)
+
+// NewHTTPS is HTTPAdapter generator
+func NewHTTPS(request *http.Request, conn net.Conn) *SocketAdapter {
+	metadata := parseHTTPAddr(request)
+	if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {
+		metadata.SrcIP = ip
+		metadata.SrcPort = port
+	}
+	return &SocketAdapter{
+		metadata: metadata,
+		Conn:     conn,
+	}
+}

adapters/inbound/socket.go

@@ -0,0 +1,35 @@
+package adapters
+
+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 +1,72 @@
+package adapters
+
+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,
+		Type:     C.HTTP,
+		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/outbound/base.go

@@ -0,0 +1,207 @@
+package adapters
+
+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) Destroy() {}
+
+func (b *Base) MarshalJSON() ([]byte, error) {
+	return json.Marshal(map[string]string{
+		"type": b.Type().String(),
+	})
+}
+
+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()
+	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}
+}
+
+// ProxyGroupOption contain the common options for all kind of ProxyGroup
+type ProxyGroupOption struct {
+	Name    string   `proxy:"name"`
+	Proxies []string `proxy:"proxies"`
+}

adapters/outbound/direct.go

@@ -0,0 +1,49 @@
+package adapters
+
+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/fallback.go

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

adapters/outbound/http.go

@@ -0,0 +1,125 @@
+package adapters
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"crypto/tls"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"strconv"
+
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Http struct {
+	*Base
+	addr           string
+	user           string
+	pass           string
+	tls            bool
+	skipCertVerify bool
+	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.tls {
+		cc := tls.Client(c, h.tlsConfig)
+		err = cc.Handshake()
+		c = cc
+	}
+
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error", h.addr)
+	}
+	tcpKeepAlive(c)
+	if err := h.shakeHand(metadata, c); err != nil {
+		return nil, err
+	}
+
+	return newConn(c, h), nil
+}
+
+func (h *Http) shakeHand(metadata *C.Metadata, rw io.ReadWriter) error {
+	var buf bytes.Buffer
+	var err error
+
+	addr := metadata.RemoteAddress()
+	buf.WriteString("CONNECT " + addr + " HTTP/1.1\r\n")
+	buf.WriteString("Host: " + metadata.String() + "\r\n")
+	buf.WriteString("Proxy-Connection: Keep-Alive\r\n")
+
+	if h.user != "" && h.pass != "" {
+		auth := h.user + ":" + h.pass
+		buf.WriteString("Proxy-Authorization: Basic " + base64.StdEncoding.EncodeToString([]byte(auth)) + "\r\n")
+	}
+	// header ended
+	buf.WriteString("\r\n")
+
+	_, err = rw.Write(buf.Bytes())
+	if err != nil {
+		return err
+	}
+
+	var req http.Request
+	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,
+		tls:            option.TLS,
+		skipCertVerify: option.SkipCertVerify,
+		tlsConfig:      tlsConfig,
+	}
+}

adapters/outbound/loadbalance.go

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

adapters/outbound/reject.go

@@ -0,0 +1,55 @@
+package adapters
+
+import (
+	"context"
+	"io"
+	"net"
+	"time"
+
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Reject struct {
+	*Base
+}
+
+func (r *Reject) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	return newConn(&NopConn{}, r), nil
+}
+
+func NewReject() *Reject {
+	return &Reject{
+		Base: &Base{
+			name: "REJECT",
+			tp:   C.Reject,
+		},
+	}
+}
+
+type NopConn struct{}
+
+func (rw *NopConn) Read(b []byte) (int, error) {
+	return 0, io.EOF
+}
+
+func (rw *NopConn) Write(b []byte) (int, error) {
+	return 0, io.EOF
+}
+
+// Close is fake function for net.Conn
+func (rw *NopConn) Close() error { return nil }
+
+// LocalAddr is fake function for net.Conn
+func (rw *NopConn) LocalAddr() net.Addr { return nil }
+
+// RemoteAddr is fake function for net.Conn
+func (rw *NopConn) RemoteAddr() net.Addr { return nil }
+
+// SetDeadline is fake function for net.Conn
+func (rw *NopConn) SetDeadline(time.Time) error { return nil }
+
+// SetReadDeadline is fake function for net.Conn
+func (rw *NopConn) SetReadDeadline(time.Time) error { return nil }
+
+// SetWriteDeadline is fake function for net.Conn
+func (rw *NopConn) SetWriteDeadline(time.Time) error { return nil }

adapters/outbound/selector.go

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

adapters/outbound/shadowsocks.go

@@ -0,0 +1,208 @@
+package adapters
+
+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: %s", ss.server, err.Error())
+	}
+	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: %s", ss.server, err.Error())
+		}
+	}
+	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 error: %v:%v", 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: %s", server, err.Error())
+	}
+
+	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: %s", server, err.Error())
+		}
+
+		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: %s", server, err.Error())
+		}
+
+		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, a, e := uc.PacketConn.ReadFrom(b)
+	addr := socks5.SplitAddr(b[:n])
+	copy(b, b[len(addr):])
+	return n - len(addr), a, e
+}

adapters/outbound/snell.go

@@ -0,0 +1,72 @@
+package adapters
+
+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: %s", s.server, err.Error())
+	}
+	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: %s", server, err.Error())
+	}
+
+	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 adapters
+
+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", ss.addr)
+	}
+	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", ss.addr)
+		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("%v client hanshake error", err)
+		return
+	}
+
+	addr, err := net.ResolveUDPAddr("udp", bindAddr.String())
+	if err != nil {
+		return
+	}
+
+	targetAddr := socks5.ParseAddr(metadata.RemoteAddress())
+	if targetAddr == nil {
+		return nil, nil, fmt.Errorf("parse address error: %v:%v", metadata.String(), metadata.DstPort)
+	}
+
+	pc, err := net.ListenPacket("udp", "")
+	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/urltest.go

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

adapters/outbound/util.go

@@ -0,0 +1,180 @@
+package adapters
+
+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 == "" {
+		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.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
+	}
+
+	dialer := net.Dialer{}
+
+	returned := make(chan struct{})
+	defer close(returned)
+
+	type dialResult struct {
+		net.Conn
+		error
+		resolved bool
+		ipv6     bool
+		done     bool
+	}
+	results := make(chan dialResult)
+	var primary, fallback dialResult
+
+	startRacer := func(ctx context.Context, host string, ipv6 bool) {
+		result := dialResult{ipv6: ipv6, done: true}
+		defer func() {
+			select {
+			case results <- result:
+			case <-returned:
+				if result.Conn != nil {
+					result.Conn.Close()
+				}
+			}
+		}()
+
+		var ip net.IP
+		if ipv6 {
+			ip, result.error = dns.ResolveIPv6(host)
+		} else {
+			ip, result.error = dns.ResolveIPv4(host)
+		}
+		if result.error != nil {
+			return
+		}
+		result.resolved = true
+
+		if ipv6 {
+			result.Conn, result.error = dialer.DialContext(ctx, "tcp6", net.JoinHostPort(ip.String(), port))
+		} else {
+			result.Conn, result.error = dialer.DialContext(ctx, "tcp4", net.JoinHostPort(ip.String(), port))
+		}
+	}
+
+	go startRacer(ctx, host, false)
+	go startRacer(ctx, host, true)
+
+	for {
+		select {
+		case res := <-results:
+			if res.error == nil {
+				return res.Conn, nil
+			}
+
+			if !res.ipv6 {
+				primary = res
+			} else {
+				fallback = res
+			}
+
+			if primary.done && fallback.done {
+				if primary.resolved {
+					return nil, primary.error
+				} else if fallback.resolved {
+					return nil, fallback.error
+				} else {
+					return nil, primary.error
+				}
+			}
+		}
+	}
+}
+
+func resolveUDPAddr(network, address string) (*net.UDPAddr, error) {
+	host, port, err := net.SplitHostPort(address)
+	if err != nil {
+		return nil, err
+	}
+
+	ip, err := dns.ResolveIP(host)
+	if err != nil {
+		return nil, err
+	}
+	return net.ResolveUDPAddr(network, net.JoinHostPort(ip.String(), port))
+}

adapters/outbound/vmess.go

@@ -0,0 +1,129 @@
+package adapters
+
+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/reject.go

@@ -1,50 +0,0 @@
-package adapters
-
-import (
-	"io"
-	"net"
-
-	C "github.com/Dreamacro/clash/constant"
-)
-
-// RejectAdapter is a reject connected adapter
-type RejectAdapter struct {
-}
-
-// ReadWriter is used to handle network traffic
-func (r *RejectAdapter) ReadWriter() io.ReadWriter {
-	return &NopRW{}
-}
-
-// Close is used to close connection
-func (r *RejectAdapter) Close() {}
-
-// Conn is used to http request
-func (r *RejectAdapter) Conn() net.Conn {
-	return nil
-}
-
-type Reject struct {
-}
-
-func (r *Reject) Name() string {
-	return "Reject"
-}
-
-func (r *Reject) Generator(addr *C.Addr) (adapter C.ProxyAdapter, err error) {
-	return &RejectAdapter{}, nil
-}
-
-func NewReject() *Reject {
-	return &Reject{}
-}
-
-type NopRW struct{}
-
-func (rw *NopRW) Read(b []byte) (int, error) {
-	return len(b), nil
-}
-
-func (rw *NopRW) Write(b []byte) (int, error) {
-	return 0, io.EOF
-}

adapters/shadowsocks.go

@@ -1,105 +0,0 @@
-package adapters
-
-import (
-	"bytes"
-	"fmt"
-	"io"
-	"net"
-	"net/url"
-	"strconv"
-
-	C "github.com/Dreamacro/clash/constant"
-
-	"github.com/riobard/go-shadowsocks2/core"
-	"github.com/riobard/go-shadowsocks2/socks"
-)
-
-// ShadowsocksAdapter is a shadowsocks adapter
-type ShadowsocksAdapter struct {
-	conn net.Conn
-}
-
-// ReadWriter is used to handle network traffic
-func (ss *ShadowsocksAdapter) ReadWriter() io.ReadWriter {
-	return ss.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
-	cipher  core.Cipher
-	traffic *C.Traffic
-}
-
-func (ss *ShadowSocks) Name() string {
-	return ss.name
-}
-
-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)
-	}
-	c.(*net.TCPConn).SetKeepAlive(true)
-	c = ss.cipher.StreamConn(c)
-	_, err = c.Write(serializesSocksAddr(addr))
-	return &ShadowsocksAdapter{conn: NewTrafficTrack(c, ss.traffic)}, err
-}
-
-func NewShadowSocks(name string, ssURL string, traffic *C.Traffic) (*ShadowSocks, error) {
-	var key []byte
-	server, cipher, password, _ := parseURL(ssURL)
-	ciph, err := core.PickCipher(cipher, key, password)
-	if err != nil {
-		return nil, fmt.Errorf("ss %s initialize error: %s", server, err.Error())
-	}
-	return &ShadowSocks{
-		server:  server,
-		name:    name,
-		cipher:  ciph,
-		traffic: traffic,
-	}, 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{[]byte{aType, len}, host, port}
-	case socks.AtypIPv4:
-		host := addr.IP.To4()
-		buf = [][]byte{[]byte{aType}, host, port}
-	case socks.AtypIPv6:
-		host := addr.IP.To16()
-		buf = [][]byte{[]byte{aType}, host, port}
-	}
-	return bytes.Join(buf, []byte(""))
-}

adapters/urltest.go

@@ -1,148 +0,0 @@
-package adapters
-
-import (
-	"fmt"
-	"net"
-	"net/http"
-	"net/url"
-	"sync"
-	"time"
-
-	C "github.com/Dreamacro/clash/constant"
-)
-
-type URLTest struct {
-	name   string
-	proxys []C.Proxy
-	url    *url.URL
-	rawURL string
-	addr   *C.Addr
-	fast   C.Proxy
-	delay  time.Duration
-}
-
-func (u *URLTest) Name() string {
-	return u.name
-}
-
-func (u *URLTest) Generator(addr *C.Addr) (adapter C.ProxyAdapter, err error) {
-	return u.fast.Generator(addr)
-}
-
-func (u *URLTest) loop() {
-	tick := time.Tick(u.delay)
-	go u.speedTest()
-	for range tick {
-		go u.speedTest()
-	}
-}
-
-func (u *URLTest) speedTest() {
-	wg := sync.WaitGroup{}
-	wg.Add(len(u.proxys))
-	c := make(chan interface{})
-	fast := selectFast(c)
-	timer := time.NewTimer(u.delay)
-
-	for _, p := range u.proxys {
-		go func(p C.Proxy) {
-			err := getUrl(p, u.addr, 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 getUrl(proxy C.Proxy, addr *C.Addr, rawURL string) (err error) {
-	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(rawURL)
-	if err != nil {
-		return
-	}
-	req.Body.Close()
-	return nil
-}
-
-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 NewURLTest(name string, proxys []C.Proxy, rawURL string, delay time.Duration) (*URLTest, error) {
-	u, err := url.Parse(rawURL)
-	if err != nil {
-		return nil, err
-	}
-
-	port := u.Port()
-	if port == "" {
-		if u.Scheme == "https" {
-			port = "443"
-		} else if u.Scheme == "http" {
-			port = "80"
-		} else {
-			return nil, fmt.Errorf("%s scheme not Support", rawURL)
-		}
-	}
-
-	addr := &C.Addr{
-		AddrType: C.AtypDomainName,
-		Host:     u.Hostname(),
-		IP:       nil,
-		Port:     port,
-	}
-
-	urlTest := &URLTest{
-		name:   name,
-		proxys: proxys[:],
-		rawURL: rawURL,
-		url:    u,
-		addr:   addr,
-		fast:   proxys[0],
-		delay:  delay,
-	}
-	go urlTest.loop()
-	return urlTest, nil
-}

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 +1,157 @@
+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)
+
+// 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
+}
+
+// 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)
+}
+
+type entry struct {
+	key     interface{}
+	value   interface{}
+	expires int64
+}

common/cache/lrucache_test.go

@@ -0,0 +1,117 @@
+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)
+}

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/iterable.go

@@ -0,0 +1,3 @@
+package observable
+
+type Iterable <-chan interface{}

common/observable/observable.go

@@ -50,7 +50,6 @@ func (o *Observable) Subscribe() (Subscription, error) {
 func (o *Observable) UnSubscribe(sub Subscription) {
 	elm, exist := o.listener.Load(sub)
 	if !exist {
-		println("not exist")
 		return
 	}
 	subscriber := elm.(*Subscriber)

common/observable/observable_test.go

@@ -27,11 +27,7 @@ func TestObservable(t *testing.T) {
 		t.Error(err)
 	}
 	count := 0
-	for {
-		_, open := <-data
-		if !open {
-			break
-		}
+	for range data {
 		count = count + 1
 	}
 	if count != 5 {
@@ -49,11 +45,7 @@ func TestObservable_MutilSubscribe(t *testing.T) {
 	var wg sync.WaitGroup
 	wg.Add(2)
 	waitCh := func(ch <-chan interface{}) {
-		for {
-			_, open := <-ch
-			if !open {
-				break
-			}
+		for range ch {
 			count = count + 1
 		}
 		wg.Done()
@@ -80,6 +72,25 @@ func TestObservable_UnSubscribe(t *testing.T) {
 	}
 }
 
+func TestObservable_SubscribeClosedSource(t *testing.T) {
+	iter := iterator([]interface{}{1})
+	src := NewObservable(iter)
+	data, _ := src.Subscribe()
+	<-data
+
+	_, closed := src.Subscribe()
+	if closed == nil {
+		t.Error("Observable should be closed")
+	}
+}
+
+func TestObservable_UnSubscribeWithNotExistSubscription(t *testing.T) {
+	sub := Subscription(make(chan interface{}))
+	iter := iterator([]interface{}{1})
+	src := NewObservable(iter)
+	src.UnSubscribe(sub)
+}
+
 func TestObservable_SubscribeGoroutineLeak(t *testing.T) {
 	// waiting for other goroutine recycle
 	time.Sleep(120 * time.Millisecond)
@@ -97,11 +108,7 @@ func TestObservable_SubscribeGoroutineLeak(t *testing.T) {
 	var wg sync.WaitGroup
 	wg.Add(max)
 	waitCh := func(ch <-chan interface{}) {
-		for {
-			_, open := <-ch
-			if !open {
-				break
-			}
+		for range ch {
 		}
 		wg.Done()
 	}

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/structure/structure.go

@@ -0,0 +1,239 @@
+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)
+	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) 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)
+	}
+}

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 +1,117 @@
+package fakeip
+
+import (
+	"errors"
+	"net"
+	"sync"
+
+	"github.com/Dreamacro/clash/common/cache"
+)
+
+// Pool is a implementation about fake ip generator without storage
+type Pool struct {
+	max     uint32
+	min     uint32
+	gateway uint32
+	offset  uint32
+	mux     *sync.Mutex
+	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
+}
+
+// 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) (*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,
+		mux:     &sync.Mutex{},
+		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)
+
+	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)
+
+	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)
+
+	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)
+
+	// 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)
+
+	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

@@ -0,0 +1,90 @@
+package obfs
+
+import (
+	"bytes"
+	"encoding/base64"
+	"fmt"
+	"io"
+	"math/rand"
+	"net"
+	"net/http"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+// HTTPObfs is shadowsocks http simple-obfs implementation
+type HTTPObfs struct {
+	net.Conn
+	host          string
+	port          string
+	buf           []byte
+	offset        int
+	firstRequest  bool
+	firstResponse bool
+}
+
+func (ho *HTTPObfs) Read(b []byte) (int, error) {
+	if ho.buf != nil {
+		n := copy(b, ho.buf[ho.offset:])
+		ho.offset += n
+		if ho.offset == len(ho.buf) {
+			ho.buf = nil
+		}
+		return n, nil
+	}
+
+	if ho.firstResponse {
+		buf := pool.BufPool.Get().([]byte)
+		n, err := ho.Conn.Read(buf)
+		if err != nil {
+			pool.BufPool.Put(buf[:cap(buf)])
+			return 0, err
+		}
+		idx := bytes.Index(buf[:n], []byte("\r\n\r\n"))
+		if idx == -1 {
+			pool.BufPool.Put(buf[:cap(buf)])
+			return 0, io.EOF
+		}
+		ho.firstResponse = false
+		length := n - (idx + 4)
+		n = copy(b, buf[idx+4:n])
+		if length > n {
+			ho.buf = buf[:idx+4+length]
+			ho.offset = idx + 4 + n
+		} else {
+			pool.BufPool.Put(buf[:cap(buf)])
+		}
+		return n, nil
+	}
+	return ho.Conn.Read(b)
+}
+
+func (ho *HTTPObfs) Write(b []byte) (int, error) {
+	if ho.firstRequest {
+		randBytes := make([]byte, 16)
+		rand.Read(randBytes)
+		req, _ := http.NewRequest("GET", fmt.Sprintf("http://%s/", ho.host), bytes.NewBuffer(b[:]))
+		req.Header.Set("User-Agent", fmt.Sprintf("curl/7.%d.%d", rand.Int()%54, rand.Int()%2))
+		req.Header.Set("Upgrade", "websocket")
+		req.Header.Set("Connection", "Upgrade")
+		req.Host = fmt.Sprintf("%s:%s", ho.host, ho.port)
+		req.Header.Set("Sec-WebSocket-Key", base64.URLEncoding.EncodeToString(randBytes))
+		req.ContentLength = int64(len(b))
+		err := req.Write(ho.Conn)
+		ho.firstRequest = false
+		return len(b), err
+	}
+
+	return ho.Conn.Write(b)
+}
+
+// NewHTTPObfs return a HTTPObfs
+func NewHTTPObfs(conn net.Conn, host string, port string) net.Conn {
+	return &HTTPObfs{
+		Conn:          conn,
+		firstRequest:  true,
+		firstResponse: true,
+		host:          host,
+		port:          port,
+	}
+}

component/simple-obfs/tls.go

@@ -0,0 +1,202 @@
+package obfs
+
+import (
+	"bytes"
+	"encoding/binary"
+	"io"
+	"math/rand"
+	"net"
+	"time"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+func init() {
+	rand.Seed(time.Now().Unix())
+}
+
+const (
+	chunkSize = 1 << 14 // 2 ** 14 == 16 * 1024
+)
+
+// TLSObfs is shadowsocks tls simple-obfs implementation
+type TLSObfs struct {
+	net.Conn
+	server        string
+	remain        int
+	firstRequest  bool
+	firstResponse bool
+}
+
+func (to *TLSObfs) read(b []byte, discardN int) (int, error) {
+	buf := pool.BufPool.Get().([]byte)
+	_, err := io.ReadFull(to.Conn, buf[:discardN])
+	if err != nil {
+		return 0, err
+	}
+	pool.BufPool.Put(buf[:cap(buf)])
+
+	sizeBuf := make([]byte, 2)
+	_, err = io.ReadFull(to.Conn, sizeBuf)
+	if err != nil {
+		return 0, nil
+	}
+
+	length := int(binary.BigEndian.Uint16(sizeBuf))
+	if length > len(b) {
+		n, err := to.Conn.Read(b)
+		if err != nil {
+			return n, err
+		}
+		to.remain = length - n
+		return n, nil
+	}
+
+	return io.ReadFull(to.Conn, b[:length])
+}
+
+func (to *TLSObfs) Read(b []byte) (int, error) {
+	if to.remain > 0 {
+		length := to.remain
+		if length > len(b) {
+			length = len(b)
+		}
+
+		n, err := io.ReadFull(to.Conn, b[:length])
+		to.remain -= n
+		return n, err
+	}
+
+	if to.firstResponse {
+		// type + ver + lensize + 91 = 96
+		// type + ver + lensize + 1 = 6
+		// type + ver = 3
+		to.firstResponse = false
+		return to.read(b, 105)
+	}
+
+	// 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)
+		to.firstRequest = false
+		return len(b), err
+	}
+
+	size := pool.BufPool.Get().([]byte)
+	binary.BigEndian.PutUint16(size[:2], uint16(len(b)))
+
+	buf := &bytes.Buffer{}
+	buf.Write([]byte{0x17, 0x03, 0x03})
+	buf.Write(size[:2])
+	buf.Write(b)
+	_, err := to.Conn.Write(buf.Bytes())
+	pool.BufPool.Put(size[:cap(size)])
+	return len(b), err
+}
+
+// NewTLSObfs return a SimpleObfs
+func NewTLSObfs(conn net.Conn, server string) net.Conn {
+	return &TLSObfs{
+		Conn:          conn,
+		server:        server,
+		firstRequest:  true,
+		firstResponse: true,
+	}
+}
+
+func makeClientHelloMsg(data []byte, server string) []byte {
+	random := make([]byte, 28)
+	sessionID := make([]byte, 32)
+	rand.Read(random)
+	rand.Read(sessionID)
+
+	buf := &bytes.Buffer{}
+
+	// handshake, TLS 1.0 version, length
+	buf.WriteByte(22)
+	buf.Write([]byte{0x03, 0x01})
+	length := uint16(212 + len(data) + len(server))
+	buf.WriteByte(byte(length >> 8))
+	buf.WriteByte(byte(length & 0xff))
+
+	// clientHello, length, TLS 1.2 version
+	buf.WriteByte(1)
+	buf.WriteByte(0)
+	binary.Write(buf, binary.BigEndian, uint16(208+len(data)+len(server)))
+	buf.Write([]byte{0x03, 0x03})
+
+	// random with timestamp, sid len, sid
+	binary.Write(buf, binary.BigEndian, uint32(time.Now().Unix()))
+	buf.Write(random)
+	buf.WriteByte(32)
+	buf.Write(sessionID)
+
+	// cipher suites
+	buf.Write([]byte{0x00, 0x38})
+	buf.Write([]byte{
+		0xc0, 0x2c, 0xc0, 0x30, 0x00, 0x9f, 0xcc, 0xa9, 0xcc, 0xa8, 0xcc, 0xaa, 0xc0, 0x2b, 0xc0, 0x2f,
+		0x00, 0x9e, 0xc0, 0x24, 0xc0, 0x28, 0x00, 0x6b, 0xc0, 0x23, 0xc0, 0x27, 0x00, 0x67, 0xc0, 0x0a,
+		0xc0, 0x14, 0x00, 0x39, 0xc0, 0x09, 0xc0, 0x13, 0x00, 0x33, 0x00, 0x9d, 0x00, 0x9c, 0x00, 0x3d,
+		0x00, 0x3c, 0x00, 0x35, 0x00, 0x2f, 0x00, 0xff,
+	})
+
+	// compression
+	buf.Write([]byte{0x01, 0x00})
+
+	// extension length
+	binary.Write(buf, binary.BigEndian, uint16(79+len(data)+len(server)))
+
+	// session ticket
+	buf.Write([]byte{0x00, 0x23})
+	binary.Write(buf, binary.BigEndian, uint16(len(data)))
+	buf.Write(data)
+
+	// server name
+	buf.Write([]byte{0x00, 0x00})
+	binary.Write(buf, binary.BigEndian, uint16(len(server)+5))
+	binary.Write(buf, binary.BigEndian, uint16(len(server)+3))
+	buf.WriteByte(0)
+	binary.Write(buf, binary.BigEndian, uint16(len(server)))
+	buf.Write([]byte(server))
+
+	// ec_point
+	buf.Write([]byte{0x00, 0x0b, 0x00, 0x04, 0x03, 0x01, 0x00, 0x02})
+
+	// groups
+	buf.Write([]byte{0x00, 0x0a, 0x00, 0x0a, 0x00, 0x08, 0x00, 0x1d, 0x00, 0x17, 0x00, 0x19, 0x00, 0x18})
+
+	// signature
+	buf.Write([]byte{
+		0x00, 0x0d, 0x00, 0x20, 0x00, 0x1e, 0x06, 0x01, 0x06, 0x02, 0x06, 0x03, 0x05,
+		0x01, 0x05, 0x02, 0x05, 0x03, 0x04, 0x01, 0x04, 0x02, 0x04, 0x03, 0x03, 0x01,
+		0x03, 0x02, 0x03, 0x03, 0x02, 0x01, 0x02, 0x02, 0x02, 0x03,
+	})
+
+	// encrypt then mac
+	buf.Write([]byte{0x00, 0x16, 0x00, 0x00})
+
+	// extended master secret
+	buf.Write([]byte{0x00, 0x17, 0x00, 0x00})
+
+	return buf.Bytes()
+}

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 +1,375 @@
+package socks5
+
+import (
+	"bytes"
+	"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)
+}
+
+// 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
+}
+
+// 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 = 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

@@ -0,0 +1,117 @@
+package vmess
+
+import (
+	"crypto/cipher"
+	"encoding/binary"
+	"errors"
+	"io"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+type aeadWriter struct {
+	io.Writer
+	cipher.AEAD
+	nonce [32]byte
+	count uint16
+	iv    []byte
+}
+
+func newAEADWriter(w io.Writer, aead cipher.AEAD, iv []byte) *aeadWriter {
+	return &aeadWriter{Writer: w, AEAD: aead, iv: iv}
+}
+
+func (w *aeadWriter) Write(b []byte) (n int, err error) {
+	buf := pool.BufPool.Get().([]byte)
+	defer pool.BufPool.Put(buf[:cap(buf)])
+	length := len(b)
+	for {
+		if length == 0 {
+			break
+		}
+		readLen := chunkSize - w.Overhead()
+		if length < readLen {
+			readLen = length
+		}
+		payloadBuf := buf[lenSize : lenSize+chunkSize-w.Overhead()]
+		copy(payloadBuf, b[n:n+readLen])
+
+		binary.BigEndian.PutUint16(buf[:lenSize], uint16(readLen+w.Overhead()))
+		binary.BigEndian.PutUint16(w.nonce[:2], w.count)
+		copy(w.nonce[2:], w.iv[2:12])
+
+		w.Seal(payloadBuf[:0], w.nonce[:w.NonceSize()], payloadBuf[:readLen], nil)
+		w.count++
+
+		_, err = w.Writer.Write(buf[:lenSize+readLen+w.Overhead()])
+		if err != nil {
+			break
+		}
+		n += readLen
+		length -= readLen
+	}
+	return
+}
+
+type aeadReader struct {
+	io.Reader
+	cipher.AEAD
+	nonce   [32]byte
+	buf     []byte
+	offset  int
+	iv      []byte
+	sizeBuf []byte
+	count   uint16
+}
+
+func newAEADReader(r io.Reader, aead cipher.AEAD, iv []byte) *aeadReader {
+	return &aeadReader{Reader: r, AEAD: aead, iv: iv, sizeBuf: make([]byte, lenSize)}
+}
+
+func (r *aeadReader) Read(b []byte) (int, error) {
+	if r.buf != nil {
+		n := copy(b, r.buf[r.offset:])
+		r.offset += n
+		if r.offset == len(r.buf) {
+			pool.BufPool.Put(r.buf[:cap(r.buf)])
+			r.buf = nil
+		}
+		return n, nil
+	}
+
+	_, err := io.ReadFull(r.Reader, r.sizeBuf)
+	if err != nil {
+		return 0, err
+	}
+
+	size := int(binary.BigEndian.Uint16(r.sizeBuf))
+	if size > maxSize {
+		return 0, errors.New("Buffer is larger than standard")
+	}
+
+	buf := pool.BufPool.Get().([]byte)
+	_, err = io.ReadFull(r.Reader, buf[:size])
+	if err != nil {
+		pool.BufPool.Put(buf[:cap(buf)])
+		return 0, err
+	}
+
+	binary.BigEndian.PutUint16(r.nonce[:2], r.count)
+	copy(r.nonce[2:], r.iv[2:12])
+
+	_, err = r.Open(buf[:0], r.nonce[:r.NonceSize()], buf[:size], nil)
+	r.count++
+	if err != nil {
+		return 0, err
+	}
+	realLen := size - r.Overhead()
+	n := copy(b, buf[:realLen])
+	if len(b) >= realLen {
+		pool.BufPool.Put(buf[:cap(buf)])
+		return n, nil
+	}
+
+	r.offset = n
+	r.buf = buf[:realLen]
+	return n, nil
+}

component/vmess/chunk.go

@@ -0,0 +1,102 @@
+package vmess
+
+import (
+	"encoding/binary"
+	"errors"
+	"io"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+const (
+	lenSize   = 2
+	chunkSize = 1 << 14   // 2 ** 14 == 16 * 1024
+	maxSize   = 17 * 1024 // 2 + chunkSize + aead.Overhead()
+)
+
+type chunkReader struct {
+	io.Reader
+	buf     []byte
+	sizeBuf []byte
+	offset  int
+}
+
+func newChunkReader(reader io.Reader) *chunkReader {
+	return &chunkReader{Reader: reader, sizeBuf: make([]byte, lenSize)}
+}
+
+func newChunkWriter(writer io.WriteCloser) *chunkWriter {
+	return &chunkWriter{Writer: writer}
+}
+
+func (cr *chunkReader) Read(b []byte) (int, error) {
+	if cr.buf != nil {
+		n := copy(b, cr.buf[cr.offset:])
+		cr.offset += n
+		if cr.offset == len(cr.buf) {
+			pool.BufPool.Put(cr.buf[:cap(cr.buf)])
+			cr.buf = nil
+		}
+		return n, nil
+	}
+
+	_, err := io.ReadFull(cr.Reader, cr.sizeBuf)
+	if err != nil {
+		return 0, err
+	}
+
+	size := int(binary.BigEndian.Uint16(cr.sizeBuf))
+	if size > maxSize {
+		return 0, errors.New("Buffer is larger than standard")
+	}
+
+	if len(b) >= size {
+		_, err := io.ReadFull(cr.Reader, b[:size])
+		if err != nil {
+			return 0, err
+		}
+
+		return size, nil
+	}
+
+	buf := pool.BufPool.Get().([]byte)
+	_, err = io.ReadFull(cr.Reader, buf[:size])
+	if err != nil {
+		pool.BufPool.Put(buf[:cap(buf)])
+		return 0, err
+	}
+	n := copy(b, cr.buf[:])
+	cr.offset = n
+	cr.buf = buf[:size]
+	return n, nil
+}
+
+type chunkWriter struct {
+	io.Writer
+}
+
+func (cw *chunkWriter) Write(b []byte) (n int, err error) {
+	buf := pool.BufPool.Get().([]byte)
+	defer pool.BufPool.Put(buf[:cap(buf)])
+	length := len(b)
+	for {
+		if length == 0 {
+			break
+		}
+		readLen := chunkSize
+		if length < chunkSize {
+			readLen = length
+		}
+		payloadBuf := buf[lenSize : lenSize+chunkSize]
+		copy(payloadBuf, b[n:n+readLen])
+
+		binary.BigEndian.PutUint16(buf[:lenSize], uint16(readLen))
+		_, err = cw.Writer.Write(buf[:lenSize+readLen])
+		if err != nil {
+			break
+		}
+		n += readLen
+		length -= readLen
+	}
+	return
+}

component/vmess/conn.go

@@ -0,0 +1,210 @@
+package vmess
+
+import (
+	"bytes"
+	"crypto/aes"
+	"crypto/cipher"
+	"crypto/hmac"
+	"crypto/md5"
+	"encoding/binary"
+	"errors"
+	"hash/fnv"
+	"io"
+	"math/rand"
+	"net"
+	"time"
+
+	"golang.org/x/crypto/chacha20poly1305"
+)
+
+func init() {
+	rand.Seed(time.Now().UnixNano())
+}
+
+// Conn wrapper a net.Conn with vmess protocol
+type Conn struct {
+	net.Conn
+	reader      io.Reader
+	writer      io.Writer
+	dst         *DstAddr
+	id          *ID
+	reqBodyIV   []byte
+	reqBodyKey  []byte
+	respBodyIV  []byte
+	respBodyKey []byte
+	respV       byte
+	security    byte
+
+	received bool
+}
+
+func (vc *Conn) Write(b []byte) (int, error) {
+	return vc.writer.Write(b)
+}
+
+func (vc *Conn) Read(b []byte) (int, error) {
+	if vc.received {
+		return vc.reader.Read(b)
+	}
+
+	if err := vc.recvResponse(); err != nil {
+		return 0, err
+	}
+	vc.received = true
+	return vc.reader.Read(b)
+}
+
+func (vc *Conn) sendRequest() error {
+	timestamp := time.Now()
+
+	h := hmac.New(md5.New, vc.id.UUID.Bytes())
+	binary.Write(h, binary.BigEndian, uint64(timestamp.Unix()))
+	_, err := vc.Conn.Write(h.Sum(nil))
+	if err != nil {
+		return err
+	}
+
+	buf := &bytes.Buffer{}
+
+	// Ver IV Key V Opt
+	buf.WriteByte(Version)
+	buf.Write(vc.reqBodyIV[:])
+	buf.Write(vc.reqBodyKey[:])
+	buf.WriteByte(vc.respV)
+	buf.WriteByte(OptionChunkStream)
+
+	p := rand.Intn(16)
+	// P Sec Reserve Cmd
+	buf.WriteByte(byte(p<<4) | byte(vc.security))
+	buf.WriteByte(0)
+	if vc.dst.UDP {
+		buf.WriteByte(CommandUDP)
+	} else {
+		buf.WriteByte(CommandTCP)
+	}
+
+	// Port AddrType Addr
+	binary.Write(buf, binary.BigEndian, uint16(vc.dst.Port))
+	buf.WriteByte(vc.dst.AddrType)
+	buf.Write(vc.dst.Addr)
+
+	// padding
+	if p > 0 {
+		padding := make([]byte, p)
+		rand.Read(padding)
+		buf.Write(padding)
+	}
+
+	fnv1a := fnv.New32a()
+	fnv1a.Write(buf.Bytes())
+	buf.Write(fnv1a.Sum(nil))
+
+	block, err := aes.NewCipher(vc.id.CmdKey)
+	if err != nil {
+		return err
+	}
+
+	stream := cipher.NewCFBEncrypter(block, hashTimestamp(timestamp))
+	stream.XORKeyStream(buf.Bytes(), buf.Bytes())
+	_, err = vc.Conn.Write(buf.Bytes())
+	return err
+}
+
+func (vc *Conn) recvResponse() error {
+	block, err := aes.NewCipher(vc.respBodyKey[:])
+	if err != nil {
+		return err
+	}
+
+	stream := cipher.NewCFBDecrypter(block, vc.respBodyIV[:])
+	buf := make([]byte, 4)
+	_, err = io.ReadFull(vc.Conn, buf)
+	if err != nil {
+		return err
+	}
+	stream.XORKeyStream(buf, buf)
+
+	if buf[0] != vc.respV {
+		return errors.New("unexpected response header")
+	}
+
+	if buf[2] != 0 {
+		return errors.New("dynamic port is not supported now")
+	}
+
+	return nil
+}
+
+func hashTimestamp(t time.Time) []byte {
+	md5hash := md5.New()
+	ts := make([]byte, 8)
+	binary.BigEndian.PutUint64(ts, uint64(t.Unix()))
+	md5hash.Write(ts)
+	md5hash.Write(ts)
+	md5hash.Write(ts)
+	md5hash.Write(ts)
+	return md5hash.Sum(nil)
+}
+
+// newConn return a Conn instance
+func newConn(conn net.Conn, id *ID, dst *DstAddr, security Security) (*Conn, error) {
+	randBytes := make([]byte, 33)
+	rand.Read(randBytes)
+	reqBodyIV := make([]byte, 16)
+	reqBodyKey := make([]byte, 16)
+	copy(reqBodyIV[:], randBytes[:16])
+	copy(reqBodyKey[:], randBytes[16:32])
+	respV := randBytes[32]
+
+	respBodyKey := md5.Sum(reqBodyKey[:])
+	respBodyIV := md5.Sum(reqBodyIV[:])
+
+	var writer io.Writer
+	var reader io.Reader
+	switch security {
+	case SecurityNone:
+		reader = newChunkReader(conn)
+		writer = newChunkWriter(conn)
+	case SecurityAES128GCM:
+		block, _ := aes.NewCipher(reqBodyKey[:])
+		aead, _ := cipher.NewGCM(block)
+		writer = newAEADWriter(conn, aead, reqBodyIV[:])
+
+		block, _ = aes.NewCipher(respBodyKey[:])
+		aead, _ = cipher.NewGCM(block)
+		reader = newAEADReader(conn, aead, respBodyIV[:])
+	case SecurityCHACHA20POLY1305:
+		key := make([]byte, 32)
+		t := md5.Sum(reqBodyKey[:])
+		copy(key, t[:])
+		t = md5.Sum(key[:16])
+		copy(key[16:], t[:])
+		aead, _ := chacha20poly1305.New(key)
+		writer = newAEADWriter(conn, aead, reqBodyIV[:])
+
+		t = md5.Sum(respBodyKey[:])
+		copy(key, t[:])
+		t = md5.Sum(key[:16])
+		copy(key[16:], t[:])
+		aead, _ = chacha20poly1305.New(key)
+		reader = newAEADReader(conn, aead, respBodyIV[:])
+	}
+
+	c := &Conn{
+		Conn:        conn,
+		id:          id,
+		dst:         dst,
+		reqBodyIV:   reqBodyIV,
+		reqBodyKey:  reqBodyKey,
+		respV:       respV,
+		respBodyIV:  respBodyIV[:],
+		respBodyKey: respBodyKey[:],
+		reader:      reader,
+		writer:      writer,
+		security:    security,
+	}
+	if err := c.sendRequest(); err != nil {
+		return nil, err
+	}
+	return c, nil
+}

component/vmess/user.go

@@ -0,0 +1,55 @@
+package vmess
+
+import (
+	"bytes"
+	"crypto/md5"
+
+	"github.com/gofrs/uuid"
+)
+
+// ID cmdKey length
+const (
+	IDBytesLen = 16
+)
+
+// The ID of en entity, in the form of a UUID.
+type ID struct {
+	UUID   *uuid.UUID
+	CmdKey []byte
+}
+
+// newID returns an ID with given UUID.
+func newID(uuid *uuid.UUID) *ID {
+	id := &ID{UUID: uuid, CmdKey: make([]byte, IDBytesLen)}
+	md5hash := md5.New()
+	md5hash.Write(uuid.Bytes())
+	md5hash.Write([]byte("c48619fe-8f02-49e0-b9e9-edf763e17e21"))
+	md5hash.Sum(id.CmdKey[:0])
+	return id
+}
+
+func nextID(u *uuid.UUID) *uuid.UUID {
+	md5hash := md5.New()
+	md5hash.Write(u.Bytes())
+	md5hash.Write([]byte("16167dc8-16b6-4e6d-b8bb-65dd68113a81"))
+	var newid uuid.UUID
+	for {
+		md5hash.Sum(newid[:0])
+		if !bytes.Equal(newid.Bytes(), u.Bytes()) {
+			return &newid
+		}
+		md5hash.Write([]byte("533eff8a-4113-4b10-b5ce-0f5d76b98cd2"))
+	}
+}
+
+func newAlterIDs(primary *ID, alterIDCount uint16) []*ID {
+	alterIDs := make([]*ID, alterIDCount)
+	prevID := primary.UUID
+	for idx := range alterIDs {
+		newid := nextID(prevID)
+		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 +1,152 @@
+package vmess
+
+import (
+	"crypto/tls"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"net/url"
+	"strings"
+	"time"
+
+	"github.com/gorilla/websocket"
+)
+
+type websocketConn struct {
+	conn       *websocket.Conn
+	reader     io.Reader
+	remoteAddr net.Addr
+}
+
+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) {
+	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) {
+	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

@@ -0,0 +1,639 @@
+package config
+
+import (
+	"fmt"
+	"io/ioutil"
+	"net"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+
+	adapters "github.com/Dreamacro/clash/adapters/outbound"
+	"github.com/Dreamacro/clash/common/structure"
+	"github.com/Dreamacro/clash/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/dns"
+	"github.com/Dreamacro/clash/log"
+	R "github.com/Dreamacro/clash/rules"
+	T "github.com/Dreamacro/clash/tunnel"
+
+	yaml "gopkg.in/yaml.v2"
+)
+
+// General config
+type General struct {
+	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:"-"`
+}
+
+// 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
+	DNS          *DNS
+	Experimental *Experimental
+	Hosts        *trie.Trie
+	Rules        []C.Rule
+	Users        []auth.AuthUser
+	Proxies      map[string]C.Proxy
+}
+
+type rawDNS struct {
+	Enable         bool              `yaml:"enable"`
+	IPv6           bool              `yaml:"ipv6"`
+	NameServer     []string          `yaml:"nameserver"`
+	Fallback       []string          `yaml:"fallback"`
+	FallbackFilter rawFallbackFilter `yaml:"fallback-filter"`
+	Listen         string            `yaml:"listen"`
+	EnhancedMode   dns.EnhancedMode  `yaml:"enhanced-mode"`
+	FakeIPRange    string            `yaml:"fake-ip-range"`
+}
+
+type rawFallbackFilter struct {
+	GeoIP  bool     `yaml:"geoip"`
+	IPCIDR []string `yaml:"ipcidr"`
+}
+
+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"`
+
+	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"`
+}
+
+// forward compatibility before 1.0
+func readRawConfig(path string) ([]byte, error) {
+	data, err := ioutil.ReadFile(path)
+	if err == nil && len(data) != 0 {
+		return data, nil
+	}
+
+	if filepath.Ext(path) != ".yaml" {
+		return nil, err
+	}
+
+	path = path[:len(path)-5] + ".yml"
+	if _, err = os.Stat(path); err == nil {
+		return ioutil.ReadFile(path)
+	}
+
+	return data, nil
+}
+
+func readConfig(path string) (*rawConfig, error) {
+	if _, err := os.Stat(path); os.IsNotExist(err) {
+		return nil, err
+	}
+	data, err := readRawConfig(path)
+	if err != nil {
+		return nil, err
+	}
+
+	if len(data) == 0 {
+		return nil, fmt.Errorf("Configuration file %s is empty", path)
+	}
+
+	// config with some default value
+	rawConfig := &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{},
+			},
+		},
+	}
+	err = yaml.Unmarshal([]byte(data), &rawConfig)
+	return rawConfig, err
+}
+
+// Parse config
+func Parse(path string) (*Config, error) {
+	config := &Config{}
+
+	rawCfg, err := readConfig(path)
+	if err != nil {
+		return nil, err
+	}
+	config.Experimental = &rawCfg.Experimental
+
+	general, err := parseGeneral(rawCfg)
+	if err != nil {
+		return nil, err
+	}
+	config.General = general
+
+	proxies, err := parseProxies(rawCfg)
+	if err != nil {
+		return nil, err
+	}
+	config.Proxies = proxies
+
+	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 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
+
+	if externalUI != "" {
+		if !filepath.IsAbs(externalUI) {
+			externalUI = filepath.Join(C.Path.HomeDir(), externalUI)
+		}
+
+		if _, err := os.Stat(externalUI); os.IsNotExist(err) {
+			return nil, fmt.Errorf("external-ui: %s not exist", externalUI)
+		}
+	}
+
+	general := &General{
+		Port:               port,
+		SocksPort:          socksPort,
+		RedirPort:          redirPort,
+		AllowLan:           allowLan,
+		BindAddress:        bindAddress,
+		Mode:               mode,
+		LogLevel:           logLevel,
+		ExternalController: externalController,
+		ExternalUI:         externalUI,
+		Secret:             secret,
+	}
+	return general, nil
+}
+
+func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
+	proxies := make(map[string]C.Proxy)
+	proxyList := []string{}
+	proxiesConfig := cfg.Proxy
+	groupsConfig := cfg.ProxyGroup
+
+	decoder := structure.NewDecoder(structure.Option{TagName: "proxy", WeaklyTypedInput: true})
+
+	proxies["DIRECT"] = adapters.NewProxy(adapters.NewDirect())
+	proxies["REJECT"] = adapters.NewProxy(adapters.NewReject())
+	proxyList = append(proxyList, "DIRECT", "REJECT")
+
+	// parse proxy
+	for idx, mapping := range proxiesConfig {
+		proxyType, existType := mapping["type"].(string)
+		if !existType {
+			return nil, fmt.Errorf("Proxy %d missing type", idx)
+		}
+
+		var proxy C.ProxyAdapter
+		err := fmt.Errorf("cannot parse")
+		switch proxyType {
+		case "ss":
+			ssOption := &adapters.ShadowSocksOption{}
+			err = decoder.Decode(mapping, ssOption)
+			if err != nil {
+				break
+			}
+			proxy, err = adapters.NewShadowSocks(*ssOption)
+		case "socks5":
+			socksOption := &adapters.Socks5Option{}
+			err = decoder.Decode(mapping, socksOption)
+			if err != nil {
+				break
+			}
+			proxy = adapters.NewSocks5(*socksOption)
+		case "http":
+			httpOption := &adapters.HttpOption{}
+			err = decoder.Decode(mapping, httpOption)
+			if err != nil {
+				break
+			}
+			proxy = adapters.NewHttp(*httpOption)
+		case "vmess":
+			vmessOption := &adapters.VmessOption{}
+			err = decoder.Decode(mapping, vmessOption)
+			if err != nil {
+				break
+			}
+			proxy, err = adapters.NewVmess(*vmessOption)
+		case "snell":
+			snellOption := &adapters.SnellOption{}
+			err = decoder.Decode(mapping, snellOption)
+			if err != nil {
+				break
+			}
+			proxy, err = adapters.NewSnell(*snellOption)
+		default:
+			return nil, fmt.Errorf("Unsupport proxy type: %s", proxyType)
+		}
+
+		if err != nil {
+			return nil, fmt.Errorf("Proxy [%d]: %s", idx, err.Error())
+		}
+
+		if _, exist := proxies[proxy.Name()]; exist {
+			return nil, fmt.Errorf("Proxy %s is the duplicate name", proxy.Name())
+		}
+		proxies[proxy.Name()] = adapters.NewProxy(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, fmt.Errorf("ProxyGroup %d: missing name", idx)
+		}
+		proxyList = append(proxyList, groupName)
+	}
+
+	// check if any loop exists and sort the ProxyGroups
+	if err := proxyGroupsDagSort(groupsConfig, decoder); err != nil {
+		return nil, err
+	}
+
+	// parse proxy group
+	for _, mapping := range groupsConfig {
+		groupType, existType := mapping["type"].(string)
+		groupName, _ := mapping["name"].(string)
+		if !existType {
+			return nil, fmt.Errorf("ProxyGroup %s: missing type", groupName)
+		}
+
+		if _, exist := proxies[groupName]; exist {
+			return nil, fmt.Errorf("ProxyGroup %s: the duplicate name", groupName)
+		}
+		var group C.ProxyAdapter
+		ps := []C.Proxy{}
+
+		err := fmt.Errorf("cannot parse")
+		switch groupType {
+		case "url-test":
+			urlTestOption := &adapters.URLTestOption{}
+			err = decoder.Decode(mapping, urlTestOption)
+			if err != nil {
+				break
+			}
+
+			ps, err = getProxies(proxies, urlTestOption.Proxies)
+			if err != nil {
+				return nil, fmt.Errorf("ProxyGroup %s: %s", groupName, err.Error())
+			}
+			group, err = adapters.NewURLTest(*urlTestOption, ps)
+		case "select":
+			selectorOption := &adapters.SelectorOption{}
+			err = decoder.Decode(mapping, selectorOption)
+			if err != nil {
+				break
+			}
+
+			ps, err = getProxies(proxies, selectorOption.Proxies)
+			if err != nil {
+				return nil, fmt.Errorf("ProxyGroup %s: %s", groupName, err.Error())
+			}
+			group, err = adapters.NewSelector(selectorOption.Name, ps)
+		case "fallback":
+			fallbackOption := &adapters.FallbackOption{}
+			err = decoder.Decode(mapping, fallbackOption)
+			if err != nil {
+				break
+			}
+
+			ps, err = getProxies(proxies, fallbackOption.Proxies)
+			if err != nil {
+				return nil, fmt.Errorf("ProxyGroup %s: %s", groupName, err.Error())
+			}
+			group, err = adapters.NewFallback(*fallbackOption, ps)
+		case "load-balance":
+			loadBalanceOption := &adapters.LoadBalanceOption{}
+			err = decoder.Decode(mapping, loadBalanceOption)
+			if err != nil {
+				break
+			}
+
+			ps, err = getProxies(proxies, loadBalanceOption.Proxies)
+			if err != nil {
+				return nil, fmt.Errorf("ProxyGroup %s: %s", groupName, err.Error())
+			}
+			group, err = adapters.NewLoadBalance(*loadBalanceOption, ps)
+		}
+		if err != nil {
+			return nil, fmt.Errorf("Proxy %s: %s", groupName, err.Error())
+		}
+		proxies[groupName] = adapters.NewProxy(group)
+	}
+
+	ps := []C.Proxy{}
+	for _, v := range proxyList {
+		ps = append(ps, proxies[v])
+	}
+
+	global, _ := adapters.NewSelector("GLOBAL", ps)
+	proxies["GLOBAL"] = adapters.NewProxy(global)
+	return proxies, 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
+		)
+
+		switch len(rule) {
+		case 2:
+			target = rule[1]
+		case 3:
+			payload = rule[1]
+			target = rule[2]
+		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)
+		var parsed C.Rule
+		switch rule[0] {
+		case "DOMAIN":
+			parsed = R.NewDomain(payload, target)
+		case "DOMAIN-SUFFIX":
+			parsed = R.NewDomainSuffix(payload, target)
+		case "DOMAIN-KEYWORD":
+			parsed = R.NewDomainKeyword(payload, target)
+		case "GEOIP":
+			parsed = R.NewGEOIP(payload, target)
+		case "IP-CIDR", "IP-CIDR6":
+			if rule := R.NewIPCIDR(payload, target, false); rule != nil {
+				parsed = rule
+			}
+		// deprecated when bump to 1.0
+		case "SOURCE-IP-CIDR":
+			fallthrough
+		case "SRC-IP-CIDR":
+			if rule := R.NewIPCIDR(payload, target, true); rule != nil {
+				parsed = rule
+			}
+		case "SRC-PORT":
+			if rule := R.NewPort(payload, target, true); rule != nil {
+				parsed = rule
+			}
+		case "DST-PORT":
+			if rule := R.NewPort(payload, target, false); rule != nil {
+				parsed = rule
+			}
+		case "MATCH":
+			fallthrough
+		// deprecated when bump to 1.0
+		case "FINAL":
+			parsed = R.NewMatch(target)
+		}
+
+		if parsed == nil {
+			return nil, fmt.Errorf("Rules[%d] [%s] error: payload invalid", idx, line)
+		}
+
+		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)
+		}
+	}
+
+	return tree, nil
+}
+
+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
+		}
+		pool, err := fakeip.New(ipnet, 1000)
+		if err != nil {
+			return nil, err
+		}
+
+		dnsCfg.FakeIPRange = pool
+	}
+
+	dnsCfg.FallbackFilter.GeoIP = cfg.FallbackFilter.GeoIP
+	if fallbackip, err := parseFallbackIPCIDR(cfg.FallbackFilter.IPCIDR); err == nil {
+		dnsCfg.FallbackFilter.IPCIDR = fallbackip
+	}
+
+	return dnsCfg, nil
+}
+
+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

@@ -0,0 +1,81 @@
+package config
+
+import (
+	"archive/tar"
+	"compress/gzip"
+	"fmt"
+	"io"
+	"net/http"
+	"os"
+	"strings"
+
+	C "github.com/Dreamacro/clash/constant"
+
+	log "github.com/sirupsen/logrus"
+)
+
+func downloadMMDB(path string) (err error) {
+	resp, err := http.Get("http://geolite.maxmind.com/download/geoip/database/GeoLite2-Country.tar.gz")
+	if err != nil {
+		return
+	}
+	defer resp.Body.Close()
+
+	gr, err := gzip.NewReader(resp.Body)
+	if err != nil {
+		return
+	}
+	defer gr.Close()
+
+	tr := tar.NewReader(gr)
+	for {
+		h, err := tr.Next()
+		if err == io.EOF {
+			break
+		} else if err != nil {
+			return err
+		}
+
+		if !strings.HasSuffix(h.Name, "GeoLite2-Country.mmdb") {
+			continue
+		}
+
+		f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0644)
+		if err != nil {
+			return err
+		}
+		defer f.Close()
+		_, err = io.Copy(f, tr)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
+// Init prepare necessary files
+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.Info("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.Path.MMDB()); os.IsNotExist(err) {
+		log.Info("Can't find MMDB, start download")
+		err := downloadMMDB(C.Path.MMDB())
+		if err != nil {
+			return fmt.Errorf("Can't download MMDB: %s", err.Error())
+		}
+	}
+	return nil
+}

config/utils.go

@@ -0,0 +1,159 @@
+package config
+
+import (
+	"fmt"
+	"strings"
+
+	adapters "github.com/Dreamacro/clash/adapters/outbound"
+	"github.com/Dreamacro/clash/common/structure"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+func trimArr(arr []string) (r []string) {
+	for _, e := range arr {
+		r = append(r, strings.Trim(e, " "))
+	}
+	return
+}
+
+func getProxies(mapping map[string]C.Proxy, list []string) ([]C.Proxy, error) {
+	var ps []C.Proxy
+	for _, name := range list {
+		p, ok := mapping[name]
+		if !ok {
+			return nil, fmt.Errorf("'%s' not found", name)
+		}
+		ps = append(ps, p)
+	}
+	return ps, nil
+}
+
+func or(pointers ...*int) *int {
+	for _, p := range pointers {
+		if p != nil {
+			return p
+		}
+	}
+	return pointers[len(pointers)-1]
+}
+
+// Check if ProxyGroups form DAG(Directed Acyclic Graph), and sort all ProxyGroups by dependency order.
+// Meanwhile, record the original index in the config file.
+// If loop is detected, return an error with location of loop.
+func proxyGroupsDagSort(groupsConfig []map[string]interface{}, decoder *structure.Decoder) 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
+		from      []string
+	}
+
+	graph := make(map[string]*graphNode)
+
+	// Step 1.1 build dependency graph
+	for _, mapping := range groupsConfig {
+		option := &adapters.ProxyGroupOption{}
+		err := decoder.Decode(mapping, option)
+		groupName := option.Name
+		if err != nil {
+			return fmt.Errorf("ProxyGroup %s: %s", groupName, err.Error())
+		}
+
+		if node, ok := graph[groupName]; ok {
+			if node.data != nil {
+				return fmt.Errorf("ProxyGroup %s: duplicate group name", groupName)
+			}
+			node.data = mapping
+		} else {
+			graph[groupName] = &graphNode{0, -1, mapping, 0, nil}
+		}
+
+		for _, proxy := range option.Proxies {
+			if node, ex := graph[proxy]; ex {
+				node.indegree++
+			} else {
+				graph[proxy] = &graphNode{1, -1, nil, 0, 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.data != nil {
+			index++
+			groupsConfig[len(groupsConfig)-index] = node.data
+			for _, proxy := range node.data["proxies"].([]interface{}) {
+				child := graph[proxy.(string)]
+				child.indegree--
+				if child.indegree == 0 {
+					queue = append(queue, proxy.(string))
+				}
+			}
+		}
+		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.data == nil {
+			continue
+		}
+		for _, proxy := range node.data["proxies"].([]interface{}) {
+			node.outdegree++
+			child := graph[proxy.(string)]
+			if child.from == nil {
+				child.from = make([]string, 0, child.indegree)
+			}
+			child.from = append(child.from, name)
+		}
+	}
+	// 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

@@ -1,23 +1,112 @@
 package constant
 
 import (
-	"io"
+	"context"
+	"fmt"
 	"net"
+	"time"
 )
 
-type ProxyAdapter interface {
-	ReadWriter() io.ReadWriter
-	Conn() net.Conn
-	Close()
-}
+// Adapter Type
+const (
+	Direct AdapterType = iota
+	Fallback
+	Reject
+	Selector
+	Shadowsocks
+	Snell
+	Socks5
+	Http
+	URLTest
+	Vmess
+	LoadBalance
+)
 
 type ServerAdapter interface {
-	Addr() *Addr
-	Connect(ProxyAdapter)
-	Close()
+	net.Conn
+	Metadata() *Metadata
+}
+
+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
+	Destroy()
+	MarshalJSON() ([]byte, error)
+}
+
+type DelayHistory struct {
+	Time  time.Time `json:"time"`
+	Delay uint16    `json:"delay"`
 }
 
 type Proxy interface {
-	Name() string
-	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
+type AdapterType int
+
+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 "Unknown"
+	}
 }

constant/addr.go

@@ -1,40 +0,0 @@
-package constant
-
-import (
-	"net"
-)
-
-// Socks addr type
-const (
-	AtypIPv4       = 1
-	AtypDomainName = 3
-	AtypIPv6       = 4
-
-	TCP = iota
-	UDP
-)
-
-type NetWork int
-
-func (n *NetWork) String() string {
-	if *n == TCP {
-		return "tcp"
-	}
-	return "udp"
-}
-
-// Addr is used to store connection address
-type Addr struct {
-	NetWork  NetWork
-	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

@@ -1,112 +0,0 @@
-package constant
-
-import (
-	"archive/tar"
-	"compress/gzip"
-	"io"
-	"net/http"
-	"os"
-	"os/user"
-	"path"
-	"strings"
-
-	log "github.com/sirupsen/logrus"
-	"gopkg.in/ini.v1"
-)
-
-const (
-	Name             = "clash"
-	DefalutHTTPPort  = "7890"
-	DefalutSOCKSPort = "7891"
-)
-
-var (
-	HomeDir    string
-	ConfigPath string
-	MMDBPath   string
-)
-
-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")
-	if _, err := os.Stat(ConfigPath); os.IsNotExist(err) {
-		log.Info("Can't find config, create a empty file")
-		os.OpenFile(ConfigPath, os.O_CREATE|os.O_WRONLY, 0644)
-	}
-
-	MMDBPath = path.Join(dirPath, "Country.mmdb")
-	if _, err := os.Stat(MMDBPath); os.IsNotExist(err) {
-		log.Info("Can't find MMDB, start download")
-		err := downloadMMDB(MMDBPath)
-		if err != nil {
-			log.Fatalf("Can't download MMDB: %s", err.Error())
-		}
-	}
-}
-
-func downloadMMDB(path string) (err error) {
-	resp, err := http.Get("http://geolite.maxmind.com/download/geoip/database/GeoLite2-Country.tar.gz")
-	if err != nil {
-		return
-	}
-	defer resp.Body.Close()
-
-	gr, err := gzip.NewReader(resp.Body)
-	if err != nil {
-		return
-	}
-	defer gr.Close()
-
-	tr := tar.NewReader(gr)
-	for {
-		h, err := tr.Next()
-		if err == io.EOF {
-			break
-		} else if err != nil {
-			return err
-		}
-
-		if !strings.HasSuffix(h.Name, "GeoLite2-Country.mmdb") {
-			continue
-		}
-
-		f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0644)
-		if err != nil {
-			return err
-		}
-		defer f.Close()
-		_, err = io.Copy(f, tr)
-		if err != nil {
-			return err
-		}
-	}
-
-	return nil
-}
-
-func GetConfig() (*ini.File, error) {
-	if _, err := os.Stat(ConfigPath); os.IsNotExist(err) {
-		return nil, err
-	}
-	return ini.LoadSources(
-		ini.LoadOptions{AllowBooleanKeys: true},
-		ConfigPath,
-	)
-}

constant/metadata.go

@@ -0,0 +1,60 @@
+package constant
+
+import (
+	"net"
+)
+
+// Socks addr type
+const (
+	AtypIPv4       = 1
+	AtypDomainName = 3
+	AtypIPv6       = 4
+
+	TCP NetWork = iota
+	UDP
+
+	HTTP Type = iota
+	SOCKS
+	REDIR
+)
+
+type NetWork int
+
+func (n *NetWork) String() string {
+	if *n == TCP {
+		return "tcp"
+	}
+	return "udp"
+}
+
+type Type int
+
+// Metadata is used to store connection address
+type Metadata struct {
+	NetWork  NetWork
+	Type     Type
+	SrcIP    *net.IP
+	DstIP    *net.IP
+	SrcPort  string
+	DstPort  string
+	AddrType int
+	Host     string
+}
+
+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 +1,42 @@
+package constant
+
+import (
+	"os"
+	P "path"
+)
+
+const Name = "clash"
+
+// Path is used to get the configuration path
+var Path *path
+
+type path struct {
+	homedir string
+}
+
+func init() {
+	homedir, err := os.UserHomeDir()
+	if err != nil {
+		homedir, _ = os.Getwd()
+	}
+
+	homedir = P.Join(homedir, ".config", Name)
+	Path = &path{homedir: homedir}
+}
+
+// SetHomeDir is used to set the configuration path
+func SetHomeDir(root string) {
+	Path = &path{homedir: root}
+}
+
+func (p *path) HomeDir() string {
+	return p.homedir
+}
+
+func (p *path) Config() string {
+	return P.Join(p.homedir, "config.yaml")
+}
+
+func (p *path) MMDB() string {
+	return P.Join(p.homedir, "Country.mmdb")
+}

constant/rule.go

@@ -2,17 +2,47 @@ package constant
 
 // Rule Type
 const (
-	DomainSuffix RuleType = iota
+	Domain RuleType = iota
+	DomainSuffix
 	DomainKeyword
 	GEOIP
 	IPCIDR
-	FINAL
+	SrcIPCIDR
+	SrcPort
+	DstPort
+	MATCH
 )
 
 type RuleType int
 
+func (rt RuleType) String() string {
+	switch rt {
+	case Domain:
+		return "Domain"
+	case DomainSuffix:
+		return "DomainSuffix"
+	case DomainKeyword:
+		return "DomainKeyword"
+	case GEOIP:
+		return "GEOIP"
+	case IPCIDR:
+		return "IPCIDR"
+	case SrcIPCIDR:
+		return "SrcIPCIDR"
+	case SrcPort:
+		return "SrcPort"
+	case DstPort:
+		return "DstPort"
+	case MATCH:
+		return "MATCH"
+	default:
+		return "Unknown"
+	}
+}
+
 type Rule interface {
 	RuleType() RuleType
-	IsMatch(addr *Addr) bool
+	IsMatch(metadata *Metadata) bool
 	Adapter() string
+	Payload() string
 }

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 +1,75 @@
+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"
+
+	// dotPath is the URL path that should be used.
+	dotPath = "/dns-query"
+)
+
+var dohTransport = &http.Transport{
+	TLSClientConfig: &tls.Config{ClientSessionCache: globalSessionCache},
+}
+
+type dohClient struct {
+	url string
+}
+
+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)
+}

dns/iputil.go

@@ -0,0 +1,106 @@
+package dns
+
+import (
+	"errors"
+	"net"
+	"strings"
+)
+
+var (
+	errIPNotFound = errors.New("cannot found ip")
+	errIPVersion  = errors.New("ip version error")
+)
+
+// ResolveIPv4 with a host, return ipv4
+func ResolveIPv4(host string) (net.IP, error) {
+	if node := DefaultHosts.Search(host); node != nil {
+		if ip := node.Data.(net.IP).To4(); ip != nil {
+			return ip, nil
+		}
+	}
+
+	ip := net.ParseIP(host)
+	if ip != nil {
+		if !strings.Contains(host, ":") {
+			return ip, nil
+		}
+		return nil, errIPVersion
+	}
+
+	if DefaultResolver != nil {
+		return DefaultResolver.ResolveIPv4(host)
+	}
+
+	ipAddrs, err := net.LookupIP(host)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, ip := range ipAddrs {
+		if ip4 := ip.To4(); ip4 != nil {
+			return ip4, nil
+		}
+	}
+
+	return nil, errIPNotFound
+}
+
+// ResolveIPv6 with a host, return ipv6
+func ResolveIPv6(host string) (net.IP, error) {
+	if node := DefaultHosts.Search(host); node != nil {
+		if ip := node.Data.(net.IP).To16(); ip != nil {
+			return ip, nil
+		}
+	}
+
+	ip := net.ParseIP(host)
+	if ip != nil {
+		if strings.Contains(host, ":") {
+			return ip, nil
+		}
+		return nil, errIPVersion
+	}
+
+	if DefaultResolver != nil {
+		return DefaultResolver.ResolveIPv6(host)
+	}
+
+	ipAddrs, err := net.LookupIP(host)
+	if err != nil {
+		return nil, err
+	}
+
+	for _, ip := range ipAddrs {
+		if ip.To4() == nil {
+			return ip, nil
+		}
+	}
+
+	return nil, errIPNotFound
+}
+
+// ResolveIP with a host, return ip
+func ResolveIP(host string) (net.IP, error) {
+	if node := DefaultHosts.Search(host); node != nil {
+		return node.Data.(net.IP), nil
+	}
+
+	if DefaultResolver != nil {
+		if DefaultResolver.ipv6 {
+			return DefaultResolver.ResolveIP(host)
+		}
+		return DefaultResolver.ResolveIPv4(host)
+	}
+
+	ip := net.ParseIP(host)
+	if ip != nil {
+		return ip, nil
+	}
+
+	ipAddr, err := net.ResolveIPAddr("ip", host)
+	if err != nil {
+		return nil, err
+	}
+
+	return ipAddr.IP, nil
+}

dns/middleware.go

@@ -0,0 +1,79 @@
+package dns
+
+import (
+	"strings"
+
+	"github.com/Dreamacro/clash/component/fakeip"
+	"github.com/Dreamacro/clash/log"
+
+	D "github.com/miekg/dns"
+)
+
+type handler func(w D.ResponseWriter, r *D.Msg)
+type middleware func(next handler) handler
+
+func withFakeIP(fakePool *fakeip.Pool) middleware {
+	return func(next handler) handler {
+		return func(w D.ResponseWriter, r *D.Msg) {
+			q := r.Question[0]
+
+			if q.Qtype == D.TypeAAAA {
+				D.HandleFailed(w, r)
+				return
+			} else if q.Qtype != D.TypeA {
+				next(w, r)
+				return
+			}
+
+			host := strings.TrimRight(q.Name, ".")
+
+			rr := &D.A{}
+			rr.Hdr = D.RR_Header{Name: q.Name, Rrtype: D.TypeA, Class: D.ClassINET, Ttl: dnsDefaultTTL}
+			ip := fakePool.Lookup(host)
+			rr.A = ip
+			msg := r.Copy()
+			msg.Answer = []D.RR{rr}
+
+			setMsgTTL(msg, 1)
+			msg.SetReply(r)
+			w.WriteMsg(msg)
+			return
+		}
+	}
+}
+
+func withResolver(resolver *Resolver) handler {
+	return func(w D.ResponseWriter, r *D.Msg) {
+		msg, err := resolver.Exchange(r)
+		if err != nil {
+			q := r.Question[0]
+			log.Debugln("[DNS Server] Exchange %s failed: %v", q.String(), err)
+			D.HandleFailed(w, r)
+			return
+		}
+		msg.SetReply(r)
+		w.WriteMsg(msg)
+		return
+	}
+}
+
+func compose(middlewares []middleware, endpoint handler) handler {
+	length := len(middlewares)
+	h := endpoint
+	for i := length - 1; i >= 0; i-- {
+		middleware := middlewares[i]
+		h = middleware(h)
+	}
+
+	return h
+}
+
+func newHandler(resolver *Resolver) handler {
+	middlewares := []middleware{}
+
+	if resolver.IsFakeIP() {
+		middlewares = append(middlewares, withFakeIP(resolver.pool))
+	}
+
+	return compose(middlewares, withResolver(resolver))
+}

dns/resolver.go

@@ -0,0 +1,317 @@
+package dns
+
+import (
+	"context"
+	"crypto/tls"
+	"errors"
+	"net"
+	"strings"
+	"sync"
+	"time"
+
+	"github.com/Dreamacro/clash/common/cache"
+	"github.com/Dreamacro/clash/common/picker"
+	trie "github.com/Dreamacro/clash/component/domain-trie"
+	"github.com/Dreamacro/clash/component/fakeip"
+	C "github.com/Dreamacro/clash/constant"
+
+	D "github.com/miekg/dns"
+	geoip2 "github.com/oschwald/geoip2-golang"
+	"golang.org/x/sync/singleflight"
+)
+
+var (
+	// DefaultResolver aim to resolve ip
+	DefaultResolver *Resolver
+
+	// DefaultHosts aim to resolve hosts
+	DefaultHosts = trie.New()
+)
+
+var (
+	globalSessionCache = tls.NewLRUClientSessionCache(64)
+
+	mmdb *geoip2.Reader
+	once sync.Once
+)
+
+type resolver interface {
+	Exchange(m *D.Msg) (msg *D.Msg, err error)
+	ExchangeContext(ctx context.Context, m *D.Msg) (msg *D.Msg, err error)
+}
+
+type result struct {
+	Msg   *D.Msg
+	Error error
+}
+
+type Resolver struct {
+	ipv6            bool
+	mapping         bool
+	fakeip          bool
+	pool            *fakeip.Pool
+	main            []resolver
+	fallback        []resolver
+	fallbackFilters []fallbackFilter
+	group           singleflight.Group
+	cache           *cache.Cache
+}
+
+// ResolveIP request with TypeA and TypeAAAA, priority return TypeAAAA
+func (r *Resolver) ResolveIP(host string) (ip net.IP, err error) {
+	ch := make(chan net.IP)
+	go func() {
+		defer close(ch)
+		ip, err := r.resolveIP(host, D.TypeA)
+		if err != nil {
+			return
+		}
+		ch <- ip
+	}()
+
+	ip, err = r.resolveIP(host, D.TypeAAAA)
+	if err == nil {
+		go func() {
+			<-ch
+		}()
+		return
+	}
+
+	ip, open := <-ch
+	if !open {
+		return nil, errIPNotFound
+	}
+
+	return ip, nil
+}
+
+// ResolveIPv4 request with TypeA
+func (r *Resolver) ResolveIPv4(host string) (ip net.IP, err error) {
+	return r.resolveIP(host, D.TypeA)
+}
+
+// ResolveIPv6 request with TypeAAAA
+func (r *Resolver) ResolveIPv6(host string) (ip net.IP, err error) {
+	return r.resolveIP(host, D.TypeAAAA)
+}
+
+func (r *Resolver) shouldFallback(ip net.IP) bool {
+	for _, filter := range r.fallbackFilters {
+		if filter.Match(ip) {
+			return true
+		}
+	}
+	return false
+}
+
+// Exchange a batch of dns request, and it use cache
+func (r *Resolver) Exchange(m *D.Msg) (msg *D.Msg, err error) {
+	if len(m.Question) == 0 {
+		return nil, errors.New("should have one question at least")
+	}
+
+	q := m.Question[0]
+	cache, expireTime := r.cache.GetWithExpire(q.String())
+	if cache != nil {
+		msg = cache.(*D.Msg).Copy()
+		setMsgTTL(msg, uint32(expireTime.Sub(time.Now()).Seconds()))
+		return
+	}
+	defer func() {
+		if msg == nil {
+			return
+		}
+
+		putMsgToCache(r.cache, q.String(), msg)
+		if r.mapping {
+			ips := r.msgToIP(msg)
+			for _, ip := range ips {
+				putMsgToCache(r.cache, ip.String(), msg)
+			}
+		}
+	}()
+
+	ret, err, _ := r.group.Do(q.String(), func() (interface{}, error) {
+		isIPReq := isIPRequest(q)
+		if isIPReq {
+			msg, err := r.fallbackExchange(m)
+			return msg, err
+		}
+
+		return r.batchExchange(r.main, m)
+	})
+
+	if err == nil {
+		msg = ret.(*D.Msg)
+	}
+
+	return
+}
+
+// IPToHost return fake-ip or redir-host mapping host
+func (r *Resolver) IPToHost(ip net.IP) (string, bool) {
+	if r.fakeip {
+		return r.pool.LookBack(ip)
+	}
+
+	cache := r.cache.Get(ip.String())
+	if cache == nil {
+		return "", false
+	}
+	fqdn := cache.(*D.Msg).Question[0].Name
+	return strings.TrimRight(fqdn, "."), true
+}
+
+func (r *Resolver) IsMapping() bool {
+	return r.mapping
+}
+
+func (r *Resolver) IsFakeIP() bool {
+	return r.fakeip
+}
+
+func (r *Resolver) batchExchange(clients []resolver, m *D.Msg) (msg *D.Msg, err error) {
+	fast, ctx := picker.WithTimeout(context.Background(), time.Second)
+	for _, client := range clients {
+		r := client
+		fast.Go(func() (interface{}, error) {
+			msg, err := r.ExchangeContext(ctx, m)
+			if err != nil || msg.Rcode != D.RcodeSuccess {
+				return nil, errors.New("resolve error")
+			}
+			return msg, nil
+		})
+	}
+
+	elm := fast.Wait()
+	if elm == nil {
+		return nil, errors.New("All DNS requests failed")
+	}
+
+	msg = elm.(*D.Msg)
+	return
+}
+
+func (r *Resolver) fallbackExchange(m *D.Msg) (msg *D.Msg, err error) {
+	msgCh := r.asyncExchange(r.main, m)
+	if r.fallback == nil {
+		res := <-msgCh
+		msg, err = res.Msg, res.Error
+		return
+	}
+	fallbackMsg := r.asyncExchange(r.fallback, m)
+	res := <-msgCh
+	if res.Error == nil {
+		if ips := r.msgToIP(res.Msg); len(ips) != 0 {
+			if r.shouldFallback(ips[0]) {
+				go func() { <-fallbackMsg }()
+				msg = res.Msg
+				return msg, err
+			}
+		}
+	}
+
+	res = <-fallbackMsg
+	msg, err = res.Msg, res.Error
+	return
+}
+
+func (r *Resolver) resolveIP(host string, dnsType uint16) (ip net.IP, err error) {
+	ip = net.ParseIP(host)
+	if ip != nil {
+		isIPv4 := ip.To4() != nil
+		if dnsType == D.TypeAAAA && !isIPv4 {
+			return ip, nil
+		} else if dnsType == D.TypeA && isIPv4 {
+			return ip, nil
+		}
+	}
+
+	query := &D.Msg{}
+	query.SetQuestion(D.Fqdn(host), dnsType)
+
+	msg, err := r.Exchange(query)
+	if err != nil {
+		return nil, err
+	}
+
+	ips := r.msgToIP(msg)
+	if len(ips) == 0 {
+		return nil, errIPNotFound
+	}
+
+	ip = ips[0]
+	return
+}
+
+func (r *Resolver) msgToIP(msg *D.Msg) []net.IP {
+	ips := []net.IP{}
+
+	for _, answer := range msg.Answer {
+		switch ans := answer.(type) {
+		case *D.AAAA:
+			ips = append(ips, ans.AAAA)
+		case *D.A:
+			ips = append(ips, ans.A)
+		}
+	}
+
+	return ips
+}
+
+func (r *Resolver) asyncExchange(client []resolver, msg *D.Msg) <-chan *result {
+	ch := make(chan *result)
+	go func() {
+		res, err := r.batchExchange(client, msg)
+		ch <- &result{Msg: res, Error: err}
+	}()
+	return ch
+}
+
+type NameServer struct {
+	Net  string
+	Addr string
+}
+
+type FallbackFilter struct {
+	GeoIP  bool
+	IPCIDR []*net.IPNet
+}
+
+type Config struct {
+	Main, Fallback []NameServer
+	IPv6           bool
+	EnhancedMode   EnhancedMode
+	FallbackFilter FallbackFilter
+	Pool           *fakeip.Pool
+}
+
+func New(config Config) *Resolver {
+	r := &Resolver{
+		ipv6:    config.IPv6,
+		main:    transform(config.Main),
+		cache:   cache.New(time.Second * 60),
+		mapping: config.EnhancedMode == MAPPING,
+		fakeip:  config.EnhancedMode == FAKEIP,
+		pool:    config.Pool,
+	}
+
+	if len(config.Fallback) != 0 {
+		r.fallback = transform(config.Fallback)
+	}
+
+	fallbackFilters := []fallbackFilter{}
+	if config.FallbackFilter.GeoIP {
+		once.Do(func() {
+			mmdb, _ = geoip2.Open(C.Path.MMDB())
+		})
+
+		fallbackFilters = append(fallbackFilters, &geoipFilter{})
+	}
+	for _, ipnet := range config.FallbackFilter.IPCIDR {
+		fallbackFilters = append(fallbackFilters, &ipnetFilter{ipnet: ipnet})
+	}
+	r.fallbackFilters = fallbackFilters
+
+	return r
+}

dns/server.go

@@ -0,0 +1,70 @@
+package dns
+
+import (
+	"net"
+
+	D "github.com/miekg/dns"
+)
+
+var (
+	address string
+	server  = &Server{}
+
+	dnsDefaultTTL uint32 = 600
+)
+
+type Server struct {
+	*D.Server
+	handler handler
+}
+
+func (s *Server) ServeDNS(w D.ResponseWriter, r *D.Msg) {
+	if len(r.Question) == 0 {
+		D.HandleFailed(w, r)
+		return
+	}
+
+	s.handler(w, r)
+}
+
+func (s *Server) setHandler(handler handler) {
+	s.handler = handler
+}
+
+func ReCreateServer(addr string, resolver *Resolver) error {
+	if addr == address && resolver != nil {
+		handler := newHandler(resolver)
+		server.setHandler(handler)
+		return nil
+	}
+
+	if server.Server != nil {
+		server.Shutdown()
+		address = ""
+	}
+
+	_, port, err := net.SplitHostPort(addr)
+	if port == "0" || port == "" || err != nil {
+		return nil
+	}
+
+	udpAddr, err := net.ResolveUDPAddr("udp", addr)
+	if err != nil {
+		return err
+	}
+
+	p, err := net.ListenUDP("udp", udpAddr)
+	if err != nil {
+		return err
+	}
+
+	address = addr
+	handler := newHandler(resolver)
+	server = &Server{handler: handler}
+	server.Server = &D.Server{Addr: addr, PacketConn: p, Handler: server}
+
+	go func() {
+		server.ActivateAndServe()
+	}()
+	return nil
+}

dns/util.go

@@ -0,0 +1,141 @@
+package dns
+
+import (
+	"crypto/tls"
+	"encoding/json"
+	"errors"
+	"time"
+
+	"github.com/Dreamacro/clash/common/cache"
+	"github.com/Dreamacro/clash/log"
+	yaml "gopkg.in/yaml.v2"
+
+	D "github.com/miekg/dns"
+)
+
+var (
+	// EnhancedModeMapping is a mapping for EnhancedMode enum
+	EnhancedModeMapping = map[string]EnhancedMode{
+		NORMAL.String():  NORMAL,
+		FAKEIP.String():  FAKEIP,
+		MAPPING.String(): MAPPING,
+	}
+)
+
+const (
+	NORMAL EnhancedMode = iota
+	FAKEIP
+	MAPPING
+)
+
+type EnhancedMode int
+
+// UnmarshalYAML unserialize EnhancedMode with yaml
+func (e *EnhancedMode) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var tp string
+	if err := unmarshal(&tp); err != nil {
+		return err
+	}
+	mode, exist := EnhancedModeMapping[tp]
+	if !exist {
+		return errors.New("invalid mode")
+	}
+	*e = mode
+	return nil
+}
+
+// MarshalYAML serialize EnhancedMode with yaml
+func (e EnhancedMode) MarshalYAML() ([]byte, error) {
+	return yaml.Marshal(e.String())
+}
+
+// UnmarshalJSON unserialize EnhancedMode with json
+func (e *EnhancedMode) UnmarshalJSON(data []byte) error {
+	var tp string
+	json.Unmarshal(data, &tp)
+	mode, exist := EnhancedModeMapping[tp]
+	if !exist {
+		return errors.New("invalid mode")
+	}
+	*e = mode
+	return nil
+}
+
+// MarshalJSON serialize EnhancedMode with json
+func (e EnhancedMode) MarshalJSON() ([]byte, error) {
+	return json.Marshal(e.String())
+}
+
+func (e EnhancedMode) String() string {
+	switch e {
+	case NORMAL:
+		return "normal"
+	case FAKEIP:
+		return "fake-ip"
+	case MAPPING:
+		return "redir-host"
+	default:
+		return "unknown"
+	}
+}
+
+func putMsgToCache(c *cache.Cache, key string, msg *D.Msg) {
+	var ttl time.Duration
+	if len(msg.Answer) != 0 {
+		ttl = time.Duration(msg.Answer[0].Header().Ttl) * time.Second
+	} else if len(msg.Ns) != 0 {
+		ttl = time.Duration(msg.Ns[0].Header().Ttl) * time.Second
+	} else if len(msg.Extra) != 0 {
+		ttl = time.Duration(msg.Extra[0].Header().Ttl) * time.Second
+	} else {
+		log.Debugln("[DNS] response msg error: %#v", msg)
+		return
+	}
+
+	c.Put(key, msg.Copy(), ttl)
+}
+
+func setMsgTTL(msg *D.Msg, ttl uint32) {
+	for _, answer := range msg.Answer {
+		answer.Header().Ttl = ttl
+	}
+
+	for _, ns := range msg.Ns {
+		ns.Header().Ttl = ttl
+	}
+
+	for _, extra := range msg.Extra {
+		extra.Header().Ttl = ttl
+	}
+}
+
+func isIPRequest(q D.Question) bool {
+	if q.Qclass == D.ClassINET && (q.Qtype == D.TypeA || q.Qtype == D.TypeAAAA) {
+		return true
+	}
+	return false
+}
+
+func transform(servers []NameServer) []resolver {
+	ret := []resolver{}
+	for _, s := range servers {
+		if s.Net == "https" {
+			ret = append(ret, &dohClient{url: s.Addr})
+			continue
+		}
+
+		ret = append(ret, &client{
+			Client: &D.Client{
+				Net: s.Net,
+				TLSConfig: &tls.Config{
+					ClientSessionCache: globalSessionCache,
+					// alpn identifier, see https://tools.ietf.org/html/draft-hoffman-dprive-dns-tls-alpn-00#page-6
+					NextProtos: []string{"dns"},
+				},
+				UDPSize: 4096,
+			},
+			Address: s.Addr,
+		})
+	}
+	return ret
+}

go.mod

@@ -0,0 +1,23 @@
+module github.com/Dreamacro/clash
+
+go 1.13
+
+require (
+	github.com/Dreamacro/go-shadowsocks2 v0.1.5-0.20191012162057-46254afc8b68
+	github.com/eapache/queue v1.1.0 // indirect
+	github.com/go-chi/chi v4.0.2+incompatible
+	github.com/go-chi/cors v1.0.0
+	github.com/go-chi/render v1.0.1
+	github.com/gofrs/uuid v3.2.0+incompatible
+	github.com/gorilla/websocket v1.4.1
+	github.com/miekg/dns v1.1.22
+	github.com/oschwald/geoip2-golang v1.3.0
+	github.com/oschwald/maxminddb-golang v1.5.0 // indirect
+	github.com/sirupsen/logrus v1.4.2
+	github.com/stretchr/testify v1.4.0
+	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
+	golang.org/x/net v0.0.0-20191011234655-491137f69257
+	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
+	gopkg.in/eapache/channels.v1 v1.1.0
+	gopkg.in/yaml.v2 v2.2.2
+)

go.sum

@@ -0,0 +1,73 @@
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+gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/eapache/channels.v1 v1.1.0 h1:5bGAyKKvyCTWjSj7mhefG6Lc68VyN4MH1v8/7OoeeB4=
+gopkg.in/eapache/channels.v1 v1.1.0/go.mod h1:BHIBujSvu9yMTrTYbTCjDD43gUhtmaOtTWDe7sTv1js=
+gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
+gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

hub/executor/executor.go

@@ -0,0 +1,140 @@
+package executor
+
+import (
+	"github.com/Dreamacro/clash/component/auth"
+	trie "github.com/Dreamacro/clash/component/domain-trie"
+	"github.com/Dreamacro/clash/config"
+	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/dns"
+	"github.com/Dreamacro/clash/log"
+	P "github.com/Dreamacro/clash/proxy"
+	authStore "github.com/Dreamacro/clash/proxy/auth"
+	T "github.com/Dreamacro/clash/tunnel"
+)
+
+// Parse config with default config path
+func Parse() (*config.Config, error) {
+	return ParseWithPath(C.Path.Config())
+}
+
+// ParseWithPath parse config with custom config path
+func ParseWithPath(path string) (*config.Config, error) {
+	return config.Parse(path)
+}
+
+// ApplyConfig dispatch configure to all parts
+func ApplyConfig(cfg *config.Config, force bool) {
+	updateUsers(cfg.Users)
+	if force {
+		updateGeneral(cfg.General)
+	}
+	updateProxies(cfg.Proxies)
+	updateRules(cfg.Rules)
+	updateDNS(cfg.DNS)
+	updateHosts(cfg.Hosts)
+	updateExperimental(cfg.Experimental)
+}
+
+func GetGeneral() *config.General {
+	ports := P.GetPorts()
+	authenticator := []string{}
+	if auth := authStore.Authenticator(); auth != nil {
+		authenticator = auth.Users()
+	}
+
+	general := &config.General{
+		Port:           ports.Port,
+		SocksPort:      ports.SocksPort,
+		RedirPort:      ports.RedirPort,
+		Authentication: authenticator,
+		AllowLan:       P.AllowLan(),
+		BindAddress:    P.BindAddress(),
+		Mode:           T.Instance().Mode(),
+		LogLevel:       log.Level(),
+	}
+
+	return general
+}
+
+func updateExperimental(c *config.Experimental) {
+	T.Instance().UpdateExperimental(c.IgnoreResolveFail)
+}
+
+func updateDNS(c *config.DNS) {
+	if c.Enable == false {
+		dns.DefaultResolver = nil
+		dns.ReCreateServer("", nil)
+		return
+	}
+	r := dns.New(dns.Config{
+		Main:         c.NameServer,
+		Fallback:     c.Fallback,
+		IPv6:         c.IPv6,
+		EnhancedMode: c.EnhancedMode,
+		Pool:         c.FakeIPRange,
+		FallbackFilter: dns.FallbackFilter{
+			GeoIP:  c.FallbackFilter.GeoIP,
+			IPCIDR: c.FallbackFilter.IPCIDR,
+		},
+	})
+	dns.DefaultResolver = r
+	if err := dns.ReCreateServer(c.Listen, r); err != nil {
+		log.Errorln("Start DNS server error: %s", err.Error())
+		return
+	}
+
+	if c.Listen != "" {
+		log.Infoln("DNS server listening at: %s", c.Listen)
+	}
+}
+
+func updateHosts(tree *trie.Trie) {
+	dns.DefaultHosts = tree
+}
+
+func updateProxies(proxies map[string]C.Proxy) {
+	tunnel := T.Instance()
+	oldProxies := tunnel.Proxies()
+
+	// close proxy group goroutine
+	for _, proxy := range oldProxies {
+		proxy.Destroy()
+	}
+
+	tunnel.UpdateProxies(proxies)
+}
+
+func updateRules(rules []C.Rule) {
+	T.Instance().UpdateRules(rules)
+}
+
+func updateGeneral(general *config.General) {
+	log.SetLevel(general.LogLevel)
+	T.Instance().SetMode(general.Mode)
+
+	allowLan := general.AllowLan
+	P.SetAllowLan(allowLan)
+
+	bindAddress := general.BindAddress
+	P.SetBindAddress(bindAddress)
+
+	if err := P.ReCreateHTTP(general.Port); err != nil {
+		log.Errorln("Start HTTP server error: %s", err.Error())
+	}
+
+	if err := P.ReCreateSocks(general.SocksPort); err != nil {
+		log.Errorln("Start SOCKS5 server error: %s", err.Error())
+	}
+
+	if err := P.ReCreateRedir(general.RedirPort); err != nil {
+		log.Errorln("Start Redir server error: %s", err.Error())
+	}
+}
+
+func updateUsers(users []auth.AuthUser) {
+	authenticator := auth.NewAuthenticator(users)
+	authStore.SetAuthenticator(authenticator)
+	if authenticator != nil {
+		log.Infoln("Authentication of local server updated")
+	}
+}

hub/hub.go

@@ -0,0 +1,25 @@
+package hub
+
+import (
+	"github.com/Dreamacro/clash/hub/executor"
+	"github.com/Dreamacro/clash/hub/route"
+)
+
+// Parse call at the beginning of clash
+func Parse() error {
+	cfg, err := executor.Parse()
+	if err != nil {
+		return err
+	}
+
+	if cfg.General.ExternalUI != "" {
+		route.SetUIPath(cfg.General.ExternalUI)
+	}
+
+	if cfg.General.ExternalController != "" {
+		go route.Start(cfg.General.ExternalController, cfg.General.Secret)
+	}
+
+	executor.ApplyConfig(cfg, true)
+	return nil
+}

hub/route/configs.go

@@ -0,0 +1,107 @@
+package route
+
+import (
+	"net/http"
+	"path/filepath"
+
+	"github.com/Dreamacro/clash/hub/executor"
+	"github.com/Dreamacro/clash/log"
+	P "github.com/Dreamacro/clash/proxy"
+	T "github.com/Dreamacro/clash/tunnel"
+
+	"github.com/go-chi/chi"
+	"github.com/go-chi/render"
+)
+
+func configRouter() http.Handler {
+	r := chi.NewRouter()
+	r.Get("/", getConfigs)
+	r.Put("/", updateConfigs)
+	r.Patch("/", patchConfigs)
+	return r
+}
+
+type configSchema struct {
+	Port        *int          `json:"port"`
+	SocksPort   *int          `json:"socks-port"`
+	RedirPort   *int          `json:"redir-port"`
+	AllowLan    *bool         `json:"allow-lan"`
+	BindAddress *string       `json:"bind-address"`
+	Mode        *T.Mode       `json:"mode"`
+	LogLevel    *log.LogLevel `json:"log-level"`
+}
+
+func getConfigs(w http.ResponseWriter, r *http.Request) {
+	general := executor.GetGeneral()
+	render.JSON(w, r, general)
+}
+
+func pointerOrDefault(p *int, def int) int {
+	if p != nil {
+		return *p
+	}
+
+	return def
+}
+
+func patchConfigs(w http.ResponseWriter, r *http.Request) {
+	general := &configSchema{}
+	if err := render.DecodeJSON(r.Body, general); err != nil {
+		render.Status(r, http.StatusBadRequest)
+		render.JSON(w, r, ErrBadRequest)
+		return
+	}
+
+	if general.AllowLan != nil {
+		P.SetAllowLan(*general.AllowLan)
+	}
+
+	if general.BindAddress != nil {
+		P.SetBindAddress(*general.BindAddress)
+	}
+
+	ports := P.GetPorts()
+	P.ReCreateHTTP(pointerOrDefault(general.Port, ports.Port))
+	P.ReCreateSocks(pointerOrDefault(general.SocksPort, ports.SocksPort))
+	P.ReCreateRedir(pointerOrDefault(general.RedirPort, ports.RedirPort))
+
+	if general.Mode != nil {
+		T.Instance().SetMode(*general.Mode)
+	}
+
+	if general.LogLevel != nil {
+		log.SetLevel(*general.LogLevel)
+	}
+
+	render.NoContent(w, r)
+}
+
+type updateConfigRequest struct {
+	Path string `json:"path"`
+}
+
+func updateConfigs(w http.ResponseWriter, r *http.Request) {
+	req := updateConfigRequest{}
+	if err := render.DecodeJSON(r.Body, &req); err != nil {
+		render.Status(r, http.StatusBadRequest)
+		render.JSON(w, r, ErrBadRequest)
+		return
+	}
+
+	if !filepath.IsAbs(req.Path) {
+		render.Status(r, http.StatusBadRequest)
+		render.JSON(w, r, newError("path is not a absoluted path"))
+		return
+	}
+
+	force := r.URL.Query().Get("force") == "true"
+	cfg, err := executor.ParseWithPath(req.Path)
+	if err != nil {
+		render.Status(r, http.StatusBadRequest)
+		render.JSON(w, r, newError(err.Error()))
+		return
+	}
+
+	executor.ApplyConfig(cfg, force)
+	render.NoContent(w, r)
+}

hub/route/ctxkeys.go

@@ -0,0 +1,12 @@
+package route
+
+var (
+	CtxKeyProxyName = contextKey("proxy name")
+	CtxKeyProxy     = contextKey("proxy")
+)
+
+type contextKey string
+
+func (c contextKey) String() string {
+	return "clash context key " + string(c)
+}

hub/route/errors.go

@@ -0,0 +1,22 @@
+package route
+
+var (
+	ErrUnauthorized   = newError("Unauthorized")
+	ErrBadRequest     = newError("Body invalid")
+	ErrForbidden      = newError("Forbidden")
+	ErrNotFound       = newError("Resource not found")
+	ErrRequestTimeout = newError("Timeout")
+)
+
+// HTTPError is custom HTTP error for API
+type HTTPError struct {
+	Message string `json:"message"`
+}
+
+func (e *HTTPError) Error() string {
+	return e.Message
+}
+
+func newError(msg string) *HTTPError {
+	return &HTTPError{Message: msg}
+}

hub/route/proxies.go

@@ -0,0 +1,132 @@
+package route
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strconv"
+	"time"
+
+	A "github.com/Dreamacro/clash/adapters/outbound"
+	C "github.com/Dreamacro/clash/constant"
+	T "github.com/Dreamacro/clash/tunnel"
+
+	"github.com/go-chi/chi"
+	"github.com/go-chi/render"
+)
+
+func proxyRouter() http.Handler {
+	r := chi.NewRouter()
+	r.Get("/", getProxies)
+
+	r.Route("/{name}", func(r chi.Router) {
+		r.Use(parseProxyName, findProxyByName)
+		r.Get("/", getProxy)
+		r.Get("/delay", getProxyDelay)
+		r.Put("/", updateProxy)
+	})
+	return r
+}
+
+// When name is composed of a partial escape string, Golang does not unescape it
+func parseProxyName(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		name := chi.URLParam(r, "name")
+		if newName, err := url.PathUnescape(name); err == nil {
+			name = newName
+		}
+		ctx := context.WithValue(r.Context(), CtxKeyProxyName, name)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+func findProxyByName(next http.Handler) http.Handler {
+	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+		name := r.Context().Value(CtxKeyProxyName).(string)
+		proxies := T.Instance().Proxies()
+		proxy, exist := proxies[name]
+		if !exist {
+			render.Status(r, http.StatusNotFound)
+			render.JSON(w, r, ErrNotFound)
+			return
+		}
+
+		ctx := context.WithValue(r.Context(), CtxKeyProxy, proxy)
+		next.ServeHTTP(w, r.WithContext(ctx))
+	})
+}
+
+func getProxies(w http.ResponseWriter, r *http.Request) {
+	proxies := T.Instance().Proxies()
+	render.JSON(w, r, render.M{
+		"proxies": proxies,
+	})
+}
+
+func getProxy(w http.ResponseWriter, r *http.Request) {
+	proxy := r.Context().Value(CtxKeyProxy).(C.Proxy)
+	render.JSON(w, r, proxy)
+}
+
+type UpdateProxyRequest struct {
+	Name string `json:"name"`
+}
+
+func updateProxy(w http.ResponseWriter, r *http.Request) {
+	req := UpdateProxyRequest{}
+	if err := render.DecodeJSON(r.Body, &req); err != nil {
+		render.Status(r, http.StatusBadRequest)
+		render.JSON(w, r, ErrBadRequest)
+		return
+	}
+
+	proxy := r.Context().Value(CtxKeyProxy).(*A.Proxy)
+	selector, ok := proxy.ProxyAdapter.(*A.Selector)
+	if !ok {
+		render.Status(r, http.StatusBadRequest)
+		render.JSON(w, r, newError("Must be a Selector"))
+		return
+	}
+
+	if err := selector.Set(req.Name); err != nil {
+		render.Status(r, http.StatusBadRequest)
+		render.JSON(w, r, newError(fmt.Sprintf("Selector update error: %s", err.Error())))
+		return
+	}
+
+	render.NoContent(w, r)
+}
+
+func getProxyDelay(w http.ResponseWriter, r *http.Request) {
+	query := r.URL.Query()
+	url := query.Get("url")
+	timeout, err := strconv.ParseInt(query.Get("timeout"), 10, 16)
+	if err != nil {
+		render.Status(r, http.StatusBadRequest)
+		render.JSON(w, r, ErrBadRequest)
+		return
+	}
+
+	proxy := r.Context().Value(CtxKeyProxy).(C.Proxy)
+
+	ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond*time.Duration(timeout))
+	defer cancel()
+
+	delay, err := proxy.URLTest(ctx, url)
+	if ctx.Err() != nil {
+		render.Status(r, http.StatusGatewayTimeout)
+		render.JSON(w, r, ErrRequestTimeout)
+		return
+	}
+
+	if err != nil || delay == 0 {
+		render.Status(r, http.StatusServiceUnavailable)
+		render.JSON(w, r, newError("An error occurred in the delay test"))
+		return
+	}
+
+	render.JSON(w, r, render.M{
+		"delay": delay,
+	})
+}

hub/route/rules.go

@@ -0,0 +1,39 @@
+package route
+
+import (
+	"net/http"
+
+	T "github.com/Dreamacro/clash/tunnel"
+
+	"github.com/go-chi/chi"
+	"github.com/go-chi/render"
+)
+
+func ruleRouter() http.Handler {
+	r := chi.NewRouter()
+	r.Get("/", getRules)
+	return r
+}
+
+type Rule struct {
+	Type    string `json:"type"`
+	Payload string `json:"payload"`
+	Proxy   string `json:"proxy"`
+}
+
+func getRules(w http.ResponseWriter, r *http.Request) {
+	rawRules := T.Instance().Rules()
+
+	rules := []Rule{}
+	for _, rule := range rawRules {
+		rules = append(rules, Rule{
+			Type:    rule.RuleType().String(),
+			Payload: rule.Payload(),
+			Proxy:   rule.Adapter(),
+		})
+	}
+
+	render.JSON(w, r, render.M{
+		"rules": rules,
+	})
+}

hub/route/server.go

@@ -0,0 +1,234 @@
+package route
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+	"strings"
+	"time"
+
+	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/log"
+	T "github.com/Dreamacro/clash/tunnel"
+
+	"github.com/go-chi/chi"
+	"github.com/go-chi/cors"
+	"github.com/go-chi/render"
+	"github.com/gorilla/websocket"
+)
+
+var (
+	serverSecret = ""
+	serverAddr   = ""
+
+	uiPath = ""
+
+	upgrader = websocket.Upgrader{
+		CheckOrigin: func(r *http.Request) bool {
+			return true
+		},
+	}
+)
+
+type Traffic struct {
+	Up   int64 `json:"up"`
+	Down int64 `json:"down"`
+}
+
+func SetUIPath(path string) {
+	uiPath = path
+}
+
+func Start(addr string, secret string) {
+	if serverAddr != "" {
+		return
+	}
+
+	serverAddr = addr
+	serverSecret = secret
+
+	r := chi.NewRouter()
+
+	cors := cors.New(cors.Options{
+		AllowedOrigins: []string{"*"},
+		AllowedMethods: []string{"GET", "POST", "PUT", "PATCH", "DELETE"},
+		AllowedHeaders: []string{"Content-Type", "Authorization"},
+		MaxAge:         300,
+	})
+
+	r.Use(cors.Handler)
+	r.Get("/", hello)
+	r.Group(func(r chi.Router) {
+		r.Use(authentication)
+
+		r.Get("/logs", getLogs)
+		r.Get("/traffic", traffic)
+		r.Get("/version", version)
+		r.Mount("/configs", configRouter())
+		r.Mount("/proxies", proxyRouter())
+		r.Mount("/rules", ruleRouter())
+	})
+
+	if uiPath != "" {
+		r.Group(func(r chi.Router) {
+			fs := http.StripPrefix("/ui", http.FileServer(http.Dir(uiPath)))
+			r.Get("/ui", http.RedirectHandler("/ui/", http.StatusTemporaryRedirect).ServeHTTP)
+			r.Get("/ui/*", func(w http.ResponseWriter, r *http.Request) {
+				fs.ServeHTTP(w, r)
+			})
+		})
+	}
+
+	log.Infoln("RESTful API listening at: %s", addr)
+	err := http.ListenAndServe(addr, r)
+	if err != nil {
+		log.Errorln("External controller error: %s", err.Error())
+	}
+}
+
+func authentication(next http.Handler) http.Handler {
+	fn := func(w http.ResponseWriter, r *http.Request) {
+		if serverSecret == "" {
+			next.ServeHTTP(w, r)
+			return
+		}
+
+		// Browser websocket not support custom header
+		if websocket.IsWebSocketUpgrade(r) && r.URL.Query().Get("token") != "" {
+			token := r.URL.Query().Get("token")
+			if token != serverSecret {
+				render.Status(r, http.StatusUnauthorized)
+				render.JSON(w, r, ErrUnauthorized)
+				return
+			}
+			next.ServeHTTP(w, r)
+			return
+		}
+
+		header := r.Header.Get("Authorization")
+		text := strings.SplitN(header, " ", 2)
+
+		hasUnvalidHeader := text[0] != "Bearer"
+		hasUnvalidSecret := len(text) == 2 && text[1] != serverSecret
+		if hasUnvalidHeader || hasUnvalidSecret {
+			render.Status(r, http.StatusUnauthorized)
+			render.JSON(w, r, ErrUnauthorized)
+			return
+		}
+		next.ServeHTTP(w, r)
+	}
+	return http.HandlerFunc(fn)
+}
+
+func hello(w http.ResponseWriter, r *http.Request) {
+	render.JSON(w, r, render.M{"hello": "clash"})
+}
+
+func traffic(w http.ResponseWriter, r *http.Request) {
+	var wsConn *websocket.Conn
+	if websocket.IsWebSocketUpgrade(r) {
+		var err error
+		wsConn, err = upgrader.Upgrade(w, r, nil)
+		if err != nil {
+			return
+		}
+	}
+
+	if wsConn == nil {
+		w.Header().Set("Content-Type", "application/json")
+		render.Status(r, http.StatusOK)
+	}
+
+	tick := time.NewTicker(time.Second)
+	t := T.Instance().Traffic()
+	buf := &bytes.Buffer{}
+	var err error
+	for range tick.C {
+		buf.Reset()
+		up, down := t.Now()
+		if err := json.NewEncoder(buf).Encode(Traffic{
+			Up:   up,
+			Down: down,
+		}); err != nil {
+			break
+		}
+
+		if wsConn == nil {
+			_, err = w.Write(buf.Bytes())
+			w.(http.Flusher).Flush()
+		} else {
+			err = wsConn.WriteMessage(websocket.TextMessage, buf.Bytes())
+		}
+
+		if err != nil {
+			break
+		}
+	}
+}
+
+type Log struct {
+	Type    string `json:"type"`
+	Payload string `json:"payload"`
+}
+
+func getLogs(w http.ResponseWriter, r *http.Request) {
+	levelText := r.URL.Query().Get("level")
+	if levelText == "" {
+		levelText = "info"
+	}
+
+	level, ok := log.LogLevelMapping[levelText]
+	if !ok {
+		render.Status(r, http.StatusBadRequest)
+		render.JSON(w, r, ErrBadRequest)
+		return
+	}
+
+	var wsConn *websocket.Conn
+	if websocket.IsWebSocketUpgrade(r) {
+		var err error
+		wsConn, err = upgrader.Upgrade(w, r, nil)
+		if err != nil {
+			return
+		}
+	}
+
+	if wsConn == nil {
+		w.Header().Set("Content-Type", "application/json")
+		render.Status(r, http.StatusOK)
+	}
+
+	sub := log.Subscribe()
+	defer log.UnSubscribe(sub)
+	buf := &bytes.Buffer{}
+	var err error
+	for elm := range sub {
+		buf.Reset()
+		log := elm.(*log.Event)
+		if log.LogLevel < level {
+			continue
+		}
+
+		if err := json.NewEncoder(buf).Encode(Log{
+			Type:    log.Type(),
+			Payload: log.Payload,
+		}); err != nil {
+			break
+		}
+
+		if wsConn == nil {
+			_, err = w.Write(buf.Bytes())
+			w.(http.Flusher).Flush()
+		} else {
+			err = wsConn.WriteMessage(websocket.TextMessage, buf.Bytes())
+		}
+
+		if err != nil {
+			break
+		}
+	}
+}
+
+func version(w http.ResponseWriter, r *http.Request) {
+	render.JSON(w, r, render.M{"version": C.Version})
+}

hub/server.go

@@ -1,83 +0,0 @@
-package hub
-
-import (
-	"encoding/json"
-	"net/http"
-	"time"
-
-	"github.com/Dreamacro/clash/tunnel"
-
-	"github.com/go-chi/chi"
-	"github.com/go-chi/render"
-	log "github.com/sirupsen/logrus"
-)
-
-var (
-	tun = tunnel.GetInstance()
-)
-
-type Traffic struct {
-	Up   int64 `json:"up"`
-	Down int64 `json:"down"`
-}
-
-type Log struct {
-	Type    string `json:"type"`
-	Payload string `json:"payload"`
-}
-
-type Error struct {
-	Error string `json:"error"`
-}
-
-func NewHub(addr string) {
-	r := chi.NewRouter()
-
-	r.Get("/traffic", traffic)
-	r.Get("/logs", getLogs)
-
-	err := http.ListenAndServe(addr, r)
-	if err != nil {
-		log.Fatalf("External controller error: %s", err.Error())
-	}
-}
-
-func traffic(w http.ResponseWriter, r *http.Request) {
-	render.Status(r, http.StatusOK)
-
-	tick := time.NewTicker(time.Second)
-	t := tun.Traffic()
-	for range tick.C {
-		up, down := t.Now()
-		if err := json.NewEncoder(w).Encode(Traffic{
-			Up:   up,
-			Down: down,
-		}); err != nil {
-			break
-		}
-		w.(http.Flusher).Flush()
-	}
-}
-
-func getLogs(w http.ResponseWriter, r *http.Request) {
-	src := tun.Log()
-	sub, err := src.Subscribe()
-	defer src.UnSubscribe(sub)
-	if err != nil {
-		render.Status(r, http.StatusInternalServerError)
-		render.JSON(w, r, Error{
-			Error: err.Error(),
-		})
-	}
-	render.Status(r, http.StatusOK)
-	for elm := range sub {
-		log := elm.(tunnel.Log)
-		if err := json.NewEncoder(w).Encode(Log{
-			Type:    log.Type(),
-			Payload: log.Payload,
-		}); err != nil {
-			break
-		}
-		w.(http.Flusher).Flush()
-	}
-}

log/level.go

@@ -0,0 +1,73 @@
+package log
+
+import (
+	"encoding/json"
+	"errors"
+)
+
+var (
+	// LogLevelMapping is a mapping for LogLevel enum
+	LogLevelMapping = map[string]LogLevel{
+		ERROR.String():   ERROR,
+		WARNING.String(): WARNING,
+		INFO.String():    INFO,
+		DEBUG.String():   DEBUG,
+		SILENT.String():  SILENT,
+	}
+)
+
+const (
+	DEBUG LogLevel = iota
+	INFO
+	WARNING
+	ERROR
+	SILENT
+)
+
+type LogLevel int
+
+// UnmarshalYAML unserialize LogLevel with yaml
+func (l *LogLevel) UnmarshalYAML(unmarshal func(interface{}) error) error {
+	var tp string
+	unmarshal(&tp)
+	level, exist := LogLevelMapping[tp]
+	if !exist {
+		return errors.New("invalid mode")
+	}
+	*l = level
+	return nil
+}
+
+// UnmarshalJSON unserialize LogLevel with json
+func (l *LogLevel) UnmarshalJSON(data []byte) error {
+	var tp string
+	json.Unmarshal(data, &tp)
+	level, exist := LogLevelMapping[tp]
+	if !exist {
+		return errors.New("invalid mode")
+	}
+	*l = level
+	return nil
+}
+
+// MarshalJSON serialize LogLevel with json
+func (l LogLevel) MarshalJSON() ([]byte, error) {
+	return json.Marshal(l.String())
+}
+
+func (l LogLevel) String() string {
+	switch l {
+	case INFO:
+		return "info"
+	case WARNING:
+		return "warning"
+	case ERROR:
+		return "error"
+	case DEBUG:
+		return "debug"
+	case SILENT:
+		return "silent"
+	default:
+		return "unknown"
+	}
+}

log/log.go

@@ -0,0 +1,100 @@
+package log
+
+import (
+	"fmt"
+	"os"
+
+	"github.com/Dreamacro/clash/common/observable"
+
+	log "github.com/sirupsen/logrus"
+)
+
+var (
+	logCh  = make(chan interface{})
+	source = observable.NewObservable(logCh)
+	level  = INFO
+)
+
+func init() {
+	log.SetOutput(os.Stdout)
+	log.SetLevel(log.DebugLevel)
+}
+
+type Event struct {
+	LogLevel LogLevel
+	Payload  string
+}
+
+func (e *Event) Type() string {
+	return e.LogLevel.String()
+}
+
+func Infoln(format string, v ...interface{}) {
+	event := newLog(INFO, format, v...)
+	logCh <- event
+	print(event)
+}
+
+func Warnln(format string, v ...interface{}) {
+	event := newLog(WARNING, format, v...)
+	logCh <- event
+	print(event)
+}
+
+func Errorln(format string, v ...interface{}) {
+	event := newLog(ERROR, format, v...)
+	logCh <- event
+	print(event)
+}
+
+func Debugln(format string, v ...interface{}) {
+	event := newLog(DEBUG, format, v...)
+	logCh <- event
+	print(event)
+}
+
+func Fatalln(format string, v ...interface{}) {
+	log.Fatalf(format, v...)
+}
+
+func Subscribe() observable.Subscription {
+	sub, _ := source.Subscribe()
+	return sub
+}
+
+func UnSubscribe(sub observable.Subscription) {
+	source.UnSubscribe(sub)
+	return
+}
+
+func Level() LogLevel {
+	return level
+}
+
+func SetLevel(newLevel LogLevel) {
+	level = newLevel
+}
+
+func print(data *Event) {
+	if data.LogLevel < level {
+		return
+	}
+
+	switch data.LogLevel {
+	case INFO:
+		log.Infoln(data.Payload)
+	case WARNING:
+		log.Warnln(data.Payload)
+	case ERROR:
+		log.Errorln(data.Payload)
+	case DEBUG:
+		log.Debugln(data.Payload)
+	}
+}
+
+func newLog(logLevel LogLevel, format string, v ...interface{}) *Event {
+	return &Event{
+		LogLevel: logLevel,
+		Payload:  fmt.Sprintf(format, v...),
+	}
+}

main.go

@@ -1,48 +1,54 @@
 package main
 
 import (
+	"flag"
+	"fmt"
 	"os"
 	"os/signal"
+	"path/filepath"
+	"runtime"
 	"syscall"
 
+	"github.com/Dreamacro/clash/config"
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/hub"
-	"github.com/Dreamacro/clash/proxy/http"
-	"github.com/Dreamacro/clash/proxy/socks"
-	"github.com/Dreamacro/clash/tunnel"
 
 	log "github.com/sirupsen/logrus"
 )
 
+var (
+	version bool
+	homedir string
+)
+
+func init() {
+	flag.StringVar(&homedir, "d", "", "set configuration directory")
+	flag.BoolVar(&version, "v", false, "show current version of clash")
+	flag.Parse()
+}
+
 func main() {
-	cfg, err := C.GetConfig()
-	if err != nil {
-		log.Fatalf("Read config error: %s", err.Error())
+	if version {
+		fmt.Printf("Clash %s %s %s %s\n", C.Version, runtime.GOOS, runtime.GOARCH, C.BuildTime)
+		return
 	}
 
-	port, socksPort := C.DefalutHTTPPort, C.DefalutSOCKSPort
-	section := cfg.Section("General")
-	if key, err := section.GetKey("port"); err == nil {
-		port = key.Value()
+	if homedir != "" {
+		if !filepath.IsAbs(homedir) {
+			currentDir, _ := os.Getwd()
+			homedir = filepath.Join(currentDir, homedir)
+		}
+		C.SetHomeDir(homedir)
 	}
 
-	if key, err := section.GetKey("socks-port"); err == nil {
-		socksPort = key.Value()
+	if err := config.Init(C.Path.HomeDir()); err != nil {
+		log.Fatalf("Initial configuration directory error: %s", err.Error())
 	}
 
-	err = tunnel.GetInstance().UpdateConfig()
-	if err != nil {
+	if err := hub.Parse(); err != nil {
 		log.Fatalf("Parse config error: %s", err.Error())
 	}
 
-	go http.NewHttpProxy(port)
-	go socks.NewSocksProxy(socksPort)
-
-	// Hub
-	if key, err := section.GetKey("external-controller"); err == nil {
-		go hub.NewHub(key.Value())
-	}
-
 	sigCh := make(chan os.Signal, 1)
 	signal.Notify(sigCh, syscall.SIGINT, syscall.SIGTERM)
 	<-sigCh

observable/iterable.go

@@ -1,18 +0,0 @@
-package observable
-
-import (
-	"errors"
-)
-
-type Iterable <-chan interface{}
-
-func NewIterable(any interface{}) (Iterable, error) {
-	switch any := any.(type) {
-	case chan interface{}:
-		return Iterable(any), nil
-	case <-chan interface{}:
-		return Iterable(any), nil
-	default:
-		return nil, errors.New("type error")
-	}
-}

observable/util.go

@@ -1,15 +0,0 @@
-package observable
-
-func mergeWithBytes(ch <-chan interface{}, buf []byte) chan interface{} {
-	out := make(chan interface{})
-	go func() {
-		defer close(out)
-		if len(buf) != 0 {
-			out <- buf
-		}
-		for elm := range ch {
-			out <- elm
-		}
-	}()
-	return out
-}