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

@@ -14,3 +14,9 @@ bin/*
 
 # dep
 vendor
+
+# GoLand
+.idea/*
+
+# macOS file
+.DS_Store

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 sudo: false
 go:
-  - '1.12'
+  - '1.13'
 install:
   - "go mod download"
 env:

Dockerfile

@@ -1,23 +1,18 @@
-FROM golang:latest as builder
+FROM golang:alpine as builder
 
-RUN wget http://geolite.maxmind.com/download/geoip/database/GeoLite2-Country.tar.gz -O /tmp/GeoLite2-Country.tar.gz && \
+RUN apk add --no-cache make git && \
+    wget http://geolite.maxmind.com/download/geoip/database/GeoLite2-Country.tar.gz -O /tmp/GeoLite2-Country.tar.gz && \
     tar zxvf /tmp/GeoLite2-Country.tar.gz -C /tmp && \
     mv /tmp/GeoLite2-Country_*/GeoLite2-Country.mmdb /Country.mmdb
-
 WORKDIR /clash-src
-
 COPY . /clash-src
-
 RUN go mod download && \
-    GOOS=linux GOARCH=amd64 CGO_ENABLED=0 go build -ldflags '-w -s' -o /clash
+    make linux-amd64 && \
+    mv ./bin/clash-linux-amd64 /clash
 
 FROM alpine:latest
 
 RUN apk add --no-cache ca-certificates
-
 COPY --from=builder /Country.mmdb /root/.config/clash/
 COPY --from=builder /clash /
-
-EXPOSE 7890 7891
-
 ENTRYPOINT ["/clash"]

Makefile

@@ -1,6 +1,6 @@
 NAME=clash
 BINDIR=bin
-VERSION=$(shell git describe --tags --long --dirty || echo "unkown version")
+VERSION=$(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)" \
@@ -16,7 +16,8 @@ PLATFORM_LIST = \
 	linux-armv8 \
 	linux-mips-softfloat \
 	linux-mips-hardfloat \
-	linux-mipsle \
+	linux-mipsle-softfloat \
+	linux-mipsle-hardfloat \
 	linux-mips64 \
 	linux-mips64le \
 	freebsd-386 \
@@ -55,8 +56,11 @@ linux-mips-softfloat:
 linux-mips-hardfloat:
 	GOARCH=mips GOMIPS=hardfloat GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
 
-linux-mipsle:
+linux-mipsle-softfloat:
-	GOARCH=mipsle GOOS=linux $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
+	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)-$@
@@ -81,7 +85,7 @@ zip_releases=$(addsuffix .zip, $(WINDOWS_ARCH_LIST))
 
 $(gz_releases): %.gz : %
 	chmod +x $(BINDIR)/$(NAME)-$(basename $@)
-	tar -czf $(BINDIR)/$(NAME)-$(basename $@)-$(VERSION).tar.gz -C $(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

README.md

@@ -20,40 +20,39 @@
 
 ## Features
 
-- HTTP/HTTPS and SOCKS protocol
+- Local HTTP/HTTPS/SOCKS server
-- Surge like configuration
+- Surge-like configuration format
 - GeoIP rule support
-- Support Vmess/Shadowsocks/Socks5
+- Supports Vmess, Shadowsocks, Snell and SOCKS5 protocol
-- Support for Netfilter TCP redirect
+- 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 >= 1.12.
+Check Clash version with:
-
-Checkout Clash version:
 
 ```sh
-clash -v
+$ clash -v
 ```
 
 ## Daemon
 
-Unfortunately, there is no native elegant way to implement golang's daemon.
+Unfortunately, there is no native and elegant way to implement daemons on Golang.
 
-So we can use third-party daemon tools like pm2, supervisor, and so on.
+So we can use third-party daemon tools like PM2, Supervisor or the like.
 
 In the case of [pm2](https://github.com/Unitech/pm2), we can start the daemon this way:
 
 ```sh
-pm2 start clash
+$ pm2 start clash
 ```
 
 If you have Docker installed, you can run clash directly using `docker-compose`.
@@ -62,19 +61,20 @@ If you have Docker installed, you can run clash directly using `docker-compose`.
 
 ## Config
 
-The default configuration directory is `$HOME/.config/clash`
+The default configuration directory is `$HOME/.config/clash`.
 
-The name of the configuration file is `config.yml`
+The name of the configuration file is `config.yaml`.
 
-If you want to use another directory, you can use `-d` to control the configuration directory
+If you want to use another directory, use `-d` to control the configuration directory.
 
-For example, you can use the current directory as the configuration directory
+For example, you can use the current directory as the configuration directory:
 
 ```sh
-clash -d .
+$ clash -d .
 ```
 
-Below is a simple demo configuration file:
+<details>
+  <summary>This is an example configuration file</summary>
 
 ```yml
 # port of HTTP
@@ -88,6 +88,12 @@ socks-port: 7891
 
 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
 
@@ -95,7 +101,7 @@ mode: Rule
 # info / warning / error / debug / silent
 log-level: info
 
-# A RESTful API for clash
+# 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`
@@ -105,31 +111,61 @@ external-controller: 127.0.0.1:9090
 # 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
+  # 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 types of cipher are consistent with go-shadowsocks2
+# The supported ciphers(encrypt methods):
-# 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
+#   aes-128-gcm aes-192-gcm aes-256-gcm
-# In addition to what go-shadowsocks2 supports, it also supports chacha20 rc4-md5 xchacha20-ietf-poly1305
+#   aes-128-cfb aes-192-cfb aes-256-cfb
-- { name: "ss1", type: ss, server: server, port: 443, cipher: AEAD_CHACHA20_POLY1305, password: "password" }
+#   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 remove after prerelease
+# old obfs configuration format remove after prerelease
 - name: "ss2"
   type: ss
   server: server
   port: 443
-  cipher: AEAD_CHACHA20_POLY1305
+  cipher: chacha20-ietf-poly1305
   password: "password"
   plugin: obfs
   plugin-opts:
@@ -140,7 +176,7 @@ Proxy:
   type: ss
   server: server
   port: 443
-  cipher: AEAD_CHACHA20_POLY1305
+  cipher: chacha20-ietf-poly1305
   password: "password"
   plugin: v2ray-plugin
   plugin-opts:
@@ -149,52 +185,98 @@ Proxy:
     # 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 }
+- name: "vmess"
-# with tls
+  type: vmess
-- { name: "vmess", type: vmess, server: server, port: 443, uuid: uuid, alterId: 32, cipher: auto, tls: true }
+  server: server
-# with tls and skip-cert-verify
+  port: 443
-- { name: "vmess", type: vmess, server: server, port: 443, uuid: uuid, alterId: 32, cipher: auto, tls: true, skip-cert-verify: true }
+  uuid: uuid
-# with ws-path and ws-headers
+  alterId: 32
-- { name: "vmess", type: vmess, server: server, port: 443, uuid: uuid, alterId: 32, cipher: auto, network: ws, ws-path: /path, ws-headers: { Host: v2ray.com } }
+  cipher: auto
-# with ws + tls
+  # udp: true
-- { name: "vmess", type: vmess, server: server, port: 443, uuid: uuid, alterId: 32, cipher: auto, network: ws, ws-path: /path, tls: 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 }
+- name: "socks"
-# socks5 with authentication
+  type: socks5
-- { name: "socks", type: socks5, server: server, port: 443, username: "username", password: "password" }
+  server: server
-# with tls
+  port: 443
-- { name: "socks", type: socks5, server: server, port: 443, tls: true }
+  # username: username
-# with tls and skip-cert-verify
+  # password: password
-- { name: "socks", type: socks5, server: server, port: 443, tls: true, skip-cert-verify: true }
+  # tls: true
+  # skip-cert-verify: true
+  # udp: true
 
 # http
-- { name: "http", type: http, server: server, port: 443 }
+- name: "http"
-# http with authentication
+  type: http
-- { name: "http", type: http, server: server, port: 443, username: "username", password: "password" }
+  server: server
-# with tls (https)
+  port: 443
-- { name: "http", type: http, server: server, port: 443, tls: true }
+  # username: username
-# with tls (https) and skip-cert-verify
+  # password: password
-- { name: "http", type: http, server: server, port: 443, tls: true, skip-cert-verify: true }
+  # 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 }
+- 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 }
+- 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 }
+- name: "load-balance"
+  type: load-balance
+  proxies:
+    - ss1
+    - ss2
+    - vmess1
+  url: 'http://www.gstatic.com/generate_204'
+  interval: 300
 
 # select is used for selecting proxy or proxy group
 # you can use RESTful API to switch proxy, is recommended for use in GUI.
-- { name: "Proxy", type: select, proxies: ["ss1", "ss2", "vmess1", "auto"] }
+- name: Proxy
+  type: select
+  proxies:
+    - ss1
+    - ss2
+    - vmess1
+    - auto
 
 Rule:
 - DOMAIN-SUFFIX,google.com,auto
@@ -202,12 +284,19 @@ Rule:
 - DOMAIN,google.com,auto
 - DOMAIN-SUFFIX,ad.com,REJECT
 - IP-CIDR,127.0.0.0/8,DIRECT
-- SOURCE-IP-CIDR,192.168.1.201/32,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
 
@@ -223,5 +312,5 @@ Rule:
 
 - [x] Complementing the necessary rule operators
 - [x] Redir proxy
-- [ ] UDP support
+- [x] UDP support
 - [ ] Connection manager

adapters/inbound/http.go

@@ -10,34 +10,27 @@ import (
 
 // HTTPAdapter is a adapter for HTTP connection
 type HTTPAdapter struct {
+	net.Conn
 	metadata *C.Metadata
-	conn     net.Conn
 	R        *http.Request
 }
 
-// Close HTTP connection
-func (h *HTTPAdapter) Close() {
-	h.conn.Close()
-}
-
 // Metadata return destination metadata
 func (h *HTTPAdapter) Metadata() *C.Metadata {
 	return h.metadata
 }
 
-// Conn return raw net.Conn of HTTP
-func (h *HTTPAdapter) Conn() net.Conn {
-	return h.conn
-}
-
 // NewHTTP is HTTPAdapter generator
 func NewHTTP(request *http.Request, conn net.Conn) *HTTPAdapter {
 	metadata := parseHTTPAddr(request)
-	metadata.SourceIP = parseSourceIP(conn)
+	if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {
+		metadata.SrcIP = ip
+		metadata.SrcPort = port
+	}
 	return &HTTPAdapter{
 		metadata: metadata,
 		R:        request,
-		conn:     conn,
+		Conn:     conn,
 	}
 }
 

adapters/inbound/https.go

@@ -8,9 +8,12 @@ import (
 // NewHTTPS is HTTPAdapter generator
 func NewHTTPS(request *http.Request, conn net.Conn) *SocketAdapter {
 	metadata := parseHTTPAddr(request)
-	metadata.SourceIP = parseSourceIP(conn)
+	if ip, port, err := parseAddr(conn.RemoteAddr().String()); err == nil {
+		metadata.SrcIP = ip
+		metadata.SrcPort = port
+	}
 	return &SocketAdapter{
 		metadata: metadata,
-		conn:     conn,
+		Conn:     conn,
 	}
 }

adapters/inbound/socket.go

@@ -3,39 +3,33 @@ package adapters
 import (
 	"net"
 
+	"github.com/Dreamacro/clash/component/socks5"
 	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/go-shadowsocks2/socks"
 )
 
 // SocketAdapter is a adapter for socks and redir connection
 type SocketAdapter struct {
-	conn     net.Conn
+	net.Conn
 	metadata *C.Metadata
 }
 
-// Close socks and redir connection
-func (s *SocketAdapter) Close() {
-	s.conn.Close()
-}
-
 // Metadata return destination metadata
 func (s *SocketAdapter) Metadata() *C.Metadata {
 	return s.metadata
 }
 
-// Conn return raw net.Conn
+// NewSocket is SocketAdapter generator
-func (s *SocketAdapter) Conn() net.Conn {
+func NewSocket(target socks5.Addr, conn net.Conn, source C.Type, netType C.NetWork) *SocketAdapter {
-	return s.conn
+	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
 	}
 
-// NewSocket is SocketAdapter generator
-func NewSocket(target socks.Addr, conn net.Conn, source C.SourceType) *SocketAdapter {
-	metadata := parseSocksAddr(target)
-	metadata.Source = source
-	metadata.SourceIP = parseSourceIP(conn)
-
 	return &SocketAdapter{
-		conn:     conn,
+		Conn:     conn,
 		metadata: metadata,
 	}
 }

adapters/inbound/util.go

@@ -5,28 +5,27 @@ import (
 	"net/http"
 	"strconv"
 
+	"github.com/Dreamacro/clash/component/socks5"
 	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/go-shadowsocks2/socks"
 )
 
-func parseSocksAddr(target socks.Addr) *C.Metadata {
+func parseSocksAddr(target socks5.Addr) *C.Metadata {
 	metadata := &C.Metadata{
-		NetWork:  C.TCP,
 		AddrType: int(target[0]),
 	}
 
 	switch target[0] {
-	case socks.AtypDomainName:
+	case socks5.AtypDomainName:
 		metadata.Host = string(target[2 : 2+target[1]])
-		metadata.Port = strconv.Itoa((int(target[2+target[1]]) << 8) | int(target[2+target[1]+1]))
+		metadata.DstPort = strconv.Itoa((int(target[2+target[1]]) << 8) | int(target[2+target[1]+1]))
-	case socks.AtypIPv4:
+	case socks5.AtypIPv4:
 		ip := net.IP(target[1 : 1+net.IPv4len])
-		metadata.IP = &ip
+		metadata.DstIP = &ip
-		metadata.Port = strconv.Itoa((int(target[1+net.IPv4len]) << 8) | int(target[1+net.IPv4len+1]))
+		metadata.DstPort = strconv.Itoa((int(target[1+net.IPv4len]) << 8) | int(target[1+net.IPv4len+1]))
-	case socks.AtypIPv6:
+	case socks5.AtypIPv6:
 		ip := net.IP(target[1 : 1+net.IPv6len])
-		metadata.IP = &ip
+		metadata.DstIP = &ip
-		metadata.Port = strconv.Itoa((int(target[1+net.IPv6len]) << 8) | int(target[1+net.IPv6len+1]))
+		metadata.DstPort = strconv.Itoa((int(target[1+net.IPv6len]) << 8) | int(target[1+net.IPv6len+1]))
 	}
 
 	return metadata
@@ -41,11 +40,11 @@ func parseHTTPAddr(request *http.Request) *C.Metadata {
 
 	metadata := &C.Metadata{
 		NetWork:  C.TCP,
-		Source:   C.HTTP,
+		Type:     C.HTTP,
 		AddrType: C.AtypDomainName,
 		Host:     host,
-		IP:       nil,
+		DstIP:    nil,
-		Port:     port,
+		DstPort:  port,
 	}
 
 	ip := net.ParseIP(host)
@@ -56,15 +55,18 @@ func parseHTTPAddr(request *http.Request) *C.Metadata {
 		default:
 			metadata.AddrType = C.AtypIPv4
 		}
-		metadata.IP = &ip
+		metadata.DstIP = &ip
 	}
 
 	return metadata
 }
 
-func parseSourceIP(conn net.Conn) *net.IP {
+func parseAddr(addr string) (*net.IP, string, error) {
-	if addr, ok := conn.RemoteAddr().(*net.TCPAddr); ok {
+	host, port, err := net.SplitHostPort(addr)
-		return &addr.IP
+	if err != nil {
+		return nil, "", err
 	}
-	return nil
+
+	ip := net.ParseIP(host)
+	return &ip, port, nil
 }

adapters/outbound/base.go

@@ -1,7 +1,9 @@
 package adapters
 
 import (
+	"context"
 	"encoding/json"
+	"errors"
 	"net"
 	"net/http"
 	"time"
@@ -10,9 +12,14 @@ import (
 	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 {
@@ -23,6 +30,14 @@ 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) {
@@ -31,6 +46,40 @@ func (b *Base) MarshalJSON() ([]byte, error) {
 	})
 }
 
+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
@@ -41,8 +90,14 @@ func (p *Proxy) Alive() bool {
 	return p.alive
 }
 
-func (p *Proxy) Dial(metadata *C.Metadata) (net.Conn, error) {
+func (p *Proxy) Dial(metadata *C.Metadata) (C.Conn, error) {
-	conn, err := p.ProxyAdapter.Dial(metadata)
+	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
 	}
@@ -58,18 +113,18 @@ func (p *Proxy) DelayHistory() []C.DelayHistory {
 	return histories
 }
 
-// LastDelay return last history record. if proxy is not alive, return the max value of int16.
+// 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
 	}
 
-	head := p.history.First()
+	last := p.history.Last()
-	if head == nil {
+	if last == nil {
 		return max
 	}
-	history := head.(C.DelayHistory)
+	history := last.(C.DelayHistory)
 	if history.Delay == 0 {
 		return max
 	}
@@ -89,7 +144,7 @@ func (p *Proxy) MarshalJSON() ([]byte, error) {
 }
 
 // URLTest get the delay for the specified URL
-func (p *Proxy) URLTest(url string) (t uint16, err error) {
+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()}
@@ -108,11 +163,18 @@ func (p *Proxy) URLTest(url string) (t uint16, err error) {
 	}
 
 	start := time.Now()
-	instance, err := p.Dial(&addr)
+	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
@@ -123,8 +185,9 @@ func (p *Proxy) URLTest(url string) (t uint16, err error) {
 		TLSHandshakeTimeout:   10 * time.Second,
 		ExpectContinueTimeout: 1 * time.Second,
 	}
+
 	client := http.Client{Transport: transport}
-	resp, err := client.Get(url)
+	resp, err := client.Do(req)
 	if err != nil {
 		return
 	}
@@ -136,3 +199,9 @@ func (p *Proxy) URLTest(url string) (t uint16, err error) {
 func NewProxy(adapter C.ProxyAdapter) *Proxy {
 	return &Proxy{adapter, queue.New(10), true}
 }
+
+// ProxyGroupOption contain the common options for all kind of ProxyGroup
+type ProxyGroupOption struct {
+	Name    string   `proxy:"name"`
+	Proxies []string `proxy:"proxies"`
+}

adapters/outbound/direct.go

@@ -1,6 +1,7 @@
 package adapters
 
 import (
+	"context"
 	"net"
 
 	C "github.com/Dreamacro/clash/constant"
@@ -10,18 +11,31 @@ type Direct struct {
 	*Base
 }
 
-func (d *Direct) Dial(metadata *C.Metadata) (net.Conn, error) {
+func (d *Direct) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	address := net.JoinHostPort(metadata.Host, metadata.Port)
+	address := net.JoinHostPort(metadata.Host, metadata.DstPort)
-	if metadata.IP != nil {
+	if metadata.DstIP != nil {
-		address = net.JoinHostPort(metadata.IP.String(), metadata.Port)
+		address = net.JoinHostPort(metadata.DstIP.String(), metadata.DstPort)
 	}
 
-	c, err := net.DialTimeout("tcp", address, tcpTimeout)
+	c, err := dialContext(ctx, "tcp", address)
 	if err != nil {
 		return nil, err
 	}
 	tcpKeepAlive(c)
-	return c, nil
+	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 {
@@ -29,6 +43,7 @@ func NewDirect() *Direct {
 		Base: &Base{
 			name: "DIRECT",
 			tp:   C.Direct,
+			udp:  true,
 		},
 	}
 }

adapters/outbound/fallback.go

@@ -1,6 +1,7 @@
 package adapters
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"net"
@@ -30,9 +31,27 @@ func (f *Fallback) Now() string {
 	return proxy.Name()
 }
 
-func (f *Fallback) Dial(metadata *C.Metadata) (net.Conn, error) {
+func (f *Fallback) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
 	proxy := f.findAliveProxy()
-	return proxy.Dial(metadata)
+	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) {
@@ -80,7 +99,7 @@ func (f *Fallback) validTest() {
 
 	for _, p := range f.proxies {
 		go func(p C.Proxy) {
-			p.URLTest(f.rawURL)
+			p.URLTest(context.Background(), f.rawURL)
 			wg.Done()
 		}(p)
 	}

adapters/outbound/http.go

@@ -3,6 +3,7 @@ package adapters
 import (
 	"bufio"
 	"bytes"
+	"context"
 	"crypto/tls"
 	"encoding/base64"
 	"errors"
@@ -35,8 +36,8 @@ type HttpOption struct {
 	SkipCertVerify bool   `proxy:"skip-cert-verify,omitempty"`
 }
 
-func (h *Http) Dial(metadata *C.Metadata) (net.Conn, error) {
+func (h *Http) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := net.DialTimeout("tcp", h.addr, tcpTimeout)
+	c, err := dialContext(ctx, "tcp", h.addr)
 	if err == nil && h.tls {
 		cc := tls.Client(c, h.tlsConfig)
 		err = cc.Handshake()
@@ -51,14 +52,14 @@ func (h *Http) Dial(metadata *C.Metadata) (net.Conn, error) {
 		return nil, err
 	}
 
-	return c, nil
+	return newConn(c, h), nil
 }
 
 func (h *Http) shakeHand(metadata *C.Metadata, rw io.ReadWriter) error {
 	var buf bytes.Buffer
 	var err error
 
-	addr := net.JoinHostPort(metadata.String(), metadata.Port)
+	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")
@@ -81,17 +82,21 @@ func (h *Http) shakeHand(metadata *C.Metadata, rw io.ReadWriter) error {
 		return err
 	}
 
-	if resp.StatusCode == 200 {
+	if resp.StatusCode == http.StatusOK {
 		return nil
 	}
 
-	if resp.StatusCode == 407 {
+	if resp.StatusCode == http.StatusProxyAuthRequired {
 		return errors.New("HTTP need auth")
 	}
 
-	if resp.StatusCode == 405 {
+	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)
 }
 

adapters/outbound/loadbalance.go

@@ -1,6 +1,7 @@
 package adapters
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"net"
@@ -34,11 +35,11 @@ func getKey(metadata *C.Metadata) string {
 		}
 	}
 
-	if metadata.IP == nil {
+	if metadata.DstIP == nil {
 		return ""
 	}
 
-	return metadata.IP.String()
+	return metadata.DstIP.String()
 }
 
 func jumpHash(key uint64, buckets int32) int32 {
@@ -53,18 +54,49 @@ func jumpHash(key uint64, buckets int32) int32 {
 	return int32(b)
 }
 
-func (lb *LoadBalance) Dial(metadata *C.Metadata) (net.Conn, error) {
+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() {
-			return proxy.Dial(metadata)
+			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].Dial(metadata)
+	return lb.proxies[0].DialUDP(metadata)
+}
+
+func (lb *LoadBalance) SupportUDP() bool {
+	return true
 }
 
 func (lb *LoadBalance) Destroy() {
@@ -77,7 +109,7 @@ func (lb *LoadBalance) validTest() {
 
 	for _, p := range lb.proxies {
 		go func(p C.Proxy) {
-			p.URLTest(lb.rawURL)
+			p.URLTest(context.Background(), lb.rawURL)
 			wg.Done()
 		}(p)
 	}

adapters/outbound/reject.go

@@ -1,6 +1,7 @@
 package adapters
 
 import (
+	"context"
 	"io"
 	"net"
 	"time"
@@ -12,8 +13,8 @@ type Reject struct {
 	*Base
 }
 
-func (r *Reject) Dial(metadata *C.Metadata) (net.Conn, error) {
+func (r *Reject) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	return &NopConn{}, nil
+	return newConn(&NopConn{}, r), nil
 }
 
 func NewReject() *Reject {

adapters/outbound/selector.go

@@ -1,10 +1,10 @@
 package adapters
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"net"
-	"sort"
 
 	C "github.com/Dreamacro/clash/constant"
 )
@@ -13,6 +13,7 @@ type Selector struct {
 	*Base
 	selected  C.Proxy
 	proxies   map[string]C.Proxy
+	proxyList []string
 }
 
 type SelectorOption struct {
@@ -20,20 +21,31 @@ type SelectorOption struct {
 	Proxies []string `proxy:"proxies"`
 }
 
-func (s *Selector) Dial(metadata *C.Metadata) (net.Conn, error) {
+func (s *Selector) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	return s.selected.Dial(metadata)
+	c, err := s.selected.DialContext(ctx, metadata)
+	if err == nil {
+		c.AppendToChains(s)
+	}
+	return c, err
+}
+
+func (s *Selector) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
+	pc, addr, err := s.selected.DialUDP(metadata)
+	if err == nil {
+		pc.AppendToChains(s)
+	}
+	return pc, addr, err
+}
+
+func (s *Selector) SupportUDP() bool {
+	return s.selected.SupportUDP()
 }
 
 func (s *Selector) MarshalJSON() ([]byte, error) {
-	var all []string
-	for k := range s.proxies {
-		all = append(all, k)
-	}
-	sort.Strings(all)
 	return json.Marshal(map[string]interface{}{
 		"type": s.Type().String(),
 		"now":  s.Now(),
-		"all":  all,
+		"all":  s.proxyList,
 	})
 }
 
@@ -56,8 +68,10 @@ func NewSelector(name string, proxies []C.Proxy) (*Selector, error) {
 	}
 
 	mapping := make(map[string]C.Proxy)
-	for _, proxy := range proxies {
+	proxyList := make([]string, len(proxies))
+	for idx, proxy := range proxies {
 		mapping[proxy.Name()] = proxy
+		proxyList[idx] = proxy.Name()
 	}
 
 	s := &Selector{
@@ -67,6 +81,7 @@ func NewSelector(name string, proxies []C.Proxy) (*Selector, error) {
 		},
 		proxies:   mapping,
 		selected:  proxies[0],
+		proxyList: proxyList,
 	}
 	return s, nil
 }

adapters/outbound/shadowsocks.go

@@ -1,7 +1,7 @@
 package adapters
 
 import (
-	"bytes"
+	"context"
 	"crypto/tls"
 	"encoding/json"
 	"fmt"
@@ -10,11 +10,11 @@ import (
 
 	"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"
-	"github.com/Dreamacro/go-shadowsocks2/socks"
 )
 
 type ShadowSocks struct {
@@ -25,7 +25,7 @@ type ShadowSocks struct {
 	// obfs
 	obfsMode    string
 	obfsOption  *simpleObfsOption
-	wsOption   *v2rayObfs.WebsocketOption
+	v2rayOption *v2rayObfs.Option
 }
 
 type ShadowSocksOption struct {
@@ -34,6 +34,7 @@ type ShadowSocksOption struct {
 	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"`
 
@@ -54,10 +55,11 @@ type v2rayObfsOption struct {
 	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) Dial(metadata *C.Metadata) (net.Conn, error) {
+func (ss *ShadowSocks) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := net.DialTimeout("tcp", ss.server, tcpTimeout)
+	c, err := dialContext(ctx, "tcp", ss.server)
 	if err != nil {
 		return nil, fmt.Errorf("%s connect error: %s", ss.server, err.Error())
 	}
@@ -70,14 +72,34 @@ func (ss *ShadowSocks) Dial(metadata *C.Metadata) (net.Conn, error) {
 		c = obfs.NewHTTPObfs(c, ss.obfsOption.Host, port)
 	case "websocket":
 		var err error
-		c, err = v2rayObfs.NewWebsocketObfs(c, ss.wsOption)
+		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 c, err
+	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) {
@@ -95,7 +117,7 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
 		return nil, fmt.Errorf("ss %s initialize error: %s", server, err.Error())
 	}
 
-	var wsOption *v2rayObfs.WebsocketOption
+	var v2rayOption *v2rayObfs.Option
 	var obfsOption *simpleObfsOption
 	obfsMode := ""
 
@@ -116,14 +138,23 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
 		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"}
+		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{
@@ -132,11 +163,12 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
 				ClientSessionCache: getClientSessionCache(),
 			}
 		}
-		wsOption = &v2rayObfs.WebsocketOption{
+		v2rayOption = &v2rayObfs.Option{
 			Host:      opts.Host,
 			Path:      opts.Path,
 			Headers:   opts.Headers,
 			TLSConfig: tlsConfig,
+			Mux:       opts.Mux,
 		}
 	}
 
@@ -144,32 +176,33 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
 		Base: &Base{
 			name: option.Name,
 			tp:   C.Shadowsocks,
+			udp:  option.UDP,
 		},
 		server: server,
 		cipher: ciph,
 
 		obfsMode:    obfsMode,
-		wsOption:   wsOption,
+		v2rayOption: v2rayOption,
 		obfsOption:  obfsOption,
 	}, nil
 }
 
-func serializesSocksAddr(metadata *C.Metadata) []byte {
+type ssUDPConn struct {
-	var buf [][]byte
+	net.PacketConn
-	aType := uint8(metadata.AddrType)
+	rAddr socks5.Addr
-	p, _ := strconv.Atoi(metadata.Port)
-	port := []byte{uint8(p >> 8), uint8(p & 0xff)}
-	switch metadata.AddrType {
-	case socks.AtypDomainName:
-		len := uint8(len(metadata.Host))
-		host := []byte(metadata.Host)
-		buf = [][]byte{{aType, len}, host, port}
-	case socks.AtypIPv4:
-		host := metadata.IP.To4()
-		buf = [][]byte{{aType}, host, port}
-	case socks.AtypIPv6:
-		host := metadata.IP.To16()
-		buf = [][]byte{{aType}, host, port}
 }
-	return bytes.Join(buf, nil)
+
+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

@@ -1,17 +1,16 @@
 package adapters
 
 import (
-	"bytes"
+	"context"
 	"crypto/tls"
-	"errors"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"net"
 	"strconv"
 
+	"github.com/Dreamacro/clash/component/socks5"
 	C "github.com/Dreamacro/clash/constant"
-
-	"github.com/Dreamacro/go-shadowsocks2/socks"
 )
 
 type Socks5 struct {
@@ -31,11 +30,12 @@ type Socks5Option struct {
 	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) Dial(metadata *C.Metadata) (net.Conn, error) {
+func (ss *Socks5) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := net.DialTimeout("tcp", ss.addr, tcpTimeout)
+	c, err := dialContext(ctx, "tcp", ss.addr)
 
 	if err == nil && ss.tls {
 		cc := tls.Client(c, ss.tlsConfig)
@@ -47,69 +47,79 @@ func (ss *Socks5) Dial(metadata *C.Metadata) (net.Conn, error) {
 		return nil, fmt.Errorf("%s connect error", ss.addr)
 	}
 	tcpKeepAlive(c)
-	if err := ss.shakeHand(metadata, c); err != nil {
+	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 c, nil
+	return newConn(c, ss), nil
 }
 
-func (ss *Socks5) shakeHand(metadata *C.Metadata, rw io.ReadWriter) error {
+func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, _ net.Addr, err error) {
-	buf := make([]byte, socks.MaxAddrLen)
+	ctx, cancel := context.WithTimeout(context.Background(), tcpTimeout)
-	var err error
+	defer cancel()
-
+	c, err := dialContext(ctx, "tcp", ss.addr)
-	// VER, NMETHODS, METHODS
-	if len(ss.user) > 0 {
-		_, err = rw.Write([]byte{5, 1, 2})
-	} else {
-		_, err = rw.Write([]byte{5, 1, 0})
-	}
 	if err != nil {
-		return err
+		err = fmt.Errorf("%s connect error", ss.addr)
+		return
 	}
 
-	// VER, METHOD
+	if ss.tls {
-	if _, err := io.ReadFull(rw, buf[:2]); err != nil {
+		cc := tls.Client(c, ss.tlsConfig)
-		return err
+		err = cc.Handshake()
+		c = cc
 	}
 
-	if buf[0] != 5 {
+	defer func() {
-		return errors.New("SOCKS version error")
+		if err != nil {
+			c.Close()
+		}
+	}()
+
+	tcpKeepAlive(c)
+	var user *socks5.User
+	if ss.user != "" {
+		user = &socks5.User{
+			Username: ss.user,
+			Password: ss.pass,
+		}
 	}
 
-	if buf[1] == 2 {
+	bindAddr, err := socks5.ClientHandshake(c, serializesSocksAddr(metadata), socks5.CmdUDPAssociate, user)
-		// password protocol version
+	if err != nil {
-		authMsg := &bytes.Buffer{}
+		err = fmt.Errorf("%v client hanshake error", err)
-		authMsg.WriteByte(1)
+		return
-		authMsg.WriteByte(uint8(len(ss.user)))
-		authMsg.WriteString(ss.user)
-		authMsg.WriteByte(uint8(len(ss.pass)))
-		authMsg.WriteString(ss.pass)
-
-		if _, err := rw.Write(authMsg.Bytes()); err != nil {
-			return err
 	}
 
-		if _, err := io.ReadFull(rw, buf[:2]); err != nil {
+	addr, err := net.ResolveUDPAddr("udp", bindAddr.String())
-			return err
+	if err != nil {
+		return
 	}
 
-		if buf[1] != 0 {
+	targetAddr := socks5.ParseAddr(metadata.RemoteAddress())
-			return errors.New("rejected username/password")
+	if targetAddr == nil {
-		}
+		return nil, nil, fmt.Errorf("parse address error: %v:%v", metadata.String(), metadata.DstPort)
-	} else if buf[1] != 0 {
-		return errors.New("SOCKS need auth")
 	}
 
-	// VER, CMD, RSV, ADDR
+	pc, err := net.ListenPacket("udp", "")
-	if _, err := rw.Write(bytes.Join([][]byte{{5, 1, 0}, serializesSocksAddr(metadata)}, []byte(""))); err != nil {
+	if err != nil {
-		return err
+		return
 	}
 
-	if _, err := io.ReadFull(rw, buf[:10]); err != nil {
+	go func() {
-		return err
+		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 nil
+	return newPacketConn(&socksUDPConn{PacketConn: pc, rAddr: targetAddr, tcpConn: c}, ss), addr, nil
 }
 
 func NewSocks5(option Socks5Option) *Socks5 {
@@ -126,6 +136,7 @@ func NewSocks5(option Socks5Option) *Socks5 {
 		Base: &Base{
 			name: option.Name,
 			tp:   C.Socks5,
+			udp:  option.UDP,
 		},
 		addr:           net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 		user:           option.UserName,
@@ -135,3 +146,37 @@ func NewSocks5(option Socks5Option) *Socks5 {
 		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

@@ -5,8 +5,6 @@ import (
 	"encoding/json"
 	"errors"
 	"net"
-	"sort"
-	"sync"
 	"sync/atomic"
 	"time"
 
@@ -35,12 +33,28 @@ func (u *URLTest) Now() string {
 	return u.fast.Name()
 }
 
-func (u *URLTest) Dial(metadata *C.Metadata) (net.Conn, error) {
+func (u *URLTest) DialContext(ctx context.Context, metadata *C.Metadata) (c C.Conn, err error) {
-	a, err := u.fast.Dial(metadata)
+	for i := 0; i < 3; i++ {
-	if err != nil {
+		c, err = u.fast.DialContext(ctx, metadata)
+		if err == nil {
+			c.AppendToChains(u)
+			return
+		}
 		u.fallback()
 	}
-	return a, err
+	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) {
@@ -48,7 +62,6 @@ func (u *URLTest) MarshalJSON() ([]byte, error) {
 	for _, proxy := range u.proxies {
 		all = append(all, proxy.Name())
 	}
-	sort.Strings(all)
 	return json.Marshal(map[string]interface{}{
 		"type": u.Type().String(),
 		"now":  u.Now(),
@@ -97,36 +110,26 @@ func (u *URLTest) speedTest() {
 	}
 	defer atomic.StoreInt32(&u.once, 0)
 
-	wg := sync.WaitGroup{}
+	ctx, cancel := context.WithTimeout(context.Background(), defaultURLTestTimeout)
-	wg.Add(len(u.proxies))
+	defer cancel()
-	c := make(chan interface{})
+	picker := picker.WithoutAutoCancel(ctx)
-	fast := picker.SelectFast(context.Background(), c)
-	timer := time.NewTimer(u.interval)
-
 	for _, p := range u.proxies {
-		go func(p C.Proxy) {
+		proxy := p
-			_, err := p.URLTest(u.rawURL)
+		picker.Go(func() (interface{}, error) {
-			if err == nil {
+			_, err := proxy.URLTest(ctx, u.rawURL)
-				c <- p
+			if err != nil {
+				return nil, err
 			}
-			wg.Done()
+			return proxy, nil
-		}(p)
+		})
 	}
 
-	go func() {
+	fast := picker.WaitWithoutCancel()
-		wg.Wait()
+	if fast != nil {
-		close(c)
+		u.fast = fast.(C.Proxy)
-	}()
+	}
 
-	select {
+	picker.Wait()
-	case <-timer.C:
-		// Wait for fast to return or close.
-		<-fast
-	case p, open := <-fast:
-		if open {
-			u.fast = p.(C.Proxy)
-		}
-	}
 }
 
 func NewURLTest(option URLTestOption, proxies []C.Proxy) (*URLTest, error) {

adapters/outbound/util.go

@@ -1,14 +1,19 @@
 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 (
@@ -41,8 +46,8 @@ func urlToMetadata(rawURL string) (addr C.Metadata, err error) {
 	addr = C.Metadata{
 		AddrType: C.AtypDomainName,
 		Host:     u.Hostname(),
-		IP:       nil,
+		DstIP:    nil,
-		Port:     port,
+		DstPort:  port,
 	}
 	return
 }
@@ -60,3 +65,116 @@ func getClientSessionCache() tls.ClientSessionCache {
 	})
 	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

@@ -1,6 +1,7 @@
 package adapters
 
 import (
+	"context"
 	"fmt"
 	"net"
 	"strconv"
@@ -24,20 +25,36 @@ type VmessOption struct {
 	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) Dial(metadata *C.Metadata) (net.Conn, error) {
+func (v *Vmess) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := net.DialTimeout("tcp", v.server, tcpTimeout)
+	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 c, err
+	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) {
@@ -53,7 +70,7 @@ func NewVmess(option VmessOption) (*Vmess, error) {
 		WebSocketPath:    option.WSPath,
 		WebSocketHeaders: option.WSHeaders,
 		SkipCertVerify:   option.SkipCertVerify,
-		SessionCacahe:    getClientSessionCache(),
+		SessionCache:     getClientSessionCache(),
 	})
 	if err != nil {
 		return nil, err
@@ -63,6 +80,7 @@ func NewVmess(option VmessOption) (*Vmess, error) {
 		Base: &Base{
 			name: option.Name,
 			tp:   C.Vmess,
+			udp:  true,
 		},
 		server: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 		client: client,
@@ -76,11 +94,11 @@ func parseVmessAddr(metadata *C.Metadata) *vmess.DstAddr {
 	case C.AtypIPv4:
 		addrType = byte(vmess.AtypIPv4)
 		addr = make([]byte, net.IPv4len)
-		copy(addr[:], metadata.IP.To4())
+		copy(addr[:], metadata.DstIP.To4())
 	case C.AtypIPv6:
 		addrType = byte(vmess.AtypIPv6)
 		addr = make([]byte, net.IPv6len)
-		copy(addr[:], metadata.IP.To16())
+		copy(addr[:], metadata.DstIP.To16())
 	case C.AtypDomainName:
 		addrType = byte(vmess.AtypDomainName)
 		addr = make([]byte, len(metadata.Host)+1)
@@ -88,10 +106,24 @@ func parseVmessAddr(metadata *C.Metadata) *vmess.DstAddr {
 		copy(addr[1:], []byte(metadata.Host))
 	}
 
-	port, _ := strconv.Atoi(metadata.Port)
+	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
+}

common/cache/cache_test.go

@@ -4,6 +4,8 @@ import (
 	"runtime"
 	"testing"
 	"time"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestCache_Basic(t *testing.T) {
@@ -14,32 +16,30 @@ func TestCache_Basic(t *testing.T) {
 	c.Put("string", "a", ttl)
 
 	i := c.Get("int")
-	if i.(int) != 1 {
+	assert.Equal(t, i.(int), 1, "should recv 1")
-		t.Error("should recv 1")
-	}
 
 	s := c.Get("string")
-	if s.(string) != "a" {
+	assert.Equal(t, s.(string), "a", "should recv 'a'")
-		t.Error("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")
-	if i.(int) != 1 {
+	_, expired := c.GetWithExpire("int2")
-		t.Error("should recv 1")
+	assert.Equal(t, i.(int), 1, "should recv 1")
-	}
+	assert.True(t, now.Before(expired))
 
 	time.Sleep(ttl * 2)
 	i = c.Get("int")
-	if i != nil {
+	j, _ := c.GetWithExpire("int2")
-		t.Error("should recv nil")
+	assert.Nil(t, i, "should recv nil")
-	}
+	assert.Nil(t, j, "should recv nil")
 }
 
 func TestCache_AutoCleanup(t *testing.T) {
@@ -50,9 +50,9 @@ func TestCache_AutoCleanup(t *testing.T) {
 
 	time.Sleep(ttl * 2)
 	i := c.Get("int")
-	if i != nil {
+	j, _ := c.GetWithExpire("int")
-		t.Error("should recv nil")
+	assert.Nil(t, i, "should recv nil")
-	}
+	assert.Nil(t, j, "should recv nil")
 }
 
 func TestCache_AutoGC(t *testing.T) {

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/murmur32.go

@@ -4,6 +4,7 @@ package murmur3
 
 import (
 	"hash"
+	"math/bits"
 	"unsafe"
 )
 
@@ -54,11 +55,11 @@ func (d *digest32) bmix(p []byte) (tail []byte) {
 		k1 := *(*uint32)(unsafe.Pointer(&p[i*4]))
 
 		k1 *= c1_32
-		k1 = (k1 << 15) | (k1 >> 17) // rotl32(k1, 15)
+		k1 = bits.RotateLeft32(k1, 15)
 		k1 *= c2_32
 
 		h1 ^= k1
-		h1 = (h1 << 13) | (h1 >> 19) // rotl32(h1, 13)
+		h1 = bits.RotateLeft32(h1, 13)
 		h1 = h1*4 + h1 + 0xe6546b64
 	}
 	d.h1 = h1
@@ -80,7 +81,7 @@ func (d *digest32) Sum32() (h1 uint32) {
 	case 1:
 		k1 ^= uint32(d.tail[0])
 		k1 *= c1_32
-		k1 = (k1 << 15) | (k1 >> 17) // rotl32(k1, 15)
+		k1 = bits.RotateLeft32(k1, 15)
 		k1 *= c2_32
 		h1 ^= k1
 	}
@@ -102,20 +103,15 @@ func Sum32WithSeed(data []byte, seed uint32) uint32 {
 	h1 := seed
 
 	nblocks := len(data) / 4
-	var p uintptr
+	for i := 0; i < nblocks; i++ {
-	if len(data) > 0 {
+		k1 := *(*uint32)(unsafe.Pointer(&data[i*4]))
-		p = uintptr(unsafe.Pointer(&data[0]))
-	}
-	p1 := p + uintptr(4*nblocks)
-	for ; p < p1; p += 4 {
-		k1 := *(*uint32)(unsafe.Pointer(p))
 
 		k1 *= c1_32
-		k1 = (k1 << 15) | (k1 >> 17) // rotl32(k1, 15)
+		k1 = bits.RotateLeft32(k1, 15)
 		k1 *= c2_32
 
 		h1 ^= k1
-		h1 = (h1 << 13) | (h1 >> 19) // rotl32(h1, 13)
+		h1 = bits.RotateLeft32(h1, 13)
 		h1 = h1*4 + h1 + 0xe6546b64
 	}
 
@@ -132,7 +128,7 @@ func Sum32WithSeed(data []byte, seed uint32) uint32 {
 	case 1:
 		k1 ^= uint32(tail[0])
 		k1 *= c1_32
-		k1 = (k1 << 15) | (k1 >> 17) // rotl32(k1, 15)
+		k1 = bits.RotateLeft32(k1, 15)
 		k1 *= c2_32
 		h1 ^= k1
 	}

common/picker/picker.go

@@ -1,22 +1,89 @@
 package picker
 
-import "context"
+import (
+	"context"
+	"sync"
+	"time"
+)
 
-func SelectFast(ctx context.Context, in <-chan interface{}) <-chan interface{} {
+// Picker provides synchronization, and Context cancelation
-	out := make(chan interface{})
+// for groups of goroutines working on subtasks of a common task.
-	go func() {
+// 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, open := <-in:
+	case <-p.firstDone:
-			if open {
+		return p.result
-				out <- p
+	case <-p.ctx.Done():
+		return p.result
 	}
-		case <-ctx.Done():
 }
 
-		close(out)
+// Go calls the given function in a new goroutine.
-		for range in {
+// 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()
+				}
+			})
 		}
 	}()
-
-	return out
 }

common/picker/picker_test.go

@@ -4,41 +4,63 @@ import (
 	"context"
 	"testing"
 	"time"
+
+	"github.com/stretchr/testify/assert"
 )
 
-func sleepAndSend(delay int, in chan<- interface{}, input interface{}) {
+func sleepAndSend(ctx context.Context, delay int, input interface{}) func() (interface{}, error) {
-	time.Sleep(time.Millisecond * time.Duration(delay))
+	return func() (interface{}, error) {
-	in <- input
+		timer := time.NewTimer(time.Millisecond * time.Duration(delay))
+		select {
+		case <-timer.C:
+			return input, nil
+		case <-ctx.Done():
+			return nil, ctx.Err()
+		}
 	}
-
-func sleepAndClose(delay int, in chan interface{}) {
-	time.Sleep(time.Millisecond * time.Duration(delay))
-	close(in)
 }
 
 func TestPicker_Basic(t *testing.T) {
-	in := make(chan interface{})
+	picker, ctx := WithContext(context.Background())
-	fast := SelectFast(context.Background(), in)
+	picker.Go(sleepAndSend(ctx, 30, 2))
-	go sleepAndSend(20, in, 1)
+	picker.Go(sleepAndSend(ctx, 20, 1))
-	go sleepAndSend(30, in, 2)
-	go sleepAndClose(40, in)
 
-	number, exist := <-fast
+	number := picker.Wait()
-	if !exist || number != 1 {
+	assert.NotNil(t, number)
-		t.Error("should recv 1", exist, number)
+	assert.Equal(t, number.(int), 1)
-	}
 }
 
 func TestPicker_Timeout(t *testing.T) {
-	in := make(chan interface{})
+	picker, ctx := WithTimeout(context.Background(), time.Millisecond*5)
-	ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond*5)
+	picker.Go(sleepAndSend(ctx, 20, 1))
-	defer cancel()
-	fast := SelectFast(ctx, in)
-	go sleepAndSend(20, in, 1)
-	go sleepAndClose(30, in)
 
-	_, exist := <-fast
+	number := picker.Wait()
-	if exist {
+	assert.Nil(t, number)
-		t.Error("should recv false")
 }
+
+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

@@ -34,16 +34,16 @@ func (q *Queue) Pop() interface{} {
 	return head
 }
 
-// First returns the head of items without deleting.
+// Last returns the last of item.
-func (q *Queue) First() interface{} {
+func (q *Queue) Last() interface{} {
 	if len(q.items) == 0 {
 		return nil
 	}
 
 	q.lock.RLock()
-	head := q.items[0]
+	last := q.items[len(q.items)-1]
 	q.lock.RUnlock()
-	return head
+	return last
 }
 
 // Copy get the copy of queue.

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

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

component/simple-obfs/tls.go

@@ -6,8 +6,9 @@ import (
 	"io"
 	"math/rand"
 	"net"
-	"sync"
 	"time"
+
+	"github.com/Dreamacro/clash/common/pool"
 )
 
 func init() {
@@ -18,8 +19,6 @@ const (
 	chunkSize = 1 << 14 // 2 ** 14 == 16 * 1024
 )
 
-var bufPool = sync.Pool{New: func() interface{} { return make([]byte, 2048) }}
-
 // TLSObfs is shadowsocks tls simple-obfs implementation
 type TLSObfs struct {
 	net.Conn
@@ -30,12 +29,12 @@ type TLSObfs struct {
 }
 
 func (to *TLSObfs) read(b []byte, discardN int) (int, error) {
-	buf := bufPool.Get().([]byte)
+	buf := pool.BufPool.Get().([]byte)
 	_, err := io.ReadFull(to.Conn, buf[:discardN])
 	if err != nil {
 		return 0, err
 	}
-	bufPool.Put(buf[:cap(buf)])
+	pool.BufPool.Put(buf[:cap(buf)])
 
 	sizeBuf := make([]byte, 2)
 	_, err = io.ReadFull(to.Conn, sizeBuf)
@@ -103,7 +102,7 @@ func (to *TLSObfs) write(b []byte) (int, error) {
 		return len(b), err
 	}
 
-	size := bufPool.Get().([]byte)
+	size := pool.BufPool.Get().([]byte)
 	binary.BigEndian.PutUint16(size[:2], uint16(len(b)))
 
 	buf := &bytes.Buffer{}
@@ -111,7 +110,7 @@ func (to *TLSObfs) write(b []byte) (int, error) {
 	buf.Write(size[:2])
 	buf.Write(b)
 	_, err := to.Conn.Write(buf.Bytes())
-	bufPool.Put(size[:cap(size)])
+	pool.BufPool.Put(size[:cap(size)])
 	return len(b), err
 }
 

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/websocket.go

@@ -3,25 +3,32 @@ package obfs
 import (
 	"crypto/tls"
 	"net"
+	"net/http"
 
 	"github.com/Dreamacro/clash/component/vmess"
 )
 
-// WebsocketOption is options of websocket obfs
+// Option is options of websocket obfs
-type WebsocketOption struct {
+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)
 	}
 
-// NewWebsocketObfs return a HTTPObfs
-func NewWebsocketObfs(conn net.Conn, option *WebsocketOption) (net.Conn, error) {
 	config := &vmess.WebsocketConfig{
 		Host:      option.Host,
 		Path:      option.Path,
 		TLS:       option.TLSConfig != nil,
-		Headers:   option.Headers,
+		Headers:   header,
 		TLSConfig: option.TLSConfig,
 	}
 
@@ -30,10 +37,13 @@ func NewWebsocketObfs(conn net.Conn, option *WebsocketOption) (net.Conn, error)
 	if err != nil {
 		return nil, err
 	}
+
+	if option.Mux {
 		conn = NewMux(conn, MuxOption{
 			ID:   [2]byte{0, 0},
 			Host: "127.0.0.1",
 			Port: 0,
 		})
+	}
 	return conn, nil
 }

component/vmess/aead.go

@@ -5,6 +5,8 @@ import (
 	"encoding/binary"
 	"errors"
 	"io"
+
+	"github.com/Dreamacro/clash/common/pool"
 )
 
 type aeadWriter struct {
@@ -20,8 +22,8 @@ func newAEADWriter(w io.Writer, aead cipher.AEAD, iv []byte) *aeadWriter {
 }
 
 func (w *aeadWriter) Write(b []byte) (n int, err error) {
-	buf := bufPool.Get().([]byte)
+	buf := pool.BufPool.Get().([]byte)
-	defer bufPool.Put(buf[:cap(buf)])
+	defer pool.BufPool.Put(buf[:cap(buf)])
 	length := len(b)
 	for {
 		if length == 0 {
@@ -71,7 +73,7 @@ func (r *aeadReader) Read(b []byte) (int, error) {
 		n := copy(b, r.buf[r.offset:])
 		r.offset += n
 		if r.offset == len(r.buf) {
-			bufPool.Put(r.buf[:cap(r.buf)])
+			pool.BufPool.Put(r.buf[:cap(r.buf)])
 			r.buf = nil
 		}
 		return n, nil
@@ -87,10 +89,10 @@ func (r *aeadReader) Read(b []byte) (int, error) {
 		return 0, errors.New("Buffer is larger than standard")
 	}
 
-	buf := bufPool.Get().([]byte)
+	buf := pool.BufPool.Get().([]byte)
 	_, err = io.ReadFull(r.Reader, buf[:size])
 	if err != nil {
-		bufPool.Put(buf[:cap(buf)])
+		pool.BufPool.Put(buf[:cap(buf)])
 		return 0, err
 	}
 
@@ -105,7 +107,7 @@ func (r *aeadReader) Read(b []byte) (int, error) {
 	realLen := size - r.Overhead()
 	n := copy(b, buf[:realLen])
 	if len(b) >= realLen {
-		bufPool.Put(buf[:cap(buf)])
+		pool.BufPool.Put(buf[:cap(buf)])
 		return n, nil
 	}
 

component/vmess/chunk.go

@@ -4,7 +4,8 @@ import (
 	"encoding/binary"
 	"errors"
 	"io"
-	"sync"
+
+	"github.com/Dreamacro/clash/common/pool"
 )
 
 const (
@@ -13,8 +14,6 @@ const (
 	maxSize   = 17 * 1024 // 2 + chunkSize + aead.Overhead()
 )
 
-var bufPool = sync.Pool{New: func() interface{} { return make([]byte, maxSize) }}
-
 type chunkReader struct {
 	io.Reader
 	buf     []byte
@@ -35,7 +34,7 @@ func (cr *chunkReader) Read(b []byte) (int, error) {
 		n := copy(b, cr.buf[cr.offset:])
 		cr.offset += n
 		if cr.offset == len(cr.buf) {
-			bufPool.Put(cr.buf[:cap(cr.buf)])
+			pool.BufPool.Put(cr.buf[:cap(cr.buf)])
 			cr.buf = nil
 		}
 		return n, nil
@@ -60,10 +59,10 @@ func (cr *chunkReader) Read(b []byte) (int, error) {
 		return size, nil
 	}
 
-	buf := bufPool.Get().([]byte)
+	buf := pool.BufPool.Get().([]byte)
 	_, err = io.ReadFull(cr.Reader, buf[:size])
 	if err != nil {
-		bufPool.Put(buf[:cap(buf)])
+		pool.BufPool.Put(buf[:cap(buf)])
 		return 0, err
 	}
 	n := copy(b, cr.buf[:])
@@ -77,8 +76,8 @@ type chunkWriter struct {
 }
 
 func (cw *chunkWriter) Write(b []byte) (n int, err error) {
-	buf := bufPool.Get().([]byte)
+	buf := pool.BufPool.Get().([]byte)
-	defer bufPool.Put(buf[:cap(buf)])
+	defer pool.BufPool.Put(buf[:cap(buf)])
 	length := len(b)
 	for {
 		if length == 0 {

component/vmess/conn.go

@@ -77,7 +77,11 @@ func (vc *Conn) sendRequest() error {
 	// 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))

component/vmess/vmess.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	"math/rand"
 	"net"
+	"net/http"
 	"runtime"
 	"sync"
 
@@ -57,6 +58,7 @@ const (
 
 // DstAddr store destination address
 type DstAddr struct {
+	UDP      bool
 	AddrType byte
 	Addr     []byte
 	Port     uint
@@ -85,7 +87,7 @@ type Config struct {
 	WebSocketPath    string
 	WebSocketHeaders map[string]string
 	SkipCertVerify   bool
-	SessionCacahe    tls.ClientSessionCache
+	SessionCache     tls.ClientSessionCache
 }
 
 // New return a Conn with net.Conn and DstAddr
@@ -131,6 +133,11 @@ func NewClient(config Config) (*Client, error) {
 		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
@@ -138,11 +145,14 @@ func NewClient(config Config) (*Client, error) {
 		tlsConfig = &tls.Config{
 			ServerName:         config.HostName,
 			InsecureSkipVerify: config.SkipCertVerify,
-			ClientSessionCache: config.SessionCacahe,
+			ClientSessionCache: config.SessionCache,
 		}
 		if tlsConfig.ClientSessionCache == nil {
 			tlsConfig.ClientSessionCache = getClientSessionCache()
 		}
+		if host := header.Get("Host"); host != "" {
+			tlsConfig.ServerName = host
+		}
 	}
 
 	var wsConfig *WebsocketConfig
@@ -150,7 +160,7 @@ func NewClient(config Config) (*Client, error) {
 		wsConfig = &WebsocketConfig{
 			Host:      host,
 			Path:      config.WebSocketPath,
-			Headers:   config.WebSocketHeaders,
+			Headers:   header,
 			TLS:       config.TLS,
 			TLSConfig: tlsConfig,
 		}

component/vmess/websocket.go

@@ -22,7 +22,7 @@ type websocketConn struct {
 type WebsocketConfig struct {
 	Host      string
 	Path      string
-	Headers   map[string]string
+	Headers   http.Header
 	TLS       bool
 	TLSConfig *tls.Config
 }
@@ -131,14 +131,14 @@ func NewWebsocketConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
 
 	headers := http.Header{}
 	if c.Headers != nil {
-		for k, v := range c.Headers {
+		for k := range c.Headers {
-			headers.Set(k, v)
+			headers.Add(k, c.Headers.Get(k))
 		}
 	}
 
 	wsConn, resp, err := dialer.Dial(uri.String(), headers)
 	if err != nil {
-		var reason string
+		reason := err.Error()
 		if resp != nil {
 			reason = resp.Status
 		}

config/config.go

@@ -11,6 +11,9 @@ import (
 
 	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"
@@ -25,7 +28,9 @@ 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:"-"`
@@ -39,15 +44,31 @@ type DNS struct {
 	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
 }
 
@@ -56,50 +77,91 @@ type rawDNS struct {
 	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 := ioutil.ReadFile(path)
+	data, err := readRawConfig(path)
 	if err != nil {
 		return nil, err
 	}
 
 	if len(data) == 0 {
-		return nil, fmt.Errorf("Configuration file %s is empty", C.Path.Config())
+		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)
@@ -114,6 +176,7 @@ func Parse(path string) (*Config, error) {
 	if err != nil {
 		return nil, err
 	}
+	config.Experimental = &rawCfg.Experimental
 
 	general, err := parseGeneral(rawCfg)
 	if err != nil {
@@ -127,7 +190,7 @@ func Parse(path string) (*Config, error) {
 	}
 	config.Proxies = proxies
 
-	rules, err := parseRules(rawCfg)
+	rules, err := parseRules(rawCfg, proxies)
 	if err != nil {
 		return nil, err
 	}
@@ -139,6 +202,14 @@ func Parse(path string) (*Config, error) {
 	}
 	config.DNS = dnsCfg
 
+	hosts, err := parseHosts(rawCfg)
+	if err != nil {
+		return nil, err
+	}
+	config.Hosts = hosts
+
+	config.Users = parseAuthentication(rawCfg.Authentication)
+
 	return config, nil
 }
 
@@ -147,6 +218,7 @@ func parseGeneral(cfg *rawConfig) (*General, error) {
 	socksPort := cfg.SocksPort
 	redirPort := cfg.RedirPort
 	allowLan := cfg.AllowLan
+	bindAddress := cfg.BindAddress
 	externalController := cfg.ExternalController
 	externalUI := cfg.ExternalUI
 	secret := cfg.Secret
@@ -168,6 +240,7 @@ func parseGeneral(cfg *rawConfig) (*General, error) {
 		SocksPort:          socksPort,
 		RedirPort:          redirPort,
 		AllowLan:           allowLan,
+		BindAddress:        bindAddress,
 		Mode:               mode,
 		LogLevel:           logLevel,
 		ExternalController: externalController,
@@ -179,6 +252,7 @@ func parseGeneral(cfg *rawConfig) (*General, error) {
 
 func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 	proxies := make(map[string]C.Proxy)
+	proxyList := []string{}
 	proxiesConfig := cfg.Proxy
 	groupsConfig := cfg.ProxyGroup
 
@@ -186,6 +260,7 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 
 	proxies["DIRECT"] = adapters.NewProxy(adapters.NewDirect())
 	proxies["REJECT"] = adapters.NewProxy(adapters.NewReject())
+	proxyList = append(proxyList, "DIRECT", "REJECT")
 
 	// parse proxy
 	for idx, mapping := range proxiesConfig {
@@ -195,7 +270,7 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 		}
 
 		var proxy C.ProxyAdapter
-		err := fmt.Errorf("can't parse")
+		err := fmt.Errorf("cannot parse")
 		switch proxyType {
 		case "ss":
 			ssOption := &adapters.ShadowSocksOption{}
@@ -225,6 +300,13 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 				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)
 		}
@@ -237,14 +319,29 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 			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 idx, mapping := range groupsConfig {
+	for _, mapping := range groupsConfig {
 		groupType, existType := mapping["type"].(string)
-		groupName, existName := mapping["name"].(string)
+		groupName, _ := mapping["name"].(string)
-		if !existType && existName {
+		if !existType {
-			return nil, fmt.Errorf("ProxyGroup %d: missing type or name", idx)
+			return nil, fmt.Errorf("ProxyGroup %s: missing type", groupName)
 		}
 
 		if _, exist := proxies[groupName]; exist {
@@ -253,7 +350,7 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 		var group C.ProxyAdapter
 		ps := []C.Proxy{}
 
-		err := fmt.Errorf("can't parse")
+		err := fmt.Errorf("cannot parse")
 		switch groupType {
 		case "url-test":
 			urlTestOption := &adapters.URLTestOption{}
@@ -311,8 +408,8 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 	}
 
 	ps := []C.Proxy{}
-	for _, v := range proxies {
+	for _, v := range proxyList {
-		ps = append(ps, v)
+		ps = append(ps, proxies[v])
 	}
 
 	global, _ := adapters.NewSelector("GLOBAL", ps)
@@ -320,7 +417,7 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 	return proxies, nil
 }
 
-func parseRules(cfg *rawConfig) ([]C.Rule, error) {
+func parseRules(cfg *rawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
 	rules := []C.Rule{}
 
 	rulesConfig := cfg.Rule
@@ -342,6 +439,10 @@ func parseRules(cfg *rawConfig) ([]C.Rule, error) {
 			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] {
@@ -357,12 +458,24 @@ func parseRules(cfg *rawConfig) ([]C.Rule, error) {
 			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)
 		}
@@ -377,6 +490,21 @@ func parseRules(cfg *rawConfig) ([]C.Rule, error) {
 	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 += ":"
@@ -418,9 +546,14 @@ func parseNameServer(servers []string) ([]dns.NameServer, error) {
 		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())
 		}
@@ -436,6 +569,20 @@ func parseNameServer(servers []string) ([]dns.NameServer, error) {
 	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")
@@ -444,7 +591,11 @@ func parseDNS(cfg rawDNS) (*DNS, error) {
 	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 {
@@ -455,5 +606,34 @@ func parseDNS(cfg rawDNS) (*DNS, error) {
 		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

@@ -63,9 +63,9 @@ func Init(dir string) error {
 		}
 	}
 
-	// initial config.yml
+	// initial config.yaml
 	if _, err := os.Stat(C.Path.Config()); os.IsNotExist(err) {
-		log.Info("Can't find config, create a empty file")
+		log.Info("Can't find config, create an empty file")
 		os.OpenFile(C.Path.Config(), os.O_CREATE|os.O_WRONLY, 0644)
 	}
 

config/utils.go

@@ -4,6 +4,8 @@ import (
 	"fmt"
 	"strings"
 
+	adapters "github.com/Dreamacro/clash/adapters/outbound"
+	"github.com/Dreamacro/clash/common/structure"
 	C "github.com/Dreamacro/clash/constant"
 )
 
@@ -34,3 +36,124 @@ func or(pointers ...*int) *int {
 	}
 	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

@@ -1,6 +1,8 @@
 package constant
 
 import (
+	"context"
+	"fmt"
 	"net"
 	"time"
 )
@@ -12,6 +14,7 @@ const (
 	Reject
 	Selector
 	Shadowsocks
+	Snell
 	Socks5
 	Http
 	URLTest
@@ -20,14 +23,44 @@ const (
 )
 
 type ServerAdapter interface {
+	net.Conn
 	Metadata() *Metadata
-	Close()
+}
+
+type Connection interface {
+	Chains() Chain
+	AppendToChains(adapter ProxyAdapter)
+}
+
+type Chain []string
+
+func (c Chain) String() string {
+	switch len(c) {
+	case 0:
+		return ""
+	case 1:
+		return c[0]
+	default:
+		return fmt.Sprintf("%s[%s]", c[len(c)-1], c[0])
+	}
+}
+
+type Conn interface {
+	net.Conn
+	Connection
+}
+
+type PacketConn interface {
+	net.PacketConn
+	Connection
 }
 
 type ProxyAdapter interface {
 	Name() string
 	Type() AdapterType
-	Dial(metadata *Metadata) (net.Conn, error)
+	DialContext(ctx context.Context, metadata *Metadata) (Conn, error)
+	DialUDP(metadata *Metadata) (PacketConn, net.Addr, error)
+	SupportUDP() bool
 	Destroy()
 	MarshalJSON() ([]byte, error)
 }
@@ -41,8 +74,9 @@ type Proxy interface {
 	ProxyAdapter
 	Alive() bool
 	DelayHistory() []DelayHistory
+	Dial(metadata *Metadata) (Conn, error)
 	LastDelay() uint16
-	URLTest(url string) (uint16, error)
+	URLTest(ctx context.Context, url string) (uint16, error)
 }
 
 // AdapterType is enum of adapter type
@@ -60,6 +94,8 @@ func (at AdapterType) String() string {
 		return "Selector"
 	case Shadowsocks:
 		return "Shadowsocks"
+	case Snell:
+		return "Snell"
 	case Socks5:
 		return "Socks5"
 	case Http:
@@ -71,6 +107,6 @@ func (at AdapterType) String() string {
 	case LoadBalance:
 		return "LoadBalance"
 	default:
-		return "Unknow"
+		return "Unknown"
 	}
 }

constant/metadata.go

@@ -13,7 +13,7 @@ const (
 	TCP NetWork = iota
 	UDP
 
-	HTTP SourceType = iota
+	HTTP Type = iota
 	SOCKS
 	REDIR
 )
@@ -27,26 +27,34 @@ func (n *NetWork) String() string {
 	return "udp"
 }
 
-type SourceType int
+type Type int
 
 // Metadata is used to store connection address
 type Metadata struct {
 	NetWork  NetWork
-	Source   SourceType
+	Type     Type
-	SourceIP *net.IP
+	SrcIP    *net.IP
+	DstIP    *net.IP
+	SrcPort  string
+	DstPort  string
 	AddrType int
 	Host     string
-	IP       *net.IP
+}
-	Port     string
+
+func (m *Metadata) RemoteAddress() string {
+	return net.JoinHostPort(m.String(), m.DstPort)
 }
 
 func (m *Metadata) String() string {
-	if m.Host == "" {
+	if m.Host != "" {
-		return m.IP.String()
-	}
 		return m.Host
+	} else if m.DstIP != nil {
+		return m.DstIP.String()
+	} else {
+		return "<nil>"
+	}
 }
 
 func (m *Metadata) Valid() bool {
-	return m.Host != "" || m.IP != nil
+	return m.Host != "" || m.DstIP != nil
 }

constant/path.go

@@ -2,7 +2,6 @@ package constant
 
 import (
 	"os"
-	"os/user"
 	P "path"
 )
 
@@ -16,16 +15,9 @@ type path struct {
 }
 
 func init() {
-	currentUser, err := user.Current()
+	homedir, err := os.UserHomeDir()
-	var homedir string
 	if err != nil {
-		dir := os.Getenv("HOME")
+		homedir, _ = os.Getwd()
-		if dir == "" {
-			dir, _ = os.Getwd()
-		}
-		homedir = dir
-	} else {
-		homedir = currentUser.HomeDir
 	}
 
 	homedir = P.Join(homedir, ".config", Name)
@@ -42,7 +34,7 @@ func (p *path) HomeDir() string {
 }
 
 func (p *path) Config() string {
-	return P.Join(p.homedir, "config.yml")
+	return P.Join(p.homedir, "config.yaml")
 }
 
 func (p *path) MMDB() string {

constant/rule.go

@@ -7,7 +7,9 @@ const (
 	DomainKeyword
 	GEOIP
 	IPCIDR
-	SourceIPCIDR
+	SrcIPCIDR
+	SrcPort
+	DstPort
 	MATCH
 )
 
@@ -25,12 +27,16 @@ func (rt RuleType) String() string {
 		return "GEOIP"
 	case IPCIDR:
 		return "IPCIDR"
-	case SourceIPCIDR:
+	case SrcIPCIDR:
-		return "SourceIPCIDR"
+		return "SrcIPCIDR"
+	case SrcPort:
+		return "SrcPort"
+	case DstPort:
+		return "DstPort"
 	case MATCH:
 		return "MATCH"
 	default:
-		return "Unknow"
+		return "Unknown"
 	}
 }
 

dns/client.go

@@ -2,259 +2,20 @@ package dns
 
 import (
 	"context"
-	"crypto/tls"
-	"errors"
-	"net"
-	"strings"
-	"sync"
-	"time"
-
-	"github.com/Dreamacro/clash/common/cache"
-	"github.com/Dreamacro/clash/common/picker"
-	C "github.com/Dreamacro/clash/constant"
 
 	D "github.com/miekg/dns"
-	geoip2 "github.com/oschwald/geoip2-golang"
 )
 
-var (
+type client struct {
-	globalSessionCache = tls.NewLRUClientSessionCache(64)
+	*D.Client
-
-	mmdb     *geoip2.Reader
-	once     sync.Once
-	resolver *Resolver
-)
-
-type Resolver struct {
-	ipv6     bool
-	mapping  bool
-	fallback []*nameserver
-	main     []*nameserver
-	cache    *cache.Cache
-}
-
-type result struct {
-	Msg   *D.Msg
-	Error error
-}
-
-func isIPRequest(q D.Question) bool {
-	if q.Qclass == D.ClassINET && (q.Qtype == D.TypeA || q.Qtype == D.TypeAAAA) {
-		return true
-	}
-	return false
-}
-
-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)
-			}
-		}
-	}()
-
-	isIPReq := isIPRequest(q)
-	if isIPReq {
-		msg, err = r.resolveIP(m)
-		return
-	}
-
-	msg, err = r.exchange(r.main, m)
-	return
-}
-
-func (r *Resolver) exchange(servers []*nameserver, m *D.Msg) (msg *D.Msg, err error) {
-	in := make(chan interface{})
-	ctx, cancel := context.WithTimeout(context.Background(), time.Second)
-	defer cancel()
-	fast := picker.SelectFast(ctx, in)
-
-	wg := sync.WaitGroup{}
-	wg.Add(len(servers))
-	for _, server := range servers {
-		go func(s *nameserver) {
-			defer wg.Done()
-			msg, _, err := s.Client.Exchange(m, s.Address)
-			if err != nil || msg.Rcode != D.RcodeSuccess {
-				return
-			}
-			in <- &result{Msg: msg, Error: err}
-		}(server)
-	}
-
-	// release in channel
-	go func() {
-		wg.Wait()
-		close(in)
-	}()
-
-	elm, exist := <-fast
-	if !exist {
-		return nil, errors.New("All DNS requests failed")
-	}
-
-	resp := elm.(*result)
-	msg, err = resp.Msg, resp.Error
-	return
-}
-
-func (r *Resolver) resolveIP(m *D.Msg) (msg *D.Msg, err error) {
-	msgCh := r.resolve(r.main, m)
-	if r.fallback == nil {
-		res := <-msgCh
-		msg, err = res.Msg, res.Error
-		return
-	}
-	fallbackMsg := r.resolve(r.fallback, m)
-	res := <-msgCh
-	if res.Error == nil {
-		if mmdb == nil {
-			return nil, errors.New("GeoIP can't use")
-		}
-
-		if ips := r.msgToIP(res.Msg); len(ips) != 0 {
-			if record, _ := mmdb.Country(ips[0]); record.Country.IsoCode == "CN" || record.Country.IsoCode == "" {
-				// release channel
-				go func() { <-fallbackMsg }()
-				msg = res.Msg
-				return msg, err
-			}
-		}
-	}
-
-	res = <-fallbackMsg
-	msg, err = res.Msg, res.Error
-	return
-}
-
-func (r *Resolver) ResolveIP(host string) (ip net.IP, err error) {
-	ip = net.ParseIP(host)
-	if ip != nil {
-		return ip, nil
-	}
-
-	query := &D.Msg{}
-	dnsType := D.TypeA
-	if r.ipv6 {
-		dnsType = D.TypeAAAA
-	}
-	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, errors.New("can't found ip")
-	}
-
-	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) IPToHost(ip net.IP) (string, bool) {
-	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) resolve(client []*nameserver, msg *D.Msg) <-chan *result {
-	ch := make(chan *result)
-	go func() {
-		res, err := r.exchange(client, msg)
-		ch <- &result{Msg: res, Error: err}
-	}()
-	return ch
-}
-
-func (r *Resolver) IsMapping() bool {
-	return r.mapping
-}
-
-type NameServer struct {
-	Net  string
-	Addr string
-}
-
-type nameserver struct {
-	Client  *D.Client
 	Address string
 }
 
-type Config struct {
+func (c *client) Exchange(m *D.Msg) (msg *D.Msg, err error) {
-	Main, Fallback []NameServer
+	return c.ExchangeContext(context.Background(), m)
-	IPv6           bool
-	EnhancedMode   EnhancedMode
 }
 
-func transform(servers []NameServer) []*nameserver {
+func (c *client) ExchangeContext(ctx context.Context, m *D.Msg) (msg *D.Msg, err error) {
-	var ret []*nameserver
+	msg, _, err = c.Client.ExchangeContext(ctx, m, c.Address)
-	for _, s := range servers {
+	return
-		ret = append(ret, &nameserver{
-			Client: &D.Client{
-				Net: s.Net,
-				TLSConfig: &tls.Config{
-					ClientSessionCache: globalSessionCache,
-				},
-				UDPSize: 4096,
-			},
-			Address: s.Addr,
-		})
-	}
-	return ret
-}
-
-func New(config Config) *Resolver {
-	once.Do(func() {
-		mmdb, _ = geoip2.Open(C.Path.MMDB())
-	})
-
-	r := &Resolver{
-		main:    transform(config.Main),
-		ipv6:    config.IPv6,
-		cache:   cache.New(time.Second * 60),
-		mapping: config.EnhancedMode == MAPPING,
-	}
-	if config.Fallback != nil {
-		r.fallback = transform(config.Fallback)
-	}
-	return r
 }

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

@@ -1,51 +1,46 @@
 package dns
 
 import (
-	"fmt"
 	"net"
 
-	"github.com/Dreamacro/clash/log"
 	D "github.com/miekg/dns"
 )
 
 var (
 	address string
 	server  = &Server{}
+
+	dnsDefaultTTL uint32 = 600
 )
 
 type Server struct {
 	*D.Server
-	r *Resolver
+	handler handler
 }
 
 func (s *Server) ServeDNS(w D.ResponseWriter, r *D.Msg) {
-	msg, err := s.r.Exchange(r)
+	if len(r.Question) == 0 {
-
-	if err != nil {
-		if len(r.Question) > 0 {
-			q := r.Question[0]
-			qString := fmt.Sprintf("%s %s %s", q.Name, D.Class(q.Qclass).String(), D.Type(q.Qtype).String())
-			log.Debugln("[DNS Server] Exchange %s failed: %v", qString, err)
-		}
 		D.HandleFailed(w, r)
 		return
 	}
-	msg.SetReply(r)
+
-	w.WriteMsg(msg)
+	s.handler(w, r)
 }
 
-func (s *Server) setReslover(r *Resolver) {
+func (s *Server) setHandler(handler handler) {
-	s.r = r
+	s.handler = handler
 }
 
 func ReCreateServer(addr string, resolver *Resolver) error {
-	if addr == address {
+	if addr == address && resolver != nil {
-		server.setReslover(resolver)
+		handler := newHandler(resolver)
+		server.setHandler(handler)
 		return nil
 	}
 
 	if server.Server != nil {
 		server.Shutdown()
+		address = ""
 	}
 
 	_, port, err := net.SplitHostPort(addr)
@@ -64,7 +59,8 @@ func ReCreateServer(addr string, resolver *Resolver) error {
 	}
 
 	address = addr
-	server = &Server{r: resolver}
+	handler := newHandler(resolver)
+	server = &Server{handler: handler}
 	server.Server = &D.Server{Addr: addr, PacketConn: p, Handler: server}
 
 	go func() {

dns/util.go

@@ -1,6 +1,7 @@
 package dns
 
 import (
+	"crypto/tls"
 	"encoding/json"
 	"errors"
 	"time"
@@ -70,7 +71,7 @@ func (e EnhancedMode) String() string {
 	case NORMAL:
 		return "normal"
 	case FAKEIP:
-		return "fakeip"
+		return "fake-ip"
 	case MAPPING:
 		return "redir-host"
 	default:
@@ -107,3 +108,34 @@ func setMsgTTL(msg *D.Msg, ttl uint32) {
 		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

@@ -1,20 +1,23 @@
 module github.com/Dreamacro/clash
 
+go 1.13
+
 require (
-	github.com/Dreamacro/go-shadowsocks2 v0.1.3-0.20190202135136-da4602d8f112
+	github.com/Dreamacro/go-shadowsocks2 v0.1.5-0.20191012162057-46254afc8b68
 	github.com/eapache/queue v1.1.0 // indirect
-	github.com/go-chi/chi v4.0.1+incompatible
+	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 v1.4.0
+	github.com/gorilla/websocket v1.4.1
-	github.com/miekg/dns v1.1.4
+	github.com/miekg/dns v1.1.22
-	github.com/oschwald/geoip2-golang v1.2.1
+	github.com/oschwald/geoip2-golang v1.3.0
-	github.com/oschwald/maxminddb-golang v1.3.0 // indirect
+	github.com/oschwald/maxminddb-golang v1.5.0 // indirect
-	github.com/sirupsen/logrus v1.3.0
+	github.com/sirupsen/logrus v1.4.2
-	golang.org/x/crypto v0.0.0-20190131182504-b8fe1690c613
+	github.com/stretchr/testify v1.4.0
-	golang.org/x/net v0.0.0-20181108082009-03003ca0c849
+	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
-	golang.org/x/sync v0.0.0-20181108010431-42b317875d0f // indirect
+	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

@@ -1,46 +1,70 @@
-github.com/Dreamacro/go-shadowsocks2 v0.1.3-0.20190202135136-da4602d8f112 h1:1axYxE0ZLJy40+ulq46XQt7MaJDJr4iGer1NQz7jmKw=
+github.com/Dreamacro/go-shadowsocks2 v0.1.5-0.20191012162057-46254afc8b68 h1:UBDLpj1IGVkUcUBuZWE6DmZApPTZcnmcV6AfyDN/yhg=
-github.com/Dreamacro/go-shadowsocks2 v0.1.3-0.20190202135136-da4602d8f112/go.mod h1:giIuN+TuUudTxHc1jjTOyyQYiJ3VXp1pWOHdJbSCAPo=
+github.com/Dreamacro/go-shadowsocks2 v0.1.5-0.20191012162057-46254afc8b68/go.mod h1:Y8obOtHDOqxMGHjPglfCiXZBKExOA9VL6I6sJagOwYM=
 github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da h1:KjTM2ks9d14ZYCvmHS9iAKVt9AyzRSqNU1qabPih5BY=
 github.com/aead/chacha20 v0.0.0-20180709150244-8b13a72661da/go.mod h1:eHEWzANqSiWQsof+nXEI9bUVUyV6F53Fp89EuCh2EAA=
+github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/eapache/queue v1.1.0 h1:YOEu7KNc61ntiQlcEeUIoDTJ2o8mQznoNvUhiigpIqc=
 github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
-github.com/go-chi/chi v4.0.1+incompatible h1:RSRC5qmFPtO90t7pTL0DBMNpZFsb/sHF3RXVlDgFisA=
+github.com/go-chi/chi v4.0.2+incompatible h1:maB6vn6FqCxrpz4FqWdh4+lwpyZIQS7YEAUcHlgXVRs=
-github.com/go-chi/chi v4.0.1+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
+github.com/go-chi/chi v4.0.2+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
 github.com/go-chi/cors v1.0.0 h1:e6x8k7uWbUwYs+aXDoiUzeQFT6l0cygBYyNhD7/1Tg0=
 github.com/go-chi/cors v1.0.0/go.mod h1:K2Yje0VW/SJzxiyMYu6iPQYa7hMjQX2i/F491VChg1I=
 github.com/go-chi/render v1.0.1 h1:4/5tis2cKaNdnv9zFLfXzcquC9HbeZgCnxGnKrltBS8=
 github.com/go-chi/render v1.0.1/go.mod h1:pq4Rr7HbnsdaeHagklXub+p6Wd16Af5l9koip1OvJns=
 github.com/gofrs/uuid v3.2.0+incompatible h1:y12jRkkFxsd7GpqdSZ+/KCs/fJbqpEXSGd4+jfEaewE=
 github.com/gofrs/uuid v3.2.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
-github.com/gorilla/websocket v1.4.0 h1:WDFjx/TMzVgy9VdMMQi2K2Emtwi2QcUQsztZ/zLaH/Q=
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 github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
 github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
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 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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 github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
-golang.org/x/crypto v0.0.0-20180904163835-0709b304e793/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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-golang.org/x/crypto v0.0.0-20190131182504-b8fe1690c613/go.mod h1:6SG95UA2DQfeDnfUPMdvaQW0Q7yPrPDi9nlGo2tz2b4=
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hub/executor/executor.go

@@ -1,11 +1,14 @@
 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"
 )
 
@@ -21,29 +24,45 @@ func ParseWithPath(path string) (*config.Config, error) {
 
 // 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()
-	return &config.General{
+	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 {
-		T.Instance().SetResolver(nil)
+		dns.DefaultResolver = nil
 		dns.ReCreateServer("", nil)
 		return
 	}
@@ -52,14 +71,26 @@ func updateDNS(c *config.DNS) {
 		Fallback:     c.Fallback,
 		IPv6:         c.IPv6,
 		EnhancedMode: c.EnhancedMode,
+		Pool:         c.FakeIPRange,
+		FallbackFilter: dns.FallbackFilter{
+			GeoIP:  c.FallbackFilter.GeoIP,
+			IPCIDR: c.FallbackFilter.IPCIDR,
+		},
 	})
-	T.Instance().SetResolver(r)
+	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()
@@ -82,8 +113,11 @@ func updateGeneral(general *config.General) {
 	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())
 	}
@@ -96,3 +130,11 @@ func updateGeneral(general *config.General) {
 		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/route/configs.go

@@ -26,6 +26,7 @@ type configSchema struct {
 	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"`
 }
@@ -55,6 +56,10 @@ func patchConfigs(w http.ResponseWriter, r *http.Request) {
 		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))

hub/route/proxies.go

@@ -110,27 +110,23 @@ func getProxyDelay(w http.ResponseWriter, r *http.Request) {
 
 	proxy := r.Context().Value(CtxKeyProxy).(C.Proxy)
 
-	sigCh := make(chan uint16)
+	ctx, cancel := context.WithTimeout(context.Background(), time.Millisecond*time.Duration(timeout))
-	go func() {
+	defer cancel()
-		t, err := proxy.URLTest(url)
-		if err != nil {
-			sigCh <- 0
-		}
-		sigCh <- t
-	}()
 
-	select {
+	delay, err := proxy.URLTest(ctx, url)
-	case <-time.After(time.Millisecond * time.Duration(timeout)):
+	if ctx.Err() != nil {
-		render.Status(r, http.StatusRequestTimeout)
+		render.Status(r, http.StatusGatewayTimeout)
 		render.JSON(w, r, ErrRequestTimeout)
-	case t := <-sigCh:
+		return
-		if t == 0 {
+	}
+
+	if err != nil || delay == 0 {
 		render.Status(r, http.StatusServiceUnavailable)
 		render.JSON(w, r, newError("An error occurred in the delay test"))
-		} else {
+		return
+	}
+
 	render.JSON(w, r, render.M{
-				"delay": t,
+		"delay": delay,
 	})
 }
-	}
-}

hub/route/server.go

@@ -1,17 +1,20 @@
 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 (
@@ -19,6 +22,12 @@ var (
 	serverAddr   = ""
 
 	uiPath = ""
+
+	upgrader = websocket.Upgrader{
+		CheckOrigin: func(r *http.Request) bool {
+			return true
+		},
+	}
 )
 
 type Traffic struct {
@@ -47,15 +56,14 @@ func Start(addr string, secret string) {
 		MaxAge:         300,
 	})
 
-	root := chi.NewRouter().With(jsonContentType)
+	r.Use(cors.Handler)
-	root.Get("/traffic", traffic)
-	root.Get("/logs", getLogs)
-
 	r.Get("/", hello)
 	r.Group(func(r chi.Router) {
-		r.Use(cors.Handler, authentication)
+		r.Use(authentication)
 
-		r.Mount("/", root)
+		r.Get("/logs", getLogs)
+		r.Get("/traffic", traffic)
+		r.Get("/version", version)
 		r.Mount("/configs", configRouter())
 		r.Mount("/proxies", proxyRouter())
 		r.Mount("/rules", ruleRouter())
@@ -64,7 +72,7 @@ func Start(addr string, secret string) {
 	if uiPath != "" {
 		r.Group(func(r chi.Router) {
 			fs := http.StripPrefix("/ui", http.FileServer(http.Dir(uiPath)))
-			r.Get("/ui", http.RedirectHandler("/ui/", 301).ServeHTTP)
+			r.Get("/ui", http.RedirectHandler("/ui/", http.StatusTemporaryRedirect).ServeHTTP)
 			r.Get("/ui/*", func(w http.ResponseWriter, r *http.Request) {
 				fs.ServeHTTP(w, r)
 			})
@@ -78,24 +86,28 @@ func Start(addr string, secret string) {
 	}
 }
 
-func jsonContentType(next http.Handler) http.Handler {
-	fn := func(w http.ResponseWriter, r *http.Request) {
-		w.Header().Set("Content-Type", "application/json")
-		next.ServeHTTP(w, r)
-	}
-	return http.HandlerFunc(fn)
-}
-
 func authentication(next http.Handler) http.Handler {
 	fn := func(w http.ResponseWriter, r *http.Request) {
-		header := r.Header.Get("Authorization")
-		text := strings.SplitN(header, " ", 2)
-
 		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 {
@@ -113,19 +125,44 @@ func hello(w http.ResponseWriter, r *http.Request) {
 }
 
 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(w).Encode(Traffic{
+		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
+		}
 	}
 }
 
@@ -147,20 +184,51 @@ func getLogs(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	sub := log.Subscribe()
+	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(w).Encode(Log{
+		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})
+}

log/log.go

@@ -2,6 +2,7 @@ package log
 
 import (
 	"fmt"
+	"os"
 
 	"github.com/Dreamacro/clash/common/observable"
 
@@ -15,6 +16,7 @@ var (
 )
 
 func init() {
+	log.SetOutput(os.Stdout)
 	log.SetLevel(log.DebugLevel)
 }
 
@@ -60,6 +62,11 @@ func Subscribe() observable.Subscription {
 	return sub
 }
 
+func UnSubscribe(sub observable.Subscription) {
+	source.UnSubscribe(sub)
+	return
+}
+
 func Level() LogLevel {
 	return level
 }

main.go

@@ -33,9 +33,6 @@ func main() {
 		return
 	}
 
-	// enable tls 1.3 and remove when go 1.13
-	os.Setenv("GODEBUG", os.Getenv("GODEBUG")+",tls13=1")
-
 	if homedir != "" {
 		if !filepath.IsAbs(homedir) {
 			currentDir, _ := os.Getwd()

proxy/auth/auth.go

@@ -0,0 +1,17 @@
+package auth
+
+import (
+	"github.com/Dreamacro/clash/component/auth"
+)
+
+var (
+	authenticator auth.Authenticator
+)
+
+func Authenticator() auth.Authenticator {
+	return authenticator
+}
+
+func SetAuthenticator(au auth.Authenticator) {
+	authenticator = au
+}

proxy/http/server.go

@@ -2,11 +2,17 @@ package http
 
 import (
 	"bufio"
+	"encoding/base64"
 	"net"
 	"net/http"
+	"strings"
+	"time"
 
 	adapters "github.com/Dreamacro/clash/adapters/inbound"
+	"github.com/Dreamacro/clash/common/cache"
+	"github.com/Dreamacro/clash/component/auth"
 	"github.com/Dreamacro/clash/log"
+	authStore "github.com/Dreamacro/clash/proxy/auth"
 	"github.com/Dreamacro/clash/tunnel"
 )
 
@@ -18,6 +24,7 @@ type HttpListener struct {
 	net.Listener
 	address string
 	closed  bool
+	cache   *cache.Cache
 }
 
 func NewHttpProxy(addr string) (*HttpListener, error) {
@@ -25,10 +32,11 @@ func NewHttpProxy(addr string) (*HttpListener, error) {
 	if err != nil {
 		return nil, err
 	}
-	hl := &HttpListener{l, addr, false}
+	hl := &HttpListener{l, addr, false, cache.New(30 * time.Second)}
 
 	go func() {
 		log.Infoln("HTTP proxy listening at: %s", addr)
+
 		for {
 			c, err := hl.Accept()
 			if err != nil {
@@ -37,7 +45,7 @@ func NewHttpProxy(addr string) (*HttpListener, error) {
 				}
 				continue
 			}
-			go handleConn(c)
+			go handleConn(c, hl.cache)
 		}
 	}()
 
@@ -53,7 +61,19 @@ func (l *HttpListener) Address() string {
 	return l.address
 }
 
-func handleConn(conn net.Conn) {
+func canActivate(loginStr string, authenticator auth.Authenticator, cache *cache.Cache) (ret bool) {
+	if result := cache.Get(loginStr); result != nil {
+		ret = result.(bool)
+	}
+	loginData, err := base64.StdEncoding.DecodeString(loginStr)
+	login := strings.Split(string(loginData), ":")
+	ret = err == nil && len(login) == 2 && authenticator.Verify(login[0], login[1])
+
+	cache.Put(loginStr, ret, time.Minute)
+	return
+}
+
+func handleConn(conn net.Conn, cache *cache.Cache) {
 	br := bufio.NewReader(conn)
 	request, err := http.ReadRequest(br)
 	if err != nil || request.URL.Host == "" {
@@ -61,6 +81,20 @@ func handleConn(conn net.Conn) {
 		return
 	}
 
+	authenticator := authStore.Authenticator()
+	if authenticator != nil {
+		if authStrings := strings.Split(request.Header.Get("Proxy-Authorization"), " "); len(authStrings) != 2 {
+			_, err = conn.Write([]byte("HTTP/1.1 407 Proxy Authentication Required\r\nProxy-Authenticate: Basic\r\n\r\n"))
+			conn.Close()
+			return
+		} else if !canActivate(authStrings[1], authenticator, cache) {
+			conn.Write([]byte("HTTP/1.1 403 Forbidden\r\n\r\n"))
+			log.Infoln("Auth failed from %s", conn.RemoteAddr().String())
+			conn.Close()
+			return
+		}
+	}
+
 	if request.Method == http.MethodConnect {
 		_, err := conn.Write([]byte("HTTP/1.1 200 Connection established\r\n\r\n"))
 		if err != nil {

proxy/listener.go

@@ -12,8 +12,10 @@ import (
 
 var (
 	allowLan    = false
+	bindAddress = "*"
 
 	socksListener    *socks.SockListener
+	socksUDPListener *socks.SockUDPListener
 	httpListener     *http.HttpListener
 	redirListener    *redir.RedirListener
 )
@@ -33,12 +35,20 @@ func AllowLan() bool {
 	return allowLan
 }
 
+func BindAddress() string {
+	return bindAddress
+}
+
 func SetAllowLan(al bool) {
 	allowLan = al
 }
 
+func SetBindAddress(host string) {
+	bindAddress = host
+}
+
 func ReCreateHTTP(port int) error {
-	addr := genAddr(port, allowLan)
+	addr := genAddr(bindAddress, port, allowLan)
 
 	if httpListener != nil {
 		if httpListener.Address() == addr {
@@ -62,7 +72,7 @@ func ReCreateHTTP(port int) error {
 }
 
 func ReCreateSocks(port int) error {
-	addr := genAddr(port, allowLan)
+	addr := genAddr(bindAddress, port, allowLan)
 
 	if socksListener != nil {
 		if socksListener.Address() == addr {
@@ -82,11 +92,29 @@ func ReCreateSocks(port int) error {
 		return err
 	}
 
+	return reCreateSocksUDP(addr)
+}
+
+func reCreateSocksUDP(addr string) error {
+	if socksUDPListener != nil {
+		if socksUDPListener.Address() == addr {
+			return nil
+		}
+		socksUDPListener.Close()
+		socksUDPListener = nil
+	}
+
+	var err error
+	socksUDPListener, err = socks.NewSocksUDPProxy(addr)
+	if err != nil {
+		return err
+	}
+
 	return nil
 }
 
 func ReCreateRedir(port int) error {
-	addr := genAddr(port, allowLan)
+	addr := genAddr(bindAddress, port, allowLan)
 
 	if redirListener != nil {
 		if redirListener.Address() == addr {
@@ -142,9 +170,14 @@ func portIsZero(addr string) bool {
 	return false
 }
 
-func genAddr(port int, allowLan bool) string {
+func genAddr(host string, port int, allowLan bool) string {
 	if allowLan {
+		if host == "*" {
 			return fmt.Sprintf(":%d", port)
+		} else {
+			return fmt.Sprintf("%s:%d", host, port)
 		}
+	}
+
 	return fmt.Sprintf("127.0.0.1:%d", port)
 }

proxy/redir/tcp.go

@@ -59,5 +59,5 @@ func handleRedir(conn net.Conn) {
 		return
 	}
 	conn.(*net.TCPConn).SetKeepAlive(true)
-	tun.Add(adapters.NewSocket(target, conn, C.REDIR))
+	tun.Add(adapters.NewSocket(target, conn, C.REDIR, C.TCP))
 }

proxy/redir/tcp_darwin.go

@@ -5,10 +5,10 @@ import (
 	"syscall"
 	"unsafe"
 
-	"github.com/Dreamacro/go-shadowsocks2/socks"
+	"github.com/Dreamacro/clash/component/socks5"
 )
 
-func parserPacket(c net.Conn) (socks.Addr, error) {
+func parserPacket(c net.Conn) (socks5.Addr, error) {
 	const (
 		PfInout     = 0
 		PfIn        = 1
@@ -51,7 +51,7 @@ func parserPacket(c net.Conn) (socks.Addr, error) {
 	}
 
 	addr := make([]byte, 1+net.IPv4len+2)
-	addr[0] = socks.AtypIPv4
+	addr[0] = socks5.AtypIPv4
 	copy(addr[1:1+net.IPv4len], nl.rdaddr[:4])
 	copy(addr[1+net.IPv4len:], nl.rdxport[:2])
 	return addr, nil

proxy/redir/tcp_freebsd.go

@@ -6,7 +6,7 @@ import (
 	"syscall"
 	"unsafe"
 
-	"github.com/Dreamacro/go-shadowsocks2/socks"
+	"github.com/Dreamacro/clash/component/socks5"
 )
 
 const (
@@ -14,7 +14,7 @@ const (
 	IP6T_SO_ORIGINAL_DST = 80 // from linux/include/uapi/linux/netfilter_ipv6/ip6_tables.h
 )
 
-func parserPacket(conn net.Conn) (socks.Addr, error) {
+func parserPacket(conn net.Conn) (socks5.Addr, error) {
 	c, ok := conn.(*net.TCPConn)
 	if !ok {
 		return nil, errors.New("only work with TCP connection")
@@ -25,7 +25,7 @@ func parserPacket(conn net.Conn) (socks.Addr, error) {
 		return nil, err
 	}
 
-	var addr socks.Addr
+	var addr socks5.Addr
 
 	rc.Control(func(fd uintptr) {
 		addr, err = getorigdst(fd)
@@ -35,7 +35,7 @@ func parserPacket(conn net.Conn) (socks.Addr, error) {
 }
 
 // Call getorigdst() from linux/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
-func getorigdst(fd uintptr) (socks.Addr, error) {
+func getorigdst(fd uintptr) (socks5.Addr, error) {
 	raw := syscall.RawSockaddrInet4{}
 	siz := unsafe.Sizeof(raw)
 	_, _, err := syscall.Syscall6(syscall.SYS_GETSOCKOPT, fd, syscall.IPPROTO_IP, SO_ORIGINAL_DST, uintptr(unsafe.Pointer(&raw)), uintptr(unsafe.Pointer(&siz)), 0)
@@ -44,7 +44,7 @@ func getorigdst(fd uintptr) (socks.Addr, error) {
 	}
 
 	addr := make([]byte, 1+net.IPv4len+2)
-	addr[0] = socks.AtypIPv4
+	addr[0] = socks5.AtypIPv4
 	copy(addr[1:1+net.IPv4len], raw.Addr[:])
 	port := (*[2]byte)(unsafe.Pointer(&raw.Port)) // big-endian
 	addr[1+net.IPv4len], addr[1+net.IPv4len+1] = port[0], port[1]

proxy/redir/tcp_linux.go

@@ -6,7 +6,7 @@ import (
 	"syscall"
 	"unsafe"
 
-	"github.com/Dreamacro/go-shadowsocks2/socks"
+	"github.com/Dreamacro/clash/component/socks5"
 )
 
 const (
@@ -14,7 +14,7 @@ const (
 	IP6T_SO_ORIGINAL_DST = 80 // from linux/include/uapi/linux/netfilter_ipv6/ip6_tables.h
 )
 
-func parserPacket(conn net.Conn) (socks.Addr, error) {
+func parserPacket(conn net.Conn) (socks5.Addr, error) {
 	c, ok := conn.(*net.TCPConn)
 	if !ok {
 		return nil, errors.New("only work with TCP connection")
@@ -25,7 +25,7 @@ func parserPacket(conn net.Conn) (socks.Addr, error) {
 		return nil, err
 	}
 
-	var addr socks.Addr
+	var addr socks5.Addr
 
 	rc.Control(func(fd uintptr) {
 		addr, err = getorigdst(fd)
@@ -35,7 +35,7 @@ func parserPacket(conn net.Conn) (socks.Addr, error) {
 }
 
 // Call getorigdst() from linux/net/ipv4/netfilter/nf_conntrack_l3proto_ipv4.c
-func getorigdst(fd uintptr) (socks.Addr, error) {
+func getorigdst(fd uintptr) (socks5.Addr, error) {
 	raw := syscall.RawSockaddrInet4{}
 	siz := unsafe.Sizeof(raw)
 	if err := socketcall(GETSOCKOPT, fd, syscall.IPPROTO_IP, SO_ORIGINAL_DST, uintptr(unsafe.Pointer(&raw)), uintptr(unsafe.Pointer(&siz)), 0); err != nil {
@@ -43,7 +43,7 @@ func getorigdst(fd uintptr) (socks.Addr, error) {
 	}
 
 	addr := make([]byte, 1+net.IPv4len+2)
-	addr[0] = socks.AtypIPv4
+	addr[0] = socks5.AtypIPv4
 	copy(addr[1:1+net.IPv4len], raw.Addr[:])
 	port := (*[2]byte)(unsafe.Pointer(&raw.Port)) // big-endian
 	addr[1+net.IPv4len], addr[1+net.IPv4len+1] = port[0], port[1]

proxy/redir/tcp_windows.go

@@ -4,9 +4,9 @@ import (
 	"errors"
 	"net"
 
-	"github.com/Dreamacro/go-shadowsocks2/socks"
+	"github.com/Dreamacro/clash/component/socks5"
 )
 
-func parserPacket(conn net.Conn) (socks.Addr, error) {
+func parserPacket(conn net.Conn) (socks5.Addr, error) {
 	return nil, errors.New("Windows not support yet")
 }

proxy/socks/tcp.go

@@ -1,14 +1,16 @@
 package socks
 
 import (
+	"io"
+	"io/ioutil"
 	"net"
 
-	"github.com/Dreamacro/clash/adapters/inbound"
+	adapters "github.com/Dreamacro/clash/adapters/inbound"
+	"github.com/Dreamacro/clash/component/socks5"
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/log"
+	authStore "github.com/Dreamacro/clash/proxy/auth"
 	"github.com/Dreamacro/clash/tunnel"
-
-	"github.com/Dreamacro/go-shadowsocks2/socks"
 )
 
 var (
@@ -55,11 +57,16 @@ func (l *SockListener) Address() string {
 }
 
 func handleSocks(conn net.Conn) {
-	target, err := socks.Handshake(conn)
+	target, command, err := socks5.ServerHandshake(conn, authStore.Authenticator())
 	if err != nil {
 		conn.Close()
 		return
 	}
 	conn.(*net.TCPConn).SetKeepAlive(true)
-	tun.Add(adapters.NewSocket(target, conn, C.SOCKS))
+	if command == socks5.CmdUDPAssociate {
+		defer conn.Close()
+		io.Copy(ioutil.Discard, conn)
+		return
+	}
+	tun.Add(adapters.NewSocket(target, conn, C.SOCKS, C.TCP))
 }

proxy/socks/udp.go

@@ -1 +1,68 @@
 package socks
+
+import (
+	"bytes"
+	"net"
+
+	adapters "github.com/Dreamacro/clash/adapters/inbound"
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/component/socks5"
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type SockUDPListener struct {
+	net.PacketConn
+	address string
+	closed  bool
+}
+
+func NewSocksUDPProxy(addr string) (*SockUDPListener, error) {
+	l, err := net.ListenPacket("udp", addr)
+	if err != nil {
+		return nil, err
+	}
+
+	sl := &SockUDPListener{l, addr, false}
+	go func() {
+		for {
+			buf := pool.BufPool.Get().([]byte)
+			n, remoteAddr, err := l.ReadFrom(buf)
+			if err != nil {
+				pool.BufPool.Put(buf[:cap(buf)])
+				if sl.closed {
+					break
+				}
+				continue
+			}
+			handleSocksUDP(l, buf[:n], remoteAddr)
+		}
+	}()
+
+	return sl, nil
+}
+
+func (l *SockUDPListener) Close() error {
+	l.closed = true
+	return l.PacketConn.Close()
+}
+
+func (l *SockUDPListener) Address() string {
+	return l.address
+}
+
+func handleSocksUDP(pc net.PacketConn, buf []byte, addr net.Addr) {
+	target, payload, err := socks5.DecodeUDPPacket(buf)
+	if err != nil {
+		// Unresolved UDP packet, return buffer to the pool
+		pool.BufPool.Put(buf[:cap(buf)])
+		return
+	}
+	conn := &fakeConn{
+		PacketConn: pc,
+		remoteAddr: addr,
+		targetAddr: target,
+		buffer:     bytes.NewBuffer(payload),
+		bufRef:     buf,
+	}
+	tun.Add(adapters.NewSocket(target, conn, C.SOCKS, C.UDP))
+}

proxy/socks/utils.go

@@ -0,0 +1,39 @@
+package socks
+
+import (
+	"bytes"
+	"net"
+
+	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/component/socks5"
+)
+
+type fakeConn struct {
+	net.PacketConn
+	remoteAddr net.Addr
+	targetAddr socks5.Addr
+	buffer     *bytes.Buffer
+	bufRef     []byte
+}
+
+func (c *fakeConn) Read(b []byte) (n int, err error) {
+	return c.buffer.Read(b)
+}
+
+func (c *fakeConn) Write(b []byte) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(c.targetAddr, b)
+	if err != nil {
+		return
+	}
+	return c.PacketConn.WriteTo(packet, c.remoteAddr)
+}
+
+func (c *fakeConn) RemoteAddr() net.Addr {
+	return c.remoteAddr
+}
+
+func (c *fakeConn) Close() error {
+	err := c.PacketConn.Close()
+	pool.BufPool.Put(c.bufRef[:cap(c.bufRef)])
+	return err
+}

rules/geoip.go

@@ -24,10 +24,10 @@ func (g *GEOIP) RuleType() C.RuleType {
 }
 
 func (g *GEOIP) IsMatch(metadata *C.Metadata) bool {
-	if metadata.IP == nil {
+	if metadata.DstIP == nil {
 		return false
 	}
-	record, _ := mmdb.Country(*metadata.IP)
+	record, _ := mmdb.Country(*metadata.DstIP)
 	return record.Country.IsoCode == g.country
 }
 

rules/ipcidr.go

@@ -14,15 +14,15 @@ type IPCIDR struct {
 
 func (i *IPCIDR) RuleType() C.RuleType {
 	if i.isSourceIP {
-		return C.SourceIPCIDR
+		return C.SrcIPCIDR
 	}
 	return C.IPCIDR
 }
 
 func (i *IPCIDR) IsMatch(metadata *C.Metadata) bool {
-	ip := metadata.IP
+	ip := metadata.DstIP
 	if i.isSourceIP {
-		ip = metadata.SourceIP
+		ip = metadata.SrcIP
 	}
 	return ip != nil && i.ipnet.Contains(*ip)
 }

rules/port.go

@@ -0,0 +1,47 @@
+package rules
+
+import (
+	"strconv"
+
+	C "github.com/Dreamacro/clash/constant"
+)
+
+type Port struct {
+	adapter  string
+	port     string
+	isSource bool
+}
+
+func (p *Port) RuleType() C.RuleType {
+	if p.isSource {
+		return C.SrcPort
+	}
+	return C.DstPort
+}
+
+func (p *Port) IsMatch(metadata *C.Metadata) bool {
+	if p.isSource {
+		return metadata.SrcPort == p.port
+	}
+	return metadata.DstPort == p.port
+}
+
+func (p *Port) Adapter() string {
+	return p.adapter
+}
+
+func (p *Port) Payload() string {
+	return p.port
+}
+
+func NewPort(port string, adapter string, isSource bool) *Port {
+	_, err := strconv.Atoi(port)
+	if err != nil {
+		return nil
+	}
+	return &Port{
+		adapter:  adapter,
+		port:     port,
+		isSource: isSource,
+	}
+}

tunnel/connection.go

@@ -6,26 +6,20 @@ import (
 	"net"
 	"net/http"
 	"strings"
-	"sync"
 	"time"
 
 	adapters "github.com/Dreamacro/clash/adapters/inbound"
+	"github.com/Dreamacro/clash/common/pool"
 )
 
-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
-)
-
-var bufPool = sync.Pool{New: func() interface{} { return make([]byte, bufferSize) }}
-
 func (t *Tunnel) handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
 	conn := newTrafficTrack(outbound, t.traffic)
 	req := request.R
 	host := req.Host
 
+	inboundReeder := bufio.NewReader(request)
+	outboundReeder := bufio.NewReader(conn)
+
 	for {
 		keepAlive := strings.TrimSpace(strings.ToLower(req.Header.Get("Proxy-Connection"))) == "keep-alive"
 
@@ -36,13 +30,23 @@ func (t *Tunnel) handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
 		if err != nil {
 			break
 		}
-		br := bufio.NewReader(conn)
+
-		resp, err := http.ReadResponse(br, req)
+	handleResponse:
+		resp, err := http.ReadResponse(outboundReeder, req)
 		if err != nil {
 			break
 		}
 		adapters.RemoveHopByHopHeaders(resp.Header)
-		if resp.ContentLength >= 0 {
+
+		if resp.StatusCode == http.StatusContinue {
+			err = resp.Write(request)
+			if err != nil {
+				break
+			}
+			goto handleResponse
+		}
+
+		if keepAlive || resp.ContentLength >= 0 {
 			resp.Header.Set("Proxy-Connection", "keep-alive")
 			resp.Header.Set("Connection", "keep-alive")
 			resp.Header.Set("Keep-Alive", "timeout=4")
@@ -50,16 +54,12 @@ func (t *Tunnel) handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
 		} else {
 			resp.Close = true
 		}
-		err = resp.Write(request.Conn())
+		err = resp.Write(request)
 		if err != nil || resp.Close {
 			break
 		}
 
-		if !keepAlive {
+		req, err = http.ReadRequest(inboundReeder)
-			break
-		}
-
-		req, err = http.ReadRequest(bufio.NewReader(request.Conn()))
 		if err != nil {
 			break
 		}
@@ -72,9 +72,44 @@ func (t *Tunnel) handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
 	}
 }
 
-func (t *Tunnel) handleSOCKS(request *adapters.SocketAdapter, outbound net.Conn) {
+func (t *Tunnel) handleUDPToRemote(conn net.Conn, pc net.PacketConn, addr net.Addr) {
+	buf := pool.BufPool.Get().([]byte)
+	defer pool.BufPool.Put(buf[:cap(buf)])
+
+	n, err := conn.Read(buf)
+	if err != nil {
+		return
+	}
+	if _, err = pc.WriteTo(buf[:n], addr); err != nil {
+		return
+	}
+	t.traffic.Up() <- int64(n)
+}
+
+func (t *Tunnel) handleUDPToLocal(conn net.Conn, pc net.PacketConn, key string, timeout time.Duration) {
+	buf := pool.BufPool.Get().([]byte)
+	defer pool.BufPool.Put(buf[:cap(buf)])
+	defer t.natTable.Delete(key)
+	defer pc.Close()
+
+	for {
+		pc.SetReadDeadline(time.Now().Add(timeout))
+		n, _, err := pc.ReadFrom(buf)
+		if err != nil {
+			return
+		}
+
+		n, err = conn.Write(buf[:n])
+		if err != nil {
+			return
+		}
+		t.traffic.Down() <- int64(n)
+	}
+}
+
+func (t *Tunnel) handleSocket(request *adapters.SocketAdapter, outbound net.Conn) {
 	conn := newTrafficTrack(outbound, t.traffic)
-	relay(request.Conn(), conn)
+	relay(request, conn)
 }
 
 // relay copies between left and right bidirectionally.
@@ -82,16 +117,16 @@ func relay(leftConn, rightConn net.Conn) {
 	ch := make(chan error)
 
 	go func() {
-		buf := bufPool.Get().([]byte)
+		buf := pool.BufPool.Get().([]byte)
 		_, err := io.CopyBuffer(leftConn, rightConn, buf)
-		bufPool.Put(buf[:cap(buf)])
+		pool.BufPool.Put(buf[:cap(buf)])
 		leftConn.SetReadDeadline(time.Now())
 		ch <- err
 	}()
 
-	buf := bufPool.Get().([]byte)
+	buf := pool.BufPool.Get().([]byte)
 	io.CopyBuffer(rightConn, leftConn, buf)
-	bufPool.Put(buf[:cap(buf)])
+	pool.BufPool.Put(buf[:cap(buf)])
 	rightConn.SetReadDeadline(time.Now())
 	<-ch
 }

tunnel/mode.go

@@ -60,6 +60,6 @@ func (m Mode) String() string {
 	case Direct:
 		return "Direct"
 	default:
-		return "Unknow"
+		return "Unknown"
 	}
 }

tunnel/tunnel.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	InboundAdapter "github.com/Dreamacro/clash/adapters/inbound"
+	"github.com/Dreamacro/clash/component/nat"
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/dns"
 	"github.com/Dreamacro/clash/log"
@@ -17,16 +18,23 @@ import (
 var (
 	tunnel *Tunnel
 	once   sync.Once
+
+	// default timeout for UDP session
+	udpTimeout = 60 * time.Second
 )
 
-// Tunnel handle proxy socket and HTTP/SOCKS socket
+// Tunnel handle relay inbound proxy and outbound proxy
 type Tunnel struct {
-	queue      *channels.InfiniteChannel
+	tcpQueue  *channels.InfiniteChannel
+	udpQueue  *channels.InfiniteChannel
+	natTable  *nat.Table
 	rules     []C.Rule
 	proxies   map[string]C.Proxy
-	configLock *sync.RWMutex
+	configMux *sync.RWMutex
 	traffic   *C.Traffic
-	resolver   *dns.Resolver
+
+	// experimental features
+	ignoreResolveFail bool
 
 	// Outbound Rule
 	mode Mode
@@ -34,7 +42,12 @@ type Tunnel struct {
 
 // Add request to queue
 func (t *Tunnel) Add(req C.ServerAdapter) {
-	t.queue.In() <- req
+	switch req.Metadata().NetWork {
+	case C.TCP:
+		t.tcpQueue.In() <- req
+	case C.UDP:
+		t.udpQueue.In() <- req
+	}
 }
 
 // Traffic return traffic of all connections
@@ -49,9 +62,9 @@ func (t *Tunnel) Rules() []C.Rule {
 
 // UpdateRules handle update rules
 func (t *Tunnel) UpdateRules(rules []C.Rule) {
-	t.configLock.Lock()
+	t.configMux.Lock()
 	t.rules = rules
-	t.configLock.Unlock()
+	t.configMux.Unlock()
 }
 
 // Proxies return all proxies
@@ -61,9 +74,16 @@ func (t *Tunnel) Proxies() map[string]C.Proxy {
 
 // UpdateProxies handle update proxies
 func (t *Tunnel) UpdateProxies(proxies map[string]C.Proxy) {
-	t.configLock.Lock()
+	t.configMux.Lock()
 	t.proxies = proxies
-	t.configLock.Unlock()
+	t.configMux.Unlock()
+}
+
+// UpdateExperimental handle update experimental config
+func (t *Tunnel) UpdateExperimental(ignoreResolveFail bool) {
+	t.configMux.Lock()
+	t.ignoreResolveFail = ignoreResolveFail
+	t.configMux.Unlock()
 }
 
 // Mode return current mode
@@ -76,59 +96,45 @@ func (t *Tunnel) SetMode(mode Mode) {
 	t.mode = mode
 }
 
-// SetResolver change the resolver of tunnel
-func (t *Tunnel) SetResolver(resolver *dns.Resolver) {
-	t.resolver = resolver
-}
-
-func (t *Tunnel) hasResolver() bool {
-	return t.resolver != nil
-}
-
 func (t *Tunnel) process() {
-	queue := t.queue.Out()
+	go func() {
-	for {
+		queue := t.udpQueue.Out()
-		elm := <-queue
+		for elm := range queue {
 			conn := elm.(C.ServerAdapter)
-		go t.handleConn(conn)
+			t.handleUDPConn(conn)
+		}
+	}()
+
+	queue := t.tcpQueue.Out()
+	for elm := range queue {
+		conn := elm.(C.ServerAdapter)
+		go t.handleTCPConn(conn)
 	}
 }
 
 func (t *Tunnel) resolveIP(host string) (net.IP, error) {
-	if t.resolver == nil {
+	return dns.ResolveIP(host)
-		ipAddr, err := net.ResolveIPAddr("ip", host)
-		if err != nil {
-			return nil, err
-		}
-
-		return ipAddr.IP, nil
-	}
-
-	return t.resolver.ResolveIP(host)
 }
 
 func (t *Tunnel) needLookupIP(metadata *C.Metadata) bool {
-	return t.hasResolver() && t.resolver.IsMapping() && metadata.Host == "" && metadata.IP != nil
+	return dns.DefaultResolver != nil && (dns.DefaultResolver.IsMapping() || dns.DefaultResolver.IsFakeIP()) && metadata.Host == "" && metadata.DstIP != nil
-}
-
-func (t *Tunnel) handleConn(localConn C.ServerAdapter) {
-	defer localConn.Close()
-	metadata := localConn.Metadata()
-
-	if !metadata.Valid() {
-		log.Warnln("[Metadata] not valid: %#v", metadata)
-		return
 }
 
+func (t *Tunnel) resolveMetadata(metadata *C.Metadata) (C.Proxy, C.Rule, error) {
+	// preprocess enhanced-mode metadata
 	if t.needLookupIP(metadata) {
-		host, exist := t.resolver.IPToHost(*metadata.IP)
+		host, exist := dns.DefaultResolver.IPToHost(*metadata.DstIP)
 		if exist {
 			metadata.Host = host
 			metadata.AddrType = C.AtypDomainName
+			if dns.DefaultResolver.IsFakeIP() {
+				metadata.DstIP = nil
+			}
 		}
 	}
 
 	var proxy C.Proxy
+	var rule C.Rule
 	switch t.mode {
 	case Direct:
 		proxy = t.proxies["DIRECT"]
@@ -137,61 +143,164 @@ func (t *Tunnel) handleConn(localConn C.ServerAdapter) {
 	// Rule
 	default:
 		var err error
-		proxy, err = t.match(metadata)
+		proxy, rule, err = t.match(metadata)
 		if err != nil {
-			return
+			return nil, nil, err
 		}
 	}
+	return proxy, rule, nil
+}
 
-	remoConn, err := proxy.Dial(metadata)
+func (t *Tunnel) handleUDPConn(localConn C.ServerAdapter) {
-	if err != nil {
+	metadata := localConn.Metadata()
-		log.Warnln("Proxy[%s] connect [%s --> %s] error: %s", proxy.Name(), metadata.SourceIP.String(), metadata.String(), err.Error())
+	if !metadata.Valid() {
+		log.Warnln("[Metadata] not valid: %#v", metadata)
 		return
 	}
-	defer remoConn.Close()
+
+	src := localConn.RemoteAddr().String()
+	dst := metadata.RemoteAddress()
+	key := src + "-" + dst
+
+	pc, addr := t.natTable.Get(key)
+	if pc != nil {
+		t.handleUDPToRemote(localConn, pc, addr)
+		return
+	}
+
+	lockKey := key + "-lock"
+	wg, loaded := t.natTable.GetOrCreateLock(lockKey)
+	go func() {
+		if !loaded {
+			wg.Add(1)
+			proxy, rule, err := t.resolveMetadata(metadata)
+			if err != nil {
+				log.Warnln("Parse metadata failed: %s", err.Error())
+				t.natTable.Delete(lockKey)
+				wg.Done()
+				return
+			}
+
+			rawPc, nAddr, err := proxy.DialUDP(metadata)
+			if err != nil {
+				log.Warnln("dial %s error: %s", proxy.Name(), err.Error())
+				t.natTable.Delete(lockKey)
+				wg.Done()
+				return
+			}
+			pc = rawPc
+			addr = nAddr
+
+			if rule != nil {
+				log.Infoln("%s --> %v match %s using %s", metadata.SrcIP.String(), metadata.String(), rule.RuleType().String(), rawPc.Chains().String())
+			} else {
+				log.Infoln("%s --> %v doesn't match any rule using DIRECT", metadata.SrcIP.String(), metadata.String())
+			}
+
+			t.natTable.Set(key, pc, addr)
+			t.natTable.Delete(lockKey)
+			wg.Done()
+			go t.handleUDPToLocal(localConn, pc, key, udpTimeout)
+		}
+
+		wg.Wait()
+		pc, addr := t.natTable.Get(key)
+		if pc != nil {
+			t.handleUDPToRemote(localConn, pc, addr)
+		}
+	}()
+}
+
+func (t *Tunnel) handleTCPConn(localConn C.ServerAdapter) {
+	defer localConn.Close()
+
+	metadata := localConn.Metadata()
+	if !metadata.Valid() {
+		log.Warnln("[Metadata] not valid: %#v", metadata)
+		return
+	}
+
+	proxy, rule, err := t.resolveMetadata(metadata)
+	if err != nil {
+		log.Warnln("Parse metadata failed: %v", err)
+		return
+	}
+
+	remoteConn, err := proxy.Dial(metadata)
+	if err != nil {
+		log.Warnln("dial %s error: %s", proxy.Name(), err.Error())
+		return
+	}
+	defer remoteConn.Close()
+
+	if rule != nil {
+		log.Infoln("%s --> %v match %s using %s", metadata.SrcIP.String(), metadata.String(), rule.RuleType().String(), remoteConn.Chains().String())
+	} else {
+		log.Infoln("%s --> %v doesn't match any rule using DIRECT", metadata.SrcIP.String(), metadata.String())
+	}
 
 	switch adapter := localConn.(type) {
 	case *InboundAdapter.HTTPAdapter:
-		t.handleHTTP(adapter, remoConn)
+		t.handleHTTP(adapter, remoteConn)
 	case *InboundAdapter.SocketAdapter:
-		t.handleSOCKS(adapter, remoConn)
+		t.handleSocket(adapter, remoteConn)
 	}
 }
 
 func (t *Tunnel) shouldResolveIP(rule C.Rule, metadata *C.Metadata) bool {
-	return (rule.RuleType() == C.GEOIP || rule.RuleType() == C.IPCIDR) && metadata.Host != "" && metadata.IP == nil
+	return (rule.RuleType() == C.GEOIP || rule.RuleType() == C.IPCIDR) && metadata.Host != "" && metadata.DstIP == nil
 }
 
-func (t *Tunnel) match(metadata *C.Metadata) (C.Proxy, error) {
+func (t *Tunnel) match(metadata *C.Metadata) (C.Proxy, C.Rule, error) {
-	t.configLock.RLock()
+	t.configMux.RLock()
-	defer t.configLock.RUnlock()
+	defer t.configMux.RUnlock()
+
+	var resolved bool
+
+	if node := dns.DefaultHosts.Search(metadata.Host); node != nil {
+		ip := node.Data.(net.IP)
+		metadata.DstIP = &ip
+		resolved = true
+	}
 
 	for _, rule := range t.rules {
-		if t.shouldResolveIP(rule, metadata) {
+		if !resolved && t.shouldResolveIP(rule, metadata) {
 			ip, err := t.resolveIP(metadata.Host)
 			if err != nil {
-				return nil, fmt.Errorf("[DNS] resolve %s error: %s", metadata.Host, err.Error())
+				if !t.ignoreResolveFail {
+					return nil, nil, fmt.Errorf("[DNS] resolve %s error: %s", metadata.Host, err.Error())
 				}
+				log.Debugln("[DNS] resolve %s error: %s", metadata.Host, err.Error())
+			} else {
 				log.Debugln("[DNS] %s --> %s", metadata.Host, ip.String())
-			metadata.IP = &ip
+				metadata.DstIP = &ip
+			}
+			resolved = true
 		}
 
 		if rule.IsMatch(metadata) {
-			if a, ok := t.proxies[rule.Adapter()]; ok {
+			adapter, ok := t.proxies[rule.Adapter()]
-				log.Infoln("%s --> %v match %s using %s", metadata.SourceIP.String(), metadata.String(), rule.RuleType().String(), rule.Adapter())
+			if !ok {
-				return a, nil
+				continue
+			}
+
+			if metadata.NetWork == C.UDP && !adapter.SupportUDP() {
+				log.Debugln("%v UDP is not supported", adapter.Name())
+				continue
+			}
+			return adapter, rule, nil
 		}
 	}
-	}
+	return t.proxies["DIRECT"], nil, nil
-	log.Infoln("%s --> %v doesn't match any rule using DIRECT", metadata.SourceIP.String(), metadata.String())
-	return t.proxies["DIRECT"], nil
 }
 
 func newTunnel() *Tunnel {
 	return &Tunnel{
-		queue:      channels.NewInfiniteChannel(),
+		tcpQueue:  channels.NewInfiniteChannel(),
+		udpQueue:  channels.NewInfiniteChannel(),
+		natTable:  nat.New(),
 		proxies:   make(map[string]C.Proxy),
-		configLock: &sync.RWMutex{},
+		configMux: &sync.RWMutex{},
 		traffic:   C.NewTraffic(time.Second),
 		mode:      Rule,
 	}