Chore: update dependencies and README.md

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

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,96 @@
+---
+name: Bug report
+about: Create a report to help us improve
+title: "[Bug]"
+labels: ''
+assignees: ''
+
+---
+
+<!-- The English version is available. -->
+感谢你向 Clash Core 提交 issue！
+在提交之前，请确认：
+
+- [ ] 我已经在 [Issue Tracker](……/) 中找过我要提出的问题
+- [ ] 这是 Clash 核心的问题，并非我所使用的 Clash 衍生版本（如 Openclash、Koolclash 等）的特定问题
+- [ ] 我已经使用 Clash core 的 dev 分支版本测试过，问题依旧存在
+- [ ] 如果你可以自己 debug 并解决的话，提交 PR 吧！
+
+请注意，如果你并没有遵照这个 issue template 填写内容，我们将直接关闭这个 issue。
+
+<!--
+Thanks for submitting an issue towards the Clash core!
+But before so, please do the following checklist:
+
+- [ ] Is this something you can **debug and fix**? Send a pull request! Bug fixes and documentation fixes are welcome.
+- [ ] Your issue may already be reported! Please search on the [issue tracker](……/) before creating one.
+- [ ] I have tested using the dev branch, and the issue still exists.
+- [ ] This is an issue related to the Clash core, not to the derivatives of Clash, like Openclash or Koolclash
+
+Please understand that we close issues that fail to follow the issue template.
+-->
+
+我都确认过了，我要继续提交。
+<!-- None of the above, create a bug report -->
+------------------------------------------------------------------
+
+请附上任何可以帮助我们解决这个问题的信息，如果我们收到的信息不足，我们将对这个 issue 加上 *Needs more information* 标记并在收到更多资讯之前关闭 issue。
+<!-- Make sure to add **all the information needed to understand the bug** so that someone can help. If the info is missing we'll add the 'Needs more information' label and close the issue until there is enough information. -->
+
+### clash core config
+<!--
+在下方附上 Clash core 脱敏后配置文件的内容
+Paste the Clash core configuration below.
+-->
+```
+……
+```
+
+### Clash log
+<!--
+在下方附上 Clash Core 的日志，log level 最好使用 DEBUG
+Paste the Clash core log below with the log level set to `DEBUG`.
+-->
+```
+……
+```
+
+### 环境 Environment
+
+* Clash Core 的操作系统 (the OS that the Clash core is running on)
+……
+* 使用者的操作系统 (the OS running on the client)
+……
+* 网路环境或拓扑 (network conditions/topology)
+……
+* iptables，如果适用 (if applicable)
+……
+* ISP 有没有进行 DNS 污染 (is your ISP performing DNS pollution?)
+……
+* 其他
+……
+
+### 说明 Description
+
+<!--
+请详细、清晰地表达你要提出的论述，例如这个问题如何影响到你？你想实现什么功能？
+-->
+
+### 重现问题的具体布骤 Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. ……
+
+**我预期会发生……？**
+<!-- **Expected behavior:** [What you expected to happen] -->
+
+**实际上发生了什麽？**
+<!-- **Actual behavior:** [What actually happened] -->
+
+### 可能的解决方案 Possible Solution
+<!-- 此项非必须，但是如果你有想法的话欢迎提出。 -->
+<!-- Not obligatory, but suggest a fix/reason for the bug, -->
+<!-- or ideas how to implement the addition or change -->
+
+### 更多信息 More Information

.github/ISSUE_TEMPLATE/feature_request.md

@@ -0,0 +1,78 @@
+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[Feature]"
+labels: ''
+assignees: ''
+
+---
+
+<!-- The English version is available. -->
+感谢你向 Clash Core 提交 Feature Request！
+在提交之前，请确认：
+
+- [ ] 我已经在 [Issue Tracker](……/) 中找过我要提出的请求
+
+请注意，如果你并没有遵照这个 issue template 填写内容，我们将直接关闭这个 issue。
+
+<!--
+Thanks for submitting a feature request towards the Clash core!
+But before so, please do the following checklist:
+
+- [ ] I have searched on the [issue tracker](……/) before creating the issue.
+
+Please understand that we close issues that fail to follow the issue template.
+-->
+
+我都确认过了，我要继续提交。
+<!-- None of the above, create a feature request -->
+------------------------------------------------------------------
+
+请附上任何可以帮助我们解决这个问题的信息，如果我们收到的信息不足，我们将对这个 issue 加上 *Needs more information* 标记并在收到更多资讯之前关闭 issue。
+<!-- Make sure to add **all the information needed to understand the bug** so that someone can help. If the info is missing we'll add the 'Needs more information' label and close the issue until there is enough information. -->
+
+### Clash core config
+<!--
+在下方附上 Clash Core 脱敏后的配置内容
+Paste the Clash core configuration below.
+-->
+```
+……
+```
+
+### Clash log
+<!--
+在下方附上 Clash Core 的日志，log level 请使用 DEBUG
+Paste the Clash core log below with the log level set to `DEBUG`.
+-->
+```
+……
+```
+
+### 环境 Environment
+
+* Clash Core 的操作系统 (the OS that the Clash core is running on)
+……
+* 使用者的操作系统 (the OS running on the client)
+……
+* 网路环境或拓扑 (network conditions/topology)
+……
+* iptables，如果适用 (if applicable)
+……
+* ISP 有没有进行 DNS 污染 (is your ISP performing DNS pollution?)
+……
+* 其他
+……
+
+### 说明 Description
+
+<!--
+请详细、清晰地表达你要提出的论述，例如这个问题如何影响到你？你想实现什么功能？目前 Clash Core 的行为是什麽？
+-->
+
+### 可能的解决方案 Possible Solution
+<!-- 此项非必须，但是如果你有想法的话欢迎提出。 -->
+<!-- Not obligatory, but suggest a fix/reason for the bug, -->
+<!-- or ideas how to implement the addition or change -->
+
+### 更多信息 More Information

.github/workflows/go.yml

@@ -9,7 +9,7 @@ jobs:
       - name: Setup Go
         uses: actions/setup-go@v1
         with:
-          go-version: 1.13.x
+          go-version: 1.14.x
 
       - name: Check out code into the Go module directory
         uses: actions/checkout@v1

Dockerfile

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

Dockerfile.arm32v7

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

Dockerfile.arm64v8

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

README.md

@@ -19,21 +19,25 @@
 
 ## Features
 
-- Local HTTP/HTTPS/SOCKS server
-- GeoIP rule support
-- Supports Vmess, Shadowsocks, Snell and SOCKS5 protocol
-- Supports Netfilter TCP redirecting
-- Comprehensive HTTP API
+- Local HTTP/HTTPS/SOCKS server with/without authentication
+- VMess, Shadowsocks, Trojan (experimental), Snell protocol support for remote connections. UDP is supported.
+- Built-in DNS server that aims to minimize DNS pollution attacks, supports DoH/DoT upstream. Fake IP is also supported.
+- Rules based off domains, GEOIP, IP CIDR or ports to forward packets to different nodes
+- Remote groups allow users to implement powerful rules. Supports automatic fallback, load balancing or auto select node based off latency
+- Remote providers, allowing users to get node lists remotely instead of hardcoding in config
+- Netfilter TCP redirecting. You can deploy Clash on your Internet gateway with `iptables`.
+- Comprehensive HTTP API controller
 
 ## Install
 
-Clash Requires Go >= 1.13. You can build it from source:
+Clash requires Go >= 1.13. You can build it from source:
 
 ```sh
 $ go get -u -v github.com/Dreamacro/clash
 ```
 
-Pre-built binaries are available here: [release](https://github.com/Dreamacro/clash/releases)
+Pre-built binaries are available here: [release](https://github.com/Dreamacro/clash/releases)  
+Pre-built TUN mode binaries are available here: [TUN release](https://github.com/Dreamacro/clash/releases/tag/TUN). Source is not currently available.
 
 Check Clash version with:
 
@@ -41,21 +45,17 @@ Check Clash version with:
 $ clash -v
 ```
 
-## Daemon
+## Daemonize Clash
 
-Unfortunately, there is no native and elegant way to implement daemons on Golang.
+Unfortunately, there is no native or elegant way to implement daemons on Golang. We recommend using third-party daemon management tools like PM2, Supervisor or the like to keep Clash running as a service.
 
-So we can use third-party daemon tools like PM2, Supervisor or the like.
-
-In the case of [pm2](https://github.com/Unitech/pm2), we can start the daemon this way:
+In the case of [pm2](https://github.com/Unitech/pm2), start the daemon this way:
 
 ```sh
 $ pm2 start clash
 ```
 
-If you have Docker installed, you can run clash directly using `docker-compose`.
-
-[Run clash in docker](https://github.com/Dreamacro/clash/wiki/Run-clash-in-docker)
+If you have Docker installed, it's recommended to deploy Clash directly using `docker-compose`: [run Clash in Docker](https://github.com/Dreamacro/clash/wiki/Run-clash-in-docker)
 
 ## Config
 
@@ -92,7 +92,7 @@ allow-lan: false
 # "[aaaa::a8aa:ff:fe09:57d8]": bind a single IPv6 address
 # bind-address: "*"
 
-# Rule / Global/ Direct (default is Rule)
+# Rule / Global / Direct (default is Rule)
 mode: Rule
 
 # set log level to stdout (default is info)
@@ -112,6 +112,7 @@ external-controller: 127.0.0.1:9090
 # experimental feature
 experimental:
   ignore-resolve-fail: true # ignore dns resolve fail, default value is true
+  # interface-name: en0 # outbound interface name
 
 # authentication of local SOCKS5/HTTP(S) server
 # authentication:
@@ -119,19 +120,23 @@ experimental:
 #  - "user2:pass2"
 
 # # experimental hosts, support wildcard (e.g. *.clash.dev Even *.foo.*.example.com)
-# # static domain has a higher priority than wildcard domain (foo.example.com > *.example.com)
+# # static domain has a higher priority than wildcard domain (foo.example.com > *.example.com > .example.com)
 # hosts:
 #   '*.clash.dev': 127.0.0.1
+#   '.dev': 127.0.0.1
 #   'alpha.clash.dev': '::1'
 
 # dns:
   # enable: true # set true to enable dns (default is false)
   # ipv6: false # default is false
   # listen: 0.0.0.0:53
+  # # default-nameserver: # resolve dns nameserver host, should fill pure IP
+  # #   - 114.114.114.114
+  # #   - 8.8.8.8
   # enhanced-mode: redir-host # or fake-ip
   # # fake-ip-range: 198.18.0.1/16 # if you don't know what it is, don't change it
   # fake-ip-filter: # fake ip white domain list
-  #   - *.lan
+  #   - '*.lan'
   #   - localhost.ptlogin2.qq.com
   # nameserver:
   #   - 114.114.114.114
@@ -144,7 +149,7 @@ experimental:
   #   ipcidr: # ips in these subnets will be considered polluted
   #     - 240.0.0.0/4
 
-Proxy:
+proxies:
   # shadowsocks
   # The supported ciphers(encrypt methods):
   #   aes-128-gcm aes-192-gcm aes-256-gcm
@@ -205,6 +210,24 @@ Proxy:
     # ws-path: /path
     # ws-headers:
     #   Host: v2ray.com
+  
+  - name: "vmess-http"
+    type: vmess
+    server: server
+    port: 443
+    uuid: uuid
+    alterId: 32
+    cipher: auto
+    # udp: true
+    # network: http
+    # http-opts:
+    #   # method: "GET"
+    #   # path:
+    #   #   - '/'
+    #   #   - '/video'
+    #   # headers:
+    #   #   Connection:
+    #   #     - keep-alive
 
   # socks5
   - name: "socks"
@@ -237,7 +260,30 @@ Proxy:
       # mode: http # or tls
       # host: bing.com
 
-Proxy Group:
+  # trojan
+  - name: "trojan"
+    type: trojan
+    server: server
+    port: 443
+    password: yourpsk
+    # udp: true
+    # sni: example.com # aka server name
+    # alpn:
+    #   - h2
+    #   - http/1.1
+    # skip-cert-verify: true
+
+proxy-groups:
+  # relay chains the proxies. proxies shall not contain a relay. No UDP support.
+  # Traffic: clash <-> http <-> vmess <-> ss1 <-> ss2 <-> Internet
+  - name: "relay"
+    type: relay
+    proxies:
+      - http
+      - vmess
+      - ss1
+      - ss2
+
   # url-test select which proxy will be used by benchmarking speed to a URL.
   - name: "auto"
     type: url-test
@@ -277,8 +323,34 @@ Proxy Group:
       - ss2
       - vmess1
       - auto
+  
+  - name: UseProvider
+    type: select
+    use:
+      - provider1
+    proxies:
+      - Proxy
+      - DIRECT
 
-Rule:
+proxy-providers:
+  provider1:
+    type: http
+    url: "url"
+    interval: 3600
+    path: ./hk.yaml
+    health-check:
+      enable: true
+      interval: 600
+      url: http://www.gstatic.com/generate_204
+  test:
+    type: file
+    path: /test.yaml
+    health-check:
+      enable: true
+      interval: 36000
+      url: http://www.gstatic.com/generate_204
+
+rules:
   - DOMAIN-SUFFIX,google.com,auto
   - DOMAIN-KEYWORD,google,auto
   - DOMAIN,google.com,auto
@@ -302,7 +374,7 @@ Rule:
 ## Documentations
 https://clash.gitbook.io/
 
-## Thanks
+## Credits
 
 [riobard/go-shadowsocks2](https://github.com/riobard/go-shadowsocks2)
 

adapters/inbound/packet.go

@@ -17,9 +17,9 @@ func (s *PacketAdapter) Metadata() *C.Metadata {
 }
 
 // NewPacket is PacketAdapter generator
-func NewPacket(target socks5.Addr, packet C.UDPPacket, source C.Type, netType C.NetWork) *PacketAdapter {
+func NewPacket(target socks5.Addr, packet C.UDPPacket, source C.Type) *PacketAdapter {
 	metadata := parseSocksAddr(target)
-	metadata.NetWork = netType
+	metadata.NetWork = C.UDP
 	metadata.Type = source
 	if ip, port, err := parseAddr(packet.LocalAddr().String()); err == nil {
 		metadata.SrcIP = ip

adapters/inbound/socket.go

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

adapters/outbound/base.go

@@ -18,6 +18,7 @@ var (
 
 type Base struct {
 	name string
+	addr string
 	tp   C.AdapterType
 	udp  bool
 }
@@ -30,8 +31,12 @@ func (b *Base) Type() C.AdapterType {
 	return b.tp
 }
 
-func (b *Base) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	return nil, nil, errors.New("no support")
+func (b *Base) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
+	return c, errors.New("no support")
+}
+
+func (b *Base) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	return nil, errors.New("no support")
 }
 
 func (b *Base) SupportUDP() bool {
@@ -44,8 +49,16 @@ func (b *Base) MarshalJSON() ([]byte, error) {
 	})
 }
 
-func NewBase(name string, tp C.AdapterType, udp bool) *Base {
-	return &Base{name, tp, udp}
+func (b *Base) Addr() string {
+	return b.addr
+}
+
+func (b *Base) Unwrap(metadata *C.Metadata) C.Proxy {
+	return nil
+}
+
+func NewBase(name string, addr string, tp C.AdapterType, udp bool) *Base {
+	return &Base{name, addr, tp, udp}
 }
 
 type conn struct {
@@ -61,12 +74,17 @@ func (c *conn) AppendToChains(a C.ProxyAdapter) {
 	c.chain = append(c.chain, a.Name())
 }
 
-func newConn(c net.Conn, a C.ProxyAdapter) C.Conn {
+func NewConn(c net.Conn, a C.ProxyAdapter) C.Conn {
 	return &conn{c, []string{a.Name()}}
 }
 
-type packetConn struct {
+type PacketConn interface {
 	net.PacketConn
+	WriteWithMetadata(p []byte, metadata *C.Metadata) (n int, err error)
+}
+
+type packetConn struct {
+	PacketConn
 	chain C.Chain
 }
 
@@ -78,8 +96,8 @@ func (c *packetConn) AppendToChains(a C.ProxyAdapter) {
 	c.chain = append(c.chain, a.Name())
 }
 
-func newPacketConn(c net.PacketConn, a C.ProxyAdapter) C.PacketConn {
-	return &packetConn{c, []string{a.Name()}}
+func newPacketConn(pc PacketConn, a C.ProxyAdapter) C.PacketConn {
+	return &packetConn{pc, []string{a.Name()}}
 }
 
 type Proxy struct {
@@ -189,7 +207,12 @@ func (p *Proxy) URLTest(ctx context.Context, url string) (t uint16, err error) {
 		ExpectContinueTimeout: 1 * time.Second,
 	}
 
-	client := http.Client{Transport: transport}
+	client := http.Client{
+		Transport: transport,
+		CheckRedirect: func(req *http.Request, via []*http.Request) error {
+			return http.ErrUseLastResponse
+		},
+	}
 	resp, err := client.Do(req)
 	if err != nil {
 		return

adapters/outbound/direct.go

@@ -4,6 +4,8 @@ import (
 	"context"
 	"net"
 
+	"github.com/Dreamacro/clash/component/dialer"
+	"github.com/Dreamacro/clash/component/resolver"
 	C "github.com/Dreamacro/clash/constant"
 )
 
@@ -12,30 +14,37 @@ type Direct struct {
 }
 
 func (d *Direct) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	address := net.JoinHostPort(metadata.Host, metadata.DstPort)
-	if metadata.DstIP != nil {
-		address = net.JoinHostPort(metadata.DstIP.String(), metadata.DstPort)
-	}
+	address := net.JoinHostPort(metadata.String(), metadata.DstPort)
 
-	c, err := dialContext(ctx, "tcp", address)
+	c, err := dialer.DialContext(ctx, "tcp", address)
 	if err != nil {
 		return nil, err
 	}
 	tcpKeepAlive(c)
-	return newConn(c, d), nil
+	return NewConn(c, d), nil
 }
 
-func (d *Direct) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	pc, err := net.ListenPacket("udp", "")
+func (d *Direct) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	pc, err := dialer.ListenPacket("udp", "")
 	if err != nil {
-		return nil, nil, err
+		return nil, err
 	}
+	return newPacketConn(&directPacketConn{pc}, d), nil
+}
 
-	addr, err := resolveUDPAddr("udp", metadata.RemoteAddress())
-	if err != nil {
-		return nil, nil, err
+type directPacketConn struct {
+	net.PacketConn
+}
+
+func (dp *directPacketConn) WriteWithMetadata(p []byte, metadata *C.Metadata) (n int, err error) {
+	if !metadata.Resolved() {
+		ip, err := resolver.ResolveIP(metadata.Host)
+		if err != nil {
+			return 0, err
+		}
+		metadata.DstIP = ip
 	}
-	return newPacketConn(pc, d), addr, nil
+	return dp.WriteTo(p, metadata.UDPAddr())
 }
 
 func NewDirect() *Direct {

adapters/outbound/http.go

@@ -13,12 +13,12 @@ import (
 	"net/url"
 	"strconv"
 
+	"github.com/Dreamacro/clash/component/dialer"
 	C "github.com/Dreamacro/clash/constant"
 )
 
 type Http struct {
 	*Base
-	addr      string
 	user      string
 	pass      string
 	tlsConfig *tls.Config
@@ -34,23 +34,35 @@ type HttpOption struct {
 	SkipCertVerify bool   `proxy:"skip-cert-verify,omitempty"`
 }
 
-func (h *Http) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := dialContext(ctx, "tcp", h.addr)
-	if err == nil && h.tlsConfig != nil {
+func (h *Http) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
+	if h.tlsConfig != nil {
 		cc := tls.Client(c, h.tlsConfig)
-		err = cc.Handshake()
+		err := cc.Handshake()
 		c = cc
+		if err != nil {
+			return nil, fmt.Errorf("%s connect error: %w", h.addr, err)
+		}
 	}
 
+	if err := h.shakeHand(metadata, c); err != nil {
+		return nil, err
+	}
+	return c, nil
+}
+
+func (h *Http) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	c, err := dialer.DialContext(ctx, "tcp", h.addr)
 	if err != nil {
 		return nil, fmt.Errorf("%s connect error: %w", h.addr, err)
 	}
 	tcpKeepAlive(c)
-	if err := h.shakeHand(metadata, c); err != nil {
+
+	c, err = h.StreamConn(c, metadata)
+	if err != nil {
 		return nil, err
 	}
 
-	return newConn(c, h), nil
+	return NewConn(c, h), nil
 }
 
 func (h *Http) shakeHand(metadata *C.Metadata, rw io.ReadWriter) error {
@@ -112,9 +124,9 @@ func NewHttp(option HttpOption) *Http {
 	return &Http{
 		Base: &Base{
 			name: option.Name,
+			addr: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 			tp:   C.Http,
 		},
-		addr:      net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 		user:      option.UserName,
 		pass:      option.Password,
 		tlsConfig: tlsConfig,

adapters/outbound/parser.go

@@ -39,7 +39,12 @@ func ParseProxy(mapping map[string]interface{}) (C.Proxy, error) {
 		}
 		proxy = NewHttp(*httpOption)
 	case "vmess":
-		vmessOption := &VmessOption{}
+		vmessOption := &VmessOption{
+			HTTPOpts: HTTPOptions{
+				Method: "GET",
+				Path:   []string{"/"},
+			},
+		}
 		err = decoder.Decode(mapping, vmessOption)
 		if err != nil {
 			break
@@ -52,6 +57,13 @@ func ParseProxy(mapping map[string]interface{}) (C.Proxy, error) {
 			break
 		}
 		proxy, err = NewSnell(*snellOption)
+	case "trojan":
+		trojanOption := &TrojanOption{}
+		err = decoder.Decode(mapping, trojanOption)
+		if err != nil {
+			break
+		}
+		proxy, err = NewTrojan(*trojanOption)
 	default:
 		return nil, fmt.Errorf("Unsupport proxy type: %s", proxyType)
 	}

adapters/outbound/reject.go

@@ -2,6 +2,7 @@ package outbound
 
 import (
 	"context"
+	"errors"
 	"io"
 	"net"
 	"time"
@@ -14,7 +15,11 @@ type Reject struct {
 }
 
 func (r *Reject) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	return newConn(&NopConn{}, r), nil
+	return NewConn(&NopConn{}, r), nil
+}
+
+func (r *Reject) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	return nil, errors.New("match reject rule")
 }
 
 func NewReject() *Reject {
@@ -22,6 +27,7 @@ func NewReject() *Reject {
 		Base: &Base{
 			name: "REJECT",
 			tp:   C.Reject,
+			udp:  true,
 		},
 	}
 }

adapters/outbound/shadowsocks.go

@@ -2,13 +2,14 @@ package outbound
 
 import (
 	"context"
-	"crypto/tls"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net"
 	"strconv"
 
 	"github.com/Dreamacro/clash/common/structure"
+	"github.com/Dreamacro/clash/component/dialer"
 	obfs "github.com/Dreamacro/clash/component/simple-obfs"
 	"github.com/Dreamacro/clash/component/socks5"
 	v2rayObfs "github.com/Dreamacro/clash/component/v2ray-plugin"
@@ -19,7 +20,6 @@ import (
 
 type ShadowSocks struct {
 	*Base
-	server string
 	cipher core.Cipher
 
 	// obfs
@@ -58,48 +58,49 @@ type v2rayObfsOption struct {
 	Mux            bool              `obfs:"mux,omitempty"`
 }
 
-func (ss *ShadowSocks) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := dialContext(ctx, "tcp", ss.server)
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error: %w", ss.server, err)
-	}
-	tcpKeepAlive(c)
+func (ss *ShadowSocks) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
 	switch ss.obfsMode {
 	case "tls":
 		c = obfs.NewTLSObfs(c, ss.obfsOption.Host)
 	case "http":
-		_, port, _ := net.SplitHostPort(ss.server)
+		_, port, _ := net.SplitHostPort(ss.addr)
 		c = obfs.NewHTTPObfs(c, ss.obfsOption.Host, port)
 	case "websocket":
 		var err error
 		c, err = v2rayObfs.NewV2rayObfs(c, ss.v2rayOption)
 		if err != nil {
-			return nil, fmt.Errorf("%s connect error: %w", ss.server, err)
+			return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
 		}
 	}
 	c = ss.cipher.StreamConn(c)
-	_, err = c.Write(serializesSocksAddr(metadata))
-	return newConn(c, ss), err
+	_, err := c.Write(serializesSocksAddr(metadata))
+	return c, err
 }
 
-func (ss *ShadowSocks) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	pc, err := net.ListenPacket("udp", "")
+func (ss *ShadowSocks) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	c, err := dialer.DialContext(ctx, "tcp", ss.addr)
 	if err != nil {
-		return nil, nil, err
+		return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
+	}
+	tcpKeepAlive(c)
+
+	c, err = ss.StreamConn(c, metadata)
+	return NewConn(c, ss), err
+}
+
+func (ss *ShadowSocks) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	pc, err := dialer.ListenPacket("udp", "")
+	if err != nil {
+		return nil, err
 	}
 
-	addr, err := resolveUDPAddr("udp", ss.server)
+	addr, err := resolveUDPAddr("udp", ss.addr)
 	if err != nil {
-		return nil, nil, err
-	}
-
-	targetAddr := socks5.ParseAddr(metadata.RemoteAddress())
-	if targetAddr == nil {
-		return nil, nil, fmt.Errorf("parse address %s error: %s", metadata.String(), metadata.DstPort)
+		return nil, err
 	}
 
 	pc = ss.cipher.PacketConn(pc)
-	return newPacketConn(&ssUDPConn{PacketConn: pc, rAddr: targetAddr}, ss), addr, nil
+	return newPacketConn(&ssPacketConn{PacketConn: pc, rAddr: addr}, ss), nil
 }
 
 func (ss *ShadowSocks) MarshalJSON() ([]byte, error) {
@@ -109,12 +110,12 @@ func (ss *ShadowSocks) MarshalJSON() ([]byte, error) {
 }
 
 func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
-	server := net.JoinHostPort(option.Server, strconv.Itoa(option.Port))
+	addr := net.JoinHostPort(option.Server, strconv.Itoa(option.Port))
 	cipher := option.Cipher
 	password := option.Password
 	ciph, err := core.PickCipher(cipher, nil, password)
 	if err != nil {
-		return nil, fmt.Errorf("ss %s initialize error: %w", server, err)
+		return nil, fmt.Errorf("ss %s initialize error: %w", addr, err)
 	}
 
 	var v2rayOption *v2rayObfs.Option
@@ -136,49 +137,45 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
 	if option.Plugin == "obfs" {
 		opts := simpleObfsOption{Host: "bing.com"}
 		if err := decoder.Decode(option.PluginOpts, &opts); err != nil {
-			return nil, fmt.Errorf("ss %s initialize obfs error: %w", server, err)
+			return nil, fmt.Errorf("ss %s initialize obfs error: %w", addr, err)
 		}
 
 		if opts.Mode != "tls" && opts.Mode != "http" {
-			return nil, fmt.Errorf("ss %s obfs mode error: %s", server, opts.Mode)
+			return nil, fmt.Errorf("ss %s obfs mode error: %s", addr, opts.Mode)
 		}
 		obfsMode = opts.Mode
 		obfsOption = &opts
 	} else if option.Plugin == "v2ray-plugin" {
 		opts := v2rayObfsOption{Host: "bing.com", Mux: true}
 		if err := decoder.Decode(option.PluginOpts, &opts); err != nil {
-			return nil, fmt.Errorf("ss %s initialize v2ray-plugin error: %w", server, err)
+			return nil, fmt.Errorf("ss %s initialize v2ray-plugin error: %w", addr, err)
 		}
 
 		if opts.Mode != "websocket" {
-			return nil, fmt.Errorf("ss %s obfs mode error: %s", server, opts.Mode)
+			return nil, fmt.Errorf("ss %s obfs mode error: %s", addr, opts.Mode)
 		}
 		obfsMode = opts.Mode
-
-		var tlsConfig *tls.Config
-		if opts.TLS {
-			tlsConfig = &tls.Config{
-				ServerName:         opts.Host,
-				InsecureSkipVerify: opts.SkipCertVerify,
-				ClientSessionCache: getClientSessionCache(),
-			}
-		}
 		v2rayOption = &v2rayObfs.Option{
-			Host:      opts.Host,
-			Path:      opts.Path,
-			Headers:   opts.Headers,
-			TLSConfig: tlsConfig,
-			Mux:       opts.Mux,
+			Host:    opts.Host,
+			Path:    opts.Path,
+			Headers: opts.Headers,
+			Mux:     opts.Mux,
+		}
+
+		if opts.TLS {
+			v2rayOption.TLS = true
+			v2rayOption.SkipCertVerify = opts.SkipCertVerify
+			v2rayOption.SessionCache = getClientSessionCache()
 		}
 	}
 
 	return &ShadowSocks{
 		Base: &Base{
 			name: option.Name,
+			addr: addr,
 			tp:   C.Shadowsocks,
 			udp:  option.UDP,
 		},
-		server: server,
 		cipher: ciph,
 
 		obfsMode:    obfsMode,
@@ -187,27 +184,43 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
 	}, nil
 }
 
-type ssUDPConn struct {
+type ssPacketConn struct {
 	net.PacketConn
-	rAddr socks5.Addr
+	rAddr net.Addr
 }
 
-func (uc *ssUDPConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
-	packet, err := socks5.EncodeUDPPacket(uc.rAddr, b)
+func (spc *ssPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
 	if err != nil {
 		return
 	}
-	return uc.PacketConn.WriteTo(packet[3:], addr)
+	return spc.PacketConn.WriteTo(packet[3:], spc.rAddr)
 }
 
-func (uc *ssUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
-	n, _, e := uc.PacketConn.ReadFrom(b)
-	addr := socks5.SplitAddr(b[:n])
-	var from net.Addr
-	if e == nil {
-		// Get the source IP/Port of packet.
-		from = addr.UDPAddr()
+func (spc *ssPacketConn) WriteWithMetadata(p []byte, metadata *C.Metadata) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(socks5.ParseAddr(metadata.RemoteAddress()), p)
+	if err != nil {
+		return
 	}
-	copy(b, b[len(addr):])
-	return n - len(addr), from, e
+	return spc.PacketConn.WriteTo(packet[3:], spc.rAddr)
+}
+
+func (spc *ssPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, _, e := spc.PacketConn.ReadFrom(b)
+	if e != nil {
+		return 0, nil, e
+	}
+
+	addr := socks5.SplitAddr(b[:n])
+	if addr == nil {
+		return 0, nil, errors.New("parse addr error")
+	}
+
+	udpAddr := addr.UDPAddr()
+	if udpAddr == nil {
+		return 0, nil, errors.New("parse addr error")
+	}
+
+	copy(b, b[len(addr):])
+	return n - len(addr), udpAddr, e
 }

adapters/outbound/snell.go

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

adapters/outbound/socks5.go

@@ -3,19 +3,20 @@ package outbound
 import (
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"io"
 	"io/ioutil"
 	"net"
 	"strconv"
 
+	"github.com/Dreamacro/clash/component/dialer"
 	"github.com/Dreamacro/clash/component/socks5"
 	C "github.com/Dreamacro/clash/constant"
 )
 
 type Socks5 struct {
 	*Base
-	addr           string
 	user           string
 	pass           string
 	tls            bool
@@ -34,19 +35,16 @@ type Socks5Option struct {
 	SkipCertVerify bool   `proxy:"skip-cert-verify,omitempty"`
 }
 
-func (ss *Socks5) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := dialContext(ctx, "tcp", ss.addr)
-
-	if err == nil && ss.tls {
+func (ss *Socks5) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
+	if ss.tls {
 		cc := tls.Client(c, ss.tlsConfig)
-		err = cc.Handshake()
+		err := cc.Handshake()
 		c = cc
+		if err != nil {
+			return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
+		}
 	}
 
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
-	}
-	tcpKeepAlive(c)
 	var user *socks5.User
 	if ss.user != "" {
 		user = &socks5.User{
@@ -57,13 +55,28 @@ func (ss *Socks5) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn
 	if _, err := socks5.ClientHandshake(c, serializesSocksAddr(metadata), socks5.CmdConnect, user); err != nil {
 		return nil, err
 	}
-	return newConn(c, ss), nil
+	return c, nil
 }
 
-func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, _ net.Addr, err error) {
+func (ss *Socks5) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	c, err := dialer.DialContext(ctx, "tcp", ss.addr)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error: %w", ss.addr, err)
+	}
+	tcpKeepAlive(c)
+
+	c, err = ss.StreamConn(c, metadata)
+	if err != nil {
+		return nil, err
+	}
+
+	return NewConn(c, ss), nil
+}
+
+func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, err error) {
 	ctx, cancel := context.WithTimeout(context.Background(), tcpTimeout)
 	defer cancel()
-	c, err := dialContext(ctx, "tcp", ss.addr)
+	c, err := dialer.DialContext(ctx, "tcp", ss.addr)
 	if err != nil {
 		err = fmt.Errorf("%s connect error: %w", ss.addr, err)
 		return
@@ -96,17 +109,7 @@ func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, _ net.Addr, err
 		return
 	}
 
-	addr, err := net.ResolveUDPAddr("udp", bindAddr.String())
-	if err != nil {
-		return
-	}
-
-	targetAddr := socks5.ParseAddr(metadata.RemoteAddress())
-	if targetAddr == nil {
-		return nil, nil, fmt.Errorf("parse address %s error: %s", metadata.String(), metadata.DstPort)
-	}
-
-	pc, err := net.ListenPacket("udp", "")
+	pc, err := dialer.ListenPacket("udp", "")
 	if err != nil {
 		return
 	}
@@ -119,7 +122,7 @@ func (ss *Socks5) DialUDP(metadata *C.Metadata) (_ C.PacketConn, _ net.Addr, err
 		pc.Close()
 	}()
 
-	return newPacketConn(&socksUDPConn{PacketConn: pc, rAddr: targetAddr, tcpConn: c}, ss), addr, nil
+	return newPacketConn(&socksPacketConn{PacketConn: pc, rAddr: bindAddr.UDPAddr(), tcpConn: c}, ss), nil
 }
 
 func NewSocks5(option Socks5Option) *Socks5 {
@@ -135,10 +138,10 @@ func NewSocks5(option Socks5Option) *Socks5 {
 	return &Socks5{
 		Base: &Base{
 			name: option.Name,
+			addr: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 			tp:   C.Socks5,
 			udp:  option.UDP,
 		},
-		addr:           net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 		user:           option.UserName,
 		pass:           option.Password,
 		tls:            option.TLS,
@@ -147,22 +150,30 @@ func NewSocks5(option Socks5Option) *Socks5 {
 	}
 }
 
-type socksUDPConn struct {
+type socksPacketConn struct {
 	net.PacketConn
-	rAddr   socks5.Addr
+	rAddr   net.Addr
 	tcpConn net.Conn
 }
 
-func (uc *socksUDPConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
-	packet, err := socks5.EncodeUDPPacket(uc.rAddr, b)
+func (uc *socksPacketConn) WriteTo(b []byte, addr net.Addr) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
 	if err != nil {
 		return
 	}
-	return uc.PacketConn.WriteTo(packet, addr)
+	return uc.PacketConn.WriteTo(packet, uc.rAddr)
 }
 
-func (uc *socksUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
-	n, a, e := uc.PacketConn.ReadFrom(b)
+func (uc *socksPacketConn) WriteWithMetadata(p []byte, metadata *C.Metadata) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(socks5.ParseAddr(metadata.RemoteAddress()), p)
+	if err != nil {
+		return
+	}
+	return uc.PacketConn.WriteTo(packet, uc.rAddr)
+}
+
+func (uc *socksPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, _, e := uc.PacketConn.ReadFrom(b)
 	if e != nil {
 		return 0, nil, e
 	}
@@ -170,13 +181,18 @@ func (uc *socksUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
 	if err != nil {
 		return 0, nil, err
 	}
+
+	udpAddr := addr.UDPAddr()
+	if udpAddr == nil {
+		return 0, nil, errors.New("parse udp addr error")
+	}
+
 	// due to DecodeUDPPacket is mutable, record addr length
-	addrLength := len(addr)
 	copy(b, payload)
-	return n - addrLength - 3, a, nil
+	return n - len(addr) - 3, udpAddr, nil
 }
 
-func (uc *socksUDPConn) Close() error {
+func (uc *socksPacketConn) Close() error {
 	uc.tcpConn.Close()
 	return uc.PacketConn.Close()
 }

adapters/outbound/trojan.go

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

adapters/outbound/util.go

@@ -2,7 +2,6 @@ package outbound
 
 import (
 	"bytes"
-	"context"
 	"crypto/tls"
 	"fmt"
 	"net"
@@ -11,9 +10,9 @@ import (
 	"sync"
 	"time"
 
+	"github.com/Dreamacro/clash/component/resolver"
 	"github.com/Dreamacro/clash/component/socks5"
 	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/clash/dns"
 )
 
 const (
@@ -87,92 +86,13 @@ func serializesSocksAddr(metadata *C.Metadata) []byte {
 	return bytes.Join(buf, nil)
 }
 
-func dialContext(ctx context.Context, network, address string) (net.Conn, error) {
-	host, port, err := net.SplitHostPort(address)
-	if err != nil {
-		return nil, err
-	}
-
-	returned := make(chan struct{})
-	defer close(returned)
-
-	type dialResult struct {
-		net.Conn
-		error
-		resolved bool
-		ipv6     bool
-		done     bool
-	}
-	results := make(chan dialResult)
-	var primary, fallback dialResult
-
-	startRacer := func(ctx context.Context, host string, ipv6 bool) {
-		dialer := net.Dialer{}
-		result := dialResult{ipv6: ipv6, done: true}
-		defer func() {
-			select {
-			case results <- result:
-			case <-returned:
-				if result.Conn != nil {
-					result.Conn.Close()
-				}
-			}
-		}()
-
-		var ip net.IP
-		if ipv6 {
-			ip, result.error = dns.ResolveIPv6(host)
-		} else {
-			ip, result.error = dns.ResolveIPv4(host)
-		}
-		if result.error != nil {
-			return
-		}
-		result.resolved = true
-
-		if ipv6 {
-			result.Conn, result.error = dialer.DialContext(ctx, "tcp6", net.JoinHostPort(ip.String(), port))
-		} else {
-			result.Conn, result.error = dialer.DialContext(ctx, "tcp4", net.JoinHostPort(ip.String(), port))
-		}
-	}
-
-	go startRacer(ctx, host, false)
-	go startRacer(ctx, host, true)
-
-	for {
-		select {
-		case res := <-results:
-			if res.error == nil {
-				return res.Conn, nil
-			}
-
-			if !res.ipv6 {
-				primary = res
-			} else {
-				fallback = res
-			}
-
-			if primary.done && fallback.done {
-				if primary.resolved {
-					return nil, primary.error
-				} else if fallback.resolved {
-					return nil, fallback.error
-				} else {
-					return nil, primary.error
-				}
-			}
-		}
-	}
-}
-
 func resolveUDPAddr(network, address string) (*net.UDPAddr, error) {
 	host, port, err := net.SplitHostPort(address)
 	if err != nil {
 		return nil, err
 	}
 
-	ip, err := dns.ResolveIP(host)
+	ip, err := resolver.ResolveIP(host)
 	if err != nil {
 		return nil, err
 	}

adapters/outbound/vmess.go

@@ -2,19 +2,23 @@ package outbound
 
 import (
 	"context"
+	"errors"
 	"fmt"
 	"net"
+	"net/http"
 	"strconv"
 	"strings"
 
+	"github.com/Dreamacro/clash/component/dialer"
+	"github.com/Dreamacro/clash/component/resolver"
 	"github.com/Dreamacro/clash/component/vmess"
 	C "github.com/Dreamacro/clash/constant"
 )
 
 type Vmess struct {
 	*Base
-	server string
 	client *vmess.Client
+	option *VmessOption
 }
 
 type VmessOption struct {
@@ -27,50 +31,116 @@ type VmessOption struct {
 	TLS            bool              `proxy:"tls,omitempty"`
 	UDP            bool              `proxy:"udp,omitempty"`
 	Network        string            `proxy:"network,omitempty"`
+	HTTPOpts       HTTPOptions       `proxy:"http-opts,omitempty"`
 	WSPath         string            `proxy:"ws-path,omitempty"`
 	WSHeaders      map[string]string `proxy:"ws-headers,omitempty"`
 	SkipCertVerify bool              `proxy:"skip-cert-verify,omitempty"`
 }
 
-func (v *Vmess) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := dialContext(ctx, "tcp", v.server)
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error", v.server)
-	}
-	tcpKeepAlive(c)
-	c, err = v.client.New(c, parseVmessAddr(metadata))
-	return newConn(c, v), err
+type HTTPOptions struct {
+	Method  string              `proxy:"method,omitempty"`
+	Path    []string            `proxy:"path,omitempty"`
+	Headers map[string][]string `proxy:"headers,omitempty"`
 }
 
-func (v *Vmess) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	ctx, cancel := context.WithTimeout(context.Background(), tcpTimeout)
-	defer cancel()
-	c, err := dialContext(ctx, "tcp", v.server)
+func (v *Vmess) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
+	var err error
+	switch v.option.Network {
+	case "ws":
+		host, port, _ := net.SplitHostPort(v.addr)
+		wsOpts := &vmess.WebsocketConfig{
+			Host: host,
+			Port: port,
+			Path: v.option.WSPath,
+		}
+
+		if len(v.option.WSHeaders) != 0 {
+			header := http.Header{}
+			for key, value := range v.option.WSHeaders {
+				header.Add(key, value)
+			}
+			wsOpts.Headers = header
+		}
+
+		if v.option.TLS {
+			wsOpts.TLS = true
+			wsOpts.SessionCache = getClientSessionCache()
+			wsOpts.SkipCertVerify = v.option.SkipCertVerify
+		}
+		c, err = vmess.StreamWebsocketConn(c, wsOpts)
+	case "http":
+		host, _, _ := net.SplitHostPort(v.addr)
+		httpOpts := &vmess.HTTPConfig{
+			Host:    host,
+			Method:  v.option.HTTPOpts.Method,
+			Path:    v.option.HTTPOpts.Path,
+			Headers: v.option.HTTPOpts.Headers,
+		}
+
+		c = vmess.StreamHTTPConn(c, httpOpts)
+	default:
+		// handle TLS
+		if v.option.TLS {
+			host, _, _ := net.SplitHostPort(v.addr)
+			tlsOpts := &vmess.TLSConfig{
+				Host:           host,
+				SkipCertVerify: v.option.SkipCertVerify,
+				SessionCache:   getClientSessionCache(),
+			}
+			c, err = vmess.StreamTLSConn(c, tlsOpts)
+		}
+	}
+
 	if err != nil {
-		return nil, nil, fmt.Errorf("%s connect error", v.server)
+		return nil, err
+	}
+
+	return v.client.StreamConn(c, parseVmessAddr(metadata))
+}
+
+func (v *Vmess) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+	c, err := dialer.DialContext(ctx, "tcp", v.addr)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error", v.addr)
 	}
 	tcpKeepAlive(c)
-	c, err = v.client.New(c, parseVmessAddr(metadata))
-	if err != nil {
-		return nil, nil, fmt.Errorf("new vmess client error: %v", err)
+
+	c, err = v.StreamConn(c, metadata)
+	return NewConn(c, v), err
+}
+
+func (v *Vmess) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	// vmess use stream-oriented udp, so clash needs a net.UDPAddr
+	if !metadata.Resolved() {
+		ip, err := resolver.ResolveIP(metadata.Host)
+		if err != nil {
+			return nil, errors.New("can't resolve ip")
+		}
+		metadata.DstIP = ip
 	}
-	return newPacketConn(&vmessUDPConn{Conn: c}, v), c.RemoteAddr(), nil
+
+	ctx, cancel := context.WithTimeout(context.Background(), tcpTimeout)
+	defer cancel()
+	c, err := dialer.DialContext(ctx, "tcp", v.addr)
+	if err != nil {
+		return nil, fmt.Errorf("%s connect error", v.addr)
+	}
+	tcpKeepAlive(c)
+	c, err = v.StreamConn(c, metadata)
+	if err != nil {
+		return nil, fmt.Errorf("new vmess client error: %v", err)
+	}
+	return newPacketConn(&vmessPacketConn{Conn: c, rAddr: metadata.UDPAddr()}, v), nil
 }
 
 func NewVmess(option VmessOption) (*Vmess, error) {
 	security := strings.ToLower(option.Cipher)
 	client, err := vmess.NewClient(vmess.Config{
-		UUID:             option.UUID,
-		AlterID:          uint16(option.AlterID),
-		Security:         security,
-		TLS:              option.TLS,
-		HostName:         option.Server,
-		Port:             strconv.Itoa(option.Port),
-		NetWork:          option.Network,
-		WebSocketPath:    option.WSPath,
-		WebSocketHeaders: option.WSHeaders,
-		SkipCertVerify:   option.SkipCertVerify,
-		SessionCache:     getClientSessionCache(),
+		UUID:     option.UUID,
+		AlterID:  uint16(option.AlterID),
+		Security: security,
+		HostName: option.Server,
+		Port:     strconv.Itoa(option.Port),
 	})
 	if err != nil {
 		return nil, err
@@ -79,11 +149,12 @@ func NewVmess(option VmessOption) (*Vmess, error) {
 	return &Vmess{
 		Base: &Base{
 			name: option.Name,
+			addr: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 			tp:   C.Vmess,
 			udp:  true,
 		},
-		server: net.JoinHostPort(option.Server, strconv.Itoa(option.Port)),
 		client: client,
+		option: &option,
 	}, nil
 }
 
@@ -115,15 +186,20 @@ func parseVmessAddr(metadata *C.Metadata) *vmess.DstAddr {
 	}
 }
 
-type vmessUDPConn struct {
+type vmessPacketConn struct {
 	net.Conn
+	rAddr net.Addr
 }
 
-func (uc *vmessUDPConn) WriteTo(b []byte, addr net.Addr) (int, error) {
+func (uc *vmessPacketConn) WriteTo(b []byte, addr net.Addr) (int, error) {
 	return uc.Conn.Write(b)
 }
 
-func (uc *vmessUDPConn) ReadFrom(b []byte) (int, net.Addr, error) {
-	n, err := uc.Conn.Read(b)
-	return n, uc.RemoteAddr(), err
+func (uc *vmessPacketConn) WriteWithMetadata(p []byte, metadata *C.Metadata) (n int, err error) {
+	return uc.Conn.Write(p)
+}
+
+func (uc *vmessPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
+	n, err := uc.Conn.Read(b)
+	return n, uc.rAddr, err
 }

adapters/outboundgroup/fallback.go

@@ -3,7 +3,6 @@ package outboundgroup
 import (
 	"context"
 	"encoding/json"
-	"net"
 
 	"github.com/Dreamacro/clash/adapters/outbound"
 	"github.com/Dreamacro/clash/adapters/provider"
@@ -31,13 +30,13 @@ func (f *Fallback) DialContext(ctx context.Context, metadata *C.Metadata) (C.Con
 	return c, err
 }
 
-func (f *Fallback) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
+func (f *Fallback) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
 	proxy := f.findAliveProxy()
-	pc, addr, err := proxy.DialUDP(metadata)
+	pc, err := proxy.DialUDP(metadata)
 	if err == nil {
 		pc.AppendToChains(f)
 	}
-	return pc, addr, err
+	return pc, err
 }
 
 func (f *Fallback) SupportUDP() bool {
@@ -57,6 +56,11 @@ func (f *Fallback) MarshalJSON() ([]byte, error) {
 	})
 }
 
+func (f *Fallback) Unwrap(metadata *C.Metadata) C.Proxy {
+	proxy := f.findAliveProxy()
+	return proxy
+}
+
 func (f *Fallback) proxies() []C.Proxy {
 	elm, _, _ := f.single.Do(func() (interface{}, error) {
 		return getProvidersProxies(f.providers), nil
@@ -78,7 +82,7 @@ func (f *Fallback) findAliveProxy() C.Proxy {
 
 func NewFallback(name string, providers []provider.ProxyProvider) *Fallback {
 	return &Fallback{
-		Base:      outbound.NewBase(name, C.Fallback, false),
+		Base:      outbound.NewBase(name, "", C.Fallback, false),
 		single:    singledo.NewSingle(defaultGetProxiesDuration),
 		providers: providers,
 	}

adapters/outboundgroup/loadbalance.go

@@ -59,28 +59,29 @@ func (lb *LoadBalance) DialContext(ctx context.Context, metadata *C.Metadata) (c
 		}
 	}()
 
-	key := uint64(murmur3.Sum32([]byte(getKey(metadata))))
-	proxies := lb.proxies()
-	buckets := int32(len(proxies))
-	for i := 0; i < lb.maxRetry; i, key = i+1, key+1 {
-		idx := jumpHash(key, buckets)
-		proxy := proxies[idx]
-		if proxy.Alive() {
-			c, err = proxy.DialContext(ctx, metadata)
-			return
-		}
-	}
-	c, err = proxies[0].DialContext(ctx, metadata)
+	proxy := lb.Unwrap(metadata)
+
+	c, err = proxy.DialContext(ctx, metadata)
 	return
 }
 
-func (lb *LoadBalance) DialUDP(metadata *C.Metadata) (pc C.PacketConn, addr net.Addr, err error) {
+func (lb *LoadBalance) DialUDP(metadata *C.Metadata) (pc C.PacketConn, err error) {
 	defer func() {
 		if err == nil {
 			pc.AppendToChains(lb)
 		}
 	}()
 
+	proxy := lb.Unwrap(metadata)
+
+	return proxy.DialUDP(metadata)
+}
+
+func (lb *LoadBalance) SupportUDP() bool {
+	return true
+}
+
+func (lb *LoadBalance) Unwrap(metadata *C.Metadata) C.Proxy {
 	key := uint64(murmur3.Sum32([]byte(getKey(metadata))))
 	proxies := lb.proxies()
 	buckets := int32(len(proxies))
@@ -88,15 +89,11 @@ func (lb *LoadBalance) DialUDP(metadata *C.Metadata) (pc C.PacketConn, addr net.
 		idx := jumpHash(key, buckets)
 		proxy := proxies[idx]
 		if proxy.Alive() {
-			return proxy.DialUDP(metadata)
+			return proxy
 		}
 	}
 
-	return proxies[0].DialUDP(metadata)
-}
-
-func (lb *LoadBalance) SupportUDP() bool {
-	return true
+	return proxies[0]
 }
 
 func (lb *LoadBalance) proxies() []C.Proxy {
@@ -120,7 +117,7 @@ func (lb *LoadBalance) MarshalJSON() ([]byte, error) {
 
 func NewLoadBalance(name string, providers []provider.ProxyProvider) *LoadBalance {
 	return &LoadBalance{
-		Base:      outbound.NewBase(name, C.LoadBalance, false),
+		Base:      outbound.NewBase(name, "", C.LoadBalance, false),
 		single:    singledo.NewSingle(defaultGetProxiesDuration),
 		maxRetry:  3,
 		providers: providers,

adapters/outboundgroup/parser.go

@@ -56,7 +56,7 @@ func ParseProxyGroup(config map[string]interface{}, proxyMap map[string]C.Proxy,
 		// if Use not empty, drop health check options
 		if len(groupOption.Use) != 0 {
 			hc := provider.NewHealthCheck(ps, "", 0)
-			pd, err := provider.NewCompatibleProvier(groupName, ps, hc)
+			pd, err := provider.NewCompatibleProvider(groupName, ps, hc)
 			if err != nil {
 				return nil, err
 			}
@@ -64,9 +64,9 @@ func ParseProxyGroup(config map[string]interface{}, proxyMap map[string]C.Proxy,
 			providers = append(providers, pd)
 		} else {
 			// select don't need health check
-			if groupOption.Type == "select" {
+			if groupOption.Type == "select" || groupOption.Type == "relay" {
 				hc := provider.NewHealthCheck(ps, "", 0)
-				pd, err := provider.NewCompatibleProvier(groupName, ps, hc)
+				pd, err := provider.NewCompatibleProvider(groupName, ps, hc)
 				if err != nil {
 					return nil, err
 				}
@@ -79,7 +79,7 @@ func ParseProxyGroup(config map[string]interface{}, proxyMap map[string]C.Proxy,
 				}
 
 				hc := provider.NewHealthCheck(ps, groupOption.URL, uint(groupOption.Interval))
-				pd, err := provider.NewCompatibleProvier(groupName, ps, hc)
+				pd, err := provider.NewCompatibleProvider(groupName, ps, hc)
 				if err != nil {
 					return nil, err
 				}
@@ -108,6 +108,8 @@ func ParseProxyGroup(config map[string]interface{}, proxyMap map[string]C.Proxy,
 		group = NewFallback(groupName, providers)
 	case "load-balance":
 		group = NewLoadBalance(groupName, providers)
+	case "relay":
+		group = NewRelay(groupName, providers)
 	default:
 		return nil, fmt.Errorf("%w: %s", errType, groupOption.Type)
 	}

adapters/outboundgroup/relay.go

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

adapters/outboundgroup/selector.go

@@ -4,7 +4,6 @@ import (
 	"context"
 	"encoding/json"
 	"errors"
-	"net"
 
 	"github.com/Dreamacro/clash/adapters/outbound"
 	"github.com/Dreamacro/clash/adapters/provider"
@@ -15,33 +14,33 @@ import (
 type Selector struct {
 	*outbound.Base
 	single    *singledo.Single
-	selected  C.Proxy
+	selected  string
 	providers []provider.ProxyProvider
 }
 
 func (s *Selector) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	c, err := s.selected.DialContext(ctx, metadata)
+	c, err := s.selectedProxy().DialContext(ctx, metadata)
 	if err == nil {
 		c.AppendToChains(s)
 	}
 	return c, err
 }
 
-func (s *Selector) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	pc, addr, err := s.selected.DialUDP(metadata)
+func (s *Selector) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	pc, err := s.selectedProxy().DialUDP(metadata)
 	if err == nil {
 		pc.AppendToChains(s)
 	}
-	return pc, addr, err
+	return pc, err
 }
 
 func (s *Selector) SupportUDP() bool {
-	return s.selected.SupportUDP()
+	return s.selectedProxy().SupportUDP()
 }
 
 func (s *Selector) MarshalJSON() ([]byte, error) {
 	var all []string
-	for _, proxy := range s.proxies() {
+	for _, proxy := range getProvidersProxies(s.providers) {
 		all = append(all, proxy.Name())
 	}
 
@@ -53,13 +52,14 @@ func (s *Selector) MarshalJSON() ([]byte, error) {
 }
 
 func (s *Selector) Now() string {
-	return s.selected.Name()
+	return s.selectedProxy().Name()
 }
 
 func (s *Selector) Set(name string) error {
-	for _, proxy := range s.proxies() {
+	for _, proxy := range getProvidersProxies(s.providers) {
 		if proxy.Name() == name {
-			s.selected = proxy
+			s.selected = name
+			s.single.Reset()
 			return nil
 		}
 	}
@@ -67,18 +67,29 @@ func (s *Selector) Set(name string) error {
 	return errors.New("Proxy does not exist")
 }
 
-func (s *Selector) proxies() []C.Proxy {
+func (s *Selector) Unwrap(metadata *C.Metadata) C.Proxy {
+	return s.selectedProxy()
+}
+
+func (s *Selector) selectedProxy() C.Proxy {
 	elm, _, _ := s.single.Do(func() (interface{}, error) {
-		return getProvidersProxies(s.providers), nil
+		proxies := getProvidersProxies(s.providers)
+		for _, proxy := range proxies {
+			if proxy.Name() == s.selected {
+				return proxy, nil
+			}
+		}
+
+		return proxies[0], nil
 	})
 
-	return elm.([]C.Proxy)
+	return elm.(C.Proxy)
 }
 
 func NewSelector(name string, providers []provider.ProxyProvider) *Selector {
-	selected := providers[0].Proxies()[0]
+	selected := providers[0].Proxies()[0].Name()
 	return &Selector{
-		Base:      outbound.NewBase(name, C.Selector, false),
+		Base:      outbound.NewBase(name, "", C.Selector, false),
 		single:    singledo.NewSingle(defaultGetProxiesDuration),
 		providers: providers,
 		selected:  selected,

adapters/outboundgroup/urltest.go

@@ -3,7 +3,6 @@ package outboundgroup
 import (
 	"context"
 	"encoding/json"
-	"net"
 	"time"
 
 	"github.com/Dreamacro/clash/adapters/outbound"
@@ -31,12 +30,16 @@ func (u *URLTest) DialContext(ctx context.Context, metadata *C.Metadata) (c C.Co
 	return c, err
 }
 
-func (u *URLTest) DialUDP(metadata *C.Metadata) (C.PacketConn, net.Addr, error) {
-	pc, addr, err := u.fast().DialUDP(metadata)
+func (u *URLTest) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
+	pc, err := u.fast().DialUDP(metadata)
 	if err == nil {
 		pc.AppendToChains(u)
 	}
-	return pc, addr, err
+	return pc, err
+}
+
+func (u *URLTest) Unwrap(metadata *C.Metadata) C.Proxy {
+	return u.fast()
 }
 
 func (u *URLTest) proxies() []C.Proxy {
@@ -87,7 +90,7 @@ func (u *URLTest) MarshalJSON() ([]byte, error) {
 
 func NewURLTest(name string, providers []provider.ProxyProvider) *URLTest {
 	return &URLTest{
-		Base:       outbound.NewBase(name, C.URLTest, false),
+		Base:       outbound.NewBase(name, "", C.URLTest, false),
 		single:     singledo.NewSingle(defaultGetProxiesDuration),
 		fastSingle: singledo.NewSingle(time.Second * 10),
 		providers:  providers,

adapters/outboundgroup/util.go

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

adapters/provider/fetcher.go

@@ -0,0 +1,154 @@
+package provider
+
+import (
+	"bytes"
+	"crypto/md5"
+	"io/ioutil"
+	"os"
+	"time"
+
+	"github.com/Dreamacro/clash/log"
+)
+
+var (
+	fileMode os.FileMode = 0666
+)
+
+type parser = func([]byte) (interface{}, error)
+
+type fetcher struct {
+	name      string
+	vehicle   Vehicle
+	updatedAt *time.Time
+	ticker    *time.Ticker
+	hash      [16]byte
+	parser    parser
+	onUpdate  func(interface{})
+}
+
+func (f *fetcher) Name() string {
+	return f.name
+}
+
+func (f *fetcher) VehicleType() VehicleType {
+	return f.vehicle.Type()
+}
+
+func (f *fetcher) Initial() (interface{}, error) {
+	var buf []byte
+	var err error
+	var isLocal bool
+	if stat, err := os.Stat(f.vehicle.Path()); err == nil {
+		buf, err = ioutil.ReadFile(f.vehicle.Path())
+		modTime := stat.ModTime()
+		f.updatedAt = &modTime
+		isLocal = true
+	} else {
+		buf, err = f.vehicle.Read()
+	}
+
+	if err != nil {
+		return nil, err
+	}
+
+	proxies, err := f.parser(buf)
+	if err != nil {
+		if !isLocal {
+			return nil, err
+		}
+
+		// parse local file error, fallback to remote
+		buf, err = f.vehicle.Read()
+		if err != nil {
+			return nil, err
+		}
+
+		proxies, err = f.parser(buf)
+		if err != nil {
+			return nil, err
+		}
+	}
+
+	if err := ioutil.WriteFile(f.vehicle.Path(), buf, fileMode); err != nil {
+		return nil, err
+	}
+
+	f.hash = md5.Sum(buf)
+
+	// pull proxies automatically
+	if f.ticker != nil {
+		go f.pullLoop()
+	}
+
+	return proxies, nil
+}
+
+func (f *fetcher) Update() (interface{}, bool, error) {
+	buf, err := f.vehicle.Read()
+	if err != nil {
+		return nil, false, err
+	}
+
+	now := time.Now()
+	hash := md5.Sum(buf)
+	if bytes.Equal(f.hash[:], hash[:]) {
+		f.updatedAt = &now
+		return nil, true, nil
+	}
+
+	proxies, err := f.parser(buf)
+	if err != nil {
+		return nil, false, err
+	}
+
+	if err := ioutil.WriteFile(f.vehicle.Path(), buf, fileMode); err != nil {
+		return nil, false, err
+	}
+
+	f.updatedAt = &now
+	f.hash = hash
+
+	return proxies, false, nil
+}
+
+func (f *fetcher) Destroy() error {
+	if f.ticker != nil {
+		f.ticker.Stop()
+	}
+	return nil
+}
+
+func (f *fetcher) pullLoop() {
+	for range f.ticker.C {
+		elm, same, err := f.Update()
+		if err != nil {
+			log.Warnln("[Provider] %s pull error: %s", f.Name(), err.Error())
+			continue
+		}
+
+		if same {
+			log.Debugln("[Provider] %s's proxies doesn't change", f.Name())
+			continue
+		}
+
+		log.Infoln("[Provider] %s's proxies update", f.Name())
+		if f.onUpdate != nil {
+			f.onUpdate(elm)
+		}
+	}
+}
+
+func newFetcher(name string, interval time.Duration, vehicle Vehicle, parser parser, onUpdate func(interface{})) *fetcher {
+	var ticker *time.Ticker
+	if interval != 0 {
+		ticker = time.NewTicker(interval)
+	}
+
+	return &fetcher{
+		name:     name,
+		ticker:   ticker,
+		vehicle:  vehicle,
+		parser:   parser,
+		onUpdate: onUpdate,
+	}
+}

adapters/provider/parser.go

@@ -41,7 +41,7 @@ func ParseProxyProvider(name string, mapping map[string]interface{}) (ProxyProvi
 	}
 	hc := NewHealthCheck([]C.Proxy{}, schema.HealthCheck.URL, hcInterval)
 
-	path := C.Path.Reslove(schema.Path)
+	path := C.Path.Resolve(schema.Path)
 
 	var vehicle Vehicle
 	switch schema.Type {

adapters/provider/provider.go

@@ -1,26 +1,20 @@
 package provider
 
 import (
-	"bytes"
-	"crypto/md5"
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
-	"os"
+	"runtime"
 	"time"
 
 	"github.com/Dreamacro/clash/adapters/outbound"
 	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/clash/log"
 
 	"gopkg.in/yaml.v2"
 )
 
 const (
 	ReservedName = "default"
-
-	fileMode = 0666
 )
 
 // Provider Type
@@ -49,8 +43,7 @@ type Provider interface {
 	VehicleType() VehicleType
 	Type() ProviderType
 	Initial() error
-	Reload() error
-	Destroy() error
+	Update() error
 }
 
 // ProxyProvider interface
@@ -58,24 +51,24 @@ type ProxyProvider interface {
 	Provider
 	Proxies() []C.Proxy
 	HealthCheck()
-	Update() error
 }
 
 type ProxySchema struct {
 	Proxies []map[string]interface{} `yaml:"proxies"`
 }
 
+// for auto gc
 type ProxySetProvider struct {
-	name        string
-	vehicle     Vehicle
-	hash        [16]byte
-	proxies     []C.Proxy
-	healthCheck *HealthCheck
-	ticker      *time.Ticker
-	updatedAt   *time.Time
+	*proxySetProvider
 }
 
-func (pp *ProxySetProvider) MarshalJSON() ([]byte, error) {
+type proxySetProvider struct {
+	*fetcher
+	proxies     []C.Proxy
+	healthCheck *HealthCheck
+}
+
+func (pp *proxySetProvider) MarshalJSON() ([]byte, error) {
 	return json.Marshal(map[string]interface{}{
 		"name":        pp.Name(),
 		"type":        pp.Type().String(),
@@ -85,119 +78,41 @@ func (pp *ProxySetProvider) MarshalJSON() ([]byte, error) {
 	})
 }
 
-func (pp *ProxySetProvider) Name() string {
+func (pp *proxySetProvider) Name() string {
 	return pp.name
 }
 
-func (pp *ProxySetProvider) Reload() error {
-	return nil
-}
-
-func (pp *ProxySetProvider) HealthCheck() {
+func (pp *proxySetProvider) HealthCheck() {
 	pp.healthCheck.check()
 }
 
-func (pp *ProxySetProvider) Update() error {
-	return pp.pull()
+func (pp *proxySetProvider) Update() error {
+	elm, same, err := pp.fetcher.Update()
+	if err == nil && !same {
+		pp.onUpdate(elm)
+	}
+	return err
 }
 
-func (pp *ProxySetProvider) Destroy() error {
-	pp.healthCheck.close()
-
-	if pp.ticker != nil {
-		pp.ticker.Stop()
-	}
-
-	return nil
-}
-
-func (pp *ProxySetProvider) Initial() error {
-	var buf []byte
-	var err error
-	if stat, err := os.Stat(pp.vehicle.Path()); err == nil {
-		buf, err = ioutil.ReadFile(pp.vehicle.Path())
-		modTime := stat.ModTime()
-		pp.updatedAt = &modTime
-	} else {
-		buf, err = pp.vehicle.Read()
-	}
-
+func (pp *proxySetProvider) Initial() error {
+	elm, err := pp.fetcher.Initial()
 	if err != nil {
 		return err
 	}
 
-	proxies, err := pp.parse(buf)
-	if err != nil {
-		return err
-	}
-
-	if err := ioutil.WriteFile(pp.vehicle.Path(), buf, fileMode); err != nil {
-		return err
-	}
-
-	pp.hash = md5.Sum(buf)
-	pp.setProxies(proxies)
-
-	// pull proxies automatically
-	if pp.ticker != nil {
-		go pp.pullLoop()
-	}
-
+	pp.onUpdate(elm)
 	return nil
 }
 
-func (pp *ProxySetProvider) VehicleType() VehicleType {
-	return pp.vehicle.Type()
-}
-
-func (pp *ProxySetProvider) Type() ProviderType {
+func (pp *proxySetProvider) Type() ProviderType {
 	return Proxy
 }
 
-func (pp *ProxySetProvider) Proxies() []C.Proxy {
+func (pp *proxySetProvider) Proxies() []C.Proxy {
 	return pp.proxies
 }
 
-func (pp *ProxySetProvider) pullLoop() {
-	for range pp.ticker.C {
-		if err := pp.pull(); err != nil {
-			log.Warnln("[Provider] %s pull error: %s", pp.Name(), err.Error())
-		}
-	}
-}
-
-func (pp *ProxySetProvider) pull() error {
-	buf, err := pp.vehicle.Read()
-	if err != nil {
-		return err
-	}
-
-	now := time.Now()
-	hash := md5.Sum(buf)
-	if bytes.Equal(pp.hash[:], hash[:]) {
-		log.Debugln("[Provider] %s's proxies doesn't change", pp.Name())
-		pp.updatedAt = &now
-		return nil
-	}
-
-	proxies, err := pp.parse(buf)
-	if err != nil {
-		return err
-	}
-	log.Infoln("[Provider] %s's proxies update", pp.Name())
-
-	if err := ioutil.WriteFile(pp.vehicle.Path(), buf, fileMode); err != nil {
-		return err
-	}
-
-	pp.updatedAt = &now
-	pp.hash = hash
-	pp.setProxies(proxies)
-
-	return nil
-}
-
-func (pp *ProxySetProvider) parse(buf []byte) ([]C.Proxy, error) {
+func proxiesParse(buf []byte) (interface{}, error) {
 	schema := &ProxySchema{}
 
 	if err := yaml.Unmarshal(buf, schema); err != nil {
@@ -224,38 +139,52 @@ func (pp *ProxySetProvider) parse(buf []byte) ([]C.Proxy, error) {
 	return proxies, nil
 }
 
-func (pp *ProxySetProvider) setProxies(proxies []C.Proxy) {
+func (pp *proxySetProvider) setProxies(proxies []C.Proxy) {
 	pp.proxies = proxies
 	pp.healthCheck.setProxy(proxies)
 	go pp.healthCheck.check()
 }
 
-func NewProxySetProvider(name string, interval time.Duration, vehicle Vehicle, hc *HealthCheck) *ProxySetProvider {
-	var ticker *time.Ticker
-	if interval != 0 {
-		ticker = time.NewTicker(interval)
-	}
+func stopProxyProvider(pd *ProxySetProvider) {
+	pd.healthCheck.close()
+	pd.fetcher.Destroy()
+}
 
+func NewProxySetProvider(name string, interval time.Duration, vehicle Vehicle, hc *HealthCheck) *ProxySetProvider {
 	if hc.auto() {
 		go hc.process()
 	}
 
-	return &ProxySetProvider{
-		name:        name,
-		vehicle:     vehicle,
+	pd := &proxySetProvider{
 		proxies:     []C.Proxy{},
 		healthCheck: hc,
-		ticker:      ticker,
 	}
+
+	onUpdate := func(elm interface{}) {
+		ret := elm.([]C.Proxy)
+		pd.setProxies(ret)
+	}
+
+	fetcher := newFetcher(name, interval, vehicle, proxiesParse, onUpdate)
+	pd.fetcher = fetcher
+
+	wrapper := &ProxySetProvider{pd}
+	runtime.SetFinalizer(wrapper, stopProxyProvider)
+	return wrapper
 }
 
-type CompatibleProvier struct {
+// for auto gc
+type CompatibleProvider struct {
+	*compatibleProvider
+}
+
+type compatibleProvider struct {
 	name        string
 	healthCheck *HealthCheck
 	proxies     []C.Proxy
 }
 
-func (cp *CompatibleProvier) MarshalJSON() ([]byte, error) {
+func (cp *compatibleProvider) MarshalJSON() ([]byte, error) {
 	return json.Marshal(map[string]interface{}{
 		"name":        cp.Name(),
 		"type":        cp.Type().String(),
@@ -264,44 +193,39 @@ func (cp *CompatibleProvier) MarshalJSON() ([]byte, error) {
 	})
 }
 
-func (cp *CompatibleProvier) Name() string {
+func (cp *compatibleProvider) Name() string {
 	return cp.name
 }
 
-func (cp *CompatibleProvier) Reload() error {
-	return nil
-}
-
-func (cp *CompatibleProvier) Destroy() error {
-	cp.healthCheck.close()
-	return nil
-}
-
-func (cp *CompatibleProvier) HealthCheck() {
+func (cp *compatibleProvider) HealthCheck() {
 	cp.healthCheck.check()
 }
 
-func (cp *CompatibleProvier) Update() error {
+func (cp *compatibleProvider) Update() error {
 	return nil
 }
 
-func (cp *CompatibleProvier) Initial() error {
+func (cp *compatibleProvider) Initial() error {
 	return nil
 }
 
-func (cp *CompatibleProvier) VehicleType() VehicleType {
+func (cp *compatibleProvider) VehicleType() VehicleType {
 	return Compatible
 }
 
-func (cp *CompatibleProvier) Type() ProviderType {
+func (cp *compatibleProvider) Type() ProviderType {
 	return Proxy
 }
 
-func (cp *CompatibleProvier) Proxies() []C.Proxy {
+func (cp *compatibleProvider) Proxies() []C.Proxy {
 	return cp.proxies
 }
 
-func NewCompatibleProvier(name string, proxies []C.Proxy, hc *HealthCheck) (*CompatibleProvier, error) {
+func stopCompatibleProvider(pd *CompatibleProvider) {
+	pd.healthCheck.close()
+}
+
+func NewCompatibleProvider(name string, proxies []C.Proxy, hc *HealthCheck) (*CompatibleProvider, error) {
 	if len(proxies) == 0 {
 		return nil, errors.New("Provider need one proxy at least")
 	}
@@ -310,9 +234,13 @@ func NewCompatibleProvier(name string, proxies []C.Proxy, hc *HealthCheck) (*Com
 		go hc.process()
 	}
 
-	return &CompatibleProvier{
+	pd := &compatibleProvider{
 		name:        name,
 		proxies:     proxies,
 		healthCheck: hc,
-	}, nil
+	}
+
+	wrapper := &CompatibleProvider{pd}
+	runtime.SetFinalizer(wrapper, stopCompatibleProvider)
+	return wrapper, nil
 }

adapters/provider/vehicle.go

@@ -4,7 +4,10 @@ import (
 	"context"
 	"io/ioutil"
 	"net/http"
+	"net/url"
 	"time"
+
+	"github.com/Dreamacro/clash/component/dialer"
 )
 
 // Vehicle Type
@@ -73,10 +76,21 @@ func (h *HTTPVehicle) Read() ([]byte, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), time.Second*20)
 	defer cancel()
 
-	req, err := http.NewRequest(http.MethodGet, h.url, nil)
+	uri, err := url.Parse(h.url)
 	if err != nil {
 		return nil, err
 	}
+
+	req, err := http.NewRequest(http.MethodGet, uri.String(), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	if user := uri.User; user != nil {
+		password, _ := user.Password()
+		req.SetBasicAuth(user.Username(), password)
+	}
+
 	req = req.WithContext(ctx)
 
 	transport := &http.Transport{
@@ -85,6 +99,7 @@ func (h *HTTPVehicle) Read() ([]byte, error) {
 		IdleConnTimeout:       90 * time.Second,
 		TLSHandshakeTimeout:   10 * time.Second,
 		ExpectContinueTimeout: 1 * time.Second,
+		DialContext:           dialer.DialContext,
 	}
 
 	client := http.Client{Transport: transport}
@@ -92,15 +107,12 @@ func (h *HTTPVehicle) Read() ([]byte, error) {
 	if err != nil {
 		return nil, err
 	}
+
 	buf, err := ioutil.ReadAll(resp.Body)
 	if err != nil {
 		return nil, err
 	}
 
-	if err := ioutil.WriteFile(h.path, buf, fileMode); err != nil {
-		return nil, err
-	}
-
 	return buf, nil
 }
 

common/cache/lrucache.go

@@ -12,7 +12,7 @@ import (
 type Option func(*LruCache)
 
 // EvictCallback is used to get a callback when a cache entry is evicted
-type EvictCallback func(key interface{}, value interface{})
+type EvictCallback = func(key interface{}, value interface{})
 
 // WithEvict set the evict callback
 func WithEvict(cb EvictCallback) Option {
@@ -42,6 +42,14 @@ func WithSize(maxSize int) Option {
 	}
 }
 
+// WithStale decide whether Stale return is enabled.
+// If this feature is enabled, element will not get Evicted according to `WithAge`.
+func WithStale(stale bool) Option {
+	return func(l *LruCache) {
+		l.staleReturn = stale
+	}
+}
+
 // LruCache is a thread-safe, in-memory lru-cache that evicts the
 // least recently used entries from memory when (if set) the entries are
 // older than maxAge (in seconds).  Use the New constructor to create one.
@@ -52,6 +60,7 @@ type LruCache struct {
 	cache          map[interface{}]*list.Element
 	lru            *list.List // Front is least-recent
 	updateAgeOnGet bool
+	staleReturn    bool
 	onEvict        EvictCallback
 }
 
@@ -72,31 +81,28 @@ func NewLRUCache(options ...Option) *LruCache {
 // Get returns the interface{} representation of a cached response and a bool
 // set to true if the key was found.
 func (c *LruCache) Get(key interface{}) (interface{}, bool) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
-	le, ok := c.cache[key]
-	if !ok {
+	entry := c.get(key)
+	if entry == nil {
 		return nil, false
 	}
-
-	if c.maxAge > 0 && le.Value.(*entry).expires <= time.Now().Unix() {
-		c.deleteElement(le)
-		c.maybeDeleteOldest()
-
-		return nil, false
-	}
-
-	c.lru.MoveToBack(le)
-	entry := le.Value.(*entry)
-	if c.maxAge > 0 && c.updateAgeOnGet {
-		entry.expires = time.Now().Unix() + c.maxAge
-	}
 	value := entry.value
 
 	return value, true
 }
 
+// GetWithExpire returns the interface{} representation of a cached response,
+// a time.Time Give expected expires,
+// and a bool set to true if the key was found.
+// This method will NOT check the maxAge of element and will NOT update the expires.
+func (c *LruCache) GetWithExpire(key interface{}) (interface{}, time.Time, bool) {
+	entry := c.get(key)
+	if entry == nil {
+		return nil, time.Time{}, false
+	}
+
+	return entry.value, time.Unix(entry.expires, 0), true
+}
+
 // Exist returns if key exist in cache but not put item to the head of linked list
 func (c *LruCache) Exist(key interface{}) bool {
 	c.mu.Lock()
@@ -108,21 +114,26 @@ func (c *LruCache) Exist(key interface{}) bool {
 
 // Set stores the interface{} representation of a response for a given key.
 func (c *LruCache) Set(key interface{}, value interface{}) {
-	c.mu.Lock()
-	defer c.mu.Unlock()
-
 	expires := int64(0)
 	if c.maxAge > 0 {
 		expires = time.Now().Unix() + c.maxAge
 	}
+	c.SetWithExpire(key, value, time.Unix(expires, 0))
+}
+
+// SetWithExpire stores the interface{} representation of a response for a given key and given exires.
+// The expires time will round to second.
+func (c *LruCache) SetWithExpire(key interface{}, value interface{}, expires time.Time) {
+	c.mu.Lock()
+	defer c.mu.Unlock()
 
 	if le, ok := c.cache[key]; ok {
 		c.lru.MoveToBack(le)
 		e := le.Value.(*entry)
 		e.value = value
-		e.expires = expires
+		e.expires = expires.Unix()
 	} else {
-		e := &entry{key: key, value: value, expires: expires}
+		e := &entry{key: key, value: value, expires: expires.Unix()}
 		c.cache[key] = c.lru.PushBack(e)
 
 		if c.maxSize > 0 {
@@ -135,6 +146,30 @@ func (c *LruCache) Set(key interface{}, value interface{}) {
 	c.maybeDeleteOldest()
 }
 
+func (c *LruCache) get(key interface{}) *entry {
+	c.mu.Lock()
+	defer c.mu.Unlock()
+
+	le, ok := c.cache[key]
+	if !ok {
+		return nil
+	}
+
+	if !c.staleReturn && c.maxAge > 0 && le.Value.(*entry).expires <= time.Now().Unix() {
+		c.deleteElement(le)
+		c.maybeDeleteOldest()
+
+		return nil
+	}
+
+	c.lru.MoveToBack(le)
+	entry := le.Value.(*entry)
+	if c.maxAge > 0 && c.updateAgeOnGet {
+		entry.expires = time.Now().Unix() + c.maxAge
+	}
+	return entry
+}
+
 // Delete removes the value associated with a key.
 func (c *LruCache) Delete(key string) {
 	c.mu.Lock()
@@ -147,7 +182,7 @@ func (c *LruCache) Delete(key string) {
 }
 
 func (c *LruCache) maybeDeleteOldest() {
-	if c.maxAge > 0 {
+	if !c.staleReturn && c.maxAge > 0 {
 		now := time.Now().Unix()
 		for le := c.lru.Front(); le != nil && le.Value.(*entry).expires <= now; le = c.lru.Front() {
 			c.deleteElement(le)

common/cache/lrucache_test.go

@@ -136,3 +136,31 @@ func TestEvict(t *testing.T) {
 
 	assert.Equal(t, temp, 3)
 }
+
+func TestSetWithExpire(t *testing.T) {
+	c := NewLRUCache(WithAge(1))
+	now := time.Now().Unix()
+
+	tenSecBefore := time.Unix(now-10, 0)
+	c.SetWithExpire(1, 2, tenSecBefore)
+
+	// res is expected not to exist, and expires should be empty time.Time
+	res, expires, exist := c.GetWithExpire(1)
+	assert.Equal(t, nil, res)
+	assert.Equal(t, time.Time{}, expires)
+	assert.Equal(t, false, exist)
+
+}
+
+func TestStale(t *testing.T) {
+	c := NewLRUCache(WithAge(1), WithStale(true))
+	now := time.Now().Unix()
+
+	tenSecBefore := time.Unix(now-10, 0)
+	c.SetWithExpire(1, 2, tenSecBefore)
+
+	res, expires, exist := c.GetWithExpire(1)
+	assert.Equal(t, 2, res)
+	assert.Equal(t, tenSecBefore, expires)
+	assert.Equal(t, true, exist)
+}

common/picker/picker.go

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

common/picker/picker_test.go

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

common/pool/alloc.go

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

common/pool/alloc_test.go

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

common/pool/pool.go

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

common/singledo/singledo.go

@@ -50,6 +50,10 @@ func (s *Single) Do(fn func() (interface{}, error)) (v interface{}, err error, s
 	return call.val, call.err, false
 }
 
+func (s *Single) Reset() {
+	s.last = time.Time{}
+}
+
 func NewSingle(wait time.Duration) *Single {
 	return &Single{wait: wait}
 }

common/singledo/singledo_test.go

@@ -19,7 +19,7 @@ func TestBasic(t *testing.T) {
 	}
 
 	var wg sync.WaitGroup
-	const n = 10
+	const n = 5
 	wg.Add(n)
 	for i := 0; i < n; i++ {
 		go func() {
@@ -33,7 +33,7 @@ func TestBasic(t *testing.T) {
 
 	wg.Wait()
 	assert.Equal(t, 1, foo)
-	assert.Equal(t, 9, shardCount)
+	assert.Equal(t, 4, shardCount)
 }
 
 func TestTimer(t *testing.T) {
@@ -51,3 +51,18 @@ func TestTimer(t *testing.T) {
 	assert.Equal(t, 1, foo)
 	assert.True(t, shard)
 }
+
+func TestReset(t *testing.T) {
+	single := NewSingle(time.Millisecond * 30)
+	foo := 0
+	call := func() (interface{}, error) {
+		foo++
+		return nil, nil
+	}
+
+	single.Do(call)
+	single.Reset()
+	single.Do(call)
+
+	assert.Equal(t, 2, foo)
+}

common/sockopt/reuseaddr_linux.go

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

common/sockopt/reuseaddr_other.go

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

common/structure/structure.go

@@ -216,6 +216,11 @@ func (d *Decoder) decodeMapFromMap(name string, dataVal reflect.Value, val refle
 		}
 
 		v := dataVal.MapIndex(k).Interface()
+		if v == nil {
+			errors = append(errors, fmt.Sprintf("filed %s invalid", fieldName))
+			continue
+		}
+
 		currentVal := reflect.Indirect(reflect.New(valElemType))
 		if err := d.decode(fieldName, v, currentVal); err != nil {
 			errors = append(errors, err.Error())

component/dialer/dialer.go

@@ -0,0 +1,174 @@
+package dialer
+
+import (
+	"context"
+	"errors"
+	"net"
+
+	"github.com/Dreamacro/clash/component/resolver"
+)
+
+func Dialer() (*net.Dialer, error) {
+	dialer := &net.Dialer{}
+	if DialerHook != nil {
+		if err := DialerHook(dialer); err != nil {
+			return nil, err
+		}
+	}
+
+	return dialer, nil
+}
+
+func ListenConfig() (*net.ListenConfig, error) {
+	cfg := &net.ListenConfig{}
+	if ListenConfigHook != nil {
+		if err := ListenConfigHook(cfg); err != nil {
+			return nil, err
+		}
+	}
+
+	return cfg, nil
+}
+
+func Dial(network, address string) (net.Conn, error) {
+	return DialContext(context.Background(), network, address)
+}
+
+func DialContext(ctx context.Context, network, address string) (net.Conn, error) {
+	switch network {
+	case "tcp4", "tcp6", "udp4", "udp6":
+		host, port, err := net.SplitHostPort(address)
+		if err != nil {
+			return nil, err
+		}
+
+		dialer, err := Dialer()
+		if err != nil {
+			return nil, err
+		}
+
+		var ip net.IP
+		switch network {
+		case "tcp4", "udp4":
+			ip, err = resolver.ResolveIPv4(host)
+		default:
+			ip, err = resolver.ResolveIPv6(host)
+		}
+
+		if err != nil {
+			return nil, err
+		}
+
+		if DialHook != nil {
+			if err := DialHook(dialer, network, ip); err != nil {
+				return nil, err
+			}
+		}
+		return dialer.DialContext(ctx, network, net.JoinHostPort(ip.String(), port))
+	case "tcp", "udp":
+		return dualStackDailContext(ctx, network, address)
+	default:
+		return nil, errors.New("network invalid")
+	}
+}
+
+func ListenPacket(network, address string) (net.PacketConn, error) {
+	lc, err := ListenConfig()
+	if err != nil {
+		return nil, err
+	}
+
+	if ListenPacketHook != nil && address == "" {
+		ip, err := ListenPacketHook()
+		if err != nil {
+			return nil, err
+		}
+		address = net.JoinHostPort(ip.String(), "0")
+	}
+	return lc.ListenPacket(context.Background(), network, address)
+}
+
+func dualStackDailContext(ctx context.Context, network, address string) (net.Conn, error) {
+	host, port, err := net.SplitHostPort(address)
+	if err != nil {
+		return nil, err
+	}
+
+	returned := make(chan struct{})
+	defer close(returned)
+
+	type dialResult struct {
+		net.Conn
+		error
+		resolved bool
+		ipv6     bool
+		done     bool
+	}
+	results := make(chan dialResult)
+	var primary, fallback dialResult
+
+	startRacer := func(ctx context.Context, network, host string, ipv6 bool) {
+		result := dialResult{ipv6: ipv6, done: true}
+		defer func() {
+			select {
+			case results <- result:
+			case <-returned:
+				if result.Conn != nil {
+					result.Conn.Close()
+				}
+			}
+		}()
+
+		dialer, err := Dialer()
+		if err != nil {
+			result.error = err
+			return
+		}
+
+		var ip net.IP
+		if ipv6 {
+			ip, result.error = resolver.ResolveIPv6(host)
+		} else {
+			ip, result.error = resolver.ResolveIPv4(host)
+		}
+		if result.error != nil {
+			return
+		}
+		result.resolved = true
+
+		if DialHook != nil {
+			if result.error = DialHook(dialer, network, ip); result.error != nil {
+				return
+			}
+		}
+		result.Conn, result.error = dialer.DialContext(ctx, network, net.JoinHostPort(ip.String(), port))
+	}
+
+	go startRacer(ctx, network+"4", host, false)
+	go startRacer(ctx, network+"6", host, true)
+
+	for {
+		select {
+		case res := <-results:
+			if res.error == nil {
+				return res.Conn, nil
+			}
+
+			if !res.ipv6 {
+				primary = res
+			} else {
+				fallback = res
+			}
+
+			if primary.done && fallback.done {
+				if primary.resolved {
+					return nil, primary.error
+				} else if fallback.resolved {
+					return nil, fallback.error
+				} else {
+					return nil, primary.error
+				}
+			}
+		}
+	}
+}

component/dialer/hook.go

@@ -0,0 +1,148 @@
+package dialer
+
+import (
+	"errors"
+	"net"
+	"time"
+
+	"github.com/Dreamacro/clash/common/singledo"
+)
+
+type DialerHookFunc = func(dialer *net.Dialer) error
+type DialHookFunc = func(dialer *net.Dialer, network string, ip net.IP) error
+type ListenConfigHookFunc = func(*net.ListenConfig) error
+type ListenPacketHookFunc = func() (net.IP, error)
+
+var (
+	DialerHook       DialerHookFunc
+	DialHook         DialHookFunc
+	ListenConfigHook ListenConfigHookFunc
+	ListenPacketHook ListenPacketHookFunc
+)
+
+var (
+	ErrAddrNotFound      = errors.New("addr not found")
+	ErrNetworkNotSupport = errors.New("network not support")
+)
+
+func lookupTCPAddr(ip net.IP, addrs []net.Addr) (*net.TCPAddr, error) {
+	ipv4 := ip.To4() != nil
+
+	for _, elm := range addrs {
+		addr, ok := elm.(*net.IPNet)
+		if !ok {
+			continue
+		}
+
+		addrV4 := addr.IP.To4() != nil
+
+		if addrV4 && ipv4 {
+			return &net.TCPAddr{IP: addr.IP, Port: 0}, nil
+		} else if !addrV4 && !ipv4 {
+			return &net.TCPAddr{IP: addr.IP, Port: 0}, nil
+		}
+	}
+
+	return nil, ErrAddrNotFound
+}
+
+func lookupUDPAddr(ip net.IP, addrs []net.Addr) (*net.UDPAddr, error) {
+	ipv4 := ip.To4() != nil
+
+	for _, elm := range addrs {
+		addr, ok := elm.(*net.IPNet)
+		if !ok {
+			continue
+		}
+
+		addrV4 := addr.IP.To4() != nil
+
+		if addrV4 && ipv4 {
+			return &net.UDPAddr{IP: addr.IP, Port: 0}, nil
+		} else if !addrV4 && !ipv4 {
+			return &net.UDPAddr{IP: addr.IP, Port: 0}, nil
+		}
+	}
+
+	return nil, ErrAddrNotFound
+}
+
+func ListenPacketWithInterface(name string) ListenPacketHookFunc {
+	single := singledo.NewSingle(5 * time.Second)
+
+	return func() (net.IP, error) {
+		elm, err, _ := single.Do(func() (interface{}, error) {
+			iface, err := net.InterfaceByName(name)
+			if err != nil {
+				return nil, err
+			}
+
+			addrs, err := iface.Addrs()
+			if err != nil {
+				return nil, err
+			}
+
+			return addrs, nil
+		})
+
+		if err != nil {
+			return nil, err
+		}
+
+		addrs := elm.([]net.Addr)
+
+		for _, elm := range addrs {
+			addr, ok := elm.(*net.IPNet)
+			if !ok || addr.IP.To4() == nil {
+				continue
+			}
+
+			return addr.IP, nil
+		}
+
+		return nil, ErrAddrNotFound
+	}
+}
+
+func DialerWithInterface(name string) DialHookFunc {
+	single := singledo.NewSingle(5 * time.Second)
+
+	return func(dialer *net.Dialer, network string, ip net.IP) error {
+		elm, err, _ := single.Do(func() (interface{}, error) {
+			iface, err := net.InterfaceByName(name)
+			if err != nil {
+				return nil, err
+			}
+
+			addrs, err := iface.Addrs()
+			if err != nil {
+				return nil, err
+			}
+
+			return addrs, nil
+		})
+
+		if err != nil {
+			return err
+		}
+
+		addrs := elm.([]net.Addr)
+
+		switch network {
+		case "tcp", "tcp4", "tcp6":
+			if addr, err := lookupTCPAddr(ip, addrs); err == nil {
+				dialer.LocalAddr = addr
+			} else {
+				return err
+			}
+		case "udp", "udp4", "udp6":
+			if addr, err := lookupUDPAddr(ip, addrs); err == nil {
+				dialer.LocalAddr = addr
+			} else {
+				return err
+			}
+		}
+
+		return nil
+	}
+}

component/domain-trie/tire.go

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

component/domain-trie/trie_test.go

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

component/mmdb/mmdb.go

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

component/nat/table.go

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

component/resolver/resolver.go

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

component/simple-obfs/http.go

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

component/simple-obfs/tls.go

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

component/socks5/socks5.go

@@ -178,7 +178,7 @@ func ServerHandshake(rw net.Conn, authenticator auth.Authenticator) (addr Addr,
 	}
 
 	command = buf[1]
-	addr, err = readAddr(rw, buf)
+	addr, err = ReadAddr(rw, buf)
 	if err != nil {
 		return
 	}
@@ -260,10 +260,10 @@ func ClientHandshake(rw io.ReadWriter, addr Addr, command Command, user *User) (
 		return nil, err
 	}
 
-	return readAddr(rw, buf)
+	return ReadAddr(rw, buf)
 }
 
-func readAddr(r io.Reader, b []byte) (Addr, error) {
+func ReadAddr(r io.Reader, b []byte) (Addr, error) {
 	if len(b) < MaxAddrLen {
 		return nil, io.ErrShortBuffer
 	}

component/trojan/trojan.go

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

component/v2ray-plugin/websocket.go

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

component/vmess/aead.go

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

component/vmess/chunk.go

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

component/vmess/http.go

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

component/vmess/tls.go

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

component/vmess/vmess.go

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

component/vmess/websocket.go

@@ -25,11 +25,13 @@ type websocketConn struct {
 }
 
 type WebsocketConfig struct {
-	Host      string
-	Path      string
-	Headers   http.Header
-	TLS       bool
-	TLSConfig *tls.Config
+	Host           string
+	Port           string
+	Path           string
+	Headers        http.Header
+	TLS            bool
+	SkipCertVerify bool
+	SessionCache   tls.ClientSessionCache
 }
 
 // Read implements net.Conn.Read()
@@ -111,7 +113,7 @@ func (wsc *websocketConn) SetWriteDeadline(t time.Time) error {
 	return wsc.conn.SetWriteDeadline(t)
 }
 
-func NewWebsocketConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
+func StreamWebsocketConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
 	dialer := &websocket.Dialer{
 		NetDial: func(network, addr string) (net.Conn, error) {
 			return conn, nil
@@ -124,17 +126,20 @@ func NewWebsocketConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
 	scheme := "ws"
 	if c.TLS {
 		scheme = "wss"
-		dialer.TLSClientConfig = c.TLSConfig
-	}
+		dialer.TLSClientConfig = &tls.Config{
+			ServerName:         c.Host,
+			InsecureSkipVerify: c.SkipCertVerify,
+			ClientSessionCache: c.SessionCache,
+		}
 
-	host, port, _ := net.SplitHostPort(c.Host)
-	if (scheme == "ws" && port != "80") || (scheme == "wss" && port != "443") {
-		host = c.Host
+		if host := c.Headers.Get("Host"); host != "" {
+			dialer.TLSClientConfig.ServerName = host
+		}
 	}
 
 	uri := url.URL{
 		Scheme: scheme,
-		Host:   host,
+		Host:   net.JoinHostPort(c.Host, c.Port),
 		Path:   c.Path,
 	}
 
@@ -151,7 +156,7 @@ func NewWebsocketConn(conn net.Conn, c *WebsocketConfig) (net.Conn, error) {
 		if resp != nil {
 			reason = resp.Status
 		}
-		return nil, fmt.Errorf("Dial %s error: %s", host, reason)
+		return nil, fmt.Errorf("Dial %s error: %s", uri.Host, reason)
 	}
 
 	return &websocketConn{

config/config.go

@@ -1,6 +1,7 @@
 package config
 
 import (
+	"errors"
 	"fmt"
 	"net"
 	"net/url"
@@ -30,7 +31,7 @@ type General struct {
 	Authentication     []string     `json:"authentication"`
 	AllowLan           bool         `json:"allow-lan"`
 	BindAddress        string       `json:"bind-address"`
-	Mode               T.Mode       `json:"mode"`
+	Mode               T.TunnelMode `json:"mode"`
 	LogLevel           log.LogLevel `json:"log-level"`
 	ExternalController string       `json:"-"`
 	ExternalUI         string       `json:"-"`
@@ -39,14 +40,15 @@ type General struct {
 
 // DNS config
 type DNS struct {
-	Enable         bool             `yaml:"enable"`
-	IPv6           bool             `yaml:"ipv6"`
-	NameServer     []dns.NameServer `yaml:"nameserver"`
-	Fallback       []dns.NameServer `yaml:"fallback"`
-	FallbackFilter FallbackFilter   `yaml:"fallback-filter"`
-	Listen         string           `yaml:"listen"`
-	EnhancedMode   dns.EnhancedMode `yaml:"enhanced-mode"`
-	FakeIPRange    *fakeip.Pool
+	Enable            bool             `yaml:"enable"`
+	IPv6              bool             `yaml:"ipv6"`
+	NameServer        []dns.NameServer `yaml:"nameserver"`
+	Fallback          []dns.NameServer `yaml:"fallback"`
+	FallbackFilter    FallbackFilter   `yaml:"fallback-filter"`
+	Listen            string           `yaml:"listen"`
+	EnhancedMode      dns.EnhancedMode `yaml:"enhanced-mode"`
+	DefaultNameserver []dns.NameServer `yaml:"default-nameserver"`
+	FakeIPRange       *fakeip.Pool
 }
 
 // FallbackFilter config
@@ -57,7 +59,8 @@ type FallbackFilter struct {
 
 // Experimental config
 type Experimental struct {
-	IgnoreResolveFail bool `yaml:"ignore-resolve-fail"`
+	IgnoreResolveFail bool   `yaml:"ignore-resolve-fail"`
+	Interface         string `yaml:"interface-name"`
 }
 
 // Config is clash config manager
@@ -72,51 +75,65 @@ type Config struct {
 	Providers    map[string]provider.ProxyProvider
 }
 
-type rawDNS struct {
-	Enable         bool              `yaml:"enable"`
-	IPv6           bool              `yaml:"ipv6"`
-	NameServer     []string          `yaml:"nameserver"`
-	Fallback       []string          `yaml:"fallback"`
-	FallbackFilter rawFallbackFilter `yaml:"fallback-filter"`
-	Listen         string            `yaml:"listen"`
-	EnhancedMode   dns.EnhancedMode  `yaml:"enhanced-mode"`
-	FakeIPRange    string            `yaml:"fake-ip-range"`
-	FakeIPFilter   []string          `yaml:"fake-ip-filter"`
+type RawDNS struct {
+	Enable            bool              `yaml:"enable"`
+	IPv6              bool              `yaml:"ipv6"`
+	NameServer        []string          `yaml:"nameserver"`
+	Fallback          []string          `yaml:"fallback"`
+	FallbackFilter    RawFallbackFilter `yaml:"fallback-filter"`
+	Listen            string            `yaml:"listen"`
+	EnhancedMode      dns.EnhancedMode  `yaml:"enhanced-mode"`
+	FakeIPRange       string            `yaml:"fake-ip-range"`
+	FakeIPFilter      []string          `yaml:"fake-ip-filter"`
+	DefaultNameserver []string          `yaml:"default-nameserver"`
 }
 
-type rawFallbackFilter struct {
+type RawFallbackFilter struct {
 	GeoIP  bool     `yaml:"geoip"`
 	IPCIDR []string `yaml:"ipcidr"`
 }
 
-type rawConfig struct {
+type RawConfig struct {
 	Port               int          `yaml:"port"`
 	SocksPort          int          `yaml:"socks-port"`
 	RedirPort          int          `yaml:"redir-port"`
 	Authentication     []string     `yaml:"authentication"`
 	AllowLan           bool         `yaml:"allow-lan"`
 	BindAddress        string       `yaml:"bind-address"`
-	Mode               T.Mode       `yaml:"mode"`
+	Mode               T.TunnelMode `yaml:"mode"`
 	LogLevel           log.LogLevel `yaml:"log-level"`
 	ExternalController string       `yaml:"external-controller"`
 	ExternalUI         string       `yaml:"external-ui"`
 	Secret             string       `yaml:"secret"`
 
-	ProxyProvider map[string]map[string]interface{} `yaml:"proxy-provider"`
+	ProxyProvider map[string]map[string]interface{} `yaml:"proxy-providers"`
 	Hosts         map[string]string                 `yaml:"hosts"`
-	DNS           rawDNS                            `yaml:"dns"`
+	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"`
+	Proxy         []map[string]interface{}          `yaml:"proxies"`
+	ProxyGroup    []map[string]interface{}          `yaml:"proxy-groups"`
+	Rule          []string                          `yaml:"rules"`
+
+	// remove after 1.0
+	ProxyProviderOld map[string]map[string]interface{} `yaml:"proxy-provider"`
+	ProxyOld         []map[string]interface{}          `yaml:"Proxy"`
+	ProxyGroupOld    []map[string]interface{}          `yaml:"Proxy Group"`
+	RuleOld          []string                          `yaml:"Rule"`
 }
 
 // Parse config
 func Parse(buf []byte) (*Config, error) {
-	config := &Config{}
+	rawCfg, err := UnmarshalRawConfig(buf)
+	if err != nil {
+		return nil, err
+	}
 
+	return ParseRawConfig(rawCfg)
+}
+
+func UnmarshalRawConfig(buf []byte) (*RawConfig, error) {
 	// config with some default value
-	rawCfg := &rawConfig{
+	rawCfg := &RawConfig{
 		AllowLan:       false,
 		BindAddress:    "*",
 		Mode:           T.Rule,
@@ -129,19 +146,35 @@ func Parse(buf []byte) (*Config, error) {
 		Experimental: Experimental{
 			IgnoreResolveFail: true,
 		},
-		DNS: rawDNS{
+		DNS: RawDNS{
 			Enable:      false,
 			FakeIPRange: "198.18.0.1/16",
-			FallbackFilter: rawFallbackFilter{
+			FallbackFilter: RawFallbackFilter{
 				GeoIP:  true,
 				IPCIDR: []string{},
 			},
+			DefaultNameserver: []string{
+				"114.114.114.114",
+				"8.8.8.8",
+			},
 		},
+
+		// remove after 1.0
+		RuleOld:       []string{},
+		ProxyOld:      []map[string]interface{}{},
+		ProxyGroupOld: []map[string]interface{}{},
 	}
+
 	if err := yaml.Unmarshal(buf, &rawCfg); err != nil {
 		return nil, err
 	}
 
+	return rawCfg, nil
+}
+
+func ParseRawConfig(rawCfg *RawConfig) (*Config, error) {
+	config := &Config{}
+
 	config.Experimental = &rawCfg.Experimental
 
 	general, err := parseGeneral(rawCfg)
@@ -176,10 +209,11 @@ func Parse(buf []byte) (*Config, error) {
 	config.Hosts = hosts
 
 	config.Users = parseAuthentication(rawCfg.Authentication)
+
 	return config, nil
 }
 
-func parseGeneral(cfg *rawConfig) (*General, error) {
+func parseGeneral(cfg *RawConfig) (*General, error) {
 	port := cfg.Port
 	socksPort := cfg.SocksPort
 	redirPort := cfg.RedirPort
@@ -192,7 +226,7 @@ func parseGeneral(cfg *rawConfig) (*General, error) {
 	logLevel := cfg.LogLevel
 
 	if externalUI != "" {
-		externalUI = C.Path.Reslove(externalUI)
+		externalUI = C.Path.Resolve(externalUI)
 
 		if _, err := os.Stat(externalUI); os.IsNotExist(err) {
 			return nil, fmt.Errorf("external-ui: %s not exist", externalUI)
@@ -214,7 +248,7 @@ func parseGeneral(cfg *rawConfig) (*General, error) {
 	return general, nil
 }
 
-func parseProxies(cfg *rawConfig) (proxies map[string]C.Proxy, providersMap map[string]provider.ProxyProvider, err error) {
+func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[string]provider.ProxyProvider, err error) {
 	proxies = make(map[string]C.Proxy)
 	providersMap = make(map[string]provider.ProxyProvider)
 	proxyList := []string{}
@@ -222,14 +256,17 @@ func parseProxies(cfg *rawConfig) (proxies map[string]C.Proxy, providersMap map[
 	groupsConfig := cfg.ProxyGroup
 	providersConfig := cfg.ProxyProvider
 
-	defer func() {
-		// Destroy already created provider when err != nil
-		if err != nil {
-			for _, provider := range providersMap {
-				provider.Destroy()
-			}
-		}
-	}()
+	if len(proxiesConfig) == 0 {
+		proxiesConfig = cfg.ProxyOld
+	}
+
+	if len(groupsConfig) == 0 {
+		groupsConfig = cfg.ProxyGroupOld
+	}
+
+	if len(providersConfig) == 0 {
+		providersConfig = cfg.ProxyProviderOld
+	}
 
 	proxies["DIRECT"] = outbound.NewProxy(outbound.NewDirect())
 	proxies["REJECT"] = outbound.NewProxy(outbound.NewReject())
@@ -249,7 +286,7 @@ func parseProxies(cfg *rawConfig) (proxies map[string]C.Proxy, providersMap map[
 		proxyList = append(proxyList, proxy.Name())
 	}
 
-	// keep the origional order of ProxyGroups in config file
+	// keep the original order of ProxyGroups in config file
 	for idx, mapping := range groupsConfig {
 		groupName, existName := mapping["name"].(string)
 		if !existName {
@@ -299,7 +336,7 @@ func parseProxies(cfg *rawConfig) (proxies map[string]C.Proxy, providersMap map[
 		proxies[groupName] = outbound.NewProxy(group)
 	}
 
-	// initial compatible provier
+	// initial compatible provider
 	for _, pd := range providersMap {
 		if pd.VehicleType() != provider.Compatible {
 			continue
@@ -316,7 +353,7 @@ func parseProxies(cfg *rawConfig) (proxies map[string]C.Proxy, providersMap map[
 		ps = append(ps, proxies[v])
 	}
 	hc := provider.NewHealthCheck(ps, "", 0)
-	pd, _ := provider.NewCompatibleProvier(provider.ReservedName, ps, hc)
+	pd, _ := provider.NewCompatibleProvider(provider.ReservedName, ps, hc)
 	providersMap[provider.ReservedName] = pd
 
 	global := outboundgroup.NewSelector("GLOBAL", []provider.ProxyProvider{pd})
@@ -324,10 +361,16 @@ func parseProxies(cfg *rawConfig) (proxies map[string]C.Proxy, providersMap map[
 	return proxies, providersMap, nil
 }
 
-func parseRules(cfg *rawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
+func parseRules(cfg *RawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
 	rules := []C.Rule{}
 
 	rulesConfig := cfg.Rule
+
+	// remove after 1.0
+	if len(rulesConfig) == 0 {
+		rulesConfig = cfg.RuleOld
+	}
+
 	// parse rules
 	for idx, line := range rulesConfig {
 		rule := trimArr(strings.Split(line, ","))
@@ -403,7 +446,7 @@ func parseRules(cfg *rawConfig, proxies map[string]C.Proxy) ([]C.Rule, error) {
 	return rules, nil
 }
 
-func parseHosts(cfg *rawConfig) (*trie.Trie, error) {
+func parseHosts(cfg *RawConfig) (*trie.Trie, error) {
 	tree := trie.New()
 	if len(cfg.Hosts) != 0 {
 		for domain, ipStr := range cfg.Hosts {
@@ -448,20 +491,20 @@ func parseNameServer(servers []string) ([]dns.NameServer, error) {
 			return nil, fmt.Errorf("DNS NameServer[%d] format error: %s", idx, err.Error())
 		}
 
-		var host, dnsNetType string
+		var addr, dnsNetType string
 		switch u.Scheme {
 		case "udp":
-			host, err = hostWithDefaultPort(u.Host, "53")
+			addr, err = hostWithDefaultPort(u.Host, "53")
 			dnsNetType = "" // UDP
 		case "tcp":
-			host, err = hostWithDefaultPort(u.Host, "53")
+			addr, err = hostWithDefaultPort(u.Host, "53")
 			dnsNetType = "tcp" // TCP
 		case "tls":
-			host, err = hostWithDefaultPort(u.Host, "853")
+			addr, err = hostWithDefaultPort(u.Host, "853")
 			dnsNetType = "tcp-tls" // DNS over TLS
 		case "https":
 			clearURL := url.URL{Scheme: "https", Host: u.Host, Path: u.Path}
-			host = clearURL.String()
+			addr = clearURL.String()
 			dnsNetType = "https" // DNS over HTTPS
 		default:
 			return nil, fmt.Errorf("DNS NameServer[%d] unsupport scheme: %s", idx, u.Scheme)
@@ -475,7 +518,7 @@ func parseNameServer(servers []string) ([]dns.NameServer, error) {
 			nameservers,
 			dns.NameServer{
 				Net:  dnsNetType,
-				Addr: host,
+				Addr: addr,
 			},
 		)
 	}
@@ -496,7 +539,7 @@ func parseFallbackIPCIDR(ips []string) ([]*net.IPNet, error) {
 	return ipNets, nil
 }
 
-func parseDNS(cfg rawDNS) (*DNS, error) {
+func parseDNS(cfg RawDNS) (*DNS, error) {
 	if cfg.Enable && len(cfg.NameServer) == 0 {
 		return nil, fmt.Errorf("If DNS configuration is turned on, NameServer cannot be empty")
 	}
@@ -519,6 +562,20 @@ func parseDNS(cfg rawDNS) (*DNS, error) {
 		return nil, err
 	}
 
+	if len(cfg.DefaultNameserver) == 0 {
+		return nil, errors.New("default nameserver should have at least one nameserver")
+	}
+	if dnsCfg.DefaultNameserver, err = parseNameServer(cfg.DefaultNameserver); err != nil {
+		return nil, err
+	}
+	// check default nameserver is pure ip addr
+	for _, ns := range dnsCfg.DefaultNameserver {
+		host, _, err := net.SplitHostPort(ns.Addr)
+		if err != nil || net.ParseIP(host) == nil {
+			return nil, errors.New("default nameserver should be pure IP")
+		}
+	}
+
 	if cfg.EnhancedMode == dns.FAKEIP {
 		_, ipnet, err := net.ParseCIDR(cfg.FakeIPRange)
 		if err != nil {

config/initial.go

@@ -1,52 +1,49 @@
 package config
 
 import (
-	"archive/tar"
-	"compress/gzip"
 	"fmt"
 	"io"
 	"net/http"
 	"os"
-	"strings"
 
+	"github.com/Dreamacro/clash/component/mmdb"
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/log"
 )
 
 func downloadMMDB(path string) (err error) {
-	resp, err := http.Get("http://geolite.maxmind.com/download/geoip/database/GeoLite2-Country.tar.gz")
+	resp, err := http.Get("https://github.com/Dreamacro/maxmind-geoip/releases/latest/download/Country.mmdb")
 	if err != nil {
 		return
 	}
 	defer resp.Body.Close()
 
-	gr, err := gzip.NewReader(resp.Body)
+	f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0644)
 	if err != nil {
-		return
+		return err
 	}
-	defer gr.Close()
+	defer f.Close()
+	_, err = io.Copy(f, resp.Body)
 
-	tr := tar.NewReader(gr)
-	for {
-		h, err := tr.Next()
-		if err == io.EOF {
-			break
-		} else if err != nil {
-			return err
+	return err
+}
+
+func initMMDB() error {
+	if _, err := os.Stat(C.Path.MMDB()); os.IsNotExist(err) {
+		log.Infoln("Can't find MMDB, start download")
+		if err := downloadMMDB(C.Path.MMDB()); err != nil {
+			return fmt.Errorf("Can't download MMDB: %s", err.Error())
+		}
+	}
+
+	if !mmdb.Verify() {
+		log.Warnln("MMDB invalid, remove and download")
+		if err := os.Remove(C.Path.MMDB()); err != nil {
+			return fmt.Errorf("Can't remove invalid MMDB: %s", err.Error())
 		}
 
-		if !strings.HasSuffix(h.Name, "GeoLite2-Country.mmdb") {
-			continue
-		}
-
-		f, err := os.OpenFile(path, os.O_CREATE|os.O_WRONLY, 0644)
-		if err != nil {
-			return err
-		}
-		defer f.Close()
-		_, err = io.Copy(f, tr)
-		if err != nil {
-			return err
+		if err := downloadMMDB(C.Path.MMDB()); err != nil {
+			return fmt.Errorf("Can't download MMDB: %s", err.Error())
 		}
 	}
 
@@ -64,17 +61,18 @@ func Init(dir string) error {
 
 	// initial config.yaml
 	if _, err := os.Stat(C.Path.Config()); os.IsNotExist(err) {
-		log.Infoln("Can't find config, create an empty file")
-		os.OpenFile(C.Path.Config(), os.O_CREATE|os.O_WRONLY, 0644)
+		log.Infoln("Can't find config, create a initial config file")
+		f, err := os.OpenFile(C.Path.Config(), os.O_CREATE|os.O_WRONLY, 0644)
+		if err != nil {
+			return fmt.Errorf("Can't create file %s: %s", C.Path.Config(), err.Error())
+		}
+		f.Write([]byte(`port: 7890`))
+		f.Close()
 	}
 
 	// initial mmdb
-	if _, err := os.Stat(C.Path.MMDB()); os.IsNotExist(err) {
-		log.Infoln("Can't find MMDB, start download")
-		err := downloadMMDB(C.Path.MMDB())
-		if err != nil {
-			return fmt.Errorf("Can't download MMDB: %s", err.Error())
-		}
+	if err := initMMDB(); err != nil {
+		return fmt.Errorf("Can't initial MMDB: %w", err)
 	}
 	return nil
 }

constant/adapters.go

@@ -10,15 +10,19 @@ import (
 // Adapter Type
 const (
 	Direct AdapterType = iota
-	Fallback
 	Reject
-	Selector
+
 	Shadowsocks
 	Snell
 	Socks5
 	Http
-	URLTest
 	Vmess
+	Trojan
+
+	Relay
+	Selector
+	Fallback
+	URLTest
 	LoadBalance
 )
 
@@ -53,15 +57,20 @@ type Conn interface {
 type PacketConn interface {
 	net.PacketConn
 	Connection
+	WriteWithMetadata(p []byte, metadata *Metadata) (n int, err error)
 }
 
 type ProxyAdapter interface {
 	Name() string
 	Type() AdapterType
+	StreamConn(c net.Conn, metadata *Metadata) (net.Conn, error)
 	DialContext(ctx context.Context, metadata *Metadata) (Conn, error)
-	DialUDP(metadata *Metadata) (PacketConn, net.Addr, error)
+	DialUDP(metadata *Metadata) (PacketConn, error)
 	SupportUDP() bool
 	MarshalJSON() ([]byte, error)
+	Addr() string
+	// Unwrap extracts the proxy from a proxy-group. It returns nil when nothing to extract.
+	Unwrap(metadata *Metadata) Proxy
 }
 
 type DelayHistory struct {
@@ -85,12 +94,9 @@ func (at AdapterType) String() string {
 	switch at {
 	case Direct:
 		return "Direct"
-	case Fallback:
-		return "Fallback"
 	case Reject:
 		return "Reject"
-	case Selector:
-		return "Selector"
+
 	case Shadowsocks:
 		return "Shadowsocks"
 	case Snell:
@@ -99,12 +105,22 @@ func (at AdapterType) String() string {
 		return "Socks5"
 	case Http:
 		return "Http"
-	case URLTest:
-		return "URLTest"
 	case Vmess:
 		return "Vmess"
+	case Trojan:
+		return "Trojan"
+
+	case Relay:
+		return "Relay"
+	case Selector:
+		return "Selector"
+	case Fallback:
+		return "Fallback"
+	case URLTest:
+		return "URLTest"
 	case LoadBalance:
 		return "LoadBalance"
+
 	default:
 		return "Unknown"
 	}
@@ -121,8 +137,8 @@ type UDPPacket interface {
 	//   this is important when using Fake-IP.
 	WriteBack(b []byte, addr net.Addr) (n int, err error)
 
-	// Close closes the underlaying connection.
-	Close() error
+	// Drop call after packet is used, could recycle buffer in this function.
+	Drop()
 
 	// LocalAddr returns the source IP/Port of packet
 	LocalAddr() net.Addr

constant/metadata.go

@@ -3,6 +3,7 @@ package constant
 import (
 	"encoding/json"
 	"net"
+	"strconv"
 )
 
 // Socks addr type
@@ -70,6 +71,25 @@ func (m *Metadata) RemoteAddress() string {
 	return net.JoinHostPort(m.String(), m.DstPort)
 }
 
+func (m *Metadata) SourceAddress() string {
+	return net.JoinHostPort(m.SrcIP.String(), m.SrcPort)
+}
+
+func (m *Metadata) Resolved() bool {
+	return m.DstIP != nil
+}
+
+func (m *Metadata) UDPAddr() *net.UDPAddr {
+	if m.NetWork != UDP || m.DstIP == nil {
+		return nil
+	}
+	port, _ := strconv.Atoi(m.DstPort)
+	return &net.UDPAddr{
+		IP:   m.DstIP,
+		Port: port,
+	}
+}
+
 func (m *Metadata) String() string {
 	if m.Host != "" {
 		return m.Host

constant/path.go

@@ -44,8 +44,8 @@ func (p *path) Config() string {
 	return p.configFile
 }
 
-// Reslove return a absolute path or a relative path with homedir
-func (p *path) Reslove(path string) string {
+// Resolve return a absolute path or a relative path with homedir
+func (p *path) Resolve(path string) string {
 	if !filepath.IsAbs(path) {
 		return filepath.Join(p.HomeDir(), path)
 	}

dns/client.go

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

dns/doh.go

@@ -5,8 +5,11 @@ import (
 	"context"
 	"crypto/tls"
 	"io/ioutil"
+	"net"
 	"net/http"
 
+	"github.com/Dreamacro/clash/component/dialer"
+
 	D "github.com/miekg/dns"
 )
 
@@ -15,12 +18,9 @@ const (
 	dotMimeType = "application/dns-message"
 )
 
-var dohTransport = &http.Transport{
-	TLSClientConfig: &tls.Config{ClientSessionCache: globalSessionCache},
-}
-
 type dohClient struct {
-	url string
+	url       string
+	transport *http.Transport
 }
 
 func (dc *dohClient) Exchange(m *D.Msg) (msg *D.Msg, err error) {
@@ -55,7 +55,7 @@ func (dc *dohClient) newRequest(m *D.Msg) (*http.Request, error) {
 }
 
 func (dc *dohClient) doRequest(req *http.Request) (msg *D.Msg, err error) {
-	client := &http.Client{Transport: dohTransport}
+	client := &http.Client{Transport: dc.transport}
 	resp, err := client.Do(req)
 	if err != nil {
 		return nil, err
@@ -70,3 +70,25 @@ func (dc *dohClient) doRequest(req *http.Request) (msg *D.Msg, err error) {
 	err = msg.Unpack(buf)
 	return msg, err
 }
+
+func newDoHClient(url string, r *Resolver) *dohClient {
+	return &dohClient{
+		url: url,
+		transport: &http.Transport{
+			TLSClientConfig: &tls.Config{ClientSessionCache: globalSessionCache},
+			DialContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
+				host, port, err := net.SplitHostPort(addr)
+				if err != nil {
+					return nil, err
+				}
+
+				ip, err := r.ResolveIPv4(host)
+				if err != nil {
+					return nil, err
+				}
+
+				return dialer.DialContext(ctx, "tcp4", net.JoinHostPort(ip.String(), port))
+			},
+		},
+	}
+}

dns/filters.go

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

dns/middleware.go

@@ -18,7 +18,14 @@ func withFakeIP(fakePool *fakeip.Pool) middleware {
 			q := r.Question[0]
 
 			if q.Qtype == D.TypeAAAA {
-				D.HandleFailed(w, r)
+				msg := &D.Msg{}
+				msg.Answer = []D.RR{}
+
+				msg.SetRcode(r, D.RcodeSuccess)
+				msg.Authoritative = true
+				msg.RecursionAvailable = true
+
+				w.WriteMsg(msg)
 				return
 			} else if q.Qtype != D.TypeA {
 				next(w, r)
@@ -39,7 +46,10 @@ func withFakeIP(fakePool *fakeip.Pool) middleware {
 			msg.Answer = []D.RR{rr}
 
 			setMsgTTL(msg, 1)
-			msg.SetReply(r)
+			msg.SetRcode(r, D.RcodeSuccess)
+			msg.Authoritative = true
+			msg.RecursionAvailable = true
+
 			w.WriteMsg(msg)
 			return
 		}
@@ -55,7 +65,8 @@ func withResolver(resolver *Resolver) handler {
 			D.HandleFailed(w, r)
 			return
 		}
-		msg.SetReply(r)
+		msg.SetRcode(r, msg.Rcode)
+		msg.Authoritative = true
 		w.WriteMsg(msg)
 		return
 	}

dns/resolver.go

@@ -4,38 +4,26 @@ import (
 	"context"
 	"crypto/tls"
 	"errors"
+	"fmt"
+	"math/rand"
 	"net"
 	"strings"
-	"sync"
 	"time"
 
 	"github.com/Dreamacro/clash/common/cache"
 	"github.com/Dreamacro/clash/common/picker"
-	trie "github.com/Dreamacro/clash/component/domain-trie"
 	"github.com/Dreamacro/clash/component/fakeip"
-	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/component/resolver"
 
 	D "github.com/miekg/dns"
-	geoip2 "github.com/oschwald/geoip2-golang"
 	"golang.org/x/sync/singleflight"
 )
 
-var (
-	// DefaultResolver aim to resolve ip
-	DefaultResolver *Resolver
-
-	// DefaultHosts aim to resolve hosts
-	DefaultHosts = trie.New()
-)
-
 var (
 	globalSessionCache = tls.NewLRUClientSessionCache(64)
-
-	mmdb *geoip2.Reader
-	once sync.Once
 )
 
-type resolver interface {
+type dnsClient interface {
 	Exchange(m *D.Msg) (msg *D.Msg, err error)
 	ExchangeContext(ctx context.Context, m *D.Msg) (msg *D.Msg, err error)
 }
@@ -50,36 +38,33 @@ type Resolver struct {
 	mapping         bool
 	fakeip          bool
 	pool            *fakeip.Pool
-	main            []resolver
-	fallback        []resolver
+	main            []dnsClient
+	fallback        []dnsClient
 	fallbackFilters []fallbackFilter
 	group           singleflight.Group
-	cache           *cache.Cache
+	lruCache        *cache.LruCache
 }
 
-// ResolveIP request with TypeA and TypeAAAA, priority return TypeAAAA
+// ResolveIP request with TypeA and TypeAAAA, priority return TypeA
 func (r *Resolver) ResolveIP(host string) (ip net.IP, err error) {
-	ch := make(chan net.IP)
+	ch := make(chan net.IP, 1)
 	go func() {
 		defer close(ch)
-		ip, err := r.resolveIP(host, D.TypeA)
+		ip, err := r.resolveIP(host, D.TypeAAAA)
 		if err != nil {
 			return
 		}
 		ch <- ip
 	}()
 
-	ip, err = r.resolveIP(host, D.TypeAAAA)
+	ip, err = r.resolveIP(host, D.TypeA)
 	if err == nil {
-		go func() {
-			<-ch
-		}()
 		return
 	}
 
 	ip, open := <-ch
 	if !open {
-		return nil, errIPNotFound
+		return nil, resolver.ErrIPNotFound
 	}
 
 	return ip, nil
@@ -111,31 +96,43 @@ func (r *Resolver) Exchange(m *D.Msg) (msg *D.Msg, err error) {
 	}
 
 	q := m.Question[0]
-	cache, expireTime := r.cache.GetWithExpire(q.String())
-	if cache != nil {
+	cache, expireTime, hit := r.lruCache.GetWithExpire(q.String())
+	if hit {
+		now := time.Now()
 		msg = cache.(*D.Msg).Copy()
-		setMsgTTL(msg, uint32(expireTime.Sub(time.Now()).Seconds()))
+		if expireTime.Before(now) {
+			setMsgTTL(msg, uint32(1)) // Continue fetch
+			go r.exchangeWithoutCache(m)
+		} else {
+			setMsgTTL(msg, uint32(expireTime.Sub(time.Now()).Seconds()))
+		}
 		return
 	}
+	return r.exchangeWithoutCache(m)
+}
+
+// ExchangeWithoutCache a batch of dns request, and it do NOT GET from cache
+func (r *Resolver) exchangeWithoutCache(m *D.Msg) (msg *D.Msg, err error) {
+	q := m.Question[0]
+
 	defer func() {
 		if msg == nil {
 			return
 		}
 
-		putMsgToCache(r.cache, q.String(), msg)
+		putMsgToCache(r.lruCache, q.String(), msg)
 		if r.mapping {
 			ips := r.msgToIP(msg)
 			for _, ip := range ips {
-				putMsgToCache(r.cache, ip.String(), msg)
+				putMsgToCache(r.lruCache, ip.String(), msg)
 			}
 		}
 	}()
 
-	ret, err, _ := r.group.Do(q.String(), func() (interface{}, error) {
+	ret, err, shared := r.group.Do(q.String(), func() (interface{}, error) {
 		isIPReq := isIPRequest(q)
 		if isIPReq {
-			msg, err := r.fallbackExchange(m)
-			return msg, err
+			return r.fallbackExchange(m)
 		}
 
 		return r.batchExchange(r.main, m)
@@ -143,6 +140,9 @@ func (r *Resolver) Exchange(m *D.Msg) (msg *D.Msg, err error) {
 
 	if err == nil {
 		msg = ret.(*D.Msg)
+		if shared {
+			msg = msg.Copy()
+		}
 	}
 
 	return
@@ -154,7 +154,7 @@ func (r *Resolver) IPToHost(ip net.IP) (string, bool) {
 		return r.pool.LookBack(ip)
 	}
 
-	cache := r.cache.Get(ip.String())
+	cache, _ := r.lruCache.Get(ip.String())
 	if cache == nil {
 		return "", false
 	}
@@ -179,22 +179,28 @@ func (r *Resolver) IsFakeIP(ip net.IP) bool {
 	return false
 }
 
-func (r *Resolver) batchExchange(clients []resolver, m *D.Msg) (msg *D.Msg, err error) {
-	fast, ctx := picker.WithTimeout(context.Background(), time.Second)
+func (r *Resolver) batchExchange(clients []dnsClient, m *D.Msg) (msg *D.Msg, err error) {
+	fast, ctx := picker.WithTimeout(context.Background(), time.Second*5)
 	for _, client := range clients {
 		r := client
 		fast.Go(func() (interface{}, error) {
-			msg, err := r.ExchangeContext(ctx, m)
-			if err != nil || msg.Rcode != D.RcodeSuccess {
-				return nil, errors.New("resolve error")
+			m, err := r.ExchangeContext(ctx, m)
+			if err != nil {
+				return nil, err
+			} else if m.Rcode == D.RcodeServerFailure || m.Rcode == D.RcodeRefused {
+				return nil, errors.New("server failure")
 			}
-			return msg, nil
+			return m, nil
 		})
 	}
 
 	elm := fast.Wait()
 	if elm == nil {
-		return nil, errors.New("All DNS requests failed")
+		err := errors.New("All DNS requests failed")
+		if fErr := fast.Error(); fErr != nil {
+			err = fmt.Errorf("%w, first error: %s", err, fErr.Error())
+		}
+		return nil, err
 	}
 
 	msg = elm.(*D.Msg)
@@ -212,9 +218,9 @@ func (r *Resolver) fallbackExchange(m *D.Msg) (msg *D.Msg, err error) {
 	res := <-msgCh
 	if res.Error == nil {
 		if ips := r.msgToIP(res.Msg); len(ips) != 0 {
-			if r.shouldFallback(ips[0]) {
-				go func() { <-fallbackMsg }()
+			if !r.shouldFallback(ips[0]) {
 				msg = res.Msg
+				err = res.Error
 				return msg, err
 			}
 		}
@@ -233,6 +239,8 @@ func (r *Resolver) resolveIP(host string, dnsType uint16) (ip net.IP, err error)
 			return ip, nil
 		} else if dnsType == D.TypeA && isIPv4 {
 			return ip, nil
+		} else {
+			return nil, resolver.ErrIPVersion
 		}
 	}
 
@@ -245,11 +253,12 @@ func (r *Resolver) resolveIP(host string, dnsType uint16) (ip net.IP, err error)
 	}
 
 	ips := r.msgToIP(msg)
-	if len(ips) == 0 {
-		return nil, errIPNotFound
+	ipLength := len(ips)
+	if ipLength == 0 {
+		return nil, resolver.ErrIPNotFound
 	}
 
-	ip = ips[0]
+	ip = ips[rand.Intn(ipLength)]
 	return
 }
 
@@ -268,8 +277,8 @@ func (r *Resolver) msgToIP(msg *D.Msg) []net.IP {
 	return ips
 }
 
-func (r *Resolver) asyncExchange(client []resolver, msg *D.Msg) <-chan *result {
-	ch := make(chan *result)
+func (r *Resolver) asyncExchange(client []dnsClient, msg *D.Msg) <-chan *result {
+	ch := make(chan *result, 1)
 	go func() {
 		res, err := r.batchExchange(client, msg)
 		ch <- &result{Msg: res, Error: err}
@@ -289,6 +298,7 @@ type FallbackFilter struct {
 
 type Config struct {
 	Main, Fallback []NameServer
+	Default        []NameServer
 	IPv6           bool
 	EnhancedMode   EnhancedMode
 	FallbackFilter FallbackFilter
@@ -296,25 +306,26 @@ type Config struct {
 }
 
 func New(config Config) *Resolver {
+	defaultResolver := &Resolver{
+		main:     transform(config.Default, nil),
+		lruCache: cache.NewLRUCache(cache.WithSize(4096), cache.WithStale(true)),
+	}
+
 	r := &Resolver{
-		ipv6:    config.IPv6,
-		main:    transform(config.Main),
-		cache:   cache.New(time.Second * 60),
-		mapping: config.EnhancedMode == MAPPING,
-		fakeip:  config.EnhancedMode == FAKEIP,
-		pool:    config.Pool,
+		ipv6:     config.IPv6,
+		main:     transform(config.Main, defaultResolver),
+		lruCache: cache.NewLRUCache(cache.WithSize(4096), cache.WithStale(true)),
+		mapping:  config.EnhancedMode == MAPPING,
+		fakeip:   config.EnhancedMode == FAKEIP,
+		pool:     config.Pool,
 	}
 
 	if len(config.Fallback) != 0 {
-		r.fallback = transform(config.Fallback)
+		r.fallback = transform(config.Fallback, defaultResolver)
 	}
 
 	fallbackFilters := []fallbackFilter{}
 	if config.FallbackFilter.GeoIP {
-		once.Do(func() {
-			mmdb, _ = geoip2.Open(C.Path.MMDB())
-		})
-
 		fallbackFilters = append(fallbackFilters, &geoipFilter{})
 	}
 	for _, ipnet := range config.FallbackFilter.IPCIDR {

dns/server.go

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

dns/util.go

@@ -4,11 +4,11 @@ import (
 	"crypto/tls"
 	"encoding/json"
 	"errors"
+	"net"
 	"time"
 
 	"github.com/Dreamacro/clash/common/cache"
 	"github.com/Dreamacro/clash/log"
-	yaml "gopkg.in/yaml.v2"
 
 	D "github.com/miekg/dns"
 )
@@ -45,8 +45,8 @@ func (e *EnhancedMode) UnmarshalYAML(unmarshal func(interface{}) error) error {
 }
 
 // MarshalYAML serialize EnhancedMode with yaml
-func (e EnhancedMode) MarshalYAML() ([]byte, error) {
-	return yaml.Marshal(e.String())
+func (e EnhancedMode) MarshalYAML() (interface{}, error) {
+	return e.String(), nil
 }
 
 // UnmarshalJSON unserialize EnhancedMode with json
@@ -79,21 +79,21 @@ func (e EnhancedMode) String() string {
 	}
 }
 
-func putMsgToCache(c *cache.Cache, key string, msg *D.Msg) {
-	var ttl time.Duration
+func putMsgToCache(c *cache.LruCache, key string, msg *D.Msg) {
+	var ttl uint32
 	switch {
 	case len(msg.Answer) != 0:
-		ttl = time.Duration(msg.Answer[0].Header().Ttl) * time.Second
+		ttl = msg.Answer[0].Header().Ttl
 	case len(msg.Ns) != 0:
-		ttl = time.Duration(msg.Ns[0].Header().Ttl) * time.Second
+		ttl = msg.Ns[0].Header().Ttl
 	case len(msg.Extra) != 0:
-		ttl = time.Duration(msg.Extra[0].Header().Ttl) * time.Second
+		ttl = msg.Extra[0].Header().Ttl
 	default:
 		log.Debugln("[DNS] response msg error: %#v", msg)
 		return
 	}
 
-	c.Put(key, msg.Copy(), ttl)
+	c.SetWithExpire(key, msg.Copy(), time.Now().Add(time.Second*time.Duration(ttl)))
 }
 
 func setMsgTTL(msg *D.Msg, ttl uint32) {
@@ -117,14 +117,15 @@ func isIPRequest(q D.Question) bool {
 	return false
 }
 
-func transform(servers []NameServer) []resolver {
-	ret := []resolver{}
+func transform(servers []NameServer, resolver *Resolver) []dnsClient {
+	ret := []dnsClient{}
 	for _, s := range servers {
 		if s.Net == "https" {
-			ret = append(ret, &dohClient{url: s.Addr})
+			ret = append(ret, newDoHClient(s.Addr, resolver))
 			continue
 		}
 
+		host, port, _ := net.SplitHostPort(s.Addr)
 		ret = append(ret, &client{
 			Client: &D.Client{
 				Net: s.Net,
@@ -132,10 +133,14 @@ func transform(servers []NameServer) []resolver {
 					ClientSessionCache: globalSessionCache,
 					// alpn identifier, see https://tools.ietf.org/html/draft-hoffman-dprive-dns-tls-alpn-00#page-6
 					NextProtos: []string{"dns"},
+					ServerName: host,
 				},
 				UDPSize: 4096,
+				Timeout: 5 * time.Second,
 			},
-			Address: s.Addr,
+			port: port,
+			host: host,
+			r:    resolver,
 		})
 	}
 	return ret

go.mod

@@ -1,23 +1,22 @@
 module github.com/Dreamacro/clash
 
-go 1.13
+go 1.14
 
 require (
 	github.com/Dreamacro/go-shadowsocks2 v0.1.5
 	github.com/eapache/queue v1.1.0 // indirect
-	github.com/go-chi/chi v4.0.2+incompatible
-	github.com/go-chi/cors v1.0.0
+	github.com/go-chi/chi v4.1.1+incompatible
+	github.com/go-chi/cors v1.1.1
 	github.com/go-chi/render v1.0.1
-	github.com/gofrs/uuid v3.2.0+incompatible
-	github.com/gorilla/websocket v1.4.1
-	github.com/miekg/dns v1.1.24
-	github.com/oschwald/geoip2-golang v1.3.0
-	github.com/oschwald/maxminddb-golang v1.5.0 // indirect
-	github.com/sirupsen/logrus v1.4.2
-	github.com/stretchr/testify v1.4.0
-	golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413
-	golang.org/x/net v0.0.0-20191207000613-e7e4b65ae663
-	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
+	github.com/gofrs/uuid v3.3.0+incompatible
+	github.com/gorilla/websocket v1.4.2
+	github.com/miekg/dns v1.1.29
+	github.com/oschwald/geoip2-golang v1.4.0
+	github.com/sirupsen/logrus v1.6.0
+	github.com/stretchr/testify v1.5.1
+	golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79
+	golang.org/x/net v0.0.0-20200506145744-7e3656a0809f
+	golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a
 	gopkg.in/eapache/channels.v1 v1.1.0
-	gopkg.in/yaml.v2 v2.2.7
+	gopkg.in/yaml.v2 v2.2.8
 )

go.sum

@@ -5,69 +5,61 @@ github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/eapache/queue v1.1.0 h1:YOEu7KNc61ntiQlcEeUIoDTJ2o8mQznoNvUhiigpIqc=
 github.com/eapache/queue v1.1.0/go.mod h1:6eCeP0CKFpHLu8blIFXhExK/dRa7WDZfr6jVFPTqq+I=
-github.com/go-chi/chi v4.0.2+incompatible h1:maB6vn6FqCxrpz4FqWdh4+lwpyZIQS7YEAUcHlgXVRs=
-github.com/go-chi/chi v4.0.2+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
-github.com/go-chi/cors v1.0.0 h1:e6x8k7uWbUwYs+aXDoiUzeQFT6l0cygBYyNhD7/1Tg0=
-github.com/go-chi/cors v1.0.0/go.mod h1:K2Yje0VW/SJzxiyMYu6iPQYa7hMjQX2i/F491VChg1I=
+github.com/go-chi/chi v4.1.1+incompatible h1:MmTgB0R8Bt/jccxp+t6S/1VGIKdJw5J74CK/c9tTfA4=
+github.com/go-chi/chi v4.1.1+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
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+github.com/go-chi/cors v1.1.1/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=
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-golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
+golang.org/x/tools v0.0.0-20191216052735-49a3e744a425/go.mod h1:TB2adYChydJhpapKDTa4BR/hXlZSLoq2Wpct/0txZ28=
+golang.org/x/xerrors v0.0.0-20191011141410-1b5146add898/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/eapache/channels.v1 v1.1.0 h1:5bGAyKKvyCTWjSj7mhefG6Lc68VyN4MH1v8/7OoeeB4=
 gopkg.in/eapache/channels.v1 v1.1.0/go.mod h1:BHIBujSvu9yMTrTYbTCjDD43gUhtmaOtTWDe7sTv1js=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
-gopkg.in/yaml.v2 v2.2.7 h1:VUgggvou5XRW9mHwD/yXxIYSMtY0zoKQf/v226p2nyo=
-gopkg.in/yaml.v2 v2.2.7/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

hooks/pre_build

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

hub/executor/executor.go

@@ -8,14 +8,16 @@ import (
 
 	"github.com/Dreamacro/clash/adapters/provider"
 	"github.com/Dreamacro/clash/component/auth"
+	"github.com/Dreamacro/clash/component/dialer"
 	trie "github.com/Dreamacro/clash/component/domain-trie"
+	"github.com/Dreamacro/clash/component/resolver"
 	"github.com/Dreamacro/clash/config"
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/dns"
 	"github.com/Dreamacro/clash/log"
 	P "github.com/Dreamacro/clash/proxy"
 	authStore "github.com/Dreamacro/clash/proxy/auth"
-	T "github.com/Dreamacro/clash/tunnel"
+	"github.com/Dreamacro/clash/tunnel"
 )
 
 // forward compatibility before 1.0
@@ -83,7 +85,7 @@ func ApplyConfig(cfg *config.Config, force bool) {
 	updateRules(cfg.Rules)
 	updateDNS(cfg.DNS)
 	updateHosts(cfg.Hosts)
-	updateExperimental(cfg.Experimental)
+	updateExperimental(cfg)
 }
 
 func GetGeneral() *config.General {
@@ -100,20 +102,30 @@ func GetGeneral() *config.General {
 		Authentication: authenticator,
 		AllowLan:       P.AllowLan(),
 		BindAddress:    P.BindAddress(),
-		Mode:           T.Instance().Mode(),
+		Mode:           tunnel.Mode(),
 		LogLevel:       log.Level(),
 	}
 
 	return general
 }
 
-func updateExperimental(c *config.Experimental) {
-	T.Instance().UpdateExperimental(c.IgnoreResolveFail)
+func updateExperimental(c *config.Config) {
+	cfg := c.Experimental
+
+	tunnel.UpdateExperimental(cfg.IgnoreResolveFail)
+	if cfg.Interface != "" && c.DNS.Enable {
+		dialer.DialHook = dialer.DialerWithInterface(cfg.Interface)
+		dialer.ListenPacketHook = dialer.ListenPacketWithInterface(cfg.Interface)
+	} else {
+		dialer.DialHook = nil
+		dialer.ListenPacketHook = nil
+	}
 }
 
 func updateDNS(c *config.DNS) {
 	if c.Enable == false {
-		dns.DefaultResolver = nil
+		resolver.DefaultResolver = nil
+		tunnel.SetResolver(nil)
 		dns.ReCreateServer("", nil)
 		return
 	}
@@ -127,8 +139,10 @@ func updateDNS(c *config.DNS) {
 			GeoIP:  c.FallbackFilter.GeoIP,
 			IPCIDR: c.FallbackFilter.IPCIDR,
 		},
+		Default: c.DefaultNameserver,
 	})
-	dns.DefaultResolver = r
+	resolver.DefaultResolver = r
+	tunnel.SetResolver(r)
 	if err := dns.ReCreateServer(c.Listen, r); err != nil {
 		log.Errorln("Start DNS server error: %s", err.Error())
 		return
@@ -140,28 +154,20 @@ func updateDNS(c *config.DNS) {
 }
 
 func updateHosts(tree *trie.Trie) {
-	dns.DefaultHosts = tree
+	resolver.DefaultHosts = tree
 }
 
 func updateProxies(proxies map[string]C.Proxy, providers map[string]provider.ProxyProvider) {
-	tunnel := T.Instance()
-	oldProviders := tunnel.Providers()
-
-	// close providers goroutine
-	for _, provider := range oldProviders {
-		provider.Destroy()
-	}
-
 	tunnel.UpdateProxies(proxies, providers)
 }
 
 func updateRules(rules []C.Rule) {
-	T.Instance().UpdateRules(rules)
+	tunnel.UpdateRules(rules)
 }
 
 func updateGeneral(general *config.General) {
 	log.SetLevel(general.LogLevel)
-	T.Instance().SetMode(general.Mode)
+	tunnel.SetMode(general.Mode)
 
 	allowLan := general.AllowLan
 	P.SetAllowLan(allowLan)

hub/hub.go

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

hub/route/configs.go

@@ -8,7 +8,7 @@ import (
 	"github.com/Dreamacro/clash/hub/executor"
 	"github.com/Dreamacro/clash/log"
 	P "github.com/Dreamacro/clash/proxy"
-	T "github.com/Dreamacro/clash/tunnel"
+	"github.com/Dreamacro/clash/tunnel"
 
 	"github.com/go-chi/chi"
 	"github.com/go-chi/render"
@@ -23,13 +23,13 @@ func configRouter() http.Handler {
 }
 
 type configSchema struct {
-	Port        *int          `json:"port"`
-	SocksPort   *int          `json:"socks-port"`
-	RedirPort   *int          `json:"redir-port"`
-	AllowLan    *bool         `json:"allow-lan"`
-	BindAddress *string       `json:"bind-address"`
-	Mode        *T.Mode       `json:"mode"`
-	LogLevel    *log.LogLevel `json:"log-level"`
+	Port        *int               `json:"port"`
+	SocksPort   *int               `json:"socks-port"`
+	RedirPort   *int               `json:"redir-port"`
+	AllowLan    *bool              `json:"allow-lan"`
+	BindAddress *string            `json:"bind-address"`
+	Mode        *tunnel.TunnelMode `json:"mode"`
+	LogLevel    *log.LogLevel      `json:"log-level"`
 }
 
 func getConfigs(w http.ResponseWriter, r *http.Request) {
@@ -67,7 +67,7 @@ func patchConfigs(w http.ResponseWriter, r *http.Request) {
 	P.ReCreateRedir(pointerOrDefault(general.RedirPort, ports.RedirPort))
 
 	if general.Mode != nil {
-		T.Instance().SetMode(*general.Mode)
+		tunnel.SetMode(*general.Mode)
 	}
 
 	if general.LogLevel != nil {

hub/route/provider.go

@@ -5,7 +5,7 @@ import (
 	"net/http"
 
 	"github.com/Dreamacro/clash/adapters/provider"
-	T "github.com/Dreamacro/clash/tunnel"
+	"github.com/Dreamacro/clash/tunnel"
 
 	"github.com/go-chi/chi"
 	"github.com/go-chi/render"
@@ -25,7 +25,7 @@ func proxyProviderRouter() http.Handler {
 }
 
 func getProviders(w http.ResponseWriter, r *http.Request) {
-	providers := T.Instance().Providers()
+	providers := tunnel.Providers()
 	render.JSON(w, r, render.M{
 		"providers": providers,
 	})
@@ -63,7 +63,7 @@ func parseProviderName(next http.Handler) http.Handler {
 func findProviderByName(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		name := r.Context().Value(CtxKeyProviderName).(string)
-		providers := T.Instance().Providers()
+		providers := tunnel.Providers()
 		provider, exist := providers[name]
 		if !exist {
 			render.Status(r, http.StatusNotFound)

hub/route/proxies.go

@@ -10,7 +10,7 @@ import (
 	"github.com/Dreamacro/clash/adapters/outbound"
 	"github.com/Dreamacro/clash/adapters/outboundgroup"
 	C "github.com/Dreamacro/clash/constant"
-	T "github.com/Dreamacro/clash/tunnel"
+	"github.com/Dreamacro/clash/tunnel"
 
 	"github.com/go-chi/chi"
 	"github.com/go-chi/render"
@@ -40,7 +40,7 @@ func parseProxyName(next http.Handler) http.Handler {
 func findProxyByName(next http.Handler) http.Handler {
 	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
 		name := r.Context().Value(CtxKeyProxyName).(string)
-		proxies := T.Instance().Proxies()
+		proxies := tunnel.Proxies()
 		proxy, exist := proxies[name]
 		if !exist {
 			render.Status(r, http.StatusNotFound)
@@ -54,7 +54,7 @@ func findProxyByName(next http.Handler) http.Handler {
 }
 
 func getProxies(w http.ResponseWriter, r *http.Request) {
-	proxies := T.Instance().Proxies()
+	proxies := tunnel.Proxies()
 	render.JSON(w, r, render.M{
 		"proxies": proxies,
 	})

hub/route/rules.go

@@ -3,7 +3,7 @@ package route
 import (
 	"net/http"
 
-	T "github.com/Dreamacro/clash/tunnel"
+	"github.com/Dreamacro/clash/tunnel"
 
 	"github.com/go-chi/chi"
 	"github.com/go-chi/render"
@@ -22,7 +22,7 @@ type Rule struct {
 }
 
 func getRules(w http.ResponseWriter, r *http.Request) {
-	rawRules := T.Instance().Rules()
+	rawRules := tunnel.Rules()
 
 	rules := []Rule{}
 	for _, rule := range rawRules {

hub/route/server.go

@@ -57,10 +57,10 @@ func Start(addr string, secret string) {
 	})
 
 	r.Use(cors.Handler)
-	r.Get("/", hello)
 	r.Group(func(r chi.Router) {
 		r.Use(authentication)
 
+		r.Get("/", hello)
 		r.Get("/logs", getLogs)
 		r.Get("/traffic", traffic)
 		r.Get("/version", version)
@@ -110,9 +110,9 @@ func authentication(next http.Handler) http.Handler {
 		header := r.Header.Get("Authorization")
 		text := strings.SplitN(header, " ", 2)
 
-		hasUnvalidHeader := text[0] != "Bearer"
-		hasUnvalidSecret := len(text) == 2 && text[1] != serverSecret
-		if hasUnvalidHeader || hasUnvalidSecret {
+		hasInvalidHeader := text[0] != "Bearer"
+		hasInvalidSecret := len(text) != 2 || text[1] != serverSecret
+		if hasInvalidHeader || hasInvalidSecret {
 			render.Status(r, http.StatusUnauthorized)
 			render.JSON(w, r, ErrUnauthorized)
 			return

log/level.go

@@ -55,6 +55,11 @@ func (l LogLevel) MarshalJSON() ([]byte, error) {
 	return json.Marshal(l.String())
 }
 
+// MarshalYAML serialize LogLevel with yaml
+func (l LogLevel) MarshalYAML() (interface{}, error) {
+	return l.String(), nil
+}
+
 func (l LogLevel) String() string {
 	switch l {
 	case INFO:

main.go

@@ -10,22 +10,38 @@ import (
 	"syscall"
 
 	"github.com/Dreamacro/clash/config"
+	"github.com/Dreamacro/clash/constant"
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/hub"
+	"github.com/Dreamacro/clash/hub/executor"
 	"github.com/Dreamacro/clash/log"
 )
 
 var (
-	version    bool
-	homeDir    string
-	configFile string
+	flagset            map[string]bool
+	version            bool
+	testConfig         bool
+	homeDir            string
+	configFile         string
+	externalUI         string
+	externalController string
+	secret             string
 )
 
 func init() {
 	flag.StringVar(&homeDir, "d", "", "set configuration directory")
 	flag.StringVar(&configFile, "f", "", "specify configuration file")
+	flag.StringVar(&externalUI, "ext-ui", "", "override external ui directory")
+	flag.StringVar(&externalController, "ext-ctl", "", "override external controller address")
+	flag.StringVar(&secret, "secret", "", "override secret for RESTful API")
 	flag.BoolVar(&version, "v", false, "show current version of clash")
+	flag.BoolVar(&testConfig, "t", false, "test configuration and exit")
 	flag.Parse()
+
+	flagset = map[string]bool{}
+	flag.Visit(func(f *flag.Flag) {
+		flagset[f.Name] = true
+	})
 }
 
 func main() {
@@ -57,7 +73,28 @@ func main() {
 		log.Fatalln("Initial configuration directory error: %s", err.Error())
 	}
 
-	if err := hub.Parse(); err != nil {
+	if testConfig {
+		if _, err := executor.Parse(); err != nil {
+			log.Errorln(err.Error())
+			fmt.Printf("configuration file %s test failed\n", constant.Path.Config())
+			os.Exit(1)
+		}
+		fmt.Printf("configuration file %s test is successful\n", constant.Path.Config())
+		return
+	}
+
+	var options []hub.Option
+	if flagset["ext-ui"] {
+		options = append(options, hub.WithExternalUI(externalUI))
+	}
+	if flagset["ext-ctl"] {
+		options = append(options, hub.WithExternalController(externalController))
+	}
+	if flagset["secret"] {
+		options = append(options, hub.WithSecret(secret))
+	}
+
+	if err := hub.Parse(options...); err != nil {
 		log.Fatalln("Parse config error: %s", err.Error())
 	}
 

proxy/http/server.go

@@ -16,10 +16,6 @@ import (
 	"github.com/Dreamacro/clash/tunnel"
 )
 
-var (
-	tun = tunnel.Instance()
-)
-
 type HttpListener struct {
 	net.Listener
 	address string
@@ -100,9 +96,9 @@ func handleConn(conn net.Conn, cache *cache.Cache) {
 		if err != nil {
 			return
 		}
-		tun.Add(adapters.NewHTTPS(request, conn))
+		tunnel.Add(adapters.NewHTTPS(request, conn))
 		return
 	}
 
-	tun.Add(adapters.NewHTTP(request, conn))
+	tunnel.Add(adapters.NewHTTP(request, conn))
 }

proxy/listener.go

@@ -5,6 +5,7 @@ import (
 	"net"
 	"strconv"
 
+	"github.com/Dreamacro/clash/log"
 	"github.com/Dreamacro/clash/proxy/http"
 	"github.com/Dreamacro/clash/proxy/redir"
 	"github.com/Dreamacro/clash/proxy/socks"
@@ -18,6 +19,7 @@ var (
 	socksUDPListener *socks.SockUDPListener
 	httpListener     *http.HttpListener
 	redirListener    *redir.RedirListener
+	redirUDPListener *redir.RedirUDPListener
 )
 
 type listener interface {
@@ -131,6 +133,14 @@ func ReCreateRedir(port int) error {
 		redirListener = nil
 	}
 
+	if redirUDPListener != nil {
+		if redirUDPListener.Address() == addr {
+			return nil
+		}
+		redirUDPListener.Close()
+		redirUDPListener = nil
+	}
+
 	if portIsZero(addr) {
 		return nil
 	}
@@ -141,6 +151,11 @@ func ReCreateRedir(port int) error {
 		return err
 	}
 
+	redirUDPListener, err = redir.NewRedirUDPProxy(addr)
+	if err != nil {
+		log.Warnln("Failed to start Redir UDP Listener: %s", err)
+	}
+
 	return nil
 }
 

proxy/redir/tcp.go

@@ -9,10 +9,6 @@ import (
 	"github.com/Dreamacro/clash/tunnel"
 )
 
-var (
-	tun = tunnel.Instance()
-)
-
 type RedirListener struct {
 	net.Listener
 	address string
@@ -59,5 +55,5 @@ func handleRedir(conn net.Conn) {
 		return
 	}
 	conn.(*net.TCPConn).SetKeepAlive(true)
-	tun.Add(inbound.NewSocket(target, conn, C.REDIR, C.TCP))
+	tunnel.Add(inbound.NewSocket(target, conn, C.REDIR))
 }

proxy/redir/udp.go

@@ -0,0 +1,74 @@
+package redir
+
+import (
+	"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"
+	"github.com/Dreamacro/clash/tunnel"
+)
+
+type RedirUDPListener struct {
+	net.PacketConn
+	address string
+	closed  bool
+}
+
+func NewRedirUDPProxy(addr string) (*RedirUDPListener, error) {
+	l, err := net.ListenPacket("udp", addr)
+	if err != nil {
+		return nil, err
+	}
+
+	rl := &RedirUDPListener{l, addr, false}
+
+	c := l.(*net.UDPConn)
+
+	err = setsockopt(c, addr)
+	if err != nil {
+		return nil, err
+	}
+
+	go func() {
+		oob := make([]byte, 1024)
+		for {
+			buf := pool.Get(pool.RelayBufferSize)
+			n, oobn, _, lAddr, err := c.ReadMsgUDP(buf, oob)
+			if err != nil {
+				pool.Put(buf)
+				if rl.closed {
+					break
+				}
+				continue
+			}
+
+			rAddr, err := getOrigDst(oob, oobn)
+			if err != nil {
+				continue
+			}
+			handleRedirUDP(l, buf[:n], lAddr, rAddr)
+		}
+	}()
+
+	return rl, nil
+}
+
+func (l *RedirUDPListener) Close() error {
+	l.closed = true
+	return l.PacketConn.Close()
+}
+
+func (l *RedirUDPListener) Address() string {
+	return l.address
+}
+
+func handleRedirUDP(pc net.PacketConn, buf []byte, lAddr *net.UDPAddr, rAddr *net.UDPAddr) {
+	target := socks5.ParseAddrToSocksAddr(rAddr)
+	pkt := &packet{
+		lAddr: lAddr,
+		buf:   buf,
+	}
+	tunnel.AddPacket(adapters.NewPacket(target, pkt, C.REDIR))
+}

proxy/redir/udp_linux.go

@@ -0,0 +1,73 @@
+// +build linux
+
+package redir
+
+import (
+	"encoding/binary"
+	"errors"
+	"net"
+	"syscall"
+)
+
+const (
+	IPV6_TRANSPARENT     = 0x4b
+	IPV6_RECVORIGDSTADDR = 0x4a
+)
+
+func setsockopt(c *net.UDPConn, addr string) error {
+	isIPv6 := true
+	host, _, err := net.SplitHostPort(addr)
+	if err != nil {
+		return err
+	}
+	ip := net.ParseIP(host)
+	if ip != nil && ip.To4() != nil {
+		isIPv6 = false
+	}
+
+	rc, err := c.SyscallConn()
+	if err != nil {
+		return err
+	}
+
+	rc.Control(func(fd uintptr) {
+		err = syscall.SetsockoptInt(int(fd), syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1)
+
+		if err == nil {
+			err = syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_TRANSPARENT, 1)
+		}
+		if err == nil && isIPv6 {
+			err = syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, IPV6_TRANSPARENT, 1)
+		}
+
+		if err == nil {
+			err = syscall.SetsockoptInt(int(fd), syscall.SOL_IP, syscall.IP_RECVORIGDSTADDR, 1)
+		}
+		if err == nil && isIPv6 {
+			err = syscall.SetsockoptInt(int(fd), syscall.SOL_IPV6, IPV6_RECVORIGDSTADDR, 1)
+		}
+	})
+
+	return err
+}
+
+func getOrigDst(oob []byte, oobn int) (*net.UDPAddr, error) {
+	msgs, err := syscall.ParseSocketControlMessage(oob[:oobn])
+	if err != nil {
+		return nil, err
+	}
+
+	for _, msg := range msgs {
+		if msg.Header.Level == syscall.SOL_IP && msg.Header.Type == syscall.IP_RECVORIGDSTADDR {
+			ip := net.IP(msg.Data[4:8])
+			port := binary.BigEndian.Uint16(msg.Data[2:4])
+			return &net.UDPAddr{IP: ip, Port: int(port)}, nil
+		} else if msg.Header.Level == syscall.SOL_IPV6 && msg.Header.Type == IPV6_RECVORIGDSTADDR {
+			ip := net.IP(msg.Data[8:24])
+			port := binary.BigEndian.Uint16(msg.Data[2:4])
+			return &net.UDPAddr{IP: ip, Port: int(port)}, nil
+		}
+	}
+
+	return nil, errors.New("cannot find origDst")
+}

proxy/redir/udp_other.go

@@ -0,0 +1,16 @@
+// +build !linux
+
+package redir
+
+import (
+	"errors"
+	"net"
+)
+
+func setsockopt(c *net.UDPConn, addr string) error {
+	return errors.New("UDP redir not supported on current platform")
+}
+
+func getOrigDst(oob []byte, oobn int) (*net.UDPAddr, error) {
+	return nil, errors.New("UDP redir not supported on current platform")
+}

proxy/redir/utils.go

@@ -0,0 +1,38 @@
+package redir
+
+import (
+	"net"
+
+	"github.com/Dreamacro/clash/common/pool"
+)
+
+type packet struct {
+	lAddr *net.UDPAddr
+	buf   []byte
+}
+
+func (c *packet) Data() []byte {
+	return c.buf
+}
+
+// WriteBack opens a new socket binding `addr` to wirte UDP packet back
+func (c *packet) WriteBack(b []byte, addr net.Addr) (n int, err error) {
+	tc, err := dialUDP("udp", addr.(*net.UDPAddr), c.lAddr)
+	if err != nil {
+		n = 0
+		return
+	}
+	n, err = tc.Write(b)
+	tc.Close()
+	return
+}
+
+// LocalAddr returns the source IP/Port of UDP Packet
+func (c *packet) LocalAddr() net.Addr {
+	return c.lAddr
+}
+
+func (c *packet) Drop() {
+	pool.Put(c.buf)
+	return
+}

proxy/redir/utils_linux.go

@@ -0,0 +1,96 @@
+// +build linux
+
+package redir
+
+import (
+	"fmt"
+	"net"
+	"os"
+	"strconv"
+	"syscall"
+)
+
+// dialUDP acts like net.DialUDP for transparent proxy.
+// It binds to a non-local address(`lAddr`).
+func dialUDP(network string, lAddr *net.UDPAddr, rAddr *net.UDPAddr) (*net.UDPConn, error) {
+	rSockAddr, err := udpAddrToSockAddr(rAddr)
+	if err != nil {
+		return nil, err
+	}
+
+	lSockAddr, err := udpAddrToSockAddr(lAddr)
+	if err != nil {
+		return nil, err
+	}
+
+	fd, err := syscall.Socket(udpAddrFamily(network, lAddr, rAddr), syscall.SOCK_DGRAM, 0)
+	if err != nil {
+		return nil, err
+	}
+
+	if err = syscall.SetsockoptInt(fd, syscall.SOL_SOCKET, syscall.SO_REUSEADDR, 1); err != nil {
+		syscall.Close(fd)
+		return nil, err
+	}
+
+	if err = syscall.SetsockoptInt(fd, syscall.SOL_IP, syscall.IP_TRANSPARENT, 1); err != nil {
+		syscall.Close(fd)
+		return nil, err
+	}
+
+	if err = syscall.Bind(fd, lSockAddr); err != nil {
+		syscall.Close(fd)
+		return nil, err
+	}
+
+	if err = syscall.Connect(fd, rSockAddr); err != nil {
+		syscall.Close(fd)
+		return nil, err
+	}
+
+	fdFile := os.NewFile(uintptr(fd), fmt.Sprintf("net-udp-dial-%s", rAddr.String()))
+	defer fdFile.Close()
+
+	c, err := net.FileConn(fdFile)
+	if err != nil {
+		syscall.Close(fd)
+		return nil, err
+	}
+
+	return c.(*net.UDPConn), nil
+}
+
+func udpAddrToSockAddr(addr *net.UDPAddr) (syscall.Sockaddr, error) {
+	switch {
+	case addr.IP.To4() != nil:
+		ip := [4]byte{}
+		copy(ip[:], addr.IP.To4())
+
+		return &syscall.SockaddrInet4{Addr: ip, Port: addr.Port}, nil
+
+	default:
+		ip := [16]byte{}
+		copy(ip[:], addr.IP.To16())
+
+		zoneID, err := strconv.ParseUint(addr.Zone, 10, 32)
+		if err != nil {
+			zoneID = 0
+		}
+
+		return &syscall.SockaddrInet6{Addr: ip, Port: addr.Port, ZoneId: uint32(zoneID)}, nil
+	}
+}
+
+func udpAddrFamily(net string, lAddr, rAddr *net.UDPAddr) int {
+	switch net[len(net)-1] {
+	case '4':
+		return syscall.AF_INET
+	case '6':
+		return syscall.AF_INET6
+	}
+
+	if (lAddr == nil || lAddr.IP.To4() != nil) && (rAddr == nil || lAddr.IP.To4() != nil) {
+		return syscall.AF_INET
+	}
+	return syscall.AF_INET6
+}

proxy/redir/utils_other.go

@@ -0,0 +1,12 @@
+// +build !linux
+
+package redir
+
+import (
+	"errors"
+	"net"
+)
+
+func dialUDP(network string, lAddr *net.UDPAddr, rAddr *net.UDPAddr) (*net.UDPConn, error) {
+	return nil, errors.New("UDP redir not supported on current platform")
+}

proxy/socks/tcp.go

@@ -13,10 +13,6 @@ import (
 	"github.com/Dreamacro/clash/tunnel"
 )
 
-var (
-	tun = tunnel.Instance()
-)
-
 type SockListener struct {
 	net.Listener
 	address string
@@ -68,5 +64,5 @@ func handleSocks(conn net.Conn) {
 		io.Copy(ioutil.Discard, conn)
 		return
 	}
-	tun.Add(adapters.NewSocket(target, conn, C.SOCKS, C.TCP))
+	tunnel.Add(adapters.NewSocket(target, conn, C.SOCKS))
 }

proxy/socks/udp.go

@@ -5,8 +5,10 @@ import (
 
 	adapters "github.com/Dreamacro/clash/adapters/inbound"
 	"github.com/Dreamacro/clash/common/pool"
+	"github.com/Dreamacro/clash/common/sockopt"
 	"github.com/Dreamacro/clash/component/socks5"
 	C "github.com/Dreamacro/clash/constant"
+	"github.com/Dreamacro/clash/tunnel"
 )
 
 type SockUDPListener struct {
@@ -21,13 +23,18 @@ func NewSocksUDPProxy(addr string) (*SockUDPListener, error) {
 		return nil, err
 	}
 
+	err = sockopt.UDPReuseaddr(l.(*net.UDPConn))
+	if err != nil {
+		return nil, err
+	}
+
 	sl := &SockUDPListener{l, addr, false}
 	go func() {
 		for {
-			buf := pool.BufPool.Get().([]byte)
+			buf := pool.Get(pool.RelayBufferSize)
 			n, remoteAddr, err := l.ReadFrom(buf)
 			if err != nil {
-				pool.BufPool.Put(buf[:cap(buf)])
+				pool.Put(buf)
 				if sl.closed {
 					break
 				}
@@ -53,15 +60,14 @@ 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)])
+		pool.Put(buf)
 		return
 	}
-	packet := &fakeConn{
-		PacketConn: pc,
-		remoteAddr: addr,
-		targetAddr: target,
-		payload:    payload,
-		bufRef:     buf,
+	packet := &packet{
+		pc:      pc,
+		rAddr:   addr,
+		payload: payload,
+		bufRef:  buf,
 	}
-	tun.AddPacket(adapters.NewPacket(target, packet, C.SOCKS, C.UDP))
+	tunnel.AddPacket(adapters.NewPacket(target, packet, C.SOCKS))
 }

proxy/socks/utils.go

@@ -7,39 +7,32 @@ import (
 	"github.com/Dreamacro/clash/component/socks5"
 )
 
-type fakeConn struct {
-	net.PacketConn
-	remoteAddr net.Addr
-	targetAddr socks5.Addr
-	payload    []byte
-	bufRef     []byte
+type packet struct {
+	pc      net.PacketConn
+	rAddr   net.Addr
+	payload []byte
+	bufRef  []byte
 }
 
-func (c *fakeConn) Data() []byte {
+func (c *packet) Data() []byte {
 	return c.payload
 }
 
 // WriteBack wirtes UDP packet with source(ip, port) = `addr`
-func (c *fakeConn) WriteBack(b []byte, addr net.Addr) (n int, err error) {
-	from := c.targetAddr
-	if addr != nil {
-		// if addr is provided, use the parsed addr
-		from = socks5.ParseAddrToSocksAddr(addr)
-	}
-	packet, err := socks5.EncodeUDPPacket(from, b)
+func (c *packet) WriteBack(b []byte, addr net.Addr) (n int, err error) {
+	packet, err := socks5.EncodeUDPPacket(socks5.ParseAddrToSocksAddr(addr), b)
 	if err != nil {
 		return
 	}
-	return c.PacketConn.WriteTo(packet, c.remoteAddr)
+	return c.pc.WriteTo(packet, c.rAddr)
 }
 
 // LocalAddr returns the source IP/Port of UDP Packet
-func (c *fakeConn) LocalAddr() net.Addr {
-	return c.remoteAddr
+func (c *packet) LocalAddr() net.Addr {
+	return c.rAddr
 }
 
-func (c *fakeConn) Close() error {
-	err := c.PacketConn.Close()
-	pool.BufPool.Put(c.bufRef[:cap(c.bufRef)])
-	return err
+func (c *packet) Drop() {
+	pool.Put(c.bufRef)
+	return
 }

rules/geoip.go

@@ -1,17 +1,8 @@
 package rules
 
 import (
-	"sync"
-
+	"github.com/Dreamacro/clash/component/mmdb"
 	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/clash/log"
-
-	"github.com/oschwald/geoip2-golang"
-)
-
-var (
-	mmdb *geoip2.Reader
-	once sync.Once
 )
 
 type GEOIP struct {
@@ -29,7 +20,7 @@ func (g *GEOIP) Match(metadata *C.Metadata) bool {
 	if ip == nil {
 		return false
 	}
-	record, _ := mmdb.Country(ip)
+	record, _ := mmdb.Instance().Country(ip)
 	return record.Country.IsoCode == g.country
 }
 
@@ -46,14 +37,6 @@ func (g *GEOIP) NoResolveIP() bool {
 }
 
 func NewGEOIP(country string, adapter string, noResolveIP bool) *GEOIP {
-	once.Do(func() {
-		var err error
-		mmdb, err = geoip2.Open(C.Path.MMDB())
-		if err != nil {
-			log.Fatalln("Can't load mmdb: %s", err.Error())
-		}
-	})
-
 	geoip := &GEOIP{
 		country:     country,
 		adapter:     adapter,

tunnel/connection.go

@@ -14,12 +14,12 @@ import (
 	"github.com/Dreamacro/clash/common/pool"
 )
 
-func (t *Tunnel) handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
+func handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
 	req := request.R
 	host := req.Host
 
-	inboundReeder := bufio.NewReader(request)
-	outboundReeder := bufio.NewReader(outbound)
+	inboundReader := bufio.NewReader(request)
+	outboundReader := bufio.NewReader(outbound)
 
 	for {
 		keepAlive := strings.TrimSpace(strings.ToLower(req.Header.Get("Proxy-Connection"))) == "keep-alive"
@@ -33,7 +33,7 @@ func (t *Tunnel) handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
 		}
 
 	handleResponse:
-		resp, err := http.ReadResponse(outboundReeder, req)
+		resp, err := http.ReadResponse(outboundReader, req)
 		if err != nil {
 			break
 		}
@@ -61,14 +61,14 @@ func (t *Tunnel) handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
 		}
 
 		// even if resp.Write write body to the connection, but some http request have to Copy to close it
-		buf := pool.BufPool.Get().([]byte)
+		buf := pool.Get(pool.RelayBufferSize)
 		_, err = io.CopyBuffer(request, resp.Body, buf)
-		pool.BufPool.Put(buf[:cap(buf)])
+		pool.Put(buf)
 		if err != nil && err != io.EOF {
 			break
 		}
 
-		req, err = http.ReadRequest(inboundReeder)
+		req, err = http.ReadRequest(inboundReader)
 		if err != nil {
 			break
 		}
@@ -81,38 +81,39 @@ func (t *Tunnel) handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
 	}
 }
 
-func (t *Tunnel) handleUDPToRemote(packet C.UDPPacket, pc net.PacketConn, addr net.Addr) {
-	if _, err := pc.WriteTo(packet.Data(), addr); err != nil {
+func handleUDPToRemote(packet C.UDPPacket, pc C.PacketConn, metadata *C.Metadata) {
+	defer packet.Drop()
+
+	if _, err := pc.WriteWithMetadata(packet.Data(), metadata); err != nil {
 		return
 	}
-	DefaultManager.Upload() <- int64(len(packet.Data()))
 }
 
-func (t *Tunnel) handleUDPToLocal(packet C.UDPPacket, pc net.PacketConn, key string, omitSrcAddr bool, timeout time.Duration) {
-	buf := pool.BufPool.Get().([]byte)
-	defer pool.BufPool.Put(buf[:cap(buf)])
-	defer t.natTable.Delete(key)
+func handleUDPToLocal(packet C.UDPPacket, pc net.PacketConn, key string, fAddr net.Addr) {
+	buf := pool.Get(pool.RelayBufferSize)
+	defer pool.Put(buf)
+	defer natTable.Delete(key)
 	defer pc.Close()
 
 	for {
-		pc.SetReadDeadline(time.Now().Add(timeout))
+		pc.SetReadDeadline(time.Now().Add(udpTimeout))
 		n, from, err := pc.ReadFrom(buf)
 		if err != nil {
 			return
 		}
-		if from != nil && omitSrcAddr {
-			from = nil
+
+		if fAddr != nil {
+			from = fAddr
 		}
 
 		n, err = packet.WriteBack(buf[:n], from)
 		if err != nil {
 			return
 		}
-		DefaultManager.Download() <- int64(n)
 	}
 }
 
-func (t *Tunnel) handleSocket(request *adapters.SocketAdapter, outbound net.Conn) {
+func handleSocket(request *adapters.SocketAdapter, outbound net.Conn) {
 	relay(request, outbound)
 }
 
@@ -121,16 +122,16 @@ func relay(leftConn, rightConn net.Conn) {
 	ch := make(chan error)
 
 	go func() {
-		buf := pool.BufPool.Get().([]byte)
+		buf := pool.Get(pool.RelayBufferSize)
 		_, err := io.CopyBuffer(leftConn, rightConn, buf)
-		pool.BufPool.Put(buf[:cap(buf)])
+		pool.Put(buf)
 		leftConn.SetReadDeadline(time.Now())
 		ch <- err
 	}()
 
-	buf := pool.BufPool.Get().([]byte)
+	buf := pool.Get(pool.RelayBufferSize)
 	io.CopyBuffer(rightConn, leftConn, buf)
-	pool.BufPool.Put(buf[:cap(buf)])
+	pool.Put(buf)
 	rightConn.SetReadDeadline(time.Now())
 	<-ch
 }

tunnel/manager.go

@@ -61,6 +61,15 @@ func (m *Manager) Snapshot() *Snapshot {
 	}
 }
 
+func (m *Manager) ResetStatistic() {
+	m.uploadTemp = 0
+	m.uploadBlip = 0
+	m.uploadTotal = 0
+	m.downloadTemp = 0
+	m.downloadBlip = 0
+	m.downloadTotal = 0
+}
+
 func (m *Manager) handle() {
 	go m.handleCh(m.upload, &m.uploadTemp, &m.uploadBlip, &m.uploadTotal)
 	go m.handleCh(m.download, &m.downloadTemp, &m.downloadBlip, &m.downloadTotal)