Chore: update dependencies and README.md

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

.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

README.md

@@ -19,23 +19,25 @@
 
 ## Features
 
-- Local HTTP/HTTPS/SOCKS server
+- Local HTTP/HTTPS/SOCKS server with/without authentication
-- GeoIP rule support
+- VMess, Shadowsocks, Trojan (experimental), Snell protocol support for remote connections. UDP is supported.
-- Supports Vmess, Shadowsocks, Snell and SOCKS5 protocol
+- Built-in DNS server that aims to minimize DNS pollution attacks, supports DoH/DoT upstream. Fake IP is also supported.
-- Supports Netfilter TCP redirecting
+- Rules based off domains, GEOIP, IP CIDR or ports to forward packets to different nodes
-- Comprehensive HTTP API
+- 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 TUN mode binaries are available here: [TUN release](https://github.com/Dreamacro/clash/releases/tag/TUN). Source is not currently available.
-Pre-built TUN mode binaries are available here: [TUN release](https://github.com/Dreamacro/clash/releases/tag/TUN)
 
 Check Clash version with:
 
@@ -43,21 +45,17 @@ Check Clash version with:
 $ clash -v
 ```
 
-## Daemon
+## Daemonize Clash
 
-Unfortunately, there is no native and elegant way to implement daemons on Golang.
+Unfortunately, there is no native or elegant way to implement daemons on Golang. We recommend using third-party daemon management tools like PM2, Supervisor or the like to keep Clash running as a service.
 
-So we can use third-party daemon tools like PM2, Supervisor or the like.
+In the case of [pm2](https://github.com/Unitech/pm2), start the daemon this way:
-
-In the case of [pm2](https://github.com/Unitech/pm2), we can start the daemon this way:
 
 ```sh
 $ pm2 start clash
 ```
 
-If you have Docker installed, you can run clash directly using `docker-compose`.
+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)
-
-[Run clash in docker](https://github.com/Dreamacro/clash/wiki/Run-clash-in-docker)
 
 ## Config
 
@@ -122,9 +120,10 @@ 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:
@@ -150,7 +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
@@ -212,6 +211,24 @@ Proxy:
     # 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"
     type: socks5
@@ -243,7 +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
@@ -284,7 +324,33 @@ Proxy Group:
       - vmess1
       - auto
   
-Rule:
+  - name: UseProvider
+    type: select
+    use:
+      - provider1
+    proxies:
+      - Proxy
+      - DIRECT
+
+proxy-providers:
+  provider1:
+    type: http
+    url: "url"
+    interval: 3600
+    path: ./hk.yaml
+    health-check:
+      enable: true
+      interval: 600
+      url: http://www.gstatic.com/generate_204
+  test:
+    type: file
+    path: /test.yaml
+    health-check:
+      enable: true
+      interval: 36000
+      url: http://www.gstatic.com/generate_204
+
+rules:
   - DOMAIN-SUFFIX,google.com,auto
   - DOMAIN-KEYWORD,google,auto
   - DOMAIN,google.com,auto
@@ -308,7 +374,7 @@ Rule:
 ## Documentations
 https://clash.gitbook.io/
 
-## Thanks
+## Credits
 
 [riobard/go-shadowsocks2](https://github.com/riobard/go-shadowsocks2)
 

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
 }
@@ -30,6 +31,10 @@ func (b *Base) Type() C.AdapterType {
 	return b.tp
 }
 
+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")
 }
@@ -44,8 +49,16 @@ func (b *Base) MarshalJSON() ([]byte, error) {
 	})
 }
 
-func NewBase(name string, tp C.AdapterType, udp bool) *Base {
+func (b *Base) Addr() string {
-	return &Base{name, tp, udp}
+	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 {
@@ -61,7 +74,7 @@ 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()}}
 }
 
@@ -194,7 +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

@@ -14,17 +14,14 @@ type Direct struct {
 }
 
 func (d *Direct) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
-	address := net.JoinHostPort(metadata.Host, metadata.DstPort)
+	address := net.JoinHostPort(metadata.String(), metadata.DstPort)
-	if metadata.DstIP != nil {
-		address = net.JoinHostPort(metadata.DstIP.String(), metadata.DstPort)
-	}
 
 	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, error) {

adapters/outbound/http.go

@@ -19,7 +19,6 @@ import (
 
 type Http struct {
 	*Base
-	addr      string
 	user      string
 	pass      string
 	tlsConfig *tls.Config
@@ -35,23 +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) {
+func (h *Http) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
-	c, err := dialer.DialContext(ctx, "tcp", h.addr)
+	if h.tlsConfig != nil {
-	if err == nil && 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 {
@@ -113,9 +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

@@ -15,7 +15,7 @@ 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) {

adapters/outbound/shadowsocks.go

@@ -2,8 +2,8 @@ package outbound
 
 import (
 	"context"
-	"crypto/tls"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"net"
 	"strconv"
@@ -20,7 +20,6 @@ import (
 
 type ShadowSocks struct {
 	*Base
-	server string
 	cipher core.Cipher
 
 	// obfs
@@ -59,28 +58,34 @@ type v2rayObfsOption struct {
 	Mux            bool              `obfs:"mux,omitempty"`
 }
 
-func (ss *ShadowSocks) DialContext(ctx context.Context, metadata *C.Metadata) (C.Conn, error) {
+func (ss *ShadowSocks) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
-	c, err := dialer.DialContext(ctx, "tcp", ss.server)
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error: %w", ss.server, err)
-	}
-	tcpKeepAlive(c)
 	switch ss.obfsMode {
 	case "tls":
 		c = obfs.NewTLSObfs(c, ss.obfsOption.Host)
 	case "http":
-		_, port, _ := net.SplitHostPort(ss.server)
+		_, 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))
+	_, err := c.Write(serializesSocksAddr(metadata))
-	return newConn(c, ss), err
+	return c, err
+}
+
+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, 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) {
@@ -89,7 +94,7 @@ func (ss *ShadowSocks) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
 		return nil, err
 	}
 
-	addr, err := resolveUDPAddr("udp", ss.server)
+	addr, err := resolveUDPAddr("udp", ss.addr)
 	if err != nil {
 		return nil, err
 	}
@@ -105,12 +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
@@ -132,49 +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,
 		}
+
+		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,
@@ -209,7 +210,17 @@ func (spc *ssPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
 	if e != nil {
 		return 0, nil, e
 	}
+
 	addr := socks5.SplitAddr(b[:n])
-	copy(b, b[len(addr):])
+	if addr == nil {
-	return n - len(addr), addr.UDPAddr(), e
+		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

@@ -15,7 +15,6 @@ import (
 
 type Snell struct {
 	*Base
-	server     string
 	psk        []byte
 	obfsOption *simpleObfsOption
 }
@@ -28,45 +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) {
+func (s *Snell) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
-	c, err := dialer.DialContext(ctx, "tcp", s.server)
-	if err != nil {
-		return nil, fmt.Errorf("%s connect error: %w", s.server, err)
-	}
-	tcpKeepAlive(c)
 	switch s.obfsOption.Mode {
 	case "tls":
 		c = obfs.NewTLSObfs(c, s.obfsOption.Host)
 	case "http":
-		_, port, _ := net.SplitHostPort(s.server)
+		_, 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))
+	err := snell.WriteHeader(c, metadata.String(), uint(port))
-	return newConn(c, s), err
+	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

@@ -3,6 +3,7 @@ package outbound
 import (
 	"context"
 	"crypto/tls"
+	"errors"
 	"fmt"
 	"io"
 	"io/ioutil"
@@ -16,7 +17,6 @@ import (
 
 type Socks5 struct {
 	*Base
-	addr           string
 	user           string
 	pass           string
 	tls            bool
@@ -35,19 +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) {
+func (ss *Socks5) StreamConn(c net.Conn, metadata *C.Metadata) (net.Conn, error) {
-	c, err := dialer.DialContext(ctx, "tcp", ss.addr)
+	if ss.tls {
-
-	if err == nil && 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)
 		}
-	tcpKeepAlive(c)
+	}
+
 	var user *socks5.User
 	if ss.user != "" {
 		user = &socks5.User{
@@ -58,7 +55,22 @@ 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) 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) {
@@ -126,10 +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,
@@ -161,7 +173,7 @@ func (uc *socksPacketConn) WriteWithMetadata(p []byte, metadata *C.Metadata) (n
 }
 
 func (uc *socksPacketConn) ReadFrom(b []byte) (int, net.Addr, error) {
-	n, a, e := uc.PacketConn.ReadFrom(b)
+	n, _, e := uc.PacketConn.ReadFrom(b)
 	if e != nil {
 		return 0, nil, e
 	}
@@ -169,10 +181,15 @@ func (uc *socksPacketConn) 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 *socksPacketConn) Close() error {

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/vmess.go

@@ -5,6 +5,7 @@ import (
 	"errors"
 	"fmt"
 	"net"
+	"net/http"
 	"strconv"
 	"strings"
 
@@ -16,8 +17,8 @@ import (
 
 type Vmess struct {
 	*Base
-	server string
 	client *vmess.Client
+	option *VmessOption
 }
 
 type VmessOption struct {
@@ -30,19 +31,82 @@ 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) {
+type HTTPOptions struct {
-	c, err := dialer.DialContext(ctx, "tcp", v.server)
+	Method  string              `proxy:"method,omitempty"`
+	Path    []string            `proxy:"path,omitempty"`
+	Headers map[string][]string `proxy:"headers,omitempty"`
+}
+
+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, 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))
+
-	return newConn(c, v), err
+	c, err = v.StreamConn(c, metadata)
+	return NewConn(c, v), err
 }
 
 func (v *Vmess) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
@@ -57,12 +121,12 @@ func (v *Vmess) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
 
 	ctx, cancel := context.WithTimeout(context.Background(), tcpTimeout)
 	defer cancel()
-	c, err := dialer.DialContext(ctx, "tcp", v.server)
+	c, err := dialer.DialContext(ctx, "tcp", v.addr)
 	if err != nil {
-		return nil, fmt.Errorf("%s connect error", v.server)
+		return nil, fmt.Errorf("%s connect error", v.addr)
 	}
 	tcpKeepAlive(c)
-	c, err = v.client.New(c, parseVmessAddr(metadata))
+	c, err = v.StreamConn(c, metadata)
 	if err != nil {
 		return nil, fmt.Errorf("new vmess client error: %v", err)
 	}
@@ -75,14 +139,8 @@ func NewVmess(option VmessOption) (*Vmess, error) {
 		UUID:     option.UUID,
 		AlterID:  uint16(option.AlterID),
 		Security: security,
-		TLS:              option.TLS,
 		HostName: option.Server,
 		Port:     strconv.Itoa(option.Port),
-		NetWork:          option.Network,
-		WebSocketPath:    option.WSPath,
-		WebSocketHeaders: option.WSHeaders,
-		SkipCertVerify:   option.SkipCertVerify,
-		SessionCache:     getClientSessionCache(),
 	})
 	if err != nil {
 		return nil, err
@@ -91,11 +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
 }
 

adapters/outboundgroup/fallback.go

@@ -56,6 +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
@@ -77,7 +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

@@ -59,20 +59,11 @@ func (lb *LoadBalance) DialContext(ctx context.Context, metadata *C.Metadata) (c
 		}
 	}()
 
-	key := uint64(murmur3.Sum32([]byte(getKey(metadata))))
+	proxy := lb.Unwrap(metadata)
-	proxies := lb.proxies()
+
-	buckets := int32(len(proxies))
-	for i := 0; i < lb.maxRetry; i, key = i+1, key+1 {
-		idx := jumpHash(key, buckets)
-		proxy := proxies[idx]
-		if proxy.Alive() {
 	c, err = proxy.DialContext(ctx, metadata)
 	return
 }
-	}
-	c, err = proxies[0].DialContext(ctx, metadata)
-	return
-}
 
 func (lb *LoadBalance) DialUDP(metadata *C.Metadata) (pc C.PacketConn, err error) {
 	defer func() {
@@ -81,6 +72,16 @@ func (lb *LoadBalance) DialUDP(metadata *C.Metadata) (pc C.PacketConn, err error
 		}
 	}()
 
+	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, err error
 		idx := jumpHash(key, buckets)
 		proxy := proxies[idx]
 		if proxy.Alive() {
-			return proxy.DialUDP(metadata)
+			return proxy
 		}
 	}
 
-	return proxies[0].DialUDP(metadata)
+	return proxies[0]
-}
-
-func (lb *LoadBalance) SupportUDP() bool {
-	return true
 }
 
 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

@@ -64,7 +64,7 @@ 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.NewCompatibleProvider(groupName, ps, hc)
 				if err != nil {
@@ -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

@@ -14,12 +14,12 @@ 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)
 	}
@@ -27,7 +27,7 @@ func (s *Selector) DialContext(ctx context.Context, metadata *C.Metadata) (C.Con
 }
 
 func (s *Selector) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
-	pc, err := s.selected.DialUDP(metadata)
+	pc, err := s.selectedProxy().DialUDP(metadata)
 	if err == nil {
 		pc.AppendToChains(s)
 	}
@@ -35,12 +35,12 @@ func (s *Selector) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
 }
 
 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())
 	}
 
@@ -52,13 +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
 		}
 	}
@@ -66,18 +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

@@ -38,6 +38,10 @@ func (u *URLTest) DialUDP(metadata *C.Metadata) (C.PacketConn, error) {
 	return pc, err
 }
 
+func (u *URLTest) Unwrap(metadata *C.Metadata) C.Proxy {
+	return u.fast()
+}
+
 func (u *URLTest) proxies() []C.Proxy {
 	elm, _, _ := u.single.Do(func() (interface{}, error) {
 		return getProvidersProxies(u.providers), nil
@@ -86,7 +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/provider.go

@@ -1,26 +1,20 @@
 package provider
 
 import (
-	"bytes"
-	"crypto/md5"
 	"encoding/json"
 	"errors"
 	"fmt"
-	"io/ioutil"
+	"runtime"
-	"os"
 	"time"
 
 	"github.com/Dreamacro/clash/adapters/outbound"
 	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/clash/log"
 
 	"gopkg.in/yaml.v2"
 )
 
 const (
 	ReservedName = "default"
-
-	fileMode = 0666
 )
 
 // Provider Type
@@ -49,8 +43,7 @@ type Provider interface {
 	VehicleType() VehicleType
 	Type() ProviderType
 	Initial() error
-	Reload() error
+	Update() error
-	Destroy() 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
+	*proxySetProvider
-	vehicle     Vehicle
-	hash        [16]byte
-	proxies     []C.Proxy
-	healthCheck *HealthCheck
-	ticker      *time.Ticker
-	updatedAt   *time.Time
 }
 
-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(),
@@ -85,123 +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 {
+func (pp *proxySetProvider) HealthCheck() {
-	return nil
-}
-
-func (pp *ProxySetProvider) HealthCheck() {
 	pp.healthCheck.check()
 }
 
-func (pp *ProxySetProvider) Update() error {
+func (pp *proxySetProvider) Update() error {
-	return pp.pull()
+	elm, same, err := pp.fetcher.Update()
+	if err == nil && !same {
+		pp.onUpdate(elm)
+	}
+	return err
 }
 
-func (pp *ProxySetProvider) Destroy() error {
+func (pp *proxySetProvider) Initial() error {
-	pp.healthCheck.close()
+	elm, err := pp.fetcher.Initial()
-
+	if err != nil {
-	if pp.ticker != nil {
+		return err
-		pp.ticker.Stop()
 	}
 
+	pp.onUpdate(elm)
 	return nil
 }
 
-func (pp *ProxySetProvider) Initial() error {
+func (pp *proxySetProvider) Type() ProviderType {
-	var buf []byte
-	var err error
-	if stat, err := os.Stat(pp.vehicle.Path()); err == nil {
-		buf, err = ioutil.ReadFile(pp.vehicle.Path())
-		modTime := stat.ModTime()
-		pp.updatedAt = &modTime
-	} else {
-		buf, err = pp.vehicle.Read()
-	}
-
-	if err != nil {
-		return err
-	}
-
-	proxies, err := pp.parse(buf)
-	if err != nil {
-		// parse local file error, fallback to remote
-		buf, err = pp.vehicle.Read()
-		if err != nil {
-			return err
-		}
-	}
-
-	if err := ioutil.WriteFile(pp.vehicle.Path(), buf, fileMode); err != nil {
-		return err
-	}
-
-	pp.hash = md5.Sum(buf)
-	pp.setProxies(proxies)
-
-	// pull proxies automatically
-	if pp.ticker != nil {
-		go pp.pullLoop()
-	}
-
-	return nil
-}
-
-func (pp *ProxySetProvider) VehicleType() VehicleType {
-	return pp.vehicle.Type()
-}
-
-func (pp *ProxySetProvider) Type() ProviderType {
 	return Proxy
 }
 
-func (pp *ProxySetProvider) Proxies() []C.Proxy {
+func (pp *proxySetProvider) Proxies() []C.Proxy {
 	return pp.proxies
 }
 
-func (pp *ProxySetProvider) pullLoop() {
+func proxiesParse(buf []byte) (interface{}, error) {
-	for range pp.ticker.C {
-		if err := pp.pull(); err != nil {
-			log.Warnln("[Provider] %s pull error: %s", pp.Name(), err.Error())
-		}
-	}
-}
-
-func (pp *ProxySetProvider) pull() error {
-	buf, err := pp.vehicle.Read()
-	if err != nil {
-		return err
-	}
-
-	now := time.Now()
-	hash := md5.Sum(buf)
-	if bytes.Equal(pp.hash[:], hash[:]) {
-		log.Debugln("[Provider] %s's proxies doesn't change", pp.Name())
-		pp.updatedAt = &now
-		return nil
-	}
-
-	proxies, err := pp.parse(buf)
-	if err != nil {
-		return err
-	}
-	log.Infoln("[Provider] %s's proxies update", pp.Name())
-
-	if err := ioutil.WriteFile(pp.vehicle.Path(), buf, fileMode); err != nil {
-		return err
-	}
-
-	pp.updatedAt = &now
-	pp.hash = hash
-	pp.setProxies(proxies)
-
-	return nil
-}
-
-func (pp *ProxySetProvider) parse(buf []byte) ([]C.Proxy, error) {
 	schema := &ProxySchema{}
 
 	if err := yaml.Unmarshal(buf, schema); err != nil {
@@ -228,38 +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 {
+func stopProxyProvider(pd *ProxySetProvider) {
-	var ticker *time.Ticker
+	pd.healthCheck.close()
-	if interval != 0 {
+	pd.fetcher.Destroy()
-		ticker = time.NewTicker(interval)
 }
 
+func NewProxySetProvider(name string, interval time.Duration, vehicle Vehicle, hc *HealthCheck) *ProxySetProvider {
 	if hc.auto() {
 		go hc.process()
 	}
 
-	return &ProxySetProvider{
+	pd := &proxySetProvider{
-		name:        name,
-		vehicle:     vehicle,
 		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
+}
+
+// for auto gc
 type CompatibleProvider struct {
+	*compatibleProvider
+}
+
+type compatibleProvider struct {
 	name        string
 	healthCheck *HealthCheck
 	proxies     []C.Proxy
 }
 
-func (cp *CompatibleProvider) MarshalJSON() ([]byte, error) {
+func (cp *compatibleProvider) MarshalJSON() ([]byte, error) {
 	return json.Marshal(map[string]interface{}{
 		"name":        cp.Name(),
 		"type":        cp.Type().String(),
@@ -268,43 +193,38 @@ func (cp *CompatibleProvider) MarshalJSON() ([]byte, error) {
 	})
 }
 
-func (cp *CompatibleProvider) Name() string {
+func (cp *compatibleProvider) Name() string {
 	return cp.name
 }
 
-func (cp *CompatibleProvider) Reload() error {
+func (cp *compatibleProvider) HealthCheck() {
-	return nil
-}
-
-func (cp *CompatibleProvider) Destroy() error {
-	cp.healthCheck.close()
-	return nil
-}
-
-func (cp *CompatibleProvider) HealthCheck() {
 	cp.healthCheck.check()
 }
 
-func (cp *CompatibleProvider) Update() error {
+func (cp *compatibleProvider) Update() error {
 	return nil
 }
 
-func (cp *CompatibleProvider) Initial() error {
+func (cp *compatibleProvider) Initial() error {
 	return nil
 }
 
-func (cp *CompatibleProvider) VehicleType() VehicleType {
+func (cp *compatibleProvider) VehicleType() VehicleType {
 	return Compatible
 }
 
-func (cp *CompatibleProvider) Type() ProviderType {
+func (cp *compatibleProvider) Type() ProviderType {
 	return Proxy
 }
 
-func (cp *CompatibleProvider) Proxies() []C.Proxy {
+func (cp *compatibleProvider) Proxies() []C.Proxy {
 	return cp.proxies
 }
 
+func stopCompatibleProvider(pd *CompatibleProvider) {
+	pd.healthCheck.close()
+}
+
 func NewCompatibleProvider(name string, proxies []C.Proxy, hc *HealthCheck) (*CompatibleProvider, error) {
 	if len(proxies) == 0 {
 		return nil, errors.New("Provider need one proxy at least")
@@ -314,9 +234,13 @@ func NewCompatibleProvider(name string, proxies []C.Proxy, hc *HealthCheck) (*Co
 		go hc.process()
 	}
 
-	return &CompatibleProvider{
+	pd := &compatibleProvider{
 		name:        name,
 		proxies:     proxies,
 		healthCheck: hc,
-	}, nil
+	}
+
+	wrapper := &CompatibleProvider{pd}
+	runtime.SetFinalizer(wrapper, stopCompatibleProvider)
+	return wrapper, nil
 }

adapters/provider/vehicle.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"io/ioutil"
 	"net/http"
+	"net/url"
 	"time"
 
 	"github.com/Dreamacro/clash/component/dialer"
@@ -75,10 +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{

common/cache/lrucache.go

@@ -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()
+	entry := c.get(key)
-	defer c.mu.Unlock()
+	if entry == nil {
-
-	le, ok := c.cache[key]
-	if !ok {
 		return nil, false
 	}
-
-	if c.maxAge > 0 && le.Value.(*entry).expires <= time.Now().Unix() {
-		c.deleteElement(le)
-		c.maybeDeleteOldest()
-
-		return nil, false
-	}
-
-	c.lru.MoveToBack(le)
-	entry := le.Value.(*entry)
-	if c.maxAge > 0 && c.updateAgeOnGet {
-		entry.expires = time.Now().Unix() + c.maxAge
-	}
 	value := entry.value
 
 	return value, true
 }
 
+// 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

@@ -16,7 +16,9 @@ type Picker struct {
 	wg sync.WaitGroup
 
 	once    sync.Once
+	errOnce sync.Once
 	result  interface{}
+	err     error
 }
 
 func newPicker(ctx context.Context, cancel func()) *Picker {
@@ -49,6 +51,11 @@ func (p *Picker) Wait() interface{} {
 	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.
 // The first call to return a nil error cancels the group; its result will be returned by Wait.
 func (p *Picker) Go(f func() (interface{}, error)) {
@@ -64,6 +71,10 @@ func (p *Picker) Go(f func() (interface{}, error)) {
 					p.cancel()
 				}
 			})
+		} else {
+			p.errOnce.Do(func() {
+				p.err = err
+			})
 		}
 	}()
 }

common/picker/picker_test.go

@@ -36,4 +36,5 @@ func TestPicker_Timeout(t *testing.T) {
 
 	number := picker.Wait()
 	assert.Nil(t, number)
+	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
+func Get(size int) []byte {
-var BufPool = sync.Pool{New: func() interface{} { return make([]byte, bufferSize) }}
+	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

@@ -8,22 +8,26 @@ import (
 	"github.com/Dreamacro/clash/component/resolver"
 )
 
-func Dialer() *net.Dialer {
+func Dialer() (*net.Dialer, error) {
 	dialer := &net.Dialer{}
 	if DialerHook != nil {
-		DialerHook(dialer)
+		if err := DialerHook(dialer); err != nil {
+			return nil, err
+		}
 	}
 
-	return dialer
+	return dialer, nil
 }
 
-func ListenConfig() *net.ListenConfig {
+func ListenConfig() (*net.ListenConfig, error) {
 	cfg := &net.ListenConfig{}
 	if ListenConfigHook != nil {
-		ListenConfigHook(cfg)
+		if err := ListenConfigHook(cfg); err != nil {
+			return nil, err
+		}
 	}
 
-	return cfg
+	return cfg, nil
 }
 
 func Dial(network, address string) (net.Conn, error) {
@@ -38,7 +42,10 @@ func DialContext(ctx context.Context, network, address string) (net.Conn, error)
 			return nil, err
 		}
 
-		dialer := Dialer()
+		dialer, err := Dialer()
+		if err != nil {
+			return nil, err
+		}
 
 		var ip net.IP
 		switch network {
@@ -53,7 +60,9 @@ func DialContext(ctx context.Context, network, address string) (net.Conn, error)
 		}
 
 		if DialHook != nil {
-			DialHook(dialer, network, ip)
+			if err := DialHook(dialer, network, ip); err != nil {
+				return nil, err
+			}
 		}
 		return dialer.DialContext(ctx, network, net.JoinHostPort(ip.String(), port))
 	case "tcp", "udp":
@@ -64,13 +73,17 @@ func DialContext(ctx context.Context, network, address string) (net.Conn, error)
 }
 
 func ListenPacket(network, address string) (net.PacketConn, error) {
-	lc := ListenConfig()
+	lc, err := ListenConfig()
+	if err != nil {
+		return nil, err
+	}
 
 	if ListenPacketHook != nil && address == "" {
-		ip := ListenPacketHook()
+		ip, err := ListenPacketHook()
-		if ip != nil {
+		if err != nil {
-			address = net.JoinHostPort(ip.String(), "0")
+			return nil, err
 		}
+		address = net.JoinHostPort(ip.String(), "0")
 	}
 	return lc.ListenPacket(context.Background(), network, address)
 }
@@ -95,7 +108,6 @@ func dualStackDailContext(ctx context.Context, network, address string) (net.Con
 	var primary, fallback dialResult
 
 	startRacer := func(ctx context.Context, network, host string, ipv6 bool) {
-		dialer := Dialer()
 		result := dialResult{ipv6: ipv6, done: true}
 		defer func() {
 			select {
@@ -107,6 +119,12 @@ func dualStackDailContext(ctx context.Context, network, address string) (net.Con
 			}
 		}()
 
+		dialer, err := Dialer()
+		if err != nil {
+			result.error = err
+			return
+		}
+
 		var ip net.IP
 		if ipv6 {
 			ip, result.error = resolver.ResolveIPv6(host)
@@ -119,7 +137,9 @@ func dualStackDailContext(ctx context.Context, network, address string) (net.Con
 		result.resolved = true
 
 		if DialHook != nil {
-			DialHook(dialer, network, ip)
+			if result.error = DialHook(dialer, network, ip); result.error != nil {
+				return
+			}
 		}
 		result.Conn, result.error = dialer.DialContext(ctx, network, net.JoinHostPort(ip.String(), port))
 	}

component/dialer/hook.go

@@ -8,10 +8,10 @@ import (
 	"github.com/Dreamacro/clash/common/singledo"
 )
 
-type DialerHookFunc = func(dialer *net.Dialer)
+type DialerHookFunc = func(dialer *net.Dialer) error
-type DialHookFunc = func(dialer *net.Dialer, network string, ip net.IP)
+type DialHookFunc = func(dialer *net.Dialer, network string, ip net.IP) error
-type ListenConfigHookFunc = func(*net.ListenConfig)
+type ListenConfigHookFunc = func(*net.ListenConfig) error
-type ListenPacketHookFunc = func() net.IP
+type ListenPacketHookFunc = func() (net.IP, error)
 
 var (
 	DialerHook       DialerHookFunc
@@ -70,7 +70,7 @@ func lookupUDPAddr(ip net.IP, addrs []net.Addr) (*net.UDPAddr, error) {
 func ListenPacketWithInterface(name string) ListenPacketHookFunc {
 	single := singledo.NewSingle(5 * time.Second)
 
-	return func() net.IP {
+	return func() (net.IP, error) {
 		elm, err, _ := single.Do(func() (interface{}, error) {
 			iface, err := net.InterfaceByName(name)
 			if err != nil {
@@ -86,7 +86,7 @@ func ListenPacketWithInterface(name string) ListenPacketHookFunc {
 		})
 
 		if err != nil {
-			return nil
+			return nil, err
 		}
 
 		addrs := elm.([]net.Addr)
@@ -97,17 +97,17 @@ func ListenPacketWithInterface(name string) ListenPacketHookFunc {
 				continue
 			}
 
-			return addr.IP
+			return addr.IP, nil
 		}
 
-		return 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) {
+	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 {
@@ -123,7 +123,7 @@ func DialerWithInterface(name string) DialHookFunc {
 		})
 
 		if err != nil {
-			return
+			return err
 		}
 
 		addrs := elm.([]net.Addr)
@@ -132,11 +132,17 @@ func DialerWithInterface(name string) DialHookFunc {
 		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

@@ -7,6 +7,7 @@ import (
 
 const (
 	wildcard    = "*"
+	dotWildcard = ""
 	domainStep  = "."
 )
 
@@ -21,8 +22,23 @@ type Trie struct {
 	root *Node
 }
 
-func isValidDomain(domain string) bool {
+func validAndSplitDomain(domain string) ([]string, bool) {
-	return domain != "" && domain[0] != '.' && domain[len(domain)-1] != '.'
+	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 node := n.getChild(dotWildcard); node != nil {
-		if !n.hasChild(part) {
+			dotWildcardNode = node
-			if !n.hasChild(wildcard) {
-				return nil
 		}
 
-			child = n.getChild(wildcard)
+		child := n.getChild(part)
-		} else {
+		if child == nil && wildcardNode != nil {
-			child = n.getChild(part)
+			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 {
+	assert.NotNil(t, node)
-		t.Error("should not recv nil")
+	assert.True(t, node.Data.(net.IP).Equal(localIP))
-	}
+	assert.NotNil(t, tree.Insert("", localIP))
-
-	if !node.Data.(net.IP).Equal(localIP) {
-		t.Error("should equal 127.0.0.1")
-	}
-
-	if tree.Insert("", localIP) == nil {
-		t.Error("should return error")
-	}
 }
 
 func TestTrie_Wildcard(t *testing.T) {
@@ -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 {
+	assert.NotNil(t, tree.Search("sub.example.com"))
-		t.Error("should not recv nil")
+	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"))
 }
 
-	if tree.Search("sub.foo.example.com") == nil {
+func TestTrie_Priority(t *testing.T) {
-		t.Error("should not recv nil")
+	tree := New()
+	domains := []string{
+		".dev",
+		"example.dev",
+		"*.example.dev",
+		"test.example.dev",
 	}
 
-	if tree.Search("foo.sub.example.com") != nil {
+	assertFn := func(domain string, data int) {
-		t.Error("should recv nil")
+		node := tree.Search(domain)
+		assert.NotNil(t, node)
+		assert.Equal(t, data, node.Data)
 	}
 
-	if tree.Search("foo.example.dev") != nil {
+	for idx, domain := range domains {
-		t.Error("should recv nil")
+		tree.Insert(domain, idx)
 	}
 
-	if tree.Search("example.com") != nil {
+	assertFn("test.dev", 0)
-		t.Error("should recv nil")
+	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 {
+	assert.NotNil(t, tree.Insert(".", localIP))
-		t.Error("should recv err")
+	assert.NotNil(t, tree.Insert("..dev", localIP))
-	}
+	assert.Nil(t, tree.Search("dev"))
-
-	if err := tree.Insert(".com", localIP); err == nil {
-		t.Error("should recv err")
-	}
-
-	if tree.Search("dev") != nil {
-		t.Error("should recv nil")
-	}
-
-	if tree.Search(".dev") != nil {
-		t.Error("should recv nil")
-	}
 }

component/mmdb/mmdb.go

@@ -22,6 +22,14 @@ func LoadFromBytes(buffer []byte) {
 	})
 }
 
+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

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)
+	buf := pool.Get(discardN)
-	_, err := io.ReadFull(to.Conn, buf[: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

@@ -11,9 +11,12 @@ import (
 // Option is options of websocket obfs
 type Option struct {
 	Host           string
+	Port           string
 	Path           string
 	Headers        map[string]string
-	TLSConfig *tls.Config
+	TLS            bool
+	SkipCertVerify bool
+	SessionCache   tls.ClientSessionCache
 	Mux            bool
 }
 
@@ -26,14 +29,16 @@ func NewV2rayObfs(conn net.Conn, option *Option) (net.Conn, error) {
 
 	config := &vmess.WebsocketConfig{
 		Host:           option.Host,
+		Port:           option.Port,
 		Path:           option.Path,
-		TLS:       option.TLSConfig != nil,
+		TLS:            option.TLS,
 		Headers:        header,
-		TLSConfig: option.TLSConfig,
+		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)
+	buf := pool.Get(pool.RelayBufferSize)
-	defer pool.BufPool.Put(buf[:cap(buf)])
+	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)
+	buf := pool.Get(size)
-	_, err = io.ReadFull(cr.Reader, buf[: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)
+	buf := pool.Get(pool.RelayBufferSize)
-	defer pool.BufPool.Put(buf[:cap(buf)])
+	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"
 
@@ -69,10 +68,6 @@ type Client struct {
 	user     []*ID
 	uuid     *uuid.UUID
 	security Security
-	tls       bool
-	host      string
-	wsConfig  *WebsocketConfig
-	tlsConfig *tls.Config
 }
 
 // Config of vmess
@@ -80,28 +75,13 @@ type Config struct {
 	UUID     string
 	AlterID  uint16
 	Security string
-	TLS              bool
-	HostName         string
 	Port     string
-	NetWork          string
+	HostName string
-	WebSocketPath    string
-	WebSocketHeaders map[string]string
-	SkipCertVerify   bool
-	SessionCache     tls.ClientSessionCache
 }
 
-// New return a Conn with net.Conn and DstAddr
+// StreamConn return a Conn with net.Conn and DstAddr
-func (c *Client) New(conn net.Conn, dst *DstAddr) (net.Conn, error) {
+func (c *Client) StreamConn(conn net.Conn, dst *DstAddr) (net.Conn, error) {
-	var err error
 	r := rand.Intn(len(c.user))
-	if c.wsConfig != nil {
-		conn, err = NewWebsocketConn(conn, c.wsConfig)
-		if err != nil {
-			return nil, err
-		}
-	} else if c.tls {
-		conn = tls.Client(conn, c.tlsConfig)
-	}
 	return newConn(conn, c.user[r], dst, c.security)
 }
 
@@ -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,
 	}, nil
 }
-
-func getClientSessionCache() tls.ClientSessionCache {
-	once.Do(func() {
-		clientSessionCache = tls.NewLRUClientSessionCache(128)
-	})
-	return clientSessionCache
-}

component/vmess/websocket.go

@@ -26,10 +26,12 @@ type websocketConn struct {
 
 type WebsocketConfig struct {
 	Host           string
+	Port           string
 	Path           string
 	Headers        http.Header
 	TLS            bool
-	TLSConfig *tls.Config
+	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 host := c.Headers.Get("Host"); host != "" {
-	if (scheme == "ws" && port != "80") || (scheme == "wss" && port != "443") {
+			dialer.TLSClientConfig.ServerName = host
-		host = c.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

@@ -106,13 +106,19 @@ type RawConfig struct {
 	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"`
 	Experimental  Experimental                      `yaml:"experimental"`
-	Proxy         []map[string]interface{}          `yaml:"Proxy"`
+	Proxy         []map[string]interface{}          `yaml:"proxies"`
-	ProxyGroup    []map[string]interface{}          `yaml:"Proxy Group"`
+	ProxyGroup    []map[string]interface{}          `yaml:"proxy-groups"`
-	Rule          []string                          `yaml:"Rule"`
+	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
@@ -152,6 +158,11 @@ func UnmarshalRawConfig(buf []byte) (*RawConfig, error) {
 				"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 {
@@ -245,14 +256,17 @@ func parseProxies(cfg *RawConfig) (proxies map[string]C.Proxy, providersMap map[
 	groupsConfig := cfg.ProxyGroup
 	providersConfig := cfg.ProxyProvider
 
-	defer func() {
+	if len(proxiesConfig) == 0 {
-		// Destroy already created provider when err != nil
+		proxiesConfig = cfg.ProxyOld
-		if err != nil {
-			for _, provider := range providersMap {
-				provider.Destroy()
 	}
+
+	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())
@@ -272,7 +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 {
@@ -351,6 +365,12 @@ 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, ","))

config/initial.go

@@ -6,6 +6,7 @@ import (
 	"net/http"
 	"os"
 
+	"github.com/Dreamacro/clash/component/mmdb"
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/log"
 )
@@ -27,6 +28,28 @@ func downloadMMDB(path string) (err error) {
 	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 err := downloadMMDB(C.Path.MMDB()); err != nil {
+			return fmt.Errorf("Can't download MMDB: %s", err.Error())
+		}
+	}
+
+	return nil
+}
+
 // Init prepare necessary files
 func Init(dir string) error {
 	// initial homedir
@@ -48,11 +71,8 @@ func Init(dir string) error {
 	}
 
 	// initial mmdb
-	if _, err := os.Stat(C.Path.MMDB()); os.IsNotExist(err) {
+	if err := initMMDB(); err != nil {
-		log.Infoln("Can't find MMDB, start download")
+		return fmt.Errorf("Can't initial MMDB: %w", err)
-		if err := downloadMMDB(C.Path.MMDB()); err != nil {
-			return fmt.Errorf("Can't download MMDB: %s", err.Error())
-		}
 	}
 	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
 )
 
@@ -59,10 +63,14 @@ type PacketConn interface {
 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, 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 {
@@ -86,12 +94,9 @@ func (at AdapterType) String() string {
 	switch at {
 	case Direct:
 		return "Direct"
-	case Fallback:
-		return "Fallback"
 	case Reject:
 		return "Reject"
-	case Selector:
+
-		return "Selector"
 	case Shadowsocks:
 		return "Shadowsocks"
 	case Snell:
@@ -100,12 +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"
 	}
@@ -122,8 +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.
+	// Drop call after packet is used, could recycle buffer in this function.
-	Close() error
+	Drop()
 
 	// LocalAddr returns the source IP/Port of packet
 	LocalAddr() net.Addr

dns/client.go

@@ -34,13 +34,19 @@ func (c *client) ExchangeContext(ctx context.Context, m *D.Msg) (msg *D.Msg, err
 		}
 	}
 
-	d := dialer.Dialer()
+	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"
 		}
-		dialer.DialHook(d, network, ip)
+		if err := dialer.DialHook(d, network, ip); err != nil {
+			return nil, err
+		}
 	}
 
 	c.Client.Dialer = d

dns/filters.go

@@ -14,7 +14,7 @@ type geoipFilter struct{}
 
 func (gf *geoipFilter) Match(ip net.IP) bool {
 	record, _ := mmdb.Instance().Country(ip)
-	return record.Country.IsoCode == "CN" || record.Country.IsoCode == ""
+	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)
@@ -39,8 +46,10 @@ func withFakeIP(fakePool *fakeip.Pool) middleware {
 			msg.Answer = []D.RR{rr}
 
 			setMsgTTL(msg, 1)
-			msg.SetRcode(r, msg.Rcode)
+			msg.SetRcode(r, D.RcodeSuccess)
 			msg.Authoritative = true
+			msg.RecursionAvailable = true
+
 			w.WriteMsg(msg)
 			return
 		}

dns/resolver.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"crypto/tls"
 	"errors"
+	"fmt"
 	"math/rand"
 	"net"
 	"strings"
@@ -41,7 +42,7 @@ type Resolver struct {
 	fallback        []dnsClient
 	fallbackFilters []fallbackFilter
 	group           singleflight.Group
-	cache           *cache.Cache
+	lruCache        *cache.LruCache
 }
 
 // ResolveIP request with TypeA and TypeAAAA, priority return TypeA
@@ -95,31 +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())
+	cache, expireTime, hit := r.lruCache.GetWithExpire(q.String())
-	if cache != nil {
+	if hit {
+		now := time.Now()
 		msg = cache.(*D.Msg).Copy()
+		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 r.fallbackExchange(m)
-			return msg, err
 		}
 
 		return r.batchExchange(r.main, m)
@@ -127,6 +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
@@ -138,7 +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
 	}
@@ -168,13 +184,23 @@ func (r *Resolver) batchExchange(clients []dnsClient, m *D.Msg) (msg *D.Msg, err
 	for _, client := range clients {
 		r := client
 		fast.Go(func() (interface{}, error) {
-			return r.ExchangeContext(ctx, m)
+			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 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)
@@ -192,9 +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]) {
+			if !r.shouldFallback(ips[0]) {
-				go func() { <-fallbackMsg }()
 				msg = res.Msg
+				err = res.Error
 				return msg, err
 			}
 		}
@@ -252,7 +278,7 @@ func (r *Resolver) msgToIP(msg *D.Msg) []net.IP {
 }
 
 func (r *Resolver) asyncExchange(client []dnsClient, msg *D.Msg) <-chan *result {
-	ch := make(chan *result)
+	ch := make(chan *result, 1)
 	go func() {
 		res, err := r.batchExchange(client, msg)
 		ch <- &result{Msg: res, Error: err}
@@ -282,13 +308,13 @@ type Config struct {
 func New(config Config) *Resolver {
 	defaultResolver := &Resolver{
 		main:     transform(config.Default, nil),
-		cache: cache.New(time.Second * 60),
+		lruCache: cache.NewLRUCache(cache.WithSize(4096), cache.WithStale(true)),
 	}
 
 	r := &Resolver{
 		ipv6:     config.IPv6,
 		main:     transform(config.Main, defaultResolver),
-		cache:   cache.New(time.Second * 60),
+		lruCache: cache.NewLRUCache(cache.WithSize(4096), cache.WithStale(true)),
 		mapping:  config.EnhancedMode == MAPPING,
 		fakeip:   config.EnhancedMode == FAKEIP,
 		pool:     config.Pool,

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

@@ -11,7 +11,6 @@ import (
 	"github.com/Dreamacro/clash/log"
 
 	D "github.com/miekg/dns"
-	yaml "gopkg.in/yaml.v2"
 )
 
 var (
@@ -46,8 +45,8 @@ func (e *EnhancedMode) UnmarshalYAML(unmarshal func(interface{}) error) error {
 }
 
 // MarshalYAML serialize EnhancedMode with yaml
-func (e EnhancedMode) MarshalYAML() ([]byte, error) {
+func (e EnhancedMode) MarshalYAML() (interface{}, error) {
-	return yaml.Marshal(e.String())
+	return e.String(), nil
 }
 
 // UnmarshalJSON unserialize EnhancedMode with json
@@ -80,21 +79,21 @@ func (e EnhancedMode) String() string {
 	}
 }
 
-func putMsgToCache(c *cache.Cache, key string, msg *D.Msg) {
+func putMsgToCache(c *cache.LruCache, key string, msg *D.Msg) {
-	var ttl time.Duration
+	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) {
@@ -134,6 +133,7 @@ func transform(servers []NameServer, resolver *Resolver) []dnsClient {
 					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,

go.mod

@@ -1,22 +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 v4.0.3+incompatible
+	github.com/go-chi/chi v4.1.1+incompatible
-	github.com/go-chi/cors v1.0.0
+	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/gofrs/uuid v3.3.0+incompatible
-	github.com/gorilla/websocket v1.4.1
+	github.com/gorilla/websocket v1.4.2
-	github.com/miekg/dns v1.1.27
+	github.com/miekg/dns v1.1.29
 	github.com/oschwald/geoip2-golang v1.4.0
-	github.com/sirupsen/logrus v1.4.2
+	github.com/sirupsen/logrus v1.6.0
-	github.com/stretchr/testify v1.4.0
+	github.com/stretchr/testify v1.5.1
-	golang.org/x/crypto v0.0.0-20200214034016-1d94cc7ab1c6
+	golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79
-	golang.org/x/net v0.0.0-20200202094626-16171245cfb2
+	golang.org/x/net v0.0.0-20200506145744-7e3656a0809f
-	golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e
+	golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a
 	gopkg.in/eapache/channels.v1 v1.1.0
 	gopkg.in/yaml.v2 v2.2.8
 )

go.sum

@@ -5,62 +5,54 @@ 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 v4.0.3+incompatible h1:gakN3pDJnzZN5jqFV2TEdF66rTfKeITyR8qu6ekICEY=
+github.com/go-chi/chi v4.1.1+incompatible h1:MmTgB0R8Bt/jccxp+t6S/1VGIKdJw5J74CK/c9tTfA4=
-github.com/go-chi/chi v4.0.3+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
+github.com/go-chi/chi v4.1.1+incompatible/go.mod h1:eB3wogJHnLi3x/kFX2A+IbTBlXxmMeXJVKy9tTv1XzQ=
-github.com/go-chi/cors v1.0.0 h1:e6x8k7uWbUwYs+aXDoiUzeQFT6l0cygBYyNhD7/1Tg0=
+github.com/go-chi/cors v1.1.1 h1:eHuqxsIw89iXcWnWUN8R72JMibABJTN/4IOYI5WERvw=
-github.com/go-chi/cors v1.0.0/go.mod h1:K2Yje0VW/SJzxiyMYu6iPQYa7hMjQX2i/F491VChg1I=
+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 v3.3.0+incompatible h1:8K4tyRfvU1CYPgJsveYFQMhpFd/wXNM7iK6rR7UHz84=
-github.com/gofrs/uuid v3.2.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
+github.com/gofrs/uuid v3.3.0+incompatible/go.mod h1:b2aQJv3Z4Fp6yNu3cdSllBxTCLRxnplIgP/c0N/04lM=
-github.com/gorilla/websocket v1.4.1 h1:q7AeDBpnBk8AogcD4DSag/Ukw/KV+YhzLj2bP5HvKCM=
+github.com/gorilla/websocket v1.4.2 h1:+/TMaTYc4QFitKJxsQ7Yye35DkWvkdLcvGKqM+x0Ufc=
-github.com/gorilla/websocket v1.4.1/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
+github.com/gorilla/websocket v1.4.2/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
-github.com/konsorten/go-windows-terminal-sequences v1.0.1 h1:mweAR1A6xJ3oS2pRaGiHgQ4OO8tzTaLawm8vnODuwDk=
+github.com/konsorten/go-windows-terminal-sequences v1.0.3 h1:CE8S1cTafDpPvMhIxNJKvHsGVBgn1xWYf1NbHQhywc8=
-github.com/konsorten/go-windows-terminal-sequences v1.0.1/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
+github.com/konsorten/go-windows-terminal-sequences v1.0.3/go.mod h1:T0+1ngSBFLxvqU3pZ+m/2kptfBszLMUkC4ZK/EgS/cQ=
-github.com/miekg/dns v1.1.27 h1:aEH/kqUzUxGJ/UHcEKdJY+ugH6WEzsEBBSPa8zuy1aM=
+github.com/miekg/dns v1.1.29 h1:xHBEhR+t5RzcFJjBLJlax2daXOrTYtr9z4WdKEfWFzg=
-github.com/miekg/dns v1.1.27/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
+github.com/miekg/dns v1.1.29/go.mod h1:KNUDUusw/aVsxyTYZM1oqvCicbwhgbNgztCETuNZ7xM=
 github.com/oschwald/geoip2-golang v1.4.0 h1:5RlrjCgRyIGDz/mBmPfnAF4h8k0IAcRv9PvrpOfz+Ug=
 github.com/oschwald/geoip2-golang v1.4.0/go.mod h1:8QwxJvRImBH+Zl6Aa6MaIcs5YdlZSTKtzmPGzQqi9ng=
 github.com/oschwald/maxminddb-golang v1.6.0 h1:KAJSjdHQ8Kv45nFIbtoLGrGWqHFajOIm7skTyz/+Dls=
 github.com/oschwald/maxminddb-golang v1.6.0/go.mod h1:DUJFucBg2cvqx42YmDa/+xHvb0elJtOm3o4aFQ/nb/w=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
 github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
-github.com/sirupsen/logrus v1.4.2 h1:SPIRibHv4MatM3XXNO2BJeFLZwZ2LvZgfQ5+UNI2im4=
+github.com/sirupsen/logrus v1.6.0 h1:UBcNElsrwanuuMsnGSlYmtmgbb23qDR5dG+6X6Oo89I=
-github.com/sirupsen/logrus v1.4.2/go.mod h1:tLMulIdttU9McNUspp0xgXVQah82FyeX6MwdIuYE2rE=
+github.com/sirupsen/logrus v1.6.0/go.mod h1:7uNnSEd1DgxDLC74fIahvMZmmYsHGZGEOFrfsX/uA88=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/objx v0.1.1 h1:2vfRuCMp5sSVIDSqO8oNnWJq7mPa6KVP3iPIwFBuy8A=
-github.com/stretchr/objx v0.1.1/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
-github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w=
 github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs=
-github.com/stretchr/testify v1.4.0 h1:2E4SXV/wtOkTonXsotYi4li6zVWxYlZuYNCXe9XRJyk=
 github.com/stretchr/testify v1.4.0/go.mod h1:j7eGeouHqKxXV5pUuKE4zz7dFj8WfuZ+81PSLYec5m4=
+github.com/stretchr/testify v1.5.1 h1:nOGnQDM7FYENwehXlg/kFVnos3rEvtKTjRvOWSzb6H4=
+github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
 golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
-golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413 h1:ULYEB3JvPRE/IfO+9uO7vKV/xzVTO7XPAwm8xbf4w2g=
 golang.org/x/crypto v0.0.0-20191206172530-e9b2fee46413/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
-golang.org/x/crypto v0.0.0-20200214034016-1d94cc7ab1c6 h1:Sy5bstxEqwwbYs6n0/pBuxKENqOeZUgD45Gp3Q3pqLg=
+golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79 h1:IaQbIIB2X/Mp/DKctl6ROxz1KyMlKp4uyvL6+kQ7C88=
-golang.org/x/crypto v0.0.0-20200214034016-1d94cc7ab1c6/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
+golang.org/x/crypto v0.0.0-20200429183012-4b2356b1ed79/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
 golang.org/x/mod v0.1.1-0.20191105210325-c90efee705ee/go.mod h1:QqPTAvyqsEbceGzBzNggFXnrqF1CaUcvgkdR5Ot7KZg=
-golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3 h1:0GoQqolDA55aaLxZyTzK/Y2ePZzZTUrRacwib7cNsYQ=
 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
 golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20190923162816-aa69164e4478 h1:l5EDrHhldLYb3ZRHDUhXF7Om7MvYXnkV9/iQNo1lX6g=
 golang.org/x/net v0.0.0-20190923162816-aa69164e4478/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
-golang.org/x/net v0.0.0-20200202094626-16171245cfb2 h1:CCH4IOTTfewWjGOlSp+zGcjutRKlBEZQ6wTn8ozI/nI=
+golang.org/x/net v0.0.0-20200506145744-7e3656a0809f h1:QBjCr1Fz5kw158VqdE9JfI9cJnl/ymnJWAdMuinqL7Y=
-golang.org/x/net v0.0.0-20200202094626-16171245cfb2/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s=
+golang.org/x/net v0.0.0-20200506145744-7e3656a0809f/go.mod h1:qpuaurCH72eLCgpAm/N6yyVIVM9cpaDIP3A8BGJEC5A=
-golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU=
 golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
-golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e h1:vcxGaoTs7kV8m5Np9uUNQin4BrLOthgV7252N8V+FwY=
+golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a h1:WXEvlFVvvGxCJLG6REjsT03iWnKLEWinaScsxF2Vm2o=
-golang.org/x/sync v0.0.0-20190911185100-cd5d95a43a6e/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
+golang.org/x/sync v0.0.0-20200317015054-43a5402ce75a/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM=
 golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY=
-golang.org/x/sys v0.0.0-20190412213103-97732733099d h1:+R4KGOnez64A81RvjARKc4UT5/tI9ujCIVX+P5KiHuI=
 golang.org/x/sys v0.0.0-20190412213103-97732733099d/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190422165155-953cdadca894 h1:Cz4ceDQGXuKRnVBDTS23GTn/pU5OE2C0WrNTOYK1Uuc=
 golang.org/x/sys v0.0.0-20190422165155-953cdadca894/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe h1:6fAMxZRR6sl1Uq8U61gxU+kPTs2tR8uOySCbBP7BN/M=
 golang.org/x/sys v0.0.0-20190924154521-2837fb4f24fe/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
-golang.org/x/sys v0.0.0-20191224085550-c709ea063b76 h1:Dho5nD6R3PcW2SH1or8vS0dszDaXRxIw55lBX7XiE5g=
 golang.org/x/sys v0.0.0-20191224085550-c709ea063b76/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd h1:xhmwyvizuTgC2qz7ZlMluP20uW+C3Rm0FD/WLDX8884=
+golang.org/x/sys v0.0.0-20200323222414-85ca7c5b95cd/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
 golang.org/x/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=
@@ -68,7 +60,6 @@ gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/eapache/channels.v1 v1.1.0 h1:5bGAyKKvyCTWjSj7mhefG6Lc68VyN4MH1v8/7OoeeB4=
 gopkg.in/eapache/channels.v1 v1.1.0/go.mod h1:BHIBujSvu9yMTrTYbTCjDD43gUhtmaOtTWDe7sTv1js=
-gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
 gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=

hub/executor/executor.go

@@ -158,13 +158,6 @@ func updateHosts(tree *trie.Trie) {
 }
 
 func updateProxies(proxies map[string]C.Proxy, providers map[string]provider.ProxyProvider) {
-	oldProviders := tunnel.Providers()
-
-	// close providers goroutine
-	for _, provider := range oldProviders {
-		provider.Destroy()
-	}
-
 	tunnel.UpdateProxies(proxies, providers)
 }
 

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/server.go

@@ -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"
+		hasInvalidHeader := text[0] != "Bearer"
-		hasUnvalidSecret := len(text) == 2 && text[1] != serverSecret
+		hasInvalidSecret := len(text) != 2 || text[1] != serverSecret
-		if hasUnvalidHeader || hasUnvalidSecret {
+		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 (
+	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/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

@@ -55,5 +55,5 @@ func handleRedir(conn net.Conn) {
 		return
 	}
 	conn.(*net.TCPConn).SetKeepAlive(true)
-	tunnel.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

@@ -64,5 +64,5 @@ func handleSocks(conn net.Conn) {
 		io.Copy(ioutil.Discard, conn)
 		return
 	}
-	tunnel.Add(adapters.NewSocket(target, conn, C.SOCKS, C.TCP))
+	tunnel.Add(adapters.NewSocket(target, conn, C.SOCKS))
 }

proxy/socks/udp.go

@@ -5,6 +5,7 @@ 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"
@@ -22,13 +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
 				}
@@ -54,11 +60,11 @@ 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{
+	packet := &packet{
-		PacketConn: pc,
+		pc:      pc,
 		rAddr:   addr,
 		payload: payload,
 		bufRef:  buf,

proxy/socks/utils.go

@@ -7,33 +7,32 @@ import (
 	"github.com/Dreamacro/clash/component/socks5"
 )
 
-type fakeConn struct {
+type packet struct {
-	net.PacketConn
+	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) {
+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.rAddr)
+	return c.pc.WriteTo(packet, c.rAddr)
 }
 
 // LocalAddr returns the source IP/Port of UDP Packet
-func (c *fakeConn) LocalAddr() net.Addr {
+func (c *packet) LocalAddr() net.Addr {
 	return c.rAddr
 }
 
-func (c *fakeConn) Close() error {
+func (c *packet) Drop() {
-	err := c.PacketConn.Close()
+	pool.Put(c.bufRef)
-	pool.BufPool.Put(c.bufRef[:cap(c.bufRef)])
+	return
-	return err
 }

tunnel/connection.go

@@ -18,8 +18,8 @@ func handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
 	req := request.R
 	host := req.Host
 
-	inboundReeder := bufio.NewReader(request)
+	inboundReader := bufio.NewReader(request)
-	outboundReeder := bufio.NewReader(outbound)
+	outboundReader := bufio.NewReader(outbound)
 
 	for {
 		keepAlive := strings.TrimSpace(strings.ToLower(req.Header.Get("Proxy-Connection"))) == "keep-alive"
@@ -33,7 +33,7 @@ func 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 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
 		}
@@ -82,15 +82,16 @@ func handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
 }
 
 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 handleUDPToLocal(packet C.UDPPacket, pc net.PacketConn, key string) {
+func handleUDPToLocal(packet C.UDPPacket, pc net.PacketConn, key string, fAddr net.Addr) {
-	buf := pool.BufPool.Get().([]byte)
+	buf := pool.Get(pool.RelayBufferSize)
-	defer pool.BufPool.Put(buf[:cap(buf)])
+	defer pool.Put(buf)
 	defer natTable.Delete(key)
 	defer pc.Close()
 
@@ -101,11 +102,14 @@ func handleUDPToLocal(packet C.UDPPacket, pc net.PacketConn, key string) {
 			return
 		}
 
+		if fAddr != nil {
+			from = fAddr
+		}
+
 		n, err = packet.WriteBack(buf[:n], from)
 		if err != nil {
 			return
 		}
-		DefaultManager.Download() <- int64(n)
 	}
 }
 
@@ -118,16 +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/mode.go

@@ -51,6 +51,11 @@ func (m TunnelMode) MarshalJSON() ([]byte, error) {
 	return json.Marshal(m.String())
 }
 
+// MarshalYAML serialize TunnelMode with yaml
+func (m TunnelMode) MarshalYAML() (interface{}, error) {
+	return m.String(), nil
+}
+
 func (m TunnelMode) String() string {
 	switch m {
 	case Global:

tunnel/tracker.go

@@ -103,6 +103,14 @@ func (ut *udpTracker) WriteTo(b []byte, addr net.Addr) (int, error) {
 	return n, err
 }
 
+func (ut *udpTracker) WriteWithMetadata(p []byte, metadata *C.Metadata) (int, error) {
+	n, err := ut.PacketConn.WriteWithMetadata(p, metadata)
+	upload := int64(n)
+	ut.manager.Upload() <- upload
+	ut.UploadTotal += upload
+	return n, err
+}
+
 func (ut *udpTracker) Close() error {
 	ut.manager.Leave(ut)
 	return ut.PacketConn.Close()

tunnel/tunnel.go

@@ -147,6 +147,9 @@ func preHandleMetadata(metadata *C.Metadata) error {
 			metadata.AddrType = C.AtypDomainName
 			if enhancedMode.FakeIPEnabled() {
 				metadata.DstIP = nil
+			} else if node := resolver.DefaultHosts.Search(host); node != nil {
+				// redir-host should lookup the hosts
+				metadata.DstIP = node.Data.(net.IP)
 			}
 		} else if enhancedMode.IsFakeIP(metadata.DstIP) {
 			return fmt.Errorf("fake DNS record %s missing", metadata.DstIP)
@@ -182,6 +185,12 @@ func handleUDPConn(packet *inbound.PacketAdapter) {
 		return
 	}
 
+	// make a fAddr if requset ip is fakeip
+	var fAddr net.Addr
+	if enhancedMode != nil && enhancedMode.IsFakeIP(metadata.DstIP) {
+		fAddr = metadata.UDPAddr()
+	}
+
 	if err := preHandleMetadata(metadata); err != nil {
 		log.Debugln("[Metadata PreHandle] error: %s", err)
 		return
@@ -231,7 +240,7 @@ func handleUDPConn(packet *inbound.PacketAdapter) {
 			natTable.Set(key, pc)
 			natTable.Delete(lockKey)
 			wg.Done()
-			go handleUDPToLocal(packet.UDPPacket, pc, key)
+			go handleUDPToLocal(packet.UDPPacket, pc, key, fAddr)
 		}
 
 		wg.Wait()