Chore: update README.md

.travis.yml

@@ -1,7 +1,7 @@
 language: go
 sudo: false
 go:
-  - "1.11"
+  - '1.12'
 install:
   - "go mod download"
 env:

Makefile

@@ -1,6 +1,10 @@
 NAME=clash
 BINDIR=bin
-GOBUILD=CGO_ENABLED=0 go build -ldflags '-w -s'
+VERSION=$(shell git describe --tags --long --dirty || echo "unkown version")
+BUILDTIME=$(shell date -u)
+GOBUILD=CGO_ENABLED=0 go build -ldflags '-X "github.com/Dreamacro/clash/constant.Version=$(VERSION)" \
+		-X "github.com/Dreamacro/clash/constant.BuildTime=$(BUILDTIME)" \
+		-w -s'
 
 PLATFORM_LIST = \
 	darwin-amd64 \
@@ -67,7 +71,7 @@ freebsd-amd64:
 	GOARCH=amd64 GOOS=freebsd $(GOBUILD) -o $(BINDIR)/$(NAME)-$@
 
 windows-386:
-	GOARCH=amd64 GOOS=windows $(GOBUILD) -o $(BINDIR)/$(NAME)-$@.exe
+	GOARCH=386 GOOS=windows $(GOBUILD) -o $(BINDIR)/$(NAME)-$@.exe
 
 windows-amd64:
 	GOARCH=amd64 GOOS=windows $(GOBUILD) -o $(BINDIR)/$(NAME)-$@.exe
@@ -77,10 +81,10 @@ zip_releases=$(addsuffix .zip, $(WINDOWS_ARCH_LIST))
 
 $(gz_releases): %.gz : %
 	chmod +x $(BINDIR)/$(NAME)-$(basename $@)
-	gzip -f $(BINDIR)/$(NAME)-$(basename $@)
+	tar -czf $(BINDIR)/$(NAME)-$(basename $@)-$(VERSION).tar.gz -C $(BINDIR) $(NAME)-$(basename $@)
 
 $(zip_releases): %.zip : %
-	zip -m -j $(BINDIR)/$(NAME)-$(basename $@).zip $(BINDIR)/$(NAME)-$(basename $@).exe
+	zip -m -j $(BINDIR)/$(NAME)-$(basename $@)-$(VERSION).zip $(BINDIR)/$(NAME)-$(basename $@).exe
 
 all-arch: $(PLATFORM_LIST) $(WINDOWS_ARCH_LIST)
 

README.md

@@ -36,7 +36,13 @@ go get -u -v github.com/Dreamacro/clash
 
 Pre-built binaries are available: [release](https://github.com/Dreamacro/clash/releases)
 
-Requires Go >= 1.11.
+Requires Go >= 1.12.
+
+Checkout Clash version:
+
+```sh
+clash -v
+```
 
 ## Daemon
 
@@ -108,7 +114,7 @@ external-controller: 127.0.0.1:9090
   #   - 114.114.114.114
   #   - tls://dns.rubyfish.cn:853 # dns over tls
   # fallback: # concurrent request with nameserver, fallback used when GEOIP country isn't CN
-  #   - 8.8.8.8
+  #   - tcp://1.1.1.1
 
 Proxy:
 
@@ -143,6 +149,8 @@ Proxy:
     # skip-cert-verify: true
     # host: bing.com
     # path: "/"
+    # headers:
+    #   custom: value
 
 # vmess
 # cipher support auto/aes-128-gcm/chacha20-poly1305/none
@@ -182,7 +190,7 @@ Proxy Group:
 - { name: "fallback-auto", type: fallback, proxies: ["ss1", "ss2", "vmess1"], url: "http://www.gstatic.com/generate_204", interval: 300 }
 
 # load-balance: The request of the same eTLD will be dial on the same proxy.
-- { name: "load-balance", type: load-balance, proxies: ["ss1", "ss2", "vmess1"] }
+- { name: "load-balance", type: load-balance, proxies: ["ss1", "ss2", "vmess1"], url: "http://www.gstatic.com/generate_204", interval: 300 }
 
 # select is used for selecting proxy or proxy group
 # you can use RESTful API to switch proxy, is recommended for use in GUI.

adapters/outbound/base.go

@@ -2,7 +2,11 @@ package adapters
 
 import (
 	"encoding/json"
+	"net"
+	"net/http"
+	"time"
 
+	"github.com/Dreamacro/clash/common/queue"
 	C "github.com/Dreamacro/clash/constant"
 )
 
@@ -19,8 +23,116 @@ func (b *Base) Type() C.AdapterType {
 	return b.tp
 }
 
+func (b *Base) Destroy() {}
+
 func (b *Base) MarshalJSON() ([]byte, error) {
 	return json.Marshal(map[string]string{
 		"type": b.Type().String(),
 	})
 }
+
+type Proxy struct {
+	C.ProxyAdapter
+	history *queue.Queue
+	alive   bool
+}
+
+func (p *Proxy) Alive() bool {
+	return p.alive
+}
+
+func (p *Proxy) Dial(metadata *C.Metadata) (net.Conn, error) {
+	conn, err := p.ProxyAdapter.Dial(metadata)
+	if err != nil {
+		p.alive = false
+	}
+	return conn, err
+}
+
+func (p *Proxy) DelayHistory() []C.DelayHistory {
+	queue := p.history.Copy()
+	histories := []C.DelayHistory{}
+	for _, item := range queue {
+		histories = append(histories, item.(C.DelayHistory))
+	}
+	return histories
+}
+
+// LastDelay return last history record. if proxy is not alive, return the max value of int16.
+func (p *Proxy) LastDelay() (delay uint16) {
+	var max uint16 = 0xffff
+	if !p.alive {
+		return max
+	}
+
+	head := p.history.First()
+	if head == nil {
+		return max
+	}
+	history := head.(C.DelayHistory)
+	if history.Delay == 0 {
+		return max
+	}
+	return history.Delay
+}
+
+func (p *Proxy) MarshalJSON() ([]byte, error) {
+	inner, err := p.ProxyAdapter.MarshalJSON()
+	if err != nil {
+		return inner, err
+	}
+
+	mapping := map[string]interface{}{}
+	json.Unmarshal(inner, &mapping)
+	mapping["history"] = p.DelayHistory()
+	return json.Marshal(mapping)
+}
+
+// URLTest get the delay for the specified URL
+func (p *Proxy) URLTest(url string) (t uint16, err error) {
+	defer func() {
+		p.alive = err == nil
+		record := C.DelayHistory{Time: time.Now()}
+		if err == nil {
+			record.Delay = t
+		}
+		p.history.Put(record)
+		if p.history.Len() > 10 {
+			p.history.Pop()
+		}
+	}()
+
+	addr, err := urlToMetadata(url)
+	if err != nil {
+		return
+	}
+
+	start := time.Now()
+	instance, err := p.Dial(&addr)
+	if err != nil {
+		return
+	}
+	defer instance.Close()
+	transport := &http.Transport{
+		Dial: func(string, string) (net.Conn, error) {
+			return instance, nil
+		},
+		// from http.DefaultTransport
+		MaxIdleConns:          100,
+		IdleConnTimeout:       90 * time.Second,
+		TLSHandshakeTimeout:   10 * time.Second,
+		ExpectContinueTimeout: 1 * time.Second,
+	}
+	client := http.Client{Transport: transport}
+	resp, err := client.Get(url)
+	if err != nil {
+		return
+	}
+	resp.Body.Close()
+	t = uint16(time.Since(start) / time.Millisecond)
+	return
+}
+
+func NewProxy(adapter C.ProxyAdapter) *Proxy {
+	return &Proxy{adapter, queue.New(10), true}
+}

adapters/outbound/direct.go

@@ -10,7 +10,7 @@ type Direct struct {
 	*Base
 }
 
-func (d *Direct) Generator(metadata *C.Metadata) (net.Conn, error) {
+func (d *Direct) Dial(metadata *C.Metadata) (net.Conn, error) {
 	address := net.JoinHostPort(metadata.Host, metadata.Port)
 	if metadata.IP != nil {
 		address = net.JoinHostPort(metadata.IP.String(), metadata.Port)

adapters/outbound/fallback.go

@@ -10,14 +10,9 @@ import (
 	C "github.com/Dreamacro/clash/constant"
 )
 
-type proxy struct {
-	RawProxy C.Proxy
-	Valid    bool
-}
-
 type Fallback struct {
 	*Base
-	proxies  []*proxy
+	proxies  []C.Proxy
 	rawURL   string
 	interval time.Duration
 	done     chan struct{}
@@ -31,36 +26,19 @@ type FallbackOption struct {
 }
 
 func (f *Fallback) Now() string {
-	_, proxy := f.findNextValidProxy(0)
+	proxy := f.findAliveProxy()
-	if proxy != nil {
+	return proxy.Name()
-		return proxy.RawProxy.Name()
-	}
-	return f.proxies[0].RawProxy.Name()
 }
 
-func (f *Fallback) Generator(metadata *C.Metadata) (net.Conn, error) {
+func (f *Fallback) Dial(metadata *C.Metadata) (net.Conn, error) {
-	idx := 0
+	proxy := f.findAliveProxy()
-	var proxy *proxy
+	return proxy.Dial(metadata)
-	for {
-		idx, proxy = f.findNextValidProxy(idx)
-		if proxy == nil {
-			break
-		}
-		adapter, err := proxy.RawProxy.Generator(metadata)
-		if err != nil {
-			proxy.Valid = false
-			idx++
-			continue
-		}
-		return adapter, err
-	}
-	return f.proxies[0].RawProxy.Generator(metadata)
 }
 
 func (f *Fallback) MarshalJSON() ([]byte, error) {
 	var all []string
 	for _, proxy := range f.proxies {
-		all = append(all, proxy.RawProxy.Name())
+		all = append(all, proxy.Name())
 	}
 	return json.Marshal(map[string]interface{}{
 		"type": f.Type().String(),
@@ -69,7 +47,7 @@ func (f *Fallback) MarshalJSON() ([]byte, error) {
 	})
 }
 
-func (f *Fallback) Close() {
+func (f *Fallback) Destroy() {
 	f.done <- struct{}{}
 }
 
@@ -87,13 +65,13 @@ Loop:
 	}
 }
 
-func (f *Fallback) findNextValidProxy(start int) (int, *proxy) {
+func (f *Fallback) findAliveProxy() C.Proxy {
-	for i := start; i < len(f.proxies); i++ {
+	for _, proxy := range f.proxies {
-		if f.proxies[i].Valid {
+		if proxy.Alive() {
-			return i, f.proxies[i]
+			return proxy
 		}
 	}
-	return -1, nil
+	return f.proxies[0]
 }
 
 func (f *Fallback) validTest() {
@@ -101,9 +79,8 @@ func (f *Fallback) validTest() {
 	wg.Add(len(f.proxies))
 
 	for _, p := range f.proxies {
-		go func(p *proxy) {
+		go func(p C.Proxy) {
-			_, err := DelayTest(p.RawProxy, f.rawURL)
+			p.URLTest(f.rawURL)
-			p.Valid = err == nil
 			wg.Done()
 		}(p)
 	}
@@ -122,20 +99,13 @@ func NewFallback(option FallbackOption, proxies []C.Proxy) (*Fallback, error) {
 	}
 
 	interval := time.Duration(option.Interval) * time.Second
-	warpperProxies := make([]*proxy, len(proxies))
-	for idx := range proxies {
-		warpperProxies[idx] = &proxy{
-			RawProxy: proxies[idx],
-			Valid:    true,
-		}
-	}
 
 	Fallback := &Fallback{
 		Base: &Base{
 			name: option.Name,
 			tp:   C.Fallback,
 		},
-		proxies:  warpperProxies,
+		proxies:  proxies,
 		rawURL:   option.URL,
 		interval: interval,
 		done:     make(chan struct{}),

adapters/outbound/http.go

@@ -35,7 +35,7 @@ type HttpOption struct {
 	SkipCertVerify bool   `proxy:"skip-cert-verify,omitempty"`
 }
 
-func (h *Http) Generator(metadata *C.Metadata) (net.Conn, error) {
+func (h *Http) Dial(metadata *C.Metadata) (net.Conn, error) {
 	c, err := net.DialTimeout("tcp", h.addr, tcpTimeout)
 	if err == nil && h.tls {
 		cc := tls.Client(c, h.tlsConfig)
@@ -101,8 +101,6 @@ func NewHttp(option HttpOption) *Http {
 		tlsConfig = &tls.Config{
 			InsecureSkipVerify: option.SkipCertVerify,
 			ClientSessionCache: getClientSessionCache(),
-			MinVersion:         tls.VersionTLS11,
-			MaxVersion:         tls.VersionTLS12,
 			ServerName:         option.Server,
 		}
 	}

adapters/outbound/loadbalance.go

@@ -4,6 +4,8 @@ import (
 	"encoding/json"
 	"errors"
 	"net"
+	"sync"
+	"time"
 
 	"github.com/Dreamacro/clash/common/murmur3"
 	C "github.com/Dreamacro/clash/constant"
@@ -15,6 +17,9 @@ type LoadBalance struct {
 	*Base
 	proxies  []C.Proxy
 	maxRetry int
+	rawURL   string
+	interval time.Duration
+	done     chan struct{}
 }
 
 func getKey(metadata *C.Metadata) string {
@@ -48,18 +53,50 @@ func jumpHash(key uint64, buckets int32) int32 {
 	return int32(b)
 }
 
-func (lb *LoadBalance) Generator(metadata *C.Metadata) (net.Conn, error) {
+func (lb *LoadBalance) Dial(metadata *C.Metadata) (net.Conn, error) {
 	key := uint64(murmur3.Sum32([]byte(getKey(metadata))))
 	buckets := int32(len(lb.proxies))
-	for i := 0; i < lb.maxRetry; i++ {
+	for i := 0; i < lb.maxRetry; i, key = i+1, key+1 {
 		idx := jumpHash(key, buckets)
-		if proxy, err := lb.proxies[idx].Generator(metadata); err == nil {
+		proxy := lb.proxies[idx]
-			return proxy, nil
+		if proxy.Alive() {
+			return proxy.Dial(metadata)
 		}
-		key++
 	}
 
-	return lb.proxies[0].Generator(metadata)
+	return lb.proxies[0].Dial(metadata)
+}
+
+func (lb *LoadBalance) Destroy() {
+	lb.done <- struct{}{}
+}
+
+func (lb *LoadBalance) validTest() {
+	wg := sync.WaitGroup{}
+	wg.Add(len(lb.proxies))
+
+	for _, p := range lb.proxies {
+		go func(p C.Proxy) {
+			p.URLTest(lb.rawURL)
+			wg.Done()
+		}(p)
+	}
+
+	wg.Wait()
+}
+
+func (lb *LoadBalance) loop() {
+	tick := time.NewTicker(lb.interval)
+	go lb.validTest()
+Loop:
+	for {
+		select {
+		case <-tick.C:
+			go lb.validTest()
+		case <-lb.done:
+			break Loop
+		}
+	}
 }
 
 func (lb *LoadBalance) MarshalJSON() ([]byte, error) {
@@ -76,19 +113,28 @@ func (lb *LoadBalance) MarshalJSON() ([]byte, error) {
 type LoadBalanceOption struct {
 	Name     string   `proxy:"name"`
 	Proxies  []string `proxy:"proxies"`
+	URL      string   `proxy:"url"`
+	Interval int      `proxy:"interval"`
 }
 
-func NewLoadBalance(name string, proxies []C.Proxy) (*LoadBalance, error) {
+func NewLoadBalance(option LoadBalanceOption, proxies []C.Proxy) (*LoadBalance, error) {
 	if len(proxies) == 0 {
 		return nil, errors.New("Provide at least one proxy")
 	}
 
-	return &LoadBalance{
+	interval := time.Duration(option.Interval) * time.Second
+
+	lb := &LoadBalance{
 		Base: &Base{
-			name: name,
+			name: option.Name,
 			tp:   C.LoadBalance,
 		},
 		proxies:  proxies,
 		maxRetry: 3,
-	}, nil
+		rawURL:   option.URL,
+		interval: interval,
+		done:     make(chan struct{}),
+	}
+	go lb.loop()
+	return lb, nil
 }

adapters/outbound/reject.go

@@ -12,7 +12,7 @@ type Reject struct {
 	*Base
 }
 
-func (r *Reject) Generator(metadata *C.Metadata) (net.Conn, error) {
+func (r *Reject) Dial(metadata *C.Metadata) (net.Conn, error) {
 	return &NopConn{}, nil
 }
 

adapters/outbound/selector.go

@@ -20,8 +20,8 @@ type SelectorOption struct {
 	Proxies []string `proxy:"proxies"`
 }
 
-func (s *Selector) Generator(metadata *C.Metadata) (net.Conn, error) {
+func (s *Selector) Dial(metadata *C.Metadata) (net.Conn, error) {
-	return s.selected.Generator(metadata)
+	return s.selected.Dial(metadata)
 }
 
 func (s *Selector) MarshalJSON() ([]byte, error) {

adapters/outbound/shadowsocks.go

@@ -52,10 +52,11 @@ type v2rayObfsOption struct {
 	Host           string            `obfs:"host,omitempty"`
 	Path           string            `obfs:"path,omitempty"`
 	TLS            bool              `obfs:"tls,omitempty"`
+	Headers        map[string]string `obfs:"headers,omitempty"`
 	SkipCertVerify bool              `obfs:"skip-cert-verify,omitempty"`
 }
 
-func (ss *ShadowSocks) Generator(metadata *C.Metadata) (net.Conn, error) {
+func (ss *ShadowSocks) Dial(metadata *C.Metadata) (net.Conn, error) {
 	c, err := net.DialTimeout("tcp", ss.server, tcpTimeout)
 	if err != nil {
 		return nil, fmt.Errorf("%s connect error: %s", ss.server, err.Error())
@@ -131,10 +132,10 @@ func NewShadowSocks(option ShadowSocksOption) (*ShadowSocks, error) {
 				ClientSessionCache: getClientSessionCache(),
 			}
 		}
-
 		wsOption = &v2rayObfs.WebsocketOption{
 			Host:      opts.Host,
 			Path:      opts.Path,
+			Headers:   opts.Headers,
 			TLSConfig: tlsConfig,
 		}
 	}

adapters/outbound/socks5.go

@@ -34,7 +34,7 @@ type Socks5Option struct {
 	SkipCertVerify bool   `proxy:"skip-cert-verify,omitempty"`
 }
 
-func (ss *Socks5) Generator(metadata *C.Metadata) (net.Conn, error) {
+func (ss *Socks5) Dial(metadata *C.Metadata) (net.Conn, error) {
 	c, err := net.DialTimeout("tcp", ss.addr, tcpTimeout)
 
 	if err == nil && ss.tls {
@@ -118,8 +118,6 @@ func NewSocks5(option Socks5Option) *Socks5 {
 		tlsConfig = &tls.Config{
 			InsecureSkipVerify: option.SkipCertVerify,
 			ClientSessionCache: getClientSessionCache(),
-			MinVersion:         tls.VersionTLS11,
-			MaxVersion:         tls.VersionTLS12,
 			ServerName:         option.Server,
 		}
 	}

adapters/outbound/urltest.go

@@ -1,6 +1,7 @@
 package adapters
 
 import (
+	"context"
 	"encoding/json"
 	"errors"
 	"net"
@@ -9,6 +10,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	"github.com/Dreamacro/clash/common/picker"
 	C "github.com/Dreamacro/clash/constant"
 )
 
@@ -33,10 +35,10 @@ func (u *URLTest) Now() string {
 	return u.fast.Name()
 }
 
-func (u *URLTest) Generator(metadata *C.Metadata) (net.Conn, error) {
+func (u *URLTest) Dial(metadata *C.Metadata) (net.Conn, error) {
-	a, err := u.fast.Generator(metadata)
+	a, err := u.fast.Dial(metadata)
 	if err != nil {
-		go u.speedTest()
+		u.fallback()
 	}
 	return a, err
 }
@@ -54,7 +56,7 @@ func (u *URLTest) MarshalJSON() ([]byte, error) {
 	})
 }
 
-func (u *URLTest) Close() {
+func (u *URLTest) Destroy() {
 	u.done <- struct{}{}
 }
 
@@ -72,8 +74,25 @@ Loop:
 	}
 }
 
+func (u *URLTest) fallback() {
+	fast := u.proxies[0]
+	min := fast.LastDelay()
+	for _, proxy := range u.proxies[1:] {
+		if !proxy.Alive() {
+			continue
+		}
+
+		delay := proxy.LastDelay()
+		if delay < min {
+			fast = proxy
+			min = delay
+		}
+	}
+	u.fast = fast
+}
+
 func (u *URLTest) speedTest() {
-	if atomic.AddInt32(&u.once, 1) != 1 {
+	if !atomic.CompareAndSwapInt32(&u.once, 0, 1) {
 		return
 	}
 	defer atomic.StoreInt32(&u.once, 0)
@@ -81,12 +100,12 @@ func (u *URLTest) speedTest() {
 	wg := sync.WaitGroup{}
 	wg.Add(len(u.proxies))
 	c := make(chan interface{})
-	fast := selectFast(c)
+	fast := picker.SelectFast(context.Background(), c)
 	timer := time.NewTimer(u.interval)
 
 	for _, p := range u.proxies {
 		go func(p C.Proxy) {
-			_, err := DelayTest(p, u.rawURL)
+			_, err := p.URLTest(u.rawURL)
 			if err == nil {
 				c <- p
 			}

adapters/outbound/util.go

@@ -4,7 +4,6 @@ import (
 	"crypto/tls"
 	"fmt"
 	"net"
-	"net/http"
 	"net/url"
 	"sync"
 	"time"
@@ -21,39 +20,6 @@ var (
 	once                     sync.Once
 )
 
-// DelayTest get the delay for the specified URL
-func DelayTest(proxy C.Proxy, url string) (t int16, err error) {
-	addr, err := urlToMetadata(url)
-	if err != nil {
-		return
-	}
-
-	start := time.Now()
-	instance, err := proxy.Generator(&addr)
-	if err != nil {
-		return
-	}
-	defer instance.Close()
-	transport := &http.Transport{
-		Dial: func(string, string) (net.Conn, error) {
-			return instance, nil
-		},
-		// from http.DefaultTransport
-		MaxIdleConns:          100,
-		IdleConnTimeout:       90 * time.Second,
-		TLSHandshakeTimeout:   10 * time.Second,
-		ExpectContinueTimeout: 1 * time.Second,
-	}
-	client := http.Client{Transport: transport}
-	resp, err := client.Get(url)
-	if err != nil {
-		return
-	}
-	resp.Body.Close()
-	t = int16(time.Since(start) / time.Millisecond)
-	return
-}
-
 func urlToMetadata(rawURL string) (addr C.Metadata, err error) {
 	u, err := url.Parse(rawURL)
 	if err != nil {
@@ -81,21 +47,6 @@ func urlToMetadata(rawURL string) (addr C.Metadata, err error) {
 	return
 }
 
-func selectFast(in chan interface{}) chan interface{} {
-	out := make(chan interface{})
-	go func() {
-		p, open := <-in
-		if open {
-			out <- p
-		}
-		close(out)
-		for range in {
-		}
-	}()
-
-	return out
-}
-
 func tcpKeepAlive(c net.Conn) {
 	if tcp, ok := c.(*net.TCPConn); ok {
 		tcp.SetKeepAlive(true)

adapters/outbound/vmess.go

@@ -30,7 +30,7 @@ type VmessOption struct {
 	SkipCertVerify bool              `proxy:"skip-cert-verify,omitempty"`
 }
 
-func (v *Vmess) Generator(metadata *C.Metadata) (net.Conn, error) {
+func (v *Vmess) Dial(metadata *C.Metadata) (net.Conn, error) {
 	c, err := net.DialTimeout("tcp", v.server, tcpTimeout)
 	if err != nil {
 		return nil, fmt.Errorf("%s connect error", v.server)

common/queue/queue.go

@@ -0,0 +1,71 @@
+package queue
+
+import (
+	"sync"
+)
+
+// Queue is a simple concurrent safe queue
+type Queue struct {
+	items []interface{}
+	lock  sync.RWMutex
+}
+
+// Put add the item to the queue.
+func (q *Queue) Put(items ...interface{}) {
+	if len(items) == 0 {
+		return
+	}
+
+	q.lock.Lock()
+	q.items = append(q.items, items...)
+	q.lock.Unlock()
+}
+
+// Pop returns the head of items.
+func (q *Queue) Pop() interface{} {
+	if len(q.items) == 0 {
+		return nil
+	}
+
+	q.lock.Lock()
+	head := q.items[0]
+	q.items = q.items[1:]
+	q.lock.Unlock()
+	return head
+}
+
+// First returns the head of items without deleting.
+func (q *Queue) First() interface{} {
+	if len(q.items) == 0 {
+		return nil
+	}
+
+	q.lock.RLock()
+	head := q.items[0]
+	q.lock.RUnlock()
+	return head
+}
+
+// Copy get the copy of queue.
+func (q *Queue) Copy() []interface{} {
+	items := []interface{}{}
+	q.lock.RLock()
+	items = append(items, q.items...)
+	q.lock.RUnlock()
+	return items
+}
+
+// Len returns the number of items in this queue.
+func (q *Queue) Len() int64 {
+	q.lock.Lock()
+	defer q.lock.Unlock()
+
+	return int64(len(q.items))
+}
+
+// New is a constructor for a new concurrent safe queue.
+func New(hint int64) *Queue {
+	return &Queue{
+		items: make([]interface{}, 0, hint),
+	}
+}

common/structure/structure.go

@@ -47,11 +47,11 @@ func (d *Decoder) Decode(src map[string]interface{}, dst interface{}) error {
 		}
 
 		value, ok := src[key]
-		if !ok {
+		if !ok || value == nil {
 			if omitempty {
 				continue
 			}
-			return fmt.Errorf("key %s missing", key)
+			return fmt.Errorf("key '%s' missing", key)
 		}
 
 		err := d.decode(key, value, v.Field(idx))

component/v2ray-plugin/websocket.go

@@ -11,6 +11,7 @@ import (
 type WebsocketOption struct {
 	Host      string
 	Path      string
+	Headers   map[string]string
 	TLSConfig *tls.Config
 }
 
@@ -20,6 +21,7 @@ func NewWebsocketObfs(conn net.Conn, option *WebsocketOption) (net.Conn, error)
 		Host:      option.Host,
 		Path:      option.Path,
 		TLS:       option.TLSConfig != nil,
+		Headers:   option.Headers,
 		TLSConfig: option.TLSConfig,
 	}
 

config/config.go

@@ -184,8 +184,8 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 
 	decoder := structure.NewDecoder(structure.Option{TagName: "proxy", WeaklyTypedInput: true})
 
-	proxies["DIRECT"] = adapters.NewDirect()
+	proxies["DIRECT"] = adapters.NewProxy(adapters.NewDirect())
-	proxies["REJECT"] = adapters.NewReject()
+	proxies["REJECT"] = adapters.NewProxy(adapters.NewReject())
 
 	// parse proxy
 	for idx, mapping := range proxiesConfig {
@@ -194,7 +194,7 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 			return nil, fmt.Errorf("Proxy %d missing type", idx)
 		}
 
-		var proxy C.Proxy
+		var proxy C.ProxyAdapter
 		err := fmt.Errorf("can't parse")
 		switch proxyType {
 		case "ss":
@@ -236,7 +236,7 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 		if _, exist := proxies[proxy.Name()]; exist {
 			return nil, fmt.Errorf("Proxy %s is the duplicate name", proxy.Name())
 		}
-		proxies[proxy.Name()] = proxy
+		proxies[proxy.Name()] = adapters.NewProxy(proxy)
 	}
 
 	// parse proxy group
@@ -250,7 +250,7 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 		if _, exist := proxies[groupName]; exist {
 			return nil, fmt.Errorf("ProxyGroup %s: the duplicate name", groupName)
 		}
-		var group C.Proxy
+		var group C.ProxyAdapter
 		ps := []C.Proxy{}
 
 		err := fmt.Errorf("can't parse")
@@ -302,12 +302,12 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 			if err != nil {
 				return nil, fmt.Errorf("ProxyGroup %s: %s", groupName, err.Error())
 			}
-			group, err = adapters.NewLoadBalance(loadBalanceOption.Name, ps)
+			group, err = adapters.NewLoadBalance(*loadBalanceOption, ps)
 		}
 		if err != nil {
 			return nil, fmt.Errorf("Proxy %s: %s", groupName, err.Error())
 		}
-		proxies[groupName] = group
+		proxies[groupName] = adapters.NewProxy(group)
 	}
 
 	ps := []C.Proxy{}
@@ -315,7 +315,8 @@ func parseProxies(cfg *rawConfig) (map[string]C.Proxy, error) {
 		ps = append(ps, v)
 	}
 
-	proxies["GLOBAL"], _ = adapters.NewSelector("GLOBAL", ps)
+	global, _ := adapters.NewSelector("GLOBAL", ps)
+	proxies["GLOBAL"] = adapters.NewProxy(global)
 	return proxies, nil
 }
 
@@ -338,28 +339,39 @@ func parseRules(cfg *rawConfig) ([]C.Rule, error) {
 			payload = rule[1]
 			target = rule[2]
 		default:
-			return nil, fmt.Errorf("Rules[%d] [- %s] error: format invalid", idx, line)
+			return nil, fmt.Errorf("Rules[%d] [%s] error: format invalid", idx, line)
 		}
 
 		rule = trimArr(rule)
+		var parsed C.Rule
 		switch rule[0] {
 		case "DOMAIN":
-			rules = append(rules, R.NewDomain(payload, target))
+			parsed = R.NewDomain(payload, target)
 		case "DOMAIN-SUFFIX":
-			rules = append(rules, R.NewDomainSuffix(payload, target))
+			parsed = R.NewDomainSuffix(payload, target)
 		case "DOMAIN-KEYWORD":
-			rules = append(rules, R.NewDomainKeyword(payload, target))
+			parsed = R.NewDomainKeyword(payload, target)
 		case "GEOIP":
-			rules = append(rules, R.NewGEOIP(payload, target))
+			parsed = R.NewGEOIP(payload, target)
 		case "IP-CIDR", "IP-CIDR6":
-			rules = append(rules, R.NewIPCIDR(payload, target, false))
+			if rule := R.NewIPCIDR(payload, target, false); rule != nil {
+				parsed = rule
+			}
 		case "SOURCE-IP-CIDR":
-			rules = append(rules, R.NewIPCIDR(payload, target, true))
+			if rule := R.NewIPCIDR(payload, target, true); rule != nil {
+				parsed = rule
+			}
 		case "MATCH":
 			fallthrough
 		case "FINAL":
-			rules = append(rules, R.NewFinal(target))
+			parsed = R.NewMatch(target)
 		}
+
+		if parsed == nil {
+			return nil, fmt.Errorf("Rules[%d] [%s] error: payload invalid", idx, line)
+		}
+
+		rules = append(rules, parsed)
 	}
 
 	return rules, nil
@@ -387,33 +399,40 @@ func parseNameServer(servers []string) ([]dns.NameServer, error) {
 
 	for idx, server := range servers {
 		// parse without scheme .e.g 8.8.8.8:53
-		if host, err := hostWithDefaultPort(server, "53"); err == nil {
+		if !strings.Contains(server, "://") {
-			nameservers = append(
+			server = "udp://" + server
-				nameservers,
-				dns.NameServer{Addr: host},
-			)
-			continue
 		}
-
 		u, err := url.Parse(server)
 		if err != nil {
 			return nil, fmt.Errorf("DNS NameServer[%d] format error: %s", idx, err.Error())
 		}
 
-		if u.Scheme != "tls" {
+		var host, dnsNetType string
+		switch u.Scheme {
+		case "udp":
+			host, err = hostWithDefaultPort(u.Host, "53")
+			dnsNetType = "" // UDP
+		case "tcp":
+			host, err = hostWithDefaultPort(u.Host, "53")
+			dnsNetType = "tcp" // TCP
+		case "tls":
+			host, err = hostWithDefaultPort(u.Host, "853")
+			dnsNetType = "tcp-tls" // DNS over TLS
+		default:
 			return nil, fmt.Errorf("DNS NameServer[%d] unsupport scheme: %s", idx, u.Scheme)
 		}
+		if err != nil {
+			return nil, fmt.Errorf("DNS NameServer[%d] format error: %s", idx, err.Error())
+		}
 
-		host, err := hostWithDefaultPort(u.Host, "853")
 		nameservers = append(
 			nameservers,
 			dns.NameServer{
-				Net:  "tcp-tls",
+				Net:  dnsNetType,
 				Addr: host,
 			},
 		)
 	}
-
 	return nameservers, nil
 }
 
@@ -427,13 +446,13 @@ func parseDNS(cfg rawDNS) (*DNS, error) {
 		Listen:       cfg.Listen,
 		EnhancedMode: cfg.EnhancedMode,
 	}
-
+	var err error
-	if nameserver, err := parseNameServer(cfg.NameServer); err == nil {
+	if dnsCfg.NameServer, err = parseNameServer(cfg.NameServer); err != nil {
-		dnsCfg.NameServer = nameserver
+		return nil, err
 	}
 
-	if fallback, err := parseNameServer(cfg.Fallback); err == nil {
+	if dnsCfg.Fallback, err = parseNameServer(cfg.Fallback); err != nil {
-		dnsCfg.Fallback = fallback
+		return nil, err
 	}
 
 	return dnsCfg, nil

constant/adapters.go

@@ -2,6 +2,7 @@ package constant
 
 import (
 	"net"
+	"time"
 )
 
 // Adapter Type
@@ -23,13 +24,27 @@ type ServerAdapter interface {
 	Close()
 }
 
-type Proxy interface {
+type ProxyAdapter interface {
 	Name() string
 	Type() AdapterType
-	Generator(metadata *Metadata) (net.Conn, error)
+	Dial(metadata *Metadata) (net.Conn, error)
+	Destroy()
 	MarshalJSON() ([]byte, error)
 }
 
+type DelayHistory struct {
+	Time  time.Time `json:"time"`
+	Delay uint16    `json:"delay"`
+}
+
+type Proxy interface {
+	ProxyAdapter
+	Alive() bool
+	DelayHistory() []DelayHistory
+	LastDelay() uint16
+	URLTest(url string) (uint16, error)
+}
+
 // AdapterType is enum of adapter type
 type AdapterType int
 

constant/path.go

@@ -27,6 +27,7 @@ func init() {
 	} else {
 		homedir = currentUser.HomeDir
 	}
+
 	homedir = P.Join(homedir, ".config", Name)
 	Path = &path{homedir: homedir}
 }

constant/rule.go

@@ -8,7 +8,7 @@ const (
 	GEOIP
 	IPCIDR
 	SourceIPCIDR
-	FINAL
+	MATCH
 )
 
 type RuleType int
@@ -27,8 +27,8 @@ func (rt RuleType) String() string {
 		return "IPCIDR"
 	case SourceIPCIDR:
 		return "SourceIPCIDR"
-	case FINAL:
+	case MATCH:
-		return "FINAL"
+		return "MATCH"
 	default:
 		return "Unknow"
 	}

constant/version.go

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

dns/client.go

@@ -12,7 +12,6 @@ import (
 	"github.com/Dreamacro/clash/common/cache"
 	"github.com/Dreamacro/clash/common/picker"
 	C "github.com/Dreamacro/clash/constant"
-	"github.com/Dreamacro/clash/log"
 
 	D "github.com/miekg/dns"
 	geoip2 "github.com/oschwald/geoip2-golang"
@@ -55,28 +54,21 @@ func (r *Resolver) Exchange(m *D.Msg) (msg *D.Msg, err error) {
 	cache, expireTime := r.cache.GetWithExpire(q.String())
 	if cache != nil {
 		msg = cache.(*D.Msg).Copy()
-		if len(msg.Answer) > 0 {
+		setMsgTTL(msg, uint32(expireTime.Sub(time.Now()).Seconds()))
-			ttl := uint32(expireTime.Sub(time.Now()).Seconds())
-			for _, answer := range msg.Answer {
-				answer.Header().Ttl = ttl
-			}
-		}
 		return
 	}
 	defer func() {
-		if msg != nil {
+		if msg == nil {
-			putMsgToCache(r.cache, q.String(), msg)
-			if r.mapping {
-				ips, err := r.msgToIP(msg)
-				if err != nil {
-					log.Debugln("[DNS] msg to ip error: %s", err.Error())
 			return
 		}
+
+		putMsgToCache(r.cache, q.String(), msg)
+		if r.mapping {
+			ips := r.msgToIP(msg)
 			for _, ip := range ips {
 				putMsgToCache(r.cache, ip.String(), msg)
 			}
 		}
-		}
 	}()
 
 	isIPReq := isIPRequest(q)
@@ -138,8 +130,7 @@ func (r *Resolver) resolveIP(m *D.Msg) (msg *D.Msg, err error) {
 			return nil, errors.New("GeoIP can't use")
 		}
 
-		ips, err := r.msgToIP(res.Msg)
+		if ips := r.msgToIP(res.Msg); len(ips) != 0 {
-		if err == nil {
 			if record, _ := mmdb.Country(ips[0]); record.Country.IsoCode == "CN" || record.Country.IsoCode == "" {
 				// release channel
 				go func() { <-fallbackMsg }()
@@ -172,18 +163,17 @@ func (r *Resolver) ResolveIP(host string) (ip net.IP, err error) {
 		return nil, err
 	}
 
-	var ips []net.IP
+	ips := r.msgToIP(msg)
-	ips, err = r.msgToIP(msg)
+	if len(ips) == 0 {
-	if err != nil {
+		return nil, errors.New("can't found ip")
-		return nil, err
 	}
 
 	ip = ips[0]
 	return
 }
 
-func (r *Resolver) msgToIP(msg *D.Msg) ([]net.IP, error) {
+func (r *Resolver) msgToIP(msg *D.Msg) []net.IP {
-	var ips []net.IP
+	ips := []net.IP{}
 
 	for _, answer := range msg.Answer {
 		switch ans := answer.(type) {
@@ -194,11 +184,7 @@ func (r *Resolver) msgToIP(msg *D.Msg) ([]net.IP, error) {
 		}
 	}
 
-	if len(ips) == 0 {
+	return ips
-		return nil, errors.New("Can't parse msg")
-	}
-
-	return ips, nil
 }
 
 func (r *Resolver) IPToHost(ip net.IP) (string, bool) {
@@ -248,6 +234,7 @@ func transform(servers []NameServer) []*nameserver {
 				TLSConfig: &tls.Config{
 					ClientSessionCache: globalSessionCache,
 				},
+				UDPSize: 4096,
 			},
 			Address: s.Addr,
 		})

dns/server.go

@@ -1,8 +1,10 @@
 package dns
 
 import (
+	"fmt"
 	"net"
 
+	"github.com/Dreamacro/clash/log"
 	D "github.com/miekg/dns"
 )
 
@@ -20,6 +22,11 @@ func (s *Server) ServeDNS(w D.ResponseWriter, r *D.Msg) {
 	msg, err := s.r.Exchange(r)
 
 	if err != nil {
+		if len(r.Question) > 0 {
+			q := r.Question[0]
+			qString := fmt.Sprintf("%s %s %s", q.Name, D.Class(q.Qclass).String(), D.Type(q.Qtype).String())
+			log.Debugln("[DNS Server] Exchange %s failed: %v", qString, err)
+		}
 		D.HandleFailed(w, r)
 		return
 	}
@@ -27,15 +34,20 @@ func (s *Server) ServeDNS(w D.ResponseWriter, r *D.Msg) {
 	w.WriteMsg(msg)
 }
 
-func ReCreateServer(addr string, resolver *Resolver) error {
+func (s *Server) setReslover(r *Resolver) {
-	if server.Server != nil {
+	s.r = r
-		server.Shutdown()
 }
 
+func ReCreateServer(addr string, resolver *Resolver) error {
 	if addr == address {
+		server.setReslover(resolver)
 		return nil
 	}
 
+	if server.Server != nil {
+		server.Shutdown()
+	}
+
 	_, port, err := net.SplitHostPort(addr)
 	if port == "0" || port == "" || err != nil {
 		return nil

dns/util.go

@@ -79,11 +79,31 @@ func (e EnhancedMode) String() string {
 }
 
 func putMsgToCache(c *cache.Cache, key string, msg *D.Msg) {
-	if len(msg.Answer) == 0 {
+	var ttl time.Duration
-		log.Debugln("[DNS] answer length is zero: %#v", msg)
+	if len(msg.Answer) != 0 {
+		ttl = time.Duration(msg.Answer[0].Header().Ttl) * time.Second
+	} else if len(msg.Ns) != 0 {
+		ttl = time.Duration(msg.Ns[0].Header().Ttl) * time.Second
+	} else if len(msg.Extra) != 0 {
+		ttl = time.Duration(msg.Extra[0].Header().Ttl) * time.Second
+	} else {
+		log.Debugln("[DNS] response msg error: %#v", msg)
 		return
 	}
 
-	ttl := time.Duration(msg.Answer[0].Header().Ttl) * time.Second
+	c.Put(key, msg.Copy(), ttl)
-	c.Put(key, msg, ttl)
+}
+
+func setMsgTTL(msg *D.Msg, ttl uint32) {
+	for _, answer := range msg.Answer {
+		answer.Header().Ttl = ttl
+	}
+
+	for _, ns := range msg.Ns {
+		ns.Header().Ttl = ttl
+	}
+
+	for _, extra := range msg.Extra {
+		extra.Header().Ttl = ttl
+	}
 }

hub/executor/executor.go

@@ -1,7 +1,6 @@
 package executor
 
 import (
-	adapters "github.com/Dreamacro/clash/adapters/outbound"
 	"github.com/Dreamacro/clash/config"
 	C "github.com/Dreamacro/clash/constant"
 	"github.com/Dreamacro/clash/dns"
@@ -66,14 +65,9 @@ func updateProxies(proxies map[string]C.Proxy) {
 	tunnel := T.Instance()
 	oldProxies := tunnel.Proxies()
 
-	// close old goroutine
+	// close proxy group goroutine
 	for _, proxy := range oldProxies {
-		switch raw := proxy.(type) {
+		proxy.Destroy()
-		case *adapters.URLTest:
-			raw.Close()
-		case *adapters.Fallback:
-			raw.Close()
-		}
 	}
 
 	tunnel.UpdateProxies(proxies)

hub/route/proxies.go

@@ -81,12 +81,11 @@ func updateProxy(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	proxy := r.Context().Value(CtxKeyProxy).(C.Proxy)
+	proxy := r.Context().Value(CtxKeyProxy).(*A.Proxy)
-
+	selector, ok := proxy.ProxyAdapter.(*A.Selector)
-	selector, ok := proxy.(*A.Selector)
 	if !ok {
 		render.Status(r, http.StatusBadRequest)
-		render.JSON(w, r, ErrBadRequest)
+		render.JSON(w, r, newError("Must be a Selector"))
 		return
 	}
 
@@ -111,9 +110,9 @@ func getProxyDelay(w http.ResponseWriter, r *http.Request) {
 
 	proxy := r.Context().Value(CtxKeyProxy).(C.Proxy)
 
-	sigCh := make(chan int16)
+	sigCh := make(chan uint16)
 	go func() {
-		t, err := A.DelayTest(proxy, url)
+		t, err := proxy.URLTest(url)
 		if err != nil {
 			sigCh <- 0
 		}

main.go

@@ -2,9 +2,11 @@ package main
 
 import (
 	"flag"
+	"fmt"
 	"os"
 	"os/signal"
 	"path/filepath"
+	"runtime"
 	"syscall"
 
 	"github.com/Dreamacro/clash/config"
@@ -15,15 +17,25 @@ import (
 )
 
 var (
+	version bool
 	homedir string
 )
 
 func init() {
 	flag.StringVar(&homedir, "d", "", "set configuration directory")
+	flag.BoolVar(&version, "v", false, "show current version of clash")
 	flag.Parse()
 }
 
 func main() {
+	if version {
+		fmt.Printf("Clash %s %s %s %s\n", C.Version, runtime.GOOS, runtime.GOARCH, C.BuildTime)
+		return
+	}
+
+	// enable tls 1.3 and remove when go 1.13
+	os.Setenv("GODEBUG", os.Getenv("GODEBUG")+",tls13=1")
+
 	if homedir != "" {
 		if !filepath.IsAbs(homedir) {
 			currentDir, _ := os.Getwd()

proxy/http/server.go

@@ -5,7 +5,7 @@ import (
 	"net"
 	"net/http"
 
-	"github.com/Dreamacro/clash/adapters/inbound"
+	adapters "github.com/Dreamacro/clash/adapters/inbound"
 	"github.com/Dreamacro/clash/log"
 	"github.com/Dreamacro/clash/tunnel"
 )
@@ -56,7 +56,7 @@ func (l *HttpListener) Address() string {
 func handleConn(conn net.Conn) {
 	br := bufio.NewReader(conn)
 	request, err := http.ReadRequest(br)
-	if err != nil {
+	if err != nil || request.URL.Host == "" {
 		conn.Close()
 		return
 	}

rules/final.go

@@ -4,28 +4,28 @@ import (
 	C "github.com/Dreamacro/clash/constant"
 )
 
-type Final struct {
+type Match struct {
 	adapter string
 }
 
-func (f *Final) RuleType() C.RuleType {
+func (f *Match) RuleType() C.RuleType {
-	return C.FINAL
+	return C.MATCH
 }
 
-func (f *Final) IsMatch(metadata *C.Metadata) bool {
+func (f *Match) IsMatch(metadata *C.Metadata) bool {
 	return true
 }
 
-func (f *Final) Adapter() string {
+func (f *Match) Adapter() string {
 	return f.adapter
 }
 
-func (f *Final) Payload() string {
+func (f *Match) Payload() string {
 	return ""
 }
 
-func NewFinal(adapter string) *Final {
+func NewMatch(adapter string) *Match {
-	return &Final{
+	return &Match{
 		adapter: adapter,
 	}
 }

rules/ipcidr.go

@@ -38,6 +38,7 @@ func (i *IPCIDR) Payload() string {
 func NewIPCIDR(s string, adapter string, isSourceIP bool) *IPCIDR {
 	_, ipnet, err := net.ParseCIDR(s)
 	if err != nil {
+		return nil
 	}
 	return &IPCIDR{
 		ipnet:      ipnet,

tunnel/connection.go

@@ -25,12 +25,9 @@ func (t *Tunnel) handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
 	conn := newTrafficTrack(outbound, t.traffic)
 	req := request.R
 	host := req.Host
-	keepalive := true
 
 	for {
-		if strings.ToLower(req.Header.Get("Connection")) == "close" {
+		keepAlive := strings.TrimSpace(strings.ToLower(req.Header.Get("Proxy-Connection"))) == "keep-alive"
-			keepalive = false
-		}
 
 		req.Header.Set("Connection", "close")
 		req.RequestURI = ""
@@ -58,7 +55,7 @@ func (t *Tunnel) handleHTTP(request *adapters.HTTPAdapter, outbound net.Conn) {
 			break
 		}
 
-		if !keepalive {
+		if !keepAlive {
 			break
 		}
 

tunnel/tunnel.go

@@ -115,6 +115,11 @@ func (t *Tunnel) handleConn(localConn C.ServerAdapter) {
 	defer localConn.Close()
 	metadata := localConn.Metadata()
 
+	if !metadata.Valid() {
+		log.Warnln("[Metadata] not valid: %#v", metadata)
+		return
+	}
+
 	if t.needLookupIP(metadata) {
 		host, exist := t.resolver.IPToHost(*metadata.IP)
 		if exist {
@@ -138,12 +143,7 @@ func (t *Tunnel) handleConn(localConn C.ServerAdapter) {
 		}
 	}
 
-	if !metadata.Valid() {
+	remoConn, err := proxy.Dial(metadata)
-		log.Warnln("[Metadata] not valid: %#v", metadata)
-		return
-	}
-
-	remoConn, err := proxy.Generator(metadata)
 	if err != nil {
 		log.Warnln("Proxy[%s] connect [%s --> %s] error: %s", proxy.Name(), metadata.SourceIP.String(), metadata.String(), err.Error())
 		return