upgrade to kcp-go@v5.5.14

commit 58d2c9d3468aa1c04f8cb60f0680186b6330804c
Author: xtaci <daniel820313@gmail.com>
Date:   Thu Dec 26 17:40:36 2019 +0800

    combine smux v1 & v2

.travis.yml

@@ -1,7 +1,5 @@
 language: go
 go:
-    - 1.11.x
-    - 1.12.x
     - 1.13.x
 before_install:
     - go get github.com/mattn/goveralls

Dockerfile

@@ -1,4 +1,4 @@
-FROM golang:alpine as builder
+FROM golang:1.14.2-alpine3.11 as builder
 MAINTAINER xtaci <daniel820313@gmail.com>
 ENV GO111MODULE=on
 RUN apk update && \
@@ -6,7 +6,8 @@ RUN apk update && \
     apk add git gcc libc-dev linux-headers
 RUN go get -ldflags "-X main.VERSION=$(date -u +%Y%m%d) -s -w" github.com/xtaci/kcptun/client && go get -ldflags "-X main.VERSION=$(date -u +%Y%m%d) -s -w" github.com/xtaci/kcptun/server
 
-FROM alpine:3.9
+FROM alpine:3.11
+RUN apk add --no-cache iptables
 COPY --from=builder /go/bin /bin
 EXPOSE 29900/udp
 EXPOSE 12948

README.md

@@ -1,20 +1,18 @@
 # <img src="logo.png" alt="kcptun" height="54px" /> 
 
-[![Release][13]][14] [![Powered][17]][18] [![MIT licensed][11]][12] [![Build Status][3]][4] [![Go Report Card][5]][6] [![Downloads][15]][16] [![Docker][1]][2]
+[![Release][13]][14] [![Powered][17]][18] [![MIT licensed][11]][12] [![Build Status][3]][4] [![Go Report Card][5]][6] [![Downloads][15]][16] [![Docker][1]][2] 
 
-[1]: https://images.microbadger.com/badges/image/xtaci/kcptun.svg
-[2]: https://microbadger.com/images/xtaci/kcptun
+[1]: https://img.shields.io/docker/pulls/xtaci/kcptun
+[2]: https://hub.docker.com/r/xtaci/kcptun
 [3]: https://travis-ci.org/xtaci/kcptun.svg?branch=master
 [4]: https://travis-ci.org/xtaci/kcptun
 [5]: https://goreportcard.com/badge/github.com/xtaci/kcptun
 [6]: https://goreportcard.com/report/github.com/xtaci/kcptun
-[7]: https://img.shields.io/badge/license-MIT-blue.svg
-[8]: https://raw.githubusercontent.com/xtaci/kcptun/master/LICENSE.md
-[11]: https://img.shields.io/badge/license-MIT-blue.svg
+[11]: https://img.shields.io/github/license/xtaci/kcptun
 [12]: LICENSE.md
-[13]: https://img.shields.io/github/release/xtaci/kcptun.svg
+[13]: https://img.shields.io/github/v/release/xtaci/kcptun?color=orange
 [14]: https://github.com/xtaci/kcptun/releases/latest
-[15]: https://img.shields.io/github/downloads/xtaci/kcptun/total.svg?maxAge=1800
+[15]: https://img.shields.io/github/downloads/xtaci/kcptun/total.svg?maxAge=1800&color=orange
 [16]: https://github.com/xtaci/kcptun/releases
 [17]: https://img.shields.io/badge/KCP-Powered-blue.svg
 [18]: https://github.com/skywind3000/kcp
@@ -23,6 +21,15 @@
 
 > *Disclaimer: kcptun maintains a single website — [github.com/xtaci/kcptun](https://github.com/xtaci/kcptun). Any websites other than [github.com/xtaci/kcptun](https://github.com/xtaci/kcptun) are not endorsed by xtaci.*
 
+### Requirements
+
+| Target | Minimum | Recommended |
+| --- | --- | --- |
+| System | aix darwin dragonfly freebsd linux netbsd openbsd solaris windows | linux |
+| Memory | >20MB | >32MB |
+| CPU | ANY | amd64 with AES-NI & AVX2 |
+
+
 ### QuickStart
 
 Increase the number of open files on your server, as:
@@ -59,11 +66,13 @@ which tunnels the original connection:
 
 > Application -> Target Server(8388/tcp) 
 
-### Install from source
+### Build from source
 
 ```
-$ export GO111MODULE=on
-$ go get -u github.com/xtaci/kcptun/...
+$ git clone https://github.com/xtaci/kcptun.git
+$ cd kcptun
+$ ./build-release.sh
+$ cd build
 ```
 
 All precompiled releases are genereated from `build-release.sh` script.

build-release.sh

@@ -6,11 +6,8 @@ cd $BUILD_DIR
 
 sum="sha1sum"
 
-if [ "$GO111MODULE" != "on" ]; then
-	echo "GO111MODULE is off"
-else
-	echo "GO111MODULE is on"
-fi 
+export GO111MODULE=on
+echo "Setting GO111MODULE to" $GO111MODULE
 
 if ! hash sha1sum 2>/dev/null; then
 	if ! hash shasum 2>/dev/null; then

client/dial.go

@@ -2,7 +2,7 @@ package main
 
 import (
 	"github.com/pkg/errors"
-	kcp "github.com/xtaci/kcp-go"
+	kcp "github.com/xtaci/kcp-go/v5"
 	"github.com/xtaci/tcpraw"
 )
 

client/main.go

@@ -8,39 +8,38 @@ import (
 	"math/rand"
 	"net"
 	"os"
-	"sync"
 	"time"
 
 	"golang.org/x/crypto/pbkdf2"
 
 	"github.com/pkg/errors"
 	"github.com/urfave/cli"
-	kcp "github.com/xtaci/kcp-go"
+	kcp "github.com/xtaci/kcp-go/v5"
 	"github.com/xtaci/kcptun/generic"
 	"github.com/xtaci/smux"
-	smuxv2 "github.com/xtaci/smux/v2"
 )
 
-// SALT is use for pbkdf2 key expansion
-const SALT = "kcp-go"
-
-// maximum supported smux version
-const maxSmuxVer = 2
+const (
+	// SALT is use for pbkdf2 key expansion
+	SALT = "kcp-go"
+	// maximum supported smux version
+	maxSmuxVer = 2
+	// stream copy buffer size
+	bufSize = 4096
+)
 
 // VERSION is injected by buildflags
 var VERSION = "SELFBUILD"
 
-// A pool for stream copying
-var xmitBuf sync.Pool
-
-func handleClient(mux generic.Mux, p1 net.Conn, quiet bool) {
+// handleClient aggregates connection p1 on mux with 'writeLock'
+func handleClient(session *smux.Session, p1 net.Conn, quiet bool) {
 	logln := func(v ...interface{}) {
 		if !quiet {
 			log.Println(v...)
 		}
 	}
 	defer p1.Close()
-	p2, err := mux.Open()
+	p2, err := session.OpenStream()
 	if err != nil {
 		logln(err)
 		return
@@ -48,42 +47,23 @@ func handleClient(mux generic.Mux, p1 net.Conn, quiet bool) {
 
 	defer p2.Close()
 
-	if s2, ok := p2.(generic.Stream); ok {
-		logln("stream opened", "in:", p1.RemoteAddr(), "out:", fmt.Sprint(s2.RemoteAddr(), "(", s2.ID(), ")"))
-		defer logln("stream closed", "in:", p1.RemoteAddr(), "out:", fmt.Sprint(s2.RemoteAddr(), "(", s2.ID(), ")"))
-	}
+	logln("stream opened", "in:", p1.RemoteAddr(), "out:", fmt.Sprint(p2.RemoteAddr(), "(", p2.ID(), ")"))
+	defer logln("stream closed", "in:", p1.RemoteAddr(), "out:", fmt.Sprint(p2.RemoteAddr(), "(", p2.ID(), ")"))
 
 	// start tunnel & wait for tunnel termination
-	streamCopy := func(dst io.Writer, src io.ReadCloser) chan struct{} {
-		die := make(chan struct{})
-		go func() {
-			buf := xmitBuf.Get().([]byte)
-			if _, err := generic.CopyBuffer(dst, src, buf); err != nil {
-				if s2, ok := p2.(generic.Stream); ok {
-					// verbose error handling
-					cause := err
-					if e, ok := err.(interface{ Cause() error }); ok {
-						cause = e.Cause()
-					}
-
-					switch cause {
-					case smux.ErrInvalidProtocol:
-						log.Println("smux version:1", err, "in:", p1.RemoteAddr(), "out:", fmt.Sprint(s2.RemoteAddr(), "(", s2.ID(), ")"))
-					case smuxv2.ErrInvalidProtocol:
-						log.Println("smux version:2", err, "in:", p1.RemoteAddr(), "out:", fmt.Sprint(s2.RemoteAddr(), "(", s2.ID(), ")"))
-					}
-				}
+	streamCopy := func(dst io.Writer, src io.ReadCloser) {
+		if _, err := generic.Copy(dst, src); err != nil {
+			// report protocol error
+			if err == smux.ErrInvalidProtocol {
+				log.Println("smux", err, "in:", p1.RemoteAddr(), "out:", fmt.Sprint(p2.RemoteAddr(), "(", p2.ID(), ")"))
 			}
-			xmitBuf.Put(buf)
-			close(die)
-		}()
-		return die
+		}
+		p1.Close()
+		p2.Close()
 	}
 
-	select {
-	case <-streamCopy(p1, p2):
-	case <-streamCopy(p2, p1):
-	}
+	go streamCopy(p1, p2)
+	streamCopy(p2, p1)
 }
 
 func checkError(err error) {
@@ -99,9 +79,6 @@ func main() {
 		// add more log flags for debugging
 		log.SetFlags(log.LstdFlags | log.Lshortfile)
 	}
-	xmitBuf.New = func() interface{} {
-		return make([]byte, 32768)
-	}
 
 	myApp := cli.NewApp()
 	myApp.Name = "kcptun"
@@ -387,7 +364,7 @@ func main() {
 			block, _ = kcp.NewAESBlockCrypt(pass)
 		}
 
-		createConn := func() (generic.Mux, error) {
+		createConn := func() (*smux.Session, error) {
 			kcpconn, err := dial(&config, block)
 			if err != nil {
 				return nil, errors.Wrap(err, "dial()")
@@ -409,47 +386,31 @@ func main() {
 				log.Println("SetWriteBuffer:", err)
 			}
 			log.Println("smux version:", config.SmuxVer, "on connection:", kcpconn.LocalAddr(), "->", kcpconn.RemoteAddr())
-			switch config.SmuxVer {
-			case 1:
-				smuxConfig := smux.DefaultConfig()
-				smuxConfig.MaxReceiveBuffer = config.SmuxBuf
-				smuxConfig.KeepAliveInterval = time.Duration(config.KeepAlive) * time.Second
+			smuxConfig := smux.DefaultConfig()
+			smuxConfig.Version = config.SmuxVer
+			smuxConfig.MaxReceiveBuffer = config.SmuxBuf
+			smuxConfig.MaxStreamBuffer = config.StreamBuf
+			smuxConfig.KeepAliveInterval = time.Duration(config.KeepAlive) * time.Second
 
-				// stream multiplex
-				var session *smux.Session
-				if config.NoComp {
-					session, err = smux.Client(kcpconn, smuxConfig)
-				} else {
-					session, err = smux.Client(generic.NewCompStream(kcpconn), smuxConfig)
-				}
-				if err != nil {
-					return nil, errors.Wrap(err, "createConn()")
-				}
-				return session, nil
-			case 2:
-				smuxConfig := smuxv2.DefaultConfig()
-				smuxConfig.MaxReceiveBuffer = config.SmuxBuf
-				smuxConfig.MaxStreamBuffer = config.StreamBuf
-				smuxConfig.KeepAliveInterval = time.Duration(config.KeepAlive) * time.Second
-
-				// stream multiplex
-				var session *smuxv2.Session
-				if config.NoComp {
-					session, err = smuxv2.Client(kcpconn, smuxConfig)
-				} else {
-					session, err = smuxv2.Client(generic.NewCompStream(kcpconn), smuxConfig)
-				}
-				if err != nil {
-					return nil, errors.Wrap(err, "createConn()")
-				}
-				return session, nil
-			default:
-				panic("incorrect smux version")
+			if err := smux.VerifyConfig(smuxConfig); err != nil {
+				log.Fatalf("%+v", err)
 			}
+
+			// stream multiplex
+			var session *smux.Session
+			if config.NoComp {
+				session, err = smux.Client(kcpconn, smuxConfig)
+			} else {
+				session, err = smux.Client(generic.NewCompStream(kcpconn), smuxConfig)
+			}
+			if err != nil {
+				return nil, errors.Wrap(err, "createConn()")
+			}
+			return session, nil
 		}
 
 		// wait until a connection is ready
-		waitConn := func() generic.Mux {
+		waitConn := func() *smux.Session {
 			for {
 				if session, err := createConn(); err == nil {
 					return session
@@ -462,7 +423,7 @@ func main() {
 
 		numconn := uint16(config.Conn)
 		muxes := make([]struct {
-			session generic.Mux
+			session *smux.Session
 			ttl     time.Time
 		}, numconn)
 
@@ -471,7 +432,7 @@ func main() {
 			muxes[k].ttl = time.Now().Add(time.Duration(config.AutoExpire) * time.Second)
 		}
 
-		chScavenger := make(chan generic.Mux, 128)
+		chScavenger := make(chan *smux.Session, 128)
 		go scavenger(chScavenger, config.ScavengeTTL)
 		go generic.SnmpLogger(config.SnmpLog, config.SnmpPeriod)
 		rr := uint16(0)
@@ -497,11 +458,11 @@ func main() {
 }
 
 type scavengeSession struct {
-	session generic.Mux
+	session *smux.Session
 	ts      time.Time
 }
 
-func scavenger(ch chan generic.Mux, ttl int) {
+func scavenger(ch chan *smux.Session, ttl int) {
 	ticker := time.NewTicker(time.Second)
 	defer ticker.Stop()
 	var sessionList []scavengeSession

client/signal.go

@@ -8,7 +8,7 @@ import (
 	"os/signal"
 	"syscall"
 
-	kcp "github.com/xtaci/kcp-go"
+	kcp "github.com/xtaci/kcp-go/v5"
 )
 
 func init() {

examples/kcptun.service

@@ -0,0 +1,16 @@
+Description=kcptun
+
+Wants=network.target
+After=syslog.target network-online.target
+
+[Service]
+Type=simple
+Environment=GOGC=20
+ExecStart=/home/user/client_linux_amd64 -c /home/user/local.json
+Restart=on-failure
+RestartSec=10
+KillMode=process
+LimitNOFILE=65536
+
+[Install]
+WantedBy=multi-user.target

generic/copy.go

@@ -1,36 +1,24 @@
 package generic
 
-import "io"
+import (
+	"io"
+)
 
-// io.CopyBuffer has extra tests for interface like io.ReaderFrom and io.WriterTo
-// which is not efficient in memory management from tests
-func CopyBuffer(dst io.Writer, src io.Reader, buf []byte) (written int64, err error) {
-	if buf != nil && len(buf) == 0 {
-		panic("empty buffer in copyBuffer")
+const bufSize = 4096
+
+// Memory optimized io.Copy function specified for this library
+func Copy(dst io.Writer, src io.Reader) (written int64, err error) {
+	// If the reader has a WriteTo method, use it to do the copy.
+	// Avoids an allocation and a copy.
+	if wt, ok := src.(io.WriterTo); ok {
+		return wt.WriteTo(dst)
+	}
+	// Similarly, if the writer has a ReadFrom method, use it to do the copy.
+	if rt, ok := dst.(io.ReaderFrom); ok {
+		return rt.ReadFrom(src)
 	}
 
-	for {
-		nr, er := src.Read(buf)
-		if nr > 0 {
-			nw, ew := dst.Write(buf[0:nr])
-			if nw > 0 {
-				written += int64(nw)
-			}
-			if ew != nil {
-				err = ew
-				break
-			}
-			if nr != nw {
-				err = io.ErrShortWrite
-				break
-			}
-		}
-		if er != nil {
-			if er != io.EOF {
-				err = er
-			}
-			break
-		}
-	}
-	return written, err
+	// fallback to standard io.CopyBuffer
+	buf := make([]byte, bufSize)
+	return io.CopyBuffer(dst, src, buf)
 }

generic/mux.go

@@ -1,21 +0,0 @@
-package generic
-
-import (
-	"io"
-	"net"
-)
-
-type Mux interface {
-	Open() (io.ReadWriteCloser, error)
-	Accept() (io.ReadWriteCloser, error)
-	IsClosed() bool
-	NumStreams() int
-	RemoteAddr() net.Addr
-	Close() error
-}
-
-type Stream interface {
-	io.ReadWriteCloser
-	ID() uint32
-	RemoteAddr() net.Addr
-}

generic/snmp.go

@@ -8,7 +8,7 @@ import (
 	"path/filepath"
 	"time"
 
-	"github.com/xtaci/kcp-go"
+	kcp "github.com/xtaci/kcp-go/v5"
 )
 
 func SnmpLogger(path string, interval int) {

go.mod

@@ -4,21 +4,19 @@ require (
 	github.com/coreos/go-iptables v0.4.2 // indirect
 	github.com/golang/snappy v0.0.1
 	github.com/google/gopacket v1.1.17 // indirect
-	github.com/klauspost/cpuid v1.2.1 // indirect
-	github.com/klauspost/reedsolomon v1.9.2 // indirect
-	github.com/pkg/errors v0.8.1
+	github.com/klauspost/cpuid v1.2.3 // indirect
+	github.com/pkg/errors v0.9.1
 	github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161 // indirect
-	github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b // indirect
-	github.com/tjfoc/gmsm v1.0.1 // indirect
+	github.com/templexxx/xor v0.0.0-20191217153810-f85b25db303b // indirect
+	github.com/tjfoc/gmsm v1.3.0 // indirect
 	github.com/urfave/cli v1.21.0
-	github.com/xtaci/kcp-go v5.4.16+incompatible
-	github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae // indirect
-	github.com/xtaci/smux v1.4.4
-	github.com/xtaci/smux/v2 v2.0.11
+	github.com/xtaci/kcp-go v5.4.20+incompatible // indirect
+	github.com/xtaci/kcp-go/v5 v5.5.14
+	github.com/xtaci/smux v1.5.14
 	github.com/xtaci/tcpraw v1.2.25
-	golang.org/x/crypto v0.0.0-20190909091759-094676da4a83
-	golang.org/x/net v0.0.0-20190909003024-a7b16738d86b // indirect
-	golang.org/x/sys v0.0.0-20190910064555-bbd175535a8b // indirect
+	golang.org/x/crypto v0.0.0-20200320181102-891825fb96df
+	golang.org/x/net v0.0.0-20200320220750-118fecf932d8 // indirect
+	golang.org/x/sys v0.0.0-20200321134203-328b4cd54aae // indirect
 )
 
-go 1.13
+go 1.14

go.sum

@@ -5,47 +5,62 @@ github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/gopacket v1.1.17 h1:rMrlX2ZY2UbvT+sdz3+6J+pp2z+msCq9MxTU6ymxbBY=
 github.com/google/gopacket v1.1.17/go.mod h1:UdDNZ1OO62aGYVnPhxT1U6aI7ukYtA/kB8vaU0diBUM=
-github.com/klauspost/cpuid v1.2.1 h1:vJi+O/nMdFt0vqm8NZBI6wzALWdA2X+egi0ogNyrC/w=
-github.com/klauspost/cpuid v1.2.1/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
-github.com/klauspost/reedsolomon v1.9.2 h1:E9CMS2Pqbv+C7tsrYad4YC9MfhnMVWhMRsTi7U0UB18=
-github.com/klauspost/reedsolomon v1.9.2/go.mod h1:CwCi+NUr9pqSVktrkN+Ondf06rkhYZ/pcNv7fu+8Un4=
+github.com/klauspost/cpuid v1.2.2 h1:1xAgYebNnsb9LKCdLOvFWtAxGU/33mjJtyOVbmUa0Us=
+github.com/klauspost/cpuid v1.2.2/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
+github.com/klauspost/cpuid v1.2.3 h1:CCtW0xUnWGVINKvE/WWOYKdsPV6mawAtvQuSl8guwQs=
+github.com/klauspost/cpuid v1.2.3/go.mod h1:Pj4uuM528wm8OyEC2QMXAi2YiTZ96dNQPGgoMS4s3ek=
+github.com/klauspost/reedsolomon v1.9.3 h1:N/VzgeMfHmLc+KHMD1UL/tNkfXAt8FnUqlgXGIduwAY=
+github.com/klauspost/reedsolomon v1.9.3/go.mod h1:CwCi+NUr9pqSVktrkN+Ondf06rkhYZ/pcNv7fu+8Un4=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/pkg/errors v0.9.1 h1:FEBLx1zS214owpjy7qsBeixbURkuhQAwrK5UwLGTwt4=
+github.com/pkg/errors v0.9.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
+github.com/templexxx/cpu v0.0.1 h1:hY4WdLOgKdc8y13EYklu9OUTXik80BkxHoWvTO6MQQY=
+github.com/templexxx/cpu v0.0.1/go.mod h1:w7Tb+7qgcAlIyX4NhLuDKt78AHA5SzPmq0Wj6HiEnnk=
 github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161 h1:89CEmDvlq/F7SJEOqkIdNDGJXrQIhuIx9D2DBXjavSU=
 github.com/templexxx/cpufeat v0.0.0-20180724012125-cef66df7f161/go.mod h1:wM7WEvslTq+iOEAMDLSzhVuOt5BRZ05WirO+b09GHQU=
-github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b h1:mnG1fcsIB1d/3vbkBak2MM0u+vhGhlQwpeimUi7QncM=
-github.com/templexxx/xor v0.0.0-20181023030647-4e92f724b73b/go.mod h1:5XA7W9S6mni3h5uvOC75dA3m9CCCaS83lltmc0ukdi4=
+github.com/templexxx/xor v0.0.0-20191217153810-f85b25db303b h1:fj5tQ8acgNUr6O8LEplsxDhUIe2573iLkJc+PqnzZTI=
+github.com/templexxx/xor v0.0.0-20191217153810-f85b25db303b/go.mod h1:5XA7W9S6mni3h5uvOC75dA3m9CCCaS83lltmc0ukdi4=
+github.com/templexxx/xorsimd v0.4.1 h1:iUZcywbOYDRAZUasAs2eSCUW8eobuZDy0I9FJiORkVg=
+github.com/templexxx/xorsimd v0.4.1/go.mod h1:W+ffZz8jJMH2SXwuKu9WhygqBMbFnp14G2fqEr8qaNo=
 github.com/tjfoc/gmsm v1.0.1 h1:R11HlqhXkDospckjZEihx9SW/2VW0RgdwrykyWMFOQU=
 github.com/tjfoc/gmsm v1.0.1/go.mod h1:XxO4hdhhrzAd+G4CjDqaOkd0hUzmtPR/d3EiBBMn/wc=
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 github.com/urfave/cli v1.21.0 h1:wYSSj06510qPIzGSua9ZqsncMmWE3Zr55KBERygyrxE=
 github.com/urfave/cli v1.21.0/go.mod h1:lxDj6qX9Q6lWQxIrbrT0nwecwUtRnhVZAJjJZrVUZZQ=
-github.com/xtaci/kcp-go v5.4.13+incompatible h1:s6ba2XTw8lAj+s6AQNob25dCvWDgwE+U1QpEVBUoYy8=
-github.com/xtaci/kcp-go v5.4.13+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.4.14+incompatible h1:kQZr/ngKQtYrgXSUxwF4A59mTMzUp0BDmtWIRuXYoqg=
-github.com/xtaci/kcp-go v5.4.14+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.4.15+incompatible h1:QLDulPaKjT4k4cGeviyC1mt00gwJ3r5epx8yCw6ACEc=
-github.com/xtaci/kcp-go v5.4.15+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
-github.com/xtaci/kcp-go v5.4.16+incompatible h1:/L7UP4P4H/oXpMnrb2W9oOxCMVpjPi3FJeMJmgN+SUE=
-github.com/xtaci/kcp-go v5.4.16+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
+github.com/xtaci/kcp-go v5.4.20+incompatible h1:TN1uey3Raw0sTz0Fg8GkfM0uH3YwzhnZWQ1bABv5xAg=
+github.com/xtaci/kcp-go v5.4.20+incompatible/go.mod h1:bN6vIwHQbfHaHtFpEssmWsN45a+AZwO7eyRCmEIbtvE=
+github.com/xtaci/kcp-go/v5 v5.5.11 h1:wYvoREAp6bG3sYwtxhY1QelbB/1fNggCtkt2DwqFj2M=
+github.com/xtaci/kcp-go/v5 v5.5.11/go.mod h1:Oyw+zrBrO58urX1AaWV+2RynthEKcs+qrRAh0Q8YpdU=
+github.com/xtaci/kcp-go/v5 v5.5.14-0.20200701100455-43d2c47d8ac1 h1:bnQj12vKzlMDxNGzFTj7ZDgXXpUpEQsX9mF/s7hD68o=
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+github.com/xtaci/kcp-go/v5 v5.5.14 h1:YODIwvTyZmOTj3SduJeIcQPxthDoHllMm8YIBlK44Ik=
+github.com/xtaci/kcp-go/v5 v5.5.14/go.mod h1:H0T/EJ+lPNytnFYsKLH0JHUtiwZjG3KXlTM6c+Q4YUo=
 github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae h1:J0GxkO96kL4WF+AIT3M4mfUVinOCPgf2uUWYFUzN0sM=
 github.com/xtaci/lossyconn v0.0.0-20190602105132-8df528c0c9ae/go.mod h1:gXtu8J62kEgmN++bm9BVICuT/e8yiLI2KFobd/TRFsE=
-github.com/xtaci/smux v1.4.4 h1:FukIfahko+KHhS9Gxppkp6756opZymvPOLNmpny1is4=
-github.com/xtaci/smux v1.4.4/go.mod h1:LuA3S0xssf4fmGRJ7ow3EehgmDUzib4EcobaFNKvlMA=
-github.com/xtaci/smux/v2 v2.0.11 h1:thVWmgGRciZ8iaATwpY2B/51aHzmMI6wrF7DfcJSckU=
-github.com/xtaci/smux/v2 v2.0.11/go.mod h1:Iqy5a3Gax2p7WCKHOHkSNo/COthNFXd3/vqrcKNtzqI=
+github.com/xtaci/smux v1.5.14 h1:1j+zJYDZRv9FHaWqCJfH5RPizIm0fSzJIFbfVn8zsfg=
+github.com/xtaci/smux v1.5.14/go.mod h1:OMlQbT5vcgl2gb49mFkYo6SMf+zP3rcjcwQz7ZU7IGY=
 github.com/xtaci/tcpraw v1.2.25 h1:VDlqo0op17JeXBM6e2G9ocCNLOJcw9mZbobMbJjo0vk=
 github.com/xtaci/tcpraw v1.2.25/go.mod h1:dKyZ2V75s0cZ7cbgJYdxPvms7af0joIeOyx1GgJQbLk=
 golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
-golang.org/x/crypto v0.0.0-20190909091759-094676da4a83 h1:mgAKeshyNqWKdENOnQsg+8dRTwZFIwFaO3HNl52sweA=
-golang.org/x/crypto v0.0.0-20190909091759-094676da4a83/go.mod h1:yigFU9vqHzYiE8UmvKecakEJjdnWj3jj499lnFckfCI=
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 golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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server/main.go

@@ -16,25 +16,24 @@ import (
 	"golang.org/x/crypto/pbkdf2"
 
 	"github.com/urfave/cli"
-	kcp "github.com/xtaci/kcp-go"
+	kcp "github.com/xtaci/kcp-go/v5"
 	"github.com/xtaci/kcptun/generic"
 	"github.com/xtaci/smux"
-	smuxv2 "github.com/xtaci/smux/v2"
 	"github.com/xtaci/tcpraw"
 )
 
-// SALT is use for pbkdf2 key expansion
-const SALT = "kcp-go"
-
-// maximum supported smux version
-const maxSmuxVer = 2
+const (
+	// SALT is use for pbkdf2 key expansion
+	SALT = "kcp-go"
+	// maximum supported smux version
+	maxSmuxVer = 2
+	// stream copy buffer size
+	bufSize = 4096
+)
 
 // VERSION is injected by buildflags
 var VERSION = "SELFBUILD"
 
-// A pool for stream copying
-var xmitBuf sync.Pool
-
 // handle multiplex-ed connection
 func handleMux(conn net.Conn, config *Config) {
 	// check if target is unix domain socket
@@ -45,45 +44,27 @@ func handleMux(conn net.Conn, config *Config) {
 	log.Println("smux version:", config.SmuxVer, "on connection:", conn.LocalAddr(), "->", conn.RemoteAddr())
 
 	// stream multiplex
-	var muxer generic.Mux
-	switch config.SmuxVer {
-	case 1:
-		smuxConfig := smux.DefaultConfig()
-		smuxConfig.MaxReceiveBuffer = config.SmuxBuf
-		smuxConfig.KeepAliveInterval = time.Duration(config.KeepAlive) * time.Second
+	smuxConfig := smux.DefaultConfig()
+	smuxConfig.Version = config.SmuxVer
+	smuxConfig.MaxReceiveBuffer = config.SmuxBuf
+	smuxConfig.MaxStreamBuffer = config.StreamBuf
+	smuxConfig.KeepAliveInterval = time.Duration(config.KeepAlive) * time.Second
 
-		mux, err := smux.Server(conn, smuxConfig)
-		if err != nil {
-			log.Println(err)
-			return
-		}
-		defer mux.Close()
-		muxer = mux
-	case 2:
-		smuxConfig := smuxv2.DefaultConfig()
-		smuxConfig.MaxReceiveBuffer = config.SmuxBuf
-		smuxConfig.MaxStreamBuffer = config.StreamBuf
-		smuxConfig.KeepAliveInterval = time.Duration(config.KeepAlive) * time.Second
-
-		mux, err := smuxv2.Server(conn, smuxConfig)
-		if err != nil {
-			log.Println(err)
-			return
-		}
-		defer mux.Close()
-		muxer = mux
-	default:
-		panic("incorrect smux version")
+	mux, err := smux.Server(conn, smuxConfig)
+	if err != nil {
+		log.Println(err)
+		return
 	}
+	defer mux.Close()
 
 	for {
-		stream, err := muxer.Accept()
+		stream, err := mux.AcceptStream()
 		if err != nil {
 			log.Println(err)
 			return
 		}
 
-		go func(p1 io.ReadWriteCloser) {
+		go func(p1 *smux.Stream) {
 			var p2 net.Conn
 			var err error
 			if !isUnix {
@@ -102,7 +83,7 @@ func handleMux(conn net.Conn, config *Config) {
 	}
 }
 
-func handleClient(p1 io.ReadWriteCloser, p2 net.Conn, quiet bool) {
+func handleClient(p1 *smux.Stream, p2 net.Conn, quiet bool) {
 	logln := func(v ...interface{}) {
 		if !quiet {
 			log.Println(v...)
@@ -112,42 +93,22 @@ func handleClient(p1 io.ReadWriteCloser, p2 net.Conn, quiet bool) {
 	defer p1.Close()
 	defer p2.Close()
 
-	if s1, ok := p1.(generic.Stream); ok {
-		logln("stream opened", "in:", fmt.Sprint(s1.RemoteAddr(), "(", s1.ID(), ")"), "out:", p2.RemoteAddr())
-		defer logln("stream closed", "in:", fmt.Sprint(s1.RemoteAddr(), "(", s1.ID(), ")"), "out:", p2.RemoteAddr())
-	}
+	logln("stream opened", "in:", fmt.Sprint(p1.RemoteAddr(), "(", p1.ID(), ")"), "out:", p2.RemoteAddr())
+	defer logln("stream closed", "in:", fmt.Sprint(p1.RemoteAddr(), "(", p1.ID(), ")"), "out:", p2.RemoteAddr())
 
 	// start tunnel & wait for tunnel termination
-	streamCopy := func(dst io.Writer, src io.ReadCloser) chan struct{} {
-		die := make(chan struct{})
-		go func() {
-			buf := xmitBuf.Get().([]byte)
-			if _, err := generic.CopyBuffer(dst, src, buf); err != nil {
-				if s1, ok := p1.(generic.Stream); ok {
-					// verbose error handling
-					cause := err
-					if e, ok := err.(interface{ Cause() error }); ok {
-						cause = e.Cause()
-					}
-
-					switch cause {
-					case smux.ErrInvalidProtocol:
-						log.Println("smux version:1", err, "in:", fmt.Sprint(s1.RemoteAddr(), "(", s1.ID(), ")"), "out:", p2.RemoteAddr())
-					case smuxv2.ErrInvalidProtocol:
-						log.Println("smux version:2", err, "in:", fmt.Sprint(s1.RemoteAddr(), "(", s1.ID(), ")"), "out:", p2.RemoteAddr())
-					}
-				}
+	streamCopy := func(dst io.Writer, src io.ReadCloser) {
+		if _, err := generic.Copy(dst, src); err != nil {
+			if err == smux.ErrInvalidProtocol {
+				log.Println("smux", err, "in:", fmt.Sprint(p1.RemoteAddr(), "(", p1.ID(), ")"), "out:", p2.RemoteAddr())
 			}
-			xmitBuf.Put(buf)
-			close(die)
-		}()
-		return die
+		}
+		p1.Close()
+		p2.Close()
 	}
 
-	select {
-	case <-streamCopy(p1, p2):
-	case <-streamCopy(p2, p1):
-	}
+	go streamCopy(p2, p1)
+	streamCopy(p1, p2)
 }
 
 func checkError(err error) {
@@ -163,9 +124,6 @@ func main() {
 		// add more log flags for debugging
 		log.SetFlags(log.LstdFlags | log.Lshortfile)
 	}
-	xmitBuf.New = func() interface{} {
-		return make([]byte, 32768)
-	}
 
 	myApp := cli.NewApp()
 	myApp.Name = "kcptun"

server/signal.go

@@ -8,7 +8,7 @@ import (
 	"os/signal"
 	"syscall"
 
-	kcp "github.com/xtaci/kcp-go"
+	kcp "github.com/xtaci/kcp-go/v5"
 )
 
 func init() {