support udp

daemon.go

@@ -115,6 +115,17 @@ func install() {
 	gLog.Println(LevelINFO, "install start")
 	defer gLog.Println(LevelINFO, "install end")
 	// auto uninstall
+	err := os.MkdirAll(defaultInstallPath, 0775)
+
+	if err != nil {
+		gLog.Printf(LevelERROR, "MkdirAll %s error:%s", defaultInstallPath, err)
+		return
+	}
+	err = os.Chdir(defaultInstallPath)
+	if err != nil {
+		gLog.Println(LevelERROR, "cd error:", err)
+		return
+	}
 
 	uninstall()
 	// save config file
@@ -132,19 +143,22 @@ func install() {
 	shareBandwidth := installFlag.Int("sharebandwidth", 10, "N mbps share bandwidth limit, private network no limit")
 	logLevel := installFlag.Int("loglevel", 1, "0:debug 1:info 2:warn 3:error")
 	installFlag.Parse(os.Args[2:])
-	if *node != "" && len(*node) < 8 {
-		gLog.Println(LevelERROR, ErrNodeTooShort)
-		os.Exit(9)
-	}
-	if *node == "" { // if node name not set. use os.Hostname
-		hostname := defaultNodeName()
-		node = &hostname
-	}
+
 	gConf.load() // load old config. otherwise will clear all apps
 	gConf.LogLevel = *logLevel
 	gConf.Network.ServerHost = *serverHost
 	gConf.Network.Token = *token
-	gConf.Network.Node = *node
+	if *node != "" {
+		if len(*node) < 8 {
+			gLog.Println(LevelERROR, ErrNodeTooShort)
+			os.Exit(9)
+		}
+		gConf.Network.Node = *node
+	} else {
+		if gConf.Network.Node == "" { // if node name not set. use os.Hostname
+			gConf.Network.Node = defaultNodeName()
+		}
+	}
 	gConf.Network.ServerPort = 27183
 	gConf.Network.UDPPort1 = 27182
 	gConf.Network.UDPPort2 = 27183
@@ -159,16 +173,6 @@ func install() {
 	if config.SrcPort != 0 {
 		gConf.add(config, true)
 	}
-	err := os.MkdirAll(defaultInstallPath, 0775)
-	if err != nil {
-		gLog.Printf(LevelERROR, "MkdirAll %s error:%s", defaultInstallPath, err)
-		return
-	}
-	err = os.Chdir(defaultInstallPath)
-	if err != nil {
-		gLog.Println(LevelERROR, "cd error:", err)
-		return
-	}
 	gConf.save()
 	targetPath := filepath.Join(defaultInstallPath, defaultBinName)
 	d := daemon{}

handlepush.go

@@ -110,7 +110,6 @@ func handlePush(pn *P2PNetwork, subType uint16, msg []byte) error {
 	case MsgPushReportApps:
 		gLog.Println(LevelINFO, "MsgPushReportApps")
 		req := ReportApps{}
-		// TODO: add the retrying apps
 		gConf.mtx.Lock()
 		defer gConf.mtx.Unlock()
 		for _, config := range gConf.Apps {

log.go

@@ -110,10 +110,10 @@ func (vl *V8log) checkFile() {
 			for l, logFile := range vl.files {
 				f, e := logFile.Stat()
 				if e != nil {
-					break
+					continue
 				}
 				if f.Size() <= vl.maxLogSize {
-					break
+					continue
 				}
 				logFile.Close()
 				fname := f.Name()

openp2p.go

@@ -13,7 +13,6 @@ func main() {
 	binDir := filepath.Dir(os.Args[0])
 	os.Chdir(binDir) // for system service
 	gLog = InitLogger(binDir, "openp2p", LevelDEBUG, 1024*1024, LogFileAndConsole)
-
 	// TODO: install sub command, deamon process
 	if len(os.Args) > 1 {
 		switch os.Args[1] {

overlay.go

@@ -0,0 +1,150 @@
+package main
+
+import (
+	"bytes"
+	"encoding/binary"
+	"errors"
+	"net"
+	"time"
+)
+
+var ErrDeadlineExceeded error = &DeadlineExceededError{}
+
+// DeadlineExceededError is returned for an expired deadline.
+type DeadlineExceededError struct{}
+
+// Implement the net.Error interface.
+// The string is "i/o timeout" because that is what was returned
+// by earlier Go versions. Changing it may break programs that
+// match on error strings.
+func (e *DeadlineExceededError) Error() string   { return "i/o timeout" }
+func (e *DeadlineExceededError) Timeout() bool   { return true }
+func (e *DeadlineExceededError) Temporary() bool { return true }
+
+// implement io.Writer
+type overlayConn struct {
+	tunnel      *P2PTunnel
+	connTCP     net.Conn
+	id          uint64
+	rtid        uint64
+	running     bool
+	isClient    bool
+	appID       uint64
+	appKey      uint64
+	appKeyBytes []byte
+	// for udp
+	connUDP       *net.UDPConn
+	remoteAddr    net.Addr
+	udpRelayData  chan []byte
+	lastReadUDPTs time.Time
+}
+
+func (oConn *overlayConn) run() {
+	gLog.Printf(LevelDEBUG, "%d overlayConn run start", oConn.id)
+	defer gLog.Printf(LevelDEBUG, "%d overlayConn run end", oConn.id)
+	oConn.running = true
+	oConn.lastReadUDPTs = time.Now()
+	buffer := make([]byte, ReadBuffLen+PaddingSize)
+	readBuf := buffer[:ReadBuffLen]
+	encryptData := make([]byte, ReadBuffLen+PaddingSize) // 16 bytes for padding
+	tunnelHead := new(bytes.Buffer)
+	relayHead := new(bytes.Buffer)
+	binary.Write(relayHead, binary.LittleEndian, oConn.rtid)
+	binary.Write(tunnelHead, binary.LittleEndian, oConn.id)
+	for oConn.running && oConn.tunnel.isRuning() {
+		buff, dataLen, err := oConn.Read(readBuf)
+		if err != nil {
+			if ne, ok := err.(net.Error); ok && ne.Timeout() {
+				continue
+			}
+			// overlay tcp connection normal close, debug log
+			gLog.Printf(LevelDEBUG, "overlayConn %d read error:%s,close it", oConn.id, err)
+			break
+		}
+		payload := buff[:dataLen]
+		if oConn.appKey != 0 {
+			payload, _ = encryptBytes(oConn.appKeyBytes, encryptData, buffer[:dataLen], dataLen)
+		}
+		writeBytes := append(tunnelHead.Bytes(), payload...)
+		if oConn.rtid == 0 {
+			oConn.tunnel.conn.WriteBytes(MsgP2P, MsgOverlayData, writeBytes)
+			gLog.Printf(LevelDEBUG, "write overlay data to %d:%d bodylen=%d", oConn.rtid, oConn.id, len(writeBytes))
+		} else {
+			// write raley data
+			all := append(relayHead.Bytes(), encodeHeader(MsgP2P, MsgOverlayData, uint32(len(writeBytes)))...)
+			all = append(all, writeBytes...)
+			oConn.tunnel.conn.WriteBytes(MsgP2P, MsgRelayData, all)
+			gLog.Printf(LevelDEBUG, "write relay data to %d:%d bodylen=%d", oConn.rtid, oConn.id, len(writeBytes))
+		}
+	}
+	if oConn.connTCP != nil {
+		oConn.connTCP.Close()
+	}
+	if oConn.connUDP != nil {
+		oConn.connUDP.Close()
+	}
+	oConn.tunnel.overlayConns.Delete(oConn.id)
+	// notify peer disconnect
+	if oConn.isClient {
+		req := OverlayDisconnectReq{ID: oConn.id}
+		if oConn.rtid == 0 {
+			oConn.tunnel.conn.WriteMessage(MsgP2P, MsgOverlayDisconnectReq, &req)
+		} else {
+			// write relay data
+			msg, _ := newMessage(MsgP2P, MsgOverlayDisconnectReq, &req)
+			msgWithHead := append(relayHead.Bytes(), msg...)
+			oConn.tunnel.conn.WriteBytes(MsgP2P, MsgRelayData, msgWithHead)
+		}
+	}
+}
+
+func (oConn *overlayConn) Read(reuseBuff []byte) (buff []byte, n int, err error) {
+	if oConn.connUDP != nil {
+		if time.Now().After(oConn.lastReadUDPTs.Add(time.Minute * 5)) {
+			err = errors.New("udp close")
+			return
+		}
+		if oConn.remoteAddr != nil { // as server
+			select {
+			case buff = <-oConn.udpRelayData:
+				n = len(buff)
+				oConn.lastReadUDPTs = time.Now()
+			case <-time.After(time.Second * 10):
+				err = ErrDeadlineExceeded
+			}
+		} else { // as client
+			oConn.connUDP.SetReadDeadline(time.Now().Add(5 * time.Second))
+			n, _, err = oConn.connUDP.ReadFrom(reuseBuff)
+			if err == nil {
+				oConn.lastReadUDPTs = time.Now()
+			}
+			buff = reuseBuff
+		}
+		return
+	}
+	oConn.connTCP.SetReadDeadline(time.Now().Add(time.Second * 5))
+	n, err = oConn.connTCP.Read(reuseBuff)
+	buff = reuseBuff
+	return
+}
+
+// calling by p2pTunnel
+func (oConn *overlayConn) Write(buff []byte) (n int, err error) {
+	// add mutex when multi-thread calling
+	if oConn.connUDP != nil {
+		if oConn.remoteAddr == nil {
+			n, err = oConn.connUDP.Write(buff)
+		} else {
+			n, err = oConn.connUDP.WriteTo(buff, oConn.remoteAddr)
+		}
+		if err != nil {
+			oConn.running = false
+		}
+		return
+	}
+	n, err = oConn.connTCP.Write(buff)
+	if err != nil {
+		oConn.running = false
+	}
+	return
+}

overlaytcp.go

@@ -1,85 +0,0 @@
-package main
-
-import (
-	"bytes"
-	"encoding/binary"
-	"net"
-	"time"
-)
-
-// implement io.Writer
-type overlayTCP struct {
-	tunnel      *P2PTunnel
-	conn        net.Conn
-	id          uint64
-	rtid        uint64
-	running     bool
-	isClient    bool
-	appID       uint64
-	appKey      uint64
-	appKeyBytes []byte
-}
-
-func (otcp *overlayTCP) run() {
-	gLog.Printf(LevelDEBUG, "%d overlayTCP run start", otcp.id)
-	defer gLog.Printf(LevelDEBUG, "%d overlayTCP run end", otcp.id)
-	otcp.running = true
-	buffer := make([]byte, ReadBuffLen+PaddingSize)
-	readBuf := buffer[:ReadBuffLen]
-	encryptData := make([]byte, ReadBuffLen+PaddingSize) // 16 bytes for padding
-	tunnelHead := new(bytes.Buffer)
-	relayHead := new(bytes.Buffer)
-	binary.Write(relayHead, binary.LittleEndian, otcp.rtid)
-	binary.Write(tunnelHead, binary.LittleEndian, otcp.id)
-	for otcp.running && otcp.tunnel.isRuning() {
-		otcp.conn.SetReadDeadline(time.Now().Add(time.Second * 5))
-		dataLen, err := otcp.conn.Read(readBuf)
-		if err != nil {
-			if ne, ok := err.(net.Error); ok && ne.Timeout() {
-				continue
-			}
-			// overlay tcp connection normal close, debug log
-			gLog.Printf(LevelDEBUG, "overlayTCP %d read error:%s,close it", otcp.id, err)
-			break
-		} else {
-			payload := readBuf[:dataLen]
-			if otcp.appKey != 0 {
-				payload, _ = encryptBytes(otcp.appKeyBytes, encryptData, buffer[:dataLen], dataLen)
-			}
-			writeBytes := append(tunnelHead.Bytes(), payload...)
-			if otcp.rtid == 0 {
-				otcp.tunnel.conn.WriteBytes(MsgP2P, MsgOverlayData, writeBytes)
-			} else {
-				// write raley data
-				all := append(relayHead.Bytes(), encodeHeader(MsgP2P, MsgOverlayData, uint32(len(writeBytes)))...)
-				all = append(all, writeBytes...)
-				otcp.tunnel.conn.WriteBytes(MsgP2P, MsgRelayData, all)
-				gLog.Printf(LevelDEBUG, "write relay data to %d:%d bodylen=%d", otcp.rtid, otcp.id, len(writeBytes))
-			}
-		}
-	}
-	otcp.conn.Close()
-	otcp.tunnel.overlayConns.Delete(otcp.id)
-	// notify peer disconnect
-	if otcp.isClient {
-		req := OverlayDisconnectReq{ID: otcp.id}
-		if otcp.rtid == 0 {
-			otcp.tunnel.conn.WriteMessage(MsgP2P, MsgOverlayDisconnectReq, &req)
-		} else {
-			// write relay data
-			msg, _ := newMessage(MsgP2P, MsgOverlayDisconnectReq, &req)
-			msgWithHead := append(relayHead.Bytes(), msg...)
-			otcp.tunnel.conn.WriteBytes(MsgP2P, MsgRelayData, msgWithHead)
-		}
-	}
-}
-
-// calling by p2pTunnel
-func (otcp *overlayTCP) Write(buff []byte) (n int, err error) {
-	// add mutex when multi-thread calling
-	n, err = otcp.conn.Write(buff)
-	if err != nil {
-		otcp.tunnel.overlayConns.Delete(otcp.id)
-	}
-	return
-}

p2papp.go

@@ -6,23 +6,26 @@ import (
 	"fmt"
 	"math/rand"
 	"net"
+	"strconv"
+	"strings"
 	"sync"
 	"time"
 )
 
 type p2pApp struct {
-	config    AppConfig
-	listener  net.Listener
-	tunnel    *P2PTunnel
-	rtid      uint64
-	relayNode string
-	relayMode string
-	hbTime    time.Time
-	hbMtx     sync.Mutex
-	running   bool
-	id        uint64
-	key       uint64
-	wg        sync.WaitGroup
+	config      AppConfig
+	listener    net.Listener
+	listenerUDP *net.UDPConn
+	tunnel      *P2PTunnel
+	rtid        uint64
+	relayNode   string
+	relayMode   string
+	hbTime      time.Time
+	hbMtx       sync.Mutex
+	running     bool
+	id          uint64
+	key         uint64
+	wg          sync.WaitGroup
 }
 
 func (app *p2pApp) isActive() bool {
@@ -45,43 +48,42 @@ func (app *p2pApp) updateHeartbeat() {
 }
 
 func (app *p2pApp) listenTCP() error {
+	gLog.Printf(LevelDEBUG, "tcp accept on port %d start", app.config.SrcPort)
+	defer gLog.Printf(LevelDEBUG, "tcp accept on port %d end", app.config.SrcPort)
 	var err error
-	if app.config.Protocol == "udp" {
-		app.listener, err = net.Listen("udp4", fmt.Sprintf("0.0.0.0:%d", app.config.SrcPort))
-	} else {
-		app.listener, err = net.Listen("tcp4", fmt.Sprintf("0.0.0.0:%d", app.config.SrcPort))
-	}
-
+	app.listener, err = net.Listen("tcp4", fmt.Sprintf("0.0.0.0:%d", app.config.SrcPort))
 	if err != nil {
 		gLog.Printf(LevelERROR, "listen error:%s", err)
 		return err
 	}
-	for {
+	for app.running {
 		conn, err := app.listener.Accept()
 		if err != nil {
-			gLog.Printf(LevelERROR, "%d accept error:%s", app.tunnel.id, err)
+			if app.running {
+				gLog.Printf(LevelERROR, "%d accept error:%s", app.tunnel.id, err)
+			}
 			break
 		}
-		otcp := overlayTCP{
+		oConn := overlayConn{
 			tunnel:   app.tunnel,
-			conn:     conn,
+			connTCP:  conn,
 			id:       rand.Uint64(),
 			isClient: true,
 			rtid:     app.rtid,
 			appID:    app.id,
 			appKey:   app.key,
 		}
-		// calc key bytes for encrypt
-		if otcp.appKey != 0 {
+		// pre-calc key bytes for encrypt
+		if oConn.appKey != 0 {
 			encryptKey := make([]byte, AESKeySize)
-			binary.LittleEndian.PutUint64(encryptKey, otcp.appKey)
-			binary.LittleEndian.PutUint64(encryptKey[8:], otcp.appKey)
-			otcp.appKeyBytes = encryptKey
+			binary.LittleEndian.PutUint64(encryptKey, oConn.appKey)
+			binary.LittleEndian.PutUint64(encryptKey[8:], oConn.appKey)
+			oConn.appKeyBytes = encryptKey
 		}
-		app.tunnel.overlayConns.Store(otcp.id, &otcp)
-		gLog.Printf(LevelDEBUG, "Accept overlayID:%d", otcp.id)
+		app.tunnel.overlayConns.Store(oConn.id, &oConn)
+		gLog.Printf(LevelDEBUG, "Accept TCP overlayID:%d", oConn.id)
 		// tell peer connect
-		req := OverlayConnectReq{ID: otcp.id,
+		req := OverlayConnectReq{ID: oConn.id,
 			Token:    app.tunnel.pn.config.Token,
 			DstIP:    app.config.DstHost,
 			DstPort:  app.config.DstPort,
@@ -98,26 +100,117 @@ func (app *p2pApp) listenTCP() error {
 			msgWithHead := append(relayHead.Bytes(), msg...)
 			app.tunnel.conn.WriteBytes(MsgP2P, MsgRelayData, msgWithHead)
 		}
+		go oConn.run()
+	}
+	return nil
+}
 
-		go otcp.run()
+func (app *p2pApp) listenUDP() error {
+	gLog.Printf(LevelDEBUG, "udp accept on port %d start", app.config.SrcPort)
+	defer gLog.Printf(LevelDEBUG, "udp accept on port %d end", app.config.SrcPort)
+	var err error
+	app.listenerUDP, err = net.ListenUDP("udp", &net.UDPAddr{IP: net.IPv4zero, Port: app.config.SrcPort})
+	if err != nil {
+		gLog.Printf(LevelERROR, "listen error:%s", err)
+		return err
+	}
+	buffer := make([]byte, 64*1024)
+	udpID := make([]byte, 8)
+	for {
+		app.listenerUDP.SetReadDeadline(time.Now().Add(time.Second * 10))
+		len, remoteAddr, err := app.listenerUDP.ReadFrom(buffer)
+		if err != nil {
+			if ne, ok := err.(net.Error); ok && ne.Timeout() {
+				continue
+			} else {
+				gLog.Printf(LevelERROR, "udp read failed:%s", err)
+				break
+			}
+		} else {
+			b := bytes.Buffer{}
+			b.Write(buffer[:len])
+			// load from app.tunnel.overlayConns by remoteAddr error, new udp connection
+			remoteIP := strings.Split(remoteAddr.String(), ":")[0]
+			port, _ := strconv.Atoi(strings.Split(remoteAddr.String(), ":")[1])
+			a := net.ParseIP(remoteIP)
+			udpID[0] = a[0]
+			udpID[1] = a[1]
+			udpID[2] = a[2]
+			udpID[3] = a[3]
+			udpID[4] = byte(port)
+			udpID[5] = byte(port >> 8)
+			id := binary.LittleEndian.Uint64(udpID)
+			s, ok := app.tunnel.overlayConns.Load(id)
+			if !ok {
+				oConn := overlayConn{
+					tunnel:       app.tunnel,
+					connUDP:      app.listenerUDP,
+					remoteAddr:   remoteAddr,
+					udpRelayData: make(chan []byte, 1000),
+					id:           id,
+					isClient:     true,
+					rtid:         app.rtid,
+					appID:        app.id,
+					appKey:       app.key,
+				}
+				// calc key bytes for encrypt
+				if oConn.appKey != 0 {
+					encryptKey := make([]byte, AESKeySize)
+					binary.LittleEndian.PutUint64(encryptKey, oConn.appKey)
+					binary.LittleEndian.PutUint64(encryptKey[8:], oConn.appKey)
+					oConn.appKeyBytes = encryptKey
+				}
+				app.tunnel.overlayConns.Store(oConn.id, &oConn)
+				gLog.Printf(LevelDEBUG, "Accept UDP overlayID:%d", oConn.id)
+				// tell peer connect
+				req := OverlayConnectReq{ID: oConn.id,
+					Token:    app.tunnel.pn.config.Token,
+					DstIP:    app.config.DstHost,
+					DstPort:  app.config.DstPort,
+					Protocol: app.config.Protocol,
+					AppID:    app.id,
+				}
+				if app.rtid == 0 {
+					app.tunnel.conn.WriteMessage(MsgP2P, MsgOverlayConnectReq, &req)
+				} else {
+					req.RelayTunnelID = app.tunnel.id
+					relayHead := new(bytes.Buffer)
+					binary.Write(relayHead, binary.LittleEndian, app.rtid)
+					msg, _ := newMessage(MsgP2P, MsgOverlayConnectReq, &req)
+					msgWithHead := append(relayHead.Bytes(), msg...)
+					app.tunnel.conn.WriteBytes(MsgP2P, MsgRelayData, msgWithHead)
+				}
+				go oConn.run()
+				oConn.udpRelayData <- b.Bytes()
+			}
+
+			// load from app.tunnel.overlayConns by remoteAddr ok, write relay data
+			overlayConn, ok := s.(*overlayConn)
+			if !ok {
+				continue
+			}
+			overlayConn.udpRelayData <- b.Bytes()
+		}
 	}
 	return nil
 }
 
 func (app *p2pApp) listen() error {
-	gLog.Printf(LevelINFO, "LISTEN ON PORT %d START", app.config.SrcPort)
-	defer gLog.Printf(LevelINFO, "LISTEN ON PORT %d START", app.config.SrcPort)
+	gLog.Printf(LevelINFO, "LISTEN ON PORT %s:%d START", app.config.Protocol, app.config.SrcPort)
+	defer gLog.Printf(LevelINFO, "LISTEN ON PORT %s:%d END", app.config.Protocol, app.config.SrcPort)
 	app.wg.Add(1)
 	defer app.wg.Done()
 	app.running = true
 	if app.rtid != 0 {
 		go app.relayHeartbeatLoop()
 	}
-	for app.running {
-
-		app.listenTCP()
-
-		time.Sleep(time.Second * 5)
+	for app.tunnel.isRuning() && app.running {
+		if app.config.Protocol == "udp" {
+			app.listenUDP()
+		} else {
+			app.listenTCP()
+		}
+		time.Sleep(time.Second * 10)
 	}
 	return nil
 }
@@ -127,6 +220,9 @@ func (app *p2pApp) close() {
 	if app.listener != nil {
 		app.listener.Close()
 	}
+	if app.listenerUDP != nil {
+		app.listenerUDP.Close()
+	}
 	if app.tunnel != nil {
 		app.tunnel.closeOverlayConns(app.id)
 	}

p2pnetwork.go

@@ -107,23 +107,21 @@ func (pn *P2PNetwork) runAll() {
 			config.AppName = fmt.Sprintf("%s%d", config.Protocol, config.SrcPort)
 		}
 		appExist := false
-		appActive := false
+		var appID uint64
 		i, ok := pn.apps.Load(fmt.Sprintf("%s%d", config.Protocol, config.SrcPort))
 		if ok {
 			app := i.(*p2pApp)
 			appExist = true
+			appID = app.id
 			if app.isActive() {
-				appActive = true
+				continue
 			}
 		}
-		if appExist && appActive {
-			continue
-		}
-		if appExist && !appActive {
+		if appExist {
 			pn.DeleteApp(*config)
 		}
 		if config.retryNum > 0 {
-			gLog.Printf(LevelINFO, "detect app %s disconnect, reconnecting the %d times...", config.AppName, config.retryNum)
+			gLog.Printf(LevelINFO, "detect app %s(%d) disconnect, reconnecting the %d times...", config.AppName, appID, config.retryNum)
 			if time.Now().Add(-time.Minute * 15).After(config.retryTime) { // normal lasts 15min
 				config.retryNum = 0
 			}
@@ -135,12 +133,11 @@ func (pn *P2PNetwork) runAll() {
 			increase = 900
 		}
 		config.nextRetryTime = time.Now().Add(time.Second * time.Duration(increase)) // exponential increase retry time. 1.3^x
-		go pn.AddApp(*config)
+		pn.AddApp(*config)
 	}
 }
 func (pn *P2PNetwork) autorunApp() {
 	gLog.Println(LevelINFO, "autorunApp start")
-	// TODO: use gConf to check reconnect
 	for pn.running {
 		time.Sleep(time.Second)
 		if !pn.online {

p2ptunnel.go

@@ -276,7 +276,7 @@ func (t *P2PTunnel) readLoop() {
 				gLog.Printf(LevelDEBUG, "%d tunnel not found overlay connection %d", t.id, overlayID)
 				continue
 			}
-			overlayConn, ok := s.(*overlayTCP)
+			overlayConn, ok := s.(*overlayConn)
 			if !ok {
 				continue
 			}
@@ -333,35 +333,34 @@ func (t *P2PTunnel) readLoop() {
 
 			overlayID := req.ID
 			gLog.Printf(LevelDEBUG, "App:%d overlayID:%d connect %+v", req.AppID, overlayID, req)
-			var conn net.Conn
-			if req.Protocol == "udp" {
-				conn, err = net.DialTimeout("udp", fmt.Sprintf("%s:%d", req.DstIP, req.DstPort), time.Second*5)
-			} else {
-				conn, err = net.DialTimeout("tcp", fmt.Sprintf("%s:%d", req.DstIP, req.DstPort), time.Second*5)
-			}
-			if err != nil {
-				gLog.Println(LevelERROR, err)
-				continue
-			}
-			otcp := overlayTCP{
+			oConn := overlayConn{
 				tunnel:   t,
-				conn:     conn,
 				id:       overlayID,
 				isClient: false,
 				rtid:     req.RelayTunnelID,
 				appID:    req.AppID,
 				appKey:   GetKey(req.AppID),
 			}
-			// calc key bytes for encrypt
-			if otcp.appKey != 0 {
-				encryptKey := make([]byte, 16)
-				binary.LittleEndian.PutUint64(encryptKey, otcp.appKey)
-				binary.LittleEndian.PutUint64(encryptKey[8:], otcp.appKey)
-				otcp.appKeyBytes = encryptKey
+			if req.Protocol == "udp" {
+				oConn.connUDP, err = net.DialUDP("udp", nil, &net.UDPAddr{IP: net.ParseIP(req.DstIP), Port: req.DstPort})
+			} else {
+				oConn.connTCP, err = net.DialTimeout("tcp", fmt.Sprintf("%s:%d", req.DstIP, req.DstPort), time.Second*5)
+			}
+			if err != nil {
+				gLog.Println(LevelERROR, err)
+				continue
 			}
 
-			t.overlayConns.Store(otcp.id, &otcp)
-			go otcp.run()
+			// calc key bytes for encrypt
+			if oConn.appKey != 0 {
+				encryptKey := make([]byte, 16)
+				binary.LittleEndian.PutUint64(encryptKey, oConn.appKey)
+				binary.LittleEndian.PutUint64(encryptKey[8:], oConn.appKey)
+				oConn.appKeyBytes = encryptKey
+			}
+
+			t.overlayConns.Store(oConn.id, &oConn)
+			go oConn.run()
 		case MsgOverlayDisconnectReq:
 			req := OverlayDisconnectReq{}
 			err := json.Unmarshal(body, &req)
@@ -373,8 +372,8 @@ func (t *P2PTunnel) readLoop() {
 			gLog.Printf(LevelDEBUG, "%d disconnect overlay connection %d", t.id, overlayID)
 			i, ok := t.overlayConns.Load(overlayID)
 			if ok {
-				otcp := i.(*overlayTCP)
-				otcp.running = false
+				oConn := i.(*overlayConn)
+				oConn.running = false
 			}
 		default:
 		}
@@ -411,9 +410,16 @@ func (t *P2PTunnel) listen() error {
 
 func (t *P2PTunnel) closeOverlayConns(appID uint64) {
 	t.overlayConns.Range(func(_, i interface{}) bool {
-		otcp := i.(*overlayTCP)
-		if otcp.appID == appID {
-			otcp.conn.Close()
+		oConn := i.(*overlayConn)
+		if oConn.appID == appID {
+			if oConn.connTCP != nil {
+				oConn.connTCP.Close()
+				oConn.connTCP = nil
+			}
+			if oConn.connUDP != nil {
+				oConn.connUDP.Close()
+				oConn.connUDP = nil
+			}
 		}
 		return true
 	})

protocol.go

@@ -10,7 +10,7 @@ import (
 	"time"
 )
 
-const OpenP2PVersion = "1.2.0"
+const OpenP2PVersion = "1.3.0"
 const ProducnName string = "openp2p"
 
 type openP2PHeader struct {
@@ -117,7 +117,7 @@ const (
 )
 
 const (
-	ReadBuffLen           = 1024
+	ReadBuffLen           = 4096             // for UDP maybe not enough
 	NetworkHeartbeatTime  = time.Second * 30 // TODO: server no response hb, save flow
 	TunnelHeartbeatTime   = time.Second * 15
 	TunnelIdleTimeout     = time.Minute