remove unnecessary conn

connector/http2/connector.go

@@ -16,7 +16,6 @@ import (
 	"github.com/go-gost/gost/v3/pkg/logger"
 	md "github.com/go-gost/gost/v3/pkg/metadata"
 	"github.com/go-gost/gost/v3/pkg/registry"
-	http2_util "github.com/go-gost/x/internal/util/http2"
 )
 
 func init() {
@@ -52,9 +51,9 @@ func (c *http2Connector) Connect(ctx context.Context, conn net.Conn, network, ad
 	})
 	log.Infof("connect %s/%s", address, network)
 
-	cc, ok := conn.(*http2_util.ClientConn)
+	v, _ := conn.(md.Metadatable)
-	if !ok {
+	if v == nil {
-		err := errors.New("wrong connection type")
+		err := errors.New("http2: wrong connection type")
 		log.Error(err)
 		return nil, err
 	}
@@ -91,10 +90,11 @@ func (c *http2Connector) Connect(ctx context.Context, conn net.Conn, network, ad
 		defer conn.SetDeadline(time.Time{})
 	}
 
-	resp, err := cc.Client().Do(req.WithContext(ctx))
+	client := v.GetMetadata().Get("client").(*http.Client)
+	resp, err := client.Do(req.WithContext(ctx))
 	if err != nil {
 		log.Error(err)
-		cc.Close()
+		conn.Close()
 		return nil, err
 	}
 

dialer/http2/conn.go

@@ -0,0 +1,63 @@
+package http2
+
+import (
+	"errors"
+	"net"
+	"time"
+
+	mdata "github.com/go-gost/gost/v3/pkg/metadata"
+)
+
+// a dummy HTTP2 client conn used by HTTP2 client connector
+type conn struct {
+	localAddr  net.Addr
+	remoteAddr net.Addr
+	onClose    func()
+}
+
+func (c *conn) Close() error {
+	if c.onClose != nil {
+		c.onClose()
+	}
+	return nil
+}
+
+func (c *conn) Read(b []byte) (n int, err error) {
+	return 0, &net.OpError{Op: "read", Net: "nop", Source: nil, Addr: nil, Err: errors.New("read not supported")}
+}
+
+func (c *conn) Write(b []byte) (n int, err error) {
+	return 0, &net.OpError{Op: "write", Net: "nop", Source: nil, Addr: nil, Err: errors.New("write not supported")}
+}
+
+func (c *conn) LocalAddr() net.Addr {
+	return c.localAddr
+}
+
+func (c *conn) RemoteAddr() net.Addr {
+	return c.remoteAddr
+}
+
+func (c *conn) SetDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+func (c *conn) SetReadDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+func (c *conn) SetWriteDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+type metadataConn struct {
+	net.Conn
+	md mdata.Metadata
+}
+
+func withMetadata(md mdata.Metadata, c net.Conn) net.Conn {
+	return &metadataConn{
+		Conn: c,
+		md:   md,
+	}
+}

dialer/http2/dialer.go

@@ -12,7 +12,6 @@ import (
 	"github.com/go-gost/gost/v3/pkg/logger"
 	md "github.com/go-gost/gost/v3/pkg/metadata"
 	"github.com/go-gost/gost/v3/pkg/registry"
-	http2_util "github.com/go-gost/x/internal/util/http2"
 )
 
 func init() {
@@ -90,12 +89,19 @@ func (d *http2Dialer) Dial(ctx context.Context, address string, opts ...dialer.D
 		d.clients[address] = client
 	}
 
-	return http2_util.NewClientConn(
+	var c net.Conn
-		&net.TCPAddr{}, raddr,
+	c = &conn{
-		client,
+		localAddr:  &net.TCPAddr{},
-		func() {
+		remoteAddr: raddr,
+		onClose: func() {
 			d.clientMutex.Lock()
 			defer d.clientMutex.Unlock()
 			delete(d.clients, address)
-		}), nil
+		},
+	}
+	c = withMetadata(md.MapMetadata{
+		"client": client,
+	}, c)
+
+	return c, nil
 }

go.mod

@@ -7,7 +7,7 @@ require (
 	github.com/docker/libcontainer v2.2.1+incompatible
 	github.com/go-gost/gosocks5 v0.3.1-0.20211109033403-d894d75b7f09
 	github.com/go-gost/gost v0.0.0-20220312160816-bfc1f8472cc2
-	github.com/go-gost/gost/v3 v3.0.0-alpha.3.0.20220314141206-42f72adde0ee
+	github.com/go-gost/gost/v3 v3.0.0-alpha.3.0.20220315024338-20e7528b2588
 	github.com/go-gost/metrics v0.0.0-20220314135054-2263ae431a5f
 	github.com/go-gost/relay v0.1.1-0.20211123134818-8ef7fd81ffd7
 	github.com/go-gost/tls-dissector v0.0.2-0.20211125135007-2b5d5bd9c07e

go.sum

@@ -112,6 +112,10 @@ github.com/go-gost/gost/v3 v3.0.0-alpha.3.0.20220314122048-c282e69ffdc6 h1:epQ9S
 github.com/go-gost/gost/v3 v3.0.0-alpha.3.0.20220314122048-c282e69ffdc6/go.mod h1:Hv/IAKyc+9uEGQT5DPWsnqgAFEp4Or7uOxFawr6ghjM=
 github.com/go-gost/gost/v3 v3.0.0-alpha.3.0.20220314141206-42f72adde0ee h1:p+KM6ZUggiPnxa9l9lP+bsGjO52smX73wPeHlf5xR+E=
 github.com/go-gost/gost/v3 v3.0.0-alpha.3.0.20220314141206-42f72adde0ee/go.mod h1:hq4/YM+Vki2ODyhMCk59IwvFJks1sAYhHGnivz+6Ono=
+github.com/go-gost/gost/v3 v3.0.0-alpha.3.0.20220315022357-2e40afe53584 h1:TfVYWYW0Oyg5ojvWFVO/Vux6Ht9wt7x1HDOv09nsS1Q=
+github.com/go-gost/gost/v3 v3.0.0-alpha.3.0.20220315022357-2e40afe53584/go.mod h1:S4iyROMDN6+OvvrALvHyoV/lBswp7ExC1DS5go7woLM=
+github.com/go-gost/gost/v3 v3.0.0-alpha.3.0.20220315024338-20e7528b2588 h1:2RxUmbtz1Rz0qfzxmmfGqo61EhnY4L908LFW4nTQT1I=
+github.com/go-gost/gost/v3 v3.0.0-alpha.3.0.20220315024338-20e7528b2588/go.mod h1:S4iyROMDN6+OvvrALvHyoV/lBswp7ExC1DS5go7woLM=
 github.com/go-gost/metrics v0.0.0-20220314135054-2263ae431a5f h1:gNquUvOvPXUpq4Xk7ed7motbVN5t0HMqImf96k+pzlU=
 github.com/go-gost/metrics v0.0.0-20220314135054-2263ae431a5f/go.mod h1:Ac2Pigx5GMJEznkP9wLdBJ36+rYwWiJPqWk7lrg3FKg=
 github.com/go-gost/relay v0.1.1-0.20211123134818-8ef7fd81ffd7 h1:itaaJhQJ19kUXEB4Igb0EbY8m+1Py2AaNNSBds/9gk4=

handler/http2/handler.go

@@ -24,7 +24,6 @@ import (
 	"github.com/go-gost/gost/v3/pkg/logger"
 	md "github.com/go-gost/gost/v3/pkg/metadata"
 	"github.com/go-gost/gost/v3/pkg/registry"
-	http2_util "github.com/go-gost/x/internal/util/http2"
 )
 
 func init() {
@@ -76,13 +75,18 @@ func (h *http2Handler) Handle(ctx context.Context, conn net.Conn, opts ...handle
 		}).Infof("%s >< %s", conn.RemoteAddr(), conn.LocalAddr())
 	}()
 
-	cc, ok := conn.(*http2_util.ServerConn)
+	v, ok := conn.(md.Metadatable)
-	if !ok {
+	if !ok || v == nil {
 		err := errors.New("wrong connection type")
 		log.Error(err)
 		return err
 	}
-	return h.roundTrip(ctx, cc.Writer(), cc.Request(), log)
+	md := v.GetMetadata()
+	return h.roundTrip(ctx,
+		md.Get("w").(http.ResponseWriter),
+		md.Get("r").(*http.Request),
+		log,
+	)
 }
 
 // NOTE: there is an issue (golang/go#43989) will cause the client hangs

handler/tap/handler.go

@@ -81,8 +81,8 @@ func (h *tapHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.
 	defer conn.Close()
 
 	log := h.options.Logger
-	cc, ok := conn.(*tap_util.Conn)
+	v, _ := conn.(md.Metadatable)
-	if !ok || cc.Config() == nil {
+	if v == nil {
 		err := errors.New("tap: wrong connection type")
 		log.Error(err)
 		return err
@@ -118,7 +118,8 @@ func (h *tapHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.
 		log.Infof("%s >> %s", conn.RemoteAddr(), target.Addr)
 	}
 
-	h.handleLoop(ctx, conn, raddr, cc.Config(), log)
+	config := v.GetMetadata().Get("config").(*tap_util.Config)
+	h.handleLoop(ctx, conn, raddr, config, log)
 	return nil
 }
 

handler/tun/handler.go

@@ -84,8 +84,8 @@ func (h *tunHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.
 
 	log := h.options.Logger
 
-	cc, ok := conn.(*tun_util.Conn)
+	v, _ := conn.(md.Metadatable)
-	if !ok || cc.Config() == nil {
+	if v == nil {
 		err := errors.New("tun: wrong connection type")
 		log.Error(err)
 		return err
@@ -121,7 +121,8 @@ func (h *tunHandler) Handle(ctx context.Context, conn net.Conn, opts ...handler.
 		log.Infof("%s >> %s", conn.RemoteAddr(), target.Addr)
 	}
 
-	h.handleLoop(ctx, conn, raddr, cc.Config(), log)
+	config := v.GetMetadata().Get("config").(*tun_util.Config)
+	h.handleLoop(ctx, conn, raddr, config, log)
 	return nil
 }
 

internal/util/http2/conn.go

@@ -1,132 +0,0 @@
-package http2
-
-import (
-	"errors"
-	"net"
-	"net/http"
-	"time"
-)
-
-// a dummy HTTP2 client conn used by HTTP2 client connector
-type ClientConn struct {
-	localAddr  net.Addr
-	remoteAddr net.Addr
-	client     *http.Client
-	onClose    func()
-}
-
-func NewClientConn(localAddr, remoteAddr net.Addr, client *http.Client, onClose func()) net.Conn {
-	return &ClientConn{
-		localAddr:  localAddr,
-		remoteAddr: remoteAddr,
-		client:     client,
-		onClose:    onClose,
-	}
-}
-
-func (c *ClientConn) Client() *http.Client {
-	return c.client
-}
-
-func (c *ClientConn) Close() error {
-	if c.onClose != nil {
-		c.onClose()
-	}
-	return nil
-}
-
-func (c *ClientConn) Read(b []byte) (n int, err error) {
-	return 0, &net.OpError{Op: "read", Net: "nop", Source: nil, Addr: nil, Err: errors.New("read not supported")}
-}
-
-func (c *ClientConn) Write(b []byte) (n int, err error) {
-	return 0, &net.OpError{Op: "write", Net: "nop", Source: nil, Addr: nil, Err: errors.New("write not supported")}
-}
-
-func (c *ClientConn) LocalAddr() net.Addr {
-	return c.localAddr
-}
-
-func (c *ClientConn) RemoteAddr() net.Addr {
-	return c.remoteAddr
-}
-
-func (c *ClientConn) SetDeadline(t time.Time) error {
-	return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
-}
-
-func (c *ClientConn) SetReadDeadline(t time.Time) error {
-	return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
-}
-
-func (c *ClientConn) SetWriteDeadline(t time.Time) error {
-	return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
-}
-
-// a dummy HTTP2 server conn used by HTTP2 handler
-type ServerConn struct {
-	r          *http.Request
-	w          http.ResponseWriter
-	localAddr  net.Addr
-	remoteAddr net.Addr
-	closed     chan struct{}
-}
-
-func NewServerConn(w http.ResponseWriter, r *http.Request, localAddr, remoteAddr net.Addr) *ServerConn {
-	return &ServerConn{
-		r:          r,
-		w:          w,
-		localAddr:  localAddr,
-		remoteAddr: remoteAddr,
-		closed:     make(chan struct{}),
-	}
-}
-
-func (c *ServerConn) Done() <-chan struct{} {
-	return c.closed
-}
-
-func (c *ServerConn) Request() *http.Request {
-	return c.r
-}
-
-func (c *ServerConn) Writer() http.ResponseWriter {
-	return c.w
-}
-
-func (c *ServerConn) Read(b []byte) (n int, err error) {
-	return 0, &net.OpError{Op: "read", Net: "http2", Source: nil, Addr: nil, Err: errors.New("read not supported")}
-}
-
-func (c *ServerConn) Write(b []byte) (n int, err error) {
-	return 0, &net.OpError{Op: "write", Net: "http2", Source: nil, Addr: nil, Err: errors.New("write not supported")}
-}
-
-func (c *ServerConn) Close() error {
-	select {
-	case <-c.closed:
-	default:
-		close(c.closed)
-	}
-	return nil
-}
-
-func (c *ServerConn) LocalAddr() net.Addr {
-	return c.localAddr
-}
-
-func (c *ServerConn) RemoteAddr() net.Addr {
-	return c.remoteAddr
-}
-
-func (c *ServerConn) SetDeadline(t time.Time) error {
-	return &net.OpError{Op: "set", Net: "http2", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
-}
-
-func (c *ServerConn) SetReadDeadline(t time.Time) error {
-	return &net.OpError{Op: "set", Net: "http2", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
-}
-
-func (c *ServerConn) SetWriteDeadline(t time.Time) error {
-	return &net.OpError{Op: "set", Net: "http2", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
-}

internal/util/tap/conn.go

@@ -1,61 +0,0 @@
-package tap
-
-import (
-	"errors"
-	"net"
-	"time"
-
-	"github.com/songgao/water"
-)
-
-type Conn struct {
-	config *Config
-	ifce   *water.Interface
-	laddr  net.Addr
-	raddr  net.Addr
-}
-
-func NewConn(config *Config, ifce *water.Interface, laddr, raddr net.Addr) *Conn {
-	return &Conn{
-		config: config,
-		ifce:   ifce,
-		laddr:  laddr,
-		raddr:  raddr,
-	}
-}
-
-func (c *Conn) Config() *Config {
-	return c.config
-}
-
-func (c *Conn) Read(b []byte) (n int, err error) {
-	return c.ifce.Read(b)
-}
-
-func (c *Conn) Write(b []byte) (n int, err error) {
-	return c.ifce.Write(b)
-}
-
-func (c *Conn) Close() (err error) {
-	return c.ifce.Close()
-}
-
-func (c *Conn) LocalAddr() net.Addr {
-	return c.laddr
-}
-
-func (c *Conn) RemoteAddr() net.Addr {
-	return c.raddr
-}
-
-func (c *Conn) SetDeadline(t time.Time) error {
-	return &net.OpError{Op: "set", Net: "tuntap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
-}
-
-func (c *Conn) SetReadDeadline(t time.Time) error {
-	return &net.OpError{Op: "set", Net: "tuntap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
-}
-
-func (c *Conn) SetWriteDeadline(t time.Time) error {
-	return &net.OpError{Op: "set", Net: "tuntap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
-}

internal/util/tun/conn.go

@@ -1,61 +0,0 @@
-package tun
-
-import (
-	"errors"
-	"net"
-	"time"
-
-	"github.com/songgao/water"
-)
-
-type Conn struct {
-	config *Config
-	ifce   *water.Interface
-	laddr  net.Addr
-	raddr  net.Addr
-}
-
-func NewConn(config *Config, ifce *water.Interface, laddr, raddr net.Addr) *Conn {
-	return &Conn{
-		config: config,
-		ifce:   ifce,
-		laddr:  laddr,
-		raddr:  raddr,
-	}
-}
-
-func (c *Conn) Config() *Config {
-	return c.config
-}
-
-func (c *Conn) Read(b []byte) (n int, err error) {
-	return c.ifce.Read(b)
-}
-
-func (c *Conn) Write(b []byte) (n int, err error) {
-	return c.ifce.Write(b)
-}
-
-func (c *Conn) Close() (err error) {
-	return c.ifce.Close()
-}
-
-func (c *Conn) LocalAddr() net.Addr {
-	return c.laddr
-}
-
-func (c *Conn) RemoteAddr() net.Addr {
-	return c.raddr
-}
-
-func (c *Conn) SetDeadline(t time.Time) error {
-	return &net.OpError{Op: "set", Net: "tuntap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
-}
-
-func (c *Conn) SetReadDeadline(t time.Time) error {
-	return &net.OpError{Op: "set", Net: "tuntap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
-}
-
-func (c *Conn) SetWriteDeadline(t time.Time) error {
-	return &net.OpError{Op: "set", Net: "tuntap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
-}

listener/http2/conn.go

@@ -5,12 +5,17 @@ import (
 	"net"
 	"net/http"
 	"time"
+
+	mdata "github.com/go-gost/gost/v3/pkg/metadata"
 )
 
 // a dummy HTTP2 server conn used by HTTP2 handler
 type conn struct {
+	md     mdata.Metadata
 	r      *http.Request
 	w      http.ResponseWriter
+	laddr  net.Addr
+	raddr  net.Addr
 	closed chan struct{}
 }
 
@@ -32,13 +37,11 @@ func (c *conn) Close() error {
 }
 
 func (c *conn) LocalAddr() net.Addr {
-	addr, _ := net.ResolveTCPAddr("tcp", c.r.Host)
+	return c.raddr
-	return addr
 }
 
 func (c *conn) RemoteAddr() net.Addr {
-	addr, _ := net.ResolveTCPAddr("tcp", c.r.RemoteAddr)
+	return c.raddr
-	return addr
 }
 
 func (c *conn) SetDeadline(t time.Time) error {
@@ -52,3 +55,12 @@ func (c *conn) SetReadDeadline(t time.Time) error {
 func (c *conn) SetWriteDeadline(t time.Time) error {
 	return &net.OpError{Op: "set", Net: "http2", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
 }
+
+func (c *conn) Done() <-chan struct{} {
+	return c.closed
+}
+
+// GetMetadata implements metadata.Metadatable interface.
+func (c *conn) GetMetadata() mdata.Metadata {
+	return c.md
+}

listener/http2/listener.go

@@ -11,7 +11,6 @@ import (
 	md "github.com/go-gost/gost/v3/pkg/metadata"
 	"github.com/go-gost/gost/v3/pkg/registry"
 	metrics "github.com/go-gost/metrics/wrapper"
-	http2_util "github.com/go-gost/x/internal/util/http2"
 	"golang.org/x/net/http2"
 )
 
@@ -108,7 +107,15 @@ func (l *http2Listener) Close() (err error) {
 
 func (l *http2Listener) handleFunc(w http.ResponseWriter, r *http.Request) {
 	raddr, _ := net.ResolveTCPAddr("tcp", r.RemoteAddr)
-	conn := http2_util.NewServerConn(w, r, l.addr, raddr)
+	conn := &conn{
+		laddr:  l.addr,
+		raddr:  raddr,
+		closed: make(chan struct{}),
+		md: md.MapMetadata{
+			"r": r,
+			"w": w,
+		},
+	}
 	select {
 	case l.cqueue <- conn:
 	default:

listener/tap/conn.go

@@ -0,0 +1,60 @@
+package tap
+
+import (
+	"errors"
+	"net"
+	"time"
+
+	mdata "github.com/go-gost/gost/v3/pkg/metadata"
+	"github.com/songgao/water"
+)
+
+type conn struct {
+	ifce  *water.Interface
+	laddr net.Addr
+	raddr net.Addr
+}
+
+func (c *conn) Read(b []byte) (n int, err error) {
+	return c.ifce.Read(b)
+}
+
+func (c *conn) Write(b []byte) (n int, err error) {
+	return c.ifce.Write(b)
+}
+
+func (c *conn) LocalAddr() net.Addr {
+	return c.laddr
+}
+
+func (c *conn) RemoteAddr() net.Addr {
+	return c.raddr
+}
+
+func (c *conn) SetDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "tap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+func (c *conn) SetReadDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "tap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+func (c *conn) SetWriteDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "tap", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+func (c *conn) Close() (err error) {
+	return c.ifce.Close()
+}
+
+type metadataConn struct {
+	net.Conn
+	md mdata.Metadata
+}
+
+func withMetadata(md mdata.Metadata, c net.Conn) net.Conn {
+	return &metadataConn{
+		Conn: c,
+		md:   md,
+	}
+}

listener/tap/listener.go

@@ -5,9 +5,9 @@ import (
 
 	"github.com/go-gost/gost/v3/pkg/listener"
 	"github.com/go-gost/gost/v3/pkg/logger"
-	md "github.com/go-gost/gost/v3/pkg/metadata"
+	mdata "github.com/go-gost/gost/v3/pkg/metadata"
 	"github.com/go-gost/gost/v3/pkg/registry"
-	tap_util "github.com/go-gost/x/internal/util/tap"
+	metrics "github.com/go-gost/metrics/wrapper"
 )
 
 func init() {
@@ -15,26 +15,28 @@ func init() {
 }
 
 type tapListener struct {
-	saddr  string
+	saddr   string
-	addr   net.Addr
+	addr    net.Addr
-	cqueue chan net.Conn
+	cqueue  chan net.Conn
-	closed chan struct{}
+	closed  chan struct{}
-	logger logger.Logger
+	logger  logger.Logger
-	md     metadata
+	md      metadata
+	options listener.Options
 }
 
 func NewListener(opts ...listener.Option) listener.Listener {
-	options := &listener.Options{}
+	options := listener.Options{}
 	for _, opt := range opts {
-		opt(options)
+		opt(&options)
 	}
 	return &tapListener{
-		saddr:  options.Addr,
+		saddr:   options.Addr,
-		logger: options.Logger,
+		logger:  options.Logger,
+		options: options,
 	}
 }
 
-func (l *tapListener) Init(md md.Metadata) (err error) {
+func (l *tapListener) Init(md mdata.Metadata) (err error) {
 	if err = l.parseMetadata(md); err != nil {
 		return
 	}
@@ -64,9 +66,18 @@ func (l *tapListener) Init(md md.Metadata) (err error) {
 	l.cqueue = make(chan net.Conn, 1)
 	l.closed = make(chan struct{})
 
-	conn := tap_util.NewConn(l.md.config, ifce, l.addr, &net.IPAddr{IP: ip})
+	var c net.Conn
+	c = &conn{
+		ifce:  ifce,
+		laddr: l.addr,
+		raddr: &net.IPAddr{IP: ip},
+	}
+	c = metrics.WrapConn(l.options.Service, c)
+	c = withMetadata(mdata.MapMetadata{
+		"config": l.md.config,
+	}, c)
 
-	l.cqueue <- conn
+	l.cqueue <- c
 
 	return
 }

listener/tun/conn.go

@@ -0,0 +1,60 @@
+package tun
+
+import (
+	"errors"
+	"net"
+	"time"
+
+	mdata "github.com/go-gost/gost/v3/pkg/metadata"
+	"github.com/songgao/water"
+)
+
+type conn struct {
+	ifce  *water.Interface
+	laddr net.Addr
+	raddr net.Addr
+}
+
+func (c *conn) Read(b []byte) (n int, err error) {
+	return c.ifce.Read(b)
+}
+
+func (c *conn) Write(b []byte) (n int, err error) {
+	return c.ifce.Write(b)
+}
+
+func (c *conn) LocalAddr() net.Addr {
+	return c.laddr
+}
+
+func (c *conn) RemoteAddr() net.Addr {
+	return c.raddr
+}
+
+func (c *conn) SetDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "tun", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+func (c *conn) SetReadDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "tun", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+func (c *conn) SetWriteDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "tun", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+func (c *conn) Close() (err error) {
+	return c.ifce.Close()
+}
+
+type metadataConn struct {
+	net.Conn
+	md mdata.Metadata
+}
+
+func withMetadata(md mdata.Metadata, c net.Conn) net.Conn {
+	return &metadataConn{
+		Conn: c,
+		md:   md,
+	}
+}

listener/tun/listener.go

@@ -3,11 +3,11 @@ package tun
 import (
 	"net"
 
+	"github.com/go-gost/gost/pkg/common/metrics"
 	"github.com/go-gost/gost/v3/pkg/listener"
 	"github.com/go-gost/gost/v3/pkg/logger"
-	md "github.com/go-gost/gost/v3/pkg/metadata"
+	mdata "github.com/go-gost/gost/v3/pkg/metadata"
 	"github.com/go-gost/gost/v3/pkg/registry"
-	tun_util "github.com/go-gost/x/internal/util/tun"
 )
 
 func init() {
@@ -34,7 +34,7 @@ func NewListener(opts ...listener.Option) listener.Listener {
 	}
 }
 
-func (l *tunListener) Init(md md.Metadata) (err error) {
+func (l *tunListener) Init(md mdata.Metadata) (err error) {
 	if err = l.parseMetadata(md); err != nil {
 		return
 	}
@@ -64,9 +64,18 @@ func (l *tunListener) Init(md md.Metadata) (err error) {
 	l.cqueue = make(chan net.Conn, 1)
 	l.closed = make(chan struct{})
 
-	conn := tun_util.NewConn(l.md.config, ifce, l.addr, &net.IPAddr{IP: ip})
+	var c net.Conn
+	c = &conn{
+		ifce:  ifce,
+		laddr: l.addr,
+		raddr: &net.IPAddr{IP: ip},
+	}
+	c = metrics.WrapConn(l.options.Service, c)
+	c = withMetadata(mdata.MapMetadata{
+		"config": l.md.config,
+	}, c)
 
-	l.cqueue <- conn
+	l.cqueue <- c
 
 	return
 }