diff --git a/proxy/base.go b/proxy/base.go
index 90a9396..aa70663 100755
--- a/proxy/base.go
+++ b/proxy/base.go
@@ -8,6 +8,8 @@ import (
 	"github.com/xjasonlyu/tun2socks/common/adapter"
 )
 
+var _ Proxy = (*Base)(nil)
+
 type Base struct {
 	addr string
 }
@@ -20,6 +22,10 @@ func (b *Base) Addr() string {
 	return b.addr
 }
 
+func (b *Base) Type() string {
+	return "base"
+}
+
 func (b *Base) DialContext(context.Context, *adapter.Metadata) (net.Conn, error) {
 	return nil, errors.New("not supported")
 }
diff --git a/proxy/direct.go b/proxy/direct.go
index 6960c24..219ae93 100755
--- a/proxy/direct.go
+++ b/proxy/direct.go
@@ -8,6 +8,8 @@ import (
 	"github.com/xjasonlyu/tun2socks/component/dialer"
 )
 
+var _ Proxy = (*Direct)(nil)
+
 type Direct struct {
 	*Base
 }
@@ -16,6 +18,10 @@ func NewDirect() *Direct {
 	return &Direct{}
 }
 
+func (d *Direct) Type() string {
+	return "direct"
+}
+
 func (d *Direct) DialContext(ctx context.Context, metadata *adapter.Metadata) (net.Conn, error) {
 	c, err := dialer.DialContext(ctx, "tcp", metadata.DestinationAddress())
 	if err != nil {
diff --git a/proxy/proxy.go b/proxy/proxy.go
index d9fb465..06617c4 100755
--- a/proxy/proxy.go
+++ b/proxy/proxy.go
@@ -22,6 +22,12 @@ type Dialer interface {
 	DialUDP(*adapter.Metadata) (net.PacketConn, error)
 }
 
+type Proxy interface {
+	Dialer
+	Addr() string
+	Type() string
+}
+
 // SetDialer sets default Dialer.
 func SetDialer(d Dialer) {
 	_defaultDialer = d
diff --git a/proxy/shadowsocks.go b/proxy/shadowsocks.go
index fb424a9..9622e23 100755
--- a/proxy/shadowsocks.go
+++ b/proxy/shadowsocks.go
@@ -14,6 +14,8 @@ import (
 	"github.com/Dreamacro/go-shadowsocks2/core"
 )
 
+var _ Proxy = (*ShadowSocks)(nil)
+
 type ShadowSocks struct {
 	*Base
 
@@ -37,6 +39,10 @@ func NewShadowSocks(addr, method, password, obfsMode, obfsHost string) (*ShadowS
 	}, nil
 }
 
+func (ss *ShadowSocks) Type() string {
+	return "ss"
+}
+
 func (ss *ShadowSocks) DialContext(ctx context.Context, metadata *adapter.Metadata) (c net.Conn, err error) {
 	c, err = dialer.DialContext(ctx, "tcp", ss.Addr())
 	if err != nil {
diff --git a/proxy/socks5.go b/proxy/socks5.go
index 8afa900..0c1a353 100755
--- a/proxy/socks5.go
+++ b/proxy/socks5.go
@@ -12,6 +12,8 @@ import (
 	"github.com/xjasonlyu/tun2socks/component/socks5"
 )
 
+var _ Proxy = (*Socks5)(nil)
+
 type Socks5 struct {
 	*Base
 
@@ -27,6 +29,10 @@ func NewSocks5(addr, user, pass string) (*Socks5, error) {
 	}, nil
 }
 
+func (ss *Socks5) Type() string {
+	return "socks5"
+}
+
 func (ss *Socks5) DialContext(ctx context.Context, metadata *adapter.Metadata) (c net.Conn, err error) {
 	c, err = dialer.DialContext(ctx, "tcp", ss.Addr())
 	if err != nil {