Add link field to session

tunnel/session.go

@@ -83,6 +83,10 @@ func (s *session) Local() string {
 	return s.local
 }
 
+func (s *session) Link() string {
+	return s.link
+}
+
 func (s *session) Id() string {
 	return s.session
 }

tunnel/tunnel.go

@@ -62,6 +62,8 @@ type Session interface {
 	Id() string
 	// The channel name
 	Channel() string
+	// The link the session is on
+	Link() string
 	// a transport socket
 	transport.Socket
 }