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diff --git a/src/session_stub.hpp b/src/session_stub.hpp
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+/*
+    Copyright (c) 2007-2009 FastMQ Inc.
+
+    This file is part of 0MQ.
+
+    0MQ is free software; you can redistribute it and/or modify it under
+    the terms of the Lesser GNU General Public License as published by
+    the Free Software Foundation; either version 3 of the License, or
+    (at your option) any later version.
+
+    0MQ is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    Lesser GNU General Public License for more details.
+
+    You should have received a copy of the Lesser GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __ZS_SESSION_STUB_HPP_INCLUDED__
+#define __ZS_SESSION_STUB_HPP_INCLUDED__
+
+#include <string>
+
+#include "i_session.hpp"
+
+namespace zs
+{
+
+    //  This class is used instead of regular session till the identity of
+    //  incomming connection is established and connection is attached
+    //  to corresponding session.
+
+    class session_stub_t : public i_session
+    {
+    public:
+
+        session_stub_t (class listener_t *listener_);
+
+        //  i_session implementation.
+        void set_engine (struct i_engine *engine_);
+        void terminate ();
+        void shutdown ();
+        bool read (struct zs_msg *msg_);
+        bool write (struct zs_msg *msg_);
+        void flush ();
+
+        //  Detaches engine from the stub. Returns it to the caller.
+        struct i_engine *detach_engine ();
+
+        //  Manipulate stubs's index in listener's array of stubs.
+        void set_index (int index_);
+        int get_index ();
+
+    private:
+
+        //  Clean-up.
+        virtual ~session_stub_t ();
+
+        enum {
+            reading_identity,
+            has_identity
+        } state;
+
+        //  Reference to the associated engine.
+        i_engine *engine;
+
+        //  Reference to the listener object that owns this stub.
+        class listener_t *listener;
+
+        //  Index of the stub in listener's array of stubs.
+        int index;
+
+        //  Identity of the connection.
+        std::string identity;
+
+        session_stub_t (const session_stub_t&);
+        void operator = (const session_stub_t&);
+    };
+
+}
+
+#endif