--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/apps/dtntunnel/IPTunnel.h	Thu Apr 21 14:57:45 2011 +0100
@@ -0,0 +1,52 @@
+/*
+ *    Copyright 2006 Intel Corporation
+ * 
+ *    Licensed under the Apache License, Version 2.0 (the "License");
+ *    you may not use this file except in compliance with the License.
+ *    You may obtain a copy of the License at
+ * 
+ *        http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ *    Unless required by applicable law or agreed to in writing, software
+ *    distributed under the License is distributed on an "AS IS" BASIS,
+ *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *    See the License for the specific language governing permissions and
+ *    limitations under the License.
+ */
+
+#ifndef _IPTUNNEL_H_
+#define _IPTUNNEL_H_
+
+#include <oasys/debug/Log.h>
+
+#include <dtn_api.h>
+#include <APIBundleQueue.h>
+
+namespace dtntunnel {
+
+/**
+ * Pure virtual base class for tunneling of IP protocols.
+ */
+class IPTunnel : public oasys::Logger {
+public:
+    /// Constructor
+    IPTunnel(const char* classname, const char* logpath)
+        : Logger(classname, "%s", logpath) {}
+    
+    /// Destructor
+    virtual ~IPTunnel() {}
+    
+    /// Add a new listener
+    virtual void add_listener(in_addr_t listen_addr,
+                              u_int16_t listen_port,
+                              in_addr_t remote_addr,
+                              u_int16_t remote_port) = 0;
+    
+    /// Handle a newly arriving bundle. The tunnel should take
+    /// ownership of the bundle structure and handle cleanup.
+    virtual void handle_bundle(dtn::APIBundle* data) = 0;
+};
+
+} // namespace dtntunnel
+
+#endif /* _IPTUNNEL_H_ */