examples: Restoring old examples that can be restored and fixing existing ones
diff --git a/examples/ndn-custom-apps/hijacker.cpp b/examples/ndn-custom-apps/hijacker.cpp
new file mode 100644
index 0000000..2a13885
--- /dev/null
+++ b/examples/ndn-custom-apps/hijacker.cpp
@@ -0,0 +1,71 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2011-2015  Regents of the University of California.
+ *
+ * This file is part of ndnSIM. See AUTHORS for complete list of ndnSIM authors and
+ * contributors.
+ *
+ * ndnSIM is free software: you can redistribute it and/or modify it under the terms
+ * of the GNU General Public License as published by the Free Software Foundation,
+ * either version 3 of the License, or (at your option) any later version.
+ *
+ * ndnSIM 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 GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along with
+ * ndnSIM, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+ **/
+
+// hijacker.cpp
+
+#include "hijacker.hpp"
+
+#include "ns3/log.h"
+
+#include "ns3/ndnSIM/helper/ndn-fib-helper.hpp"
+
+NS_LOG_COMPONENT_DEFINE("Hijacker");
+
+namespace ns3 {
+
+// Necessary if you are planning to use ndn::AppHelper
+NS_OBJECT_ENSURE_REGISTERED(Hijacker);
+
+TypeId
+Hijacker::GetTypeId()
+{
+  static TypeId tid = TypeId("Hijacker").SetParent<ndn::App>().AddConstructor<Hijacker>();
+
+  return tid;
+}
+
+Hijacker::Hijacker()
+{
+}
+
+void
+Hijacker::OnInterest(std::shared_ptr<const ndn::Interest> interest)
+{
+  ndn::App::OnInterest(interest); // forward call to perform app-level tracing
+  // do nothing else (hijack interest)
+
+  NS_LOG_DEBUG("Do nothing for incoming interest for" << interest->getName());
+}
+
+void
+Hijacker::StartApplication()
+{
+  App::StartApplication();
+
+  // equivalent to setting interest filter for "/prefix" prefix
+  ndn::FibHelper::AddRoute(GetNode(), "/prefix/sub", m_face, 0);
+}
+
+void
+Hijacker::StopApplication()
+{
+  App::StopApplication();
+}
+
+} // namespace ns3