fix memory leaks for simple sample code

src/node/arp.cc

@@ -35,6 +35,14 @@ Arp::Arp (Node *node)
   : m_node (node)
 {}
 
+Arp::~Arp ()
+{
+  for (CacheList::const_iterator i = m_cacheList.begin (); i != m_cacheList.end (); i++)
+    {
+      delete *i;
+    }
+}
+
 Arp *
 Arp::Copy (Node *node)
 {

src/node/internet-node.cc

@@ -61,6 +61,16 @@ InternetNode::InternetNode (InternetNode const &o)
   SetupLoopback ();
 }
 
+InternetNode::~InternetNode ()
+{
+  delete m_netDevices;
+  delete m_l3Demux;
+  delete m_ipv4L4Demux;
+  delete m_udp;
+  delete m_ipv4;
+  delete m_arp;
+}
+
 void
 InternetNode::SetupLoopback (void)
 {

src/node/internet-node.h

@@ -35,8 +35,9 @@ class InternetNode : public Node
 {
 public:
   InternetNode();
-  InternetNode(const InternetNode&); // Copy constructor 
-  virtual InternetNode* Copy() const;// Make a copy of this node
+  InternetNode(const InternetNode&);
+  virtual ~InternetNode ();
+  virtual InternetNode* Copy() const;
   // Capability access
   virtual NetDeviceList*   GetNetDevices() const;
   virtual L3Demux*         GetL3Demux() const;

src/node/ipv4-l4-demux.cc

@@ -32,7 +32,12 @@ Ipv4L4Demux::Ipv4L4Demux (Node *node)
 {}
 
 Ipv4L4Demux::~Ipv4L4Demux()
-{}
+{
+  for (L4List_t::const_iterator i = m_protocols.begin(); i != m_protocols.end(); ++i)
+    {
+      delete *i;
+    }
+}
 Ipv4L4Demux* 
 Ipv4L4Demux::Copy(Node *node) const
 {