ipv4-end-point-demux: add method to fetch list of all endpoints

GetAllEndPoints() will be used by the network simulation cradle.
After a wakeup event, all sockets (Endpoints) have to be checked
for state changes.

src/internet-stack/ipv4-end-point-demux.cc

@@ -168,6 +168,24 @@ Ipv4EndPointDemux::DeAllocate (Ipv4EndPoint *endPoint)
     }
 }
 
+/*
+ * return list of all available Endpoints
+ */
+Ipv4EndPointDemux::EndPoints
+Ipv4EndPointDemux::GetAllEndPoints (void)
+{
+  NS_LOG_FUNCTION_NOARGS ();
+  EndPoints ret;
+
+  for (EndPointsI i = m_endPoints.begin (); i != m_endPoints.end (); i++)
+   {
+      Ipv4EndPoint* endP = *i;
+      ret.push_back(endP);
+    }
+  return ret;
+}
+
+
 /*
  * If we have an exact match, we return it.
  * Otherwise, if we find a generic match, we return it.

src/internet-stack/ipv4-end-point-demux.h

@@ -48,6 +48,7 @@ public:
   Ipv4EndPointDemux ();
   ~Ipv4EndPointDemux ();
 
+  EndPoints GetAllEndPoints (void);
   bool LookupPortLocal (uint16_t port);
   bool LookupLocal (Ipv4Address addr, uint16_t port);
   EndPoints Lookup (Ipv4Address daddr,