+def ns3_bindings_path():
+ if "NEPI_NS3BINDINGS" in os.environ:
+ return os.environ["NEPI_NS3BINDINGS"]
+ return None
+
+def ns3_library_path():
+ if "NEPI_NS3LIBRARY" in os.environ:
+ return os.environ["NEPI_NS3LIBRARY"]
+ return None
+
+def autoconfig_ns3_backend(conf):
+ if ns3_bindings_path():
+ conf.set_attribute_value("Ns3Bindings", ns3_bindings_path())
+ if ns3_library_path():
+ conf.set_attribute_value("Ns3Library", ns3_library_path())
+
+def ns3_usable():
+ if ns3_library_path():
+ try:
+ ctypes.CDLL(ns3_library_path(), ctypes.RTLD_GLOBAL)
+ except:
+ return False
+ if ns3_bindings_path():
+ sys.path.insert(0, ns3_bindings_path())
+
+ try:
+ found = imp.find_module('ns3')
+ module = imp.load_module('ns3', *found)
+ except ImportError:
+ return False
+ finally:
+ if ns3_bindings_path():
+ del sys.path[0]
+
+ return True
+
+