+ char *topology;
+
+ if (GNUNET_OK != GNUNET_CONFIGURATION_get_value_string (cfg, "testbed", "OVERLAY_TOPOLOGY", &topology))
+ {
+ fprintf (stderr, "'OVERLAY_TOPOLOGY' not found in 'testbed' config section, "
+ "seems like you passed the wrong configuration file\n");
+ return;
+ }
+
+ if (0 == strcasecmp (topology, "NONE"))
+ {
+ fprintf (stderr, "'OVERLAY_TOPOLOGY' set to 'NONE', "
+ "seems like you passed the wrong configuration file\n");
+ return;
+ }
+
+ GNUNET_free (topology);