+/**
+ * Check that message received from CADET service is well-formed.
+ *
+ * @param cls the `struct GNUNET_CADET_Handle`
+ * @param message the message we got
+ * @return #GNUNET_OK if the message is well-formed,
+ * #GNUNET_SYSERR otherwise
+ */
+static int
+check_get_tunnels (void *cls,
+ const struct GNUNET_MessageHeader *message)
+{
+ size_t esize;
+
+ esize = ntohs (message->size);
+ if (sizeof (struct GNUNET_CADET_LocalInfoTunnel) == esize)
+ return GNUNET_OK;
+ if (sizeof (struct GNUNET_MessageHeader) == esize)
+ return GNUNET_OK;
+ return GNUNET_SYSERR;
+}
+
+