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diff --git a/src/messenger/gnunet-service-messenger_basement.h b/src/messenger/gnunet-service-messenger_basement.h
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+/*
+   This file is part of GNUnet.
+   Copyright (C) 2020 GNUnet e.V.
+
+   GNUnet is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Affero General Public License as published
+   by the Free Software Foundation, either version 3 of the License,
+   or (at your option) any later version.
+
+   GNUnet is distributed in the hope that it will be useful, but
+   WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   Affero General Public License for more details.
+
+   You should have received a copy of the GNU Affero General Public License
+   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+   SPDX-License-Identifier: AGPL3.0-or-later
+ */
+/**
+ * @author Tobias Frisch
+ * @file src/messenger/gnunet-service-messenger_basement.h
+ * @brief GNUnet MESSENGER service
+ */
+
+#ifndef GNUNET_SERVICE_MESSENGER_BASEMENT_H
+#define GNUNET_SERVICE_MESSENGER_BASEMENT_H
+
+#include "messenger_api_list_tunnels.h"
+
+/**
+ * Returns the count of peers in a list (typically from the basement of a room).
+ *
+ * @param tunnels List of peer identities
+ * @return Count of the entries in the list
+ */
+size_t
+count_of_tunnels (const struct GNUNET_MESSENGER_ListTunnels *tunnels);
+
+/**
+ * Returns GNUNET_YES or GNUNET_NO to determine if the peer at index <i>src</i> should
+ * or should not connect outgoing to the peer at index <i>dst</i> to construct a complete
+ * basement with a given <i>count</i> of peers.
+ *
+ * @param count Count of peers
+ * @param src Source index
+ * @param dst Destination index
+ * @return GNUNET_YES or GNUNET_NO based on topologic requirement
+ */
+int
+should_connect_tunnel_to (size_t count, size_t src, size_t dst);
+
+/**
+ * Returns GNUNET_YES or GNUNET_NO to determine if the peers of index <i>src</i> and
+ * index <i>dst</i> should be connected in any direction to construct a complete
+ * basement with a given <i>count</i> of peers.
+ *
+ * @param count Count of peers
+ * @param src Source index
+ * @param dst Destination index
+ * @return GNUNET_YES or GNUNET_NO based on topologic requirement
+ */
+int
+required_connection_between (size_t count, size_t src, size_t dst);
+
+#endif //GNUNET_SERVICE_MESSENGER_BASEMENT_H