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-rw-r--r--src/messenger/gnunet-service-messenger_basement.c58
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diff --git a/src/messenger/gnunet-service-messenger_basement.c b/src/messenger/gnunet-service-messenger_basement.c
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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.c
+ * @brief GNUnet MESSENGER service
+ */
+
+#include "gnunet-service-messenger_basement.h"
+
+size_t
+count_of_tunnels (const struct GNUNET_MESSENGER_ListTunnels *tunnels)
+{
+ const struct GNUNET_MESSENGER_ListTunnel *element;
+ size_t count = 0;
+
+ for (element = tunnels->head; element; element = element->next)
+ count++;
+
+ return count;
+}
+
+int
+should_connect_tunnel_to (size_t count, size_t src, size_t dst)
+{
+ if ((src + 1) % count == dst % count)
+ return GNUNET_YES;
+
+ return GNUNET_NO;
+}
+
+int
+required_connection_between (size_t count, size_t src, size_t dst)
+{
+ if (GNUNET_YES == should_connect_tunnel_to (count, src, dst))
+ return GNUNET_YES;
+ if (GNUNET_YES == should_connect_tunnel_to (count, dst, src))
+ return GNUNET_YES;
+
+ return GNUNET_NO;
+}