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diff --git a/src/messenger/gnunet-service-messenger_list_handles.h b/src/messenger/gnunet-service-messenger_list_handles.h
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+++ b/src/messenger/gnunet-service-messenger_list_handles.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_list_handles.h
+ * @brief GNUnet MESSENGER service
+ */
+
+#ifndef GNUNET_SERVICE_MESSENGER_LIST_HANDLES_H
+#define GNUNET_SERVICE_MESSENGER_LIST_HANDLES_H
+
+#include "platform.h"
+#include "gnunet_crypto_lib.h"
+#include "gnunet_container_lib.h"
+
+struct GNUNET_MESSENGER_ListHandle
+{
+  struct GNUNET_MESSENGER_ListHandle *prev;
+  struct GNUNET_MESSENGER_ListHandle *next;
+
+  void *handle;
+};
+
+struct GNUNET_MESSENGER_ListHandles
+{
+  struct GNUNET_MESSENGER_ListHandle *head;
+  struct GNUNET_MESSENGER_ListHandle *tail;
+};
+
+/**
+ * Initializes list of handles as empty list.
+ *
+ * @param handles List of handles
+ */
+void
+init_list_handles (struct GNUNET_MESSENGER_ListHandles *handles);
+
+/**
+ * Destroys remaining handles and clears the list.
+ *
+ * @param handles List of handles
+ */
+void
+clear_list_handles (struct GNUNET_MESSENGER_ListHandles *handles);
+
+/**
+ * Adds a specific <i>handle</i> to the end of the list.
+ *
+ * @param handles List of handles
+ * @param handle Handle
+ */
+void
+add_list_handle (struct GNUNET_MESSENGER_ListHandles *handles, void *handle);
+
+/**
+ * Removes the first entry matching with a specific <i>handle</i> from the list and
+ * returns GNUNET_YES on success or GNUNET_NO on failure.
+ *
+ * @param handles List of handles
+ * @param handle Handle
+ * @return GNUNET_YES on success, otherwise GNUNET_NO
+ */
+int
+remove_list_handle (struct GNUNET_MESSENGER_ListHandles *handles, void *handle);
+
+/**
+ * Searches linearly through the list of handles for members of a specific room
+ * which is identified by a given <i>key</i>.
+ *
+ * If no handle is found which is a current member, NULL gets returned.
+ *
+ * @param handles List of handles
+ * @param key Common key of a room
+ * @return First handle which is a current member
+ */
+void*
+find_list_handle_by_member (struct GNUNET_MESSENGER_ListHandles *handles, const struct GNUNET_HashCode *key);
+
+#endif //GNUNET_SERVICE_MESSENGER_LIST_HANDLES_H