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diff --git a/src/messenger/gnunet-service-messenger.h b/src/messenger/gnunet-service-messenger.h
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+++ b/src/messenger/gnunet-service-messenger.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.h
+ * @brief GNUnet MESSENGER service
+ */
+
+#ifndef GNUNET_SERVICE_MESSENGER_H
+#define GNUNET_SERVICE_MESSENGER_H
+
+#include "platform.h"
+#include "gnunet_cadet_service.h"
+#include "gnunet_container_lib.h"
+#include "gnunet_crypto_lib.h"
+#include "gnunet_identity_service.h"
+#include "gnunet_mq_lib.h"
+#include "gnunet_peer_lib.h"
+#include "gnunet_protocols.h"
+#include "gnunet_util_lib.h"
+
+/**
+ * Message to create a handle for a client
+ */
+struct GNUNET_MESSENGER_CreateMessage
+{
+  struct GNUNET_MessageHeader header;
+};
+
+/**
+ * Message to update the handle (its EGO key) for a client
+ */
+struct GNUNET_MESSENGER_UpdateMessage
+{
+  struct GNUNET_MessageHeader header;
+};
+
+/**
+ * Message to destroy the handle for a client
+ */
+struct GNUNET_MESSENGER_DestroyMessage
+{
+  struct GNUNET_MessageHeader header;
+};
+
+/**
+ * Message to receive the current name of a handle
+ */
+struct GNUNET_MESSENGER_NameMessage
+{
+  struct GNUNET_MessageHeader header;
+};
+
+/**
+ * Message to receive the current public key of a handle
+ */
+struct GNUNET_MESSENGER_KeyMessage
+{
+  struct GNUNET_MessageHeader header;
+  struct GNUNET_IDENTITY_PublicKey pubkey;
+};
+
+/**
+ * General message to confirm interaction with a room
+ */
+struct GNUNET_MESSENGER_RoomMessage
+{
+  struct GNUNET_MessageHeader header;
+
+  struct GNUNET_PeerIdentity door;
+  struct GNUNET_HashCode key;
+};
+
+/**
+ * Message to receive the current member id of a handle in room
+ */
+struct GNUNET_MESSENGER_MemberMessage
+{
+  struct GNUNET_MessageHeader header;
+
+  struct GNUNET_HashCode key;
+  struct GNUNET_ShortHashCode id;
+};
+
+/**
+ * Message to send something into a room
+ */
+struct GNUNET_MESSENGER_SendMessage
+{
+  struct GNUNET_MessageHeader header;
+  struct GNUNET_HashCode key;
+};
+
+/**
+ * Message to receive something from a room
+ */
+struct GNUNET_MESSENGER_RecvMessage
+{
+  struct GNUNET_MessageHeader header;
+  struct GNUNET_HashCode key;
+  struct GNUNET_HashCode hash;
+};
+
+#endif //GNUNET_SERVICE_MESSENGER_H