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diff --git a/src/service/messenger/messenger_api_list_tunnels.h b/src/service/messenger/messenger_api_list_tunnels.h
new file mode 100644
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+++ b/src/service/messenger/messenger_api_list_tunnels.h
@@ -0,0 +1,157 @@
+/*
+   This file is part of GNUnet.
+   Copyright (C) 2020--2023 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/messenger_api_list_tunnels.h
+ * @brief messenger api: client and service implementation of GNUnet MESSENGER service
+ */
+
+#ifndef GNUNET_MESSENGER_API_LIST_TUNNELS_H
+#define GNUNET_MESSENGER_API_LIST_TUNNELS_H
+
+#include "platform.h"
+#include "gnunet_util_lib.h"
+
+struct GNUNET_MESSENGER_ListTunnel
+{
+  struct GNUNET_MESSENGER_ListTunnel *prev;
+  struct GNUNET_MESSENGER_ListTunnel *next;
+
+  GNUNET_PEER_Id peer;
+  struct GNUNET_HashCode *hash;
+};
+
+struct GNUNET_MESSENGER_ListTunnels
+{
+  struct GNUNET_MESSENGER_ListTunnel *head;
+  struct GNUNET_MESSENGER_ListTunnel *tail;
+};
+
+/**
+ * Initializes list of tunnels peer identities as empty list.
+ *
+ * @param[out] tunnels List of peer identities
+ */
+void
+init_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels);
+
+/**
+ * Clears the list of tunnels peer identities.
+ *
+ * @param[in,out] tunnels List of peer identities
+ */
+void
+clear_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels);
+
+/**
+ * Adds a specific <i>peer</i> from a tunnel to the end of the list.
+ *
+ * Optionally adds the <i>hash</i> of the peer message from the specific <i>peer</i>.
+ *
+ * @param[in,out] tunnels List of peer identities
+ * @param[in] peer Peer identity of tunnel
+ * @param[in] hash Hash of peer message or NULL
+ */
+void
+add_to_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                     const struct GNUNET_PeerIdentity *peer,
+                     const struct GNUNET_HashCode *hash);
+
+/**
+ * Searches linearly through the list of tunnels peer identities for matching a
+ * specific <i>peer</i> identity and returns the matching element of the list.
+ *
+ * If no matching element is found, NULL gets returned.
+ *
+ * If <i>index</i> is not NULL, <i>index</i> will be overridden with the numeric index of
+ * the found element in the list. If no matching element is found, <i>index</i> will
+ * contain the total amount of elements in the list.
+ *
+ * @param[in,out] tunnels List of peer identities
+ * @param[in] peer Peer identity of tunnel
+ * @param[out] index Index of found element (optional)
+ * @return Element in the list with matching peer identity
+ */
+struct GNUNET_MESSENGER_ListTunnel*
+find_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                   const struct GNUNET_PeerIdentity *peer,
+                   size_t *index);
+
+/**
+ * Updates a specific <i>peer</i> from a tunnel in the list.
+ *
+ * This function exists to add the <i>hash</i> of a newer peer message
+ * from the specific <i>peer</i> to the list element. It can also remove
+ * the hash when NULL is provided as new <i>hash</i> value.
+ *
+ * @param[in,out] tunnels List of peer identities
+ * @param[in] peer Peer identity of tunnel
+ * @param[in] hash Hash of peer message or NULL
+ */
+void
+update_to_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                        const struct GNUNET_PeerIdentity *peer,
+                        const struct GNUNET_HashCode *hash);
+
+/**
+ * Tests linearly if the list of tunnels peer identities contains a specific
+ * <i>peer</i> identity and returns #GNUNET_YES on success, otherwise #GNUNET_NO.
+ *
+ * @param[in,out] tunnels List of peer identities
+ * @param[in] peer Peer identity of tunnel
+ * @return #GNUNET_YES on success, otherwise #GNUNET_NO
+ */
+int
+contains_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                       const struct GNUNET_PeerIdentity *peer);
+
+/**
+ * Removes a specific <i>element</i> from the list of tunnels peer identities and returns
+ * the next element in the list.
+ *
+ * @param[in,out] tunnels List of peer identities
+ * @param[in,out] element Element of the list
+ * @return Next element in the list
+ */
+struct GNUNET_MESSENGER_ListTunnel*
+remove_from_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                          struct GNUNET_MESSENGER_ListTunnel *element);
+
+/**
+ * Loads the list of tunnels peer identities from a file under a given <i>path</i>.
+ *
+ * @param[out] tunnels List of hashes
+ * @param[in] path Path of file
+ */
+void
+load_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                   const char *path);
+
+/**
+ * Saves the list of tunnels peer identities to a file under a given <i>path</i>.
+ *
+ * @param[in] tunnels List of hashes
+ * @param[in] path Path of file
+ */
+void
+save_list_tunnels (struct GNUNET_MESSENGER_ListTunnels *tunnels,
+                   const char *path);
+
+#endif //GNUNET_MESSENGER_API_LIST_TUNNELS_H