1 files changed, 170 insertions, 371 deletions

diff --git a/src/messenger/gnunet-service-messenger_handle.c b/src/messenger/gnunet-service-messenger_handle.c
index 17692761d..ddb437b7e 100644
--- a/src/messenger/gnunet-service-messenger_handle.c
+++ b/src/messenger/gnunet-service-messenger_handle.c
@@ -1,6 +1,6 @@
 /*
    This file is part of GNUnet.
-   Copyright (C) 2020--2022 GNUnet e.V.
+   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
@@ -27,10 +27,15 @@
 #include "gnunet-service-messenger_handle.h"
 
 #include "gnunet-service-messenger.h"
-#include "gnunet-service-messenger_message_kind.h"
-
+#include "messenger_api_message_kind.h"
 #include "messenger_api_util.h"
 
+struct GNUNET_MESSENGER_NextMemberId
+{
+  struct GNUNET_ShortHashCode id;
+  enum GNUNET_GenericReturnValue reset;
+};
+
 struct GNUNET_MESSENGER_SrvHandle*
 create_srv_handle (struct GNUNET_MESSENGER_Service *service,
                    struct GNUNET_MQ_Handle *mq)
@@ -42,10 +47,10 @@ create_srv_handle (struct GNUNET_MESSENGER_Service *service,
   handle->service = service;
   handle->mq = mq;
 
-  handle->name = NULL;
-  handle->ego = NULL;
-
   handle->member_ids = GNUNET_CONTAINER_multihashmap_create (8, GNUNET_NO);
+  handle->next_ids = GNUNET_CONTAINER_multihashmap_create (4, GNUNET_NO);
+
+  handle->notify = NULL;
 
   return handle;
 }
@@ -65,22 +70,42 @@ destroy_srv_handle (struct GNUNET_MESSENGER_SrvHandle *handle)
 {
   GNUNET_assert(handle);
 
-  if (handle->service->dir)
-    save_srv_handle_configuration (handle);
+  if (handle->notify)
+    GNUNET_SCHEDULER_cancel(handle->notify);
 
-  if (handle->name)
-  {
-    struct GNUNET_MESSENGER_EgoStore *store = get_service_ego_store(handle->service);
+  GNUNET_CONTAINER_multihashmap_iterate (handle->next_ids, iterate_free_member_ids, NULL);
+  GNUNET_CONTAINER_multihashmap_iterate (handle->member_ids, iterate_free_member_ids, NULL);
+
+  GNUNET_CONTAINER_multihashmap_destroy (handle->next_ids);
+  GNUNET_CONTAINER_multihashmap_destroy (handle->member_ids);
 
-    unbind_store_ego(store, handle->name, handle);
+  GNUNET_free(handle);
+}
+
+void
+set_srv_handle_key (struct GNUNET_MESSENGER_SrvHandle *handle,
+                    const struct GNUNET_IDENTITY_PublicKey *key)
+{
+  GNUNET_assert(handle);
 
-    GNUNET_free(handle->name);
+  if ((handle->key) && (!key))
+  {
+    GNUNET_free(handle->key);
+    handle->key = NULL;
   }
+  else if (!handle->key)
+    handle->key = GNUNET_new(struct GNUNET_IDENTITY_PublicKey);
 
-  GNUNET_CONTAINER_multihashmap_iterate (handle->member_ids, iterate_free_member_ids, NULL);
-  GNUNET_CONTAINER_multihashmap_destroy (handle->member_ids);
+  if (key)
+    memcpy(handle->key, key, sizeof(struct GNUNET_IDENTITY_PublicKey));
+}
 
-  GNUNET_free(handle);
+const struct GNUNET_IDENTITY_PublicKey*
+get_srv_handle_key (const struct GNUNET_MESSENGER_SrvHandle *handle)
+{
+  GNUNET_assert(handle);
+
+  return handle->key;
 }
 
 void
@@ -156,7 +181,7 @@ change_srv_handle_member_id (struct GNUNET_MESSENGER_SrvHandle *handle,
   }
 
   if (0 == GNUNET_memcmp(unique_id, member_id))
-    goto send_message_to_client;
+    return GNUNET_OK;
 
   GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Change a member id (%s) for room (%s).\n", GNUNET_sh2s (member_id),
              GNUNET_h2s (key));
@@ -164,264 +189,70 @@ change_srv_handle_member_id (struct GNUNET_MESSENGER_SrvHandle *handle,
   GNUNET_memcpy(member_id, unique_id, sizeof(*unique_id));
 
   GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Member id changed to (%s).\n", GNUNET_sh2s (unique_id));
-
-  struct GNUNET_MESSENGER_MemberMessage *msg;
-  struct GNUNET_MQ_Envelope *env;
-
-send_message_to_client:
-
-  env = GNUNET_MQ_msg(msg, GNUNET_MESSAGE_TYPE_MESSENGER_CONNECTION_MEMBER_ID);
-
-  GNUNET_memcpy(&(msg->key), key, sizeof(*key));
-  GNUNET_memcpy(&(msg->id), member_id, sizeof(*member_id));
-
-  GNUNET_MQ_send (handle->mq, env);
   return GNUNET_OK;
 }
 
-static void
-change_handle_name (struct GNUNET_MESSENGER_SrvHandle *handle,
-                    const char *name)
-{
-  GNUNET_assert(handle);
-
-  if (handle->name)
-    GNUNET_free(handle->name);
-
-  handle->name = name ? GNUNET_strdup(name) : NULL;
-
-  const uint16_t name_len = handle->name ? strlen (handle->name) : 0;
-
-  struct GNUNET_MESSENGER_NameMessage *msg;
-  struct GNUNET_MQ_Envelope *env;
-
-  env = GNUNET_MQ_msg_extra(msg, name_len + 1, GNUNET_MESSAGE_TYPE_MESSENGER_CONNECTION_GET_NAME);
-
-  char *extra = ((char*) msg) + sizeof(*msg);
-
-  if (name_len)
-    GNUNET_memcpy(extra, handle->name, name_len);
-
-  extra[name_len] = '\0';
-
-  GNUNET_MQ_send (handle->mq, env);
-}
-
-static void
-change_handle_ego (struct GNUNET_MESSENGER_SrvHandle *handle,
-                   const struct GNUNET_MESSENGER_Ego *ego)
-{
-  GNUNET_assert(handle);
-
-  handle->ego = ego;
-
-  ego = get_srv_handle_ego (handle);
-
-  const uint16_t length = GNUNET_IDENTITY_public_key_get_length(&(ego->pub));
-
-  struct GNUNET_MESSENGER_KeyMessage *msg;
-  struct GNUNET_MQ_Envelope *env;
-
-  env = GNUNET_MQ_msg_extra(msg, length, GNUNET_MESSAGE_TYPE_MESSENGER_CONNECTION_GET_KEY);
-
-  char *extra = ((char*) msg) + sizeof(*msg);
-
-  if (GNUNET_IDENTITY_write_public_key_to_buffer(&(ego->pub), extra, length) < 0)
-    GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Could not write key to buffer.\n");
-
-  GNUNET_MQ_send (handle->mq, env);
-}
-
-struct GNUNET_MESSENGER_MessageHandle
+struct RoomInitializationClosure
 {
   struct GNUNET_MESSENGER_SrvHandle *handle;
-  struct GNUNET_MESSENGER_Message *message;
+  const struct GNUNET_HashCode *key;
+  const struct GNUNET_IDENTITY_PublicKey *pubkey;
 };
 
 static int
-iterate_send_message (void *cls,
-                      const struct GNUNET_HashCode *key,
-                      void *value)
-{
-  struct GNUNET_MESSENGER_MessageHandle *msg_handle = cls;
-
-  send_srv_handle_message (msg_handle->handle, key, msg_handle->message);
-
-  return GNUNET_YES;
-}
-
-void
-set_srv_handle_ego (struct GNUNET_MESSENGER_SrvHandle *handle,
-                    const struct GNUNET_MESSENGER_Ego *ego)
+find_member_session_in_room (void *cls,
+                             const struct GNUNET_IDENTITY_PublicKey *public_key,
+                             struct GNUNET_MESSENGER_MemberSession *session)
 {
-  GNUNET_assert((handle) && (ego));
-
-  struct GNUNET_MESSENGER_MessageHandle msg_handle;
-
-  msg_handle.handle = handle;
-  msg_handle.message = create_message_key (&(ego->priv));
-
-  GNUNET_CONTAINER_multihashmap_iterate (handle->member_ids, iterate_send_message, &msg_handle);
-
-  destroy_message (msg_handle.message);
+  struct RoomInitializationClosure *init = cls;
 
-  change_handle_ego (handle, ego);
-}
+  if (!public_key)
+    return GNUNET_YES;
 
-const struct GNUNET_MESSENGER_Ego*
-get_srv_handle_ego (const struct GNUNET_MESSENGER_SrvHandle *handle)
-{
-  GNUNET_assert(handle);
+  const struct GNUNET_IDENTITY_PublicKey *pubkey = get_srv_handle_key(init->handle);
 
-  static struct GNUNET_MESSENGER_Ego anonymous;
-  static int read_keys = 0;
+  if (0 != GNUNET_memcmp(pubkey, public_key))
+    return GNUNET_YES;
 
-  if (handle->ego)
-    return handle->ego;
+  const struct GNUNET_ShortHashCode *id = get_member_session_id(session);
 
-  if (!read_keys)
+  if (!id)
   {
-    struct GNUNET_IDENTITY_Ego *ego = GNUNET_IDENTITY_ego_get_anonymous ();
-    GNUNET_memcpy(&(anonymous.priv), GNUNET_IDENTITY_ego_get_private_key (ego), sizeof(anonymous.priv));
-    GNUNET_IDENTITY_ego_get_public_key (ego, &(anonymous.pub));
-    read_keys = 1;
+    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Initialitation: Missing member id!");
+    return GNUNET_NO;
   }
 
-  return &anonymous;
-}
+  GNUNET_log (GNUNET_ERROR_TYPE_INFO, "Initialitation: Matching member found (%s)!\n",
+              GNUNET_sh2s(id));
 
-static void
-callback_setup_handle_name (void *cls,
-                            const char *name,
-                            const struct GNUNET_MESSENGER_Ego *ego)
-{
-  struct GNUNET_MESSENGER_SrvHandle *handle = cls;
-
-  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Setting up handle...\n");
-
-  change_handle_name (handle, name);
-  change_handle_ego (handle, ego);
-
-  if (handle->service->dir)
-    load_srv_handle_configuration (handle);
-}
-
-void
-setup_srv_handle_name (struct GNUNET_MESSENGER_SrvHandle *handle,
-                       const char *name)
-{
-  GNUNET_assert(handle);
-
-  struct GNUNET_MESSENGER_EgoStore *store = get_service_ego_store(handle->service);
-
-  lookup_store_ego (store, name, callback_setup_handle_name, handle);
+  change_srv_handle_member_id(init->handle, init->key, id);
+  return GNUNET_NO;
 }
 
 static void
-callback_update_handle (void *cls,
-                        const char *name,
-                        const struct GNUNET_MESSENGER_Ego *ego)
+initialize_srv_handle_via_matching_member (struct GNUNET_MESSENGER_SrvHandle *handle,
+                                           const struct GNUNET_HashCode *key)
 {
-  struct GNUNET_MESSENGER_SrvHandle *handle = cls;
-
-  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Updating handle...\n");
-
-  struct GNUNET_MESSENGER_EgoStore *store = get_service_ego_store(handle->service);
-
-  bind_store_ego(store, handle->name, handle);
-
-  if (!ego)
-    create_store_ego (store, handle->name);
-  else
-    renew_store_ego (store, handle->name);
-}
-
-void
-update_srv_handle (struct GNUNET_MESSENGER_SrvHandle *handle)
-{
-  GNUNET_assert (handle);
-
-  if (!handle->name)
-  {
-    GNUNET_log (GNUNET_ERROR_TYPE_WARNING, "Updating handle failed: Name is required!\n");
+  struct GNUNET_MESSENGER_SrvRoom *room = get_service_room(handle->service, key);
+  if (!room)
     return;
-  }
 
-  struct GNUNET_MESSENGER_EgoStore *store = get_service_ego_store(handle->service);
-
-  lookup_store_ego (store, handle->name, callback_update_handle, handle);
-}
-
-static void
-callback_set_handle_name (void *cls,
-                          const char *name,
-                          const struct GNUNET_MESSENGER_Ego *ego)
-{
-  struct GNUNET_MESSENGER_SrvHandle *handle = cls;
-
-  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Renaming handle...\n");
-
-  if (ego)
-  {
-    GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Renaming handle failed: Name is occupied! (%s)\n", name);
+  struct GNUNET_MESSENGER_MemberStore *store = get_srv_room_member_store(room);
+  if (!store)
     return;
-  }
-
-  struct GNUNET_MESSENGER_EgoStore *store = get_service_ego_store(handle->service);
-
-  char *old_dir;
-  get_srv_handle_data_subdir (handle, handle->name, &old_dir);
-
-  char *new_dir;
-  get_srv_handle_data_subdir (handle, name, &new_dir);
-
-  if ((GNUNET_YES == GNUNET_DISK_directory_test (new_dir, GNUNET_NO)) &&
-      (GNUNET_OK != GNUNET_DISK_directory_remove(new_dir)))
-    goto free_dirs;
-
-  if (GNUNET_YES == GNUNET_DISK_directory_test (old_dir, GNUNET_YES))
-  {
-    GNUNET_DISK_directory_create_for_file (new_dir);
-
-    if (0 != rename (old_dir, new_dir))
-      goto free_dirs;
-  }
-
-  if (handle->ego)
-    rename_store_ego(store, handle->name, name);
-
-  struct GNUNET_MESSENGER_MessageHandle msg_handle;
-  msg_handle.handle = handle;
-  msg_handle.message = create_message_name (name);
-
-  GNUNET_CONTAINER_multihashmap_iterate (handle->member_ids, iterate_send_message, &msg_handle);
-  destroy_message (msg_handle.message);
-  change_handle_name (handle, name);
-
-free_dirs:
-  GNUNET_free(old_dir);
-  GNUNET_free(new_dir);
-}
-
-void
-set_srv_handle_name (struct GNUNET_MESSENGER_SrvHandle *handle,
-                     const char *name)
-{
-  GNUNET_assert(handle);
-
-  if (!name)
-  {
-    if (handle->ego)
-      GNUNET_log(GNUNET_ERROR_TYPE_ERROR, "Renaming handle failed: Name is required!\n");
-    else
-      change_handle_name (handle, name);
 
+  const struct GNUNET_IDENTITY_PublicKey *pubkey = get_srv_handle_key(handle);
+  if ((!pubkey) || (0 == GNUNET_memcmp (pubkey, get_anonymous_public_key())))
     return;
-  }
 
-  struct GNUNET_MESSENGER_EgoStore *store = get_service_ego_store(handle->service);
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Initialize member id of handle via matching member in room!\n");
+
+  struct RoomInitializationClosure init;
+  init.handle = handle;
+  init.key = key;
+  init.pubkey = pubkey;
 
-  lookup_store_ego (store, name, callback_set_handle_name, handle);
+  iterate_store_members(store, find_member_session_in_room, &init);
 }
 
 int
@@ -430,6 +261,8 @@ open_srv_handle_room (struct GNUNET_MESSENGER_SrvHandle *handle,
 {
   GNUNET_assert((handle) && (key));
 
+  initialize_srv_handle_via_matching_member (handle, key);
+
   if ((!get_srv_handle_member_id (handle, key)) && (GNUNET_YES != create_handle_member_id (handle, key)))
     return GNUNET_NO;
 
@@ -443,6 +276,8 @@ entry_srv_handle_room (struct GNUNET_MESSENGER_SrvHandle *handle,
 {
   GNUNET_assert((handle) && (door) && (key));
 
+  initialize_srv_handle_via_matching_member (handle, key);
+
   if ((!get_srv_handle_member_id (handle, key)) && (GNUNET_YES != create_handle_member_id (handle, key)))
     return GNUNET_NO;
 
@@ -455,6 +290,15 @@ close_srv_handle_room (struct GNUNET_MESSENGER_SrvHandle *handle,
 {
   GNUNET_assert((handle) && (key));
 
+  GNUNET_CONTAINER_multihashmap_get_multiple (handle->next_ids, key, iterate_free_member_ids, NULL);
+  GNUNET_CONTAINER_multihashmap_remove_all (handle->next_ids, key);
+
+  if ((handle->notify) && (0 == GNUNET_CONTAINER_multihashmap_size (handle->next_ids)))
+  {
+    GNUNET_SCHEDULER_cancel(handle->notify);
+    handle->notify = NULL;
+  }
+
   if (!get_srv_handle_member_id (handle, key))
     return GNUNET_NO;
 
@@ -476,6 +320,15 @@ send_srv_handle_message (struct GNUNET_MESSENGER_SrvHandle *handle,
     return GNUNET_NO;
   }
 
+  GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Sending message with member id: %s\n",
+              GNUNET_sh2s (id));
+
+  if (0 != GNUNET_memcmp(id, &(message->header.sender_id)))
+  {
+    GNUNET_log(GNUNET_ERROR_TYPE_WARNING, "Member id does not match with handle!\n");
+    return GNUNET_NO;
+  }
+
   struct GNUNET_MESSENGER_SrvRoom *room = get_service_room (handle->service, key);
 
   if (!room)
@@ -485,17 +338,14 @@ send_srv_handle_message (struct GNUNET_MESSENGER_SrvHandle *handle,
   }
 
   struct GNUNET_MESSENGER_Message *msg = copy_message(message);
-
-  GNUNET_memcpy(&(msg->header.sender_id), id, sizeof(*id));
-
   return send_srv_room_message (room, handle, msg);
 }
 
 static const struct GNUNET_HashCode*
-get_next_member_session_contect(const struct GNUNET_MESSENGER_MemberSession *session)
+get_next_member_session_context(const struct GNUNET_MESSENGER_MemberSession *session)
 {
   if (session->next)
-    return get_next_member_session_contect (session->next);
+    return get_next_member_session_context (session->next);
   else
     return get_member_session_context(session);
 }
@@ -510,23 +360,33 @@ get_handle_member_session (struct GNUNET_MESSENGER_SrvHandle *handle,
   const struct GNUNET_ShortHashCode *id = get_srv_handle_member_id(handle, key);
 
   if (!id)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                "Handle is missing a member id for its member session! (%s)\n",
+                GNUNET_h2s (key));
     return NULL;
+  }
 
   struct GNUNET_MESSENGER_MemberStore *store = get_srv_room_member_store(room);
   struct GNUNET_MESSENGER_Member *member = get_store_member(store, id);
 
-  const struct GNUNET_MESSENGER_Ego *ego = get_srv_handle_ego(handle);
+  const struct GNUNET_IDENTITY_PublicKey *pubkey = get_srv_handle_key(handle);
 
-  if (!ego)
+  if (!pubkey)
+  {
+    GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+                "Handle is missing a public key for its member session! (%s)\n",
+                GNUNET_h2s (key));
     return NULL;
+  }
 
-  return get_member_session(member, &(ego->pub));
+  return get_member_session(member, pubkey);
 }
 
 void
 notify_srv_handle_message (struct GNUNET_MESSENGER_SrvHandle *handle,
                            struct GNUNET_MESSENGER_SrvRoom *room,
-                           const struct GNUNET_MESSENGER_MemberSession *session,
+                           const struct GNUNET_MESSENGER_SenderSession *session,
                            const struct GNUNET_MESSENGER_Message *message,
                            const struct GNUNET_HashCode *hash)
 {
@@ -540,30 +400,26 @@ notify_srv_handle_message (struct GNUNET_MESSENGER_SrvHandle *handle,
     return;
   }
 
-  const struct GNUNET_IDENTITY_PublicKey *pubkey = get_contact_key(session->contact);
-
   struct GNUNET_HashCode sender;
-  GNUNET_CRYPTO_hash(pubkey, sizeof(*pubkey), &sender);
-
-  const struct GNUNET_HashCode *context = get_next_member_session_contect (session);
+  const struct GNUNET_HashCode *context = NULL;
 
-  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Notifying client about message: %s\n", GNUNET_h2s (hash));
-
-  struct GNUNET_MESSENGER_Message *private_message = NULL;
+  if (GNUNET_YES == is_peer_message (message))
+  {
+    const struct GNUNET_PeerIdentity *identity = session->peer;
+    GNUNET_CRYPTO_hash(identity, sizeof(*identity), &sender);
 
-  if (GNUNET_MESSENGER_KIND_PRIVATE == message->header.kind)
+    context = &sender;
+  }
+  else
   {
-    private_message = copy_message(message);
+    const struct GNUNET_IDENTITY_PublicKey *pubkey = get_contact_key(session->member->contact);
+    GNUNET_CRYPTO_hash(pubkey, sizeof(*pubkey), &sender);
 
-    if (GNUNET_YES != decrypt_message(private_message, &(get_srv_handle_ego(handle)->priv)))
-    {
-      destroy_message(private_message);
-      private_message = NULL;
-    }
-    else
-      message = private_message;
+    context = get_next_member_session_context (session->member);
   }
 
+  GNUNET_log(GNUNET_ERROR_TYPE_INFO, "Notifying client about message: %s\n", GNUNET_h2s (hash));
+
   struct GNUNET_MESSENGER_RecvMessage *msg;
   struct GNUNET_MQ_Envelope *env;
 
@@ -578,135 +434,78 @@ notify_srv_handle_message (struct GNUNET_MESSENGER_SrvHandle *handle,
 
   msg->flags = (uint32_t) GNUNET_MESSENGER_FLAG_NONE;
 
-  if (get_handle_member_session(handle, room, key) == session)
+  if (GNUNET_YES == is_peer_message (message))
+    msg->flags |= (uint32_t) GNUNET_MESSENGER_FLAG_PEER;
+  else if (get_handle_member_session(handle, room, key) == session->member)
     msg->flags |= (uint32_t) GNUNET_MESSENGER_FLAG_SENT;
 
-  if (private_message)
-    msg->flags |= (uint32_t) GNUNET_MESSENGER_FLAG_PRIVATE;
-
   char *buffer = ((char*) msg) + sizeof(*msg);
   encode_message (message, length, buffer, GNUNET_YES);
 
-  if (private_message)
-    destroy_message(private_message);
-
   GNUNET_MQ_send (handle->mq, env);
 }
 
 static int
-callback_scan_for_rooms (void *cls,
-                         const char *filename)
+iterate_next_member_ids (void *cls,
+                         const struct GNUNET_HashCode *key,
+                         void *value)
 {
   struct GNUNET_MESSENGER_SrvHandle *handle = cls;
+  struct GNUNET_MESSENGER_NextMemberId *next = value;
 
-  if ((strlen(filename) <= 4) || (0 != strcmp(filename + strlen(filename) - 4, ".cfg")))
-    return GNUNET_OK;
-
-  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Load room configuration of handle: %s\n", filename);
+  struct GNUNET_MESSENGER_MemberMessage *msg;
+  struct GNUNET_MQ_Envelope *env;
 
-  struct GNUNET_CONFIGURATION_Handle *cfg = GNUNET_CONFIGURATION_create ();
+  env = GNUNET_MQ_msg(msg, GNUNET_MESSAGE_TYPE_MESSENGER_CONNECTION_MEMBER_ID);
 
-  if ((GNUNET_YES == GNUNET_DISK_file_test (filename)) && (GNUNET_OK == GNUNET_CONFIGURATION_parse (cfg, filename)))
-  {
-    struct GNUNET_HashCode key;
-    struct GNUNET_ShortHashCode member_id;
+  GNUNET_memcpy(&(msg->key), key, sizeof(*key));
+  GNUNET_memcpy(&(msg->id), &(next->id), sizeof(next->id));
+  msg->reset = (uint32_t) next->reset;
 
-    if ((GNUNET_OK == GNUNET_CONFIGURATION_get_data (cfg, "room", "key", &key, sizeof(key))) &&
-        (GNUNET_OK == GNUNET_CONFIGURATION_get_data (cfg, "room", "member_id", &member_id, sizeof(member_id))))
-      change_srv_handle_member_id (handle, &key, &member_id);
-  }
+  GNUNET_MQ_send (handle->mq, env);
 
-  GNUNET_CONFIGURATION_destroy (cfg);
-  return GNUNET_OK;
+  GNUNET_free (next);
+  return GNUNET_YES;
 }
 
-void
-load_srv_handle_configuration (struct GNUNET_MESSENGER_SrvHandle *handle)
+static void
+task_notify_srv_handle_member_id (void *cls)
 {
-  GNUNET_assert(handle);
-
-  char *id_dir;
-  get_srv_handle_data_subdir (handle, handle->name, &id_dir);
-
-  if (GNUNET_YES == GNUNET_DISK_directory_test (id_dir, GNUNET_YES))
-  {
-    char *scan_dir;
-    GNUNET_asprintf (&scan_dir, "%s%s%c", id_dir, "rooms", DIR_SEPARATOR);
-
-    if (GNUNET_OK == GNUNET_DISK_directory_test (scan_dir, GNUNET_YES))
-      GNUNET_DISK_directory_scan (scan_dir, callback_scan_for_rooms, handle);
-
-    GNUNET_free(scan_dir);
-  }
+  struct GNUNET_MESSENGER_SrvHandle *handle = cls;
+  handle->notify = NULL;
 
-  GNUNET_free(id_dir);
+  GNUNET_CONTAINER_multihashmap_iterate (handle->next_ids, iterate_next_member_ids, handle);
+  GNUNET_CONTAINER_multihashmap_clear (handle->next_ids);
 }
 
-static int
-iterate_save_rooms (void *cls,
-                    const struct GNUNET_HashCode *key,
-                    void *value)
+void
+notify_srv_handle_member_id (struct GNUNET_MESSENGER_SrvHandle *handle,
+                             struct GNUNET_MESSENGER_SrvRoom *room,
+                             const struct GNUNET_ShortHashCode *member_id,
+                             enum GNUNET_GenericReturnValue reset)
 {
-  struct GNUNET_MESSENGER_SrvHandle *handle = cls;
-  struct GNUNET_ShortHashCode *member_id = value;
-
-  char *id_dir;
-  get_srv_handle_data_subdir (handle, handle->name, &id_dir);
-
-  char *filename;
-  GNUNET_asprintf (&filename, "%s%s%c%s.cfg", id_dir, "rooms", DIR_SEPARATOR, GNUNET_h2s (key));
-  GNUNET_free(id_dir);
-
-  GNUNET_log(GNUNET_ERROR_TYPE_DEBUG, "Save room configuration of handle: %s\n", filename);
-
-  struct GNUNET_CONFIGURATION_Handle *cfg = GNUNET_CONFIGURATION_create ();
-
-  char *key_data = GNUNET_STRINGS_data_to_string_alloc (key, sizeof(*key));
+  GNUNET_assert((handle) && (room) && (member_id));
 
-  if (key_data)
+  struct GNUNET_MESSENGER_NextMemberId *next = GNUNET_new (struct GNUNET_MESSENGER_NextMemberId);
+  if (!next)
   {
-    GNUNET_CONFIGURATION_set_value_string (cfg, "room", "key", key_data);
-
-    GNUNET_free(key_data);
-  }
-
-  char *member_id_data = GNUNET_STRINGS_data_to_string_alloc (member_id, sizeof(*member_id));
-
-  if (member_id_data)
-  {
-    GNUNET_CONFIGURATION_set_value_string (cfg, "room", "member_id", member_id_data);
-
-    GNUNET_free(member_id_data);
+    return;
   }
 
-  GNUNET_CONFIGURATION_write (cfg, filename);
-  GNUNET_CONFIGURATION_destroy (cfg);
+  GNUNET_memcpy (&(next->id), member_id, sizeof(next->id));
+  next->reset = reset;
 
-  GNUNET_free(filename);
-
-  return GNUNET_YES;
-}
-
-void
-save_srv_handle_configuration (struct GNUNET_MESSENGER_SrvHandle *handle)
-{
-  GNUNET_assert(handle);
-
-  char *id_dir;
-  get_srv_handle_data_subdir (handle, handle->name, &id_dir);
+  const struct GNUNET_HashCode *key = get_srv_room_key(room);
 
-  if ((GNUNET_YES == GNUNET_DISK_directory_test (id_dir, GNUNET_NO)) || (GNUNET_OK
-      == GNUNET_DISK_directory_create (id_dir)))
+  struct GNUNET_MESSENGER_NextMemberId *prev = GNUNET_CONTAINER_multihashmap_get(handle->next_ids, key);
+  if (GNUNET_YES != GNUNET_CONTAINER_multihashmap_put(handle->next_ids, key, next, GNUNET_CONTAINER_MULTIHASHMAPOPTION_REPLACE))
   {
-    char *save_dir;
-    GNUNET_asprintf (&save_dir, "%s%s%c", id_dir, "rooms", DIR_SEPARATOR);
-
-    if ((GNUNET_YES == GNUNET_DISK_directory_test (save_dir, GNUNET_NO)) ||
-        (GNUNET_OK == GNUNET_DISK_directory_create (save_dir)))
-      GNUNET_CONTAINER_multihashmap_iterate (handle->member_ids, iterate_save_rooms, handle);
-
-    GNUNET_free(save_dir);
+    return;
   }
 
-  GNUNET_free(id_dir);
+  if (prev)
+    GNUNET_free (prev);
+
+  if (!handle->notify)
+    handle->notify = GNUNET_SCHEDULER_add_now (task_notify_srv_handle_member_id, handle);
 }