+ GNUNET_DHT_RO_FIND_PEER = 4,
+
+ /**
+ * Possible message option for query key randomization.
+ */
+ GNUNET_DHT_RO_BART = 8
+};
+
+
+/**
+ * Initialize the connection with the DHT service.
+ *
+ * @param cfg configuration to use
+ * @param ht_len size of the internal hash table to use for
+ * processing multiple GET/FIND requests in parallel
+ * @return NULL on error
+ */
+struct GNUNET_DHT_Handle *
+GNUNET_DHT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg,
+ unsigned int ht_len);
+
+
+/**
+ * Shutdown connection with the DHT service.
+ *
+ * @param handle connection to shut down
+ */
+void
+GNUNET_DHT_disconnect (struct GNUNET_DHT_Handle *handle);
+
+
+/* *************** Standard API: get and put ******************* */
+
+/**
+ * Perform a PUT operation storing data in the DHT.
+ *
+ * @param handle handle to DHT service
+ * @param key the key to store under
+ * @param desired_replication_level estimate of how many
+ * nearest peers this request should reach
+ * @param options routing options for this message
+ * @param type type of the value
+ * @param size number of bytes in data; must be less than 64k
+ * @param data the data to store
+ * @param exp desired expiration time for the value
+ * @param timeout how long to wait for transmission of this request
+ * @param cont continuation to call when done (transmitting request to service)
+ * @param cont_cls closure for cont
+ */
+void
+GNUNET_DHT_put (struct GNUNET_DHT_Handle *handle, const GNUNET_HashCode * key,
+ uint32_t desired_replication_level,
+ enum GNUNET_DHT_RouteOption options,
+ enum GNUNET_BLOCK_Type type, size_t size, const char *data,
+ struct GNUNET_TIME_Absolute exp,
+ struct GNUNET_TIME_Relative timeout, GNUNET_SCHEDULER_Task cont,
+ void *cont_cls);
+
+
+/**
+ * Iterator called on each result obtained for a DHT
+ * operation that expects a reply
+ *
+ * @param cls closure
+ * @param exp when will this value expire
+ * @param key key of the result
+ * @param get_path peers on reply path (or NULL if not recorded)
+ * @param get_path_length number of entries in get_path
+ * @param put_path peers on the PUT path (or NULL if not recorded)
+ * @param put_path_length number of entries in get_path
+ * @param type type of the result
+ * @param size number of bytes in data
+ * @param data pointer to the result data
+ */
+typedef void (*GNUNET_DHT_GetIterator) (void *cls,
+ struct GNUNET_TIME_Absolute exp,
+ const GNUNET_HashCode * key,
+ const struct GNUNET_PeerIdentity *
+ get_path, unsigned int get_path_length,
+ const struct GNUNET_PeerIdentity *
+ put_path, unsigned int put_path_length,
+ enum GNUNET_BLOCK_Type type,
+ size_t size, const void *data);
+
+
+
+/**
+ * Perform an asynchronous GET operation on the DHT identified. See
+ * also "GNUNET_BLOCK_evaluate".
+ *
+ * @param handle handle to the DHT service
+ * @param timeout how long to wait for transmission of this request to the service
+ * @param type expected type of the response object
+ * @param key the key to look up
+ * @param desired_replication_level estimate of how many
+ nearest peers this request should reach
+ * @param options routing options for this message
+ * @param xquery extended query data (can be NULL, depending on type)
+ * @param xquery_size number of bytes in xquery
+ * @param iter function to call on each result
+ * @param iter_cls closure for iter
+ *
+ * @return handle to stop the async get
+ */
+struct GNUNET_DHT_GetHandle *
+GNUNET_DHT_get_start (struct GNUNET_DHT_Handle *handle,
+ struct GNUNET_TIME_Relative timeout,
+ enum GNUNET_BLOCK_Type type, const GNUNET_HashCode * key,
+ uint32_t desired_replication_level,
+ enum GNUNET_DHT_RouteOption options, const void *xquery,
+ size_t xquery_size, GNUNET_DHT_GetIterator iter,
+ void *iter_cls);
+
+
+/**
+ * Stop async DHT-get. Frees associated resources.
+ *
+ * @param get_handle GET operation to stop.
+ *
+ * On return get_handle will no longer be valid, caller
+ * must not use again!!!
+ */
+void
+GNUNET_DHT_get_stop (struct GNUNET_DHT_GetHandle *get_handle);
+
+
+/* *************** Extended API: monitor ******************* */
+
+struct GNUNET_DHT_MonitorHandle;
+
+/**
+ * Callback called on each request going through the DHT.
+ *
+ * @param cls Closure.
+ * @param mtype Type of the DHT message monitored.
+ * @param exp When will this value expire.
+ * @param key Key of the result/request.
+ * @param get_path Peers on reply path (or NULL if not recorded).
+ * @param get_path_length number of entries in get_path.
+ * @param put_path peers on the PUT path (or NULL if not recorded).
+ * @param put_path_length number of entries in get_path.
+ * @param desired_replication_level Desired replication level.
+ * @param type Type of the result/request.
+ * @param data Pointer to the result data.
+ * @param size Number of bytes in data.
+ */
+typedef void (*GNUNET_DHT_MonitorCB) (void *cls,
+ uint16_t mtype,
+ struct GNUNET_TIME_Absolute exp,
+ const GNUNET_HashCode * key,
+ const struct GNUNET_PeerIdentity *
+ get_path, unsigned int get_path_length,
+ const struct GNUNET_PeerIdentity *
+ put_path, unsigned int put_path_length,
+ uint32_t desired_replication_level,
+ enum GNUNET_DHT_RouteOption options,
+ enum GNUNET_BLOCK_Type type,
+ const void *data,
+ size_t size);
+
+/**
+ * Start monitoring the local DHT service.
+ *
+ * @param handle Handle to the DHT service.
+ * @param type Type of blocks that are of interest.
+ * @param key Key of data of interest, NULL for all.
+ * @param cb Callback to process all monitored data.
+ * @param cb_cls Closure for cb.
+ *
+ * @return Handle to stop monitoring.
+ */
+struct GNUNET_DHT_MonitorHandle *
+GNUNET_DHT_monitor_start (struct GNUNET_DHT_Handle *handle,
+ enum GNUNET_BLOCK_Type type,
+ const GNUNET_HashCode *key,
+ GNUNET_DHT_MonitorCB cb,
+ void *cb_cls);
+
+
+/**
+ * Stop monitoring.
+ *
+ * @param handle The handle to the monitor request returned by monitor_start.
+ *
+ * On return get_handle will no longer be valid, caller must not use again!!!
+ */
+void
+GNUNET_DHT_monitor_stop (struct GNUNET_DHT_MonitorHandle *handle);