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- /*
- This file is part of GNUnet.
- (C) 2009, 2010, 2011 Christian Grothoff (and other contributing authors)
- GNUnet is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published
- by the Free Software Foundation; either version 3, 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
- General Public License for more details.
- You should have received a copy of the GNU General Public License
- along with GNUnet; see the file COPYING. If not, write to the
- Free Software Foundation, Inc., 59 Temple Place - Suite 330,
- Boston, MA 02111-1307, USA.
- */
- /**
- * @file dht/gnunet-service-dht_clients.c
- * @brief GNUnet DHT service's client management code
- * @author Christian Grothoff
- * @author Nathan Evans
- */
- #include "platform.h"
- #include "gnunet_constants.h"
- #include "gnunet_protocols.h"
- #include "gnunet_statistics_service.h"
- #include "gnunet-service-dht.h"
- #include "gnunet-service-dht_clients.h"
- #include "gnunet-service-dht_datacache.h"
- #include "gnunet-service-dht_neighbours.h"
- #include "dht.h"
- /**
- * Should routing details be logged to stderr (for debugging)?
- */
- #define LOG_TRAFFIC(kind,...) GNUNET_log_from (kind, "dht-traffic",__VA_ARGS__)
- #define LOG(kind,...) GNUNET_log_from (kind, "dht-clients",__VA_ARGS__)
- /**
- * Linked list of messages to send to clients.
- */
- struct PendingMessage
- {
- /**
- * Pointer to next item in the list
- */
- struct PendingMessage *next;
- /**
- * Pointer to previous item in the list
- */
- struct PendingMessage *prev;
- /**
- * Actual message to be sent, allocated at the end of the struct:
- * // msg = (cast) &pm[1];
- * // memcpy (&pm[1], data, len);
- */
- const struct GNUNET_MessageHeader *msg;
- };
- /**
- * Struct containing information about a client,
- * handle to connect to it, and any pending messages
- * that need to be sent to it.
- */
- struct ClientList
- {
- /**
- * Linked list of active clients
- */
- struct ClientList *next;
- /**
- * Linked list of active clients
- */
- struct ClientList *prev;
- /**
- * The handle to this client
- */
- struct GNUNET_SERVER_Client *client_handle;
- /**
- * Handle to the current transmission request, NULL
- * if none pending.
- */
- struct GNUNET_SERVER_TransmitHandle *transmit_handle;
- /**
- * Linked list of pending messages for this client
- */
- struct PendingMessage *pending_head;
- /**
- * Tail of linked list of pending messages for this client
- */
- struct PendingMessage *pending_tail;
- };
- /**
- * Entry in the local forwarding map for a client's GET request.
- */
- struct ClientQueryRecord
- {
- /**
- * The key this request was about
- */
- struct GNUNET_HashCode key;
- /**
- * Client responsible for the request.
- */
- struct ClientList *client;
- /**
- * Extended query (see gnunet_block_lib.h), allocated at the end of this struct.
- */
- const void *xquery;
- /**
- * Replies we have already seen for this request.
- */
- struct GNUNET_HashCode *seen_replies;
- /**
- * Pointer to this nodes heap location in the retry-heap (for fast removal)
- */
- struct GNUNET_CONTAINER_HeapNode *hnode;
- /**
- * What's the delay between re-try operations that we currently use for this
- * request?
- */
- struct GNUNET_TIME_Relative retry_frequency;
- /**
- * What's the next time we should re-try this request?
- */
- struct GNUNET_TIME_Absolute retry_time;
- /**
- * The unique identifier of this request
- */
- uint64_t unique_id;
- /**
- * Number of bytes in xquery.
- */
- size_t xquery_size;
- /**
- * Number of entries in 'seen_replies'.
- */
- unsigned int seen_replies_count;
- /**
- * Desired replication level
- */
- uint32_t replication;
- /**
- * Any message options for this request
- */
- uint32_t msg_options;
- /**
- * The type for the data for the GET request.
- */
- enum GNUNET_BLOCK_Type type;
- };
- /**
- * Struct containing paremeters of monitoring requests.
- */
- struct ClientMonitorRecord
- {
- /**
- * Next element in DLL.
- */
- struct ClientMonitorRecord *next;
- /**
- * Previous element in DLL.
- */
- struct ClientMonitorRecord *prev;
- /**
- * Type of blocks that are of interest
- */
- enum GNUNET_BLOCK_Type type;
- /**
- * Key of data of interest, NULL for all.
- */
- struct GNUNET_HashCode *key;
- /**
- * Flag whether to notify about GET messages.
- */
- int16_t get;
- /**
- * Flag whether to notify about GET_REPONSE messages.
- */
- int16_t get_resp;
- /**
- * Flag whether to notify about PUT messages.
- */
- uint16_t put;
- /**
- * Client to notify of these requests.
- */
- struct ClientList *client;
- };
- /**
- * List of active clients.
- */
- static struct ClientList *client_head;
- /**
- * List of active clients.
- */
- static struct ClientList *client_tail;
- /**
- * List of active monitoring requests.
- */
- static struct ClientMonitorRecord *monitor_head;
- /**
- * List of active monitoring requests.
- */
- static struct ClientMonitorRecord *monitor_tail;
- /**
- * Hashmap for fast key based lookup, maps keys to `struct ClientQueryRecord` entries.
- */
- static struct GNUNET_CONTAINER_MultiHashMap *forward_map;
- /**
- * Heap with all of our client's request, sorted by retry time (earliest on top).
- */
- static struct GNUNET_CONTAINER_Heap *retry_heap;
- /**
- * Task that re-transmits requests (using retry_heap).
- */
- static GNUNET_SCHEDULER_TaskIdentifier retry_task;
- /**
- * Task run to check for messages that need to be sent to a client.
- *
- * @param client a ClientList, containing the client and any messages to be sent to it
- */
- static void
- process_pending_messages (struct ClientList *client);
- /**
- * Add a PendingMessage to the clients list of messages to be sent
- *
- * @param client the active client to send the message to
- * @param pending_message the actual message to send
- */
- static void
- add_pending_message (struct ClientList *client,
- struct PendingMessage *pending_message)
- {
- GNUNET_CONTAINER_DLL_insert_tail (client->pending_head, client->pending_tail,
- pending_message);
- process_pending_messages (client);
- }
- /**
- * Find a client if it exists, add it otherwise.
- *
- * @param client the server handle to the client
- *
- * @return the client if found, a new client otherwise
- */
- static struct ClientList *
- find_active_client (struct GNUNET_SERVER_Client *client)
- {
- struct ClientList *pos = client_head;
- struct ClientList *ret;
- while (pos != NULL)
- {
- if (pos->client_handle == client)
- return pos;
- pos = pos->next;
- }
- ret = GNUNET_new (struct ClientList);
- ret->client_handle = client;
- GNUNET_CONTAINER_DLL_insert (client_head, client_tail, ret);
- return ret;
- }
- /**
- * Iterator over hash map entries that frees all entries
- * associated with the given client.
- *
- * @param cls client to search for in source routes
- * @param key current key code (ignored)
- * @param value value in the hash map, a ClientQueryRecord
- * @return #GNUNET_YES (we should continue to iterate)
- */
- static int
- remove_client_records (void *cls, const struct GNUNET_HashCode * key, void *value)
- {
- struct ClientList *client = cls;
- struct ClientQueryRecord *record = value;
- if (record->client != client)
- return GNUNET_YES;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Removing client %p's record for key %s\n", client,
- GNUNET_h2s (key));
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (forward_map, key,
- record));
- if (NULL != record->hnode)
- GNUNET_CONTAINER_heap_remove_node (record->hnode);
- GNUNET_array_grow (record->seen_replies, record->seen_replies_count, 0);
- GNUNET_free (record);
- return GNUNET_YES;
- }
- /**
- * Functions with this signature are called whenever a client
- * is disconnected on the network level.
- *
- * @param cls closure (NULL for dht)
- * @param client identification of the client; NULL
- * for the last call when the server is destroyed
- */
- static void
- handle_client_disconnect (void *cls,
- struct GNUNET_SERVER_Client *client)
- {
- struct ClientList *pos;
- struct PendingMessage *reply;
- struct ClientMonitorRecord *monitor;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Local client %p disconnects\n",
- client);
- pos = find_active_client (client);
- GNUNET_CONTAINER_DLL_remove (client_head, client_tail, pos);
- if (pos->transmit_handle != NULL)
- GNUNET_SERVER_notify_transmit_ready_cancel (pos->transmit_handle);
- while (NULL != (reply = pos->pending_head))
- {
- GNUNET_CONTAINER_DLL_remove (pos->pending_head, pos->pending_tail, reply);
- GNUNET_free (reply);
- }
- monitor = monitor_head;
- while (NULL != monitor)
- {
- if (monitor->client == pos)
- {
- struct ClientMonitorRecord *next;
- GNUNET_free_non_null (monitor->key);
- next = monitor->next;
- GNUNET_CONTAINER_DLL_remove (monitor_head, monitor_tail, monitor);
- GNUNET_free (monitor);
- monitor = next;
- }
- else
- monitor = monitor->next;
- }
- GNUNET_CONTAINER_multihashmap_iterate (forward_map, &remove_client_records,
- pos);
- GNUNET_free (pos);
- }
- /**
- * Route the given request via the DHT. This includes updating
- * the bloom filter and retransmission times, building the P2P
- * message and initiating the routing operation.
- */
- static void
- transmit_request (struct ClientQueryRecord *cqr)
- {
- int32_t reply_bf_mutator;
- struct GNUNET_CONTAINER_BloomFilter *reply_bf;
- struct GNUNET_CONTAINER_BloomFilter *peer_bf;
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# GET requests from clients injected"), 1,
- GNUNET_NO);
- reply_bf_mutator =
- (int32_t) GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
- UINT32_MAX);
- reply_bf =
- GNUNET_BLOCK_construct_bloomfilter (reply_bf_mutator, cqr->seen_replies,
- cqr->seen_replies_count);
- peer_bf =
- GNUNET_CONTAINER_bloomfilter_init (NULL, DHT_BLOOM_SIZE,
- GNUNET_CONSTANTS_BLOOMFILTER_K);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Initiating GET for %s, replication %u, already have %u replies\n",
- GNUNET_h2s (&cqr->key),
- cqr->replication,
- cqr->seen_replies_count);
- GDS_NEIGHBOURS_handle_get (cqr->type, cqr->msg_options, cqr->replication,
- 0 /* hop count */ ,
- &cqr->key, cqr->xquery, cqr->xquery_size, reply_bf,
- reply_bf_mutator, peer_bf);
- GNUNET_CONTAINER_bloomfilter_free (reply_bf);
- GNUNET_CONTAINER_bloomfilter_free (peer_bf);
- /* exponential back-off for retries.
- * max GNUNET_TIME_STD_EXPONENTIAL_BACKOFF_THRESHOLD (15 min) */
- cqr->retry_frequency = GNUNET_TIME_STD_BACKOFF (cqr->retry_frequency);
- cqr->retry_time = GNUNET_TIME_relative_to_absolute (cqr->retry_frequency);
- }
- /**
- * Task that looks at the 'retry_heap' and transmits all of the requests
- * on the heap that are ready for transmission. Then re-schedules
- * itself (unless the heap is empty).
- *
- * @param cls unused
- * @param tc scheduler context
- */
- static void
- transmit_next_request_task (void *cls,
- const struct GNUNET_SCHEDULER_TaskContext *tc)
- {
- struct ClientQueryRecord *cqr;
- struct GNUNET_TIME_Relative delay;
- retry_task = GNUNET_SCHEDULER_NO_TASK;
- if (0 != (tc->reason & GNUNET_SCHEDULER_REASON_SHUTDOWN))
- return;
- while (NULL != (cqr = GNUNET_CONTAINER_heap_remove_root (retry_heap)))
- {
- cqr->hnode = NULL;
- delay = GNUNET_TIME_absolute_get_remaining (cqr->retry_time);
- if (delay.rel_value_us > 0)
- {
- cqr->hnode =
- GNUNET_CONTAINER_heap_insert (retry_heap, cqr,
- cqr->retry_time.abs_value_us);
- retry_task =
- GNUNET_SCHEDULER_add_delayed (delay, &transmit_next_request_task,
- NULL);
- return;
- }
- transmit_request (cqr);
- cqr->hnode =
- GNUNET_CONTAINER_heap_insert (retry_heap, cqr,
- cqr->retry_time.abs_value_us);
- }
- }
- /**
- * Handler for PUT messages.
- *
- * @param cls closure for the service
- * @param client the client we received this message from
- * @param message the actual message received
- */
- static void
- handle_dht_local_put (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
- {
- const struct GNUNET_DHT_ClientPutMessage *dht_msg;
- struct GNUNET_CONTAINER_BloomFilter *peer_bf;
- uint16_t size;
- struct PendingMessage *pm;
- struct GNUNET_DHT_ClientPutConfirmationMessage *conf;
- size = ntohs (message->size);
- if (size < sizeof (struct GNUNET_DHT_ClientPutMessage))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# PUT requests received from clients"), 1,
- GNUNET_NO);
- dht_msg = (const struct GNUNET_DHT_ClientPutMessage *) message;
- LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG, "R5N CLIENT-PUT %s\n",
- GNUNET_h2s_full (&dht_msg->key));
- /* give to local clients */
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Handling local PUT of %u-bytes for query %s\n",
- size - sizeof (struct GNUNET_DHT_ClientPutMessage),
- GNUNET_h2s (&dht_msg->key));
- GDS_CLIENTS_handle_reply (GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
- &dht_msg->key, 0, NULL, 0, NULL,
- ntohl (dht_msg->type),
- size - sizeof (struct GNUNET_DHT_ClientPutMessage),
- &dht_msg[1]);
- /* store locally */
- GDS_DATACACHE_handle_put (GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
- &dht_msg->key, 0, NULL, ntohl (dht_msg->type),
- size - sizeof (struct GNUNET_DHT_ClientPutMessage),
- &dht_msg[1]);
- /* route to other peers */
- peer_bf =
- GNUNET_CONTAINER_bloomfilter_init (NULL, DHT_BLOOM_SIZE,
- GNUNET_CONSTANTS_BLOOMFILTER_K);
- GDS_NEIGHBOURS_handle_put (ntohl (dht_msg->type), ntohl (dht_msg->options),
- ntohl (dht_msg->desired_replication_level),
- GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
- 0 /* hop count */ ,
- peer_bf, &dht_msg->key, 0, NULL, &dht_msg[1],
- size -
- sizeof (struct GNUNET_DHT_ClientPutMessage));
- GDS_CLIENTS_process_put (ntohl (dht_msg->options),
- ntohl (dht_msg->type),
- 0,
- ntohl (dht_msg->desired_replication_level),
- 1,
- GDS_NEIGHBOURS_get_id(),
- GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
- &dht_msg->key,
- &dht_msg[1],
- size - sizeof (struct GNUNET_DHT_ClientPutMessage));
- GNUNET_CONTAINER_bloomfilter_free (peer_bf);
- pm = GNUNET_malloc (sizeof (struct PendingMessage) +
- sizeof (struct GNUNET_DHT_ClientPutConfirmationMessage));
- conf = (struct GNUNET_DHT_ClientPutConfirmationMessage *) &pm[1];
- conf->header.size = htons (sizeof (struct GNUNET_DHT_ClientPutConfirmationMessage));
- conf->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT_OK);
- conf->reserved = htonl (0);
- conf->unique_id = dht_msg->unique_id;
- pm->msg = &conf->header;
- add_pending_message (find_active_client (client), pm);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- }
- /**
- * Handler for DHT GET messages from the client.
- *
- * @param cls closure for the service
- * @param client the client we received this message from
- * @param message the actual message received
- */
- static void
- handle_dht_local_get (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
- {
- const struct GNUNET_DHT_ClientGetMessage *get;
- struct ClientQueryRecord *cqr;
- size_t xquery_size;
- const char *xquery;
- uint16_t size;
- size = ntohs (message->size);
- if (size < sizeof (struct GNUNET_DHT_ClientGetMessage))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- xquery_size = size - sizeof (struct GNUNET_DHT_ClientGetMessage);
- get = (const struct GNUNET_DHT_ClientGetMessage *) message;
- xquery = (const char *) &get[1];
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# GET requests received from clients"), 1,
- GNUNET_NO);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Received GET request for %s from local client %p, xq: %.*s\n",
- GNUNET_h2s (&get->key), client, xquery_size, xquery);
- LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG, "R5N CLIENT-GET %s\n",
- GNUNET_h2s_full (&get->key));
- cqr = GNUNET_malloc (sizeof (struct ClientQueryRecord) + xquery_size);
- cqr->key = get->key;
- cqr->client = find_active_client (client);
- cqr->xquery = (void *) &cqr[1];
- memcpy (&cqr[1], xquery, xquery_size);
- cqr->hnode = GNUNET_CONTAINER_heap_insert (retry_heap, cqr, 0);
- cqr->retry_frequency = GNUNET_TIME_UNIT_SECONDS;
- cqr->retry_time = GNUNET_TIME_absolute_get ();
- cqr->unique_id = get->unique_id;
- cqr->xquery_size = xquery_size;
- cqr->replication = ntohl (get->desired_replication_level);
- cqr->msg_options = ntohl (get->options);
- cqr->type = ntohl (get->type);
- // FIXME use cqr->key, set multihashmap create to GNUNET_YES
- GNUNET_CONTAINER_multihashmap_put (forward_map, &get->key, cqr,
- GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE);
- GDS_CLIENTS_process_get (ntohl (get->options),
- ntohl (get->type),
- 0,
- ntohl (get->desired_replication_level),
- 1,
- GDS_NEIGHBOURS_get_id(),
- &get->key);
- /* start remote requests */
- if (GNUNET_SCHEDULER_NO_TASK != retry_task)
- GNUNET_SCHEDULER_cancel (retry_task);
- retry_task = GNUNET_SCHEDULER_add_now (&transmit_next_request_task, NULL);
- /* perform local lookup */
- GDS_DATACACHE_handle_get (&get->key, cqr->type, cqr->xquery, xquery_size,
- NULL, 0);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- }
- /**
- * Closure for 'find_by_unique_id'.
- */
- struct FindByUniqueIdContext
- {
- /**
- * Where to store the result, if found.
- */
- struct ClientQueryRecord *cqr;
- uint64_t unique_id;
- };
- /**
- * Function called for each existing DHT record for the given
- * query. Checks if it matches the UID given in the closure
- * and if so returns the entry as a result.
- *
- * @param cls the search context
- * @param key query for the lookup (not used)
- * @param value the 'struct ClientQueryRecord'
- * @return GNUNET_YES to continue iteration (result not yet found)
- */
- static int
- find_by_unique_id (void *cls,
- const struct GNUNET_HashCode *key,
- void *value)
- {
- struct FindByUniqueIdContext *fui_ctx = cls;
- struct ClientQueryRecord *cqr = value;
- if (cqr->unique_id != fui_ctx->unique_id)
- return GNUNET_YES;
- fui_ctx->cqr = cqr;
- return GNUNET_NO;
- }
- /**
- * Handler for "GET result seen" messages from the client.
- *
- * @param cls closure for the service
- * @param client the client we received this message from
- * @param message the actual message received
- */
- static void
- handle_dht_local_get_result_seen (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
- {
- const struct GNUNET_DHT_ClientGetResultSeenMessage *seen;
- uint16_t size;
- unsigned int hash_count;
- unsigned int old_count;
- const struct GNUNET_HashCode *hc;
- struct FindByUniqueIdContext fui_ctx;
- struct ClientQueryRecord *cqr;
- size = ntohs (message->size);
- if (size < sizeof (struct GNUNET_DHT_ClientGetResultSeenMessage))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- seen = (const struct GNUNET_DHT_ClientGetResultSeenMessage *) message;
- hash_count = (size - sizeof (struct GNUNET_DHT_ClientGetResultSeenMessage)) / sizeof (struct GNUNET_HashCode);
- if (size != sizeof (struct GNUNET_DHT_ClientGetResultSeenMessage) + hash_count * sizeof (struct GNUNET_HashCode))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- hc = (const struct GNUNET_HashCode*) &seen[1];
- fui_ctx.unique_id = seen->unique_id;
- fui_ctx.cqr = NULL;
- GNUNET_CONTAINER_multihashmap_get_multiple (forward_map,
- &seen->key,
- &find_by_unique_id,
- &fui_ctx);
- if (NULL == (cqr = fui_ctx.cqr))
- {
- GNUNET_break (0);
- GNUNET_SERVER_receive_done (client, GNUNET_SYSERR);
- return;
- }
- /* finally, update 'seen' list */
- old_count = cqr->seen_replies_count;
- GNUNET_array_grow (cqr->seen_replies,
- cqr->seen_replies_count,
- cqr->seen_replies_count + hash_count);
- memcpy (&cqr->seen_replies[old_count],
- hc,
- sizeof (struct GNUNET_HashCode) * hash_count);
- }
- /**
- * Closure for 'remove_by_unique_id'.
- */
- struct RemoveByUniqueIdContext
- {
- /**
- * Client that issued the removal request.
- */
- struct ClientList *client;
- /**
- * Unique ID of the request.
- */
- uint64_t unique_id;
- };
- /**
- * Iterator over hash map entries that frees all entries
- * that match the given client and unique ID.
- *
- * @param cls unique ID and client to search for in source routes
- * @param key current key code
- * @param value value in the hash map, a ClientQueryRecord
- * @return GNUNET_YES (we should continue to iterate)
- */
- static int
- remove_by_unique_id (void *cls, const struct GNUNET_HashCode * key, void *value)
- {
- const struct RemoveByUniqueIdContext *ctx = cls;
- struct ClientQueryRecord *record = value;
- if (record->unique_id != ctx->unique_id)
- return GNUNET_YES;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Removing client %p's record for key %s (by unique id)\n",
- ctx->client->client_handle, GNUNET_h2s (key));
- return remove_client_records (ctx->client, key, record);
- }
- /**
- * Handler for any generic DHT stop messages, calls the appropriate handler
- * depending on message type (if processed locally)
- *
- * @param cls closure for the service
- * @param client the client we received this message from
- * @param message the actual message received
- *
- */
- static void
- handle_dht_local_get_stop (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
- {
- const struct GNUNET_DHT_ClientGetStopMessage *dht_stop_msg =
- (const struct GNUNET_DHT_ClientGetStopMessage *) message;
- struct RemoveByUniqueIdContext ctx;
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# GET STOP requests received from clients"), 1,
- GNUNET_NO);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Received GET STOP request for %s from local client %p\n",
- client, GNUNET_h2s (&dht_stop_msg->key));
- ctx.client = find_active_client (client);
- ctx.unique_id = dht_stop_msg->unique_id;
- GNUNET_CONTAINER_multihashmap_get_multiple (forward_map, &dht_stop_msg->key,
- &remove_by_unique_id, &ctx);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- }
- /**
- * Handler for monitor start messages
- *
- * @param cls closure for the service
- * @param client the client we received this message from
- * @param message the actual message received
- *
- */
- static void
- handle_dht_local_monitor (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
- {
- struct ClientMonitorRecord *r;
- const struct GNUNET_DHT_MonitorStartStopMessage *msg;
- msg = (struct GNUNET_DHT_MonitorStartStopMessage *) message;
- r = GNUNET_new (struct ClientMonitorRecord);
- r->client = find_active_client(client);
- r->type = ntohl(msg->type);
- r->get = ntohs(msg->get);
- r->get_resp = ntohs(msg->get_resp);
- r->put = ntohs(msg->put);
- if (0 == ntohs(msg->filter_key))
- r->key = NULL;
- else
- {
- r->key = GNUNET_new (struct GNUNET_HashCode);
- memcpy (r->key, &msg->key, sizeof (struct GNUNET_HashCode));
- }
- GNUNET_CONTAINER_DLL_insert (monitor_head, monitor_tail, r);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- }
- /**
- * Handler for monitor stop messages
- *
- * @param cls closure for the service
- * @param client the client we received this message from
- * @param message the actual message received
- *
- */
- static void
- handle_dht_local_monitor_stop (void *cls, struct GNUNET_SERVER_Client *client,
- const struct GNUNET_MessageHeader *message)
- {
- struct ClientMonitorRecord *r;
- const struct GNUNET_DHT_MonitorStartStopMessage *msg;
- int keys_match;
- msg = (struct GNUNET_DHT_MonitorStartStopMessage *) message;
- r = monitor_head;
- while (NULL != r)
- {
- if (NULL == r->key)
- keys_match = (0 == ntohs(msg->filter_key));
- else
- {
- keys_match = (0 != ntohs(msg->filter_key)
- && !memcmp(r->key, &msg->key, sizeof(struct GNUNET_HashCode)));
- }
- if (find_active_client(client) == r->client
- && ntohl(msg->type) == r->type
- && r->get == msg->get
- && r->get_resp == msg->get_resp
- && r->put == msg->put
- && keys_match
- )
- {
- GNUNET_CONTAINER_DLL_remove (monitor_head, monitor_tail, r);
- GNUNET_free_non_null (r->key);
- GNUNET_free (r);
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- return; /* Delete only ONE entry */
- }
- r = r->next;
- }
- GNUNET_SERVER_receive_done (client, GNUNET_OK);
- }
- /**
- * Callback called as a result of issuing a GNUNET_SERVER_notify_transmit_ready
- * request. A ClientList is passed as closure, take the head of the list
- * and copy it into buf, which has the result of sending the message to the
- * client.
- *
- * @param cls closure to this call
- * @param size maximum number of bytes available to send
- * @param buf where to copy the actual message to
- *
- * @return the number of bytes actually copied, 0 indicates failure
- */
- static size_t
- send_reply_to_client (void *cls, size_t size, void *buf)
- {
- struct ClientList *client = cls;
- char *cbuf = buf;
- struct PendingMessage *reply;
- size_t off;
- size_t msize;
- client->transmit_handle = NULL;
- if (buf == NULL)
- {
- /* client disconnected */
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Client %p disconnected, pending messages will be discarded\n",
- client->client_handle);
- return 0;
- }
- off = 0;
- while ((NULL != (reply = client->pending_head)) &&
- (size >= off + (msize = ntohs (reply->msg->size))))
- {
- GNUNET_CONTAINER_DLL_remove (client->pending_head, client->pending_tail,
- reply);
- memcpy (&cbuf[off], reply->msg, msize);
- GNUNET_free (reply);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitting %u bytes to client %p\n",
- msize, client->client_handle);
- off += msize;
- }
- process_pending_messages (client);
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Transmitted %u/%u bytes to client %p\n",
- (unsigned int) off, (unsigned int) size, client->client_handle);
- return off;
- }
- /**
- * Task run to check for messages that need to be sent to a client.
- *
- * @param client a ClientList, containing the client and any messages to be sent to it
- */
- static void
- process_pending_messages (struct ClientList *client)
- {
- if ((client->pending_head == NULL) || (client->transmit_handle != NULL))
- {
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Not asking for transmission to %p now: %s\n",
- client->client_handle,
- client->pending_head ==
- NULL ? "no more messages" : "request already pending");
- return;
- }
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Asking for transmission of %u bytes to client %p\n",
- ntohs (client->pending_head->msg->size), client->client_handle);
- client->transmit_handle =
- GNUNET_SERVER_notify_transmit_ready (client->client_handle,
- ntohs (client->pending_head->
- msg->size),
- GNUNET_TIME_UNIT_FOREVER_REL,
- &send_reply_to_client, client);
- }
- /**
- * Closure for 'forward_reply'
- */
- struct ForwardReplyContext
- {
- /**
- * Actual message to send to matching clients.
- */
- struct PendingMessage *pm;
- /**
- * Embedded payload.
- */
- const void *data;
- /**
- * Type of the data.
- */
- enum GNUNET_BLOCK_Type type;
- /**
- * Number of bytes in data.
- */
- size_t data_size;
- /**
- * Do we need to copy 'pm' because it was already used?
- */
- int do_copy;
- };
- /**
- * Iterator over hash map entries that send a given reply to
- * each of the matching clients. With some tricky recycling
- * of the buffer.
- *
- * @param cls the 'struct ForwardReplyContext'
- * @param key current key
- * @param value value in the hash map, a ClientQueryRecord
- * @return GNUNET_YES (we should continue to iterate),
- * if the result is mal-formed, GNUNET_NO
- */
- static int
- forward_reply (void *cls, const struct GNUNET_HashCode * key, void *value)
- {
- struct ForwardReplyContext *frc = cls;
- struct ClientQueryRecord *record = value;
- struct PendingMessage *pm;
- struct GNUNET_DHT_ClientResultMessage *reply;
- enum GNUNET_BLOCK_EvaluationResult eval;
- int do_free;
- struct GNUNET_HashCode ch;
- unsigned int i;
- LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG,
- "R5N CLIENT-RESULT %s\n",
- GNUNET_h2s_full (key));
- if ((record->type != GNUNET_BLOCK_TYPE_ANY) && (record->type != frc->type))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Record type missmatch, not passing request for key %s to local client\n",
- GNUNET_h2s (key));
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# Key match, type mismatches in REPLY to CLIENT"),
- 1, GNUNET_NO);
- return GNUNET_YES; /* type mismatch */
- }
- GNUNET_CRYPTO_hash (frc->data, frc->data_size, &ch);
- for (i = 0; i < record->seen_replies_count; i++)
- if (0 == memcmp (&record->seen_replies[i], &ch, sizeof (struct GNUNET_HashCode)))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Duplicate reply, not passing request for key %s to local client\n",
- GNUNET_h2s (key));
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# Duplicate REPLIES to CLIENT request dropped"),
- 1, GNUNET_NO);
- return GNUNET_YES; /* duplicate */
- }
- eval =
- GNUNET_BLOCK_evaluate (GDS_block_context, record->type, key, NULL, 0,
- record->xquery, record->xquery_size, frc->data,
- frc->data_size);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Evaluation result is %d for key %s for local client's query\n",
- (int) eval, GNUNET_h2s (key));
- switch (eval)
- {
- case GNUNET_BLOCK_EVALUATION_OK_LAST:
- do_free = GNUNET_YES;
- break;
- case GNUNET_BLOCK_EVALUATION_OK_MORE:
- GNUNET_array_append (record->seen_replies, record->seen_replies_count, ch);
- do_free = GNUNET_NO;
- break;
- case GNUNET_BLOCK_EVALUATION_OK_DUPLICATE:
- /* should be impossible to encounter here */
- GNUNET_break (0);
- return GNUNET_YES;
- case GNUNET_BLOCK_EVALUATION_RESULT_INVALID:
- GNUNET_break_op (0);
- return GNUNET_NO;
- case GNUNET_BLOCK_EVALUATION_REQUEST_VALID:
- GNUNET_break (0);
- return GNUNET_NO;
- case GNUNET_BLOCK_EVALUATION_REQUEST_INVALID:
- GNUNET_break (0);
- return GNUNET_NO;
- case GNUNET_BLOCK_EVALUATION_RESULT_IRRELEVANT:
- return GNUNET_YES;
- case GNUNET_BLOCK_EVALUATION_TYPE_NOT_SUPPORTED:
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Unsupported block type (%u) in request!\n"), record->type);
- return GNUNET_NO;
- default:
- GNUNET_break (0);
- return GNUNET_NO;
- }
- if (GNUNET_NO == frc->do_copy)
- {
- /* first time, we can use the original data */
- pm = frc->pm;
- frc->do_copy = GNUNET_YES;
- }
- else
- {
- /* two clients waiting for same reply, must copy for queueing */
- pm = GNUNET_malloc (sizeof (struct PendingMessage) +
- ntohs (frc->pm->msg->size));
- memcpy (pm, frc->pm,
- sizeof (struct PendingMessage) + ntohs (frc->pm->msg->size));
- pm->next = pm->prev = NULL;
- pm->msg = (struct GNUNET_MessageHeader *) &pm[1];
- }
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop ("# RESULTS queued for clients"), 1,
- GNUNET_NO);
- reply = (struct GNUNET_DHT_ClientResultMessage *) &pm[1];
- reply->unique_id = record->unique_id;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Queueing reply to query %s for client %p\n",
- GNUNET_h2s (key),
- record->client->client_handle);
- add_pending_message (record->client, pm);
- if (GNUNET_YES == do_free)
- remove_client_records (record->client, key, record);
- return GNUNET_YES;
- }
- /**
- * Handle a reply we've received from another peer. If the reply
- * matches any of our pending queries, forward it to the respective
- * client(s).
- *
- * @param expiration when will the reply expire
- * @param key the query this reply is for
- * @param get_path_length number of peers in @a get_path
- * @param get_path path the reply took on get
- * @param put_path_length number of peers in @a put_path
- * @param put_path path the reply took on put
- * @param type type of the reply
- * @param data_size number of bytes in @a data
- * @param data application payload data
- */
- void
- GDS_CLIENTS_handle_reply (struct GNUNET_TIME_Absolute expiration,
- const struct GNUNET_HashCode *key,
- unsigned int get_path_length,
- const struct GNUNET_PeerIdentity *get_path,
- unsigned int put_path_length,
- const struct GNUNET_PeerIdentity *put_path,
- enum GNUNET_BLOCK_Type type, size_t data_size,
- const void *data)
- {
- struct ForwardReplyContext frc;
- struct PendingMessage *pm;
- struct GNUNET_DHT_ClientResultMessage *reply;
- struct GNUNET_PeerIdentity *paths;
- size_t msize;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "reply for key %s\n",
- GNUNET_h2s (key));
- if (NULL == GNUNET_CONTAINER_multihashmap_get (forward_map, key))
- {
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# REPLIES ignored for CLIENTS (no match)"), 1,
- GNUNET_NO);
- return; /* no matching request, fast exit! */
- }
- msize =
- sizeof (struct GNUNET_DHT_ClientResultMessage) + data_size +
- (get_path_length + put_path_length) * sizeof (struct GNUNET_PeerIdentity);
- if (msize >= GNUNET_SERVER_MAX_MESSAGE_SIZE)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("Could not pass reply to client, message too big!\n"));
- return;
- }
- pm = GNUNET_malloc (msize + sizeof (struct PendingMessage));
- reply = (struct GNUNET_DHT_ClientResultMessage *) &pm[1];
- pm->msg = &reply->header;
- reply->header.size = htons ((uint16_t) msize);
- reply->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT);
- reply->type = htonl (type);
- reply->get_path_length = htonl (get_path_length);
- reply->put_path_length = htonl (put_path_length);
- reply->unique_id = 0; /* filled in later */
- reply->expiration = GNUNET_TIME_absolute_hton (expiration);
- reply->key = *key;
- paths = (struct GNUNET_PeerIdentity *) &reply[1];
- memcpy (paths, put_path,
- sizeof (struct GNUNET_PeerIdentity) * put_path_length);
- memcpy (&paths[put_path_length], get_path,
- sizeof (struct GNUNET_PeerIdentity) * get_path_length);
- memcpy (&paths[get_path_length + put_path_length], data, data_size);
- frc.do_copy = GNUNET_NO;
- frc.pm = pm;
- frc.data = data;
- frc.data_size = data_size;
- frc.type = type;
- GNUNET_CONTAINER_multihashmap_get_multiple (forward_map, key, &forward_reply,
- &frc);
- if (GNUNET_NO == frc.do_copy)
- {
- /* did not match any of the requests, free! */
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop
- ("# REPLIES ignored for CLIENTS (no match)"), 1,
- GNUNET_NO);
- GNUNET_free (pm);
- }
- }
- /**
- * Check if some client is monitoring GET messages and notify
- * them in that case.
- *
- * @param options Options, for instance RecordRoute, DemultiplexEverywhere.
- * @param type The type of data in the request.
- * @param hop_count Hop count so far.
- * @param path_length number of entries in path (or 0 if not recorded).
- * @param path peers on the GET path (or NULL if not recorded).
- * @param desired_replication_level Desired replication level.
- * @param key Key of the requested data.
- */
- void
- GDS_CLIENTS_process_get (uint32_t options,
- enum GNUNET_BLOCK_Type type,
- uint32_t hop_count,
- uint32_t desired_replication_level,
- unsigned int path_length,
- const struct GNUNET_PeerIdentity *path,
- const struct GNUNET_HashCode * key)
- {
- struct ClientMonitorRecord *m;
- struct ClientList **cl;
- unsigned int cl_size;
- cl = NULL;
- cl_size = 0;
- for (m = monitor_head; NULL != m; m = m->next)
- {
- if ((GNUNET_BLOCK_TYPE_ANY == m->type || m->type == type) &&
- (NULL == m->key ||
- memcmp (key, m->key, sizeof(struct GNUNET_HashCode)) == 0))
- {
- struct PendingMessage *pm;
- struct GNUNET_DHT_MonitorGetMessage *mmsg;
- struct GNUNET_PeerIdentity *msg_path;
- size_t msize;
- unsigned int i;
- /* Don't send duplicates */
- for (i = 0; i < cl_size; i++)
- if (cl[i] == m->client)
- break;
- if (i < cl_size)
- continue;
- GNUNET_array_append (cl, cl_size, m->client);
- msize = path_length * sizeof (struct GNUNET_PeerIdentity);
- msize += sizeof (struct GNUNET_DHT_MonitorGetMessage);
- msize += sizeof (struct PendingMessage);
- pm = GNUNET_malloc (msize);
- mmsg = (struct GNUNET_DHT_MonitorGetMessage *) &pm[1];
- pm->msg = &mmsg->header;
- mmsg->header.size = htons (msize - sizeof (struct PendingMessage));
- mmsg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET);
- mmsg->options = htonl(options);
- mmsg->type = htonl(type);
- mmsg->hop_count = htonl(hop_count);
- mmsg->desired_replication_level = htonl(desired_replication_level);
- mmsg->get_path_length = htonl(path_length);
- memcpy (&mmsg->key, key, sizeof (struct GNUNET_HashCode));
- msg_path = (struct GNUNET_PeerIdentity *) &mmsg[1];
- if (path_length > 0)
- memcpy (msg_path, path,
- path_length * sizeof (struct GNUNET_PeerIdentity));
- add_pending_message (m->client, pm);
- }
- }
- GNUNET_free_non_null (cl);
- }
- /**
- * Check if some client is monitoring GET RESP messages and notify
- * them in that case.
- *
- * @param type The type of data in the result.
- * @param get_path Peers on GET 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 exp Expiration time of the data.
- * @param key Key of the data.
- * @param data Pointer to the result data.
- * @param size Number of bytes in data.
- */
- void
- GDS_CLIENTS_process_get_resp (enum GNUNET_BLOCK_Type type,
- const struct GNUNET_PeerIdentity *get_path,
- unsigned int get_path_length,
- const struct GNUNET_PeerIdentity *put_path,
- unsigned int put_path_length,
- struct GNUNET_TIME_Absolute exp,
- const struct GNUNET_HashCode * key,
- const void *data,
- size_t size)
- {
- struct ClientMonitorRecord *m;
- struct ClientList **cl;
- unsigned int cl_size;
- cl = NULL;
- cl_size = 0;
- for (m = monitor_head; NULL != m; m = m->next)
- {
- if ((GNUNET_BLOCK_TYPE_ANY == m->type || m->type == type) &&
- (NULL == m->key ||
- memcmp (key, m->key, sizeof(struct GNUNET_HashCode)) == 0))
- {
- struct PendingMessage *pm;
- struct GNUNET_DHT_MonitorGetRespMessage *mmsg;
- struct GNUNET_PeerIdentity *path;
- size_t msize;
- unsigned int i;
- /* Don't send duplicates */
- for (i = 0; i < cl_size; i++)
- if (cl[i] == m->client)
- break;
- if (i < cl_size)
- continue;
- GNUNET_array_append (cl, cl_size, m->client);
- msize = size;
- msize += (get_path_length + put_path_length)
- * sizeof (struct GNUNET_PeerIdentity);
- msize += sizeof (struct GNUNET_DHT_MonitorGetRespMessage);
- msize += sizeof (struct PendingMessage);
- pm = GNUNET_malloc (msize);
- mmsg = (struct GNUNET_DHT_MonitorGetRespMessage *) &pm[1];
- pm->msg = (struct GNUNET_MessageHeader *) mmsg;
- mmsg->header.size = htons (msize - sizeof (struct PendingMessage));
- mmsg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET_RESP);
- mmsg->type = htonl(type);
- mmsg->put_path_length = htonl(put_path_length);
- mmsg->get_path_length = htonl(get_path_length);
- path = (struct GNUNET_PeerIdentity *) &mmsg[1];
- if (put_path_length > 0)
- {
- memcpy (path, put_path,
- put_path_length * sizeof (struct GNUNET_PeerIdentity));
- path = &path[put_path_length];
- }
- if (get_path_length > 0)
- memcpy (path, get_path,
- get_path_length * sizeof (struct GNUNET_PeerIdentity));
- mmsg->expiration_time = GNUNET_TIME_absolute_hton(exp);
- memcpy (&mmsg->key, key, sizeof (struct GNUNET_HashCode));
- if (size > 0)
- memcpy (&path[get_path_length], data, size);
- add_pending_message (m->client, pm);
- }
- }
- GNUNET_free_non_null (cl);
- }
- /**
- * Check if some client is monitoring PUT messages and notify
- * them in that case.
- *
- * @param options Options, for instance RecordRoute, DemultiplexEverywhere.
- * @param type The type of data in the request.
- * @param hop_count Hop count so far.
- * @param path_length number of entries in path (or 0 if not recorded).
- * @param path peers on the PUT path (or NULL if not recorded).
- * @param desired_replication_level Desired replication level.
- * @param exp Expiration time of the data.
- * @param key Key under which data is to be stored.
- * @param data Pointer to the data carried.
- * @param size Number of bytes in data.
- */
- void
- GDS_CLIENTS_process_put (uint32_t options,
- enum GNUNET_BLOCK_Type type,
- uint32_t hop_count,
- uint32_t desired_replication_level,
- unsigned int path_length,
- const struct GNUNET_PeerIdentity *path,
- struct GNUNET_TIME_Absolute exp,
- const struct GNUNET_HashCode * key,
- const void *data,
- size_t size)
- {
- struct ClientMonitorRecord *m;
- struct ClientList **cl;
- unsigned int cl_size;
- cl = NULL;
- cl_size = 0;
- for (m = monitor_head; NULL != m; m = m->next)
- {
- if ((GNUNET_BLOCK_TYPE_ANY == m->type || m->type == type) &&
- (NULL == m->key ||
- memcmp (key, m->key, sizeof(struct GNUNET_HashCode)) == 0))
- {
- struct PendingMessage *pm;
- struct GNUNET_DHT_MonitorPutMessage *mmsg;
- struct GNUNET_PeerIdentity *msg_path;
- size_t msize;
- unsigned int i;
- /* Don't send duplicates */
- for (i = 0; i < cl_size; i++)
- if (cl[i] == m->client)
- break;
- if (i < cl_size)
- continue;
- GNUNET_array_append (cl, cl_size, m->client);
- msize = size;
- msize += path_length * sizeof (struct GNUNET_PeerIdentity);
- msize += sizeof (struct GNUNET_DHT_MonitorPutMessage);
- msize += sizeof (struct PendingMessage);
- pm = GNUNET_malloc (msize);
- mmsg = (struct GNUNET_DHT_MonitorPutMessage *) &pm[1];
- pm->msg = (struct GNUNET_MessageHeader *) mmsg;
- mmsg->header.size = htons (msize - sizeof (struct PendingMessage));
- mmsg->header.type = htons (GNUNET_MESSAGE_TYPE_DHT_MONITOR_PUT);
- mmsg->options = htonl(options);
- mmsg->type = htonl(type);
- mmsg->hop_count = htonl(hop_count);
- mmsg->desired_replication_level = htonl(desired_replication_level);
- mmsg->put_path_length = htonl(path_length);
- msg_path = (struct GNUNET_PeerIdentity *) &mmsg[1];
- if (path_length > 0)
- {
- memcpy (msg_path, path,
- path_length * sizeof (struct GNUNET_PeerIdentity));
- }
- mmsg->expiration_time = GNUNET_TIME_absolute_hton(exp);
- memcpy (&mmsg->key, key, sizeof (struct GNUNET_HashCode));
- if (size > 0)
- memcpy (&msg_path[path_length], data, size);
- add_pending_message (m->client, pm);
- }
- }
- GNUNET_free_non_null (cl);
- }
- /**
- * Initialize client subsystem.
- *
- * @param server the initialized server
- */
- void
- GDS_CLIENTS_init (struct GNUNET_SERVER_Handle *server)
- {
- static struct GNUNET_SERVER_MessageHandler plugin_handlers[] = {
- {&handle_dht_local_put, NULL,
- GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT, 0},
- {&handle_dht_local_get, NULL,
- GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET, 0},
- {&handle_dht_local_get_stop, NULL,
- GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_STOP,
- sizeof (struct GNUNET_DHT_ClientGetStopMessage)},
- {&handle_dht_local_monitor, NULL,
- GNUNET_MESSAGE_TYPE_DHT_MONITOR_START,
- sizeof (struct GNUNET_DHT_MonitorStartStopMessage)},
- {&handle_dht_local_monitor_stop, NULL,
- GNUNET_MESSAGE_TYPE_DHT_MONITOR_STOP,
- sizeof (struct GNUNET_DHT_MonitorStartStopMessage)},
- {&handle_dht_local_get_result_seen, NULL,
- GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_RESULTS_KNOWN, 0},
- {NULL, NULL, 0, 0}
- };
- forward_map = GNUNET_CONTAINER_multihashmap_create (1024, GNUNET_NO);
- retry_heap = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
- GNUNET_SERVER_add_handlers (server, plugin_handlers);
- GNUNET_SERVER_disconnect_notify (server, &handle_client_disconnect, NULL);
- }
- /**
- * Shutdown client subsystem.
- */
- void
- GDS_CLIENTS_done ()
- {
- GNUNET_assert (client_head == NULL);
- GNUNET_assert (client_tail == NULL);
- if (GNUNET_SCHEDULER_NO_TASK != retry_task)
- {
- GNUNET_SCHEDULER_cancel (retry_task);
- retry_task = GNUNET_SCHEDULER_NO_TASK;
- }
- if (NULL != retry_heap)
- {
- GNUNET_assert (0 == GNUNET_CONTAINER_heap_get_size (retry_heap));
- GNUNET_CONTAINER_heap_destroy (retry_heap);
- retry_heap = NULL;
- }
- if (NULL != forward_map)
- {
- GNUNET_assert (0 == GNUNET_CONTAINER_multihashmap_size (forward_map));
- GNUNET_CONTAINER_multihashmap_destroy (forward_map);
- forward_map = NULL;
- }
- }
- /* end of gnunet-service-dht_clients.c */
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