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- /*
- This file is part of GNUnet.
- Copyright (C) 2009, 2010, 2011, 2016, 2017 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
- */
- /**
- * @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_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__)
- /**
- * Struct containing information about a client,
- * handle to connect to it, and any pending messages
- * that need to be sent to it.
- */
- struct ClientHandle;
- /**
- * Entry in the local forwarding map for a client's GET request.
- */
- struct ClientQueryRecord
- {
- /**
- * The key this request was about
- */
- struct GNUNET_HashCode key;
- /**
- * Kept in a DLL with @e client.
- */
- struct ClientQueryRecord *next;
- /**
- * Kept in a DLL with @e client.
- */
- struct ClientQueryRecord *prev;
- /**
- * Client responsible for the request.
- */
- struct ClientHandle *ch;
- /**
- * 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 ClientHandle *ch;
- };
- /**
- * Struct containing information about a client,
- * handle to connect to it, and any pending messages
- * that need to be sent to it.
- */
- struct ClientHandle
- {
- /**
- * Linked list of active queries of this client.
- */
- struct ClientQueryRecord *cqr_head;
- /**
- * Linked list of active queries of this client.
- */
- struct ClientQueryRecord *cqr_tail;
- /**
- * The handle to this client
- */
- struct GNUNET_SERVICE_Client *client;
- /**
- * The message queue to this client
- */
- struct GNUNET_MQ_Handle *mq;
- };
- /**
- * Our handle to the BLOCK library.
- */
- struct GNUNET_BLOCK_Context *GDS_block_context;
- /**
- * Handle for the statistics service.
- */
- struct GNUNET_STATISTICS_Handle *GDS_stats;
- /**
- * Handle for the service.
- */
- struct GNUNET_SERVICE_Handle *GDS_service;
- /**
- * The configuration the DHT service is running with
- */
- const struct GNUNET_CONFIGURATION_Handle *GDS_cfg;
- /**
- * 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 struct GNUNET_SCHEDULER_Task *retry_task;
- /**
- * Free data structures associated with the given query.
- *
- * @param record record to remove
- */
- static void
- remove_client_record (struct ClientQueryRecord *record)
- {
- struct ClientHandle *ch = record->ch;
- GNUNET_CONTAINER_DLL_remove (ch->cqr_head,
- ch->cqr_tail,
- record);
- GNUNET_assert (GNUNET_YES ==
- GNUNET_CONTAINER_multihashmap_remove (forward_map,
- &record->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);
- }
- /**
- * Functions with this signature are called whenever a local client is
- * connects to us.
- *
- * @param cls closure (NULL for dht)
- * @param client identification of the client
- * @param mq message queue for talking to @a client
- * @return our `struct ClientHandle` for @a client
- */
- static void *
- client_connect_cb (void *cls,
- struct GNUNET_SERVICE_Client *client,
- struct GNUNET_MQ_Handle *mq)
- {
- struct ClientHandle *ch;
- ch = GNUNET_new (struct ClientHandle);
- ch->client = client;
- ch->mq = mq;
- return ch;
- }
- /**
- * 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
- * @param app_ctx our `struct ClientHandle` for @a client
- */
- static void
- client_disconnect_cb (void *cls,
- struct GNUNET_SERVICE_Client *client,
- void *app_ctx)
- {
- struct ClientHandle *ch = app_ctx;
- struct ClientQueryRecord *cqr;
- struct ClientMonitorRecord *monitor;
- GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
- "Local client %p disconnects\n",
- ch);
- monitor = monitor_head;
- while (NULL != monitor)
- {
- if (monitor->ch == ch)
- {
- struct ClientMonitorRecord *next;
- next = monitor->next;
- GNUNET_free_non_null (monitor->key);
- GNUNET_CONTAINER_DLL_remove (monitor_head,
- monitor_tail,
- monitor);
- GNUNET_free (monitor);
- monitor = next;
- }
- else
- {
- monitor = monitor->next;
- }
- }
- while (NULL != (cqr = ch->cqr_head))
- remove_client_record (cqr);
- GNUNET_free (ch);
- }
- /**
- * 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)
- {
- struct GNUNET_BLOCK_Group *bg;
- struct GNUNET_CONTAINER_BloomFilter *peer_bf;
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop ("# GET requests from clients injected"),
- 1,
- GNUNET_NO);
- bg = GNUNET_BLOCK_group_create (GDS_block_context,
- cqr->type,
- GNUNET_CRYPTO_random_u32 (GNUNET_CRYPTO_QUALITY_WEAK,
- UINT32_MAX),
- NULL,
- 0,
- "seen-set-size",
- cqr->seen_replies_count,
- NULL);
- GNUNET_BLOCK_group_set_seen (bg,
- 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,
- bg,
- peer_bf);
- GNUNET_BLOCK_group_destroy (bg);
- 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
- */
- static void
- transmit_next_request_task (void *cls)
- {
- struct ClientQueryRecord *cqr;
- struct GNUNET_TIME_Relative delay;
- retry_task = NULL;
- 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_at (cqr->retry_time,
- &transmit_next_request_task,
- NULL);
- return;
- }
- transmit_request (cqr);
- cqr->hnode
- = GNUNET_CONTAINER_heap_insert (retry_heap,
- cqr,
- cqr->retry_time.abs_value_us);
- }
- }
- /**
- * Check DHT PUT messages from the client.
- *
- * @param cls the client we received this message from
- * @param dht_msg the actual message received
- * @return #GNUNET_OK (always)
- */
- static int
- check_dht_local_put (void *cls,
- const struct GNUNET_DHT_ClientPutMessage *dht_msg)
- {
- /* always well-formed */
- return GNUNET_OK;
- }
- /**
- * Handler for PUT messages.
- *
- * @param cls the client we received this message from
- * @param dht_msg the actual message received
- */
- static void
- handle_dht_local_put (void *cls,
- const struct GNUNET_DHT_ClientPutMessage *dht_msg)
- {
- struct ClientHandle *ch = cls;
- struct GNUNET_CONTAINER_BloomFilter *peer_bf;
- uint16_t size;
- size = ntohs (dht_msg->header.size);
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop ("# PUT requests received from clients"),
- 1,
- GNUNET_NO);
- LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG,
- "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);
- GNUNET_SERVICE_client_continue (ch->client);
- }
- /**
- * Check DHT GET messages from the client.
- *
- * @param cls the client we received this message from
- * @param message the actual message received
- * @return #GNUNET_OK (always)
- */
- static int
- check_dht_local_get (void *cls,
- const struct GNUNET_DHT_ClientGetMessage *get)
- {
- /* always well-formed */
- return GNUNET_OK;
- }
- /**
- * Handle a result from local datacache for a GET operation.
- *
- * @param cls the `struct ClientHandle` of the client doing the query
- * @param type type of the block
- * @param expiration_time when does the content expire
- * @param key key for the content
- * @param put_path_length number of entries in @a put_path
- * @param put_path peers the original PUT traversed (if tracked)
- * @param get_path_length number of entries in @a get_path
- * @param get_path peers this reply has traversed so far (if tracked)
- * @param data payload of the reply
- * @param data_size number of bytes in @a data
- */
- static void
- handle_local_result (void *cls,
- enum GNUNET_BLOCK_Type type,
- struct GNUNET_TIME_Absolute expiration_time,
- const struct GNUNET_HashCode *key,
- unsigned int put_path_length,
- const struct GNUNET_PeerIdentity *put_path,
- unsigned int get_path_length,
- const struct GNUNET_PeerIdentity *get_path,
- const void *data,
- size_t data_size)
- {
- // FIXME: this needs some clean up: inline the function,
- // possibly avoid even looking up the client!
- GDS_CLIENTS_handle_reply (expiration_time,
- key,
- 0, NULL,
- put_path_length, put_path,
- type,
- data_size, data);
- }
- /**
- * Handler for DHT GET messages from the client.
- *
- * @param cls the client we received this message from
- * @param message the actual message received
- */
- static void
- handle_dht_local_get (void *cls,
- const struct GNUNET_DHT_ClientGetMessage *get)
- {
- struct ClientHandle *ch = cls;
- struct ClientQueryRecord *cqr;
- size_t xquery_size;
- const char *xquery;
- uint16_t size;
- size = ntohs (get->header.size);
- xquery_size = size - sizeof (struct GNUNET_DHT_ClientGetMessage);
- 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),
- ch->client,
- xquery_size,
- xquery);
- LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG,
- "CLIENT-GET %s\n",
- GNUNET_h2s_full (&get->key));
- cqr = GNUNET_malloc (sizeof (struct ClientQueryRecord) + xquery_size);
- cqr->key = get->key;
- cqr->ch = ch;
- cqr->xquery = (void *) &cqr[1];
- GNUNET_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);
- GNUNET_CONTAINER_DLL_insert (ch->cqr_head,
- ch->cqr_tail,
- cqr);
- GNUNET_CONTAINER_multihashmap_put (forward_map,
- &cqr->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 (NULL != 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,
- &handle_local_result,
- ch);
- GNUNET_SERVICE_client_continue (ch->client);
- }
- /**
- * 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;
- }
- /**
- * Check "GET result seen" messages from the client.
- *
- * @param cls the client we received this message from
- * @param message the actual message received
- * @return #GNUNET_OK if @a seen is well-formed
- */
- static int
- check_dht_local_get_result_seen (void *cls,
- const struct GNUNET_DHT_ClientGetResultSeenMessage *seen)
- {
- uint16_t size;
- unsigned int hash_count;
- size = ntohs (seen->header.size);
- 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);
- return GNUNET_SYSERR;
- }
- return GNUNET_OK;
- }
- /**
- * Handler for "GET result seen" messages from the client.
- *
- * @param cls the client we received this message from
- * @param message the actual message received
- */
- static void
- handle_dht_local_get_result_seen (void *cls,
- const struct GNUNET_DHT_ClientGetResultSeenMessage *seen)
- {
- struct ClientHandle *ch = cls;
- 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 (seen->header.size);
- hash_count = (size - sizeof (struct GNUNET_DHT_ClientGetResultSeenMessage)) / sizeof (struct GNUNET_HashCode);
- 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_SERVICE_client_drop (ch->client);
- 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);
- GNUNET_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 ClientHandle *ch;
- /**
- * 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 *cqr = value;
- if (cqr->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->ch->client,
- GNUNET_h2s (key));
- remove_client_record (cqr);
- return GNUNET_YES;
- }
- /**
- * Handler for any generic DHT stop messages, calls the appropriate handler
- * depending on message type (if processed locally)
- *
- * @param cls client we received this message from
- * @param message the actual message received
- *
- */
- static void
- handle_dht_local_get_stop (void *cls,
- const struct GNUNET_DHT_ClientGetStopMessage *dht_stop_msg)
- {
- struct ClientHandle *ch = cls;
- 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",
- GNUNET_h2s (&dht_stop_msg->key),
- ch->client);
- ctx.ch = ch;
- 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_SERVICE_client_continue (ch->client);
- }
- /**
- * Handler for monitor start messages
- *
- * @param cls the client we received this message from
- * @param msg the actual message received
- *
- */
- static void
- handle_dht_local_monitor (void *cls,
- const struct GNUNET_DHT_MonitorStartStopMessage *msg)
- {
- struct ClientHandle *ch = cls;
- struct ClientMonitorRecord *r;
- r = GNUNET_new (struct ClientMonitorRecord);
- r->ch = ch;
- 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);
- GNUNET_memcpy (r->key,
- &msg->key,
- sizeof (struct GNUNET_HashCode));
- }
- GNUNET_CONTAINER_DLL_insert (monitor_head,
- monitor_tail,
- r);
- GNUNET_SERVICE_client_continue (ch->client);
- }
- /**
- * Handler for monitor stop messages
- *
- * @param cls the client we received this message from
- * @param msg the actual message received
- */
- static void
- handle_dht_local_monitor_stop (void *cls,
- const struct GNUNET_DHT_MonitorStartStopMessage *msg)
- {
- struct ClientHandle *ch = cls;
- struct ClientMonitorRecord *r;
- int keys_match;
- GNUNET_SERVICE_client_continue (ch->client);
- for (r = monitor_head; NULL != r; r = r->next)
- {
- 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 ( (ch == r->ch) &&
- (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);
- return; /* Delete only ONE entry */
- }
- }
- }
- /**
- * Closure for #forward_reply()
- */
- struct ForwardReplyContext
- {
- /**
- * Expiration time of the reply.
- */
- struct GNUNET_TIME_Absolute expiration;
- /**
- * GET path taken.
- */
- const struct GNUNET_PeerIdentity *get_path;
- /**
- * PUT path taken.
- */
- const struct GNUNET_PeerIdentity *put_path;
- /**
- * Embedded payload.
- */
- const void *data;
- /**
- * Number of bytes in data.
- */
- size_t data_size;
- /**
- * Number of entries in @e get_path.
- */
- unsigned int get_path_length;
- /**
- * Number of entries in @e put_path.
- */
- unsigned int put_path_length;
- /**
- * Type of the data.
- */
- enum GNUNET_BLOCK_Type type;
- };
- /**
- * 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 GNUNET_MQ_Envelope *env;
- struct GNUNET_DHT_ClientResultMessage *reply;
- enum GNUNET_BLOCK_EvaluationResult eval;
- int do_free;
- struct GNUNET_HashCode ch;
- struct GNUNET_PeerIdentity *paths;
- LOG_TRAFFIC (GNUNET_ERROR_TYPE_DEBUG,
- "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 mismatch, 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 (unsigned int 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,
- NULL,
- GNUNET_BLOCK_EO_NONE,
- key,
- 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;
- }
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop ("# RESULTS queued for clients"),
- 1,
- GNUNET_NO);
- env = GNUNET_MQ_msg_extra (reply,
- frc->data_size +
- (frc->get_path_length + frc->put_path_length) * sizeof (struct GNUNET_PeerIdentity),
- GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT);
- reply->type = htonl (frc->type);
- reply->get_path_length = htonl (frc->get_path_length);
- reply->put_path_length = htonl (frc->put_path_length);
- reply->unique_id = record->unique_id;
- reply->expiration = GNUNET_TIME_absolute_hton (frc->expiration);
- reply->key = *key;
- paths = (struct GNUNET_PeerIdentity *) &reply[1];
- GNUNET_memcpy (paths,
- frc->put_path,
- sizeof (struct GNUNET_PeerIdentity) * frc->put_path_length);
- GNUNET_memcpy (&paths[frc->put_path_length],
- frc->get_path,
- sizeof (struct GNUNET_PeerIdentity) * frc->get_path_length);
- GNUNET_memcpy (&paths[frc->get_path_length + frc->put_path_length],
- frc->data,
- frc->data_size);
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Sending reply to query %s for client %p\n",
- GNUNET_h2s (key),
- record->ch->client);
- GNUNET_MQ_send (record->ch->mq,
- env);
- if (GNUNET_YES == do_free)
- remove_client_record (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;
- size_t msize;
- msize = sizeof (struct GNUNET_DHT_ClientResultMessage) + data_size +
- (get_path_length + put_path_length) * sizeof (struct GNUNET_PeerIdentity);
- if (msize >= GNUNET_MAX_MESSAGE_SIZE)
- {
- GNUNET_break (0);
- return;
- }
- if (NULL == GNUNET_CONTAINER_multihashmap_get (forward_map,
- key))
- {
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "No matching client for reply for key %s\n",
- GNUNET_h2s (key));
- GNUNET_STATISTICS_update (GDS_stats,
- gettext_noop ("# REPLIES ignored for CLIENTS (no match)"),
- 1,
- GNUNET_NO);
- return; /* no matching request, fast exit! */
- }
- frc.expiration = expiration;
- frc.get_path = get_path;
- frc.put_path = put_path;
- frc.data = data;
- frc.data_size = data_size;
- frc.get_path_length = get_path_length;
- frc.put_path_length = put_path_length;
- frc.type = type;
- LOG (GNUNET_ERROR_TYPE_DEBUG,
- "Forwarding reply for key %s to client\n",
- GNUNET_h2s (key));
- GNUNET_CONTAINER_multihashmap_get_multiple (forward_map,
- key,
- &forward_reply,
- &frc);
- }
- /**
- * 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 ClientHandle **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) ||
- (0 == memcmp (key,
- m->key,
- sizeof(struct GNUNET_HashCode))) ) )
- {
- struct GNUNET_MQ_Envelope *env;
- 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->ch)
- break;
- if (i < cl_size)
- continue;
- GNUNET_array_append (cl,
- cl_size,
- m->ch);
- msize = path_length * sizeof (struct GNUNET_PeerIdentity);
- env = GNUNET_MQ_msg_extra (mmsg,
- msize,
- 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);
- mmsg->key = *key;
- msg_path = (struct GNUNET_PeerIdentity *) &mmsg[1];
- GNUNET_memcpy (msg_path,
- path,
- path_length * sizeof (struct GNUNET_PeerIdentity));
- GNUNET_MQ_send (m->ch->mq,
- env);
- }
- }
- 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 @a 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 ClientHandle **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 GNUNET_MQ_Envelope *env;
- 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->ch)
- break;
- if (i < cl_size)
- continue;
- GNUNET_array_append (cl,
- cl_size,
- m->ch);
- msize = size;
- msize += (get_path_length + put_path_length)
- * sizeof (struct GNUNET_PeerIdentity);
- env = GNUNET_MQ_msg_extra (mmsg,
- msize,
- 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);
- mmsg->expiration_time = GNUNET_TIME_absolute_hton(exp);
- mmsg->key = *key;
- path = (struct GNUNET_PeerIdentity *) &mmsg[1];
- GNUNET_memcpy (path,
- put_path,
- put_path_length * sizeof (struct GNUNET_PeerIdentity));
- GNUNET_memcpy (path,
- get_path,
- get_path_length * sizeof (struct GNUNET_PeerIdentity));
- GNUNET_memcpy (&path[get_path_length],
- data,
- size);
- GNUNET_MQ_send (m->ch->mq,
- env);
- }
- }
- 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 ClientHandle **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 GNUNET_MQ_Envelope *env;
- 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->ch)
- break;
- if (i < cl_size)
- continue;
- GNUNET_array_append (cl,
- cl_size,
- m->ch);
- msize = size;
- msize += path_length * sizeof (struct GNUNET_PeerIdentity);
- env = GNUNET_MQ_msg_extra (mmsg,
- msize,
- 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);
- mmsg->key = *key;
- mmsg->expiration_time = GNUNET_TIME_absolute_hton (exp);
- msg_path = (struct GNUNET_PeerIdentity *) &mmsg[1];
- GNUNET_memcpy (msg_path,
- path,
- path_length * sizeof (struct GNUNET_PeerIdentity));
- GNUNET_memcpy (&msg_path[path_length],
- data,
- size);
- GNUNET_MQ_send (m->ch->mq,
- env);
- }
- }
- GNUNET_free_non_null (cl);
- }
- /**
- * Initialize client subsystem.
- *
- * @param server the initialized server
- */
- static void
- GDS_CLIENTS_init ()
- {
- forward_map
- = GNUNET_CONTAINER_multihashmap_create (1024,
- GNUNET_YES);
- retry_heap
- = GNUNET_CONTAINER_heap_create (GNUNET_CONTAINER_HEAP_ORDER_MIN);
- }
- /**
- * Shutdown client subsystem.
- */
- static void
- GDS_CLIENTS_stop ()
- {
- if (NULL != retry_task)
- {
- GNUNET_SCHEDULER_cancel (retry_task);
- retry_task = NULL;
- }
- }
- /**
- * Define "main" method using service macro.
- *
- * @param name name of the service, i.e. "dht" or "xdht"
- * @param run name of the initializaton method for the service
- */
- #define GDS_DHT_SERVICE_INIT(name,run) \
- GNUNET_SERVICE_MAIN \
- (name, \
- GNUNET_SERVICE_OPTION_NONE, \
- run, \
- &client_connect_cb, \
- &client_disconnect_cb, \
- NULL, \
- GNUNET_MQ_hd_var_size (dht_local_put, \
- GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT, \
- struct GNUNET_DHT_ClientPutMessage, \
- NULL), \
- GNUNET_MQ_hd_var_size (dht_local_get, \
- GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET, \
- struct GNUNET_DHT_ClientGetMessage, \
- NULL), \
- GNUNET_MQ_hd_fixed_size (dht_local_get_stop, \
- GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_STOP, \
- struct GNUNET_DHT_ClientGetStopMessage, \
- NULL), \
- GNUNET_MQ_hd_fixed_size (dht_local_monitor, \
- GNUNET_MESSAGE_TYPE_DHT_MONITOR_START, \
- struct GNUNET_DHT_MonitorStartStopMessage, \
- NULL), \
- GNUNET_MQ_hd_fixed_size (dht_local_monitor_stop, \
- GNUNET_MESSAGE_TYPE_DHT_MONITOR_STOP, \
- struct GNUNET_DHT_MonitorStartStopMessage, \
- NULL), \
- GNUNET_MQ_hd_var_size (dht_local_get_result_seen, \
- GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_RESULTS_KNOWN, \
- struct GNUNET_DHT_ClientGetResultSeenMessage , \
- NULL), \
- GNUNET_MQ_handler_end ())
- /**
- * MINIMIZE heap size (way below 128k) since this process doesn't need much.
- */
- void __attribute__ ((destructor))
- GDS_CLIENTS_done ()
- {
- 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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