GNUnet 0.22.1
gnunet-service-dht_clients.c File Reference

GNUnet DHT service's client management code. More...

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Data Structures

struct  ClientQueryRecord
 Entry in the local forwarding map for a client's GET request. More...
 
struct  ClientMonitorRecord
 Struct containing parameters of monitoring requests. More...
 
struct  ClientHandle
 Struct containing information about a client, handle to connect to it, and any pending messages that need to be sent to it. More...
 
struct  FindByUniqueIdContext
 Closure for find_by_unique_id(). More...
 
struct  RemoveByUniqueIdContext
 Closure for remove_by_unique_id(). More...
 
struct  ForwardReplyContext
 Closure for forward_reply() More...
 
struct  GetActionContext
 Closure for get_action();. More...
 
struct  ResponseActionContext
 Closure for response_action(). More...
 
struct  PutActionContext
 Closure for put_action(). More...
 

Macros

#define SANITY_CHECKS   0
 Enable slow sanity checks to debug issues. More...
 
#define LOG_TRAFFIC(kind, ...)
 Should routing details be logged to stderr (for debugging)? More...
 
#define LOG(kind, ...)   GNUNET_log_from (kind, "dht-clients", __VA_ARGS__)
 
#define GDS_DHT_SERVICE_INIT(name, run)
 Define "main" method using service macro. More...
 

Typedefs

typedef void(* MonitorAction) (void *cls, struct ClientMonitorRecord *m)
 Function to call by for_matching_monitors(). More...
 

Functions

static void remove_client_query_record (struct ClientQueryRecord *record)
 Free data structures associated with the given query. More...
 
static void * client_connect_cb (void *cls, struct GNUNET_SERVICE_Client *client, struct GNUNET_MQ_Handle *mq)
 Functions with this signature are called whenever a local client is connects to us. More...
 
static void client_disconnect_cb (void *cls, struct GNUNET_SERVICE_Client *client, void *app_ctx)
 Functions with this signature are called whenever a client is disconnected on the network level. More...
 
static void transmit_request (struct ClientQueryRecord *cqr)
 Route the given request via the DHT. More...
 
static void transmit_next_request_task (void *cls)
 Task that looks at the retry_heap and transmits all of the requests on the heap that are ready for transmission. More...
 
static enum GNUNET_GenericReturnValue check_dht_local_put (void *cls, const struct GNUNET_DHT_ClientPutMessage *dht_msg)
 Check DHT PUT messages from the client. More...
 
static void handle_dht_local_put (void *cls, const struct GNUNET_DHT_ClientPutMessage *dht_msg)
 Handler for PUT messages. More...
 
static void handle_local_result (void *cls, const struct GNUNET_DATACACHE_Block *bd)
 Handle a result from local datacache for a GET operation. More...
 
static enum GNUNET_GenericReturnValue check_dht_local_get (void *cls, const struct GNUNET_DHT_ClientGetMessage *get)
 Check DHT GET messages from the client. More...
 
static void handle_dht_local_get (void *cls, const struct GNUNET_DHT_ClientGetMessage *get)
 Handler for DHT GET messages from the client. More...
 
static enum GNUNET_GenericReturnValue find_by_unique_id (void *cls, const struct GNUNET_HashCode *key, void *value)
 Function called for each existing DHT record for the given query. More...
 
static enum GNUNET_GenericReturnValue check_dht_local_get_result_seen (void *cls, const struct GNUNET_DHT_ClientGetResultSeenMessage *seen)
 Check "GET result seen" messages from the client. More...
 
static void handle_dht_local_get_result_seen (void *cls, const struct GNUNET_DHT_ClientGetResultSeenMessage *seen)
 Handler for "GET result seen" messages from the client. More...
 
static enum GNUNET_GenericReturnValue remove_by_unique_id (void *cls, const struct GNUNET_HashCode *key, void *value)
 Iterator over hash map entries that frees all entries that match the given client and unique ID. More...
 
static void handle_dht_local_get_stop (void *cls, const struct GNUNET_DHT_ClientGetStopMessage *dht_stop_msg)
 Handler for any generic DHT stop messages, calls the appropriate handler depending on message type (if processed locally) More...
 
static enum GNUNET_GenericReturnValue forward_reply (void *cls, const struct GNUNET_HashCode *query_hash, void *value)
 Iterator over hash map entries that send a given reply to each of the matching clients. More...
 
bool GDS_CLIENTS_handle_reply (const struct GNUNET_DATACACHE_Block *bd, const struct GNUNET_HashCode *query_hash, unsigned int get_path_length, const struct GNUNET_DHT_PathElement *get_path)
 Handle a reply we've received from another peer. More...
 
static void handle_dht_local_hello_get (void *cls, const struct GNUNET_MessageHeader *msg)
 Handler for HELLO GET message. More...
 
static enum GNUNET_GenericReturnValue check_dht_local_hello_offer (void *cls, const struct GNUNET_MessageHeader *hdr)
 Process a client HELLO message received from the service. More...
 
static void handle_dht_local_hello_offer (void *cls, const struct GNUNET_MessageHeader *msg)
 Handler for HELLO OFFER message. More...
 
static void handle_dht_local_monitor (void *cls, const struct GNUNET_DHT_MonitorStartStopMessage *msg)
 Handler for monitor start messages. More...
 
static void handle_dht_local_monitor_stop (void *cls, const struct GNUNET_DHT_MonitorStartStopMessage *msg)
 Handler for monitor stop messages. More...
 
static void for_matching_monitors (enum GNUNET_BLOCK_Type type, const struct GNUNET_HashCode *key, MonitorAction cb, void *cb_cls)
 Call cb on all monitors that watch for blocks of type and key key. More...
 
static void get_action (void *cls, struct ClientMonitorRecord *m)
 Function called on monitors that match a GET. More...
 
void GDS_CLIENTS_process_get (enum GNUNET_DHT_RouteOption options, enum GNUNET_BLOCK_Type type, uint32_t hop_count, uint32_t desired_replication_level, const struct GNUNET_HashCode *key)
 Check if some client is monitoring GET messages and notify them in that case. More...
 
static void response_action (void *cls, struct ClientMonitorRecord *m)
 Function called on monitors that match a response. More...
 
void GDS_CLIENTS_process_get_resp (const struct GNUNET_DATACACHE_Block *bd, const struct GNUNET_DHT_PathElement *get_path, unsigned int get_path_length)
 Check if some client is monitoring GET RESP messages and notify them in that case. More...
 
static void put_action (void *cls, struct ClientMonitorRecord *m)
 Function called on monitors that match a PUT. More...
 
void GDS_CLIENTS_process_put (const struct GNUNET_DATACACHE_Block *bd, uint32_t hop_count, uint32_t desired_replication_level)
 Check if some client is monitoring PUT messages and notify them in that case. More...
 
void GDS_CLIENTS_init (void)
 Initialize client subsystem. More...
 
void GDS_CLIENTS_stop (void)
 Shutdown client subsystem. More...
 
void GDS_CLIENTS_done (void)
 
void __attribute__ ((destructor))
 MINIMIZE heap size (way below 128k) since this process doesn't need much. More...
 

Variables

struct GNUNET_BLOCK_ContextGDS_block_context
 Our handle to the BLOCK library. More...
 
struct GNUNET_STATISTICS_HandleGDS_stats
 Handle for the statistics service. More...
 
struct GNUNET_SERVICE_HandleGDS_service
 Handle for the service. More...
 
const struct GNUNET_CONFIGURATION_HandleGDS_cfg
 The configuration the DHT service is running with. More...
 
static struct ClientMonitorRecordmonitor_head
 List of active monitoring requests. More...
 
static struct ClientMonitorRecordmonitor_tail
 List of active monitoring requests. More...
 
static struct GNUNET_CONTAINER_MultiHashMapforward_map
 Hashmap for fast key based lookup, maps keys to struct ClientQueryRecord entries. More...
 
static struct GNUNET_CONTAINER_Heapretry_heap
 Heap with all of our client's request, sorted by retry time (earliest on top). More...
 
static struct GNUNET_SCHEDULER_Taskretry_task
 Task that re-transmits requests (using retry_heap). More...
 

Detailed Description

GNUnet DHT service's client management code.

Author
Christian Grothoff
Nathan Evans

Definition in file gnunet-service-dht_clients.c.

Macro Definition Documentation

◆ SANITY_CHECKS

#define SANITY_CHECKS   0

Enable slow sanity checks to debug issues.

0: do not check 1: check all external inputs 2: check internal computations as well

Definition at line 35 of file gnunet-service-dht_clients.c.

◆ LOG_TRAFFIC

#define LOG_TRAFFIC (   kind,
  ... 
)
Value:
GNUNET_log_from (kind, "dht-traffic", \
__VA_ARGS__)
#define GNUNET_log_from(kind, comp,...)

Should routing details be logged to stderr (for debugging)?

Definition at line 40 of file gnunet-service-dht_clients.c.

◆ LOG

#define LOG (   kind,
  ... 
)    GNUNET_log_from (kind, "dht-clients", __VA_ARGS__)

Definition at line 43 of file gnunet-service-dht_clients.c.

◆ GDS_DHT_SERVICE_INIT

#define GDS_DHT_SERVICE_INIT (   name,
  run 
)

Define "main" method using service macro.

Parameters
namename of the service, like "dht" or "xdht"
runname of the initialization method for the service

Definition at line 1632 of file gnunet-service-dht_clients.c.

Typedef Documentation

◆ MonitorAction

typedef void(* MonitorAction) (void *cls, struct ClientMonitorRecord *m)

Function to call by for_matching_monitors().

Parameters
clsclosure
ma matching monitor

Definition at line 1298 of file gnunet-service-dht_clients.c.

Function Documentation

◆ remove_client_query_record()

static void remove_client_query_record ( struct ClientQueryRecord record)
static

Free data structures associated with the given query.

Parameters
recordrecord to remove

Definition at line 266 of file gnunet-service-dht_clients.c.

267{
268 struct ClientHandle *ch = record->ch;
269
271 ch->cqr_tail,
272 record);
275 &record->key,
276 record));
277 if (NULL != record->hnode)
279 GNUNET_array_grow (record->seen_replies,
280 record->seen_replies_count,
281 0);
283}
static struct GNUNET_CADET_Channel * ch
Channel handle.
Definition: gnunet-cadet.c:117
static void record(void *cls, size_t data_size, const void *data)
Process recorded audio data.
static struct GNUNET_CONTAINER_MultiHashMap * forward_map
Hashmap for fast key based lookup, maps keys to struct ClientQueryRecord entries.
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multihashmap_remove(struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key, const void *value)
Remove the given key-value pair from the map.
void * GNUNET_CONTAINER_heap_remove_node(struct GNUNET_CONTAINER_HeapNode *node)
Removes a node from the heap.
@ GNUNET_YES
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_array_grow(arr, size, tsize)
Grow a well-typed (!) array.
#define GNUNET_free(ptr)
Wrapper around free.
Struct containing information about a client, handle to connect to it, and any pending messages that ...

References ch, forward_map, GNUNET_array_grow, GNUNET_assert, GNUNET_CONTAINER_DLL_remove, GNUNET_CONTAINER_heap_remove_node(), GNUNET_CONTAINER_multihashmap_remove(), GNUNET_free, GNUNET_YES, and record().

Referenced by client_disconnect_cb(), forward_reply(), and remove_by_unique_id().

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◆ client_connect_cb()

static void * client_connect_cb ( void *  cls,
struct GNUNET_SERVICE_Client client,
struct GNUNET_MQ_Handle mq 
)
static

Functions with this signature are called whenever a local client is connects to us.

Parameters
clsclosure (NULL for dht)
clientidentification of the client
mqmessage queue for talking to client
Returns
our struct ClientHandle for client

Definition at line 296 of file gnunet-service-dht_clients.c.

299{
300 struct ClientHandle *ch;
301
302 (void) cls;
303 ch = GNUNET_new (struct ClientHandle);
304 ch->client = client;
305 ch->mq = mq;
306 return ch;
307}
struct GNUNET_MQ_Handle * mq
Definition: 003.c:5
#define GNUNET_new(type)
Allocate a struct or union of the given type.
struct GNUNET_SERVICE_Client * client
The handle to this client.
struct GNUNET_MQ_Handle * mq
Message Queue for the channel (which we are implementing).
Definition: cadet.h:142

References ch, ClientHandle::client, GNUNET_new, mq, and GNUNET_CADET_Channel::mq.

◆ client_disconnect_cb()

static void client_disconnect_cb ( void *  cls,
struct GNUNET_SERVICE_Client client,
void *  app_ctx 
)
static

Functions with this signature are called whenever a client is disconnected on the network level.

Parameters
clsclosure (NULL for dht)
clientidentification of the client
app_ctxour struct ClientHandle for client

Definition at line 319 of file gnunet-service-dht_clients.c.

322{
323 struct ClientHandle *ch = app_ctx;
324
325 (void) cls;
326 (void) client;
328 "Local client %p disconnects\n",
329 ch);
330 {
332
334 NULL != monitor;
335 monitor = next)
336 {
337 next = monitor->next;
338 if (monitor->ch != ch)
339 continue;
342 monitor);
344 }
345 }
346
347 {
348 struct ClientQueryRecord *cqr;
349
350 while (NULL != (cqr = ch->cqr_head))
352 }
353 GNUNET_free (ch);
354}
static int monitor
Monitor ARM activity.
Definition: gnunet-arm.c:63
static struct ClientMonitorRecord * monitor_head
List of active monitoring requests.
static struct ClientMonitorRecord * monitor_tail
List of active monitoring requests.
static void remove_client_query_record(struct ClientQueryRecord *record)
Free data structures associated with the given query.
#define GNUNET_log(kind,...)
@ GNUNET_ERROR_TYPE_DEBUG
Struct containing parameters of monitoring requests.
struct ClientMonitorRecord * next
Next element in DLL.
Entry in the local forwarding map for a client's GET request.

References ch, ClientHandle::client, GNUNET_CONTAINER_DLL_remove, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_log, monitor, monitor_head, monitor_tail, ClientMonitorRecord::next, and remove_client_query_record().

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◆ transmit_request()

static void transmit_request ( struct ClientQueryRecord cqr)
static

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.

Parameters
cqrrequest to transmit

Definition at line 365 of file gnunet-service-dht_clients.c.

366{
367 struct GNUNET_BLOCK_Group *bg;
368 struct GNUNET_CONTAINER_BloomFilter *peer_bf;
369
371 "# GET requests from clients injected",
372 1,
373 GNUNET_NO);
375 cqr->type,
376 NULL, /* raw data */
377 0, /* raw data size */
378 "seen-set-size",
380 NULL);
382 cqr->seen_replies,
383 cqr->seen_replies_count);
384 peer_bf
389 "Initiating GET for %s, replication %u, already have %u replies\n",
390 GNUNET_h2s (&cqr->key),
391 cqr->replication,
392 cqr->seen_replies_count);
394 cqr->msg_options,
395 cqr->replication,
396 0 /* hop count */,
397 &cqr->key,
398 cqr->xquery,
399 cqr->xquery_size,
400 bg,
401 peer_bf);
404
405 /* Exponential back-off for retries.
406 * max. is #GNUNET_TIME_STD_EXPONENTIAL_BACKOFF_THRESHOLD (15 min) */
409}
#define DHT_BLOOM_SIZE
Size of the bloom filter the DHT uses to filter peers.
Definition: dht.h:34
struct GNUNET_STATISTICS_Handle * GDS_stats
Handle for the statistics service.
struct GNUNET_BLOCK_Context * GDS_block_context
Our handle to the BLOCK library.
#define LOG(kind,...)
enum GNUNET_GenericReturnValue GDS_NEIGHBOURS_handle_get(enum GNUNET_BLOCK_Type type, enum GNUNET_DHT_RouteOption options, uint16_t desired_replication_level, uint16_t hop_count, const struct GNUNET_HashCode *key, const void *xquery, size_t xquery_size, struct GNUNET_BLOCK_Group *bg, struct GNUNET_CONTAINER_BloomFilter *peer_bf)
Perform a GET operation.
enum GNUNET_GenericReturnValue GNUNET_BLOCK_group_set_seen(struct GNUNET_BLOCK_Group *bg, const struct GNUNET_HashCode *seen_results, unsigned int seen_results_count)
Update block group to filter out the given results.
Definition: block.c:363
void GNUNET_BLOCK_group_destroy(struct GNUNET_BLOCK_Group *bg)
Destroy resources used by a block group.
Definition: block.c:192
struct GNUNET_BLOCK_Group * GNUNET_BLOCK_group_create(struct GNUNET_BLOCK_Context *ctx, enum GNUNET_BLOCK_Type type, const void *raw_data, size_t raw_data_size,...)
Create a new block group.
Definition: block.c:247
struct GNUNET_CONTAINER_BloomFilter * GNUNET_CONTAINER_bloomfilter_init(const char *data, size_t size, unsigned int k)
Create a Bloom filter from raw bits.
void GNUNET_CONTAINER_bloomfilter_free(struct GNUNET_CONTAINER_BloomFilter *bf)
Free the space associated with a filter in memory, flush to drive if needed (do not free the space on...
#define GNUNET_CONSTANTS_BLOOMFILTER_K
K-value that must be used for the bloom filters in 'GET' queries.
@ GNUNET_NO
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
void GNUNET_STATISTICS_update(struct GNUNET_STATISTICS_Handle *handle, const char *name, int64_t delta, int make_persistent)
Set statistic value for the peer.
struct GNUNET_TIME_Absolute GNUNET_TIME_relative_to_absolute(struct GNUNET_TIME_Relative rel)
Convert relative time to an absolute time in the future.
Definition: time.c:316
#define GNUNET_TIME_STD_BACKOFF(r)
Perform our standard exponential back-off calculation, starting at 1 ms and then going by a factor of...
unsigned int seen_replies_count
Number of entries in seen_replies.
size_t xquery_size
Number of bytes in xquery.
struct GNUNET_TIME_Relative retry_frequency
What's the delay between re-try operations that we currently use for this request?
struct GNUNET_HashCode * seen_replies
Array of (hashes of) replies we have already seen for this request.
enum GNUNET_DHT_RouteOption msg_options
Any message options for this request.
struct GNUNET_HashCode key
The key this request was about.
enum GNUNET_BLOCK_Type type
The type for the data for the GET request.
const void * xquery
Extended query (see gnunet_block_lib.h), allocated at the end of this struct.
struct GNUNET_TIME_Absolute retry_time
What's the next time we should re-try this request?
uint32_t replication
Desired replication level.
Block group data.

References DHT_BLOOM_SIZE, GDS_block_context, GDS_NEIGHBOURS_handle_get(), GDS_stats, GNUNET_BLOCK_group_create(), GNUNET_BLOCK_group_destroy(), GNUNET_BLOCK_group_set_seen(), GNUNET_CONSTANTS_BLOOMFILTER_K, GNUNET_CONTAINER_bloomfilter_free(), GNUNET_CONTAINER_bloomfilter_init(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_NO, GNUNET_STATISTICS_update(), GNUNET_TIME_relative_to_absolute(), GNUNET_TIME_STD_BACKOFF, ClientQueryRecord::key, LOG, ClientQueryRecord::msg_options, ClientQueryRecord::replication, ClientQueryRecord::retry_frequency, ClientQueryRecord::retry_time, ClientQueryRecord::seen_replies, ClientQueryRecord::seen_replies_count, ClientQueryRecord::type, ClientQueryRecord::xquery, and ClientQueryRecord::xquery_size.

Referenced by transmit_next_request_task().

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◆ transmit_next_request_task()

static void transmit_next_request_task ( void *  cls)
static

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).

Parameters
clsunused

Definition at line 420 of file gnunet-service-dht_clients.c.

421{
422 struct ClientQueryRecord *cqr;
423
424 (void) cls;
425 retry_task = NULL;
426 while (NULL != (cqr = GNUNET_CONTAINER_heap_remove_root (retry_heap)))
427 {
428 cqr->hnode = NULL;
430 {
431 cqr->hnode
433 cqr,
438 NULL);
439 return;
440 }
441 transmit_request (cqr);
442 cqr->hnode
444 cqr,
446 }
447}
static void transmit_request(struct ClientQueryRecord *cqr)
Route the given request via the DHT.
static struct GNUNET_CONTAINER_Heap * retry_heap
Heap with all of our client's request, sorted by retry time (earliest on top).
static struct GNUNET_SCHEDULER_Task * retry_task
Task that re-transmits requests (using retry_heap).
static void transmit_next_request_task(void *cls)
Task that looks at the retry_heap and transmits all of the requests on the heap that are ready for tr...
void * GNUNET_CONTAINER_heap_remove_root(struct GNUNET_CONTAINER_Heap *heap)
Remove root of the heap.
struct GNUNET_CONTAINER_HeapNode * GNUNET_CONTAINER_heap_insert(struct GNUNET_CONTAINER_Heap *heap, void *element, GNUNET_CONTAINER_HeapCostType cost)
Inserts a new element into the heap.
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_at(struct GNUNET_TIME_Absolute at, GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run at the specified time.
Definition: scheduler.c:1253
bool GNUNET_TIME_absolute_is_past(struct GNUNET_TIME_Absolute abs)
Test if abs is truly in the past (excluding now).
Definition: time.c:671
struct GNUNET_CONTAINER_HeapNode * hnode
Pointer to this nodes heap location in the retry-heap (for fast removal)
uint64_t abs_value_us
The actual value.

References GNUNET_TIME_Absolute::abs_value_us, GNUNET_CONTAINER_heap_insert(), GNUNET_CONTAINER_heap_remove_root(), GNUNET_SCHEDULER_add_at(), GNUNET_TIME_absolute_is_past(), ClientQueryRecord::hnode, retry_heap, retry_task, ClientQueryRecord::retry_time, transmit_next_request_task(), and transmit_request().

Referenced by handle_dht_local_get(), and transmit_next_request_task().

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◆ check_dht_local_put()

static enum GNUNET_GenericReturnValue check_dht_local_put ( void *  cls,
const struct GNUNET_DHT_ClientPutMessage dht_msg 
)
static

Check DHT PUT messages from the client.

Parameters
clsthe client we received this message from
dht_msgthe actual message received
Returns
GNUNET_OK (always)

Definition at line 458 of file gnunet-service-dht_clients.c.

460{
461 uint32_t replication_level = ntohl (dht_msg->desired_replication_level);
462
463 (void) cls;
465 {
466 GNUNET_break_op (0);
467 return GNUNET_SYSERR;
468 }
469 return GNUNET_OK;
470}
static unsigned int replication_level
Replication level option to use for publishing.
#define GNUNET_DHT_MAXIMUM_REPLICATION_LEVEL
Maximum allowed replication level for all requests.
@ GNUNET_OK
@ GNUNET_SYSERR
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
uint32_t desired_replication_level
Replication level for this message.
Definition: dht.h:219

References GNUNET_DHT_ClientPutMessage::desired_replication_level, GNUNET_break_op, GNUNET_DHT_MAXIMUM_REPLICATION_LEVEL, GNUNET_OK, GNUNET_SYSERR, and replication_level.

◆ handle_dht_local_put()

static void handle_dht_local_put ( void *  cls,
const struct GNUNET_DHT_ClientPutMessage dht_msg 
)
static

Handler for PUT messages.

Parameters
clsthe client we received this message from
dht_msgthe actual message received

Definition at line 480 of file gnunet-service-dht_clients.c.

482{
483 struct ClientHandle *ch = cls;
484 uint16_t size = ntohs (dht_msg->header.size);
485 uint32_t replication_level
486 = ntohl (dht_msg->desired_replication_level);
487 struct GNUNET_DATACACHE_Block bd = {
488 .key = dht_msg->key,
489 .expiration_time = GNUNET_TIME_absolute_ntoh (dht_msg->expiration),
490 .data = &dht_msg[1],
491 .data_size = size - sizeof (*dht_msg),
492 .type = ntohl (dht_msg->type),
493 .ro = ntohl (dht_msg->options)
494 };
495
497 "Handling local PUT of %lu-bytes for query %s of type %u\n",
498 (unsigned long) (size - sizeof(struct GNUNET_DHT_ClientPutMessage)),
499 GNUNET_h2s (&dht_msg->key),
500 (unsigned int) bd.type);
501#if SANITY_CHECKS > 0
502 if (GNUNET_OK !=
504 bd.type,
505 bd.data,
506 bd.data_size))
507 {
508 GNUNET_break (0);
509 return;
510 }
511#endif
513 "# PUT requests received from clients",
514 1,
515 GNUNET_NO);
517 "CLIENT-PUT %s\n",
518 GNUNET_h2s_full (&dht_msg->key));
519 /* give to local clients */
521 &bd.key,
522 0, NULL /* get path */));
523
524 {
525 struct GNUNET_CONTAINER_BloomFilter *peer_bf;
526
527 peer_bf
531 /* store locally */
532 if ( (0 != (bd.ro & GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE)) ||
533 (GDS_am_closest_peer (&dht_msg->key,
534 peer_bf)))
536 /* route to other peers */
537 if (GNUNET_OK !=
540 0 /* hop count */,
541 peer_bf))
542 {
544 "# Local PUT requests not routed",
545 1,
546 GNUNET_NO);
547 }
549 }
551 &bd,
552 0, /* hop count */
555}
void GDS_CLIENTS_process_put(const struct GNUNET_DATACACHE_Block *bd, uint32_t hop_count, uint32_t desired_replication_level)
Check if some client is monitoring PUT messages and notify them in that case.
bool GDS_CLIENTS_handle_reply(const struct GNUNET_DATACACHE_Block *bd, const struct GNUNET_HashCode *query_hash, unsigned int get_path_length, const struct GNUNET_DHT_PathElement *get_path)
Handle a reply we've received from another peer.
#define LOG_TRAFFIC(kind,...)
Should routing details be logged to stderr (for debugging)?
void GDS_DATACACHE_handle_put(const struct GNUNET_DATACACHE_Block *bd)
Handle a datum we've received from another peer.
enum GNUNET_GenericReturnValue GDS_NEIGHBOURS_handle_put(const struct GNUNET_DATACACHE_Block *bd, uint16_t desired_replication_level, uint16_t hop_count, struct GNUNET_CONTAINER_BloomFilter *bf)
Perform a PUT operation.
enum GNUNET_GenericReturnValue GDS_am_closest_peer(const struct GNUNET_HashCode *key, const struct GNUNET_CONTAINER_BloomFilter *bloom)
Check whether my identity is closer than any known peers.
enum GNUNET_GenericReturnValue GNUNET_BLOCK_check_block(struct GNUNET_BLOCK_Context *ctx, enum GNUNET_BLOCK_Type type, const void *block, size_t block_size)
Function called to validate a block.
Definition: block.c:319
@ GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE
Each peer along the way should process the request (otherwise only peers locally closest to the key w...
uint16_t size
The length of the struct (in bytes, including the length field itself), in big-endian format.
const char * GNUNET_h2s_full(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
void GNUNET_SERVICE_client_continue(struct GNUNET_SERVICE_Client *c)
Continue receiving further messages from the given client.
Definition: service.c:2348
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_ntoh(struct GNUNET_TIME_AbsoluteNBO a)
Convert absolute time from network byte order.
Definition: time.c:739
static unsigned int size
Size of the "table".
Definition: peer.c:68
Information about a block stored in the datacache.
enum GNUNET_BLOCK_Type type
Type of the block.
const void * data
Actual block data.
enum GNUNET_DHT_RouteOption ro
Options for routing for the block.
struct GNUNET_HashCode key
Key of the block.
size_t data_size
Number of bytes in data.
Message to insert data into the DHT, sent from clients to DHT service.
Definition: dht.h:200
struct GNUNET_HashCode key
The key to store the value under.
Definition: dht.h:229
uint32_t type
The type of data to insert.
Definition: dht.h:209
uint32_t options
Message options, actually an 'enum GNUNET_DHT_RouteOption' value.
Definition: dht.h:214
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT.
Definition: dht.h:204
struct GNUNET_TIME_AbsoluteNBO expiration
How long should this data persist?
Definition: dht.h:224

References ch, GNUNET_DATACACHE_Block::data, GNUNET_DATACACHE_Block::data_size, GNUNET_DHT_ClientPutMessage::desired_replication_level, DHT_BLOOM_SIZE, GNUNET_DHT_ClientPutMessage::expiration, GDS_am_closest_peer(), GDS_block_context, GDS_CLIENTS_handle_reply(), GDS_CLIENTS_process_put(), GDS_DATACACHE_handle_put(), GDS_NEIGHBOURS_handle_put(), GDS_stats, GNUNET_BLOCK_check_block(), GNUNET_break, GNUNET_CONSTANTS_BLOOMFILTER_K, GNUNET_CONTAINER_bloomfilter_free(), GNUNET_CONTAINER_bloomfilter_init(), GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_h2s_full(), GNUNET_NO, GNUNET_OK, GNUNET_SERVICE_client_continue(), GNUNET_STATISTICS_update(), GNUNET_TIME_absolute_ntoh(), GNUNET_DHT_ClientPutMessage::header, GNUNET_DATACACHE_Block::key, GNUNET_DHT_ClientPutMessage::key, LOG, LOG_TRAFFIC, GNUNET_DHT_ClientPutMessage::options, replication_level, GNUNET_DATACACHE_Block::ro, GNUNET_MessageHeader::size, size, GNUNET_DATACACHE_Block::type, and GNUNET_DHT_ClientPutMessage::type.

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◆ handle_local_result()

static void handle_local_result ( void *  cls,
const struct GNUNET_DATACACHE_Block bd 
)
static

Handle a result from local datacache for a GET operation.

Parameters
clsthe struct ClientHandle of the client doing the query
bddetails about the block that was found

Definition at line 565 of file gnunet-service-dht_clients.c.

567{
569 "Datacache provided result for query key %s\n",
570 GNUNET_h2s (&bd->key));
572 &bd->key,
573 0, NULL /* get_path */));
574}
@ GNUNET_ERROR_TYPE_INFO

References GDS_CLIENTS_handle_reply(), GNUNET_break, GNUNET_ERROR_TYPE_INFO, GNUNET_h2s(), GNUNET_log, and GNUNET_DATACACHE_Block::key.

Referenced by handle_dht_local_get().

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◆ check_dht_local_get()

static enum GNUNET_GenericReturnValue check_dht_local_get ( void *  cls,
const struct GNUNET_DHT_ClientGetMessage get 
)
static

Check DHT GET messages from the client.

Parameters
clsthe client we received this message from
getthe actual message received
Returns
GNUNET_OK (always)

Definition at line 585 of file gnunet-service-dht_clients.c.

587{
588 (void) cls;
589 (void) get;
590 /* always well-formed */
591 return GNUNET_OK;
592}
static int get
Get DID Documement for DID Flag.
Definition: gnunet-did.c:62

References get, and GNUNET_OK.

◆ handle_dht_local_get()

static void handle_dht_local_get ( void *  cls,
const struct GNUNET_DHT_ClientGetMessage get 
)
static

Handler for DHT GET messages from the client.

Parameters
clsthe client we received this message from
getthe actual message received

Definition at line 602 of file gnunet-service-dht_clients.c.

604{
605 struct ClientHandle *ch = cls;
606 struct ClientQueryRecord *cqr;
607 uint16_t size = ntohs (get->header.size);
608 const char *xquery = (const char *) &get[1];
609 size_t xquery_size = size - sizeof(struct GNUNET_DHT_ClientGetMessage);
610
612 "Received GET request for %s from local client %p, xq: %.*s\n",
613 GNUNET_h2s (&get->key),
614 ch->client,
615 (int) xquery_size,
616 xquery);
618 "# GET requests received from clients",
619 1,
620 GNUNET_NO);
622 "CLIENT-GET %s\n",
623 GNUNET_h2s_full (&get->key));
624
625 cqr = GNUNET_malloc (sizeof(struct ClientQueryRecord) + xquery_size);
626 cqr->key = get->key;
627 cqr->ch = ch;
628 cqr->xquery = (const void *) &cqr[1];
629 GNUNET_memcpy (&cqr[1],
630 xquery,
631 xquery_size);
633 cqr,
634 0);
637 cqr->unique_id = get->unique_id;
638 cqr->xquery_size = xquery_size;
639 cqr->replication = ntohl (get->desired_replication_level);
640 cqr->msg_options = ntohl (get->options);
641 cqr->type = ntohl (get->type);
643 ch->cqr_tail,
644 cqr);
646 &cqr->key,
647 cqr,
650 cqr->type,
651 0, /* hop count */
652 cqr->replication,
653 &get->key);
654 /* start remote requests */
655 if (NULL != retry_task)
658 NULL);
659 /* perform local lookup */
661 cqr->type,
662 cqr->xquery,
663 xquery_size,
664 NULL,
666 ch);
668}
void GDS_CLIENTS_process_get(enum GNUNET_DHT_RouteOption options, enum GNUNET_BLOCK_Type type, uint32_t hop_count, uint32_t desired_replication_level, const struct GNUNET_HashCode *key)
Check if some client is monitoring GET messages and notify them in that case.
static void handle_local_result(void *cls, const struct GNUNET_DATACACHE_Block *bd)
Handle a result from local datacache for a GET operation.
enum GNUNET_BLOCK_ReplyEvaluationResult GDS_DATACACHE_handle_get(const struct GNUNET_HashCode *key, enum GNUNET_BLOCK_Type type, const void *xquery, size_t xquery_size, struct GNUNET_BLOCK_Group *bg, GDS_DATACACHE_GetCallback gc, void *gc_cls)
Handle a GET request we've received from another peer.
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multihashmap_put(struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key, void *value, enum GNUNET_CONTAINER_MultiHashMapOption opt)
Store a key-value pair in the map.
@ GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE
Allow multiple values with the same key.
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
#define GNUNET_malloc(size)
Wrapper around malloc.
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:979
struct GNUNET_SCHEDULER_Task * GNUNET_SCHEDULER_add_now(GNUNET_SCHEDULER_TaskCallback task, void *task_cls)
Schedule a new task to be run as soon as possible.
Definition: scheduler.c:1303
#define GNUNET_TIME_UNIT_SECONDS
One second.
struct GNUNET_TIME_Absolute GNUNET_TIME_absolute_get(void)
Get the current time.
Definition: time.c:111
struct ClientHandle * ch
Client responsible for the request.
uint64_t unique_id
The unique identifier of this request.
DHT GET message sent from clients to service.
Definition: dht.h:72

References ch, ClientQueryRecord::ch, forward_map, GDS_CLIENTS_process_get(), GDS_DATACACHE_handle_get(), GDS_stats, get, GNUNET_CONTAINER_DLL_insert, GNUNET_CONTAINER_heap_insert(), GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_h2s_full(), GNUNET_malloc, GNUNET_memcpy, GNUNET_NO, GNUNET_SCHEDULER_add_now(), GNUNET_SCHEDULER_cancel(), GNUNET_SERVICE_client_continue(), GNUNET_STATISTICS_update(), GNUNET_TIME_absolute_get(), GNUNET_TIME_UNIT_SECONDS, handle_local_result(), ClientQueryRecord::hnode, ClientQueryRecord::key, LOG, LOG_TRAFFIC, ClientQueryRecord::msg_options, ClientQueryRecord::replication, ClientQueryRecord::retry_frequency, retry_heap, retry_task, ClientQueryRecord::retry_time, size, transmit_next_request_task(), ClientQueryRecord::type, ClientQueryRecord::unique_id, ClientQueryRecord::xquery, and ClientQueryRecord::xquery_size.

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◆ find_by_unique_id()

static enum GNUNET_GenericReturnValue find_by_unique_id ( void *  cls,
const struct GNUNET_HashCode key,
void *  value 
)
static

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.

Parameters
clsthe search context
keyquery for the lookup (not used)
valuethe struct ClientQueryRecord
Returns
GNUNET_YES to continue iteration (result not yet found)

Definition at line 699 of file gnunet-service-dht_clients.c.

702{
703 struct FindByUniqueIdContext *fui_ctx = cls;
704 struct ClientQueryRecord *cqr = value;
705
706 if (cqr->unique_id != fui_ctx->unique_id)
707 return GNUNET_YES;
708 fui_ctx->cqr = cqr;
709 return GNUNET_NO;
710}
static char * value
Value of the record to add/remove.
Closure for find_by_unique_id().
uint64_t unique_id
Unique ID to look for.
struct ClientQueryRecord * cqr
Where to store the result, if found.

References FindByUniqueIdContext::cqr, GNUNET_NO, GNUNET_YES, ClientQueryRecord::unique_id, FindByUniqueIdContext::unique_id, and value.

Referenced by handle_dht_local_get_result_seen().

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◆ check_dht_local_get_result_seen()

static enum GNUNET_GenericReturnValue check_dht_local_get_result_seen ( void *  cls,
const struct GNUNET_DHT_ClientGetResultSeenMessage seen 
)
static

Check "GET result seen" messages from the client.

Parameters
clsthe client we received this message from
seenthe actual message received
Returns
GNUNET_OK if seen is well-formed

Definition at line 721 of file gnunet-service-dht_clients.c.

724{
725 uint16_t size = ntohs (seen->header.size);
726 unsigned int hash_count =
727 (size - sizeof(*seen))
728 / sizeof(struct GNUNET_HashCode);
729
730 if (size != sizeof(*seen) + hash_count * sizeof(struct GNUNET_HashCode))
731 {
732 GNUNET_break (0);
733 return GNUNET_SYSERR;
734 }
735 return GNUNET_OK;
736}
struct GNUNET_MessageHeader header
Type: GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_RESULTS_KNOWN.
Definition: dht.h:118
A 512-bit hashcode.

References GNUNET_break, GNUNET_OK, GNUNET_SYSERR, GNUNET_DHT_ClientGetResultSeenMessage::header, GNUNET_MessageHeader::size, and size.

◆ handle_dht_local_get_result_seen()

static void handle_dht_local_get_result_seen ( void *  cls,
const struct GNUNET_DHT_ClientGetResultSeenMessage seen 
)
static

Handler for "GET result seen" messages from the client.

Parameters
clsthe client we received this message from
seenthe actual message received

Definition at line 746 of file gnunet-service-dht_clients.c.

749{
750 struct ClientHandle *ch = cls;
751 uint16_t size = ntohs (seen->header.size);
752 unsigned int hash_count = (size - sizeof(*seen))
753 / sizeof(struct GNUNET_HashCode);
754 const struct GNUNET_HashCode *hc = (const struct GNUNET_HashCode*) &seen[1];
755 struct FindByUniqueIdContext fui_ctx = {
756 .unique_id = seen->unique_id
757 };
758 unsigned int old_count;
759 struct ClientQueryRecord *cqr;
760
762 &seen->key,
764 &fui_ctx);
765 if (NULL == (cqr = fui_ctx.cqr))
766 {
767 GNUNET_break (0);
769 return;
770 }
771 /* finally, update 'seen' list */
772 old_count = cqr->seen_replies_count;
775 cqr->seen_replies_count + hash_count);
776 GNUNET_memcpy (&cqr->seen_replies[old_count],
777 hc,
778 sizeof(struct GNUNET_HashCode) * hash_count);
779}
static enum GNUNET_GenericReturnValue find_by_unique_id(void *cls, const struct GNUNET_HashCode *key, void *value)
Function called for each existing DHT record for the given query.
enum GNUNET_GenericReturnValue GNUNET_CONTAINER_multihashmap_get_multiple(struct GNUNET_CONTAINER_MultiHashMap *map, const struct GNUNET_HashCode *key, GNUNET_CONTAINER_MultiHashMapIteratorCallback it, void *it_cls)
Iterate over all entries in the map that match a particular key.
void GNUNET_SERVICE_client_drop(struct GNUNET_SERVICE_Client *c)
Ask the server to disconnect from the given client.
Definition: service.c:2377
struct GNUNET_HashCode key
The key we are searching for (to make it easy to find the corresponding GET inside the service).
Definition: dht.h:129
uint64_t unique_id
Unique ID identifying this request.
Definition: dht.h:134

References ch, FindByUniqueIdContext::cqr, find_by_unique_id(), forward_map, GNUNET_array_grow, GNUNET_break, GNUNET_CONTAINER_multihashmap_get_multiple(), GNUNET_memcpy, GNUNET_SERVICE_client_drop(), GNUNET_DHT_ClientGetResultSeenMessage::header, GNUNET_DHT_ClientGetResultSeenMessage::key, ClientQueryRecord::seen_replies, ClientQueryRecord::seen_replies_count, GNUNET_MessageHeader::size, size, GNUNET_DHT_ClientGetResultSeenMessage::unique_id, and FindByUniqueIdContext::unique_id.

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◆ remove_by_unique_id()

static enum GNUNET_GenericReturnValue remove_by_unique_id ( void *  cls,
const struct GNUNET_HashCode key,
void *  value 
)
static

Iterator over hash map entries that frees all entries that match the given client and unique ID.

Parameters
clsunique ID and client to search for in source routes
keycurrent key code
valuevalue in the hash map, a ClientQueryRecord
Returns
GNUNET_YES (we should continue to iterate)

Definition at line 809 of file gnunet-service-dht_clients.c.

812{
813 const struct RemoveByUniqueIdContext *ctx = cls;
814 struct ClientQueryRecord *cqr = value;
815
816 if (cqr->unique_id != ctx->unique_id)
817 return GNUNET_YES;
819 "Removing client %p's record for key %s (by unique id)\n",
820 ctx->ch->client,
821 GNUNET_h2s (key));
823 return GNUNET_YES;
824}
struct GNUNET_HashCode key
The key used in the DHT.
static struct GNUNET_FS_Handle * ctx
Closure for remove_by_unique_id().

References ctx, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_log, GNUNET_YES, key, remove_client_query_record(), ClientQueryRecord::unique_id, and value.

Referenced by handle_dht_local_get_stop().

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◆ handle_dht_local_get_stop()

static void handle_dht_local_get_stop ( void *  cls,
const struct GNUNET_DHT_ClientGetStopMessage dht_stop_msg 
)
static

Handler for any generic DHT stop messages, calls the appropriate handler depending on message type (if processed locally)

Parameters
clsclient we received this message from
dht_stop_msgthe actual message received

Definition at line 836 of file gnunet-service-dht_clients.c.

839{
840 struct ClientHandle *ch = cls;
842
844 "# GET STOP requests received from clients",
845 1,
846 GNUNET_NO);
848 "Received GET STOP request for %s from local client %p\n",
849 GNUNET_h2s (&dht_stop_msg->key),
850 ch->client);
851 ctx.ch = ch;
852 ctx.unique_id = dht_stop_msg->unique_id;
854 &dht_stop_msg->key,
856 &ctx);
858}
static enum GNUNET_GenericReturnValue remove_by_unique_id(void *cls, const struct GNUNET_HashCode *key, void *value)
Iterator over hash map entries that frees all entries that match the given client and unique ID.
uint64_t unique_id
Unique ID identifying this request.
Definition: dht.h:58
struct GNUNET_HashCode key
Key of this request.
Definition: dht.h:63

References ch, ctx, forward_map, GDS_stats, GNUNET_CONTAINER_multihashmap_get_multiple(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_NO, GNUNET_SERVICE_client_continue(), GNUNET_STATISTICS_update(), GNUNET_DHT_ClientGetStopMessage::key, LOG, remove_by_unique_id(), and GNUNET_DHT_ClientGetStopMessage::unique_id.

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◆ forward_reply()

static enum GNUNET_GenericReturnValue forward_reply ( void *  cls,
const struct GNUNET_HashCode query_hash,
void *  value 
)
static

Iterator over hash map entries that send a given reply to each of the matching clients.

With some tricky recycling of the buffer.

Parameters
clsthe struct ForwardReplyContext
query_hashhash of the query for which this may be a reply
valuevalue in the hash map, a ClientQueryRecord
Returns
GNUNET_YES (we should continue to iterate), if the result is mal-formed, GNUNET_NO

Definition at line 896 of file gnunet-service-dht_clients.c.

899{
900 struct ForwardReplyContext *frc = cls;
902 const struct GNUNET_DATACACHE_Block *bd = frc->bd;
903 struct GNUNET_MQ_Envelope *env;
904 struct GNUNET_DHT_ClientResultMessage *reply;
906 bool do_free;
907 struct GNUNET_HashCode ch;
908 struct GNUNET_DHT_PathElement *paths;
909 bool truncated = (0 != (bd->ro & GNUNET_DHT_RO_TRUNCATED));
910 size_t xsize = bd->data_size;
911
913 "CLIENT-RESULT %s\n",
914 GNUNET_h2s_full (&bd->key));
915 if ( (record->type != GNUNET_BLOCK_TYPE_ANY) &&
916 (record->type != bd->type) )
917 {
919 "Record type mismatch, not passing request for key %s to local client\n",
920 GNUNET_h2s (&bd->key));
922 "# Key match, type mismatches in REPLY to CLIENT",
923 1,
924 GNUNET_NO);
925 return GNUNET_YES; /* type mismatch */
926 }
927 if ( (0 == (record->msg_options & GNUNET_DHT_RO_FIND_APPROXIMATE)) &&
928 (0 != GNUNET_memcmp (&bd->key,
929 query_hash)) )
930 {
932 "# Inexact key match, but exact match required",
933 1,
934 GNUNET_NO);
935 return GNUNET_YES; /* type mismatch */
936 }
938 bd->data_size,
939 &ch);
940 for (unsigned int i = 0; i < record->seen_replies_count; i++)
941 if (0 ==
942 GNUNET_memcmp (&record->seen_replies[i],
943 &ch))
944 {
946 "Duplicate reply, not passing request for key %s to local client\n",
947 GNUNET_h2s (&bd->key));
949 "# Duplicate REPLIES to CLIENT request dropped",
950 1,
951 GNUNET_NO);
952 return GNUNET_YES; /* duplicate */
953 }
954 eval
956 record->type,
957 NULL,
958 &bd->key,
959 record->xquery,
960 record->xquery_size,
961 bd->data,
962 bd->data_size);
964 "Evaluation result is %d for key %s for local client's query\n",
965 (int) eval,
966 GNUNET_h2s (&bd->key));
967 switch (eval)
968 {
970 do_free = true;
971 break;
974 GNUNET_array_append (record->seen_replies,
975 record->seen_replies_count,
976 ch);
977 do_free = false;
978 break;
980 /* should be impossible to encounter here */
981 GNUNET_break (0);
982 return GNUNET_YES;
984 return GNUNET_YES;
985 default:
986 GNUNET_break (0);
987 return GNUNET_NO;
988 }
990 "# RESULTS queued for clients",
991 1,
992 GNUNET_NO);
993 xsize += (frc->get_path_length + bd->put_path_length)
994 * sizeof(struct GNUNET_DHT_PathElement);
995 if (truncated)
996 xsize += sizeof (struct GNUNET_PeerIdentity);
997
998#if SUPER_REDUNDANT_CHECK
999 GNUNET_break (0 ==
1001 bd->data_size,
1002 bd->expiration_time,
1003 truncated
1004 ? &bd->trunc_peer
1005 : NULL,
1006 bd->put_path,
1007 bd->put_path_length,
1008 frc->get_path,
1009 frc->get_path_length,
1010 &GDS_my_identity));
1011#endif
1012
1013 env = GNUNET_MQ_msg_extra (reply,
1014 xsize,
1016 reply->type = htonl (bd->type);
1017 reply->options = htonl (bd->ro);
1018 reply->get_path_length = htonl (frc->get_path_length);
1019 reply->put_path_length = htonl (bd->put_path_length);
1020 reply->unique_id = record->unique_id;
1022 reply->key = *query_hash;
1023 if (truncated)
1024 {
1025 void *tgt = &reply[1];
1026
1027 GNUNET_memcpy (tgt,
1028 &bd->trunc_peer,
1029 sizeof (struct GNUNET_PeerIdentity));
1030 paths = (struct GNUNET_DHT_PathElement *)
1031 (tgt + sizeof (struct GNUNET_PeerIdentity));
1032 }
1033 else
1034 {
1035 paths = (struct GNUNET_DHT_PathElement *) &reply[1];
1036 }
1037 GNUNET_memcpy (paths,
1038 bd->put_path,
1039 sizeof(struct GNUNET_DHT_PathElement)
1040 * bd->put_path_length);
1041 GNUNET_memcpy (&paths[bd->put_path_length],
1042 frc->get_path,
1043 sizeof(struct GNUNET_DHT_PathElement)
1044 * frc->get_path_length);
1045 GNUNET_memcpy (&paths[frc->get_path_length + bd->put_path_length],
1046 bd->data,
1047 bd->data_size);
1049 "Sending reply to query %s for client %p\n",
1050 GNUNET_h2s (query_hash),
1051 record->ch->client);
1052 GNUNET_MQ_send (record->ch->mq,
1053 env);
1054 if (GNUNET_YES == do_free)
1056 return GNUNET_YES;
1057}
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
struct GNUNET_PeerIdentity GDS_my_identity
Identity of this peer.
enum GNUNET_BLOCK_ReplyEvaluationResult GNUNET_BLOCK_check_reply(struct GNUNET_BLOCK_Context *ctx, enum GNUNET_BLOCK_Type type, struct GNUNET_BLOCK_Group *group, const struct GNUNET_HashCode *query, const void *xquery, size_t xquery_size, const void *reply_block, size_t reply_block_size)
Function called to validate if a reply is good for a particular query.
Definition: block.c:337
GNUNET_BLOCK_ReplyEvaluationResult
Possible ways for how a block may relate to a query.
@ GNUNET_BLOCK_REPLY_OK_MORE
Valid result, and there may be more.
@ GNUNET_BLOCK_REPLY_OK_DUPLICATE
Valid result, but suppressed because it is a duplicate.
@ GNUNET_BLOCK_REPLY_OK_LAST
Last possible valid result.
@ GNUNET_BLOCK_REPLY_TYPE_NOT_SUPPORTED
Specified block type not supported by any plugin.
@ GNUNET_BLOCK_REPLY_IRRELEVANT
Block does not match xquery (valid result, not relevant for the request)
unsigned int GNUNET_DHT_verify_path(const void *data, size_t data_size, struct GNUNET_TIME_Absolute exp_time, const struct GNUNET_PeerIdentity *trunc_peer, const struct GNUNET_DHT_PathElement *put_path, unsigned int put_path_len, const struct GNUNET_DHT_PathElement *get_path, unsigned int get_path_len, const struct GNUNET_PeerIdentity *me)
Verify signatures on a path consisting of put_path and get_path in reverse order (starting at the las...
Definition: dht_api.c:1344
@ GNUNET_DHT_RO_TRUNCATED
Flag set if the path was truncated.
@ GNUNET_DHT_RO_FIND_APPROXIMATE
Approximate results are fine.
void GNUNET_CRYPTO_hash(const void *block, size_t size, struct GNUNET_HashCode *ret)
Compute hash of a given block.
Definition: crypto_hash.c:41
#define GNUNET_memcmp(a, b)
Compare memory in a and b, where both must be of the same pointer type.
#define GNUNET_array_append(arr, len, element)
Append an element to an array (growing the array by one).
void GNUNET_MQ_send(struct GNUNET_MQ_Handle *mq, struct GNUNET_MQ_Envelope *ev)
Send a message with the given message queue.
Definition: mq.c:305
#define GNUNET_MQ_msg_extra(mvar, esize, type)
Allocate an envelope, with extra space allocated after the space needed by the message struct.
Definition: gnunet_mq_lib.h:63
#define GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT
Service returns result to client.
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:640
@ GNUNET_BLOCK_TYPE_ANY
Identifier for any block.
Closure for forward_reply()
const struct GNUNET_DATACACHE_Block * bd
Block details.
const struct GNUNET_DHT_PathElement * get_path
GET path taken.
unsigned int get_path_length
Number of entries in get_path.
const struct GNUNET_DHT_PathElement * put_path
PUT path taken by the block, array of peer identities.
struct GNUNET_PeerIdentity trunc_peer
If the path was truncated, this is the peer ID at which the path was truncated.
unsigned int put_path_length
Length of the put_path array.
struct GNUNET_TIME_Absolute expiration_time
When does the block expire?
Reply to a GET send from the service to a client.
Definition: dht.h:144
uint32_t put_path_length
Number of peers recorded in the outgoing path from source to the storgage location of this message.
Definition: dht.h:169
uint64_t unique_id
Unique ID of the matching GET request.
Definition: dht.h:180
struct GNUNET_TIME_AbsoluteNBO expiration
When does this entry expire?
Definition: dht.h:185
struct GNUNET_HashCode key
The key that was searched for.
Definition: dht.h:190
uint32_t type
The type for the data.
Definition: dht.h:153
uint32_t options
Message options, actually an 'enum GNUNET_DHT_RouteOption' value.
Definition: dht.h:163
uint32_t get_path_length
The number of peer identities recorded from the storage location to this peer.
Definition: dht.h:175
A (signed) path tracking a block's flow through the DHT is represented by an array of path elements,...
The identity of the host (wraps the signing key of the peer).

References ForwardReplyContext::bd, ch, GNUNET_DATACACHE_Block::data, GNUNET_DATACACHE_Block::data_size, env, GNUNET_DHT_ClientResultMessage::expiration, GNUNET_DATACACHE_Block::expiration_time, GDS_block_context, GDS_my_identity, GDS_stats, ForwardReplyContext::get_path, GNUNET_DHT_ClientResultMessage::get_path_length, ForwardReplyContext::get_path_length, GNUNET_array_append, GNUNET_BLOCK_check_reply(), GNUNET_BLOCK_REPLY_IRRELEVANT, GNUNET_BLOCK_REPLY_OK_DUPLICATE, GNUNET_BLOCK_REPLY_OK_LAST, GNUNET_BLOCK_REPLY_OK_MORE, GNUNET_BLOCK_REPLY_TYPE_NOT_SUPPORTED, GNUNET_BLOCK_TYPE_ANY, GNUNET_break, GNUNET_CRYPTO_hash(), GNUNET_DHT_RO_FIND_APPROXIMATE, GNUNET_DHT_RO_TRUNCATED, GNUNET_DHT_verify_path(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_h2s_full(), GNUNET_memcmp, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_DHT_CLIENT_RESULT, GNUNET_MQ_msg_extra, GNUNET_MQ_send(), GNUNET_NO, GNUNET_STATISTICS_update(), GNUNET_TIME_absolute_hton(), GNUNET_YES, GNUNET_DATACACHE_Block::key, GNUNET_DHT_ClientResultMessage::key, LOG, LOG_TRAFFIC, GNUNET_DHT_ClientResultMessage::options, GNUNET_DATACACHE_Block::put_path, GNUNET_DATACACHE_Block::put_path_length, GNUNET_DHT_ClientResultMessage::put_path_length, record(), remove_client_query_record(), GNUNET_DATACACHE_Block::ro, GNUNET_DATACACHE_Block::trunc_peer, GNUNET_DATACACHE_Block::type, GNUNET_DHT_ClientResultMessage::type, GNUNET_DHT_ClientResultMessage::unique_id, and value.

Referenced by GDS_CLIENTS_handle_reply().

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◆ GDS_CLIENTS_handle_reply()

bool GDS_CLIENTS_handle_reply ( const struct GNUNET_DATACACHE_Block bd,
const struct GNUNET_HashCode query_hash,
unsigned int  get_path_length,
const struct GNUNET_DHT_PathElement get_path 
)

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).

Parameters
bdblock details
query_hashhash of the original query, might not match key in bd
get_path_lengthnumber of entries in get_path
get_pathpath the reply has taken
Returns
true on success, false on failures

Definition at line 1061 of file gnunet-service-dht_clients.c.

1065{
1066 struct ForwardReplyContext frc;
1067 size_t msize = sizeof (struct GNUNET_DHT_ClientResultMessage)
1068 + bd->data_size
1070 * sizeof(struct GNUNET_DHT_PathElement);
1071#if SANITY_CHECKS > 1
1072 bool truncated = (0 != (bd->ro & GNUNET_DHT_RO_TRUNCATED));
1073#endif
1074
1075 if (msize >= GNUNET_MAX_MESSAGE_SIZE)
1076 {
1077 GNUNET_break (0);
1078 return false;
1079 }
1080#if SANITY_CHECKS > 1
1081 if (0 !=
1083 bd->data_size,
1084 bd->expiration_time,
1085 truncated
1086 ? &bd->trunc_peer
1087 : NULL,
1088 bd->put_path,
1089 bd->put_path_length,
1090 get_path,
1091 get_path_length,
1093 {
1094 GNUNET_break (0);
1095 return false;
1096 }
1097#endif
1098 frc.bd = bd;
1099 frc.get_path = get_path;
1100 frc.get_path_length = get_path_length;
1102 "Forwarding reply for query hash %s with GPL %u and PPL %u to client\n",
1103 GNUNET_h2s (query_hash),
1104 get_path_length,
1105 bd->put_path_length);
1106 if (0 ==
1108 query_hash,
1110 &frc))
1111 {
1113 "No matching client for reply for query %s\n",
1114 GNUNET_h2s (query_hash));
1116 "# REPLIES ignored for CLIENTS (no match)",
1117 1,
1118 GNUNET_NO);
1119 }
1120 return true;
1121}
static size_t data_size
Number of bytes in data.
static enum GNUNET_GenericReturnValue forward_reply(void *cls, const struct GNUNET_HashCode *query_hash, void *value)
Iterator over hash map entries that send a given reply to each of the matching clients.
#define GNUNET_MAX_MESSAGE_SIZE
Largest supported message (to be precise, one byte more than the largest possible message,...

References ForwardReplyContext::bd, GNUNET_DATACACHE_Block::data, data_size, GNUNET_DATACACHE_Block::data_size, GNUNET_DATACACHE_Block::expiration_time, forward_map, forward_reply(), GDS_my_identity, GDS_stats, ForwardReplyContext::get_path, GNUNET_DHT_ClientResultMessage::get_path_length, ForwardReplyContext::get_path_length, GNUNET_break, GNUNET_CONTAINER_multihashmap_get_multiple(), GNUNET_DHT_RO_TRUNCATED, GNUNET_DHT_verify_path(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_MAX_MESSAGE_SIZE, GNUNET_NO, GNUNET_STATISTICS_update(), LOG, GNUNET_DATACACHE_Block::put_path, GNUNET_DATACACHE_Block::put_path_length, GNUNET_DHT_ClientResultMessage::put_path_length, GNUNET_DATACACHE_Block::ro, and GNUNET_DATACACHE_Block::trunc_peer.

Referenced by handle_dht_local_put(), handle_dht_p2p_put(), handle_local_result(), and process_reply_with_path().

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◆ handle_dht_local_hello_get()

static void handle_dht_local_hello_get ( void *  cls,
const struct GNUNET_MessageHeader msg 
)
static

Handler for HELLO GET message.

Reply to client with a URL of our HELLO.

Parameters
clsthe client we received this message from
msgthe actual message received

Definition at line 1135 of file gnunet-service-dht_clients.c.

1137{
1138 struct ClientHandle *ch = cls;
1141 size_t slen = strlen (url) + 1;
1142 struct GNUNET_MessageHeader *hdr;
1143 struct GNUNET_MQ_Envelope *env;
1144
1146 "Handling request from local client for my HELLO\n");
1147 env = GNUNET_MQ_msg_extra (hdr,
1148 slen,
1150 memcpy (&hdr[1],
1151 url,
1152 slen);
1153 GNUNET_free (url);
1155 env);
1157}
struct GNUNET_CRYPTO_EddsaPrivateKey GDS_my_private_key
Our private key.
struct GNUNET_HELLO_Builder * GDS_my_hello
Our HELLO.
char * GNUNET_HELLO_builder_to_url(const struct GNUNET_HELLO_Builder *builder, const struct GNUNET_CRYPTO_EddsaPrivateKey *priv)
Generate GNUnet HELLO URI from a builder.
Definition: hello-uri.c:997
#define GNUNET_MESSAGE_TYPE_DHT_CLIENT_HELLO_URL
HELLO URL send between client and service (in either direction).
Header for all communications.

References ch, env, GDS_my_hello, GDS_my_private_key, GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_HELLO_builder_to_url(), GNUNET_log, GNUNET_MESSAGE_TYPE_DHT_CLIENT_HELLO_URL, GNUNET_MQ_msg_extra, GNUNET_MQ_send(), GNUNET_SERVICE_client_continue(), and GNUNET_CADET_Channel::mq.

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◆ check_dht_local_hello_offer()

static enum GNUNET_GenericReturnValue check_dht_local_hello_offer ( void *  cls,
const struct GNUNET_MessageHeader hdr 
)
static

Process a client HELLO message received from the service.

Parameters
clsthe client we received this message from
hdrHELLO URL message from the service.
Returns
GNUNET_OK if hdr is well-formed

Definition at line 1168 of file gnunet-service-dht_clients.c.

1170{
1171 uint16_t len = ntohs (hdr->size);
1172 const char *buf = (const char *) &hdr[1];
1173
1174 (void) cls;
1175 if ('\0' != buf[len - sizeof (*hdr) - 1])
1176 {
1177 GNUNET_break (0);
1178 return GNUNET_SYSERR;
1179 }
1180 return GNUNET_OK;
1181}

References GNUNET_break, GNUNET_OK, GNUNET_SYSERR, and GNUNET_MessageHeader::size.

◆ handle_dht_local_hello_offer()

static void handle_dht_local_hello_offer ( void *  cls,
const struct GNUNET_MessageHeader msg 
)
static

Handler for HELLO OFFER message.

Try to use the HELLO to connect to another peer.

Parameters
clsthe client we received this message from
msgthe actual message received

Definition at line 1192 of file gnunet-service-dht_clients.c.

1194{
1195 struct ClientHandle *ch = cls;
1196 const char *url = (const char *) &msg[1];
1197 struct GNUNET_HELLO_Parser *b;
1198
1200 "Local client provided HELLO URL %s\n",
1201 url);
1203 if (NULL == b)
1204 {
1205 GNUNET_break (0);
1207 return;
1208 }
1212 NULL);
1214}
struct GNUNET_MessageHeader * msg
Definition: 005.c:2
void GDS_try_connect(void *cls, const struct GNUNET_PeerIdentity *pid, const char *uri)
Callback function used to extract URIs from a builder.
void GNUNET_HELLO_parser_free(struct GNUNET_HELLO_Parser *parser)
Release resources of a builder.
Definition: hello-uri.c:435
const struct GNUNET_PeerIdentity * GNUNET_HELLO_parser_iterate(const struct GNUNET_HELLO_Parser *parser, GNUNET_HELLO_UriCallback uc, void *uc_cls)
Iterate over URIs in a parser.
Definition: hello-uri.c:1201
struct GNUNET_HELLO_Parser * GNUNET_HELLO_parser_from_url(const char *url)
Parse GNUnet HELLO url.
Definition: hello-uri.c:682
Context for parsing HELLOs.
Definition: hello-uri.c:258

References ch, GDS_try_connect(), GNUNET_break, GNUNET_ERROR_TYPE_DEBUG, GNUNET_HELLO_parser_free(), GNUNET_HELLO_parser_from_url(), GNUNET_HELLO_parser_iterate(), GNUNET_log, GNUNET_SERVICE_client_continue(), GNUNET_SERVICE_client_drop(), and msg.

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◆ handle_dht_local_monitor()

static void handle_dht_local_monitor ( void *  cls,
const struct GNUNET_DHT_MonitorStartStopMessage msg 
)
static

Handler for monitor start messages.

Parameters
clsthe client we received this message from
msgthe actual message received

Definition at line 1228 of file gnunet-service-dht_clients.c.

1230{
1231 struct ClientHandle *ch = cls;
1232 struct ClientMonitorRecord *r;
1233
1234 r = GNUNET_new (struct ClientMonitorRecord);
1235 r->ch = ch;
1236 r->type = ntohl (msg->type);
1237 r->get = ntohs (msg->get);
1238 r->get_resp = ntohs (msg->get_resp);
1239 r->put = ntohs (msg->put);
1240 if (0 != ntohs (msg->filter_key))
1241 r->key = msg->key;
1244 r);
1246}
uint16_t type
The type of the message (GNUNET_MESSAGE_TYPE_XXXX), in big-endian format.
uint16_t put
Flag whether to notify about PUT messages.
struct ClientHandle * ch
Client to notify of these requests.
enum GNUNET_BLOCK_Type type
Type of blocks that are of interest.
int16_t get
Flag whether to notify about GET messages.
struct GNUNET_HashCode key
Key of data of interest.
int16_t get_resp
Flag whether to notify about GET_REPONSE messages.

References ch, ClientMonitorRecord::ch, ClientMonitorRecord::get, ClientMonitorRecord::get_resp, GNUNET_CONTAINER_DLL_insert, GNUNET_new, GNUNET_SERVICE_client_continue(), ClientMonitorRecord::key, monitor_head, monitor_tail, msg, ClientMonitorRecord::put, GNUNET_MessageHeader::type, and ClientMonitorRecord::type.

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◆ handle_dht_local_monitor_stop()

static void handle_dht_local_monitor_stop ( void *  cls,
const struct GNUNET_DHT_MonitorStartStopMessage msg 
)
static

Handler for monitor stop messages.

Parameters
clsthe client we received this message from
msgthe actual message received

Definition at line 1256 of file gnunet-service-dht_clients.c.

1259{
1260 struct ClientHandle *ch = cls;
1261
1263 for (struct ClientMonitorRecord *r = monitor_head;
1264 NULL != r;
1265 r = r->next)
1266 {
1267 bool keys_match;
1268
1269 keys_match =
1270 (GNUNET_is_zero (&r->key))
1271 ? (0 == ntohs (msg->filter_key))
1272 : ( (0 != ntohs (msg->filter_key)) &&
1273 (! GNUNET_memcmp (&r->key,
1274 &msg->key)) );
1275 if ( (ch == r->ch) &&
1276 (ntohl (msg->type) == r->type) &&
1277 (r->get == msg->get) &&
1278 (r->get_resp == msg->get_resp) &&
1279 (r->put == msg->put) &&
1280 keys_match)
1281 {
1284 r);
1285 GNUNET_free (r);
1286 return; /* Delete only ONE entry */
1287 }
1288 }
1289}
#define GNUNET_is_zero(a)
Check that memory in a is all zeros.

References ch, GNUNET_CONTAINER_DLL_remove, GNUNET_free, GNUNET_is_zero, GNUNET_memcmp, GNUNET_SERVICE_client_continue(), monitor_head, monitor_tail, msg, ClientMonitorRecord::next, and GNUNET_MessageHeader::type.

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◆ for_matching_monitors()

static void for_matching_monitors ( enum GNUNET_BLOCK_Type  type,
const struct GNUNET_HashCode key,
MonitorAction  cb,
void *  cb_cls 
)
static

Call cb on all monitors that watch for blocks of type and key key.

Parameters
typethe type to match
keythe key to match
cbfunction to call
cb_clsclosure for cb

Definition at line 1313 of file gnunet-service-dht_clients.c.

1317{
1318 struct ClientHandle **cl = NULL;
1319 unsigned int cl_size = 0;
1320
1321 for (struct ClientMonitorRecord *m = monitor_head;
1322 NULL != m;
1323 m = m->next)
1324 {
1325 bool found = false;
1326
1327 if ( (GNUNET_BLOCK_TYPE_ANY != m->type) &&
1328 (m->type != type) )
1329 continue;
1330 if ( (! GNUNET_is_zero (&m->key)) &&
1331 (0 ==
1333 &m->key)) )
1334 continue;
1335 /* Don't send duplicates */
1336 for (unsigned i = 0; i < cl_size; i++)
1337 if (cl[i] == m->ch)
1338 {
1339 found = true;
1340 break;
1341 }
1342 if (found)
1343 continue;
1345 cl_size,
1346 m->ch);
1347 cb (cb_cls,
1348 m);
1349 }
1350 GNUNET_free (cl);
1351}
static struct GNUNET_ARM_MonitorHandle * m
Monitor connection with ARM.
Definition: gnunet-arm.c:103
static uint32_t type
Type string converted to DNS type value.

References GNUNET_array_append, GNUNET_BLOCK_TYPE_ANY, GNUNET_free, GNUNET_is_zero, GNUNET_memcmp, key, m, monitor_head, and type.

Referenced by GDS_CLIENTS_process_get(), GDS_CLIENTS_process_get_resp(), and GDS_CLIENTS_process_put().

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◆ get_action()

static void get_action ( void *  cls,
struct ClientMonitorRecord m 
)
static

Function called on monitors that match a GET.

Sends the GET notification to the monitor.

Parameters
clsa struct GetActionContext
ma matching monitor

Definition at line 1376 of file gnunet-service-dht_clients.c.

1378{
1379 struct GetActionContext *gac = cls;
1380 struct GNUNET_MQ_Envelope *env;
1381 struct GNUNET_DHT_MonitorGetMessage *mmsg;
1382
1383 env = GNUNET_MQ_msg (mmsg,
1385 mmsg->options = htonl (gac->options);
1386 mmsg->type = htonl (gac->type);
1387 mmsg->hop_count = htonl (gac->hop_count);
1389 mmsg->key = *gac->key;
1390 GNUNET_MQ_send (m->ch->mq,
1391 env);
1392}
#define GNUNET_MQ_msg(mvar, type)
Allocate a GNUNET_MQ_Envelope.
Definition: gnunet_mq_lib.h:78
#define GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET
Receive information about transiting GETs.
struct GNUNET_MQ_Handle * mq
Our control connection to the ARM service.
Message to monitor get requests going through peer, DHT service -> clients.
Definition: dht.h:334
uint32_t hop_count
Hop count.
Definition: dht.h:353
uint32_t options
Message options, actually an 'enum GNUNET_DHT_RouteOption' value.
Definition: dht.h:343
uint32_t desired_replication_level
Replication level for this message.
Definition: dht.h:358
struct GNUNET_HashCode key
The key to store the value under.
Definition: dht.h:368
uint32_t type
The type of data in the request.
Definition: dht.h:348
Closure for get_action();.
const struct GNUNET_HashCode * key
enum GNUNET_DHT_RouteOption options
enum GNUNET_BLOCK_Type type

References GNUNET_DHT_MonitorGetMessage::desired_replication_level, GetActionContext::desired_replication_level, env, GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_DHT_MonitorGetMessage::hop_count, GetActionContext::hop_count, GNUNET_DHT_MonitorGetMessage::key, GetActionContext::key, m, GNUNET_ARM_MonitorHandle::mq, GNUNET_DHT_MonitorGetMessage::options, GetActionContext::options, GNUNET_DHT_MonitorGetMessage::type, and GetActionContext::type.

Referenced by GDS_CLIENTS_process_get().

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◆ GDS_CLIENTS_process_get()

void GDS_CLIENTS_process_get ( enum GNUNET_DHT_RouteOption  options,
enum GNUNET_BLOCK_Type  type,
uint32_t  hop_count,
uint32_t  desired_replication_level,
const struct GNUNET_HashCode key 
)

Check if some client is monitoring GET messages and notify them in that case.

If tracked, path should include the local peer.

Parameters
optionsOptions, for instance RecordRoute, DemultiplexEverywhere.
typeThe type of data in the request.
hop_countHop count so far.
desired_replication_levelDesired replication level.
keyKey of the requested data.

Definition at line 1396 of file gnunet-service-dht_clients.c.

1401{
1402 struct GetActionContext gac = {
1403 .options = options,
1404 .type = type,
1405 .hop_count = hop_count,
1406 .desired_replication_level = desired_replication_level,
1407 .key = key
1408 };
1409
1411 key,
1412 &get_action,
1413 &gac);
1414}
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
static void for_matching_monitors(enum GNUNET_BLOCK_Type type, const struct GNUNET_HashCode *key, MonitorAction cb, void *cb_cls)
Call cb on all monitors that watch for blocks of type and key key.
static void get_action(void *cls, struct ClientMonitorRecord *m)
Function called on monitors that match a GET.

References GetActionContext::desired_replication_level, for_matching_monitors(), get_action(), GetActionContext::hop_count, key, options, GetActionContext::options, and type.

Referenced by handle_dht_local_get(), and handle_dht_p2p_get().

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◆ response_action()

static void response_action ( void *  cls,
struct ClientMonitorRecord m 
)
static

Function called on monitors that match a response.

Sends the response notification to the monitor.

Parameters
clsa struct ResponseActionContext
ma matching monitor

Definition at line 1436 of file gnunet-service-dht_clients.c.

1438{
1439 const struct ResponseActionContext *resp_ctx = cls;
1440 const struct GNUNET_DATACACHE_Block *bd = resp_ctx->bd;
1441 bool truncated = (0 != (bd->ro & GNUNET_DHT_RO_TRUNCATED));
1442 struct GNUNET_MQ_Envelope *env;
1444 struct GNUNET_DHT_PathElement *path;
1445 size_t msize;
1446
1447 msize = bd->data_size;
1448 msize += (resp_ctx->get_path_length + bd->put_path_length)
1449 * sizeof(struct GNUNET_DHT_PathElement);
1450 if (truncated)
1451 msize += sizeof (struct GNUNET_PeerIdentity);
1452 env = GNUNET_MQ_msg_extra (mmsg,
1453 msize,
1455 mmsg->type = htonl (bd->type);
1456 mmsg->put_path_length = htonl (bd->put_path_length);
1457 mmsg->get_path_length = htonl (resp_ctx->get_path_length);
1459 mmsg->key = bd->key;
1460 if (truncated)
1461 {
1462 void *tgt = &mmsg[1];
1463
1464 GNUNET_memcpy (tgt,
1465 &bd->trunc_peer,
1466 sizeof (struct GNUNET_PeerIdentity));
1467 path = (struct GNUNET_DHT_PathElement *)
1468 (tgt + sizeof (struct GNUNET_PeerIdentity));
1469 }
1470 else
1471 {
1472 path = (struct GNUNET_DHT_PathElement *) &mmsg[1];
1473 }
1474 GNUNET_memcpy (path,
1475 bd->put_path,
1476 bd->put_path_length * sizeof(struct GNUNET_DHT_PathElement));
1477 GNUNET_memcpy (path,
1478 resp_ctx->get_path,
1479 resp_ctx->get_path_length
1480 * sizeof(struct GNUNET_DHT_PathElement));
1481 GNUNET_memcpy (&path[resp_ctx->get_path_length],
1482 bd->data,
1483 bd->data_size);
1484 GNUNET_MQ_send (m->ch->mq,
1485 env);
1486}
#define GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET_RESP
Receive information about transiting GET responses.
Message to monitor get results going through peer, DHT service -> clients.
Definition: dht.h:377
struct GNUNET_HashCode key
The key of the corresponding GET request.
Definition: dht.h:416
struct GNUNET_TIME_AbsoluteNBO expiration_time
When does the content expire?
Definition: dht.h:411
uint32_t type
Content type.
Definition: dht.h:386
uint32_t get_path_length
Length of the GET path that follows (if tracked).
Definition: dht.h:406
uint32_t put_path_length
Length of the PUT path that follows (if tracked).
Definition: dht.h:401
Closure for response_action().
const struct GNUNET_DHT_PathElement * get_path
const struct GNUNET_DATACACHE_Block * bd

References ResponseActionContext::bd, GNUNET_DATACACHE_Block::data, GNUNET_DATACACHE_Block::data_size, env, GNUNET_DATACACHE_Block::expiration_time, GNUNET_DHT_MonitorGetRespMessage::expiration_time, ResponseActionContext::get_path, GNUNET_DHT_MonitorGetRespMessage::get_path_length, ResponseActionContext::get_path_length, GNUNET_DHT_RO_TRUNCATED, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_DHT_MONITOR_GET_RESP, GNUNET_MQ_msg_extra, GNUNET_MQ_send(), GNUNET_TIME_absolute_hton(), GNUNET_DATACACHE_Block::key, GNUNET_DHT_MonitorGetRespMessage::key, m, GNUNET_ARM_MonitorHandle::mq, GNUNET_DATACACHE_Block::put_path, GNUNET_DATACACHE_Block::put_path_length, GNUNET_DHT_MonitorGetRespMessage::put_path_length, GNUNET_DATACACHE_Block::ro, GNUNET_DATACACHE_Block::trunc_peer, GNUNET_DATACACHE_Block::type, and GNUNET_DHT_MonitorGetRespMessage::type.

Referenced by GDS_CLIENTS_process_get_resp().

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◆ GDS_CLIENTS_process_get_resp()

void GDS_CLIENTS_process_get_resp ( const struct GNUNET_DATACACHE_Block bd,
const struct GNUNET_DHT_PathElement get_path,
unsigned int  get_path_length 
)

Check if some client is monitoring GET RESP messages and notify them in that case.

Parameters
bdblock details
get_pathPeers on GET path (or NULL if not recorded).
get_path_lengthnumber of entries in get_path.

Definition at line 1490 of file gnunet-service-dht_clients.c.

1493{
1494 struct ResponseActionContext rac = {
1495 .bd = bd,
1496 .get_path = get_path,
1497 .get_path_length = get_path_length
1498 };
1499
1501 &bd->key,
1503 &rac);
1504}
static void response_action(void *cls, struct ClientMonitorRecord *m)
Function called on monitors that match a response.

References ResponseActionContext::bd, for_matching_monitors(), ResponseActionContext::get_path, ResponseActionContext::get_path_length, GNUNET_DATACACHE_Block::key, response_action(), and GNUNET_DATACACHE_Block::type.

Referenced by process_reply_with_path().

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◆ put_action()

static void put_action ( void *  cls,
struct ClientMonitorRecord m 
)
static

Function called on monitors that match a PUT.

Sends the PUT notification to the monitor.

Parameters
clsa struct PutActionContext
ma matching monitor

Definition at line 1526 of file gnunet-service-dht_clients.c.

1528{
1529 const struct PutActionContext *put_ctx = cls;
1530 const struct GNUNET_DATACACHE_Block *bd = put_ctx->bd;
1531 bool truncated = (0 != (bd->ro & GNUNET_DHT_RO_TRUNCATED));
1532 struct GNUNET_MQ_Envelope *env;
1533 struct GNUNET_DHT_MonitorPutMessage *mmsg;
1534 struct GNUNET_DHT_PathElement *msg_path;
1535 size_t msize;
1536
1537 msize = bd->data_size
1538 + bd->put_path_length
1539 * sizeof(struct GNUNET_DHT_PathElement);
1540 if (truncated)
1541 msize += sizeof (struct GNUNET_PeerIdentity);
1542 env = GNUNET_MQ_msg_extra (mmsg,
1543 msize,
1545 mmsg->options = htonl (bd->ro);
1546 mmsg->type = htonl (bd->type);
1547 mmsg->hop_count = htonl (put_ctx->hop_count);
1549 mmsg->put_path_length = htonl (bd->put_path_length);
1550 mmsg->key = bd->key;
1552 if (truncated)
1553 {
1554 void *tgt = &mmsg[1];
1555
1556 GNUNET_memcpy (tgt,
1557 &bd->trunc_peer,
1558 sizeof (struct GNUNET_PeerIdentity));
1559 msg_path = (struct GNUNET_DHT_PathElement *)
1560 (tgt + sizeof (struct GNUNET_PeerIdentity));
1561 }
1562 else
1563 {
1564 msg_path = (struct GNUNET_DHT_PathElement *) &mmsg[1];
1565 }
1566 GNUNET_memcpy (msg_path,
1567 bd->put_path,
1568 bd->put_path_length * sizeof(struct GNUNET_DHT_PathElement));
1569 GNUNET_memcpy (&msg_path[bd->put_path_length],
1570 bd->data,
1571 bd->data_size);
1572 GNUNET_MQ_send (m->ch->mq,
1573 env);
1574}
#define GNUNET_MESSAGE_TYPE_DHT_MONITOR_PUT
Receive information about transiting PUTs.
Message to monitor put requests going through peer, DHT service -> clients.
Definition: dht.h:239
uint32_t options
Message options, actually an 'enum GNUNET_DHT_RouteOption' value.
Definition: dht.h:248
struct GNUNET_TIME_AbsoluteNBO expiration_time
How long should this data persist?
Definition: dht.h:274
uint32_t desired_replication_level
Replication level for this message.
Definition: dht.h:263
struct GNUNET_HashCode key
The key to store the value under.
Definition: dht.h:279
uint32_t hop_count
Hop count so far.
Definition: dht.h:258
uint32_t type
The type of data in the request.
Definition: dht.h:253
uint32_t put_path_length
Number of peers recorded in the outgoing path from source to the storage location of this message.
Definition: dht.h:269
Closure for put_action().
const struct GNUNET_DATACACHE_Block * bd

References PutActionContext::bd, GNUNET_DATACACHE_Block::data, GNUNET_DATACACHE_Block::data_size, GNUNET_DHT_MonitorPutMessage::desired_replication_level, PutActionContext::desired_replication_level, env, GNUNET_DATACACHE_Block::expiration_time, GNUNET_DHT_MonitorPutMessage::expiration_time, GNUNET_DHT_RO_TRUNCATED, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_DHT_MONITOR_PUT, GNUNET_MQ_msg_extra, GNUNET_MQ_send(), GNUNET_TIME_absolute_hton(), GNUNET_DHT_MonitorPutMessage::hop_count, PutActionContext::hop_count, GNUNET_DATACACHE_Block::key, GNUNET_DHT_MonitorPutMessage::key, m, GNUNET_ARM_MonitorHandle::mq, GNUNET_DHT_MonitorPutMessage::options, GNUNET_DATACACHE_Block::put_path, GNUNET_DATACACHE_Block::put_path_length, GNUNET_DHT_MonitorPutMessage::put_path_length, GNUNET_DATACACHE_Block::ro, GNUNET_DATACACHE_Block::trunc_peer, GNUNET_DATACACHE_Block::type, and GNUNET_DHT_MonitorPutMessage::type.

Referenced by GDS_CLIENTS_process_put().

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◆ GDS_CLIENTS_process_put()

void GDS_CLIENTS_process_put ( const struct GNUNET_DATACACHE_Block bd,
uint32_t  hop_count,
uint32_t  desired_replication_level 
)

Check if some client is monitoring PUT messages and notify them in that case.

The path should include our own peer ID (if recorded).

Parameters
bddetails about the block
hop_countHop count so far.
desired_replication_levelDesired replication level.

Definition at line 1578 of file gnunet-service-dht_clients.c.

1581{
1582 struct PutActionContext put_ctx = {
1583 .bd = bd,
1584 .hop_count = hop_count,
1585 .desired_replication_level = desired_replication_level
1586 };
1587
1589 &bd->key,
1590 &put_action,
1591 &put_ctx);
1592}
static void put_action(void *cls, struct ClientMonitorRecord *m)
Function called on monitors that match a PUT.

References PutActionContext::bd, PutActionContext::desired_replication_level, for_matching_monitors(), PutActionContext::hop_count, GNUNET_DATACACHE_Block::key, put_action(), and GNUNET_DATACACHE_Block::type.

Referenced by handle_dht_local_put(), and handle_dht_p2p_put().

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◆ GDS_CLIENTS_init()

void GDS_CLIENTS_init ( void  )

Initialize client subsystem.

Definition at line 1602 of file gnunet-service-dht_clients.c.

1603{
1606 GNUNET_YES);
1609}
struct GNUNET_CONTAINER_MultiHashMap * GNUNET_CONTAINER_multihashmap_create(unsigned int len, int do_not_copy_keys)
Create a multi hash map.
struct GNUNET_CONTAINER_Heap * GNUNET_CONTAINER_heap_create(enum GNUNET_CONTAINER_HeapOrder order)
Create a new heap.
@ GNUNET_CONTAINER_HEAP_ORDER_MIN
Heap with the minimum cost at the root.

References forward_map, GNUNET_CONTAINER_heap_create(), GNUNET_CONTAINER_HEAP_ORDER_MIN, GNUNET_CONTAINER_multihashmap_create(), GNUNET_YES, and retry_heap.

Referenced by run().

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◆ GDS_CLIENTS_stop()

void GDS_CLIENTS_stop ( void  )

Shutdown client subsystem.

Definition at line 1616 of file gnunet-service-dht_clients.c.

1617{
1618 if (NULL != retry_task)
1619 {
1621 retry_task = NULL;
1622 }
1623}

References GNUNET_SCHEDULER_cancel(), and retry_task.

Referenced by shutdown_task().

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◆ GDS_CLIENTS_done()

void GDS_CLIENTS_done ( void  )

◆ __attribute__()

void __attribute__ ( (destructor)  )

MINIMIZE heap size (way below 128k) since this process doesn't need much.

Definition at line 1679 of file gnunet-service-dht_clients.c.

1681{
1682 if (NULL != retry_heap)
1683 {
1686 retry_heap = NULL;
1687 }
1688 if (NULL != forward_map)
1689 {
1692 forward_map = NULL;
1693 }
1694}
unsigned int GNUNET_CONTAINER_multihashmap_size(const struct GNUNET_CONTAINER_MultiHashMap *map)
Get the number of key-value pairs in the map.
void GNUNET_CONTAINER_multihashmap_destroy(struct GNUNET_CONTAINER_MultiHashMap *map)
Destroy a hash map.
unsigned int GNUNET_CONTAINER_heap_get_size(const struct GNUNET_CONTAINER_Heap *heap)
Get the current size of the heap.
void GNUNET_CONTAINER_heap_destroy(struct GNUNET_CONTAINER_Heap *heap)
Destroys the heap.

References forward_map, GNUNET_assert, GNUNET_CONTAINER_heap_destroy(), GNUNET_CONTAINER_heap_get_size(), GNUNET_CONTAINER_multihashmap_destroy(), GNUNET_CONTAINER_multihashmap_size(), and retry_heap.

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Variable Documentation

◆ GDS_block_context

◆ GDS_stats

◆ GDS_service

struct GNUNET_SERVICE_Handle* GDS_service

Handle for the service.

Definition at line 227 of file gnunet-service-dht_clients.c.

Referenced by run().

◆ GDS_cfg

const struct GNUNET_CONFIGURATION_Handle* GDS_cfg

The configuration the DHT service is running with.

Configuration we use.

Definition at line 232 of file gnunet-service-dht_clients.c.

Referenced by GDS_DATACACHE_init(), GDS_NEIGHBOURS_init(), load_underlay(), and run().

◆ monitor_head

struct ClientMonitorRecord* monitor_head
static

List of active monitoring requests.

Definition at line 237 of file gnunet-service-dht_clients.c.

Referenced by client_disconnect_cb(), for_matching_monitors(), handle_dht_local_monitor(), and handle_dht_local_monitor_stop().

◆ monitor_tail

struct ClientMonitorRecord* monitor_tail
static

List of active monitoring requests.

Definition at line 242 of file gnunet-service-dht_clients.c.

Referenced by client_disconnect_cb(), handle_dht_local_monitor(), and handle_dht_local_monitor_stop().

◆ forward_map

◆ retry_heap

struct GNUNET_CONTAINER_Heap* retry_heap
static

Heap with all of our client's request, sorted by retry time (earliest on top).

Definition at line 252 of file gnunet-service-dht_clients.c.

Referenced by __attribute__(), GDS_CLIENTS_init(), handle_dht_local_get(), and transmit_next_request_task().

◆ retry_task

struct GNUNET_SCHEDULER_Task* retry_task
static

Task that re-transmits requests (using retry_heap).

Definition at line 257 of file gnunet-service-dht_clients.c.

Referenced by GDS_CLIENTS_stop(), handle_dht_local_get(), and transmit_next_request_task().