GNUnet  0.18.1

Distributed Hash Table. More...

Collaboration diagram for DHT service:

Data Structures

struct  GNUNET_DHT_HopSignature
 Message signed by a peer when doing path tracking. More...
 
struct  GNUNET_DHT_PathElement
 A (signed) path tracking a block's flow through the DHT is represented by an array of path elements, each consisting of a peer on the path and a signature by which the peer affirms its routing decision. More...
 

Macros

#define GNUNET_DHT_DEFAULT_REPUBLISH_FREQUENCY
 Default republication frequency for stored data in the DHT. More...
 
#define GNUNET_DHT_MAXIMUM_REPLICATION_LEVEL   16
 Maximum allowed replication level for all requests. More...
 

Typedefs

typedef void(* GNUNET_DHT_GetIterator) (void *cls, struct GNUNET_TIME_Absolute exp, const struct GNUNET_HashCode *query_hash, const struct GNUNET_PeerIdentity *trunc_peer, const struct GNUNET_DHT_PathElement *get_path, unsigned int get_path_length, const struct GNUNET_DHT_PathElement *put_path, unsigned int put_path_length, enum GNUNET_BLOCK_Type type, size_t size, const void *data)
 Iterator called on each result obtained for a DHT operation that expects a reply. More...
 
typedef void(* GNUNET_DHT_MonitorGetCB) (void *cls, enum GNUNET_DHT_RouteOption options, enum GNUNET_BLOCK_Type type, uint32_t hop_count, uint32_t desired_replication_level, const struct GNUNET_HashCode *key)
 Callback called on each GET request going through the DHT. More...
 
typedef void(* GNUNET_DHT_MonitorGetRespCB) (void *cls, enum GNUNET_BLOCK_Type type, const struct GNUNET_PeerIdentity *trunc_peer, const struct GNUNET_DHT_PathElement *get_path, unsigned int get_path_length, const struct GNUNET_DHT_PathElement *put_path, unsigned int put_path_length, struct GNUNET_TIME_Absolute exp, const struct GNUNET_HashCode *key, const void *data, size_t size)
 Callback called on each GET reply going through the DHT. More...
 
typedef void(* GNUNET_DHT_MonitorPutCB) (void *cls, enum GNUNET_DHT_RouteOption options, enum GNUNET_BLOCK_Type type, uint32_t hop_count, uint32_t desired_replication_level, const struct GNUNET_PeerIdentity *trunc_peer, unsigned int path_length, const struct GNUNET_DHT_PathElement *path, struct GNUNET_TIME_Absolute exp, const struct GNUNET_HashCode *key, const void *data, size_t size)
 Callback called on each PUT request going through the DHT. More...
 
typedef void(* GNUNET_DHT_HelloGetCallback) (void *cls, const char *hello_url)
 Signature called with the result of a HELLO GET operation. More...
 

Enumerations

enum  GNUNET_DHT_RouteOption {
  GNUNET_DHT_RO_NONE = 0 , GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE = 1 , GNUNET_DHT_RO_RECORD_ROUTE = 2 , GNUNET_DHT_RO_FIND_APPROXIMATE = 4 ,
  GNUNET_DHT_RO_TRUNCATED = 8 , GNUNET_DHT_RO_LAST_HOP = 32768
}
 Options for routing. More...
 

Functions

struct GNUNET_DHT_HandleGNUNET_DHT_connect (const struct GNUNET_CONFIGURATION_Handle *cfg, unsigned int ht_len)
 Initialize the connection with the DHT service. More...
 
void GNUNET_DHT_disconnect (struct GNUNET_DHT_Handle *handle)
 Shutdown connection with the DHT service. More...
 
struct GNUNET_DHT_PutHandleGNUNET_DHT_put (struct GNUNET_DHT_Handle *handle, const struct GNUNET_HashCode *key, uint32_t desired_replication_level, enum GNUNET_DHT_RouteOption options, enum GNUNET_BLOCK_Type type, size_t size, const void *data, struct GNUNET_TIME_Absolute exp, GNUNET_SCHEDULER_TaskCallback cont, void *cont_cls)
 Perform a PUT operation storing data in the DHT. More...
 
void GNUNET_DHT_put_cancel (struct GNUNET_DHT_PutHandle *ph)
 Cancels a DHT PUT operation. More...
 
struct GNUNET_DHT_GetHandleGNUNET_DHT_get_start (struct GNUNET_DHT_Handle *handle, enum GNUNET_BLOCK_Type type, const struct GNUNET_HashCode *key, uint32_t desired_replication_level, enum GNUNET_DHT_RouteOption options, const void *xquery, size_t xquery_size, GNUNET_DHT_GetIterator iter, void *iter_cls)
 Perform an asynchronous GET operation on the DHT identified. More...
 
void GNUNET_DHT_get_filter_known_results (struct GNUNET_DHT_GetHandle *get_handle, unsigned int num_results, const struct GNUNET_HashCode *results)
 Tell the DHT not to return any of the following known results to this client. More...
 
void GNUNET_DHT_get_stop (struct GNUNET_DHT_GetHandle *get_handle)
 Stop async DHT-get. More...
 
struct GNUNET_DHT_MonitorHandleGNUNET_DHT_monitor_start (struct GNUNET_DHT_Handle *handle, enum GNUNET_BLOCK_Type type, const struct GNUNET_HashCode *key, GNUNET_DHT_MonitorGetCB get_cb, GNUNET_DHT_MonitorGetRespCB get_resp_cb, GNUNET_DHT_MonitorPutCB put_cb, void *cb_cls)
 Start monitoring the local DHT service. More...
 
void GNUNET_DHT_monitor_stop (struct GNUNET_DHT_MonitorHandle *handle)
 Stop monitoring. More...
 
char * GNUNET_DHT_pp2s (const struct GNUNET_DHT_PathElement *path, unsigned int path_len)
 Convert a peer path to a human-readable string. More...
 
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 last element of the get_path). More...
 
struct GNUNET_DHT_HelloGetHandleGNUNET_DHT_hello_get (struct GNUNET_DHT_Handle *dht_handle, GNUNET_DHT_HelloGetCallback cb, void *cb_cls)
 Obtain HELLO URL of the DHT identified by dht_handle. More...
 
void GNUNET_DHT_hello_get_cancel (struct GNUNET_DHT_HelloGetHandle *hgh)
 Cancel hello get operation. More...
 
void GNUNET_DHT_hello_offer (struct GNUNET_DHT_Handle *dht_handle, const char *url, GNUNET_SCHEDULER_TaskCallback cb, void *cb_cls)
 Offer HELLO URL of the DHT identified by dht_handle. More...
 

Detailed Description

Distributed Hash Table.

See also
Documentation

Macro Definition Documentation

◆ GNUNET_DHT_DEFAULT_REPUBLISH_FREQUENCY

#define GNUNET_DHT_DEFAULT_REPUBLISH_FREQUENCY
Value:
#define GNUNET_TIME_UNIT_MINUTES
One minute.
struct GNUNET_TIME_Relative GNUNET_TIME_relative_multiply(struct GNUNET_TIME_Relative rel, unsigned long long factor)
Multiply relative time by a given factor.
Definition: time.c:483

Default republication frequency for stored data in the DHT.

Definition at line 59 of file gnunet_dht_service.h.

◆ GNUNET_DHT_MAXIMUM_REPLICATION_LEVEL

#define GNUNET_DHT_MAXIMUM_REPLICATION_LEVEL   16

Maximum allowed replication level for all requests.

Definition at line 66 of file gnunet_dht_service.h.

Typedef Documentation

◆ GNUNET_DHT_GetIterator

typedef void(* GNUNET_DHT_GetIterator) (void *cls, struct GNUNET_TIME_Absolute exp, const struct GNUNET_HashCode *query_hash, const struct GNUNET_PeerIdentity *trunc_peer, const struct GNUNET_DHT_PathElement *get_path, unsigned int get_path_length, const struct GNUNET_DHT_PathElement *put_path, unsigned int put_path_length, enum GNUNET_BLOCK_Type type, size_t size, const void *data)

Iterator called on each result obtained for a DHT operation that expects a reply.

Parameters
clsclosure
expwhen will this value expire
query_hashkey of the query
trunc_peerpeer where the path was truncated, or NULL if the path is complete
get_pathpeers on reply path (or NULL if not recorded) [0] = datastore's first neighbor, [length - 1] = local peer
get_path_lengthnumber of entries in get_path
put_pathpeers on the PUT path (or NULL if not recorded) [0] = origin, [length - 1] = datastore
put_path_lengthnumber of entries in put_path, note that the last signature will be all zeros as we did not forward and thus did not sign!
typetype of the result
sizenumber of bytes in data
datapointer to the result data

Definition at line 288 of file gnunet_dht_service.h.

◆ GNUNET_DHT_MonitorGetCB

typedef void(* GNUNET_DHT_MonitorGetCB) (void *cls, enum GNUNET_DHT_RouteOption options, enum GNUNET_BLOCK_Type type, uint32_t hop_count, uint32_t desired_replication_level, const struct GNUNET_HashCode *key)

Callback called on each GET request going through the DHT.

Parameters
clsClosure.
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 371 of file gnunet_dht_service.h.

◆ GNUNET_DHT_MonitorGetRespCB

typedef void(* GNUNET_DHT_MonitorGetRespCB) (void *cls, enum GNUNET_BLOCK_Type type, const struct GNUNET_PeerIdentity *trunc_peer, const struct GNUNET_DHT_PathElement *get_path, unsigned int get_path_length, const struct GNUNET_DHT_PathElement *put_path, unsigned int put_path_length, struct GNUNET_TIME_Absolute exp, const struct GNUNET_HashCode *key, const void *data, size_t size)

Callback called on each GET reply going through the DHT.

Parameters
clsClosure.
typeThe type of data in the result.
trunc_peerpeer where the path was truncated, or NULL if the path is complete
get_pathPeers on GET path (or NULL if not recorded). note that the last signature will be all zeros as we did not forward and thus did not sign!
get_path_lengthnumber of entries in get_path.
put_pathpeers on the PUT path (or NULL if not recorded).
put_path_lengthnumber of entries in get_path.
expExpiration time of the data.
keyKey of the data.
dataPointer to the result data.
sizeNumber of bytes in data.

Definition at line 397 of file gnunet_dht_service.h.

◆ GNUNET_DHT_MonitorPutCB

typedef void(* GNUNET_DHT_MonitorPutCB) (void *cls, enum GNUNET_DHT_RouteOption options, enum GNUNET_BLOCK_Type type, uint32_t hop_count, uint32_t desired_replication_level, const struct GNUNET_PeerIdentity *trunc_peer, unsigned int path_length, const struct GNUNET_DHT_PathElement *path, struct GNUNET_TIME_Absolute exp, const struct GNUNET_HashCode *key, const void *data, size_t size)

Callback called on each PUT request going through the DHT.

Parameters
clsClosure.
optionsOptions, for instance RecordRoute, DemultiplexEverywhere.
typeThe type of data in the request.
hop_countHop count so far.
desired_replication_levelDesired replication level.
trunc_peerpeer where the path was truncated, or NULL if the path is complete
path_lengthnumber of entries in path (or 0 if not recorded).
pathpeers on the PUT path (or NULL if not recorded). note that the last signature will be all zeros as we did not forward and thus did not sign!
expExpiration time of the data.
keyKey under which data is to be stored.
dataPointer to the data carried.
sizeNumber of bytes in data.

Definition at line 429 of file gnunet_dht_service.h.

◆ GNUNET_DHT_HelloGetCallback

typedef void(* GNUNET_DHT_HelloGetCallback) (void *cls, const char *hello_url)

Signature called with the result of a HELLO GET operation.

Parameters
clsclosure
hello_urlthe resulting HELLO URL, NULL on error

Definition at line 533 of file gnunet_dht_service.h.

Enumeration Type Documentation

◆ GNUNET_DHT_RouteOption

Options for routing.

Enumerator
GNUNET_DHT_RO_NONE 

Default.

Do nothing special.

GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE 

Each peer along the way should process the request (otherwise only peers locally closest to the key when the random walk is over should look at it).

GNUNET_DHT_RO_RECORD_ROUTE 

We should keep track of the route that the message took in the P2P network.

GNUNET_DHT_RO_FIND_APPROXIMATE 

Approximate results are fine.

GNUNET_DHT_RO_TRUNCATED 

Flag set if the path was truncated.

GNUNET_DHT_RO_LAST_HOP 

Flag given to monitors if this was the last hop for a GET/PUT.

This is only used for internal processing.

Definition at line 88 of file gnunet_dht_service.h.

89 {
94 
101 
107 
112 
117 
122  GNUNET_DHT_RO_LAST_HOP = 32768
123 };
@ GNUNET_DHT_RO_TRUNCATED
Flag set if the path was truncated.
@ GNUNET_DHT_RO_NONE
Default.
@ GNUNET_DHT_RO_RECORD_ROUTE
We should keep track of the route that the message took in the P2P network.
@ GNUNET_DHT_RO_LAST_HOP
Flag given to monitors if this was the last hop for a GET/PUT.
@ GNUNET_DHT_RO_FIND_APPROXIMATE
Approximate results are fine.
@ GNUNET_DHT_RO_DEMULTIPLEX_EVERYWHERE
Each peer along the way should process the request (otherwise only peers locally closest to the key w...

Function Documentation

◆ GNUNET_DHT_connect()

struct GNUNET_DHT_Handle* GNUNET_DHT_connect ( const struct GNUNET_CONFIGURATION_Handle cfg,
unsigned int  ht_len 
)

Initialize the connection with the DHT service.

Parameters
cfgconfiguration to use
ht_lensize of the internal hash table to use for processing multiple GET/FIND requests in parallel
Returns
NULL on error

Definition at line 1039 of file dht_api.c.

1041 {
1042  struct GNUNET_DHT_Handle *handle;
1043 
1044  handle = GNUNET_new (struct GNUNET_DHT_Handle);
1045  handle->cfg = cfg;
1046  handle->uid_gen
1048  UINT64_MAX);
1049  handle->active_requests
1051  GNUNET_YES);
1052  if (GNUNET_NO == try_connect (handle))
1053  {
1055  return NULL;
1056  }
1057  return handle;
1058 }
static enum GNUNET_GenericReturnValue try_connect(struct GNUNET_DHT_Handle *h)
Try to (re)connect to the DHT service.
Definition: dht_api.c:995
static const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration we are using.
Definition: gnunet-abd.c:36
static struct GNUNET_DNS_Handle * handle
Handle to transport service.
uint64_t GNUNET_CRYPTO_random_u64(enum GNUNET_CRYPTO_Quality mode, uint64_t max)
Generate a random unsigned 64-bit value.
@ GNUNET_CRYPTO_QUALITY_WEAK
No good quality of the operation is needed (i.e., random numbers can be pseudo-random).
void GNUNET_DHT_disconnect(struct GNUNET_DHT_Handle *handle)
Shutdown connection with the DHT service.
Definition: dht_api.c:1062
struct GNUNET_CONTAINER_MultiHashMap * GNUNET_CONTAINER_multihashmap_create(unsigned int len, int do_not_copy_keys)
Create a multi hash map.
@ GNUNET_YES
@ GNUNET_NO
Definition: gnunet_common.h:98
#define GNUNET_new(type)
Allocate a struct or union of the given type.
Connection to the DHT service.
Definition: dht_api.c:237
const struct GNUNET_CONFIGURATION_Handle * cfg
Configuration to use.
Definition: dns_api.c:66

References cfg, GNUNET_DNS_Handle::cfg, GNUNET_CONTAINER_multihashmap_create(), GNUNET_CRYPTO_QUALITY_WEAK, GNUNET_CRYPTO_random_u64(), GNUNET_DHT_disconnect(), GNUNET_new, GNUNET_NO, GNUNET_YES, handle, and try_connect().

Referenced by advertise_dns_exit(), dht_ca(), dht_connect(), dht_connect_adapter(), GCD_init(), and run().

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◆ GNUNET_DHT_disconnect()

void GNUNET_DHT_disconnect ( struct GNUNET_DHT_Handle handle)

Shutdown connection with the DHT service.

Parameters
handleconnection to shut down

Definition at line 1062 of file dht_api.c.

1063 {
1064  struct GNUNET_DHT_PutHandle *ph;
1065 
1066  GNUNET_assert (0 ==
1067  GNUNET_CONTAINER_multihashmap_size (handle->active_requests));
1068  while (NULL != (ph = handle->put_head))
1069  {
1070  if (NULL != ph->cont)
1071  ph->cont (ph->cont_cls);
1073  }
1074  if (NULL != handle->mq)
1075  {
1077  handle->mq = NULL;
1078  }
1079  if (NULL != handle->reconnect_task)
1080  {
1082  handle->reconnect_task = NULL;
1083  }
1084  GNUNET_CONTAINER_multihashmap_destroy (handle->active_requests);
1085  GNUNET_free (handle);
1086 }
static struct GNUNET_ATS_PerformanceHandle * ph
ATS performance handle used.
Definition: gnunet-ats.c:116
void GNUNET_DHT_put_cancel(struct GNUNET_DHT_PutHandle *ph)
Cancels a DHT PUT operation.
Definition: dht_api.c:1148
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.
#define GNUNET_assert(cond)
Use this for fatal errors that cannot be handled.
#define GNUNET_free(ptr)
Wrapper around free.
void GNUNET_MQ_destroy(struct GNUNET_MQ_Handle *mq)
Destroy the message queue.
Definition: mq.c:686
void * GNUNET_SCHEDULER_cancel(struct GNUNET_SCHEDULER_Task *task)
Cancel the task with the specified identifier.
Definition: scheduler.c:943
Handle to a PUT request.
Definition: dht_api.c:45
struct GNUNET_SCHEDULER_Task * reconnect_task
Task to reconnect to the service.
Definition: dns_api.c:81
struct GNUNET_MQ_Handle * mq
Connection to DNS service, or NULL.
Definition: dns_api.c:61

References GNUNET_assert, GNUNET_CONTAINER_multihashmap_destroy(), GNUNET_CONTAINER_multihashmap_size(), GNUNET_DHT_put_cancel(), GNUNET_free, GNUNET_MQ_destroy(), GNUNET_SCHEDULER_cancel(), handle, GNUNET_DNS_Handle::mq, ph, and GNUNET_DNS_Handle::reconnect_task.

Referenced by cleanup(), cleanup_task(), dht_da(), dht_disconnect(), dht_disconnect_adapter(), GCD_shutdown(), GNUNET_DHT_connect(), and shutdown_task().

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◆ GNUNET_DHT_put()

struct GNUNET_DHT_PutHandle* GNUNET_DHT_put ( struct GNUNET_DHT_Handle handle,
const struct GNUNET_HashCode key,
uint32_t  desired_replication_level,
enum GNUNET_DHT_RouteOption  options,
enum GNUNET_BLOCK_Type  type,
size_t  size,
const void *  data,
struct GNUNET_TIME_Absolute  exp,
GNUNET_SCHEDULER_TaskCallback  cont,
void *  cont_cls 
)

Perform a PUT operation storing data in the DHT.

Parameters
handlehandle to DHT service
keythe key to store under
desired_replication_levelestimate of how many nearest peers this request should reach
optionsrouting options for this message
typetype of the value
sizenumber of bytes in data; must be less than 64k
datathe data to store
expdesired expiration time for the value
contcontinuation to call when done (transmitting request to service) You must not call GNUNET_DHT_disconnect in this continuation
cont_clsclosure for cont
Returns
handle to cancel the "PUT" operation, NULL on error (size too big)

Definition at line 1090 of file dht_api.c.

1100 {
1101  struct GNUNET_MQ_Envelope *env;
1102  struct GNUNET_DHT_ClientPutMessage *put_msg;
1103  size_t msize;
1104  struct GNUNET_DHT_PutHandle *ph;
1105 
1106  msize = sizeof(struct GNUNET_DHT_ClientPutMessage) + size;
1107  if ((msize >= GNUNET_MAX_MESSAGE_SIZE) ||
1109  {
1110  GNUNET_break (0);
1111  return NULL;
1112  }
1113  if (NULL == handle->mq)
1114  return NULL;
1116  "Sending PUT for %s to DHT via %p\n",
1117  GNUNET_h2s (key),
1118  handle);
1119  ph = GNUNET_new (struct GNUNET_DHT_PutHandle);
1120  ph->dht_handle = handle;
1121  ph->cont = cont;
1122  ph->cont_cls = cont_cls;
1124  handle->put_tail,
1125  ph);
1126  env = GNUNET_MQ_msg_extra (put_msg,
1127  size,
1130  &handle_put_cont,
1131  ph);
1132  ph->env = env;
1133  put_msg->type = htonl ((uint32_t) type);
1134  put_msg->options = htonl ((uint32_t) options);
1136  put_msg->expiration = GNUNET_TIME_absolute_hton (exp);
1137  put_msg->key = *key;
1138  GNUNET_memcpy (&put_msg[1],
1139  data,
1140  size);
1142  env);
1143  return ph;
1144 }
struct GNUNET_GETOPT_CommandLineOption options[]
Definition: 002.c:5
struct GNUNET_MQ_Envelope * env
Definition: 005.c:1
static void handle_put_cont(void *cls)
Process a MQ PUT transmission notification.
Definition: dht_api.c:973
#define LOG(kind,...)
Definition: dht_api.c:38
struct GNUNET_HashCode key
The key used in the DHT.
uint32_t data
The data value.
#define GNUNET_MAX_MESSAGE_SIZE
Largest supported message (to be precise, one byte more than the largest possible message,...
#define GNUNET_CONTAINER_DLL_insert_tail(head, tail, element)
Insert an element at the tail of a DLL.
#define GNUNET_memcpy(dst, src, n)
Call memcpy() but check for n being 0 first.
#define GNUNET_break(cond)
Use this for internal assertion violations that are not fatal (can be handled) but should not occur.
const char * GNUNET_h2s(const struct GNUNET_HashCode *hc)
Convert a hash value to a string (for printing debug messages).
@ GNUNET_ERROR_TYPE_DEBUG
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:303
#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:56
void GNUNET_MQ_notify_sent(struct GNUNET_MQ_Envelope *ev, GNUNET_SCHEDULER_TaskCallback cb, void *cb_cls)
Call a callback once the envelope has been sent, that is, sending it can not be canceled anymore.
Definition: mq.c:641
#define GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT
Client wants to store item in DHT.
struct GNUNET_TIME_AbsoluteNBO GNUNET_TIME_absolute_hton(struct GNUNET_TIME_Absolute a)
Convert absolute time to network byte order.
Definition: time.c:637
static unsigned int size
Size of the "table".
Definition: peer.c:67
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
uint32_t desired_replication_level
Replication level for this message.
Definition: dht.h:219
struct GNUNET_TIME_AbsoluteNBO expiration
How long should this data persist?
Definition: dht.h:224
enum GNUNET_TESTBED_UnderlayLinkModelType type
the type of this model

References data, GNUNET_DHT_ClientPutMessage::desired_replication_level, env, GNUNET_DHT_ClientPutMessage::expiration, GNUNET_break, GNUNET_CONTAINER_DLL_insert_tail, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_MAX_MESSAGE_SIZE, GNUNET_memcpy, GNUNET_MESSAGE_TYPE_DHT_CLIENT_PUT, GNUNET_MQ_msg_extra, GNUNET_MQ_notify_sent(), GNUNET_MQ_send(), GNUNET_new, GNUNET_TIME_absolute_hton(), handle, handle_put_cont(), GNUNET_DHT_ClientPutMessage::key, key, LOG, GNUNET_DNS_Handle::mq, options, GNUNET_DHT_ClientPutMessage::options, ph, size, GNUNET_DHT_ClientPutMessage::type, and type.

Referenced by announce_id(), delayed_put(), do_dht_put(), initiate_put_from_pipe_trigger(), process_dht_put_content(), regex_iterator(), and run().

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◆ GNUNET_DHT_put_cancel()

void GNUNET_DHT_put_cancel ( struct GNUNET_DHT_PutHandle ph)

Cancels a DHT PUT operation.

Note that the PUT request may still go out over the network (we can't stop that); However, if the PUT has not yet been sent to the service, cancelling the PUT will stop this from happening (but there is no way for the user of this API to tell if that is the case). The only use for this API is to prevent a later call to 'cont' from GNUNET_DHT_put (e.g. because the system is shutting down).

Parameters
phput operation to cancel ('cont' will no longer be called)

Definition at line 1148 of file dht_api.c.

1149 {
1150  struct GNUNET_DHT_Handle *handle = ph->dht_handle;
1151 
1152  if (NULL != ph->env)
1153  GNUNET_MQ_notify_sent (ph->env,
1154  NULL,
1155  NULL);
1157  handle->put_tail,
1158  ph);
1159  GNUNET_free (ph);
1160 }
#define GNUNET_CONTAINER_DLL_remove(head, tail, element)
Remove an element from a DLL.

References GNUNET_CONTAINER_DLL_remove, GNUNET_free, GNUNET_MQ_notify_sent(), handle, and ph.

Referenced by cleanup(), do_dht_put(), do_disconnect(), do_shutdown(), GNUNET_DHT_disconnect(), GSF_put_done_(), handle_put_cont(), and shutdown_task().

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◆ GNUNET_DHT_get_start()

struct GNUNET_DHT_GetHandle* GNUNET_DHT_get_start ( struct GNUNET_DHT_Handle handle,
enum GNUNET_BLOCK_Type  type,
const struct GNUNET_HashCode key,
uint32_t  desired_replication_level,
enum GNUNET_DHT_RouteOption  options,
const void *  xquery,
size_t  xquery_size,
GNUNET_DHT_GetIterator  iter,
void *  iter_cls 
)

Perform an asynchronous GET operation on the DHT identified.

See also #GNUNET_BLOCK_evaluate.

Parameters
handlehandle to the DHT service
typeexpected type of the response object
keythe key to look up
desired_replication_levelestimate of how many nearest peers this request should reach
optionsrouting options for this message
xqueryextended query data (can be NULL, depending on type)
xquery_sizenumber of bytes in xquery
iterfunction to call on each result
iter_clsclosure for iter
Returns
handle to stop the async get

Definition at line 1164 of file dht_api.c.

1173 {
1174  struct GNUNET_DHT_GetHandle *gh;
1175  size_t msize;
1176 
1177  msize = sizeof(struct GNUNET_DHT_ClientGetMessage) + xquery_size;
1178  if ((msize >= GNUNET_MAX_MESSAGE_SIZE) ||
1179  (xquery_size >= GNUNET_MAX_MESSAGE_SIZE))
1180  {
1181  GNUNET_break (0);
1182  return NULL;
1183  }
1185  "Sending query for %s to DHT %p\n",
1186  GNUNET_h2s (key),
1187  handle);
1188  gh = GNUNET_malloc (sizeof(struct GNUNET_DHT_GetHandle)
1189  + xquery_size);
1190  gh->iter = iter;
1191  gh->iter_cls = iter_cls;
1192  gh->dht_handle = handle;
1193  gh->key = *key;
1194  gh->unique_id = ++handle->uid_gen;
1195  gh->xquery_size = xquery_size;
1196  gh->desired_replication_level = desired_replication_level;
1197  gh->type = type;
1198  gh->options = options;
1199  GNUNET_memcpy (&gh[1],
1200  xquery,
1201  xquery_size);
1202  GNUNET_CONTAINER_multihashmap_put (handle->active_requests,
1203  &gh->key,
1204  gh,
1206  if (NULL != handle->mq)
1207  send_get (gh);
1208  return gh;
1209 }
static void send_get(struct GNUNET_DHT_GetHandle *gh)
Send GET message for a get_handle to DHT.
Definition: dht_api.c:318
static struct GNUNET_TRANSPORT_HelloGetHandle * gh
Pending GNUNET_TRANSPORT_hello_get() operation.
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_malloc(size)
Wrapper around malloc.
DHT GET message sent from clients to service.
Definition: dht.h:72
uint32_t desired_replication_level
Replication level for this message.
Definition: dht.h:86
Handle to a GET request.
Definition: dht_api.c:81

References GNUNET_DHT_ClientGetMessage::desired_replication_level, gh, GNUNET_break, GNUNET_CONTAINER_multihashmap_put(), GNUNET_CONTAINER_MULTIHASHMAPOPTION_MULTIPLE, GNUNET_ERROR_TYPE_DEBUG, GNUNET_h2s(), GNUNET_malloc, GNUNET_MAX_MESSAGE_SIZE, GNUNET_memcpy, handle, key, LOG, GNUNET_DNS_Handle::mq, options, send_get(), and type.

Referenced by delayed_get(), GCD_search(), GSF_dht_lookup_(), regex_find_path(), REGEX_INTERNAL_search(), regex_next_edge(), run(), and start_dht_request().

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◆ GNUNET_DHT_get_filter_known_results()

void GNUNET_DHT_get_filter_known_results ( struct GNUNET_DHT_GetHandle get_handle,
unsigned int  num_results,
const struct GNUNET_HashCode results 
)

Tell the DHT not to return any of the following known results to this client.

Parameters
get_handleget operation for which results should be filtered
num_resultsnumber of results to be blocked that are provided in this call (size of the results array)
resultsarray of hash codes over the data of the results to be blocked

Definition at line 1213 of file dht_api.c.

1216 {
1217  unsigned int needed;
1218  unsigned int had;
1219 
1221  needed = had + num_results;
1222  if (needed > get_handle->seen_results_size)
1225  needed);
1227  results,
1228  num_results * sizeof(struct GNUNET_HashCode));
1229  get_handle->seen_results_end += num_results;
1230  if (NULL != get_handle->dht_handle->mq)
1232  had);
1233 }
static void send_get_known_results(struct GNUNET_DHT_GetHandle *gh, unsigned int transmission_offset_start)
Send GET message(s) for indicating which results are already known for a get_handle to DHT.
Definition: dht_api.c:350
static struct GNUNET_DHT_GetHandle * get_handle
Handle for the get request.
static unsigned int results
#define GNUNET_array_grow(arr, size, tsize)
Grow a well-typed (!) array.
unsigned int seen_results_end
Offset into the seen_results array marking the end of the positions that are actually used.
Definition: dht_api.c:143
struct GNUNET_HashCode * seen_results
Array of hash codes over the results that we have already seen.
Definition: dht_api.c:101
struct GNUNET_DHT_Handle * dht_handle
Main handle to this DHT api.
Definition: dht_api.c:95
unsigned int seen_results_size
Size of the seen_results array.
Definition: dht_api.c:137
struct GNUNET_MQ_Handle * mq
Connection to DHT service.
Definition: dht_api.c:246
A 512-bit hashcode.

References GNUNET_DHT_GetHandle::dht_handle, get_handle, GNUNET_array_grow, GNUNET_memcpy, GNUNET_DHT_Handle::mq, results, GNUNET_DHT_GetHandle::seen_results, GNUNET_DHT_GetHandle::seen_results_end, GNUNET_DHT_GetHandle::seen_results_size, and send_get_known_results().

Referenced by GSF_dht_lookup_(), and GSF_pending_request_update_().

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◆ GNUNET_DHT_get_stop()

void GNUNET_DHT_get_stop ( struct GNUNET_DHT_GetHandle get_handle)

Stop async DHT-get.

Frees associated resources.

Parameters
get_handleGET operation to stop.

Definition at line 1237 of file dht_api.c.

1238 {
1240 
1242  "Sending STOP for %s to DHT via %p\n",
1244  handle);
1245  if (NULL != handle->mq)
1246  {
1247  struct GNUNET_MQ_Envelope *env;
1248  struct GNUNET_DHT_ClientGetStopMessage *stop_msg;
1249 
1250  env = GNUNET_MQ_msg (stop_msg,
1252  stop_msg->reserved = htonl (0);
1253  stop_msg->unique_id = get_handle->unique_id;
1254  stop_msg->key = get_handle->key;
1256  env);
1257  }
1259  GNUNET_CONTAINER_multihashmap_remove (handle->active_requests,
1260  &get_handle->key,
1261  get_handle));
1264  0);
1266 }
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.
#define GNUNET_MQ_msg(mvar, type)
Allocate a GNUNET_MQ_Envelope.
Definition: gnunet_mq_lib.h:71
#define GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_STOP
Client wants to stop search in DHT.
Message which indicates the DHT should cancel outstanding requests and discard any state.
Definition: dht.h:44
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
uint32_t reserved
Always zero.
Definition: dht.h:53
struct GNUNET_HashCode key
Key that this get request is for.
Definition: dht_api.c:106
uint64_t unique_id
Unique identifier for this request (for key collisions).
Definition: dht_api.c:111

References GNUNET_DHT_GetHandle::dht_handle, env, get_handle, GNUNET_array_grow, GNUNET_assert, GNUNET_CONTAINER_multihashmap_remove(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_free, GNUNET_h2s(), GNUNET_MESSAGE_TYPE_DHT_CLIENT_GET_STOP, GNUNET_MQ_msg, GNUNET_MQ_send(), GNUNET_YES, handle, GNUNET_DHT_ClientGetStopMessage::key, GNUNET_DHT_GetHandle::key, LOG, GNUNET_DNS_Handle::mq, GNUNET_DHT_ClientGetStopMessage::reserved, GNUNET_DHT_GetHandle::seen_results, GNUNET_DHT_GetHandle::seen_results_end, GNUNET_DHT_ClientGetStopMessage::unique_id, and GNUNET_DHT_GetHandle::unique_id.

Referenced by cancel_get(), clean_request(), cleanup(), cleanup_task(), do_shutdown(), GCD_search_stop(), get_iter(), get_result_iterator(), GNS_resolver_lookup_cancel(), GSF_dht_lookup_(), GSF_pending_request_cancel_(), handle_dht_response(), and regex_cancel_dht_get().

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◆ GNUNET_DHT_monitor_start()

struct GNUNET_DHT_MonitorHandle* GNUNET_DHT_monitor_start ( struct GNUNET_DHT_Handle handle,
enum GNUNET_BLOCK_Type  type,
const struct GNUNET_HashCode key,
GNUNET_DHT_MonitorGetCB  get_cb,
GNUNET_DHT_MonitorGetRespCB  get_resp_cb,
GNUNET_DHT_MonitorPutCB  put_cb,
void *  cb_cls 
)

Start monitoring the local DHT service.

Parameters
handleHandle to the DHT service.
typeType of blocks that are of interest.
keyKey of data of interest, NULL for all.
get_cbCallback to process monitored get messages.
get_resp_cbCallback to process monitored get response messages.
put_cbCallback to process monitored put messages.
cb_clsClosure for callbacks
Returns
Handle to stop monitoring.

Definition at line 1270 of file dht_api.c.

1277 {
1278  struct GNUNET_DHT_MonitorHandle *mh;
1279 
1281  mh->get_cb = get_cb;
1282  mh->get_resp_cb = get_resp_cb;
1283  mh->put_cb = put_cb;
1284  mh->cb_cls = cb_cls;
1285  mh->type = type;
1286  mh->dht_handle = handle;
1287  if (NULL != key)
1288  {
1289  mh->key = GNUNET_new (struct GNUNET_HashCode);
1290  *mh->key = *key;
1291  }
1292  GNUNET_CONTAINER_DLL_insert (handle->monitor_head,
1293  handle->monitor_tail,
1294  mh);
1295  if (NULL != handle->mq)
1297  return mh;
1298 }
static void send_monitor_start(struct GNUNET_DHT_MonitorHandle *mh)
Send GNUNET_MESSAGE_TYPE_DHT_MONITOR_START message.
Definition: dht_api.c:416
static struct GNUNET_CADET_Handle * mh
Cadet handle.
Definition: gnunet-cadet.c:92
#define GNUNET_CONTAINER_DLL_insert(head, tail, element)
Insert an element at the head of a DLL.
static enum GNUNET_GenericReturnValue get_cb(void *cls, const struct GNUNET_HashCode *key, void *value)
Function called during GET to find matching blocks.
static enum GNUNET_GenericReturnValue put_cb(void *cls, const struct GNUNET_HashCode *key, void *value)
Function called during PUT to detect if an equivalent block already exists.
Handle to a monitoring request.
Definition: dht_api.c:151
GNUNET_DHT_MonitorGetRespCB get_resp_cb
Callback for each received message of type get response.
Definition: dht_api.c:185
void * cb_cls
Closure for get_cb, put_cb and get_resp_cb.
Definition: dht_api.c:195

References GNUNET_DHT_MonitorHandle::cb_cls, get_cb(), GNUNET_DHT_MonitorHandle::get_resp_cb, GNUNET_CONTAINER_DLL_insert, GNUNET_new, handle, key, mh, GNUNET_DNS_Handle::mq, put_cb(), send_monitor_start(), and type.

Referenced by run().

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◆ GNUNET_DHT_monitor_stop()

void GNUNET_DHT_monitor_stop ( struct GNUNET_DHT_MonitorHandle handle)

Stop monitoring.

On return handle will no longer be valid, caller must not use it anymore.

Parameters
handleThe handle to the monitor request returned by GNUNET_DHT_monitor_start().

Definition at line 1302 of file dht_api.c.

1303 {
1304  struct GNUNET_DHT_Handle *handle = mh->dht_handle;
1306  struct GNUNET_MQ_Envelope *env;
1307 
1308  GNUNET_CONTAINER_DLL_remove (handle->monitor_head,
1309  handle->monitor_tail,
1310  mh);
1311  env = GNUNET_MQ_msg (m,
1313  m->type = htonl (mh->type);
1314  m->get = htons (NULL != mh->get_cb);
1315  m->get_resp = htons (NULL != mh->get_resp_cb);
1316  m->put = htons (NULL != mh->put_cb);
1317  if (NULL != mh->key)
1318  {
1319  m->filter_key = htons (1);
1320  m->key = *mh->key;
1321  }
1323  env);
1324  GNUNET_free (mh->key);
1325  GNUNET_free (mh);
1326 }
static struct GNUNET_ARM_MonitorHandle * m
Monitor connection with ARM.
Definition: gnunet-arm.c:104
#define GNUNET_MESSAGE_TYPE_DHT_MONITOR_STOP
Stop information about transiting messages.
Message to request monitoring messages, clients -> DHT service.
Definition: dht.h:291

References env, GNUNET_CONTAINER_DLL_remove, GNUNET_free, GNUNET_MESSAGE_TYPE_DHT_MONITOR_STOP, GNUNET_MQ_msg, GNUNET_MQ_send(), handle, m, mh, and GNUNET_DNS_Handle::mq.

Referenced by cleanup_task().

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◆ GNUNET_DHT_pp2s()

char* GNUNET_DHT_pp2s ( const struct GNUNET_DHT_PathElement path,
unsigned int  path_len 
)

Convert a peer path to a human-readable string.

Parameters
patharray of path elements to convert to a string
path_lenlength of the path array
Returns
string representing the array of pids

Definition at line 1330 of file dht_api.c.

1332 {
1333  char *buf;
1334  size_t off;
1335  size_t plen = path_len * 5 + 1;
1336 
1337  GNUNET_assert (path_len < UINT32_MAX / 5);
1338  off = 0;
1339  buf = GNUNET_malloc (plen);
1340  for (unsigned int i = 0; i < path_len; i++)
1341  {
1342  off += GNUNET_snprintf (&buf[off],
1343  plen - off,
1344  "%s%s",
1345  GNUNET_i2s (&path[i].pred),
1346  (i == path_len - 1) ? "" : "-");
1347  }
1348  return buf;
1349 }
static char buf[2048]
const char * GNUNET_i2s(const struct GNUNET_PeerIdentity *pid)
Convert a peer identity to a string (for printing debug messages).
int GNUNET_snprintf(char *buf, size_t size, const char *format,...) __attribute__((format(printf
Like snprintf, just aborts if the buffer is of insufficient size.

References buf, GNUNET_assert, GNUNET_i2s(), GNUNET_malloc, and GNUNET_snprintf().

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◆ GNUNET_DHT_verify_path()

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 last element of the get_path).

Note that the last signature on the path is never verified as that is the slot where our peer (me) would need to sign.

Parameters
datapayload (the block)
data_sizenumber of bytes in data
exp_timeexpiration time of data
trunc_peerpeer which signature was broken or where the path was truncated, NULL if path is not truncated
get_patharray of path elements to verify
get_path_lenlength of the get_path array
put_patharray of path elements to verify
put_path_lenlength of the put_path array
meour own peer identity (needed to verify the last element)
Returns
0 on success, otherwise the index of the last path element that succeeded with verification; get_path_len + put_path_len if no signature was valid

Definition at line 1353 of file dht_api.c.

1362 {
1363  static struct GNUNET_PeerIdentity zero;
1364  struct GNUNET_DHT_HopSignature hs = {
1366  .purpose.size = htonl (sizeof (hs)),
1367  .expiration_time = GNUNET_TIME_absolute_hton (exp_time)
1368  };
1369  unsigned int i;
1370 
1371  if (0 == get_path_len + put_path_len)
1372  return 0;
1374  "%s is verifying signatures with GPL: %u PPL: %u!\n",
1375  GNUNET_i2s (me),
1376  get_path_len,
1377  put_path_len);
1378  for (unsigned int j = 0; j<put_path_len; j++)
1380  "PP%u=%s\n",
1381  j,
1382  GNUNET_i2s (&put_path[j].pred));
1383  for (unsigned int j = 0; j<get_path_len; j++)
1385  "GP%u=%s\n",
1386  j,
1387  GNUNET_i2s (&get_path[j].pred));
1389  data_size,
1390  &hs.h_data);
1391  i = put_path_len + get_path_len;
1392  while (i > 0)
1393  {
1394  const struct GNUNET_PeerIdentity *pred;
1395  const struct GNUNET_PeerIdentity *succ;
1396  const struct GNUNET_DHT_PathElement *pe;
1397 
1398  i--;
1399  if (0 == i)
1400  {
1401  pred = (NULL == bpid) ? &zero : bpid;
1402  }
1403  else
1404  {
1405  unsigned int off = i - 1;
1406 
1407  pred = (off >= put_path_len)
1408  ? &get_path[off - put_path_len].pred
1409  : &put_path[off].pred;
1410  }
1411  if (i == get_path_len + put_path_len - 1)
1412  {
1413  succ = me;
1414  }
1415  else
1416  {
1417  unsigned int off = i + 1;
1418 
1419  succ = (off >= put_path_len)
1420  ? &get_path[off - put_path_len].pred
1421  : &put_path[off].pred;
1422  }
1423  hs.pred = *pred;
1424  hs.succ = *succ;
1425  pe = (i >= put_path_len)
1426  ? &get_path[i - put_path_len]
1427  : &put_path[i];
1428  if (GNUNET_OK !=
1431  &hs,
1432  &pe->sig,
1433  &pe->pred.public_key))
1434  {
1435  GNUNET_break_op (0);
1436  return i + 1;
1437  }
1438  }
1439  return i;
1440 }
#define GNUNET_SIGNATURE_PURPOSE_DHT_HOP
Signature by which a peer affirms that it forwarded a message in the DHT.
static size_t data_size
Number of bytes in data.
Definition: gnunet-abd.c:187
static GNUNET_NETWORK_STRUCT_END struct GNUNET_PeerIdentity me
Our own peer identity.
static const struct GNUNET_IDENTITY_PrivateKey zero
Public key of all zeros.
#define GNUNET_CRYPTO_eddsa_verify(purp, ps, sig, pub)
Verify EdDSA signature.
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_log(kind,...)
@ GNUNET_OK
Definition: gnunet_common.h:99
#define GNUNET_break_op(cond)
Use this for assertion violations caused by other peers (i.e.
uint32_t purpose
What does this signature vouch for? This must contain a GNUNET_SIGNATURE_PURPOSE_XXX constant (from g...
Message signed by a peer when doing path tracking.
struct GNUNET_HashCode h_data
Hash over the payload of the block.
struct GNUNET_CRYPTO_EccSignaturePurpose purpose
Must be GNUNET_SIGNATURE_PURPOSE_DHT_HOP.
struct GNUNET_PeerIdentity pred
Previous hop the message was received from.
struct GNUNET_PeerIdentity succ
Next hop the message was forwarded to.
A (signed) path tracking a block's flow through the DHT is represented by an array of path elements,...
struct GNUNET_PeerIdentity pred
Previous peer on the path (matches "pred" in the signed field).
struct GNUNET_CRYPTO_EddsaSignature sig
Signature affirming the hop of type GNUNET_SIGNATURE_PURPOSE_DHT_HOP.
The identity of the host (wraps the signing key of the peer).
struct GNUNET_CRYPTO_EddsaPublicKey public_key

References data, data_size, GNUNET_break_op, GNUNET_CRYPTO_eddsa_verify, GNUNET_CRYPTO_hash(), GNUNET_ERROR_TYPE_DEBUG, GNUNET_i2s(), GNUNET_log, GNUNET_OK, GNUNET_SIGNATURE_PURPOSE_DHT_HOP, GNUNET_TIME_absolute_hton(), GNUNET_DHT_HopSignature::h_data, me, GNUNET_DHT_PathElement::pred, GNUNET_DHT_HopSignature::pred, GNUNET_PeerIdentity::public_key, GNUNET_CRYPTO_EccSignaturePurpose::purpose, GNUNET_DHT_HopSignature::purpose, GNUNET_DHT_PathElement::sig, GNUNET_DHT_HopSignature::succ, and zero.

Referenced by check_dht_p2p_hello(), check_dht_p2p_put(), GDS_CLIENTS_handle_reply(), get_result_iterator(), and handle_dht_p2p_put().

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◆ GNUNET_DHT_hello_get()

struct GNUNET_DHT_HelloGetHandle* GNUNET_DHT_hello_get ( struct GNUNET_DHT_Handle dht_handle,
GNUNET_DHT_HelloGetCallback  cb,
void *  cb_cls 
)

Obtain HELLO URL of the DHT identified by dht_handle.

Parameters
dht_handleDHT to query
cbfunction to call with the result
cb_clsclosure for cb
Returns
NULL on failure

Definition at line 1444 of file dht_api.c.

1447 {
1448  struct GNUNET_DHT_HelloGetHandle *hgh;
1449  struct GNUNET_MessageHeader *hdr;
1450  struct GNUNET_MQ_Envelope *env;
1451 
1452  hgh = GNUNET_new (struct GNUNET_DHT_HelloGetHandle);
1453  hgh->cb = cb;
1454  hgh->cb_cls = cb_cls;
1455  hgh->dht_handle = dht_handle;
1457  dht_handle->hgh_tail,
1458  hgh);
1459  env = GNUNET_MQ_msg (hdr,
1462  env);
1463  return hgh;
1464 }
dht_handle
Definition: 018.c:1
#define GNUNET_MESSAGE_TYPE_DHT_CLIENT_HELLO_GET
Client requests DHT service's HELLO URL.
Handle to get a HELLO URL from the DHT for manual bootstrapping.
Definition: dht_api.c:203
struct GNUNET_DHT_Handle * dht_handle
Connection to the DHT service.
Definition: dht_api.c:228
GNUNET_DHT_HelloGetCallback cb
Function to call with the result.
Definition: dht_api.c:218
void * cb_cls
Closure for cb.
Definition: dht_api.c:223
Header for all communications.

References GNUNET_DHT_HelloGetHandle::cb, GNUNET_DHT_HelloGetHandle::cb_cls, dht_handle, GNUNET_DHT_HelloGetHandle::dht_handle, env, GNUNET_CONTAINER_DLL_insert, GNUNET_MESSAGE_TYPE_DHT_CLIENT_HELLO_GET, GNUNET_MQ_msg, GNUNET_MQ_send(), and GNUNET_new.

Referenced by run().

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◆ GNUNET_DHT_hello_get_cancel()

void GNUNET_DHT_hello_get_cancel ( struct GNUNET_DHT_HelloGetHandle hgh)

Cancel hello get operation.

Parameters
[in]hghoperation to cancel.

Definition at line 1468 of file dht_api.c.

1469 {
1470  struct GNUNET_DHT_Handle *dht_handle = hgh->dht_handle;
1471 
1473  dht_handle->hgh_tail,
1474  hgh);
1475  GNUNET_free (hgh);
1476 }

References dht_handle, GNUNET_DHT_HelloGetHandle::dht_handle, GNUNET_CONTAINER_DLL_remove, and GNUNET_free.

Referenced by cleanup_task(), and handle_client_hello().

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◆ GNUNET_DHT_hello_offer()

void GNUNET_DHT_hello_offer ( struct GNUNET_DHT_Handle dht_handle,
const char *  url,
GNUNET_SCHEDULER_TaskCallback  cb,
void *  cb_cls 
)

Offer HELLO URL of the DHT identified by dht_handle.

Callback may be invoked once, only way to cancel is to disconnect dht_handle.

Parameters
dht_handleDHT to query
urlURL with a HELLO to offer to the DHT
cbfunction called when done
cb_clsclosure for cb

Definition at line 1480 of file dht_api.c.

1484 {
1485  struct GNUNET_MessageHeader *hdr;
1486  size_t slen = strlen (url) + 1;
1487  struct GNUNET_MQ_Envelope *env;
1488 
1489  env = GNUNET_MQ_msg_extra (hdr,
1490  slen,
1492  memcpy (&hdr[1],
1493  url,
1494  slen);
1496  cb,
1497  cb_cls);
1499  env);
1500 }
#define GNUNET_MESSAGE_TYPE_DHT_CLIENT_HELLO_URL
HELLO URL send between client and service (in either direction).

References dht_handle, env, GNUNET_MESSAGE_TYPE_DHT_CLIENT_HELLO_URL, GNUNET_MQ_msg_extra, GNUNET_MQ_notify_sent(), and GNUNET_MQ_send().

Referenced by run().

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