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#ifndef __ASSOC_H__
#define __ASSOC_H__
/* used by rendezvous */
#define ASSOC_AVAILABLE
/* For the legalese parts, see tox.h. */
/* enumerated lists are superior to magic numbers */
enum NODE_STATUS { BAD, SEENB_HEARDG, SEENG, USED };
/*
* Module to store currently unused ID <=> IP associations
* for a potential future use
*/
typedef struct Assoc Assoc;
/*****************************************************************************/
/* custom distance handler, if it's not ID-distance based
* return values exactly like id_closest() */
typedef int (*Assoc_distance_relative_callback)(const Assoc *assoc, void *callback_data, const uint8_t *client_id,
const uint8_t *client_id1, const uint8_t *client_id2);
#define DISTANCE_INDEX_DISTANCE_BITS 44
/* absolute distance: can be same for different client_id_check values
* return value should have DISTANCE_INDEX_DISTANCE_BITS valid bits */
typedef uint64_t (*Assoc_distance_absolute_callback)(const Assoc *assoc, void *callback_data,
const uint8_t *client_id_ref, const uint8_t *client_id_check);
/*****************************************************************************/
/* Central entry point for new associations: add a new candidate to the cache
* returns 1 if entry is stored, 2 if existing entry was updated, 0 else */
uint8_t Assoc_add_entry(Assoc *assoc, const uint8_t *id, const IPPTs *ippts_send, const IP_Port *ipp_recv,
uint8_t used);
/*****************************************************************************/
typedef enum AssocCloseEntriesFlags {
ProtoIPv4 = 1,
ProtoIPv6 = 2,
LANOk = 4,
} AssocCloseEntriesFlags;
typedef struct Assoc_close_entries {
void *custom_data; /* given to distance functions */
uint8_t *wanted_id; /* the target client_id */
uint8_t flags; /* additional flags */
Assoc_distance_relative_callback distance_relative_func;
Assoc_distance_absolute_callback distance_absolute_func;
uint8_t count_good; /* that many should be "good" w.r.t. timeout */
uint8_t count; /* allocated number of close_indices */
Client_data **result;
} Assoc_close_entries;
/* find up to close_count nodes to put into close_nodes_used of ID_Nodes
* the distance functions can be NULL, then standard distance functions will be used
* the caller is responsible for allocating close_indices of sufficient size
*
* returns 0 on error
* returns the number of found nodes and the list of indices usable by Assoc_client()
* the caller is assumed to be registered from Assoc_register_callback()
* if they aren't, they should copy the Client_data and call Assoc_client_drop()
*/
uint8_t Assoc_get_close_entries(Assoc *assoc, Assoc_close_entries *close_entries);
/*****************************************************************************/
/* create: default sizes (6, 5 => 320 entries) */
Assoc *new_Assoc_default(const uint8_t *public_id);
/* create: customized sizes
* total is (2^bits) * entries
* bits should be between 2 and 15 (else it's trimmed)
* entries will be reduced to the closest prime smaller or equal
*
* preferably bits should be large and entries small to ensure spread
* in the search space (e. g. 5, 5 is preferable to 2, 41) */
Assoc *new_Assoc(size_t bits, size_t entries, const uint8_t *public_id);
/* public_id changed (loaded), update which entry isn't stored */
void Assoc_self_client_id_changed(Assoc *assoc, const uint8_t *public_id);
/* every 45s send out a getnodes() for a "random" bucket */
#define ASSOC_BUCKET_REFRESH 45
/* refresh bucket's data from time to time
* this must be called only from DHT */
void do_Assoc(Assoc *assoc, DHT *dht);
/* destroy */
void kill_Assoc(Assoc *assoc);
#ifdef LOGGING
void Assoc_status(const Assoc *assoc);
#endif /* LOGGING */
#endif /* !__ASSOC_H__ */
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