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