81 lines
3.0 KiB
C
81 lines
3.0 KiB
C
/* Copyright (c) 2015, The Tor Project, Inc. */
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/* See LICENSE for licensing information */
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/**
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* \file rendcache.h
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* \brief Header file for rendcache.c
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**/
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#ifndef TOR_RENDCACHE_H
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#define TOR_RENDCACHE_H
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#include "or.h"
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#include "rendcommon.h"
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/** How old do we let hidden service descriptors get before discarding
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* them as too old? */
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#define REND_CACHE_MAX_AGE (2*24*60*60)
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/** How wrong do we assume our clock may be when checking whether hidden
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* services are too old or too new? */
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#define REND_CACHE_MAX_SKEW (24*60*60)
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/** How old do we keep an intro point failure entry in the failure cache? */
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#define REND_CACHE_FAILURE_MAX_AGE (5*60)
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/* Do not allow more than this many introduction points in a hidden service
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* descriptor */
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#define MAX_INTRO_POINTS 10
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/** A cached rendezvous descriptor. */
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typedef struct rend_cache_entry_t {
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size_t len; /**< Length of <b>desc</b> */
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time_t last_served; /**< When did we last write this one to somebody?
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* (HSDir only) */
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char *desc; /**< Service descriptor */
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rend_service_descriptor_t *parsed; /**< Parsed value of 'desc' */
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} rend_cache_entry_t;
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/* Introduction point failure type. */
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typedef struct rend_cache_failure_intro_t {
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/* When this intro point failure occured thus we allocated this object and
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* cache it. */
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time_t created_ts;
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rend_intro_point_failure_t failure_type;
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} rend_cache_failure_intro_t;
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/** Cache failure object indexed by service ID. */
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typedef struct rend_cache_failure_t {
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/* Contains rend_cache_failure_intro_t indexed by identity digest. */
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digestmap_t *intro_failures;
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} rend_cache_failure_t;
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void rend_cache_init(void);
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void rend_cache_clean(time_t now);
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void rend_cache_failure_clean(time_t now);
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void rend_cache_clean_v2_descs_as_dir(time_t now, size_t min_to_remove);
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void rend_cache_purge(void);
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void rend_cache_free_all(void);
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int rend_cache_lookup_entry(const char *query, int version,
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rend_cache_entry_t **entry_out);
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int rend_cache_lookup_v2_desc_as_dir(const char *query, const char **desc);
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/** Return value from rend_cache_store_v2_desc_as_{dir,client}. */
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typedef enum {
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RCS_NOTDIR = -2, /**< We're not a directory */
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RCS_BADDESC = -1, /**< This descriptor is no good. */
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RCS_OKAY = 0 /**< All worked as expected */
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} rend_cache_store_status_t;
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rend_cache_store_status_t rend_cache_store_v2_desc_as_dir(const char *desc);
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rend_cache_store_status_t rend_cache_store_v2_desc_as_client(const char *desc,
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const char *desc_id_base32,
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const rend_data_t *rend_query,
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rend_cache_entry_t **entry);
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size_t rend_cache_get_total_allocation(void);
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void rend_cache_intro_failure_note(rend_intro_point_failure_t failure,
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const uint8_t *identity,
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const char *service_id);
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void rend_cache_failure_purge(void);
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#endif /* TOR_RENDCACHE_H */
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