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ab9a0e3407
When fetching a descriptor, we know test every introduction points in it against our rend failure cache to know if we keep it or not. For this to work, now everytime an introduction points is discareded (ex: receiving a NACK), we note it down in our introduction cache. See rendcache.c for a detailed explanation of the cache's behavior. Fixes #16389 Signed-off-by: David Goulet <dgoulet@ev0ke.net>
74 lines
2.6 KiB
C
74 lines
2.6 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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/* 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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unsigned int 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_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(unsigned int failure,
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const uint8_t *identity,
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const char *service_id);
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#endif /* TOR_RENDCACHE_H */
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