STATIC int
replaycache_add_and_test_internal(
time_t present, replaycache_t *r, const void *data, size_t len,
time_t *elapsed)
{
int rv = 0;
uint8_t digest[DIGEST256_LEN];
time_t *access_time;
/* sanity check */
if (present <= 0 || !r || !data || len == 0) {
log_info(LD_BUG, "replaycache_add_and_test_internal() called with stupid"
" parameters; please fix this.");
goto done;
}
/* compute digest */
crypto_digest256((char *)digest, (const char *)data, len, DIGEST_SHA256);
/* check map */
access_time = digest256map_get(r->digests_seen, digest);
/* seen before? */
if (access_time != NULL) {
/*
* If it's far enough in the past, no hit. If the horizon is zero, we
* never expire.
*/
if (*access_time >= present - r->horizon || r->horizon == 0) {
/* replay cache hit, return 1 */
rv = 1;
/* If we want to output an elapsed time, do so */
if (elapsed) {
if (present >= *access_time) {
*elapsed = present - *access_time;
} else {
/* We shouldn't really be seeing hits from the future, but... */
*elapsed = 0;
}
}
}
/*
* If it's ahead of the cached time, update
*/
if (*access_time < present) {
*access_time = present;
}
} else {
/* No, so no hit and update the digest map with the current time */
access_time = tor_malloc(sizeof(*access_time));
*access_time = present;
digest256map_set(r->digests_seen, digest, access_time);
}
/* now scrub the cache if it's time */
replaycache_scrub_if_needed_internal(present, r);
done:
return rv;
}
/* Query our cache and return the entry or NULL if not found. */
static hs_cache_dir_descriptor_t *
lookup_v3_desc_as_dir(const uint8_t *key)
{
tor_assert(key);
return digest256map_get(hs_cache_v3_dir, key);
}
