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-rw-r--r--src/or/fp_pair.c315
1 files changed, 0 insertions, 315 deletions
diff --git a/src/or/fp_pair.c b/src/or/fp_pair.c
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--- a/src/or/fp_pair.c
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-/* Copyright (c) 2013-2018, The Tor Project, Inc. */
-/* See LICENSE for licensing information */
-
-/**
- * \file fp_pair.c
- *
- * \brief Manages data structures for associating pairs of fingerprints. Used
- * to handle combinations of identity/signing-key fingerprints for
- * authorities.
- *
- * This is a nice, simple, compact data structure module that handles a map
- * from (signing key fingerprint, identity key fingerprint) to void *. The
- * fingerprints here are SHA1 digests of RSA keys.
- *
- * This structure is used in directory.c and in routerlist.c for handling
- * handling authority certificates, since we never want more than a single
- * certificate for any (ID key, signing key) pair.
- **/
-
-#include "or/or.h"
-#include "or/fp_pair.h"
-
-/* Define fp_pair_map_t structures */
-
-struct fp_pair_map_entry_s {
- HT_ENTRY(fp_pair_map_entry_s) node;
- void *val;
- fp_pair_t key;
-};
-
-struct fp_pair_map_s {
- HT_HEAD(fp_pair_map_impl, fp_pair_map_entry_s) head;
-};
-
-/*
- * Hash function and equality checker for fp_pair_map_t
- */
-
-/** Compare fp_pair_entry_t objects by key value. */
-static inline int
-fp_pair_map_entries_eq(const fp_pair_map_entry_t *a,
- const fp_pair_map_entry_t *b)
-{
- return tor_memeq(&(a->key), &(b->key), sizeof(fp_pair_t));
-}
-
-/** Return a hash value for an fp_pair_entry_t. */
-static inline unsigned int
-fp_pair_map_entry_hash(const fp_pair_map_entry_t *a)
-{
- tor_assert(sizeof(a->key) == DIGEST_LEN*2);
- return (unsigned) siphash24g(&a->key, DIGEST_LEN*2);
-}
-
-/*
- * Hash table functions for fp_pair_map_t
- */
-
-HT_PROTOTYPE(fp_pair_map_impl, fp_pair_map_entry_s, node,
- fp_pair_map_entry_hash, fp_pair_map_entries_eq)
-HT_GENERATE2(fp_pair_map_impl, fp_pair_map_entry_s, node,
- fp_pair_map_entry_hash, fp_pair_map_entries_eq,
- 0.6, tor_reallocarray_, tor_free_)
-
-/** Constructor to create a new empty map from fp_pair_t to void *
- */
-
-fp_pair_map_t *
-fp_pair_map_new(void)
-{
- fp_pair_map_t *result;
-
- result = tor_malloc(sizeof(fp_pair_map_t));
- HT_INIT(fp_pair_map_impl, &result->head);
- return result;
-}
-
-/** Set the current value for key to val; returns the previous
- * value for key if one was set, or NULL if one was not.
- */
-
-void *
-fp_pair_map_set(fp_pair_map_t *map, const fp_pair_t *key, void *val)
-{
- fp_pair_map_entry_t *resolve;
- fp_pair_map_entry_t search;
- void *oldval;
-
- tor_assert(map);
- tor_assert(key);
- tor_assert(val);
-
- memcpy(&(search.key), key, sizeof(*key));
- resolve = HT_FIND(fp_pair_map_impl, &(map->head), &search);
- if (resolve) {
- oldval = resolve->val;
- resolve->val = val;
- } else {
- resolve = tor_malloc_zero(sizeof(fp_pair_map_entry_t));
- memcpy(&(resolve->key), key, sizeof(*key));
- resolve->val = val;
- HT_INSERT(fp_pair_map_impl, &(map->head), resolve);
- oldval = NULL;
- }
-
- return oldval;
-}
-
-/** Set the current value for the key (first, second) to val; returns
- * the previous value for key if one was set, or NULL if one was not.
- */
-
-void *
-fp_pair_map_set_by_digests(fp_pair_map_t *map,
- const char *first, const char *second,
- void *val)
-{
- fp_pair_t k;
-
- tor_assert(first);
- tor_assert(second);
-
- memcpy(k.first, first, DIGEST_LEN);
- memcpy(k.second, second, DIGEST_LEN);
-
- return fp_pair_map_set(map, &k, val);
-}
-
-/** Return the current value associated with key, or NULL if no value is set.
- */
-
-void *
-fp_pair_map_get(const fp_pair_map_t *map, const fp_pair_t *key)
-{
- fp_pair_map_entry_t *resolve;
- fp_pair_map_entry_t search;
- void *val = NULL;
-
- tor_assert(map);
- tor_assert(key);
-
- memcpy(&(search.key), key, sizeof(*key));
- resolve = HT_FIND(fp_pair_map_impl, &(map->head), &search);
- if (resolve) val = resolve->val;
-
- return val;
-}
-
-/** Return the current value associated the key (first, second), or
- * NULL if no value is set.
- */
-
-void *
-fp_pair_map_get_by_digests(const fp_pair_map_t *map,
- const char *first, const char *second)
-{
- fp_pair_t k;
-
- tor_assert(first);
- tor_assert(second);
-
- memcpy(k.first, first, DIGEST_LEN);
- memcpy(k.second, second, DIGEST_LEN);
-
- return fp_pair_map_get(map, &k);
-}
-
-/** Remove the value currently associated with key from the map.
- * Return the value if one was set, or NULL if there was no entry for
- * key. The caller must free any storage associated with the
- * returned value.
- */
-
-void *
-fp_pair_map_remove(fp_pair_map_t *map, const fp_pair_t *key)
-{
- fp_pair_map_entry_t *resolve;
- fp_pair_map_entry_t search;
- void *val = NULL;
-
- tor_assert(map);
- tor_assert(key);
-
- memcpy(&(search.key), key, sizeof(*key));
- resolve = HT_REMOVE(fp_pair_map_impl, &(map->head), &search);
- if (resolve) {
- val = resolve->val;
- tor_free(resolve);
- }
-
- return val;
-}
-
-/** Remove all entries from map, and deallocate storage for those entries.
- * If free_val is provided, it is invoked on every value in map.
- */
-
-void
-fp_pair_map_free_(fp_pair_map_t *map, void (*free_val)(void*))
-{
- fp_pair_map_entry_t **ent, **next, *this;
-
- if (map) {
- for (ent = HT_START(fp_pair_map_impl, &(map->head));
- ent != NULL; ent = next) {
- this = *ent;
- next = HT_NEXT_RMV(fp_pair_map_impl, &(map->head), ent);
- if (free_val) free_val(this->val);
- tor_free(this);
- }
- tor_assert(HT_EMPTY(&(map->head)));
- HT_CLEAR(fp_pair_map_impl, &(map->head));
- tor_free(map);
- }
-}
-
-/** Return true iff map has no entries.
- */
-
-int
-fp_pair_map_isempty(const fp_pair_map_t *map)
-{
- tor_assert(map);
-
- return HT_EMPTY(&(map->head));
-}
-
-/** Return the number of items in map.
- */
-
-int
-fp_pair_map_size(const fp_pair_map_t *map)
-{
- tor_assert(map);
-
- return HT_SIZE(&(map->head));
-}
-
-/** return an iterator pointing to the start of map.
- */
-
-fp_pair_map_iter_t *
-fp_pair_map_iter_init(fp_pair_map_t *map)
-{
- tor_assert(map);
-
- return HT_START(fp_pair_map_impl, &(map->head));
-}
-
-/** Advance iter a single step to the next entry of map, and return
- * its new value.
- */
-
-fp_pair_map_iter_t *
-fp_pair_map_iter_next(fp_pair_map_t *map, fp_pair_map_iter_t *iter)
-{
- tor_assert(map);
- tor_assert(iter);
-
- return HT_NEXT(fp_pair_map_impl, &(map->head), iter);
-}
-
-/** Advance iter a single step to the next entry of map, removing the current
- * entry, and return its new value.
- */
-
-fp_pair_map_iter_t *
-fp_pair_map_iter_next_rmv(fp_pair_map_t *map, fp_pair_map_iter_t *iter)
-{
- fp_pair_map_entry_t *rmv;
-
- tor_assert(map);
- tor_assert(iter);
- tor_assert(*iter);
-
- rmv = *iter;
- iter = HT_NEXT_RMV(fp_pair_map_impl, &(map->head), iter);
- tor_free(rmv);
-
- return iter;
-}
-
-/** Set *key_out and *val_out to the current entry pointed to by iter.
- */
-
-void
-fp_pair_map_iter_get(fp_pair_map_iter_t *iter,
- fp_pair_t *key_out, void **val_out)
-{
- tor_assert(iter);
- tor_assert(*iter);
-
- if (key_out) memcpy(key_out, &((*iter)->key), sizeof(fp_pair_t));
- if (val_out) *val_out = (*iter)->val;
-}
-
-/** Return true iff iter has advanced past the last entry of its map.
- */
-
-int
-fp_pair_map_iter_done(fp_pair_map_iter_t *iter)
-{
- return (iter == NULL);
-}
-
-/** Assert if anything has gone wrong with the internal
- * representation of map.
- */
-
-void
-fp_pair_map_assert_ok(const fp_pair_map_t *map)
-{
- tor_assert(!fp_pair_map_impl_HT_REP_IS_BAD_(&(map->head)));
-}
-