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https://gitlab.torproject.org/tpo/core/tor.git
synced 2024-11-24 20:33:31 +01:00
Separate lookup function for service rend cache
Performing lookups in both the client and service side descriptor caches from the same rend_cache_lookup_entry() function increases the risk of accidental API misuse. I'm separating the lookup functions to keep the caches distinct.
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61ef356ab3
commit
d47a4aec66
@ -1527,8 +1527,7 @@ connection_ap_handshake_rewrite_and_attach(entry_connection_t *conn,
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unsigned int refetch_desc = 0;
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rend_cache_entry_t *entry = NULL;
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const int rend_cache_lookup_result =
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rend_cache_lookup_entry(rend_data->onion_address, -1, &entry,
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REND_CACHE_TYPE_CLIENT);
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rend_cache_lookup_entry(rend_data->onion_address, -1, &entry);
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if (rend_cache_lookup_result < 0) {
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switch (-rend_cache_lookup_result) {
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case EINVAL:
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@ -1920,7 +1920,7 @@ getinfo_helper_dir(control_connection_t *control_conn,
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return -1;
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}
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if (!rend_cache_lookup_entry(question, -1, &e, REND_CACHE_TYPE_CLIENT)) {
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if (!rend_cache_lookup_entry(question, -1, &e)) {
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/* Descriptor found in cache */
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*answer = tor_strdup(e->desc);
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} else {
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@ -1936,7 +1936,7 @@ getinfo_helper_dir(control_connection_t *control_conn,
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return -1;
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}
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if (!rend_cache_lookup_entry(question, -1, &e, REND_CACHE_TYPE_SERVICE)) {
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if (!rend_cache_lookup_v2_desc_as_service(question, &e)) {
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/* Descriptor found in cache */
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*answer = tor_strdup(e->desc);
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} else {
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@ -480,27 +480,23 @@ rend_cache_clean_v2_descs_as_dir(time_t now, size_t force_remove)
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} while (bytes_removed < force_remove);
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}
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/** Lookup in the client or service cache the given service ID <b>query</b> for
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* <b>version</b>. The <b>service</b> argument determines if the lookup should
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* be from the client cache or the service cache.
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/** Lookup in the client cache the given service ID <b>query</b> for
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* <b>version</b>.
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*
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* Return 0 if found and if <b>e</b> is non NULL, set it with the entry
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* found. Else, a negative value is returned and <b>e</b> is untouched.
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* -EINVAL means that <b>query</b> is not a valid service id.
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* -ENOENT means that no entry in the cache was found. */
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int
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rend_cache_lookup_entry(const char *query, int version, rend_cache_entry_t **e,
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rend_cache_type_t cache)
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rend_cache_lookup_entry(const char *query, int version, rend_cache_entry_t **e)
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{
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int ret = 0;
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char key[REND_SERVICE_ID_LEN_BASE32 + 2]; /* <version><query>\0 */
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rend_cache_entry_t *entry = NULL;
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static const int default_version = 2;
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tor_assert(rend_cache_local_service);
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tor_assert(rend_cache);
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tor_assert(query);
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tor_assert(cache);
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if (!rend_valid_service_id(query)) {
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ret = -EINVAL;
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@ -514,21 +510,50 @@ rend_cache_lookup_entry(const char *query, int version, rend_cache_entry_t **e,
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case 2:
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/* Default is version 2. */
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default:
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if(cache == REND_CACHE_TYPE_SERVICE){
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entry = strmap_get_lc(rend_cache_local_service, query);
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} else if (cache == REND_CACHE_TYPE_CLIENT) {
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tor_snprintf(key, sizeof(key), "%d%s", default_version, query);
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entry = strmap_get_lc(rend_cache, key);
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}
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tor_snprintf(key, sizeof(key), "%d%s", default_version, query);
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entry = strmap_get_lc(rend_cache, key);
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break;
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}
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if (!entry) {
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ret = -ENOENT;
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goto end;
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}
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/* Check descriptor is parsed only if lookup is from client cache */
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if(cache == REND_CACHE_TYPE_CLIENT){
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tor_assert(entry->parsed && entry->parsed->intro_nodes);
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tor_assert(entry->parsed && entry->parsed->intro_nodes);
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if (e) {
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*e = entry;
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}
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end:
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return ret;
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}
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/*
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* Lookup the v2 service descriptor with the service ID <b>query</b> in the
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* local service descriptor cache. Return 0 if found and if <b>e</b> is
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* non NULL, set it with the entry found. Else, a negative value is returned
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* and <b>e</b> is untouched.
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* -EINVAL means that <b>query</b> is not a valid service id.
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* -ENOENT means that no entry in the cache was found. */
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int
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rend_cache_lookup_v2_desc_as_service(const char *query, rend_cache_entry_t **e)
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{
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int ret = 0;
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rend_cache_entry_t *entry = NULL;
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tor_assert(rend_cache_local_service);
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tor_assert(query);
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if (!rend_valid_service_id(query)) {
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ret = -EINVAL;
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goto end;
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}
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/* Lookup descriptor and return. */
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entry = strmap_get_lc(rend_cache_local_service, query);
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if (!entry) {
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ret = -ENOENT;
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goto end;
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}
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if (e) {
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@ -60,8 +60,9 @@ 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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rend_cache_type_t cache);
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rend_cache_entry_t **entry_out);
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int rend_cache_lookup_v2_desc_as_service(const char *query,
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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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@ -160,7 +160,7 @@ rend_client_send_introduction(origin_circuit_t *introcirc,
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#endif
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r = rend_cache_lookup_entry(introcirc->rend_data->onion_address, -1,
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&entry, REND_CACHE_TYPE_CLIENT);
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&entry);
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/* An invalid onion address is not possible else we have a big issue. */
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tor_assert(r != -EINVAL);
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if (r < 0 || !rend_client_any_intro_points_usable(entry)) {
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@ -906,8 +906,7 @@ rend_client_refetch_v2_renddesc(rend_data_t *rend_query)
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return;
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}
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/* Before fetching, check if we already have a usable descriptor here. */
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if (rend_cache_lookup_entry(rend_query->onion_address, -1, &e,
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REND_CACHE_TYPE_CLIENT) == 0 &&
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if (rend_cache_lookup_entry(rend_query->onion_address, -1, &e) == 0 &&
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rend_client_any_intro_points_usable(e)) {
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log_info(LD_REND, "We would fetch a v2 rendezvous descriptor, but we "
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"already have a usable descriptor here. Not fetching.");
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@ -988,8 +987,7 @@ rend_client_report_intro_point_failure(extend_info_t *failed_intro,
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rend_cache_entry_t *ent;
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connection_t *conn;
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r = rend_cache_lookup_entry(rend_query->onion_address, -1, &ent,
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REND_CACHE_TYPE_CLIENT);
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r = rend_cache_lookup_entry(rend_query->onion_address, -1, &ent);
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if (r < 0) {
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/* Either invalid onion address or cache entry not found. */
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switch (-r) {
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@ -1215,7 +1213,7 @@ rend_client_desc_trynow(const char *query)
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continue;
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assert_connection_ok(base_conn, now);
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if (rend_cache_lookup_entry(rend_data->onion_address, -1,
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&entry, REND_CACHE_TYPE_CLIENT) == 0 &&
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&entry) == 0 &&
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rend_client_any_intro_points_usable(entry)) {
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/* either this fetch worked, or it failed but there was a
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* valid entry from before which we should reuse */
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@ -1258,7 +1256,7 @@ rend_client_note_connection_attempt_ended(const rend_data_t *rend_data)
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if (*rend_data->onion_address != '\0') {
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/* Ignore return value; we find an entry, or we don't. */
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(void) rend_cache_lookup_entry(rend_data->onion_address, -1,
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&cache_entry, 0);
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&cache_entry);
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have_onion = 1;
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}
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@ -1297,8 +1295,7 @@ rend_client_get_random_intro(const rend_data_t *rend_query)
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extend_info_t *result;
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rend_cache_entry_t *entry;
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ret = rend_cache_lookup_entry(rend_query->onion_address, -1, &entry,
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REND_CACHE_TYPE_CLIENT);
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ret = rend_cache_lookup_entry(rend_query->onion_address, -1, &entry);
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if (ret < 0 || !rend_client_any_intro_points_usable(entry)) {
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log_warn(LD_REND,
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"Query '%s' didn't have valid rend desc in cache. Failing.",
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