2  *  SSL session cache implementation
35 void mbedtls_ssl_cache_init(mbedtls_ssl_cache_context *cache)  in mbedtls_ssl_cache_init()  argument
37     memset(cache, 0, sizeof(mbedtls_ssl_cache_context));  in mbedtls_ssl_cache_init()
39     cache->timeout = MBEDTLS_SSL_CACHE_DEFAULT_TIMEOUT;  in mbedtls_ssl_cache_init()
40     cache->max_entries = MBEDTLS_SSL_CACHE_DEFAULT_MAX_ENTRIES;  in mbedtls_ssl_cache_init()
43     mbedtls_mutex_init(&cache->mutex);  in mbedtls_ssl_cache_init()
48 static int ssl_cache_find_entry(mbedtls_ssl_cache_context *cache,  in ssl_cache_find_entry()  argument
59     for (cur = cache->chain; cur != NULL; cur = cur->next) {  in ssl_cache_find_entry()
61         if (cache->timeout != 0 &&  in ssl_cache_find_entry()
62             (int) (t - cur->timestamp) > cache->timeout) {  in ssl_cache_find_entry()
91     mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;  in mbedtls_ssl_cache_get()  local
95     if ((ret = mbedtls_mutex_lock(&cache->mutex)) != 0) {  in mbedtls_ssl_cache_get()
100     ret = ssl_cache_find_entry(cache, session_id, session_id_len, &entry);  in mbedtls_ssl_cache_get()
116     if (mbedtls_mutex_unlock(&cache->mutex) != 0) {  in mbedtls_ssl_cache_get()
124 /* zeroize a cache entry */
142 static int ssl_cache_pick_writing_slot(mbedtls_ssl_cache_context *cache,  in ssl_cache_pick_writing_slot()  argument
159      * If not, `count` will hold the size of the session cache  in ssl_cache_pick_writing_slot()
164     for (cur = cache->chain; cur != NULL; cur = cur->next) {  in ssl_cache_pick_writing_slot()
173     /* Check 2: Is there an outdated entry in the cache?  in ssl_cache_pick_writing_slot()
181     for (cur = cache->chain; cur != NULL; cur = cur->next) {  in ssl_cache_pick_writing_slot()
182         if (cache->timeout != 0 &&  in ssl_cache_pick_writing_slot()
183             (int) (t - cur->timestamp) > cache->timeout) {  in ssl_cache_pick_writing_slot()
194     /* Check 3: Is there free space in the cache? */  in ssl_cache_pick_writing_slot()
196     if (count < cache->max_entries) {  in ssl_cache_pick_writing_slot()
205             cache->chain = cur;  in ssl_cache_pick_writing_slot()
213     /* Last resort: The cache is full and doesn't contain any outdated  in ssl_cache_pick_writing_slot()
215      * (if present) or cache-order. */  in ssl_cache_pick_writing_slot()
219         /* This should only happen on an ill-configured cache  in ssl_cache_pick_writing_slot()
225     if (cache->chain == NULL) {  in ssl_cache_pick_writing_slot()
229     old = cache->chain;  in ssl_cache_pick_writing_slot()
230     cache->chain = old->next;  in ssl_cache_pick_writing_slot()
263     mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;  in mbedtls_ssl_cache_set()  local
270     if ((ret = mbedtls_mutex_lock(&cache->mutex)) != 0) {  in mbedtls_ssl_cache_set()
275     ret = ssl_cache_pick_writing_slot(cache,  in mbedtls_ssl_cache_set()
320     if (mbedtls_mutex_unlock(&cache->mutex) != 0) {  in mbedtls_ssl_cache_set()
339     mbedtls_ssl_cache_context *cache = (mbedtls_ssl_cache_context *) data;  in mbedtls_ssl_cache_remove()  local
344     if ((ret = mbedtls_mutex_lock(&cache->mutex)) != 0) {  in mbedtls_ssl_cache_remove()
349     ret = ssl_cache_find_entry(cache, session_id, session_id_len, &entry);  in mbedtls_ssl_cache_remove()
357     if (entry == cache->chain) {  in mbedtls_ssl_cache_remove()
358         cache->chain = entry->next;  in mbedtls_ssl_cache_remove()
361     for (prev = cache->chain; prev->next != NULL; prev = prev->next) {  in mbedtls_ssl_cache_remove()
375     if (mbedtls_mutex_unlock(&cache->mutex) != 0) {  in mbedtls_ssl_cache_remove()
384 void mbedtls_ssl_cache_set_timeout(mbedtls_ssl_cache_context *cache, int timeout)  in mbedtls_ssl_cache_set_timeout()  argument
390     cache->timeout = timeout;  in mbedtls_ssl_cache_set_timeout()
394 void mbedtls_ssl_cache_set_max_entries(mbedtls_ssl_cache_context *cache, int max)  in mbedtls_ssl_cache_set_max_entries()  argument
400     cache->max_entries = max;  in mbedtls_ssl_cache_set_max_entries()
403 void mbedtls_ssl_cache_free(mbedtls_ssl_cache_context *cache)  in mbedtls_ssl_cache_free()  argument
407     cur = cache->chain;  in mbedtls_ssl_cache_free()
418     mbedtls_mutex_free(&cache->mutex);  in mbedtls_ssl_cache_free()
420     cache->chain = NULL;  in mbedtls_ssl_cache_free()