Latest update

crypto/property/defn_cache.c

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+/*
+ * Copyright 2019 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright (c) 2019, Oracle and/or its affiliates.  All rights reserved.
+ *
+ * Licensed under the Apache License 2.0 (the "License").  You may not use
+ * this file except in compliance with the License.  You can obtain a copy
+ * in the file LICENSE in the source distribution or at
+ * https://www.openssl.org/source/license.html
+ */
+
+#include <string.h>
+#include <openssl/err.h>
+#include <openssl/lhash.h>
+#include "internal/propertyerr.h"
+#include "internal/property.h"
+#include "property_lcl.h"
+
+/*
+ * Implement a property definition cache.
+ * These functions assume that they are called under a write lock.
+ * No attempt is made to clean out the cache, except when it is shut down.
+ */
+
+typedef struct {
+    const char *prop;
+    OSSL_PROPERTY_LIST *defn;
+    char body[1];
+} PROPERTY_DEFN_ELEM;
+
+DEFINE_LHASH_OF(PROPERTY_DEFN_ELEM);
+
+static LHASH_OF(PROPERTY_DEFN_ELEM) *property_defns = NULL;
+
+static unsigned long property_defn_hash(const PROPERTY_DEFN_ELEM *a)
+{
+    return OPENSSL_LH_strhash(a->prop);
+}
+
+static int property_defn_cmp(const PROPERTY_DEFN_ELEM *a,
+                             const PROPERTY_DEFN_ELEM *b)
+{
+    return strcmp(a->prop, b->prop);
+}
+
+static void property_defn_free(PROPERTY_DEFN_ELEM *elem)
+{
+    ossl_property_free(elem->defn);
+    OPENSSL_free(elem);
+}
+
+int ossl_prop_defn_init(void)
+{
+    property_defns = lh_PROPERTY_DEFN_ELEM_new(&property_defn_hash,
+                                               &property_defn_cmp);
+    return property_defns != NULL;
+}
+
+void ossl_prop_defn_cleanup(void)
+{
+    if (property_defns != NULL) {
+        lh_PROPERTY_DEFN_ELEM_doall(property_defns, &property_defn_free);
+        lh_PROPERTY_DEFN_ELEM_free(property_defns);
+        property_defns = NULL;
+    }
+}
+
+OSSL_PROPERTY_LIST *ossl_prop_defn_get(const char *prop)
+{
+    PROPERTY_DEFN_ELEM elem, *r;
+
+    elem.prop = prop;
+    r = lh_PROPERTY_DEFN_ELEM_retrieve(property_defns, &elem);
+    return r != NULL ? r->defn : NULL;
+}
+
+int ossl_prop_defn_set(const char *prop, OSSL_PROPERTY_LIST *pl)
+{
+    PROPERTY_DEFN_ELEM elem, *old, *p = NULL;
+    size_t len;
+
+    if (prop == NULL)
+        return 1;
+
+    if (pl == NULL) {
+        elem.prop = prop;
+        lh_PROPERTY_DEFN_ELEM_delete(property_defns, &elem);
+        return 1;
+    }
+    len = strlen(prop);
+    p = OPENSSL_malloc(sizeof(*p) + len);
+    if (p != NULL) {
+        p->prop = p->body;
+        p->defn = pl;
+        memcpy(p->body, prop, len + 1);
+        old = lh_PROPERTY_DEFN_ELEM_insert(property_defns, p);
+        if (old != NULL) {
+            property_defn_free(old);
+            return 1;
+        }
+        if (!lh_PROPERTY_DEFN_ELEM_error(property_defns))
+            return 1;
+    }
+    OPENSSL_free(p);
+    return 0;
+}