Viewing file:  defn_cache.c (4 KB) -rw-r--r--
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/*
* Copyright 2019-2022 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 "internal/core.h"
#include "property_local.h"
#include "crypto/context.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_EX(PROPERTY_DEFN_ELEM);
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);
}
void ossl_property_defns_free(void *vproperty_defns)
{
LHASH_OF(PROPERTY_DEFN_ELEM) *property_defns = vproperty_defns;
if (property_defns != NULL) {
lh_PROPERTY_DEFN_ELEM_doall(property_defns,
&property_defn_free);
lh_PROPERTY_DEFN_ELEM_free(property_defns);
}
}
void *ossl_property_defns_new(OSSL_LIB_CTX *ctx) {
return lh_PROPERTY_DEFN_ELEM_new(&property_defn_hash, &property_defn_cmp);
}
OSSL_PROPERTY_LIST *ossl_prop_defn_get(OSSL_LIB_CTX *ctx, const char *prop)
{
PROPERTY_DEFN_ELEM elem, *r;
LHASH_OF(PROPERTY_DEFN_ELEM) *property_defns;
property_defns = ossl_lib_ctx_get_data(ctx,
OSSL_LIB_CTX_PROPERTY_DEFN_INDEX);
if (property_defns == NULL || !ossl_lib_ctx_read_lock(ctx))
return NULL;
elem.prop = prop;
r = lh_PROPERTY_DEFN_ELEM_retrieve(property_defns, &elem);
ossl_lib_ctx_unlock(ctx);
return r != NULL ? r->defn : NULL;
}
/*
* Cache the property list for a given property string. Callers of this function
* should call ossl_prop_defn_get first to ensure that there is no existing
* cache entry for this property string.
*/
int ossl_prop_defn_set(OSSL_LIB_CTX *ctx, const char *prop,
OSSL_PROPERTY_LIST *pl)
{
PROPERTY_DEFN_ELEM elem, *old, *p = NULL;
size_t len;
LHASH_OF(PROPERTY_DEFN_ELEM) *property_defns;
int res = 1;
property_defns = ossl_lib_ctx_get_data(ctx,
OSSL_LIB_CTX_PROPERTY_DEFN_INDEX);
if (property_defns == NULL)
return 0;
if (prop == NULL)
return 1;
if (!ossl_lib_ctx_write_lock(ctx))
return 0;
if (pl == NULL) {
elem.prop = prop;
lh_PROPERTY_DEFN_ELEM_delete(property_defns, &elem);
goto end;
}
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 (!ossl_assert(old == NULL)) {
/*
* This should not happen. Any caller of ossl_prop_defn_set should
* have called ossl_prop_defn_get first - so we should know that
* there is no existing entry. If we get here we have a bug. We
* deliberately leak the |old| reference in order to avoid a crash
* if there are any existing users of it.
*/
goto end;
}
if (!lh_PROPERTY_DEFN_ELEM_error(property_defns))
goto end;
}
OPENSSL_free(p);
res = 0;
end:
ossl_lib_ctx_unlock(ctx);
return res;
}
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