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/*
* %CopyrightBegin%
*
* Copyright Ericsson AB 2014. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* %CopyrightEnd%
*/
#include <stdio.h>
#include <string.h>
#include <openssl/opensslconf.h>
#include "erl_nif.h"
#include "crypto_callback.h"
#ifdef DEBUG
# define ASSERT(e) \
((void) ((e) ? 1 : (fprintf(stderr,"Assert '%s' failed at %s:%d\n",\
#e, __FILE__, __LINE__), abort(), 0)))
#else
# define ASSERT(e) ((void) 1)
#endif
#ifdef __GNUC__
# define INLINE __inline__
#elif defined(__WIN32__)
# define INLINE __forceinline
#else
# define INLINE
#endif
#ifdef __WIN32__
# define DLLEXPORT __declspec(dllexport)
#else
# define DLLEXPORT
#endif
/* to be dlsym'ed */
DLLEXPORT struct crypto_callbacks* get_crypto_callbacks(int nlocks);
static ErlNifRWLock** lock_vec = NULL; /* Static locks used by openssl */
static void nomem(size_t size, const char* op)
{
fprintf(stderr, "Out of memory abort. Crypto failed to %s %zu bytes.\r\n",
op, size);
abort();
}
static void* crypto_alloc(size_t size)
{
void *ret = enif_alloc(size);
if (!ret && size)
nomem(size, "allocate");
return ret;
}
static void* crypto_realloc(void* ptr, size_t size)
{
void* ret = enif_realloc(ptr, size);
if (!ret && size)
nomem(size, "reallocate");
return ret;
}
static void crypto_free(void* ptr)
{
enif_free(ptr);
}
#ifdef OPENSSL_THREADS /* vvvvvvvvvvvvvvv OPENSSL_THREADS vvvvvvvvvvvvvvvv */
#include <openssl/crypto.h>
static INLINE void locking(int mode, ErlNifRWLock* lock)
{
switch (mode) {
case CRYPTO_LOCK|CRYPTO_READ:
enif_rwlock_rlock(lock);
break;
case CRYPTO_LOCK|CRYPTO_WRITE:
enif_rwlock_rwlock(lock);
break;
case CRYPTO_UNLOCK|CRYPTO_READ:
enif_rwlock_runlock(lock);
break;
case CRYPTO_UNLOCK|CRYPTO_WRITE:
enif_rwlock_rwunlock(lock);
break;
default:
ASSERT(!"Invalid lock mode");
}
}
static void locking_function(int mode, int n, const char *file, int line)
{
locking(mode, lock_vec[n]);
}
static unsigned long id_function(void)
{
return (unsigned long) enif_thread_self();
}
/* Dynamic locking, not used by current openssl version (0.9.8)
*/
static struct CRYPTO_dynlock_value* dyn_create_function(const char *file, int line)
{
return (struct CRYPTO_dynlock_value*) enif_rwlock_create("crypto_dyn");
}
static void dyn_lock_function(int mode, struct CRYPTO_dynlock_value* ptr,const char *file, int line)
{
locking(mode, (ErlNifRWLock*)ptr);
}
static void dyn_destroy_function(struct CRYPTO_dynlock_value *ptr, const char *file, int line)
{
enif_rwlock_destroy((ErlNifRWLock*)ptr);
}
#endif /* ^^^^^^^^^^^^^^^^^^^^^^ OPENSSL_THREADS ^^^^^^^^^^^^^^^^^^^^^^ */
DLLEXPORT struct crypto_callbacks* get_crypto_callbacks(int nlocks)
{
static int is_initialized = 0;
static struct crypto_callbacks the_struct = {
sizeof(struct crypto_callbacks),
&crypto_alloc,
&crypto_realloc,
&crypto_free,
#ifdef OPENSSL_THREADS
&locking_function,
&id_function,
&dyn_create_function,
&dyn_lock_function,
&dyn_destroy_function
#endif /* OPENSSL_THREADS */
};
if (!is_initialized) {
#ifdef OPENSSL_THREADS
if (nlocks > 0) {
int i;
lock_vec = enif_alloc(nlocks*sizeof(*lock_vec));
if (lock_vec==NULL) return NULL;
memset(lock_vec, 0, nlocks*sizeof(*lock_vec));
for (i=nlocks-1; i>=0; --i) {
lock_vec[i] = enif_rwlock_create("crypto_stat");
if (lock_vec[i]==NULL) return NULL;
}
}
#endif
is_initialized = 1;
}
return &the_struct;
}
#ifdef HAVE_DYNAMIC_CRYPTO_LIB
/* This is not really a NIF library, but we use ERL_NIF_INIT in order to
* get access to the erl_nif API (on Windows).
*/
ERL_NIF_INIT(dummy, (ErlNifFunc*)NULL , NULL, NULL, NULL, NULL)
#endif
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