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Diffstat (limited to 'lib/crypto/c_src/crypto_callback.c')
| -rw-r--r-- | lib/crypto/c_src/crypto_callback.c | 184 |
1 files changed, 184 insertions, 0 deletions
diff --git a/lib/crypto/c_src/crypto_callback.c b/lib/crypto/c_src/crypto_callback.c new file mode 100644 index 0000000000..3acbbf406b --- /dev/null +++ b/lib/crypto/c_src/crypto_callback.c @@ -0,0 +1,184 @@ +/* + * %CopyrightBegin% + * + * Copyright Ericsson AB 2014-2016. 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) +#elif defined(__GNUC__) && __GNUC__ >= 4 +# define DLLEXPORT __attribute__ ((visibility("default"))) +#elif defined (__SUNPRO_C) && (__SUNPRO_C >= 0x550) +# define DLLEXPORT __global +#else +# define DLLEXPORT +#endif + +/* to be dlsym'ed */ +DLLEXPORT struct crypto_callbacks* get_crypto_callbacks(int nlocks); + + +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 */ + +static ErlNifRWLock** lock_vec = NULL; /* Static locks used by openssl */ + +#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 + |