sl@0: /* crypto/ex_data.c */
sl@0: 
sl@0: /*
sl@0:  * Overhaul notes;
sl@0:  *
sl@0:  * This code is now *mostly* thread-safe. It is now easier to understand in what
sl@0:  * ways it is safe and in what ways it is not, which is an improvement. Firstly,
sl@0:  * all per-class stacks and index-counters for ex_data are stored in the same
sl@0:  * global LHASH table (keyed by class). This hash table uses locking for all
sl@0:  * access with the exception of CRYPTO_cleanup_all_ex_data(), which must only be
sl@0:  * called when no other threads can possibly race against it (even if it was
sl@0:  * locked, the race would mean it's possible the hash table might have been
sl@0:  * recreated after the cleanup). As classes can only be added to the hash table,
sl@0:  * and within each class, the stack of methods can only be incremented, the
sl@0:  * locking mechanics are simpler than they would otherwise be. For example, the
sl@0:  * new/dup/free ex_data functions will lock the hash table, copy the method
sl@0:  * pointers it needs from the relevant class, then unlock the hash table before
sl@0:  * actually applying those method pointers to the task of the new/dup/free
sl@0:  * operations. As they can't be removed from the method-stack, only
sl@0:  * supplemented, there's no race conditions associated with using them outside
sl@0:  * the lock. The get/set_ex_data functions are not locked because they do not
sl@0:  * involve this global state at all - they operate directly with a previously
sl@0:  * obtained per-class method index and a particular "ex_data" variable. These
sl@0:  * variables are usually instantiated per-context (eg. each RSA structure has
sl@0:  * one) so locking on read/write access to that variable can be locked locally
sl@0:  * if required (eg. using the "RSA" lock to synchronise access to a
sl@0:  * per-RSA-structure ex_data variable if required).
sl@0:  * [Geoff]
sl@0:  */
sl@0: 
sl@0: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
sl@0:  * All rights reserved.
sl@0:  *
sl@0:  * This package is an SSL implementation written
sl@0:  * by Eric Young (eay@cryptsoft.com).
sl@0:  * The implementation was written so as to conform with Netscapes SSL.
sl@0:  * 
sl@0:  * This library is free for commercial and non-commercial use as long as
sl@0:  * the following conditions are aheared to.  The following conditions
sl@0:  * apply to all code found in this distribution, be it the RC4, RSA,
sl@0:  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
sl@0:  * included with this distribution is covered by the same copyright terms
sl@0:  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
sl@0:  * 
sl@0:  * Copyright remains Eric Young's, and as such any Copyright notices in
sl@0:  * the code are not to be removed.
sl@0:  * If this package is used in a product, Eric Young should be given attribution
sl@0:  * as the author of the parts of the library used.
sl@0:  * This can be in the form of a textual message at program startup or
sl@0:  * in documentation (online or textual) provided with the package.
sl@0:  * 
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  * 1. Redistributions of source code must retain the copyright
sl@0:  *    notice, this list of conditions and the following disclaimer.
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in the
sl@0:  *    documentation and/or other materials provided with the distribution.
sl@0:  * 3. All advertising materials mentioning features or use of this software
sl@0:  *    must display the following acknowledgement:
sl@0:  *    "This product includes cryptographic software written by
sl@0:  *     Eric Young (eay@cryptsoft.com)"
sl@0:  *    The word 'cryptographic' can be left out if the rouines from the library
sl@0:  *    being used are not cryptographic related :-).
sl@0:  * 4. If you include any Windows specific code (or a derivative thereof) from 
sl@0:  *    the apps directory (application code) you must include an acknowledgement:
sl@0:  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
sl@0:  * 
sl@0:  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
sl@0:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
sl@0:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
sl@0:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
sl@0:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
sl@0:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
sl@0:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
sl@0:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
sl@0:  * SUCH DAMAGE.
sl@0:  * 
sl@0:  * The licence and distribution terms for any publically available version or
sl@0:  * derivative of this code cannot be changed.  i.e. this code cannot simply be
sl@0:  * copied and put under another distribution licence
sl@0:  * [including the GNU Public Licence.]
sl@0:  */
sl@0: /* ====================================================================
sl@0:  * Copyright (c) 1998-2001 The OpenSSL Project.  All rights reserved.
sl@0:  *
sl@0:  * Redistribution and use in source and binary forms, with or without
sl@0:  * modification, are permitted provided that the following conditions
sl@0:  * are met:
sl@0:  *
sl@0:  * 1. Redistributions of source code must retain the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer. 
sl@0:  *
sl@0:  * 2. Redistributions in binary form must reproduce the above copyright
sl@0:  *    notice, this list of conditions and the following disclaimer in
sl@0:  *    the documentation and/or other materials provided with the
sl@0:  *    distribution.
sl@0:  *
sl@0:  * 3. All advertising materials mentioning features or use of this
sl@0:  *    software must display the following acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
sl@0:  *
sl@0:  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
sl@0:  *    endorse or promote products derived from this software without
sl@0:  *    prior written permission. For written permission, please contact
sl@0:  *    openssl-core@openssl.org.
sl@0:  *
sl@0:  * 5. Products derived from this software may not be called "OpenSSL"
sl@0:  *    nor may "OpenSSL" appear in their names without prior written
sl@0:  *    permission of the OpenSSL Project.
sl@0:  *
sl@0:  * 6. Redistributions of any form whatsoever must retain the following
sl@0:  *    acknowledgment:
sl@0:  *    "This product includes software developed by the OpenSSL Project
sl@0:  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
sl@0:  *
sl@0:  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
sl@0:  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
sl@0:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
sl@0:  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
sl@0:  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
sl@0:  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
sl@0:  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
sl@0:  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
sl@0:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
sl@0:  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
sl@0:  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
sl@0:  * OF THE POSSIBILITY OF SUCH DAMAGE.
sl@0:  * ====================================================================
sl@0:  *
sl@0:  * This product includes cryptographic software written by Eric Young
sl@0:  * (eay@cryptsoft.com).  This product includes software written by Tim
sl@0:  * Hudson (tjh@cryptsoft.com).
sl@0:  *
sl@0:  */
sl@0:  /*
sl@0:  © Portions copyright (c) 2006 Nokia Corporation.  All rights reserved.
sl@0:  */
sl@0: 
sl@0: #include "cryptlib.h"
sl@0: #include <openssl/lhash.h>
sl@0: #if (defined(SYMBIAN) && (defined(__WINSCW__) || defined(__WINS__)))
sl@0: #include "libcrypto_wsd_macros.h"
sl@0: #include "libcrypto_wsd.h"
sl@0: #endif
sl@0: 
sl@0: #ifndef EMULATOR
sl@0: /* What an "implementation of ex_data functionality" looks like */
sl@0: struct st_CRYPTO_EX_DATA_IMPL
sl@0: 	{
sl@0: 	/*********************/
sl@0: 	/* GLOBAL OPERATIONS */
sl@0: 	/* Return a new class index */
sl@0: 	int (*cb_new_class)(void);
sl@0: 	/* Cleanup all state used by the implementation */
sl@0: 	void (*cb_cleanup)(void);
sl@0: 	/************************/
sl@0: 	/* PER-CLASS OPERATIONS */
sl@0: 	/* Get a new method index within a class */
sl@0: 	int (*cb_get_new_index)(int class_index, long argl, void *argp,
sl@0: 			CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
sl@0: 			CRYPTO_EX_free *free_func);
sl@0: 	/* Initialise a new CRYPTO_EX_DATA of a given class */
sl@0: 	int (*cb_new_ex_data)(int class_index, void *obj,
sl@0: 			CRYPTO_EX_DATA *ad);
sl@0: 	/* Duplicate a CRYPTO_EX_DATA of a given class onto a copy */
sl@0: 	int (*cb_dup_ex_data)(int class_index, CRYPTO_EX_DATA *to,
sl@0: 			CRYPTO_EX_DATA *from);
sl@0: 	/* Cleanup a CRYPTO_EX_DATA of a given class */
sl@0: 	void (*cb_free_ex_data)(int class_index, void *obj,
sl@0: 			CRYPTO_EX_DATA *ad);
sl@0: 	};
sl@0: #endif
sl@0: #ifndef EMULATOR
sl@0: /* The implementation we use at run-time */
sl@0: static const CRYPTO_EX_DATA_IMPL *impl = NULL;
sl@0: #else
sl@0:  GET_STATIC_VAR_FROM_TLS(impl ,ex_data,CRYPTO_EX_DATA_IMPL *)
sl@0:  #define impl  (*GET_WSD_VAR_NAME(impl,ex_data,s)())
sl@0: #endif
sl@0: 
sl@0: /* To call "impl" functions, use this macro rather than referring to 'impl' directly, eg.
sl@0:  * EX_IMPL(get_new_index)(...); */
sl@0: #define EX_IMPL(a) impl->cb_##a
sl@0: 
sl@0: /* Predeclare the "default" ex_data implementation */
sl@0: static int int_new_class(void);
sl@0: static void int_cleanup(void);
sl@0: static int int_get_new_index(int class_index, long argl, void *argp,
sl@0: 		CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
sl@0: 		CRYPTO_EX_free *free_func);
sl@0: static int int_new_ex_data(int class_index, void *obj,
sl@0: 		CRYPTO_EX_DATA *ad);
sl@0: static int int_dup_ex_data(int class_index, CRYPTO_EX_DATA *to,
sl@0: 		CRYPTO_EX_DATA *from);
sl@0: static void int_free_ex_data(int class_index, void *obj,
sl@0: 		CRYPTO_EX_DATA *ad);
sl@0: 		
sl@0: 		
sl@0: #ifndef EMULATOR		
sl@0: static CRYPTO_EX_DATA_IMPL impl_default =
sl@0: 	{
sl@0: 	int_new_class,
sl@0: 	int_cleanup,
sl@0: 	int_get_new_index,
sl@0: 	int_new_ex_data,
sl@0: 	int_dup_ex_data,
sl@0: 	int_free_ex_data
sl@0: 	};
sl@0: #else	
sl@0:   GET_STATIC_VAR_FROM_TLS(impl_default,ex_data,CRYPTO_EX_DATA_IMPL)
sl@0:   #define impl_default (*GET_WSD_VAR_NAME(impl_default,ex_data, s)())
sl@0:   const CRYPTO_EX_DATA_IMPL temp_s_impl_default =
sl@0: 	{
sl@0: 	int_new_class,
sl@0: 	int_cleanup,
sl@0: 	int_get_new_index,
sl@0: 	int_new_ex_data,
sl@0: 	int_dup_ex_data,
sl@0: 	int_free_ex_data
sl@0: 	};
sl@0: #endif
sl@0: 
sl@0: /* Internal function that checks whether "impl" is set and if not, sets it to
sl@0:  * the default. */
sl@0: static void impl_check(void)
sl@0: 	{
sl@0: 	CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
sl@0: 	if(!impl)
sl@0: 		impl = &impl_default;
sl@0: 	CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
sl@0: 	}
sl@0: /* A macro wrapper for impl_check that first uses a non-locked test before
sl@0:  * invoking the function (which checks again inside a lock). */
sl@0: #define IMPL_CHECK if(!impl) impl_check();
sl@0: 
sl@0: /* API functions to get/set the "ex_data" implementation */
sl@0: EXPORT_C const CRYPTO_EX_DATA_IMPL *CRYPTO_get_ex_data_implementation(void)
sl@0: 	{
sl@0: 	IMPL_CHECK
sl@0: 	return impl;
sl@0: 	}
sl@0: EXPORT_C int CRYPTO_set_ex_data_implementation(CRYPTO_EX_DATA_IMPL *i)
sl@0: 	{
sl@0: 	int toret = 0;
sl@0: 	CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
sl@0: 	if(!impl)
sl@0: 		{
sl@0: 		impl = i;
sl@0: 		toret = 1;
sl@0: 		}
sl@0: 	CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
sl@0: 	return toret;
sl@0: 	}
sl@0: 
sl@0: /****************************************************************************/
sl@0: /* Interal (default) implementation of "ex_data" support. API functions are
sl@0:  * further down. */
sl@0: 
sl@0: /* The type that represents what each "class" used to implement locally. A STACK
sl@0:  * of CRYPTO_EX_DATA_FUNCS plus a index-counter. The 'class_index' is the global
sl@0:  * value representing the class that is used to distinguish these items. */
sl@0: typedef struct st_ex_class_item {
sl@0: 	int class_index;
sl@0: 	STACK_OF(CRYPTO_EX_DATA_FUNCS) *meth;
sl@0: 	int meth_num;
sl@0: } EX_CLASS_ITEM;
sl@0: 
sl@0: #ifndef EMULATOR
sl@0: /* When assigning new class indexes, this is our counter */
sl@0: static int ex_class = CRYPTO_EX_INDEX_USER;
sl@0: 
sl@0: /* The global hash table of EX_CLASS_ITEM items */
sl@0: static LHASH *ex_data = NULL;
sl@0: #else
sl@0:  GET_STATIC_VAR_FROM_TLS(ex_class ,ex_data,int)
sl@0:  #define ex_class (*GET_WSD_VAR_NAME(ex_class ,ex_data,s)())
sl@0:  GET_STATIC_VAR_FROM_TLS(ex_data ,ex_data,LHASH *)
sl@0:  #define ex_data (*GET_WSD_VAR_NAME(ex_data ,ex_data,s)())
sl@0: 
sl@0: #endif
sl@0: 
sl@0: /* The callbacks required in the "ex_data" hash table */
sl@0: static unsigned long ex_hash_cb(const void *a_void)
sl@0: 	{
sl@0: 	return ((const EX_CLASS_ITEM *)a_void)->class_index;
sl@0: 	}
sl@0: static int ex_cmp_cb(const void *a_void, const void *b_void)
sl@0: 	{
sl@0: 	return (((const EX_CLASS_ITEM *)a_void)->class_index -
sl@0: 		((const EX_CLASS_ITEM *)b_void)->class_index);
sl@0: 	}
sl@0: 
sl@0: /* Internal functions used by the "impl_default" implementation to access the
sl@0:  * state */
sl@0: 
sl@0: static int ex_data_check(void)
sl@0: 	{
sl@0: 	int toret = 1;
sl@0: 	CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
sl@0: 	if(!ex_data && ((ex_data = lh_new(ex_hash_cb, ex_cmp_cb)) == NULL))
sl@0: 		toret = 0;
sl@0: 	CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
sl@0: 	return toret;
sl@0: 	}
sl@0: /* This macros helps reduce the locking from repeated checks because the
sl@0:  * ex_data_check() function checks ex_data again inside a lock. */
sl@0: #define EX_DATA_CHECK(iffail) if(!ex_data && !ex_data_check()) {iffail}
sl@0: 
sl@0: /* This "inner" callback is used by the callback function that follows it */
sl@0: static void def_cleanup_util_cb(CRYPTO_EX_DATA_FUNCS *funcs)
sl@0: 	{
sl@0: 	OPENSSL_free(funcs);
sl@0: 	}
sl@0: 
sl@0: /* This callback is used in lh_doall to destroy all EX_CLASS_ITEM values from
sl@0:  * "ex_data" prior to the ex_data hash table being itself destroyed. Doesn't do
sl@0:  * any locking. */
sl@0: static void def_cleanup_cb(void *a_void)
sl@0: 	{
sl@0: 	EX_CLASS_ITEM *item = (EX_CLASS_ITEM *)a_void;
sl@0: 	sk_CRYPTO_EX_DATA_FUNCS_pop_free(item->meth, def_cleanup_util_cb);
sl@0: 	OPENSSL_free(item);
sl@0: 	}
sl@0: 
sl@0: /* Return the EX_CLASS_ITEM from the "ex_data" hash table that corresponds to a
sl@0:  * given class. Handles locking. */
sl@0: static EX_CLASS_ITEM *def_get_class(int class_index)
sl@0: 	{
sl@0: 	EX_CLASS_ITEM d, *p, *gen;
sl@0: 	EX_DATA_CHECK(return NULL;)
sl@0: 	d.class_index = class_index;
sl@0: 	CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
sl@0: 	p = lh_retrieve(ex_data, &d);
sl@0: 	if(!p)
sl@0: 		{
sl@0: 		gen = OPENSSL_malloc(sizeof(EX_CLASS_ITEM));
sl@0: 		if(gen)
sl@0: 			{
sl@0: 			gen->class_index = class_index;
sl@0: 			gen->meth_num = 0;
sl@0: 			gen->meth = sk_CRYPTO_EX_DATA_FUNCS_new_null();
sl@0: 			if(!gen->meth)
sl@0: 				OPENSSL_free(gen);
sl@0: 			else
sl@0: 				{
sl@0: 				/* Because we're inside the ex_data lock, the
sl@0: 				 * return value from the insert will be NULL */
sl@0: 				lh_insert(ex_data, gen);
sl@0: 				p = gen;
sl@0: 				}
sl@0: 			}
sl@0: 		}
sl@0: 	CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
sl@0: 	if(!p)
sl@0: 		CRYPTOerr(CRYPTO_F_DEF_GET_CLASS,ERR_R_MALLOC_FAILURE);
sl@0: 	return p;
sl@0: 	}
sl@0: 
sl@0: /* Add a new method to the given EX_CLASS_ITEM and return the corresponding
sl@0:  * index (or -1 for error). Handles locking. */
sl@0: static int def_add_index(EX_CLASS_ITEM *item, long argl, void *argp,
sl@0: 		CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
sl@0: 		CRYPTO_EX_free *free_func)
sl@0: 	{
sl@0: 	int toret = -1;
sl@0: 	CRYPTO_EX_DATA_FUNCS *a = (CRYPTO_EX_DATA_FUNCS *)OPENSSL_malloc(
sl@0: 					sizeof(CRYPTO_EX_DATA_FUNCS));
sl@0: 	if(!a)
sl@0: 		{
sl@0: 		CRYPTOerr(CRYPTO_F_DEF_ADD_INDEX,ERR_R_MALLOC_FAILURE);
sl@0: 		return -1;
sl@0: 		}
sl@0: 	a->argl=argl;
sl@0: 	a->argp=argp;
sl@0: 	a->new_func=new_func;
sl@0: 	a->dup_func=dup_func;
sl@0: 	a->free_func=free_func;
sl@0: 	CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
sl@0: 	while (sk_CRYPTO_EX_DATA_FUNCS_num(item->meth) <= item->meth_num)
sl@0: 		{
sl@0: 		if (!sk_CRYPTO_EX_DATA_FUNCS_push(item->meth, NULL))
sl@0: 			{
sl@0: 			CRYPTOerr(CRYPTO_F_DEF_ADD_INDEX,ERR_R_MALLOC_FAILURE);
sl@0: 			OPENSSL_free(a);
sl@0: 			goto err;
sl@0: 			}
sl@0: 		}
sl@0: 	toret = item->meth_num++;
sl@0: 	(void)sk_CRYPTO_EX_DATA_FUNCS_set(item->meth, toret, a);
sl@0: err:
sl@0: 	CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
sl@0: 	return toret;
sl@0: 	}
sl@0: 
sl@0: /**************************************************************/
sl@0: /* The functions in the default CRYPTO_EX_DATA_IMPL structure */
sl@0: 
sl@0: static int int_new_class(void)
sl@0: 	{
sl@0: 	int toret;
sl@0: 	CRYPTO_w_lock(CRYPTO_LOCK_EX_DATA);
sl@0: 	toret = ex_class++;
sl@0: 	CRYPTO_w_unlock(CRYPTO_LOCK_EX_DATA);
sl@0: 	return toret;
sl@0: 	}
sl@0: 
sl@0: static void int_cleanup(void)
sl@0: 	{
sl@0: 	EX_DATA_CHECK(return;)
sl@0: 	lh_doall(ex_data, def_cleanup_cb);
sl@0: 	lh_free(ex_data);
sl@0: 	ex_data = NULL;
sl@0: 	impl = NULL;
sl@0: 	}
sl@0: 
sl@0: static int int_get_new_index(int class_index, long argl, void *argp,
sl@0: 		CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
sl@0: 		CRYPTO_EX_free *free_func)
sl@0: 	{
sl@0: 	EX_CLASS_ITEM *item = def_get_class(class_index);
sl@0: 	if(!item)
sl@0: 		return -1;
sl@0: 	return def_add_index(item, argl, argp, new_func, dup_func, free_func);
sl@0: 	}
sl@0: 
sl@0: /* Thread-safe by copying a class's array of "CRYPTO_EX_DATA_FUNCS" entries in
sl@0:  * the lock, then using them outside the lock. NB: Thread-safety only applies to
sl@0:  * the global "ex_data" state (ie. class definitions), not thread-safe on 'ad'
sl@0:  * itself. */
sl@0: static int int_new_ex_data(int class_index, void *obj,
sl@0: 		CRYPTO_EX_DATA *ad)
sl@0: 	{
sl@0: 	int mx,i;
sl@0: 	void *ptr;
sl@0: 	CRYPTO_EX_DATA_FUNCS **storage = NULL;
sl@0: 	EX_CLASS_ITEM *item = def_get_class(class_index);
sl@0: 	if(!item)
sl@0: 		/* error is already set */
sl@0: 		return 0;
sl@0: 	ad->sk = NULL;
sl@0: 	CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA);
sl@0: 	mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth);
sl@0: 	if(mx > 0)
sl@0: 		{
sl@0: 		storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS*));
sl@0: 		if(!storage)
sl@0: 			goto skip;
sl@0: 		for(i = 0; i < mx; i++)
sl@0: 			storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth,i);
sl@0: 		}
sl@0: skip:
sl@0: 	CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA);
sl@0: 	if((mx > 0) && !storage)
sl@0: 		{
sl@0: 		CRYPTOerr(CRYPTO_F_INT_NEW_EX_DATA,ERR_R_MALLOC_FAILURE);
sl@0: 		return 0;
sl@0: 		}
sl@0: 	for(i = 0; i < mx; i++)
sl@0: 		{
sl@0: 		if(storage[i] && storage[i]->new_func)
sl@0: 			{
sl@0: 			ptr = CRYPTO_get_ex_data(ad, i);
sl@0: 			storage[i]->new_func(obj,ptr,ad,i,
sl@0: 				storage[i]->argl,storage[i]->argp);
sl@0: 			}
sl@0: 		}
sl@0: 	if(storage)
sl@0: 		OPENSSL_free(storage);
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: /* Same thread-safety notes as for "int_new_ex_data" */
sl@0: static int int_dup_ex_data(int class_index, CRYPTO_EX_DATA *to,
sl@0: 		CRYPTO_EX_DATA *from)
sl@0: 	{
sl@0: 	int mx, j, i;
sl@0: 	char *ptr;
sl@0: 	CRYPTO_EX_DATA_FUNCS **storage = NULL;
sl@0: 	EX_CLASS_ITEM *item;
sl@0: 	if(!from->sk)
sl@0: 		/* 'to' should be "blank" which *is* just like 'from' */
sl@0: 		return 1;
sl@0: 	if((item = def_get_class(class_index)) == NULL)
sl@0: 		return 0;
sl@0: 	CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA);
sl@0: 	mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth);
sl@0: 	j = sk_num(from->sk);
sl@0: 	if(j < mx)
sl@0: 		mx = j;
sl@0: 	if(mx > 0)
sl@0: 		{
sl@0: 		storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS*));
sl@0: 		if(!storage)
sl@0: 			goto skip;
sl@0: 		for(i = 0; i < mx; i++)
sl@0: 			storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth,i);
sl@0: 		}
sl@0: skip:
sl@0: 	CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA);
sl@0: 	if((mx > 0) && !storage)
sl@0: 		{
sl@0: 		CRYPTOerr(CRYPTO_F_INT_DUP_EX_DATA,ERR_R_MALLOC_FAILURE);
sl@0: 		return 0;
sl@0: 		}
sl@0: 	for(i = 0; i < mx; i++)
sl@0: 		{
sl@0: 		ptr = CRYPTO_get_ex_data(from, i);
sl@0: 		if(storage[i] && storage[i]->dup_func)
sl@0: 			storage[i]->dup_func(to,from,&ptr,i,
sl@0: 				storage[i]->argl,storage[i]->argp);
sl@0: 		CRYPTO_set_ex_data(to,i,ptr);
sl@0: 		}
sl@0: 	if(storage)
sl@0: 		OPENSSL_free(storage);
sl@0: 	return 1;
sl@0: 	}
sl@0: 
sl@0: /* Same thread-safety notes as for "int_new_ex_data" */
sl@0: static void int_free_ex_data(int class_index, void *obj,
sl@0: 		CRYPTO_EX_DATA *ad)
sl@0: 	{
sl@0: 	int mx,i;
sl@0: 	EX_CLASS_ITEM *item;
sl@0: 	void *ptr;
sl@0: 	CRYPTO_EX_DATA_FUNCS **storage = NULL;
sl@0: 	if((item = def_get_class(class_index)) == NULL)
sl@0: 		return;
sl@0: 	CRYPTO_r_lock(CRYPTO_LOCK_EX_DATA);
sl@0: 	mx = sk_CRYPTO_EX_DATA_FUNCS_num(item->meth);
sl@0: 	if(mx > 0)
sl@0: 		{
sl@0: 		storage = OPENSSL_malloc(mx * sizeof(CRYPTO_EX_DATA_FUNCS*));
sl@0: 		if(!storage)
sl@0: 			goto skip;
sl@0: 		for(i = 0; i < mx; i++)
sl@0: 			storage[i] = sk_CRYPTO_EX_DATA_FUNCS_value(item->meth,i);
sl@0: 		}
sl@0: skip:
sl@0: 	CRYPTO_r_unlock(CRYPTO_LOCK_EX_DATA);
sl@0: 	if((mx > 0) && !storage)
sl@0: 		{
sl@0: 		CRYPTOerr(CRYPTO_F_INT_FREE_EX_DATA,ERR_R_MALLOC_FAILURE);
sl@0: 		return;
sl@0: 		}
sl@0: 	for(i = 0; i < mx; i++)
sl@0: 		{
sl@0: 		if(storage[i] && storage[i]->free_func)
sl@0: 			{
sl@0: 			ptr = CRYPTO_get_ex_data(ad,i);
sl@0: 			storage[i]->free_func(obj,ptr,ad,i,
sl@0: 				storage[i]->argl,storage[i]->argp);
sl@0: 			}
sl@0: 		}
sl@0: 	if(storage)
sl@0: 		OPENSSL_free(storage);
sl@0: 	if(ad->sk)
sl@0: 		{
sl@0: 		sk_free(ad->sk);
sl@0: 		ad->sk=NULL;
sl@0: 		}
sl@0: 	}
sl@0: 
sl@0: /********************************************************************/
sl@0: /* API functions that defer all "state" operations to the "ex_data"
sl@0:  * implementation we have set. */
sl@0: 
sl@0: /* Obtain an index for a new class (not the same as getting a new index within
sl@0:  * an existing class - this is actually getting a new *class*) */
sl@0: EXPORT_C int CRYPTO_ex_data_new_class(void)
sl@0: 	{
sl@0: 	IMPL_CHECK
sl@0: 	return EX_IMPL(new_class)();
sl@0: 	}
sl@0: 
sl@0: /* Release all "ex_data" state to prevent memory leaks. This can't be made
sl@0:  * thread-safe without overhauling a lot of stuff, and shouldn't really be
sl@0:  * called under potential race-conditions anyway (it's for program shutdown
sl@0:  * after all). */
sl@0: EXPORT_C void CRYPTO_cleanup_all_ex_data(void)
sl@0: 	{
sl@0: 	IMPL_CHECK
sl@0: 	EX_IMPL(cleanup)();
sl@0: 	}
sl@0: 
sl@0: /* Inside an existing class, get/register a new index. */
sl@0: EXPORT_C int CRYPTO_get_ex_new_index(int class_index, long argl, void *argp,
sl@0: 		CRYPTO_EX_new *new_func, CRYPTO_EX_dup *dup_func,
sl@0: 		CRYPTO_EX_free *free_func)
sl@0: 	{
sl@0: 	int ret = -1;
sl@0: 
sl@0: 	IMPL_CHECK
sl@0: 	ret = EX_IMPL(get_new_index)(class_index,
sl@0: 			argl, argp, new_func, dup_func, free_func);
sl@0: 	return ret;
sl@0: 	}
sl@0: 
sl@0: /* Initialise a new CRYPTO_EX_DATA for use in a particular class - including
sl@0:  * calling new() callbacks for each index in the class used by this variable */
sl@0: EXPORT_C int CRYPTO_new_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad)
sl@0: 	{
sl@0: 	IMPL_CHECK
sl@0: 	return EX_IMPL(new_ex_data)(class_index, obj, ad);
sl@0: 	}
sl@0: 
sl@0: /* Duplicate a CRYPTO_EX_DATA variable - including calling dup() callbacks for
sl@0:  * each index in the class used by this variable */
sl@0: EXPORT_C int CRYPTO_dup_ex_data(int class_index, CRYPTO_EX_DATA *to,
sl@0: 	     CRYPTO_EX_DATA *from)
sl@0: 	{
sl@0: 	IMPL_CHECK
sl@0: 	return EX_IMPL(dup_ex_data)(class_index, to, from);
sl@0: 	}
sl@0: 
sl@0: /* Cleanup a CRYPTO_EX_DATA variable - including calling free() callbacks for
sl@0:  * each index in the class used by this variable */
sl@0: EXPORT_C void CRYPTO_free_ex_data(int class_index, void *obj, CRYPTO_EX_DATA *ad)
sl@0: 	{
sl@0: 	IMPL_CHECK
sl@0: 	EX_IMPL(free_ex_data)(class_index, obj, ad);
sl@0: 	}
sl@0: 
sl@0: /* For a given CRYPTO_EX_DATA variable, set the value corresponding to a
sl@0:  * particular index in the class used by this variable */
sl@0: EXPORT_C int CRYPTO_set_ex_data(CRYPTO_EX_DATA *ad, int idx, void *val)
sl@0: 	{
sl@0: 	int i;
sl@0: 
sl@0: 	if (ad->sk == NULL)
sl@0: 		{
sl@0: 		if ((ad->sk=sk_new_null()) == NULL)
sl@0: 			{
sl@0: 			CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA,ERR_R_MALLOC_FAILURE);
sl@0: 			return(0);
sl@0: 			}
sl@0: 		}
sl@0: 	i=sk_num(ad->sk);
sl@0: 
sl@0: 	while (i <= idx)
sl@0: 		{
sl@0: 		if (!sk_push(ad->sk,NULL))
sl@0: 			{
sl@0: 			CRYPTOerr(CRYPTO_F_CRYPTO_SET_EX_DATA,ERR_R_MALLOC_FAILURE);
sl@0: 			return(0);
sl@0: 			}
sl@0: 		i++;
sl@0: 		}
sl@0: 	sk_set(ad->sk,idx,val);
sl@0: 	return(1);
sl@0: 	}
sl@0: 
sl@0: /* For a given CRYPTO_EX_DATA_ variable, get the value corresponding to a
sl@0:  * particular index in the class used by this variable */
sl@0: EXPORT_C void *CRYPTO_get_ex_data(const CRYPTO_EX_DATA *ad, int idx)
sl@0: 	{
sl@0: 	if (ad->sk == NULL)
sl@0: 		return(0);
sl@0: 	else if (idx >= sk_num(ad->sk))
sl@0: 		return(0);
sl@0: 	else
sl@0: 		return(sk_value(ad->sk,idx));
sl@0: 	}
sl@0: 
sl@0: IMPLEMENT_STACK_OF(CRYPTO_EX_DATA_FUNCS)