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