/* crypto/mem.c */

/* 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:

 * 1. Redistributions of source code must retain the 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 acknowledgement:

 *    "This product includes cryptographic software written by

 *     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

 *    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

 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR 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.

 *

 * 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.]

 */

#include <stdio.h>

#include <stdlib.h>

#include <openssl/crypto.h>

#include "cryptlib.h"

static int allow_customize = 1; /* we provide flexible functions for */

static int allow_customize_debug = 1; /* exchanging memory-related functions

                                       * at run-time, but this must be done

                                       * before any blocks are actually

                                       * allocated; or we'll run into huge

                                       * problems when malloc/free pairs

                                       * don't match etc. */

/*

 * the following pointers may be changed as long as 'allow_customize' is set

 */

static void *(*malloc_func) (size_t) = malloc;

static void *default_malloc_ex(size_t num, const char *file, int line)

{

    return malloc_func(num);

}

static void *(*malloc_ex_func) (size_t, const char *file, int line)

    = default_malloc_ex;

#ifdef OPENSSL_SYS_VMS

# if __INITIAL_POINTER_SIZE == 64

#  define realloc _realloc64

# elif __INITIAL_POINTER_SIZE == 32

#  define realloc _realloc32

# endif

#endif

static void *(*realloc_func) (void *, size_t) = realloc;

static void *default_realloc_ex(void *str, size_t num,

                                const char *file, int line)

{

    return realloc_func(str, num);

}

static void *(*realloc_ex_func) (void *, size_t, const char *file, int line)

    = default_realloc_ex;

#ifdef OPENSSL_SYS_VMS

   static void (*free_func) (__void_ptr64) = free;

#else

   static void (*free_func) (void *) = free;

#endif

static void *(*malloc_locked_func) (size_t) = malloc;

static void *default_malloc_locked_ex(size_t num, const char *file, int line)

{

    return malloc_locked_func(num);

}

static void *(*malloc_locked_ex_func) (size_t, const char *file, int line)

    = default_malloc_locked_ex;

#ifdef OPENSSL_SYS_VMS

   static void (*free_locked_func) (__void_ptr64) = free;

#else

   static void (*free_locked_func) (void *) = free;

#endif

/* may be changed as long as 'allow_customize_debug' is set */

/* XXX use correct function pointer types */

#ifdef CRYPTO_MDEBUG

/* use default functions from mem_dbg.c */

static void (*malloc_debug_func) (void *, int, const char *, int, int)

    = CRYPTO_dbg_malloc;

static void (*realloc_debug_func) (void *, void *, int, const char *, int,

                                   int)

    = CRYPTO_dbg_realloc;

static void (*free_debug_func) (void *, int) = CRYPTO_dbg_free;

static void (*set_debug_options_func) (long) = CRYPTO_dbg_set_options;

static long (*get_debug_options_func) (void) = CRYPTO_dbg_get_options;

#else

/*

 * applications can use CRYPTO_malloc_debug_init() to select above case at

 * run-time

 */

static void (*malloc_debug_func) (void *, int, const char *, int, int) = NULL;

static void (*realloc_debug_func) (void *, void *, int, const char *, int,

                                   int)

    = NULL;

static void (*free_debug_func) (void *, int) = NULL;

static void (*set_debug_options_func) (long) = NULL;

static long (*get_debug_options_func) (void) = NULL;

#endif

int CRYPTO_set_mem_functions(void *(*m) (size_t), void *(*r) (void *, size_t),

                             void (*f) (void *))

{

    if (!allow_customize)

        return 0;

    if ((m == 0) || (r == 0) || (f == 0))

        return 0;

    /* Dummy call just to ensure OPENSSL_init() gets linked in */

    OPENSSL_init();

    malloc_func = m;

    malloc_ex_func = default_malloc_ex;

    realloc_func = r;

    realloc_ex_func = default_realloc_ex;

    free_func = f;

    malloc_locked_func = m;

    malloc_locked_ex_func = default_malloc_locked_ex;

    free_locked_func = f;

    return 1;

}

int CRYPTO_set_mem_ex_functions(void *(*m) (size_t, const char *, int),

                                void *(*r) (void *, size_t, const char *,

                                            int), void (*f) (void *))

{

    if (!allow_customize)

        return 0;

    if ((m == 0) || (r == 0) || (f == 0))

        return 0;

    malloc_func = 0;

    malloc_ex_func = m;

    realloc_func = 0;

    realloc_ex_func = r;

    free_func = f;

    malloc_locked_func = 0;

    malloc_locked_ex_func = m;

    free_locked_func = f;

    return 1;

}

int CRYPTO_set_locked_mem_functions(void *(*m) (size_t), void (*f) (void *))

{

    if (!allow_customize)

        return 0;

    if ((m == NULL) || (f == NULL))

        return 0;

    malloc_locked_func = m;

    malloc_locked_ex_func = default_malloc_locked_ex;

    free_locked_func = f;

    return 1;

}

int CRYPTO_set_locked_mem_ex_functions(void *(*m) (size_t, const char *, int),

                                       void (*f) (void *))

{

    if (!allow_customize)

        return 0;

    if ((m == NULL) || (f == NULL))

        return 0;

    malloc_locked_func = 0;

    malloc_locked_ex_func = m;

    free_func = f;

    return 1;

}

int CRYPTO_set_mem_debug_functions(void (*m)

                                    (void *, int, const char *, int, int),

                                   void (*r) (void *, void *, int,

                                              const char *, int, int),

                                   void (*f) (void *, int), void (*so) (long),

                                   long (*go) (void))

{

    if (!allow_customize_debug)

        return 0;

    OPENSSL_init();

    malloc_debug_func = m;

    realloc_debug_func = r;

    free_debug_func = f;

    set_debug_options_func = so;

    get_debug_options_func = go;

    return 1;

}

void CRYPTO_get_mem_functions(void *(**m) (size_t),

                              void *(**r) (void *, size_t),

                              void (**f) (void *))

{

    if (m != NULL)

        *m = (malloc_ex_func == default_malloc_ex) ? malloc_func : 0;

    if (r != NULL)

        *r = (realloc_ex_func == default_realloc_ex) ? realloc_func : 0;

    if (f != NULL)

        *f = free_func;

}

void CRYPTO_get_mem_ex_functions(void *(**m) (size_t, const char *, int),

                                 void *(**r) (void *, size_t, const char *,

                                              int), void (**f) (void *))

{

    if (m != NULL)

        *m = (malloc_ex_func != default_malloc_ex) ? malloc_ex_func : 0;

    if (r != NULL)

        *r = (realloc_ex_func != default_realloc_ex) ? realloc_ex_func : 0;

    if (f != NULL)

        *f = free_func;

}

void CRYPTO_get_locked_mem_functions(void *(**m) (size_t),

                                     void (**f) (void *))

{

    if (m != NULL)

        *m = (malloc_locked_ex_func == default_malloc_locked_ex) ?

            malloc_locked_func : 0;

    if (f != NULL)

        *f = free_locked_func;

}

void CRYPTO_get_locked_mem_ex_functions(void

                                        *(**m) (size_t, const char *, int),

                                        void (**f) (void *))

{

    if (m != NULL)

        *m = (malloc_locked_ex_func != default_malloc_locked_ex) ?

            malloc_locked_ex_func : 0;

    if (f != NULL)

        *f = free_locked_func;

}

void CRYPTO_get_mem_debug_functions(void (**m)

                                     (void *, int, const char *, int, int),

                                    void (**r) (void *, void *, int,

                                                const char *, int, int),

                                    void (**f) (void *, int),

                                    void (**so) (long), long (**go) (void))

{

    if (m != NULL)

        *m = malloc_debug_func;

    if (r != NULL)

        *r = realloc_debug_func;

    if (f != NULL)

        *f = free_debug_func;

    if (so != NULL)

        *so = set_debug_options_func;

    if (go != NULL)

        *go = get_debug_options_func;

}

void *CRYPTO_malloc_locked(int num, const char *file, int line)

{

    void *ret = NULL;

    if (num <= 0)

        return NULL;

    if (allow_customize)

        allow_customize = 0;

    if (malloc_debug_func != NULL) {

        if (allow_customize_debug)

            allow_customize_debug = 0;

        malloc_debug_func(NULL, num, file, line, 0);

    }

    ret = malloc_locked_ex_func(num, file, line);

#ifdef LEVITTE_DEBUG_MEM

    fprintf(stderr, "LEVITTE_DEBUG_MEM:         > 0x%p (%d)\n", ret, num);

#endif

    if (malloc_debug_func != NULL)

        malloc_debug_func(ret, num, file, line, 1);

    return ret;

}

void CRYPTO_free_locked(void *str)

{

    if (free_debug_func != NULL)

        free_debug_func(str, 0);

#ifdef LEVITTE_DEBUG_MEM

    fprintf(stderr, "LEVITTE_DEBUG_MEM:         < 0x%p\n", str);

#endif

    free_locked_func(str);

    if (free_debug_func != NULL)

        free_debug_func(NULL, 1);

}

void *CRYPTO_malloc(int num, const char *file, int line)

{

    void *ret = NULL;

    if (num <= 0)

        return NULL;

    if (allow_customize)

        allow_customize = 0;

    if (malloc_debug_func != NULL) {

        if (allow_customize_debug)

            allow_customize_debug = 0;

        malloc_debug_func(NULL, num, file, line, 0);

    }

    ret = malloc_ex_func(num, file, line);

#ifdef LEVITTE_DEBUG_MEM

    fprintf(stderr, "LEVITTE_DEBUG_MEM:         > 0x%p (%d)\n", ret, num);

#endif

    if (malloc_debug_func != NULL)

        malloc_debug_func(ret, num, file, line, 1);

    return ret;

}

char *CRYPTO_strdup(const char *str, const char *file, int line)

{

    char *ret = CRYPTO_malloc(strlen(str) + 1, file, line);

    if (ret == NULL)

        return NULL;

    strcpy(ret, str);

    return ret;

}

void *CRYPTO_realloc(void *str, int num, const char *file, int line)

{

    void *ret = NULL;

    if (str == NULL)

        return CRYPTO_malloc(num, file, line);

    if (num <= 0)

        return NULL;

    if (realloc_debug_func != NULL)

        realloc_debug_func(str, NULL, num, file, line, 0);

    ret = realloc_ex_func(str, num, file, line);

#ifdef LEVITTE_DEBUG_MEM

    fprintf(stderr, "LEVITTE_DEBUG_MEM:         | 0x%p -> 0x%p (%d)\n", str,

            ret, num);

#endif

    if (realloc_debug_func != NULL)

        realloc_debug_func(str, ret, num, file, line, 1);

    return ret;

}

void *CRYPTO_realloc_clean(void *str, int old_len, int num, const char *file,

                           int line)

{

    void *ret = NULL;

    if (str == NULL)

        return CRYPTO_malloc(num, file, line);

    if (num <= 0)

        return NULL;

    /*

     * We don't support shrinking the buffer. Note the memcpy that copies

     * |old_len| bytes to the new buffer, below.

     */

    if (num < old_len)

        return NULL;

    if (realloc_debug_func != NULL)

        realloc_debug_func(str, NULL, num, file, line, 0);

    ret = malloc_ex_func(num, file, line);

    if (ret) {

        memcpy(ret, str, old_len);

        OPENSSL_cleanse(str, old_len);

        free_func(str);

    }

#ifdef LEVITTE_DEBUG_MEM

    fprintf(stderr,

            "LEVITTE_DEBUG_MEM:         | 0x%p -> 0x%p (%d)\n",

            str, ret, num);

#endif

    if (realloc_debug_func != NULL)

        realloc_debug_func(str, ret, num, file, line, 1);

    return ret;

}

void CRYPTO_free(void *str)

{

    if (free_debug_func != NULL)

        free_debug_func(str, 0);

#ifdef LEVITTE_DEBUG_MEM

    fprintf(stderr, "LEVITTE_DEBUG_MEM:         < 0x%p\n", str);

#endif

    free_func(str);

    if (free_debug_func != NULL)

        free_debug_func(NULL, 1);

}

void *CRYPTO_remalloc(void *a, int num, const char *file, int line)

{

    if (a != NULL)

        OPENSSL_free(a);

    a = (char *)OPENSSL_malloc(num);

    return (a);

}

void CRYPTO_set_mem_debug_options(long bits)

{

    if (set_debug_options_func != NULL)

        set_debug_options_func(bits);

}

long CRYPTO_get_mem_debug_options(void)

{

    if (get_debug_options_func != NULL)

        return get_debug_options_func();

    return 0;

}