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/*
* Copyright (C) 2001 Nikos Mavroyanopoulos
*
* This file is part of GNUTLS.
*
* GNUTLS is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* GNUTLS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
#include <gnutls_int.h>
#include <gnutls_errors.h>
#include <gnutls_num.h>
#ifdef USE_DMALLOC
int _gnutls_is_secure_memory(const void *ign)
{
return 0;
}
#else
/* #define MALLOC_DEBUG */
# define EXTRA_SIZE sizeof(size_t)+1
int _gnutls_is_secure_memory(const svoid * mem)
{
return *((opaque *) mem - 1);
}
void *gnutls_malloc(size_t size)
{
opaque *ret;
if (size == 0)
return NULL;
ret = malloc(size + EXTRA_SIZE);
if (ret == NULL)
return ret;
*((int *) ret) = size;
ret[sizeof(size_t)] = 0; /* not secure */
ret += EXTRA_SIZE;
#ifdef MALLOC_DEBUG
_gnutls_log("Allocated: %x with %d bytes\n", ret,
_gnutls_malloc_ptr_size(ret));
#endif
return ret;
}
void *gnutls_calloc(size_t nmemb, size_t size)
{
void *ret;
ret = gnutls_malloc(size);
if (ret == NULL)
return ret;
memset(ret, 0, size);
return ret;
}
size_t _gnutls_malloc_ptr_size(void *_ptr)
{
opaque *ptr = _ptr;
if (_ptr == NULL)
return 0;
return *((int *) ((opaque *) ptr - sizeof(size_t) - 1));
}
void *gnutls_realloc(void *_ptr, size_t size)
{
opaque *ret;
opaque* ptr = _ptr;
if (ptr!=NULL)
ptr -= EXTRA_SIZE;
ret = realloc(ptr, size + EXTRA_SIZE);
if (ret == NULL)
return ret;
*((int *) ret) = size;
ret[sizeof(size_t)] = 0; /* not secure */
ret += EXTRA_SIZE;
return ret;
}
void *gnutls_realloc_fast(void *ptr, size_t size)
{
if (ptr != NULL && size <= _gnutls_malloc_ptr_size(ptr)) {
/* do nothing, just return the pointer.
* It's much faster.
*/
return ptr;
}
return gnutls_realloc(ptr, size);
}
void gnutls_free(void *_ptr)
{
opaque *ptr = _ptr;
if (_ptr == NULL)
return;
ptr -= EXTRA_SIZE;
#ifdef MALLOC_DEBUG
_gnutls_log("Freed: %x with %d bytes\n", _ptr,
_gnutls_malloc_ptr_size(_ptr));
#endif
free(ptr);
}
svoid *secure_malloc(size_t size)
{
opaque *ret;
ret = gnutls_malloc(size);
if (ret == NULL)
return ret;
*((opaque *) ret - 1) = 1; /* secure mem */
return ret;
}
svoid *secure_calloc(size_t nmemb, size_t size)
{
svoid *ret;
ret = secure_malloc(size);
if (ret == NULL)
return ret;
memset(ret, 0, size);
return ret;
}
size_t _secure_ptr_size(svoid * ptr)
{
return _gnutls_malloc_ptr_size(ptr);
}
svoid *secure_realloc(svoid * ptr, size_t size)
{
svoid *ret;
if (ptr != NULL && size <= _secure_ptr_size(ptr)) {
/* do not do realloc.
* return the previous pointer.
*/
return ptr;
}
ret = secure_malloc(size);
if (ret == NULL)
return ret;
if (ptr != NULL) {
memcpy(ret, ptr, GMIN(_secure_ptr_size(ptr), size));
secure_free(ptr);
}
return ret;
}
void secure_free(svoid * ptr)
{
memset(ptr, 0, _secure_ptr_size(ptr));
gnutls_free(ptr);
}
char *gnutls_strdup(const char *s)
{
int size = strlen(s);
char *ret;
ret = gnutls_malloc(size + 1); /* hold null */
if (ret == NULL)
return ret;
strcpy(ret, s);
return ret;
}
#endif /* USE_DMALLOC */
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