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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) {
void* ret;
if ( ptr != NULL && size <= _gnutls_malloc_ptr_size(ptr)) {
/* do nothing, just return the pointer.
* It's much faster.
*/
return ptr;
}
ret = gnutls_malloc( size);
if (ret==NULL) return ret;
if (ptr!=NULL) {
memcpy( ret, ptr, GMIN( _gnutls_malloc_ptr_size(ptr), size));
gnutls_free(ptr);
}
return ret;
}
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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