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/*
* Platform abstraction layer
*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "common.h"
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
/* The compile time configuration of memory allocation via the macros
* MBEDTLS_PLATFORM_{FREE/CALLOC}_MACRO takes precedence over the runtime
* configuration via mbedtls_platform_set_calloc_free(). So, omit everything
* related to the latter if MBEDTLS_PLATFORM_{FREE/CALLOC}_MACRO are defined. */
#if defined(MBEDTLS_PLATFORM_MEMORY) && \
!( defined(MBEDTLS_PLATFORM_CALLOC_MACRO) && \
defined(MBEDTLS_PLATFORM_FREE_MACRO) )
#if !defined(MBEDTLS_PLATFORM_STD_CALLOC)
static void *platform_calloc_uninit( size_t n, size_t size )
{
((void) n);
((void) size);
return( NULL );
}
#define MBEDTLS_PLATFORM_STD_CALLOC platform_calloc_uninit
#endif /* !MBEDTLS_PLATFORM_STD_CALLOC */
#if !defined(MBEDTLS_PLATFORM_STD_FREE)
static void platform_free_uninit( void *ptr )
{
((void) ptr);
}
#define MBEDTLS_PLATFORM_STD_FREE platform_free_uninit
#endif /* !MBEDTLS_PLATFORM_STD_FREE */
static void * (*mbedtls_calloc_func)( size_t, size_t ) = MBEDTLS_PLATFORM_STD_CALLOC;
static void (*mbedtls_free_func)( void * ) = MBEDTLS_PLATFORM_STD_FREE;
void * mbedtls_calloc( size_t nmemb, size_t size )
{
return (*mbedtls_calloc_func)( nmemb, size );
}
void mbedtls_free( void * ptr )
{
(*mbedtls_free_func)( ptr );
}
int mbedtls_platform_set_calloc_free( void * (*calloc_func)( size_t, size_t ),
void (*free_func)( void * ) )
{
mbedtls_calloc_func = calloc_func;
mbedtls_free_func = free_func;
return( 0 );
}
#endif /* MBEDTLS_PLATFORM_MEMORY &&
!( defined(MBEDTLS_PLATFORM_CALLOC_MACRO) &&
defined(MBEDTLS_PLATFORM_FREE_MACRO) ) */
#if defined(MBEDTLS_PLATFORM_HAS_NON_CONFORMING_SNPRINTF)
#include <stdarg.h>
int mbedtls_platform_win32_snprintf( char *s, size_t n, const char *fmt, ... )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
va_list argp;
va_start( argp, fmt );
ret = mbedtls_vsnprintf( s, n, fmt, argp );
va_end( argp );
return( ret );
}
#endif
#if defined(MBEDTLS_PLATFORM_SNPRINTF_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_SNPRINTF)
/*
* Make dummy function to prevent NULL pointer dereferences
*/
static int platform_snprintf_uninit( char * s, size_t n,
const char * format, ... )
{
((void) s);
((void) n);
((void) format);
return( 0 );
}
#define MBEDTLS_PLATFORM_STD_SNPRINTF platform_snprintf_uninit
#endif /* !MBEDTLS_PLATFORM_STD_SNPRINTF */
int (*mbedtls_snprintf)( char * s, size_t n,
const char * format,
... ) = MBEDTLS_PLATFORM_STD_SNPRINTF;
int mbedtls_platform_set_snprintf( int (*snprintf_func)( char * s, size_t n,
const char * format,
... ) )
{
mbedtls_snprintf = snprintf_func;
return( 0 );
}
#endif /* MBEDTLS_PLATFORM_SNPRINTF_ALT */
#if defined(MBEDTLS_PLATFORM_HAS_NON_CONFORMING_VSNPRINTF)
#include <stdarg.h>
int mbedtls_platform_win32_vsnprintf( char *s, size_t n, const char *fmt, va_list arg )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
/* Avoid calling the invalid parameter handler by checking ourselves */
if( s == NULL || n == 0 || fmt == NULL )
return( -1 );
#if defined(_TRUNCATE)
ret = vsnprintf_s( s, n, _TRUNCATE, fmt, arg );
#else
ret = vsnprintf( s, n, fmt, arg );
if( ret < 0 || (size_t) ret == n )
{
s[n-1] = '\0';
ret = -1;
}
#endif
return( ret );
}
#endif
#if defined(MBEDTLS_PLATFORM_VSNPRINTF_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_VSNPRINTF)
/*
* Make dummy function to prevent NULL pointer dereferences
*/
static int platform_vsnprintf_uninit( char * s, size_t n,
const char * format, va_list arg )
{
((void) s);
((void) n);
((void) format);
((void) arg);
return( -1 );
}
#define MBEDTLS_PLATFORM_STD_VSNPRINTF platform_vsnprintf_uninit
#endif /* !MBEDTLS_PLATFORM_STD_VSNPRINTF */
int (*mbedtls_vsnprintf)( char * s, size_t n,
const char * format,
va_list arg ) = MBEDTLS_PLATFORM_STD_VSNPRINTF;
int mbedtls_platform_set_vsnprintf( int (*vsnprintf_func)( char * s, size_t n,
const char * format,
va_list arg ) )
{
mbedtls_vsnprintf = vsnprintf_func;
return( 0 );
}
#endif /* MBEDTLS_PLATFORM_VSNPRINTF_ALT */
#if defined(MBEDTLS_PLATFORM_PRINTF_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_PRINTF)
/*
* Make dummy function to prevent NULL pointer dereferences
*/
static int platform_printf_uninit( const char *format, ... )
{
((void) format);
return( 0 );
}
#define MBEDTLS_PLATFORM_STD_PRINTF platform_printf_uninit
#endif /* !MBEDTLS_PLATFORM_STD_PRINTF */
int (*mbedtls_printf)( const char *, ... ) = MBEDTLS_PLATFORM_STD_PRINTF;
int mbedtls_platform_set_printf( int (*printf_func)( const char *, ... ) )
{
mbedtls_printf = printf_func;
return( 0 );
}
#endif /* MBEDTLS_PLATFORM_PRINTF_ALT */
#if defined(MBEDTLS_PLATFORM_FPRINTF_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_FPRINTF)
/*
* Make dummy function to prevent NULL pointer dereferences
*/
static int platform_fprintf_uninit( FILE *stream, const char *format, ... )
{
((void) stream);
((void) format);
return( 0 );
}
#define MBEDTLS_PLATFORM_STD_FPRINTF platform_fprintf_uninit
#endif /* !MBEDTLS_PLATFORM_STD_FPRINTF */
int (*mbedtls_fprintf)( FILE *, const char *, ... ) =
MBEDTLS_PLATFORM_STD_FPRINTF;
int mbedtls_platform_set_fprintf( int (*fprintf_func)( FILE *, const char *, ... ) )
{
mbedtls_fprintf = fprintf_func;
return( 0 );
}
#endif /* MBEDTLS_PLATFORM_FPRINTF_ALT */
#if defined(MBEDTLS_PLATFORM_EXIT_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_EXIT)
/*
* Make dummy function to prevent NULL pointer dereferences
*/
static void platform_exit_uninit( int status )
{
((void) status);
}
#define MBEDTLS_PLATFORM_STD_EXIT platform_exit_uninit
#endif /* !MBEDTLS_PLATFORM_STD_EXIT */
void (*mbedtls_exit)( int status ) = MBEDTLS_PLATFORM_STD_EXIT;
int mbedtls_platform_set_exit( void (*exit_func)( int status ) )
{
mbedtls_exit = exit_func;
return( 0 );
}
#endif /* MBEDTLS_PLATFORM_EXIT_ALT */
#if defined(MBEDTLS_HAVE_TIME)
#if defined(MBEDTLS_PLATFORM_TIME_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_TIME)
/*
* Make dummy function to prevent NULL pointer dereferences
*/
static mbedtls_time_t platform_time_uninit( mbedtls_time_t* timer )
{
((void) timer);
return( 0 );
}
#define MBEDTLS_PLATFORM_STD_TIME platform_time_uninit
#endif /* !MBEDTLS_PLATFORM_STD_TIME */
mbedtls_time_t (*mbedtls_time)( mbedtls_time_t* timer ) = MBEDTLS_PLATFORM_STD_TIME;
int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* timer ) )
{
mbedtls_time = time_func;
return( 0 );
}
#endif /* MBEDTLS_PLATFORM_TIME_ALT */
#endif /* MBEDTLS_HAVE_TIME */
#if defined(MBEDTLS_ENTROPY_NV_SEED)
#if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
/* Default implementations for the platform independent seed functions use
* standard libc file functions to read from and write to a pre-defined filename
*/
int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len )
{
FILE *file;
size_t n;
if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb" ) ) == NULL )
return( -1 );
if( ( n = fread( buf, 1, buf_len, file ) ) != buf_len )
{
fclose( file );
mbedtls_platform_zeroize( buf, buf_len );
return( -1 );
}
fclose( file );
return( (int)n );
}
int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len )
{
FILE *file;
size_t n;
if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w" ) ) == NULL )
return -1;
if( ( n = fwrite( buf, 1, buf_len, file ) ) != buf_len )
{
fclose( file );
return -1;
}
fclose( file );
return( (int)n );
}
#endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
#if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ)
/*
* Make dummy function to prevent NULL pointer dereferences
*/
static int platform_nv_seed_read_uninit( unsigned char *buf, size_t buf_len )
{
((void) buf);
((void) buf_len);
return( -1 );
}
#define MBEDTLS_PLATFORM_STD_NV_SEED_READ platform_nv_seed_read_uninit
#endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_READ */
#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE)
/*
* Make dummy function to prevent NULL pointer dereferences
*/
static int platform_nv_seed_write_uninit( unsigned char *buf, size_t buf_len )
{
((void) buf);
((void) buf_len);
return( -1 );
}
#define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE platform_nv_seed_write_uninit
#endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_WRITE */
int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len ) =
MBEDTLS_PLATFORM_STD_NV_SEED_READ;
int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len ) =
MBEDTLS_PLATFORM_STD_NV_SEED_WRITE;
int mbedtls_platform_set_nv_seed(
int (*nv_seed_read_func)( unsigned char *buf, size_t buf_len ),
int (*nv_seed_write_func)( unsigned char *buf, size_t buf_len ) )
{
mbedtls_nv_seed_read = nv_seed_read_func;
mbedtls_nv_seed_write = nv_seed_write_func;
return( 0 );
}
#endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
#endif /* MBEDTLS_ENTROPY_NV_SEED */
#if !defined(MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT)
/*
* Placeholder platform setup that does nothing by default
*/
int mbedtls_platform_setup( mbedtls_platform_context *ctx )
{
(void)ctx;
return( 0 );
}
/*
* Placeholder platform teardown that does nothing by default
*/
void mbedtls_platform_teardown( mbedtls_platform_context *ctx )
{
(void)ctx;
}
#endif /* MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT */
#endif /* MBEDTLS_PLATFORM_C */
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