346 lines
9.5 KiB
C
346 lines
9.5 KiB
C
/*
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* Platform abstraction layer
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*
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* Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*
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* This file is part of mbed TLS (https://tls.mbed.org)
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*/
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#if !defined(MBEDTLS_CONFIG_FILE)
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#include "mbedtls/config.h"
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#else
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#include MBEDTLS_CONFIG_FILE
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#endif
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#if defined(MBEDTLS_PLATFORM_C)
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#include "mbedtls/platform.h"
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#if defined(MBEDTLS_ENTROPY_NV_SEED) && \
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!defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
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/* Implementation that should never be optimized out by the compiler */
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static void mbedtls_zeroize( void *v, size_t n ) {
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volatile unsigned char *p = (unsigned char*)v; while( n-- ) *p++ = 0;
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}
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#endif
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/* The compile time configuration of memory allocation via the macros
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* MBEDTLS_PLATFORM_{FREE/CALLOC}_MACRO takes precedence over the runtime
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* configuration via mbedtls_platform_set_calloc_free(). So, omit everything
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* related to the latter if MBEDTLS_PLATFORM_{FREE/CALLOC}_MACRO are defined. */
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#if defined(MBEDTLS_PLATFORM_MEMORY) && \
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!( defined(MBEDTLS_PLATFORM_CALLOC_MACRO) && \
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defined(MBEDTLS_PLATFORM_FREE_MACRO) )
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#if !defined(MBEDTLS_PLATFORM_STD_CALLOC)
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static void *platform_calloc_uninit( size_t n, size_t size )
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{
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((void) n);
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((void) size);
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return( NULL );
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}
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#define MBEDTLS_PLATFORM_STD_CALLOC platform_calloc_uninit
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#endif /* !MBEDTLS_PLATFORM_STD_CALLOC */
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#if !defined(MBEDTLS_PLATFORM_STD_FREE)
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static void platform_free_uninit( void *ptr )
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{
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((void) ptr);
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}
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#define MBEDTLS_PLATFORM_STD_FREE platform_free_uninit
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#endif /* !MBEDTLS_PLATFORM_STD_FREE */
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void * (*mbedtls_calloc)( size_t, size_t ) = MBEDTLS_PLATFORM_STD_CALLOC;
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void (*mbedtls_free)( void * ) = MBEDTLS_PLATFORM_STD_FREE;
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int mbedtls_platform_set_calloc_free( void * (*calloc_func)( size_t, size_t ),
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void (*free_func)( void * ) )
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{
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mbedtls_calloc = calloc_func;
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mbedtls_free = free_func;
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return( 0 );
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}
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#endif /* MBEDTLS_PLATFORM_MEMORY &&
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!( defined(MBEDTLS_PLATFORM_CALLOC_MACRO) &&
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defined(MBEDTLS_PLATFORM_FREE_MACRO) ) */
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#if defined(_WIN32)
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#include <stdarg.h>
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int mbedtls_platform_win32_snprintf( char *s, size_t n, const char *fmt, ... )
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{
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int ret;
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va_list argp;
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/* Avoid calling the invalid parameter handler by checking ourselves */
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if( s == NULL || n == 0 || fmt == NULL )
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return( -1 );
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va_start( argp, fmt );
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#if defined(_TRUNCATE) && !defined(__MINGW32__)
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ret = _vsnprintf_s( s, n, _TRUNCATE, fmt, argp );
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#else
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ret = _vsnprintf( s, n, fmt, argp );
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if( ret < 0 || (size_t) ret == n )
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{
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s[n-1] = '\0';
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ret = -1;
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}
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#endif
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va_end( argp );
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return( ret );
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}
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#endif
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#if defined(MBEDTLS_PLATFORM_SNPRINTF_ALT)
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#if !defined(MBEDTLS_PLATFORM_STD_SNPRINTF)
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/*
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* Make dummy function to prevent NULL pointer dereferences
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*/
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static int platform_snprintf_uninit( char * s, size_t n,
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const char * format, ... )
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{
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((void) s);
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((void) n);
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((void) format);
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return( 0 );
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}
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#define MBEDTLS_PLATFORM_STD_SNPRINTF platform_snprintf_uninit
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#endif /* !MBEDTLS_PLATFORM_STD_SNPRINTF */
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int (*mbedtls_snprintf)( char * s, size_t n,
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const char * format,
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... ) = MBEDTLS_PLATFORM_STD_SNPRINTF;
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int mbedtls_platform_set_snprintf( int (*snprintf_func)( char * s, size_t n,
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const char * format,
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... ) )
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{
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mbedtls_snprintf = snprintf_func;
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return( 0 );
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}
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#endif /* MBEDTLS_PLATFORM_SNPRINTF_ALT */
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#if defined(MBEDTLS_PLATFORM_PRINTF_ALT)
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#if !defined(MBEDTLS_PLATFORM_STD_PRINTF)
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/*
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* Make dummy function to prevent NULL pointer dereferences
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*/
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static int platform_printf_uninit( const char *format, ... )
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{
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((void) format);
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return( 0 );
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}
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#define MBEDTLS_PLATFORM_STD_PRINTF platform_printf_uninit
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#endif /* !MBEDTLS_PLATFORM_STD_PRINTF */
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int (*mbedtls_printf)( const char *, ... ) = MBEDTLS_PLATFORM_STD_PRINTF;
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int mbedtls_platform_set_printf( int (*printf_func)( const char *, ... ) )
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{
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mbedtls_printf = printf_func;
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return( 0 );
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}
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#endif /* MBEDTLS_PLATFORM_PRINTF_ALT */
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#if defined(MBEDTLS_PLATFORM_FPRINTF_ALT)
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#if !defined(MBEDTLS_PLATFORM_STD_FPRINTF)
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/*
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* Make dummy function to prevent NULL pointer dereferences
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*/
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static int platform_fprintf_uninit( FILE *stream, const char *format, ... )
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{
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((void) stream);
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((void) format);
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return( 0 );
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}
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#define MBEDTLS_PLATFORM_STD_FPRINTF platform_fprintf_uninit
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#endif /* !MBEDTLS_PLATFORM_STD_FPRINTF */
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int (*mbedtls_fprintf)( FILE *, const char *, ... ) =
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MBEDTLS_PLATFORM_STD_FPRINTF;
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int mbedtls_platform_set_fprintf( int (*fprintf_func)( FILE *, const char *, ... ) )
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{
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mbedtls_fprintf = fprintf_func;
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return( 0 );
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}
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#endif /* MBEDTLS_PLATFORM_FPRINTF_ALT */
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#if defined(MBEDTLS_PLATFORM_EXIT_ALT)
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#if !defined(MBEDTLS_PLATFORM_STD_EXIT)
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/*
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* Make dummy function to prevent NULL pointer dereferences
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*/
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static void platform_exit_uninit( int status )
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{
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((void) status);
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}
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#define MBEDTLS_PLATFORM_STD_EXIT platform_exit_uninit
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#endif /* !MBEDTLS_PLATFORM_STD_EXIT */
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void (*mbedtls_exit)( int status ) = MBEDTLS_PLATFORM_STD_EXIT;
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int mbedtls_platform_set_exit( void (*exit_func)( int status ) )
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{
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mbedtls_exit = exit_func;
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return( 0 );
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}
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#endif /* MBEDTLS_PLATFORM_EXIT_ALT */
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#if defined(MBEDTLS_HAVE_TIME)
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#if defined(MBEDTLS_PLATFORM_TIME_ALT)
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#if !defined(MBEDTLS_PLATFORM_STD_TIME)
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/*
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* Make dummy function to prevent NULL pointer dereferences
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*/
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static mbedtls_time_t platform_time_uninit( mbedtls_time_t* timer )
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{
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((void) timer);
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return( 0 );
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}
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#define MBEDTLS_PLATFORM_STD_TIME platform_time_uninit
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#endif /* !MBEDTLS_PLATFORM_STD_TIME */
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mbedtls_time_t (*mbedtls_time)( mbedtls_time_t* timer ) = MBEDTLS_PLATFORM_STD_TIME;
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int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* timer ) )
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{
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mbedtls_time = time_func;
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return( 0 );
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}
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#endif /* MBEDTLS_PLATFORM_TIME_ALT */
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#endif /* MBEDTLS_HAVE_TIME */
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#if defined(MBEDTLS_ENTROPY_NV_SEED)
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#if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
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/* Default implementations for the platform independent seed functions use
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* standard libc file functions to read from and write to a pre-defined filename
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*/
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int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len )
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{
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FILE *file;
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size_t n;
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if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb" ) ) == NULL )
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return( -1 );
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if( ( n = fread( buf, 1, buf_len, file ) ) != buf_len )
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{
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fclose( file );
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mbedtls_zeroize( buf, buf_len );
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return( -1 );
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}
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fclose( file );
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return( (int)n );
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}
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int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len )
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{
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FILE *file;
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size_t n;
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if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w" ) ) == NULL )
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return -1;
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if( ( n = fwrite( buf, 1, buf_len, file ) ) != buf_len )
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{
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fclose( file );
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return -1;
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}
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fclose( file );
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return( (int)n );
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}
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#endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
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#if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
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#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ)
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/*
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* Make dummy function to prevent NULL pointer dereferences
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*/
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static int platform_nv_seed_read_uninit( unsigned char *buf, size_t buf_len )
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{
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((void) buf);
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((void) buf_len);
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return( -1 );
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}
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#define MBEDTLS_PLATFORM_STD_NV_SEED_READ platform_nv_seed_read_uninit
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#endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_READ */
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#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE)
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/*
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* Make dummy function to prevent NULL pointer dereferences
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*/
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static int platform_nv_seed_write_uninit( unsigned char *buf, size_t buf_len )
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{
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((void) buf);
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((void) buf_len);
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return( -1 );
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}
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#define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE platform_nv_seed_write_uninit
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#endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_WRITE */
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int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len ) =
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MBEDTLS_PLATFORM_STD_NV_SEED_READ;
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int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len ) =
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MBEDTLS_PLATFORM_STD_NV_SEED_WRITE;
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int mbedtls_platform_set_nv_seed(
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int (*nv_seed_read_func)( unsigned char *buf, size_t buf_len ),
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int (*nv_seed_write_func)( unsigned char *buf, size_t buf_len ) )
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{
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mbedtls_nv_seed_read = nv_seed_read_func;
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mbedtls_nv_seed_write = nv_seed_write_func;
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return( 0 );
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}
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#endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
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#endif /* MBEDTLS_ENTROPY_NV_SEED */
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#if !defined(MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT)
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/*
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* Placeholder platform setup that does nothing by default
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*/
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int mbedtls_platform_setup( mbedtls_platform_context *ctx )
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{
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(void)ctx;
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return( 0 );
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}
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/*
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* Placeholder platform teardown that does nothing by default
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*/
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void mbedtls_platform_teardown( mbedtls_platform_context *ctx )
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{
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(void)ctx;
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}
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#endif /* MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT */
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#endif /* MBEDTLS_PLATFORM_C */
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