reactos/dll/3rdparty/mbedtls/platform.c

   1 /*
   2  *  Platform abstraction layer
   3  *
   4  *  Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
   5  *  SPDX-License-Identifier: Apache-2.0
   6  *
   7  *  Licensed under the Apache License, Version 2.0 (the "License"); you may
   8  *  not use this file except in compliance with the License.
   9  *  You may obtain a copy of the License at
  10  *
  11  *  http://www.apache.org/licenses/LICENSE-2.0
  12  *
  13  *  Unless required by applicable law or agreed to in writing, software
  14  *  distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
  15  *  WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  16  *  See the License for the specific language governing permissions and
  17  *  limitations under the License.
  18  *
  19  *  This file is part of mbed TLS (https://tls.mbed.org)
  20  */
  21
  22 #if !defined(MBEDTLS_CONFIG_FILE)
  23 #include "mbedtls/config.h"
  24 #else
  25 #include MBEDTLS_CONFIG_FILE
  26 #endif
  27
  28 #if defined(MBEDTLS_PLATFORM_C)
  29
  30 #include "mbedtls/platform.h"
  31
  32 #if defined(MBEDTLS_PLATFORM_MEMORY)
  33 #if !defined(MBEDTLS_PLATFORM_STD_CALLOC)
  34 static void *platform_calloc_uninit( size_t n, size_t size )
  35 {
  36     ((void) n);
  37     ((void) size);
  38     return( NULL );
  39 }
  40
  41 #define MBEDTLS_PLATFORM_STD_CALLOC   platform_calloc_uninit
  42 #endif /* !MBEDTLS_PLATFORM_STD_CALLOC */
  43
  44 #if !defined(MBEDTLS_PLATFORM_STD_FREE)
  45 static void platform_free_uninit( void *ptr )
  46 {
  47     ((void) ptr);
  48 }
  49
  50 #define MBEDTLS_PLATFORM_STD_FREE     platform_free_uninit
  51 #endif /* !MBEDTLS_PLATFORM_STD_FREE */
  52
  53 void * (*mbedtls_calloc)( size_t, size_t ) = MBEDTLS_PLATFORM_STD_CALLOC;
  54 void (*mbedtls_free)( void * )     = MBEDTLS_PLATFORM_STD_FREE;
  55
  56 int mbedtls_platform_set_calloc_free( void * (*calloc_func)( size_t, size_t ),
  57                               void (*free_func)( void * ) )
  58 {
  59     mbedtls_calloc = calloc_func;
  60     mbedtls_free = free_func;
  61     return( 0 );
  62 }
  63 #endif /* MBEDTLS_PLATFORM_MEMORY */
  64
  65 #if defined(_WIN32)
  66 #include <stdarg.h>
  67 int mbedtls_platform_win32_snprintf( char *s, size_t n, const char *fmt, ... )
  68 {
  69     int ret;
  70     va_list argp;
  71
  72     /* Avoid calling the invalid parameter handler by checking ourselves */
  73     if( s == NULL || n == 0 || fmt == NULL )
  74         return( -1 );
  75
  76     va_start( argp, fmt );
  77 #if defined(_TRUNCATE)
  78     ret = _vsnprintf_s( s, n, _TRUNCATE, fmt, argp );
  79 #else
  80     ret = _vsnprintf( s, n, fmt, argp );
  81     if( ret < 0 || (size_t) ret == n )
  82     {
  83         s[n-1] = '\0';
  84         ret = -1;
  85     }
  86 #endif
  87     va_end( argp );
  88
  89     return( ret );
  90 }
  91 #endif
  92
  93 #if defined(MBEDTLS_PLATFORM_SNPRINTF_ALT)
  94 #if !defined(MBEDTLS_PLATFORM_STD_SNPRINTF)
  95 /*
  96  * Make dummy function to prevent NULL pointer dereferences
  97  */
  98 static int platform_snprintf_uninit( char * s, size_t n,
  99                                      const char * format, ... )
 100 {
 101     ((void) s);
 102     ((void) n);
 103     ((void) format);
 104     return( 0 );
 105 }
 106
 107 #define MBEDTLS_PLATFORM_STD_SNPRINTF    platform_snprintf_uninit
 108 #endif /* !MBEDTLS_PLATFORM_STD_SNPRINTF */
 109
 110 int (*mbedtls_snprintf)( char * s, size_t n,
 111                           const char * format,
 112                           ... ) = MBEDTLS_PLATFORM_STD_SNPRINTF;
 113
 114 int mbedtls_platform_set_snprintf( int (*snprintf_func)( char * s, size_t n,
 115                                                  const char * format,
 116                                                  ... ) )
 117 {
 118     mbedtls_snprintf = snprintf_func;
 119     return( 0 );
 120 }
 121 #endif /* MBEDTLS_PLATFORM_SNPRINTF_ALT */
 122
 123 #if defined(MBEDTLS_PLATFORM_PRINTF_ALT)
 124 #if !defined(MBEDTLS_PLATFORM_STD_PRINTF)
 125 /*
 126  * Make dummy function to prevent NULL pointer dereferences
 127  */
 128 static int platform_printf_uninit( const char *format, ... )
 129 {
 130     ((void) format);
 131     return( 0 );
 132 }
 133
 134 #define MBEDTLS_PLATFORM_STD_PRINTF    platform_printf_uninit
 135 #endif /* !MBEDTLS_PLATFORM_STD_PRINTF */
 136
 137 int (*mbedtls_printf)( const char *, ... ) = MBEDTLS_PLATFORM_STD_PRINTF;
 138
 139 int mbedtls_platform_set_printf( int (*printf_func)( const char *, ... ) )
 140 {
 141     mbedtls_printf = printf_func;
 142     return( 0 );
 143 }
 144 #endif /* MBEDTLS_PLATFORM_PRINTF_ALT */
 145
 146 #if defined(MBEDTLS_PLATFORM_FPRINTF_ALT)
 147 #if !defined(MBEDTLS_PLATFORM_STD_FPRINTF)
 148 /*
 149  * Make dummy function to prevent NULL pointer dereferences
 150  */
 151 static int platform_fprintf_uninit( FILE *stream, const char *format, ... )
 152 {
 153     ((void) stream);
 154     ((void) format);
 155     return( 0 );
 156 }
 157
 158 #define MBEDTLS_PLATFORM_STD_FPRINTF   platform_fprintf_uninit
 159 #endif /* !MBEDTLS_PLATFORM_STD_FPRINTF */
 160
 161 int (*mbedtls_fprintf)( FILE *, const char *, ... ) =
 162                                         MBEDTLS_PLATFORM_STD_FPRINTF;
 163
 164 int mbedtls_platform_set_fprintf( int (*fprintf_func)( FILE *, const char *, ... ) )
 165 {
 166     mbedtls_fprintf = fprintf_func;
 167     return( 0 );
 168 }
 169 #endif /* MBEDTLS_PLATFORM_FPRINTF_ALT */
 170
 171 #if defined(MBEDTLS_PLATFORM_EXIT_ALT)
 172 #if !defined(MBEDTLS_PLATFORM_STD_EXIT)
 173 /*
 174  * Make dummy function to prevent NULL pointer dereferences
 175  */
 176 static void platform_exit_uninit( int status )
 177 {
 178     ((void) status);
 179 }
 180
 181 #define MBEDTLS_PLATFORM_STD_EXIT   platform_exit_uninit
 182 #endif /* !MBEDTLS_PLATFORM_STD_EXIT */
 183
 184 void (*mbedtls_exit)( int status ) = MBEDTLS_PLATFORM_STD_EXIT;
 185
 186 int mbedtls_platform_set_exit( void (*exit_func)( int status ) )
 187 {
 188     mbedtls_exit = exit_func;
 189     return( 0 );
 190 }
 191 #endif /* MBEDTLS_PLATFORM_EXIT_ALT */
 192
 193 #if defined(MBEDTLS_PLATFORM_TIME_ALT)
 194 #if !defined(MBEDTLS_PLATFORM_STD_TIME)
 195 /*
 196  * Make dummy function to prevent NULL pointer dereferences
 197  */
 198 static mbedtls_time_t platform_time_uninit( mbedtls_time_t* timer )
 199 {
 200     ((void) timer);
 201     return( 0 );
 202 }
 203
 204 #define MBEDTLS_PLATFORM_STD_TIME   platform_time_uninit
 205 #endif /* !MBEDTLS_PLATFORM_STD_TIME */
 206
 207 mbedtls_time_t (*mbedtls_time)( mbedtls_time_t* timer ) = MBEDTLS_PLATFORM_STD_TIME;
 208
 209 int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* timer ) )
 210 {
 211     mbedtls_time = time_func;
 212     return( 0 );
 213 }
 214 #endif /* MBEDTLS_PLATFORM_TIME_ALT */
 215
 216 #if defined(MBEDTLS_ENTROPY_NV_SEED)
 217 #if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
 218 /* Default implementations for the platform independent seed functions use
 219  * standard libc file functions to read from and write to a pre-defined filename
 220  */
 221 int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len )
 222 {
 223     FILE *file;
 224     size_t n;
 225
 226     if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb" ) ) == NULL )
 227         return -1;
 228
 229     if( ( n = fread( buf, 1, buf_len, file ) ) != buf_len )
 230     {
 231         fclose( file );
 232         return -1;
 233     }
 234
 235     fclose( file );
 236     return( n );
 237 }
 238
 239 int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len )
 240 {
 241     FILE *file;
 242     size_t n;
 243
 244     if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w" ) ) == NULL )
 245         return -1;
 246
 247     if( ( n = fwrite( buf, 1, buf_len, file ) ) != buf_len )
 248     {
 249         fclose( file );
 250         return -1;
 251     }
 252
 253     fclose( file );
 254     return( n );
 255 }
 256 #endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
 257
 258 #if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
 259 #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ)
 260 /*
 261  * Make dummy function to prevent NULL pointer dereferences
 262  */
 263 static int platform_nv_seed_read_uninit( unsigned char *buf, size_t buf_len )
 264 {
 265     ((void) buf);
 266     ((void) buf_len);
 267     return( -1 );
 268 }
 269
 270 #define MBEDTLS_PLATFORM_STD_NV_SEED_READ   platform_nv_seed_read_uninit
 271 #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_READ */
 272
 273 #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE)
 274 /*
 275  * Make dummy function to prevent NULL pointer dereferences
 276  */
 277 static int platform_nv_seed_write_uninit( unsigned char *buf, size_t buf_len )
 278 {
 279     ((void) buf);
 280     ((void) buf_len);
 281     return( -1 );
 282 }
 283
 284 #define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE   platform_nv_seed_write_uninit
 285 #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_WRITE */
 286
 287 int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len ) =
 288             MBEDTLS_PLATFORM_STD_NV_SEED_READ;
 289 int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len ) =
 290             MBEDTLS_PLATFORM_STD_NV_SEED_WRITE;
 291
 292 int mbedtls_platform_set_nv_seed(
 293         int (*nv_seed_read_func)( unsigned char *buf, size_t buf_len ),
 294         int (*nv_seed_write_func)( unsigned char *buf, size_t buf_len ) )
 295 {
 296     mbedtls_nv_seed_read = nv_seed_read_func;
 297     mbedtls_nv_seed_write = nv_seed_write_func;
 298     return( 0 );
 299 }
 300 #endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
 301 #endif /* MBEDTLS_ENTROPY_NV_SEED */
 302
 303 #endif /* MBEDTLS_PLATFORM_C */