git.zerfleddert.de Git - proxmark3-svn/blob - common/mbedtls/platform.c

   1 /*
   2  *  Platform abstraction layer
   3  *
   4  *  Copyright (C) 2006-2016, ARM Limited, All Rights Reserved
   5  *  SPDX-License-Identifier: GPL-2.0
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2 of the License, or
  10  *  (at your option) any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License along
  18  *  with this program; if not, write to the Free Software Foundation, Inc.,
  19  *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  *  This file is part of mbed TLS (https://tls.mbed.org)
  22  */
  23
  24 #if !defined(MBEDTLS_CONFIG_FILE)
  25 #include "mbedtls/config.h"
  26 #else
  27 #include MBEDTLS_CONFIG_FILE
  28 #endif
  29
  30 #if defined(MBEDTLS_PLATFORM_C)
  31
  32 #include "mbedtls/platform.h"
  33 #include "mbedtls/platform_util.h"
  34
  35 #if defined(MBEDTLS_PLATFORM_MEMORY)
  36 #if !defined(MBEDTLS_PLATFORM_STD_CALLOC)
  37 static void *platform_calloc_uninit( size_t n, size_t size )
  38 {
  39     ((void) n);
  40     ((void) size);
  41     return( NULL );
  42 }
  43
  44 #define MBEDTLS_PLATFORM_STD_CALLOC   platform_calloc_uninit
  45 #endif /* !MBEDTLS_PLATFORM_STD_CALLOC */
  46
  47 #if !defined(MBEDTLS_PLATFORM_STD_FREE)
  48 static void platform_free_uninit( void *ptr )
  49 {
  50     ((void) ptr);
  51 }
  52
  53 #define MBEDTLS_PLATFORM_STD_FREE     platform_free_uninit
  54 #endif /* !MBEDTLS_PLATFORM_STD_FREE */
  55
  56 static void * (*mbedtls_calloc_func)( size_t, size_t ) = MBEDTLS_PLATFORM_STD_CALLOC;
  57 static void (*mbedtls_free_func)( void * ) = MBEDTLS_PLATFORM_STD_FREE;
  58
  59 void * mbedtls_calloc( size_t nmemb, size_t size )
  60 {
  61     return (*mbedtls_calloc_func)( nmemb, size );
  62 }
  63
  64 void mbedtls_free( void * ptr )
  65 {
  66     (*mbedtls_free_func)( ptr );
  67 }
  68
  69 int mbedtls_platform_set_calloc_free( void * (*calloc_func)( size_t, size_t ),
  70                               void (*free_func)( void * ) )
  71 {
  72     mbedtls_calloc_func = calloc_func;
  73     mbedtls_free_func = free_func;
  74     return( 0 );
  75 }
  76 #endif /* MBEDTLS_PLATFORM_MEMORY */
  77
  78 #if defined(_WIN32)
  79 #include <stdarg.h>
  80 int mbedtls_platform_win32_snprintf( char *s, size_t n, const char *fmt, ... )
  81 {
  82     int ret;
  83     va_list argp;
  84
  85     /* Avoid calling the invalid parameter handler by checking ourselves */
  86     if( s == NULL || n == 0 || fmt == NULL )
  87         return( -1 );
  88
  89     va_start( argp, fmt );
  90 #if defined(_TRUNCATE) && !defined(__MINGW32__)
  91     ret = _vsnprintf_s( s, n, _TRUNCATE, fmt, argp );
  92 #else
  93     ret = _vsnprintf( s, n, fmt, argp );
  94     if( ret < 0 || (size_t) ret == n )
  95     {
  96         s[n-1] = '\0';
  97         ret = -1;
  98     }
  99 #endif
 100     va_end( argp );
 101
 102     return( ret );
 103 }
 104 #endif
 105
 106 #if defined(MBEDTLS_PLATFORM_SNPRINTF_ALT)
 107 #if !defined(MBEDTLS_PLATFORM_STD_SNPRINTF)
 108 /*
 109  * Make dummy function to prevent NULL pointer dereferences
 110  */
 111 static int platform_snprintf_uninit( char * s, size_t n,
 112                                      const char * format, ... )
 113 {
 114     ((void) s);
 115     ((void) n);
 116     ((void) format);
 117     return( 0 );
 118 }
 119
 120 #define MBEDTLS_PLATFORM_STD_SNPRINTF    platform_snprintf_uninit
 121 #endif /* !MBEDTLS_PLATFORM_STD_SNPRINTF */
 122
 123 int (*mbedtls_snprintf)( char * s, size_t n,
 124                           const char * format,
 125                           ... ) = MBEDTLS_PLATFORM_STD_SNPRINTF;
 126
 127 int mbedtls_platform_set_snprintf( int (*snprintf_func)( char * s, size_t n,
 128                                                  const char * format,
 129                                                  ... ) )
 130 {
 131     mbedtls_snprintf = snprintf_func;
 132     return( 0 );
 133 }
 134 #endif /* MBEDTLS_PLATFORM_SNPRINTF_ALT */
 135
 136 #if defined(MBEDTLS_PLATFORM_PRINTF_ALT)
 137 #if !defined(MBEDTLS_PLATFORM_STD_PRINTF)
 138 /*
 139  * Make dummy function to prevent NULL pointer dereferences
 140  */
 141 static int platform_printf_uninit( const char *format, ... )
 142 {
 143     ((void) format);
 144     return( 0 );
 145 }
 146
 147 #define MBEDTLS_PLATFORM_STD_PRINTF    platform_printf_uninit
 148 #endif /* !MBEDTLS_PLATFORM_STD_PRINTF */
 149
 150 int (*mbedtls_printf)( const char *, ... ) = MBEDTLS_PLATFORM_STD_PRINTF;
 151
 152 int mbedtls_platform_set_printf( int (*printf_func)( const char *, ... ) )
 153 {
 154     mbedtls_printf = printf_func;
 155     return( 0 );
 156 }
 157 #endif /* MBEDTLS_PLATFORM_PRINTF_ALT */
 158
 159 #if defined(MBEDTLS_PLATFORM_FPRINTF_ALT)
 160 #if !defined(MBEDTLS_PLATFORM_STD_FPRINTF)
 161 /*
 162  * Make dummy function to prevent NULL pointer dereferences
 163  */
 164 static int platform_fprintf_uninit( FILE *stream, const char *format, ... )
 165 {
 166     ((void) stream);
 167     ((void) format);
 168     return( 0 );
 169 }
 170
 171 #define MBEDTLS_PLATFORM_STD_FPRINTF   platform_fprintf_uninit
 172 #endif /* !MBEDTLS_PLATFORM_STD_FPRINTF */
 173
 174 int (*mbedtls_fprintf)( FILE *, const char *, ... ) =
 175                                         MBEDTLS_PLATFORM_STD_FPRINTF;
 176
 177 int mbedtls_platform_set_fprintf( int (*fprintf_func)( FILE *, const char *, ... ) )
 178 {
 179     mbedtls_fprintf = fprintf_func;
 180     return( 0 );
 181 }
 182 #endif /* MBEDTLS_PLATFORM_FPRINTF_ALT */
 183
 184 #if defined(MBEDTLS_PLATFORM_EXIT_ALT)
 185 #if !defined(MBEDTLS_PLATFORM_STD_EXIT)
 186 /*
 187  * Make dummy function to prevent NULL pointer dereferences
 188  */
 189 static void platform_exit_uninit( int status )
 190 {
 191     ((void) status);
 192 }
 193
 194 #define MBEDTLS_PLATFORM_STD_EXIT   platform_exit_uninit
 195 #endif /* !MBEDTLS_PLATFORM_STD_EXIT */
 196
 197 void (*mbedtls_exit)( int status ) = MBEDTLS_PLATFORM_STD_EXIT;
 198
 199 int mbedtls_platform_set_exit( void (*exit_func)( int status ) )
 200 {
 201     mbedtls_exit = exit_func;
 202     return( 0 );
 203 }
 204 #endif /* MBEDTLS_PLATFORM_EXIT_ALT */
 205
 206 #if defined(MBEDTLS_HAVE_TIME)
 207
 208 #if defined(MBEDTLS_PLATFORM_TIME_ALT)
 209 #if !defined(MBEDTLS_PLATFORM_STD_TIME)
 210 /*
 211  * Make dummy function to prevent NULL pointer dereferences
 212  */
 213 static mbedtls_time_t platform_time_uninit( mbedtls_time_t* timer )
 214 {
 215     ((void) timer);
 216     return( 0 );
 217 }
 218
 219 #define MBEDTLS_PLATFORM_STD_TIME   platform_time_uninit
 220 #endif /* !MBEDTLS_PLATFORM_STD_TIME */
 221
 222 mbedtls_time_t (*mbedtls_time)( mbedtls_time_t* timer ) = MBEDTLS_PLATFORM_STD_TIME;
 223
 224 int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* timer ) )
 225 {
 226     mbedtls_time = time_func;
 227     return( 0 );
 228 }
 229 #endif /* MBEDTLS_PLATFORM_TIME_ALT */
 230
 231 #endif /* MBEDTLS_HAVE_TIME */
 232
 233 #if defined(MBEDTLS_ENTROPY_NV_SEED)
 234 #if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
 235 /* Default implementations for the platform independent seed functions use
 236  * standard libc file functions to read from and write to a pre-defined filename
 237  */
 238 int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len )
 239 {
 240     FILE *file;
 241     size_t n;
 242
 243     if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb" ) ) == NULL )
 244         return( -1 );
 245
 246     if( ( n = fread( buf, 1, buf_len, file ) ) != buf_len )
 247     {
 248         fclose( file );
 249         mbedtls_platform_zeroize( buf, buf_len );
 250         return( -1 );
 251     }
 252
 253     fclose( file );
 254     return( (int)n );
 255 }
 256
 257 int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len )
 258 {
 259     FILE *file;
 260     size_t n;
 261
 262     if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w" ) ) == NULL )
 263         return -1;
 264
 265     if( ( n = fwrite( buf, 1, buf_len, file ) ) != buf_len )
 266     {
 267         fclose( file );
 268         return -1;
 269     }
 270
 271     fclose( file );
 272     return( (int)n );
 273 }
 274 #endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
 275
 276 #if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
 277 #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ)
 278 /*
 279  * Make dummy function to prevent NULL pointer dereferences
 280  */
 281 static int platform_nv_seed_read_uninit( unsigned char *buf, size_t buf_len )
 282 {
 283     ((void) buf);
 284     ((void) buf_len);
 285     return( -1 );
 286 }
 287
 288 #define MBEDTLS_PLATFORM_STD_NV_SEED_READ   platform_nv_seed_read_uninit
 289 #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_READ */
 290
 291 #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE)
 292 /*
 293  * Make dummy function to prevent NULL pointer dereferences
 294  */
 295 static int platform_nv_seed_write_uninit( unsigned char *buf, size_t buf_len )
 296 {
 297     ((void) buf);
 298     ((void) buf_len);
 299     return( -1 );
 300 }
 301
 302 #define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE   platform_nv_seed_write_uninit
 303 #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_WRITE */
 304
 305 int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len ) =
 306             MBEDTLS_PLATFORM_STD_NV_SEED_READ;
 307 int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len ) =
 308             MBEDTLS_PLATFORM_STD_NV_SEED_WRITE;
 309
 310 int mbedtls_platform_set_nv_seed(
 311         int (*nv_seed_read_func)( unsigned char *buf, size_t buf_len ),
 312         int (*nv_seed_write_func)( unsigned char *buf, size_t buf_len ) )
 313 {
 314     mbedtls_nv_seed_read = nv_seed_read_func;
 315     mbedtls_nv_seed_write = nv_seed_write_func;
 316     return( 0 );
 317 }
 318 #endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
 319 #endif /* MBEDTLS_ENTROPY_NV_SEED */
 320
 321 #if !defined(MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT)
 322 /*
 323  * Placeholder platform setup that does nothing by default
 324  */
 325 int mbedtls_platform_setup( mbedtls_platform_context *ctx )
 326 {
 327     (void)ctx;
 328
 329     return( 0 );
 330 }
 331
 332 /*
 333  * Placeholder platform teardown that does nothing by default
 334  */
 335 void mbedtls_platform_teardown( mbedtls_platform_context *ctx )
 336 {
 337     (void)ctx;
 338 }
 339 #endif /* MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT */
 340
 341 #endif /* MBEDTLS_PLATFORM_C */