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 34 #if defined(MBEDTLS_PLATFORM_MEMORY) 35 #if !defined(MBEDTLS_PLATFORM_STD_CALLOC) 36 static void *platform_calloc_uninit( size_t n, size_t size ) 37 { 38 ((void) n); 39 ((void) size); 40 return( NULL ); 41 } 42 43 #define MBEDTLS_PLATFORM_STD_CALLOC platform_calloc_uninit 44 #endif /* !MBEDTLS_PLATFORM_STD_CALLOC */ 45 46 #if !defined(MBEDTLS_PLATFORM_STD_FREE) 47 static void platform_free_uninit( void *ptr ) 48 { 49 ((void) ptr); 50 } 51 52 #define MBEDTLS_PLATFORM_STD_FREE platform_free_uninit 53 #endif /* !MBEDTLS_PLATFORM_STD_FREE */ 54 55 void * (*mbedtls_calloc)( size_t, size_t ) = MBEDTLS_PLATFORM_STD_CALLOC; 56 void (*mbedtls_free)( void * ) = MBEDTLS_PLATFORM_STD_FREE; 57 58 int mbedtls_platform_set_calloc_free( void * (*calloc_func)( size_t, size_t ), 59 void (*free_func)( void * ) ) 60 { 61 mbedtls_calloc = calloc_func; 62 mbedtls_free = free_func; 63 return( 0 ); 64 } 65 #endif /* MBEDTLS_PLATFORM_MEMORY */ 66 67 #if defined(_WIN32) 68 #include <stdarg.h> 69 int mbedtls_platform_win32_snprintf( char *s, size_t n, const char *fmt, ... ) 70 { 71 int ret; 72 va_list argp; 73 74 /* Avoid calling the invalid parameter handler by checking ourselves */ 75 if( s == NULL || n == 0 || fmt == NULL ) 76 return( -1 ); 77 78 va_start( argp, fmt ); 79 #if defined(_TRUNCATE) 80 ret = _vsnprintf_s( s, n, _TRUNCATE, fmt, argp ); 81 #else 82 ret = _vsnprintf( s, n, fmt, argp ); 83 if( ret < 0 || (size_t) ret == n ) 84 { 85 s[n-1] = '\0'; 86 ret = -1; 87 } 88 #endif 89 va_end( argp ); 90 91 return( ret ); 92 } 93 #endif 94 95 #if defined(MBEDTLS_PLATFORM_SNPRINTF_ALT) 96 #if !defined(MBEDTLS_PLATFORM_STD_SNPRINTF) 97 /* 98 * Make dummy function to prevent NULL pointer dereferences 99 */ 100 static int platform_snprintf_uninit( char * s, size_t n, 101 const char * format, ... ) 102 { 103 ((void) s); 104 ((void) n); 105 ((void) format); 106 return( 0 ); 107 } 108 109 #define MBEDTLS_PLATFORM_STD_SNPRINTF platform_snprintf_uninit 110 #endif /* !MBEDTLS_PLATFORM_STD_SNPRINTF */ 111 112 int (*mbedtls_snprintf)( char * s, size_t n, 113 const char * format, 114 ... ) = MBEDTLS_PLATFORM_STD_SNPRINTF; 115 116 int mbedtls_platform_set_snprintf( int (*snprintf_func)( char * s, size_t n, 117 const char * format, 118 ... ) ) 119 { 120 mbedtls_snprintf = snprintf_func; 121 return( 0 ); 122 } 123 #endif /* MBEDTLS_PLATFORM_SNPRINTF_ALT */ 124 125 #if defined(MBEDTLS_PLATFORM_PRINTF_ALT) 126 #if !defined(MBEDTLS_PLATFORM_STD_PRINTF) 127 /* 128 * Make dummy function to prevent NULL pointer dereferences 129 */ 130 static int platform_printf_uninit( const char *format, ... ) 131 { 132 ((void) format); 133 return( 0 ); 134 } 135 136 #define MBEDTLS_PLATFORM_STD_PRINTF platform_printf_uninit 137 #endif /* !MBEDTLS_PLATFORM_STD_PRINTF */ 138 139 int (*mbedtls_printf)( const char *, ... ) = MBEDTLS_PLATFORM_STD_PRINTF; 140 141 int mbedtls_platform_set_printf( int (*printf_func)( const char *, ... ) ) 142 { 143 mbedtls_printf = printf_func; 144 return( 0 ); 145 } 146 #endif /* MBEDTLS_PLATFORM_PRINTF_ALT */ 147 148 #if defined(MBEDTLS_PLATFORM_FPRINTF_ALT) 149 #if !defined(MBEDTLS_PLATFORM_STD_FPRINTF) 150 /* 151 * Make dummy function to prevent NULL pointer dereferences 152 */ 153 static int platform_fprintf_uninit( FILE *stream, const char *format, ... ) 154 { 155 ((void) stream); 156 ((void) format); 157 return( 0 ); 158 } 159 160 #define MBEDTLS_PLATFORM_STD_FPRINTF platform_fprintf_uninit 161 #endif /* !MBEDTLS_PLATFORM_STD_FPRINTF */ 162 163 int (*mbedtls_fprintf)( FILE *, const char *, ... ) = 164 MBEDTLS_PLATFORM_STD_FPRINTF; 165 166 int mbedtls_platform_set_fprintf( int (*fprintf_func)( FILE *, const char *, ... ) ) 167 { 168 mbedtls_fprintf = fprintf_func; 169 return( 0 ); 170 } 171 #endif /* MBEDTLS_PLATFORM_FPRINTF_ALT */ 172 173 #if defined(MBEDTLS_PLATFORM_EXIT_ALT) 174 #if !defined(MBEDTLS_PLATFORM_STD_EXIT) 175 /* 176 * Make dummy function to prevent NULL pointer dereferences 177 */ 178 static void platform_exit_uninit( int status ) 179 { 180 ((void) status); 181 } 182 183 #define MBEDTLS_PLATFORM_STD_EXIT platform_exit_uninit 184 #endif /* !MBEDTLS_PLATFORM_STD_EXIT */ 185 186 void (*mbedtls_exit)( int status ) = MBEDTLS_PLATFORM_STD_EXIT; 187 188 int mbedtls_platform_set_exit( void (*exit_func)( int status ) ) 189 { 190 mbedtls_exit = exit_func; 191 return( 0 ); 192 } 193 #endif /* MBEDTLS_PLATFORM_EXIT_ALT */ 194 195 #if defined(MBEDTLS_HAVE_TIME) 196 197 #if defined(MBEDTLS_PLATFORM_TIME_ALT) 198 #if !defined(MBEDTLS_PLATFORM_STD_TIME) 199 /* 200 * Make dummy function to prevent NULL pointer dereferences 201 */ 202 static mbedtls_time_t platform_time_uninit( mbedtls_time_t* timer ) 203 { 204 ((void) timer); 205 return( 0 ); 206 } 207 208 #define MBEDTLS_PLATFORM_STD_TIME platform_time_uninit 209 #endif /* !MBEDTLS_PLATFORM_STD_TIME */ 210 211 mbedtls_time_t (*mbedtls_time)( mbedtls_time_t* timer ) = MBEDTLS_PLATFORM_STD_TIME; 212 213 int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* timer ) ) 214 { 215 mbedtls_time = time_func; 216 return( 0 ); 217 } 218 #endif /* MBEDTLS_PLATFORM_TIME_ALT */ 219 220 #endif /* MBEDTLS_HAVE_TIME */ 221 222 #if defined(MBEDTLS_ENTROPY_NV_SEED) 223 #if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO) 224 /* Default implementations for the platform independent seed functions use 225 * standard libc file functions to read from and write to a pre-defined filename 226 */ 227 int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len ) 228 { 229 FILE *file; 230 size_t n; 231 232 if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb" ) ) == NULL ) 233 return -1; 234 235 if( ( n = fread( buf, 1, buf_len, file ) ) != buf_len ) 236 { 237 fclose( file ); 238 return -1; 239 } 240 241 fclose( file ); 242 return( (int)n ); 243 } 244 245 int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len ) 246 { 247 FILE *file; 248 size_t n; 249 250 if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w" ) ) == NULL ) 251 return -1; 252 253 if( ( n = fwrite( buf, 1, buf_len, file ) ) != buf_len ) 254 { 255 fclose( file ); 256 return -1; 257 } 258 259 fclose( file ); 260 return( (int)n ); 261 } 262 #endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */ 263 264 #if defined(MBEDTLS_PLATFORM_NV_SEED_ALT) 265 #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ) 266 /* 267 * Make dummy function to prevent NULL pointer dereferences 268 */ 269 static int platform_nv_seed_read_uninit( unsigned char *buf, size_t buf_len ) 270 { 271 ((void) buf); 272 ((void) buf_len); 273 return( -1 ); 274 } 275 276 #define MBEDTLS_PLATFORM_STD_NV_SEED_READ platform_nv_seed_read_uninit 277 #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_READ */ 278 279 #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE) 280 /* 281 * Make dummy function to prevent NULL pointer dereferences 282 */ 283 static int platform_nv_seed_write_uninit( unsigned char *buf, size_t buf_len ) 284 { 285 ((void) buf); 286 ((void) buf_len); 287 return( -1 ); 288 } 289 290 #define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE platform_nv_seed_write_uninit 291 #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_WRITE */ 292 293 int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len ) = 294 MBEDTLS_PLATFORM_STD_NV_SEED_READ; 295 int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len ) = 296 MBEDTLS_PLATFORM_STD_NV_SEED_WRITE; 297 298 int mbedtls_platform_set_nv_seed( 299 int (*nv_seed_read_func)( unsigned char *buf, size_t buf_len ), 300 int (*nv_seed_write_func)( unsigned char *buf, size_t buf_len ) ) 301 { 302 mbedtls_nv_seed_read = nv_seed_read_func; 303 mbedtls_nv_seed_write = nv_seed_write_func; 304 return( 0 ); 305 } 306 #endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */ 307 #endif /* MBEDTLS_ENTROPY_NV_SEED */ 308 309 #if !defined(MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT) 310 /* 311 * Placeholder platform setup that does nothing by default 312 */ 313 int mbedtls_platform_setup( mbedtls_platform_context *ctx ) 314 { 315 (void)ctx; 316 317 return( 0 ); 318 } 319 320 /* 321 * Placeholder platform teardown that does nothing by default 322 */ 323 void mbedtls_platform_teardown( mbedtls_platform_context *ctx ) 324 { 325 (void)ctx; 326 } 327 #endif /* MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT */ 328 329 #endif /* MBEDTLS_PLATFORM_C */ 330