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)
platform_calloc_uninit(size_t n,size_t size)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)
platform_free_uninit(void * ptr)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
mbedtls_platform_set_calloc_free(void * (* calloc_func)(size_t,size_t),void (* free_func)(void *))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>
mbedtls_platform_win32_snprintf(char * s,size_t n,const char * fmt,...)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 */
platform_snprintf_uninit(char * s,size_t n,const char * format,...)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
mbedtls_platform_set_snprintf(int (* snprintf_func)(char * s,size_t n,const char * format,...))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 */
platform_printf_uninit(const char * format,...)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
mbedtls_platform_set_printf(int (* printf_func)(const char *,...))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 */
platform_fprintf_uninit(FILE * stream,const char * format,...)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
mbedtls_platform_set_fprintf(int (* fprintf_func)(FILE *,const char *,...))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 */
platform_exit_uninit(int status)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
mbedtls_platform_set_exit(void (* exit_func)(int status))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_HAVE_TIME)
194
195 #if defined(MBEDTLS_PLATFORM_TIME_ALT)
196 #if !defined(MBEDTLS_PLATFORM_STD_TIME)
197 /*
198 * Make dummy function to prevent NULL pointer dereferences
199 */
platform_time_uninit(mbedtls_time_t * timer)200 static mbedtls_time_t platform_time_uninit( mbedtls_time_t* timer )
201 {
202 ((void) timer);
203 return( 0 );
204 }
205
206 #define MBEDTLS_PLATFORM_STD_TIME platform_time_uninit
207 #endif /* !MBEDTLS_PLATFORM_STD_TIME */
208
209 mbedtls_time_t (*mbedtls_time)( mbedtls_time_t* timer ) = MBEDTLS_PLATFORM_STD_TIME;
210
mbedtls_platform_set_time(mbedtls_time_t (* time_func)(mbedtls_time_t * timer))211 int mbedtls_platform_set_time( mbedtls_time_t (*time_func)( mbedtls_time_t* timer ) )
212 {
213 mbedtls_time = time_func;
214 return( 0 );
215 }
216 #endif /* MBEDTLS_PLATFORM_TIME_ALT */
217
218 #endif /* MBEDTLS_HAVE_TIME */
219
220 #if defined(MBEDTLS_ENTROPY_NV_SEED)
221 #if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
222 /* Default implementations for the platform independent seed functions use
223 * standard libc file functions to read from and write to a pre-defined filename
224 */
mbedtls_platform_std_nv_seed_read(unsigned char * buf,size_t buf_len)225 int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len )
226 {
227 FILE *file;
228 size_t n;
229
230 if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "rb" ) ) == NULL )
231 return -1;
232
233 if( ( n = fread( buf, 1, buf_len, file ) ) != buf_len )
234 {
235 fclose( file );
236 return -1;
237 }
238
239 fclose( file );
240 return( n );
241 }
242
mbedtls_platform_std_nv_seed_write(unsigned char * buf,size_t buf_len)243 int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len )
244 {
245 FILE *file;
246 size_t n;
247
248 if( ( file = fopen( MBEDTLS_PLATFORM_STD_NV_SEED_FILE, "w" ) ) == NULL )
249 return -1;
250
251 if( ( n = fwrite( buf, 1, buf_len, file ) ) != buf_len )
252 {
253 fclose( file );
254 return -1;
255 }
256
257 fclose( file );
258 return( n );
259 }
260 #endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
261
262 #if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
263 #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ)
264 /*
265 * Make dummy function to prevent NULL pointer dereferences
266 */
platform_nv_seed_read_uninit(unsigned char * buf,size_t buf_len)267 static int platform_nv_seed_read_uninit( unsigned char *buf, size_t buf_len )
268 {
269 ((void) buf);
270 ((void) buf_len);
271 return( -1 );
272 }
273
274 #define MBEDTLS_PLATFORM_STD_NV_SEED_READ platform_nv_seed_read_uninit
275 #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_READ */
276
277 #if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE)
278 /*
279 * Make dummy function to prevent NULL pointer dereferences
280 */
platform_nv_seed_write_uninit(unsigned char * buf,size_t buf_len)281 static int platform_nv_seed_write_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_WRITE platform_nv_seed_write_uninit
289 #endif /* !MBEDTLS_PLATFORM_STD_NV_SEED_WRITE */
290
291 int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len ) =
292 MBEDTLS_PLATFORM_STD_NV_SEED_READ;
293 int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len ) =
294 MBEDTLS_PLATFORM_STD_NV_SEED_WRITE;
295
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))296 int mbedtls_platform_set_nv_seed(
297 int (*nv_seed_read_func)( unsigned char *buf, size_t buf_len ),
298 int (*nv_seed_write_func)( unsigned char *buf, size_t buf_len ) )
299 {
300 mbedtls_nv_seed_read = nv_seed_read_func;
301 mbedtls_nv_seed_write = nv_seed_write_func;
302 return( 0 );
303 }
304 #endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
305 #endif /* MBEDTLS_ENTROPY_NV_SEED */
306
307 #endif /* MBEDTLS_PLATFORM_C */
308
