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1/**
2 * \file platform.h
3 *
4 * \brief This file contains the definitions and functions of the
5 * Mbed TLS platform abstraction layer.
6 *
7 * The platform abstraction layer removes the need for the library
8 * to directly link to standard C library functions or operating
9 * system services, making the library easier to port and embed.
10 * Application developers and users of the library can provide their own
11 * implementations of these functions, or implementations specific to
12 * their platform, which can be statically linked to the library or
13 * dynamically configured at runtime.
14 */
15/*
16 * Copyright (C) 2006-2018, Arm Limited (or its affiliates), All Rights Reserved
17 * SPDX-License-Identifier: GPL-2.0
18 *
19 * This program is free software; you can redistribute it and/or modify
20 * it under the terms of the GNU General Public License as published by
21 * the Free Software Foundation; either version 2 of the License, or
22 * (at your option) any later version.
23 *
24 * This program is distributed in the hope that it will be useful,
25 * but WITHOUT ANY WARRANTY; without even the implied warranty of
26 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
27 * GNU General Public License for more details.
28 *
29 * You should have received a copy of the GNU General Public License along
30 * with this program; if not, write to the Free Software Foundation, Inc.,
31 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
32 *
33 * This file is part of Mbed TLS (https://tls.mbed.org)
34 */
35#ifndef MBEDTLS_PLATFORM_H
36#define MBEDTLS_PLATFORM_H
37
38#if !defined(MBEDTLS_CONFIG_FILE)
39#include "config.h"
40#else
41#include MBEDTLS_CONFIG_FILE
42#endif
43
44#if defined(MBEDTLS_HAVE_TIME)
45#include "platform_time.h"
46#endif
47
48#ifdef __cplusplus
49extern "C" {
50#endif
51
52/**
53 * \name SECTION: Module settings
54 *
55 * The configuration options you can set for this module are in this section.
56 * Either change them in config.h or define them on the compiler command line.
57 * \{
58 */
59
60#if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS)
61#include <stdio.h>
62#include <stdlib.h>
63#include <time.h>
64#if !defined(MBEDTLS_PLATFORM_STD_SNPRINTF)
65#if defined(_WIN32)
66#define MBEDTLS_PLATFORM_STD_SNPRINTF mbedtls_platform_win32_snprintf /**< The default \c snprintf function to use. */
67#else
68#define MBEDTLS_PLATFORM_STD_SNPRINTF snprintf /**< The default \c snprintf function to use. */
69#endif
70#endif
71#if !defined(MBEDTLS_PLATFORM_STD_PRINTF)
72#define MBEDTLS_PLATFORM_STD_PRINTF printf /**< The default \c printf function to use. */
73#endif
74#if !defined(MBEDTLS_PLATFORM_STD_FPRINTF)
75#define MBEDTLS_PLATFORM_STD_FPRINTF fprintf /**< The default \c fprintf function to use. */
76#endif
77#if !defined(MBEDTLS_PLATFORM_STD_CALLOC)
78#define MBEDTLS_PLATFORM_STD_CALLOC calloc /**< The default \c calloc function to use. */
79#endif
80#if !defined(MBEDTLS_PLATFORM_STD_FREE)
81#define MBEDTLS_PLATFORM_STD_FREE free /**< The default \c free function to use. */
82#endif
83#if !defined(MBEDTLS_PLATFORM_STD_EXIT)
84#define MBEDTLS_PLATFORM_STD_EXIT exit /**< The default \c exit function to use. */
85#endif
86#if !defined(MBEDTLS_PLATFORM_STD_TIME)
87#define MBEDTLS_PLATFORM_STD_TIME time /**< The default \c time function to use. */
88#endif
89#if !defined(MBEDTLS_PLATFORM_STD_EXIT_SUCCESS)
90#define MBEDTLS_PLATFORM_STD_EXIT_SUCCESS EXIT_SUCCESS /**< The default exit value to use. */
91#endif
92#if !defined(MBEDTLS_PLATFORM_STD_EXIT_FAILURE)
93#define MBEDTLS_PLATFORM_STD_EXIT_FAILURE EXIT_FAILURE /**< The default exit value to use. */
94#endif
95#if defined(MBEDTLS_FS_IO)
96#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_READ)
97#define MBEDTLS_PLATFORM_STD_NV_SEED_READ mbedtls_platform_std_nv_seed_read
98#endif
99#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_WRITE)
100#define MBEDTLS_PLATFORM_STD_NV_SEED_WRITE mbedtls_platform_std_nv_seed_write
101#endif
102#if !defined(MBEDTLS_PLATFORM_STD_NV_SEED_FILE)
103#define MBEDTLS_PLATFORM_STD_NV_SEED_FILE "seedfile"
104#endif
105#endif /* MBEDTLS_FS_IO */
106#else /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
107#if defined(MBEDTLS_PLATFORM_STD_MEM_HDR)
108#include MBEDTLS_PLATFORM_STD_MEM_HDR
109#endif
110#endif /* MBEDTLS_PLATFORM_NO_STD_FUNCTIONS */
111
112
113/* \} name SECTION: Module settings */
114
115/*
116 * The function pointers for calloc and free.
117 */
118#if defined(MBEDTLS_PLATFORM_MEMORY)
119#if defined(MBEDTLS_PLATFORM_FREE_MACRO) && \
120 defined(MBEDTLS_PLATFORM_CALLOC_MACRO)
121#define mbedtls_free MBEDTLS_PLATFORM_FREE_MACRO
122#define mbedtls_calloc MBEDTLS_PLATFORM_CALLOC_MACRO
123#else
124/* For size_t */
125#include <stddef.h>
126extern void *mbedtls_calloc( size_t n, size_t size );
127extern void mbedtls_free( void *ptr );
128
129/**
130 * \brief This function dynamically sets the memory-management
131 * functions used by the library, during runtime.
132 *
133 * \param calloc_func The \c calloc function implementation.
134 * \param free_func The \c free function implementation.
135 *
136 * \return \c 0.
137 */
138int mbedtls_platform_set_calloc_free( void * (*calloc_func)( size_t, size_t ),
139 void (*free_func)( void * ) );
140#endif /* MBEDTLS_PLATFORM_FREE_MACRO && MBEDTLS_PLATFORM_CALLOC_MACRO */
141#else /* !MBEDTLS_PLATFORM_MEMORY */
142#define mbedtls_free free
143#define mbedtls_calloc calloc
144#endif /* MBEDTLS_PLATFORM_MEMORY && !MBEDTLS_PLATFORM_{FREE,CALLOC}_MACRO */
145
146/*
147 * The function pointers for fprintf
148 */
149#if defined(MBEDTLS_PLATFORM_FPRINTF_ALT)
150/* We need FILE * */
151#include <stdio.h>
152extern int (*mbedtls_fprintf)( FILE *stream, const char *format, ... );
153
154/**
155 * \brief This function dynamically configures the fprintf
156 * function that is called when the
157 * mbedtls_fprintf() function is invoked by the library.
158 *
159 * \param fprintf_func The \c fprintf function implementation.
160 *
161 * \return \c 0.
162 */
163int mbedtls_platform_set_fprintf( int (*fprintf_func)( FILE *stream, const char *,
164 ... ) );
165#else
166#if defined(MBEDTLS_PLATFORM_FPRINTF_MACRO)
167#define mbedtls_fprintf MBEDTLS_PLATFORM_FPRINTF_MACRO
168#else
169#define mbedtls_fprintf fprintf
170#endif /* MBEDTLS_PLATFORM_FPRINTF_MACRO */
171#endif /* MBEDTLS_PLATFORM_FPRINTF_ALT */
172
173/*
174 * The function pointers for printf
175 */
176#if defined(MBEDTLS_PLATFORM_PRINTF_ALT)
177extern int (*mbedtls_printf)( const char *format, ... );
178
179/**
180 * \brief This function dynamically configures the snprintf
181 * function that is called when the mbedtls_snprintf()
182 * function is invoked by the library.
183 *
184 * \param printf_func The \c printf function implementation.
185 *
186 * \return \c 0 on success.
187 */
188int mbedtls_platform_set_printf( int (*printf_func)( const char *, ... ) );
189#else /* !MBEDTLS_PLATFORM_PRINTF_ALT */
190#if defined(MBEDTLS_PLATFORM_PRINTF_MACRO)
191#define mbedtls_printf MBEDTLS_PLATFORM_PRINTF_MACRO
192#else
193#define mbedtls_printf printf
194#endif /* MBEDTLS_PLATFORM_PRINTF_MACRO */
195#endif /* MBEDTLS_PLATFORM_PRINTF_ALT */
196
197/*
198 * The function pointers for snprintf
199 *
200 * The snprintf implementation should conform to C99:
201 * - it *must* always correctly zero-terminate the buffer
202 * (except when n == 0, then it must leave the buffer untouched)
203 * - however it is acceptable to return -1 instead of the required length when
204 * the destination buffer is too short.
205 */
206#if defined(_WIN32)
207/* For Windows (inc. MSYS2), we provide our own fixed implementation */
208int mbedtls_platform_win32_snprintf( char *s, size_t n, const char *fmt, ... );
209#endif
210
211#if defined(MBEDTLS_PLATFORM_SNPRINTF_ALT)
212extern int (*mbedtls_snprintf)( char * s, size_t n, const char * format, ... );
213
214/**
215 * \brief This function allows configuring a custom
216 * \c snprintf function pointer.
217 *
218 * \param snprintf_func The \c snprintf function implementation.
219 *
220 * \return \c 0 on success.
221 */
222int mbedtls_platform_set_snprintf( int (*snprintf_func)( char * s, size_t n,
223 const char * format, ... ) );
224#else /* MBEDTLS_PLATFORM_SNPRINTF_ALT */
225#if defined(MBEDTLS_PLATFORM_SNPRINTF_MACRO)
226#define mbedtls_snprintf MBEDTLS_PLATFORM_SNPRINTF_MACRO
227#else
228#define mbedtls_snprintf MBEDTLS_PLATFORM_STD_SNPRINTF
229#endif /* MBEDTLS_PLATFORM_SNPRINTF_MACRO */
230#endif /* MBEDTLS_PLATFORM_SNPRINTF_ALT */
231
232/*
233 * The function pointers for exit
234 */
235#if defined(MBEDTLS_PLATFORM_EXIT_ALT)
236extern void (*mbedtls_exit)( int status );
237
238/**
239 * \brief This function dynamically configures the exit
240 * function that is called when the mbedtls_exit()
241 * function is invoked by the library.
242 *
243 * \param exit_func The \c exit function implementation.
244 *
245 * \return \c 0 on success.
246 */
247int mbedtls_platform_set_exit( void (*exit_func)( int status ) );
248#else
249#if defined(MBEDTLS_PLATFORM_EXIT_MACRO)
250#define mbedtls_exit MBEDTLS_PLATFORM_EXIT_MACRO
251#else
252#define mbedtls_exit exit
253#endif /* MBEDTLS_PLATFORM_EXIT_MACRO */
254#endif /* MBEDTLS_PLATFORM_EXIT_ALT */
255
256/*
257 * The default exit values
258 */
259#if defined(MBEDTLS_PLATFORM_STD_EXIT_SUCCESS)
260#define MBEDTLS_EXIT_SUCCESS MBEDTLS_PLATFORM_STD_EXIT_SUCCESS
261#else
262#define MBEDTLS_EXIT_SUCCESS 0
263#endif
264#if defined(MBEDTLS_PLATFORM_STD_EXIT_FAILURE)
265#define MBEDTLS_EXIT_FAILURE MBEDTLS_PLATFORM_STD_EXIT_FAILURE
266#else
267#define MBEDTLS_EXIT_FAILURE 1
268#endif
269
270/*
271 * The function pointers for reading from and writing a seed file to
272 * Non-Volatile storage (NV) in a platform-independent way
273 *
274 * Only enabled when the NV seed entropy source is enabled
275 */
276#if defined(MBEDTLS_ENTROPY_NV_SEED)
277#if !defined(MBEDTLS_PLATFORM_NO_STD_FUNCTIONS) && defined(MBEDTLS_FS_IO)
278/* Internal standard platform definitions */
279int mbedtls_platform_std_nv_seed_read( unsigned char *buf, size_t buf_len );
280int mbedtls_platform_std_nv_seed_write( unsigned char *buf, size_t buf_len );
281#endif
282
283#if defined(MBEDTLS_PLATFORM_NV_SEED_ALT)
284extern int (*mbedtls_nv_seed_read)( unsigned char *buf, size_t buf_len );
285extern int (*mbedtls_nv_seed_write)( unsigned char *buf, size_t buf_len );
286
287/**
288 * \brief This function allows configuring custom seed file writing and
289 * reading functions.
290 *
291 * \param nv_seed_read_func The seed reading function implementation.
292 * \param nv_seed_write_func The seed writing function implementation.
293 *
294 * \return \c 0 on success.
295 */
296int 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#else
301#if defined(MBEDTLS_PLATFORM_NV_SEED_READ_MACRO) && \
302 defined(MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO)
303#define mbedtls_nv_seed_read MBEDTLS_PLATFORM_NV_SEED_READ_MACRO
304#define mbedtls_nv_seed_write MBEDTLS_PLATFORM_NV_SEED_WRITE_MACRO
305#else
306#define mbedtls_nv_seed_read mbedtls_platform_std_nv_seed_read
307#define mbedtls_nv_seed_write mbedtls_platform_std_nv_seed_write
308#endif
309#endif /* MBEDTLS_PLATFORM_NV_SEED_ALT */
310#endif /* MBEDTLS_ENTROPY_NV_SEED */
311
312#if !defined(MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT)
313
314/**
315 * \brief The platform context structure.
316 *
317 * \note This structure may be used to assist platform-specific
318 * setup or teardown operations.
319 */
320typedef struct mbedtls_platform_context
321{
322 char dummy; /**< A placeholder member, as empty structs are not portable. */
323}
324mbedtls_platform_context;
325
326#else
327#include "platform_alt.h"
328#endif /* !MBEDTLS_PLATFORM_SETUP_TEARDOWN_ALT */
329
330/**
331 * \brief This function performs any platform-specific initialization
332 * operations.
333 *
334 * \note This function should be called before any other library functions.
335 *
336 * Its implementation is platform-specific, and unless
337 * platform-specific code is provided, it does nothing.
338 *
339 * \note The usage and necessity of this function is dependent on the platform.
340 *
341 * \param ctx The platform context.
342 *
343 * \return \c 0 on success.
344 */
345int mbedtls_platform_setup( mbedtls_platform_context *ctx );
346/**
347 * \brief This function performs any platform teardown operations.
348 *
349 * \note This function should be called after every other Mbed TLS module
350 * has been correctly freed using the appropriate free function.
351 *
352 * Its implementation is platform-specific, and unless
353 * platform-specific code is provided, it does nothing.
354 *
355 * \note The usage and necessity of this function is dependent on the platform.
356 *
357 * \param ctx The platform context.
358 *
359 */
360void mbedtls_platform_teardown( mbedtls_platform_context *ctx );
361
362#ifdef __cplusplus
363}
364#endif
365
366#endif /* platform.h */
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