1 | /*
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2 | * Threading abstraction layer
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3 | *
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4 | * Copyright (C) 2006-2015, ARM Limited, All Rights Reserved
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5 | * SPDX-License-Identifier: Apache-2.0
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6 | *
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7 | * Licensed under the Apache License, Version 2.0 (the "License"); you may
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8 | * not use this file except in compliance with the License.
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9 | * You may obtain a copy of the License at
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10 | *
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11 | * http://www.apache.org/licenses/LICENSE-2.0
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12 | *
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13 | * Unless required by applicable law or agreed to in writing, software
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14 | * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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15 | * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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16 | * See the License for the specific language governing permissions and
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17 | * limitations under the License.
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18 | *
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19 | * This file is part of mbed TLS (https://tls.mbed.org)
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20 | */
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21 |
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22 | /*
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23 | * Ensure gmtime_r is available even with -std=c99; must be defined before
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24 | * config.h, which pulls in glibc's features.h. Harmless on other platforms.
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25 | */
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26 | #if !defined(_POSIX_C_SOURCE)
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27 | #define _POSIX_C_SOURCE 200112L
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28 | #endif
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29 |
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30 | #if !defined(MBEDTLS_CONFIG_FILE)
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31 | #include "mbedtls/config.h"
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32 | #else
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33 | #include MBEDTLS_CONFIG_FILE
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34 | #endif
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35 |
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36 | #if defined(MBEDTLS_THREADING_C)
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37 |
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38 | #include "mbedtls/threading.h"
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39 |
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40 | #if defined(MBEDTLS_HAVE_TIME_DATE) && !defined(MBEDTLS_PLATFORM_GMTIME_R_ALT)
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41 |
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42 | #if !defined(_WIN32) && (defined(unix) || \
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43 | defined(__unix) || defined(__unix__) || (defined(__APPLE__) && \
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44 | defined(__MACH__)))
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45 | #include <unistd.h>
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46 | #endif /* !_WIN32 && (unix || __unix || __unix__ ||
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47 | * (__APPLE__ && __MACH__)) */
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48 |
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49 | #if !( ( defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L ) || \
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50 | ( defined(_POSIX_THREAD_SAFE_FUNCTIONS ) && \
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51 | _POSIX_THREAD_SAFE_FUNCTIONS >= 20112L ) )
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52 | /*
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53 | * This is a convenience shorthand macro to avoid checking the long
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54 | * preprocessor conditions above. Ideally, we could expose this macro in
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55 | * platform_util.h and simply use it in platform_util.c, threading.c and
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56 | * threading.h. However, this macro is not part of the Mbed TLS public API, so
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57 | * we keep it private by only defining it in this file
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58 | */
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59 |
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60 | #if ! ( defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) )
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61 | #define THREADING_USE_GMTIME
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62 | #endif /* ! ( defined(_WIN32) && !defined(EFIX64) && !defined(EFI32) ) */
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63 |
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64 | #endif /* !( ( defined(_POSIX_VERSION) && _POSIX_VERSION >= 200809L ) || \
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65 | ( defined(_POSIX_THREAD_SAFE_FUNCTIONS ) && \
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66 | _POSIX_THREAD_SAFE_FUNCTIONS >= 20112L ) ) */
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67 |
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68 | #endif /* MBEDTLS_HAVE_TIME_DATE && !MBEDTLS_PLATFORM_GMTIME_R_ALT */
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69 |
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70 | #if defined(MBEDTLS_THREADING_PTHREAD)
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71 | static void threading_mutex_init_pthread( mbedtls_threading_mutex_t *mutex )
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72 | {
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73 | if( mutex == NULL )
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74 | return;
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75 |
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76 | mutex->is_valid = pthread_mutex_init( &mutex->mutex, NULL ) == 0;
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77 | }
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78 |
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79 | static void threading_mutex_free_pthread( mbedtls_threading_mutex_t *mutex )
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80 | {
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81 | if( mutex == NULL || !mutex->is_valid )
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82 | return;
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83 |
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84 | (void) pthread_mutex_destroy( &mutex->mutex );
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85 | mutex->is_valid = 0;
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86 | }
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87 |
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88 | static int threading_mutex_lock_pthread( mbedtls_threading_mutex_t *mutex )
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89 | {
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90 | if( mutex == NULL || ! mutex->is_valid )
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91 | return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
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92 |
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93 | if( pthread_mutex_lock( &mutex->mutex ) != 0 )
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94 | return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
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95 |
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96 | return( 0 );
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97 | }
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98 |
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99 | static int threading_mutex_unlock_pthread( mbedtls_threading_mutex_t *mutex )
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100 | {
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101 | if( mutex == NULL || ! mutex->is_valid )
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102 | return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
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103 |
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104 | if( pthread_mutex_unlock( &mutex->mutex ) != 0 )
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105 | return( MBEDTLS_ERR_THREADING_MUTEX_ERROR );
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106 |
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107 | return( 0 );
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108 | }
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109 |
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110 | void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_init_pthread;
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111 | void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_free_pthread;
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112 | int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_lock_pthread;
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113 | int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_unlock_pthread;
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114 |
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115 | /*
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116 | * With phtreads we can statically initialize mutexes
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117 | */
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118 | #define MUTEX_INIT = { PTHREAD_MUTEX_INITIALIZER, 1 }
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119 |
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120 | #endif /* MBEDTLS_THREADING_PTHREAD */
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121 |
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122 | #if defined(MBEDTLS_THREADING_ALT)
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123 | static int threading_mutex_fail( mbedtls_threading_mutex_t *mutex )
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124 | {
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125 | ((void) mutex );
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126 | return( MBEDTLS_ERR_THREADING_BAD_INPUT_DATA );
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127 | }
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128 | static void threading_mutex_dummy( mbedtls_threading_mutex_t *mutex )
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129 | {
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130 | ((void) mutex );
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131 | return;
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132 | }
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133 |
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134 | void (*mbedtls_mutex_init)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;
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135 | void (*mbedtls_mutex_free)( mbedtls_threading_mutex_t * ) = threading_mutex_dummy;
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136 | int (*mbedtls_mutex_lock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;
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137 | int (*mbedtls_mutex_unlock)( mbedtls_threading_mutex_t * ) = threading_mutex_fail;
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138 |
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139 | /*
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140 | * Set functions pointers and initialize global mutexes
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141 | */
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142 | void mbedtls_threading_set_alt( void (*mutex_init)( mbedtls_threading_mutex_t * ),
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143 | void (*mutex_free)( mbedtls_threading_mutex_t * ),
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144 | int (*mutex_lock)( mbedtls_threading_mutex_t * ),
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145 | int (*mutex_unlock)( mbedtls_threading_mutex_t * ) )
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146 | {
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147 | mbedtls_mutex_init = mutex_init;
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148 | mbedtls_mutex_free = mutex_free;
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149 | mbedtls_mutex_lock = mutex_lock;
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150 | mbedtls_mutex_unlock = mutex_unlock;
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151 |
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152 | #if defined(MBEDTLS_FS_IO)
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153 | mbedtls_mutex_init( &mbedtls_threading_readdir_mutex );
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154 | #endif
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155 | #if defined(THREADING_USE_GMTIME)
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156 | mbedtls_mutex_init( &mbedtls_threading_gmtime_mutex );
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157 | #endif
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158 | }
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159 |
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160 | /*
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161 | * Free global mutexes
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162 | */
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163 | void mbedtls_threading_free_alt( void )
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164 | {
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165 | #if defined(MBEDTLS_FS_IO)
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166 | mbedtls_mutex_free( &mbedtls_threading_readdir_mutex );
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167 | #endif
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168 | #if defined(THREADING_USE_GMTIME)
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169 | mbedtls_mutex_free( &mbedtls_threading_gmtime_mutex );
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170 | #endif
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171 | }
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172 | #endif /* MBEDTLS_THREADING_ALT */
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173 |
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174 | /*
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175 | * Define global mutexes
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176 | */
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177 | #ifndef MUTEX_INIT
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178 | #define MUTEX_INIT
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179 | #endif
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180 | #if defined(MBEDTLS_FS_IO)
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181 | mbedtls_threading_mutex_t mbedtls_threading_readdir_mutex MUTEX_INIT;
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182 | #endif
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183 | #if defined(THREADING_USE_GMTIME)
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184 | mbedtls_threading_mutex_t mbedtls_threading_gmtime_mutex MUTEX_INIT;
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185 | #endif
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186 |
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187 | #endif /* MBEDTLS_THREADING_C */
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