include/openssl/macros.h

   1 /*
   2  * Copyright 2019-2021 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the Apache License 2.0 (the "License").  You may not use
   5  * this file except in compliance with the License.  You can obtain a copy
   6  * in the file LICENSE in the source distribution or at
   7  * https://www.openssl.org/source/license.html
   8  */
   9
  10 #ifndef OPENSSL_MACROS_H
  11 # define OPENSSL_MACROS_H
  12 # pragma once
  13
  14 #include <openssl/opensslconf.h>
  15 #include <openssl/opensslv.h>
  16
  17
  18 /* Helper macros for CPP string composition */
  19 # define OPENSSL_MSTR_HELPER(x) #x
  20 # define OPENSSL_MSTR(x) OPENSSL_MSTR_HELPER(x)
  21
  22 /*
  23  * Sometimes OPENSSSL_NO_xxx ends up with an empty file and some compilers
  24  * don't like that.  This will hopefully silence them.
  25  */
  26 # define NON_EMPTY_TRANSLATION_UNIT static void *dummy = &dummy;
  27
  28 /*
  29  * Generic deprecation macro
  30  *
  31  * If OPENSSL_SUPPRESS_DEPRECATED is defined, then OSSL_DEPRECATED and
  32  * OSSL_DEPRECATED_FOR become no-ops
  33  */
  34 # ifndef OSSL_DEPRECATED
  35 #  undef OSSL_DEPRECATED_FOR
  36 #  ifndef OPENSSL_SUPPRESS_DEPRECATED
  37 #   if defined(_MSC_VER)
  38      /*
  39       * MSVC supports __declspec(deprecated) since MSVC 2003 (13.10),
  40       * and __declspec(deprecated(message)) since MSVC 2005 (14.00)
  41       */
  42 #    if _MSC_VER >= 1400
  43 #     define OSSL_DEPRECATED(since) \
  44           __declspec(deprecated("Since OpenSSL " # since))
  45 #     define OSSL_DEPRECATED_FOR(since, message) \
  46           __declspec(deprecated("Since OpenSSL " # since ";" message))
  47 #    elif _MSC_VER >= 1310
  48 #     define OSSL_DEPRECATED(since) __declspec(deprecated)
  49 #     define OSSL_DEPRECATED_FOR(since, message) __declspec(deprecated)
  50 #    endif
  51 #   elif defined(__GNUC__)
  52      /*
  53       * According to GCC documentation, deprecations with message appeared in
  54       * GCC 4.5.0
  55       */
  56 #    if __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 5)
  57 #     define OSSL_DEPRECATED(since) \
  58           __attribute__((deprecated("Since OpenSSL " # since)))
  59 #     define OSSL_DEPRECATED_FOR(since, message) \
  60           __attribute__((deprecated("Since OpenSSL " # since ";" message)))
  61 #    elif __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 0)
  62 #     define OSSL_DEPRECATED(since) __attribute__((deprecated))
  63 #     define OSSL_DEPRECATED_FOR(since, message) __attribute__((deprecated))
  64 #    endif
  65 #   elif defined(__SUNPRO_C)
  66 #    if (__SUNPRO_C >= 0x5130)
  67 #     define OSSL_DEPRECATED(since) __attribute__ ((deprecated))
  68 #     define OSSL_DEPRECATED_FOR(since, message) __attribute__ ((deprecated))
  69 #    endif
  70 #   endif
  71 #  endif
  72 # endif
  73
  74 /*
  75  * Still not defined?  Then define no-op macros. This means these macros
  76  * are unsuitable for use in a typedef.
  77  */
  78 # ifndef OSSL_DEPRECATED
  79 #  define OSSL_DEPRECATED(since)                extern
  80 #  define OSSL_DEPRECATED_FOR(since, message)   extern
  81 # endif
  82
  83 /*
  84  * Applications should use -DOPENSSL_API_COMPAT=<version> to suppress the
  85  * declarations of functions deprecated in or before <version>.  If this is
  86  * undefined, the value of the macro OPENSSL_CONFIGURED_API (defined in
  87  * <openssl/opensslconf.h>) is the default.
  88  *
  89  * For any version number up until version 1.1.x, <version> is expected to be
  90  * the calculated version number 0xMNNFFPPSL.
  91  * For version numbers 3.0 and on, <version> is expected to be a computation
  92  * of the major and minor numbers in decimal using this formula:
  93  *
  94  *     MAJOR * 10000 + MINOR * 100
  95  *
  96  * So version 3.0 becomes 30000, version 3.2 becomes 30200, etc.
  97  */
  98
  99 /*
 100  * We use the OPENSSL_API_COMPAT value to define API level macros.  These
 101  * macros are used to enable or disable features at that API version boundary.
 102  */
 103
 104 # ifdef OPENSSL_API_LEVEL
 105 #  error "OPENSSL_API_LEVEL must not be defined by application"
 106 # endif
 107
 108 /*
 109  * We figure out what API level was intended by simple numeric comparison.
 110  * The lowest old style number we recognise is 0x00908000L, so we take some
 111  * safety margin and assume that anything below 0x00900000L is a new style
 112  * number.  This allows new versions up to and including v943.71.83.
 113  */
 114 # ifdef OPENSSL_API_COMPAT
 115 #  if OPENSSL_API_COMPAT < 0x900000L
 116 #   define OPENSSL_API_LEVEL (OPENSSL_API_COMPAT)
 117 #  else
 118 #   define OPENSSL_API_LEVEL                            \
 119            (((OPENSSL_API_COMPAT >> 28) & 0xF) * 10000  \
 120             + ((OPENSSL_API_COMPAT >> 20) & 0xFF) * 100 \
 121             + ((OPENSSL_API_COMPAT >> 12) & 0xFF))
 122 #  endif
 123 # endif
 124
 125 /*
 126  * If OPENSSL_API_COMPAT wasn't given, we use default numbers to set
 127  * the API compatibility level.
 128  */
 129 # ifndef OPENSSL_API_LEVEL
 130 #  if OPENSSL_CONFIGURED_API > 0
 131 #   define OPENSSL_API_LEVEL (OPENSSL_CONFIGURED_API)
 132 #  else
 133 #   define OPENSSL_API_LEVEL \
 134            (OPENSSL_VERSION_MAJOR * 10000 + OPENSSL_VERSION_MINOR * 100)
 135 #  endif
 136 # endif
 137
 138 # if OPENSSL_API_LEVEL > OPENSSL_CONFIGURED_API
 139 #  error "The requested API level higher than the configured API compatibility level"
 140 # endif
 141
 142 /*
 143  * Check of sane values.
 144  */
 145 /* Can't go higher than the current version. */
 146 # if OPENSSL_API_LEVEL > (OPENSSL_VERSION_MAJOR * 10000 + OPENSSL_VERSION_MINOR * 100)
 147 #  error "OPENSSL_API_COMPAT expresses an impossible API compatibility level"
 148 # endif
 149 /* OpenSSL will have no version 2.y.z */
 150 # if OPENSSL_API_LEVEL < 30000 && OPENSSL_API_LEVEL >= 20000
 151 #  error "OPENSSL_API_COMPAT expresses an impossible API compatibility level"
 152 # endif
 153 /* Below 0.9.8 is unacceptably low */
 154 # if OPENSSL_API_LEVEL < 908
 155 #  error "OPENSSL_API_COMPAT expresses an impossible API compatibility level"
 156 # endif
 157
 158 /*
 159  * Define macros for deprecation and simulated removal purposes.
 160  *
 161  * The macros OSSL_DEPRECATED_{major}_{minor} are always defined for
 162  * all OpenSSL versions we care for.  They can be used as attributes
 163  * in function declarations where appropriate.
 164  *
 165  * The macros OPENSSL_NO_DEPRECATED_{major}_{minor} are defined for
 166  * all OpenSSL versions up to or equal to the version given with
 167  * OPENSSL_API_COMPAT.  They are used as guards around anything that's
 168  * deprecated up to that version, as an effect of the developer option
 169  * 'no-deprecated'.
 170  */
 171
 172 # undef OPENSSL_NO_DEPRECATED_3_0
 173 # undef OPENSSL_NO_DEPRECATED_1_1_1
 174 # undef OPENSSL_NO_DEPRECATED_1_1_0
 175 # undef OPENSSL_NO_DEPRECATED_1_0_2
 176 # undef OPENSSL_NO_DEPRECATED_1_0_1
 177 # undef OPENSSL_NO_DEPRECATED_1_0_0
 178 # undef OPENSSL_NO_DEPRECATED_0_9_8
 179
 180 # if OPENSSL_API_LEVEL >= 30000
 181 #  ifndef OPENSSL_NO_DEPRECATED
 182 #   define OSSL_DEPRECATEDIN_3_0                OSSL_DEPRECATED(3.0)
 183 #   define OSSL_DEPRECATEDIN_3_0_FOR(msg)       OSSL_DEPRECATED_FOR(3.0, msg)
 184 #  else
 185 #   define OPENSSL_NO_DEPRECATED_3_0
 186 #  endif
 187 # else
 188 #  define OSSL_DEPRECATEDIN_3_0
 189 #  define OSSL_DEPRECATEDIN_3_0_FOR(msg)
 190 # endif
 191 # if OPENSSL_API_LEVEL >= 10101
 192 #  ifndef OPENSSL_NO_DEPRECATED
 193 #   define OSSL_DEPRECATEDIN_1_1_1              OSSL_DEPRECATED(1.1.1)
 194 #   define OSSL_DEPRECATEDIN_1_1_1_FOR(msg)     OSSL_DEPRECATED_FOR(1.1.1, msg)
 195 #  else
 196 #   define OPENSSL_NO_DEPRECATED_1_1_1
 197 #  endif
 198 # else
 199 #  define OSSL_DEPRECATEDIN_1_1_1
 200 #  define OSSL_DEPRECATEDIN_1_1_1_FOR(msg)
 201 # endif
 202 # if OPENSSL_API_LEVEL >= 10100
 203 #  ifndef OPENSSL_NO_DEPRECATED
 204 #   define OSSL_DEPRECATEDIN_1_1_0              OSSL_DEPRECATED(1.1.0)
 205 #   define OSSL_DEPRECATEDIN_1_1_0_FOR(msg)     OSSL_DEPRECATED_FOR(1.1.0, msg)
 206 #  else
 207 #   define OPENSSL_NO_DEPRECATED_1_1_0
 208 #  endif
 209 # else
 210 #  define OSSL_DEPRECATEDIN_1_1_0
 211 #  define OSSL_DEPRECATEDIN_1_1_0_FOR(msg)
 212 # endif
 213 # if OPENSSL_API_LEVEL >= 10002
 214 #  ifndef OPENSSL_NO_DEPRECATED
 215 #   define OSSL_DEPRECATEDIN_1_0_2              OSSL_DEPRECATED(1.0.2)
 216 #   define OSSL_DEPRECATEDIN_1_0_2_FOR(msg)     OSSL_DEPRECATED_FOR(1.0.2, msg)
 217 #  else
 218 #   define OPENSSL_NO_DEPRECATED_1_0_2
 219 #  endif
 220 # else
 221 #  define OSSL_DEPRECATEDIN_1_0_2
 222 #  define OSSL_DEPRECATEDIN_1_0_2_FOR(msg)
 223 # endif
 224 # if OPENSSL_API_LEVEL >= 10001
 225 #  ifndef OPENSSL_NO_DEPRECATED
 226 #   define OSSL_DEPRECATEDIN_1_0_1              OSSL_DEPRECATED(1.0.1)
 227 #   define OSSL_DEPRECATEDIN_1_0_1_FOR(msg)     OSSL_DEPRECATED_FOR(1.0.1, msg)
 228 #  else
 229 #   define OPENSSL_NO_DEPRECATED_1_0_1
 230 #  endif
 231 # else
 232 #  define OSSL_DEPRECATEDIN_1_0_1
 233 #  define OSSL_DEPRECATEDIN_1_0_1_FOR(msg)
 234 # endif
 235 # if OPENSSL_API_LEVEL >= 10000
 236 #  ifndef OPENSSL_NO_DEPRECATED
 237 #   define OSSL_DEPRECATEDIN_1_0_0              OSSL_DEPRECATED(1.0.0)
 238 #   define OSSL_DEPRECATEDIN_1_0_0_FOR(msg)     OSSL_DEPRECATED_FOR(1.0.0, msg)
 239 #  else
 240 #   define OPENSSL_NO_DEPRECATED_1_0_0
 241 #  endif
 242 # else
 243 #  define OSSL_DEPRECATEDIN_1_0_0
 244 #  define OSSL_DEPRECATEDIN_1_0_0_FOR(msg)
 245 # endif
 246 # if OPENSSL_API_LEVEL >= 908
 247 #  ifndef OPENSSL_NO_DEPRECATED
 248 #   define OSSL_DEPRECATEDIN_0_9_8              OSSL_DEPRECATED(0.9.8)
 249 #   define OSSL_DEPRECATEDIN_0_9_8_FOR(msg)     OSSL_DEPRECATED_FOR(0.9.8, msg)
 250 #  else
 251 #   define OPENSSL_NO_DEPRECATED_0_9_8
 252 #  endif
 253 # else
 254 #  define OSSL_DEPRECATEDIN_0_9_8
 255 #  define OSSL_DEPRECATEDIN_0_9_8_FOR(msg)
 256 # endif
 257
 258 /*
 259  * Make our own variants of __FILE__ and __LINE__, depending on configuration
 260  */
 261
 262 # ifndef OPENSSL_FILE
 263 #  ifdef OPENSSL_NO_FILENAMES
 264 #   define OPENSSL_FILE ""
 265 #   define OPENSSL_LINE 0
 266 #  else
 267 #   define OPENSSL_FILE __FILE__
 268 #   define OPENSSL_LINE __LINE__
 269 #  endif
 270 # endif
 271
 272 /*
 273  * __func__ was standardized in C99, so for any compiler that claims
 274  * to implement that language level or newer, we assume we can safely
 275  * use that symbol.
 276  *
 277  * GNU C also provides __FUNCTION__ since version 2, which predates
 278  * C99.  We can, however, only use this if __STDC_VERSION__ exists,
 279  * as it's otherwise not allowed according to ISO C standards (C90).
 280  * (compiling with GNU C's -pedantic tells us so)
 281  *
 282  * If none of the above applies, we check if the compiler is MSVC,
 283  * and use __FUNCTION__ if that's the case.
 284  */
 285 # ifndef OPENSSL_FUNC
 286 #  if defined(__STDC_VERSION__)
 287 #   if __STDC_VERSION__ >= 199901L
 288 #    define OPENSSL_FUNC __func__
 289 #   elif defined(__GNUC__) && __GNUC__ >= 2
 290 #    define OPENSSL_FUNC __FUNCTION__
 291 #   endif
 292 #  elif defined(_MSC_VER)
 293 #    define OPENSSL_FUNC __FUNCTION__
 294 #  endif
 295 /*
 296  * If all these possibilities are exhausted, we give up and use a
 297  * static string.
 298  */
 299 #  ifndef OPENSSL_FUNC
 300 #   define OPENSSL_FUNC "(unknown function)"
 301 #  endif
 302 # endif
 303
 304 #endif  /* OPENSSL_MACROS_H */