ERR_put_error.pod 6.2 KB

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  1. =pod
  2. =for openssl foreign manual errno(3)
  3. =head1 NAME
  4. ERR_raise, ERR_raise_data,
  5. ERR_put_error, ERR_add_error_data, ERR_add_error_vdata,
  6. ERR_add_error_txt, ERR_add_error_mem_bio
  7. - record an error
  8. =head1 SYNOPSIS
  9. #include <openssl/err.h>
  10. void ERR_raise(int lib, int reason);
  11. void ERR_raise_data(int lib, int reason, const char *fmt, ...);
  12. void ERR_add_error_data(int num, ...);
  13. void ERR_add_error_vdata(int num, va_list arg);
  14. void ERR_add_error_txt(const char *sep, const char *txt);
  15. void ERR_add_error_mem_bio(const char *sep, BIO *bio);
  16. The following function has been deprecated since OpenSSL 3.0, and can be
  17. hidden entirely by defining B<OPENSSL_API_COMPAT> with a suitable version value,
  18. see L<openssl_user_macros(7)>:
  19. void ERR_put_error(int lib, int func, int reason, const char *file, int line);
  20. =head1 DESCRIPTION
  21. ERR_raise() adds a new error to the thread's error queue. The
  22. error occurred in the library B<lib> for the reason given by the
  23. B<reason> code. Furthermore, the name of the file, the line, and name
  24. of the function where the error occurred is saved with the error
  25. record.
  26. ERR_raise_data() does the same thing as ERR_raise(), but also lets the
  27. caller specify additional information as a format string B<fmt> and an
  28. arbitrary number of values, which are processed with L<BIO_snprintf(3)>.
  29. ERR_put_error() adds an error code to the thread's error queue. It
  30. signals that the error of reason code B<reason> occurred in function
  31. B<func> of library B<lib>, in line number B<line> of B<file>.
  32. This function is usually called by a macro.
  33. ERR_add_error_data() associates the concatenation of its B<num> string
  34. arguments as additional data with the error code added last.
  35. ERR_add_error_vdata() is similar except the argument is a B<va_list>.
  36. Multiple calls to these functions append to the current top of the error queue.
  37. The total length of the string data per error is limited to 4096 characters.
  38. ERR_add_error_txt() appends the given text string as additional data to the
  39. last error queue entry, after inserting the optional separator string if it is
  40. not NULL and the top error entry does not yet have additional data.
  41. In case the separator is at the end of the text it is not appended to the data.
  42. The B<sep> argument may be for instance "\n" to insert a line break when needed.
  43. If the associated data would become more than 4096 characters long
  44. (which is the limit given above)
  45. it is split over sufficiently many new copies of the last error queue entry.
  46. ERR_add_error_mem_bio() is the same as ERR_add_error_txt() except that
  47. the text string is taken from the given memory BIO.
  48. It appends '\0' to the BIO contents if not already NUL-terminated.
  49. L<ERR_load_strings(3)> can be used to register
  50. error strings so that the application can a generate human-readable
  51. error messages for the error code.
  52. =head2 Reporting errors
  53. =head3 OpenSSL library reports
  54. Each OpenSSL sub-library has library code B<ERR_LIB_XXX> and has its own set
  55. of reason codes B<XXX_R_...>. These are both passed in combination to
  56. ERR_raise() and ERR_raise_data(), and the combination ultimately produces
  57. the correct error text for the reported error.
  58. All these macros and the numbers they have as values are specific to
  59. OpenSSL's libraries. OpenSSL reason codes normally consist of textual error
  60. descriptions. For example, the function ssl3_read_bytes() reports a
  61. "handshake failure" as follows:
  62. ERR_raise(ERR_LIB_SSL, SSL_R_SSL_HANDSHAKE_FAILURE);
  63. There are two exceptions:
  64. =over 4
  65. =item B<ERR_LIB_SYS>
  66. This "library code" indicates that a system error is being reported. In
  67. this case, the reason code given to ERR_raise() and ERR_raise_data() I<must>
  68. be L<errno(3)>.
  69. ERR_raise(ERR_LIB_SYS, errno);
  70. =item B<ERR_R_XXX>
  71. This set of error codes is considered global, and may be used in combination
  72. with any sub-library code.
  73. ERR_raise(ERR_LIB_RSA, ERR_R_PASSED_INVALID_ARGUMENT);
  74. =back
  75. =head3 Other pieces of software
  76. Other pieces of software that may want to use OpenSSL's error reporting
  77. system, such as engines or applications, must normally get their own
  78. numbers.
  79. =over 4
  80. =item *
  81. To get a "library" code, call L<ERR_get_next_error_library(3)>; this gives
  82. the calling code a dynamic number, usable for the duration of the process.
  83. =item *
  84. Reason codes for each such "library" are determined or generated by the
  85. authors of that code. They must be numbers in the range 1 to 524287 (in
  86. other words, they must be nonzero unsigned 18 bit integers).
  87. =back
  88. The exceptions mentioned in L</OpenSSL library reports> above are valid for
  89. other pieces of software, i.e. they may use B<ERR_LIB_SYS> to report system
  90. errors:
  91. ERR_raise(ERR_LIB_SYS, errno);
  92. ... and they may use B<ERR_R_XXX> macros together with their own "library"
  93. code.
  94. int app_lib_code = ERR_get_next_error_library();
  95. /* ... */
  96. ERR_raise(app_lib_code, ERR_R_PASSED_INVALID_ARGUMENT);
  97. =begin comment
  98. [These are OpenSSL specific recommendations]
  99. Reason codes should consist of uppercase characters, numbers and underscores
  100. only. The error file generation script translates the trailing section of a
  101. reason code (after the "_R_") into lowercase with underscores changed to
  102. spaces.
  103. Although a library will normally report errors using its own specific
  104. B<ERR_LIB_XXX> macro, another library's macro can be used, together with
  105. that other library's reason codes. This is normally only done when a library
  106. wants to include ASN1 code which must be combined with B<ERR_LIB_ASN1>
  107. macro.
  108. =end comment
  109. =head1 RETURN VALUES
  110. ERR_raise(), ERR_raise_data(), ERR_put_error(),
  111. ERR_add_error_data(), ERR_add_error_vdata()
  112. ERR_add_error_txt(), and ERR_add_error_mem_bio()
  113. return no values.
  114. =head1 NOTES
  115. ERR_raise(), ERR_raise() and ERR_put_error() are implemented as macros.
  116. =head1 SEE ALSO
  117. L<ERR_load_strings(3)>, L<ERR_get_next_error_library(3)>
  118. =head1 HISTORY
  119. ERR_raise, ERR_raise_data, ERR_add_error_txt() and ERR_add_error_mem_bio()
  120. were added in OpenSSL 3.0.
  121. =head1 COPYRIGHT
  122. Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
  123. Licensed under the Apache License 2.0 (the "License"). You may not use
  124. this file except in compliance with the License. You can obtain a copy
  125. in the file LICENSE in the source distribution or at
  126. L<https://www.openssl.org/source/license.html>.
  127. =cut