mirror of
https://github.com/openssl/openssl.git
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2b93900e28
Reviewed-by: Paul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/13320)
188 lines
6.0 KiB
Plaintext
188 lines
6.0 KiB
Plaintext
=pod
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=for openssl foreign manual errno(3)
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=head1 NAME
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ERR_raise, ERR_raise_data,
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ERR_put_error, ERR_add_error_data, ERR_add_error_vdata,
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ERR_add_error_txt, ERR_add_error_mem_bio
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- record an error
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=head1 SYNOPSIS
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#include <openssl/err.h>
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void ERR_raise(int lib, int reason);
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void ERR_raise_data(int lib, int reason, const char *fmt, ...);
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void ERR_add_error_data(int num, ...);
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void ERR_add_error_vdata(int num, va_list arg);
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void ERR_add_error_txt(const char *sep, const char *txt);
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void ERR_add_error_mem_bio(const char *sep, BIO *bio);
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Deprecated since OpenSSL 3.0:
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void ERR_put_error(int lib, int func, int reason, const char *file, int line);
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=head1 DESCRIPTION
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ERR_raise() adds a new error to the thread's error queue. The
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error occurred in the library B<lib> for the reason given by the
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B<reason> code. Furthermore, the name of the file, the line, and name
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of the function where the error occurred is saved with the error
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record.
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ERR_raise_data() does the same thing as ERR_raise(), but also lets the
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caller specify additional information as a format string B<fmt> and an
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arbitrary number of values, which are processed with L<BIO_snprintf(3)>.
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ERR_put_error() adds an error code to the thread's error queue. It
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signals that the error of reason code B<reason> occurred in function
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B<func> of library B<lib>, in line number B<line> of B<file>.
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This function is usually called by a macro.
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ERR_add_error_data() associates the concatenation of its B<num> string
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arguments as additional data with the error code added last.
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ERR_add_error_vdata() is similar except the argument is a B<va_list>.
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Multiple calls to these functions append to the current top of the error queue.
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The total length of the string data per error is limited to 4096 characters.
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ERR_add_error_txt() appends the given text string as additional data to the
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last error queue entry, after inserting the optional separator string if it is
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not NULL and the top error entry does not yet have additional data.
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In case the separator is at the end of the text it is not appended to the data.
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The B<sep> argument may be for instance "\n" to insert a line break when needed.
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If the associated data would become more than 4096 characters long
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(which is the limit given above)
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it is split over sufficiently many new copies of the last error queue entry.
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ERR_add_error_mem_bio() is the same as ERR_add_error_txt() except that
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the text string is taken from the given memory BIO.
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It appends '\0' to the BIO contents if not already NUL-terminated.
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L<ERR_load_strings(3)> can be used to register
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error strings so that the application can a generate human-readable
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error messages for the error code.
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=head2 Reporting errors
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=head3 OpenSSL library reports
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Each OpenSSL sub-library has library code B<ERR_LIB_XXX> and has its own set
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of reason codes B<XXX_R_...>. These are both passed in combination to
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ERR_raise() and ERR_raise_data(), and the combination ultimately produces
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the correct error text for the reported error.
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All these macros and the numbers they have as values are specific to
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OpenSSL's libraries. OpenSSL reason codes normally consist of textual error
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descriptions. For example, the function ssl3_read_bytes() reports a
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"handshake failure" as follows:
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ERR_raise(ERR_LIB_SSL, SSL_R_SSL_HANDSHAKE_FAILURE);
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There are two exceptions:
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=over 4
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=item B<ERR_LIB_SYS>
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This "library code" indicates that a system error is being reported. In
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this case, the reason code given to ERR_raise() and ERR_raise_data() I<must>
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be L<errno(3)>.
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ERR_raise(ERR_LIB_SYS, errno);
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=item B<ERR_R_XXX>
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This set of error codes is considered global, and may be used in combination
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with any sub-library code.
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ERR_raise(ERR_LIB_RSA, ERR_R_PASSED_INVALID_ARGUMENT);
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=back
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=head3 Other pieces of software
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Other pieces of software that may want to use OpenSSL's error reporting
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system, such as engines or applications, must normally get their own
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numbers.
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=over 4
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=item *
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To get a "library" code, call L<ERR_get_next_error_library(3)>; this gives
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the calling code a dynamic number, usable for the duration of the process.
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=item *
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Reason codes for each such "library" are determined or generated by the
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authors of that code. They must be numbers in the range 1 to 524287 (in
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other words, they must be nonzero unsigned 18 bit integers).
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=back
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The exceptions mentioned in L</OpenSSL library reports> above are valid for
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other pieces of software, i.e. they may use B<ERR_LIB_SYS> to report system
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errors:
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ERR_raise(ERR_LIB_SYS, errno);
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... and they may use B<ERR_R_XXX> macros together with their own "library"
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code.
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int app_lib_code = ERR_get_next_error_library();
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/* ... */
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ERR_raise(app_lib_code, ERR_R_PASSED_INVALID_ARGUMENT);
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=begin comment
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[These are OpenSSL specific recommendations]
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Reason codes should consist of uppercase characters, numbers and underscores
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only. The error file generation script translates the trailing section of a
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reason code (after the "_R_") into lowercase with underscores changed to
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spaces.
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Although a library will normally report errors using its own specific
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B<ERR_LIB_XXX> macro, another library's macro can be used, together with
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that other library's reason codes. This is normally only done when a library
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wants to include ASN1 code which must be combined with B<ERR_LIB_ASN1>
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macro.
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=end comment
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=head1 RETURN VALUES
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ERR_raise(), ERR_raise_data(), ERR_put_error(),
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ERR_add_error_data(), ERR_add_error_vdata()
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ERR_add_error_txt(), and ERR_add_error_mem_bio()
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return no values.
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=head1 NOTES
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ERR_raise(), ERR_raise() and ERR_put_error() are implemented as macros.
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=head1 SEE ALSO
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L<ERR_load_strings(3)>, L<ERR_get_next_error_library(3)>
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=head1 HISTORY
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ERR_raise, ERR_raise_data, ERR_add_error_txt() and ERR_add_error_mem_bio()
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were added in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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