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fcd2d5a612
Previously, the API version limit was indicated with a numeric version
number. This was "natural" in the pre-3.0.0 because the version was
this simple number.
With 3.0.0, the version is divided into three separate numbers, and
it's only the major number that counts, but we still need to be able
to support pre-3.0.0 version limits.
Therefore, we allow OPENSSL_API_COMPAT to be defined with a pre-3.0.0
style numeric version number or with a simple major number, i.e. can
be defined like this for any application:
-D OPENSSL_API_COMPAT=0x10100000L
-D OPENSSL_API_COMPAT=3
Since the pre-3.0.0 numerical version numbers are high, it's easy to
distinguish between a simple major number and a pre-3.0.0 numerical
version number and to thereby support both forms at the same time.
Internally, we define the following macros depending on the value of
OPENSSL_API_COMPAT:
OPENSSL_API_0_9_8
OPENSSL_API_1_0_0
OPENSSL_API_1_1_0
OPENSSL_API_3
They indicate that functions marked for deprecation in the
corresponding major release shall not be built if defined.
Reviewed-by: Tim Hudson <tjh@openssl.org>
Reviewed-by: Matthias St. Pierre <Matthias.St.Pierre@ncp-e.com>
Reviewed-by: Matt Caswell <matt@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/7724)
88 lines
2.6 KiB
Plaintext
88 lines
2.6 KiB
Plaintext
=pod
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=head1 NAME
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OPENSSL_config, OPENSSL_no_config - simple OpenSSL configuration functions
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=head1 SYNOPSIS
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#include <openssl/conf.h>
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Deprecated since OpenSSL 1.1.0, can be hidden entirely by defining
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B<OPENSSL_API_COMPAT> with a suitable version value, see
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L<openssl_user_macros(7)>:
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void OPENSSL_config(const char *appname);
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void OPENSSL_no_config(void);
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=head1 DESCRIPTION
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OPENSSL_config() configures OpenSSL using the standard B<openssl.cnf> and
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reads from the application section B<appname>. If B<appname> is NULL then
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the default section, B<openssl_conf>, will be used.
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Errors are silently ignored.
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Multiple calls have no effect.
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OPENSSL_no_config() disables configuration. If called before OPENSSL_config()
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no configuration takes place.
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If the application is built with B<OPENSSL_LOAD_CONF> defined, then a
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call to OpenSSL_add_all_algorithms() will implicitly call OPENSSL_config()
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first.
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=head1 NOTES
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The OPENSSL_config() function is designed to be a very simple "call it and
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forget it" function.
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It is however B<much> better than nothing. Applications which need finer
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control over their configuration functionality should use the configuration
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functions such as CONF_modules_load() directly. This function is deprecated
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and its use should be avoided.
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Applications should instead call CONF_modules_load() during
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initialization (that is before starting any threads).
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There are several reasons why calling the OpenSSL configuration routines is
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advisable. For example, to load dynamic ENGINEs from shared libraries (DSOs).
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However very few applications currently support the control interface and so
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very few can load and use dynamic ENGINEs. Equally in future more sophisticated
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ENGINEs will require certain control operations to customize them. If an
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application calls OPENSSL_config() it doesn't need to know or care about
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ENGINE control operations because they can be performed by editing a
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configuration file.
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=head1 ENVIRONMENT
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=over 4
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=item B<OPENSSL_CONF>
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The path to the config file.
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Ignored in set-user-ID and set-group-ID programs.
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=back
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=head1 RETURN VALUES
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Neither OPENSSL_config() nor OPENSSL_no_config() return a value.
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=head1 SEE ALSO
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L<config(5)>,
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L<CONF_modules_load_file(3)>
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=head1 HISTORY
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The OPENSSL_no_config() and OPENSSL_config() functions were
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deprecated in OpenSSL 1.1.0 by OPENSSL_init_crypto().
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=head1 COPYRIGHT
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Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the OpenSSL license (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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