OPENSSL_config, OPENSSL_no_config - simple OpenSSL configuration functions
#include <openssl/conf.h>
The following functions have been deprecated since OpenSSL 1.1.0, and can be
hidden entirely by defining
OPENSSL_API_COMPAT with a suitable version
value, see
openssl_user_macros(7):
void OPENSSL_config(const char *appname);
void OPENSSL_no_config(void);
OPENSSL_config() configures OpenSSL using the standard
openssl.cnf
and reads from the application section
appname. If
appname is
NULL then the default section,
openssl_conf, will be used. Errors are
silently ignored. Multiple calls have no effect.
OPENSSL_no_config() disables configuration. If called before
OPENSSL_config() no configuration takes place.
If the application is built with
OPENSSL_LOAD_CONF defined, then a call
to
OpenSSL_add_all_algorithms() will implicitly call
OPENSSL_config() first.
The
OPENSSL_config() function is designed to be a very simple "call
it and forget it" function. It is however
much better than
nothing. Applications which need finer control over their configuration
functionality should use the configuration functions such as
CONF_modules_load() directly. This function is deprecated and its use
should be avoided. Applications should instead call
CONF_modules_load()
during initialization (that is before starting any threads).
There are several reasons why calling the OpenSSL configuration routines is
advisable. For example, to load dynamic ENGINEs from shared libraries (DSOs).
However, very few applications currently support the control interface and so
very few can load and use dynamic ENGINEs. Equally in future more
sophisticated ENGINEs will require certain control operations to customize
them. If an application calls
OPENSSL_config() it doesn't need to know
or care about ENGINE control operations because they can be performed by
editing a configuration file.
- OPENSSL_CONF
- The path to the config file. Ignored in set-user-ID and
set-group-ID programs.
Neither
OPENSSL_config() nor
OPENSSL_no_config() return a value.
config(5),
CONF_modules_load_file(3)
The
OPENSSL_no_config() and
OPENSSL_config() functions were
deprecated in OpenSSL 1.1.0 by
OPENSSL_init_crypto().
Copyright 2004-2021 The OpenSSL Project Authors. All Rights Reserved.
Licensed under the Apache License 2.0 (the "License"). You may not use
this file except in compliance with the License. You can obtain a copy in the
file LICENSE in the source distribution or at
<
https://www.openssl.org/source/license.html>.