NAME

       OPENSSL_config, OPENSSL_no_config - simple OpenSSL configuration functions

SYNOPSIS

        #include <openssl/conf.h>

        #if OPENSSL_API_COMPAT < 0x10100000L
        void OPENSSL_config(const char *appname);
        void OPENSSL_no_config(void);
        #endif

DESCRIPTION

       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.

NOTES

       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.

ENVIRONMENT

       OPENSSL_CONF
           The path to the config file.  Ignored in set-user-ID and set-group-ID programs.

RETURN VALUES

       Neither OPENSSL_config() nor OPENSSL_no_config() return a value.

SEE ALSO

       config(5), CONF_modules_load_file(3)

HISTORY

       The OPENSSL_no_config() and OPENSSL_config() functions were deprecated in OpenSSL 1.1.0 by
       OPENSSL_init_crypto().

COPYRIGHT

       Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved.

       Licensed under the OpenSSL license (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>.