2020-03-02 16:50:34 +00:00
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<title>OPENSSL_config</title>
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#synopsis">SYNOPSIS</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#notes">NOTES</a></li>
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<li><a href="#environment">ENVIRONMENT</a></li>
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<li><a href="#return_values">RETURN VALUES</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
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<li><a href="#history">HISTORY</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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<h1><a name="name">NAME</a></h1>
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<p>OPENSSL_config, OPENSSL_no_config - simple OpenSSL configuration functions</p>
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<p>
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</p>
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<hr />
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<h1><a name="synopsis">SYNOPSIS</a></h1>
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<pre>
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#include <openssl/conf.h></pre>
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<pre>
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2020-03-02 17:19:21 +00:00
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#if OPENSSL_API_COMPAT < 0x10100000L
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void OPENSSL_config(const char *appname);
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2020-03-02 17:19:21 +00:00
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void OPENSSL_no_config(void);
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#endif</pre>
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2020-03-02 16:50:34 +00:00
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p><code>OPENSSL_config()</code> configures OpenSSL using the standard <strong>openssl.cnf</strong> and
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reads from the application section <strong>appname</strong>. If <strong>appname</strong> is NULL then
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the default section, <strong>openssl_conf</strong>, will be used.
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Errors are silently ignored.
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Multiple calls have no effect.</p>
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<p><code>OPENSSL_no_config()</code> disables configuration. If called before <code>OPENSSL_config()</code>
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no configuration takes place.</p>
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<p>If the application is built with <strong>OPENSSL_LOAD_CONF</strong> defined, then a
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call to <code>OpenSSL_add_all_algorithms()</code> will implicitly call <code>OPENSSL_config()</code>
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first.</p>
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<p>
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</p>
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<hr />
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<h1><a name="notes">NOTES</a></h1>
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<p>The <code>OPENSSL_config()</code> 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 <strong>much</strong> 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 <code>CONF_modules_load()</code> directly. This function is deprecated
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and its use should be avoided.
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Applications should instead call <code>CONF_modules_load()</code> during
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initialization (that is before starting any threads).</p>
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<p>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 <code>OPENSSL_config()</code> 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.</p>
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<p>
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</p>
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<hr />
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<h1><a name="environment">ENVIRONMENT</a></h1>
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<dl>
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<dt><strong><a name="openssl_conf" class="item"><strong>OPENSSL_CONF</strong></a></strong></dt>
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<dd>
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<p>The path to the config file.
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Ignored in set-user-ID and set-group-ID programs.</p>
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</dd>
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</dl>
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<p>
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</p>
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<hr />
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<h1><a name="return_values">RETURN VALUES</a></h1>
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<p>Neither <code>OPENSSL_config()</code> nor <code>OPENSSL_no_config()</code> return a value.</p>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><em>config(5)</em>,
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<em>CONF_modules_load_file(3)</em></p>
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<p>
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</p>
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<hr />
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<h1><a name="history">HISTORY</a></h1>
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<p>The <code>OPENSSL_no_config()</code> and <code>OPENSSL_config()</code> functions were
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deprecated in OpenSSL 1.1.0 by <code>OPENSSL_init_crypto()</code>.</p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2004-2018 The OpenSSL Project Authors. All Rights Reserved.</p>
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2020-03-02 17:19:21 +00:00
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<p>Licensed under the OpenSSL license (the "License"). You may not use
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2020-03-02 16:50:34 +00:00
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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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<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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