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OSSL_STORE_ctrl.html
<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>OSSL_STORE_open</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <ul id="index"> <li><a href="#NAME">NAME</a></li> <li><a href="#SYNOPSIS">SYNOPSIS</a></li> <li><a href="#DESCRIPTION">DESCRIPTION</a> <ul> <li><a href="#Types">Types</a></li> <li><a href="#Functions">Functions</a></li> </ul> </li> <li><a href="#SUPPORTED-SCHEMES">SUPPORTED SCHEMES</a></li> <li><a href="#NOTES">NOTES</a></li> <li><a href="#RETURN-VALUES">RETURN VALUES</a></li> <li><a href="#SEE-ALSO">SEE ALSO</a></li> <li><a href="#HISTORY">HISTORY</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>OSSL_STORE_CTX, OSSL_STORE_post_process_info_fn, OSSL_STORE_open, OSSL_STORE_ctrl, OSSL_STORE_load, OSSL_STORE_eof, OSSL_STORE_error, OSSL_STORE_close - Types and functions to read objects from a URI</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/store.h> typedef struct ossl_store_ctx_st OSSL_STORE_CTX; typedef OSSL_STORE_INFO *(*OSSL_STORE_post_process_info_fn)(OSSL_STORE_INFO *, void *); OSSL_STORE_CTX *OSSL_STORE_open(const char *uri, const UI_METHOD *ui_method, void *ui_data, OSSL_STORE_post_process_info_fn post_process, void *post_process_data); int OSSL_STORE_ctrl(OSSL_STORE_CTX *ctx, int cmd, ... /* args */); OSSL_STORE_INFO *OSSL_STORE_load(OSSL_STORE_CTX *ctx); int OSSL_STORE_eof(OSSL_STORE_CTX *ctx); int OSSL_STORE_error(OSSL_STORE_CTX *ctx); int OSSL_STORE_close(OSSL_STORE_CTX *ctx);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>These functions help the application to fetch supported objects (see <a href="../man3/OSSL_STORE_INFO.html">"SUPPORTED OBJECTS" in OSSL_STORE_INFO(3)</a> for information on which those are) from a given URI (see <a href="#SUPPORTED-SCHEMES">"SUPPORTED SCHEMES"</a> for more information on the supported URI schemes). The general method to do so is to "open" the URI using OSSL_STORE_open(), read each available and supported object using OSSL_STORE_load() as long as OSSL_STORE_eof() hasn't been reached, and finish it off with OSSL_STORE_close().</p> <p>The retrieved information is stored in a <b>OSSL_STORE_INFO</b>, which is further described in <a href="../man3/OSSL_STORE_INFO.html">OSSL_STORE_INFO(3)</a>.</p> <h2 id="Types">Types</h2> <p><b>OSSL_STORE_CTX</b> is a context variable that holds all the internal information for OSSL_STORE_open(), OSSL_STORE_load(), OSSL_STORE_eof() and OSSL_STORE_close() to work together.</p> <h2 id="Functions">Functions</h2> <p>OSSL_STORE_open() takes a uri or path <i>uri</i>, password UI method <i>ui_method</i> with associated data <i>ui_data</i>, and post processing callback <i>post_process</i> with associated data <i>post_process_data</i>, opens a channel to the data located at that URI and returns a <b>OSSL_STORE_CTX</b> with all necessary internal information. The given <i>ui_method</i> and <i>ui_data</i> will be reused by all functions that use <b>OSSL_STORE_CTX</b> when interaction is needed, for instance to provide a password. The given <i>post_process</i> and <i>post_process_data</i> will be reused by OSSL_STORE_load() to manipulate or drop the value to be returned. The <i>post_process</i> function drops values by returning NULL, which will cause OSSL_STORE_load() to start its process over with loading the next object, until <i>post_process</i> returns something other than NULL, or the end of data is reached as indicated by OSSL_STORE_eof().</p> <p>OSSL_STORE_ctrl() takes a <b>OSSL_STORE_CTX</b>, and command number <i>cmd</i> and more arguments not specified here. The available loader specific command numbers and arguments they each take depends on the loader that's used and is documented together with that loader.</p> <p>There are also global controls available:</p> <dl> <dt id="OSSL_STORE_C_USE_SECMEM"><b>OSSL_STORE_C_USE_SECMEM</b></dt> <dd> <p>Controls if the loader should attempt to use secure memory for any allocated <b>OSSL_STORE_INFO</b> and its contents. This control expects one argument, a pointer to an <b>int</b> that is expected to have the value 1 (yes) or 0 (no). Any other value is an error.</p> </dd> </dl> <p>OSSL_STORE_load() takes a <b>OSSL_STORE_CTX</b>, tries to load the next available object and return it wrapped with <b>OSSL_STORE_INFO</b>.</p> <p>OSSL_STORE_eof() takes a <b>OSSL_STORE_CTX</b> and checks if we've reached the end of data.</p> <p>OSSL_STORE_error() takes a <b>OSSL_STORE_CTX</b> and checks if an error occurred in the last OSSL_STORE_load() call. Note that it may still be meaningful to try and load more objects, unless OSSL_STORE_eof() shows that the end of data has been reached.</p> <p>OSSL_STORE_close() takes a <b>OSSL_STORE_CTX</b>, closes the channel that was opened by OSSL_STORE_open() and frees all other information that was stored in the <b>OSSL_STORE_CTX</b>, as well as the <b>OSSL_STORE_CTX</b> itself. If <i>ctx</i> is NULL it does nothing.</p> <h1 id="SUPPORTED-SCHEMES">SUPPORTED SCHEMES</h1> <p>The basic supported scheme is <b>file:</b>. Any other scheme can be added dynamically, using OSSL_STORE_register_loader().</p> <h1 id="NOTES">NOTES</h1> <p>A string without a scheme prefix (that is, a non-URI string) is implicitly interpreted as using the <i>file:</i> scheme.</p> <p>There are some tools that can be used together with OSSL_STORE_open() to determine if any failure is caused by an unparsable URI, or if it's a different error (such as memory allocation failures); if the URI was parsable but the scheme unregistered, the top error will have the reason <code>OSSL_STORE_R_UNREGISTERED_SCHEME</code>.</p> <p>These functions make no direct assumption regarding the pass phrase received from the password callback. The loaders may make assumptions, however. For example, the <b>file:</b> scheme loader inherits the assumptions made by OpenSSL functionality that handles the different file types; this is mostly relevant for PKCS#12 objects. See <a href="../man7/passphrase-encoding.html">passphrase-encoding(7)</a> for further information.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>OSSL_STORE_open() returns a pointer to a <b>OSSL_STORE_CTX</b> on success, or NULL on failure.</p> <p>OSSL_STORE_load() returns a pointer to a <b>OSSL_STORE_INFO</b> on success, or NULL on error or when end of data is reached. Use OSSL_STORE_error() and OSSL_STORE_eof() to determine the meaning of a returned NULL.</p> <p>OSSL_STORE_eof() returns 1 if the end of data has been reached, otherwise 0.</p> <p>OSSL_STORE_error() returns 1 if an error occurred in an OSSL_STORE_load() call, otherwise 0.</p> <p>OSSL_STORE_ctrl() and OSSL_STORE_close() returns 1 on success, or 0 on failure.</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man7/ossl_store.html">ossl_store(7)</a>, <a href="../man3/OSSL_STORE_INFO.html">OSSL_STORE_INFO(3)</a>, <a href="../man3/OSSL_STORE_register_loader.html">OSSL_STORE_register_loader(3)</a>, <a href="../man7/passphrase-encoding.html">passphrase-encoding(7)</a></p> <h1 id="HISTORY">HISTORY</h1> <p>OSSL_STORE_CTX(), OSSL_STORE_post_process_info_fn(), OSSL_STORE_open(), OSSL_STORE_ctrl(), OSSL_STORE_load(), OSSL_STORE_eof() and OSSL_STORE_close() were added in OpenSSL 1.1.1.</p> <p>Handling of NULL <i>ctx</i> argument for OSSL_STORE_close() was introduced in OpenSSL 1.1.1h.</p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2016-2020 The OpenSSL Project Authors. All Rights Reserved.</p> <p>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 <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p> </body> </html>
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