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<?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>SSL_accept</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></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="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>SSL_accept - wait for a TLS/SSL client to initiate a TLS/SSL handshake</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <pre><code> #include <openssl/ssl.h> int SSL_accept(SSL *ssl);</code></pre> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>SSL_accept() waits for a TLS/SSL client to initiate the TLS/SSL handshake. The communication channel must already have been set and assigned to the <b>ssl</b> by setting an underlying <b>BIO</b>.</p> <h1 id="NOTES">NOTES</h1> <p>The behaviour of SSL_accept() depends on the underlying BIO.</p> <p>If the underlying BIO is <b>blocking</b>, SSL_accept() will only return once the handshake has been finished or an error occurred.</p> <p>If the underlying BIO is <b>nonblocking</b>, SSL_accept() will also return when the underlying BIO could not satisfy the needs of SSL_accept() to continue the handshake, indicating the problem by the return value -1. In this case a call to SSL_get_error() with the return value of SSL_accept() will yield <b>SSL_ERROR_WANT_READ</b> or <b>SSL_ERROR_WANT_WRITE</b>. The calling process then must repeat the call after taking appropriate action to satisfy the needs of SSL_accept(). The action depends on the underlying BIO. When using a nonblocking socket, nothing is to be done, but select() can be used to check for the required condition. When using a buffering BIO, like a BIO pair, data must be written into or retrieved out of the BIO before being able to continue.</p> <h1 id="RETURN-VALUES">RETURN VALUES</h1> <p>The following return values can occur:</p> <dl> <dt id="pod0">0</dt> <dd> <p>The TLS/SSL handshake was not successful but was shut down controlled and by the specifications of the TLS/SSL protocol. Call SSL_get_error() with the return value <b>ret</b> to find out the reason.</p> </dd> <dt id="pod1">1</dt> <dd> <p>The TLS/SSL handshake was successfully completed, a TLS/SSL connection has been established.</p> </dd> <dt id="pod01"><0</dt> <dd> <p>The TLS/SSL handshake was not successful because a fatal error occurred either at the protocol level or a connection failure occurred. The shutdown was not clean. It can also occur if action is needed to continue the operation for nonblocking BIOs. Call SSL_get_error() with the return value <b>ret</b> to find out the reason.</p> </dd> </dl> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man3/SSL_get_error.html">SSL_get_error(3)</a>, <a href="../man3/SSL_connect.html">SSL_connect(3)</a>, <a href="../man3/SSL_shutdown.html">SSL_shutdown(3)</a>, <a href="../man7/ssl.html">ssl(7)</a>, <a href="../man7/bio.html">bio(7)</a>, <a href="../man3/SSL_set_connect_state.html">SSL_set_connect_state(3)</a>, <a href="../man3/SSL_do_handshake.html">SSL_do_handshake(3)</a>, <a href="../man3/SSL_CTX_new.html">SSL_CTX_new(3)</a></p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2000-2020 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>