<br>

	<dt>
	  <strong>info</strong> <em>channel major minor message type</em>
	</dt>
	<dd>
	  This form of callback is invoked by the OpenSSL function
	  <code>SSL_CTX_set_info_callback()</code> during connection setup
	  and use.
	  <br>


	  <ul>
	  <li>Possible values for <em>major</em> are:
	  <code>handshake, alert, connect, accept</code>.</li>
	  <li>Possible values for <em>minor</em> are:
	  <code>start, done, read, write, loop, exit</code>.</li>
	  <li>The <em>message</em> argument is a descriptive string which may
	  be generated either by <code>SSL_state_string_long()</code> or by
	  <code>SSL_alert_desc_string_long()</code>, depending on context.</li>
	  <li>For alerts, the possible values for <em>type</em> are:
	  <code>warning, fatal, and unknown</code>. For others,
	  <code>info</code> is used.</li>
	  </ul>
	</dd>

	<dt>
	  <strong>message</strong> <em>channel direction version content_type data</em>
	</dt>
	<dd>
	  This form of callback is invoked by the OpenSSL function
	  <code>SSL_set_msg_callback()</code> whenever a message is sent or
	  received. It is only available when
	  OpenSSL is complied with the <em>enable-ssl-trace</em> option.
	  Where <em>direction</em> is Sent or Received, <em>version</em> is the
	  protocol version, <em>content_type</em> is the message content type,
	  and <em>data</em> is more info on the message from the <code>SSL_trace</code> API.
	</dd>
	<br>

	<dt>
	  <strong>session</strong> <em>session_id ticket lifetime</em>
	</dt>
	<dd>
	  This form of callback is invoked by the OpenSSL function
	  <code>SSL_CTX_sess_set_new_cb()</code>.

	<dl>

	<dt>
	  <strong>alpn</strong> <em>protocol</em>
	</dt>
	<dd>
	  For servers, this form of callback is invoked when the client ALPN
	  extension is received. Where <em>protocol</em> is the first
	  <b>-alpn</b> specified protocol common to the both the client and
	  server. If none, the first client specified protocol is used.
	</dd>

	<br>

	<dt>
	  <strong>hello</strong> <em>servername</em>
	</dt>

	<br>

	<dt>
	  <strong>sni</strong> <em>servername</em>
	</dt>
	<dd>
	  For servers, this form of callback is invoked when the SNI extension
	  from the client is received. Where <em>servername</em> is the client
	  provided server name from the <b>-servername</b> option. This is
	  used when a server supports multiple names, so the right certificate
	  can be used. Called after hello callback but before ALPN callback.
	</dd>

	<br>

	<dt>
	  <strong>verify</strong> <em>channel depth cert status error</em>
	</dt>
	<dd>
	  This form of callback is invoked by OpenSSL when a new certificate
	  is received from the peer. It allows the client to check the
	  certificate verification results and choose whether to continue
	  or not. It is called for each certificate in the certificate chain.
	  <ul>
	  <li>The <em>depth</em> argument is an integer representing the
	  current depth on the certificate chain, with
	  <code>0</code> as the peer certificate and higher values going
	  up to the Certificate Authority (CA).</li>
	  <li>The <em>cert</em> argument is a list of key-value pairs similar
	  to those returned by