path: root/lib/ssl/doc/src/ssl_app.xml

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  <header>
    <copyright>
      <year>1999</year><year>2015</year>
      <holder>Ericsson AB. All Rights Reserved.</holder>
    </copyright>
    <legalnotice>
      The contents of this file are subject to the Erlang Public License,
      Version 1.1, (the "License"); you may not use this file except in
      compliance with the License. You should have received a copy of the
      Erlang Public License along with this software. If not, it can be
      retrieved online at http://www.erlang.org/.

      Software distributed under the License is distributed on an "AS IS"
      basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
      the License for the specific language governing rights and limitations
      under the License.

    </legalnotice>

    <title>ssl</title>
    <prepared></prepared>
    <docno></docno>
    <date></date>
    <rev></rev>
    <file>ssl_app.sgml</file>
  </header>
  <app>ssl</app>
  <appsummary>The ssl application provides secure communication over
  sockets.</appsummary>

  <description></description>
  <section>
    <title>DEPENDENCIES</title>
    <p>The <c>ssl</c> application uses the <c>public_key</c> and
    <c>crypto</c> application to handle public keys and encryption, hence
    these applications must be loaded for the <c>ssl</c> application to work. 
    In an embedded environment this means they must be started with
    <c>application:start/[1,2]</c> before the <c>ssl</c> application is 
    started.</p>
  </section>

  <section>
    <title>CONFIGURATION</title>
    <p>The application environment configuration parameters in this section 
    are defined for the <c>ssl</c> application. For more information 
    about configuration parameters, see the 
    <seealso marker="kernel:application">application(3)</seealso>
    manual page in <c>kernel</c>.</p>

    <p>The environment parameters can be set on the command line,
    for example:</p>

    <p><c>erl -ssl protocol_version "['tlsv1.2', 'tlsv1.1']"</c></p>

    <taglist>
      <tag><c><![CDATA[protocol_version =  <seealso marker="kernel:error_logger">ssl:protocol()</seealso> <optional>]]></c>.</tag>
      <item><p>Protocol supported by started clients and
      servers. If this option is not set, it defaults to all
      protocols currently supported by the <c>ssl</c> application.
      This option can be overridden by the version option
      to <c>ssl:connect/[2,3]</c> and <c>ssl:listen/2</c>.</p></item>

      <tag><c><![CDATA[session_lifetime = integer() <optional>]]></c></tag>
      <item><p>Lifetime of the session data in seconds.</p></item>

      <tag><c><![CDATA[session_cb = atom() <optional>]]></c></tag>
      <item><p>Name of the session cache callback module that implements
      the <c>ssl_session_cache_api</c> behavior. Defaults to
      <c>ssl_session_cache.erl</c>.</p></item>

      <tag><c><![CDATA[session_cb_init_args = proplist:proplist() <optional>]]></c></tag>

      <item><p>List of extra user-defined arguments to the <c>init</c> function
      in the session cache callback module. Defaults to <c>[]</c>.</p></item>
      
      <tag><c><![CDATA[ssl_pem_cache_clean = integer() <optional>]]></c></tag>
      <item>
	<p>
	  Number of milliseconds between PEM cache validations.
	</p>
	<seealso
	    marker="ssl#clear_pem_cache-0">ssl:clear_pem_cache/0</seealso>
	
      </item>
    </taglist>
  </section>

  <section>
    <title>ERROR LOGGER AND EVENT HANDLERS</title>
    <p>The <c>ssl</c> applications uses the default <seealso marker="kernel:error_logger">OTP error logger</seealso> to log unexpected errors and TLS alerts. The logging of TLS alerts may be turned off with the <c>log_alert</c> option. </p>
  </section>

  <section>
    <title>SEE ALSO</title>
	<p><seealso marker="kernel:application">application(3)</seealso></p>
  </section>
  
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