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<a name="SPA-Messages"></a>
<div class="header">
<p>
Next: <a href="Encryption-Algorithms.html#Encryption-Algorithms" accesskey="n" rel="next">Encryption Algorithms</a>, Previous: <a href="Digests.html#Digests" accesskey="p" rel="prev">Digests</a>, Up: <a href="SPA-Parameter-Types.html#SPA-Parameter-Types" accesskey="u" rel="up">SPA Parameter Types</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Concept-Index.html#Concept-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="SPA-Messages-1"></a>
<h4 class="subsection">2.3.2 SPA Messages</h4>
<a name="index-spa_002c-message-types"></a>
<a name="index-message-types"></a>

<p>The fwknop system (and subsequently libfko), support a specific set of
message types.  The message type value is used by fwknop to help determine
the correct message format and content.  These message types are:
</p>
<dl>
<dt><a name="index-fko_005fmessage_005ftype_005ft"></a>Variable: <em>int</em> <strong>fko_message_type_t</strong></dt>
<dd><dl compact="compact">
<dt><code>FKO_COMMAND_MSG</code></dt>
<dd><p>A request to have the fwknop server execute the given command.  The format
for this type is: &lsquo;<samp>&lt;ip of requestor&gt;,&lt;command text&gt;</samp>&rsquo;.
</p><div class="example">
<pre class="example">&quot;192.168.1.2,uname -a&quot;
</pre></div>

</dd>
<dt><code>FKO_ACCESS_MSG</code></dt>
<dd><p>A basic access request.  This is the most common type in use. The format
for this type is: &lsquo;<samp>&lt;ip of requestor&gt;,&lt;protocol&gt;/&lt;port&gt;</samp>&rsquo;.  Note that
mulitple protocol/port entries are allowed.
</p><div class="example">
<pre class="example">&quot;192.168.1.2,tcp/22&quot;
&quot;192.168.1.2,tcp/22,udp/5005&quot;
</pre></div>

</dd>
<dt><code>FKO_NAT_ACCESS_MSG</code></dt>
<dd><p>An access request that also provide information for the fwknop server
to create a Network Address Translation (<acronym>NAT</acronym> to an internal
address. The format for this string is: &lsquo;<samp>&lt;internal ip&gt;,&lt;ext nat port&gt;</samp>&rsquo;.
</p><div class="example">
<pre class="example">&quot;10.10.1.2,9922&quot;
</pre></div>

</dd>
<dt><code>FKO_CLIENT_TIMEOUT_ACCESS_MSG</code></dt>
<dd><p>This is an FKO_ACCESS_REQUEST with a timeout parameter for the fwknop server.
The timeout value is provided via the <code>client_timeout</code> data field.
</p>
</dd>
<dt><code>FKO_CLIENT_TIMEOUT_NAT_ACCESS_MSG</code></dt>
<dd><p>This is an FKO_NAT_ACCESS_REQUEST with a timeout parameter for the fwknop
server.  The timeout value is provided via the <code>client_timeout</code> data
field.
</p>
</dd>
<dt><code>FKO_LOCAL_NAT_ACCESS_MSG</code></dt>
<dd><p>This is similar to the FKO_NAT_ACCESS request except the <acronym>NAT</acronym> is
to the local to the server (i.e. a service listening on 127.0.0.1).
</p>
</dd>
<dt><code>FKO_CLIENT_TIMEOUT_LOCAL_NAT_ACCESS_MSG</code></dt>
<dd><p>This is an FKO_LOCAL_NAT_ACCESS_REQUEST with a timeout parameter for the
fwknop server.  The timeout value is provided via the <code>client_timeout</code>
data field.
</p></dd>
</dl>
</dd></dl>




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