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Describe use of BEGIN PERL .... END PERL in action bodies.

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Signed-off-by: Tom Eastep <teastep@shorewall.net>
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Tom Eastep 2012-12-16 09:06:29 -08:00
parent 1dc0f8b170
commit 6b758fd588
1 changed files with 48 additions and 1 deletions
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49
docs/Actions.xml
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@ -655,8 +655,55 @@ bar:debug</programlisting>
</orderedlist>
</section>
<section>
<title>Using BEGIN PERL .... END PERL in an Action</title>
<para>The Shorewall compiler provides a set of services that are available
to Perl code embedded in an action file.</para>
<variablelist>
<varlistentry>
<term>Shorewall::Config::get_action_params( $ )</term>
<listitem>
<para>This function returns an array containing the functions
parameters. The scalar argument is the number of parameters that you
expect to be passed. You can ensure that at least this many
parameters are passed by including a DEFAULTS line prior to the
embedded Perl.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Shorewall::Config::get_action_chain()</term>
<listitem>
<para>This function returns a reference to the chain table entry for
the current action chain.</para>
</listitem>
</varlistentry>
<varlistentry>
<term>Shorewall::Config::get_action_logging()</term>
<listitem>
<para>Returns a two-element list containing the the log level and
log tag specified when the action was invoked. Note that you must
use this function rather than @loglevel and @logtag within embedded
Perl, as the compiler does not expand <ulink
url="configuration_file_basics.html#ShorewallVariables">Shorewall
Variables</ulink> within embedded Perl (or embedded shell).</para>
</listitem>
</varlistentry>
</variablelist>
<para>For an example of using these services, look at the standard action
<filename>/usr/share/shorewall/action.dropBroadcast</filename>.</para>
</section>
<section id="Extension">
<title>Creating an Action using an Extension Script</title>
<title>Creating an Action using an Extension Script (deprecated in favor
of BEGIN PERL ... END PERL)</title>
<para>There may be cases where you wish to create a chain with rules that
can't be constructed using the tools defined in the