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Document 'compile' extension script

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git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@5351 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
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teastep 2007-02-04 00:08:05 +00:00
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docs/CompiledPrograms.xml
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@ -99,6 +99,22 @@
<para>Bottom line: You probably want to use only constant values
for variables set in
<filename>/etc/shorewall/params</filename>.</para>
<para>To work around this, Shorewall 3.2.9 (Shorewall 3.4.0 RC2)
and later support a <firstterm>compile</firstterm> extension
script. This script is invoked during compiler initialization to
set shell variables needed at compile time. If you need the IP
address of eth0 on the firewall system, you can use this trick
in <filename>/etc/shorewall/compile</filename>:</para>
<programlisting>EXT_IP=$(ssh root@firewall "/sbin/shorewall-lite call find_first_interface_address eth0")</programlisting>
<para>The <command>shorewall-lite call</command> command allows
you to interactively call any function in
<filename>/etc/shorewall/functions</filename>
(<filename>/etc/shorewall/lib.bas</filename>e and
<filename>/etc/shorewall/lib.conf</filename> on Shorewall 3.4
and later).</para>
</listitem>
</itemizedlist>
</listitem>