mirror of
https://gitlab.com/shorewall/code.git
synced 2024-11-24 16:43:21 +01:00
dbfc838988
git-svn-id: https://shorewall.svn.sourceforge.net/svnroot/shorewall/trunk@789 fbd18981-670d-0410-9b5c-8dc0c1a9a2bb
90 lines
3.8 KiB
HTML
90 lines
3.8 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
|
|
<html>
|
|
<head>
|
|
<meta http-equiv="Content-Language" content="en-us">
|
|
<meta name="GENERATOR" content="Microsoft FrontPage 5.0">
|
|
<meta name="ProgId" content="FrontPage.Editor.Document">
|
|
<meta http-equiv="Content-Type"
|
|
content="text/html; charset=windows-1252">
|
|
<title>Shorewall Extension Scripts</title>
|
|
</head>
|
|
<body>
|
|
<h1 style="text-align: center;">Extension Scripts<br>
|
|
</h1>
|
|
<p>Extension scripts are user-provided scripts that are invoked at
|
|
various points during firewall start, restart, stop and clear. The
|
|
scripts are placed in /etc/shorewall and are processed using the Bourne
|
|
shell "source" mechanism.<br>
|
|
</p>
|
|
<p><font color="#ff0000"><b>Caution: <br>
|
|
</b></font></p>
|
|
<ol>
|
|
<li><font color="#ff0000"><b>Be sure that you actually need to use an
|
|
extension script to do what you want. Shorewall has a wide range of
|
|
features
|
|
that cover most requirements.</b></font></li>
|
|
<li><font color="#ff0000"><b>DO NOT SIMPLY COPY RULES THAT YOU FIND
|
|
ON THE NET INTO AN EXTENSION SCRIPT AND EXPECT THEM TO WORK AND TO NOT
|
|
BREAK SHOREWALL. TO USE SHOREWALL EXTENSION SCRIPTS YOU MUST KNOW WHAT
|
|
YOU ARE
|
|
DOING WITH RESPECT TO iptables/Netfilter</b></font></li>
|
|
</ol>
|
|
<p>The following scripts can be supplied:</p>
|
|
<ul>
|
|
<li>init -- invoked early in "shorewall start" and "shorewall restart"</li>
|
|
<li>start -- invoked after the firewall has been started or restarted.</li>
|
|
<li>stop -- invoked as a first step when the firewall is being
|
|
stopped.</li>
|
|
<li>stopped -- invoked after the firewall has been stopped.</li>
|
|
<li>clear -- invoked after the firewall has been cleared.</li>
|
|
<li>refresh -- invoked while the firewall is being refreshed but
|
|
before the common and/or blacklst chains have been rebuilt.</li>
|
|
<li>newnotsyn (added in version 1.3.6) -- invoked after the
|
|
'newnotsyn' chain has been created but before any rules have been added
|
|
to it.</li>
|
|
</ul>
|
|
<p><u><b>If your version of Shorewall doesn't have the file that you
|
|
want to use from the above list, you can simply create the file
|
|
yourself.</b></u></p>
|
|
<p> You can also supply a script with the same name as any of the
|
|
filter chains in the firewall and the script will be invoked after the
|
|
/etc/shorewall/rules file has been processed but before the
|
|
/etc/shorewall/policy file has been processed.</p>
|
|
<p>The /etc/shorewall/common file receives special treatment. If this
|
|
file is present, the rules that it defines will totally replace the
|
|
default rules in the common chain. These default rules are contained in
|
|
the file /etc/shorewall/common.def which may be used as a starting
|
|
point for making your own customized file.</p>
|
|
<p> Rather than running iptables directly, you should run it using the
|
|
function run_iptables. Similarly, rather than running "ip" directly,
|
|
you should use run_ip. These functions accept the same arguments as the
|
|
underlying command but cause the firewall to be stopped if an error
|
|
occurs during
|
|
processing of the command.</p>
|
|
<p> If you decide to create /etc/shorewall/common it is a good idea to
|
|
use the following technique</p>
|
|
<p> /etc/shorewall/common:</p>
|
|
<blockquote>
|
|
<pre>. /etc/shorewall/common.def<br><add your rules here></pre>
|
|
</blockquote>
|
|
<p>If you need to supercede a rule in the released common.def file, you
|
|
can add the superceding rule before the '.' command. Using this
|
|
technique allows you to add new rules while still getting the benefit
|
|
of the latest common.def file.</p>
|
|
<p>Remember that /etc/shorewall/common defines rules that are only
|
|
applied if the applicable policy is DROP or REJECT. These rules are NOT
|
|
applied if the policy is ACCEPT or CONTINUE<br>
|
|
</p>
|
|
<p> </p>
|
|
<p align="left"><font size="2">Last updated 6/30/2003 - <a
|
|
href="support.htm">Tom Eastep</a></font></p>
|
|
<p align="left"><a href="copyright.htm"><font size="2">Copyright 2002,
|
|
2003 Thomas M. Eastep</font></a></p>
|
|
<br>
|
|
<br>
|
|
<br>
|
|
<br>
|
|
<br>
|
|
</body>
|
|
</html>
|