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307 lines
9.4 KiB
XML
307 lines
9.4 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<article>
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<!--$Id$-->
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<articleinfo>
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<title>Shorewall Version 4</title>
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<authorgroup>
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<author>
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<firstname>Tom</firstname>
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<surname>Eastep</surname>
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</author>
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</authorgroup>
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<pubdate><?dbtimestamp format="Y/m/d"?></pubdate>
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<copyright>
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<year>2007</year>
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<holder>Thomas M. Eastep</holder>
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</copyright>
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<legalnotice>
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<para>Permission is granted to copy, distribute and/or modify this
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document under the terms of the GNU Free Documentation License, Version
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1.2 or any later version published by the Free Software Foundation; with
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no Invariant Sections, with no Front-Cover, and with no Back-Cover
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Texts. A copy of the license is included in the section entitled
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<quote><ulink url="GnuCopyright.htm">GNU Free Documentation
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License</ulink></quote>.</para>
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</legalnotice>
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</articleinfo>
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<section id="Intro">
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<title>Introduction</title>
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<para>Shorewall version 4 represents a substantial shift in direction for
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Shorewall. Up to now</para>
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<itemizedlist>
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<listitem>
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<para>Shorewall has been written entirely in Bourne Shell.</para>
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</listitem>
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<listitem>
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<para>Shorewall has run the <command>iptables</command> utility to add
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each Netfilter rule.</para>
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</listitem>
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</itemizedlist>
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<para>Shorewall version 4 offers you a choice. You can continue to use the
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existing shell-based implementation or you can use a new implementation of
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the Shorewall compiler written in the Perl programming language. The new
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compiler:</para>
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<itemizedlist>
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<listitem>
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<para>has a small disk footprint</para>
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</listitem>
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<listitem>
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<para>is very fast.</para>
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</listitem>
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<listitem>
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<para>generates a firewall script that uses
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<command>iptables-restore</command>; so the script is very
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fast.</para>
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</listitem>
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<listitem>
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<para>generates better and more consistent error messages.</para>
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</listitem>
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<listitem>
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<para>does a much more thorough job of checking the configuration to
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avoid run-time errors.</para>
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</listitem>
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</itemizedlist>
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<para>Both compilers may be installed on your system and you can use
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whichever one suits you in a particular case.</para>
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</section>
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<section id="Install">
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<title>Installing Shorewall Version 4</title>
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<para>Shorewall 4 contains four packages:</para>
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<itemizedlist>
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<listitem>
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<para>Shorewall-shell - the old shell-based compiler and related
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components.</para>
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</listitem>
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<listitem>
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<para>Shorewall-perl - the new Perl-based compiler.</para>
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</listitem>
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<listitem>
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<para>Shorewall-common - the part of Shorewall common to both
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compilers.</para>
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</listitem>
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<listitem>
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<para>Shorewall-lite- same as the 3.4 version of Shorewall Lite. Can
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run scripts generated by either Shorewall-perl or
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Shorewall-shell.</para>
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</listitem>
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</itemizedlist>
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<para>If you upgrade to Shorewall Version 4, you must install
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Shorewall-shell and/or Shorewall-perl; in fact, if you are using the
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tarball for your installation, you must install Shorewall-shell and/or
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Shorewall-perl <emphasis role="bold">before</emphasis> you upgrade
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Shorewall. See the <ulink url="upgrade_issues.htm">upgrade issues</ulink>
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for details.</para>
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</section>
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<section id="Prereqs">
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<title>Prerequisites for using the Shorewall Version 4 Perl-based
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Compiler</title>
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<itemizedlist>
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<listitem>
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<para>Perl (I use Perl 5.8.8 but other 5.8 versions should work
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fine)</para>
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</listitem>
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<listitem>
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<para>Perl Cwd Module</para>
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</listitem>
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<listitem>
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<para>Perl File::Basename Module</para>
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</listitem>
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<listitem>
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<para>Perl File::Temp Module</para>
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</listitem>
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<listitem>
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<para>Perl Getopt::Long Module</para>
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</listitem>
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<listitem>
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<para>Perl Carp Module</para>
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</listitem>
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<listitem>
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<para>Perl FindBin Module (Shorewall 4.0.3 and later)</para>
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</listitem>
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</itemizedlist>
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</section>
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<section id="Incompatibilities">
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<title>Incompatibilities Introduced in the Shorewall Version 4 Perl-based
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Compiler</title>
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<para>The Shorewall-perl compiler is not 100% compatible with the
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Shorewall-shell version. See <ulink url="Shorewall-perl.html">this
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document</ulink> for details.</para>
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</section>
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<section id="Compatibility">
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<title>Package Compatibility Matrix</title>
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<para>The following table indicates which versions of the compilers are
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supported by each version of Shorewall-common.</para>
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<informaltable>
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<tgroup cols="3">
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<colspec colname="_2" colnum="2" />
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<colspec colname="_3" />
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<tbody>
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<row>
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<entry align="center"><emphasis
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role="bold">Package</emphasis></entry>
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<entry align="center" nameend="_3" namest="_2"
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valign="middle"><emphasis role="bold">Compatible
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With</emphasis></entry>
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</row>
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<row>
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<entry>Shorewall-common 4.0.0-RC1</entry>
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<entry>Shorewall-shell 4.0.0-RC1</entry>
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<entry>Shorewall-perl 4.0.0-RC1</entry>
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</row>
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<row>
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<entry morerows="1" valign="middle">Shorewall-common
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4.0.0-RC2</entry>
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<entry>Shorewall-shell 4.0.0-RC1</entry>
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<entry>Shorewall-perl 4.0.0-RC1</entry>
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</row>
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<row>
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<entry>Shorewall-shell 4.0.0-RC2</entry>
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<entry>Shorewall-perl 4.0.0-RC2</entry>
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</row>
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<row>
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<entry valign="middle">Shorewall-common 4.0.0</entry>
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<entry>Shorewall-shell 4.0.0 - 4.0.3</entry>
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<entry>Shorewall-perl 4.0.0 - 4.0.2</entry>
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</row>
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<row>
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<entry valign="middle">Shorewall-common 4.0.1</entry>
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<entry>Shorewall-shell 4.0.0 - 4.0.3</entry>
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<entry>Shorewall-perl 4.0.0 - 4.0.1</entry>
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</row>
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<row>
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<entry valign="middle">Shorewall-common 4.0.2<footnote>
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<para>Shorewall-common/lib.base should have
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patch-common-4.0.2-1.diff applied.</para>
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</footnote></entry>
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<entry>Shorewall-shell 4.0.0 - 4.0.3</entry>
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<entry>Shorewall-perl 4.0.0 - 4.0.2</entry>
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</row>
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<row>
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<entry valign="middle">Shorewall-common 4.0.3</entry>
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<entry>Shorewall-shell 4.0.0 - 4.0.3</entry>
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<entry>Shorewall-perl 4.0.0 - 4.0.3<footnote>
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<para>Shorewall-perl 4.0.3 requires Shorewall-common 4.0.3 if
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capabilities files are to be used. Shorewall-perl 4.0.3 also
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requires Shorewall-lite 4.0.3.</para>
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</footnote></entry>
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</row>
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<row>
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<entry valign="middle">Shorewall-common 4.0.4</entry>
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<entry>Shorewall-shell 4.0.0 - 4.0.4</entry>
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<entry>Shorewall-perl 4.0.0 - 4.0.4<footnote>
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<para>Shorewall-perl 4.0.4 requires Shorewall-common 4.0.3 or
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later if capabilities files are to be used. Shorewall-perl
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4.0.4 also requires Shorewall-lite 4.0.3 or later.</para>
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</footnote></entry>
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</row>
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</tbody>
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</tgroup>
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</informaltable>
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</section>
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<section id="CompilerSelection">
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<title>Compiler Selection</title>
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<para>If you only install one compiler, then that compiler will be
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used.</para>
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<para>If you install both compilers, then the compiler actually used
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depends on the SHOREWALL_COMPILER setting in
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<filename>shorewall.conf</filename>.</para>
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<para>The value of this new option can be either 'perl' or 'shell'.</para>
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<para>If you add 'SHOREWALL_COMPILER=perl' to
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<filename>/etc/shorewall/shorewall.conf</filename> then by default, the
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new compiler will be used on the system. If you add it to
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<filename>shorewall.conf</filename> in a separate directory (such as a
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Shorewall-lite export directory) then the new compiler will only be used
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when you compile from that directory.</para>
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<para>If you only install one compiler, it is suggested that you do not
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set SHOREWALL_COMPILER.</para>
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<para>You can select the compiler to use on the command line using the 'C
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option:<simplelist>
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<member>'-C shell' means use the shell compiler</member>
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<member>'-C perl' means use the perl compiler</member>
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</simplelist>The -C option overrides the setting in
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shorewall.conf.</para>
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<para>Example:<programlisting><command>shorewall restart -C perl</command></programlisting></para>
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<para>When the Shorewall-perl compiler has been selected, the
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<filename>params</filename> file is processed using the
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<option>-a</option> option which causes all variables set within the file
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to be exported automatically by the shell. The Shorewall-perl compiler
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uses the current environmental variables to perform variable expansion
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within the other Shorewall configuration files.</para>
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</section>
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</article> |