shorewall_code/docs/Anatomy.xml

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  <!--$Id$-->

  <articleinfo>
    <title>Anatomy of Shorewall 4.5</title>

    <authorgroup>
      <author>
        <firstname>Tom</firstname>

        <surname>Eastep</surname>
      </author>
    </authorgroup>

    <pubdate><?dbtimestamp format="Y/m/d"?></pubdate>

    <copyright>
      <year>2007</year>

      <year>2009</year>

      <year>2012</year>

      <holder>Thomas M. Eastep</holder>
    </copyright>

    <legalnotice>
      <para>Permission is granted to copy, distribute and/or modify this
      document under the terms of the GNU Free Documentation License, Version
      1.2 or any later version published by the Free Software Foundation; with
      no Invariant Sections, with no Front-Cover, and with no Back-Cover
      Texts. A copy of the license is included in the section entitled
      <quote><ulink url="GnuCopyright.htm">GNU Free Documentation
      License</ulink></quote>.</para>
    </legalnotice>
  </articleinfo>

  <section id="Products">
    <title>Products</title>

    <para>Shorewall 4.5 consists of six packages.</para>

    <orderedlist>
      <listitem>
        <para><emphasis role="bold">Shorewall Core</emphasis>. This package
        contains the core Shorewall shell libraries and is required to install
        any of the other packages.</para>
      </listitem>

      <listitem>
        <para><emphasis role="bold">Shorewall</emphasis>. This package must be
        installed on at least one system in your network. It contains
        everything needed to create an IPv4 firewall.</para>
      </listitem>

      <listitem>
        <para><emphasis role="bold">Shorewall6</emphasis>. This package
        requires the Shorewall package and adds those components needed to
        create an IPv6 fireawall.</para>
      </listitem>

      <listitem>
        <para><emphasis role="bold">Shorewall-lite</emphasis>. Shorewall
        allows for central administration of multiple IPv4 firewalls through
        use of Shorewall lite. The full Shorewall product is installed on a
        central administrative system where compiled Shorewall scripts are
        generated. These scripts are copied to the firewall systems where they
        run under the control of Shorewall-lite.</para>
      </listitem>

      <listitem>
        <para><emphasis role="bold">Shorewall6-lite</emphasis>. Shorewall
        allows for central administration of multiple IPv4 firewalls through
        use of Shorewall lite. The full Shorewall product is installed on a
        central administrative system where compiled Shorewall scripts are
        generated. These scripts are copied to the firewall systems where they
        run under the control of Shorewall-lite.</para>
      </listitem>

      <listitem>
        <para>Shorewall-init. An add-on to any of the above packages that
        allows the firewall state to be altered in reaction to interfaces
        coming up and going down. Where Upstart is not being used, this
        package can also be configured to place the firewall in a safe state
        prior to bringing up the network interfaces.</para>
      </listitem>
    </orderedlist>
  </section>

  <section id="Shorewall">
    <title>Shorewall</title>

    <para>The Shorewall package includes a large number of files which are
    installed in <filename class="directory">/sbin</filename>, <filename
    class="directory">/usr/share/shorewall</filename>, <filename
    class="directory">/etc/shorewall</filename>,
    <filename>/etc/init.d</filename> and <filename
    class="directory">/var/lib/shorewall/</filename>. These are described in
    the sub-sections that follow.</para>

    <section id="sbin">
      <title>/sbin</title>

      <para>The <filename>/sbin/shorewall</filename> shell program is used to
      interact with Shorewall. See <ulink
      url="manpages/shorewall.html">shorewall</ulink>(8).</para>
    </section>

    <section id="share-shorewall">
      <title>/usr/share/shorewall</title>

      <para>The bulk of Shorewall is installed here.</para>

      <itemizedlist>
        <listitem>
          <para><filename>action.template</filename> - template file for
          creating <ulink url="Actions.html">actions</ulink>.</para>
        </listitem>

        <listitem>
          <para><filename>action.*</filename> - standard Shorewall
          actions.</para>
        </listitem>

        <listitem>
          <para><filename>actions.std</filename> - file listing the standard
          actions.</para>
        </listitem>

        <listitem>
          <para><filename>compiler.pl</filename> - The configuration compiler
          perl program.</para>
        </listitem>

        <listitem>
          <para><filename class="directory">configfiles</filename> - A
          directory containing configuration files to copy to create a <ulink
          url="Shorewall-Lite.html">Shorewall-lite export
          directory.</ulink></para>
        </listitem>

        <listitem>
          <para><filename><filename>configpath</filename></filename> - A file
          containing distribution-specific path assignments.</para>
        </listitem>

        <listitem>
          <para><filename>firewall</filename> - A shell program that handles
          the <command>add</command> and <command>delete</command> commands
          (see <ulink url="manpages/shorewall.html">shorewall</ulink>(8)). It
          also handles the <command>stop</command> and
          <command>clear</command> commands when there is no current compiled
          firewall script on the system.</para>
        </listitem>

        <listitem>
          <para><filename class="symlink">functions</filename> - A symbolic
          link to <filename>lib.base</filename> that provides for
          compatibility with older versions of Shorewall.</para>
        </listitem>

        <listitem>
          <para><filename class="symlink">init</filename> - A symbolic link to
          the init script (usually
          <filename>/etc/init.d/shorewall</filename>).</para>
        </listitem>

        <listitem>
          <para><filename>lib.*</filename> - Shell function libraries used by
          the other shell programs.</para>
        </listitem>

        <listitem>
          <para><filename>Macros/*</filename> - The standard Shorewall <ulink
          url="Macros.html">macros</ulink>.</para>
        </listitem>

        <listitem>
          <para><filename>modules.*</filename> - File that drives the loading
          of Netfilter kernel modules. May be overridden by
          <filename>/etc/shorewall/modules</filename>.</para>
        </listitem>

        <listitem>
          <para><filename>prog.*</filename> - Shell program fragments used as
          input to the compiler.</para>
        </listitem>

        <listitem>
          <para><filename class="directory">Shorewall</filename> - Directory
          containing the Shorewall Perl modules used by the compiler.</para>
        </listitem>

        <listitem>
          <para><filename>version</filename> - A file containing the currently
          install version of Shorewall.</para>
        </listitem>

        <listitem>
          <para><filename>wait4ifup</filename> - A shell program that <ulink
          url="shorewall_extension_scripts.htm">extension scripts</ulink> can
          use to delay until a network interface is available.</para>
        </listitem>
      </itemizedlist>
    </section>

    <section id="shorewall">
      <title>/etc/shorewall</title>

      <para>This is where the modifiable IPv4 configuration files are
      installed.</para>
    </section>

    <section id="init">
      <title>/etc/init.d or /etc/rc.d (depends on distribution)</title>

      <para>An init script is installed here. Depending on the distribution,
      it is named <filename>shorewall</filename> or
      <filename>rc.firewall</filename>.</para>
    </section>

    <section id="var">
      <title>/var/lib/shorewall</title>

      <para>Shorewall doesn't install any files in this directory but rather
      uses the directory for storing state information. This directory may be
      relocated using <ulink
      url="manpages/shorewall-vardir.html">shorewall-vardir</ulink>(5).</para>

      <itemizedlist>
        <listitem>
          <para><filename>.iptables-restore-input</filename> - The file passed
          as input to the iptables-restore program to initialize the firewall
          during the last <command>start</command> or
          <command>restart</command> command (see <ulink
          url="manpages/shorewall.html">shorewall</ulink>(8)).</para>
        </listitem>

        <listitem>
          <para><filename>.modules</filename> - The contents of the modules
          file used during the last <command>start</command> or
          <command>restart</command> command (see <ulink
          url="manpages/shorewall.html">shorewall</ulink>(8) for command
          information).</para>
        </listitem>

        <listitem>
          <para><filename>.modulesdir</filename> - The MODULESDIR setting
          (<ulink
          url="manpages/shorewall.conf.html">shorewall.conf</ulink>(5)) at the
          last <command>start</command> or <command>restart</command>.</para>
        </listitem>

        <listitem>
          <para><filename>nat</filename> - This unfortunately-named file
          records the IP addresses added by ADD_SNAT_ALIASES=Yes and
          ADD_IP_ALIASES=Yes in <ulink
          url="manpages/shorewall.conf.html">shorewall.conf</ulink>(5).</para>
        </listitem>

        <listitem>
          <para><filename>proxyarp</filename> - Records the arp entries added
          by entries in <ulink
          url="manpages/shorewall-proxyarp.html">shorewall-proxyarp</ulink>(5).</para>
        </listitem>

        <listitem>
          <para><filename>.refresh</filename> - The shell program that
          performed the last successful <command>refresh</command>
          command.</para>
        </listitem>

        <listitem>
          <para><filename>.restart</filename> - The shell program that
          performed the last successful <command>restart</command>
          command.</para>
        </listitem>

        <listitem>
          <para><filename>restore</filename> - The default shell program used
          to execute <command>restore</command> commands.</para>
        </listitem>

        <listitem>
          <para><filename>.restore</filename> - The shell program that
          performed the last successful <command>refresh, restart</command> or
          <command>start</command> command.</para>
        </listitem>

        <listitem>
          <para><filename>save</filename> - File created by the
          <command>save</command> command and used to restore the dynamic
          blacklist during <command>start/restart</command>.</para>
        </listitem>

        <listitem>
          <para><filename>.start</filename> - The shell program that performed
          the last successful <command>start</command> command.</para>
        </listitem>

        <listitem>
          <para><filename>state</filename> - Records the current firewall
          state.</para>
        </listitem>

        <listitem>
          <para><filename>zones</filename> - Records the current zone
          contents.</para>
        </listitem>
      </itemizedlist>
    </section>
  </section>

  <section id="Shorewall-perl">
    <title>Shorewall6</title>

    <para>Shorewall6 installs its files in a number of directories:</para>

    <section id="sbin6">
      <title>/sbin</title>

      <para>The <filename>/sbin/shorewall6</filename> shell program is used to
      interact with Shorewall6. See <ulink
      url="manpages6/shorewall6.html">shorewall6</ulink>(8).</para>
    </section>

    <section id="share-shorewall6">
      <title>/usr/share/shorewall6</title>

      <para>The bulk of Shorewall6 is installed here.</para>

      <itemizedlist>
        <listitem>
          <para><filename>action.template</filename> - template file for
          creating <ulink url="Actions.html">actions</ulink>.</para>
        </listitem>

        <listitem>
          <para><filename>action.*</filename> - standard Shorewall
          actions.</para>
        </listitem>

        <listitem>
          <para><filename>actions.std</filename> - file listing the standard
          actions.</para>
        </listitem>

        <listitem>
          <para><filename class="directory">configfiles</filename> - A
          directory containing configuration files to copy to create a <ulink
          url="Shorewall-Lite.html">Shorewall6-lite export
          directory.</ulink></para>
        </listitem>

        <listitem>
          <para><filename><filename>configpath</filename></filename> - A file
          containing distribution-specific path assignments.</para>
        </listitem>

        <listitem>
          <para><filename>firewall</filename> - A shell program that handles
          the <command>add</command> and <command>delete</command> commands
          (see <ulink url="manpages/shorewall.html">shorewall</ulink>(8)). It
          also handles the <command>stop</command> and
          <command>clear</command> commands when there is no current compiled
          firewall script on the system.</para>
        </listitem>

        <listitem>
          <para><filename class="symlink">functions</filename> - A symbolic
          link to <filename>lib.base</filename> that provides for
          compatibility with older versions of Shorewall.</para>
        </listitem>

        <listitem>
          <para><filename>lib.*</filename> - Shell function libraries used by
          the other shell programs.</para>
        </listitem>

        <listitem>
          <para><filename>Macros/*</filename> - The standard Shorewall6 <ulink
          url="Macros.html">macros</ulink>.</para>
        </listitem>

        <listitem>
          <para><filename>modules</filename> - File that drives the loading of
          Netfilter kernel modules. May be overridden by
          <filename>/etc/shorewall/modules</filename>.</para>
        </listitem>

        <listitem>
          <para><filename>version</filename> - A file containing the currently
          install version of Shorewall.</para>
        </listitem>

        <listitem>
          <para><filename>wait4ifup</filename> - A shell program that <ulink
          url="shorewall_extension_scripts.htm">extension scripts</ulink> can
          use to delay until a network interface is available.</para>
        </listitem>
      </itemizedlist>
    </section>

    <section id="etc-shorewall6">
      <title>/etc/shorewall6</title>

      <para>This is where the modifiable IPv6 configuration files are
      installed.</para>
    </section>

    <section id="var-shorewall6">
      <title>/var/lib/shorewall6</title>

      <para>Shorewall6 doesn't install any files in this directory but rather
      uses the directory for storing state information. This directory may be
      relocated using <ulink
      url="manpages/shorewall-vardir.html">shorewall-vardir</ulink>(5).</para>

      <itemizedlist>
        <listitem>
          <para><filename>.ip6tables-restore-input</filename> - The file
          passed as input to the ip6tables-restore program to initialize the
          firewall during the last <command>start</command> or
          <command>restart</command> command (see <ulink
          url="manpages6/shorewall6.html">shorewall6</ulink>(8)).</para>
        </listitem>

        <listitem>
          <para><filename>.modules</filename> - The contents of the modules
          file used during the last <command>start</command> or
          <command>restart</command> command (see <ulink
          url="manpages6/shorewall6.html">shorewall</ulink>(8) for command
          information).</para>
        </listitem>

        <listitem>
          <para><filename>.modulesdir</filename> - The MODULESDIR setting
          (<ulink
          url="manpages/shorewall.conf.html">shorewall.conf</ulink>(5)) at the
          last <command>start</command> or <command>restart</command>.</para>
        </listitem>

        <listitem>
          <para><filename>.refresh</filename> - The shell program that
          performed the last successful <command>refresh</command>
          command.</para>
        </listitem>

        <listitem>
          <para><filename>.restart</filename> - The shell program that
          performed the last successful <command>restart</command>
          command.</para>
        </listitem>

        <listitem>
          <para><filename>restore</filename> - The default shell program used
          to execute <command>restore</command> commands.</para>
        </listitem>

        <listitem>
          <para><filename>.restore</filename> - The shell program that
          performed the last successful <command>refresh, restart</command> or
          <command>start</command> command.</para>
        </listitem>

        <listitem>
          <para><filename>save</filename> - File created by the
          <command>save</command> command and used to restore the dynamic
          blacklist during <command>start/restart</command>.</para>
        </listitem>

        <listitem>
          <para><filename>.start</filename> - The shell program that performed
          the last successful <command>start</command> command.</para>
        </listitem>

        <listitem>
          <para><filename>state</filename> - Records the current firewall
          state.</para>
        </listitem>

        <listitem>
          <para><filename>zones</filename> - Records the current zone
          contents.</para>
        </listitem>
      </itemizedlist>
    </section>
  </section>

  <section id="Shorewall-lite">
    <title>Shorewall-lite</title>

    <para>The Shorewall-lite product includes files installed in <filename
    class="directory">/sbin</filename>, <filename
    class="directory">/usr/share/shorewall-lite</filename>, <filename
    class="directory">/etc/shorewall-lite</filename>,
    <filename>/etc/init.d</filename> and <filename
    class="directory">/var/lib/shorewall-lite/</filename>. These are described
    in the sub-sections that follow.</para>

    <section id="sbin-lite">
      <title>/sbin</title>

      <para>The <filename>/sbin/shorewall-lite</filename> shell program is use
      to interact with Shorewall lite. See <ulink
      url="manpages/shorewall-lite.html">shorewall-lite</ulink>(8).</para>
    </section>

    <section id="init-lite">
      <title>/etc/init.d or /etc/rc.d (depends on distribution)</title>

      <para>An init script is installed here. Depending on the distribution,
      it is named <filename>shorewall-lite</filename> or
      <filename>rc.firewall</filename>.</para>
    </section>

    <section id="shorewall-lite">
      <title>/etc/shorewall-lite</title>

      <para>This is where the modifiable configuration files are
      installed.</para>
    </section>

    <section id="share-lite">
      <title>/usr/share/shorewall-lite</title>

      <para>The bulk of Shorewall-lite is installed here.</para>

      <itemizedlist>
        <listitem>
          <para><filename><filename>configpath</filename></filename> - A file
          containing distribution-specific path assignments.</para>
        </listitem>

        <listitem>
          <para><filename class="symlink">functions</filename> - A symbolic
          link to <filename>lib.base</filename> that provides for
          compatibility with older versions of Shorewall.</para>
        </listitem>

        <listitem>
          <para><filename>lib.base</filename> - Shell function librarie used
          by the other shell programs. This is a thin wrapper around
          <filename>/usr/share/shorewall/lib.base</filename>.</para>
        </listitem>

        <listitem>
          <para><filename>modules</filename>* - Files that drive the loading
          of Netfilter kernel modules. May be overridden by
          <filename>/etc/shorewall-lite/modules</filename>.</para>
        </listitem>

        <listitem>
          <para><filename>shorecap</filename> - A shell program used for
          generating capabilities files. See the <ulink
          url="Shorewall-Lite.html">Shorewall-lite
          documentation</ulink>.</para>
        </listitem>

        <listitem>
          <para><filename>version</filename> - A file containing the currently
          install version of Shorewall.</para>
        </listitem>

        <listitem>
          <para><filename>wait4ifup</filename> - A shell program that <ulink
          url="shorewall_extension_scripts.htm">extension scripts</ulink> can
          use to delay until a network interface is available.</para>
        </listitem>
      </itemizedlist>
    </section>

    <section id="var-lite">
      <title>/var/lib/shorewall-lite</title>

      <para>Shorewall-lite doesn't install any files in this directory but
      rather uses the directory for storing state information. This directory
      may be relocated using <ulink
      url="manpages/shorewall-lite-vardir.html">shorewall-lite-vardir</ulink>(5).</para>

      <itemizedlist>
        <listitem>
          <para><filename>firewall</filename> - Compiled shell script
          installed by running the load or reload command on the
          administrative system (see <ulink
          url="manpages/shorewall.html">shorewall</ulink>(8)).</para>
        </listitem>

        <listitem>
          <para><filename>firewall.conf</filename> - Digest of the
          shorewall.conf file used to compile the firewall script on the
          administrative system.</para>
        </listitem>
      </itemizedlist>

      <itemizedlist>
        <listitem>
          <para><filename>.iptables-restore-input</filename> - The file passed
          as input to the iptables-restore program to initialize the firewall
          during the last <command>start</command> or
          <command>restart</command> command (see <ulink
          url="manpages/shorewall-lite.html">shorewall-lite</ulink>(8)).</para>
        </listitem>

        <listitem>
          <para><filename>.modules</filename> - The contents of the modules
          file used during the last <command>start</command> or
          <command>restart</command> command (see <ulink
          url="manpages/shorewall-lite.html">shorewall-lite</ulink>(8) for
          command information).</para>
        </listitem>

        <listitem>
          <para><filename>.modulesdir</filename> - The MODULESDIR setting
          (<ulink
          url="manpages/shorewall.conf.html">shorewall.conf</ulink>(5)) at the
          last <command>start</command> or <command>restart.</command></para>
        </listitem>

        <listitem>
          <para><filename>nat</filename> - This unfortunately-named file
          records the IP addresses added by ADD_SNAT_ALIASES=Yes and
          ADD_IP_ALIASES=Yes in <ulink
          url="manpages/shorewall.conf.html">shorewall.conf</ulink>(5).</para>
        </listitem>

        <listitem>
          <para><filename>proxyarp</filename> - Records the arp entries added
          by entries in <ulink
          url="manpages/shorewall-proxyarp.html">shorewall-proxyarp</ulink>(5).</para>
        </listitem>

        <listitem>
          <para><filename>.refresh</filename> - The shell program that
          performed the last successful <command>refresh</command>
          command.</para>
        </listitem>

        <listitem>
          <para><filename>.restart</filename> - The shell program that
          performed the last successful <command>restart</command>
          command.</para>
        </listitem>

        <listitem>
          <para><filename>restore</filename> - The default shell program used
          to execute <command>restore</command> commands.</para>
        </listitem>

        <listitem>
          <para><filename>.restore</filename> - The shell program that
          performed the last successful <command>refresh, restart</command> or
          <command>start</command> command.</para>
        </listitem>

        <listitem>
          <para><filename>save</filename> - File created by the
          <command>save</command> command and used to restore the dynamic
          blacklist during <command>start/restart</command>.</para>
        </listitem>

        <listitem>
          <para><filename>.start</filename> - The shell program that performed
          the last successful <command>start</command> command.</para>
        </listitem>

        <listitem>
          <para><filename>state</filename> - Records the current firewall
          state.</para>
        </listitem>

        <listitem>
          <para><filename>zones</filename> - Records the current zone
          contents.</para>
        </listitem>
      </itemizedlist>
    </section>
  </section>

  <section id="Shorewall6-lite">
    <title>Shorewall6-lite</title>

    <para>The Shorewall6-lite product includes files installed in <filename
    class="directory">/sbin</filename>, <filename
    class="directory">/usr/share/shorewall6-lite</filename>, <filename
    class="directory">/etc/shorewall6-lite</filename>,
    <filename>/etc/init.d</filename> and <filename
    class="directory">/var/lib/shorewall6-lite/</filename>. These are
    described in the sub-sections that follow.</para>

    <section id="sbin-lite6">
      <title>/sbin</title>

      <para>The <filename>/sbin/shorewall6-lite</filename> shell program is
      use to interact with Shorewall lite. See <ulink
      url="manpages6/shorewall6-lite.html">shorewall6-lite</ulink>(8).</para>
    </section>

    <section id="init-lite6">
      <title>/etc/init.d or /etc/rc.d (depends on distribution)</title>

      <para>An init script is installed here. Depending on the distribution,
      it is named <filename>shorewall6-lite</filename> or
      <filename>rc.firewall</filename>.</para>
    </section>

    <section id="etc-shorewall6-lite">
      <title>/etc/shorewall6-lite</title>

      <para>This is where the modifiable configuration files are
      installed.</para>
    </section>

    <section id="share-lite6">
      <title>/usr/share/shorewall6-lite</title>

      <para>The bulk of Shorewall-lite is installed here.</para>

      <itemizedlist>
        <listitem>
          <para><filename><filename>configpath</filename></filename> - A file
          containing distribution-specific path assignments.</para>
        </listitem>

        <listitem>
          <para><filename class="symlink">functions</filename> - A symbolic
          link to <filename>lib.base</filename> that provides for
          compatibility with older versions of Shorewall.</para>
        </listitem>

        <listitem>
          <para><filename>lib.base</filename> - Shell function librarie used
          by the other shell programs. This is a thin wrapper around
          <filename>/usr/share/shorewall/lib.base</filename>.</para>
        </listitem>

        <listitem>
          <para><filename>modules</filename>* - Files that drive the loading
          of Netfilter kernel modules. May be overridden by
          <filename>/etc/shorewall-lite/modules</filename>.</para>
        </listitem>

        <listitem>
          <para><filename>shorecap</filename> - A shell program used for
          generating capabilities files. See the <ulink
          url="Shorewall-Lite.html">Shorewall-lite
          documentation</ulink>.</para>
        </listitem>

        <listitem>
          <para><filename>version</filename> - A file containing the currently
          install version of Shorewall.</para>
        </listitem>

        <listitem>
          <para><filename>wait4ifup</filename> - A shell program that <ulink
          url="shorewall_extension_scripts.htm">extension scripts</ulink> can
          use to delay until a network interface is available.</para>
        </listitem>
      </itemizedlist>
    </section>

    <section id="var-lite6">
      <title>/var/lib/shorewall6-lite</title>

      <para>Shorewall6-lite doesn't install any files in this directory but
      rather uses the directory for storing state information. This directory
      may be relocated using <ulink
      url="manpages/shorewall-lite-vardir.html">shorewall-lite-vardir</ulink>(5).</para>

      <itemizedlist>
        <listitem>
          <para><filename>firewall</filename> - Compiled shell script
          installed by running the load or reload command on the
          administrative system (see <ulink
          url="manpages/shorewall.html">shorewall6</ulink>(8)).</para>
        </listitem>

        <listitem>
          <para><filename>firewall.conf</filename> - Digest of the
          shorewall.conf file used to compile the firewall script on the
          administrative system.</para>
        </listitem>
      </itemizedlist>

      <itemizedlist>
        <listitem>
          <para><filename>.ip6tables-restore-input</filename> - The file
          passed as input to the ip6tables-restore program to initialize the
          firewall during the last <command>start</command> or
          <command>restart</command> command (see <ulink
          url="manpages/shorewall-lite.html">shorewall-lite</ulink>(8)).</para>
        </listitem>

        <listitem>
          <para><filename>.modules</filename> - The contents of the modules
          file used during the last <command>start</command> or
          <command>restart</command> command (see <ulink
          url="manpages/shorewall-lite.html">shorewall-lite</ulink>(8) for
          command information).</para>
        </listitem>

        <listitem>
          <para><filename>.modulesdir</filename> - The MODULESDIR setting
          (<ulink
          url="manpages/shorewall.conf.html">shorewall.conf</ulink>(5)) at the
          last <command>start</command> or <command>restart.</command></para>
        </listitem>

        <listitem>
          <para><filename>.refresh</filename> - The shell program that
          performed the last successful <command>refresh</command>
          command.</para>
        </listitem>

        <listitem>
          <para><filename>.restart</filename> - The shell program that
          performed the last successful <command>restart</command>
          command.</para>
        </listitem>

        <listitem>
          <para><filename>restore</filename> - The default shell program used
          to execute <command>restore</command> commands.</para>
        </listitem>

        <listitem>
          <para><filename>.restore</filename> - The shell program that
          performed the last successful <command>refresh, restart</command> or
          <command>start</command> command.</para>
        </listitem>

        <listitem>
          <para><filename>save</filename> - File created by the
          <command>save</command> command and used to restore the dynamic
          blacklist during <command>start/restart</command>.</para>
        </listitem>

        <listitem>
          <para><filename>.start</filename> - The shell program that performed
          the last successful <command>start</command> command.</para>
        </listitem>

        <listitem>
          <para><filename>state</filename> - Records the current firewall
          state.</para>
        </listitem>

        <listitem>
          <para><filename>zones</filename> - Records the current zone
          contents.</para>
        </listitem>
      </itemizedlist>
    </section>
  </section>
</article>