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* plugins.d/mandos-client.c (avahi_loop_with_timeout): Fix warning.
  (main): Disallow "--retry" arguments < 0.  Allow brackets [] around
          IPv6 addresses, as recommended by RFC 5952.  Bug fix: When
          using --connect, really use retry_interval, not 1 second.
* plugins.d/mandos-client.xml (DESCRIPTION): Add retry info.
  (--retry): Remove repeated word.

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plugins.d/mandos-client.xml
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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        "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
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<!ENTITY COMMANDNAME "mandos-client">
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<!ENTITY TIMESTAMP "2012-01-01">
 
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<!ENTITY TIMESTAMP "2010-09-26">
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<!ENTITY % common SYSTEM "../common.ent">
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%common;
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]>
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        <firstname>Björn</firstname>
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        <surname>Påhlsson</surname>
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        <address>
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          <email>belorn@recompile.se</email>
 
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          <email>belorn@fukt.bsnet.se</email>
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        </address>
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      </author>
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      <author>
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        <firstname>Teddy</firstname>
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        <surname>Hogeborn</surname>
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        <address>
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          <email>teddy@recompile.se</email>
 
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          <email>teddy@fukt.bsnet.se</email>
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        </address>
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      </author>
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    </authorgroup>
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    <copyright>
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      <year>2008</year>
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      <year>2009</year>
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      <year>2012</year>
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      <holder>Teddy Hogeborn</holder>
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      <holder>Björn Påhlsson</holder>
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    </copyright>
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      </arg>
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      <sbr/>
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      <arg>
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        <option>--network-hook-dir
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        <replaceable>DIR</replaceable></option>
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      </arg>
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      <sbr/>
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      <arg>
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        <option>--debug</option>
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      </arg>
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    </cmdsynopsis>
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      will wait indefinitely for new servers to appear.
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    </para>
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    <para>
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      The network interface is selected like this: If an interface is
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      specified using the <option>--interface</option> option, that
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      interface is used.  Otherwise, <command>&COMMANDNAME;</command>
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      will choose any interface that is up and running and is not a
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      loopback interface, is not a point-to-point interface, is
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      capable of broadcasting and does not have the NOARP flag (see
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      <citerefentry><refentrytitle>netdevice</refentrytitle>
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      <manvolnum>7</manvolnum></citerefentry>).  (If the
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      <option>--connect</option> option is used, point-to-point
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      interfaces and non-broadcast interfaces are accepted.)  If no
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      acceptable interfaces are found, re-run the check but without
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      the <quote>up and running</quote> requirement, and manually take
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      the selected interface up (and later take it down on program
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      exit).
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    </para>
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    <para>
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      Before a network interface is selected, all <quote>network
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      hooks</quote> are run; see <xref linkend="network-hooks"/>.
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    </para>
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    <para>
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      This program is not meant to be run directly; it is really meant
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      to run as a plugin of the <application>Mandos</application>
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      <citerefentry><refentrytitle>plugin-runner</refentrytitle>
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            can not be a pseudo-interface such as <quote>br0</quote>
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            or <quote>tun0</quote>; such interfaces will not exist
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            until much later in the boot process, and can not be used
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            by this program, unless created by a <quote>network
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            hook</quote> — see <xref linkend="network-hooks"/>.
 
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            by this program.
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          </para>
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          <para>
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            <replaceable>NAME</replaceable> can be the string
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--network-hook-dir=<replaceable
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        >DIR</replaceable></option></term>
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        <listitem>
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          <para>
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            Network hook directory.  The default directory is
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            <quote><filename class="directory"
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            >/lib/mandos/network-hooks.d</filename></quote>.
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><option>--debug</option></term>
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      <refentrytitle>plugin-runner</refentrytitle>
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      <manvolnum>8mandos</manvolnum></citerefentry>) is used to run
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      both this program and others in in parallel,
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      <emphasis>one</emphasis> of which (<citerefentry>
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      <refentrytitle>password-prompt</refentrytitle>
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      <manvolnum>8mandos</manvolnum></citerefentry>) will prompt for
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      passwords on the system console.
 
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      <emphasis>one</emphasis> of which will prompt for passwords on
 
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      the system console.
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    </para>
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  </refsect1>
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    </para>
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  </refsect1>
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  <refsect1 id="network-hooks">
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    <title>NETWORK HOOKS</title>
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    <para>
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      If a network interface like a bridge or tunnel is required to
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      find a Mandos server, this requires the interface to be up and
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      running before <command>&COMMANDNAME;</command> starts looking
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      for Mandos servers.  This can be accomplished by creating a
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      <quote>network hook</quote> program, and placing it in a special
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      directory.
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    </para>
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    <para>
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      Before the network is used (and again before program exit), any
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      runnable programs found in the network hook directory are run
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      with the argument <quote><literal>start</literal></quote> or
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      <quote><literal>stop</literal></quote>.  This should bring up or
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      down, respectively, any network interface which
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      <command>&COMMANDNAME;</command> should use.
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    </para>
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    <refsect2 id="hook-requirements">
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      <title>REQUIREMENTS</title>
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      <para>
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        A network hook must be an executable file, and its name must
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        consist entirely of upper and lower case letters, digits,
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        underscores, periods, and hyphens.
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      </para>
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      <para>
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        A network hook will receive one argument, which can be one of
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        the following:
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      </para>
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      <variablelist>
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        <varlistentry>
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          <term><literal>start</literal></term>
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          <listitem>
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            <para>
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              This should make the network hook create (if necessary)
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              and bring up a network interface.
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            </para>
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          </listitem>
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        </varlistentry>
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        <varlistentry>
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          <term><literal>stop</literal></term>
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          <listitem>
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            <para>
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              This should make the network hook take down a network
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              interface, and delete it if it did not exist previously.
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            </para>
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          </listitem>
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        </varlistentry>
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        <varlistentry>
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          <term><literal>files</literal></term>
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          <listitem>
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            <para>
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              This should make the network hook print, <emphasis>one
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              file per line</emphasis>, all the files needed for it to
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              run.  (These files will be copied into the initial RAM
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              filesystem.)  Typical use is for a network hook which is
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              a shell script to print its needed binaries.
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            </para>
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            <para>
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              It is not necessary to print any non-executable files
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              already in the network hook directory, these will be
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              copied implicitly if they otherwise satisfy the name
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              requirement.
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            </para>
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          </listitem>
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        </varlistentry>
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        <varlistentry>
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          <term><literal>modules</literal></term>
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          <listitem>
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            <para>
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              This should make the network hook print, <emphasis>on
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              separate lines</emphasis>, all the kernel modules needed
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              for it to run.  (These modules will be copied into the
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              initial RAM filesystem.)  For instance, a tunnel
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              interface needs the
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              <quote><literal>tun</literal></quote> module.
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            </para>
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          </listitem>
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        </varlistentry>
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      </variablelist>
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      <para>
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        The network hook will be provided with a number of environment
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        variables:
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      </para>
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      <variablelist>
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        <varlistentry>
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          <term><envar>MANDOSNETHOOKDIR</envar></term>
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          <listitem>
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            <para>
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              The network hook directory, specified to
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              <command>&COMMANDNAME;</command> by the
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              <option>--network-hook-dir</option> option.  Note: this
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              should <emphasis>always</emphasis> be used by the
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              network hook to refer to itself or any files in the hook
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              directory it may require.
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            </para>
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          </listitem>
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        </varlistentry>
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        <varlistentry>
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          <term><envar>DEVICE</envar></term>
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          <listitem>
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            <para>
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              The network interface, as specified to
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              <command>&COMMANDNAME;</command> by the
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              <option>--interface</option> option.  If this is not the
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              interface a hook will bring up, there is no reason for a
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              hook to continue.
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            </para>
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          </listitem>
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        </varlistentry>
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        <varlistentry>
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          <term><envar>MODE</envar></term>
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          <listitem>
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            <para>
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              This will be the same as the first argument;
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              i.e. <quote><literal>start</literal></quote>,
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              <quote><literal>stop</literal></quote>,
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              <quote><literal>files</literal></quote>, or
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              <quote><literal>modules</literal></quote>.
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            </para>
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          </listitem>
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        </varlistentry>
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        <varlistentry>
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          <term><envar>VERBOSITY</envar></term>
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          <listitem>
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            <para>
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              This will be the <quote><literal>1</literal></quote> if
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              the <option>--debug</option> option is passed to
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              <command>&COMMANDNAME;</command>, otherwise
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              <quote><literal>0</literal></quote>.
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            </para>
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          </listitem>
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        </varlistentry>
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        <varlistentry>
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          <term><envar>DELAY</envar></term>
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          <listitem>
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            <para>
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              This will be the same as the <option>--delay</option>
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              option passed to <command>&COMMANDNAME;</command>.  Is
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              only set if <envar>MODE</envar> is
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              <quote><literal>start</literal></quote> or
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              <quote><literal>stop</literal></quote>.
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            </para>
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          </listitem>
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        </varlistentry>
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        <varlistentry>
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          <term><envar>CONNECT</envar></term>
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          <listitem>
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            <para>
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              This will be the same as the <option>--connect</option>
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              option passed to <command>&COMMANDNAME;</command>.  Is
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              only set if <option>--connect</option> is passed and
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              <envar>MODE</envar> is
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              <quote><literal>start</literal></quote> or
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              <quote><literal>stop</literal></quote>.
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            </para>
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          </listitem>
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        </varlistentry>
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      </variablelist>
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      <para>
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        A hook may not read from standard input, and should be
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        restrictive in printing to standard output or standard error
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        unless <varname>VERBOSITY</varname> is
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        <quote><literal>1</literal></quote>.
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      </para>
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    </refsect2>
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  </refsect1>
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  <refsect1 id="files">
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    <title>FILES</title>
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    <variablelist>
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          </para>
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        </listitem>
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      </varlistentry>
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      <varlistentry>
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        <term><filename
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        class="directory">/lib/mandos/network-hooks.d</filename></term>
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        <listitem>
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          <para>
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            Directory where network hooks are located.  Change this
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            with the <option>--network-hook-dir</option> option.  See
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            <xref linkend="network-hooks"/>.
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          </para>
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        </listitem>
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      </varlistentry>
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    </variablelist>
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  </refsect1>
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  <refsect1 id="see_also">
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    <title>SEE ALSO</title>
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    <para>
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      <citerefentry><refentrytitle>intro</refentrytitle>
759
 
      <manvolnum>8mandos</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>cryptsetup</refentrytitle>
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      <manvolnum>8</manvolnum></citerefentry>,
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      <citerefentry><refentrytitle>crypttab</refentrytitle>