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<refentry xmlns="http://docbook.org/ns/docbook" version="5.0" xml:id="man.dnssec-coverage">

  <info>

    <date>2014-01-11</date>

  </info>

  <refentryinfo>

    <corpname>ISC</corpname>

    <corpauthor>Internet Systems Consortium, Inc.</corpauthor>

  </refentryinfo>

  <refmeta>

    <refentrytitle><application>dnssec-coverage</application></refentrytitle>

    <manvolnum>8</manvolnum>

    <refmiscinfo>BIND9</refmiscinfo>

  </refmeta>

  <refnamediv>

    <refname><application>dnssec-coverage</application></refname>

    <refpurpose>checks future DNSKEY coverage for a zone</refpurpose>

  </refnamediv>

  <docinfo>

    <copyright>

      <year>2013</year>

      <year>2014</year>

      <year>2015</year>

      <year>2016</year>

      <year>2018</year>

      <year>2019</year>

      <year>2020</year>

      <holder>Internet Systems Consortium, Inc. ("ISC")</holder>

    </copyright>

  </docinfo>

  <refsynopsisdiv>

    <cmdsynopsis sepchar=" ">

      <command>dnssec-coverage</command>

      <arg choice="opt" rep="norepeat"><option>-K <replaceable class="parameter">directory</replaceable></option></arg>

      <arg choice="opt" rep="norepeat"><option>-l <replaceable class="parameter">length</replaceable></option></arg>

      <arg choice="opt" rep="norepeat"><option>-f <replaceable class="parameter">file</replaceable></option></arg>

      <arg choice="opt" rep="norepeat"><option>-d <replaceable class="parameter">DNSKEY TTL</replaceable></option></arg>

      <arg choice="opt" rep="norepeat"><option>-m <replaceable class="parameter">max TTL</replaceable></option></arg>

      <arg choice="opt" rep="norepeat"><option>-r <replaceable class="parameter">interval</replaceable></option></arg>

      <arg choice="opt" rep="norepeat"><option>-c <replaceable class="parameter">compilezone path</replaceable></option></arg>

      <arg choice="opt" rep="norepeat"><option>-k</option></arg>

      <arg choice="opt" rep="norepeat"><option>-z</option></arg>

      <arg choice="opt" rep="repeat">zone</arg>

    </cmdsynopsis>

  </refsynopsisdiv>

  <refsection><info><title>DESCRIPTION</title></info>

    <para><command>dnssec-coverage</command>

      verifies that the DNSSEC keys for a given zone or a set of zones

      have timing metadata set properly to ensure no future lapses in DNSSEC

      coverage.

    </para>

    <para>

      If <option>zone</option> is specified, then keys found in

      the key repository matching that zone are scanned, and an ordered

      list is generated of the events scheduled for that key (i.e.,

      publication, activation, inactivation, deletion).  The list of

      events is walked in order of occurrence.  Warnings are generated

      if any event is scheduled which could cause the zone to enter a

      state in which validation failures might occur: for example, if

      the number of published or active keys for a given algorithm drops

      to zero, or if a key is deleted from the zone too soon after a new

      key is rolled, and cached data signed by the prior key has not had

      time to expire from resolver caches.

    </para>

    <para>

      If <option>zone</option> is not specified, then all keys in the

      key repository will be scanned, and all zones for which there are

      keys will be analyzed.  (Note: This method of reporting is only

      accurate if all the zones that have keys in a given repository

      share the same TTL parameters.)

    </para>

  </refsection>

  <refsection><info><title>OPTIONS</title></info>

    <variablelist>

      <varlistentry>

        <term>-K <replaceable class="parameter">directory</replaceable></term>

        <listitem>

          <para>

            Sets the directory in which keys can be found.  Defaults to the

            current working directory.

          </para>

        </listitem>

      </varlistentry>

      <varlistentry>

        <term>-f <replaceable class="parameter">file</replaceable></term>

        <listitem>

          <para>

            If a <option>file</option> is specified, then the zone is

            read from that file; the largest TTL and the DNSKEY TTL are

            determined directly from the zone data, and the

            <option>-m</option> and <option>-d</option> options do

            not need to be specified on the command line.

          </para>

        </listitem>

      </varlistentry>

      <varlistentry>

        <term>-l <replaceable class="parameter">duration</replaceable></term>

        <listitem>

          <para>

            The length of time to check for DNSSEC coverage.  Key events

            scheduled further into the future than <option>duration</option>

            will be ignored, and assumed to be correct.

          </para>

          <para>

            The value of <option>duration</option> can be set in seconds,

            or in larger units of time by adding a suffix: 'mi' for minutes,

            'h' for hours, 'd' for days, 'w' for weeks, 'mo' for months,

            'y' for years.

          </para>

        </listitem>

      </varlistentry>

      <varlistentry>

        <term>-m <replaceable class="parameter">maximum TTL</replaceable></term>

        <listitem>

          <para>

            Sets the value to be used as the maximum TTL for the zone or

            zones being analyzed when determining whether there is a

            possibility of validation failure.  When a zone-signing key is

            deactivated, there must be enough time for the record in the

            zone with the longest TTL to have expired from resolver caches

            before that key can be purged from the DNSKEY RRset.  If that

            condition does not apply, a warning will be generated.

          </para>

          <para>

            The length of the TTL can be set in seconds, or in larger units

            of time by adding a suffix: 'mi' for minutes, 'h' for hours,

            'd' for days, 'w' for weeks, 'mo' for months, 'y' for years.

          </para>

          <para>

            This option is not necessary if the <option>-f</option> has

            been used to specify a zone file.  If <option>-f</option> has

            been specified, this option may still be used; it will override

            the value found in the file.

          </para>

          <para>

            If this option is not used and the maximum TTL cannot be retrieved

            from a zone file, a warning is generated and a default value of

            1 week is used.

          </para>

        </listitem>

      </varlistentry>

      <varlistentry>

        <term>-d <replaceable class="parameter">DNSKEY TTL</replaceable></term>

        <listitem>

          <para>

            Sets the value to be used as the DNSKEY TTL for the zone or

            zones being analyzed when determining whether there is a

            possibility of validation failure.  When a key is rolled (that

            is, replaced with a new key), there must be enough time for the

            old DNSKEY RRset to have expired from resolver caches before

            the new key is activated and begins generating signatures.  If

            that condition does not apply, a warning will be generated.

          </para>

          <para>

            The length of the TTL can be set in seconds, or in larger units

            of time by adding a suffix: 'mi' for minutes, 'h' for hours,

            'd' for days, 'w' for weeks, 'mo' for months, 'y' for years.

          </para>

          <para>

            This option is not necessary if <option>-f</option> has

            been used to specify a zone file from which the TTL

            of the DNSKEY RRset can be read, or if a default key TTL was

            set using ith the <option>-L</option> to

            <command>dnssec-keygen</command>.  If either of those is true,

            this option may still be used; it will override the values

            found in the zone file or the key file.

          </para>

          <para>

            If this option is not used and the key TTL cannot be retrieved

            from the zone file or the key file, then a warning is generated

            and a default value of 1 day is used.

          </para>

        </listitem>

      </varlistentry>

      <varlistentry>

        <term>-r <replaceable class="parameter">resign interval</replaceable></term>

        <listitem>

          <para>

            Sets the value to be used as the resign interval for the zone

            or zones being analyzed when determining whether there is a

            possibility of validation failure.  This value defaults to

            22.5 days, which is also the default in

            <command>named</command>.  However, if it has been changed

            by the <option>sig-validity-interval</option> option in

            <filename>named.conf</filename>, then it should also be

            changed here.

          </para>

          <para>

            The length of the interval can be set in seconds, or in larger

            units of time by adding a suffix: 'mi' for minutes, 'h' for hours,

            'd' for days, 'w' for weeks, 'mo' for months, 'y' for years.

          </para>

        </listitem>

      </varlistentry>

      <varlistentry>

        <term>-k</term>

        <listitem>

          <para>

	    Only check KSK coverage; ignore ZSK events. Cannot be

            used with <option>-z</option>.

          </para>

        </listitem>

      </varlistentry>

      <varlistentry>

        <term>-z</term>

        <listitem>

          <para>

	    Only check ZSK coverage; ignore KSK events. Cannot be

            used with <option>-k</option>.

          </para>

        </listitem>

      </varlistentry>

      <varlistentry>

        <term>-c <replaceable class="parameter">compilezone path</replaceable></term>

        <listitem>

          <para>

            Specifies a path to a <command>named-compilezone</command> binary.

            Used for testing.

          </para>

        </listitem>

      </varlistentry>

    </variablelist>

  </refsection>

  <refsection><info><title>SEE ALSO</title></info>

    <para>

      <citerefentry>

        <refentrytitle>dnssec-checkds</refentrytitle><manvolnum>8</manvolnum>

      </citerefentry>,

      <citerefentry>

        <refentrytitle>dnssec-dsfromkey</refentrytitle><manvolnum>8</manvolnum>

      </citerefentry>,

      <citerefentry>

        <refentrytitle>dnssec-keygen</refentrytitle><manvolnum>8</manvolnum>

      </citerefentry>,

      <citerefentry>

        <refentrytitle>dnssec-signzone</refentrytitle><manvolnum>8</manvolnum>

      </citerefentry>

    </para>

  </refsection>

</refentry>