dig.docbook

非常好的dns解析软件

          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]authority</option></term>
          <listitem>
            <para>
              Display [do not display] the authority section of a reply.  The
              default is to display it.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]additional</option></term>
          <listitem>
            <para>
              Display [do not display] the additional section of a reply.
              The default is to display it.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]all</option></term>
          <listitem>
            <para>
              Set or clear all display flags.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+time=T</option></term>
          <listitem>
            <para>

              Sets the timeout for a query to
              <parameter>T</parameter> seconds.  The default time
              out is 5 seconds.
              An attempt to set <parameter>T</parameter> to less
              than 1 will result
              in a query timeout of 1 second being applied.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+tries=T</option></term>
          <listitem>
            <para>
              Sets the number of times to try UDP queries to server to
              <parameter>T</parameter> instead of the default, 3.
              If
              <parameter>T</parameter> is less than or equal to
              zero, the number of
              tries is silently rounded up to 1.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+retry=T</option></term>
          <listitem>
            <para>
              Sets the number of times to retry UDP queries to server to
              <parameter>T</parameter> instead of the default, 2.
              Unlike
              <parameter>+tries</parameter>, this does not include
              the initial
              query.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+ndots=D</option></term>
          <listitem>
            <para>
              Set the number of dots that have to appear in
              <parameter>name</parameter> to <parameter>D</parameter> for it to be
              considered absolute.  The default value is that defined using
              the
              ndots statement in <filename>/etc/resolv.conf</filename>, or 1 if no
              ndots statement is present.  Names with fewer dots are
              interpreted as
              relative names and will be searched for in the domains listed in
              the
              <option>search</option> or <option>domain</option> directive in
              <filename>/etc/resolv.conf</filename>.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+bufsize=B</option></term>
          <listitem>
            <para>
              Set the UDP message buffer size advertised using EDNS0 to
              <parameter>B</parameter> bytes.  The maximum and minimum sizes
	      of this buffer are 65535 and 0 respectively.  Values outside
	      this range are rounded up or down appropriately.  
	      Values other than zero will cause a EDNS query to be sent.
            </para>
          </listitem>
        </varlistentry>

	<varlistentry>
	  <term><option>+edns=#</option></term>
	  <listitem>
	    <para>
	       Specify the EDNS version to query with.  Valid values
	       are 0 to 255.  Setting the EDNS version will cause a
	       EDNS query to be sent.  <option>+noedns</option> clears the
	       remembered EDNS version.
	    </para>
	  </listitem>
	</varlistentry>

        <varlistentry>
          <term><option>+[no]multiline</option></term>
          <listitem>
            <para>
              Print records like the SOA records in a verbose multi-line
              format with human-readable comments.  The default is to print
              each record on a single line, to facilitate machine parsing
              of the <command>dig</command> output.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]fail</option></term>
          <listitem>
            <para>
              Do not try the next server if you receive a SERVFAIL.  The
              default is
              to not try the next server which is the reverse of normal stub
              resolver
              behaviour.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]besteffort</option></term>
          <listitem>
            <para>
              Attempt to display the contents of messages which are malformed.
              The default is to not display malformed answers.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]dnssec</option></term>
          <listitem>
            <para>
              Requests DNSSEC records be sent by setting the DNSSEC OK bit
              (DO)
              in the OPT record in the additional section of the query.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]sigchase</option></term>
          <listitem>
            <para>
              Chase DNSSEC signature chains.  Requires dig be compiled with
              -DDIG_SIGCHASE.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+trusted-key=####</option></term>
          <listitem>
            <para>
              Specifies a file containing trusted keys to be used with
	      <option>+sigchase</option>.  Each DNSKEY record must be
	      on its own line.
            </para>
	    <para>
	      If not specified <command>dig</command> will look for
	      <filename>/etc/trusted-key.key</filename> then
	      <filename>trusted-key.key</filename> in the current directory.
	    </para>
	    <para>
              Requires dig be compiled with -DDIG_SIGCHASE.
	    </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]topdown</option></term>
          <listitem>
            <para>
              When chasing DNSSEC signature chains perform a top down
              validation.
              Requires dig be compiled with -DDIG_SIGCHASE.
            </para>
          </listitem>
        </varlistentry>



      </variablelist>

    </para>
  </refsect1>

  <refsect1>
    <title>MULTIPLE QUERIES</title>

    <para>
      The BIND 9 implementation of <command>dig </command>
      supports
      specifying multiple queries on the command line (in addition to
      supporting the <option>-f</option> batch file option).  Each of those
      queries can be supplied with its own set of flags, options and query
      options.
    </para>

    <para>
      In this case, each <parameter>query</parameter> argument
      represent an
      individual query in the command-line syntax described above.  Each
      consists of any of the standard options and flags, the name to be
      looked up, an optional query type and class and any query options that
      should be applied to that query.
    </para>

    <para>
      A global set of query options, which should be applied to all queries,
      can also be supplied.  These global query options must precede the
      first tuple of name, class, type, options, flags, and query options
      supplied on the command line.  Any global query options (except
      the <option>+[no]cmd</option> option) can be
      overridden by a query-specific set of query options.  For example:
      <programlisting>
dig +qr www.isc.org any -x 127.0.0.1 isc.org ns +noqr
</programlisting>
      shows how <command>dig</command> could be used from the
      command line
      to make three lookups: an ANY query for <literal>www.isc.org</literal>, a
      reverse lookup of 127.0.0.1 and a query for the NS records of
      <literal>isc.org</literal>.

      A global query option of <parameter>+qr</parameter> is
      applied, so
      that <command>dig</command> shows the initial query it made
      for each
      lookup.  The final query has a local query option of
      <parameter>+noqr</parameter> which means that <command>dig</command>
      will not print the initial query when it looks up the NS records for
      <literal>isc.org</literal>.
    </para>

  </refsect1>

  <refsect1>
    <title>IDN SUPPORT</title>
    <para>
      If <command>dig</command> has been built with IDN (internationalized
      domain name) support, it can accept and display non-ASCII domain names.
      <command>dig</command> appropriately converts character encoding of
      domain name before sending a request to DNS server or displaying a
      reply from the server.
      If you'd like to turn off the IDN support for some reason, defines
      the <envar>IDN_DISABLE</envar> environment variable.
      The IDN support is disabled if the variable is set when 
      <command>dig</command> runs.
    </para>
  </refsect1>

  <refsect1>
    <title>FILES</title>
    <para><filename>/etc/resolv.conf</filename>
    </para>
    <para><filename>${HOME}/.digrc</filename>
    </para>
  </refsect1>

  <refsect1>
    <title>SEE ALSO</title>
    <para><citerefentry>
        <refentrytitle>host</refentrytitle><manvolnum>1</manvolnum>
      </citerefentry>,
      <citerefentry>
        <refentrytitle>named</refentrytitle><manvolnum>8</manvolnum>
      </citerefentry>,
      <citerefentry>
        <refentrytitle>dnssec-keygen</refentrytitle><manvolnum>8</manvolnum>
      </citerefentry>,
      <citetitle>RFC1035</citetitle>.
    </para>
  </refsect1>

  <refsect1>
    <title>BUGS</title>
    <para>
      There are probably too many query options.
    </para>
  </refsect1>
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