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<refentry xmlns:db="http://docbook.org/ns/docbook" version="5.0" xml:id="man.mdig">
  <info>
    <date>2015-01-05</date>
  </info>
  <refentryinfo>
    <corpname>ISC</corpname>
    <corpauthor>Internet Systems Consortium, Inc.</corpauthor>
  </refentryinfo>
  <refmeta>
    <refentrytitle><application>mdig</application></refentrytitle>
    <manvolnum>1</manvolnum>
    <refmiscinfo>BIND9</refmiscinfo>
  </refmeta>
  <refnamediv>
    <refname><application>mdig</application></refname>
    <refpurpose>DNS pipelined lookup utility</refpurpose>
  </refnamediv>

  <docinfo>
    <copyright>
      <year>2015</year>
      <year>2016</year>
      <year>2017</year>
      <year>2018</year>
      <holder>Internet Systems Consortium, Inc. ("ISC")</holder>
    </copyright>
  </docinfo>

  <refsynopsisdiv>
    <cmdsynopsis sepchar=" ">
      <command>mdig</command>
      <arg choice="req" rep="norepeat">@server</arg>
      <arg choice="opt" rep="norepeat"><option>-f <replaceable class="parameter">filename</replaceable></option></arg>
      <arg choice="opt" rep="norepeat"><option>-h</option></arg>
      <arg choice="opt" rep="norepeat"><option>-v</option></arg>
      <group choice="opt" rep="norepeat">
	<arg choice="opt" rep="norepeat"><option>-4</option></arg>
	<arg choice="opt" rep="norepeat"><option>-6</option></arg>
      </group>
      <arg choice="opt" rep="norepeat"><option>-m</option></arg>
      <arg choice="opt" rep="norepeat"><option>-b <replaceable class="parameter">address</replaceable></option></arg>
      <arg choice="opt" rep="norepeat"><option>-p <replaceable class="parameter">port#</replaceable></option></arg>
      <arg choice="opt" rep="norepeat"><option>-c <replaceable class="parameter">class</replaceable></option></arg>
      <arg choice="opt" rep="norepeat"><option>-t <replaceable class="parameter">type</replaceable></option></arg>
      <arg choice="opt" rep="norepeat"><option>-i</option></arg>
      <arg choice="opt" rep="norepeat"><option>-x <replaceable class="parameter">addr</replaceable></option></arg>
      <arg choice="opt" rep="repeat">plusopt</arg>
    </cmdsynopsis>

    <cmdsynopsis sepchar=" ">
      <command>mdig</command>
      <arg choice="req" rep="norepeat">-h</arg>
    </cmdsynopsis>

    <cmdsynopsis sepchar=" ">
      <command>mdig</command>
      <arg choice="opt" rep="norepeat">@server</arg>
      <arg choice="req" rep="repeat">global-opt</arg>
      <arg choice="req" rep="repeat">
         <arg choice="req" rep="repeat">local-opt</arg>
         <arg choice="req" rep="norepeat">query</arg>
      </arg>
    </cmdsynopsis>
  </refsynopsisdiv>

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

    <para><command>mdig</command>
      is a multiple/pipelined query version of <command>dig</command>:
      instead of waiting for a response after sending each query,
      it begins by sending all queries. Responses are displayed in
      the order in which they are received, not in the order the
      corresponding queries were sent.
    </para>

    <para>
      <command>mdig</command> options are a subset of the
      <command>dig</command> options, and are divided into "anywhere
      options" which can occur anywhere, "global options" which must
      occur before the query name (or they are ignored with a warning),
      and "local options" which apply to the next query on the command
      line.
    </para>

    <para>
      The <arg choice="req" rep="norepeat">@server</arg> option is a mandatory global
      option.  It is the name or IP address of the name server to query.
      (Unlike <command>dig</command>, this value is not retrieved from
      <filename>/etc/resolv.conf</filename>.)  It can be an IPv4 address
      in dotted-decimal notation, an IPv6 address in colon-delimited
      notation, or a hostname.  When the supplied
      <parameter>server</parameter> argument is a hostname,
      <command>mdig</command> resolves that name before querying
      the name server.
    </para>

    <para><command>mdig</command>
      provides a number of query options which affect
      the way in which lookups are made and the results displayed.  Some of
      these set or reset flag bits in the query header, some determine which
      sections of the answer get printed, and others determine the timeout
      and retry strategies.
    </para>

    <para>
      Each query option is identified by a keyword preceded by a plus
      sign (<literal>+</literal>).  Some keywords set or reset an
      option.  These may be preceded by the string <literal>no</literal>
      to negate the meaning of that keyword.  Other keywords assign
      values to options like the timeout interval.  They have the
      form <option>+keyword=value</option>.
    </para>
  </refsection>

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


    <para>
      The <option>-f</option> option makes <command>mdig</command>
      operate in batch mode by reading a list of lookup requests to
      process from the file <parameter>filename</parameter>.  The file
      contains a number of queries, one per line.  Each entry in the
      file should be organized in the same way they would be presented
      as queries to <command>mdig</command> using the command-line interface.
    </para>

    <para>
      The <option>-h</option> causes <command>mdig</command> to
      print the detailed help with the full list of options and exit.
    </para>

    <para>
      The <option>-v</option> causes <command>mdig</command> to
      print the version number and exit.
    </para>
  </refsection>

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


    <para>
      The <option>-4</option> option forces <command>mdig</command> to
      only use IPv4 query transport.
    </para>

    <para>
      The <option>-6</option> option forces <command>mdig</command> to
      only use IPv6 query transport.
    </para>

    <para>
      The <option>-b</option> option sets the source IP address of the
      query to <parameter>address</parameter>.  This must be a valid
      address on one of the host's network interfaces or "0.0.0.0" or
      "::".  An optional port may be specified by appending
      "#&lt;port&gt;"
    </para>

    <para>
      The <option>-m</option> option enables memory usage debugging.
    </para>

    <para>
      The <option>-p</option> option is used when a non-standard port
      number is to be queried.
      <parameter>port#</parameter> is the port number
      that <command>mdig</command> will send its queries instead of
      the standard DNS port number 53.  This option would be used to
      test a name server that has been configured to listen for
      queries on a non-standard port number.
    </para>

    <para>
      The global query options are:
      <variablelist>

        <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>+[no]answer</option></term>
          <listitem>
            <para>
              Display [do not display] the answer section of a
              reply.  The default is to display it.
            </para>
          </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]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]cl</option></term>
          <listitem>
            <para>
              Display [do not display] the CLASS when printing the
              record.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]comments</option></term>
          <listitem>
            <para>
              Toggle the display of comment lines in the output.
              The default is to print comments.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]continue</option></term>
          <listitem>
            <para>
              Continue on errors (e.g. timeouts).
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]crypto</option></term>
          <listitem>
            <para>
              Toggle the display of cryptographic fields in DNSSEC
              records.  The contents of these field are unnecessary
              to debug most DNSSEC validation failures and removing
              them makes it easier to see the common failures.  The
              default is to display the fields.  When omitted they
              are replaced by the string "[omitted]" or in the
              DNSKEY case the key id is displayed as the replacement,
              e.g. "[ key id = value ]".
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+dscp[=value]</option></term> <listitem>
            <para>
              Set the DSCP code point to be used when sending the
              query.  Valid DSCP code points are in the range
              [0..63].  By default no code point is explicitly set.
            </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>mdig</command>
              output.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]question</option></term>
          <listitem>
            <para>
              Print [do not print] the question section of a query
              when an answer is returned.  The default is to print
              the question section as a comment.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]rrcomments</option></term>
          <listitem>
            <para>
              Toggle the display of per-record comments in the
              output (for example, human-readable key information
              about DNSKEY records).  The default is not to print
              record comments unless multiline mode is active.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]short</option></term>
          <listitem>
            <para>
              Provide a terse answer.  The default is to print the
              answer in a verbose form.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+split=W</option></term>
          <listitem>
            <para>
              Split long hex- or base64-formatted fields in resource
              records into chunks of <parameter>W</parameter>
              characters (where <parameter>W</parameter> is rounded
              up to the nearest multiple of 4).
              <parameter>+nosplit</parameter> or
              <parameter>+split=0</parameter> causes fields not to
              be split at all.  The default is 56 characters, or
              44 characters when multiline mode is active.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]tcp</option></term>
          <listitem>
            <para>
              Use [do not use] TCP when querying name servers. The
              default behavior is to use UDP.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]ttlid</option></term>
          <listitem>
            <para>
              Display [do not display] the TTL when printing the
              record.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]ttlunits</option></term>
          <listitem>
            <para>
              Display [do not display] the TTL in friendly human-readable
              time units of "s", "m", "h", "d", and "w", representing
              seconds, minutes, hours, days and weeks.  Implies +ttlid.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]vc</option></term>
          <listitem>
            <para>
              Use [do not use] TCP when querying name servers.  This
              alternate syntax to <parameter>+[no]tcp</parameter>
              is provided for backwards compatibility.  The "vc"
              stands for "virtual circuit".
            </para>
          </listitem>
        </varlistentry>

      </variablelist>

    </para>
  </refsection>

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


    <para>
      The <option>-c</option> option sets the query class to
      <parameter>class</parameter>.  It can be any valid query class
      which is supported in BIND 9.  The default query class is "IN".
    </para>

    <para>
      The <option>-t</option> option sets the query type to
      <parameter>type</parameter>.  It can be any valid query type
      which is supported in BIND 9.  The default query type is "A",
      unless the <option>-x</option> option is supplied to indicate
      a reverse lookup with the "PTR" query type.
    </para>

    <para>
      The <option>-i</option> option sets the reverse domain for
      IPv6 addresses to IP6.INT.
    </para>

    <para>
      Reverse lookups &mdash; mapping addresses to names &mdash; are
      simplified by the <option>-x</option> option.
      <parameter>addr</parameter> is an IPv4
      address in dotted-decimal notation, or a colon-delimited IPv6 address.
      <command>mdig</command> automatically performs a lookup for a
      query name like <literal>11.12.13.10.in-addr.arpa</literal> and
      sets the query type and class to PTR and IN respectively.
      By default, IPv6 addresses are looked up using nibble format
      under the IP6.ARPA domain.  To use the older RFC1886 method
      using the IP6.INT domain specify the <option>-i</option> option.
    </para>

    <para>
      The local query options are:
      <variablelist>

        <varlistentry>
          <term><option>+[no]aaflag</option></term>
          <listitem>
            <para>
              A synonym for <parameter>+[no]aaonly</parameter>.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]aaonly</option></term>
          <listitem>
            <para>
              Sets the "aa" flag in the query.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]adflag</option></term>
          <listitem>
            <para>
              Set [do not set] the AD (authentic data) bit in the
              query.  This requests the server to return whether
              all of the answer and authority sections have all
              been validated as secure according to the security
              policy of the server.  AD=1 indicates that all records
              have been validated as secure and the answer is not
              from a OPT-OUT range.  AD=0 indicate that some part
              of the answer was insecure or not validated.  This
              bit is set by default.
            </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>+[no]cdflag</option></term>
          <listitem>
            <para>
              Set [do not set] the CD (checking disabled) bit in
              the query.  This requests the server to not perform
              DNSSEC validation of responses.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]cookie<optional>=####</optional></option></term>
	  <listitem>
	    <para>
	      Send a COOKIE EDNS option, with optional value.
	      Replaying a COOKIE from a previous response will allow
	      the server to identify a previous client.  The default
	      is <option>+nocookie</option>.
	    </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]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.  EDNS is set to
               0 by default.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]ednsflags[=#]</option></term>
          <listitem>
            <para>
              Set the must-be-zero EDNS flags bits (Z bits) to the
              specified value. Decimal, hex and octal encodings are
              accepted. Setting a named flag (e.g. DO) will silently be
              ignored. By default, no Z bits are set.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]ednsopt[=code[:value]]</option></term>
          <listitem>
            <para>
              Specify EDNS option with code point <option>code</option>
              and optionally payload of <option>value</option> as a
              hexadecimal string.  <option>+noednsopt</option>
              clears the EDNS options to be sent.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]expire</option></term>
          <listitem>
            <para>
              Send an EDNS Expire option.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]nsid</option></term>
          <listitem>
            <para>
              Include an EDNS name server ID request when sending
              a query.
            </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+[no]recurse</option></term>
          <listitem>
            <para>
              Toggle the setting of the RD (recursion desired) bit
              in the query.  This bit is set by default, which means
              <command>mdig</command> normally sends recursive
              queries.
            </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>+[no]subnet=addr[/prefix-length]</option></term>
          <listitem>
	    <para>
	      Send (don't send) an EDNS Client Subnet option with the
              specified IP address or network prefix.
	    </para>
	    <para>
              <command>mdig +subnet=0.0.0.0/0</command>, or simply
              <command>mdig +subnet=0</command> for short, sends an EDNS
              client-subnet option with an empty address and a source
              prefix-length of zero, which signals a resolver that
              the client's address information must
              <emphasis>not</emphasis> be used when resolving
              this query.
	    </para>
          </listitem>
        </varlistentry>

        <varlistentry>
          <term><option>+timeout=T</option></term>
          <listitem>
            <para>
              Sets the timeout for a query to
              <parameter>T</parameter> seconds.  The default
              timeout is 5 seconds for UDP transport and 10 for TCP.
              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>+udptimeout=T</option></term>
          <listitem>
            <para>
              Sets the timeout between UDP query retries.
            </para>
          </listitem>
        </varlistentry>

	<varlistentry>
	  <term><option>+[no]unknownformat</option></term>
	  <listitem>
	    <para>
	      Print all RDATA in unknown RR type presentation format
	      (RFC 3597). The default is to print RDATA for known types
	      in the type's presentation format.
	    </para>
	  </listitem>
	</varlistentry>

        <varlistentry>
          <term><option>+[no]zflag</option></term>
          <listitem>
            <para>
              Set [do not set] the last unassigned DNS header flag in a
              DNS query.  This flag is off by default.
            </para>
          </listitem>
        </varlistentry>

      </variablelist>

    </para>
  </refsection>

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

    <para><citerefentry>
        <refentrytitle>dig</refentrytitle><manvolnum>1</manvolnum>
      </citerefentry>,
      <citetitle>RFC1035</citetitle>.
    </para>
  </refsection>
</refentry>
