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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 07:24:22 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 07:24:22 +0000
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+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0. If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+.. highlight: console
+
+.. _man_mdig:
+
+mdig - DNS pipelined lookup utility
+-----------------------------------
+
+Synopsis
+~~~~~~~~
+
+:program:`mdig` {@server} [**-f** filename] [**-h**] [**-v**] [ [**-4**] | [**-6**] ] [**-m**] [**-b** address] [**-p** port#] [**-c** class] [**-t** type] [**-i**] [**-x** addr] [plusopt...]
+
+:program:`mdig` {**-h**}
+
+:program:`mdig` [@server] {global-opt...} { {local-opt...} {query} ...}
+
+Description
+~~~~~~~~~~~
+
+``mdig`` is a multiple/pipelined query version of ``dig``: 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.
+
+``mdig`` options are a subset of the ``dig`` 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.
+
+The ``@server`` option is a mandatory global option. It is the name or IP
+address of the name server to query. (Unlike ``dig``, this value is not
+retrieved from ``/etc/resolv.conf``.) It can be an IPv4 address in
+dotted-decimal notation, an IPv6 address in colon-delimited notation, or
+a hostname. When the supplied ``server`` argument is a hostname,
+``mdig`` resolves that name before querying the name server.
+
+``mdig`` 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.
+
+Each query option is identified by a keyword preceded by a plus sign
+(``+``). Some keywords set or reset an option. These may be preceded by
+the string ``no`` to negate the meaning of that keyword. Other keywords
+assign values to options like the timeout interval. They have the form
+``+keyword=value``.
+
+Anywhere Options
+~~~~~~~~~~~~~~~~
+
+``-f``
+ This option makes ``mdig`` operate in batch mode by reading a list
+ of lookup requests to process from the file ``filename``. 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 ``mdig`` using the command-line interface.
+
+``-h``
+ This option causes ``mdig`` to print detailed help information, with the full list
+ of options, and exit.
+
+``-v``
+ This option causes ``mdig`` to print the version number and exit.
+
+Global Options
+~~~~~~~~~~~~~~
+
+``-4``
+ This option forces ``mdig`` to only use IPv4 query transport.
+
+``-6``
+ This option forces ``mdig`` to only use IPv6 query transport.
+
+``-b address``
+ This option sets the source IP address of the query to
+ ``address``. 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 "#<port>"
+
+``-m``
+ This option enables memory usage debugging.
+
+``-p port#``
+ This option is used when a non-standard port number is to be
+ queried. ``port#`` is the port number that ``mdig`` sends its
+ queries to, instead of the standard DNS port number 53. This option is
+ used to test a name server that has been configured to listen for
+ queries on a non-standard port number.
+
+The global query options are:
+
+``+[no]additional``
+ This option displays [or does not display] the additional section of a reply. The
+ default is to display it.
+
+``+[no]all``
+ This option sets or clears all display flags.
+
+``+[no]answer``
+ This option displays [or does not display] the answer section of a reply. The default
+ is to display it.
+
+``+[no]authority``
+ This option displays [or does not display] the authority section of a reply. The
+ default is to display it.
+
+``+[no]besteffort``
+ This option attempts to display [or does not display] the contents of messages which are malformed. The
+ default is to not display malformed answers.
+
+``+burst``
+ This option delays queries until the start of the next second.
+
+``+[no]cl``
+ This option displays [or does not display] the CLASS when printing the record.
+
+``+[no]comments``
+ This option toggles the display of comment lines in the output. The default is to
+ print comments.
+
+``+[no]continue``
+ This option toggles continuation on errors (e.g. timeouts).
+
+``+[no]crypto``
+ This option toggles the display of cryptographic fields in DNSSEC records. The
+ contents of these fields 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]"; in the DNSKEY case, the
+ key ID is displayed as the replacement, e.g., ``[ key id = value ]``.
+
+``+dscp[=value]``
+ This option sets 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.
+
+``+[no]multiline``
+ This option toggles printing of 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 ``mdig`` output.
+
+``+[no]question``
+ This option prints [or does not print] the question section of a query when an answer
+ is returned. The default is to print the question section as a
+ comment.
+
+``+[no]rrcomments``
+ This option toggles 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.
+
+``+[no]short``
+ This option provides [or does not provide] a terse answer. The default is to print the answer in a
+ verbose form.
+
+``+split=W``
+ This option splits long hex- or base64-formatted fields in resource records into
+ chunks of ``W`` characters (where ``W`` is rounded up to the nearest
+ multiple of 4). ``+nosplit`` or ``+split=0`` causes fields not to be
+ split. The default is 56 characters, or 44 characters when
+ multiline mode is active.
+
+``+[no]tcp``
+ This option uses [or does not use] TCP when querying name servers. The default behavior
+ is to use UDP.
+
+``+[no]ttlid``
+ This option displays [or does not display] the TTL when printing the record.
+
+``+[no]ttlunits``
+ This option displays [or does not display] the TTL in friendly human-readable time
+ units of "s", "m", "h", "d", and "w", representing seconds, minutes,
+ hours, days, and weeks. This implies +ttlid.
+
+``+[no]vc``
+ This option uses [or does not use] TCP when querying name servers. This alternate
+ syntax to ``+[no]tcp`` is provided for backwards compatibility. The
+ ``vc`` stands for "virtual circuit".
+
+Local Options
+~~~~~~~~~~~~~
+
+``-c class``
+ This option sets the query class to ``class``. It can be any valid
+ query class which is supported in BIND 9. The default query class is
+ "IN".
+
+``-t type``
+ This option sets the query type to ``type``. It can be any valid
+ query type which is supported in BIND 9. The default query type is "A",
+ unless the ``-x`` option is supplied to indicate a reverse lookup with
+ the "PTR" query type.
+
+``-x addr``
+ Reverse lookups - mapping addresses to names - are simplified by
+ this option. ``addr`` is an IPv4 address in dotted-decimal
+ notation, or a colon-delimited IPv6 address. ``mdig`` automatically
+ performs a lookup for a query name like ``11.12.13.10.in-addr.arpa`` 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.
+
+The local query options are:
+
+``+[no]aaflag``
+ This is a synonym for ``+[no]aaonly``.
+
+``+[no]aaonly``
+ This sets the ``aa`` flag in the query.
+
+``+[no]adflag``
+ This sets [or does 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
+ indicates that some part of the answer was insecure or not validated.
+ This bit is set by default.
+
+``+bufsize=B``
+ This sets the UDP message buffer size advertised using EDNS0 to ``B``
+ 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 cause a EDNS query to be
+ sent.
+
+``+[no]cdflag``
+ This sets [or does not set] the CD (checking disabled) bit in the query. This
+ requests the server to not perform DNSSEC validation of responses.
+
+``+[no]cookie=####``
+ This sends [or does not send] a COOKIE EDNS option, with an optional value. Replaying a COOKIE
+ from a previous response allows the server to identify a previous
+ client. The default is ``+nocookie``.
+
+``+[no]dnssec``
+ This requests that DNSSEC records be sent by setting the DNSSEC OK (DO) bit in
+ the OPT record in the additional section of the query.
+
+``+[no]edns[=#]``
+ This specifies [or does not specify] the EDNS version to query with. Valid values are 0 to 255.
+ Setting the EDNS version causes an EDNS query to be sent.
+ ``+noedns`` clears the remembered EDNS version. EDNS is set to 0 by
+ default.
+
+``+[no]ednsflags[=#]``
+ This sets the must-be-zero EDNS flag bits (Z bits) to the specified value.
+ Decimal, hex, and octal encodings are accepted. Setting a named flag
+ (e.g. DO) is silently ignored. By default, no Z bits are set.
+
+``+[no]ednsopt[=code[:value]]``
+ This specifies [or does not specify] an EDNS option with code point ``code`` and an optional payload
+ of ``value`` as a hexadecimal string. ``+noednsopt`` clears the EDNS
+ options to be sent.
+
+``+[no]expire``
+ This toggles sending of an EDNS Expire option.
+
+``+[no]nsid``
+ This toggles inclusion of an EDNS name server ID request when sending a query.
+
+``+[no]recurse``
+ This toggles the setting of the RD (recursion desired) bit in the query.
+ This bit is set by default, which means ``mdig`` normally sends
+ recursive queries.
+
+``+retry=T``
+ This sets the number of times to retry UDP queries to server to ``T``
+ instead of the default, 2. Unlike ``+tries``, this does not include
+ the initial query.
+
+``+[no]subnet=addr[/prefix-length]``
+ This sends [or does not send] an EDNS Client Subnet option with the specified IP
+ address or network prefix.
+
+``mdig +subnet=0.0.0.0/0``, or simply ``mdig +subnet=0``
+ This 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 *not* be used when resolving this query.
+
+``+timeout=T``
+ This sets the timeout for a query to ``T`` seconds. The default timeout is
+ 5 seconds for UDP transport and 10 for TCP. An attempt to set ``T``
+ to less than 1 results in a query timeout of 1 second being
+ applied.
+
+``+tries=T``
+ This sets the number of times to try UDP queries to server to ``T``
+ instead of the default, 3. If ``T`` is less than or equal to zero,
+ the number of tries is silently rounded up to 1.
+
+``+udptimeout=T``
+ This sets the timeout between UDP query retries to ``T``.
+
+``+[no]unknownformat``
+ This prints [or does not print] all RDATA in unknown RR-type presentation format (see :rfc:`3597`).
+ The default is to print RDATA for known types in the type's
+ presentation format.
+
+``+[no]yaml``
+ This toggles printing of the responses in a detailed YAML format.
+
+``+[no]zflag``
+ This sets [or does not set] the last unassigned DNS header flag in a DNS query.
+ This flag is off by default.
+
+See Also
+~~~~~~~~
+
+:manpage:`dig(1)`, :rfc:`1035`.