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.\" ========================================================================
.\"
.IX Title "Net::DNS::RR 3pm"
.TH Net::DNS::RR 3pm 2024-02-17 "perl v5.38.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH NAME
Net::DNS::RR \- DNS resource record base class
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 1
\&    use Net::DNS;
\&
\&    $rr = Net::DNS::RR\->new(\*(Aqexample.com IN AAAA 2001:DB8::1\*(Aq);
\&
\&    $rr = Net::DNS::RR\->new(
\&            owner   => \*(Aqexample.com\*(Aq,
\&            type    => \*(AqAAAA\*(Aq,
\&            address => \*(Aq2001:DB8::1\*(Aq
\&            );
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
Net::DNS::RR is the base class for DNS Resource Record (RR) objects.
See also the manual pages for each specific RR type.
.SH METHODS
.IX Header "METHODS"
\&\fBWARNING!!!\fR  Do not assume the RR objects you receive from a query
are of a particular type.  You must always check the object type
before calling any of its methods.  If you call an unknown method,
you will get an error message and execution will be terminated.
.SS "new (from string)"
.IX Subsection "new (from string)"
.Vb 4
\&    $aaaa  = Net::DNS::RR\->new(\*(Aqhost.example.com. 86400 AAAA 2001:DB8::1\*(Aq);
\&    $mx    = Net::DNS::RR\->new(\*(Aqexample.com. 7200 MX 10 mailhost.example.com.\*(Aq);
\&    $cname = Net::DNS::RR\->new(\*(Aqwww.example.com 300 IN CNAME host.example.com\*(Aq);
\&    $txt   = Net::DNS::RR\->new(\*(Aqtxt.example.com 3600 HS TXT "text data"\*(Aq);
.Ve
.PP
Returns an object of the appropriate RR type, or a Net::DNS::RR object
if the type is not implemented. The attribute values are extracted from the
string passed by the user. The syntax of the argument string follows the
RFC1035 specification for zone files, and is compatible with the result
returned by the string method.
.PP
The owner and RR type are required; all other information is optional.
Omitting the optional fields is useful for creating the empty RDATA
sections required for certain dynamic update operations.
See the Net::DNS::Update manual page for additional examples.
.PP
All names are interpreted as fully qualified domain names.
The trailing dot (.) is optional.
.SS "new (from hash)"
.IX Subsection "new (from hash)"
.Vb 1
\&    $rr = Net::DNS::RR\->new(%hash);
\&
\&    $rr = Net::DNS::RR\->new(
\&            owner   => \*(Aqhost.example.com\*(Aq,
\&            ttl     => 86400,
\&            class   => \*(AqIN\*(Aq,
\&            type    => \*(AqAAAA\*(Aq,
\&            address => \*(Aq2001:DB8::1\*(Aq
\&            );
\& 
\&    $rr = Net::DNS::RR\->new(
\&            owner   => \*(Aqtxt.example.com\*(Aq,
\&            type    => \*(AqTXT\*(Aq,
\&            txtdata => [ \*(Aqone\*(Aq, \*(Aqtwo\*(Aq ]
\&            );
.Ve
.PP
Returns an object of the appropriate RR type, or a Net::DNS::RR object
if the type is not implemented. Consult the relevant manual pages for the
usage of type specific attributes.
.PP
The owner and RR type are required; all other information is optional.
Omitting optional attributes is useful for creating the empty RDATA
sections required for certain dynamic update operations.
.SS decode
.IX Subsection "decode"
.Vb 1
\&    ( $rr, $next ) = Net::DNS::RR\->decode( \e$data, $offset, @opaque );
.Ve
.PP
Decodes a DNS resource record at the specified location within a
DNS packet.
.PP
The argument list consists of a reference to the buffer containing
the packet data and offset indicating where resource record begins.
Any remaining arguments are passed as opaque data to subordinate
decoders and do not form part of the published interface.
.PP
Returns a \f(CW\*(C`Net::DNS::RR\*(C'\fR object and the offset of the next record
in the packet.
.PP
An exception is raised if the data buffer contains insufficient or
corrupt data.
.SS encode
.IX Subsection "encode"
.Vb 1
\&    $data = $rr\->encode( $offset, @opaque );
.Ve
.PP
Returns the \f(CW\*(C`Net::DNS::RR\*(C'\fR in binary format suitable for inclusion
in a DNS packet buffer.
.PP
The offset indicates the intended location within the packet data
where the \f(CW\*(C`Net::DNS::RR\*(C'\fR is to be stored.
.PP
Any remaining arguments are opaque data which are passed intact to
subordinate encoders.
.SS canonical
.IX Subsection "canonical"
.Vb 1
\&    $data = $rr\->canonical;
.Ve
.PP
Returns the \f(CW\*(C`Net::DNS::RR\*(C'\fR in canonical binary format suitable for
DNSSEC signature validation.
.PP
The absence of the associative array argument signals to subordinate
encoders that the canonical uncompressed lower case form of embedded
domain names is to be used.
.SS print
.IX Subsection "print"
.Vb 1
\&    $rr\->print;
.Ve
.PP
Prints the resource record to the currently selected output filehandle.
Calls the string method to get the formatted RR representation.
.SS string
.IX Subsection "string"
.Vb 1
\&    print $rr\->string, "\en";
.Ve
.PP
Returns a string representation of the RR using the master file format
mandated by RFC1035.
All domain names are fully qualified with trailing dot.
This differs from RR attribute methods, which omit the trailing dot.
.SS plain
.IX Subsection "plain"
.Vb 1
\&    $plain = $rr\->plain;
.Ve
.PP
Returns a simplified single-line representation of the RR.
This facilitates interaction with programs like nsupdate
which have rudimentary parsers.
.SS token
.IX Subsection "token"
.Vb 1
\&    @token = $rr\->token;
.Ve
.PP
Returns a token list representation of the RR zone file string.
.SS generic
.IX Subsection "generic"
.Vb 1
\&    $generic = $rr\->generic;
.Ve
.PP
Returns the generic RR representation defined in RFC3597. This facilitates
creation of zone files containing RRs unrecognised by outdated nameservers
and provisioning software.
.SS "owner name"
.IX Subsection "owner name"
.Vb 1
\&    $name = $rr\->owner;
.Ve
.PP
Returns the owner name of the record.
.SS type
.IX Subsection "type"
.Vb 1
\&    $type = $rr\->type;
.Ve
.PP
Returns the record type.
.SS class
.IX Subsection "class"
.Vb 1
\&    $class = $rr\->class;
.Ve
.PP
Resource record class.
.SS ttl
.IX Subsection "ttl"
.Vb 2
\&    $ttl = $rr\->ttl;
\&    $ttl = $rr\->ttl(3600);
.Ve
.PP
Resource record time to live in seconds.
.SS rdata
.IX Subsection "rdata"
.Vb 1
\&    $rr = Net::DNS::RR\->new( type => NULL, rdata => \*(Aqarbitrary\*(Aq );
.Ve
.PP
Resource record data section when viewed as opaque octets.
.SS rdstring
.IX Subsection "rdstring"
.Vb 1
\&    $rdstring = $rr\->rdstring;
.Ve
.PP
Returns a string representation of the RR-specific data.
.SS rdlength
.IX Subsection "rdlength"
.Vb 1
\&    $rdlength = $rr\->rdlength;
.Ve
.PP
Returns the uncompressed length of the encoded RR-specific data.
.SH "Sorting of RR arrays"
.IX Header "Sorting of RR arrays"
Sorting of RR arrays is done by \fBNet::DNS::rrsort()\fR, see documentation
for Net::DNS. This package provides class methods to set the
comparator function used for a particular RR based on its attributes.
.SS set_rrsort_func
.IX Subsection "set_rrsort_func"
.Vb 3
\&    my $function = sub {        ## numerically ascending order
\&        $Net::DNS::a\->{\*(Aqpreference\*(Aq} <=> $Net::DNS::b\->{\*(Aqpreference\*(Aq};
\&    };
\&
\&    Net::DNS::RR::MX\->set_rrsort_func( \*(Aqpreference\*(Aq, $function );
\&
\&    Net::DNS::RR::MX\->set_rrsort_func( \*(Aqdefault_sort\*(Aq, $function );
.Ve
.PP
\&\fBset_rrsort_func()\fR must be called as a class method. The first argument is
the attribute name on which the sorting is to take place. If you specify
"default_sort" then that is the sort algorithm that will be used when
\&\fBget_rrsort_func()\fR is called without an RR attribute as argument.
.PP
The second argument is a reference to a comparator function that uses the
global variables \f(CW$a\fR and \f(CW$b\fR in the Net::DNS package. During sorting, the
variables \f(CW$a\fR and \f(CW$b\fR will contain references to objects of the class whose
\&\fBset_rrsort_func()\fR was called. The above sorting function will only be
applied to Net::DNS::RR::MX objects.
.PP
The above example is the sorting function implemented in MX.
.SS get_rrsort_func
.IX Subsection "get_rrsort_func"
.Vb 2
\&    $function = Net::DNS::RR::MX\->get_rrsort_func(\*(Aqpreference\*(Aq);
\&    $function = Net::DNS::RR::MX\->get_rrsort_func();
.Ve
.PP
\&\fBget_rrsort_func()\fR returns a reference to the comparator function.
.SH COPYRIGHT
.IX Header "COPYRIGHT"
Copyright (c)1997\-2001 Michael Fuhr.
.PP
Portions Copyright (c)2002,2003 Chris Reinhardt.
.PP
Portions Copyright (c)2005\-2007 Olaf Kolkman.
.PP
Portions Copyright (c)2007,2012 Dick Franks.
.PP
All rights reserved.
.SH LICENSE
.IX Header "LICENSE"
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted, provided
that the original copyright notices appear in all copies and that both
copyright notice and this permission notice appear in supporting
documentation, and that the name of the author not be used in advertising
or publicity pertaining to distribution of the software without specific
prior written permission.
.PP
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
perl Net::DNS
Net::DNS::Question Net::DNS::Packet Net::DNS::Update
RFC1035(4.1.3) <https://tools.ietf.org/html/rfc1035>
RFC3597 <https://tools.ietf.org/html/rfc3597>