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.\" ========================================================================
.\"
.IX Title "Net::DNS::RR::OPT 3pm"
.TH Net::DNS::RR::OPT 3pm "2014-10-29" "perl v5.20.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.nh
.SH "NAME"
Net::DNS::RR::OPT \- DNS OPT resource record
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 7
\&    use Net::DNS;
\&    $opt = new Net::DNS::RR(
\&        type    => "OPT",  
\&        flags   => 0x8000,      # extended flags
\&        rcode   => 0,           # extended RCODE
\&        size    => 1280,        # UDP payload size
\&        );
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\s-1EDNS OPT\s0 pseudo resource record.
.PP
The \s-1OPT\s0 record supports \s-1EDNS\s0 protocol extensions and is not intended to be
created, accessed or modified directly by user applications.
.PP
All access to \s-1EDNS\s0 features is performed indirectly by operations on the
packet header. The underlying mechanism is entirely hidden from the user.
.SH "METHODS"
.IX Header "METHODS"
The available methods are those inherited from the base class augmented
by the type-specific methods defined in this package.
.PP
Use of undocumented package features or direct access to internal data
structures is discouraged and could result in program termination or
other unpredictable behaviour.
.SS "version"
.IX Subsection "version"
.Vb 2
\&    $version = $rr\->version;
\&    $rr\->version( $version );
.Ve
.PP
The version of \s-1EDNS\s0 used by this \s-1OPT\s0 record.
.SS "size"
.IX Subsection "size"
.Vb 2
\&        $size = $packet\->edns\->size;
\&        $more = $packet\->edns\->size(1280);
.Ve
.PP
\&\fIsize()\fR advertises the maximum size (octets) of \s-1UDP\s0 packet that can be
reassembled in the network stack of the originating host.
.SS "rcode"
.IX Subsection "rcode"
.Vb 2
\&        $extended_rcode   = $packet\->header\->rcode;
\&        $incomplete_rcode = $packet\->edns\->rcode;
.Ve
.PP
The 12 bit extended \s-1RCODE.\s0 The most significant 8 bits reside in the \s-1OPT\s0
record. The least significant 4 bits can only be obtained from the packet
header.
.SS "flags"
.IX Subsection "flags"
.Vb 1
\&        $edns_flags = $packet\->edns\->flags;
\&
\&        $do = $packet\->header\->do;
\&        $packet\->header\->do(1);
.Ve
.PP
16 bit field containing \s-1EDNS\s0 extended header flags.
.SS "Options"
.IX Subsection "Options"
.Vb 1
\&        @option = $packet\->edns\->options;
\&
\&        $octets = $packet\->edns\->option($option_code);
\&
\&        $packet\->edns\->option( NSID => \*(Aqvalue\*(Aq );
\&        $packet\->edns\->option( 3    => \*(Aqvalue\*(Aq );
.Ve
.PP
When called in a list context, \fIoptions()\fR returns a list of option codes
found in the \s-1OPT\s0 record.
.PP
When called with a single argument, \fIoption()\fR returns the octet string
corresponding to the specified option. The function value is undefined
if the specified option is absent.
.PP
Options can be changed by providing an argument list containing one or
more (name => value) pairs to be added or modified. The effect of such
changes is cumulative. An option is deleted if the value is undefined.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright (c)2001,2002	\s-1RIPE NCC. \s0 Author Olaf M. Kolkman.
.PP
All Rights Reserved
.PP
Permission to use, copy, modify, and distribute this software and its
documentation for any purpose and without fee is hereby granted,
provided that the above copyright notice appear in all copies and that
both that 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
\&\s-1THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS\s0; \s-1IN NO
EVENT SHALL AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF
THIS SOFTWARE.\s0
.PP
Portions Copyright (c)2012 Dick Franks.
.PP
Package template (c)2009,2012 O.M.Kolkman and R.W.Franks.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
perl, Net::DNS, Net::DNS::RR, \s-1RFC6891, RFC3225\s0