Net::DNS::Packet(3pm) - phpMan

Net::DNS::Packet(3)   User Contributed Perl Documentation  Net::DNS::Packet(3)

NAME
       Net::DNS::Packet - DNS protocol packet
SYNOPSIS
           use Net::DNS::Packet;
           $query = new Net::DNS::Packet('example.com', 'MX', 'IN');
           $reply = $resolver->send($query);
DESCRIPTION
       A "Net::DNS::Packet" object represents a DNS protocol packet.
METHODS
   new
           $packet = new Net::DNS::Packet('example.com');
           $packet = new Net::DNS::Packet('example.com', 'MX', 'IN');
           $packet = new Net::DNS::Packet();
       If passed a domain, type, and class, "new" creates a packet object
       appropriate for making a DNS query for the requested information.  The
       type and class can be omitted; they default to A and IN.
       If called with an empty argument list, "new" creates an empty packet.
           $packet = new Net::DNS::Packet(\$data);
           $packet = new Net::DNS::Packet(\$data, 1);          # set debugging
       If passed a reference to a scalar containing DNS packet data, a new
       packet object is created by decoding the data.  The optional second
       boolean argument is used to enable debugging output.
       Returns undef if unable to create a packet object.
       Decoding errors, including data corruption and truncation, are
       collected in the $@ ($EVAL_ERROR) variable.
           ($packet, $length) = new Net::DNS::Packet(\$data);
       If called in array context, returns a packet object and the number of
       octets successfully decoded.
       Note that the number of RRs in each section of the packet may differ
       from the corresponding header value if the data has been truncated or
       corrupted.
   data
           $data = $packet->data;
           $data = $packet->data($limit);
       Returns the packet data in binary format, suitable for sending to a
       nameserver.
   header
           $header = $packet->header;
       Constructor method which returns a reference to the unique
       "Net::DNS::Header" object which represents the header section of the
       packet.
   EDNS extended header
           $edns    = $packet->edns;
           $version = $edns->version;
           $size    = $edns->size;
       Auxilliary function edns() provides access to EDNS extensions.
   reply
           $reply = $query->reply( $UDPmax );
       Constructor method which returns a new reply packet.
       The optional UDPsize argument is the maximum UDP packet size which can
       be reassembled by the local network stack, and is advertised in
       response to an EDNS query.
   question, zone
           @question = $packet->question;
       Returns a list of "Net::DNS::Question" objects representing the
       question section of the packet.
       In dynamic update packets, this section is known as "zone" and
       specifies the zone to be updated.
   answer, pre, prerequisite
           @answer = $packet->answer;
       Returns a list of "Net::DNS::RR" objects representing the answer
       section of the packet.
       In dynamic update packets, this section is known as "pre" or
       "prerequisite" and specifies the RRs or RRsets which must or must not
       preexist.
   authority, update
           @authority = $packet->authority;
       Returns a list of "Net::DNS::RR" objects representing the authority
       section of the packet.
       In dynamic update packets, this section is known as "update" and
       specifies the RRs or RRsets to be added or deleted.
   additional
           @additional = $packet->additional;
       Returns a list of "Net::DNS::RR" objects representing the additional
       section of the packet.
   print
           $packet->print;
       Prints the packet data on the standard output in an ASCII format
       similar to that used in DNS zone files.
   string
           print $packet->string;
       Returns a string representation of the packet.
   answerfrom
           print "packet received from ", $packet->answerfrom, "\n";
       Returns the IP address from which we received this packet.  User-
       created packets will return undef for this method.
   answersize
           print "packet size: ", $packet->answersize, " bytes\n";
       Returns the size of the packet in bytes as it was received from a
       nameserver.  User-created packets will return undef for this method
       (use "length $packet->data" instead).
   push
           $ancount = $packet->push(prereq => $rr);
           $nscount = $packet->push(update => $rr);
           $arcount = $packet->push(additional => $rr);
           $nscount = $packet->push(update => $rr1, $rr2, $rr3);
           $nscount = $packet->push(update => @rr);
       Adds RRs to the specified section of the packet.
       Returns the number of resource records in the specified section.
   unique_push
           $ancount = $packet->unique_push(prereq => $rr);
           $nscount = $packet->unique_push(update => $rr);
           $arcount = $packet->unique_push(additional => $rr);
           $nscount = $packet->unique_push(update => $rr1, $rr2, $rr3);
           $nscount = $packet->unique_push(update => @rr);
       Adds RRs to the specified section of the packet provided that the RRs
       do not already exist in the packet.
       Returns the number of resource records in the specified section.
   pop
           my $rr = $packet->pop("pre");
           my $rr = $packet->pop("update");
           my $rr = $packet->pop("additional");
           my $rr = $packet->pop("question");
       Removes RRs from the specified section of the packet.
   dn_comp
           $compname = $packet->dn_comp("foo.example.com", $offset);
       Returns a domain name compressed for a particular packet object, to be
       stored beginning at the given offset within the packet data.  The name
       will be added to a running list of compressed domain names for future
       use.
   dn_expand
           use Net::DNS::Packet qw(dn_expand);
           ($name, $nextoffset) = dn_expand(\$data, $offset);
           ($name, $nextoffset) = Net::DNS::Packet::dn_expand(\$data, $offset);
       Expands the domain name stored at a particular location in a DNS
       packet.  The first argument is a reference to a scalar containing the
       packet data.  The second argument is the offset within the packet where
       the (possibly compressed) domain name is stored.
       Returns the domain name and the offset of the next location in the
       packet.
       Returns undef if the domain name could not be expanded.
   sign_tsig
           $key_name = "tsig-key";
           $key      = "awwLOtRfpGE+rRKF2+DEiw==";
           $update = Net::DNS::Update->new("example.com");
           $update->push("update", rr_add("foo.example.com A 10.1.2.3"));
           $update->sign_tsig($key_name, $key);
           $response = $res->send($update);
       Attaches a TSIG resource record object containing a key, which will be
       used to sign a packet with a TSIG resource record (see RFC 2845).  Uses
       the following defaults:
           algorithm   = HMAC-MD5.SIG-ALG.REG.INT
           time_signed = current time
           fudge       = 300 seconds
       If you wish to customize the TSIG record, you'll have to create it
       yourself and call the appropriate Net::DNS::RR::TSIG methods.  The
       following example creates a TSIG record and sets the fudge to 60
       seconds:
           $key_name = "tsig-key";
           $key      = "awwLOtRfpGE+rRKF2+DEiw==";
           $tsig = Net::DNS::RR->new("$key_name TSIG $key");
           $tsig->fudge(60);
           $query = Net::DNS::Packet->new("www.example.com");
           $query->sign_tsig($tsig);
           $response = $res->send($query);
   sign_sig0
       SIG0 support is provided through the Net::DNS::RR::SIG class. This
       class is not part of the default Net::DNS distribution but resides in
       the Net::DNS::SEC distribution.
           $update = Net::DNS::Update->new("example.com");
           $update->push("update", rr_add("foo.example.com A 10.1.2.3"));
           $update->sign_sig0("Kexample.com+003+25317.private");
       SIG0 support is experimental see Net::DNS::RR::SIG for details.
       The method will call "Carp::croak()" if Net::DNS::RR::SIG cannot be
       found.
   truncate
       The truncate method takes a maximum length as argument and then tries
       to truncate the packet an set the TC bit according to the rules of
       RFC2181 Section 9.
       The minimum maximum length that is honored is 512 octets.
COPYRIGHT
       Copyright (c)1997-2002 Michael Fuhr.
       Portions Copyright (c)2002-2004 Chris Reinhardt.
       Portions Copyright (c)2002-2009 Olaf Kolkman
       Portions Copyright (c)2007-2008 Dick Franks
       All rights reserved.
       This program is free software; you may redistribute it and/or modify it
       under the same terms as Perl itself.
SEE ALSO
       perl, Net::DNS, Net::DNS::Resolver, Net::DNS::Update, Net::DNS::Header,
       Net::DNS::Question, Net::DNS::RR, RFC 1035 Section 4.1, RFC 2136
       Section 2, RFC 2845

perl v5.16.3                      2016-11-05               Net::DNS::Packet(3)