MAN page from Old RedHat 6.X perl-Net-DNS-0.12-6.i386.rpm
lib::Net::DNS::Header
Section: User Contributed Perl Documentation (3)
Updated: perl 5.005, patch 03
Index NAME
Net::DNS::Header - DNS packet header class
SYNOPSIS
use Net::DNS::Header; DESCRIPTION
A
Net::DNS::Header object represents the header portion of a DNSpacket.
METHODS
new
$header = new Net::DNS::Header; $header = new Net::DNS::Header(\$data);
Without an argument,
new creates a header object appropriatefor making a
DNS query.
If new is passed a reference to a scalar containing DNS packetdata, it creates a header object from that data.
Returns undef if unable to create a header object (e.g., ifthe data is incomplete).
print
$header->print;
Dumps the header data to the standard output.
string
print $header->string;
Returns a string representation of the header object.
id
print "query id = ", $header->id, "\n"; $header->id(1234);
Gets or sets the query identification number.
qr
print "query response flag = ", $header->qr, "\n"; $header->qr(0);
Gets or sets the query response flag.
opcode
print "query opcode = ", $header->opcode, "\n"; $header->opcode("UPDATE");Gets or sets the query opcode (the purpose of the query).
aa
print "answer is ", $header->aa ? "" : "non-", "authoritative\n"; $header->aa(0);
Gets or sets the authoritative answer flag.
tc
print "packet is ", $header->tc ? "" : "not ", "truncated\n"; $header->tc(0);
Gets or sets the truncated packet flag.
rd
print "recursion was ", $header->rd ? "" : "not ", "desired\n"; $header->rd(0);
Gets or sets the recursion desired flag.
ra
print "recursion is ", $header->ra ? "" : "not ", "available\n"; $header->ra(0);
Gets or sets the recursion available flag.
rcode
print "query response code = ", $header->rcode, "\n"; $header->rcode("SERVFAIL");Gets or sets the query response code (the status of the query).
qdcount, zocount
print "# of question records: ", $header->qdcount, "\n"; $header->qdcount(2);
Gets or sets the number of records in the question section of the packet.In dynamic update packets, this field is known as
zocount and refersto the number of RRs in the zone section.
ancount, prcount
print "# of answer records: ", $header->ancount, "\n"; $header->ancount(5);
Gets or sets the number of records in the answer section of the packet.In dynamic update packets, this field is known as
prcount and refersto the number of RRs in the prerequisite section.
nscount, upcount
print "# of authority records: ", $header->nscount, "\n"; $header->nscount(2);
Gets or sets the number of records in the authority section of the packet.In dynamic update packets, this field is known as
upcount and refersto the number of RRs in the update section.
arcount, adcount
print "# of additional records: ", $header->arcount, "\n"; $header->arcount(3);
Gets or sets the number of records in the additional section of the packet.In dynamic update packets, this field is known as
adcount.
data
$hdata = $header->data;
Returns the header data in binary format, appropriate for use in a
DNS query packet.
COPYRIGHT
Copyright (c) 1997 Michael Fuhr. All rights reserved. This program is freesoftware; you can redistribute it and/or modify it under the same terms asPerl itself.
SEE ALSO
the
perl(1) manpage, the
Net::DNS manpage, the
Net::DNS::Resolver manpage, the
Net::DNS::Packet manpage,the
Net::DNS::Update manpage, the
Net::DNS::Question manpage, the
Net::DNS::RR manpage,RFC 1035 Section 4.1.1
Index
- NAME
- SYNOPSIS
- DESCRIPTION
- METHODS
- new
- print
- string
- id
- qr
- opcode
- aa
- tc
- rd
- ra
- rcode
- qdcount, zocount
- ancount, prcount
- nscount, upcount
- arcount, adcount
- data
- COPYRIGHT
- SEE ALSO
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