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use Net::DNS::Header;
Net::DNS::Header
object represents the header portion of a DNS packet.
$header = new Net::DNS::Header; $header = new Net::DNS::Header(\$data);
Without an argument, new
creates a header object appropriate for making a DNS query.
If new
is passed a reference to a scalar containing DNS packet data, it creates a
header object from that data.
$header->print;
Dumps the header data to the standard output.
print "query id = ", $header->id, "\n"; $header->id(1234);
Gets or sets the query identification number.
print "query response flag = ", $header->qr, "\n"; $header->qr(0);
Gets or sets the query response flag.
print "query opcode = ", $header->opcode, "\n"; $header->opcode("UPDATE");
Gets or sets the query opcode (the purpose of the query).
print "answer is ", $header->aa ? "" : "non-", "authoritative\n"; $header->aa(0);
Gets or sets the authoritative answer flag.
print "packet is ", $header->tc ? "" : "not ", "truncated\n"; $header->tc(0);
Gets or sets the truncated packet flag.
print "recursion was ", $header->rd ? "" : "not ", "desired\n"; $header->rd(0);
Gets or sets the recursion desired flag.
print "recursion is ", $header->ra ? "" : "not ", "available\n"; $header->ra(0);
Gets or sets the recursion available flag.
print "query response code = ", $header->rcode, "\n"; $header->rcode("SERVFAIL");
Gets or sets the query response code (the status of the query).
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 refers to the number of RRs in the zone section.
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 refers to the number of RRs in the prerequisite section.
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 refers to the number of RRs in the update section.
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
.
$hdata = $header->data;
Returns the header data in binary format, appropriate for use in a DNS query packet.
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