function data($packet, $offset)
{
$data = $packet->dn_comp($this->qname, $offset);
$data .= pack('n', Net_DNS::typesbyname(strtoupper($this->qtype)));
$data .= pack('n', Net_DNS::classesbyname(strtoupper($this->qclass)));
return $data;
}
/**
* Parses a resource record section of a packet
*
* Examines a DNS packet at the specified offset and parses the data
* of a section which contains RRs (ANSWER, AUTHORITY, ADDITIONAL).
*
* @param string $data The packet data returned from the server
* @param integer $offset The location offset of the start of the resource
* record section.
* @return array An array of type array($rr, $offset) where $rr
* is a Net_DNS_RR object and $offset is the
* location of the next section of the packet which
* needs to be parsed.
*/
function parse_rr($data, $offset)
{
list($name, $offset) = $this->dn_expand($data, $offset);
if ($name === null) {
return array(null, null);
}
if (strlen($data) < $offset + 10) {
return array(null, null);
}
$a = unpack("@{$offset}/n2tc/Nttl/nrdlength", $data);
$type = $a['tc1'];
$class = $a['tc2'];
$ttl = $a['ttl'];
$rdlength = $a['rdlength'];
$type = Net_DNS::typesbyval($type);
$class = Net_DNS::classesbyval($class);
$offset += 10;
if (strlen($data) < $offset + $rdlength) {
return array(null, null);
}
$rrobj =& Net_DNS_RR::factory(array($name, $type, $class, $ttl, $rdlength, $data, $offset));
if (is_null($rrobj)) {
return array(null, null);
}
$offset += $rdlength;
return array($rrobj, $offset);
}
function data(&$packet, $offset)
{
$data = $packet->dn_comp($this->name, $offset);
$data .= pack('n', Net_DNS::typesbyname(strtoupper($this->type)));
$data .= pack('n', Net_DNS::classesbyname(strtoupper($this->class)));
$data .= pack('N', $this->ttl);
$offset += strlen($data) + 2;
// The 2 extra bytes are for rdlength
$rdata = $this->rdata($packet, $offset);
$data .= pack('n', strlen($rdata));
$data .= $rdata;
return $data;
}
function error()
{
if ($this->error != 0) {
$rcode = Net_DNS::rcodesbyval($error);
}
return $rcode;
}
/**
* Returns the binary data containing the properties of the header
*
* Packs the properties of the Header object into a binary string
* suitable for using as the Header section of a DNS packet.
*
* @return string binary representation of the header object
* @access public
*/
function data()
{
$opcode = Net_DNS::opcodesbyname($this->opcode);
$rcode = Net_DNS::rcodesbyname($this->rcode);
$byte2 = $this->qr << 7 | $opcode << 3 | $this->aa << 2 | $this->tc << 1 | $this->rd;
$byte3 = $this->ra << 7 | $rcode;
return pack('nC2n4', $this->id, $byte2, $byte3, $this->qdcount, $this->ancount, $this->nscount, $this->arcount);
}
