function Query($question, $type = "A")
{
$this->ClearError();
$typeid = $this->types->GetByName($type);
if ($typeid === false) {
$this->SetError("Invalid Query Type " . $type);
return false;
}
if ($this->udp) {
$host = "udp://" . $this->server;
} else {
$host = $this->server;
}
if (!($socket = fsockopen($host, $this->port, $this->timeout))) {
$this->SetError("Failed to Open Socket");
return false;
}
// Split Into Labels
if (preg_match("/[a-z|A-Z]/", $question) == 0) {
$labeltmp = explode(".", $question);
// reverse ARPA format
for ($i = count($labeltmp) - 1; $i >= 0; $i--) {
$labels[] = $labeltmp[$i];
}
$labels[] = "IN-ADDR";
$labels[] = "ARPA";
} else {
// hostname
$labels = explode(".", $question);
}
$question_binary = "";
for ($a = 0; $a < count($labels); $a++) {
$size = strlen($labels[$a]);
$question_binary .= pack("C", $size);
// size byte first
$question_binary .= $labels[$a];
// then the label
}
$question_binary .= pack("C", 0);
// end it off
$this->Debug("Question: " . $question . " (type=" . $type . "/" . $typeid . ")");
$id = rand(1, 255) | rand(0, 255) << 8;
// generate the ID
// Set standard codes and flags
$flags = 0x100 & 0x300;
// recursion & queryspecmask
$opcode = 0x0;
// opcode
// Build the header
$header = "";
$header .= pack("n", $id);
$header .= pack("n", $opcode | $flags);
$header .= pack("nnnn", 1, 0, 0, 0);
$header .= $question_binary;
$header .= pack("n", $typeid);
$header .= pack("n", 0x1);
// internet class
$headersize = strlen($header);
$headersizebin = pack("n", $headersize);
$this->Debug("Header Length: " . $headersize . " Bytes");
$this->DebugBinary($header);
if ($this->udp && $headersize >= 512) {
$this->SetError("Question too big for UDP (" . $headersize . " bytes)");
fclose($socket);
return false;
}
if ($this->udp) {
if (!fwrite($socket, $header, $headersize)) {
$this->SetError("Failed to write question to socket");
fclose($socket);
return false;
}
if (!($this->rawbuffer = fread($socket, 4096))) {
$this->SetError("Failed to write read data buffer");
fclose($socket);
return false;
}
} else {
if (!fwrite($socket, $headersizebin)) {
$this->SetError("Failed to write question length to TCP socket");
fclose($socket);
return false;
}
if (!fwrite($socket, $header, $headersize)) {
$this->SetError("Failed to write question to TCP socket");
fclose($socket);
return false;
}
if (!($returnsize = fread($socket, 2))) {
$this->SetError("Failed to read size from TCP socket");
fclose($socket);
return false;
}
$tmplen = unpack("nlength", $returnsize);
$datasize = $tmplen['length'];
$this->Debug("TCP Stream Length Limit " . $datasize);
if (!($this->rawbuffer = fread($socket, $datasize))) {
$this->SetError("Failed to read data buffer");
fclose($socket);
return false;
}
}
fclose($socket);
$buffersize = strlen($this->rawbuffer);
$this->Debug("Read Buffer Size " . $buffersize);
if ($buffersize < 12) {
$this->SetError("Return Buffer too Small");
return false;
}
$this->rawheader = substr($this->rawbuffer, 0, 12);
// first 12 bytes is the header
$this->rawresponse = substr($this->rawbuffer, 12);
// after that the response
$this->responsecounter = 12;
// start parsing response counter from 12 - no longer using response so can do pointers
$this->DebugBinary($this->rawbuffer);
$this->header = unpack("nid/nspec/nqdcount/nancount/nnscount/narcount", $this->rawheader);
$answers = $this->header['ancount'];
$this->Debug("Query Returned " . $answers . " Answers");
$dns_answer = new DNSAnswer();
// Deal with the header question data
if ($this->header['qdcount'] > 0) {
$this->Debug("Found " . $this->header['qdcount'] . " Questions");
for ($a = 0; $a < $this->header['qdcount']; $a++) {
$c = 1;
while ($c != 0) {
$c = hexdec(bin2hex($this->ReadResponse(1)));
}
$extradata = $this->ReadResponse(4);
}
}
// New Functional Method
for ($a = 0; $a < $this->header['ancount']; $a++) {
$record = $this->ReadRecord();
$dns_answer->AddResult($record['header']['type'], $record['typeid'], $record['header']['class'], $record['header']['ttl'], $record['data'], $record['domain'], $record['string'], $record['extras']);
}
$this->lastnameservers = new DNSAnswer();
for ($a = 0; $a < $this->header['nscount']; $a++) {
$record = $this->ReadRecord();
$this->lastnameservers->AddResult($record['header']['type'], $record['typeid'], $record['header']['class'], $record['header']['ttl'], $record['data'], $record['domain'], $record['string'], $record['extras']);
}
$this->lastadditional = new DNSAnswer();
for ($a = 0; $a < $this->header['arcount']; $a++) {
$record = $this->ReadRecord();
$this->lastadditional->AddResult($record['header']['type'], $record['typeid'], $record['header']['class'], $record['header']['ttl'], $record['data'], $record['domain'], $record['string'], $record['extras']);
}
return $dns_answer;
}
