function read($buf)
{
$this->buffer .= $buf;
$ans = new Net_DNS_Packet();
if ($ans->parse($this->buffer)) {
if ($ans->header->qr != '1') {
$this->result(AsyncDNS::RES_ERROR, "Not an answer");
} else {
if ($ans->header->id != $this->packet->header->id) {
$this->result(AsyncDNS::RES_ERROR, "Invalid ID");
}
}
if ($ans->header->ancount <= 0) {
if ($ans->header->rcode === 'FORMERR') {
$this->result(AsyncDNS::RES_ERROR, "FormERR!?");
return;
} else {
$this->result(AsyncDNS::RES_NOTFOUND, $ans);
}
} else {
$this->result(AsyncDNS::RES_FOUND, $ans);
}
}
// unparseable, but maybe next time?
}
/**
* Requests the next RR from a existing transfer started with axfr_start
*
* @return object Net_DNS_RR Returns a Net_DNS_RR object of the next RR
* from a zone transfer.
* @see Net_DNS_Resolver::send_tcp()
*/
function axfr_next()
{
if (!count($this->_axfr_rr)) {
if (!isset($this->_axfr_sock) || !is_resource($this->_axfr_sock)) {
$this->errorstring = 'no zone transfer in progress';
return NULL;
}
$timeout = $this->tcp_timeout;
$buf = $this->read_tcp($this->_axfr_sock, 2, $this->debug);
if (!strlen($buf)) {
$this->errorstring = 'truncated zone transfer';
return NULL;
}
$len = unpack('n1len', $buf);
$len = $len['len'];
if (!$len) {
$this->errorstring = 'truncated zone transfer';
return NULL;
}
$buf = $this->read_tcp($this->_axfr_sock, $len, $this->debug);
if ($this->debug) {
echo ';; received ' . strlen($buf) . "bytes\n";
}
if (strlen($buf) != $len) {
$this->errorstring = 'expected ' . $len . ' bytes, received ' . strlen($buf);
if ($this->debug) {
echo ';; ' . $err . "\n";
}
return NULL;
}
$ans = new Net_DNS_Packet($this->debug);
if (!$ans->parse($buf)) {
if (!$this->errorstring) {
$this->errorstring = 'unknown error during packet parsing';
}
return NULL;
}
if ($ans->header->ancount < 1) {
$this->errorstring = 'truncated zone transfer';
return NULL;
}
if ($ans->header->rcode != 'NOERROR') {
$this->errorstring = 'errorcode ' . $ans->header->rcode . ' returned';
return NULL;
}
foreach ($ans->answer as $rr) {
if ($rr->type == 'SOA') {
if (++$this->_axfr_soa_count < 2) {
array_push($this->_axfr_rr, $rr);
}
} else {
array_push($this->_axfr_rr, $rr);
}
}
if ($this->_axfr_soa_count >= 2) {
unset($this->_axfr_sock);
}
}
$rr = array_shift($this->_axfr_rr);
return $rr;
}
