/**
* opens a socket connection to the DNS server
*
* @return boolean
* @access public
*
*/
public function open()
{
//
// create the socket
//
if (Net_DNS2::isIPv4($this->host) == true) {
$this->sock = @socket_create(AF_INET, $this->type, $this->type == Net_DNS2_Socket::SOCK_STREAM ? SOL_TCP : SOL_UDP);
} else {
if (Net_DNS2::isIPv6($this->host) == true) {
$this->sock = @socket_create(AF_INET6, $this->type, $this->type == Net_DNS2_Socket::SOCK_STREAM ? SOL_TCP : SOL_UDP);
} else {
$this->last_error = 'invalid address type: ' . $this->host;
return false;
}
}
if ($this->sock === false) {
$this->last_error = socket_strerror(socket_last_error());
return false;
}
@socket_set_option($this->sock, SOL_SOCKET, SO_REUSEADDR, 1);
//
// bind to a local IP/port if it's set
//
if (strlen($this->local_host) > 0) {
$result = @socket_bind($this->sock, $this->local_host, $this->local_port > 0 ? $this->local_port : null);
if ($result === false) {
$this->last_error = socket_strerror(socket_last_error());
return false;
}
}
//
// mark the socket as non-blocking
//
if (@socket_set_nonblock($this->sock) === false) {
$this->last_error = socket_strerror(socket_last_error());
return false;
}
//
// connect to the socket; don't check for status here, we'll check it on the
// socket_select() call so we can handle timeouts properly
//
@socket_connect($this->sock, $this->host, $this->port);
$read = null;
$write = array($this->sock);
$except = null;
//
// select on write to check if the call to connect worked
//
$result = @socket_select($read, $write, $except, $this->timeout);
if ($result === false) {
$this->last_error = socket_strerror(socket_last_error());
return false;
} else {
if ($result == 0) {
$this->last_error = 'timeout on write select for connect()';
return false;
}
}
return true;
}
/**
* opens a socket connection to the DNS server
*
* @return boolean
* @access public
*
*/
public function open()
{
//
// create the socket
//
if (Net_DNS2::isIPv4($this->host) == true) {
$this->_sock = @socket_create(AF_INET, $this->type, $this->type == SOCK_STREAM ? SOL_TCP : SOL_UDP);
} else {
if (Net_DNS2::isIPv6($this->host) == true) {
$this->_sock = @socket_create(AF_INET6, $this->type, $this->type == SOCK_STREAM ? SOL_TCP : SOL_UDP);
} else {
$this->last_error = 'invalid address type: ' . $this->host;
return false;
}
}
if ($this->_sock === false) {
$this->last_error = socket_strerror(socket_last_error());
return false;
}
@socket_set_option($this->_sock, SOL_SOCKET, SO_REUSEADDR, 1);
//
// bind to a local IP/port if it's set
//
if (strlen($this->local_host) > 0) {
$result = @socket_bind($this->_sock, $this->local_host, $this->local_port > 0 ? $this->local_port : null);
if ($result === false) {
$this->last_error = socket_strerror(socket_last_error());
return false;
}
}
//
// connect to the socket
//
if (@socket_connect($this->_sock, $this->host, $this->port) === false) {
$this->last_error = socket_strerror(socket_last_error());
return false;
}
//
// mark the socket as non-blocking
//
if (@socket_set_nonblock($this->_sock) === false) {
$this->last_error = socket_strerror(socket_last_error());
return false;
}
return true;
}
/**
* parses the rdata portion from a standard DNS config line
*
* @param array $rdata a string split line of values for the rdata
*
* @return boolean
* @access protected
*
*/
protected function rrFromString(array $rdata)
{
//
// load the data
//
$precedence = array_shift($rdata);
$gateway_type = array_shift($rdata);
$algorithm = array_shift($rdata);
$gateway = strtolower(trim(array_shift($rdata)));
$key = array_shift($rdata);
//
// validate it
//
switch ($gateway_type) {
case self::GATEWAY_TYPE_NONE:
$gateway = '';
break;
case self::GATEWAY_TYPE_IPV4:
if (Net_DNS2::isIPv4($gateway) == false) {
return false;
}
break;
case self::GATEWAY_TYPE_IPV6:
if (Net_DNS2::isIPv6($gateway) == false) {
return false;
}
break;
case self::GATEWAY_TYPE_DOMAIN:
// do nothing
break;
default:
return false;
}
//
// check the algorithm and key
//
switch ($algorithm) {
case self::ALGORITHM_NONE:
$key = '';
break;
case self::ALGORITHM_DSA:
case self::ALGORITHM_RSA:
// do nothing
break;
default:
return false;
}
//
// store the values
//
$this->precedence = $precedence;
$this->gateway_type = $gateway_type;
$this->algorithm = $algorithm;
$this->gateway = $gateway;
$this->key = $key;
return true;
}
/**
* opens a socket connection to the DNS server
*
* @return boolean
* @access public
*
*/
public function open()
{
//
// create a list of options for the context
//
$opts = array('socket' => array());
//
// bind to a local IP/port if it's set
//
if (strlen($this->local_host) > 0) {
$opts['socket']['bindto'] = $this->local_host;
if ($this->local_port > 0) {
$opts['socket']['bindto'] .= ':' . $this->local_port;
}
}
//
// create the context
//
$this->_context = @stream_context_create($opts);
//
// create socket
//
$errno;
$errstr;
switch ($this->type) {
case Net_DNS2_Socket::SOCK_STREAM:
if (Net_DNS2::isIPv4($this->host) == true) {
$this->sock = @stream_socket_client('tcp://' . $this->host . ':' . $this->port, $errno, $errstr, $this->timeout, STREAM_CLIENT_CONNECT, $this->_context);
} else {
if (Net_DNS2::isIPv6($this->host) == true) {
$this->sock = @stream_socket_client('tcp://[' . $this->host . ']:' . $this->port, $errno, $errstr, $this->timeout, STREAM_CLIENT_CONNECT, $this->_context);
} else {
$this->last_error = 'invalid address type: ' . $this->host;
return false;
}
}
break;
case Net_DNS2_Socket::SOCK_DGRAM:
if (Net_DNS2::isIPv4($this->host) == true) {
$this->sock = @stream_socket_client('udp://' . $this->host . ':' . $this->port, $errno, $errstr, $this->timeout, STREAM_CLIENT_CONNECT, $this->_context);
} else {
if (Net_DNS2::isIPv6($this->host) == true) {
$this->sock = @stream_socket_client('udp://[' . $this->host . ']:' . $this->port, $errno, $errstr, $this->timeout, STREAM_CLIENT_CONNECT, $this->_context);
} else {
$this->last_error = 'invalid address type: ' . $this->host;
return false;
}
}
break;
default:
$this->last_error = 'Invalid socket type: ' . $this->type;
return false;
}
if ($this->sock === false) {
$this->last_error = $errstr;
return false;
}
//
// set it to non-blocking and set the timeout
//
@stream_set_blocking($this->sock, 0);
@stream_set_timeout($this->sock, $this->timeout);
return true;
}
/**
* builds a new Net_DNS2_Packet_Request object
*
* @param string $name the domain name for the packet
* @param string $type the DNS RR type for the packet
* @param string $class the DNS class for the packet
*
* @return boolean
* @throws Net_DNS2_Exception
* @access public
*
*/
public function set($name, $type = 'A', $class = 'IN')
{
//
// generate a new header
//
$this->header = new Net_DNS2_Header();
//
// add a new question
//
$q = new Net_DNS2_Question();
//
// allow queries directly to . for the root name servers
//
if ($name != '.') {
$name = trim(strtolower($name), " \t\n\r\v.");
}
$type = strtoupper(trim($type));
$class = strtoupper(trim($class));
//
// check that the input string has some data in it
//
if (empty($name)) {
throw new Net_DNS2_Exception('empty query string provided', Net_DNS2_Lookups::E_PACKET_INVALID);
}
//
// if the type is "*", rename it to "ANY"- both are acceptable.
//
if ($type == '*') {
$type = 'ANY';
}
//
// check that the type and class are valid
//
if (!isset(Net_DNS2_Lookups::$rr_types_by_name[$type]) || !isset(Net_DNS2_Lookups::$classes_by_name[$class])) {
throw new Net_DNS2_Exception('invalid type (' . $type . ') or class (' . $class . ') specified.', Net_DNS2_Lookups::E_PACKET_INVALID);
}
if ($type == 'PTR') {
//
// if it's a PTR request for an IP address, then make sure we tack on
// the arpa domain.
//
// there are other types of PTR requests, so if an IP adress doesn't match,
// then just let it flow through and assume it's a hostname
//
if (Net_DNS2::isIPv4($name) == true) {
//
// IPv4
//
$name = implode('.', array_reverse(explode('.', $name)));
$name .= '.in-addr.arpa';
} else {
if (Net_DNS2::isIPv6($name) == true) {
//
// IPv6
//
$e = Net_DNS2::expandIPv6($name);
if ($e !== false) {
$name = implode('.', array_reverse(str_split(str_replace(':', '', $e))));
$name .= '.ip6.arpa';
} else {
throw new Net_DNS2_Exception('unsupported PTR value: ' . $name, Net_DNS2_Lookups::E_PACKET_INVALID);
}
}
}
}
//
// store the data
//
$q->qname = $name;
$q->qtype = $type;
$q->qclass = $class;
$this->question[] = $q;
//
// the answer, authority and additional are empty; they can be modified
// after the request is created for UPDATE requests if needed.
//
$this->answer = array();
$this->authority = array();
$this->additional = array();
return true;
}
/**
* parses the rdata portion from a standard DNS config line
*
* @param array $rdata a string split line of values for the rdata
*
* @return boolean
* @access protected
*
*/
protected function rrFromString(array $rdata)
{
$value = array_shift($rdata);
if (Net_DNS2::isIPv4($value) == true) {
$this->address = $value;
return true;
}
return false;
}
