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socket.php
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Sat, Feb 1, 8:58 AM

socket.php
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<?php
/**
* @version $Id: socket.php 12734 2009-10-20 19:28:11Z alex $
* @package In-Portal
* @copyright Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
* @license GNU/GPL
* In-Portal is Open Source software.
* This means that this software may have been modified pursuant
* the GNU General Public License, and as distributed it includes
* or is derivative of works licensed under the GNU General Public License
* or other free or open source software licenses.
* See http://www.in-portal.org/license for copyright notices and details.
*/
defined('FULL_PATH') or die('restricted access!');
/**
* Generalized Socket class.
*
*/
class kSocket extends kBase {
/**
* Socket file pointer.
* @var resource $fp
*/
var $fp = null;
/**
* Whether the socket is blocking. Defaults to true.
* @var boolean $blocking
*/
var $blocking = true;
/**
* Whether the socket is persistent. Defaults to false.
* @var boolean $persistent
*/
var $persistent = false;
/**
* The IP address to connect to.
* @var string $addr
*/
var $addr = '';
/**
* The port number to connect to.
* @var integer $port
*/
var $port = 0;
/**
* Number of seconds to wait on socket connections before assuming
* there's no more data. Defaults to no timeout.
* @var integer $timeout
*/
var $timeout = false;
/**
* Number of bytes to read at a time in readLine() and
* readAll(). Defaults to 2048.
* @var integer $lineLength
*/
var $lineLength = 2048;
/**
* Connect to the specified port. If called when the socket is
* already connected, it disconnects and connects again.
*
* @param string $addr IP address or host name.
* @param integer $port TCP port number.
* @param boolean $persistent (optional) Whether the connection is
* persistent (kept open between requests
* by the web server).
* @param integer $timeout (optional) How long to wait for data.
*
* @access public
*
* @return boolean | PEAR_Error True on success or a PEAR_Error on failure.
*/
function connect($addr, $port = 0, $persistent = null, $timeout = null)
{
if (is_resource($this->fp)) {
@fclose($this->fp);
$this->fp = null;
}
// convert hostname to ip address
if (!$addr) {
return $this->raiseError('host address cannot be empty');
} elseif (strspn($addr, '.0123456789') == strlen($addr) || strstr($addr, '/') !== false) {
$this->addr = $addr;
} else {
$this->addr = @gethostbyname($addr);
}
$this->port = $port % 65536;
if ($persistent !== null) {
$this->persistent = $persistent;
}
if ($timeout !== null) {
$this->timeout = $timeout;
}
$openfunc = $this->persistent ? 'pfsockopen' : 'fsockopen';
$errno = 0;
$errstr = '';
if ($this->timeout) {
$fp = @$openfunc($this->addr, $this->port, $errno, $errstr, $this->timeout);
} else {
$fp = @$openfunc($this->addr, $this->port, $errno, $errstr);
}
if (!$fp) {
return $this->raiseError($errstr, Array($errno));
}
$this->fp = $fp;
return $this->setBlocking($this->blocking);
}
/**
* Disconnects from the peer, closes the socket.
*
* @access public
* @return mixed true on success or an error object otherwise
*/
function disconnect()
{
if (!is_resource($this->fp)) {
return $this->raiseError('not connected');
}
@fclose($this->fp);
$this->fp = null;
return true;
}
/**
* Find out if the socket is in blocking mode.
*
* @access public
* @return boolean The current blocking mode.
*/
function isBlocking()
{
return $this->blocking;
}
/**
* Sets whether the socket connection should be blocking or
* not. A read call to a non-blocking socket will return immediately
* if there is no data available, whereas it will block until there
* is data for blocking sockets.
*
* @param boolean $mode True for blocking sockets, false for nonblocking.
* @access public
* @return mixed true on success or an error object otherwise
*/
function setBlocking($mode)
{
if (!is_resource($this->fp)) {
return $this->raiseError('not connected');
}
$this->blocking = $mode;
socket_set_blocking($this->fp, $this->blocking);
return true;
}
/**
* Sets the timeout value on socket descriptor,
* expressed in the sum of seconds and microseconds
*
* @param integer $seconds Seconds.
* @param integer $microseconds Microseconds.
* @access public
* @return mixed true on success or an error object otherwise
*/
function setTimeout($seconds, $microseconds)
{
if (!is_resource($this->fp)) {
return $this->raiseError('not connected');
}
return socket_set_timeout($this->fp, $seconds, $microseconds);
}
/**
* Returns information about an existing socket resource.
* Currently returns four entries in the result array:
*
* <p>
* timed_out (bool) - The socket timed out waiting for data<br>
* blocked (bool) - The socket was blocked<br>
* eof (bool) - Indicates EOF event<br>
* unread_bytes (int) - Number of bytes left in the socket buffer<br>
* </p>
*
* @access public
* @return mixed Array containing information about existing socket resource or an error object otherwise
*/
function getStatus()
{
if (!is_resource($this->fp)) {
return $this->raiseError('not connected');
}
return socket_get_status($this->fp);
}
/**
* Get a specified line of data
*
* @access public
* @return $size bytes of data from the socket, or a PEAR_Error if
* not connected.
*/
function gets($size)
{
if (!is_resource($this->fp)) {
return $this->raiseError('not connected');
}
return @fgets($this->fp, $size);
}
/**
* Read a specified amount of data. This is guaranteed to return,
* and has the added benefit of getting everything in one fread()
* chunk; if you know the size of the data you're getting
* beforehand, this is definitely the way to go.
*
* @param integer $size The number of bytes to read from the socket.
* @access public
* @return $size bytes of data from the socket, or a PEAR_Error if
* not connected.
*/
function read($size)
{
if (!is_resource($this->fp)) {
return $this->raiseError('not connected');
}
return @fread($this->fp, $size);
}
/**
* Write a specified amount of data.
*
* @param string $data Data to write.
* @param integer $blocksize Amount of data to write at once.
* NULL means all at once.
*
* @access public
* @return mixed true on success or an error object otherwise
*/
function write($data, $blocksize = null)
{
if (!is_resource($this->fp)) {
return $this->raiseError('not connected');
}
if (is_null($blocksize) && !OS_WINDOWS) {
return fwrite($this->fp, $data);
} else {
if (is_null($blocksize)) {
$blocksize = 1024;
}
$pos = 0;
$size = strlen($data);
while ($pos < $size) {
$written = @fwrite($this->fp, substr($data, $pos, $blocksize));
if ($written === false) {
return false;
}
$pos += $written;
}
return $pos;
}
}
/**
* Write a line of data to the socket, followed by a trailing "\r\n".
*
* @access public
* @return mixed fputs result, or an error
*/
function writeLine($data)
{
if (!is_resource($this->fp)) {
return $this->raiseError('not connected');
}
return fwrite($this->fp, $data . "\r\n");
}
/**
* Tests for end-of-file on a socket descriptor.
*
* @access public
* @return bool
*/
function eof()
{
return (is_resource($this->fp) && feof($this->fp));
}
/**
* Read until either the end of the socket or a newline, whichever
* comes first. Strips the trailing newline from the returned data.
*
* @access public
* @return All available data up to a newline, without that
* newline, or until the end of the socket, or a PEAR_Error if
* not connected.
*/
function readLine()
{
if (!is_resource($this->fp)) {
return $this->raiseError('not connected');
}
$line = '';
$timeout = time() + $this->timeout;
while (!feof($this->fp) && (!$this->timeout || time() < $timeout)) {
$line .= @fgets($this->fp, $this->lineLength);
if (substr($line, -1) == "\n") {
return rtrim($line, "\r\n");
}
}
return $line;
}
/**
* Read until the socket closes, or until there is no more data in
* the inner PHP buffer. If the inner buffer is empty, in blocking
* mode we wait for at least 1 byte of data. Therefore, in
* blocking mode, if there is no data at all to be read, this
* function will never exit (unless the socket is closed on the
* remote end).
*
* @access public
*
* @return string All data until the socket closes, or a PEAR_Error if
* not connected.
*/
function readAll()
{
if (!is_resource($this->fp)) {
return $this->raiseError('not connected');
}
$data = '';
while (!feof($this->fp)) {
$data .= @fread($this->fp, $this->lineLength);
}
return $data;
}
function raiseError($text, $params = Array())
{
trigger_error(vsprintf($text, $params), E_USER_WARNING);
return false;
}
}

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