socket.php

This is the script which used on 10minutemail.com for temporary email.

<?php
//
// +----------------------------------------------------------------------+
// | PHP Version 4                                                        |
// +----------------------------------------------------------------------+
// | Copyright (c) 1997-2003 The PHP Group                                |
// +----------------------------------------------------------------------+
// | This source file is subject to version 2.0 of the PHP license,       |
// | that is bundled with this package in the file LICENSE, and is        |
// | available at through the world-wide-web at                           |
// | http://www.php.net/license/2_02.txt.                                 |
// | If you did not receive a copy of the PHP license and are unable to   |
// | obtain it through the world-wide-web, please send a note to          |
// | [e-mail] so we can mail you a copy immediately.               |
// +----------------------------------------------------------------------+
// | Authors: Stig Bakken <[e-mail]>                                   |
// |          Chuck Hagenbuch <[e-mail]>                           |
// +----------------------------------------------------------------------+
//
// $Id: Socket.php,v 1.31 2007/05/04 04:30:29 chagenbu Exp $

require_once 'PEAR.php';

define('NET_SOCKET_READ',  1);
define('NET_SOCKET_WRITE', 2);
define('NET_SOCKET_ERROR', 4);

/**
 * Generalized Socket class.
 *
 * @version 1.1
 * @author Stig Bakken <[e-mail]>
 * @author Chuck Hagenbuch <[e-mail]>
 */
class Net_Socket extends PEAR {

    /**
     * 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.
     * @param array   $options     See options for stream_context_create.
     *
     * @access public
     *
     * @return boolean | PEAR_Error  True on success or a PEAR_Error on failure.
     */
    function connect($addr, $port = 0, $persistent = null, $timeout = null, $options = null)
    {
        if (is_resource($this->fp)) {
            @fclose($this->fp);
            $this->fp = null;
        }

        if (!$addr) {
            return $this->raiseError('$addr 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;
        $errstr = '';
        if ($options && function_exists('stream_context_create')) {
            if ($this->timeout) {
                $timeout = $this->timeout;
            } else {
                $timeout = 0;
            }
            $context = stream_context_create($options);
            $fp = @$openfunc($this->addr, $this->port, $errno, $errstr, $timeout, $context);
        } else {
            if ($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, $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);
    }

    /**
     * Sets the file buffering size on the stream.
     * See php's stream_set_write_buffer for more information.
     *
     * @param integer $size     Write buffer size.
     * @access public
     * @return mixed on success or an PEAR_Error object otherwise
     */
    function setWriteBuffer($size)
    {
        if (!is_resource($this->fp)) {
            return $this->raiseError('not connected');
        }

        $returned = stream_set_write_buffer($this->fp, $code);
        if ($returned == 0) {
            return true;
        }
        return $this->raiseError('Cannot set write buffer.');
    }

    /**
     * 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)