php实现telnet功能示例

<?php
class phptelnet {
    var $show_connect_error=1;

    var $use_usleep=0;  // change to 1 for faster execution
        // don't change to 1 on windows servers unless you have php 5
    var $sleeptime=125000;
    var $loginsleeptime=1000000;

    var $fp=null;
    var $loginprompt;

    var $conn1;
    var $conn2;

    /*
    0 = success
    1 = couldn't open network connection
    2 = unknown host
    3 = login failed
    4 = php version too low
    */
    function connect($server,$user,$pass) {
        $rv=0;
        $vers=explode('.',php_version);
        $needvers=array(4,3,0);
        $j=count($vers);
        $k=count($needvers);
        if ($k<$j) $j=$k;
        for ($i=0;$i<$j;$i++) {
            if (($vers[$i]+0)>$needvers[$i]) break;
            if (($vers[$i]+0)<$needvers[$i]) {
                $this->connecterror(4);
                return 4;
            }
        }

        $this->disconnect();

        if (strlen($server)) {
            if (preg_match('/[^0-9.]/',$server)) {
                $ip=gethostbyname($server);
                if ($ip==$server) {
                    $ip='';
                    $rv=2;
                }
            } else $ip=$server;
        } else $ip='127.0.0.1';

        if (strlen($ip)) {
            if ($this->fp=fsockopen($ip,23)) {
                fputs($this->fp,$this->conn1);
                $this->sleep();

                fputs($this->fp,$this->conn2);
                $this->sleep();
                $this->getresponse($r);
                $r=explode("\n",$r);
                $this->loginprompt=$r[count($r)-1];

                fputs($this->fp,"$user\n");
                $this->sleep();

                fputs($this->fp,"$pass\n");
                if ($this->use_usleep) usleep($this->loginsleeptime);
                else sleep(1);
                $this->getresponse($r);
                $r=explode("\n",$r);
                if (($r[count($r)-1]=='')||($this->loginprompt==$r[count($r)-1])) {
                    $rv=3;
                    $this->disconnect();
                }
            } else $rv=1;
        }

        if ($rv) $this->connecterror($rv);
        return $rv;
    }

    function disconnect($exit=1) {
        if ($this->fp) {
            if ($exit) $this->docommand('exit',$junk);
            fclose($this->fp);
            $this->fp=null;
        }
    }

    function docommand($c,&$r) {
        if ($this->fp) {
            fputs($this->fp,"$c\n");
            $this->sleep();
            $this->getresponse($r);
            $r=preg_replace("/^.*?\n(.*)\n[^\n]*$/","$1",$r);
        }
        return $this->fp?1:0;
    }

    function getresponse(&$r) {
        $r='';
        do {
            $r.=fread($this->fp, 1024);
            $s=socket_get_status($this->fp);
        } while ($s['unread_bytes']);
    }

    function sleep() {
        if ($this->use_usleep) usleep($this->sleeptime);
        else sleep(1);
    }

    function phptelnet() {
        $this->conn1=chr(0xff).chr(0xfb).chr(0x1f).chr(0xff).chr(0xfb).
            chr(0x20).chr(0xff).chr(0xfb).chr(0x18).chr(0xff).chr(0xfb).
            chr(0x27).chr(0xff).chr(0xfd).chr(0x01).chr(0xff).chr(0xfb).
            chr(0x03).chr(0xff).chr(0xfd).chr(0x03).chr(0xff).chr(0xfc).
            chr(0x23).chr(0xff).chr(0xfc).chr(0x24).chr(0xff).chr(0xfa).
            chr(0x1f).chr(0x00).chr(0x50).chr(0x00).chr(0x18).chr(0xff).
            chr(0xf0).chr(0xff).chr(0xfa).chr(0x20).chr(0x00).chr(0x33).
            chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0x2c).chr(0x33).
            chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0xff).chr(0xf0).
            chr(0xff).chr(0xfa).chr(0x27).chr(0x00).chr(0xff).chr(0xf0).
            chr(0xff).chr(0xfa).chr(0x18).chr(0x00).chr(0x58).chr(0x54).
            chr(0x45).chr(0x52).chr(0x4d).chr(0xff).chr(0xf0);
        $this->conn2=chr(0xff).chr(0xfc).chr(0x01).chr(0xff).chr(0xfc).
            chr(0x22).chr(0xff).chr(0xfe).chr(0x05).chr(0xff).chr(0xfc).chr(0x21);
    }

    function connecterror($num) {
        if ($this->show_connect_error) switch ($num) {
        case 1: echo '<br />[php telnet] <a href="//www.jb51.net/php-telnet/errors/fsockopen.php">connect failed: unable to open network connection</a><br />'; break;
        case 2: echo '<br />[php telnet] <a href="//www.jb51.net/php-telnet/errors/unknown-host.php">connect failed: unknown host</a><br />'; break;
        case 3: echo '<br />[php telnet] <a href="//www.jb51.net/php-telnet/errors/login.php">connect failed: login failed</a><br />'; break;
        case 4: echo '<br />[php telnet] <a href="//www.jb51.net/php-telnet/errors/php-version.php">connect failed: your server\'s php version is too low for php telnet</a><br />'; break;
        }
    }
}

?>