php实现telnet功能示例

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,"$usern");
$this->Sleep();fputs($this->fp,"$passn");
if ($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($this->fp,"$cn");
$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 '
[PHP Telnet]
'; break;
case 2: echo '
[PHP Telnet]
'; break;
case 3: echo '
[PHP Telnet]
'; break;
case 4: echo '
[PHP Telnet]
'; break;
}
}
}?>