ผมขอถามเกี่ยวกับการคอนฟิก telnet บน linux หน่อยนะครับ
คือว่าผมใช้โค้ด php telnet บน windows xp เพื่อ remote ไปที่เครื่องที่เป็น linux ผมลองใช้กับ linux centos 4.3
ก็สามารถติดต่อได้ แต่พอลองไปใช้กับ linux mandrake 8.2 กับติดต่อไม่ได้ทั้งๆที่ service ของ telnet ก็เปิดใช้งานแล้ว
ตรงส่วนของ /etc/xinetd.d/telnet ตรง disable = no ก็แก้ไขเรียบร้อยแล้ว แล้วทดลองใช้ผ่าน command ของ windows ก็สามารถที่จะติดต่อได้ แต่พอผ่าน script php กับไม่ได้มันฟ้อง error : login failed ทั้งที่ user กับ password ก็ใช้ตัวเดียวกับที่ใช้กับ command ผมไม่รู้ว่าจะต้องไปคอนฟิกตรงไหนอีก เพื่อที่จะให้ scrip php สามารถ control ได้ครับ
ไฟล์ PHPTelnet.php
<?php
/*
PHPTelnet 1.0
by Antone Roundy
adapted from code found on the PHP website
public domain
*/
class PHPTelnet {
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 $loginprompt;
/*
0 = success
1 = couldn't open network connection
2 = unknown host
3 = login failed
4 = PHP version too low
*/
function Connect($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]) 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($this->fp,chr(0xFF).chr(0xFB).chr(0x1F).chr(0xFF).chr(0xFB).
chr(0x20).chr(0xFF).chr(0xFB).chr(0x18).chr(0xFF).chr(0xFB).
chr(0x27).chr(0xFF).chr(0xFD).chr(0x01).chr(0xFF).chr(0xFB).
chr(0x03).chr(0xFF).chr(0xFD).chr(0x03).chr(0xFF).chr(0xFC).
chr(0x23).chr(0xFF).chr(0xFC).chr(0x24).chr(0xFF).chr(0xFA).
chr(0x1F).chr(0x00).chr(0x50).chr(0x00).chr(0x18).chr(0xFF).
chr(0xF0).chr(0xFF).chr(0xFA).chr(0x20).chr(0x00).chr(0x33).
chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0x2C).chr(0x33).
chr(0x38).chr(0x34).chr(0x30).chr(0x30).chr(0xFF).chr(0xF0).
chr(0xFF).chr(0xFA).chr(0x27).chr(0x00).chr(0xFF).chr(0xF0).
chr(0xFF).chr(0xFA).chr(0x18).chr(0x00).chr(0x58).chr(0x54).
chr(0x45).chr(0x52).chr(0x4D).chr(0xFF).chr(0xF0));
if ($this->use_usleep) usleep($this->sleeptime);
else sleep(1);
fputs($this->fp,chr(0xFF).chr(0xFC).chr(0x01).chr(0xFF).chr(0xFC).
chr(0x22).chr(0xFF).chr(0xFE).chr(0x05).chr(0xFF).chr(0xFC).chr(0x21));
if ($this->use_usleep) usleep($this->sleeptime);
else sleep(1);
$this->GetResponse($r);
$r=explode("\n",$r);
$this->loginprompt=$r[count($r)-1];
fputs($this->fp,"$user\r");
if ($this->use_usleep) usleep($this->sleeptime);
else sleep(1);
fputs($this->fp,"$pass\r");
if ($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;
}
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\r");
if ($this->use_usleep) usleep($this->sleeptime);
else sleep(1);
$this->GetResponse($r);
$r=preg_replace("/^.*?\n(.*)\n[^\n]*$/","$1",$r);
}
return $this->fp?1:0;
}
function GetResponse(&$r) {
$r='';
do {
$r.=fread($this->fp,1000);
$s=socket_get_status($this->fp);
} while ($s['unread_bytes']);
}
}
?>
// if the first argument to Connect is blank,
// PHPTelnet will connect to the local host via 127.0.0.1
$result = $telnet->Connect('192.168.1.2','user','123456');
switch ($result) {
case 0:
$telnet->DoCommand('ls -la', $result);
// NOTE: $result may contain newlines
echo $result;
//$telnet->DoCommand('another command', $result);
//echo $result;
// say Disconnect(0); to break the connection without explicitly logging out
$telnet->Disconnect();
break;
case 1:
echo '[PHP Telnet] Connect failed: Unable to open network connection';
break;
case 2:
echo '[PHP Telnet] Connect failed: Unknown host';
break;
case 3:
echo '[PHP Telnet] Connect failed: Login failed';
break;
case 4:
echo '[PHP Telnet] Connect failed: Your PHP version does not support PHP Telnet';
break;
}
?>
Load balance : Server 02
