自动重启交换机

<?php
error_reporting(-1); 
class Telnet {
var $sock = NULL;  
function telnet($host,$port) {
  $this->sock = fsockopen($host,$port);
  socket_set_timeout($this->sock,2,0);
 }
 
function close() {
  if ($this->sock)  fclose($this->sock);
  $this->sock = NULL;
 }
  
function write($buffer) {
  $buffer = str_replace(chr(255),chr(255).chr(255),$buffer);
  fwrite($this->sock,$buffer);
 }
  
function getc() {
  return fgetc($this->sock); 
 }
 
function read_till($what) {
  $buf = '';
  while (1) {
   $IAC = chr(255);    
   $DONT = chr(254);
   $DO = chr(253);    
   $WONT = chr(252);
   $WILL = chr(251);    
   $theNULL = chr(0);  
   $c = $this->getc();    
   if ($c === false) return $buf;
   if ($c == $theNULL) {
    continue;
   }  
   if ($c == "1") {
    continue;
   } 
   if ($c != $IAC) {
    $buf .= $c;   
    if ($what == (substr($buf,strlen($buf)-strlen($what)))) {
     return $buf;
    }
    else {
     continue;
    }
   } 
   $c = $this->getc();    
   if ($c == $IAC) {
   $buf .= $c;
   }
   else if (($c == $DO) || ($c == $DONT)) {
    $opt = $this->getc();
    // echo "we wont ".ord($opt)."\n";
    fwrite($this->sock,$IAC.$WONT.$opt);
   }
   elseif (($c == $WILL) || ($c == $WONT)) {
    $opt = $this->getc();
    // echo "we dont ".ord($opt)."\n";
    fwrite($this->sock,$IAC.$DONT.$opt);
   }
   else {
    // echo "where are we? c=".ord($c)."\n";
   }
  }
 }
}

$ips = array('172.22.91.2','172.22.92.2','172.22.93.2');
for ($i=0; $i < count($ips); $i++) { 
  $telnet = new telnet($ips[$i],23);
  $telnet->read_till("Username: ");
  $telnet->write("admin\r\n");
  $telnet->read_till("Password: ");
  $telnet->write("qifu@123\r\n");
  $telnet->write("\r\n");
  $telnet->read_till("> ");
  $telnet->write("reboot\r\n");
  sleep(10);
  $telnet->write("Y\r\n");
  $telnet->close(); 
}```