php无阻塞SSH客户端实例

class FSSH{
 private $conn;
 private $shell;

 /**
 * key=String 密码认证,key=array('pub'=>,'pri'=>,'type'=>,'phrase'=>)密钥认证
 * 密钥认证type分为两种：ssh-rsa,ssh-dss
 * $host[addr]=String 地址,$host['fp']=array() 服务器指纹
 */
 function __construct($host,$user,$key){
  if(empty($host['addr'])){
   debug_print('Host cant't be empty',E_USER_ERROR);
  }
  if(empty($host['fp'])){
   debug_print('finger print is not specified',E_USER_ERROR);
  }
  $this->stdin=fopen('php://stdin','r');
  $this->stdout=fopen('php://stdout','w');
  if(false!==strpos($host['addr'],':')){
   $temp=explode(':',$host['addr']);
   $host['addr']=$temp[0];
   $port=$temp[1];
  }else{
   $port=22;
  }
  if(is_string($key) || empty($key['type'])){
   $methods=null;
  }else{
   $methods=array('hostkey'=>$key['type']);
  }
  $conn=ssh2_connect($host['addr'],$port,$methods,array('disconnect'=>array($this,'disconnect')));
  $fp=ssh2_fingerprint($conn,SSH2_FINGERPRINT_MD5);
  $success=false;
  $fpOK=false;
  if(in_array($fp,$host['fp'])){
   $fpOK=true;
  }else{
   fwrite($this->stdout,"$fpnIs fingerprint OK ?(y/n)");
   $input=strtolower(stream_get_line($this->stdin,1));
   if($input=='y'){
    $fpOK=true;
   }else{
    $fpOK=false;
   }
  }
  if($fpOK){
   if(is_array($key)){
    if (ssh2_auth_pubkey_file($conn,$user,$key['pub'],$key['pri'],$key['phrase'])){
     $success=true;
    }else{
     debug_print('Public Key Authentication Failed',E_USER_ERROR);
    }
   }elseif(is_string($key)){
    if(ssh2_auth_password($conn,$user,$key)){
     $success=true;
    }else{
     debug_print('Password Authentication Failed',E_USER_ERROR);
    }
   }
  }else{
   debug_print('Fingerprint is invalid',E_USER_ERROR);
  }
  if($success){
   $this->conn=$conn;
   $this->shell=ssh2_shell($conn,null,null,1024);
  }
  return $success;
 }

 function shell(){
  //最后一条命令
  $last='';
  //先结束shell，再结束while
  $signalTerminate=false;
  while(true){
   $cmd=$this->fread($this->stdin);
   $out=stream_get_contents($this->shell,1024);
   if(!empty($out) and !empty($last)){
    $l1=strlen($out);
    $l2=strlen($last);
    $l=$l1>$l2?$l2:$l1;
    $last=substr($last,$l);
    $out=substr($out,$l);
   }
   echo ltrim($out);
   if($signalTerminate){
    break;
   }
   if(in_array(trim($cmd),array('exit'))){
    $signalTerminate=true;
   }
   if(!empty($cmd)){
    $last=$cmd;
    fwrite($this->shell,$cmd);
   }
  }
 }

 //解决windows命令行的读取问题，没有别的办法了。
 private function fread($fd){
  static $data='';
  $read = array($fd);
  $write = array();
  $except = array();
  $result = stream_select($read,$write,$except,0,1000);
  if($result === false)
   debug_print('stream_select failed',E_USER_ERROR);
  if($result !== 0){
   $c= stream_get_line($fd,1);
   if($c!=chr(13))
    $data.=$c;
   if($c==chr(10)){
    $t=$data;
    $data='';
    return $t;
   }
  }
 }

 function __destruct(){
  fclose($this->stdin);
  fclose($this->stdout);
  $this->disconnect();
 }

 private function disconnect(){
  if(is_resource($this->conn)){
   unset($this->conn);
   fclose($this->shell);
  }
 }
}

//$ssh=new FSSH(array('addr'=>'x.x.x.x:22','fp'=>array('')),'tunnel',array('pub'=>'E:Identity.pub','pri'=>'E:Identity','type'=>'ssh-rsa'));
$ssh=new FSSH(array('addr'=>'192.168.2.205','fp'=>array('54ECC700B844DCF0D40554A56C57C01E')),'root','123456');
$ssh->shell();