ftp_base::login

	function login($user=NULL, $pass=NULL) {
		if(!is_null($user)) $this->_login=$user;
		else $this->_login="anonymous";
		if(!is_null($pass)) $this->_password=$pass;
		else $this->_password="anon@anon.com";
		if(!$this->_exec("USER ".$this->_login, "login")) return FALSE;
		if(!$this->_checkCode()) return FALSE;
		if($this->_code!=230) {
			if(!$this->_exec((($this->_code==331)?"PASS ":"ACCT ").$this->_password, "login")) return FALSE;
			if(!$this->_checkCode()) return FALSE;
		}
		$this->SendMSG("Authentication succeeded");
		if(empty($this->_features)) {
			if(!$this->features()) $this->SendMSG("Can't get features list. All supported - disabled");
			else $this->SendMSG("Supported features: ".implode(", ", array_keys($this->_features)));
		}
		return TRUE;
	}