function chk_quotes(str)
{
	re = /(\'.*\")|(\".*\')/;
	return str.search(re) == -1;
}


function chk_pd_name(dir)
{
	re = /^[0-9a-zA-Z-_.\/]+$/;
	// forbid /../ and // and ^./ and ^../  and /./  and /..$ and /.$ and ^.$
	re1 = /(\/\.\.\/|\/\/|^\.\/|^\.\.\/|\/\.\/|\/\.\.$|\/\.$|^\.$)/;
	return (dir.search(re) != -1) && (dir.search(re1) == -1);
}

function chk_db_name(db)
{
	re = /^[a-zA-Z]{1}[A-Za-z0-9-_]{0,31}$/;
	return db.search(re) != -1;
}

function chk_db_usr_name(usr)
{
	re = /^[a-zA-Z]{1}[A-Za-z0-9_]{0,15}$/;
	return usr.search(re) != -1;
}

function chk_pos_int(pos_int)
{
	re = /^\s*[1-9]{1}[0-9]*\s*$/;
	return pos_int.search(re) != -1;
}

function chk_sys_login(nm)
{
	re = /^[a-z]{1}[a-z0-9_-]{0,15}$/;
	return nm.search(re) != -1;
}

function chk_mn(mail_name)
{
	re = /^[\w-\+]+((\.)[\w-\+]+)*$/;
	return mail_name.search(re) != -1;
}


function chk_resp_name(resp_name)
{
	return ((resp_name.length > 0) && (resp_name.length <= 245));
}



function chk_login(login)
{
	re = /^[a-zA-Z0-9]{1}[A-Za-z0-9_.-]{0,19}$/;
	return login.search(re) != -1;
}

function chk_realm(realm)
{
	re = /^[^\"]*$/;
	return realm.search(re) != -1;
}

function chk_dom(dom_name)
{
	if ('localhost.rev' == dom_name)
		return false;

	inaddr = /\.in-addr.arpa$/;
	if (dom_name.search(inaddr) != -1)
		return false;

	if (chk_ip(dom_name))	// no domain name like IP address
		return false;

	return true;    // IDN support
	/*
	nore = /\.$/;
	re = /^[A-Za-z0-9]([A-Za-z0-9-]{0,61}[A-Za-z0-9]){0,1}(\.[A-Za-z0-9]([A-Za-z0-9-]{0,61}[A-Za-z0-9]){0,1}){1,}$/;

	return (dom_name.search(nore) == -1) && dom_name.match(re);
	*/
}

function chk_subdom(dom_name)
{
	return true;    // IDN support
	/*
	re = /^[A-Za-z0-9]([A-Za-z0-9-]*[A-Za-z0-9])*$/;
	return dom_name.search(re) != -1;
	*/
}

function chk_email(email)
{
	re = /^([^\@]+){1}\@([^\@]+){1}$/;
	found = email.match(re);
	if (!found)
		return false;
	return chk_mn(found[1]) && chk_dom(found[2]);
}

function chk_url(url)
{
	re = /^((http[s]?|ftp):\/\/)?([^\/:]+)(:\d{1,5})?(\/[^\s\"\'`]*)?$/i;
	found = re.exec(url);
	if (!found)
		return false;

	return chk_dom(found[3]);
}

function chk_ip(ip)
{
	re = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/;
	found = ip.match(re);
	if (!found)
		return false;
	for (i = found.length; i-- > 1;) {
		if ((found[i] < 0) || (found[i] > 255))
			return false;
	}
	return true;
}

function chk_mask(mask)
{
	re = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/;
	found = mask.match(re);
	if (!found)
		return false;
	i = found.length - 1;
	while (i && (found[i] == 0)) i--;
	if (!i)
		return true;
	if (
		(found[i] != 128) &&
		(found[i] != 192) &&
		(found[i] != 224) &&
		(found[i] != 240) &&
		(found[i] != 248) &&
		(found[i] != 252) &&
		(found[i] != 254) &&
		(found[i] != 255)
	)
		return false;
	i--;
	while (i && (found[i] == 255)) i--;

	return i == 0;
}

function dot_to_num(str)
{
	var num = 0;
	var re = /^(\d{1,3})\.(\d{1,3})\.(\d{1,3})\.(\d{1,3})$/;

	found = str.match(re);
	if (!found)
		return null;
	for (i = 0; ++i < found.length; ) {
		num <<= 8;
		num  |= found[i];
	}
	return num;
}

function chk_ip_mask(ip, mask)
{
	if (!chk_ip(ip) || !chk_mask(mask))
		return false;

	var num_ip;
	var num_mask;

	if ((num_ip = dot_to_num(ip)) == null)
		return false;

	if ((num_mask = dot_to_num(mask)) == null)
		return false;

	// check ip/mask combination for interface:
	// 1) mask not null
	// 2) host part not null (num_ip & ~num_mask)
	// 3) host part not all 1 ~((num_ip & ~num_mask) | num_mask)
	return num_mask && (((num_ip & ~num_mask) && ~((num_ip & ~num_mask) | num_mask)) || (mask == '255.255.255.255'));
}

function chk_net_mask(net, mask)
{
	if (!chk_ip(net) || !chk_mask(mask))
		return false;

	var num_net;
	var num_mask;

	if ((num_net = dot_to_num(net)) == null)
		return false;

	if ((num_mask = dot_to_num(mask)) == null)
		return false;

	return num_mask && (num_net & num_mask) && ((num_net & num_mask) == num_net);
}

function chk_sys_passwd(username, passwd)
{
	if ((passwd.length < 5) || (passwd.length > 14))
		return false;

	if (passwd.length >= username.length) {
		if (passwd.indexOf(username, 0) != -1)
			return false;
	}

	if ((passwd.indexOf('\'') != -1) || (passwd.indexOf(' ') != -1))
		return false;

	for (i = passwd.length; i-- > 0;) {
		if (passwd.charCodeAt(i) > 127)
			return false;
	}

	return true;
}

function chk_filename(filename)
{
	re = /^[^\']*$/;
	return filename.search(re) != -1;

}

function chk_uint(uint)
{
	re = /^[0-9]+$/;
	found = uint.match(re);
	if (!found) {
		return false;
	}

	return true;
}