/*
*	File: CheckRule.js
*	Author: Espinho
*	Description: Controlla la correttezza dei campi di inserimento di una rule		
*/


function isCorrectIp(ip){
	/*Controlla la correttezza di un ip*/
	if(ip == ""){
		return true;	
	}
	var pattern4 = new RegExp("^[A-Za-z]{1}[A-Za-z0-9\-\.]+$");
	var pattern3 = new RegExp("([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\/([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$");
	var pattern2 = new RegExp("([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\/([0-9]{1,2})$");
	var pattern = new RegExp("([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$");
	if(pattern4.test(ip)){
		return true;
	}else if(pattern3.test(ip)){
		result = pattern3.exec(ip);
		for(i=0;i<8;i++){
			if(result[i+1] > 255){
				return false;
			}
		}
		return true;
	}else if(pattern2.test(ip)){
		result = pattern2.exec(ip);
		for(i=0;i<4;i++){
			if(result[i+1] > 255){
				return false;
			}
		}
		if(result[4] > 32){
			return false;
		}
		return true;
	}else if(pattern.test(ip)){
		result = pattern.exec(ip);
		for(i=0;i<4;i++){
			if(result[i+1] > 255){
				return false;
			}
		}
		return true;
	}else{
		
		return false;
	}
}

function isCorrectPort(port){
	/*Controlla la correttezza di una porta*/
	if(port == ""){
		return true;	
	}
	var pattern = new RegExp("[0-9]+");
	if(pattern.test(port) && port < 65535){
		return true;
	}
	return false;
}

function control(){
	/*Controlla la correttezza dei dati inseriti e restituisce i corrispondenti errori*/
	var source = window.document.getElementById('saddr').value;
	var destination = window.document.getElementById('daddr').value;
	var sport = window.document.getElementById('sport').value;
	var dport = window.document.getElementById('dport').value;
	var errori = "";
	if(!isCorrectIp(source)){
		errori += "Check source address";
	}
	if(!isCorrectIp(destination)){
		if(errori == ""){
			errori += "Check destination address";
		}else{
			errori += ", destination address";
		}
	}
	if(!isCorrectPort(sport)){
		if(errori == ""){
			errori += "Check source port";
		}else{
			errori += ", source port";
		}
	}
	if(!isCorrectPort(dport)){
		if(errori == ""){
			errori += "Check destination port";
		}else{
			errori += ", destination port";
		}
	}
	if(errori == ""){
		window.document.forms[0].submit();
	}else{
		alert(errori);	
	}
}