611 lines
14 KiB
HTML
611 lines
14 KiB
HTML
<html>
|
|
<head>
|
|
<title>Visual Subnet Calculator</title>
|
|
<script language="javascript" type="text/javascript">
|
|
<!--
|
|
|
|
var visibleColumns = {
|
|
subnet: true,
|
|
netmask: false,
|
|
range: true,
|
|
useable: true,
|
|
hosts: true,
|
|
divide: true,
|
|
join: true,
|
|
};
|
|
|
|
var curNetwork = 0;
|
|
var curMask = 0;
|
|
|
|
function updateNetwork()
|
|
{
|
|
var newNetworkStr = document.forms['calc'].elements['network'].value;
|
|
var newMask = parseInt(document.forms['calc'].elements['netbits'].value);
|
|
|
|
var newNetwork = inet_aton(newNetworkStr);
|
|
|
|
if (newNetwork === null) {
|
|
alert('Invalid network address entered');
|
|
return;
|
|
}
|
|
|
|
var tmpNetwork = network_address(newNetwork, newMask);
|
|
if (newNetwork != tmpNetwork) {
|
|
alert('The network address entered is not on a network boundary for this mask.\nIt has been changed to '+inet_ntoa(tmpNetwork)+'.');
|
|
newNetwork = tmpNetwork;
|
|
document.forms['calc'].elements['network'].value = inet_ntoa(tmpNetwork);
|
|
}
|
|
|
|
if (newMask < 0 || newMask > 32) {
|
|
alert('The network mask you have entered is invalid');
|
|
return;
|
|
}
|
|
|
|
if (curMask == 0) {
|
|
curMask = newMask;
|
|
curNetwork = newNetwork;
|
|
startOver();
|
|
}
|
|
else if (curMask != newMask && confirm('You are changing the base network from /'+curMask+' to /'+newMask+'. This will reset any changes you have made. Proceed?')) {
|
|
curMask = newMask;
|
|
curNetwork = newNetwork;
|
|
|
|
startOver();
|
|
}
|
|
else {
|
|
document.forms['calc'].elements['netbits'].value = curMask;
|
|
curNetwork = newNetwork;
|
|
|
|
recreateTables();
|
|
}
|
|
}
|
|
|
|
function startOver()
|
|
{
|
|
rootSubnet = [0, 0, null];
|
|
|
|
recreateTables();
|
|
}
|
|
|
|
function recreateTables()
|
|
{
|
|
// Update header visibility
|
|
for (const name in visibleColumns) {
|
|
console.log(name)
|
|
document.getElementById(name + 'Header').style.display = visibleColumns[name] ? 'table-cell' : 'none';
|
|
}
|
|
|
|
var calcbody = document.getElementById('calcbody');
|
|
if (!calcbody) {
|
|
alert('Body not found');
|
|
return;
|
|
}
|
|
|
|
while (calcbody.hasChildNodes()) {
|
|
calcbody.removeChild(calcbody.firstChild);
|
|
}
|
|
|
|
updateNumChildren(rootSubnet);
|
|
updateDepthChildren(rootSubnet);
|
|
|
|
createRow(calcbody, rootSubnet, curNetwork, curMask, [curMask, rootSubnet[1], rootSubnet], rootSubnet[0]);
|
|
|
|
document.getElementById('joinHeader').colSpan = (rootSubnet[0] > 0 ? rootSubnet[0] : 1);
|
|
// document.getElementById('col_join').span = (rootSubnet[0] > 0 ? rootSubnet[0] : 1);
|
|
|
|
/* Create the bookmark hyperlink */
|
|
var link = document.getElementById('saveLink');
|
|
if (link) {
|
|
link.href = 'subnets.html?network='+inet_ntoa(curNetwork)+'&mask='+curMask+'&division='+binToAscii(nodeToString(rootSubnet));
|
|
}
|
|
}
|
|
|
|
function nodeToString(node)
|
|
{
|
|
if (node[2]) {
|
|
return '1'+nodeToString(node[2][0])+nodeToString(node[2][1]);
|
|
}
|
|
else {
|
|
return '0';
|
|
}
|
|
}
|
|
|
|
function binToAscii(str)
|
|
{
|
|
var curOut = '';
|
|
var curBit = 0;
|
|
var curChar = 0;
|
|
|
|
for (var i=0; i<str.length; i++) {
|
|
if (str.charAt(i) == '1') {
|
|
curChar |= 1<<curBit;
|
|
}
|
|
curBit++;
|
|
if (curBit > 3) {
|
|
curOut += curChar.toString(16);
|
|
curChar = 0;
|
|
curBit = 0;
|
|
}
|
|
}
|
|
if (curBit > 0) {
|
|
curOut += curChar.toString(16);
|
|
}
|
|
return str.length+'.'+curOut;
|
|
}
|
|
|
|
function asciiToBin(str)
|
|
{
|
|
var re = /([0-9]+)\.([0-9a-f]+)/;
|
|
var res = re.exec(str);
|
|
var len = res[1];
|
|
var encoded = res[2];
|
|
var out = '';
|
|
for (var i=0; i< res[1]; i++) {
|
|
var ch = parseInt(res[2].charAt(Math.floor(i/4)), 16);
|
|
var pos = i % 4;
|
|
out += (ch & (1<<pos) ? '1' : '0');
|
|
}
|
|
return out;
|
|
}
|
|
|
|
function createRow(calcbody, node, address, mask, labels, depth)
|
|
{
|
|
if (node[2]) {
|
|
var newlabels = labels;
|
|
newlabels.push(mask+1);
|
|
newlabels.push(node[2][0][1]);
|
|
newlabels.push(node[2][0]);
|
|
createRow(calcbody, node[2][0], address, mask+1, newlabels, depth-1);
|
|
|
|
newlabels = new Array();
|
|
newlabels.push(mask+1);
|
|
newlabels.push(node[2][1][1]);
|
|
newlabels.push(node[2][1]);
|
|
createRow(calcbody, node[2][1], address+subnet_addresses(mask+1), mask+1, newlabels, depth-1);
|
|
}
|
|
else {
|
|
var newRow = document.createElement('TR');
|
|
calcbody.appendChild(newRow);
|
|
|
|
/* subnet address */
|
|
if (visibleColumns.subnet) {
|
|
var newCell = document.createElement('TD');
|
|
newCell.appendChild(document.createTextNode(inet_ntoa(address)+'/'+mask));
|
|
newRow.appendChild(newCell);
|
|
}
|
|
|
|
var addressFirst = address;
|
|
var addressLast = subnet_last_address(address, mask);
|
|
var useableFirst = address + 1;
|
|
var useableLast = addressLast - 1;
|
|
var numHosts;
|
|
var addressRange;
|
|
var usaebleRange;
|
|
|
|
if (mask == 32) {
|
|
addressRange = inet_ntoa(addressFirst);
|
|
useableRange = addressRange;
|
|
numHosts = 1;
|
|
}
|
|
else {
|
|
addressRange = inet_ntoa(addressFirst)+' - '+inet_ntoa(addressLast);
|
|
if (mask == 31) {
|
|
useableRange = addressRange;
|
|
numHosts = 2;
|
|
}
|
|
else {
|
|
useableRange = inet_ntoa(useableFirst)+' - '+inet_ntoa(useableLast);
|
|
numHosts = (1 + useableLast - useableFirst);
|
|
}
|
|
}
|
|
|
|
/* netmask */
|
|
if (visibleColumns.netmask) {
|
|
var newCell = document.createElement('TD');
|
|
newCell.appendChild(document.createTextNode(inet_ntoa(subnet_netmask(mask))));
|
|
newRow.appendChild(newCell);
|
|
}
|
|
|
|
/* range of addresses */
|
|
if (visibleColumns.range) {
|
|
var newCell = document.createElement('TD');
|
|
newCell.appendChild(document.createTextNode(addressRange));
|
|
newRow.appendChild(newCell);
|
|
}
|
|
|
|
/* useable addresses */
|
|
if (visibleColumns.useable) {
|
|
var newCell = document.createElement('TD');
|
|
newCell.appendChild(document.createTextNode(useableRange));
|
|
newRow.appendChild(newCell);
|
|
}
|
|
|
|
/* Hosts */
|
|
if (visibleColumns.hosts) {
|
|
var newCell = document.createElement('TD');
|
|
newCell.appendChild(document.createTextNode(numHosts));
|
|
newRow.appendChild(newCell);
|
|
}
|
|
|
|
/* actions */
|
|
|
|
if (visibleColumns.divide) {
|
|
var newCell = document.createElement('TD');
|
|
newRow.appendChild(newCell);
|
|
|
|
if (mask == 32) {
|
|
var newLink = document.createElement('SPAN');
|
|
newLink.className = 'disabledAction';
|
|
newLink.appendChild(document.createTextNode('Divide'));
|
|
newCell.appendChild(newLink);
|
|
}
|
|
else {
|
|
var newLink = document.createElement('A');
|
|
newLink.href = '#';
|
|
newLink.onclick = function () { divide(node); return false; }
|
|
newLink.appendChild(document.createTextNode('Divide'));
|
|
newCell.appendChild(newLink);
|
|
}
|
|
}
|
|
|
|
if (visibleColumns.join) {
|
|
var colspan = depth - node[0];
|
|
|
|
for (var i=(labels.length/3)-1; i>=0; i--) {
|
|
var mask = labels[i*3];
|
|
var rowspan = labels[(i*3)+1];
|
|
var joinnode = labels[(i*3)+2];
|
|
|
|
var newCell = document.createElement('TD');
|
|
newCell.rowSpan = (rowspan > 1 ? rowspan : 1);
|
|
newCell.colSpan = (colspan > 1 ? colspan : 1);
|
|
|
|
if (i == (labels.length/3)-1) {
|
|
newCell.className = 'maskSpan';
|
|
}
|
|
else {
|
|
newCell.className = 'maskSpanJoinable';
|
|
newCell.onclick = newJoin(joinnode);
|
|
// newCell.onmouseover = function() { window.status = joinnode[0]+'---'+joinnode[1]+'---'+joinnode[2]+'>>>>>'+node[2];}
|
|
}
|
|
|
|
var newImg = document.createElement('IMG');
|
|
newImg.src = 'img/'+mask+'.gif';
|
|
newCell.appendChild(newImg);
|
|
newRow.appendChild(newCell);
|
|
|
|
colspan = 1; // reset for subsequent cells
|
|
}
|
|
}
|
|
}
|
|
|
|
}
|
|
|
|
/* This is necessary because 'joinnode' changes during the scope of the caller */
|
|
function newJoin(joinnode)
|
|
{
|
|
return function() { join(joinnode) };
|
|
}
|
|
|
|
function divide(node)
|
|
{
|
|
node[2] = new Array();
|
|
node[2][0] = [0, 0, null];
|
|
node[2][1] = [0, 0, null];
|
|
recreateTables();
|
|
}
|
|
|
|
function join(node)
|
|
{
|
|
/* easy as pie */
|
|
node[2] = null;
|
|
recreateTables();
|
|
}
|
|
|
|
function updateNumChildren(node)
|
|
{
|
|
if (node[2] == null) {
|
|
node[1] = 0;
|
|
return 1;
|
|
}
|
|
else {
|
|
node[1] = updateNumChildren(node[2][0]) + updateNumChildren(node[2][1]);
|
|
return node[1];
|
|
}
|
|
}
|
|
|
|
function updateDepthChildren(node)
|
|
{
|
|
if (node[2] == null) {
|
|
node[0] = 0;
|
|
return 1;
|
|
}
|
|
else {
|
|
node[0] = updateDepthChildren(node[2][0]) + updateDepthChildren(node[2][1]);
|
|
return node[1];
|
|
}
|
|
}
|
|
|
|
|
|
var rootSubnet;
|
|
|
|
// each node is Array:
|
|
// [0] => depth of children, total number of visible children, children
|
|
|
|
|
|
function inet_ntoa(addrint)
|
|
{
|
|
return ((addrint >> 24) & 0xff)+'.'+
|
|
((addrint >> 16) & 0xff)+'.'+
|
|
((addrint >> 8) & 0xff)+'.'+
|
|
(addrint & 0xff);
|
|
}
|
|
|
|
function inet_aton(addrstr)
|
|
{
|
|
var re = /^([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/;
|
|
var res = re.exec(addrstr);
|
|
|
|
if (res === null) {
|
|
return null;
|
|
}
|
|
|
|
for (var i=1; i<=4; i++) {
|
|
if (res[i] < 0 || res[i] > 255) {
|
|
return null;
|
|
}
|
|
}
|
|
|
|
return (res[1] << 24) | (res[2] << 16) | (res[3] << 8) | res[4];
|
|
}
|
|
|
|
function network_address(ip, mask)
|
|
{
|
|
var maskbits = 0;
|
|
for (var i=31-mask; i>=0; i--) {
|
|
ip &= ~ 1<<i;
|
|
}
|
|
return ip;
|
|
}
|
|
|
|
function subnet_addresses(mask)
|
|
{
|
|
return 1<<(32-mask);
|
|
}
|
|
|
|
function subnet_last_address(subnet, mask)
|
|
{
|
|
return subnet + subnet_addresses(mask) - 1;
|
|
}
|
|
|
|
function subnet_netmask(mask)
|
|
{
|
|
return network_address(0xffffffff, mask);
|
|
}
|
|
|
|
|
|
function preloadSubnetImages()
|
|
{
|
|
if (document.images) {
|
|
if (!document.preloadedImages) {
|
|
document.preloadedImages = new Array();
|
|
}
|
|
|
|
for (var i=0; i<=32; i++) {
|
|
var img = new Image();
|
|
img.src = 'img/'+i+'.gif';
|
|
document.preloadedImages.push(img);
|
|
}
|
|
}
|
|
}
|
|
|
|
|
|
function calcOnLoad()
|
|
{
|
|
preloadSubnetImages();
|
|
args = parseQueryString();
|
|
if (args['network'] && args['mask'] && args['division']) {
|
|
document.forms['calc'].elements['network'].value = args['network'];
|
|
document.forms['calc'].elements['netbits'].value = args['mask'];
|
|
updateNetwork();
|
|
var division = asciiToBin(args['division']);
|
|
rootSubnet = [0, 0, null];
|
|
if (division != '0') {
|
|
loadNode(rootSubnet, division);
|
|
}
|
|
recreateTables();
|
|
}
|
|
else {
|
|
updateNetwork();
|
|
}
|
|
}
|
|
|
|
function loadNode(curNode, division)
|
|
{
|
|
if (division.charAt(0) == '0') {
|
|
return division.substr(1);
|
|
}
|
|
else {
|
|
curNode[2] = new Array();
|
|
curNode[2][0] = [0, 0, null];
|
|
curNode[2][1] = [0, 0, null];
|
|
|
|
division = loadNode(curNode[2][0], division.substr(1));
|
|
division = loadNode(curNode[2][1], division);
|
|
return division;
|
|
}
|
|
}
|
|
|
|
|
|
function parseQueryString (str)
|
|
{
|
|
str = str ? str : location.search;
|
|
var query = str.charAt(0) == '?' ? str.substring(1) : str;
|
|
var args = new Object();
|
|
if (query) {
|
|
var fields = query.split('&');
|
|
for (var f = 0; f < fields.length; f++) {
|
|
var field = fields[f].split('=');
|
|
args[unescape(field[0].replace(/\+/g, ' '))] =
|
|
unescape(field[1].replace(/\+/g, ' '));
|
|
}
|
|
}
|
|
return args;
|
|
}
|
|
|
|
window.onload = calcOnLoad;
|
|
|
|
function toggleColumn(cb)
|
|
{
|
|
var colName = 'col_'+(cb.id.substr(3));
|
|
// var col = document.getElementById(colName);
|
|
|
|
visibleColumns[cb.id.substr(3)] = cb.checked;
|
|
|
|
// if (cb.checked) {
|
|
// col.style.display = 'table-column';
|
|
// col.style.visibility = 'visible';
|
|
// }
|
|
// else {
|
|
// col.style.display = 'none';
|
|
// col.style.visibility = 'collapse';
|
|
// }
|
|
recreateTables(); /* because IE draws lines all over the place with border-collapse */
|
|
}
|
|
|
|
//-->
|
|
</script>
|
|
|
|
<style type="text/css">
|
|
|
|
H1 {
|
|
font-family: Arial, Verdana, sans-serif;
|
|
font-size: 18pt;
|
|
}
|
|
|
|
BODY {
|
|
font-family: Arial, Verdana, sans-serif;
|
|
}
|
|
|
|
P {
|
|
font-family: Arial, Verdana, sans-serif;
|
|
font-size: 75%;
|
|
}
|
|
|
|
.label {
|
|
font-family: Arial, Verdana, sans-serif;
|
|
font-size: 60%;
|
|
}
|
|
|
|
.calc {
|
|
font-family: Arial, Verdana, sans-serif;
|
|
font-size: 80%;
|
|
border-collapse: collapse;
|
|
}
|
|
|
|
.calc td, .calc th {
|
|
border: 1px solid black;
|
|
}
|
|
|
|
.calc thead {
|
|
font-weight: bold;
|
|
background-color: #eeeeee;
|
|
}
|
|
|
|
.disabledAction {
|
|
color: #dddddd;
|
|
}
|
|
|
|
.maskSpan {
|
|
background-color: #cccccc;
|
|
text-align: right;
|
|
}
|
|
.maskSpanJoinable {
|
|
background-color: #cccccc;
|
|
text-align: right;
|
|
cursor: hand;
|
|
}
|
|
|
|
.maskSpanRotate {
|
|
filter:progid:DXImageTransform.Microsoft.BasicImage(rotation=1);
|
|
background-color:green;
|
|
}
|
|
|
|
</style>
|
|
</head>
|
|
<body>
|
|
|
|
<table width="100%">
|
|
<tr valign=top>
|
|
<td>
|
|
|
|
<h1>Visual Subnet Calculator</h1>
|
|
|
|
<p>Enter the network you wish to subnet:</p>
|
|
|
|
<form name="calc" onsubmit="updateNetwork(); return false;">
|
|
|
|
<table cellspacing="0">
|
|
<tr>
|
|
<td class="label">Network Address</td>
|
|
<td class="label">Mask bits</td>
|
|
</tr>
|
|
<tr>
|
|
<td><input type="text" name="network" size="15" maxlength="15" value="192.168.0.0"></td>
|
|
<td>/<input type="text" name="netbits" size="2" maxlength="2" value="16"></td>
|
|
<td><input type="submit" value="Update">
|
|
<input type="button" value="Reset" onclick="if (confirm('This will reset all subnet divisions you have made. Proceed?')) startOver();">
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<p>Show columns:
|
|
<input type="checkbox" id="cb_subnet" checked onclick="toggleColumn(this)"><label for="cb_subnet">Subnet address</label>
|
|
<input type="checkbox" id="cb_netmask" onclick="toggleColumn(this)"><label for="cb_netmask">Netmask</label>
|
|
<input type="checkbox" id="cb_range" checked onclick="toggleColumn(this)"><label for="cb_range">Range of addresses</label>
|
|
<input type="checkbox" id="cb_useable" checked onclick="toggleColumn(this)"><label for="cb_useable">Useable IPs</label>
|
|
<input type="checkbox" id="cb_hosts" checked onclick="toggleColumn(this)"><label for="cb_hosts">Hosts</label>
|
|
<input type="checkbox" id="cb_divide" checked onclick="toggleColumn(this)"><label for="cb_divide">Divide</label>
|
|
<input type="checkbox" id="cb_join" checked onclick="toggleColumn(this)"><label for="cb_join">Join</label>
|
|
</p>
|
|
</form>
|
|
|
|
<p>Click below to split and join subnets.<br>
|
|
If you wish to save this subnetting for later, bookmark <a href="subnets.html" id="saveLink">this hyperlink</a>.</p>
|
|
|
|
</td>
|
|
<td align="right">
|
|
<a href="https://github.com/davidc/subnets"><img alt="Fork me on GitHub" src="https://github.blog/wp-content/uploads/2008/12/forkme_right_white_ffffff.png" style="right: 0;top: 0;position: absolute;"></a>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
<br>
|
|
<hr noshade color="black" size="1">
|
|
<br>
|
|
|
|
<table class="calc" cellspacing="0" cellpadding="2">
|
|
<thead>
|
|
<tr>
|
|
<th id="subnetHeader">Subnet address</th>
|
|
<th id="netmaskHeader">Netmask</th>
|
|
<th id="rangeHeader">Range of addresses</th>
|
|
<th id="useableHeader">Useable IPs</th>
|
|
<th id="hostsHeader">Hosts</th>
|
|
<th id="divideHeader">Divide</th>
|
|
<th id="joinHeader">Join</th>
|
|
</tr>
|
|
</thead>
|
|
<tbody id="calcbody">
|
|
<!--tr>
|
|
<td>130.94.203.0/24</td>
|
|
<td>130.94.203.0 - 130.94.203.255</td>
|
|
<td>130.94.203.1 - 130.94.203.254 (254)</td>
|
|
<td>Divide</td>
|
|
</tr-->
|
|
</tbody>
|
|
</table>
|
|
|
|
</body>
|
|
</html>
|