Friday, March 24, 2006
Calling nsupdate from PHP script
First, I should note that this is very situational but hopefully someone can make use of it. The environment at work is mostly Windows machines. There is a Windows DNS server as well which accepts dynamic updates for reverse lookups, among other things. This can be a pain when you are working on various Unix/Linux platforms. I wrote up a very quick web page that uses the nsupdate package (should be available for most platforms) to remove stale reverse lookup entries from the server. Released public domain, a comment here would be appreciated if it helped you at all.
<html>
<head>
<title>Jamie's DNS fixer thingy</title>
</head>
<body>
<P>This tool clears reverse lookup entries for a given IP. Stale reverse lookup
entries can cause problems with non-Windows systems. Entering an IP here submits
a dynamic update request to the DNS server for removal of the entry for that IP.</P>
<form method="POST">
<input name="IP" type="text" value="<?=(!empty($_POST['IP'])) ? $_POST['IP'] : ""?>">
<input name="Submit" type="submit"/>
</form>
<?php
$input = $_POST['IP'];
$valid = preg_match('/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/', $input);
if (isset($_POST['Submit'])) {
if (!$valid) {
?>
<p><?=empty($input) ? "You must specify an IP address." : "$input is not a valid IP address."?></p>
<? } else { // Input validated by regexp
$iparr = split('\.', $input);
$iprev = $iparr[3].'.'.$iparr[2].'.'.$iparr[1].'.'.$iparr[0];
$dnscmd = <<<EOF
update delete {$iprev}.in-addr.arpa
send
exit
EOF;
$nsupdate = popen('/usr/bin/nsupdate', 'w');
fwrite($nsupdate, $dnscmd);
$retval = pclose($nsupdate); // nsupdate doesn't return anything useful when called this way
?>
<p>Submitted removal request for stored DNS record on <?=$input?>.
</p>
<?
} // if(!$valid)
} // if(isset($_POST['Submit']))
?>
</body></html>
# posted by James Tatum @ 1:55 PM 
Comments:
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Hi,
Just to say thanks for this.
I used it as a base to add and remove dns entries.
Just to say thanks for this.
I used it as a base to add and remove dns entries.
# posted by 
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: 6:59 AM
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