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Linode Kernel version alerting.
<?php
/*
* Linode Kernel Version alerter.
*
* Fetches a list of the available Linode kernels and alerts you if
* your currently running version is out of date.
*
* Crontab: * 23 * * php /path/to/this/script
* @author Gareth Jones
*/
$kernels = new LinodeKernelList();
$thisKernel = php_uname('r');
$thisArch = php_uname('m');
if ("x86_64" == $thisArch) {
$latestKernel = $kernels->getLatest64Bit();
} else {
$latestKernel = $kernels->getLatest32Bit();
}
if (!strstr($thisKernel, 'linode')) {
echo "You don't appear to be running a Linode Kernel: " . $thisKernel . PHP_EOL;
exit(1);
}
if (!strstr($thisKernel, $latestKernel)) {
echo 'Your Kernel appears to be out of date' . PHP_EOL;
echo 'Current: ' . $thisKernel . PHP_EOL;
echo 'Latest: ' . $latestKernel . PHP_EOL;
}
class LinodeKernelList
{
private $kernels;
private $latest32bit;
private $latest64bit;
private $rawFeed;
public function __construct($feedUrl = "http://www.linode.com/kernels/rss.xml")
{
$this->kernels = array();
$this->rawFeed = @file_get_contents($feedUrl);
if ($this->rawFeed == false) {
throw new \Exception('Unable to get the Linode Kernels RSS feed.');
}
$this->parseFeed();
}
public function getLatest32Bit()
{
return $this->latest32bit;
}
public function getLatest64Bit()
{
return $this->latest64bit;
}
public function getAll()
{
return $this->kernels;
}
private function parseFeed()
{
$xml = simplexml_load_string($this->rawFeed);
foreach ($xml->channel->item as $item) {
$title = (string) $item->title;
if (strstr($title, 'Latest 32')) {
$title = $this->parseLatest($title);
$this->latest32bit = $title;
} elseif (strstr($title, 'Latest 64') ) {
$title = $this->parseLatest($title);
$this->latest64bit = $title;
}
if (strstr($title,'x86_64')) {
$this->kernels['64 bit'][] = $title;
} else {
$this->kernels['32 bit'][] = $title;
}
}
}
// Latest kernels are listed as:
// "Latest 32 bit (3.6.5-linode47)"
// "Latest 64 bit (3.6.5-x86_64-linode28)"
private function parseLatest($title)
{
$res = preg_match('/(?<=\()(.+)(?=\))/is', $title, $matches);
return $matches[0];
}
}
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