bandwidth.php misses NFS_ETH_MONITOR

[Sebastian Roth]

As we see in what moses posted (https://forums.fogproject.org/topic/6856/replication-has-stopped-after-ugprade) there seams to be an issue with the interface detection in that script. Testing this on my system I find that NFS_ETH_MONITOR on line 7 in bandwidth.php cannot have the correct value as this whole PHP script is not called from within the FOG framework but as URL (like an external call) from dashboardpage.class.php (line 91).

So the whole line simply defaults to ‘eth0’ in most cases because ‘NFS_ETH_MONITOR’ is not defined and ‘dev’ is not sent as request parameter either:

$dev = trim(($_REQUEST['dev'] ? basename(htmlentities($_REQUEST['dev'],ENT_QUOTES,'utf-8')) : (defined('NFS_ETH_MONITOR') ? NFS_ETH_MONITOR : 'eth0')));

As already suggested to Tom I’d vote for a complete rewrite of this PHP file to get rid of executing external tools as well… Proposal coming soon!

[Sebastian Roth]

<?php
function getInterface() {
    $dev = trim($_REQUEST['dev'] ? basename(htmlentities($_REQUEST['dev'],ENT_QUOTES,'utf-8')) : 'eth0');
    $sys_interfaces = array_diff(scandir('/sys/class/net'), array('..', '.'));
    $interfaces = array();
    foreach ($sys_interfaces as $iface) {
        if (trim(file_get_contents(sprintf('/sys/class/net/%s/operstate', $iface))) === 'up') {
            array_push($interfaces, $iface);
        }
    }
    $interface = preg_grep("#$dev#",(array)$interfaces);
    $dev = @array_shift($interface);
    if (!empty($dev)) {
        $rx = trim(file_get_contents(sprintf('/sys/class/net/%s/statistics/rx_bytes', $dev)));
        $tx = trim(file_get_contents(sprintf('/sys/class/net/%s/statistics/tx_bytes', $dev)));
        return array('dev' => $dev,'rx' => $rx,'tx' => $tx);
    }
    else {
        return array('dev' => 'unknown', 'rx' => '0', 'tx' => '0');
    }
}
header('Content-Type: text/event-stream');
echo json_encode(getInterface());
exit;

[Wayne Workman]

/sys/class/net WOW I wish I knew about that directory a long time ago! It appears to be valid for both Ubuntu 15 and Fedora 23 as well!

[Sebastian Roth]

@Wayne-Workman said:

It appears to be valid for both Ubuntu 15 and Fedora 23 as well!

Absolutely!! You can find it within FOS as well… All the systems that use the linux kernel really!

[Tom Elliott]

@Sebastian-Roth Pushed as suggested.