From 8bc2f0fcd27e74e5f71cf91913cffd094714ac4d Mon Sep 17 00:00:00 2001
From: Adam Amstrong <adama@localhost>
Date: Sat, 4 Feb 2012 17:29:51 +0000
Subject: [PATCH] fix false positive reboots (is engine uptime higher than
 device uptime?) Thanks to Michael Hsu from Media Temple.

git-svn-id: http://www.observium.org/svn/observer/trunk@2856 61d68cd4-352d-0410-923a-c4978735b2b8
---
 includes/polling/system.inc.php | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/includes/polling/system.inc.php b/includes/polling/system.inc.php
index acb1c072b..f990cc080 100755
--- a/includes/polling/system.inc.php
+++ b/includes/polling/system.inc.php
@@ -49,9 +49,15 @@
     $uptime = $secs;
   }
 
+  // Use snmpEngineTime (68 year rollover) to cross-reference for false positives in device rebooting due to sysUpTime rollover issues
+  $snmpEngineTime = (integer)snmp_get($device, "snmpEngineTime.0", "-OUqv", "SNMP-FRAMEWORK-MIB");
+  if (!is_numeric($snmpEngineTime)) {
+    $snmpEngineTime = 0;
+  }
+
   if (is_numeric($uptime))
   {
-    if ($uptime < $device['uptime'])
+    if ($uptime < $device['uptime'] && $uptime >= $snmpEngineTime)
     {
       notify($device,"Device rebooted: " . $device['hostname'],  "Device Rebooted : " . $device['hostname'] . " " . formatUptime($uptime) . " ago.");
       log_event('Device rebooted after '.formatUptime($device['uptime']), $device, 'reboot', $device['uptime']);