From ba5850fd6d529ea37f32f79da0a9979349b9dc27 Mon Sep 17 00:00:00 2001
From: Jack-Benny Persson <jack-benny@cyberinfo.se>
Date: Fri, 15 Aug 2014 20:47:15 +0200
Subject: [PATCH] Initial commit

---
 failover.php | 117 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 117 insertions(+)
 create mode 100644 failover.php

diff --git a/failover.php b/failover.php
new file mode 100644
index 0000000..ab4a85e
--- /dev/null
+++ b/failover.php
@@ -0,0 +1,117 @@
+<?php
+/*
+    Copyright (C) 2014 Jack-Benny Persson <jack-benny@cyberinfo.se>
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+*/
+
+/*
+    Simple script to turn on/off Nagios notification/checks etc for use with
+    Nagios failover hosts.
+    Default is to turn on/off notifications.
+    Version 0.1
+*/
+
+// Variables to set for your environment
+$remoteHost = "testlab.lab";
+$checkCmd = "/usr/lib/nagios/plugins/check_nrpe -H $remoteHost -c check_nagios";
+$checkTmpDir = "/tank/home/jake/failover";
+$checkTmpFile = "check_file";
+$maxCheckFileAge = "1200";
+$enableCmd = "/usr/share/nagios3/plugins/eventhandlers/enable_notifications";
+$disableCmd = "/usr/share/nagios3/plugins/eventhandlers/disable_notifications";
+
+// Run the command to check if the remote Nagios is up
+if ((runCmd($checkCmd)) == 0)
+{
+    // If it's up, then update the modify time of the temp file
+    updateFile($checkTmpDir . "/" . $checkTmpFile);
+    // Then run the "disable" command(s) to stop the local Nagios notifications
+    if ((runCmd($disableCmd)) != 0)
+    {
+        print "Couldn't execute $disableCmd\n";
+        exit(1);
+    }
+    else
+    {
+        // If the above command executed successfully, then just quit
+        exit(0);
+    }
+}
+
+// If the remote Nagios was NOT up and running, execute the code here
+else
+{
+    // Start with if the age of the temp file has exceeded $maxCheckFileAge
+    if ((checkAge($checkTmpDir . "/" . $checkTmpFile, $maxCheckFileAge)) == 1)
+    {
+        // If it has, enable the local Nagios and check if that command did run
+        if ((runCmd($enableCmd)) == 0)
+        {
+            // If we were successful in enabling the local Nagios, then quit
+            exit(0);
+        }
+        else
+        {
+            // If we couln't execute the local Nagios, issue a message about it
+            print "Couldn't execute $enableCmd\n";
+            exit(1);
+        }
+    }
+}
+
+// All of the functions below
+
+// Generic function to execute commands on the system
+function runCmd($cmd)
+{
+    exec($cmd . " 2> /dev/null", $cmdOutput, $cmdReturn);
+    return $cmdReturn;
+}
+
+// Function to touch (update file modify date) of the temp check file
+function updateFile($file)
+{
+    if ((touch ($file)) === false)
+    {
+        print "Couldn't write file $file\n";
+        exit(1);
+    }
+}
+
+// Function to check the age of the temp check file.
+// Return 0 if the file age is within acceptable age (<$maxAge) and 1 otherwise
+function checkAge($file, $maxAge)
+{
+    if (file_exists($file))
+    {
+        if (time() - filemtime($file) > $maxAge)
+        {
+            return 1;
+        }
+        else
+        {
+            return 0;
+        }
+    }
+    else
+    {
+        // Print an error message if the file does not exist
+        print "File $file does not exists\n";
+        exit(1);
+    }
+}
+
+?>