I've written (well cobbled together from other people's code) a very simple uptime monitor for our servers - it's just an ICMP (ping) monitor and it works very well for our limited amount of servers (20 or so), and very fast. Here's the code (the actual ping test functions I think are based on Birk Jensen's work ( http://birk-jensen.dk/2010/09/php-ping/ ), and I've just utilised his functions to display a green circle PNG when everything is up and red ones for each server that's down (if any).
<html>
<head>
<style type='text/css'>
*{
font-family:verdana,tahoma,arial;
font-size:17px;
}
.light{width:30px;}
h1{
font-size:25px;
}
</style>
<meta http-equiv="refresh" content="30">
</head>
<body>
<?php
$time1=date('H:i:s');
echo "Last Refresh Time = $time1<br/><hr/>";
error_reporting(0);
/*-----------------------------------------------------------------------------------------*/
// Checksum calculation function
function icmpChecksum($data)
{
if (strlen($data)%2)
$data .= "\x00";
$bit = unpack('n*', $data);
$sum = array_sum($bit);
while ($sum >> 16)
$sum = ($sum >> 16) + ($sum & 0xffff);
return pack('n*', ~$sum);
}
/*-----------------------------------------------------------------------------------------*/
function PingTry1($pingaddress){
// Making the package
$type= "\x08";
$code= "\x00";
$checksum= "\x00\x00";
$identifier = "\x00\x00";
$seqNumber = "\x00\x00";
$data= "testing123";
$package = $type.$code.$checksum.$identifier.$seqNumber.$data;
$checksum = icmpChecksum($package); // Calculate the checksum
$package = $type.$code.$checksum.$identifier.$seqNumber.$data;
// And off to the sockets
$socket = socket_create(AF_INET, SOCK_RAW, 1);
socket_set_option ( $socket, SOL_SOCKET, SO_RCVTIMEO, array("sec"=>1, "usec"=>0) );
socket_connect($socket, $pingaddress, null);
$startTime = microtime(true);
socket_send($socket, $package, strLen($package), 0);
if (socket_read($socket, 255)) {
return true;
}
else{
return false;
}
socket_close($socket);
}
/*-----------------------------------------------------------------------------------------*/
function DoTheCheck($name,$ip){
global $errors;
global $j;
if (PingTry1($ip)==1){
//do nothing
}else{
$j++;
$errors[$j] = "$name --> $ip";
}
}
/*-----------------------------------------------------------------------------------------*/
//READ IN THE INI FILE INTO $filedata Array
$myFile1="hosts.ini";
$filehandle1 = fopen($myFile1, 'r') or die("Couldn't open file [$myFile1]");
$number1=count(file($myFile1));;
$filedata = fread($filehandle1, filesize($myFile1));
fclose($filehandle1);
// Create an array with each line of the file
$array1 = explode("
", $filedata);
unset($filedata); //free up a bit of memory
foreach ($array1 as &$line) { // step through the array, line by line
if (!empty($line)){
list ($name,$ip)=split(",",$line);
DoTheCheck($name,$ip);
}
}
if ($errors){
echo 'The Following Hosts are down - <br/><br/><table>';
foreach ($errors as &$value) {
$k++;
echo '<tr><td><img class="light" src="red.png" /></td><td>'.$errors[$k].'</td></tr>';
}
echo '</tr></table>';
}
else{echo '<img class="light" src="green.png" /><h1>ALL IPS ARE UP!</h1>';}
?>
</body>
</html>
The code above works great for servers but it doesn't seem to work at all for Cisco switches - probably something to do with the way it does its 'ping' as such.
I haven't done any work on this script in ages because of college commitments etc but I've gone back to doing as much google research as I can, but admittedly I'm a level 2 or 3 PHP n00b at best. Today I found a couple of solutions that work for switches, but they have 5 or 6 second timeout periods, which is unacceptable as I want the system to loop as much as possible and as cleanly as possible, and log downtime for graphing later on.
For Example - I've tried this:
function ping($host, $timeout = 1) {
/* ICMP ping packet with a pre-calculated checksum */
$package = "\x08\x00\x7d\x4b\x00\x00\x00\x00PingHost";
$socket = socket_create(AF_INET, SOCK_RAW, 1);
socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array('sec' => $timeout, 'usec' => 0));
socket_connect($socket, $host, null);
$ts = microtime(true);
socket_send($socket, $package, strLen($package), 0);
if (socket_read($socket, 255))
$result = microtime(true) - $ts;
else $result = false;
socket_close($socket);
return $result;
}
and also this:
$url = '192.168.1.1';
$socket = ( bool )false;
$error = ( bool )false;
$socket = @fsockopen( $url, 23, $errno, $errstr, 1 ) or $error = ( bool )true;
if ( ( $socket ) && ( !$error ) )
{
echo "bound";
/* socket is bound - do something */
}
else
{
echo "not bound , [$errstr]";
/* socket is dead - errors are in $errno & $errstr */
}
if ($socket)fclose($socket);
And they both seem to work when the host is online, but if I give it an IP that doesn't exist (for testing, as if host was offline), it takes about 5 or more seconds to time out on a single IP, which is just too slow for my needs.
Would it be possible to do this using pcntl_fork or even curl with multi-threading ? or multiple 'exec' calls or AJAX even (I'm willing to try anything at this stage)
or some sort of Data Layer (layer 2) Mac scanning code would be great either - I don't expect anyone to write the full code, but I'm sure somebody that has done this sort of thing before would have a good idea of the pitfalls and how to get around them.
So in summary - a simple and easy fix would be nice ( I'll Keep Dreaming :-D ) but any help or advice at all is much appreciated.
EDIT - after some advice to try Net_Ping in PEAR I've got the following code:
<?php
$time1=date('H:i:s');
echo "Last Refresh Time = $time1<br/><hr/>";
//not sure if still needed - error_reporting(0);
require_once "Net/Ping.php";
$ping = Net_Ping::factory();
$ping->setArgs(array('count' => 2, 'ttl' => 50, 'timeout' => 1));
/*---------------------------------------------------------------------*/
function DoPing($ip)
{
global $ping;
$results = $ping->ping($ip);
if ($results->_loss==0) {return true;}else{return false;}
}
/*---------------------------------------------------------------------------------*/
function DoTheCheck($name,$ip){
global $errors;
global $j;
if (DoPing($ip)==1){
//do nothing
}else{
$j++;
$errors[$j] = "$name --> $ip";
}
}
/*-----------------------------------------------------------------------------------*/
//READ IN THE INI FILE INTO $filedata Array
$myFile1="hosts.ini";
$filehandle1 = fopen($myFile1, 'r') or die("Couldn't open file [$myFile1]");
$number1=count(file($myFile1));;
$filedata = fread($filehandle1, filesize($myFile1));
fclose($filehandle1);
// Create an array with each line of the file
$array1 = explode("
", $filedata);
unset($filedata); //free up a bit of memory
foreach ($array1 as &$line) { // step through the array, line by line
if ( (!empty($line)) && (!strstr($line,'##')) ) {
list ($name,$ip)=split(",",$line);
DoTheCheck($name,$ip);
}
}
if ($errors){
echo 'The Following Hosts are down - <br/><br/><table>';
foreach ($errors as &$value) {
$k++;
echo '<tr><td><img class="light" src="red.png" /></td><td>'.$errors[$k].'</td></tr>';
}
echo '</tr></table>';
}
else{echo '<img class="light" src="green.png" /><h1>ALL IPS ARE UP!</h1>';}
?>
but that is too slow... takes about a minute or two to check about 20 servers and 10 switches. I need to add about 100 switches so it's only going to get slower. There must be a better way to do this. Again, any help is always very much appreciated. I will probably try Munin but realistically I need something I can integrate into my Company's Intranet (PHP).
