Chkdomains script

From Freelock Knowledge Base

#!/usr/bin/php -q
<?php
/* Copyright 10/30/2006 freelock computing
 *
 *  chkdomains.php
 * basic site monitoring script
 * sends an email when status is different than previous running of the script
 ***
 * installation instructions
 * create a /var/www/conf directory to store this
 *  /var/www/conf/satus contains the cache result
 *  this must be writable by the user running the job
 *  add a  URL to the $site array for each site to check
 *  set $mailto to appropriate email addresses, comma seporated
 *  schedual the cron job (php command line package required php_cli)
 * 
 *  The status file needs to be writiable by the script ( a user accont
 *  that runs the script)
 * 
 * on your server that is to be checked,  create a textfile called "FILENAME" with your success string, this must match exactly, newlines and whitespace matter.
 ***
 * Testing instructions
 * delete or change the contents of the domain_uptime.txt
 * run the script
 * check the contents of the new domain_uptime.txt file
 * check your email
 *
 ***
 * files, 
 * on each server, uptime.txt
 * on monitoring system
     /var/www/conf/chkdomains.php (this file)
 *   /var/www/conf/status/domain_uptime.txt  conists of 1's and 0's seporated by newlines, this is rewritten every run. 1's represent server being up, 0's represent server being down.
 */

# fully qualified URLS of http servers with a trailing slash
$site[] = "http://yoursite1.com/";
$site[] = "http://yoursite2.org/";
$site[] = "http://yoursite3.net/";

# email address(es) seporated by commas
$mailto = "sys-admin@yourdomain.com,optionaladditional@email.com";

#file to check from servers listed above
define('FILENAME', "uptime.txt"); 

#file contents must match exactly
define('SUCCESS', "success");  

#file to store the status of the last run
define('STATUS_FILE', '/var/www/conf/status/domain_uptime.txt'); #

$out = '';

for ($i=0; $i<count($site); $i++)
{
    $filename = $site[$i] . FILENAME;
    
    if ($fp=@fopen($filename,'r')){
        $err = socket_get_status($fp);
        if ($err['timed_out']) {
            $txt = "$filename timed out\n";
            $status[$i]= 0;
        }
        else
        {
            $text = trim(fread($fp, 2048));
      
        $txt = $filename. ': ' . $text . '(' . ($text==SUCCESS) . ")\n";
            $status[$i]=1;
        }
        fclose($fp);
    } else {
    
        $txt = "$filename not opened\n";
        $status[$i]=0;
    }
 
    $out .= $txt;
}

$changed = false;
if ($oldstatus= @file(STATUS_FILE))
{
    for ($i=0;$i<count($oldstatus)&&!$changed;$i++)
    {
        if ($status[$i]!=trim($oldstatus[$i]))
        {
            $changed = true;
        }
    }
}
else
{
    $changed = true;
}

if ($changed)
    {
        $fp = fopen(STATUS_FILE, 'w');
        for ($i=0;$i<count($status); $i++)
        {
            fwrite($fp, $status[$i] . "\n");
        }
fclose($fp);
mail( $mailto , 'Domain Uptime Report: Status Change', $out);
    }

?>