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copied!<p>I have a script i use that checks an IP address stored within my hosts.allow file against what IP is mapped to my dyndns hostname so i can log into my servers once i've synced my current IP to that hostname. For some reason though the script seems to cause really intermittent issues.</p> <p>within my hosts.allow file i have a section like this:</p> <pre><code>#SOme.gotdns.com sshd : 192.168.0.1 #EOme.gotdns.com #SOme2.gotdns.com sshd : 192.168.0.2 #EOme2.gotdns.com </code></pre> <p>I have a script running on a cron (every minute) that looks like this:</p> <pre><code>#!/usr/bin/php <?php $hosts = array('me.gotdns.com','me2.gotdns.com'); foreach($hosts as $host) { $ip = gethostbyname($host); $replaceWith = "#SO".$host."\nsshd : ".$ip."\n#EO".$host; $filename = '/etc/hosts.allow'; $handle = fopen($filename,'r'); $contents = fread($handle, filesize($filename)); fclose($handle); if (preg_match('/#SO'.$host.'(.*?)#EO'.$host.'/si', $contents, $regs)) { $result = $regs[0]; } if($result != $replaceWith) { $newcontents = str_replace($result,$replaceWith,$contents); $handle = fopen($filename,'w'); if (fwrite($handle, $newcontents) === FALSE) { } fclose($handle); } } ?> </code></pre> <p>The problem i have is that intermittently characters are being dropped (i assume during the replace) that causes future updates to fail as it inserts something like:</p> <pre><code>#SOme.gotdns.com sshd : 192.168.0.1 #EOme.gotdn </code></pre> <p><em>note the missing "s.com"</em></p> <p>This of course means i lose access to the server, any ideas why this would be happening?</p> <p>Thanks.</p>

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