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Request #8217 long2ip gives 127.255.255.255 result instead of correct value
Submitted: 2000-12-12 18:43 UTC Modified: 2003-01-18 10:27 UTC
From: christoph at lameter dot com Assigned:
Status: Closed Package: Feature/Change Request
PHP Version: 4.0.3pl1 OS: Linux
Private report: No CVE-ID: None
View Developer Edit
 [2000-12-12 18:43 UTC] christoph at lameter dot com 
Feed the following list to this script and you will see how long2ip screws up. There is an overflow condition it seems:

178519801
1061963075
1070665698
1070668067
2180645450
2180645574
2180645666
2180645722
2180647266
2180648705
2180649062
2180652350
2180676205
2301042637
2554268534
2554278550
2554279006
3232238083
3232238334
3435825182
3435825736
3475085569
3506496261
3508072161
3522432302
3528459286
3528470646
3528471070


<?php

function lng2ip($ip) {
   settype($ip,"double");
   return floor($ip/(256*256*256)) . "." . floor($ip/(256*256))%256 . "." . floor($ip/256)%256 . "." .
}

$fh=fopen("xx","r");
while ($x=fgets($fh,100)) {
  $x=rtrim ($x);
  echo "$x ".long2ip($x)." ".lng2ip($x)."\n";
}

?>

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 [2000-12-13 06:35 UTC] stas@php.net 
Numbers you brought are not valid PHP longs, they don't fit
signed long. So they don't give good result in long2ip. It
might be done with a special hack, but it's not a bug - it's
a lacking feature.
 [2003-01-18 10:27 UTC] moriyoshi@php.net 
Thank you for your bug report. This issue has already been fixed
in the latest released version of PHP, which you can download at 
http://www.php.net/downloads.php
 
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