note 9546 deleted from function.ip2long by felipe
| From: | felipe@php.net | Date: | Sat, 29 Dec 2007 19:06:40 +0000 |
| Subject: | note 9546 deleted from function.ip2long by felipe | ||
| References: | 1 | Groups: | php.notes |
| Request: | Send a blank email to php-notes+get-134178@lists.php.net to get a copy of this message | ||
Note Submitter: jna at retina dot net
----
One thing PHP lacks is a way to compare two IP addresses, which I thought might be under this
function, but isn't. Here goes:
function testip($range,$ip) {
$result = 1;
# IP Pattern Matcher
# J.Adams <jna@retina.net>
#
# Matches:
#
# xxx.xxx.xxx.xxx (exact)
# xxx.xxx.xxx.[yyy-zzz] (range)
# xxx.xxx.xxx.xxx/nn (nn = # bits, cisco style -- i.e. /24 = class C)
#
# Does not match:
# xxx.xxx.xxx.xx[yyy-zzz] (range, partial octets not supported)
if (ereg("([0-9]+)\.([0-9]+)\.([0-9]+)\.([0-9]+)/([0-9]+)",$range,$regs)) {
# perform a mask match
$ipl = ip2long($ip);
$rangel = ip2long($regs[1] . "." . $regs[2] . "." . $regs[3] .
"." . $regs[4]);
$maskl = 0;
for ($i = 0; $i< 31; $i++) {
if ($i < $regs[5]-1) {
$maskl = $maskl + pow(2,(30-$i));
}
}
if (($maskl & $rangel) == ($maskl & $ipl)) {
return 1;
} else {
return 0;
}
} else {
# range based
$maskocts = split("\.",$range);
$ipocts = split("\.",$ip);
# perform a range match
for ($i=0; $i<4; $i++) {
if (ereg("\[([0-9]+)\-([0-9]+)\]",$maskocts[$i],$regs)) {
if ( ($ipocts[$i] > $regs[2]) || ($ipocts[$i] < $regs[1])) {
$result = 0;
}
}
else
{
if ($maskocts[$i] <> $ipocts[$i]) {
$result = 0;
}
}
}
}
return $result;
}