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bring back subnetv4_expand function used by pfblockerng

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This commit is contained in:
Chris Buechler 2016-06-25 01:34:05 -05:00
parent e6ddb55ef3
commit 2208be8b2d
1 changed files with 14 additions and 0 deletions
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14
src/etc/inc/util.inc
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@ -877,6 +877,20 @@ function subnet_size_by_netmask($iptype, $bits, $exact=false) {
}
}
/* function used by pfblockerng */
function subnetv4_expand($subnet) {
$result = array();
list ($ip, $bits) = explode("/", $subnet);
$net = ip2long($ip);
$mask = (0xffffffff << (32 - $bits));
$net &= $mask;
$size = round(exp(log(2) * (32 - $bits)));
for ($i = 0; $i < $size; $i += 1) {
$result[] = long2ip($net | $i);
}
return $result;
}
/* find out whether two IPv4/IPv6 CIDR subnets overlap.
Note: CIDR overlap implies one is identical or included so largest sn will be the same */
function check_subnets_overlap($subnet1, $bits1, $subnet2, $bits2) {