diff options
Diffstat (limited to 'etc/inc/util.inc')
| -rw-r--r-- | etc/inc/util.inc | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/etc/inc/util.inc b/etc/inc/util.inc index 434862d..3660572 100644 --- a/etc/inc/util.inc +++ b/etc/inc/util.inc @@ -1048,6 +1048,43 @@ function alias_expand_urltable($name) { return null; } +function subnet_size ($subnet) { + if (is_subnetv4($subnet)) { + list ($ip, $bits) = explode("/", $subnet); + return round(exp(log(2) * (32 - $bits))); + } + else if (is_subnetv6($subnet)) { + list ($ip, $bits) = explode("/", $subnet); + return round(exp(log(2) * (128 - $bits))); + } + else { + return 0; + } +} + +function subnet_expand ($subnet) { + if (is_subnetv4($subnet)) { + return subnetv4_expand($subnet); + } else if (is_subnetv6($subnet)) { + return subnetv6_expand($subnet); + } else { + return $subnet; + } +} + +function subnetv4_expand ($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 $result; +} + /* find out whether two subnets overlap */ function check_subnets_overlap($subnet1, $bits1, $subnet2, $bits2) { |
