# Return: TRUE/FALSE
sub IpInSubnet
{
- my $ip = unpack('N', &Socket::inet_aton(shift));
- my $start = unpack('N', &Socket::inet_aton(shift));
- my $mask = unpack('N', &Socket::inet_aton(shift));
- $start &= $mask; # base of subnet...
- my $end = $start + ~$mask;
- return (($ip >= $start) && ($ip <= $end));
+ my $addr = shift;
+ my $network = shift;
+ my $netmask = shift;
+
+ my $addr_num = &Socket::inet_pton(AF_INET,$addr);
+ my $network_num = &Socket::inet_pton(AF_INET,$network);
+ my $netmask_num = &Socket::inet_pton(AF_INET,$netmask);
+
+ # Find start address
+ my $network_start = $network_num & $netmask_num;
+
+ # Find end address
+ my $network_end = $network_start ^ ~$netmask_num;
+
+ return (($addr_num ge $network_start) && ($addr_num le $network_end));
}
#