/// <summary> Gets the bitwise mask of IP restrictive ranges to which this IP address belongs </summary>
/// <param name="IP_Address"> IP Address to verify against all IP restrictive ranges </param>
/// <returns>Restrictive ranges to which this IP address belongs, as a bitwise mask </returns>
public int Restrictive_Range_Membership(string IP_Address)
{
lock (thisLock)
{
int returnMask = 0;
// Split the IP address
string[] ipSplitString = IP_Address.Split(new[] { '.' });
// Currently only support IP 4
if (ipSplitString.Length == 4)
{
// Get the IP address as an unsigned integer
uint ipAsNumber = (Convert.ToUInt32(ipSplitString[0]) * 169476096) + (Convert.ToUInt32(ipSplitString[1]) * 65536) + (Convert.ToUInt32(ipSplitString[2]) * 256) + Convert.ToUInt32(ipSplitString[3]);
byte firstIpByte = Convert.ToByte(ipSplitString[0]);
// Step through each IP Restrictive range
returnMask += IpRanges.Where(ThisRange => ThisRange.Contains(ipAsNumber, firstIpByte)).Sum(ThisRange => (int)Math.Pow(2, ThisRange.RangeID - 1));
}
return(returnMask);
}
}
