//Source: http://stackoverflow.com/questions/4172677/c-enumerate-ip-addresses-in-a-range
public static bool TryParseIpAddressRange(string ipRange, out BlockedIpAddresses blockedIpAddresses)
{
blockedIpAddresses = null;
var ipParts = ipRange.Split('.');
var beginIp = new byte[4];
var endIp = new byte[4];
for (int i = 0; i < 4; i++)
{
string[] rangeParts = ipParts[i].Split('-');
if (rangeParts.Length < 1 || rangeParts.Length > 2)
{
return(false);
}
if (!byte.TryParse(rangeParts[0], out beginIp[i]))
{
return(false);
}
endIp[i] = (rangeParts.Length == 1) ? beginIp[i] : byte.Parse(rangeParts[1]);
}
blockedIpAddresses = new BlockedIpAddresses(beginIp, endIp);
return(true);
}
//Source: http://stackoverflow.com/questions/4172677/c-enumerate-ip-addresses-in-a-range
public static bool TryParseCIDRNotation(string ipRange, out BlockedIpAddresses blockedIpAddresses)
{
blockedIpAddresses = null;
string[] x = ipRange.Split('/');
if (x.Length != 2)
{
return(false);
}
byte bits = byte.Parse(x[1]);
uint ip = 0;
string[] ipParts0 = x[0].Split('.');
for (int i = 0; i < 4; i++)
{
ip = ip << 8;
ip += uint.Parse(ipParts0[i]);
}
byte shiftBits = (byte)(32 - bits);
uint ip1 = (ip >> shiftBits) << shiftBits;
if (ip1 != ip) // Check correct subnet address
{
return(false);
}
uint ip2 = ip1 >> shiftBits;
for (int k = 0; k < shiftBits; k++)
{
ip2 = (ip2 << 1) + 1;
}
var beginIp = new byte[4];
var endIp = new byte[4];
for (int i = 0; i < 4; i++)
{
beginIp[i] = (byte)((ip1 >> (3 - i) * 8) & 255);
endIp[i] = (byte)((ip2 >> (3 - i) * 8) & 255);
}
blockedIpAddresses = new BlockedIpAddresses(beginIp, endIp);
return(true);
}