public int GetPrefixLength()
{
byte[] byteBegin = Begin.GetAddressBytes();
byte[] byteEnd = End.GetAddressBytes();
// Handle single IP
if (Begin.Equals(End))
{
return(byteBegin.Length * 8);
}
int length = byteBegin.Length * 8;
for (int i = 0; i < length; i++)
{
byte[] mask = Bits.GetBitMask(byteBegin.Length, i);
if (new IPAddress(Bits.And(byteBegin, mask)).Equals(Begin))
{
if (new IPAddress(Bits.Or(byteBegin, Bits.Not(mask))).Equals(End))
{
return(i);
}
}
}
throw new FormatException(string.Format("{0} is not a CIDR Subnet", ToString()));
}
/// <summary>
/// Create a new range from a begin and end address.
/// Throws an exception if Begin comes after End, or the
/// addresses are not in the same family.
/// </summary>
public IPAddressRange(IPAddress begin, IPAddress end)
{
if (begin == null)
{
throw new ArgumentNullException("begin");
}
if (end == null)
{
throw new ArgumentNullException("end");
}
Begin = begin;
End = end;
if (Begin.AddressFamily != End.AddressFamily)
{
throw new ArgumentException("Elements must be of the same address family", "beginEnd");
}
var beginBytes = Begin.GetAddressBytes();
var endBytes = End.GetAddressBytes();
if (!Bits.LE(endBytes, beginBytes))
{
throw new ArgumentException("Begin must be smaller than the End", "beginEnd");
}
}
public bool Contains
(
IPAddress address
)
{
byte[] bytes = address.GetAddressBytes();
return(Bits.GE(Begin.GetAddressBytes(), bytes) &&
Bits.LE(End.GetAddressBytes(), bytes));
}
public IEnumerator <IPAddress> GetEnumerator()
{
var first = Begin.GetAddressBytes();
var last = End.GetAddressBytes();
for (var ip = first; Bits.LtECore(ip, last); ip = Bits.Increment(ip))
{
yield return(new IPAddress(ip));
}
}
public bool Contains(IPAddress ipaddress)
{
if (ipaddress.AddressFamily != Begin.AddressFamily)
{
return(false);
}
var adrBytes = ipaddress.GetAddressBytes();
return(Bits.GE(Begin.GetAddressBytes(), adrBytes) && Bits.LE(End.GetAddressBytes(), adrBytes));
}
/// <summary>
/// Create a new range from a begin and end address.
/// Throws an exception if Begin comes after End, or the
/// addresses are not in the same family.
/// </summary>
public IPAddressRange(IPAddress begin, IPAddress end)
{
Begin = begin;
End = end;
if (!IsInSameAddressFamily(Begin, End))
{
throw new ArgumentException("Elements must be of the same address family", "beginEnd");
}
var beginBytes = Begin.GetAddressBytes();
var endBytes = End.GetAddressBytes();
if (!Bits.LE(endBytes, beginBytes))
{
throw new ArgumentException("Begin must be smaller than the End", "beginEnd");
}
}