private static Exception?TryParseStartEndFormat(string str, int separatorPos, out IPAddressRange result)
{
result = None;
var s = str.Substring(0, separatorPos).Trim();
if (!IPAddressUtility.TryParse(s, out var startAddress))
{
return(InvalidStartAddress());
}
s = str.Substring(separatorPos + 1).Trim();
if (!IPAddressUtility.TryParse(s, out var endAddress))
{
return(InvalidEndAddress());
}
var addressFamily = startAddress.AddressFamily;
if (endAddress.AddressFamily != addressFamily)
{
return(MismatchedStartEndFamily());
}
var start = new IPAddressValue(startAddress);
var end = new IPAddressValue(endAddress);
if (end.CompareTo(start) < 0)
{
return(EndLowerThanStart());
}
result = new IPAddressRange(start, end, addressFamily == AddressFamily.InterNetworkV6, 0);
return(null);
}
private static Exception?TryParseSingleAddressFormat(string str, out IPAddressRange result)
{
result = None;
if (!IPAddressUtility.TryParse(str, out var address))
{
return(InvalidIPAddress());
}
var addressValue = new IPAddressValue(address);
result = new IPAddressRange(addressValue, addressValue, address.AddressFamily == AddressFamily.InterNetworkV6, 0);
return(null);
}
private static Exception?TryParseCidrOrAddressNetmaskFormat(string str, int separatorPos, out IPAddressRange result)
{
result = None;
var s = str.Substring(0, separatorPos).Trim();
if (!IPAddressUtility.TryParse(s, out var address))
{
return(InvalidIPAddress());
}
var addressValue = new IPAddressValue(address);
s = str.Substring(separatorPos + 1).Trim();
if (byte.TryParse(s, NumberStyles.None, CultureInfo.InvariantCulture, out var prefixLength))
{
var maxPrefixLength = address.AddressFamily == AddressFamily.InterNetworkV6 ? 128 : 32;
if (prefixLength < 1 || prefixLength > maxPrefixLength)
{
return(InvalidPrefixLength());
}
if (!addressValue.IsStartOfSubnet(prefixLength))
{
return(InvalidSubnetBaseAddress());
}
result = new IPAddressRange(addressValue, addressValue.GetEndOfSubnet(prefixLength), address.AddressFamily == AddressFamily.InterNetworkV6, prefixLength);
return(null);
}
// Only accept a netmask for IPv4
if (address.AddressFamily != AddressFamily.InterNetwork)
{
return(InvalidPrefixLength());
}
if (!IPAddressUtility.TryParse(s, out var netmask))
{
return(InvalidPrefixLengthOrNetmask());
}
var addressFamily = address.AddressFamily;
if (netmask.AddressFamily != addressFamily)
{
return(MismatchedNetmaskAddressFamily());
}
var netmaskBytes = netmask.GetAddressBytes();
if (!TryNetmaskToCidrPrefixLength(netmaskBytes, out prefixLength))
{
return(InvalidNetmask());
}
if (!addressValue.IsStartOfSubnet(prefixLength))
{
return(InvalidSubnetBaseAddress());
}
result = new IPAddressRange(addressValue, addressValue.GetEndOfSubnet(prefixLength), false, prefixLength);
return(null);
}
