public static Netmask?GetNetmaskFromString(string Netmask)
{
Netmask Result = new Netmask();
var NetmaskSplit = Netmask.Split(new char[] { '/' }, 2);
if (NetmaskSplit.Length != 2)
{
return(null);
}
var NetmaskSegments = NetmaskSplit[0].Split(new char[] { '.' }, 4);
if (NetmaskSegments.Length != 4)
{
return(null);
}
UInt32 Mask = 0;
if (!UInt32.TryParse(NetmaskSplit[1], out Mask))
{
return(null);
}
UInt32 NetmaskValue = 0;
UInt32 MaskValue = Mask == 0 ? 0 : (~(((UInt32)1 << (int)(32 - Mask)) - 1));
byte TempSegment = 0;
for (int seg = 0; seg < 4; seg++)
{
if (!byte.TryParse(NetmaskSegments[seg], out TempSegment))
{
return(null);
}
NetmaskValue = NetmaskValue << 8;
NetmaskValue |= TempSegment;
}
Result.NetmaskString = Netmask;
Result.MaskBits = Mask;
Result.MaskValue = MaskValue;
Result.MaskedAddress = NetmaskValue & MaskValue;
return(Result);
}
public static Netmask?GetNetmaskFromIPAndGenmask(string IP, string Genmask)
{
Netmask Result = new Netmask();
var IPSegments = IP.Split(new char[] { '.' }, 4);
uint Mask = MaskFromGenmask(Genmask);
UInt32 NetmaskValue = 0;
UInt32 MaskValue = Mask == 32 ? (~(UInt32)0) : (~(((UInt32)1 << (int)(32 - Mask)) - 1));
byte TempSegment = 0;
for (int seg = 0; seg < 4; seg++)
{
if (!byte.TryParse(IPSegments[seg], out TempSegment))
{
return(null);
}
NetmaskValue = NetmaskValue << 8;
NetmaskValue |= TempSegment;
}
Result.MaskedAddress = NetmaskValue & MaskValue;
Result.NetmaskString = string.Format("{0}.{1}.{2}.{3}/{4}",
(Result.MaskedAddress >> 24) & 0xFF,
(Result.MaskedAddress >> 16) & 0xFF,
(Result.MaskedAddress >> 8) & 0xFF,
Result.MaskedAddress & 0xFF,
Mask);
Result.MaskBits = Mask;
Result.MaskValue = MaskValue;
return(Result);
}
public static bool IPMatchesNetmask(UInt32 IPAsInteger, Netmask Netmask)
{
return((IPAsInteger & Netmask.MaskValue) == (Netmask.MaskedAddress & Netmask.MaskValue));
}
