public static string ConvertCidrToSubnetmask(int cidr)
{
var bits = string.Empty;
for (var i = 0; i < cidr; i++)
{
bits += "1";
}
return(IPv4Address.ToHumanString(bits.PadRight(32, '0')));
}
public static List <ARPInfo> GetTable()
{
var list = new List <ARPInfo>();
// The number of bytes needed.
var bytesNeeded = 0;
// The result from the API call.
var result = GetIpNetTable(IntPtr.Zero, ref bytesNeeded, false);
// Call the function, expecting an insufficient buffer.
if (result != ERROR_INSUFFICIENT_BUFFER)
{
// Throw an exception.
throw new Win32Exception(result);
}
// Allocate the memory, do it in a try/finally block, to ensure
// that it is released.
var buffer = IntPtr.Zero;
// Try/finally.
try
{
// Allocate the memory.
buffer = Marshal.AllocCoTaskMem(bytesNeeded);
// Make the call again. If it did not succeed, then
// raise an error.
result = GetIpNetTable(buffer, ref bytesNeeded, false);
// If the result is not 0 (no error), then throw an exception.
if (result != 0)
{
// Throw an exception.
throw new Win32Exception(result);
}
// Now we have the buffer, we have to marshal it. We can read
// the first 4 bytes to get the length of the buffer.
var entries = Marshal.ReadInt32(buffer);
// Increment the memory pointer by the size of the int.
var currentBuffer = new IntPtr(buffer.ToInt64() +
Marshal.SizeOf(typeof(int)));
// Allocate an array of entries.
var table = new MIB_IPNETROW[entries];
// Cycle through the entries.
for (var i = 0; i < entries; i++)
{
// Call PtrToStructure, getting the structure information.
table[i] = (MIB_IPNETROW)Marshal.PtrToStructure(new
IntPtr(currentBuffer.ToInt64() + (i * Marshal.SizeOf(typeof(MIB_IPNETROW)))), typeof(MIB_IPNETROW));
}
var virtualMAC = new PhysicalAddress(new byte[] { 0, 0, 0, 0, 0, 0 });
var broadcastMAC = new PhysicalAddress(new byte[] { 255, 255, 255, 255, 255, 255 });
for (var i = 0; i < entries; i++)
{
var row = table[i];
var ipAddress = new IPAddress(BitConverter.GetBytes(row.dwAddr));
var macAddress = new PhysicalAddress(new[] { row.mac0, row.mac1, row.mac2, row.mac3, row.mac4, row.mac5 });
// Filter 0.0.0.0.0.0, 255.255.255.255.255.255
if (!macAddress.Equals(virtualMAC) && !macAddress.Equals(broadcastMAC))
{
list.Add(new ARPInfo(ipAddress, macAddress, ipAddress.IsIPv6Multicast || IPv4Address.IsMulticast(ipAddress)));
}
}
return(list);
}
finally
{
// Release the memory.
FreeMibTable(buffer);
}
}
public static IPAddress[] CreateIPAddressesFromIPRanges(string[] ipRanges, CancellationToken cancellationToken)
{
var bag = new ConcurrentBag <IPAddress>();
var parallelOptions = new ParallelOptions
{
CancellationToken = cancellationToken
};
foreach (var ipOrRange in ipRanges)
{
// Match 192.168.0.1
if (Regex.IsMatch(ipOrRange, RegexHelper.IPv4AddressRegex))
{
bag.Add(IPAddress.Parse(ipOrRange));
continue;
}
// Match 192.168.0.0/24 or 192.168.0.0/255.255.255.0
if (Regex.IsMatch(ipOrRange, RegexHelper.IPv4AddressCidrRegex) || Regex.IsMatch(ipOrRange, RegexHelper.IPv4AddressSubnetmaskRegex))
{
var network = IPNetwork.Parse(ipOrRange);
Parallel.For(IPv4Address.ToInt32(network.Network), IPv4Address.ToInt32(network.Broadcast) + 1, parallelOptions, i =>
{
bag.Add(IPv4Address.FromInt32(i));
parallelOptions.CancellationToken.ThrowIfCancellationRequested();
});
continue;
}
// Match 192.168.0.0 - 192.168.0.100
if (Regex.IsMatch(ipOrRange, RegexHelper.IPv4AddressRangeRegex))
{
var range = ipOrRange.Split('-');
Parallel.For(IPv4Address.ToInt32(IPAddress.Parse(range[0])), IPv4Address.ToInt32(IPAddress.Parse(range[1])) + 1, parallelOptions, i =>
{
bag.Add(IPv4Address.FromInt32(i));
parallelOptions.CancellationToken.ThrowIfCancellationRequested();
});
continue;
}
// Convert 192.168.[50-100,200].1 to 192.168.50.1, 192.168.51.1, 192.168.52.1, {..}, 192.168.200.1
if (!Regex.IsMatch(ipOrRange, RegexHelper.IPv4AddressSpecialRangeRegex))
{
continue;
}
{
var octets = ipOrRange.Split('.');
var list = new List <List <int> >();
// Go through each octet...
foreach (var octet in octets)
{
var innerList = new List <int>();
// Create a range for each octet
if (Regex.IsMatch(octet, RegexHelper.SpecialRangeRegex))
{
foreach (var numberOrRange in octet.Substring(1, octet.Length - 2).Split(','))
{
// 50-100
if (numberOrRange.Contains("-"))
{
var rangeNumbers = numberOrRange.Split('-');
for (var i = int.Parse(rangeNumbers[0]); i < (int.Parse(rangeNumbers[1]) + 1); i++)
{
innerList.Add(i);
}
} // 200
else
{
innerList.Add(int.Parse(numberOrRange));
}
}
}
else
{
innerList.Add(int.Parse(octet));
}
list.Add(innerList);
}
// Build the new ipv4
foreach (var i in list[0])
{
foreach (var j in list[1])
{
foreach (var k in list[2])
{
foreach (var h in list[3])
{
bag.Add(IPAddress.Parse($"{i}.{j}.{k}.{h}"));
}
}
}
}
}
}
return(bag.ToArray());
}
public static int ConvertSubnetmaskToCidr(IPAddress subnetmask)
{
return(string.Join("", IPv4Address.ToBinaryString(subnetmask.ToString()).Replace(".", "").TrimEnd('0')).Length);
}