using System;

using System.Collections.Generic;

using System.Net;

namespace NETworkManager.Utilities;

public static class IPAddressHelper

{

/// <summary>

/// Test if an IP address is a private address.

/// </summary>

/// <param name="ipAddress">IP address.</param>

/// <returns>True if the IP address is a private address, otherwise false.</returns>

public static bool IsPrivateIPAddress(IPAddress ipAddress)

{

var addressBytes = ipAddress.GetAddressBytes();

switch (addressBytes.Length)

{

// Check for IPv4 private addresses

case 4 when addressBytes[0] == 10

|| (addressBytes[0] == 172 && addressBytes[1] >= 16 && addressBytes[1] <= 31)

|| (addressBytes[0] == 192 && addressBytes[1] == 168):

// Check for IPv6 unique local addresses (ULA)

case 16 when addressBytes[0] == 0xFC || addressBytes[0] == 0xFD:

return true;

default:

return false;

}

}

/// <summary>

/// Compare two IP addresses.

/// </summary>

/// <param name="x">First IP address.</param>

/// <param name="y">Second IP address.</param>

/// <returns>0 if the IP addresses are equal, otherwise a negative or positive value.</returns>

public static int CompareIPAddresses(IPAddress x, IPAddress y)

{

return ByteHelper.Compare(x.GetAddressBytes(), y.GetAddressBytes());

}

}