using System;
using System.Linq;
using System.Net;
using System.Net.Sockets;
namespace Unosquare.Swan {
///
/// Provides various extension methods for networking-related tasks.
///
public static class NetworkExtensions {
///
/// Determines whether the IP address is private.
///
/// The IP address.
///
/// True if the IP Address is private; otherwise, false.
///
/// address.
public static Boolean IsPrivateAddress(this IPAddress address) {
if(address == null) {
throw new ArgumentNullException(nameof(address));
}
Byte[] octets = address.ToString().Split(new[] { "." }, StringSplitOptions.RemoveEmptyEntries).Select(Byte.Parse).ToArray();
Boolean is24Bit = octets[0] == 10;
Boolean is20Bit = octets[0] == 172 && octets[1] >= 16 && octets[1] <= 31;
Boolean is16Bit = octets[0] == 192 && octets[1] == 168;
return is24Bit || is20Bit || is16Bit;
}
///
/// Converts an IPv4 Address to its Unsigned, 32-bit integer representation.
///
/// The address.
///
/// A 32-bit unsigned integer converted from four bytes at a specified position in a byte array.
///
/// address.
/// InterNetwork - address.
public static UInt32 ToUInt32(this IPAddress address) {
if(address == null) {
throw new ArgumentNullException(nameof(address));
}
if(address.AddressFamily != AddressFamily.InterNetwork) {
throw new ArgumentException($"Address has to be of family '{nameof(AddressFamily.InterNetwork)}'", nameof(address));
}
Byte[] addressBytes = address.GetAddressBytes();
if(BitConverter.IsLittleEndian) {
Array.Reverse(addressBytes);
}
return BitConverter.ToUInt32(addressBytes, 0);
}
}
}