Added IPAddress.Increment/Decrement; Added ParseNetwork, ExpandNetwork

AMWD.Common/Utilities/NetworkHelper.cs

@@ -4,6 +4,7 @@ using System.Linq;
 using System.Net;
 using System.Net.NetworkInformation;
 using System.Net.Sockets;
+using Microsoft.AspNetCore.HttpOverrides;
 
 namespace AMWD.Common.Utilities
 {
@@ -77,6 +78,66 @@ namespace AMWD.Common.Utilities
 			}
 		}
 
+		/// <summary>
+		/// Parses a CIDR network definition.
+		/// </summary>
+		/// <param name="network">The network in CIDR.</param>
+		/// <returns>The <see cref="IPNetwork"/> or <c>null</c>.</returns>
+		public static IPNetwork ParseNetwork(string network)
+		{
+			TryParseNetwork(network, out var ipNetwork);
+			return ipNetwork;
+		}
+
+		/// <summary>
+		/// Tries to parse a CIDR network definition.
+		/// </summary>
+		/// <param name="network">The network in CIDR.</param>
+		/// <param name="ipNetwork">The parsed <see cref="IPNetwork"/>.</param>
+		/// <returns><c>true</c> on success, otherwise <c>false</c>.</returns>
+		public static bool TryParseNetwork(string network, out IPNetwork ipNetwork)
+		{
+			try
+			{
+				string[] parts = network.Split('/');
+				if (parts.Length != 2)
+					throw new ArgumentException($"Invalid network type");
+
+				var prefix = IPAddress.Parse(parts.First());
+				int prefixLength = int.Parse(parts.Last());
+
+				ipNetwork = new IPNetwork(prefix, prefixLength);
+				return true;
+			}
+			catch
+			{
+				ipNetwork = null;
+				return false;
+			}
+		}
+
+		/// <summary>
+		/// Uses the <see cref="IPNetwork"/> and expands the whole subnet.
+		/// </summary>
+		/// <remarks>
+		/// The network identifier and the broadcast address are included in the response list.
+		/// </remarks>
+		/// <param name="network">The <see cref="IPNetwork"/> to expand.</param>
+		/// <returns>A list with all valid <see cref="IPAddress"/>es.</returns>
+		public static List<IPAddress> ExpandNetwork(this IPNetwork network)
+		{
+			var list = new List<IPAddress>();
+
+			var ipAddress = network.Prefix;
+			while (network.Contains(ipAddress))
+			{
+				list.Add(ipAddress);
+				ipAddress = ipAddress.Increment();
+			}
+
+			return list;
+		}
+
 		private static IPAddress ResolveIpAddress(string address, AddressFamily addressFamily)
 		{
 			if (IPAddress.TryParse(address, out var ipAddress))