wasSharpNET

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/Network/IPAddressExtensions.cs
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///////////////////////////////////////////////////////////////////////////
// Copyright (C) Wizardry and Steamworks 2016 - License: GNU GPLv3 //
// Please see: http://www.gnu.org/licenses/gpl.html for legal details, //
// rights of fair usage, the disclaimer and warranty conditions. //
///////////////////////////////////////////////////////////////////////////
 
using System;
using System.Net;
 
namespace wasSharpNET.Network
{
/// <summary>
/// IPAddress extensions.
/// </summary>
/// <remarks>https://blogs.msdn.microsoft.com/knom/2008/12/31/ip-address-calculations-with-c-subnetmasks-networks/</remarks>
public static class IPAddressExtensions
{
public static IPAddress GetBroadcastAddress(this IPAddress address, IPAddress subnetMask)
{
var ipAdressBytes = address.GetAddressBytes();
var subnetMaskBytes = subnetMask.GetAddressBytes();
 
if (ipAdressBytes.Length != subnetMaskBytes.Length)
throw new ArgumentException("Lengths of IP address and subnet mask do not match.");
 
var broadcastAddress = new byte[ipAdressBytes.Length];
for (var i = 0; i < broadcastAddress.Length; i++)
{
broadcastAddress[i] = (byte) (ipAdressBytes[i] | (subnetMaskBytes[i] ^ 255));
}
return new IPAddress(broadcastAddress);
}
 
public static IPAddress GetNetworkAddress(this IPAddress address, IPAddress subnetMask)
{
var ipAdressBytes = address.GetAddressBytes();
var subnetMaskBytes = subnetMask.GetAddressBytes();
 
if (ipAdressBytes.Length != subnetMaskBytes.Length)
throw new ArgumentException("Lengths of IP address and subnet mask do not match.");
 
var broadcastAddress = new byte[ipAdressBytes.Length];
for (var i = 0; i < broadcastAddress.Length; i++)
{
broadcastAddress[i] = (byte) (ipAdressBytes[i] & subnetMaskBytes[i]);
}
return new IPAddress(broadcastAddress);
}
 
public static bool IsInSameSubnet(this IPAddress address2, IPAddress address, IPAddress subnetMask)
{
var network1 = address.GetNetworkAddress(subnetMask);
var network2 = address2.GetNetworkAddress(subnetMask);
 
return network1.Equals(network2);
}
}
}