39 lines
1.1 KiB
C#
39 lines
1.1 KiB
C#
// <copyright file="IpAddressExtensions.cs" company="MUnique">
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// Licensed under the MIT License. See LICENSE file in the project root for full license information.
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// </copyright>
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namespace MUnique.OpenMU.Network;
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using System.Diagnostics.CodeAnalysis;
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using System.Net;
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/// <summary>
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/// Extensions for <see cref="IPAddress"/>.
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/// </summary>
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public static class IpAddressExtensions
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{
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private static HashSet<IPAddress>? _localIpAddresses;
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/// <summary>
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/// Determines whether the address in on same (this) host.
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/// </summary>
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/// <param name="address">The next server address.</param>
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/// <returns>
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/// <c>true</c> if the specified address is on same host as this machine; otherwise, <c>false</c>.
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/// </returns>
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public static bool IsOnSameHost([NotNullWhen(true)] this IPAddress? address)
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{
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if (address is null)
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{
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return false;
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}
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if (IPAddress.IsLoopback(address))
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{
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return true;
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}
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_localIpAddresses ??= Dns.GetHostAddresses(Dns.GetHostName()).ToHashSet();
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return _localIpAddresses.Contains(address);
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}
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} |