83 lines
3.1 KiB
C#
83 lines
3.1 KiB
C#
// (c) Copyright Ascensio System SIA 2010-2022
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//
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// This program is a free software product.
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// You can redistribute it and/or modify it under the terms
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// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
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// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
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// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
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// any third-party rights.
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//
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// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
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// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. For details, see
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// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
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//
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// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
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//
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// The interactive user interfaces in modified source and object code versions of the Program must
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// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
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//
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// Pursuant to Section 7(b) of the License you must retain the original Product logo when
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// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
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// trademark law for use of our trademarks.
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//
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// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
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// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
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// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode
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namespace ASC.IPSecurity;
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internal class IPAddressRange
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{
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private readonly AddressFamily _addressFamily;
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private readonly byte[] _lowerBytes;
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private readonly byte[] _upperBytes;
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public IPAddressRange(IPAddress lower, IPAddress upper)
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{
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_addressFamily = lower.AddressFamily;
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_lowerBytes = lower.GetAddressBytes();
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_upperBytes = upper.GetAddressBytes();
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}
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public bool IsInRange(IPAddress address)
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{
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if (address.AddressFamily != _addressFamily)
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{
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return false;
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}
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var addressBytes = address.GetAddressBytes();
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bool lowerBoundary = true, upperBoundary = true;
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for (var i = 0; i < _lowerBytes.Length &&
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(lowerBoundary || upperBoundary); i++)
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{
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var addressByte = addressBytes[i];
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var upperByte = _upperBytes[i];
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var lowerByte = _lowerBytes[i];
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if ((lowerBoundary && addressByte < lowerByte) || (upperBoundary && addressByte > upperByte))
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{
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return false;
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}
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lowerBoundary &= addressByte == lowerByte;
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upperBoundary &= addressByte == upperByte;
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}
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return true;
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}
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public static bool IsInRange(string ipAddress, string CIDRmask)
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{
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var parts = CIDRmask.Split('/');
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var IP_addr = BitConverter.ToInt32(IPAddress.Parse(ipAddress).GetAddressBytes(), 0);
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var CIDR_addr = BitConverter.ToInt32(IPAddress.Parse(parts[0]).GetAddressBytes(), 0);
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var CIDR_mask = IPAddress.HostToNetworkOrder(-1 << (32 - int.Parse(parts[1])));
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return (IP_addr & CIDR_mask) == (CIDR_addr & CIDR_mask);
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}
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}
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