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using System.Net;
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using System.Net.Sockets;
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namespace NzbDrone.Common.Extensions
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{
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public static class IPAddressExtensions
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{
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public static bool IsLocalAddress(this IPAddress ipAddress)
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{
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// Map back to IPv4 if mapped to IPv6, for example "::ffff:1.2.3.4" to "1.2.3.4".
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if (ipAddress.IsIPv4MappedToIPv6)
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{
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ipAddress = ipAddress.MapToIPv4();
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}
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// Checks loopback ranges for both IPv4 and IPv6.
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if (IPAddress.IsLoopback(ipAddress))
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{
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return true;
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}
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// IPv4
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if (ipAddress.AddressFamily == AddressFamily.InterNetwork)
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{
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return IsLocalIPv4(ipAddress.GetAddressBytes());
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}
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// IPv6
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if (ipAddress.AddressFamily == AddressFamily.InterNetworkV6)
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{
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return ipAddress.IsIPv6LinkLocal ||
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ipAddress.IsIPv6UniqueLocal ||
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ipAddress.IsIPv6SiteLocal;
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}
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return false;
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}
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private static bool IsLocalIPv4(byte[] ipv4Bytes)
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{
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// Link local (no IP assigned by DHCP): 169.254.0.0 to 169.254.255.255 (169.254.0.0/16)
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bool IsLinkLocal() => ipv4Bytes[0] == 169 && ipv4Bytes[1] == 254;
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// Class A private range: 10.0.0.0 – 10.255.255.255 (10.0.0.0/8)
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bool IsClassA() => ipv4Bytes[0] == 10;
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// Class B private range: 172.16.0.0 – 172.31.255.255 (172.16.0.0/12)
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bool IsClassB() => ipv4Bytes[0] == 172 && ipv4Bytes[1] >= 16 && ipv4Bytes[1] <= 31;
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// Class C private range: 192.168.0.0 – 192.168.255.255 (192.168.0.0/16)
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bool IsClassC() => ipv4Bytes[0] == 192 && ipv4Bytes[1] == 168;
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return IsLinkLocal() || IsClassA() || IsClassC() || IsClassB();
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}
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}
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}
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