34 lines
No EOL
1.5 KiB
C#
34 lines
No EOL
1.5 KiB
C#
using System.Net;
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using System.Net.Sockets;
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namespace Iceshrimp.Backend.Core.Extensions;
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public static class IPAddressExtensions
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{
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public static bool IsLoopback(this IPAddress address) => IPAddress.IsLoopback(address);
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public static bool IsLocalIPv6(this IPAddress address) => address.AddressFamily == AddressFamily.InterNetworkV6 &&
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(address.IsIPv6LinkLocal ||
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address.IsIPv6SiteLocal ||
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address.IsIPv6UniqueLocal);
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public static bool IsLocalIPv4(this IPAddress address) => address.AddressFamily == AddressFamily.InterNetwork &&
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IsPrivateIPv4(address.GetAddressBytes());
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private static bool IsPrivateIPv4(byte[] ipv4Bytes)
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{
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return IsLinkLocal() || IsClassA() || IsClassC() || IsClassB();
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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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}
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} |