Iceshrimp.NET/Iceshrimp.Backend/Core/Extensions/IPAddressExtensions.cs

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using System.Net;
using System.Net.Sockets;
namespace Iceshrimp.Backend.Core.Extensions;
public static class IPAddressExtensions
{
public static bool IsLoopback(this IPAddress address) => IPAddress.IsLoopback(address);
public static bool IsLocalIPv6(this IPAddress address) => address.AddressFamily == AddressFamily.InterNetworkV6 &&
(address.IsIPv6LinkLocal ||
address.IsIPv6SiteLocal ||
address.IsIPv6UniqueLocal);
public static bool IsLocalIPv4(this IPAddress address) => address.AddressFamily == AddressFamily.InterNetwork &&
IsPrivateIPv4(address.GetAddressBytes());
private static bool IsPrivateIPv4(byte[] ipv4Bytes)
{
return IsLinkLocal() || IsClassA() || IsClassC() || IsClassB();
// Link local (no IP assigned by DHCP): 169.254.0.0 to 169.254.255.255 (169.254.0.0/16)
bool IsLinkLocal() => ipv4Bytes[0] == 169 && ipv4Bytes[1] == 254;
// Class A private range: 10.0.0.0 10.255.255.255 (10.0.0.0/8)
bool IsClassA() => ipv4Bytes[0] == 10;
// Class B private range: 172.16.0.0 172.31.255.255 (172.16.0.0/12)
bool IsClassB() => ipv4Bytes[0] == 172 && ipv4Bytes[1] >= 16 && ipv4Bytes[1] <= 31;
// Class C private range: 192.168.0.0 192.168.255.255 (192.168.0.0/16)
bool IsClassC() => ipv4Bytes[0] == 192 && ipv4Bytes[1] == 168;
}
}