SystemUnicastIPAddressInformation.cs

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using System.Net.Sockets;
using System.Runtime.InteropServices;
 
namespace System.Net.NetworkInformation;
 
internal sealed class SystemUnicastIPAddressInformation : UnicastIPAddressInformation
{
    private readonly long _dhcpLeaseLifetime;
 
    private readonly SystemIPAddressInformation _innerInfo;
 
    private readonly IPAddress _ipv4Mask;
 
    private readonly PrefixOrigin _prefixOrigin;
 
    private readonly SuffixOrigin _suffixOrigin;
 
    private readonly DuplicateAddressDetectionState _dadState;
 
    private readonly uint _validLifetime;
 
    private readonly uint _preferredLifetime;
 
    private readonly byte _prefixLength;
 
    public override IPAddress Address => _innerInfo.Address;
 
    public override IPAddress IPv4Mask
    {
        get
        {
            if (Address.AddressFamily != AddressFamily.InterNetwork)
            {
                return IPAddress.Any;
            }
            return _ipv4Mask;
        }
    }
 
    public override int PrefixLength => _prefixLength;
 
    public override bool IsTransient => _innerInfo.IsTransient;
 
    public override bool IsDnsEligible => _innerInfo.IsDnsEligible;
 
    public override PrefixOrigin PrefixOrigin => _prefixOrigin;
 
    public override SuffixOrigin SuffixOrigin => _suffixOrigin;
 
    public override DuplicateAddressDetectionState DuplicateAddressDetectionState => _dadState;
 
    public override long AddressValidLifetime => _validLifetime;
 
    public override long AddressPreferredLifetime => _preferredLifetime;
 
    public override long DhcpLeaseLifetime => _dhcpLeaseLifetime;
 
    internal SystemUnicastIPAddressInformation(global::Interop.IpHlpApi.IpAdapterUnicastAddress adapterAddress)
    {
        IPAddress iPAddress = adapterAddress.address.MarshalIPAddress();
        _innerInfo = new SystemIPAddressInformation(iPAddress, adapterAddress.flags);
        _prefixOrigin = adapterAddress.prefixOrigin;
        _suffixOrigin = adapterAddress.suffixOrigin;
        _dadState = adapterAddress.dadState;
        _validLifetime = adapterAddress.validLifetime;
        _preferredLifetime = adapterAddress.preferredLifetime;
        _dhcpLeaseLifetime = adapterAddress.leaseLifetime;
        _prefixLength = adapterAddress.prefixLength;
        if (iPAddress.AddressFamily == AddressFamily.InterNetwork)
        {
            _ipv4Mask = UnicastIPAddressInformation.PrefixLengthToSubnetMask(_prefixLength, iPAddress.AddressFamily);
        }
    }
 
    internal static UnicastIPAddressInformationCollection MarshalUnicastIpAddressInformationCollection(IntPtr ptr)
    {
        UnicastIPAddressInformationCollection unicastIPAddressInformationCollection = new UnicastIPAddressInformationCollection();
        while (ptr != IntPtr.Zero)
        {
            global::Interop.IpHlpApi.IpAdapterUnicastAddress adapterAddress = Marshal.PtrToStructure<global::Interop.IpHlpApi.IpAdapterUnicastAddress>(ptr);
            unicastIPAddressInformationCollection.InternalAdd(new SystemUnicastIPAddressInformation(adapterAddress));
            ptr = adapterAddress.next;
        }
        return unicastIPAddressInformationCollection;
    }
}