Use Generic Host model. Refactor server implementations.

src/IPMeow.Dhcp/IPMeow.Dhcp.csproj

@@ -4,8 +4,8 @@
     <ProjectReference Include="..\IPMeow.Lib\IPMeow.Lib.csproj" />
   </ItemGroup>
 
-  <ItemGroup>
-    <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.1" />
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="7.0.1" />
   </ItemGroup>
 
   <PropertyGroup>

src/IPMeow.Dhcp/Program.cs

@@ -1,5 +1,8 @@
 using IPMeow.Dhcp.Server.Dhcp4;
-using IPMeow.Lib.Host;
+using IPMeow.Dhcp.Server.Dhcp6;
+using IPMeow.Dhcp.Standalone;
+using IPMeow.Lib.Request;
+using Microsoft.Extensions.DependencyInjection;
 using Microsoft.Extensions.Hosting;
 
 namespace IPMeow.Dhcp
@@ -8,7 +11,13 @@ namespace IPMeow.Dhcp
     {
         public static async Task Main(string[] args)
         {
-            var app = Microsoft.Extensions.Hosting.Host.CreateDefaultBuilder(args).Build();
+            var app = Host.CreateDefaultBuilder(args).ConfigureServices(s =>
+            {
+                s.AddScoped<HttpClient>();
+                s.AddSingleton<IAddressProvider<AddressRequestContext>, DecoupledIPAddressProvider>();
+                s.AddHostedService<Dhcp4Server>();
+                s.AddHostedService<Dhcp6Server>();
+            }).Build();
 
             Console.WriteLine("Listening on DHCP...");
 

src/IPMeow.Dhcp/Server/Dhcp4/DhcpPacket.cs

@@ -1,6 +1,7 @@
 using System.Net;
 using System.Text;
 using IPMeow.Lib;
+using IPMeow.Lib.Address;
 
 namespace IPMeow.Dhcp.Server.Dhcp4;
 
@@ -20,7 +21,12 @@ public class DhcpPacket
     public required byte[] ClientHWAddress { get; init; }
     public required string ServerHostName { get; init; }
     public required string BootFileName { get; init; }
-    public bool? IsValidated { get; set; }
+    public bool IsValidated { get; set; }
+
+    public override string ToString()
+    {
+        return $"{OpType}, htype: {HType}, hlen: {HLen}, hops: {Hops}\nXid: {Xid}, Seconds: {Seconds}, Flags: {Flags:x}\nci: {ClientAddress}\nyi: {YourAddress}, ns: {NextServerAddress}, ra: {RelayAgentAddress}\nhw: {MacAddress.Parse(GetMacAddress())}\nhost: {ServerHostName}\nboot: {BootFileName}";
+    }
 
     public byte[] GetClientHwAddress()
     {
@@ -36,6 +42,8 @@ public class DhcpPacket
         return buf;
     }
 
+    public byte[] GetMacAddress() => ClientHWAddress[0..6];
+
     public byte[] GetSnameBytes()
     {
         var buf = new byte[64];

src/IPMeow.Dhcp/Server/Dhcp4/DhcpServer.cs

@@ -1,6 +1,6 @@
 using System.Net;
 using System.Net.Sockets;
-using IPMeow.Lib.Address;
+using IPMeow.Lib.Request;
 
 namespace IPMeow.Dhcp.Server.Dhcp4;
 
@@ -8,27 +8,20 @@ public class Dhcp4Server : IDhcpServer, IDisposable
 {
     public const int clientPort = 68, serverPort = 67;
 
-    public Dhcp4Server(IAddressProvider addressProvider)
+    public Dhcp4Server(IAddressProvider<AddressRequestContext> addressProvider)
     {
         _addrProvider = addressProvider;
         _udp = new UdpClient(serverPort, AddressFamily.InterNetwork);
     }
 
-    private readonly IAddressProvider _addrProvider;
+    private readonly IAddressProvider<AddressRequestContext> _addrProvider;
 
-    public event EventHandler<DhcpRequestEvent> DhcpRequestedEvent;
+    public event EventHandler<DhcpRequestEventArgs> DhcpRequestedEvent = delegate { };
 
-    public async Task Run()
+    protected async Task Receive(CancellationToken token)
     {
-        while (true)
-        {
-            await Receive();
-        }
-    }
-
-    protected async Task Receive()
-    {
-        var datagram = await _udp.ReceiveAsync();
+        var datagram = await _udp.ReceiveAsync(token);
+        Console.WriteLine($"New v4 request: {datagram.Buffer.Length}");
 
         if (datagram.Buffer.Length < 236 || datagram.Buffer.Length > 576)
         {
@@ -36,19 +29,23 @@ public class Dhcp4Server : IDhcpServer, IDisposable
         }
 
         var packet = DhcpPacket.Deserialize(datagram.Buffer);
-        packet.IsValidated = ValidateIncoming(packet);
 
-        if (!packet.IsValidated.Value)
+        if (!ValidateIncoming(packet))
         {
             return;
         }
 
+        packet.IsValidated = true;
+
         Console.WriteLine("Solicitation: ");
         Console.WriteLine(packet.ToString());
+
+        //TODO
     }
 
     public bool ValidateIncoming(DhcpPacket packet)
     {
+        Console.WriteLine(packet.ToString());
         if (packet.OpType != DhcpOpType.BOOTREQUEST)
         {
             return false;
@@ -72,7 +69,31 @@ public class Dhcp4Server : IDhcpServer, IDisposable
 
     public void Dispose()
     {
-        throw new NotImplementedException();
+        GC.SuppressFinalize(this);
+        _udp.Dispose();
+    }
+
+    async Task Run(CancellationToken token)
+    {
+        while (true)
+        {
+            if (token.IsCancellationRequested)
+            {
+                return;
+            }
+            await Receive(token);
+        }
+    }
+
+    public async Task StartAsync(CancellationToken cancellationToken)
+    {
+        new Thread(async () => await Run(cancellationToken)).Start();
+        Console.WriteLine("V4 started.");
+    }
+
+    public Task StopAsync(CancellationToken cancellationToken)
+    {
+        return Task.CompletedTask;
     }
 
     private readonly UdpClient _udp;

src/IPMeow.Dhcp/Server/Dhcp6/DhcpOption.cs

@@ -15,8 +15,18 @@ public enum DhcpOptionCode : short
     ElapsedTime = 8,
     ServerUnicast = 12,
     StatusCode = 13,
-
-
+    VendorClass = 16,
+    VendorOptions = 17,
+    IfaceId = 18,
+    DnsServers = 23,
+    DomainList = 24,
+    SntpServers = 31,
+    SubscriberId = 38,
+    ClientFqdn = 39,
+    V6Lost = 51,
+    NtpServer = 56,
+    Addrsel = 84,
+    AddrselTable = 85,
 }
 
 public interface IDhcpOption
@@ -37,7 +47,7 @@ public class ClientIdentifierOption : IDhcpOption
 
     public object GetData()
     {
-        return new Duid(Data);
+        return Duid.Parse(Data);
     }
 }
 
@@ -51,7 +61,7 @@ public class ServerIdentifierOption : IDhcpOption
 
     public object GetData()
     {
-        return new Duid(Data);
+        return Duid.Parse(Data);
     }
 }
 
@@ -155,3 +165,101 @@ public class StatusCodeOption : IDhcpOption
         return new DhcpStatus(code, message);
     }
 }
+
+public class VendorClassOption : IDhcpOption
+{
+    public DhcpOptionCode Code => DhcpOptionCode.VendorClass;
+
+    public required byte[] Data { get; set; }
+
+    public Type DataType => typeof(byte[]);
+
+    public object GetData()
+    {
+        return Data;
+    }
+}
+
+public class InterfaceIdOption : IDhcpOption
+{
+    public DhcpOptionCode Code => DhcpOptionCode.VendorClass;
+
+    public required byte[] Data { get; set; }
+
+    public Type DataType => typeof(byte[]);
+
+    public object GetData()
+    {
+        return Data;
+    }
+}
+
+public class SubscriberIdOption : IDhcpOption
+{
+    public DhcpOptionCode Code => DhcpOptionCode.VendorClass;
+
+    public required byte[] Data { get; set; }
+
+    public Type DataType => typeof(byte[]);
+
+    public object GetData()
+    {
+        return Data;
+    }
+}
+
+public class V6LostOption : IDhcpOption
+{
+    public DhcpOptionCode Code => DhcpOptionCode.VendorClass;
+
+    public required byte[] Data { get; set; }
+
+    public Type DataType => typeof(byte[]);
+
+    public object GetData()
+    {
+        return Data;
+    }
+}
+
+public class ClientFqdnOption : IDhcpOption
+{
+    public DhcpOptionCode Code => DhcpOptionCode.VendorClass;
+
+    public required byte[] Data { get; set; }
+
+    public Type DataType => typeof(byte[]);
+
+    public object GetData()
+    {
+        return Data;
+    }
+}
+
+public class DnsServersOption : IDhcpOption
+{
+    public DhcpOptionCode Code => DhcpOptionCode.VendorClass;
+
+    public required byte[] Data { get; set; }
+
+    public Type DataType => typeof(byte[]);
+
+    public object GetData()
+    {
+        return Data;
+    }
+}
+
+public class NtpServerOption : IDhcpOption
+{
+    public DhcpOptionCode Code => DhcpOptionCode.VendorClass;
+
+    public required byte[] Data { get; set; }
+
+    public Type DataType => typeof(byte[]);
+
+    public object GetData()
+    {
+        return Data;
+    }
+}

src/IPMeow.Dhcp/Server/Dhcp6/DhcpPacket.cs

@@ -16,14 +16,69 @@ public class DhcpPacket
             {
                 Data = data
             },
-            DhcpOptionCode.ServerId => throw new NotImplementedException(),
-            DhcpOptionCode.IANonTempAssoc => throw new NotImplementedException(),
-            DhcpOptionCode.IATempAssoc => throw new NotImplementedException(),
-            DhcpOptionCode.IAAddr => throw new NotImplementedException(),
-            DhcpOptionCode.OptionRequest => throw new NotImplementedException(),
+            DhcpOptionCode.ServerId => new ServerIdentifierOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.IANonTempAssoc => new NonTempIdentityAssociationOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.IATempAssoc => new TempIdentityAssociationOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.IAAddr => new IAAddressOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.OptionRequest => new OptionRequestOption()
+            {
+                Data = data
+            },
             DhcpOptionCode.Preference => throw new NotImplementedException(),
-            DhcpOptionCode.ElapsedTime => throw new NotImplementedException(),
-            DhcpOptionCode.StatusCode => throw new NotImplementedException(),
+            DhcpOptionCode.ElapsedTime => new ElapsedTimeOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.StatusCode => new StatusCodeOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.ServerUnicast => new ServerUnicastOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.VendorClass => new VendorClassOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.IfaceId => new InterfaceIdOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.DnsServers => new DnsServersOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.SubscriberId => new SubscriberIdOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.ClientFqdn => new ClientFqdnOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.V6Lost => new V6LostOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.NtpServer => new NtpServerOption()
+            {
+                Data = data
+            },
+            DhcpOptionCode.Addrsel => throw new NotImplementedException(),
+            DhcpOptionCode.AddrselTable => throw new NotImplementedException(),
             _ => throw new InvalidOperationException($"Invalid option type {type}")
         };
     }
@@ -36,13 +91,22 @@ public class DhcpPacket
 
         DhcpMessageType MessageType = (DhcpMessageType)header[0];
 
-        uint Xid = BitConverter.ToUInt32(header, 1);
+        header[0] = 0;
+        uint Xid = BitConverter.ToUInt32(header);
+
+        Console.WriteLine("Preview:\n{0}", string.Join(' ', data.Select(b => b.ToString("x2"))));
+
+        Console.WriteLine($"v6: {Xid}, {enu.Position}, {MessageType}, {data.Length}");
+
+        List<IDhcpOption> options = new();
 
         while (enu.Position < data.Length)
         {
-            short optionCode = enu.TakeInt16();
+            DhcpOptionCode optionCode = (DhcpOptionCode)enu.TakeInt16();
             short optionLen = enu.TakeInt16();
 
+            Console.WriteLine($"D: {data.Length}, {enu.Position}, {optionCode}, {optionLen}");
+
             if (enu.Position + optionLen > data.Length)
             {
                 throw new DataMisalignedException("Invalid option length.");
@@ -50,13 +114,17 @@ public class DhcpPacket
 
             byte[] optionData = enu.TakeBytes(optionLen);
 
+            Console.WriteLine(string.Join(' ', optionData.Select(b => b.ToString("x2"))));
 
+            IDhcpOption option = GetOption(optionCode, optionData);
+            options.Add(option);
         }
 
         return new()
         {
             MessageType = MessageType,
-            Xid = Xid
+            Xid = Xid,
+            Options = options
         };
     }
 }

src/IPMeow.Dhcp/Server/Dhcp6/DhcpServer.cs

@@ -1,6 +1,6 @@
 using System.Net;
 using System.Net.Sockets;
-using IPMeow.Lib.Address;
+using IPMeow.Lib.Request;
 
 namespace IPMeow.Dhcp.Server.Dhcp6;
 
@@ -8,17 +8,18 @@ public class Dhcp6Server : IDhcpServer, IDisposable
 {
     public const int clientPort = 546, serverPort = 547;
 
-    public Dhcp6Server(IAddressProvider addressProvider)
+    public Dhcp6Server(IAddressProvider<AddressRequestContext> addressProvider)
     {
         _addrProvider = addressProvider;
-        _listener = new(new IPEndPoint(IPAddress.Parse("ff02::1:2"), serverPort));
+        _listener = new(serverPort, AddressFamily.InterNetworkV6);
+        _listener.JoinMulticastGroup(IPAddress.Parse("ff02::1:2"));
         _sender = new(clientPort, AddressFamily.InterNetworkV6);
     }
 
-    private readonly IAddressProvider _addrProvider;
+    private readonly IAddressProvider<AddressRequestContext> _addrProvider;
     private readonly UdpClient _listener, _sender;
 
-    public event EventHandler<DhcpRequestEvent> DhcpRequestedEvent;
+    public event EventHandler<DhcpRequestEventArgs> DhcpRequestedEvent = delegate { };
 
     public void Dispose()
     {
@@ -27,24 +28,44 @@ public class Dhcp6Server : IDhcpServer, IDisposable
         _sender.Dispose();
     }
 
-    public async Task Run()
+    protected async Task Receive(CancellationToken token)
     {
-        while (true)
-        {
-            await Receive();
-        }
-    }
+        var datagram = await _listener.ReceiveAsync(token);
 
-    protected async Task Receive()
-    {
-        var datagram = await _listener.ReceiveAsync();
+        Console.WriteLine($"From v6: {datagram.RemoteEndPoint}, len: {datagram.Buffer.Length}");
 
         var packet = DhcpPacket.Deserialize(datagram.Buffer);
 
+        Console.WriteLine($"New v6 packet: {packet.Xid}, len: {datagram.Buffer.Length}");
+
         if (packet.MessageType is DhcpMessageType.Invalid or DhcpMessageType.Solicit or DhcpMessageType.Confirm or DhcpMessageType.Rebind)
         {
             return;
         }
 
+        //TODO
+    }
+
+    public async Task Run(CancellationToken token)
+    {
+        while (true)
+        {
+            if (token.IsCancellationRequested)
+            {
+                return;
+            }
+            await Receive(token);
+        }
+    }
+
+    public async Task StartAsync(CancellationToken cancellationToken)
+    {
+        new Thread(async () => await Run(cancellationToken)).Start();
+        Console.WriteLine("V6 started.");
+    }
+
+    public Task StopAsync(CancellationToken cancellationToken)
+    {
+        return Task.CompletedTask;
     }
 }

src/IPMeow.Dhcp/Server/Dhcp6/DhcpStatus.cs

@@ -2,6 +2,33 @@ using System.Text;
 
 namespace IPMeow.Dhcp.Server.Dhcp6;
 
+public enum DhcpStatusCode : short
+{
+    Success = 0,
+    UnspecifiedFail = 1,
+    NoAddrAvailable = 2,
+    NoBinding = 3,
+    NotOnLink = 4,
+    UseMulticast = 5,
+    NoPrefixAvailable = 6,
+    UnknownQueryType = 7,
+    MalformedQuery = 8,
+    NotConfigured = 9,
+    NotAllowed = 10,
+    QueryTerminated = 11,
+    DataMissing = 12,
+    CatchUpComplete = 13,
+    NotSupported = 14,
+    TlsConnRefused = 15,
+    AddrInUse = 16,
+    ConfigConflict = 17,
+    MissingBindingInfo = 18,
+    OutdatedBindingInfo = 19,
+    ServerShuttingDown = 20,
+    DnsUpdateNotSupported = 21,
+    ExcessiveTimeSkew = 22
+}
+
 public struct DhcpStatus
 {
     public DhcpStatus(ushort code, string? message)

src/IPMeow.Dhcp/Server/Dhcp6/Duid.cs

@@ -1,3 +1,5 @@
+using IPMeow.Lib.Request;
+
 namespace IPMeow.Dhcp.Server.Dhcp6;
 
 public enum DuidType : short
@@ -8,12 +10,36 @@ public enum DuidType : short
     Uuid = 4
 }
 
-public readonly struct Duid
+public readonly struct Duid : IRequestClientIdentifier
 {
-    public Duid(byte[] data)
+    private Duid(DuidType type, byte[] data)
     {
-        Type = (DuidType)BitConverter.ToInt16(data.AsSpan()[0..2]);
-        Data = data[2..];
+        Type = type;
+        Data = data;
+    }
+
+    private static readonly Duid Invalid = new(0, Array.Empty<byte>());
+
+    public static bool TryParse(byte[] data, out Duid duid)
+    {
+        short dType = BitConverter.ToInt16(data.AsSpan()[0..2]);
+
+        if (!Enum.IsDefined(typeof(DuidType), dType))
+        {
+            duid = Invalid;
+            return false;
+        }
+
+        byte[] duidData = data[2..];
+
+        duid = new((DuidType)dType, duidData);
+
+        return true;
+    }
+
+    public static Duid Parse(byte[] data)
+    {
+        return TryParse(data, out Duid duid) ? duid : throw new InvalidDataException("Invalid data supplied.");
     }
 
     public DuidType Type { get; }

src/IPMeow.Dhcp/Server/DhcpEvent.cs

@@ -1,13 +1,9 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Net;
-using System.Threading.Tasks;
 using IPMeow.Lib.Address;
 
 namespace IPMeow.Dhcp.Server;
 
-public class DhcpRequestEvent
+public class DhcpRequestEventArgs : EventArgs
 {
     public bool IsV6 { get; init; }
     public IPAddress? RequestOrigin { get; init; }

src/IPMeow.Dhcp/Server/IDhcpServer.cs

@@ -1,8 +1,8 @@
+using Microsoft.Extensions.Hosting;
+
 namespace IPMeow.Dhcp.Server;
 
-public interface IDhcpServer
+public interface IDhcpServer : IHostedService
 {
-    Task Run();
-
-    event EventHandler<DhcpRequestEvent> DhcpRequestedEvent;
+    event EventHandler<DhcpRequestEventArgs> DhcpRequestedEvent;
 }

src/IPMeow.Dhcp/Standalone/DecoupledAddressProvider.cs

@@ -1,50 +1,20 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
 using System.Net;
-using System.Threading.Tasks;
-using IPMeow.Lib.Address;
+using IPMeow.Lib.Request;
 
 namespace IPMeow.Dhcp.Standalone;
-public class DecoupledIPv6AddressProvider : IPv6AddressProvider
+
+public class DecoupledIPAddressProvider : IAddressProvider<AddressRequestContext>
 {
-    public DecoupledIPv6AddressProvider(HttpClient http)
+    public DecoupledIPAddressProvider(HttpClient http)
     {
         _http = http;
     }
 
     private readonly HttpClient _http;
 
-    public IPv6Address GetAddress()
-    {
-        _http.GetAsync("/api/request/6/free");
-            throw new NotImplementedException();
-    }
-
-    public IPv6Address GetAddress(MacAddress mac)
+    public IPAddress GetAddress(AddressRequestContext ctx)
     {
-        throw new NotImplementedException();
-    }
-}
-
-public class DecoupledIPv4AddressProvider : IPv4AddressProvider
-{
-    public DecoupledIPv4AddressProvider(HttpClient http)
-    {
-        _http = http;
-    }
-
-    private readonly HttpClient _http;
-
-    public IPv4Address GetAddress()
-    {
-        _http.GetAsync("/api/request/4/free");
-        throw new NotImplementedException();
-    }
-
-    public IPv4Address GetAddress(MacAddress mac)
-    {
-        _http.GetAsync($"/api/request/4/mac/{mac}");
+        _http.GetAsync($"/api/request/{(ctx.IsV6 ? "6" : "4")}/free");
         throw new NotImplementedException();
     }
 }

src/IPMeow.Lib/Address/IAddressProvider.cs

@@ -1,25 +0,0 @@
-using System;
-using System.Collections.Generic;
-using System.Linq;
-using System.Net;
-using System.Threading.Tasks;
-
-namespace IPMeow.Lib.Address;
-
-public interface IAddressProvider
-{
-    public IPAddress GetAddress();
-    public IPAddress GetAddress(MacAddress mac);
-}
-
-public interface IPv4AddressProvider
-{
-    public IPv4Address GetAddress();
-    public IPv4Address GetAddress(MacAddress mac);
-}
-
-public interface IPv6AddressProvider
-{
-    public IPv6Address GetAddress();
-    public IPv6Address GetAddress(MacAddress mac);
-}

src/IPMeow.Lib/Address/MacAddress.cs

@@ -22,7 +22,7 @@ public readonly struct MacAddress
             return mac.Value;
         }
 
-        throw new ArgumentException("Invalid address byte length. Expected 6 octets.");
+        throw new ArgumentException($"Invalid address byte length. Expected 6 octets. Got {addr.Length} octets.");
     }
 
     public static MacAddress Parse(string addr)
@@ -32,7 +32,7 @@ public readonly struct MacAddress
             return mac.Value;
         }
 
-        throw new FormatException("Invalid address format.");
+        throw new FormatException($"Invalid address format: {addr}.");
     }
 
     public static bool TryParse(byte[] addr, [NotNullWhen(true)] out MacAddress? mac)

src/IPMeow.Lib/BitEnumerator.cs

@@ -1,3 +1,5 @@
+using System.Buffers.Binary;
+
 namespace IPMeow.Lib;
 
 public class BitEnumerator
@@ -26,7 +28,7 @@ public class BitEnumerator
 
     public short TakeInt16()
     {
-        short num = BitConverter.ToInt16(_data.AsSpan()[_position..(_position + 2)]);
+        short num = BinaryPrimitives.ReadInt16BigEndian(_data.AsSpan()[_position..(_position + 2)]);
 
         _position += 2;
 
@@ -35,7 +37,7 @@ public class BitEnumerator
 
     public int TakeInt32()
     {
-        int num = BitConverter.ToInt32(_data.AsSpan()[_position..(_position + 4)]);
+        int num = BinaryPrimitives.ReadInt32BigEndian(_data.AsSpan()[_position..(_position + 4)]);
 
         _position += 4;
 
@@ -44,7 +46,7 @@ public class BitEnumerator
 
     public long TakeInt64()
     {
-        long num = BitConverter.ToInt64(_data.AsSpan()[_position..(_position + 8)]);
+        long num = BinaryPrimitives.ReadInt64BigEndian(_data.AsSpan()[_position..(_position + 8)]);
 
         _position += 8;
 
@@ -53,7 +55,7 @@ public class BitEnumerator
 
     public ushort TakeUInt16()
     {
-        ushort num = BitConverter.ToUInt16(_data.AsSpan()[_position..(_position + 2)]);
+        ushort num = BinaryPrimitives.ReadUInt16BigEndian(_data.AsSpan()[_position..(_position + 2)]);
 
         _position += 2;
 
@@ -62,7 +64,7 @@ public class BitEnumerator
 
     public uint TakeUInt32()
     {
-        uint num = BitConverter.ToUInt32(_data.AsSpan()[_position..(_position + 4)]);
+        uint num = BinaryPrimitives.ReadUInt32BigEndian(_data.AsSpan()[_position..(_position + 4)]);
 
         _position += 4;
 
@@ -71,7 +73,7 @@ public class BitEnumerator
 
     public ulong TakeUInt64()
     {
-        ulong num = BitConverter.ToUInt64(_data.AsSpan()[_position..(_position + 8)]);
+        ulong num = BinaryPrimitives.ReadUInt64BigEndian(_data.AsSpan()[_position..(_position + 8)]);
 
         _position += 8;
 

src/IPMeow.Lib/Host/Host.cs

@@ -8,7 +8,17 @@ public class Host : IBindable
 {
     [Key]
     public required string Id { get; set; }
-    public DateTime? LastPing { get; set; }
+    [MaxLength(16)]
+    public byte[] Duid { get; set; } = default!;
+    public HostType HostType { get; set; }
     public required IPAddressCollection Addresses { get; set; }
     public required MacAddress Mac { get; set; }
 }
+
+public enum HostType : byte
+{
+    Physical = 0b1,
+    Virtual = 0b10,
+    Container = 0b100,
+    Other = 0b1000000,
+}

src/IPMeow.Lib/Host/HostInterface.cs

@@ -0,0 +1,15 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace IPMeow.Lib.Host;
+
+public class HostInterface
+{
+    [Key]
+    public required string Id { get; set; }
+    public byte[] IAID { get; set; } = default!;
+    public DateTime LastPinged { get; set; }
+    public DateTime LastAssignment { get; set; }
+
+    public string HostId { get; set; } = default!;
+    public virtual Host Host { get; set; } = default!;
+}

src/IPMeow.Lib/Request/AddressRequestContext.cs

@@ -0,0 +1,9 @@
+using IPMeow.Lib.Address;
+
+namespace IPMeow.Lib.Request;
+
+public class AddressRequestContext
+{
+    public bool IsV6 { get; set; }
+    public MacAddress? MacAddress { get; set; }
+}

src/IPMeow.Lib/Request/IAddressProvider.cs

@@ -0,0 +1,8 @@
+using System.Net;
+
+namespace IPMeow.Lib.Request;
+
+public interface IAddressProvider<T> where T : AddressRequestContext
+{
+    public IPAddress GetAddress(T ctx);
+}

src/IPMeow.Lib/Request/IRequestClientIdentifier.cs

@@ -0,0 +1,6 @@
+namespace IPMeow.Lib.Request;
+
+public interface IRequestClientIdentifier
+{
+    
+}

src/IPMeow.Server/Controllers/AddressController.cs

@@ -0,0 +1,21 @@
+using IPMeow.Lib.Request;
+using Microsoft.AspNetCore.Mvc;
+
+namespace IPMeow.Server.Controllers;
+
+[ApiController]
+[Route("api/[controller]")]
+public class AddressController : ControllerBase
+{
+    [HttpPost("request")]
+    public async Task<IActionResult> RequestAddress(AddressRequestContext ctx)
+    {
+        throw new NotImplementedException();
+    }
+
+    [HttpGet]
+    public async Task<IActionResult> ConfirmRequest()
+    {
+        throw new NotImplementedException();
+    }
+}

src/IPMeow.Server/Data/IpamContext.cs

@@ -0,0 +1,26 @@
+using IPMeow.Lib.Host;
+using IPMeow.Server.Data.Model;
+using Microsoft.EntityFrameworkCore;
+
+namespace IPMeow.Server.Data;
+
+public class IpamContext : DbContext
+{
+    public DbSet<Lib.Host.Host> Hosts => Set<Lib.Host.Host>();
+    public DbSet<HostInterface> HostInterfaces => Set<HostInterface>();
+    public DbSet<AddressAssignment> Assignments => Set<AddressAssignment>();
+
+    protected override void OnConfiguring(DbContextOptionsBuilder opt)
+    {
+        opt.LogTo(t => Console.WriteLine(t));
+        opt.EnableDetailedErrors();
+        opt.EnableSensitiveDataLogging();
+        base.OnConfiguring(opt);
+    }
+
+    protected override void OnModelCreating(ModelBuilder mb)
+    {
+        mb.Entity<AddressAssignment>().HasKey(ass => new { Address = ass.Address.GetAddressBytes(), HostId = ass.HostInterfaceId });
+        base.OnModelCreating(mb);
+    }
+}

src/IPMeow.Server/Data/Model/AddressAssignment.cs

@@ -0,0 +1,13 @@
+using System.Net;
+using IPMeow.Lib.Host;
+
+namespace IPMeow.Server.Data.Model;
+
+public class AddressAssignment
+{
+    public required string HostInterfaceId { get; set; }
+    public required IPAddress Address { get; set; }
+    public DateTime LastAssigned { get; set; }
+
+    public virtual HostInterface HostInterface { get; set; } = default!;
+}

src/IPMeow.Server/Data/Model/AddressBlock.cs

@@ -0,0 +1,9 @@
+using System.Net;
+
+namespace IPMeow.Server.Data.Model;
+
+public class AddressBlock
+{
+    public required IPAddress Address { get; set; }
+    public required int Prefix { get; set; }
+}

src/IPMeow.Server/Data/Model/AddressPolicy.cs

@@ -0,0 +1,6 @@
+namespace IPMeow.Server.Data.Model;
+
+public class AddressPolicy
+{
+    public bool IsTemporary { get; set; }
+}

src/IPMeow.Server/IPMeow.Server.csproj

@@ -1,5 +1,14 @@
 <Project Sdk="Microsoft.NET.Sdk.Web">
 
+  <ItemGroup>
+    <ProjectReference Include="..\IPMeow.Lib\IPMeow.Lib.csproj" />
+    <ProjectReference Include="..\IPMeow.Dhcp\IPMeow.Dhcp.csproj" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="7.0.5" />
+  </ItemGroup>
+
   <PropertyGroup>
     <TargetFramework>net7.0</TargetFramework>
     <Nullable>enable</Nullable>

src/IPMeow.Server/Program.cs

@@ -1,4 +1,9 @@
+using IPMeow.Server.Data;
+
 var builder = WebApplication.CreateBuilder(args);
+
+builder.Services.AddDbContext<IpamContext>();
+
 var app = builder.Build();
 
 app.Run();

test/IPMeow.Test/StructTests.cs

@@ -1,4 +1,3 @@
-using IPMeow.Lib;
 using IPMeow.Lib.Address;
 
 namespace IPMeow.Test;