Started serializing bunches

src/Prospect.Unreal.Tests/Net/Packets/Header/FPackedHeaderTests.cs

@@ -0,0 +1,30 @@
+using System.Diagnostics.CodeAnalysis;
+using NUnit.Framework;
+using Prospect.Unreal.Net.Packets.Header;
+
+namespace Prospect.Unreal.Tests.Net.Packets.Header;
+
+[SuppressMessage("ReSharper", "HeapView.BoxingAllocation")]
+public class FPackedHeaderTests
+{
+    [Test]
+    [TestCase((uint)1221642592, (ushort)4660)]
+    public void TestGetSeq(uint input, ushort output)
+    {
+        Assert.AreEqual(output, FPackedHeader.GetSeq(input).Value);
+    }
+    
+    [Test]
+    [TestCase((uint)1221642592, (ushort)3222)]
+    public void TestGetAckedSeq(uint input, ushort output)
+    {
+        Assert.AreEqual(output, FPackedHeader.GetAckedSeq(input).Value);
+    }
+    
+    [Test]
+    [TestCase((uint)1221642592, (uint)0)]
+    public void TestGetHistoryWordCount(uint input, uint output)
+    {
+        Assert.AreEqual(output, FPackedHeader.GetHistoryWordCount(input));
+    }
+}

src/Prospect.Unreal.Tests/Prospect.Unreal.Tests.csproj

@@ -0,0 +1,21 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <TargetFramework>net6.0</TargetFramework>
+        <Nullable>enable</Nullable>
+
+        <IsPackable>false</IsPackable>
+    </PropertyGroup>
+
+    <ItemGroup>
+        <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.11.0" />
+        <PackageReference Include="NUnit" Version="3.13.2" />
+        <PackageReference Include="NUnit3TestAdapter" Version="4.0.0" />
+        <PackageReference Include="coverlet.collector" Version="3.1.0" />
+    </ItemGroup>
+
+    <ItemGroup>
+      <ProjectReference Include="..\Prospect.Unreal\Prospect.Unreal.csproj" />
+    </ItemGroup>
+
+</Project>

src/Prospect.Unreal/Core/EEngineNetworkVersionHistory.cs

@@ -1,6 +1,6 @@
 namespace Prospect.Unreal.Core;
 
-public enum EEngineNetworkVersionHistory
+public enum EEngineNetworkVersionHistory : uint
 {
     HISTORY_INITIAL = 1,
     HISTORY_REPLAY_BACKWARDS_COMPAT = 2,			// Bump version to get rid of older replays before backwards compat was turned on officially

src/Prospect.Unreal/Core/FUrl.cs

@@ -4,11 +4,11 @@ namespace Prospect.Unreal.Core;
 
 public class FUrl
 {
-    public string Protocol { get; init; } = "unreal";
+    public string Protocol { get; set; } = "unreal";
-    public IPAddress Host { get; init; } = IPAddress.Any;
+    public IPAddress Host { get; set; } = IPAddress.Any;
-    public int Port { get; init; } = 7777;
+    public int Port { get; set; } = 7777;
-    public string Map { get; init; } = "GearStart";
+    public string Map { get; set; } = "GearStart";
-    public string RedirectUrl { get; init; } = string.Empty;
+    public string RedirectUrl { get; set; } = string.Empty;
-    public List<string> Options { get; init; } = new List<string>();
+    public List<string> Options { get; set; } = new List<string>();
-    public string Portal { get; init; } = string.Empty;
+    public string Portal { get; set; } = string.Empty;
 }

src/Prospect.Unreal/Core/Names/FName.cs

@@ -0,0 +1,36 @@
+namespace Prospect.Unreal.Core.Names;
+
+public class FName
+{
+    public FName()
+    {
+        NameIndex = -1; // ?
+        Number = -1; // ?
+        Str = "None";
+    }
+
+    public FName(string str)
+    {
+        NameIndex = -1;
+        Number = -1;
+        Str = str;
+    }
+
+    public FName(string str, int number)
+    {
+        NameIndex = -1;
+        Number = number;
+        Str = str;
+    }
+
+    public Int32 NameIndex { get; set; }
+
+    public Int32 Number { get; set; }
+
+    public string Str { get; set; }
+
+    public override string ToString()
+    {
+        return Str;
+    }
+}

src/Prospect.Unreal/Core/Names/UnrealNameKey.cs

@@ -0,0 +1,202 @@
+namespace Prospect.Unreal.Core.Names
+{
+    public enum UnrealNameKey
+    {
+        None = 0,
+
+        // Class property types (name indices are significant for serialization).
+        ByteProperty = 1,
+        IntProperty = 2,
+        BoolProperty = 3,
+        FloatProperty = 4,
+        ObjectProperty = 5, // ClassProperty shares the same tag
+        NameProperty = 6,
+        DelegateProperty = 7,
+        DoubleProperty = 8,
+        ArrayProperty = 9,
+        StructProperty = 10,
+        VectorProperty = 11,
+        RotatorProperty = 12,
+        StrProperty = 13,
+        TextProperty = 14,
+        InterfaceProperty = 15,
+        MulticastDelegateProperty = 16,
+        //Available = 17,
+        LazyObjectProperty = 18,
+        SoftObjectProperty = 19, // SoftClassProperty shares the same tag
+        UInt64Property = 20,
+        UInt32Property = 21,
+        UInt16Property = 22,
+        Int64Property = 23,
+        Int16Property = 25,
+        Int8Property = 26,
+        //Available = 27,
+        MapProperty = 28,
+        SetProperty = 29,
+        
+        // Special packages.
+        Core = 30,
+        Engine = 31,
+        Editor = 32,
+        CoreUObject = 33,
+        
+        // More class properties
+        EnumProperty = 34,
+        
+        // Special types.
+        Cylinder = 50,
+        BoxSphereBounds = 51,
+        Sphere = 52,
+        Box = 53,
+        Vector2D = 54,
+        IntRect = 55,
+        IntPoint = 56,
+        Vector4 = 57,
+        Name = 58,
+        Vector = 59,
+        Rotator = 60,
+        SHVector = 61,
+        Color = 62,
+        Plane = 63,
+        Matrix = 64,
+        LinearColor = 65,
+        AdvanceFrame = 66,
+        Pointer = 67,
+        Double = 68,
+        Quat = 69,
+        Self = 70,
+        Transform = 71,
+        
+        // Object class names.
+        Object = 100,
+        Camera = 101,
+        Actor = 102,
+        ObjectRedirector = 103,
+        ObjectArchetype = 104,
+        Class = 105,
+        ScriptStruct = 106,
+        Function = 107,
+        
+        // Misc.
+        State = 200,
+        TRUE = 201,
+        FALSE = 202,
+        Enum = 203,
+        Default = 204,
+        Skip = 205,
+        Input = 206,
+        Package = 207,
+        Groups = 208,
+        Interface = 209,
+        Components = 210,
+        Global = 211,
+        Super = 212,
+        Outer = 213,
+        Map = 214,
+        Role = 215,
+        RemoteRole = 216,
+        PersistentLevel = 217,
+        TheWorld = 218,
+        PackageMetaData = 219,
+        InitialState = 220,
+        Game = 221,
+        SelectionColor = 222,
+        UI = 223,
+        ExecuteUbergraph = 224,
+        DeviceID = 225,
+        RootStat = 226,
+        MoveActor = 227,
+        All = 230, 
+        MeshEmitterVertexColor = 231,
+        TextureOffsetParameter = 232,
+        TextureScaleParameter = 233,
+        ImpactVel = 234,
+        SlideVel = 235,
+        TextureOffset1Parameter = 236,
+        MeshEmitterDynamicParameter = 237,
+        ExpressionInput = 238,
+        Untitled = 239,
+        Timer = 240,
+        Team = 241,
+        Low = 242,
+        High = 243,
+        NetworkGUID = 244,
+        GameThread = 245,
+        RenderThread = 246,
+        OtherChildren = 247,
+        Location = 248,
+        Rotation = 249,
+        BSP = 250,
+        EditorSettings = 251,
+        AudioThread = 252,
+        ID = 253,
+        UserDefinedEnum = 254,
+        Control = 255,
+        Voice = 256,
+         Zlib = 257,
+         Gzip = 258,
+        
+        // Online
+        DGram = 280,
+        Stream = 281,
+        GameNetDriver = 282,
+        PendingNetDriver = 283,
+        BeaconNetDriver = 284,
+        FlushNetDormancy = 285,
+        DemoNetDriver = 286,
+        GameSession = 287,
+        PartySession = 288,
+        GamePort = 289,
+        BeaconPort = 290,
+        MeshPort = 291,
+        MeshNetDriver = 292,
+        
+        // Texture settings.
+        Linear = 300,
+        Point = 301,
+        Aniso = 302,
+        LightMapResolution = 303,
+        
+        // Sound.
+        // = 310,
+        UnGrouped = 311,
+        VoiceChat = 312,
+        
+        // Optimized replication.
+        Playing = 320,
+        Spectating = 322,
+        Inactive = 325,
+        
+        // Log messages.
+        PerfWarning = 350,
+        Info = 351,
+        Init = 352,
+        Exit = 353,
+        Cmd = 354,
+        Warning = 355,
+        Error = 356,
+        
+        // File format backwards-compatibility.
+        FontCharacter = 400,
+        InitChild2StartBone = 401,
+        SoundCueLocalized = 402,
+        SoundCue = 403,
+        RawDistributionFloat = 404,
+        RawDistributionVector = 405,
+        InterpCurveFloat = 406,
+        InterpCurveVector2D = 407,
+        InterpCurveVector = 408,
+        InterpCurveTwoVectors = 409,
+        InterpCurveQuat = 410,
+        
+        AI = 450,
+        NavMesh = 451,
+        
+        PerformanceCapture = 500,
+        
+        // Special config names - not required to be consistent for network replication
+        EditorLayout = 600,
+        EditorKeyBindings = 601,
+        GameUserSettings = 602
+    }
+}

src/Prospect.Unreal/Core/Names/UnrealNames.cs

@@ -0,0 +1,231 @@
+namespace Prospect.Unreal.Core.Names
+{
+    public static class UnrealNames
+    {
+        public const int MaxNetworkedHardcodedName = 410;
+        
+        static UnrealNames()
+        {
+            // ReSharper disable once UseObjectOrCollectionInitializer
+            var names = new Dictionary<int, string>();
+            
+            // Special zero value, meaning no name.
+            names.Add(0, "None");
+
+            // Class property types (name indices are significant for serialization).
+            names.Add(1, "ByteProperty");
+            names.Add(2, "IntProperty");
+            names.Add(3, "BoolProperty");
+            names.Add(4, "FloatProperty");
+            names.Add(5, "ObjectProperty"); // ClassProperty shares the same tag
+            names.Add(6, "NameProperty");
+            names.Add(7, "DelegateProperty");
+            names.Add(8, "DoubleProperty");
+            names.Add(9, "ArrayProperty");
+            names.Add(10, "StructProperty");
+            names.Add(11, "VectorProperty");
+            names.Add(12, "RotatorProperty");
+            names.Add(13, "StrProperty");
+            names.Add(14, "TextProperty");
+            names.Add(15, "InterfaceProperty");
+            names.Add(16, "MulticastDelegateProperty");
+            //Names.Add(17, "Available");
+            names.Add(18, "LazyObjectProperty");
+            names.Add(19, "SoftObjectProperty"); // SoftClassProperty shares the same tag
+            names.Add(20, "UInt64Property");
+            names.Add(21, "UInt32Property");
+            names.Add(22, "UInt16Property");
+            names.Add(23, "Int64Property");
+            names.Add(25, "Int16Property");
+            names.Add(26, "Int8Property");
+            //Names.Add(27, "Available");
+            names.Add(28, "MapProperty");
+            names.Add(29, "SetProperty");
+
+            // Special packages.
+            names.Add(30, "Core");
+            names.Add(31, "Engine");
+            names.Add(32, "Editor");
+            names.Add(33, "CoreUObject");
+
+            // More class properties
+            names.Add(34, "EnumProperty");
+
+            // Special types.
+            names.Add(50, "Cylinder");
+            names.Add(51, "BoxSphereBounds");
+            names.Add(52, "Sphere");
+            names.Add(53, "Box");
+            names.Add(54, "Vector2D");
+            names.Add(55, "IntRect");
+            names.Add(56, "IntPoint");
+            names.Add(57, "Vector4");
+            names.Add(58, "Name");
+            names.Add(59, "Vector");
+            names.Add(60, "Rotator");
+            names.Add(61, "SHVector");
+            names.Add(62, "Color");
+            names.Add(63, "Plane");
+            names.Add(64, "Matrix");
+            names.Add(65, "LinearColor");
+            names.Add(66, "AdvanceFrame");
+            names.Add(67, "Pointer");
+            names.Add(68, "Double");
+            names.Add(69, "Quat");
+            names.Add(70, "Self");
+            names.Add(71, "Transform");
+
+            // Object class names.
+            names.Add(100, "Object");
+            names.Add(101, "Camera");
+            names.Add(102, "Actor");
+            names.Add(103, "ObjectRedirector");
+            names.Add(104, "ObjectArchetype");
+            names.Add(105, "Class");
+            names.Add(106, "ScriptStruct");
+            names.Add(107, "Function");
+            names.Add(108, "Pawn");
+
+            // Misc.
+            names.Add(200, "State");
+            names.Add(201, "TRUE");
+            names.Add(202, "FALSE");
+            names.Add(203, "Enum");
+            names.Add(204, "Default");
+            names.Add(205, "Skip");
+            names.Add(206, "Input");
+            names.Add(207, "Package");
+            names.Add(208, "Groups");
+            names.Add(209, "Interface");
+            names.Add(210, "Components");
+            names.Add(211, "Global");
+            names.Add(212, "Super");
+            names.Add(213, "Outer");
+            names.Add(214, "Map");
+            names.Add(215, "Role");
+            names.Add(216, "RemoteRole");
+            names.Add(217, "PersistentLevel");
+            names.Add(218, "TheWorld");
+            names.Add(219, "PackageMetaData");
+            names.Add(220, "InitialState");
+            names.Add(221, "Game");
+            names.Add(222, "SelectionColor");
+            names.Add(223, "UI");
+            names.Add(224, "ExecuteUbergraph");
+            names.Add(225, "DeviceID");
+            names.Add(226, "RootStat");
+            names.Add(227, "MoveActor");
+            names.Add(230, "All");
+            names.Add(231, "MeshEmitterVertexColor");
+            names.Add(232, "TextureOffsetParameter");
+            names.Add(233, "TextureScaleParameter");
+            names.Add(234, "ImpactVel");
+            names.Add(235, "SlideVel");
+            names.Add(236, "TextureOffset1Parameter");
+            names.Add(237, "MeshEmitterDynamicParameter");
+            names.Add(238, "ExpressionInput");
+            names.Add(239, "Untitled");
+            names.Add(240, "Timer");
+            names.Add(241, "Team");
+            names.Add(242, "Low");
+            names.Add(243, "High");
+            names.Add(244, "NetworkGUID");
+            names.Add(245, "GameThread");
+            names.Add(246, "RenderThread");
+            names.Add(247, "OtherChildren");
+            names.Add(248, "Location");
+            names.Add(249, "Rotation");
+            names.Add(250, "BSP");
+            names.Add(251, "EditorSettings");
+            names.Add(252, "AudioThread");
+            names.Add(253, "ID");
+            names.Add(254, "UserDefinedEnum");
+            names.Add(255, "Control");
+            names.Add(256, "Voice");
+            names.Add(257, " Zlib");
+            names.Add(258, " Gzip");
+            names.Add(259, " LZ4");
+            names.Add(260, " Mobile");
+
+            // Online
+            names.Add(280, "DGram");
+            names.Add(281, "Stream");
+            names.Add(282, "GameNetDriver");
+            names.Add(283, "PendingNetDriver");
+            names.Add(284, "BeaconNetDriver");
+            names.Add(285, "FlushNetDormancy");
+            names.Add(286, "DemoNetDriver");
+            names.Add(287, "GameSession");
+            names.Add(288, "PartySession");
+            names.Add(289, "GamePort");
+            names.Add(290, "BeaconPort");
+            names.Add(291, "MeshPort");
+            names.Add(292, "MeshNetDriver");
+            names.Add(293, "LiveStreamVoice");
+            names.Add(294, "LiveStreamAnimation");
+
+            // Texture settings.
+            names.Add(300, "Linear");
+            names.Add(301, "Point");
+            names.Add(302, "Aniso");
+            names.Add(303, "LightMapResolution");
+
+            // Sound.
+            //Names.Add(310, "");
+            names.Add(311, "UnGrouped");
+            names.Add(312, "VoiceChat");
+
+            // Optimized replication.
+            names.Add(320, "Playing");
+            names.Add(322, "Spectating");
+            names.Add(325, "Inactive");
+
+            // Log messages.
+            names.Add(350, "PerfWarning");
+            names.Add(351, "Info");
+            names.Add(352, "Init");
+            names.Add(353, "Exit");
+            names.Add(354, "Cmd");
+            names.Add(355, "Warning");
+            names.Add(356, "Error");
+
+            // File format backwards-compatibility.
+            names.Add(400, "FontCharacter");
+            names.Add(401, "InitChild2StartBone");
+            names.Add(402, "SoundCueLocalized");
+            names.Add(403, "SoundCue");
+            names.Add(404, "RawDistributionFloat");
+            names.Add(405, "RawDistributionVector");
+            names.Add(406, "InterpCurveFloat");
+            names.Add(407, "InterpCurveVector2D");
+            names.Add(408, "InterpCurveVector");
+            names.Add(409, "InterpCurveTwoVectors");
+            names.Add(410, "InterpCurveQuat");
+
+            names.Add(450, "AI");
+            names.Add(451, "NavMesh");
+
+            names.Add(500, "PerformanceCapture");
+
+            // Special config names - not required to be consistent for network replication
+            names.Add(600, "EditorLayout");
+            names.Add(601, "EditorKeyBindings");
+            names.Add(602, "GameUserSettings");
+            
+            names.Add(700, "Filename");
+            names.Add(701, "Lerp");
+            names.Add(702, "Root");
+            
+            // Save.
+            Names = names;
+            FNames = Names.ToDictionary(x => (UnrealNameKey) x.Key, y => new FName(y.Value, y.Key));
+            MaxHardcodedNameIndex = Names.Last().Key + 1;
+        }
+
+        public static IReadOnlyDictionary<int, string> Names { get; }
+
+        public static IReadOnlyDictionary<UnrealNameKey, FName> FNames { get; }
+        
+        public static int MaxHardcodedNameIndex { get; }
+    }
+}

src/Prospect.Unreal/Net/Channels/EChannelCloseReason.cs

@@ -0,0 +1,12 @@
+namespace Prospect.Unreal.Net.Channels;
+
+public enum EChannelCloseReason
+{
+    Destroyed,
+    Dormancy,
+    LevelUnloaded,
+    Relevancy,
+    TearOff,
+    /* reserved */
+    MAX	= 15		// this value is used for serialization, modifying it may require a network version change
+}

src/Prospect.Unreal/Net/Channels/EChannelCreateFlags.cs

@@ -0,0 +1,8 @@
+namespace Prospect.Unreal.Net.Channels;
+
+[Flags]
+public enum EChannelCreateFlags
+{
+    None			= (1 << 0),
+    OpenedLocally	= (1 << 1)
+}

src/Prospect.Unreal/Net/Channels/EChannelType.cs

@@ -0,0 +1,13 @@
+namespace Prospect.Unreal.Net.Channels;
+
+public static class EChannelType
+{
+    public const int CHTYPE_None = 0; // Invalid type.
+    public const int CHTYPE_Control = 1; // Connection control.
+    public const int CHTYPE_Actor = 2; // Actor-update channel.
+
+    public const int CHTYPE_File = 3; // Binary file transfer.
+
+    public const int CHTYPE_Voice = 4; // VoIP data channel
+    public const int CHTYPE_MAX = 8; // Maximum.
+}

src/Prospect.Unreal/Net/CoreNet.cs

@@ -1,6 +0,0 @@
-namespace Prospect.Unreal.Net;
-
-internal class CoreNet
-{
-    public const int MaxPacketSize = 1024;
-}

src/Prospect.Unreal/Net/EClientLoginState.cs

@@ -0,0 +1,10 @@
+namespace Prospect.Unreal.Net;
+
+public enum EClientLoginState
+{
+    Invalid		 = 0, // This must be a client (which doesn't use this state) or uninitialized.
+    LoggingIn	 = 1, // The client is currently logging in.
+    Welcomed	 = 2, // Told client to load map and will respond with SendJoin
+    ReceivedJoin = 3, // NMT_Join received and a player controller has been created
+    CleanedUp	 = 4  // Cleanup has been called at least once, the connection is considered abandoned/terminated/gone
+}

src/Prospect.Unreal/Net/ECountUnits.cs

@@ -0,0 +1,7 @@
+namespace Prospect.Unreal.Net;
+
+public enum ECountUnits
+{
+    Bits,
+    Bytes
+}

src/Prospect.Unreal/Net/FChannelDefinition.cs

@@ -0,0 +1,3 @@
+namespace Prospect.Unreal.Net;
+
+public record FChannelDefinition(string Name, Type Class, int StaticChannelIndex, bool TickOnCreate, bool ServerOpen, bool ClientOpen, bool InitialServer, bool InitialClient);

src/Prospect.Unreal/Net/FNetGUIDCache.cs

@@ -0,0 +1,11 @@
+namespace Prospect.Unreal.Net;
+
+public class FNetGUIDCache
+{
+    public FNetGUIDCache(UNetDriver driver)
+    {
+        Driver = driver;
+    }
+
+    public UNetDriver Driver { get; }
+}

src/Prospect.Unreal/Net/FReceiveThreadRunnable.cs

@@ -34,7 +34,7 @@ public class FReceiveThreadRunnable : IAsyncDisposable
         if (_receiveQueue.TryDequeue(out var packet))
         {
             result = new FReceivedPacketView(
-                new FPacketDataView(packet.Buffer, packet.Buffer.Length),
+                new FPacketDataView(packet.Buffer, packet.Buffer.Length, ECountUnits.Bytes),
                 packet.Address, 
                 new FInPacketTraits());
             
@@ -58,10 +58,10 @@ public class FReceiveThreadRunnable : IAsyncDisposable
                     continue;
                 }
             
-                if (result.Buffer.Length > CoreNet.MaxPacketSize)
+                if (result.Buffer.Length > UNetConnection.MaxPacketSize)
                 {
                     Logger.Warning("Received packet exceeding MaxPacketSize ({Size} > {Max}) from {Ip}", 
-                        result.Buffer.Length, CoreNet.MaxPacketSize, result.RemoteEndPoint);
+                        result.Buffer.Length, UNetConnection.MaxPacketSize, result.RemoteEndPoint);
                     continue;
                 }
 

src/Prospect.Unreal/Net/PacketHandler.cs

@@ -50,7 +50,11 @@ public class PacketHandler
 
         if (!_bConnectionlessHandler)
         {
-            throw new NotImplementedException();
+            // TODO: Load from .ini file (GEngineIni)
+            //  %s PacketHandlerProfileConfig (Driver..)
+            //  Components
+            
+            // If no matches, load from PacketHandlerComponents / Components in GEngineIni
         }
         
         // TODO: FEncryptionComponent.
@@ -93,6 +97,19 @@ public class PacketHandler
         return Outgoing_Internal(packet, countBits, traits, true, address);
     }
 
+    public void BeginHandshaking()
+    {
+        // bBeganHandshaking = true;
+
+        foreach (var component in _handlerComponents)
+        {
+            if (component.RequiresHandshake() && !component.IsInitialized())
+            {
+                component.NotifiyHandshakeBegin();
+            }
+        }
+    }
+
     public HandlerComponent AddHandler<T>() where T : HandlerComponent
     {
         var result = (HandlerComponent) Activator.CreateInstance(typeof(T), this)!;
@@ -102,6 +119,16 @@ public class PacketHandler
         return result;
     }
 
+    public bool Incoming(FReceivedPacketView packetView)
+    {
+        return Incoming_Internal(packetView);
+    }
+
+    public void IncomingHigh(FBitReader reader)
+    {
+        // NO-OP
+    }
+
     private bool Incoming_Internal(FReceivedPacketView packetView)
     {
         var returnVal = true;
@@ -159,7 +186,7 @@ public class PacketHandler
             {
                 ReplaceIncomingPacket(processPacketReader);
 
-                packetView.DataView = new FPacketDataView(_incomingPacket.GetBuffer(), _incomingPacket.GetBitsLeft());
+                packetView.DataView = new FPacketDataView(_incomingPacket.GetBuffer(), _incomingPacket.GetBitsLeft(), ECountUnits.Bits);
             }
             else
             {

src/Prospect.Unreal/Net/PacketView.cs

@@ -1,4 +1,5 @@
 using System.Net;
+using Prospect.Unreal.Core;
 
 namespace Prospect.Unreal.Net;
 
@@ -8,16 +9,27 @@ public class FInPacketTraits
     public bool FromRecentlyDisconnected { get; set; }
 }
 
-public class FPacketDataView
+public readonly struct FPacketDataView
 {
     private readonly byte[] _data;
+    private readonly int _count;
     private readonly int _countBits;
 
-    public FPacketDataView(byte[] data, int length)
+    public FPacketDataView(byte[] data, int length, ECountUnits unit)
     {
         _data = data;
+
+        if (unit == ECountUnits.Bits)
+        {
+            _count = FMath.DivideAndRoundUp(length, 8);
+            _countBits = length;
+        }
+        else /* if (unit == ECountUnits.Bytes) */
+        {
+            _count = length;
             _countBits = length * 8;
         }
+    }
 
     public byte[] GetData()
     {
@@ -31,7 +43,7 @@ public class FPacketDataView
 
     public int NumBytes()
     {
-        return _data.Length;
+        return _count;
     }
 }
 

src/Prospect.Unreal/Net/Packets/Bunch/FInBunch.cs

@@ -0,0 +1,95 @@
+using Prospect.Unreal.Core.Names;
+using Prospect.Unreal.Net.Channels;
+using Prospect.Unreal.Serialization;
+
+namespace Prospect.Unreal.Net.Packets.Bunch
+{
+    public class FInBunch : FNetBitReader
+    {
+        public FInBunch(UNetConnection inConnection, byte[]? src = null, int countBits = 0) : base(inConnection.PackageMap, src, countBits)
+        {
+            PacketId = 0;
+            Next = null;
+            Connection = inConnection;
+            ChIndex = 0;
+            ChType = 0; // TODO: CHTYPE_None
+            ChName = UnrealNames.FNames[UnrealNameKey.None]; // TODO: NAME_None
+            ChSequence = 0;
+            bOpen = false;
+            bClose = false;
+            bDormant = false;
+            bReliable = false;
+            bPartial = false;
+            bPartialInitial = false;
+            bPartialFinal = false;
+            bHasPackageMapExports = false;
+            bHasMustBeMappedGUIDs = false;
+            bIgnoreRPCs = false;
+            CloseReason = EChannelCloseReason.Destroyed;
+            
+            // TODO: SetByteSwapping(Connection->bNeedsByteSwapping);
+            
+            SetEngineNetVer(Connection.EngineNetworkProtocolVersion);
+            SetGameNetVer(Connection.GameNetworkProtocolVersion);
+        }
+
+        public int PacketId { get; set; }
+        
+        public FInBunch? Next { get; set; }
+
+        public UNetConnection Connection { get; }
+
+        public int ChIndex { get; set; }
+
+        public int ChType { get; set; }
+        
+        public FName ChName { get; set; }
+
+        public int ChSequence { get; set; }
+
+        public bool bOpen { get; set; }
+
+        public bool bClose { get; set; }
+
+        /// <summary>
+        ///     Close, but go dormant.
+        /// </summary>
+        public bool bDormant { get; set; }
+
+        /// <summary>
+        ///     Replication on this channel is being paused by the server.
+        /// </summary>
+        public bool bIsReplicationPaused { get; set; }
+
+        public bool bReliable { get; set; }
+
+        /// <summary>
+        ///     Not a complete bunch
+        /// </summary>
+        public bool bPartial { get; set; }
+
+        /// <summary>
+        ///     The first bunch of a partial bunch
+        /// </summary>
+        public bool bPartialInitial { get; set; }
+
+        /// <summary>
+        ///     The final bunch of a partial bunch
+        /// </summary>
+        public bool bPartialFinal { get; set; }
+        
+        /// <summary>
+        ///     This bunch has networkGUID name/id pairs.
+        /// </summary>
+        public bool bHasPackageMapExports { get; set; }
+
+        /// <summary>
+        ///     This bunch has guids that must be mapped before we can process this bunch.
+        /// </summary>
+        public bool bHasMustBeMappedGUIDs { get; set; }
+        
+        public bool bIgnoreRPCs { get; set; }
+        
+        public EChannelCloseReason CloseReason { get; set; }
+    }
+}

src/Prospect.Unreal/Net/Packets/Header/FNetPacketNotify.cs

@@ -0,0 +1,146 @@
+using Prospect.Unreal.Net.Packets.Header.Sequence;
+using Prospect.Unreal.Serialization;
+using Serilog;
+
+namespace Prospect.Unreal.Net.Packets.Header;
+
+public delegate void HandlePacketNotification(SequenceNumber ackedSequence, bool delivered);
+
+public class FNetPacketNotify
+{
+    private static readonly ILogger Logger = Log.ForContext<FNetPacketNotify>();
+    
+    public const int SequenceNumberBits = 14;
+    public const int MaxSequenceHistoryLength = 256;
+
+    private readonly Queue<FSentAckData> _ackRecord = new Queue<FSentAckData>();
+
+    private readonly SequenceHistory _inSeqHistory = new SequenceHistory();
+    private SequenceNumber _inSeq;
+    private SequenceNumber _inAckSeq;
+    private SequenceNumber _inAckSeqAck;
+
+    private SequenceNumber _outSeq;
+    private SequenceNumber _outAckSeq;
+
+    public void Init(SequenceNumber initialInSeq, SequenceNumber initialOutSeq)
+    {
+        _inSeqHistory.Reset();
+        _inSeq = initialInSeq;
+        _inAckSeq = initialInSeq;
+        _inAckSeqAck = initialInSeq;
+        _outSeq = initialOutSeq;
+        _outAckSeq = new SequenceNumber((ushort)(initialOutSeq.Value - 1));
+    }
+
+    public bool ReadHeader(ref FNotificationHeader data, FBitReader reader)
+    {
+        var packedHeader = reader.ReadUInt32();
+
+        data.Seq = FPackedHeader.GetSeq(packedHeader);
+        data.AckedSeq = FPackedHeader.GetAckedSeq(packedHeader);
+        data.HistoryWordCount = FPackedHeader.GetHistoryWordCount(packedHeader) + 1;
+        data.History = new SequenceHistory();
+        data.History.Read(reader, data.HistoryWordCount);
+        
+        return !reader.IsError();
+    }
+
+    public int GetSequenceDelta(FNotificationHeader notificationData)
+    {
+        if (!notificationData.Seq.Greater(_inSeq))
+        {
+            return 0;
+        }
+
+        if (!notificationData.AckedSeq.GreaterEq(_outAckSeq))
+        {
+            return 0;
+        }
+
+        if (!_outSeq.Greater(notificationData.AckedSeq))
+        {
+            return 0;
+        }
+        
+        return SequenceNumber.Diff(notificationData.Seq, _inSeq);
+    }
+
+    public int Update(FNotificationHeader notificationData, HandlePacketNotification func)
+    {
+        var inSeqDelta = GetSequenceDelta(notificationData);
+        if (inSeqDelta > 0)
+        {
+            Logger.Verbose("FNetPacketNotify::Update - Seq {Seq}, InSeq {InSeq}", notificationData.Seq.Value, _inSeq.Value);
+
+            ProcessReceivedAcks(notificationData, func);
+
+            _inSeq = notificationData.Seq;
+            
+            return inSeqDelta;
+        }
+
+        return 0;
+    }
+
+    private void ProcessReceivedAcks(FNotificationHeader notificationData, HandlePacketNotification func)
+    {
+        if (notificationData.AckedSeq.Greater(_outAckSeq))
+        {
+            Logger.Verbose("ProcessReceivedAcks - AckedSeq {AckedSeq}, OutAckSeq {OutAckSeq}", notificationData.AckedSeq.Value, _outAckSeq.Value);
+
+            var ackCount = SequenceNumber.Diff(notificationData.AckedSeq, _outAckSeq);
+
+            // Update InAckSeqAck used to track the needed number of bits to transmit our ack history
+            _inAckSeqAck = UpdateInAckSeqAck(ackCount, notificationData.AckedSeq);
+
+            // ExpectedAck = OutAckSeq + 1
+            var currentAck = new SequenceNumber(_outAckSeq.Value).IncrementAndGet();
+
+            if (ackCount > SequenceHistory.Size)
+            {
+                Logger.Warning("ProcessReceivedAcks - Missed Acks");
+            }
+            
+            // Everything not found in the history buffer is treated as lost
+            while (ackCount > SequenceHistory.Size)
+            {
+                --ackCount;
+                func(currentAck, false);
+                currentAck = currentAck.IncrementAndGet();
+            }
+            
+            // For sequence numbers contained in the history we lookup the delivery status from the history
+            while (ackCount > 0)
+            {
+                --ackCount;
+                func(currentAck, notificationData.History.IsDelivered(ackCount));
+                currentAck = currentAck.IncrementAndGet();
+            }
+
+            _outAckSeq = notificationData.AckedSeq;
+        }
+    }
+
+    private SequenceNumber UpdateInAckSeqAck(int ackCount, SequenceNumber ackedSeq)
+    {
+        if (ackCount <= _ackRecord.Count)
+        {
+            if (ackCount > 1)
+            {
+                for (var i = 0; i < ackCount - 1; i++)
+                {
+                    _ackRecord.Dequeue();
+                }
+            }
+
+            var ackData = _ackRecord.Dequeue();
+            if (ackData.OutSeq.Equals(ackedSeq))
+            {
+                return ackData.InAckSeq;
+            }
+        }
+
+        return new SequenceNumber((ushort)(ackedSeq.Value - MaxSequenceHistoryLength));
+    }
+}

src/Prospect.Unreal/Net/Packets/Header/FNotificationHeader.cs

@@ -0,0 +1,11 @@
+using Prospect.Unreal.Net.Packets.Header.Sequence;
+
+namespace Prospect.Unreal.Net.Packets.Header;
+
+public ref struct FNotificationHeader
+{
+    public SequenceHistory History;
+    public uint HistoryWordCount;
+    public SequenceNumber Seq;
+    public SequenceNumber AckedSeq;
+}

src/Prospect.Unreal/Net/Packets/Header/FPackedHeader.cs

@@ -0,0 +1,27 @@
+using Prospect.Unreal.Net.Packets.Header.Sequence;
+
+namespace Prospect.Unreal.Net.Packets.Header;
+
+public class FPackedHeader
+{
+    public const int HistoryWordCountBits = 4;
+    public const int SeqMask = (1 << FNetPacketNotify.SequenceNumberBits) - 1;
+    public const int HistoryWordCountMask = (1 << HistoryWordCountBits) - 1;
+    public const int AckSeqShift = HistoryWordCountBits;
+    public const int SeqShift = AckSeqShift + FNetPacketNotify.SequenceNumberBits;
+    
+    public static SequenceNumber GetSeq(uint packed)
+    {
+        return new SequenceNumber((ushort)(packed >> SeqShift & SeqMask));
+    }
+
+    public static SequenceNumber GetAckedSeq(uint packed)
+    {
+        return new SequenceNumber((ushort)(packed >> AckSeqShift & SeqMask));
+    }
+
+    public static uint GetHistoryWordCount(uint packed)
+    {
+        return packed & HistoryWordCountMask;
+    }
+}

src/Prospect.Unreal/Net/Packets/Header/Sequence/FSentAckData.cs

@@ -0,0 +1,13 @@
+namespace Prospect.Unreal.Net.Packets.Header.Sequence;
+
+public readonly struct FSentAckData
+{
+    public FSentAckData(SequenceNumber outSeq, SequenceNumber inAckSeq)
+    {
+        OutSeq = outSeq;
+        InAckSeq = inAckSeq;
+    }
+
+    public SequenceNumber OutSeq { get; }
+    public SequenceNumber InAckSeq { get; }
+}

src/Prospect.Unreal/Net/Packets/Header/Sequence/SequenceHistory.cs

@@ -0,0 +1,46 @@
+using Prospect.Unreal.Serialization;
+
+namespace Prospect.Unreal.Net.Packets.Header.Sequence;
+
+public readonly struct SequenceHistory
+{
+    // Hardcoded values for FNetPacketNotify
+    public const uint HistorySize = FNetPacketNotify.MaxSequenceHistoryLength;
+
+    public const uint BitsPerWord = sizeof(uint) * 8;
+    public const uint WordCount = HistorySize / BitsPerWord;
+    public const uint MaxSizeInBits = WordCount * BitsPerWord;
+    public const uint Size = HistorySize;
+
+    private readonly uint[] _storage;
+
+    public SequenceHistory()
+    {
+        _storage = new uint[WordCount];
+    }
+    
+    public void Read(FBitReader reader, uint numWords)
+    {
+        numWords = Math.Min(numWords, WordCount);
+        for (var i = 0; i < numWords; i++)
+        {
+            _storage[i] = reader.ReadUInt32();
+        }
+    }
+
+    public void Reset()
+    {
+        for (var i = 0; i < _storage.Length; i++)
+        {
+            _storage[i] = 0;
+        }
+    }
+
+    public bool IsDelivered(int index)
+    {
+        var wordIndex = (int)(index / BitsPerWord);
+        var wordMask = 1 << (int)(index & (BitsPerWord - 1));
+
+        return (_storage[wordIndex] & wordMask) != 0;
+    }
+}

src/Prospect.Unreal/Net/Packets/Header/Sequence/SequenceNumber.cs

@@ -0,0 +1,70 @@
+namespace Prospect.Unreal.Net.Packets.Header.Sequence;
+
+public readonly struct SequenceNumber
+{
+    // Hardcoded values for FNetPacketNotify
+    public const int NumBits = FNetPacketNotify.SequenceNumberBits;
+
+    public const int SeqNumberBits = NumBits;
+    public const ushort SeqNumberCount = 1 << NumBits;
+    public const ushort SeqNumberHalf = 1 << (NumBits - 1);
+    public const ushort SeqNumberMax = SeqNumberCount - 1;
+    public const ushort SeqNumberMask = SeqNumberMax;
+    
+    public SequenceNumber(ushort value)
+    {
+        Value = (ushort)(value & SeqNumberMask);
+    }
+    
+    public ushort Value { get; }
+
+    public bool Greater(SequenceNumber other)
+    {
+        return (Value != other.Value) && (((Value - other.Value) & SeqNumberMask) < SeqNumberHalf);
+    }
+
+    public bool GreaterEq(SequenceNumber other)
+    {
+        return ((Value - other.Value) & SeqNumberMask) < SeqNumberHalf;
+    }
+
+    public bool Equals(SequenceNumber other)
+    {
+        return Value == other.Value;
+    }
+
+    public override bool Equals(object? obj)
+    {
+        return obj is SequenceNumber other && Equals(other);
+    }
+
+    public override int GetHashCode()
+    {
+        return Value.GetHashCode();
+    }
+
+    public static int Diff(SequenceNumber a, SequenceNumber b)
+    {
+        const int shiftValue = sizeof(int) * 8 - NumBits;
+
+        var valueA = a.Value;
+        var valueB = b.Value;
+
+        return ((valueA - valueB) << shiftValue) >> shiftValue;
+    }
+
+    public SequenceNumber IncrementAndGet()
+    {
+        return new SequenceNumber((ushort)(Value + 1));
+    }
+
+    public readonly struct Difference
+    {
+        public Difference(int value)
+        {
+            Value = value;
+        }
+        
+        public int Value { get; }
+    }
+}

src/Prospect.Unreal/Net/StatelessConnectHandlerComponent.cs

@@ -153,7 +153,53 @@ public class StatelessConnectHandlerComponent : HandlerComponent
 
     public override void Incoming(FBitReader packet)
     {
-        base.Incoming(packet);
+        if (_magicHeader.Length > 0)
+        {
+            // Skip magic header.
+            packet.Pos += _magicHeader.Length;
+        }
+        
+        var bHandshakePacket = packet.ReadBit() && !packet.IsError();
+        if (bHandshakePacket)
+        {
+            var bRestartHandshake = false;
+            var secretId = (byte) 0;
+            var timestamp = 1.0d;
+            Span<byte> cookie = stackalloc byte[CookieByteSize];
+            Span<byte> origCookie = stackalloc byte[CookieByteSize];
+
+            bHandshakePacket = ParseHandshakePacket(packet, ref bRestartHandshake, ref secretId, ref timestamp, cookie, origCookie);
+
+            if (bHandshakePacket)
+            {
+                if (Handler.Mode == HandlerMode.Client)
+                {
+                    throw new NotSupportedException();
+                }
+                else if (Handler.Mode == HandlerMode.Server)
+                {
+                    if (_lastChallengeSuccessAddress != null)
+                    {
+                        // The server should not be receiving handshake packets at this stage - resend the ack in case it was lost.
+                        // In this codepath, this component is linked to a UNetConnection, and the Last* values below, cache the handshake info.
+                        SendChallengeAck(_lastChallengeSuccessAddress, _authorisedCookie);
+                    }
+                }
+            }
+            else
+            {
+                packet.SetError();
+                Logger.Error("Incoming: Error reading handshake packet");
+            }
+        }
+        else if (packet.IsError())
+        {
+            Logger.Error("Incoming: Error reading handshake bit from packet");
+        } 
+        else if (_lastChallengeSuccessAddress != null && Handler.Mode == HandlerMode.Server)
+        {
+            _lastChallengeSuccessAddress = null;
+        }
     }
 
     public override void Outgoing(FBitWriter packet, FOutPacketTraits traits)
@@ -181,14 +227,18 @@ public class StatelessConnectHandlerComponent : HandlerComponent
             var bRestartHandshake = false;
             var secretId = (byte) 0;
             var timestamp = 1.0d;
-            var cookie = new byte[CookieByteSize];
+            Span<byte> cookie = stackalloc byte[CookieByteSize];
-            var origCookie = new byte[CookieByteSize];
+            Span<byte> origCookie = stackalloc byte[CookieByteSize];
 
             bHandshakePacket = ParseHandshakePacket(packet, ref bRestartHandshake, ref secretId, ref timestamp, cookie, origCookie);
 
             if (bHandshakePacket)
             {
-                if (Handler.Mode == HandlerMode.Server)
+                if (Handler.Mode == HandlerMode.Client)
+                {
+                    throw new NotSupportedException();
+                }
+                else if (Handler.Mode == HandlerMode.Server)
                 {
                     var bInitialConnect = timestamp == 0.0;
                     if (bInitialConnect)
@@ -206,7 +256,7 @@ public class StatelessConnectHandlerComponent : HandlerComponent
                         if (bValidCookieLifetime && bValidSecretIdTimestamp)
                         {
                             // Regenerate the cookie from the packet info, and see if the received cookie matches the regenerated one
-                            var regenCookie = new byte[CookieByteSize];
+                            Span<byte> regenCookie = stackalloc byte[CookieByteSize];
                             
                             GenerateCookie(address, secretId, timestamp, regenCookie);
 
@@ -216,16 +266,17 @@ public class StatelessConnectHandlerComponent : HandlerComponent
                             {
                                 if (bRestartHandshake)
                                 {
-                                    Buffer.BlockCopy(origCookie, 0, _authorisedCookie, 0, _authorisedCookie.Length);
+                                    origCookie.CopyTo(_authorisedCookie);
                                 }
                                 else
                                 {
-                                    var curSequence = BinaryPrimitives.ReadInt16LittleEndian(cookie);
+                                    var seqA = BinaryPrimitives.ReadInt16LittleEndian(cookie);
+                                    var seqB = BinaryPrimitives.ReadInt16LittleEndian(cookie.Slice(2));
 
-                                    _lastServerSequence = curSequence & (UNetConnection.MaxPacketId - 1);
+                                    _lastServerSequence = seqA & (UNetConnection.MaxPacketId - 1);
-                                    _lastClientSequence = (curSequence + 1) & (UNetConnection.MaxPacketId - 1);
+                                    _lastClientSequence = seqB & (UNetConnection.MaxPacketId - 1);
                                     
-                                    Buffer.BlockCopy(cookie, 0, _authorisedCookie, 0, _authorisedCookie.Length);
+                                    cookie.CopyTo(_authorisedCookie);
                                 }
 
                                 _bRestartedHandshake = bRestartHandshake;
@@ -262,7 +313,7 @@ public class StatelessConnectHandlerComponent : HandlerComponent
         FBitReader packet, 
         ref bool bOutRestartHandshake, 
         ref byte outSecretId,
-        ref double outTimestamp, byte[] outCookie, byte[] outOrigCookie)
+        ref double outTimestamp, Span<byte> outCookie, Span<byte> outOrigCookie)
     {
         var bValidPacket = false;
         var bitsLeft = packet.GetBitsLeft();
@@ -314,7 +365,7 @@ public class StatelessConnectHandlerComponent : HandlerComponent
         var bHandshakePacket = (byte)1;
         var bRestartHandshake = (byte)0;
         var timestamp = _driver.GetElapsedTime();
-        var cookie = new byte[CookieByteSize];
+        Span<byte> cookie = stackalloc byte[CookieByteSize];
 
         GenerateCookie(address, _activeSecret, timestamp, cookie);
 
@@ -329,7 +380,7 @@ public class StatelessConnectHandlerComponent : HandlerComponent
         challengePacket.WriteDouble(timestamp);
         challengePacket.Serialize(cookie, cookie.Length);
         
-        Logger.Verbose("SendConnectChallenge. Timestamp: {Timestamp}, Cookie: {Cookie}", timestamp, cookie);
+        Logger.Verbose("SendConnectChallenge. Timestamp: {Timestamp}, Cookie: {Cookie}", timestamp, Convert.ToHexString(cookie));
 
         CapHandshakePacket(challengePacket);
 

src/Prospect.Unreal/Net/UChannel.cs

@@ -0,0 +1,8 @@
+using Prospect.Unreal.Core.Names;
+
+namespace Prospect.Unreal.Net;
+
+public class UChannel
+{
+    public FName ChName { get; }
+}

src/Prospect.Unreal/Net/UIpConnection.cs

@@ -6,20 +6,46 @@ namespace Prospect.Unreal.Net;
 
 public class UIpConnection : UNetConnection
 {
+    public const int IpHeaderSize = 20;
+    public const int UdpHeaderSize = IpHeaderSize + 8;
+
+    /// <summary>
+    ///     Cached time of the first send socket error that will be used to compute disconnect delay.
+    /// </summary>
+    private double _socketErrorSendDelayStartTime;
+    
+    /// <summary>
+    ///     Cached time of the first recv socket error that will be used to compute disconnect delay.
+    /// </summary>
+    private double _socketErrorRecvDelayStartTime;
+    
+    public UdpClient? Socket { get; private set; }
+    
     public override void InitBase(UNetDriver inDriver, UdpClient inSocket, FUrl inURL, EConnectionState inState, int inMaxPacket = 0, int inPacketOverhead = 0)
     {
-        throw new NotImplementedException();
+        base.InitBase(inDriver, inSocket, inURL, inState, 
+            (inMaxPacket == 0 || inMaxPacket > MaxPacketSize) ? MaxPacketSize : inMaxPacket, 
+            inPacketOverhead == 0 ? UdpHeaderSize : inPacketOverhead);
+        
+        Socket = inSocket;
     }
 
     public override void InitRemoteConnection(UNetDriver inDriver, UdpClient inSocket, FUrl inURL, IPEndPoint inRemoteAddr, EConnectionState inState, int inMaxPacket = 0, int inPacketOverhead = 0)
     {
-        throw new NotImplementedException();
+        InitBase(inDriver, inSocket, inURL, inState, 
+            (inMaxPacket == 0 || inMaxPacket > MaxPacketSize) ? MaxPacketSize : inMaxPacket, 
+            inPacketOverhead == 0 ? UdpHeaderSize : inPacketOverhead);
+
+        RemoteAddr = inRemoteAddr;
+        Url.Host = RemoteAddr.Address;
+
+        SetClientLoginState(EClientLoginState.LoggingIn);
+        SetExpectedClientLoginMsgType(0); // TODO: NMT_HELLO
     }
 
-    public override void InitLocalConnection(UNetDriver inDriver, UdpClient inSocket, FUrl inURL, EConnectionState inState,
+    public override void InitLocalConnection(UNetDriver inDriver, UdpClient inSocket, FUrl inURL, EConnectionState inState, int inMaxPacket = 0, int inPacketOverhead = 0)
-        int inMaxPacket = 0, int inPacketOverhead = 0)
     {
-        throw new NotImplementedException();
+        throw new NotSupportedException();
     }
 
     public override void LowLevelSend(byte[] data, int countBits, FOutPacketTraits traits)
@@ -47,9 +73,11 @@ public class UIpConnection : UNetConnection
         throw new NotImplementedException();
     }
 
-    public override void ReceivedRawPacket(byte[] data, int count)
+    public override void ReceivedRawPacket(FReceivedPacketView packetView)
     {
-        throw new NotImplementedException();
+        _socketErrorRecvDelayStartTime = 0;
+        
+        base.ReceivedRawPacket(packetView);
     }
 
     public override float GetTimeoutValue()

src/Prospect.Unreal/Net/UIpNetDriver.cs

@@ -54,18 +54,26 @@ public class UIpNetDriver : UNetDriver
                 MappedClientConnections.TryGetValue(packet.Address, out connection);
             }
 
+            var bIgnorePacket = false;
+            
             // If we didn't find a client connection, maybe create a new one.
             if (connection == null)
             {
                 connection = ProcessConnectionlessPacket(packet);
-                // TODO: bIgnorePacket
+                bIgnorePacket = packet.DataView.NumBytes() == 0;
+            }
+            
+            // Send the packet to the connection for processing.
+            if (connection != null && !bIgnorePacket)
+            {
+                connection.ReceivedRawPacket(packet);
             }
         }
     }
 
     private UNetConnection? ProcessConnectionlessPacket(FReceivedPacketView packet)
     {
-        UNetConnection? returnVal;
+        UNetConnection? returnVal = null;
         var statelessConnect = StatelessConnectComponent;
         var address = packet.Address;
         var bPassedChallenge = false;
@@ -95,7 +103,7 @@ public class UIpNetDriver : UNetDriver
                         bIgnorePacket = false;
                     }
 
-                    packet.DataView = new FPacketDataView(workingData, newCountBytes);
+                    packet.DataView = new FPacketDataView(workingData, newCountBytes, ECountUnits.Bytes);
                 }
             }
         }
@@ -121,7 +129,12 @@ public class UIpNetDriver : UNetDriver
 
                 returnVal.InitRemoteConnection(this, Socket, World != null ? World.Url : new FUrl(), address, EConnectionState.USOCK_Open);
 
-                // if (returnVal.Handler)
+                if (returnVal.Handler != null)
+                {
+                    returnVal.Handler.BeginHandshaking();
+                }
+
+                AddClientConnection(returnVal);
             }
 
             if (statelessConnect != null)
@@ -132,10 +145,10 @@ public class UIpNetDriver : UNetDriver
 
         if (bIgnorePacket)
         {
-            packet.DataView = new FPacketDataView(packet.DataView.GetData(), 0);
+            packet.DataView = new FPacketDataView(packet.DataView.GetData(), 0, ECountUnits.Bits);
         }
         
-        return null;
+        return returnVal;
     }
 
     public override void LowLevelSend(IPEndPoint address, byte[] data, int countBits, FOutPacketTraits traits)

src/Prospect.Unreal/Net/UNetConnection.cs

@@ -1,15 +1,193 @@
 using System.Net;
 using System.Net.Sockets;
 using Prospect.Unreal.Core;
+using Prospect.Unreal.Core.Names;
+using Prospect.Unreal.Exceptions;
+using Prospect.Unreal.Net.Channels;
+using Prospect.Unreal.Net.Packets.Bunch;
+using Prospect.Unreal.Net.Packets.Header;
+using Prospect.Unreal.Net.Packets.Header.Sequence;
+using Prospect.Unreal.Serialization;
+using Serilog;
 
 namespace Prospect.Unreal.Net;
 
 public abstract class UNetConnection
 {
+    private static readonly ILogger Logger = Log.ForContext<UNetConnection>();
+    
     public const int ReliableBuffer = 256;
     public const int MaxPacketId = 16384;
+    public const int MaxChSequence = 1024;
+    public const int MaxBunchHeaderBits = 256;
+    public const int MaxPacketSize = 1024;
+
+    public const int DefaultMaxChannelSize = 32767;
+
+    public const int MaxJitterClockTimeValue = 1023;
+    public const int NumBitsForJitterClockTimeInHeader = 10;
+
+    public const EEngineNetworkVersionHistory DefaultEngineNetworkProtocolVersion = EEngineNetworkVersionHistory.HISTORY_ENGINENETVERSION_LATEST;
+    public const uint DefaultGameNetworkProtocolVersion = 0;
+
+    private List<FBitReader>? _packetOrderCache;
+    private int _packetOrderCacheStartIdx;
+    private int _packetOrderCacheCount;
+    private bool _bFlushingPacketOrderCache;
+    
+    private bool _bInternalAck;
+    private bool _bReplay;
+
+    public UNetConnection()
+    {
+        _packetOrderCache = null;
+        _packetOrderCacheStartIdx = 0;
+        _packetOrderCacheCount = 0;
+        _bFlushingPacketOrderCache = false;
+        _bInternalAck = false;
+        _bReplay = false;
+        
+        Driver = null;
+        PackageMap = null;
+        MaxPacket = 0;
+        Url = new FUrl();
+        RemoteAddr = new IPEndPoint(IPAddress.None, 0);
+        State = EConnectionState.USOCK_Invalid;
+        Handler = null;
+        ClientLoginState = EClientLoginState.Invalid;
+        ExpectedClientLoginMsgType = 0;
+        PacketOverhead = 0;
+        InPacketId = -1;
+        OutPacketId = 0;
+        OutAckPacketId = -1;
+        MaxChannelSize = DefaultMaxChannelSize;
+        Channels = new UChannel[DefaultMaxChannelSize];
+        OutReliable = new int[DefaultMaxChannelSize];
+        InReliable = new int[DefaultMaxChannelSize];
+        PendingOutRec = new int[DefaultMaxChannelSize];
+
+        EngineNetworkProtocolVersion = DefaultEngineNetworkProtocolVersion;
+        GameNetworkProtocolVersion = DefaultGameNetworkProtocolVersion;
+        
+        PacketNotify = new FNetPacketNotify();
+        PacketNotify.Init(
+            new SequenceNumber((ushort)InPacketId), 
+            new SequenceNumber((ushort)OutPacketId));
+    }
+    
+    /// <summary>
+    ///     Owning net driver
+    /// </summary>
+    public UNetDriver? Driver { get; private set; }
+    
+    /// <summary>
+    ///     Package map between local and remote. (negotiates net serialization)
+    /// </summary>
+    public UPackageMapClient? PackageMap { get; private set; }
+    
+    /// <summary>
+    ///     Maximum packet size.
+    /// </summary>
+    public int MaxPacket { get; private set; }
+    
+    /// <summary>
+    ///     URL of the other side.
+    /// </summary>
+    public FUrl Url { get; }
+    
+    /// <summary>
+    ///     The remote address of this connection, typically generated from the URL.
+    /// </summary>
+    public IPEndPoint? RemoteAddr { get; protected set; }
+    
+    /// <summary>
+    ///     State this connection is in.
+    /// </summary>
+    public EConnectionState State { get; private set; }
+    
+    /// <summary>
+    ///     PacketHandler, for managing layered handler components, which modify packets as they are sent/received
+    /// </summary>
+    public PacketHandler? Handler { get; private set; }
+    
+    public EClientLoginState ClientLoginState { get; private set; }
+    
+    /// <summary>
+    ///     Used to determine what the next expected control channel msg type should be from a connecting client
+    /// </summary>
+    public byte ExpectedClientLoginMsgType { get; private set; }
+    
+    /// <summary>
+    ///     Reference to the PacketHandler component, for managing stateless connection handshakes
+    /// </summary>
+    public StatelessConnectHandlerComponent? StatelessConnectComponent { get; private set; }
+    
+    /// <summary>
+    ///     Bytes overhead per packet sent.
+    /// </summary>
+    public int PacketOverhead { get; private set; }
+    
+    /// <summary>
+    ///     Full incoming packet index.
+    /// </summary>
+    public int InPacketId { get; private set; }
+    
+    /// <summary>
+    ///     Most recently sent packet.
+    /// </summary>
+    public int OutPacketId { get; private set; }
+    
+    /// <summary>
+    ///     Most recently acked outgoing packet.
+    /// </summary>
+    public int OutAckPacketId { get; private set; }
+    
+    public bool LastHasServerFrameTime { get; private set; }
+    
+    /// <summary>
+    ///     Full PacketId  of last sent packet that we have received notification for (i.e. we know if it was delivered or not).
+    ///     Related to OutAckPacketId which is tha last successfully delivered PacketId.
+    /// </summary>
+    public int LastNotifiedPacketId { get; private set; }
+
+    public int MaxChannelSize { get; }
+    public UChannel?[] Channels { get; }
+    public int[] OutReliable { get; }
+    public int[] InReliable { get; }
+    public int[] PendingOutRec { get; }
+    public int InitOutReliable { get; private set; }
+    public int InitInReliable { get; private set; }
+    
+    public EEngineNetworkVersionHistory EngineNetworkProtocolVersion { get; private set; }
+    public uint GameNetworkProtocolVersion { get; private set; }
+    
+    public FNetPacketNotify PacketNotify { get; }
+
+    public virtual void InitBase(UNetDriver inDriver, UdpClient inSocket, FUrl inURL, EConnectionState inState, int inMaxPacket = 0, int inPacketOverhead = 0)
+    {
+        Driver = inDriver;
+        
+        // TODO: ConnectionId
+
+        State = inState;
+
+        Url.Protocol = inURL.Protocol;
+        Url.Host = inURL.Host;
+        Url.Port = inURL.Port;
+        Url.Map = inURL.Map;
+        Url.RedirectUrl = inURL.RedirectUrl;
+        Url.Options = inURL.Options;
+        Url.Portal = inURL.Portal;
+
+        MaxPacket = inMaxPacket;
+        PacketOverhead = inPacketOverhead;
+
+        InitHandler();
+
+        PackageMap = new UPackageMapClient();
+        PackageMap.Initialize(this, Driver.GuidCache);
+    }
 
-    public abstract void InitBase(UNetDriver inDriver, UdpClient inSocket, FUrl inURL, EConnectionState inState, int inMaxPacket = 0, int inPacketOverhead = 0);
     public abstract void InitRemoteConnection(UNetDriver inDriver, UdpClient inSocket, FUrl inURL, IPEndPoint inRemoteAddr, EConnectionState inState, int inMaxPacket = 0, int inPacketOverhead = 0);
     public abstract void InitLocalConnection(UNetDriver inDriver, UdpClient inSocket, FUrl inURL, EConnectionState inState, int inMaxPacket = 0, int inPacketOverhead = 0);
     public abstract void LowLevelSend(byte[] data, int countBits, FOutPacketTraits traits);
@@ -17,11 +195,491 @@ public abstract class UNetConnection
     public abstract string LowLevelDescribe();
     public abstract void Tick(float deltaSeconds);
     public abstract void CleanUp();
-    public abstract void ReceivedRawPacket(byte[] data, int count);
+
+    public virtual void ReceivedRawPacket(FReceivedPacketView packetView)
+    {
+        if (Handler != null)
+        {
+            var result = Handler.Incoming(packetView);
+            if (result)
+            {
+                if (packetView.DataView.NumBytes() == 0)
+                {
+                    return;
+                }
+            }
+            else
+            {
+                // TODO: Close connection, malformed packet.
+                Logger.Fatal("Connection should be closed here");
+                return;
+            }
+        }
+
+        // Handle an incoming raw packet from the driver.
+        if (packetView.DataView.NumBytes() > 0)
+        {
+            var data = packetView.DataView.GetData();
+            var count = packetView.DataView.NumBytes();
+            
+            var lastByte = data[count - 1];
+            if (lastByte != 0)
+            {
+                var bitSize = (count * 8) - 1;
+
+                // Bit streaming, starts at the Least Significant Bit, and ends at the MSB.
+                while ((lastByte & 0x80) == 0)
+                {
+                    lastByte *= 2;
+                    bitSize--;
+                }
+                
+                var reader = new FBitReader(data, bitSize);
+                
+                reader.SetEngineNetVer(EngineNetworkProtocolVersion);
+                reader.SetGameNetVer(GameNetworkProtocolVersion);
+
+                if (Handler != null)
+                {
+                    Handler.IncomingHigh(reader);
+                }
+
+                if (reader.GetBitsLeft() > 0)
+                {
+                    ReceivedPacket(reader);
+                    
+                    // TODO: Flush out of order cache
+                }
+            }
+        }
+    }
+
+    private void ReceivedPacket(FBitReader reader, bool bIsReinjectedPacket = false)
+    {
+        if (reader.IsError())
+        {
+            Logger.Error("Packet too small");
+            return;
+        }
+
+        var resetReaderMark = new FBitReaderMark(reader);
+
+        if (_bInternalAck)
+        {
+            ++InPacketId;
+        }
+        else
+        {
+            // Read packet header.
+            var header = new FNotificationHeader();
+
+            if (!PacketNotify.ReadHeader(ref header, reader))
+            {
+                // TODO: Close connection, malformed packet.
+                Logger.Fatal("Failed to read PacketHeader");
+                return;
+            }
+
+            var bHasPacketInfoPayload = true;
+            
+            if (reader.EngineNetVer() > EEngineNetworkVersionHistory.HISTORY_JITTER_IN_HEADER)
+            {
+                bHasPacketInfoPayload = reader.ReadBit();
+                
+                if (bHasPacketInfoPayload)
+                {
+                    var bitsReadPreJitterClock = reader.GetPosBits();
+                
+                    var packetJitterClockTimeMs = reader.ReadInt(MaxJitterClockTimeValue + 1);
+
+                    if (reader.GetPosBits() - bitsReadPreJitterClock != NumBitsForJitterClockTimeInHeader)
+                    {
+                        throw new UnrealNetException("JitterClockTime did not read the expected amount of bits");
+                    }
+                
+                    if (!bIsReinjectedPacket)
+                    {
+                        ProcessJitter(packetJitterClockTimeMs);
+                    }
+                }
+            }
+
+            var packetSequenceDelta = PacketNotify.GetSequenceDelta(header);
+            if (packetSequenceDelta > 0)
+            {
+                var bPacketOrderCacheActive = !_bFlushingPacketOrderCache && _packetOrderCache != null;
+                var bCheckForMissingSequence = bPacketOrderCacheActive && _packetOrderCacheCount == 0;
+                var bFillingPacketOrderCache = bPacketOrderCacheActive && _packetOrderCacheCount > 0;
+
+                const int maxMissingPackets = 0; // CVarNetPacketOrderMaxMissingPackets
+                var missingPacketCount = packetSequenceDelta - 1;
+                
+                // Cache the packet if we are already caching, and begin caching if we just encountered a missing sequence, within range
+                if (bFillingPacketOrderCache || (bCheckForMissingSequence && missingPacketCount > 0 && missingPacketCount <= maxMissingPackets))
+                {
+                    throw new NotImplementedException();
+                }
+
+                if (missingPacketCount > 10)
+                {
+                    Logger.Verbose("High single frame packet loss, PacketsLost: {Amount}", missingPacketCount);
+                }
+                
+                // TODO: Increment things
+            }
+            else
+            {
+                // TODO: Increment things
+                // TODO: PacketOrderCache
+                return;
+            }
+
+            // Update incoming sequence data and deliver packet notifications
+            // Packet is only accepted if both the incoming sequence number and incoming ack data are valid
+            PacketNotify.Update(header, (ackedSequence, delivered) =>
+            {
+                // TODO: Increment things
+
+                if (!new SequenceNumber((ushort)LastNotifiedPacketId).Equals(ackedSequence))
+                {
+                    // TODO: Close connection.
+                    Logger.Fatal("LastNotifiedPacketId != AckedSequence");
+                    return;
+                }
+
+                if (delivered)
+                {
+                    // ReceivedAck(LastNotifiedPacketId, ChannelsToClose)
+                    Logger.Verbose("TODO: ReceivedAck");
+                }
+                else
+                {
+                    // ReceivedNak(LastNotifiedPacketId)
+                    Logger.Verbose("TODO: ReceivedNak");
+                }
+            });
+            
+            // Extra information associated with the header (read only after acks have been processed)
+            if (packetSequenceDelta > 0 && !ReadPacketInfo(reader, bHasPacketInfoPayload))
+            {
+                // TODO: Close connection.
+                Logger.Fatal("Failed to read PacketHeader");
+                return;
+            }
+        }
+
+        var bIgnoreRPCS = Driver!.ShouldIgnoreRPCs();
+        var bSickAcp = false;
+        
+        // Track channels that were rejected while processing this packet - used to avoid sending multiple close-channel bunches,
+        // which would cause a disconnect serverside
+        var rejectedChans = new List<int>();
+        
+            
+        // Disassemble and dispatch all bunches in the packet.
+        while (!reader.AtEnd() && State != EConnectionState.USOCK_Closed)
+        {
+            if (_bInternalAck && EngineNetworkProtocolVersion < EEngineNetworkVersionHistory.HISTORY_ACKS_INCLUDED_IN_HEADER)
+            {
+                _ = reader.ReadBit();
+            }
+                
+            // Parse the bunch.
+            var startPos = reader.GetPosBits();
+            
+            // Process Received data
+            {
+                // Parse the incoming data.
+                var bunch = new FInBunch(this);
+
+                var incomingStartPos = reader.GetPosBits();
+
+                var bControl = reader.ReadBit();
+
+                bunch.PacketId = InPacketId;
+                bunch.bOpen = bControl && reader.ReadBit();
+                bunch.bClose = bControl && reader.ReadBit();
+
+                if (bunch.EngineNetVer() < EEngineNetworkVersionHistory.HISTORY_CHANNEL_CLOSE_REASON)
+                {
+                    bunch.bDormant = bunch.bClose && reader.ReadBit();
+                    bunch.CloseReason = bunch.bDormant
+                        ? EChannelCloseReason.Dormancy
+                        : EChannelCloseReason.Destroyed;
+                }
+                else
+                {
+                    bunch.CloseReason = bunch.bClose
+                        ? (EChannelCloseReason)reader.ReadInt((uint)EChannelCloseReason.MAX)
+                        : EChannelCloseReason.Destroyed;
+                    bunch.bDormant = bunch.CloseReason == EChannelCloseReason.Dormancy;
+                }
+
+                bunch.bIsReplicationPaused = reader.ReadBit();
+                bunch.bReliable = reader.ReadBit();
+
+                if (bunch.EngineNetVer() < EEngineNetworkVersionHistory.HISTORY_MAX_ACTOR_CHANNELS_CUSTOMIZATION)
+                {
+                    const int oldMaxActorChannels = 10240;
+                    bunch.ChIndex = (int)reader.ReadInt(oldMaxActorChannels);
+                }
+                else
+                {
+                    bunch.ChIndex = (int)reader.ReadUInt32Packed();
+
+                    if (bunch.ChIndex >= MaxChannelSize)
+                    {
+                        throw new Exception("Bunch channel index exceeds channel limit");
+                    }
+                }
+                
+                // if flag is set, remap channel index values, we're fast forwarding a replay checkpoint
+                // and there should be no bunches for existing channels
+                if (_bInternalAck /* && bAllowExistingChannelIndex */ && (bunch.EngineNetVer() >= EEngineNetworkVersionHistory.HISTORY_REPLAY_DORMANCY))
+                {
+                    throw new NotSupportedException("Replay code");
+                }
+
+                bunch.bHasPackageMapExports = reader.ReadBit();
+                bunch.bHasMustBeMappedGUIDs = reader.ReadBit();
+                bunch.bPartial = reader.ReadBit();
+
+                if (bunch.bReliable)
+                {
+                    if (_bInternalAck)
+                    {
+                        // We can derive the sequence for 100% reliable connections.
+                        bunch.ChSequence = InReliable[bunch.ChIndex] + 1;
+                    }
+                    else
+                    {
+                        bunch.ChSequence = MakeRelative((int)reader.ReadInt(MaxChSequence), InReliable[bunch.ChIndex], MaxChSequence);
+                    }
+                }
+                else if (bunch.bPartial)
+                {
+                    // If this is an unreliable partial bunch, we simply use packet sequence since we already have it
+                    bunch.ChSequence = InPacketId;
+                }
+                else
+                {
+                    bunch.ChSequence = 0;
+                }
+
+                bunch.bPartialInitial = bunch.bPartial && reader.ReadBit();
+                bunch.bPartialFinal = bunch.bPartial && reader.ReadBit();
+                
+                if (bunch.EngineNetVer() < EEngineNetworkVersionHistory.HISTORY_CHANNEL_NAMES)
+                {
+                    bunch.ChType = (bunch.bReliable || bunch.bOpen) ? (int) reader.ReadInt(EChannelType.CHTYPE_MAX) : EChannelType.CHTYPE_None;
+
+                    switch (bunch.ChType)
+                    {
+                        case EChannelType.CHTYPE_Control:
+                            bunch.ChName = UnrealNames.FNames[UnrealNameKey.Control];
+                            break;
+                        case EChannelType.CHTYPE_Voice:
+                            bunch.ChName = UnrealNames.FNames[UnrealNameKey.Voice];
+                            break;
+                        case EChannelType.CHTYPE_Actor:
+                            bunch.ChName = UnrealNames.FNames[UnrealNameKey.Actor];
+                            break;
+                    }
+                }
+                else
+                {
+                    if (bunch.bReliable || bunch.bOpen)
+                    {
+                        if (!UPackageMap.StaticSerializeName(reader, out var chName) || reader.IsError())
+                        {
+                            // TODO: Close connection
+                            Logger.Fatal("Channel name serialization failed");
+                            return;
+                        }
+                            
+                        bunch.ChName = chName;
+                        
+                        switch ((UnrealNameKey) bunch.ChName.Number)
+                        {
+                            case UnrealNameKey.Control:
+                                bunch.ChType = EChannelType.CHTYPE_Control;
+                                break;
+                                
+                            case UnrealNameKey.Voice:
+                                bunch.ChType = EChannelType.CHTYPE_Voice;
+                                break;
+                                
+                            case UnrealNameKey.Actor:
+                                bunch.ChType = EChannelType.CHTYPE_Actor;
+                                break;
+                        }
+                    }
+                    else
+                    {
+                        bunch.ChType = EChannelType.CHTYPE_None;
+                        bunch.ChName = UnrealNames.FNames[UnrealNameKey.None];
+                    }
+                }
+                    
+                var channel = Channels[bunch.ChIndex];
+
+                // If there's an existing channel and the bunch specified it's channel type, make sure they match.
+                if (channel != null &&
+                    (bunch.ChName.Number != (int)UnrealNameKey.None) &&
+                    (bunch.ChName.Number != channel.ChName.Number))
+                {
+                    Logger.Error("Existing channel at index {ChIndex} with type \"{ChName}\" differs from the incoming bunch's expected channel type, \"{BunchChName}\"", 
+                        bunch.ChIndex, channel.ChName.Str, bunch.ChName.Str);
+                    // TODO: Close();
+                    return;
+                }
+            }
+        }
+
+        throw new NotImplementedException();
+    }
+
+    private bool ReadPacketInfo(FBitReader reader, bool bHasPacketInfoPayload)
+    {
+        if (!bHasPacketInfoPayload)
+        {
+            var bCanContinueReading = reader.IsError() == false;
+            return bCanContinueReading;
+        }
+
+        var bHasServerFrameTime = reader.ReadBit();
+        var serverFrameTime = 0.0d;
+
+        if (!Driver!.IsServer())
+        {
+            throw new NotImplementedException("Client code");
+        }
+        else
+        {
+            LastHasServerFrameTime = bHasServerFrameTime;
+        }
+
+        if (reader.EngineNetVer() < EEngineNetworkVersionHistory.HISTORY_JITTER_IN_HEADER)
+        {
+            // RemoteInKBytesPerSecondByte
+            reader.ReadByte();
+        }
+
+        if (reader.IsError())
+        {
+            return false;
+        }
+        
+        // TODO: Update ping, lag measuring
+
+        return true;
+    }
+
+    private void ProcessJitter(uint packetJitterClockTimeMs)
+    {
+        if (packetJitterClockTimeMs >= MaxJitterClockTimeValue)
+        {
+            return;
+        }
+        
+        Logger.Verbose("Jitter calculations missing");
+    }
+
     public abstract float GetTimeoutValue();
 
-    public void InitSequence(int clientSequence, int serverSequence)
+    public void InitSequence(int incomingSequence, int outgoingSequence)
     {
+        if (InPacketId == -1)
+        {
+            // Initialize the base UNetConnection packet sequence (not very useful/effective at preventing attacks)
+            InPacketId = incomingSequence - 1;
+            OutPacketId = outgoingSequence;
+            OutAckPacketId = outgoingSequence - 1;
+            LastNotifiedPacketId = OutAckPacketId;
 
+            // Initialize the reliable packet sequence (more useful/effective at preventing attacks)
+            InitInReliable = incomingSequence & (MaxChSequence - 1);
+            InitOutReliable = outgoingSequence & (MaxChSequence - 1);
+            
+            for (var i = 0; i < InReliable.Length; i++)
+            {
+                InReliable[i] = InitInReliable;
+            }
+
+            for (var i = 0; i < OutReliable.Length; i++)
+            {
+                OutReliable[i] = InitOutReliable;
+            }
+
+            PacketNotify.Init(
+                new SequenceNumber((ushort)InPacketId),
+                new SequenceNumber((ushort)OutPacketId));
+            
+            Logger.Verbose("InitSequence: IncomingSequence: {SeqA}, OutgoingSequence: {SeqB}", incomingSequence, outgoingSequence);
+            Logger.Verbose("InitSequence: InitInReliable: {In}, InitOutReliable: {Out}", InitInReliable, InitOutReliable);
+        }
+    }
+
+    private void InitHandler()
+    {
+        if (Handler != null)
+        {
+            return;
+        }
+
+        if (Driver == null)
+        {
+            throw new UnrealNetException("Driver was null");
+        }
+        
+        Handler = new PacketHandler();
+        Handler.Initialize(false);
+        
+        StatelessConnectComponent = (StatelessConnectHandlerComponent) Handler.AddHandler<StatelessConnectHandlerComponent>();
+        StatelessConnectComponent.SetDriver(Driver);
+
+        Handler.InitializeComponents();
+    }
+
+    public void CreateChannelByName(string chName, EChannelCreateFlags createFlags, int channelIndex)
+    {
+        // TODO: Implement
+        Logger.Verbose("Creating channel {Name} with index {Index}", chName, channelIndex);
+    }
+
+    private protected void SetClientLoginState(EClientLoginState newState)
+    {
+        if (ClientLoginState == newState)
+        {
+            Logger.Verbose("SetClientLoginState: State same: {Old}", newState);
+            return;
+        }
+        
+        Logger.Verbose("SetClientLoginState: State changing from {Old} to {New}", ClientLoginState, newState);
+
+        ClientLoginState = newState;
+    }
+
+    private protected void SetExpectedClientLoginMsgType(byte newType)
+    {
+        if (ExpectedClientLoginMsgType == newType)
+        {
+            Logger.Verbose("SetExpectedClientLoginMsgType: Type same: [{Old}]", newType);
+            return;
+        }
+        
+        Logger.Verbose("SetExpectedClientLoginMsgType: Type changing from [{Old}] to [{New}]", ExpectedClientLoginMsgType, newType);
+
+        ExpectedClientLoginMsgType = newType;
+    }
+
+    private static int BestSignedDifference(int value, int reference, int max)
+    {
+        return ((value - reference + max / 2) & (max - 1)) - max / 2;
+    }
+
+    private static int MakeRelative(int value, int reference, int max)
+    {
+        return reference + BestSignedDifference(value, reference, max);
     }
 }

src/Prospect.Unreal/Net/UNetDriver.cs

@@ -1,5 +1,6 @@
 using System.Collections.Concurrent;
 using System.Net;
+using Prospect.Unreal.Net.Channels;
 using Prospect.Unreal.Runtime;
 
 namespace Prospect.Unreal.Net;
@@ -10,6 +11,15 @@ public abstract class UNetDriver : IAsyncDisposable
     
     protected UNetDriver()
     {
+        GuidCache = new FNetGUIDCache(this);
+        // TODO: Load from Engine ini
+        ChannelDefinitions = new List<FChannelDefinition>
+        {
+            new FChannelDefinition("Control", typeof(string), 0, true, false, true, false, true),
+            new FChannelDefinition("Voice", typeof(string), 1, true, true, true, true, true),
+            new FChannelDefinition("Actor", typeof(string), -1, false, true, false, false, false)
+        };
+        ClientConnections = new List<UNetConnection>();
         MappedClientConnections = new ConcurrentDictionary<IPEndPoint, UNetConnection>();
     }
     
@@ -18,6 +28,18 @@ public abstract class UNetDriver : IAsyncDisposable
     /// </summary>
     public UWorld? World { get; private set; }
     
+    public FNetGUIDCache GuidCache { get; }
+    
+    /// <summary>
+    ///     Used to specify available channel types and their associated UClass
+    /// </summary>
+    public List<FChannelDefinition> ChannelDefinitions { get; } 
+
+    /// <summary>
+    ///     Array of connections to clients (this net driver is a host) - unsorted, and ordering changes depending on actor replication
+    /// </summary>
+    public List<UNetConnection> ClientConnections { get; }
+
     /// <summary>
     ///     Map of <see cref="IPEndPoint"/> to <see cref="UNetConnection"/>.
     /// </summary>
@@ -76,6 +98,16 @@ public abstract class UNetDriver : IAsyncDisposable
         }
     }
 
+    public bool IsServer()
+    {
+        return true;
+    }
+
+    public virtual bool ShouldIgnoreRPCs()
+    {
+        return false;
+    }
+    
     public double GetElapsedTime()
     {
         return _elapsedTime;
@@ -86,6 +118,33 @@ public abstract class UNetDriver : IAsyncDisposable
         _elapsedTime = 0.0;
     }
 
+    private protected void AddClientConnection(UNetConnection newConnection)
+    {
+        ClientConnections.Add(newConnection);
+
+        if (newConnection.RemoteAddr != null)
+        {
+            MappedClientConnections[newConnection.RemoteAddr] = newConnection;
+            
+            // TODO: RecentlyDisconnectedClients ?
+        }
+
+        CreateInitialServerChannels(newConnection);
+
+        // TODO: NetworkObjectList > HandleConnectionAdded
+    }
+
+    private void CreateInitialServerChannels(UNetConnection clientConnection)
+    {
+        foreach (var channelDef in ChannelDefinitions)
+        {
+            if (channelDef.InitialServer)
+            {
+                clientConnection.CreateChannelByName(channelDef.Name, EChannelCreateFlags.OpenedLocally, channelDef.StaticChannelIndex);
+            }
+        }
+    }
+
     public virtual ValueTask DisposeAsync()
     {
         return ValueTask.CompletedTask;

src/Prospect.Unreal/Net/UPackageMap.cs

@@ -0,0 +1,56 @@
+using System.Diagnostics.CodeAnalysis;
+using Prospect.Unreal.Core;
+using Prospect.Unreal.Core.Names;
+using Prospect.Unreal.Serialization;
+
+namespace Prospect.Unreal.Net;
+
+public class UPackageMap
+{
+    public static unsafe bool StaticSerializeName(FBitReader ar, [MaybeNullWhen(false)] out FName name)
+    {
+        if (!ar.IsLoading())
+        {
+            throw new NotImplementedException();
+        }
+
+        name = null;
+        
+        bool bHardcoded;
+        ar.SerializeBits(&bHardcoded, 1);
+            
+        if (bHardcoded)
+        {
+            // replicated by hardcoded index
+            uint nameIndex;
+
+            if (ar.EngineNetVer() < EEngineNetworkVersionHistory.HISTORY_CHANNEL_NAMES)
+            {
+                ar.SerializeInt(&nameIndex, UnrealNames.MaxNetworkedHardcodedName);
+            }
+            else
+            {
+                ar.SerializeIntPacked(&nameIndex);
+            }
+
+            if (nameIndex < UnrealNames.MaxHardcodedNameIndex)
+            {
+                // hardcoded names never have a Number
+                name = UnrealNames.FNames[(UnrealNameKey) nameIndex];
+            }
+            else
+            {
+                ar.SetError();
+            }
+        }
+        else
+        {
+            // replicated by string
+            var inString = FString.Deserialize(ar);
+            var inNumber = ar.ReadInt32();
+            name = new FName(inString, inNumber);
+        }
+
+        return true;
+    }
+}

src/Prospect.Unreal/Net/UPackageMapClient.cs

@@ -0,0 +1,9 @@
+namespace Prospect.Unreal.Net;
+
+public class UPackageMapClient
+{
+    public void Initialize(UNetConnection connection, FNetGUIDCache guidCache)
+    {
+        // TODO: Implement
+    }
+}

src/Prospect.Unreal/Serialization/FBitReaderMark.cs

@@ -0,0 +1,21 @@
+namespace Prospect.Unreal.Serialization;
+
+public class FBitReaderMark
+{
+    private long _pos;
+    
+    public FBitReaderMark(FBitReader reader)
+    {
+        _pos = reader.Pos;
+    }
+
+    public long GetPos()
+    {
+        return _pos;
+    }
+
+    public void Pop(FBitReader reader)
+    {
+        reader.Pos = _pos;
+    }
+}

src/Prospect.Unreal/Serialization/FNetBitReader.cs

@@ -0,0 +1,18 @@
+using Prospect.Unreal.Net;
+
+namespace Prospect.Unreal.Serialization;
+
+public class FNetBitReader : FBitReader
+{
+    public FNetBitReader(byte[] src) : base(src)
+    {
+        throw new NotSupportedException();
+    }
+
+    public FNetBitReader(UPackageMapClient? inPackageMap, byte[]? src, int num) : base(src, num)
+    {
+        PackageMap = inPackageMap;
+    }
+    
+    public UPackageMapClient? PackageMap { get; }
+}

src/Prospect.sln

@@ -19,6 +19,10 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Prospect.Steam", "Prospect.
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Prospect.Unreal", "Prospect.Unreal\Prospect.Unreal.csproj", "{380DD490-8F01-4025-91D7-74C289AA5B75}"
 EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Tests", "Tests", "{168B6247-2D33-4942-AB3F-C5041B3BDFEA}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Prospect.Unreal.Tests", "Prospect.Unreal.Tests\Prospect.Unreal.Tests.csproj", "{14DAE1A4-6F3F-43C0-AC17-9DCDE420AF34}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|x64 = Debug|x64
@@ -73,6 +77,14 @@ Global
 		{380DD490-8F01-4025-91D7-74C289AA5B75}.Release|x64.Build.0 = Release|Any CPU
 		{380DD490-8F01-4025-91D7-74C289AA5B75}.Release|x86.ActiveCfg = Release|Any CPU
 		{380DD490-8F01-4025-91D7-74C289AA5B75}.Release|x86.Build.0 = Release|Any CPU
+		{14DAE1A4-6F3F-43C0-AC17-9DCDE420AF34}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{14DAE1A4-6F3F-43C0-AC17-9DCDE420AF34}.Debug|x64.Build.0 = Debug|Any CPU
+		{14DAE1A4-6F3F-43C0-AC17-9DCDE420AF34}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{14DAE1A4-6F3F-43C0-AC17-9DCDE420AF34}.Debug|x86.Build.0 = Debug|Any CPU
+		{14DAE1A4-6F3F-43C0-AC17-9DCDE420AF34}.Release|x64.ActiveCfg = Release|Any CPU
+		{14DAE1A4-6F3F-43C0-AC17-9DCDE420AF34}.Release|x64.Build.0 = Release|Any CPU
+		{14DAE1A4-6F3F-43C0-AC17-9DCDE420AF34}.Release|x86.ActiveCfg = Release|Any CPU
+		{14DAE1A4-6F3F-43C0-AC17-9DCDE420AF34}.Release|x86.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -87,5 +99,6 @@ Global
 		{E65720EB-7ED5-4D81-BE06-1DFFD57C1C47} = {31D3D5D2-B011-4F9B-B6CC-D0A35675D797}
 		{DE064B5C-5E9A-44FB-8DB0-5E61DD8ED4F6} = {76364BAA-BC9D-4A92-AA2A-8914FAE22834}
 		{380DD490-8F01-4025-91D7-74C289AA5B75} = {76364BAA-BC9D-4A92-AA2A-8914FAE22834}
+		{14DAE1A4-6F3F-43C0-AC17-9DCDE420AF34} = {168B6247-2D33-4942-AB3F-C5041B3BDFEA}
 	EndGlobalSection
 EndGlobal