Added padding frame. Added PMTU padding to initial packet.

Author: Vect0rZ

QuicNet.Infrastructure/Frames/PaddingFrame.cs

@@ -13,12 +13,15 @@ public class PaddingFrame : Frame
 
         public override void Decode(ByteArray array)
         {
-            throw new NotImplementedException();
+            byte type = array.ReadByte();
         }
 
         public override byte[] Encode()
         {
-            throw new NotImplementedException();
+            List<byte> data = new List<byte>();
+            data.Add(Type);
+
+            return data.ToArray();
         }
     }
 }

QuicNet.Infrastructure/PacketCreator.cs

@@ -1,4 +1,5 @@
-using QuicNet.Infrastructure.Packets;
+using QuicNet.Infrastructure.Frames;
+using QuicNet.Infrastructure.Packets;
 using QuicNet.Infrastructure.Settings;
 using System;
 using System.Collections.Generic;
@@ -23,6 +24,10 @@ public InitialPacket CreateInitialPacket(byte sourceConnectionId, byte destinati
             packet.Version = QuicVersion.CurrentVersion;
 
             int length = packet.Encode().Length;
+            int padding = QuicSettings.PMTU - length;
+
+            for (int i = 0; i < padding; i++)
+                packet.AttachFrame(new PaddingFrame());
 
             return packet;
         }

QuicNet.Infrastructure/Packets/Packet.cs

@@ -36,7 +36,7 @@ public virtual void DecodeFrames(ByteArray array)
             FrameParser factory = new FrameParser(array);
             Frame result;
             int frames = 0;
-            while (array.HasData() && frames <= QuicSettings.MaximumFramesPerPacket)
+            while (array.HasData() && frames <= QuicSettings.PMTU)
             {
                 result = factory.GetFrame();
                 if (result != null)

QuicNet/QuicListener.cs

@@ -95,10 +95,15 @@ private void ProcessInitialPacket(Packet packet, IPEndPoint endPoint)
                 return;
             }
 
-
             InitialPacket cast = packet as InitialPacket;
             InitialPacket ip = _packetCreator.CreateInitialPacket(0, cast.SourceConnectionId);
-            if (ConnectionPool.AddConnection(cast.SourceConnectionId) == true)
+
+            // Protocol violation if the initial packet is smaller than the PMTU. (pt. 14 / 16th draft)
+            if (cast.Encode().Length < QuicSettings.PMTU)
+            {
+                ip.AttachFrame(new ConnectionCloseFrame(ErrorCode.PROTOCOL_VIOLATION, "PMTU have not been reached."));
+            }
+            else if (ConnectionPool.AddConnection(cast.SourceConnectionId) == true)
             {
                 // We're including the maximum possible stream id during the connection handshake. (4.5 / 16th draft)
                 ip.AttachFrame(new MaxStreamIdFrame(QuicSettings.MaximumStreamId, StreamType.ServerBidirectional));

QuickNet.Console/Program.cs

@@ -29,6 +29,9 @@ static void Main(string[] args)
                 PacketNumber = 777521,
                 TokenLength = 0
             };
+
+            packet = new PacketCreator().CreateInitialPacket(124, 0);
+
             ConnectionCloseFrame frame = new ConnectionCloseFrame(ErrorCode.SERVER_BUSY, "The server is too busy to process your request.");
             MaxStreamIdFrame msidframe = new MaxStreamIdFrame(144123, StreamType.ClientUnidirectional);
             //packet.AttachFrame(frame);