357 lines
12 KiB
C#
357 lines
12 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Net.Sockets;
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using System.Text;
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using System.Threading.Tasks;
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using Glove;
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using System.IO;
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using System.Net;
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namespace Kneesocks {
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public class Connection {
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private bool Initialized = false;
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private UInt64? _Id = null;
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public UInt64 Id {
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get {
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if(_Id == null)
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throw new ArgumentNullException();
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return (UInt64)_Id;
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}
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set {
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if(_Id == null)
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_Id = value;
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}
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}
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internal bool IsIdNull
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=> _Id == null;
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private TcpClient Socket = null;
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private NetworkStream Stream = null;
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public Server Server { get; internal set; }
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ReadBuffer Buffer;
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private byte[] FirstTwoBytes = null;
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private int ExtraHeaderSize = 0;
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private byte[] FrameHeader = null;
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private List<Frame> ReceiveFrameBuffer = new List<Frame>();
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private List<Frame> SendFrameBuffer = new List<Frame>();
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private const int MaximumSendFrameSize = 0xFFFFF;
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protected const int PingInterval = 30;
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protected const int TimeoutInterval = 120;
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private readonly byte[] PingData = Encoding.ASCII.GetBytes("woomy!");
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private DateTime LastPing;
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private bool AwaitingPingResponse = false;
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private TimeSpan TimeSinceLastPing
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=> DateTime.UtcNow - LastPing;
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internal bool OutsidePool = false;
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public bool Disconnected { get; private set; } = false;
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public string DisconnectReason { get; private set; } = null;
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public bool Handshaked { get; private set; } = false;
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public Handshake ClientHandshake { get; private set; } = null;
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public IPAddress IP
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=> ((IPEndPoint)Socket.Client.RemoteEndPoint).Address;
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public void Initialize(TcpClient sock) {
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if(Initialized)
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return;
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Socket = sock;
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Socket.ReceiveTimeout = 1;
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Stream = sock.GetStream();
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Buffer = new ReadBuffer(Stream);
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Initialized = true;
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}
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public void Initialize(UInt64 id, TcpClient sock) {
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if(Initialized)
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return;
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Initialize(sock);
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Id = id;
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Initialized = true;
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}
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public void Initialize(Connection conn, bool preserveId = false) {
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if(Initialized)
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return;
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if(preserveId)
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_Id = conn._Id;
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Socket = conn.Socket;
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Stream = conn.Stream;
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Server = conn.Server;
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Buffer = conn.Buffer;
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FirstTwoBytes = conn.FirstTwoBytes;
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ExtraHeaderSize = conn.ExtraHeaderSize;
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FrameHeader = conn.FrameHeader;
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ReceiveFrameBuffer = conn.ReceiveFrameBuffer;
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LastPing = conn.LastPing;
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Disconnected = conn.Disconnected;
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DisconnectReason = conn.DisconnectReason;
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Handshaked = conn.Handshaked;
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ClientHandshake = conn.ClientHandshake;
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Initialized = true;
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}
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private void _Send(byte[] message, bool isFinal = true, bool singleFrame = false, bool first = false) {
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int frameCount = singleFrame ? 0 : (message.Length / MaximumSendFrameSize);
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for(var i = 0; i <= frameCount; ++i) {
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SendFrameBuffer.Add(new Frame {
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IsFinal = (i == frameCount && isFinal),
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IsMasked = false,
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Opcode = (i == 0 || (singleFrame && first)) ? Frame.kOpcode.BinaryFrame : Frame.kOpcode.Continuation,
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Content = message.Subset(i * (MaximumSendFrameSize + 1), MaximumSendFrameSize)
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});
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}
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}
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public void Send(byte[] message) {
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lock(SendFrameBuffer) {
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_Send(message);
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}
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}
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private void _Send(Stream stream, bool startingFrame = true) {
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if(!Socket.Connected)
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return;
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bool firstRead = true;
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byte[] byteBuffer = new byte[MaximumSendFrameSize];
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while(true) {
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var bytesRead = stream.Read(byteBuffer, 0, MaximumSendFrameSize);
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if(stream.Position == stream.Length) {
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_Send(bytesRead == MaximumSendFrameSize ? byteBuffer : byteBuffer.Take(bytesRead).ToArray(), true, true, firstRead);
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return;
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}
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_Send(bytesRead == MaximumSendFrameSize ? byteBuffer : byteBuffer.Take(bytesRead).ToArray(), false, true, firstRead);
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firstRead = false;
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}
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}
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public void Send(Stream stream) {
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lock(SendFrameBuffer) {
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_Send(stream);
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}
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}
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public void Send(byte[] preamble, Stream stream) {
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lock(SendFrameBuffer) {
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_Send(preamble, false);
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_Send(stream, false);
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}
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}
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private void ReadIfNotNull(ref byte[] buffer, int length) {
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buffer = buffer ?? Buffer.AttemptRead(length)
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;
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}
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private void ReadIfNotNull(ref byte[] buffer, string terminator) {
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buffer = buffer ?? Buffer.AttemptRead(terminator)
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;
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}
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internal void Parse() {
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if(Handshaked) {
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if(!Buffer.IsReading) {
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if(TimeSinceLastPing.TotalSeconds > TimeoutInterval) {
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Disconnect(Frame.kClosingReason.Normal, "Ping response timed out.");
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} else if(TimeSinceLastPing.TotalSeconds > PingInterval && !AwaitingPingResponse) {
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var frameBytes = new Frame {
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IsFinal = true,
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IsMasked = false,
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Opcode = Frame.kOpcode.Ping,
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Content = PingData
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}.GetBytes();
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Stream.Write(frameBytes, 0, frameBytes.Length);
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AwaitingPingResponse = true;
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}
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}
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lock(SendFrameBuffer) {
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if(SendFrameBuffer.Count > 0) {
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foreach(var frame in SendFrameBuffer) {
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var frameBytes = frame.GetBytes();
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Stream.Write(frameBytes, 0, frameBytes.Length);
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}
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SendFrameBuffer = new List<Frame>();
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}
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}
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}
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OnParse();
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byte[] readBuffer = null;
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if(Buffer.IsReading) {
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readBuffer = Buffer.AttemptRead();
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if(readBuffer == null) {
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if((!Handshaked || (Handshaked && FirstTwoBytes != null)) && Buffer.ElapsedReadTime.TotalSeconds > (Handshaked ? 300 : 30))
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Disconnect(Frame.kClosingReason.ProtocolError, "Timed out waiting for a full response");
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return;
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}
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}
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if(!Handshaked) {
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ReadIfNotNull(ref readBuffer, "\r\n\r\n");
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if(readBuffer == null)
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return;
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try {
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Handshake request = new Handshake(Encoding.ASCII.GetString(readBuffer));
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var response = Handshake.AcceptRequest(request).ToBytes();
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Stream.Write(response, 0, response.Length);
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ClientHandshake = request;
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Handshaked = true;
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LastPing = DateTime.UtcNow;
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} catch(Exception e) {
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Disconnect(Frame.kClosingReason.ProtocolError, e.Message);
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return;
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}
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OnOpen();
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return;
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}
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if(FirstTwoBytes == null) {
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ReadIfNotNull(ref readBuffer, 2);
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if(readBuffer == null)
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return;
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FirstTwoBytes = readBuffer;
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ExtraHeaderSize = Frame.HeaderLengthFromBytes(FirstTwoBytes) - 2;
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readBuffer = null;
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}
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if(FrameHeader == null) {
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if(ExtraHeaderSize == 0)
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FrameHeader = FirstTwoBytes;
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else {
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ReadIfNotNull(ref readBuffer, ExtraHeaderSize);
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if(readBuffer == null)
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return;
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FrameHeader = FirstTwoBytes.Concat(readBuffer).ToArray();
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}
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readBuffer = null;
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}
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if(FrameHeader != null) {
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Frame tempFrame;
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if(readBuffer == null) {
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try {
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tempFrame = Frame.HeaderFromBytes(FrameHeader);
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} catch(Exception e) {
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Disconnect(Frame.kClosingReason.ProtocolError, e.Message);
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return;
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}
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readBuffer = Buffer.AttemptRead(tempFrame.BodyLength);
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if(readBuffer == null)
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return;
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}
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try {
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tempFrame = Frame.FromBytes(FrameHeader.Concat(readBuffer).ToArray());
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} catch(Exception e) {
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Disconnect(Frame.kClosingReason.ProtocolError, e.Message);
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return;
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}
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ReceiveFrameBuffer.Add(tempFrame);
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FirstTwoBytes = null;
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ExtraHeaderSize = 0;
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FrameHeader = null;
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if(tempFrame.IsFinal) {
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switch(tempFrame.Opcode) {
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case Frame.kOpcode.Ping:
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LastPing = DateTime.UtcNow;
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AwaitingPingResponse = false;
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tempFrame.Opcode = Frame.kOpcode.Pong;
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var pingBuffer = tempFrame.GetBytes();
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Stream.Write(pingBuffer, 0, pingBuffer.Length);
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break;
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case Frame.kOpcode.Pong:
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LastPing = DateTime.UtcNow;
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AwaitingPingResponse = false;
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break;
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case Frame.kOpcode.Close:
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Disconnect(Frame.kClosingReason.Normal, "Connection closed.");
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break;
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case Frame.kOpcode.BinaryFrame:
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case Frame.kOpcode.TextFrame:
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case Frame.kOpcode.Continuation:
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byte[] byteBuffer = new byte[0];
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foreach(var frame in ReceiveFrameBuffer)
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byteBuffer = byteBuffer.Concat(frame.Content).ToArray();
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ReceiveFrameBuffer = new List<Frame>();
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OnReceive(byteBuffer);
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break;
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}
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}
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}
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}
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public void RemoveFromPool() => OutsidePool = true;
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public void Disconnect(string reason = null) => Disconnect(Frame.kClosingReason.Normal, reason);
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public void Disconnect(Frame.kClosingReason status, string reason = null) {
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Disconnected = true;
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DisconnectReason = reason;
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if(Socket.Connected) {
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Socket.SendTimeout = 1000;
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var raw = Handshaked ? Frame.Closing(status, reason).GetBytes()
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: Handshake.DenyRequest(message: reason).ToString().GetBytes();
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Stream.Write(raw, 0, raw.Length);
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Socket.Close();
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}
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OnClose();
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}
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// called after the client successfully handshakes
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protected virtual void OnOpen() { }
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// called when the thread manager iterates through
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// the thread list and stops on this thread
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protected virtual void OnParse() { }
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// called when data has been received
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protected virtual void OnReceive(byte[] data) { }
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// called when the connection is disconnected
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protected virtual void OnClose() { }
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}
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}
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