public bool Bind(int port, bool reuseAddress) { _udpSocketv4 = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp); _udpSocketv4.Blocking = false; _udpSocketv4.ReceiveBufferSize = NetConstants.SocketBufferSize; _udpSocketv4.SendBufferSize = NetConstants.SocketBufferSize; _udpSocketv4.SetSocketOption(SocketOptionLevel.IP, SocketOptionName.IpTimeToLive, NetConstants.SocketTTL); if (reuseAddress) { _udpSocketv4.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true); } #if !NETCORE _udpSocketv4.DontFragment = true; #endif try { _udpSocketv4.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.Broadcast, 1); } catch (SocketException e) { NetUtils.DebugWriteError("Broadcast error: {0}", e.ToString()); } if (!BindSocket(_udpSocketv4, new IPEndPoint(IPAddress.Any, port))) { return(false); } _port = ((IPEndPoint)_udpSocketv4.LocalEndPoint).Port; _running = true; _threadv4 = new Thread(ReceiveLogic); _threadv4.Name = "SocketThreadv4(" + _port + ")"; _threadv4.IsBackground = true; _threadv4.Start(_udpSocketv4); //Check IPv6 support if (!IPv6Support) { return(true); } _udpSocketv6 = new Socket(AddressFamily.InterNetworkV6, SocketType.Dgram, ProtocolType.Udp); _udpSocketv6.Blocking = false; _udpSocketv6.ReceiveBufferSize = NetConstants.SocketBufferSize; _udpSocketv6.SendBufferSize = NetConstants.SocketBufferSize; if (reuseAddress) { _udpSocketv6.SetSocketOption(SocketOptionLevel.Socket, SocketOptionName.ReuseAddress, true); } //Use one port for two sockets if (BindSocket(_udpSocketv6, new IPEndPoint(IPAddress.IPv6Any, _port))) { try { #if !ENABLE_IL2CPP _udpSocketv6.SetSocketOption( SocketOptionLevel.IPv6, SocketOptionName.AddMembership, new IPv6MulticastOption(MulticastAddressV6)); #endif } catch (Exception) { // Unity3d throws exception - ignored } _threadv6 = new Thread(ReceiveLogic); _threadv6.Name = "SocketThreadv6(" + _port + ")"; _threadv6.IsBackground = true; _threadv6.Start(_udpSocketv6); } return(true); }
//Process incoming packet internal void ProcessPacket(NetPacket packet) { _timeSinceLastPacket = 0; NetUtils.DebugWrite("[RR]PacketProperty: {0}", packet.Property); switch (packet.Property) { case PacketProperty.ConnectRequest: //response with connect long newId = BitConverter.ToInt64(packet.RawData, NetConstants.RequestConnectIdIndex); if (newId > _connectId) { _connectId = newId; } NetUtils.DebugWrite("ConnectRequest LastId: {0}, NewId: {1}, EP: {2}", ConnectId, newId, _remoteEndPoint); SendConnectAccept(); _packetPool.Recycle(packet); break; case PacketProperty.Merged: int pos = NetConstants.HeaderSize; while (pos < packet.Size) { ushort size = BitConverter.ToUInt16(packet.RawData, pos); pos += 2; NetPacket mergedPacket = _packetPool.GetAndRead(packet.RawData, pos, size); if (mergedPacket == null) { _packetPool.Recycle(packet); break; } pos += size; ProcessPacket(mergedPacket); } break; //If we get ping, send pong case PacketProperty.Ping: if (NetUtils.RelativeSequenceNumber(packet.Sequence, _remotePingSequence) < 0) { _packetPool.Recycle(packet); break; } NetUtils.DebugWrite("[PP]Ping receive, send pong"); _remotePingSequence = packet.Sequence; _packetPool.Recycle(packet); //send CreateAndSend(PacketProperty.Pong, _remotePingSequence); break; //If we get pong, calculate ping time and rtt case PacketProperty.Pong: if (NetUtils.RelativeSequenceNumber(packet.Sequence, _pingSequence) < 0) { _packetPool.Recycle(packet); break; } _pingSequence = packet.Sequence; int rtt = (int)(DateTime.UtcNow - _pingTimeStart).TotalMilliseconds; UpdateRoundTripTime(rtt); NetUtils.DebugWrite("[PP]Ping: {0}", rtt); _packetPool.Recycle(packet); break; //Process ack case PacketProperty.AckReliable: _reliableUnorderedChannel.ProcessAck(packet); _packetPool.Recycle(packet); break; case PacketProperty.AckReliableOrdered: _reliableOrderedChannel.ProcessAck(packet); _packetPool.Recycle(packet); break; //Process in order packets case PacketProperty.Sequenced: _sequencedChannel.ProcessPacket(packet); break; case PacketProperty.Reliable: _reliableUnorderedChannel.ProcessPacket(packet); break; case PacketProperty.ReliableOrdered: _reliableOrderedChannel.ProcessPacket(packet); break; //Simple packet without acks case PacketProperty.Unreliable: AddIncomingPacket(packet); return; case PacketProperty.MtuCheck: case PacketProperty.MtuOk: ProcessMtuPacket(packet); break; default: NetUtils.DebugWriteError("Error! Unexpected packet type: " + packet.Property); break; } }
private void DataReceived(byte[] reusableBuffer, int count, NetEndPoint remoteEndPoint) { #if STATS_ENABLED Statistics.PacketsReceived++; Statistics.BytesReceived += (uint)count; #endif //Try read packet NetPacket packet = _netPacketPool.GetAndRead(reusableBuffer, 0, count); if (packet == null) { NetUtils.DebugWriteError("[NM] DataReceived: bad!"); return; } //Check unconnected switch (packet.Property) { case PacketProperty.DiscoveryRequest: if (DiscoveryEnabled) { var netEvent = CreateEvent(NetEventType.DiscoveryRequest); netEvent.RemoteEndPoint = remoteEndPoint; netEvent.DataReader.SetSource(packet.RawData, NetConstants.HeaderSize, count); EnqueueEvent(netEvent); } return; case PacketProperty.DiscoveryResponse: { var netEvent = CreateEvent(NetEventType.DiscoveryResponse); netEvent.RemoteEndPoint = remoteEndPoint; netEvent.DataReader.SetSource(packet.RawData, NetConstants.HeaderSize, count); EnqueueEvent(netEvent); } return; case PacketProperty.UnconnectedMessage: if (UnconnectedMessagesEnabled) { var netEvent = CreateEvent(NetEventType.ReceiveUnconnected); netEvent.RemoteEndPoint = remoteEndPoint; netEvent.DataReader.SetSource(packet.RawData, NetConstants.HeaderSize, count); EnqueueEvent(netEvent); } return; case PacketProperty.NatIntroduction: case PacketProperty.NatIntroductionRequest: case PacketProperty.NatPunchMessage: { if (NatPunchEnabled) { NatPunchModule.ProcessMessage(remoteEndPoint, packet); } return; } } //Check normal packets NetPeer netPeer; //Check peers Monitor.Enter(_peers); int peersCount = _peers.Count; if (_peers.TryGetValue(remoteEndPoint, out netPeer)) { Monitor.Exit(_peers); //Send if (packet.Property == PacketProperty.Disconnect) { if (BitConverter.ToInt64(packet.RawData, 1) != netPeer.ConnectId) { //Old or incorrect disconnect _netPacketPool.Recycle(packet); return; } var netEvent = CreateEvent(NetEventType.Disconnect); netPeer.SetDisconnectedState(); netEvent.Peer = netPeer; netEvent.DataReader.SetSource(packet.RawData, 9, packet.Size); netEvent.DisconnectReason = DisconnectReason.RemoteConnectionClose; EnqueueEvent(netEvent); _peers.Remove(netPeer.EndPoint); //do not recycle because no sense) } else if (packet.Property == PacketProperty.ConnectAccept) { if (netPeer.ProcessConnectAccept(packet)) { var connectEvent = CreateEvent(NetEventType.Connect); connectEvent.Peer = netPeer; EnqueueEvent(connectEvent); } _netPacketPool.Recycle(packet); } else { netPeer.ProcessPacket(packet); } return; } try { if (peersCount < _maxConnections && packet.Property == PacketProperty.ConnectRequest) { int protoId = BitConverter.ToInt32(packet.RawData, 1); if (protoId != NetConstants.ProtocolId) { NetUtils.DebugWrite(ConsoleColor.Cyan, "[NM] Peer connect reject. Invalid protocol ID: " + protoId); return; } string peerKey = Encoding.UTF8.GetString(packet.RawData, 13, packet.Size - 13); if (peerKey != ConnectKey) { NetUtils.DebugWrite(ConsoleColor.Cyan, "[NM] Peer connect reject. Invalid key: " + peerKey); return; } //Getting new id for peer long connectionId = BitConverter.ToInt64(packet.RawData, 5); //response with id netPeer = new NetPeer(this, remoteEndPoint, connectionId); NetUtils.DebugWrite(ConsoleColor.Cyan, "[NM] Received peer connect request Id: {0}, EP: {1}", netPeer.ConnectId, remoteEndPoint); //clean incoming packet _netPacketPool.Recycle(packet); _peers.Add(remoteEndPoint, netPeer); var netEvent = CreateEvent(NetEventType.Connect); netEvent.Peer = netPeer; EnqueueEvent(netEvent); } } finally { Monitor.Exit(_peers); } }
internal void AddIncomingPacket(NetPacket p) { if (p.IsFragmented) { NetUtils.DebugWrite("Fragment. Id: {0}, Part: {1}, Total: {2}", p.FragmentId, p.FragmentPart, p.FragmentsTotal); //Get needed array from dictionary ushort packetFragId = p.FragmentId; IncomingFragments incomingFragments; if (!_holdedFragments.TryGetValue(packetFragId, out incomingFragments)) { incomingFragments = new IncomingFragments { Fragments = new NetPacket[p.FragmentsTotal] }; _holdedFragments.Add(packetFragId, incomingFragments); } //Cache var fragments = incomingFragments.Fragments; //Error check if (p.FragmentPart >= fragments.Length || fragments[p.FragmentPart] != null) { _packetPool.Recycle(p); NetUtils.DebugWriteError("Invalid fragment packet"); return; } //Fill array fragments[p.FragmentPart] = p; //Increase received fragments count incomingFragments.ReceivedCount++; //Increase total size int dataOffset = p.GetHeaderSize() + NetConstants.FragmentHeaderSize; incomingFragments.TotalSize += p.Size - dataOffset; //Check for finish if (incomingFragments.ReceivedCount != fragments.Length) { return; } NetUtils.DebugWrite("Received all fragments!"); NetPacket resultingPacket = _packetPool.Get(p.Property, incomingFragments.TotalSize); int resultingPacketOffset = resultingPacket.GetHeaderSize(); int firstFragmentSize = fragments[0].Size - dataOffset; for (int i = 0; i < incomingFragments.ReceivedCount; i++) { //Create resulting big packet int fragmentSize = fragments[i].Size - dataOffset; Buffer.BlockCopy( fragments[i].RawData, dataOffset, resultingPacket.RawData, resultingPacketOffset + firstFragmentSize * i, fragmentSize); //Free memory _packetPool.Recycle(fragments[i]); fragments[i] = null; } //Send to process _peerListener.ReceiveFromPeer(resultingPacket, _remoteEndPoint); //Clear memory _packetPool.Recycle(resultingPacket); _holdedFragments.Remove(packetFragId); } else //Just simple packet { _peerListener.ReceiveFromPeer(p, _remoteEndPoint); _packetPool.Recycle(p); } }