using System; using System.Collections; using System.Collections.Generic; using libsecondlife; using libsecondlife.Packets; using System.Net; using System.Net.Sockets; using System.IO; using System.Threading; using System.Timers; using OpenSim.Framework.Utilities; namespace OpenSim { public class ClientViewBase { protected BlockingQueue<QueItem> PacketQueue; protected Dictionary<uint, uint> PendingAcks = new Dictionary<uint, uint>(); protected Dictionary<uint, Packet> NeedAck = new Dictionary<uint, Packet>(); protected System.Timers.Timer AckTimer; protected uint Sequence = 0; protected object SequenceLock = new object(); protected const int MAX_APPENDED_ACKS = 10; protected const int RESEND_TIMEOUT = 4000; protected const int MAX_SEQUENCE = 0xFFFFFF; public uint CircuitCode; public EndPoint userEP; protected OpenSimNetworkHandler m_networkServer; public ClientViewBase() { } protected virtual void ProcessInPacket(Packet Pack) { } protected virtual void ProcessOutPacket(Packet Pack) { // Keep track of when this packet was sent out Pack.TickCount = Environment.TickCount; if (!Pack.Header.Resent) { // Set the sequence number lock (SequenceLock) { if (Sequence >= MAX_SEQUENCE) Sequence = 1; else Sequence++; Pack.Header.Sequence = Sequence; } if (Pack.Header.Reliable) //DIRTY HACK { lock (NeedAck) { if (!NeedAck.ContainsKey(Pack.Header.Sequence)) { try { NeedAck.Add(Pack.Header.Sequence, Pack); } catch (Exception e) // HACKY { e.ToString(); // Ignore // Seems to throw a exception here occasionally // of 'duplicate key' despite being locked. // !?!?!? } } else { // Client.Log("Attempted to add a duplicate sequence number (" + // packet.Header.Sequence + ") to the NeedAck dictionary for packet type " + // packet.Type.ToString(), Helpers.LogLevel.Warning); } } // Don't append ACKs to resent packets, in case that's what was causing the // delivery to fail if (!Pack.Header.Resent) { // Append any ACKs that need to be sent out to this packet lock (PendingAcks) { if (PendingAcks.Count > 0 && PendingAcks.Count < MAX_APPENDED_ACKS && Pack.Type != PacketType.PacketAck && Pack.Type != PacketType.LogoutRequest) { Pack.Header.AckList = new uint[PendingAcks.Count]; int i = 0; foreach (uint ack in PendingAcks.Values) { Pack.Header.AckList[i] = ack; i++; } PendingAcks.Clear(); Pack.Header.AppendedAcks = true; } } } } } byte[] ZeroOutBuffer = new byte[4096]; byte[] sendbuffer; sendbuffer = Pack.ToBytes(); try { if (Pack.Header.Zerocoded) { int packetsize = Helpers.ZeroEncode(sendbuffer, sendbuffer.Length, ZeroOutBuffer); m_networkServer.SendPacketTo(ZeroOutBuffer, packetsize, SocketFlags.None, CircuitCode);//userEP); } else { m_networkServer.SendPacketTo(sendbuffer, sendbuffer.Length, SocketFlags.None, CircuitCode); //userEP); } } catch (Exception) { OpenSim.Framework.Console.MainConsole.Instance.WriteLine(OpenSim.Framework.Console.LogPriority.MEDIUM, "OpenSimClient.cs:ProcessOutPacket() - WARNING: Socket exception occurred on connection " + userEP.ToString() + " - killing thread"); this.KillThread(); } } public virtual void InPacket(Packet NewPack) { // Handle appended ACKs if (NewPack.Header.AppendedAcks) { lock (NeedAck) { foreach (uint ack in NewPack.Header.AckList) { NeedAck.Remove(ack); } } } // Handle PacketAck packets if (NewPack.Type == PacketType.PacketAck) { PacketAckPacket ackPacket = (PacketAckPacket)NewPack; lock (NeedAck) { foreach (PacketAckPacket.PacketsBlock block in ackPacket.Packets) { NeedAck.Remove(block.ID); } } } else if ((NewPack.Type == PacketType.StartPingCheck)) { //reply to pingcheck libsecondlife.Packets.StartPingCheckPacket startPing = (libsecondlife.Packets.StartPingCheckPacket)NewPack; libsecondlife.Packets.CompletePingCheckPacket endPing = new CompletePingCheckPacket(); endPing.PingID.PingID = startPing.PingID.PingID; OutPacket(endPing); } else { QueItem item = new QueItem(); item.Packet = NewPack; item.Incoming = true; this.PacketQueue.Enqueue(item); } } public virtual void OutPacket(Packet NewPack) { QueItem item = new QueItem(); item.Packet = NewPack; item.Incoming = false; this.PacketQueue.Enqueue(item); } # region Low Level Packet Methods protected void ack_pack(Packet Pack) { if (Pack.Header.Reliable) { libsecondlife.Packets.PacketAckPacket ack_it = new PacketAckPacket(); ack_it.Packets = new PacketAckPacket.PacketsBlock[1]; ack_it.Packets[0] = new PacketAckPacket.PacketsBlock(); ack_it.Packets[0].ID = Pack.Header.Sequence; ack_it.Header.Reliable = false; OutPacket(ack_it); } /* if (Pack.Header.Reliable) { lock (PendingAcks) { uint sequence = (uint)Pack.Header.Sequence; if (!PendingAcks.ContainsKey(sequence)) { PendingAcks[sequence] = sequence; } } }*/ } protected void ResendUnacked() { int now = Environment.TickCount; lock (NeedAck) { foreach (Packet packet in NeedAck.Values) { if ((now - packet.TickCount > RESEND_TIMEOUT) && (!packet.Header.Resent)) { OpenSim.Framework.Console.MainConsole.Instance.WriteLine(OpenSim.Framework.Console.LogPriority.VERBOSE, "Resending " + packet.Type.ToString() + " packet, " + (now - packet.TickCount) + "ms have passed"); packet.Header.Resent = true; OutPacket(packet); } } } } protected void SendAcks() { lock (PendingAcks) { if (PendingAcks.Count > 0) { if (PendingAcks.Count > 250) { // FIXME: Handle the odd case where we have too many pending ACKs queued up OpenSim.Framework.Console.MainConsole.Instance.WriteLine(OpenSim.Framework.Console.LogPriority.VERBOSE, "Too many ACKs queued up!"); return; } //OpenSim.Framework.Console.MainConsole.Instance.WriteLine("Sending PacketAck"); int i = 0; PacketAckPacket acks = new PacketAckPacket(); acks.Packets = new PacketAckPacket.PacketsBlock[PendingAcks.Count]; foreach (uint ack in PendingAcks.Values) { acks.Packets[i] = new PacketAckPacket.PacketsBlock(); acks.Packets[i].ID = ack; i++; } acks.Header.Reliable = false; OutPacket(acks); PendingAcks.Clear(); } } } protected void AckTimer_Elapsed(object sender, ElapsedEventArgs ea) { SendAcks(); ResendUnacked(); } #endregion protected virtual void KillThread() { } #region Nested Classes public class QueItem { public QueItem() { } public Packet Packet; public bool Incoming; } #endregion } }