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gareth
339
src/OpenSimClient.cs
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339
src/OpenSimClient.cs
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/*
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Copyright (c) OpenSim project, http://osgrid.org/
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* * Neither the name of the <organization> nor the
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* names of its contributors may be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY <copyright holder> ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL <copyright holder> BE LIABLE FOR ANY
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* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using libsecondlife;
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using libsecondlife.Packets;
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using System.Net;
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using System.Net.Sockets;
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using System.IO;
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using System.Threading;
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using System.Timers;
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namespace OpenSim
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{
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/// <summary>
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/// Handles new client connections
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/// Constructor takes a single Packet and authenticates everything
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/// </summary>
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public class OpenSimClient {
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public LLUUID AgentID;
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public LLUUID SessionID;
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public uint CircuitCode;
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public world.Avatar ClientAvatar;
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private UseCircuitCodePacket cirpack;
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private Thread ClientThread;
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private EndPoint userEP;
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private BlockingQueue<QueItem> PacketQueue;
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private Dictionary<uint, uint> PendingAcks = new Dictionary<uint, uint>();
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private Dictionary<uint, Packet> NeedAck = new Dictionary<uint, Packet>();
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private System.Timers.Timer AckTimer;
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private uint Sequence = 0;
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private object SequenceLock = new object();
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private const int MAX_APPENDED_ACKS = 10;
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private const int RESEND_TIMEOUT = 4000;
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private const int MAX_SEQUENCE = 0xFFFFFF;
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public void ack_pack(Packet Pack) {
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//libsecondlife.Packets.PacketAckPacket ack_it = new PacketAckPacket();
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//ack_it.Packets = new PacketAckPacket.PacketsBlock[1];
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//ack_it.Packets[0] = new PacketAckPacket.PacketsBlock();
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//ack_it.Packets[0].ID = Pack.Header.ID;
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//ack_it.Header.Reliable = false;
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//OutPacket(ack_it);
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if (Pack.Header.Reliable) {
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lock (PendingAcks) {
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uint sequence = (uint)Pack.Header.Sequence;
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if (!PendingAcks.ContainsKey(sequence)) { PendingAcks[sequence] = sequence; }
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}
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}
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}
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public void ProcessInPacket(Packet Pack) {
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ack_pack(Pack);
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switch(Pack.Type) {
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case PacketType.CompleteAgentMovement:
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ClientAvatar.CompleteMovement(OpenSim_Main.local_world);
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break;
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}
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}
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private void ResendUnacked()
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{
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int now = Environment.TickCount;
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lock (NeedAck)
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{
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foreach (Packet packet in NeedAck.Values)
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{
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if (now - packet.TickCount > RESEND_TIMEOUT)
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{
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Console.WriteLine("Resending " + packet.Type.ToString() + " packet, " +
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(now - packet.TickCount) + "ms have passed", Helpers.LogLevel.Info);
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packet.Header.Resent = true;
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OutPacket(packet);
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}
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}
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}
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}
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private void SendAcks()
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{
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lock (PendingAcks)
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{
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if (PendingAcks.Count > 0)
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{
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if (PendingAcks.Count > 250)
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{
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// FIXME: Handle the odd case where we have too many pending ACKs queued up
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Console.WriteLine("Too many ACKs queued up!", Helpers.LogLevel.Error);
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return;
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}
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Console.WriteLine("Sending PacketAck");
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int i = 0;
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PacketAckPacket acks = new PacketAckPacket();
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acks.Packets = new PacketAckPacket.PacketsBlock[PendingAcks.Count];
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foreach (uint ack in PendingAcks.Values)
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{
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acks.Packets[i] = new PacketAckPacket.PacketsBlock();
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acks.Packets[i].ID = ack;
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i++;
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}
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acks.Header.Reliable = false;
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OutPacket(acks);
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PendingAcks.Clear();
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}
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}
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}
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private void AckTimer_Elapsed(object sender, ElapsedEventArgs ea)
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{
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SendAcks(); ResendUnacked();
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}
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public void ProcessOutPacket(Packet Pack) {
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// Keep track of when this packet was sent out
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Pack.TickCount = Environment.TickCount;
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if (!Pack.Header.Resent)
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{
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// Set the sequence number
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lock (SequenceLock)
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{
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if (Sequence >= MAX_SEQUENCE)
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Sequence = 1;
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else
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Sequence++;
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Pack.Header.Sequence = Sequence;
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}
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if (Pack.Header.Reliable)
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{
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lock (NeedAck)
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{
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if (!NeedAck.ContainsKey(Pack.Header.Sequence))
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{
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NeedAck.Add(Pack.Header.Sequence, Pack);
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}
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else
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{
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// Client.Log("Attempted to add a duplicate sequence number (" +
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// packet.Header.Sequence + ") to the NeedAck dictionary for packet type " +
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// packet.Type.ToString(), Helpers.LogLevel.Warning);
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}
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}
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// Don't append ACKs to resent packets, in case that's what was causing the
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// delivery to fail
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if (!Pack.Header.Resent)
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{
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// Append any ACKs that need to be sent out to this packet
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lock (PendingAcks)
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{
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if (PendingAcks.Count > 0 && PendingAcks.Count < MAX_APPENDED_ACKS &&
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Pack.Type != PacketType.PacketAck &&
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Pack.Type != PacketType.LogoutRequest)
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{
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Pack.Header.AckList = new uint[PendingAcks.Count];
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int i = 0;
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foreach (uint ack in PendingAcks.Values)
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{
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Pack.Header.AckList[i] = ack;
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i++;
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}
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PendingAcks.Clear();
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Pack.Header.AppendedAcks = true;
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}
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}
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}
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}
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}
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Console.WriteLine("OUT: \n" + Pack.ToString());
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byte[] ZeroOutBuffer = new byte[4096];
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byte[] sendbuffer;
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sendbuffer = Pack.ToBytes();
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try {
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if (Pack.Header.Zerocoded) {
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int packetsize = Helpers.ZeroEncode(sendbuffer, sendbuffer.Length, ZeroOutBuffer);
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OpenSim_Main.Server.SendTo(ZeroOutBuffer, packetsize, SocketFlags.None,userEP);
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} else {
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OpenSim_Main.Server.SendTo(sendbuffer, sendbuffer.Length, SocketFlags.None,userEP);
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}
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} catch (Exception) {
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Console.WriteLine("OpenSimClient.cs:ProcessOutPacket() - WARNING: Socket exception occurred on connection " + userEP.ToString() + " - killing thread");
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ClientThread.Abort();
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}
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}
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public void InPacket(Packet NewPack) {
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// Handle appended ACKs
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if (NewPack.Header.AppendedAcks)
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{
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lock (NeedAck)
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{
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foreach (uint ack in NewPack.Header.AckList)
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{
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NeedAck.Remove(ack);
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}
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}
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}
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// Handle PacketAck packets
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if (NewPack.Type == PacketType.PacketAck)
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{
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PacketAckPacket ackPacket = (PacketAckPacket)NewPack;
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lock (NeedAck)
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{
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foreach (PacketAckPacket.PacketsBlock block in ackPacket.Packets)
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{
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NeedAck.Remove(block.ID);
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}
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}
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} else if( ( NewPack.Type == PacketType.StartPingCheck ) ) {
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//reply to pingcheck
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libsecondlife.Packets.StartPingCheckPacket startPing = (libsecondlife.Packets.StartPingCheckPacket)NewPack;
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libsecondlife.Packets.CompletePingCheckPacket endPing = new CompletePingCheckPacket();
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endPing.PingID.PingID = startPing.PingID.PingID;
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OutPacket(endPing);
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}
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else
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{
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QueItem item = new QueItem();
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item.Packet = NewPack;
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item.Incoming = true;
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this.PacketQueue.Enqueue(item);
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}
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}
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public void OutPacket(Packet NewPack) {
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QueItem item = new QueItem();
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item.Packet = NewPack;
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item.Incoming = false;
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this.PacketQueue.Enqueue(item);
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}
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public OpenSimClient(EndPoint remoteEP, UseCircuitCodePacket initialcirpack) {
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Console.WriteLine("OpenSimClient.cs - Started up new client thread to handle incoming request");
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cirpack = initialcirpack;
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userEP = remoteEP;
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PacketQueue = new BlockingQueue<QueItem>();
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AckTimer = new System.Timers.Timer(500);
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AckTimer.Elapsed += new ElapsedEventHandler(AckTimer_Elapsed);
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AckTimer.Start();
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Thread ClientThread = new Thread(new ThreadStart(AuthUser));
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ClientThread.IsBackground = true;
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ClientThread.Start();
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}
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private void ClientLoop() {
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Console.WriteLine("OpenSimClient.cs:ClientLoop() - Entered loop");
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while(true) {
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QueItem nextPacket = PacketQueue.Dequeue();
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if(nextPacket.Incoming)
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{
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//is a incoming packet
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ProcessInPacket(nextPacket.Packet);
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}
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else
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{
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//is a out going packet
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ProcessOutPacket(nextPacket.Packet);
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}
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}
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}
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private void InitNewClient() {
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Console.WriteLine("OpenSimClient.cs:InitNewClient() - Adding viewer agent to world");
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OpenSim_Main.local_world.AddViewerAgent(this);
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world.Entity tempent=OpenSim_Main.local_world.Entities[this.AgentID];
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this.ClientAvatar=(world.Avatar)tempent;
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}
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private void AuthUser() {
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Console.WriteLine("OpenSimClient.cs:AuthUser() - Authenticating new user request with grid");
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WebRequest CheckSession = WebRequest.Create(OpenSim_Main.cfg.GridURL + "/usersessions/" + OpenSim_Main.cfg.GridSendKey + "/" + cirpack.CircuitCode.ID.ToString() + "/" + cirpack.CircuitCode.Code.ToString() + "/exists");
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WebResponse GridResponse = CheckSession.GetResponse();
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StreamReader sr = new StreamReader(GridResponse.GetResponseStream());
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String grTest = sr.ReadLine();
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sr.Close();
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GridResponse.Close();
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if(grTest.Equals("1")) { // YAY! Valid login
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Console.WriteLine("OpenSimClient.cs:AuthUser() - Got authenticated connection from " + userEP.ToString());
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this.AgentID=cirpack.CircuitCode.ID;
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this.SessionID=cirpack.CircuitCode.SessionID;
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this.CircuitCode=cirpack.CircuitCode.Code;
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InitNewClient();
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ClientLoop();
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} else { // Invalid
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Console.WriteLine("OpenSimClient.cs:AuthUser() - New user request denied to " + userEP.ToString());
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ClientThread.Abort();
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}
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}
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}
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}
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