9c32a490a0
* Moved some of the packet receiving logic in to internal callbacks * Fixed HORRIBLE threading race condition with Circuit.Buffer[] git-svn-id: http://libopenmetaverse.googlecode.com/svn/trunk@22 52acb1d6-8a22-11de-b505-999d5b087335
833 lines
23 KiB
C#
833 lines
23 KiB
C#
using System;
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using System.Text;
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using System.Timers;
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using System.Collections;
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using System.Net;
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using System.Net.Sockets;
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using System.Threading;
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using System.Security.Cryptography;
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namespace libsecondlife
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{
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public delegate void PacketCallback(Packet packet, Circuit circuit);
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internal class AcceptAllCertificatePolicy : ICertificatePolicy
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{
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public AcceptAllCertificatePolicy()
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{
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}
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public bool CheckValidationResult(ServicePoint sPoint,
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System.Security.Cryptography.X509Certificates.X509Certificate cert,
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WebRequest wRequest,int certProb)
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{
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// Always accept
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return true;
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}
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}
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public class Circuit
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{
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public uint CircuitCode;
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public bool Opened;
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public ushort Sequence;
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public IPEndPoint ipEndPoint;
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private EndPoint endPoint;
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private ProtocolManager Protocol;
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private NetworkManager Network;
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private Hashtable UserCallbacks;
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private Hashtable InternalCallbacks;
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private byte[] Buffer;
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private Socket Connection;
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private AsyncCallback ReceivedData;
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private System.Timers.Timer OpenTimer;
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private System.Timers.Timer ACKTimer;
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private bool Timeout;
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private ArrayList AckOutbox;
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private Mutex AckOutboxMutex;
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private Hashtable NeedAck;
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private Mutex NeedAckMutex;
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private int ResendTick;
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public Circuit(ProtocolManager protocol, NetworkManager network, Hashtable userCallbacks,
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Hashtable internalCallbacks, uint circuitCode)
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{
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Protocol = protocol;
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Network = network;
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UserCallbacks = userCallbacks;
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InternalCallbacks = internalCallbacks;
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CircuitCode = circuitCode;
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Sequence = 0;
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Buffer = new byte[4096];
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Connection = new Socket(AddressFamily.InterNetwork, SocketType.Dgram, ProtocolType.Udp);
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Opened = false;
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Timeout = false;
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// Initialize the queue of ACKs that need to be sent to the server
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AckOutbox = new ArrayList();
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// Initialize the hashtable for reliable packets waiting on ACKs from the server
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NeedAck = new Hashtable();
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// Create a timer to test if the connection times out
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OpenTimer = new System.Timers.Timer(10000);
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OpenTimer.Elapsed += new ElapsedEventHandler(OpenTimerEvent);
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// Create a timer to send PacketAcks and resend unACKed packets
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ACKTimer = new System.Timers.Timer(1000);
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ACKTimer.Elapsed += new ElapsedEventHandler(ACKTimerEvent);
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AckOutboxMutex = new Mutex(false, "AckOutboxMutex");
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NeedAckMutex = new Mutex(false, "NeedAckMutex");
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ResendTick = 0;
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}
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~Circuit()
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{
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Stop();
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Connection.Close();
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}
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public bool Open(string ip, int port)
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{
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try
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{
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// Setup the callback
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ReceivedData = new AsyncCallback(this.OnReceivedData);
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// Create an endpoint that we will be communicating with (need it in two types due to
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// .NET weirdness)
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ipEndPoint = new IPEndPoint(IPAddress.Parse(ip), port);
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endPoint = (EndPoint)ipEndPoint;
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// Associate this circuit's socket with the given ip and port and start listening
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Connection.Connect(endPoint);
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Connection.BeginReceiveFrom(Buffer, 0, Buffer.Length, SocketFlags.None, ref endPoint, ReceivedData, null);
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// Start the circuit opening timeout
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OpenTimer.Start();
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// Start the packet resend timer
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ACKTimer.Start();
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// Send the UseCircuitCode packet to initiate the connection
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Packet packet = PacketBuilder.UseCircuitCode(Protocol, Network.LoginValues.AgentID,
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Network.LoginValues.SessionID, CircuitCode);
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// Send the initial packet out
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SendPacket(packet, true);
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while (!Timeout)
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{
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if (Opened)
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{
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return true;
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}
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Thread.Sleep(0);
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}
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}
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catch (Exception e)
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{
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Helpers.Log(e.ToString(), Helpers.LogLevel.Error);
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}
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return false;
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}
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public void Close()
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{
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try
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{
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Stop();
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// Send the CloseCircuit notice
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Packet packet = new Packet("CloseCircuit", Protocol, 8);
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SendPacket(packet, true);
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// Send any last ACKs before closing the circuit
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SendACKs();
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Connection.Close();
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}
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catch (Exception e)
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{
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Helpers.Log(e.ToString(), Helpers.LogLevel.Error);
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}
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}
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public void Stop()
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{
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try
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{
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// Stop the resend timer
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ACKTimer.Stop();
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// Stop the open circuit timer (just in case it's still running)
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OpenTimer.Stop();
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// TODO: Is this safe? Using the mutex throws an exception about a disposed object
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NeedAck.Clear();
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}
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catch (Exception e)
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{
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Helpers.Log(e.ToString(), Helpers.LogLevel.Error);
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}
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}
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public void SendPacket(Packet packet, bool incrementSequence)
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{
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byte[] zeroBuffer = new byte[4096];
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int zeroBytes;
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// DEBUG
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//Console.WriteLine("Sending " + packet.Data.Length + " byte " + packet.Layout.Name);
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try
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{
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if ((packet.Data[0] & Helpers.MSG_RELIABLE) != 0 && incrementSequence)
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{
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if (!NeedAck.ContainsKey(packet))
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{
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// This packet needs an ACK, keep track of when it was sent out
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NeedAckMutex.WaitOne();
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NeedAck.Add(packet, Environment.TickCount);
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NeedAckMutex.ReleaseMutex();
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}
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}
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if (incrementSequence)
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{
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// Set the sequence number here since we are manually serializing the packet
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packet.Sequence = ++Sequence;
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}
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// Zerocode if needed
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if ((packet.Data[0] & Helpers.MSG_ZEROCODED) != 0)
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{
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zeroBytes = Helpers.ZeroEncode(packet.Data, packet.Data.Length, zeroBuffer);
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}
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else
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{
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// Normal packet, copy it straight over to the zeroBuffer
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Array.Copy(packet.Data, 0, zeroBuffer, 0, packet.Data.Length);
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zeroBytes = packet.Data.Length;
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}
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// The incrementSequence check prevents a possible deadlock situation
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if (AckOutbox.Count != 0 && incrementSequence && packet.Layout.Name != "PacketAck" &&
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packet.Layout.Name != "LogoutRequest")
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{
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// Claim the mutex on the AckOutbox
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AckOutboxMutex.WaitOne();
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//TODO: Make sure we aren't appending more than 255 ACKs
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// Append each ACK needing to be sent out to this packet
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foreach (uint ack in AckOutbox)
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{
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Array.Copy(BitConverter.GetBytes(ack), 0, zeroBuffer, zeroBytes - 1, 4);
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zeroBytes += 4;
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}
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// Last byte is the number of ACKs
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zeroBuffer[zeroBytes - 1] = (byte)AckOutbox.Count;
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zeroBytes += 1;
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AckOutbox.Clear();
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// Release the mutex
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AckOutboxMutex.ReleaseMutex();
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// Set the flag that this packet has ACKs appended to it
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zeroBuffer[0] += Helpers.MSG_APPENDED_ACKS;
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}
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int numSent = Connection.Send(zeroBuffer, zeroBytes, SocketFlags.None);
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// DEBUG
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//Console.WriteLine("Sent " + numSent + " bytes");
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}
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catch (Exception e)
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{
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Helpers.Log(e.ToString(), Helpers.LogLevel.Error);
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}
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}
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private void SendACKs()
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{
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// Claim the mutex on the AckOutbox
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AckOutboxMutex.WaitOne();
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if (AckOutbox.Count != 0)
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{
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try
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{
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Packet packet = PacketBuilder.PacketAck(Protocol, AckOutbox);
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if (packet.Data.Length < 13)
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{
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Helpers.Log("Trying to send a PacketAck with no ACKs, cancelling", Helpers.LogLevel.Warning);
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// Release the mutex
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AckOutboxMutex.ReleaseMutex();
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return;
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}
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// Set the sequence number
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packet.Sequence = ++Sequence;
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// Bypass SendPacket since we are taking care of the AckOutbox ourself
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int numSent = Connection.Send(packet.Data);
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// DEBUG
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//Console.WriteLine("Sent " + numSent + " byte " + packet.Layout.Name);
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AckOutbox.Clear();
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}
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catch (Exception e)
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{
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Helpers.Log(e.ToString(), Helpers.LogLevel.Error);
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}
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}
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// Release the mutex
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AckOutboxMutex.ReleaseMutex();
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}
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private void OnReceivedData(IAsyncResult result)
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{
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Packet packet;
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try
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{
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// For the UseCircuitCode timeout
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Opened = true;
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OpenTimer.Stop();
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// Retrieve the incoming packet
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int numBytes = Connection.EndReceiveFrom(result, ref endPoint);
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if ((Buffer[Buffer.Length - 1] & Helpers.MSG_APPENDED_ACKS) != 0)
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{
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// Grab the ACKs that are appended to this packet
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byte numAcks = Buffer[Buffer.Length - 1];
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Helpers.Log("Found " + numAcks + " appended acks", Helpers.LogLevel.Info);
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// Claim the NeedAck mutex
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NeedAckMutex.WaitOne();
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for (int i = 1; i <= numAcks; ++i)
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{
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uint ack = BitConverter.ToUInt32(Buffer, numBytes - i * 4 - 1);
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Beginning:
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ICollection reliablePackets = NeedAck.Keys;
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// Remove this packet if it exists
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foreach (Packet reliablePacket in reliablePackets)
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{
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if ((uint)reliablePacket.Sequence == ack)
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{
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NeedAck.Remove(reliablePacket);
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goto Beginning;
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}
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}
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}
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// Release the mutex
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NeedAckMutex.ReleaseMutex();
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// Adjust the packet length
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numBytes = numBytes - numAcks * 4 - 1;
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}
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if ((Buffer[0] & Helpers.MSG_ZEROCODED) != 0)
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{
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// Allocate a temporary buffer for the zerodecoded packet
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byte[] zeroBuffer = new byte[4096];
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int zeroBytes = Helpers.ZeroDecode(Buffer, numBytes, zeroBuffer);
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packet = new Packet(zeroBuffer, zeroBytes, Protocol);
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numBytes = zeroBytes;
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}
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else
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{
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// Create the packet object from our byte array
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packet = new Packet(Buffer, numBytes, Protocol);
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}
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// DEBUG
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//Console.WriteLine("Received a " + numBytes + " byte " + packet.Layout.Name);
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// Start listening again since we're done with Buffer
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Connection.BeginReceiveFrom(Buffer, 0, Buffer.Length, SocketFlags.None, ref endPoint, ReceivedData, null);
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if ((packet.Data[0] & Helpers.MSG_RELIABLE) != 0)
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{
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if (!AckOutbox.Contains((uint)packet.Sequence))
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{
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// This packet needs to be ACKed, push its sequence number on to the queue
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AckOutboxMutex.WaitOne();
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AckOutbox.Add((uint)packet.Sequence);
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AckOutboxMutex.ReleaseMutex();
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}
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else
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{
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if ((packet.Data[0] & Helpers.MSG_RESENT) != 0)
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{
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// We received a resent packet
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Helpers.Log("Received a resent packet, sequence=" + packet.Sequence, Helpers.LogLevel.Warning);
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return;
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}
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else
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{
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// We received a resent packet
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Helpers.Log("Received a duplicate sequence number? sequence=" + packet.Sequence
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+ ", name=" + packet.Layout.Name, Helpers.LogLevel.Warning);
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}
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}
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}
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if (packet.Layout.Name == null)
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{
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Helpers.Log("Received an unrecognized packet", Helpers.LogLevel.Warning);
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return;
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}
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else if (packet.Layout.Name == "PacketAck")
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{
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// PacketAck is handled directly instead of using a callback to simplify access to
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// the NeedAck hashtable and its mutex
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ArrayList blocks = packet.Blocks();
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NeedAckMutex.WaitOne();
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// Remove each ACK in this packet from the NeedAck waiting list
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foreach (Block block in blocks)
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{
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foreach (Field field in block.Fields)
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{
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Beginning:
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ICollection reliablePackets = NeedAck.Keys;
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// Remove this packet if it exists
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foreach (Packet reliablePacket in reliablePackets)
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{
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if ((uint)reliablePacket.Sequence == (uint)field.Data)
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{
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NeedAck.Remove(reliablePacket);
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// Restart the loop to avoid upsetting the enumerator
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goto Beginning;
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}
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}
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}
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}
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NeedAckMutex.ReleaseMutex();
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}
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// Fire any internal callbacks registered with this packet type
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PacketCallback callback = (PacketCallback)InternalCallbacks[packet.Layout.Name];
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if (callback != null)
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{
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callback(packet, this);
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}
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// Fire any user callbacks registered with this packet type
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callback = (PacketCallback)UserCallbacks[packet.Layout.Name];
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if (callback != null)
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{
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callback(packet, this);
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}
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else
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{
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// Attempt to fire a default user callback
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callback = (PacketCallback)UserCallbacks["Default"];
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if (callback != null)
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{
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callback(packet, this);
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}
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}
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}
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catch (Exception e)
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{
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Helpers.Log(e.ToString(), Helpers.LogLevel.Error);
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}
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}
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private void OpenTimerEvent(object source, System.Timers.ElapsedEventArgs ea)
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{
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try
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{
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Timeout = true;
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OpenTimer.Stop();
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}
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catch (Exception e)
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{
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Helpers.Log(e.ToString(), Helpers.LogLevel.Error);
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}
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}
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private void ACKTimerEvent(object source, System.Timers.ElapsedEventArgs ea)
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{
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try
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{
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// Send any ACKs in the queue
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SendACKs();
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ResendTick++;
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if (ResendTick >= 3)
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{
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ResendTick = 0;
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// Claim the NeedAck mutex
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NeedAckMutex.WaitOne();
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Beginning:
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// Check if any reliable packets haven't been ACKed by the server
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IDictionaryEnumerator packetEnum = NeedAck.GetEnumerator();
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while (packetEnum.MoveNext())
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{
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int ticks = (int)packetEnum.Value;
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// TODO: Is this hardcoded value correct? Should it be a higher level define or a
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// changeable property?
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if (Environment.TickCount - ticks > 3000)
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{
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Packet packet = (Packet)packetEnum.Key;
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// Adjust the timeout value for this packet
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NeedAck[packet] = Environment.TickCount;
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// Add the resent flag
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packet.Data[0] += Helpers.MSG_RESENT;
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// Resend the packet
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SendPacket((Packet)packet, false);
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// Restart the loop since we modified a value and the iterator will fail
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goto Beginning;
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}
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}
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// Release the mutex
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NeedAckMutex.ReleaseMutex();
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}
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}
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catch (Exception e)
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{
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Helpers.Log(e.ToString(), Helpers.LogLevel.Error);
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}
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}
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}
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public struct LoginReply
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{
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public LLUUID SessionID;
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public LLUUID SecureSessionID;
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public string StartLocation;
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public string FirstName;
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public string LastName;
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public int RegionX;
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public int RegionY;
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public string Home;
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public string Message;
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public uint CircuitCode;
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public int Port;
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public string IP;
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public string LookAt;
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public LLUUID AgentID;
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public uint SecondsSinceEpoch;
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}
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public class NetworkManager
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{
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public LoginReply LoginValues;
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public string LoginError;
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public Hashtable UserCallbacks;
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public Circuit CurrentCircuit;
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private ProtocolManager Protocol;
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private string LoginBuffer;
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private ArrayList Circuits;
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private Hashtable InternalCallbacks;
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public NetworkManager(ProtocolManager protocol)
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{
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Protocol = protocol;
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Circuits = new ArrayList();
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UserCallbacks = new Hashtable();
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InternalCallbacks = new Hashtable();
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CurrentCircuit = null;
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// Register the internal callbacks
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PacketCallback callback = new PacketCallback(RegionHandshakeHandler);
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InternalCallbacks["RegionHandshake"] = callback;
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callback = new PacketCallback(StartPingCheckHandler);
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InternalCallbacks["StartPingCheck"] = callback;
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}
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public void SendPacket(Packet packet)
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{
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if (CurrentCircuit != null)
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{
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CurrentCircuit.SendPacket(packet, true);
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}
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else
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{
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Helpers.Log("Trying to send a packet when there is no current circuit", Helpers.LogLevel.Error);
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}
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}
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public void SendPacket(Packet packet, Circuit circuit)
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{
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circuit.SendPacket(packet, true);
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}
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public bool Login(string firstName, string lastName, string password, string mac,
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int major, int minor, int patch, int build, string platform, string viewerDigest,
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string userAgent, string author)
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{
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return Login(firstName, lastName, password, mac, major, minor, patch, build, platform,
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viewerDigest, userAgent, author, "https://login.agni.lindenlab.com/cgi-bin/login.cgi");
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}
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public bool Login(string firstName, string lastName, string password, string mac,
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int major, int minor, int patch, int build, string platform, string viewerDigest,
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string userAgent, string author, string url)
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{
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WebRequest login;
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WebResponse response;
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// Generate an MD5 hash of the password
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MD5 md5 = new MD5CryptoServiceProvider();
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byte[] hash = md5.ComputeHash(Encoding.ASCII.GetBytes(password));
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StringBuilder passwordDigest = new StringBuilder();
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// Convert the hash to a hex string
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foreach(byte b in hash)
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{
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passwordDigest.AppendFormat("{0:x2}", b);
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}
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string loginRequest =
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"<?xml version=\"1.0\"?><methodCall><methodName>login_to_simulator</methodName>" +
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"<params><param><value><struct>" +
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"<member><name>first</name><value><string>" + firstName + "</string></value></member>" +
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"<member><name>last</name><value><string>" + lastName + "</string></value></member>" +
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"<member><name>passwd</name><value><string>$1$" + passwordDigest + "</string></value></member>" +
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"<member><name>start</name><value><string>last</string></value></member>" +
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"<member><name>major</name><value><string>" + major + "</string></value></member>" +
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"<member><name>minor</name><value><string>" + minor + "</string></value></member>" +
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"<member><name>patch</name><value><string>" + patch + "</string></value></member>" +
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"<member><name>build</name><value><string>" + build + "</string></value></member>" +
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"<member><name>platform</name><value><string>" + platform + "</string></value></member>" +
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"<member><name>mac</name><value><string>" + mac + "</string></value></member>" +
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"<member><name>viewer_digest</name><value><string>" + viewerDigest + "</string></value></member>" +
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"<member><name>user-agent</name><value><string>" + userAgent +
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" (" + Helpers.VERSION + ")</string></value></member>" +
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"<member><name>author</name><value><string>" + author + "</string></value></member>" +
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"</struct></value></param></params></methodCall>"
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;
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// Override SSL authentication mechanisms
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ServicePointManager.CertificatePolicy = new AcceptAllCertificatePolicy();
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login = WebRequest.Create(url);
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login.ContentType = "text/xml";
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login.Method = "POST";
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login.Timeout = 12000;
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byte[] request = System.Text.Encoding.ASCII.GetBytes(loginRequest);
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login.ContentLength = request.Length;
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System.IO.Stream stream = login.GetRequestStream();
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try
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{
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stream.Write(request, 0, request.Length);
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stream.Close();
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response = login.GetResponse();
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if (response == null)
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{
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LoginError = "Error logging in: (Unknown)";
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Helpers.Log(LoginError, Helpers.LogLevel.Warning);
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return false;
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}
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//TODO: To support UTF8 avatar names the encoding should be handled better
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System.IO.StreamReader streamReader = new System.IO.StreamReader(response.GetResponseStream(),
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System.Text.Encoding.ASCII);
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LoginBuffer = streamReader.ReadToEnd();
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streamReader.Close();
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response.Close();
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}
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catch (Exception e)
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{
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LoginError = "Caught an exception logging in: " + e.ToString();
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Helpers.Log(LoginError, Helpers.LogLevel.Warning);
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}
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// Parse the login reply and put the returned variables in to a struct
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if (!ParseLoginReply())
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{
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return false;
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}
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// Connect to the sim given in the login reply
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Circuit circuit = new Circuit(Protocol, this, UserCallbacks, InternalCallbacks, LoginValues.CircuitCode);
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if (!circuit.Open(LoginValues.IP, LoginValues.Port))
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{
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return false;
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}
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// Circuit was successfully opened, add it to the list and set it as default
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Circuits.Add(circuit);
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CurrentCircuit = circuit;
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// Move our agent in to the sim to complete the connection
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Packet packet = PacketBuilder.CompleteAgentMovement(Protocol, LoginValues.AgentID, LoginValues.SessionID,
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LoginValues.CircuitCode);
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SendPacket(packet);
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return true;
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}
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public void Logout()
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{
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// TODO: Close all circuits except the current one
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// Halt all timers on the current circuit
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CurrentCircuit.Stop();
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Packet packet = PacketBuilder.LogoutRequest(Protocol, LoginValues.AgentID, LoginValues.SessionID);
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SendPacket(packet);
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// TODO: We should probably check if the server actually received the logout request
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// Instead we'll use this silly Sleep()
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System.Threading.Thread.Sleep(1000);
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}
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private bool ParseLoginReply()
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{
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string msg;
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msg = RpcGetString(LoginBuffer, "<name>reason</name>");
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if (msg.Length != 0)
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{
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LoginError = RpcGetString(LoginBuffer, "<name>message</name>");
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return false;
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}
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msg = RpcGetString(LoginBuffer, "login</name><value><string>true");
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if (msg.Length == 0)
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{
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LoginError = "Unknown login error";
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return false;
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}
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// Grab the login parameters
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LoginValues.SessionID = RpcGetString(LoginBuffer.ToString(), "<name>session_id</name>");
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LoginValues.SecureSessionID = RpcGetString(LoginBuffer.ToString(), "<name>secure_session_id</name>");
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LoginValues.StartLocation = RpcGetString(LoginBuffer.ToString(), "<name>start_location</name>");
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LoginValues.FirstName = RpcGetString(LoginBuffer.ToString(), "<name>first_name</name>");
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LoginValues.LastName = RpcGetString(LoginBuffer.ToString(), "<name>last_name</name>");
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LoginValues.RegionX = RpcGetInt(LoginBuffer.ToString(), "<name>region_x</name>");
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LoginValues.RegionY = RpcGetInt(LoginBuffer.ToString(), "<name>region_y</name>");
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LoginValues.Home = RpcGetString(LoginBuffer.ToString(), "<name>home</name>");
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LoginValues.Message = RpcGetString(LoginBuffer.ToString(), "<name>message</name>").Replace("\r\n", "");
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LoginValues.CircuitCode = (uint)RpcGetInt(LoginBuffer.ToString(), "<name>circuit_code</name>");
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LoginValues.Port = RpcGetInt(LoginBuffer.ToString(), "<name>sim_port</name>");
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LoginValues.IP = RpcGetString(LoginBuffer.ToString(), "<name>sim_ip</name>");
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LoginValues.LookAt = RpcGetString(LoginBuffer.ToString(), "<name>look_at</name>");
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LoginValues.AgentID = RpcGetString(LoginBuffer.ToString(), "<name>agent_id</name>");
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LoginValues.SecondsSinceEpoch = (uint)RpcGetInt(LoginBuffer.ToString(), "<name>seconds_since_epoch</name>");
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return true;
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}
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string RpcGetString(string rpc, string name)
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{
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int pos = rpc.IndexOf(name);
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int pos2;
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if (pos == -1)
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{
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return "";
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}
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rpc = rpc.Substring(pos, rpc.Length - pos);
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pos = rpc.IndexOf("<string>");
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if (pos == -1)
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{
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return "";
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}
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rpc = rpc.Substring(pos + 8, rpc.Length - (pos + 8));
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pos2 = rpc.IndexOf("</string>");
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if (pos2 == -1)
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{
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return "";
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}
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return rpc.Substring(0, pos2);
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}
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int RpcGetInt(string rpc, string name)
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{
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int pos = rpc.IndexOf(name);
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int pos2;
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if (pos == -1)
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{
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return -1;
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}
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rpc = rpc.Substring(pos, rpc.Length - pos);
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pos = rpc.IndexOf("<i4>");
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if (pos == -1)
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{
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return -1;
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}
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rpc = rpc.Substring(pos + 4, rpc.Length - (pos + 4));
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pos2 = rpc.IndexOf("</i4>");
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if (pos2 == -1)
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{
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return -1;
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}
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return Int32.Parse(rpc.Substring(0, pos2));
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}
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private void StartPingCheckHandler(Packet packet, Circuit circuit)
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{
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//TODO: Should we care about OldestUnacked?
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// Respond to the ping request
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Packet pingPacket = PacketBuilder.CompletePingCheck(Protocol, packet.Data[5]);
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SendPacket(pingPacket, circuit);
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}
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private void RegionHandshakeHandler(Packet packet, Circuit circuit)
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{
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// Send a RegionHandshakeReply
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Packet replyPacket = new Packet("RegionHandshakeReply", Protocol, 12);
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SendPacket(replyPacket, circuit);
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}
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}
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}
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