// This is called from ConnectionListener.OnDataReceieve()->Session.ProcessPacket()->This
/// <summary>
/// Processes and incoming packet from a client.
/// </summary>
/// <param name="packet">The ClientPacket to process.</param>
public void ProcessPacket(ClientPacket packet)
{
packetLog.DebugFormat("[{0}] Processing packet {1}", session.LoggingIdentifier, packet.Header.Sequence);
NetworkStatistics.C2S_Packets_Aggregate_Increment();
// If the client is requesting a retransmission, pull those packets from the queue and resend them.
if (packet.Header.HasFlag(PacketHeaderFlags.RequestRetransmit))
{
if (VerifyCRC(packet))
{
foreach (uint sequence in packet.HeaderOptional.RetransmitData)
{
Retransmit(sequence);
}
NetworkStatistics.C2S_RequestsForRetransmit_Aggregate_Increment();
}
return;
}
// Check if this packet's sequence is a sequence which we have already processed.
// There are some exceptions:
// Sequence 0 as we have several Seq 0 packets during connect. This also cathes a case where it seems CICMDCommand arrives at any point with 0 sequence value too.
// If the only header on the packet is AckSequence. It seems AckSequence can come in with the same sequence value sometimes.
if (packet.Header.Sequence <= lastReceivedPacketSequence && packet.Header.Sequence != 0 &&
!(packet.Header.Flags == PacketHeaderFlags.AckSequence && packet.Header.Sequence == lastReceivedPacketSequence))
{
packetLog.WarnFormat("[{0}] Packet {1} received again", session.LoggingIdentifier, packet.Header.Sequence);
return;
}
// Check if this packet's sequence is greater then the next one we should be getting.
// If true we must store it to replay once we have caught up.
var desiredSeq = lastReceivedPacketSequence + 1;
if (packet.Header.Sequence > desiredSeq)
{
packetLog.DebugFormat("[{0}] Packet {1} received out of order", session.LoggingIdentifier, packet.Header.Sequence);
if (!outOfOrderPackets.ContainsKey(packet.Header.Sequence))
{
outOfOrderPackets.TryAdd(packet.Header.Sequence, packet);
}
if (desiredSeq + 2 <= packet.Header.Sequence && DateTime.Now - LastRequestForRetransmitTime > new TimeSpan(0, 0, 1))
{
DoRequestForRetransmission(packet.Header.Sequence);
}
return;
}
// If we reach here, this is a packet we should proceed with processing.
HandlePacket(packet);
// Finally check if we have any out of order packets or fragments we need to process;
CheckOutOfOrderPackets();
CheckOutOfOrderFragments();
}
// This is called from ConnectionListener.OnDataReceieve()->Session.ProcessPacket()->This
/// <summary>
/// Processes and incoming packet from a client.
/// </summary>
/// <param name="packet">The ClientPacket to process.</param>
public void ProcessPacket(ClientPacket packet)
{
if (isReleased) // Session has been removed
{
return;
}
packetLog.DebugFormat("[{0}] Processing packet {1}", session.LoggingIdentifier, packet.Header.Sequence);
NetworkStatistics.C2S_Packets_Aggregate_Increment();
if (!packet.VerifyCRC(ConnectionData.CryptoClient, true))
{
return;
}
#region order-insensitive "half-processing"
if (packet.Header.HasFlag(PacketHeaderFlags.Disconnect))
{
session.Terminate(SessionTerminationReason.PacketHeaderDisconnect);
return;
}
if (packet.Header.HasFlag(PacketHeaderFlags.NetErrorDisconnect))
{
session.Terminate(SessionTerminationReason.ClientSentNetworkErrorDisconnect);
return;
}
// If the client is requesting a retransmission process it immediately
if (packet.Header.HasFlag(PacketHeaderFlags.RequestRetransmit))
{
foreach (uint sequence in packet.HeaderOptional.RetransmitData)
{
Retransmit(sequence);
}
NetworkStatistics.C2S_RequestsForRetransmit_Aggregate_Increment();
}
// depending on the current session state:
// Set the next timeout tick value, to compare against in the WorldManager
// Sessions that have gone past the AuthLoginRequest step will stay active for a longer period of time (exposed via configuration)
// Sessions that in the AuthLoginRequest will have a short timeout, as set in the AuthenticationHandler.DefaultAuthTimeout.
// Example: Applications that check uptime will stay in the AuthLoginRequest state.
session.Network.TimeoutTick = (session.State == SessionState.AuthLoginRequest) ?
DateTime.UtcNow.AddSeconds(AuthenticationHandler.DefaultAuthTimeout).Ticks : // Default is 15s
DateTime.UtcNow.AddSeconds(NetworkManager.DefaultSessionTimeout).Ticks; // Default is 60s
#endregion
#region Reordering stage
// Reordering stage
// Check if this packet's sequence is a sequence which we have already processed.
// There are some exceptions:
// Sequence 0 as we have several Seq 0 packets during connect. This also cathes a case where it seems CICMDCommand arrives at any point with 0 sequence value too.
// If the only header on the packet is AckSequence. It seems AckSequence can come in with the same sequence value sometimes.
if (packet.Header.Sequence <= lastReceivedPacketSequence && packet.Header.Sequence != 0 &&
!(packet.Header.Flags == PacketHeaderFlags.AckSequence && packet.Header.Sequence == lastReceivedPacketSequence))
{
packetLog.WarnFormat("[{0}] Packet {1} received again", session.LoggingIdentifier, packet.Header.Sequence);
return;
}
// Check if this packet's sequence is greater then the next one we should be getting.
// If true we must store it to replay once we have caught up.
var desiredSeq = lastReceivedPacketSequence + 1;
if (packet.Header.Sequence > desiredSeq)
{
packetLog.DebugFormat("[{0}] Packet {1} received out of order", session.LoggingIdentifier, packet.Header.Sequence);
if (!outOfOrderPackets.ContainsKey(packet.Header.Sequence))
{
outOfOrderPackets.TryAdd(packet.Header.Sequence, packet);
}
if (desiredSeq + 2 <= packet.Header.Sequence && DateTime.Now - LastRequestForRetransmitTime > new TimeSpan(0, 0, 1))
{
DoRequestForRetransmission(packet.Header.Sequence);
}
return;
}
#endregion
#region Final processing stage
// Processing stage
// If we reach here, this is a packet we should proceed with processing.
HandleOrderedPacket(packet);
// Process data now in sequence
// Finally check if we have any out of order packets or fragments we need to process;
CheckOutOfOrderPackets();
CheckOutOfOrderFragments();
#endregion
}