private static void SendCharacterCreateResponse(Session session, uint responseCode, uint guid = 0, string charName = null)
{
var charCreateResponse = new ServerPacket(0x0B, PacketHeaderFlags.EncryptedChecksum);
var charCreateFragment = new ServerPacketFragment(9, FragmentOpcode.CharacterCreateResponse);
if (responseCode == 1)
{
charCreateFragment.Payload.Write(responseCode);
charCreateFragment.Payload.Write(guid);
charCreateFragment.Payload.WriteString16L(charName);
charCreateFragment.Payload.Write(0u);
}
else
{
charCreateFragment.Payload.Write(responseCode);
}
charCreateResponse.Fragments.Add(charCreateFragment);
NetworkManager.SendPacket(ConnectionType.Login, charCreateResponse, session);
}
public static void CharacterEnterWorld(ClientPacketFragment fragment, Session session)
{
ObjectGuid guid = fragment.Payload.ReadGuid();
string account = fragment.Payload.ReadString16L();
if (account != session.Account)
{
session.SendCharacterError(CharacterError.EnterGameCharacterNotOwned);
return;
}
var cachedCharacter = session.CachedCharacters.SingleOrDefault(c => c.Guid.Full == guid.Full);
if (cachedCharacter == null)
{
session.SendCharacterError(CharacterError.EnterGameCharacterNotOwned);
return;
}
session.CharacterRequested = cachedCharacter;
// this isn't really that necessary since ACE doesn't split login/world to multiple daemons, handle it anyway
byte[] connectionKey = new byte[sizeof(ulong)];
RandomNumberGenerator.Create().GetNonZeroBytes(connectionKey);
session.WorldConnectionKey = BitConverter.ToUInt64(connectionKey, 0);
var referralPacket = new ServerPacket(0x0B, PacketHeaderFlags.EncryptedChecksum | PacketHeaderFlags.Referral);
referralPacket.Payload.Write(session.WorldConnectionKey);
referralPacket.Payload.Write((ushort)2);
referralPacket.Payload.WriteUInt16BE((ushort)ConfigManager.Config.Server.Network.WorldPort);
referralPacket.Payload.Write(ConfigManager.Host);
referralPacket.Payload.Write(0ul);
referralPacket.Payload.Write((ushort)0x18);
referralPacket.Payload.Write((ushort)0);
referralPacket.Payload.Write(0u);
NetworkManager.SendPacket(ConnectionType.Login, referralPacket, session);
session.State = SessionState.WorldLoginRequest;
}
private static void AccountSelectCallback(Account account, Session session)
{
var connectResponse = new ServerPacket(0x0B, PacketHeaderFlags.ConnectRequest);
connectResponse.Payload.Write(0u);
connectResponse.Payload.Write(0u);
connectResponse.Payload.Write(13626398284849559039ul); // some sort of check value?
connectResponse.Payload.Write((ushort)0);
connectResponse.Payload.Write((ushort)0);
connectResponse.Payload.Write(ISAAC.ServerSeed);
connectResponse.Payload.Write(ISAAC.ClientSeed);
connectResponse.Payload.Write(0u);
NetworkManager.SendPacket(ConnectionType.Login, connectResponse, session);
if (account == null)
{
session.SendCharacterError(CharacterError.AccountDoesntExist);
return;
}
if (WorldManager.Find(account.Name) != null)
{
session.SendCharacterError(CharacterError.AccountInUse);
return;
}
/*if (glsTicket != digest)
* {
* }*/
/*if (WorldManager.ServerIsFull())
* {
* session.SendCharacterError(CharacterError.LogonServerFull);
* return;
* }*/
// TODO: check for account bans
session.SetAccount(account.AccountId, account.Name);
session.State = SessionState.AuthConnectResponse;
}
public static void CharacterListSelectCallback(MySqlResult result, Session session)
{
var characterList = new ServerPacket(0x0B, PacketHeaderFlags.EncryptedChecksum);
var characterFragment = new ServerPacketFragment(9, FragmentOpcode.CharacterList);
characterFragment.Payload.Write(0u);
characterFragment.Payload.Write(result.Count);
session.CachedCharacters.Clear();
for (byte i = 0; i < result.Count; i++)
{
uint lowGuid = result.Read <uint>(i, "guid");
string name = result.Read <string>(i, "name");
characterFragment.Payload.Write(lowGuid);
characterFragment.Payload.WriteString16L(name);
ulong deleteTime = result.Read <ulong>(i, "deleteTime");
characterFragment.Payload.Write(deleteTime != 0ul ? (uint)(WorldManager.GetUnixTime() - deleteTime) : 0u);
session.CachedCharacters.Add(new CachedCharacter(lowGuid, i, name));
}
characterFragment.Payload.Write(0u);
characterFragment.Payload.Write(11u /*slotCount*/);
characterFragment.Payload.WriteString16L(session.Account);
characterFragment.Payload.Write(0u /*useTurbineChat*/);
characterFragment.Payload.Write(0u /*hasThroneOfDestiny*/);
characterList.Fragments.Add(characterFragment);
NetworkManager.SendPacket(ConnectionType.Login, characterList, session);
var serverName = new ServerPacket(0x0B, PacketHeaderFlags.EncryptedChecksum);
var serverNameFragment = new ServerPacketFragment(9, FragmentOpcode.ServerName);
serverNameFragment.Payload.Write(0u);
serverNameFragment.Payload.Write(0u);
serverNameFragment.Payload.WriteString16L(ConfigManager.Config.Server.WorldName);
serverName.Fragments.Add(serverNameFragment);
NetworkManager.SendPacket(ConnectionType.Login, serverName, session);
}
private void SendPacketRaw(ServerPacket packet)
{
Socket socket = SocketManager.GetSocket();
if (packet.Header.Sequence == 0)
{
socket = SocketManager.GetSocket(0);
}
byte[] payload = packet.GetPayload();
if (packetLog.IsDebugEnabled)
{
System.Net.IPEndPoint listenerEndpoint = (System.Net.IPEndPoint)socket.LocalEndPoint;
StringBuilder sb = new StringBuilder();
sb.AppendLine(String.Format("[{5}] Sending Packet (Len: {0}) [{1}:{2}=>{3}:{4}]", payload.Length, listenerEndpoint.Address, listenerEndpoint.Port, session.EndPoint.Address, session.EndPoint.Port, session.SubscriptionId));
sb.AppendLine(payload.BuildPacketString());
packetLog.Debug(sb.ToString());
}
socket.SendTo(payload, session.EndPoint);
}
public static void CharacterRestore(ClientPacketFragment fragment, Session session)
{
ObjectGuid guid = fragment.Payload.ReadGuid();
var cachedCharacter = session.CachedCharacters.SingleOrDefault(c => c.Guid.Full == guid.Full);
if (cachedCharacter == null)
{
return;
}
DatabaseManager.Character.DeleteOrRestore(0, guid.Low);
var characterRestore = new ServerPacket(0x0B, PacketHeaderFlags.EncryptedChecksum);
var characterRestoreFragment = new ServerPacketFragment(9, FragmentOpcode.CharacterRestoreResponse);
characterRestoreFragment.Payload.Write(1u /* Verification OK flag */);
characterRestoreFragment.Payload.WriteGuid(guid);
characterRestoreFragment.Payload.WriteString16L(cachedCharacter.Name);
characterRestoreFragment.Payload.Write(0u /* secondsGreyedOut */);
characterRestore.Fragments.Add(characterRestoreFragment);
NetworkManager.SendPacket(ConnectionType.Login, characterRestore, session);
}
private void FlushPackets()
{
while (packetQueue.Count > 0)
{
ServerPacket packet = packetQueue.Dequeue();
if (packet.Header.HasFlag(PacketHeaderFlags.EncryptedChecksum) && ConnectionData.PacketSequence < 2)
{
ConnectionData.PacketSequence = 2;
}
packet.Header.Sequence = ConnectionData.PacketSequence++;
packet.Header.Id = ServerId;
packet.Header.Table = 0x14;
packet.Header.Time = (ushort)ConnectionData.ServerTime;
if (packet.Header.Sequence >= 2u)
{
cachedPackets.TryAdd(packet.Header.Sequence, packet);
}
SendPacket(packet);
}
}
public static void CharacterListSelectCallback(List <CachedCharacter> characters, Session session)
{
var characterList = new ServerPacket(0x0B, PacketHeaderFlags.EncryptedChecksum);
var characterFragment = new ServerPacketFragment(9, FragmentOpcode.CharacterList);
characterFragment.Payload.Write(0u);
characterFragment.Payload.Write(characters.Count);
session.CachedCharacters.Clear();
foreach (var character in characters)
{
characterFragment.Payload.Write(character.LowGuid);
characterFragment.Payload.WriteString16L(character.Name);
characterFragment.Payload.Write(character.DeleteTime != 0ul ? (uint)(WorldManager.GetUnixTime() - character.DeleteTime) : 0u);
session.CachedCharacters.Add(character);
}
characterFragment.Payload.Write(0u);
characterFragment.Payload.Write(11u /*slotCount*/);
characterFragment.Payload.WriteString16L(session.Account);
characterFragment.Payload.Write(0u /*useTurbineChat*/);
characterFragment.Payload.Write(0u /*hasThroneOfDestiny*/);
characterList.Fragments.Add(characterFragment);
NetworkManager.SendPacket(ConnectionType.Login, characterList, session);
var serverName = new ServerPacket(0x0B, PacketHeaderFlags.EncryptedChecksum);
var serverNameFragment = new ServerPacketFragment(9, FragmentOpcode.ServerName);
serverNameFragment.Payload.Write(0u);
serverNameFragment.Payload.Write(0u);
serverNameFragment.Payload.WriteString16L(ConfigManager.Config.Server.WorldName);
serverName.Fragments.Add(serverNameFragment);
NetworkManager.SendPacket(ConnectionType.Login, serverName, session);
}
private void FlushPackets()
{
while (packetQueue.Count > 0)
{
ServerPacket packet = packetQueue.Dequeue();
if (packet.Header.HasFlag(PacketHeaderFlags.EncryptedChecksum) && ConnectionData.PacketSequence < 2)
{
ConnectionData.PacketSequence = 2;
}
packet.Header.Sequence = ConnectionData.PacketSequence++;
packet.Header.Id = 0x0B; // This value is currently the hard coded Server ID. It can be something different...
packet.Header.Table = 0x14;
packet.Header.Time = (ushort)ConnectionData.ServerTime;
if (packet.Header.Sequence >= 2u)
{
cachedPackets.TryAdd(packet.Header.Sequence, packet);
}
SendPacket(packet);
}
}
public static void SendPacketDirect(ConnectionType type, ServerPacket packet, Session session)
{
GetSocket(type).SendTo(packet.Data.ToArray(), session.EndPoint);
}
/// <summary>
/// This function handles turning a bundle of messages (representing all messages accrued in a timeslice),
/// into 1 or more packets, combining multiple messages into one packet or spliting large message across
/// several packets as needed.
///
/// 1 Create Packet
/// 2 If first packet for this bundle, fill any optional headers
/// 3 Append messages that will fit
/// 4 If we have more messages, create additional packets.
/// 5 If any packet is greater than the max packet size, split it across two fragments
/// </summary>
/// <param name="bundle"></param>
private void SendBundle(NetworkBundle bundle)
{
bool firstPacket = true;
MessageFragment carryOverMessage = null;
while (firstPacket || carryOverMessage != null || bundle.Messages.Count > 0)
{
ServerPacket packet = new ServerPacket();
PacketHeader packetHeader = packet.Header;
if (bundle.EncryptedChecksum)
{
packetHeader.Flags |= PacketHeaderFlags.EncryptedChecksum;
}
uint availableSpace = Packet.MaxPacketDataSize;
if (firstPacket)
{
firstPacket = false;
if (bundle.SendAck) //0x4000
{
packetHeader.Flags |= PacketHeaderFlags.AckSequence;
packet.BodyWriter.Write(lastReceivedSequence);
}
if (bundle.TimeSync) //0x1000000
{
packetHeader.Flags |= PacketHeaderFlags.TimeSynch;
packet.BodyWriter.Write(ConnectionData.ServerTime);
}
if (bundle.ClientTime != -1f) //0x4000000
{
packetHeader.Flags |= PacketHeaderFlags.EchoResponse;
packet.BodyWriter.Write(bundle.ClientTime);
packet.BodyWriter.Write((float)ConnectionData.ServerTime - bundle.ClientTime);
}
availableSpace -= (uint)packet.Data.Length;
}
if (carryOverMessage != null || bundle.Messages.Count > 0)
{
packetHeader.Flags |= PacketHeaderFlags.BlobFragments;
int fragmentCount = 0;
while (carryOverMessage != null || bundle.Messages.Count > 0)
{
MessageFragment currentMessageFragment;
if (carryOverMessage != null) // If we have a carryOverMessage, use that
{
currentMessageFragment = carryOverMessage;
carryOverMessage = null;
}
else // If we don't have a carryOverMessage, go ahead and dequeue next message from the bundle
{
currentMessageFragment = new MessageFragment(bundle.Messages.Dequeue());
}
var currentGameMessage = currentMessageFragment.message;
availableSpace -= PacketFragmentHeader.HeaderSize; // Account for fragment header
// Compute amount of data to send based on the total length and current position
uint dataToSend = (uint)currentGameMessage.Data.Length - currentMessageFragment.position;
if (dataToSend > availableSpace) // Message is too large to fit in packet
{
carryOverMessage = currentMessageFragment;
if (fragmentCount == 0) // If this is first message in packet, this is just a really large message, so proceed with splitting it
{
dataToSend = availableSpace;
}
else // Otherwise there are other messages already, so we'll break and come back and see if the message will fit
{
break;
}
}
if (currentMessageFragment.count == 0) // Compute number of fragments if we have not already
{
uint remainingData = (uint)currentGameMessage.Data.Length - dataToSend;
currentMessageFragment.count = (ushort)(Math.Ceiling((double)remainingData / PacketFragment.MaxFragmentDataSize) + 1);
}
// Set sequence, if new, pull next sequence from ConnectionData, if it is a carryOver, reuse that sequence
currentMessageFragment.sequence = currentMessageFragment.sequence == 0 ? ConnectionData.FragmentSequence++ : currentMessageFragment.sequence;
// Build ServerPacketFragment structure
ServerPacketFragment fragment = new ServerPacketFragment();
PacketFragmentHeader fragmentHeader = fragment.Header;
fragmentHeader.Sequence = currentMessageFragment.sequence;
fragmentHeader.Id = 0x80000000;
fragmentHeader.Count = currentMessageFragment.count;
fragmentHeader.Index = currentMessageFragment.index;
fragmentHeader.Group = (ushort)currentMessageFragment.message.Group;
// Read data starting at current position reading dataToSend bytes
currentGameMessage.Data.Seek(currentMessageFragment.position, SeekOrigin.Begin);
fragment.Content = new byte[dataToSend];
currentGameMessage.Data.Read(fragment.Content, 0, (int)dataToSend);
// Increment position and index
currentMessageFragment.position = currentMessageFragment.position + dataToSend;
currentMessageFragment.index++;
// Add fragment to packet
packet.AddFragment(fragment);
fragmentCount++;
// Deduct consumed space
availableSpace -= dataToSend;
// Smallest message I am aware of requires HeaderSize + 4 bytes, so if we have less space then that, go ahead and break
if (availableSpace <= PacketFragmentHeader.HeaderSize + 4)
{
break;
}
}
}
PacketQueue.Enqueue(packet);
}
}
/// <summary>
/// This function handles turning a bundle of messages (representing all messages accrued in a timeslice),
/// into 1 or more packets, combining multiple messages into one packet or spliting large message across
/// several packets as needed.
/// </summary>
/// <param name="bundle"></param>
private void SendBundle(NetworkBundle bundle)
{
log.DebugFormat("[{0}] Sending Bundle", session.LoggingIdentifier);
bool writeOptionalHeaders = true;
List <MessageFragment> fragments = new List <MessageFragment>();
// Pull all messages out and create MessageFragment objects
while (bundle.HasMoreMessages)
{
var message = bundle.Dequeue();
var fragment = new MessageFragment(message, ConnectionData.FragmentSequence++);
fragments.Add(fragment);
}
log.DebugFormat("[{0}] Bundle Fragment Count: {1}", session.LoggingIdentifier, fragments.Count);
// Loop through while we have fragements
while (fragments.Count > 0 || writeOptionalHeaders)
{
ServerPacket packet = new ServerPacket();
PacketHeader packetHeader = packet.Header;
if (fragments.Count > 0)
{
packetHeader.Flags |= PacketHeaderFlags.BlobFragments;
}
if (bundle.EncryptedChecksum)
{
packetHeader.Flags |= PacketHeaderFlags.EncryptedChecksum;
}
uint availableSpace = Packet.MaxPacketDataSize;
// Pull first message and see if it is a large one
var firstMessage = fragments.FirstOrDefault();
if (firstMessage != null)
{
// If a large message send only this one, filling the whole packet
if (firstMessage.DataRemaining >= availableSpace)
{
log.DebugFormat("[{0}] Sending large fragment", session.LoggingIdentifier);
ServerPacketFragment spf = firstMessage.GetNextFragment();
packet.Fragments.Add(spf);
availableSpace -= (uint)spf.Length;
if (firstMessage.DataRemaining <= 0)
{
fragments.Remove(firstMessage);
}
}
// Otherwise we'll write any optional headers and process any small messages that will fit
else
{
if (writeOptionalHeaders)
{
writeOptionalHeaders = false;
WriteOptionalHeaders(bundle, packet);
availableSpace -= (uint)packet.Data.Length;
}
// Create a list to remove completed messages after iterator
List <MessageFragment> removeList = new List <MessageFragment>();
foreach (MessageFragment fragment in fragments)
{
// Is this a large fragment and does it have a tail that needs sending?
if (!fragment.TailSent && availableSpace >= fragment.TailSize)
{
log.DebugFormat("[{0}] Sending tail fragment", session.LoggingIdentifier);
ServerPacketFragment spf = fragment.GetTailFragment();
packet.Fragments.Add(spf);
availableSpace -= (uint)spf.Length;
}
// Otherwise will this message fit in the remaining space?
else if (availableSpace >= fragment.NextSize)
{
log.DebugFormat("[{0}] Sending small message", session.LoggingIdentifier);
ServerPacketFragment spf = fragment.GetNextFragment();
packet.Fragments.Add(spf);
availableSpace -= (uint)spf.Length;
}
// If message is out of data, set to remove it
if (fragment.DataRemaining <= 0)
{
removeList.Add(fragment);
}
}
// Remove all completed messages
fragments.RemoveAll(x => removeList.Contains(x));
}
}
// If no messages, write optional headers
else
{
log.DebugFormat("[{0}] No messages, just sending optional headers", session.LoggingIdentifier);
if (writeOptionalHeaders)
{
writeOptionalHeaders = false;
WriteOptionalHeaders(bundle, packet);
availableSpace -= (uint)packet.Data.Length;
}
}
EnqueueSend(packet);
}
}
public static void HandlePacket(ConnectionType type, ClientPacket packet, Session session)
{
// CLinkStatusAverages::OnPingResponse
if (packet.Header.HasFlag(PacketHeaderFlags.EchoRequest))
{
var connectionData = (type == ConnectionType.Login ? session.LoginConnection : session.WorldConnection);
// used to calculate round trip time (ping)
// client calculates: currentTime - requestTime - serverDrift
var echoResponse = new ServerPacket((ushort)(type == ConnectionType.Login ? 0x0B : 0x18), PacketHeaderFlags.EncryptedChecksum | PacketHeaderFlags.EchoResponse);
echoResponse.Payload.Write(packet.HeaderOptional.ClientTime);
echoResponse.Payload.Write((float)connectionData.ServerTime - packet.HeaderOptional.ClientTime);
NetworkManager.SendPacket(type, echoResponse, session);
}
// ClientNet::HandleTimeSynch
if (packet.Header.HasFlag(PacketHeaderFlags.TimeSynch))
{
var connectionData = (type == ConnectionType.Login ? session.LoginConnection : session.WorldConnection);
// used to update time at client and check for overspeed (60s desync and client will disconenct with speed hack warning)
var timeSynchResponse = new ServerPacket((ushort)(type == ConnectionType.Login ? 0x0B : 0x18), PacketHeaderFlags.EncryptedChecksum | PacketHeaderFlags.TimeSynch);
timeSynchResponse.Payload.Write(connectionData.ServerTime);
NetworkManager.SendPacket(type, timeSynchResponse, session);
}
if (packet.Header.HasFlag(PacketHeaderFlags.RequestRetransmit))
{
foreach (uint sequence in packet.HeaderOptional.RetransmitData)
{
CachedPacket cachedPacket;
if (session.CachedPackets.TryGetValue(sequence, out cachedPacket))
{
if (!cachedPacket.Packet.Header.HasFlag(PacketHeaderFlags.Retransmission))
{
cachedPacket.Packet.Header.Flags |= PacketHeaderFlags.Retransmission;
uint issacXor;
cachedPacket.Packet.Header.Checksum = packet.CalculateChecksum(session, ConnectionType.World, cachedPacket.IssacXor, out issacXor);
}
NetworkManager.SendPacketDirect(ConnectionType.World, cachedPacket.Packet, session);
}
}
}
if (type == ConnectionType.Login)
{
if (packet.Header.HasFlag(PacketHeaderFlags.LoginRequest))
{
AuthenticationHandler.HandleLoginRequest(packet, session);
return;
}
if (packet.Header.HasFlag(PacketHeaderFlags.ConnectResponse) && session.Authenticated)
{
AuthenticationHandler.HandleConnectResponse(packet, session);
return;
}
}
else
{
if (packet.Header.HasFlag(PacketHeaderFlags.WorldLoginRequest))
{
AuthenticationHandler.HandleWorldLoginRequest(packet, session);
return;
}
if (packet.Header.HasFlag(PacketHeaderFlags.ConnectResponse))
{
AuthenticationHandler.HandleWorldConnectResponse(packet, session);
return;
}
}
if (packet.Header.HasFlag(PacketHeaderFlags.Disconnect))
{
HandleDisconnectResponse(packet, session);
}
foreach (ClientPacketFragment fragment in packet.Fragments)
{
var opcode = (FragmentOpcode)fragment.Payload.ReadUInt32();
if (!fragmentHandlers.ContainsKey(opcode))
{
Console.WriteLine($"Received unhandled fragment opcode: 0x{((uint)opcode).ToString("X4")}");
}
else
{
FragmentHandler fragmentHandler;
if (fragmentHandlers.TryGetValue(opcode, out fragmentHandler))
{
fragmentHandler.Invoke(fragment, session);
}
}
}
}
// TODO: packet pipe really needs a rework...
private static bool ConstructPacket(out byte[] buffer, ConnectionType type, ServerPacket packet, Session session, bool useHeaders = false)
{
var connectionData = (type == ConnectionType.Login ? session.LoginConnection : session.WorldConnection);
using (var packetStream = new MemoryStream())
{
using (var packetWriter = new BinaryWriter(packetStream))
{
packetWriter.Seek((int)PacketHeader.HeaderSize, SeekOrigin.Begin);
packetWriter.Write(packet.Data.ToArray());
if (packet.Fragments.Count > 0)
{
packet.Header.Flags |= PacketHeaderFlags.BlobFragments;
for (int i = 0; i < packet.Fragments.Count; i++)
{
var fragment = (ServerPacketFragment)packet.Fragments[i];
uint fragmentsRequired = ((uint)fragment.Data.Length / PacketFragment.MaxFragmentDataSize);
if ((fragment.Data.Length % PacketFragment.MaxFragmentDataSize) != 0)
{
fragmentsRequired++;
}
if (fragmentsRequired > 1u)
{
fragment.Data.Seek(0L, SeekOrigin.Begin);
uint dataToSend = (uint)fragment.Data.Length;
uint fragmentSeq = connectionData.FragmentSequence++;
for (uint j = 0u; j < fragmentsRequired; j++)
{
uint fragmentSize = dataToSend > PacketFragment.MaxFragmentDataSize ? PacketFragment.MaxFragmentDataSize : dataToSend;
byte[] data = new byte[fragmentSize];
fragment.Data.Read(data, 0, (int)fragmentSize);
var newPacket = new ServerPacket(packet.Header.Id, PacketHeaderFlags.EncryptedChecksum | PacketHeaderFlags.BlobFragments);
var newFragment = new ServerPacketFragment(fragment.Header.Group);
newFragment.Header.Sequence = fragmentSeq;
newFragment.Header.Id = 0x80000000;
newFragment.Header.Count = (ushort)fragmentsRequired;
newFragment.Header.Index = (ushort)j;
newFragment.Data.Write(data, 0, (int)fragmentSize);
newPacket.Fragments.Add(newFragment);
SendPacket(type, newPacket, session, true);
dataToSend -= fragmentSize;
}
buffer = null;
return(false);
}
fragment.Header.Size = (ushort)(PacketFragmentHeader.HeaderSize + fragment.Payload.BaseStream.Length);
if (!useHeaders)
{
fragment.Header.Sequence = connectionData.FragmentSequence++;
fragment.Header.Id = 0x80000000; // this seems to be a global incremental value
fragment.Header.Count = 1;
fragment.Header.Index = (ushort)i;
}
packetWriter.Write(fragment.Header.GetRaw());
packetWriter.Write(fragment.Data.ToArray());
}
}
if (packet.Header.HasFlag(PacketHeaderFlags.EncryptedChecksum) && connectionData.PacketSequence < 2)
{
connectionData.PacketSequence = 2;
}
packet.Header.Sequence = connectionData.PacketSequence++;
packet.Header.Size = (ushort)(packetWriter.BaseStream.Length - PacketHeader.HeaderSize);
packet.Header.Table = 0x14;
packet.Header.Time = (ushort)connectionData.ServerTime;
uint issacXor;
packet.Header.Checksum = packet.CalculateChecksum(session, type, 0u, out issacXor);
packetWriter.Seek(0, SeekOrigin.Begin);
packetWriter.Write(packet.Header.GetRaw());
if (type == ConnectionType.World && packet.Header.Sequence >= 2u)
{
session.CachedPackets.TryAdd(packet.Header.Sequence, new CachedPacket(issacXor, packet));
}
buffer = packetStream.ToArray();
return(true);
}
}
}
/// <summary>
/// This function handles turning a bundle of messages (representing all messages accrued in a timeslice),
/// into 1 or more packets, combining multiple messages into one packet or spliting large message across
/// several packets as needed.
///
/// 1 Create Packet
/// 2 If first packet for this bundle, fill any optional headers
/// 3 Append fragments that will fit
/// 3.1 Check each fragment to see if it is a partial fit
/// 4 If we have a partial message remaining or more messages, create additional packets.
/// </summary>
/// <param name="bundle"></param>
private void SendBundle(NetworkBundle bundle)
{
bool firstPacket = true;
MessageFragment carryOverMessage = null;
while (firstPacket || carryOverMessage != null || bundle.Messages.Count > 0)
{
ServerPacket packet = new ServerPacket();
PacketHeader packetHeader = packet.Header;
if (bundle.encryptedChecksum)
{
packetHeader.Flags |= PacketHeaderFlags.EncryptedChecksum;
}
uint availableSpace = Packet.MaxPacketDataSize;
if (firstPacket)
{
firstPacket = false;
if (bundle.SendAck) //0x4000
{
packetHeader.Flags |= PacketHeaderFlags.AckSequence;
packet.BodyWriter.Write(lastReceivedSequence);
}
if (bundle.TimeSync) //0x1000000
{
packetHeader.Flags |= PacketHeaderFlags.TimeSynch;
packet.BodyWriter.Write(ConnectionData.ServerTime);
}
if (bundle.ClientTime != -1f) //0x4000000
{
packetHeader.Flags |= PacketHeaderFlags.EchoResponse;
packet.BodyWriter.Write(bundle.ClientTime);
packet.BodyWriter.Write((float)ConnectionData.ServerTime - bundle.ClientTime);
}
availableSpace -= (uint)packet.Data.Length;
}
if (carryOverMessage != null || bundle.Messages.Count > 0)
{
packetHeader.Flags |= PacketHeaderFlags.BlobFragments;
while (carryOverMessage != null || bundle.Messages.Count > 0)
{
if (availableSpace <= PacketFragmentHeader.HeaderSize + 4)
{
break;
}
MessageFragment currentMessageFragment;
if (carryOverMessage != null)
{
currentMessageFragment = carryOverMessage;
carryOverMessage = null;
currentMessageFragment.index++;
}
else
{
currentMessageFragment = new MessageFragment(bundle.Messages.Dequeue());
}
var currentGameMessage = currentMessageFragment.message;
ServerPacketFragment fragment = new ServerPacketFragment();
PacketFragmentHeader fragmentHeader = fragment.Header;
availableSpace -= PacketFragmentHeader.HeaderSize;
currentMessageFragment.sequence = currentMessageFragment.sequence == 0 ? ConnectionData.FragmentSequence++ : currentMessageFragment.sequence;
uint dataToSend = (uint)currentGameMessage.Data.Length - currentMessageFragment.position;
if (dataToSend > availableSpace)
{
dataToSend = availableSpace;
carryOverMessage = currentMessageFragment;
}
if (currentMessageFragment.count == 0)
{
uint remainingData = (uint)currentGameMessage.Data.Length - dataToSend;
currentMessageFragment.count = (ushort)(Math.Ceiling((double)remainingData / PacketFragment.MaxFragmentDataSize) + 1);
}
fragmentHeader.Sequence = currentMessageFragment.sequence;
fragmentHeader.Id = 0x80000000;
fragmentHeader.Count = currentMessageFragment.count;
fragmentHeader.Index = currentMessageFragment.index;
fragmentHeader.Group = (ushort)currentMessageFragment.message.Group;
currentGameMessage.Data.Seek(currentMessageFragment.position, SeekOrigin.Begin);
fragment.Content = new byte[dataToSend];
currentGameMessage.Data.Read(fragment.Content, 0, (int)dataToSend);
currentMessageFragment.position = currentMessageFragment.position + dataToSend;
availableSpace -= dataToSend;
packet.AddFragment(fragment);
//break;
}
}
PacketQueue.Enqueue(packet);
}
}
public CachedPacket(uint issacXor, ServerPacket packet)
{
IssacXor = issacXor;
Packet = packet;
}
public static void HandlePacket(ConnectionType type, ClientPacket packet, Session session)
{
if (!CheckPacketHeader(packet, session))
{
// server treats all packets sent during the first 30 seconds as invalid packets due to server crash, this will move clients to the disconnect screen
if (DateTime.Now < WorldManager.WorldStartTime.AddSeconds(30d))
{
session.SendCharacterError(CharacterError.ServerCrash);
}
return;
}
// CLinkStatusAverages::OnPingResponse
if (packet.Header.HasFlag(PacketHeaderFlags.EchoRequest))
{
var connectionData = (type == ConnectionType.Login ? session.LoginConnection : session.WorldConnection);
// used to calculate round trip time (ping)
// client calculates: currentTime - requestTime - serverDrift
var echoResponse = new ServerPacket((ushort)(type == ConnectionType.Login ? 0x0B : 0x18), PacketHeaderFlags.EncryptedChecksum | PacketHeaderFlags.EchoResponse);
echoResponse.Payload.Write(packet.HeaderOptional.ClientTime);
echoResponse.Payload.Write((float)connectionData.ServerTime - packet.HeaderOptional.ClientTime);
NetworkManager.SendPacket(type, echoResponse, session);
}
// ClientNet::HandleTimeSynch
if (packet.Header.HasFlag(PacketHeaderFlags.TimeSynch))
{
var connectionData = (type == ConnectionType.Login ? session.LoginConnection : session.WorldConnection);
// used to update time at client and check for overspeed (60s desync and client will disconenct with speed hack warning)
var timeSynchResponse = new ServerPacket((ushort)(type == ConnectionType.Login ? 0x0B : 0x18), PacketHeaderFlags.EncryptedChecksum | PacketHeaderFlags.TimeSynch);
timeSynchResponse.Payload.Write(connectionData.ServerTime);
NetworkManager.SendPacket(type, timeSynchResponse, session);
}
if (packet.Header.HasFlag(PacketHeaderFlags.RequestRetransmit))
{
foreach (uint sequence in packet.HeaderOptional.RetransmitData)
{
CachedPacket cachedPacket;
if (session.CachedPackets.TryGetValue(sequence, out cachedPacket))
{
if (!cachedPacket.Packet.Header.HasFlag(PacketHeaderFlags.Retransmission))
{
cachedPacket.Packet.Header.Flags |= PacketHeaderFlags.Retransmission;
uint issacXor;
cachedPacket.Packet.Header.Checksum = packet.CalculateChecksum(session, ConnectionType.World, cachedPacket.IssacXor, out issacXor);
}
NetworkManager.SendPacketDirect(ConnectionType.World, cachedPacket.Packet, session);
}
}
}
if (packet.Header.HasFlag(PacketHeaderFlags.LoginRequest))
{
AuthenticationHandler.HandleLoginRequest(packet, session);
return;
}
if (packet.Header.HasFlag(PacketHeaderFlags.WorldLoginRequest))
{
AuthenticationHandler.HandleWorldLoginRequest(packet, session);
return;
}
if (packet.Header.HasFlag(PacketHeaderFlags.ConnectResponse))
{
if (type == ConnectionType.Login)
{
AuthenticationHandler.HandleConnectResponse(packet, session);
return;
}
AuthenticationHandler.HandleWorldConnectResponse(packet, session);
return;
}
if (packet.Header.HasFlag(PacketHeaderFlags.Disconnect))
{
HandleDisconnectResponse(packet, session);
}
foreach (ClientPacketFragment fragment in packet.Fragments)
{
var opcode = (FragmentOpcode)fragment.Payload.ReadUInt32();
if (!fragmentHandlers.ContainsKey(opcode))
{
Console.WriteLine($"Received unhandled fragment opcode: 0x{(uint)opcode:X4}");
}
else
{
FragmentHandlerInfo fragmentHandlerInfo;
if (fragmentHandlers.TryGetValue(opcode, out fragmentHandlerInfo))
{
if (fragmentHandlerInfo.Attribute.State == session.State)
{
fragmentHandlerInfo.Handler.Invoke(fragment, session);
}
}
}
}
}
