public void HandleDisconnect(SOEClient sender, SOEPacket packet)
{
// Setup a reader
SOEReader reader = new SOEReader(packet);
// Get the data from the packet
uint sessionID = reader.ReadUInt32();
ushort reason = reader.ReadUInt16();
// Handle
if (sessionID == sender.GetSessionID())
{
Console.WriteLine("Disconnecting");
Server.ConnectionManager.DisconnectClient(sender, reason, true);
}
}
private void ReceiveMessage(SOEPacket packet)
{
SOEReader reader = new SOEReader(packet);
// Have we received in order?
ushort sequenceNumber = reader.ReadUInt16();
if ((sequenceNumber != LastReceivedSequenceNumber + 1) && (sequenceNumber != 0))
{
ReceivedSequenceOutOfOrder(sequenceNumber);
return;
}
// Acknowledge
Acknowledge(sequenceNumber);
LastReceivedSequenceNumber = sequenceNumber;
// Get the SOEMessage
byte[] data = reader.ReadToEnd();
// Handle!
Client.ReceiveMessage(data);
}
private byte[] DecryptPacket(SOEClient sender, byte[] packet)
{
// Compressable?
if (!sender.IsEncrypted())
{
return packet;
}
// Setup our streams
SOEReader reader = new SOEReader(packet);
SOEWriter newPacket = new SOEWriter(reader.ReadUInt16());
// Skip the compression flag
reader.ReadByte();
// Get our data
int blockCount = (packet.Length - 3) / 4;
int byteCount = (packet.Length - 3) % 4;
uint key = sender.GetCRCSeed();
// Decrypt the blocks of 4 bytes
for (int i = 0; i < blockCount; i++)
{
uint temp = reader.ReadUInt32();
uint value = temp ^ key;
key = temp;
newPacket.AddUInt32(value);
}
// Decrypt the rest of the singular bytes
byte newKey = (byte)((key >> 24) & 0xFF);
for (int i = 0; i < byteCount; i++)
{
byte value = (byte)(reader.ReadByte() ^ newKey);
newPacket.AddByte(value);
}
// Return the decrypted packet
return newPacket.GetRaw();
}
private void ReceiveFragment(SOEPacket packet)
{
// Setup a reader
SOEReader reader = new SOEReader(packet);
reader.ReadUInt16();
// Have we already started a fragmented packet?
if (StartedFragmentedPacket)
{
// One less fragment till we need to acknowledge!
FragmentsTillAck--;
// Get our sequence number
uint previousFragmentSequenceNumber = FragmentSequenceNumber;
FragmentSequenceNumber = reader.ReadUInt16();
// Did we get a correct sequence number?
if (FragmentSequenceNumber != previousFragmentSequenceNumber + 1)
{
// Out of order!
ReceivedSequenceOutOfOrder(FragmentSequenceNumber);
return;
}
// Append the rest of the packet to the fragmented data
for (int i = 4; i < FragmentedData.Length; i++)
{
FragmentedData[ReceivedFragmentsSize] = reader.ReadByte();
ReceivedFragmentsSize++;
}
}
else
{
// We're expecting the starting packet
FragmentSequenceNumber = reader.ReadUInt16();
uint totalSize = reader.ReadUInt32();
// Is this a valid sequence number?
if ((FragmentSequenceNumber != LastReceivedSequenceNumber + 1) && (FragmentSequenceNumber != 0))
{
// Out of order!
ReceivedSequenceOutOfOrder(FragmentSequenceNumber);
return;
}
// Get the total size
FragmentedData = new byte[totalSize];
// How many fragments till we need to acknowledge
FragmentsTillAck = 4;
// Append the rest of the packet to the fragmented data
for (int i = 8; i < FragmentedData.Length; i++)
{
FragmentedData[ReceivedFragmentsSize] = reader.ReadByte();
ReceivedFragmentsSize++;
}
// Started a fragmented packet
StartedFragmentedPacket = true;
}
// Are we finished with the fragmented data?
if (ReceivedFragmentsSize >= FragmentedData.Length)
{
// Finish fragmented packet
StartedFragmentedPacket = false;
FragmentsTillAck = 0;
// Handle the fragmented packet as a RELIABLE_DATA packet
SOEWriter writer = new SOEWriter((ushort)SOEOPCodes.RELIABLE_DATA);
writer.AddBytes(FragmentedData);
SOEPacket wholePacket = writer.GetFinalSOEPacket(Client, false, false);
// Receive this packet!
Receive(wholePacket);
return;
}
// Do we need to acknowledge?
if (FragmentsTillAck == 0)
{
Acknowledge(FragmentSequenceNumber);
FragmentsTillAck = 5;
}
}
public void HandlePacket(SOEClient sender, byte[] rawPacket)
{
// Read the packet
SOEReader reader = new SOEReader(rawPacket);
ushort opCode = reader.ReadUInt16();
bool goodPacket = true;
// Get the packet data
byte[] data = new byte[rawPacket.Length - (int)sender.GetCRCLength()];
for (int i = 0; i < data.Length; i++)
{
data[i] = rawPacket[i];
}
// Get the CRC32 checksum for the packet
uint crc32 = sender.GetCRC32Checksum(data);
// Get our expected CRC32 checksum
uint expectedCRC32 = 0;
uint place = sender.GetCRCLength() - 1;
for (int i = rawPacket.Length - (int)sender.GetCRCLength(); i < rawPacket.Length; i++)
{
expectedCRC32 += (uint)(rawPacket[i] << (8 * (int)place));
place--;
}
// We have our CRCs! Check if the packet is formed correctly!
byte[] crc = BitConverter.GetBytes(crc32).Reverse().ToArray();
byte[] expectedCRC = BitConverter.GetBytes(expectedCRC32).Reverse().ToArray();
int start = 4 - (int)sender.GetCRCLength();
for (int i = start; i < sender.GetCRCLength(); i++)
{
// If they're not the same, we're a bad packet
if (crc[i] != expectedCRC[i])
{
// Set that we're bad, and get outta the loop
goodPacket = false;
break;
}
}
// Are we malformed?
if (!goodPacket)
{
Log("[WARNING] Received malformed packet! Incorrect CRC Appended!");
return;
}
// Remove the CRC
rawPacket = data;
// Do we need to worry about decryption/decompression?
if (sender.HasSession())
{
// Is the client encrypted?
if (sender.IsEncrypted())
{
rawPacket = DecryptPacket(sender, rawPacket);
}
// Is the client compressable?
if (sender.IsCompressable())
{
// It seems that all packets after 0x02 are compressable..
rawPacket = DecompressPacket(sender, rawPacket);
}
}
// Handle the decompressed/decrypted packet!
HandlePacket(sender, new SOEPacket(opCode, rawPacket));
}