public void CPacketHandler(object source, PacketHandlerArgs e)
{
// client recieves C packet, only accepts C packets with the correct tempclientkey
// client marks connection verified on receipt of C packet
// client sends D packet to the server, which is empty packet
// Client now considers connection "open"
if (!isserver) // client
{
byte[] packet = e.Data;
int tempnextposition = e.NextPosition;
int tempclientkey = (int)binarypacker.ReadValueFromBuffer(packet, ref tempnextposition, typeof(int));
LogFile.WriteLine("C packet received, tempclientkey: " + tempclientkey.ToString() + " our key: " + this.tempclientkey);
if (tempclientkey == this.tempclientkey)
{
SharedSecretKey = (int)binarypacker.ReadValueFromBuffer(packet, ref tempnextposition, typeof(int));
LogFile.WriteLine("Connection to server confirmed, sharedkey: " + SharedSecretKey.ToString());
Validated = true;
parent.OnConnectionValidated();
//parent.Send('D', new byte[] { });
}
else
{
LogFile.WriteLine("SharedSecretExchange. WARNING: potential spoof packet detected, allegedly from server " + Encoding.ASCII.GetString(e.Data, 0, e.Data.Length));
}
}
}
// handles incoming ack packets ('A' packets)
public void APacketHandler(object source, PacketHandlerArgs e)
{
//LogFile.WriteLine( "Processing 'A' packet: " );
byte[] packet = e.Data;
int nextposition = e.NextPosition;
while (nextposition < packet.Length)
{
short ackedpacketreference = (short)binarypacker.ReadValueFromBuffer(packet, ref nextposition, typeof(short));
// LogFile.WriteLine( " ... Packet " + ackedpacketreference.ToString() + " acked" );
sentpacketsawaitingack.Remove(ackedpacketreference);
}
DumpSentPacketsAwaitingAck();
}
// server sends C packet to client, which contains the shared key, and also the temporary client key the client sent
// server knows key now, client will receive it
// Packet format: [int32 xxx][short xxx][char 'C'][temporary client key][shared key]
// server replies to any R packet, generating the shared key if the connection didnt exist before
public void RPacketHandler(object source, PacketHandlerArgs e)
{
if (isserver)
{
byte[] packet = e.Data;
int tempnextposition = e.NextPosition;
int tempclientkey = (int)binarypacker.ReadValueFromBuffer(packet, ref tempnextposition, typeof(int));
LogFile.WriteLine("R packet received, sending C packet, tempclientkey: " + tempclientkey.ToString() + " sharedkey: " + SharedSecretKey.ToString());
byte[] newpacket = new byte[8];
tempnextposition = 0;
binarypacker.WriteValueToBuffer(newpacket, ref tempnextposition, tempclientkey);
binarypacker.WriteValueToBuffer(newpacket, ref tempnextposition, SharedSecretKey);
parent.SendNonAckable('C', newpacket);
if (!Validated)
{
Validated = true;
LogFile.WriteLine("Shared key sent; marking connection open");
parent.OnConnectionValidated();
}
}
}
// handles incoming ack packets ('A' packets)
public void APacketHandler( object source, PacketHandlerArgs e )
{
//LogFile.WriteLine( "Processing 'A' packet: " );
byte[] packet = e.Data;
int nextposition = e.NextPosition;
while( nextposition < packet.Length )
{
short ackedpacketreference = (short)binarypacker.ReadValueFromBuffer(packet, ref nextposition, typeof(short));
// LogFile.WriteLine( " ... Packet " + ackedpacketreference.ToString() + " acked" );
sentpacketsawaitingack.Remove( ackedpacketreference );
}
DumpSentPacketsAwaitingAck();
}