/// <summary>
/// Sends a keepalive packet (FLAP channel 5)
/// </summary>
/// <param name="threadstate">Always <c>null</c></param>
private void SendKeepalive(object threadstate)
{
using (ByteStream stream = new ByteStream())
{
FLAPHeader fh;
fh.Channel = 0x05;
fh.DatagramSequenceNumber = 0;
fh.DataSize = 0;
stream.PrependOscarHeaders(fh, null);
try
{
byte[] keepalive = stream.GetBytes();
Marshal.InsertUshort(keepalive, (ushort)FLAPSequence, 2);
lock (socket)
{
socket.Write(keepalive);
}
Logging.WriteString("Sent keepalive over connection {0}", ID);
}
catch (Exception ex)
{
if (!isDisconnecting)
{
Logging.WriteString("Couldn't send keepalive: {0}, connection {1}", ex.Message, ID);
DisconnectFromServer(true);
}
}
keepAliveTimer.Change(60000, Timeout.Infinite);
}
}
/// <summary>
/// This method is invoked when the connection is complete
/// </summary>
protected virtual void OnConnectionFinished()
{
Connecting = true;
// Read in the first ten bytes (6 byte FLAP channel 0x01 + 0x00000001)
// of the connection handshake
byte[] serverhandshake = new byte[10];
try
{
int bytesreceived = 0;
int receiveindex = 0;
lock (socket)
{
while (bytesreceived < 10)
{
bytesreceived = socket.Read(serverhandshake, receiveindex, 10 - receiveindex);
receiveindex += bytesreceived;
}
}
}
catch (Exception ex)
{
Logging.WriteString("Can't read handshake from server: {0}, connection {1}", ex.Message, ID);
DisconnectFromServer(true);
return;
}
finally
{
serverhandshake = null;
}
// Construct our reply to the connection handshake
using (ByteStream clientHandshake = new ByteStream())
{
FLAPHeader fh;
fh.Channel = 0x01;
fh.DatagramSequenceNumber = FLAPSequence;
fh.DataSize = (ushort)(4 + ((cookie == null) ? 0 : 4 + cookie.GetByteCount()));
clientHandshake.PrependOscarHeaders(fh, null);
clientHandshake.WriteUint(Constants.PROTOCOL_VERSION);
if (cookie != null)
{
clientHandshake.WriteUshort(0x0006);
clientHandshake.WriteUshort((ushort)cookie.GetByteCount());
clientHandshake.WriteByteArray(cookie.ToByteArray());
}
try
{
lock (socket)
{
socket.Write(clientHandshake.GetBytes());
}
}
catch (Exception ex)
{
Logging.WriteString("Couldn't send handshake to server: {0}, connection {1}", ex.Message, ID);
DisconnectFromServer(true);
return;
}
}
StopTimeoutPeriod();
Connecting = true;
// And the handshaking is done. Auth connection will send
// SNAC(17,06) and any other connection will receive SNAC(01,03)
OnServerConnectionCompleted();
}
