public static BabelMessage CreateHandshakeMessage(MessageExchange exchange,
Router.RouterAction dispatch, byte postNetIfIndex, byte pid, byte arg)
{
BabelMessage m = new BabelMessage(exchange);
m.IsHandshake = true;
m.IsGeneral = false;
m.Pid = pid;
m.Arg = arg;
m.PostNetIfIndex = postNetIfIndex;
m.Dispatch = dispatch;
m.IncomingNetIfIndex = ProtocolConstants.NETIF_UNSET;
m.OutgoingNetIfIndex = ProtocolConstants.NETIF_UNSET;
return(m);
}
public static BabelMessage CreateCommandMessage(MessageExchange exchange, bool verified,
Router.RouterAction dispatch, byte postNetIfIndex, byte cmd, ushort receiver,
ushort sender, byte flagsRS, byte ident, byte dataLen, byte dataOffset, byte[] dataAry)
{
BabelMessage m;
if (dataLen >= ProtocolConstants.GENERAL_TAIL_SIZE)
{
return(null); // Longer messages not implemented yet.
}
m = new BabelMessage(exchange);
m.IsHandshake = false;
m.IsGeneral = true;
m.Verified = verified;
m.PostNetIfIndex = postNetIfIndex;
m.Dispatch = dispatch;
m.IncomingNetIfIndex = ProtocolConstants.NETIF_UNSET;
m.OutgoingNetIfIndex = ProtocolConstants.NETIF_UNSET;
m.Cmd = cmd;
m.Receiver = receiver;
m.Sender = sender;
m.FlagsRS = flagsRS;
m.SenderId = ident;
m.DataLen = dataLen;
if (dataOffset <= 0)
{
m.DataAry = dataAry;
}
else
{
byte[] ary = new byte[dataAry.Length + dataOffset];
Array.Copy(dataAry, 0, ary, dataOffset, dataAry.Length);
m.DataAry = ary;
}
return(m);
}
// Helper routine for accessing messages.
// ioIndex must point to a valid message, i.e. meta is set.
// Returns 0 on success.
// Returns error code on parse failure.
public byte StartMessageTransaction(int ioIndex)
{
MsgBuffer = Manager.IoBuffers[ioIndex];
IoIndex = ioIndex;
ChangeDir = false;
Finish = FinishAction.Free; // Free messages by default: prevents unhandled recursions.
Dispatch = Router.RouterAction.PostToNetIf;
TaskCmd = 0;
ReturnCmd = 0;
ONetIfIndex = MsgBuffer.iNetIf;
switch (MsgBuffer.flagsPid & ProtocolConstants.META_FLAGS_PID)
{
case ProtocolConstants.PID_GENERAL_V:
MsgBuffer.flagsPid &= ProtocolConstants.META_FLAGS_PID; // Clear out any resend value.
break;
case ProtocolConstants.PID_GENERAL:
break;
default:
return(100);
}
return(0);
}