private void SendError(TftpError errorCode, String errorMessage, IPEndPoint remoteEndPoint)
{
Console.WriteLine("Sending error {0} '{1}'", errorCode, errorMessage);
using (var writer = new TftpPacketWriter(errorMessage.Length + 5))
{
writer.WriteUInt16((UInt16)TftpPacketType.Error);
writer.WriteUInt16((UInt16)errorCode);
writer.WriteString(errorMessage);
SendData(writer.ToArray(), remoteEndPoint);
}
}
// NOTE: TFTP packets use network byte order (big-endian). This does not appear to be mentioned in the RFC.
public static ITftpPacket Parse(byte[] bytes)
{
int index = 0;
TftpOperation op = (TftpOperation)EndianBitConverter.Big.ToUInt16(bytes, index);
index += 2;
string fileName;
TftpMode mode;
ushort blockNumber;
switch (op)
{
case TftpOperation.ReadRequest:
fileName = ParseNetascii(bytes, ref index);
mode = ParseMode(bytes, ref index);
return(new RrqPacket(fileName, mode));
case TftpOperation.WriteRequest:
fileName = ParseNetascii(bytes, ref index);
mode = ParseMode(bytes, ref index);
return(new WrqPacket(fileName, mode));
case TftpOperation.Data:
blockNumber = EndianBitConverter.Big.ToUInt16(bytes, index);
index += 2;
byte[] data = new byte[bytes.Length - index];
Buffer.BlockCopy(bytes, index, data, 0, data.Length);
return(new DataPacket(blockNumber, data));
case TftpOperation.Ack:
blockNumber = EndianBitConverter.Big.ToUInt16(bytes, index);
return(new AckPacket(blockNumber));
case TftpOperation.Error:
TftpError error = (TftpError)EndianBitConverter.Big.ToUInt16(bytes, index);
index += 2;
string message = ParseNetascii(bytes, ref index);
return(new ErrorPacket(error, message));
default:
throw new Exception("Operation not recognized.");
}
}
public ErrorPacket(TftpError error, string message)
{
Error = error;
Message = message;
}