private void ProcessAcknowledgment(IPEndPoint remoteEndPoint, TftpPacket requestPacket)
{
var position = requestPacket.BlockNumber * _blockSize;
if (position >= _fileInfo.Length)
{
Console.WriteLine("File transfer successfully finished");
return;
}
var length = Math.Min(_blockSize, (Int32)_fileInfo.Length - position);
using (var writer = new TftpPacketWriter(_fileBlock))
{
writer.WriteUInt16((UInt16)TftpPacketType.Data);
writer.WriteUInt16((UInt16)(requestPacket.BlockNumber + 1));
using (var fileStream = new FileStream(_fileInfo.FullName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
fileStream.Position = position;
fileStream.Read(_fileBlock, 4, (Int32)length);
}
SendData(_fileBlock, length + 4, remoteEndPoint);
}
}
private void ProcessReadRequest(IPEndPoint remoteEndPoint, TftpPacket requestPacket)
{
if (String.IsNullOrEmpty(requestPacket.FileName))
{
return; // TODO
}
if (requestPacket.Mode != TftpMode.Octet)
{
SendError(TftpError.IllegalOperation, "Transfer mode not supported", remoteEndPoint);
return;
}
var fileName = requestPacket.FileName.Replace('/', '\\');
if ('\\' == fileName[0])
{
fileName = fileName.Substring(1);
}
fileName = Path.Combine(_rootDirectory, fileName);
Console.WriteLine("Local file name: '{0}'", fileName);
_fileInfo = new FileInfo(fileName);
if (!_fileInfo.Exists)
{
SendError(TftpError.FileNotFound, "File not found", remoteEndPoint);
return;
}
var responsePacket = new TftpPacket(TftpPacketType.OptionAcknowledgment);
if (0 == requestPacket.TSize)
{
responsePacket.Options.Add("tsize", (Int32)_fileInfo.Length);
}
_blockSize = 512;
if (requestPacket.BlockSize > 0)
{
_blockSize = requestPacket.BlockSize;
responsePacket.Options.Add("blksize", _blockSize);
}
_fileBlock = new byte[_blockSize + 4];
_timeout = -1; // TODO: implement
if (requestPacket.Timeout > 0)
{
_timeout = requestPacket.Timeout;
responsePacket.Options.Add("timeout", _timeout);
}
SendData(responsePacket.ToArray(), remoteEndPoint);
}
protected override void ProcessRequest(IPEndPoint remoteEndPoint, Byte[] data, int dataLength)
{
var requestPacket = new TftpPacket(data, dataLength);
Console.WriteLine("*** TFTP packet type {0} received on port {1}", requestPacket.Type, Port);
switch (requestPacket.Type)
{
case TftpPacketType.ReadRequest:
Console.WriteLine("FileName: '{0}'", requestPacket.FileName);
Console.WriteLine("Mode: {0}", requestPacket.Mode);
Console.WriteLine("BlockSize: {0}", requestPacket.BlockSize);
Console.WriteLine("Timeout: {0}", requestPacket.Timeout);
Console.WriteLine("TSize: {0}", requestPacket.TSize);
Console.WriteLine("WindowSize: {0}", requestPacket.WindowSize);
Console.WriteLine("Multicast: {0}", requestPacket.Multicast);
ProcessReadRequest(remoteEndPoint, requestPacket);
break;
case TftpPacketType.WriteRequest:
Console.WriteLine("FileName: '{0}'", requestPacket.FileName);
Console.WriteLine("Mode: {0}", requestPacket.Mode);
Console.WriteLine("BlockSize: {0}", requestPacket.BlockSize);
Console.WriteLine("Timeout: {0}", requestPacket.Timeout);
Console.WriteLine("TSize: {0}", requestPacket.TSize);
Console.WriteLine("WindowSize: {0}", requestPacket.WindowSize);
SendNotSupportedError(remoteEndPoint);
break;
case TftpPacketType.Data:
Console.WriteLine("BlockNumber: {0}", requestPacket.BlockNumber);
Console.WriteLine("Data: {0} bytes", requestPacket.Data.Length);
SendNotSupportedError(remoteEndPoint);
break;
case TftpPacketType.Acknowledgment:
Console.WriteLine("BlockNumber: {0}", requestPacket.BlockNumber);
ProcessAcknowledgment(remoteEndPoint, requestPacket);
break;
case TftpPacketType.Error:
Console.WriteLine("ErrorCode: {0}", requestPacket.ErrorCode);
Console.WriteLine("ErrorMessage: '{0}'", requestPacket.ErrorMessage);
break;
case TftpPacketType.OptionAcknowledgment:
SendNotSupportedError(remoteEndPoint);
break;
default:
SendNotSupportedError(remoteEndPoint);
return;
}
}
