A simple File Transfer Protocal based on TFTP.
Differences from TFTP are:
- Instead of using sequential ACKS, the program uses sliding windows.
- Messages with OPCODE ERR are not sent in response to recieving a message from another client, as I bind the server and client to each other and only read/write to that bound connection.
- The string encoding type for the filename is not included in the RRQ/WRQ.
- You can choose to randomly 'drop' 1% of the packets.
Client.java contains the main method for the client side. Likewise Server.java contains the main method for the server side.
Website showing the results can be found here.
Write a file transfer program. To demonstrate, you'll need a client and a server program:
- The server awaits connections.
- A client connects, and indicates the name of a file to upload or download.
- The client sends or receives the file.
Wherever applicable, use the commands and protocol for TFTP (IETF RFC 1350), with the following modifications. You will need to design and use additional packet header information than that in TFTP; use the IETF 2347 TFTP Options Extension when possible.
- Use TCP-style sliding windows rather than the sequential acks used in TFTP. Test with at least two different max window sizes.
- Arrange that each session begins with a (random) number exchange to generate a key that is used for encrypting data. You can just use Xor to create key, or anything better.
- Support only binary (octet) transmission.
- Support a command line argument controlling whether to randomly drop 1 percent of the packets;
Create a web page showing throughput across varying conditions: at least 2 different pairs of hosts, different window sizes; drops vs no drops;