TFTP (Trivial File Transfer Protocol) client and server implementation in Python.

RFCs supported:

• 1350 - The TFTP Protocol (Revision 2)
• 2347 - TFTP Option Extension
• 2348 - TFTP Blocksize Option
• 7440 - TFTP Windowsize Option

Additional features:

• Block ID rollover for sending large files

Limitations:

• Only octet transfer mode is supported
• Timeouts will work incorrectly in case of a malicious client sending invalid packets (after receiving an invalid packet, the timeout timer will be reset)

• Python 3.6+

Client:

client.py -g <filename> <server-hostname> [port]

Use -p instead of -g to upload (--put) the file instead of downloading (--get).

Server:

server.py [-p <port>] <server-root>

There is also --help option available that explains all the options available, such as block and window size for the client and disabling uploads for the server.