Package: py3tftp
Py3tftpPy3tftp is an asynchronousTFTPserver written in Python 3. It was written for the pure joy of working with Python 3 and implementsRFC 1350(exceptmailmode),RFC 2347(options),RFC 2348(blksize option),RFC 2349(timeout, tsize), andRFC 7440(windowsize) for RRQ. Additionally, it supports block number roll over, so files of any size can be transferred over.While a toy project, it does adhere to enough of the standards to be useful in real life.Some Py3k stuff it uses:asyncio -Transports and Protocolsfor networking.asyncio -Tasksfor spinning up extra handlers.New unpacking methods- some sweet stuff right there (3.5+)Tracebacks attached to exceptions- woo!Strings are now bytes because all text is unicodeThis project is in maintenance mode!It is not actively developed, but it provides a solid minimum set of functionality and works on Python versions 3.5 though 3.9.If you would like more functionality or if you find a bug, please open a PR :).Installationpip install py3tftpUsageInvoking pyt3tftp will start a server that will interact with the current working directory - it will read and write files from it so don't run it in a place with sensitive files!TFTP has no security features, except for its simplicity:It won't overwrite files.Won't create non-existant directories.Cannot write outside of the directory it's running from.usage: py3tftp [-h] [--host HOST] [-p PORT] [--ack-timeout ACK_TIMEOUT]
                   [--timeout TIMEOUT] [-l FILE_LOG] [-v] [--version]

optional arguments:
  -h, --help            show this help message and exit
  --host HOST           IP of the interface the server will listen on.
                        Default: 0.0.0.0
  -p PORT, --port PORT  Port the server will listen on. Default: 9069. TFTP
                        standard-compliant port: 69 - requires superuser
                        privileges.
  --ack-timeout ACK_TIMEOUT
                        Timeout for each ACK of the lock-step. Default: 0.5.
  --timeout TIMEOUT     Timeout before the server gives up on a transfer and
                        closes the connection. Default: 3.
  -l FILE_LOG, --file-log FILE_LOG
                        Append output to log file.
  -v, --verbose         Enable debug-level logging.
  --versionTestingI wrote some simple acceptance tests intests/acceptance/*_test.py. The code is messy as it's meant to be thrown away.# runs the server with python -m py3tftp
# runs unittests under tests/
# kills the server
./.travis/run.shExtending py3tftpThe way that this module works is that there's a subclass ofBaseTFTPServerProtocolscheduled on the IO loop that listens for incoming TFTP requests and decides what kind ofBaseTFTPProtocolto schedule on the IO loop to handle the incoming request.The way this works in the default scenario is thatTFTPServerProtocollistens to incoming requests. When a request comes in, it selects either theWRQProtocolor theRRQProtocolto create a task in the IO loop and passes the request to the selected protocol upon instantiation. From then on, the instantiated protocol handles all of the communication with the client and theTFTPServerProtocolgoes back to listening for requests.This amazing diagram illustrates the above process in the case of a RRQ request:Extending py3tftp is as easy as:SubclassingBaseTFTPServerProtocol, mainly to implement theselect_protocolmethod to select your custom protocol.Subclassing eitherRRQProtocolorWRQProtocolto implement your own logic (new options, file handling, etc.) for standard WRQ and RRQ requests, OR...SubclassingBaseTFTPProtocolto implement your own logic for a custom type of request.Roadplan(Note, this hasn't been updated in a few years)fix off-by-one blksize error ie. if you transfer a file 1000 bytes long and set blksize to 1000 bytes, the server won't ack it.Pull out file reader/writer from protocol classes.Add tsize from RFC 2349(added by schrd).Addblksize,timeout, and tsize tests.Possibly implement RFCs 906 and 951 for fun!Refactor the code, get rid of some duplication, optimize some low-hanging fruit.LICENSEThe MIT License (MIT)Copyright (c) 2016-2021 sirMackkPermission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
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copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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