Programming language: Go
License: MIT License
Tags: Networking    

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Go FTP server framework. By providing a simple driver class that responds to a handful of methods you can have a complete FTP server.

Some sample use cases include persisting data to:

  • an Amazon S3 bucket
  • a relational database
  • redis
  • memory

Full documentation for the package is available on godoc


go get github.com/koofr/graval


go run example/example.go


To boot an FTP server you will need to provide a driver that speaks to your persistence layer - the required driver contract is listed below.

Do not forget to seed math random in your main program. Otherwise passive ports will be predictable.

func main() {

The Driver Contract

Your driver MUST implement a number of simple methods. You can view the required contract in the package docs on godoc



FTP is an incredibly insecure protocol. Be careful about forcing users to authenticate with a username or password that are important.


This library is distributed under the terms of the MIT License. See the included file for more detail.


All suggestions and patches welcome, preferably via a git repository I can pull from. If this library proves useful to you, please let me know.

Further Reading

There are a range of RFCs that together specify the FTP protocol. In chronological order, the more useful ones are:

For an english summary that's somewhat more legible than the RFCs, and provides some commentary on what features are actually useful or relevant 24 years after RFC959 was published:

For a history lesson, check out Appendix III of RCF959. It lists the preceding (obsolete) RFC documents that relate to file transfers, including the ye old RFC114 from 1971, "A File Transfer Protocol"

This library is heavily based on em-ftpd, an FTPd framework with similar design goals within the ruby and EventMachine ecosystems. It worked well enough, but you know, callbacks and event loops make me something something.

TLS implementation and some other commands are based on pyftpdlib.

*Note that all licence references and agreements mentioned in the graval README section above are relevant to that project's source code only.