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I’m writing an FTP server with Java, and now I want to answer to LIST command.Sending only file names is enough, and I don’t need to send file size, owner, permission, etc. It seems that just sending some strings, as file names, does not satisfy the client (I tried both ASCII and binary formats). How can I find out what does an FTP client expect as a reply?
If you want to create a compatible FTP server, you need to handle LIST and NLST (standard commands) and also MLST and MLSD extension commands.
Format for LIST command is not defined anywhere and there are about 400 formats encountered in the world. Using Unix ls format or Windows DIR format would work with most clients as these are formats quite widespread and well supported by the clients.
NLST is the list of file names only.
MLST and MLSD use the machine-parseable format (this is what M letter stands for) which is described in RFC 3659. It’s easier for the clients to handle and it’s support is very welcome.