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List:       jakarta-commons-user
Subject:    Errorhandling of "bad" FTP Servers
From:       Oliver Zemann <oliver.zemann () gmail ! com>
Date:       2017-01-22 9:12:23
Message-ID: e4660f82-037c-48d2-9e74-7cde0a439ead () gmail ! com
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Hi, i would like to know how to handle FTP Servers that do not behave 
like they should (or behave different than most others).
For example, currently i would like to connect to one of those servers 
which sends " MODE Z" directly after a login (USER) which is interpreted 
wrong by apache commons ftp, as its assumed that there should be \d\d\d 
\w* like "220 all good my friend"
But its simply: " MODE Z"

Here is a log from filezilla which can handle this behaviour:
09:58:24    Trace:    CFtpControlSocket::SendNextCommand()
09:58:24    Befehl:    USER someUser
09:58:24    Trace:    CFtpControlSocket::OnReceive()
09:58:24    Antwort:    331  ~wait~ user ok, password?
09:58:24    Trace:    CFtpControlSocket::SendNextCommand()
09:58:24    Befehl:    PASS *******
09:58:25    Trace:    CFtpControlSocket::OnReceive()
09:58:25    Antwort:    230 .::WAIT::. welcome!.
09:58:25    Trace:    CFtpControlSocket::SendNextCommand()
09:58:25    Befehl:    SYST
09:58:25    Trace:    CFtpControlSocket::OnReceive()
09:58:25    Antwort:    215 Java (SE) Platform SE 6.0
09:58:25    Trace:    CFtpControlSocket::SendNextCommand()
09:58:25    Befehl:    FEAT
09:58:25    Trace:    CFtpControlSocket::OnReceive()
09:58:25    Antwort:    211-Extension supported
09:58:25    Antwort:     MDTM
09:58:25    Antwort:     MDTM
09:58:25    Antwort:     MDTM YYYYMMDDHHMMSS[+-TZ];filename
09:58:25    Antwort:     SIZE
09:58:25    Antwort:     SITE PSWD;EXEC;SET;INDEX;ZONE;CHMOD;MSG
09:58:25    Antwort:     XCRC filename;start;end
09:58:25    Antwort:    211 End
09:58:25    Status:    Der Server unterstützt keine Nicht-ASCII-Zeichen.
09:58:25    Status:    Angemeldet
09:58:25    Antwort:     MODE Z
09:58:25    Trace:    Unexpected reply, no reply was pending. <---- 
something like this in apache commons ftp???
09:58:25    Antwort:    211 End
09:58:25    Trace:    Unexpected reply, no reply was pending.
09:58:25    Status:    Empfange Verzeichnisinhalt...
09:58:25    Trace:    CFtpControlSocket::SendNextCommand()
09:58:25    Trace:    CFtpControlSocket::ChangeDirSend()
09:58:25    Befehl:    PWD
09:58:25    Trace:    CFtpControlSocket::OnReceive()
09:58:25    Antwort:    257 "/" <<<>>>OK<<<>>> Logged in ;).

That "MODE Z" is leading to an exception when i use FTPClient::login()
In __getReply(boolean reportReply)  i can see that its trying to convert 
the first 3 chars to a digit, which is of course impossible if its "Z 
MODE" and not a number.

So i am wondering whats the best way to handle such servers? Or is this 
a bug in apache commons ftp? Do i have to implement all calls myself and 
dont rely on login() logout() etc. from apache commons to be able to 
handle such behaviours?

Some information: i dont have control over that server. I dont know what 
software the server is running.

Regards
Oli

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