Please prefix the subject line with the Commons Component in future (as above)
On 22 January 2017 at 09:12, Oliver Zemann <oliver.zem...@gmail.com> wrote: > 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 [33m ~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 [32m.::WAIT::. welcome!. The login has completed here > 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??? Note that FileZilla detects this as an error, so clearly this is not expected behaviour. Commons NET only looks for a reply when one is expected, so it cannot detect this. AFAICS changing this would require a major rewrite. Since the server appears to be broken, it's not worth doing this. > 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 "/" [34m<<<>>>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? This seems to be a bug in the server. It is not supposed to send unsolicited data on the command channel. You might be able to subclass one of the FTP classes and over-ride one of the methods so it ignores MODE Z if it's not expected. > Some information: i dont have control over that server. I dont know what > software the server is running. Try contacting the server maintainers to raise the issue of the server's bad behaviour > Regards > Oli > > --------------------------------------------------------------------- > To unsubscribe, e-mail: user-unsubscr...@commons.apache.org > For additional commands, e-mail: user-h...@commons.apache.org > --------------------------------------------------------------------- To unsubscribe, e-mail: user-unsubscr...@commons.apache.org For additional commands, e-mail: user-h...@commons.apache.org
