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From "Alexander Schuetz (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (NET-470) DataConnection-Socket hangs on InputStream.read()
Date Wed, 13 Jun 2012 11:13:42 GMT

    [ https://issues.apache.org/jira/browse/NET-470?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13294353#comment-13294353
] 

Alexander Schuetz commented on NET-470:
---------------------------------------

Here you are:

{color:blue}
{{220 PSFTPd. Secure FTP Server ready}}
{{Connected to ******** on 990}}
{{USER *******}}
{{331 Password required for *******}}
{{PASS *******}}
{{230 User ******* logged in}}
{{SYST}}
{{215 UNIX Type: L8}}
{{Remote system is UNIX Type: L8}}
{{PBSZ 0}}
{{200 PBSZ 0 successful}}
{{PROT P}}
{{200 Data connection set to: Private}}
{{TYPE I}}
{{200 TYPE set to BINARY}}
{{PASV}}
{{227 Entering passive mode (217,70,161,93,39,12)}}
{{LIST}}
{{150 Opening ASCII mode data connection}}
{color}
{color:red}
java.net.SocketTimeoutException: Read timed out
   at java.net.SocketInputStream.socketRead0(Native Method)
   at java.net.SocketInputStream.read(SocketInputStream.java:150)
   at java.net.SocketInputStream.read(SocketInputStream.java:121)
   at sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283)
   at sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325)
   at sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)
   at java.io.InputStreamReader.read(InputStreamReader.java:184)
   at java.io.BufferedReader.fill(BufferedReader.java:154)
   at java.io.BufferedReader.readLine(BufferedReader.java:317)
   at java.io.BufferedReader.readLine(BufferedReader.java:382)
   at org.apache.commons.net.ftp.FTPFileEntryParserImpl.readNextEntry(FTPFileEntryParserImpl.java:52)
   at org.apache.commons.net.ftp.FTPListParseEngine.readStream(226 Directory send OK FTPListParseEngine.java:133)
   at org.apache.commons.net.ftp.FTPListParseEngine.readServerList(FTPListParseEngine.java:102)
   at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:3103)
   at org.apache.commons.net.ftp.FTPClient.initiateListParsing(FTPClient.java:3072)
   at org.apache.commons.net.ftp.FTPClient.listFiles(FTPClient.java:2731)
   at testapplication.ftp.FTPClientExample.main(FTPClientExample.java:335)
{color}

This was produced using Netbeans 7, JDK 1.7 and a slightly changed version of {http://www.google.de/url?sa=t&rct=j&q=ftpclientexample%20java&source=web&cd=1&ved=0CFIQFjAA&url=http%3A%2F%2Fcommons.apache.org%2Fnet%2Fexamples%2Fftp%2FFTPClientExample.java&ei=83LYT7iSH4TKsgaA_ejjDw&usg=AFQjCNHYEWShtZ-WVhvvFvmnjmsfWanevg&cad=rja]

I'll attach a diff with the modifications. Arguments are "-l -b -p SSL,true" and of course
the login and server preferences.

                
> DataConnection-Socket hangs on InputStream.read()
> -------------------------------------------------
>
>                 Key: NET-470
>                 URL: https://issues.apache.org/jira/browse/NET-470
>             Project: Commons Net
>          Issue Type: Bug
>          Components: FTP
>    Affects Versions: 3.1
>         Environment: Windows 7 (x86), Netbeans 7, JDK 1.6 and JDK 1.7
>            Reporter: Alexander Schuetz
>
> I'm using ftps (SSL/implicit) and passive mode. connect(), login() and cwd() commands
work well.
> But if I have to open a data connection (for example for LIST) the socket is opened successfully
using one of the desired "dataports". The underlying InputStream is created as well without
any Exception.
> But then every attempt to read from the InputStream will eventually time out or hang
forever (depending on the DataTimeout-value).
> If I use the FileZilla client, everything works successfully and fast. FileZilla issues
the following commands:
> {color:blue}
> {{C: SYST}}
> {{A: 215 UNIX Type: L8}}
> {{C: FEAT}}
> {{A: 211-Extensions supported}}
> {{A:  SIZE}}
> {{A:  REST}}
> {{A:  MDTM}}
> {{A:  MFMT YYYYMMDDHHMMSS filename}}
> {{A:  MDTM YYYYMMDDHHMMSS filename}}
> {{A:  MDTM YYYYMMDDHHMMSS[+-TZ] filename}}
> {{A:  XCRC filename}}
> {{A:  XMD5 filename}}
> {{A:  AUTH TLS}}
> {{A:  AUTH SSL}}
> {{A:  MODE Z}}
> {{A:  PBSZ}}
> {{A:  PROT}}
> {{A: 211 End of FEAT}}
> {{C: USER ********}}
> {{A: 331 Password required for ********}}
> {{C: PASS ********}}
> {{A: 230 User ******** logged in}}
> {{C: PBSZ 0}}
> {{A: 200 PBSZ 0 successful}}
> {{C: PROT P}}
> {{A: 200 Data connection set to: Private}}
> {{C: TYPE I}}
> {{A: 200 TYPE set to BINARY}}
> {{C: PASV}}
> {{A: 227 Entering passive mode (217,70,161,93,39,15)}}
> {{C: LIST}}
> {{A: 150 Opening ASCII mode data connection}}
> {{A: 226 Directory send OK}}
> {color}
> Issueing the commands "PBSZ 0" and "PROT P" before and calling enterLocalPassiveMode()
and setFileType(FTP.BINARY_FILE_TYPE) will produce the same commandsequence (without SYST
and FEAT), but with the error described above.
>               
> On top of that: disconnect() will block forever, originating from socket.close() which
is blocking. The only way to avoid this is calling logout() (even if login() wasn't issued).
Then disconnect will return as expected.

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