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From "Goldstein Lyor (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SSHD-795) IOException (Broken pipe) on a socket local forwarding channel causes SSH client-server connection down
Date Thu, 01 Feb 2018 16:31:00 GMT

    [ https://issues.apache.org/jira/browse/SSHD-795?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16348855#comment-16348855
] 

Goldstein Lyor commented on SSHD-795:
-------------------------------------

Please publish it as a PR and I will be more than happy to review and comment on it - eventually
merging it in...

> IOException (Broken pipe) on a socket local forwarding channel causes SSH client-server
connection down
> -------------------------------------------------------------------------------------------------------
>
>                 Key: SSHD-795
>                 URL: https://issues.apache.org/jira/browse/SSHD-795
>             Project: MINA SSHD
>          Issue Type: Bug
>    Affects Versions: 1.7.0
>            Reporter: Roberto Deandrea
>            Priority: Major
>         Attachments: apache-sshd.trace.zip, brokenpipe.trace
>
>
> Hi,
> I have a problem with local port forwarding mechanism implemented in Apache SSHD.
> In my company we successfully use Apache SSHD library for secure local socket forwarding
protocols.
> When on a local port forwarding channel an IOException (Broken pipe) happen for some
reason (network, etc...), the SSH client server is being disconnected abruptly.
> I'm not convinced this is the right behavior. I think it is not necessary to bring down
SSH client server connection because this is not a protocol violation, but a socket problem
related to forwarded remote server connection.
> Please, can you comment about this issue ?
> Follow an excerpt of the traces :
> {quote}
> 2018-01-23 10:30:10,017 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-2       ] [Nio2Session.handleWriteCycleFailure]
handleWriteCycleFailure(Nio2Session[local=/192.168.180.70:38957, remote=/192.168.10.31:36228])
failed (IOException) to write 32768 bytes: Broken pipe
> 2018-01-23 10:30:10,017 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-3       ] [Window.waitForSpace]
waitForSpace(Window[server/remote](TcpipServerChannel[id=662, recipient=11]-ServerSessionImpl[circessh@/192.168.190.2:14840]))
available: 1146880
> 2018-01-23 10:30:10,017 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-2       ] [TcpipServerChannel.handleWriteDataFailure]
handleWriteDataFailure(TcpipServerChannel[id=662, recipient=11]-ServerSessionImpl[circessh@/192.168.190.2:14840])[SSH_MSG_CHANNEL_DATA]
failed (IOException) to write len=32768: Broken pipe
> 2018-01-23 10:30:10,018 WARN  [sshd-SshServer[1786f9d5]-nio2-thread-2       ]
[AbstractSession.exceptionCaught] exceptionCaught(ServerSessionImpl[circessh@/192.168.190.2:14840])[state=Opened]
IOException: Broken pipe
> 2018-01-23 10:30:10,018 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-3       ] [Window.waitAndConsume]
waitAndConsume(Window[server/remote](TcpipServerChannel[id=662, recipient=11]-ServerSessionImpl[circessh@/192.168.190.2:14840]))
- requested=32768, available=1146880
> 2018-01-23 10:30:10,018 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-2       ] [AbstractSession.exceptionCaught]
exceptionCaught(ServerSessionImpl[circessh@/192.168.190.2:14840])[state=Opened] details
> java.io.IOException: Broken pipe
>         at sun.nio.ch.FileDispatcherImpl.write0(Native Method)
>         at sun.nio.ch.SocketDispatcher.write(SocketDispatcher.java:47)
>         at sun.nio.ch.IOUtil.writeFromNativeBuffer(IOUtil.java:93)
>         at sun.nio.ch.IOUtil.write(IOUtil.java:65)
>         at sun.nio.ch.UnixAsynchronousSocketChannelImpl.finishWrite(UnixAsynchronousSocketChannelImpl.java:582)
>         at sun.nio.ch.UnixAsynchronousSocketChannelImpl.finish(UnixAsynchronousSocketChannelImpl.java:195)
>         at sun.nio.ch.UnixAsynchronousSocketChannelImpl.onEvent(UnixAsynchronousSocketChannelImpl.java:213)
>         at sun.nio.ch.EPollPort$EventHandlerTask.run(EPollPort.java:293)
>         at java.lang.Thread.run(Thread.java:745)
> 2018-01-23 10:30:10,023 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-1       ] [Nio2Session.writePacket]
writePacket(Nio2Session[local=/192.168.180.70:45470, remote=/192.168.10.31:22]) Writing 24780
bytes
> 2018-01-23 10:30:10,025 DEBUG [sshd-SshServer[1786f9d5]-nio2-thread-2       ] [SessionTimeoutListener.sessionException]
sessionException(ServerSessionImpl[circessh@/192.168.190.2:14840]) IOException: Broken pipe
> {quote}
>  



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