Roberto Deandrea created SSHD-795:
-------------------------------------
Summary: 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
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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