Roberto Deandrea created SSHD-851:
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Summary: Last chunk of data lost into local port forwarding channel
Key: SSHD-851
URL: https://issues.apache.org/jira/browse/SSHD-851
Project: MINA SSHD
Issue Type: Bug
Affects Versions: 2.1.1
Reporter: Roberto Deandrea
Attachments: sshd.agent.trace
Hi Lyor,
I found another problem transferring data through a local port forwarding
channel.
It seems that the problem is located into Apache SSHD server code according to
me.
All the data are transferred from the originating client to the Apache SSH
client and then go to the SSHD server through a local port forwarding channel.
When the client stops sending data, and the channel is being closed, the SSHD
server fail to send the last chunk of data to the target destination.
In the attached trace file the problem is isolated as the following:
*local port forwarding channel : [id=732 recipient=732]*
*Nio2Session[local=/0:0:0:0:0:0:0:0:50047, remote=/192.168.2.107:62284 session
against target server*
Looking through the traces I see that when the local port forwarding channel is
closed, the Nio2Session against the target server is closed gracefully, but
instead of waiting to complete pending socket writes to the target server the
Nio2Session is then closed immediately causing write failures.
In the traces I see:
2018-10-16 16:20:19,167 DEBUG [xdmzdriverssh@/192.168.10.34:55335]]-thread-1]
[AbstractCloseable.close] close(Nio2Session[local=/0:0:0:0:0:0:0:0:50047,
remote=/192.168.2.107:62284]) Closing gracefully
2018-10-16 16:20:19,167 DEBUG [xdmzdriverssh@/192.168.10.34:55335]]-thread-2]
[AbstractCloseable.close]
close(org.apache.sshd.common.io.nio2.Nio2Connector@77fcff14) Closing
immediately^M
2018-10-16 16:20:19,167 DEBUG [xdmzdriverssh@/192.168.10.34:55335]]-thread-2]
[AbstractCloseable.close] close(Nio2Session[local=/0:0:0:0:0:0:0:0:50047,
remote=/192.168.2.107:62284]) Closing immediately
After that I see:
2018-10-16 16:20:19,167 DEBUG [xdmzdriverssh@/192.168.10.34:55335]]-thread-2]
[Nio2Session.doCloseImmediately]
doCloseImmediately(Nio2Session[local=/0:0:0:0:0:0:0:0:50047,
remote=/192.168.2.107:62284]) signal write abort for
future=Nio2DefaultIoWriteFuture[id=/192.168.2.107:62284][value=null]
2018-10-16 16:20:19,167 DEBUG [xdmzdriverssh@/192.168.10.34:55335]]-thread-2]
[TcpipServerChannel.handleWriteDataFailure]
handleWriteDataFailure(TcpipServerChannel[id=732,
recipient=732]-ServerSessionImpl[aixdmzdriverssh@/192.168.10.34:55335])[SSH_MSG_CHANNEL_DATA]
failed (WriteAbortedException) to write len=16384: Write request aborted due
to immediate session close
These errors are repeated multiple times.
The sum of bytes not written are equal to the chunk of data missing ad the
target server.
Can you troubleshoot this problem?
Let me know if you need more info.
Cheers
Roberto
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