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From <renatoferreirarenatoferre...@gmail.com>
Subject SSHD not clearly closing sessions
Date Sat, 23 Nov 2013 10:06:45 GMT
Hello, all!



I noted that, after receiving a given amount of data, the server session is not able to close
the connection properly.




A good connection with a small amount of data transferred looks like the following:





==> Call to onExit callback.

[pool-3-thread-1] DEBUG org.apache.sshd.server.channel.ChannelSession - Send SSH_MSG_CHANNEL_EOF
on channel 101

[pool-3-thread-1] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Writing 52 bytes

[pool-3-thread-1] DEBUG org.apache.sshd.server.channel.ChannelSession - Send SSH_MSG_CHANNEL_REQUEST
exit-status on channel 101

[pool-2-thread-2] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Read 36 bytes

[pool-3-thread-1] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Writing 68 bytes

[pool-2-thread-2] DEBUG org.apache.sshd.server.session.ServerSession - Received packet SSH_MSG_CHANNEL_EOF

[pool-2-thread-2] DEBUG org.apache.sshd.server.channel.ChannelSession - Received SSH_MSG_CHANNEL_EOF
on channel 101

[pool-3-thread-1] DEBUG org.apache.sshd.server.channel.ChannelSession - Closing channel 101
gracefully

[pool-3-thread-1] DEBUG org.apache.sshd.server.channel.ChannelSession - Wait 5s for shell
to exit cleanly

[pool-2-thread-3] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Read 36 bytes

[pool-2-thread-3] DEBUG org.apache.sshd.server.session.ServerSession - Received packet SSH_MSG_CHANNEL_CLOSE

[pool-2-thread-3] DEBUG org.apache.sshd.server.channel.ChannelSession - Received SSH_MSG_CHANNEL_CLOSE
on channel 101

==> Received the destroy() callback.

[pool-3-thread-1] DEBUG org.apache.sshd.server.channel.ChannelSession - Send SSH_MSG_CHANNEL_CLOSE
on channel 101

[pool-3-thread-1] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Writing 52 bytes

[pool-2-thread-5] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Socket has been disconnected,
closing IoSession now

[pool-2-thread-5] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Closing Nio2Session

[pool-2-thread-5] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Closing socket

[pool-2-thread-5] DEBUG org.apache.sshd.server.session.ServerSession - Closing session

[pool-2-thread-5] DEBUG org.apache.sshd.server.session.ServerSession - Closing IoSession

[pool-2-thread-5] DEBUG org.apache.sshd.server.session.ServerSession - IoSession closed

[pool-2-thread-5] INFO org.apache.sshd.server.session.ServerSession - Session 123@/0:0:0:0:0:0:0:1:62075
closed




And this is what happen to a connection that is not clearly closed:






==> Call to onExit callback.


[pool-3-thread-1] DEBUG org.apache.sshd.server.channel.ChannelSession - Send SSH_MSG_CHANNEL_EOF
on channel 101

[pool-3-thread-1] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Writing 52 bytes

[pool-3-thread-1] DEBUG org.apache.sshd.server.channel.ChannelSession - Send SSH_MSG_CHANNEL_REQUEST
exit-status on channel 101

[pool-2-thread-4] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Read 36 bytes

[pool-3-thread-1] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Writing 68 bytes

[pool-2-thread-4] DEBUG org.apache.sshd.server.session.ServerSession - Received packet SSH_MSG_CHANNEL_EOF

[pool-2-thread-4] DEBUG org.apache.sshd.server.channel.ChannelSession - Received SSH_MSG_CHANNEL_EOF
on channel 101

[pool-3-thread-1] DEBUG org.apache.sshd.server.channel.ChannelSession - Closing channel 101
gracefully

[pool-3-thread-1] DEBUG org.apache.sshd.server.channel.ChannelSession - Wait 5s for shell
to exit cleanly

[pool-3-thread-1] DEBUG org.apache.sshd.server.channel.ChannelSession - Send SSH_MSG_CHANNEL_CLOSE
on channel 101

[pool-3-thread-1] DEBUG org.apache.sshd.common.io.nio2.Nio2Session - Writing 52 bytes




In this second faulty example, the destroy method is never called and the connection only
closes with the 10 minutes (600000ms) threshold.




Is it a kind of bug or am I misusing the application? Note that I'm not running a shell application,
but in this place I'm creating a Lanterna (code.google.com/p/lanterna) based shell directly
by implementing Command interface and its factory. In order to confirm this behavior I tried
to run the default SSHD implementation (SshServer.main(String[] args)) and it's still getting
the same errors.




Does someone have any idea about how to get it working?





Thanks,




Renato A. Ferreira






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