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https://issues.apache.org/jira/browse/SSHD-614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15080360#comment-15080360
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Goldstein Lyor commented on SSHD-614:
-------------------------------------
Like I said, it works just fine for me so it seems like some kind of setup
problem on your part. You can turn on the logging at DEBUG level and see what
you can infer from it.
> SCP upload fails with dropbear server (aka server with paket size limitation)
> -----------------------------------------------------------------------------
>
> Key: SSHD-614
> URL: https://issues.apache.org/jira/browse/SSHD-614
> Project: MINA SSHD
> Issue Type: Bug
> Reporter: Oliver Stöneberg
> Priority: Minor
> Attachments: dropbear_not_working.log, openssh_working.log
>
>
> When trying to upload a file via SCP to a server running dropbear I get the
> following error:
> java.io.EOFException: readAck - EOF before ACK -
> at org.apache.sshd.common.scp.ScpHelper.readAck() in ScpHelper.java:703.
> at org.apache.sshd.common.scp.ScpHelper.sendStream() in ScpHelper.java:539.
> at org.apache.sshd.client.scp.DefaultScpClient.upload() in
> DefaultScpClient.java:104.
> at org.apache.sshd.client.scp.AbstractScpClient.upload() in
> AbstractScpClient.java:201.
> The main difference between dropbear and OpenSSH I have encountered is that
> dropbear has a paket size limitation in place by default. That's the reason
> in the first place why I even need to upload files via SCP since using trying
> to execute bigger scripts via an exec channel it will fail. I attached logs
> from the system that fails and another system. The main difference seems to
> be this:
> working (OpenSSH):
> DEBUG [sshd-SshClient[51a8313b]-nio2-thread-9]
> (AbstractConnectionService.java:236)
> channelOpenConfirmation(ChannelExec[id=0,
> recipient=-1]-ClientSessionImpl[[email protected]/XX.XX.XX.XXX:22])
> Received SSH_MSG_CHANNEL_OPEN_CONFIRMATION recipient=
> DEBUG [sshd-SshClient[51a8313b]-nio2-thread-9] (AbstractChannel.java:121)
> setRecipient(ChannelExec[id=0,
> recipient=-1]-ClientSessionImpl[[email protected]/XX.XX.XX.XXX:22])
> recipient=0
> DEBUG [sshd-SshClient[51a8313b]-nio2-thread-9] (Window.java:122)
> init(ChannelExec[id=0,
> recipient=0]-ClientSessionImpl[[email protected]/XX.XX.XX.XXX:22]:
> client remote window) size=0, max.=0, packet=32768
> DEBUG [sshd-SshClient[51a8313b]-nio2-thread-9] (ChannelExec.java:47)
> doOpen(ChannelExec[id=0,
> recipient=0]-ClientSessionImpl[[email protected]/XX.XX.XX.XXX:22])
> send SSH_MSG_CHANNEL_REQUEST exec command=scp -p -t -- /tmp/XXXXX_script.sh
> not working (dropbear):
> DEBUG [sshd-SshClient[11389053]-nio2-thread-7]
> (AbstractConnectionService.java:236)
> channelOpenConfirmation(ChannelExec[id=0,
> recipient=-1]-ClientSessionImpl[test@/XX.XX.XX.XXX:44]) Received
> SSH_MSG_CHANNEL_OPEN_CONFIRMATION recipient=
> DEBUG [sshd-SshClient[11389053]-nio2-thread-7] (AbstractChannel.java:121)
> setRecipient(ChannelExec[id=0,
> recipient=-1]-ClientSessionImpl[test@/XX.XX.XX.XXX:44]) recipient=0
> DEBUG [sshd-SshClient[11389053]-nio2-thread-7] (Window.java:122)
> init(ChannelExec[id=0, recipient=0]-ClientSessionImpl[test@/XX.XX.XX.XXX:44]:
> client remote window) size=24576, max.=24576, packet=32759
> DEBUG [sshd-SshClient[11389053]-nio2-thread-7] (ChannelExec.java:47)
> doOpen(ChannelExec[id=0,
> recipient=0]-ClientSessionImpl[test@/XX.XX.XX.XXX:44]) send
> SSH_MSG_CHANNEL_REQUEST exec command=scp -p -t -- /tmp/XXXXX_script.sh
> As you can see that's a min/max set for the not working dropbear.
> There's also two typos in this log message (the additional whitespace at
> "client local" and the period at "max":
> DEBUG [forceDeviceActionAsync] (Window.java:122) init(ChannelExec[id=0,
> recipient=-1]-ClientSessionImpl[test@/10.48.43.214:44]: client local window)
> size=2097152, max.=2097152, packet=32768
> I am using the latest version of master.
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