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https://issues.apache.org/jira/browse/SSHD-614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15057925#comment-15057925
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Oliver Stöneberg commented on SSHD-614:
---------------------------------------
No. This library is supposed to replace another SSH library which is used via
JNI at the moment and there's only SCP implemented at the moment so using SFTP
is not an option.
> 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[ssht...@xxxxxxxxx.xxxx.xxx/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[ssht...@xxxxxxxxx.xxxx.xxx/XX.XX.XX.XXX:22])
> recipient=0
> DEBUG [sshd-SshClient[51a8313b]-nio2-thread-9] (Window.java:122)
> init(ChannelExec[id=0,
> recipient=0]-ClientSessionImpl[ssht...@xxxxxxxxx.xxxx.xxx/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[ssht...@xxxxxxxxx.xxxx.xxx/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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