Oliver Stöneberg created SSHD-614:
-------------------------------------
Summary: 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
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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