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https://issues.apache.org/jira/browse/SSHD-614?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15058058#comment-15058058
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Goldstein Lyor commented on SSHD-614:
-------------------------------------
I cannot reproduce your problem:
{quote}
$ dropbear -V
Dropbear v2015.71
$ ./dropbear -E -F -p 2222 -v -r ./dropbear_rsa_host_key -r
./dropbear_dss_host_key -r ./dropbear_ecdsa_host_key
{quote}
Get the latest version (including SSHD-615) and then you can debug in the IDE
the _ScpCommandMain_ test application (i.e., invoke its _main_) or look at
_ScpCommand#main_ and see how the code works. I have tried it with files
ranging from a few KB to ~220MB (see below) and everything succeeded - both
upload and download:
{quote}
Dec 15, 2015 2:46:15 PM
org.apache.sshd.common.util.SecurityUtils$BouncyCastleRegistration call
INFO: Trying to register BouncyCastle as a JCE provider
Dec 15, 2015 2:46:15 PM
org.apache.sshd.common.util.SecurityUtils$BouncyCastleRegistration call
INFO: Registration succeeded
Dec 15, 2015 2:46:16 PM
org.apache.sshd.client.keyverifier.StaticServerKeyVerifier handleAcceptance
WARNING: Server at /XXXX:2222 presented unverified EC key:
SHA256:dFKYViAe1WEsPbj6BlWctoKoyGPVOp6NDtFaYBkjd0U
startFileEvent\[SEND\] some-big-file length=218497024 \[OWNER_READ,
OWNER_WRITE, GROUP_READ, GROUP_WRITE, OTHERS_READ, OTHERS_WRITE\]
endFileEvent\[SEND\] some-big-file length=218497024 \[OWNER_READ,
OWNER_WRITE, GROUP_READ, GROUP_WRITE, OTHERS_READ, OTHERS_WRITE\]
{quote}
This is the upload example (since this what you tried), but I did the same for
download and it works...
> 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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