SMB3 issues with smbclient

Paul Smedley paul at
Wed Dec 21 08:26:23 UTC 2016

Hi Again Metze!

On 21/12/16 07:10, Paul Smedley wrote:

>> What was the problem in your case? Did you send the value "1" over
>> the net?
> In this case, a particular application (MED editor) when saving a file
> on a SMB2+ share, creates a 0 byte file. Same application and plugin
> over SMB1 works fine.
> I'll comb back through the logs and potentially add some more logging
> and see what I can fine.
> I'll also test against a Win2k server, just to rule out the issue being
> with Samba Server.
OK some updates.

Issues happens with both Samba Server 4.4.5 & Win2k08.

I had a closer look at the logs. cli_ftruncate() is failing with SMB2+.

Part of the Netdrive (kinda like Fuse but for OS/2) api is a command to 
set the file size.

The implementation of this calls:
	if (!NT_STATUS_IS_OK(cli_ftruncate(cli, file->fd, newsize)))
file->fd is the fnum of the file handle, newsize is the size.

This works fine with SMB1. With SMB3, cli_errno(cli) returns an errno of 22.

Digging in more now....



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