On Thu, May 23, 2019 at 06:24:16PM +0000, Tom Talpey via samba-technical wrote: > > -----Original Message----- > > From: Stefan Metzmacher <metze@xxxxxxxxx> > > Sent: Thursday, May 23, 2019 9:51 AM > > To: Tom Talpey <ttalpey@xxxxxxxxxxxxx>; Jeremy Allison <jra@xxxxxxxxx>; > > Steve French <smfrench@xxxxxxxxx> > > Cc: CIFS <linux-cifs@xxxxxxxxxxxxxxx>; samba-technical <samba- > > technical@xxxxxxxxxxxxxxx> > > Subject: Re: [PATCH][SMB3] Add missing defines for new negotiate contexts > > > > Hi Tom, > > > > >> The Windows protocol documents were updated on March 13 for the > > >> upcoming "19H1" update cycle. > > >> > > >> MS-SMB2 version page, with latest, diffs, etc: > > >> > > >> https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms- > > smb2/5606ad47-5ee0-437a-817e-70c366052962 > > > > > > So, there was a defect in the published spec which we just corrected, there's a > > new > > > update online at the above page. > > > > > > The value of the new compression contextid is actually "3", but the earlier > > document > > > incorrectly said "4". There were several other fixes and clarifications in the > > pipeline > > > which have also been included. > > > > > > Redline diffs as well as the usual standard publication formats are available. > > > > There's no server behavior defined for > > SMB2_NETNAME_NEGOTIATE_CONTEXT_ID. If there's none, why was it added > > at all? > > It's an advisory payload, and can be used to direct the connection appropriately > by load balancers, servers hosting multiple names, and the like. It's basically the > same servername that will be presented later in SMB2_TREE_CONNECT, only it's > available early, prior to any SMB3 processing. Other possible uses are for logging > and diagnosis. > > It has no actual function in the SMB3 protocol, so apart from defining the payload > it's not a matter for the MS-SMB2 document. We would hope, however, that clients > will include the context when sending SMB2_NEGOTIATE. IMHO Looks like a reinvention of the 'netbios name' field that allowed us to do clever things with the smb.conf 'netbios alias' parameter :-).
