[jcifs] Re: FW: Connecting to DFS Roots

[Michael B Allen]

Daniel Palmer said:
> Hi Mike,
>
> I tried sending this to the list but it's apparently over the lists
> message size limit :)  Thought I'd send it to you directly and wait for
> the message sent to the list to be authorized.

That's ok. Generally you don't want to send packet captures to the list
anyway.

> -----Original Message-----
>
> This follows on a bit from "DFS listFiles() SmbException 0xC000000E"
> (http://lists.samba.org/archive/jcifs/2005-March/004796.html) but I'm
> just getting started with jCIFS and have been having similar issues
> using smbclient.
>
> My DFS root is \\trinity.local\TCS and the root target is
> \\shadrach\TCS-DFS-Root

>From looking at the captures there are a few things that are strange to me.

1) Explorer somehow has advance knowledge that \\trinity.local\TCS is a
DFS point and does a referreal right from the start. If jCIFS tries to
tree-connect to this share it just get's BAD_NETWORK_NAME.
2) \\shadrach\TCS-DFS-Root is reported to be a DFS point as well but if
JCIFS tries to get a referral you get the NO_SUCH_DEVICE (0xC000000E)
error.
3) Explorer seems to just use \\shadrach\TCS-DFS-Root using paths
\\trinity.local\TCS. If jCIFS tries to list \\shadrach\TCS-DFS-Root it get
PATH_NOT_COVERED.

There is obvoiusly a lot going on here I just don't understand. There's
some kind of nesting going on.

The only thing jCIFS supports doing is if it queries a path and get's
PATH_NOT_COVERED it will connect to IPC$, get a referral, and try again
with the new target. That's clearly not sufficient in your environment.

> I've attached the ethereal captures from this test session - and then
> emulated it using windows explorer.  (Connecting to \\trinity.local\TCS
> \\shadrach.trinity.local\TCS and \\shadrach.trinity.local\TCS-DFS-Root -
> all of which behaved normally in Explorer).  Apologies for the other
> junk in the capture - it's a live network and I didn't have the same
> issues on my test lan with smbclient - so I think jCIFS will prob work
> normally with it too.. :-S

So smbclient works? Can you get a capture of that? If the hosts in your
test environment are different please also get a capture of jcifs trying
the same exact thing as smbclient.

The first think I need to know is how the client discovers that the
addressed resource is a DFS point that requires a referral. Then I need to
figure out when the client should *not* ask for a referral even though the
tree is reported to be in DFS (e.g. \\shadrach\TCS-DFS-Root).

Perplexed,
Mike