Bug 8055 - Can't See Parts of DFS CIFS Share
Summary: Can't See Parts of DFS CIFS Share
Alias: None
Product: Samba 3.4
Classification: Unclassified
Component: libsmbclient (show other bugs)
Version: 3.4.6
Hardware: All All
: P5 normal
Target Milestone: ---
Assignee: Karolin Seeger
QA Contact: Samba QA Contact
Depends on:
Reported: 2011-04-02 14:27 UTC by Larry Reid
Modified: 2011-04-04 19:02 UTC (History)
0 users

See Also:

Patch (1.20 KB, patch)
2011-04-02 14:27 UTC, Larry Reid
jra: review+

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Description Larry Reid 2011-04-02 14:27:07 UTC
Created attachment 6367 [details]

When connecting to a DFS share using Nautilus on Ubuntu 10.04, I can only see part of the directory tree. Take the example of a share with a DFS root at X, and sub directories A, B, and C all on different servers. I can connect to X, and see A, B, and C, but directories A, B, and C are all shown as empty. If I directly connect to X/A, then I can see the files and directories in and below A.

Using smbclient directly from the command line gives the same behaviour.

The server is an EMC Celerra NAS NSG-8 with NAS version 5.6.50.

I traced the code. What I see is that in the function cli_dfs_get_referal in libsmb/clidfs.c two components of the path are returned: one that doesn't end in a \, and the other that doesn't start with a \. When the two paths are put together in the function cli_resolve_path (in the same source file), no \ is put between the components, which leads to smbclient not finding the directory. 

I made a patch on the v3-4-test branch of the Samba git repository. It seems to also patch the current stable 3.5.8 version. I've attached the patch. Note that I don't have the resources to test it against anything but the Celerra NAS.

I also installed 3.5.8, confirmed that the bug exists in 3.5.8, and that the patch works on 3.5.8.

Here's what I posted with the Ubuntu bug: 

Is it a regression ?
Did this use to work properly with a previous release ?

    Not as far as I know.

What version of samba packages are used ?
Please give the output of:

dpkg-query -W -f='${Package} ${Version} ${Source} ${Status}\n' | grep samba

libsmbclient 2:3.4.7~dfsg-1ubuntu3.5 samba install ok installed
libwbclient0 2:3.4.7~dfsg-1ubuntu3.5 samba install ok installed
samba-common 2:3.4.7~dfsg-1ubuntu3.5 samba install ok installed
samba-common-bin 2:3.4.7~dfsg-1ubuntu3.5 samba install ok installed
smbclient 2:3.4.7~dfsg-1ubuntu3.5 samba install ok installed
smbfs 2:3.4.7~dfsg-1ubuntu3.5 samba install ok installed
winbind 2:3.4.7~dfsg-1ubuntu3.5 samba install ok installed

How is the remote share accessed from the Ubuntu system?
nautilus (or other GUI client) YES
smbclient (from the command line) YES
cifs filesystem mount (from /etc/fstab or a mount command) YES
If nautilus (or another GUI client) is used to access the remote share, can the share be accessed with the smbclient command line utility ? NO

To test:

install the samba-client package
try to connect to the remote system from the command line:

smbclient //remote_system/share_name

    Connection works, but crossing to another server through DFS doesn't

If the share requires a specific username/password, try using the "-U" parameter (for example, use "-U ntdomain\\user").

smbclient doesn't work either. I have tried all combinations of ways to authenticate. With -d 10 I'm seeing messages that make me reasonably confident it's not an authentication problem (but it could be, I suppose).

If a cifs mount is used
In that case please also provide:

the content of the file /etc/fstab, or the command line used to mount the remote share if the share is manually mounted.

    sudo mount -t cifs --verbose -o user=my-domain/my-username //my-server/my-share /mnt

    mount works. Nautilus, gvfs-mount and smbclient don't.

the content of the file /proc/fs/cifs/DebugData

What is the remote server ?
In all cases, please include the output of the following smbclient command:

smbclient -L //remote_system
This should give us the remote server version. Also include on what kind of machine the share is located (Windows 2003 Server, Ubuntu 8.04, NAS box model...)

    It's an EMC Celerra NAS NSG-8 with NAS version 5.6.50

Here's the output of the smbclient -L command, edited to remove information that my organization wouldn't want me to share with the world:

Domain=[my-domain] OS=[EMC-SNAS:T5.6.50.2] Server=[my-server]

 Sharename Type Comment
 --------- ---- -------
 my-share Disk DFS01 root share
 C$ Disk Root Service
 IPC$ IPC IPC Service
Domain=[my-domain] OS=[EMC-SNAS:T5.6.50.2] Server=[my-server]

 Server Comment
 --------- -------

 Workgroup Master
 --------- -------
Comment 1 Volker Lendecke 2011-04-03 07:49:03 UTC
Comment on attachment 6367 [details]

Looks correct and safe to me.


Comment 2 Jeremy Allison 2011-04-04 00:30:21 UTC
Comment on attachment 6367 [details]

Looks good to me.
Comment 3 Jeremy Allison 2011-04-04 00:31:10 UTC
Re-assigning to Karolin for inclusion in 3.5.next.
Comment 4 Karolin Seeger 2011-04-04 19:02:02 UTC
Pushed to v3-5-test.
Will be included in the next release.
Closing out bug report.