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Table Of Contents
|1.||23 Feb 2000 - 29 Feb 2000||(14 posts)||No Microsoft Conspiracy After All|
|2.||18 Feb 2000 - 1 Mar 2000||(17 posts)||Linux Using Domain Authentication|
|3.||26 Feb 2000 - 29 Feb 2000||(8 posts)||NT Usernames Not Being Mapped|
|4.||26 Feb 2000 - 3 Mar 2000||(14 posts)||HP and Samba|
|5.||28 Feb 2000 - 29 Feb 2000||(11 posts)||TNG File Locking Bug|
|6.||28 Feb 2000 - 2 Mar 2000||(17 posts)||TNG `become_root()' Bug|
|7.||28 Feb 2000 - 1 Mar 2000||(10 posts)||Duplication of Effort, and More Talk of Branch-Merging|
|8.||28 Feb 2000 - 1 Mar 2000||(7 posts)||Dead Processes|
|9.||29 Feb 2000 - 1 Mar 2000||(8 posts)||More Shared Library Woes|
At least one reader thought that our little editorial/explanation last week on Luke Leighton's release management abilities was a bit unfair, reading somewhat like a one-sided argument. That was certainly not the intent! It was supposed to have been more or less a retraction of our original remarks, and an acknowledgement that Luke has indeed proven his ability to settle down and adopt a release-cycle mindset. Anyway, this is what Luke actually wrote:
> Are we in feature freeze yet? :-)
well, we don't have complete features yet, so no, not really.
for example, connections are made (SMB) over which DCE/RPC function calls are sent, but either the client or the server can drop the connection.
now, do you want me to add a "feature" which allows connections to be automatically reestablished, or do you want me to freeze functionality now, with the consequences that your system may be unreliable?
ok, i'm being silly. i'm a little over-sensitive about the comments i saw on linuxcare's website saying i don't know how to work in a production environment (hi guys! saw your running commentary on the lists, i absolutely loved it, it's a scream. i am a little miffed about the code-freeze comments though).
Another correction: Hetz Ben Hamo sent in this note regarding last week's VMware update: "The VMWare fix credit is actually mine. I took this straight up their highest management, and after few emails exchanges, they recognized the problem, applogized and fixed it." Well done!
Mailing List Stats For This Week
We looked at 457 posts in 954K.
There were 210 different contributors. 70 posted more than once. 42 posted last week too.
The top posters of the week were:
1. No Microsoft Conspiracy After All
23 Feb 2000 - 29 Feb 2000 (14 posts) Archive Link: "Windows 2000 breaks the samba client"
People: Tom Zerucha, Jeremy Allison,
Jason Perlow reported on
samba (reposted from the
samba-bugs) that Linux
smbfs does not
work with Windows 2000. (
smbmount, which is part of the
smbfs, is distributed in the Samba source
code tarball, but is not considered part of Samba.)
Subsequent posts revealed that the problem was in browsing shares,
meaning that it is in
smbclient (which is part of
Samba) rather than in
Tom Zerucha had already reported this bug twice, going back to last December. He sounded a touch impatient:
They've must of known about it for a long time, but no one who appears to develop for samba has even acknowledged any of the messages or asked for more information or simply said we don't give a rat's rear about W2K compatability, which would be more courteous.
It is at least partially W2Ks problem - I used TCPdump and apparently they are negotiating a very old variant of the SMB protocol, so tcpdump can't decode the packets. Or they may have added something too new. In any case W2K isn't handshaking with smbclient the way it does with NT or 98.
This is suspicious because Microsoft had to know that samba was out there when it created the W2K stack, so probably intentionally mutated it in some way to make it not work right. But they did the same with windows when DRDOS threatened them.
Jeremy Allison explained, "Yes we do care. I'm working on it for 2.0.7. More when I know more. It does appear to be broken for 2.0.6, but then again 2.0.6 shipped way before Win2k, so I'm not accepting responsibility :-)." As to the Microsoft conspiracy theory, he said, "Nah - never assign to malice what can be adaquately explained by incompetence :-)."
Not long after, he got a lead. "I'm going to work on fixing the smbclient thing today. I got a message from someone at Corel that helps in tracking down the problem (I love this Open Source stuff :-) :-)."
The e-mail timestamps are hard to believe, but ninety seconds later Jeremy was back:
Ok I've fixed it. Turns out it was a weird little bug in Win2k... well, maybe :-).
It seems that the RAP functions in Win2k can't cope with a max buffer reply size of 64K (0xFFFF) - it returns "No server memory" instead of the requested reply. So I fixed the problem by dropping the buffer size reply from 0xFFFF to 0xFFE0 in the Samba client code - an empirical number determined by trial and error (as are so many things in Microsoft's protocol :-).
The old buffer value of 0xFFFF works correctly with all previous versions of Windows (and should be the correct value to use, as you really do want to have the maximum permitted share list size returned), but Win2K seems to be "different". Hmmmm :-).
He continued, "So, no malevolent Microsoft plots :-), just a plain old bug (sorry to dissapoint "X-Files" fans :-) :-). Whether this is a bug in Samba or in Win2k I'll leave the reader to decide...... (fade out with Twilight Zone music :-). What is clear is that Microsoft didn't regression test with the Samba client code (although I know they did with the server code)." He appended a short patch against 2.0.6 that he had already applied to the upcoming 2.0.7. [Debian Linux users: see also Debian Bug #59411.]
2. Linux Using Domain Authentication
18 Feb 2000 - 1 Mar 2000 (17 posts) Archive Link: "Linux as an NT CLIENT"
People: Jonathan Hutchins, Luke Leighton, Phil Mayers,
Jonathan Hutchins wanted to know about using Linux with NT domain
authentication. He posted to
"Since most of the documentation assumes that
the Samba box will be a server, it's not explicitly clear how one would
get a Samba/Linux CLIENT to join an NT domain and rely on NT
authentication for log-ins. Can this actually be done?"
Leighton was brief:
Phil Mayers wondered exactly what Jonathan meant. He noted that "being a client on an NT domain" could have various shades of meaning. "But you need to be clear exactly what you mean, and how you're making Linux an NT client. smbmount will allow you to mount smb shares, but there's a program with Samba called smbsh, which uses a shell wrapper DSO to intercept filesystem calls, and create the equivalent of a network neighbourhood. Again, I don't know the state of integration between smb-agent, pam_ntdom and smbsh. Luke?" Answer: "all untested."
Jonathan was still confused.
have no clue what "
pam_ntdom" is, or how I would "use" it.
It's not documented in anything I've found on samba yet. What is it?
Is it a compile-time option? Is it a keyword in recent versions of
smb.conf that's not documented?"
As for exactly
what he wanted out of the Linux box, he had thought it would be
"I want my Linux
workstation to use the NT PDC to authenticate users, so any user with a
domain account can log in to the Linux box, preferably without me
having to first create an account on the Linux box first."
Phil continued, about
"Yes, still need a passwd/NIS entry. IIRC there was something
under development called winbind, which is the equivalent for ypbind
for an NT domain, rather than NIS. Very nice. But it was dependent on
SURS, and hence probably TNG. Again, I don't know the
That got Luke started on an old favorite topic (see
#7, Section #1).
tim's working on it. actually, absolutely Everything is
dependent on a decent SURS implementation, and we don't have one. and
no, dammit, the current one isn't good enough. however, as i
was explaining to tim (it took a couple of days, and his code got a
lot simpler when he got it), it's not the responsibility of
pam_smbpass, or anything BUT surs
itself to solve the problem of mapping uids/gids and sids."
Phil, at this point, expressed the desire to code SURS lookups from an LDAP database. Luke replied, "luke howard has already written a sursldap, it's incredibly simple: it's a switch statement around two function calls. so it's been done."
3. NT Usernames Not Being Mapped
26 Feb 2000 - 29 Feb 2000 (8 posts) Archive Link: "amazing tng-0.6"
People: Vladimir Stavrinov, Luke Leighton, Pat LoPresti, Tim Nijenbrink,
Vladimir Stavrinov jubilantly (well, in jest anyway) reported a new bug in Samba-TNG, where his profiles were suddenly not being downloaded by the NT clients. He concluded, "What to do? Wait for tng-0.7?" Markus Stephany confirmed the problem. Luke replied, "gimme chance to try it out, meself. this one's quite tricky. we done a patch to "fake" this stuf as best as poss, it should actualy work fine."
Pat LoPresti tracked it down.
problem is that the "
nt_name" field is never being filled
in at all in the sam_passwd structure used by
getsamfile21pwent(). This structure is created by
sampassdb.c:pwdb_smb_to_sam(), which inherits the
nt_name value from the same field in the
smb_passwd structure returned by
smbpass.c:getsmbfilepwent(). Since "
is never explicitly assigned in any of these places, it is not
available for the
%U substitution, so the empty string
gets substituted instead."
He posted a patch which worked around
this by just using the Unix username in place of the missing NT
username -- not the correct fix, but it worked at his end.
Luke had had it with the function in question.
lib/domain_namemap.c, should be filling ALL the
nt_name, in correctly.
that's their xxxxing job!!! that's their sole, stupid, expensive task in life, and i'm fed up with that damn code. it's responsible for order-n-cubed traversion of user lists, recursive black holes and infinite loops.
i hate it.
and i don't really yet have a good enough handle on what to do to be confident about replacing it.
Tim Nijenbrink, meanwhile, came up with a very clever workaround, using
a Windows NT environment variable to get the username:
"I have been experiencing this problem to, and I substituted
the NT username string
seems to work for me."
4. HP and Samba
26 Feb 2000 - 3 Mar 2000 (14 posts) Archive Link: "HP supporting samba"
People: Francesc Guasch, Ulairi, Roberto Mello, Jeremy Allison, Dave Collier-Brown, John Holmes, Peter Bye,
Francesc Guasch had a question for the
"In the web it states HP does support samba
and there is a link. Following this link I read nothing about samba,
it may be wrong."
Ulairi had some experience with HP, it seems:
"HP, in their own inimitable way, will release the
product as "CIFS/9000". More then likely, it will be a replacement (or
a more advanced version) of their ASU/9000 LanMan product (Advanced
Server for Unix). Having had to play with ASU/9000 and HP's all-time
favorite game of "oh, you need a patch, but for that patch, you need
these reboot-the-system-after-install patches, too. Oh, and if the
system breaks after those patches, well, then you shouldn't have
installed them", I'd not touch CIFS for a while. Get the LanMan
product, it's stable and fairly nice."
Others also confirmed
that CIFS/9000 was indeed HP's version of Samba.
This prompted Roberto Mello to say: "I wish HP would more widely recognize that their "CIFS/9000" product is based on free software, Samba. I could only find the word "Samba" mentioned twice and in the Q&A. Not once in the fancy description of all the "features" of "CIFS/9000"." Jeremy Allison agreed, but explained: "HP told me they have customers who are frightened of "free software", so their marketing dept. don't want to tell them :-). HP are working very actively on Samba however, and have already submitted changes back to the main tree and are a very welcome addition to the Samba community along with SGI, Veritas, and other vendors." Ken Hall asked if, because of the GNU GPL, HP was required to give credit to the authors and provide source code. Jeremy Allison answered, "No, no need to give credit, but source code must be provided. HP are complying completely with this (I checked)."
Dave Collier-Brown also replied to Ulairi: "I'll bet you have an H-P 800 series system (;-)) The 700 folks are civil and helpful: if you have the choice, run your services on 700s."
John Holmes put in, "For what it's worth, I downloaded the HP version of CIFS/9000 and have installed it on a couple of machines. The installation went very well and I haven't had any problems so far, there was no need to reboot the system. It's been up for about a week. I think it does require HP-UX 11.00."
Peter Bye posted a nice long rant about various things HP, basically calling them johnny-come-latelies to the free software bandwagon. "In regard to HP supporting SAMBA, they seem to be going full bore on it as they are losing their customer base at a frightening rate. Unfortunately, HP is one of those companies that has most of their customers by the short hairs and treats them that way. It was not more than a year ago and HP was blaming all of our Server and Network problems on SAMBA, then it was SGI, then it was NT. The most incredible statment made by one of their Sr. Technical people on site was the HP's don't work well in "Mixed" Environments because they are the only one's that have a compliant O/S and software packages, NFS, AS/U, etc. As in SGI and SUN's NFS PV3 won't work with HP's NFS PV2 becuse it is non compliant. How about "Outdated" and a bad port to begin with." [...] "After all, they have a less experience than most of us when it comes to Samba would be my guess, although they claim to be up to snuff and have "Been on board all along", again, LOL. We'll see." [Much of this section may seem unfair to HP -- comments/rebuttals from HP are welcome.]
5. TNG File Locking Bug
28 Feb 2000 - 29 Feb 2000 (11 posts) Archive Link: "anybody else having trouble with tng cvs, configure, and locking?"
People: Greg Leblanc, Lars Kneschke,
Lots of people had questions about this one. Greg Leblanc got "first post" status:
I did a checkout of samba tng this morning, and when I run configure --prefix=/opt/samba, it zips (well, ponders) through a zillion checks, but pukes on the check for locking. To be more specific
'checking configure summary
ERROR: No locking available. Running Samba would be unsafe
configure: error: summary failure. Aborting config'
Seems to me that I'm probably broken, but how?
Several people posted nearly identical reports.
Lars Kneschke got on it right away.
"currently i checkout old samba tng versions, to see where the error
was first seen. It was between 25. and 27 february. I think i'll found
the bug soon."
Sure enough, he soon found a bug in the
ac_try is "
$CPP $CPPFLAGS conftest.c >/dev/null
is empty ..."
6. TNG `become_root()' Bug
28 Feb 2000 - 2 Mar 2000 (17 posts) Archive Link: "TNG 0.7 - can't join domain"
People: Luke Leighton, Michael Breuer, Tim Cole, Sander Striker, , Pat LoPresti
Michael Breuer had the not uncommon complaint that he was having
some trouble with Samba-TNG. He posted to
giving some sparse details on his unsuccessful attempt to join an NT
workstation to a Samba-controlled domain.
Luke Leighton was a little frustrated about the lack of detail in the report.
please, people, be more specific. time and time and time and time again, i have to repeat and repeat and repeat this: if your report doesn't contain specific instructions and information, it's completely useless.
"i can't join the domain".
well, which domain?
how does it not join?
how are you attempting to join?
did you type the username / password in the network control panel dialog?
did you know that you should do this?
does the trust account already exist?
does the unix account (
are you using ldap, smbpasswd or samtdb or mysql or nt5ldap as the password back-end?
these are just a few of the issues i can think of when someone says, "i can't join the domain", and i'm really sorry, michael, it's nothing personal, but it's really exasperating to be repeating this quite so many times [a day]. after three years, i'd have thought people would get it by now.
never mind, please don't take this personally: i'm a little bit... hmmm... stressed isn't quite the word. transitional phase coming up, reduced tolerance levels.
(The "transitional phase" turned out, we learn from a separate post, to be a move and a job change; Luke ended up off the net for the better part of a week. This singular fact greatly affected list traffic patterns and CVS commit rates....)
A very contrite Michael duly posted the details of his setup:
Windows 2000 trying to join, using the "create machine account" dialog
from the client, etc. Luke replied,
"hmm.... ok, 'cos i'm doing exactly that, and it works. hmm:
can you take a look in the logs, at level 100, for "
C000" or maybe "
status:c0000"? this last error
code will say what's failing. then let me know what you think it might
be, from the info proceeding the error-status-code."
found the error code:
status : c0000017 (both smb and netlogon). The smb log also
contains ERROR: unbecome root depth is 0 (from
That was enough to go on. Luke replied:
"damn, damn - ok, i bet the two are related. ok.
unbecome_root() - really does unbecome root
samr_drect_query_userinfo() - fails because it's not root
unbecome_root() - fails because we're already non-root.
dammit. i'm not certain as to how to eliminate this, because according to some people we should only be running as root, which is a security risk if we do it at the moment because there is no checking otheerwise on file access inside the msrpc code. i could "fix" this by doing an increment on
become_root() instead of
root_depth = 1 do
Tim Cole warned:
"You'll have to be
real careful doing that, though -- it's entirely possible that
some code, somewhere, expects that it can always safely do non-rooty
things after it's called
unbecome_root()... if that's been
getting called from code that itself becomes root..."
Sander Striker suggested:
"I guess people
are suggesting running as root and when doing file access checking
become_user(); check_access(file); unbecome_user();
To which Tim replied,
For his part, Pat LoPresti suggested a pair
of macros to wrap the
become_root() calls in, such that
forgetting to pair them properly would yield an obvious compile-time
7. Duplication of Effort, and More Talk of Branch-Merging
28 Feb 2000 - 1 Mar 2000 (10 posts) Archive Link: "Win2K problem looking up SIDs to names."
People: Jeremy Allison, Luke Leighton, Phil Mayers,
Jeremy Allison came across a new MS RPC call that he didn't know
about, and asked
samba-technical if anyone else knew
"I'm doing a security -> view on
Win2k and its giving me a
open"\lsarpc" pipe call,
followed by an
OPEN_POLICY2, followed by this rpc call
(which we don't decode). BTW: I checked in TNG and we don't decode it
He posted a structure dump of the unknown call.
"Any idea what this one is ? Without it
Win2k won't go onto do the lookup sids call. Under NT4.x, after the
OPEN_POLICY2 it goes straight into the
api_rpcTNP: api_ntlsa_rpc op 0xf - api_rpc_command: LSA_LOOKUPSIDS
call and all is well (correct unix names shown in dialog box)."
Luke, predictably, knew all about it:
the 0x39 lsarpc opcode you are supposed to return a fault pdu to -- just like nt 4.0 does.
as a result of returning the fault pdu, nt5 will carry on by using different msrpc functions.
if you were running tng you'd find that it worked fine.
see the cvs message i sent about bind nack and fault pdu (i added nack support to tng yesterday) i wrote some specific comments for you in it.
btw we HAVE to do this merge, it's not ok to be constantly rediscovering everything and duplicating / wasting effort on all these things. especially as this has been going on for far too long, already.
i count, from a quick recall, about four, maybe five, areas where you have spent time reinventing what i already have in tng, and sometimes (which is REALLY bad) adding things to cvs main or 2.0 but NOT adding them to tng.
this cannto continue for much longer
Jeremy agreed. "Actually, sniffing a Win2K to NT4.x was going to be my next step. But I thought you might already have addressed this, so thanks :-). This is why your tng branch is extremely valuable. It's just not production code (yet :-)." Elsewhere: "Luke, HEAD is slowly becoming TNG, it just takes a while as the code is moving across as it gets reviewed. This takes a lot of effort, don't get disheatened."
Phil Mayers wanted a clarification on that last bit: "Can we take it from that remark that code is currently being ported from the TNG to the HEAD branch?" Yes, said Jeremy:
Yes, I am actively filtching working code from tng and putting it into HEAD and 2.0.x :-).
However, the more radical stuff (the split daemon architecture) is exactly what I can't move over right now, as it is (as described) a radical change. I think it's the right thing to do long term as the code in tng looks very clean here, but it needs careful consideration before putting into production.
The split daemons will never go into 2.0.x, as I'm trying to make 2.0.x bugfix and patch updates only but may make it into HEAD (aka 3.0.x).
8. Dead Processes
28 Feb 2000 - 1 Mar 2000 (7 posts) Archive Link: "Multiple smbd processes generated"
People: Dave Collier-Brown, Frank Varnavas, Jeremy Allison, Andrew Boswell, , Bill Jojo, Using Samba
Andrew Boswell, running Tru64 Unix, was having occasional problems
with scores of defunct
smbd processes hanging around, none
of which could be killed. In extreme cases this was filling up the
process table, forcing a reboot of the Samba server. In less-extreme
cases, it was causing denial-of-service to whatever user it happened
to. The processes were idle -- not chewing up CPU time. Bill
Jojo claimed to have seen a similar manifestation on AIX 4.3.2, but it
had only happened twice, some time ago.
Dave Collier-Brown suggested:
quick avoidance: try setting
keepalive = 30
in the globals section of your
smb.conf. This will
trigger a check for a live connection after every 30 seconds of
inactivity. (For systems which aren't suffering from the problem you
have, something like every 10 minutes is perfectly sufficient)."
Frank Varnavas had a different theory:
"I've seen this happen when one or more NFS mounts hang. The processes
in question hang on the NFS access and cant be killed. The NT
redirector times the session out, closes the connection, and opens a
new one. This will happen every 45 seconds (the default redirector
timeout). Limiting your samba exports to local filesystems should
prevent this, as well as improve response time."
"If the process cannot be
killed with -9, then it isn't a Samba problem. Some kernel resource the
processes are waiting on is not responding (usually nfs). Are you
re-exporting NFS drives ?"
"There were NFS failures in
corresponding to the times on, some but not all, of the hung smbd
processes. We'll implement the "keepalives" parameter suggested by
David. NFS hopping is pretty crucial to our current Samba
architecture. Its one of the features which we really like about Samba
and usually works fine over our network. So we can't get rid of the
problem by only Samba serving local filestore."
Dave had an idea for eliminating NFS from the picture: "If you're using automounter and NIS to serve home directories via NFS, you can use a Samba option to auto-redirect the SMB connections to the actual fileserver with the home directories. This basically allows samba to say says "redirect your mount request to <server x>", where server x has the actual disks in question and is also running Samba." He gave a link to Chapter 6 of his book Using Samba. Also, he said, "I think one could fake a homedir map without using nis: It's a "mere matetr of programming" (;-)) Personally, I try to centralize home directories onto a fairly large server, and use the budgetary savings to fund RAIDing it and ordering some fast-repair options..."
9. More Shared Library Woes
29 Feb 2000 - 1 Mar 2000 (8 posts) Archive Link: "tng and shared libs"
People: Jean-François Micouleau, Peter Samuelson, Elrond,
Jean-François Micouleau was getting crashes in the Samba-TNG tools
if he tried to run them in-place rather than installing them into the
system hierarchy. He posed the following to
required to run
make install and use
/usr/local/samba/bin/rpcclient instead. why ? I want to
compile and run the binaries in the build directory."
I asked him, "What OS are you running? Sounds like a libtool bug. The shell scripts are supposed to work the way you tried." Elrond, the man behind the Samba-TNG libtool support, agreed, and added:
Could you send me the following things?
sh -x bin/rpcclient"
He also suggested
./configure.developer --disable-shared" to disable
building the shared libraries.
Other ideas flew about, mostly concerning out-of-date libraries in
the system paths, and
LD_LIBRARY_PATH. The care and
feeding of shared libraries really can get complex at times. Then
Elrond posted an update:
"This time it looks like it
wasn't libtool. It looks like an old version of bash (1.14) did have
some problems with those shell-scripts, upgrading bash seemed to have
Sharon And Joy
Kernel Traffic is grateful to be developed on a computer donated by Professor Greg Benson and Professor Allan Cruse in the Department of Computer Science at the University of San Francisco. This is the same department that invented FlashMob Computing. Kernel Traffic is hosted by the generous folks at kernel.org. All pages on this site are copyright their original authors, and distributed under the terms of the GNU General Public License version 2.0.