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string), the wins_srv module now hands back a struct in_addr when it's
called. It caches the IP address once it has been looked up. The IP
is cleared (and must be looked up again) if the 'wins server' parameter
is reread, or if the node is marked 'dead'. A dead node will not be
re-tried for 10 minutes (per a #define in wins_srv.c).
As it was, the code was reading the WINS server name or IP directly from
lp_wins_server. That's okay, except that if the value was expressed as
a name, then a DNS lookup would be done every time the client wanted to
talk to the server.
I still need to work out the implications of failover regarding the
'unicast subnet' list.
Chris -)-----
*Note: failover doesn't actually work yet!* It's just that the code I'm
adding provides all of the pieces necessary.
I do have one big question. Something that I'll have to ask Jeremy, I'm
thinkin'. In nmbd/nmbd_subnetdb.c the IP of the WINS server is used to
set up the Unicast subnet.
...so what happens if the WINS server changes?
My guess is either:
a) nothing.
b) I'd have to change the unicast subnet entry whenever the WINS server
changes.
Urq.
BTW, the lp_wins_server() function no longer returns the WINS server name
or IP. It returns the list of WINS servers entered in smb.conf. To get
the currently 'live' WINS server, use the wins_srv() function.
Fun, eh?
Chris -)-----
new open mechanism Andrew & I discussed.
config.sub:
configure: Included the QNX patch.
include/vfs.h:
smbd/vfs-wrap.c:
smbd/vfs.c: Added ftruncate vfs call (needed).
Note that we will also need locking calls in the vfs (to be added).
lib/util_unistr.c:
nmbd/nmbd_processlogon.c: Fix for NT domain logons causing nmbd to core dump.
Also fix for sidsize DOS bug.
locking/locking.c: Check value of ret before using it for memdup.
printing/printing.c: Convert print_fsp_open to return an allocated fsp.
rpc_server/srv_lsa.c: Fix for NT domain logons.
I have removed all use of lp_share_modes() from the code (although I
left the parameter in the table for backwards compatibility). It no longer makes
sense for this to exist.
smbd/close.c: Removed lp_share_modes().
smbd/fileio.c: Fixed parameters to unlock_share_entry call in panic code.
smbd/files.c: Correctly set the unix_ERR_code to ERRnofids on fsp allocation fail.
smbd/nttrans.c:
smbd/reply.c:
smbd/trans2.c: Changed all occurrences of open_file_shared/open_directory/
open_file_stat to return an fsp from the call.
smbd/open.c: Changed all occurrences of open_file_shared/open_directory/
open_file_stat to return an fsp from the call.
In addition I have fixed a long standing race condition in the deny mode
processing w.r.t. two smbd's creating a file. Andrew, please note that
your original idea of using open with O_EXCL in this case would not work
(I went over the races very carefully) and so we must re-check deny modes
*after* the open() call returns. This is because there is a race between
the open with O_EXCL and the lock of the share mode entry. Imagine the
case where the first smbd does the open with O_EXCL and a deny mode of DENY_ALL,
but is pre-empted before it locks the share modes and creates the deny
mode entry for DENY_ALL. A second smbd could then come in with O_RDONLY
and a deny mode of DENY_NONE and the two opens would be allowed.
The *only* way to fix this race is to lock the share modes after the
open and then do the deny mode checks *after* this lock in the case
where the file did not originally exist.
This code will need extensive testing but seems to initially work.
Jeremy.
include/includes.h: Added SMB_BIG_UINT_BITS.
lib/util.c: Removed align2/align4 - use macros.
libsmb/namequery.c: Use ALIGN2.
locking/locking.c: Replace do_lock, do_unlock, args with SMB_BIG_UINT, not SMB_OFF_T.
Needed to move to hiding POSIX locks at a lower layer.
nmbd/nmbd_processlogon.c: Use ALIGN2/ALIGN4 macros.
smbd/blocking.c: Replace do_lock, do_unlock, args with SMB_BIG_UINT, not SMB_OFF_T.
smbd/reply.c: Replace do_lock, do_unlock, args with SMB_BIG_UINT, not SMB_OFF_T.
Jeremy.
assumption that we have one socket everywhere
while doing so I discovered a few bugs!
1) the clientgen session retarget code if used from smbd or nmbd would
cause a crash as it called close_sockets() which closed our main
socket! fixed by removing close_sockets() completely - it is unnecessary
2) the caching in client_addr() and client_name() was bogus - it could
easily get fooled and give the wrong result. fixed.
3) the retarget could could recurse, allowing an easy denial of
service attack on nmbd. fixed.
the previous definition could result is us overflowing a buffer. The
null termination was always added yet the size returned did not
include the null termination.
the new function takes a BOOL null_terminate, and always returns the
total number of bytes consumed by the string.
nmbd. It does NOT follow the rule that packets to the wins server have
rec_des set (I know that we have postulated this in the past). Please
don't screw with this unless you do careful testing from WinXX
clients.
Luke and I spent a couple of hours today getting this right (it was
wrong in both TNG and HEAD)
multihomed registration we were sending the packet to the wrong host!
We sent it to the person trying to register rather than to the person
who currently holds the name. That means we were not secure and we
could allow two people to register the same name.
Jeremy, you may wish to merge this change into 2.0.X
This fixes our netbios scope handling. We now have a 'netbios scope' option
in smb.conf and the scope option is removed from make_nmb_name()
this was prompted by a bug in our PDC finding code where it didn't append
the scope to the query of the '*' name.
I also fixed up the lookup_pdc_name() code so that it now works, even
with a NT server that insists on replying to udp/138.
The method I used to match packets was to use the mailslot string as a
datagram ID. The true dgm_id doesn't work as NT doesn't set it
correctly. uggh.
PS: Jeremy, I had to change your code quite a bit, are you sure this
worked with a Samba PDC?? The code looked broken, it got the offsets
wrong in the SMB portion of the packet and filled in the IP
incorrectly.
yamd is much better, and doesn't require any source code changes
if you haven't seen yamd then take a look at
http://www3.hmc.edu/~neldredge/yamd/
its excellent!
this means "nmblookup -S" now always works, even with broken servers
the database stores all unexpected replies and these can be accessed
by any client.
while doing this I cleaned up a couple of functions, and put in place
a better trn_id generator. in most places the code got quite a bit
simpler due to the addition of simple helper functions.
I haven't yet put the code in to take advantage of this for pdc
replies - that will be next. Jeremys pdc finding code will then work :)
- added TDB_CLEAR_IF_FIRST flag to clear the database if this is the
first attached process. Useful for non-persistent databases like our
locking area (this will also make upgrades to new database layouts easier)
- use lock_path() in a couple of places
- leave connections database open while smbd running
- cleaned up some tdb code a little, using macros for constants
they should all be replaced with cli_establish_connection().
created cli_use_wait_keyboard() which waits on multiple cli_states
and swallows session keepalives.
desired flag MUST be set in any NBT UDP packets sent to a WINS
server, else they will go to the WINS client side of the NT NetBIOS
kernel instead, and will get trashed.
- added \PIPE\browser server-side code.
request name.
modified createuser rpcclient command to examine name being added. if it
ends in a $, assume that a workstation trust account is being added.
reg_io_r_info() working properly. previously they weren't well
understood (well, they were the first of the registry functions i did,
back in december 97, ok??? :-)
set ntversion to 0x1 in SAMQUERY, so that we reply same as NT4 srv.
- disabled (AGAIN) the GETDC "if (MAILSLOT\NTLOGON)" code that will get
NT5rc2 to work but WILL break win95 (AGAIN). this needs _not_ to be
re-enabled but to be replaced with a better mechanism.
- added SMBwrite support (note: SMBwriteX already existed) as NT5rc2 is
sending DCE/RPC over SMBwrite not SMBwriteX.
password change requests), from Michael Stockman <pgmtekn@algonet.se>.
GETDC on \MAILSLOT\NET\NETLOGON necessarily returns less information
than the NTLOGON version.
