ref: 3bd5ff9583c4b33aa27754fb4c3b6792261feb8a
dir: /sys/src/cmd/cifs/ChangeLog/
Mon Jan 16 12:36:20 GMT 2012 sorting out UNICODE setup during negoiation for cifsd. Seems we where relying on a bug in windows. reworked in such a way that we support both. revalidated against win7, xp, samba v3.2, and cifsd. Tue Sep 21 17:17:13 BST 2010 found the problem with cifs not connecting to Vista - there is a bug in windows, and a hotfix to sort it out. http://support.microsoft.com/kb/957441 also fixed a bug in UNICODE handling - I was controlling Unicode enable on the server's capabilities rather than on the actual decided flags. I got away with this on windows but cinap's cifsd bit me. also, I wasn not careful to ensure the negoiate protocol list was ALWAYS packed in ascii (it used to respect the Unicode flags which it should not. if the Virtual file was empty I could end up following a nil pointer, we now fail on open in this case (for simplicity). couple of error messages made a bit clearer. Wed Jul 15 15:06:48 BST 2009 learning more than I wanted to about how our windows server infrastructure works. It seems we have blades called se-blade-01 se-blade-02 etc and virtual servers called se-01 and se-02 etc. the blades provide a hot spare system where the two physical blades can switch places at any time. You normally connect to a server, e.g. se-01, this server will then contain dfs referals to other machines. Sadly these refereals are in terms of physical blades and not in terms of virtual servers, so you cannot strcmp() the connected host name with the referals. Just to add more confusion, the IP addresses are dynamically mapped too so I cannot resolve the IP addresses. The only way to tell if two names map to teh same host is to ingest the ARP table and lookup the IP addresses in that. That will show if the two IPS and thus the two hosts are the same. This works only if you are on the same physical network of course. (sigh) Wed Jul 15 14:38:37 BST 2009 Added case siginificance to cifs for most files this is easy, however for share names its hard as T2getallinfo() seems to return with the filename in lowercase for no good reason. There is also a problem that the redirected share name may not have the same name as the directory it reprisents, so a simple strcmp() is not good enough. Instead I assume that if the windows translated path is just "/" then its a share and in that case I don't check the filename is what was expected, as the share name translation is case significant and will have enforced the change. The DFS stuff is still a mess and needs a rewrite but the lack of documentation from MS is a real problem. I also tried to return an error specifying the remote path to DFS links that point to another host (not currently supported), this doesn't work and I cannot tell why - there is some odd code in /sys/src/lib9p/srv.h:/^cloneandwalk/ which ignores errors if they occur on anything after the first walk, however removing this still resulted in the debug from -D (9pchatty mode) showing the walk succeeding - very odd. It would be nice one day to rework the DFS code so it tries to use the current if it is on the list, however pings are rare and RTT times are cached and in some topologies there might be a different host that is actually closer, so long term it would be better to be unbiased about it. Fri Oct 24 13:37:51 BST 2008 Looked again at DFS, Microsoft have at last published the full protocol spec, so we have more of a chance of a proper client. Looking at my environment I now connect only to the root of the dfs tree, i.e. I no longer do an autoconnect to all the available shares, so the connect is faster (good). then I allow dfs to autoconnect on demand. I added some cacheing of ping RTTs so the autoconnect should be faster too. The cache doesn't fully work as expected as we only create cache entries on walk at present and not on any other operations. This means cloning an existing fid and using it will not cause a re-evaluation of the cache even if it has expired. I think I can design dfs under plan9 to run in a single program - perhaps cifs becomes cifssrv and I have multiple attaches as required. I could also have a ctrl file which gets requests for new instances. Of failing that the srv instances themselves could do the mount of new sessions. The only problem with this I see is that different hosts might need different command line options. It could get messy tryiong to emulate this with attach specificers. must look at MAC signing again too, how to do validate my work? Tue Mar 18 14:58:30 GMT 2008 made MID a variable rather than a constant, Windows servers restrict sessions to one per MID/user, thus a new session to a given server as user fred will kick off previous sessions. I thought this was useful and seemed to be what Microsoft intended. I have since found that in a complex DFS environment two IP addresses can point to the same server which supports the shares previously distributed across a pair of servers. When you try to connect to these two servers the seccond connection is then hung up by the windows server as it has the same MID. Mids are now made up on the fly. Mon Oct 30 11:03:36 GMT 2006 Tried to extract the password expiry date from cifs - definitely no RAP call to do it, MS say its held in LDAP (sigh), it might be possible with a RPC call... we are always one technology behind. Wed Oct 25 13:43:54 BST 2006 CVS is now quite happy - tested for several months Fixed a bug in the linked list handling of open files (damm!) if all the attaches of a cifs filesystem where closed and then a new attach was made cifs(1) would suicide. Fri Aug 11 11:52:05 BST 2006 Found another silly that caused CVS to get confused (I think this is the one, need to do some more testing, but it seems saner now). fsopen was referencing a perm member of the incomming 9p message which does not exist, and getting random numbers for permissions and creating readonly files somtimes. Thu Aug 10 10:34:14 BST 2006 Bug in pdatetime() / gdatetime() - logic wrong way up for working around a bug in Win95 - obvious as touch(1)ing a file would give silly 1907 dates. Not sure if I have broken win95 compatability but I no longer have any of them to test with. Tue Nov 8 11:02:48 GMT 2005 Fixed a howler that prevented files in dfs mounted areas from being renamed I now attempt to automount shares that are referenced by DFS links but which do not exist. This is a bodge nescessary as RAP ShareEnum drops shares with names > 12 chars long. If I ever implement RCP then this problem will go away. Still have some problem with cvs updates on dfs mounted dirs, CVS controlled files (CVS/Template) appears to become unexpectedly readonly. DFS implementation is a mess and should be a seperate program, it makes the outrageous assumption that all the DFS links appear on and point to a single machine (works for me, sorry). MAC signing still doesn't work and I still cannot see why. ------------------------------------------------------------ Tarted up dfsrootinfo - now works properly. 1/ I can find the domain controller (look up the domain name in dns, I.E. _ldap._tcp.pdc._msdcs.snellwilcox.local). 2/ I can find the domain name by doing a referral request for "" to the domain controller 3/ I can find the DFS root servers by using these replies in another referral request However I cannot find the name of the share at the root of DFS I could also find the closest server by doing a DNS lookup for _ldap._tcp.SITENAME._sites.dc._msdcs.snellwilcox.local where sitenameis the site. Unfortunately this site name seems to come only from LDAP On the positive side it looks like jsut a dns lookup of snellwilcox.local will return entries in increasing "distance from you" order - I.E. pick the first one. Wed Sep 28 14:49:40 BST 2005 Dfs almost works, needs to trim the requested name by the number of chars in 'used' Still reckon dfs should be a seperate program so I can do DFS lookups of "" and "domain" and do the binds of namespaces as they appear. looks like I can find the domain controller through DNS. Name mapping is starting to work but I have hit a problem. I am keeping the share pointer in the aux structure and this is wrong. I need to search the share table for the correct name when I resolve names I may also need to resolve a machine name table! Not sure if this is a good idea or not This would give a directory of machine names with shares under it and files under that. The alternative is to bind in seperate file servers on demand. /* FIXME: path+used - in T2getdfsreferral below is wrong - unicode means you cannot add pointers */ T2setfilelength(Session *s, Share *sp, int fh, FInfo *fip) /* FIXME: maybe broken, needs tested. */ Wed Sep 14 11:31:11 BST 2005 Proper support for deleting opened files added. Added a Filetable synthetic file as part of the debug - probably junk this soon but I have left it in as it might help with some other debugging. Still have problems with cvs which I don't understand: cvs [update aborted]: cannot write <CVS/Template file>: Permission denied Seems to be opening the file with 17 mode (truncate and write) causes the problem but its intermitant. Sept 8th cannot delet (or probably rename) open files. probably need to keep a seperate list of open file structures so all fids ont a file can be closed (and later reopened for rename()) by filename July 26 MAC signing still broken, only enabled with a compile option, see mkfile mschap moved out of factotum temporarly so we can try to get MAC signing to work. Openfile synthetic always seems to give permission denied DFS only just started, need more info on how it is really implemented. share enum disappointing - seems there really is no way to enumerate shares with names that are more than 13 (correct ?) chars long. July 6 2005 new auth structure in place NTLMv2 works fine. MAC signing should work but doesn't. The lm hash I generate for those protocols is rubbish. This means MAC signing will not work with LM auth. Currently cifs uses proto=pass rather than proto=mschap in an attempt to get MAC signing to work. I need the internal hashes to generate the MAC key used to sign packets and this is not exposed by factotum at present. I have got to get MAC signing to work first, longer term I will alter the struct comming back from factotum to add a MACkey field. need to update code to do multiple trans2 calls so I can get full user and node lists. rpc looks like its not too difficult after all - see workbench.c - this would allow more stats gathering and, more importantly SID to name mapping. maybe need to modify the rap calls so they malloc the structures required and make sure they are properly freed after use. dfs support is not really done yet, initial stab seems to work for /n/???/Dfsroot DFS startup attaches to the domain - how to find the very first CIFS server? DFS failure on walk(2) should result in a new attach, maybe via plumber or perhaps just forking another instance of cifs. ---------------------------------------------------------------- aquarela fails fixed server timestamp in negioate bodged support of GENERRIC_READ/WRITE/EXECUTE in smb_com_open added find_first+full_directory_info & find_next+full_directory_info added smb_com_write_andx allow set info to change attributes trans2_set_file_information Win95 set file length using CIFSwrite won't work as that uses writeandx and write and x of zero buyes doesn't truncate the file. need to test large read and writes (IE > MTU) which are enabled by CAP_LARGE_READ and CAP_LARGE_WRITE, unfortunately I don't have a win32 machine with >= 2GB free space. We connect with the same multiplex ID and source machine name so a given server will drop old connections when new ones are made. There is a TRANS2 to change the name of an open file but is it worth it - I cannot do anything else to an open file. DEC Pathworks servers may add trailing whitespace to filenames. We don't dare strip this at present as whitespace is a vaid filename character these days. maybe we should have a commandline option for this. Experience will tell. Known CIFS problems ~~~~~~~~~~~~~~~~~~~ NT adds a trailing zero as part of the filename in findfirst/findnext, This is not a problem for us as we treat filenames as zero terminated anyway. Core Setattr function doesn't appear to work under Windows NT4 It isn't possible to set datestamps on directories under Win95 It is necessary to seek to EOF to get stat() to report the correct size for files that are open.