2 Unix SMB/Netbios implementation.
4 file opening and share modes
5 Copyright (C) Andrew Tridgell 1992-1998
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 2 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program; if not, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 extern int DEBUGLEVEL;
26 extern pstring sesssetup_user;
27 extern uint16 global_oplock_port;
30 /****************************************************************************
31 fd support routines - attempt to do a dos_open
32 ****************************************************************************/
33 static int fd_attempt_open(char *fname, int flags, mode_t mode)
35 int fd = dos_open(fname,flags,mode);
37 /* Fix for files ending in '.' */
38 if((fd == -1) && (errno == ENOENT) &&
39 (strchr(fname,'.')==NULL))
42 fd = dos_open(fname,flags,mode);
45 #if (defined(ENAMETOOLONG) && defined(HAVE_PATHCONF))
46 if ((fd == -1) && (errno == ENAMETOOLONG))
49 char *p = strrchr(fname, '/');
51 if (p == fname) /* name is "/xxx" */
53 max_len = pathconf("/", _PC_NAME_MAX);
56 else if ((p == NULL) || (p == fname))
59 max_len = pathconf(".", _PC_NAME_MAX);
64 max_len = pathconf(fname, _PC_NAME_MAX);
68 if (strlen(p) > max_len)
70 char tmp = p[max_len];
73 if ((fd = dos_open(fname,flags,mode)) == -1)
81 /****************************************************************************
82 Cache a uid_t currently with this file open. This is an optimization only
83 used when multiple sessionsetup's have been done to one smbd.
84 ****************************************************************************/
85 void fd_add_to_uid_cache(file_fd_struct *fd_ptr, uid_t u)
87 if(fd_ptr->uid_cache_count >= sizeof(fd_ptr->uid_users_cache)/sizeof(uid_t))
89 fd_ptr->uid_users_cache[fd_ptr->uid_cache_count++] = u;
92 /****************************************************************************
93 Remove a uid_t that currently has this file open. This is an optimization only
94 used when multiple sessionsetup's have been done to one smbd.
95 ****************************************************************************/
96 static void fd_remove_from_uid_cache(file_fd_struct *fd_ptr, uid_t u)
99 for(i = 0; i < fd_ptr->uid_cache_count; i++)
100 if(fd_ptr->uid_users_cache[i] == u) {
101 if(i < (fd_ptr->uid_cache_count-1))
102 memmove((char *)&fd_ptr->uid_users_cache[i], (char *)&fd_ptr->uid_users_cache[i+1],
103 sizeof(uid_t)*(fd_ptr->uid_cache_count-1-i) );
104 fd_ptr->uid_cache_count--;
109 /****************************************************************************
110 Check if a uid_t that currently has this file open is present. This is an
111 optimization only used when multiple sessionsetup's have been done to one smbd.
112 ****************************************************************************/
113 static BOOL fd_is_in_uid_cache(file_fd_struct *fd_ptr, uid_t u)
116 for(i = 0; i < fd_ptr->uid_cache_count; i++)
117 if(fd_ptr->uid_users_cache[i] == u)
123 /****************************************************************************
124 fd support routines - attempt to re-open an already open fd as O_RDWR.
125 Save the already open fd (we cannot close due to POSIX file locking braindamage.
126 ****************************************************************************/
127 static void fd_attempt_reopen(char *fname, mode_t mode, file_fd_struct *fd_ptr)
129 int fd = dos_open( fname, O_RDWR, mode);
134 if(fd_ptr->real_open_flags == O_RDONLY)
135 fd_ptr->fd_readonly = fd_ptr->fd;
136 if(fd_ptr->real_open_flags == O_WRONLY)
137 fd_ptr->fd_writeonly = fd_ptr->fd;
140 fd_ptr->real_open_flags = O_RDWR;
143 /****************************************************************************
144 fd support routines - attempt to close the file referenced by this fd.
145 Decrements the ref_count and returns it.
146 ****************************************************************************/
147 uint16 fd_attempt_close(file_fd_struct *fd_ptr)
149 extern struct current_user current_user;
150 uint16 ret_ref = fd_ptr->ref_count;
152 DEBUG(3,("fd_attempt_close fd = %d, dev = %x, inode = %.0f, open_flags = %d, ref_count = %d.\n",
153 fd_ptr->fd, (unsigned int)fd_ptr->dev, (double)fd_ptr->inode,
154 fd_ptr->real_open_flags,
157 SMB_ASSERT(fd_ptr->ref_count != 0);
160 ret_ref = fd_ptr->ref_count;
162 if(fd_ptr->ref_count == 0) {
165 if(fd_ptr->fd_readonly != -1)
166 close(fd_ptr->fd_readonly);
167 if(fd_ptr->fd_writeonly != -1)
168 close(fd_ptr->fd_writeonly);
170 * Delete this fd_ptr.
174 fd_remove_from_uid_cache(fd_ptr, (uid_t)current_user.uid);
180 /****************************************************************************
181 fd support routines - check that current user has permissions
182 to open this file. Used when uid not found in optimization cache.
183 This is really ugly code, as due to POSIX locking braindamage we must
184 fork and then attempt to open the file, and return success or failure
186 ****************************************************************************/
187 static BOOL check_access_allowed_for_current_user( char *fname, int accmode )
191 if((child_pid = fork()) < 0) {
192 DEBUG(0,("check_access_allowed_for_current_user: fork failed.\n"));
202 if ((wpid = sys_waitpid(child_pid, &status_code, 0)) < 0) {
203 DEBUG(0,("check_access_allowed_for_current_user: The process is no longer waiting!\n"));
207 if (child_pid != wpid) {
208 DEBUG(0,("check_access_allowed_for_current_user: We were waiting for the wrong process ID\n"));
211 #if defined(WIFEXITED) && defined(WEXITSTATUS)
212 if (WIFEXITED(status_code) == 0) {
213 DEBUG(0,("check_access_allowed_for_current_user: The process exited while we were waiting\n"));
216 if (WEXITSTATUS(status_code) != 0) {
217 DEBUG(9,("check_access_allowed_for_current_user: The status of the process exiting was %d. Returning access denied.\n", status_code));
220 #else /* defined(WIFEXITED) && defined(WEXITSTATUS) */
221 if(status_code != 0) {
222 DEBUG(9,("check_access_allowed_for_current_user: The status of the process exiting was %d. Returning access denied.\n", status_code));
225 #endif /* defined(WIFEXITED) && defined(WEXITSTATUS) */
228 * Success - the child could open the file.
230 DEBUG(9,("check_access_allowed_for_current_user: The status of the process exiting was %d. Returning access allowed.\n", status_code));
237 DEBUG(9,("check_access_allowed_for_current_user: Child - attempting to open %s with mode %d.\n", fname, accmode ));
238 if((fd = fd_attempt_open( fname, accmode, 0)) < 0) {
243 DEBUG(9,("check_access_allowed_for_current_user: Child - returning ok.\n"));
250 /****************************************************************************
251 check a filename for the pipe string
252 ****************************************************************************/
253 static void check_for_pipe(char *fname)
255 /* special case of pipe opens */
259 if (strstr(s,"pipe/")) {
260 DEBUG(3,("Rejecting named pipe open for %s\n",fname));
261 unix_ERR_class = ERRSRV;
262 unix_ERR_code = ERRaccess;
266 /****************************************************************************
268 ****************************************************************************/
269 static void open_file(files_struct *fsp,connection_struct *conn,
270 char *fname1,int flags,mode_t mode, SMB_STRUCT_STAT *sbuf)
272 extern struct current_user current_user;
274 SMB_STRUCT_STAT statbuf;
275 file_fd_struct *fd_ptr;
276 int accmode = (flags & O_ACCMODE);
280 fsp->granted_oplock = False;
283 pstrcpy(fname,fname1);
285 /* check permissions */
288 * This code was changed after seeing a client open request
289 * containing the open mode of (DENY_WRITE/read-only) with
290 * the 'create if not exist' bit set. The previous code
291 * would fail to open the file read only on a read-only share
292 * as it was checking the flags parameter directly against O_RDONLY,
293 * this was failing as the flags parameter was set to O_RDONLY|O_CREAT.
297 if (conn->read_only && !conn->printer) {
298 /* It's a read-only share - fail if we wanted to write. */
299 if(accmode != O_RDONLY) {
300 DEBUG(3,("Permission denied opening %s\n",fname));
301 check_for_pipe(fname);
303 } else if(flags & O_CREAT) {
304 /* We don't want to write - but we must make sure that O_CREAT
305 doesn't create the file if we have write access into the
312 /* this handles a bug in Win95 - it doesn't say to create the file when it
319 if (flags == O_WRONLY)
320 DEBUG(3,("Bug in client? Set O_WRONLY without O_CREAT\n"));
324 * Ensure we have a valid struct stat so we can search the
328 if(dos_stat(fname, &statbuf) < 0) {
329 if(errno != ENOENT) {
330 DEBUG(3,("Error doing stat on file %s (%s)\n",
331 fname,strerror(errno)));
333 check_for_pipe(fname);
343 * Check to see if we have this file already
344 * open. If we do, just use the already open fd and increment the
345 * reference count (fd_get_already_open increments the ref_count).
347 if((fd_ptr = fd_get_already_open(sbuf))!= 0) {
349 * File was already open.
353 * Check it wasn't open for exclusive use.
355 if((flags & O_CREAT) && (flags & O_EXCL)) {
362 * Ensure that the user attempting to open
363 * this file has permissions to do so, if
364 * the user who originally opened the file wasn't
365 * the same as the current user.
368 if(!fd_is_in_uid_cache(fd_ptr, (uid_t)current_user.uid)) {
369 if(!check_access_allowed_for_current_user( fname, accmode )) {
370 /* Error - permission denied. */
371 DEBUG(3,("Permission denied opening file %s (flags=%d, accmode = %d)\n",
372 fname, flags, accmode));
373 /* Ensure the ref_count is decremented. */
375 fd_remove_from_uid_cache(fd_ptr, (uid_t)current_user.uid);
381 fd_add_to_uid_cache(fd_ptr, (uid_t)current_user.uid);
384 * If not opened O_RDWR try
385 * and do that here - a chmod may have been done
386 * between the last open and now.
388 if(fd_ptr->real_open_flags != O_RDWR)
389 fd_attempt_reopen(fname, mode, fd_ptr);
392 * Ensure that if we wanted write access
393 * it has been opened for write, and if we wanted read it
396 if(((accmode == O_WRONLY) && (fd_ptr->real_open_flags == O_RDONLY)) ||
397 ((accmode == O_RDONLY) && (fd_ptr->real_open_flags == O_WRONLY)) ||
398 ((accmode == O_RDWR) && (fd_ptr->real_open_flags != O_RDWR))) {
399 DEBUG(3,("Error opening (already open for flags=%d) file %s (%s) (flags=%d)\n",
400 fd_ptr->real_open_flags, fname,strerror(EACCES),flags));
401 check_for_pipe(fname);
402 fd_remove_from_uid_cache(fd_ptr, (uid_t)current_user.uid);
409 /* We need to allocate a new file_fd_struct (this increments the
411 if((fd_ptr = fd_get_new()) == 0)
414 * Whatever the requested flags, attempt read/write access,
415 * as we don't know what flags future file opens may require.
416 * If this fails, try again with the required flags.
417 * Even if we open read/write when only read access was
418 * requested the setting of the can_write flag in
419 * the file_struct will protect us from errant
420 * write requests. We never need to worry about O_APPEND
421 * as this is not set anywhere in Samba.
423 fd_ptr->real_open_flags = O_RDWR;
424 /* Set the flags as needed without the read/write modes. */
425 open_flags = flags & ~(O_RDWR|O_WRONLY|O_RDONLY);
426 fd_ptr->fd = fd_attempt_open(fname, open_flags|O_RDWR, mode);
428 * On some systems opening a file for R/W access on a read only
429 * filesystems sets errno to EROFS.
432 if((fd_ptr->fd == -1) && ((errno == EACCES) || (errno == EROFS))) {
434 if((fd_ptr->fd == -1) && (errno == EACCES)) {
436 if(accmode != O_RDWR) {
437 fd_ptr->fd = fd_attempt_open(fname, open_flags|accmode, mode);
438 fd_ptr->real_open_flags = accmode;
443 if ((fd_ptr->fd >=0) &&
444 conn->printer && lp_minprintspace(SNUM(conn))) {
446 SMB_BIG_UINT dum1,dum2,dum3;
448 pstrcpy(dname,fname);
449 p = strrchr(dname,'/');
451 if (sys_disk_free(dname,&dum1,&dum2,&dum3) < (SMB_BIG_UINT)lp_minprintspace(SNUM(conn))) {
452 if(fd_attempt_close(fd_ptr) == 0)
462 DEBUG(3,("Error opening file %s (%s) (flags=%d)\n",
463 fname,strerror(errno),flags));
464 /* Ensure the ref_count is decremented. */
465 fd_attempt_close(fd_ptr);
466 check_for_pipe(fname);
474 if(sys_fstat(fd_ptr->fd, &statbuf) == -1) {
475 /* Error - backout !! */
476 DEBUG(3,("Error doing fstat on fd %d, file %s (%s)\n",
477 fd_ptr->fd, fname,strerror(errno)));
478 /* Ensure the ref_count is decremented. */
479 fd_attempt_close(fd_ptr);
485 /* Set the correct entries in fd_ptr. */
486 fd_ptr->dev = sbuf->st_dev;
487 fd_ptr->inode = sbuf->st_ino;
489 fsp->fd_ptr = fd_ptr;
490 conn->num_files_open++;
491 fsp->mode = sbuf->st_mode;
492 GetTimeOfDay(&fsp->open_time);
493 fsp->vuid = current_user.vuid;
497 fsp->mmap_ptr = NULL;
499 fsp->can_lock = True;
500 fsp->can_read = ((flags & O_WRONLY)==0);
501 fsp->can_write = ((flags & (O_WRONLY|O_RDWR))!=0);
503 fsp->print_file = conn->printer;
504 fsp->modified = False;
505 fsp->granted_oplock = False;
506 fsp->sent_oplock_break = False;
507 fsp->is_directory = False;
508 fsp->delete_on_close = False;
511 * Note that the file name here is the *untranslated* name
512 * ie. it is still in the DOS codepage sent from the client.
513 * All use of this filename will pass though the sys_xxxx
514 * functions which will do the dos_to_unix translation before
515 * mapping into a UNIX filename. JRA.
517 string_set(&fsp->fsp_name,fname);
518 fsp->wbmpx_ptr = NULL;
521 * If the printer is marked as postscript output a leading
522 * file identifier to ensure the file is treated as a raw
524 * This has a similar effect as CtrlD=0 in WIN.INI file.
525 * tim@fsg.com 09/06/94
527 if (fsp->print_file && lp_postscript(SNUM(conn)) && fsp->can_write) {
528 DEBUG(3,("Writing postscript line\n"));
529 write_file(fsp,"%!\n",3);
532 DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
533 *sesssetup_user ? sesssetup_user : conn->user,fsp->fsp_name,
534 BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
535 conn->num_files_open));
540 /****************************************************************************
541 If it's a read-only file, and we were compiled with mmap enabled,
542 try and mmap the file. This is split out from open_file() above
543 as mmap'ing the file can cause the kernel reference count to
544 be incremented, which can cause kernel oplocks to be refused.
545 Splitting this call off allows the kernel oplock to be granted, then
547 ****************************************************************************/
549 static void mmap_open_file(files_struct *fsp)
552 /* mmap it if read-only */
553 if (!fsp->can_write) {
554 fsp->mmap_size = file_size(fsp->fsp_name);
555 if (fsp->mmap_size < MAX_MMAP_SIZE) {
556 fsp->mmap_ptr = (char *)mmap(NULL,fsp->mmap_size,
557 PROT_READ,MAP_SHARED,fsp->fd_ptr->fd,0);
559 if (fsp->mmap_ptr == (char *)-1 || !fsp->mmap_ptr) {
560 DEBUG(3,("Failed to mmap() %s - %s\n",
561 fsp->fsp_name,strerror(errno)));
562 fsp->mmap_ptr = NULL;
569 /****************************************************************************
571 Helper for open_file_shared.
572 Truncate a file after checking locking; close file if locked.
573 **************************************************************************/
574 static void truncate_unless_locked(files_struct *fsp, connection_struct *conn, int token,
578 SMB_OFF_T mask = ((SMB_OFF_T)0xC) << (SMB_OFF_T_BITS-4);
580 if (is_locked(fsp,conn,~mask,0,F_WRLCK)){
581 /* If share modes are in force for this connection we
582 have the share entry locked. Unlock it before closing. */
583 if (*share_locked && lp_share_modes(SNUM(conn)))
584 unlock_share_entry( conn, fsp->fd_ptr->dev,
585 fsp->fd_ptr->inode, token);
586 close_file(fsp,False);
587 /* Share mode no longer locked. */
588 *share_locked = False;
590 unix_ERR_class = ERRDOS;
591 unix_ERR_code = ERRlock;
593 sys_ftruncate(fsp->fd_ptr->fd,0);
599 enum {AFAIL,AREAD,AWRITE,AALL};
601 /*******************************************************************
602 reproduce the share mode access table
603 ********************************************************************/
604 static int access_table(int new_deny,int old_deny,int old_mode,
605 int share_pid,char *fname)
607 if (new_deny == DENY_ALL || old_deny == DENY_ALL) return(AFAIL);
609 if (new_deny == DENY_DOS || old_deny == DENY_DOS) {
611 if (old_deny == new_deny && share_pid == pid)
614 if (old_mode == 0) return(AREAD);
616 /* the new smbpub.zip spec says that if the file extension is
617 .com, .dll, .exe or .sym then allow the open. I will force
618 it to read-only as this seems sensible although the spec is
619 a little unclear on this. */
620 if ((fname = strrchr(fname,'.'))) {
621 if (strequal(fname,".com") ||
622 strequal(fname,".dll") ||
623 strequal(fname,".exe") ||
624 strequal(fname,".sym"))
634 if (old_deny==DENY_WRITE && old_mode==0) return(AREAD);
635 if (old_deny==DENY_READ && old_mode==0) return(AWRITE);
636 if (old_deny==DENY_NONE && old_mode==0) return(AALL);
639 if (old_deny==DENY_WRITE && old_mode==1) return(AREAD);
640 if (old_deny==DENY_READ && old_mode==1) return(AWRITE);
641 if (old_deny==DENY_NONE && old_mode==1) return(AALL);
644 if (old_deny==DENY_WRITE) return(AREAD);
645 if (old_deny==DENY_READ) return(AWRITE);
646 if (old_deny==DENY_NONE) return(AALL);
653 /****************************************************************************
654 check if we can open a file with a share mode
655 ****************************************************************************/
656 static int check_share_mode( share_mode_entry *share, int deny_mode,
658 BOOL fcbopen, int *flags)
660 int old_open_mode = share->share_mode &0xF;
661 int old_deny_mode = (share->share_mode >>4)&7;
663 if (old_deny_mode > 4 || old_open_mode > 2)
665 DEBUG(0,("Invalid share mode found (%d,%d,%d) on file %s\n",
666 deny_mode,old_deny_mode,old_open_mode,fname));
671 int access_allowed = access_table(deny_mode,old_deny_mode,old_open_mode,
674 if ((access_allowed == AFAIL) ||
675 (!fcbopen && (access_allowed == AREAD && *flags == O_RDWR)) ||
676 (access_allowed == AREAD && *flags == O_WRONLY) ||
677 (access_allowed == AWRITE && *flags == O_RDONLY))
679 DEBUG(2,("Share violation on file (%d,%d,%d,%d,%s,fcbopen = %d, flags = %d) = %d\n",
680 deny_mode,old_deny_mode,old_open_mode,
681 share->pid,fname, fcbopen, *flags, access_allowed));
685 if (access_allowed == AREAD)
688 if (access_allowed == AWRITE)
696 /****************************************************************************
697 open a file with a share mode
698 ****************************************************************************/
700 void open_file_shared(files_struct *fsp,connection_struct *conn,char *fname,int share_mode,int ofun,
701 mode_t mode,int oplock_request, int *Access,int *action)
705 int deny_mode = (share_mode>>4)&7;
706 SMB_STRUCT_STAT sbuf;
707 BOOL file_existed = file_exist(fname,&sbuf);
708 BOOL share_locked = False;
709 BOOL fcbopen = False;
713 int num_share_modes = 0;
718 DEBUG(10,("open_file_shared: fname = %s, share_mode = %x, ofun = %x, mode = %o, oplock request = %d\n",
719 fname, share_mode, ofun, mode, oplock_request ));
721 /* this is for OS/2 EAs - try and say we don't support them */
722 if (strstr(fname,".+,;=[]."))
724 unix_ERR_class = ERRDOS;
725 /* OS/2 Workplace shell fix may be main code stream in a later release. */
726 #if 1 /* OS2_WPS_FIX - Recent versions of OS/2 need this. */
727 unix_ERR_code = ERRcannotopen;
728 #else /* OS2_WPS_FIX */
729 unix_ERR_code = ERROR_EAS_NOT_SUPPORTED;
730 #endif /* OS2_WPS_FIX */
732 DEBUG(5,("open_file_shared: OS/2 EA's are not supported.\n"));
736 if ((ofun & 0x3) == 0 && file_existed)
738 DEBUG(5,("open_file_shared: create new requested for file %s and file already exists.\n",
746 if ((ofun & 0x3) == 2)
749 /* note that we ignore the append flag as
750 append does not mean the same thing under dos and unix */
752 switch (share_mode&0xF)
770 if (share_mode&(1<<14)) {
775 if (flags != O_RDONLY && file_existed &&
776 (!CAN_WRITE(conn) || IS_DOS_READONLY(dos_mode(conn,fname,&sbuf))))
780 DEBUG(5,("open_file_shared: read/write access requested for file %s on read only %s\n",
781 fname, !CAN_WRITE(conn) ? "share" : "file" ));
788 if (deny_mode > DENY_NONE && deny_mode!=DENY_FCB)
790 DEBUG(2,("Invalid deny mode %d on file %s\n",deny_mode,fname));
795 if (deny_mode == DENY_FCB) deny_mode = DENY_DOS;
797 if (lp_share_modes(SNUM(conn)))
800 share_mode_entry *old_shares = 0;
806 lock_share_entry(conn, dev, inode, &token);
808 num_share_modes = get_share_modes(conn, token, dev, inode, &old_shares);
812 * Check if the share modes will give us access.
815 if(share_locked && (num_share_modes != 0))
822 broke_oplock = False;
823 for(i = 0; i < num_share_modes; i++)
825 share_mode_entry *share_entry = &old_shares[i];
828 * By observation of NetBench, oplocks are broken *before* share
829 * modes are checked. This allows a file to be closed by the client
830 * if the share mode would deny access and the client has an oplock.
831 * Check if someone has an oplock on this file. If so we must break
832 * it before continuing.
834 if(share_entry->op_type & (EXCLUSIVE_OPLOCK|BATCH_OPLOCK))
837 DEBUG(5,("open_file_shared: breaking oplock (%x) on file %s, \
838 dev = %x, inode = %.0f\n", share_entry->op_type, fname, (unsigned int)dev, (double)inode));
840 /* Oplock break.... */
841 unlock_share_entry(conn, dev, inode, token);
842 if(request_oplock_break(share_entry, dev, inode) == False)
844 free((char *)old_shares);
846 DEBUG(0,("open_file_shared: FAILED when breaking oplock (%x) on file %s, \
847 dev = %x, inode = %.0f\n", old_shares[i].op_type, fname, (unsigned int)dev, (double)inode));
850 unix_ERR_class = ERRDOS;
851 unix_ERR_code = ERRbadshare;
854 lock_share_entry(conn, dev, inode, &token);
859 /* someone else has a share lock on it, check to see
861 if(check_share_mode(share_entry, deny_mode, fname, fcbopen, &flags) == False)
863 free((char *)old_shares);
864 unlock_share_entry(conn, dev, inode, token);
866 unix_ERR_class = ERRDOS;
867 unix_ERR_code = ERRbadshare;
875 free((char *)old_shares);
876 num_share_modes = get_share_modes(conn, token, dev, inode, &old_shares);
878 } while(broke_oplock);
882 free((char *)old_shares);
885 DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o\n",
886 flags,flags2,(int)mode));
888 open_file(fsp,conn,fname,flags|(flags2&~(O_TRUNC)),mode,file_existed ? &sbuf : 0);
889 if (!fsp->open && flags==O_RDWR && errno!=ENOENT && fcbopen)
892 open_file(fsp,conn,fname,flags,mode,file_existed ? &sbuf : 0 );
899 if((share_locked == False) && lp_share_modes(SNUM(conn)))
901 /* We created the file - thus we must now lock the share entry before creating it. */
902 dev = fsp->fd_ptr->dev;
903 inode = fsp->fd_ptr->inode;
904 lock_share_entry(conn, dev, inode, &token);
921 fsp->share_mode = (deny_mode<<4) | open_mode;
924 (*Access) = open_mode;
928 if (file_existed && !(flags2 & O_TRUNC)) *action = FILE_WAS_OPENED;
929 if (!file_existed) *action = FILE_WAS_CREATED;
930 if (file_existed && (flags2 & O_TRUNC)) *action = FILE_WAS_OVERWRITTEN;
932 /* We must create the share mode entry before truncate as
933 truncate can fail due to locking and have to close the
934 file (which expects the share_mode_entry to be there).
936 if (lp_share_modes(SNUM(conn)))
940 /* JRA. Currently this only services Exlcusive and batch
941 oplocks (no other opens on this file). This needs to
942 be extended to level II oplocks (multiple reader
945 if((oplock_request) && (num_share_modes == 0) && lp_oplocks(SNUM(conn)) &&
946 !IS_VETO_OPLOCK_PATH(conn,fname) && set_file_oplock(fsp) )
948 port = global_oplock_port;
956 set_share_mode(token, fsp, port, oplock_request);
959 if ((flags2&O_TRUNC) && file_existed)
960 truncate_unless_locked(fsp,conn,token,&share_locked);
963 * Attempt to mmap a read only file.
964 * Moved until after a kernel oplock may
965 * be granted due to reference count issues. JRA.
970 if (share_locked && lp_share_modes(SNUM(conn)))
971 unlock_share_entry( conn, dev, inode, token);
976 /****************************************************************************
977 Open a directory from an NT SMB call.
978 ****************************************************************************/
979 int open_directory(files_struct *fsp,connection_struct *conn,
980 char *fname, int smb_ofun, mode_t unixmode, int *action)
982 extern struct current_user current_user;
985 if (smb_ofun & 0x10) {
987 * Create the directory.
990 if(dos_mkdir(fname, unix_mode(conn,aDIR)) < 0) {
991 DEBUG(0,("open_directory: unable to create %s. Error was %s\n",
992 fname, strerror(errno) ));
996 *action = FILE_WAS_CREATED;
999 * Check that it *was* a directory.
1002 if(dos_stat(fname, &st) < 0) {
1003 DEBUG(0,("open_directory: unable to stat name = %s. Error was %s\n",
1004 fname, strerror(errno) ));
1008 if(!S_ISDIR(st.st_mode)) {
1009 DEBUG(0,("open_directory: %s is not a directory !\n", fname ));
1012 *action = FILE_WAS_OPENED;
1015 DEBUG(5,("open_directory: opening directory %s\n",
1019 * Setup the files_struct for it.
1023 conn->num_files_open++;
1025 GetTimeOfDay(&fsp->open_time);
1026 fsp->vuid = current_user.vuid;
1030 fsp->mmap_ptr = NULL;
1032 fsp->can_lock = True;
1033 fsp->can_read = False;
1034 fsp->can_write = False;
1035 fsp->share_mode = 0;
1036 fsp->print_file = False;
1037 fsp->modified = False;
1038 fsp->granted_oplock = False;
1039 fsp->sent_oplock_break = False;
1040 fsp->is_directory = True;
1043 * Note that the file name here is the *untranslated* name
1044 * ie. it is still in the DOS codepage sent from the client.
1045 * All use of this filename will pass though the sys_xxxx
1046 * functions which will do the dos_to_unix translation before
1047 * mapping into a UNIX filename. JRA.
1049 string_set(&fsp->fsp_name,fname);
1050 fsp->wbmpx_ptr = NULL;
1056 /*******************************************************************
1057 check if the share mode on a file allows it to be deleted or unlinked
1058 return True if sharing doesn't prevent the operation
1059 ********************************************************************/
1060 BOOL check_file_sharing(connection_struct *conn,char *fname, BOOL rename_op)
1064 share_mode_entry *old_shares = 0;
1065 int num_share_modes;
1066 SMB_STRUCT_STAT sbuf;
1072 if(!lp_share_modes(SNUM(conn)))
1075 if (dos_stat(fname,&sbuf) == -1) return(True);
1078 inode = sbuf.st_ino;
1080 lock_share_entry(conn, dev, inode, &token);
1081 num_share_modes = get_share_modes(conn, token, dev, inode, &old_shares);
1084 * Check if the share modes will give us access.
1087 if(num_share_modes != 0)
1094 broke_oplock = False;
1095 for(i = 0; i < num_share_modes; i++)
1097 share_mode_entry *share_entry = &old_shares[i];
1100 * Break oplocks before checking share modes. See comment in
1101 * open_file_shared for details.
1102 * Check if someone has an oplock on this file. If so we must
1103 * break it before continuing.
1105 if(share_entry->op_type & BATCH_OPLOCK)
1109 * It appears that the NT redirector may have a bug, in that
1110 * it tries to do an SMBmv on a file that it has open with a
1111 * batch oplock, and then fails to respond to the oplock break
1112 * request. This only seems to occur when the client is doing an
1113 * SMBmv to the smbd it is using - thus we try and detect this
1114 * condition by checking if the file being moved is open and oplocked by
1115 * this smbd process, and then not sending the oplock break in this
1116 * special case. If the file was open with a deny mode that
1117 * prevents the move the SMBmv will fail anyway with a share
1118 * violation error. JRA.
1120 if(rename_op && (share_entry->pid == pid))
1123 DEBUG(0,("check_file_sharing: NT redirector workaround - rename attempted on \
1124 batch oplocked file %s, dev = %x, inode = %.0f\n", fname, (unsigned int)dev, (double)inode));
1127 * This next line is a test that allows the deny-mode
1128 * processing to be skipped. This seems to be needed as
1129 * NT insists on the rename succeeding (in Office 9x no less !).
1130 * This should be removed as soon as (a) MS fix the redirector
1131 * bug or (b) NT SMB support in Samba makes NT not issue the
1132 * call (as is my fervent hope). JRA.
1139 DEBUG(5,("check_file_sharing: breaking oplock (%x) on file %s, \
1140 dev = %x, inode = %.0f\n", share_entry->op_type, fname, (unsigned int)dev, (double)inode));
1142 /* Oplock break.... */
1143 unlock_share_entry(conn, dev, inode, token);
1144 if(request_oplock_break(share_entry, dev, inode) == False)
1146 free((char *)old_shares);
1148 DEBUG(0,("check_file_sharing: FAILED when breaking oplock (%x) on file %s, \
1149 dev = %x, inode = %.0f\n", old_shares[i].op_type, fname, (unsigned int)dev, (double)inode));
1153 lock_share_entry(conn, dev, inode, &token);
1154 broke_oplock = True;
1159 /* someone else has a share lock on it, check to see
1161 if ((share_entry->share_mode != DENY_DOS) || (share_entry->pid != pid))
1168 free((char *)old_shares);
1169 num_share_modes = get_share_modes(conn, token, dev, inode, &old_shares);
1171 } while(broke_oplock);
1174 /* XXXX exactly what share mode combinations should be allowed for
1175 deleting/renaming? */
1176 /* If we got here then either there were no share modes or
1177 all share modes were DENY_DOS and the pid == getpid() */
1182 unlock_share_entry(conn, dev, inode, token);
1183 if(old_shares != NULL)
1184 free((char *)old_shares);