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;
510 * Note that the file name here is the *untranslated* name
511 * ie. it is still in the DOS codepage sent from the client.
512 * All use of this filename will pass though the sys_xxxx
513 * functions which will do the dos_to_unix translation before
514 * mapping into a UNIX filename. JRA.
516 string_set(&fsp->fsp_name,fname);
517 fsp->wbmpx_ptr = NULL;
520 * If the printer is marked as postscript output a leading
521 * file identifier to ensure the file is treated as a raw
523 * This has a similar effect as CtrlD=0 in WIN.INI file.
524 * tim@fsg.com 09/06/94
526 if (fsp->print_file && lp_postscript(SNUM(conn)) && fsp->can_write) {
527 DEBUG(3,("Writing postscript line\n"));
528 write_file(fsp,"%!\n",3);
531 DEBUG(2,("%s opened file %s read=%s write=%s (numopen=%d)\n",
532 *sesssetup_user ? sesssetup_user : conn->user,fsp->fsp_name,
533 BOOLSTR(fsp->can_read), BOOLSTR(fsp->can_write),
534 conn->num_files_open));
539 /****************************************************************************
540 If it's a read-only file, and we were compiled with mmap enabled,
541 try and mmap the file. This is split out from open_file() above
542 as mmap'ing the file can cause the kernel reference count to
543 be incremented, which can cause kernel oplocks to be refused.
544 Splitting this call off allows the kernel oplock to be granted, then
546 ****************************************************************************/
548 static void mmap_open_file(files_struct *fsp)
551 /* mmap it if read-only */
552 if (!fsp->can_write) {
553 fsp->mmap_size = file_size(fsp->fsp_name);
554 if (fsp->mmap_size < MAX_MMAP_SIZE) {
555 fsp->mmap_ptr = (char *)mmap(NULL,fsp->mmap_size,
556 PROT_READ,MAP_SHARED,fsp->fd_ptr->fd,0);
558 if (fsp->mmap_ptr == (char *)-1 || !fsp->mmap_ptr) {
559 DEBUG(3,("Failed to mmap() %s - %s\n",
560 fsp->fsp_name,strerror(errno)));
561 fsp->mmap_ptr = NULL;
568 /****************************************************************************
570 Helper for open_file_shared.
571 Truncate a file after checking locking; close file if locked.
572 **************************************************************************/
573 static void truncate_unless_locked(files_struct *fsp, connection_struct *conn, int token,
577 SMB_OFF_T mask = ((SMB_OFF_T)0xC) << (SMB_OFF_T_BITS-4);
579 if (is_locked(fsp,conn,~mask,0,F_WRLCK)){
580 /* If share modes are in force for this connection we
581 have the share entry locked. Unlock it before closing. */
582 if (*share_locked && lp_share_modes(SNUM(conn)))
583 unlock_share_entry( conn, fsp->fd_ptr->dev,
584 fsp->fd_ptr->inode, token);
585 close_file(fsp,False);
586 /* Share mode no longer locked. */
587 *share_locked = False;
589 unix_ERR_class = ERRDOS;
590 unix_ERR_code = ERRlock;
592 sys_ftruncate(fsp->fd_ptr->fd,0);
598 enum {AFAIL,AREAD,AWRITE,AALL};
600 /*******************************************************************
601 reproduce the share mode access table
602 ********************************************************************/
603 static int access_table(int new_deny,int old_deny,int old_mode,
604 int share_pid,char *fname)
606 if (new_deny == DENY_ALL || old_deny == DENY_ALL) return(AFAIL);
608 if (new_deny == DENY_DOS || old_deny == DENY_DOS) {
610 if (old_deny == new_deny && share_pid == pid)
613 if (old_mode == 0) return(AREAD);
615 /* the new smbpub.zip spec says that if the file extension is
616 .com, .dll, .exe or .sym then allow the open. I will force
617 it to read-only as this seems sensible although the spec is
618 a little unclear on this. */
619 if ((fname = strrchr(fname,'.'))) {
620 if (strequal(fname,".com") ||
621 strequal(fname,".dll") ||
622 strequal(fname,".exe") ||
623 strequal(fname,".sym"))
633 if (old_deny==DENY_WRITE && old_mode==0) return(AREAD);
634 if (old_deny==DENY_READ && old_mode==0) return(AWRITE);
635 if (old_deny==DENY_NONE && old_mode==0) return(AALL);
638 if (old_deny==DENY_WRITE && old_mode==1) return(AREAD);
639 if (old_deny==DENY_READ && old_mode==1) return(AWRITE);
640 if (old_deny==DENY_NONE && old_mode==1) return(AALL);
643 if (old_deny==DENY_WRITE) return(AREAD);
644 if (old_deny==DENY_READ) return(AWRITE);
645 if (old_deny==DENY_NONE) return(AALL);
652 /****************************************************************************
653 check if we can open a file with a share mode
654 ****************************************************************************/
655 static int check_share_mode( share_mode_entry *share, int deny_mode,
657 BOOL fcbopen, int *flags)
659 int old_open_mode = GET_OPEN_MODE(share->share_mode);
660 int old_deny_mode = GET_DENY_MODE(share->share_mode);
662 if (old_deny_mode > 4 || old_open_mode > 2)
664 DEBUG(0,("Invalid share mode found (%d,%d,%d) on file %s\n",
665 deny_mode,old_deny_mode,old_open_mode,fname));
670 int access_allowed = access_table(deny_mode,old_deny_mode,old_open_mode,
673 if ((access_allowed == AFAIL) ||
674 (!fcbopen && (access_allowed == AREAD && *flags == O_RDWR)) ||
675 (access_allowed == AREAD && *flags == O_WRONLY) ||
676 (access_allowed == AWRITE && *flags == O_RDONLY))
678 DEBUG(2,("Share violation on file (%d,%d,%d,%d,%s,fcbopen = %d, flags = %d) = %d\n",
679 deny_mode,old_deny_mode,old_open_mode,
680 share->pid,fname, fcbopen, *flags, access_allowed));
684 if (access_allowed == AREAD)
687 if (access_allowed == AWRITE)
695 /****************************************************************************
696 open a file with a share mode
697 ****************************************************************************/
699 void open_file_shared(files_struct *fsp,connection_struct *conn,char *fname,int share_mode,int ofun,
700 mode_t mode,int oplock_request, int *Access,int *action)
704 int deny_mode = GET_DENY_MODE(share_mode);
705 BOOL allow_share_delete = GET_ALLOW_SHARE_DELETE(share_mode);
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 ((GET_FILE_OPEN_DISPOSITION(ofun) == FILE_EXISTS_FAIL) && file_existed)
738 DEBUG(5,("open_file_shared: create new requested for file %s and file already exists.\n",
744 if (GET_FILE_CREATE_DISPOSITION(ofun) == FILE_CREATE_IF_NOT_EXIST)
747 if (GET_FILE_OPEN_DISPOSITION(ofun) == FILE_EXISTS_TRUNCATE)
750 /* note that we ignore the append flag as
751 append does not mean the same thing under dos and unix */
753 switch (GET_OPEN_MODE(share_mode))
755 case DOS_OPEN_WRONLY:
771 if (GET_FILE_SYNC_OPENMODE(share_mode)) {
776 if (flags != O_RDONLY && file_existed &&
777 (!CAN_WRITE(conn) || IS_DOS_READONLY(dos_mode(conn,fname,&sbuf))))
781 DEBUG(5,("open_file_shared: read/write access requested for file %s on read only %s\n",
782 fname, !CAN_WRITE(conn) ? "share" : "file" ));
789 if (deny_mode > DENY_NONE && deny_mode!=DENY_FCB)
791 DEBUG(2,("Invalid deny mode %d on file %s\n",deny_mode,fname));
796 if (deny_mode == DENY_FCB)
797 deny_mode = DENY_DOS;
799 if (lp_share_modes(SNUM(conn)))
802 share_mode_entry *old_shares = 0;
808 lock_share_entry(conn, dev, inode, &token);
810 num_share_modes = get_share_modes(conn, token, dev, inode, &old_shares);
814 * Check if the share modes will give us access.
817 if(share_locked && (num_share_modes != 0))
824 broke_oplock = False;
825 for(i = 0; i < num_share_modes; i++)
827 share_mode_entry *share_entry = &old_shares[i];
830 * By observation of NetBench, oplocks are broken *before* share
831 * modes are checked. This allows a file to be closed by the client
832 * if the share mode would deny access and the client has an oplock.
833 * Check if someone has an oplock on this file. If so we must break
834 * it before continuing.
836 if(share_entry->op_type & (EXCLUSIVE_OPLOCK|BATCH_OPLOCK))
839 DEBUG(5,("open_file_shared: breaking oplock (%x) on file %s, \
840 dev = %x, inode = %.0f\n", share_entry->op_type, fname, (unsigned int)dev, (double)inode));
842 /* Oplock break.... */
843 unlock_share_entry(conn, dev, inode, token);
844 if(request_oplock_break(share_entry, dev, inode) == False)
846 free((char *)old_shares);
848 DEBUG(0,("open_file_shared: FAILED when breaking oplock (%x) on file %s, \
849 dev = %x, inode = %.0f\n", old_shares[i].op_type, fname, (unsigned int)dev, (double)inode));
852 unix_ERR_class = ERRDOS;
853 unix_ERR_code = ERRbadshare;
856 lock_share_entry(conn, dev, inode, &token);
861 /* someone else has a share lock on it, check to see
863 if(check_share_mode(share_entry, deny_mode, fname, fcbopen, &flags) == False)
865 free((char *)old_shares);
866 unlock_share_entry(conn, dev, inode, token);
868 unix_ERR_class = ERRDOS;
869 unix_ERR_code = ERRbadshare;
877 free((char *)old_shares);
878 num_share_modes = get_share_modes(conn, token, dev, inode, &old_shares);
880 } while(broke_oplock);
884 free((char *)old_shares);
887 DEBUG(4,("calling open_file with flags=0x%X flags2=0x%X mode=0%o\n",
888 flags,flags2,(int)mode));
890 open_file(fsp,conn,fname,flags|(flags2&~(O_TRUNC)),mode,file_existed ? &sbuf : 0);
891 if (!fsp->open && flags==O_RDWR && errno!=ENOENT && fcbopen)
894 open_file(fsp,conn,fname,flags,mode,file_existed ? &sbuf : 0 );
901 if((share_locked == False) && lp_share_modes(SNUM(conn)))
903 /* We created the file - thus we must now lock the share entry before creating it. */
904 dev = fsp->fd_ptr->dev;
905 inode = fsp->fd_ptr->inode;
906 lock_share_entry(conn, dev, inode, &token);
913 open_mode = DOS_OPEN_RDONLY;
916 open_mode = DOS_OPEN_RDWR;
919 open_mode = DOS_OPEN_WRONLY;
923 fsp->share_mode = SET_DENY_MODE(deny_mode) |
924 SET_OPEN_MODE(open_mode) |
925 SET_ALLOW_SHARE_DELETE(allow_share_delete);
928 (*Access) = open_mode;
932 if (file_existed && !(flags2 & O_TRUNC)) *action = FILE_WAS_OPENED;
933 if (!file_existed) *action = FILE_WAS_CREATED;
934 if (file_existed && (flags2 & O_TRUNC)) *action = FILE_WAS_OVERWRITTEN;
936 /* We must create the share mode entry before truncate as
937 truncate can fail due to locking and have to close the
938 file (which expects the share_mode_entry to be there).
940 if (lp_share_modes(SNUM(conn)))
944 /* JRA. Currently this only services Exlcusive and batch
945 oplocks (no other opens on this file). This needs to
946 be extended to level II oplocks (multiple reader
949 if((oplock_request) && (num_share_modes == 0) && lp_oplocks(SNUM(conn)) &&
950 !IS_VETO_OPLOCK_PATH(conn,fname) && set_file_oplock(fsp) )
952 port = global_oplock_port;
960 set_share_mode(token, fsp, port, oplock_request);
963 if ((flags2&O_TRUNC) && file_existed)
964 truncate_unless_locked(fsp,conn,token,&share_locked);
967 * Attempt to mmap a read only file.
968 * Moved until after a kernel oplock may
969 * be granted due to reference count issues. JRA.
974 if (share_locked && lp_share_modes(SNUM(conn)))
975 unlock_share_entry( conn, dev, inode, token);
978 /****************************************************************************
979 Open a directory from an NT SMB call.
980 ****************************************************************************/
982 int open_directory(files_struct *fsp,connection_struct *conn,
983 char *fname, int smb_ofun, mode_t unixmode, int *action)
985 extern struct current_user current_user;
988 if (smb_ofun & 0x10) {
990 * Create the directory.
993 if(dos_mkdir(fname, unix_mode(conn,aDIR)) < 0) {
994 DEBUG(0,("open_directory: unable to create %s. Error was %s\n",
995 fname, strerror(errno) ));
999 *action = FILE_WAS_CREATED;
1002 * Check that it *was* a directory.
1005 if(dos_stat(fname, &st) < 0) {
1006 DEBUG(0,("open_directory: unable to stat name = %s. Error was %s\n",
1007 fname, strerror(errno) ));
1011 if(!S_ISDIR(st.st_mode)) {
1012 DEBUG(0,("open_directory: %s is not a directory !\n", fname ));
1015 *action = FILE_WAS_OPENED;
1018 DEBUG(5,("open_directory: opening directory %s\n",
1022 * Setup the files_struct for it.
1026 conn->num_files_open++;
1028 GetTimeOfDay(&fsp->open_time);
1029 fsp->vuid = current_user.vuid;
1033 fsp->mmap_ptr = NULL;
1035 fsp->can_lock = True;
1036 fsp->can_read = False;
1037 fsp->can_write = False;
1038 fsp->share_mode = 0;
1039 fsp->print_file = False;
1040 fsp->modified = False;
1041 fsp->granted_oplock = False;
1042 fsp->sent_oplock_break = False;
1043 fsp->is_directory = True;
1046 * Note that the file name here is the *untranslated* name
1047 * ie. it is still in the DOS codepage sent from the client.
1048 * All use of this filename will pass though the sys_xxxx
1049 * functions which will do the dos_to_unix translation before
1050 * mapping into a UNIX filename. JRA.
1052 string_set(&fsp->fsp_name,fname);
1053 fsp->wbmpx_ptr = NULL;
1059 /*******************************************************************
1060 check if the share mode on a file allows it to be deleted or unlinked
1061 return True if sharing doesn't prevent the operation
1062 ********************************************************************/
1064 BOOL check_file_sharing(connection_struct *conn,char *fname, BOOL rename_op)
1068 share_mode_entry *old_shares = 0;
1069 int num_share_modes;
1070 SMB_STRUCT_STAT sbuf;
1076 if(!lp_share_modes(SNUM(conn)))
1079 if (dos_stat(fname,&sbuf) == -1) return(True);
1082 inode = sbuf.st_ino;
1084 lock_share_entry(conn, dev, inode, &token);
1085 num_share_modes = get_share_modes(conn, token, dev, inode, &old_shares);
1088 * Check if the share modes will give us access.
1091 if(num_share_modes != 0)
1098 broke_oplock = False;
1099 for(i = 0; i < num_share_modes; i++)
1101 share_mode_entry *share_entry = &old_shares[i];
1104 * Break oplocks before checking share modes. See comment in
1105 * open_file_shared for details.
1106 * Check if someone has an oplock on this file. If so we must
1107 * break it before continuing.
1109 if(share_entry->op_type & BATCH_OPLOCK)
1113 * It appears that the NT redirector may have a bug, in that
1114 * it tries to do an SMBmv on a file that it has open with a
1115 * batch oplock, and then fails to respond to the oplock break
1116 * request. This only seems to occur when the client is doing an
1117 * SMBmv to the smbd it is using - thus we try and detect this
1118 * condition by checking if the file being moved is open and oplocked by
1119 * this smbd process, and then not sending the oplock break in this
1120 * special case. If the file was open with a deny mode that
1121 * prevents the move the SMBmv will fail anyway with a share
1122 * violation error. JRA.
1124 if(rename_op && (share_entry->pid == pid))
1127 DEBUG(0,("check_file_sharing: NT redirector workaround - rename attempted on \
1128 batch oplocked file %s, dev = %x, inode = %.0f\n", fname, (unsigned int)dev, (double)inode));
1131 * This next line is a test that allows the deny-mode
1132 * processing to be skipped. This seems to be needed as
1133 * NT insists on the rename succeeding (in Office 9x no less !).
1134 * This should be removed as soon as (a) MS fix the redirector
1135 * bug or (b) NT SMB support in Samba makes NT not issue the
1136 * call (as is my fervent hope). JRA.
1143 DEBUG(5,("check_file_sharing: breaking oplock (%x) on file %s, \
1144 dev = %x, inode = %.0f\n", share_entry->op_type, fname, (unsigned int)dev, (double)inode));
1146 /* Oplock break.... */
1147 unlock_share_entry(conn, dev, inode, token);
1148 if(request_oplock_break(share_entry, dev, inode) == False)
1150 free((char *)old_shares);
1152 DEBUG(0,("check_file_sharing: FAILED when breaking oplock (%x) on file %s, \
1153 dev = %x, inode = %.0f\n", old_shares[i].op_type, fname, (unsigned int)dev, (double)inode));
1157 lock_share_entry(conn, dev, inode, &token);
1158 broke_oplock = True;
1164 * If this is a delete request and ALLOW_SHARE_DELETE is set then allow
1165 * this to proceed. This takes precedence over share modes.
1168 if(!rename_op && GET_ALLOW_SHARE_DELETE(share_entry->share_mode))
1172 * Someone else has a share lock on it, check to see
1176 if ((GET_DENY_MODE(share_entry->share_mode) != DENY_DOS) || (share_entry->pid != pid))
1183 free((char *)old_shares);
1184 num_share_modes = get_share_modes(conn, token, dev, inode, &old_shares);
1186 } while(broke_oplock);
1189 /* XXXX exactly what share mode combinations should be allowed for
1190 deleting/renaming? */
1192 * If we got here then either there were no share modes or
1193 * all share modes were DENY_DOS and the pid == getpid() or
1194 * delete access was requested and all share modes had the
1195 * ALLOW_SHARE_DELETE bit set (takes precedence over other
1203 unlock_share_entry(conn, dev, inode, token);
1204 if(old_shares != NULL)
1205 free((char *)old_shares);