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/*
Unix SMB/Netbios implementation.
Version 1.9.
file closing
Copyright (C) Andrew Tridgell 1992-1998
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
/****************************************************************************
run a file if it is a magic script
****************************************************************************/
static void check_magic(files_struct *fsp,connection_struct *conn)
{
if (!*lp_magicscript(SNUM(conn)))
return;
DEBUG(5,("checking magic for %s\n",fsp->fsp_name));
{
char *p;
if (!(p = strrchr_m(fsp->fsp_name,'/')))
p = fsp->fsp_name;
else
p++;
if (!strequal(lp_magicscript(SNUM(conn)),p))
return;
}
{
int ret;
pstring magic_output;
pstring fname;
SMB_STRUCT_STAT st;
int tmp_fd, outfd;
pstrcpy(fname,fsp->fsp_name);
if (*lp_magicoutput(SNUM(conn)))
pstrcpy(magic_output,lp_magicoutput(SNUM(conn)));
else
slprintf(magic_output,sizeof(fname)-1, "%s.out",fname);
chmod(fname,0755);
ret = smbrun(fname,&tmp_fd);
DEBUG(3,("Invoking magic command %s gave %d\n",fname,ret));
unlink(fname);
if (ret != 0 || tmp_fd == -1) {
if (tmp_fd != -1)
close(tmp_fd);
return;
}
outfd = open(magic_output, O_CREAT|O_EXCL|O_RDWR, 0600);
if (outfd == -1) {
close(tmp_fd);
return;
}
if (sys_fstat(tmp_fd,&st) == -1) {
close(tmp_fd);
close(outfd);
return;
}
transfer_file(tmp_fd,outfd,st.st_size);
close(tmp_fd);
close(outfd);
}
}
/****************************************************************************
Common code to close a file or a directory.
****************************************************************************/
This is a *big* checkin that may break some things, but implements the 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.
-
static int close_filestruct(files_struct *fsp)
{
connection_struct *conn = fsp->conn;
int ret = 0;
if(flush_write_cache(fsp, CLOSE_FLUSH) == -1)
ret = -1;
delete_write_cache(fsp);
fsp->is_directory = False;
fsp->stat_open = False;
conn->num_files_open--;
return ret;
}
/****************************************************************************
Close a file.
If normal_close is 1 then this came from a normal SMBclose (or equivalent)
operation otherwise it came as the result of some other operation such as
the closing of the connection. In the latter case printing and
magic scripts are not run.
****************************************************************************/
static int close_normal_file(files_struct *fsp, BOOL normal_close)
{
share_mode_entry *share_entry = NULL;
size_t share_entry_count = 0;
BOOL delete_on_close = False;
connection_struct *conn = fsp->conn;
time_t pending_modtime = fsp->pending_modtime;
int err = 0;
int err1 = 0;
remove_pending_lock_requests_by_fid(fsp);
/*
* If we're flushing on a close we can get a write
* error here, we must remember this.
*/
if (close_filestruct(fsp) == -1)
err1 = -1;
if (fsp->print_file) {
print_fsp_end(fsp, normal_close);
file_free(fsp);
return 0;
}
/*
* Lock the share entries, and determine if we should delete
* on close. If so delete whilst the lock is still in effect.
* This prevents race conditions with the file being created. JRA.
*/
lock_share_entry_fsp(fsp);
share_entry_count = del_share_mode(fsp, &share_entry);
DEBUG(10,("close_normal_file: share_entry_count = %d for file %s\n",
share_entry_count, fsp->fsp_name ));
/*
* We delete on close if it's the last open, and the
* delete on close flag was set in the entry we just deleted.
*/
if ((share_entry_count == 0) && share_entry &&
GET_DELETE_ON_CLOSE_FLAG(share_entry->share_mode) )
delete_on_close = True;
SAFE_FREE(share_entry);
/*
* NT can set delete_on_close of the last open
* reference to a file.
*/
if (normal_close && delete_on_close) {
DEBUG(5,("close_file: file %s. Delete on close was set - deleting file.\n",
fsp->fsp_name));
if(fsp->conn->vfs_ops.unlink(conn,fsp->fsp_name) != 0) {
/*
* This call can potentially fail as another smbd may have
* had the file open with delete on close set and deleted
* it when its last reference to this file went away. Hence
* we log this but not at debug level zero.
*/
DEBUG(5,("close_file: file %s. Delete on close was set and unlink failed \
with error %s\n", fsp->fsp_name, strerror(errno) ));
}
}
unlock_share_entry_fsp(fsp);
if(EXCLUSIVE_OPLOCK_TYPE(fsp->oplock_type))
release_file_oplock(fsp);
locking_close_file(fsp);
err = fd_close(conn, fsp);
/* check for magic scripts */
if (normal_close) {
check_magic(fsp,conn);
}
/*
* Ensure pending modtime is set after close.
*/
if(fsp->pending_modtime) {
int saved_errno = errno;
set_filetime(conn, fsp->fsp_name, fsp->pending_modtime);
errno = saved_errno;
}
DEBUG(2,("%s closed file %s (numopen=%d) %s\n",
conn->user,fsp->fsp_name,
conn->num_files_open, err ? strerror(err) : ""));
if (fsp->fsp_name)
string_free(&fsp->fsp_name);
file_free(fsp);
if (err == -1 || err1 == -1)
return -1;
else
return 0;
}
/****************************************************************************
Close a directory opened by an NT SMB call.
****************************************************************************/
static int close_directory(files_struct *fsp, BOOL normal_close)
{
remove_pending_change_notify_requests_by_fid(fsp);
/*
* NT can set delete_on_close of the last open
* reference to a directory also.
*/
if (normal_close && fsp->directory_delete_on_close) {
BOOL ok = rmdir_internals(fsp->conn, fsp->fsp_name);
DEBUG(5,("close_directory: %s. Delete on close was set - deleting directory %s.\n",
fsp->fsp_name, ok ? "succeeded" : "failed" ));
/*
* Ensure we remove any change notify requests that would
* now fail as the directory has been deleted.
*/
if(ok)
remove_pending_change_notify_requests_by_filename(fsp);
}
/*
* Do the code common to files and directories.
*/
close_filestruct(fsp);
if (fsp->fsp_name)
string_free(&fsp->fsp_name);
file_free(fsp);
return 0;
}
/****************************************************************************
Close a file opened with null permissions in order to read permissions.
****************************************************************************/
static int close_statfile(files_struct *fsp, BOOL normal_close)
{
close_filestruct(fsp);
if (fsp->fsp_name)
string_free(&fsp->fsp_name);
file_free(fsp);
return 0;
}
/****************************************************************************
Close a directory opened by an NT SMB call.
****************************************************************************/
int close_file(files_struct *fsp, BOOL normal_close)
{
if(fsp->is_directory)
return close_directory(fsp, normal_close);
else if(fsp->stat_open)
return close_statfile(fsp, normal_close);
return close_normal_file(fsp, normal_close);
}