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/*
* Copyright (c) Björn Jacke 2010
*
* 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 3 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, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "smbd/smbd.h"
#include "system/filesys.h"
#include "transfer_file.h"
#include "smbprofile.h"
#define MODULE "crossrename"
static off_t module_sizelimit;
static int crossrename_connect(
struct vfs_handle_struct * handle,
const char * service,
const char * user)
{
int ret = SMB_VFS_NEXT_CONNECT(handle, service, user);
if (ret < 0) {
return ret;
}
module_sizelimit = (off_t) lp_parm_int(SNUM(handle->conn),
MODULE, "sizelimit", 20);
/* convert from MiB to byte: */
module_sizelimit *= 1048576;
return 0;
}
/*********************************************************
For rename across filesystems initial Patch from Warren Birnbaum
<warrenb@hpcvscdp.cv.hp.com>
**********************************************************/
static int copy_reg(const char *source, const char *dest)
{
SMB_STRUCT_STAT source_stats;
int saved_errno;
int ifd = -1;
int ofd = -1;
if (sys_lstat(source, &source_stats, false) == -1)
return -1;
if (!S_ISREG (source_stats.st_ex_mode))
return -1;
if (source_stats.st_ex_size > module_sizelimit) {
DEBUG(5,
("%s: size of %s larger than sizelimit (%lld > %lld), rename prohititted\n",
MODULE, source,
(long long)source_stats.st_ex_size,
(long long)module_sizelimit));
return -1;
}
if((ifd = open (source, O_RDONLY, 0)) < 0)
return -1;
if (unlink (dest) && errno != ENOENT) {
close(ifd);
return -1;
}
#ifdef O_NOFOLLOW
if((ofd = open (dest, O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW, 0600)) < 0 )
#else
if((ofd = open (dest, O_WRONLY | O_CREAT | O_TRUNC , 0600)) < 0 )
#endif
goto err;
if (transfer_file(ifd, ofd, source_stats.st_ex_size) == -1)
goto err;
/*
* Try to preserve ownership. For non-root it might fail, but that's ok.
* But root probably wants to know, e.g. if NFS disallows it.
*/
#ifdef HAVE_FCHOWN
if ((fchown(ofd, source_stats.st_ex_uid, source_stats.st_ex_gid) == -1) && (errno != EPERM))
#else
if ((chown(dest, source_stats.st_ex_uid, source_stats.st_ex_gid) == -1) && (errno != EPERM))
#endif
goto err;
/*
* fchown turns off set[ug]id bits for non-root,
* so do the chmod last.
*/
#if defined(HAVE_FCHMOD)
if (fchmod (ofd, source_stats.st_ex_mode & 07777))
#else
if (chmod (dest, source_stats.st_ex_mode & 07777))
#endif
goto err;
if (close (ifd) == -1)
goto err;
if (close (ofd) == -1)
return -1;
/* Try to copy the old file's modtime and access time. */
#if defined(HAVE_UTIMENSAT)
{
struct timespec ts[2];
ts[0] = source_stats.st_ex_atime;
ts[1] = source_stats.st_ex_mtime;
utimensat(AT_FDCWD, dest, ts, AT_SYMLINK_NOFOLLOW);
}
#elif defined(HAVE_UTIMES)
{
struct timeval tv[2];
tv[0] = convert_timespec_to_timeval(source_stats.st_ex_atime);
tv[1] = convert_timespec_to_timeval(source_stats.st_ex_mtime);
#ifdef HAVE_LUTIMES
lutimes(dest, tv);
#else
utimes(dest, tv);
#endif
}
#elif defined(HAVE_UTIME)
{
struct utimbuf tv;
tv.actime = convert_timespec_to_time_t(source_stats.st_ex_atime);
tv.modtime = convert_timespec_to_time_t(source_stats.st_ex_mtime);
utime(dest, &tv);
}
#endif
if (unlink (source) == -1)
return -1;
return 0;
err:
saved_errno = errno;
if (ifd != -1)
close(ifd);
if (ofd != -1)
close(ofd);
errno = saved_errno;
return -1;
}
static int crossrename_rename(vfs_handle_struct *handle,
const struct smb_filename *smb_fname_src,
const struct smb_filename *smb_fname_dst)
{
int result = -1;
START_PROFILE(syscall_rename);
if (smb_fname_src->stream_name || smb_fname_dst->stream_name) {
errno = ENOENT;
goto out;
}
result = rename(smb_fname_src->base_name, smb_fname_dst->base_name);
if ((result == -1) && (errno == EXDEV)) {
/* Rename across filesystems needed. */
result = copy_reg(smb_fname_src->base_name,
smb_fname_dst->base_name);
}
out:
END_PROFILE(syscall_rename);
return result;
}
static struct vfs_fn_pointers vfs_crossrename_fns = {
.connect_fn = crossrename_connect,
.rename_fn = crossrename_rename
};
NTSTATUS vfs_crossrename_init(void);
NTSTATUS vfs_crossrename_init(void)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, MODULE,
&vfs_crossrename_fns);
}
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