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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 NTSTATUS copy_reg(vfs_handle_struct *handle,
struct files_struct *srcfsp,
const struct smb_filename *source,
struct files_struct *dstfsp,
const struct smb_filename *dest)
{
NTSTATUS status = NT_STATUS_OK;
int ret;
off_t off;
int ifd = -1;
int ofd = -1;
struct timespec ts[2];
if (!VALID_STAT(source->st)) {
status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
goto out;
}
if (!S_ISREG(source->st.st_ex_mode)) {
status = NT_STATUS_OBJECT_PATH_NOT_FOUND;
goto out;
}
if (source->st.st_ex_size > module_sizelimit) {
DBG_INFO("%s: size of %s larger than sizelimit (%lld > %lld), "
"rename prohibited\n",
MODULE,
source->base_name,
(long long)source->st.st_ex_size,
(long long)module_sizelimit);
status = NT_STATUS_INVALID_PARAMETER;
goto out;
}
ret = SMB_VFS_NEXT_UNLINKAT(handle,
dstfsp,
dest,
0);
if (ret == -1 && errno != ENOENT) {
status = map_nt_error_from_unix(errno);
goto out;
}
ifd = openat(fsp_get_pathref_fd(srcfsp),
source->base_name,
O_RDONLY,
0);
if (ifd < 0) {
status = map_nt_error_from_unix(errno);
goto out;
}
ofd = openat(fsp_get_pathref_fd(dstfsp),
dest->base_name,
O_WRONLY | O_CREAT | O_TRUNC | O_NOFOLLOW,
0600);
if (ofd < 0) {
status = map_nt_error_from_unix(errno);
goto out;
}
off = transfer_file(ifd, ofd, source->st.st_ex_size);
if (off == -1) {
status = map_nt_error_from_unix(errno);
goto out;
}
ret = fchown(ofd, source->st.st_ex_uid, source->st.st_ex_gid);
if (ret == -1 && errno != EPERM) {
status = map_nt_error_from_unix(errno);
goto out;
}
/*
* fchown turns off set[ug]id bits for non-root,
* so do the chmod last.
*/
ret = fchmod(ofd, source->st.st_ex_mode & 07777);
if (ret == -1 && errno != EPERM) {
status = map_nt_error_from_unix(errno);
goto out;
}
/* Try to copy the old file's modtime and access time. */
ts[0] = source->st.st_ex_atime;
ts[1] = source->st.st_ex_mtime;
ret = futimens(ofd, ts);
if (ret == -1) {
DBG_DEBUG("Updating the time stamp on destinaton '%s' failed "
"with '%s'. Rename operation can continue.\n",
dest->base_name,
strerror(errno));
}
ret = close(ifd);
if (ret == -1) {
status = map_nt_error_from_unix(errno);
goto out;
}
ifd = -1;
ret = close(ofd);
if (ret == -1) {
status = map_nt_error_from_unix(errno);
goto out;
}
ofd = -1;
ret = SMB_VFS_NEXT_UNLINKAT(handle, srcfsp, source, 0);
if (ret == -1) {
status = map_nt_error_from_unix(errno);
}
out:
if (ifd != -1) {
ret = close(ifd);
if (ret == -1) {
DBG_DEBUG("Failed to close %s (%d): %s.\n",
source->base_name,
ifd,
strerror(errno));
}
}
if (ofd != -1) {
ret = close(ofd);
if (ret == -1) {
DBG_DEBUG("Failed to close %s (%d): %s.\n",
dest->base_name,
ofd,
strerror(errno));
}
}
return status;
}
static int crossrename_renameat(vfs_handle_struct *handle,
files_struct *src_dirfsp,
const struct smb_filename *smb_fname_src,
files_struct *dst_dirfsp,
const struct smb_filename *smb_fname_dst,
const struct vfs_rename_how *how)
{
int result = -1;
START_PROFILE(syscall_renameat);
if (smb_fname_src->stream_name || smb_fname_dst->stream_name) {
errno = ENOENT;
goto out;
}
result = SMB_VFS_NEXT_RENAMEAT(handle,
src_dirfsp,
smb_fname_src,
dst_dirfsp,
smb_fname_dst,
how);
if ((result == -1) && (errno == EXDEV)) {
/* Rename across filesystems needed. */
NTSTATUS status = copy_reg(handle,
src_dirfsp,
smb_fname_src,
dst_dirfsp,
smb_fname_dst);
result = 0;
if (!NT_STATUS_IS_OK(status)) {
errno = map_errno_from_nt_status(status);
result = -1;
}
}
out:
END_PROFILE(syscall_renameat);
return result;
}
static struct vfs_fn_pointers vfs_crossrename_fns = {
.connect_fn = crossrename_connect,
.renameat_fn = crossrename_renameat
};
static_decl_vfs;
NTSTATUS vfs_crossrename_init(TALLOC_CTX *ctx)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, MODULE,
&vfs_crossrename_fns);
}
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