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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;
struct smb_filename *full_fname_src = NULL;
struct smb_filename *full_fname_dst = NULL;
int ret;
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;
}
full_fname_src = full_path_from_dirfsp_atname(talloc_tos(),
srcfsp,
source);
if (full_fname_src == NULL) {
status = NT_STATUS_NO_MEMORY;
goto out;
}
full_fname_dst = full_path_from_dirfsp_atname(talloc_tos(),
dstfsp,
dest);
if (full_fname_dst == NULL) {
status = NT_STATUS_NO_MEMORY;
goto out;
}
ret = SMB_VFS_NEXT_UNLINKAT(handle,
dstfsp,
dest,
0);
if (ret == -1) {
status = map_nt_error_from_unix(errno);
goto out;
}
/*
* copy_internals() takes attribute values from the NTrename call.
*
* From MS-CIFS:
*
* "If the attribute is 0x0000, then only normal files are renamed.
* If the system file or hidden attributes are specified, then the
* rename is inclusive of both special types."
*/
status = copy_internals(talloc_tos(),
handle->conn,
NULL,
srcfsp, /* src_dirfsp */
full_fname_src,
dstfsp, /* dst_dirfsp */
full_fname_dst,
FILE_ATTRIBUTE_HIDDEN | FILE_ATTRIBUTE_SYSTEM);
if (!NT_STATUS_IS_OK(status)) {
goto out;
}
ret = SMB_VFS_NEXT_UNLINKAT(handle,
srcfsp,
source,
0);
if (ret == -1) {
status = map_nt_error_from_unix(errno);
goto out;
}
out:
TALLOC_FREE(full_fname_src);
TALLOC_FREE(full_fname_dst);
return status;
}
static int crossrename_renameat(vfs_handle_struct *handle,
files_struct *srcfsp,
const struct smb_filename *smb_fname_src,
files_struct *dstfsp,
const struct smb_filename *smb_fname_dst)
{
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,
srcfsp,
smb_fname_src,
dstfsp,
smb_fname_dst);
if ((result == -1) && (errno == EXDEV)) {
/* Rename across filesystems needed. */
NTSTATUS status = copy_reg(handle,
srcfsp,
smb_fname_src,
dstfsp,
smb_fname_dst);
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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