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samba-mirror/source3/modules/vfs_xattr_tdb.c
Volker Lendecke 818103c825 vfs: Fix a typo
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Jeremy Allison <jra@samba.org>
2020-10-02 21:30:33 +00:00

741 lines
16 KiB
C

/*
* Store posix-level xattrs in a tdb
*
* Copyright (C) Volker Lendecke, 2007
* Copyright (C) Andrew Bartlett, 2012
*
* 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 "system/filesys.h"
#include "smbd/smbd.h"
#include "dbwrap/dbwrap.h"
#include "dbwrap/dbwrap_open.h"
#include "source3/lib/xattr_tdb.h"
#include "lib/util/tevent_unix.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_VFS
static bool xattr_tdb_init(int snum, TALLOC_CTX *mem_ctx, struct db_context **p_db);
static int xattr_tdb_get_file_id(struct vfs_handle_struct *handle,
const char *path, struct file_id *id)
{
int ret;
TALLOC_CTX *frame = talloc_stackframe();
struct smb_filename *smb_fname;
smb_fname = synthetic_smb_fname(frame,
path,
NULL,
NULL,
0,
0);
if (smb_fname == NULL) {
TALLOC_FREE(frame);
errno = ENOMEM;
return -1;
}
ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
if (ret == -1) {
TALLOC_FREE(frame);
return -1;
}
*id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &smb_fname->st);
TALLOC_FREE(frame);
return 0;
}
static ssize_t xattr_tdb_getxattr(struct vfs_handle_struct *handle,
const struct smb_filename *smb_fname,
const char *name,
void *value,
size_t size)
{
struct file_id id;
struct db_context *db;
ssize_t xattr_size;
int ret;
DATA_BLOB blob;
TALLOC_CTX *frame = talloc_stackframe();
SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
if (!xattr_tdb_init(-1, frame, &db))
{
TALLOC_FREE(frame); return -1;
});
ret = xattr_tdb_get_file_id(handle, smb_fname->base_name, &id);
if (ret == -1) {
TALLOC_FREE(frame);
return -1;
}
xattr_size = xattr_tdb_getattr(db, frame, &id, name, &blob);
if (xattr_size < 0) {
errno = ENOATTR;
TALLOC_FREE(frame);
return -1;
}
if (size == 0) {
TALLOC_FREE(frame);
return xattr_size;
}
if (blob.length > size) {
TALLOC_FREE(frame);
errno = ERANGE;
return -1;
}
memcpy(value, blob.data, xattr_size);
TALLOC_FREE(frame);
return xattr_size;
}
struct xattr_tdb_getxattrat_state {
struct vfs_aio_state vfs_aio_state;
ssize_t xattr_size;
uint8_t *xattr_value;
};
static struct tevent_req *xattr_tdb_getxattrat_send(
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct vfs_handle_struct *handle,
files_struct *dir_fsp,
const struct smb_filename *smb_fname,
const char *xattr_name,
size_t alloc_hint)
{
struct tevent_req *req = NULL;
struct xattr_tdb_getxattrat_state *state = NULL;
struct smb_filename *cwd = NULL;
struct db_context *db = NULL;
struct file_id id;
int ret;
int error;
int cwd_ret;
DATA_BLOB xattr_blob;
req = tevent_req_create(mem_ctx, &state,
struct xattr_tdb_getxattrat_state);
if (req == NULL) {
return NULL;
}
state->xattr_size = -1;
SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
if (!xattr_tdb_init(-1, state, &db)) {
tevent_req_error(req, EIO);
return tevent_req_post(req, ev);
});
cwd = SMB_VFS_GETWD(dir_fsp->conn, state);
if (tevent_req_nomem(cwd, req)) {
return tevent_req_post(req, ev);
}
ret = SMB_VFS_CHDIR(dir_fsp->conn, dir_fsp->fsp_name);
if (ret != 0) {
tevent_req_error(req, errno);
return tevent_req_post(req, ev);
}
ret = xattr_tdb_get_file_id(handle, smb_fname->base_name, &id);
error = errno;
cwd_ret = SMB_VFS_CHDIR(dir_fsp->conn, cwd);
SMB_ASSERT(cwd_ret == 0);
if (ret == -1) {
tevent_req_error(req, error);
return tevent_req_post(req, ev);
}
state->xattr_size = xattr_tdb_getattr(db,
state,
&id,
xattr_name,
&xattr_blob);
if (state->xattr_size == -1) {
tevent_req_error(req, errno);
return tevent_req_post(req, ev);
}
if (alloc_hint == 0) {
/*
* The caller only wants to know the size.
*/
tevent_req_done(req);
return tevent_req_post(req, ev);
}
if (state->xattr_size == 0) {
/*
* There's no data.
*/
tevent_req_done(req);
return tevent_req_post(req, ev);
}
if (xattr_blob.length > alloc_hint) {
/*
* The data doesn't fit.
*/
state->xattr_size = -1;
tevent_req_error(req, ERANGE);
return tevent_req_post(req, ev);
}
/*
* take the whole blob.
*/
state->xattr_value = xattr_blob.data;
tevent_req_done(req);
return tevent_req_post(req, ev);
}
static ssize_t xattr_tdb_getxattrat_recv(struct tevent_req *req,
struct vfs_aio_state *aio_state,
TALLOC_CTX *mem_ctx,
uint8_t **xattr_value)
{
struct xattr_tdb_getxattrat_state *state = tevent_req_data(
req, struct xattr_tdb_getxattrat_state);
ssize_t xattr_size;
if (tevent_req_is_unix_error(req, &aio_state->error)) {
tevent_req_received(req);
return -1;
}
*aio_state = state->vfs_aio_state;
xattr_size = state->xattr_size;
if (xattr_value != NULL) {
*xattr_value = talloc_move(mem_ctx, &state->xattr_value);
}
tevent_req_received(req);
return xattr_size;
}
static ssize_t xattr_tdb_fgetxattr(struct vfs_handle_struct *handle,
struct files_struct *fsp,
const char *name, void *value, size_t size)
{
SMB_STRUCT_STAT sbuf;
struct file_id id;
struct db_context *db;
ssize_t xattr_size;
DATA_BLOB blob;
TALLOC_CTX *frame = talloc_stackframe();
SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
if (!xattr_tdb_init(-1, frame, &db))
{
TALLOC_FREE(frame); return -1;
});
if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
TALLOC_FREE(frame);
return -1;
}
id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
xattr_size = xattr_tdb_getattr(db, frame, &id, name, &blob);
if (xattr_size < 0) {
errno = ENOATTR;
TALLOC_FREE(frame);
return -1;
}
if (size == 0) {
TALLOC_FREE(frame);
return xattr_size;
}
if (blob.length > size) {
TALLOC_FREE(frame);
errno = ERANGE;
return -1;
}
memcpy(value, blob.data, xattr_size);
TALLOC_FREE(frame);
return xattr_size;
}
static int xattr_tdb_setxattr(struct vfs_handle_struct *handle,
const struct smb_filename *smb_fname,
const char *name,
const void *value,
size_t size,
int flags)
{
struct file_id id;
struct db_context *db;
int ret;
TALLOC_CTX *frame = talloc_stackframe();
SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
if (!xattr_tdb_init(-1, frame, &db))
{
TALLOC_FREE(frame); return -1;
});
ret = xattr_tdb_get_file_id(handle, smb_fname->base_name, &id);
if (ret == -1) {
TALLOC_FREE(frame);
return -1;
}
ret = xattr_tdb_setattr(db, &id, name, value, size, flags);
TALLOC_FREE(frame);
return ret;
}
static int xattr_tdb_fsetxattr(struct vfs_handle_struct *handle,
struct files_struct *fsp,
const char *name, const void *value,
size_t size, int flags)
{
SMB_STRUCT_STAT sbuf;
struct file_id id;
struct db_context *db;
int ret;
TALLOC_CTX *frame = talloc_stackframe();
SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
if (!xattr_tdb_init(-1, frame, &db))
{
TALLOC_FREE(frame); return -1;
});
if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
TALLOC_FREE(frame);
return -1;
}
id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
ret = xattr_tdb_setattr(db, &id, name, value, size, flags);
TALLOC_FREE(frame);
return ret;
}
static ssize_t xattr_tdb_listxattr(struct vfs_handle_struct *handle,
const struct smb_filename *smb_fname,
char *list,
size_t size)
{
struct file_id id;
struct db_context *db;
int ret;
TALLOC_CTX *frame = talloc_stackframe();
SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
if (!xattr_tdb_init(-1, frame, &db))
{
TALLOC_FREE(frame); return -1;
});
ret = xattr_tdb_get_file_id(handle, smb_fname->base_name, &id);
if (ret == -1) {
TALLOC_FREE(frame);
return -1;
}
ret = xattr_tdb_listattr(db, &id, list, size);
TALLOC_FREE(frame);
return ret;
}
static ssize_t xattr_tdb_flistxattr(struct vfs_handle_struct *handle,
struct files_struct *fsp, char *list,
size_t size)
{
SMB_STRUCT_STAT sbuf;
struct file_id id;
struct db_context *db;
int ret;
TALLOC_CTX *frame = talloc_stackframe();
SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
if (!xattr_tdb_init(-1, frame, &db))
{
TALLOC_FREE(frame); return -1;
});
if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
TALLOC_FREE(frame);
return -1;
}
id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
ret = xattr_tdb_listattr(db, &id, list, size);
TALLOC_FREE(frame);
return ret;
}
static int xattr_tdb_removexattr(struct vfs_handle_struct *handle,
const struct smb_filename *smb_fname,
const char *name)
{
struct file_id id;
struct db_context *db;
int ret;
TALLOC_CTX *frame = talloc_stackframe();
SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
if (!xattr_tdb_init(-1, frame, &db))
{
TALLOC_FREE(frame); return -1;
});
ret = xattr_tdb_get_file_id(handle, smb_fname->base_name, &id);
if (ret == -1) {
TALLOC_FREE(frame);
return ret;
}
ret = xattr_tdb_removeattr(db, &id, name);
TALLOC_FREE(frame);
return ret;
}
static int xattr_tdb_fremovexattr(struct vfs_handle_struct *handle,
struct files_struct *fsp, const char *name)
{
SMB_STRUCT_STAT sbuf;
struct file_id id;
struct db_context *db;
int ret;
TALLOC_CTX *frame = talloc_stackframe();
SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
if (!xattr_tdb_init(-1, frame, &db))
{
TALLOC_FREE(frame); return -1;
});
if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
TALLOC_FREE(frame);
return -1;
}
id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
ret = xattr_tdb_removeattr(db, &id, name);
TALLOC_FREE(frame);
return ret;
}
/*
* Open the tdb file upon VFS_CONNECT
*/
static bool xattr_tdb_init(int snum, TALLOC_CTX *mem_ctx, struct db_context **p_db)
{
struct db_context *db;
const char *dbname;
char *def_dbname;
def_dbname = state_path(talloc_tos(), "xattr.tdb");
if (def_dbname == NULL) {
errno = ENOSYS;
return false;
}
dbname = lp_parm_const_string(snum, "xattr_tdb", "file", def_dbname);
/* now we know dbname is not NULL */
become_root();
db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600,
DBWRAP_LOCK_ORDER_2, DBWRAP_FLAG_NONE);
unbecome_root();
if (db == NULL) {
#if defined(ENOTSUP)
errno = ENOTSUP;
#else
errno = ENOSYS;
#endif
TALLOC_FREE(def_dbname);
return false;
}
*p_db = db;
TALLOC_FREE(def_dbname);
return true;
}
static int xattr_tdb_openat(struct vfs_handle_struct *handle,
const struct files_struct *dirfsp,
const struct smb_filename *smb_fname,
struct files_struct *fsp,
int flags,
mode_t mode)
{
struct db_context *db = NULL;
TALLOC_CTX *frame = NULL;
SMB_STRUCT_STAT sbuf;
int ret;
fsp->fh->fd = SMB_VFS_NEXT_OPENAT(handle,
dirfsp,
smb_fname,
fsp,
flags,
mode);
if (fsp->fh->fd < 0) {
return fsp->fh->fd;
}
if ((flags & (O_CREAT|O_EXCL)) != (O_CREAT|O_EXCL)) {
return fsp->fh->fd;
}
/*
* We know we used O_CREAT|O_EXCL and it worked.
* We must have created the file.
*/
ret = SMB_VFS_FSTAT(fsp, &sbuf);
if (ret == -1) {
/* Can't happen... */
DBG_WARNING("SMB_VFS_FSTAT failed on file %s (%s)\n",
smb_fname_str_dbg(smb_fname),
strerror(errno));
return -1;
}
fsp->file_id = SMB_VFS_FILE_ID_CREATE(fsp->conn, &sbuf);
frame = talloc_stackframe();
SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
if (!xattr_tdb_init(-1, frame, &db))
{
TALLOC_FREE(frame); return -1;
});
xattr_tdb_remove_all_attrs(db, &fsp->file_id);
TALLOC_FREE(frame);
return fsp->fh->fd;
}
static int xattr_tdb_mkdirat(vfs_handle_struct *handle,
struct files_struct *dirfsp,
const struct smb_filename *smb_fname,
mode_t mode)
{
struct db_context *db = NULL;
TALLOC_CTX *frame = NULL;
struct file_id fileid;
int ret;
struct smb_filename *smb_fname_tmp = NULL;
ret = SMB_VFS_NEXT_MKDIRAT(handle,
dirfsp,
smb_fname,
mode);
if (ret < 0) {
return ret;
}
frame = talloc_stackframe();
smb_fname_tmp = cp_smb_filename(frame, smb_fname);
if (smb_fname_tmp == NULL) {
TALLOC_FREE(frame);
errno = ENOMEM;
return -1;
}
/* Always use LSTAT here - we just created the directory. */
ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
if (ret == -1) {
/* Rename race. Let upper level take care of it. */
TALLOC_FREE(frame);
return -1;
}
if (!S_ISDIR(smb_fname_tmp->st.st_ex_mode)) {
/* Rename race. Let upper level take care of it. */
TALLOC_FREE(frame);
return -1;
}
fileid = SMB_VFS_FILE_ID_CREATE(handle->conn, &smb_fname_tmp->st);
SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
if (!xattr_tdb_init(-1, frame, &db))
{
TALLOC_FREE(frame); return -1;
});
xattr_tdb_remove_all_attrs(db, &fileid);
TALLOC_FREE(frame);
return 0;
}
/*
* On unlink we need to delete the tdb record
*/
static int xattr_tdb_unlinkat(vfs_handle_struct *handle,
struct files_struct *dirfsp,
const struct smb_filename *smb_fname,
int flags)
{
struct smb_filename *smb_fname_tmp = NULL;
struct file_id id;
struct db_context *db;
int ret = -1;
bool remove_record = false;
TALLOC_CTX *frame = talloc_stackframe();
SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
if (!xattr_tdb_init(-1, frame, &db))
{
TALLOC_FREE(frame); return -1;
});
smb_fname_tmp = cp_smb_filename(frame, smb_fname);
if (smb_fname_tmp == NULL) {
TALLOC_FREE(frame);
errno = ENOMEM;
return -1;
}
if (smb_fname_tmp->flags & SMB_FILENAME_POSIX_PATH) {
ret = SMB_VFS_NEXT_LSTAT(handle, smb_fname_tmp);
} else {
ret = SMB_VFS_NEXT_STAT(handle, smb_fname_tmp);
}
if (ret == -1) {
goto out;
}
if (flags & AT_REMOVEDIR) {
/* Always remove record when removing a directory succeeds. */
remove_record = true;
} else {
if (smb_fname_tmp->st.st_ex_nlink == 1) {
/* Only remove record on last link to file. */
remove_record = true;
}
}
ret = SMB_VFS_NEXT_UNLINKAT(handle,
dirfsp,
smb_fname_tmp,
flags);
if (ret == -1) {
goto out;
}
if (!remove_record) {
goto out;
}
id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &smb_fname_tmp->st);
xattr_tdb_remove_all_attrs(db, &id);
out:
TALLOC_FREE(frame);
return ret;
}
/*
* Destructor for the VFS private data
*/
static void close_xattr_db(void **data)
{
struct db_context **p_db = (struct db_context **)data;
TALLOC_FREE(*p_db);
}
static int xattr_tdb_connect(vfs_handle_struct *handle, const char *service,
const char *user)
{
char *sname = NULL;
int res, snum;
struct db_context *db;
res = SMB_VFS_NEXT_CONNECT(handle, service, user);
if (res < 0) {
return res;
}
snum = find_service(talloc_tos(), service, &sname);
if (snum == -1 || sname == NULL) {
/*
* Should not happen, but we should not fail just *here*.
*/
return 0;
}
if (!xattr_tdb_init(snum, NULL, &db)) {
DEBUG(5, ("Could not init xattr tdb\n"));
lp_do_parameter(snum, "ea support", "False");
return 0;
}
lp_do_parameter(snum, "ea support", "True");
SMB_VFS_HANDLE_SET_DATA(handle, db, close_xattr_db,
struct db_context, return -1);
return 0;
}
static struct vfs_fn_pointers vfs_xattr_tdb_fns = {
.getxattr_fn = xattr_tdb_getxattr,
.getxattrat_send_fn = xattr_tdb_getxattrat_send,
.getxattrat_recv_fn = xattr_tdb_getxattrat_recv,
.fgetxattr_fn = xattr_tdb_fgetxattr,
.setxattr_fn = xattr_tdb_setxattr,
.fsetxattr_fn = xattr_tdb_fsetxattr,
.listxattr_fn = xattr_tdb_listxattr,
.flistxattr_fn = xattr_tdb_flistxattr,
.removexattr_fn = xattr_tdb_removexattr,
.fremovexattr_fn = xattr_tdb_fremovexattr,
.openat_fn = xattr_tdb_openat,
.mkdirat_fn = xattr_tdb_mkdirat,
.unlinkat_fn = xattr_tdb_unlinkat,
.connect_fn = xattr_tdb_connect,
};
static_decl_vfs;
NTSTATUS vfs_xattr_tdb_init(TALLOC_CTX *ctx)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "xattr_tdb",
&vfs_xattr_tdb_fns);
}