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https://github.com/samba-team/samba.git
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ce9cdeb350
No longer used. Signed-off-by: Jeremy Allison <jra@samba.org> Reviewed-by: Ralph Boehme <slow@samba.org>
624 lines
14 KiB
C
624 lines
14 KiB
C
/*
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* Store posix-level xattrs in a tdb
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*
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* Copyright (C) Volker Lendecke, 2007
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* Copyright (C) Andrew Bartlett, 2012
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "system/filesys.h"
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#include "smbd/smbd.h"
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#include "dbwrap/dbwrap.h"
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#include "dbwrap/dbwrap_open.h"
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#include "source3/lib/xattr_tdb.h"
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#include "lib/util/tevent_unix.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_VFS
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static bool xattr_tdb_init(int snum, TALLOC_CTX *mem_ctx, struct db_context **p_db);
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static int xattr_tdb_get_file_id(struct vfs_handle_struct *handle,
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const char *path, struct file_id *id)
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{
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int ret;
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TALLOC_CTX *frame = talloc_stackframe();
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struct smb_filename *smb_fname;
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smb_fname = synthetic_smb_fname(frame,
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path,
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NULL,
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NULL,
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0,
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0);
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if (smb_fname == NULL) {
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TALLOC_FREE(frame);
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errno = ENOMEM;
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return -1;
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}
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ret = SMB_VFS_NEXT_STAT(handle, smb_fname);
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if (ret == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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*id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &smb_fname->st);
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TALLOC_FREE(frame);
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return 0;
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}
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struct xattr_tdb_getxattrat_state {
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struct vfs_aio_state vfs_aio_state;
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ssize_t xattr_size;
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uint8_t *xattr_value;
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};
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static struct tevent_req *xattr_tdb_getxattrat_send(
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TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct vfs_handle_struct *handle,
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files_struct *dir_fsp,
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const struct smb_filename *smb_fname,
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const char *xattr_name,
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size_t alloc_hint)
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{
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struct tevent_req *req = NULL;
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struct xattr_tdb_getxattrat_state *state = NULL;
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struct smb_filename *cwd = NULL;
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struct db_context *db = NULL;
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struct file_id id;
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int ret;
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int error;
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int cwd_ret;
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DATA_BLOB xattr_blob;
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req = tevent_req_create(mem_ctx, &state,
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struct xattr_tdb_getxattrat_state);
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if (req == NULL) {
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return NULL;
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}
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state->xattr_size = -1;
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, state, &db)) {
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tevent_req_error(req, EIO);
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return tevent_req_post(req, ev);
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});
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cwd = SMB_VFS_GETWD(dir_fsp->conn, state);
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if (tevent_req_nomem(cwd, req)) {
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return tevent_req_post(req, ev);
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}
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ret = SMB_VFS_CHDIR(dir_fsp->conn, dir_fsp->fsp_name);
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if (ret != 0) {
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tevent_req_error(req, errno);
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return tevent_req_post(req, ev);
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}
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ret = xattr_tdb_get_file_id(handle, smb_fname->base_name, &id);
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error = errno;
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cwd_ret = SMB_VFS_CHDIR(dir_fsp->conn, cwd);
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SMB_ASSERT(cwd_ret == 0);
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if (ret == -1) {
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tevent_req_error(req, error);
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return tevent_req_post(req, ev);
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}
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state->xattr_size = xattr_tdb_getattr(db,
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state,
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&id,
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xattr_name,
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&xattr_blob);
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if (state->xattr_size == -1) {
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tevent_req_error(req, errno);
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return tevent_req_post(req, ev);
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}
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if (alloc_hint == 0) {
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/*
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* The caller only wants to know the size.
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*/
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tevent_req_done(req);
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return tevent_req_post(req, ev);
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}
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if (state->xattr_size == 0) {
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/*
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* There's no data.
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*/
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tevent_req_done(req);
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return tevent_req_post(req, ev);
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}
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if (xattr_blob.length > alloc_hint) {
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/*
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* The data doesn't fit.
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*/
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state->xattr_size = -1;
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tevent_req_error(req, ERANGE);
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return tevent_req_post(req, ev);
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}
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/*
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* take the whole blob.
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*/
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state->xattr_value = xattr_blob.data;
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tevent_req_done(req);
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return tevent_req_post(req, ev);
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}
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static ssize_t xattr_tdb_getxattrat_recv(struct tevent_req *req,
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struct vfs_aio_state *aio_state,
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TALLOC_CTX *mem_ctx,
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uint8_t **xattr_value)
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{
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struct xattr_tdb_getxattrat_state *state = tevent_req_data(
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req, struct xattr_tdb_getxattrat_state);
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ssize_t xattr_size;
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if (tevent_req_is_unix_error(req, &aio_state->error)) {
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tevent_req_received(req);
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return -1;
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}
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*aio_state = state->vfs_aio_state;
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xattr_size = state->xattr_size;
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if (xattr_value != NULL) {
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*xattr_value = talloc_move(mem_ctx, &state->xattr_value);
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}
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tevent_req_received(req);
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return xattr_size;
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}
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static ssize_t xattr_tdb_fgetxattr(struct vfs_handle_struct *handle,
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struct files_struct *fsp,
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const char *name, void *value, size_t size)
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{
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SMB_STRUCT_STAT sbuf;
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struct file_id id;
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struct db_context *db;
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ssize_t xattr_size;
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DATA_BLOB blob;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
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xattr_size = xattr_tdb_getattr(db, frame, &id, name, &blob);
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if (xattr_size < 0) {
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errno = ENOATTR;
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TALLOC_FREE(frame);
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return -1;
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}
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if (size == 0) {
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TALLOC_FREE(frame);
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return xattr_size;
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}
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if (blob.length > size) {
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TALLOC_FREE(frame);
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errno = ERANGE;
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return -1;
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}
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memcpy(value, blob.data, xattr_size);
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TALLOC_FREE(frame);
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return xattr_size;
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}
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static int xattr_tdb_fsetxattr(struct vfs_handle_struct *handle,
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struct files_struct *fsp,
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const char *name, const void *value,
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size_t size, int flags)
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{
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SMB_STRUCT_STAT sbuf;
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struct file_id id;
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struct db_context *db;
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int ret;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
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ret = xattr_tdb_setattr(db, &id, name, value, size, flags);
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TALLOC_FREE(frame);
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return ret;
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}
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static ssize_t xattr_tdb_flistxattr(struct vfs_handle_struct *handle,
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struct files_struct *fsp, char *list,
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size_t size)
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{
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SMB_STRUCT_STAT sbuf;
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struct file_id id;
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struct db_context *db;
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int ret;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
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ret = xattr_tdb_listattr(db, &id, list, size);
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TALLOC_FREE(frame);
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return ret;
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}
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static int xattr_tdb_fremovexattr(struct vfs_handle_struct *handle,
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struct files_struct *fsp, const char *name)
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{
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SMB_STRUCT_STAT sbuf;
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struct file_id id;
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struct db_context *db;
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int ret;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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if (SMB_VFS_NEXT_FSTAT(handle, fsp, &sbuf) == -1) {
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TALLOC_FREE(frame);
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return -1;
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}
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id = SMB_VFS_NEXT_FILE_ID_CREATE(handle, &sbuf);
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ret = xattr_tdb_removeattr(db, &id, name);
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TALLOC_FREE(frame);
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return ret;
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}
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/*
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* Open the tdb file upon VFS_CONNECT
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*/
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static bool xattr_tdb_init(int snum, TALLOC_CTX *mem_ctx, struct db_context **p_db)
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{
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struct db_context *db;
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const char *dbname;
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char *def_dbname;
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def_dbname = state_path(talloc_tos(), "xattr.tdb");
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if (def_dbname == NULL) {
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errno = ENOSYS;
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return false;
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}
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dbname = lp_parm_const_string(snum, "xattr_tdb", "file", def_dbname);
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/* now we know dbname is not NULL */
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become_root();
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db = db_open(NULL, dbname, 0, TDB_DEFAULT, O_RDWR|O_CREAT, 0600,
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DBWRAP_LOCK_ORDER_2, DBWRAP_FLAG_NONE);
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unbecome_root();
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if (db == NULL) {
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#if defined(ENOTSUP)
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errno = ENOTSUP;
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#else
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errno = ENOSYS;
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#endif
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TALLOC_FREE(def_dbname);
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return false;
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}
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*p_db = db;
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TALLOC_FREE(def_dbname);
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return true;
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}
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static int xattr_tdb_openat(struct vfs_handle_struct *handle,
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const struct files_struct *dirfsp,
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const struct smb_filename *smb_fname,
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struct files_struct *fsp,
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int flags,
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mode_t mode)
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{
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struct db_context *db = NULL;
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TALLOC_CTX *frame = NULL;
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SMB_STRUCT_STAT sbuf;
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int fd;
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int ret;
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fd = SMB_VFS_NEXT_OPENAT(handle,
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dirfsp,
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smb_fname,
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fsp,
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flags,
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mode);
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if (fd == -1) {
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return -1;
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}
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if ((flags & (O_CREAT|O_EXCL)) != (O_CREAT|O_EXCL)) {
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return fd;
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}
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/*
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* We know we used O_CREAT|O_EXCL and it worked.
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* We must have created the file.
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*/
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fsp_set_fd(fsp, fd);
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ret = SMB_VFS_FSTAT(fsp, &sbuf);
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fsp_set_fd(fsp, -1);
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if (ret == -1) {
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/* Can't happen... */
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DBG_WARNING("SMB_VFS_FSTAT failed on file %s (%s)\n",
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smb_fname_str_dbg(smb_fname),
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strerror(errno));
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return -1;
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}
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fsp->file_id = SMB_VFS_FILE_ID_CREATE(fsp->conn, &sbuf);
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frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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xattr_tdb_remove_all_attrs(db, &fsp->file_id);
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TALLOC_FREE(frame);
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return fd;
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}
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static int xattr_tdb_mkdirat(vfs_handle_struct *handle,
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struct files_struct *dirfsp,
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const struct smb_filename *smb_fname,
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mode_t mode)
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{
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struct db_context *db = NULL;
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TALLOC_CTX *frame = NULL;
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struct file_id fileid;
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int ret;
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struct smb_filename *full_fname = NULL;
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ret = SMB_VFS_NEXT_MKDIRAT(handle,
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dirfsp,
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smb_fname,
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mode);
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if (ret < 0) {
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return ret;
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}
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frame = talloc_stackframe();
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full_fname = full_path_from_dirfsp_atname(talloc_tos(),
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dirfsp,
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smb_fname);
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if (full_fname == NULL) {
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errno = ENOMEM;
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return -1;
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}
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/* Always use LSTAT here - we just created the directory. */
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ret = SMB_VFS_LSTAT(handle->conn, full_fname);
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if (ret == -1) {
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/* Rename race. Let upper level take care of it. */
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TALLOC_FREE(frame);
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return -1;
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}
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if (!S_ISDIR(full_fname->st.st_ex_mode)) {
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/* Rename race. Let upper level take care of it. */
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TALLOC_FREE(frame);
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return -1;
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}
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fileid = SMB_VFS_FILE_ID_CREATE(handle->conn, &full_fname->st);
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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xattr_tdb_remove_all_attrs(db, &fileid);
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TALLOC_FREE(frame);
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return 0;
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}
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/*
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* On unlink we need to delete the tdb record
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*/
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static int xattr_tdb_unlinkat(vfs_handle_struct *handle,
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struct files_struct *dirfsp,
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const struct smb_filename *smb_fname,
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int flags)
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{
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struct smb_filename *smb_fname_tmp = NULL;
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struct smb_filename *full_fname = NULL;
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struct file_id id;
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struct db_context *db;
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int ret = -1;
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bool remove_record = false;
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TALLOC_CTX *frame = talloc_stackframe();
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SMB_VFS_HANDLE_GET_DATA(handle, db, struct db_context,
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if (!xattr_tdb_init(-1, frame, &db))
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{
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TALLOC_FREE(frame); return -1;
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});
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smb_fname_tmp = cp_smb_filename(frame, smb_fname);
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if (smb_fname_tmp == NULL) {
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TALLOC_FREE(frame);
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errno = ENOMEM;
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return -1;
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}
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/*
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* TODO: use SMB_VFS_STATX() once we have that
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*/
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full_fname = full_path_from_dirfsp_atname(frame,
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dirfsp,
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smb_fname);
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if (full_fname == NULL) {
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goto out;
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}
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if (full_fname->flags & SMB_FILENAME_POSIX_PATH) {
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ret = SMB_VFS_NEXT_LSTAT(handle, full_fname);
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} else {
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ret = SMB_VFS_NEXT_STAT(handle, full_fname);
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}
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if (ret == -1) {
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goto out;
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}
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smb_fname_tmp->st = full_fname->st;
|
|
|
|
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 = {
|
|
.getxattrat_send_fn = xattr_tdb_getxattrat_send,
|
|
.getxattrat_recv_fn = xattr_tdb_getxattrat_recv,
|
|
.fgetxattr_fn = xattr_tdb_fgetxattr,
|
|
.fsetxattr_fn = xattr_tdb_fsetxattr,
|
|
.flistxattr_fn = xattr_tdb_flistxattr,
|
|
.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);
|
|
}
|