+/*
+ * Store posix-level xattrs in a tdb (posix:eadb format)
+ *
+ * Copyright (C) Andrew Bartlett, 2011
+ *
+ * Based on vfs_xattr_tdb by
+ * Copyright (C) Volker Lendecke, 2007
+ *
+ * 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 "librpc/gen_ndr/xattr.h"
+#include "librpc/gen_ndr/ndr_xattr.h"
+#include "../librpc/gen_ndr/ndr_netlogon.h"
+#include "tdb_compat.h"
+#include "lib/tdb_wrap/tdb_wrap.h"
+#include "ntvfs/posix/posix_eadb.h"
+#include "param/param.h"
+#include "lib/param/loadparm.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_VFS
+
+/*
+ * Worker routine for getxattr and fgetxattr
+ */
+
+static ssize_t posix_eadb_getattr(struct tdb_wrap *db_ctx,
+ const char *fname, int fd,
+ const char *name, void *value, size_t size)
+{
+ ssize_t result = -1;
+ NTSTATUS status;
+ DATA_BLOB blob;
+
+ DEBUG(10, ("posix_eadb_getattr called for file %s/fd %d, name %s\n",
+ fname, fd, name));
+
+ status = pull_xattr_blob_tdb_raw(db_ctx, talloc_tos(), name, fname, fd, size, &blob);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("posix_eadb_fetch_attrs failed: %s\n",
+ nt_errstr(status)));
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (blob.length > size) {
+ errno = ERANGE;
+ goto fail;
+ }
+
+ memcpy(value, blob.data, blob.length);
+ result = blob.length;
+
+ fail:
+ return result;
+}
+
+static ssize_t posix_eadb_getxattr(struct vfs_handle_struct *handle,
+ const char *path, const char *name,
+ void *value, size_t size)
+{
+ struct tdb_wrap *db;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, db, struct tdb_wrap, return -1);
+
+ return posix_eadb_getattr(db, path, -1, name, value, size);
+}
+
+static ssize_t posix_eadb_fgetxattr(struct vfs_handle_struct *handle,
+ struct files_struct *fsp,
+ const char *name, void *value, size_t size)
+{
+ struct tdb_wrap *db;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, db, struct tdb_wrap, return -1);
+
+ return posix_eadb_getattr(db, fsp->fsp_name->base_name, fsp->fh->fd, name, value, size);
+}
+
+/*
+ * Worker routine for setxattr and fsetxattr
+ */
+
+static int posix_eadb_setattr(struct tdb_wrap *db_ctx,
+ const char *fname, int fd, const char *name,
+ const void *value, size_t size, int flags)
+{
+ NTSTATUS status;
+ DATA_BLOB data = data_blob_const(value, size);
+
+ DEBUG(10, ("posix_eadb_setattr called for file %s/fd %d, name %s\n",
+ fname, fd, name));
+
+ status = push_xattr_blob_tdb_raw(db_ctx, name, fname, fd, &data);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("push_xattr_blob_tdb_raw failed: %s\n",
+ nt_errstr(status)));
+ return -1;
+ }
+
+ return 0;
+}
+
+static int posix_eadb_setxattr(struct vfs_handle_struct *handle,
+ const char *path, const char *name,
+ const void *value, size_t size, int flags)
+{
+ struct tdb_wrap *db;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, db, struct tdb_wrap, return -1);
+
+ return posix_eadb_setattr(db, path, -1, name, value, size, flags);
+}
+
+static int posix_eadb_fsetxattr(struct vfs_handle_struct *handle,
+ struct files_struct *fsp,
+ const char *name, const void *value,
+ size_t size, int flags)
+{
+ struct tdb_wrap *db;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, db, struct tdb_wrap, return -1);
+
+ return posix_eadb_setattr(db, fsp->fsp_name->base_name, fsp->fh->fd, name, value, size, flags);
+}
+
+/*
+ * Worker routine for listxattr and flistxattr
+ */
+
+static ssize_t posix_eadb_listattr(struct tdb_wrap *db_ctx,
+ const char *fname, int fd, char *list,
+ size_t size)
+{
+ DATA_BLOB blob;
+ NTSTATUS status;
+
+ status = list_posix_eadb_raw(db_ctx, talloc_tos(), fname, fd, &blob);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("posix_eadb_fetch_attrs failed: %s\n",
+ nt_errstr(status)));
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (blob.length > size) {
+ errno = ERANGE;
+ TALLOC_FREE(blob.data);
+ return -1;
+ }
+
+ memcpy(list, blob.data, blob.length);
+
+ TALLOC_FREE(blob.data);
+ return blob.length;
+}
+
+static ssize_t posix_eadb_listxattr(struct vfs_handle_struct *handle,
+ const char *path, char *list, size_t size)
+{
+ struct tdb_wrap *db;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, db, struct tdb_wrap, return -1);
+
+ return posix_eadb_listattr(db, path, -1, list, size);
+}
+
+static ssize_t posix_eadb_flistxattr(struct vfs_handle_struct *handle,
+ struct files_struct *fsp, char *list,
+ size_t size)
+{
+ struct tdb_wrap *db;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, db, struct tdb_wrap, return -1);
+
+ return posix_eadb_listattr(db, fsp->fsp_name->base_name, fsp->fh->fd, list, size);
+}
+
+/*
+ * Worker routine for removexattr and fremovexattr
+ */
+
+static int posix_eadb_removeattr(struct tdb_wrap *db_ctx,
+ const char *fname, int fd, const char *name)
+{
+ NTSTATUS status;
+
+ status = delete_posix_eadb_raw(db_ctx, name, fname, fd);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("delete_posix_eadb_raw failed: %s\n",
+ nt_errstr(status)));
+ return -1;
+ }
+ return 0;
+}
+
+static int posix_eadb_removexattr(struct vfs_handle_struct *handle,
+ const char *path, const char *name)
+{
+ struct tdb_wrap *db;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, db, struct tdb_wrap, return -1);
+
+ return posix_eadb_removeattr(db, path, -1, name);
+}
+
+static int posix_eadb_fremovexattr(struct vfs_handle_struct *handle,
+ struct files_struct *fsp, const char *name)
+{
+ struct tdb_wrap *db;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, db, struct tdb_wrap, return -1);
+
+ return posix_eadb_removeattr(db, fsp->fsp_name->base_name, fsp->fh->fd, name);
+}
+
+/*
+ * Open the tdb file upon VFS_CONNECT
+ */
+
+static bool posix_eadb_init(int snum, struct tdb_wrap **p_db)
+{
+ struct tdb_wrap *db;
+ struct loadparm_context *lp_ctx;
+ const char *eadb = lp_parm_const_string(snum, "posix", "eadb", NULL);
+
+ if (!eadb) {
+ DEBUG(0, ("Can not use vfs_posix_eadb without posix:eadb set\n"));
+ return false;
+ }
+
+ lp_ctx = loadparm_init_s3(NULL, loadparm_s3_context());
+
+ become_root();
+ db = tdb_wrap_open(NULL, eadb, 50000,
+ TDB_DEFAULT, O_RDWR|O_CREAT, 0600,
+ lp_ctx);
+
+ unbecome_root();
+ talloc_unlink(NULL, lp_ctx);
+ /* now we know dbname is not NULL */
+
+ if (db == NULL) {
+#if defined(ENOTSUP)
+ errno = ENOTSUP;
+#else
+ errno = ENOSYS;
+#endif
+ return false;
+ }
+
+ *p_db = db;
+ return true;
+}
+
+/*
+ * On unlink we need to delete the tdb record
+ */
+static int posix_eadb_unlink(vfs_handle_struct *handle,
+ const struct smb_filename *smb_fname)
+{
+ struct smb_filename *smb_fname_tmp = NULL;
+ NTSTATUS status;
+ int ret = -1;
+
+ struct tdb_wrap *ea_tdb;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, ea_tdb, struct tdb_wrap, return -1);
+
+ status = copy_smb_filename(talloc_tos(), smb_fname, &smb_fname_tmp);
+ if (!NT_STATUS_IS_OK(status)) {
+ errno = map_errno_from_nt_status(status);
+ return -1;
+ }
+
+ if (lp_posix_pathnames()) {
+ ret = SMB_VFS_LSTAT(handle->conn, smb_fname_tmp);
+ } else {
+ ret = SMB_VFS_STAT(handle->conn, smb_fname_tmp);
+ }
+ if (ret == -1) {
+ goto out;
+ }
+
+ if (smb_fname_tmp->st.st_ex_nlink == 1) {
+ /* Only remove record on last link to file. */
+
+ if (tdb_transaction_start(ea_tdb->tdb) != 0) {
+ ret = -1;
+ goto out;
+ }
+
+ status = unlink_posix_eadb_raw(ea_tdb, smb_fname->base_name, -1);
+ if (!NT_STATUS_IS_OK(status)) {
+ tdb_transaction_cancel(ea_tdb->tdb);
+ ret = -1;
+ goto out;
+ }
+ }
+
+ ret = SMB_VFS_NEXT_UNLINK(handle, smb_fname_tmp);
+
+ if (ret == -1) {
+ tdb_transaction_cancel(ea_tdb->tdb);
+ goto out;
+ } else {
+ if (tdb_transaction_commit(ea_tdb->tdb) != 0) {
+ ret = -1;
+ goto out;
+ }
+ }
+
+out:
+ TALLOC_FREE(smb_fname_tmp);
+ return ret;
+}
+
+/*
+ * On rmdir we need to delete the tdb record
+ */
+static int posix_eadb_rmdir(vfs_handle_struct *handle, const char *path)
+{
+ NTSTATUS status;
+ struct tdb_wrap *ea_tdb;
+ int ret;
+
+ SMB_VFS_HANDLE_GET_DATA(handle, ea_tdb, struct tdb_wrap, return -1);
+
+ if (tdb_transaction_start(ea_tdb->tdb) != 0) {
+ return -1;
+ }
+
+ status = unlink_posix_eadb_raw(ea_tdb, path, -1);
+ if (!NT_STATUS_IS_OK(status)) {
+ tdb_transaction_cancel(ea_tdb->tdb);
+ }
+
+ ret = SMB_VFS_NEXT_RMDIR(handle, path);
+
+ if (ret == -1) {
+ tdb_transaction_cancel(ea_tdb->tdb);
+ } else {
+ if (tdb_transaction_commit(ea_tdb->tdb) != 0) {
+ return -1;
+ }
+ }
+
+ return ret;
+}
+
+/*
+ * Destructor for the VFS private data
+ */
+
+static void close_xattr_db(void **data)
+{
+ struct tdb_wrap **p_db = (struct tdb_wrap **)data;
+ TALLOC_FREE(*p_db);
+}
+
+static int posix_eadb_connect(vfs_handle_struct *handle, const char *service,
+ const char *user)
+{
+ char *sname = NULL;
+ int res, snum;
+ struct tdb_wrap *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 (!posix_eadb_init(snum, &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 tdb_wrap, return -1);
+
+ return 0;
+}
+
+static struct vfs_fn_pointers vfs_posix_eadb_fns = {
+ .getxattr_fn = posix_eadb_getxattr,
+ .fgetxattr_fn = posix_eadb_fgetxattr,
+ .setxattr_fn = posix_eadb_setxattr,
+ .fsetxattr_fn = posix_eadb_fsetxattr,
+ .listxattr_fn = posix_eadb_listxattr,
+ .flistxattr_fn = posix_eadb_flistxattr,
+ .removexattr_fn = posix_eadb_removexattr,
+ .fremovexattr_fn = posix_eadb_fremovexattr,
+ .unlink_fn = posix_eadb_unlink,
+ .rmdir_fn = posix_eadb_rmdir,
+ .connect_fn = posix_eadb_connect,
+};
+
+NTSTATUS vfs_posix_eadb_init(void);
+NTSTATUS vfs_posix_eadb_init(void)
+{
+ return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posix_eadb",
+ &vfs_posix_eadb_fns);
+}
git.samba.org / ab / samba.git / .git / blobdiff