diff options
Diffstat (limited to 'source3/modules/vfs_posix_eadb.c')
| -rw-r--r-- | source3/modules/vfs_posix_eadb.c | 450 |
1 files changed, 450 insertions, 0 deletions
diff --git a/source3/modules/vfs_posix_eadb.c b/source3/modules/vfs_posix_eadb.c new file mode 100644 index 0000000..b3e21b0 --- /dev/null +++ b/source3/modules/vfs_posix_eadb.c @@ -0,0 +1,450 @@ +/* + * 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.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_EQUAL(status, NT_STATUS_NOT_FOUND)) { + errno = ENOATTR; + return -1; + } + + 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_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_get_io_fd(fsp), 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_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_get_io_fd(fsp), 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_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_get_io_fd(fsp), 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_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_get_io_fd(fsp), 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_helpers()); + + become_root(); + db = tdb_wrap_open(NULL, eadb, 50000, + lpcfg_tdb_flags(lp_ctx, TDB_DEFAULT), + O_RDWR|O_CREAT, 0600); + + 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_internal(vfs_handle_struct *handle, + struct files_struct *dirfsp, + const struct smb_filename *smb_fname, + int flags) +{ + struct smb_filename *full_fname = NULL; + struct smb_filename *smb_fname_tmp = NULL; + int ret = -1; + + struct tdb_wrap *ea_tdb; + + SMB_VFS_HANDLE_GET_DATA(handle, ea_tdb, struct tdb_wrap, return -1); + + smb_fname_tmp = cp_smb_filename(talloc_tos(), smb_fname); + if (smb_fname_tmp == NULL) { + errno = ENOMEM; + return -1; + } + + /* + * TODO: use SMB_VFS_STATX() once we have that. + */ + + full_fname = full_path_from_dirfsp_atname(talloc_tos(), + dirfsp, + smb_fname); + if (full_fname == NULL) { + goto out; + } + + if (smb_fname->flags & SMB_FILENAME_POSIX_PATH) { + ret = SMB_VFS_NEXT_LSTAT(handle, full_fname); + } else { + ret = SMB_VFS_NEXT_STAT(handle, full_fname); + } + if (ret == -1) { + goto out; + } + smb_fname_tmp->st = full_fname->st; + + if (smb_fname_tmp->st.st_ex_nlink == 1) { + NTSTATUS status; + + /* 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, + full_fname->base_name, + -1); + if (!NT_STATUS_IS_OK(status)) { + tdb_transaction_cancel(ea_tdb->tdb); + ret = -1; + goto out; + } + } + + ret = SMB_VFS_NEXT_UNLINKAT(handle, + dirfsp, + smb_fname_tmp, + flags); + + 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); + TALLOC_FREE(full_fname); + return ret; +} + +/* + * On rmdir we need to delete the tdb record + */ +static int posix_eadb_rmdir_internal(vfs_handle_struct *handle, + struct files_struct *dirfsp, + const struct smb_filename *smb_fname) +{ + NTSTATUS status; + struct tdb_wrap *ea_tdb; + int ret; + struct smb_filename *full_fname = NULL; + + SMB_VFS_HANDLE_GET_DATA(handle, ea_tdb, struct tdb_wrap, return -1); + + full_fname = full_path_from_dirfsp_atname(talloc_tos(), + dirfsp, + smb_fname); + if (full_fname == NULL) { + return -1; + } + + if (tdb_transaction_start(ea_tdb->tdb) != 0) { + TALLOC_FREE(full_fname); + return -1; + } + + status = unlink_posix_eadb_raw(ea_tdb, full_fname->base_name, -1); + TALLOC_FREE(full_fname); + if (!NT_STATUS_IS_OK(status)) { + tdb_transaction_cancel(ea_tdb->tdb); + } + + ret = SMB_VFS_NEXT_UNLINKAT(handle, + dirfsp, + smb_fname, + AT_REMOVEDIR); + + if (ret == -1) { + tdb_transaction_cancel(ea_tdb->tdb); + } else { + if (tdb_transaction_commit(ea_tdb->tdb) != 0) { + return -1; + } + } + + return ret; +} + +static int posix_eadb_unlinkat(vfs_handle_struct *handle, + struct files_struct *dirfsp, + const struct smb_filename *smb_fname, + int flags) +{ + int ret; + + if (flags & AT_REMOVEDIR) { + ret = posix_eadb_rmdir_internal(handle, + dirfsp, + smb_fname); + } else { + ret = posix_eadb_unlink_internal(handle, + dirfsp, + smb_fname, + flags); + } + 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 = { + .getxattrat_send_fn = vfs_not_implemented_getxattrat_send, + .getxattrat_recv_fn = vfs_not_implemented_getxattrat_recv, + .fgetxattr_fn = posix_eadb_fgetxattr, + .fsetxattr_fn = posix_eadb_fsetxattr, + .flistxattr_fn = posix_eadb_flistxattr, + .fremovexattr_fn = posix_eadb_fremovexattr, + .unlinkat_fn = posix_eadb_unlinkat, + .connect_fn = posix_eadb_connect, +}; + +static_decl_vfs; +NTSTATUS vfs_posix_eadb_init(TALLOC_CTX *ctx) +{ + return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "posix_eadb", + &vfs_posix_eadb_fns); +} |