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e58f03c91a
Autobuild-User: Volker Lendecke <vl@samba.org> Autobuild-Date: Thu Apr 19 19:13:45 CEST 2012 on sn-devel-104
457 lines
9.5 KiB
C
457 lines
9.5 KiB
C
/*
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* Store posix-level xattrs in a tdb
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*
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* Copyright (C) Andrew Bartlett 2011
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*
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* extracted from vfs_xattr_tdb by
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*
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* Copyright (C) Volker Lendecke, 2007
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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 "source3/include/includes.h"
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#include "system/filesys.h"
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#include "librpc/gen_ndr/xattr.h"
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#include "librpc/gen_ndr/ndr_xattr.h"
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#include "librpc/gen_ndr/file_id.h"
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#include "dbwrap/dbwrap.h"
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#include "lib/util/util_tdb.h"
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#include "source3/lib/xattr_tdb.h"
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#include "source3/lib/file_id.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_VFS
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/*
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* unmarshall tdb_xattrs
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*/
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static NTSTATUS xattr_tdb_pull_attrs(TALLOC_CTX *mem_ctx,
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const TDB_DATA *data,
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struct tdb_xattrs **presult)
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{
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DATA_BLOB blob;
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enum ndr_err_code ndr_err;
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struct tdb_xattrs *result;
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if (!(result = talloc_zero(mem_ctx, struct tdb_xattrs))) {
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return NT_STATUS_NO_MEMORY;
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}
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if (data->dsize == 0) {
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*presult = result;
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return NT_STATUS_OK;
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}
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blob = data_blob_const(data->dptr, data->dsize);
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ndr_err = ndr_pull_struct_blob(&blob, result, result,
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(ndr_pull_flags_fn_t)ndr_pull_tdb_xattrs);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(0, ("ndr_pull_tdb_xattrs failed: %s\n",
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ndr_errstr(ndr_err)));
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TALLOC_FREE(result);
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return ndr_map_error2ntstatus(ndr_err);
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}
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*presult = result;
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return NT_STATUS_OK;
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}
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/*
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* marshall tdb_xattrs
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*/
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static NTSTATUS xattr_tdb_push_attrs(TALLOC_CTX *mem_ctx,
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const struct tdb_xattrs *attribs,
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TDB_DATA *data)
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{
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DATA_BLOB blob;
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enum ndr_err_code ndr_err;
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ndr_err = ndr_push_struct_blob(&blob, mem_ctx, attribs,
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(ndr_push_flags_fn_t)ndr_push_tdb_xattrs);
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if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
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DEBUG(0, ("ndr_push_tdb_xattrs failed: %s\n",
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ndr_errstr(ndr_err)));
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return ndr_map_error2ntstatus(ndr_err);
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}
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*data = make_tdb_data(blob.data, blob.length);
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return NT_STATUS_OK;
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}
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/*
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* Load tdb_xattrs for a file from the tdb
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*/
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static NTSTATUS xattr_tdb_load_attrs(TALLOC_CTX *mem_ctx,
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struct db_context *db_ctx,
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const struct file_id *id,
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struct tdb_xattrs **presult)
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{
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uint8_t id_buf[16];
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NTSTATUS status;
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TDB_DATA data;
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/* For backwards compatibility only store the dev/inode. */
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push_file_id_16((char *)id_buf, id);
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status = dbwrap_fetch(db_ctx, mem_ctx,
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make_tdb_data(id_buf, sizeof(id_buf)),
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&data);
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if (!NT_STATUS_IS_OK(status)) {
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return NT_STATUS_INTERNAL_DB_CORRUPTION;
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}
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status = xattr_tdb_pull_attrs(mem_ctx, &data, presult);
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TALLOC_FREE(data.dptr);
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return status;
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}
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/*
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* fetch_lock the tdb_ea record for a file
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*/
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static struct db_record *xattr_tdb_lock_attrs(TALLOC_CTX *mem_ctx,
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struct db_context *db_ctx,
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const struct file_id *id)
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{
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uint8_t id_buf[16];
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/* For backwards compatibility only store the dev/inode. */
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push_file_id_16((char *)id_buf, id);
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return dbwrap_fetch_locked(db_ctx, mem_ctx,
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make_tdb_data(id_buf, sizeof(id_buf)));
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}
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/*
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* Save tdb_xattrs to a previously fetch_locked record
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*/
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static NTSTATUS xattr_tdb_save_attrs(struct db_record *rec,
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const struct tdb_xattrs *attribs)
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{
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TDB_DATA data = tdb_null;
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NTSTATUS status;
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status = xattr_tdb_push_attrs(talloc_tos(), attribs, &data);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(0, ("xattr_tdb_push_attrs failed: %s\n",
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nt_errstr(status)));
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return status;
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}
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status = dbwrap_record_store(rec, data, 0);
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TALLOC_FREE(data.dptr);
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return status;
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}
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/*
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* Worker routine for getxattr and fgetxattr
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*/
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ssize_t xattr_tdb_getattr(struct db_context *db_ctx,
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TALLOC_CTX *mem_ctx,
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const struct file_id *id,
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const char *name, DATA_BLOB *blob)
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{
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struct tdb_xattrs *attribs;
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uint32_t i;
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ssize_t result = -1;
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NTSTATUS status;
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TALLOC_CTX *frame = talloc_stackframe();
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DEBUG(10, ("xattr_tdb_getattr called for file %s, name %s\n",
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file_id_string(frame, id), name));
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status = xattr_tdb_load_attrs(frame, db_ctx, id, &attribs);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n",
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nt_errstr(status)));
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TALLOC_FREE(frame);
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errno = EINVAL;
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return -1;
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}
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for (i=0; i<attribs->num_eas; i++) {
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if (strcmp(attribs->eas[i].name, name) == 0) {
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break;
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}
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}
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if (i == attribs->num_eas) {
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errno = ENOATTR;
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goto fail;
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}
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*blob = attribs->eas[i].value;
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talloc_steal(mem_ctx, blob->data);
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result = attribs->eas[i].value.length;
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fail:
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TALLOC_FREE(frame);
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return result;
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}
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/*
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* Worker routine for setxattr and fsetxattr
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*/
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int xattr_tdb_setattr(struct db_context *db_ctx,
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const struct file_id *id, const char *name,
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const void *value, size_t size, int flags)
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{
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NTSTATUS status;
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struct db_record *rec;
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struct tdb_xattrs *attribs;
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uint32_t i;
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TDB_DATA data;
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TALLOC_CTX *frame = talloc_stackframe();
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DEBUG(10, ("xattr_tdb_setattr called for file %s, name %s\n",
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file_id_string(frame, id), name));
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rec = xattr_tdb_lock_attrs(frame, db_ctx, id);
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if (rec == NULL) {
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DEBUG(0, ("xattr_tdb_lock_attrs failed\n"));
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errno = EINVAL;
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return -1;
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}
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data = dbwrap_record_get_value(rec);
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status = xattr_tdb_pull_attrs(rec, &data, &attribs);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n",
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nt_errstr(status)));
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TALLOC_FREE(frame);
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return -1;
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}
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for (i=0; i<attribs->num_eas; i++) {
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if (strcmp(attribs->eas[i].name, name) == 0) {
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if (flags & XATTR_CREATE) {
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TALLOC_FREE(frame);
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errno = EEXIST;
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return -1;
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}
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break;
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}
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}
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if (i == attribs->num_eas) {
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struct xattr_EA *tmp;
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if (flags & XATTR_REPLACE) {
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TALLOC_FREE(frame);
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errno = ENOATTR;
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return -1;
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}
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tmp = talloc_realloc(
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attribs, attribs->eas, struct xattr_EA,
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attribs->num_eas+ 1);
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if (tmp == NULL) {
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DEBUG(0, ("talloc_realloc failed\n"));
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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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attribs->eas = tmp;
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attribs->num_eas += 1;
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}
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attribs->eas[i].name = name;
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attribs->eas[i].value.data = discard_const_p(uint8_t, value);
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attribs->eas[i].value.length = size;
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status = xattr_tdb_save_attrs(rec, attribs);
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TALLOC_FREE(frame);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("save failed: %s\n", nt_errstr(status)));
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return -1;
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}
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return 0;
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}
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/*
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* Worker routine for listxattr and flistxattr
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*/
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ssize_t xattr_tdb_listattr(struct db_context *db_ctx,
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const struct file_id *id, char *list,
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size_t size)
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{
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NTSTATUS status;
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struct tdb_xattrs *attribs;
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uint32_t i;
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size_t len = 0;
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TALLOC_CTX *frame = talloc_stackframe();
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status = xattr_tdb_load_attrs(frame, db_ctx, id, &attribs);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n",
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nt_errstr(status)));
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errno = EINVAL;
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TALLOC_FREE(frame);
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return -1;
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}
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DEBUG(10, ("xattr_tdb_listattr: Found %d xattrs\n",
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attribs->num_eas));
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for (i=0; i<attribs->num_eas; i++) {
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size_t tmp;
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DEBUG(10, ("xattr_tdb_listattr: xattrs[i].name: %s\n",
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attribs->eas[i].name));
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tmp = strlen(attribs->eas[i].name);
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/*
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* Try to protect against overflow
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*/
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if (len + (tmp+1) < len) {
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TALLOC_FREE(frame);
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errno = EINVAL;
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return -1;
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}
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/*
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* Take care of the terminating NULL
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*/
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len += (tmp + 1);
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}
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if (len > size) {
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TALLOC_FREE(frame);
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errno = ERANGE;
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return len;
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}
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len = 0;
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for (i=0; i<attribs->num_eas; i++) {
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strlcpy(list+len, attribs->eas[i].name,
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size-len);
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len += (strlen(attribs->eas[i].name) + 1);
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}
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TALLOC_FREE(frame);
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return len;
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}
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/*
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* Worker routine for removexattr and fremovexattr
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*/
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int xattr_tdb_removeattr(struct db_context *db_ctx,
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const struct file_id *id, const char *name)
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{
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NTSTATUS status;
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struct db_record *rec;
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struct tdb_xattrs *attribs;
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uint32_t i;
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TDB_DATA value;
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rec = xattr_tdb_lock_attrs(talloc_tos(), db_ctx, id);
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if (rec == NULL) {
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DEBUG(0, ("xattr_tdb_lock_attrs failed\n"));
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errno = EINVAL;
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return -1;
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}
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value = dbwrap_record_get_value(rec);
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status = xattr_tdb_pull_attrs(rec, &value, &attribs);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n",
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nt_errstr(status)));
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TALLOC_FREE(rec);
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return -1;
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}
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for (i=0; i<attribs->num_eas; i++) {
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if (strcmp(attribs->eas[i].name, name) == 0) {
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break;
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}
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}
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if (i == attribs->num_eas) {
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TALLOC_FREE(rec);
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errno = ENOATTR;
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return -1;
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}
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attribs->eas[i] =
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attribs->eas[attribs->num_eas-1];
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attribs->num_eas -= 1;
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if (attribs->num_eas == 0) {
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dbwrap_record_delete(rec);
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TALLOC_FREE(rec);
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return 0;
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}
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status = xattr_tdb_save_attrs(rec, attribs);
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TALLOC_FREE(rec);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1, ("save failed: %s\n", nt_errstr(status)));
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return -1;
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}
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return 0;
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}
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/*
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* Worker routine for unlink and rmdir
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*/
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void xattr_tdb_remove_all_attrs(struct db_context *db_ctx,
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const struct file_id *id)
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{
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struct db_record *rec;
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rec = xattr_tdb_lock_attrs(talloc_tos(), db_ctx, id);
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/*
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* If rec == NULL there's not much we can do about it
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*/
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if (rec != NULL) {
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dbwrap_record_delete(rec);
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TALLOC_FREE(rec);
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}
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}
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