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authorAndrew Bartlett <abartlet@samba.org>2012-04-16 15:49:13 +1000
committerAndrew Bartlett <abartlet@samba.org>2012-04-18 12:05:00 +1000
commit351c78fc670d5e26ebc2deea7ef930a94b116697 (patch)
treef036d2f027075dd30f8d3a32e7cccd33b69c7256 /source3/lib
parentce9676839b50ad34cead8f7f02488272a2bb3c85 (diff)
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s3-xattr_tdb: make xattr_tdb a private library, for use outside vfs_xattr_tdb
Diffstat (limited to 'source3/lib')
-rw-r--r--source3/lib/xattr_tdb.c455
-rw-r--r--source3/lib/xattr_tdb.h40
2 files changed, 495 insertions, 0 deletions
diff --git a/source3/lib/xattr_tdb.c b/source3/lib/xattr_tdb.c
new file mode 100644
index 0000000000..21223f04b8
--- /dev/null
+++ b/source3/lib/xattr_tdb.c
@@ -0,0 +1,455 @@
+/*
+ * Store posix-level xattrs in a tdb
+ *
+ * Copyright (C) Andrew Bartlett 2011
+ *
+ * extracted from 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 "librpc/gen_ndr/xattr.h"
+#include "librpc/gen_ndr/ndr_xattr.h"
+#include "librpc/gen_ndr/file_id.h"
+#include "dbwrap/dbwrap.h"
+#include "lib/util/util_tdb.h"
+#include "source3/lib/xattr_tdb.h"
+#include "source3/lib/file_id.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_VFS
+
+/*
+ * unmarshall tdb_xattrs
+ */
+
+static NTSTATUS xattr_tdb_pull_attrs(TALLOC_CTX *mem_ctx,
+ const TDB_DATA *data,
+ struct tdb_xattrs **presult)
+{
+ DATA_BLOB blob;
+ enum ndr_err_code ndr_err;
+ struct tdb_xattrs *result;
+
+ if (!(result = talloc_zero(mem_ctx, struct tdb_xattrs))) {
+ return NT_STATUS_NO_MEMORY;
+ }
+
+ if (data->dsize == 0) {
+ *presult = result;
+ return NT_STATUS_OK;
+ }
+
+ blob = data_blob_const(data->dptr, data->dsize);
+
+ ndr_err = ndr_pull_struct_blob(&blob, result, result,
+ (ndr_pull_flags_fn_t)ndr_pull_tdb_xattrs);
+
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ DEBUG(0, ("ndr_pull_tdb_xattrs failed: %s\n",
+ ndr_errstr(ndr_err)));
+ TALLOC_FREE(result);
+ return ndr_map_error2ntstatus(ndr_err);
+ }
+
+ *presult = result;
+ return NT_STATUS_OK;
+}
+
+/*
+ * marshall tdb_xattrs
+ */
+
+static NTSTATUS xattr_tdb_push_attrs(TALLOC_CTX *mem_ctx,
+ const struct tdb_xattrs *attribs,
+ TDB_DATA *data)
+{
+ DATA_BLOB blob;
+ enum ndr_err_code ndr_err;
+
+ ndr_err = ndr_push_struct_blob(&blob, mem_ctx, attribs,
+ (ndr_push_flags_fn_t)ndr_push_tdb_xattrs);
+
+ if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
+ DEBUG(0, ("ndr_push_tdb_xattrs failed: %s\n",
+ ndr_errstr(ndr_err)));
+ return ndr_map_error2ntstatus(ndr_err);
+ }
+
+ *data = make_tdb_data(blob.data, blob.length);
+ return NT_STATUS_OK;
+}
+
+/*
+ * Load tdb_xattrs for a file from the tdb
+ */
+
+static NTSTATUS xattr_tdb_load_attrs(TALLOC_CTX *mem_ctx,
+ struct db_context *db_ctx,
+ const struct file_id *id,
+ struct tdb_xattrs **presult)
+{
+ uint8_t id_buf[16];
+ NTSTATUS status;
+ TDB_DATA data;
+
+ /* For backwards compatibility only store the dev/inode. */
+ push_file_id_16((char *)id_buf, id);
+
+ status = dbwrap_fetch(db_ctx, mem_ctx,
+ make_tdb_data(id_buf, sizeof(id_buf)),
+ &data);
+ if (!NT_STATUS_IS_OK(status)) {
+ return NT_STATUS_INTERNAL_DB_CORRUPTION;
+ }
+
+ status = xattr_tdb_pull_attrs(mem_ctx, &data, presult);
+ TALLOC_FREE(data.dptr);
+ return status;
+}
+
+/*
+ * fetch_lock the tdb_ea record for a file
+ */
+
+static struct db_record *xattr_tdb_lock_attrs(TALLOC_CTX *mem_ctx,
+ struct db_context *db_ctx,
+ const struct file_id *id)
+{
+ uint8_t id_buf[16];
+
+ /* For backwards compatibility only store the dev/inode. */
+ push_file_id_16((char *)id_buf, id);
+ return dbwrap_fetch_locked(db_ctx, mem_ctx,
+ make_tdb_data(id_buf, sizeof(id_buf)));
+}
+
+/*
+ * Save tdb_xattrs to a previously fetch_locked record
+ */
+
+static NTSTATUS xattr_tdb_save_attrs(struct db_record *rec,
+ const struct tdb_xattrs *attribs)
+{
+ TDB_DATA data = tdb_null;
+ NTSTATUS status;
+
+ status = xattr_tdb_push_attrs(talloc_tos(), attribs, &data);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(0, ("xattr_tdb_push_attrs failed: %s\n",
+ nt_errstr(status)));
+ return status;
+ }
+
+ status = dbwrap_record_store(rec, data, 0);
+
+ TALLOC_FREE(data.dptr);
+
+ return status;
+}
+
+/*
+ * Worker routine for getxattr and fgetxattr
+ */
+
+ssize_t xattr_tdb_getattr(struct db_context *db_ctx,
+ const struct file_id *id,
+ const char *name, void *value, size_t size)
+{
+ struct tdb_xattrs *attribs;
+ uint32_t i;
+ ssize_t result = -1;
+ NTSTATUS status;
+
+ DEBUG(10, ("xattr_tdb_getattr called for file %s, name %s\n",
+ file_id_string_tos(id), name));
+
+ status = xattr_tdb_load_attrs(talloc_tos(), db_ctx, id, &attribs);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n",
+ nt_errstr(status)));
+ errno = EINVAL;
+ return -1;
+ }
+
+ for (i=0; i<attribs->num_eas; i++) {
+ if (strcmp(attribs->eas[i].name, name) == 0) {
+ break;
+ }
+ }
+
+ if (i == attribs->num_eas) {
+ errno = ENOATTR;
+ goto fail;
+ }
+
+ if (attribs->eas[i].value.length > size) {
+ errno = ERANGE;
+ goto fail;
+ }
+
+ memcpy(value, attribs->eas[i].value.data,
+ attribs->eas[i].value.length);
+ result = attribs->eas[i].value.length;
+
+ fail:
+ TALLOC_FREE(attribs);
+ return result;
+}
+
+/*
+ * Worker routine for setxattr and fsetxattr
+ */
+
+int xattr_tdb_setattr(struct db_context *db_ctx,
+ const struct file_id *id, const char *name,
+ const void *value, size_t size, int flags)
+{
+ NTSTATUS status;
+ struct db_record *rec;
+ struct tdb_xattrs *attribs;
+ uint32_t i;
+ TDB_DATA data;
+
+ DEBUG(10, ("xattr_tdb_setattr called for file %s, name %s\n",
+ file_id_string_tos(id), name));
+
+ rec = xattr_tdb_lock_attrs(talloc_tos(), db_ctx, id);
+
+ if (rec == NULL) {
+ DEBUG(0, ("xattr_tdb_lock_attrs failed\n"));
+ errno = EINVAL;
+ return -1;
+ }
+
+ data = dbwrap_record_get_value(rec);
+
+ status = xattr_tdb_pull_attrs(rec, &data, &attribs);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n",
+ nt_errstr(status)));
+ TALLOC_FREE(rec);
+ return -1;
+ }
+
+ for (i=0; i<attribs->num_eas; i++) {
+ if (strcmp(attribs->eas[i].name, name) == 0) {
+ if (flags & XATTR_CREATE) {
+ TALLOC_FREE(rec);
+ errno = EEXIST;
+ return -1;
+ }
+ break;
+ }
+ }
+
+ if (i == attribs->num_eas) {
+ struct xattr_EA *tmp;
+
+ if (flags & XATTR_REPLACE) {
+ TALLOC_FREE(rec);
+ errno = ENOATTR;
+ return -1;
+ }
+
+ tmp = talloc_realloc(
+ attribs, attribs->eas, struct xattr_EA,
+ attribs->num_eas+ 1);
+
+ if (tmp == NULL) {
+ DEBUG(0, ("talloc_realloc failed\n"));
+ TALLOC_FREE(rec);
+ errno = ENOMEM;
+ return -1;
+ }
+
+ attribs->eas = tmp;
+ attribs->num_eas += 1;
+ }
+
+ attribs->eas[i].name = name;
+ attribs->eas[i].value.data = discard_const_p(uint8_t, value);
+ attribs->eas[i].value.length = size;
+
+ status = xattr_tdb_save_attrs(rec, attribs);
+
+ TALLOC_FREE(rec);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, ("save failed: %s\n", nt_errstr(status)));
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * Worker routine for listxattr and flistxattr
+ */
+
+ssize_t xattr_tdb_listattr(struct db_context *db_ctx,
+ const struct file_id *id, char *list,
+ size_t size)
+{
+ NTSTATUS status;
+ struct tdb_xattrs *attribs;
+ uint32_t i;
+ size_t len = 0;
+
+ status = xattr_tdb_load_attrs(talloc_tos(), db_ctx, id, &attribs);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n",
+ nt_errstr(status)));
+ errno = EINVAL;
+ return -1;
+ }
+
+ DEBUG(10, ("xattr_tdb_listattr: Found %d xattrs\n",
+ attribs->num_eas));
+
+ for (i=0; i<attribs->num_eas; i++) {
+ size_t tmp;
+
+ DEBUG(10, ("xattr_tdb_listattr: xattrs[i].name: %s\n",
+ attribs->eas[i].name));
+
+ tmp = strlen(attribs->eas[i].name);
+
+ /*
+ * Try to protect against overflow
+ */
+
+ if (len + (tmp+1) < len) {
+ TALLOC_FREE(attribs);
+ errno = EINVAL;
+ return -1;
+ }
+
+ /*
+ * Take care of the terminating NULL
+ */
+ len += (tmp + 1);
+ }
+
+ if (len > size) {
+ TALLOC_FREE(attribs);
+ errno = ERANGE;
+ return len;
+ }
+
+ len = 0;
+
+ for (i=0; i<attribs->num_eas; i++) {
+ strlcpy(list+len, attribs->eas[i].name,
+ size-len);
+ len += (strlen(attribs->eas[i].name) + 1);
+ }
+
+ TALLOC_FREE(attribs);
+ return len;
+}
+
+/*
+ * Worker routine for removexattr and fremovexattr
+ */
+
+int xattr_tdb_removeattr(struct db_context *db_ctx,
+ const struct file_id *id, const char *name)
+{
+ NTSTATUS status;
+ struct db_record *rec;
+ struct tdb_xattrs *attribs;
+ uint32_t i;
+ TDB_DATA value;
+
+ rec = xattr_tdb_lock_attrs(talloc_tos(), db_ctx, id);
+
+ if (rec == NULL) {
+ DEBUG(0, ("xattr_tdb_lock_attrs failed\n"));
+ errno = EINVAL;
+ return -1;
+ }
+
+ value = dbwrap_record_get_value(rec);
+
+ status = xattr_tdb_pull_attrs(rec, &value, &attribs);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(10, ("xattr_tdb_fetch_attrs failed: %s\n",
+ nt_errstr(status)));
+ TALLOC_FREE(rec);
+ return -1;
+ }
+
+ for (i=0; i<attribs->num_eas; i++) {
+ if (strcmp(attribs->eas[i].name, name) == 0) {
+ break;
+ }
+ }
+
+ if (i == attribs->num_eas) {
+ TALLOC_FREE(rec);
+ errno = ENOATTR;
+ return -1;
+ }
+
+ attribs->eas[i] =
+ attribs->eas[attribs->num_eas-1];
+ attribs->num_eas -= 1;
+
+ if (attribs->num_eas == 0) {
+ dbwrap_record_delete(rec);
+ TALLOC_FREE(rec);
+ return 0;
+ }
+
+ status = xattr_tdb_save_attrs(rec, attribs);
+
+ TALLOC_FREE(rec);
+
+ if (!NT_STATUS_IS_OK(status)) {
+ DEBUG(1, ("save failed: %s\n", nt_errstr(status)));
+ return -1;
+ }
+
+ return 0;
+}
+
+/*
+ * Worker routine for unlink and rmdir
+ */
+
+void xattr_tdb_remove_all_attrs(struct db_context *db_ctx,
+ const struct file_id *id)
+{
+ struct db_record *rec;
+ rec = xattr_tdb_lock_attrs(talloc_tos(), db_ctx, id);
+
+ /*
+ * If rec == NULL there's not much we can do about it
+ */
+
+ if (rec != NULL) {
+ dbwrap_record_delete(rec);
+ TALLOC_FREE(rec);
+ }
+}
diff --git a/source3/lib/xattr_tdb.h b/source3/lib/xattr_tdb.h
new file mode 100644
index 0000000000..0a54833f51
--- /dev/null
+++ b/source3/lib/xattr_tdb.h
@@ -0,0 +1,40 @@
+/*
+ * Store posix-level xattrs in a tdb
+ *
+ * Copyright (C) Andrew Bartlett 2011
+ *
+ * extracted from 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 "librpc/gen_ndr/file_id.h"
+
+/* The following definitions come from lib/util/xattr_tdb.c */
+
+ssize_t xattr_tdb_getattr(struct db_context *db_ctx,
+ const struct file_id *id,
+ const char *name, void *value, size_t size);
+int xattr_tdb_setattr(struct db_context *db_ctx,
+ const struct file_id *id, const char *name,
+ const void *value, size_t size, int flags);
+ssize_t xattr_tdb_listattr(struct db_context *db_ctx,
+ const struct file_id *id, char *list,
+ size_t size);
+int xattr_tdb_removeattr(struct db_context *db_ctx,
+ const struct file_id *id, const char *name);
+void xattr_tdb_remove_all_attrs(struct db_context *db_ctx,
+ const struct file_id *id);