--- /dev/null
+/*
+ * Unix SMB/CIFS implementation.
+ * Samba VFS module for error injection in VFS calls
+ * Copyright (C) Christof Schmitt 2017
+ *
+ * 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 "smbd/smbd.h"
+
+#undef DBGC_CLASS
+#define DBGC_CLASS DBGC_VFS
+
+struct unix_error_map {
+ const char *err_str;
+ int error;
+} unix_error_map_array[] = {
+ { "ESTALE", ESTALE },
+};
+
+static int find_unix_error_from_string(const char *err_str)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(unix_error_map_array); i++) {
+ struct unix_error_map *m = &unix_error_map_array[i];
+
+ if (strequal(err_str, m->err_str)) {
+ return m->error;
+ }
+ }
+
+ return 0;
+}
+
+static int inject_unix_error(const char *vfs_func, vfs_handle_struct *handle)
+{
+ const char *err_str;
+
+ err_str = lp_parm_const_string(SNUM(handle->conn),
+ "error_inject", vfs_func, NULL);
+
+ if (err_str != NULL) {
+ int error;
+
+ error = find_unix_error_from_string(err_str);
+ if (error != 0) {
+ DBG_WARNING("Returning error %s for VFS function %s\n",
+ err_str, vfs_func);
+ return error;
+ }
+
+ if (strequal(err_str, "panic")) {
+ DBG_ERR("Panic in VFS function %s\n", vfs_func);
+ smb_panic("error_inject");
+ }
+
+ DBG_ERR("Unknown error inject %s requested "
+ "for vfs function %s\n", err_str, vfs_func);
+ }
+
+ return 0;
+}
+
+static int vfs_error_inject_chdir(vfs_handle_struct *handle,
+ const struct smb_filename *smb_fname)
+{
+ int error;
+
+ error = inject_unix_error("chdir", handle);
+ if (error != 0) {
+ errno = error;
+ return -1;
+ }
+
+ return SMB_VFS_NEXT_CHDIR(handle, smb_fname);
+}
+
+static struct vfs_fn_pointers vfs_error_inject_fns = {
+ .chdir_fn = vfs_error_inject_chdir,
+};
+
+static_decl_vfs;
+NTSTATUS vfs_error_inject_init(TALLOC_CTX *ctx)
+{
+ return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "error_inject",
+ &vfs_error_inject_fns);
+}