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This module allow injecting errors in vfs calls. It only implements one case (return ESTALE from chdir), but the idea is to extend this to more vfs functions and more errors when needed. BUG: https://bugzilla.samba.org/show_bug.cgi?id=13189 Signed-off-by: Christof Schmitt <cs@samba.org> Signed-off-by: Andrew Bartlett <abartlet@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
101 lines
2.4 KiB
C
101 lines
2.4 KiB
C
/*
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* Unix SMB/CIFS implementation.
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* Samba VFS module for error injection in VFS calls
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* Copyright (C) Christof Schmitt 2017
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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 "includes.h"
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#include "smbd/smbd.h"
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#undef DBGC_CLASS
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#define DBGC_CLASS DBGC_VFS
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struct unix_error_map {
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const char *err_str;
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int error;
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} unix_error_map_array[] = {
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{ "ESTALE", ESTALE },
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};
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static int find_unix_error_from_string(const char *err_str)
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{
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int i;
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for (i = 0; i < ARRAY_SIZE(unix_error_map_array); i++) {
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struct unix_error_map *m = &unix_error_map_array[i];
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if (strequal(err_str, m->err_str)) {
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return m->error;
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}
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}
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return 0;
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}
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static int inject_unix_error(const char *vfs_func, vfs_handle_struct *handle)
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{
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const char *err_str;
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err_str = lp_parm_const_string(SNUM(handle->conn),
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"error_inject", vfs_func, NULL);
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if (err_str != NULL) {
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int error;
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error = find_unix_error_from_string(err_str);
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if (error != 0) {
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DBG_WARNING("Returning error %s for VFS function %s\n",
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err_str, vfs_func);
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return error;
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}
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if (strequal(err_str, "panic")) {
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DBG_ERR("Panic in VFS function %s\n", vfs_func);
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smb_panic("error_inject");
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}
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DBG_ERR("Unknown error inject %s requested "
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"for vfs function %s\n", err_str, vfs_func);
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}
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return 0;
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}
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static int vfs_error_inject_chdir(vfs_handle_struct *handle,
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const struct smb_filename *smb_fname)
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{
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int error;
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error = inject_unix_error("chdir", handle);
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if (error != 0) {
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errno = error;
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return -1;
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}
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return SMB_VFS_NEXT_CHDIR(handle, smb_fname);
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}
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static struct vfs_fn_pointers vfs_error_inject_fns = {
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.chdir_fn = vfs_error_inject_chdir,
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};
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static_decl_vfs;
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NTSTATUS vfs_error_inject_init(TALLOC_CTX *ctx)
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{
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return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "error_inject",
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&vfs_error_inject_fns);
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}
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