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/*
* 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 },
{ "EBADF", EBADF },
{ "EINTR", EINTR },
};
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 ssize_t vfs_error_inject_pwrite(vfs_handle_struct *handle,
files_struct *fsp,
const void *data,
size_t n,
off_t offset)
{
int error;
error = inject_unix_error("pwrite", handle);
if (error != 0) {
errno = error;
return -1;
}
return SMB_VFS_NEXT_PWRITE(handle, fsp, data, n, offset);
}
static int vfs_error_inject_open(
struct vfs_handle_struct *handle,
struct smb_filename *smb_fname,
files_struct *fsp,
int flags,
mode_t mode)
{
int error = inject_unix_error("open", handle);
if (error != 0) {
errno = error;
return -1;
}
return SMB_VFS_NEXT_OPEN(handle, smb_fname, fsp, flags, mode);
}
static struct vfs_fn_pointers vfs_error_inject_fns = {
.chdir_fn = vfs_error_inject_chdir,
.pwrite_fn = vfs_error_inject_pwrite,
.open_fn = vfs_error_inject_open,
};
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);
}
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