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samba-mirror/source3/modules/vfs_delay_inject.c

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/*
* Unix SMB/CIFS implementation.
* Samba VFS module for delay injection in VFS calls
* Copyright (C) Ralph Boehme 2018
*
* 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"
#include "lib/util/tevent_unix.h"
#undef DBGC_CLASS
#define DBGC_CLASS DBGC_VFS
static void inject_delay(const char *vfs_func, vfs_handle_struct *handle)
{
int delay;
delay = lp_parm_int(SNUM(handle->conn), "delay_inject", vfs_func, 0);
if (delay == 0) {
return;
}
DBG_DEBUG("Injected delay for [%s] of [%d] ms\n", vfs_func, delay);
smb_msleep(delay);
}
static int vfs_delay_inject_ntimes(vfs_handle_struct *handle,
const struct smb_filename *smb_fname,
struct smb_file_time *ft)
{
inject_delay("ntimes", handle);
return SMB_VFS_NEXT_NTIMES(handle, smb_fname, ft);
}
struct vfs_delay_inject_pread_state {
struct tevent_context *ev;
struct vfs_handle_struct *handle;
struct files_struct *fsp;
void *data;
size_t n;
off_t offset;
ssize_t ret;
struct vfs_aio_state vfs_aio_state;
};
static void vfs_delay_inject_pread_wait_done(struct tevent_req *subreq);
static void vfs_delay_inject_pread_done(struct tevent_req *subreq);
static struct tevent_req *vfs_delay_inject_pread_send(
struct vfs_handle_struct *handle,
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct files_struct *fsp,
void *data,
size_t n,
off_t offset)
{
struct tevent_req *req = NULL, *subreq = NULL;
struct vfs_delay_inject_pread_state *state = NULL;
int delay;
struct timeval delay_tv;
delay = lp_parm_int(
SNUM(handle->conn), "delay_inject", "pread_send", 0);
delay_tv = tevent_timeval_current_ofs(delay / 1000,
(delay * 1000) % 1000000);
req = tevent_req_create(mem_ctx, &state,
struct vfs_delay_inject_pread_state);
if (req == NULL) {
return NULL;
}
*state = (struct vfs_delay_inject_pread_state) {
.ev = ev,
.handle = handle,
.fsp = fsp,
.data = data,
.n = n,
.offset = offset,
};
if (delay == 0) {
subreq = SMB_VFS_NEXT_PREAD_SEND(state,
state->ev,
state->handle,
state->fsp,
state->data,
state->n,
state->offset);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq,
vfs_delay_inject_pread_done,
req);
return req;
}
subreq = tevent_wakeup_send(state, ev, delay_tv);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq, vfs_delay_inject_pread_wait_done, req);
return req;
}
static void vfs_delay_inject_pread_wait_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct vfs_delay_inject_pread_state *state = tevent_req_data(
req, struct vfs_delay_inject_pread_state);
bool ok;
ok = tevent_wakeup_recv(subreq);
TALLOC_FREE(subreq);
if (!ok) {
tevent_req_error(req, EIO);
return;
}
subreq = SMB_VFS_NEXT_PREAD_SEND(state,
state->ev,
state->handle,
state->fsp,
state->data,
state->n,
state->offset);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, vfs_delay_inject_pread_done, req);
}
static void vfs_delay_inject_pread_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct vfs_delay_inject_pread_state *state = tevent_req_data(
req, struct vfs_delay_inject_pread_state);
state->ret = SMB_VFS_PREAD_RECV(subreq, &state->vfs_aio_state);
TALLOC_FREE(subreq);
tevent_req_done(req);
}
static ssize_t vfs_delay_inject_pread_recv(struct tevent_req *req,
struct vfs_aio_state *vfs_aio_state)
{
struct vfs_delay_inject_pread_state *state = tevent_req_data(
req, struct vfs_delay_inject_pread_state);
if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
return -1;
}
*vfs_aio_state = state->vfs_aio_state;
return state->ret;
}
struct vfs_delay_inject_pwrite_state {
struct tevent_context *ev;
struct vfs_handle_struct *handle;
struct files_struct *fsp;
const void *data;
size_t n;
off_t offset;
ssize_t ret;
struct vfs_aio_state vfs_aio_state;
};
static void vfs_delay_inject_pwrite_wait_done(struct tevent_req *subreq);
static void vfs_delay_inject_pwrite_done(struct tevent_req *subreq);
static struct tevent_req *vfs_delay_inject_pwrite_send(
struct vfs_handle_struct *handle,
TALLOC_CTX *mem_ctx,
struct tevent_context *ev,
struct files_struct *fsp,
const void *data,
size_t n,
off_t offset)
{
struct tevent_req *req = NULL, *subreq = NULL;
struct vfs_delay_inject_pwrite_state *state = NULL;
int delay;
struct timeval delay_tv;
delay = lp_parm_int(
SNUM(handle->conn), "delay_inject", "pwrite_send", 0);
delay_tv = tevent_timeval_current_ofs(delay / 1000,
(delay * 1000) % 1000000);
req = tevent_req_create(mem_ctx, &state,
struct vfs_delay_inject_pwrite_state);
if (req == NULL) {
return NULL;
}
*state = (struct vfs_delay_inject_pwrite_state) {
.ev = ev,
.handle = handle,
.fsp = fsp,
.data = data,
.n = n,
.offset = offset,
};
if (delay == 0) {
subreq = SMB_VFS_NEXT_PWRITE_SEND(state,
state->ev,
state->handle,
state->fsp,
state->data,
state->n,
state->offset);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(subreq,
vfs_delay_inject_pwrite_done,
req);
return req;
}
subreq = tevent_wakeup_send(state, ev, delay_tv);
if (tevent_req_nomem(subreq, req)) {
return tevent_req_post(req, ev);
}
tevent_req_set_callback(
subreq, vfs_delay_inject_pwrite_wait_done, req);
return req;
}
static void vfs_delay_inject_pwrite_wait_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct vfs_delay_inject_pwrite_state *state = tevent_req_data(
req, struct vfs_delay_inject_pwrite_state);
bool ok;
ok = tevent_wakeup_recv(subreq);
TALLOC_FREE(subreq);
if (!ok) {
tevent_req_error(req, EIO);
return;
}
subreq = SMB_VFS_NEXT_PWRITE_SEND(state,
state->ev,
state->handle,
state->fsp,
state->data,
state->n,
state->offset);
if (tevent_req_nomem(subreq, req)) {
return;
}
tevent_req_set_callback(subreq, vfs_delay_inject_pwrite_done, req);
}
static void vfs_delay_inject_pwrite_done(struct tevent_req *subreq)
{
struct tevent_req *req = tevent_req_callback_data(
subreq, struct tevent_req);
struct vfs_delay_inject_pwrite_state *state = tevent_req_data(
req, struct vfs_delay_inject_pwrite_state);
state->ret = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
TALLOC_FREE(subreq);
tevent_req_done(req);
}
static ssize_t vfs_delay_inject_pwrite_recv(struct tevent_req *req,
struct vfs_aio_state *vfs_aio_state)
{
struct vfs_delay_inject_pwrite_state *state = tevent_req_data(
req, struct vfs_delay_inject_pwrite_state);
if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
return -1;
}
*vfs_aio_state = state->vfs_aio_state;
return state->ret;
}
static struct vfs_fn_pointers vfs_delay_inject_fns = {
.ntimes_fn = vfs_delay_inject_ntimes,
.pread_send_fn = vfs_delay_inject_pread_send,
.pread_recv_fn = vfs_delay_inject_pread_recv,
.pwrite_send_fn = vfs_delay_inject_pwrite_send,
.pwrite_recv_fn = vfs_delay_inject_pwrite_recv,
};
static_decl_vfs;
NTSTATUS vfs_delay_inject_init(TALLOC_CTX *ctx)
{
return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "delay_inject",
&vfs_delay_inject_fns);
}