2 * Unix SMB/CIFS implementation.
3 * Samba VFS module for delay injection in VFS calls
4 * Copyright (C) Ralph Boehme 2018
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 3 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, see <http://www.gnu.org/licenses/>.
21 #include "locking/share_mode_lock.h"
22 #include "smbd/smbd.h"
23 #include "lib/util/tevent_unix.h"
24 #include "lib/global_contexts.h"
27 #define DBGC_CLASS DBGC_VFS
29 static void inject_delay(const char *vfs_func, vfs_handle_struct *handle)
33 delay = lp_parm_int(SNUM(handle->conn), "delay_inject", vfs_func, 0);
38 DBG_DEBUG("Injected delay for [%s] of [%d] ms\n", vfs_func, delay);
43 static int vfs_delay_inject_fntimes(vfs_handle_struct *handle,
45 struct smb_file_time *ft)
47 inject_delay("fntimes", handle);
49 return SMB_VFS_NEXT_FNTIMES(handle, fsp, ft);
52 struct vfs_delay_inject_pread_state {
53 struct tevent_context *ev;
54 struct vfs_handle_struct *handle;
55 struct files_struct *fsp;
60 struct vfs_aio_state vfs_aio_state;
63 static void vfs_delay_inject_pread_wait_done(struct tevent_req *subreq);
64 static void vfs_delay_inject_pread_done(struct tevent_req *subreq);
66 static struct tevent_req *vfs_delay_inject_pread_send(
67 struct vfs_handle_struct *handle,
69 struct tevent_context *ev,
70 struct files_struct *fsp,
75 struct tevent_req *req = NULL, *subreq = NULL;
76 struct vfs_delay_inject_pread_state *state = NULL;
78 struct timeval delay_tv;
81 SNUM(handle->conn), "delay_inject", "pread_send", 0);
82 delay_tv = tevent_timeval_current_ofs(delay / 1000,
83 (delay * 1000) % 1000000);
85 req = tevent_req_create(mem_ctx, &state,
86 struct vfs_delay_inject_pread_state);
90 *state = (struct vfs_delay_inject_pread_state) {
100 subreq = SMB_VFS_NEXT_PREAD_SEND(state,
107 if (tevent_req_nomem(subreq, req)) {
108 return tevent_req_post(req, ev);
110 tevent_req_set_callback(subreq,
111 vfs_delay_inject_pread_done,
116 subreq = tevent_wakeup_send(state, ev, delay_tv);
117 if (tevent_req_nomem(subreq, req)) {
118 return tevent_req_post(req, ev);
120 tevent_req_set_callback(subreq, vfs_delay_inject_pread_wait_done, req);
125 static void vfs_delay_inject_pread_wait_done(struct tevent_req *subreq)
127 struct tevent_req *req = tevent_req_callback_data(
128 subreq, struct tevent_req);
129 struct vfs_delay_inject_pread_state *state = tevent_req_data(
130 req, struct vfs_delay_inject_pread_state);
133 ok = tevent_wakeup_recv(subreq);
136 tevent_req_error(req, EIO);
140 subreq = SMB_VFS_NEXT_PREAD_SEND(state,
147 if (tevent_req_nomem(subreq, req)) {
150 tevent_req_set_callback(subreq, vfs_delay_inject_pread_done, req);
153 static void vfs_delay_inject_pread_done(struct tevent_req *subreq)
155 struct tevent_req *req = tevent_req_callback_data(
156 subreq, struct tevent_req);
157 struct vfs_delay_inject_pread_state *state = tevent_req_data(
158 req, struct vfs_delay_inject_pread_state);
160 state->ret = SMB_VFS_PREAD_RECV(subreq, &state->vfs_aio_state);
163 tevent_req_done(req);
166 static ssize_t vfs_delay_inject_pread_recv(struct tevent_req *req,
167 struct vfs_aio_state *vfs_aio_state)
169 struct vfs_delay_inject_pread_state *state = tevent_req_data(
170 req, struct vfs_delay_inject_pread_state);
172 if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
176 *vfs_aio_state = state->vfs_aio_state;
180 struct vfs_delay_inject_pwrite_state {
181 struct tevent_context *ev;
182 struct vfs_handle_struct *handle;
183 struct files_struct *fsp;
188 struct vfs_aio_state vfs_aio_state;
191 static void vfs_delay_inject_pwrite_wait_done(struct tevent_req *subreq);
192 static void vfs_delay_inject_pwrite_done(struct tevent_req *subreq);
194 static struct tevent_req *vfs_delay_inject_pwrite_send(
195 struct vfs_handle_struct *handle,
197 struct tevent_context *ev,
198 struct files_struct *fsp,
203 struct tevent_req *req = NULL, *subreq = NULL;
204 struct vfs_delay_inject_pwrite_state *state = NULL;
206 struct timeval delay_tv;
209 SNUM(handle->conn), "delay_inject", "pwrite_send", 0);
210 delay_tv = tevent_timeval_current_ofs(delay / 1000,
211 (delay * 1000) % 1000000);
213 req = tevent_req_create(mem_ctx, &state,
214 struct vfs_delay_inject_pwrite_state);
218 *state = (struct vfs_delay_inject_pwrite_state) {
228 subreq = SMB_VFS_NEXT_PWRITE_SEND(state,
235 if (tevent_req_nomem(subreq, req)) {
236 return tevent_req_post(req, ev);
238 tevent_req_set_callback(subreq,
239 vfs_delay_inject_pwrite_done,
244 subreq = tevent_wakeup_send(state, ev, delay_tv);
245 if (tevent_req_nomem(subreq, req)) {
246 return tevent_req_post(req, ev);
248 tevent_req_set_callback(
249 subreq, vfs_delay_inject_pwrite_wait_done, req);
254 static void vfs_delay_inject_pwrite_wait_done(struct tevent_req *subreq)
256 struct tevent_req *req = tevent_req_callback_data(
257 subreq, struct tevent_req);
258 struct vfs_delay_inject_pwrite_state *state = tevent_req_data(
259 req, struct vfs_delay_inject_pwrite_state);
262 ok = tevent_wakeup_recv(subreq);
265 tevent_req_error(req, EIO);
269 subreq = SMB_VFS_NEXT_PWRITE_SEND(state,
276 if (tevent_req_nomem(subreq, req)) {
279 tevent_req_set_callback(subreq, vfs_delay_inject_pwrite_done, req);
282 static void vfs_delay_inject_pwrite_done(struct tevent_req *subreq)
284 struct tevent_req *req = tevent_req_callback_data(
285 subreq, struct tevent_req);
286 struct vfs_delay_inject_pwrite_state *state = tevent_req_data(
287 req, struct vfs_delay_inject_pwrite_state);
289 state->ret = SMB_VFS_PWRITE_RECV(subreq, &state->vfs_aio_state);
292 tevent_req_done(req);
295 static ssize_t vfs_delay_inject_pwrite_recv(struct tevent_req *req,
296 struct vfs_aio_state *vfs_aio_state)
298 struct vfs_delay_inject_pwrite_state *state = tevent_req_data(
299 req, struct vfs_delay_inject_pwrite_state);
301 if (tevent_req_is_unix_error(req, &vfs_aio_state->error)) {
305 *vfs_aio_state = state->vfs_aio_state;
309 struct vfs_delay_inject_brl_lock_state {
310 struct vfs_delay_inject_brl_lock_state *prev, *next;
311 struct files_struct *fsp;
312 struct GUID req_guid;
313 struct timeval delay_tv;
314 struct tevent_timer *delay_te;
317 static struct vfs_delay_inject_brl_lock_state *brl_lock_states;
319 static int vfs_delay_inject_brl_lock_state_destructor(struct vfs_delay_inject_brl_lock_state *state)
321 DLIST_REMOVE(brl_lock_states, state);
325 static void vfs_delay_inject_brl_lock_timer(struct tevent_context *ev,
326 struct tevent_timer *te,
327 struct timeval current_time,
330 struct vfs_delay_inject_brl_lock_state *state =
331 talloc_get_type_abort(private_data,
332 struct vfs_delay_inject_brl_lock_state);
335 TALLOC_FREE(state->delay_te);
337 status = share_mode_wakeup_waiters(state->fsp->file_id);
338 if (!NT_STATUS_IS_OK(status)) {
339 struct file_id_buf idbuf;
340 DBG_ERR("share_mode_wakeup_waiters(%s) %s\n",
341 file_id_str_buf(state->fsp->file_id, &idbuf),
346 static NTSTATUS vfs_delay_inject_brl_lock_windows(struct vfs_handle_struct *handle,
347 struct byte_range_lock *br_lck,
348 struct lock_struct *plock)
350 struct files_struct *fsp = brl_fsp(br_lck);
351 TALLOC_CTX *req_mem_ctx = brl_req_mem_ctx(br_lck);
352 const struct GUID *req_guid = brl_req_guid(br_lck);
353 struct vfs_delay_inject_brl_lock_state *state = NULL;
356 for (state = brl_lock_states; state != NULL; state = state->next) {
359 match = GUID_equal(&state->req_guid, req_guid);
369 state = talloc_zero(req_mem_ctx,
370 struct vfs_delay_inject_brl_lock_state);
372 return NT_STATUS_NO_MEMORY;
375 state->req_guid = *req_guid;
377 delay = lp_parm_int(SNUM(handle->conn),
378 "delay_inject", "brl_lock_windows", 0);
379 state->delay_tv = timeval_current_ofs_msec(delay);
381 use_timer = lp_parm_bool(SNUM(handle->conn),
382 "delay_inject", "brl_lock_windows_use_timer", true);
385 state->delay_te = tevent_add_timer(
386 global_event_context(),
389 vfs_delay_inject_brl_lock_timer,
391 if (state->delay_te == NULL) {
392 return NT_STATUS_NO_MEMORY;
396 talloc_set_destructor(state,
397 vfs_delay_inject_brl_lock_state_destructor);
398 DLIST_ADD_END(brl_lock_states, state);
401 if (state->delay_te != NULL) {
402 plock->context.smblctx = 0;
403 return NT_STATUS_RETRY;
406 expired = timeval_expired(&state->delay_tv);
408 plock->context.smblctx = UINT64_MAX;
409 return NT_STATUS_RETRY;
414 return SMB_VFS_NEXT_BRL_LOCK_WINDOWS(handle, br_lck, plock);
417 static bool vfs_delay_inject_brl_unlock_windows(struct vfs_handle_struct *handle,
418 struct byte_range_lock *br_lck,
419 const struct lock_struct *plock)
421 return SMB_VFS_NEXT_BRL_UNLOCK_WINDOWS(handle, br_lck, plock);
424 static struct vfs_fn_pointers vfs_delay_inject_fns = {
425 .fntimes_fn = vfs_delay_inject_fntimes,
426 .pread_send_fn = vfs_delay_inject_pread_send,
427 .pread_recv_fn = vfs_delay_inject_pread_recv,
428 .pwrite_send_fn = vfs_delay_inject_pwrite_send,
429 .pwrite_recv_fn = vfs_delay_inject_pwrite_recv,
431 .brl_lock_windows_fn = vfs_delay_inject_brl_lock_windows,
432 .brl_unlock_windows_fn = vfs_delay_inject_brl_unlock_windows,
436 NTSTATUS vfs_delay_inject_init(TALLOC_CTX *ctx)
438 return smb_register_vfs(SMB_VFS_INTERFACE_VERSION, "delay_inject",
439 &vfs_delay_inject_fns);