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-rw-r--r--source3/modules/vfs_delay_inject.c440
1 files changed, 440 insertions, 0 deletions
diff --git a/source3/modules/vfs_delay_inject.c b/source3/modules/vfs_delay_inject.c
new file mode 100644
index 0000000..e0a881e
--- /dev/null
+++ b/source3/modules/vfs_delay_inject.c
@@ -0,0 +1,440 @@
+/*
+ * 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 "locking/share_mode_lock.h"
+#include "smbd/smbd.h"
+#include "lib/util/tevent_unix.h"
+#include "lib/global_contexts.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_fntimes(vfs_handle_struct *handle,
+ files_struct *fsp,
+ struct smb_file_time *ft)
+{
+ inject_delay("fntimes", handle);
+
+ return SMB_VFS_NEXT_FNTIMES(handle, fsp, 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;
+}
+
+struct vfs_delay_inject_brl_lock_state {
+ struct vfs_delay_inject_brl_lock_state *prev, *next;
+ struct files_struct *fsp;
+ struct GUID req_guid;
+ struct timeval delay_tv;
+ struct tevent_timer *delay_te;
+};
+
+static struct vfs_delay_inject_brl_lock_state *brl_lock_states;
+
+static int vfs_delay_inject_brl_lock_state_destructor(struct vfs_delay_inject_brl_lock_state *state)
+{
+ DLIST_REMOVE(brl_lock_states, state);
+ return 0;
+}
+
+static void vfs_delay_inject_brl_lock_timer(struct tevent_context *ev,
+ struct tevent_timer *te,
+ struct timeval current_time,
+ void *private_data)
+{
+ struct vfs_delay_inject_brl_lock_state *state =
+ talloc_get_type_abort(private_data,
+ struct vfs_delay_inject_brl_lock_state);
+ NTSTATUS status;
+
+ TALLOC_FREE(state->delay_te);
+
+ status = share_mode_wakeup_waiters(state->fsp->file_id);
+ if (!NT_STATUS_IS_OK(status)) {
+ struct file_id_buf idbuf;
+ DBG_ERR("share_mode_wakeup_waiters(%s) %s\n",
+ file_id_str_buf(state->fsp->file_id, &idbuf),
+ nt_errstr(status));
+ }
+}
+
+static NTSTATUS vfs_delay_inject_brl_lock_windows(struct vfs_handle_struct *handle,
+ struct byte_range_lock *br_lck,
+ struct lock_struct *plock)
+{
+ struct files_struct *fsp = brl_fsp(br_lck);
+ TALLOC_CTX *req_mem_ctx = brl_req_mem_ctx(br_lck);
+ const struct GUID *req_guid = brl_req_guid(br_lck);
+ struct vfs_delay_inject_brl_lock_state *state = NULL;
+ bool expired;
+
+ for (state = brl_lock_states; state != NULL; state = state->next) {
+ bool match;
+
+ match = GUID_equal(&state->req_guid, req_guid);
+ if (match) {
+ break;
+ }
+ }
+
+ if (state == NULL) {
+ int delay;
+ bool use_timer;
+
+ state = talloc_zero(req_mem_ctx,
+ struct vfs_delay_inject_brl_lock_state);
+ if (state == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ state->fsp = fsp;
+ state->req_guid = *req_guid;
+
+ delay = lp_parm_int(SNUM(handle->conn),
+ "delay_inject", "brl_lock_windows", 0);
+ state->delay_tv = timeval_current_ofs_msec(delay);
+
+ use_timer = lp_parm_bool(SNUM(handle->conn),
+ "delay_inject", "brl_lock_windows_use_timer", true);
+
+ if (use_timer) {
+ state->delay_te = tevent_add_timer(
+ global_event_context(),
+ state,
+ state->delay_tv,
+ vfs_delay_inject_brl_lock_timer,
+ state);
+ if (state->delay_te == NULL) {
+ return NT_STATUS_NO_MEMORY;
+ }
+ }
+
+ talloc_set_destructor(state,
+ vfs_delay_inject_brl_lock_state_destructor);
+ DLIST_ADD_END(brl_lock_states, state);
+ }
+
+ if (state->delay_te != NULL) {
+ plock->context.smblctx = 0;
+ return NT_STATUS_RETRY;
+ }
+
+ expired = timeval_expired(&state->delay_tv);
+ if (!expired) {
+ plock->context.smblctx = UINT64_MAX;
+ return NT_STATUS_RETRY;
+ }
+
+ TALLOC_FREE(state);
+
+ return SMB_VFS_NEXT_BRL_LOCK_WINDOWS(handle, br_lck, plock);
+}
+
+static bool vfs_delay_inject_brl_unlock_windows(struct vfs_handle_struct *handle,
+ struct byte_range_lock *br_lck,
+ const struct lock_struct *plock)
+{
+ return SMB_VFS_NEXT_BRL_UNLOCK_WINDOWS(handle, br_lck, plock);
+}
+
+static struct vfs_fn_pointers vfs_delay_inject_fns = {
+ .fntimes_fn = vfs_delay_inject_fntimes,
+ .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,
+
+ .brl_lock_windows_fn = vfs_delay_inject_brl_lock_windows,
+ .brl_unlock_windows_fn = vfs_delay_inject_brl_unlock_windows,
+};
+
+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);
+}