1 files changed, 270 insertions, 0 deletions
diff --git a/source3/smbd/notifyd/fcn_wait.c b/source3/smbd/notifyd/fcn_wait.c
new file mode 100644
index 0000000..e32240d
--- /dev/null
+++ b/source3/smbd/notifyd/fcn_wait.c
@@ -0,0 +1,270 @@
+/*
+ * 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 "replace.h"
+#include "fcn_wait.h"
+#include "notifyd.h"
+#include "lib/util/tevent_ntstatus.h"
+
+struct fcn_event {
+	struct fcn_event *prev, *next;
+	struct notify_event_msg msg;
+};
+
+struct fcn_wait_state {
+	struct tevent_context *ev;
+	struct messaging_context *msg_ctx;
+	struct server_id notifyd;
+	const char *path;
+
+	struct tevent_req *recv_subreq;
+
+	struct fcn_event *events;
+};
+
+static bool fcn_wait_cancel(struct tevent_req *req);
+static void fcn_wait_cleanup(
+	struct tevent_req *req, enum tevent_req_state req_state);
+static bool fcn_wait_filter(struct messaging_rec *rec, void *private_data);
+static void fcn_wait_done(struct tevent_req *subreq);
+
+struct tevent_req *fcn_wait_send(
+	TALLOC_CTX *mem_ctx,
+	struct tevent_context *ev,
+	struct messaging_context *msg_ctx,
+	struct server_id notifyd,
+	const char *path,
+	uint32_t filter,
+	uint32_t subdir_filter)
+{
+	struct tevent_req *req = NULL;
+	struct fcn_wait_state *state = NULL;
+	struct notify_rec_change_msg msg = {
+		.instance.filter = filter,
+		.instance.subdir_filter = subdir_filter,
+	};
+	struct iovec iov[2];
+	NTSTATUS status;
+
+	req = tevent_req_create(mem_ctx, &state, struct fcn_wait_state);
+	if (req == NULL) {
+		return NULL;
+	}
+	state->ev = ev;
+	state->msg_ctx = msg_ctx;
+	state->notifyd = notifyd;
+	state->path = path;
+
+	state->recv_subreq = messaging_filtered_read_send(
+		state, ev, msg_ctx, fcn_wait_filter, req);
+	if (tevent_req_nomem(state->recv_subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(state->recv_subreq, fcn_wait_done, req);
+	tevent_req_set_cleanup_fn(req, fcn_wait_cleanup);
+
+	clock_gettime_mono(&msg.instance.creation_time);
+	msg.instance.private_data = state;
+
+	iov[0].iov_base = &msg;
+	iov[0].iov_len = offsetof(struct notify_rec_change_msg, path);
+	iov[1].iov_base = discard_const_p(char, path);
+	iov[1].iov_len = strlen(path)+1;
+
+	status = messaging_send_iov(
+		msg_ctx,			/* msg_ctx */
+		notifyd,			/* dst */
+		MSG_SMB_NOTIFY_REC_CHANGE,	/* mst_type */
+		iov,				/* iov */
+		ARRAY_SIZE(iov),		/* iovlen */
+		NULL,				/* fds */
+		0);				/* num_fds */
+	if (tevent_req_nterror(req, status)) {
+		DBG_DEBUG("messaging_send_iov failed: %s\n",
+			  nt_errstr(status));
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_cancel_fn(req, fcn_wait_cancel);
+
+	return req;
+}
+
+static bool fcn_wait_cancel(struct tevent_req *req)
+{
+	struct fcn_wait_state *state = tevent_req_data(
+		req, struct fcn_wait_state);
+	struct notify_rec_change_msg msg = {
+		.instance.filter = 0, /* filter==0 is a delete msg */
+		.instance.subdir_filter = 0,
+	};
+	struct iovec iov[2];
+	NTSTATUS status;
+
+	clock_gettime_mono(&msg.instance.creation_time);
+	msg.instance.private_data = state;
+
+	iov[0].iov_base = &msg;
+	iov[0].iov_len = offsetof(struct notify_rec_change_msg, path);
+	iov[1].iov_base = discard_const_p(char, state->path);
+	iov[1].iov_len = strlen(state->path)+1;
+
+	status = messaging_send_iov(
+		state->msg_ctx,			/* msg_ctx */
+		state->notifyd,			/* dst */
+		MSG_SMB_NOTIFY_REC_CHANGE,	/* mst_type */
+		iov,				/* iov */
+		ARRAY_SIZE(iov),		/* iovlen */
+		NULL,				/* fds */
+		0);				/* num_fds */
+	if (!NT_STATUS_IS_OK(status)) {
+		DBG_DEBUG("messaging_send_iov failed: %s\n",
+			  nt_errstr(status));
+		return false;
+	}
+
+	fcn_wait_cleanup(req, 0); /* fcn_wait_cleanup ignores req_state */
+	tevent_req_defer_callback(req, state->ev);
+	tevent_req_nterror(req, NT_STATUS_CANCELLED);
+
+	return true;
+}
+
+static void fcn_wait_cleanup(
+	struct tevent_req *req, enum tevent_req_state req_state)
+{
+	struct fcn_wait_state *state = tevent_req_data(
+		req, struct fcn_wait_state);
+	TALLOC_FREE(state->recv_subreq);
+}
+
+static bool fcn_wait_filter(struct messaging_rec *rec, void *private_data)
+{
+	struct tevent_req *req = talloc_get_type_abort(
+		private_data, struct tevent_req);
+	struct fcn_wait_state *state = tevent_req_data(
+		req, struct fcn_wait_state);
+	struct notify_event_msg msg = { .action = 0 };
+	struct fcn_event *evt = NULL;
+
+	if (rec->msg_type != MSG_PVFS_NOTIFY) {
+		DBG_DEBUG("Ignoring msg %"PRIu32"\n", rec->msg_type);
+		return false;
+	}
+
+	/*
+	 * We need at least the trailing '\0' for the path
+	 */
+	if (rec->buf.length < (offsetof(struct notify_event_msg, path) + 1)) {
+		DBG_DEBUG("Ignoring short (%zu) msg\n", rec->buf.length);
+		return false;
+	}
+	if (rec->buf.data[rec->buf.length-1] != '\0') {
+		DBG_DEBUG("Expected 0-terminated path\n");
+		return false;
+	}
+
+	memcpy(&msg, rec->buf.data, sizeof(msg));
+
+	if (msg.private_data != state) {
+		DBG_DEBUG("Got private_data=%p, expected %p\n",
+			  msg.private_data,
+			  state);
+		return false;
+	}
+
+	evt = talloc_memdup(state, rec->buf.data, rec->buf.length);
+	if (evt == NULL) {
+		DBG_DEBUG("talloc_memdup failed\n");
+		return false;
+	}
+	talloc_set_name_const(evt, "struct fcn_event");
+
+	/*
+	 * TODO: Sort by timestamp
+	 */
+
+	DLIST_ADD_END(state->events, evt);
+
+	tevent_req_defer_callback(req, state->ev);
+	tevent_req_notify_callback(req);
+
+	return false;
+}
+
+static void fcn_wait_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	int ret;
+
+	ret = messaging_filtered_read_recv(subreq, NULL, NULL);
+	TALLOC_FREE(subreq);
+	if (ret != 0) {
+		DBG_DEBUG("messaging_filtered_read failed: %s\n",
+			  strerror(ret));
+		tevent_req_nterror(req, map_nt_error_from_unix(ret));
+		return;
+	}
+
+	/*
+	 * We should never have gotten here, all work is done from the
+	 * filter function.
+	 */
+	tevent_req_nterror(req, NT_STATUS_INTERNAL_ERROR);
+}
+
+NTSTATUS fcn_wait_recv(
+	struct tevent_req *req,
+	TALLOC_CTX *mem_ctx,
+	struct timespec *when,
+	uint32_t *action,
+	char **path)
+{
+	struct fcn_wait_state *state = tevent_req_data(
+		req, struct fcn_wait_state);
+	struct fcn_event *evt = NULL;
+	NTSTATUS status;
+
+	if (!tevent_req_is_in_progress(req) &&
+	    tevent_req_is_nterror(req, &status)) {
+		return status;
+	}
+	evt = state->events;
+	if (evt == NULL) {
+		return NT_STATUS_RETRY;
+	}
+
+	if (path != NULL) {
+		*path = talloc_strdup(mem_ctx, evt->msg.path);
+		if ((*path) == NULL) {
+			return NT_STATUS_NO_MEMORY;
+		}
+	}
+	if (when != NULL) {
+		*when = evt->msg.when;
+	}
+	if (action != NULL) {
+		*action = evt->msg.action;
+	}
+
+	DLIST_REMOVE(state->events, evt);
+
+	if (state->events != NULL) {
+		tevent_req_defer_callback(req, state->ev);
+		tevent_req_notify_callback(req);
+	}
+
+	return NT_STATUS_OK;
+}