Adding upstream version 2:4.20.0+dfsg.upstream/2%4.20.0+dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 217 insertions, 0 deletions

diff --git a/ctdb/event/event_request.c b/ctdb/event/event_request.c
new file mode 100644
index 0000000..303e735
--- /dev/null
+++ b/ctdb/event/event_request.c
@@ -0,0 +1,217 @@
+/*
+   CTDB event daemon - handle requests
+
+   Copyright (C) Amitay Isaacs  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 "replace.h"
+
+#include "lib/util/debug.h"
+#include "lib/util/tevent_unix.h"
+
+#include "common/logging.h"
+
+#include "event/event_private.h"
+#include "event/event_protocol_api.h"
+
+struct event_request_state {
+	struct ctdb_event_request *request;
+	struct ctdb_event_reply *reply;
+};
+
+static void event_request_done(struct tevent_req *subreq);
+
+static struct tevent_req *event_request_send(
+					TALLOC_CTX *mem_ctx,
+					struct tevent_context *ev,
+					struct event_context *eventd,
+					struct ctdb_event_header *header,
+					struct ctdb_event_request *request)
+{
+	struct tevent_req *req, *subreq;
+	struct event_request_state *state;
+
+	req = tevent_req_create(mem_ctx, &state, struct event_request_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	state->request = request;
+
+	subreq = event_cmd_dispatch_send(state, ev, eventd, request);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, event_request_done, req);
+
+	return req;
+}
+
+static void event_request_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct event_request_state *state = tevent_req_data(
+		req, struct event_request_state);
+	int ret;
+	bool ok;
+
+	ok = event_cmd_dispatch_recv(subreq, &ret, state, &state->reply);
+	TALLOC_FREE(subreq);
+	if (!ok) {
+		D_ERR("Command %s failed, ret=%d\n",
+		      ctdb_event_command_to_string(state->request->cmd), ret);
+
+		state->reply = talloc_zero(state, struct ctdb_event_reply);
+		if (tevent_req_nomem(state->reply, req)) {
+			return;
+		}
+
+		state->reply->cmd = state->request->cmd;
+		state->reply->result = EIO;
+	}
+
+	tevent_req_done(req);
+}
+
+static bool event_request_recv(struct tevent_req *req,
+			       int *perr,
+			       TALLOC_CTX *mem_ctx,
+			       struct ctdb_event_reply **reply)
+{
+	struct event_request_state *state = tevent_req_data(
+		req, struct event_request_state);
+
+	if (tevent_req_is_unix_error(req, perr)) {
+		return false;
+	}
+
+	*reply = talloc_steal(mem_ctx, state->reply);
+
+	return true;
+}
+
+struct event_pkt_state {
+	struct ctdb_event_header header;
+	struct ctdb_event_request *request;
+	uint8_t *buf;
+	size_t buflen;
+};
+
+static void event_pkt_done(struct tevent_req *subreq);
+
+struct tevent_req *event_pkt_send(TALLOC_CTX *mem_ctx,
+				  struct tevent_context *ev,
+				  struct event_context *eventd,
+				  uint8_t *buf,
+				  size_t buflen)
+{
+	struct tevent_req *req, *subreq;
+	struct event_pkt_state *state;
+	int ret;
+
+	req = tevent_req_create(mem_ctx, &state, struct event_pkt_state);
+	if (req == NULL) {
+		return NULL;
+	}
+
+	ret = ctdb_event_request_pull(buf,
+				      buflen,
+				      &state->header,
+				      state,
+				      &state->request);
+	if (ret != 0) {
+		/* Ignore invalid packets */
+		D_ERR("Invalid packet received, buflen=%zu\n", buflen);
+		tevent_req_error(req, EPROTO);
+		return tevent_req_post(req, ev);
+	}
+
+	subreq = event_request_send(state,
+				  ev,
+				  eventd,
+				  &state->header,
+				  state->request);
+	if (tevent_req_nomem(subreq, req)) {
+		return tevent_req_post(req, ev);
+	}
+	tevent_req_set_callback(subreq, event_pkt_done, req);
+
+	return req;
+}
+
+static void event_pkt_done(struct tevent_req *subreq)
+{
+	struct tevent_req *req = tevent_req_callback_data(
+		subreq, struct tevent_req);
+	struct event_pkt_state *state = tevent_req_data(
+		req, struct event_pkt_state);
+	struct ctdb_event_header header;
+	struct ctdb_event_reply *reply;
+	int ret;
+	bool ok;
+
+	ok = event_request_recv(subreq, &ret, state, &reply);
+	TALLOC_FREE(subreq);
+	TALLOC_FREE(state->request);
+	if (!ok) {
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	header = (struct ctdb_event_header) {
+		.reqid = state->header.reqid,
+	};
+
+	state->buflen = ctdb_event_reply_len(&header, reply);
+	state->buf = talloc_zero_size(state, state->buflen);
+	if (tevent_req_nomem(state->buf, req)) {
+		talloc_free(reply);
+		return;
+	}
+
+	ret = ctdb_event_reply_push(&header,
+				    reply,
+				    state->buf,
+				    &state->buflen);
+	talloc_free(reply);
+	if (ret != 0) {
+		talloc_free(state->buf);
+		tevent_req_error(req, ret);
+		return;
+	}
+
+	tevent_req_done(req);
+}
+
+bool event_pkt_recv(struct tevent_req *req,
+		    int *perr,
+		    TALLOC_CTX *mem_ctx,
+		    uint8_t **buf,
+		    size_t *buflen)
+{
+	struct event_pkt_state *state = tevent_req_data(
+		req, struct event_pkt_state);
+
+	if (tevent_req_is_unix_error(req, perr)) {
+		return false;
+	}
+
+	*buf = talloc_steal(mem_ctx, state->buf);
+	*buflen = state->buflen;
+
+	return true;
+}