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ad1a9176d1
Signed-off-by: Amitay Isaacs <amitay@gmail.com> Reviewed-by: Martin Schwenke <martin@meltin.net>
690 lines
16 KiB
C
690 lines
16 KiB
C
/*
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CTDB client code
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Copyright (C) Amitay Isaacs 2016
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#include "replace.h"
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#include "system/network.h"
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#include <talloc.h>
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#include <tevent.h>
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#include <tdb.h>
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#include "lib/util/tevent_unix.h"
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#include "common/reqid.h"
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#include "common/srvid.h"
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#include "common/comm.h"
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#include "protocol/protocol.h"
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#include "protocol/protocol_api.h"
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#include "client/client_private.h"
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#include "client/client.h"
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struct ctdb_tunnel_data {
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struct ctdb_req_header hdr;
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struct ctdb_req_tunnel *tunnel;
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uint32_t reqid;
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};
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/*
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* Tunnel setup and destroy
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*/
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struct ctdb_tunnel_setup_state {
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struct ctdb_client_context *client;
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struct ctdb_tunnel_context *tctx;
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uint64_t tunnel_id;
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};
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static void ctdb_tunnel_setup_register_done(struct tevent_req *subreq);
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static void ctdb_tunnel_handler(uint64_t tunnel_id, TDB_DATA data,
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void *private_data);
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struct tevent_req *ctdb_tunnel_setup_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_client_context *client,
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uint64_t tunnel_id,
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ctdb_tunnel_callback_func_t callback,
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void *private_data)
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{
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struct tevent_req *req, *subreq;
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struct ctdb_tunnel_setup_state *state;
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struct ctdb_tunnel_context *tctx;
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struct ctdb_req_control request;
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int ret;
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req = tevent_req_create(mem_ctx, &state,
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struct ctdb_tunnel_setup_state);
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if (req == NULL) {
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return NULL;
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}
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tctx = talloc_zero(client, struct ctdb_tunnel_context);
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if (tevent_req_nomem(tctx, req)) {
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return tevent_req_post(req, ev);
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}
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tctx->client = client;
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tctx->tunnel_id = tunnel_id;
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tctx->callback = callback;
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tctx->private_data = private_data;
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state->client = client;
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state->tunnel_id = tunnel_id;
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state->tctx = tctx;
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ret = srvid_exists(client->tunnels, tunnel_id, NULL);
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if (ret == 0) {
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tevent_req_error(req, EEXIST);
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return tevent_req_post(req, ev);
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}
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ctdb_req_control_tunnel_register(&request, tunnel_id);
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subreq = ctdb_client_control_send(state, ev, client,
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ctdb_client_pnn(client),
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tevent_timeval_zero(),
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&request);
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_req_set_callback(subreq, ctdb_tunnel_setup_register_done, req);
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return req;
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}
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static void ctdb_tunnel_setup_register_done(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(
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subreq, struct tevent_req);
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struct ctdb_tunnel_setup_state *state = tevent_req_data(
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req, struct ctdb_tunnel_setup_state);
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struct ctdb_reply_control *reply;
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bool status;
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int ret;
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status = ctdb_client_control_recv(subreq, &ret, state, &reply);
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TALLOC_FREE(subreq);
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if (! status) {
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tevent_req_error(req, ret);
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return;
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}
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ret = ctdb_reply_control_tunnel_register(reply);
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talloc_free(reply);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return;
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}
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ret = srvid_register(state->client->tunnels, state->client,
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state->tunnel_id,
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ctdb_tunnel_handler, state->tctx);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return;
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}
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tevent_req_done(req);
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}
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static void ctdb_tunnel_handler(uint64_t tunnel_id, TDB_DATA data,
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void *private_data)
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{
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struct ctdb_tunnel_context *tctx = talloc_get_type_abort(
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private_data, struct ctdb_tunnel_context);
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struct ctdb_tunnel_data *tunnel_data;
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if (tctx->tunnel_id != tunnel_id) {
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return;
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}
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if (data.dsize != sizeof(tunnel_data)) {
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return;
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}
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tunnel_data = (struct ctdb_tunnel_data *)data.dptr;
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tctx->callback(tctx, tunnel_data->hdr.srcnode, tunnel_data->reqid,
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tunnel_data->tunnel->data.dptr,
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tunnel_data->tunnel->data.dsize, tctx->private_data);
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}
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bool ctdb_tunnel_setup_recv(struct tevent_req *req, int *perr,
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struct ctdb_tunnel_context **result)
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{
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struct ctdb_tunnel_setup_state *state = tevent_req_data(
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req, struct ctdb_tunnel_setup_state);
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int ret;
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if (tevent_req_is_unix_error(req, &ret)) {
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if (perr != NULL) {
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*perr = ret;
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}
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return false;
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}
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*result = state->tctx;
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return true;
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}
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int ctdb_tunnel_setup(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
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struct ctdb_client_context *client, uint64_t tunnel_id,
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ctdb_tunnel_callback_func_t callback, void *private_data,
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struct ctdb_tunnel_context **result)
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{
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struct tevent_req *req;
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int ret;
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bool status;
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req = ctdb_tunnel_setup_send(mem_ctx, ev, client, tunnel_id,
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callback, private_data);
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if (req == NULL) {
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return ENOMEM;
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}
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tevent_req_poll(req, ev);
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status = ctdb_tunnel_setup_recv(req, &ret, result);
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talloc_free(req);
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if (! status) {
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return ret;
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}
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return 0;
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}
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struct ctdb_tunnel_destroy_state {
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struct ctdb_tunnel_context *tctx;
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};
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static void ctdb_tunnel_destroy_deregister_done(struct tevent_req *subreq);
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struct tevent_req *ctdb_tunnel_destroy_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_tunnel_context *tctx)
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{
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struct tevent_req *req, *subreq;
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struct ctdb_tunnel_destroy_state *state;
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struct ctdb_req_control request;
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req = tevent_req_create(mem_ctx, &state,
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struct ctdb_tunnel_destroy_state);
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if (req == NULL) {
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return NULL;
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}
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state->tctx = tctx;
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ctdb_req_control_tunnel_deregister(&request, tctx->tunnel_id);
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subreq = ctdb_client_control_send(state, ev, tctx->client,
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ctdb_client_pnn(tctx->client),
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tevent_timeval_zero(),
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&request);
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_req_set_callback(subreq, ctdb_tunnel_destroy_deregister_done,
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req);
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return req;
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}
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static void ctdb_tunnel_destroy_deregister_done(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(
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subreq, struct tevent_req);
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struct ctdb_tunnel_destroy_state *state = tevent_req_data(
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req, struct ctdb_tunnel_destroy_state);
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struct ctdb_client_context *client = state->tctx->client;
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struct ctdb_reply_control *reply;
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bool status;
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int ret;
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status = ctdb_client_control_recv(subreq, &ret, state, &reply);
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TALLOC_FREE(subreq);
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if (! status) {
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tevent_req_error(req, ret);
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return;
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}
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ret = ctdb_reply_control_tunnel_deregister(reply);
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talloc_free(reply);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return;
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}
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ret = srvid_deregister(client->tunnels, state->tctx->tunnel_id,
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state->tctx);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return;
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}
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tevent_req_done(req);
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}
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bool ctdb_tunnel_destroy_recv(struct tevent_req *req, int *perr)
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{
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int ret;
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if (tevent_req_is_unix_error(req, &ret)) {
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if (perr != NULL) {
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*perr = ret;
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}
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return false;
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}
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return true;
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}
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int ctdb_tunnel_destroy(struct tevent_context *ev,
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struct ctdb_tunnel_context *tctx)
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{
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struct tevent_req *req;
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int ret;
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bool status;
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req = ctdb_tunnel_destroy_send(ev, ev, tctx);
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if (req == NULL) {
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return ENOMEM;
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}
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tevent_req_poll(req, ev);
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status = ctdb_tunnel_destroy_recv(req, &ret);
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talloc_free(req);
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if (! status) {
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return ret;
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}
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return 0;
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}
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/*
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* Callback when REQ_TUNNEL packet is received
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*/
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static void ctdb_tunnel_request_reply(struct tevent_req *req,
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struct ctdb_tunnel_data *tunnel_data);
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void ctdb_client_req_tunnel(struct ctdb_client_context *client,
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uint8_t *buf, size_t buflen, uint32_t reqid)
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{
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TALLOC_CTX *tmp_ctx = talloc_new(client);
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struct ctdb_req_header h;
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struct ctdb_req_tunnel *tunnel;
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struct tevent_req *req;
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struct ctdb_tunnel_data tunnel_data;
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int ret;
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tunnel = talloc_zero(tmp_ctx, struct ctdb_req_tunnel);
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if (tunnel == NULL) {
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goto fail;
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}
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ret = ctdb_req_tunnel_pull(buf, buflen, &h, tmp_ctx, tunnel);
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if (ret != 0) {
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goto fail;
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}
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tunnel_data = (struct ctdb_tunnel_data) {
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.hdr = h,
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.tunnel = tunnel,
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.reqid = reqid,
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};
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if (tunnel->flags & CTDB_TUNNEL_FLAG_REPLY) {
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req = reqid_find(client->idr, reqid, struct tevent_req);
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if (req == NULL) {
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goto fail;
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}
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ctdb_tunnel_request_reply(req, &tunnel_data);
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} else if (tunnel->flags & CTDB_TUNNEL_FLAG_REQUEST) {
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TDB_DATA data = {
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.dsize = sizeof(&tunnel_data),
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.dptr = (uint8_t *)&tunnel_data,
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};
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srvid_dispatch(client->tunnels, tunnel->tunnel_id, 0, data);
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}
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fail:
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TALLOC_FREE(tmp_ctx);
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}
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/*
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* Send messages using tunnel
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*/
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struct ctdb_tunnel_request_state {
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struct ctdb_tunnel_context *tctx;
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bool wait_for_reply;
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uint32_t reqid;
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struct ctdb_req_tunnel *tunnel;
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};
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static int ctdb_tunnel_request_state_destructor(
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struct ctdb_tunnel_request_state *state);
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static void ctdb_tunnel_request_done(struct tevent_req *subreq);
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struct tevent_req *ctdb_tunnel_request_send(TALLOC_CTX *mem_ctx,
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struct tevent_context *ev,
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struct ctdb_tunnel_context *tctx,
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int destnode,
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struct timeval timeout,
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uint8_t *buf, size_t buflen,
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bool wait_for_reply)
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{
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struct tevent_req *req, *subreq;
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struct ctdb_tunnel_request_state *state;
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struct ctdb_req_tunnel tunnel;
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struct ctdb_req_header h;
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uint8_t *pkt;
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size_t datalen, pkt_len;
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int ret;
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req = tevent_req_create(mem_ctx, &state,
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struct ctdb_tunnel_request_state);
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if (req == NULL) {
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return NULL;
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}
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state->tctx = tctx;
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state->wait_for_reply = wait_for_reply;
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state->reqid = reqid_new(tctx->client->idr, req);
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if (state->reqid == REQID_INVALID) {
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talloc_free(req);
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return NULL;
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}
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talloc_set_destructor(state, ctdb_tunnel_request_state_destructor);
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tunnel = (struct ctdb_req_tunnel) {
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.tunnel_id = state->tctx->tunnel_id,
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.flags = CTDB_TUNNEL_FLAG_REQUEST,
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.data = (TDB_DATA) {
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.dptr = buf,
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.dsize = buflen,
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},
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};
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if (destnode == CTDB_BROADCAST_ALL ||
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destnode == CTDB_BROADCAST_VNNMAP ||
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destnode == CTDB_BROADCAST_ALL) {
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state->wait_for_reply = false;
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}
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if (! state->wait_for_reply) {
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tunnel.flags |= CTDB_TUNNEL_FLAG_NOREPLY;
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}
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ctdb_req_header_fill(&h, 0, CTDB_REQ_TUNNEL, destnode,
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ctdb_client_pnn(state->tctx->client),
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state->reqid);
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datalen = ctdb_req_tunnel_len(&h, &tunnel);
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ret = ctdb_allocate_pkt(state, datalen, &pkt, &pkt_len);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return tevent_req_post(req, ev);
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}
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ret = ctdb_req_tunnel_push(&h, &tunnel, pkt, &pkt_len);
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if (ret != 0) {
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tevent_req_error(req, ret);
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return tevent_req_post(req, ev);
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}
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if (!tevent_timeval_is_zero(&timeout)) {
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tevent_req_set_endtime(req, ev, timeout);
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}
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subreq = comm_write_send(state, ev, tctx->client->comm,
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pkt, pkt_len);
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if (tevent_req_nomem(subreq, req)) {
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return tevent_req_post(req, ev);
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}
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tevent_req_set_callback(subreq, ctdb_tunnel_request_done, req);
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return req;
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}
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static int ctdb_tunnel_request_state_destructor(
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struct ctdb_tunnel_request_state *state)
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{
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reqid_remove(state->tctx->client->idr, state->reqid);
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return 0;
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}
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static void ctdb_tunnel_request_done(struct tevent_req *subreq)
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{
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struct tevent_req *req = tevent_req_callback_data(
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subreq, struct tevent_req);
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struct ctdb_tunnel_request_state *state = tevent_req_data(
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req, struct ctdb_tunnel_request_state);
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int ret;
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bool status;
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status = comm_write_recv(subreq, &ret);
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TALLOC_FREE(subreq);
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if (! status) {
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tevent_req_error(req, ret);
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return;
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}
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if (! state->wait_for_reply) {
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tevent_req_done(req);
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}
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/* Wait for the reply or timeout */
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}
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static void ctdb_tunnel_request_reply(struct tevent_req *req,
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struct ctdb_tunnel_data *tunnel_data)
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{
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struct ctdb_tunnel_request_state *state = tevent_req_data(
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req, struct ctdb_tunnel_request_state);
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if (tunnel_data->reqid != state->reqid) {
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return;
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}
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state->tunnel = talloc_steal(state, tunnel_data->tunnel);
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tevent_req_done(req);
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}
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bool ctdb_tunnel_request_recv(struct tevent_req *req, int *perr,
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TALLOC_CTX *mem_ctx, uint8_t **buf,
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size_t *buflen)
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{
|
|
struct ctdb_tunnel_request_state *state = tevent_req_data(
|
|
req, struct ctdb_tunnel_request_state);
|
|
int ret;
|
|
|
|
if (tevent_req_is_unix_error(req, &ret)) {
|
|
if (perr != NULL) {
|
|
*perr = ret;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
if (state->wait_for_reply) {
|
|
if (buf != NULL) {
|
|
*buf = talloc_steal(mem_ctx, state->tunnel->data.dptr);
|
|
}
|
|
if (buflen != NULL) {
|
|
*buflen = state->tunnel->data.dsize;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int ctdb_tunnel_request(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
|
|
struct ctdb_tunnel_context *tctx, int destnode,
|
|
struct timeval timeout, uint8_t *buf, size_t buflen,
|
|
bool wait_for_reply)
|
|
{
|
|
struct tevent_req *req;
|
|
int ret;
|
|
bool status;
|
|
|
|
req = ctdb_tunnel_request_send(mem_ctx, ev, tctx, destnode,
|
|
timeout, buf, buflen, wait_for_reply);
|
|
if (req == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
|
|
tevent_req_poll(req, ev);
|
|
|
|
status = ctdb_tunnel_request_recv(req, &ret, NULL, NULL, NULL);
|
|
talloc_free(req);
|
|
if (! status) {
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct ctdb_tunnel_reply_state {
|
|
};
|
|
|
|
static void ctdb_tunnel_reply_done(struct tevent_req *subreq);
|
|
|
|
struct tevent_req *ctdb_tunnel_reply_send(TALLOC_CTX *mem_ctx,
|
|
struct tevent_context *ev,
|
|
struct ctdb_tunnel_context *tctx,
|
|
int destnode, uint32_t reqid,
|
|
struct timeval timeout,
|
|
uint8_t *buf, size_t buflen)
|
|
{
|
|
struct tevent_req *req, *subreq;
|
|
struct ctdb_tunnel_reply_state *state;
|
|
struct ctdb_req_tunnel tunnel;
|
|
struct ctdb_req_header h;
|
|
uint8_t *pkt;
|
|
size_t datalen, pkt_len;
|
|
int ret;
|
|
|
|
req = tevent_req_create(mem_ctx, &state,
|
|
struct ctdb_tunnel_reply_state);
|
|
if (req == NULL) {
|
|
return NULL;
|
|
}
|
|
|
|
tunnel = (struct ctdb_req_tunnel) {
|
|
.tunnel_id = tctx->tunnel_id,
|
|
.flags = CTDB_TUNNEL_FLAG_REPLY,
|
|
.data = (TDB_DATA) {
|
|
.dptr = buf,
|
|
.dsize = buflen,
|
|
},
|
|
};
|
|
|
|
ctdb_req_header_fill(&h, 0, CTDB_REQ_TUNNEL, destnode,
|
|
ctdb_client_pnn(tctx->client), reqid);
|
|
|
|
datalen = ctdb_req_tunnel_len(&h, &tunnel);
|
|
ret = ctdb_allocate_pkt(state, datalen, &pkt, &pkt_len);
|
|
if (ret != 0) {
|
|
tevent_req_error(req, ret);
|
|
return tevent_req_post(req, ev);
|
|
}
|
|
|
|
ret = ctdb_req_tunnel_push(&h, &tunnel, pkt, &pkt_len);
|
|
if (ret != 0) {
|
|
tevent_req_error(req, ret);
|
|
return tevent_req_post(req, ev);
|
|
}
|
|
|
|
if (!tevent_timeval_is_zero(&timeout)) {
|
|
tevent_req_set_endtime(req, ev, timeout);
|
|
}
|
|
|
|
subreq = comm_write_send(state, ev, tctx->client->comm, pkt, pkt_len);
|
|
if (tevent_req_nomem(subreq, req)) {
|
|
return tevent_req_post(req, ev);
|
|
}
|
|
tevent_req_set_callback(subreq, ctdb_tunnel_reply_done, req);
|
|
|
|
return req;
|
|
}
|
|
|
|
static void ctdb_tunnel_reply_done(struct tevent_req *subreq)
|
|
{
|
|
struct tevent_req *req = tevent_req_callback_data(
|
|
subreq, struct tevent_req);
|
|
int ret;
|
|
bool status;
|
|
|
|
status = comm_write_recv(subreq, &ret);
|
|
TALLOC_FREE(subreq);
|
|
if (! status) {
|
|
tevent_req_error(req, ret);
|
|
return;
|
|
}
|
|
|
|
tevent_req_done(req);
|
|
}
|
|
|
|
bool ctdb_tunnel_reply_recv(struct tevent_req *req, int *perr)
|
|
{
|
|
int ret;
|
|
|
|
if (tevent_req_is_unix_error(req, &ret)) {
|
|
if (perr != NULL) {
|
|
*perr = ret;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
int ctdb_tunnel_reply(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
|
|
struct ctdb_tunnel_context *tctx, int destnode,
|
|
uint32_t reqid, struct timeval timeout,
|
|
uint8_t *buf, size_t buflen)
|
|
{
|
|
struct tevent_req *req;
|
|
int ret;
|
|
bool status;
|
|
|
|
req = ctdb_tunnel_reply_send(mem_ctx, ev, tctx, destnode, reqid,
|
|
timeout, buf, buflen);
|
|
if (req == NULL) {
|
|
return ENOMEM;
|
|
}
|
|
|
|
tevent_req_poll(req, ev);
|
|
|
|
status = ctdb_tunnel_reply_recv(req, &ret);
|
|
talloc_free(req);
|
|
if (! status) {
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|