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-rw-r--r--ctdb/client/client_tunnel.c693
1 files changed, 693 insertions, 0 deletions
diff --git a/ctdb/client/client_tunnel.c b/ctdb/client/client_tunnel.c
new file mode 100644
index 0000000..13c35fb
--- /dev/null
+++ b/ctdb/client/client_tunnel.c
@@ -0,0 +1,693 @@
+/*
+ CTDB client code
+
+ Copyright (C) Amitay Isaacs 2016
+
+ 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 "system/network.h"
+
+#include <talloc.h>
+#include <tevent.h>
+#include <tdb.h>
+
+#include "lib/util/tevent_unix.h"
+
+#include "common/reqid.h"
+#include "common/srvid.h"
+#include "common/comm.h"
+
+#include "protocol/protocol.h"
+#include "protocol/protocol_api.h"
+
+#include "client/client_private.h"
+#include "client/client.h"
+
+
+struct ctdb_tunnel_data {
+ struct ctdb_req_header hdr;
+ struct ctdb_req_tunnel *tunnel;
+ uint32_t reqid;
+};
+
+/*
+ * Tunnel setup and destroy
+ */
+
+struct ctdb_tunnel_setup_state {
+ struct ctdb_client_context *client;
+ struct ctdb_tunnel_context *tctx;
+ uint64_t tunnel_id;
+};
+
+static void ctdb_tunnel_setup_register_done(struct tevent_req *subreq);
+static void ctdb_tunnel_handler(uint64_t tunnel_id, TDB_DATA data,
+ void *private_data);
+
+struct tevent_req *ctdb_tunnel_setup_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct ctdb_client_context *client,
+ uint64_t tunnel_id,
+ ctdb_tunnel_callback_func_t callback,
+ void *private_data)
+{
+ struct tevent_req *req, *subreq;
+ struct ctdb_tunnel_setup_state *state;
+ struct ctdb_tunnel_context *tctx;
+ struct ctdb_req_control request;
+ int ret;
+
+ req = tevent_req_create(mem_ctx, &state,
+ struct ctdb_tunnel_setup_state);
+ if (req == NULL) {
+ return NULL;
+ }
+
+ tctx = talloc_zero(client, struct ctdb_tunnel_context);
+ if (tevent_req_nomem(tctx, req)) {
+ return tevent_req_post(req, ev);
+ }
+
+ tctx->client = client;
+ tctx->tunnel_id = tunnel_id;
+ tctx->callback = callback;
+ tctx->private_data = private_data;
+
+ state->client = client;
+ state->tunnel_id = tunnel_id;
+ state->tctx = tctx;
+
+ ret = srvid_exists(client->tunnels, tunnel_id, NULL);
+ if (ret == 0) {
+ tevent_req_error(req, EEXIST);
+ return tevent_req_post(req, ev);
+ }
+
+ ctdb_req_control_tunnel_register(&request, tunnel_id);
+ subreq = ctdb_client_control_send(state, ev, client,
+ ctdb_client_pnn(client),
+ tevent_timeval_zero(),
+ &request);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, ctdb_tunnel_setup_register_done, req);
+
+ return req;
+}
+
+static void ctdb_tunnel_setup_register_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct ctdb_tunnel_setup_state *state = tevent_req_data(
+ req, struct ctdb_tunnel_setup_state);
+ struct ctdb_reply_control *reply;
+ bool status;
+ int ret;
+
+ status = ctdb_client_control_recv(subreq, &ret, state, &reply);
+ TALLOC_FREE(subreq);
+ if (! status) {
+ tevent_req_error(req, ret);
+ return;
+ }
+
+ ret = ctdb_reply_control_tunnel_register(reply);
+ talloc_free(reply);
+ if (ret != 0) {
+ tevent_req_error(req, ret);
+ return;
+ }
+
+ ret = srvid_register(state->client->tunnels, state->client,
+ state->tunnel_id,
+ ctdb_tunnel_handler, state->tctx);
+ if (ret != 0) {
+ tevent_req_error(req, ret);
+ return;
+ }
+
+ tevent_req_done(req);
+}
+
+static void ctdb_tunnel_handler(uint64_t tunnel_id, TDB_DATA data,
+ void *private_data)
+{
+ struct ctdb_tunnel_context *tctx = talloc_get_type_abort(
+ private_data, struct ctdb_tunnel_context);
+ struct ctdb_tunnel_data *tunnel_data;
+
+ if (tctx->tunnel_id != tunnel_id) {
+ return;
+ }
+
+ if (data.dsize != sizeof(struct ctdb_tunnel_data)) {
+ return;
+ }
+
+ tunnel_data = (struct ctdb_tunnel_data *)data.dptr;
+
+ tctx->callback(tctx, tunnel_data->hdr.srcnode, tunnel_data->reqid,
+ tunnel_data->tunnel->data.dptr,
+ tunnel_data->tunnel->data.dsize, tctx->private_data);
+}
+
+bool ctdb_tunnel_setup_recv(struct tevent_req *req, int *perr,
+ struct ctdb_tunnel_context **result)
+{
+ struct ctdb_tunnel_setup_state *state = tevent_req_data(
+ req, struct ctdb_tunnel_setup_state);
+ int ret;
+
+ if (tevent_req_is_unix_error(req, &ret)) {
+ if (perr != NULL) {
+ *perr = ret;
+ }
+ return false;
+ }
+
+ *result = state->tctx;
+ return true;
+}
+
+int ctdb_tunnel_setup(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
+ struct ctdb_client_context *client, uint64_t tunnel_id,
+ ctdb_tunnel_callback_func_t callback, void *private_data,
+ struct ctdb_tunnel_context **result)
+{
+ struct tevent_req *req;
+ int ret;
+ bool status;
+
+ req = ctdb_tunnel_setup_send(mem_ctx, ev, client, tunnel_id,
+ callback, private_data);
+ if (req == NULL) {
+ return ENOMEM;
+ }
+
+ tevent_req_poll(req, ev);
+
+ status = ctdb_tunnel_setup_recv(req, &ret, result);
+ talloc_free(req);
+ if (! status) {
+ return ret;
+ }
+
+ return 0;
+}
+
+struct ctdb_tunnel_destroy_state {
+ struct ctdb_tunnel_context *tctx;
+};
+
+static void ctdb_tunnel_destroy_deregister_done(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_tunnel_destroy_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct ctdb_tunnel_context *tctx)
+{
+ struct tevent_req *req, *subreq;
+ struct ctdb_tunnel_destroy_state *state;
+ struct ctdb_req_control request;
+
+ req = tevent_req_create(mem_ctx, &state,
+ struct ctdb_tunnel_destroy_state);
+ if (req == NULL) {
+ return NULL;
+ }
+
+ state->tctx = tctx;
+
+ ctdb_req_control_tunnel_deregister(&request, tctx->tunnel_id);
+ subreq = ctdb_client_control_send(state, ev, tctx->client,
+ ctdb_client_pnn(tctx->client),
+ tevent_timeval_zero(),
+ &request);
+ if (tevent_req_nomem(subreq, req)) {
+ return tevent_req_post(req, ev);
+ }
+ tevent_req_set_callback(subreq, ctdb_tunnel_destroy_deregister_done,
+ req);
+
+ return req;
+}
+
+static void ctdb_tunnel_destroy_deregister_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct ctdb_tunnel_destroy_state *state = tevent_req_data(
+ req, struct ctdb_tunnel_destroy_state);
+ struct ctdb_client_context *client = state->tctx->client;
+ struct ctdb_reply_control *reply;
+ bool status;
+ int ret;
+
+ status = ctdb_client_control_recv(subreq, &ret, state, &reply);
+ TALLOC_FREE(subreq);
+ if (! status) {
+ tevent_req_error(req, ret);
+ return;
+ }
+
+ ret = ctdb_reply_control_tunnel_deregister(reply);
+ talloc_free(reply);
+ if (ret != 0) {
+ tevent_req_error(req, ret);
+ return;
+ }
+
+ ret = srvid_deregister(client->tunnels, state->tctx->tunnel_id,
+ state->tctx);
+ if (ret != 0) {
+ tevent_req_error(req, ret);
+ return;
+ }
+
+ tevent_req_done(req);
+}
+
+bool ctdb_tunnel_destroy_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_destroy(struct tevent_context *ev,
+ struct ctdb_tunnel_context *tctx)
+{
+ struct tevent_req *req;
+ int ret;
+ bool status;
+
+ req = ctdb_tunnel_destroy_send(ev, ev, tctx);
+ if (req == NULL) {
+ return ENOMEM;
+ }
+
+ tevent_req_poll(req, ev);
+
+ status = ctdb_tunnel_destroy_recv(req, &ret);
+ talloc_free(req);
+ if (! status) {
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * Callback when REQ_TUNNEL packet is received
+ */
+
+static void ctdb_tunnel_request_reply(struct tevent_req *req,
+ struct ctdb_tunnel_data *tunnel_data);
+
+void ctdb_client_req_tunnel(struct ctdb_client_context *client,
+ uint8_t *buf, size_t buflen, uint32_t reqid)
+{
+ TALLOC_CTX *tmp_ctx = talloc_new(client);
+ struct ctdb_req_header h;
+ struct ctdb_req_tunnel *tunnel;
+ struct tevent_req *req;
+ struct ctdb_tunnel_data tunnel_data;
+ int ret;
+
+ tunnel = talloc_zero(tmp_ctx, struct ctdb_req_tunnel);
+ if (tunnel == NULL) {
+ goto fail;
+ }
+
+ ret = ctdb_req_tunnel_pull(buf, buflen, &h, tmp_ctx, tunnel);
+ if (ret != 0) {
+ goto fail;
+ }
+
+ tunnel_data = (struct ctdb_tunnel_data) {
+ .hdr = h,
+ .tunnel = tunnel,
+ .reqid = reqid,
+ };
+
+ if (tunnel->flags & CTDB_TUNNEL_FLAG_REPLY) {
+ req = reqid_find(client->idr, reqid, struct tevent_req);
+ if (req == NULL) {
+ goto fail;
+ }
+
+ ctdb_tunnel_request_reply(req, &tunnel_data);
+
+ } else if (tunnel->flags & CTDB_TUNNEL_FLAG_REQUEST) {
+
+ TDB_DATA data = {
+ .dsize = sizeof(struct ctdb_tunnel_data),
+ .dptr = (uint8_t *)&tunnel_data,
+ };
+
+ srvid_dispatch(client->tunnels, tunnel->tunnel_id, 0, data);
+ }
+
+fail:
+ TALLOC_FREE(tmp_ctx);
+}
+
+
+/*
+ * Send messages using tunnel
+ */
+
+struct ctdb_tunnel_request_state {
+ struct ctdb_tunnel_context *tctx;
+ bool wait_for_reply;
+ uint32_t reqid;
+ struct ctdb_req_tunnel *tunnel;
+};
+
+static int ctdb_tunnel_request_state_destructor(
+ struct ctdb_tunnel_request_state *state);
+static void ctdb_tunnel_request_done(struct tevent_req *subreq);
+
+struct tevent_req *ctdb_tunnel_request_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ struct ctdb_tunnel_context *tctx,
+ uint32_t destnode,
+ struct timeval timeout,
+ uint8_t *buf, size_t buflen,
+ bool wait_for_reply)
+{
+ struct tevent_req *req, *subreq;
+ struct ctdb_tunnel_request_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_request_state);
+ if (req == NULL) {
+ return NULL;
+ }
+
+ state->tctx = tctx;
+ state->wait_for_reply = wait_for_reply;
+ state->reqid = reqid_new(tctx->client->idr, req);
+ if (state->reqid == REQID_INVALID) {
+ talloc_free(req);
+ return NULL;
+ }
+
+ talloc_set_destructor(state, ctdb_tunnel_request_state_destructor);
+
+ tunnel = (struct ctdb_req_tunnel) {
+ .tunnel_id = state->tctx->tunnel_id,
+ .flags = CTDB_TUNNEL_FLAG_REQUEST,
+ .data = (TDB_DATA) {
+ .dptr = buf,
+ .dsize = buflen,
+ },
+ };
+
+ if (destnode == CTDB_BROADCAST_ALL ||
+ destnode == CTDB_BROADCAST_ACTIVE ||
+ destnode == CTDB_BROADCAST_CONNECTED) {
+ state->wait_for_reply = false;
+ }
+ if (! state->wait_for_reply) {
+ tunnel.flags |= CTDB_TUNNEL_FLAG_NOREPLY;
+ }
+
+ ctdb_req_header_fill(&h, 0, CTDB_REQ_TUNNEL, destnode,
+ ctdb_client_pnn(state->tctx->client),
+ state->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)) {
+ if (!tevent_req_set_endtime(req, ev, timeout)) {
+ return tevent_req_post(req, ev);
+ }
+ }
+
+ 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_request_done, req);
+
+ return req;
+}
+
+static int ctdb_tunnel_request_state_destructor(
+ struct ctdb_tunnel_request_state *state)
+{
+ reqid_remove(state->tctx->client->idr, state->reqid);
+ return 0;
+}
+
+static void ctdb_tunnel_request_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct ctdb_tunnel_request_state *state = tevent_req_data(
+ req, struct ctdb_tunnel_request_state);
+ int ret;
+ bool status;
+
+ status = comm_write_recv(subreq, &ret);
+ TALLOC_FREE(subreq);
+ if (! status) {
+ tevent_req_error(req, ret);
+ return;
+ }
+
+ if (! state->wait_for_reply) {
+ tevent_req_done(req);
+ }
+
+ /* Wait for the reply or timeout */
+}
+
+static void ctdb_tunnel_request_reply(struct tevent_req *req,
+ struct ctdb_tunnel_data *tunnel_data)
+{
+ struct ctdb_tunnel_request_state *state = tevent_req_data(
+ req, struct ctdb_tunnel_request_state);
+
+ if (tunnel_data->reqid != state->reqid) {
+ return;
+ }
+
+ state->tunnel = talloc_steal(state, tunnel_data->tunnel);
+ tevent_req_done(req);
+}
+
+bool ctdb_tunnel_request_recv(struct tevent_req *req, int *perr,
+ TALLOC_CTX *mem_ctx, uint8_t **buf,
+ size_t *buflen)
+{
+ 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, uint32_t 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,
+ uint32_t 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)) {
+ if (!tevent_req_set_endtime(req, ev, timeout)) {
+ return tevent_req_post(req, ev);
+ }
+ }
+
+ 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, uint32_t 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;
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-05-18 04:17:10 +0000