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10dbeddab5
If the buffer size provided is not sufficient, then return the required buffer length. Signed-off-by: Amitay Isaacs <amitay@gmail.com> Reviewed-by: Martin Schwenke <martin@meltin.net>
438 lines
9.8 KiB
C
438 lines
9.8 KiB
C
/*
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CTDB client code
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Copyright (C) Amitay Isaacs 2015
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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 "system/filesys.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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/*
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* Handle REQ_CONTROL and REPLY_CONTROL
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*/
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struct ctdb_client_control_state {
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struct ctdb_client_context *client;
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uint32_t opcode;
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uint32_t flags;
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uint32_t reqid;
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struct ctdb_reply_control *reply;
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struct tevent_req *req;
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};
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static int ctdb_client_control_state_destructor(
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struct ctdb_client_control_state *state);
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static void ctdb_client_control_done(struct tevent_req *subreq);
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struct tevent_req *ctdb_client_control_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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uint32_t destnode,
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struct timeval timeout,
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struct ctdb_req_control *request)
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{
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struct ctdb_req_header h;
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struct tevent_req *req, *subreq;
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struct ctdb_client_control_state *state;
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uint32_t reqid;
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uint8_t *buf;
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size_t datalen, buflen;
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int ret;
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req = tevent_req_create(mem_ctx, &state,
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struct ctdb_client_control_state);
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if (req == NULL) {
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return NULL;
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}
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reqid = reqid_new(client->idr, state);
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if (reqid == REQID_INVALID) {
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talloc_free(req);
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return NULL;
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}
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state->client = client;
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state->flags = request->flags;
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state->opcode = request->opcode;
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state->reqid = reqid;
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state->req = req;
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state->reply = talloc_zero(state, struct ctdb_reply_control);
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if (tevent_req_nomem(state->reply, req)) {
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return tevent_req_post(req, ev);
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}
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state->reply->rdata.opcode = request->rdata.opcode;
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talloc_set_destructor(state, ctdb_client_control_state_destructor);
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ctdb_req_header_fill(&h, 0, CTDB_REQ_CONTROL, destnode,
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client->pnn, reqid);
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datalen = ctdb_req_control_len(&h, request);
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ret = ctdb_allocate_pkt(state, datalen, &buf, &buflen);
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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_control_push(&h, request, buf, &buflen);
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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, client->comm, buf, buflen);
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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_client_control_done, req);
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return req;
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}
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static int ctdb_client_control_state_destructor(
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struct ctdb_client_control_state *state)
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{
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reqid_remove(state->client->idr, state->reqid);
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return 0;
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}
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static void ctdb_client_control_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_client_control_state *state = tevent_req_data(
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req, struct ctdb_client_control_state);
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bool status;
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int ret;
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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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/* Daemon will not reply, so we set status to 0 */
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if (state->flags & CTDB_CTRL_FLAG_NOREPLY) {
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state->reply->status = 0;
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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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void ctdb_client_reply_control(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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struct ctdb_req_header h;
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struct ctdb_client_control_state *state;
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int ret;
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state = reqid_find(client->idr, reqid,
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struct ctdb_client_control_state);
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if (state == NULL) {
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return;
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}
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if (reqid != state->reqid) {
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return;
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}
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ret = ctdb_reply_control_pull(buf, buflen, state->opcode, &h,
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state->reply, state->reply);
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if (ret != 0) {
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tevent_req_error(state->req, ret);
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return;
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}
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tevent_req_done(state->req);
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}
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bool ctdb_client_control_recv(struct tevent_req *req, int *perr,
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TALLOC_CTX *mem_ctx,
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struct ctdb_reply_control **reply)
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{
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struct ctdb_client_control_state *state = tevent_req_data(
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req, struct ctdb_client_control_state);
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int err;
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if (tevent_req_is_unix_error(req, &err)) {
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if (perr != NULL) {
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*perr = err;
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}
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return false;
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}
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if (reply != NULL) {
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*reply = talloc_steal(mem_ctx, state->reply);
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}
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return true;
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}
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/*
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* Handle multiple nodes - there cannot be any return data
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*/
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struct ctdb_client_control_multi_state {
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uint32_t *pnn_list;
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int count;
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int done;
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int err;
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int *err_list;
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struct ctdb_reply_control **reply;
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};
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struct control_index_state {
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struct tevent_req *req;
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int index;
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};
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static void ctdb_client_control_multi_done(struct tevent_req *subreq);
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struct tevent_req *ctdb_client_control_multi_send(
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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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uint32_t *pnn_list, int count,
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struct timeval timeout,
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struct ctdb_req_control *request)
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{
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struct tevent_req *req, *subreq;
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struct ctdb_client_control_multi_state *state;
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int i;
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if (pnn_list == NULL || count == 0) {
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return NULL;
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}
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req = tevent_req_create(mem_ctx, &state,
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struct ctdb_client_control_multi_state);
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if (req == NULL) {
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return NULL;
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}
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state->pnn_list = pnn_list;
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state->count = count;
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state->done = 0;
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state->err = 0;
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state->err_list = talloc_zero_array(state, int, count);
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if (tevent_req_nomem(state->err_list, req)) {
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return tevent_req_post(req, ev);
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}
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state->reply = talloc_zero_array(state, struct ctdb_reply_control *,
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count);
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if (tevent_req_nomem(state->reply, req)) {
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return tevent_req_post(req, ev);
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}
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for (i=0; i<count; i++) {
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struct control_index_state *substate;
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subreq = ctdb_client_control_send(state, ev, client,
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pnn_list[i], timeout,
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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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substate = talloc(subreq, struct control_index_state);
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if (tevent_req_nomem(substate, req)) {
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return tevent_req_post(req, ev);
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}
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substate->req = req;
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substate->index = i;
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tevent_req_set_callback(subreq, ctdb_client_control_multi_done,
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substate);
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}
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return req;
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}
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static void ctdb_client_control_multi_done(struct tevent_req *subreq)
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{
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struct control_index_state *substate = tevent_req_callback_data(
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subreq, struct control_index_state);
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struct tevent_req *req = substate->req;
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int idx = substate->index;
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struct ctdb_client_control_multi_state *state = tevent_req_data(
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req, struct ctdb_client_control_multi_state);
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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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&state->reply[idx]);
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TALLOC_FREE(subreq);
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if (! status) {
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if (state->err == 0) {
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state->err = ret;
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state->err_list[idx] = state->err;
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}
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} else {
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if (state->reply[idx]->status != 0) {
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if (state->err == 0) {
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state->err = state->reply[idx]->status;
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state->err_list[idx] = state->err;
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}
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}
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}
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state->done += 1;
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if (state->done == state->count) {
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tevent_req_done(req);
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}
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}
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bool ctdb_client_control_multi_recv(struct tevent_req *req, int *perr,
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TALLOC_CTX *mem_ctx, int **perr_list,
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struct ctdb_reply_control ***preply)
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{
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struct ctdb_client_control_multi_state *state = tevent_req_data(
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req, struct ctdb_client_control_multi_state);
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int err;
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if (tevent_req_is_unix_error(req, &err)) {
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if (perr != NULL) {
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*perr = err;
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}
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if (perr_list != NULL) {
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*perr_list = talloc_steal(mem_ctx, state->err_list);
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}
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return false;
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}
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if (perr != NULL) {
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*perr = state->err;
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}
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if (perr_list != NULL) {
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*perr_list = talloc_steal(mem_ctx, state->err_list);
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}
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if (preply != NULL) {
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*preply = talloc_steal(mem_ctx, state->reply);
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}
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if (state->err != 0) {
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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_client_control_multi_error(uint32_t *pnn_list, int count,
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int *err_list, uint32_t *pnn)
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{
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int ret = 0, i;
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for (i=0; i<count; i++) {
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if (err_list[i] != 0) {
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ret = err_list[i];
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*pnn = pnn_list[i];
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}
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}
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return ret;
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}
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/*
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* Sync version of control send/recv
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*/
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int ctdb_client_control(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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uint32_t destnode,
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struct timeval timeout,
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struct ctdb_req_control *request,
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struct ctdb_reply_control **reply)
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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_client_control_send(mem_ctx, ev, client, destnode, timeout,
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request);
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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_client_control_recv(req, &ret, mem_ctx, reply);
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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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int ctdb_client_control_multi(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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uint32_t *pnn_list, int count,
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struct timeval timeout,
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struct ctdb_req_control *request,
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int **perr_list,
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struct ctdb_reply_control ***preply)
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{
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struct tevent_req *req;
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bool status;
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int ret;
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req = ctdb_client_control_multi_send(mem_ctx, ev, client,
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pnn_list, count,
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timeout, request);
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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_client_control_multi_recv(req, &ret, mem_ctx, perr_list,
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preply);
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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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