ctdb/client/client_connect.c

   1 /*
   2    CTDB client code
   3
   4    Copyright (C) Amitay Isaacs  2015
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #include "replace.h"
  21 #include "system/network.h"
  22 #include "system/filesys.h"
  23
  24 #include <talloc.h>
  25 #include <tevent.h>
  26 #include <tdb.h>
  27
  28 #include "common/reqid.h"
  29 #include "common/srvid.h"
  30 #include "common/comm.h"
  31 #include "common/logging.h"
  32
  33 #include "lib/util/tevent_unix.h"
  34 #include "lib/util/debug.h"
  35
  36 #include "protocol/protocol.h"
  37 #include "protocol/protocol_api.h"
  38
  39 #include "client/client_private.h"
  40 #include "client/client.h"
  41 #include "client/client_sync.h"
  42
  43 static void client_read_handler(uint8_t *buf, size_t buflen,
  44                                 void *private_data);
  45 static void client_dead_handler(void *private_data);
  46
  47 struct ctdb_client_init_state {
  48         struct ctdb_client_context *client;
  49 };
  50
  51 static int ctdb_client_context_destructor(struct ctdb_client_context *client);
  52 static void ctdb_client_init_done(struct tevent_req *subreq);
  53
  54 struct tevent_req *ctdb_client_init_send(TALLOC_CTX *mem_ctx,
  55                                          struct tevent_context *ev,
  56                                          const char *sockpath)
  57 {
  58         struct tevent_req *req, *subreq;
  59         struct ctdb_client_init_state *state;
  60         struct ctdb_client_context *client;
  61         struct ctdb_req_control request;
  62         struct sockaddr_un addr;
  63         size_t len;
  64         int ret;
  65
  66         req = tevent_req_create(mem_ctx, &state,
  67                                 struct ctdb_client_init_state);
  68         if (req == NULL) {
  69                 return NULL;
  70         }
  71
  72         if (sockpath == NULL) {
  73                 D_ERR("socket path cannot be NULL\n");
  74                 tevent_req_error(req, EINVAL);
  75                 return tevent_req_post(req, ev);
  76         }
  77
  78         client = talloc_zero(state, struct ctdb_client_context);
  79         if (tevent_req_nomem(client, req)) {
  80                 return tevent_req_post(req, ev);
  81         }
  82
  83         ret = reqid_init(client, INT_MAX-200, &client->idr);
  84         if (ret != 0) {
  85                 D_ERR("reqid_init() failed, ret=%d\n", ret);
  86                 talloc_free(client);
  87                 tevent_req_error(req, ret);
  88                 return tevent_req_post(req, ev);
  89         }
  90
  91         ret = srvid_init(client, &client->srv);
  92         if (ret != 0) {
  93                 DEBUG(DEBUG_ERR, ("srvid_init() failed, ret=%d\n", ret));
  94                 talloc_free(client);
  95                 tevent_req_error(req, ret);
  96                 return tevent_req_post(req, ev);
  97         }
  98
  99         ret = srvid_init(client, &client->tunnels);
 100         if (ret != 0) {
 101                 DEBUG(DEBUG_ERR, ("srvid_init() failed, ret=%d\n", ret));
 102                 talloc_free(client);
 103                 tevent_req_error(req, ret);
 104                 return tevent_req_post(req, ev);
 105         }
 106
 107         memset(&addr, 0, sizeof(addr));
 108         addr.sun_family = AF_UNIX;
 109         len = strlcpy(addr.sun_path, sockpath, sizeof(addr.sun_path));
 110         if (len != strlen(sockpath)) {
 111                 D_ERR("socket path too long, len=%zu\n", strlen(sockpath));
 112                 talloc_free(client);
 113                 tevent_req_error(req, ENAMETOOLONG);
 114                 return tevent_req_post(req, ev);
 115         }
 116
 117         client->fd = socket(AF_UNIX, SOCK_STREAM, 0);
 118         if (client->fd == -1) {
 119                 ret = errno;
 120                 D_ERR("socket() failed, errno=%d\n", ret);
 121                 talloc_free(client);
 122                 tevent_req_error(req, ret);
 123                 return tevent_req_post(req, ev);
 124         }
 125
 126         ret = connect(client->fd, (struct sockaddr *)&addr, sizeof(addr));
 127         if (ret == -1) {
 128                 ret = errno;
 129                 DEBUG(DEBUG_ERR, ("connect() failed, errno=%d\n", ret));
 130                 close(client->fd);
 131                 talloc_free(client);
 132                 tevent_req_error(req, ret);
 133                 return tevent_req_post(req, ev);
 134         }
 135
 136         ret = comm_setup(client, ev, client->fd, client_read_handler, client,
 137                          client_dead_handler, client, &client->comm);
 138         if (ret != 0) {
 139                 DEBUG(DEBUG_ERR, ("comm_setup() failed, ret=%d\n", ret));
 140                 close(client->fd);
 141                 talloc_free(client);
 142                 tevent_req_error(req, ret);
 143                 return tevent_req_post(req, ev);
 144         }
 145
 146         client->pnn = CTDB_UNKNOWN_PNN;
 147
 148         talloc_set_destructor(client, ctdb_client_context_destructor);
 149
 150         state->client = client;
 151
 152         ctdb_req_control_get_pnn(&request);
 153         subreq = ctdb_client_control_send(state, ev, client,
 154                                           CTDB_CURRENT_NODE,
 155                                           tevent_timeval_zero(),
 156                                           &request);
 157         if (tevent_req_nomem(subreq, req)) {
 158                 TALLOC_FREE(state->client);
 159                 return tevent_req_post(req, ev);
 160         }
 161         tevent_req_set_callback(subreq, ctdb_client_init_done, req);
 162
 163         return req;
 164 }
 165
 166 static int ctdb_client_context_destructor(struct ctdb_client_context *client)
 167 {
 168         if (client->fd != -1) {
 169                 close(client->fd);
 170                 client->fd = -1;
 171         }
 172         return 0;
 173 }
 174
 175 static void ctdb_client_init_done(struct tevent_req *subreq)
 176 {
 177         struct tevent_req *req = tevent_req_callback_data(
 178                 subreq, struct tevent_req);
 179         struct ctdb_client_init_state *state = tevent_req_data(
 180                 req, struct ctdb_client_init_state);
 181         struct ctdb_reply_control *reply;
 182         int ret;
 183         bool status;
 184
 185         status = ctdb_client_control_recv(subreq, &ret, state, &reply);
 186         TALLOC_FREE(subreq);
 187         if (! status) {
 188                 tevent_req_error(req, ret);
 189                 return;
 190         }
 191
 192         ret = ctdb_reply_control_get_pnn(reply, &state->client->pnn);
 193         if (ret != 0) {
 194                 tevent_req_error(req, ret);
 195                 return;
 196         }
 197
 198         tevent_req_done(req);
 199 }
 200
 201 bool ctdb_client_init_recv(struct tevent_req *req, int *perr,
 202                            TALLOC_CTX *mem_ctx,
 203                            struct ctdb_client_context **result)
 204 {
 205         struct ctdb_client_init_state *state = tevent_req_data(
 206                 req, struct ctdb_client_init_state);
 207         int ret;
 208
 209         if (tevent_req_is_unix_error(req, &ret)) {
 210                 if (perr != NULL) {
 211                         *perr = ret;
 212                 }
 213                 return false;
 214         }
 215
 216         *result = talloc_steal(mem_ctx, state->client);
 217         return true;
 218 }
 219
 220
 221 int ctdb_client_init(TALLOC_CTX *mem_ctx, struct tevent_context *ev,
 222                      const char *sockpath, struct ctdb_client_context **out)
 223 {
 224         struct tevent_req *req;
 225         int ret;
 226         bool status;
 227
 228         req = ctdb_client_init_send(mem_ctx, ev, sockpath);
 229         if (req == NULL) {
 230                 return ENOMEM;
 231         }
 232
 233         tevent_req_poll(req, ev);
 234
 235         status = ctdb_client_init_recv(req, &ret, mem_ctx, out);
 236         TALLOC_FREE(req);
 237         if (! status) {
 238                 return ret;
 239         }
 240
 241         return 0;
 242 }
 243
 244 static void client_read_handler(uint8_t *buf, size_t buflen,
 245                                 void *private_data)
 246 {
 247         struct ctdb_client_context *client = talloc_get_type_abort(
 248                 private_data, struct ctdb_client_context);
 249         struct ctdb_req_header hdr;
 250         size_t np;
 251         int ret;
 252
 253         ret = ctdb_req_header_pull(buf, buflen, &hdr, &np);
 254         if (ret != 0) {
 255                 DEBUG(DEBUG_WARNING, ("invalid header, ret=%d\n", ret));
 256                 return;
 257         }
 258
 259         if (buflen != hdr.length) {
 260                 DEBUG(DEBUG_WARNING, ("packet size mismatch %zu != %d\n",
 261                                       buflen, hdr.length));
 262                 return;
 263         }
 264
 265         ret = ctdb_req_header_verify(&hdr, 0);
 266         if (ret != 0) {
 267                 DEBUG(DEBUG_WARNING, ("invalid header, ret=%d\n", ret));
 268                 return;
 269         }
 270
 271         switch (hdr.operation) {
 272         case CTDB_REPLY_CALL:
 273                 ctdb_client_reply_call(client, buf, buflen, hdr.reqid);
 274                 break;
 275
 276         case CTDB_REQ_MESSAGE:
 277                 ctdb_client_req_message(client, buf, buflen, hdr.reqid);
 278                 break;
 279
 280         case CTDB_REPLY_CONTROL:
 281                 ctdb_client_reply_control(client, buf, buflen, hdr.reqid);
 282                 break;
 283
 284         case CTDB_REQ_TUNNEL:
 285                 ctdb_client_req_tunnel(client, buf, buflen, hdr.reqid);
 286                 break;
 287
 288         default:
 289                 break;
 290         }
 291 }
 292
 293 static void client_dead_handler(void *private_data)
 294 {
 295         struct ctdb_client_context *client = talloc_get_type_abort(
 296                 private_data, struct ctdb_client_context);
 297         ctdb_client_callback_func_t callback = client->callback;
 298         void *callback_data = client->private_data;
 299
 300         if (callback != NULL) {
 301                 callback(callback_data);
 302                 return;
 303         }
 304
 305         DEBUG(DEBUG_NOTICE, ("connection to daemon closed, exiting\n"));
 306         exit(1);
 307 }
 308
 309 void ctdb_client_set_disconnect_callback(struct ctdb_client_context *client,
 310                                          ctdb_client_callback_func_t callback,
 311                                          void *private_data)
 312 {
 313         client->callback = callback;
 314         client->private_data = private_data;
 315 }
 316
 317 uint32_t ctdb_client_pnn(struct ctdb_client_context *client)
 318 {
 319         return client->pnn;
 320 }
 321
 322 void ctdb_client_wait(struct tevent_context *ev, bool *done)
 323 {
 324         while (! (*done)) {
 325                 tevent_loop_once(ev);
 326         }
 327 }
 328
 329 static void ctdb_client_wait_timeout_handler(struct tevent_context *ev,
 330                                              struct tevent_timer *te,
 331                                              struct timeval t,
 332                                              void *private_data)
 333 {
 334         bool *timed_out = (bool *)private_data;
 335
 336         *timed_out = true;
 337 }
 338
 339 int ctdb_client_wait_timeout(struct tevent_context *ev, bool *done,
 340                              struct timeval timeout)
 341 {
 342         TALLOC_CTX *mem_ctx;
 343         struct tevent_timer *timer;
 344         bool timed_out = false;
 345
 346         mem_ctx = talloc_new(ev);
 347         if (mem_ctx == NULL) {
 348                 return ENOMEM;
 349         }
 350
 351         timer = tevent_add_timer(ev, mem_ctx, timeout,
 352                                  ctdb_client_wait_timeout_handler,
 353                                  &timed_out);
 354         if (timer == NULL) {
 355                 talloc_free(mem_ctx);
 356                 return ENOMEM;
 357         }
 358
 359         while (! (*done) && ! timed_out) {
 360                 tevent_loop_once(ev);
 361         }
 362
 363         talloc_free(mem_ctx);
 364
 365         if (timed_out) {
 366                 return ETIMEDOUT;
 367         }
 368
 369         return 0;
 370 }
 371
 372 struct ctdb_recovery_wait_state {
 373         struct tevent_context *ev;
 374         struct ctdb_client_context *client;
 375 };
 376
 377 static void ctdb_recovery_wait_recmode(struct tevent_req *subreq);
 378 static void ctdb_recovery_wait_retry(struct tevent_req *subreq);
 379
 380 struct tevent_req *ctdb_recovery_wait_send(TALLOC_CTX *mem_ctx,
 381                                            struct tevent_context *ev,
 382                                            struct ctdb_client_context *client)
 383 {
 384         struct tevent_req *req, *subreq;
 385         struct ctdb_recovery_wait_state *state;
 386         struct ctdb_req_control request;
 387
 388         req = tevent_req_create(mem_ctx, &state,
 389                                 struct ctdb_recovery_wait_state);
 390         if (req == NULL) {
 391                 return NULL;
 392         }
 393
 394         state->ev = ev;
 395         state->client = client;
 396
 397         ctdb_req_control_get_recmode(&request);
 398         subreq = ctdb_client_control_send(state, ev, client, client->pnn,
 399                                           tevent_timeval_zero(), &request);
 400         if (tevent_req_nomem(subreq, req)) {
 401                 return tevent_req_post(req, ev);
 402         }
 403         tevent_req_set_callback(subreq, ctdb_recovery_wait_recmode, req);
 404
 405         return req;
 406 }
 407
 408 static void ctdb_recovery_wait_recmode(struct tevent_req *subreq)
 409 {
 410         struct tevent_req *req = tevent_req_callback_data(
 411                 subreq, struct tevent_req);
 412         struct ctdb_recovery_wait_state *state = tevent_req_data(
 413                 req, struct ctdb_recovery_wait_state);
 414         struct ctdb_reply_control *reply;
 415         int recmode;
 416         int ret;
 417         bool status;
 418
 419         status = ctdb_client_control_recv(subreq, &ret, state, &reply);
 420         TALLOC_FREE(subreq);
 421         if (! status) {
 422                 tevent_req_error(req, ret);
 423                 return;
 424         }
 425
 426         ret = ctdb_reply_control_get_recmode(reply, &recmode);
 427         if (ret != 0) {
 428                 tevent_req_error(req, ret);
 429                 return;
 430         }
 431
 432         if (recmode == CTDB_RECOVERY_NORMAL) {
 433                 tevent_req_done(req);
 434                 return;
 435         }
 436
 437         subreq = tevent_wakeup_send(state, state->ev,
 438                                     tevent_timeval_current_ofs(1, 0));
 439         if (tevent_req_nomem(subreq, req)) {
 440                 return;
 441         }
 442         tevent_req_set_callback(subreq, ctdb_recovery_wait_retry, req);
 443 }
 444
 445 static void ctdb_recovery_wait_retry(struct tevent_req *subreq)
 446 {
 447         struct tevent_req *req = tevent_req_callback_data(
 448                 subreq, struct tevent_req);
 449         struct ctdb_recovery_wait_state *state = tevent_req_data(
 450                 req, struct ctdb_recovery_wait_state);
 451         struct ctdb_req_control request;
 452         bool status;
 453
 454         status = tevent_wakeup_recv(subreq);
 455         TALLOC_FREE(subreq);
 456         if (! status) {
 457                 tevent_req_error(req, ENOMEM);
 458                 return;
 459         }
 460
 461         ctdb_req_control_get_recmode(&request);
 462         subreq = ctdb_client_control_send(state, state->ev, state->client,
 463                                           state->client->pnn,
 464                                           tevent_timeval_zero(), &request);
 465         if (tevent_req_nomem(subreq, req)) {
 466                 return;
 467         }
 468         tevent_req_set_callback(subreq, ctdb_recovery_wait_recmode, req);
 469 }
 470
 471 bool ctdb_recovery_wait_recv(struct tevent_req *req, int *perr)
 472 {
 473         int err;
 474
 475         if (tevent_req_is_unix_error(req, &err)) {
 476                 if (perr != NULL) {
 477                         *perr = err;
 478                 }
 479                 return false;
 480         }
 481
 482         return true;
 483 }
 484
 485 bool ctdb_recovery_wait(struct tevent_context *ev,
 486                         struct ctdb_client_context *client)
 487 {
 488         TALLOC_CTX *mem_ctx;
 489         struct tevent_req *req;
 490         bool status;
 491
 492         mem_ctx = talloc_new(client);
 493         if (mem_ctx == NULL) {
 494                 return false;
 495         }
 496
 497         req = ctdb_recovery_wait_send(mem_ctx, ev, client);
 498         if (req == NULL) {
 499                 return false;
 500         }
 501
 502         tevent_req_poll(req, ev);
 503
 504         status = ctdb_recovery_wait_recv(req, NULL);
 505
 506         talloc_free(mem_ctx);
 507         return status;
 508 }