source3/lib/ctdbd_conn.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba internal messaging functions
   4    Copyright (C) 2007 by Volker Lendecke
   5    Copyright (C) 2007 by Andrew Tridgell
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22
  23 #ifdef CLUSTER_SUPPORT
  24
  25 #include "librpc/gen_ndr/messaging.h"
  26 #include "librpc/gen_ndr/ndr_messaging.h"
  27
  28 /* paths to these include files come from --with-ctdb= in configure */
  29 #include "ctdb.h"
  30 #include "ctdb_private.h"
  31
  32 struct ctdbd_connection {
  33         struct messaging_context *msg_ctx;
  34         uint32 reqid;
  35         uint32 our_vnn;
  36         uint64 rand_srvid;
  37         struct packet_context *pkt;
  38         struct fd_event *fde;
  39
  40         void (*release_ip_handler)(const char *ip_addr, void *private_data);
  41         void *release_ip_priv;
  42 };
  43
  44 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
  45                               uint32_t vnn, uint32 opcode,
  46                               uint64_t srvid, uint32_t flags, TDB_DATA data,
  47                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
  48                               int *cstatus);
  49
  50 /*
  51  * exit on fatal communications errors with the ctdbd daemon
  52  */
  53 static void cluster_fatal(const char *why)
  54 {
  55         DEBUG(0,("cluster fatal event: %s - exiting immediately\n", why));
  56         /* we don't use smb_panic() as we don't want to delay to write
  57            a core file. We need to release this process id immediately
  58            so that someone else can take over without getting sharing
  59            violations */
  60         _exit(0);
  61 }
  62
  63 /*
  64  *
  65  */
  66 static void ctdb_packet_dump(struct ctdb_req_header *hdr)
  67 {
  68         if (DEBUGLEVEL < 10) {
  69                 return;
  70         }
  71         DEBUGADD(10, ("len=%d, magic=%x, vers=%d, gen=%d, op=%d, reqid=%d\n",
  72                       (int)hdr->length, (int)hdr->ctdb_magic,
  73                       (int)hdr->ctdb_version, (int)hdr->generation,
  74                       (int)hdr->operation, (int)hdr->reqid));
  75 }
  76
  77 /*
  78  * Register a srvid with ctdbd
  79  */
  80 static NTSTATUS register_with_ctdbd(struct ctdbd_connection *conn,
  81                                     uint64_t srvid)
  82 {
  83
  84         int cstatus;
  85         return ctdbd_control(conn, CTDB_CURRENT_NODE,
  86                              CTDB_CONTROL_REGISTER_SRVID, srvid, 0,
  87                              tdb_null, NULL, NULL, &cstatus);
  88 }
  89
  90 /*
  91  * get our vnn from the cluster
  92  */
  93 static NTSTATUS get_cluster_vnn(struct ctdbd_connection *conn, uint32 *vnn)
  94 {
  95         int32_t cstatus=-1;
  96         NTSTATUS status;
  97         status = ctdbd_control(conn,
  98                                CTDB_CURRENT_NODE, CTDB_CONTROL_GET_PNN, 0, 0,
  99                                tdb_null, NULL, NULL, &cstatus);
 100         if (!NT_STATUS_IS_OK(status)) {
 101                 cluster_fatal("ctdbd_control failed\n");
 102         }
 103         *vnn = (uint32_t)cstatus;
 104         return status;
 105 }
 106
 107 uint32 ctdbd_vnn(const struct ctdbd_connection *conn)
 108 {
 109         return conn->our_vnn;
 110 }
 111
 112 /*
 113  * Get us a ctdb connection
 114  */
 115
 116 static NTSTATUS ctdbd_connect(TALLOC_CTX *mem_ctx,
 117                               struct packet_context **presult)
 118 {
 119         struct packet_context *result;
 120         const char *sockname = lp_ctdbd_socket();
 121         struct sockaddr_un addr;
 122         int fd;
 123
 124         if (!sockname || !*sockname) {
 125                 sockname = CTDB_PATH;
 126         }
 127
 128         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 129         if (fd == -1) {
 130                 DEBUG(3, ("Could not create socket: %s\n", strerror(errno)));
 131                 return map_nt_error_from_unix(errno);
 132         }
 133
 134         ZERO_STRUCT(addr);
 135         addr.sun_family = AF_UNIX;
 136         strncpy(addr.sun_path, sockname, sizeof(addr.sun_path));
 137
 138         if (sys_connect(fd, (struct sockaddr *)&addr) == -1) {
 139                 DEBUG(1, ("connect(%s) failed: %s\n", sockname,
 140                           strerror(errno)));
 141                 close(fd);
 142                 return map_nt_error_from_unix(errno);
 143         }
 144
 145         if (!(result = packet_init(mem_ctx, fd))) {
 146                 close(fd);
 147                 return NT_STATUS_NO_MEMORY;
 148         }
 149
 150         *presult = result;
 151         return NT_STATUS_OK;
 152 }
 153
 154 /*
 155  * Do we have a complete ctdb packet in the queue?
 156  */
 157
 158 static bool ctdb_req_complete(const uint8_t *buf, size_t available,
 159                               size_t *length,
 160                               void *private_data)
 161 {
 162         uint32 msglen;
 163
 164         if (available < sizeof(msglen)) {
 165                 return False;
 166         }
 167
 168         msglen = *((uint32 *)buf);
 169
 170         DEBUG(10, ("msglen = %d\n", msglen));
 171
 172         if (msglen < sizeof(struct ctdb_req_header)) {
 173                 DEBUG(0, ("Got invalid msglen: %d, expected at least %d for "
 174                           "the req_header\n", (int)msglen,
 175                           (int)sizeof(struct ctdb_req_header)));
 176                 cluster_fatal("ctdbd protocol error\n");
 177         }
 178
 179         if (available < msglen) {
 180                 return false;
 181         }
 182
 183         *length = msglen;
 184         return true;
 185 }
 186
 187 /*
 188  * State necessary to defer an incoming message while we are waiting for a
 189  * ctdb reply.
 190  */
 191
 192 struct deferred_msg_state {
 193         struct messaging_context *msg_ctx;
 194         struct messaging_rec *rec;
 195 };
 196
 197 /*
 198  * Timed event handler for the deferred message
 199  */
 200
 201 static void deferred_message_dispatch(struct event_context *event_ctx,
 202                                       struct timed_event *te,
 203                                       struct timeval now,
 204                                       void *private_data)
 205 {
 206         struct deferred_msg_state *state = talloc_get_type_abort(
 207                 private_data, struct deferred_msg_state);
 208
 209         messaging_dispatch_rec(state->msg_ctx, state->rec);
 210         TALLOC_FREE(state);
 211         TALLOC_FREE(te);
 212 }
 213
 214 struct req_pull_state {
 215         TALLOC_CTX *mem_ctx;
 216         DATA_BLOB req;
 217 };
 218
 219 /*
 220  * Pull a ctdb request out of the incoming packet queue
 221  */
 222
 223 static NTSTATUS ctdb_req_pull(uint8_t *buf, size_t length,
 224                               void *private_data)
 225 {
 226         struct req_pull_state *state = (struct req_pull_state *)private_data;
 227
 228         state->req.data = talloc_move(state->mem_ctx, &buf);
 229         state->req.length = length;
 230         return NT_STATUS_OK;
 231 }
 232
 233 /*
 234  * Fetch a messaging_rec from an incoming ctdb style message
 235  */
 236
 237 static struct messaging_rec *ctdb_pull_messaging_rec(TALLOC_CTX *mem_ctx,
 238                                                      size_t overall_length,
 239                                                      struct ctdb_req_message *msg)
 240 {
 241         struct messaging_rec *result;
 242         DATA_BLOB blob;
 243         enum ndr_err_code ndr_err;
 244
 245         if ((overall_length < offsetof(struct ctdb_req_message, data))
 246             || (overall_length
 247                 < offsetof(struct ctdb_req_message, data) + msg->datalen)) {
 248
 249                 cluster_fatal("got invalid msg length");
 250         }
 251
 252         if (!(result = TALLOC_P(mem_ctx, struct messaging_rec))) {
 253                 DEBUG(0, ("talloc failed\n"));
 254                 return NULL;
 255         }
 256
 257         blob = data_blob_const(msg->data, msg->datalen);
 258
 259         ndr_err = ndr_pull_struct_blob(
 260                 &blob, result, NULL, result,
 261                 (ndr_pull_flags_fn_t)ndr_pull_messaging_rec);
 262
 263         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 264                 DEBUG(0, ("ndr_pull_struct_blob failed: %s\n",
 265                           ndr_errstr(ndr_err)));
 266                 TALLOC_FREE(result);
 267                 return NULL;
 268         }
 269
 270         if (DEBUGLEVEL >= 10) {
 271                 DEBUG(10, ("ctdb_pull_messaging_rec:\n"));
 272                 NDR_PRINT_DEBUG(messaging_rec, result);
 273         }
 274
 275         return result;
 276 }
 277
 278 static NTSTATUS ctdb_packet_fd_read_sync(struct packet_context *ctx)
 279 {
 280         struct timeval timeout;
 281         struct timeval *ptimeout;
 282
 283         timeout = timeval_set(lp_ctdb_timeout(), 0);
 284         ptimeout = (timeout.tv_sec != 0) ? &timeout : NULL;
 285
 286         return packet_fd_read_sync(ctx, ptimeout);
 287 }
 288
 289 /*
 290  * Read a full ctdbd request. If we have a messaging context, defer incoming
 291  * messages that might come in between.
 292  */
 293
 294 static NTSTATUS ctdb_read_req(struct ctdbd_connection *conn, uint32 reqid,
 295                               TALLOC_CTX *mem_ctx, void *result)
 296 {
 297         struct ctdb_req_header *hdr;
 298         struct req_pull_state state;
 299         NTSTATUS status;
 300
 301  again:
 302
 303         status = ctdb_packet_fd_read_sync(conn->pkt);
 304
 305         if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_BUSY)) {
 306                 /* EAGAIN */
 307                 goto again;
 308         } else if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 309                 /* EAGAIN */
 310                 goto again;
 311         }
 312
 313         if (!NT_STATUS_IS_OK(status)) {
 314                 DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
 315                 cluster_fatal("ctdbd died\n");
 316         }
 317
 318  next_pkt:
 319
 320         ZERO_STRUCT(state);
 321         state.mem_ctx = mem_ctx;
 322
 323         if (!packet_handler(conn->pkt, ctdb_req_complete, ctdb_req_pull,
 324                             &state, &status)) {
 325                 /*
 326                  * Not enough data
 327                  */
 328                 DEBUG(10, ("not enough data from ctdb socket, retrying\n"));
 329                 goto again;
 330         }
 331
 332         if (!NT_STATUS_IS_OK(status)) {
 333                 DEBUG(0, ("Could not read packet: %s\n", nt_errstr(status)));
 334                 cluster_fatal("ctdbd died\n");
 335         }
 336
 337         hdr = (struct ctdb_req_header *)state.req.data;
 338
 339         DEBUG(10, ("Received ctdb packet\n"));
 340         ctdb_packet_dump(hdr);
 341
 342         if (hdr->operation == CTDB_REQ_MESSAGE) {
 343                 struct timed_event *evt;
 344                 struct deferred_msg_state *msg_state;
 345                 struct ctdb_req_message *msg = (struct ctdb_req_message *)hdr;
 346
 347                 if (conn->msg_ctx == NULL) {
 348                         DEBUG(1, ("Got a message without having a msg ctx, "
 349                                   "dropping msg %llu\n",
 350                                   (long long unsigned)msg->srvid));
 351                         goto next_pkt;
 352                 }
 353
 354                 if ((conn->release_ip_handler != NULL)
 355                     && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 356                         /* must be dispatched immediately */
 357                         DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 358                         conn->release_ip_handler((const char *)msg->data,
 359                                                  conn->release_ip_priv);
 360                         TALLOC_FREE(hdr);
 361                         goto next_pkt;
 362                 }
 363
 364                 if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 365                     || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)) {
 366
 367                         DEBUG(1, ("ctdb_read_req: Got %s message\n",
 368                                   (msg->srvid == CTDB_SRVID_RECONFIGURE)
 369                                   ? "cluster reconfigure" : "SAMBA_NOTIFY"));
 370
 371                         messaging_send(conn->msg_ctx, procid_self(),
 372                                        MSG_SMB_BRL_VALIDATE, &data_blob_null);
 373                         messaging_send(conn->msg_ctx, procid_self(),
 374                                        MSG_DBWRAP_G_LOCK_RETRY,
 375                                        &data_blob_null);
 376                         TALLOC_FREE(hdr);
 377                         goto next_pkt;
 378                 }
 379
 380                 if (!(msg_state = TALLOC_P(talloc_autofree_context(), struct deferred_msg_state))) {
 381                         DEBUG(0, ("talloc failed\n"));
 382                         TALLOC_FREE(hdr);
 383                         goto next_pkt;
 384                 }
 385
 386                 if (!(msg_state->rec = ctdb_pull_messaging_rec(
 387                               msg_state, state.req.length, msg))) {
 388                         DEBUG(0, ("ctdbd_pull_messaging_rec failed\n"));
 389                         TALLOC_FREE(msg_state);
 390                         TALLOC_FREE(hdr);
 391                         goto next_pkt;
 392                 }
 393
 394                 TALLOC_FREE(hdr);
 395
 396                 msg_state->msg_ctx = conn->msg_ctx;
 397
 398                 /*
 399                  * We're waiting for a call reply, but an async message has
 400                  * crossed. Defer dispatching to the toplevel event loop.
 401                  */
 402                 evt = event_add_timed(conn->msg_ctx->event_ctx,
 403                                       conn->msg_ctx->event_ctx,
 404                                       timeval_zero(),
 405                                       deferred_message_dispatch,
 406                                       msg_state);
 407                 if (evt == NULL) {
 408                         DEBUG(0, ("event_add_timed failed\n"));
 409                         TALLOC_FREE(msg_state);
 410                         TALLOC_FREE(hdr);
 411                         goto next_pkt;
 412                 }
 413
 414                 goto next_pkt;
 415         }
 416
 417         if (hdr->reqid != reqid) {
 418                 /* we got the wrong reply */
 419                 DEBUG(0,("Discarding mismatched ctdb reqid %u should have "
 420                          "been %u\n", hdr->reqid, reqid));
 421                 TALLOC_FREE(hdr);
 422                 goto again;
 423         }
 424
 425         *((void **)result) = talloc_move(mem_ctx, &hdr);
 426
 427         return NT_STATUS_OK;
 428 }
 429
 430 /*
 431  * Get us a ctdbd connection
 432  */
 433
 434 NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
 435                                struct ctdbd_connection **pconn)
 436 {
 437         struct ctdbd_connection *conn;
 438         NTSTATUS status;
 439
 440         if (!(conn = TALLOC_ZERO_P(mem_ctx, struct ctdbd_connection))) {
 441                 DEBUG(0, ("talloc failed\n"));
 442                 return NT_STATUS_NO_MEMORY;
 443         }
 444
 445         status = ctdbd_connect(conn, &conn->pkt);
 446
 447         if (!NT_STATUS_IS_OK(status)) {
 448                 DEBUG(10, ("ctdbd_connect failed: %s\n", nt_errstr(status)));
 449                 goto fail;
 450         }
 451
 452         status = get_cluster_vnn(conn, &conn->our_vnn);
 453
 454         if (!NT_STATUS_IS_OK(status)) {
 455                 DEBUG(10, ("get_cluster_vnn failed: %s\n", nt_errstr(status)));
 456                 goto fail;
 457         }
 458
 459         generate_random_buffer((unsigned char *)&conn->rand_srvid,
 460                                sizeof(conn->rand_srvid));
 461
 462         status = register_with_ctdbd(conn, conn->rand_srvid);
 463
 464         if (!NT_STATUS_IS_OK(status)) {
 465                 DEBUG(5, ("Could not register random srvid: %s\n",
 466                           nt_errstr(status)));
 467                 goto fail;
 468         }
 469
 470         *pconn = conn;
 471         return NT_STATUS_OK;
 472
 473  fail:
 474         TALLOC_FREE(conn);
 475         return status;
 476 }
 477
 478 /*
 479  * Get us a ctdbd connection and register us as a process
 480  */
 481
 482 NTSTATUS ctdbd_messaging_connection(TALLOC_CTX *mem_ctx,
 483                                     struct ctdbd_connection **pconn)
 484 {
 485         struct ctdbd_connection *conn;
 486         NTSTATUS status;
 487
 488         status = ctdbd_init_connection(mem_ctx, &conn);
 489
 490         if (!NT_STATUS_IS_OK(status)) {
 491                 return status;
 492         }
 493
 494         status = register_with_ctdbd(conn, (uint64_t)sys_getpid());
 495         if (!NT_STATUS_IS_OK(status)) {
 496                 goto fail;
 497         }
 498
 499         status = register_with_ctdbd(conn, MSG_SRVID_SAMBA);
 500         if (!NT_STATUS_IS_OK(status)) {
 501                 goto fail;
 502         }
 503
 504         status = register_with_ctdbd(conn, CTDB_SRVID_SAMBA_NOTIFY);
 505         if (!NT_STATUS_IS_OK(status)) {
 506                 goto fail;
 507         }
 508
 509         *pconn = conn;
 510         return NT_STATUS_OK;
 511
 512  fail:
 513         TALLOC_FREE(conn);
 514         return status;
 515 }
 516
 517 struct messaging_context *ctdb_conn_msg_ctx(struct ctdbd_connection *conn)
 518 {
 519         return conn->msg_ctx;
 520 }
 521
 522 /*
 523  * Packet handler to receive and handle a ctdb message
 524  */
 525 static NTSTATUS ctdb_handle_message(uint8_t *buf, size_t length,
 526                                     void *private_data)
 527 {
 528         struct ctdbd_connection *conn = talloc_get_type_abort(
 529                 private_data, struct ctdbd_connection);
 530         struct ctdb_req_message *msg;
 531         struct messaging_rec *msg_rec;
 532
 533         msg = (struct ctdb_req_message *)buf;
 534
 535         if (msg->hdr.operation != CTDB_REQ_MESSAGE) {
 536                 DEBUG(0, ("Received async msg of type %u, discarding\n",
 537                           msg->hdr.operation));
 538                 TALLOC_FREE(buf);
 539                 return NT_STATUS_INVALID_PARAMETER;
 540         }
 541
 542         if ((conn->release_ip_handler != NULL)
 543             && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 544                 /* must be dispatched immediately */
 545                 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 546                 conn->release_ip_handler((const char *)msg->data,
 547                                          conn->release_ip_priv);
 548                 TALLOC_FREE(buf);
 549                 return NT_STATUS_OK;
 550         }
 551
 552         SMB_ASSERT(conn->msg_ctx != NULL);
 553
 554         if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 555             || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)){
 556                 DEBUG(0,("Got cluster reconfigure message\n"));
 557                 /*
 558                  * when the cluster is reconfigured or someone of the
 559                  * family has passed away (SAMBA_NOTIFY), we need to
 560                  * clean the brl database
 561                  */
 562                 messaging_send(conn->msg_ctx, procid_self(),
 563                                MSG_SMB_BRL_VALIDATE, &data_blob_null);
 564
 565                 messaging_send(conn->msg_ctx, procid_self(),
 566                                MSG_DBWRAP_G_LOCK_RETRY,
 567                                &data_blob_null);
 568
 569                 TALLOC_FREE(buf);
 570                 return NT_STATUS_OK;
 571         }
 572
 573         /* only messages to our pid or the broadcast are valid here */
 574         if (msg->srvid != sys_getpid() && msg->srvid != MSG_SRVID_SAMBA) {
 575                 DEBUG(0,("Got unexpected message with srvid=%llu\n",
 576                          (unsigned long long)msg->srvid));
 577                 TALLOC_FREE(buf);
 578                 return NT_STATUS_OK;
 579         }
 580
 581         if (!(msg_rec = ctdb_pull_messaging_rec(NULL, length, msg))) {
 582                 DEBUG(10, ("ctdb_pull_messaging_rec failed\n"));
 583                 TALLOC_FREE(buf);
 584                 return NT_STATUS_NO_MEMORY;
 585         }
 586
 587         messaging_dispatch_rec(conn->msg_ctx, msg_rec);
 588
 589         TALLOC_FREE(msg_rec);
 590         TALLOC_FREE(buf);
 591         return NT_STATUS_OK;
 592 }
 593
 594 /*
 595  * The ctdbd socket is readable asynchronuously
 596  */
 597
 598 static void ctdbd_socket_handler(struct event_context *event_ctx,
 599                                  struct fd_event *event,
 600                                  uint16 flags,
 601                                  void *private_data)
 602 {
 603         struct ctdbd_connection *conn = talloc_get_type_abort(
 604                 private_data, struct ctdbd_connection);
 605
 606         NTSTATUS status;
 607
 608         status = packet_fd_read(conn->pkt);
 609
 610         if (!NT_STATUS_IS_OK(status)) {
 611                 DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
 612                 cluster_fatal("ctdbd died\n");
 613         }
 614
 615         while (packet_handler(conn->pkt, ctdb_req_complete,
 616                               ctdb_handle_message, conn, &status)) {
 617                 if (!NT_STATUS_IS_OK(status)) {
 618                         DEBUG(10, ("could not handle incoming message: %s\n",
 619                                    nt_errstr(status)));
 620                 }
 621         }
 622 }
 623
 624 /*
 625  * Prepare a ctdbd connection to receive messages
 626  */
 627
 628 NTSTATUS ctdbd_register_msg_ctx(struct ctdbd_connection *conn,
 629                                 struct messaging_context *msg_ctx)
 630 {
 631         SMB_ASSERT(conn->msg_ctx == NULL);
 632         SMB_ASSERT(conn->fde == NULL);
 633
 634         if (!(conn->fde = event_add_fd(msg_ctx->event_ctx, conn,
 635                                        packet_get_fd(conn->pkt),
 636                                        EVENT_FD_READ,
 637                                        ctdbd_socket_handler,
 638                                        conn))) {
 639                 DEBUG(0, ("event_add_fd failed\n"));
 640                 return NT_STATUS_NO_MEMORY;
 641         }
 642
 643         conn->msg_ctx = msg_ctx;
 644
 645         return NT_STATUS_OK;
 646 }
 647
 648 /*
 649  * Send a messaging message across a ctdbd
 650  */
 651
 652 NTSTATUS ctdbd_messaging_send(struct ctdbd_connection *conn,
 653                               uint32 dst_vnn, uint64 dst_srvid,
 654                               struct messaging_rec *msg)
 655 {
 656         struct ctdb_req_message r;
 657         TALLOC_CTX *mem_ctx;
 658         DATA_BLOB blob;
 659         NTSTATUS status;
 660         enum ndr_err_code ndr_err;
 661
 662         if (!(mem_ctx = talloc_init("ctdbd_messaging_send"))) {
 663                 DEBUG(0, ("talloc failed\n"));
 664                 return NT_STATUS_NO_MEMORY;
 665         }
 666
 667         ndr_err = ndr_push_struct_blob(
 668                 &blob, mem_ctx, NULL, msg,
 669                 (ndr_push_flags_fn_t)ndr_push_messaging_rec);
 670
 671         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 672                 DEBUG(0, ("ndr_push_struct_blob failed: %s\n",
 673                           ndr_errstr(ndr_err)));
 674                 status = ndr_map_error2ntstatus(ndr_err);
 675                 goto fail;
 676         }
 677
 678         r.hdr.length = offsetof(struct ctdb_req_message, data) + blob.length;
 679         r.hdr.ctdb_magic = CTDB_MAGIC;
 680         r.hdr.ctdb_version = CTDB_VERSION;
 681         r.hdr.generation = 1;
 682         r.hdr.operation  = CTDB_REQ_MESSAGE;
 683         r.hdr.destnode   = dst_vnn;
 684         r.hdr.srcnode    = conn->our_vnn;
 685         r.hdr.reqid      = 0;
 686         r.srvid          = dst_srvid;
 687         r.datalen        = blob.length;
 688
 689         DEBUG(10, ("ctdbd_messaging_send: Sending ctdb packet\n"));
 690         ctdb_packet_dump(&r.hdr);
 691
 692         status = packet_send(
 693                 conn->pkt, 2,
 694                 data_blob_const(&r, offsetof(struct ctdb_req_message, data)),
 695                 blob);
 696
 697         if (!NT_STATUS_IS_OK(status)) {
 698                 DEBUG(0, ("packet_send failed: %s\n", nt_errstr(status)));
 699                 goto fail;
 700         }
 701
 702         status = packet_flush(conn->pkt);
 703
 704         if (!NT_STATUS_IS_OK(status)) {
 705                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 706                 cluster_fatal("cluster dispatch daemon msg write error\n");
 707         }
 708
 709         status = NT_STATUS_OK;
 710  fail:
 711         TALLOC_FREE(mem_ctx);
 712         return status;
 713 }
 714
 715 /*
 716  * send/recv a generic ctdb control message
 717  */
 718 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
 719                               uint32_t vnn, uint32 opcode,
 720                               uint64_t srvid, uint32_t flags,
 721                               TDB_DATA data,
 722                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
 723                               int *cstatus)
 724 {
 725         struct ctdb_req_control req;
 726         struct ctdb_reply_control *reply = NULL;
 727         struct ctdbd_connection *new_conn = NULL;
 728         NTSTATUS status;
 729
 730         /* the samba3 ctdb code can't handle NOREPLY yet */
 731         flags &= ~CTDB_CTRL_FLAG_NOREPLY;
 732
 733         if (conn == NULL) {
 734                 status = ctdbd_init_connection(NULL, &new_conn);
 735
 736                 if (!NT_STATUS_IS_OK(status)) {
 737                         DEBUG(10, ("Could not init temp connection: %s\n",
 738                                    nt_errstr(status)));
 739                         goto fail;
 740                 }
 741
 742                 conn = new_conn;
 743         }
 744
 745         ZERO_STRUCT(req);
 746         req.hdr.length = offsetof(struct ctdb_req_control, data) + data.dsize;
 747         req.hdr.ctdb_magic   = CTDB_MAGIC;
 748         req.hdr.ctdb_version = CTDB_VERSION;
 749         req.hdr.operation    = CTDB_REQ_CONTROL;
 750         req.hdr.reqid        = ++conn->reqid;
 751         req.hdr.destnode     = vnn;
 752         req.opcode           = opcode;
 753         req.srvid            = srvid;
 754         req.datalen          = data.dsize;
 755
 756         DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
 757         ctdb_packet_dump(&req.hdr);
 758
 759         status = packet_send(
 760                 conn->pkt, 2,
 761                 data_blob_const(&req, offsetof(struct ctdb_req_control, data)),
 762                 data_blob_const(data.dptr, data.dsize));
 763
 764         if (!NT_STATUS_IS_OK(status)) {
 765                 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
 766                 goto fail;
 767         }
 768
 769         status = packet_flush(conn->pkt);
 770
 771         if (!NT_STATUS_IS_OK(status)) {
 772                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 773                 cluster_fatal("cluster dispatch daemon control write error\n");
 774         }
 775
 776         if (flags & CTDB_CTRL_FLAG_NOREPLY) {
 777                 TALLOC_FREE(new_conn);
 778                 return NT_STATUS_OK;
 779         }
 780
 781         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
 782
 783         if (!NT_STATUS_IS_OK(status)) {
 784                 DEBUG(10, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 785                 goto fail;
 786         }
 787
 788         if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
 789                 DEBUG(0, ("received invalid reply\n"));
 790                 goto fail;
 791         }
 792
 793         if (outdata) {
 794                 if (!(outdata->dptr = (uint8 *)talloc_memdup(
 795                               mem_ctx, reply->data, reply->datalen))) {
 796                         TALLOC_FREE(reply);
 797                         return NT_STATUS_NO_MEMORY;
 798                 }
 799                 outdata->dsize = reply->datalen;
 800         }
 801         if (cstatus) {
 802                 (*cstatus) = reply->status;
 803         }
 804
 805         status = NT_STATUS_OK;
 806
 807  fail:
 808         TALLOC_FREE(new_conn);
 809         TALLOC_FREE(reply);
 810         return status;
 811 }
 812
 813 /*
 814  * see if a remote process exists
 815  */
 816 bool ctdbd_process_exists(struct ctdbd_connection *conn, uint32 vnn, pid_t pid)
 817 {
 818         NTSTATUS status;
 819         TDB_DATA data;
 820         int32_t cstatus;
 821
 822         data.dptr = (uint8_t*)&pid;
 823         data.dsize = sizeof(pid);
 824
 825         status = ctdbd_control(conn, vnn, CTDB_CONTROL_PROCESS_EXISTS, 0, 0,
 826                                data, NULL, NULL, &cstatus);
 827         if (!NT_STATUS_IS_OK(status)) {
 828                 DEBUG(0, (__location__ " ctdb_control for process_exists "
 829                           "failed\n"));
 830                 return False;
 831         }
 832
 833         return cstatus == 0;
 834 }
 835
 836 /*
 837  * Get a db path
 838  */
 839 char *ctdbd_dbpath(struct ctdbd_connection *conn,
 840                    TALLOC_CTX *mem_ctx, uint32_t db_id)
 841 {
 842         NTSTATUS status;
 843         TDB_DATA data;
 844         int32_t cstatus;
 845
 846         data.dptr = (uint8_t*)&db_id;
 847         data.dsize = sizeof(db_id);
 848
 849         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 850                                CTDB_CONTROL_GETDBPATH, 0, 0, data,
 851                                mem_ctx, &data, &cstatus);
 852         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
 853                 DEBUG(0,(__location__ " ctdb_control for getdbpath failed\n"));
 854                 return NULL;
 855         }
 856
 857         return (char *)data.dptr;
 858 }
 859
 860 /*
 861  * attach to a ctdb database
 862  */
 863 NTSTATUS ctdbd_db_attach(struct ctdbd_connection *conn,
 864                          const char *name, uint32_t *db_id, int tdb_flags)
 865 {
 866         NTSTATUS status;
 867         TDB_DATA data;
 868         int32_t cstatus;
 869         bool persistent = (tdb_flags & TDB_CLEAR_IF_FIRST) == 0;
 870
 871         data.dptr = (uint8_t*)name;
 872         data.dsize = strlen(name)+1;
 873
 874         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 875                                persistent
 876                                ? CTDB_CONTROL_DB_ATTACH_PERSISTENT
 877                                : CTDB_CONTROL_DB_ATTACH,
 878                                0, 0, data, NULL, &data, &cstatus);
 879         if (!NT_STATUS_IS_OK(status)) {
 880                 DEBUG(0, (__location__ " ctdb_control for db_attach "
 881                           "failed: %s\n", nt_errstr(status)));
 882                 return status;
 883         }
 884
 885         if (cstatus != 0 || data.dsize != sizeof(uint32_t)) {
 886                 DEBUG(0,(__location__ " ctdb_control for db_attach failed\n"));
 887                 return NT_STATUS_INTERNAL_ERROR;
 888         }
 889
 890         *db_id = *(uint32_t *)data.dptr;
 891         talloc_free(data.dptr);
 892
 893         if (!(tdb_flags & TDB_SEQNUM)) {
 894                 return NT_STATUS_OK;
 895         }
 896
 897         data.dptr = (uint8_t *)db_id;
 898         data.dsize = sizeof(*db_id);
 899
 900         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 901                                CTDB_CONTROL_ENABLE_SEQNUM, 0, 0, data,
 902                                NULL, NULL, &cstatus);
 903         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
 904                 DEBUG(0,(__location__ " ctdb_control for enable seqnum "
 905                          "failed\n"));
 906                 return NT_STATUS_IS_OK(status) ? NT_STATUS_INTERNAL_ERROR :
 907                         status;
 908         }
 909
 910         return NT_STATUS_OK;
 911 }
 912
 913 /*
 914  * force the migration of a record to this node
 915  */
 916 NTSTATUS ctdbd_migrate(struct ctdbd_connection *conn, uint32 db_id,
 917                        TDB_DATA key)
 918 {
 919         struct ctdb_req_call req;
 920         struct ctdb_reply_call *reply;
 921         NTSTATUS status;
 922
 923         ZERO_STRUCT(req);
 924
 925         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
 926         req.hdr.ctdb_magic   = CTDB_MAGIC;
 927         req.hdr.ctdb_version = CTDB_VERSION;
 928         req.hdr.operation    = CTDB_REQ_CALL;
 929         req.hdr.reqid        = ++conn->reqid;
 930         req.flags            = CTDB_IMMEDIATE_MIGRATION;
 931         req.callid           = CTDB_NULL_FUNC;
 932         req.db_id            = db_id;
 933         req.keylen           = key.dsize;
 934
 935         DEBUG(10, ("ctdbd_migrate: Sending ctdb packet\n"));
 936         ctdb_packet_dump(&req.hdr);
 937
 938         status = packet_send(
 939                 conn->pkt, 2,
 940                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
 941                 data_blob_const(key.dptr, key.dsize));
 942
 943         if (!NT_STATUS_IS_OK(status)) {
 944                 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
 945                 return status;
 946         }
 947
 948         status = packet_flush(conn->pkt);
 949
 950         if (!NT_STATUS_IS_OK(status)) {
 951                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 952                 cluster_fatal("cluster dispatch daemon control write error\n");
 953         }
 954
 955         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
 956
 957         if (!NT_STATUS_IS_OK(status)) {
 958                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 959                 goto fail;
 960         }
 961
 962         if (reply->hdr.operation != CTDB_REPLY_CALL) {
 963                 DEBUG(0, ("received invalid reply\n"));
 964                 status = NT_STATUS_INTERNAL_ERROR;
 965                 goto fail;
 966         }
 967
 968         status = NT_STATUS_OK;
 969  fail:
 970
 971         TALLOC_FREE(reply);
 972         return status;
 973 }
 974
 975 /*
 976  * remotely fetch a record without locking it or forcing a migration
 977  */
 978 NTSTATUS ctdbd_fetch(struct ctdbd_connection *conn, uint32 db_id,
 979                      TDB_DATA key, TALLOC_CTX *mem_ctx, TDB_DATA *data)
 980 {
 981         struct ctdb_req_call req;
 982         struct ctdb_reply_call *reply;
 983         NTSTATUS status;
 984
 985         ZERO_STRUCT(req);
 986
 987         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
 988         req.hdr.ctdb_magic   = CTDB_MAGIC;
 989         req.hdr.ctdb_version = CTDB_VERSION;
 990         req.hdr.operation    = CTDB_REQ_CALL;
 991         req.hdr.reqid        = ++conn->reqid;
 992         req.flags            = 0;
 993         req.callid           = CTDB_FETCH_FUNC;
 994         req.db_id            = db_id;
 995         req.keylen           = key.dsize;
 996
 997         status = packet_send(
 998                 conn->pkt, 2,
 999                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
1000                 data_blob_const(key.dptr, key.dsize));
1001
1002         if (!NT_STATUS_IS_OK(status)) {
1003                 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
1004                 return status;
1005         }
1006
1007         status = packet_flush(conn->pkt);
1008
1009         if (!NT_STATUS_IS_OK(status)) {
1010                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
1011                 cluster_fatal("cluster dispatch daemon control write error\n");
1012         }
1013
1014         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
1015
1016         if (!NT_STATUS_IS_OK(status)) {
1017                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1018                 goto fail;
1019         }
1020
1021         if (reply->hdr.operation != CTDB_REPLY_CALL) {
1022                 DEBUG(0, ("received invalid reply\n"));
1023                 status = NT_STATUS_INTERNAL_ERROR;
1024                 goto fail;
1025         }
1026
1027         data->dsize = reply->datalen;
1028         if (data->dsize == 0) {
1029                 data->dptr = NULL;
1030                 goto done;
1031         }
1032
1033         data->dptr = (uint8 *)talloc_memdup(mem_ctx, &reply->data[0],
1034                                             reply->datalen);
1035         if (data->dptr == NULL) {
1036                 DEBUG(0, ("talloc failed\n"));
1037                 status = NT_STATUS_NO_MEMORY;
1038                 goto fail;
1039         }
1040
1041  done:
1042         status = NT_STATUS_OK;
1043  fail:
1044         TALLOC_FREE(reply);
1045         return status;
1046 }
1047
1048 struct ctdbd_traverse_state {
1049         void (*fn)(TDB_DATA key, TDB_DATA data, void *private_data);
1050         void *private_data;
1051 };
1052
1053 /*
1054  * Handle a traverse record coming in on the ctdbd connection
1055  */
1056
1057 static NTSTATUS ctdb_traverse_handler(uint8_t *buf, size_t length,
1058                                       void *private_data)
1059 {
1060         struct ctdbd_traverse_state *state =
1061                 (struct ctdbd_traverse_state *)private_data;
1062
1063         struct ctdb_req_message *m;
1064         struct ctdb_rec_data *d;
1065         TDB_DATA key, data;
1066
1067         m = (struct ctdb_req_message *)buf;
1068
1069         if (length < sizeof(*m) || m->hdr.length != length) {
1070                 DEBUG(0, ("Got invalid message of length %d\n", (int)length));
1071                 TALLOC_FREE(buf);
1072                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1073         }
1074
1075         d = (struct ctdb_rec_data *)&m->data[0];
1076         if (m->datalen < sizeof(uint32_t) || m->datalen != d->length) {
1077                 DEBUG(0, ("Got invalid traverse data of length %d\n",
1078                           (int)m->datalen));
1079                 TALLOC_FREE(buf);
1080                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1081         }
1082
1083         key.dsize = d->keylen;
1084         key.dptr  = &d->data[0];
1085         data.dsize = d->datalen;
1086         data.dptr = &d->data[d->keylen];
1087
1088         if (key.dsize == 0 && data.dsize == 0) {
1089                 /* end of traverse */
1090                 return NT_STATUS_END_OF_FILE;
1091         }
1092
1093         if (data.dsize < sizeof(struct ctdb_ltdb_header)) {
1094                 DEBUG(0, ("Got invalid ltdb header length %d\n",
1095                           (int)data.dsize));
1096                 TALLOC_FREE(buf);
1097                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1098         }
1099         data.dsize -= sizeof(struct ctdb_ltdb_header);
1100         data.dptr += sizeof(struct ctdb_ltdb_header);
1101
1102         if (state->fn) {
1103                 state->fn(key, data, state->private_data);
1104         }
1105
1106         TALLOC_FREE(buf);
1107         return NT_STATUS_OK;
1108 }
1109
1110 /*
1111   Traverse a ctdb database. This uses a kind-of hackish way to open a second
1112   connection to ctdbd to avoid the hairy recursive and async problems with
1113   everything in-line.
1114 */
1115
1116 NTSTATUS ctdbd_traverse(uint32 db_id,
1117                         void (*fn)(TDB_DATA key, TDB_DATA data,
1118                                    void *private_data),
1119                         void *private_data)
1120 {
1121         struct ctdbd_connection *conn;
1122         NTSTATUS status;
1123
1124         TDB_DATA data;
1125         struct ctdb_traverse_start t;
1126         int cstatus;
1127         struct ctdbd_traverse_state state;
1128
1129         status = ctdbd_init_connection(NULL, &conn);
1130         if (!NT_STATUS_IS_OK(status)) {
1131                 DEBUG(0, ("ctdbd_init_connection failed: %s\n",
1132                           nt_errstr(status)));
1133                 return status;
1134         }
1135
1136         t.db_id = db_id;
1137         t.srvid = conn->rand_srvid;
1138         t.reqid = ++conn->reqid;
1139
1140         data.dptr = (uint8_t *)&t;
1141         data.dsize = sizeof(t);
1142
1143         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1144                                CTDB_CONTROL_TRAVERSE_START, conn->rand_srvid, 0,
1145                                data, NULL, NULL, &cstatus);
1146
1147         if (!NT_STATUS_IS_OK(status) || (cstatus != 0)) {
1148
1149                 DEBUG(0,("ctdbd_control failed: %s, %d\n", nt_errstr(status),
1150                          cstatus));
1151
1152                 if (NT_STATUS_IS_OK(status)) {
1153                         /*
1154                          * We need a mapping here
1155                          */
1156                         status = NT_STATUS_UNSUCCESSFUL;
1157                 }
1158                 goto done;
1159         }
1160
1161         state.fn = fn;
1162         state.private_data = private_data;
1163
1164         while (True) {
1165
1166                 status = NT_STATUS_OK;
1167
1168                 if (packet_handler(conn->pkt, ctdb_req_complete,
1169                                    ctdb_traverse_handler, &state, &status)) {
1170
1171                         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1172                                 status = NT_STATUS_OK;
1173                                 break;
1174                         }
1175
1176                         /*
1177                          * There might be more in the queue
1178                          */
1179                         continue;
1180                 }
1181
1182                 if (!NT_STATUS_IS_OK(status)) {
1183                         break;
1184                 }
1185
1186                 status = ctdb_packet_fd_read_sync(conn->pkt);
1187
1188                 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1189                         /*
1190                          * There might be more in the queue
1191                          */
1192                         continue;
1193                 }
1194
1195                 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1196                         status = NT_STATUS_OK;
1197                         break;
1198                 }
1199
1200                 if (!NT_STATUS_IS_OK(status)) {
1201                         DEBUG(0, ("packet_fd_read_sync failed: %s\n", nt_errstr(status)));
1202                         cluster_fatal("ctdbd died\n");
1203                 }
1204         }
1205
1206  done:
1207         TALLOC_FREE(conn);
1208         return status;
1209 }
1210
1211 /*
1212    This is used to canonicalize a ctdb_sock_addr structure.
1213 */
1214 static void smbd_ctdb_canonicalize_ip(const struct sockaddr_storage *in,
1215                                       struct sockaddr_storage *out)
1216 {
1217         memcpy(out, in, sizeof (*out));
1218
1219 #ifdef HAVE_IPV6
1220         if (in->ss_family == AF_INET6) {
1221                 const char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
1222                 const struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)in;
1223                 struct sockaddr_in *out4 = (struct sockaddr_in *)out;
1224                 if (memcmp(&in6->sin6_addr, prefix, 12) == 0) {
1225                         memset(out, 0, sizeof(*out));
1226 #ifdef HAVE_SOCK_SIN_LEN
1227                         out4->sin_len = sizeof(*out);
1228 #endif
1229                         out4->sin_family = AF_INET;
1230                         out4->sin_port   = in6->sin6_port;
1231                         memcpy(&out4->sin_addr, &in6->sin6_addr.s6_addr32[3], 4);
1232                 }
1233         }
1234 #endif
1235 }
1236
1237 /*
1238  * Register us as a server for a particular tcp connection
1239  */
1240
1241 NTSTATUS ctdbd_register_ips(struct ctdbd_connection *conn,
1242                             const struct sockaddr_storage *_server,
1243                             const struct sockaddr_storage *_client,
1244                             void (*release_ip_handler)(const char *ip_addr,
1245                                                        void *private_data),
1246                             void *private_data)
1247 {
1248         /*
1249          * we still use ctdb_control_tcp for ipv4
1250          * because we want to work against older ctdb
1251          * versions at runtime
1252          */
1253         struct ctdb_control_tcp p4;
1254 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1255         struct ctdb_control_tcp_addr p;
1256 #endif
1257         TDB_DATA data;
1258         NTSTATUS status;
1259         struct sockaddr_storage client;
1260         struct sockaddr_storage server;
1261
1262         /*
1263          * Only one connection so far
1264          */
1265         SMB_ASSERT(conn->release_ip_handler == NULL);
1266
1267         smbd_ctdb_canonicalize_ip(_client, &client);
1268         smbd_ctdb_canonicalize_ip(_server, &server);
1269
1270         switch (client.ss_family) {
1271         case AF_INET:
1272                 p4.dest = *(struct sockaddr_in *)&server;
1273                 p4.src = *(struct sockaddr_in *)&client;
1274                 data.dptr = (uint8_t *)&p4;
1275                 data.dsize = sizeof(p4);
1276                 break;
1277 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1278         case AF_INET6:
1279                 p.dest.ip6 = *(struct sockaddr_in6 *)&server;
1280                 p.src.ip6 = *(struct sockaddr_in6 *)&client;
1281                 data.dptr = (uint8_t *)&p;
1282                 data.dsize = sizeof(p);
1283                 break;
1284 #endif
1285         default:
1286                 return NT_STATUS_INTERNAL_ERROR;
1287         }
1288
1289         conn->release_ip_handler = release_ip_handler;
1290
1291         /*
1292          * We want to be told about IP releases
1293          */
1294
1295         status = register_with_ctdbd(conn, CTDB_SRVID_RELEASE_IP);
1296         if (!NT_STATUS_IS_OK(status)) {
1297                 return status;
1298         }
1299
1300         /*
1301          * inform ctdb of our tcp connection, so if IP takeover happens ctdb
1302          * can send an extra ack to trigger a reset for our client, so it
1303          * immediately reconnects
1304          */
1305         return ctdbd_control(conn, CTDB_CURRENT_NODE,
1306                              CTDB_CONTROL_TCP_CLIENT, 0,
1307                              CTDB_CTRL_FLAG_NOREPLY, data, NULL, NULL, NULL);
1308 }
1309
1310 /*
1311  * We want to handle reconfigure events
1312  */
1313 NTSTATUS ctdbd_register_reconfigure(struct ctdbd_connection *conn)
1314 {
1315         return register_with_ctdbd(conn, CTDB_SRVID_RECONFIGURE);
1316 }
1317
1318 /*
1319   call a control on the local node
1320  */
1321 NTSTATUS ctdbd_control_local(struct ctdbd_connection *conn, uint32 opcode,
1322                              uint64_t srvid, uint32_t flags, TDB_DATA data,
1323                              TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
1324                              int *cstatus)
1325 {
1326         return ctdbd_control(conn, CTDB_CURRENT_NODE, opcode, srvid, flags, data, mem_ctx, outdata, cstatus);
1327 }
1328
1329 NTSTATUS ctdb_watch_us(struct ctdbd_connection *conn)
1330 {
1331         struct ctdb_client_notify_register reg_data;
1332         size_t struct_len;
1333         NTSTATUS status;
1334         int cstatus;
1335
1336         reg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1337         reg_data.len = 1;
1338         reg_data.notify_data[0] = 0;
1339
1340         struct_len = offsetof(struct ctdb_client_notify_register,
1341                               notify_data) + reg_data.len;
1342
1343         status = ctdbd_control_local(
1344                 conn, CTDB_CONTROL_REGISTER_NOTIFY, conn->rand_srvid, 0,
1345                 make_tdb_data((uint8_t *)&reg_data, struct_len),
1346                 NULL, NULL, &cstatus);
1347         if (!NT_STATUS_IS_OK(status)) {
1348                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1349                           nt_errstr(status)));
1350         }
1351         return status;
1352 }
1353
1354 NTSTATUS ctdb_unwatch(struct ctdbd_connection *conn)
1355 {
1356         struct ctdb_client_notify_deregister dereg_data;
1357         NTSTATUS status;
1358         int cstatus;
1359
1360         dereg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1361
1362         status = ctdbd_control_local(
1363                 conn, CTDB_CONTROL_DEREGISTER_NOTIFY, conn->rand_srvid, 0,
1364                 make_tdb_data((uint8_t *)&dereg_data, sizeof(dereg_data)),
1365                 NULL, NULL, &cstatus);
1366         if (!NT_STATUS_IS_OK(status)) {
1367                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1368                           nt_errstr(status)));
1369         }
1370         return status;
1371 }
1372
1373 #else
1374
1375 NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
1376                                struct ctdbd_connection **pconn)
1377 {
1378         return NT_STATUS_NOT_IMPLEMENTED;
1379 }
1380
1381 #endif