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 int ctdbd_conn_get_fd(struct ctdbd_connection *conn)
 523 {
 524         return packet_get_fd(conn->pkt);
 525 }
 526
 527 /*
 528  * Packet handler to receive and handle a ctdb message
 529  */
 530 static NTSTATUS ctdb_handle_message(uint8_t *buf, size_t length,
 531                                     void *private_data)
 532 {
 533         struct ctdbd_connection *conn = talloc_get_type_abort(
 534                 private_data, struct ctdbd_connection);
 535         struct ctdb_req_message *msg;
 536         struct messaging_rec *msg_rec;
 537
 538         msg = (struct ctdb_req_message *)buf;
 539
 540         if (msg->hdr.operation != CTDB_REQ_MESSAGE) {
 541                 DEBUG(0, ("Received async msg of type %u, discarding\n",
 542                           msg->hdr.operation));
 543                 TALLOC_FREE(buf);
 544                 return NT_STATUS_INVALID_PARAMETER;
 545         }
 546
 547         if ((conn->release_ip_handler != NULL)
 548             && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 549                 /* must be dispatched immediately */
 550                 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 551                 conn->release_ip_handler((const char *)msg->data,
 552                                          conn->release_ip_priv);
 553                 TALLOC_FREE(buf);
 554                 return NT_STATUS_OK;
 555         }
 556
 557         SMB_ASSERT(conn->msg_ctx != NULL);
 558
 559         if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 560             || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)){
 561                 DEBUG(0,("Got cluster reconfigure message\n"));
 562                 /*
 563                  * when the cluster is reconfigured or someone of the
 564                  * family has passed away (SAMBA_NOTIFY), we need to
 565                  * clean the brl database
 566                  */
 567                 messaging_send(conn->msg_ctx, procid_self(),
 568                                MSG_SMB_BRL_VALIDATE, &data_blob_null);
 569
 570                 messaging_send(conn->msg_ctx, procid_self(),
 571                                MSG_DBWRAP_G_LOCK_RETRY,
 572                                &data_blob_null);
 573
 574                 TALLOC_FREE(buf);
 575                 return NT_STATUS_OK;
 576         }
 577
 578         /* only messages to our pid or the broadcast are valid here */
 579         if (msg->srvid != sys_getpid() && msg->srvid != MSG_SRVID_SAMBA) {
 580                 DEBUG(0,("Got unexpected message with srvid=%llu\n",
 581                          (unsigned long long)msg->srvid));
 582                 TALLOC_FREE(buf);
 583                 return NT_STATUS_OK;
 584         }
 585
 586         if (!(msg_rec = ctdb_pull_messaging_rec(NULL, length, msg))) {
 587                 DEBUG(10, ("ctdb_pull_messaging_rec failed\n"));
 588                 TALLOC_FREE(buf);
 589                 return NT_STATUS_NO_MEMORY;
 590         }
 591
 592         messaging_dispatch_rec(conn->msg_ctx, msg_rec);
 593
 594         TALLOC_FREE(msg_rec);
 595         TALLOC_FREE(buf);
 596         return NT_STATUS_OK;
 597 }
 598
 599 /*
 600  * The ctdbd socket is readable asynchronuously
 601  */
 602
 603 static void ctdbd_socket_handler(struct event_context *event_ctx,
 604                                  struct fd_event *event,
 605                                  uint16 flags,
 606                                  void *private_data)
 607 {
 608         struct ctdbd_connection *conn = talloc_get_type_abort(
 609                 private_data, struct ctdbd_connection);
 610
 611         NTSTATUS status;
 612
 613         status = packet_fd_read(conn->pkt);
 614
 615         if (!NT_STATUS_IS_OK(status)) {
 616                 DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
 617                 cluster_fatal("ctdbd died\n");
 618         }
 619
 620         while (packet_handler(conn->pkt, ctdb_req_complete,
 621                               ctdb_handle_message, conn, &status)) {
 622                 if (!NT_STATUS_IS_OK(status)) {
 623                         DEBUG(10, ("could not handle incoming message: %s\n",
 624                                    nt_errstr(status)));
 625                 }
 626         }
 627 }
 628
 629 /*
 630  * Prepare a ctdbd connection to receive messages
 631  */
 632
 633 NTSTATUS ctdbd_register_msg_ctx(struct ctdbd_connection *conn,
 634                                 struct messaging_context *msg_ctx)
 635 {
 636         SMB_ASSERT(conn->msg_ctx == NULL);
 637         SMB_ASSERT(conn->fde == NULL);
 638
 639         if (!(conn->fde = event_add_fd(msg_ctx->event_ctx, conn,
 640                                        packet_get_fd(conn->pkt),
 641                                        EVENT_FD_READ,
 642                                        ctdbd_socket_handler,
 643                                        conn))) {
 644                 DEBUG(0, ("event_add_fd failed\n"));
 645                 return NT_STATUS_NO_MEMORY;
 646         }
 647
 648         conn->msg_ctx = msg_ctx;
 649
 650         return NT_STATUS_OK;
 651 }
 652
 653 /*
 654  * Send a messaging message across a ctdbd
 655  */
 656
 657 NTSTATUS ctdbd_messaging_send(struct ctdbd_connection *conn,
 658                               uint32 dst_vnn, uint64 dst_srvid,
 659                               struct messaging_rec *msg)
 660 {
 661         struct ctdb_req_message r;
 662         TALLOC_CTX *mem_ctx;
 663         DATA_BLOB blob;
 664         NTSTATUS status;
 665         enum ndr_err_code ndr_err;
 666
 667         if (!(mem_ctx = talloc_init("ctdbd_messaging_send"))) {
 668                 DEBUG(0, ("talloc failed\n"));
 669                 return NT_STATUS_NO_MEMORY;
 670         }
 671
 672         ndr_err = ndr_push_struct_blob(
 673                 &blob, mem_ctx, NULL, msg,
 674                 (ndr_push_flags_fn_t)ndr_push_messaging_rec);
 675
 676         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 677                 DEBUG(0, ("ndr_push_struct_blob failed: %s\n",
 678                           ndr_errstr(ndr_err)));
 679                 status = ndr_map_error2ntstatus(ndr_err);
 680                 goto fail;
 681         }
 682
 683         r.hdr.length = offsetof(struct ctdb_req_message, data) + blob.length;
 684         r.hdr.ctdb_magic = CTDB_MAGIC;
 685         r.hdr.ctdb_version = CTDB_VERSION;
 686         r.hdr.generation = 1;
 687         r.hdr.operation  = CTDB_REQ_MESSAGE;
 688         r.hdr.destnode   = dst_vnn;
 689         r.hdr.srcnode    = conn->our_vnn;
 690         r.hdr.reqid      = 0;
 691         r.srvid          = dst_srvid;
 692         r.datalen        = blob.length;
 693
 694         DEBUG(10, ("ctdbd_messaging_send: Sending ctdb packet\n"));
 695         ctdb_packet_dump(&r.hdr);
 696
 697         status = packet_send(
 698                 conn->pkt, 2,
 699                 data_blob_const(&r, offsetof(struct ctdb_req_message, data)),
 700                 blob);
 701
 702         if (!NT_STATUS_IS_OK(status)) {
 703                 DEBUG(0, ("packet_send failed: %s\n", nt_errstr(status)));
 704                 goto fail;
 705         }
 706
 707         status = packet_flush(conn->pkt);
 708
 709         if (!NT_STATUS_IS_OK(status)) {
 710                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 711                 cluster_fatal("cluster dispatch daemon msg write error\n");
 712         }
 713
 714         status = NT_STATUS_OK;
 715  fail:
 716         TALLOC_FREE(mem_ctx);
 717         return status;
 718 }
 719
 720 /*
 721  * send/recv a generic ctdb control message
 722  */
 723 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
 724                               uint32_t vnn, uint32 opcode,
 725                               uint64_t srvid, uint32_t flags,
 726                               TDB_DATA data,
 727                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
 728                               int *cstatus)
 729 {
 730         struct ctdb_req_control req;
 731         struct ctdb_reply_control *reply = NULL;
 732         struct ctdbd_connection *new_conn = NULL;
 733         NTSTATUS status;
 734
 735         /* the samba3 ctdb code can't handle NOREPLY yet */
 736         flags &= ~CTDB_CTRL_FLAG_NOREPLY;
 737
 738         if (conn == NULL) {
 739                 status = ctdbd_init_connection(NULL, &new_conn);
 740
 741                 if (!NT_STATUS_IS_OK(status)) {
 742                         DEBUG(10, ("Could not init temp connection: %s\n",
 743                                    nt_errstr(status)));
 744                         goto fail;
 745                 }
 746
 747                 conn = new_conn;
 748         }
 749
 750         ZERO_STRUCT(req);
 751         req.hdr.length = offsetof(struct ctdb_req_control, data) + data.dsize;
 752         req.hdr.ctdb_magic   = CTDB_MAGIC;
 753         req.hdr.ctdb_version = CTDB_VERSION;
 754         req.hdr.operation    = CTDB_REQ_CONTROL;
 755         req.hdr.reqid        = ++conn->reqid;
 756         req.hdr.destnode     = vnn;
 757         req.opcode           = opcode;
 758         req.srvid            = srvid;
 759         req.datalen          = data.dsize;
 760
 761         DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
 762         ctdb_packet_dump(&req.hdr);
 763
 764         status = packet_send(
 765                 conn->pkt, 2,
 766                 data_blob_const(&req, offsetof(struct ctdb_req_control, data)),
 767                 data_blob_const(data.dptr, data.dsize));
 768
 769         if (!NT_STATUS_IS_OK(status)) {
 770                 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
 771                 goto fail;
 772         }
 773
 774         status = packet_flush(conn->pkt);
 775
 776         if (!NT_STATUS_IS_OK(status)) {
 777                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 778                 cluster_fatal("cluster dispatch daemon control write error\n");
 779         }
 780
 781         if (flags & CTDB_CTRL_FLAG_NOREPLY) {
 782                 TALLOC_FREE(new_conn);
 783                 return NT_STATUS_OK;
 784         }
 785
 786         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
 787
 788         if (!NT_STATUS_IS_OK(status)) {
 789                 DEBUG(10, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 790                 goto fail;
 791         }
 792
 793         if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
 794                 DEBUG(0, ("received invalid reply\n"));
 795                 goto fail;
 796         }
 797
 798         if (outdata) {
 799                 if (!(outdata->dptr = (uint8 *)talloc_memdup(
 800                               mem_ctx, reply->data, reply->datalen))) {
 801                         TALLOC_FREE(reply);
 802                         return NT_STATUS_NO_MEMORY;
 803                 }
 804                 outdata->dsize = reply->datalen;
 805         }
 806         if (cstatus) {
 807                 (*cstatus) = reply->status;
 808         }
 809
 810         status = NT_STATUS_OK;
 811
 812  fail:
 813         TALLOC_FREE(new_conn);
 814         TALLOC_FREE(reply);
 815         return status;
 816 }
 817
 818 /*
 819  * see if a remote process exists
 820  */
 821 bool ctdbd_process_exists(struct ctdbd_connection *conn, uint32 vnn, pid_t pid)
 822 {
 823         NTSTATUS status;
 824         TDB_DATA data;
 825         int32_t cstatus;
 826
 827         data.dptr = (uint8_t*)&pid;
 828         data.dsize = sizeof(pid);
 829
 830         status = ctdbd_control(conn, vnn, CTDB_CONTROL_PROCESS_EXISTS, 0, 0,
 831                                data, NULL, NULL, &cstatus);
 832         if (!NT_STATUS_IS_OK(status)) {
 833                 DEBUG(0, (__location__ " ctdb_control for process_exists "
 834                           "failed\n"));
 835                 return False;
 836         }
 837
 838         return cstatus == 0;
 839 }
 840
 841 /*
 842  * Get a db path
 843  */
 844 char *ctdbd_dbpath(struct ctdbd_connection *conn,
 845                    TALLOC_CTX *mem_ctx, uint32_t db_id)
 846 {
 847         NTSTATUS status;
 848         TDB_DATA data;
 849         int32_t cstatus;
 850
 851         data.dptr = (uint8_t*)&db_id;
 852         data.dsize = sizeof(db_id);
 853
 854         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 855                                CTDB_CONTROL_GETDBPATH, 0, 0, data,
 856                                mem_ctx, &data, &cstatus);
 857         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
 858                 DEBUG(0,(__location__ " ctdb_control for getdbpath failed\n"));
 859                 return NULL;
 860         }
 861
 862         return (char *)data.dptr;
 863 }
 864
 865 /*
 866  * attach to a ctdb database
 867  */
 868 NTSTATUS ctdbd_db_attach(struct ctdbd_connection *conn,
 869                          const char *name, uint32_t *db_id, int tdb_flags)
 870 {
 871         NTSTATUS status;
 872         TDB_DATA data;
 873         int32_t cstatus;
 874         bool persistent = (tdb_flags & TDB_CLEAR_IF_FIRST) == 0;
 875
 876         data.dptr = (uint8_t*)name;
 877         data.dsize = strlen(name)+1;
 878
 879         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 880                                persistent
 881                                ? CTDB_CONTROL_DB_ATTACH_PERSISTENT
 882                                : CTDB_CONTROL_DB_ATTACH,
 883                                0, 0, data, NULL, &data, &cstatus);
 884         if (!NT_STATUS_IS_OK(status)) {
 885                 DEBUG(0, (__location__ " ctdb_control for db_attach "
 886                           "failed: %s\n", nt_errstr(status)));
 887                 return status;
 888         }
 889
 890         if (cstatus != 0 || data.dsize != sizeof(uint32_t)) {
 891                 DEBUG(0,(__location__ " ctdb_control for db_attach failed\n"));
 892                 return NT_STATUS_INTERNAL_ERROR;
 893         }
 894
 895         *db_id = *(uint32_t *)data.dptr;
 896         talloc_free(data.dptr);
 897
 898         if (!(tdb_flags & TDB_SEQNUM)) {
 899                 return NT_STATUS_OK;
 900         }
 901
 902         data.dptr = (uint8_t *)db_id;
 903         data.dsize = sizeof(*db_id);
 904
 905         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 906                                CTDB_CONTROL_ENABLE_SEQNUM, 0, 0, data,
 907                                NULL, NULL, &cstatus);
 908         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
 909                 DEBUG(0,(__location__ " ctdb_control for enable seqnum "
 910                          "failed\n"));
 911                 return NT_STATUS_IS_OK(status) ? NT_STATUS_INTERNAL_ERROR :
 912                         status;
 913         }
 914
 915         return NT_STATUS_OK;
 916 }
 917
 918 /*
 919  * force the migration of a record to this node
 920  */
 921 NTSTATUS ctdbd_migrate(struct ctdbd_connection *conn, uint32 db_id,
 922                        TDB_DATA key)
 923 {
 924         struct ctdb_req_call req;
 925         struct ctdb_reply_call *reply;
 926         NTSTATUS status;
 927
 928         ZERO_STRUCT(req);
 929
 930         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
 931         req.hdr.ctdb_magic   = CTDB_MAGIC;
 932         req.hdr.ctdb_version = CTDB_VERSION;
 933         req.hdr.operation    = CTDB_REQ_CALL;
 934         req.hdr.reqid        = ++conn->reqid;
 935         req.flags            = CTDB_IMMEDIATE_MIGRATION;
 936         req.callid           = CTDB_NULL_FUNC;
 937         req.db_id            = db_id;
 938         req.keylen           = key.dsize;
 939
 940         DEBUG(10, ("ctdbd_migrate: Sending ctdb packet\n"));
 941         ctdb_packet_dump(&req.hdr);
 942
 943         status = packet_send(
 944                 conn->pkt, 2,
 945                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
 946                 data_blob_const(key.dptr, key.dsize));
 947
 948         if (!NT_STATUS_IS_OK(status)) {
 949                 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
 950                 return status;
 951         }
 952
 953         status = packet_flush(conn->pkt);
 954
 955         if (!NT_STATUS_IS_OK(status)) {
 956                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 957                 cluster_fatal("cluster dispatch daemon control write error\n");
 958         }
 959
 960         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
 961
 962         if (!NT_STATUS_IS_OK(status)) {
 963                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 964                 goto fail;
 965         }
 966
 967         if (reply->hdr.operation != CTDB_REPLY_CALL) {
 968                 DEBUG(0, ("received invalid reply\n"));
 969                 status = NT_STATUS_INTERNAL_ERROR;
 970                 goto fail;
 971         }
 972
 973         status = NT_STATUS_OK;
 974  fail:
 975
 976         TALLOC_FREE(reply);
 977         return status;
 978 }
 979
 980 /*
 981  * remotely fetch a record without locking it or forcing a migration
 982  */
 983 NTSTATUS ctdbd_fetch(struct ctdbd_connection *conn, uint32 db_id,
 984                      TDB_DATA key, TALLOC_CTX *mem_ctx, TDB_DATA *data)
 985 {
 986         struct ctdb_req_call req;
 987         struct ctdb_reply_call *reply;
 988         NTSTATUS status;
 989
 990         ZERO_STRUCT(req);
 991
 992         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
 993         req.hdr.ctdb_magic   = CTDB_MAGIC;
 994         req.hdr.ctdb_version = CTDB_VERSION;
 995         req.hdr.operation    = CTDB_REQ_CALL;
 996         req.hdr.reqid        = ++conn->reqid;
 997         req.flags            = 0;
 998         req.callid           = CTDB_FETCH_FUNC;
 999         req.db_id            = db_id;
1000         req.keylen           = key.dsize;
1001
1002         status = packet_send(
1003                 conn->pkt, 2,
1004                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
1005                 data_blob_const(key.dptr, key.dsize));
1006
1007         if (!NT_STATUS_IS_OK(status)) {
1008                 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
1009                 return status;
1010         }
1011
1012         status = packet_flush(conn->pkt);
1013
1014         if (!NT_STATUS_IS_OK(status)) {
1015                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
1016                 cluster_fatal("cluster dispatch daemon control write error\n");
1017         }
1018
1019         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
1020
1021         if (!NT_STATUS_IS_OK(status)) {
1022                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1023                 goto fail;
1024         }
1025
1026         if (reply->hdr.operation != CTDB_REPLY_CALL) {
1027                 DEBUG(0, ("received invalid reply\n"));
1028                 status = NT_STATUS_INTERNAL_ERROR;
1029                 goto fail;
1030         }
1031
1032         data->dsize = reply->datalen;
1033         if (data->dsize == 0) {
1034                 data->dptr = NULL;
1035                 goto done;
1036         }
1037
1038         data->dptr = (uint8 *)talloc_memdup(mem_ctx, &reply->data[0],
1039                                             reply->datalen);
1040         if (data->dptr == NULL) {
1041                 DEBUG(0, ("talloc failed\n"));
1042                 status = NT_STATUS_NO_MEMORY;
1043                 goto fail;
1044         }
1045
1046  done:
1047         status = NT_STATUS_OK;
1048  fail:
1049         TALLOC_FREE(reply);
1050         return status;
1051 }
1052
1053 struct ctdbd_traverse_state {
1054         void (*fn)(TDB_DATA key, TDB_DATA data, void *private_data);
1055         void *private_data;
1056 };
1057
1058 /*
1059  * Handle a traverse record coming in on the ctdbd connection
1060  */
1061
1062 static NTSTATUS ctdb_traverse_handler(uint8_t *buf, size_t length,
1063                                       void *private_data)
1064 {
1065         struct ctdbd_traverse_state *state =
1066                 (struct ctdbd_traverse_state *)private_data;
1067
1068         struct ctdb_req_message *m;
1069         struct ctdb_rec_data *d;
1070         TDB_DATA key, data;
1071
1072         m = (struct ctdb_req_message *)buf;
1073
1074         if (length < sizeof(*m) || m->hdr.length != length) {
1075                 DEBUG(0, ("Got invalid message of length %d\n", (int)length));
1076                 TALLOC_FREE(buf);
1077                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1078         }
1079
1080         d = (struct ctdb_rec_data *)&m->data[0];
1081         if (m->datalen < sizeof(uint32_t) || m->datalen != d->length) {
1082                 DEBUG(0, ("Got invalid traverse data of length %d\n",
1083                           (int)m->datalen));
1084                 TALLOC_FREE(buf);
1085                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1086         }
1087
1088         key.dsize = d->keylen;
1089         key.dptr  = &d->data[0];
1090         data.dsize = d->datalen;
1091         data.dptr = &d->data[d->keylen];
1092
1093         if (key.dsize == 0 && data.dsize == 0) {
1094                 /* end of traverse */
1095                 return NT_STATUS_END_OF_FILE;
1096         }
1097
1098         if (data.dsize < sizeof(struct ctdb_ltdb_header)) {
1099                 DEBUG(0, ("Got invalid ltdb header length %d\n",
1100                           (int)data.dsize));
1101                 TALLOC_FREE(buf);
1102                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1103         }
1104         data.dsize -= sizeof(struct ctdb_ltdb_header);
1105         data.dptr += sizeof(struct ctdb_ltdb_header);
1106
1107         if (state->fn) {
1108                 state->fn(key, data, state->private_data);
1109         }
1110
1111         TALLOC_FREE(buf);
1112         return NT_STATUS_OK;
1113 }
1114
1115 /*
1116   Traverse a ctdb database. This uses a kind-of hackish way to open a second
1117   connection to ctdbd to avoid the hairy recursive and async problems with
1118   everything in-line.
1119 */
1120
1121 NTSTATUS ctdbd_traverse(uint32 db_id,
1122                         void (*fn)(TDB_DATA key, TDB_DATA data,
1123                                    void *private_data),
1124                         void *private_data)
1125 {
1126         struct ctdbd_connection *conn;
1127         NTSTATUS status;
1128
1129         TDB_DATA data;
1130         struct ctdb_traverse_start t;
1131         int cstatus;
1132         struct ctdbd_traverse_state state;
1133
1134         status = ctdbd_init_connection(NULL, &conn);
1135         if (!NT_STATUS_IS_OK(status)) {
1136                 DEBUG(0, ("ctdbd_init_connection failed: %s\n",
1137                           nt_errstr(status)));
1138                 return status;
1139         }
1140
1141         t.db_id = db_id;
1142         t.srvid = conn->rand_srvid;
1143         t.reqid = ++conn->reqid;
1144
1145         data.dptr = (uint8_t *)&t;
1146         data.dsize = sizeof(t);
1147
1148         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1149                                CTDB_CONTROL_TRAVERSE_START, conn->rand_srvid, 0,
1150                                data, NULL, NULL, &cstatus);
1151
1152         if (!NT_STATUS_IS_OK(status) || (cstatus != 0)) {
1153
1154                 DEBUG(0,("ctdbd_control failed: %s, %d\n", nt_errstr(status),
1155                          cstatus));
1156
1157                 if (NT_STATUS_IS_OK(status)) {
1158                         /*
1159                          * We need a mapping here
1160                          */
1161                         status = NT_STATUS_UNSUCCESSFUL;
1162                 }
1163                 goto done;
1164         }
1165
1166         state.fn = fn;
1167         state.private_data = private_data;
1168
1169         while (True) {
1170
1171                 status = NT_STATUS_OK;
1172
1173                 if (packet_handler(conn->pkt, ctdb_req_complete,
1174                                    ctdb_traverse_handler, &state, &status)) {
1175
1176                         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1177                                 status = NT_STATUS_OK;
1178                                 break;
1179                         }
1180
1181                         /*
1182                          * There might be more in the queue
1183                          */
1184                         continue;
1185                 }
1186
1187                 if (!NT_STATUS_IS_OK(status)) {
1188                         break;
1189                 }
1190
1191                 status = ctdb_packet_fd_read_sync(conn->pkt);
1192
1193                 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1194                         /*
1195                          * There might be more in the queue
1196                          */
1197                         continue;
1198                 }
1199
1200                 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1201                         status = NT_STATUS_OK;
1202                         break;
1203                 }
1204
1205                 if (!NT_STATUS_IS_OK(status)) {
1206                         DEBUG(0, ("packet_fd_read_sync failed: %s\n", nt_errstr(status)));
1207                         cluster_fatal("ctdbd died\n");
1208                 }
1209         }
1210
1211  done:
1212         TALLOC_FREE(conn);
1213         return status;
1214 }
1215
1216 /*
1217    This is used to canonicalize a ctdb_sock_addr structure.
1218 */
1219 static void smbd_ctdb_canonicalize_ip(const struct sockaddr_storage *in,
1220                                       struct sockaddr_storage *out)
1221 {
1222         memcpy(out, in, sizeof (*out));
1223
1224 #ifdef HAVE_IPV6
1225         if (in->ss_family == AF_INET6) {
1226                 const char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
1227                 const struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)in;
1228                 struct sockaddr_in *out4 = (struct sockaddr_in *)out;
1229                 if (memcmp(&in6->sin6_addr, prefix, 12) == 0) {
1230                         memset(out, 0, sizeof(*out));
1231 #ifdef HAVE_SOCK_SIN_LEN
1232                         out4->sin_len = sizeof(*out);
1233 #endif
1234                         out4->sin_family = AF_INET;
1235                         out4->sin_port   = in6->sin6_port;
1236                         memcpy(&out4->sin_addr, &in6->sin6_addr.s6_addr32[3], 4);
1237                 }
1238         }
1239 #endif
1240 }
1241
1242 /*
1243  * Register us as a server for a particular tcp connection
1244  */
1245
1246 NTSTATUS ctdbd_register_ips(struct ctdbd_connection *conn,
1247                             const struct sockaddr_storage *_server,
1248                             const struct sockaddr_storage *_client,
1249                             void (*release_ip_handler)(const char *ip_addr,
1250                                                        void *private_data),
1251                             void *private_data)
1252 {
1253         /*
1254          * we still use ctdb_control_tcp for ipv4
1255          * because we want to work against older ctdb
1256          * versions at runtime
1257          */
1258         struct ctdb_control_tcp p4;
1259 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1260         struct ctdb_control_tcp_addr p;
1261 #endif
1262         TDB_DATA data;
1263         NTSTATUS status;
1264         struct sockaddr_storage client;
1265         struct sockaddr_storage server;
1266
1267         /*
1268          * Only one connection so far
1269          */
1270         SMB_ASSERT(conn->release_ip_handler == NULL);
1271
1272         smbd_ctdb_canonicalize_ip(_client, &client);
1273         smbd_ctdb_canonicalize_ip(_server, &server);
1274
1275         switch (client.ss_family) {
1276         case AF_INET:
1277                 p4.dest = *(struct sockaddr_in *)&server;
1278                 p4.src = *(struct sockaddr_in *)&client;
1279                 data.dptr = (uint8_t *)&p4;
1280                 data.dsize = sizeof(p4);
1281                 break;
1282 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1283         case AF_INET6:
1284                 p.dest.ip6 = *(struct sockaddr_in6 *)&server;
1285                 p.src.ip6 = *(struct sockaddr_in6 *)&client;
1286                 data.dptr = (uint8_t *)&p;
1287                 data.dsize = sizeof(p);
1288                 break;
1289 #endif
1290         default:
1291                 return NT_STATUS_INTERNAL_ERROR;
1292         }
1293
1294         conn->release_ip_handler = release_ip_handler;
1295
1296         /*
1297          * We want to be told about IP releases
1298          */
1299
1300         status = register_with_ctdbd(conn, CTDB_SRVID_RELEASE_IP);
1301         if (!NT_STATUS_IS_OK(status)) {
1302                 return status;
1303         }
1304
1305         /*
1306          * inform ctdb of our tcp connection, so if IP takeover happens ctdb
1307          * can send an extra ack to trigger a reset for our client, so it
1308          * immediately reconnects
1309          */
1310         return ctdbd_control(conn, CTDB_CURRENT_NODE,
1311                              CTDB_CONTROL_TCP_CLIENT, 0,
1312                              CTDB_CTRL_FLAG_NOREPLY, data, NULL, NULL, NULL);
1313 }
1314
1315 /*
1316  * We want to handle reconfigure events
1317  */
1318 NTSTATUS ctdbd_register_reconfigure(struct ctdbd_connection *conn)
1319 {
1320         return register_with_ctdbd(conn, CTDB_SRVID_RECONFIGURE);
1321 }
1322
1323 /*
1324   call a control on the local node
1325  */
1326 NTSTATUS ctdbd_control_local(struct ctdbd_connection *conn, uint32 opcode,
1327                              uint64_t srvid, uint32_t flags, TDB_DATA data,
1328                              TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
1329                              int *cstatus)
1330 {
1331         return ctdbd_control(conn, CTDB_CURRENT_NODE, opcode, srvid, flags, data, mem_ctx, outdata, cstatus);
1332 }
1333
1334 NTSTATUS ctdb_watch_us(struct ctdbd_connection *conn)
1335 {
1336         struct ctdb_client_notify_register reg_data;
1337         size_t struct_len;
1338         NTSTATUS status;
1339         int cstatus;
1340
1341         reg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1342         reg_data.len = 1;
1343         reg_data.notify_data[0] = 0;
1344
1345         struct_len = offsetof(struct ctdb_client_notify_register,
1346                               notify_data) + reg_data.len;
1347
1348         status = ctdbd_control_local(
1349                 conn, CTDB_CONTROL_REGISTER_NOTIFY, conn->rand_srvid, 0,
1350                 make_tdb_data((uint8_t *)&reg_data, struct_len),
1351                 NULL, NULL, &cstatus);
1352         if (!NT_STATUS_IS_OK(status)) {
1353                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1354                           nt_errstr(status)));
1355         }
1356         return status;
1357 }
1358
1359 NTSTATUS ctdb_unwatch(struct ctdbd_connection *conn)
1360 {
1361         struct ctdb_client_notify_deregister dereg_data;
1362         NTSTATUS status;
1363         int cstatus;
1364
1365         dereg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1366
1367         status = ctdbd_control_local(
1368                 conn, CTDB_CONTROL_DEREGISTER_NOTIFY, conn->rand_srvid, 0,
1369                 make_tdb_data((uint8_t *)&dereg_data, sizeof(dereg_data)),
1370                 NULL, NULL, &cstatus);
1371         if (!NT_STATUS_IS_OK(status)) {
1372                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1373                           nt_errstr(status)));
1374         }
1375         return status;
1376 }
1377
1378 #else
1379
1380 NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
1381                                struct ctdbd_connection **pconn)
1382 {
1383         return NT_STATUS_NOT_IMPLEMENTED;
1384 }
1385
1386 #endif