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(1);
  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 *)(void *)&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, 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,
 372                                        messaging_server_id(conn->msg_ctx),
 373                                        MSG_SMB_BRL_VALIDATE, &data_blob_null);
 374                         messaging_send(conn->msg_ctx,
 375                                        messaging_server_id(conn->msg_ctx),
 376                                        MSG_DBWRAP_G_LOCK_RETRY,
 377                                        &data_blob_null);
 378                         TALLOC_FREE(hdr);
 379                         goto next_pkt;
 380                 }
 381
 382                 if (!(msg_state = TALLOC_P(talloc_autofree_context(), struct deferred_msg_state))) {
 383                         DEBUG(0, ("talloc failed\n"));
 384                         TALLOC_FREE(hdr);
 385                         goto next_pkt;
 386                 }
 387
 388                 if (!(msg_state->rec = ctdb_pull_messaging_rec(
 389                               msg_state, state.req.length, msg))) {
 390                         DEBUG(0, ("ctdbd_pull_messaging_rec failed\n"));
 391                         TALLOC_FREE(msg_state);
 392                         TALLOC_FREE(hdr);
 393                         goto next_pkt;
 394                 }
 395
 396                 TALLOC_FREE(hdr);
 397
 398                 msg_state->msg_ctx = conn->msg_ctx;
 399
 400                 /*
 401                  * We're waiting for a call reply, but an async message has
 402                  * crossed. Defer dispatching to the toplevel event loop.
 403                  */
 404                 evt = event_add_timed(conn->msg_ctx->event_ctx,
 405                                       conn->msg_ctx->event_ctx,
 406                                       timeval_zero(),
 407                                       deferred_message_dispatch,
 408                                       msg_state);
 409                 if (evt == NULL) {
 410                         DEBUG(0, ("event_add_timed failed\n"));
 411                         TALLOC_FREE(msg_state);
 412                         TALLOC_FREE(hdr);
 413                         goto next_pkt;
 414                 }
 415
 416                 goto next_pkt;
 417         }
 418
 419         if (hdr->reqid != reqid) {
 420                 /* we got the wrong reply */
 421                 DEBUG(0,("Discarding mismatched ctdb reqid %u should have "
 422                          "been %u\n", hdr->reqid, reqid));
 423                 TALLOC_FREE(hdr);
 424                 goto again;
 425         }
 426
 427         *((void **)result) = talloc_move(mem_ctx, &hdr);
 428
 429         return NT_STATUS_OK;
 430 }
 431
 432 /*
 433  * Get us a ctdbd connection
 434  */
 435
 436 static NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
 437                                       struct ctdbd_connection **pconn)
 438 {
 439         struct ctdbd_connection *conn;
 440         NTSTATUS status;
 441
 442         if (!(conn = TALLOC_ZERO_P(mem_ctx, struct ctdbd_connection))) {
 443                 DEBUG(0, ("talloc failed\n"));
 444                 return NT_STATUS_NO_MEMORY;
 445         }
 446
 447         status = ctdbd_connect(conn, &conn->pkt);
 448
 449         if (!NT_STATUS_IS_OK(status)) {
 450                 DEBUG(10, ("ctdbd_connect failed: %s\n", nt_errstr(status)));
 451                 goto fail;
 452         }
 453
 454         status = get_cluster_vnn(conn, &conn->our_vnn);
 455
 456         if (!NT_STATUS_IS_OK(status)) {
 457                 DEBUG(10, ("get_cluster_vnn failed: %s\n", nt_errstr(status)));
 458                 goto fail;
 459         }
 460
 461         generate_random_buffer((unsigned char *)&conn->rand_srvid,
 462                                sizeof(conn->rand_srvid));
 463
 464         status = register_with_ctdbd(conn, conn->rand_srvid);
 465
 466         if (!NT_STATUS_IS_OK(status)) {
 467                 DEBUG(5, ("Could not register random srvid: %s\n",
 468                           nt_errstr(status)));
 469                 goto fail;
 470         }
 471
 472         *pconn = conn;
 473         return NT_STATUS_OK;
 474
 475  fail:
 476         TALLOC_FREE(conn);
 477         return status;
 478 }
 479
 480 /*
 481  * Get us a ctdbd connection and register us as a process
 482  */
 483
 484 NTSTATUS ctdbd_messaging_connection(TALLOC_CTX *mem_ctx,
 485                                     struct ctdbd_connection **pconn)
 486 {
 487         struct ctdbd_connection *conn;
 488         NTSTATUS status;
 489
 490         status = ctdbd_init_connection(mem_ctx, &conn);
 491
 492         if (!NT_STATUS_IS_OK(status)) {
 493                 return status;
 494         }
 495
 496         status = register_with_ctdbd(conn, (uint64_t)sys_getpid());
 497         if (!NT_STATUS_IS_OK(status)) {
 498                 goto fail;
 499         }
 500
 501         status = register_with_ctdbd(conn, MSG_SRVID_SAMBA);
 502         if (!NT_STATUS_IS_OK(status)) {
 503                 goto fail;
 504         }
 505
 506         status = register_with_ctdbd(conn, CTDB_SRVID_SAMBA_NOTIFY);
 507         if (!NT_STATUS_IS_OK(status)) {
 508                 goto fail;
 509         }
 510
 511         *pconn = conn;
 512         return NT_STATUS_OK;
 513
 514  fail:
 515         TALLOC_FREE(conn);
 516         return status;
 517 }
 518
 519 struct messaging_context *ctdb_conn_msg_ctx(struct ctdbd_connection *conn)
 520 {
 521         return conn->msg_ctx;
 522 }
 523
 524 int ctdbd_conn_get_fd(struct ctdbd_connection *conn)
 525 {
 526         return packet_get_fd(conn->pkt);
 527 }
 528
 529 /*
 530  * Packet handler to receive and handle a ctdb message
 531  */
 532 static NTSTATUS ctdb_handle_message(uint8_t *buf, size_t length,
 533                                     void *private_data)
 534 {
 535         struct ctdbd_connection *conn = talloc_get_type_abort(
 536                 private_data, struct ctdbd_connection);
 537         struct ctdb_req_message *msg;
 538         struct messaging_rec *msg_rec;
 539
 540         msg = (struct ctdb_req_message *)buf;
 541
 542         if (msg->hdr.operation != CTDB_REQ_MESSAGE) {
 543                 DEBUG(0, ("Received async msg of type %u, discarding\n",
 544                           msg->hdr.operation));
 545                 TALLOC_FREE(buf);
 546                 return NT_STATUS_INVALID_PARAMETER;
 547         }
 548
 549         if ((conn->release_ip_handler != NULL)
 550             && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 551                 /* must be dispatched immediately */
 552                 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 553                 conn->release_ip_handler((const char *)msg->data,
 554                                          conn->release_ip_priv);
 555                 TALLOC_FREE(buf);
 556                 return NT_STATUS_OK;
 557         }
 558
 559         SMB_ASSERT(conn->msg_ctx != NULL);
 560
 561         if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 562             || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)){
 563                 DEBUG(0,("Got cluster reconfigure message\n"));
 564                 /*
 565                  * when the cluster is reconfigured or someone of the
 566                  * family has passed away (SAMBA_NOTIFY), we need to
 567                  * clean the brl database
 568                  */
 569                 messaging_send(conn->msg_ctx,
 570                                messaging_server_id(conn->msg_ctx),
 571                                MSG_SMB_BRL_VALIDATE, &data_blob_null);
 572
 573                 messaging_send(conn->msg_ctx,
 574                                messaging_server_id(conn->msg_ctx),
 575                                MSG_DBWRAP_G_LOCK_RETRY,
 576                                &data_blob_null);
 577
 578                 TALLOC_FREE(buf);
 579                 return NT_STATUS_OK;
 580         }
 581
 582         /* only messages to our pid or the broadcast are valid here */
 583         if (msg->srvid != sys_getpid() && msg->srvid != MSG_SRVID_SAMBA) {
 584                 DEBUG(0,("Got unexpected message with srvid=%llu\n",
 585                          (unsigned long long)msg->srvid));
 586                 TALLOC_FREE(buf);
 587                 return NT_STATUS_OK;
 588         }
 589
 590         if (!(msg_rec = ctdb_pull_messaging_rec(NULL, length, msg))) {
 591                 DEBUG(10, ("ctdb_pull_messaging_rec failed\n"));
 592                 TALLOC_FREE(buf);
 593                 return NT_STATUS_NO_MEMORY;
 594         }
 595
 596         messaging_dispatch_rec(conn->msg_ctx, msg_rec);
 597
 598         TALLOC_FREE(msg_rec);
 599         TALLOC_FREE(buf);
 600         return NT_STATUS_OK;
 601 }
 602
 603 /*
 604  * The ctdbd socket is readable asynchronuously
 605  */
 606
 607 static void ctdbd_socket_handler(struct event_context *event_ctx,
 608                                  struct fd_event *event,
 609                                  uint16 flags,
 610                                  void *private_data)
 611 {
 612         struct ctdbd_connection *conn = talloc_get_type_abort(
 613                 private_data, struct ctdbd_connection);
 614
 615         NTSTATUS status;
 616
 617         status = packet_fd_read(conn->pkt);
 618
 619         if (!NT_STATUS_IS_OK(status)) {
 620                 DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
 621                 cluster_fatal("ctdbd died\n");
 622         }
 623
 624         while (packet_handler(conn->pkt, ctdb_req_complete,
 625                               ctdb_handle_message, conn, &status)) {
 626                 if (!NT_STATUS_IS_OK(status)) {
 627                         DEBUG(10, ("could not handle incoming message: %s\n",
 628                                    nt_errstr(status)));
 629                 }
 630         }
 631 }
 632
 633 /*
 634  * Prepare a ctdbd connection to receive messages
 635  */
 636
 637 NTSTATUS ctdbd_register_msg_ctx(struct ctdbd_connection *conn,
 638                                 struct messaging_context *msg_ctx)
 639 {
 640         SMB_ASSERT(conn->msg_ctx == NULL);
 641         SMB_ASSERT(conn->fde == NULL);
 642
 643         if (!(conn->fde = event_add_fd(msg_ctx->event_ctx, conn,
 644                                        packet_get_fd(conn->pkt),
 645                                        EVENT_FD_READ,
 646                                        ctdbd_socket_handler,
 647                                        conn))) {
 648                 DEBUG(0, ("event_add_fd failed\n"));
 649                 return NT_STATUS_NO_MEMORY;
 650         }
 651
 652         conn->msg_ctx = msg_ctx;
 653
 654         return NT_STATUS_OK;
 655 }
 656
 657 /*
 658  * Send a messaging message across a ctdbd
 659  */
 660
 661 NTSTATUS ctdbd_messaging_send(struct ctdbd_connection *conn,
 662                               uint32 dst_vnn, uint64 dst_srvid,
 663                               struct messaging_rec *msg)
 664 {
 665         struct ctdb_req_message r;
 666         TALLOC_CTX *mem_ctx;
 667         DATA_BLOB blob;
 668         NTSTATUS status;
 669         enum ndr_err_code ndr_err;
 670
 671         if (!(mem_ctx = talloc_init("ctdbd_messaging_send"))) {
 672                 DEBUG(0, ("talloc failed\n"));
 673                 return NT_STATUS_NO_MEMORY;
 674         }
 675
 676         ndr_err = ndr_push_struct_blob(
 677                 &blob, mem_ctx, msg,
 678                 (ndr_push_flags_fn_t)ndr_push_messaging_rec);
 679
 680         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 681                 DEBUG(0, ("ndr_push_struct_blob failed: %s\n",
 682                           ndr_errstr(ndr_err)));
 683                 status = ndr_map_error2ntstatus(ndr_err);
 684                 goto fail;
 685         }
 686
 687         r.hdr.length = offsetof(struct ctdb_req_message, data) + blob.length;
 688         r.hdr.ctdb_magic = CTDB_MAGIC;
 689         r.hdr.ctdb_version = CTDB_VERSION;
 690         r.hdr.generation = 1;
 691         r.hdr.operation  = CTDB_REQ_MESSAGE;
 692         r.hdr.destnode   = dst_vnn;
 693         r.hdr.srcnode    = conn->our_vnn;
 694         r.hdr.reqid      = 0;
 695         r.srvid          = dst_srvid;
 696         r.datalen        = blob.length;
 697
 698         DEBUG(10, ("ctdbd_messaging_send: Sending ctdb packet\n"));
 699         ctdb_packet_dump(&r.hdr);
 700
 701         status = packet_send(
 702                 conn->pkt, 2,
 703                 data_blob_const(&r, offsetof(struct ctdb_req_message, data)),
 704                 blob);
 705
 706         if (!NT_STATUS_IS_OK(status)) {
 707                 DEBUG(0, ("packet_send failed: %s\n", nt_errstr(status)));
 708                 goto fail;
 709         }
 710
 711         status = packet_flush(conn->pkt);
 712
 713         if (!NT_STATUS_IS_OK(status)) {
 714                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 715                 cluster_fatal("cluster dispatch daemon msg write error\n");
 716         }
 717
 718         status = NT_STATUS_OK;
 719  fail:
 720         TALLOC_FREE(mem_ctx);
 721         return status;
 722 }
 723
 724 /*
 725  * send/recv a generic ctdb control message
 726  */
 727 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
 728                               uint32_t vnn, uint32 opcode,
 729                               uint64_t srvid, uint32_t flags,
 730                               TDB_DATA data,
 731                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
 732                               int *cstatus)
 733 {
 734         struct ctdb_req_control req;
 735         struct ctdb_reply_control *reply = NULL;
 736         struct ctdbd_connection *new_conn = NULL;
 737         NTSTATUS status;
 738
 739         /* the samba3 ctdb code can't handle NOREPLY yet */
 740         flags &= ~CTDB_CTRL_FLAG_NOREPLY;
 741
 742         if (conn == NULL) {
 743                 status = ctdbd_init_connection(NULL, &new_conn);
 744
 745                 if (!NT_STATUS_IS_OK(status)) {
 746                         DEBUG(10, ("Could not init temp connection: %s\n",
 747                                    nt_errstr(status)));
 748                         goto fail;
 749                 }
 750
 751                 conn = new_conn;
 752         }
 753
 754         ZERO_STRUCT(req);
 755         req.hdr.length = offsetof(struct ctdb_req_control, data) + data.dsize;
 756         req.hdr.ctdb_magic   = CTDB_MAGIC;
 757         req.hdr.ctdb_version = CTDB_VERSION;
 758         req.hdr.operation    = CTDB_REQ_CONTROL;
 759         req.hdr.reqid        = ++conn->reqid;
 760         req.hdr.destnode     = vnn;
 761         req.opcode           = opcode;
 762         req.srvid            = srvid;
 763         req.datalen          = data.dsize;
 764
 765         DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
 766         ctdb_packet_dump(&req.hdr);
 767
 768         status = packet_send(
 769                 conn->pkt, 2,
 770                 data_blob_const(&req, offsetof(struct ctdb_req_control, data)),
 771                 data_blob_const(data.dptr, data.dsize));
 772
 773         if (!NT_STATUS_IS_OK(status)) {
 774                 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
 775                 goto fail;
 776         }
 777
 778         status = packet_flush(conn->pkt);
 779
 780         if (!NT_STATUS_IS_OK(status)) {
 781                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 782                 cluster_fatal("cluster dispatch daemon control write error\n");
 783         }
 784
 785         if (flags & CTDB_CTRL_FLAG_NOREPLY) {
 786                 TALLOC_FREE(new_conn);
 787                 return NT_STATUS_OK;
 788         }
 789
 790         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
 791
 792         if (!NT_STATUS_IS_OK(status)) {
 793                 DEBUG(10, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 794                 goto fail;
 795         }
 796
 797         if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
 798                 DEBUG(0, ("received invalid reply\n"));
 799                 goto fail;
 800         }
 801
 802         if (outdata) {
 803                 if (!(outdata->dptr = (uint8 *)talloc_memdup(
 804                               mem_ctx, reply->data, reply->datalen))) {
 805                         TALLOC_FREE(reply);
 806                         return NT_STATUS_NO_MEMORY;
 807                 }
 808                 outdata->dsize = reply->datalen;
 809         }
 810         if (cstatus) {
 811                 (*cstatus) = reply->status;
 812         }
 813
 814         status = NT_STATUS_OK;
 815
 816  fail:
 817         TALLOC_FREE(new_conn);
 818         TALLOC_FREE(reply);
 819         return status;
 820 }
 821
 822 /*
 823  * see if a remote process exists
 824  */
 825 bool ctdbd_process_exists(struct ctdbd_connection *conn, uint32 vnn, pid_t pid)
 826 {
 827         NTSTATUS status;
 828         TDB_DATA data;
 829         int32_t cstatus;
 830
 831         data.dptr = (uint8_t*)&pid;
 832         data.dsize = sizeof(pid);
 833
 834         status = ctdbd_control(conn, vnn, CTDB_CONTROL_PROCESS_EXISTS, 0, 0,
 835                                data, NULL, NULL, &cstatus);
 836         if (!NT_STATUS_IS_OK(status)) {
 837                 DEBUG(0, (__location__ " ctdb_control for process_exists "
 838                           "failed\n"));
 839                 return False;
 840         }
 841
 842         return cstatus == 0;
 843 }
 844
 845 /*
 846  * Get a db path
 847  */
 848 char *ctdbd_dbpath(struct ctdbd_connection *conn,
 849                    TALLOC_CTX *mem_ctx, uint32_t db_id)
 850 {
 851         NTSTATUS status;
 852         TDB_DATA data;
 853         int32_t cstatus;
 854
 855         data.dptr = (uint8_t*)&db_id;
 856         data.dsize = sizeof(db_id);
 857
 858         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 859                                CTDB_CONTROL_GETDBPATH, 0, 0, data,
 860                                mem_ctx, &data, &cstatus);
 861         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
 862                 DEBUG(0,(__location__ " ctdb_control for getdbpath failed\n"));
 863                 return NULL;
 864         }
 865
 866         return (char *)data.dptr;
 867 }
 868
 869 /*
 870  * attach to a ctdb database
 871  */
 872 NTSTATUS ctdbd_db_attach(struct ctdbd_connection *conn,
 873                          const char *name, uint32_t *db_id, int tdb_flags)
 874 {
 875         NTSTATUS status;
 876         TDB_DATA data;
 877         int32_t cstatus;
 878         bool persistent = (tdb_flags & TDB_CLEAR_IF_FIRST) == 0;
 879
 880         data.dptr = (uint8_t*)name;
 881         data.dsize = strlen(name)+1;
 882
 883         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 884                                persistent
 885                                ? CTDB_CONTROL_DB_ATTACH_PERSISTENT
 886                                : CTDB_CONTROL_DB_ATTACH,
 887                                tdb_flags, 0, data, NULL, &data, &cstatus);
 888         if (!NT_STATUS_IS_OK(status)) {
 889                 DEBUG(0, (__location__ " ctdb_control for db_attach "
 890                           "failed: %s\n", nt_errstr(status)));
 891                 return status;
 892         }
 893
 894         if (cstatus != 0 || data.dsize != sizeof(uint32_t)) {
 895                 DEBUG(0,(__location__ " ctdb_control for db_attach failed\n"));
 896                 return NT_STATUS_INTERNAL_ERROR;
 897         }
 898
 899         *db_id = *(uint32_t *)data.dptr;
 900         talloc_free(data.dptr);
 901
 902         if (!(tdb_flags & TDB_SEQNUM)) {
 903                 return NT_STATUS_OK;
 904         }
 905
 906         data.dptr = (uint8_t *)db_id;
 907         data.dsize = sizeof(*db_id);
 908
 909         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 910                                CTDB_CONTROL_ENABLE_SEQNUM, 0, 0, data,
 911                                NULL, NULL, &cstatus);
 912         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
 913                 DEBUG(0,(__location__ " ctdb_control for enable seqnum "
 914                          "failed\n"));
 915                 return NT_STATUS_IS_OK(status) ? NT_STATUS_INTERNAL_ERROR :
 916                         status;
 917         }
 918
 919         return NT_STATUS_OK;
 920 }
 921
 922 /*
 923  * force the migration of a record to this node
 924  */
 925 NTSTATUS ctdbd_migrate(struct ctdbd_connection *conn, uint32 db_id,
 926                        TDB_DATA key)
 927 {
 928         struct ctdb_req_call req;
 929         struct ctdb_reply_call *reply;
 930         NTSTATUS status;
 931
 932         ZERO_STRUCT(req);
 933
 934         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
 935         req.hdr.ctdb_magic   = CTDB_MAGIC;
 936         req.hdr.ctdb_version = CTDB_VERSION;
 937         req.hdr.operation    = CTDB_REQ_CALL;
 938         req.hdr.reqid        = ++conn->reqid;
 939         req.flags            = CTDB_IMMEDIATE_MIGRATION;
 940         req.callid           = CTDB_NULL_FUNC;
 941         req.db_id            = db_id;
 942         req.keylen           = key.dsize;
 943
 944         DEBUG(10, ("ctdbd_migrate: Sending ctdb packet\n"));
 945         ctdb_packet_dump(&req.hdr);
 946
 947         status = packet_send(
 948                 conn->pkt, 2,
 949                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
 950                 data_blob_const(key.dptr, key.dsize));
 951
 952         if (!NT_STATUS_IS_OK(status)) {
 953                 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
 954                 return status;
 955         }
 956
 957         status = packet_flush(conn->pkt);
 958
 959         if (!NT_STATUS_IS_OK(status)) {
 960                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 961                 cluster_fatal("cluster dispatch daemon control write error\n");
 962         }
 963
 964         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
 965
 966         if (!NT_STATUS_IS_OK(status)) {
 967                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 968                 goto fail;
 969         }
 970
 971         if (reply->hdr.operation != CTDB_REPLY_CALL) {
 972                 DEBUG(0, ("received invalid reply\n"));
 973                 status = NT_STATUS_INTERNAL_ERROR;
 974                 goto fail;
 975         }
 976
 977         status = NT_STATUS_OK;
 978  fail:
 979
 980         TALLOC_FREE(reply);
 981         return status;
 982 }
 983
 984 /*
 985  * remotely fetch a record without locking it or forcing a migration
 986  */
 987 NTSTATUS ctdbd_fetch(struct ctdbd_connection *conn, uint32 db_id,
 988                      TDB_DATA key, TALLOC_CTX *mem_ctx, TDB_DATA *data)
 989 {
 990         struct ctdb_req_call req;
 991         struct ctdb_reply_call *reply;
 992         NTSTATUS status;
 993
 994         ZERO_STRUCT(req);
 995
 996         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
 997         req.hdr.ctdb_magic   = CTDB_MAGIC;
 998         req.hdr.ctdb_version = CTDB_VERSION;
 999         req.hdr.operation    = CTDB_REQ_CALL;
1000         req.hdr.reqid        = ++conn->reqid;
1001         req.flags            = 0;
1002         req.callid           = CTDB_FETCH_FUNC;
1003         req.db_id            = db_id;
1004         req.keylen           = key.dsize;
1005
1006         status = packet_send(
1007                 conn->pkt, 2,
1008                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
1009                 data_blob_const(key.dptr, key.dsize));
1010
1011         if (!NT_STATUS_IS_OK(status)) {
1012                 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
1013                 return status;
1014         }
1015
1016         status = packet_flush(conn->pkt);
1017
1018         if (!NT_STATUS_IS_OK(status)) {
1019                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
1020                 cluster_fatal("cluster dispatch daemon control write error\n");
1021         }
1022
1023         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
1024
1025         if (!NT_STATUS_IS_OK(status)) {
1026                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1027                 goto fail;
1028         }
1029
1030         if (reply->hdr.operation != CTDB_REPLY_CALL) {
1031                 DEBUG(0, ("received invalid reply\n"));
1032                 status = NT_STATUS_INTERNAL_ERROR;
1033                 goto fail;
1034         }
1035
1036         data->dsize = reply->datalen;
1037         if (data->dsize == 0) {
1038                 data->dptr = NULL;
1039                 goto done;
1040         }
1041
1042         data->dptr = (uint8 *)talloc_memdup(mem_ctx, &reply->data[0],
1043                                             reply->datalen);
1044         if (data->dptr == NULL) {
1045                 DEBUG(0, ("talloc failed\n"));
1046                 status = NT_STATUS_NO_MEMORY;
1047                 goto fail;
1048         }
1049
1050  done:
1051         status = NT_STATUS_OK;
1052  fail:
1053         TALLOC_FREE(reply);
1054         return status;
1055 }
1056
1057 struct ctdbd_traverse_state {
1058         void (*fn)(TDB_DATA key, TDB_DATA data, void *private_data);
1059         void *private_data;
1060 };
1061
1062 /*
1063  * Handle a traverse record coming in on the ctdbd connection
1064  */
1065
1066 static NTSTATUS ctdb_traverse_handler(uint8_t *buf, size_t length,
1067                                       void *private_data)
1068 {
1069         struct ctdbd_traverse_state *state =
1070                 (struct ctdbd_traverse_state *)private_data;
1071
1072         struct ctdb_req_message *m;
1073         struct ctdb_rec_data *d;
1074         TDB_DATA key, data;
1075
1076         m = (struct ctdb_req_message *)buf;
1077
1078         if (length < sizeof(*m) || m->hdr.length != length) {
1079                 DEBUG(0, ("Got invalid message of length %d\n", (int)length));
1080                 TALLOC_FREE(buf);
1081                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1082         }
1083
1084         d = (struct ctdb_rec_data *)&m->data[0];
1085         if (m->datalen < sizeof(uint32_t) || m->datalen != d->length) {
1086                 DEBUG(0, ("Got invalid traverse data of length %d\n",
1087                           (int)m->datalen));
1088                 TALLOC_FREE(buf);
1089                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1090         }
1091
1092         key.dsize = d->keylen;
1093         key.dptr  = &d->data[0];
1094         data.dsize = d->datalen;
1095         data.dptr = &d->data[d->keylen];
1096
1097         if (key.dsize == 0 && data.dsize == 0) {
1098                 /* end of traverse */
1099                 return NT_STATUS_END_OF_FILE;
1100         }
1101
1102         if (data.dsize < sizeof(struct ctdb_ltdb_header)) {
1103                 DEBUG(0, ("Got invalid ltdb header length %d\n",
1104                           (int)data.dsize));
1105                 TALLOC_FREE(buf);
1106                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1107         }
1108         data.dsize -= sizeof(struct ctdb_ltdb_header);
1109         data.dptr += sizeof(struct ctdb_ltdb_header);
1110
1111         if (state->fn) {
1112                 state->fn(key, data, state->private_data);
1113         }
1114
1115         TALLOC_FREE(buf);
1116         return NT_STATUS_OK;
1117 }
1118
1119 /*
1120   Traverse a ctdb database. This uses a kind-of hackish way to open a second
1121   connection to ctdbd to avoid the hairy recursive and async problems with
1122   everything in-line.
1123 */
1124
1125 NTSTATUS ctdbd_traverse(uint32 db_id,
1126                         void (*fn)(TDB_DATA key, TDB_DATA data,
1127                                    void *private_data),
1128                         void *private_data)
1129 {
1130         struct ctdbd_connection *conn;
1131         NTSTATUS status;
1132
1133         TDB_DATA data;
1134         struct ctdb_traverse_start t;
1135         int cstatus;
1136         struct ctdbd_traverse_state state;
1137
1138         status = ctdbd_init_connection(NULL, &conn);
1139         if (!NT_STATUS_IS_OK(status)) {
1140                 DEBUG(0, ("ctdbd_init_connection failed: %s\n",
1141                           nt_errstr(status)));
1142                 return status;
1143         }
1144
1145         t.db_id = db_id;
1146         t.srvid = conn->rand_srvid;
1147         t.reqid = ++conn->reqid;
1148
1149         data.dptr = (uint8_t *)&t;
1150         data.dsize = sizeof(t);
1151
1152         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1153                                CTDB_CONTROL_TRAVERSE_START, conn->rand_srvid, 0,
1154                                data, NULL, NULL, &cstatus);
1155
1156         if (!NT_STATUS_IS_OK(status) || (cstatus != 0)) {
1157
1158                 DEBUG(0,("ctdbd_control failed: %s, %d\n", nt_errstr(status),
1159                          cstatus));
1160
1161                 if (NT_STATUS_IS_OK(status)) {
1162                         /*
1163                          * We need a mapping here
1164                          */
1165                         status = NT_STATUS_UNSUCCESSFUL;
1166                 }
1167                 goto done;
1168         }
1169
1170         state.fn = fn;
1171         state.private_data = private_data;
1172
1173         while (True) {
1174
1175                 status = NT_STATUS_OK;
1176
1177                 if (packet_handler(conn->pkt, ctdb_req_complete,
1178                                    ctdb_traverse_handler, &state, &status)) {
1179
1180                         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1181                                 status = NT_STATUS_OK;
1182                                 break;
1183                         }
1184
1185                         /*
1186                          * There might be more in the queue
1187                          */
1188                         continue;
1189                 }
1190
1191                 if (!NT_STATUS_IS_OK(status)) {
1192                         break;
1193                 }
1194
1195                 status = ctdb_packet_fd_read_sync(conn->pkt);
1196
1197                 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1198                         /*
1199                          * There might be more in the queue
1200                          */
1201                         continue;
1202                 }
1203
1204                 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1205                         status = NT_STATUS_OK;
1206                         break;
1207                 }
1208
1209                 if (!NT_STATUS_IS_OK(status)) {
1210                         DEBUG(0, ("packet_fd_read_sync failed: %s\n", nt_errstr(status)));
1211                         cluster_fatal("ctdbd died\n");
1212                 }
1213         }
1214
1215  done:
1216         TALLOC_FREE(conn);
1217         return status;
1218 }
1219
1220 /*
1221    This is used to canonicalize a ctdb_sock_addr structure.
1222 */
1223 static void smbd_ctdb_canonicalize_ip(const struct sockaddr_storage *in,
1224                                       struct sockaddr_storage *out)
1225 {
1226         memcpy(out, in, sizeof (*out));
1227
1228 #ifdef HAVE_IPV6
1229         if (in->ss_family == AF_INET6) {
1230                 const char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
1231                 const struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)in;
1232                 struct sockaddr_in *out4 = (struct sockaddr_in *)out;
1233                 if (memcmp(&in6->sin6_addr, prefix, 12) == 0) {
1234                         memset(out, 0, sizeof(*out));
1235 #ifdef HAVE_SOCK_SIN_LEN
1236                         out4->sin_len = sizeof(*out);
1237 #endif
1238                         out4->sin_family = AF_INET;
1239                         out4->sin_port   = in6->sin6_port;
1240                         memcpy(&out4->sin_addr, &in6->sin6_addr.s6_addr32[3], 4);
1241                 }
1242         }
1243 #endif
1244 }
1245
1246 /*
1247  * Register us as a server for a particular tcp connection
1248  */
1249
1250 NTSTATUS ctdbd_register_ips(struct ctdbd_connection *conn,
1251                             const struct sockaddr_storage *_server,
1252                             const struct sockaddr_storage *_client,
1253                             void (*release_ip_handler)(const char *ip_addr,
1254                                                        void *private_data),
1255                             void *private_data)
1256 {
1257         /*
1258          * we still use ctdb_control_tcp for ipv4
1259          * because we want to work against older ctdb
1260          * versions at runtime
1261          */
1262         struct ctdb_control_tcp p4;
1263 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1264         struct ctdb_control_tcp_addr p;
1265 #endif
1266         TDB_DATA data;
1267         NTSTATUS status;
1268         struct sockaddr_storage client;
1269         struct sockaddr_storage server;
1270
1271         /*
1272          * Only one connection so far
1273          */
1274         SMB_ASSERT(conn->release_ip_handler == NULL);
1275
1276         smbd_ctdb_canonicalize_ip(_client, &client);
1277         smbd_ctdb_canonicalize_ip(_server, &server);
1278
1279         switch (client.ss_family) {
1280         case AF_INET:
1281                 p4.dest = *(struct sockaddr_in *)(void *)&server;
1282                 p4.src = *(struct sockaddr_in *)(void *)&client;
1283                 data.dptr = (uint8_t *)&p4;
1284                 data.dsize = sizeof(p4);
1285                 break;
1286 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1287         case AF_INET6:
1288                 p.dest.ip6 = *(struct sockaddr_in6 *)(void *)&server;
1289                 p.src.ip6 = *(struct sockaddr_in6 *)(void *)&client;
1290                 data.dptr = (uint8_t *)&p;
1291                 data.dsize = sizeof(p);
1292                 break;
1293 #endif
1294         default:
1295                 return NT_STATUS_INTERNAL_ERROR;
1296         }
1297
1298         conn->release_ip_handler = release_ip_handler;
1299
1300         /*
1301          * We want to be told about IP releases
1302          */
1303
1304         status = register_with_ctdbd(conn, CTDB_SRVID_RELEASE_IP);
1305         if (!NT_STATUS_IS_OK(status)) {
1306                 return status;
1307         }
1308
1309         /*
1310          * inform ctdb of our tcp connection, so if IP takeover happens ctdb
1311          * can send an extra ack to trigger a reset for our client, so it
1312          * immediately reconnects
1313          */
1314         return ctdbd_control(conn, CTDB_CURRENT_NODE,
1315                              CTDB_CONTROL_TCP_CLIENT, 0,
1316                              CTDB_CTRL_FLAG_NOREPLY, data, NULL, NULL, NULL);
1317 }
1318
1319 /*
1320  * We want to handle reconfigure events
1321  */
1322 NTSTATUS ctdbd_register_reconfigure(struct ctdbd_connection *conn)
1323 {
1324         return register_with_ctdbd(conn, CTDB_SRVID_RECONFIGURE);
1325 }
1326
1327 /*
1328   call a control on the local node
1329  */
1330 NTSTATUS ctdbd_control_local(struct ctdbd_connection *conn, uint32 opcode,
1331                              uint64_t srvid, uint32_t flags, TDB_DATA data,
1332                              TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
1333                              int *cstatus)
1334 {
1335         return ctdbd_control(conn, CTDB_CURRENT_NODE, opcode, srvid, flags, data, mem_ctx, outdata, cstatus);
1336 }
1337
1338 NTSTATUS ctdb_watch_us(struct ctdbd_connection *conn)
1339 {
1340         struct ctdb_client_notify_register reg_data;
1341         size_t struct_len;
1342         NTSTATUS status;
1343         int cstatus;
1344
1345         reg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1346         reg_data.len = 1;
1347         reg_data.notify_data[0] = 0;
1348
1349         struct_len = offsetof(struct ctdb_client_notify_register,
1350                               notify_data) + reg_data.len;
1351
1352         status = ctdbd_control_local(
1353                 conn, CTDB_CONTROL_REGISTER_NOTIFY, conn->rand_srvid, 0,
1354                 make_tdb_data((uint8_t *)&reg_data, struct_len),
1355                 NULL, NULL, &cstatus);
1356         if (!NT_STATUS_IS_OK(status)) {
1357                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1358                           nt_errstr(status)));
1359         }
1360         return status;
1361 }
1362
1363 NTSTATUS ctdb_unwatch(struct ctdbd_connection *conn)
1364 {
1365         struct ctdb_client_notify_deregister dereg_data;
1366         NTSTATUS status;
1367         int cstatus;
1368
1369         dereg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1370
1371         status = ctdbd_control_local(
1372                 conn, CTDB_CONTROL_DEREGISTER_NOTIFY, conn->rand_srvid, 0,
1373                 make_tdb_data((uint8_t *)&dereg_data, sizeof(dereg_data)),
1374                 NULL, NULL, &cstatus);
1375         if (!NT_STATUS_IS_OK(status)) {
1376                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1377                           nt_errstr(status)));
1378         }
1379         return status;
1380 }
1381
1382 #endif