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 #include "ctdbd_conn.h"
  28
  29 /* paths to these include files come from --with-ctdb= in configure */
  30 #include "ctdb.h"
  31 #include "ctdb_private.h"
  32
  33 struct ctdbd_connection {
  34         struct messaging_context *msg_ctx;
  35         uint32 reqid;
  36         uint32 our_vnn;
  37         uint64 rand_srvid;
  38         struct packet_context *pkt;
  39         struct fd_event *fde;
  40
  41         void (*release_ip_handler)(const char *ip_addr, void *private_data);
  42         void *release_ip_priv;
  43 };
  44
  45 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
  46                               uint32_t vnn, uint32 opcode,
  47                               uint64_t srvid, uint32_t flags, TDB_DATA data,
  48                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
  49                               int *cstatus);
  50
  51 /*
  52  * exit on fatal communications errors with the ctdbd daemon
  53  */
  54 static void cluster_fatal(const char *why)
  55 {
  56         DEBUG(0,("cluster fatal event: %s - exiting immediately\n", why));
  57         /* we don't use smb_panic() as we don't want to delay to write
  58            a core file. We need to release this process id immediately
  59            so that someone else can take over without getting sharing
  60            violations */
  61         _exit(0);
  62 }
  63
  64 /*
  65  *
  66  */
  67 static void ctdb_packet_dump(struct ctdb_req_header *hdr)
  68 {
  69         if (DEBUGLEVEL < 10) {
  70                 return;
  71         }
  72         DEBUGADD(10, ("len=%d, magic=%x, vers=%d, gen=%d, op=%d, reqid=%d\n",
  73                       (int)hdr->length, (int)hdr->ctdb_magic,
  74                       (int)hdr->ctdb_version, (int)hdr->generation,
  75                       (int)hdr->operation, (int)hdr->reqid));
  76 }
  77
  78 /*
  79  * Register a srvid with ctdbd
  80  */
  81 static NTSTATUS register_with_ctdbd(struct ctdbd_connection *conn,
  82                                     uint64_t srvid)
  83 {
  84
  85         int cstatus;
  86         return ctdbd_control(conn, CTDB_CURRENT_NODE,
  87                              CTDB_CONTROL_REGISTER_SRVID, srvid, 0,
  88                              tdb_null, NULL, NULL, &cstatus);
  89 }
  90
  91 /*
  92  * get our vnn from the cluster
  93  */
  94 static NTSTATUS get_cluster_vnn(struct ctdbd_connection *conn, uint32 *vnn)
  95 {
  96         int32_t cstatus=-1;
  97         NTSTATUS status;
  98         status = ctdbd_control(conn,
  99                                CTDB_CURRENT_NODE, CTDB_CONTROL_GET_PNN, 0, 0,
 100                                tdb_null, NULL, NULL, &cstatus);
 101         if (!NT_STATUS_IS_OK(status)) {
 102                 cluster_fatal("ctdbd_control failed\n");
 103         }
 104         *vnn = (uint32_t)cstatus;
 105         return status;
 106 }
 107
 108 uint32 ctdbd_vnn(const struct ctdbd_connection *conn)
 109 {
 110         return conn->our_vnn;
 111 }
 112
 113 /*
 114  * Get us a ctdb connection
 115  */
 116
 117 static NTSTATUS ctdbd_connect(TALLOC_CTX *mem_ctx,
 118                               struct packet_context **presult)
 119 {
 120         struct packet_context *result;
 121         const char *sockname = lp_ctdbd_socket();
 122         struct sockaddr_un addr;
 123         int fd;
 124
 125         if (!sockname || !*sockname) {
 126                 sockname = CTDB_PATH;
 127         }
 128
 129         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 130         if (fd == -1) {
 131                 DEBUG(3, ("Could not create socket: %s\n", strerror(errno)));
 132                 return map_nt_error_from_unix(errno);
 133         }
 134
 135         ZERO_STRUCT(addr);
 136         addr.sun_family = AF_UNIX;
 137         strncpy(addr.sun_path, sockname, sizeof(addr.sun_path));
 138
 139         if (sys_connect(fd, (struct sockaddr *)(void *)&addr) == -1) {
 140                 DEBUG(1, ("connect(%s) failed: %s\n", sockname,
 141                           strerror(errno)));
 142                 close(fd);
 143                 return map_nt_error_from_unix(errno);
 144         }
 145
 146         if (!(result = packet_init(mem_ctx, fd))) {
 147                 close(fd);
 148                 return NT_STATUS_NO_MEMORY;
 149         }
 150
 151         *presult = result;
 152         return NT_STATUS_OK;
 153 }
 154
 155 /*
 156  * Do we have a complete ctdb packet in the queue?
 157  */
 158
 159 static bool ctdb_req_complete(const uint8_t *buf, size_t available,
 160                               size_t *length,
 161                               void *private_data)
 162 {
 163         uint32 msglen;
 164
 165         if (available < sizeof(msglen)) {
 166                 return False;
 167         }
 168
 169         msglen = *((uint32 *)buf);
 170
 171         DEBUG(10, ("msglen = %d\n", msglen));
 172
 173         if (msglen < sizeof(struct ctdb_req_header)) {
 174                 DEBUG(0, ("Got invalid msglen: %d, expected at least %d for "
 175                           "the req_header\n", (int)msglen,
 176                           (int)sizeof(struct ctdb_req_header)));
 177                 cluster_fatal("ctdbd protocol error\n");
 178         }
 179
 180         if (available < msglen) {
 181                 return false;
 182         }
 183
 184         *length = msglen;
 185         return true;
 186 }
 187
 188 /*
 189  * State necessary to defer an incoming message while we are waiting for a
 190  * ctdb reply.
 191  */
 192
 193 struct deferred_msg_state {
 194         struct messaging_context *msg_ctx;
 195         struct messaging_rec *rec;
 196 };
 197
 198 /*
 199  * Timed event handler for the deferred message
 200  */
 201
 202 static void deferred_message_dispatch(struct event_context *event_ctx,
 203                                       struct timed_event *te,
 204                                       struct timeval now,
 205                                       void *private_data)
 206 {
 207         struct deferred_msg_state *state = talloc_get_type_abort(
 208                 private_data, struct deferred_msg_state);
 209
 210         messaging_dispatch_rec(state->msg_ctx, state->rec);
 211         TALLOC_FREE(state);
 212         TALLOC_FREE(te);
 213 }
 214
 215 struct req_pull_state {
 216         TALLOC_CTX *mem_ctx;
 217         DATA_BLOB req;
 218 };
 219
 220 /*
 221  * Pull a ctdb request out of the incoming packet queue
 222  */
 223
 224 static NTSTATUS ctdb_req_pull(uint8_t *buf, size_t length,
 225                               void *private_data)
 226 {
 227         struct req_pull_state *state = (struct req_pull_state *)private_data;
 228
 229         state->req.data = talloc_move(state->mem_ctx, &buf);
 230         state->req.length = length;
 231         return NT_STATUS_OK;
 232 }
 233
 234 /*
 235  * Fetch a messaging_rec from an incoming ctdb style message
 236  */
 237
 238 static struct messaging_rec *ctdb_pull_messaging_rec(TALLOC_CTX *mem_ctx,
 239                                                      size_t overall_length,
 240                                                      struct ctdb_req_message *msg)
 241 {
 242         struct messaging_rec *result;
 243         DATA_BLOB blob;
 244         enum ndr_err_code ndr_err;
 245
 246         if ((overall_length < offsetof(struct ctdb_req_message, data))
 247             || (overall_length
 248                 < offsetof(struct ctdb_req_message, data) + msg->datalen)) {
 249
 250                 cluster_fatal("got invalid msg length");
 251         }
 252
 253         if (!(result = TALLOC_P(mem_ctx, struct messaging_rec))) {
 254                 DEBUG(0, ("talloc failed\n"));
 255                 return NULL;
 256         }
 257
 258         blob = data_blob_const(msg->data, msg->datalen);
 259
 260         ndr_err = ndr_pull_struct_blob(
 261                 &blob, result, result,
 262                 (ndr_pull_flags_fn_t)ndr_pull_messaging_rec);
 263
 264         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 265                 DEBUG(0, ("ndr_pull_struct_blob failed: %s\n",
 266                           ndr_errstr(ndr_err)));
 267                 TALLOC_FREE(result);
 268                 return NULL;
 269         }
 270
 271         if (DEBUGLEVEL >= 10) {
 272                 DEBUG(10, ("ctdb_pull_messaging_rec:\n"));
 273                 NDR_PRINT_DEBUG(messaging_rec, result);
 274         }
 275
 276         return result;
 277 }
 278
 279 static NTSTATUS ctdb_packet_fd_read_sync(struct packet_context *ctx)
 280 {
 281         struct timeval timeout;
 282         struct timeval *ptimeout;
 283
 284         timeout = timeval_set(lp_ctdb_timeout(), 0);
 285         ptimeout = (timeout.tv_sec != 0) ? &timeout : NULL;
 286
 287         return packet_fd_read_sync(ctx, ptimeout);
 288 }
 289
 290 /*
 291  * Read a full ctdbd request. If we have a messaging context, defer incoming
 292  * messages that might come in between.
 293  */
 294
 295 static NTSTATUS ctdb_read_req(struct ctdbd_connection *conn, uint32 reqid,
 296                               TALLOC_CTX *mem_ctx, void *result)
 297 {
 298         struct ctdb_req_header *hdr;
 299         struct req_pull_state state;
 300         NTSTATUS status;
 301
 302  again:
 303
 304         status = ctdb_packet_fd_read_sync(conn->pkt);
 305
 306         if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_BUSY)) {
 307                 /* EAGAIN */
 308                 goto again;
 309         } else if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 310                 /* EAGAIN */
 311                 goto again;
 312         }
 313
 314         if (!NT_STATUS_IS_OK(status)) {
 315                 DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
 316                 cluster_fatal("ctdbd died\n");
 317         }
 318
 319  next_pkt:
 320
 321         ZERO_STRUCT(state);
 322         state.mem_ctx = mem_ctx;
 323
 324         if (!packet_handler(conn->pkt, ctdb_req_complete, ctdb_req_pull,
 325                             &state, &status)) {
 326                 /*
 327                  * Not enough data
 328                  */
 329                 DEBUG(10, ("not enough data from ctdb socket, retrying\n"));
 330                 goto again;
 331         }
 332
 333         if (!NT_STATUS_IS_OK(status)) {
 334                 DEBUG(0, ("Could not read packet: %s\n", nt_errstr(status)));
 335                 cluster_fatal("ctdbd died\n");
 336         }
 337
 338         hdr = (struct ctdb_req_header *)state.req.data;
 339
 340         DEBUG(10, ("Received ctdb packet\n"));
 341         ctdb_packet_dump(hdr);
 342
 343         if (hdr->operation == CTDB_REQ_MESSAGE) {
 344                 struct timed_event *evt;
 345                 struct deferred_msg_state *msg_state;
 346                 struct ctdb_req_message *msg = (struct ctdb_req_message *)hdr;
 347
 348                 if (conn->msg_ctx == NULL) {
 349                         DEBUG(1, ("Got a message without having a msg ctx, "
 350                                   "dropping msg %llu\n",
 351                                   (long long unsigned)msg->srvid));
 352                         goto next_pkt;
 353                 }
 354
 355                 if ((conn->release_ip_handler != NULL)
 356                     && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 357                         /* must be dispatched immediately */
 358                         DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 359                         conn->release_ip_handler((const char *)msg->data,
 360                                                  conn->release_ip_priv);
 361                         TALLOC_FREE(hdr);
 362                         goto next_pkt;
 363                 }
 364
 365                 if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 366                     || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)) {
 367
 368                         DEBUG(1, ("ctdb_read_req: Got %s message\n",
 369                                   (msg->srvid == CTDB_SRVID_RECONFIGURE)
 370                                   ? "cluster reconfigure" : "SAMBA_NOTIFY"));
 371
 372                         messaging_send(conn->msg_ctx,
 373                                        messaging_server_id(conn->msg_ctx),
 374                                        MSG_SMB_BRL_VALIDATE, &data_blob_null);
 375                         messaging_send(conn->msg_ctx,
 376                                        messaging_server_id(conn->msg_ctx),
 377                                        MSG_DBWRAP_G_LOCK_RETRY,
 378                                        &data_blob_null);
 379                         TALLOC_FREE(hdr);
 380                         goto next_pkt;
 381                 }
 382
 383                 msg_state = TALLOC_P(NULL, struct deferred_msg_state);
 384                 if (msg_state == NULL) {
 385                         DEBUG(0, ("talloc failed\n"));
 386                         TALLOC_FREE(hdr);
 387                         goto next_pkt;
 388                 }
 389
 390                 if (!(msg_state->rec = ctdb_pull_messaging_rec(
 391                               msg_state, state.req.length, msg))) {
 392                         DEBUG(0, ("ctdbd_pull_messaging_rec failed\n"));
 393                         TALLOC_FREE(msg_state);
 394                         TALLOC_FREE(hdr);
 395                         goto next_pkt;
 396                 }
 397
 398                 TALLOC_FREE(hdr);
 399
 400                 msg_state->msg_ctx = conn->msg_ctx;
 401
 402                 /*
 403                  * We're waiting for a call reply, but an async message has
 404                  * crossed. Defer dispatching to the toplevel event loop.
 405                  */
 406                 evt = event_add_timed(conn->msg_ctx->event_ctx,
 407                                       conn->msg_ctx->event_ctx,
 408                                       timeval_zero(),
 409                                       deferred_message_dispatch,
 410                                       msg_state);
 411                 if (evt == NULL) {
 412                         DEBUG(0, ("event_add_timed failed\n"));
 413                         TALLOC_FREE(msg_state);
 414                         TALLOC_FREE(hdr);
 415                         goto next_pkt;
 416                 }
 417
 418                 goto next_pkt;
 419         }
 420
 421         if (hdr->reqid != reqid) {
 422                 /* we got the wrong reply */
 423                 DEBUG(0,("Discarding mismatched ctdb reqid %u should have "
 424                          "been %u\n", hdr->reqid, reqid));
 425                 TALLOC_FREE(hdr);
 426                 goto again;
 427         }
 428
 429         *((void **)result) = talloc_move(mem_ctx, &hdr);
 430
 431         return NT_STATUS_OK;
 432 }
 433
 434 /*
 435  * Get us a ctdbd connection
 436  */
 437
 438 static NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
 439                                       struct ctdbd_connection **pconn)
 440 {
 441         struct ctdbd_connection *conn;
 442         NTSTATUS status;
 443
 444         if (!(conn = TALLOC_ZERO_P(mem_ctx, struct ctdbd_connection))) {
 445                 DEBUG(0, ("talloc failed\n"));
 446                 return NT_STATUS_NO_MEMORY;
 447         }
 448
 449         status = ctdbd_connect(conn, &conn->pkt);
 450
 451         if (!NT_STATUS_IS_OK(status)) {
 452                 DEBUG(10, ("ctdbd_connect failed: %s\n", nt_errstr(status)));
 453                 goto fail;
 454         }
 455
 456         status = get_cluster_vnn(conn, &conn->our_vnn);
 457
 458         if (!NT_STATUS_IS_OK(status)) {
 459                 DEBUG(10, ("get_cluster_vnn failed: %s\n", nt_errstr(status)));
 460                 goto fail;
 461         }
 462
 463         generate_random_buffer((unsigned char *)&conn->rand_srvid,
 464                                sizeof(conn->rand_srvid));
 465
 466         status = register_with_ctdbd(conn, conn->rand_srvid);
 467
 468         if (!NT_STATUS_IS_OK(status)) {
 469                 DEBUG(5, ("Could not register random srvid: %s\n",
 470                           nt_errstr(status)));
 471                 goto fail;
 472         }
 473
 474         *pconn = conn;
 475         return NT_STATUS_OK;
 476
 477  fail:
 478         TALLOC_FREE(conn);
 479         return status;
 480 }
 481
 482 /*
 483  * Get us a ctdbd connection and register us as a process
 484  */
 485
 486 NTSTATUS ctdbd_messaging_connection(TALLOC_CTX *mem_ctx,
 487                                     struct ctdbd_connection **pconn)
 488 {
 489         struct ctdbd_connection *conn;
 490         NTSTATUS status;
 491
 492         status = ctdbd_init_connection(mem_ctx, &conn);
 493
 494         if (!NT_STATUS_IS_OK(status)) {
 495                 return status;
 496         }
 497
 498         status = register_with_ctdbd(conn, (uint64_t)sys_getpid());
 499         if (!NT_STATUS_IS_OK(status)) {
 500                 goto fail;
 501         }
 502
 503         status = register_with_ctdbd(conn, MSG_SRVID_SAMBA);
 504         if (!NT_STATUS_IS_OK(status)) {
 505                 goto fail;
 506         }
 507
 508         status = register_with_ctdbd(conn, CTDB_SRVID_SAMBA_NOTIFY);
 509         if (!NT_STATUS_IS_OK(status)) {
 510                 goto fail;
 511         }
 512
 513         *pconn = conn;
 514         return NT_STATUS_OK;
 515
 516  fail:
 517         TALLOC_FREE(conn);
 518         return status;
 519 }
 520
 521 struct messaging_context *ctdb_conn_msg_ctx(struct ctdbd_connection *conn)
 522 {
 523         return conn->msg_ctx;
 524 }
 525
 526 int ctdbd_conn_get_fd(struct ctdbd_connection *conn)
 527 {
 528         return packet_get_fd(conn->pkt);
 529 }
 530
 531 /*
 532  * Packet handler to receive and handle a ctdb message
 533  */
 534 static NTSTATUS ctdb_handle_message(uint8_t *buf, size_t length,
 535                                     void *private_data)
 536 {
 537         struct ctdbd_connection *conn = talloc_get_type_abort(
 538                 private_data, struct ctdbd_connection);
 539         struct ctdb_req_message *msg;
 540         struct messaging_rec *msg_rec;
 541
 542         msg = (struct ctdb_req_message *)buf;
 543
 544         if (msg->hdr.operation != CTDB_REQ_MESSAGE) {
 545                 DEBUG(0, ("Received async msg of type %u, discarding\n",
 546                           msg->hdr.operation));
 547                 TALLOC_FREE(buf);
 548                 return NT_STATUS_INVALID_PARAMETER;
 549         }
 550
 551         if ((conn->release_ip_handler != NULL)
 552             && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 553                 /* must be dispatched immediately */
 554                 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 555                 conn->release_ip_handler((const char *)msg->data,
 556                                          conn->release_ip_priv);
 557                 TALLOC_FREE(buf);
 558                 return NT_STATUS_OK;
 559         }
 560
 561         SMB_ASSERT(conn->msg_ctx != NULL);
 562
 563         if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 564             || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)){
 565                 DEBUG(0,("Got cluster reconfigure message\n"));
 566                 /*
 567                  * when the cluster is reconfigured or someone of the
 568                  * family has passed away (SAMBA_NOTIFY), we need to
 569                  * clean the brl database
 570                  */
 571                 messaging_send(conn->msg_ctx,
 572                                messaging_server_id(conn->msg_ctx),
 573                                MSG_SMB_BRL_VALIDATE, &data_blob_null);
 574
 575                 messaging_send(conn->msg_ctx,
 576                                messaging_server_id(conn->msg_ctx),
 577                                MSG_DBWRAP_G_LOCK_RETRY,
 578                                &data_blob_null);
 579
 580                 TALLOC_FREE(buf);
 581                 return NT_STATUS_OK;
 582         }
 583
 584         /* only messages to our pid or the broadcast are valid here */
 585         if (msg->srvid != sys_getpid() && msg->srvid != MSG_SRVID_SAMBA) {
 586                 DEBUG(0,("Got unexpected message with srvid=%llu\n",
 587                          (unsigned long long)msg->srvid));
 588                 TALLOC_FREE(buf);
 589                 return NT_STATUS_OK;
 590         }
 591
 592         if (!(msg_rec = ctdb_pull_messaging_rec(NULL, length, msg))) {
 593                 DEBUG(10, ("ctdb_pull_messaging_rec failed\n"));
 594                 TALLOC_FREE(buf);
 595                 return NT_STATUS_NO_MEMORY;
 596         }
 597
 598         messaging_dispatch_rec(conn->msg_ctx, msg_rec);
 599
 600         TALLOC_FREE(msg_rec);
 601         TALLOC_FREE(buf);
 602         return NT_STATUS_OK;
 603 }
 604
 605 /*
 606  * The ctdbd socket is readable asynchronuously
 607  */
 608
 609 static void ctdbd_socket_handler(struct event_context *event_ctx,
 610                                  struct fd_event *event,
 611                                  uint16 flags,
 612                                  void *private_data)
 613 {
 614         struct ctdbd_connection *conn = talloc_get_type_abort(
 615                 private_data, struct ctdbd_connection);
 616
 617         NTSTATUS status;
 618
 619         status = packet_fd_read(conn->pkt);
 620
 621         if (!NT_STATUS_IS_OK(status)) {
 622                 DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
 623                 cluster_fatal("ctdbd died\n");
 624         }
 625
 626         while (packet_handler(conn->pkt, ctdb_req_complete,
 627                               ctdb_handle_message, conn, &status)) {
 628                 if (!NT_STATUS_IS_OK(status)) {
 629                         DEBUG(10, ("could not handle incoming message: %s\n",
 630                                    nt_errstr(status)));
 631                 }
 632         }
 633 }
 634
 635 /*
 636  * Prepare a ctdbd connection to receive messages
 637  */
 638
 639 NTSTATUS ctdbd_register_msg_ctx(struct ctdbd_connection *conn,
 640                                 struct messaging_context *msg_ctx)
 641 {
 642         SMB_ASSERT(conn->msg_ctx == NULL);
 643         SMB_ASSERT(conn->fde == NULL);
 644
 645         if (!(conn->fde = event_add_fd(msg_ctx->event_ctx, conn,
 646                                        packet_get_fd(conn->pkt),
 647                                        EVENT_FD_READ,
 648                                        ctdbd_socket_handler,
 649                                        conn))) {
 650                 DEBUG(0, ("event_add_fd failed\n"));
 651                 return NT_STATUS_NO_MEMORY;
 652         }
 653
 654         conn->msg_ctx = msg_ctx;
 655
 656         return NT_STATUS_OK;
 657 }
 658
 659 /*
 660  * Send a messaging message across a ctdbd
 661  */
 662
 663 NTSTATUS ctdbd_messaging_send(struct ctdbd_connection *conn,
 664                               uint32 dst_vnn, uint64 dst_srvid,
 665                               struct messaging_rec *msg)
 666 {
 667         struct ctdb_req_message r;
 668         TALLOC_CTX *mem_ctx;
 669         DATA_BLOB blob;
 670         NTSTATUS status;
 671         enum ndr_err_code ndr_err;
 672
 673         if (!(mem_ctx = talloc_init("ctdbd_messaging_send"))) {
 674                 DEBUG(0, ("talloc failed\n"));
 675                 return NT_STATUS_NO_MEMORY;
 676         }
 677
 678         ndr_err = ndr_push_struct_blob(
 679                 &blob, mem_ctx, msg,
 680                 (ndr_push_flags_fn_t)ndr_push_messaging_rec);
 681
 682         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 683                 DEBUG(0, ("ndr_push_struct_blob failed: %s\n",
 684                           ndr_errstr(ndr_err)));
 685                 status = ndr_map_error2ntstatus(ndr_err);
 686                 goto fail;
 687         }
 688
 689         r.hdr.length = offsetof(struct ctdb_req_message, data) + blob.length;
 690         r.hdr.ctdb_magic = CTDB_MAGIC;
 691         r.hdr.ctdb_version = CTDB_VERSION;
 692         r.hdr.generation = 1;
 693         r.hdr.operation  = CTDB_REQ_MESSAGE;
 694         r.hdr.destnode   = dst_vnn;
 695         r.hdr.srcnode    = conn->our_vnn;
 696         r.hdr.reqid      = 0;
 697         r.srvid          = dst_srvid;
 698         r.datalen        = blob.length;
 699
 700         DEBUG(10, ("ctdbd_messaging_send: Sending ctdb packet\n"));
 701         ctdb_packet_dump(&r.hdr);
 702
 703         status = packet_send(
 704                 conn->pkt, 2,
 705                 data_blob_const(&r, offsetof(struct ctdb_req_message, data)),
 706                 blob);
 707
 708         if (!NT_STATUS_IS_OK(status)) {
 709                 DEBUG(0, ("packet_send failed: %s\n", nt_errstr(status)));
 710                 goto fail;
 711         }
 712
 713         status = packet_flush(conn->pkt);
 714
 715         if (!NT_STATUS_IS_OK(status)) {
 716                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 717                 cluster_fatal("cluster dispatch daemon msg write error\n");
 718         }
 719
 720         status = NT_STATUS_OK;
 721  fail:
 722         TALLOC_FREE(mem_ctx);
 723         return status;
 724 }
 725
 726 /*
 727  * send/recv a generic ctdb control message
 728  */
 729 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
 730                               uint32_t vnn, uint32 opcode,
 731                               uint64_t srvid, uint32_t flags,
 732                               TDB_DATA data,
 733                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
 734                               int *cstatus)
 735 {
 736         struct ctdb_req_control req;
 737         struct ctdb_reply_control *reply = NULL;
 738         struct ctdbd_connection *new_conn = NULL;
 739         NTSTATUS status;
 740
 741         /* the samba3 ctdb code can't handle NOREPLY yet */
 742         flags &= ~CTDB_CTRL_FLAG_NOREPLY;
 743
 744         if (conn == NULL) {
 745                 status = ctdbd_init_connection(NULL, &new_conn);
 746
 747                 if (!NT_STATUS_IS_OK(status)) {
 748                         DEBUG(10, ("Could not init temp connection: %s\n",
 749                                    nt_errstr(status)));
 750                         goto fail;
 751                 }
 752
 753                 conn = new_conn;
 754         }
 755
 756         ZERO_STRUCT(req);
 757         req.hdr.length = offsetof(struct ctdb_req_control, data) + data.dsize;
 758         req.hdr.ctdb_magic   = CTDB_MAGIC;
 759         req.hdr.ctdb_version = CTDB_VERSION;
 760         req.hdr.operation    = CTDB_REQ_CONTROL;
 761         req.hdr.reqid        = ++conn->reqid;
 762         req.hdr.destnode     = vnn;
 763         req.opcode           = opcode;
 764         req.srvid            = srvid;
 765         req.datalen          = data.dsize;
 766
 767         DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
 768         ctdb_packet_dump(&req.hdr);
 769
 770         status = packet_send(
 771                 conn->pkt, 2,
 772                 data_blob_const(&req, offsetof(struct ctdb_req_control, data)),
 773                 data_blob_const(data.dptr, data.dsize));
 774
 775         if (!NT_STATUS_IS_OK(status)) {
 776                 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
 777                 goto fail;
 778         }
 779
 780         status = packet_flush(conn->pkt);
 781
 782         if (!NT_STATUS_IS_OK(status)) {
 783                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 784                 cluster_fatal("cluster dispatch daemon control write error\n");
 785         }
 786
 787         if (flags & CTDB_CTRL_FLAG_NOREPLY) {
 788                 TALLOC_FREE(new_conn);
 789                 return NT_STATUS_OK;
 790         }
 791
 792         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
 793
 794         if (!NT_STATUS_IS_OK(status)) {
 795                 DEBUG(10, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 796                 goto fail;
 797         }
 798
 799         if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
 800                 DEBUG(0, ("received invalid reply\n"));
 801                 goto fail;
 802         }
 803
 804         if (outdata) {
 805                 if (!(outdata->dptr = (uint8 *)talloc_memdup(
 806                               mem_ctx, reply->data, reply->datalen))) {
 807                         TALLOC_FREE(reply);
 808                         return NT_STATUS_NO_MEMORY;
 809                 }
 810                 outdata->dsize = reply->datalen;
 811         }
 812         if (cstatus) {
 813                 (*cstatus) = reply->status;
 814         }
 815
 816         status = NT_STATUS_OK;
 817
 818  fail:
 819         TALLOC_FREE(new_conn);
 820         TALLOC_FREE(reply);
 821         return status;
 822 }
 823
 824 /*
 825  * see if a remote process exists
 826  */
 827 bool ctdbd_process_exists(struct ctdbd_connection *conn, uint32 vnn, pid_t pid)
 828 {
 829         NTSTATUS status;
 830         TDB_DATA data;
 831         int32_t cstatus;
 832
 833         data.dptr = (uint8_t*)&pid;
 834         data.dsize = sizeof(pid);
 835
 836         status = ctdbd_control(conn, vnn, CTDB_CONTROL_PROCESS_EXISTS, 0, 0,
 837                                data, NULL, NULL, &cstatus);
 838         if (!NT_STATUS_IS_OK(status)) {
 839                 DEBUG(0, (__location__ " ctdb_control for process_exists "
 840                           "failed\n"));
 841                 return False;
 842         }
 843
 844         return cstatus == 0;
 845 }
 846
 847 /*
 848  * Get a db path
 849  */
 850 char *ctdbd_dbpath(struct ctdbd_connection *conn,
 851                    TALLOC_CTX *mem_ctx, uint32_t db_id)
 852 {
 853         NTSTATUS status;
 854         TDB_DATA data;
 855         int32_t cstatus;
 856
 857         data.dptr = (uint8_t*)&db_id;
 858         data.dsize = sizeof(db_id);
 859
 860         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 861                                CTDB_CONTROL_GETDBPATH, 0, 0, data,
 862                                mem_ctx, &data, &cstatus);
 863         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
 864                 DEBUG(0,(__location__ " ctdb_control for getdbpath failed\n"));
 865                 return NULL;
 866         }
 867
 868         return (char *)data.dptr;
 869 }
 870
 871 /*
 872  * attach to a ctdb database
 873  */
 874 NTSTATUS ctdbd_db_attach(struct ctdbd_connection *conn,
 875                          const char *name, uint32_t *db_id, int tdb_flags)
 876 {
 877         NTSTATUS status;
 878         TDB_DATA data;
 879         int32_t cstatus;
 880         bool persistent = (tdb_flags & TDB_CLEAR_IF_FIRST) == 0;
 881
 882         data.dptr = (uint8_t*)name;
 883         data.dsize = strlen(name)+1;
 884
 885         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 886                                persistent
 887                                ? CTDB_CONTROL_DB_ATTACH_PERSISTENT
 888                                : CTDB_CONTROL_DB_ATTACH,
 889                                0, 0, data, NULL, &data, &cstatus);
 890         if (!NT_STATUS_IS_OK(status)) {
 891                 DEBUG(0, (__location__ " ctdb_control for db_attach "
 892                           "failed: %s\n", nt_errstr(status)));
 893                 return status;
 894         }
 895
 896         if (cstatus != 0 || data.dsize != sizeof(uint32_t)) {
 897                 DEBUG(0,(__location__ " ctdb_control for db_attach failed\n"));
 898                 return NT_STATUS_INTERNAL_ERROR;
 899         }
 900
 901         *db_id = *(uint32_t *)data.dptr;
 902         talloc_free(data.dptr);
 903
 904         if (!(tdb_flags & TDB_SEQNUM)) {
 905                 return NT_STATUS_OK;
 906         }
 907
 908         data.dptr = (uint8_t *)db_id;
 909         data.dsize = sizeof(*db_id);
 910
 911         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 912                                CTDB_CONTROL_ENABLE_SEQNUM, 0, 0, data,
 913                                NULL, NULL, &cstatus);
 914         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
 915                 DEBUG(0,(__location__ " ctdb_control for enable seqnum "
 916                          "failed\n"));
 917                 return NT_STATUS_IS_OK(status) ? NT_STATUS_INTERNAL_ERROR :
 918                         status;
 919         }
 920
 921         return NT_STATUS_OK;
 922 }
 923
 924 /*
 925  * force the migration of a record to this node
 926  */
 927 NTSTATUS ctdbd_migrate(struct ctdbd_connection *conn, uint32 db_id,
 928                        TDB_DATA key)
 929 {
 930         struct ctdb_req_call req;
 931         struct ctdb_reply_call *reply;
 932         NTSTATUS status;
 933
 934         ZERO_STRUCT(req);
 935
 936         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
 937         req.hdr.ctdb_magic   = CTDB_MAGIC;
 938         req.hdr.ctdb_version = CTDB_VERSION;
 939         req.hdr.operation    = CTDB_REQ_CALL;
 940         req.hdr.reqid        = ++conn->reqid;
 941         req.flags            = CTDB_IMMEDIATE_MIGRATION;
 942         req.callid           = CTDB_NULL_FUNC;
 943         req.db_id            = db_id;
 944         req.keylen           = key.dsize;
 945
 946         DEBUG(10, ("ctdbd_migrate: Sending ctdb packet\n"));
 947         ctdb_packet_dump(&req.hdr);
 948
 949         status = packet_send(
 950                 conn->pkt, 2,
 951                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
 952                 data_blob_const(key.dptr, key.dsize));
 953
 954         if (!NT_STATUS_IS_OK(status)) {
 955                 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
 956                 return status;
 957         }
 958
 959         status = packet_flush(conn->pkt);
 960
 961         if (!NT_STATUS_IS_OK(status)) {
 962                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 963                 cluster_fatal("cluster dispatch daemon control write error\n");
 964         }
 965
 966         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
 967
 968         if (!NT_STATUS_IS_OK(status)) {
 969                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 970                 goto fail;
 971         }
 972
 973         if (reply->hdr.operation != CTDB_REPLY_CALL) {
 974                 DEBUG(0, ("received invalid reply\n"));
 975                 status = NT_STATUS_INTERNAL_ERROR;
 976                 goto fail;
 977         }
 978
 979         status = NT_STATUS_OK;
 980  fail:
 981
 982         TALLOC_FREE(reply);
 983         return status;
 984 }
 985
 986 /*
 987  * remotely fetch a record without locking it or forcing a migration
 988  */
 989 NTSTATUS ctdbd_fetch(struct ctdbd_connection *conn, uint32 db_id,
 990                      TDB_DATA key, TALLOC_CTX *mem_ctx, TDB_DATA *data)
 991 {
 992         struct ctdb_req_call req;
 993         struct ctdb_reply_call *reply;
 994         NTSTATUS status;
 995
 996         ZERO_STRUCT(req);
 997
 998         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
 999         req.hdr.ctdb_magic   = CTDB_MAGIC;
1000         req.hdr.ctdb_version = CTDB_VERSION;
1001         req.hdr.operation    = CTDB_REQ_CALL;
1002         req.hdr.reqid        = ++conn->reqid;
1003         req.flags            = 0;
1004         req.callid           = CTDB_FETCH_FUNC;
1005         req.db_id            = db_id;
1006         req.keylen           = key.dsize;
1007
1008         status = packet_send(
1009                 conn->pkt, 2,
1010                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
1011                 data_blob_const(key.dptr, key.dsize));
1012
1013         if (!NT_STATUS_IS_OK(status)) {
1014                 DEBUG(3, ("packet_send failed: %s\n", nt_errstr(status)));
1015                 return status;
1016         }
1017
1018         status = packet_flush(conn->pkt);
1019
1020         if (!NT_STATUS_IS_OK(status)) {
1021                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
1022                 cluster_fatal("cluster dispatch daemon control write error\n");
1023         }
1024
1025         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
1026
1027         if (!NT_STATUS_IS_OK(status)) {
1028                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1029                 goto fail;
1030         }
1031
1032         if (reply->hdr.operation != CTDB_REPLY_CALL) {
1033                 DEBUG(0, ("received invalid reply\n"));
1034                 status = NT_STATUS_INTERNAL_ERROR;
1035                 goto fail;
1036         }
1037
1038         data->dsize = reply->datalen;
1039         if (data->dsize == 0) {
1040                 data->dptr = NULL;
1041                 goto done;
1042         }
1043
1044         data->dptr = (uint8 *)talloc_memdup(mem_ctx, &reply->data[0],
1045                                             reply->datalen);
1046         if (data->dptr == NULL) {
1047                 DEBUG(0, ("talloc failed\n"));
1048                 status = NT_STATUS_NO_MEMORY;
1049                 goto fail;
1050         }
1051
1052  done:
1053         status = NT_STATUS_OK;
1054  fail:
1055         TALLOC_FREE(reply);
1056         return status;
1057 }
1058
1059 struct ctdbd_traverse_state {
1060         void (*fn)(TDB_DATA key, TDB_DATA data, void *private_data);
1061         void *private_data;
1062 };
1063
1064 /*
1065  * Handle a traverse record coming in on the ctdbd connection
1066  */
1067
1068 static NTSTATUS ctdb_traverse_handler(uint8_t *buf, size_t length,
1069                                       void *private_data)
1070 {
1071         struct ctdbd_traverse_state *state =
1072                 (struct ctdbd_traverse_state *)private_data;
1073
1074         struct ctdb_req_message *m;
1075         struct ctdb_rec_data *d;
1076         TDB_DATA key, data;
1077
1078         m = (struct ctdb_req_message *)buf;
1079
1080         if (length < sizeof(*m) || m->hdr.length != length) {
1081                 DEBUG(0, ("Got invalid message of length %d\n", (int)length));
1082                 TALLOC_FREE(buf);
1083                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1084         }
1085
1086         d = (struct ctdb_rec_data *)&m->data[0];
1087         if (m->datalen < sizeof(uint32_t) || m->datalen != d->length) {
1088                 DEBUG(0, ("Got invalid traverse data of length %d\n",
1089                           (int)m->datalen));
1090                 TALLOC_FREE(buf);
1091                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1092         }
1093
1094         key.dsize = d->keylen;
1095         key.dptr  = &d->data[0];
1096         data.dsize = d->datalen;
1097         data.dptr = &d->data[d->keylen];
1098
1099         if (key.dsize == 0 && data.dsize == 0) {
1100                 /* end of traverse */
1101                 return NT_STATUS_END_OF_FILE;
1102         }
1103
1104         if (data.dsize < sizeof(struct ctdb_ltdb_header)) {
1105                 DEBUG(0, ("Got invalid ltdb header length %d\n",
1106                           (int)data.dsize));
1107                 TALLOC_FREE(buf);
1108                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1109         }
1110         data.dsize -= sizeof(struct ctdb_ltdb_header);
1111         data.dptr += sizeof(struct ctdb_ltdb_header);
1112
1113         if (state->fn) {
1114                 state->fn(key, data, state->private_data);
1115         }
1116
1117         TALLOC_FREE(buf);
1118         return NT_STATUS_OK;
1119 }
1120
1121 /*
1122   Traverse a ctdb database. This uses a kind-of hackish way to open a second
1123   connection to ctdbd to avoid the hairy recursive and async problems with
1124   everything in-line.
1125 */
1126
1127 NTSTATUS ctdbd_traverse(uint32 db_id,
1128                         void (*fn)(TDB_DATA key, TDB_DATA data,
1129                                    void *private_data),
1130                         void *private_data)
1131 {
1132         struct ctdbd_connection *conn;
1133         NTSTATUS status;
1134
1135         TDB_DATA data;
1136         struct ctdb_traverse_start t;
1137         int cstatus;
1138         struct ctdbd_traverse_state state;
1139
1140         status = ctdbd_init_connection(NULL, &conn);
1141         if (!NT_STATUS_IS_OK(status)) {
1142                 DEBUG(0, ("ctdbd_init_connection failed: %s\n",
1143                           nt_errstr(status)));
1144                 return status;
1145         }
1146
1147         t.db_id = db_id;
1148         t.srvid = conn->rand_srvid;
1149         t.reqid = ++conn->reqid;
1150
1151         data.dptr = (uint8_t *)&t;
1152         data.dsize = sizeof(t);
1153
1154         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1155                                CTDB_CONTROL_TRAVERSE_START, conn->rand_srvid, 0,
1156                                data, NULL, NULL, &cstatus);
1157
1158         if (!NT_STATUS_IS_OK(status) || (cstatus != 0)) {
1159
1160                 DEBUG(0,("ctdbd_control failed: %s, %d\n", nt_errstr(status),
1161                          cstatus));
1162
1163                 if (NT_STATUS_IS_OK(status)) {
1164                         /*
1165                          * We need a mapping here
1166                          */
1167                         status = NT_STATUS_UNSUCCESSFUL;
1168                 }
1169                 goto done;
1170         }
1171
1172         state.fn = fn;
1173         state.private_data = private_data;
1174
1175         while (True) {
1176
1177                 status = NT_STATUS_OK;
1178
1179                 if (packet_handler(conn->pkt, ctdb_req_complete,
1180                                    ctdb_traverse_handler, &state, &status)) {
1181
1182                         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1183                                 status = NT_STATUS_OK;
1184                                 break;
1185                         }
1186
1187                         /*
1188                          * There might be more in the queue
1189                          */
1190                         continue;
1191                 }
1192
1193                 if (!NT_STATUS_IS_OK(status)) {
1194                         break;
1195                 }
1196
1197                 status = ctdb_packet_fd_read_sync(conn->pkt);
1198
1199                 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1200                         /*
1201                          * There might be more in the queue
1202                          */
1203                         continue;
1204                 }
1205
1206                 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1207                         status = NT_STATUS_OK;
1208                         break;
1209                 }
1210
1211                 if (!NT_STATUS_IS_OK(status)) {
1212                         DEBUG(0, ("packet_fd_read_sync failed: %s\n", nt_errstr(status)));
1213                         cluster_fatal("ctdbd died\n");
1214                 }
1215         }
1216
1217  done:
1218         TALLOC_FREE(conn);
1219         return status;
1220 }
1221
1222 /*
1223    This is used to canonicalize a ctdb_sock_addr structure.
1224 */
1225 static void smbd_ctdb_canonicalize_ip(const struct sockaddr_storage *in,
1226                                       struct sockaddr_storage *out)
1227 {
1228         memcpy(out, in, sizeof (*out));
1229
1230 #ifdef HAVE_IPV6
1231         if (in->ss_family == AF_INET6) {
1232                 const char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
1233                 const struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)in;
1234                 struct sockaddr_in *out4 = (struct sockaddr_in *)out;
1235                 if (memcmp(&in6->sin6_addr, prefix, 12) == 0) {
1236                         memset(out, 0, sizeof(*out));
1237 #ifdef HAVE_SOCK_SIN_LEN
1238                         out4->sin_len = sizeof(*out);
1239 #endif
1240                         out4->sin_family = AF_INET;
1241                         out4->sin_port   = in6->sin6_port;
1242                         memcpy(&out4->sin_addr, &in6->sin6_addr.s6_addr32[3], 4);
1243                 }
1244         }
1245 #endif
1246 }
1247
1248 /*
1249  * Register us as a server for a particular tcp connection
1250  */
1251
1252 NTSTATUS ctdbd_register_ips(struct ctdbd_connection *conn,
1253                             const struct sockaddr_storage *_server,
1254                             const struct sockaddr_storage *_client,
1255                             void (*release_ip_handler)(const char *ip_addr,
1256                                                        void *private_data),
1257                             void *private_data)
1258 {
1259         /*
1260          * we still use ctdb_control_tcp for ipv4
1261          * because we want to work against older ctdb
1262          * versions at runtime
1263          */
1264         struct ctdb_control_tcp p4;
1265 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1266         struct ctdb_control_tcp_addr p;
1267 #endif
1268         TDB_DATA data;
1269         NTSTATUS status;
1270         struct sockaddr_storage client;
1271         struct sockaddr_storage server;
1272
1273         /*
1274          * Only one connection so far
1275          */
1276         SMB_ASSERT(conn->release_ip_handler == NULL);
1277
1278         smbd_ctdb_canonicalize_ip(_client, &client);
1279         smbd_ctdb_canonicalize_ip(_server, &server);
1280
1281         switch (client.ss_family) {
1282         case AF_INET:
1283                 p4.dest = *(struct sockaddr_in *)(void *)&server;
1284                 p4.src = *(struct sockaddr_in *)(void *)&client;
1285                 data.dptr = (uint8_t *)&p4;
1286                 data.dsize = sizeof(p4);
1287                 break;
1288 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1289         case AF_INET6:
1290                 p.dest.ip6 = *(struct sockaddr_in6 *)(void *)&server;
1291                 p.src.ip6 = *(struct sockaddr_in6 *)(void *)&client;
1292                 data.dptr = (uint8_t *)&p;
1293                 data.dsize = sizeof(p);
1294                 break;
1295 #endif
1296         default:
1297                 return NT_STATUS_INTERNAL_ERROR;
1298         }
1299
1300         conn->release_ip_handler = release_ip_handler;
1301
1302         /*
1303          * We want to be told about IP releases
1304          */
1305
1306         status = register_with_ctdbd(conn, CTDB_SRVID_RELEASE_IP);
1307         if (!NT_STATUS_IS_OK(status)) {
1308                 return status;
1309         }
1310
1311         /*
1312          * inform ctdb of our tcp connection, so if IP takeover happens ctdb
1313          * can send an extra ack to trigger a reset for our client, so it
1314          * immediately reconnects
1315          */
1316         return ctdbd_control(conn, CTDB_CURRENT_NODE,
1317                              CTDB_CONTROL_TCP_CLIENT, 0,
1318                              CTDB_CTRL_FLAG_NOREPLY, data, NULL, NULL, NULL);
1319 }
1320
1321 /*
1322  * We want to handle reconfigure events
1323  */
1324 NTSTATUS ctdbd_register_reconfigure(struct ctdbd_connection *conn)
1325 {
1326         return register_with_ctdbd(conn, CTDB_SRVID_RECONFIGURE);
1327 }
1328
1329 /*
1330   call a control on the local node
1331  */
1332 NTSTATUS ctdbd_control_local(struct ctdbd_connection *conn, uint32 opcode,
1333                              uint64_t srvid, uint32_t flags, TDB_DATA data,
1334                              TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
1335                              int *cstatus)
1336 {
1337         return ctdbd_control(conn, CTDB_CURRENT_NODE, opcode, srvid, flags, data, mem_ctx, outdata, cstatus);
1338 }
1339
1340 NTSTATUS ctdb_watch_us(struct ctdbd_connection *conn)
1341 {
1342         struct ctdb_client_notify_register reg_data;
1343         size_t struct_len;
1344         NTSTATUS status;
1345         int cstatus;
1346
1347         reg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1348         reg_data.len = 1;
1349         reg_data.notify_data[0] = 0;
1350
1351         struct_len = offsetof(struct ctdb_client_notify_register,
1352                               notify_data) + reg_data.len;
1353
1354         status = ctdbd_control_local(
1355                 conn, CTDB_CONTROL_REGISTER_NOTIFY, conn->rand_srvid, 0,
1356                 make_tdb_data((uint8_t *)&reg_data, struct_len),
1357                 NULL, NULL, &cstatus);
1358         if (!NT_STATUS_IS_OK(status)) {
1359                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1360                           nt_errstr(status)));
1361         }
1362         return status;
1363 }
1364
1365 NTSTATUS ctdb_unwatch(struct ctdbd_connection *conn)
1366 {
1367         struct ctdb_client_notify_deregister dereg_data;
1368         NTSTATUS status;
1369         int cstatus;
1370
1371         dereg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1372
1373         status = ctdbd_control_local(
1374                 conn, CTDB_CONTROL_DEREGISTER_NOTIFY, conn->rand_srvid, 0,
1375                 make_tdb_data((uint8_t *)&dereg_data, sizeof(dereg_data)),
1376                 NULL, NULL, &cstatus);
1377         if (!NT_STATUS_IS_OK(status)) {
1378                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1379                           nt_errstr(status)));
1380         }
1381         return status;
1382 }
1383
1384 #endif