source3/lib/ctdbd_conn.c

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