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 #include "util_tdb.h"
  23 #include "serverid.h"
  24 #include "ctdbd_conn.h"
  25
  26 #ifdef CLUSTER_SUPPORT
  27
  28 #include "ctdb_packet.h"
  29 #include "messages.h"
  30
  31 /*
  32  * It is not possible to include ctdb.h and tdb_compat.h (included via
  33  * some other include above) without warnings. This fixes those
  34  * warnings.
  35  */
  36
  37 #ifdef typesafe_cb
  38 #undef typesafe_cb
  39 #endif
  40
  41 #ifdef typesafe_cb_preargs
  42 #undef typesafe_cb_preargs
  43 #endif
  44
  45 #ifdef typesafe_cb_postargs
  46 #undef typesafe_cb_postargs
  47 #endif
  48
  49 /* paths to these include files come from --with-ctdb= in configure */
  50
  51 #include "ctdb.h"
  52 #include "ctdb_private.h"
  53
  54 struct ctdbd_connection {
  55         struct messaging_context *msg_ctx;
  56         uint32_t reqid;
  57         uint32_t our_vnn;
  58         uint64_t rand_srvid;
  59         struct ctdb_packet_context *pkt;
  60         struct tevent_fd *fde;
  61
  62         bool (*release_ip_handler)(const char *ip_addr, void *private_data);
  63         void *release_ip_priv;
  64 };
  65
  66 static uint32_t ctdbd_next_reqid(struct ctdbd_connection *conn)
  67 {
  68         conn->reqid += 1;
  69         if (conn->reqid == 0) {
  70                 conn->reqid += 1;
  71         }
  72         return conn->reqid;
  73 }
  74
  75 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
  76                               uint32_t vnn, uint32_t opcode,
  77                               uint64_t srvid, uint32_t flags, TDB_DATA data,
  78                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
  79                               int *cstatus);
  80
  81 /*
  82  * exit on fatal communications errors with the ctdbd daemon
  83  */
  84 static void cluster_fatal(const char *why)
  85 {
  86         DEBUG(0,("cluster fatal event: %s - exiting immediately\n", why));
  87         /* we don't use smb_panic() as we don't want to delay to write
  88            a core file. We need to release this process id immediately
  89            so that someone else can take over without getting sharing
  90            violations */
  91         _exit(1);
  92 }
  93
  94 /*
  95  *
  96  */
  97 static void ctdb_packet_dump(struct ctdb_req_header *hdr)
  98 {
  99         if (DEBUGLEVEL < 11) {
 100                 return;
 101         }
 102         DEBUGADD(11, ("len=%d, magic=%x, vers=%d, gen=%d, op=%d, reqid=%d\n",
 103                       (int)hdr->length, (int)hdr->ctdb_magic,
 104                       (int)hdr->ctdb_version, (int)hdr->generation,
 105                       (int)hdr->operation, (int)hdr->reqid));
 106 }
 107
 108 /*
 109  * Register a srvid with ctdbd
 110  */
 111 NTSTATUS register_with_ctdbd(struct ctdbd_connection *conn, uint64_t srvid)
 112 {
 113
 114         int cstatus;
 115         return ctdbd_control(conn, CTDB_CURRENT_NODE,
 116                              CTDB_CONTROL_REGISTER_SRVID, srvid, 0,
 117                              tdb_null, NULL, NULL, &cstatus);
 118 }
 119
 120 /*
 121  * get our vnn from the cluster
 122  */
 123 static NTSTATUS get_cluster_vnn(struct ctdbd_connection *conn, uint32_t *vnn)
 124 {
 125         int32_t cstatus=-1;
 126         NTSTATUS status;
 127         status = ctdbd_control(conn,
 128                                CTDB_CURRENT_NODE, CTDB_CONTROL_GET_PNN, 0, 0,
 129                                tdb_null, NULL, NULL, &cstatus);
 130         if (!NT_STATUS_IS_OK(status)) {
 131                 DEBUG(1, ("ctdbd_control failed: %s\n", nt_errstr(status)));
 132                 return status;
 133         }
 134         *vnn = (uint32_t)cstatus;
 135         return status;
 136 }
 137
 138 /*
 139  * Are we active (i.e. not banned or stopped?)
 140  */
 141 static bool ctdbd_working(struct ctdbd_connection *conn, uint32_t vnn)
 142 {
 143         int32_t cstatus=-1;
 144         NTSTATUS status;
 145         TDB_DATA outdata;
 146         struct ctdb_node_map *m;
 147         uint32_t failure_flags;
 148         bool ret = false;
 149         int i;
 150
 151         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 152                                CTDB_CONTROL_GET_NODEMAP, 0, 0,
 153                                tdb_null, talloc_tos(), &outdata, &cstatus);
 154         if (!NT_STATUS_IS_OK(status)) {
 155                 DEBUG(1, ("ctdbd_control failed: %s\n", nt_errstr(status)));
 156                 return false;
 157         }
 158         if ((cstatus != 0) || (outdata.dptr == NULL)) {
 159                 DEBUG(2, ("Received invalid ctdb data\n"));
 160                 return false;
 161         }
 162
 163         m = (struct ctdb_node_map *)outdata.dptr;
 164
 165         for (i=0; i<m->num; i++) {
 166                 if (vnn == m->nodes[i].pnn) {
 167                         break;
 168                 }
 169         }
 170
 171         if (i == m->num) {
 172                 DEBUG(2, ("Did not find ourselves (node %d) in nodemap\n",
 173                           (int)vnn));
 174                 goto fail;
 175         }
 176
 177         failure_flags = NODE_FLAGS_BANNED | NODE_FLAGS_DISCONNECTED
 178                 | NODE_FLAGS_PERMANENTLY_DISABLED | NODE_FLAGS_STOPPED;
 179
 180         if ((m->nodes[i].flags & failure_flags) != 0) {
 181                 DEBUG(2, ("Node has status %x, not active\n",
 182                           (int)m->nodes[i].flags));
 183                 goto fail;
 184         }
 185
 186         ret = true;
 187 fail:
 188         TALLOC_FREE(outdata.dptr);
 189         return ret;
 190 }
 191
 192 uint32_t ctdbd_vnn(const struct ctdbd_connection *conn)
 193 {
 194         return conn->our_vnn;
 195 }
 196
 197 /*
 198  * Get us a ctdb connection
 199  */
 200
 201 static NTSTATUS ctdbd_connect(TALLOC_CTX *mem_ctx,
 202                               struct ctdb_packet_context **presult)
 203 {
 204         struct ctdb_packet_context *result;
 205         const char *sockname = lp_ctdbd_socket();
 206         struct sockaddr_un addr = { 0, };
 207         int fd;
 208         socklen_t salen;
 209
 210         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 211         if (fd == -1) {
 212                 DEBUG(3, ("Could not create socket: %s\n", strerror(errno)));
 213                 return map_nt_error_from_unix(errno);
 214         }
 215
 216         addr.sun_family = AF_UNIX;
 217         snprintf(addr.sun_path, sizeof(addr.sun_path), "%s", sockname);
 218
 219         salen = sizeof(struct sockaddr_un);
 220         if (connect(fd, (struct sockaddr *)(void *)&addr, salen) == -1) {
 221                 DEBUG(1, ("connect(%s) failed: %s\n", sockname,
 222                           strerror(errno)));
 223                 close(fd);
 224                 return map_nt_error_from_unix(errno);
 225         }
 226
 227         if (!(result = ctdb_packet_init(mem_ctx, fd))) {
 228                 close(fd);
 229                 return NT_STATUS_NO_MEMORY;
 230         }
 231
 232         *presult = result;
 233         return NT_STATUS_OK;
 234 }
 235
 236 /*
 237  * Do we have a complete ctdb packet in the queue?
 238  */
 239
 240 static bool ctdb_req_complete(const uint8_t *buf, size_t available,
 241                               size_t *length,
 242                               void *private_data)
 243 {
 244         uint32_t msglen;
 245
 246         if (available < sizeof(msglen)) {
 247                 return False;
 248         }
 249
 250         msglen = *((const uint32_t *)buf);
 251
 252         DEBUG(11, ("msglen = %d\n", msglen));
 253
 254         if (msglen < sizeof(struct ctdb_req_header)) {
 255                 DEBUG(0, ("Got invalid msglen: %d, expected at least %d for "
 256                           "the req_header\n", (int)msglen,
 257                           (int)sizeof(struct ctdb_req_header)));
 258                 cluster_fatal("ctdbd protocol error\n");
 259         }
 260
 261         if (available < msglen) {
 262                 return false;
 263         }
 264
 265         *length = msglen;
 266         return true;
 267 }
 268
 269 /*
 270  * State necessary to defer an incoming message while we are waiting for a
 271  * ctdb reply.
 272  */
 273
 274 struct deferred_msg_state {
 275         struct messaging_context *msg_ctx;
 276         struct messaging_rec *rec;
 277 };
 278
 279 /*
 280  * Timed event handler for the deferred message
 281  */
 282
 283 static void deferred_message_dispatch(struct tevent_context *event_ctx,
 284                                       struct tevent_timer *te,
 285                                       struct timeval now,
 286                                       void *private_data)
 287 {
 288         struct deferred_msg_state *state = talloc_get_type_abort(
 289                 private_data, struct deferred_msg_state);
 290
 291         messaging_dispatch_rec(state->msg_ctx, state->rec);
 292         TALLOC_FREE(state);
 293         TALLOC_FREE(te);
 294 }
 295
 296 struct req_pull_state {
 297         TALLOC_CTX *mem_ctx;
 298         DATA_BLOB req;
 299 };
 300
 301 /*
 302  * Pull a ctdb request out of the incoming ctdb_packet queue
 303  */
 304
 305 static NTSTATUS ctdb_req_pull(uint8_t *buf, size_t length,
 306                               void *private_data)
 307 {
 308         struct req_pull_state *state = (struct req_pull_state *)private_data;
 309
 310         state->req.data = talloc_move(state->mem_ctx, &buf);
 311         state->req.length = length;
 312         return NT_STATUS_OK;
 313 }
 314
 315 /*
 316  * Fetch a messaging_rec from an incoming ctdb style message
 317  */
 318
 319 static struct messaging_rec *ctdb_pull_messaging_rec(TALLOC_CTX *mem_ctx,
 320                                                      size_t overall_length,
 321                                                      struct ctdb_req_message *msg)
 322 {
 323         struct messaging_rec *result;
 324         DATA_BLOB blob;
 325         enum ndr_err_code ndr_err;
 326
 327         if ((overall_length < offsetof(struct ctdb_req_message, data))
 328             || (overall_length
 329                 < offsetof(struct ctdb_req_message, data) + msg->datalen)) {
 330
 331                 cluster_fatal("got invalid msg length");
 332         }
 333
 334         if (!(result = talloc(mem_ctx, struct messaging_rec))) {
 335                 DEBUG(0, ("talloc failed\n"));
 336                 return NULL;
 337         }
 338
 339         blob = data_blob_const(msg->data, msg->datalen);
 340
 341         ndr_err = ndr_pull_struct_blob(
 342                 &blob, result, result,
 343                 (ndr_pull_flags_fn_t)ndr_pull_messaging_rec);
 344
 345         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 346                 DEBUG(0, ("ndr_pull_struct_blob failed: %s\n",
 347                           ndr_errstr(ndr_err)));
 348                 TALLOC_FREE(result);
 349                 return NULL;
 350         }
 351
 352         if (DEBUGLEVEL >= 11) {
 353                 DEBUG(11, ("ctdb_pull_messaging_rec:\n"));
 354                 NDR_PRINT_DEBUG(messaging_rec, result);
 355         }
 356
 357         return result;
 358 }
 359
 360 static NTSTATUS ctdb_packet_fd_read_sync(struct ctdb_packet_context *ctx)
 361 {
 362         int timeout = lp_ctdb_timeout();
 363
 364         if (timeout == 0) {
 365                 timeout = -1;
 366         }
 367         return ctdb_packet_fd_read_sync_timeout(ctx, timeout);
 368 }
 369
 370 /*
 371  * Read a full ctdbd request. If we have a messaging context, defer incoming
 372  * messages that might come in between.
 373  */
 374
 375 static NTSTATUS ctdb_read_req(struct ctdbd_connection *conn, uint32_t reqid,
 376                               TALLOC_CTX *mem_ctx, void *result)
 377 {
 378         struct ctdb_req_header *hdr;
 379         struct req_pull_state state;
 380         NTSTATUS status;
 381
 382  next_pkt:
 383         ZERO_STRUCT(state);
 384         state.mem_ctx = mem_ctx;
 385
 386         while (!ctdb_packet_handler(conn->pkt, ctdb_req_complete,
 387                                     ctdb_req_pull, &state, &status)) {
 388                 /*
 389                  * Not enough data
 390                  */
 391                 status = ctdb_packet_fd_read_sync(conn->pkt);
 392
 393                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_BUSY)) {
 394                         /* EAGAIN */
 395                         continue;
 396                 } else if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 397                         /* EAGAIN */
 398                         continue;
 399                 }
 400
 401                 if (!NT_STATUS_IS_OK(status)) {
 402                         DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
 403                         cluster_fatal("ctdbd died\n");
 404                 }
 405         }
 406
 407         if (!NT_STATUS_IS_OK(status)) {
 408                 DEBUG(0, ("Could not read ctdb_packet: %s\n", nt_errstr(status)));
 409                 cluster_fatal("ctdbd died\n");
 410         }
 411
 412         hdr = (struct ctdb_req_header *)state.req.data;
 413
 414         DEBUG(11, ("Received ctdb packet\n"));
 415         ctdb_packet_dump(hdr);
 416
 417         if (hdr->operation == CTDB_REQ_MESSAGE) {
 418                 struct tevent_timer *evt;
 419                 struct deferred_msg_state *msg_state;
 420                 struct ctdb_req_message *msg = (struct ctdb_req_message *)hdr;
 421
 422                 if (conn->msg_ctx == NULL) {
 423                         DEBUG(1, ("Got a message without having a msg ctx, "
 424                                   "dropping msg %llu\n",
 425                                   (long long unsigned)msg->srvid));
 426                         goto next_pkt;
 427                 }
 428
 429                 if ((conn->release_ip_handler != NULL)
 430                     && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 431                         bool ret;
 432
 433                         /* must be dispatched immediately */
 434                         DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 435                         ret = conn->release_ip_handler((const char *)msg->data,
 436                                                        conn->release_ip_priv);
 437                         if (ret) {
 438                                 /*
 439                                  * We need to release the ip,
 440                                  * so return an error to the upper layers.
 441                                  *
 442                                  * We make sure we don't trigger this again.
 443                                  */
 444                                 conn->release_ip_handler = NULL;
 445                                 conn->release_ip_priv = NULL;
 446                                 return NT_STATUS_ADDRESS_CLOSED;
 447                         }
 448                         TALLOC_FREE(hdr);
 449                         goto next_pkt;
 450                 }
 451
 452                 if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 453                     || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)) {
 454
 455                         DEBUG(1, ("ctdb_read_req: Got %s message\n",
 456                                   (msg->srvid == CTDB_SRVID_RECONFIGURE)
 457                                   ? "cluster reconfigure" : "SAMBA_NOTIFY"));
 458
 459                         messaging_send(conn->msg_ctx,
 460                                        messaging_server_id(conn->msg_ctx),
 461                                        MSG_SMB_BRL_VALIDATE, &data_blob_null);
 462                         messaging_send(conn->msg_ctx,
 463                                        messaging_server_id(conn->msg_ctx),
 464                                        MSG_DBWRAP_G_LOCK_RETRY,
 465                                        &data_blob_null);
 466                         TALLOC_FREE(hdr);
 467                         goto next_pkt;
 468                 }
 469
 470                 msg_state = talloc(NULL, struct deferred_msg_state);
 471                 if (msg_state == NULL) {
 472                         DEBUG(0, ("talloc failed\n"));
 473                         TALLOC_FREE(hdr);
 474                         goto next_pkt;
 475                 }
 476
 477                 if (!(msg_state->rec = ctdb_pull_messaging_rec(
 478                               msg_state, state.req.length, msg))) {
 479                         DEBUG(0, ("ctdbd_pull_messaging_rec failed\n"));
 480                         TALLOC_FREE(msg_state);
 481                         TALLOC_FREE(hdr);
 482                         goto next_pkt;
 483                 }
 484
 485                 TALLOC_FREE(hdr);
 486
 487                 msg_state->msg_ctx = conn->msg_ctx;
 488
 489                 /*
 490                  * We're waiting for a call reply, but an async message has
 491                  * crossed. Defer dispatching to the toplevel event loop.
 492                  */
 493                 evt = tevent_add_timer(conn->msg_ctx->event_ctx,
 494                                       conn->msg_ctx->event_ctx,
 495                                       timeval_zero(),
 496                                       deferred_message_dispatch,
 497                                       msg_state);
 498                 if (evt == NULL) {
 499                         DEBUG(0, ("event_add_timed failed\n"));
 500                         TALLOC_FREE(msg_state);
 501                         TALLOC_FREE(hdr);
 502                         goto next_pkt;
 503                 }
 504
 505                 goto next_pkt;
 506         }
 507
 508         if ((reqid != 0) && (hdr->reqid != reqid)) {
 509                 /* we got the wrong reply */
 510                 DEBUG(0,("Discarding mismatched ctdb reqid %u should have "
 511                          "been %u\n", hdr->reqid, reqid));
 512                 TALLOC_FREE(hdr);
 513                 goto next_pkt;
 514         }
 515
 516         *((void **)result) = talloc_move(mem_ctx, &hdr);
 517
 518         return NT_STATUS_OK;
 519 }
 520
 521 /*
 522  * Get us a ctdbd connection
 523  */
 524
 525 static NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
 526                                       struct ctdbd_connection **pconn)
 527 {
 528         struct ctdbd_connection *conn;
 529         NTSTATUS status;
 530
 531         if (!(conn = talloc_zero(mem_ctx, struct ctdbd_connection))) {
 532                 DEBUG(0, ("talloc failed\n"));
 533                 return NT_STATUS_NO_MEMORY;
 534         }
 535
 536         status = ctdbd_connect(conn, &conn->pkt);
 537
 538         if (!NT_STATUS_IS_OK(status)) {
 539                 DEBUG(10, ("ctdbd_connect failed: %s\n", nt_errstr(status)));
 540                 goto fail;
 541         }
 542
 543         status = get_cluster_vnn(conn, &conn->our_vnn);
 544
 545         if (!NT_STATUS_IS_OK(status)) {
 546                 DEBUG(10, ("get_cluster_vnn failed: %s\n", nt_errstr(status)));
 547                 goto fail;
 548         }
 549
 550         if (!ctdbd_working(conn, conn->our_vnn)) {
 551                 DEBUG(2, ("Node is not working, can not connect\n"));
 552                 status = NT_STATUS_INTERNAL_DB_ERROR;
 553                 goto fail;
 554         }
 555
 556         generate_random_buffer((unsigned char *)&conn->rand_srvid,
 557                                sizeof(conn->rand_srvid));
 558
 559         status = register_with_ctdbd(conn, conn->rand_srvid);
 560
 561         if (!NT_STATUS_IS_OK(status)) {
 562                 DEBUG(5, ("Could not register random srvid: %s\n",
 563                           nt_errstr(status)));
 564                 goto fail;
 565         }
 566
 567         *pconn = conn;
 568         return NT_STATUS_OK;
 569
 570  fail:
 571         TALLOC_FREE(conn);
 572         return status;
 573 }
 574
 575 /*
 576  * Get us a ctdbd connection and register us as a process
 577  */
 578
 579 NTSTATUS ctdbd_messaging_connection(TALLOC_CTX *mem_ctx,
 580                                     struct ctdbd_connection **pconn)
 581 {
 582         struct ctdbd_connection *conn;
 583         NTSTATUS status;
 584
 585         status = ctdbd_init_connection(mem_ctx, &conn);
 586
 587         if (!NT_STATUS_IS_OK(status)) {
 588                 return status;
 589         }
 590
 591         status = register_with_ctdbd(conn, (uint64_t)getpid());
 592         if (!NT_STATUS_IS_OK(status)) {
 593                 goto fail;
 594         }
 595
 596         status = register_with_ctdbd(conn, MSG_SRVID_SAMBA);
 597         if (!NT_STATUS_IS_OK(status)) {
 598                 goto fail;
 599         }
 600
 601         status = register_with_ctdbd(conn, CTDB_SRVID_SAMBA_NOTIFY);
 602         if (!NT_STATUS_IS_OK(status)) {
 603                 goto fail;
 604         }
 605
 606         *pconn = conn;
 607         return NT_STATUS_OK;
 608
 609  fail:
 610         TALLOC_FREE(conn);
 611         return status;
 612 }
 613
 614 struct messaging_context *ctdb_conn_msg_ctx(struct ctdbd_connection *conn)
 615 {
 616         return conn->msg_ctx;
 617 }
 618
 619 int ctdbd_conn_get_fd(struct ctdbd_connection *conn)
 620 {
 621         return ctdb_packet_get_fd(conn->pkt);
 622 }
 623
 624 /*
 625  * Packet handler to receive and handle a ctdb message
 626  */
 627 static NTSTATUS ctdb_handle_message(uint8_t *buf, size_t length,
 628                                     void *private_data)
 629 {
 630         struct ctdbd_connection *conn = talloc_get_type_abort(
 631                 private_data, struct ctdbd_connection);
 632         struct ctdb_req_message *msg;
 633         struct messaging_rec *msg_rec;
 634
 635         msg = (struct ctdb_req_message *)buf;
 636
 637         if (msg->hdr.operation != CTDB_REQ_MESSAGE) {
 638                 DEBUG(0, ("Received async msg of type %u, discarding\n",
 639                           msg->hdr.operation));
 640                 TALLOC_FREE(buf);
 641                 return NT_STATUS_INVALID_PARAMETER;
 642         }
 643
 644         if ((conn->release_ip_handler != NULL)
 645             && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 646                 bool ret;
 647
 648                 /* must be dispatched immediately */
 649                 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 650                 ret = conn->release_ip_handler((const char *)msg->data,
 651                                                conn->release_ip_priv);
 652                 if (ret) {
 653                         /*
 654                          * We need to release the ip.
 655                          *
 656                          * We make sure we don't trigger this again.
 657                          */
 658                         conn->release_ip_handler = NULL;
 659                         conn->release_ip_priv = NULL;
 660                 }
 661                 TALLOC_FREE(buf);
 662                 return NT_STATUS_OK;
 663         }
 664
 665         SMB_ASSERT(conn->msg_ctx != NULL);
 666
 667         if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 668             || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)){
 669                 DEBUG(0,("Got cluster reconfigure message\n"));
 670                 /*
 671                  * when the cluster is reconfigured or someone of the
 672                  * family has passed away (SAMBA_NOTIFY), we need to
 673                  * clean the brl database
 674                  */
 675                 messaging_send(conn->msg_ctx,
 676                                messaging_server_id(conn->msg_ctx),
 677                                MSG_SMB_BRL_VALIDATE, &data_blob_null);
 678
 679                 messaging_send(conn->msg_ctx,
 680                                messaging_server_id(conn->msg_ctx),
 681                                MSG_DBWRAP_G_LOCK_RETRY,
 682                                &data_blob_null);
 683
 684                 TALLOC_FREE(buf);
 685                 return NT_STATUS_OK;
 686         }
 687
 688         /* only messages to our pid or the broadcast are valid here */
 689         if (msg->srvid != getpid() && msg->srvid != MSG_SRVID_SAMBA) {
 690                 DEBUG(0,("Got unexpected message with srvid=%llu\n",
 691                          (unsigned long long)msg->srvid));
 692                 TALLOC_FREE(buf);
 693                 return NT_STATUS_OK;
 694         }
 695
 696         if (!(msg_rec = ctdb_pull_messaging_rec(NULL, length, msg))) {
 697                 DEBUG(10, ("ctdb_pull_messaging_rec failed\n"));
 698                 TALLOC_FREE(buf);
 699                 return NT_STATUS_NO_MEMORY;
 700         }
 701
 702         messaging_dispatch_rec(conn->msg_ctx, msg_rec);
 703
 704         TALLOC_FREE(msg_rec);
 705         TALLOC_FREE(buf);
 706         return NT_STATUS_OK;
 707 }
 708
 709 /*
 710  * The ctdbd socket is readable asynchronuously
 711  */
 712
 713 static void ctdbd_socket_handler(struct tevent_context *event_ctx,
 714                                  struct tevent_fd *event,
 715                                  uint16 flags,
 716                                  void *private_data)
 717 {
 718         struct ctdbd_connection *conn = talloc_get_type_abort(
 719                 private_data, struct ctdbd_connection);
 720
 721         NTSTATUS status;
 722
 723         status = ctdb_packet_fd_read(conn->pkt);
 724
 725         if (!NT_STATUS_IS_OK(status)) {
 726                 DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
 727                 cluster_fatal("ctdbd died\n");
 728         }
 729
 730         while (ctdb_packet_handler(conn->pkt, ctdb_req_complete,
 731                               ctdb_handle_message, conn, &status)) {
 732                 if (!NT_STATUS_IS_OK(status)) {
 733                         DEBUG(10, ("could not handle incoming message: %s\n",
 734                                    nt_errstr(status)));
 735                 }
 736         }
 737 }
 738
 739 /*
 740  * Prepare a ctdbd connection to receive messages
 741  */
 742
 743 NTSTATUS ctdbd_register_msg_ctx(struct ctdbd_connection *conn,
 744                                 struct messaging_context *msg_ctx)
 745 {
 746         SMB_ASSERT(conn->msg_ctx == NULL);
 747         SMB_ASSERT(conn->fde == NULL);
 748
 749         if (!(conn->fde = tevent_add_fd(msg_ctx->event_ctx, conn,
 750                                        ctdb_packet_get_fd(conn->pkt),
 751                                        TEVENT_FD_READ,
 752                                        ctdbd_socket_handler,
 753                                        conn))) {
 754                 DEBUG(0, ("event_add_fd failed\n"));
 755                 return NT_STATUS_NO_MEMORY;
 756         }
 757
 758         conn->msg_ctx = msg_ctx;
 759
 760         return NT_STATUS_OK;
 761 }
 762
 763 /*
 764  * Send a messaging message across a ctdbd
 765  */
 766
 767 NTSTATUS ctdbd_messaging_send(struct ctdbd_connection *conn,
 768                               uint32_t dst_vnn, uint64_t dst_srvid,
 769                               struct messaging_rec *msg)
 770 {
 771         DATA_BLOB blob;
 772         NTSTATUS status;
 773         enum ndr_err_code ndr_err;
 774
 775         ndr_err = ndr_push_struct_blob(
 776                 &blob, talloc_tos(), msg,
 777                 (ndr_push_flags_fn_t)ndr_push_messaging_rec);
 778
 779         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 780                 DEBUG(0, ("ndr_push_struct_blob failed: %s\n",
 781                           ndr_errstr(ndr_err)));
 782                 return ndr_map_error2ntstatus(ndr_err);
 783         }
 784
 785         status = ctdbd_messaging_send_blob(conn, dst_vnn, dst_srvid,
 786                                            blob.data, blob.length);
 787         TALLOC_FREE(blob.data);
 788         return status;
 789 }
 790
 791 NTSTATUS ctdbd_messaging_send_blob(struct ctdbd_connection *conn,
 792                                    uint32_t dst_vnn, uint64_t dst_srvid,
 793                                    const uint8_t *buf, size_t buflen)
 794 {
 795         struct ctdb_req_message r;
 796         NTSTATUS status;
 797
 798         r.hdr.length = offsetof(struct ctdb_req_message, data) + buflen;
 799         r.hdr.ctdb_magic = CTDB_MAGIC;
 800         r.hdr.ctdb_version = CTDB_VERSION;
 801         r.hdr.generation = 1;
 802         r.hdr.operation  = CTDB_REQ_MESSAGE;
 803         r.hdr.destnode   = dst_vnn;
 804         r.hdr.srcnode    = conn->our_vnn;
 805         r.hdr.reqid      = 0;
 806         r.srvid          = dst_srvid;
 807         r.datalen        = buflen;
 808
 809         DEBUG(10, ("ctdbd_messaging_send: Sending ctdb packet\n"));
 810         ctdb_packet_dump(&r.hdr);
 811
 812         status = ctdb_packet_send(
 813                 conn->pkt, 2,
 814                 data_blob_const(&r, offsetof(struct ctdb_req_message, data)),
 815                 data_blob_const(buf, buflen));
 816
 817         if (!NT_STATUS_IS_OK(status)) {
 818                 DEBUG(0, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
 819                 return status;
 820         }
 821
 822         status = ctdb_packet_flush(conn->pkt);
 823         if (!NT_STATUS_IS_OK(status)) {
 824                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 825                 cluster_fatal("cluster dispatch daemon msg write error\n");
 826         }
 827         return NT_STATUS_OK;
 828 }
 829
 830 /*
 831  * send/recv a generic ctdb control message
 832  */
 833 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
 834                               uint32_t vnn, uint32_t opcode,
 835                               uint64_t srvid, uint32_t flags,
 836                               TDB_DATA data,
 837                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
 838                               int *cstatus)
 839 {
 840         struct ctdb_req_control req;
 841         struct ctdb_reply_control *reply = NULL;
 842         struct ctdbd_connection *new_conn = NULL;
 843         NTSTATUS status;
 844
 845         if (conn == NULL) {
 846                 status = ctdbd_init_connection(NULL, &new_conn);
 847
 848                 if (!NT_STATUS_IS_OK(status)) {
 849                         DEBUG(10, ("Could not init temp connection: %s\n",
 850                                    nt_errstr(status)));
 851                         goto fail;
 852                 }
 853
 854                 conn = new_conn;
 855         }
 856
 857         ZERO_STRUCT(req);
 858         req.hdr.length = offsetof(struct ctdb_req_control, data) + data.dsize;
 859         req.hdr.ctdb_magic   = CTDB_MAGIC;
 860         req.hdr.ctdb_version = CTDB_VERSION;
 861         req.hdr.operation    = CTDB_REQ_CONTROL;
 862         req.hdr.reqid        = ctdbd_next_reqid(conn);
 863         req.hdr.destnode     = vnn;
 864         req.opcode           = opcode;
 865         req.srvid            = srvid;
 866         req.datalen          = data.dsize;
 867         req.flags            = flags;
 868
 869         DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
 870         ctdb_packet_dump(&req.hdr);
 871
 872         status = ctdb_packet_send(
 873                 conn->pkt, 2,
 874                 data_blob_const(&req, offsetof(struct ctdb_req_control, data)),
 875                 data_blob_const(data.dptr, data.dsize));
 876
 877         if (!NT_STATUS_IS_OK(status)) {
 878                 DEBUG(3, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
 879                 goto fail;
 880         }
 881
 882         status = ctdb_packet_flush(conn->pkt);
 883
 884         if (!NT_STATUS_IS_OK(status)) {
 885                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 886                 cluster_fatal("cluster dispatch daemon control write error\n");
 887         }
 888
 889         if (flags & CTDB_CTRL_FLAG_NOREPLY) {
 890                 TALLOC_FREE(new_conn);
 891                 if (cstatus) {
 892                         *cstatus = 0;
 893                 }
 894                 return NT_STATUS_OK;
 895         }
 896
 897         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
 898
 899         if (!NT_STATUS_IS_OK(status)) {
 900                 DEBUG(10, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 901                 goto fail;
 902         }
 903
 904         if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
 905                 DEBUG(0, ("received invalid reply\n"));
 906                 goto fail;
 907         }
 908
 909         if (outdata) {
 910                 if (!(outdata->dptr = (uint8 *)talloc_memdup(
 911                               mem_ctx, reply->data, reply->datalen))) {
 912                         TALLOC_FREE(reply);
 913                         return NT_STATUS_NO_MEMORY;
 914                 }
 915                 outdata->dsize = reply->datalen;
 916         }
 917         if (cstatus) {
 918                 (*cstatus) = reply->status;
 919         }
 920
 921         status = NT_STATUS_OK;
 922
 923  fail:
 924         TALLOC_FREE(new_conn);
 925         TALLOC_FREE(reply);
 926         return status;
 927 }
 928
 929 /*
 930  * see if a remote process exists
 931  */
 932 bool ctdbd_process_exists(struct ctdbd_connection *conn, uint32_t vnn, pid_t pid)
 933 {
 934         struct server_id id;
 935         bool result;
 936
 937         id.pid = pid;
 938         id.vnn = vnn;
 939
 940         if (!ctdb_processes_exist(conn, &id, 1, &result)) {
 941                 DEBUG(10, ("ctdb_processes_exist failed\n"));
 942                 return false;
 943         }
 944         return result;
 945 }
 946
 947 bool ctdb_processes_exist(struct ctdbd_connection *conn,
 948                           const struct server_id *pids, int num_pids,
 949                           bool *results)
 950 {
 951         TALLOC_CTX *frame = talloc_stackframe();
 952         int i, num_received;
 953         NTSTATUS status;
 954         uint32_t *reqids;
 955         bool result = false;
 956
 957         reqids = talloc_array(talloc_tos(), uint32_t, num_pids);
 958         if (reqids == NULL) {
 959                 goto fail;
 960         }
 961
 962         for (i=0; i<num_pids; i++) {
 963                 struct ctdb_req_control req;
 964                 pid_t pid;
 965
 966                 results[i] = false;
 967                 reqids[i] = ctdbd_next_reqid(conn);
 968
 969                 ZERO_STRUCT(req);
 970
 971                 /*
 972                  * pids[i].pid is uint64_t, scale down to pid_t which
 973                  * is the wire protocol towards ctdb.
 974                  */
 975                 pid = pids[i].pid;
 976
 977                 DEBUG(10, ("Requesting PID %d/%d, reqid=%d\n",
 978                            (int)pids[i].vnn, (int)pid,
 979                            (int)reqids[i]));
 980
 981                 req.hdr.length = offsetof(struct ctdb_req_control, data);
 982                 req.hdr.length += sizeof(pid);
 983                 req.hdr.ctdb_magic   = CTDB_MAGIC;
 984                 req.hdr.ctdb_version = CTDB_VERSION;
 985                 req.hdr.operation    = CTDB_REQ_CONTROL;
 986                 req.hdr.reqid        = reqids[i];
 987                 req.hdr.destnode     = pids[i].vnn;
 988                 req.opcode           = CTDB_CONTROL_PROCESS_EXISTS;
 989                 req.srvid            = 0;
 990                 req.datalen          = sizeof(pid);
 991                 req.flags            = 0;
 992
 993                 DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
 994                 ctdb_packet_dump(&req.hdr);
 995
 996                 status = ctdb_packet_send(
 997                         conn->pkt, 2,
 998                         data_blob_const(
 999                                 &req, offsetof(struct ctdb_req_control, data)),
1000                         data_blob_const(&pid, sizeof(pid)));
1001                 if (!NT_STATUS_IS_OK(status)) {
1002                         DEBUG(10, ("ctdb_packet_send failed: %s\n",
1003                                    nt_errstr(status)));
1004                         goto fail;
1005                 }
1006         }
1007
1008         status = ctdb_packet_flush(conn->pkt);
1009         if (!NT_STATUS_IS_OK(status)) {
1010                 DEBUG(10, ("ctdb_packet_flush failed: %s\n",
1011                            nt_errstr(status)));
1012                 goto fail;
1013         }
1014
1015         num_received = 0;
1016
1017         while (num_received < num_pids) {
1018                 struct ctdb_reply_control *reply = NULL;
1019                 uint32_t reqid;
1020
1021                 status = ctdb_read_req(conn, 0, talloc_tos(), (void *)&reply);
1022                 if (!NT_STATUS_IS_OK(status)) {
1023                         DEBUG(10, ("ctdb_read_req failed: %s\n",
1024                                    nt_errstr(status)));
1025                         goto fail;
1026                 }
1027
1028                 if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
1029                         DEBUG(10, ("Received invalid reply\n"));
1030                         goto fail;
1031                 }
1032
1033                 reqid = reply->hdr.reqid;
1034
1035                 DEBUG(10, ("Received reqid %d\n", (int)reqid));
1036
1037                 for (i=0; i<num_pids; i++) {
1038                         if (reqid == reqids[i]) {
1039                                 break;
1040                         }
1041                 }
1042                 if (i == num_pids) {
1043                         DEBUG(10, ("Received unknown record number %u\n",
1044                                    (unsigned)reqid));
1045                         goto fail;
1046                 }
1047                 results[i] = ((reply->status) == 0);
1048                 TALLOC_FREE(reply);
1049                 num_received += 1;
1050         }
1051
1052         result = true;
1053 fail:
1054         TALLOC_FREE(frame);
1055         return result;
1056 }
1057
1058 struct ctdb_vnn_list {
1059         uint32_t vnn;
1060         uint32_t reqid;
1061         unsigned num_srvids;
1062         unsigned num_filled;
1063         uint64_t *srvids;
1064         unsigned *pid_indexes;
1065 };
1066
1067 /*
1068  * Get a list of all vnns mentioned in a list of
1069  * server_ids. vnn_indexes tells where in the vnns array we have to
1070  * place the pids.
1071  */
1072 static bool ctdb_collect_vnns(TALLOC_CTX *mem_ctx,
1073                               const struct server_id *pids, unsigned num_pids,
1074                               struct ctdb_vnn_list **pvnns,
1075                               unsigned *pnum_vnns)
1076 {
1077         struct ctdb_vnn_list *vnns = NULL;
1078         unsigned *vnn_indexes = NULL;
1079         unsigned i, num_vnns = 0;
1080
1081         vnn_indexes = talloc_array(mem_ctx, unsigned, num_pids);
1082         if (vnn_indexes == NULL) {
1083                 DEBUG(1, ("talloc_array failed\n"));
1084                 goto fail;
1085         }
1086
1087         for (i=0; i<num_pids; i++) {
1088                 unsigned j;
1089                 uint32_t vnn = pids[i].vnn;
1090
1091                 for (j=0; j<num_vnns; j++) {
1092                         if (vnn == vnns[j].vnn) {
1093                                 break;
1094                         }
1095                 }
1096                 vnn_indexes[i] = j;
1097
1098                 if (j < num_vnns) {
1099                         /*
1100                          * Already in the array
1101                          */
1102                         vnns[j].num_srvids += 1;
1103                         continue;
1104                 }
1105                 vnns = talloc_realloc(mem_ctx, vnns, struct ctdb_vnn_list,
1106                                       num_vnns+1);
1107                 if (vnns == NULL) {
1108                         DEBUG(1, ("talloc_realloc failed\n"));
1109                         goto fail;
1110                 }
1111                 vnns[num_vnns].vnn = vnn;
1112                 vnns[num_vnns].num_srvids = 1;
1113                 vnns[num_vnns].num_filled = 0;
1114                 num_vnns += 1;
1115         }
1116         for (i=0; i<num_vnns; i++) {
1117                 struct ctdb_vnn_list *vnn = &vnns[i];
1118
1119                 vnn->srvids = talloc_array(vnns, uint64_t, vnn->num_srvids);
1120                 if (vnn->srvids == NULL) {
1121                         DEBUG(1, ("talloc_array failed\n"));
1122                         goto fail;
1123                 }
1124                 vnn->pid_indexes = talloc_array(vnns, unsigned,
1125                                                 vnn->num_srvids);
1126                 if (vnn->pid_indexes == NULL) {
1127                         DEBUG(1, ("talloc_array failed\n"));
1128                         goto fail;
1129                 }
1130         }
1131         for (i=0; i<num_pids; i++) {
1132                 struct ctdb_vnn_list *vnn = &vnns[vnn_indexes[i]];
1133                 vnn->srvids[vnn->num_filled] = pids[i].unique_id;
1134                 vnn->pid_indexes[vnn->num_filled] = i;
1135                 vnn->num_filled += 1;
1136         }
1137
1138         TALLOC_FREE(vnn_indexes);
1139         *pvnns = vnns;
1140         *pnum_vnns = num_vnns;
1141         return true;
1142 fail:
1143         TALLOC_FREE(vnns);
1144         TALLOC_FREE(vnn_indexes);
1145         return false;
1146 }
1147
1148 bool ctdb_serverids_exist_supported(struct ctdbd_connection *conn)
1149 {
1150 #ifndef HAVE_CTDB_CONTROL_CHECK_SRVIDS_DECL
1151         return false;
1152 #else /* HAVE_CTDB_CONTROL_CHECK_SRVIDS_DECL */
1153         return true;
1154 #endif /* HAVE_CTDB_CONTROL_CHECK_SRVIDS_DECL */
1155 }
1156
1157 #ifdef HAVE_CTDB_CONTROL_CHECK_SRVIDS_DECL
1158
1159 bool ctdb_serverids_exist(struct ctdbd_connection *conn,
1160                           const struct server_id *pids, unsigned num_pids,
1161                           bool *results)
1162 {
1163         unsigned i, num_received;
1164         NTSTATUS status;
1165         struct ctdb_vnn_list *vnns = NULL;
1166         unsigned num_vnns;
1167         bool result = false;
1168
1169         if (!ctdb_collect_vnns(talloc_tos(), pids, num_pids,
1170                                &vnns, &num_vnns)) {
1171                 DEBUG(1, ("ctdb_collect_vnns failed\n"));
1172                 goto fail;
1173         }
1174
1175         for (i=0; i<num_vnns; i++) {
1176                 struct ctdb_vnn_list *vnn = &vnns[i];
1177                 struct ctdb_req_control req;
1178
1179                 vnn->reqid = ctdbd_next_reqid(conn);
1180
1181                 ZERO_STRUCT(req);
1182
1183                 DEBUG(10, ("Requesting VNN %d, reqid=%d, num_srvids=%u\n",
1184                            (int)vnn->vnn, (int)vnn->reqid, vnn->num_srvids));
1185
1186                 req.hdr.length = offsetof(struct ctdb_req_control, data);
1187                 req.hdr.ctdb_magic   = CTDB_MAGIC;
1188                 req.hdr.ctdb_version = CTDB_VERSION;
1189                 req.hdr.operation    = CTDB_REQ_CONTROL;
1190                 req.hdr.reqid        = vnn->reqid;
1191                 req.hdr.destnode     = vnn->vnn;
1192                 req.opcode           = CTDB_CONTROL_CHECK_SRVIDS;
1193                 req.srvid            = 0;
1194                 req.datalen          = sizeof(uint64_t) * vnn->num_srvids;
1195                 req.hdr.length      += req.datalen;
1196                 req.flags            = 0;
1197
1198                 DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
1199                 ctdb_packet_dump(&req.hdr);
1200
1201                 status = ctdb_packet_send(
1202                         conn->pkt, 2,
1203                         data_blob_const(
1204                                 &req, offsetof(struct ctdb_req_control,
1205                                                data)),
1206                         data_blob_const(vnn->srvids, req.datalen));
1207                 if (!NT_STATUS_IS_OK(status)) {
1208                         DEBUG(1, ("ctdb_packet_send failed: %s\n",
1209                                   nt_errstr(status)));
1210                         goto fail;
1211                 }
1212         }
1213
1214         status = ctdb_packet_flush(conn->pkt);
1215         if (!NT_STATUS_IS_OK(status)) {
1216                 DEBUG(1, ("ctdb_packet_flush failed: %s\n",
1217                           nt_errstr(status)));
1218                 goto fail;
1219         }
1220
1221         num_received = 0;
1222
1223         while (num_received < num_vnns) {
1224                 struct ctdb_reply_control *reply = NULL;
1225                 struct ctdb_vnn_list *vnn;
1226                 uint32_t reqid;
1227                 uint8_t *reply_data;
1228
1229                 status = ctdb_read_req(conn, 0, talloc_tos(), (void *)&reply);
1230                 if (!NT_STATUS_IS_OK(status)) {
1231                         DEBUG(1, ("ctdb_read_req failed: %s\n",
1232                                   nt_errstr(status)));
1233                         goto fail;
1234                 }
1235
1236                 if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
1237                         DEBUG(1, ("Received invalid reply %u\n",
1238                                   (unsigned)reply->hdr.operation));
1239                         goto fail;
1240                 }
1241
1242                 reqid = reply->hdr.reqid;
1243
1244                 DEBUG(10, ("Received reqid %d\n", (int)reqid));
1245
1246                 for (i=0; i<num_vnns; i++) {
1247                         if (reqid == vnns[i].reqid) {
1248                                 break;
1249                         }
1250                 }
1251                 if (i == num_vnns) {
1252                         DEBUG(1, ("Received unknown reqid number %u\n",
1253                                   (unsigned)reqid));
1254                         goto fail;
1255                 }
1256
1257                 DEBUG(10, ("Found index %u\n", i));
1258
1259                 vnn = &vnns[i];
1260
1261                 DEBUG(10, ("Received vnn %u, vnn->num_srvids %u, datalen %u\n",
1262                            (unsigned)vnn->vnn, vnn->num_srvids,
1263                            (unsigned)reply->datalen));
1264
1265                 if (reply->datalen >= ((vnn->num_srvids+7)/8)) {
1266                         /*
1267                          * Got a real reply
1268                          */
1269                         reply_data = reply->data;
1270                 } else {
1271                         /*
1272                          * Got an error reply
1273                          */
1274                         DEBUG(5, ("Received short reply len %d, status %u, "
1275                                   "errorlen %u\n",
1276                                   (unsigned)reply->datalen,
1277                                   (unsigned)reply->status,
1278                                   (unsigned)reply->errorlen));
1279                         dump_data(5, reply->data, reply->errorlen);
1280
1281                         /*
1282                          * This will trigger everything set to false
1283                          */
1284                         reply_data = NULL;
1285                 }
1286
1287                 for (i=0; i<vnn->num_srvids; i++) {
1288                         int idx = vnn->pid_indexes[i];
1289
1290                         if (pids[i].unique_id ==
1291                             SERVERID_UNIQUE_ID_NOT_TO_VERIFY) {
1292                                 results[idx] = true;
1293                                 continue;
1294                         }
1295                         results[idx] =
1296                                 (reply_data != NULL) &&
1297                                 ((reply_data[i/8] & (1<<(i%8))) != 0);
1298                 }
1299
1300                 TALLOC_FREE(reply);
1301                 num_received += 1;
1302         }
1303
1304         result = true;
1305 fail:
1306         TALLOC_FREE(vnns);
1307         return result;
1308 }
1309
1310 #endif /* HAVE_CTDB_CONTROL_CHECK_SRVIDS_DECL */
1311
1312 /*
1313  * Get a db path
1314  */
1315 char *ctdbd_dbpath(struct ctdbd_connection *conn,
1316                    TALLOC_CTX *mem_ctx, uint32_t db_id)
1317 {
1318         NTSTATUS status;
1319         TDB_DATA data;
1320         int32_t cstatus;
1321
1322         data.dptr = (uint8_t*)&db_id;
1323         data.dsize = sizeof(db_id);
1324
1325         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1326                                CTDB_CONTROL_GETDBPATH, 0, 0, data,
1327                                mem_ctx, &data, &cstatus);
1328         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
1329                 DEBUG(0,(__location__ " ctdb_control for getdbpath failed\n"));
1330                 return NULL;
1331         }
1332
1333         return (char *)data.dptr;
1334 }
1335
1336 /*
1337  * attach to a ctdb database
1338  */
1339 NTSTATUS ctdbd_db_attach(struct ctdbd_connection *conn,
1340                          const char *name, uint32_t *db_id, int tdb_flags)
1341 {
1342         NTSTATUS status;
1343         TDB_DATA data;
1344         int32_t cstatus;
1345         bool persistent = (tdb_flags & TDB_CLEAR_IF_FIRST) == 0;
1346
1347         data = string_term_tdb_data(name);
1348
1349         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1350                                persistent
1351                                ? CTDB_CONTROL_DB_ATTACH_PERSISTENT
1352                                : CTDB_CONTROL_DB_ATTACH,
1353                                tdb_flags, 0, data, NULL, &data, &cstatus);
1354         if (!NT_STATUS_IS_OK(status)) {
1355                 DEBUG(0, (__location__ " ctdb_control for db_attach "
1356                           "failed: %s\n", nt_errstr(status)));
1357                 return status;
1358         }
1359
1360         if (cstatus != 0 || data.dsize != sizeof(uint32_t)) {
1361                 DEBUG(0,(__location__ " ctdb_control for db_attach failed\n"));
1362                 return NT_STATUS_INTERNAL_ERROR;
1363         }
1364
1365         *db_id = *(uint32_t *)data.dptr;
1366         talloc_free(data.dptr);
1367
1368         if (!(tdb_flags & TDB_SEQNUM)) {
1369                 return NT_STATUS_OK;
1370         }
1371
1372         data.dptr = (uint8_t *)db_id;
1373         data.dsize = sizeof(*db_id);
1374
1375         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1376                                CTDB_CONTROL_ENABLE_SEQNUM, 0, 0, data,
1377                                NULL, NULL, &cstatus);
1378         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
1379                 DEBUG(0,(__location__ " ctdb_control for enable seqnum "
1380                          "failed\n"));
1381                 return NT_STATUS_IS_OK(status) ? NT_STATUS_INTERNAL_ERROR :
1382                         status;
1383         }
1384
1385         return NT_STATUS_OK;
1386 }
1387
1388 /*
1389  * force the migration of a record to this node
1390  */
1391 NTSTATUS ctdbd_migrate(struct ctdbd_connection *conn, uint32_t db_id,
1392                        TDB_DATA key)
1393 {
1394         struct ctdb_req_call req;
1395         struct ctdb_reply_call *reply;
1396         NTSTATUS status;
1397
1398         ZERO_STRUCT(req);
1399
1400         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
1401         req.hdr.ctdb_magic   = CTDB_MAGIC;
1402         req.hdr.ctdb_version = CTDB_VERSION;
1403         req.hdr.operation    = CTDB_REQ_CALL;
1404         req.hdr.reqid        = ctdbd_next_reqid(conn);
1405         req.flags            = CTDB_IMMEDIATE_MIGRATION;
1406         req.callid           = CTDB_NULL_FUNC;
1407         req.db_id            = db_id;
1408         req.keylen           = key.dsize;
1409
1410         DEBUG(10, ("ctdbd_migrate: Sending ctdb packet\n"));
1411         ctdb_packet_dump(&req.hdr);
1412
1413         status = ctdb_packet_send(
1414                 conn->pkt, 2,
1415                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
1416                 data_blob_const(key.dptr, key.dsize));
1417
1418         if (!NT_STATUS_IS_OK(status)) {
1419                 DEBUG(3, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
1420                 return status;
1421         }
1422
1423         status = ctdb_packet_flush(conn->pkt);
1424
1425         if (!NT_STATUS_IS_OK(status)) {
1426                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
1427                 cluster_fatal("cluster dispatch daemon control write error\n");
1428         }
1429
1430         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
1431
1432         if (!NT_STATUS_IS_OK(status)) {
1433                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1434                 goto fail;
1435         }
1436
1437         if (reply->hdr.operation != CTDB_REPLY_CALL) {
1438                 DEBUG(0, ("received invalid reply\n"));
1439                 status = NT_STATUS_INTERNAL_ERROR;
1440                 goto fail;
1441         }
1442
1443         status = NT_STATUS_OK;
1444  fail:
1445
1446         TALLOC_FREE(reply);
1447         return status;
1448 }
1449
1450 /*
1451  * Fetch a record and parse it
1452  */
1453 NTSTATUS ctdbd_parse(struct ctdbd_connection *conn, uint32_t db_id,
1454                      TDB_DATA key, bool local_copy,
1455                      void (*parser)(TDB_DATA key, TDB_DATA data,
1456                                     void *private_data),
1457                      void *private_data)
1458 {
1459         struct ctdb_req_call req;
1460         struct ctdb_reply_call *reply;
1461         NTSTATUS status;
1462         uint32_t flags;
1463
1464 #ifdef HAVE_CTDB_WANT_READONLY_DECL
1465         flags = local_copy ? CTDB_WANT_READONLY : 0;
1466 #else
1467         flags = 0;
1468 #endif
1469
1470         ZERO_STRUCT(req);
1471
1472         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
1473         req.hdr.ctdb_magic   = CTDB_MAGIC;
1474         req.hdr.ctdb_version = CTDB_VERSION;
1475         req.hdr.operation    = CTDB_REQ_CALL;
1476         req.hdr.reqid        = ctdbd_next_reqid(conn);
1477         req.flags            = flags;
1478         req.callid           = CTDB_FETCH_FUNC;
1479         req.db_id            = db_id;
1480         req.keylen           = key.dsize;
1481
1482         status = ctdb_packet_send(
1483                 conn->pkt, 2,
1484                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
1485                 data_blob_const(key.dptr, key.dsize));
1486
1487         if (!NT_STATUS_IS_OK(status)) {
1488                 DEBUG(3, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
1489                 return status;
1490         }
1491
1492         status = ctdb_packet_flush(conn->pkt);
1493
1494         if (!NT_STATUS_IS_OK(status)) {
1495                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
1496                 cluster_fatal("cluster dispatch daemon control write error\n");
1497         }
1498
1499         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
1500
1501         if (!NT_STATUS_IS_OK(status)) {
1502                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1503                 goto fail;
1504         }
1505
1506         if (reply->hdr.operation != CTDB_REPLY_CALL) {
1507                 DEBUG(0, ("received invalid reply\n"));
1508                 status = NT_STATUS_INTERNAL_ERROR;
1509                 goto fail;
1510         }
1511
1512         if (reply->datalen == 0) {
1513                 /*
1514                  * Treat an empty record as non-existing
1515                  */
1516                 status = NT_STATUS_NOT_FOUND;
1517                 goto fail;
1518         }
1519
1520         parser(key, make_tdb_data(&reply->data[0], reply->datalen),
1521                private_data);
1522
1523         status = NT_STATUS_OK;
1524  fail:
1525         TALLOC_FREE(reply);
1526         return status;
1527 }
1528
1529 struct ctdbd_traverse_state {
1530         void (*fn)(TDB_DATA key, TDB_DATA data, void *private_data);
1531         void *private_data;
1532 };
1533
1534 /*
1535  * Handle a traverse record coming in on the ctdbd connection
1536  */
1537
1538 static NTSTATUS ctdb_traverse_handler(uint8_t *buf, size_t length,
1539                                       void *private_data)
1540 {
1541         struct ctdbd_traverse_state *state =
1542                 (struct ctdbd_traverse_state *)private_data;
1543
1544         struct ctdb_req_message *m;
1545         struct ctdb_rec_data *d;
1546         TDB_DATA key, data;
1547
1548         m = (struct ctdb_req_message *)buf;
1549
1550         if (length < sizeof(*m) || m->hdr.length != length) {
1551                 DEBUG(0, ("Got invalid message of length %d\n", (int)length));
1552                 TALLOC_FREE(buf);
1553                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1554         }
1555
1556         d = (struct ctdb_rec_data *)&m->data[0];
1557         if (m->datalen < sizeof(uint32_t) || m->datalen != d->length) {
1558                 DEBUG(0, ("Got invalid traverse data of length %d\n",
1559                           (int)m->datalen));
1560                 TALLOC_FREE(buf);
1561                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1562         }
1563
1564         key.dsize = d->keylen;
1565         key.dptr  = &d->data[0];
1566         data.dsize = d->datalen;
1567         data.dptr = &d->data[d->keylen];
1568
1569         if (key.dsize == 0 && data.dsize == 0) {
1570                 /* end of traverse */
1571                 return NT_STATUS_END_OF_FILE;
1572         }
1573
1574         if (data.dsize < sizeof(struct ctdb_ltdb_header)) {
1575                 DEBUG(0, ("Got invalid ltdb header length %d\n",
1576                           (int)data.dsize));
1577                 TALLOC_FREE(buf);
1578                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1579         }
1580         data.dsize -= sizeof(struct ctdb_ltdb_header);
1581         data.dptr += sizeof(struct ctdb_ltdb_header);
1582
1583         if (state->fn) {
1584                 state->fn(key, data, state->private_data);
1585         }
1586
1587         TALLOC_FREE(buf);
1588         return NT_STATUS_OK;
1589 }
1590
1591 /*
1592   Traverse a ctdb database. This uses a kind-of hackish way to open a second
1593   connection to ctdbd to avoid the hairy recursive and async problems with
1594   everything in-line.
1595 */
1596
1597 NTSTATUS ctdbd_traverse(uint32_t db_id,
1598                         void (*fn)(TDB_DATA key, TDB_DATA data,
1599                                    void *private_data),
1600                         void *private_data)
1601 {
1602         struct ctdbd_connection *conn;
1603         NTSTATUS status;
1604
1605         TDB_DATA data;
1606         struct ctdb_traverse_start t;
1607         int cstatus;
1608         struct ctdbd_traverse_state state;
1609
1610         become_root();
1611         status = ctdbd_init_connection(NULL, &conn);
1612         unbecome_root();
1613         if (!NT_STATUS_IS_OK(status)) {
1614                 DEBUG(0, ("ctdbd_init_connection failed: %s\n",
1615                           nt_errstr(status)));
1616                 return status;
1617         }
1618
1619         t.db_id = db_id;
1620         t.srvid = conn->rand_srvid;
1621         t.reqid = ctdbd_next_reqid(conn);
1622
1623         data.dptr = (uint8_t *)&t;
1624         data.dsize = sizeof(t);
1625
1626         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1627                                CTDB_CONTROL_TRAVERSE_START, conn->rand_srvid, 0,
1628                                data, NULL, NULL, &cstatus);
1629
1630         if (!NT_STATUS_IS_OK(status) || (cstatus != 0)) {
1631
1632                 DEBUG(0,("ctdbd_control failed: %s, %d\n", nt_errstr(status),
1633                          cstatus));
1634
1635                 if (NT_STATUS_IS_OK(status)) {
1636                         /*
1637                          * We need a mapping here
1638                          */
1639                         status = NT_STATUS_UNSUCCESSFUL;
1640                 }
1641                 goto done;
1642         }
1643
1644         state.fn = fn;
1645         state.private_data = private_data;
1646
1647         while (True) {
1648
1649                 status = NT_STATUS_OK;
1650
1651                 if (ctdb_packet_handler(conn->pkt, ctdb_req_complete,
1652                                    ctdb_traverse_handler, &state, &status)) {
1653
1654                         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1655                                 status = NT_STATUS_OK;
1656                                 break;
1657                         }
1658
1659                         /*
1660                          * There might be more in the queue
1661                          */
1662                         continue;
1663                 }
1664
1665                 if (!NT_STATUS_IS_OK(status)) {
1666                         break;
1667                 }
1668
1669                 status = ctdb_packet_fd_read_sync(conn->pkt);
1670
1671                 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1672                         /*
1673                          * There might be more in the queue
1674                          */
1675                         continue;
1676                 }
1677
1678                 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1679                         status = NT_STATUS_OK;
1680                         break;
1681                 }
1682
1683                 if (!NT_STATUS_IS_OK(status)) {
1684                         DEBUG(0, ("ctdb_packet_fd_read_sync failed: %s\n", nt_errstr(status)));
1685                         cluster_fatal("ctdbd died\n");
1686                 }
1687         }
1688
1689  done:
1690         TALLOC_FREE(conn);
1691         return status;
1692 }
1693
1694 /*
1695    This is used to canonicalize a ctdb_sock_addr structure.
1696 */
1697 static void smbd_ctdb_canonicalize_ip(const struct sockaddr_storage *in,
1698                                       struct sockaddr_storage *out)
1699 {
1700         memcpy(out, in, sizeof (*out));
1701
1702 #ifdef HAVE_IPV6
1703         if (in->ss_family == AF_INET6) {
1704                 const char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
1705                 const struct sockaddr_in6 *in6 =
1706                         (const struct sockaddr_in6 *)in;
1707                 struct sockaddr_in *out4 = (struct sockaddr_in *)out;
1708                 if (memcmp(&in6->sin6_addr, prefix, 12) == 0) {
1709                         memset(out, 0, sizeof(*out));
1710 #ifdef HAVE_SOCK_SIN_LEN
1711                         out4->sin_len = sizeof(*out);
1712 #endif
1713                         out4->sin_family = AF_INET;
1714                         out4->sin_port   = in6->sin6_port;
1715                         memcpy(&out4->sin_addr, &in6->sin6_addr.s6_addr[12], 4);
1716                 }
1717         }
1718 #endif
1719 }
1720
1721 /*
1722  * Register us as a server for a particular tcp connection
1723  */
1724
1725 NTSTATUS ctdbd_register_ips(struct ctdbd_connection *conn,
1726                             const struct sockaddr_storage *_server,
1727                             const struct sockaddr_storage *_client,
1728                             bool (*release_ip_handler)(const char *ip_addr,
1729                                                        void *private_data),
1730                             void *private_data)
1731 {
1732         /*
1733          * we still use ctdb_control_tcp for ipv4
1734          * because we want to work against older ctdb
1735          * versions at runtime
1736          */
1737         struct ctdb_control_tcp p4;
1738 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1739         struct ctdb_control_tcp_addr p;
1740 #endif
1741         TDB_DATA data;
1742         NTSTATUS status;
1743         struct sockaddr_storage client;
1744         struct sockaddr_storage server;
1745
1746         /*
1747          * Only one connection so far
1748          */
1749         SMB_ASSERT(conn->release_ip_handler == NULL);
1750
1751         smbd_ctdb_canonicalize_ip(_client, &client);
1752         smbd_ctdb_canonicalize_ip(_server, &server);
1753
1754         switch (client.ss_family) {
1755         case AF_INET:
1756                 memcpy(&p4.dest, &server, sizeof(p4.dest));
1757                 memcpy(&p4.src, &client, sizeof(p4.src));
1758                 data.dptr = (uint8_t *)&p4;
1759                 data.dsize = sizeof(p4);
1760                 break;
1761 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1762         case AF_INET6:
1763                 memcpy(&p.dest.ip6, &server, sizeof(p.dest.ip6));
1764                 memcpy(&p.src.ip6, &client, sizeof(p.src.ip6));
1765                 data.dptr = (uint8_t *)&p;
1766                 data.dsize = sizeof(p);
1767                 break;
1768 #endif
1769         default:
1770                 return NT_STATUS_INTERNAL_ERROR;
1771         }
1772
1773         conn->release_ip_handler = release_ip_handler;
1774         conn->release_ip_priv = private_data;
1775
1776         /*
1777          * We want to be told about IP releases
1778          */
1779
1780         status = register_with_ctdbd(conn, CTDB_SRVID_RELEASE_IP);
1781         if (!NT_STATUS_IS_OK(status)) {
1782                 return status;
1783         }
1784
1785         /*
1786          * inform ctdb of our tcp connection, so if IP takeover happens ctdb
1787          * can send an extra ack to trigger a reset for our client, so it
1788          * immediately reconnects
1789          */
1790         return ctdbd_control(conn, CTDB_CURRENT_NODE,
1791                              CTDB_CONTROL_TCP_CLIENT, 0,
1792                              CTDB_CTRL_FLAG_NOREPLY, data, NULL, NULL, NULL);
1793 }
1794
1795 /*
1796  * We want to handle reconfigure events
1797  */
1798 NTSTATUS ctdbd_register_reconfigure(struct ctdbd_connection *conn)
1799 {
1800         return register_with_ctdbd(conn, CTDB_SRVID_RECONFIGURE);
1801 }
1802
1803 /*
1804   call a control on the local node
1805  */
1806 NTSTATUS ctdbd_control_local(struct ctdbd_connection *conn, uint32_t opcode,
1807                              uint64_t srvid, uint32_t flags, TDB_DATA data,
1808                              TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
1809                              int *cstatus)
1810 {
1811         return ctdbd_control(conn, CTDB_CURRENT_NODE, opcode, srvid, flags, data, mem_ctx, outdata, cstatus);
1812 }
1813
1814 NTSTATUS ctdb_watch_us(struct ctdbd_connection *conn)
1815 {
1816         struct ctdb_client_notify_register reg_data;
1817         size_t struct_len;
1818         NTSTATUS status;
1819         int cstatus;
1820
1821         reg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1822         reg_data.len = 1;
1823         reg_data.notify_data[0] = 0;
1824
1825         struct_len = offsetof(struct ctdb_client_notify_register,
1826                               notify_data) + reg_data.len;
1827
1828         status = ctdbd_control_local(
1829                 conn, CTDB_CONTROL_REGISTER_NOTIFY, conn->rand_srvid, 0,
1830                 make_tdb_data((uint8_t *)&reg_data, struct_len),
1831                 NULL, NULL, &cstatus);
1832         if (!NT_STATUS_IS_OK(status)) {
1833                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1834                           nt_errstr(status)));
1835         }
1836         return status;
1837 }
1838
1839 NTSTATUS ctdb_unwatch(struct ctdbd_connection *conn)
1840 {
1841         struct ctdb_client_notify_deregister dereg_data;
1842         NTSTATUS status;
1843         int cstatus;
1844
1845         dereg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1846
1847         status = ctdbd_control_local(
1848                 conn, CTDB_CONTROL_DEREGISTER_NOTIFY, conn->rand_srvid, 0,
1849                 make_tdb_data((uint8_t *)&dereg_data, sizeof(dereg_data)),
1850                 NULL, NULL, &cstatus);
1851         if (!NT_STATUS_IS_OK(status)) {
1852                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1853                           nt_errstr(status)));
1854         }
1855         return status;
1856 }
1857
1858 NTSTATUS ctdbd_probe(void)
1859 {
1860         /*
1861          * Do a very early check if ctdbd is around to avoid an abort and core
1862          * later
1863          */
1864         struct ctdbd_connection *conn = NULL;
1865         NTSTATUS status;
1866
1867         status = ctdbd_messaging_connection(talloc_tos(), &conn);
1868
1869         /*
1870          * We only care if we can connect.
1871          */
1872         TALLOC_FREE(conn);
1873
1874         return status;
1875 }
1876
1877 #else
1878
1879 NTSTATUS ctdbd_probe(void)
1880 {
1881         return NT_STATUS_OK;
1882 }
1883
1884 NTSTATUS ctdbd_messaging_send_blob(struct ctdbd_connection *conn,
1885                                    uint32_t dst_vnn, uint64_t dst_srvid,
1886                                    const uint8_t *buf, size_t buflen)
1887 {
1888         return NT_STATUS_NOT_IMPLEMENTED;
1889 }
1890
1891 #endif