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
  24 #ifdef CLUSTER_SUPPORT
  25
  26 #include "ctdbd_conn.h"
  27 #include "ctdb_packet.h"
  28 #include "messages.h"
  29
  30 /*
  31  * It is not possible to include ctdb.h and tdb_compat.h (included via
  32  * some other include above) without warnings. This fixes those
  33  * warnings.
  34  */
  35
  36 #ifdef typesafe_cb
  37 #undef typesafe_cb
  38 #endif
  39
  40 #ifdef typesafe_cb_preargs
  41 #undef typesafe_cb_preargs
  42 #endif
  43
  44 #ifdef typesafe_cb_postargs
  45 #undef typesafe_cb_postargs
  46 #endif
  47
  48 /* paths to these include files come from --with-ctdb= in configure */
  49
  50 #include "ctdb.h"
  51 #include "ctdb_private.h"
  52
  53 struct ctdbd_connection {
  54         struct messaging_context *msg_ctx;
  55         uint32 reqid;
  56         uint32 our_vnn;
  57         uint64 rand_srvid;
  58         struct ctdb_packet_context *pkt;
  59         struct fd_event *fde;
  60
  61         void (*release_ip_handler)(const char *ip_addr, void *private_data);
  62         void *release_ip_priv;
  63 };
  64
  65 static uint32_t ctdbd_next_reqid(struct ctdbd_connection *conn)
  66 {
  67         conn->reqid += 1;
  68         if (conn->reqid == 0) {
  69                 conn->reqid += 1;
  70         }
  71         return conn->reqid;
  72 }
  73
  74 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
  75                               uint32_t vnn, uint32 opcode,
  76                               uint64_t srvid, uint32_t flags, TDB_DATA data,
  77                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
  78                               int *cstatus);
  79
  80 /*
  81  * exit on fatal communications errors with the ctdbd daemon
  82  */
  83 static void cluster_fatal(const char *why)
  84 {
  85         DEBUG(0,("cluster fatal event: %s - exiting immediately\n", why));
  86         /* we don't use smb_panic() as we don't want to delay to write
  87            a core file. We need to release this process id immediately
  88            so that someone else can take over without getting sharing
  89            violations */
  90         _exit(1);
  91 }
  92
  93 /*
  94  *
  95  */
  96 static void ctdb_packet_dump(struct ctdb_req_header *hdr)
  97 {
  98         if (DEBUGLEVEL < 10) {
  99                 return;
 100         }
 101         DEBUGADD(10, ("len=%d, magic=%x, vers=%d, gen=%d, op=%d, reqid=%d\n",
 102                       (int)hdr->length, (int)hdr->ctdb_magic,
 103                       (int)hdr->ctdb_version, (int)hdr->generation,
 104                       (int)hdr->operation, (int)hdr->reqid));
 105 }
 106
 107 /*
 108  * Register a srvid with ctdbd
 109  */
 110 static NTSTATUS register_with_ctdbd(struct ctdbd_connection *conn,
 111                                     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 *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                 cluster_fatal("ctdbd_control failed\n");
 132         }
 133         *vnn = (uint32_t)cstatus;
 134         return status;
 135 }
 136
 137 /*
 138  * Are we active (i.e. not banned or stopped?)
 139  */
 140 static bool ctdbd_working(struct ctdbd_connection *conn, uint32_t vnn)
 141 {
 142         int32_t cstatus=-1;
 143         NTSTATUS status;
 144         TDB_DATA outdata;
 145         struct ctdb_node_map *m;
 146         uint32_t failure_flags;
 147         bool ret = false;
 148         int i;
 149
 150         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 151                                CTDB_CONTROL_GET_NODEMAP, 0, 0,
 152                                tdb_null, talloc_tos(), &outdata, &cstatus);
 153         if (!NT_STATUS_IS_OK(status)) {
 154                 cluster_fatal("ctdbd_control failed\n");
 155         }
 156         if ((cstatus != 0) || (outdata.dptr == NULL)) {
 157                 DEBUG(2, ("Received invalid ctdb data\n"));
 158                 return false;
 159         }
 160
 161         m = (struct ctdb_node_map *)outdata.dptr;
 162
 163         for (i=0; i<m->num; i++) {
 164                 if (vnn == m->nodes[i].pnn) {
 165                         break;
 166                 }
 167         }
 168
 169         if (i == m->num) {
 170                 DEBUG(2, ("Did not find ourselves (node %d) in nodemap\n",
 171                           (int)vnn));
 172                 goto fail;
 173         }
 174
 175         failure_flags = NODE_FLAGS_BANNED | NODE_FLAGS_DISCONNECTED
 176                 | NODE_FLAGS_PERMANENTLY_DISABLED | NODE_FLAGS_STOPPED;
 177
 178         if ((m->nodes[i].flags & failure_flags) != 0) {
 179                 DEBUG(2, ("Node has status %x, not active\n",
 180                           (int)m->nodes[i].flags));
 181                 goto fail;
 182         }
 183
 184         ret = true;
 185 fail:
 186         TALLOC_FREE(outdata.dptr);
 187         return ret;
 188 }
 189
 190 uint32 ctdbd_vnn(const struct ctdbd_connection *conn)
 191 {
 192         return conn->our_vnn;
 193 }
 194
 195 /*
 196  * Get us a ctdb connection
 197  */
 198
 199 static NTSTATUS ctdbd_connect(TALLOC_CTX *mem_ctx,
 200                               struct ctdb_packet_context **presult)
 201 {
 202         struct ctdb_packet_context *result;
 203         const char *sockname = lp_ctdbd_socket();
 204         struct sockaddr_un addr;
 205         int fd;
 206
 207         if (!sockname || !*sockname) {
 208                 sockname = CTDB_PATH;
 209         }
 210
 211         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 212         if (fd == -1) {
 213                 DEBUG(3, ("Could not create socket: %s\n", strerror(errno)));
 214                 return map_nt_error_from_unix(errno);
 215         }
 216
 217         ZERO_STRUCT(addr);
 218         addr.sun_family = AF_UNIX;
 219         strncpy(addr.sun_path, sockname, sizeof(addr.sun_path));
 220
 221         if (sys_connect(fd, (struct sockaddr *)(void *)&addr) == -1) {
 222                 DEBUG(1, ("connect(%s) failed: %s\n", sockname,
 223                           strerror(errno)));
 224                 close(fd);
 225                 return map_nt_error_from_unix(errno);
 226         }
 227
 228         if (!(result = ctdb_packet_init(mem_ctx, fd))) {
 229                 close(fd);
 230                 return NT_STATUS_NO_MEMORY;
 231         }
 232
 233         *presult = result;
 234         return NT_STATUS_OK;
 235 }
 236
 237 /*
 238  * Do we have a complete ctdb packet in the queue?
 239  */
 240
 241 static bool ctdb_req_complete(const uint8_t *buf, size_t available,
 242                               size_t *length,
 243                               void *private_data)
 244 {
 245         uint32 msglen;
 246
 247         if (available < sizeof(msglen)) {
 248                 return False;
 249         }
 250
 251         msglen = *((uint32 *)buf);
 252
 253         DEBUG(10, ("msglen = %d\n", msglen));
 254
 255         if (msglen < sizeof(struct ctdb_req_header)) {
 256                 DEBUG(0, ("Got invalid msglen: %d, expected at least %d for "
 257                           "the req_header\n", (int)msglen,
 258                           (int)sizeof(struct ctdb_req_header)));
 259                 cluster_fatal("ctdbd protocol error\n");
 260         }
 261
 262         if (available < msglen) {
 263                 return false;
 264         }
 265
 266         *length = msglen;
 267         return true;
 268 }
 269
 270 /*
 271  * State necessary to defer an incoming message while we are waiting for a
 272  * ctdb reply.
 273  */
 274
 275 struct deferred_msg_state {
 276         struct messaging_context *msg_ctx;
 277         struct messaging_rec *rec;
 278 };
 279
 280 /*
 281  * Timed event handler for the deferred message
 282  */
 283
 284 static void deferred_message_dispatch(struct event_context *event_ctx,
 285                                       struct timed_event *te,
 286                                       struct timeval now,
 287                                       void *private_data)
 288 {
 289         struct deferred_msg_state *state = talloc_get_type_abort(
 290                 private_data, struct deferred_msg_state);
 291
 292         messaging_dispatch_rec(state->msg_ctx, state->rec);
 293         TALLOC_FREE(state);
 294         TALLOC_FREE(te);
 295 }
 296
 297 struct req_pull_state {
 298         TALLOC_CTX *mem_ctx;
 299         DATA_BLOB req;
 300 };
 301
 302 /*
 303  * Pull a ctdb request out of the incoming ctdb_packet queue
 304  */
 305
 306 static NTSTATUS ctdb_req_pull(uint8_t *buf, size_t length,
 307                               void *private_data)
 308 {
 309         struct req_pull_state *state = (struct req_pull_state *)private_data;
 310
 311         state->req.data = talloc_move(state->mem_ctx, &buf);
 312         state->req.length = length;
 313         return NT_STATUS_OK;
 314 }
 315
 316 /*
 317  * Fetch a messaging_rec from an incoming ctdb style message
 318  */
 319
 320 static struct messaging_rec *ctdb_pull_messaging_rec(TALLOC_CTX *mem_ctx,
 321                                                      size_t overall_length,
 322                                                      struct ctdb_req_message *msg)
 323 {
 324         struct messaging_rec *result;
 325         DATA_BLOB blob;
 326         enum ndr_err_code ndr_err;
 327
 328         if ((overall_length < offsetof(struct ctdb_req_message, data))
 329             || (overall_length
 330                 < offsetof(struct ctdb_req_message, data) + msg->datalen)) {
 331
 332                 cluster_fatal("got invalid msg length");
 333         }
 334
 335         if (!(result = talloc(mem_ctx, struct messaging_rec))) {
 336                 DEBUG(0, ("talloc failed\n"));
 337                 return NULL;
 338         }
 339
 340         blob = data_blob_const(msg->data, msg->datalen);
 341
 342         ndr_err = ndr_pull_struct_blob(
 343                 &blob, result, result,
 344                 (ndr_pull_flags_fn_t)ndr_pull_messaging_rec);
 345
 346         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 347                 DEBUG(0, ("ndr_pull_struct_blob failed: %s\n",
 348                           ndr_errstr(ndr_err)));
 349                 TALLOC_FREE(result);
 350                 return NULL;
 351         }
 352
 353         if (DEBUGLEVEL >= 10) {
 354                 DEBUG(10, ("ctdb_pull_messaging_rec:\n"));
 355                 NDR_PRINT_DEBUG(messaging_rec, result);
 356         }
 357
 358         return result;
 359 }
 360
 361 static NTSTATUS ctdb_packet_fd_read_sync(struct ctdb_packet_context *ctx)
 362 {
 363         int timeout = lp_ctdb_timeout();
 364
 365         if (timeout == 0) {
 366                 timeout = -1;
 367         }
 368         return ctdb_packet_fd_read_sync_timeout(ctx, timeout);
 369 }
 370
 371 /*
 372  * Read a full ctdbd request. If we have a messaging context, defer incoming
 373  * messages that might come in between.
 374  */
 375
 376 static NTSTATUS ctdb_read_req(struct ctdbd_connection *conn, uint32 reqid,
 377                               TALLOC_CTX *mem_ctx, void *result)
 378 {
 379         struct ctdb_req_header *hdr;
 380         struct req_pull_state state;
 381         NTSTATUS status;
 382
 383  next_pkt:
 384         ZERO_STRUCT(state);
 385         state.mem_ctx = mem_ctx;
 386
 387         while (!ctdb_packet_handler(conn->pkt, ctdb_req_complete,
 388                                     ctdb_req_pull, &state, &status)) {
 389                 /*
 390                  * Not enough data
 391                  */
 392                 status = ctdb_packet_fd_read_sync(conn->pkt);
 393
 394                 if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_BUSY)) {
 395                         /* EAGAIN */
 396                         continue;
 397                 } else if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 398                         /* EAGAIN */
 399                         continue;
 400                 }
 401
 402                 if (!NT_STATUS_IS_OK(status)) {
 403                         DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
 404                         cluster_fatal("ctdbd died\n");
 405                 }
 406         }
 407
 408         if (!NT_STATUS_IS_OK(status)) {
 409                 DEBUG(0, ("Could not read ctdb_packet: %s\n", nt_errstr(status)));
 410                 cluster_fatal("ctdbd died\n");
 411         }
 412
 413         hdr = (struct ctdb_req_header *)state.req.data;
 414
 415         DEBUG(10, ("Received ctdb packet\n"));
 416         ctdb_packet_dump(hdr);
 417
 418         if (hdr->operation == CTDB_REQ_MESSAGE) {
 419                 struct timed_event *evt;
 420                 struct deferred_msg_state *msg_state;
 421                 struct ctdb_req_message *msg = (struct ctdb_req_message *)hdr;
 422
 423                 if (conn->msg_ctx == NULL) {
 424                         DEBUG(1, ("Got a message without having a msg ctx, "
 425                                   "dropping msg %llu\n",
 426                                   (long long unsigned)msg->srvid));
 427                         goto next_pkt;
 428                 }
 429
 430                 if ((conn->release_ip_handler != NULL)
 431                     && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 432                         /* must be dispatched immediately */
 433                         DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 434                         conn->release_ip_handler((const char *)msg->data,
 435                                                  conn->release_ip_priv);
 436                         TALLOC_FREE(hdr);
 437                         goto next_pkt;
 438                 }
 439
 440                 if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 441                     || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)) {
 442
 443                         DEBUG(1, ("ctdb_read_req: Got %s message\n",
 444                                   (msg->srvid == CTDB_SRVID_RECONFIGURE)
 445                                   ? "cluster reconfigure" : "SAMBA_NOTIFY"));
 446
 447                         messaging_send(conn->msg_ctx,
 448                                        messaging_server_id(conn->msg_ctx),
 449                                        MSG_SMB_BRL_VALIDATE, &data_blob_null);
 450                         messaging_send(conn->msg_ctx,
 451                                        messaging_server_id(conn->msg_ctx),
 452                                        MSG_DBWRAP_G_LOCK_RETRY,
 453                                        &data_blob_null);
 454                         TALLOC_FREE(hdr);
 455                         goto next_pkt;
 456                 }
 457
 458                 msg_state = talloc(NULL, struct deferred_msg_state);
 459                 if (msg_state == NULL) {
 460                         DEBUG(0, ("talloc failed\n"));
 461                         TALLOC_FREE(hdr);
 462                         goto next_pkt;
 463                 }
 464
 465                 if (!(msg_state->rec = ctdb_pull_messaging_rec(
 466                               msg_state, state.req.length, msg))) {
 467                         DEBUG(0, ("ctdbd_pull_messaging_rec failed\n"));
 468                         TALLOC_FREE(msg_state);
 469                         TALLOC_FREE(hdr);
 470                         goto next_pkt;
 471                 }
 472
 473                 TALLOC_FREE(hdr);
 474
 475                 msg_state->msg_ctx = conn->msg_ctx;
 476
 477                 /*
 478                  * We're waiting for a call reply, but an async message has
 479                  * crossed. Defer dispatching to the toplevel event loop.
 480                  */
 481                 evt = event_add_timed(conn->msg_ctx->event_ctx,
 482                                       conn->msg_ctx->event_ctx,
 483                                       timeval_zero(),
 484                                       deferred_message_dispatch,
 485                                       msg_state);
 486                 if (evt == NULL) {
 487                         DEBUG(0, ("event_add_timed failed\n"));
 488                         TALLOC_FREE(msg_state);
 489                         TALLOC_FREE(hdr);
 490                         goto next_pkt;
 491                 }
 492
 493                 goto next_pkt;
 494         }
 495
 496         if ((reqid != 0) && (hdr->reqid != reqid)) {
 497                 /* we got the wrong reply */
 498                 DEBUG(0,("Discarding mismatched ctdb reqid %u should have "
 499                          "been %u\n", hdr->reqid, reqid));
 500                 TALLOC_FREE(hdr);
 501                 goto next_pkt;
 502         }
 503
 504         *((void **)result) = talloc_move(mem_ctx, &hdr);
 505
 506         return NT_STATUS_OK;
 507 }
 508
 509 /*
 510  * Get us a ctdbd connection
 511  */
 512
 513 static NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
 514                                       struct ctdbd_connection **pconn)
 515 {
 516         struct ctdbd_connection *conn;
 517         NTSTATUS status;
 518
 519         if (!(conn = talloc_zero(mem_ctx, struct ctdbd_connection))) {
 520                 DEBUG(0, ("talloc failed\n"));
 521                 return NT_STATUS_NO_MEMORY;
 522         }
 523
 524         status = ctdbd_connect(conn, &conn->pkt);
 525
 526         if (!NT_STATUS_IS_OK(status)) {
 527                 DEBUG(10, ("ctdbd_connect failed: %s\n", nt_errstr(status)));
 528                 goto fail;
 529         }
 530
 531         status = get_cluster_vnn(conn, &conn->our_vnn);
 532
 533         if (!NT_STATUS_IS_OK(status)) {
 534                 DEBUG(10, ("get_cluster_vnn failed: %s\n", nt_errstr(status)));
 535                 goto fail;
 536         }
 537
 538         if (!ctdbd_working(conn, conn->our_vnn)) {
 539                 DEBUG(2, ("Node is not working, can not connect\n"));
 540                 status = NT_STATUS_INTERNAL_DB_ERROR;
 541                 goto fail;
 542         }
 543
 544         generate_random_buffer((unsigned char *)&conn->rand_srvid,
 545                                sizeof(conn->rand_srvid));
 546
 547         status = register_with_ctdbd(conn, conn->rand_srvid);
 548
 549         if (!NT_STATUS_IS_OK(status)) {
 550                 DEBUG(5, ("Could not register random srvid: %s\n",
 551                           nt_errstr(status)));
 552                 goto fail;
 553         }
 554
 555         *pconn = conn;
 556         return NT_STATUS_OK;
 557
 558  fail:
 559         TALLOC_FREE(conn);
 560         return status;
 561 }
 562
 563 /*
 564  * Get us a ctdbd connection and register us as a process
 565  */
 566
 567 NTSTATUS ctdbd_messaging_connection(TALLOC_CTX *mem_ctx,
 568                                     struct ctdbd_connection **pconn)
 569 {
 570         struct ctdbd_connection *conn;
 571         NTSTATUS status;
 572
 573         status = ctdbd_init_connection(mem_ctx, &conn);
 574
 575         if (!NT_STATUS_IS_OK(status)) {
 576                 return status;
 577         }
 578
 579         status = register_with_ctdbd(conn, (uint64_t)sys_getpid());
 580         if (!NT_STATUS_IS_OK(status)) {
 581                 goto fail;
 582         }
 583
 584         status = register_with_ctdbd(conn, MSG_SRVID_SAMBA);
 585         if (!NT_STATUS_IS_OK(status)) {
 586                 goto fail;
 587         }
 588
 589         status = register_with_ctdbd(conn, CTDB_SRVID_SAMBA_NOTIFY);
 590         if (!NT_STATUS_IS_OK(status)) {
 591                 goto fail;
 592         }
 593
 594         *pconn = conn;
 595         return NT_STATUS_OK;
 596
 597  fail:
 598         TALLOC_FREE(conn);
 599         return status;
 600 }
 601
 602 struct messaging_context *ctdb_conn_msg_ctx(struct ctdbd_connection *conn)
 603 {
 604         return conn->msg_ctx;
 605 }
 606
 607 int ctdbd_conn_get_fd(struct ctdbd_connection *conn)
 608 {
 609         return ctdb_packet_get_fd(conn->pkt);
 610 }
 611
 612 /*
 613  * Packet handler to receive and handle a ctdb message
 614  */
 615 static NTSTATUS ctdb_handle_message(uint8_t *buf, size_t length,
 616                                     void *private_data)
 617 {
 618         struct ctdbd_connection *conn = talloc_get_type_abort(
 619                 private_data, struct ctdbd_connection);
 620         struct ctdb_req_message *msg;
 621         struct messaging_rec *msg_rec;
 622
 623         msg = (struct ctdb_req_message *)buf;
 624
 625         if (msg->hdr.operation != CTDB_REQ_MESSAGE) {
 626                 DEBUG(0, ("Received async msg of type %u, discarding\n",
 627                           msg->hdr.operation));
 628                 TALLOC_FREE(buf);
 629                 return NT_STATUS_INVALID_PARAMETER;
 630         }
 631
 632         if ((conn->release_ip_handler != NULL)
 633             && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 634                 /* must be dispatched immediately */
 635                 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 636                 conn->release_ip_handler((const char *)msg->data,
 637                                          conn->release_ip_priv);
 638                 TALLOC_FREE(buf);
 639                 return NT_STATUS_OK;
 640         }
 641
 642         SMB_ASSERT(conn->msg_ctx != NULL);
 643
 644         if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 645             || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)){
 646                 DEBUG(0,("Got cluster reconfigure message\n"));
 647                 /*
 648                  * when the cluster is reconfigured or someone of the
 649                  * family has passed away (SAMBA_NOTIFY), we need to
 650                  * clean the brl database
 651                  */
 652                 messaging_send(conn->msg_ctx,
 653                                messaging_server_id(conn->msg_ctx),
 654                                MSG_SMB_BRL_VALIDATE, &data_blob_null);
 655
 656                 messaging_send(conn->msg_ctx,
 657                                messaging_server_id(conn->msg_ctx),
 658                                MSG_DBWRAP_G_LOCK_RETRY,
 659                                &data_blob_null);
 660
 661                 TALLOC_FREE(buf);
 662                 return NT_STATUS_OK;
 663         }
 664
 665         /* only messages to our pid or the broadcast are valid here */
 666         if (msg->srvid != sys_getpid() && msg->srvid != MSG_SRVID_SAMBA) {
 667                 DEBUG(0,("Got unexpected message with srvid=%llu\n",
 668                          (unsigned long long)msg->srvid));
 669                 TALLOC_FREE(buf);
 670                 return NT_STATUS_OK;
 671         }
 672
 673         if (!(msg_rec = ctdb_pull_messaging_rec(NULL, length, msg))) {
 674                 DEBUG(10, ("ctdb_pull_messaging_rec failed\n"));
 675                 TALLOC_FREE(buf);
 676                 return NT_STATUS_NO_MEMORY;
 677         }
 678
 679         messaging_dispatch_rec(conn->msg_ctx, msg_rec);
 680
 681         TALLOC_FREE(msg_rec);
 682         TALLOC_FREE(buf);
 683         return NT_STATUS_OK;
 684 }
 685
 686 /*
 687  * The ctdbd socket is readable asynchronuously
 688  */
 689
 690 static void ctdbd_socket_handler(struct event_context *event_ctx,
 691                                  struct fd_event *event,
 692                                  uint16 flags,
 693                                  void *private_data)
 694 {
 695         struct ctdbd_connection *conn = talloc_get_type_abort(
 696                 private_data, struct ctdbd_connection);
 697
 698         NTSTATUS status;
 699
 700         status = ctdb_packet_fd_read(conn->pkt);
 701
 702         if (!NT_STATUS_IS_OK(status)) {
 703                 DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
 704                 cluster_fatal("ctdbd died\n");
 705         }
 706
 707         while (ctdb_packet_handler(conn->pkt, ctdb_req_complete,
 708                               ctdb_handle_message, conn, &status)) {
 709                 if (!NT_STATUS_IS_OK(status)) {
 710                         DEBUG(10, ("could not handle incoming message: %s\n",
 711                                    nt_errstr(status)));
 712                 }
 713         }
 714 }
 715
 716 /*
 717  * Prepare a ctdbd connection to receive messages
 718  */
 719
 720 NTSTATUS ctdbd_register_msg_ctx(struct ctdbd_connection *conn,
 721                                 struct messaging_context *msg_ctx)
 722 {
 723         SMB_ASSERT(conn->msg_ctx == NULL);
 724         SMB_ASSERT(conn->fde == NULL);
 725
 726         if (!(conn->fde = event_add_fd(msg_ctx->event_ctx, conn,
 727                                        ctdb_packet_get_fd(conn->pkt),
 728                                        EVENT_FD_READ,
 729                                        ctdbd_socket_handler,
 730                                        conn))) {
 731                 DEBUG(0, ("event_add_fd failed\n"));
 732                 return NT_STATUS_NO_MEMORY;
 733         }
 734
 735         conn->msg_ctx = msg_ctx;
 736
 737         return NT_STATUS_OK;
 738 }
 739
 740 /*
 741  * Send a messaging message across a ctdbd
 742  */
 743
 744 NTSTATUS ctdbd_messaging_send(struct ctdbd_connection *conn,
 745                               uint32 dst_vnn, uint64 dst_srvid,
 746                               struct messaging_rec *msg)
 747 {
 748         struct ctdb_req_message r;
 749         TALLOC_CTX *mem_ctx;
 750         DATA_BLOB blob;
 751         NTSTATUS status;
 752         enum ndr_err_code ndr_err;
 753
 754         if (!(mem_ctx = talloc_init("ctdbd_messaging_send"))) {
 755                 DEBUG(0, ("talloc failed\n"));
 756                 return NT_STATUS_NO_MEMORY;
 757         }
 758
 759         ndr_err = ndr_push_struct_blob(
 760                 &blob, mem_ctx, msg,
 761                 (ndr_push_flags_fn_t)ndr_push_messaging_rec);
 762
 763         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 764                 DEBUG(0, ("ndr_push_struct_blob failed: %s\n",
 765                           ndr_errstr(ndr_err)));
 766                 status = ndr_map_error2ntstatus(ndr_err);
 767                 goto fail;
 768         }
 769
 770         r.hdr.length = offsetof(struct ctdb_req_message, data) + blob.length;
 771         r.hdr.ctdb_magic = CTDB_MAGIC;
 772         r.hdr.ctdb_version = CTDB_VERSION;
 773         r.hdr.generation = 1;
 774         r.hdr.operation  = CTDB_REQ_MESSAGE;
 775         r.hdr.destnode   = dst_vnn;
 776         r.hdr.srcnode    = conn->our_vnn;
 777         r.hdr.reqid      = 0;
 778         r.srvid          = dst_srvid;
 779         r.datalen        = blob.length;
 780
 781         DEBUG(10, ("ctdbd_messaging_send: Sending ctdb packet\n"));
 782         ctdb_packet_dump(&r.hdr);
 783
 784         status = ctdb_packet_send(
 785                 conn->pkt, 2,
 786                 data_blob_const(&r, offsetof(struct ctdb_req_message, data)),
 787                 blob);
 788
 789         if (!NT_STATUS_IS_OK(status)) {
 790                 DEBUG(0, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
 791                 goto fail;
 792         }
 793
 794         status = ctdb_packet_flush(conn->pkt);
 795
 796         if (!NT_STATUS_IS_OK(status)) {
 797                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 798                 cluster_fatal("cluster dispatch daemon msg write error\n");
 799         }
 800
 801         status = NT_STATUS_OK;
 802  fail:
 803         TALLOC_FREE(mem_ctx);
 804         return status;
 805 }
 806
 807 /*
 808  * send/recv a generic ctdb control message
 809  */
 810 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
 811                               uint32_t vnn, uint32 opcode,
 812                               uint64_t srvid, uint32_t flags,
 813                               TDB_DATA data,
 814                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
 815                               int *cstatus)
 816 {
 817         struct ctdb_req_control req;
 818         struct ctdb_reply_control *reply = NULL;
 819         struct ctdbd_connection *new_conn = NULL;
 820         NTSTATUS status;
 821
 822         if (conn == NULL) {
 823                 status = ctdbd_init_connection(NULL, &new_conn);
 824
 825                 if (!NT_STATUS_IS_OK(status)) {
 826                         DEBUG(10, ("Could not init temp connection: %s\n",
 827                                    nt_errstr(status)));
 828                         goto fail;
 829                 }
 830
 831                 conn = new_conn;
 832         }
 833
 834         ZERO_STRUCT(req);
 835         req.hdr.length = offsetof(struct ctdb_req_control, data) + data.dsize;
 836         req.hdr.ctdb_magic   = CTDB_MAGIC;
 837         req.hdr.ctdb_version = CTDB_VERSION;
 838         req.hdr.operation    = CTDB_REQ_CONTROL;
 839         req.hdr.reqid        = ctdbd_next_reqid(conn);
 840         req.hdr.destnode     = vnn;
 841         req.opcode           = opcode;
 842         req.srvid            = srvid;
 843         req.datalen          = data.dsize;
 844         req.flags            = flags;
 845
 846         DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
 847         ctdb_packet_dump(&req.hdr);
 848
 849         status = ctdb_packet_send(
 850                 conn->pkt, 2,
 851                 data_blob_const(&req, offsetof(struct ctdb_req_control, data)),
 852                 data_blob_const(data.dptr, data.dsize));
 853
 854         if (!NT_STATUS_IS_OK(status)) {
 855                 DEBUG(3, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
 856                 goto fail;
 857         }
 858
 859         status = ctdb_packet_flush(conn->pkt);
 860
 861         if (!NT_STATUS_IS_OK(status)) {
 862                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 863                 cluster_fatal("cluster dispatch daemon control write error\n");
 864         }
 865
 866         if (flags & CTDB_CTRL_FLAG_NOREPLY) {
 867                 TALLOC_FREE(new_conn);
 868                 if (cstatus) {
 869                         *cstatus = 0;
 870                 }
 871                 return NT_STATUS_OK;
 872         }
 873
 874         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
 875
 876         if (!NT_STATUS_IS_OK(status)) {
 877                 DEBUG(10, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 878                 goto fail;
 879         }
 880
 881         if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
 882                 DEBUG(0, ("received invalid reply\n"));
 883                 goto fail;
 884         }
 885
 886         if (outdata) {
 887                 if (!(outdata->dptr = (uint8 *)talloc_memdup(
 888                               mem_ctx, reply->data, reply->datalen))) {
 889                         TALLOC_FREE(reply);
 890                         return NT_STATUS_NO_MEMORY;
 891                 }
 892                 outdata->dsize = reply->datalen;
 893         }
 894         if (cstatus) {
 895                 (*cstatus) = reply->status;
 896         }
 897
 898         status = NT_STATUS_OK;
 899
 900  fail:
 901         TALLOC_FREE(new_conn);
 902         TALLOC_FREE(reply);
 903         return status;
 904 }
 905
 906 /*
 907  * see if a remote process exists
 908  */
 909 bool ctdbd_process_exists(struct ctdbd_connection *conn, uint32 vnn, pid_t pid)
 910 {
 911         struct server_id id;
 912         bool result;
 913
 914         id.pid = pid;
 915         id.vnn = vnn;
 916
 917         if (!ctdb_processes_exist(conn, &id, 1, &result)) {
 918                 DEBUG(10, ("ctdb_processes_exist failed\n"));
 919                 return false;
 920         }
 921         return result;
 922 }
 923
 924 bool ctdb_processes_exist(struct ctdbd_connection *conn,
 925                           const struct server_id *pids, int num_pids,
 926                           bool *results)
 927 {
 928         TALLOC_CTX *frame = talloc_stackframe();
 929         int i, num_received;
 930         NTSTATUS status;
 931         uint32_t *reqids;
 932         bool result = false;
 933
 934         reqids = talloc_array(talloc_tos(), uint32_t, num_pids);
 935         if (reqids == NULL) {
 936                 goto fail;
 937         }
 938
 939         for (i=0; i<num_pids; i++) {
 940                 struct ctdb_req_control req;
 941                 pid_t pid;
 942
 943                 results[i] = false;
 944                 reqids[i] = ctdbd_next_reqid(conn);
 945
 946                 ZERO_STRUCT(req);
 947
 948                 /*
 949                  * pids[i].pid is uint64_t, scale down to pid_t which
 950                  * is the wire protocol towards ctdb.
 951                  */
 952                 pid = pids[i].pid;
 953
 954                 DEBUG(10, ("Requesting PID %d/%d, reqid=%d\n",
 955                            (int)pids[i].vnn, (int)pid,
 956                            (int)reqids[i]));
 957
 958                 req.hdr.length = offsetof(struct ctdb_req_control, data);
 959                 req.hdr.length += sizeof(pid);
 960                 req.hdr.ctdb_magic   = CTDB_MAGIC;
 961                 req.hdr.ctdb_version = CTDB_VERSION;
 962                 req.hdr.operation    = CTDB_REQ_CONTROL;
 963                 req.hdr.reqid        = reqids[i];
 964                 req.hdr.destnode     = pids[i].vnn;
 965                 req.opcode           = CTDB_CONTROL_PROCESS_EXISTS;
 966                 req.srvid            = 0;
 967                 req.datalen          = sizeof(pid);
 968                 req.flags            = 0;
 969
 970                 DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
 971                 ctdb_packet_dump(&req.hdr);
 972
 973                 status = ctdb_packet_send(
 974                         conn->pkt, 2,
 975                         data_blob_const(
 976                                 &req, offsetof(struct ctdb_req_control, data)),
 977                         data_blob_const(&pid, sizeof(pid)));
 978                 if (!NT_STATUS_IS_OK(status)) {
 979                         DEBUG(10, ("ctdb_packet_send failed: %s\n",
 980                                    nt_errstr(status)));
 981                         goto fail;
 982                 }
 983         }
 984
 985         status = ctdb_packet_flush(conn->pkt);
 986         if (!NT_STATUS_IS_OK(status)) {
 987                 DEBUG(10, ("ctdb_packet_flush failed: %s\n",
 988                            nt_errstr(status)));
 989                 goto fail;
 990         }
 991
 992         num_received = 0;
 993
 994         while (num_received < num_pids) {
 995                 struct ctdb_reply_control *reply = NULL;
 996                 uint32_t reqid;
 997
 998                 status = ctdb_read_req(conn, 0, talloc_tos(), (void *)&reply);
 999                 if (!NT_STATUS_IS_OK(status)) {
1000                         DEBUG(10, ("ctdb_read_req failed: %s\n",
1001                                    nt_errstr(status)));
1002                         goto fail;
1003                 }
1004
1005                 if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
1006                         DEBUG(10, ("Received invalid reply\n"));
1007                         goto fail;
1008                 }
1009
1010                 reqid = reply->hdr.reqid;
1011
1012                 DEBUG(10, ("Received reqid %d\n", (int)reqid));
1013
1014                 for (i=0; i<num_pids; i++) {
1015                         if (reqid == reqids[i]) {
1016                                 break;
1017                         }
1018                 }
1019                 if (i == num_pids) {
1020                         DEBUG(10, ("Received unknown record number %u\n",
1021                                    (unsigned)reqid));
1022                         goto fail;
1023                 }
1024                 results[i] = ((reply->status) == 0);
1025                 TALLOC_FREE(reply);
1026                 num_received += 1;
1027         }
1028
1029         result = true;
1030 fail:
1031         TALLOC_FREE(frame);
1032         return result;
1033 }
1034
1035 /*
1036  * Get a db path
1037  */
1038 char *ctdbd_dbpath(struct ctdbd_connection *conn,
1039                    TALLOC_CTX *mem_ctx, uint32_t db_id)
1040 {
1041         NTSTATUS status;
1042         TDB_DATA data;
1043         int32_t cstatus;
1044
1045         data.dptr = (uint8_t*)&db_id;
1046         data.dsize = sizeof(db_id);
1047
1048         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1049                                CTDB_CONTROL_GETDBPATH, 0, 0, data,
1050                                mem_ctx, &data, &cstatus);
1051         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
1052                 DEBUG(0,(__location__ " ctdb_control for getdbpath failed\n"));
1053                 return NULL;
1054         }
1055
1056         return (char *)data.dptr;
1057 }
1058
1059 /*
1060  * attach to a ctdb database
1061  */
1062 NTSTATUS ctdbd_db_attach(struct ctdbd_connection *conn,
1063                          const char *name, uint32_t *db_id, int tdb_flags)
1064 {
1065         NTSTATUS status;
1066         TDB_DATA data;
1067         int32_t cstatus;
1068         bool persistent = (tdb_flags & TDB_CLEAR_IF_FIRST) == 0;
1069
1070         data.dptr = (uint8_t*)name;
1071         data.dsize = strlen(name)+1;
1072
1073         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1074                                persistent
1075                                ? CTDB_CONTROL_DB_ATTACH_PERSISTENT
1076                                : CTDB_CONTROL_DB_ATTACH,
1077                                tdb_flags, 0, data, NULL, &data, &cstatus);
1078         if (!NT_STATUS_IS_OK(status)) {
1079                 DEBUG(0, (__location__ " ctdb_control for db_attach "
1080                           "failed: %s\n", nt_errstr(status)));
1081                 return status;
1082         }
1083
1084         if (cstatus != 0 || data.dsize != sizeof(uint32_t)) {
1085                 DEBUG(0,(__location__ " ctdb_control for db_attach failed\n"));
1086                 return NT_STATUS_INTERNAL_ERROR;
1087         }
1088
1089         *db_id = *(uint32_t *)data.dptr;
1090         talloc_free(data.dptr);
1091
1092         if (!(tdb_flags & TDB_SEQNUM)) {
1093                 return NT_STATUS_OK;
1094         }
1095
1096         data.dptr = (uint8_t *)db_id;
1097         data.dsize = sizeof(*db_id);
1098
1099         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1100                                CTDB_CONTROL_ENABLE_SEQNUM, 0, 0, data,
1101                                NULL, NULL, &cstatus);
1102         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
1103                 DEBUG(0,(__location__ " ctdb_control for enable seqnum "
1104                          "failed\n"));
1105                 return NT_STATUS_IS_OK(status) ? NT_STATUS_INTERNAL_ERROR :
1106                         status;
1107         }
1108
1109         return NT_STATUS_OK;
1110 }
1111
1112 /*
1113  * force the migration of a record to this node
1114  */
1115 NTSTATUS ctdbd_migrate(struct ctdbd_connection *conn, uint32 db_id,
1116                        TDB_DATA key)
1117 {
1118         struct ctdb_req_call req;
1119         struct ctdb_reply_call *reply;
1120         NTSTATUS status;
1121
1122         ZERO_STRUCT(req);
1123
1124         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
1125         req.hdr.ctdb_magic   = CTDB_MAGIC;
1126         req.hdr.ctdb_version = CTDB_VERSION;
1127         req.hdr.operation    = CTDB_REQ_CALL;
1128         req.hdr.reqid        = ctdbd_next_reqid(conn);
1129         req.flags            = CTDB_IMMEDIATE_MIGRATION;
1130         req.callid           = CTDB_NULL_FUNC;
1131         req.db_id            = db_id;
1132         req.keylen           = key.dsize;
1133
1134         DEBUG(10, ("ctdbd_migrate: Sending ctdb packet\n"));
1135         ctdb_packet_dump(&req.hdr);
1136
1137         status = ctdb_packet_send(
1138                 conn->pkt, 2,
1139                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
1140                 data_blob_const(key.dptr, key.dsize));
1141
1142         if (!NT_STATUS_IS_OK(status)) {
1143                 DEBUG(3, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
1144                 return status;
1145         }
1146
1147         status = ctdb_packet_flush(conn->pkt);
1148
1149         if (!NT_STATUS_IS_OK(status)) {
1150                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
1151                 cluster_fatal("cluster dispatch daemon control write error\n");
1152         }
1153
1154         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
1155
1156         if (!NT_STATUS_IS_OK(status)) {
1157                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1158                 goto fail;
1159         }
1160
1161         if (reply->hdr.operation != CTDB_REPLY_CALL) {
1162                 DEBUG(0, ("received invalid reply\n"));
1163                 status = NT_STATUS_INTERNAL_ERROR;
1164                 goto fail;
1165         }
1166
1167         status = NT_STATUS_OK;
1168  fail:
1169
1170         TALLOC_FREE(reply);
1171         return status;
1172 }
1173
1174 /*
1175  * remotely fetch a record without locking it or forcing a migration
1176  */
1177 NTSTATUS ctdbd_fetch(struct ctdbd_connection *conn, uint32 db_id,
1178                      TDB_DATA key, TALLOC_CTX *mem_ctx, TDB_DATA *data)
1179 {
1180         struct ctdb_req_call req;
1181         struct ctdb_reply_call *reply;
1182         NTSTATUS status;
1183
1184         ZERO_STRUCT(req);
1185
1186         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
1187         req.hdr.ctdb_magic   = CTDB_MAGIC;
1188         req.hdr.ctdb_version = CTDB_VERSION;
1189         req.hdr.operation    = CTDB_REQ_CALL;
1190         req.hdr.reqid        = ctdbd_next_reqid(conn);
1191         req.flags            = 0;
1192         req.callid           = CTDB_FETCH_FUNC;
1193         req.db_id            = db_id;
1194         req.keylen           = key.dsize;
1195
1196         status = ctdb_packet_send(
1197                 conn->pkt, 2,
1198                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
1199                 data_blob_const(key.dptr, key.dsize));
1200
1201         if (!NT_STATUS_IS_OK(status)) {
1202                 DEBUG(3, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
1203                 return status;
1204         }
1205
1206         status = ctdb_packet_flush(conn->pkt);
1207
1208         if (!NT_STATUS_IS_OK(status)) {
1209                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
1210                 cluster_fatal("cluster dispatch daemon control write error\n");
1211         }
1212
1213         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
1214
1215         if (!NT_STATUS_IS_OK(status)) {
1216                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1217                 goto fail;
1218         }
1219
1220         if (reply->hdr.operation != CTDB_REPLY_CALL) {
1221                 DEBUG(0, ("received invalid reply\n"));
1222                 status = NT_STATUS_INTERNAL_ERROR;
1223                 goto fail;
1224         }
1225
1226         data->dsize = reply->datalen;
1227         if (data->dsize == 0) {
1228                 data->dptr = NULL;
1229                 goto done;
1230         }
1231
1232         data->dptr = (uint8 *)talloc_memdup(mem_ctx, &reply->data[0],
1233                                             reply->datalen);
1234         if (data->dptr == NULL) {
1235                 DEBUG(0, ("talloc failed\n"));
1236                 status = NT_STATUS_NO_MEMORY;
1237                 goto fail;
1238         }
1239
1240  done:
1241         status = NT_STATUS_OK;
1242  fail:
1243         TALLOC_FREE(reply);
1244         return status;
1245 }
1246
1247 struct ctdbd_traverse_state {
1248         void (*fn)(TDB_DATA key, TDB_DATA data, void *private_data);
1249         void *private_data;
1250 };
1251
1252 /*
1253  * Handle a traverse record coming in on the ctdbd connection
1254  */
1255
1256 static NTSTATUS ctdb_traverse_handler(uint8_t *buf, size_t length,
1257                                       void *private_data)
1258 {
1259         struct ctdbd_traverse_state *state =
1260                 (struct ctdbd_traverse_state *)private_data;
1261
1262         struct ctdb_req_message *m;
1263         struct ctdb_rec_data *d;
1264         TDB_DATA key, data;
1265
1266         m = (struct ctdb_req_message *)buf;
1267
1268         if (length < sizeof(*m) || m->hdr.length != length) {
1269                 DEBUG(0, ("Got invalid message of length %d\n", (int)length));
1270                 TALLOC_FREE(buf);
1271                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1272         }
1273
1274         d = (struct ctdb_rec_data *)&m->data[0];
1275         if (m->datalen < sizeof(uint32_t) || m->datalen != d->length) {
1276                 DEBUG(0, ("Got invalid traverse data of length %d\n",
1277                           (int)m->datalen));
1278                 TALLOC_FREE(buf);
1279                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1280         }
1281
1282         key.dsize = d->keylen;
1283         key.dptr  = &d->data[0];
1284         data.dsize = d->datalen;
1285         data.dptr = &d->data[d->keylen];
1286
1287         if (key.dsize == 0 && data.dsize == 0) {
1288                 /* end of traverse */
1289                 return NT_STATUS_END_OF_FILE;
1290         }
1291
1292         if (data.dsize < sizeof(struct ctdb_ltdb_header)) {
1293                 DEBUG(0, ("Got invalid ltdb header length %d\n",
1294                           (int)data.dsize));
1295                 TALLOC_FREE(buf);
1296                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1297         }
1298         data.dsize -= sizeof(struct ctdb_ltdb_header);
1299         data.dptr += sizeof(struct ctdb_ltdb_header);
1300
1301         if (state->fn) {
1302                 state->fn(key, data, state->private_data);
1303         }
1304
1305         TALLOC_FREE(buf);
1306         return NT_STATUS_OK;
1307 }
1308
1309 /*
1310   Traverse a ctdb database. This uses a kind-of hackish way to open a second
1311   connection to ctdbd to avoid the hairy recursive and async problems with
1312   everything in-line.
1313 */
1314
1315 NTSTATUS ctdbd_traverse(uint32 db_id,
1316                         void (*fn)(TDB_DATA key, TDB_DATA data,
1317                                    void *private_data),
1318                         void *private_data)
1319 {
1320         struct ctdbd_connection *conn;
1321         NTSTATUS status;
1322
1323         TDB_DATA data;
1324         struct ctdb_traverse_start t;
1325         int cstatus;
1326         struct ctdbd_traverse_state state;
1327
1328         status = ctdbd_init_connection(NULL, &conn);
1329         if (!NT_STATUS_IS_OK(status)) {
1330                 DEBUG(0, ("ctdbd_init_connection failed: %s\n",
1331                           nt_errstr(status)));
1332                 return status;
1333         }
1334
1335         t.db_id = db_id;
1336         t.srvid = conn->rand_srvid;
1337         t.reqid = ctdbd_next_reqid(conn);
1338
1339         data.dptr = (uint8_t *)&t;
1340         data.dsize = sizeof(t);
1341
1342         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1343                                CTDB_CONTROL_TRAVERSE_START, conn->rand_srvid, 0,
1344                                data, NULL, NULL, &cstatus);
1345
1346         if (!NT_STATUS_IS_OK(status) || (cstatus != 0)) {
1347
1348                 DEBUG(0,("ctdbd_control failed: %s, %d\n", nt_errstr(status),
1349                          cstatus));
1350
1351                 if (NT_STATUS_IS_OK(status)) {
1352                         /*
1353                          * We need a mapping here
1354                          */
1355                         status = NT_STATUS_UNSUCCESSFUL;
1356                 }
1357                 goto done;
1358         }
1359
1360         state.fn = fn;
1361         state.private_data = private_data;
1362
1363         while (True) {
1364
1365                 status = NT_STATUS_OK;
1366
1367                 if (ctdb_packet_handler(conn->pkt, ctdb_req_complete,
1368                                    ctdb_traverse_handler, &state, &status)) {
1369
1370                         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1371                                 status = NT_STATUS_OK;
1372                                 break;
1373                         }
1374
1375                         /*
1376                          * There might be more in the queue
1377                          */
1378                         continue;
1379                 }
1380
1381                 if (!NT_STATUS_IS_OK(status)) {
1382                         break;
1383                 }
1384
1385                 status = ctdb_packet_fd_read_sync(conn->pkt);
1386
1387                 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1388                         /*
1389                          * There might be more in the queue
1390                          */
1391                         continue;
1392                 }
1393
1394                 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1395                         status = NT_STATUS_OK;
1396                         break;
1397                 }
1398
1399                 if (!NT_STATUS_IS_OK(status)) {
1400                         DEBUG(0, ("ctdb_packet_fd_read_sync failed: %s\n", nt_errstr(status)));
1401                         cluster_fatal("ctdbd died\n");
1402                 }
1403         }
1404
1405  done:
1406         TALLOC_FREE(conn);
1407         return status;
1408 }
1409
1410 /*
1411    This is used to canonicalize a ctdb_sock_addr structure.
1412 */
1413 static void smbd_ctdb_canonicalize_ip(const struct sockaddr_storage *in,
1414                                       struct sockaddr_storage *out)
1415 {
1416         memcpy(out, in, sizeof (*out));
1417
1418 #ifdef HAVE_IPV6
1419         if (in->ss_family == AF_INET6) {
1420                 const char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
1421                 const struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)in;
1422                 struct sockaddr_in *out4 = (struct sockaddr_in *)out;
1423                 if (memcmp(&in6->sin6_addr, prefix, 12) == 0) {
1424                         memset(out, 0, sizeof(*out));
1425 #ifdef HAVE_SOCK_SIN_LEN
1426                         out4->sin_len = sizeof(*out);
1427 #endif
1428                         out4->sin_family = AF_INET;
1429                         out4->sin_port   = in6->sin6_port;
1430                         memcpy(&out4->sin_addr, &in6->sin6_addr.s6_addr32[3], 4);
1431                 }
1432         }
1433 #endif
1434 }
1435
1436 /*
1437  * Register us as a server for a particular tcp connection
1438  */
1439
1440 NTSTATUS ctdbd_register_ips(struct ctdbd_connection *conn,
1441                             const struct sockaddr_storage *_server,
1442                             const struct sockaddr_storage *_client,
1443                             void (*release_ip_handler)(const char *ip_addr,
1444                                                        void *private_data),
1445                             void *private_data)
1446 {
1447         /*
1448          * we still use ctdb_control_tcp for ipv4
1449          * because we want to work against older ctdb
1450          * versions at runtime
1451          */
1452         struct ctdb_control_tcp p4;
1453 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1454         struct ctdb_control_tcp_addr p;
1455 #endif
1456         TDB_DATA data;
1457         NTSTATUS status;
1458         struct sockaddr_storage client;
1459         struct sockaddr_storage server;
1460
1461         /*
1462          * Only one connection so far
1463          */
1464         SMB_ASSERT(conn->release_ip_handler == NULL);
1465
1466         smbd_ctdb_canonicalize_ip(_client, &client);
1467         smbd_ctdb_canonicalize_ip(_server, &server);
1468
1469         switch (client.ss_family) {
1470         case AF_INET:
1471                 memcpy(&p4.dest, &server, sizeof(p4.dest));
1472                 memcpy(&p4.src, &client, sizeof(p4.src));
1473                 data.dptr = (uint8_t *)&p4;
1474                 data.dsize = sizeof(p4);
1475                 break;
1476 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1477         case AF_INET6:
1478                 memcpy(&p.dest.ip6, &server, sizeof(p.dest.ip6));
1479                 memcpy(&p.src.ip6, &client, sizeof(p.src.ip6));
1480                 data.dptr = (uint8_t *)&p;
1481                 data.dsize = sizeof(p);
1482                 break;
1483 #endif
1484         default:
1485                 return NT_STATUS_INTERNAL_ERROR;
1486         }
1487
1488         conn->release_ip_handler = release_ip_handler;
1489         conn->release_ip_priv = private_data;
1490
1491         /*
1492          * We want to be told about IP releases
1493          */
1494
1495         status = register_with_ctdbd(conn, CTDB_SRVID_RELEASE_IP);
1496         if (!NT_STATUS_IS_OK(status)) {
1497                 return status;
1498         }
1499
1500         /*
1501          * inform ctdb of our tcp connection, so if IP takeover happens ctdb
1502          * can send an extra ack to trigger a reset for our client, so it
1503          * immediately reconnects
1504          */
1505         return ctdbd_control(conn, CTDB_CURRENT_NODE,
1506                              CTDB_CONTROL_TCP_CLIENT, 0,
1507                              CTDB_CTRL_FLAG_NOREPLY, data, NULL, NULL, NULL);
1508 }
1509
1510 /*
1511  * We want to handle reconfigure events
1512  */
1513 NTSTATUS ctdbd_register_reconfigure(struct ctdbd_connection *conn)
1514 {
1515         return register_with_ctdbd(conn, CTDB_SRVID_RECONFIGURE);
1516 }
1517
1518 /*
1519   call a control on the local node
1520  */
1521 NTSTATUS ctdbd_control_local(struct ctdbd_connection *conn, uint32 opcode,
1522                              uint64_t srvid, uint32_t flags, TDB_DATA data,
1523                              TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
1524                              int *cstatus)
1525 {
1526         return ctdbd_control(conn, CTDB_CURRENT_NODE, opcode, srvid, flags, data, mem_ctx, outdata, cstatus);
1527 }
1528
1529 NTSTATUS ctdb_watch_us(struct ctdbd_connection *conn)
1530 {
1531         struct ctdb_client_notify_register reg_data;
1532         size_t struct_len;
1533         NTSTATUS status;
1534         int cstatus;
1535
1536         reg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1537         reg_data.len = 1;
1538         reg_data.notify_data[0] = 0;
1539
1540         struct_len = offsetof(struct ctdb_client_notify_register,
1541                               notify_data) + reg_data.len;
1542
1543         status = ctdbd_control_local(
1544                 conn, CTDB_CONTROL_REGISTER_NOTIFY, conn->rand_srvid, 0,
1545                 make_tdb_data((uint8_t *)&reg_data, struct_len),
1546                 NULL, NULL, &cstatus);
1547         if (!NT_STATUS_IS_OK(status)) {
1548                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1549                           nt_errstr(status)));
1550         }
1551         return status;
1552 }
1553
1554 NTSTATUS ctdb_unwatch(struct ctdbd_connection *conn)
1555 {
1556         struct ctdb_client_notify_deregister dereg_data;
1557         NTSTATUS status;
1558         int cstatus;
1559
1560         dereg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1561
1562         status = ctdbd_control_local(
1563                 conn, CTDB_CONTROL_DEREGISTER_NOTIFY, conn->rand_srvid, 0,
1564                 make_tdb_data((uint8_t *)&dereg_data, sizeof(dereg_data)),
1565                 NULL, NULL, &cstatus);
1566         if (!NT_STATUS_IS_OK(status)) {
1567                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1568                           nt_errstr(status)));
1569         }
1570         return status;
1571 }
1572
1573 #endif