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 NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
  66                               uint32_t vnn, uint32 opcode,
  67                               uint64_t srvid, uint32_t flags, TDB_DATA data,
  68                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
  69                               int *cstatus);
  70
  71 /*
  72  * exit on fatal communications errors with the ctdbd daemon
  73  */
  74 static void cluster_fatal(const char *why)
  75 {
  76         DEBUG(0,("cluster fatal event: %s - exiting immediately\n", why));
  77         /* we don't use smb_panic() as we don't want to delay to write
  78            a core file. We need to release this process id immediately
  79            so that someone else can take over without getting sharing
  80            violations */
  81         _exit(1);
  82 }
  83
  84 /*
  85  *
  86  */
  87 static void ctdb_packet_dump(struct ctdb_req_header *hdr)
  88 {
  89         if (DEBUGLEVEL < 10) {
  90                 return;
  91         }
  92         DEBUGADD(10, ("len=%d, magic=%x, vers=%d, gen=%d, op=%d, reqid=%d\n",
  93                       (int)hdr->length, (int)hdr->ctdb_magic,
  94                       (int)hdr->ctdb_version, (int)hdr->generation,
  95                       (int)hdr->operation, (int)hdr->reqid));
  96 }
  97
  98 /*
  99  * Register a srvid with ctdbd
 100  */
 101 static NTSTATUS register_with_ctdbd(struct ctdbd_connection *conn,
 102                                     uint64_t srvid)
 103 {
 104
 105         int cstatus;
 106         return ctdbd_control(conn, CTDB_CURRENT_NODE,
 107                              CTDB_CONTROL_REGISTER_SRVID, srvid, 0,
 108                              tdb_null, NULL, NULL, &cstatus);
 109 }
 110
 111 /*
 112  * get our vnn from the cluster
 113  */
 114 static NTSTATUS get_cluster_vnn(struct ctdbd_connection *conn, uint32 *vnn)
 115 {
 116         int32_t cstatus=-1;
 117         NTSTATUS status;
 118         status = ctdbd_control(conn,
 119                                CTDB_CURRENT_NODE, CTDB_CONTROL_GET_PNN, 0, 0,
 120                                tdb_null, NULL, NULL, &cstatus);
 121         if (!NT_STATUS_IS_OK(status)) {
 122                 cluster_fatal("ctdbd_control failed\n");
 123         }
 124         *vnn = (uint32_t)cstatus;
 125         return status;
 126 }
 127
 128 /*
 129  * Are we active (i.e. not banned or stopped?)
 130  */
 131 static bool ctdbd_working(struct ctdbd_connection *conn, uint32_t vnn)
 132 {
 133         int32_t cstatus=-1;
 134         NTSTATUS status;
 135         TDB_DATA outdata;
 136         struct ctdb_node_map *m;
 137         uint32_t failure_flags;
 138         bool ret = false;
 139         int i;
 140
 141         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 142                                CTDB_CONTROL_GET_NODEMAP, 0, 0,
 143                                tdb_null, talloc_tos(), &outdata, &cstatus);
 144         if (!NT_STATUS_IS_OK(status)) {
 145                 cluster_fatal("ctdbd_control failed\n");
 146         }
 147         if ((cstatus != 0) || (outdata.dptr == NULL)) {
 148                 DEBUG(2, ("Received invalid ctdb data\n"));
 149                 return false;
 150         }
 151
 152         m = (struct ctdb_node_map *)outdata.dptr;
 153
 154         for (i=0; i<m->num; i++) {
 155                 if (vnn == m->nodes[i].pnn) {
 156                         break;
 157                 }
 158         }
 159
 160         if (i == m->num) {
 161                 DEBUG(2, ("Did not find ourselves (node %d) in nodemap\n",
 162                           (int)vnn));
 163                 goto fail;
 164         }
 165
 166         failure_flags = NODE_FLAGS_BANNED | NODE_FLAGS_DISCONNECTED
 167                 | NODE_FLAGS_PERMANENTLY_DISABLED | NODE_FLAGS_STOPPED;
 168
 169         if ((m->nodes[i].flags & failure_flags) != 0) {
 170                 DEBUG(2, ("Node has status %x, not active\n",
 171                           (int)m->nodes[i].flags));
 172                 goto fail;
 173         }
 174
 175         ret = true;
 176 fail:
 177         TALLOC_FREE(outdata.dptr);
 178         return ret;
 179 }
 180
 181 uint32 ctdbd_vnn(const struct ctdbd_connection *conn)
 182 {
 183         return conn->our_vnn;
 184 }
 185
 186 /*
 187  * Get us a ctdb connection
 188  */
 189
 190 static NTSTATUS ctdbd_connect(TALLOC_CTX *mem_ctx,
 191                               struct ctdb_packet_context **presult)
 192 {
 193         struct ctdb_packet_context *result;
 194         const char *sockname = lp_ctdbd_socket();
 195         struct sockaddr_un addr;
 196         int fd;
 197
 198         if (!sockname || !*sockname) {
 199                 sockname = CTDB_PATH;
 200         }
 201
 202         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 203         if (fd == -1) {
 204                 DEBUG(3, ("Could not create socket: %s\n", strerror(errno)));
 205                 return map_nt_error_from_unix(errno);
 206         }
 207
 208         ZERO_STRUCT(addr);
 209         addr.sun_family = AF_UNIX;
 210         strncpy(addr.sun_path, sockname, sizeof(addr.sun_path));
 211
 212         if (sys_connect(fd, (struct sockaddr *)(void *)&addr) == -1) {
 213                 DEBUG(1, ("connect(%s) failed: %s\n", sockname,
 214                           strerror(errno)));
 215                 close(fd);
 216                 return map_nt_error_from_unix(errno);
 217         }
 218
 219         if (!(result = ctdb_packet_init(mem_ctx, fd))) {
 220                 close(fd);
 221                 return NT_STATUS_NO_MEMORY;
 222         }
 223
 224         *presult = result;
 225         return NT_STATUS_OK;
 226 }
 227
 228 /*
 229  * Do we have a complete ctdb packet in the queue?
 230  */
 231
 232 static bool ctdb_req_complete(const uint8_t *buf, size_t available,
 233                               size_t *length,
 234                               void *private_data)
 235 {
 236         uint32 msglen;
 237
 238         if (available < sizeof(msglen)) {
 239                 return False;
 240         }
 241
 242         msglen = *((uint32 *)buf);
 243
 244         DEBUG(10, ("msglen = %d\n", msglen));
 245
 246         if (msglen < sizeof(struct ctdb_req_header)) {
 247                 DEBUG(0, ("Got invalid msglen: %d, expected at least %d for "
 248                           "the req_header\n", (int)msglen,
 249                           (int)sizeof(struct ctdb_req_header)));
 250                 cluster_fatal("ctdbd protocol error\n");
 251         }
 252
 253         if (available < msglen) {
 254                 return false;
 255         }
 256
 257         *length = msglen;
 258         return true;
 259 }
 260
 261 /*
 262  * State necessary to defer an incoming message while we are waiting for a
 263  * ctdb reply.
 264  */
 265
 266 struct deferred_msg_state {
 267         struct messaging_context *msg_ctx;
 268         struct messaging_rec *rec;
 269 };
 270
 271 /*
 272  * Timed event handler for the deferred message
 273  */
 274
 275 static void deferred_message_dispatch(struct event_context *event_ctx,
 276                                       struct timed_event *te,
 277                                       struct timeval now,
 278                                       void *private_data)
 279 {
 280         struct deferred_msg_state *state = talloc_get_type_abort(
 281                 private_data, struct deferred_msg_state);
 282
 283         messaging_dispatch_rec(state->msg_ctx, state->rec);
 284         TALLOC_FREE(state);
 285         TALLOC_FREE(te);
 286 }
 287
 288 struct req_pull_state {
 289         TALLOC_CTX *mem_ctx;
 290         DATA_BLOB req;
 291 };
 292
 293 /*
 294  * Pull a ctdb request out of the incoming ctdb_packet queue
 295  */
 296
 297 static NTSTATUS ctdb_req_pull(uint8_t *buf, size_t length,
 298                               void *private_data)
 299 {
 300         struct req_pull_state *state = (struct req_pull_state *)private_data;
 301
 302         state->req.data = talloc_move(state->mem_ctx, &buf);
 303         state->req.length = length;
 304         return NT_STATUS_OK;
 305 }
 306
 307 /*
 308  * Fetch a messaging_rec from an incoming ctdb style message
 309  */
 310
 311 static struct messaging_rec *ctdb_pull_messaging_rec(TALLOC_CTX *mem_ctx,
 312                                                      size_t overall_length,
 313                                                      struct ctdb_req_message *msg)
 314 {
 315         struct messaging_rec *result;
 316         DATA_BLOB blob;
 317         enum ndr_err_code ndr_err;
 318
 319         if ((overall_length < offsetof(struct ctdb_req_message, data))
 320             || (overall_length
 321                 < offsetof(struct ctdb_req_message, data) + msg->datalen)) {
 322
 323                 cluster_fatal("got invalid msg length");
 324         }
 325
 326         if (!(result = talloc(mem_ctx, struct messaging_rec))) {
 327                 DEBUG(0, ("talloc failed\n"));
 328                 return NULL;
 329         }
 330
 331         blob = data_blob_const(msg->data, msg->datalen);
 332
 333         ndr_err = ndr_pull_struct_blob(
 334                 &blob, result, result,
 335                 (ndr_pull_flags_fn_t)ndr_pull_messaging_rec);
 336
 337         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 338                 DEBUG(0, ("ndr_pull_struct_blob failed: %s\n",
 339                           ndr_errstr(ndr_err)));
 340                 TALLOC_FREE(result);
 341                 return NULL;
 342         }
 343
 344         if (DEBUGLEVEL >= 10) {
 345                 DEBUG(10, ("ctdb_pull_messaging_rec:\n"));
 346                 NDR_PRINT_DEBUG(messaging_rec, result);
 347         }
 348
 349         return result;
 350 }
 351
 352 static NTSTATUS ctdb_packet_fd_read_sync(struct ctdb_packet_context *ctx)
 353 {
 354         int timeout = lp_ctdb_timeout();
 355
 356         if (timeout == 0) {
 357                 timeout = -1;
 358         }
 359         return ctdb_packet_fd_read_sync_timeout(ctx, timeout);
 360 }
 361
 362 /*
 363  * Read a full ctdbd request. If we have a messaging context, defer incoming
 364  * messages that might come in between.
 365  */
 366
 367 static NTSTATUS ctdb_read_req(struct ctdbd_connection *conn, uint32 reqid,
 368                               TALLOC_CTX *mem_ctx, void *result)
 369 {
 370         struct ctdb_req_header *hdr;
 371         struct req_pull_state state;
 372         NTSTATUS status;
 373
 374  again:
 375
 376         status = ctdb_packet_fd_read_sync(conn->pkt);
 377
 378         if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_BUSY)) {
 379                 /* EAGAIN */
 380                 goto again;
 381         } else if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 382                 /* EAGAIN */
 383                 goto again;
 384         }
 385
 386         if (!NT_STATUS_IS_OK(status)) {
 387                 DEBUG(0, ("ctdb_packet_fd_read failed: %s\n", nt_errstr(status)));
 388                 cluster_fatal("ctdbd died\n");
 389         }
 390
 391  next_pkt:
 392
 393         ZERO_STRUCT(state);
 394         state.mem_ctx = mem_ctx;
 395
 396         if (!ctdb_packet_handler(conn->pkt, ctdb_req_complete, ctdb_req_pull,
 397                             &state, &status)) {
 398                 /*
 399                  * Not enough data
 400                  */
 401                 DEBUG(10, ("not enough data from ctdb socket, retrying\n"));
 402                 goto again;
 403         }
 404
 405         if (!NT_STATUS_IS_OK(status)) {
 406                 DEBUG(0, ("Could not read ctdb_packet: %s\n", nt_errstr(status)));
 407                 cluster_fatal("ctdbd died\n");
 408         }
 409
 410         hdr = (struct ctdb_req_header *)state.req.data;
 411
 412         DEBUG(10, ("Received ctdb packet\n"));
 413         ctdb_packet_dump(hdr);
 414
 415         if (hdr->operation == CTDB_REQ_MESSAGE) {
 416                 struct timed_event *evt;
 417                 struct deferred_msg_state *msg_state;
 418                 struct ctdb_req_message *msg = (struct ctdb_req_message *)hdr;
 419
 420                 if (conn->msg_ctx == NULL) {
 421                         DEBUG(1, ("Got a message without having a msg ctx, "
 422                                   "dropping msg %llu\n",
 423                                   (long long unsigned)msg->srvid));
 424                         goto next_pkt;
 425                 }
 426
 427                 if ((conn->release_ip_handler != NULL)
 428                     && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 429                         /* must be dispatched immediately */
 430                         DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 431                         conn->release_ip_handler((const char *)msg->data,
 432                                                  conn->release_ip_priv);
 433                         TALLOC_FREE(hdr);
 434                         goto next_pkt;
 435                 }
 436
 437                 if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 438                     || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)) {
 439
 440                         DEBUG(1, ("ctdb_read_req: Got %s message\n",
 441                                   (msg->srvid == CTDB_SRVID_RECONFIGURE)
 442                                   ? "cluster reconfigure" : "SAMBA_NOTIFY"));
 443
 444                         messaging_send(conn->msg_ctx,
 445                                        messaging_server_id(conn->msg_ctx),
 446                                        MSG_SMB_BRL_VALIDATE, &data_blob_null);
 447                         messaging_send(conn->msg_ctx,
 448                                        messaging_server_id(conn->msg_ctx),
 449                                        MSG_DBWRAP_G_LOCK_RETRY,
 450                                        &data_blob_null);
 451                         TALLOC_FREE(hdr);
 452                         goto next_pkt;
 453                 }
 454
 455                 msg_state = talloc(NULL, struct deferred_msg_state);
 456                 if (msg_state == NULL) {
 457                         DEBUG(0, ("talloc failed\n"));
 458                         TALLOC_FREE(hdr);
 459                         goto next_pkt;
 460                 }
 461
 462                 if (!(msg_state->rec = ctdb_pull_messaging_rec(
 463                               msg_state, state.req.length, msg))) {
 464                         DEBUG(0, ("ctdbd_pull_messaging_rec failed\n"));
 465                         TALLOC_FREE(msg_state);
 466                         TALLOC_FREE(hdr);
 467                         goto next_pkt;
 468                 }
 469
 470                 TALLOC_FREE(hdr);
 471
 472                 msg_state->msg_ctx = conn->msg_ctx;
 473
 474                 /*
 475                  * We're waiting for a call reply, but an async message has
 476                  * crossed. Defer dispatching to the toplevel event loop.
 477                  */
 478                 evt = event_add_timed(conn->msg_ctx->event_ctx,
 479                                       conn->msg_ctx->event_ctx,
 480                                       timeval_zero(),
 481                                       deferred_message_dispatch,
 482                                       msg_state);
 483                 if (evt == NULL) {
 484                         DEBUG(0, ("event_add_timed failed\n"));
 485                         TALLOC_FREE(msg_state);
 486                         TALLOC_FREE(hdr);
 487                         goto next_pkt;
 488                 }
 489
 490                 goto next_pkt;
 491         }
 492
 493         if (hdr->reqid != reqid) {
 494                 /* we got the wrong reply */
 495                 DEBUG(0,("Discarding mismatched ctdb reqid %u should have "
 496                          "been %u\n", hdr->reqid, reqid));
 497                 TALLOC_FREE(hdr);
 498                 goto again;
 499         }
 500
 501         *((void **)result) = talloc_move(mem_ctx, &hdr);
 502
 503         return NT_STATUS_OK;
 504 }
 505
 506 /*
 507  * Get us a ctdbd connection
 508  */
 509
 510 static NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
 511                                       struct ctdbd_connection **pconn)
 512 {
 513         struct ctdbd_connection *conn;
 514         NTSTATUS status;
 515
 516         if (!(conn = talloc_zero(mem_ctx, struct ctdbd_connection))) {
 517                 DEBUG(0, ("talloc failed\n"));
 518                 return NT_STATUS_NO_MEMORY;
 519         }
 520
 521         status = ctdbd_connect(conn, &conn->pkt);
 522
 523         if (!NT_STATUS_IS_OK(status)) {
 524                 DEBUG(10, ("ctdbd_connect failed: %s\n", nt_errstr(status)));
 525                 goto fail;
 526         }
 527
 528         status = get_cluster_vnn(conn, &conn->our_vnn);
 529
 530         if (!NT_STATUS_IS_OK(status)) {
 531                 DEBUG(10, ("get_cluster_vnn failed: %s\n", nt_errstr(status)));
 532                 goto fail;
 533         }
 534
 535         if (!ctdbd_working(conn, conn->our_vnn)) {
 536                 DEBUG(2, ("Node is not working, can not connect\n"));
 537                 status = NT_STATUS_INTERNAL_DB_ERROR;
 538                 goto fail;
 539         }
 540
 541         generate_random_buffer((unsigned char *)&conn->rand_srvid,
 542                                sizeof(conn->rand_srvid));
 543
 544         status = register_with_ctdbd(conn, conn->rand_srvid);
 545
 546         if (!NT_STATUS_IS_OK(status)) {
 547                 DEBUG(5, ("Could not register random srvid: %s\n",
 548                           nt_errstr(status)));
 549                 goto fail;
 550         }
 551
 552         *pconn = conn;
 553         return NT_STATUS_OK;
 554
 555  fail:
 556         TALLOC_FREE(conn);
 557         return status;
 558 }
 559
 560 /*
 561  * Get us a ctdbd connection and register us as a process
 562  */
 563
 564 NTSTATUS ctdbd_messaging_connection(TALLOC_CTX *mem_ctx,
 565                                     struct ctdbd_connection **pconn)
 566 {
 567         struct ctdbd_connection *conn;
 568         NTSTATUS status;
 569
 570         status = ctdbd_init_connection(mem_ctx, &conn);
 571
 572         if (!NT_STATUS_IS_OK(status)) {
 573                 return status;
 574         }
 575
 576         status = register_with_ctdbd(conn, (uint64_t)sys_getpid());
 577         if (!NT_STATUS_IS_OK(status)) {
 578                 goto fail;
 579         }
 580
 581         status = register_with_ctdbd(conn, MSG_SRVID_SAMBA);
 582         if (!NT_STATUS_IS_OK(status)) {
 583                 goto fail;
 584         }
 585
 586         status = register_with_ctdbd(conn, CTDB_SRVID_SAMBA_NOTIFY);
 587         if (!NT_STATUS_IS_OK(status)) {
 588                 goto fail;
 589         }
 590
 591         *pconn = conn;
 592         return NT_STATUS_OK;
 593
 594  fail:
 595         TALLOC_FREE(conn);
 596         return status;
 597 }
 598
 599 struct messaging_context *ctdb_conn_msg_ctx(struct ctdbd_connection *conn)
 600 {
 601         return conn->msg_ctx;
 602 }
 603
 604 int ctdbd_conn_get_fd(struct ctdbd_connection *conn)
 605 {
 606         return ctdb_packet_get_fd(conn->pkt);
 607 }
 608
 609 /*
 610  * Packet handler to receive and handle a ctdb message
 611  */
 612 static NTSTATUS ctdb_handle_message(uint8_t *buf, size_t length,
 613                                     void *private_data)
 614 {
 615         struct ctdbd_connection *conn = talloc_get_type_abort(
 616                 private_data, struct ctdbd_connection);
 617         struct ctdb_req_message *msg;
 618         struct messaging_rec *msg_rec;
 619
 620         msg = (struct ctdb_req_message *)buf;
 621
 622         if (msg->hdr.operation != CTDB_REQ_MESSAGE) {
 623                 DEBUG(0, ("Received async msg of type %u, discarding\n",
 624                           msg->hdr.operation));
 625                 TALLOC_FREE(buf);
 626                 return NT_STATUS_INVALID_PARAMETER;
 627         }
 628
 629         if ((conn->release_ip_handler != NULL)
 630             && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 631                 /* must be dispatched immediately */
 632                 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 633                 conn->release_ip_handler((const char *)msg->data,
 634                                          conn->release_ip_priv);
 635                 TALLOC_FREE(buf);
 636                 return NT_STATUS_OK;
 637         }
 638
 639         SMB_ASSERT(conn->msg_ctx != NULL);
 640
 641         if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 642             || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)){
 643                 DEBUG(0,("Got cluster reconfigure message\n"));
 644                 /*
 645                  * when the cluster is reconfigured or someone of the
 646                  * family has passed away (SAMBA_NOTIFY), we need to
 647                  * clean the brl database
 648                  */
 649                 messaging_send(conn->msg_ctx,
 650                                messaging_server_id(conn->msg_ctx),
 651                                MSG_SMB_BRL_VALIDATE, &data_blob_null);
 652
 653                 messaging_send(conn->msg_ctx,
 654                                messaging_server_id(conn->msg_ctx),
 655                                MSG_DBWRAP_G_LOCK_RETRY,
 656                                &data_blob_null);
 657
 658                 TALLOC_FREE(buf);
 659                 return NT_STATUS_OK;
 660         }
 661
 662         /* only messages to our pid or the broadcast are valid here */
 663         if (msg->srvid != sys_getpid() && msg->srvid != MSG_SRVID_SAMBA) {
 664                 DEBUG(0,("Got unexpected message with srvid=%llu\n",
 665                          (unsigned long long)msg->srvid));
 666                 TALLOC_FREE(buf);
 667                 return NT_STATUS_OK;
 668         }
 669
 670         if (!(msg_rec = ctdb_pull_messaging_rec(NULL, length, msg))) {
 671                 DEBUG(10, ("ctdb_pull_messaging_rec failed\n"));
 672                 TALLOC_FREE(buf);
 673                 return NT_STATUS_NO_MEMORY;
 674         }
 675
 676         messaging_dispatch_rec(conn->msg_ctx, msg_rec);
 677
 678         TALLOC_FREE(msg_rec);
 679         TALLOC_FREE(buf);
 680         return NT_STATUS_OK;
 681 }
 682
 683 /*
 684  * The ctdbd socket is readable asynchronuously
 685  */
 686
 687 static void ctdbd_socket_handler(struct event_context *event_ctx,
 688                                  struct fd_event *event,
 689                                  uint16 flags,
 690                                  void *private_data)
 691 {
 692         struct ctdbd_connection *conn = talloc_get_type_abort(
 693                 private_data, struct ctdbd_connection);
 694
 695         NTSTATUS status;
 696
 697         status = ctdb_packet_fd_read(conn->pkt);
 698
 699         if (!NT_STATUS_IS_OK(status)) {
 700                 DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
 701                 cluster_fatal("ctdbd died\n");
 702         }
 703
 704         while (ctdb_packet_handler(conn->pkt, ctdb_req_complete,
 705                               ctdb_handle_message, conn, &status)) {
 706                 if (!NT_STATUS_IS_OK(status)) {
 707                         DEBUG(10, ("could not handle incoming message: %s\n",
 708                                    nt_errstr(status)));
 709                 }
 710         }
 711 }
 712
 713 /*
 714  * Prepare a ctdbd connection to receive messages
 715  */
 716
 717 NTSTATUS ctdbd_register_msg_ctx(struct ctdbd_connection *conn,
 718                                 struct messaging_context *msg_ctx)
 719 {
 720         SMB_ASSERT(conn->msg_ctx == NULL);
 721         SMB_ASSERT(conn->fde == NULL);
 722
 723         if (!(conn->fde = event_add_fd(msg_ctx->event_ctx, conn,
 724                                        ctdb_packet_get_fd(conn->pkt),
 725                                        EVENT_FD_READ,
 726                                        ctdbd_socket_handler,
 727                                        conn))) {
 728                 DEBUG(0, ("event_add_fd failed\n"));
 729                 return NT_STATUS_NO_MEMORY;
 730         }
 731
 732         conn->msg_ctx = msg_ctx;
 733
 734         return NT_STATUS_OK;
 735 }
 736
 737 /*
 738  * Send a messaging message across a ctdbd
 739  */
 740
 741 NTSTATUS ctdbd_messaging_send(struct ctdbd_connection *conn,
 742                               uint32 dst_vnn, uint64 dst_srvid,
 743                               struct messaging_rec *msg)
 744 {
 745         struct ctdb_req_message r;
 746         TALLOC_CTX *mem_ctx;
 747         DATA_BLOB blob;
 748         NTSTATUS status;
 749         enum ndr_err_code ndr_err;
 750
 751         if (!(mem_ctx = talloc_init("ctdbd_messaging_send"))) {
 752                 DEBUG(0, ("talloc failed\n"));
 753                 return NT_STATUS_NO_MEMORY;
 754         }
 755
 756         ndr_err = ndr_push_struct_blob(
 757                 &blob, mem_ctx, msg,
 758                 (ndr_push_flags_fn_t)ndr_push_messaging_rec);
 759
 760         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 761                 DEBUG(0, ("ndr_push_struct_blob failed: %s\n",
 762                           ndr_errstr(ndr_err)));
 763                 status = ndr_map_error2ntstatus(ndr_err);
 764                 goto fail;
 765         }
 766
 767         r.hdr.length = offsetof(struct ctdb_req_message, data) + blob.length;
 768         r.hdr.ctdb_magic = CTDB_MAGIC;
 769         r.hdr.ctdb_version = CTDB_VERSION;
 770         r.hdr.generation = 1;
 771         r.hdr.operation  = CTDB_REQ_MESSAGE;
 772         r.hdr.destnode   = dst_vnn;
 773         r.hdr.srcnode    = conn->our_vnn;
 774         r.hdr.reqid      = 0;
 775         r.srvid          = dst_srvid;
 776         r.datalen        = blob.length;
 777
 778         DEBUG(10, ("ctdbd_messaging_send: Sending ctdb packet\n"));
 779         ctdb_packet_dump(&r.hdr);
 780
 781         status = ctdb_packet_send(
 782                 conn->pkt, 2,
 783                 data_blob_const(&r, offsetof(struct ctdb_req_message, data)),
 784                 blob);
 785
 786         if (!NT_STATUS_IS_OK(status)) {
 787                 DEBUG(0, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
 788                 goto fail;
 789         }
 790
 791         status = ctdb_packet_flush(conn->pkt);
 792
 793         if (!NT_STATUS_IS_OK(status)) {
 794                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 795                 cluster_fatal("cluster dispatch daemon msg write error\n");
 796         }
 797
 798         status = NT_STATUS_OK;
 799  fail:
 800         TALLOC_FREE(mem_ctx);
 801         return status;
 802 }
 803
 804 /*
 805  * send/recv a generic ctdb control message
 806  */
 807 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
 808                               uint32_t vnn, uint32 opcode,
 809                               uint64_t srvid, uint32_t flags,
 810                               TDB_DATA data,
 811                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
 812                               int *cstatus)
 813 {
 814         struct ctdb_req_control req;
 815         struct ctdb_reply_control *reply = NULL;
 816         struct ctdbd_connection *new_conn = NULL;
 817         NTSTATUS status;
 818
 819         if (conn == NULL) {
 820                 status = ctdbd_init_connection(NULL, &new_conn);
 821
 822                 if (!NT_STATUS_IS_OK(status)) {
 823                         DEBUG(10, ("Could not init temp connection: %s\n",
 824                                    nt_errstr(status)));
 825                         goto fail;
 826                 }
 827
 828                 conn = new_conn;
 829         }
 830
 831         ZERO_STRUCT(req);
 832         req.hdr.length = offsetof(struct ctdb_req_control, data) + data.dsize;
 833         req.hdr.ctdb_magic   = CTDB_MAGIC;
 834         req.hdr.ctdb_version = CTDB_VERSION;
 835         req.hdr.operation    = CTDB_REQ_CONTROL;
 836         req.hdr.reqid        = ++conn->reqid;
 837         req.hdr.destnode     = vnn;
 838         req.opcode           = opcode;
 839         req.srvid            = srvid;
 840         req.datalen          = data.dsize;
 841         req.flags            = flags;
 842
 843         DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
 844         ctdb_packet_dump(&req.hdr);
 845
 846         status = ctdb_packet_send(
 847                 conn->pkt, 2,
 848                 data_blob_const(&req, offsetof(struct ctdb_req_control, data)),
 849                 data_blob_const(data.dptr, data.dsize));
 850
 851         if (!NT_STATUS_IS_OK(status)) {
 852                 DEBUG(3, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
 853                 goto fail;
 854         }
 855
 856         status = ctdb_packet_flush(conn->pkt);
 857
 858         if (!NT_STATUS_IS_OK(status)) {
 859                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 860                 cluster_fatal("cluster dispatch daemon control write error\n");
 861         }
 862
 863         if (flags & CTDB_CTRL_FLAG_NOREPLY) {
 864                 TALLOC_FREE(new_conn);
 865                 if (cstatus) {
 866                         *cstatus = 0;
 867                 }
 868                 return NT_STATUS_OK;
 869         }
 870
 871         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
 872
 873         if (!NT_STATUS_IS_OK(status)) {
 874                 DEBUG(10, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 875                 goto fail;
 876         }
 877
 878         if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
 879                 DEBUG(0, ("received invalid reply\n"));
 880                 goto fail;
 881         }
 882
 883         if (outdata) {
 884                 if (!(outdata->dptr = (uint8 *)talloc_memdup(
 885                               mem_ctx, reply->data, reply->datalen))) {
 886                         TALLOC_FREE(reply);
 887                         return NT_STATUS_NO_MEMORY;
 888                 }
 889                 outdata->dsize = reply->datalen;
 890         }
 891         if (cstatus) {
 892                 (*cstatus) = reply->status;
 893         }
 894
 895         status = NT_STATUS_OK;
 896
 897  fail:
 898         TALLOC_FREE(new_conn);
 899         TALLOC_FREE(reply);
 900         return status;
 901 }
 902
 903 /*
 904  * see if a remote process exists
 905  */
 906 bool ctdbd_process_exists(struct ctdbd_connection *conn, uint32 vnn, pid_t pid)
 907 {
 908         NTSTATUS status;
 909         TDB_DATA data;
 910         int32_t cstatus;
 911
 912         data.dptr = (uint8_t*)&pid;
 913         data.dsize = sizeof(pid);
 914
 915         status = ctdbd_control(conn, vnn, CTDB_CONTROL_PROCESS_EXISTS, 0, 0,
 916                                data, NULL, NULL, &cstatus);
 917         if (!NT_STATUS_IS_OK(status)) {
 918                 DEBUG(0, (__location__ " ctdb_control for process_exists "
 919                           "failed\n"));
 920                 return False;
 921         }
 922
 923         return cstatus == 0;
 924 }
 925
 926 /*
 927  * Get a db path
 928  */
 929 char *ctdbd_dbpath(struct ctdbd_connection *conn,
 930                    TALLOC_CTX *mem_ctx, uint32_t db_id)
 931 {
 932         NTSTATUS status;
 933         TDB_DATA data;
 934         int32_t cstatus;
 935
 936         data.dptr = (uint8_t*)&db_id;
 937         data.dsize = sizeof(db_id);
 938
 939         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 940                                CTDB_CONTROL_GETDBPATH, 0, 0, data,
 941                                mem_ctx, &data, &cstatus);
 942         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
 943                 DEBUG(0,(__location__ " ctdb_control for getdbpath failed\n"));
 944                 return NULL;
 945         }
 946
 947         return (char *)data.dptr;
 948 }
 949
 950 /*
 951  * attach to a ctdb database
 952  */
 953 NTSTATUS ctdbd_db_attach(struct ctdbd_connection *conn,
 954                          const char *name, uint32_t *db_id, int tdb_flags)
 955 {
 956         NTSTATUS status;
 957         TDB_DATA data;
 958         int32_t cstatus;
 959         bool persistent = (tdb_flags & TDB_CLEAR_IF_FIRST) == 0;
 960
 961         data.dptr = (uint8_t*)name;
 962         data.dsize = strlen(name)+1;
 963
 964         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 965                                persistent
 966                                ? CTDB_CONTROL_DB_ATTACH_PERSISTENT
 967                                : CTDB_CONTROL_DB_ATTACH,
 968                                tdb_flags, 0, data, NULL, &data, &cstatus);
 969         if (!NT_STATUS_IS_OK(status)) {
 970                 DEBUG(0, (__location__ " ctdb_control for db_attach "
 971                           "failed: %s\n", nt_errstr(status)));
 972                 return status;
 973         }
 974
 975         if (cstatus != 0 || data.dsize != sizeof(uint32_t)) {
 976                 DEBUG(0,(__location__ " ctdb_control for db_attach failed\n"));
 977                 return NT_STATUS_INTERNAL_ERROR;
 978         }
 979
 980         *db_id = *(uint32_t *)data.dptr;
 981         talloc_free(data.dptr);
 982
 983         if (!(tdb_flags & TDB_SEQNUM)) {
 984                 return NT_STATUS_OK;
 985         }
 986
 987         data.dptr = (uint8_t *)db_id;
 988         data.dsize = sizeof(*db_id);
 989
 990         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 991                                CTDB_CONTROL_ENABLE_SEQNUM, 0, 0, data,
 992                                NULL, NULL, &cstatus);
 993         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
 994                 DEBUG(0,(__location__ " ctdb_control for enable seqnum "
 995                          "failed\n"));
 996                 return NT_STATUS_IS_OK(status) ? NT_STATUS_INTERNAL_ERROR :
 997                         status;
 998         }
 999
1000         return NT_STATUS_OK;
1001 }
1002
1003 /*
1004  * force the migration of a record to this node
1005  */
1006 NTSTATUS ctdbd_migrate(struct ctdbd_connection *conn, uint32 db_id,
1007                        TDB_DATA key)
1008 {
1009         struct ctdb_req_call req;
1010         struct ctdb_reply_call *reply;
1011         NTSTATUS status;
1012
1013         ZERO_STRUCT(req);
1014
1015         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
1016         req.hdr.ctdb_magic   = CTDB_MAGIC;
1017         req.hdr.ctdb_version = CTDB_VERSION;
1018         req.hdr.operation    = CTDB_REQ_CALL;
1019         req.hdr.reqid        = ++conn->reqid;
1020         req.flags            = CTDB_IMMEDIATE_MIGRATION;
1021         req.callid           = CTDB_NULL_FUNC;
1022         req.db_id            = db_id;
1023         req.keylen           = key.dsize;
1024
1025         DEBUG(10, ("ctdbd_migrate: Sending ctdb packet\n"));
1026         ctdb_packet_dump(&req.hdr);
1027
1028         status = ctdb_packet_send(
1029                 conn->pkt, 2,
1030                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
1031                 data_blob_const(key.dptr, key.dsize));
1032
1033         if (!NT_STATUS_IS_OK(status)) {
1034                 DEBUG(3, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
1035                 return status;
1036         }
1037
1038         status = ctdb_packet_flush(conn->pkt);
1039
1040         if (!NT_STATUS_IS_OK(status)) {
1041                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
1042                 cluster_fatal("cluster dispatch daemon control write error\n");
1043         }
1044
1045         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
1046
1047         if (!NT_STATUS_IS_OK(status)) {
1048                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1049                 goto fail;
1050         }
1051
1052         if (reply->hdr.operation != CTDB_REPLY_CALL) {
1053                 DEBUG(0, ("received invalid reply\n"));
1054                 status = NT_STATUS_INTERNAL_ERROR;
1055                 goto fail;
1056         }
1057
1058         status = NT_STATUS_OK;
1059  fail:
1060
1061         TALLOC_FREE(reply);
1062         return status;
1063 }
1064
1065 /*
1066  * remotely fetch a record without locking it or forcing a migration
1067  */
1068 NTSTATUS ctdbd_fetch(struct ctdbd_connection *conn, uint32 db_id,
1069                      TDB_DATA key, TALLOC_CTX *mem_ctx, TDB_DATA *data)
1070 {
1071         struct ctdb_req_call req;
1072         struct ctdb_reply_call *reply;
1073         NTSTATUS status;
1074
1075         ZERO_STRUCT(req);
1076
1077         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
1078         req.hdr.ctdb_magic   = CTDB_MAGIC;
1079         req.hdr.ctdb_version = CTDB_VERSION;
1080         req.hdr.operation    = CTDB_REQ_CALL;
1081         req.hdr.reqid        = ++conn->reqid;
1082         req.flags            = 0;
1083         req.callid           = CTDB_FETCH_FUNC;
1084         req.db_id            = db_id;
1085         req.keylen           = key.dsize;
1086
1087         status = ctdb_packet_send(
1088                 conn->pkt, 2,
1089                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
1090                 data_blob_const(key.dptr, key.dsize));
1091
1092         if (!NT_STATUS_IS_OK(status)) {
1093                 DEBUG(3, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
1094                 return status;
1095         }
1096
1097         status = ctdb_packet_flush(conn->pkt);
1098
1099         if (!NT_STATUS_IS_OK(status)) {
1100                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
1101                 cluster_fatal("cluster dispatch daemon control write error\n");
1102         }
1103
1104         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
1105
1106         if (!NT_STATUS_IS_OK(status)) {
1107                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1108                 goto fail;
1109         }
1110
1111         if (reply->hdr.operation != CTDB_REPLY_CALL) {
1112                 DEBUG(0, ("received invalid reply\n"));
1113                 status = NT_STATUS_INTERNAL_ERROR;
1114                 goto fail;
1115         }
1116
1117         data->dsize = reply->datalen;
1118         if (data->dsize == 0) {
1119                 data->dptr = NULL;
1120                 goto done;
1121         }
1122
1123         data->dptr = (uint8 *)talloc_memdup(mem_ctx, &reply->data[0],
1124                                             reply->datalen);
1125         if (data->dptr == NULL) {
1126                 DEBUG(0, ("talloc failed\n"));
1127                 status = NT_STATUS_NO_MEMORY;
1128                 goto fail;
1129         }
1130
1131  done:
1132         status = NT_STATUS_OK;
1133  fail:
1134         TALLOC_FREE(reply);
1135         return status;
1136 }
1137
1138 struct ctdbd_traverse_state {
1139         void (*fn)(TDB_DATA key, TDB_DATA data, void *private_data);
1140         void *private_data;
1141 };
1142
1143 /*
1144  * Handle a traverse record coming in on the ctdbd connection
1145  */
1146
1147 static NTSTATUS ctdb_traverse_handler(uint8_t *buf, size_t length,
1148                                       void *private_data)
1149 {
1150         struct ctdbd_traverse_state *state =
1151                 (struct ctdbd_traverse_state *)private_data;
1152
1153         struct ctdb_req_message *m;
1154         struct ctdb_rec_data *d;
1155         TDB_DATA key, data;
1156
1157         m = (struct ctdb_req_message *)buf;
1158
1159         if (length < sizeof(*m) || m->hdr.length != length) {
1160                 DEBUG(0, ("Got invalid message of length %d\n", (int)length));
1161                 TALLOC_FREE(buf);
1162                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1163         }
1164
1165         d = (struct ctdb_rec_data *)&m->data[0];
1166         if (m->datalen < sizeof(uint32_t) || m->datalen != d->length) {
1167                 DEBUG(0, ("Got invalid traverse data of length %d\n",
1168                           (int)m->datalen));
1169                 TALLOC_FREE(buf);
1170                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1171         }
1172
1173         key.dsize = d->keylen;
1174         key.dptr  = &d->data[0];
1175         data.dsize = d->datalen;
1176         data.dptr = &d->data[d->keylen];
1177
1178         if (key.dsize == 0 && data.dsize == 0) {
1179                 /* end of traverse */
1180                 return NT_STATUS_END_OF_FILE;
1181         }
1182
1183         if (data.dsize < sizeof(struct ctdb_ltdb_header)) {
1184                 DEBUG(0, ("Got invalid ltdb header length %d\n",
1185                           (int)data.dsize));
1186                 TALLOC_FREE(buf);
1187                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1188         }
1189         data.dsize -= sizeof(struct ctdb_ltdb_header);
1190         data.dptr += sizeof(struct ctdb_ltdb_header);
1191
1192         if (state->fn) {
1193                 state->fn(key, data, state->private_data);
1194         }
1195
1196         TALLOC_FREE(buf);
1197         return NT_STATUS_OK;
1198 }
1199
1200 /*
1201   Traverse a ctdb database. This uses a kind-of hackish way to open a second
1202   connection to ctdbd to avoid the hairy recursive and async problems with
1203   everything in-line.
1204 */
1205
1206 NTSTATUS ctdbd_traverse(uint32 db_id,
1207                         void (*fn)(TDB_DATA key, TDB_DATA data,
1208                                    void *private_data),
1209                         void *private_data)
1210 {
1211         struct ctdbd_connection *conn;
1212         NTSTATUS status;
1213
1214         TDB_DATA data;
1215         struct ctdb_traverse_start t;
1216         int cstatus;
1217         struct ctdbd_traverse_state state;
1218
1219         status = ctdbd_init_connection(NULL, &conn);
1220         if (!NT_STATUS_IS_OK(status)) {
1221                 DEBUG(0, ("ctdbd_init_connection failed: %s\n",
1222                           nt_errstr(status)));
1223                 return status;
1224         }
1225
1226         t.db_id = db_id;
1227         t.srvid = conn->rand_srvid;
1228         t.reqid = ++conn->reqid;
1229
1230         data.dptr = (uint8_t *)&t;
1231         data.dsize = sizeof(t);
1232
1233         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1234                                CTDB_CONTROL_TRAVERSE_START, conn->rand_srvid, 0,
1235                                data, NULL, NULL, &cstatus);
1236
1237         if (!NT_STATUS_IS_OK(status) || (cstatus != 0)) {
1238
1239                 DEBUG(0,("ctdbd_control failed: %s, %d\n", nt_errstr(status),
1240                          cstatus));
1241
1242                 if (NT_STATUS_IS_OK(status)) {
1243                         /*
1244                          * We need a mapping here
1245                          */
1246                         status = NT_STATUS_UNSUCCESSFUL;
1247                 }
1248                 goto done;
1249         }
1250
1251         state.fn = fn;
1252         state.private_data = private_data;
1253
1254         while (True) {
1255
1256                 status = NT_STATUS_OK;
1257
1258                 if (ctdb_packet_handler(conn->pkt, ctdb_req_complete,
1259                                    ctdb_traverse_handler, &state, &status)) {
1260
1261                         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1262                                 status = NT_STATUS_OK;
1263                                 break;
1264                         }
1265
1266                         /*
1267                          * There might be more in the queue
1268                          */
1269                         continue;
1270                 }
1271
1272                 if (!NT_STATUS_IS_OK(status)) {
1273                         break;
1274                 }
1275
1276                 status = ctdb_packet_fd_read_sync(conn->pkt);
1277
1278                 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1279                         /*
1280                          * There might be more in the queue
1281                          */
1282                         continue;
1283                 }
1284
1285                 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1286                         status = NT_STATUS_OK;
1287                         break;
1288                 }
1289
1290                 if (!NT_STATUS_IS_OK(status)) {
1291                         DEBUG(0, ("ctdb_packet_fd_read_sync failed: %s\n", nt_errstr(status)));
1292                         cluster_fatal("ctdbd died\n");
1293                 }
1294         }
1295
1296  done:
1297         TALLOC_FREE(conn);
1298         return status;
1299 }
1300
1301 /*
1302    This is used to canonicalize a ctdb_sock_addr structure.
1303 */
1304 static void smbd_ctdb_canonicalize_ip(const struct sockaddr_storage *in,
1305                                       struct sockaddr_storage *out)
1306 {
1307         memcpy(out, in, sizeof (*out));
1308
1309 #ifdef HAVE_IPV6
1310         if (in->ss_family == AF_INET6) {
1311                 const char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
1312                 const struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)in;
1313                 struct sockaddr_in *out4 = (struct sockaddr_in *)out;
1314                 if (memcmp(&in6->sin6_addr, prefix, 12) == 0) {
1315                         memset(out, 0, sizeof(*out));
1316 #ifdef HAVE_SOCK_SIN_LEN
1317                         out4->sin_len = sizeof(*out);
1318 #endif
1319                         out4->sin_family = AF_INET;
1320                         out4->sin_port   = in6->sin6_port;
1321                         memcpy(&out4->sin_addr, &in6->sin6_addr.s6_addr32[3], 4);
1322                 }
1323         }
1324 #endif
1325 }
1326
1327 /*
1328  * Register us as a server for a particular tcp connection
1329  */
1330
1331 NTSTATUS ctdbd_register_ips(struct ctdbd_connection *conn,
1332                             const struct sockaddr_storage *_server,
1333                             const struct sockaddr_storage *_client,
1334                             void (*release_ip_handler)(const char *ip_addr,
1335                                                        void *private_data),
1336                             void *private_data)
1337 {
1338         /*
1339          * we still use ctdb_control_tcp for ipv4
1340          * because we want to work against older ctdb
1341          * versions at runtime
1342          */
1343         struct ctdb_control_tcp p4;
1344 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1345         struct ctdb_control_tcp_addr p;
1346 #endif
1347         TDB_DATA data;
1348         NTSTATUS status;
1349         struct sockaddr_storage client;
1350         struct sockaddr_storage server;
1351
1352         /*
1353          * Only one connection so far
1354          */
1355         SMB_ASSERT(conn->release_ip_handler == NULL);
1356
1357         smbd_ctdb_canonicalize_ip(_client, &client);
1358         smbd_ctdb_canonicalize_ip(_server, &server);
1359
1360         switch (client.ss_family) {
1361         case AF_INET:
1362                 p4.dest = *(struct sockaddr_in *)(void *)&server;
1363                 p4.src = *(struct sockaddr_in *)(void *)&client;
1364                 data.dptr = (uint8_t *)&p4;
1365                 data.dsize = sizeof(p4);
1366                 break;
1367 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1368         case AF_INET6:
1369                 p.dest.ip6 = *(struct sockaddr_in6 *)(void *)&server;
1370                 p.src.ip6 = *(struct sockaddr_in6 *)(void *)&client;
1371                 data.dptr = (uint8_t *)&p;
1372                 data.dsize = sizeof(p);
1373                 break;
1374 #endif
1375         default:
1376                 return NT_STATUS_INTERNAL_ERROR;
1377         }
1378
1379         conn->release_ip_handler = release_ip_handler;
1380         conn->release_ip_priv = private_data;
1381
1382         /*
1383          * We want to be told about IP releases
1384          */
1385
1386         status = register_with_ctdbd(conn, CTDB_SRVID_RELEASE_IP);
1387         if (!NT_STATUS_IS_OK(status)) {
1388                 return status;
1389         }
1390
1391         /*
1392          * inform ctdb of our tcp connection, so if IP takeover happens ctdb
1393          * can send an extra ack to trigger a reset for our client, so it
1394          * immediately reconnects
1395          */
1396         return ctdbd_control(conn, CTDB_CURRENT_NODE,
1397                              CTDB_CONTROL_TCP_CLIENT, 0,
1398                              CTDB_CTRL_FLAG_NOREPLY, data, NULL, NULL, NULL);
1399 }
1400
1401 /*
1402  * We want to handle reconfigure events
1403  */
1404 NTSTATUS ctdbd_register_reconfigure(struct ctdbd_connection *conn)
1405 {
1406         return register_with_ctdbd(conn, CTDB_SRVID_RECONFIGURE);
1407 }
1408
1409 /*
1410   call a control on the local node
1411  */
1412 NTSTATUS ctdbd_control_local(struct ctdbd_connection *conn, uint32 opcode,
1413                              uint64_t srvid, uint32_t flags, TDB_DATA data,
1414                              TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
1415                              int *cstatus)
1416 {
1417         return ctdbd_control(conn, CTDB_CURRENT_NODE, opcode, srvid, flags, data, mem_ctx, outdata, cstatus);
1418 }
1419
1420 NTSTATUS ctdb_watch_us(struct ctdbd_connection *conn)
1421 {
1422         struct ctdb_client_notify_register reg_data;
1423         size_t struct_len;
1424         NTSTATUS status;
1425         int cstatus;
1426
1427         reg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1428         reg_data.len = 1;
1429         reg_data.notify_data[0] = 0;
1430
1431         struct_len = offsetof(struct ctdb_client_notify_register,
1432                               notify_data) + reg_data.len;
1433
1434         status = ctdbd_control_local(
1435                 conn, CTDB_CONTROL_REGISTER_NOTIFY, conn->rand_srvid, 0,
1436                 make_tdb_data((uint8_t *)&reg_data, struct_len),
1437                 NULL, NULL, &cstatus);
1438         if (!NT_STATUS_IS_OK(status)) {
1439                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1440                           nt_errstr(status)));
1441         }
1442         return status;
1443 }
1444
1445 NTSTATUS ctdb_unwatch(struct ctdbd_connection *conn)
1446 {
1447         struct ctdb_client_notify_deregister dereg_data;
1448         NTSTATUS status;
1449         int cstatus;
1450
1451         dereg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1452
1453         status = ctdbd_control_local(
1454                 conn, CTDB_CONTROL_DEREGISTER_NOTIFY, conn->rand_srvid, 0,
1455                 make_tdb_data((uint8_t *)&dereg_data, sizeof(dereg_data)),
1456                 NULL, NULL, &cstatus);
1457         if (!NT_STATUS_IS_OK(status)) {
1458                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1459                           nt_errstr(status)));
1460         }
1461         return status;
1462 }
1463
1464 #endif