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 /* paths to these include files come from --with-ctdb= in configure */
  31 #include "ctdb.h"
  32 #include "ctdb_private.h"
  33
  34 struct ctdbd_connection {
  35         struct messaging_context *msg_ctx;
  36         uint32 reqid;
  37         uint32 our_vnn;
  38         uint64 rand_srvid;
  39         struct ctdb_packet_context *pkt;
  40         struct fd_event *fde;
  41
  42         void (*release_ip_handler)(const char *ip_addr, void *private_data);
  43         void *release_ip_priv;
  44 };
  45
  46 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
  47                               uint32_t vnn, uint32 opcode,
  48                               uint64_t srvid, uint32_t flags, TDB_DATA data,
  49                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
  50                               int *cstatus);
  51
  52 /*
  53  * exit on fatal communications errors with the ctdbd daemon
  54  */
  55 static void cluster_fatal(const char *why)
  56 {
  57         DEBUG(0,("cluster fatal event: %s - exiting immediately\n", why));
  58         /* we don't use smb_panic() as we don't want to delay to write
  59            a core file. We need to release this process id immediately
  60            so that someone else can take over without getting sharing
  61            violations */
  62         _exit(1);
  63 }
  64
  65 /*
  66  *
  67  */
  68 static void ctdb_packet_dump(struct ctdb_req_header *hdr)
  69 {
  70         if (DEBUGLEVEL < 10) {
  71                 return;
  72         }
  73         DEBUGADD(10, ("len=%d, magic=%x, vers=%d, gen=%d, op=%d, reqid=%d\n",
  74                       (int)hdr->length, (int)hdr->ctdb_magic,
  75                       (int)hdr->ctdb_version, (int)hdr->generation,
  76                       (int)hdr->operation, (int)hdr->reqid));
  77 }
  78
  79 /*
  80  * Register a srvid with ctdbd
  81  */
  82 static NTSTATUS register_with_ctdbd(struct ctdbd_connection *conn,
  83                                     uint64_t srvid)
  84 {
  85
  86         int cstatus;
  87         return ctdbd_control(conn, CTDB_CURRENT_NODE,
  88                              CTDB_CONTROL_REGISTER_SRVID, srvid, 0,
  89                              tdb_null, NULL, NULL, &cstatus);
  90 }
  91
  92 /*
  93  * get our vnn from the cluster
  94  */
  95 static NTSTATUS get_cluster_vnn(struct ctdbd_connection *conn, uint32 *vnn)
  96 {
  97         int32_t cstatus=-1;
  98         NTSTATUS status;
  99         status = ctdbd_control(conn,
 100                                CTDB_CURRENT_NODE, CTDB_CONTROL_GET_PNN, 0, 0,
 101                                tdb_null, NULL, NULL, &cstatus);
 102         if (!NT_STATUS_IS_OK(status)) {
 103                 cluster_fatal("ctdbd_control failed\n");
 104         }
 105         *vnn = (uint32_t)cstatus;
 106         return status;
 107 }
 108
 109 /*
 110  * Are we active (i.e. not banned or stopped?)
 111  */
 112 static bool ctdbd_working(struct ctdbd_connection *conn, uint32_t vnn)
 113 {
 114         int32_t cstatus=-1;
 115         NTSTATUS status;
 116         TDB_DATA outdata;
 117         struct ctdb_node_map *m;
 118         uint32_t failure_flags;
 119         bool ret = false;
 120         int i;
 121
 122         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 123                                CTDB_CONTROL_GET_NODEMAP, 0, 0,
 124                                tdb_null, talloc_tos(), &outdata, &cstatus);
 125         if (!NT_STATUS_IS_OK(status)) {
 126                 cluster_fatal("ctdbd_control failed\n");
 127         }
 128         if ((cstatus != 0) || (outdata.dptr == NULL)) {
 129                 DEBUG(2, ("Received invalid ctdb data\n"));
 130                 return false;
 131         }
 132
 133         m = (struct ctdb_node_map *)outdata.dptr;
 134
 135         for (i=0; i<m->num; i++) {
 136                 if (vnn == m->nodes[i].pnn) {
 137                         break;
 138                 }
 139         }
 140
 141         if (i == m->num) {
 142                 DEBUG(2, ("Did not find ourselves (node %d) in nodemap\n",
 143                           (int)vnn));
 144                 goto fail;
 145         }
 146
 147         failure_flags = NODE_FLAGS_BANNED | NODE_FLAGS_DISCONNECTED
 148                 | NODE_FLAGS_PERMANENTLY_DISABLED | NODE_FLAGS_STOPPED;
 149
 150         if ((m->nodes[i].flags & failure_flags) != 0) {
 151                 DEBUG(2, ("Node has status %x, not active\n",
 152                           (int)m->nodes[i].flags));
 153                 goto fail;
 154         }
 155
 156         ret = true;
 157 fail:
 158         TALLOC_FREE(outdata.dptr);
 159         return ret;
 160 }
 161
 162 uint32 ctdbd_vnn(const struct ctdbd_connection *conn)
 163 {
 164         return conn->our_vnn;
 165 }
 166
 167 /*
 168  * Get us a ctdb connection
 169  */
 170
 171 static NTSTATUS ctdbd_connect(TALLOC_CTX *mem_ctx,
 172                               struct ctdb_packet_context **presult)
 173 {
 174         struct ctdb_packet_context *result;
 175         const char *sockname = lp_ctdbd_socket();
 176         struct sockaddr_un addr;
 177         int fd;
 178
 179         if (!sockname || !*sockname) {
 180                 sockname = CTDB_PATH;
 181         }
 182
 183         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 184         if (fd == -1) {
 185                 DEBUG(3, ("Could not create socket: %s\n", strerror(errno)));
 186                 return map_nt_error_from_unix(errno);
 187         }
 188
 189         ZERO_STRUCT(addr);
 190         addr.sun_family = AF_UNIX;
 191         strncpy(addr.sun_path, sockname, sizeof(addr.sun_path));
 192
 193         if (sys_connect(fd, (struct sockaddr *)(void *)&addr) == -1) {
 194                 DEBUG(1, ("connect(%s) failed: %s\n", sockname,
 195                           strerror(errno)));
 196                 close(fd);
 197                 return map_nt_error_from_unix(errno);
 198         }
 199
 200         if (!(result = ctdb_packet_init(mem_ctx, fd))) {
 201                 close(fd);
 202                 return NT_STATUS_NO_MEMORY;
 203         }
 204
 205         *presult = result;
 206         return NT_STATUS_OK;
 207 }
 208
 209 /*
 210  * Do we have a complete ctdb packet in the queue?
 211  */
 212
 213 static bool ctdb_req_complete(const uint8_t *buf, size_t available,
 214                               size_t *length,
 215                               void *private_data)
 216 {
 217         uint32 msglen;
 218
 219         if (available < sizeof(msglen)) {
 220                 return False;
 221         }
 222
 223         msglen = *((uint32 *)buf);
 224
 225         DEBUG(10, ("msglen = %d\n", msglen));
 226
 227         if (msglen < sizeof(struct ctdb_req_header)) {
 228                 DEBUG(0, ("Got invalid msglen: %d, expected at least %d for "
 229                           "the req_header\n", (int)msglen,
 230                           (int)sizeof(struct ctdb_req_header)));
 231                 cluster_fatal("ctdbd protocol error\n");
 232         }
 233
 234         if (available < msglen) {
 235                 return false;
 236         }
 237
 238         *length = msglen;
 239         return true;
 240 }
 241
 242 /*
 243  * State necessary to defer an incoming message while we are waiting for a
 244  * ctdb reply.
 245  */
 246
 247 struct deferred_msg_state {
 248         struct messaging_context *msg_ctx;
 249         struct messaging_rec *rec;
 250 };
 251
 252 /*
 253  * Timed event handler for the deferred message
 254  */
 255
 256 static void deferred_message_dispatch(struct event_context *event_ctx,
 257                                       struct timed_event *te,
 258                                       struct timeval now,
 259                                       void *private_data)
 260 {
 261         struct deferred_msg_state *state = talloc_get_type_abort(
 262                 private_data, struct deferred_msg_state);
 263
 264         messaging_dispatch_rec(state->msg_ctx, state->rec);
 265         TALLOC_FREE(state);
 266         TALLOC_FREE(te);
 267 }
 268
 269 struct req_pull_state {
 270         TALLOC_CTX *mem_ctx;
 271         DATA_BLOB req;
 272 };
 273
 274 /*
 275  * Pull a ctdb request out of the incoming ctdb_packet queue
 276  */
 277
 278 static NTSTATUS ctdb_req_pull(uint8_t *buf, size_t length,
 279                               void *private_data)
 280 {
 281         struct req_pull_state *state = (struct req_pull_state *)private_data;
 282
 283         state->req.data = talloc_move(state->mem_ctx, &buf);
 284         state->req.length = length;
 285         return NT_STATUS_OK;
 286 }
 287
 288 /*
 289  * Fetch a messaging_rec from an incoming ctdb style message
 290  */
 291
 292 static struct messaging_rec *ctdb_pull_messaging_rec(TALLOC_CTX *mem_ctx,
 293                                                      size_t overall_length,
 294                                                      struct ctdb_req_message *msg)
 295 {
 296         struct messaging_rec *result;
 297         DATA_BLOB blob;
 298         enum ndr_err_code ndr_err;
 299
 300         if ((overall_length < offsetof(struct ctdb_req_message, data))
 301             || (overall_length
 302                 < offsetof(struct ctdb_req_message, data) + msg->datalen)) {
 303
 304                 cluster_fatal("got invalid msg length");
 305         }
 306
 307         if (!(result = talloc(mem_ctx, struct messaging_rec))) {
 308                 DEBUG(0, ("talloc failed\n"));
 309                 return NULL;
 310         }
 311
 312         blob = data_blob_const(msg->data, msg->datalen);
 313
 314         ndr_err = ndr_pull_struct_blob(
 315                 &blob, result, result,
 316                 (ndr_pull_flags_fn_t)ndr_pull_messaging_rec);
 317
 318         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 319                 DEBUG(0, ("ndr_pull_struct_blob failed: %s\n",
 320                           ndr_errstr(ndr_err)));
 321                 TALLOC_FREE(result);
 322                 return NULL;
 323         }
 324
 325         if (DEBUGLEVEL >= 10) {
 326                 DEBUG(10, ("ctdb_pull_messaging_rec:\n"));
 327                 NDR_PRINT_DEBUG(messaging_rec, result);
 328         }
 329
 330         return result;
 331 }
 332
 333 static NTSTATUS ctdb_packet_fd_read_sync(struct ctdb_packet_context *ctx)
 334 {
 335         int timeout = lp_ctdb_timeout();
 336
 337         if (timeout == 0) {
 338                 timeout = -1;
 339         }
 340         return ctdb_packet_fd_read_sync_timeout(ctx, timeout);
 341 }
 342
 343 /*
 344  * Read a full ctdbd request. If we have a messaging context, defer incoming
 345  * messages that might come in between.
 346  */
 347
 348 static NTSTATUS ctdb_read_req(struct ctdbd_connection *conn, uint32 reqid,
 349                               TALLOC_CTX *mem_ctx, void *result)
 350 {
 351         struct ctdb_req_header *hdr;
 352         struct req_pull_state state;
 353         NTSTATUS status;
 354
 355  again:
 356
 357         status = ctdb_packet_fd_read_sync(conn->pkt);
 358
 359         if (NT_STATUS_EQUAL(status, NT_STATUS_NETWORK_BUSY)) {
 360                 /* EAGAIN */
 361                 goto again;
 362         } else if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
 363                 /* EAGAIN */
 364                 goto again;
 365         }
 366
 367         if (!NT_STATUS_IS_OK(status)) {
 368                 DEBUG(0, ("ctdb_packet_fd_read failed: %s\n", nt_errstr(status)));
 369                 cluster_fatal("ctdbd died\n");
 370         }
 371
 372  next_pkt:
 373
 374         ZERO_STRUCT(state);
 375         state.mem_ctx = mem_ctx;
 376
 377         if (!ctdb_packet_handler(conn->pkt, ctdb_req_complete, ctdb_req_pull,
 378                             &state, &status)) {
 379                 /*
 380                  * Not enough data
 381                  */
 382                 DEBUG(10, ("not enough data from ctdb socket, retrying\n"));
 383                 goto again;
 384         }
 385
 386         if (!NT_STATUS_IS_OK(status)) {
 387                 DEBUG(0, ("Could not read ctdb_packet: %s\n", nt_errstr(status)));
 388                 cluster_fatal("ctdbd died\n");
 389         }
 390
 391         hdr = (struct ctdb_req_header *)state.req.data;
 392
 393         DEBUG(10, ("Received ctdb packet\n"));
 394         ctdb_packet_dump(hdr);
 395
 396         if (hdr->operation == CTDB_REQ_MESSAGE) {
 397                 struct timed_event *evt;
 398                 struct deferred_msg_state *msg_state;
 399                 struct ctdb_req_message *msg = (struct ctdb_req_message *)hdr;
 400
 401                 if (conn->msg_ctx == NULL) {
 402                         DEBUG(1, ("Got a message without having a msg ctx, "
 403                                   "dropping msg %llu\n",
 404                                   (long long unsigned)msg->srvid));
 405                         goto next_pkt;
 406                 }
 407
 408                 if ((conn->release_ip_handler != NULL)
 409                     && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 410                         /* must be dispatched immediately */
 411                         DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 412                         conn->release_ip_handler((const char *)msg->data,
 413                                                  conn->release_ip_priv);
 414                         TALLOC_FREE(hdr);
 415                         goto next_pkt;
 416                 }
 417
 418                 if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 419                     || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)) {
 420
 421                         DEBUG(1, ("ctdb_read_req: Got %s message\n",
 422                                   (msg->srvid == CTDB_SRVID_RECONFIGURE)
 423                                   ? "cluster reconfigure" : "SAMBA_NOTIFY"));
 424
 425                         messaging_send(conn->msg_ctx,
 426                                        messaging_server_id(conn->msg_ctx),
 427                                        MSG_SMB_BRL_VALIDATE, &data_blob_null);
 428                         messaging_send(conn->msg_ctx,
 429                                        messaging_server_id(conn->msg_ctx),
 430                                        MSG_DBWRAP_G_LOCK_RETRY,
 431                                        &data_blob_null);
 432                         TALLOC_FREE(hdr);
 433                         goto next_pkt;
 434                 }
 435
 436                 msg_state = talloc(NULL, struct deferred_msg_state);
 437                 if (msg_state == NULL) {
 438                         DEBUG(0, ("talloc failed\n"));
 439                         TALLOC_FREE(hdr);
 440                         goto next_pkt;
 441                 }
 442
 443                 if (!(msg_state->rec = ctdb_pull_messaging_rec(
 444                               msg_state, state.req.length, msg))) {
 445                         DEBUG(0, ("ctdbd_pull_messaging_rec failed\n"));
 446                         TALLOC_FREE(msg_state);
 447                         TALLOC_FREE(hdr);
 448                         goto next_pkt;
 449                 }
 450
 451                 TALLOC_FREE(hdr);
 452
 453                 msg_state->msg_ctx = conn->msg_ctx;
 454
 455                 /*
 456                  * We're waiting for a call reply, but an async message has
 457                  * crossed. Defer dispatching to the toplevel event loop.
 458                  */
 459                 evt = event_add_timed(conn->msg_ctx->event_ctx,
 460                                       conn->msg_ctx->event_ctx,
 461                                       timeval_zero(),
 462                                       deferred_message_dispatch,
 463                                       msg_state);
 464                 if (evt == NULL) {
 465                         DEBUG(0, ("event_add_timed failed\n"));
 466                         TALLOC_FREE(msg_state);
 467                         TALLOC_FREE(hdr);
 468                         goto next_pkt;
 469                 }
 470
 471                 goto next_pkt;
 472         }
 473
 474         if (hdr->reqid != reqid) {
 475                 /* we got the wrong reply */
 476                 DEBUG(0,("Discarding mismatched ctdb reqid %u should have "
 477                          "been %u\n", hdr->reqid, reqid));
 478                 TALLOC_FREE(hdr);
 479                 goto again;
 480         }
 481
 482         *((void **)result) = talloc_move(mem_ctx, &hdr);
 483
 484         return NT_STATUS_OK;
 485 }
 486
 487 /*
 488  * Get us a ctdbd connection
 489  */
 490
 491 static NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
 492                                       struct ctdbd_connection **pconn)
 493 {
 494         struct ctdbd_connection *conn;
 495         NTSTATUS status;
 496
 497         if (!(conn = TALLOC_ZERO_P(mem_ctx, struct ctdbd_connection))) {
 498                 DEBUG(0, ("talloc failed\n"));
 499                 return NT_STATUS_NO_MEMORY;
 500         }
 501
 502         status = ctdbd_connect(conn, &conn->pkt);
 503
 504         if (!NT_STATUS_IS_OK(status)) {
 505                 DEBUG(10, ("ctdbd_connect failed: %s\n", nt_errstr(status)));
 506                 goto fail;
 507         }
 508
 509         status = get_cluster_vnn(conn, &conn->our_vnn);
 510
 511         if (!NT_STATUS_IS_OK(status)) {
 512                 DEBUG(10, ("get_cluster_vnn failed: %s\n", nt_errstr(status)));
 513                 goto fail;
 514         }
 515
 516         if (!ctdbd_working(conn, conn->our_vnn)) {
 517                 DEBUG(2, ("Node is not working, can not connect\n"));
 518                 status = NT_STATUS_INTERNAL_DB_ERROR;
 519                 goto fail;
 520         }
 521
 522         generate_random_buffer((unsigned char *)&conn->rand_srvid,
 523                                sizeof(conn->rand_srvid));
 524
 525         status = register_with_ctdbd(conn, conn->rand_srvid);
 526
 527         if (!NT_STATUS_IS_OK(status)) {
 528                 DEBUG(5, ("Could not register random srvid: %s\n",
 529                           nt_errstr(status)));
 530                 goto fail;
 531         }
 532
 533         *pconn = conn;
 534         return NT_STATUS_OK;
 535
 536  fail:
 537         TALLOC_FREE(conn);
 538         return status;
 539 }
 540
 541 /*
 542  * Get us a ctdbd connection and register us as a process
 543  */
 544
 545 NTSTATUS ctdbd_messaging_connection(TALLOC_CTX *mem_ctx,
 546                                     struct ctdbd_connection **pconn)
 547 {
 548         struct ctdbd_connection *conn;
 549         NTSTATUS status;
 550
 551         status = ctdbd_init_connection(mem_ctx, &conn);
 552
 553         if (!NT_STATUS_IS_OK(status)) {
 554                 return status;
 555         }
 556
 557         status = register_with_ctdbd(conn, (uint64_t)sys_getpid());
 558         if (!NT_STATUS_IS_OK(status)) {
 559                 goto fail;
 560         }
 561
 562         status = register_with_ctdbd(conn, MSG_SRVID_SAMBA);
 563         if (!NT_STATUS_IS_OK(status)) {
 564                 goto fail;
 565         }
 566
 567         status = register_with_ctdbd(conn, CTDB_SRVID_SAMBA_NOTIFY);
 568         if (!NT_STATUS_IS_OK(status)) {
 569                 goto fail;
 570         }
 571
 572         *pconn = conn;
 573         return NT_STATUS_OK;
 574
 575  fail:
 576         TALLOC_FREE(conn);
 577         return status;
 578 }
 579
 580 struct messaging_context *ctdb_conn_msg_ctx(struct ctdbd_connection *conn)
 581 {
 582         return conn->msg_ctx;
 583 }
 584
 585 int ctdbd_conn_get_fd(struct ctdbd_connection *conn)
 586 {
 587         return ctdb_packet_get_fd(conn->pkt);
 588 }
 589
 590 /*
 591  * Packet handler to receive and handle a ctdb message
 592  */
 593 static NTSTATUS ctdb_handle_message(uint8_t *buf, size_t length,
 594                                     void *private_data)
 595 {
 596         struct ctdbd_connection *conn = talloc_get_type_abort(
 597                 private_data, struct ctdbd_connection);
 598         struct ctdb_req_message *msg;
 599         struct messaging_rec *msg_rec;
 600
 601         msg = (struct ctdb_req_message *)buf;
 602
 603         if (msg->hdr.operation != CTDB_REQ_MESSAGE) {
 604                 DEBUG(0, ("Received async msg of type %u, discarding\n",
 605                           msg->hdr.operation));
 606                 TALLOC_FREE(buf);
 607                 return NT_STATUS_INVALID_PARAMETER;
 608         }
 609
 610         if ((conn->release_ip_handler != NULL)
 611             && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 612                 /* must be dispatched immediately */
 613                 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 614                 conn->release_ip_handler((const char *)msg->data,
 615                                          conn->release_ip_priv);
 616                 TALLOC_FREE(buf);
 617                 return NT_STATUS_OK;
 618         }
 619
 620         SMB_ASSERT(conn->msg_ctx != NULL);
 621
 622         if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 623             || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)){
 624                 DEBUG(0,("Got cluster reconfigure message\n"));
 625                 /*
 626                  * when the cluster is reconfigured or someone of the
 627                  * family has passed away (SAMBA_NOTIFY), we need to
 628                  * clean the brl database
 629                  */
 630                 messaging_send(conn->msg_ctx,
 631                                messaging_server_id(conn->msg_ctx),
 632                                MSG_SMB_BRL_VALIDATE, &data_blob_null);
 633
 634                 messaging_send(conn->msg_ctx,
 635                                messaging_server_id(conn->msg_ctx),
 636                                MSG_DBWRAP_G_LOCK_RETRY,
 637                                &data_blob_null);
 638
 639                 TALLOC_FREE(buf);
 640                 return NT_STATUS_OK;
 641         }
 642
 643         /* only messages to our pid or the broadcast are valid here */
 644         if (msg->srvid != sys_getpid() && msg->srvid != MSG_SRVID_SAMBA) {
 645                 DEBUG(0,("Got unexpected message with srvid=%llu\n",
 646                          (unsigned long long)msg->srvid));
 647                 TALLOC_FREE(buf);
 648                 return NT_STATUS_OK;
 649         }
 650
 651         if (!(msg_rec = ctdb_pull_messaging_rec(NULL, length, msg))) {
 652                 DEBUG(10, ("ctdb_pull_messaging_rec failed\n"));
 653                 TALLOC_FREE(buf);
 654                 return NT_STATUS_NO_MEMORY;
 655         }
 656
 657         messaging_dispatch_rec(conn->msg_ctx, msg_rec);
 658
 659         TALLOC_FREE(msg_rec);
 660         TALLOC_FREE(buf);
 661         return NT_STATUS_OK;
 662 }
 663
 664 /*
 665  * The ctdbd socket is readable asynchronuously
 666  */
 667
 668 static void ctdbd_socket_handler(struct event_context *event_ctx,
 669                                  struct fd_event *event,
 670                                  uint16 flags,
 671                                  void *private_data)
 672 {
 673         struct ctdbd_connection *conn = talloc_get_type_abort(
 674                 private_data, struct ctdbd_connection);
 675
 676         NTSTATUS status;
 677
 678         status = ctdb_packet_fd_read(conn->pkt);
 679
 680         if (!NT_STATUS_IS_OK(status)) {
 681                 DEBUG(0, ("packet_fd_read failed: %s\n", nt_errstr(status)));
 682                 cluster_fatal("ctdbd died\n");
 683         }
 684
 685         while (ctdb_packet_handler(conn->pkt, ctdb_req_complete,
 686                               ctdb_handle_message, conn, &status)) {
 687                 if (!NT_STATUS_IS_OK(status)) {
 688                         DEBUG(10, ("could not handle incoming message: %s\n",
 689                                    nt_errstr(status)));
 690                 }
 691         }
 692 }
 693
 694 /*
 695  * Prepare a ctdbd connection to receive messages
 696  */
 697
 698 NTSTATUS ctdbd_register_msg_ctx(struct ctdbd_connection *conn,
 699                                 struct messaging_context *msg_ctx)
 700 {
 701         SMB_ASSERT(conn->msg_ctx == NULL);
 702         SMB_ASSERT(conn->fde == NULL);
 703
 704         if (!(conn->fde = event_add_fd(msg_ctx->event_ctx, conn,
 705                                        ctdb_packet_get_fd(conn->pkt),
 706                                        EVENT_FD_READ,
 707                                        ctdbd_socket_handler,
 708                                        conn))) {
 709                 DEBUG(0, ("event_add_fd failed\n"));
 710                 return NT_STATUS_NO_MEMORY;
 711         }
 712
 713         conn->msg_ctx = msg_ctx;
 714
 715         return NT_STATUS_OK;
 716 }
 717
 718 /*
 719  * Send a messaging message across a ctdbd
 720  */
 721
 722 NTSTATUS ctdbd_messaging_send(struct ctdbd_connection *conn,
 723                               uint32 dst_vnn, uint64 dst_srvid,
 724                               struct messaging_rec *msg)
 725 {
 726         struct ctdb_req_message r;
 727         TALLOC_CTX *mem_ctx;
 728         DATA_BLOB blob;
 729         NTSTATUS status;
 730         enum ndr_err_code ndr_err;
 731
 732         if (!(mem_ctx = talloc_init("ctdbd_messaging_send"))) {
 733                 DEBUG(0, ("talloc failed\n"));
 734                 return NT_STATUS_NO_MEMORY;
 735         }
 736
 737         ndr_err = ndr_push_struct_blob(
 738                 &blob, mem_ctx, msg,
 739                 (ndr_push_flags_fn_t)ndr_push_messaging_rec);
 740
 741         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 742                 DEBUG(0, ("ndr_push_struct_blob failed: %s\n",
 743                           ndr_errstr(ndr_err)));
 744                 status = ndr_map_error2ntstatus(ndr_err);
 745                 goto fail;
 746         }
 747
 748         r.hdr.length = offsetof(struct ctdb_req_message, data) + blob.length;
 749         r.hdr.ctdb_magic = CTDB_MAGIC;
 750         r.hdr.ctdb_version = CTDB_VERSION;
 751         r.hdr.generation = 1;
 752         r.hdr.operation  = CTDB_REQ_MESSAGE;
 753         r.hdr.destnode   = dst_vnn;
 754         r.hdr.srcnode    = conn->our_vnn;
 755         r.hdr.reqid      = 0;
 756         r.srvid          = dst_srvid;
 757         r.datalen        = blob.length;
 758
 759         DEBUG(10, ("ctdbd_messaging_send: Sending ctdb packet\n"));
 760         ctdb_packet_dump(&r.hdr);
 761
 762         status = ctdb_packet_send(
 763                 conn->pkt, 2,
 764                 data_blob_const(&r, offsetof(struct ctdb_req_message, data)),
 765                 blob);
 766
 767         if (!NT_STATUS_IS_OK(status)) {
 768                 DEBUG(0, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
 769                 goto fail;
 770         }
 771
 772         status = ctdb_packet_flush(conn->pkt);
 773
 774         if (!NT_STATUS_IS_OK(status)) {
 775                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 776                 cluster_fatal("cluster dispatch daemon msg write error\n");
 777         }
 778
 779         status = NT_STATUS_OK;
 780  fail:
 781         TALLOC_FREE(mem_ctx);
 782         return status;
 783 }
 784
 785 /*
 786  * send/recv a generic ctdb control message
 787  */
 788 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
 789                               uint32_t vnn, uint32 opcode,
 790                               uint64_t srvid, uint32_t flags,
 791                               TDB_DATA data,
 792                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
 793                               int *cstatus)
 794 {
 795         struct ctdb_req_control req;
 796         struct ctdb_reply_control *reply = NULL;
 797         struct ctdbd_connection *new_conn = NULL;
 798         NTSTATUS status;
 799
 800         if (conn == NULL) {
 801                 status = ctdbd_init_connection(NULL, &new_conn);
 802
 803                 if (!NT_STATUS_IS_OK(status)) {
 804                         DEBUG(10, ("Could not init temp connection: %s\n",
 805                                    nt_errstr(status)));
 806                         goto fail;
 807                 }
 808
 809                 conn = new_conn;
 810         }
 811
 812         ZERO_STRUCT(req);
 813         req.hdr.length = offsetof(struct ctdb_req_control, data) + data.dsize;
 814         req.hdr.ctdb_magic   = CTDB_MAGIC;
 815         req.hdr.ctdb_version = CTDB_VERSION;
 816         req.hdr.operation    = CTDB_REQ_CONTROL;
 817         req.hdr.reqid        = ++conn->reqid;
 818         req.hdr.destnode     = vnn;
 819         req.opcode           = opcode;
 820         req.srvid            = srvid;
 821         req.datalen          = data.dsize;
 822         req.flags            = flags;
 823
 824         DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
 825         ctdb_packet_dump(&req.hdr);
 826
 827         status = ctdb_packet_send(
 828                 conn->pkt, 2,
 829                 data_blob_const(&req, offsetof(struct ctdb_req_control, data)),
 830                 data_blob_const(data.dptr, data.dsize));
 831
 832         if (!NT_STATUS_IS_OK(status)) {
 833                 DEBUG(3, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
 834                 goto fail;
 835         }
 836
 837         status = ctdb_packet_flush(conn->pkt);
 838
 839         if (!NT_STATUS_IS_OK(status)) {
 840                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
 841                 cluster_fatal("cluster dispatch daemon control write error\n");
 842         }
 843
 844         if (flags & CTDB_CTRL_FLAG_NOREPLY) {
 845                 TALLOC_FREE(new_conn);
 846                 if (cstatus) {
 847                         *cstatus = 0;
 848                 }
 849                 return NT_STATUS_OK;
 850         }
 851
 852         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
 853
 854         if (!NT_STATUS_IS_OK(status)) {
 855                 DEBUG(10, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 856                 goto fail;
 857         }
 858
 859         if (reply->hdr.operation != CTDB_REPLY_CONTROL) {
 860                 DEBUG(0, ("received invalid reply\n"));
 861                 goto fail;
 862         }
 863
 864         if (outdata) {
 865                 if (!(outdata->dptr = (uint8 *)talloc_memdup(
 866                               mem_ctx, reply->data, reply->datalen))) {
 867                         TALLOC_FREE(reply);
 868                         return NT_STATUS_NO_MEMORY;
 869                 }
 870                 outdata->dsize = reply->datalen;
 871         }
 872         if (cstatus) {
 873                 (*cstatus) = reply->status;
 874         }
 875
 876         status = NT_STATUS_OK;
 877
 878  fail:
 879         TALLOC_FREE(new_conn);
 880         TALLOC_FREE(reply);
 881         return status;
 882 }
 883
 884 /*
 885  * see if a remote process exists
 886  */
 887 bool ctdbd_process_exists(struct ctdbd_connection *conn, uint32 vnn, pid_t pid)
 888 {
 889         NTSTATUS status;
 890         TDB_DATA data;
 891         int32_t cstatus;
 892
 893         data.dptr = (uint8_t*)&pid;
 894         data.dsize = sizeof(pid);
 895
 896         status = ctdbd_control(conn, vnn, CTDB_CONTROL_PROCESS_EXISTS, 0, 0,
 897                                data, NULL, NULL, &cstatus);
 898         if (!NT_STATUS_IS_OK(status)) {
 899                 DEBUG(0, (__location__ " ctdb_control for process_exists "
 900                           "failed\n"));
 901                 return False;
 902         }
 903
 904         return cstatus == 0;
 905 }
 906
 907 /*
 908  * Get a db path
 909  */
 910 char *ctdbd_dbpath(struct ctdbd_connection *conn,
 911                    TALLOC_CTX *mem_ctx, uint32_t db_id)
 912 {
 913         NTSTATUS status;
 914         TDB_DATA data;
 915         int32_t cstatus;
 916
 917         data.dptr = (uint8_t*)&db_id;
 918         data.dsize = sizeof(db_id);
 919
 920         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 921                                CTDB_CONTROL_GETDBPATH, 0, 0, data,
 922                                mem_ctx, &data, &cstatus);
 923         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
 924                 DEBUG(0,(__location__ " ctdb_control for getdbpath failed\n"));
 925                 return NULL;
 926         }
 927
 928         return (char *)data.dptr;
 929 }
 930
 931 /*
 932  * attach to a ctdb database
 933  */
 934 NTSTATUS ctdbd_db_attach(struct ctdbd_connection *conn,
 935                          const char *name, uint32_t *db_id, int tdb_flags)
 936 {
 937         NTSTATUS status;
 938         TDB_DATA data;
 939         int32_t cstatus;
 940         bool persistent = (tdb_flags & TDB_CLEAR_IF_FIRST) == 0;
 941
 942         data.dptr = (uint8_t*)name;
 943         data.dsize = strlen(name)+1;
 944
 945         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 946                                persistent
 947                                ? CTDB_CONTROL_DB_ATTACH_PERSISTENT
 948                                : CTDB_CONTROL_DB_ATTACH,
 949                                tdb_flags, 0, data, NULL, &data, &cstatus);
 950         if (!NT_STATUS_IS_OK(status)) {
 951                 DEBUG(0, (__location__ " ctdb_control for db_attach "
 952                           "failed: %s\n", nt_errstr(status)));
 953                 return status;
 954         }
 955
 956         if (cstatus != 0 || data.dsize != sizeof(uint32_t)) {
 957                 DEBUG(0,(__location__ " ctdb_control for db_attach failed\n"));
 958                 return NT_STATUS_INTERNAL_ERROR;
 959         }
 960
 961         *db_id = *(uint32_t *)data.dptr;
 962         talloc_free(data.dptr);
 963
 964         if (!(tdb_flags & TDB_SEQNUM)) {
 965                 return NT_STATUS_OK;
 966         }
 967
 968         data.dptr = (uint8_t *)db_id;
 969         data.dsize = sizeof(*db_id);
 970
 971         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 972                                CTDB_CONTROL_ENABLE_SEQNUM, 0, 0, data,
 973                                NULL, NULL, &cstatus);
 974         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
 975                 DEBUG(0,(__location__ " ctdb_control for enable seqnum "
 976                          "failed\n"));
 977                 return NT_STATUS_IS_OK(status) ? NT_STATUS_INTERNAL_ERROR :
 978                         status;
 979         }
 980
 981         return NT_STATUS_OK;
 982 }
 983
 984 /*
 985  * force the migration of a record to this node
 986  */
 987 NTSTATUS ctdbd_migrate(struct ctdbd_connection *conn, uint32 db_id,
 988                        TDB_DATA key)
 989 {
 990         struct ctdb_req_call req;
 991         struct ctdb_reply_call *reply;
 992         NTSTATUS status;
 993
 994         ZERO_STRUCT(req);
 995
 996         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
 997         req.hdr.ctdb_magic   = CTDB_MAGIC;
 998         req.hdr.ctdb_version = CTDB_VERSION;
 999         req.hdr.operation    = CTDB_REQ_CALL;
1000         req.hdr.reqid        = ++conn->reqid;
1001         req.flags            = CTDB_IMMEDIATE_MIGRATION;
1002         req.callid           = CTDB_NULL_FUNC;
1003         req.db_id            = db_id;
1004         req.keylen           = key.dsize;
1005
1006         DEBUG(10, ("ctdbd_migrate: Sending ctdb packet\n"));
1007         ctdb_packet_dump(&req.hdr);
1008
1009         status = ctdb_packet_send(
1010                 conn->pkt, 2,
1011                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
1012                 data_blob_const(key.dptr, key.dsize));
1013
1014         if (!NT_STATUS_IS_OK(status)) {
1015                 DEBUG(3, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
1016                 return status;
1017         }
1018
1019         status = ctdb_packet_flush(conn->pkt);
1020
1021         if (!NT_STATUS_IS_OK(status)) {
1022                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
1023                 cluster_fatal("cluster dispatch daemon control write error\n");
1024         }
1025
1026         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
1027
1028         if (!NT_STATUS_IS_OK(status)) {
1029                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1030                 goto fail;
1031         }
1032
1033         if (reply->hdr.operation != CTDB_REPLY_CALL) {
1034                 DEBUG(0, ("received invalid reply\n"));
1035                 status = NT_STATUS_INTERNAL_ERROR;
1036                 goto fail;
1037         }
1038
1039         status = NT_STATUS_OK;
1040  fail:
1041
1042         TALLOC_FREE(reply);
1043         return status;
1044 }
1045
1046 /*
1047  * remotely fetch a record without locking it or forcing a migration
1048  */
1049 NTSTATUS ctdbd_fetch(struct ctdbd_connection *conn, uint32 db_id,
1050                      TDB_DATA key, TALLOC_CTX *mem_ctx, TDB_DATA *data)
1051 {
1052         struct ctdb_req_call req;
1053         struct ctdb_reply_call *reply;
1054         NTSTATUS status;
1055
1056         ZERO_STRUCT(req);
1057
1058         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
1059         req.hdr.ctdb_magic   = CTDB_MAGIC;
1060         req.hdr.ctdb_version = CTDB_VERSION;
1061         req.hdr.operation    = CTDB_REQ_CALL;
1062         req.hdr.reqid        = ++conn->reqid;
1063         req.flags            = 0;
1064         req.callid           = CTDB_FETCH_FUNC;
1065         req.db_id            = db_id;
1066         req.keylen           = key.dsize;
1067
1068         status = ctdb_packet_send(
1069                 conn->pkt, 2,
1070                 data_blob_const(&req, offsetof(struct ctdb_req_call, data)),
1071                 data_blob_const(key.dptr, key.dsize));
1072
1073         if (!NT_STATUS_IS_OK(status)) {
1074                 DEBUG(3, ("ctdb_packet_send failed: %s\n", nt_errstr(status)));
1075                 return status;
1076         }
1077
1078         status = ctdb_packet_flush(conn->pkt);
1079
1080         if (!NT_STATUS_IS_OK(status)) {
1081                 DEBUG(3, ("write to ctdbd failed: %s\n", nt_errstr(status)));
1082                 cluster_fatal("cluster dispatch daemon control write error\n");
1083         }
1084
1085         status = ctdb_read_req(conn, req.hdr.reqid, NULL, (void *)&reply);
1086
1087         if (!NT_STATUS_IS_OK(status)) {
1088                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1089                 goto fail;
1090         }
1091
1092         if (reply->hdr.operation != CTDB_REPLY_CALL) {
1093                 DEBUG(0, ("received invalid reply\n"));
1094                 status = NT_STATUS_INTERNAL_ERROR;
1095                 goto fail;
1096         }
1097
1098         data->dsize = reply->datalen;
1099         if (data->dsize == 0) {
1100                 data->dptr = NULL;
1101                 goto done;
1102         }
1103
1104         data->dptr = (uint8 *)talloc_memdup(mem_ctx, &reply->data[0],
1105                                             reply->datalen);
1106         if (data->dptr == NULL) {
1107                 DEBUG(0, ("talloc failed\n"));
1108                 status = NT_STATUS_NO_MEMORY;
1109                 goto fail;
1110         }
1111
1112  done:
1113         status = NT_STATUS_OK;
1114  fail:
1115         TALLOC_FREE(reply);
1116         return status;
1117 }
1118
1119 struct ctdbd_traverse_state {
1120         void (*fn)(TDB_DATA key, TDB_DATA data, void *private_data);
1121         void *private_data;
1122 };
1123
1124 /*
1125  * Handle a traverse record coming in on the ctdbd connection
1126  */
1127
1128 static NTSTATUS ctdb_traverse_handler(uint8_t *buf, size_t length,
1129                                       void *private_data)
1130 {
1131         struct ctdbd_traverse_state *state =
1132                 (struct ctdbd_traverse_state *)private_data;
1133
1134         struct ctdb_req_message *m;
1135         struct ctdb_rec_data *d;
1136         TDB_DATA key, data;
1137
1138         m = (struct ctdb_req_message *)buf;
1139
1140         if (length < sizeof(*m) || m->hdr.length != length) {
1141                 DEBUG(0, ("Got invalid message of length %d\n", (int)length));
1142                 TALLOC_FREE(buf);
1143                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1144         }
1145
1146         d = (struct ctdb_rec_data *)&m->data[0];
1147         if (m->datalen < sizeof(uint32_t) || m->datalen != d->length) {
1148                 DEBUG(0, ("Got invalid traverse data of length %d\n",
1149                           (int)m->datalen));
1150                 TALLOC_FREE(buf);
1151                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1152         }
1153
1154         key.dsize = d->keylen;
1155         key.dptr  = &d->data[0];
1156         data.dsize = d->datalen;
1157         data.dptr = &d->data[d->keylen];
1158
1159         if (key.dsize == 0 && data.dsize == 0) {
1160                 /* end of traverse */
1161                 return NT_STATUS_END_OF_FILE;
1162         }
1163
1164         if (data.dsize < sizeof(struct ctdb_ltdb_header)) {
1165                 DEBUG(0, ("Got invalid ltdb header length %d\n",
1166                           (int)data.dsize));
1167                 TALLOC_FREE(buf);
1168                 return NT_STATUS_UNEXPECTED_IO_ERROR;
1169         }
1170         data.dsize -= sizeof(struct ctdb_ltdb_header);
1171         data.dptr += sizeof(struct ctdb_ltdb_header);
1172
1173         if (state->fn) {
1174                 state->fn(key, data, state->private_data);
1175         }
1176
1177         TALLOC_FREE(buf);
1178         return NT_STATUS_OK;
1179 }
1180
1181 /*
1182   Traverse a ctdb database. This uses a kind-of hackish way to open a second
1183   connection to ctdbd to avoid the hairy recursive and async problems with
1184   everything in-line.
1185 */
1186
1187 NTSTATUS ctdbd_traverse(uint32 db_id,
1188                         void (*fn)(TDB_DATA key, TDB_DATA data,
1189                                    void *private_data),
1190                         void *private_data)
1191 {
1192         struct ctdbd_connection *conn;
1193         NTSTATUS status;
1194
1195         TDB_DATA data;
1196         struct ctdb_traverse_start t;
1197         int cstatus;
1198         struct ctdbd_traverse_state state;
1199
1200         status = ctdbd_init_connection(NULL, &conn);
1201         if (!NT_STATUS_IS_OK(status)) {
1202                 DEBUG(0, ("ctdbd_init_connection failed: %s\n",
1203                           nt_errstr(status)));
1204                 return status;
1205         }
1206
1207         t.db_id = db_id;
1208         t.srvid = conn->rand_srvid;
1209         t.reqid = ++conn->reqid;
1210
1211         data.dptr = (uint8_t *)&t;
1212         data.dsize = sizeof(t);
1213
1214         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1215                                CTDB_CONTROL_TRAVERSE_START, conn->rand_srvid, 0,
1216                                data, NULL, NULL, &cstatus);
1217
1218         if (!NT_STATUS_IS_OK(status) || (cstatus != 0)) {
1219
1220                 DEBUG(0,("ctdbd_control failed: %s, %d\n", nt_errstr(status),
1221                          cstatus));
1222
1223                 if (NT_STATUS_IS_OK(status)) {
1224                         /*
1225                          * We need a mapping here
1226                          */
1227                         status = NT_STATUS_UNSUCCESSFUL;
1228                 }
1229                 goto done;
1230         }
1231
1232         state.fn = fn;
1233         state.private_data = private_data;
1234
1235         while (True) {
1236
1237                 status = NT_STATUS_OK;
1238
1239                 if (ctdb_packet_handler(conn->pkt, ctdb_req_complete,
1240                                    ctdb_traverse_handler, &state, &status)) {
1241
1242                         if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1243                                 status = NT_STATUS_OK;
1244                                 break;
1245                         }
1246
1247                         /*
1248                          * There might be more in the queue
1249                          */
1250                         continue;
1251                 }
1252
1253                 if (!NT_STATUS_IS_OK(status)) {
1254                         break;
1255                 }
1256
1257                 status = ctdb_packet_fd_read_sync(conn->pkt);
1258
1259                 if (NT_STATUS_EQUAL(status, NT_STATUS_RETRY)) {
1260                         /*
1261                          * There might be more in the queue
1262                          */
1263                         continue;
1264                 }
1265
1266                 if (NT_STATUS_EQUAL(status, NT_STATUS_END_OF_FILE)) {
1267                         status = NT_STATUS_OK;
1268                         break;
1269                 }
1270
1271                 if (!NT_STATUS_IS_OK(status)) {
1272                         DEBUG(0, ("ctdb_packet_fd_read_sync failed: %s\n", nt_errstr(status)));
1273                         cluster_fatal("ctdbd died\n");
1274                 }
1275         }
1276
1277  done:
1278         TALLOC_FREE(conn);
1279         return status;
1280 }
1281
1282 /*
1283    This is used to canonicalize a ctdb_sock_addr structure.
1284 */
1285 static void smbd_ctdb_canonicalize_ip(const struct sockaddr_storage *in,
1286                                       struct sockaddr_storage *out)
1287 {
1288         memcpy(out, in, sizeof (*out));
1289
1290 #ifdef HAVE_IPV6
1291         if (in->ss_family == AF_INET6) {
1292                 const char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
1293                 const struct sockaddr_in6 *in6 = (struct sockaddr_in6 *)in;
1294                 struct sockaddr_in *out4 = (struct sockaddr_in *)out;
1295                 if (memcmp(&in6->sin6_addr, prefix, 12) == 0) {
1296                         memset(out, 0, sizeof(*out));
1297 #ifdef HAVE_SOCK_SIN_LEN
1298                         out4->sin_len = sizeof(*out);
1299 #endif
1300                         out4->sin_family = AF_INET;
1301                         out4->sin_port   = in6->sin6_port;
1302                         memcpy(&out4->sin_addr, &in6->sin6_addr.s6_addr32[3], 4);
1303                 }
1304         }
1305 #endif
1306 }
1307
1308 /*
1309  * Register us as a server for a particular tcp connection
1310  */
1311
1312 NTSTATUS ctdbd_register_ips(struct ctdbd_connection *conn,
1313                             const struct sockaddr_storage *_server,
1314                             const struct sockaddr_storage *_client,
1315                             void (*release_ip_handler)(const char *ip_addr,
1316                                                        void *private_data),
1317                             void *private_data)
1318 {
1319         /*
1320          * we still use ctdb_control_tcp for ipv4
1321          * because we want to work against older ctdb
1322          * versions at runtime
1323          */
1324         struct ctdb_control_tcp p4;
1325 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1326         struct ctdb_control_tcp_addr p;
1327 #endif
1328         TDB_DATA data;
1329         NTSTATUS status;
1330         struct sockaddr_storage client;
1331         struct sockaddr_storage server;
1332
1333         /*
1334          * Only one connection so far
1335          */
1336         SMB_ASSERT(conn->release_ip_handler == NULL);
1337
1338         smbd_ctdb_canonicalize_ip(_client, &client);
1339         smbd_ctdb_canonicalize_ip(_server, &server);
1340
1341         switch (client.ss_family) {
1342         case AF_INET:
1343                 p4.dest = *(struct sockaddr_in *)(void *)&server;
1344                 p4.src = *(struct sockaddr_in *)(void *)&client;
1345                 data.dptr = (uint8_t *)&p4;
1346                 data.dsize = sizeof(p4);
1347                 break;
1348 #ifdef HAVE_STRUCT_CTDB_CONTROL_TCP_ADDR
1349         case AF_INET6:
1350                 p.dest.ip6 = *(struct sockaddr_in6 *)(void *)&server;
1351                 p.src.ip6 = *(struct sockaddr_in6 *)(void *)&client;
1352                 data.dptr = (uint8_t *)&p;
1353                 data.dsize = sizeof(p);
1354                 break;
1355 #endif
1356         default:
1357                 return NT_STATUS_INTERNAL_ERROR;
1358         }
1359
1360         conn->release_ip_handler = release_ip_handler;
1361         /*
1362          * store the IP address of the server socket for later
1363          * comparison in release_ip()
1364          */
1365         conn->release_ip_priv = private_data;
1366
1367         /*
1368          * We want to be told about IP releases
1369          */
1370
1371         status = register_with_ctdbd(conn, CTDB_SRVID_RELEASE_IP);
1372         if (!NT_STATUS_IS_OK(status)) {
1373                 return status;
1374         }
1375
1376         /*
1377          * inform ctdb of our tcp connection, so if IP takeover happens ctdb
1378          * can send an extra ack to trigger a reset for our client, so it
1379          * immediately reconnects
1380          */
1381         return ctdbd_control(conn, CTDB_CURRENT_NODE,
1382                              CTDB_CONTROL_TCP_CLIENT, 0,
1383                              CTDB_CTRL_FLAG_NOREPLY, data, NULL, NULL, NULL);
1384 }
1385
1386 /*
1387  * We want to handle reconfigure events
1388  */
1389 NTSTATUS ctdbd_register_reconfigure(struct ctdbd_connection *conn)
1390 {
1391         return register_with_ctdbd(conn, CTDB_SRVID_RECONFIGURE);
1392 }
1393
1394 /*
1395   call a control on the local node
1396  */
1397 NTSTATUS ctdbd_control_local(struct ctdbd_connection *conn, uint32 opcode,
1398                              uint64_t srvid, uint32_t flags, TDB_DATA data,
1399                              TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
1400                              int *cstatus)
1401 {
1402         return ctdbd_control(conn, CTDB_CURRENT_NODE, opcode, srvid, flags, data, mem_ctx, outdata, cstatus);
1403 }
1404
1405 NTSTATUS ctdb_watch_us(struct ctdbd_connection *conn)
1406 {
1407         struct ctdb_client_notify_register reg_data;
1408         size_t struct_len;
1409         NTSTATUS status;
1410         int cstatus;
1411
1412         reg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1413         reg_data.len = 1;
1414         reg_data.notify_data[0] = 0;
1415
1416         struct_len = offsetof(struct ctdb_client_notify_register,
1417                               notify_data) + reg_data.len;
1418
1419         status = ctdbd_control_local(
1420                 conn, CTDB_CONTROL_REGISTER_NOTIFY, conn->rand_srvid, 0,
1421                 make_tdb_data((uint8_t *)&reg_data, struct_len),
1422                 NULL, NULL, &cstatus);
1423         if (!NT_STATUS_IS_OK(status)) {
1424                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1425                           nt_errstr(status)));
1426         }
1427         return status;
1428 }
1429
1430 NTSTATUS ctdb_unwatch(struct ctdbd_connection *conn)
1431 {
1432         struct ctdb_client_notify_deregister dereg_data;
1433         NTSTATUS status;
1434         int cstatus;
1435
1436         dereg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1437
1438         status = ctdbd_control_local(
1439                 conn, CTDB_CONTROL_DEREGISTER_NOTIFY, conn->rand_srvid, 0,
1440                 make_tdb_data((uint8_t *)&dereg_data, sizeof(dereg_data)),
1441                 NULL, NULL, &cstatus);
1442         if (!NT_STATUS_IS_OK(status)) {
1443                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1444                           nt_errstr(status)));
1445         }
1446         return status;
1447 }
1448
1449 #endif