source3/lib/ctdbd_conn.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Samba internal messaging functions
   4    Copyright (C) 2007 by Volker Lendecke
   5    Copyright (C) 2007 by Andrew Tridgell
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 #include "includes.h"
  22 #include "util_tdb.h"
  23 #include "serverid.h"
  24 #include "ctdbd_conn.h"
  25 #include "system/select.h"
  26
  27 #include "messages.h"
  28
  29 /*
  30  * It is not possible to include ctdb.h and tdb_compat.h (included via
  31  * some other include above) without warnings. This fixes those
  32  * warnings.
  33  */
  34
  35 #ifdef typesafe_cb
  36 #undef typesafe_cb
  37 #endif
  38
  39 #ifdef typesafe_cb_preargs
  40 #undef typesafe_cb_preargs
  41 #endif
  42
  43 #ifdef typesafe_cb_postargs
  44 #undef typesafe_cb_postargs
  45 #endif
  46
  47 /* paths to these include files come from --with-ctdb= in configure */
  48
  49 #include "ctdb.h"
  50 #include "ctdb_private.h"
  51
  52 struct ctdbd_connection {
  53         struct messaging_context *msg_ctx;
  54         uint32_t reqid;
  55         uint32_t our_vnn;
  56         uint64_t rand_srvid;
  57         int fd;
  58         struct tevent_fd *fde;
  59
  60         bool (*release_ip_handler)(const char *ip_addr, void *private_data);
  61         void *release_ip_priv;
  62 };
  63
  64 static uint32_t ctdbd_next_reqid(struct ctdbd_connection *conn)
  65 {
  66         conn->reqid += 1;
  67         if (conn->reqid == 0) {
  68                 conn->reqid += 1;
  69         }
  70         return conn->reqid;
  71 }
  72
  73 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
  74                               uint32_t vnn, uint32_t opcode,
  75                               uint64_t srvid, uint32_t flags, TDB_DATA data,
  76                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
  77                               int *cstatus);
  78
  79 /*
  80  * exit on fatal communications errors with the ctdbd daemon
  81  */
  82 static void cluster_fatal(const char *why)
  83 {
  84         DEBUG(0,("cluster fatal event: %s - exiting immediately\n", why));
  85         /* we don't use smb_panic() as we don't want to delay to write
  86            a core file. We need to release this process id immediately
  87            so that someone else can take over without getting sharing
  88            violations */
  89         _exit(1);
  90 }
  91
  92 /*
  93  *
  94  */
  95 static void ctdb_packet_dump(struct ctdb_req_header *hdr)
  96 {
  97         if (DEBUGLEVEL < 11) {
  98                 return;
  99         }
 100         DEBUGADD(11, ("len=%d, magic=%x, vers=%d, gen=%d, op=%d, reqid=%d\n",
 101                       (int)hdr->length, (int)hdr->ctdb_magic,
 102                       (int)hdr->ctdb_version, (int)hdr->generation,
 103                       (int)hdr->operation, (int)hdr->reqid));
 104 }
 105
 106 /*
 107  * Register a srvid with ctdbd
 108  */
 109 NTSTATUS register_with_ctdbd(struct ctdbd_connection *conn, uint64_t srvid)
 110 {
 111
 112         int cstatus;
 113         return ctdbd_control(conn, CTDB_CURRENT_NODE,
 114                              CTDB_CONTROL_REGISTER_SRVID, srvid, 0,
 115                              tdb_null, NULL, NULL, &cstatus);
 116 }
 117
 118 /*
 119  * get our vnn from the cluster
 120  */
 121 static NTSTATUS get_cluster_vnn(struct ctdbd_connection *conn, uint32_t *vnn)
 122 {
 123         int32_t cstatus=-1;
 124         NTSTATUS status;
 125         status = ctdbd_control(conn,
 126                                CTDB_CURRENT_NODE, CTDB_CONTROL_GET_PNN, 0, 0,
 127                                tdb_null, NULL, NULL, &cstatus);
 128         if (!NT_STATUS_IS_OK(status)) {
 129                 DEBUG(1, ("ctdbd_control failed: %s\n", nt_errstr(status)));
 130                 return status;
 131         }
 132         *vnn = (uint32_t)cstatus;
 133         return status;
 134 }
 135
 136 /*
 137  * Are we active (i.e. not banned or stopped?)
 138  */
 139 static bool ctdbd_working(struct ctdbd_connection *conn, uint32_t vnn)
 140 {
 141         int32_t cstatus=-1;
 142         NTSTATUS status;
 143         TDB_DATA outdata;
 144         struct ctdb_node_map *m;
 145         uint32_t failure_flags;
 146         bool ret = false;
 147         int i;
 148
 149         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
 150                                CTDB_CONTROL_GET_NODEMAP, 0, 0,
 151                                tdb_null, talloc_tos(), &outdata, &cstatus);
 152         if (!NT_STATUS_IS_OK(status)) {
 153                 DEBUG(1, ("ctdbd_control failed: %s\n", nt_errstr(status)));
 154                 return false;
 155         }
 156         if ((cstatus != 0) || (outdata.dptr == NULL)) {
 157                 DEBUG(2, ("Received invalid ctdb data\n"));
 158                 return false;
 159         }
 160
 161         m = (struct ctdb_node_map *)outdata.dptr;
 162
 163         for (i=0; i<m->num; i++) {
 164                 if (vnn == m->nodes[i].pnn) {
 165                         break;
 166                 }
 167         }
 168
 169         if (i == m->num) {
 170                 DEBUG(2, ("Did not find ourselves (node %d) in nodemap\n",
 171                           (int)vnn));
 172                 goto fail;
 173         }
 174
 175         failure_flags = NODE_FLAGS_BANNED | NODE_FLAGS_DISCONNECTED
 176                 | NODE_FLAGS_PERMANENTLY_DISABLED | NODE_FLAGS_STOPPED;
 177
 178         if ((m->nodes[i].flags & failure_flags) != 0) {
 179                 DEBUG(2, ("Node has status %x, not active\n",
 180                           (int)m->nodes[i].flags));
 181                 goto fail;
 182         }
 183
 184         ret = true;
 185 fail:
 186         TALLOC_FREE(outdata.dptr);
 187         return ret;
 188 }
 189
 190 uint32_t ctdbd_vnn(const struct ctdbd_connection *conn)
 191 {
 192         return conn->our_vnn;
 193 }
 194
 195 const char *lp_ctdbd_socket(void)
 196 {
 197         const char *ret;
 198
 199         ret = lp__ctdbd_socket();
 200         if (ret != NULL && strlen(ret) > 0) {
 201                 return ret;
 202         }
 203
 204         return CTDB_PATH;
 205 }
 206
 207 /*
 208  * Get us a ctdb connection
 209  */
 210
 211 static int ctdbd_connect(int *pfd)
 212 {
 213         const char *sockname = lp_ctdbd_socket();
 214         struct sockaddr_un addr = { 0, };
 215         int fd;
 216         socklen_t salen;
 217         size_t namelen;
 218
 219         fd = socket(AF_UNIX, SOCK_STREAM, 0);
 220         if (fd == -1) {
 221                 int err = errno;
 222                 DEBUG(3, ("Could not create socket: %s\n", strerror(err)));
 223                 return err;
 224         }
 225
 226         addr.sun_family = AF_UNIX;
 227
 228         namelen = strlcpy(addr.sun_path, sockname, sizeof(addr.sun_path));
 229         if (namelen >= sizeof(addr.sun_path)) {
 230                 DEBUG(3, ("%s: Socket name too long: %s\n", __func__,
 231                           sockname));
 232                 close(fd);
 233                 return ENAMETOOLONG;
 234         }
 235
 236         salen = sizeof(struct sockaddr_un);
 237
 238         if (connect(fd, (struct sockaddr *)(void *)&addr, salen) == -1) {
 239                 int err = errno;
 240                 DEBUG(1, ("connect(%s) failed: %s\n", sockname,
 241                           strerror(err)));
 242                 close(fd);
 243                 return err;
 244         }
 245
 246         *pfd = fd;
 247         return 0;
 248 }
 249
 250 /*
 251  * State necessary to defer an incoming message while we are waiting for a
 252  * ctdb reply.
 253  */
 254
 255 struct deferred_msg_state {
 256         struct messaging_context *msg_ctx;
 257         struct messaging_rec *rec;
 258 };
 259
 260 /*
 261  * Timed event handler for the deferred message
 262  */
 263
 264 static void deferred_message_dispatch(struct tevent_context *event_ctx,
 265                                       struct tevent_timer *te,
 266                                       struct timeval now,
 267                                       void *private_data)
 268 {
 269         struct deferred_msg_state *state = talloc_get_type_abort(
 270                 private_data, struct deferred_msg_state);
 271
 272         messaging_dispatch_rec(state->msg_ctx, state->rec);
 273         TALLOC_FREE(state);
 274         TALLOC_FREE(te);
 275 }
 276
 277 /*
 278  * Fetch a messaging_rec from an incoming ctdb style message
 279  */
 280
 281 static struct messaging_rec *ctdb_pull_messaging_rec(TALLOC_CTX *mem_ctx,
 282                                                      size_t overall_length,
 283                                                      struct ctdb_req_message *msg)
 284 {
 285         struct messaging_rec *result;
 286         DATA_BLOB blob;
 287         enum ndr_err_code ndr_err;
 288
 289         if ((overall_length < offsetof(struct ctdb_req_message, data))
 290             || (overall_length
 291                 < offsetof(struct ctdb_req_message, data) + msg->datalen)) {
 292
 293                 cluster_fatal("got invalid msg length");
 294         }
 295
 296         if (!(result = talloc(mem_ctx, struct messaging_rec))) {
 297                 DEBUG(0, ("talloc failed\n"));
 298                 return NULL;
 299         }
 300
 301         blob = data_blob_const(msg->data, msg->datalen);
 302
 303         ndr_err = ndr_pull_struct_blob(
 304                 &blob, result, result,
 305                 (ndr_pull_flags_fn_t)ndr_pull_messaging_rec);
 306
 307         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 308                 DEBUG(0, ("ndr_pull_struct_blob failed: %s\n",
 309                           ndr_errstr(ndr_err)));
 310                 TALLOC_FREE(result);
 311                 return NULL;
 312         }
 313
 314         if (DEBUGLEVEL >= 11) {
 315                 DEBUG(11, ("ctdb_pull_messaging_rec:\n"));
 316                 NDR_PRINT_DEBUG(messaging_rec, result);
 317         }
 318
 319         return result;
 320 }
 321
 322 static NTSTATUS ctdb_read_packet(int fd, TALLOC_CTX *mem_ctx,
 323                                  struct ctdb_req_header **result)
 324 {
 325         int timeout = lp_ctdb_timeout();
 326         struct ctdb_req_header *req;
 327         int ret, revents;
 328         uint32_t msglen;
 329         NTSTATUS status;
 330
 331         if (timeout == 0) {
 332                 timeout = -1;
 333         }
 334
 335         if (timeout != -1) {
 336                 ret = poll_one_fd(fd, POLLIN, timeout, &revents);
 337                 if (ret == -1) {
 338                         return map_nt_error_from_unix(errno);
 339                 }
 340                 if (ret == 0) {
 341                         return NT_STATUS_IO_TIMEOUT;
 342                 }
 343                 if (ret != 1) {
 344                         return NT_STATUS_UNEXPECTED_IO_ERROR;
 345                 }
 346         }
 347
 348         status = read_data(fd, (char *)&msglen, sizeof(msglen));
 349         if (!NT_STATUS_IS_OK(status)) {
 350                 return status;
 351         }
 352
 353         if (msglen < sizeof(struct ctdb_req_header)) {
 354                 return NT_STATUS_UNEXPECTED_IO_ERROR;
 355         }
 356
 357         req = talloc_size(mem_ctx, msglen);
 358         if (req == NULL) {
 359                 return NT_STATUS_NO_MEMORY;
 360         }
 361         talloc_set_name_const(req, "struct ctdb_req_header");
 362
 363         req->length = msglen;
 364
 365         status = read_data(fd, ((char *)req) + sizeof(msglen),
 366                            msglen - sizeof(msglen));
 367         if (!NT_STATUS_IS_OK(status)) {
 368                 return status;
 369         }
 370
 371         *result = req;
 372         return NT_STATUS_OK;
 373 }
 374
 375 /*
 376  * Read a full ctdbd request. If we have a messaging context, defer incoming
 377  * messages that might come in between.
 378  */
 379
 380 static NTSTATUS ctdb_read_req(struct ctdbd_connection *conn, uint32_t reqid,
 381                               TALLOC_CTX *mem_ctx,
 382                               struct ctdb_req_header **result)
 383 {
 384         struct ctdb_req_header *hdr;
 385         NTSTATUS status;
 386
 387  next_pkt:
 388
 389         status = ctdb_read_packet(conn->fd, mem_ctx, &hdr);
 390         if (!NT_STATUS_IS_OK(status)) {
 391                 DEBUG(0, ("ctdb_read_packet failed: %s\n", nt_errstr(status)));
 392                 cluster_fatal("ctdbd died\n");
 393         }
 394
 395         DEBUG(11, ("Received ctdb packet\n"));
 396         ctdb_packet_dump(hdr);
 397
 398         if (hdr->operation == CTDB_REQ_MESSAGE) {
 399                 struct tevent_timer *evt;
 400                 struct deferred_msg_state *msg_state;
 401                 struct ctdb_req_message *msg = (struct ctdb_req_message *)hdr;
 402
 403                 if (conn->msg_ctx == NULL) {
 404                         DEBUG(1, ("Got a message without having a msg ctx, "
 405                                   "dropping msg %llu\n",
 406                                   (long long unsigned)msg->srvid));
 407                         goto next_pkt;
 408                 }
 409
 410                 if ((conn->release_ip_handler != NULL)
 411                     && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 412                         bool ret;
 413
 414                         /* must be dispatched immediately */
 415                         DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 416                         ret = conn->release_ip_handler((const char *)msg->data,
 417                                                        conn->release_ip_priv);
 418                         TALLOC_FREE(hdr);
 419
 420                         if (ret) {
 421                                 /*
 422                                  * We need to release the ip,
 423                                  * so return an error to the upper layers.
 424                                  *
 425                                  * We make sure we don't trigger this again.
 426                                  */
 427                                 conn->release_ip_handler = NULL;
 428                                 conn->release_ip_priv = NULL;
 429                                 return NT_STATUS_ADDRESS_CLOSED;
 430                         }
 431                         goto next_pkt;
 432                 }
 433
 434                 if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 435                     || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)) {
 436
 437                         DEBUG(1, ("ctdb_read_req: Got %s message\n",
 438                                   (msg->srvid == CTDB_SRVID_RECONFIGURE)
 439                                   ? "cluster reconfigure" : "SAMBA_NOTIFY"));
 440
 441                         messaging_send(conn->msg_ctx,
 442                                        messaging_server_id(conn->msg_ctx),
 443                                        MSG_SMB_BRL_VALIDATE, &data_blob_null);
 444                         TALLOC_FREE(hdr);
 445                         goto next_pkt;
 446                 }
 447
 448                 msg_state = talloc(NULL, struct deferred_msg_state);
 449                 if (msg_state == NULL) {
 450                         DEBUG(0, ("talloc failed\n"));
 451                         TALLOC_FREE(hdr);
 452                         goto next_pkt;
 453                 }
 454
 455                 if (!(msg_state->rec = ctdb_pull_messaging_rec(
 456                               msg_state, msg->hdr.length, msg))) {
 457                         DEBUG(0, ("ctdbd_pull_messaging_rec failed\n"));
 458                         TALLOC_FREE(msg_state);
 459                         TALLOC_FREE(hdr);
 460                         goto next_pkt;
 461                 }
 462
 463                 TALLOC_FREE(hdr);
 464
 465                 msg_state->msg_ctx = conn->msg_ctx;
 466
 467                 /*
 468                  * We're waiting for a call reply, but an async message has
 469                  * crossed. Defer dispatching to the toplevel event loop.
 470                  */
 471                 evt = tevent_add_timer(messaging_tevent_context(conn->msg_ctx),
 472                                       messaging_tevent_context(conn->msg_ctx),
 473                                       timeval_zero(),
 474                                       deferred_message_dispatch,
 475                                       msg_state);
 476                 if (evt == NULL) {
 477                         DEBUG(0, ("event_add_timed failed\n"));
 478                         TALLOC_FREE(msg_state);
 479                         TALLOC_FREE(hdr);
 480                         goto next_pkt;
 481                 }
 482
 483                 goto next_pkt;
 484         }
 485
 486         if ((reqid != 0) && (hdr->reqid != reqid)) {
 487                 /* we got the wrong reply */
 488                 DEBUG(0,("Discarding mismatched ctdb reqid %u should have "
 489                          "been %u\n", hdr->reqid, reqid));
 490                 TALLOC_FREE(hdr);
 491                 goto next_pkt;
 492         }
 493
 494         *result = talloc_move(mem_ctx, &hdr);
 495
 496         return NT_STATUS_OK;
 497 }
 498
 499 static int ctdbd_connection_destructor(struct ctdbd_connection *c)
 500 {
 501         close(c->fd);
 502         return 0;
 503 }
 504 /*
 505  * Get us a ctdbd connection
 506  */
 507
 508 static NTSTATUS ctdbd_init_connection(TALLOC_CTX *mem_ctx,
 509                                       struct ctdbd_connection **pconn)
 510 {
 511         struct ctdbd_connection *conn;
 512         int ret;
 513         NTSTATUS status;
 514
 515         if (!(conn = talloc_zero(mem_ctx, struct ctdbd_connection))) {
 516                 DEBUG(0, ("talloc failed\n"));
 517                 return NT_STATUS_NO_MEMORY;
 518         }
 519
 520         ret = ctdbd_connect(&conn->fd);
 521         if (ret != 0) {
 522                 status = map_nt_error_from_unix(errno);
 523                 DEBUG(10, ("ctdbd_connect failed: %s\n", strerror(errno)));
 524                 goto fail;
 525         }
 526         talloc_set_destructor(conn, ctdbd_connection_destructor);
 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)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 conn->fd;
 607 }
 608
 609 /*
 610  * Packet handler to receive and handle a ctdb message
 611  */
 612 static NTSTATUS ctdb_handle_message(struct messaging_context *msg_ctx,
 613                                     struct ctdbd_connection *conn,
 614                                     struct ctdb_req_header *hdr)
 615 {
 616         struct ctdb_req_message *msg;
 617         struct messaging_rec *msg_rec;
 618
 619         if (hdr->operation != CTDB_REQ_MESSAGE) {
 620                 DEBUG(0, ("Received async msg of type %u, discarding\n",
 621                           hdr->operation));
 622                 return NT_STATUS_INVALID_PARAMETER;
 623         }
 624
 625         msg = (struct ctdb_req_message *)hdr;
 626
 627         if ((conn->release_ip_handler != NULL)
 628             && (msg->srvid == CTDB_SRVID_RELEASE_IP)) {
 629                 bool ret;
 630
 631                 /* must be dispatched immediately */
 632                 DEBUG(10, ("received CTDB_SRVID_RELEASE_IP\n"));
 633                 ret = conn->release_ip_handler((const char *)msg->data,
 634                                                conn->release_ip_priv);
 635                 if (ret) {
 636                         /*
 637                          * We need to release the ip.
 638                          *
 639                          * We make sure we don't trigger this again.
 640                          */
 641                         conn->release_ip_handler = NULL;
 642                         conn->release_ip_priv = NULL;
 643                 }
 644                 return NT_STATUS_OK;
 645         }
 646
 647         SMB_ASSERT(conn->msg_ctx != NULL);
 648
 649         if ((msg->srvid == CTDB_SRVID_RECONFIGURE)
 650             || (msg->srvid == CTDB_SRVID_SAMBA_NOTIFY)){
 651                 DEBUG(0,("Got cluster reconfigure message\n"));
 652                 /*
 653                  * when the cluster is reconfigured or someone of the
 654                  * family has passed away (SAMBA_NOTIFY), we need to
 655                  * clean the brl database
 656                  */
 657                 messaging_send(conn->msg_ctx,
 658                                messaging_server_id(conn->msg_ctx),
 659                                MSG_SMB_BRL_VALIDATE, &data_blob_null);
 660
 661                 return NT_STATUS_OK;
 662         }
 663
 664         /* only messages to our pid or the broadcast are valid here */
 665         if (msg->srvid != getpid() && msg->srvid != MSG_SRVID_SAMBA) {
 666                 DEBUG(0,("Got unexpected message with srvid=%llu\n",
 667                          (unsigned long long)msg->srvid));
 668                 return NT_STATUS_OK;
 669         }
 670
 671         msg_rec = ctdb_pull_messaging_rec(talloc_tos(), msg->hdr.length, msg);
 672         if (msg_rec == NULL) {
 673                 DEBUG(10, ("ctdb_pull_messaging_rec failed\n"));
 674                 return NT_STATUS_NO_MEMORY;
 675         }
 676         messaging_dispatch_rec(conn->msg_ctx, msg_rec);
 677         return NT_STATUS_OK;
 678 }
 679
 680 /*
 681  * The ctdbd socket is readable asynchronuously
 682  */
 683
 684 static void ctdbd_socket_handler(struct tevent_context *event_ctx,
 685                                  struct tevent_fd *event,
 686                                  uint16 flags,
 687                                  void *private_data)
 688 {
 689         struct ctdbd_connection *conn = talloc_get_type_abort(
 690                 private_data, struct ctdbd_connection);
 691         struct ctdb_req_header *hdr;
 692         NTSTATUS status;
 693
 694         status = ctdb_read_packet(conn->fd, talloc_tos(), &hdr);
 695         if (!NT_STATUS_IS_OK(status)) {
 696                 DEBUG(0, ("ctdb_read_packet failed: %s\n", nt_errstr(status)));
 697                 cluster_fatal("ctdbd died\n");
 698         }
 699
 700         status = ctdb_handle_message(conn->msg_ctx, conn, hdr);
 701         if (!NT_STATUS_IS_OK(status)) {
 702                 DEBUG(10, ("could not handle incoming message: %s\n",
 703                            nt_errstr(status)));
 704         }
 705 }
 706
 707 /*
 708  * Prepare a ctdbd connection to receive messages
 709  */
 710
 711 NTSTATUS ctdbd_register_msg_ctx(struct ctdbd_connection *conn,
 712                                 struct messaging_context *msg_ctx)
 713 {
 714         SMB_ASSERT(conn->msg_ctx == NULL);
 715         SMB_ASSERT(conn->fde == NULL);
 716
 717         if (!(conn->fde = tevent_add_fd(messaging_tevent_context(msg_ctx),
 718                                        conn,
 719                                        conn->fd,
 720                                        TEVENT_FD_READ,
 721                                        ctdbd_socket_handler,
 722                                        conn))) {
 723                 DEBUG(0, ("event_add_fd failed\n"));
 724                 return NT_STATUS_NO_MEMORY;
 725         }
 726
 727         conn->msg_ctx = msg_ctx;
 728
 729         return NT_STATUS_OK;
 730 }
 731
 732 /*
 733  * Send a messaging message across a ctdbd
 734  */
 735
 736 NTSTATUS ctdbd_messaging_send(struct ctdbd_connection *conn,
 737                               uint32_t dst_vnn, uint64_t dst_srvid,
 738                               struct messaging_rec *msg)
 739 {
 740         DATA_BLOB blob;
 741         NTSTATUS status;
 742         enum ndr_err_code ndr_err;
 743
 744         ndr_err = ndr_push_struct_blob(
 745                 &blob, talloc_tos(), msg,
 746                 (ndr_push_flags_fn_t)ndr_push_messaging_rec);
 747
 748         if (!NDR_ERR_CODE_IS_SUCCESS(ndr_err)) {
 749                 DEBUG(0, ("ndr_push_struct_blob failed: %s\n",
 750                           ndr_errstr(ndr_err)));
 751                 return ndr_map_error2ntstatus(ndr_err);
 752         }
 753
 754         status = ctdbd_messaging_send_blob(conn, dst_vnn, dst_srvid,
 755                                            blob.data, blob.length);
 756         TALLOC_FREE(blob.data);
 757         return status;
 758 }
 759
 760 NTSTATUS ctdbd_messaging_send_blob(struct ctdbd_connection *conn,
 761                                    uint32_t dst_vnn, uint64_t dst_srvid,
 762                                    const uint8_t *buf, size_t buflen)
 763 {
 764         struct ctdb_req_message r;
 765         struct iovec iov[2];
 766         ssize_t nwritten;
 767
 768         r.hdr.length = offsetof(struct ctdb_req_message, data) + buflen;
 769         r.hdr.ctdb_magic = CTDB_MAGIC;
 770         r.hdr.ctdb_version = CTDB_VERSION;
 771         r.hdr.generation = 1;
 772         r.hdr.operation  = CTDB_REQ_MESSAGE;
 773         r.hdr.destnode   = dst_vnn;
 774         r.hdr.srcnode    = conn->our_vnn;
 775         r.hdr.reqid      = 0;
 776         r.srvid          = dst_srvid;
 777         r.datalen        = buflen;
 778
 779         DEBUG(10, ("ctdbd_messaging_send: Sending ctdb packet\n"));
 780         ctdb_packet_dump(&r.hdr);
 781
 782         iov[0].iov_base = &r;
 783         iov[0].iov_len = offsetof(struct ctdb_req_message, data);
 784         iov[1].iov_base = discard_const_p(uint8_t, buf);
 785         iov[1].iov_len = buflen;
 786
 787         nwritten = write_data_iov(conn->fd, iov, ARRAY_SIZE(iov));
 788         if (nwritten == -1) {
 789                 DEBUG(3, ("write_data_iov failed: %s\n", strerror(errno)));
 790                 cluster_fatal("cluster dispatch daemon msg write error\n");
 791         }
 792
 793         return NT_STATUS_OK;
 794 }
 795
 796 /*
 797  * send/recv a generic ctdb control message
 798  */
 799 static NTSTATUS ctdbd_control(struct ctdbd_connection *conn,
 800                               uint32_t vnn, uint32_t opcode,
 801                               uint64_t srvid, uint32_t flags,
 802                               TDB_DATA data,
 803                               TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
 804                               int *cstatus)
 805 {
 806         struct ctdb_req_control req;
 807         struct ctdb_req_header *hdr;
 808         struct ctdb_reply_control *reply = NULL;
 809         struct ctdbd_connection *new_conn = NULL;
 810         struct iovec iov[2];
 811         ssize_t nwritten;
 812         NTSTATUS status;
 813
 814         if (conn == NULL) {
 815                 status = ctdbd_init_connection(NULL, &new_conn);
 816
 817                 if (!NT_STATUS_IS_OK(status)) {
 818                         DEBUG(10, ("Could not init temp connection: %s\n",
 819                                    nt_errstr(status)));
 820                         goto fail;
 821                 }
 822
 823                 conn = new_conn;
 824         }
 825
 826         ZERO_STRUCT(req);
 827         req.hdr.length = offsetof(struct ctdb_req_control, data) + data.dsize;
 828         req.hdr.ctdb_magic   = CTDB_MAGIC;
 829         req.hdr.ctdb_version = CTDB_VERSION;
 830         req.hdr.operation    = CTDB_REQ_CONTROL;
 831         req.hdr.reqid        = ctdbd_next_reqid(conn);
 832         req.hdr.destnode     = vnn;
 833         req.opcode           = opcode;
 834         req.srvid            = srvid;
 835         req.datalen          = data.dsize;
 836         req.flags            = flags;
 837
 838         DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
 839         ctdb_packet_dump(&req.hdr);
 840
 841         iov[0].iov_base = &req;
 842         iov[0].iov_len = offsetof(struct ctdb_req_control, data);
 843         iov[1].iov_base = data.dptr;
 844         iov[1].iov_len = data.dsize;
 845
 846         nwritten = write_data_iov(conn->fd, iov, ARRAY_SIZE(iov));
 847         if (nwritten == -1) {
 848                 DEBUG(3, ("write_data_iov failed: %s\n", strerror(errno)));
 849                 cluster_fatal("cluster dispatch daemon msg write error\n");
 850         }
 851
 852         if (flags & CTDB_CTRL_FLAG_NOREPLY) {
 853                 TALLOC_FREE(new_conn);
 854                 if (cstatus) {
 855                         *cstatus = 0;
 856                 }
 857                 return NT_STATUS_OK;
 858         }
 859
 860         status = ctdb_read_req(conn, req.hdr.reqid, NULL, &hdr);
 861
 862         if (!NT_STATUS_IS_OK(status)) {
 863                 DEBUG(10, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
 864                 goto fail;
 865         }
 866
 867         if (hdr->operation != CTDB_REPLY_CONTROL) {
 868                 DEBUG(0, ("received invalid reply\n"));
 869                 goto fail;
 870         }
 871         reply = (struct ctdb_reply_control *)hdr;
 872
 873         if (outdata) {
 874                 if (!(outdata->dptr = (uint8 *)talloc_memdup(
 875                               mem_ctx, reply->data, reply->datalen))) {
 876                         TALLOC_FREE(reply);
 877                         return NT_STATUS_NO_MEMORY;
 878                 }
 879                 outdata->dsize = reply->datalen;
 880         }
 881         if (cstatus) {
 882                 (*cstatus) = reply->status;
 883         }
 884
 885         status = NT_STATUS_OK;
 886
 887  fail:
 888         TALLOC_FREE(new_conn);
 889         TALLOC_FREE(reply);
 890         return status;
 891 }
 892
 893 /*
 894  * see if a remote process exists
 895  */
 896 bool ctdbd_process_exists(struct ctdbd_connection *conn, uint32_t vnn, pid_t pid)
 897 {
 898         struct server_id id;
 899         bool result;
 900
 901         id.pid = pid;
 902         id.vnn = vnn;
 903
 904         if (!ctdb_processes_exist(conn, &id, 1, &result)) {
 905                 DEBUG(10, ("ctdb_processes_exist failed\n"));
 906                 return false;
 907         }
 908         return result;
 909 }
 910
 911 bool ctdb_processes_exist(struct ctdbd_connection *conn,
 912                           const struct server_id *pids, int num_pids,
 913                           bool *results)
 914 {
 915         TALLOC_CTX *frame = talloc_stackframe();
 916         int i, num_received;
 917         NTSTATUS status;
 918         uint32_t *reqids;
 919         bool result = false;
 920
 921         reqids = talloc_array(talloc_tos(), uint32_t, num_pids);
 922         if (reqids == NULL) {
 923                 goto fail;
 924         }
 925
 926         for (i=0; i<num_pids; i++) {
 927                 struct ctdb_req_control req;
 928                 pid_t pid;
 929                 struct iovec iov[2];
 930                 ssize_t nwritten;
 931
 932                 results[i] = false;
 933                 reqids[i] = ctdbd_next_reqid(conn);
 934
 935                 ZERO_STRUCT(req);
 936
 937                 /*
 938                  * pids[i].pid is uint64_t, scale down to pid_t which
 939                  * is the wire protocol towards ctdb.
 940                  */
 941                 pid = pids[i].pid;
 942
 943                 DEBUG(10, ("Requesting PID %d/%d, reqid=%d\n",
 944                            (int)pids[i].vnn, (int)pid,
 945                            (int)reqids[i]));
 946
 947                 req.hdr.length = offsetof(struct ctdb_req_control, data);
 948                 req.hdr.length += sizeof(pid);
 949                 req.hdr.ctdb_magic   = CTDB_MAGIC;
 950                 req.hdr.ctdb_version = CTDB_VERSION;
 951                 req.hdr.operation    = CTDB_REQ_CONTROL;
 952                 req.hdr.reqid        = reqids[i];
 953                 req.hdr.destnode     = pids[i].vnn;
 954                 req.opcode           = CTDB_CONTROL_PROCESS_EXISTS;
 955                 req.srvid            = 0;
 956                 req.datalen          = sizeof(pid);
 957                 req.flags            = 0;
 958
 959                 DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
 960                 ctdb_packet_dump(&req.hdr);
 961
 962                 iov[0].iov_base = &req;
 963                 iov[0].iov_len = offsetof(struct ctdb_req_control, data);
 964                 iov[1].iov_base = &pid;
 965                 iov[1].iov_len = sizeof(pid);
 966
 967                 nwritten = write_data_iov(conn->fd, iov, ARRAY_SIZE(iov));
 968                 if (nwritten == -1) {
 969                         status = map_nt_error_from_unix(errno);
 970                         DEBUG(10, ("write_data_iov failed: %s\n",
 971                                    strerror(errno)));
 972                         goto fail;
 973                 }
 974         }
 975
 976         num_received = 0;
 977
 978         while (num_received < num_pids) {
 979                 struct ctdb_req_header *hdr;
 980                 struct ctdb_reply_control *reply;
 981                 uint32_t reqid;
 982
 983                 status = ctdb_read_req(conn, 0, talloc_tos(), &hdr);
 984                 if (!NT_STATUS_IS_OK(status)) {
 985                         DEBUG(10, ("ctdb_read_req failed: %s\n",
 986                                    nt_errstr(status)));
 987                         goto fail;
 988                 }
 989
 990                 if (hdr->operation != CTDB_REPLY_CONTROL) {
 991                         DEBUG(10, ("Received invalid reply\n"));
 992                         goto fail;
 993                 }
 994                 reply = (struct ctdb_reply_control *)hdr;
 995
 996                 reqid = reply->hdr.reqid;
 997
 998                 DEBUG(10, ("Received reqid %d\n", (int)reqid));
 999
1000                 for (i=0; i<num_pids; i++) {
1001                         if (reqid == reqids[i]) {
1002                                 break;
1003                         }
1004                 }
1005                 if (i == num_pids) {
1006                         DEBUG(10, ("Received unknown record number %u\n",
1007                                    (unsigned)reqid));
1008                         goto fail;
1009                 }
1010                 results[i] = ((reply->status) == 0);
1011                 TALLOC_FREE(reply);
1012                 num_received += 1;
1013         }
1014
1015         result = true;
1016 fail:
1017         TALLOC_FREE(frame);
1018         return result;
1019 }
1020
1021 struct ctdb_vnn_list {
1022         uint32_t vnn;
1023         uint32_t reqid;
1024         unsigned num_srvids;
1025         unsigned num_filled;
1026         uint64_t *srvids;
1027         unsigned *pid_indexes;
1028 };
1029
1030 /*
1031  * Get a list of all vnns mentioned in a list of
1032  * server_ids. vnn_indexes tells where in the vnns array we have to
1033  * place the pids.
1034  */
1035 static bool ctdb_collect_vnns(TALLOC_CTX *mem_ctx,
1036                               const struct server_id *pids, unsigned num_pids,
1037                               struct ctdb_vnn_list **pvnns,
1038                               unsigned *pnum_vnns)
1039 {
1040         struct ctdb_vnn_list *vnns = NULL;
1041         unsigned *vnn_indexes = NULL;
1042         unsigned i, num_vnns = 0;
1043
1044         vnn_indexes = talloc_array(mem_ctx, unsigned, num_pids);
1045         if (vnn_indexes == NULL) {
1046                 DEBUG(1, ("talloc_array failed\n"));
1047                 goto fail;
1048         }
1049
1050         for (i=0; i<num_pids; i++) {
1051                 unsigned j;
1052                 uint32_t vnn = pids[i].vnn;
1053
1054                 for (j=0; j<num_vnns; j++) {
1055                         if (vnn == vnns[j].vnn) {
1056                                 break;
1057                         }
1058                 }
1059                 vnn_indexes[i] = j;
1060
1061                 if (j < num_vnns) {
1062                         /*
1063                          * Already in the array
1064                          */
1065                         vnns[j].num_srvids += 1;
1066                         continue;
1067                 }
1068                 vnns = talloc_realloc(mem_ctx, vnns, struct ctdb_vnn_list,
1069                                       num_vnns+1);
1070                 if (vnns == NULL) {
1071                         DEBUG(1, ("talloc_realloc failed\n"));
1072                         goto fail;
1073                 }
1074                 vnns[num_vnns].vnn = vnn;
1075                 vnns[num_vnns].num_srvids = 1;
1076                 vnns[num_vnns].num_filled = 0;
1077                 num_vnns += 1;
1078         }
1079         for (i=0; i<num_vnns; i++) {
1080                 struct ctdb_vnn_list *vnn = &vnns[i];
1081
1082                 vnn->srvids = talloc_array(vnns, uint64_t, vnn->num_srvids);
1083                 if (vnn->srvids == NULL) {
1084                         DEBUG(1, ("talloc_array failed\n"));
1085                         goto fail;
1086                 }
1087                 vnn->pid_indexes = talloc_array(vnns, unsigned,
1088                                                 vnn->num_srvids);
1089                 if (vnn->pid_indexes == NULL) {
1090                         DEBUG(1, ("talloc_array failed\n"));
1091                         goto fail;
1092                 }
1093         }
1094         for (i=0; i<num_pids; i++) {
1095                 struct ctdb_vnn_list *vnn = &vnns[vnn_indexes[i]];
1096                 vnn->srvids[vnn->num_filled] = pids[i].unique_id;
1097                 vnn->pid_indexes[vnn->num_filled] = i;
1098                 vnn->num_filled += 1;
1099         }
1100
1101         TALLOC_FREE(vnn_indexes);
1102         *pvnns = vnns;
1103         *pnum_vnns = num_vnns;
1104         return true;
1105 fail:
1106         TALLOC_FREE(vnns);
1107         TALLOC_FREE(vnn_indexes);
1108         return false;
1109 }
1110
1111 bool ctdb_serverids_exist_supported(struct ctdbd_connection *conn)
1112 {
1113         return true;
1114 }
1115
1116 bool ctdb_serverids_exist(struct ctdbd_connection *conn,
1117                           const struct server_id *pids, unsigned num_pids,
1118                           bool *results)
1119 {
1120         unsigned i, num_received;
1121         NTSTATUS status;
1122         struct ctdb_vnn_list *vnns = NULL;
1123         unsigned num_vnns;
1124
1125         if (!ctdb_collect_vnns(talloc_tos(), pids, num_pids,
1126                                &vnns, &num_vnns)) {
1127                 DEBUG(1, ("ctdb_collect_vnns failed\n"));
1128                 goto fail;
1129         }
1130
1131         for (i=0; i<num_vnns; i++) {
1132                 struct ctdb_vnn_list *vnn = &vnns[i];
1133                 struct ctdb_req_control req;
1134                 struct iovec iov[2];
1135                 ssize_t nwritten;
1136
1137                 vnn->reqid = ctdbd_next_reqid(conn);
1138
1139                 ZERO_STRUCT(req);
1140
1141                 DEBUG(10, ("Requesting VNN %d, reqid=%d, num_srvids=%u\n",
1142                            (int)vnn->vnn, (int)vnn->reqid, vnn->num_srvids));
1143
1144                 req.hdr.length = offsetof(struct ctdb_req_control, data);
1145                 req.hdr.ctdb_magic   = CTDB_MAGIC;
1146                 req.hdr.ctdb_version = CTDB_VERSION;
1147                 req.hdr.operation    = CTDB_REQ_CONTROL;
1148                 req.hdr.reqid        = vnn->reqid;
1149                 req.hdr.destnode     = vnn->vnn;
1150                 req.opcode           = CTDB_CONTROL_CHECK_SRVIDS;
1151                 req.srvid            = 0;
1152                 req.datalen          = sizeof(uint64_t) * vnn->num_srvids;
1153                 req.hdr.length      += req.datalen;
1154                 req.flags            = 0;
1155
1156                 DEBUG(10, ("ctdbd_control: Sending ctdb packet\n"));
1157                 ctdb_packet_dump(&req.hdr);
1158
1159                 iov[0].iov_base = &req;
1160                 iov[0].iov_len = offsetof(struct ctdb_req_control, data);
1161                 iov[1].iov_base = vnn->srvids;
1162                 iov[1].iov_len = req.datalen;
1163
1164                 nwritten = write_data_iov(conn->fd, iov, ARRAY_SIZE(iov));
1165                 if (nwritten == -1) {
1166                         status = map_nt_error_from_unix(errno);
1167                         DEBUG(10, ("write_data_iov failed: %s\n",
1168                                    strerror(errno)));
1169                         goto fail;
1170                 }
1171         }
1172
1173         num_received = 0;
1174
1175         while (num_received < num_vnns) {
1176                 struct ctdb_req_header *hdr;
1177                 struct ctdb_reply_control *reply;
1178                 struct ctdb_vnn_list *vnn;
1179                 uint32_t reqid;
1180                 uint8_t *reply_data;
1181
1182                 status = ctdb_read_req(conn, 0, talloc_tos(), &hdr);
1183                 if (!NT_STATUS_IS_OK(status)) {
1184                         DEBUG(1, ("ctdb_read_req failed: %s\n",
1185                                   nt_errstr(status)));
1186                         goto fail;
1187                 }
1188
1189                 if (hdr->operation != CTDB_REPLY_CONTROL) {
1190                         DEBUG(1, ("Received invalid reply %u\n",
1191                                   (unsigned)reply->hdr.operation));
1192                         goto fail;
1193                 }
1194                 reply = (struct ctdb_reply_control *)hdr;
1195
1196                 reqid = reply->hdr.reqid;
1197
1198                 DEBUG(10, ("Received reqid %d\n", (int)reqid));
1199
1200                 for (i=0; i<num_vnns; i++) {
1201                         if (reqid == vnns[i].reqid) {
1202                                 break;
1203                         }
1204                 }
1205                 if (i == num_vnns) {
1206                         DEBUG(1, ("Received unknown reqid number %u\n",
1207                                   (unsigned)reqid));
1208                         goto fail;
1209                 }
1210
1211                 DEBUG(10, ("Found index %u\n", i));
1212
1213                 vnn = &vnns[i];
1214
1215                 DEBUG(10, ("Received vnn %u, vnn->num_srvids %u, datalen %u\n",
1216                            (unsigned)vnn->vnn, vnn->num_srvids,
1217                            (unsigned)reply->datalen));
1218
1219                 if (reply->datalen >= ((vnn->num_srvids+7)/8)) {
1220                         /*
1221                          * Got a real reply
1222                          */
1223                         reply_data = reply->data;
1224                 } else {
1225                         /*
1226                          * Got an error reply
1227                          */
1228                         DEBUG(5, ("Received short reply len %d, status %u, "
1229                                   "errorlen %u\n",
1230                                   (unsigned)reply->datalen,
1231                                   (unsigned)reply->status,
1232                                   (unsigned)reply->errorlen));
1233                         dump_data(5, reply->data, reply->errorlen);
1234
1235                         /*
1236                          * This will trigger everything set to false
1237                          */
1238                         reply_data = NULL;
1239                 }
1240
1241                 for (i=0; i<vnn->num_srvids; i++) {
1242                         int idx = vnn->pid_indexes[i];
1243
1244                         if (pids[i].unique_id ==
1245                             SERVERID_UNIQUE_ID_NOT_TO_VERIFY) {
1246                                 results[idx] = true;
1247                                 continue;
1248                         }
1249                         results[idx] =
1250                                 (reply_data != NULL) &&
1251                                 ((reply_data[i/8] & (1<<(i%8))) != 0);
1252                 }
1253
1254                 TALLOC_FREE(reply);
1255                 num_received += 1;
1256         }
1257
1258         TALLOC_FREE(vnns);
1259         return true;
1260 fail:
1261         cluster_fatal("serverids_exist failed");
1262         return false;
1263 }
1264
1265 /*
1266  * Get a db path
1267  */
1268 char *ctdbd_dbpath(struct ctdbd_connection *conn,
1269                    TALLOC_CTX *mem_ctx, uint32_t db_id)
1270 {
1271         NTSTATUS status;
1272         TDB_DATA data;
1273         int32_t cstatus;
1274
1275         data.dptr = (uint8_t*)&db_id;
1276         data.dsize = sizeof(db_id);
1277
1278         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1279                                CTDB_CONTROL_GETDBPATH, 0, 0, data,
1280                                mem_ctx, &data, &cstatus);
1281         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
1282                 DEBUG(0,(__location__ " ctdb_control for getdbpath failed\n"));
1283                 return NULL;
1284         }
1285
1286         return (char *)data.dptr;
1287 }
1288
1289 /*
1290  * attach to a ctdb database
1291  */
1292 NTSTATUS ctdbd_db_attach(struct ctdbd_connection *conn,
1293                          const char *name, uint32_t *db_id, int tdb_flags)
1294 {
1295         NTSTATUS status;
1296         TDB_DATA data;
1297         int32_t cstatus;
1298         bool persistent = (tdb_flags & TDB_CLEAR_IF_FIRST) == 0;
1299
1300         data = string_term_tdb_data(name);
1301
1302         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1303                                persistent
1304                                ? CTDB_CONTROL_DB_ATTACH_PERSISTENT
1305                                : CTDB_CONTROL_DB_ATTACH,
1306                                tdb_flags, 0, data, NULL, &data, &cstatus);
1307         if (!NT_STATUS_IS_OK(status)) {
1308                 DEBUG(0, (__location__ " ctdb_control for db_attach "
1309                           "failed: %s\n", nt_errstr(status)));
1310                 return status;
1311         }
1312
1313         if (cstatus != 0 || data.dsize != sizeof(uint32_t)) {
1314                 DEBUG(0,(__location__ " ctdb_control for db_attach failed\n"));
1315                 return NT_STATUS_INTERNAL_ERROR;
1316         }
1317
1318         *db_id = *(uint32_t *)data.dptr;
1319         talloc_free(data.dptr);
1320
1321         if (!(tdb_flags & TDB_SEQNUM)) {
1322                 return NT_STATUS_OK;
1323         }
1324
1325         data.dptr = (uint8_t *)db_id;
1326         data.dsize = sizeof(*db_id);
1327
1328         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1329                                CTDB_CONTROL_ENABLE_SEQNUM, 0, 0, data,
1330                                NULL, NULL, &cstatus);
1331         if (!NT_STATUS_IS_OK(status) || cstatus != 0) {
1332                 DEBUG(0,(__location__ " ctdb_control for enable seqnum "
1333                          "failed\n"));
1334                 return NT_STATUS_IS_OK(status) ? NT_STATUS_INTERNAL_ERROR :
1335                         status;
1336         }
1337
1338         return NT_STATUS_OK;
1339 }
1340
1341 /*
1342  * force the migration of a record to this node
1343  */
1344 NTSTATUS ctdbd_migrate(struct ctdbd_connection *conn, uint32_t db_id,
1345                        TDB_DATA key)
1346 {
1347         struct ctdb_req_call req;
1348         struct ctdb_req_header *hdr;
1349         struct iovec iov[2];
1350         ssize_t nwritten;
1351         NTSTATUS status;
1352
1353         ZERO_STRUCT(req);
1354
1355         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
1356         req.hdr.ctdb_magic   = CTDB_MAGIC;
1357         req.hdr.ctdb_version = CTDB_VERSION;
1358         req.hdr.operation    = CTDB_REQ_CALL;
1359         req.hdr.reqid        = ctdbd_next_reqid(conn);
1360         req.flags            = CTDB_IMMEDIATE_MIGRATION;
1361         req.callid           = CTDB_NULL_FUNC;
1362         req.db_id            = db_id;
1363         req.keylen           = key.dsize;
1364
1365         DEBUG(10, ("ctdbd_migrate: Sending ctdb packet\n"));
1366         ctdb_packet_dump(&req.hdr);
1367
1368         iov[0].iov_base = &req;
1369         iov[0].iov_len = offsetof(struct ctdb_req_call, data);
1370         iov[1].iov_base = key.dptr;
1371         iov[1].iov_len = key.dsize;
1372
1373         nwritten = write_data_iov(conn->fd, iov, ARRAY_SIZE(iov));
1374         if (nwritten == -1) {
1375                 DEBUG(3, ("write_data_iov failed: %s\n", strerror(errno)));
1376                 cluster_fatal("cluster dispatch daemon msg write error\n");
1377         }
1378
1379         status = ctdb_read_req(conn, req.hdr.reqid, NULL, &hdr);
1380
1381         if (!NT_STATUS_IS_OK(status)) {
1382                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1383                 goto fail;
1384         }
1385
1386         if (hdr->operation != CTDB_REPLY_CALL) {
1387                 DEBUG(0, ("received invalid reply\n"));
1388                 status = NT_STATUS_INTERNAL_ERROR;
1389                 goto fail;
1390         }
1391
1392         status = NT_STATUS_OK;
1393  fail:
1394
1395         TALLOC_FREE(hdr);
1396         return status;
1397 }
1398
1399 /*
1400  * Fetch a record and parse it
1401  */
1402 NTSTATUS ctdbd_parse(struct ctdbd_connection *conn, uint32_t db_id,
1403                      TDB_DATA key, bool local_copy,
1404                      void (*parser)(TDB_DATA key, TDB_DATA data,
1405                                     void *private_data),
1406                      void *private_data)
1407 {
1408         struct ctdb_req_call req;
1409         struct ctdb_req_header *hdr = NULL;
1410         struct ctdb_reply_call *reply;
1411         struct iovec iov[2];
1412         ssize_t nwritten;
1413         NTSTATUS status;
1414         uint32_t flags;
1415
1416         flags = local_copy ? CTDB_WANT_READONLY : 0;
1417
1418         ZERO_STRUCT(req);
1419
1420         req.hdr.length = offsetof(struct ctdb_req_call, data) + key.dsize;
1421         req.hdr.ctdb_magic   = CTDB_MAGIC;
1422         req.hdr.ctdb_version = CTDB_VERSION;
1423         req.hdr.operation    = CTDB_REQ_CALL;
1424         req.hdr.reqid        = ctdbd_next_reqid(conn);
1425         req.flags            = flags;
1426         req.callid           = CTDB_FETCH_FUNC;
1427         req.db_id            = db_id;
1428         req.keylen           = key.dsize;
1429
1430         iov[0].iov_base = &req;
1431         iov[0].iov_len = offsetof(struct ctdb_req_call, data);
1432         iov[1].iov_base = key.dptr;
1433         iov[1].iov_len = key.dsize;
1434
1435         nwritten = write_data_iov(conn->fd, iov, ARRAY_SIZE(iov));
1436         if (nwritten == -1) {
1437                 DEBUG(3, ("write_data_iov failed: %s\n", strerror(errno)));
1438                 cluster_fatal("cluster dispatch daemon msg write error\n");
1439         }
1440
1441         status = ctdb_read_req(conn, req.hdr.reqid, NULL, &hdr);
1442
1443         if (!NT_STATUS_IS_OK(status)) {
1444                 DEBUG(0, ("ctdb_read_req failed: %s\n", nt_errstr(status)));
1445                 goto fail;
1446         }
1447
1448         if (hdr->operation != CTDB_REPLY_CALL) {
1449                 DEBUG(0, ("received invalid reply\n"));
1450                 status = NT_STATUS_INTERNAL_ERROR;
1451                 goto fail;
1452         }
1453         reply = (struct ctdb_reply_call *)hdr;
1454
1455         if (reply->datalen == 0) {
1456                 /*
1457                  * Treat an empty record as non-existing
1458                  */
1459                 status = NT_STATUS_NOT_FOUND;
1460                 goto fail;
1461         }
1462
1463         parser(key, make_tdb_data(&reply->data[0], reply->datalen),
1464                private_data);
1465
1466         status = NT_STATUS_OK;
1467  fail:
1468         TALLOC_FREE(hdr);
1469         return status;
1470 }
1471
1472 /*
1473   Traverse a ctdb database. This uses a kind-of hackish way to open a second
1474   connection to ctdbd to avoid the hairy recursive and async problems with
1475   everything in-line.
1476 */
1477
1478 NTSTATUS ctdbd_traverse(uint32_t db_id,
1479                         void (*fn)(TDB_DATA key, TDB_DATA data,
1480                                    void *private_data),
1481                         void *private_data)
1482 {
1483         struct ctdbd_connection *conn;
1484         NTSTATUS status;
1485
1486         TDB_DATA key, data;
1487         struct ctdb_traverse_start t;
1488         int cstatus;
1489
1490         become_root();
1491         status = ctdbd_init_connection(NULL, &conn);
1492         unbecome_root();
1493         if (!NT_STATUS_IS_OK(status)) {
1494                 DEBUG(0, ("ctdbd_init_connection failed: %s\n",
1495                           nt_errstr(status)));
1496                 return status;
1497         }
1498
1499         t.db_id = db_id;
1500         t.srvid = conn->rand_srvid;
1501         t.reqid = ctdbd_next_reqid(conn);
1502
1503         data.dptr = (uint8_t *)&t;
1504         data.dsize = sizeof(t);
1505
1506         status = ctdbd_control(conn, CTDB_CURRENT_NODE,
1507                                CTDB_CONTROL_TRAVERSE_START, conn->rand_srvid, 0,
1508                                data, NULL, NULL, &cstatus);
1509
1510         if (!NT_STATUS_IS_OK(status) || (cstatus != 0)) {
1511
1512                 DEBUG(0,("ctdbd_control failed: %s, %d\n", nt_errstr(status),
1513                          cstatus));
1514
1515                 if (NT_STATUS_IS_OK(status)) {
1516                         /*
1517                          * We need a mapping here
1518                          */
1519                         status = NT_STATUS_UNSUCCESSFUL;
1520                 }
1521                 TALLOC_FREE(conn);
1522                 return status;
1523         }
1524
1525         while (True) {
1526                 struct ctdb_req_header *hdr;
1527                 struct ctdb_req_message *m;
1528                 struct ctdb_rec_data *d;
1529
1530                 status = ctdb_read_packet(conn->fd, conn, &hdr);
1531                 if (!NT_STATUS_IS_OK(status)) {
1532                         DEBUG(0, ("ctdb_read_packet failed: %s\n",
1533                                   nt_errstr(status)));
1534                         cluster_fatal("ctdbd died\n");
1535                 }
1536
1537                 if (hdr->operation != CTDB_REQ_MESSAGE) {
1538                         DEBUG(0, ("Got operation %u, expected a message\n",
1539                                   (unsigned)hdr->operation));
1540                         TALLOC_FREE(conn);
1541                         return NT_STATUS_UNEXPECTED_IO_ERROR;
1542                 }
1543
1544                 m = (struct ctdb_req_message *)hdr;
1545                 d = (struct ctdb_rec_data *)&m->data[0];
1546                 if (m->datalen < sizeof(uint32_t) || m->datalen != d->length) {
1547                         DEBUG(0, ("Got invalid traverse data of length %d\n",
1548                                   (int)m->datalen));
1549                         TALLOC_FREE(conn);
1550                         return NT_STATUS_UNEXPECTED_IO_ERROR;
1551                 }
1552
1553                 key.dsize = d->keylen;
1554                 key.dptr  = &d->data[0];
1555                 data.dsize = d->datalen;
1556                 data.dptr = &d->data[d->keylen];
1557
1558                 if (key.dsize == 0 && data.dsize == 0) {
1559                         /* end of traverse */
1560                         TALLOC_FREE(conn);
1561                         return NT_STATUS_OK;
1562                 }
1563
1564                 if (data.dsize < sizeof(struct ctdb_ltdb_header)) {
1565                         DEBUG(0, ("Got invalid ltdb header length %d\n",
1566                                   (int)data.dsize));
1567                         TALLOC_FREE(conn);
1568                         return NT_STATUS_UNEXPECTED_IO_ERROR;
1569                 }
1570                 data.dsize -= sizeof(struct ctdb_ltdb_header);
1571                 data.dptr += sizeof(struct ctdb_ltdb_header);
1572
1573                 if (fn != NULL) {
1574                         fn(key, data, private_data);
1575                 }
1576         }
1577         return NT_STATUS_OK;
1578 }
1579
1580 /*
1581    This is used to canonicalize a ctdb_sock_addr structure.
1582 */
1583 static void smbd_ctdb_canonicalize_ip(const struct sockaddr_storage *in,
1584                                       struct sockaddr_storage *out)
1585 {
1586         memcpy(out, in, sizeof (*out));
1587
1588 #ifdef HAVE_IPV6
1589         if (in->ss_family == AF_INET6) {
1590                 const char prefix[12] = { 0,0,0,0,0,0,0,0,0,0,0xff,0xff };
1591                 const struct sockaddr_in6 *in6 =
1592                         (const struct sockaddr_in6 *)in;
1593                 struct sockaddr_in *out4 = (struct sockaddr_in *)out;
1594                 if (memcmp(&in6->sin6_addr, prefix, 12) == 0) {
1595                         memset(out, 0, sizeof(*out));
1596 #ifdef HAVE_SOCK_SIN_LEN
1597                         out4->sin_len = sizeof(*out);
1598 #endif
1599                         out4->sin_family = AF_INET;
1600                         out4->sin_port   = in6->sin6_port;
1601                         memcpy(&out4->sin_addr, &in6->sin6_addr.s6_addr[12], 4);
1602                 }
1603         }
1604 #endif
1605 }
1606
1607 /*
1608  * Register us as a server for a particular tcp connection
1609  */
1610
1611 NTSTATUS ctdbd_register_ips(struct ctdbd_connection *conn,
1612                             const struct sockaddr_storage *_server,
1613                             const struct sockaddr_storage *_client,
1614                             bool (*release_ip_handler)(const char *ip_addr,
1615                                                        void *private_data),
1616                             void *private_data)
1617 {
1618         /*
1619          * we still use ctdb_control_tcp for ipv4
1620          * because we want to work against older ctdb
1621          * versions at runtime
1622          */
1623         struct ctdb_control_tcp p4;
1624         struct ctdb_control_tcp_addr p;
1625         TDB_DATA data;
1626         NTSTATUS status;
1627         struct sockaddr_storage client;
1628         struct sockaddr_storage server;
1629
1630         /*
1631          * Only one connection so far
1632          */
1633         SMB_ASSERT(conn->release_ip_handler == NULL);
1634
1635         smbd_ctdb_canonicalize_ip(_client, &client);
1636         smbd_ctdb_canonicalize_ip(_server, &server);
1637
1638         switch (client.ss_family) {
1639         case AF_INET:
1640                 memcpy(&p4.dest, &server, sizeof(p4.dest));
1641                 memcpy(&p4.src, &client, sizeof(p4.src));
1642                 data.dptr = (uint8_t *)&p4;
1643                 data.dsize = sizeof(p4);
1644                 break;
1645         case AF_INET6:
1646                 memcpy(&p.dest.ip6, &server, sizeof(p.dest.ip6));
1647                 memcpy(&p.src.ip6, &client, sizeof(p.src.ip6));
1648                 data.dptr = (uint8_t *)&p;
1649                 data.dsize = sizeof(p);
1650                 break;
1651         default:
1652                 return NT_STATUS_INTERNAL_ERROR;
1653         }
1654
1655         conn->release_ip_handler = release_ip_handler;
1656         conn->release_ip_priv = private_data;
1657
1658         /*
1659          * We want to be told about IP releases
1660          */
1661
1662         status = register_with_ctdbd(conn, CTDB_SRVID_RELEASE_IP);
1663         if (!NT_STATUS_IS_OK(status)) {
1664                 return status;
1665         }
1666
1667         /*
1668          * inform ctdb of our tcp connection, so if IP takeover happens ctdb
1669          * can send an extra ack to trigger a reset for our client, so it
1670          * immediately reconnects
1671          */
1672         return ctdbd_control(conn, CTDB_CURRENT_NODE,
1673                              CTDB_CONTROL_TCP_CLIENT, 0,
1674                              CTDB_CTRL_FLAG_NOREPLY, data, NULL, NULL, NULL);
1675 }
1676
1677 /*
1678  * We want to handle reconfigure events
1679  */
1680 NTSTATUS ctdbd_register_reconfigure(struct ctdbd_connection *conn)
1681 {
1682         return register_with_ctdbd(conn, CTDB_SRVID_RECONFIGURE);
1683 }
1684
1685 /*
1686   call a control on the local node
1687  */
1688 NTSTATUS ctdbd_control_local(struct ctdbd_connection *conn, uint32_t opcode,
1689                              uint64_t srvid, uint32_t flags, TDB_DATA data,
1690                              TALLOC_CTX *mem_ctx, TDB_DATA *outdata,
1691                              int *cstatus)
1692 {
1693         return ctdbd_control(conn, CTDB_CURRENT_NODE, opcode, srvid, flags, data, mem_ctx, outdata, cstatus);
1694 }
1695
1696 NTSTATUS ctdb_watch_us(struct ctdbd_connection *conn)
1697 {
1698         struct ctdb_client_notify_register reg_data;
1699         size_t struct_len;
1700         NTSTATUS status;
1701         int cstatus;
1702
1703         reg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1704         reg_data.len = 1;
1705         reg_data.notify_data[0] = 0;
1706
1707         struct_len = offsetof(struct ctdb_client_notify_register,
1708                               notify_data) + reg_data.len;
1709
1710         status = ctdbd_control_local(
1711                 conn, CTDB_CONTROL_REGISTER_NOTIFY, conn->rand_srvid, 0,
1712                 make_tdb_data((uint8_t *)&reg_data, struct_len),
1713                 NULL, NULL, &cstatus);
1714         if (!NT_STATUS_IS_OK(status)) {
1715                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1716                           nt_errstr(status)));
1717         }
1718         return status;
1719 }
1720
1721 NTSTATUS ctdb_unwatch(struct ctdbd_connection *conn)
1722 {
1723         struct ctdb_client_notify_deregister dereg_data;
1724         NTSTATUS status;
1725         int cstatus;
1726
1727         dereg_data.srvid = CTDB_SRVID_SAMBA_NOTIFY;
1728
1729         status = ctdbd_control_local(
1730                 conn, CTDB_CONTROL_DEREGISTER_NOTIFY, conn->rand_srvid, 0,
1731                 make_tdb_data((uint8_t *)&dereg_data, sizeof(dereg_data)),
1732                 NULL, NULL, &cstatus);
1733         if (!NT_STATUS_IS_OK(status)) {
1734                 DEBUG(1, ("ctdbd_control_local failed: %s\n",
1735                           nt_errstr(status)));
1736         }
1737         return status;
1738 }
1739
1740 NTSTATUS ctdbd_probe(void)
1741 {
1742         /*
1743          * Do a very early check if ctdbd is around to avoid an abort and core
1744          * later
1745          */
1746         struct ctdbd_connection *conn = NULL;
1747         NTSTATUS status;
1748
1749         status = ctdbd_messaging_connection(talloc_tos(), &conn);
1750
1751         /*
1752          * We only care if we can connect.
1753          */
1754         TALLOC_FREE(conn);
1755
1756         return status;
1757 }