source3/rpc_server/mdssd.c

   1 /*
   2  *  Unix SMB/CIFS implementation.
   3  *
   4  *  mds service daemon
   5  *
   6  *  Copyright (c) 2014      Ralph Boehme <rb@sernet.de>
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 3 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22 #include "includes.h"
  23 #include "serverid.h"
  24 #include "messages.h"
  25 #include "ntdomain.h"
  26
  27 #include "lib/util/util_process.h"
  28
  29 #include "lib/id_cache.h"
  30
  31 #include "../lib/tsocket/tsocket.h"
  32 #include "lib/server_prefork.h"
  33 #include "lib/server_prefork_util.h"
  34 #include "librpc/rpc/dcerpc_ep.h"
  35
  36 #include "rpc_server/rpc_server.h"
  37 #include "rpc_server/rpc_ep_register.h"
  38 #include "rpc_server/rpc_sock_helper.h"
  39
  40 #include "librpc/gen_ndr/srv_mdssvc.h"
  41 #include "rpc_server/mdssvc/srv_mdssvc_nt.h"
  42
  43 #undef DBGC_CLASS
  44 #define DBGC_CLASS DBGC_RPC_SRV
  45
  46 #define DAEMON_NAME "mdssd"
  47 #define MDSSD_MAX_SOCKETS 64
  48
  49 static struct server_id parent_id;
  50 static struct prefork_pool *mdssd_pool = NULL;
  51 static int mdssd_child_id = 0;
  52
  53 static struct pf_daemon_config default_pf_mdssd_cfg = {
  54         .prefork_status = PFH_INIT,
  55         .min_children = 5,
  56         .max_children = 25,
  57         .spawn_rate = 5,
  58         .max_allowed_clients = 1000,
  59         .child_min_life = 60 /* 1 minute minimum life time */
  60 };
  61 static struct pf_daemon_config pf_mdssd_cfg = { 0 };
  62
  63 void start_mdssd(struct tevent_context *ev_ctx,
  64                  struct messaging_context *msg_ctx);
  65
  66 static void mdssd_smb_conf_updated(struct messaging_context *msg,
  67                                    void *private_data,
  68                                    uint32_t msg_type,
  69                                    struct server_id server_id,
  70                                    DATA_BLOB *data)
  71 {
  72         struct tevent_context *ev_ctx;
  73
  74         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
  75         ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
  76
  77         change_to_root_user();
  78         lp_load_global(get_dyn_CONFIGFILE());
  79
  80         reopen_logs();
  81         if (mdssd_child_id == 0) {
  82                 pfh_daemon_config(DAEMON_NAME,
  83                                   &pf_mdssd_cfg,
  84                                   &default_pf_mdssd_cfg);
  85                 pfh_manage_pool(ev_ctx, msg, &pf_mdssd_cfg, mdssd_pool);
  86         }
  87 }
  88
  89 static void mdssd_sig_term_handler(struct tevent_context *ev,
  90                                    struct tevent_signal *se,
  91                                    int signum,
  92                                    int count,
  93                                    void *siginfo,
  94                                    void *private_data)
  95 {
  96         rpc_mdssvc_shutdown();
  97
  98         DEBUG(0, ("termination signal\n"));
  99         exit(0);
 100 }
 101
 102 static void mdssd_setup_sig_term_handler(struct tevent_context *ev_ctx)
 103 {
 104         struct tevent_signal *se;
 105
 106         se = tevent_add_signal(ev_ctx,
 107                                ev_ctx,
 108                                SIGTERM, 0,
 109                                mdssd_sig_term_handler,
 110                                NULL);
 111         if (!se) {
 112                 DEBUG(0, ("failed to setup SIGTERM handler\n"));
 113                 exit(1);
 114         }
 115 }
 116
 117 static void mdssd_sig_hup_handler(struct tevent_context *ev,
 118                                   struct tevent_signal *se,
 119                                   int signum,
 120                                   int count,
 121                                   void *siginfo,
 122                                   void *pvt)
 123 {
 124
 125         change_to_root_user();
 126         lp_load_global(get_dyn_CONFIGFILE());
 127
 128         reopen_logs();
 129         pfh_daemon_config(DAEMON_NAME,
 130                           &pf_mdssd_cfg,
 131                           &default_pf_mdssd_cfg);
 132
 133         /* relay to all children */
 134         prefork_send_signal_to_all(mdssd_pool, SIGHUP);
 135 }
 136
 137 static void mdssd_setup_sig_hup_handler(struct tevent_context *ev_ctx)
 138 {
 139         struct tevent_signal *se;
 140
 141         se = tevent_add_signal(ev_ctx,
 142                                ev_ctx,
 143                                SIGHUP, 0,
 144                                mdssd_sig_hup_handler,
 145                                NULL);
 146         if (!se) {
 147                 DEBUG(0, ("failed to setup SIGHUP handler\n"));
 148                 exit(1);
 149         }
 150 }
 151
 152 /**********************************************************
 153  * Children
 154  **********************************************************/
 155
 156 static void mdssd_chld_sig_hup_handler(struct tevent_context *ev,
 157                                        struct tevent_signal *se,
 158                                        int signum,
 159                                        int count,
 160                                        void *siginfo,
 161                                        void *pvt)
 162 {
 163         change_to_root_user();
 164         reopen_logs();
 165 }
 166
 167 static bool mdssd_setup_chld_hup_handler(struct tevent_context *ev_ctx)
 168 {
 169         struct tevent_signal *se;
 170
 171         se = tevent_add_signal(ev_ctx,
 172                                ev_ctx,
 173                                SIGHUP, 0,
 174                                mdssd_chld_sig_hup_handler,
 175                                NULL);
 176         if (!se) {
 177                 DEBUG(1, ("failed to setup SIGHUP handler"));
 178                 return false;
 179         }
 180
 181         return true;
 182 }
 183
 184 static void parent_ping(struct messaging_context *msg_ctx,
 185                         void *private_data,
 186                         uint32_t msg_type,
 187                         struct server_id server_id,
 188                         DATA_BLOB *data)
 189 {
 190         /*
 191          * The fact we received this message is enough to let make the
 192          * event loop if it was idle. mdssd_children_main will cycle
 193          * through mdssd_next_client at least once. That function will
 194          * take whatever action is necessary
 195          */
 196         DEBUG(10, ("Got message that the parent changed status.\n"));
 197         return;
 198 }
 199
 200 static bool mdssd_child_init(struct tevent_context *ev_ctx,
 201                              int child_id,
 202                              struct pf_worker_data *pf)
 203 {
 204         NTSTATUS status;
 205         struct messaging_context *msg_ctx = server_messaging_context();
 206         bool ok;
 207
 208         status = reinit_after_fork(msg_ctx, ev_ctx,
 209                                    true);
 210         if (!NT_STATUS_IS_OK(status)) {
 211                 DEBUG(0,("reinit_after_fork() failed\n"));
 212                 smb_panic("reinit_after_fork() failed");
 213         }
 214
 215         prctl_set_comment("mdssd-child");
 216
 217         mdssd_child_id = child_id;
 218         reopen_logs();
 219
 220         ok = mdssd_setup_chld_hup_handler(ev_ctx);
 221         if (!ok) {
 222                 return false;
 223         }
 224
 225         if (!serverid_register(messaging_server_id(msg_ctx),
 226                                FLAG_MSG_GENERAL)) {
 227                 return false;
 228         }
 229
 230         messaging_register(msg_ctx, ev_ctx,
 231                            MSG_SMB_CONF_UPDATED, mdssd_smb_conf_updated);
 232         messaging_register(msg_ctx, ev_ctx,
 233                            MSG_PREFORK_PARENT_EVENT, parent_ping);
 234
 235         status = rpc_mdssvc_init(NULL);
 236         if (!NT_STATUS_IS_OK(status)) {
 237                 DEBUG(0, ("Failed to intialize RPC: %s\n",
 238                           nt_errstr(status)));
 239                 return false;
 240         }
 241
 242         return true;
 243 }
 244
 245 struct mdssd_children_data {
 246         struct tevent_context *ev_ctx;
 247         struct messaging_context *msg_ctx;
 248         struct pf_worker_data *pf;
 249         int listen_fd_size;
 250         int *listen_fds;
 251 };
 252
 253 static void mdssd_next_client(void *pvt);
 254
 255 static int mdssd_children_main(struct tevent_context *ev_ctx,
 256                                struct messaging_context *msg_ctx,
 257                                struct pf_worker_data *pf,
 258                                int child_id,
 259                                int listen_fd_size,
 260                                int *listen_fds,
 261                                void *private_data)
 262 {
 263         struct mdssd_children_data *data;
 264         bool ok;
 265         int ret = 0;
 266
 267         ok = mdssd_child_init(ev_ctx, child_id, pf);
 268         if (!ok) {
 269                 return 1;
 270         }
 271
 272         data = talloc(ev_ctx, struct mdssd_children_data);
 273         if (!data) {
 274                 return 1;
 275         }
 276         data->pf = pf;
 277         data->ev_ctx = ev_ctx;
 278         data->msg_ctx = msg_ctx;
 279         data->listen_fd_size = listen_fd_size;
 280         data->listen_fds = listen_fds;
 281
 282         /* loop until it is time to exit */
 283         while (pf->status != PF_WORKER_EXITING) {
 284                 /* try to see if it is time to schedule the next client */
 285                 mdssd_next_client(data);
 286
 287                 ret = tevent_loop_once(ev_ctx);
 288                 if (ret != 0) {
 289                         DEBUG(0, ("tevent_loop_once() exited with %d: %s\n",
 290                                   ret, strerror(errno)));
 291                         pf->status = PF_WORKER_EXITING;
 292                 }
 293         }
 294
 295         return ret;
 296 }
 297
 298 static void mdssd_client_terminated(void *pvt)
 299 {
 300         struct mdssd_children_data *data;
 301
 302         data = talloc_get_type_abort(pvt, struct mdssd_children_data);
 303
 304         pfh_client_terminated(data->pf);
 305
 306         mdssd_next_client(pvt);
 307 }
 308
 309 struct mdssd_new_client {
 310         struct mdssd_children_data *data;
 311 };
 312
 313 static void mdssd_handle_client(struct tevent_req *req);
 314
 315 static void mdssd_next_client(void *pvt)
 316 {
 317         struct tevent_req *req;
 318         struct mdssd_children_data *data;
 319         struct mdssd_new_client *next;
 320
 321         data = talloc_get_type_abort(pvt, struct mdssd_children_data);
 322
 323         if (!pfh_child_allowed_to_accept(data->pf)) {
 324                 /* nothing to do for now we are already listening
 325                  * or we are not allowed to listen further */
 326                 return;
 327         }
 328
 329         next = talloc_zero(data, struct mdssd_new_client);
 330         if (!next) {
 331                 DEBUG(1, ("Out of memory!?\n"));
 332                 return;
 333         }
 334         next->data = data;
 335
 336         req = prefork_listen_send(next,
 337                                   data->ev_ctx,
 338                                   data->pf,
 339                                   data->listen_fd_size,
 340                                   data->listen_fds);
 341         if (!req) {
 342                 DEBUG(1, ("Failed to make listening request!?\n"));
 343                 talloc_free(next);
 344                 return;
 345         }
 346         tevent_req_set_callback(req, mdssd_handle_client, next);
 347 }
 348
 349 static void mdssd_handle_client(struct tevent_req *req)
 350 {
 351         struct mdssd_children_data *data;
 352         struct mdssd_new_client *client;
 353         const DATA_BLOB ping = data_blob_null;
 354         int rc;
 355         int sd;
 356         TALLOC_CTX *tmp_ctx;
 357         struct tsocket_address *srv_addr;
 358         struct tsocket_address *cli_addr;
 359
 360         client = tevent_req_callback_data(req, struct mdssd_new_client);
 361         data = client->data;
 362
 363         tmp_ctx = talloc_stackframe();
 364         if (tmp_ctx == NULL) {
 365                 DEBUG(1, ("Failed to allocate stackframe!\n"));
 366                 return;
 367         }
 368
 369         rc = prefork_listen_recv(req,
 370                                  tmp_ctx,
 371                                  &sd,
 372                                  &srv_addr,
 373                                  &cli_addr);
 374
 375         /* this will free the request too */
 376         talloc_free(client);
 377
 378         if (rc != 0) {
 379                 DEBUG(6, ("No client connection was available after all!\n"));
 380                 goto done;
 381         }
 382
 383         /* Warn parent that our status changed */
 384         messaging_send(data->msg_ctx, parent_id,
 385                         MSG_PREFORK_CHILD_EVENT, &ping);
 386
 387         DEBUG(2, ("mdssd preforked child %d got client connection!\n",
 388                   (int)(data->pf->pid)));
 389
 390         if (tsocket_address_is_inet(srv_addr, "ip")) {
 391                 DEBUG(3, ("Got a tcpip client connection from %s on inteface %s\n",
 392                            tsocket_address_string(cli_addr, tmp_ctx),
 393                            tsocket_address_string(srv_addr, tmp_ctx)));
 394
 395                 dcerpc_ncacn_accept(data->ev_ctx,
 396                                     data->msg_ctx,
 397                                     NCACN_IP_TCP,
 398                                     "IP",
 399                                     cli_addr,
 400                                     srv_addr,
 401                                     sd,
 402                                     NULL);
 403         } else if (tsocket_address_is_unix(srv_addr)) {
 404                 const char *p;
 405                 const char *b;
 406
 407                 p = tsocket_address_unix_path(srv_addr, tmp_ctx);
 408                 if (p == NULL) {
 409                         talloc_free(tmp_ctx);
 410                         return;
 411                 }
 412
 413                 b = strrchr(p, '/');
 414                 if (b != NULL) {
 415                         b++;
 416                 } else {
 417                         b = p;
 418                 }
 419
 420                 if (strstr(p, "/np/")) {
 421                         named_pipe_accept_function(data->ev_ctx,
 422                                                    data->msg_ctx,
 423                                                    b,
 424                                                    sd,
 425                                                    mdssd_client_terminated,
 426                                                    data);
 427                 } else {
 428                         dcerpc_ncacn_accept(data->ev_ctx,
 429                                             data->msg_ctx,
 430                                             NCALRPC,
 431                                             b,
 432                                             cli_addr,
 433                                             srv_addr,
 434                                             sd,
 435                                             NULL);
 436                 }
 437         } else {
 438                 DEBUG(0, ("ERROR: Unsupported socket!\n"));
 439         }
 440
 441 done:
 442         talloc_free(tmp_ctx);
 443 }
 444
 445 /*
 446  * MAIN
 447  */
 448
 449 static void child_ping(struct messaging_context *msg_ctx,
 450                         void *private_data,
 451                         uint32_t msg_type,
 452                         struct server_id server_id,
 453                         DATA_BLOB *data)
 454 {
 455         struct tevent_context *ev_ctx;
 456
 457         ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
 458
 459         DEBUG(10, ("Got message that a child changed status.\n"));
 460         pfh_manage_pool(ev_ctx, msg_ctx, &pf_mdssd_cfg, mdssd_pool);
 461 }
 462
 463 static bool mdssd_schedule_check(struct tevent_context *ev_ctx,
 464                                  struct messaging_context *msg_ctx,
 465                                  struct timeval current_time);
 466
 467 static void mdssd_check_children(struct tevent_context *ev_ctx,
 468                                     struct tevent_timer *te,
 469                                     struct timeval current_time,
 470                                     void *pvt);
 471
 472 static void mdssd_sigchld_handler(struct tevent_context *ev_ctx,
 473                                   struct prefork_pool *pfp,
 474                                   void *pvt)
 475 {
 476         struct messaging_context *msg_ctx;
 477
 478         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 479
 480         /* run pool management so we can fork/retire or increase
 481          * the allowed connections per child based on load */
 482         pfh_manage_pool(ev_ctx, msg_ctx, &pf_mdssd_cfg, mdssd_pool);
 483 }
 484
 485 static bool mdssd_setup_children_monitor(struct tevent_context *ev_ctx,
 486                                          struct messaging_context *msg_ctx)
 487 {
 488         bool ok;
 489
 490         /* add our oun sigchld callback */
 491         prefork_set_sigchld_callback(mdssd_pool, mdssd_sigchld_handler, msg_ctx);
 492
 493         ok = mdssd_schedule_check(ev_ctx, msg_ctx, tevent_timeval_current());
 494
 495         return ok;
 496 }
 497
 498 static bool mdssd_schedule_check(struct tevent_context *ev_ctx,
 499                                  struct messaging_context *msg_ctx,
 500                                  struct timeval current_time)
 501 {
 502         struct tevent_timer *te;
 503         struct timeval next_event;
 504
 505         /* check situation again in 10 seconds */
 506         next_event = tevent_timeval_current_ofs(10, 0);
 507
 508         /* TODO: check when the socket becomes readable, so that children
 509          * are checked only when there is some activity ? */
 510         te = tevent_add_timer(ev_ctx, mdssd_pool, next_event,
 511                               mdssd_check_children, msg_ctx);
 512         if (!te) {
 513                 DEBUG(2, ("Failed to set up children monitoring!\n"));
 514                 return false;
 515         }
 516
 517         return true;
 518 }
 519
 520 static void mdssd_check_children(struct tevent_context *ev_ctx,
 521                                  struct tevent_timer *te,
 522                                  struct timeval current_time,
 523                                  void *pvt)
 524 {
 525         struct messaging_context *msg_ctx;
 526
 527         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 528
 529         pfh_manage_pool(ev_ctx, msg_ctx, &pf_mdssd_cfg, mdssd_pool);
 530
 531         mdssd_schedule_check(ev_ctx, msg_ctx, current_time);
 532 }
 533
 534 /*
 535  * start it up
 536  */
 537
 538 static bool mdssd_create_sockets(struct tevent_context *ev_ctx,
 539                                  struct messaging_context *msg_ctx,
 540                                  int *listen_fd,
 541                                  int *listen_fd_size)
 542 {
 543         struct dcerpc_binding_vector *v, *v_orig;
 544         TALLOC_CTX *tmp_ctx;
 545         NTSTATUS status;
 546         int fd = -1;
 547         int rc;
 548         bool ok = false;
 549
 550         tmp_ctx = talloc_stackframe();
 551         if (tmp_ctx == NULL) {
 552                 return false;
 553         }
 554
 555         status = dcerpc_binding_vector_new(tmp_ctx, &v_orig);
 556         if (!NT_STATUS_IS_OK(status)) {
 557                 goto done;
 558         }
 559
 560         /* mdssvc */
 561         fd = create_named_pipe_socket("mdssvc");
 562         if (fd < 0) {
 563                 goto done;
 564         }
 565
 566         rc = listen(fd, pf_mdssd_cfg.max_allowed_clients);
 567         if (rc == -1) {
 568                 goto done;
 569         }
 570         listen_fd[*listen_fd_size] = fd;
 571         (*listen_fd_size)++;
 572
 573         fd = create_dcerpc_ncalrpc_socket("mdssvc");
 574         if (fd < 0) {
 575                 goto done;
 576         }
 577
 578         rc = listen(fd, pf_mdssd_cfg.max_allowed_clients);
 579         if (rc == -1) {
 580                 goto done;
 581         }
 582         listen_fd[*listen_fd_size] = fd;
 583         (*listen_fd_size)++;
 584         fd = -1;
 585
 586         v = dcerpc_binding_vector_dup(tmp_ctx, v_orig);
 587         if (v == NULL) {
 588                 goto done;
 589         }
 590
 591         status = dcerpc_binding_vector_replace_iface(&ndr_table_mdssvc, v);
 592         if (!NT_STATUS_IS_OK(status)) {
 593                 goto done;
 594         }
 595
 596         status = dcerpc_binding_vector_add_np_default(&ndr_table_mdssvc, v);
 597         if (!NT_STATUS_IS_OK(status)) {
 598                 goto done;
 599         }
 600
 601         status = dcerpc_binding_vector_add_unix(&ndr_table_mdssvc, v, "mdssvc");
 602         if (!NT_STATUS_IS_OK(status)) {
 603                 goto done;
 604         }
 605
 606         ok = true;
 607 done:
 608         if (fd != -1) {
 609                 close(fd);
 610         }
 611         talloc_free(tmp_ctx);
 612         return ok;
 613 }
 614
 615 static bool mdssvc_init_cb(void *ptr)
 616 {
 617         struct messaging_context *msg_ctx =
 618                 talloc_get_type_abort(ptr, struct messaging_context);
 619         bool ok;
 620
 621         ok = init_service_mdssvc(msg_ctx);
 622         if (!ok) {
 623                 return false;
 624         }
 625
 626         return true;
 627 }
 628
 629 static bool mdssvc_shutdown_cb(void *ptr)
 630 {
 631         shutdown_service_mdssvc();
 632
 633         return true;
 634 }
 635
 636 void start_mdssd(struct tevent_context *ev_ctx,
 637                  struct messaging_context *msg_ctx)
 638 {
 639         NTSTATUS status;
 640         int listen_fd[MDSSD_MAX_SOCKETS];
 641         int listen_fd_size = 0;
 642         pid_t pid;
 643         int rc;
 644         bool ok;
 645         struct rpc_srv_callbacks mdssvc_cb;
 646
 647         DEBUG(1, ("Forking Metadata Service Daemon\n"));
 648
 649         /*
 650          * Block signals before forking child as it will have to
 651          * set its own handlers. Child will re-enable SIGHUP as
 652          * soon as the handlers are set up.
 653          */
 654         BlockSignals(true, SIGTERM);
 655         BlockSignals(true, SIGHUP);
 656
 657         pid = fork();
 658         if (pid == -1) {
 659                 DEBUG(0, ("Failed to fork mdssd [%s], aborting ...\n",
 660                            strerror(errno)));
 661                 exit(1);
 662         }
 663
 664         /* parent or error */
 665         if (pid != 0) {
 666
 667                 /* Re-enable SIGHUP before returnig */
 668                 BlockSignals(false, SIGTERM);
 669                 BlockSignals(false, SIGHUP);
 670
 671                 return;
 672         }
 673
 674         status = reinit_after_fork(msg_ctx,
 675                                    ev_ctx,
 676                                    true);
 677         if (!NT_STATUS_IS_OK(status)) {
 678                 DEBUG(0,("reinit_after_fork() failed\n"));
 679                 smb_panic("reinit_after_fork() failed");
 680         }
 681
 682         prctl_set_comment("mdssd-master");
 683         reopen_logs();
 684
 685         /* save the parent process id so the children can use it later */
 686         parent_id = messaging_server_id(msg_ctx);
 687
 688         pfh_daemon_config(DAEMON_NAME,
 689                           &pf_mdssd_cfg,
 690                           &default_pf_mdssd_cfg);
 691
 692         mdssd_setup_sig_term_handler(ev_ctx);
 693         mdssd_setup_sig_hup_handler(ev_ctx);
 694
 695         BlockSignals(false, SIGTERM);
 696         BlockSignals(false, SIGHUP);
 697
 698         ok = mdssd_create_sockets(ev_ctx, msg_ctx, listen_fd, &listen_fd_size);
 699         if (!ok) {
 700                 exit(1);
 701         }
 702
 703         /* start children before any more initialization is done */
 704         ok = prefork_create_pool(ev_ctx, /* mem_ctx */
 705                                  ev_ctx,
 706                                  msg_ctx,
 707                                  listen_fd_size,
 708                                  listen_fd,
 709                                  pf_mdssd_cfg.min_children,
 710                                  pf_mdssd_cfg.max_children,
 711                                  &mdssd_children_main,
 712                                  NULL,
 713                                  &mdssd_pool);
 714         if (!ok) {
 715                 exit(1);
 716         }
 717
 718         if (!serverid_register(messaging_server_id(msg_ctx),
 719                                FLAG_MSG_GENERAL)) {
 720                 exit(1);
 721         }
 722
 723         messaging_register(msg_ctx,
 724                            ev_ctx,
 725                            MSG_SMB_CONF_UPDATED,
 726                            mdssd_smb_conf_updated);
 727         messaging_register(msg_ctx, ev_ctx,
 728                            MSG_PREFORK_CHILD_EVENT, child_ping);
 729
 730         mdssvc_cb.init         = mdssvc_init_cb;
 731         mdssvc_cb.shutdown     = mdssvc_shutdown_cb;
 732         mdssvc_cb.private_data = msg_ctx;
 733
 734         status = rpc_mdssvc_init(&mdssvc_cb);
 735         if (!NT_STATUS_IS_OK(status)) {
 736                 exit(1);
 737         }
 738
 739         ok = mdssd_setup_children_monitor(ev_ctx, msg_ctx);
 740         if (!ok) {
 741                 exit(1);
 742         }
 743
 744         DEBUG(1, ("mdssd Daemon Started (%u)\n", (unsigned int)getpid()));
 745
 746         /* loop forever */
 747         rc = tevent_loop_wait(ev_ctx);
 748
 749         /* should not be reached */
 750         DEBUG(0,("mdssd: tevent_loop_wait() exited with %d - %s\n",
 751                  rc, (rc == 0) ? "out of events" : strerror(errno)));
 752         exit(1);
 753 }