source3/printing/spoolssd.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    SPOOLSS Daemon
   4    Copyright (C) Simo Sorce <idra@samba.org> 2010-2011
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19 #include "includes.h"
  20 #include "serverid.h"
  21 #include "smbd/smbd.h"
  22
  23 #include "lib/util/util_process.h"
  24
  25 #include "messages.h"
  26 #include "include/printing.h"
  27 #include "printing/nt_printing_migrate_internal.h"
  28 #include "printing/queue_process.h"
  29 #include "printing/pcap.h"
  30 #include "printing/load.h"
  31 #include "ntdomain.h"
  32 #include "librpc/gen_ndr/srv_winreg.h"
  33 #include "librpc/gen_ndr/srv_spoolss.h"
  34 #include "rpc_server/rpc_server.h"
  35 #include "rpc_server/rpc_ep_register.h"
  36 #include "rpc_server/rpc_config.h"
  37 #include "rpc_server/spoolss/srv_spoolss_nt.h"
  38 #include "librpc/rpc/dcerpc_ep.h"
  39 #include "lib/server_prefork.h"
  40 #include "lib/server_prefork_util.h"
  41
  42 #define SPOOLSS_PIPE_NAME "spoolss"
  43 #define DAEMON_NAME "spoolssd"
  44
  45 static struct server_id parent_id;
  46 static struct prefork_pool *spoolss_pool = NULL;
  47 static int spoolss_child_id = 0;
  48
  49 static struct pf_daemon_config default_pf_spoolss_cfg = {
  50         .prefork_status = PFH_INIT,
  51         .min_children = 5,
  52         .max_children = 25,
  53         .spawn_rate = 5,
  54         .max_allowed_clients = 100,
  55         .child_min_life = 60 /* 1 minute minimum life time */
  56 };
  57 static struct pf_daemon_config pf_spoolss_cfg = { 0 };
  58
  59 pid_t start_spoolssd(struct tevent_context *ev_ctx,
  60                      struct messaging_context *msg_ctx);
  61
  62 static void spoolss_reopen_logs(int child_id)
  63 {
  64         char *lfile = lp_logfile(talloc_tos());
  65         char *ext;
  66         int rc;
  67
  68         if (child_id) {
  69                 rc = asprintf(&ext, "%s.%d", DAEMON_NAME, child_id);
  70         } else {
  71                 rc = asprintf(&ext, "%s", DAEMON_NAME);
  72         }
  73
  74         if (rc == -1) {
  75                 return;
  76         }
  77
  78         rc = 0;
  79         if (lfile == NULL || lfile[0] == '\0') {
  80                 rc = asprintf(&lfile, "%s/log.%s",
  81                               get_dyn_LOGFILEBASE(), ext);
  82         } else {
  83                 if (strstr(lfile, ext) == NULL) {
  84                         if (child_id) {
  85                                 rc = asprintf(&lfile, "%s.%d",
  86                                               lp_logfile(talloc_tos()),
  87                                               child_id);
  88                         } else {
  89                                 rc = asprintf(&lfile, "%s.%s",
  90                                               lp_logfile(talloc_tos()),
  91                                               ext);
  92                         }
  93                 }
  94         }
  95
  96         if (rc > 0) {
  97                 lp_set_logfile(lfile);
  98                 SAFE_FREE(lfile);
  99         }
 100
 101         SAFE_FREE(ext);
 102
 103         reopen_logs();
 104 }
 105
 106 static void update_conf(struct tevent_context *ev,
 107                         struct messaging_context *msg)
 108 {
 109         change_to_root_user();
 110         lp_load(get_dyn_CONFIGFILE(), true, false, false, true);
 111         load_printers(ev, msg);
 112
 113         spoolss_reopen_logs(spoolss_child_id);
 114         if (spoolss_child_id == 0) {
 115                 pfh_daemon_config(DAEMON_NAME,
 116                                   &pf_spoolss_cfg,
 117                                   &default_pf_spoolss_cfg);
 118                 pfh_manage_pool(ev, msg, &pf_spoolss_cfg, spoolss_pool);
 119         }
 120 }
 121
 122 static void smb_conf_updated(struct messaging_context *msg,
 123                              void *private_data,
 124                              uint32_t msg_type,
 125                              struct server_id server_id,
 126                              DATA_BLOB *data)
 127 {
 128         struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
 129                                                              struct tevent_context);
 130
 131         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
 132         update_conf(ev_ctx, msg);
 133 }
 134
 135 static void spoolss_sig_term_handler(struct tevent_context *ev,
 136                                      struct tevent_signal *se,
 137                                      int signum,
 138                                      int count,
 139                                      void *siginfo,
 140                                      void *private_data)
 141 {
 142         exit_server_cleanly("termination signal");
 143 }
 144
 145 static void spoolss_setup_sig_term_handler(struct tevent_context *ev_ctx)
 146 {
 147         struct tevent_signal *se;
 148
 149         se = tevent_add_signal(ev_ctx,
 150                                ev_ctx,
 151                                SIGTERM, 0,
 152                                spoolss_sig_term_handler,
 153                                NULL);
 154         if (!se) {
 155                 exit_server("failed to setup SIGTERM handler");
 156         }
 157 }
 158
 159 static void spoolss_sig_hup_handler(struct tevent_context *ev,
 160                                     struct tevent_signal *se,
 161                                     int signum,
 162                                     int count,
 163                                     void *siginfo,
 164                                     void *pvt)
 165 {
 166         struct messaging_context *msg_ctx;
 167
 168         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 169
 170         DEBUG(1,("Reloading printers after SIGHUP\n"));
 171         update_conf(ev, msg_ctx);
 172
 173         /* relay to all children */
 174         if (spoolss_pool) {
 175                 prefork_send_signal_to_all(spoolss_pool, SIGHUP);
 176         }
 177 }
 178
 179 static void spoolss_setup_sig_hup_handler(struct tevent_context *ev_ctx,
 180                                           struct messaging_context *msg_ctx)
 181 {
 182         struct tevent_signal *se;
 183
 184         se = tevent_add_signal(ev_ctx,
 185                                ev_ctx,
 186                                SIGHUP, 0,
 187                                spoolss_sig_hup_handler,
 188                                msg_ctx);
 189         if (!se) {
 190                 exit_server("failed to setup SIGHUP handler");
 191         }
 192 }
 193
 194 static bool spoolss_init_cb(void *ptr)
 195 {
 196         struct messaging_context *msg_ctx = talloc_get_type_abort(
 197                 ptr, struct messaging_context);
 198
 199         return nt_printing_tdb_migrate(msg_ctx);
 200 }
 201
 202 static bool spoolss_shutdown_cb(void *ptr)
 203 {
 204         srv_spoolss_cleanup();
 205
 206         return true;
 207 }
 208
 209 /* Children */
 210
 211 static void spoolss_chld_sig_hup_handler(struct tevent_context *ev,
 212                                          struct tevent_signal *se,
 213                                          int signum,
 214                                          int count,
 215                                          void *siginfo,
 216                                          void *pvt)
 217 {
 218         struct messaging_context *msg_ctx;
 219
 220         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 221
 222         change_to_root_user();
 223         DEBUG(1,("Reloading printers after SIGHUP\n"));
 224         load_printers(ev, msg_ctx);
 225         spoolss_reopen_logs(spoolss_child_id);
 226 }
 227
 228 static bool spoolss_setup_chld_hup_handler(struct tevent_context *ev_ctx,
 229                                            struct messaging_context *msg_ctx,
 230                                            struct pf_worker_data *pf)
 231 {
 232         struct tevent_signal *se;
 233
 234         se = tevent_add_signal(ev_ctx,
 235                                ev_ctx,
 236                                SIGHUP, 0,
 237                                spoolss_chld_sig_hup_handler,
 238                                msg_ctx);
 239         if (!se) {
 240                 DEBUG(1, ("failed to setup SIGHUP handler"));
 241                 return false;
 242         }
 243
 244         return true;
 245 }
 246
 247 static void parent_ping(struct messaging_context *msg_ctx,
 248                         void *private_data,
 249                         uint32_t msg_type,
 250                         struct server_id server_id,
 251                         DATA_BLOB *data)
 252 {
 253
 254         /* The fact we received this message is enough to let make the event
 255          * loop if it was idle. spoolss_children_main will cycle through
 256          * spoolss_next_client at least once. That function will take whatever
 257          * action is necessary */
 258
 259         DEBUG(10, ("Got message that the parent changed status.\n"));
 260         return;
 261 }
 262
 263 static bool spoolss_child_init(struct tevent_context *ev_ctx,
 264                                int child_id, struct pf_worker_data *pf)
 265 {
 266         NTSTATUS status;
 267         struct rpc_srv_callbacks spoolss_cb;
 268         struct messaging_context *msg_ctx = server_messaging_context();
 269         bool ok;
 270
 271         status = reinit_after_fork(msg_ctx, ev_ctx,
 272                                    true);
 273         if (!NT_STATUS_IS_OK(status)) {
 274                 DEBUG(0,("reinit_after_fork() failed\n"));
 275                 smb_panic("reinit_after_fork() failed");
 276         }
 277
 278         prctl_set_comment("spoolssd-child");
 279
 280         spoolss_child_id = child_id;
 281         spoolss_reopen_logs(child_id);
 282
 283         ok = spoolss_setup_chld_hup_handler(ev_ctx, msg_ctx, pf);
 284         if (!ok) {
 285                 return false;
 286         }
 287
 288         if (!serverid_register(messaging_server_id(msg_ctx),
 289                                 FLAG_MSG_GENERAL |
 290                                 FLAG_MSG_PRINT_GENERAL)) {
 291                 return false;
 292         }
 293
 294         if (!locking_init()) {
 295                 return false;
 296         }
 297
 298         messaging_register(msg_ctx, ev_ctx,
 299                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 300         messaging_register(msg_ctx, ev_ctx,
 301                            MSG_PREFORK_PARENT_EVENT, parent_ping);
 302
 303         /* As soon as messaging is up check if pcap has been loaded already.
 304          * If so then we probably missed a message and should load_printers()
 305          * ourselves. If pcap has not been loaded yet, then ignore, we will get
 306          * a message as soon as the bq process completes the reload. */
 307         if (pcap_cache_loaded(NULL)) {
 308                 load_printers(ev_ctx, msg_ctx);
 309         }
 310
 311         /* try to reinit rpc queues */
 312         spoolss_cb.init = spoolss_init_cb;
 313         spoolss_cb.shutdown = spoolss_shutdown_cb;
 314         spoolss_cb.private_data = msg_ctx;
 315
 316         status = rpc_winreg_init(NULL);
 317         if (!NT_STATUS_IS_OK(status)) {
 318                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 319                           nt_errstr(status)));
 320                 return false;
 321         }
 322
 323         status = rpc_spoolss_init(&spoolss_cb);
 324         if (!NT_STATUS_IS_OK(status)) {
 325                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 326                           nt_errstr(status)));
 327                 return false;
 328         }
 329
 330         return true;
 331 }
 332
 333 struct spoolss_children_data {
 334         struct tevent_context *ev_ctx;
 335         struct messaging_context *msg_ctx;
 336         struct pf_worker_data *pf;
 337         int listen_fd_size;
 338         int *listen_fds;
 339 };
 340
 341 static void spoolss_next_client(void *pvt);
 342
 343 static int spoolss_children_main(struct tevent_context *ev_ctx,
 344                                  struct messaging_context *msg_ctx,
 345                                  struct pf_worker_data *pf,
 346                                  int child_id,
 347                                  int listen_fd_size,
 348                                  int *listen_fds,
 349                                  void *private_data)
 350 {
 351         struct spoolss_children_data *data;
 352         bool ok;
 353         int ret = 0;
 354
 355         ok = spoolss_child_init(ev_ctx, child_id, pf);
 356         if (!ok) {
 357                 return 1;
 358         }
 359
 360         data = talloc(ev_ctx, struct spoolss_children_data);
 361         if (!data) {
 362                 return 1;
 363         }
 364         data->pf = pf;
 365         data->ev_ctx = ev_ctx;
 366         data->msg_ctx = msg_ctx;
 367         data->listen_fd_size = listen_fd_size;
 368         data->listen_fds = listen_fds;
 369
 370         /* loop until it is time to exit */
 371         while (pf->status != PF_WORKER_EXITING) {
 372                 /* try to see if it is time to schedule the next client */
 373                 spoolss_next_client(data);
 374
 375                 ret = tevent_loop_once(ev_ctx);
 376                 if (ret != 0) {
 377                         DEBUG(0, ("tevent_loop_once() exited with %d: %s\n",
 378                                   ret, strerror(errno)));
 379                         pf->status = PF_WORKER_EXITING;
 380                 }
 381         }
 382
 383         return ret;
 384 }
 385
 386 static void spoolss_client_terminated(void *pvt)
 387 {
 388         struct spoolss_children_data *data;
 389
 390         data = talloc_get_type_abort(pvt, struct spoolss_children_data);
 391
 392         pfh_client_terminated(data->pf);
 393
 394         spoolss_next_client(pvt);
 395 }
 396
 397 struct spoolss_new_client {
 398         struct spoolss_children_data *data;
 399         struct tsocket_address *srv_addr;
 400         struct tsocket_address *cli_addr;
 401 };
 402
 403 static void spoolss_handle_client(struct tevent_req *req);
 404
 405 static void spoolss_next_client(void *pvt)
 406 {
 407         struct tevent_req *req;
 408         struct spoolss_children_data *data;
 409         struct spoolss_new_client *next;
 410
 411         data = talloc_get_type_abort(pvt, struct spoolss_children_data);
 412
 413         if (!pfh_child_allowed_to_accept(data->pf)) {
 414                 /* nothing to do for now we are already listening
 415                  * or we are not allowed to listen further */
 416                 return;
 417         }
 418
 419         next = talloc_zero(data, struct spoolss_new_client);
 420         if (!next) {
 421                 DEBUG(1, ("Out of memory!?\n"));
 422                 return;
 423         }
 424         next->data = data;
 425
 426         req = prefork_listen_send(next, data->ev_ctx, data->pf,
 427                                   data->listen_fd_size,
 428                                   data->listen_fds);
 429         if (!req) {
 430                 DEBUG(1, ("Failed to make listening request!?\n"));
 431                 talloc_free(next);
 432                 return;
 433         }
 434         tevent_req_set_callback(req, spoolss_handle_client, next);
 435 }
 436
 437 static void spoolss_handle_client(struct tevent_req *req)
 438 {
 439         struct spoolss_children_data *data;
 440         struct spoolss_new_client *client;
 441         const DATA_BLOB ping = data_blob_null;
 442         int ret;
 443         int sd;
 444
 445         client = tevent_req_callback_data(req, struct spoolss_new_client);
 446         data = client->data;
 447
 448         ret = prefork_listen_recv(req, client, &sd,
 449                                   &client->srv_addr, &client->cli_addr);
 450
 451         /* this will free the request too */
 452         talloc_free(client);
 453
 454         if (ret != 0) {
 455                 DEBUG(6, ("No client connection was available after all!\n"));
 456                 return;
 457         }
 458
 459         /* Warn parent that our status changed */
 460         messaging_send(data->msg_ctx, parent_id,
 461                         MSG_PREFORK_CHILD_EVENT, &ping);
 462
 463         DEBUG(2, ("Spoolss preforked child %d got client connection!\n",
 464                   (int)(data->pf->pid)));
 465
 466         named_pipe_accept_function(data->ev_ctx, data->msg_ctx,
 467                                    SPOOLSS_PIPE_NAME, sd,
 468                                    spoolss_client_terminated, data);
 469 }
 470
 471 /* ==== Main Process Functions ==== */
 472
 473 extern pid_t background_lpq_updater_pid;
 474 static char *bq_logfile;
 475
 476 static void check_updater_child(struct tevent_context *ev_ctx,
 477                                 struct messaging_context *msg_ctx)
 478 {
 479         int status;
 480         pid_t pid;
 481
 482         if (background_lpq_updater_pid == -1) {
 483                 return;
 484         }
 485
 486         pid = sys_waitpid(background_lpq_updater_pid, &status, WNOHANG);
 487         if (pid > 0) {
 488                 DEBUG(2, ("The background queue child died... Restarting!\n"));
 489                 pid = start_background_queue(ev_ctx, msg_ctx, bq_logfile);
 490                 background_lpq_updater_pid = pid;
 491         }
 492 }
 493
 494 static void child_ping(struct messaging_context *msg_ctx,
 495                         void *private_data,
 496                         uint32_t msg_type,
 497                         struct server_id server_id,
 498                         DATA_BLOB *data)
 499 {
 500         struct tevent_context *ev_ctx;
 501
 502         ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
 503
 504         DEBUG(10, ("Got message that a child changed status.\n"));
 505         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 506 }
 507
 508 static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
 509                                     struct messaging_context *msg_ctx,
 510                                     struct timeval current_time);
 511 static void spoolssd_check_children(struct tevent_context *ev_ctx,
 512                                     struct tevent_timer *te,
 513                                     struct timeval current_time,
 514                                     void *pvt);
 515
 516 static void spoolssd_sigchld_handler(struct tevent_context *ev_ctx,
 517                                      struct prefork_pool *pfp,
 518                                      void *pvt)
 519 {
 520         struct messaging_context *msg_ctx;
 521
 522         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 523
 524         /* run pool management so we can fork/retire or increase
 525          * the allowed connections per child based on load */
 526         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 527
 528         /* also check if the updater child is alive and well */
 529         check_updater_child(ev_ctx, msg_ctx);
 530 }
 531
 532 static bool spoolssd_setup_children_monitor(struct tevent_context *ev_ctx,
 533                                             struct messaging_context *msg_ctx)
 534 {
 535         bool ok;
 536
 537         /* add our oun sigchld callback */
 538         prefork_set_sigchld_callback(spoolss_pool,
 539                                      spoolssd_sigchld_handler, msg_ctx);
 540
 541         ok = spoolssd_schedule_check(ev_ctx, msg_ctx,
 542                                      tevent_timeval_current());
 543         return ok;
 544 }
 545
 546 static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
 547                                     struct messaging_context *msg_ctx,
 548                                     struct timeval current_time)
 549 {
 550         struct tevent_timer *te;
 551         struct timeval next_event;
 552
 553         /* check situation again in 10 seconds */
 554         next_event = tevent_timeval_current_ofs(10, 0);
 555
 556         /* TODO: check when the socket becomes readable, so that children
 557          * are checked only when there is some activity ? */
 558         te = tevent_add_timer(ev_ctx, spoolss_pool, next_event,
 559                                 spoolssd_check_children, msg_ctx);
 560         if (!te) {
 561                 DEBUG(2, ("Failed to set up children monitoring!\n"));
 562                 return false;
 563         }
 564
 565         return true;
 566 }
 567
 568 static void spoolssd_check_children(struct tevent_context *ev_ctx,
 569                                     struct tevent_timer *te,
 570                                     struct timeval current_time,
 571                                     void *pvt)
 572 {
 573         struct messaging_context *msg_ctx;
 574
 575         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 576
 577         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 578
 579         spoolssd_schedule_check(ev_ctx, msg_ctx, current_time);
 580 }
 581
 582 static void print_queue_forward(struct messaging_context *msg,
 583                                 void *private_data,
 584                                 uint32_t msg_type,
 585                                 struct server_id server_id,
 586                                 DATA_BLOB *data)
 587 {
 588         messaging_send_buf(msg, pid_to_procid(background_lpq_updater_pid),
 589                            MSG_PRINTER_UPDATE, data->data, data->length);
 590 }
 591
 592 static char *get_bq_logfile(void)
 593 {
 594         char *lfile = lp_logfile(talloc_tos());
 595         int rc;
 596
 597         if (lfile == NULL || lfile[0] == '\0') {
 598                 rc = asprintf(&lfile, "%s/log.%s.bq",
 599                                         get_dyn_LOGFILEBASE(), DAEMON_NAME);
 600         } else {
 601                 rc = asprintf(&lfile, "%s.bq", lp_logfile(talloc_tos()));
 602         }
 603         if (rc == -1) {
 604                 lfile = NULL;
 605         }
 606         return lfile;
 607 }
 608
 609 pid_t start_spoolssd(struct tevent_context *ev_ctx,
 610                     struct messaging_context *msg_ctx)
 611 {
 612         enum rpc_service_mode_e epm_mode = rpc_epmapper_mode();
 613         struct rpc_srv_callbacks spoolss_cb;
 614         struct dcerpc_binding_vector *v;
 615         TALLOC_CTX *mem_ctx;
 616         pid_t pid;
 617         NTSTATUS status;
 618         int listen_fd;
 619         int ret;
 620         bool ok;
 621
 622         DEBUG(1, ("Forking SPOOLSS Daemon\n"));
 623
 624         /*
 625          * Block signals before forking child as it will have to
 626          * set its own handlers. Child will re-enable SIGHUP as
 627          * soon as the handlers are set up.
 628          */
 629         BlockSignals(true, SIGTERM);
 630         BlockSignals(true, SIGHUP);
 631
 632         pid = fork();
 633
 634         if (pid == -1) {
 635                 DEBUG(0, ("Failed to fork SPOOLSS [%s]\n",
 636                            strerror(errno)));
 637         }
 638
 639         /* parent or error */
 640         if (pid != 0) {
 641
 642                 /* Re-enable SIGHUP before returnig */
 643                 BlockSignals(false, SIGTERM);
 644                 BlockSignals(false, SIGHUP);
 645                 return pid;
 646         }
 647
 648         status = reinit_after_fork(msg_ctx,
 649                                    ev_ctx,
 650                                    true);
 651         if (!NT_STATUS_IS_OK(status)) {
 652                 DEBUG(0,("reinit_after_fork() failed\n"));
 653                 smb_panic("reinit_after_fork() failed");
 654         }
 655
 656         prctl_set_comment("spoolssd-master");
 657
 658         /* save the parent process id so the children can use it later */
 659         parent_id = messaging_server_id(msg_ctx);
 660
 661         spoolss_reopen_logs(0);
 662         pfh_daemon_config(DAEMON_NAME,
 663                           &pf_spoolss_cfg,
 664                           &default_pf_spoolss_cfg);
 665
 666         spoolss_setup_sig_term_handler(ev_ctx);
 667         spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);
 668
 669         BlockSignals(false, SIGTERM);
 670         BlockSignals(false, SIGHUP);
 671
 672         /* always start the backgroundqueue listner in spoolssd */
 673         bq_logfile = get_bq_logfile();
 674         pid = start_background_queue(ev_ctx, msg_ctx, bq_logfile);
 675         if (pid > 0) {
 676                 background_lpq_updater_pid = pid;
 677         }
 678
 679         /* the listening fd must be created before the children are actually
 680          * forked out. */
 681         listen_fd = create_named_pipe_socket(SPOOLSS_PIPE_NAME);
 682         if (listen_fd == -1) {
 683                 exit(1);
 684         }
 685
 686         ret = listen(listen_fd, pf_spoolss_cfg.max_allowed_clients);
 687         if (ret == -1) {
 688                 DEBUG(0, ("Failed to listen on spoolss pipe - %s\n",
 689                           strerror(errno)));
 690                 exit(1);
 691         }
 692
 693         /* start children before any more initialization is done */
 694         ok = prefork_create_pool(ev_ctx, /* mem_ctx */
 695                                  ev_ctx, msg_ctx,
 696                                  1, &listen_fd,
 697                                  pf_spoolss_cfg.min_children,
 698                                  pf_spoolss_cfg.max_children,
 699                                  &spoolss_children_main, NULL,
 700                                  &spoolss_pool);
 701         if (!ok) {
 702                 exit(1);
 703         }
 704
 705         if (!serverid_register(messaging_server_id(msg_ctx),
 706                                 FLAG_MSG_GENERAL |
 707                                 FLAG_MSG_PRINT_GENERAL)) {
 708                 exit(1);
 709         }
 710
 711         if (!locking_init()) {
 712                 exit(1);
 713         }
 714
 715         messaging_register(msg_ctx, ev_ctx,
 716                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 717         messaging_register(msg_ctx, NULL, MSG_PRINTER_UPDATE,
 718                            print_queue_forward);
 719         messaging_register(msg_ctx, ev_ctx,
 720                            MSG_PREFORK_CHILD_EVENT, child_ping);
 721
 722         /*
 723          * As soon as messaging is up check if pcap has been loaded already.
 724          * If pcap has not been loaded yet, then ignore, as we will reload on
 725          * client enumeration anyway.
 726          */
 727         if (pcap_cache_loaded(NULL)) {
 728                 load_printers(ev_ctx, msg_ctx);
 729         }
 730
 731         mem_ctx = talloc_new(NULL);
 732         if (mem_ctx == NULL) {
 733                 exit(1);
 734         }
 735
 736         /*
 737          * Initialize spoolss with an init function to convert printers first.
 738          * static_init_rpc will try to initialize the spoolss server too but you
 739          * can't register it twice.
 740          */
 741         spoolss_cb.init = spoolss_init_cb;
 742         spoolss_cb.shutdown = spoolss_shutdown_cb;
 743         spoolss_cb.private_data = msg_ctx;
 744
 745         status = rpc_winreg_init(NULL);
 746         if (!NT_STATUS_IS_OK(status)) {
 747                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 748                           nt_errstr(status)));
 749                 exit(1);
 750         }
 751
 752         status = rpc_spoolss_init(&spoolss_cb);
 753         if (!NT_STATUS_IS_OK(status)) {
 754                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 755                           nt_errstr(status)));
 756                 exit(1);
 757         }
 758
 759         if (epm_mode != RPC_SERVICE_MODE_DISABLED &&
 760             (lp_parm_bool(-1, "rpc_server", "register_embedded_np", false))) {
 761                 status = dcerpc_binding_vector_new(mem_ctx, &v);
 762                 if (!NT_STATUS_IS_OK(status)) {
 763                         DEBUG(0, ("Failed to create binding vector (%s)\n",
 764                                   nt_errstr(status)));
 765                         exit(1);
 766                 }
 767
 768                 status = dcerpc_binding_vector_add_np_default(&ndr_table_spoolss, v);
 769                 if (!NT_STATUS_IS_OK(status)) {
 770                         DEBUG(0, ("Failed to add np to binding vector (%s)\n",
 771                                   nt_errstr(status)));
 772                         exit(1);
 773                 }
 774
 775                 status = rpc_ep_register(ev_ctx, msg_ctx, &ndr_table_spoolss, v);
 776                 if (!NT_STATUS_IS_OK(status)) {
 777                         DEBUG(0, ("Failed to register spoolss endpoint! (%s)\n",
 778                                   nt_errstr(status)));
 779                         exit(1);
 780                 }
 781         }
 782
 783         talloc_free(mem_ctx);
 784
 785         ok = spoolssd_setup_children_monitor(ev_ctx, msg_ctx);
 786         if (!ok) {
 787                 DEBUG(0, ("Failed to setup children monitoring!\n"));
 788                 exit(1);
 789         }
 790
 791         DEBUG(1, ("SPOOLSS Daemon Started (%u)\n", (unsigned int)getpid()));
 792
 793         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 794
 795         /* loop forever */
 796         ret = tevent_loop_wait(ev_ctx);
 797
 798         /* should not be reached */
 799         DEBUG(0,("spoolssd tevent_loop_wait() exited with %d - %s\n",
 800                  ret, (ret == 0) ? "out of events" : strerror(errno)));
 801         exit(1);
 802 }