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 "messages.h"
  24 #include "include/printing.h"
  25 #include "printing/nt_printing_migrate_internal.h"
  26 #include "printing/queue_process.h"
  27 #include "printing/pcap.h"
  28 #include "printing/load.h"
  29 #include "ntdomain.h"
  30 #include "librpc/gen_ndr/srv_winreg.h"
  31 #include "librpc/gen_ndr/srv_spoolss.h"
  32 #include "rpc_server/rpc_server.h"
  33 #include "rpc_server/rpc_ep_register.h"
  34 #include "rpc_server/spoolss/srv_spoolss_nt.h"
  35 #include "librpc/rpc/dcerpc_ep.h"
  36 #include "lib/server_prefork.h"
  37 #include "lib/server_prefork_util.h"
  38
  39 #define SPOOLSS_PIPE_NAME "spoolss"
  40 #define DAEMON_NAME "spoolssd"
  41
  42 static struct server_id parent_id;
  43 static struct prefork_pool *spoolss_pool = NULL;
  44 static int spoolss_child_id = 0;
  45
  46 static struct pf_daemon_config default_pf_spoolss_cfg = {
  47         .prefork_status = PFH_INIT,
  48         .min_children = 5,
  49         .max_children = 25,
  50         .spawn_rate = 5,
  51         .max_allowed_clients = 100,
  52         .child_min_life = 60 /* 1 minute minimum life time */
  53 };
  54 static struct pf_daemon_config pf_spoolss_cfg = { 0 };
  55
  56 pid_t start_spoolssd(struct tevent_context *ev_ctx,
  57                      struct messaging_context *msg_ctx);
  58
  59 static void spoolss_reopen_logs(int child_id)
  60 {
  61         char *lfile = lp_logfile(talloc_tos());
  62         char *ext;
  63         int rc;
  64
  65         if (child_id) {
  66                 rc = asprintf(&ext, "%s.%d", DAEMON_NAME, child_id);
  67         } else {
  68                 rc = asprintf(&ext, "%s", DAEMON_NAME);
  69         }
  70
  71         if (rc == -1) {
  72                 return;
  73         }
  74
  75         rc = 0;
  76         if (lfile == NULL || lfile[0] == '\0') {
  77                 rc = asprintf(&lfile, "%s/log.%s",
  78                               get_dyn_LOGFILEBASE(), ext);
  79         } else {
  80                 if (strstr(lfile, ext) == NULL) {
  81                         if (child_id) {
  82                                 rc = asprintf(&lfile, "%s.%d",
  83                                               lp_logfile(talloc_tos()),
  84                                               child_id);
  85                         } else {
  86                                 rc = asprintf(&lfile, "%s.%s",
  87                                               lp_logfile(talloc_tos()),
  88                                               ext);
  89                         }
  90                 }
  91         }
  92
  93         if (rc > 0) {
  94                 lp_set_logfile(lfile);
  95                 SAFE_FREE(lfile);
  96         }
  97
  98         SAFE_FREE(ext);
  99
 100         reopen_logs();
 101 }
 102
 103 static void update_conf(struct tevent_context *ev,
 104                         struct messaging_context *msg)
 105 {
 106         change_to_root_user();
 107         lp_load(get_dyn_CONFIGFILE(), true, false, false, true);
 108         load_printers(ev, msg);
 109
 110         spoolss_reopen_logs(spoolss_child_id);
 111         if (spoolss_child_id == 0) {
 112                 pfh_daemon_config(DAEMON_NAME,
 113                                   &pf_spoolss_cfg,
 114                                   &default_pf_spoolss_cfg);
 115                 pfh_manage_pool(ev, msg, &pf_spoolss_cfg, spoolss_pool);
 116         }
 117 }
 118
 119 static void smb_conf_updated(struct messaging_context *msg,
 120                              void *private_data,
 121                              uint32_t msg_type,
 122                              struct server_id server_id,
 123                              DATA_BLOB *data)
 124 {
 125         struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
 126                                                              struct tevent_context);
 127
 128         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
 129         update_conf(ev_ctx, msg);
 130 }
 131
 132 static void update_pcap(struct tevent_context *ev_ctx,
 133                         struct messaging_context *msg_ctx)
 134 {
 135         change_to_root_user();
 136         delete_and_reload_printers(ev_ctx, msg_ctx);
 137 }
 138
 139 static void pcap_updated(struct messaging_context *msg,
 140                          void *private_data,
 141                          uint32_t msg_type,
 142                          struct server_id server_id,
 143                          DATA_BLOB *data)
 144 {
 145         struct tevent_context *ev_ctx;
 146
 147         ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
 148
 149         DEBUG(10, ("Got message that pcap updated. Reloading.\n"));
 150         update_pcap(ev_ctx, msg);
 151 }
 152
 153 static void spoolss_sig_term_handler(struct tevent_context *ev,
 154                                      struct tevent_signal *se,
 155                                      int signum,
 156                                      int count,
 157                                      void *siginfo,
 158                                      void *private_data)
 159 {
 160         exit_server_cleanly("termination signal");
 161 }
 162
 163 static void spoolss_setup_sig_term_handler(struct tevent_context *ev_ctx)
 164 {
 165         struct tevent_signal *se;
 166
 167         se = tevent_add_signal(ev_ctx,
 168                                ev_ctx,
 169                                SIGTERM, 0,
 170                                spoolss_sig_term_handler,
 171                                NULL);
 172         if (!se) {
 173                 exit_server("failed to setup SIGTERM handler");
 174         }
 175 }
 176
 177 static void spoolss_sig_hup_handler(struct tevent_context *ev,
 178                                     struct tevent_signal *se,
 179                                     int signum,
 180                                     int count,
 181                                     void *siginfo,
 182                                     void *pvt)
 183 {
 184         struct messaging_context *msg_ctx;
 185
 186         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 187
 188         DEBUG(1,("Reloading printers after SIGHUP\n"));
 189         update_conf(ev, msg_ctx);
 190
 191         /* relay to all children */
 192         if (spoolss_pool) {
 193                 prefork_send_signal_to_all(spoolss_pool, SIGHUP);
 194         }
 195 }
 196
 197 static void spoolss_setup_sig_hup_handler(struct tevent_context *ev_ctx,
 198                                           struct messaging_context *msg_ctx)
 199 {
 200         struct tevent_signal *se;
 201
 202         se = tevent_add_signal(ev_ctx,
 203                                ev_ctx,
 204                                SIGHUP, 0,
 205                                spoolss_sig_hup_handler,
 206                                msg_ctx);
 207         if (!se) {
 208                 exit_server("failed to setup SIGHUP handler");
 209         }
 210 }
 211
 212 static bool spoolss_init_cb(void *ptr)
 213 {
 214         struct messaging_context *msg_ctx = talloc_get_type_abort(
 215                 ptr, struct messaging_context);
 216
 217         return nt_printing_tdb_migrate(msg_ctx);
 218 }
 219
 220 static bool spoolss_shutdown_cb(void *ptr)
 221 {
 222         srv_spoolss_cleanup();
 223
 224         return true;
 225 }
 226
 227 /* Children */
 228
 229 static void spoolss_chld_sig_hup_handler(struct tevent_context *ev,
 230                                          struct tevent_signal *se,
 231                                          int signum,
 232                                          int count,
 233                                          void *siginfo,
 234                                          void *pvt)
 235 {
 236         struct messaging_context *msg_ctx;
 237
 238         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 239
 240         change_to_root_user();
 241         DEBUG(1,("Reloading printers after SIGHUP\n"));
 242         load_printers(ev, msg_ctx);
 243         spoolss_reopen_logs(spoolss_child_id);
 244 }
 245
 246 static bool spoolss_setup_chld_hup_handler(struct tevent_context *ev_ctx,
 247                                            struct messaging_context *msg_ctx,
 248                                            struct pf_worker_data *pf)
 249 {
 250         struct tevent_signal *se;
 251
 252         se = tevent_add_signal(ev_ctx,
 253                                ev_ctx,
 254                                SIGHUP, 0,
 255                                spoolss_chld_sig_hup_handler,
 256                                msg_ctx);
 257         if (!se) {
 258                 DEBUG(1, ("failed to setup SIGHUP handler"));
 259                 return false;
 260         }
 261
 262         return true;
 263 }
 264
 265 static void parent_ping(struct messaging_context *msg_ctx,
 266                         void *private_data,
 267                         uint32_t msg_type,
 268                         struct server_id server_id,
 269                         DATA_BLOB *data)
 270 {
 271
 272         /* The fact we received this message is enough to let make the event
 273          * loop if it was idle. spoolss_children_main will cycle through
 274          * spoolss_next_client at least once. That function will take whatever
 275          * action is necessary */
 276
 277         DEBUG(10, ("Got message that the parent changed status.\n"));
 278         return;
 279 }
 280
 281 static bool spoolss_child_init(struct tevent_context *ev_ctx,
 282                                int child_id, struct pf_worker_data *pf)
 283 {
 284         NTSTATUS status;
 285         struct rpc_srv_callbacks spoolss_cb;
 286         struct messaging_context *msg_ctx = messaging_init(NULL, ev_ctx);
 287         bool ok;
 288
 289         status = reinit_after_fork(msg_ctx, ev_ctx,
 290                                    true);
 291         if (!NT_STATUS_IS_OK(status)) {
 292                 DEBUG(0,("reinit_after_fork() failed\n"));
 293                 smb_panic("reinit_after_fork() failed");
 294         }
 295
 296         spoolss_child_id = child_id;
 297         spoolss_reopen_logs(child_id);
 298
 299         ok = spoolss_setup_chld_hup_handler(ev_ctx, msg_ctx, pf);
 300         if (!ok) {
 301                 return false;
 302         }
 303
 304         if (!serverid_register(messaging_server_id(msg_ctx),
 305                                 FLAG_MSG_GENERAL |
 306                                 FLAG_MSG_PRINT_GENERAL)) {
 307                 return false;
 308         }
 309
 310         if (!locking_init()) {
 311                 return false;
 312         }
 313
 314         messaging_register(msg_ctx, ev_ctx,
 315                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 316         messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
 317                            pcap_updated);
 318         messaging_register(msg_ctx, ev_ctx,
 319                            MSG_PREFORK_PARENT_EVENT, parent_ping);
 320
 321         /* As soon as messaging is up check if pcap has been loaded already.
 322          * If so then we probably missed a message and should load_printers()
 323          * ourselves. If pcap has not been loaded yet, then ignore, we will get
 324          * a message as soon as the bq process completes the reload. */
 325         if (pcap_cache_loaded()) {
 326                 load_printers(ev_ctx, msg_ctx);
 327         }
 328
 329         /* try to reinit rpc queues */
 330         spoolss_cb.init = spoolss_init_cb;
 331         spoolss_cb.shutdown = spoolss_shutdown_cb;
 332         spoolss_cb.private_data = msg_ctx;
 333
 334         status = rpc_winreg_init(NULL);
 335         if (!NT_STATUS_IS_OK(status)) {
 336                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 337                           nt_errstr(status)));
 338                 return false;
 339         }
 340
 341         status = rpc_spoolss_init(&spoolss_cb);
 342         if (!NT_STATUS_IS_OK(status)) {
 343                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 344                           nt_errstr(status)));
 345                 return false;
 346         }
 347
 348         return true;
 349 }
 350
 351 struct spoolss_children_data {
 352         struct tevent_context *ev_ctx;
 353         struct messaging_context *msg_ctx;
 354         struct pf_worker_data *pf;
 355         int listen_fd_size;
 356         int *listen_fds;
 357 };
 358
 359 static void spoolss_next_client(void *pvt);
 360
 361 static int spoolss_children_main(struct tevent_context *ev_ctx,
 362                                  struct messaging_context *msg_ctx,
 363                                  struct pf_worker_data *pf,
 364                                  int child_id,
 365                                  int listen_fd_size,
 366                                  int *listen_fds,
 367                                  void *private_data)
 368 {
 369         struct spoolss_children_data *data;
 370         bool ok;
 371         int ret;
 372
 373         ok = spoolss_child_init(ev_ctx, child_id, pf);
 374         if (!ok) {
 375                 return 1;
 376         }
 377
 378         data = talloc(ev_ctx, struct spoolss_children_data);
 379         if (!data) {
 380                 return 1;
 381         }
 382         data->pf = pf;
 383         data->ev_ctx = ev_ctx;
 384         data->msg_ctx = msg_ctx;
 385         data->listen_fd_size = listen_fd_size;
 386         data->listen_fds = listen_fds;
 387
 388         /* loop until it is time to exit */
 389         while (pf->status != PF_WORKER_EXITING) {
 390                 /* try to see if it is time to schedule the next client */
 391                 spoolss_next_client(data);
 392
 393                 ret = tevent_loop_once(ev_ctx);
 394                 if (ret != 0) {
 395                         DEBUG(0, ("tevent_loop_once() exited with %d: %s\n",
 396                                   ret, strerror(errno)));
 397                         pf->status = PF_WORKER_EXITING;
 398                 }
 399         }
 400
 401         return ret;
 402 }
 403
 404 static void spoolss_client_terminated(void *pvt)
 405 {
 406         struct spoolss_children_data *data;
 407
 408         data = talloc_get_type_abort(pvt, struct spoolss_children_data);
 409
 410         pfh_client_terminated(data->pf);
 411
 412         spoolss_next_client(pvt);
 413 }
 414
 415 struct spoolss_new_client {
 416         struct spoolss_children_data *data;
 417         struct tsocket_address *srv_addr;
 418         struct tsocket_address *cli_addr;
 419 };
 420
 421 static void spoolss_handle_client(struct tevent_req *req);
 422
 423 static void spoolss_next_client(void *pvt)
 424 {
 425         struct tevent_req *req;
 426         struct spoolss_children_data *data;
 427         struct spoolss_new_client *next;
 428
 429         data = talloc_get_type_abort(pvt, struct spoolss_children_data);
 430
 431         if (!pfh_child_allowed_to_accept(data->pf)) {
 432                 /* nothing to do for now we are already listening
 433                  * or we are not allowed to listen further */
 434                 return;
 435         }
 436
 437         next = talloc_zero(data, struct spoolss_new_client);
 438         if (!next) {
 439                 DEBUG(1, ("Out of memory!?\n"));
 440                 return;
 441         }
 442         next->data = data;
 443
 444         req = prefork_listen_send(next, data->ev_ctx, data->pf,
 445                                   data->listen_fd_size,
 446                                   data->listen_fds);
 447         if (!req) {
 448                 DEBUG(1, ("Failed to make listening request!?\n"));
 449                 talloc_free(next);
 450                 return;
 451         }
 452         tevent_req_set_callback(req, spoolss_handle_client, next);
 453 }
 454
 455 static void spoolss_handle_client(struct tevent_req *req)
 456 {
 457         struct spoolss_children_data *data;
 458         struct spoolss_new_client *client;
 459         const DATA_BLOB ping = data_blob_null;
 460         int ret;
 461         int sd;
 462
 463         client = tevent_req_callback_data(req, struct spoolss_new_client);
 464         data = client->data;
 465
 466         ret = prefork_listen_recv(req, client, &sd,
 467                                   &client->srv_addr, &client->cli_addr);
 468
 469         /* this will free the request too */
 470         talloc_free(client);
 471
 472         if (ret != 0) {
 473                 DEBUG(6, ("No client connection was available after all!\n"));
 474                 return;
 475         }
 476
 477         /* Warn parent that our status changed */
 478         messaging_send(data->msg_ctx, parent_id,
 479                         MSG_PREFORK_CHILD_EVENT, &ping);
 480
 481         DEBUG(2, ("Spoolss preforked child %d got client connection!\n",
 482                   (int)(data->pf->pid)));
 483
 484         named_pipe_accept_function(data->ev_ctx, data->msg_ctx,
 485                                    SPOOLSS_PIPE_NAME, sd,
 486                                    spoolss_client_terminated, data);
 487 }
 488
 489 /* ==== Main Process Functions ==== */
 490
 491 extern pid_t background_lpq_updater_pid;
 492 static char *bq_logfile;
 493
 494 static void check_updater_child(struct tevent_context *ev_ctx,
 495                                 struct messaging_context *msg_ctx)
 496 {
 497         int status;
 498         pid_t pid;
 499
 500         if (background_lpq_updater_pid == -1) {
 501                 return;
 502         }
 503
 504         pid = sys_waitpid(background_lpq_updater_pid, &status, WNOHANG);
 505         if (pid > 0) {
 506                 DEBUG(2, ("The background queue child died... Restarting!\n"));
 507                 pid = start_background_queue(ev_ctx, msg_ctx, bq_logfile);
 508                 background_lpq_updater_pid = pid;
 509         }
 510 }
 511
 512 static void child_ping(struct messaging_context *msg_ctx,
 513                         void *private_data,
 514                         uint32_t msg_type,
 515                         struct server_id server_id,
 516                         DATA_BLOB *data)
 517 {
 518         struct tevent_context *ev_ctx;
 519
 520         ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
 521
 522         DEBUG(10, ("Got message that a child changed status.\n"));
 523         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 524 }
 525
 526 static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
 527                                     struct messaging_context *msg_ctx,
 528                                     struct timeval current_time);
 529 static void spoolssd_check_children(struct tevent_context *ev_ctx,
 530                                     struct tevent_timer *te,
 531                                     struct timeval current_time,
 532                                     void *pvt);
 533
 534 static void spoolssd_sigchld_handler(struct tevent_context *ev_ctx,
 535                                      struct prefork_pool *pfp,
 536                                      void *pvt)
 537 {
 538         struct messaging_context *msg_ctx;
 539
 540         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 541
 542         /* run pool management so we can fork/retire or increase
 543          * the allowed connections per child based on load */
 544         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 545
 546         /* also check if the updater child is alive and well */
 547         check_updater_child(ev_ctx, msg_ctx);
 548 }
 549
 550 static bool spoolssd_setup_children_monitor(struct tevent_context *ev_ctx,
 551                                             struct messaging_context *msg_ctx)
 552 {
 553         bool ok;
 554
 555         /* add our oun sigchld callback */
 556         prefork_set_sigchld_callback(spoolss_pool,
 557                                      spoolssd_sigchld_handler, msg_ctx);
 558
 559         ok = spoolssd_schedule_check(ev_ctx, msg_ctx,
 560                                      tevent_timeval_current());
 561         return ok;
 562 }
 563
 564 static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
 565                                     struct messaging_context *msg_ctx,
 566                                     struct timeval current_time)
 567 {
 568         struct tevent_timer *te;
 569         struct timeval next_event;
 570
 571         /* check situation again in 10 seconds */
 572         next_event = tevent_timeval_current_ofs(10, 0);
 573
 574         /* TODO: check when the socket becomes readable, so that children
 575          * are checked only when there is some activity ? */
 576         te = tevent_add_timer(ev_ctx, spoolss_pool, next_event,
 577                                 spoolssd_check_children, msg_ctx);
 578         if (!te) {
 579                 DEBUG(2, ("Failed to set up children monitoring!\n"));
 580                 return false;
 581         }
 582
 583         return true;
 584 }
 585
 586 static void spoolssd_check_children(struct tevent_context *ev_ctx,
 587                                     struct tevent_timer *te,
 588                                     struct timeval current_time,
 589                                     void *pvt)
 590 {
 591         struct messaging_context *msg_ctx;
 592
 593         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 594
 595         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 596
 597         spoolssd_schedule_check(ev_ctx, msg_ctx, current_time);
 598 }
 599
 600 static void print_queue_forward(struct messaging_context *msg,
 601                                 void *private_data,
 602                                 uint32_t msg_type,
 603                                 struct server_id server_id,
 604                                 DATA_BLOB *data)
 605 {
 606         messaging_send_buf(msg, pid_to_procid(background_lpq_updater_pid),
 607                            MSG_PRINTER_UPDATE, data->data, data->length);
 608 }
 609
 610 static char *get_bq_logfile(void)
 611 {
 612         char *lfile = lp_logfile(talloc_tos());
 613         int rc;
 614
 615         if (lfile == NULL || lfile[0] == '\0') {
 616                 rc = asprintf(&lfile, "%s/log.%s.bq",
 617                                         get_dyn_LOGFILEBASE(), DAEMON_NAME);
 618         } else {
 619                 rc = asprintf(&lfile, "%s.bq", lp_logfile(talloc_tos()));
 620         }
 621         if (rc == -1) {
 622                 lfile = NULL;
 623         }
 624         return lfile;
 625 }
 626
 627 pid_t start_spoolssd(struct tevent_context *ev_ctx,
 628                     struct messaging_context *msg_ctx)
 629 {
 630         struct rpc_srv_callbacks spoolss_cb;
 631         struct dcerpc_binding_vector *v;
 632         TALLOC_CTX *mem_ctx;
 633         pid_t pid;
 634         NTSTATUS status;
 635         int listen_fd;
 636         int ret;
 637         bool ok;
 638
 639         DEBUG(1, ("Forking SPOOLSS Daemon\n"));
 640
 641         /*
 642          * Block signals before forking child as it will have to
 643          * set its own handlers. Child will re-enable SIGHUP as
 644          * soon as the handlers are set up.
 645          */
 646         BlockSignals(true, SIGTERM);
 647         BlockSignals(true, SIGHUP);
 648
 649         pid = fork();
 650
 651         if (pid == -1) {
 652                 DEBUG(0, ("Failed to fork SPOOLSS [%s]\n",
 653                            strerror(errno)));
 654         }
 655
 656         /* parent or error */
 657         if (pid != 0) {
 658
 659                 /* Re-enable SIGHUP before returnig */
 660                 BlockSignals(false, SIGTERM);
 661                 BlockSignals(false, SIGHUP);
 662                 return pid;
 663         }
 664
 665         status = reinit_after_fork(msg_ctx,
 666                                    ev_ctx,
 667                                    true);
 668         if (!NT_STATUS_IS_OK(status)) {
 669                 DEBUG(0,("reinit_after_fork() failed\n"));
 670                 smb_panic("reinit_after_fork() failed");
 671         }
 672
 673         /* save the parent process id so the children can use it later */
 674         parent_id = messaging_server_id(msg_ctx);
 675
 676         spoolss_reopen_logs(0);
 677         pfh_daemon_config(DAEMON_NAME,
 678                           &pf_spoolss_cfg,
 679                           &default_pf_spoolss_cfg);
 680
 681         spoolss_setup_sig_term_handler(ev_ctx);
 682         spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);
 683
 684         BlockSignals(false, SIGTERM);
 685         BlockSignals(false, SIGHUP);
 686
 687         /* always start the backgroundqueue listner in spoolssd */
 688         bq_logfile = get_bq_logfile();
 689         pid = start_background_queue(ev_ctx, msg_ctx, bq_logfile);
 690         if (pid > 0) {
 691                 background_lpq_updater_pid = pid;
 692         }
 693
 694         /* the listening fd must be created before the children are actually
 695          * forked out. */
 696         listen_fd = create_named_pipe_socket(SPOOLSS_PIPE_NAME);
 697         if (listen_fd == -1) {
 698                 exit(1);
 699         }
 700
 701         ret = listen(listen_fd, pf_spoolss_cfg.max_allowed_clients);
 702         if (ret == -1) {
 703                 DEBUG(0, ("Failed to listen on spoolss pipe - %s\n",
 704                           strerror(errno)));
 705                 exit(1);
 706         }
 707
 708         /* start children before any more initialization is done */
 709         ok = prefork_create_pool(ev_ctx, /* mem_ctx */
 710                                  ev_ctx, msg_ctx,
 711                                  1, &listen_fd,
 712                                  pf_spoolss_cfg.min_children,
 713                                  pf_spoolss_cfg.max_children,
 714                                  &spoolss_children_main, NULL,
 715                                  &spoolss_pool);
 716         if (!ok) {
 717                 exit(1);
 718         }
 719
 720         if (!serverid_register(messaging_server_id(msg_ctx),
 721                                 FLAG_MSG_GENERAL |
 722                                 FLAG_MSG_PRINT_GENERAL)) {
 723                 exit(1);
 724         }
 725
 726         if (!locking_init()) {
 727                 exit(1);
 728         }
 729
 730         messaging_register(msg_ctx, ev_ctx,
 731                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 732         messaging_register(msg_ctx, NULL, MSG_PRINTER_UPDATE,
 733                            print_queue_forward);
 734         messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
 735                            pcap_updated);
 736         messaging_register(msg_ctx, ev_ctx,
 737                            MSG_PREFORK_CHILD_EVENT, child_ping);
 738
 739         /* As soon as messaging is up check if pcap has been loaded already.
 740          * If so then we probably missed a message and should load_printers()
 741          * ourselves. If pcap has not been loaded yet, then ignore, we will get
 742          * a message as soon as the bq process completes the reload. */
 743         if (pcap_cache_loaded()) {
 744                 load_printers(ev_ctx, msg_ctx);
 745         }
 746
 747         mem_ctx = talloc_new(NULL);
 748         if (mem_ctx == NULL) {
 749                 exit(1);
 750         }
 751
 752         /*
 753          * Initialize spoolss with an init function to convert printers first.
 754          * static_init_rpc will try to initialize the spoolss server too but you
 755          * can't register it twice.
 756          */
 757         spoolss_cb.init = spoolss_init_cb;
 758         spoolss_cb.shutdown = spoolss_shutdown_cb;
 759         spoolss_cb.private_data = msg_ctx;
 760
 761         status = rpc_winreg_init(NULL);
 762         if (!NT_STATUS_IS_OK(status)) {
 763                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 764                           nt_errstr(status)));
 765                 exit(1);
 766         }
 767
 768         status = rpc_spoolss_init(&spoolss_cb);
 769         if (!NT_STATUS_IS_OK(status)) {
 770                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 771                           nt_errstr(status)));
 772                 exit(1);
 773         }
 774
 775         status = dcerpc_binding_vector_new(mem_ctx, &v);
 776         if (!NT_STATUS_IS_OK(status)) {
 777                 DEBUG(0, ("Failed to create binding vector (%s)\n",
 778                           nt_errstr(status)));
 779                 exit(1);
 780         }
 781
 782         status = dcerpc_binding_vector_add_np_default(&ndr_table_spoolss, v);
 783         if (!NT_STATUS_IS_OK(status)) {
 784                 DEBUG(0, ("Failed to add np to binding vector (%s)\n",
 785                           nt_errstr(status)));
 786                 exit(1);
 787         }
 788
 789         status = rpc_ep_register(ev_ctx, msg_ctx, &ndr_table_spoolss, v);
 790         if (!NT_STATUS_IS_OK(status)) {
 791                 DEBUG(0, ("Failed to register spoolss endpoint! (%s)\n",
 792                           nt_errstr(status)));
 793                 exit(1);
 794         }
 795
 796         talloc_free(mem_ctx);
 797
 798         ok = spoolssd_setup_children_monitor(ev_ctx, msg_ctx);
 799         if (!ok) {
 800                 DEBUG(0, ("Failed to setup children monitoring!\n"));
 801                 exit(1);
 802         }
 803
 804         DEBUG(1, ("SPOOLSS Daemon Started (%d)\n", getpid()));
 805
 806         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 807
 808         /* loop forever */
 809         ret = tevent_loop_wait(ev_ctx);
 810
 811         /* should not be reached */
 812         DEBUG(0,("spoolssd tevent_loop_wait() exited with %d - %s\n",
 813                  ret, (ret == 0) ? "out of events" : strerror(errno)));
 814         exit(1);
 815 }