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();
  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(), child_id);
  84                         } else {
  85                                 rc = asprintf(&lfile, "%s.%s",
  86                                               lp_logfile(), ext);
  87                         }
  88                 }
  89         }
  90
  91         if (rc > 0) {
  92                 lp_set_logfile(lfile);
  93                 SAFE_FREE(lfile);
  94         }
  95
  96         SAFE_FREE(ext);
  97
  98         reopen_logs();
  99 }
 100
 101 static void update_conf(struct tevent_context *ev,
 102                         struct messaging_context *msg)
 103 {
 104         change_to_root_user();
 105         lp_load(get_dyn_CONFIGFILE(), true, false, false, true);
 106         load_printers(ev, msg);
 107
 108         spoolss_reopen_logs(spoolss_child_id);
 109         if (spoolss_child_id == 0) {
 110                 pfh_daemon_config(DAEMON_NAME,
 111                                   &pf_spoolss_cfg,
 112                                   &default_pf_spoolss_cfg);
 113                 pfh_manage_pool(ev, msg, &pf_spoolss_cfg, spoolss_pool);
 114         }
 115 }
 116
 117 static void smb_conf_updated(struct messaging_context *msg,
 118                              void *private_data,
 119                              uint32_t msg_type,
 120                              struct server_id server_id,
 121                              DATA_BLOB *data)
 122 {
 123         struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
 124                                                              struct tevent_context);
 125
 126         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
 127         update_conf(ev_ctx, msg);
 128 }
 129
 130 static void update_pcap(struct tevent_context *ev_ctx,
 131                         struct messaging_context *msg_ctx)
 132 {
 133         change_to_root_user();
 134         delete_and_reload_printers(ev_ctx, msg_ctx);
 135 }
 136
 137 static void pcap_updated(struct messaging_context *msg,
 138                          void *private_data,
 139                          uint32_t msg_type,
 140                          struct server_id server_id,
 141                          DATA_BLOB *data)
 142 {
 143         struct tevent_context *ev_ctx;
 144
 145         ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
 146
 147         DEBUG(10, ("Got message that pcap updated. Reloading.\n"));
 148         update_pcap(ev_ctx, msg);
 149 }
 150
 151 static void spoolss_sig_term_handler(struct tevent_context *ev,
 152                                      struct tevent_signal *se,
 153                                      int signum,
 154                                      int count,
 155                                      void *siginfo,
 156                                      void *private_data)
 157 {
 158         exit_server_cleanly("termination signal");
 159 }
 160
 161 static void spoolss_setup_sig_term_handler(struct tevent_context *ev_ctx)
 162 {
 163         struct tevent_signal *se;
 164
 165         se = tevent_add_signal(ev_ctx,
 166                                ev_ctx,
 167                                SIGTERM, 0,
 168                                spoolss_sig_term_handler,
 169                                NULL);
 170         if (!se) {
 171                 exit_server("failed to setup SIGTERM handler");
 172         }
 173 }
 174
 175 static void spoolss_sig_hup_handler(struct tevent_context *ev,
 176                                     struct tevent_signal *se,
 177                                     int signum,
 178                                     int count,
 179                                     void *siginfo,
 180                                     void *pvt)
 181 {
 182         struct messaging_context *msg_ctx;
 183
 184         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 185
 186         DEBUG(1,("Reloading printers after SIGHUP\n"));
 187         update_conf(ev, msg_ctx);
 188
 189         /* relay to all children */
 190         if (spoolss_pool) {
 191                 prefork_send_signal_to_all(spoolss_pool, SIGHUP);
 192         }
 193 }
 194
 195 static void spoolss_setup_sig_hup_handler(struct tevent_context *ev_ctx,
 196                                           struct messaging_context *msg_ctx)
 197 {
 198         struct tevent_signal *se;
 199
 200         se = tevent_add_signal(ev_ctx,
 201                                ev_ctx,
 202                                SIGHUP, 0,
 203                                spoolss_sig_hup_handler,
 204                                msg_ctx);
 205         if (!se) {
 206                 exit_server("failed to setup SIGHUP handler");
 207         }
 208 }
 209
 210 static bool spoolss_init_cb(void *ptr)
 211 {
 212         struct messaging_context *msg_ctx = talloc_get_type_abort(
 213                 ptr, struct messaging_context);
 214
 215         return nt_printing_tdb_migrate(msg_ctx);
 216 }
 217
 218 static bool spoolss_shutdown_cb(void *ptr)
 219 {
 220         srv_spoolss_cleanup();
 221
 222         return true;
 223 }
 224
 225 /* Children */
 226
 227 static void spoolss_chld_sig_hup_handler(struct tevent_context *ev,
 228                                          struct tevent_signal *se,
 229                                          int signum,
 230                                          int count,
 231                                          void *siginfo,
 232                                          void *pvt)
 233 {
 234         struct messaging_context *msg_ctx;
 235
 236         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 237
 238         change_to_root_user();
 239         DEBUG(1,("Reloading printers after SIGHUP\n"));
 240         load_printers(ev, msg_ctx);
 241         spoolss_reopen_logs(spoolss_child_id);
 242 }
 243
 244 static bool spoolss_setup_chld_hup_handler(struct tevent_context *ev_ctx,
 245                                            struct messaging_context *msg_ctx,
 246                                            struct pf_worker_data *pf)
 247 {
 248         struct tevent_signal *se;
 249
 250         se = tevent_add_signal(ev_ctx,
 251                                ev_ctx,
 252                                SIGHUP, 0,
 253                                spoolss_chld_sig_hup_handler,
 254                                msg_ctx);
 255         if (!se) {
 256                 DEBUG(1, ("failed to setup SIGHUP handler"));
 257                 return false;
 258         }
 259
 260         return true;
 261 }
 262
 263 static void parent_ping(struct messaging_context *msg_ctx,
 264                         void *private_data,
 265                         uint32_t msg_type,
 266                         struct server_id server_id,
 267                         DATA_BLOB *data)
 268 {
 269
 270         /* The fact we received this message is enough to let make the event
 271          * loop if it was idle. spoolss_children_main will cycle through
 272          * spoolss_next_client at least once. That function will take whatever
 273          * action is necessary */
 274
 275         DEBUG(10, ("Got message that the parent changed status.\n"));
 276         return;
 277 }
 278
 279 static bool spoolss_child_init(struct tevent_context *ev_ctx,
 280                                int child_id, struct pf_worker_data *pf)
 281 {
 282         NTSTATUS status;
 283         struct rpc_srv_callbacks spoolss_cb;
 284         struct messaging_context *msg_ctx = messaging_init(NULL, ev_ctx);
 285         bool ok;
 286
 287         status = reinit_after_fork(msg_ctx, ev_ctx,
 288                                    true);
 289         if (!NT_STATUS_IS_OK(status)) {
 290                 DEBUG(0,("reinit_after_fork() failed\n"));
 291                 smb_panic("reinit_after_fork() failed");
 292         }
 293
 294         spoolss_child_id = child_id;
 295         spoolss_reopen_logs(child_id);
 296
 297         ok = spoolss_setup_chld_hup_handler(ev_ctx, msg_ctx, pf);
 298         if (!ok) {
 299                 return false;
 300         }
 301
 302         if (!serverid_register(procid_self(),
 303                                 FLAG_MSG_GENERAL |
 304                                 FLAG_MSG_PRINT_GENERAL)) {
 305                 return false;
 306         }
 307
 308         if (!locking_init()) {
 309                 return false;
 310         }
 311
 312         messaging_register(msg_ctx, ev_ctx,
 313                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 314         messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
 315                            pcap_updated);
 316         messaging_register(msg_ctx, ev_ctx,
 317                            MSG_PREFORK_PARENT_EVENT, parent_ping);
 318
 319         /* As soon as messaging is up check if pcap has been loaded already.
 320          * If so then we probably missed a message and should load_printers()
 321          * ourselves. If pcap has not been loaded yet, then ignore, we will get
 322          * a message as soon as the bq process completes the reload. */
 323         if (pcap_cache_loaded()) {
 324                 load_printers(ev_ctx, msg_ctx);
 325         }
 326
 327         /* try to reinit rpc queues */
 328         spoolss_cb.init = spoolss_init_cb;
 329         spoolss_cb.shutdown = spoolss_shutdown_cb;
 330         spoolss_cb.private_data = msg_ctx;
 331
 332         status = rpc_winreg_init(NULL);
 333         if (!NT_STATUS_IS_OK(status)) {
 334                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 335                           nt_errstr(status)));
 336                 return false;
 337         }
 338
 339         status = rpc_spoolss_init(&spoolss_cb);
 340         if (!NT_STATUS_IS_OK(status)) {
 341                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 342                           nt_errstr(status)));
 343                 return false;
 344         }
 345
 346         return true;
 347 }
 348
 349 struct spoolss_children_data {
 350         struct tevent_context *ev_ctx;
 351         struct messaging_context *msg_ctx;
 352         struct pf_worker_data *pf;
 353         int listen_fd_size;
 354         int *listen_fds;
 355 };
 356
 357 static void spoolss_next_client(void *pvt);
 358
 359 static int spoolss_children_main(struct tevent_context *ev_ctx,
 360                                  struct messaging_context *msg_ctx,
 361                                  struct pf_worker_data *pf,
 362                                  int child_id,
 363                                  int listen_fd_size,
 364                                  int *listen_fds,
 365                                  void *private_data)
 366 {
 367         struct spoolss_children_data *data;
 368         bool ok;
 369         int ret;
 370
 371         ok = spoolss_child_init(ev_ctx, child_id, pf);
 372         if (!ok) {
 373                 return 1;
 374         }
 375
 376         data = talloc(ev_ctx, struct spoolss_children_data);
 377         if (!data) {
 378                 return 1;
 379         }
 380         data->pf = pf;
 381         data->ev_ctx = ev_ctx;
 382         data->msg_ctx = msg_ctx;
 383         data->listen_fd_size = listen_fd_size;
 384         data->listen_fds = listen_fds;
 385
 386         /* loop until it is time to exit */
 387         while (pf->status != PF_WORKER_EXITING) {
 388                 /* try to see if it is time to schedule the next client */
 389                 spoolss_next_client(data);
 390
 391                 ret = tevent_loop_once(ev_ctx);
 392                 if (ret != 0) {
 393                         DEBUG(0, ("tevent_loop_once() exited with %d: %s\n",
 394                                   ret, strerror(errno)));
 395                         pf->status = PF_WORKER_EXITING;
 396                 }
 397         }
 398
 399         return ret;
 400 }
 401
 402 static void spoolss_client_terminated(void *pvt)
 403 {
 404         struct spoolss_children_data *data;
 405
 406         data = talloc_get_type_abort(pvt, struct spoolss_children_data);
 407
 408         pfh_client_terminated(data->pf);
 409
 410         spoolss_next_client(pvt);
 411 }
 412
 413 struct spoolss_new_client {
 414         struct spoolss_children_data *data;
 415         struct tsocket_address *srv_addr;
 416         struct tsocket_address *cli_addr;
 417 };
 418
 419 static void spoolss_handle_client(struct tevent_req *req);
 420
 421 static void spoolss_next_client(void *pvt)
 422 {
 423         struct tevent_req *req;
 424         struct spoolss_children_data *data;
 425         struct spoolss_new_client *next;
 426
 427         data = talloc_get_type_abort(pvt, struct spoolss_children_data);
 428
 429         if (!pfh_child_allowed_to_accept(data->pf)) {
 430                 /* nothing to do for now we are already listening
 431                  * or we are not allowed to listen further */
 432                 return;
 433         }
 434
 435         next = talloc_zero(data, struct spoolss_new_client);
 436         if (!next) {
 437                 DEBUG(1, ("Out of memory!?\n"));
 438                 return;
 439         }
 440         next->data = data;
 441
 442         req = prefork_listen_send(next, data->ev_ctx, data->pf,
 443                                   data->listen_fd_size,
 444                                   data->listen_fds);
 445         if (!req) {
 446                 DEBUG(1, ("Failed to make listening request!?\n"));
 447                 talloc_free(next);
 448                 return;
 449         }
 450         tevent_req_set_callback(req, spoolss_handle_client, next);
 451 }
 452
 453 static void spoolss_handle_client(struct tevent_req *req)
 454 {
 455         struct spoolss_children_data *data;
 456         struct spoolss_new_client *client;
 457         const DATA_BLOB ping = data_blob_null;
 458         int ret;
 459         int sd;
 460
 461         client = tevent_req_callback_data(req, struct spoolss_new_client);
 462         data = client->data;
 463
 464         ret = prefork_listen_recv(req, client, &sd,
 465                                   &client->srv_addr, &client->cli_addr);
 466
 467         /* this will free the request too */
 468         talloc_free(client);
 469
 470         if (ret != 0) {
 471                 DEBUG(6, ("No client connection was available after all!\n"));
 472                 return;
 473         }
 474
 475         /* Warn parent that our status changed */
 476         messaging_send(data->msg_ctx, parent_id,
 477                         MSG_PREFORK_CHILD_EVENT, &ping);
 478
 479         DEBUG(2, ("Spoolss preforked child %d got client connection!\n",
 480                   (int)(data->pf->pid)));
 481
 482         named_pipe_accept_function(data->ev_ctx, data->msg_ctx,
 483                                    SPOOLSS_PIPE_NAME, sd,
 484                                    spoolss_client_terminated, data);
 485 }
 486
 487 /* ==== Main Process Functions ==== */
 488
 489 extern pid_t background_lpq_updater_pid;
 490 static char *bq_logfile;
 491
 492 static void check_updater_child(struct tevent_context *ev_ctx,
 493                                 struct messaging_context *msg_ctx)
 494 {
 495         int status;
 496         pid_t pid;
 497
 498         if (background_lpq_updater_pid == -1) {
 499                 return;
 500         }
 501
 502         pid = sys_waitpid(background_lpq_updater_pid, &status, WNOHANG);
 503         if (pid > 0) {
 504                 DEBUG(2, ("The background queue child died... Restarting!\n"));
 505                 pid = start_background_queue(ev_ctx, msg_ctx, bq_logfile);
 506                 background_lpq_updater_pid = pid;
 507         }
 508 }
 509
 510 static void child_ping(struct messaging_context *msg_ctx,
 511                         void *private_data,
 512                         uint32_t msg_type,
 513                         struct server_id server_id,
 514                         DATA_BLOB *data)
 515 {
 516         struct tevent_context *ev_ctx;
 517
 518         ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
 519
 520         DEBUG(10, ("Got message that a child changed status.\n"));
 521         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 522 }
 523
 524 static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
 525                                     struct messaging_context *msg_ctx,
 526                                     struct timeval current_time);
 527 static void spoolssd_check_children(struct tevent_context *ev_ctx,
 528                                     struct tevent_timer *te,
 529                                     struct timeval current_time,
 530                                     void *pvt);
 531
 532 static void spoolssd_sigchld_handler(struct tevent_context *ev_ctx,
 533                                      struct prefork_pool *pfp,
 534                                      void *pvt)
 535 {
 536         struct messaging_context *msg_ctx;
 537
 538         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 539
 540         /* run pool management so we can fork/retire or increase
 541          * the allowed connections per child based on load */
 542         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 543
 544         /* also check if the updater child is alive and well */
 545         check_updater_child(ev_ctx, msg_ctx);
 546 }
 547
 548 static bool spoolssd_setup_children_monitor(struct tevent_context *ev_ctx,
 549                                             struct messaging_context *msg_ctx)
 550 {
 551         bool ok;
 552
 553         /* add our oun sigchld callback */
 554         prefork_set_sigchld_callback(spoolss_pool,
 555                                      spoolssd_sigchld_handler, msg_ctx);
 556
 557         ok = spoolssd_schedule_check(ev_ctx, msg_ctx,
 558                                      tevent_timeval_current());
 559         return ok;
 560 }
 561
 562 static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
 563                                     struct messaging_context *msg_ctx,
 564                                     struct timeval current_time)
 565 {
 566         struct tevent_timer *te;
 567         struct timeval next_event;
 568
 569         /* check situation again in 10 seconds */
 570         next_event = tevent_timeval_current_ofs(10, 0);
 571
 572         /* TODO: check when the socket becomes readable, so that children
 573          * are checked only when there is some activity ? */
 574         te = tevent_add_timer(ev_ctx, spoolss_pool, next_event,
 575                                 spoolssd_check_children, msg_ctx);
 576         if (!te) {
 577                 DEBUG(2, ("Failed to set up children monitoring!\n"));
 578                 return false;
 579         }
 580
 581         return true;
 582 }
 583
 584 static void spoolssd_check_children(struct tevent_context *ev_ctx,
 585                                     struct tevent_timer *te,
 586                                     struct timeval current_time,
 587                                     void *pvt)
 588 {
 589         struct messaging_context *msg_ctx;
 590
 591         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 592
 593         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 594
 595         spoolssd_schedule_check(ev_ctx, msg_ctx, current_time);
 596 }
 597
 598 static void print_queue_forward(struct messaging_context *msg,
 599                                 void *private_data,
 600                                 uint32_t msg_type,
 601                                 struct server_id server_id,
 602                                 DATA_BLOB *data)
 603 {
 604         messaging_send_buf(msg, pid_to_procid(background_lpq_updater_pid),
 605                            MSG_PRINTER_UPDATE, data->data, data->length);
 606 }
 607
 608 static char *get_bq_logfile(void)
 609 {
 610         char *lfile = lp_logfile();
 611         int rc;
 612
 613         if (lfile == NULL || lfile[0] == '\0') {
 614                 rc = asprintf(&lfile, "%s/log.%s.bq",
 615                                         get_dyn_LOGFILEBASE(), DAEMON_NAME);
 616         } else {
 617                 rc = asprintf(&lfile, "%s.bq", lp_logfile());
 618         }
 619         if (rc == -1) {
 620                 lfile = NULL;
 621         }
 622         return lfile;
 623 }
 624
 625 pid_t start_spoolssd(struct tevent_context *ev_ctx,
 626                     struct messaging_context *msg_ctx)
 627 {
 628         struct rpc_srv_callbacks spoolss_cb;
 629         struct dcerpc_binding_vector *v;
 630         TALLOC_CTX *mem_ctx;
 631         pid_t pid;
 632         NTSTATUS status;
 633         int listen_fd;
 634         int ret;
 635         bool ok;
 636
 637         DEBUG(1, ("Forking SPOOLSS Daemon\n"));
 638
 639         /*
 640          * Block signals before forking child as it will have to
 641          * set its own handlers. Child will re-enable SIGHUP as
 642          * soon as the handlers are set up.
 643          */
 644         BlockSignals(true, SIGTERM);
 645         BlockSignals(true, SIGHUP);
 646
 647         pid = sys_fork();
 648
 649         if (pid == -1) {
 650                 DEBUG(0, ("Failed to fork SPOOLSS [%s]\n",
 651                            strerror(errno)));
 652         }
 653
 654         /* parent or error */
 655         if (pid != 0) {
 656
 657                 /* Re-enable SIGHUP before returnig */
 658                 BlockSignals(false, SIGTERM);
 659                 BlockSignals(false, SIGHUP);
 660                 return pid;
 661         }
 662
 663         /* child */
 664         close_low_fds(false);
 665
 666         status = reinit_after_fork(msg_ctx,
 667                                    ev_ctx,
 668                                    true);
 669         if (!NT_STATUS_IS_OK(status)) {
 670                 DEBUG(0,("reinit_after_fork() failed\n"));
 671                 smb_panic("reinit_after_fork() failed");
 672         }
 673
 674         /* save the parent process id so the children can use it later */
 675         parent_id = procid_self();
 676
 677         spoolss_reopen_logs(0);
 678         pfh_daemon_config(DAEMON_NAME,
 679                           &pf_spoolss_cfg,
 680                           &default_pf_spoolss_cfg);
 681
 682         spoolss_setup_sig_term_handler(ev_ctx);
 683         spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);
 684
 685         BlockSignals(false, SIGTERM);
 686         BlockSignals(false, SIGHUP);
 687
 688         /* always start the backgroundqueue listner in spoolssd */
 689         bq_logfile = get_bq_logfile();
 690         pid = start_background_queue(ev_ctx, msg_ctx, bq_logfile);
 691         if (pid > 0) {
 692                 background_lpq_updater_pid = pid;
 693         }
 694
 695         /* the listening fd must be created before the children are actually
 696          * forked out. */
 697         listen_fd = create_named_pipe_socket(SPOOLSS_PIPE_NAME);
 698         if (listen_fd == -1) {
 699                 exit(1);
 700         }
 701
 702         ret = listen(listen_fd, pf_spoolss_cfg.max_allowed_clients);
 703         if (ret == -1) {
 704                 DEBUG(0, ("Failed to listen on spoolss pipe - %s\n",
 705                           strerror(errno)));
 706                 exit(1);
 707         }
 708
 709         /* start children before any more initialization is done */
 710         ok = prefork_create_pool(ev_ctx, /* mem_ctx */
 711                                  ev_ctx, msg_ctx,
 712                                  1, &listen_fd,
 713                                  pf_spoolss_cfg.min_children,
 714                                  pf_spoolss_cfg.max_children,
 715                                  &spoolss_children_main, NULL,
 716                                  &spoolss_pool);
 717         if (!ok) {
 718                 exit(1);
 719         }
 720
 721         if (!serverid_register(procid_self(),
 722                                 FLAG_MSG_GENERAL |
 723                                 FLAG_MSG_PRINT_GENERAL)) {
 724                 exit(1);
 725         }
 726
 727         if (!locking_init()) {
 728                 exit(1);
 729         }
 730
 731         messaging_register(msg_ctx, ev_ctx,
 732                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 733         messaging_register(msg_ctx, NULL, MSG_PRINTER_UPDATE,
 734                            print_queue_forward);
 735         messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
 736                            pcap_updated);
 737         messaging_register(msg_ctx, ev_ctx,
 738                            MSG_PREFORK_CHILD_EVENT, child_ping);
 739
 740         /* As soon as messaging is up check if pcap has been loaded already.
 741          * If so then we probably missed a message and should load_printers()
 742          * ourselves. If pcap has not been loaded yet, then ignore, we will get
 743          * a message as soon as the bq process completes the reload. */
 744         if (pcap_cache_loaded()) {
 745                 load_printers(ev_ctx, msg_ctx);
 746         }
 747
 748         mem_ctx = talloc_new(NULL);
 749         if (mem_ctx == NULL) {
 750                 exit(1);
 751         }
 752
 753         /*
 754          * Initialize spoolss with an init function to convert printers first.
 755          * static_init_rpc will try to initialize the spoolss server too but you
 756          * can't register it twice.
 757          */
 758         spoolss_cb.init = spoolss_init_cb;
 759         spoolss_cb.shutdown = spoolss_shutdown_cb;
 760         spoolss_cb.private_data = msg_ctx;
 761
 762         status = rpc_winreg_init(NULL);
 763         if (!NT_STATUS_IS_OK(status)) {
 764                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 765                           nt_errstr(status)));
 766                 exit(1);
 767         }
 768
 769         status = rpc_spoolss_init(&spoolss_cb);
 770         if (!NT_STATUS_IS_OK(status)) {
 771                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 772                           nt_errstr(status)));
 773                 exit(1);
 774         }
 775
 776         status = dcerpc_binding_vector_new(mem_ctx, &v);
 777         if (!NT_STATUS_IS_OK(status)) {
 778                 DEBUG(0, ("Failed to create binding vector (%s)\n",
 779                           nt_errstr(status)));
 780                 exit(1);
 781         }
 782
 783         status = dcerpc_binding_vector_add_np_default(&ndr_table_spoolss, v);
 784         if (!NT_STATUS_IS_OK(status)) {
 785                 DEBUG(0, ("Failed to add np to binding vector (%s)\n",
 786                           nt_errstr(status)));
 787                 exit(1);
 788         }
 789
 790         status = rpc_ep_register(ev_ctx, msg_ctx, &ndr_table_spoolss, v);
 791         if (!NT_STATUS_IS_OK(status)) {
 792                 DEBUG(0, ("Failed to register spoolss endpoint! (%s)\n",
 793                           nt_errstr(status)));
 794                 exit(1);
 795         }
 796
 797         talloc_free(mem_ctx);
 798
 799         ok = spoolssd_setup_children_monitor(ev_ctx, msg_ctx);
 800         if (!ok) {
 801                 DEBUG(0, ("Failed to setup children monitoring!\n"));
 802                 exit(1);
 803         }
 804
 805         DEBUG(1, ("SPOOLSS Daemon Started (%d)\n", getpid()));
 806
 807         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 808
 809         /* loop forever */
 810         ret = tevent_loop_wait(ev_ctx);
 811
 812         /* should not be reached */
 813         DEBUG(0,("spoolssd tevent_loop_wait() exited with %d - %s\n",
 814                  ret, (ret == 0) ? "out of events" : strerror(errno)));
 815         exit(1);
 816 }