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/spoolss/srv_spoolss_nt.h"
  37 #include "librpc/rpc/dcerpc_ep.h"
  38 #include "lib/server_prefork.h"
  39 #include "lib/server_prefork_util.h"
  40
  41 #define SPOOLSS_PIPE_NAME "spoolss"
  42 #define DAEMON_NAME "spoolssd"
  43
  44 static struct server_id parent_id;
  45 static struct prefork_pool *spoolss_pool = NULL;
  46 static int spoolss_child_id = 0;
  47
  48 static struct pf_daemon_config default_pf_spoolss_cfg = {
  49         .prefork_status = PFH_INIT,
  50         .min_children = 5,
  51         .max_children = 25,
  52         .spawn_rate = 5,
  53         .max_allowed_clients = 100,
  54         .child_min_life = 60 /* 1 minute minimum life time */
  55 };
  56 static struct pf_daemon_config pf_spoolss_cfg = { 0 };
  57
  58 pid_t start_spoolssd(struct tevent_context *ev_ctx,
  59                      struct messaging_context *msg_ctx);
  60
  61 static void spoolss_reopen_logs(int child_id)
  62 {
  63         char *lfile = lp_logfile(talloc_tos());
  64         char *ext;
  65         int rc;
  66
  67         if (child_id) {
  68                 rc = asprintf(&ext, "%s.%d", DAEMON_NAME, child_id);
  69         } else {
  70                 rc = asprintf(&ext, "%s", DAEMON_NAME);
  71         }
  72
  73         if (rc == -1) {
  74                 return;
  75         }
  76
  77         rc = 0;
  78         if (lfile == NULL || lfile[0] == '\0') {
  79                 rc = asprintf(&lfile, "%s/log.%s",
  80                               get_dyn_LOGFILEBASE(), ext);
  81         } else {
  82                 if (strstr(lfile, ext) == NULL) {
  83                         if (child_id) {
  84                                 rc = asprintf(&lfile, "%s.%d",
  85                                               lp_logfile(talloc_tos()),
  86                                               child_id);
  87                         } else {
  88                                 rc = asprintf(&lfile, "%s.%s",
  89                                               lp_logfile(talloc_tos()),
  90                                               ext);
  91                         }
  92                 }
  93         }
  94
  95         if (rc > 0) {
  96                 lp_set_logfile(lfile);
  97                 SAFE_FREE(lfile);
  98         }
  99
 100         SAFE_FREE(ext);
 101
 102         reopen_logs();
 103 }
 104
 105 static void update_conf(struct tevent_context *ev,
 106                         struct messaging_context *msg)
 107 {
 108         change_to_root_user();
 109         lp_load(get_dyn_CONFIGFILE(), true, false, false, true);
 110         load_printers(ev, msg);
 111
 112         spoolss_reopen_logs(spoolss_child_id);
 113         if (spoolss_child_id == 0) {
 114                 pfh_daemon_config(DAEMON_NAME,
 115                                   &pf_spoolss_cfg,
 116                                   &default_pf_spoolss_cfg);
 117                 pfh_manage_pool(ev, msg, &pf_spoolss_cfg, spoolss_pool);
 118         }
 119 }
 120
 121 static void smb_conf_updated(struct messaging_context *msg,
 122                              void *private_data,
 123                              uint32_t msg_type,
 124                              struct server_id server_id,
 125                              DATA_BLOB *data)
 126 {
 127         struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
 128                                                              struct tevent_context);
 129
 130         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
 131         update_conf(ev_ctx, msg);
 132 }
 133
 134 static void update_pcap(struct tevent_context *ev_ctx,
 135                         struct messaging_context *msg_ctx)
 136 {
 137         change_to_root_user();
 138         delete_and_reload_printers(ev_ctx, msg_ctx);
 139 }
 140
 141 static void pcap_updated(struct messaging_context *msg,
 142                          void *private_data,
 143                          uint32_t msg_type,
 144                          struct server_id server_id,
 145                          DATA_BLOB *data)
 146 {
 147         struct tevent_context *ev_ctx;
 148
 149         ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
 150
 151         DEBUG(10, ("Got message that pcap updated. Reloading.\n"));
 152         update_pcap(ev_ctx, msg);
 153 }
 154
 155 static void spoolss_sig_term_handler(struct tevent_context *ev,
 156                                      struct tevent_signal *se,
 157                                      int signum,
 158                                      int count,
 159                                      void *siginfo,
 160                                      void *private_data)
 161 {
 162         exit_server_cleanly("termination signal");
 163 }
 164
 165 static void spoolss_setup_sig_term_handler(struct tevent_context *ev_ctx)
 166 {
 167         struct tevent_signal *se;
 168
 169         se = tevent_add_signal(ev_ctx,
 170                                ev_ctx,
 171                                SIGTERM, 0,
 172                                spoolss_sig_term_handler,
 173                                NULL);
 174         if (!se) {
 175                 exit_server("failed to setup SIGTERM handler");
 176         }
 177 }
 178
 179 static void spoolss_sig_hup_handler(struct tevent_context *ev,
 180                                     struct tevent_signal *se,
 181                                     int signum,
 182                                     int count,
 183                                     void *siginfo,
 184                                     void *pvt)
 185 {
 186         struct messaging_context *msg_ctx;
 187
 188         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 189
 190         DEBUG(1,("Reloading printers after SIGHUP\n"));
 191         update_conf(ev, msg_ctx);
 192
 193         /* relay to all children */
 194         if (spoolss_pool) {
 195                 prefork_send_signal_to_all(spoolss_pool, SIGHUP);
 196         }
 197 }
 198
 199 static void spoolss_setup_sig_hup_handler(struct tevent_context *ev_ctx,
 200                                           struct messaging_context *msg_ctx)
 201 {
 202         struct tevent_signal *se;
 203
 204         se = tevent_add_signal(ev_ctx,
 205                                ev_ctx,
 206                                SIGHUP, 0,
 207                                spoolss_sig_hup_handler,
 208                                msg_ctx);
 209         if (!se) {
 210                 exit_server("failed to setup SIGHUP handler");
 211         }
 212 }
 213
 214 static bool spoolss_init_cb(void *ptr)
 215 {
 216         struct messaging_context *msg_ctx = talloc_get_type_abort(
 217                 ptr, struct messaging_context);
 218
 219         return nt_printing_tdb_migrate(msg_ctx);
 220 }
 221
 222 static bool spoolss_shutdown_cb(void *ptr)
 223 {
 224         srv_spoolss_cleanup();
 225
 226         return true;
 227 }
 228
 229 /* Children */
 230
 231 static void spoolss_chld_sig_hup_handler(struct tevent_context *ev,
 232                                          struct tevent_signal *se,
 233                                          int signum,
 234                                          int count,
 235                                          void *siginfo,
 236                                          void *pvt)
 237 {
 238         struct messaging_context *msg_ctx;
 239
 240         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 241
 242         change_to_root_user();
 243         DEBUG(1,("Reloading printers after SIGHUP\n"));
 244         load_printers(ev, msg_ctx);
 245         spoolss_reopen_logs(spoolss_child_id);
 246 }
 247
 248 static bool spoolss_setup_chld_hup_handler(struct tevent_context *ev_ctx,
 249                                            struct messaging_context *msg_ctx,
 250                                            struct pf_worker_data *pf)
 251 {
 252         struct tevent_signal *se;
 253
 254         se = tevent_add_signal(ev_ctx,
 255                                ev_ctx,
 256                                SIGHUP, 0,
 257                                spoolss_chld_sig_hup_handler,
 258                                msg_ctx);
 259         if (!se) {
 260                 DEBUG(1, ("failed to setup SIGHUP handler"));
 261                 return false;
 262         }
 263
 264         return true;
 265 }
 266
 267 static void parent_ping(struct messaging_context *msg_ctx,
 268                         void *private_data,
 269                         uint32_t msg_type,
 270                         struct server_id server_id,
 271                         DATA_BLOB *data)
 272 {
 273
 274         /* The fact we received this message is enough to let make the event
 275          * loop if it was idle. spoolss_children_main will cycle through
 276          * spoolss_next_client at least once. That function will take whatever
 277          * action is necessary */
 278
 279         DEBUG(10, ("Got message that the parent changed status.\n"));
 280         return;
 281 }
 282
 283 static bool spoolss_child_init(struct tevent_context *ev_ctx,
 284                                int child_id, struct pf_worker_data *pf)
 285 {
 286         NTSTATUS status;
 287         struct rpc_srv_callbacks spoolss_cb;
 288         struct messaging_context *msg_ctx = messaging_init(NULL, ev_ctx);
 289         bool ok;
 290
 291         status = reinit_after_fork(msg_ctx, ev_ctx,
 292                                    true);
 293         if (!NT_STATUS_IS_OK(status)) {
 294                 DEBUG(0,("reinit_after_fork() failed\n"));
 295                 smb_panic("reinit_after_fork() failed");
 296         }
 297
 298         prctl_set_comment("spoolssd-child");
 299
 300         spoolss_child_id = child_id;
 301         spoolss_reopen_logs(child_id);
 302
 303         ok = spoolss_setup_chld_hup_handler(ev_ctx, msg_ctx, pf);
 304         if (!ok) {
 305                 return false;
 306         }
 307
 308         if (!serverid_register(messaging_server_id(msg_ctx),
 309                                 FLAG_MSG_GENERAL |
 310                                 FLAG_MSG_PRINT_GENERAL)) {
 311                 return false;
 312         }
 313
 314         if (!locking_init()) {
 315                 return false;
 316         }
 317
 318         messaging_register(msg_ctx, ev_ctx,
 319                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 320         messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
 321                            pcap_updated);
 322         messaging_register(msg_ctx, ev_ctx,
 323                            MSG_PREFORK_PARENT_EVENT, parent_ping);
 324
 325         /* As soon as messaging is up check if pcap has been loaded already.
 326          * If so then we probably missed a message and should load_printers()
 327          * ourselves. If pcap has not been loaded yet, then ignore, we will get
 328          * a message as soon as the bq process completes the reload. */
 329         if (pcap_cache_loaded()) {
 330                 load_printers(ev_ctx, msg_ctx);
 331         }
 332
 333         /* try to reinit rpc queues */
 334         spoolss_cb.init = spoolss_init_cb;
 335         spoolss_cb.shutdown = spoolss_shutdown_cb;
 336         spoolss_cb.private_data = msg_ctx;
 337
 338         status = rpc_winreg_init(NULL);
 339         if (!NT_STATUS_IS_OK(status)) {
 340                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 341                           nt_errstr(status)));
 342                 return false;
 343         }
 344
 345         status = rpc_spoolss_init(&spoolss_cb);
 346         if (!NT_STATUS_IS_OK(status)) {
 347                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 348                           nt_errstr(status)));
 349                 return false;
 350         }
 351
 352         return true;
 353 }
 354
 355 struct spoolss_children_data {
 356         struct tevent_context *ev_ctx;
 357         struct messaging_context *msg_ctx;
 358         struct pf_worker_data *pf;
 359         int listen_fd_size;
 360         int *listen_fds;
 361 };
 362
 363 static void spoolss_next_client(void *pvt);
 364
 365 static int spoolss_children_main(struct tevent_context *ev_ctx,
 366                                  struct messaging_context *msg_ctx,
 367                                  struct pf_worker_data *pf,
 368                                  int child_id,
 369                                  int listen_fd_size,
 370                                  int *listen_fds,
 371                                  void *private_data)
 372 {
 373         struct spoolss_children_data *data;
 374         bool ok;
 375         int ret;
 376
 377         ok = spoolss_child_init(ev_ctx, child_id, pf);
 378         if (!ok) {
 379                 return 1;
 380         }
 381
 382         data = talloc(ev_ctx, struct spoolss_children_data);
 383         if (!data) {
 384                 return 1;
 385         }
 386         data->pf = pf;
 387         data->ev_ctx = ev_ctx;
 388         data->msg_ctx = msg_ctx;
 389         data->listen_fd_size = listen_fd_size;
 390         data->listen_fds = listen_fds;
 391
 392         /* loop until it is time to exit */
 393         while (pf->status != PF_WORKER_EXITING) {
 394                 /* try to see if it is time to schedule the next client */
 395                 spoolss_next_client(data);
 396
 397                 ret = tevent_loop_once(ev_ctx);
 398                 if (ret != 0) {
 399                         DEBUG(0, ("tevent_loop_once() exited with %d: %s\n",
 400                                   ret, strerror(errno)));
 401                         pf->status = PF_WORKER_EXITING;
 402                 }
 403         }
 404
 405         return ret;
 406 }
 407
 408 static void spoolss_client_terminated(void *pvt)
 409 {
 410         struct spoolss_children_data *data;
 411
 412         data = talloc_get_type_abort(pvt, struct spoolss_children_data);
 413
 414         pfh_client_terminated(data->pf);
 415
 416         spoolss_next_client(pvt);
 417 }
 418
 419 struct spoolss_new_client {
 420         struct spoolss_children_data *data;
 421         struct tsocket_address *srv_addr;
 422         struct tsocket_address *cli_addr;
 423 };
 424
 425 static void spoolss_handle_client(struct tevent_req *req);
 426
 427 static void spoolss_next_client(void *pvt)
 428 {
 429         struct tevent_req *req;
 430         struct spoolss_children_data *data;
 431         struct spoolss_new_client *next;
 432
 433         data = talloc_get_type_abort(pvt, struct spoolss_children_data);
 434
 435         if (!pfh_child_allowed_to_accept(data->pf)) {
 436                 /* nothing to do for now we are already listening
 437                  * or we are not allowed to listen further */
 438                 return;
 439         }
 440
 441         next = talloc_zero(data, struct spoolss_new_client);
 442         if (!next) {
 443                 DEBUG(1, ("Out of memory!?\n"));
 444                 return;
 445         }
 446         next->data = data;
 447
 448         req = prefork_listen_send(next, data->ev_ctx, data->pf,
 449                                   data->listen_fd_size,
 450                                   data->listen_fds);
 451         if (!req) {
 452                 DEBUG(1, ("Failed to make listening request!?\n"));
 453                 talloc_free(next);
 454                 return;
 455         }
 456         tevent_req_set_callback(req, spoolss_handle_client, next);
 457 }
 458
 459 static void spoolss_handle_client(struct tevent_req *req)
 460 {
 461         struct spoolss_children_data *data;
 462         struct spoolss_new_client *client;
 463         const DATA_BLOB ping = data_blob_null;
 464         int ret;
 465         int sd;
 466
 467         client = tevent_req_callback_data(req, struct spoolss_new_client);
 468         data = client->data;
 469
 470         ret = prefork_listen_recv(req, client, &sd,
 471                                   &client->srv_addr, &client->cli_addr);
 472
 473         /* this will free the request too */
 474         talloc_free(client);
 475
 476         if (ret != 0) {
 477                 DEBUG(6, ("No client connection was available after all!\n"));
 478                 return;
 479         }
 480
 481         /* Warn parent that our status changed */
 482         messaging_send(data->msg_ctx, parent_id,
 483                         MSG_PREFORK_CHILD_EVENT, &ping);
 484
 485         DEBUG(2, ("Spoolss preforked child %d got client connection!\n",
 486                   (int)(data->pf->pid)));
 487
 488         named_pipe_accept_function(data->ev_ctx, data->msg_ctx,
 489                                    SPOOLSS_PIPE_NAME, sd,
 490                                    spoolss_client_terminated, data);
 491 }
 492
 493 /* ==== Main Process Functions ==== */
 494
 495 extern pid_t background_lpq_updater_pid;
 496 static char *bq_logfile;
 497
 498 static void check_updater_child(struct tevent_context *ev_ctx,
 499                                 struct messaging_context *msg_ctx)
 500 {
 501         int status;
 502         pid_t pid;
 503
 504         if (background_lpq_updater_pid == -1) {
 505                 return;
 506         }
 507
 508         pid = sys_waitpid(background_lpq_updater_pid, &status, WNOHANG);
 509         if (pid > 0) {
 510                 DEBUG(2, ("The background queue child died... Restarting!\n"));
 511                 pid = start_background_queue(ev_ctx, msg_ctx, bq_logfile);
 512                 background_lpq_updater_pid = pid;
 513         }
 514 }
 515
 516 static void child_ping(struct messaging_context *msg_ctx,
 517                         void *private_data,
 518                         uint32_t msg_type,
 519                         struct server_id server_id,
 520                         DATA_BLOB *data)
 521 {
 522         struct tevent_context *ev_ctx;
 523
 524         ev_ctx = talloc_get_type_abort(private_data, struct tevent_context);
 525
 526         DEBUG(10, ("Got message that a child changed status.\n"));
 527         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 528 }
 529
 530 static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
 531                                     struct messaging_context *msg_ctx,
 532                                     struct timeval current_time);
 533 static void spoolssd_check_children(struct tevent_context *ev_ctx,
 534                                     struct tevent_timer *te,
 535                                     struct timeval current_time,
 536                                     void *pvt);
 537
 538 static void spoolssd_sigchld_handler(struct tevent_context *ev_ctx,
 539                                      struct prefork_pool *pfp,
 540                                      void *pvt)
 541 {
 542         struct messaging_context *msg_ctx;
 543
 544         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 545
 546         /* run pool management so we can fork/retire or increase
 547          * the allowed connections per child based on load */
 548         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 549
 550         /* also check if the updater child is alive and well */
 551         check_updater_child(ev_ctx, msg_ctx);
 552 }
 553
 554 static bool spoolssd_setup_children_monitor(struct tevent_context *ev_ctx,
 555                                             struct messaging_context *msg_ctx)
 556 {
 557         bool ok;
 558
 559         /* add our oun sigchld callback */
 560         prefork_set_sigchld_callback(spoolss_pool,
 561                                      spoolssd_sigchld_handler, msg_ctx);
 562
 563         ok = spoolssd_schedule_check(ev_ctx, msg_ctx,
 564                                      tevent_timeval_current());
 565         return ok;
 566 }
 567
 568 static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
 569                                     struct messaging_context *msg_ctx,
 570                                     struct timeval current_time)
 571 {
 572         struct tevent_timer *te;
 573         struct timeval next_event;
 574
 575         /* check situation again in 10 seconds */
 576         next_event = tevent_timeval_current_ofs(10, 0);
 577
 578         /* TODO: check when the socket becomes readable, so that children
 579          * are checked only when there is some activity ? */
 580         te = tevent_add_timer(ev_ctx, spoolss_pool, next_event,
 581                                 spoolssd_check_children, msg_ctx);
 582         if (!te) {
 583                 DEBUG(2, ("Failed to set up children monitoring!\n"));
 584                 return false;
 585         }
 586
 587         return true;
 588 }
 589
 590 static void spoolssd_check_children(struct tevent_context *ev_ctx,
 591                                     struct tevent_timer *te,
 592                                     struct timeval current_time,
 593                                     void *pvt)
 594 {
 595         struct messaging_context *msg_ctx;
 596
 597         msg_ctx = talloc_get_type_abort(pvt, struct messaging_context);
 598
 599         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 600
 601         spoolssd_schedule_check(ev_ctx, msg_ctx, current_time);
 602 }
 603
 604 static void print_queue_forward(struct messaging_context *msg,
 605                                 void *private_data,
 606                                 uint32_t msg_type,
 607                                 struct server_id server_id,
 608                                 DATA_BLOB *data)
 609 {
 610         messaging_send_buf(msg, pid_to_procid(background_lpq_updater_pid),
 611                            MSG_PRINTER_UPDATE, data->data, data->length);
 612 }
 613
 614 static char *get_bq_logfile(void)
 615 {
 616         char *lfile = lp_logfile(talloc_tos());
 617         int rc;
 618
 619         if (lfile == NULL || lfile[0] == '\0') {
 620                 rc = asprintf(&lfile, "%s/log.%s.bq",
 621                                         get_dyn_LOGFILEBASE(), DAEMON_NAME);
 622         } else {
 623                 rc = asprintf(&lfile, "%s.bq", lp_logfile(talloc_tos()));
 624         }
 625         if (rc == -1) {
 626                 lfile = NULL;
 627         }
 628         return lfile;
 629 }
 630
 631 pid_t start_spoolssd(struct tevent_context *ev_ctx,
 632                     struct messaging_context *msg_ctx)
 633 {
 634         struct rpc_srv_callbacks spoolss_cb;
 635         struct dcerpc_binding_vector *v;
 636         TALLOC_CTX *mem_ctx;
 637         pid_t pid;
 638         NTSTATUS status;
 639         int listen_fd;
 640         int ret;
 641         bool ok;
 642
 643         DEBUG(1, ("Forking SPOOLSS Daemon\n"));
 644
 645         /*
 646          * Block signals before forking child as it will have to
 647          * set its own handlers. Child will re-enable SIGHUP as
 648          * soon as the handlers are set up.
 649          */
 650         BlockSignals(true, SIGTERM);
 651         BlockSignals(true, SIGHUP);
 652
 653         pid = fork();
 654
 655         if (pid == -1) {
 656                 DEBUG(0, ("Failed to fork SPOOLSS [%s]\n",
 657                            strerror(errno)));
 658         }
 659
 660         /* parent or error */
 661         if (pid != 0) {
 662
 663                 /* Re-enable SIGHUP before returnig */
 664                 BlockSignals(false, SIGTERM);
 665                 BlockSignals(false, SIGHUP);
 666                 return pid;
 667         }
 668
 669         status = reinit_after_fork(msg_ctx,
 670                                    ev_ctx,
 671                                    true);
 672         if (!NT_STATUS_IS_OK(status)) {
 673                 DEBUG(0,("reinit_after_fork() failed\n"));
 674                 smb_panic("reinit_after_fork() failed");
 675         }
 676
 677         prctl_set_comment("spoolssd-master");
 678
 679         /* save the parent process id so the children can use it later */
 680         parent_id = messaging_server_id(msg_ctx);
 681
 682         spoolss_reopen_logs(0);
 683         pfh_daemon_config(DAEMON_NAME,
 684                           &pf_spoolss_cfg,
 685                           &default_pf_spoolss_cfg);
 686
 687         spoolss_setup_sig_term_handler(ev_ctx);
 688         spoolss_setup_sig_hup_handler(ev_ctx, msg_ctx);
 689
 690         BlockSignals(false, SIGTERM);
 691         BlockSignals(false, SIGHUP);
 692
 693         /* always start the backgroundqueue listner in spoolssd */
 694         bq_logfile = get_bq_logfile();
 695         pid = start_background_queue(ev_ctx, msg_ctx, bq_logfile);
 696         if (pid > 0) {
 697                 background_lpq_updater_pid = pid;
 698         }
 699
 700         /* the listening fd must be created before the children are actually
 701          * forked out. */
 702         listen_fd = create_named_pipe_socket(SPOOLSS_PIPE_NAME);
 703         if (listen_fd == -1) {
 704                 exit(1);
 705         }
 706
 707         ret = listen(listen_fd, pf_spoolss_cfg.max_allowed_clients);
 708         if (ret == -1) {
 709                 DEBUG(0, ("Failed to listen on spoolss pipe - %s\n",
 710                           strerror(errno)));
 711                 exit(1);
 712         }
 713
 714         /* start children before any more initialization is done */
 715         ok = prefork_create_pool(ev_ctx, /* mem_ctx */
 716                                  ev_ctx, msg_ctx,
 717                                  1, &listen_fd,
 718                                  pf_spoolss_cfg.min_children,
 719                                  pf_spoolss_cfg.max_children,
 720                                  &spoolss_children_main, NULL,
 721                                  &spoolss_pool);
 722         if (!ok) {
 723                 exit(1);
 724         }
 725
 726         if (!serverid_register(messaging_server_id(msg_ctx),
 727                                 FLAG_MSG_GENERAL |
 728                                 FLAG_MSG_PRINT_GENERAL)) {
 729                 exit(1);
 730         }
 731
 732         if (!locking_init()) {
 733                 exit(1);
 734         }
 735
 736         messaging_register(msg_ctx, ev_ctx,
 737                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 738         messaging_register(msg_ctx, NULL, MSG_PRINTER_UPDATE,
 739                            print_queue_forward);
 740         messaging_register(msg_ctx, ev_ctx, MSG_PRINTER_PCAP,
 741                            pcap_updated);
 742         messaging_register(msg_ctx, ev_ctx,
 743                            MSG_PREFORK_CHILD_EVENT, child_ping);
 744
 745         /* As soon as messaging is up check if pcap has been loaded already.
 746          * If so then we probably missed a message and should load_printers()
 747          * ourselves. If pcap has not been loaded yet, then ignore, we will get
 748          * a message as soon as the bq process completes the reload. */
 749         if (pcap_cache_loaded()) {
 750                 load_printers(ev_ctx, msg_ctx);
 751         }
 752
 753         mem_ctx = talloc_new(NULL);
 754         if (mem_ctx == NULL) {
 755                 exit(1);
 756         }
 757
 758         /*
 759          * Initialize spoolss with an init function to convert printers first.
 760          * static_init_rpc will try to initialize the spoolss server too but you
 761          * can't register it twice.
 762          */
 763         spoolss_cb.init = spoolss_init_cb;
 764         spoolss_cb.shutdown = spoolss_shutdown_cb;
 765         spoolss_cb.private_data = msg_ctx;
 766
 767         status = rpc_winreg_init(NULL);
 768         if (!NT_STATUS_IS_OK(status)) {
 769                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 770                           nt_errstr(status)));
 771                 exit(1);
 772         }
 773
 774         status = rpc_spoolss_init(&spoolss_cb);
 775         if (!NT_STATUS_IS_OK(status)) {
 776                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 777                           nt_errstr(status)));
 778                 exit(1);
 779         }
 780
 781         status = dcerpc_binding_vector_new(mem_ctx, &v);
 782         if (!NT_STATUS_IS_OK(status)) {
 783                 DEBUG(0, ("Failed to create binding vector (%s)\n",
 784                           nt_errstr(status)));
 785                 exit(1);
 786         }
 787
 788         status = dcerpc_binding_vector_add_np_default(&ndr_table_spoolss, v);
 789         if (!NT_STATUS_IS_OK(status)) {
 790                 DEBUG(0, ("Failed to add np to binding vector (%s)\n",
 791                           nt_errstr(status)));
 792                 exit(1);
 793         }
 794
 795         status = rpc_ep_register(ev_ctx, msg_ctx, &ndr_table_spoolss, v);
 796         if (!NT_STATUS_IS_OK(status)) {
 797                 DEBUG(0, ("Failed to register spoolss endpoint! (%s)\n",
 798                           nt_errstr(status)));
 799                 exit(1);
 800         }
 801
 802         talloc_free(mem_ctx);
 803
 804         ok = spoolssd_setup_children_monitor(ev_ctx, msg_ctx);
 805         if (!ok) {
 806                 DEBUG(0, ("Failed to setup children monitoring!\n"));
 807                 exit(1);
 808         }
 809
 810         DEBUG(1, ("SPOOLSS Daemon Started (%u)\n", (unsigned int)getpid()));
 811
 812         pfh_manage_pool(ev_ctx, msg_ctx, &pf_spoolss_cfg, spoolss_pool);
 813
 814         /* loop forever */
 815         ret = tevent_loop_wait(ev_ctx);
 816
 817         /* should not be reached */
 818         DEBUG(0,("spoolssd tevent_loop_wait() exited with %d - %s\n",
 819                  ret, (ret == 0) ? "out of events" : strerror(errno)));
 820         exit(1);
 821 }