source3/printing/spoolssd.c

   1 /*
   2    Unix SMB/Netbios implementation.
   3    SPOOLSS Daemon
   4    Copyright (C) Simo Sorce 2010
   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 "ntdomain.h"
  29 #include "librpc/gen_ndr/srv_winreg.h"
  30 #include "librpc/gen_ndr/srv_spoolss.h"
  31 #include "rpc_server/rpc_server.h"
  32 #include "rpc_server/rpc_ep_register.h"
  33 #include "rpc_server/spoolss/srv_spoolss_nt.h"
  34 #include "librpc/rpc/dcerpc_ep.h"
  35 #include "lib/server_prefork.h"
  36
  37 #define SPOOLSS_PIPE_NAME "spoolss"
  38 #define DAEMON_NAME "spoolssd"
  39
  40 #define SPOOLSS_MIN_CHILDREN 5
  41 #define SPOOLSS_MAX_CHILDREN 25
  42 #define SPOOLSS_SPAWN_RATE 5
  43 #define SPOOLSS_MIN_LIFE 60 /* 1 minute minimum life time */
  44
  45 #define SPOOLSS_ALL_FINE 0x00
  46 #define SPOOLSS_NEW_MAX  0x01
  47 #define SPOLLSS_ENOSPC   0x02
  48
  49 static int spoolss_min_children;
  50 static int spoolss_max_children;
  51 static int spoolss_spawn_rate;
  52 static int spoolss_prefork_status;
  53
  54 static void spoolss_prefork_config(void)
  55 {
  56         static int spoolss_prefork_config_init = false;
  57         const char *prefork_str;
  58         int min, max, rate;
  59         bool use_defaults = false;
  60         int ret;
  61
  62         if (!spoolss_prefork_config_init) {
  63                 spoolss_prefork_status = SPOOLSS_ALL_FINE;
  64                 spoolss_min_children = 0;
  65                 spoolss_max_children = 0;
  66                 spoolss_spawn_rate = 0;
  67                 spoolss_prefork_config_init = true;
  68         }
  69
  70         prefork_str = lp_parm_const_string(GLOBAL_SECTION_SNUM,
  71                                            "spoolssd", "prefork", "none");
  72         if (strcmp(prefork_str, "none") == 0) {
  73                 use_defaults = true;
  74         } else {
  75                 ret = sscanf(prefork_str, "%d:%d:%d", &min, &max, &rate);
  76                 if (ret != 3) {
  77                         DEBUG(0, ("invalid format for spoolssd:prefork!\n"));
  78                         use_defaults = true;
  79                 }
  80         }
  81
  82         if (use_defaults) {
  83                 min = SPOOLSS_MIN_CHILDREN;
  84                 max = SPOOLSS_MAX_CHILDREN;
  85                 rate = SPOOLSS_SPAWN_RATE;
  86         }
  87
  88         if (max > spoolss_max_children && spoolss_max_children != 0) {
  89                 spoolss_prefork_status |= SPOOLSS_NEW_MAX;
  90         }
  91
  92         spoolss_min_children = min;
  93         spoolss_max_children = max;
  94         spoolss_spawn_rate = rate;
  95 }
  96
  97 static void spoolss_reopen_logs(void)
  98 {
  99         char *lfile = lp_logfile();
 100         int rc;
 101
 102         if (lfile == NULL || lfile[0] == '\0') {
 103                 rc = asprintf(&lfile, "%s/log.%s", get_dyn_LOGFILEBASE(), DAEMON_NAME);
 104                 if (rc > 0) {
 105                         lp_set_logfile(lfile);
 106                         SAFE_FREE(lfile);
 107                 }
 108         } else {
 109                 if (strstr(lfile, DAEMON_NAME) == NULL) {
 110                         rc = asprintf(&lfile, "%s.%s", lp_logfile(), DAEMON_NAME);
 111                         if (rc > 0) {
 112                                 lp_set_logfile(lfile);
 113                                 SAFE_FREE(lfile);
 114                         }
 115                 }
 116         }
 117
 118         reopen_logs();
 119 }
 120
 121 static void update_conf(struct tevent_context *ev,
 122                         struct messaging_context *msg)
 123 {
 124         change_to_root_user();
 125         lp_load(get_dyn_CONFIGFILE(), true, false, false, true);
 126         reload_printers(ev, msg);
 127
 128         spoolss_reopen_logs();
 129         spoolss_prefork_config();
 130 }
 131
 132 static void smb_conf_updated(struct messaging_context *msg,
 133                              void *private_data,
 134                              uint32_t msg_type,
 135                              struct server_id server_id,
 136                              DATA_BLOB *data)
 137 {
 138         struct tevent_context *ev_ctx = talloc_get_type_abort(private_data,
 139                                                              struct tevent_context);
 140
 141         DEBUG(10, ("Got message saying smb.conf was updated. Reloading.\n"));
 142         update_conf(ev_ctx, msg);
 143 }
 144
 145 static void spoolss_sig_term_handler(struct tevent_context *ev,
 146                                      struct tevent_signal *se,
 147                                      int signum,
 148                                      int count,
 149                                      void *siginfo,
 150                                      void *private_data)
 151 {
 152         exit_server_cleanly("termination signal");
 153 }
 154
 155 static void spoolss_setup_sig_term_handler(struct tevent_context *ev_ctx)
 156 {
 157         struct tevent_signal *se;
 158
 159         se = tevent_add_signal(ev_ctx,
 160                                ev_ctx,
 161                                SIGTERM, 0,
 162                                spoolss_sig_term_handler,
 163                                NULL);
 164         if (!se) {
 165                 exit_server("failed to setup SIGTERM handler");
 166         }
 167 }
 168
 169 struct spoolss_hup_ctx {
 170         struct messaging_context *msg_ctx;
 171         struct prefork_pool *pfp;
 172 };
 173
 174 static void spoolss_sig_hup_handler(struct tevent_context *ev,
 175                                     struct tevent_signal *se,
 176                                     int signum,
 177                                     int count,
 178                                     void *siginfo,
 179                                     void *pvt)
 180 {
 181         struct spoolss_hup_ctx *hup_ctx;
 182
 183         hup_ctx = talloc_get_type_abort(pvt, struct spoolss_hup_ctx);
 184
 185         DEBUG(1,("Reloading printers after SIGHUP\n"));
 186         update_conf(ev, hup_ctx->msg_ctx);
 187
 188         /* relay to all children */
 189         prefork_send_signal_to_all(hup_ctx->pfp, SIGHUP);
 190 }
 191
 192 static void spoolss_setup_sig_hup_handler(struct tevent_context *ev_ctx,
 193                                           struct prefork_pool *pfp,
 194                                           struct messaging_context *msg_ctx)
 195 {
 196         struct spoolss_hup_ctx *hup_ctx;
 197         struct tevent_signal *se;
 198
 199         hup_ctx = talloc(ev_ctx, struct spoolss_hup_ctx);
 200         if (!hup_ctx) {
 201                 exit_server("failed to setup SIGHUP handler");
 202         }
 203         hup_ctx->pfp = pfp;
 204         hup_ctx->msg_ctx = msg_ctx;
 205
 206         se = tevent_add_signal(ev_ctx,
 207                                ev_ctx,
 208                                SIGHUP, 0,
 209                                spoolss_sig_hup_handler,
 210                                hup_ctx);
 211         if (!se) {
 212                 exit_server("failed to setup SIGHUP handler");
 213         }
 214 }
 215
 216 static bool spoolss_init_cb(void *ptr)
 217 {
 218         struct messaging_context *msg_ctx = talloc_get_type_abort(
 219                 ptr, struct messaging_context);
 220
 221         return nt_printing_tdb_migrate(msg_ctx);
 222 }
 223
 224 static bool spoolss_shutdown_cb(void *ptr)
 225 {
 226         srv_spoolss_cleanup();
 227
 228         return true;
 229 }
 230
 231 /* Childrens */
 232
 233 struct spoolss_chld_sig_hup_ctx {
 234         struct messaging_context *msg_ctx;
 235         struct pf_worker_data *pf;
 236 };
 237
 238 static void spoolss_chld_sig_hup_handler(struct tevent_context *ev,
 239                                          struct tevent_signal *se,
 240                                          int signum,
 241                                          int count,
 242                                          void *siginfo,
 243                                          void *pvt)
 244 {
 245         struct spoolss_chld_sig_hup_ctx *shc;
 246
 247         shc = talloc_get_type_abort(pvt, struct spoolss_chld_sig_hup_ctx);
 248
 249         /* avoid wasting CPU cycles if we are going to exit soon anyways */
 250         if (shc->pf != NULL &&
 251             shc->pf->cmds == PF_SRV_MSG_EXIT) {
 252                 return;
 253         }
 254
 255         change_to_root_user();
 256         DEBUG(1,("Reloading printers after SIGHUP\n"));
 257         reload_printers(ev, shc->msg_ctx);
 258         spoolss_reopen_logs();
 259 }
 260
 261 static bool spoolss_setup_chld_hup_handler(struct tevent_context *ev_ctx,
 262                                            struct pf_worker_data *pf,
 263                                            struct messaging_context *msg_ctx)
 264 {
 265         struct spoolss_chld_sig_hup_ctx *shc;
 266         struct tevent_signal *se;
 267
 268         shc = talloc(ev_ctx, struct spoolss_chld_sig_hup_ctx);
 269         if (!shc) {
 270                 DEBUG(1, ("failed to setup SIGHUP handler"));
 271                 return false;
 272         }
 273         shc->pf = pf;
 274         shc->msg_ctx = msg_ctx;
 275
 276         se = tevent_add_signal(ev_ctx,
 277                                ev_ctx,
 278                                SIGHUP, 0,
 279                                spoolss_chld_sig_hup_handler,
 280                                shc);
 281         if (!se) {
 282                 DEBUG(1, ("failed to setup SIGHUP handler"));
 283                 return false;
 284         }
 285
 286         return true;
 287 }
 288
 289 static bool spoolss_child_init(struct tevent_context *ev_ctx,
 290                                         struct pf_worker_data *pf)
 291 {
 292         NTSTATUS status;
 293         struct rpc_srv_callbacks spoolss_cb;
 294         struct messaging_context *msg_ctx = server_messaging_context();
 295         bool ok;
 296
 297         status = reinit_after_fork(msg_ctx, ev_ctx,
 298                                    procid_self(), true);
 299         if (!NT_STATUS_IS_OK(status)) {
 300                 DEBUG(0,("reinit_after_fork() failed\n"));
 301                 smb_panic("reinit_after_fork() failed");
 302         }
 303
 304         spoolss_reopen_logs();
 305
 306         ok = spoolss_setup_chld_hup_handler(ev_ctx, pf, msg_ctx);
 307         if (!ok) {
 308                 return false;
 309         }
 310
 311         if (!serverid_register(procid_self(), FLAG_MSG_GENERAL)) {
 312                 return false;
 313         }
 314
 315         if (!locking_init()) {
 316                 return false;
 317         }
 318
 319         messaging_register(msg_ctx, ev_ctx,
 320                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 321
 322         /* try to reinit rpc queues */
 323         spoolss_cb.init = spoolss_init_cb;
 324         spoolss_cb.shutdown = spoolss_shutdown_cb;
 325         spoolss_cb.private_data = msg_ctx;
 326
 327         status = rpc_winreg_init(NULL);
 328         if (!NT_STATUS_IS_OK(status)) {
 329                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 330                           nt_errstr(status)));
 331                 return false;
 332         }
 333
 334         status = rpc_spoolss_init(&spoolss_cb);
 335         if (!NT_STATUS_IS_OK(status)) {
 336                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 337                           nt_errstr(status)));
 338                 return false;
 339         }
 340
 341         reload_printers(ev_ctx, msg_ctx);
 342
 343         return true;
 344 }
 345
 346 struct spoolss_children_data {
 347         struct tevent_context *ev_ctx;
 348         struct messaging_context *msg_ctx;
 349         struct pf_worker_data *pf;
 350         int listen_fd_size;
 351         int *listen_fds;
 352         int lock_fd;
 353
 354         bool listening;
 355 };
 356
 357 static void spoolss_next_client(void *pvt);
 358
 359 static int spoolss_children_main(struct tevent_context *ev_ctx,
 360                                  struct pf_worker_data *pf,
 361                                  int listen_fd_size,
 362                                  int *listen_fds,
 363                                  int lock_fd,
 364                                  void *private_data)
 365 {
 366         struct messaging_context *msg_ctx = server_messaging_context();
 367         struct spoolss_children_data *data;
 368         bool ok;
 369         int ret;
 370
 371         ok = spoolss_child_init(ev_ctx, 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->lock_fd = lock_fd;
 384         data->listen_fd_size = listen_fd_size;
 385         data->listen_fds = listen_fds;
 386         data->listening = false;
 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         if (data->pf->num_clients) {
 411                 data->pf->num_clients--;
 412         } else {
 413                 DEBUG(2, ("Invalid num clients, aborting!\n"));
 414                 data->pf->status = PF_WORKER_EXITING;
 415                 return;
 416         }
 417
 418         spoolss_next_client(pvt);
 419 }
 420
 421 struct spoolss_new_client {
 422         struct spoolss_children_data *data;
 423         struct sockaddr_un sunaddr;
 424         socklen_t addrlen;
 425 };
 426
 427 static void spoolss_handle_client(struct tevent_req *req);
 428
 429 static void spoolss_next_client(void *pvt)
 430 {
 431         struct tevent_req *req;
 432         struct spoolss_children_data *data;
 433         struct spoolss_new_client *next;
 434
 435         data = talloc_get_type_abort(pvt, struct spoolss_children_data);
 436
 437         if (data->pf->num_clients == 0) {
 438                 data->pf->status = PF_WORKER_IDLE;
 439         }
 440
 441         if (data->pf->cmds == PF_SRV_MSG_EXIT) {
 442                 DEBUG(2, ("Parent process commands we terminate!\n"));
 443                 return;
 444         }
 445
 446         if (data->listening ||
 447             data->pf->num_clients >= data->pf->allowed_clients) {
 448                 /* nothing to do for now we are already listening
 449                  * or reached the number of clients we are allowed
 450                  * to handle in parallel */
 451                 return;
 452         }
 453
 454         next = talloc_zero(data, struct spoolss_new_client);
 455         if (!next) {
 456                 DEBUG(1, ("Out of memory!?\n"));
 457                 return;
 458         }
 459         next->data = data;
 460         next->addrlen = sizeof(next->sunaddr);
 461
 462         req = prefork_listen_send(next, data->ev_ctx, data->pf,
 463                                   data->listen_fd_size,
 464                                   data->listen_fds,
 465                                   data->lock_fd,
 466                                   (struct sockaddr *)&next->sunaddr,
 467                                   &next->addrlen);
 468         if (!req) {
 469                 DEBUG(1, ("Failed to make listening request!?\n"));
 470                 talloc_free(next);
 471                 return;
 472         }
 473         tevent_req_set_callback(req, spoolss_handle_client, next);
 474
 475         data->listening = true;
 476 }
 477
 478 static void spoolss_handle_client(struct tevent_req *req)
 479 {
 480         struct spoolss_children_data *data;
 481         struct spoolss_new_client *client;
 482         int ret;
 483         int sd;
 484
 485         client = tevent_req_callback_data(req, struct spoolss_new_client);
 486         data = client->data;
 487
 488         ret = prefork_listen_recv(req, &sd);
 489
 490         /* this will free the request too */
 491         talloc_free(client);
 492         /* we are done listening */
 493         data->listening = false;
 494
 495         if (ret > 0) {
 496                 DEBUG(1, ("Failed to accept client connection!\n"));
 497                 /* bail out if we are not serving any other client */
 498                 if (data->pf->num_clients == 0) {
 499                         data->pf->status = PF_WORKER_EXITING;
 500                 }
 501                 return;
 502         }
 503
 504         if (ret == -2) {
 505                 DEBUG(1, ("Server asks us to die!\n"));
 506                 data->pf->status = PF_WORKER_EXITING;
 507                 return;
 508         }
 509
 510         DEBUG(2, ("Spoolss preforked child %d got client connection!\n",
 511                   (int)(data->pf->pid)));
 512
 513         named_pipe_accept_function(data->ev_ctx, data->msg_ctx,
 514                                    SPOOLSS_PIPE_NAME, sd,
 515                                    spoolss_client_terminated, data);
 516 }
 517
 518 /* ==== Main Process Functions ==== */
 519
 520 extern pid_t background_lpq_updater_pid;
 521
 522 static void check_updater_child(void)
 523 {
 524         int status;
 525         pid_t pid;
 526
 527         if (background_lpq_updater_pid == -1) {
 528                 return;
 529         }
 530
 531         pid = sys_waitpid(background_lpq_updater_pid, &status, WNOHANG);
 532         if (pid > 0) {
 533                 DEBUG(2, ("The background queue child died... Restarting!\n"));
 534                 pid = start_background_queue(server_event_context(),
 535                                              server_messaging_context());
 536                 background_lpq_updater_pid = pid;
 537         }
 538 }
 539
 540 static void spoolssd_sig_chld_handler(struct tevent_context *ev_ctx,
 541                                       struct tevent_signal *se,
 542                                       int signum, int count,
 543                                       void *siginfo, void *pvt)
 544 {
 545         struct prefork_pool *pfp;
 546         int active, total;
 547         int n, r;
 548
 549         pfp = talloc_get_type_abort(pvt, struct prefork_pool);
 550
 551         /* run the cleanup function to make sure all dead children are
 552          * properly and timely retired. */
 553         prefork_cleanup_loop(pfp);
 554
 555         /* now check we do not descend below the minimum */
 556         active = prefork_count_active_children(pfp, &total);
 557
 558         n = 0;
 559         if (total < spoolss_min_children) {
 560                 n = total - spoolss_min_children;
 561         } else if (total - active < (total / 4)) {
 562                 n = spoolss_min_children;
 563         }
 564
 565         if (n > 0) {
 566                 r = prefork_add_children(ev_ctx, pfp, n);
 567                 if (r < n) {
 568                         DEBUG(10, ("Tried to start %d children but only,"
 569                                    "%d were actually started.!\n", n, r));
 570                 }
 571         }
 572
 573         /* also check if the updater child is alive and well */
 574         check_updater_child();
 575 }
 576
 577 static bool spoolssd_setup_sig_chld_handler(struct tevent_context *ev_ctx,
 578                                             struct prefork_pool *pfp)
 579 {
 580         struct tevent_signal *se;
 581
 582         se = tevent_add_signal(ev_ctx, ev_ctx, SIGCHLD, 0,
 583                                 spoolssd_sig_chld_handler, pfp);
 584         if (!se) {
 585                 DEBUG(0, ("Failed to setup SIGCHLD handler!\n"));
 586                 return false;
 587         }
 588
 589         return true;
 590 }
 591
 592 static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
 593                                     struct prefork_pool *pfp,
 594                                     struct timeval current_time);
 595 static void spoolssd_check_children(struct tevent_context *ev_ctx,
 596                                     struct tevent_timer *te,
 597                                     struct timeval current_time,
 598                                     void *pvt);
 599
 600 static bool spoolssd_setup_children_monitor(struct tevent_context *ev_ctx,
 601                                             struct prefork_pool *pfp)
 602 {
 603         bool ok;
 604
 605         ok = spoolssd_setup_sig_chld_handler(ev_ctx, pfp);
 606         if (!ok) {
 607                 return false;
 608         }
 609
 610         ok = spoolssd_schedule_check(ev_ctx, pfp, tevent_timeval_current());
 611         return ok;
 612 }
 613
 614 static bool spoolssd_schedule_check(struct tevent_context *ev_ctx,
 615                                     struct prefork_pool *pfp,
 616                                     struct timeval current_time)
 617 {
 618         struct tevent_timer *te;
 619         struct timeval next_event;
 620
 621         /* check situation again in 10 seconds */
 622         next_event = tevent_timeval_current_ofs(10, 0);
 623
 624         /* TODO: check when the socket becomes readable, so that children
 625          * are checked only when there is some activity ? */
 626         te = tevent_add_timer(ev_ctx, pfp, next_event,
 627                                 spoolssd_check_children, pfp);
 628         if (!te) {
 629                 DEBUG(2, ("Failed to set up children monitoring!\n"));
 630                 return false;
 631         }
 632
 633         return true;
 634 }
 635
 636 static void spoolssd_check_children(struct tevent_context *ev_ctx,
 637                                     struct tevent_timer *te,
 638                                     struct timeval current_time,
 639                                     void *pvt)
 640 {
 641         struct prefork_pool *pfp;
 642         int active, total;
 643         int ret, n;
 644
 645         pfp = talloc_get_type_abort(pvt, struct prefork_pool);
 646
 647         if ((spoolss_prefork_status & SPOOLSS_NEW_MAX) &&
 648             !(spoolss_prefork_status & SPOLLSS_ENOSPC)) {
 649                 ret = prefork_expand_pool(pfp, spoolss_max_children);
 650                 if (ret == ENOSPC) {
 651                         spoolss_prefork_status |= SPOLLSS_ENOSPC;
 652                 }
 653                 spoolss_prefork_status &= ~SPOOLSS_NEW_MAX;
 654         }
 655
 656         active = prefork_count_active_children(pfp, &total);
 657
 658         if (total - active < spoolss_spawn_rate) {
 659                 n = prefork_add_children(ev_ctx, pfp, spoolss_spawn_rate);
 660                 if (n < spoolss_spawn_rate) {
 661                         DEBUG(10, ("Tried to start 5 children but only,"
 662                                    "%d were actually started.!\n", n));
 663                 }
 664         }
 665
 666         if (total - active > spoolss_min_children) {
 667                 if ((total - spoolss_min_children) >= spoolss_spawn_rate) {
 668                         prefork_retire_children(pfp, spoolss_spawn_rate,
 669                                                 time(NULL) - SPOOLSS_MIN_LIFE);
 670                 }
 671         }
 672
 673         ret = spoolssd_schedule_check(ev_ctx, pfp, current_time);
 674 }
 675
 676 static void print_queue_forward(struct messaging_context *msg,
 677                                 void *private_data,
 678                                 uint32_t msg_type,
 679                                 struct server_id server_id,
 680                                 DATA_BLOB *data)
 681 {
 682         messaging_send_buf(msg, pid_to_procid(background_lpq_updater_pid),
 683                            MSG_PRINTER_UPDATE, data->data, data->length);
 684 }
 685
 686 pid_t start_spoolssd(struct tevent_context *ev_ctx,
 687                     struct messaging_context *msg_ctx)
 688 {
 689         struct prefork_pool *pool;
 690         struct rpc_srv_callbacks spoolss_cb;
 691         struct dcerpc_binding_vector *v;
 692         TALLOC_CTX *mem_ctx;
 693         pid_t pid;
 694         NTSTATUS status;
 695         int listen_fd;
 696         int ret;
 697         bool ok;
 698
 699         DEBUG(1, ("Forking SPOOLSS Daemon\n"));
 700
 701         pid = sys_fork();
 702
 703         if (pid == -1) {
 704                 DEBUG(0, ("Failed to fork SPOOLSS [%s]\n",
 705                            strerror(errno)));
 706         }
 707         if (pid != 0) {
 708                 /* parent or error */
 709                 return pid;
 710         }
 711
 712         /* child */
 713         close_low_fds(false);
 714
 715         status = reinit_after_fork(msg_ctx,
 716                                    ev_ctx,
 717                                    procid_self(), true);
 718         if (!NT_STATUS_IS_OK(status)) {
 719                 DEBUG(0,("reinit_after_fork() failed\n"));
 720                 smb_panic("reinit_after_fork() failed");
 721         }
 722
 723         spoolss_reopen_logs();
 724         spoolss_prefork_config();
 725
 726         /* Publish nt printers, this requires a working winreg pipe */
 727         pcap_cache_reload(ev_ctx, msg_ctx, &reload_printers);
 728
 729         /* always start the backgroundqueue listner in spoolssd */
 730         pid = start_background_queue(ev_ctx, msg_ctx);
 731         if (pid > 0) {
 732                 background_lpq_updater_pid = pid;
 733         }
 734
 735         /* the listening fd must be created before the children are actually
 736          * forked out. */
 737         listen_fd = create_named_pipe_socket(SPOOLSS_PIPE_NAME);
 738         if (listen_fd == -1) {
 739                 exit(1);
 740         }
 741
 742         ret = listen(listen_fd, spoolss_max_children);
 743         if (ret == -1) {
 744                 DEBUG(0, ("Failed to listen on spoolss pipe - %s\n",
 745                           strerror(errno)));
 746                 exit(1);
 747         }
 748
 749
 750         /* start children before any more initialization is done */
 751         ok = prefork_create_pool(ev_ctx, ev_ctx, 1, &listen_fd,
 752                                  spoolss_min_children,
 753                                  spoolss_max_children,
 754                                  &spoolss_children_main, NULL,
 755                                  &pool);
 756
 757         spoolss_setup_sig_term_handler(ev_ctx);
 758         spoolss_setup_sig_hup_handler(ev_ctx, pool, msg_ctx);
 759
 760         if (!serverid_register(procid_self(),
 761                                 FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 762                                 |FLAG_MSG_PRINT_GENERAL)) {
 763                 exit(1);
 764         }
 765
 766         if (!locking_init()) {
 767                 exit(1);
 768         }
 769
 770         messaging_register(msg_ctx, ev_ctx,
 771                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 772         messaging_register(msg_ctx, NULL, MSG_PRINTER_UPDATE,
 773                            print_queue_forward);
 774
 775         mem_ctx = talloc_new(NULL);
 776         if (mem_ctx == NULL) {
 777                 exit(1);
 778         }
 779
 780         /*
 781          * Initialize spoolss with an init function to convert printers first.
 782          * static_init_rpc will try to initialize the spoolss server too but you
 783          * can't register it twice.
 784          */
 785         spoolss_cb.init = spoolss_init_cb;
 786         spoolss_cb.shutdown = spoolss_shutdown_cb;
 787         spoolss_cb.private_data = msg_ctx;
 788
 789         status = rpc_winreg_init(NULL);
 790         if (!NT_STATUS_IS_OK(status)) {
 791                 DEBUG(0, ("Failed to register winreg rpc inteface! (%s)\n",
 792                           nt_errstr(status)));
 793                 exit(1);
 794         }
 795
 796         status = rpc_spoolss_init(&spoolss_cb);
 797         if (!NT_STATUS_IS_OK(status)) {
 798                 DEBUG(0, ("Failed to register spoolss rpc inteface! (%s)\n",
 799                           nt_errstr(status)));
 800                 exit(1);
 801         }
 802
 803         status = dcerpc_binding_vector_new(mem_ctx, &v);
 804         if (!NT_STATUS_IS_OK(status)) {
 805                 DEBUG(0, ("Failed to create binding vector (%s)\n",
 806                           nt_errstr(status)));
 807                 exit(1);
 808         }
 809
 810         status = dcerpc_binding_vector_add_np_default(&ndr_table_spoolss, v);
 811         if (!NT_STATUS_IS_OK(status)) {
 812                 DEBUG(0, ("Failed to add np to binding vector (%s)\n",
 813                           nt_errstr(status)));
 814                 exit(1);
 815         }
 816
 817         status = rpc_ep_register(ev_ctx, msg_ctx, &ndr_table_spoolss, v);
 818         if (!NT_STATUS_IS_OK(status)) {
 819                 DEBUG(0, ("Failed to register spoolss endpoint! (%s)\n",
 820                           nt_errstr(status)));
 821                 exit(1);
 822         }
 823
 824         talloc_free(mem_ctx);
 825
 826         ok = spoolssd_setup_children_monitor(ev_ctx, pool);
 827         if (!ok) {
 828                 DEBUG(0, ("Failed to setup children monitoring!\n"));
 829                 exit(1);
 830         }
 831
 832         DEBUG(1, ("SPOOLSS Daemon Started (%d)\n", getpid()));
 833
 834         /* loop forever */
 835         ret = tevent_loop_wait(ev_ctx);
 836
 837         /* should not be reached */
 838         DEBUG(0,("background_queue: tevent_loop_wait() exited with %d - %s\n",
 839                  ret, (ret == 0) ? "out of events" : strerror(errno)));
 840         exit(1);
 841 }