source3/smbd/server.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Main SMB server routines
   4    Copyright (C) Andrew Tridgell                1992-1998
   5    Copyright (C) Martin Pool                    2002
   6    Copyright (C) Jelmer Vernooij                2002-2003
   7    Copyright (C) Volker Lendecke                1993-2007
   8    Copyright (C) Jeremy Allison                 1993-2007
   9
  10    This program is free software; you can redistribute it and/or modify
  11    it under the terms of the GNU General Public License as published by
  12    the Free Software Foundation; either version 3 of the License, or
  13    (at your option) any later version.
  14
  15    This program is distributed in the hope that it will be useful,
  16    but WITHOUT ANY WARRANTY; without even the implied warranty of
  17    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18    GNU General Public License for more details.
  19
  20    You should have received a copy of the GNU General Public License
  21    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22 */
  23
  24 #include "includes.h"
  25 #include "popt_common.h"
  26 #include "smbd/globals.h"
  27 #include "librpc/gen_ndr/messaging.h"
  28 #include "registry.h"
  29 #include "registry/reg_init_full.h"
  30 #include "libcli/auth/schannel.h"
  31 #include "secrets.h"
  32 #include "memcache.h"
  33 #include "ctdbd_conn.h"
  34 #include "printing/printer_list.h"
  35
  36 #include "../librpc/gen_ndr/srv_dfs.h"
  37 #include "../librpc/gen_ndr/srv_dssetup.h"
  38 #include "../librpc/gen_ndr/srv_echo.h"
  39 #include "../librpc/gen_ndr/srv_eventlog.h"
  40 #include "../librpc/gen_ndr/srv_initshutdown.h"
  41 #include "../librpc/gen_ndr/srv_lsa.h"
  42 #include "../librpc/gen_ndr/srv_netlogon.h"
  43 #include "../librpc/gen_ndr/srv_ntsvcs.h"
  44 #include "../librpc/gen_ndr/srv_samr.h"
  45 #include "../librpc/gen_ndr/srv_spoolss.h"
  46 #include "../librpc/gen_ndr/srv_srvsvc.h"
  47 #include "../librpc/gen_ndr/srv_svcctl.h"
  48 #include "../librpc/gen_ndr/srv_winreg.h"
  49 #include "../librpc/gen_ndr/srv_wkssvc.h"
  50
  51 #include "printing/nt_printing_migrate.h"
  52
  53 #ifdef WITH_DFS
  54 extern int dcelogin_atmost_once;
  55 #endif /* WITH_DFS */
  56
  57 static void smbd_set_server_fd(int fd)
  58 {
  59         struct smbd_server_connection *sconn = smbd_server_conn;
  60         char addr[INET6_ADDRSTRLEN];
  61         const char *name;
  62
  63         sconn->sock = fd;
  64
  65         /*
  66          * Initialize sconn->client_id: If we can't find the client's
  67          * name, default to its address.
  68          */
  69
  70         client_addr(fd, sconn->client_id.addr, sizeof(sconn->client_id.addr));
  71
  72         name = client_name(sconn->sock);
  73         if (strcmp(name, "UNKNOWN") != 0) {
  74                 name = talloc_strdup(sconn, name);
  75         } else {
  76                 name = NULL;
  77         }
  78         sconn->client_id.name =
  79                 (name != NULL) ? name : sconn->client_id.addr;
  80
  81         sub_set_socket_ids(sconn->client_id.addr, sconn->client_id.name,
  82                            client_socket_addr(sconn->sock, addr,
  83                                               sizeof(addr)));
  84 }
  85
  86 struct event_context *smbd_event_context(void)
  87 {
  88         return server_event_context();
  89 }
  90
  91 /*******************************************************************
  92  What to do when smb.conf is updated.
  93  ********************************************************************/
  94
  95 static void smb_conf_updated(struct messaging_context *msg,
  96                              void *private_data,
  97                              uint32_t msg_type,
  98                              struct server_id server_id,
  99                              DATA_BLOB *data)
 100 {
 101         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
 102                   "updated. Reloading.\n"));
 103         change_to_root_user();
 104         reload_services(msg, smbd_server_conn->sock, False);
 105         if (am_parent) {
 106                 pcap_cache_reload(server_event_context(), msg,
 107                                   &reload_pcap_change_notify);
 108         }
 109 }
 110
 111 /*******************************************************************
 112  What to do when printcap is updated.
 113  ********************************************************************/
 114
 115 static void smb_pcap_updated(struct messaging_context *msg,
 116                              void *private_data,
 117                              uint32_t msg_type,
 118                              struct server_id server_id,
 119                              DATA_BLOB *data)
 120 {
 121         DEBUG(10,("Got message saying pcap was updated. Reloading.\n"));
 122         change_to_root_user();
 123         reload_printers(server_event_context(), msg);
 124 }
 125
 126 /*******************************************************************
 127  Delete a statcache entry.
 128  ********************************************************************/
 129
 130 static void smb_stat_cache_delete(struct messaging_context *msg,
 131                                   void *private_data,
 132                                   uint32_t msg_tnype,
 133                                   struct server_id server_id,
 134                                   DATA_BLOB *data)
 135 {
 136         const char *name = (const char *)data->data;
 137         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 138         stat_cache_delete(name);
 139 }
 140
 141 /****************************************************************************
 142   Send a SIGTERM to our process group.
 143 *****************************************************************************/
 144
 145 static void  killkids(void)
 146 {
 147         if(am_parent) kill(0,SIGTERM);
 148 }
 149
 150 /****************************************************************************
 151  Process a sam sync message - not sure whether to do this here or
 152  somewhere else.
 153 ****************************************************************************/
 154
 155 static void msg_sam_sync(struct messaging_context *msg,
 156                          void *private_data,
 157                          uint32_t msg_type,
 158                          struct server_id server_id,
 159                          DATA_BLOB *data)
 160 {
 161         DEBUG(10, ("** sam sync message received, ignoring\n"));
 162 }
 163
 164 static void msg_exit_server(struct messaging_context *msg,
 165                             void *private_data,
 166                             uint32_t msg_type,
 167                             struct server_id server_id,
 168                             DATA_BLOB *data)
 169 {
 170         DEBUG(3, ("got a SHUTDOWN message\n"));
 171         exit_server_cleanly(NULL);
 172 }
 173
 174 #ifdef DEVELOPER
 175 static void msg_inject_fault(struct messaging_context *msg,
 176                              void *private_data,
 177                              uint32_t msg_type,
 178                              struct server_id src,
 179                              DATA_BLOB *data)
 180 {
 181         int sig;
 182
 183         if (data->length != sizeof(sig)) {
 184                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 185                           procid_str_static(&src)));
 186                 return;
 187         }
 188
 189         sig = *(int *)data->data;
 190         if (sig == -1) {
 191                 exit_server("internal error injected");
 192                 return;
 193         }
 194
 195 #if HAVE_STRSIGNAL
 196         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 197                   procid_str_static(&src), sig, strsignal(sig)));
 198 #else
 199         DEBUG(0, ("Process %s requested injection of signal %d\n",
 200                   procid_str_static(&src), sig));
 201 #endif
 202
 203         kill(sys_getpid(), sig);
 204 }
 205 #endif /* DEVELOPER */
 206
 207 /*
 208  * Parent smbd process sets its own debug level first and then
 209  * sends a message to all the smbd children to adjust their debug
 210  * level to that of the parent.
 211  */
 212
 213 static void smbd_msg_debug(struct messaging_context *msg_ctx,
 214                            void *private_data,
 215                            uint32_t msg_type,
 216                            struct server_id server_id,
 217                            DATA_BLOB *data)
 218 {
 219         struct child_pid *child;
 220
 221         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 222
 223         for (child = children; child != NULL; child = child->next) {
 224                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 225                                    MSG_DEBUG,
 226                                    data->data,
 227                                    strlen((char *) data->data) + 1);
 228         }
 229 }
 230
 231 static void add_child_pid(pid_t pid)
 232 {
 233         struct child_pid *child;
 234
 235         child = SMB_MALLOC_P(struct child_pid);
 236         if (child == NULL) {
 237                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 238                 return;
 239         }
 240         child->pid = pid;
 241         DLIST_ADD(children, child);
 242         num_children += 1;
 243 }
 244
 245 /*
 246   at most every smbd:cleanuptime seconds (default 20), we scan the BRL
 247   and locking database for entries to cleanup. As a side effect this
 248   also cleans up dead entries in the connections database (due to the
 249   traversal in message_send_all()
 250
 251   Using a timer for this prevents a flood of traversals when a large
 252   number of clients disconnect at the same time (perhaps due to a
 253   network outage).
 254 */
 255
 256 static void cleanup_timeout_fn(struct event_context *event_ctx,
 257                                 struct timed_event *te,
 258                                 struct timeval now,
 259                                 void *private_data)
 260 {
 261         struct timed_event **cleanup_te = (struct timed_event **)private_data;
 262
 263         DEBUG(1,("Cleaning up brl and lock database after unclean shutdown\n"));
 264         message_send_all(smbd_messaging_context(), MSG_SMB_UNLOCK, NULL, 0, NULL);
 265         messaging_send_buf(smbd_messaging_context(), procid_self(),
 266                                 MSG_SMB_BRL_VALIDATE, NULL, 0);
 267         /* mark the cleanup as having been done */
 268         (*cleanup_te) = NULL;
 269 }
 270
 271 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
 272 {
 273         struct child_pid *child;
 274         static struct timed_event *cleanup_te;
 275         struct server_id child_id;
 276
 277         if (unclean_shutdown) {
 278                 /* a child terminated uncleanly so tickle all
 279                    processes to see if they can grab any of the
 280                    pending locks
 281                 */
 282                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
 283                         (unsigned int)pid));
 284                 if (!cleanup_te) {
 285                         /* call the cleanup timer, but not too often */
 286                         int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
 287                         cleanup_te = event_add_timed(smbd_event_context(), NULL,
 288                                                 timeval_current_ofs(cleanup_time, 0),
 289                                                 cleanup_timeout_fn,
 290                                                 &cleanup_te);
 291                         DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
 292                 }
 293         }
 294
 295         child_id = procid_self(); /* Just initialize pid and potentially vnn */
 296         child_id.pid = pid;
 297
 298         if (!serverid_deregister(child_id)) {
 299                 DEBUG(1, ("Could not remove pid %d from serverid.tdb\n",
 300                           (int)pid));
 301         }
 302
 303         for (child = children; child != NULL; child = child->next) {
 304                 if (child->pid == pid) {
 305                         struct child_pid *tmp = child;
 306                         DLIST_REMOVE(children, child);
 307                         SAFE_FREE(tmp);
 308                         num_children -= 1;
 309                         return;
 310                 }
 311         }
 312
 313         DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
 314 }
 315
 316 /****************************************************************************
 317  Have we reached the process limit ?
 318 ****************************************************************************/
 319
 320 static bool allowable_number_of_smbd_processes(void)
 321 {
 322         int max_processes = lp_max_smbd_processes();
 323
 324         if (!max_processes)
 325                 return True;
 326
 327         return num_children < max_processes;
 328 }
 329
 330 static void smbd_sig_chld_handler(struct tevent_context *ev,
 331                                   struct tevent_signal *se,
 332                                   int signum,
 333                                   int count,
 334                                   void *siginfo,
 335                                   void *private_data)
 336 {
 337         pid_t pid;
 338         int status;
 339
 340         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 341                 bool unclean_shutdown = False;
 342
 343                 /* If the child terminated normally, assume
 344                    it was an unclean shutdown unless the
 345                    status is 0
 346                 */
 347                 if (WIFEXITED(status)) {
 348                         unclean_shutdown = WEXITSTATUS(status);
 349                 }
 350                 /* If the child terminated due to a signal
 351                    we always assume it was unclean.
 352                 */
 353                 if (WIFSIGNALED(status)) {
 354                         unclean_shutdown = True;
 355                 }
 356                 remove_child_pid(pid, unclean_shutdown);
 357         }
 358 }
 359
 360 static void smbd_setup_sig_chld_handler(void)
 361 {
 362         struct tevent_signal *se;
 363
 364         se = tevent_add_signal(smbd_event_context(),
 365                                smbd_event_context(),
 366                                SIGCHLD, 0,
 367                                smbd_sig_chld_handler,
 368                                NULL);
 369         if (!se) {
 370                 exit_server("failed to setup SIGCHLD handler");
 371         }
 372 }
 373
 374 struct smbd_open_socket;
 375
 376 struct smbd_parent_context {
 377         bool interactive;
 378
 379         /* the list of listening sockets */
 380         struct smbd_open_socket *sockets;
 381 };
 382
 383 struct smbd_open_socket {
 384         struct smbd_open_socket *prev, *next;
 385         struct smbd_parent_context *parent;
 386         int fd;
 387         struct tevent_fd *fde;
 388 };
 389
 390 static void smbd_open_socket_close_fn(struct tevent_context *ev,
 391                                       struct tevent_fd *fde,
 392                                       int fd,
 393                                       void *private_data)
 394 {
 395         /* this might be the socket_wrapper swrap_close() */
 396         close(fd);
 397 }
 398
 399 static void smbd_accept_connection(struct tevent_context *ev,
 400                                    struct tevent_fd *fde,
 401                                    uint16_t flags,
 402                                    void *private_data)
 403 {
 404         struct smbd_open_socket *s = talloc_get_type_abort(private_data,
 405                                      struct smbd_open_socket);
 406         struct sockaddr_storage addr;
 407         socklen_t in_addrlen = sizeof(addr);
 408         int fd;
 409         pid_t pid = 0;
 410         uint64_t unique_id;
 411
 412         fd = accept(s->fd, (struct sockaddr *)(void *)&addr,&in_addrlen);
 413         smbd_set_server_fd(fd);
 414
 415         if (fd == -1 && errno == EINTR)
 416                 return;
 417
 418         if (fd == -1) {
 419                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 420                          strerror(errno)));
 421                 return;
 422         }
 423
 424         if (s->parent->interactive) {
 425                 smbd_process(smbd_server_conn);
 426                 exit_server_cleanly("end of interactive mode");
 427                 return;
 428         }
 429
 430         if (!allowable_number_of_smbd_processes()) {
 431                 close(fd);
 432                 smbd_set_server_fd(-1);
 433                 return;
 434         }
 435
 436         /*
 437          * Generate a unique id in the parent process so that we use
 438          * the global random state in the parent.
 439          */
 440         generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));
 441
 442         pid = sys_fork();
 443         if (pid == 0) {
 444                 NTSTATUS status = NT_STATUS_OK;
 445
 446                 /* Child code ... */
 447                 am_parent = 0;
 448
 449                 set_my_unique_id(unique_id);
 450
 451                 /* Stop zombies, the parent explicitly handles
 452                  * them, counting worker smbds. */
 453                 CatchChild();
 454
 455                 /* close our standard file
 456                    descriptors */
 457                 close_low_fds(False);
 458
 459                 /*
 460                  * Can't use TALLOC_FREE here. Nulling out the argument to it
 461                  * would overwrite memory we've just freed.
 462                  */
 463                 talloc_free(s->parent);
 464                 s = NULL;
 465
 466                 status = reinit_after_fork(smbd_messaging_context(),
 467                                            smbd_event_context(), procid_self(),
 468                                            true);
 469                 if (!NT_STATUS_IS_OK(status)) {
 470                         if (NT_STATUS_EQUAL(status,
 471                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
 472                                 DEBUG(0,("child process cannot initialize "
 473                                          "because too many files are open\n"));
 474                                 goto exit;
 475                         }
 476                         DEBUG(0,("reinit_after_fork() failed\n"));
 477                         smb_panic("reinit_after_fork() failed");
 478                 }
 479
 480                 smbd_setup_sig_term_handler();
 481                 smbd_setup_sig_hup_handler(server_event_context(),
 482                                            server_messaging_context());
 483
 484                 if (!serverid_register(procid_self(),
 485                                        FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 486                                        |FLAG_MSG_DBWRAP
 487                                        |FLAG_MSG_PRINT_GENERAL)) {
 488                         exit_server_cleanly("Could not register myself in "
 489                                             "serverid.tdb");
 490                 }
 491
 492                 smbd_process(smbd_server_conn);
 493          exit:
 494                 exit_server_cleanly("end of child");
 495                 return;
 496         }
 497
 498         if (pid < 0) {
 499                 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
 500                          strerror(errno)));
 501         }
 502
 503         /* The parent doesn't need this socket */
 504         close(fd);
 505
 506         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 507                 Clear the closed fd info out of server_fd --
 508                 and more importantly, out of client_fd in
 509                 util_sock.c, to avoid a possible
 510                 getpeername failure if we reopen the logs
 511                 and use %I in the filename.
 512         */
 513
 514         smbd_set_server_fd(-1);
 515
 516         if (pid != 0) {
 517                 add_child_pid(pid);
 518         }
 519
 520         /* Force parent to check log size after
 521          * spawning child.  Fix from
 522          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 523          * parent smbd will log to logserver.smb.  It
 524          * writes only two messages for each child
 525          * started/finished. But each child writes,
 526          * say, 50 messages also in logserver.smb,
 527          * begining with the debug_count of the
 528          * parent, before the child opens its own log
 529          * file logserver.client. In a worst case
 530          * scenario the size of logserver.smb would be
 531          * checked after about 50*50=2500 messages
 532          * (ca. 100kb).
 533          * */
 534         force_check_log_size();
 535 }
 536
 537 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
 538                                  const struct sockaddr_storage *ifss,
 539                                  uint16_t port)
 540 {
 541         struct smbd_open_socket *s;
 542
 543         s = talloc(parent, struct smbd_open_socket);
 544         if (!s) {
 545                 return false;
 546         }
 547
 548         s->parent = parent;
 549         s->fd = open_socket_in(SOCK_STREAM,
 550                                port,
 551                                parent->sockets == NULL ? 0 : 2,
 552                                ifss,
 553                                true);
 554         if (s->fd == -1) {
 555                 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
 556                         "%s\n", strerror(errno)));
 557                 TALLOC_FREE(s);
 558                 /*
 559                  * We ignore an error here, as we've done before
 560                  */
 561                 return true;
 562         }
 563
 564         /* ready to listen */
 565         set_socket_options(s->fd, "SO_KEEPALIVE");
 566         set_socket_options(s->fd, lp_socket_options());
 567
 568         /* Set server socket to
 569          * non-blocking for the accept. */
 570         set_blocking(s->fd, False);
 571
 572         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
 573                 DEBUG(0,("open_sockets_smbd: listen: "
 574                         "%s\n", strerror(errno)));
 575                         close(s->fd);
 576                 TALLOC_FREE(s);
 577                 return false;
 578         }
 579
 580         s->fde = tevent_add_fd(smbd_event_context(),
 581                                s,
 582                                s->fd, TEVENT_FD_READ,
 583                                smbd_accept_connection,
 584                                s);
 585         if (!s->fde) {
 586                 DEBUG(0,("open_sockets_smbd: "
 587                          "tevent_add_fd: %s\n",
 588                          strerror(errno)));
 589                 close(s->fd);
 590                 TALLOC_FREE(s);
 591                 return false;
 592         }
 593         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
 594
 595         DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
 596
 597         return true;
 598 }
 599
 600 static bool smbd_parent_housekeeping(const struct timeval *now, void *private_data)
 601 {
 602         time_t printcap_cache_time = (time_t)lp_printcap_cache_time();
 603         time_t t = time_mono(NULL);
 604
 605         DEBUG(5, ("parent housekeeping\n"));
 606
 607         /* if periodic printcap rescan is enabled, see if it's time to reload */
 608         if ((printcap_cache_time != 0)
 609          && (t >= (last_printer_reload_time + printcap_cache_time))) {
 610                 DEBUG( 3,( "Printcap cache time expired.\n"));
 611                 pcap_cache_reload(server_event_context(),
 612                                   smbd_messaging_context(),
 613                                   &reload_pcap_change_notify);
 614                 last_printer_reload_time = t;
 615         }
 616
 617         return true;
 618 }
 619
 620 /****************************************************************************
 621  Open the socket communication.
 622 ****************************************************************************/
 623
 624 static bool open_sockets_smbd(struct smbd_parent_context *parent,
 625                               struct messaging_context *msg_ctx,
 626                               const char *smb_ports)
 627 {
 628         int num_interfaces = iface_count();
 629         int i;
 630         char *ports;
 631         unsigned dns_port = 0;
 632
 633 #ifdef HAVE_ATEXIT
 634         atexit(killkids);
 635 #endif
 636
 637         /* Stop zombies */
 638         smbd_setup_sig_chld_handler();
 639
 640         /* use a reasonable default set of ports - listing on 445 and 139 */
 641         if (!smb_ports) {
 642                 ports = lp_smb_ports();
 643                 if (!ports || !*ports) {
 644                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
 645                 } else {
 646                         ports = talloc_strdup(talloc_tos(), ports);
 647                 }
 648         } else {
 649                 ports = talloc_strdup(talloc_tos(), smb_ports);
 650         }
 651
 652         if (lp_interfaces() && lp_bind_interfaces_only()) {
 653                 /* We have been given an interfaces line, and been
 654                    told to only bind to those interfaces. Create a
 655                    socket per interface and bind to only these.
 656                 */
 657
 658                 /* Now open a listen socket for each of the
 659                    interfaces. */
 660                 for(i = 0; i < num_interfaces; i++) {
 661                         const struct sockaddr_storage *ifss =
 662                                         iface_n_sockaddr_storage(i);
 663                         char *tok;
 664                         const char *ptr;
 665
 666                         if (ifss == NULL) {
 667                                 DEBUG(0,("open_sockets_smbd: "
 668                                         "interface %d has NULL IP address !\n",
 669                                         i));
 670                                 continue;
 671                         }
 672
 673                         for (ptr=ports;
 674                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
 675                                 unsigned port = atoi(tok);
 676                                 if (port == 0 || port > 0xffff) {
 677                                         continue;
 678                                 }
 679
 680                                 if (!smbd_open_one_socket(parent, ifss, port)) {
 681                                         return false;
 682                                 }
 683                         }
 684                 }
 685         } else {
 686                 /* Just bind to 0.0.0.0 - accept connections
 687                    from anywhere. */
 688
 689                 char *tok;
 690                 const char *ptr;
 691                 const char *sock_addr = lp_socket_address();
 692                 char *sock_tok;
 693                 const char *sock_ptr;
 694
 695                 if (strequal(sock_addr, "0.0.0.0") ||
 696                     strequal(sock_addr, "::")) {
 697 #if HAVE_IPV6
 698                         sock_addr = "::,0.0.0.0";
 699 #else
 700                         sock_addr = "0.0.0.0";
 701 #endif
 702                 }
 703
 704                 for (sock_ptr=sock_addr;
 705                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
 706                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
 707                                 struct sockaddr_storage ss;
 708
 709                                 unsigned port = atoi(tok);
 710                                 if (port == 0 || port > 0xffff) {
 711                                         continue;
 712                                 }
 713
 714                                 /* Keep the first port for mDNS service
 715                                  * registration.
 716                                  */
 717                                 if (dns_port == 0) {
 718                                         dns_port = port;
 719                                 }
 720
 721                                 /* open an incoming socket */
 722                                 if (!interpret_string_addr(&ss, sock_tok,
 723                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 724                                         continue;
 725                                 }
 726
 727                                 if (!smbd_open_one_socket(parent, &ss, port)) {
 728                                         return false;
 729                                 }
 730                         }
 731                 }
 732         }
 733
 734         if (parent->sockets == NULL) {
 735                 DEBUG(0,("open_sockets_smbd: No "
 736                         "sockets available to bind to.\n"));
 737                 return false;
 738         }
 739
 740         /* Setup the main smbd so that we can get messages. Note that
 741            do this after starting listening. This is needed as when in
 742            clustered mode, ctdb won't allow us to start doing database
 743            operations until it has gone thru a full startup, which
 744            includes checking to see that smbd is listening. */
 745
 746         if (!serverid_register(procid_self(),
 747                                FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 748                                |FLAG_MSG_DBWRAP)) {
 749                 DEBUG(0, ("open_sockets_smbd: Failed to register "
 750                           "myself in serverid.tdb\n"));
 751                 return false;
 752         }
 753
 754         if (!(event_add_idle(smbd_event_context(), NULL,
 755                              timeval_set(SMBD_HOUSEKEEPING_INTERVAL, 0),
 756                              "parent_housekeeping", smbd_parent_housekeeping,
 757                              NULL))) {
 758                 DEBUG(0, ("Could not add parent_housekeeping event\n"));
 759                 return false;
 760         }
 761
 762         /* Listen to messages */
 763
 764         messaging_register(msg_ctx, NULL, MSG_SMB_SAM_SYNC, msg_sam_sync);
 765         messaging_register(msg_ctx, NULL, MSG_SHUTDOWN, msg_exit_server);
 766         messaging_register(msg_ctx, NULL, MSG_SMB_FILE_RENAME,
 767                            msg_file_was_renamed);
 768         messaging_register(msg_ctx, NULL, MSG_SMB_CONF_UPDATED,
 769                            smb_conf_updated);
 770         messaging_register(msg_ctx, NULL, MSG_SMB_STAT_CACHE_DELETE,
 771                            smb_stat_cache_delete);
 772         messaging_register(msg_ctx, NULL, MSG_DEBUG, smbd_msg_debug);
 773         messaging_register(msg_ctx, NULL, MSG_PRINTER_PCAP, smb_pcap_updated);
 774         brl_register_msgs(msg_ctx);
 775
 776 #ifdef CLUSTER_SUPPORT
 777         if (lp_clustering()) {
 778                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 779         }
 780 #endif
 781
 782 #ifdef DEVELOPER
 783         messaging_register(msg_ctx, NULL, MSG_SMB_INJECT_FAULT,
 784                            msg_inject_fault);
 785 #endif
 786
 787         if (lp_multicast_dns_register() && (dns_port != 0)) {
 788 #ifdef WITH_DNSSD_SUPPORT
 789                 smbd_setup_mdns_registration(smbd_event_context(),
 790                                              parent, dns_port);
 791 #endif
 792 #ifdef WITH_AVAHI_SUPPORT
 793                 void *avahi_conn;
 794
 795                 avahi_conn = avahi_start_register(
 796                         smbd_event_context(), smbd_event_context(), dns_port);
 797                 if (avahi_conn == NULL) {
 798                         DEBUG(10, ("avahi_start_register failed\n"));
 799                 }
 800 #endif
 801         }
 802
 803         return true;
 804 }
 805
 806 static void smbd_parent_loop(struct smbd_parent_context *parent)
 807 {
 808         /* now accept incoming connections - forking a new process
 809            for each incoming connection */
 810         DEBUG(2,("waiting for connections\n"));
 811         while (1) {
 812                 int ret;
 813                 TALLOC_CTX *frame = talloc_stackframe();
 814
 815                 ret = tevent_loop_once(smbd_event_context());
 816                 if (ret != 0) {
 817                         exit_server_cleanly("tevent_loop_once() error");
 818                 }
 819
 820                 TALLOC_FREE(frame);
 821         } /* end while 1 */
 822
 823 /* NOTREACHED   return True; */
 824 }
 825
 826
 827 /****************************************************************************
 828  Initialise connect, service and file structs.
 829 ****************************************************************************/
 830
 831 static bool init_structs(void )
 832 {
 833         /*
 834          * Set the machine NETBIOS name if not already
 835          * set from the config file.
 836          */
 837
 838         if (!init_names())
 839                 return False;
 840
 841         if (!secrets_init())
 842                 return False;
 843
 844         return True;
 845 }
 846
 847 static bool spoolss_init_cb(void *ptr)
 848 {
 849         struct messaging_context *msg_ctx = talloc_get_type_abort(
 850                 ptr, struct messaging_context);
 851         return nt_printing_tdb_migrate(msg_ctx);
 852 }
 853
 854 static bool spoolss_shutdown_cb(void *ptr)
 855 {
 856         srv_spoolss_cleanup();
 857
 858         return true;
 859 }
 860
 861 /****************************************************************************
 862  main program.
 863 ****************************************************************************/
 864
 865 /* Declare prototype for build_options() to avoid having to run it through
 866    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
 867    prototype generation system is too complicated. */
 868
 869 extern void build_options(bool screen);
 870
 871  int main(int argc,const char *argv[])
 872 {
 873         /* shall I run as a daemon */
 874         bool is_daemon = false;
 875         bool interactive = false;
 876         bool Fork = true;
 877         bool no_process_group = false;
 878         bool log_stdout = false;
 879         char *ports = NULL;
 880         char *profile_level = NULL;
 881         int opt;
 882         poptContext pc;
 883         bool print_build_options = False;
 884         enum {
 885                 OPT_DAEMON = 1000,
 886                 OPT_INTERACTIVE,
 887                 OPT_FORK,
 888                 OPT_NO_PROCESS_GROUP,
 889                 OPT_LOG_STDOUT
 890         };
 891         struct poptOption long_options[] = {
 892         POPT_AUTOHELP
 893         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
 894         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
 895         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
 896         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
 897         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
 898         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
 899         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
 900         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
 901         POPT_COMMON_SAMBA
 902         POPT_COMMON_DYNCONFIG
 903         POPT_TABLEEND
 904         };
 905         struct smbd_parent_context *parent = NULL;
 906         TALLOC_CTX *frame;
 907         NTSTATUS status;
 908         uint64_t unique_id;
 909         struct rpc_srv_callbacks spoolss_cb;
 910
 911         /*
 912          * Do this before any other talloc operation
 913          */
 914         talloc_enable_null_tracking();
 915         frame = talloc_stackframe();
 916
 917         load_case_tables();
 918
 919         /* Initialize the event context, it will panic on error */
 920         smbd_event_context();
 921
 922         smbd_init_globals();
 923
 924         TimeInit();
 925
 926 #ifdef HAVE_SET_AUTH_PARAMETERS
 927         set_auth_parameters(argc,argv);
 928 #endif
 929
 930         pc = poptGetContext("smbd", argc, argv, long_options, 0);
 931         while((opt = poptGetNextOpt(pc)) != -1) {
 932                 switch (opt)  {
 933                 case OPT_DAEMON:
 934                         is_daemon = true;
 935                         break;
 936                 case OPT_INTERACTIVE:
 937                         interactive = true;
 938                         break;
 939                 case OPT_FORK:
 940                         Fork = false;
 941                         break;
 942                 case OPT_NO_PROCESS_GROUP:
 943                         no_process_group = true;
 944                         break;
 945                 case OPT_LOG_STDOUT:
 946                         log_stdout = true;
 947                         break;
 948                 case 'b':
 949                         print_build_options = True;
 950                         break;
 951                 default:
 952                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
 953                                   poptBadOption(pc, 0), poptStrerror(opt));
 954                         poptPrintUsage(pc, stderr, 0);
 955                         exit(1);
 956                 }
 957         }
 958         poptFreeContext(pc);
 959
 960         if (interactive) {
 961                 Fork = False;
 962                 log_stdout = True;
 963         }
 964
 965         if (log_stdout) {
 966                 setup_logging(argv[0], DEBUG_STDOUT);
 967         } else {
 968                 setup_logging(argv[0], DEBUG_FILE);
 969         }
 970
 971         if (print_build_options) {
 972                 build_options(True); /* Display output to screen as well as debug */
 973                 exit(0);
 974         }
 975
 976 #ifdef HAVE_SETLUID
 977         /* needed for SecureWare on SCO */
 978         setluid(0);
 979 #endif
 980
 981         set_remote_machine_name("smbd", False);
 982
 983         if (interactive && (DEBUGLEVEL >= 9)) {
 984                 talloc_enable_leak_report();
 985         }
 986
 987         if (log_stdout && Fork) {
 988                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
 989                 exit(1);
 990         }
 991
 992         /* we want to re-seed early to prevent time delays causing
 993            client problems at a later date. (tridge) */
 994         generate_random_buffer(NULL, 0);
 995
 996         /* get initial effective uid and gid */
 997         sec_init();
 998
 999         /* make absolutely sure we run as root - to handle cases where people
1000            are crazy enough to have it setuid */
1001         gain_root_privilege();
1002         gain_root_group_privilege();
1003
1004         fault_setup((void (*)(void *))exit_server_fault);
1005         dump_core_setup("smbd");
1006
1007         /* we are never interested in SIGPIPE */
1008         BlockSignals(True,SIGPIPE);
1009
1010 #if defined(SIGFPE)
1011         /* we are never interested in SIGFPE */
1012         BlockSignals(True,SIGFPE);
1013 #endif
1014
1015 #if defined(SIGUSR2)
1016         /* We are no longer interested in USR2 */
1017         BlockSignals(True,SIGUSR2);
1018 #endif
1019
1020         /* POSIX demands that signals are inherited. If the invoking process has
1021          * these signals masked, we will have problems, as we won't recieve them. */
1022         BlockSignals(False, SIGHUP);
1023         BlockSignals(False, SIGUSR1);
1024         BlockSignals(False, SIGTERM);
1025
1026         /* Ensure we leave no zombies until we
1027          * correctly set up child handling below. */
1028
1029         CatchChild();
1030
1031         /* we want total control over the permissions on created files,
1032            so set our umask to 0 */
1033         umask(0);
1034
1035         reopen_logs();
1036
1037         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1038         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1039
1040         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1041                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1042
1043         /* Output the build options to the debug log */
1044         build_options(False);
1045
1046         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1047                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1048                 exit(1);
1049         }
1050
1051         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1052                 DEBUG(0, ("error opening config file\n"));
1053                 exit(1);
1054         }
1055
1056         /* Init the security context and global current_user */
1057         init_sec_ctx();
1058
1059         if (smbd_messaging_context() == NULL)
1060                 exit(1);
1061
1062         /*
1063          * Reloading of the printers will not work here as we don't have a
1064          * server info and rpc services set up. It will be called later.
1065          */
1066         if (!reload_services(smbd_messaging_context(), -1, False)) {
1067                 exit(1);
1068         }
1069
1070         /* ...NOTE... Log files are working from this point! */
1071
1072         DEBUG(3,("loaded services\n"));
1073
1074         init_structs();
1075
1076 #ifdef WITH_PROFILE
1077         if (!profile_setup(smbd_messaging_context(), False)) {
1078                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1079                 return -1;
1080         }
1081         if (profile_level != NULL) {
1082                 int pl = atoi(profile_level);
1083                 struct server_id src;
1084
1085                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1086                 src.pid = getpid();
1087                 set_profile_level(pl, src);
1088         }
1089 #endif
1090
1091         if (!is_daemon && !is_a_socket(0)) {
1092                 if (!interactive)
1093                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1094
1095                 /*
1096                  * Setting is_daemon here prevents us from eventually calling
1097                  * the open_sockets_inetd()
1098                  */
1099
1100                 is_daemon = True;
1101         }
1102
1103         if (is_daemon && !interactive) {
1104                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1105                 become_daemon(Fork, no_process_group, log_stdout);
1106         }
1107
1108         generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));
1109         set_my_unique_id(unique_id);
1110
1111 #if HAVE_SETPGID
1112         /*
1113          * If we're interactive we want to set our own process group for
1114          * signal management.
1115          */
1116         if (interactive && !no_process_group)
1117                 setpgid( (pid_t)0, (pid_t)0);
1118 #endif
1119
1120         if (!directory_exist(lp_lockdir()))
1121                 mkdir(lp_lockdir(), 0755);
1122
1123         if (is_daemon)
1124                 pidfile_create("smbd");
1125
1126         status = reinit_after_fork(smbd_messaging_context(),
1127                                    smbd_event_context(),
1128                                    procid_self(), false);
1129         if (!NT_STATUS_IS_OK(status)) {
1130                 DEBUG(0,("reinit_after_fork() failed\n"));
1131                 exit(1);
1132         }
1133
1134         smbd_server_conn->msg_ctx = smbd_messaging_context();
1135
1136         smbd_setup_sig_term_handler();
1137         smbd_setup_sig_hup_handler(smbd_event_context(),
1138                                    smbd_server_conn->msg_ctx);
1139
1140         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1141
1142         if (smbd_memcache() == NULL) {
1143                 exit(1);
1144         }
1145
1146         memcache_set_global(smbd_memcache());
1147
1148         /* Initialise the password backed before the global_sam_sid
1149            to ensure that we fetch from ldap before we make a domain sid up */
1150
1151         if(!initialize_password_db(False, smbd_event_context()))
1152                 exit(1);
1153
1154         if (!secrets_init()) {
1155                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1156                 exit(1);
1157         }
1158
1159         if (lp_server_role() == ROLE_DOMAIN_BDC || lp_server_role() == ROLE_DOMAIN_PDC) {
1160                 if (!open_schannel_session_store(NULL, lp_private_dir())) {
1161                         DEBUG(0,("ERROR: Samba cannot open schannel store for secured NETLOGON operations.\n"));
1162                         exit(1);
1163                 }
1164         }
1165
1166         if(!get_global_sam_sid()) {
1167                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1168                 exit(1);
1169         }
1170
1171         if (!sessionid_init()) {
1172                 exit(1);
1173         }
1174
1175         if (!connections_init(True))
1176                 exit(1);
1177
1178         if (!locking_init())
1179                 exit(1);
1180
1181         if (!messaging_tdb_parent_init(smbd_event_context())) {
1182                 exit(1);
1183         }
1184
1185         if (!notify_internal_parent_init(smbd_event_context())) {
1186                 exit(1);
1187         }
1188
1189         if (!serverid_parent_init(smbd_event_context())) {
1190                 exit(1);
1191         }
1192
1193         if (!printer_list_parent_init()) {
1194                 exit(1);
1195         }
1196
1197         if (!W_ERROR_IS_OK(registry_init_full()))
1198                 exit(1);
1199
1200         if (!print_backend_init(smbd_messaging_context()))
1201                 exit(1);
1202
1203         /* Open the share_info.tdb here, so we don't have to open
1204            after the fork on every single connection.  This is a small
1205            performance improvment and reduces the total number of system
1206            fds used. */
1207         if (!share_info_db_init()) {
1208                 DEBUG(0,("ERROR: failed to load share info db.\n"));
1209                 exit(1);
1210         }
1211
1212         if (!init_system_info()) {
1213                 DEBUG(0,("ERROR: failed to setup system user info.\n"));
1214                 return -1;
1215         }
1216
1217         if (!init_guest_info()) {
1218                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1219                 return -1;
1220         }
1221
1222         if (!file_init(smbd_server_conn)) {
1223                 DEBUG(0, ("ERROR: file_init failed\n"));
1224                 return -1;
1225         }
1226
1227         /*
1228          * Initialize spoolss with an init function to convert printers first.
1229          * static_init_rpc will try to initialize the spoolss server too but you
1230          * can't register it twice.
1231          */
1232         spoolss_cb.init = spoolss_init_cb;
1233         spoolss_cb.shutdown = spoolss_shutdown_cb;
1234         spoolss_cb.private_data = smbd_server_conn->msg_ctx;
1235
1236         /*
1237          * TODO: Create a dependency tree, so that all services are started
1238          * in the right order.
1239          */
1240         if (!NT_STATUS_IS_OK(rpc_lsarpc_init(NULL))) {
1241                 exit(1);
1242         }
1243         if (!NT_STATUS_IS_OK(rpc_samr_init(NULL))) {
1244                 exit(1);
1245         }
1246         if (!NT_STATUS_IS_OK(rpc_netlogon_init(NULL))) {
1247                 exit(1);
1248         }
1249
1250         if (!NT_STATUS_IS_OK(rpc_winreg_init(NULL))) {
1251                 exit(1);
1252         }
1253         if (!NT_STATUS_IS_OK(rpc_srvsvc_init(NULL))) {
1254                 exit(1);
1255         }
1256
1257         if (!NT_STATUS_IS_OK(rpc_spoolss_init(&spoolss_cb))) {
1258                 exit(1);
1259         }
1260         if (!NT_STATUS_IS_OK(rpc_svcctl_init(NULL))) {
1261                 exit(1);
1262         }
1263         if (!NT_STATUS_IS_OK(rpc_ntsvcs_init(NULL))) {
1264                 exit(1);
1265         }
1266         if (!NT_STATUS_IS_OK(rpc_eventlog_init(NULL))) {
1267                 exit(1);
1268         }
1269         if (!NT_STATUS_IS_OK(rpc_initshutdown_init(NULL))) {
1270                 exit(1);
1271         }
1272         if (!NT_STATUS_IS_OK(rpc_netdfs_init(NULL))) {
1273                 exit(1);
1274         }
1275 #ifdef DEVELOPER
1276         if (!NT_STATUS_IS_OK(rpc_rpcecho_init(NULL))) {
1277                 exit(1);
1278         }
1279 #endif
1280         if (!NT_STATUS_IS_OK(rpc_dssetup_init(NULL))) {
1281                 exit(1);
1282         }
1283         if (!NT_STATUS_IS_OK(rpc_wkssvc_init(NULL))) {
1284                 exit(1);
1285         }
1286
1287         /* Publish nt printers, this requires a working winreg pipe */
1288         pcap_cache_reload(server_event_context(), smbd_messaging_context(),
1289                           &reload_printers);
1290
1291         /* only start the background queue daemon if we are
1292            running as a daemon -- bad things will happen if
1293            smbd is launched via inetd and we fork a copy of
1294            ourselves here */
1295
1296         if (is_daemon && !interactive
1297             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1298                 start_background_queue(smbd_event_context(),
1299                                        smbd_messaging_context());
1300         }
1301
1302         if (!is_daemon) {
1303                 /* inetd mode */
1304                 TALLOC_FREE(frame);
1305
1306                 /* Started from inetd. fd 0 is the socket. */
1307                 /* We will abort gracefully when the client or remote system
1308                    goes away */
1309                 smbd_set_server_fd(dup(0));
1310
1311                 /* close our standard file descriptors */
1312                 close_low_fds(False); /* Don't close stderr */
1313
1314 #ifdef HAVE_ATEXIT
1315                 atexit(killkids);
1316 #endif
1317
1318                 /* Stop zombies */
1319                 smbd_setup_sig_chld_handler();
1320
1321                 smbd_process(smbd_server_conn);
1322
1323                 exit_server_cleanly(NULL);
1324                 return(0);
1325         }
1326
1327         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1328         if (!parent) {
1329                 exit_server("talloc(struct smbd_parent_context) failed");
1330         }
1331         parent->interactive = interactive;
1332
1333         if (!open_sockets_smbd(parent, smbd_messaging_context(), ports))
1334                 exit_server("open_sockets_smbd() failed");
1335
1336         TALLOC_FREE(frame);
1337         /* make sure we always have a valid stackframe */
1338         frame = talloc_stackframe();
1339
1340         smbd_parent_loop(parent);
1341
1342         exit_server_cleanly(NULL);
1343         TALLOC_FREE(frame);
1344         return(0);
1345 }