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