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 "smbd/globals.h"
  26 #include "librpc/gen_ndr/messaging.h"
  27 #include "registry.h"
  28
  29 static_decl_rpc;
  30
  31 #ifdef WITH_DFS
  32 extern int dcelogin_atmost_once;
  33 #endif /* WITH_DFS */
  34
  35 int smbd_server_fd(void)
  36 {
  37         return server_fd;
  38 }
  39
  40 static void smbd_set_server_fd(int fd)
  41 {
  42         server_fd = fd;
  43 }
  44
  45 int get_client_fd(void)
  46 {
  47         return server_fd;
  48 }
  49
  50 struct event_context *smbd_event_context(void)
  51 {
  52         if (!smbd_event_ctx) {
  53                 smbd_event_ctx = event_context_init(talloc_autofree_context());
  54         }
  55         if (!smbd_event_ctx) {
  56                 smb_panic("Could not init smbd event context");
  57         }
  58         return smbd_event_ctx;
  59 }
  60
  61 struct messaging_context *smbd_messaging_context(void)
  62 {
  63         if (smbd_msg_ctx == NULL) {
  64                 smbd_msg_ctx = messaging_init(talloc_autofree_context(),
  65                                               procid_self(),
  66                                               smbd_event_context());
  67         }
  68         if (smbd_msg_ctx == NULL) {
  69                 DEBUG(0, ("Could not init smbd messaging context.\n"));
  70         }
  71         return smbd_msg_ctx;
  72 }
  73
  74 struct memcache *smbd_memcache(void)
  75 {
  76         if (!smbd_memcache_ctx) {
  77                 smbd_memcache_ctx = memcache_init(talloc_autofree_context(),
  78                                                   lp_max_stat_cache_size()*1024);
  79         }
  80         if (!smbd_memcache_ctx) {
  81                 smb_panic("Could not init smbd memcache");
  82         }
  83
  84         return smbd_memcache_ctx;
  85 }
  86
  87 /*******************************************************************
  88  What to do when smb.conf is updated.
  89  ********************************************************************/
  90
  91 static void smb_conf_updated(struct messaging_context *msg,
  92                              void *private_data,
  93                              uint32_t msg_type,
  94                              struct server_id server_id,
  95                              DATA_BLOB *data)
  96 {
  97         DEBUG(10,("smb_conf_updated: Got message saying smb.conf was "
  98                   "updated. Reloading.\n"));
  99         change_to_root_user();
 100         reload_services(False);
 101 }
 102
 103
 104 /*******************************************************************
 105  Delete a statcache entry.
 106  ********************************************************************/
 107
 108 static void smb_stat_cache_delete(struct messaging_context *msg,
 109                                   void *private_data,
 110                                   uint32_t msg_tnype,
 111                                   struct server_id server_id,
 112                                   DATA_BLOB *data)
 113 {
 114         const char *name = (const char *)data->data;
 115         DEBUG(10,("smb_stat_cache_delete: delete name %s\n", name));
 116         stat_cache_delete(name);
 117 }
 118
 119 /****************************************************************************
 120   Send a SIGTERM to our process group.
 121 *****************************************************************************/
 122
 123 static void  killkids(void)
 124 {
 125         if(am_parent) kill(0,SIGTERM);
 126 }
 127
 128 /****************************************************************************
 129  Process a sam sync message - not sure whether to do this here or
 130  somewhere else.
 131 ****************************************************************************/
 132
 133 static void msg_sam_sync(struct messaging_context *msg,
 134                          void *private_data,
 135                          uint32_t msg_type,
 136                          struct server_id server_id,
 137                          DATA_BLOB *data)
 138 {
 139         DEBUG(10, ("** sam sync message received, ignoring\n"));
 140 }
 141
 142 static void msg_exit_server(struct messaging_context *msg,
 143                             void *private_data,
 144                             uint32_t msg_type,
 145                             struct server_id server_id,
 146                             DATA_BLOB *data)
 147 {
 148         DEBUG(3, ("got a SHUTDOWN message\n"));
 149         exit_server_cleanly(NULL);
 150 }
 151
 152 #ifdef DEVELOPER
 153 static void msg_inject_fault(struct messaging_context *msg,
 154                              void *private_data,
 155                              uint32_t msg_type,
 156                              struct server_id src,
 157                              DATA_BLOB *data)
 158 {
 159         int sig;
 160
 161         if (data->length != sizeof(sig)) {
 162                 DEBUG(0, ("Process %s sent bogus signal injection request\n",
 163                           procid_str_static(&src)));
 164                 return;
 165         }
 166
 167         sig = *(int *)data->data;
 168         if (sig == -1) {
 169                 exit_server("internal error injected");
 170                 return;
 171         }
 172
 173 #if HAVE_STRSIGNAL
 174         DEBUG(0, ("Process %s requested injection of signal %d (%s)\n",
 175                   procid_str_static(&src), sig, strsignal(sig)));
 176 #else
 177         DEBUG(0, ("Process %s requested injection of signal %d\n",
 178                   procid_str_static(&src), sig));
 179 #endif
 180
 181         kill(sys_getpid(), sig);
 182 }
 183 #endif /* DEVELOPER */
 184
 185 /*
 186  * Parent smbd process sets its own debug level first and then
 187  * sends a message to all the smbd children to adjust their debug
 188  * level to that of the parent.
 189  */
 190
 191 static void smbd_msg_debug(struct messaging_context *msg_ctx,
 192                            void *private_data,
 193                            uint32_t msg_type,
 194                            struct server_id server_id,
 195                            DATA_BLOB *data)
 196 {
 197         struct child_pid *child;
 198
 199         debug_message(msg_ctx, private_data, MSG_DEBUG, server_id, data);
 200
 201         for (child = children; child != NULL; child = child->next) {
 202                 messaging_send_buf(msg_ctx, pid_to_procid(child->pid),
 203                                    MSG_DEBUG,
 204                                    data->data,
 205                                    strlen((char *) data->data) + 1);
 206         }
 207 }
 208
 209 static void add_child_pid(pid_t pid)
 210 {
 211         struct child_pid *child;
 212
 213         child = SMB_MALLOC_P(struct child_pid);
 214         if (child == NULL) {
 215                 DEBUG(0, ("Could not add child struct -- malloc failed\n"));
 216                 return;
 217         }
 218         child->pid = pid;
 219         DLIST_ADD(children, child);
 220         num_children += 1;
 221 }
 222
 223 /*
 224   at most every smbd:cleanuptime seconds (default 20), we scan the BRL
 225   and locking database for entries to cleanup. As a side effect this
 226   also cleans up dead entries in the connections database (due to the
 227   traversal in message_send_all()
 228
 229   Using a timer for this prevents a flood of traversals when a large
 230   number of clients disconnect at the same time (perhaps due to a
 231   network outage).
 232 */
 233
 234 static void cleanup_timeout_fn(struct event_context *event_ctx,
 235                                 struct timed_event *te,
 236                                 struct timeval now,
 237                                 void *private_data)
 238 {
 239         struct timed_event **cleanup_te = (struct timed_event **)private_data;
 240
 241         DEBUG(1,("Cleaning up brl and lock database after unclean shutdown\n"));
 242         message_send_all(smbd_messaging_context(), MSG_SMB_UNLOCK, NULL, 0, NULL);
 243         messaging_send_buf(smbd_messaging_context(), procid_self(),
 244                                 MSG_SMB_BRL_VALIDATE, NULL, 0);
 245         /* mark the cleanup as having been done */
 246         (*cleanup_te) = NULL;
 247 }
 248
 249 static void remove_child_pid(pid_t pid, bool unclean_shutdown)
 250 {
 251         struct child_pid *child;
 252         static struct timed_event *cleanup_te;
 253         struct server_id child_id;
 254
 255         if (unclean_shutdown) {
 256                 /* a child terminated uncleanly so tickle all
 257                    processes to see if they can grab any of the
 258                    pending locks
 259                 */
 260                 DEBUG(3,(__location__ " Unclean shutdown of pid %u\n",
 261                         (unsigned int)pid));
 262                 if (!cleanup_te) {
 263                         /* call the cleanup timer, but not too often */
 264                         int cleanup_time = lp_parm_int(-1, "smbd", "cleanuptime", 20);
 265                         cleanup_te = event_add_timed(smbd_event_context(), NULL,
 266                                                 timeval_current_ofs(cleanup_time, 0),
 267                                                 cleanup_timeout_fn,
 268                                                 &cleanup_te);
 269                         DEBUG(1,("Scheduled cleanup of brl and lock database after unclean shutdown\n"));
 270                 }
 271         }
 272
 273         child_id = procid_self(); /* Just initialize pid and potentially vnn */
 274         child_id.pid = pid;
 275
 276         if (!serverid_deregister(&child_id)) {
 277                 DEBUG(1, ("Could not remove pid %d from serverid.tdb\n",
 278                           (int)pid));
 279         }
 280
 281         for (child = children; child != NULL; child = child->next) {
 282                 if (child->pid == pid) {
 283                         struct child_pid *tmp = child;
 284                         DLIST_REMOVE(children, child);
 285                         SAFE_FREE(tmp);
 286                         num_children -= 1;
 287                         return;
 288                 }
 289         }
 290
 291         DEBUG(0, ("Could not find child %d -- ignoring\n", (int)pid));
 292 }
 293
 294 /****************************************************************************
 295  Have we reached the process limit ?
 296 ****************************************************************************/
 297
 298 static bool allowable_number_of_smbd_processes(void)
 299 {
 300         int max_processes = lp_max_smbd_processes();
 301
 302         if (!max_processes)
 303                 return True;
 304
 305         return num_children < max_processes;
 306 }
 307
 308 static void smbd_sig_chld_handler(struct tevent_context *ev,
 309                                   struct tevent_signal *se,
 310                                   int signum,
 311                                   int count,
 312                                   void *siginfo,
 313                                   void *private_data)
 314 {
 315         pid_t pid;
 316         int status;
 317
 318         while ((pid = sys_waitpid(-1, &status, WNOHANG)) > 0) {
 319                 bool unclean_shutdown = False;
 320
 321                 /* If the child terminated normally, assume
 322                    it was an unclean shutdown unless the
 323                    status is 0
 324                 */
 325                 if (WIFEXITED(status)) {
 326                         unclean_shutdown = WEXITSTATUS(status);
 327                 }
 328                 /* If the child terminated due to a signal
 329                    we always assume it was unclean.
 330                 */
 331                 if (WIFSIGNALED(status)) {
 332                         unclean_shutdown = True;
 333                 }
 334                 remove_child_pid(pid, unclean_shutdown);
 335         }
 336 }
 337
 338 static void smbd_setup_sig_chld_handler(void)
 339 {
 340         struct tevent_signal *se;
 341
 342         se = tevent_add_signal(smbd_event_context(),
 343                                smbd_event_context(),
 344                                SIGCHLD, 0,
 345                                smbd_sig_chld_handler,
 346                                NULL);
 347         if (!se) {
 348                 exit_server("failed to setup SIGCHLD handler");
 349         }
 350 }
 351
 352 struct smbd_open_socket;
 353
 354 struct smbd_parent_context {
 355         bool interactive;
 356
 357         /* the list of listening sockets */
 358         struct smbd_open_socket *sockets;
 359 };
 360
 361 struct smbd_open_socket {
 362         struct smbd_open_socket *prev, *next;
 363         struct smbd_parent_context *parent;
 364         int fd;
 365         struct tevent_fd *fde;
 366 };
 367
 368 static void smbd_open_socket_close_fn(struct tevent_context *ev,
 369                                       struct tevent_fd *fde,
 370                                       int fd,
 371                                       void *private_data)
 372 {
 373         /* this might be the socket_wrapper swrap_close() */
 374         close(fd);
 375 }
 376
 377 static void smbd_accept_connection(struct tevent_context *ev,
 378                                    struct tevent_fd *fde,
 379                                    uint16_t flags,
 380                                    void *private_data)
 381 {
 382         struct smbd_open_socket *s = talloc_get_type_abort(private_data,
 383                                      struct smbd_open_socket);
 384         struct sockaddr_storage addr;
 385         socklen_t in_addrlen = sizeof(addr);
 386         pid_t pid = 0;
 387         uint64_t unique_id;
 388
 389         smbd_set_server_fd(accept(s->fd,(struct sockaddr *)&addr,&in_addrlen));
 390
 391         if (smbd_server_fd() == -1 && errno == EINTR)
 392                 return;
 393
 394         if (smbd_server_fd() == -1) {
 395                 DEBUG(0,("open_sockets_smbd: accept: %s\n",
 396                          strerror(errno)));
 397                 return;
 398         }
 399
 400         if (s->parent->interactive) {
 401                 smbd_process();
 402                 exit_server_cleanly("end of interactive mode");
 403                 return;
 404         }
 405
 406         if (!allowable_number_of_smbd_processes()) {
 407                 close(smbd_server_fd());
 408                 smbd_set_server_fd(-1);
 409                 return;
 410         }
 411
 412         /*
 413          * Generate a unique id in the parent process so that we use
 414          * the global random state in the parent.
 415          */
 416         generate_random_buffer((uint8_t *)&unique_id, sizeof(unique_id));
 417
 418         pid = sys_fork();
 419         if (pid == 0) {
 420                 NTSTATUS status = NT_STATUS_OK;
 421
 422                 /* Child code ... */
 423                 am_parent = 0;
 424
 425                 set_my_unique_id(unique_id);
 426
 427                 /* Stop zombies, the parent explicitly handles
 428                  * them, counting worker smbds. */
 429                 CatchChild();
 430
 431                 /* close our standard file
 432                    descriptors */
 433                 close_low_fds(False);
 434
 435                 /*
 436                  * Can't use TALLOC_FREE here. Nulling out the argument to it
 437                  * would overwrite memory we've just freed.
 438                  */
 439                 talloc_free(s->parent);
 440                 s = NULL;
 441
 442                 status = reinit_after_fork(smbd_messaging_context(),
 443                                            smbd_event_context(), true);
 444                 if (!NT_STATUS_IS_OK(status)) {
 445                         if (NT_STATUS_EQUAL(status,
 446                                             NT_STATUS_TOO_MANY_OPENED_FILES)) {
 447                                 DEBUG(0,("child process cannot initialize "
 448                                          "because too many files are open\n"));
 449                                 goto exit;
 450                         }
 451                         DEBUG(0,("reinit_after_fork() failed\n"));
 452                         smb_panic("reinit_after_fork() failed");
 453                 }
 454
 455                 smbd_setup_sig_term_handler();
 456                 smbd_setup_sig_hup_handler();
 457
 458                 if (!serverid_register_self(FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 459                                             |FLAG_MSG_DBWRAP
 460                                             |FLAG_MSG_PRINT_GENERAL)) {
 461                         exit_server_cleanly("Could not register myself in "
 462                                             "serverid.tdb");
 463                 }
 464
 465                 smbd_process();
 466          exit:
 467                 exit_server_cleanly("end of child");
 468                 return;
 469         } else if (pid < 0) {
 470                 DEBUG(0,("smbd_accept_connection: sys_fork() failed: %s\n",
 471                          strerror(errno)));
 472         }
 473
 474         /* The parent doesn't need this socket */
 475         close(smbd_server_fd());
 476
 477         /* Sun May 6 18:56:14 2001 ackley@cs.unm.edu:
 478                 Clear the closed fd info out of server_fd --
 479                 and more importantly, out of client_fd in
 480                 util_sock.c, to avoid a possible
 481                 getpeername failure if we reopen the logs
 482                 and use %I in the filename.
 483         */
 484
 485         smbd_set_server_fd(-1);
 486
 487         if (pid != 0) {
 488                 add_child_pid(pid);
 489         }
 490
 491         /* Force parent to check log size after
 492          * spawning child.  Fix from
 493          * klausr@ITAP.Physik.Uni-Stuttgart.De.  The
 494          * parent smbd will log to logserver.smb.  It
 495          * writes only two messages for each child
 496          * started/finished. But each child writes,
 497          * say, 50 messages also in logserver.smb,
 498          * begining with the debug_count of the
 499          * parent, before the child opens its own log
 500          * file logserver.client. In a worst case
 501          * scenario the size of logserver.smb would be
 502          * checked after about 50*50=2500 messages
 503          * (ca. 100kb).
 504          * */
 505         force_check_log_size();
 506 }
 507
 508 static bool smbd_open_one_socket(struct smbd_parent_context *parent,
 509                                  const struct sockaddr_storage *ifss,
 510                                  uint16_t port)
 511 {
 512         struct smbd_open_socket *s;
 513
 514         s = talloc(parent, struct smbd_open_socket);
 515         if (!s) {
 516                 return false;
 517         }
 518
 519         s->parent = parent;
 520         s->fd = open_socket_in(SOCK_STREAM,
 521                                port,
 522                                parent->sockets == NULL ? 0 : 2,
 523                                ifss,
 524                                true);
 525         if (s->fd == -1) {
 526                 DEBUG(0,("smbd_open_once_socket: open_socket_in: "
 527                         "%s\n", strerror(errno)));
 528                 TALLOC_FREE(s);
 529                 /*
 530                  * We ignore an error here, as we've done before
 531                  */
 532                 return true;
 533         }
 534
 535         /* ready to listen */
 536         set_socket_options(s->fd, "SO_KEEPALIVE");
 537         set_socket_options(s->fd, lp_socket_options());
 538
 539         /* Set server socket to
 540          * non-blocking for the accept. */
 541         set_blocking(s->fd, False);
 542
 543         if (listen(s->fd, SMBD_LISTEN_BACKLOG) == -1) {
 544                 DEBUG(0,("open_sockets_smbd: listen: "
 545                         "%s\n", strerror(errno)));
 546                         close(s->fd);
 547                 TALLOC_FREE(s);
 548                 return false;
 549         }
 550
 551         s->fde = tevent_add_fd(smbd_event_context(),
 552                                s,
 553                                s->fd, TEVENT_FD_READ,
 554                                smbd_accept_connection,
 555                                s);
 556         if (!s->fde) {
 557                 DEBUG(0,("open_sockets_smbd: "
 558                          "tevent_add_fd: %s\n",
 559                          strerror(errno)));
 560                 close(s->fd);
 561                 TALLOC_FREE(s);
 562                 return false;
 563         }
 564         tevent_fd_set_close_fn(s->fde, smbd_open_socket_close_fn);
 565
 566         DLIST_ADD_END(parent->sockets, s, struct smbd_open_socket *);
 567
 568         return true;
 569 }
 570
 571 /****************************************************************************
 572  Open the socket communication.
 573 ****************************************************************************/
 574
 575 static bool open_sockets_smbd(struct smbd_parent_context *parent,
 576                               const char *smb_ports)
 577 {
 578         int num_interfaces = iface_count();
 579         int i;
 580         char *ports;
 581         unsigned dns_port = 0;
 582
 583 #ifdef HAVE_ATEXIT
 584         atexit(killkids);
 585 #endif
 586
 587         /* Stop zombies */
 588         smbd_setup_sig_chld_handler();
 589
 590         /* use a reasonable default set of ports - listing on 445 and 139 */
 591         if (!smb_ports) {
 592                 ports = lp_smb_ports();
 593                 if (!ports || !*ports) {
 594                         ports = talloc_strdup(talloc_tos(), SMB_PORTS);
 595                 } else {
 596                         ports = talloc_strdup(talloc_tos(), ports);
 597                 }
 598         } else {
 599                 ports = talloc_strdup(talloc_tos(), smb_ports);
 600         }
 601
 602         if (lp_interfaces() && lp_bind_interfaces_only()) {
 603                 /* We have been given an interfaces line, and been
 604                    told to only bind to those interfaces. Create a
 605                    socket per interface and bind to only these.
 606                 */
 607
 608                 /* Now open a listen socket for each of the
 609                    interfaces. */
 610                 for(i = 0; i < num_interfaces; i++) {
 611                         const struct sockaddr_storage *ifss =
 612                                         iface_n_sockaddr_storage(i);
 613                         char *tok;
 614                         const char *ptr;
 615
 616                         if (ifss == NULL) {
 617                                 DEBUG(0,("open_sockets_smbd: "
 618                                         "interface %d has NULL IP address !\n",
 619                                         i));
 620                                 continue;
 621                         }
 622
 623                         for (ptr=ports;
 624                              next_token_talloc(talloc_tos(),&ptr, &tok, " \t,");) {
 625                                 unsigned port = atoi(tok);
 626                                 if (port == 0 || port > 0xffff) {
 627                                         continue;
 628                                 }
 629
 630                                 if (!smbd_open_one_socket(parent, ifss, port)) {
 631                                         return false;
 632                                 }
 633                         }
 634                 }
 635         } else {
 636                 /* Just bind to 0.0.0.0 - accept connections
 637                    from anywhere. */
 638
 639                 char *tok;
 640                 const char *ptr;
 641                 const char *sock_addr = lp_socket_address();
 642                 char *sock_tok;
 643                 const char *sock_ptr;
 644
 645                 if (strequal(sock_addr, "0.0.0.0") ||
 646                     strequal(sock_addr, "::")) {
 647 #if HAVE_IPV6
 648                         sock_addr = "::,0.0.0.0";
 649 #else
 650                         sock_addr = "0.0.0.0";
 651 #endif
 652                 }
 653
 654                 for (sock_ptr=sock_addr;
 655                      next_token_talloc(talloc_tos(), &sock_ptr, &sock_tok, " \t,"); ) {
 656                         for (ptr=ports; next_token_talloc(talloc_tos(), &ptr, &tok, " \t,"); ) {
 657                                 struct sockaddr_storage ss;
 658
 659                                 unsigned port = atoi(tok);
 660                                 if (port == 0 || port > 0xffff) {
 661                                         continue;
 662                                 }
 663
 664                                 /* Keep the first port for mDNS service
 665                                  * registration.
 666                                  */
 667                                 if (dns_port == 0) {
 668                                         dns_port = port;
 669                                 }
 670
 671                                 /* open an incoming socket */
 672                                 if (!interpret_string_addr(&ss, sock_tok,
 673                                                 AI_NUMERICHOST|AI_PASSIVE)) {
 674                                         continue;
 675                                 }
 676
 677                                 if (!smbd_open_one_socket(parent, &ss, port)) {
 678                                         return false;
 679                                 }
 680                         }
 681                 }
 682         }
 683
 684         if (parent->sockets == NULL) {
 685                 DEBUG(0,("open_sockets_smbd: No "
 686                         "sockets available to bind to.\n"));
 687                 return false;
 688         }
 689
 690         /* Setup the main smbd so that we can get messages. Note that
 691            do this after starting listening. This is needed as when in
 692            clustered mode, ctdb won't allow us to start doing database
 693            operations until it has gone thru a full startup, which
 694            includes checking to see that smbd is listening. */
 695
 696         if (!serverid_register_self(FLAG_MSG_GENERAL|FLAG_MSG_SMBD
 697                                     |FLAG_MSG_DBWRAP)) {
 698                 DEBUG(0, ("open_sockets_smbd: Failed to register "
 699                           "myself in serverid.tdb\n"));
 700                 return false;
 701         }
 702
 703         /* Listen to messages */
 704
 705         messaging_register(smbd_messaging_context(), NULL,
 706                            MSG_SMB_SAM_SYNC, msg_sam_sync);
 707         messaging_register(smbd_messaging_context(), NULL,
 708                            MSG_SHUTDOWN, msg_exit_server);
 709         messaging_register(smbd_messaging_context(), NULL,
 710                            MSG_SMB_FILE_RENAME, msg_file_was_renamed);
 711         messaging_register(smbd_messaging_context(), NULL,
 712                            MSG_SMB_CONF_UPDATED, smb_conf_updated);
 713         messaging_register(smbd_messaging_context(), NULL,
 714                            MSG_SMB_STAT_CACHE_DELETE, smb_stat_cache_delete);
 715         messaging_register(smbd_messaging_context(), NULL,
 716                            MSG_DEBUG, smbd_msg_debug);
 717         brl_register_msgs(smbd_messaging_context());
 718
 719 #ifdef CLUSTER_SUPPORT
 720         if (lp_clustering()) {
 721                 ctdbd_register_reconfigure(messaging_ctdbd_connection());
 722         }
 723 #endif
 724
 725 #ifdef DEVELOPER
 726         messaging_register(smbd_messaging_context(), NULL,
 727                            MSG_SMB_INJECT_FAULT, msg_inject_fault);
 728 #endif
 729
 730         if (dns_port != 0) {
 731 #ifdef WITH_DNSSD_SUPPORT
 732                 smbd_setup_mdns_registration(smbd_event_context(),
 733                                              parent, dns_port);
 734 #endif
 735 #ifdef WITH_AVAHI_SUPPORT
 736                 void *avahi_conn;
 737
 738                 avahi_conn = avahi_start_register(
 739                         smbd_event_context(), smbd_event_context(), dns_port);
 740                 if (avahi_conn == NULL) {
 741                         DEBUG(10, ("avahi_start_register failed\n"));
 742                 }
 743 #endif
 744         }
 745
 746         return true;
 747 }
 748
 749 static void smbd_parent_loop(struct smbd_parent_context *parent)
 750 {
 751         /* now accept incoming connections - forking a new process
 752            for each incoming connection */
 753         DEBUG(2,("waiting for connections\n"));
 754         while (1) {
 755                 int ret;
 756                 TALLOC_CTX *frame = talloc_stackframe();
 757
 758                 ret = tevent_loop_once(smbd_event_context());
 759                 if (ret != 0) {
 760                         exit_server_cleanly("tevent_loop_once() error");
 761                 }
 762
 763                 TALLOC_FREE(frame);
 764         } /* end while 1 */
 765
 766 /* NOTREACHED   return True; */
 767 }
 768
 769 /****************************************************************************
 770  Reload printers
 771 **************************************************************************/
 772 void reload_printers(void)
 773 {
 774         int snum;
 775         int n_services = lp_numservices();
 776         int pnum = lp_servicenumber(PRINTERS_NAME);
 777         const char *pname;
 778
 779         pcap_cache_reload();
 780
 781         /* remove stale printers */
 782         for (snum = 0; snum < n_services; snum++) {
 783                 /* avoid removing PRINTERS_NAME or non-autoloaded printers */
 784                 if (snum == pnum || !(lp_snum_ok(snum) && lp_print_ok(snum) &&
 785                                       lp_autoloaded(snum)))
 786                         continue;
 787
 788                 pname = lp_printername(snum);
 789                 if (!pcap_printername_ok(pname)) {
 790                         DEBUG(3, ("removing stale printer %s\n", pname));
 791
 792                         if (is_printer_published(NULL, snum, NULL))
 793                                 nt_printer_publish(NULL, snum, DSPRINT_UNPUBLISH);
 794                         del_a_printer(pname);
 795                         lp_killservice(snum);
 796                 }
 797         }
 798
 799         load_printers();
 800 }
 801
 802 /****************************************************************************
 803  Reload the services file.
 804 **************************************************************************/
 805
 806 bool reload_services(bool test)
 807 {
 808         bool ret;
 809
 810         if (lp_loaded()) {
 811                 char *fname = lp_configfile();
 812                 if (file_exist(fname) &&
 813                     !strcsequal(fname, get_dyn_CONFIGFILE())) {
 814                         set_dyn_CONFIGFILE(fname);
 815                         test = False;
 816                 }
 817         }
 818
 819         reopen_logs();
 820
 821         if (test && !lp_file_list_changed())
 822                 return(True);
 823
 824         lp_killunused(conn_snum_used);
 825
 826         ret = lp_load(get_dyn_CONFIGFILE(), False, False, True, True);
 827
 828         reload_printers();
 829
 830         /* perhaps the config filename is now set */
 831         if (!test)
 832                 reload_services(True);
 833
 834         reopen_logs();
 835
 836         load_interfaces();
 837
 838         if (smbd_server_fd() != -1) {
 839                 set_socket_options(smbd_server_fd(),"SO_KEEPALIVE");
 840                 set_socket_options(smbd_server_fd(), lp_socket_options());
 841         }
 842
 843         mangle_reset_cache();
 844         reset_stat_cache();
 845
 846         /* this forces service parameters to be flushed */
 847         set_current_service(NULL,0,True);
 848
 849         return(ret);
 850 }
 851
 852 static struct files_struct *log_writeable_file_fn(
 853         struct files_struct *fsp, void *private_data)
 854 {
 855         bool *found = (bool *)private_data;
 856         char *path;
 857
 858         if (!fsp->can_write) {
 859                 return NULL;
 860         }
 861         if (!(*found)) {
 862                 DEBUG(0, ("Writable files open at exit:\n"));
 863                 *found = true;
 864         }
 865
 866         path = talloc_asprintf(talloc_tos(), "%s/%s", fsp->conn->connectpath,
 867                                smb_fname_str_dbg(fsp->fsp_name));
 868         if (path == NULL) {
 869                 DEBUGADD(0, ("<NOMEM>\n"));
 870         }
 871
 872         DEBUGADD(0, ("%s\n", path));
 873
 874         TALLOC_FREE(path);
 875         return NULL;
 876 }
 877
 878 /****************************************************************************
 879  Exit the server.
 880 ****************************************************************************/
 881
 882 /* Reasons for shutting down a server process. */
 883 enum server_exit_reason { SERVER_EXIT_NORMAL, SERVER_EXIT_ABNORMAL };
 884
 885 static void exit_server_common(enum server_exit_reason how,
 886         const char *const reason) _NORETURN_;
 887
 888 static void exit_server_common(enum server_exit_reason how,
 889         const char *const reason)
 890 {
 891         bool had_open_conn = false;
 892         struct smbd_server_connection *sconn = smbd_server_conn;
 893
 894         if (!exit_firsttime)
 895                 exit(0);
 896         exit_firsttime = false;
 897
 898         change_to_root_user();
 899
 900         if (sconn && sconn->smb1.negprot.auth_context) {
 901                 struct auth_context *a = sconn->smb1.negprot.auth_context;
 902                 a->free(&sconn->smb1.negprot.auth_context);
 903         }
 904
 905         if (lp_log_writeable_files_on_exit()) {
 906                 bool found = false;
 907                 files_forall(log_writeable_file_fn, &found);
 908         }
 909
 910         if (sconn) {
 911                 had_open_conn = conn_close_all(sconn);
 912                 invalidate_all_vuids(sconn);
 913         }
 914
 915         /* 3 second timeout. */
 916         print_notify_send_messages(smbd_messaging_context(), 3);
 917
 918         /* delete our entry in the serverid database. */
 919         serverid_deregister_self();
 920
 921 #ifdef WITH_DFS
 922         if (dcelogin_atmost_once) {
 923                 dfs_unlogin();
 924         }
 925 #endif
 926
 927 #ifdef USE_DMAPI
 928         /* Destroy Samba DMAPI session only if we are master smbd process */
 929         if (am_parent) {
 930                 if (!dmapi_destroy_session()) {
 931                         DEBUG(0,("Unable to close Samba DMAPI session\n"));
 932                 }
 933         }
 934 #endif
 935
 936         locking_end();
 937         printing_end();
 938
 939         /*
 940          * we need to force the order of freeing the following,
 941          * because smbd_msg_ctx is not a talloc child of smbd_server_conn.
 942          */
 943         sconn = NULL;
 944         TALLOC_FREE(smbd_server_conn);
 945         TALLOC_FREE(smbd_msg_ctx);
 946         TALLOC_FREE(smbd_event_ctx);
 947
 948         if (how != SERVER_EXIT_NORMAL) {
 949                 int oldlevel = DEBUGLEVEL;
 950
 951                 DEBUGLEVEL = 10;
 952
 953                 DEBUGSEP(0);
 954                 DEBUG(0,("Abnormal server exit: %s\n",
 955                         reason ? reason : "no explanation provided"));
 956                 DEBUGSEP(0);
 957
 958                 log_stack_trace();
 959
 960                 DEBUGLEVEL = oldlevel;
 961                 dump_core();
 962
 963         } else {
 964                 DEBUG(3,("Server exit (%s)\n",
 965                         (reason ? reason : "normal exit")));
 966                 if (am_parent) {
 967                         pidfile_unlink();
 968                 }
 969                 gencache_stabilize();
 970         }
 971
 972         /* if we had any open SMB connections when we exited then we
 973            need to tell the parent smbd so that it can trigger a retry
 974            of any locks we may have been holding or open files we were
 975            blocking */
 976         if (had_open_conn) {
 977                 exit(1);
 978         } else {
 979                 exit(0);
 980         }
 981 }
 982
 983 void exit_server(const char *const explanation)
 984 {
 985         exit_server_common(SERVER_EXIT_ABNORMAL, explanation);
 986 }
 987
 988 void exit_server_cleanly(const char *const explanation)
 989 {
 990         exit_server_common(SERVER_EXIT_NORMAL, explanation);
 991 }
 992
 993 void exit_server_fault(void)
 994 {
 995         exit_server("critical server fault");
 996 }
 997
 998 /****************************************************************************
 999  Initialise connect, service and file structs.
1000 ****************************************************************************/
1001
1002 static bool init_structs(void )
1003 {
1004         /*
1005          * Set the machine NETBIOS name if not already
1006          * set from the config file.
1007          */
1008
1009         if (!init_names())
1010                 return False;
1011
1012         file_init();
1013
1014         if (!secrets_init())
1015                 return False;
1016
1017         return True;
1018 }
1019
1020 /****************************************************************************
1021  main program.
1022 ****************************************************************************/
1023
1024 /* Declare prototype for build_options() to avoid having to run it through
1025    mkproto.h.  Mixing $(builddir) and $(srcdir) source files in the current
1026    prototype generation system is too complicated. */
1027
1028 extern void build_options(bool screen);
1029
1030  int main(int argc,const char *argv[])
1031 {
1032         /* shall I run as a daemon */
1033         bool is_daemon = false;
1034         bool interactive = false;
1035         bool Fork = true;
1036         bool no_process_group = false;
1037         bool log_stdout = false;
1038         char *ports = NULL;
1039         char *profile_level = NULL;
1040         int opt;
1041         poptContext pc;
1042         bool print_build_options = False;
1043         enum {
1044                 OPT_DAEMON = 1000,
1045                 OPT_INTERACTIVE,
1046                 OPT_FORK,
1047                 OPT_NO_PROCESS_GROUP,
1048                 OPT_LOG_STDOUT
1049         };
1050         struct poptOption long_options[] = {
1051         POPT_AUTOHELP
1052         {"daemon", 'D', POPT_ARG_NONE, NULL, OPT_DAEMON, "Become a daemon (default)" },
1053         {"interactive", 'i', POPT_ARG_NONE, NULL, OPT_INTERACTIVE, "Run interactive (not a daemon)"},
1054         {"foreground", 'F', POPT_ARG_NONE, NULL, OPT_FORK, "Run daemon in foreground (for daemontools, etc.)" },
1055         {"no-process-group", '\0', POPT_ARG_NONE, NULL, OPT_NO_PROCESS_GROUP, "Don't create a new process group" },
1056         {"log-stdout", 'S', POPT_ARG_NONE, NULL, OPT_LOG_STDOUT, "Log to stdout" },
1057         {"build-options", 'b', POPT_ARG_NONE, NULL, 'b', "Print build options" },
1058         {"port", 'p', POPT_ARG_STRING, &ports, 0, "Listen on the specified ports"},
1059         {"profiling-level", 'P', POPT_ARG_STRING, &profile_level, 0, "Set profiling level","PROFILE_LEVEL"},
1060         POPT_COMMON_SAMBA
1061         POPT_COMMON_DYNCONFIG
1062         POPT_TABLEEND
1063         };
1064         struct smbd_parent_context *parent = NULL;
1065         TALLOC_CTX *frame = talloc_stackframe(); /* Setup tos. */
1066
1067         smbd_init_globals();
1068
1069         TimeInit();
1070
1071 #ifdef HAVE_SET_AUTH_PARAMETERS
1072         set_auth_parameters(argc,argv);
1073 #endif
1074
1075         pc = poptGetContext("smbd", argc, argv, long_options, 0);
1076         while((opt = poptGetNextOpt(pc)) != -1) {
1077                 switch (opt)  {
1078                 case OPT_DAEMON:
1079                         is_daemon = true;
1080                         break;
1081                 case OPT_INTERACTIVE:
1082                         interactive = true;
1083                         break;
1084                 case OPT_FORK:
1085                         Fork = false;
1086                         break;
1087                 case OPT_NO_PROCESS_GROUP:
1088                         no_process_group = true;
1089                         break;
1090                 case OPT_LOG_STDOUT:
1091                         log_stdout = true;
1092                         break;
1093                 case 'b':
1094                         print_build_options = True;
1095                         break;
1096                 default:
1097                         d_fprintf(stderr, "\nInvalid option %s: %s\n\n",
1098                                   poptBadOption(pc, 0), poptStrerror(opt));
1099                         poptPrintUsage(pc, stderr, 0);
1100                         exit(1);
1101                 }
1102         }
1103         poptFreeContext(pc);
1104
1105         if (interactive) {
1106                 Fork = False;
1107                 log_stdout = True;
1108         }
1109
1110         setup_logging(argv[0],log_stdout);
1111
1112         if (print_build_options) {
1113                 build_options(True); /* Display output to screen as well as debug */
1114                 exit(0);
1115         }
1116
1117         load_case_tables();
1118
1119 #ifdef HAVE_SETLUID
1120         /* needed for SecureWare on SCO */
1121         setluid(0);
1122 #endif
1123
1124         sec_init();
1125
1126         set_remote_machine_name("smbd", False);
1127
1128         if (interactive && (DEBUGLEVEL >= 9)) {
1129                 talloc_enable_leak_report();
1130         }
1131
1132         if (log_stdout && Fork) {
1133                 DEBUG(0,("ERROR: Can't log to stdout (-S) unless daemon is in foreground (-F) or interactive (-i)\n"));
1134                 exit(1);
1135         }
1136
1137         /* we want to re-seed early to prevent time delays causing
1138            client problems at a later date. (tridge) */
1139         generate_random_buffer(NULL, 0);
1140
1141         /* make absolutely sure we run as root - to handle cases where people
1142            are crazy enough to have it setuid */
1143
1144         gain_root_privilege();
1145         gain_root_group_privilege();
1146
1147         fault_setup((void (*)(void *))exit_server_fault);
1148         dump_core_setup("smbd");
1149
1150         /* we are never interested in SIGPIPE */
1151         BlockSignals(True,SIGPIPE);
1152
1153 #if defined(SIGFPE)
1154         /* we are never interested in SIGFPE */
1155         BlockSignals(True,SIGFPE);
1156 #endif
1157
1158 #if defined(SIGUSR2)
1159         /* We are no longer interested in USR2 */
1160         BlockSignals(True,SIGUSR2);
1161 #endif
1162
1163         /* POSIX demands that signals are inherited. If the invoking process has
1164          * these signals masked, we will have problems, as we won't recieve them. */
1165         BlockSignals(False, SIGHUP);
1166         BlockSignals(False, SIGUSR1);
1167         BlockSignals(False, SIGTERM);
1168
1169         /* Ensure we leave no zombies until we
1170          * correctly set up child handling below. */
1171
1172         CatchChild();
1173
1174         /* we want total control over the permissions on created files,
1175            so set our umask to 0 */
1176         umask(0);
1177
1178         init_sec_ctx();
1179
1180         reopen_logs();
1181
1182         DEBUG(0,("smbd version %s started.\n", samba_version_string()));
1183         DEBUGADD(0,("%s\n", COPYRIGHT_STARTUP_MESSAGE));
1184
1185         DEBUG(2,("uid=%d gid=%d euid=%d egid=%d\n",
1186                  (int)getuid(),(int)getgid(),(int)geteuid(),(int)getegid()));
1187
1188         /* Output the build options to the debug log */
1189         build_options(False);
1190
1191         if (sizeof(uint16) < 2 || sizeof(uint32) < 4) {
1192                 DEBUG(0,("ERROR: Samba is not configured correctly for the word size on your machine\n"));
1193                 exit(1);
1194         }
1195
1196         if (!lp_load_initial_only(get_dyn_CONFIGFILE())) {
1197                 DEBUG(0, ("error opening config file\n"));
1198                 exit(1);
1199         }
1200
1201         if (smbd_messaging_context() == NULL)
1202                 exit(1);
1203
1204         if (!reload_services(False))
1205                 return(-1);
1206
1207         init_structs();
1208
1209 #ifdef WITH_PROFILE
1210         if (!profile_setup(smbd_messaging_context(), False)) {
1211                 DEBUG(0,("ERROR: failed to setup profiling\n"));
1212                 return -1;
1213         }
1214         if (profile_level != NULL) {
1215                 int pl = atoi(profile_level);
1216                 struct server_id src;
1217
1218                 DEBUG(1, ("setting profiling level: %s\n",profile_level));
1219                 src.pid = getpid();
1220                 set_profile_level(pl, src);
1221         }
1222 #endif
1223
1224         DEBUG(3,( "loaded services\n"));
1225
1226         if (!is_daemon && !is_a_socket(0)) {
1227                 if (!interactive)
1228                         DEBUG(0,("standard input is not a socket, assuming -D option\n"));
1229
1230                 /*
1231                  * Setting is_daemon here prevents us from eventually calling
1232                  * the open_sockets_inetd()
1233                  */
1234
1235                 is_daemon = True;
1236         }
1237
1238         if (is_daemon && !interactive) {
1239                 DEBUG( 3, ( "Becoming a daemon.\n" ) );
1240                 become_daemon(Fork, no_process_group, log_stdout);
1241         }
1242
1243 #if HAVE_SETPGID
1244         /*
1245          * If we're interactive we want to set our own process group for
1246          * signal management.
1247          */
1248         if (interactive && !no_process_group)
1249                 setpgid( (pid_t)0, (pid_t)0);
1250 #endif
1251
1252         if (!directory_exist(lp_lockdir()))
1253                 mkdir(lp_lockdir(), 0755);
1254
1255         if (is_daemon)
1256                 pidfile_create("smbd");
1257
1258         if (!NT_STATUS_IS_OK(reinit_after_fork(smbd_messaging_context(),
1259                              smbd_event_context(), false))) {
1260                 DEBUG(0,("reinit_after_fork() failed\n"));
1261                 exit(1);
1262         }
1263
1264         smbd_setup_sig_term_handler();
1265         smbd_setup_sig_hup_handler();
1266
1267         /* Setup all the TDB's - including CLEAR_IF_FIRST tdb's. */
1268
1269         if (smbd_memcache() == NULL) {
1270                 exit(1);
1271         }
1272
1273         memcache_set_global(smbd_memcache());
1274
1275         /* Initialise the password backed before the global_sam_sid
1276            to ensure that we fetch from ldap before we make a domain sid up */
1277
1278         if(!initialize_password_db(False, smbd_event_context()))
1279                 exit(1);
1280
1281         if (!secrets_init()) {
1282                 DEBUG(0, ("ERROR: smbd can not open secrets.tdb\n"));
1283                 exit(1);
1284         }
1285
1286         if(!get_global_sam_sid()) {
1287                 DEBUG(0,("ERROR: Samba cannot create a SAM SID.\n"));
1288                 exit(1);
1289         }
1290
1291         if (!sessionid_init()) {
1292                 exit(1);
1293         }
1294
1295         if (!connections_init(True))
1296                 exit(1);
1297
1298         if (!locking_init())
1299                 exit(1);
1300
1301         if (!messaging_tdb_parent_init()) {
1302                 exit(1);
1303         }
1304
1305         if (!notify_internal_parent_init()) {
1306                 exit(1);
1307         }
1308
1309         if (!serverid_parent_init()) {
1310                 exit(1);
1311         }
1312
1313         if (!W_ERROR_IS_OK(registry_init_full()))
1314                 exit(1);
1315
1316 #if 0
1317         if (!init_svcctl_db())
1318                 exit(1);
1319 #endif
1320
1321         if (!print_backend_init(smbd_messaging_context()))
1322                 exit(1);
1323
1324         if (!init_guest_info()) {
1325                 DEBUG(0,("ERROR: failed to setup guest info.\n"));
1326                 return -1;
1327         }
1328
1329         /* Open the share_info.tdb here, so we don't have to open
1330            after the fork on every single connection.  This is a small
1331            performance improvment and reduces the total number of system
1332            fds used. */
1333         if (!share_info_db_init()) {
1334                 DEBUG(0,("ERROR: failed to load share info db.\n"));
1335                 exit(1);
1336         }
1337
1338         /* only start the background queue daemon if we are
1339            running as a daemon -- bad things will happen if
1340            smbd is launched via inetd and we fork a copy of
1341            ourselves here */
1342
1343         if (is_daemon && !interactive
1344             && lp_parm_bool(-1, "smbd", "backgroundqueue", true)) {
1345                 start_background_queue();
1346         }
1347
1348         if (!is_daemon) {
1349                 /* inetd mode */
1350                 TALLOC_FREE(frame);
1351
1352                 /* Started from inetd. fd 0 is the socket. */
1353                 /* We will abort gracefully when the client or remote system
1354                    goes away */
1355                 smbd_set_server_fd(dup(0));
1356
1357                 /* close our standard file descriptors */
1358                 close_low_fds(False); /* Don't close stderr */
1359
1360 #ifdef HAVE_ATEXIT
1361                 atexit(killkids);
1362 #endif
1363
1364                 /* Stop zombies */
1365                 smbd_setup_sig_chld_handler();
1366
1367                 smbd_process();
1368
1369                 exit_server_cleanly(NULL);
1370                 return(0);
1371         }
1372
1373         parent = talloc_zero(smbd_event_context(), struct smbd_parent_context);
1374         if (!parent) {
1375                 exit_server("talloc(struct smbd_parent_context) failed");
1376         }
1377         parent->interactive = interactive;
1378
1379         if (!open_sockets_smbd(parent, ports))
1380                 exit_server("open_sockets_smbd() failed");
1381
1382         TALLOC_FREE(frame);
1383         /* make sure we always have a valid stackframe */
1384         frame = talloc_stackframe();
1385
1386         smbd_parent_loop(parent);
1387
1388         exit_server_cleanly(NULL);
1389         TALLOC_FREE(frame);
1390         return(0);
1391 }